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.

Inactive Publication Date: 2013-03-20
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016]Currently, there is no report in China that synthetic natural gas is produced from calcium carbide furnace gas, and food-grade CO2 is produced as a by-product

Method used

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  • Process for co-producing and synthetic natural gas and food-grade carbon dioxide by using calcium carbide furnace gas
  • Process for co-producing and synthetic natural gas and food-grade carbon dioxide by using calcium carbide furnace gas
  • Process for co-producing and synthetic natural gas and food-grade carbon dioxide by using calcium carbide furnace gas

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Experimental program
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Effect test

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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Abstract

The invention discloses a process for co-producing synthetic natural gas and food-grade carbon dioxide by using calcium carbide furnace gas. The process sequentially comprises the steps that after purified calcium carbide furnace gas is pressurized and mixed with medium-pressure steam and then the obtained mixture enters a shift-converter to carry out shift-conversion, the obtained gas enters a methanation reactor to carry out methanation, and then enters a decarbonization system to remove CO2; the gas subjected to CO2 removal is dried, and then enters a methane concentration system to carry out concentration, thereby obtaining synthetic natural gas; and the removed CO2 is prepared into food-grade CO2 through a recovery unit. The decarbonization system can adopt a PSA (pressure swing adsorption) dry decarburization process, and also can adopt a wet decarburization process. The wet decarburization is implemented by removing CO2 by using a thermokalite method or MDEA washing. A CO2 recovery unit has the functions of CO2 collecting, purifying, and purification by flash distillation. The methane concentration can be implemented by concentrating methane by using a PSA method, and also can be implemented by concentrating methane through low-temperature separation. The process disclosed by the invention is a packaged technology for co-producing synthetic natural gas and food-grade carbon dioxide by using calcium carbide furnace gas, which is suitable for industrial scale applications.

Description

technical field [0001] The invention belongs to the field of recovery and utilization of industrial tail gas, and specifically relates to a process for co-producing synthetic natural gas and food-grade carbon dioxide from calcium carbide furnace gas. [0002] Background technique [0003] my country is the world's largest producer of calcium carbide. In 2011, the production capacity of calcium carbide was 25 million tons, accounting for 90.9% of the world's total production capacity, and the output was 17.38 million tons. The core equipment for calcium carbide production is calcium carbide furnace. From the principle and structure of calcium carbide production, calcium carbide furnace is divided into closed calcium carbide furnace and open calcium carbide furnace. For every ton of calcium carbide produced, the open calcium carbide furnace produces 9000-12000m 3 Dust-containing flue gas, the closed calcium carbide furnace produces 400-600m 3 Dusty calcium carbide furnace...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08C01B31/20C01B32/50
CPCY02A50/20
Inventor 陈耀壮郑珩马磊廖炯蒋贵仲温少桦
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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