Method for improving pulverized coal combustion performance and reducing NOx generation under O2/CO2 atmosphere

A pulverized coal combustion and CO2 technology, which is applied in combustion methods, combustion equipment, block/powder supply/distribution, etc., can solve the problems of incomplete combustion and unstable combustion, and achieve improved combustion performance and low NOx emissions. , to achieve the effect of NOx emission

Active Publication Date: 2013-02-06
马鞍山市安工大智能装备技术研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the pulverized coal in the prior art in O 2 / CO 2 Combustion in the atmosphere is prone to unstable combustion, incomplete combustion, and NO x generation problem, providing a way to improve O 2 / CO 2 Combustion performance of pulverized coal under atmosphere and reduction of NO x method of generation, the present invention does not increase the O 2 / CO 2 Middle O 2 Under the premise of high concentration, the mixed combustion process of ultra-fine coal powder and ordinary particle size coal powder not only improves the combustion characteristics of coal powder itself, but also suppresses the NO x generation

Method used

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  • Method for improving pulverized coal combustion performance and reducing NOx generation under O2/CO2 atmosphere
  • Method for improving pulverized coal combustion performance and reducing NOx generation under O2/CO2 atmosphere
  • Method for improving pulverized coal combustion performance and reducing NOx generation under O2/CO2 atmosphere

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Embodiment 1

[0021] The ultra-fine pulverized coal in this embodiment adopts the Shenhua coal whose average particle diameter is 20 microns, and the ordinary particle diameter coal powder adopts the Shenhua coal whose average particle diameter is 74 microns. The industrial analysis of Shenhua Coal is shown in Table 1.

[0022] Table 1 Industrial Analysis of Shenhua Coal (mass / %)

[0023] name moisture Ash Volatile matter fixed carbon Shenhua Coal (SH) 4.80 5.00 31.90 58.30

[0024] Select 10% (mass percentage) of ultra-fine pulverized coal of this embodiment and 90% (mass percentage) of ordinary particle size pulverized coal in O 2 / CO 2 Mixed combustion under atmosphere, where O 2 / CO 2 O in the atmosphere 2 The mass percentage is 23.3%.

Embodiment 2

[0026]The average particle diameter that adopts in the present embodiment is that the superfine coal powder of 20 microns and the common particle diameter coal powder of 74 microns are the same as embodiment 1, and the difference is: in the present embodiment, the superfine coal powder 30% (mass percentage) and ordinary particle size pulverized coal 70% (mass percentage) in O 2 / CO 2 Mixed combustion under the atmosphere.

[0027] The combustion characteristic parameters of Example 1 and Example 2 are shown in Table 2, wherein the comparative example adopts the ordinary particle size coal powder combustion test with an average particle size of 74 microns.

[0028] Table 2 Combustion characteristic parameters of pulverized coal under different mixing ratios

[0029]

[0030] From the combustion characteristic parameters in Table 2, it can be seen that when 10% (mass percentage) ultra-fine coal powder is added to the ordinary particle size coal powder with an average part...

Embodiment 3

[0034] In this embodiment, a pulverized coal burner (such as figure 2 As shown), the combustion process of the internal mixed pulverized coal is calculated and studied, in which the primary air carries the pulverized coal and is injected into the combustion chamber, and there is secondary air to support the combustion. In this embodiment, 10% (mass percentage) of ultra-fine coal powder with an average particle size of 20 μm and 90% (mass percentage) of ordinary particle size coal powder with an average particle size of 70 μm are mixed in O 2 / CO 2 Mixed combustion under the atmosphere. The analysis of coal powder composition is shown in Table 3. The combustion conditions are shown in Table 4.

[0035] Coal type composition analysis in table 3 embodiment 3

[0036]

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Abstract

The invention discloses a method for improving pulverized coal combustion performance and reducing NOx generation under O2 / CO2 atmosphere, belonging to the field of high-efficiency low-pollution combustion of pulverized coal. The method comprises the steps that ultrafine pulverized coal with the mean grain size of less than 20microns and common grain size pulverized coal with the mean grain size of 70 to 90microns under the O2 / CO2 atmosphere are mixed and combusted, wherein the mixing mass percent of the ultrafine pulverized coal is 10 to 40 percent, and the mass percent of volatile components in the ultrafine pulverized coal is more than 15 percent; and the ultrafine pulverized coal and the common grain size pulverized coal are mixed and combusted under the condition that the O2 concentration in the O2 / CO2 is not increased, so that the temperature of ultrafine pulverized coal particles is rapidly raised, the volatile components in the ultrafine pulverized coal are rapidly separated out, a high reducing atmosphere is formed around the pulverized coal, the oxygen is consumed, and a local low-oxygen area is formed; and therefore, the combustion characteristics of the pulverized coal are improved, the NOx generation in the pulverized coal combustion process is suppressed, and the operating cost is greatly lower than the operating cost of total ultrafine pulverized coal combustion.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency and low-pollution combustion of pulverized coal, and more specifically relates to a 2 / CO 2 Combustion performance of pulverized coal under atmosphere and reduction of NO x generated method. Background technique [0002] reduce CO 2 and NO x emissions have become a common concern around the world. In recent years, O 2 / CO 2 Pulverized coal combustion technology is considered to be a method capable of simultaneously controlling CO 2 , SO 2 and NO x The new combustion technology of the three pollutants has attracted great attention from academic and industrial circles at home and abroad. However, the study found that pulverized coal in O 2 / CO 2 Combustion in the atmosphere is prone to unstable combustion and incomplete combustion. Therefore, this technology is still in the research stage and has not been widely used. [0003] In order to improve pulverized coal in O 2 / CO ...

Claims

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Application Information

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IPC IPC(8): F23K3/00
Inventor 顾明言马标张雨航刘旭辉
Owner 马鞍山市安工大智能装备技术研究院有限公司
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