Process for co-producing and synthetic natural gas and food-grade carbon dioxide by using calcium carbide furnace gas
A technology for synthesizing natural gas and calcium carbide furnace gas, which is applied in the petroleum industry, inorganic chemistry, gas fuel, etc.
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Embodiment 1
[0069] Table 1 Composition of calcium carbide furnace gas
[0070] Component H 2 N 2 CO CO 2 CH 4 pressure MPa Flow Nm 3 / h V% 28.00 14.00 50.00 6.00 2.00 0.003 10000
[0071] Will 10000Nm 3 / h The purified calcium carbide furnace gas is compressed to 3.0MPa by the compressor, mixed with saturated steam with a flow rate of 2500kg / h, a temperature of 234°C and a pressure of 3.0MPa in the mixer, and then enters the shift reaction preheater to be heated to 200°C. Then it enters the shift reactor, under the action of the catalyst, 61% of the CO in the gas undergoes a shift reaction, and the shifted hot gas enters the shift preheater to preheat the raw material mixture, and enters the methanation reaction system after being cooled to 280°C , the methanation reaction occurs under the action of the catalyst. The methanation reaction system consists of two methanation reactors. After each stage of methanation reaction, a waste heat boile...
Embodiment 2
[0084] Table 3 Composition of raw calcium carbide gas
[0085] Component H 2 N 2 CO CO 2 CH 4 pressure MPa Flow Nm 3 / h V% 17.00 6.00 75.00 1.50 0.50 0.003 20000
[0086] 20000Nm 3 / h The purified calcium carbide furnace gas is compressed to 5.0MPa by the compressor, mixed with saturated steam with a flow rate of 8600kg / h, a temperature of 265°C and a pressure of 5.0MPa in the pipeline, and then enters the shift reaction preheater to be heated to 250°C. Then it enters the transformation reaction system. The transformation reaction system is composed of two reactors. After each reaction, a waste heat boiler is set to recover heat and produce steam by-product. Under the action of the catalyst, 70% of the CO in the gas undergoes a shift reaction, and the shifted hot gas enters the shift preheater to preheat the raw material gas, and enters the methanation reaction system after heat exchange to 300°C, where methane is generated under th...
Embodiment 3
[0100] Table 5 Composition of raw calcium carbide gas
[0101] Component H 2 N 2 CO CO 2 CH 4 pressure MPa Flow Nm 3 / h V% 23.00 10.00 62.00 4.00 1.00 0.003 30000
[0102] 30000Nm 3 / h The purified calcium carbide furnace gas is compressed to 4.0MPa by the compressor, mixed with saturated steam with a flow rate of 10000kg / h, a temperature of 250°C and a pressure of 4.0MPa in a mixer, and then enters the shift reaction preheater to be heated to 220°C , and then enter the shift reaction system, which consists of three reactors. After each reaction, a waste heat boiler is set to recover heat and produce steam by-product. Under the action of the catalyst, 66% of the CO in the gas undergoes a shift reaction, and the shifted hot gas enters the shift preheater to preheat the raw material mixture, and after cooling to 290°C, it enters the methanation reaction system, where methane is generated under the action of the catalyst reaction. The...
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