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

Abstract

The utility model discloses a low-temperature desulfurization and denitrification system for biomass power plant flue gas. The low-temperature desulfurization and denitrification system for biomass power plant flue gas comprises: a biomass boiler, a refrigeration system, a first low-temperature adsorption tower, a deep a refrigeration system and a second low-temperature adsorption tower; the refrigeration system includes 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; the first low-temperature adsorption tower includes a second flue gas inlet and a second flue gas outlet, the first flue gas outlet communicates with the second flue gas inlet; the cryogenic system includes a third flue gas inlet and a third flue gas outlet, the first The second flue gas outlet communicates with the third flue gas inlet; the second low-temperature adsorption tower includes a fourth flue gas inlet and a fourth flue gas outlet, and the third flue gas outlet communicates with the fourth flue gas inlet . The low-temperature desulfurization and denitrification system for biomass power plant flue gas of the utility model has the advantages of high denitrification rate and high desulfurization rate.

Description

Low temperature desulfurization and denitrification system for biomass power plant flue gas

technical field

The utility model relates to the technical field of gas purification, in particular to a low-temperature desulfurization and denitration system for the flue gas of biomass power plants.

Background technique

Biomass power plants are boilers that use biomass energy as fuel. Wastes in the agricultural production process, such as crop straw and agricultural processing industry waste, can be used as fuel for biomass power plants. Therefore, compared with coal-fired power plants, Biomass energy has the advantages of renewability, low pollution, and abundant raw material sources. The flue gas produced by biomass boilers contains low pollutants such as sulfur dioxide and nitrogen oxides. In the related art, the flue gas produced by biomass power plants is desulfurized and denitrified under high temperature conditions, but the desulfurization and denitrification efficiency is low.

Utility model content

This utility model is made based on the inventor's discovery and understanding of the following facts and problems:

The desulfurization efficiency of the related art is generally up to 70%. The desulfurizer is limestone. The limestone is decomposed into calcium oxide and carbon dioxide at high temperature, and the SO2 in the flue gas is removed by chemical reaction. In the related art, the efficiency of calcium injection desulfurization in the furnace by using this method is about 60% to 65%, so the desulfurization efficiency is low.

The related technology is to inject NH3, urea and other reducing agents into the boiler furnace for selective reaction with NOx without catalyst, and the reducing agent must be added under high temperature conditions. The reducing agent is thermally decomposed into NH3, which reacts with NOx in the flue gas to generate N2 and water, and then denitrify the flue gas. The denitration efficiency of the related technology is generally 30%-80%, which is greatly affected by the temperature of the boiler furnace. The denitration efficiency of the related art can reach 60% above 850°C, and reaches the maximum value at 900°C, so the denitration efficiency is low.

The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

To this end, the embodiment of the present invention proposes a low temperature desulfurization and denitrification system for biomass power plant flue gas. The low temperature desulfurization and denitration system for biomass power plant flue gas has the advantages of high denitration rate and high desulfurization rate.

The low-temperature desulfurization and denitrification system for biomass power plant flue gas according to the embodiment of the present invention includes: a biomass boiler, the biomass boiler includes a flue gas discharge port; a refrigeration system, the refrigeration system includes a first flue gas inlet and a a first flue gas outlet, the flue gas discharge port is communicated with the first flue gas inlet, so as to pass the flue gas into the refrigeration system, so as to reduce the temperature of the flue gas to 5°C-15°C; the first A low-temperature adsorption tower, the first low-temperature adsorption tower includes a second flue gas inlet and a second flue gas outlet, and the first flue gas outlet communicates with the second flue gas inlet, so as to pass the flue gas into the into the first low-temperature adsorption tower to desulfurize the flue gas; a cryogenic system, the cryogenic system includes a third flue gas inlet and a third flue gas outlet, and the second flue gas outlet is connected to the first The three flue gas inlets are connected to pass the flue gas into the cryogenic system, thereby reducing the temperature of the flue gas to below -10°C; and a second low-temperature adsorption tower, the second low-temperature adsorption tower includes a fourth flue gas A gas inlet and a fourth flue gas outlet, the third flue gas outlet is communicated with the fourth flue gas inlet, so that the flue gas is passed into the second low-temperature adsorption tower, so that the flue gas is subjected to denitrification.

The low-temperature desulfurization and denitrification system for biomass power plant flue gas according to the embodiment of the present invention cools the flue gas through the refrigeration system, and reduces the temperature of the flue gas to 5°C-15°C, and the low temperature (temperature is 5°C-15°C) The flue gas is desulfurized in the first low-temperature adsorption tower, and the flue gas has high desulfurization efficiency under the low temperature condition of 5°C-15°C, thus increasing the low-temperature desulfurization and denitrification system for biomass power plant flue gas according to the embodiment of the present invention. Desulfurization rate. The flue gas after desulfurization treatment by the first low-temperature adsorption tower is cooled again by the cryogenic system, and the temperature of the flue gas is lowered to below -10°C. The denitrification treatment is carried out in the low temperature adsorption tower, and the flue gas desulfurization efficiency is high under the low temperature condition below -10°C, so the denitration rate of the low temperature desulfurization and denitrification system for biomass power plant flue gas according to the embodiment of the present invention is increased.

Therefore, the low-temperature desulfurization and denitrification system used for the flue gas of the biomass power plant according to the embodiment of the present invention has the advantages of high denitrification rate and high desulfurization rate.

In some embodiments, the low-temperature desulfurization and denitrification system for biomass power plant flue gas according to the embodiment of the present invention further includes an economizer, the economizer includes a fifth flue gas inlet and a fifth flue gas outlet, the The flue gas discharge port is communicated with the fifth flue gas inlet, so as to pass the flue gas into the economizer, so as to reduce the temperature of the flue gas to 120°C-150°C, and the fifth smoke The gas outlet communicates with the first flue gas inlet so that the flue gas discharge port communicates with the first flue gas inlet.

In some embodiments, the low-temperature desulfurization and denitrification system for biomass power plant flue gas according to the embodiment of the present invention further includes a water cooler, the water cooler includes a sixth flue gas inlet and a sixth flue gas outlet, the fifth The flue gas outlet is communicated with the sixth flue gas inlet, so as to pass the flue gas into the water cooler, so as to reduce the temperature of the flue gas to 60°C-90°C, the sixth flue gas outlet communicating with the first flue gas inlet, so that the fifth flue gas outlet communicates with the first flue gas inlet.

In some embodiments, the water cooler further includes a cooling water pipe, and the cooling water pipe is used for introducing cooling water to exchange heat with the flue gas, so that the temperature of the flue gas is lowered to 60°C- 90°C.

In some embodiments, the low-temperature desulfurization and denitrification system for biomass power plant flue gas according to the embodiment of the present invention further includes a recooler, and the recooler includes 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 pass the flue gas into the recooler, so as to reduce the temperature of the flue gas to 30°C-60°C, the seventh The flue gas outlet communicates with the first flue gas inlet so that the sixth flue gas outlet communicates with the first flue gas inlet.

In some embodiments, the recooler includes a low temperature flue gas duct, the low temperature flue gas duct includes an eighth flue gas inlet and an eighth flue gas outlet, the fourth flue gas outlet is connected to the eighth flue gas The inlet is communicated with the inlet of the chimney so as to pass the flue gas into the low-temperature flue gas duct to cool the recooler, and the eighth outlet of the flue gas is communicated with the inlet of the chimney, so that the inlet of the chimney is connected to the inlet of the chimney. The fourth flue gas outlet communicates to discharge the flue gas.

In some embodiments, the low-temperature desulfurization and denitrification system for biomass power plant flue gas according to the embodiment of the present invention further includes a dust collector, the dust collector includes an air inlet and an air outlet, and the air inlet is connected to the first Five flue gas outlets are communicated so as to pass the flue gas into the dust collector, and the gas outlet is communicated with the sixth flue gas inlet so that the fifth flue gas outlet is connected to the sixth flue gas inlet Connected.

In some embodiments, the low-temperature desulfurization and denitrification system for biomass power plant flue gas according to the embodiment of the present invention further includes an induced draft fan, the induced draft fan is arranged between the water cooler and the dust collector, and the induced draft fan is arranged between the water cooler and the dust collector. The air inlet of the fan is communicated with the air outlet, and the 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 biomass power plant flue gas according to any of the above embodiments further includes a chimney, the inlet of the chimney is in communication with the fourth flue gas outlet, so as to discharge the flue gas.

Description of drawings

FIG. 1 is a schematic structural diagram of a low-temperature desulfurization and denitrification system for biomass power plant flue gas according to an embodiment of the present invention.

2 is a schematic structural diagram of a low-temperature desulfurization and denitrification system for biomass power plant flue gas according to an embodiment of the present invention.

Reference number:

Biomass boiler 1; flue gas discharge port 11;

Refrigeration system 2; first flue gas inlet 21; first flue gas outlet 22;

The first low temperature adsorption tower 3; the second flue gas inlet 31; the second flue gas outlet 32;

Cryogenic system 4; third flue gas inlet 41; third flue gas outlet 42;

The second low temperature adsorption tower 5; the fourth flue gas inlet 51; the fourth flue gas outlet 52;

Chimney 6; Inlet 61; Outlet 62;

Economizer 7; fifth flue gas inlet 71; fifth flue gas outlet 72;

Water cooler 8; sixth flue gas inlet 81; sixth flue gas outlet 82;

Refrigerator 9; seventh flue gas inlet 91; seventh flue gas outlet 92; low temperature flue gas pipeline 93; eighth flue gas inlet 931; eighth flue gas outlet 932;

Dust collector 10; air inlet 101; air outlet 102; dust outlet 103;

The induced draft fan 20; the air inlet 201; the air outlet 202.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to be used to explain the present invention, but should not be construed as a limitation of the present invention.

The low-temperature desulfurization and denitrification system for the flue gas of biomass power plants according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in Figures 1-2, the low-temperature desulfurization and denitrification system for biomass power plant flue gas according to an embodiment of the present invention includes a biomass boiler 1, a refrigeration system 2, a first low-temperature adsorption tower 3, a cryogenic system 4 and The second low temperature adsorption tower 5 .

The biomass boiler 1 includes a flue gas discharge port 11 . Specifically, biomass fuel is sent to the biomass boiler 1 for incineration, and the flue gas generated by the incineration is discharged from the flue gas discharge port 11 .

The refrigeration system 2 includes a first flue gas inlet 21 and a first flue gas outlet 22, and the flue gas discharge port 11 communicates with the first flue gas inlet 21, so as to pass the flue gas into the refrigeration system 2, thereby reducing the temperature of the flue gas. to 5°C-15°C.

Specifically, as shown in FIG. 1 , after the flue gas burned by the biomass boiler 1 is discharged from the flue gas discharge port 11 , it 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 treatment is 5°C-15°C. The cooled flue gas is discharged from the first flue gas outlet 22 to the refrigeration system 2 .

The first low temperature adsorption tower 3 includes 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 pass 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 that has undergone cooling treatment enters the first low-temperature adsorption tower 3 from the second flue gas inlet 31 , and the flue gas undergoes desulfurization treatment in the first low-temperature adsorption tower 3 , and passes through the first low-temperature adsorption. The flue gas after desulfurization in the tower 3 is discharged from the second flue gas outlet 32 to the first low-temperature adsorption tower 3 .

It can be understood that the height of the first low-temperature adsorption tower 3 is large, so that the flue gas in the first low-temperature adsorption tower 3 can fully react in the first low-temperature adsorption tower 3. Therefore, the The desulfurization rate of the low-temperature desulfurization and denitrification system for the flue gas of biomass power plants is increased.

In addition, the first low-temperature adsorption tower 3 is provided with activated carbon for desulfurization. The activated carbon has a catalytic effect on the reaction of sulfur-containing compounds and oxygen in the flue gas, and the surface of the activated carbon has micropores, which can adsorb sulfur-containing compounds and oxygen. The product after the reaction can achieve the effect of desulfurization.

The cryogenic system 4 includes a third flue gas inlet 41 and a third flue gas outlet 42, and the second flue gas outlet 32 communicates with the third flue gas inlet 41, so as to pass the flue gas into the cryogenic system 4, so as to discharge the flue gas. temperature drops below -10°C.

Specifically, as shown in FIG. 1 , the flue gas that has undergone desulfurization treatment enters the cryogenic system 4 from the third flue gas inlet 41 , and the flue gas is cooled again in the cryogenic system 4 , wherein the flue gas after the cooling treatment The temperature is below -10°C, and the cooled flue gas is discharged from the third flue gas outlet 42 to the cryogenic system 4 .

The second low temperature adsorption tower 5 includes 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 pass the flue gas into the second low temperature adsorption tower 5, Thereby denitrifying the flue gas.

Specifically, as shown in FIG. 1 , the flue gas cooled by the cryogenic system 4 enters the second low temperature adsorption tower 5 from the fourth flue gas inlet 51 , and the flue gas is denitrified in the second low temperature adsorption tower 5 . The denitrified flue gas is discharged from the fourth flue gas outlet 52 to the second low-temperature adsorption tower 5 .

It can be understood that the second low-temperature adsorption tower 5 is provided with activated coke, and the surface of the activated coke has micropores, which can adsorb nitrogen oxides in the sulfur-containing flue gas. In addition, activated coke can produce a catalytic reduction reaction for NO in flue gas, and reduce NO to N2 under the action of reducing agent NH3, thereby achieving the purpose of denitration and deamination.

The low-temperature desulfurization and denitrification system for the flue gas of biomass power plants according to the embodiment of the present invention cools the flue gas through the refrigeration system 2, and reduces the temperature of the flue gas to 5°C-15°C, and the low temperature (temperature between 5°C-15°C) ) The flue gas is desulfurized in the first low-temperature adsorption tower 3, and the flue gas has a high desulfurization efficiency under the low temperature condition of 5°C-15°C, so the low-temperature desulfurization and denitrification of the flue gas used in the biomass power plant in the embodiment of the present utility model is increased. The desulfurization rate of the system. The flue gas after desulfurization treatment in the first low-temperature adsorption tower 3 is cooled again by the cryogenic system 4, and the temperature of the flue gas is lowered to below -10°C. The denitrification treatment is carried out in the second low temperature adsorption tower 5, and the flue gas has high desulfurization efficiency under the low temperature condition below -10°C, thus increasing the denitrification rate of the low temperature desulfurization and denitrification system for the flue gas of the biomass power plant according to the embodiment of the present invention .

Therefore, the low-temperature desulfurization and denitrification system used for the flue gas of the biomass power plant according to the embodiment of the present invention 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. It can be understood that the first low-temperature adsorption tower 3 reacts with the flue gas to desulfurize the flue gas. Therefore, the first low-temperature adsorption tower 3 performs desulfurization treatment on the flue gas. 3 Can remove sulfur-containing compounds in flue gas. Wherein, the first low-temperature adsorption tower 3 performs desulfurization treatment on the flue gas including dry desulfurization and semi-dry desulfurization.

Optionally, use dry desulfurization to remove sulfur-containing compounds in the flue gas, wherein dry slaked lime is used as an absorbent to react the flue gas in the first low-temperature adsorption tower 3 with dry slaked lime, and then remove the sulfur-containing compounds in the flue gas. . Alternatively, semi-dry desulfurization is used to remove sulfur-containing compounds in soot. Among them, the slaked lime slurry is sprayed in the first low-temperature adsorption tower 3, so that the slaked lime slurry is evenly distributed in the first low-temperature adsorption tower 3 in the first low-temperature adsorption tower 3, so that the flue gas and the slaked lime in the first low-temperature adsorption tower 3 The reaction is carried out to remove sulfur-containing compounds in the flue gas.

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 present invention further includes an economizer 7 .

The economizer 7 includes a fifth flue gas inlet 71 and a fifth flue gas outlet 72, and the flue gas discharge port 11 communicates with the fifth flue gas inlet 71, so as to pass the flue gas into the economizer 7, so that the flue gas is When the temperature drops to 120°C-150°C, the fifth flue gas outlet 72 communicates with the first flue gas inlet 21 , so that the flue gas discharge port 11 communicates 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, and enters the economizer 7 through the fifth flue gas outlet 72, and the flue gas is cooled in the economizer 7 to reduce the temperature to 120°C-150°C, the cooled flue gas 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 flue gas is cooled in the economizer 7 by exchanging heat with the flue gas through the economizer 7 , so that the economizer 7 absorbs part of the heat of the flue gas, thereby reducing the temperature of the flue gas. In addition, the economizer 7 absorbs the heat of the high-temperature flue gas, and heats the refrigerant in the economizer 7, and the heat of the heated refrigerant can provide energy for other devices, and then reuse the absorbed heat, thus improving the performance of the economizer. energy utilization.

In some embodiments, the low temperature desulfurization and denitrification system for the flue gas of biomass power plants according to the embodiment of the present invention further includes a water cooler 8 .

The water cooler 8 includes a sixth flue gas inlet 81 and a sixth flue gas outlet 82, and the fifth flue gas outlet 72 communicates with the sixth flue gas inlet 81, so as to pass the flue gas into the water cooler 8, so as to make the temperature of the flue gas When the temperature drops to 60°C-90°C, the sixth flue gas outlet 82 is communicated with the first flue gas inlet 21, so that the fifth flue gas outlet 72 is communicated with the first flue gas inlet 21, that is to say, the water cooler 8 is set in the province. Between the coal burner 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 the water cooler 8, wherein the temperature of the flue gas after being cooled by the water cooler 8 is 60°C-90°C. 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 the fifth flue gas outlet 72 communicates with the first flue gas inlet 21 .

It can be understood that the flue gas cooled by the economizer 7 is passed into the water cooler 8 to be cooled again, so that the temperature of the flue gas is reduced to 60°C-90°C, and then the flue gas is passed into the refrigeration system 2. , thereby reducing the load of the refrigeration system 2 , thus increasing the service life of the refrigeration system 2 .

Further, the water cooler 8 also includes a cooling water pipe, and the cooling water pipe is used for introducing cooling water so as to exchange heat with the flue gas, thereby reducing the temperature of the flue gas to 60°C-90°C.

In some embodiments, as shown in FIG. 2 , the low-temperature desulfurization and denitrification system for the flue gas of a biomass power plant according to the embodiment of the present invention further includes a precipitator 10, and the precipitator 10 includes an air inlet 101 and an air outlet 102. The port 101 communicates with the fifth flue gas outlet 72 to pass the flue gas into the dust collector 10 , and the gas outlet 102 communicates with the sixth flue gas inlet 81 so that the fifth flue gas outlet 72 communicates with the sixth flue gas inlet 81 .

Specifically, the flue gas processed by the economizer 7 is discharged from the fifth flue gas outlet 72, and enters the dust collector 10 through the air inlet 101, and the dust collector 10 performs dust removal treatment on the flue gas, wherein the dust collector 10 can remove the smoke The smoke and dust in the air are discharged from the air outlet 102 of the dust collector 10 after being dedusted.

In addition, the dust collector 10 further includes a dust outlet 103, and the dust removed from the flue gas is discharged from the dust outlet 103 of the dust collector 10, thereby avoiding secondary pollution to the flue gas caused by the residual smoke and dust of the dust collector 10.

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 present invention further includes an induced draft fan 20, and the induced draft fan 20 is arranged between the water cooler 8 and the dust collector 10, The air inlet 201 of the induced draft fan communicates with the air outlet 102 , and the air outlet 202 of the induced draft fan communicates with the sixth flue gas inlet 81 , so that the sixth flue gas inlet 81 is communicated with the gas 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 a rotatable fan blade, and the fan blade rotates to speed up the flow rate of the flue gas, so the induced draft fan 20 can speed up the flue gas in the low temperature desulfurization and denitration system for the flue gas of the biomass power plant according to the embodiment of the present invention. air circulation speed.

In some embodiments, as shown in FIG. 2 , the low-temperature desulfurization and denitrification system for the flue gas of biomass power plants according to the embodiment of the present invention further includes a recooler 9 .

The recooler 9 includes a seventh flue gas inlet 91 and a seventh flue gas outlet 92, and the sixth flue gas outlet 82 communicates with the seventh flue gas inlet 91, so as to pass the flue gas into the recooler 9, so that the flue gas is When the temperature drops to 30°C-60°C, the seventh flue gas outlet 92 communicates with the first flue gas inlet 21 , so that the sixth flue gas outlet 82 communicates with the first flue gas inlet 21 .

Specifically, the flue gas cooled by the water cooler 8 enters the recooler 9 from the seventh flue gas inlet 91, and the flue gas is cooled in the recooler 9, wherein the recooler 9 reduces the temperature of the flue gas to 30℃-60℃. The flue gas cooled by the recooler 9 is discharged from the seventh flue gas outlet 92 , and then enters the refrigeration system 2 through the first flue gas inlet 21 .

It can be understood that the flue gas cooled by the water cooler 8 is passed into the recooler 9 for cooling again, so that the temperature of the flue gas is reduced to 30°C-60°C, and then the flue gas is passed into the refrigeration system 2. , thereby reducing the load of the refrigeration system 2 , thus increasing the service life of the refrigeration system 2 .

Further, the recooler 9 includes a low-temperature flue gas duct 93, the low-temperature flue gas duct 93 includes an eighth flue gas inlet 931 and an eighth flue gas outlet 932, and the fourth flue gas outlet 52 communicates with the eighth flue gas inlet 931, so that The flue gas is passed into the low-temperature flue gas pipeline 93 to cool the recooler 9 .

Specifically, the flue gas after denitration treatment by the second low-temperature adsorption tower 5 is discharged from the fourth flue gas outlet 52, and enters the recooler 9 through the eighth flue gas inlet 931 of the low-temperature flue gas pipeline 93, and the low-temperature flue gas pipeline The low-temperature flue gas in 93 and the flue gas in the recooler 9 (the flue gas after cooling by the water cooler 8, the temperature of the flue gas is 60 ℃-90 ℃) conduct heat exchange, and then the flue gas in the recooler 9 is exchanged. The temperature drops to 30℃-60℃. The temperature of the flue gas in the low-temperature flue gas duct 93 is lower than the temperature of the flue gas in the recooler 9. It can be understood that the flue gas in the low-temperature flue gas duct 93 is subjected to overcooling treatment in the cryogenic system 4, so the low-temperature flue gas The temperature is below -10°C, while the temperature of the flue gas passed into the recooler 9 from the water cooler 8 is 60°C-90°C.

It can be understood that the cryogenic system 4 needs to consume energy when cooling the flue gas, and the low-temperature flue gas (temperature below -10°C) treated by the second low-temperature adsorption tower 5 is used to cool the flue gas ( The temperature is 60°C-90°C) to cool down, so the energy consumed when the flue gas of the cryogenic system 4 is cooled down 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 used for the flue gas of biomass power plants according to the embodiment of the present invention further includes a chimney 6 , and the inlet 61 of the chimney 6 is communicated with the fourth flue gas outlet 52 so as to discharge smoke. Specifically, the flue gas after denitration treatment by the second low temperature adsorption 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 so as to discharge the fumes. Specifically, the low-temperature flue gas in the low-temperature flue gas duct 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 should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axial" The orientation or positional relationship indicated by , "radial direction", "circumferential direction", etc. are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying the indicated device. Or the elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present utility model, unless otherwise expressly specified and limited, the terms "installation", "connection", "connection", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integration; it can be mechanical connection, electrical connection or communication with each other; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal communication between two elements or the interaction relationship between the two elements , unless otherwise expressly qualified. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and defined, a first feature "on" or "under" a second feature may be in direct contact with the first and second features, or the first and second features through an intermediary indirect contact. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In this application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean the specific features, structures, materials described in connection with the embodiment or example Or features are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed 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, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limitations of the present invention, and those of ordinary skill in the art are within the scope of the present invention Variations, modifications, substitutions and variations can be made to the above-described embodiments.

Claims (8)

1. a low-temperature desulfurization and denitrification system for biomass power plant flue gas, characterized in that, comprising: a biomass boiler, the biomass boiler includes a flue gas discharge port; A refrigeration system, the refrigeration system includes 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 pass the flue gas into the refrigeration system, so as to discharge the flue gas into the refrigeration system. The temperature of the flue gas drops to 5℃-15℃; A first low-temperature adsorption tower, the first low-temperature adsorption tower includes a second flue gas inlet and a second flue gas outlet, and the first flue gas outlet communicates with the second flue gas inlet, so as to pass the flue gas through into the first low-temperature adsorption tower to desulfurize the flue gas; a cryogenic system, the cryogenic system includes a third flue gas inlet and a third flue gas outlet, and the second flue gas outlet communicates with the third flue gas inlet so as to pass flue gas into the cryogenic system inside, thereby reducing the temperature of the flue gas to below -10°C; and A second low-temperature adsorption tower, the second low-temperature adsorption tower includes a fourth flue gas inlet and a fourth flue gas outlet, and the third flue gas outlet communicates with the fourth flue gas inlet, so as to allow the flue gas to pass through into the second low-temperature adsorption tower to denitrify the flue gas. 2. The low-temperature desulfurization and denitrification system for biomass power plant flue gas 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 pass the flue gas into the economizer, so as to reduce the temperature of the flue gas to 120°C-150°C, The fifth flue gas outlet communicates with the first flue gas inlet, so that the flue gas discharge port communicates with the first flue gas inlet. 3. The low-temperature desulfurization and denitration system for biomass power plant flue gas according to claim 2, further comprising a water cooler, the water cooler comprising a sixth flue gas inlet and a sixth flue gas outlet, the The fifth flue gas outlet is communicated with the sixth flue gas inlet, so as to pass the flue gas into the water cooler, so as to reduce the temperature of the flue gas to 60°C-90°C, The sixth flue gas outlet communicates with the first flue gas inlet, so that the fifth flue gas outlet communicates with the first flue gas inlet. 4. The low-temperature desulfurization and denitrification system for biomass power plant flue gas according to claim 3, wherein the water cooler further comprises a cooling water pipe, and the cooling water pipe is used for introducing cooling water, so as to be connected with the cooling water. The flue gas exchanges heat, thereby reducing the temperature of the flue gas to 60°C-90°C. 5. The low-temperature desulfurization and denitrification system for biomass power plant flue gas according to claim 3, characterized in that, further comprising a recooler, and 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 pass the flue gas into the recooler, so as to reduce the temperature of the flue gas to 30°C-60°C, The seventh flue gas outlet communicates with the first flue gas inlet, so that the sixth flue gas outlet communicates with the first flue gas inlet. 6. The low-temperature desulfurization and denitrification system for biomass power plant flue gas according to claim 5, wherein the recooler comprises a low-temperature flue gas pipeline, and 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 pass the flue gas into the low-temperature flue gas duct, thereby cooling the recooler, The eighth flue gas outlet communicates with the inlet of the chimney, so that the inlet of the chimney communicates with the fourth flue gas outlet, so as to discharge the flue gas. 7. The low-temperature desulfurization and denitrification system for biomass power plant flue gas according to claim 3, further comprising a dust collector, the dust collector comprises an air inlet and an air outlet, and the air inlet is connected to the the fifth flue gas outlet is communicated so as to pass the flue gas into the dust collector, The gas outlet communicates with the sixth flue gas inlet, so that the fifth flue gas outlet communicates with the sixth flue gas inlet. 8. The low-temperature desulfurization and denitrification system for biomass power plant flue gas according to claim 7, further comprising an induced draft fan, wherein the induced draft fan is arranged between the water cooler and the dust collector, so that the The air inlet of the induced draft fan is communicated with the air outlet, and the 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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