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A method for recycling coal-fired catalysts in chain furnaces

A coal-fired catalyst and catalyst technology, applied in the direction of fuel, solid fuel, combustion equipment, etc., can solve the problems that the catalyst cannot be recycled and the gasified coal powder particles are small, so as to improve the catalytic combustion effect, reduce dust emission, and reduce the cost of the catalyst Effect

Active Publication Date: 2017-03-01
BEIJING FUYUAN TIANHANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In recent years, there are also some published documents on coal catalytic combustion technology, such as the invention patent with application number 201410251387.8, which discloses a catalyst recovery and loading method. Since the method is fluidized bed or entrained bed gasification, it requires a catalyst It is closely loaded with pulverized coal, and the gasified pulverized coal particles are small, and it needs to be preheated at a certain temperature to fix the catalyst with the pulverized coal; the application number is 201210123360.1 invention patent, which discloses a solid combustion accelerant for chain-type coal-fired boilers , used in the combustion process of the chain furnace, the load method is directly mixed with coal, and the catalyst cannot be recycled; the invention patent application number is 201410393340.5, which discloses a method for reducing sulfur dioxide emissions from chain furnace combustion by using calcium-based metallurgical solid waste , which uses the synergistic effect of metallurgical solid waste and coal-fired catalyst to reduce the emission of sulfur dioxide, but does not involve the recycling method of the catalyst

Method used

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  • A method for recycling coal-fired catalysts in chain furnaces
  • A method for recycling coal-fired catalysts in chain furnaces

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Effect test

Embodiment 1

[0028] The invention provides a chain furnace coal-fired catalyst recycling method, the operation steps are as follows:

[0029] a, solution preparation: Ca(OH) 2 Mix with water to prepare Ca(OH) with a mass concentration of 15% 2 The solution is the coating agent slurry, mix KOH with water, and prepare a KOH solution with a mass concentration of 0.05%, which is the catalyst solution, ready for use;

[0030] b. Coal material coating: coating the outer surface of the coal material with the coating agent slurry to obtain the coated coal material, wherein the mass percentage of the used coating agent slurry to the coal material is 12%;

[0031] c. Catalyst loading: the catalyst solution is atomized, and then contacted with the coated dry coal material obtained in the b step to obtain the catalyst-loaded coal material, wherein the mass percentage of the water added to the atomization and the coal material is 14%, and the catalyst used The mass percent of the quality of solution ...

Embodiment 2

[0036] The invention provides a chain furnace coal-fired catalyst recycling method, the operation steps are as follows:

[0037] a, solution preparation: MgO is mixed with water, is mixed with the MgO solution that mass concentration is 20% and is coating agent slurry, and NaOH is mixed with water, and the NaOH solution that is mixed with mass concentration is 0.05% is catalyst solution, waits use;

[0038] b. Coal material coating: coating the outer surface of the coal material with the coating agent slurry to obtain the coated coal material, wherein the mass percentage of the used coating agent slurry to the coal material is 7%;

[0039]c. Catalyst loading: the catalyst solution is atomized, and then contacted with the coated dry coal material obtained in step b to obtain the catalyst-loaded coal material, wherein the mass percentage of the water added to the atomization and the coal material is 20%, and the catalyst used The mass percent of the quality of solution and coal...

Embodiment 3

[0044] The invention provides a chain furnace coal-fired catalyst recycling method, the operation steps are as follows:

[0045] a, solution preparation: Ca(OH) 2 Mix with water to prepare Ca(OH) with a mass concentration of 15% 2 The solution is the coating agent slurry, Na 2 CO 3 Mix with water to prepare Na with a mass concentration of 0.06% 2 CO 3 The solution is the catalyst solution, ready for use;

[0046] b. Coal material coating: coating the outer surface of the coal material with the coating agent slurry to obtain the coated coal material, wherein the mass percentage of the coating agent slurry used and the coal material is 11%;

[0047] c. Catalyst loading: the catalyst solution is atomized, and then contacted with the coated dry coal material obtained in the b step to obtain the catalyst-loaded coal material, wherein the mass percentage of the water added to the atomization and the coal material is 18%, and the catalyst used The mass percent of the quality of...

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Abstract

The invention relates to a method for recycling of a fuel coal catalyst of a chain-grate boiler. The method comprises the steps of coating the outer surface of coal with a coating agent solution, then performing catalyst loading, immersing the coal ash into water after the coal loaded with a catalyst is burnt, and finally filtering and recycling mixed liquor, so as to obtain the catalyst which can be used repeatedly. The method has the benefits that the liquid catalyst is sufficiently utilized, the catalytic combustion effect of a fixed bed fuel coal boiler is greatly improved, the catalyst recovery and recycling rates are correspondingly increased, the efficiency of the fuel coal boiler is further improved, the catalyst cost is reduced, and meanwhile the dust emission during the combustion process is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of coal-fired catalytic combustion, and in particular relates to a method for recycling coal-fired catalysts in chain furnaces. Background technique [0002] The chain furnace is a kind of bed-burning furnace. The combustion of coal in the furnace is completed while moving, but the chain furnace layer combustion process actually belongs to the fixed bed combustion. Because the chain furnace has stable combustion conditions, high thermal efficiency, convenient operation and labor Low strength and low concentration of smoke and dust emission, so chain furnaces have been widely used in industry. At present, there are nearly 500,000 chain furnaces in my country, and their number is increasing at a rate of 7% to 8% per year. [0003] Since the coal particle size used in the chain furnace is 8cm-12cm, and the thickness of the coal seam is 5cm-8cm, the air used in the combustion process is only blown in from the bot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23B30/08C10L9/10
Inventor 栾成文
Owner BEIJING FUYUAN TIANHANG TECH
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