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Method and device for preparing sodium carbonate by recycling tail gas of coal-fired boiler

A technology for a coal-fired boiler and a waste heat recovery device, which is applied in separation methods, chemical instruments and methods, fuels, etc., can solve the problem of not being able to fundamentally solve the problem of environmental pollution caused by a large amount of carbon dioxide emissions, and improve the utilization rate of raw materials and combustion efficiency. , the effect of reducing consumption

Inactive Publication Date: 2013-02-20
GUANGDONG DAZHONG AGRI SCI CO LTD
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Problems solved by technology

[0003] In order to protect the environment on which human beings depend, our country has invested a lot of manpower and material resources to remediate the tail gas of coal-fired boilers, but the existing control and reduction of sulfur dioxide and carbon dioxide The main method of desulfurization and dust is to treat the sulfur dioxide in the tail gas through dry or wet desulfurization technology, and reduce carbon dioxide emissions by improving the combustion method of the boiler and improving the combustion efficiency of the boiler. However, the above methods will still produce a large amount of carbon dioxide. Unable to fundamentally solve the problem of massive emissions of carbon dioxide and environmental pollution

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  • Method and device for preparing sodium carbonate by recycling tail gas of coal-fired boiler

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Embodiment 1

[0057] Such as figure 1 Shown, the method for the recovery and utilization of coal-fired boiler tail gas of the present invention to prepare soda ash may further comprise the steps:

[0058] Step (1): Pulverize the coal used in the coal-fired boiler 1 and add a desulfurizer to obtain desulfurized coal and put it into the boiler 1 for combustion; treat the coal before combustion so that the sulfur-containing substances after combustion in the boiler 1 remain In the ash, the content of sulfur dioxide in the tail gas discharged from the boiler 1 can be effectively reduced, and the pollution to the environment can be reduced.

[0059] Further, the air inlet 12 of the boiler 1 is provided with a membrane filter device 7, the membrane filter device 7 is an oxygen-enriched membrane filter device 7, and the membrane separation layer of the oxygen-enriched membrane filter device 7 can allow oxygen to pass through and prevent Nitrogen passes through, so the concentration of oxygen ent...

Embodiment 2

[0072] The method for preparing soda ash by recovering and utilizing tail gas of coal-fired boiler 1 of the present invention comprises the following steps:

[0073] Step (1): Pulverize the coal used in the coal-fired boiler 1 and add a desulfurizer to obtain desulfurized coal and put it into the boiler 1 for combustion; treat the coal before combustion so that the sulfur-containing substances after combustion in the boiler 1 remain In the ash, the content of sulfur dioxide in the tail gas discharged from the boiler 1 can be effectively reduced, and the pollution to the environment can be reduced.

[0074] Further, the air inlet of the boiler 1 is provided with a membrane filter device 7, the membrane filter device 7 is an oxygen-enriched membrane filter device 7, and the membrane separation layer of the oxygen-enriched membrane filter device 7 can allow oxygen to pass through and prevent nitrogen Therefore, it is possible to increase the concentration of oxygen entering the b...

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Abstract

The invention relates to a method and a device for preparing sodium carbonate by recycling tail gas of a coal-fired boiler. The method comprises the steps of mixing coals and a desulfurizing agent to prepare desulfurized coals, and feeding the desulfurized coals into the boiler for burning; recycling waste heat of the tail gas; conducting dust removal on the tail gas; collecting and compressing the tail gas; and introducing the compressed tail gas into a reaction tank for chemical reaction to prepare sodium carbonate. According to the method, not only can the tail gas of the coal-fired boiler be treated, the pollution on the environment is alleviated, but also carbon dioxide in the tail gas can be used as a raw material to prepare sodium carbonate, so that the method has a good popularization and application value and a good commercial value. The device provided by the invention comprises a waste heat recovery device, a dust removal device, a compressor, the reaction tank and a sodium carbonate recovery system, wherein the waste heat recovery device is connected with an exhaust port of the coal-fired boiler, and a film filter device is arranged on a gas inlet of the boiler. The device is simple in structure, high in fuel burning efficiency, low in environmental pollution, beneficial to environmental protection and strong in practicability.

Description

technical field technical field [0001] The invention belongs to the technical field of recovery and reuse of flue waste gas, and in particular relates to a method and a device for preparing soda ash by recycling the tail gas of a coal-fired boiler. Background technique [0002] With the rapid development of global industry and the excessive development and utilization of coal resources by human beings, a large amount of dust, sulfide, carbon dioxide, etc. generated during the combustion of coal have caused great pollution to the environment, which is harmful to human living environment and human health. had a serious impact. 85% of coal in my country is directly burned by coal-fired boilers, mainly including thermal power generation, industrial boiler (kiln) furnace, civil heating and household stoves, etc. This high-consumption and low-efficiency coal combustion method emits a large amount of air into the air. The pollution caused by sulfur dioxide and soot is particular...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/62B01D46/02C10L9/10C01D7/12C01D7/18
CPCY02P20/10Y02P20/129Y02P20/50
Inventor 林小明
Owner GUANGDONG DAZHONG AGRI SCI CO LTD
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