Quality Control of City Gas at Regasification Terminal
Shuji YAMAMOTO TOKYO GAS CO., LTD Field Operation and Planning Sect. CttContents
1. Introduction 2G2. Gas P ro duc tion Process 3. Quality Control of City Gas CttContents
1.Introduction 111.1. Self-introduction 1.2. Brief introduction of Tokyo Gas 131.3. Ou tline o f3LNGTf 3 LNG Termi nal s 2. Gas Production Process 3. Quality Control of City Gas 11S1.1.Se lf-itintrod uc tion
Shuji YAMAMOTO
2003-2004(S) Maintenance of Instruments 2005-2007(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 12B1.2.Bre ifiif in tro duc tion o fTf To kyo Gas
Hitac hi LNG Term ina l (2015~)
Headquarters
Sodegaura LNG Terminal Ohgishima LNG Terminal
Negishi LNG Terminal 13O1.3.Ou tline o f3LNGTf 3 LNG Term ina ls
NihiNegishi 1st LNG receiving terminal in Japan in 1969 Ohgishima the latest terminal in 3 terminals since 1998. SdSodegaura one of the largest terminal in the world since 1973
Negishi Ohgishima Sodegaura 13O1.3.Ou tline o f3LNGTf 3 LNG Term ina ls
Negishi Ohgishima Sodegaura Nuubeojettesmber of jetties 11 3 Number of tanks 13 3 20 Capacity of tank [Ml] 1155 600 1610 Number of Vaporizers 14 10 33 Capacity of vaporizers [t/h] 1315 970 3180 Number of Employees 135 69 158 Number of Vessels ann 78 41 206 Total LNG ann [kt] 3275 2446 4577 CttContents
1. Introduction 2G2. Gas P ro duc tion Process 3. Quality Control of City Gas 2. Gas Production Process
Flare stacks Seawater Return gas blowers BOG compressors
Power station use LNG pumps
Open Rack Odorization LNG aboveground tanks Vaporizers Cityyg gas use Unloading arms
Gas or Fuel Submerged LNG inground tanks Combustion ViVaporizers
LPG tanks LPG pumps CttContents
1. Introduction 2. Gas Production Process 3. Quality Control of City Gas 313.1. Pressure o fTf Trunk kLi Line 3.2. Calorific Value 3.3. Odorant 3. Qualit y Con tro l o f City G as
What’s the quality of city gas of Tokyo Gas? 1. Pressure of Trunk Line 2. Calorific Value 3. Odorant 31P3.1 Pressure o fTf Trunk kLi Line
Demand fluctuation (3 times difference in a day) Small absorber (30 small gas holders) (no underground storage)
Demand Fluctuation 3000 km3N/h Ohgishima 2000 Sodegaura 3 times Negishi Terminal 1000 Gas Holder
Time 0 6 121824 31P3.1 Pressure
Total F Start/Stop Pressure Control P Start/Stop
F ViVaporizers
LNG Pumps Orifice flowmeter 32C3.2 Ca lor ific Va lue
Upper limit determined by combustion quality (due to Gas Business Act) 45.0 MJ/m3N (due to General Supply Provisions) LPG Lower limit determined by combustion quality (due to Gas Business Act)
Natural gas 40-45 MJ/m3N 32C3.2 Ca lor ific Va lue
Calorific Value Control Feed Forward Control Feed Back Control
Feed forward control Feed back control
Set value LPG = 45MJ/m3N cal F cal Natural gas 32C3.2 Ca lor ific Va lue
Calorimeter for calorific value control is required “Quick Response”. = Vibration type gas density analyzer
Calorimeter for guarantee of quality is required “High Accuracy”. = GCGas Chromatography 32C3.2 Ca lor ific Va lue
Vibration type gas density analyzer
Flare stacks Seawater Return gas blowers BOG compressors
Power station use LNG pumps
Open Rack Odorization LNG aboveground tanks Vaporizers Cityyg gas use Unloading arms
A lot of N2 Gas or Fuel included in BOG Submerged LNG inground tanks Combustion ViVaporizers Vibration type calorimeter
LPG tanks LPG pumps 32C3.2 Ca lor ific Va lue
The error caused by N2 can be removed by
Vibration type gas density analyzer
Optical Interferometric calorimeter
100 100 C3H8 C3H8 C2H6 C2H6 ific value ific value rr rr 50 C2H4 50 C2H4 Calo CH4 Calo CH4
N2 N2 0 0.5 1 1.5 2 0 500 1000 1500 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 32C3.2 Ca lor ific Va lue
k : 0.65 MJ/m3N by 1% N2 Q = Qvibration − kxN 2 k’: 0.26 MJ/m3N by 1% N Q = Q − k′x 2 recractive N 2 x : contents of N2 [%]
Qrefractive − Qvibraton Q = Qrecractive − 1− k k′
Manufactured by RIKEN KEIKI Co., LTD 33Od3.3 Odoran t
Odorant TBM (Tertiary -Butyl Mercaptan ) CH (CycloHexene)
Upper limit
Standard injection rate
Lower limit (Gas Business Act) 33Od3.3 Odoran t
stroke & rpm control Odorant F T-Sulfur F analyzer Natural Plunger pump gas 33Od3.3 Odoran t
Total Sulfur in Odorized City Gas is required to measure total sulfur = Ultraviolet Fluorescence Method sulfur analyzer Thank you for your kind attention !
Please contact me if you have any questions. Shuji YAMAMOTO tel : +81-45-751-1415 E-mail : [email protected]