Method and system for efficiently controlling mercury pollution of coal-fired power plant at low cost

A technology for coal-fired power plants and control methods, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve problems such as low halogen content, no removal of elemental mercury, and poor oxidation effect, and achieve investment costs and operation The effect of low cost, efficient mercury pollution control, and simple dosing equipment

Inactive Publication Date: 2012-02-08
HUANENG CLEAN ENERGY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The desulfurization system can achieve efficient removal of oxidized mercury, but has little effect on the removal of elemental mercury
The denitrification system can oxidize the elemental mercury in the flue gas, but when the halogen content in the flue gas is low, the oxidation effect is poor
[0007] Therefore, the collaborative mercury removal technology has a better removal effect on oxidized mercury and particulate mercury, but poor remo

Method used

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  • Method and system for efficiently controlling mercury pollution of coal-fired power plant at low cost
  • Method and system for efficiently controlling mercury pollution of coal-fired power plant at low cost
  • Method and system for efficiently controlling mercury pollution of coal-fired power plant at low cost

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1As shown, a high-efficiency and low-cost coal-fired power plant mercury pollution control system includes a secondary air hot air pipeline 7 communicated with the boiler body 6, the secondary air hot air pipeline 7 communicates with the air preheater 15, and also includes a The primary air hot air pipeline 11 connected to the heater 15, the primary air hot air pipeline 11 communicates with the coal mill 10, the coal mill 10 communicates with the boiler body 6, and the coal conveying system 2 communicates with the coal mill 10 through the coal feeder 3 for Coal is supplied to the coal mill 10, and the air preheater 15 is connected with a primary fan 12 and a secondary fan 13, which supply air to the primary air hot air pipeline 11 and the secondary air hot air pipeline 7 respectively, and the outlet of the boiler body 6 and the air preheater A denitrification system 14 is set between the heaters 15, and the air preheater 15 is connected to the dust remove...

Embodiment 2

[0038] Such as figure 2 As shown, a high-efficiency and low-cost coal-fired power plant mercury pollution control system includes a secondary air hot air pipeline 7 communicated with the boiler body 6, the secondary air hot air pipeline 7 communicates with the air preheater 15, and also includes a The primary air hot air pipeline 11 connected to the heater 15, the primary air hot air pipeline 11 communicates with the coal mill 10, the coal mill 10 communicates with the boiler body 6, and the coal conveying system 2 communicates with the coal mill 10 through the coal feeder 3 for Coal is supplied to the coal mill 10, and the air preheater 15 is connected with a primary fan 12 and a secondary fan 13, which supply air to the primary air hot air pipeline 11 and the secondary air hot air pipeline 7 respectively, and the outlet of the boiler body 6 and the air preheater A denitrification system 14 is installed between the heaters 15, and the air preheater 15 is connected to the dus...

Embodiment 3

[0043] Such as image 3 As shown, a high-efficiency and low-cost coal-fired power plant mercury pollution control system includes a secondary air hot air pipeline 7 communicated with the boiler body 6, the secondary air hot air pipeline 7 communicates with the air preheater 15, and also includes a The secondary air branch pipe 21 connected to the heater 15 and the secondary air hot air pipeline 7, the secondary air branch pipe 21 is connected to the coal mill 10, the coal mill 10 is connected to the boiler body 6, and the coal conveying system 2 is connected to the coal feeder 3 The coal mill 10 is used to supply coal to the coal mill 10. The coal mill 10 communicates with the coal powder bin 20 through the pulverized coal separator 19. The pulverized coal bin 20 communicates with the boiler body 6. The pulverized coal bin 20 passes through the primary air hot air The pipeline 11 communicates with the air preheater 15, and the air preheater 15 is connected with a primary fan 1...

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Abstract

The invention discloses a method and system for efficiently controlling mercury pollution of a coal-fired power plant at low cost. The system comprises a primary hot air duct, a secondary hot air duct and a liquid storing tank, wherein the primary hot air duct and the secondary hot air duct are communicated with an air preheater and a hearth; a coal conveying system is communicated with a coal grinding system through a coal feeder; the liquid storing tank is filled with a halide additive solution; and the liquid storing tank is communicated with at least one of the coal conveying system, the coal feeder, the primary hot air duct and the secondary hot air duct. According to the system, the halide additive solution enters a boiler body and participates in a combustion reaction, the oxidation of the mercury in flue gas is promoted and the ratio of mercury oxide in the flue gas is increased, so that the synergetic demercuration effect of flue gas purifying equipment such as denitration equipment, desulfurization equipment, dedusting equipment and the like in a tail flue of a boiler is improved, and the mercury content of flue gas in a chimney is greatly lowered. A mercury pollutant control system has the advantages of small investment and low running cost while the mercury pollutant emission level of the coal-fired power plant can meet stricter environmental standard requirements.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to a pollution control method of a coal-fired power plant, in particular to a high-efficiency and low-cost coal-fired power plant mercury pollution control method and system. Background technique [0002] Mercury is a highly toxic substance that will cause long-term and serious harm to the environment and human body. The global mercury emissions from coal combustion account for about 2 / 3 of the anthropogenic mercury emissions. As a large coal consumption country, China has more severe mercury emissions and pollution caused by coal combustion. Therefore, my country has included mercury pollution control work in the "Twelfth Five-Year Plan for Prevention and Control of Heavy Metal Pollution", and initially proposed that mercury and its compounds emitted by coal-fired power plants must be less than 0.03mg / m 3 emission limit requirements. [0003] At present, a series o...

Claims

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Application Information

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IPC IPC(8): B01D53/64
Inventor 胡式海肖平江建忠钟犁
Owner HUANENG CLEAN ENERGY RES INST
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