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Method for direct methanation of recirculating fluidized bed synthesis gas

A circulating fluidized bed and synthesis gas technology, applied in the field of coal-to-natural gas, to slow down the deactivation rate, ensure smooth operation, and reduce production costs

Inactive Publication Date: 2013-08-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adsorption-Enhanced Direct Methanation of Syngas in a Novel Channel Reactor Has Not Been Reported yet

Method used

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  • Method for direct methanation of recirculating fluidized bed synthesis gas
  • Method for direct methanation of recirculating fluidized bed synthesis gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] use as figure 1 The shown circulating fluidized bed synthesis gas direct methanation device, the steps are as follows:

[0023] (1) Use hydrogen and carbon monoxide as the raw material gas, mix the raw material gas and CaO particles in the mixer, enter the channel reactor after mixing, and fully contact and react with the catalyst coating coated on the wall; hydrogen The molar ratio to carbon monoxide is 1, and the total volumetric flow rate is 5m 3 / h; the particle size of CaO particles is 30 microns, and the volume fraction is 5%; the operating temperature of the reactor is 650 ° C, and the operating pressure is 2.5 MPa; the channel reactor is composed of 4 internal channels, and the size of each internal channel is 10cmX2cmX0.08cm, Ni-based catalyst on the wall of the reactor;

[0024] (2) The gas-solid mixture coming out from the channel reactor enters the cyclone separator for separation, and the separated gas product is processed by an industrial processing devi...

Embodiment 2

[0028] use as figure 1 The shown circulating fluidized bed synthesis gas direct methanation device, the steps are as follows:

[0029] (1) With hydrogen and carbon monoxide as the raw material gas, the mixture particles of CaO and MgO formed by calcining the raw material gas and dolomite are mixed in the mixer, and after mixing, they enter the channel reactor and are mixed with the catalyst coated on the wall. The coating is fully contacted and reacted; the molar ratio of hydrogen to carbon monoxide is 1, and the total volume flow rate is 5m 3 / h; the particle size of the mixture of CaO and MgO is 25 microns, and the volume fraction is 5%; the operating temperature of the reactor is 600 ° C, and the operating pressure is 2 MPa; the channel reactor is composed of 4 internal channels, each internal channel The size is 10cmX2cmX0.08cm, and the Ni-based catalyst is on the wall of the reactor;

[0030] (2) The gas-solid mixture coming out from the channel reactor enters the cyclo...

Embodiment 3

[0034] use as figure 1 The shown circulating fluidized bed synthesis gas direct methanation device, the steps are as follows:

[0035] (1) With hydrogen and carbon monoxide as the raw material gas, the raw material gas is mixed with CaO and Al 2 o 3 (Particles mixed in a mass ratio of 1:1) The mixture is mixed in the mixer, and then enters the channel reactor to fully contact and react with the catalyst coating coated on the wall; the mole of hydrogen and carbon monoxide The ratio is 0.9 and the total volumetric flow rate is 5m 3 / h; CaO and Al 2 o 3 The particle size of the mixture is 15 microns, and the volume fraction is 7%; the operating temperature of the reactor is 650°C, and the operating pressure is 3MPa; the channel reactor is composed of 4 internal channels, and the size of each internal channel is 10cmX2cmX0.08cm , on the wall of the reactor is a Ni-based catalyst;

[0036] (2) The gas-solid mixture coming out from the channel reactor enters the cyclone separa...

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Abstract

The invention discloses a method for direct methanation of recirculating fluidized bed synthesis gas, belonging to the technical field of natural gas prepared from coals. The method comprises three main steps: absorbing and strengthening direct methanation of synthesis gas through a channel type reactor; separating a product from an absorbent; and roasting the absorbent. In the channel type reactor for absorbing and strengthening the direct methanation of the synthesis gas, a catalyst is coated on the wall surface of the inner channel in grille in the reactor in a form of coating, and the absorbent is carried by reaction gas so as to pass through the grille type channel in the reactor, thereby avoiding the separation step of the catalyst and absorbent, and solving the problem that the catalyst is repeatedly oxidized and reduced so as to cause the loss of materials and the loss of energy, and the generated heat is rapidly removed by utilizing the efficient heat-transfer capability of amulti-layer channel wall surface, thereby retarding the deactivation speed of the catalyst and ensuring the stable operation of equipment.

Description

technical field [0001] The invention belongs to the technical field of coal-to-natural gas, and in particular relates to a method for direct methanation of circulating fluidized bed synthesis gas. Background technique [0002] Traditional methanation reaction (CO+3H 2 =CH 4 +H 2 O) due to its H 2 The limitation of the / CO ratio makes the synthesis gas produced by most gasifiers unable to carry out this reaction directly, but needs to adjust the H through the water vapor shift reaction. 2 / CO ratio. While the direct methanation reaction (2CO+2H 2 =CH 4 +CO 2 ) it is no longer necessary to adjust the H in the syngas produced by the gasifier 2 / CO ratio. [0003] The adsorption-enhanced direct methanation of syngas is to mix the adsorbent with the catalyst to in-situ absorb the CO produced by the direct methanation reaction. 2 , so that the CO in the reactor 2 The content of is very low, forcing the reaction to continue in the direction of methane production. Howeve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C9/04C07C1/04
Inventor 程易储博钊翟绪丽
Owner TSINGHUA UNIV
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