Treatment method for wastes produced by fluidized-bed gasification

A fluidized bed gasification and treatment method technology, applied in the field of waste treatment, can solve the problems of poor combustion performance, short residence time, multi-energy and binder, etc., to meet the requirements of industrialization, realize utilization, method and process simple effect

Inactive Publication Date: 2018-07-06
BEIJING QUNYOU NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the small particle size of the fly ash itself, the residence time after being burned directly into the furnace is short, the combustion effect is not ideal, and the combustion performance is poor.
Mixing fly ash with pulverized coal and forming it into the furnace for combustion requires more energy and binder, which is not conducive to energy saving and emission reduction
General gas manufacturers do not have the conditions for calcining limestone, which makes fly ash unusable and wastes resources
Fly ash flotation carbon recovery process needs to consume a lot of chemical raw materials and energy, high processing costs, not conducive to energy saving and emission reduction, and poor adaptability, recovery yield depends on the wettability of particles
Therefore, there is no feasible, simple and efficient treatment method for fluidized bed fly ash at present, and the treatment of fly ash has always troubled users, affecting the popularization and use of fluidized bed.
[0005] Moreover, a lot of wastewater will be generated during the fluidized bed gasification process, which is generally treated by the sewage treatment plant, resulting in an increase in the operating cost of the device

Method used

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  • Treatment method for wastes produced by fluidized-bed gasification

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Embodiment approach

[0028] As a preferred embodiment of the present invention, step D is also included: using the activated material obtained in step C for adsorption treatment of wastewater, after the adsorption is completed, it is air-dried and dehydrated, and then sent to the gasifier for firing again to obtain the crushed Activation material, after being broken, the activation material and the activation material are discharged from the gasifier together, and after being screened and separated, the activation material is used again in the process of adsorption and treatment of wastewater. Furthermore, the carbon content of the crushed activated material obtained through sieving and separation reaches the standard and can be used as a building material.

[0029] In step D, after the activation material is fired again, the strength loss is large and it is broken, so that the activated material and the broken activation material can be screened and separated from the material discharged from the ...

Embodiment 1

[0040]The fluidized bed fly ash, fluidized bed slag, and binder are sent to a ball mill for crushing according to the weight ratio of 65:30:5, and a mixed powder with a particle size of ≤80 μm is obtained. Among them, the carbon content of the fluidized bed fly ash is 40 wt%, the particle size is 5-50 μm, and the carbon content of the fluidized bed slag is 10 wt%. Water is added to the mixed powder, mixed and pressed to obtain raw meal with a particle size of 5 mm. Send the raw material and raw coal into the gasifier according to the weight ratio of 0.3:1, and perform activation treatment at 950°C for 20 minutes to obtain the activated material. The activation material is used to adsorb and treat the waste water produced in the fluidized bed gasification process. After the adsorption is completed, the activation material is air-dried and dehydrated, and then sent to the gasification furnace for firing again to obtain a broken activation material. After the crushing, the activa...

Embodiment 2

[0042] The fluidized bed fly ash, fluidized bed slag, and binder are sent to a ball mill for crushing according to the weight ratio of 70:20:5, and a mixed powder with a particle size of ≤80 μm is obtained. Among them, the carbon content of the fluidized bed fly ash is 25 wt%, the particle size is 100-200 μm, and the carbon content of the fluidized bed slag is 5 wt%. Water is added to the mixed powder, mixed and pressed to form a raw meal with a particle size of 8 mm. Send the raw material and raw coal into the gasifier according to the weight ratio of 0.2:1, and perform activation treatment at 1050°C for 10 minutes to obtain the activated material. The application process of the activator is the same as in Example 1.

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Abstract

The invention relates to a treatment method for wastes produced by fluidized-bed gasification. The method comprises the following steps: A, uniformly mixing fluidized-bed fly ash, fluidized-bed furnace slag and a binding agent and crushing to obtain mixed powder; B, adding water into the mixed powder and pressing and molding to obtain a raw material; C, conveying the raw material and raw coal intoa gasification furnace and carrying out activation treatment to obtain an activated material. According to the treatment method provided by the invention, the fluidized-bed fly ash and the fluidized-bed furnace slag are activated to generate a uniform and developed pore structure and are used as materials for adsorbing and treating wastewater, and a pore-forming agent does not need to be additionally added, so that carbon combustion of the fluidized-bed fly ash and the fluidized-bed furnace slag in an activation process can provide part of energy to the activation process and maximum utilization of non-renewable resources is realized; the method has a simple technology and can realize waste utilization and generate relatively good economic benefits.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a treatment method for waste produced by fluidized bed gasification. Background technique [0002] Fluidized bed gasification technology has the advantages of wide adaptability to coal types, low investment, and quick results, and is an important direction for the development of coal conversion technology. The coal gas produced by fluidized bed gasification technology will carry a large amount of gasification fly ash with high carbon content. The fly ash produced by these gasifications has a very small particle size and is difficult to regasify, resulting in low carbon conversion in the gasifier. This not only causes waste of energy, but also pollutes the environment and affects human health. At the same time, there is also a certain amount of residual carbon in the ash produced by the fluidized bed gasification process, which is generally used directly as building mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20C02F1/28
CPCB01J20/20B01J2220/4887C02F1/283
Inventor 王光尚久石沈大平常玉洁
Owner BEIJING QUNYOU NEW ENERGY TECH CO LTD
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