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A method and system for producing synthetic natural gas or co-production of hydrogen by combined use of circulating fluidized bed dry thermal desulfurization

A circulating fluidized bed, synthetic natural gas technology, applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., can solve the problems of flying temperature, increased investment cost, unfavorable reactor installation and disassembly, etc., to control temperature rise, equipment The effect of material cost reduction

Active Publication Date: 2018-04-20
SHANGHAI INT ENG CONSULTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] (1) Due to the use of circulating compressors, equipment manufacturing is difficult, investment is high, and energy consumption of the synthesis circuit increases
[0013] (2) The temperature of the methanation reaction controlled by circulating gas is generally high, and there is a possibility of overheating, which may easily cause high-temperature sintering of the catalyst
[0014] (3) Due to the high temperature of methanation, the methanation reactor needs a fairly thick refractory lining, which is not conducive to the installation and disassembly of the reactor and is prone to damage to the lining
[0015] (4) Since the outlet temperature of the methanation reactor is too high, the subsequent heat exchange equipment and pipelines have high temperature resistance, thus increasing the investment cost

Method used

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  • A method and system for producing synthetic natural gas or co-production of hydrogen by combined use of circulating fluidized bed dry thermal desulfurization
  • A method and system for producing synthetic natural gas or co-production of hydrogen by combined use of circulating fluidized bed dry thermal desulfurization
  • A method and system for producing synthetic natural gas or co-production of hydrogen by combined use of circulating fluidized bed dry thermal desulfurization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0138] see figure 1 , the combined use of circulating fluidized bed dry desulfurization production synthetic natural gas system shown in the figure, including chilling washing device 100, circulating fluidized bed thermal desulfurization device 200, fine desulfurization guard bed device 300, non-sulfur-tolerant conversion device 400 , adsorption bed to remove NH 3 / HCN device 500, SNG product gas production device, MDEA carbon dioxide removal device 600, triethylene glycol dehydration device 700. The SNG product gas production device includes adiabatic methanation reactors 810 , 820 , isothermal methanation reactor 830 , heat recovery devices 840 , 850 , 860 and cooling device 870 .

[0139] The crude syngas input port 110 of the chilling washing device 100 is connected to the crude syngas output port 910 of the coal-water slurry gasification device 900 through a pipeline 1 .

[0140] The crude synthesis gas input port 210 of the circulating fluidized bed thermal desulfuriza...

Embodiment 2

[0162] see figure 2 , the combined use of circulating fluidized bed dry desulfurization production of synthetic natural gas system shown in the figure is basically the same as the system of combined use of circulating fluidized bed dry desulfurization production of synthetic natural gas in Example 1, the difference lies in the high temperature The finely desulfurized syngas is divided into two streams, one is connected to the 410 high-temperature finely desulfurized syngas inlet of the non-sulfur-resistant shift 400 device through the pipeline 4; the other is connected to the pipeline 6 through the pipeline 4a. And the content of active component Ni and other compositions of the catalyst used for the methanation reaction in the methanation boundary zone are different from those in Example 1.

[0163] The working process of the combined use of circulating fluidized bed dry desulfurization to produce synthetic natural gas system of this embodiment is as follows:

[0164] The c...

Embodiment 3

[0172] see image 3 , the combined use of circulating fluidized bed dry desulfurization production of synthetic natural gas system shown in the figure is basically the same as the system of combined use of circulating fluidized bed dry desulfurization production of synthetic natural gas in Example 2, the difference lies in the use of PSA carbon dioxide removal device 600a Instead of the MDEA carbon dioxide removal device 600 and canceling the triethylene glycol dehydration device 700, the SNG product gas outlet 620a of the PSA carbon dioxide removal device 600a directly sends out the SNG product gas. Replace the adiabatic methanation reactor 810 in Example 1 with the transport bed methane reaction device 810a, and the adsorption bed removes NH 3 Two pipelines 7a and 8 come out from the outlet 520 of the de-impurity conversion synthesis gas of / HCN device 500, and the pipeline 7a is connected with the de-impurity conversion synthesis gas inlet 811a of the transport bed methane ...

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Abstract

The invention a method for producing synthetic natural gas or coproducing hydrogen using dry-method thermal desulfurization of a circulating fluidized bed. The method includes feeding crude syngas washed by water chilling to the dry-method desulfurization of the circulating fluidized bed to desulfurize into high-temperature desulfurized syngas and SO2-rich gas, feeding the high-temperature desulfurized syngas to desulfurize in the fine desulfurization process, feeding at least part of finely-desulfurized syngas to be subjected to sulfur non-tolerant conversion in the sulfur non-tolerant conversion process so as to obtain converted syngas, feeding NH3 / HCN in the desorption converted syngas in the adsorption process to obtain impurity-removal converted syngas, feeding a part of the impurity-removal converted syngas into the methanation process to prepare methane syngas, and feeding the other part into the hydrogen making process to generate hydrogen gas. The invention further discloses a system implementing the method. Via effective reasonable configuration of dry-method thermal desulfurization of the circulating fluidized bed combined with the sulfur non-tolerant conversion, methanation and hydrogen making technology, reaction heat is sufficiently utilized, qualified SNG (synthetic natural gas) product or hydrogen products can be produced or co-produced.

Description

technical field [0001] The invention relates to a method and a device for producing synthetic natural gas or co-producing hydrogen from crude synthesis gas produced by gasification of coal or other carbon-containing materials. In particular, it relates to a process configuration for the production of synthetic natural gas or co-production of hydrogen combined with circulating fluidized bed dry thermal desulfurization and non-sulfur-tolerant shift technology, and more specifically relates to a combination of circulating fluidized bed dry desulfurization to produce synthetic natural gas Method and system for producing hydrogen from natural gas or cogeneration. Background technique [0002] In the existing technology and industrial practice of using coal as raw material to produce synthetic natural gas, coal gasification is usually used to produce crude synthesis gas, which is regulated by sulfur-tolerant shift reaction and liquid-phase absorption method desulfurization and dec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/08C01B3/24
Inventor 杨震东董红军吴高杰宗丽
Owner SHANGHAI INT ENG CONSULTING
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