What is the maximum capacity for a single series in the purification section?
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What is the maximum processing capacity per series in the purification unit at the current stage? If the Texaco water-coal slurry gasification process is used, with a daily coal input of 3,500 tons, can a series of units in the purification section meet the requirements?
A purification unit with a daily coal input of 3,000 tons can meet production demands using LINDE low-temperature methanol washing units (as in Jinling Petrochemical), but I believe 3,500 tons is achievable.
This generally depends on the level of your purification design capabilities, and secondly, on the sulfur and carbon content in your gas. Taking everything into account, the key factor is still the design capability, which is generally provided by manufacturers specializing in design!
I have only heard that methanol plants with an annual production capacity of 1 million tons use a single set of methanol washing units! I’ve never heard of anything bigger than that!
The inlet gas flow rate for the low-temperature methanol washing unit in the Datang International Keqi coal-to-natural gas project is 640,000 Nm3/h. Project parameters and notes (range of variation): Gas flow rate, Nm3/h: 632,398. Components: CO, % (vol): 12.09; H2, % (vol): 39.93; CO2, % (vol): 33.47 (range: 31–35); CH4, % (vol): 12.61; AR+N2, % (vol): 0.23; C2H4, % (vol): 0.02; C2H6, % (vol): 0.25; C3+, % (vol): 0.116; C4+, % (vol): 0.089; NH3, % (vol): 0.14; H2S, % (vol): 0.73 (range: 0.7–0.76); COS, % (vol): 0.06 (range: 0.05–0.06); HCN, % (vol): 120 ppm; H2O, % (vol): 0.28. Temperature: 40°C; Pressure in the feed zone: 3.42 MPa(g). It is planned to use one set of low-temperature methanol washing units, with Lurgi pressure swing gasification technology at 4.0 MPa. Please let us know if this approach is feasible
Low-temperature methanol washing is the better option; other methods cannot guarantee the desired results
The daily coal input amounts to 3,500 tons, and the volume of gas entering the purification system is around 190,000 cubic meters. For low-temperature methanol washing, this represents a moderate capacity for the plant, so there is no need to worry. It won’t work if NHD is used.