A system and method for deep removal of flue gas desulfurization and fine particulate matter

Abstract

The present invention discloses a system and method for deep removal of fine particles in flue gas desulfurization, comprising a desulfurization section arranged at the bottom of an absorption tower and a fine particle removal section at the top, a desulfurization spray layer is arranged at the top of the desulfurization section to remove SO2 in the flue gas, a desulfurization slurry pool at the bottom receives the falling spray liquid, and a desulfurization circulation pump at one side of the desulfurization slurry pool provides spray desulfurization slurry for the desulfurization spray layer, thereby removing SO2 toxic gas from the flue gas; the fine particle removal section comprises an agglomeration liquid holding layer, an agglomeration spray layer, a rotating flue gas baffle, a spiral separator and a cleaning water spray layer, thereby removing fine particles below the micron level and condensable particles in the desulfurized flue gas, improving the dust removal effect, and effectively solving the emission problem of fine particles and aerosols in the tail flue gas of existing coal-fired power plants.

Description

Technical Field

[0001] The present invention relates to the field of electric power environmental protection, and in particular to a system and method for deep removal of flue gas desulfurization and fine particulate matter. Background Art

[0002] In the power industry, the dust emitted by the units is mainly removed by a combination of ESP electrostatic precipitator and WESP wet electrostatic precipitator. The comprehensive dust removal efficiency can reach more than 99%, and the dust concentration emitted is less than 10mg / m 3 The following has a significant removal effect on most particulate matter. With the increasing environmental protection requirements, the pollutants discharged by power plants contain a small amount of aerosols and sulfuric acid droplets. After the flue gas environmental protection facilities were put into operation, some thermal power plants had opaque smoke plumes or blue / yellow-brown colored smoke plumes, causing visual pollution.

[0003] Since the SCR catalyst in the existing environmental protection facilities will cause part of SO2 to be converted into SO3, SO3 reacts with water to generate sulfuric acid and generates sulfuric acid droplets when the flue gas temperature is lower than the acid dew point. The sulfuric acid droplets themselves or the droplets after absorbing the surrounding moisture increase the content of the aerosol. When the proportion of submicron particles grown in the flue gas aerosol is high, Mie scattering will occur, and the scattering effect on light will be enhanced. At this time, thick opaque white smoke plumes can be seen; when there are fewer submicron particles in the aerosol, and it is mainly composed of high-content, smaller nano-particles, the particles are much smaller than the wavelength of visible light, and Rayleigh scattering will occur. Although the smoke plume is not transparent at this time, it has a strong scattering effect on blue light. After the light passes through the smoke plume, it appears yellow-brown, while blue can be observed from other angles, so a relatively obvious transparent smoke plume can also be observed.

[0004] Although the existing electrostatic precipitator, low-temperature electrostatic precipitator, wet desulfurization and wet electrostatic precipitator equipment have a certain removal effect on this aerosol / acid mist, its emission concentration is still 10mg / m 3 Its toxicity is more than ten times that of SO2 gas, and it is also an important component of air pollution and haze. In addition, most fine particulate matter can be removed after passing through environmental protection equipment, but there is still no effective means to remove fine particulate matter with a particle size below 1 micron and condensable particulate matter, which is the next direction for deep removal of pollutants in coal-fired power plants today. The environmental protection industry pays more and more attention to ultrafine particulate aerosols. Therefore, it is of great significance to develop a system and method for deep removal of fine particulate matter by flue gas desulfurization. Summary of the invention

[0005] In view of the problem that there is still no effective removal means for fine particulate matter and condensable particulate matter with a particle size below the micron level in the prior art, the present invention provides a system and method for deep removal of fine particulate matter by coordinating flue gas desulfurization.

[0006] The present invention is achieved through the following technical solutions:

[0007] A system for flue gas desulfurization and fine particle deep removal, comprising an absorption tower, a desulfurization section arranged at the bottom of the absorption tower and a fine particle removal section at the top; the fine particle removal section comprises an agglomeration liquid holding layer, an agglomeration spray layer, a rotating flue gas baffle, a spiral separator and a cleaning water spray layer arranged in sequence from bottom to top; the agglomeration liquid holding layer comprises a liquid holding groove and a liquid guiding groove, and the liquid holding grooves are arranged at intervals to form a flue gas flow channel; the liquid guiding grooves are arranged inverted above the flue gas flow channel, and the side walls extend into adjacent liquid holding grooves; all liquid holding grooves are interconnected; the agglomeration spray layer comprises a plurality of corona charging nozzles; and the water inlet of the agglomeration spray layer is connected to the drain outlet of the agglomeration liquid holding layer through a liquid heat exchange circulation system; the spray range of the cleaning water spray layer covers the top outlet of the spiral separator; the rotating flue gas baffle is used to guide the flue gas into the spiral separator and collect the cleaning water after cleaning the spiral separator.

[0008] Preferably, the desulfurization section includes a desulfurization slurry pool and a desulfurization spray layer; the bottom of one side of the desulfurization slurry pool is connected to the oxidation fan, and the other side is connected to the input end of the desulfurization circulation pump, and the output end of the desulfurization circulation pump is connected to the input end of the desulfurization spray layer; the desulfurization slurry pool is arranged below the inlet flue of the absorption tower, and the desulfurization spray layer is arranged above the inlet flue of the absorption tower.

[0009] Preferably, the liquid heat exchange circulation system includes an agglomeration circulation pump and a heat exchanger, the water inlet of the agglomeration circulation pump is connected to the drain outlet of the agglomeration liquid holding layer, the water outlet of the agglomeration circulation pump is connected to the water inlet of the heat exchanger, and the output end of the heat exchanger is connected to the agglomeration spray layer.

[0010] Preferably, the rotating flue gas baffle includes a coaxially arranged diverter liquid guide plate and a water collecting trough; the diverter liquid guide plate is arranged in a conical shape, and a plurality of air inlet holes are arranged on the plate surface, and sealing baffles that are slidably sealed with the bottom of the spiral separator are vertically arranged around the air inlet holes; the water collecting trough is arranged in a ring shape, and the outer side is arranged on the inner wall of the absorption tower, and the inner upper end is slidably sealed and connected to the outer edge of the bottom of the diverter liquid guide plate.

[0011] Preferably, the middle rotating shaft of the flow-dividing and liquid-guiding plate is coaxially arranged at the bottom of the spiral separator.

[0012] Preferably, the water collection tank is provided with a cleaning water outlet, and is connected to the water inlet of the liquid heat exchange circulation system.

[0013] Preferably, the spiral separator comprises a plurality of spiral separation channels connected in parallel between the upper and lower end plates in the form of thin pipes, the cross-sectional area of ​​a single spiral separation channel is not greater than .m, and the spiral diameter is not greater than .m.

[0014] A method for deep removal of fine particles in coordination with flue gas desulfurization comprises the following steps: raw flue gas enters the desulfurization section through an inlet flue, a desulfurization spray cycle is performed in the front section of the flue gas process, SO in the raw flue gas is removed to form desulfurized flue gas; when the desulfurized flue gas reaches the fine particle removal section, the agglomeration liquid holding layer forcibly filters the fine particles in the flue gas, and at the same time, the agglomeration liquid holding layer collects the sprayed liquid in the fine particle removal section and passes it into a liquid heat exchange circulation system; the agglomeration spray layer sprays low-temperature charged agglomeration water mist to perform corona discharge on the desulfurized flue gas, and the fine particles in the desulfurized flue gas agglomerate and increase under the action of the low-temperature charged agglomeration water mist, and enter the spiral separation channel of the spiral separator through the top rotating flue gas baffle; in the spiral separation channel, the agglomerated fine particles are driven by centrifugal force to adhere to the wall surface of the spiral separation channel and are removed, and the generated clean flue gas passes through the centrifugal channel and is discharged from the top of the tower;

[0015] The cleaning water spray layer washes away the fine particles adhering to the wall of the spiral separation channel, and collects them in the rotating flue gas baffle and then discharges them.

[0016] Preferably, the agglomeration spray layer contains a mixture of one or more of polyacrylamide PAM, glucomannan KGM, polyaluminium chloride PAC, sodium carboxymethyl cellulose CMC and xanthan gum XTG, wherein the concentration of the agglomerating agent is less than 0.025%.

[0017] Preferably, the rotating smoke baffle rotates periodically, the air inlet holes guide the smoke into the spiral separator, the diversion and liquid guide plate collects the flushing water and guides it into the water collecting tank, and then passes it into the liquid heat exchange circulation system.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects:

[0019] The present invention discloses a system for deep removal of flue gas desulfurization and fine particulate matter, comprising a desulfurization section arranged at the bottom of an absorption tower and a fine particle removal section at the top, a desulfurization spray layer is arranged at the top of the desulfurization section to remove SO2 in the flue gas, a desulfurization slurry pool at the bottom receives the falling spray liquid, and a desulfurization circulation pump at one side of the desulfurization slurry pool provides spray desulfurization slurry for the desulfurization spray layer, thereby removing SO2 toxic gas from the flue gas; the fine particle removal section comprises an agglomeration liquid holding layer, an agglomeration spray layer, a rotating flue gas baffle, a spiral separator and a cleaning water spray layer, thereby removing fine particulate matter below the micron level and condensable particulate matter in the desulfurized flue gas.

[0020] Furthermore, the agglomeration liquid retention layer is used to separate the desulfurization section at the bottom and the fine particle removal section at the top. Only gas can pass through the agglomeration liquid retention layer to separate the desulfurization section and the fine particle removal section into layers. The agglomeration spray layer adopts an annular corona charging nozzle to charge the agglomeration spray, which is convenient for adsorbing fine particles contained in the gas inside the spiral separator, thereby improving the purification efficiency.

[0021] Furthermore, the liquid heat exchange circulation system returns the spray liquid collected by the agglomeration liquid holding layer to the agglomeration spray layer again, thereby realizing the recycling of the spray liquid and saving water resources.

[0022] A method for deep removal of fine particulate matter in combination with flue gas desulfurization, firstly, the original flue gas is subjected to desulfurization spraying and agglomeration liquid layer adsorption purification, then the agglomeration spray layer is subjected to corona discharge, so that the fine particulate matter agglomerates and increases under the action of low-temperature charged agglomeration water mist, and finally the droplets are driven by centrifugal force to adhere to the wall of the centrifugal channel and be removed. This method can remove finer particles in the original flue gas through multi-stage purification, improve the dust removal effect, and effectively solve the emission problem of fine particulate matter and aerosol in the tail flue gas of existing coal-fired power plants.

[0023] Furthermore, the rotating smoke damper rotates periodically to guide the smoke and collect the flushing water circulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of a flue gas desulfurization coordinated fine particulate matter deep removal system in a specific embodiment of the present invention;

[0025] Figure 2 It is a structural schematic diagram of a rotating smoke baffle in a specific embodiment of the present invention;

[0026] Figure 3 It is an exploded schematic diagram of a rotating smoke baffle in a specific embodiment of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of a rotating smoke baffle and a rotating separator in a specific embodiment of the present invention.

[0028] In the figure: inlet flue 1, desulfurization spray layer 2, agglomeration liquid holding layer 3, agglomeration spray layer 4, spiral separator 5, cleaning water spray layer 6, rotating flue gas baffle 7, heat exchanger 8, agglomeration circulation pump 9, desulfurization circulation pump 10, absorption tower 11, desulfurization slurry pool 12, oxidation fan 13, desulfurization section 14; fine particle removal section 15; diversion liquid guide plate 71; air inlet hole 72; water collecting tank 73. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0030] The present invention aims at the emission problem of fine particulate matter and aerosol in the tail flue gas of existing coal-fired power plants and provides a system and method for deep removal of fine particulate matter by flue gas desulfurization.

[0031] A system for flue gas desulfurization and fine particulate matter deep removal, such as Figure 1As shown, it includes an absorption tower 11, a desulfurization section 14 at the bottom of the absorption tower 11 and a fine particle removal section 15 at the top; wherein the fine particle removal section 15 includes an agglomeration liquid holding layer 3, an agglomeration spray layer 4, a rotating flue gas baffle 7, a spiral separator 5 and a cleaning water spray layer 6 arranged in sequence from bottom to top; and the agglomeration liquid holding layer 3 includes a liquid holding groove and a liquid guiding groove, and the liquid holding grooves are arranged at intervals to form a flue gas flow channel; the liquid guiding grooves are arranged inverted above the flue gas flow channel, and the side walls extend into the adjacent liquid holding grooves; all the liquid holding grooves are connected to each other;

[0032] The agglomeration spray layer 4 includes a plurality of corona charging nozzles, which can realize corona discharge on the fine particles contained in the desulfurized flue gas, so that the fine particles are agglomerated and enlarged under the action of low-temperature charged agglomeration water mist; and the water inlet of the agglomeration spray layer 4 is connected to the drain outlet of the agglomeration liquid holding layer 3 through a liquid heat exchange circulation system, and the liquid heat exchange circulation system returns the spray liquid collected by the agglomeration liquid holding layer to the agglomeration spray layer 4 again, wherein the water outlet of the spiral separator 5 is also connected to the water inlet of the agglomeration circulation pump 9, so as to realize the recycling of the spray liquid and save water.

[0033] The spiral separator 5 includes a plurality of parallel-connected spiral separation channels, such as Figure 4 As shown, the spiral separator 5 is provided with an upper end plate at the top and a lower end plate at the bottom. The two ports of the spiral separation channel are respectively provided through the upper and lower end plates, and the upper and lower end plates are respectively fixed and sealed on the side walls of the absorption tower 11 to prevent the desulfurized flue gas from escaping; the arrangement of the spiral separation channel includes but is not limited to covering the top of the entire lower end plate; the cross-sectional area of ​​a single spiral separation channel is not greater than 0.5m 2 , the spiral circle diameter is not greater than 1.5m; a rotating smoke baffle 7 is provided at the bottom of the spiral separator 5; when the low-temperature smoke enters the spiral separator 5 from the air inlet hole 72 on the rotating smoke baffle 7, the fine particles condensed under the action of centrifugal force adhere to the wall surface of the spiral separation channel 5. The cleaning water spray layer 6 is set close to the top of the spiral separator 5, and the nozzles of the cleaning water spray layer 6 are respectively set corresponding to the outlet of the spiral separation channel, and the non-working spiral separation channel is cleaned. The upper end of the spiral separation channel of the diverter and guide plate 71 on the rotating smoke baffle 7 is sprayed with cleaning water to clean the fine particles on the wall surface of the spiral separation channel 5.

[0034] The rotating flue gas baffle 7 includes a coaxially arranged diverter liquid guide plate 71 and a water collecting trough 73; wherein the diverter liquid guide plate 71 is arranged in a conical shape, so as to facilitate the diversion of the flushing water at the bottom of the spiral separator 5, and a plurality of air inlet holes 72 are arranged on the plate surface, and sealing baffles are vertically arranged around the air inlet holes 72 to slide and seal with the bottom of the spiral separator 5; wherein the water collecting trough 73 is arranged in an annular shape, and the outer side is arranged on the inner wall of the absorption tower 11, and the inner upper end is slidingly and sealingly connected with the outer edge of the bottom of the diverter liquid guide plate 71 to ensure that the flushing water collected by the diverter liquid guide plate 72 can all be collected and flowed into the water collecting trough 73; the water collecting trough 73 is provided with a cleaning water outlet, and is connected to the water inlet of the liquid heat exchange circulation system; the diverter liquid guide plate 71 diverts the cleaning water to the water collecting trough 73, and the cleaning water flows to the liquid heat exchange circulation system through the cleaning water outlet; and the middle rotating shaft of the diverter liquid guide plate 71 is coaxially arranged at the bottom of the spiral separator 5.

[0035] The desulfurization section 14 includes a desulfurization slurry pool 12 and a desulfurization spray layer 2; one side of the bottom of the desulfurization slurry pool 12 is connected to an oxidation fan 13, and the other side of the bottom is connected to the input end of the desulfurization circulation pump 10, and the output end of the desulfurization circulation pump 10 is connected to the desulfurization spray layer 2; the side wall between the desulfurization slurry pool 12 and the desulfurization spray layer 2 is connected to the inlet flue 1, and the original flue gas enters the absorption tower 11 from the inlet flue 1.

[0036] The liquid heat exchange circulation system includes an agglomeration circulation pump 9 and a heat exchanger 8, and the water outlet of the agglomeration circulation pump 9 is connected to the water inlet of the heat exchanger 8, and the output end of the heat exchanger 8 is connected to the agglomeration spray layer 4; wherein the heat exchanger 8 is a liquid-liquid heat exchanger, and specifically can be a shell and tube heat exchanger, a sleeve heat exchanger, a plate heat exchanger, etc.; the heat exchanger 8 cools the liquid with a higher temperature collected in the agglomeration liquid holding layer 3, so that the agglomeration spray layer 4 sprays a spray liquid with a lower temperature, and at the same time creates a lower temperature working environment for a number of corona charging nozzles.

[0037] A flue gas desulfurization and fine particulate matter deep removal method comprises the following steps:

[0038] The original flue gas enters the absorption tower 11 through the inlet flue 1, and a desulfurization spray cycle is performed in the front section of the flue gas process to remove SO2 in the original flue gas to form desulfurized flue gas;

[0039] The desulfurized flue gas reaches the fine particle removal section 15, enters the liquid guide groove through the flue gas flow channel of the desulfurized liquid holding layer 3, and flows to the liquid holding grooves on both sides, so that the desulfurized liquid holding layer 3 can forcibly filter the fine particles in the flue gas. At the same time, the desulfurized liquid holding layer 3 carries and collects the sprayed liquid in the fine particle removal section 15, collects it through the connecting pipes between the liquid holding grooves, and introduces it into the liquid heat exchange circulation system;

[0040] The agglomeration spray layer 4 sprays low-temperature charged agglomeration water mist to perform corona discharge on the desulfurized flue gas. The fine particles in the desulfurized flue gas agglomerate and grow under the action of the low-temperature charged agglomeration water mist. After the desulfurized flue gas passes through the top rotating flue gas baffle 7, it enters the spiral separation channel of the top spiral separator 5;

[0041] The fine particles after the aggregation are removed by the centrifugal force from the droplets adhering to the wall of the spiral separation channel. The cleaning water spray layer 6 washes the fine particles adhering to the wall of the centrifugal channel to the rotating flue gas baffle 7. The fine particles are guided by the diverter plate 71 of the rotating flue gas baffle 7 and then discharged into the water collection tank 73. The clean flue gas passes through the centrifugal channel and is discharged from the top of the tower.

[0042] Among them, a small amount of agglomerating agent can be added to the agglomeration spray layer 4, and the agglomerating agent contains a mixture of one or more of polyacrylamide PAM, glucomannan KGM, polyaluminium chloride PAC, sodium carboxymethyl cellulose CMC, and xanthan gum XTG, wherein the concentration of the agglomerating agent is less than 0.025%. The agglomerating agent can change the properties of the surface of the particles, increase the viscosity of the surface of the particles, and make the fine particles easily adhere to the inner wall of the spiral separation channel.

[0043] Among them, the rotating flue gas baffle 7 rotates periodically, and the desulfurized flue gas enters the spiral separator 5 from the air inlet hole 72 on the windward side to remove fine particles. The fine particles are removed by the action of the agglomerating agent and corona discharge and adhere to the inner wall of the spiral separation channel for exhausting smoke; the cleaning water spray layer 6 opens the nozzle corresponding to the spiral separation channel to spray and clean the inner wall of the spiral separation channel blocked by the rotating flue gas baffle 7, bringing out the fine particles adsorbed on the inner wall, and after cleaning, they follow the diversion guide plate 71 to the water collecting tank 73 and enter the liquid heat exchange circulation system; so that the spiral separation channel can operate periodically and alternately.

Claims

1. A system for flue gas desulfurization and fine particulate matter deep removal, characterized in that: It comprises an absorption tower (11), and a desulfurization section (14) arranged at the bottom of the absorption tower (11) and a fine particle removal section (15) at the top; The fine particle removal section (15) comprises, from bottom to top, an agglomeration liquid holding layer (3), an agglomeration spray layer (4), a rotating flue gas baffle (7), a spiral separator (5) and a cleaning water spray layer (6); The agglomerated liquid holding layer (3) comprises a liquid holding groove and a liquid conducting groove, wherein the liquid holding grooves are arranged at intervals to form a flue gas flow channel; the liquid conducting grooves are arranged inverted above the flue gas flow channel, and the side walls extend into adjacent liquid holding grooves; and all the liquid holding grooves are interconnected; The agglomeration spray layer (4) comprises a plurality of corona charging nozzles; and the water inlet of the agglomeration spray layer (4) is connected to the drain outlet of the agglomeration liquid holding layer (3) through a liquid heat exchange circulation system; The spraying range of the cleaning water spray layer (6) covers the top outlet of the spiral separator (5); The rotating smoke baffle (7) is used to guide the smoke into the spiral separator (5) and collect the washing water after washing the spiral separator (5); The rotating smoke baffle (7) comprises a flow distribution and liquid guiding plate (71) and a water collecting trough (73) which are coaxially arranged; The flow dividing and liquid guiding plate (71) is arranged in a conical shape, and a plurality of air inlet holes (72) are arranged on the plate surface. Sealing baffles are vertically arranged around the air inlet holes (72) and are slidably sealed with the bottom of the spiral separator (5); The water collecting tank (73) is arranged in an annular shape, with the outer side arranged on the inner wall of the absorption tower (11), and the inner upper end is slidably and sealingly connected to the outer edge of the bottom of the flow dividing and liquid guiding plate (71); The middle rotating shaft of the flow dividing and liquid guiding plate (71) is coaxially arranged at the bottom of the spiral separator (5); The water collecting tank (73) is provided with a cleaning water outlet and is connected to a water inlet of a liquid heat exchange circulation system; The spiral separator (5) comprises a plurality of sets of spiral separation channels connected in parallel between upper and lower end plates and arranged in the form of thin pipes, wherein the cross-sectional area of ​​a single spiral separation channel is not greater than 0.5 m 2 , the spiral circle diameter is not greater than 1.5m.

2. A system for flue gas desulfurization and fine particulate matter deep removal according to claim 1, characterized in that: The desulfurization section (14) comprises a desulfurization slurry pool (12) and a desulfurization spray layer (2); The bottom of one side of the desulfurization slurry pool (12) is connected to an oxidation fan (13), and the other side is connected to the input end of a desulfurization circulation pump (10), and the output end of the desulfurization circulation pump (10) is connected to the input end of a desulfurization spray layer (2); The desulfurization slurry pool (12) is arranged below the inlet flue (1) of the absorption tower (11), and the desulfurization spray layer (2) is arranged above the inlet flue (1) of the absorption tower (11).

3. According to claim 1, a system for flue gas desulfurization and fine particulate matter deep removal is characterized in that: The liquid heat exchange circulation system comprises an agglomeration circulation pump (9) and a heat exchanger (8); the water inlet of the agglomeration circulation pump (9) is connected to the drain outlet of the agglomeration liquid holding layer (3); the water outlet of the agglomeration circulation pump (9) is connected to the water inlet of the heat exchanger (8); and the output end of the heat exchanger (8) is connected to the agglomeration spray layer (4).

4. A method for deep removal of flue gas desulfurization and fine particulate matter, characterized in that: A system for deep removal of flue gas desulfurization and fine particulate matter based on any one of claims 1 to 3 comprises the following steps: The raw flue gas enters the desulfurization section (14) through the inlet flue (1), and a desulfurization spray cycle is performed in the front section of the flue gas process to remove SO2 in the raw flue gas to form desulfurized flue gas; When the desulfurized flue gas reaches the fine particle removal section (15), the agglomeration and liquid retention layer (3) forcibly filters the fine particles in the flue gas. At the same time, the agglomeration and liquid retention layer (3) collects the sprayed liquid in the fine particle removal section (15) and passes it into the liquid heat exchange circulation system; The agglomeration spray layer (4) sprays low-temperature charged agglomeration water mist to perform corona discharge on the desulfurized flue gas, and fine particles in the desulfurized flue gas agglomerate and grow under the action of the low-temperature charged agglomeration water mist, and enter the spiral separation channel of the spiral separator (5) through the top rotating flue gas baffle (7); The agglomerated fine particles are removed from the spiral separation channel by the centrifugal force, and the resulting clean flue gas passes through the centrifugal channel and is discharged from the top of the tower. The cleaning water spray layer (6) washes away the fine particles adhering to the wall surface of the spiral separation channel, and collects them in the rotating smoke baffle (7) and then discharges them; The rotating smoke baffle (7) rotates periodically, the air inlet holes (72) guide the smoke into the spiral separator (5), and the flow diversion and liquid guide plate (71) collects the flushing water and guides it into the water collecting tank (73) and passes it into the liquid heat exchange circulation system.

5. A method for deep removal of flue gas desulfurization and fine particulate matter according to claim 4, characterized in that: The agglomeration spray layer (4) contains a mixture of one or more of polyacrylamide PAM, glucomannan KGM, polyaluminium chloride PAC, sodium carboxymethyl cellulose CMC and xanthan gum XTG, wherein the concentration of the agglomeration agent is less than 0.025%.

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