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Coal burning boiler polymer dry-process denitrifying agent, preparation method thereof and denitrifying process

A coal-fired boiler and denitrification agent technology, which is applied in the field of boiler flue gas denitrification, can solve the problems of limited denitrification efficiency, high investment cost, and low denitrification efficiency, and achieve complete denitrification, high denitrification efficiency, and low ammonia escape rate.

Inactive Publication Date: 2016-07-20
CHANGYI DAWEI ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the efficiency of the SCR denitrification process is high, the investment cost is very expensive and the operating cost is also very high; although the investment cost and operating cost of the SNCR denitrification process are relatively low, the denitrification efficiency is limited, and it can only be used in the fluidization of high temperature cyclone separation. Only 60% of the denitrification effect can be achieved on bed boilers. If it is used on pulverized coal boilers, low-temperature cyclone separation fluidized bed boilers and chain boilers, the denitrification efficiency is less than 40% because there is no suitable temperature condition for denitrification; at the same time, these denitrification methods It is easy to cause secondary pollution and safety problems, high cost, low denitrification efficiency, etc.

Method used

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  • Coal burning boiler polymer dry-process denitrifying agent, preparation method thereof and denitrifying process
  • Coal burning boiler polymer dry-process denitrifying agent, preparation method thereof and denitrifying process

Examples

Experimental program
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Effect test

Embodiment 1

[0026] 1. Denitration agent and its preparation method:

[0027] The polymer dry denitrification agent for coal-fired boilers consists of the following raw materials in parts by weight:

[0028] 30 parts of urea; 20 parts of silica powder; 30 parts of sodium carbonate; 20 parts of bentonite; 10 parts of sodium sulfate; 30 parts of shale powder.

[0029] refer to figure 1 , the preparation method is as follows: Weigh the full amount of raw materials (A, B...F) according to the ratio of raw materials, crush and grind each raw material to 50-60 meshes, and then enter the mixer to fully stir and mix until the materials are uniform , and then to the specified time, and then packaging inventory Serve as the final product.

[0030] In order to improve the uniformity and consistency of the material, the mixed material can go through multiple grinding, mixing and grinding processes.

[0031] 2. Denitrification system and denitrification process

[0032] refer to figure 2 , the de...

Embodiment 2

[0042] The polymer dry denitrification agent for coal-fired boilers consists of the following raw materials in parts by weight:

[0043] 35 parts of urea; 25 parts of silicon dioxide powder; 20 parts of sodium carbonate; 25 parts of bentonite; 12 parts of sodium sulfate; 25 parts of shale powder.

[0044] The denitrification system and denitrification process are the same as in Example 1, and will not be described in detail.

Embodiment 3

[0046] The polymer dry denitrification agent for coal-fired boilers consists of the following raw materials in parts by weight:

[0047] 40 parts of urea; 30 parts of silica powder; 20 parts of sodium carbonate; 30 parts of bentonite; 15 parts of sodium sulfate; 30 parts of shale powder.

[0048] The denitrification system and denitrification process are the same as in Example 1, and will not be described in detail.

[0049] When adopting the denitrification agent prepared in embodiment 1, embodiment 2, embodiment 3 to operate in conjunction with the denitrification system, with other denitrification energy-saving technologies and products [such as selective non-catalytic reduction (SNCR), selective catalytic reduction (SCR), Electron beam combined desulfurization and denitration method, activated carbon combined desulfurization and denitrification method, ozone oxidation absorption method, etc.] have the following advantages: 1. High denitrification efficiency, up to 95%; 2. ...

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Abstract

The invention discloses a coal burning boiler polymer dry-process denitrifying agent, a preparation method thereof and a denitrifying process. The coal burning boiler polymer dry-process denitrifying agent comprises, by weight, 30-40 parts of urea, 20-30 parts of silicon dioxide powder, 20-30 parts of sodium carbonate, 20-30 parts of bentonite, 10-15 parts of anhydrous sodium sulphate and 20-30 parts of shale powder. The denitrifying agent can effectively lower activation energy of oxidation reaction of bunker coal, oxynitride in smoke during the burning process is eliminated, emitted hazardous substances such as oxynitride is turned into harmless ash and nitrogen through chemical reaction, and the smoke is enabled to meet the emission standard.

Description

technical field [0001] The invention relates to the technical field of boiler flue gas denitrification, in particular to a polymer dry denitrification agent for coal-fired boilers and a preparation method thereof, and a denitrification process for treating coal-fired boiler flue gas by using the above-mentioned denitrification agent. Background technique [0002] Air pollution is serious in our country. According to data estimates, the main air pollutants emitted by coal combustion, such as soot, sulfur oxides, nitrogen oxides, etc., account for about 96% of the total fuel combustion emissions. In today's very severe smog and air pollution environment, in order to meet the increasingly stringent environmental protection requirements, implement and adapt to the State Council's "Action Plan for Air Pollution Prevention and Control", "Emission Standards of Air Pollutants for Thermal Power Plants", "Emission Standards for Boiler Air Pollutants" ", "Emission Standards of Air Poll...

Claims

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Application Information

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IPC IPC(8): B01D53/90B01D53/83B01D53/56C10L9/10
CPCB01D53/83B01D53/8628B01D53/90B01D2251/2067B01D2251/304B01D2255/30B01D2255/40B01D2258/0283C10L9/10C10L2230/04C10L2230/22
Inventor 郭伟强
Owner CHANGYI DAWEI ENVIRONMENTAL PROTECTION TECH CO LTD
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