Coal-fired boiler SCR denitration process and ammonia/air mixer thereof

A technology for coal-fired boilers and mixers, applied in fluid mixers, mixers, gas treatment, etc., can solve problems such as ammonia/air mixer clogging, and achieve the effects of solving clogging, low manufacturing cost, and simple structure

Inactive Publication Date: 2019-04-23
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the object of the present invention is to provide a coal-fired boiler SCR denitrification process and its ammonia / air mixer, the NO in the flue gas X The removal effect is high, the structure of the ammonia / air mixer is simple, the manufacturing cost is low, and it can realize the uninterrupted denitrification of flue gas. It does not affect the normal operation of the ammonia / air mixer, and can solve the problem of blockage of the ammonia / air mixer, so that the internal flow equalizing corrugated plate can be cleaned in real time, and the continuous normal operation of the boiler device and denitrification device can be maintained, so as to realize the environmental protection of boiler flue gas Discharge

Method used

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  • Coal-fired boiler SCR denitration process and ammonia/air mixer thereof
  • Coal-fired boiler SCR denitration process and ammonia/air mixer thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A coal-fired boiler SCR denitrification process described in this embodiment, the flue gas generated by the boiler is discharged through the denitrification device after spraying ammonia, so as to realize the SCR denitrification of the boiler;

[0033] Among them, the flow of ammonia gas entering the ammonia injection grid is controlled, and the diluted ammonia gas is evenly distributed in the flue and the NO in the flue gas X Fully mixed, when the mixed flue gas reaches the catalyst area of ​​the denitrification device, a chemical reaction occurs to remove the NO in the flue gas X Decomposed into water and nitrogen.

[0034] A catalyst layer and a catalyst reserve layer are arranged in the denitration reactor.

[0035] The ammonia gas for ammonia injection is ammonia gas diluted with air, and the volume ratio of ammonia gas is ≤5%.

[0036] The ammonia / air mixer for the SCR denitrification process of the coal-fired boiler comprises an ammonia / air mixer main body 9, t...

Embodiment 2

[0053] The denitrification process and device of the present invention are the same as in Example 1, except that the ammonia source of the ammonia / air mixer: the ammonia gas entering the ammonia / air mixer enters through the denitrification ammonia gas pipe, and the inlet pressure is 0.6MPa.

Embodiment 3

[0055] The denitrification process and device of the present invention are the same as those in Example 1, the difference being that the ammonia gas source of the ammonia / air mixer: the ammonia gas entering the ammonia / air mixer enters through the denitrification ammonia gas pipe, and the inlet pressure is 0.3 MPa.

[0056] After 4,000 hours of normal operation of a certain coal-fired boiler, it was found that the dilution air volume of the SCR flue gas denitrification device decreased from 3,500Nm3 / h to 2,600Nm 3 / h, at this time, it is judged that the ammonia / air mixer is blocked by ammonium salt crystallization, dust, water vapor impurities and other mixtures on the surface of the equalizing corrugated plate after long-term use, which reduces the dilution air volume. The dilution air volume is close to the limit alarm value, which will cause the denitrification device to shut down.

[0057] At this point the ammonia / air mixer is steam purged. After arriving at the site, af...

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Abstract

The invention relates to a coal-fired boiler SCR denitration process and an ammonia/air mixer thereof. According to the coal-fired boiler SCR denitration process, flue gas generated by a boiler is subjected to ammonia spraying, and then is discharged by a denitration device so as to achieve the boiler SCR denitration, wherein the flow rate of the ammonia gas entering an ammonia spraying grid is controlled, the diluted ammonia gas is uniformly dispersed in a flue channel, and is completely mixed with the NOX in the flue gas in the flue channel, and the mixed flue gas is subjected to a chemicalreaction to decompose the NOX in the flue gas into water and nitrogen when the mixed flue gas reaches the catalyst region of the denitration device. According to the present invention, the effect of the removal of NOX in the flue gas is high; the ammonia/air mixer has characteristics of simple structure and low manufacturing cost, and can achieve the uninterrupted denitration work of flue gas; theblockage problem of the ammonia/air mixer can be solved while the normal operation of the ammonia/air mixer cannot be affected; and the internal flow equalization corrugated plate can achieve real-time cleaning, the continuous normal operation of the boiler device and the denitration device can be maintained, and the boiler flue gas can achieve the environmentally-friendly and standard discharge.

Description

technical field [0001] The invention relates to an SCR denitration process for a coal-fired boiler and an ammonia / air mixer thereof. Background technique [0002] At present, domestic large-scale thermal power plants generally adopt selective catalytic reduction (SCR) flue gas denitrification technology in order to achieve environmental protection emission indicators of flue gas, which can not only meet environmental protection requirements, but also save the amount of reducing agent and achieve lower production and operation costs. Since the explosion limit of ammonia is 15% to 28%, the flow rate of the dilution fan is generally designed according to the volume ratio of ammonia supply to air mixing at 100% boiler load. Therefore, the SCR denitrification device supporting a boiler in a power plant is designed for ammonia dilution air volume. 3800Nm 3 / h, air is fed into the ammonia / air mixer by the dilution fan. [0003] At present, the ammonia-air mixer of the SCR flue ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56B01F5/06
CPCB01D53/8631B01D2258/0283B01D2251/2062B01F25/421
Inventor 王军明齐国杰
Owner CHINA PETROLEUM & CHEM CORP
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