Quenching type methanation process with heat removing internally

A methanation and cold-shock technology, which is applied in the methanation process field, can solve the problems of coke oven gas not being used effectively, environmental pollution, energy waste, etc., and achieve the effect of improving service life, reducing device cost, and reducing investment

Inactive Publication Date: 2016-05-04
SHANXI HIGH CARBON ENERGY LOW CARBON RES & DESIGN INST CO LTD +1
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AI Technical Summary

Problems solved by technology

Surplus coke oven gas is about 95.4 billion Nm 3 , the quantity is huge, except that part is used for power generation, hydrogen extraction, synthetic methanol and synthetic ammonia, there is still a large amount of coke oven gas that has not been effectively utilized, causing serious environmental pollution and energy waste

Method used

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  • Quenching type methanation process with heat removing internally

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Comparison scheme
Effect test

Embodiment 1

[0025] according to figure 1 As shown in the process flow, the dry base flow rate of raw gas is 1000 kmol / h, the total sulfur after deep purification is 0.015 ppm, the pressure is 1.0 MPa, and the temperature is 250 °C. The composition (mole fraction, dry basis) of the raw material gas after deep purification is H 2 58.2%, CO 8.3%, CO 2 2.7%, CH 4 24.2%, N2 4.6%, C 2 h 6 2%. The raw material gas is divided into two parts, wherein, the raw material gas volumes of the first part and the second part are 3000 kmol / h and 7000 kmol / h respectively, and the flow rate of water vapor is 4500 kmol / h. The mixed gas of raw material gas and steam is preheated to 250°C and enters the upper part of the methanation reactor, and the outlet temperature of the fixed bed is 453°C. The second part of the raw material gas is mixed with high-temperature methane-enriched gas for cooling shock, and the temperature of the mixed gas after cooling is 355°C, CO+CO 2 The mole fraction (wet basis) in ...

Embodiment 2

[0027] according to figure 1 As shown in the process flow, the dry base flow rate of raw gas is 10000 kmol / h, the total sulfur after deep purification is 0.02 ppm, the pressure is 1.5 MPa, and the temperature is 250 °C. The composition (mole fraction, dry basis) of the raw material gas after deep purification is H 2 58.2%, CO 8.3%, CO 2 2.7%, CH4 Accounting for 24.2%, N 2 4.6%, C 2 h 6 2%. Divide the raw material gas into two parts, wherein the raw gas volumes of the first part and the second part are 6000 kmol / h and 4000 kmol / h respectively, and the flow rate of water vapor is 1800 kmol / h. The mixed gas of raw material gas and steam is preheated to 250°C and enters the upper part of the methanation reactor, and the outlet temperature of the fixed bed is 602°C. The second part of the raw material gas is mixed with high-temperature methane-enriched gas for cooling shock, and the temperature of the mixed gas after cooling is 486°C, CO+CO 2 The mole fraction (wet basis) in...

Embodiment 3

[0029] according to figure 1 As shown in the process flow, the dry base flow rate of raw gas is 10000 kmol / h, the total sulfur after deep purification is 0.01 ppm, the pressure is 3.0 MPa, and the temperature is 150 °C. The composition (mole fraction, dry basis) of the feed gas after deep purification is 58.2% for H2, 8.3% for CO, 2.7% for CO2, 24.2% for CH4, 4.6% for N2, and 2% for C2H6. The raw material gas is divided into two parts, and the raw material gas volumes of the first part and the second part are 5000 kmol / h and 5000 kmol / h respectively. The flow rate of steam is 2000 kmol / h. The mixed gas of raw material gas and steam is preheated to 300°C and enters the upper part of the methanation reactor, and the outlet temperature of the fixed bed is 627°C. The second part of the raw material gas is mixed with high-temperature methane-enriched gas for cooling shock, and the temperature of the mixed gas after cooling is 436°C, CO+CO 2 The mole fraction (wet basis) in the m...

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Abstract

The invention relates to a quenching type methanation process with heat removing internally, and belongs to the field of methanation process of H2, CO and CO2 gas. The methanation process comprises the following steps: after deep purification of feed gas, the feed gas is divided into two parts; a first part and water vapour are mixed and heated, and enter into the upper part of a methanation reactor, and high temperature methane-rich gas is produced after production reaction; a second part of the feed gas enters into the middle part of the reactor, and the part of feed gas mixes and quenches the high temperature methane-rich gas; the quenched mixed gas enters the lower part of the reactor for a methanation reaction, and a methanated product methane-rich gas is obtained. The feed gas is divided into two part, and a quenching segment is additionally installed in the middle, heat from the methanation reaction of the first part of the feed gas heats the second part of the gas, so that amount of the feed gas which needs preheating in the first part is effectively reduced, preheaters are reduced, and apparatus cost is reduced. The methanation process has the advantages of good controllability, a small amount of heat exchangers, low investment of the whole methanation equipment, small land occupation area, and low production cost, and recycle gas is not needed.

Description

technical field [0001] The invention belongs to H 2 , CO and CO 2 The gas methanation process field is specifically a cold-shock internal transfer heat methanation process. Background technique [0002] my country is the world's largest coke producer, with a total production capacity of more than 450 million tons. According to the statistics of the China Coking Association, there are more than 2,000 large, medium and small coking enterprises in the country (over 900 large-scale coking enterprises), of which 1 / 3 of the production capacity is in the iron and steel complex (coke oven gas is mainly used as fuel or smelting reducing agent), 2 / 3 of the production capacity is in independent coking enterprises. In 2014, the coke output was 477 million tons, accounting for more than 60% of the global total output. At the same time, the by-products are rich in CO and CO 2 、H 2 and CH 4 Coke oven gas and other gases. According to the by-product of about 400Nm per ton of coke 3 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08
CPCC10L3/08C10L2200/0277C10L2200/0281C10L2200/0286C10L2290/06C10L2290/141
Inventor 陈钢张新波陈国青杨宽辉李琨杰马磊张毅何洋郭雄郑珩谭建冬
Owner SHANXI HIGH CARBON ENERGY LOW CARBON RES & DESIGN INST CO LTD
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