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Device and method for preparing methane by coal catalytic gasification in fluidized bed with nozzles

A fluidized bed gasifier, fluidized bed technology, applied in the details of gasification device, gasification process, granular/powdered fuel gasification, etc., can solve the problems of low carbon conversion rate, low methane yield and operating cost Advanced problems, to achieve the effect of increasing carbon conversion rate, increasing methane yield and reducing production cost

Pending Publication Date: 2019-04-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems mainly solved by the present invention is the problems of low carbon conversion rate, low methane yield, high energy consumption and high operating cost in the prior art. The present invention proposes a fluidized bed coal catalytic gasification with nozzles The device, which adds a nozzle feed system to the main structure of the fluidized bed reactor, allows the coal slurry to enter the fluidized bed reactor, thereby reducing the addition of water vapor in the gasification agent and reducing operating costs , increased carbon conversion and methane yield

Method used

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  • Device and method for preparing methane by coal catalytic gasification in fluidized bed with nozzles
  • Device and method for preparing methane by coal catalytic gasification in fluidized bed with nozzles

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Embodiment 1

[0026] In this embodiment, the oxygen-containing gas (A) is air, and is introduced into the fluidized bed gasifier through a single-pipe jet gas distributor, and the gas distributor is arranged perpendicular to the bottom of the fluidized bed gasifier. In this embodiment, the raw material of coal slurry with a concentration of 45% is put into the lower space of the gasifier through the first nozzle, and gasification reaction occurs at an operating temperature of 800°C, and the ash generated by the reaction falls into the slag hopper due to its own gravity in the middle; while the syngas enters the upper space upwards, and is injected by the SiO2 from the second nozzle 2 / Ni catalyst contact, catalytic methanation reaction occurs, generating rich CH 4 product gas. The product gas carries the fine fly ash particles in the furnace into the gas-solid separation equipment for separation, the fly ash particles are sent to the ash hopper for collection, and the product gas is sent t...

Embodiment 2

[0028]In this embodiment, the oxygen-containing gas (A) is air, and is introduced into the fluidized bed gasifier through a multi-pipe jet gas distributor, and the gas distributor is arranged perpendicular to the bottom side of the fluidized bed gasifier. In this embodiment, the raw material of coal slurry with a concentration of 45% is put into the lower space of the gasifier through the first nozzle, and gasification reaction occurs at an operating temperature of 800°C, and the ash generated by the reaction falls into the slag hopper due to its own gravity in the middle; while the syngas enters the upper space upwards, and is injected by the SiO2 from the second nozzle 2 / Ni catalyst contact, catalytic methanation reaction occurs, generating rich CH 4 product gas. The product gas carries the fine fly ash particles in the furnace into the gas-solid separation equipment for separation, the fly ash particles are sent to the ash hopper for collection, and the product gas is sen...

Embodiment 3

[0030] In this embodiment, the oxygen-containing gas (A) is air, and is introduced into the fluidized bed gasifier through a multi-pipe jet gas distributor, and the gas distributor is arranged perpendicular to the bottom side of the fluidized bed gasifier. In this embodiment, the raw material of coal slurry with a concentration of 60% is put into the lower space of the gasifier through the first nozzle, and the gasification reaction occurs at an operating temperature of 800°C, and the ash generated by the reaction falls into the slag hopper due to its own gravity in the middle; while the syngas enters the upper space upwards, and is injected by the SiO2 from the second nozzle 2 / Ni catalyst contact, catalytic methanation reaction occurs, generating rich CH 4 product gas. The product gas carries the fine fly ash particles in the furnace into the gas-solid separation equipment for separation, the fly ash particles are sent to the ash hopper for collection, and the product gas i...

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Abstract

The invention relates to a device and a method for preparing methane by coal catalytic gasification in a fluidized bed with nozzles, the problems of low carbon conversion rate, low methane yield, highenergy consumption and high operation cost in the prior art are solved, a raw material is added into a fluidized bed gasification furnace by adopting a feeding structure of the counter-arranged nozzles, and the method is characterized in that the gasification raw material adopts coal slurry, and mainly comprises the following steps: the coal slurry enters a hearth through the nozzles of the lower-layer space of the fluidized bed gasification furnace, and is reacted with an oxygen-containing gas (not containing water vapor) from a gas distributor to generate synthesis gas; after the synthesisgas enters the upper-layer space, the synthesis gas is subjected to catalytic methanation reaction in the presence of a catalyst sprayed by the nozzles of the upper-layer space to a generate methane-rich product gas. The product gas is purified and separated, and CO, H2 and CO2 in the product gas are circularly introduced into the hearth to promote the methanation reaction and the gasification reaction process, the energy consumption of the whole system is reduced, the investment cost of the water vapor is saved, the carbon conversion rate and the methane yield are effectively improved, and the method can be applied to the technical field of coal chemical industry.

Description

technical field [0001] The invention belongs to the technical field of coal catalytic gasification for producing methane. In particular, it relates to a device and method for producing methane by catalytic gasification of fluidized bed coal with a nozzle. Background technique [0002] Natural gas is a high-quality fuel and an important chemical raw material, with the advantages of safety, reliability, and environmental protection. With the rapid development of my country's economy and the acceleration of urbanization, the demand for natural gas is increasing. my country's own natural gas production cannot meet the demand for natural gas, and the contradiction between supply and demand has become increasingly prominent. The supply gap can only be made up by relying on imports, which has greatly affected my country's energy security. my country is also a country with coal as the main energy structure, which will not change for a long time in the future. According to statisti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/56C10L3/08
CPCC10J3/56C10J2200/152C10J2300/093C10J2300/0956C10J2300/0959C10J2300/0986C10J2300/1603C10J2300/1662C10L3/08Y02P20/52
Inventor 霍威钟思青高攀金渭龙
Owner CHINA PETROLEUM & CHEM CORP
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