Author: Jiang Cong-Bin (1966 -), male, Sichuan Luzhou, researcher, deputy general manager. Received date:

Transcription

1 Operation of HT-L Hangtian Pressurized Gasifier for Pulverized coal Jiang Cong-bin 1, Liu Xiao-jun 1, Ge Chao-wei 2 (1. Beijing Aerospace Wanyuan Coal Chemical Engineering Co., Ltd., Beijing , China; 2. Anhui Jinmei Zhongneng Chemical Co., Ltd., Linquan Anhui , China ) Author: Jiang Cong-Bin (1966 -), male, Sichuan Luzhou, researcher, deputy general manager. Received date: Abstract: Introduce the technology process of HT- L hangtian pressurized gasification for pulverized coal, construction and operation of the demonstration plant, and assessment of the plant. Key words: HT-L hangtian gasifier; process; demonstration plant; assessment CLC No: TQ Document code: B Article ID: (2011) HT-L pulverized coal gasification technology process HT-L aerospace pulverized coal pressure gasification unit mainly includes coal grinding and drying unit, coal pressurized and transmission unit, gasification and synthetic gas washing unit, slag and grey water treatment unit. HT-L aerospace pulverized coal pressure gasification technology selects dry pulverized coal as its feedstock and uses quench process to produce crude synthesis gas. HT-L is a coil-type water cooling screen gasifier, the top Single burner, burning at high temperatures (1400~1800 ) and pressure Force (4.0MPa). The gasification agent is pure O2 and a small amount of water steam, and in the gasifier coal will gasification to generate the wet syngas(co + H2). Processes indicated in Figure 1. Figure 1 HT-L pulverized coal pressure gasification process Translation Version Page 1 / total 6 Wu Xinling-2011

2 V-1101 raw coal bunker V-1201 pulverized coal bunker V-1204 pulverized coal lock hopper V-1205 pulverized coal feed tank V-1303 MP steam drum P-1301A/B steam drum recycle pump S-1103 pulverized coal filter F-1301 Gasifier V-1303 slag lock hopper X-1101 weighing machine Q-1401/W-1411 slag removing machine E-1309 O2 heater A-1101 grinding machine V-1309 O2 buffer C-1301 washing tower F-1101 inert gas generator V-1401 HP flash tank V-1404 vacuum flash tank V-1408 O2 deaerator S-1402 filter T-1401 grey water tank S-1401 Settling tank 2. Major processes outline 2.1 Coal Milling and Drying unit The unit consists of 3 parts including coal milling, inert gas transportation, coal powder filter. Milling part uses conventional coal grinding and drying technology. Raw crashed coal coming from bunker entered into the mill after measured by the weighing machine. Pulverized coal will be obtained inside the mill, dryed and conveyed by the high temperature inert gas, and then separated through the bag filter. Pulverized coal enters into the bunker by the screw conveyor and the inert gas can be recycled. 2.2 Coal Pressurized and Transmission unit The pulverized coal, after qualified Separation, will be stored in the bunker, which connected with coal feed tank through the lock hopper. Coal Feed Tank will feed continuously to the gasifier burner with the constant pressure gap between the gasifier. The coal lock hopper will be feed at atmospheric pressure and discharge the pressurized coal to the tank in a cycle way. 2.3 Gasification and Syngas Purifying unit The Pulverized coal enters into the Burner of the gasifier through 3 coal powder pipelines. The oxygen, heated by the Oxygen pre-heater, mixes with steam in steam mixer, and will be entered into the gasifier burner with a certain ratio. The Pulverized coal will be combusted in the gasifier to produce synthetic gas (H2 And CO). Synthesis gas goes through the Quench Ring into the Quench Room, in which the synthesis gas will be cooled, humidified, dust removed and washed, saturated by water, and the slag will be rapidly solidified. And then the synthesis gas will enter into the Venturi scrubbers and synthesis gas scrubbers to further humidification, dust removing and Washing. Synthesis gas will then go into the shift process. The slag will be deposited in the water of quench room, and most of the slag can be sedimentated rapidly and discharged regularly by the slag lock hopper system. 2.4 Slag and Grey Water Treatment unit The black water, from the gasifier quench room and the bottom of synthesis gas scrubber, will enter into the slag water system. The two grade flash evaporation can remove non-condensable gases and recovery the Heat. Solid particles can be collected after flocculation, sedimentation, filtration and the Grey Water will be recycled. 3. Demonstration plant Construction and Operation 3. 1 Puyang Project Construction Translation Version Page 2 / total 6 Wu Xinling-2011

3 Puyang Longyu demonstration project was to transform the gasification part of the old gas plant fixed layer unit and it also built up the 150 kt / a methanol Purification plant, the project construction period was 18 months as below: - January 2007, started construction - January 2008, all civil construction completed - Mechanical completion in August October 13, 2008 an ignition system feeding success Running Record The HT- L pulverized coal pressurized unit of Puyang Longyu Chemical succeeded to fire and feed at 11:13 on October 13, 2008 and Gasification unit achieved a safe, stable, long-term operation after rectification in May The burner ran 146 days in total and combined burners (including two combustion Devices) ran more than a year totally. However, for the question of other system, gasification unit failed to achieve full load operation, the maximum flow of oxygen into the gasifier reached the amount of m3/ H producing fine alcohol 450 t/d Coal Shenmu coal single burning, coal mixed with Xinqiao and Wu Yanmei mix-burning, Xinqiao anthracite fines single burning Performance indicators - Gasification operation temperature: 1400~ Effective gas composition: 90%~ 92% - Effective gas (CO + H2) : the coal consumption of about 580 kg / km3 - Effective gas (CO + H2) :the oxygen consumption of about 350 m3/ Km3 3.2 Linquan project Construction Anhui Linquan chemical demonstration project was a complete new 200 kt / a methanol plant, main construction contents include gasification Devices, air separation, transformation, purification, compression, synthesis, distillation and Public works. Progress of construction projects: construction period of 24 months: - Started construction in October In October 2007, civil construction completed - August 2008, Mechanical completion - October 31, 2008 system feeding and ignition success in one time Running Record The HT- L gas space pressurized pulverized coal unit of Anhui Linquan Chemical succeeded for the first trail production at 9:08 on October 31, After two rectification, at April 15, 2009 it achieved a stable operation. April 15, 2009 to 2010 April 15, gasifier total running 326 d (calendar days 365 d), running ratio of 89.3%. Total gasification plant in 2010 Operating 338 d, 58% run ratio of 92.58%, continuous gasifier (24 h Continuous) running to 91 d; gasifier burner total running the longest record of 125 d Gasifier operation (Table 1) Table 1 Anhui Linquan HT-L Gasifier operation Feeding time Running time,d Running time,h Parking time Parking reason : : 58 High Gasification rates for the major coil, check the parking plan Translation Version Page 3 / total 6 Wu Xinling-2011

4 : : 30 A chilled water pump repair process without switching UPS power supply, resulting in Loss of power of electromagnetic pump B started tripping, gasifier interlock jumping May 18, MP boiler feed pump C running, B pump load side bearing Hot repair, 19 th, May 6: 48 C pump jump, gasifier interlock jump during the high pressure gasifier increasing the load, HP carbon dioxide L-L interlock Action, gasifier jumping Gasifier combustion instability program stop, check that port blocking residue (instrument Table indicates pressure 14kPa) Boiler Jumping off for the power off, gasifier jump Water Level rise in quench chamber, gasifier plans to stop. Heavy block in quench room. Reason from coal (curve ash Yushen steep viscosity, small Operating temperature fluctuation range) boiler jumping for failure of power plant transformer, gasifier shutdown Coal flowmeter failure creat a higher O2/coal ratio, gasifier interlock jumping Level fluctuations in chilling room, judge chilling room jam, plan to park : : 48 14: : 00 22: : : : : : : : : : : : Coal Shenmu coal, Xinzheng mixed with Shenmu coal, Xinjiang coal, Xinjiang and Xinzheng mixed coal, mixed coal with Jincheng coal, coal in Gansu, Xinjiang Poly Coal, Jincheng Anthracite mixed with Shenmu, Shemmu mix with Jincheng High-sulfur coal (sulfur content of coal 2.35%), and so on. 5 Kinds of coal single burning, a variety of blending burning Technical Indicators - Gasification operation temperature: 1400~ Effective gas composition: 92% ~93% - Effective gas (CO + H2) : coal consumption about 608 kg / km3 - Effective gas (CO + H2) : the oxygen consumption about 310 m3/ Km3 Gasifier operating records as Table Production and Consumption 2010, cumulative production of methanol Linquan t, t Methanol coal consumption:1.392 kg, steam 2 080kg, power 327kWh Linquan Chemical honors in HT L Project by China's coal gasification nitrogen Fertilizer Industry Association Grand Prize, outstanding contributions to science and technology in Fuyang City Award, Linquan scientific and technological progress. The annual national project Funds 11760KRmb. Especially cost-effective transport Translation Version Page 4 / total 6 Wu Xinling-2011

5 coal gasification project Line, as development company provides a solid technical support, win the Innovative enterprises in Anhui Province. 4. HT-L Site Assessment and Results 23th ~26 th, October 2009 Adopted by China Petroleum & Chemical Association of the site assessment. October 28, 2009, through China Petroleum and Chemical Industry Association's technical appraisal. Conclusion : (1) coal gasification + water quench process is simple and reliable, suitable for coal Chemical processes; gasification plant can be safe, stable and reliable operation. (2) gasification system, open parking, purge, ignition, open Work, investment and coal are performed automatically by the program, open parking convenience Reliable; fail-safe interlocking system covering all car run overcheng, interlocking arguments designed to ensure the safety of the device. (3) The furnace temperature measurement point in time reflects the slag cooled wall conditions Condition, indirectly reflects the furnace temperature trends, particularly in unstable coal For fixed or coal, the furnace temperature measuring point for a smooth transition and security Run played a good guide. (4) HT L pulverized coal gasification technology is the world's leading Clean coal gasification technology, has a good environmental protection, energy efficiency. (5) The device is simple, easy maintenance, investment and operation Low cost, 99% of local production, interlock device put into use 100%. Automation greater than 98%. Investment, technical support side It in a timely manner, gasifier start rate, failure rate is low. The technology has independent intellectual property rights, the overall level of technology in the international leader. 5. Promotion of HT-L aerospace pulverized coal gasification technology So far, the view from the demonstration plant operation, HT-L coal gasification process systems, instrumentation control systems, equipment, construction are well designed, some operating indicators have reached or exceeded the advanced Coal gasification technology indicators, all meet the design requirements. Currently Beijing Aerospace Wanyuan Coal Limited has entered into Coal chemical project in Table 3. Beijing Aerospace Wanyuan Coal Chemical Engineering Technology Co.,Ltd has patented technology space gasification, coal chemical Overall project design capabilities, patented proprietary equipment manufacturing capacity, equipment Driving ability, while the owners of the operating team training simulation Training, can provide comprehensive services to coal chemical projects. Table 3 List of signed projects No. Project name and capacity Size and Quantity 1 new Henan Coal Chemical 300kt /a methanol plant 2800 / 3200 two gasifiers 2 Shandong Luxi Chemical Co., Ltd. 300kt /a synthetic ammonia plant 2800 / 3200 two gasifiers 3 Shandong Rising Chemical Company 300kt /a synthetic ammonia plant 3200 / 3800 of a gasifier 4 Henan Jinkai group 600kt /a synthetic ammonia plant 3200 / 3800 two gasifiers 5 Heilongjiang Dragon Coal Shuangyashan 300kt /a methanol plant 2800 / 3200 two gasifiers 6 Anhui Linquan Chemical the Second 180kt /a synthetic ammonia plant 2800 / 3200 of a gasifier 7 Anhui Haoyuan 300kt /a synthetic ammonia project 2800 / 3200 two gasifiers 8 HaoHao Junhua 300kt /a synthetic ammonia, 200 kt / a methanol project 2800 / 3200 two gasifiers 9 Luneng Baoqing 300kt /a synthetic ammonia, 520 kt /a urea project 2800 / 3200 two gasifiers 10 Lutianhua 450kt /a synthetic ammonia, 520 kt /a urea project 3200 / 3800 two gasifiers 11 Xinjiang Zhongneng Wanyuan Chemical 400kt /a synthetic ammonia, 600kt / a urea project 2800 / 3200 two gasifiers Translation Version Page 5 / total 6 Wu Xinling-2011

6 Table 2. Gasifier operating records Translation Version Page 6 / total 6 Wu Xinling-2011