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Method for reducing nitrogen oxides in pulverized coal boilers by using oxygen-enriched micro-oil combustion

A technology of combustion method and pulverized coal boiler, applied in the direction of combustion method, combustion equipment, indirect carbon dioxide emission reduction, etc., can solve the problems of high investment and construction costs, incomplete combustion of pulverized coal, expensive operation costs, etc., to avoid pulverized coal combustion Endless, saving emission reduction costs, reducing fuel consumption

Active Publication Date: 2017-03-15
CHONGQING FURAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Flue gas denitrification (SCR) technology has the best emission reduction effect and can reach the emission reduction target, but the investment and construction costs are high, and the operating costs are expensive, which seriously increases the production cost of power generation enterprises and does not meet the current basic national conditions of our country; air-staged low-nitrogen combustion technology The investment and operation cost of fuel graded low-nitrogen combustion technology are low, but the depth of classification is not enough, the effect is poor, the operation is complicated, and it cannot meet the current national emission standards. Wait for the safety of the boiler
[0010] In addition, for the various low-nitrogen combustion technologies that are currently being implemented, due to the specific national conditions of our country, such as unstable coal types, coal quality fluctuations, large peak-shaving ranges, and human factors in operation, the actual emission reduction operation It is difficult to meet the requirements of low-nitrogen emission reduction of power boilers required by its own theoretical design

Method used

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  • Method for reducing nitrogen oxides in pulverized coal boilers by using oxygen-enriched micro-oil combustion
  • Method for reducing nitrogen oxides in pulverized coal boilers by using oxygen-enriched micro-oil combustion
  • Method for reducing nitrogen oxides in pulverized coal boilers by using oxygen-enriched micro-oil combustion

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Experimental program
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Effect test

Embodiment approach 1

[0033] The following combines the manual with the figure 1 , figure 2 The application of the method of reducing nitrogen oxides in pulverized coal boilers to four-corner tangential combustion boilers by using oxygen-enriched and micro-oil combustion is further explained.

[0034] The primary air powder in the primary air duct 12 passes through the concentration device to separate the primary air powder from thick to thin, so that the ratio of the mass of the dense phase coal powder and the light phase coal powder in the central part of the primary air duct 12 is maintained at 7:3 to 8:2 Between, through oxygen pipeline 13 and fuel oil pipeline 14, pass oxygen and fuel oil respectively to the dense phase pulverized coal of primary air duct 12 central part, the amount of oxygen that feeds according to the change of coal quality (bituminous coal, lean coal, anthracite) is: 10~100m 3 / h, in order to reduce the ignition temperature of the dense phase pulverized coal in the centr...

Embodiment approach 2

[0038] The following combines the manual with the image 3 , Figure 4 The application of the method of reducing nitrogen oxides in pulverized coal boilers to counter-combustion boilers by using oxygen-enriched and micro-oil combustion is further explained.

[0039] The primary air powder in the primary air duct 22 passes through the concentration device to separate the primary air powder from thick to thin, so that the ratio of the mass of dense-phase pulverized coal to the mass of light-phase pulverized coal in the central part of the primary air duct 22 is maintained at 7:3 to 8:2 Between, through oxygen pipeline 23 and fuel oil pipeline 24, feed oxygen and fuel oil respectively to the dense phase pulverized coal of primary air duct 22 central part, the amount of oxygen that feeds according to the change of coal quality (bituminous coal, lean coal, anthracite) is: 10~100m 3 / h, to reduce the ignition temperature of the dense phase pulverized coal in the central part of th...

Embodiment approach 3

[0043] The following combines the manual with the Figure 5 The application of the method of reducing nitrogen oxides in pulverized coal boilers to "W" type combustion boilers by using oxygen-enriched and micro-oil combustion is further explained.

[0044] The primary air powder in the primary air duct 33 passes through the thickening device to separate the primary air powder from thick to thin, so that the ratio of the mass of the dense phase pulverized coal to the mass of the light phase pulverized coal in the central part of the primary air duct 33 is maintained at 7:3 to 8:2 In between, oxygen and fuel are fed into the dense-phase pulverized coal in the central part of the primary air duct 33 through the oxygen pipeline 34 and the fuel pipeline 35 respectively, and the amount of oxygen introduced according to the change of the coal quality is: 10-100m 3 / h, in order to reduce the ignition temperature of the dense phase pulverized coal in the central part of the primary air...

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Abstract

The invention relates to a method for reducing pulverized coal boiler oxynitride by utilizing an oxygen-enriched micro-oil combustion manner. According to the method, a small amount of oxygen and fuel oil is added in pulverized coal flow at the central part of a primary air pipeline during whole-course operational process of a boiler, the ignition combustion temperature of the pulverized coal flow at the central part of the primary air pipeline is lowered by the added oxygen, and the pulverized coal flow at the central part of the primary air pipeline is continuously combusted under the action of the combustion of the small amount of the fuel oil after the pulverized coal flow is on fire.

Description

[0001] Technical field: [0002] The invention relates to a method for reducing nitrogen oxides in pulverized coal boilers by means of oxygen-enriched and micro-oil combustion, in particular to the application in various coal-fired power generation boilers. [0003] technical background: [0004] During the combustion of coal, pollutants such as sulfur dioxide, nitrogen oxides, and dust will be generated. These pollutants have caused great harm to our environment, among which nitrogen oxides (NOx) are the most harmful. How to reduce nitrogen oxides in coal combustion emissions is an important issue that we must face and solve. [0005] In order to solve the problem of nitrogen oxide emissions, various emission reduction methods have been adopted at home and abroad: [0006] Flue gas denitrification (SCR) technology, the principle is to use ammonia as a denitrification agent to be sprayed into a high-temperature flue gas denitrification device, and under the action of a catalys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C7/00F23L9/00
CPCY02E20/34
Inventor 向卫其他发明人请求不公开姓名
Owner CHONGQING FURAN TECH