The methods of the evaluation of the waste energy recovery systems in the marine Diesel power plants

Transcription

1 Scentfc Journals Martme Unversty of Szczecn Zeszyty Naukowe Akadema Morska w Szczecne 2012, 32(104) z. 1 pp , 32(104) z. 1 s The methods of the evaluaton of the waste energy recovery systems n the marne Desel power plants Ryszard Mchalsk West Pomeranan Unversty of Technology n Szczecn, Faculty of Martme Technology and Transport Szczecn, al. Pastów 41, e-mal: ryszard.mchalsk@zut.edu.pl Key words: marne power plants, waste energy recovery systems, energetc evaluaton, exergetc evaluaton, economc evaluaton Abstract The artcle presents the general descrpton of the waste energy recovery systems n the marne Desel power plants. Both, the smple as well as the complex recovery systems have been dscussed. The substantal part of the artcle concerns the overvew of the evaluaton methods of the recovery systems arrangements. There have been presented the rudments of the thermodynamc evaluaton whch n the effect provdes the materal for the determnaton of the energetc and exergetc effcency of the recovery systems. The sgnfcant ssue s also the descrpton of the method of the arrangements economc evaluaton, ncludng the method of the determnaton of the annual proft ensung from the operaton of the waste energy recovery system and the dynamc methods of the economc analyss wth the partcular emphass on the nvestment outlay payback perod ndex. There have been presented the examples of the dependence of the waste heat turbo-generators on the man engne power output, the estmated payback tmes of the nvestment outlays ncurred n connecton wth the dscussed systems and the payback tme of the outlays wth reference to the man engne power output n the functon of ts power output. Introducton The energetc transformatons occurrng n the marne waste energy recovery systems form the typcal assocated processes. The effectve products of those processes may consst n general: electrc energy, mechancal energy used to supplement the shp s man propulson, heat for the heatng purposes, sometmes cold temperatures and fresh water produced out of the sea water. The recovery systems are drven n the most general case by the waste energy of the fuel burnng equpment. There s a large varety of the waste energy recovery system arrangements possble for the applcaton and mplementaton. Makng the decson about the choce of the approprate arrangement s connected wth ts evaluaton, both n terms of the techncal mplementaton possbltes on the shp, as well as provson of the most favourable thermodynamc parameters and the acceptable costs. In order to make the decson concernng the method of the energy recovery t becomes necessary also to make the rght choce between the utlsaton of the conventonal energy sources and the waste energy recovery. The analyss of the functonal types of the waste energy recovery systems and ther relatons wth the conventonal energy sources provdes the vew of the possblty of substtutng the classc manner of energy generaton (thermal, electrc or mechancal energy) by a system utlsng the waste energy of the man propulson engne or engnes, or the jont operaton of ths machnery. The fnal evaluaton of the waste energy recovery system arrangements possble for the applcaton on the specfc shp should nclude the forecasted / planned operaton condtons and may be made upon the completon of the techncal- -economc analyss. General descrpton of the recovery system arrangements The dagram of the generalsed recovery system s presented n fgure 1, where the energy balance boundary has been marked for the recovery system, as well as the energy balance boundary for the 34 Scentfc Journals 32(104) z. 1

2 The methods of the evaluaton of the waste energy recovery systems n the marne Desel power plants entre energy system of the marne Desel power plant. In the majorty of the exstng marne power plants the effectve products of the recovery system are the heat whose carrer s steam, more rarely the specal heatng ols and electrc energy and the fresh water produced n the evaporators. The smplest waste energy recovery systems are the sngle- -pressure systems producng n the waste-heat bolers exclusvely the saturated steam for the heatng purposes. The drvng energy n these systems s the heat contaned n the man engne exhaust gases. The complex recovery systems cover the systems for so called complex recovery of the waste energy where not only the heat contaned n the exhaust gas s utlsed, but also the heat contaned n the engne chargng ar, engne coolng water and lubrcatng ol, as well as the ncreased exhaust gas pressure behnd the engne [1]. In these systems not only dfferent sources of waste energy are utlsed, but also the dfferent form of the waste energy. The applcaton of the recovery system arrangement depends chefly on the type of the shp (nter ala the heat and electrc energy demand), man engne power output and type. However, the most frequently used source of the drvng energy for the recovery system are the man engne exhaust gases owng to ther relatvely hgh specfc exergy and large amount of the heat carred. The applcaton of ths source s, however, related wth the problems resultng manly from the physcal- -chemcal propertes of the exhaust gas tself, as the gas contans among others the sgnfcant amounts of the sulphur oxdes lmtng the possblty of any substantal reducton of the exhaust gas temperature behnd the waste-heat boler. On the other hand, the utlsaton of the auxlary engnes exhaust gas heat can be consdered only n a lmted extent. The systems wth the waste-heat bolers appled n the power plants of the shps wth engnes of small power output are generally very smple snce the steam demand n ths case s usually small and the shps are characterstcally for the short tme perods at sea and reman for a rather long tme n ports. The amount of the saved fuel owng to the applcaton of the complex recovery system s n ths case relatvely mnor, whle the tme of payback of the nvestment outlays on the complex system s long. The addtonal problem s also the avalablty of the bgger space n the engne room as necessary to accommodate the extensve recovery system. Such problems do not occur or are much less sgnfcant on the bg shps wth spacous engne rooms ftted wth the propulson engnes of large power output. The smplest set-up of the waste-heat boler s the sngle-pressure system producng exclusvely the saturated steam. The sngle-pressure system wth the steam superheater can produce the superheated steam needed to supply the steam turbnes drvng the generators or supplementng the shp s man propulson, as well as drvng the other auxlary equpment, e.g. cargo pumps on some tankers. The applcaton of the waste-heat turbogenerators allows not only to mprove the power plant energetc effcency, because t reduces the fuel consumpton by the ndependent Desel generatng sets whle en route at sea, but also n certan cases allows to reduce the number of these generatng sets. If the waste-heat boler s extended by the addtonal economzer, then there s a possblty of ncreasng the boler capacty n relaton to the system wth the shallow exhaust gas heat recovery owng to the possblty of decreasng the exhaust gas temperature after the boler. Such system s referred to as the deep exhaust gas heat recovery system. On the shps wth the Desel engne or gas turbne propulson system, where the steam produced n the waste-heat bolers s used for the propulson of the generatng set turbnes, the changes n the shp s heatng steam recevers load are a problem, whch s translated nto the avalable amount of the turbne supply steam. In such case, there would be a justfed soluton to adopt the double-pressure waste-heat bolers. In such systems most frequently the low pressure steam s used to supply the heat recevers, whereas the superheated steam from the hgh-pressure crculaton s used exclusvely to supply the turbne. Varous arrangements of the systems are possble n such crcumstances. The acceptance of a specfc concept s subject mostly to the requred steam heatng nstallaton capacty, the requred steam pressure values, as well as the acceptable nstallaton cost. The addtonal benefts related wth the applcaton of the double-pressure systems result from the power ncrease of the appled turbo-steam power generatng sets. There s also a large varety of the recovery systems resultng from the manner of boler feed water supply. The results of the nvestgatons presented n [2] ndcate that wth the exstng varous arrangements of the waste-heat boler systems t s necessary to perform the analyss for the choce of both, the thermodynamc parameters as well as the dagram of the supply system n order to obtan the possbly cheapest and effectve soluton on a gven shp. The relatvely hgh effcency of the modern turbochargers provdes the possblty to use a part of Zeszyty Naukowe 32(104) z. 1 35

3 Ryszard Mchalsk the exhaust gas n the separate exhaust gas turbne supplementng the shp s propulson, thus creatng the hybrd propulson system or n the exhaust gas turbne drvng the generator. In these arrangements the temperature part and the pressure part of the waste energy from the engne exhaust gas are utlsed. The saturated steam generated n the waste- -heat boler supples the recevers on the shp whle at sea. Also the combned arrangements are proposed where the exhaust gas from waste-heat turbne s drected to the waste-heat boler producng, besdes the saturated steam, also the superheated steam that supples the addtonal steam turbne. Varous methods of the steam generatng can be appled n such cases, as well as varous manners of the steam turbne steam supply. The advanced solutons of the waste energy recovery systems where shaft generator has been addtonally appled wth the possblty of the operaton as the electrc motor of the auxlary functon for the shp s propulson are referred to nter ala n [3]. The thermodynamc evaluaton of the arrangements of the marne waste energy recovery systems The low exergy of the waste energy carrers n the Desel power plants has such an effect that the degree of the utlsaton of the waste energy s small, and the commonly appled recovery system arrangements are usually lmted to the utlsaton of the man engne exhaust gas heat and generaton of the steam to satsfy ether wholly or partally the heatng needs on the shp. Only n a few nstances the avalable amount of the waste energy allows addtonally to generate the mechancal energy n the gas or steam turbne, or both turbnes at a tme and use t to drve the generator or the propeller [1]. However, n each case t s sgnfcant to make the approprate choce of the parameter values n the ndvdual ponts charactersng the workng meda thermodynamc transformatons. In order to make the rght choce, t s necessary to conduct the adequate analyses whch wll enable the evaluaton of the qualty of the ndvdual process courses and ndcate the places where the major losses occur and the methods to mnmse them. The bass for the calculatons of the waste energy recovery systems n the Desel power plants are the systems of mass and energy balance equatons. Whle desgnng the dscussed systems, the enthalpy analyss has become commonly appled. To make the correct evaluaton, partcularly of the waste energy sources, the exergetc analyss s used [4, 5], whereas to evaluate the qualty of the processes occurrng durng the system operaton, the entropy analyss may be appled. The general methods of mnmsng the entropy ncreases occurrng n the heat transfer processes and n the power plants have been descrbed n [4, 6, 7]. The energetc effcency of the waste energy recovery systems The energetc effcency of the energetc system presented n fgure 1 s determned by the rato of the effectve energy E e to the energy suppled to the system E S : E e E (1) ES The energetc system effectve energy conssts of the mechancal energy used for the shp s propulson. The electrc energy and the heat transferred by the heatng meda to the varous recevers on the shp. The energetc effcency of the power plant s determned n general case by the relaton: E NS NS NelDG NelWHTG Q AB Q BMEWdME BDGWdDG BABWdAB (2) N S man propulson engne shaft power; ΔN S power of the equpment supplementng the shp s man propulson obtaned n the recovery system; N eldg electrc power measured at the Desel generatng set generator termnals; N elwhtg electrc power measured at the waste- -heat turbo-generator termnals; Q AB thermal power of the auxlary ol-fred boler; Q thermal power of the waste-heat heatng B ME B DG B AB system; man engne fuel consumpton; Desel generatng set fuel consumpton; auxlary ol-fred boler fuel consumpton; W dme lower calorfc value of the fuel burnt n man engne; W ddg lower calorfc value of the fuel burnt n the Desel engnes of the generatng sets; W dab lower calorfc value of the fuel burnt n the auxlary boler. The effcency determned accordng to the relaton (2) ncludes as the effectve energy also own needs of the energetc system tself. It s regarded 36 Scentfc Journals 32(104) z. 1

4 The methods of the evaluaton of the waste energy recovery systems n the marne Desel power plants sea water exhaust gas ar brne balance boundary of waste energy recovery system electrc energy WASTE ENERGY RECOVERY SYSTEM mechancal energy supplementng the shp s man propulson heat for heatng purposes fresh water ME/SG energy for shp s man propulson AE/SP electrc energy AB/KP heat for heatng purposes sea water fuels ar balance boundary of the shp s energetc system Fg. 1. The dagram of the energy dstrbuton for the generalsed recovery system: ME man engne, AE auxlary engnes, AB auxlary fuel-fred boler; nput products for the shp s energetc system, waste products at the recovery system nlet, effectve products, waste products at the shp s energetc system outlet as the gross effcency of the shp s energetc system and treated as the symbolc [conventonal] value. A part of the waste energy on the shp s also used to produce the fresh water out of the sea water n the evaporator. The energetc outlays ncurred for ts producton are subject to ts amount and the technology appled. The fresh water producng nstallaton s regarded as the ntegral part of the energetc system, located wthn the balance boundary. Ths means that the energy needed to drve the evaporator nstallaton pumps s not ncluded as the effectve energy, also the energy dfference occurrng between the sea water carred to the recovery system and the produced fresh water s omtted. The fresh water obtaned from the evaporator s not regarded as the effectve energy carrer. Generally, the waste energy utlsaton degree can be charactersed by the rato of the effectve energy, obtanable n the result of the recovery system applcaton, to the sum of the waste energy of the fuel burnng machnery [8]. Ths ndex, consdered as the energetc degree of the utlsaton of the waste energy n the marne power plant, can be presented n such case by means of the followng relaton: E NS N elwhtg 1 1 B W 1 B W odg DG Q ddg AB ome B AB ME W dab dme (3) η ome overall effcency of man engne; η odg overall effcency of the Desel generators; η AB effcency of the auxlary ol fred boler. The reducton of the effectve energy value by the energetc demands related wth the fresh water producton s ncluded n case when the fresh water producng nstallaton s placed wthn the balance boundary of the recovery system. In case of the partal evaluaton of the waste energy recovery degree n the recovery system only such energy fluxes are ncluded whch are subject to recovery. Thus defned ndex does not dfferentate the values of the ndvdual knds of the effectve energy, and nether ncludes the qualty of the waste energy n the marne power plant as the source of the practcal possbltes of ts recovery. Zeszyty Naukowe 32(104) z. 1 37

5 Ryszard Mchalsk The exergetc effcency of the waste energy recovery systems In order to evaluate the degree of the perfecton of the thermodynamc processes carred out n the marne recovery systems t s possble to apply the exergetc effcency of the recovery system. It can be assumed that: Generally, the propulson exergy conssts the sum of the physcal exerges of the meda actng as the Desel engne waste energy carrers, such as: exhaust gas. chargng ar, coolng water and lubrcatng ol, and n the auxlary ol-fred boler exhaust gas and the propulson work carred from outsde the system. The value of the propulson exergy s subject to reducton by ts such part whch s used for the fresh water producton n the recovery system. The effectve exergy flux conssts the power output of the turbne supplementng the man propulson N S, electrc power N elwhtg and the decrease of the heatng meda exergy flux used outsde the recovery system reduced by the values of the exergy fluxes related wth own demands of the recovery system. The dfferences of the physcal exerges of the sea water and the fresh water produced out of t wll be omtted as rrelevant. In such case the exergetc recovery degree, as the crteron of the comparatve evaluaton of the thermodynamc perfecton of the recovery systems, can be determned as: η B N S N elwhtg m n n b δb N n OD δb FWG m b g g (4) g m heatng meda mass fluxes leavng the recovery system; b g the ncrease of the specfc physcal exerges of the heatng meda; n m the mass fluxes of the meda consstng the sources of the propulson exergy for the recovery system; n b specfc physcal exerges of the meda actng as the sources of the propulson exergy; B OD the exergy flux used for recovery system own demands and the fresh water producton; B FWG the decrease of the exergy flux of the meda actng as the source of the propulson exergy related wth the fresh water producton wthn the recovery system; N n power carred to the recovery system from the outsde. The economc evaluaton of the arrangements of the waste energy recovery systems In consderaton of the large varety of the arrangements of the waste energy recovery systems applcable on the shps wth Desel propulson the decson makng as to the set-up of such a system on a specfc shp should result not only from the conducted techncal analyss, ncludng nter ala the thermodynamc, relablty or constructon analyss, but should also be preceded by the analyss of the economc nature. The mplementaton of the energy-savng arrangement s usually accompaned by the ncrease of the nvestment outlays. Ths decson should be made jontly by the shp desgner and her future owner, on the bass of the desgn assumptons taken for the specfc shp and ts operaton condtons and the establshed techncal and economc crtera [9, 10]. The well proven tool enablng to conduct the complex techncal-economc analyss s among others the mult-crteron method of the soluton evaluaton. The practcal mode of ts applcaton has been presented n [11]. The annual proft resultng from the operaton of the waste energy recovery systems One of the methods of the evaluaton of the arrangements of the waste energy recovery system can be the determnaton of the annual proft resultng from the operaton of the waste energy recovery system. Generally, the annual proft AP resultng from the applcaton / operaton of the waste energy recovery system on the shp, smlar as t s done n case of the effectveness evaluaton of e.g. waste- -heat bolers n the shore applcatons [12], can be determned from the general equaton (5): AP M M P K pr fwr WHTG PT k sp k I sfw K E WHTG WHTG S P k ss WHG P FWG K WHG FWG elwhtg FWG PT K δk E sel PT WHG PMEδIME PDGδIDG M pr the annual amount of the heatng medum used from the waste-heat boler; k sp the cost per unt of the heatng medum produced n the ndependent ol-fred boler, as the machnery replaced by the waste-heat boler; I E I P k I (5) 38 Scentfc Journals 32(104) z. 1

6 The methods of the evaluaton of the waste energy recovery systems n the marne Desel power plants E S the annual amount of energy transmtted onto man shaft by the turbne supplementng the man propulson; k ss the cost per unt of the mechancal energy produced by man engne, as the machnery replaced [supplemented] by the turbne supplementng the man propulson; E elwhtg the annual amount of the electrc energy generated by the system wth the waste- -heat turbo-generators; k sel the cost per unt of the electrc energy generated by the ndependent Desel generatng sets, as the machnery replaced by the waste-heat turbo-generators; M fwr the annual amount of the consumed fresh water produced n the vacuum evaporator; k sfw the cost per unt of the fresh water taken from the shore, as the medum replaced by the water produced n the evaporator; I WHG, I PT, I WHTG, I FWG the nvestment outlays on the waste-heat boler, man propulson supplementng turbne, waste-heat turbo- -generators and vacuum evaporator; I ME, I DG the correspondng reducton n the nvestment outlays on the purchase of the man engne and the generatng sets owng to the applcaton of the turbne supplementng the man propulson and the waste- -heat turbo-generators; P WHG, P ME, P PT, P WHTG, P FWG, P DG the annual rate of the servce of the nvestment captal related wth the waste-heat boler, man engne, turbne supplementng man propulson, waste-heat turbo-generators, vacuum evaporator and Desel generatng sets; K WHG, K PT, K WHTG, K FWG the annual operaton costs of the waste-heat boler, turbne supplementng man propulson, waste-heat turbo-generators, vacuum evaporator; K E the annual reducton of ecologcal charges, f any, owng to the utlsaton of the waste energy. The evaluaton of the economc effectveness of the waste energy recovery systems The major ndcaton as to the qualty of the arrangement of the analysed energetc systems can be the evaluaton of ther economc effectveness [13]. In case of the marne waste energy recovery systems the purpose s to apply such solutons whch would lead to mnmsng of the generaton costs of the necessary amounts of the approprate energy forms on the shp aganst economcally justfed prce. The economc effectveness n such terms jons the adequate techncal and economc crtera. In many cases, when the obtaned energy generaton level s constant (results from the adopted desgn assumptons), the analyss of the solutons s lmted to conductng the economc evaluaton exclusvely [14]. A sgnfcant ssue whle makng the economc evaluaton of the arrangement solutons s ncludng the tme factor n the form of the adequately determned dscount rate. Whle strvng to properly consder the proecologcal aspects of the adopted solutons, the attenton should be pad to accept the lower values of the dscount rates. In the models descrbng the nvestment outlays and the operaton costs ncurred, not only the costs assocated wth the executon and operaton of the waste energy recovery system tself should be ncluded, but the costs of the entre energetc system of the shp. The result of the economc analyss of the solutons of the waste energy recovery system on the shp should be the determnaton whch of them (wth the assumed / target techncal parameters) together wth the remanng elements of the shp s energetc system (the propulson system, ndependent generatng sets, ol-fred boler) meets the condton of the mnmum costs ncurred for the purchase and operaton. It could be assumed that the suffcent crteron of the economc evaluaton s the comparson of the purchase costs of the shp s energetc system and the costs of the fuels and lubols consumed throughout the entre operaton perod of the vessel. In the more profound and detaled analyses one should also take nto account among others the comprehensve costs of the system servce. The economc analyss conssts n the further stages of the evaluatons of the desgn solutons as the bass for the performance of the rsk and economc effectveness analyss [15]. On the bass of the analyss of the dynamc methods of the economc analyss conducted n [14], the most frequently appled effectveness ndces of the shppng nvestments could be dvded nto three categores: AAC Average Annual Cost; NPV Net Present Value; RPT Real Payback Tme. Consderng the fact that the energetc system, ncludng the waste energy recovery system, conssts only a component of the whole nvestment whch a shp s, as the suffcent comparatve crteron allowng to evaluate the solutons of the systems may be the average annual cost AAC, whereas the RPT ndex s the sgnfcant parameter playng a major role n the decson-makng process con- Zeszyty Naukowe 32(104) z. 1 39

7 Payback tme, years El. Power, kw Ryszard Mchalsk cernng the possble applcaton of the optmum recovery system on a specfc shp. Ths s calculated from the relaton: for q 1 for q = 1 q1 I log 1 q K RPT log q I K fo SE fo (6) SE RPT (7) S r q I SE the dfference between the nvestment outlays concernng the energetc system arrangement soluton under consderaton and the nvestment outlays concernng the cheapest system assumed as the reference bass: I I SE ME IDG ISGIWERS I (8) I I I I I ME DG SG WERS AB AB bass K po the dfference between the annual cost of the fuel and lubols for the energetc system assumed as the reference bass and the annual cost of the fuel and lubols for the system under consderaton: K fo K f Ko K f Ko bass (9) I ME nvestment outlays related wth the man engne purchase; I DG nvestment outlays related wth the purchase of the ndependent generatng sets; I SG nvestment outlays related wth the purchase of the shaft generator; I WERS nvestment outlays related wth the purchase of the waste energy recovery system; I AB nvestment outlays related wth the purchase of the auxlary boler; K f annual cost of fuels burnt n the engnes; K o annual cost of the lubols; nflaton rate (annual prce ncrease of fuel S R and ol n percent); annual dscount rate. In case of the analyss of several varants, the hgher apprecated s that where the payback tme s shorter. The assumpton of the hgh dscount rates extends the nvestment payback tme. The ndex analysed does not account for the expected benefts of the applcaton of the complex recovery systems n the form of nter ala ganng the addtonal freght or possble reducton of the ecologcal charges owng to the status of the green shp. The payback tme of the waste energy recovery systems proposed by MAN B&W Desel A/S has been the object of the analyss presented n [16]. The sngle-pressure and double-pressure systems have been consdered. Four power plants varants have been consdered: wth 6S90 ME-C engnes of 29,340 kw output, 7K98 ME-C engnes of 39,970 kw output, 12K90 ME engnes of 54,840 kw and wth 12K98 ME engnes of 68,640 kw output. The obtaned electrc power values, as the result of the operaton of the waste-heat gas turbnes and steam turbnes, conssted from 5.4 to 9.8% of the servce power output of the man engnes (85% maxmum contnuous power). Ths s shown n fgure ME Power, kw Fg. 2. The waste-heat turbo-generator power as the functon of the man engne power output [16]: GTG Gas turbo- -generator; GTG+STGSP Gas turbo-generator and steam turbo-generator n the sngle-pressure system; GTG+STGDP Gas turbo-generator and steam turbo-generator n the double- -pressure system The payback tme of the systems under consderaton does not depend on the degree of ther complexty (the sngle- or double-pressure system), but on the man engne power output. Ths tme oscllates between 5 years for the bggest of the engnes consdered and the perod of 9 years for the smallest engnes. Ths relaton between the recovery system nvestment outlays payback tme and the man engne power output s shown n fgure 3. The possble reducton of the fuel consumpton GTG GTG+STGSP GTG+STGDP Power, kw Fg. 3. The recovery system nvestment outlays payback tme as the functon of the man engne power output [16] 40 Scentfc Journals 32(104) z. 1

8 Payback tme ndex, years/kw The methods of the evaluaton of the waste energy recovery systems n the marne Desel power plants oscllates between 8 10% owng to the applcaton of the sngle-pressure systems wth the engne normal load and between 9 11% for the more complex double-pressure systems. The fgure 4 shows the ndex of the nvestment outlays payback tme as the payback tme of the outlays n reference to the man engne power output n the functon of the man engne power output. Ths ndex s more favourable for the shps equpped wth man engnes of hgh power outputs, therefore, n case of buldng of the bg shps the consderaton of the applcaton of the advanced waste energy recovery systems becomes of specal sgnfcance. 0,0007 0,0006 0,0005 0,0004 0,0003 0,0002 0, Fg. 4. The recovery system nvestment outlays payback tme ndex as the functon of the man engne power output Conclusons The way to mprove the marne power plant energetc effectveness s nter ala the applcaton of recovery systems of the waste energy whose basc source on the shps wth Desel propulson, presently domnatng n the worldwde fleet, are the pston Desel engnes, whch consst ther man propulson. There s a large varety of the possble arrangements of such systems. Besdes the most smple and commonly appled systems that satsfy exclusvely the heatng demands on the shp, a growng nterest can be observed n respect to the more complex systems where mechancal and electrc energy s addtonally generated. The acceptance of the specfc system for the applcaton s subject to the type and sze of the shp, the power ratngs and the type of her man engne, as well as the acceptable nstallaton cost. The comparatve analyss of the waste energy recovery systems at the stage of the executon of the prelmnary desgn of the shp s power plant makes ther choce possble, when reasonably smple and complex methods of ther evaluaton are avalable. References Power, kw 1. MARCINIAK J., MICHALSKI R.: Ablty assessment of electrc energy producton by the shp waste-heat turbogenerators, based on a real object analyss. Polsh Martme Research, No. 2(26), June 1999, vol. 6, MICHALSKI R., ZEŃCZAK W.: Analza wpływu sposobu podgrzewana wody zaslającej na parametry okrętowego kotła utylzacyjnego. XX Sympozjum Słown Okrętowych, Wydawnctwo Uczelnane Akadem Marynark Wojennej w Gdyn, Gdyna 1998, dostęp z dna CHMIELNIAK T.: Technologe energetyczne. WNT, Warszawa SZARGUT J., ZIĘBIK A.: Podstawy energetyk ceplnej. Wydawnctwo Naukowe PWN SA, Warszawa BEJAN A.: Fundamentals of exergy analyss, entropy generaton mnmzaton, and the generaton of flow archtecture. Internatonal Journal of Energy Research, vol. 26, Issue 7, May 2002, MICHALSKI R.: Przykład zastosowana analzy egzergetycznej do badana procesów utylzacj cepła odpadowego w słownach motorowych. XX Sympozjum Słown Okrętowych, Wydawnctwo Uczelnane Akadem Marynark Wojennej w Gdyn, Gdyna 1998, URBAŃSKI P.: Egzergetyczne kryterum oceny układów utylzacyjnych. XII Sesja Naukowa Okrętowców, Sekcja Okrętowców ZG SIMP, Instytut Okrętowy Poltechnk Szczecńskej, Szczecn dna czerwca 1986 r., MICHALSKI R.: Problemy projektowana systemów utylzacj energ odpadowej w okrętowych słownach motorowych. XXI Sympozjum Słown Okrętowych, Poltechnka Gdańska, Wydawnctwo Uczelnane Poltechnk Gdańskej, Gdańsk 2000, MICHALSKI R.: Wybrane aspekty oceny efektywnośc ekonomcznej rozwązań systemów utylzacj energ odpadowej w słownach motorowych. Materały XXVII Sympozjum Słown Okrętowych SYMSO 2006, Wybrane problemy projektowana eksploatacj słown, Wydawnctwo Uczelnane Poltechnk Szczecńskej, Szczecn 2006, MICHALSKI R.: Ogólna, welokryteralna metoda oceny rozwązań słown okrętowych. Referaty na XIV Mędzynarodowe Sympozjum Słown Okrętowych, Wydawnctwo Uczelnane Poltechnk Szczecńskej, Szczecn 1992, SZARGUT J. nn: Przemysłowa energa odpadowa. Zasady wykorzystana. Urządzena. WNT, Warszawa BOJARSKI W.: Podstawy metodyczne oceny efektywnośc w systemach energetycznych. Wyd. PAN, Wrocław, Warszawa, Kraków, Gdańsk BENFORD H.: A second look at measures of mert for shp desgn. The Unversty of Mchgan, Ann Harbor, Mchgan KOTOWICZ J.: Elektrowne gazowo-parowe. Wydawnctwo KAPRINT, Lubln Thermo Effcency System for Reducton of Fuel Consumpton and CO 2 Emsson, MAN B&W Desel, Reg. No , P Jul.05, Copenhagen, Denmark. Other 17. MICHALSKI R.: The Applcaton of the Entropy Analyss for the Evaluaton of the Performance of the Processes wthn the Waste Energy Recovery Systems n Marne Desel Power Plants. Journal of Polsh CIMAC, Energetc Aspects, vol. 4, Gdańsk 2009, The study fnanced from the means for the educaton wthn as own research project No. NN Zeszyty Naukowe 32(104) z. 1 41