Quality Control. at Regasification Terminal. Shuji YAMAMOTO. TOKYO GAS CO., LTD Field Operation and Planning Sect.

Transcription

1 Quality Control of City Gas at Regasification Terminal Shuji YAMAMOTO TOKYO GAS CO., LTD Field Operation and Planning Sect.

2 Contents t 1. Introduction 2. Gas Production Process 3. Quality Control of City Gas

3 Contents t 1.Introduction Self-introduction 1.2. Brief introduction of Tokyo Gas Outline of f3lngt Terminals 2. Gas Production Process 3. Quality Control of City Gas

4 11S 1.1.Self-introduction lfi ti Shuji YAMAMOTO <at 3 LNG Regasification Terminals for 8 years > (S) Maintenance of Instruments (S) Renewal of Control system (DCS, F&G) 2008(O) Construction of Regasification Plant 2009~2010(N) Operation & Planning (S):Sodegaura LNG terminal (O):Ohgishima LNG terminal (N):Negishi LNG terminal

5 12B 1.2.Breif ifintroduction ti of ftokyo Gas <Business areas> (1) Regasification, supply and sales of city gas (2) Supply and sales of gas appliances (3) Energy services (4) Supply of electricity

6 12B 1.2.Breif ifintroduction ti of ftokyo Gas <Profile> Established in 1885 (LNG, from 1969) Capitalization 142 billion yen (1.2 billons Euro) Number of employees 15,539 Net sales 1,416 billions yen (12 billions Euro) Gas sales volume 14 billions m 3 Total length of gas pp pipeline 57,839 km Number of gas customers 10,637 thousands

7 13O 1.3.Outline of f3lngt Terminals Hitachi LNG Terminal (2015~) Headquarters Ohgishima LNG Terminal Sodegaura LNG Terminal Negishi LNG Terminal

8 13O 1.3.Outline of f3lngt Terminals Negishi 1 st LNG receiving terminal in Japan in 1969 Ohgishima the latest terminal in 3 terminals since Sodegaura one of the largest terminal in the world since 1973 Negishi Ohgishima Sodegaura

9 13O 1.3.Outline of f3lngt Terminals Negishi Ohgishima Sodegaura Number of jettes jetties Number of tanks Capacity of tank [Ml] Number of Vaporizers Capacity of vaporizers [t/h] Number of Employees Number of Vessels ann Total LNG ann [kt]

10 Contents t 1. Introduction 2. Gas Production Process 3. Quality Control of City Gas

11 2.Gas Production Process Return gas blowers Flare stacks BOG compressors Seawater LNG pumps Power station use Unloading arms LNG aboveground tanks Open Rack Vaporizers Odorization City ygas use Gas or Fuel LNG inground tanks Submerged Combustion Vaporizers LPG tanks LPG pumps

12 Contents t 1. Introduction 2. Gas Production Process 3. Quality Control of City Gas Pressure of ftrunk kline 3.2. Calorific Value 3.3. Odorant

13 3.Quality Control of City Gas What s the quality of city gas of Tokyo Gas? 1. Pressure of Trunk Line 2. Calorific Value 3. Odorant

14 31P 3.1 Pressure of ftrunk kline Demand fluctuation (3 times difference in a day) Small absorber (30 small gas holders) (no underground storage) Demand Fluctuation 3000 km 3 N/h times Negishi Ohgishima Sodegaura Terminal 1000 Gas Holder Time

15 31P 3.1 Pressure <Control> Automatic Control Pressure Control Number of Pumps Number of Vaporizers Start/Stop Start/Stop Total F Start/Stop Pressure Control P F Vaporizers LNG Pumps Orifice flowmeter

16 32C 3.2 Calorific Value <Standard> d LPG Upper limit determined by combustion quality (due to Gas Business Act) 45.0 MJ/m 3 N (due to General Supply Provisions) Lower limit determined by combustion quality (due to Gas Business Act) Natural gas MJ/m3 N

17 32C 3.2 Calorific Value <Control> Calorific Value Control Feed Forward Control Feed Back Control Feed forward control Feed back control Set value LPG = 45MJ/m 3 N Natural gas cal F cal

18 32C 3.2 Calorific Value <Instrument> t Calorimeter for calorific value control is required Quick Response. = Vibration type gas density analyzer Calorimeter for guarantee of quality is required High Accuracy. = Gas Chromatography

19 32C 3.2 Calorific Value <Issue> Vibration type gas density analyzer <Principle> Proportional relationship between density and calorie of Hydrocarbon <Issue> Error caused by inert gas (1 % of N 2 = 0.65 MJ/m 3 N error)

20 <Nitrogen in Boil Off Gas> Return gas blowers Flare stacks BOG compressors Seawater LNG pumps Power station use Unloading arms LNG aboveground tanks Open Rack Vaporizers Odorization City ygas use A lot of N2 included in BOG LNG inground tanks Submerged Combustion Vaporizers Gas or Fuel Vibration type calorimeter LPG tanks LPG pumps

21 32C 3.2 Calorific Value <Approach> The error caused by N 2 can be removed by <Combination of two types of calorimeter> Vibration type gas density analyzer Optical Interferometric calorimeter <Principle> Proportional relationship between refractive index and calorie of hydrocarbon

22 32C 3.2 Calorific Value <Approach> <Principle to remove the error> 150 Vibration type density analyzer MJ/m 3 N C4H10 Optical Interferometric calorimeter 150 MJ/m 3 N C4H10 rific value 100 C2H6 C3H8 rific value 100 C2H6 C3H8 Calor 50 CH4 C2H4 Calor 50 CH4 C2H4 N2 N Specific density (air=1) Refractive index (n-1)*10e6 Nitrogen looks like to have 65 MJ/m3N in vibration type density analyzer 26 MJ/m3N in optical interferomatic calorimeter

23 32C 3.2 Calorific Value <Approach> <Principle Pi i to remove the error> Q = Q kx vibration N 2 Q = Q k x recractive N 2 k : 0.65 MJ/m3N by 1% N 2 k : 0.26 MJ/m 3 N by 1% N 2 x : contents of N 2 [%] Q = Q recractive Q refractive 1 k Q k vibraton Manufactured by RIKEN KEIKI Co., LTD

24 33Od 3.3 Odorant <Standard> d Odorant TBM (Tertiary-Butyl Mercaptan ) CH (CycloHexene) Upper limit Standard injection rate Lower limit (Gas Business Act)

25 33Od 3.3 Odorant <Control> Odorant Control Pump Output Control According to the Natural Gas Flow Rate (No Feed Back Control) Measurement Points Mass Flow Rate of Odorant Total Sulfur in Odorized City Gas stroke & rpm control Natural gas F Plunger pump F Odorant T-Sulfur analyzer

26 33Od 3.3 Odorant <Instruments> t <Measurement Points> Flowmeter of Odorant is required to measure Minute Mass Flow. = Coriolis flowmeter Total Sulfur in Odorized City Gas is required to measure total sulfur = Ultraviolet Fluorescence Method sulfur analyzer

27 Thank you for your kind attention! Please contact me if you have any questions. Shuji YAMAMOTO tel : shuji@tokyo-gas.co.jp