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Method for enhancing tar removal and CO2 trapping of chemical-chain-gasification hydrogen production process

A technology for enhancing chemistry and tar, which is applied in the direction of gasification process, chemical industry, sustainable manufacturing/processing, etc. It can solve the problems of absorbent deactivation, poor mechanical strength of absorbent, etc., so as to improve reactivity, reduce operation and maintenance, The effect of reducing the concentration of tar

Active Publication Date: 2017-02-15
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these new absorbents did not consider how to solve the problems of gradual decrease in CaO cycle carbonation activity, deactivation of the absorbent due to carbon deposition, poor mechanical strength of the absorbent, etc.

Method used

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  • Method for enhancing tar removal and CO2 trapping of chemical-chain-gasification hydrogen production process
  • Method for enhancing tar removal and CO2 trapping of chemical-chain-gasification hydrogen production process
  • Method for enhancing tar removal and CO2 trapping of chemical-chain-gasification hydrogen production process

Examples

Experimental program
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Embodiment 1

[0031] Fuel such as biomass enters the gasifier 2 through the feeding device 1 . CaO precursors (such as quicklime) and Al 2 o 3 Precursor Al 3 (NO 3 ) 3 9H 2 O, iron compound precursor Fe(NO 3 ) 3 9H 2 O is integrated with each other in modification unit 3 to form a new composite absorbent. Quicklime, Al 3 (NO 3 ) 3 9H 2 O, Fe(NO 3 ) 3 9H 2 The mass ratio of O is controlled at about 1:1.08:0.72. In the resulting composite absorbent, the main components include CaO, Ca 12 Al 14 o 33 , Fe 2 o 3 , the mass ratio of the above three components is about 1:0.33:0.17. The composite absorbent coming out of the modifying unit then enters the absorbent feeding unit 4 and is transported to the gasifier.

[0032] A typical temperature at which a biomass gasifier operates is 750°C. Biomass undergoes a thermal decomposition reaction as shown in formula (1) at high temperature to generate CO, H 2 , CO 2 、CH 4 , a small amount of other small molecular hydrocarbon gas...

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Abstract

The invention relates to a method for enhancing tar removal and CO2 trapping of a chemical-chain-gasification hydrogen production process in a synergistic manner by using a CaO modified composite absorbent. According to the method, through the synergistic action of all ingredients of the CaO modified composite absorbent, chemical-chain gasification is carried out in a reaction route that tar decomposition and carbon deposit elimination occur more easily, so that the tar removal effect is enhanced, and the covering of molecular active sites, for trapping CO2, of CaO by tar carbon deposit is reduced. Meanwhile, the circular carbonatation reaction activity, mechanical strength and wear resistance of the absorbent are improved. The method is beneficial to the reduction of supplement amount of a fresh CaO absorbent and the reduction of investment and operating costs of a chemical-chain gasification system.

Description

[0001] (1) Technical field [0002] The invention relates to a method of using CaO modified composite absorbent to synergistically enhance the process of tar removal and CO in the process of chemical chain gasification hydrogen production 2 method of capture. [0003] (2) Background technology [0004] A chemical loop gasification hydrogen production technology based on CaO absorbent (not only for biomass, but also for bituminous coal, lignite, etc.) has attracted widespread attention at home and abroad in recent years. In the gasifier of this technology, biomass and other highly volatile organic compounds (mainly composed of three elements C, H, and O) and gasification agent steam are generated at a typical temperature of about 600-800°C. A series of complex pyrolysis gasification reactions, a large amount of CaO solids are simultaneously added to the gasifier. CaO absorbs CO by 2 The chemical reaction (carbonation reaction), not only the CO generated during the pyrolysis a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/00C10J3/64
CPCC10J3/00C10J3/64C10J2300/0916C10J2300/0976C10J2300/0996C10J2300/1612Y02P20/10
Inventor 韩龙张媛林康徐璋任建莉平传娟严密胡艳军钟英杰
Owner ZHEJIANG UNIV OF TECH
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