CN216537812U - Low-temperature desulfurization and denitrification system for flue gas of biomass power plant - Google Patents

Low-temperature desulfurization and denitrification system for flue gas of biomass power plant Download PDF

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Publication number
CN216537812U
CN216537812U CN202122371170.9U CN202122371170U CN216537812U CN 216537812 U CN216537812 U CN 216537812U CN 202122371170 U CN202122371170 U CN 202122371170U CN 216537812 U CN216537812 U CN 216537812U
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flue gas
temperature
low
inlet
communicated
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CN202122371170.9U
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刘练波
肖平
许世森
李卫东
郜时旺
牛红伟
汪世清
彭虎
徐丹
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Huaneng Clean Energy Research Institute
Huaneng Hunan Yueyang Power Generation Co Ltd
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Huaneng Clean Energy Research Institute
Huaneng Hunan Yueyang Power Generation Co Ltd
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Priority to PCT/CN2022/099161 priority patent/WO2023050896A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The utility model discloses a low-temperature desulfurization and denitrification system for flue gas of a biomass power plant, which comprises the following components: the system comprises a biomass boiler, a refrigeration system, a first low-temperature adsorption tower, a cryogenic system and a second low-temperature adsorption tower; the refrigerating system comprises a first smoke inlet and a first smoke outlet, and the smoke discharge port is communicated with the first smoke inlet; the first low-temperature adsorption tower comprises a second flue gas inlet and a second flue gas outlet, and the first flue gas outlet is communicated with the second flue gas inlet; the deep cooling system comprises a third flue gas inlet and a third flue gas outlet, and the second flue gas outlet is communicated with the third flue gas inlet; the second low-temperature adsorption tower comprises a fourth flue gas inlet and a fourth flue gas outlet, and the third flue gas outlet is communicated with the fourth flue gas inlet. The low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant has the advantages of high denitrification rate and high desulfurization rate.

Description

Low-temperature desulfurization and denitrification system for flue gas of biomass power plant
Technical Field
The utility model relates to the technical field of gas purification, in particular to a low-temperature desulfurization and denitrification system for flue gas of a biomass power plant.
Background
The biomass power plant is a boiler using biomass energy as fuel, wherein wastes in the agricultural production process, such as crop straws, wastes of agricultural processing industry and the like can be used as the fuel of the biomass power plant, so compared with a coal-fired power plant, the biomass energy has the advantages of renewability, low pollution, abundant raw material sources and the like. The flue gas generated by the biomass boiler contains pollutants such as sulfur dioxide and nitrogen oxide. In the related art, flue gas generated from a biomass power plant is subjected to desulfurization and denitration treatment under high temperature conditions, but the desulfurization and denitration efficiency is low.
SUMMERY OF THE UTILITY MODEL
The present invention is based on the discovery and recognition by the inventors of the following facts and problems:
the desulfurization efficiency of the related technology is generally up to 70%, the desulfurizing agent is limestone, the limestone is decomposed into calcium oxide and carbon dioxide at high temperature, and SO2 in the flue gas is removed by chemical reaction. The efficiency of the related technology adopting the method to carry out the in-furnace calcium spraying desulfurization is about 60 to 65 percent, so the desulfurization efficiency is low.
In the related technology, reducing agents such as NH3 and urea are sprayed into a boiler to selectively react with NOx, a catalyst is not needed, the reducing agents are added under the high-temperature condition, the reducing agents are thermally decomposed into NH3 and react with the NOx in the flue gas to generate N2 and water, and then the flue gas is subjected to denitration treatment. The denitration efficiency of the related technology is generally 30-80%, and is greatly influenced by the temperature of a boiler hearth. The denitration efficiency of the related technology can reach 60% above 850 ℃, and reaches the maximum value at 900 ℃, so that the denitration efficiency is low.
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the embodiment of the utility model provides a low-temperature desulfurization and denitrification system for flue gas of a biomass power plant, which has the advantages of high denitrification rate and high desulfurization rate.
The low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant comprises the following components: a biomass boiler including a flue gas discharge port; the refrigerating system comprises a first flue gas inlet and a first flue gas outlet, and the flue gas discharge port is communicated with the first flue gas inlet so as to introduce the flue gas into the refrigerating system and reduce the temperature of the flue gas to 5-15 ℃; the first low-temperature adsorption tower comprises a second flue gas inlet and a second flue gas outlet, and the first flue gas outlet is communicated with the second flue gas inlet so as to introduce the flue gas into the first low-temperature adsorption tower, so that the flue gas is desulfurized; the cryogenic system comprises a third flue gas inlet and a third flue gas outlet, and the second flue gas outlet is communicated with the third flue gas inlet so as to introduce the flue gas into the cryogenic system, so that the temperature of the flue gas is reduced to below-10 ℃; and the second low-temperature adsorption tower comprises a fourth flue gas inlet and a fourth flue gas outlet, and the third flue gas outlet is communicated with the fourth flue gas inlet so as to introduce the flue gas into the second low-temperature adsorption tower, thereby denitrating the flue gas.
The low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant, provided by the embodiment of the utility model, is used for cooling the flue gas through the refrigerating system, reducing the temperature of the flue gas to 5-15 ℃, and performing desulfurization treatment on the low-temperature (5-15 ℃) flue gas in the first low-temperature adsorption tower, wherein the desulfurization efficiency of the flue gas is high under the low-temperature condition of 5-15 ℃, so that the desulfurization rate of the low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant is increased. The flue gas desulfurized by the first low-temperature adsorption tower is cooled again by the cryogenic system, the temperature of the flue gas is reduced to be below-10 ℃, the cooled low-temperature flue gas (the temperature is below-10 ℃) is denitrated in the second low-temperature adsorption tower, and the desulfurization efficiency of the flue gas is high under the low-temperature condition of below-10 ℃, so that the denitration rate of the low-temperature desulfurization and denitration system for the flue gas of the biomass power plant in the embodiment of the utility model is increased.
Therefore, the low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant has the advantages of high denitrification rate and high desulfurization rate.
In some embodiments, the low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant of the embodiment of the utility model further comprises an economizer, wherein the economizer comprises a fifth flue gas inlet and a fifth flue gas outlet, the flue gas discharge port is communicated with the fifth flue gas inlet so as to introduce the flue gas into the economizer, so that the temperature of the flue gas is reduced to 120-150 ℃, and the fifth flue gas outlet is communicated with the first flue gas inlet so as to communicate the flue gas discharge port with the first flue gas inlet.
In some embodiments, the low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant of the embodiment of the utility model further comprises a water cooler, wherein the water cooler comprises a sixth flue gas inlet and a sixth flue gas outlet, the fifth flue gas outlet is communicated with the sixth flue gas inlet so as to introduce the flue gas into the water cooler, thereby reducing the temperature of the flue gas to 60-90 ℃, and the sixth flue gas outlet is communicated with the first flue gas inlet so as to communicate the fifth flue gas outlet with the first flue gas inlet.
In some embodiments, the water cooler further comprises a cooling water pipeline, and the cooling water pipeline is used for introducing cooling water so as to exchange heat with the flue gas, so that the temperature of the flue gas is reduced to 60-90 ℃.
In some embodiments, the low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant of the embodiment of the utility model further comprises a recooler, wherein the recooler comprises a seventh flue gas inlet and a seventh flue gas outlet, the sixth flue gas outlet is communicated with the seventh flue gas inlet so as to introduce the flue gas into the recooler, thereby reducing the temperature of the flue gas to 30-60 ℃, and the seventh flue gas outlet is communicated with the first flue gas inlet so as to communicate the sixth flue gas outlet with the first flue gas inlet.
In some embodiments, the recooler comprises a low temperature flue gas duct including an eighth flue gas inlet and an eighth flue gas outlet, the fourth flue gas outlet communicating with the eighth flue gas inlet to pass the flue gas into the low temperature flue gas duct to cool the recooler, the eighth flue gas outlet communicating with the inlet of the chimney to communicate the inlet of the chimney with the fourth flue gas outlet to discharge the flue gas.
In some embodiments, the low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant in the embodiments of the utility model further includes a dust remover, where the dust remover includes a gas inlet and a gas outlet, the gas inlet is communicated with the fifth flue gas outlet so as to introduce the flue gas into the dust remover, and the gas outlet is communicated with the sixth flue gas inlet so as to communicate the fifth flue gas outlet with the sixth flue gas inlet.
In some embodiments, the low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant in the embodiments of the utility model further comprises an induced draft fan, the induced draft fan is arranged between the water cooler and the dust remover, an air inlet of the induced draft fan is communicated with the air outlet, and an air outlet of the induced draft fan is communicated with the sixth flue gas inlet, so that the sixth flue gas inlet is communicated with the air outlet.
In some embodiments, the low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant of any of the above embodiments further comprises a chimney, and an inlet of the chimney is communicated with the fourth flue gas outlet so as to discharge the flue gas.
Drawings
FIG. 1 is a schematic structural diagram of a low-temperature desulfurization and denitrification system for flue gas of a biomass power plant according to an embodiment of the utility model.
FIG. 2 is a schematic structural diagram of a low-temperature desulfurization and denitrification system for flue gas of a biomass power plant according to an embodiment of the utility model.
Reference numerals:
a biomass boiler 1; a flue gas discharge port 11;
a refrigeration system 2; a first flue gas inlet 21; a first flue gas outlet 22;
a first low-temperature adsorption column 3; a second flue gas inlet 31; a second flue gas outlet 32;
a cryogenic system 4; a third flue gas inlet 41; a third flue gas outlet 42;
a second low-temperature adsorption tower 5; a fourth flue gas inlet 51; a fourth flue gas outlet 52;
a chimney 6; an inlet 61; an outlet 62;
an economizer 7; a fifth flue gas inlet 71; a fifth flue gas outlet 72;
a water cooler 8; a sixth flue gas inlet 81; a sixth flue gas outlet 82;
a recooler 9; a seventh flue gas inlet 91; a seventh flue gas outlet 92; a low temperature flue gas duct 93; an eighth flue gas inlet 931; an eighth flue gas outlet 932;
a dust remover 10; an air inlet 101; an air outlet 102; a dust outlet 103;
an induced draft fan 20; an air inlet 201; and an air outlet 202.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.
The low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant according to the embodiment of the utility model is described below with reference to the accompanying drawings.
As shown in fig. 1-2, the low-temperature desulfurization and denitrification system for flue gas of a biomass power plant according to the embodiment of the utility model comprises a biomass boiler 1, a refrigeration system 2, a first low-temperature adsorption tower 3, a cryogenic system 4 and a second low-temperature adsorption tower 5.
The biomass boiler 1 comprises a smoke discharge port 11, specifically, biomass fuel is sent to the biomass boiler 1 to be incinerated, and smoke generated by incineration is discharged from the smoke discharge port 11.
The refrigerating system 2 comprises a first flue gas inlet 21 and a first flue gas outlet 22, and the flue gas discharge port 11 is communicated with the first flue gas inlet 21 so as to introduce the flue gas into the refrigerating system 2, thereby reducing the temperature of the flue gas to 5-15 ℃.
Specifically, as shown in fig. 1, flue gas incinerated by the biomass boiler 1 is discharged from the flue gas discharge port 11, and enters the refrigeration system 2 through the first flue gas inlet 21, and the refrigeration system 2 cools the flue gas, wherein the temperature of the flue gas after cooling is 5 ℃ to 15 ℃. The cooled flue gas exits the refrigeration system 2 through the first flue gas outlet 22.
The first low-temperature adsorption tower 3 comprises a second flue gas inlet 31 and a second flue gas outlet 32, and the first flue gas outlet 22 is communicated with the second flue gas inlet 31 so as to introduce the flue gas into the first low-temperature adsorption tower 3, thereby desulfurizing the flue gas.
Specifically, as shown in fig. 1, the flue gas subjected to temperature reduction treatment enters the first low-temperature adsorption tower 3 from the second flue gas inlet 31, the flue gas is subjected to desulfurization treatment in the first low-temperature adsorption tower 3, and the flue gas desulfurized by the first low-temperature adsorption tower 3 is discharged from the second flue gas outlet 32 out of the first low-temperature adsorption tower 3.
It can be understood that the height of the first cryoadsorption tower 3 is large, so that the flue gas in the first cryoadsorption tower 3 can fully react in the first cryoadsorption tower 3, and thus the desulfurization rate of the low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant is increased.
In addition, be equipped with the active carbon that is used for the desulfurization in the first cryoadsorption tower 3, the active carbon has catalytic action to the reaction of the sulphur compound that contains in the flue gas and oxygen to the active carbon has the micropore on the surface, can adsorb the product after the reaction of sulphur compound and oxygen, and then reaches the effect of desulfurization.
The cryogenic system 4 comprises a third flue gas inlet 41 and a third flue gas outlet 42, and the second flue gas outlet 32 is communicated with the third flue gas inlet 41 so as to introduce the flue gas into the cryogenic system 4, thereby reducing the temperature of the flue gas to below-10 ℃.
Specifically, as shown in fig. 1, the flue gas after desulfurization enters the cryogenic system 4 from the third flue gas inlet 41, the flue gas is cooled again in the cryogenic system 4, wherein the temperature of the flue gas after cooling is below-10 ℃, and the flue gas after cooling is discharged from the cryogenic system 4 from the third flue gas outlet 42.
The second low-temperature adsorption tower 5 comprises a fourth flue gas inlet 51 and a fourth flue gas outlet 52, and the third flue gas outlet 42 is communicated with the fourth flue gas inlet 51 so as to introduce the flue gas into the second low-temperature adsorption tower 5, thereby denitrating the flue gas.
Specifically, as shown in fig. 1, the flue gas cooled by the cryogenic system 4 enters the second cryogenic adsorption tower 5 from the fourth flue gas inlet 51, and the flue gas undergoes denitration treatment in the second cryogenic adsorption tower 5. The flue gas subjected to denitration treatment is discharged from the fourth flue gas outlet 52 out of the second low-temperature adsorption tower 5.
It can be understood that the second low-temperature adsorption tower 5 is internally provided with active coke, and the surface of the active coke is provided with micropores capable of adsorbing nitrogen oxides in the sulfur-containing flue gas. In addition, the active coke can generate catalytic reduction reaction on NO in the flue gas, and the NO is reduced into N2 under the action of a reducing agent NH3, so that the aims of denitration and deamination are fulfilled.
The low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant, provided by the embodiment of the utility model, is used for cooling the flue gas through the refrigerating system 2, reducing the temperature of the flue gas to 5-15 ℃, and performing desulfurization treatment on the low-temperature (5-15 ℃) flue gas in the first low-temperature adsorption tower 3, wherein the desulfurization efficiency of the flue gas is high under the low-temperature condition of 5-15 ℃, so that the desulfurization rate of the low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant is increased. The flue gas desulfurized by the first low-temperature adsorption tower 3 is cooled again by the cryogenic system 4, the temperature of the flue gas is reduced to be below-10 ℃, the cooled low-temperature flue gas (the temperature is below-10 ℃) is denitrated in the second low-temperature adsorption tower 5, and the desulfurization efficiency of the flue gas is high under the low-temperature condition of below-10 ℃, so that the denitration rate of the low-temperature desulfurization and denitration system for the flue gas of the biomass power plant in the embodiment of the utility model is increased.
Therefore, the low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant has the advantages of high denitrification rate and high desulfurization rate.
In some embodiments, the first low temperature adsorption tower 3 may be provided with slaked lime, and it is understood that the first low temperature adsorption tower 3 performs desulfurization treatment on the flue gas by reacting the slaked lime with the flue gas, so that the first low temperature adsorption tower 3 can remove sulfur compounds in the flue gas. Wherein, the first low-temperature adsorption tower 3 carries out desulfurization treatment on the flue gas, including dry desulfurization and semi-dry desulfurization.
Optionally, a dry desulfurization method is adopted to remove sulfur-containing compounds in the smoke, wherein the dry hydrated lime is used as an absorbent, and the smoke in the first low-temperature adsorption tower 3 reacts with the dry hydrated lime, so that the sulfur-containing compounds in the smoke are removed. Or removing sulfur-containing compounds in the smoke by adopting a semidry method for desulfurization. The slaked lime slurry is sprayed in the first low-temperature adsorption tower 3, so that the slaked lime slurry is uniformly distributed in the first low-temperature adsorption tower 3, the flue gas is reacted with the slaked lime in the first low-temperature adsorption tower 3, and then sulfur-containing compounds in the flue gas are removed.
In some embodiments, as shown in fig. 2, the low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant in the embodiment of the utility model further includes an economizer 7.
The economizer 7 comprises a fifth flue gas inlet 71 and a fifth flue gas outlet 72, the flue gas discharge port 11 is communicated with the fifth flue gas inlet 71 so as to introduce the flue gas into the economizer 7, thereby reducing the temperature of the flue gas to 120-150 ℃, and the fifth flue gas outlet 72 is communicated with the first flue gas inlet 21 so as to communicate the flue gas discharge port 11 with the first flue gas inlet 21.
Specifically, the flue gas discharged from the biomass boiler 1 is discharged through the flue gas discharge port 11, enters the economizer 7 through the fifth flue gas outlet 72, is subjected to temperature reduction treatment in the economizer 7 to reduce the temperature to 120-150 ℃, is discharged from the economizer 7 through the fifth flue gas outlet 72, and enters the refrigeration system 2 through the first flue gas inlet 21.
It can be understood that, the temperature reduction treatment of the flue gas in the economizer 7 is to exchange heat with the flue gas through the economizer 7, so that the economizer 7 absorbs a part of heat of the flue gas, and thus the temperature of the flue gas is reduced. And the economizer 7 absorbs the heat of the high-temperature flue gas, heats the refrigerant in the economizer 7, and the heat of the heated refrigerant can provide energy for other devices, so that the absorbed heat is recycled, and the utilization rate of the energy is improved.
In some embodiments, the low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant of the embodiments of the utility model further includes a water cooler 8.
The water cooler 8 comprises a sixth flue gas inlet 81 and a sixth flue gas outlet 82, the fifth flue gas outlet 72 is communicated with the sixth flue gas inlet 81 so as to introduce the flue gas into the water cooler 8, thereby reducing the temperature of the flue gas to 60 ℃ -90 ℃, and the sixth flue gas outlet 82 is communicated with the first flue gas inlet 21 so as to communicate the fifth flue gas outlet 72 with the first flue gas inlet 21, that is, the water cooler 8 is arranged between the economizer 7 and the refrigeration system 2.
Specifically, the flue gas cooled by the economizer 7 is discharged from the fifth flue gas outlet 72, and enters the water cooler 8 through the sixth flue gas inlet 81. The flue gas is cooled in a water cooler 8, wherein the temperature of the flue gas cooled by the water cooler 8 is 60-90 ℃. The flue gas cooled by the water cooler 8 is discharged from the sixth flue gas outlet 82 and enters the refrigeration system 2 through the first flue gas inlet 21, so that the fifth flue gas outlet 72 is communicated with the first flue gas inlet 21.
It can be understood that the flue gas cooled by the economizer 7 is introduced into the water cooler 8 for cooling again, so that the temperature of the flue gas is reduced to 60-90 ℃, and then the flue gas is introduced into the refrigerating system 2, thereby reducing the load of the refrigerating system 2 and prolonging the service life of the refrigerating system 2.
Further, the water cooler 8 also comprises a cooling water pipeline, and the cooling water pipeline is used for introducing cooling water so as to exchange heat with the flue gas, so that the temperature of the flue gas is reduced to 60-90 ℃.
In some embodiments, as shown in fig. 2, the low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant according to the embodiment of the utility model further includes a dust remover 10, the dust remover 10 includes a gas inlet 101 and a gas outlet 102, the gas inlet 101 is communicated with the fifth flue gas outlet 72 so as to introduce the flue gas into the dust remover 10, and the gas outlet 102 is communicated with the sixth flue gas inlet 81 so as to communicate the fifth flue gas outlet 72 with the sixth flue gas inlet 81.
Specifically, the flue gas treated by the economizer 7 is discharged from the fifth flue gas outlet 72, and enters the dust remover 10 through the gas inlet 101, and the dust remover 10 removes dust from the flue gas, wherein the dust remover 10 can remove smoke from the flue gas, and the flue gas after dust removal is discharged from the gas outlet 102 of the dust remover 10.
In addition, the dust remover 10 further comprises a dust outlet 103, and the smoke removed from the flue gas is discharged from the dust outlet 103 of the dust remover 10, so that secondary pollution of the residual smoke of the dust remover 10 to the flue gas is avoided.
In some embodiments, as shown in fig. 2, the low-temperature desulfurization and denitrification system for flue gas of a biomass power plant according to the embodiments of the present invention further includes an induced draft fan 20, the induced draft fan 20 is disposed between the water cooler 8 and the dust remover 10, an air inlet 201 of the induced draft fan is communicated with the air outlet 102, and an air outlet 202 of the induced draft fan is communicated with the sixth flue gas inlet 81, so that the sixth flue gas inlet 81 is communicated with the air outlet 202.
Specifically, the flue gas discharged from the dust collector 10 enters the induced draft fan 20 from the air inlet, and is discharged from the air outlet 202 of the induced draft fan 20. It can be understood that the induced draft fan 20 has rotatable fan blades, and the fan blades rotate to accelerate the flow velocity of the flue gas, so that the induced draft fan 20 can accelerate the circulation speed of the flue gas in the low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant according to the embodiment of the present invention.
In some embodiments, as shown in fig. 2, the low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant according to the embodiment of the utility model further includes a recooler 9.
The recooler 9 comprises a seventh flue gas inlet 91 and a seventh flue gas outlet 92, the sixth flue gas outlet 82 being in communication with the seventh flue gas inlet 91 for passing flue gas into the recooler 9 to lower the temperature of the flue gas to 30-60 ℃, the seventh flue gas outlet 92 being in communication with the first flue gas inlet 21 to place the sixth flue gas outlet 82 in communication with the first flue gas inlet 21.
Specifically, the flue gas cooled by the water cooler 8 enters the recooling device 9 from the seventh flue gas inlet 91, and the flue gas is cooled in the recooling device 9, wherein the recooling device 9 cools the flue gas to 30-60 ℃. The flue gas cooled by the recooling device 9 is discharged from the seventh flue gas outlet 92, and then enters the refrigerating system 2 through the first flue gas inlet 21.
It can be understood that the flue gas cooled by the water cooler 8 is introduced into the recooling device 9 to be cooled again, so that the temperature of the flue gas is reduced to 30-60 ℃, and then the flue gas is introduced into the refrigerating system 2, thereby reducing the load of the refrigerating system 2 and prolonging the service life of the refrigerating system 2.
Further, the recooler 9 comprises a low temperature flue gas duct 93, the low temperature flue gas duct 93 comprises an eighth flue gas inlet 931 and an eighth flue gas outlet 932, and the fourth flue gas outlet 52 is in communication with the eighth flue gas inlet 931 so as to pass the flue gas into the low temperature flue gas duct 93, thereby cooling the recooler 9.
Specifically, the flue gas subjected to denitration treatment in the second low-temperature adsorption tower 5 is discharged from the fourth flue gas outlet 52, and enters the recooling device 9 through the eighth flue gas inlet 931 of the low-temperature flue gas pipeline 93, and the low-temperature flue gas in the low-temperature flue gas pipeline 93 exchanges heat with the flue gas in the recooling device 9 (the flue gas is cooled by the water cooler 8, and the temperature of the flue gas is 60-90 ℃), so that the temperature of the flue gas in the recooling device 9 is reduced to 30-60 ℃. The temperature of the flue gas in the low-temperature flue gas pipeline 93 is lower than that of the flue gas in the recooling device 9, and it can be understood that the flue gas in the low-temperature flue gas pipeline 93 is subjected to cooling treatment in the cryogenic system 4, so that the temperature of the low-temperature flue gas is below-10 ℃, and the temperature of the flue gas introduced into the recooling device 9 from the water cooler 8 is 60-90 ℃.
It can be understood that the cryogenic system 4 needs to consume energy when cooling the flue gas, and the low-temperature flue gas (with the temperature of below-10 ℃) processed by the second low-temperature adsorption tower 5 is used for cooling the flue gas (with the temperature of 60 ℃ -90 ℃) in the recooler 9, so that the energy consumed when cooling the flue gas of the cryogenic system 4 is fully utilized, and the utilization rate of the energy is improved.
In other embodiments, as shown in fig. 2, the low-temperature desulfurization and denitrification system for flue gas of a biomass power plant according to the embodiment of the utility model further includes a chimney 6, and an inlet 61 of the chimney 6 is communicated with the fourth flue gas outlet 52 so as to discharge flue gas. Specifically, the flue gas subjected to denitration treatment in the second cryoadsorption tower 5 enters the chimney 6 through the inlet 61 of the chimney 6, and the flue gas is discharged to the outside from the outlet 62 of the chimney 6.
The eighth flue gas outlet 932 communicates with the inlet 61 of the chimney 6, so that the inlet 61 of the chimney 6 communicates with the fourth flue gas outlet 52 for discharging flue gas. Specifically, the low-temperature flue gas in the low-temperature flue gas pipeline 93 is discharged from the eighth flue gas outlet 932 after heat exchange, enters the chimney 6 from the inlet 61 of the chimney 6, and is discharged to the outside through the outlet.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the utility model.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (8)

1. The utility model provides a low temperature SOx/NOx control system for biomass power plant's flue gas which characterized in that includes:
a biomass boiler including a flue gas discharge port;
the refrigerating system comprises a first flue gas inlet and a first flue gas outlet, and the flue gas discharge port is communicated with the first flue gas inlet so as to introduce the flue gas into the refrigerating system and reduce the temperature of the flue gas to 5-15 ℃;
the first low-temperature adsorption tower comprises a second flue gas inlet and a second flue gas outlet, and the first flue gas outlet is communicated with the second flue gas inlet so as to introduce the flue gas into the first low-temperature adsorption tower to desulfurize the flue gas;
the cryogenic system comprises a third flue gas inlet and a third flue gas outlet, and the second flue gas outlet is communicated with the third flue gas inlet so as to introduce the flue gas into the cryogenic system, so that the temperature of the flue gas is reduced to below-10 ℃; and
and the second low-temperature adsorption tower comprises a fourth flue gas inlet and a fourth flue gas outlet, and the third flue gas outlet is communicated with the fourth flue gas inlet so as to introduce the flue gas into the second low-temperature adsorption tower, thereby denitrating the flue gas.
2. The low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant according to claim 1, further comprising an economizer, wherein the economizer comprises a fifth flue gas inlet and a fifth flue gas outlet, the flue gas discharge port is communicated with the fifth flue gas inlet so as to introduce the flue gas into the economizer, thereby reducing the temperature of the flue gas to 120-150 ℃,
and the fifth flue gas outlet is communicated with the first flue gas inlet so that the flue gas discharge port is communicated with the first flue gas inlet.
3. The low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant of claim 2, further comprising a water cooler, wherein the water cooler comprises a sixth flue gas inlet and a sixth flue gas outlet, the fifth flue gas outlet is communicated with the sixth flue gas inlet so as to introduce the flue gas into the water cooler, thereby reducing the temperature of the flue gas to 60-90 ℃,
and the sixth flue gas outlet is communicated with the first flue gas inlet so that the fifth flue gas outlet is communicated with the first flue gas inlet.
4. The low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant according to claim 3, wherein the water cooler further comprises a cooling water pipeline, and the cooling water pipeline is used for introducing cooling water so as to exchange heat with the flue gas, so that the temperature of the flue gas is reduced to 60-90 ℃.
5. The low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant of claim 3, further comprising a recooler, wherein the recooler comprises a seventh flue gas inlet and a seventh flue gas outlet, and the sixth flue gas outlet is communicated with the seventh flue gas inlet so as to introduce the flue gas into the recooler, thereby reducing the temperature of the flue gas to 30-60 ℃,
the seventh flue gas outlet is communicated with the first flue gas inlet so that the sixth flue gas outlet is communicated with the first flue gas inlet.
6. The low temperature desulfurization and denitrification system for the flue gas of the biomass power plant of claim 5, wherein the recooling device comprises a low temperature flue gas pipeline, the low temperature flue gas pipeline comprises an eighth flue gas inlet and an eighth flue gas outlet, the fourth flue gas outlet is communicated with the eighth flue gas inlet so as to introduce the flue gas into the low temperature flue gas pipeline to cool the recooling device,
the eighth flue gas outlet is in communication with the inlet of the chimney, such that the inlet of the chimney is in communication with the fourth flue gas outlet for discharging the flue gas.
7. The low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant of claim 3, further comprising a dust remover, wherein the dust remover comprises a gas inlet and a gas outlet, the gas inlet is communicated with the fifth flue gas outlet so as to introduce the flue gas into the dust remover,
and the gas outlet is communicated with the sixth flue gas inlet, so that the fifth flue gas outlet is communicated with the sixth flue gas inlet.
8. The low-temperature desulfurization and denitrification system for the flue gas of the biomass power plant according to claim 7, further comprising an induced draft fan, wherein the induced draft fan is arranged between the water cooler and the dust remover, an air inlet of the induced draft fan is communicated with the air outlet, and an air outlet of the induced draft fan is communicated with the sixth flue gas inlet, so that the sixth flue gas inlet is communicated with the air outlet.
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WO2023050896A1 (en) * 2021-09-28 2023-04-06 中国华能集团清洁能源技术研究院有限公司 Low-temperature desulfurization and denitrification system for flue gas of biomass power plant

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CN110743313A (en) * 2019-10-29 2020-02-04 中国华能集团有限公司 Low-temperature flue gas adsorption denitration method
CN111569604A (en) * 2020-05-18 2020-08-25 中国华能集团有限公司 Low-temperature flue gas adsorption desulfurization method
CN112268293A (en) * 2020-11-11 2021-01-26 西安热工研究院有限公司 Large-scale thermal power generating unit flue gas active coke purification system and method
CN113769551B (en) * 2021-09-28 2023-07-28 中国华能集团清洁能源技术研究院有限公司 Low-temperature desulfurization and denitrification method and system for biomass power plant flue gas
CN216537812U (en) * 2021-09-28 2022-05-17 中国华能集团清洁能源技术研究院有限公司 Low-temperature desulfurization and denitrification system for flue gas of biomass power plant

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WO2023050896A1 (en) * 2021-09-28 2023-04-06 中国华能集团清洁能源技术研究院有限公司 Low-temperature desulfurization and denitrification system for flue gas of biomass power plant

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