CN212819051U - Double-circulation type ultra-low smoke discharge device - Google Patents
Double-circulation type ultra-low smoke discharge device Download PDFInfo
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- CN212819051U CN212819051U CN202021262810.1U CN202021262810U CN212819051U CN 212819051 U CN212819051 U CN 212819051U CN 202021262810 U CN202021262810 U CN 202021262810U CN 212819051 U CN212819051 U CN 212819051U
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Abstract
A double-circulation type flue gas ultra-low emission device relates to the technical field of limestone-gypsum wet flue gas desulfurization. The utility model discloses a two-stage reaction tower, second grade reaction tower lower part are connected to concentrated swirler entry through gypsum escape pump two, and concentrated swirler top export is connected with one-level reaction tower thick liquid pond one, and concentrated swirler bottom export divides two tunnel: one path is connected with the first-stage reaction tower slurry pool, and the other path is connected with the second-stage reaction tower slurry pool. The first stage reaction tower smoke outlet is connected to the second stage reaction tower smoke inlet through a communicating flue, and the lower part of the first stage reaction tower is connected to a gypsum cyclone through a gypsum discharge pump. And the first oxidation fan is connected with the first oxidation air pipe in the primary reaction tower slurry tank, and the second oxidation fan is connected with the second oxidation air pipe in the secondary reaction tower slurry tank. The utility model provides a former flue gas gets into the second grade tower and desulfurates once more after the one-level tower desulfurization, can effectively improve desulfurization flue gas system resistance, reduces the thick liquid total amount, improves desulfurization efficiency, reduces the working costs.
Description
Technical Field
The utility model relates to a limestone-gypsum wet flue gas desulfurization technical field, especially be applicable to the high-efficient desulfurization of high-sulfur coal and the ultralow discharging equipment of dual cycle formula flue gas that removes dust in coordination.
Background
The main atmospheric pollutants generated after the combustion of fossil fuels are sulfur dioxide (SO)2) Nitrogen oxides (NOx), smoke (inhalable particles) and carbon dioxide as a greenhouse gas. In particular to the cause of coal emission, SO of China2The contamination is already very serious. In recent years, with the enhancement of social environmental awareness, the environmental requirements are increased in order to reduce SO in flue gas of power plants2The total amount and concentration of the discharged gas are regulated by the national environmental protection administration, and policies, plans, standards and the like are provided. Industries and enterprises are also in the midst of implementation and implementation. In the concrete implementation of coal desulfurization, it is difficult to realize the high-efficiency removal of high-sulfur coal.
In the prior art, the method mainly focuses on a single-tower single-cycle desulfurization process operation mode, and is difficult to effectively solve the ultralow emission problem of high-sulfur coal. The process of configuring large slurry amount and multiple spray layers is generally adopted, so that the problems of high lift and large energy consumption of a circulating pump are caused, and the problems of short circuit of flue gas in a tower, uneven flow field and the like also occur.
Disclosure of Invention
In order to solve the defects existing in the prior art, the utility model aims to provide a double-circulation type flue gas ultralow emission device. The original flue gas is desulfurized in the first-stage tower and then enters the second-stage tower for secondary desulfurization, so that the system resistance of the desulfurized flue gas can be effectively improved, the total amount of slurry is reduced, the desulfurization efficiency is improved, and the operating cost is reduced.
In order to achieve the above object, the technical solution of the present invention is implemented as follows:
a dual-circulation type ultralow-emission device for flue gas comprises two stages of reaction towers, wherein a slurry pool, a flue gas inlet, a spraying layer, a demister and a flue gas outlet are respectively arranged in each stage of reaction tower from bottom to top. Liquid in the thick liquid pump suction thick liquid pond is sent to and is sprayed the layer, and side feed formula agitator extends into in the thick liquid pond, and the oxidation tuber pipe in arranging two-stage reaction tower thick liquid pond in is connected respectively to the oxidation fan, the middle part of two-stage reaction tower all is equipped with the flue gas import, and the top of reaction tower is equipped with the exhanst gas outlet. The structure is characterized by also comprising a concentration cyclone. The second grade reaction tower lower part is connected to concentrated swirler entry through gypsum discharge pump two, and concentrated swirler top export is connected with first-order reaction tower thick liquid pond, and concentrated swirler bottom export divides two tunnel: one path is connected with the first-stage reaction tower slurry pool, and the other path is connected with the second-stage reaction tower slurry pool. The first stage reaction tower smoke outlet is connected to the second stage reaction tower smoke inlet through a communicating flue, and the lower part of the first stage reaction tower is connected to a gypsum cyclone through a gypsum discharge pump. And the first oxidation fan is connected with the first oxidation air pipe in the primary reaction tower slurry tank, and the second oxidation fan is connected with the second oxidation air pipe in the secondary reaction tower slurry tank.
In the double-circulation type ultra-low smoke emission device, the communicated flue is Z-shaped and is made of carbon steel lined with glass flakes; a flue gas online monitoring device is arranged on the communicated flue to perform online monitoring on the flue gas pollutants; the distance from the lower edge of the flue gas inlet of the reaction tower to the liquid level of the bottom slurry pool is not less than 1.5 m; the spraying layer is positioned 2 meters above the upper edge of the flue gas inlet; the number of the side-feeding type stirrers at each stage is more than or equal to 3; two gypsum discharge pumps are arranged in each stage of reaction tower.
In the above double circulation type ultra-low emission device for flue gas, in the first-stage reaction tower: controlling the pH value of the first slurry pool to be 4.2-5.5; the first oxidation air pipe adopts a pipe network type; the spraying layer I consists of three layers or four layers, the distance between every two layers is 2 meters, and the materials are FRP glass fiber reinforced plastics and silicon carbide; the first demister is of a two-stage ridge type, the lower part of the first demister is spaced from the spraying layer by 2 meters, and the upper part of the first demister is spaced from the lower edge of the flue gas outlet by 1 meter; four slurry pumps are adopted for the first step.
In the above-mentioned double circulation type flue gas ultra-low emission device, in the second-stage reaction tower: controlling the pH value of the slurry pool II to be 5.5-6.5; the second oxidation air pipe adopts a pipe network type or a spear type; the second spraying layer consists of three layers, the distance between every two layers is 2 meters, and the materials are FRP glass fiber reinforced plastics and silicon carbide; the second demister is of a three-stage ridge type, the distance between the lower part of the second demister and the distance between the second demister and the spraying layer is 3 meters, and the distance between the upper part of the second demister and the lower edge of the second flue gas outlet is 2 meters; and the second slurry pump adopts three pumps.
In the above-mentioned double circulation type ultra-low emission device for flue gas, the outlet at the bottom of the concentration cyclone is divided into two paths: one path is connected to the first slurry pool through the first switch valve, and the other path is connected to the second slurry pool through the second switch valve.
The utility model discloses owing to adopted above-mentioned structure, former flue gas gets into the one-level reaction tower earlier, after preliminary desulfurization, goes out the one-level reaction tower, gets into the intercommunication flue, then gets into the second grade reaction tower and carries out high-efficient desulfurization, goes out the second grade reaction tower, advances clean flue, is discharged by the chimney. The utility model discloses in, one-level reaction tower, second grade reaction tower adopt different pH value operation, and pH value control is at 4.2~5.5 in the one-level reaction tower to the dissolving rate of lime stone powder is faster, does benefit to the crystallization of gypsum granule, can obtain the gypsum of higher quality. And the pH value in the secondary tower is controlled to be 5.5-6.5 so as to obtain better desulfurization effect and higher desulfurization efficiency. Compared with the prior art, the utility model has the characteristics of energy-conservation, efficient, can realize the ultralow emission.
The present invention will be further described with reference to the accompanying drawings and the following detailed description.
Drawings
Fig. 1 is a schematic structural view of the dual-cycle ultra-low smoke emission device of the present invention.
Detailed Description
Referring to fig. 1, the present invention discloses a dual cycle ultra-low emission device for flue gas, which comprises a two-stage reaction tower and a concentration cyclone 22. A slurry pool, a flue gas inlet, a spraying layer, a demister and a flue gas outlet are respectively arranged in each stage of reaction tower from bottom to top. Liquid in the slurry pump pumping slurry pool is sent to the spraying layer, the side-entry stirrer extends into the slurry pool, the first oxidation fan 21 and the second oxidation fan 26 are respectively connected with the oxidation air pipes arranged in the slurry pools of the two-stage reaction tower, the middle parts of the two-stage reaction tower are respectively provided with a flue gas inlet, and the top of the reaction tower is provided with a flue gas outlet. The lower part of the second-stage reaction tower 2 is connected to the inlet of a concentration cyclone 22 through a gypsum pump II 20, and the outlet at the top of the concentration cyclone 22 is connected with the first slurry pool 3 of the first-stage reaction tower 1. The outlet at the bottom of the concentration cyclone 22 is divided into two paths: one path is connected with a first slurry pool 3 of the first-stage reaction tower 1 through a first switch valve 23, and the other path is connected with a second slurry pool 4 of the second-stage reaction tower 2 through a second switch valve 24. The first flue gas outlet 15 of the first-stage reaction tower 1 is connected to the second flue gas inlet 14 of the second-stage reaction tower 2 through a Z-shaped communicating flue 25, and the communicating flue 25 is made of carbon steel lined with glass flakes; a flue gas online monitoring device is arranged on the communicating flue 25 to perform online monitoring on the flue gas pollutants; the lower part of the primary reaction tower 1 is connected to a gypsum cyclone through a gypsum pump I19. The distance from the lower edge of the flue gas inlet of the reaction tower to the liquid level of the bottom slurry pool is not less than 1.5 m; the spraying layer is positioned 2 meters above the upper edge of the flue gas inlet; the number of the side-feeding type stirrers at each stage is more than or equal to 3; two gypsum pumps are used for each stage.
In the first-stage reaction tower 1: the PH value of the first slurry pool 3 is controlled to be 4.2-5.5; the oxidation air pipe I5 adopts a pipe network type; the first spraying layer 11 consists of three layers or four layers, the distance between every two layers is 2 meters, and the materials are FRP (fiber reinforced Plastic) and silicon carbide; the first demister 9 is of a two-stage ridge type, the lower part of the first demister 9 is spaced from the first spraying layer 11 by 2 meters, and the upper part of the first demister 9 is spaced from the first flue gas outlet 15 by 1 meter; four slurry pumps are adopted in the first slurry pump 17.
In the second-stage reaction tower 2: the pH value of the slurry pool II 4 is controlled to be 5.5-6.5; the second oxidation air pipe 6 is in a pipe network type or spear type; the second spraying layer 12 consists of three layers, the distance between each layer is 2 meters, and the materials are FRP glass fiber reinforced plastics and silicon carbide; the second demister 10 is of a three-stage ridge type, the distance between the lower part of the second demister 10 and the second spraying layer 12 is 3 meters, and the distance between the upper part of the second demister 10 and the lower edge of the second flue gas outlet 16 is 2 meters; the second slurry pump 18 adopts three pumps.
The utility model discloses the during operation, when one-level reaction tower 1 and 2 liquid level inequalities of second grade reaction tower, oxidation fan one 21, oxidation fan two 26 dispose according to the tower respectively. The utility model discloses in, 1 desulfurization efficiency design scope 85% ~ 92% of one-level reaction tower, 2 desulfurization efficiency design scopes of second grade reaction tower 87% ~ 97%, the general 97 ~ 99.8% of whole desulfurization efficiency design scope of two tower double circulation systems.
The utility model discloses before the one-level reaction tower, behind intercommunication flue, the second grade reaction tower, all can dispose CEMS flue gas on-line monitoring device to carry out necessary tracking control to desulfurization system's operation, and provide the data support of operation scheme.
Claims (5)
1. The utility model provides an ultralow discharging equipment of dual cycle formula flue gas, it includes two-stage reaction tower, from supreme thick liquid pond, flue gas entry of having put respectively down in every stage of reaction tower, spray layer, defroster and exhanst gas outlet, liquid in the thick liquid pump suction thick liquid pond is sent to spraying the layer, and side entry agitator extends into in the thick liquid pond, and the oxidation air duct in two-stage reaction tower thick liquid pond is arranged in to the oxidation fan is connected respectively, the middle part of two-stage reaction tower all is equipped with the flue gas inlet, and the top of reaction tower is equipped with exhanst gas outlet, and its characterized in that, two (20) are connected to concentrated swirler (22) entry through gypsum escape pump two in second grade reaction tower (2) lower part, and concentrated swirler (22) top export is connected with one-level reaction tower (1) thick liquid pond (3: one way is connected with one-level reaction tower (1) thick liquid pond (3), and another way is connected with second grade reaction tower (2) thick liquid pond two (4), one-level reaction tower (1) exhanst gas outlet (15) are connected to second grade reaction tower (2) flue gas import two (14) through intercommunication flue (25), and one-level reaction tower (1) lower part is connected to the gypsum swirler through gypsum discharge pump one (19), and oxidation air pipe one (5) in one-level reaction tower (1) thick liquid pond is connected in oxidation fan one (21), and oxidation air pipe two (6) in second grade reaction tower (2) thick liquid pond are connected in oxidation fan two (26).
2. The double-circulation type ultra-low smoke emission device according to claim 1, wherein the communicating flue (25) is Z-shaped and is made of carbon steel lined with glass flakes; a flue gas online monitoring device is arranged on the communicating flue (25) to perform online monitoring on the flue gas pollutants; the distance from the lower edge of the flue gas inlet of the reaction tower to the liquid level of the bottom slurry pool is not less than 1.5 m; the spraying layer is positioned 2 meters above the upper edge of the flue gas inlet; the number of the side-feeding type stirrers at each stage is more than or equal to 3; two gypsum discharge pumps are arranged in each stage of reaction tower.
3. The double circulation type flue gas ultra-low emission device according to claim 1 or 2, wherein: the PH value of the first slurry pool (3) is controlled to be 4.2-5.5; the oxidation air pipe I (5) adopts a pipe network type; the first spraying layer (11) consists of three layers or four layers, and the distance between every two layers is 2 meters; the first demister (9) is of a two-stage ridge type, the distance between the lower part of the first demister (9) and the first spraying layer (11) is 2 meters, and the distance between the upper part of the first demister (9) and the lower edge of the first flue gas outlet (15) is 1 meter; four slurry pumps are adopted in the first slurry pump (17).
4. The double circulation type ultra-low emission device for flue gas according to claim 3, wherein the secondary reaction tower (2) comprises: controlling the pH value of the slurry pool II (4) to be 5.5-6.5; the second oxidation air pipe (6) adopts a pipe network type or a spear type; the second spraying layer (12) consists of three layers, and the distance between each layer is 2 meters; the second demister (10) is of a three-stage ridge type, the distance between the lower part of the second demister (10) and the second spraying layer (12) is 3 meters, and the distance between the upper part of the second demister (10) and the lower edge of the second flue gas outlet (16) is 2 meters; the second slurry pump (18) adopts three pumps.
5. The double circulation type ultra-low smoke emission device of claim 4, wherein the outlet at the bottom of the concentration cyclone (22) comprises two paths: one path is connected to the first slurry pool (3) through a first switch valve (23), and the other path is connected to the second slurry pool (4) through a second switch valve (24).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021262810.1U CN212819051U (en) | 2020-07-02 | 2020-07-02 | Double-circulation type ultra-low smoke discharge device |
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| CN202021262810.1U CN212819051U (en) | 2020-07-02 | 2020-07-02 | Double-circulation type ultra-low smoke discharge device |
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