Coal powder furnace mixed burning gasification coal ash system
By using methods such as slurry preparation in a pulverized coal furnace, pipeline pumping, and high-temperature mixing, the problems of coal mill blockage and corrosion caused by co-firing of gasified coal ash in a pulverized coal furnace were solved, realizing reliable co-firing and resource utilization of gasified coal ash, and improving system stability and environmental protection.
Patent Information
- Application Number
- CN202210092657.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-01-26
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2042-01-26
AI Technical Summary
When gasified coal ash is co-fired in pulverized coal boilers, the segregation and corrosiveness of the gasified coal ash can cause blockage, corrosion, and wear in the coal mill system, affecting operational stability.
The system employs a gasified coal ash slurry preparation unit, a pipeline pumping unit, an incorporation unit, and a furnace combustion unit. A high-pressure plunger pump delivers the gasified coal ash slurry to the pulverized coal pipeline at the rear of the coal mill. The slurry is mixed with pulverized coal by means of high-temperature, high-speed airflow. The control unit operates in coordination to achieve uniform incorporation and combustion of the gasified coal ash within the pulverized coal pipeline.
It eliminates the problems of clogging, corrosion and wear caused by mixing gasified coal ash with coal before entering the coal mill, improves the operational stability of the co-firing system, realizes reliable co-firing and resource utilization of gasified coal ash, saves coal resources and reduces environmental pollution.
Smart Images
Figure CN116538528B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of solid waste disposal, and is a coal powder furnace mixed combustion gasification coal ash system. BACKGROUND
[0002] The gasification coal ash contains a large amount of combustible components and has a certain calorific value, and it is a pity to discard it without use. A large amount of gasification coal ash is piled up in the open air, which causes serious pollution to the environment.
[0003] At present, there are successful applications of using a circulating fluidized bed boiler to mix and burn the calorific value of gasification coal ash, and there are also uses of a coal powder furnace to mix and burn gasification coal ash. However, the coal powder furnace mixed combustion gasification coal ash has problems. After the gasification coal ash is mixed with the coal and enters the coal mill, due to the special properties of the gasification coal ash, such as easy segregation, corrosion and abrasion, the coal mill system is easily blocked, corroded and worn, thereby affecting the stability of the operation of the coal powder furnace.
[0004] The coal powder furnace is a boiler equipment using pulverized coal as fuel, which has the advantages of rapid and complete combustion, large capacity, high efficiency, wide adaptability to coal types, and easy control and adjustment. Pulverized coal combustion is widely used in the thermal power industry, and is almost the combustion mode of all large coal-fired boilers.
[0005] The coal powder furnace mixed combustion gasification coal ash not only can turn waste into treasure and save coal resources on a large scale, but also can recycle the gasification coal ash and reduce environmental pollution.
[0006] In order to solve the above problems of the prior art, it is necessary to study a coal powder furnace mixed combustion gasification coal ash system. SUMMARY
[0007] An object of the present application is to provide a coal powder furnace mixed combustion gasification coal ash system, which can realize the coal powder furnace mixed combustion gasification coal ash.
[0008] The present application provides a coal powder furnace mixed combustion gasification coal ash system, which comprises: a gasification coal ash pulping unit, which removes impurities from the gasification coal ash and adjusts it into slurry to meet the characteristics requirements of pipeline pumping and combustion; a gasification coal ash pipeline pumping unit, which uses a high-pressure plunger pump to transport the gasification coal ash slurry to the rear end of the pulverized coal outlet of the coal mill through a sealed pipeline; a gasification coal ash mixing unit, which injects the gasification coal ash slurry into the pulverized coal pipeline connected between the pulverized coal outlet of the coal mill and the boiler burner in an injection manner, and mixes the gasification coal ash slurry with the pulverized coal uniformly in the pulverized coal pipeline with the help of high-temperature high-speed airflow; a gasification coal ash into-furnace combustion unit, which mixes the gasification coal ash with the pulverized coal and then enters the furnace from the side combustion lance of the coal powder furnace for combustion; and a control unit, which is used to control the gasification coal ash pulping unit, the gasification coal ash pipeline pumping unit, the gasification coal ash mixing unit and the gasification coal ash into-furnace combustion unit.
[0009] As an embodiment of the present application, the gasification coal ash is a viscous waste with a water content of 40%-70% generated in a coal chemical production process.
[0010] As a preferred embodiment of the present application, the gasification coal ash is mixed with the pulverized coal in the pulverized coal pipeline by means of the high-temperature and high-speed airflow in the pipeline.
[0011] As a preferred embodiment of the present application, the gasification coal ash is mixed with the pulverized coal in the pulverized coal pipeline by means of the high-temperature and high-speed airflow in the pipeline.
[0012] As a preferred embodiment of the present application, the gasification coal ash slurry injection pipeline and the pulverized coal pipeline axis form an inclined angle of 15-60 degrees.
[0013] As an embodiment of the present application, the gasification coal ash mixing ratio is 10%-30%.
[0014] Compared with the prior art, the present application has the following beneficial effects:
[0015] 1. By using the present application, the gasification coal ash is mixed and burned in the pulverized coal furnace, and does not need to be dried and aired separately, but can be directly pumped by a pipeline and injected into the pulverized coal pipeline and then burned in the furnace. The gasification coal ash mixing ratio is 10%-30%, and significant economic benefits are achieved.
[0016] 2. By using the present application, the gasification coal ash is uniformly mixed with the pulverized coal in the pulverized coal pipeline and then enters the pulverized coal furnace to achieve full combustion, and reliable mixing and burning of the gasification coal ash is achieved.
[0017] 3. By using the present application, the gasification coal ash is mixed and burned in the pulverized coal furnace, and the gasification coal ash does not mix with the coal and enter the coal mill, but the coal alone enters the coal mill, so that the gasification coal ash does not enter the coal mill and is mixed with the pulverized coal in the pulverized coal pipeline after the back end of the pulverized coal outlet of the pulverized coal furnace. The system blockage, corrosion and wear problems caused by the mixing of the gasification coal ash and the coal entering the coal mill are eliminated, and the operation stability and reliability of the mixing and burning system are improved.
[0018] 4. The present application realizes the resource utilization of the gasification coal ash solid waste, not only saves a large amount of boiler coal resources, but also has obvious energy saving and emission reduction effect, and disposes the gasification coal ash at a lower cost and in a more environmentally friendly manner than the prior art, and eliminates the pollution of the waste to the environment. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 is a schematic diagram of a pulverized coal furnace mixed with gasification coal ash according to the present application. DETAILED DESCRIPTION
[0020] The best mode for carrying out the present application will now be described in connection with the preferred embodiments with reference to the drawings, and the specific embodiments here are to explain the present application in detail, and should not be construed as limiting the present application, and various modifications and changes can be made without departing from the spirit and essential characteristics of the present application, and these should be included in the scope of protection of the present application.
[0021] The present application provides a pulverized coal furnace mixed combustion gasification coal ash system. Figure 1 As shown, the pulverized coal furnace mixed combustion gasification coal ash system of the present application comprises a gasification coal ash pulping unit, which removes impurities from the gasification coal ash and adjusts it into slurry to meet the characteristics requirements of pipeline pumping and combustion; a gasification coal ash pipeline pumping unit, which uses a high-pressure plunger pump to transport the gasification coal ash slurry through a closed pipeline to the rear end of the coal pulverizer outlet; a gasification coal ash mixing unit, which injects the gasification coal ash slurry into the pulverized coal pipeline connected between the coal pulverizer outlet and the boiler burner, and uniformly mixes the gasification coal ash with the pulverized coal in the pulverized coal pipeline with the help of high-temperature high-speed airflow; a gasification coal ash into-furnace combustion unit, which enters the furnace from the side combustion lance of the pulverized coal furnace after mixing with the pulverized coal; and a control unit for controlling the gasification coal ash pulping unit, the gasification coal ash pipeline pumping unit, the gasification coal ash mixing unit, and the gasification coal ash into-furnace combustion unit.
[0022] The gasification coal ash of the present application does not enter the coal pulverizer, and the coal is transported into the coal pulverizer through an independent channel. The pretreated and pulped gasification coal ash is transported to the rear end of the coal pulverizer by a high-pressure plunger pump through a closed pipeline, and is injected into the pulverized coal pipeline connected between the coal pulverizer outlet and the boiler burner.
[0023] The gasification coal ash of the present application is uniformly mixed with the pulverized coal in the pulverized coal pipeline with the help of high-temperature high-speed airflow in the pipeline.
[0024] The gasification coal ash slurry injection pipe of the present application forms an inclined angle of 15-60 degrees with the axis of the pulverized coal pipeline.
[0025] The gasification coal ash referred to in the present application is a viscous waste with a water content of 40%-70% generated in the coal chemical production process. It can also be municipal sludge with a water content of 60%-85%, or oil-containing sludge with a water content of 60%-85%.
[0026] The pulverized coal furnace mixed combustion gasification coal ash system of the present application does not require drying and airing, and can realize reliable mixed combustion of gasification coal ash, thereby achieving significant economic benefits.
[0027] The pulverized coal furnace mixed combustion gasification coal ash system of the present application has a gasification coal ash mixed combustion ratio of 10%-30%.
[0028] Preferably, the gasification coal ash slurry is injected into the pulverized coal pipeline connected between the coal pulverizer outlet and the boiler burner.
[0029] Preferably, the gasification coal ash slurry is mixed uniformly with the pulverized coal in the pulverized coal pipeline by means of the high-temperature high-speed airflow in the pipeline.
[0030] Preferably, the gasification coal ash slurry injection pipe is at an oblique angle of 15-60 degrees with the axis of the pulverized coal pipeline.
[0031] The gasification coal ash does not enter the coal mill, the coal is fed into the coal mill through an independent channel, the pretreated gasification coal ash slurry is transported to the rear end of the coal mill by a high-pressure piston pump through a sealed pipeline, and is injected into the pulverized coal pipeline connected between the pulverized coal outlet of the coal mill and the boiler burner.
[0032] In summary, the beneficial effects of the present application are as follows:
[0033] The coal powder furnace gasification coal ash blending system of the present application can directly blend and burn the gasification coal ash without separate drying and airing, and the blending ratio of the gasification coal ash is 10%-30%, which has significant economic benefits.
[0034] The coal powder furnace gasification coal ash blending system of the present application realizes reliable blending and burning of the gasification coal ash.
[0035] The coal powder furnace gasification coal ash blending system of the present application realizes reliable blending and burning of the gasification coal ash.
[0036] The present application realizes resource utilization of the gasification coal ash solid waste, not only saving a large amount of boiler coal resources, but also having obvious energy-saving and emission-reducing effects, and disposing of the gasification coal ash in a more environmentally friendly and lower-cost manner than the prior art, thereby eliminating the pollution of these wastes to the environment.
[0037] The present application is not limited to the above specific embodiments. It can be understood that various modifications and changes can be made without departing from the spirit and essential characteristics of the present application, and these should be included in the protection scope of the present application.
Claims
1. A pulverized coal boiler mixed combustion gasification coal ash system, characterized in that, The application relates to a gasification coal ash mixing and burning system, which comprises the following units: a gasification coal ash slurry preparation unit, which is used for removing impurities from gasification coal ash and adjusting the gasification coal ash into slurry so as to meet the requirements of pipeline pumping and burning; a gasification coal ash pipeline pumping unit, which is used for conveying the gasification coal ash slurry to the rear end of a pulverized coal outlet of a coal mill through a closed pipeline by using a high-pressure plunger pump; a gasification coal ash mixing unit, which is used for mixing the gasification coal ash slurry into pulverized coal in a pulverized coal pipeline by means of high-temperature and high-speed airflow; a gasification coal ash burning unit, which is used for burning the mixed gasification coal ash and pulverized coal in a pulverized coal pipeline; and a control unit, which is used for controlling the above-mentioned units. The gasification coal ash is viscous waste with a water content of 40%-70% generated in a coal chemical production process.
2. The system for burning gasified coal ash in a pulverized coal boiler according to claim 1, wherein The gasification coal ash slurry is injected into the pulverized coal pipeline at a position between a pulverized coal outlet of a coal mill and a burner of a coal-fired boiler.
3. The system for burning gasified coal ash in a coal-fired boiler according to claim 1, wherein The injection pipe of the gasification coal ash slurry is inclined to the axis of the pulverized coal pipeline at an angle of 15-60 degrees.
4. The system for burning gasified coal ash in a pulverized coal boiler according to claim 1, wherein The gasification coal ash slurry is not fed into the coal mill, and the coal is fed into the coal mill through an independent channel.
5. The system for burning gasified coal ash in a pulverized coal boiler according to claim 1, wherein The mixing and burning ratio of the gasification coal ash is 10%-30%.
6. The system for burning gasified coal ash in a pulverized coal boiler according to claim 1, wherein
Citation Information
Patent Citations
Process and system for mixed burning of coal slime in big proportion in coal-powder boiler
CN106642185A
Blending combustion system for gasified coal ash in pulverized coal furnace
CN214700780U