CN212119517U - A flue gas desulfurization and dust removal system - Google Patents

Abstract

The utility model relates to a flue gas desulfurization dust removal system, including the absorption tower, the absorption tower bottom is provided with the thick liquid collecting pit, the lower part and the upper portion of absorption tower are provided with flue gas inlet and exhanst gas outlet respectively, the inside of absorption tower has set gradually one-level spraying layer from bottom to top, the second grade sprays the layer, the third grade sprays the layer, the fourth grade sprays the layer, defroster and dust remover, the inner wall of thick liquid collecting pit is provided with the agitator, the top of agitator is provided with the breather pipe, the breather pipe communicates with the oxidation fan, the outer wall of thick liquid collecting pit is provided with upper clear liquid export and lower floor turbid liquid export, upper clear liquid export communicates with the clear liquid circulating pump, the clear liquid circulating pump communicates with fourth grade spraying layer, lower floor turbid liquid export; the multi-stage spraying is adopted to improve the desulfurization effect, reduce the content of sulfur dioxide and dust in the flue gas and ensure that the discharged gas meets the emission standard specified by environmental protection.

Description

A flue gas desulfurization and dust removal system

technical field

The utility model relates to flue gas desulfurization and dust removal processing equipment, in particular to a flue gas desulfurization and dust removal system.

Background technique

The soot, sulfur dioxide and nitrogen oxides generated in the combustion process of boilers in power plants have a great impact on the atmospheric environment. Sulfur dioxide is one of the main pollutants of air pollution. According to the Environmental Statistics Bulletin, the total industrial waste gas emission is 251.217 billion standard cubic meters. Meter. The total amount of sulfur dioxide emissions in the exhaust gas accounted for 296,100 tons, and in the total exhaust gas pollutant emissions, the proportion of pollutants from industries increased. In recent years, due to the serious pollution of soot, dust and dust, the voice of controlling the emission of air pollutants is getting louder and louder.

The equipment configuration and desulfurization effect of the current desulfurization system can no longer meet the new flue gas emission standards, and the consumption of desulfurization dose is large, resulting in high production costs, and the treatment of desulfurization equipment does not match the new flue gas emission standards formulated by the environmental protection department. This situation is not uncommon in the industry.

Utility model content

The purpose of this utility model is to provide a flue gas desulfurization and dust removal system, by which a first-level spray layer, a second-level spray layer, a third-level spray layer, a fourth-level spray layer, a first-level spray layer, a second-level spray layer, a third-level spray layer, a fourth-level spray layer, Mist eliminators and dust collectors use multi-stage spraying to improve the desulfurization effect, reduce the content of sulfur dioxide and dust in the flue gas, and achieve emission standards that meet environmental protection regulations.

The purpose of the utility model can be achieved by the following technical solutions: a flue gas desulfurization and dust removal system, including an absorption tower, a slurry collection tank is arranged at the bottom of the absorption tower, and a flue gas inlet and a flue gas outlet are respectively arranged at the lower part and the upper part of the absorption tower , the absorption tower is provided with a first-level spray layer, a second-level spray layer, a third-level spray layer, a fourth-level spray layer, a mist eliminator and a dust collector from bottom to top, and the inner wall of the slurry collection tank is provided with a stirrer The top of the mixer is provided with a vent pipe, which is communicated with the oxidizing fan. The outer wall of the slurry collection tank is provided with a supernatant liquid outlet and a lower layer turbid liquid outlet. The supernatant liquid outlet is communicated with the supernatant liquid circulation pump. The four-stage spray layer is connected, and the turbid liquid outlet of the lower layer is communicated with the turbid liquid discharge pump.

In the above technical solution, the first-level spray layer, the second-level spray layer and the third-level spray layer are all provided with one group of spray pipes, the fourth-level spray layer is provided with four groups of spray pipes, and the spray pipes are provided with several spray pipes. atomizing nozzle.

In the above technical solution, the upper and lower sides of the mist eliminator are provided with first flushing pipes, the first flushing pipes are communicated with the water outlet of the flushing water pump, and the water inlet of the flushing water pump is communicated with the clean water pool.

In the above technical solution, a cyclone separator is also included, the turbid liquid inlet of the cyclone separator is communicated with the turbid liquid discharge pump, and the clear liquid outlet of the cyclone separator is communicated with the three-stage spray layer.

In the above technical scheme, it also includes a vacuum belt filter press, a filtrate separator, a dilution water pump, a compressed air storage tank and a filtrate pool, and the feed port of the vacuum belt filter press is connected to the slag discharge port of the cyclone separator, The filtrate outlet of the vacuum belt filter press is communicated with the filtrate separator, and the filtrate outlet of the filtrate separator is communicated with the filtrate pool.

In the above technical solution, a second flushing pipe is arranged above the vacuum belt filter press, and the second flushing pipe is communicated with the clean water tank.

Compared with the prior art, the beneficial effects of the present utility model are as follows: the first-level spray layer, the second-level spray layer, the third-level spray layer, the fourth-level spray layer, and the demisting layer are sequentially arranged inside the absorption tower from bottom to top. It adopts multi-stage spraying to improve the desulfurization effect, reduce the content of sulfur dioxide and dust in the flue gas, and meet the emission standards of environmental protection regulations.

Description of drawings

The present invention will be further described by using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, under the premise of no creative work, the following drawings can also be used to obtain Additional drawings.

Figure 1 is a schematic structural diagram of a flue gas desulfurization and dust removal system of the present invention.

The symbols shown in the figure are: 1, absorption tower; 2, flue gas inlet; 3, first-level spray layer; 4, second-level spray layer; 5, third-level spray layer; 6, fourth-level spray layer ; 7, mist eliminator; 8, first flushing pipe; 9, dust collector; 10, flue gas outlet; 11, oxidation fan; 12, agitator; 13, ventilation pipe; 14, slurry collection tank; 15, turbid liquid Discharge pump; 16, clear liquid circulation pump; 17, filtrate circulation pump; 18, filtrate tank; 19, compressed air storage tank; 20, dilution water pump; 21, filtrate separator; 22, vacuum belt filter press; 23, The second flushing pipe; 24, the cyclone separator; 25, the clean water pool; 26, the flushing water pump.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

As shown in Figure 1, the structure of the present utility model is: a flue gas desulfurization and dust removal system, comprising an absorption tower 1, a slurry collection tank 14 is arranged at the bottom of the absorption tower 1, and a flue gas inlet is respectively arranged at the lower part and the upper part of the absorption tower 1 2 and the flue gas outlet 10, the absorption tower 1 is provided with a first-level spray layer 3, a second-level spray layer 4, a third-level spray layer 5, a fourth-level spray layer 6, a mist eliminator 7 and a The dust collector 9 is a wet electrostatic precipitator. The inner wall of the slurry collection tank 14 is provided with an agitator 12, and a ventilation pipe 13 is arranged above the agitator 12. The ventilation pipe 13 is communicated with the oxidation fan 11. The outer wall is provided with the supernatant liquid outlet and the lower layer turbid liquid outlet, the supernatant liquid outlet is communicated with the supernatant liquid circulation pump 16, the supernatant liquid circulation pump 16 is communicated with the four-level spray layer 6, and the lower stratum turbid liquid outlet is communicated with the turbid liquid discharge pump 15 , connect the lime water supply pipe through the secondary spray layer 4, provide lime water as a desulfurizer, atomize the lime water in the absorption tower, and the sulfur dioxide in the flue gas is absorbed by the lime water to form a mixture of calcium sulfate and calcium sulfite The slurry is settled in the slurry collection tank 14, and air is introduced into the slurry collection tank 14 at the same time, so that calcium sulfite is completely oxidized into calcium sulfate, and the supernatant in the slurry collection tank 14 is sent to the four-level spray layer 6 again. Spray, so that the unreacted calcium hydroxide in the supernatant liquid continues to absorb the sulfur dioxide in the flue gas, and the multi-stage spraying is used to improve the desulfurization effect, reduce the content of sulfur dioxide and dust in the flue gas, and further reduce the smoke through the dust collector 9. The dust content in the gas makes the discharged gas meet the emission standards of environmental protection regulations.

In this embodiment, the first-level spray layer 3, the second-level spray layer 4 and the third-level spray layer 5 are all provided with one group of spray pipes, and the fourth-level spray layer 6 is provided with four groups of spray pipes. There are several atomizing nozzles on it.

In this embodiment, the upper and lower sides of the mist eliminator 7 are provided with a first flushing pipe 8, the first flushing pipe 8 is communicated with the water outlet of the flushing water pump 26, and the water inlet of the flushing water pump 26 is communicated with the clean water tank 25, The first flushing pipe 8 regularly flushes the mist eliminator 7 to prevent the surface of the mist eliminator 7 from scaling.

In this embodiment, a cyclone separator 24 is also included, the turbid liquid inlet of the cyclone separator 24 is communicated with the turbid liquid discharge pump 15, the clear liquid outlet of the cyclone separator 24 is communicated with the third-stage spray layer 5, and the slurry is collected. The bottom turbid liquid in the pool 14 also contains some unreacted calcium hydroxide solution, which is transported to the cyclone separator 24 through the turbid liquid discharge pump 15 to separate the sediment from the clear liquid, and the separated clear liquid is transported to the third stage. The spray layer 5 is atomized and recycled, which further enhances the desulfurization effect and saves costs.

In this embodiment, it also includes a vacuum belt filter press 22, a filtrate separator 21, a dilution water pump 20, a compressed air storage tank 19 and a filtrate pool 18, and a feed port and a cyclone separator of the vacuum belt filter press 22. The slag discharge port of 24 is connected, the filtrate outlet of the vacuum belt filter press 22 is communicated with the filtrate separator 21, the filtrate outlet of the filtrate separator 21 is communicated with the filtrate pool 18, and the discharge port of the filtrate pool 18 is provided with a filtrate circulating pump 17 , the filtrate circulation pump 17 is communicated with the first-level spray layer 3, and the gypsum produced by the vacuum belt filter press 22 is transported out, and the filtrate produced by the vacuum belt filter press 22 is further filtered through the filtrate separator 21. The filtrate tank 18 is recycled after precipitation to further enhance the desulfurization effect.

In this embodiment, a second flushing pipe 23 is arranged above the vacuum belt filter press 22 , the second flushing pipe 23 is communicated with the clean water tank 25 , and the solids on the vacuum belt filter press 22 are cleaned through the second flushing pipe 23 .

The present utility model has been further described above with the help of specific embodiments, but it should be understood that the specific description here should not be construed as a limitation on the essence and scope of the present utility model. Various modifications made to the above-mentioned embodiments all belong to the protection scope of the present invention.

Claims (6)

1. The utility model provides a flue gas desulfurization dust pelletizing system which characterized in that: comprises an absorption tower (1), a slurry collecting tank (14) is arranged at the bottom of the absorption tower (1), a flue gas inlet (2) and a flue gas outlet (10) are respectively arranged at the lower part and the upper part of the absorption tower (1), a first-level spraying layer (3), a second-level spraying layer (4), a third-level spraying layer (5), a fourth-level spraying layer (6), a demister (7) and a dust remover (9) are sequentially arranged in the absorption tower (1) from bottom to top, a stirrer (12) is arranged on the inner wall of the slurry collecting tank (14), a vent pipe (13) is arranged above the stirrer (12), the vent pipe (13) is communicated with an oxidation fan (11), an upper clear liquid outlet and a lower turbid liquid outlet are arranged on the outer wall of the slurry collecting tank (14), the upper clear liquid outlet is communicated with a clear liquid circulating pump (16), the clear liquid circulating pump (16) is communicated with the fourth-level spraying layer (6, the lower layer turbid liquid outlet is communicated with a turbid liquid discharge pump (15).

2. The flue gas desulfurization and dust removal system according to claim 1, wherein: the one-level sprays layer (3), the second grade sprays layer (4) and tertiary layer (5) and all is provided with a set of shower, the level four sprays layer (6) and is provided with four groups of shower, be provided with a plurality of atomizing nozzle on the shower.

3. The flue gas desulfurization and dust removal system according to claim 1, wherein: the upper side and the lower side of the demister (7) are respectively provided with a first flushing pipe (8), the first flushing pipe (8) is communicated with a water outlet of a flushing water pump (26), and a water inlet of the flushing water pump (26) is communicated with a clean water tank (25).

4. The flue gas desulfurization dust removal system according to claim 3, characterized in that: the device is characterized by further comprising a cyclone separator (24), wherein a turbid liquid inlet of the cyclone separator (24) is communicated with a turbid liquid discharge pump (15), and a clear liquid outlet of the cyclone separator (24) is communicated with the third-stage spraying layer (5).

5. The flue gas desulfurization and dust removal system according to claim 4, wherein: still include vacuum belt filter press (22), filtrate separator (21), dilution water pump (20), compressed air storage tank (19) and filtrating pond (18), the feed inlet of vacuum belt filter press (22) is connected with the row's cinder notch of cyclone (24), the filtrating export and the filtrate separator (21) intercommunication of vacuum belt filter press (22), the filtrating export and the filtrate pond (18) intercommunication of filtrate separator (21), the leakage fluid dram of filtrate pond (18) is equipped with filtrating circulating pump (17), filtrating circulating pump (17) and one-level spray layer (3) intercommunication.

6. The flue gas desulfurization dust removal system according to claim 5, wherein: a second flushing pipe (23) is arranged above the vacuum belt type filter press (22), and the second flushing pipe (23) is communicated with a clean water tank (25).

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