WO2023050897A1 - Flue gas low-temperature desulfurization and denitrification system for rotary kiln combustion furnace of garbage power plant - Google Patents

Abstract

A flue gas low-temperature desulfurization and denitrification system for a rotary kiln combustion furnace of a garbage power plant. The system comprises a rotary kiln combustion furnace (1), a waste heat boiler (2), an absorption refrigeration unit (3), a desulfurization tower (4), and a low-temperature adsorption tower (5), wherein the absorption refrigeration unit (3) comprises a steam generator (31) and an evaporator (32); a flue gas discharge port (11) of the rotary kiln combustion furnace (1) is in communication with a first flue gas inlet (21) of the waste heat boiler (2); a first flue gas outlet (22) of the waste heat boiler (2) is in communication with a second flue gas inlet (311) of the steam generator (31); a second flue gas outlet (312) of the steam generator (31) is in communication with a fourth flue gas inlet (41) of the desulfurization tower (4); a fourth flue gas outlet (42) of the desulfurization tower (4) is in communication with a third flue gas inlet (321) of the evaporator (32); a third flue gas outlet (322) of the evaporator (32) is in communication with a fifth flue gas inlet (51) of the low-temperature adsorption tower (5); and treated flue gas is discharged to the outside from a fifth flue gas outlet (52) of the low-temperature adsorption tower (5). The flue gas low-temperature desulfurization and denitrification system for a rotary kiln combustion furnace of a garbage power plant has the advantages of a high desulfurization rate and a high denitration rate.

Description

Low-temperature desulfurization and denitrification system for flue gas of rotary kiln combustion furnace in waste power plant

cross reference

This application claims the priority of the Chinese patent application submitted to the State Intellectual Property Office of China on September 28, 2021, the application number is 202122371166.2, and the invention title is "Low-temperature desulfurization and denitrification system for flue gas from rotary kiln combustion furnace of waste power plant", the entire content of which Incorporated in this application by reference.

technical field

This application relates to the technical field of gas purification, in particular to a low-temperature desulfurization and denitrification system for flue gas from a rotary kiln combustion furnace in a waste power plant.

Background technique

Due to the complex composition of municipal solid waste, the composition of the flue gas produced during the combustion process is also extremely complex. Among them, the flue gas of the garbage power plant contains nitrogen oxides and sulfur dioxide, and the flue gas must be desulfurized and denitrified before being discharged. In related technologies, after the flue gas from the garbage power plant is discharged from the rotary kiln combustion furnace, the flue gas is directly denitrated at high temperature, and then desulfurized, and the denitrification efficiency is low.

Contents of the invention

This application is based on the inventor's discovery and recognition of the following facts and problems:

In related technologies, the denitrification reflection device is installed in the waste heat boiler. The raw material for denitrification is urea, and the urea is prepared into a certain concentration of urea solution, and then the urea solution is sprayed into the waste heat boiler furnace with a pump. There is a spray gun in the furnace to atomize the urea solution entering the furnace. The temperature in the furnace is around 1000°C. The high-temperature flue gas is fully mixed for a certain period of time in the furnace body of the misty urea solution. In the case of gaseous oxygen in the boiler, NOx reacts with misty urea solution; when the amount of NOx is half of the content of urea, the removal rate of nitrogen oxides is about 30%-50%, so the desulfurization rate is low .

This application aims to solve one of the technical problems in the related art at least to a certain extent.

For this reason, the embodiment of the present application proposes a low-temperature desulfurization and denitrification system for flue gas from a rotary kiln combustion furnace of a waste power plant.

The low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the garbage power plant according to the embodiment of the present application includes:

A rotary kiln combustion furnace, the rotary kiln combustion furnace includes a flue gas discharge port;

A waste heat boiler, the waste heat boiler includes a first flue gas inlet and a first flue gas outlet, and the flue gas discharge port communicates with the first flue gas inlet so as to pass flue gas into the waste heat boiler so that The flue gas heats the waste heat boiler, thereby reducing the temperature of the flue gas;

An absorption refrigerating unit, the absorption refrigerating unit includes a steam generator and an evaporator, the steam generator includes a second flue gas inlet and a second flue gas outlet, and the evaporator includes a third flue gas inlet and a third a flue gas outlet, the first flue gas outlet communicates with the second flue gas inlet, so as to pass the flue gas into the steam generator, thereby reducing the temperature of the flue gas;

A desulfurization tower, the desulfurization tower is provided with slaked lime for desulfurization, the desulfurization tower includes a fourth flue gas inlet and a fourth flue gas outlet, and the second flue gas outlet communicates with the fourth flue gas inlet, so that passing the flue gas into the desulfurization tower to desulfurize the flue gas,

The fourth flue gas outlet communicates with the third flue gas inlet, so as to pass the flue gas into the evaporator, thereby reducing the temperature of the flue gas;

A low-temperature adsorption tower, the low-temperature adsorption tower includes a fifth flue gas inlet and a fifth flue gas outlet, and the third flue gas outlet communicates with the fifth flue gas inlet so that the flue gas can be passed into the low-temperature In the adsorption tower, the flue gas is desulfurized and denitrified.

The waste heat power plant rotary kiln combustion furnace flue gas low-temperature desulfurization and denitrification system of the embodiment of the present application cools the flue gas through the waste heat boiler and the absorption refrigeration unit to reduce the temperature of the flue gas. After cooling, the flue gas is desulfurized in the desulfurization tower. The desulfurization efficiency of the final flue gas is high, so the desulfurization rate of the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the waste power plant in the embodiment of the present application is increased. The flue gas after the desulfurization treatment of the desulfurization tower is cooled again by the absorption refrigeration unit, and the flue gas after cooling is subjected to desulfurization and denitrification treatment in the low-temperature adsorption tower. The denitrification rate of the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the waste power plant in the embodiment of the present application.

In some embodiments, the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the waste power plant in the embodiment of the present application further includes a cooling tower, the cooling tower includes a sixth flue gas inlet and a sixth flue gas outlet, and the sixth flue gas The gas inlet is connected with the second flue gas inlet so that the flue gas can be passed into the cooling tower to reduce the temperature of the flue gas, and the sixth flue gas outlet is connected with the fourth flue gas inlet communicated, so that the second flue gas outlet communicates with the fourth flue gas inlet.

In some embodiments, the dust collector includes an air inlet and an air outlet, the air inlet communicates with the fourth flue gas outlet so as to pass the flue gas into the dust collector, and the air outlet It communicates with the third flue gas inlet, so that the fourth flue gas outlet communicates with the third flue gas inlet.

In some embodiments, the waste gas power plant rotary kiln combustion furnace flue gas low-temperature desulfurization and denitrification system of the embodiment of the present application further includes a precooler, the precooler includes a seventh flue gas inlet and a seventh flue gas outlet, and the first The seventh flue gas inlet communicates with the gas outlet so that the flue gas can be passed into the precooler to reduce the temperature of the flue gas; the seventh flue gas outlet is connected to the third flue gas inlet communicated so that the gas outlet communicates with the third flue gas inlet.

In some embodiments, the precooler includes a first heat exchange assembly and a second heat exchange assembly, the first heat exchange assembly includes the seventh flue gas inlet and the seventh flue gas outlet, the The second heat exchange component can be fed with low-temperature fluid, and the seventh flue gas inlet communicates with the gas outlet, so that the flue gas can be passed into the first heat exchange component, thereby reducing the temperature of the flue gas .

In some embodiments, the second heat exchange component has an eighth flue gas inlet and an eighth flue gas outlet, and the eighth flue gas inlet communicates with the fifth flue gas outlet so that the flue gas can pass through The second heat exchange component is used to make the flue gas form the low-temperature fluid.

In some embodiments, the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the garbage power plant according to the embodiment of the present application further includes an induced draft fan, which is arranged between the precooler and the dust collector, and the induced draft fan is arranged between the precooler and the dust collector. The air inlet of the fan communicates with the air outlet, and the air outlet of the induced fan communicates with the seventh flue gas inlet, so that the seventh flue gas inlet communicates with the air outlet.

In some embodiments, the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the garbage power plant in the embodiment of the present application further includes a chimney, and the chimney communicates with the fifth flue gas outlet or the eighth flue gas outlet for discharging the smoke.

In some embodiments, the waste heat boiler includes a flue gas pipeline, the flue gas pipeline includes the first flue gas inlet and the first flue gas outlet, and the flue gas pipeline is used to heat the waste heat boiler.

Description of drawings

Fig. 1 is a schematic structural diagram of a low-temperature desulfurization and denitrification system for flue gas from a rotary kiln combustion furnace in a waste-to-energy power plant according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a low-temperature desulfurization and denitrification system for flue gas from a rotary kiln combustion furnace in a waste-to-energy power plant according to an embodiment of the present application.

Reference signs:

Rotary kiln combustion furnace 1; flue gas discharge port 11;

Waste heat boiler 2; first flue gas inlet 21; first flue gas outlet 22;

Absorption refrigeration unit 3; steam generator 31; second flue gas inlet 311; second flue gas outlet 312; evaporator 32; third flue gas inlet 321; third flue gas outlet 322;

Desulfurization tower 4; fourth flue gas inlet 41; fourth flue gas outlet 42;

Low temperature adsorption tower 5; fifth flue gas inlet 51; fifth flue gas outlet 52;

Cooling tower 6; sixth flue gas inlet 61; sixth flue gas outlet 62;

Dust collector 7; air inlet 71; air outlet 72; dust outlet 73;

induced draft fan 8; the ninth flue gas inlet 81; the ninth flue gas outlet 82;

Precooler 9; first heat exchange component 91; seventh flue gas inlet 911; seventh flue gas outlet 912; second heat exchange component 92; eighth flue gas inlet 921; eighth flue gas outlet 922;

Detailed ways

Embodiments of the application are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary, and are intended to explain the present application, and should not be construed as limiting the present application.

The following describes the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the waste power plant according to the embodiment of the present application with reference to the accompanying drawings.

As shown in Figure 1, the low-temperature desulfurization and denitrification system of the rotary kiln combustion furnace flue gas of the waste power plant according to the embodiment of the present application includes a rotary kiln combustion furnace 1, a waste heat boiler 2, an absorption refrigeration unit 3, a desulfurization tower 4 and a low-temperature adsorption tower 5.

The rotary kiln combustion furnace 1 includes a flue gas discharge port 11. Specifically, the rotary kiln combustion furnace 1 has a flue gas discharge port 11, so that the high-temperature flue gas generated in the rotary kiln combustion furnace 1 (the temperature of the high-temperature flue gas is between 1100 ° C and 1200°C) is discharged from the flue gas discharge port 11 of the rotary kiln combustion furnace 1.

The waste heat boiler 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 waste heat boiler 2 so that the flue gas heats the waste heat boiler 2, thereby reducing the temperature of the flue gas. Specifically, the high-temperature flue gas discharged from the flue gas discharge port 11 of the rotary kiln combustion furnace 1 enters the waste heat boiler 2 through the first flue gas inlet 21 .

It can be understood that the heat exchange between the high-temperature flue gas and the waste heat boiler 2, and the heat exchange between the high-temperature flue gas and the water in the waste heat boiler 2 can reduce the temperature of the high-temperature flue gas, wherein the temperature of the high-temperature flue gas after reducing the temperature is 300°C -350°C, the cooled high-temperature flue gas is discharged from the first flue gas outlet 22 of the waste heat boiler 2 . In addition, the waste heat boiler 2 can absorb the heat of the high-temperature flue gas, thereby improving the utilization rate of the heat released by fuel combustion.

The absorption refrigeration unit 3 includes a steam generator 31 and an evaporator 32, the steam generator 31 includes a second flue gas inlet 311 and a second flue gas outlet 312, and the evaporator 32 includes a third flue gas inlet 321 and a third flue gas outlet 322, the first flue gas outlet 22 communicates with the second flue gas inlet 311, so as to pass the flue gas into the steam generator 31, thereby reducing the temperature of the flue gas.

Specifically, the flue gas discharged from the waste heat boiler 2 enters the steam generator 31 through the second flue gas inlet 311 of the steam generator 31, and the flue gas exchanges heat with the coolant in the steam generator 31, thereby evaporating the coolant. And absorb the heat of the flue gas, and further, the cooled flue gas is discharged from the second flue gas outlet 312 of the steam generator 31 .

The desulfurization tower 4 includes a fourth flue gas inlet 41 and a fourth flue gas outlet 42, the second flue gas outlet 312 communicates with the fourth flue gas inlet 41, so that the flue gas is passed into the desulfurization tower 4, thereby desulfurizing the flue gas .

Specifically, the flue gas discharged from the steam generator 31 enters the desulfurization tower 4 through the fourth flue gas inlet 41, and the flue gas is desulfurized in the desulfurization tower 4 to remove sulfur-containing compounds in the flue gas. After treatment, it is discharged from the fourth flue gas outlet 42 of the desulfurization tower 4 .

The fourth flue gas outlet 42 communicates with the third flue gas inlet 321 so as to pass the flue gas into the evaporator 32 to reduce the temperature of the flue gas. Specifically, the desulfurized flue gas is discharged through the fourth flue gas outlet 42 of the desulfurization tower 4, and enters the evaporator 32 from the third flue gas inlet 321 of the evaporator 32, so that the flue gas is separated from the refrigerant in the evaporator 32. heat exchange, thereby reducing the temperature of the flue gas.

Slaked lime is arranged in the desulfurization tower. Specifically, the desulfurization tower 4 desulfurizes the flue gas by reacting slaked lime with the flue gas, so the desulfurization tower can remove sulfur-containing compounds in the flue gas. Wherein, the desulfurization treatment of the flue gas by the desulfurization tower 4 includes dry desulfurization and semi-dry desulfurization.

Optionally, dry desulfurization is used to remove sulfur-containing compounds in flue dust, wherein dry slaked lime is used as an absorbent, and the flue gas in the desulfurization tower 4 is reacted with dry slaked lime, thereby removing sulfur-containing compounds in the flue gas. Alternatively, semi-dry desulfurization is used to remove sulfur compounds in the flue dust. Wherein, the slaked lime slurry is sprayed in the desulfurization tower 4, so that the slaked lime slurry is evenly distributed in the desulfurization tower 4, and the flue gas reacts with the slaked lime in the desulfurization tower 4, thereby removing sulfur compounds in the flue gas.

The low-temperature adsorption tower 5 includes the fifth flue gas inlet 51 and the fifth flue gas outlet 52, and the third flue gas outlet 322 communicates with the fifth flue gas inlet 51, so that the flue gas is passed into the low-temperature adsorption tower 5, thereby the flue gas For desulfurization and denitrification.

Specifically, the desulfurized flue gas that has been cooled is discharged through the third flue gas outlet 322 of the evaporator 32, and enters the low-temperature adsorption tower 5 from the fifth flue gas inlet 51 of the low-temperature adsorption tower 5 for desulfurization and denitration treatment. The desulfurized and denitrified flue gas is discharged to the outside through the fifth flue gas outlet 52 .

The waste heat power plant rotary kiln combustion furnace flue gas low-temperature desulfurization and denitrification system of the embodiment of the present application cools the flue gas through the waste heat boiler 2 and the absorption refrigeration unit 3 to reduce the temperature of the flue gas. After cooling, the flue gas is desulfurized in the desulfurization tower 4 , the desulfurization efficiency of the flue gas after cooling is high, so the desulfurization rate of the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the waste power plant in the embodiment of the present application is increased. The flue gas desulfurized by the desulfurization tower 4 is cooled again by the absorption refrigeration unit 3, and the flue gas after cooling is subjected to desulfurization and denitrification treatment in the low-temperature adsorption tower 5, and the desulfurization and desulfurization efficiency of the flue gas after cooling again is high, so The denitrification rate of the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the waste power plant in the embodiment of the present application is increased.

Therefore, the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the garbage power plant has the advantages of high desulfurization rate and high denitrification rate.

In some embodiments, as shown in FIG. 2 , the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the waste power plant in the embodiment of the present application further includes a cooling tower 6, and the cooling tower 6 includes a sixth flue gas inlet 61 and a sixth flue gas inlet 61. The outlet 62, the sixth flue gas inlet 61 communicates with the second flue gas inlet 311, so as to pass the flue gas into the cooling tower 6, thereby reducing the temperature of the flue gas, and the sixth flue gas outlet 62 communicates with the fourth flue gas inlet 41 , so that the second flue gas outlet 312 communicates with the fourth flue gas inlet 41 .

Specifically, the flue gas cooled by the steam generator 31 is discharged from the second flue gas inlet 311 , enters the cooling tower 6 through the sixth flue gas inlet 61 , and the flue gas is cooled in the cooling tower 6 . After being cooled by the cooling tower 6 , the flue gas is discharged through the sixth flue gas outlet 62 and enters the desulfurization tower 4 through the fourth flue gas inlet 41 .

It can be understood that when the temperature of the flue gas cooled by the steam generator 31 is between 180°C and 300°C, and between 300°C and 500°C, harmful substances such as dioxins are likely to be formed in the flue gas, which will pass through the steam generator 31 The cooled flue gas is passed into the cooling tower 6 for cooling, thereby suppressing the generation of dioxins, so that the flue gas discharged to the outside does not contain harmful substances dioxins, thereby achieving the purpose of environmental protection.

Therefore, the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the garbage power plant in the embodiment of the present application has the advantage of environmental protection.

In some embodiments, as shown in FIG. 2 , the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the waste power plant in the embodiment of the present application further includes a dust collector 7, and the dust collector 7 includes an air inlet 71 and an air outlet 72, and the air inlet The port 71 communicates with the fourth flue gas outlet 42 so as to pass the flue gas into the dust collector 7 , and the gas outlet 72 communicates with the third flue gas inlet 321 so that the fourth flue gas outlet 42 communicates with the third flue gas inlet 321 .

Specifically, the flue gas desulfurized by the desulfurization tower 4 is discharged from the fourth flue gas outlet 42, enters the dust collector 7 through the air inlet 71 of the dust collector 7, and the flue gas is subjected to dust removal treatment in the dust collector 7, and then removed The soot in the flue gas makes the flue gas discharged to the outside without soot, and then achieves the purpose of environmental protection.

Further, the dust collector 7 has a dust outlet 73, through which the smoke and dust filtered by the dust collector 7 are discharged, and then the filtered smoke and dust are recycled to avoid secondary pollution to the environment.

Therefore, the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the garbage power plant in the embodiment of the present application has the advantage of environmental protection.

In some embodiments, as shown in Figure 2, the low-temperature desulfurization and denitrification system for flue gas from the rotary kiln combustion furnace of the waste power plant in the embodiment of the present application further includes a precooler 9, and the precooler 9 includes a seventh flue gas inlet 911 and a seventh flue gas inlet 911. The flue gas outlet 912 and the seventh flue gas inlet 911 communicate with the gas outlet 72 so as to pass the flue gas into the precooler 9 to reduce the temperature of the flue gas. The seventh flue gas outlet 912 communicates with the third flue gas inlet 321 , so that the gas outlet 72 communicates with the third flue gas inlet 321 .

Specifically, the flue gas dedusted by the dust collector 7 is discharged from the gas outlet 72 of the dust collector 7, enters the precooler 9 through the seventh flue gas inlet 911 of the precooler 9, and the flue gas is cooled in the precooler 9. In the cooling process, the cooled flue gas is discharged through the seventh flue gas outlet 912 and enters the evaporator 32 through the third flue gas inlet 321 .

Further, the precooler 9 includes a first heat exchange assembly 91 and a second heat exchange assembly 92, the first heat exchange assembly 91 includes a seventh flue gas inlet 911 and a seventh flue gas outlet 912, and the second heat exchange assembly 92 can The low-temperature fluid is passed through, and the seventh flue gas inlet 911 communicates with the gas outlet 72, so as to pass the flue gas into the first heat exchange component 91, thereby reducing the temperature of the flue gas.

Specifically, the flue gas dedusted by the dust collector 7 enters the first heat exchange assembly 91 through the seventh flue gas inlet 911, and the flue gas in the first heat exchange assembly 91 and the low-temperature fluid in the second heat exchange assembly 92 Heat exchange is performed, thereby reducing the temperature of the flue gas in the first heat exchange assembly 91 . The cooled flue gas is discharged through the seventh flue gas outlet 912 of the first heat exchange component 91 , and enters the evaporator 32 through the third flue gas inlet 321 to be cooled again.

Further, the second heat exchanging assembly 92 has an eighth flue gas inlet 921 and an eighth flue gas outlet 922, and the eighth flue gas inlet 921 communicates with the fifth flue gas outlet 52, so that the flue gas passes into the second heat exchanging assembly 92 , so that the flue gas forms a low-temperature fluid.

Specifically, the flue gas desulfurized and denitrified by the low-temperature adsorption tower 5 is discharged through the fifth flue gas outlet 52 , and enters the second heat exchange assembly 92 through the eighth flue gas inlet 921 of the second heat exchange assembly 92 . It can be understood that the flue gas in the cryogenic adsorption tower 5 is cooled again through the evaporator 32, and then the temperature of the flue gas discharged from the cryogenic adsorption tower 5 is lower than that of the flue gas in the first heat exchange assembly 91. 5 The exhausted flue gas forms a low-temperature fluid, and the low-temperature fluid formed by the flue gas exchanges heat with the flue gas of the first heat exchange component 91 in the second heat exchange component 92, thereby reducing the temperature of the flue gas in the first heat exchange component 91. temperature. Therefore, the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the garbage power plant in the embodiment of the present application has the advantage of saving energy.

In some embodiments, as shown in FIG. 2 , the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the waste power plant in the embodiment of the present application further includes an induced draft fan 8, and the induced draft fan 8 is arranged between the precooler 9 and the dust collector 7 , the air inlet of the induced draft fan 8 communicates with the air outlet 72 , and the air outlet of the induced draft fan 8 communicates with the seventh flue gas inlet 911 , so that the seventh flue gas inlet 911 communicates with the air outlet 72 .

Specifically, the induced draft fan 8 has a ninth flue gas inlet 81 and a ninth flue gas outlet 82 , wherein the ninth flue gas inlet 81 is the air inlet of the induced draft fan 8 , and the ninth flue gas outlet 82 is the air outlet of the induced draft fan 8 . Specifically, the ninth flue gas inlet 81 of the induced draft fan 8 communicates with the gas outlet 72 of the dust collector 7 , and the ninth flue gas outlet 82 of the induced draft fan 8 communicates with the seventh flue gas inlet 911 of the precooler 9 .

It can be understood that the induced draft fan 8 can increase the flow velocity of the flue gas, thereby increasing the flue gas treatment efficiency in the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the waste power plant according to the embodiment of the present application.

In some embodiments, the low-temperature desulfurization and denitrification system for flue gas from the rotary kiln combustion furnace of the garbage power plant in the embodiment of the present application further includes a chimney, the chimney and the fifth flue gas outlet 52 or the eighth flue gas outlet 922 for discharging flue gas. Specifically, the chimney communicates with the fifth flue gas outlet 52 of the low-temperature adsorption tower 5, so that the flue gas discharged from the low-temperature adsorption tower 5 is discharged through the chimney. Alternatively, the chimney communicates with the eighth flue gas outlet 922 of the precooler 9, so that the flue gas discharged from the precooler 9 is discharged through the chimney.

In some embodiments, the waste heat boiler 2 includes a flue gas pipeline, the flue gas pipeline includes a first flue gas inlet 21 and a first flue gas outlet 22 , and the flue gas pipeline is used for heating the waste heat boiler 2 . Specifically, the high-temperature flue gas discharged from the rotary kiln combustion furnace 1 enters the flue gas pipe from the first flue gas inlet 21 of the flue gas pipe, and the high-temperature flue gas exchanges heat with the waste heat boiler 2 in the flue gas pipe, thereby reducing the temperature of the high-temperature flue gas. air temperature.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear" ", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", " The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, rather than indicating or implying that the referred device or element must Having a particular orientation, being constructed and operating in a particular orientation, and therefore not to be construed as limiting the application.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In this application, terms such as "installation", "connection", "connection" and "fixation" should be interpreted in a broad sense, for example, it can be a fixed connection or a detachable connection, unless otherwise clearly specified and limited. , or integrated; can be mechanically connected, can also be electrically connected or can communicate with each other; can be directly connected, can also be indirectly connected through an intermediary, can be the internal communication of two components or the interaction relationship between two components, Unless expressly defined otherwise. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

In the present application, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may mean that the first and second features are in direct contact, or that the first and second features are indirect through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on 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 higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In this application, the terms "one embodiment," "some embodiments," "example," "specific examples," or "some examples" mean specific features, structures, materials, or features described in connection with the embodiment or examples. Features are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations on the present application, and those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (9)

1. A low-temperature desulfurization and denitrification system for flue gas from a rotary kiln combustion furnace in a waste power plant, characterized in that it includes:

   A rotary kiln combustion furnace, the rotary kiln combustion furnace includes a flue gas discharge port;

   A waste heat boiler, the waste heat boiler includes a first flue gas inlet and a first flue gas outlet, and the flue gas discharge port communicates with the first flue gas inlet so as to pass flue gas into the waste heat boiler so that The flue gas heats the waste heat boiler, thereby reducing the temperature of the flue gas;

   An absorption refrigerating unit, the absorption refrigerating unit includes a steam generator and an evaporator, the steam generator includes a second flue gas inlet and a second flue gas outlet, and the evaporator includes a third flue gas inlet and a third a flue gas outlet, the first flue gas outlet communicates with the second flue gas inlet, so as to pass the flue gas into the steam generator, thereby reducing the temperature of the flue gas;

   A desulfurization tower, the desulfurization tower is provided with slaked lime for desulfurization, the desulfurization tower includes a fourth flue gas inlet and a fourth flue gas outlet, and the second flue gas outlet communicates with the fourth flue gas inlet, so that passing the flue gas into the desulfurization tower to desulfurize the flue gas,

   The fourth flue gas outlet communicates with the third flue gas inlet, so as to pass the flue gas into the evaporator, thereby reducing the temperature of the flue gas;

   A low-temperature adsorption tower, the low-temperature adsorption tower includes a fifth flue gas inlet and a fifth flue gas outlet, and the third flue gas outlet communicates with the fifth flue gas inlet so that the flue gas can be passed into the low-temperature In the adsorption tower, the flue gas is desulfurized and denitrified.
2. The low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the garbage power plant according to claim 1 is characterized in that it also includes a cooling tower, the cooling tower includes a sixth flue gas inlet and a sixth flue gas outlet, and the sixth The flue gas inlet communicates with the second flue gas inlet, so that the flue gas is passed into the cooling tower, thereby reducing the temperature of the flue gas,

   The sixth flue gas outlet communicates with the fourth flue gas inlet, so that the second flue gas outlet communicates with the fourth flue gas inlet.
3. According to claim 1 or 2, the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the garbage power plant is characterized in that it also includes a dust collector, and the dust collector includes an air inlet and an air outlet, and the air inlet is connected to the air outlet. The fourth flue gas outlet is communicated so that the flue gas is passed into the dust collector,

   The gas outlet communicates with the third flue gas inlet, so that the fourth flue gas outlet communicates with the third flue gas inlet.
4. According to claim 3, the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the garbage power plant is characterized in that it also includes a precooler, and the precooler includes a seventh flue gas inlet and a seventh flue gas outlet. The seventh flue gas inlet communicates with the gas outlet, so as to pass the flue gas into the precooler, thereby reducing the temperature of the flue gas;

   The seventh flue gas outlet communicates with the third flue gas inlet, so that the gas outlet communicates with the third flue gas inlet.
5. The low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the garbage power plant according to claim 4, wherein the precooler includes a first heat exchange assembly and a second heat exchange assembly, and the first heat exchange assembly includes The seventh flue gas inlet and the seventh flue gas outlet, the second heat exchange component can be fed with low-temperature fluid, and the seventh flue gas inlet communicates with the gas outlet so as to pass the flue gas into the first heat exchange component, thereby reducing the temperature of the flue gas.
6. The low-temperature desulfurization and denitrification system for flue gas from a rotary kiln combustion furnace in a garbage power plant according to claim 5, wherein the second heat exchange component has an eighth flue gas inlet and an eighth flue gas outlet, and the eighth flue gas The inlet communicates with the fifth flue gas outlet, so that the flue gas passes into the second heat exchange component, so that the flue gas forms the low-temperature fluid.
7. According to claim 5, the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the garbage power plant is characterized in that it also includes an induced draft fan, and the induced draft fan is arranged between the precooler and the dust collector. The air inlet of the induced fan communicates with the air outlet, and the air outlet of the induced fan communicates with the seventh flue gas inlet, so that the seventh flue gas inlet communicates with the air outlet.
8. The low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the garbage power plant according to claim 6, further comprising a chimney, and the chimney communicates with the fifth flue gas outlet or the eighth flue gas outlet, so that Exhaust the fumes.
9. According to any one of claims 1-8, the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the garbage power plant is characterized in that the waste heat boiler includes a flue gas pipeline, and the flue gas pipeline includes the first flue gas gas inlet and the first flue gas outlet, and the flue gas pipeline is used to heat the waste heat boiler.

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