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Series quenching adiabatic fixed bed methanation reactor and process

A technology of methanation reactor and adiabatic fixed bed, which is applied in the fields of chemical instruments and methods, petroleum industry, chemical/physical process, etc. It can solve the problem of limited bed temperature rise and insufficient cooling of high-temperature gas at the outlet of catalyst beds, etc. problems, to achieve the effect of reducing equipment investment, improving single-column methane, and achieving integration

Inactive Publication Date: 2015-10-14
CNOOC GAS & POWER GRP +1
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  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to address the above technical problems, to provide a method that can increase the methane conversion rate of a single tower, and solve the problems that the high-temperature gas at the outlet of each bed of the catalyst cannot be sufficiently cooled, the temperature rise of the bed is limited, and the problems of fine desulfurization

Method used

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  • Series quenching adiabatic fixed bed methanation reactor and process

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Embodiment 1

[0028] A single-stage series cold shock adiabatic fixed bed methanation reactor process.

[0029] The clean synthesis gas at 170°C and 3.0MPa at 10,000 kmol / h after fine desulfurization in the ultra-precision reactor is composed of (v%): CH 4 17.767%, CO 19.008%, CO 2 1.040%, H 2 61.195%, N 2 0.840%, C 2 H 6 0.010%, AR 0.140%. It is mixed with 20t / h 400℃, 3.5MPa superheated steam, 12000kmol / h circulating gas, and then heated to 300℃ through the feed gas preheater to enter the fixed bed methanation catalyst bed, and the outlet gas temperature is 663℃. The 110t, 30°C desalinated water is pressurized by a water pump to 3.0MPa and then injected into the cold shock chamber at the lower end of the fixed bed catalyst bed to quickly cool the high-temperature gas to 315°C. The cold-shocked gas is divided into two, and one strand is cooled to After 80°C, the separated water gas is mixed with fresh synthesis gas into the fixed bed methanation catalyst bed as circulating gas, and the ot...

Embodiment 2

[0032] Process form of three-stage series cold shock adiabatic fixed bed methanation reactor

[0033] The clean synthesis gas at 170°C and 3.0MPa at 10,000 kmol / h after fine desulfurization in the ultra-precision reactor is composed of (v%): CH 4 17.767%, CO 19.008%, CO 2 1.040%, H 2 61.195%, N 2 0.84%, C 2 H 6 0.01%, AR 0.14%. The synthesis gas is divided into three for split flow, and the split ratio of the fresh gas that enters the three fixed bed methanation reactor beds in sequence is 5:3:2 by volume. The fresh gas entering the first stage of the bed is mixed with 20t / h of 400℃, 3.5MPa superheated steam and 4720kmol / h circulating gas, and then heated to 300℃ through the feed gas preheater to enter the first stage of the catalyst bed. The outlet gas temperature is 627 ℃. 40t, 30°C desalinated water is pressurized by a water pump to 3.0MPa, and then injected into the cold shock chamber to quickly cool the outlet high-temperature gas to 357°C, mix with the second stream o...

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Abstract

The invention belongs to the field of chemical engineering and particularly relates to a process of a series quenching adiabatic fixed bed methanation reactor. The process comprises the following steps: (1) dividing synthesis gas passing through an ultra-fine reactor into N paths, enabling divided synthesis gas to enter the upper end of each catalyst bed layer of the reactor; (2) mixing fresh synthesis gas entering a section of catalyst bed layer with water vapor and circulating gas and then enabling the mixed gas to enter a section of bed layer; (3) mixing fresh synthesis gas entering the Mth section of catalyst bed layer with quenched gas coming from the outlet of the (M-1)th section of bed layer, and then enabling the mixed gas to enter the Mth section of catalyst bed layer; (4) pressurizing desalted water with a desalting water pump and then enabling the desalted water to enter the lower end of each bed layer of the reactor, wherein the desalted water can be used for quenching high-temperature gas at the outlet of each bed layer of the reactor.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a technology for series-connected cold-shock adiabatic fixed-bed methanation reactors. Background technique [0002] my country's dependence on foreign natural gas has been increasing year by year, reaching about 30% in 2013. It is an unavoidable and severe reality that the contradiction between natural gas supply and demand is prominent and the gap is increasing year by year. The characteristic of my country's primary energy is "rich in coal and low in gas", and coal is the main body of my country's primary energy. In recent years, coal has become the main factor causing large-scale smog and other air pollution, and natural gas has become an ideal energy source due to its clean and environmentally friendly characteristics. Under this background, the construction of domestic coal-to-natural gas projects is in full swing. [0003] Methanation is a key technology fo...

Claims

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Application Information

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IPC IPC(8): B01J8/02C10L3/08
Inventor 高振马磊邢云杨宽辉侯建国郑珩张丹张新波宋鹏飞何洋王成硕刘玉成
Owner CNOOC GAS & POWER GRP
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