New process for synthesizing natural gas by methanation of coke oven gas

A technology for synthesizing natural gas and gas methane, which is applied in the petroleum industry, gas fuel, fuel, etc., can solve the problems of low heat recovery rate and high temperature, and achieve the effect of small gas circulation volume, cost reduction, and circulating gas volume reduction.

Inactive Publication Date: 2011-04-20
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The reaction is a strong exothermic reaction, which will generate a high temperature. At present, the main methanation process is multi-stage heat exchange after the methanation reactor, and the heat recovery rate is low, such as:

Method used

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  • New process for synthesizing natural gas by methanation of coke oven gas
  • New process for synthesizing natural gas by methanation of coke oven gas
  • New process for synthesizing natural gas by methanation of coke oven gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as Figure 4 Shown: coke oven gas composition (vol%) is: H 2 57.6,CH 4 26.9, CO 7.2, CO 2 2.1,N 2 4.1,C 2 h 6 2.1, the purified raw gas volume is 1000 kmol / h (22400 Nm 3 / h).

[0038] 404 kmol / h (9049.6 Nm 3 / h) The coke oven gas is passed into the methanation reactor-R1, and the circulation ratio is 2.1. At this time, CO+CO 2 The concentration of the gas is 3.0%, the inlet temperature is 280°C, and the reactor outlet temperature is 456°C. After passing through the methanation reactor-R1, the outlet gas is 848.4 kmol / h (19004.2 Nm 3 / h) coke oven gas mixture, at this time the CO+CO participating in the reaction 2 The concentration of the gas is 3.4%, and the inlet temperature of the second methanation reactor R2 is about 300°C. After the reaction gas comes out, heat exchanger 1, heat exchanger 2 B1, and heat exchanger 3 E2 are used for centralized heat exchange. Part of it is preheated by compressor P to a certain temperature so that it is mixed with...

Embodiment 2

[0040] In this example, the methanation reaction process of synthesizing natural gas from coke oven gas is as follows: Figure 5 Shown:

[0041] The composition of the purified coke oven gas (vol%) is: H 2 57.6,CH 4 26.9, CO 7.2, CO 2 2.1,N 2 4.1,C 2 h 6 2.1. The purified raw gas volume is 1000 kmol / h (22400 Nm3 / h).

[0042] 208.33 kmol / h (4446.60 Nm 3 / h) The coke oven gas is passed into the methanation reactor-R1, and the circulation ratio is 1.325. At this time, CO+CO2 The concentration is 4.0%, the inlet temperature is 250°C, the reactor outlet temperature is 485°C, after passing through the methanation reactor-R1, the outlet gas is 64.58 kmol / h (1446.60 Nm 3 / h) cycle gas, 343.75 kmol / h (7730.98 Nm 3 / h) coke oven gas mixed, at this time the concentration of CO+CO2 participating in the reaction is 4%, the inlet temperature of R2 into the methanation reactor 2 is about 250°C, and the outlet temperature of the reactor is about 485°C. The outlet gas from metha...

Embodiment 3

[0044] In this example, the methanation reaction process of synthesizing natural gas from coke oven gas is as follows: Figure 6 Shown:

[0045] The composition of the purified coke oven gas (vol%) is: H 2 57.6, CH 4 26.9, CO 7.2, CO 2 2.1,N 2 4.1,C 2 h 6 2.1. The purified raw gas volume is 1000 kmol / h (22400 Nm 3 / h).

[0046] 135.87 kmol / h (3043.49 Nm 3 / h) The coke oven gas is passed into the methanation reactor-R1, and the circulation ratio is 1.657. At this time, CO+CO 2 The concentration is 3.5%, the inlet temperature is 280°C, the reactor outlet temperature is 485°C, after passing through the methanation reactor-R1, the outlet gas is 38.72 kmol / h (867.33 Nm 3 / h) cycle gas, 201.09 kmol / h (4504.42Nm 3 / h) coke oven gas is mixed, at this time, the inlet temperature of R2 into the methanation reactor 2 is about 280°C, and the CO+CO participating in the reaction 2 The concentration is 3.5%, the reactor outlet temperature is about 485°C, and the outlet gas a...

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Abstract

The invention belongs to the technical field of coke oven gas application, and particularly relates to a new process for synthesizing natural gas by methanation of coke oven gas. After the coke oven gas diluted by recycle gas passes through a methanation reactor bed, the coke oven gas and the recycle gas in a certain ratio enter a methanation reactor, the gas at the inlet of the methanation reactor of each stage consists of CO and CO2 which are less than 7 percent, the temperature of the inlet of the methanation reactor of each stage is controlled to be between 220 and 400 DEG C, and heat exchange is performed in the reactor of the last stage through a heat exchanger. The process can protect the environment and save energy; on technology, the methanation reaction process can sharply reduce the number of the heat exchangers and make full use of heat generated in the reaction; the process can well control the composition of the raw material gases entering the methanation reactor of each stage; and meanwhile, the process effectively controls the temperature of the gas at the outlet of the methanation reactor. The process is favorable for selection of reactor materials, reduces the quantity of the recycle gas, and reduces energy consumption so as to reduce the cost.

Description

technical field [0001] The invention belongs to the application technical field of coke oven gas, and in particular relates to a new process for producing synthetic natural gas through methanation of coke oven gas. Background technique [0002] The annual production capacity of coke in my country is 360 million tons, 324 million tons in 2008 and 345 million tons in 2009, one-third of the production capacity is in iron and steel complexes, and two-thirds are in independent coking enterprises . About 400m by-product per ton of coke 3 Calculation of coke oven gas, the annual by-product gas volume of independent enterprises is 100 billion m 3 Above, in addition to self-use, domestic and commercial fuels, the coke oven gas released every year exceeds 20 billion m3 3 . Using coke oven gas methanation to produce synthetic natural gas has the function of turning waste into treasure. [0003] The typical composition of coke oven gas is as follows: [0004] name CH ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08
Inventor 郭雄刘玉成张新波李泽军王大军
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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