Exhaust gas and hot-blast air dual-medium powder feeding system

A technology of hot air and powder feeding, applied in the field of coal-fired boilers, can solve the problems of high NOx emission and easy slagging of boilers, and achieve the effects of reducing NOx generation, less investment and convenient adjustment

Active Publication Date: 2010-06-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems caused by the tertiary air such as high NOx emission and easy slagging in the boiler of the exist

Method used

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  • Exhaust gas and hot-blast air dual-medium powder feeding system
  • Exhaust gas and hot-blast air dual-medium powder feeding system
  • Exhaust gas and hot-blast air dual-medium powder feeding system

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0015] Specific implementation mode one: see Figure 2-5 , The exhaust gas and hot air dual-medium powder feeding system described in this embodiment includes a powder discharger 21, a tertiary air pipeline 26, a tertiary air pipeline control valve 32, an air powder mixer 18, a exhaust air bellows 20, a hot air pipeline 28, a primary Air pipeline 29, primary air pipeline control valve 31 and primary air powder delivery pipeline 30, described powder delivery system also includes exhaust pipeline fast shut-off valve 25, exhaust pipeline 27 and exhaust gas hot-air mixer 33, described tertiary air The inlet end of the pipeline 26, the inlet end of the exhaust gas pipeline 27 are all connected with the output end of the powder discharger 21, the outlet end of the tertiary air pipeline 26 is connected with the tertiary air nozzle 24 on the boiler 1, and the tertiary air pipeline 26 is provided with exhaust Air wind box 20; the outlet end of the hot blast pipeline 28 communicates wit...

specific Embodiment approach 2

[0017] Specific implementation mode two: see Figure 3-5 , the exhaust air hot air mixer 33 in this embodiment is composed of an exhaust air nozzle 33-1, a hot air pipe 33-2, a mixing pipe 33-3 and a closed hot air receiving chamber 33-4, and the exhaust air nozzle 33-1 One end of the mixing tube 33-3 is inserted into the airtight hot blast receiving chamber 33-4, the mixing tube 33-3 is coaxially arranged opposite to the exhaust nozzle 33-1 and one end of the mixing tube 33-3 communicates with the airtight hot blast receiving room 33-4, and the hot blast tube One end of 33-2 communicates with the airtight hot air receiving chamber 33-4. The other end of the exhaust air nozzle 33-1 communicates with the exhaust air pipeline 27, and the other end of the mixing tube 33-3 and the other end of the hot air pipe 33-2 communicate with the primary air pipeline 29. The design of the exhaust air hot blast mixer 33 adopts the ejector principle. The exhaust air ejected from the exhaust ...

Embodiment 1

[0019] Example 1: The boiler has two layers of primary air burners and is equipped with two sets of pulverizing systems. Each system includes raw coal bunkers, coal feeders, coal mills, coarse powder separators, fine powder separators, powder exhausters and various pipelines. Both sets of milling systems are in normal operation. combined with figure 2 This embodiment will be described. The dual-medium powder feeding system of exhaust air and hot air includes a control valve 25 , an exhaust air pipeline 27 , a hot air pipeline 28 , a primary air pipeline 29 , and a primary air powder supply pipeline 30 . Close the original tertiary air control valve, open the control valve of the exhaust air pipeline, supply the exhaust air at the outlet of the powder discharger into the primary air pipeline, and adjust the hot air control valve of the primary air pipeline according to the primary wind speed to achieve the mixture of exhaust air and hot air The purpose of sharing fans. The...

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Abstract

The invention relates to a powder feeding system, in particular to an exhaust gas and hot-blast air dual-medium powder feeding system, which belongs to the technical field of coal-fired boilers. The powder feeding system solves the problems of high NOx discharge amount, easy scorification and the like which exist in the conventional hot-blast air powder feeding system boiler. One end of a tertiary air pipeline and one end of an exhaust gas pipeline are communicated with the output end of a mill exhauster; the other end of the tertiary air pipeline is communicated with a tertiary air nozzle on a boiler; an exhaust air bellow is arranged on the tertiary air pipeline; the outlet end of a hot-blast air pipeline and the other end of the exhaust gas pipeline are communicated with one end of a primary air pipeline; the other end of the primary air pipeline is communicated with an inlet of an air-powder mixer; and an outlet of the air-powder mixer is communicated with one end of a primary air powder feeding pipeline. The dual-medium powder feeding system can reduce the amount of air supplied to a main combustor area substantially; and the original tertiary air quantity of the main combustor area is supplied by a burn-out air nozzle of the upper part, so that the powder feeding system effectively ensures that the main combustor area operates under the condition of low excess air coefficients and the NOx production is reduced substantially.

Description

technical field [0001] The invention relates to a powder feeding system, in particular to a dual-medium powder feeding system of exhaust gas and hot air, which belongs to the technical field of coal-fired boilers. Background technique [0002] Some existing pulverized coal boilers in power plants in my country widely use intermediate pulverized coal bunkers and hot air powder feeding systems when burning bituminous coal, lean coal and anthracite (see figure 1 ), in these boilers, the exhaust gas is used as the tertiary air, which is usually arranged on the uppermost layer of the burner, and the primary and secondary air nozzles are arranged below it. The air volume of the tertiary air is about 15-20% of the total air volume, which contains 10-15% coal powder. [0003] The use of tertiary air has an impact on the NOx emission level at the boiler tail. When the tertiary air is sprayed into the furnace, the excess combustion air coefficient in the nozzle area is high, often a...

Claims

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Application Information

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IPC IPC(8): F23K3/02
Inventor 孙锐孙绍增赵义军王正阳秦香彬廖坚
Owner HARBIN INST OF TECH
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