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Coal combustion process and combustion furnace thereof

A combustion furnace and process technology, applied in steam boilers, steam generation, lighting and heating equipment, etc., can solve the problems of low cycle efficiency, complex equipment, high cost, etc., achieve high combustion temperature, small equipment investment, and small footprint Effect

Active Publication Date: 2017-06-13
云南大为制焦有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Current boilers mainly use circulating fluidized bed boilers, which have low cycle efficiency; IGCC needs to be gasified first to produce combustible gas which is purified and then enters the internal combustion engine. The equipment is complex and the investment is high.
Oxygen-enriched combustion is currently used because of the high production cost of oxygen. Oxygen-enriched combustion uses oxygen-enriched air with a higher oxygen concentration than normal air (21% oxygen) for combustion. In order to control the flame temperature in the furnace and maintain proper heat transfer characteristics, part of the flue gas is required to be recirculated, which not only increases the circulation machine but also produces NOX during combustion

Method used

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  • Coal combustion process and combustion furnace thereof
  • Coal combustion process and combustion furnace thereof
  • Coal combustion process and combustion furnace thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0025] Embodiment one kind of combustion process of coal, comprises the following steps:

[0026] The first step is to spread the coal in the residual charcoal combustion chamber; the boiler feed water enters the boiler feed water preheater and the heat exchange pipe of the water wall to keep the pipe in a water-filled state, and the steam vent valve is vented; the return valve is closed;

[0027] Step 2: Pass the process air through the oxygen nozzle, and turn on the induced draft fan to ensure the slight positive pressure in the furnace.

[0028] Step 3: Use start-up gas to raise the temperature in the middle of the furnace to 750°C, and raise the temperature at the bottom of the furnace to 650~850°C; feed coal from the raw coal pipeline, and close the start-up gas after most of the coal in the furnace is ignited. Reduce coal and control the temperature of the combustion furnace at 800~900°C. After ensuring the heat storage and culture material layer in the furnace, inject s...

Embodiment approach 2

[0033] Embodiment 2, based on Embodiment 1, as a preference, the third step ensures that the oxygen content in the combustion chamber is between 85% and 100%.

Embodiment approach 3

[0034] Embodiment 3, based on Embodiment 2, as a preference, the third step ensures that the oxygen content in the combustion chamber is 95%.

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Abstract

A coal combustion process and its combustion furnace. The equipment of the present invention uses pure oxygen to react with coal as fuel, and uses the micro-negative pressure of the furnace to control the combustion temperature in the furnace to avoid energy loss caused by flue gas circulation and the impact on the furnace due to circulation. The wear of the wall is relatively serious; compared with the current circulating fluidized bed boiler, IGCC and oxygen-enriched combustion process, the equipment investment is small, the floor space is small, the structure is simple, the combustion temperature is high, and the environment and carbon emissions are small.

Description

technical field [0001] The invention relates to a coal combustion process and a combustion furnace thereof. Background technique [0002] At present, the boilers mainly use circulating fluidized bed boilers, which have low cycle efficiency; IGCC needs to be gasified first to produce combustible gas which is purified and then enters the internal combustion engine. The equipment is complex and the investment is high. Oxygen-enriched combustion is currently used because of the high production cost of oxygen. Oxygen-enriched combustion uses oxygen-enriched air with a higher oxygen concentration than normal air (21% oxygen) for combustion. In order to control the flame temperature in the furnace and maintain proper heat transfer Characteristics, part of the flue gas needs to be recirculated, which not only increases the circulation machine but also produces NOX during combustion. [0003] At present, the innovation of oxygen production technology has reduced the cost of oxygen p...

Claims

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Application Information

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IPC IPC(8): F22B31/00
Inventor 晏廷书杨忠明
Owner 云南大为制焦有限公司
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