CN210356474U

CN210356474U - Wet flue gas desulfurization tail gas whitening system

Info

Publication number: CN210356474U
Application number: CN201921200718.XU
Authority: CN
Inventors: 许俊
Original assignee: Tongxing Environmental Protection Technology Co ltd
Current assignee: Tongxing Environmental Protection Technology Co ltd
Priority date: 2019-07-26
Filing date: 2019-07-26
Publication date: 2020-04-21
Anticipated expiration: 2029-07-26

Abstract

The utility model discloses a wet flue gas desulfurization tail gas whitening system, including booster fan, heat pipe exchanger, wet flue gas desulfurization tower and baffle valves, booster fan installs on the flue gas advances the pipeline, the flue gas advances pipe connection waste heat recovery boiler and wet flue gas desulfurization tower, the wet flue gas desulfurization tower leads to water piping connection circulating water tank, the circulating water tank passes through water piping connection circulating water pump, the circulating water pump leads to the pipe carries water to being located the inside spray assembly of wet flue gas desulfurization tower, folded plate defroster and silk screen defroster are installed from bottom to top in proper order to the upper end of wet flue gas desulfurization tower, the play mouth of cigarette of wet flue gas desulfurization tower passes through flue gas outlet pipe and connects in the chimney, flue gas outlet pipe connects on clean flue gas is imported and exported, flue gas advances to say and goes out through connecting tube. The utility model discloses can guarantee the normal work of desulfurizing tower, reduce water consumption, improve the desulfurization efficiency of desulfurizing tower simultaneously, reduce atmospheric secondary pollution, realize the saturated steam in the desorption flue gas, reach the environmental protection and discharge the requirement.

Description

Wet flue gas desulfurization tail gas whitening system

Technical Field

The utility model relates to an environmental protection technology field specifically is a wet flue gas desulfurization tail gas takes off white system.

Background

At present, most of the smoke of domestic coal-fired power plants or other chemical industries is subjected to wet desulphurization before being discharged, the existing wet desulphurization process mainly comprises a limestone-gypsum method, a double alkali method, a magnesium oxide method and an ammonia method, a part of built wet desulphurization devices mostly adopt the limestone-gypsum method, the temperature is reduced to 45-55 ℃ before being discharged, the smoke at the moment is usually saturated wet smoke, the smoke contains a large amount of water vapor, and the water vapor contains more soluble salts, SO3, gel dust, micro dust and the like (all being main components of haze). If the flue gas is directly discharged from the chimney and enters the ambient air with lower temperature, because the saturation humidity of the ambient air is lower, the water vapor in the flue gas can be condensed to form wet smoke plume in the process of reducing the temperature of the flue gas. Causing not only visual but substantial contamination of the atmosphere.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a wet flue gas desulfurization tail gas whitening system, utilize the wet clean flue gas after the high temperature flue gas of non-desulfurization passes through heat pipe exchanger and goes to the heating desulfurization, make clean flue gas heated the dew point temperature who promotes the flue gas, utilize heat pipe exchanger both can retrieve the heat of high temperature flue gas, the energy can be saved, can guarantee the normal work of desulfurizing tower again, reduce water consumption, improve the desulfurization efficiency of desulfurizing tower simultaneously, reduce atmospheric secondary pollution, realize the saturated steam in the desorption flue gas, reach the environmental protection and discharge the requirement, can solve the problem among the prior art.

In order to achieve the above object, the utility model provides a following technical scheme:

a wet desulphurization tail gas whitening system, which comprises a booster fan, a heat pipe exchanger, a wet desulphurization tower and a baffle valve group, the booster fan is arranged on a flue gas inlet pipeline, the flue gas inlet pipeline is connected with a waste heat recovery boiler and a wet desulphurization tower, the flue gas inlet pipeline is connected with a hot flue gas inlet and a hot flue gas outlet of a heat pipe exchanger, the wet desulphurization tower is connected with a circulating water tank through a water pipe, the circulating water tank is connected with a circulating water pump through a water pipe, the circulating water pump conveys water to a spraying assembly positioned in the wet desulphurization tower through a water pipe, a folded plate demister and a wire mesh demister are sequentially arranged at the upper end of the wet desulphurization tower from bottom to top, the outlet flue of the wet desulphurization tower is connected to the chimney through a flue gas outlet pipeline, the flue gas outlet pipeline is connected to the clean flue gas inlet and outlet, and the flue gas inlet pipeline is connected with the flue gas outlet pipeline through a connecting pipeline.

Furthermore, the interior of the heat pipe heat exchanger is divided into a shell pass and a tube pass, and a heat dissipation fin positioned on the inner wall of the shell pass is arranged outside the tube pass.

Furthermore, the spraying assembly is arranged into three layers and consists of a spraying pipe network and a nozzle with a downward nozzle.

Furthermore, the upward washing water system of nozzle is equipped with to the below of folded plate defroster, and the downward washing water system of nozzle is equipped with to the top of silk screen defroster, and two washing water systems all lead to pipe connection on circulating water pump.

Furthermore, the baffle valve group comprises a baffle valve A, a baffle valve B and a baffle valve C, wherein the baffle valve A is installed on the flue gas inlet pipeline, the baffle valve B is installed on the flue gas outlet pipeline, and the baffle valve C is installed on the connecting pipeline.

Furthermore, the folded plate demister is made of PP, and the wire mesh demister is made of 316L or PP.

Compared with the prior art, the beneficial effects of the utility model are as follows:

this wet flue gas desulfurization tail gas whitening system, the wet clean flue gas after utilizing the high temperature flue gas of not desulfurization to go to heat the desulfurization through heat pipe exchanger, make clean flue gas heated to the dew point temperature who promotes the flue gas from 50 ℃, utilize heat pipe exchanger both can retrieve the heat of high temperature flue gas, the energy can be saved, can guarantee the normal work of desulfurizing tower again, reduce water consumption, improve the desulfurization efficiency of desulfurizing tower simultaneously, reduce atmospheric secondary pollution, realize the saturated steam in the desorption flue gas, reach the environmental protection and discharge the requirement.

Drawings

FIG. 1 is a process flow diagram of the present invention;

fig. 2 is a cross-sectional view of the heat pipe heat exchanger of the present invention.

In the figure: 1. a booster fan; 2. a heat pipe heat exchanger; 21. shell pass; 22. a tube pass; 23. a heat dissipating fin; 3. a water circulating pump; 4. a circulating water tank; 5. a wet desulfurization tower; 6. a spray assembly; 7. a folded plate demister; 8. a wire mesh demister; 9. a baffle valve group; 91. a flapper valve A; 92. a flapper valve B; 93. a flapper valve C; 10. connecting a pipeline; 11. the flue gas enters a pipeline; 12. a water pipe; 13. and (4) discharging the flue gas out of the pipeline.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, a wet desulfurization tail gas whitening system comprises a booster fan 1, a heat pipe exchanger 2, a wet desulfurization tower 5 and a baffle valve group 9, wherein the booster fan 1 is installed on a flue gas inlet pipeline 11, the booster fan 1 boosts the temperature of high-temperature flue gas (about 160-Desulfurizing tower 5, through wet flue gas desulfurizing tower 5 spray dust and the acidic material in the flue gas of getting rid of, simultaneously flue gas cooling (being less than 50 ℃), wet saturated flue gas aqueous vapor condenses into the liquid drop, and the formation of greatly reduced steam can also, wet flue gas desulfurizing tower 5 leads to pipe 12 and connects circulating water tank 4, the water that sprays in wet flue gas desulfurizing tower 5 can collect circulating water tank 4 to the absorption tower bottom through gravity, circulating water tank 4 cools off spraying the absorption liquid, SO that absorb the flue gas heat once more, circulating water tank 4 leads to pipe 12 and connects circulating water pump 3, circulating water pump 3 leads to pipe 12 and carries water to the spray assembly 6 that is located wet flue gas desulfurizing tower 5 inside, spray assembly 6 sets up into the three-layer, spray assembly 6 comprises spray pipe network and the decurrent nozzle of spout, both can absorb the SO in the former flue gas₂And the temperature of the flue gas can be reduced, so that water vapor in high-temperature flue gas is condensed into liquid drops, a folded plate demister 7 and a screen demister 8 are sequentially installed at the upper end of the wet desulphurization tower 5 from bottom to top, condensed water in the cooled flue gas is removed, the folded plate demister 7 is used for removing liquid drops of large particles carried in the flue gas, primary demisting is carried out on the mist drops carried in the flue gas, the material is PP, the screen demister 8 is a secondary demister, the material is 316L or PP, the material is used for removing small particle liquid drops which cannot be removed by the folded plate demister 7, so that mist drops and particles larger than 3 microns in the flue gas are removed, and the content of the mist drops in the outlet flue gas is smaller than 10mg/³. The content of smuggleing ware of two kinds of different forms combines to control better in the flue gas and smugglies the liquid drop, the ascending wash water system of nozzle is equipped with to the below of folded plate defroster 7, the decurrent wash water system of nozzle is equipped with to the top of silk screen defroster 8, two wash water systems all connect on circulating water pump 3 through water pipe 12, remaining granule is washed off on folded plate defroster 7 or the silk screen defroster 8 to upper and lower wash water system, rivers after washing still fall into circulating water tank 4 at the bottom of wet flue gas desulfurization tower 5, the outlet flue of wet flue gas desulfurization tower 5 passes through flue gas outlet pipe 13 and connects in the chimney, flue gas outlet pipe 13 is connected on clean flue gas exit, connect through connecting tube 10 between flue gas inlet pipe 11 and the flue gas outlet pipe 13.

Referring to fig. 2, the interior of the heat pipe exchanger 2 is divided into a shell pass 21 and a tube pass 22, the raw flue gas in the heat pipe exchanger 2 exchanges heat with the clean flue gas in the tube pass 22 through the shell pass 21, the heat dissipation fins 23 located on the inner wall of the shell pass 21 are arranged outside the tube pass 22, the heat exchange efficiency is increased, the raw flue gas after heat exchange is reduced from 160-170 ℃ to 110-120 ℃, and the clean flue gas is increased from 50 ℃ to not less than 85 ℃ to reach the flue gas dew point temperature.

The baffle valve group 9 comprises a baffle valve A91, a baffle valve B92 and a baffle valve C93, wherein the baffle valve A91 is arranged on the smoke inlet pipeline 11, the baffle valve B92 is arranged on the smoke outlet pipeline 13, the baffle valve C93 is arranged on the connecting pipeline 10, when the system is in normal use, the baffle valve C93 is closed, the baffle valve A91 and the baffle valve B92 are opened, when the system is in failure, the baffle valve C93 is opened, the baffle valve A91 and the baffle valve B92 are closed, and smoke is directly discharged into the atmosphere to temporarily protect the system.

High-temperature flue gas (160-. The flue gas loops through folded plate defroster 7 and silk screen defroster 8 at the top of the tower from bottom to top at last. The demisted clean smoke is sent into the heat pipe heat exchanger 2 for heating through the smoke outlet pipeline 13, is reheated to be not less than 85 ℃ from 50 ℃ and reaches above the smoke dew point temperature, so that dew point corrosion is effectively prevented, a small amount of moisture in the clean smoke is converted into steam, the temperature of the smoke is raised to a certain temperature according to a graph that the moisture content of saturated wet air changes along with the temperature, the tail gas emission meets the condition that white feather disappears, and smoke-free emission is realized. Absorb the solution that sprays and extract from circulating water tank 4 by circulating water pump 3 that the system set up and send to and spray the layer, spray the thick liquid and flow to 5 bottoms of wet flue gas desulfurization tower automatically, there is water pipe 12 to link to each other with circulating water tank 4 wet flue gas desulfurization tower 5 bottoms, and circulating water tank 4 cools off the thick liquid, sends to through circulating water pump 3 after the cooling and sprays the layer to absorb the temperature of flue gas, SO2, fine particulate matter etc. reach the effect of cooling desulfurization.

In summary, the following steps: this wet flue gas desulfurization tail gas takes off white system, through the flue gas inlet pipe 11 send into heat pipe exchanger 2 after booster fan 1 pressure boost, carry out the heat exchange of cold and hot flue gas in heat pipe exchanger 2, high temperature flue gas temperature reduces to sending into wet flue gas desulfurization tower 5, sprays through wet flue gas desulfurization tower 5 and gets rid of dust and the acidic material in the flue gas, and the flue gas cooling simultaneously, the condensation becomes the liquid drop in the wet saturated flue gas, but also the formation of greatly reduced steam. The wet saturated flue gas is demisted by the folded plate demister 7 and the wire mesh demister 8 and then sent into the heat pipe heat exchanger 2, the heat of the original flue gas is used for heating the cooled wet saturated clean flue gas, the temperature of the clean flue gas is heated to more than 85 ℃ from 50 ℃, the temperature of the flue gas is raised to a certain temperature, the exhaust emission meets the condition that white feather disappears, and smokeless emission is realized.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a wet flue gas desulfurization tail gas takes off white system, includes booster fan (1), heat pipe exchanger (2), wet flue gas desulfurization tower (5) and baffle valves (9), its characterized in that: the device is characterized in that the booster fan (1) is installed on a flue gas inlet pipeline (11), the flue gas inlet pipeline (11) is connected with a waste heat recovery boiler and a wet desulphurization tower (5), the flue gas inlet pipeline (11) is connected with a hot flue gas inlet and outlet of a heat pipe heat exchanger (2), the wet desulphurization tower (5) is connected with a circulating water tank (4) through a water pipe (12), the circulating water tank (4) is connected with a circulating water pump (3) through the water pipe (12), the circulating water pump (3) conveys water to a spray assembly (6) positioned inside the wet desulphurization tower (5) through the water pipe (12), a folded plate demister (7) and a wire mesh demister (8) are sequentially installed at the upper end of the wet desulphurization tower (5) from bottom to top, a flue gas outlet of the wet desulphurization tower (5) is connected with a chimney through a flue gas outlet pipeline (13), and the flue gas outlet pipeline (13) is connected, the smoke inlet pipeline (11) is connected with the smoke outlet pipeline (13) through a connecting pipeline (10).

2. The system for removing white content from tail gas of wet desulphurization according to claim 1, characterized in that: the heat pipe heat exchanger (2) is internally divided into a shell pass (21) and a tube pass (22), and a radiating fin (23) positioned on the inner wall of the shell pass (21) is arranged outside the tube pass (22).

3. The system for removing white content from tail gas of wet desulphurization according to claim 1, characterized in that: the spray assembly (6) is arranged into three layers, and the spray assembly (6) consists of a spray pipe network and a nozzle with a downward nozzle.

4. The system for removing white content from tail gas of wet desulphurization according to claim 1, characterized in that: the lower part of the folded plate demister (7) is provided with a flushing water system with an upward nozzle, the upper part of the screen demister (8) is provided with a flushing water system with a downward nozzle, and the two flushing water systems are connected to the circulating water pump (3) through water pipes (12).

5. The system for removing white content from tail gas of wet desulphurization according to claim 1, characterized in that: the baffle valve group (9) comprises a baffle valve A (91), a baffle valve B (92) and a baffle valve C (93), the baffle valve A (91) is installed on the smoke inlet pipeline (11), the baffle valve B (92) is installed on the smoke outlet pipeline (13), and the baffle valve C (93) is installed on the connecting pipeline (10).

6. The system for removing white content from tail gas of wet desulphurization according to claim 1 or 4, characterized in that: the folded plate demister (7) is made of PP, and the wire mesh demister (8) is made of 316L or PP.