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Biomass and coal co-gasification system and gasification method

A biomass and co-gasification technology, applied in chemical instruments and methods, steam generation methods using heat carriers, separation methods, etc., can solve problems such as ineffective use of energy, and improve the conversion rate and reactivity of coal gasification Strong, increased reaction time effect

Pending Publication Date: 2020-09-18
KEDA MAS CLEAN ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that energy cannot be effectively utilized when biomass and coal are co-gasified in the prior art, the present invention provides a biomass and coal co-gasification system and gasification method

Method used

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  • Biomass and coal co-gasification system and gasification method

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Effect test

Embodiment 1

[0039] Such as figure 1 As shown, a biomass and coal co-gasification system includes a raw coal feeding device and a biomass feeding device, both feeding devices are connected to the feeding pipe 7, and the raw coal and biomass are mixed in the feeding pipe 7 The feed pipe 7 is connected to the fluidized bed gasification furnace 8, and the gasification reaction of the mixture occurs in the fluidized bed gasification furnace 8 to generate high-temperature gasification gas; coal is the main component of China's energy structure, and its Compared with biomass resources, the output supply is stable, the particles are more regular, and the energy density is high. Therefore, the co-gasification technology of biomass and coal can well make up for the defects of poor stability, irregular particles, low energy density, and high tar yield in the gasification process when biomass is gasified alone; Disadvantages in terms of resource reserves, greenhouse gas emissions, reactivity, etc., ...

Embodiment 2

[0051] Basically the same as in Example 1, in this implementation, the waste heat recovery device also includes an economizer 15, and the waste heat recovery device 13, the steam drum 14 and the deaerator 21 are respectively connected with the economizer 15, and the setting of the economizer 15 will, on the one hand, The deoxygenated and desalted water in the deaerator 21 is heated before entering the steam drum 14 to reduce the heat absorption of the deoxygenated and desalted water on the heating surface, and the economizer 15 can be used to replace part of the evaporation heating surface with high cost; On the other hand, when the desalted water temperature increases and enters the steam drum 14, the wall temperature difference of the steam drum 14 will be reduced, and the thermal stress will be reduced accordingly, prolonging the service life of the steam drum 14; Deoxygenated and desalinated water is preheated to maximize the utilization of waste heat from gasification gas....

Embodiment 3

[0053] It is basically the same as that in Embodiment 2. In this embodiment, the fluidized bed gasifier 8 includes an upper dilute-phase zone and a lower dense-phase zone. The upper dilute-phase zone is provided with a secondary gasification agent injection device 8a. The secondary gasification agent The injection device 8a is connected to the steam power generation device, and the secondary gasification agent in the secondary gasification agent injection device 8a continues to undergo reduction reaction with the high-temperature gasification gas produced by the gasification reaction, so as to improve the coal gasification efficiency and the quality of the gasification gas , and at the same time perform a chilling effect on the high-temperature gasification gas to reduce the heat load of the subsequent high-temperature preheater 10, reduce the cost input of equipment materials, and improve the service life of the equipment; in this implementation, the secondary gasification agen...

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Abstract

The invention discloses a biomass and coal co-gasification system and gasification method, and belongs to the field of carbon-based solid fuel energy utilization. The problem that energy cannot be effectively utilized when biomass and coal are gasified together in the prior art is solved. The biomass and coal co-gasification system comprises a raw coal feeding device and a biomass feeding device,the two feeding devices are connected with feeding pipes, the feeding pipes are connected with a fluidized bed gasification furnace, the fluidized bed gasification furnace is connected with a dust removal device, a waste heat recovery device is further arranged between the fluidized bed gasification furnace and the dust removal device, the waste heat recovery device is connected with the steam power generation device, and the steam power generation device provides steam for gasification reaction in the fluidized bed gasification furnace. Sensible heat recovery is conducted on high-temperaturegasified coal gas through the waste heat recovery device, superheated steam generated through recovery is used for power generation of the steam power generation device, the steam power generation device provides steam for gasification reaction, and the energy utilization rate is remarkably increased. The gasification method utilizing the system is simple and convenient to operate and high in safety.

Description

technical field [0001] The invention belongs to the technical field of carbon-based solid fuel energy utilization, and more specifically relates to a biomass and coal co-gasification system and a gasification method. Background technique [0002] As a large agricultural country, our country produces a large amount of plant straw every year. At present, the utilization of biomass such as rice straw and corn straw in my country mainly adopts the methods of direct incineration or crushing and burying. Such a utilization method not only wastes resources greatly, but also causes serious environmental and traffic problems due to the smog produced by biomass incineration. Therefore, if the energy and chemical industry with biomass as raw material can be developed, the petrochemical raw material equivalent to producing hundreds of millions of tons of standard coal per year will effectively relieve the pressure on the tight supply of petrochemical energy raw materials. It can not o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/56C10J3/50C10J3/52F22G1/00F22G7/00F22D1/50F22B1/18
CPCC10J3/50C10J3/52C10J3/56F22B1/18F22D1/50F22G1/00F22G7/00Y02P20/10Y02P20/129
Inventor 蒋芹刘定超罗海斌朱晨军魏钊韩忠辉孙肖茹
Owner KEDA MAS CLEAN ENERGY
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