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A kind of flow direction change cycle operation reaction device and application of syngas methanation

A technology of reaction device and periodic operation, applied in the field of coal chemical industry, can solve the problems that the overall efficiency needs to be further improved, the heat transfer process has many steps, etc., and achieve the effects of improving the final conversion rate, strengthening the process, and reducing pulverization.

Inactive Publication Date: 2014-10-29
DATANG INT CHEM TECH RESINST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN101979476A discloses the process technology of using a slurry bed reactor, which solves the removal of reaction heat, but there are many steps in the heat transfer process, and the overall efficiency needs to be further improved in large-scale industrial applications

Method used

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  • A kind of flow direction change cycle operation reaction device and application of syngas methanation
  • A kind of flow direction change cycle operation reaction device and application of syngas methanation
  • A kind of flow direction change cycle operation reaction device and application of syngas methanation

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Experimental program
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Effect test

Embodiment 1

[0054] Embodiment 1 (technical process sees figure 1 )

[0055] The raw material gas enters the reactor unit after being preheated to 120°C by the raw material preheating heat exchanger 9; the g-h port of the two-position four-way valve is connected, and the i-j port is connected, and at the same time, the communication relationship between the g-i port and the h-j port is naturally disconnected , the feed gas flows from top to bottom in the packed bed catalytic reactor 5; reaching the half cycle time t 1 / 2 At this time, the g-i port and the h-j port of the two-position four-way valve are connected through computer control, and at the same time, the communication relationship between the g-h port and the i-j port is naturally disconnected. At this time, the raw material gas flows from bottom to top in the packed bed catalytic reactor 5 up flow; by setting the half cycle time t 1 / 2 , regularly and alternately automatically control the opening and closing of the four valves o...

Embodiment 2

[0057] Embodiment 2 (technical process sees figure 2 )

[0058] The raw material gas enters the first reactor unit 14 after being preheated to 200°C by the raw material preheating heat exchanger 9, and the gas from the first reactor unit 14 enters the second reactor unit 15 for further reaction; 50% of the gas coming out of the two reactor units 15 enters the next process as product gas, and the remaining 50% enters the reactor unit 16 for further reaction; the gas coming out from the third reactor unit 16 enters the first Two reactor units 15 carry out further reactions.

[0059] The half-cycle time t used by the three reactor units 1 / 2 Both are 15 minutes, the methanation catalyst used is an industrial nickel-based catalyst with a nickel content of 10wt%, the reaction temperature is 400°C, the pressure is 0.6MPa, and the space velocity of the feed gas is 5000 h -1 . Using the device and method can make the conversion rate of the raw material gas reach 95%, and the volum...

Embodiment 3

[0061] Embodiment 3 (technical process sees image 3 )

[0062] The raw material gas enters the third reactor unit 16 after being preheated to 250°C by the raw material preheating heat exchanger 9; 50% of the gas coming out of the third reactor unit 16 enters the first reactor unit 14, and the rest 50% enters the second reactor unit 15 for further reaction; the gases from the first reactor unit 14 and the second reactor unit 15 are mixed and enter the next process as product gas.

[0063] The half-cycle time t used by the three reactor units 1 / 2 Both are 20 minutes, the methanation catalyst used is an industrialized nickel-based catalyst with a nickel content of 10wt%, the reaction temperature is 350°C, the pressure is 0.6MPa, and the space velocity of the feed gas is 5000h -1 . Using the device and method can make the conversion rate of raw material gas reach 94%, and the volume fraction of methane in product gas reach more than 96%.

[0064] In this embodiment, three rea...

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Abstract

The invention discloses a reversed flow cycle operation reaction device for methanation of synthesis gas and an application thereof and belongs to the field of coal chemical industry. The reaction device comprises a reactor unit and a heat exchange device, wherein the reactor unit consists of a packed bed catalytic reactor divided into three layers, a two-station four-way valve and a connecting pipeline of the two two-way stop valves; the heat exchange device comprises a raw material preheating heat exchanger and a recovered heat exchanger; and three reactor units can be connected in three combined modes during practice. According to the device, four ports of the two-station four-way valve are alternately controlled to open and close in the process of carrying out the methanation reaction of the synthesis gas, and the flow direction of the gas is periodically changed in the packed bed catalytic reactor; and moreover, when the three reactor units are combined, the two two-way stop valves are closed, so that the whole system does not stop, and the catalysts in a certain reactor unit can be replaced, and the continuity of the production process is guaranteed. According to the device and the method, the service life of the catalyst is prolonged, and the conversion efficiency of feed gas is high.

Description

technical field [0001] The invention belongs to the field of coal chemical industry, and in particular relates to a flow-direction-changing periodic operation reaction device for syngas methanation. Background technique [0002] Natural gas is a clean, convenient, safe and high-quality energy source, and its main component is methane. It is estimated that by 2020, my country's annual consumption demand for natural gas will reach 300 billion cubic meters, there will be a gap of about 150 billion cubic meters, and the dependence on foreign countries will reach 50%. The sharp fluctuations in international energy prices will have a serious impact on my country's energy security. The characteristics of China's energy structure, which is poor in oil, low in gas and rich in coal, determine that coal will occupy the main position of China's primary energy consumption for a long time. Using China's relatively abundant coal resources or biomass resources to prepare synthetic natural...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J8/02C07C9/04C07C1/04C10L3/08
CPCY02P20/10
Inventor 陈宏刚王腾达张锴牛玉广杨勇平李安学李春启梅长松左玉帮刘学武
Owner DATANG INT CHEM TECH RESINST