CN210171198U - Flue gas wet denitration system based on physical adsorption pre-oxidation - Google Patents

Flue gas wet denitration system based on physical adsorption pre-oxidation Download PDF

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Publication number
CN210171198U
CN210171198U CN201920922626.6U CN201920922626U CN210171198U CN 210171198 U CN210171198 U CN 210171198U CN 201920922626 U CN201920922626 U CN 201920922626U CN 210171198 U CN210171198 U CN 210171198U
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flue gas
communicated
tower
oxidation
outlet
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Shiqing Wang
汪世清
Dongfang Guo
郭东方
Hongwei Niu
牛红伟
Jinyi Wang
王金意
Shiwang Gao
郜时旺
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Huaneng Clean Energy Research Institute
China Huaneng Group Co Ltd
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Huaneng Clean Energy Research Institute
China Huaneng Group Co Ltd
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Abstract

The utility model discloses a flue gas wet process deNOx systems based on leading oxidation of physical adsorption, the entry of economizer is linked together with the high temperature flue gas pipeline of boiler, the export of economizer is linked together with the flue gas side entry of air preheater, the flue gas side export of air preheater is linked together with the entry of dust remover, the export of dust remover is linked together with the entry of draught fan, the export of draught fan is linked together with the flue gas entry of desulfurizing tower, the exhanst gas outlet of desulfurizing tower is linked together with the flue gas side entry of low temperature dehumidifier, the flue gas side export of low temperature dehumidifier is linked together with vapour and liquid separator's entry, vapour and liquid separator's gas outlet is linked together with the entry of adsorption oxidation tower, the export of adsorption oxidation tower is linked together with the flue gas entry of denitrating tower, wet process denitration of flue gas can be realized to this system, and the life of active carbon and molecular.

Description

Flue gas wet denitration system based on physical adsorption pre-oxidation
Technical Field
The utility model belongs to the technical field of the flue gas pollutant desorption, a flue gas wet process denitration system based on leading oxidation of physical adsorption is related to.
Background
The flue gas generated by coal burning contains a large amount of nitrogen oxides NOx, which is one of the main causes of air pollution. At present, NOx in flue gas is mainly removed by an SCR selective catalytic reduction method, wherein NOx is added into NH of flue gas under the action of a catalyst3Reduction to harmless N2And then removed. Although the SCR denitration technology is well developed, there still exist many problems. For example, the catalyst has high activity only in a specific temperature interval, and when the operation load of a power plant is adjusted, the change of the flue gas temperature can seriously affect the SCR denitration efficiency. In addition, SCR denitration has secondary pollution problems such as ammonia escape, catalyst solid waste and the like, and the denitration catalyst is also fast aged and lost, so that the operation cost is high. In addition to SCR selective reduction, there are wet denitration techniques, but these techniques require the oxidation of insoluble NO gas in NOx to soluble NO2Acid gases are then removed by absorption with a basic liquid. Common pre-oxidation methods include an ozone method, a hydrogen peroxide method, a catalyst oxidation method, a low-temperature plasma oxidation method, and the like. Ozone method and hydrogen peroxide methodThe strong oxidant is required to be consumed additionally, the operation cost is high, and secondary pollution emission is easily caused; the catalyst oxidation method requires a noble metal catalyst which is practical and expensive, and is difficult to be applied industrially; the low temperature plasma oxidation process is also more power consuming and results in higher operating costs.
In addition to the above method, researchers have found that NO in flue gas can be directly oxidized into NO by oxygen under the enrichment effect of physical adsorbents such as activated carbon or molecular sieve2. The adsorption capacity of adsorbents such as activated carbon, molecular sieve and the like to NO is reduced along with the rise of the temperature of the flue gas, and the adsorption capacity of NO is basically lost at the temperature of more than 100 ℃. In addition, a large amount of SO is present in the flue gas2And H2And O, the activated carbon and the molecular sieve adsorbent lose the activity quickly, namely the service life of the activated carbon and the molecular sieve adsorbent is short. Therefore, the physical adsorption method of pre-oxidation of NO followed by wet removal has not been industrially applied.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a flue gas wet process denitration system based on leading oxidation of physical adsorption, this system can realize the wet process denitration of flue gas, and the life of active carbon and molecular sieve adsorbent is longer.
In order to achieve the purpose, the flue gas wet denitration system based on physical adsorption pre-oxidation comprises an economizer, an air preheater, a dust remover, a draught fan, a desulfurization tower, a low-temperature dehumidifier, a gas-liquid separator, an adsorption oxidation tower and a denitration tower;
the inlet of the economizer is communicated with a high-temperature flue gas pipeline of a boiler, the outlet of the economizer is communicated with the flue gas side inlet of an air preheater, the flue gas side outlet of the air preheater is communicated with the inlet of a dust remover, the outlet of the dust remover is communicated with the inlet of an induced draft fan, the outlet of the induced draft fan is communicated with the flue gas inlet of a desulfurizing tower, the flue gas outlet of the desulfurizing tower is communicated with the flue gas side inlet of a low-temperature dehumidifier, the flue gas side outlet of the low-temperature dehumidifier is communicated with the inlet of a gas-liquid separator, the gas outlet of the gas-liquid separator is communicated with the inlet of an adsorption oxidation tower, and the outlet of the adsorption oxidation tower is.
And a clean flue gas outlet of the denitration tower is communicated with a power plant flue gas discharging system.
The gypsum slurry outlet at the bottom of the desulfurization tower is communicated with a gypsum preparation system.
The water outlet at the bottom of the gas-liquid separator is communicated with a power plant process water system.
The nitrate/nitrite solution outlet at the bottom of the denitration tower is communicated with the concentration and crystallization system.
The low-temperature side of the low-temperature dehumidifier is communicated with the water chiller.
The utility model discloses following beneficial effect has:
flue gas wet process deNOx systems based on leading oxidation of physical adsorption when concrete operation, before flue gas denitration, carry out desulfurization and dehydration treatment to the flue gas through desulfurizing tower and low temperature dehumidifier, avoid sulfur dioxide and the influence of moisture to physical adsorbent adsorption capacity that exists in a large number in the flue gas, in addition, cool down the flue gas to below the room temperature earlier through desulfurization and low temperature dehumidification link, the adsorption capacity of physical adsorbent to NO has been improved greatly, the life of extension active carbon and molecular sieve adsorbent, thereby NO's oxidation with higher speed, realize NO to NO2The conversion of (2) and then the absorption and desorption of the alkaline solution are carried out, and meanwhile, an SCR denitration device is avoided, so that the denitration operation cost is reduced.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Wherein, 1 is an economizer, 2 is an air preheater, 3 is a dust remover, 4 is a draught fan, 5 is a desulfurizing tower, 6 is a low-temperature dehumidifier, 7 is a water chiller, 8 is a gas-liquid separator, 9 is an adsorption oxidation tower, and 10 is a denitration tower.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the flue gas wet denitration system based on physical adsorption pre-oxidation of the present invention includes an economizer 1, an air preheater 2, a dust remover 3, an induced draft fan 4, a desulfurizing tower 5, a low temperature dehumidifier 6, a gas-liquid separator 8, an adsorption oxidation tower 9 and a denitration tower 10; the inlet of the economizer 1 is communicated with a high-temperature flue gas pipeline of a boiler, the outlet of the economizer 1 is communicated with the flue gas side inlet of the air preheater 2, the flue gas side outlet of the air preheater 2 is communicated with the inlet of the dust remover 3, the outlet of the dust remover 3 is communicated with the inlet of the induced draft fan 4, the outlet of the induced draft fan 4 is communicated with the flue gas inlet of the desulfurizing tower 5, the flue gas outlet of the desulfurizing tower 5 is communicated with the flue gas side inlet of the low-temperature dehumidifier 6, the flue gas side outlet of the low-temperature dehumidifier 6 is communicated with the inlet of the gas-liquid separator 8, the gas outlet of the gas-liquid separator 8 is communicated with the inlet of the adsorption oxidation tower 9, and the outlet of the adsorption oxidation tower 9 is communicated.
A clean flue gas outlet of the denitration tower 10 is communicated with a power plant flue gas discharging system; a gypsum slurry outlet at the bottom of the desulfurizing tower 5 is communicated with a gypsum preparation system; a water outlet at the bottom of the gas-liquid separator 8 is communicated with a power plant process water system; a nitrate/nitrite solution outlet at the bottom of the denitration tower 10 is communicated with a concentrated crystallization system; the low-temperature side of the low-temperature dehumidifier 6 is communicated with a water chiller 7.
The utility model discloses a concrete working process does:
the boiler flue gas passes through the economizer 1, the air preheater 2 and the dust remover 3 and then is introduced into the desulfurizing tower 5 by the induced draft fan 4, and SO in the flue gas2Absorbing and removing the waste gas in a desulfurizing tower 5 by limestone slurry, discharging gypsum generated in the desulfurizing tower 5 through the bottom of the desulfurizing tower 5, reducing the temperature of the flue gas to 50 ℃ after wet desulfurization, and discharging SO2The concentration is reduced to 35mg/Nm3The dust concentration was reduced to 5mg/Nm3The saturated wet flue gas discharged from the desulfurizing tower 5 is cooled to a temperature close to the freezing point (2 ℃) by a low-temperature dehumidifier 6 to condense and remove moisture in the flue gas, and then the saturated wet flue gas is subjected to gas-liquid separation by a gas-liquid separator 8, wherein the separated liquid is pumped into a power plant process water system, the separated flue gas enters an adsorption oxidation tower 9, and NO in the flue gas is oxidized into NO by excessive 6% of oxygen in the flue gas after being enriched on the surface of active carbon or a molecular sieve adsorbent in the adsorption oxidation tower 92Wherein, the space velocity is 1500h-1Under the condition of (3), the oxidation rate can reach more than 90 percent, and the gas is discharged from the adsorption oxidation tower 9The flue gas enters a denitration tower 10, and NO in the flue gas enters the denitration tower 102Absorbed by alkali liquor, the generated nitrate and nitrite solution is discharged from the bottom of the denitration tower 10, and then is subjected to a concentration crystallization process to obtain an ammonium salt nitrogen fertilizer product, and after the flue gas is subjected to denitration, the concentration of NOx is reduced to 50mg/Nm3And finally, the clean flue gas discharged from the top of the denitration tower 10 is discharged into the ambient atmosphere through a power plant smoke discharge system.

Claims (6)

1. A flue gas wet denitration system based on physical adsorption pre-oxidation is characterized by comprising an economizer (1), an air preheater (2), a dust remover (3), an induced draft fan (4), a desulfurizing tower (5), a low-temperature dehumidifier (6), a gas-liquid separator (8), an adsorption oxidation tower (9) and a denitration tower (10);
the inlet of an economizer (1) is communicated with a high-temperature flue gas pipeline of a boiler, the outlet of the economizer (1) is communicated with the flue gas side inlet of an air preheater (2), the flue gas side outlet of the air preheater (2) is communicated with the inlet of a dust remover (3), the outlet of the dust remover (3) is communicated with the inlet of an induced draft fan (4), the outlet of the induced draft fan (4) is communicated with the flue gas inlet of a desulfurizing tower (5), the flue gas outlet of the desulfurizing tower (5) is communicated with the flue gas side inlet of a low-temperature dehumidifier (6), the flue gas side outlet of the low-temperature dehumidifier (6) is communicated with the inlet of a gas-liquid separator (8), the gas outlet of the gas-liquid separator (8) is communicated with the inlet of an adsorption oxidation tower (9), and the outlet of the adsorption oxidation tower (9) is communicated with the flue gas inlet of a denitration tower.
2. The wet flue gas denitration system based on physical adsorption pre-oxidation as claimed in claim 1, characterized in that the clean flue gas outlet of the denitration tower (10) is communicated with the power plant flue gas system.
3. The wet flue gas denitration system based on physical adsorption pre-oxidation as claimed in claim 1, wherein the gypsum slurry outlet at the bottom of the desulfurization tower (5) is communicated with a gypsum preparation system.
4. The wet flue gas denitration system based on physical adsorption pre-oxidation as claimed in claim 1, wherein the water outlet at the bottom of the gas-liquid separator (8) is communicated with a power plant process water system.
5. The wet flue gas denitration system based on physical adsorption pre-oxidation as claimed in claim 1, wherein the nitrate/nitrite solution outlet at the bottom of the denitration tower (10) is communicated with the concentration and crystallization system.
6. The wet flue gas denitration system based on physical adsorption pre-oxidation as claimed in claim 1, wherein the low temperature side of the low temperature dehumidifier (6) is communicated with the water chiller (7).
CN201920922626.6U 2019-06-18 2019-06-18 Flue gas wet denitration system based on physical adsorption pre-oxidation Active CN210171198U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110152478A (en) * 2019-06-18 2019-08-23 中国华能集团有限公司 A kind of flue gas wet denitration system and method based on the preposition oxidation of physical absorption
WO2021232693A1 (en) * 2020-05-18 2021-11-25 中国华能集团有限公司 Flue gas integrated desulfurization and denitration method based on low-temperature adsorption principle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110152478A (en) * 2019-06-18 2019-08-23 中国华能集团有限公司 A kind of flue gas wet denitration system and method based on the preposition oxidation of physical absorption
WO2021232693A1 (en) * 2020-05-18 2021-11-25 中国华能集团有限公司 Flue gas integrated desulfurization and denitration method based on low-temperature adsorption principle

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