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A method, device and automatic control system for determining the amount of oxygen in boiler operation

A technology for boiler operation and operating oxygen content, which is applied in the combustion method, combustion control, lighting and heating equipment, etc., to achieve the effect of high-efficiency combustion of NOx concentration

Active Publication Date: 2017-12-15
NORTH CHINA ELECTRICAL POWER RES INST +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention solves the existing low NO x Combustion technology cannot maintain a low level of NO at the furnace outlet while ensuring high-efficiency combustion x Concentration problem, and then proposed a method, device and automatic control system for determining the amount of oxygen in boiler operation, specifically including the following technical solutions:

Method used

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  • A method, device and automatic control system for determining the amount of oxygen in boiler operation
  • A method, device and automatic control system for determining the amount of oxygen in boiler operation
  • A method, device and automatic control system for determining the amount of oxygen in boiler operation

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Embodiment 1

[0043] exist image 3 Under the predetermined steady load shown, the CO concentration in the flue gas at the denitrification inlet (the unit of CO concentration is mg / m 3 ) and NO x Concentration (NO x The unit of concentration is mg / m 3 ) and the operating oxygen amount (that is, the oxygen content, the unit is ％ ) is shown in the table below. According to CO less than 600mg / m 3 The principle of filtering out the first five rows of data, and calculating the corresponding k j Values ​​are shown in the last column of the table, in order of k j The principle of minimum determines that the optimal operating oxygen level under this load is 3.25%.

[0044]

[0045] for Figure 4 The best operating oxygen curve of a boiler with a capacity of 2000t / h is shown, and the main steam flow of the boiler is the boiler load. Example of interpolation by finding optimal operating oxygen for any boiler load. For example: the current boiler load (main steam flow) is 1200t / h, at Figu...

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Abstract

The invention provides a method and device for determining boiler operation oxygen content and an automatic control system. The method comprises the steps that the CO concentration and NOx concentration of smoke gas in a denitration inlet at a preset operating point are obtained; the NOx concentration curve rate produced when the CO concentration in the smoke gas in the denitration inlet is smaller than a preset value is determined; according to the operation oxygen content value corresponding to the minimum value of the curve rate, the boiler operation oxygen content is determined. The optimal operation oxygen content of a low-NOx combustion boiler can be rapidly determined through the NOx concentration curve rate produced when the CO concentration in the smoke gas in the denitration inlet is smaller than the preset value, the operation oxygen content of the boiler is automatically controlled, high-efficiency combustion is ensured, and meanwhile the low-level hearth outlet NOx concentration can be kept.

Description

technical field [0001] The invention relates to a method, a device and an automatic control system for determining the oxygen amount in boiler operation, and belongs to the technical field of oxygen amount control in boiler operation. Background technique [0002] In the prior art, in order to reduce NO x emission concentration, pulverized coal boilers usually use low NO x combustion technology. Compared with traditional pulverized coal combustion technology, low NO x Combustion technology has the advantages of low investment and operating costs, mature technology, and obvious emission reduction effects. combine figure 1 shown, existing low NO x Combustion technology mainly constructs a reduction zone between the main combustion zone and the burnout zone through the separated burn-off air, and uses the reducing gas produced by the under-oxygen combustion in the main combustion zone to reduce the small amount of NO generated by combustion in the main combustion zone x ,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23N3/00
CPCF23N3/00
Inventor 李金晶付俊杰张清峰赵振宁焦开明赵计平韩志成李乐义
Owner NORTH CHINA ELECTRICAL POWER RES INST
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