CN202387342U - Wet-type electric dedusting device - Google Patents

Abstract

The utility model discloses a wet type electric dust removal device, which comprises a wet type absorption tower, a smoke guide pipe, a wet type electric dust collector and a smoke exhaust pipe, a smoke inlet is arranged on the wet type absorption tower, the front end of the smoke guide pipe is connected to At the upper end of the tower, the rear end of the smoke guide pipe is connected to the upper end of the wet electrostatic precipitator, the front end of the smoke exhaust pipe is connected to the lower end of the wet electrostatic precipitator, and the rear end of the smoke exhaust pipe is connected to the chimney. The wet electrostatic precipitator is installed vertically , the flue gas enters the exhaust pipe through the wet electrostatic precipitator from top to bottom. The wet electrostatic precipitator of the utility model is arranged under the rear end of the smoke guide pipe, so that the flue gas flows downward, and the flushing liquid on the anode plate flows downward, and the direction is consistent with the flow direction of the flue gas, which is convenient for the anode plate to collect fine particles in the flue gas And aerosol, realize the efficient removal of compound pollutants in flue gas, reduce environmental pollution, and meet the continuously improving air emission standards.

Description

A wet electrostatic precipitator

technical field

The utility model relates to the technical field of environmental protection, in particular to a wet electric dust removal device.

Background technique

With the continuous improvement of people's awareness of the harm to the environment and health of composite pollutants such as fine dust, acid mist, and heavy metals, the emission standards of air pollutants have been continuously improved. The new emission standards require pollutants such as fine particles, acid mist, and heavy metals The emission level is lower, and the traditional flue gas absorption device has a good control effect on some pollutants in the flue gas, but composite pollutants such as fine dust, heavy metals, and SO ₃ acid mist are still the focus of attention and need to be resolved urgently problem.

After the flue gas is washed by the absorption tower, the unabsorbed fine dust, SO ₃ acid mist and other compound pollutants not only cause secondary pollution, but more importantly, cause serious harm to people's health. Downstream of the chimney wind direction, the so-called "gypsum rain" or "blue smoke" with long tails can often be seen. With the continuous development of industry, the harm caused by atmospheric compound pollutants to the environment is becoming more and more serious. The existing technology for removing compound pollutants in flue gas still cannot achieve the desired effect. Therefore, it is very necessary to explore a new, Efficient removal of complex pollutants such as fine dust, SO ₃ acid mist and other technologies to reduce environmental pollution.

As a terminal fine treatment equipment for atmospheric composite pollutants, wet electrostatic precipitators can be used to control the discharge of acid mist, fine dust, mercury, metals and other substances. As early as 1907, wet electrostatic precipitator (WESP) technology has been applied to remove acid mist plume. With the continuous development of technology, WESP has been continuously extended to many industrial fields. Tests in coal-fired power plants have shown that WESP can remove more than 90% of fine dust and SO ₃ smoke, and can achieve near-zero turbidity emissions. In addition, WESP technology can also be used to remove mercury and absorb part of SO ₂ and HCl. As a flue gas terminal fine treatment equipment, WESP has attracted more and more attention because of its characteristics of small pressure drop, simple operation, low energy consumption, no moving parts, low maintenance cost, high dust removal performance and reliability.

Utility model content

The problem to be solved by the utility model is to provide a wet electrostatic precipitator, which has a simple structure and is easy to use, and at the same time efficiently removes aerosols formed by fine particles and SO ₃ , etc., reduces equipment blockage and chimney corrosion, and can solve "chimney rain" , "gypsum rain", "blue smoke" and other technical problems, to meet environmental protection requirements.

In order to solve the above technical problems, the utility model adopts the following technical solutions: a wet electrostatic precipitator, characterized in that it includes a wet absorption tower, a smoke guide pipe, a wet electrostatic precipitator and a smoke exhaust pipe, and the wet absorption tower is equipped with The flue gas inlet, the front end of the smoke guide pipe is connected to the upper end of the wet absorption tower, the rear end of the smoke guide pipe is connected to the upper end of the wet electrostatic precipitator, the front end of the smoke exhaust pipe is connected to the lower end of the wet electrostatic precipitator, and the rear end of the smoke exhaust pipe is Connected with the chimney, the wet electrostatic precipitator is installed vertically, and the flue gas enters the exhaust pipe through the wet electrostatic precipitator from top to bottom.

Further, the wet absorption tower includes a tower body and a first sprayer arranged in the upper part of the tower body in a horizontal direction, the upper end of the tower body is connected to the front end of the smoke guide pipe, and a spray liquid pool is provided at the lower part of the tower body, and the flue gas The inlet is located on the tower body between the first sprayer and the spray liquid tank, and a circulation pump is provided outside the tower body, and the circulation pump is respectively connected to the spray liquid pool and the first sprayer through connecting pipes so as to The spray liquid is delivered from the spray liquid tank to the first shower. Realize the recycling of spray liquid and save resources.

Further, a fan is provided on the outside of the tower, and one end of the air supply pipe is connected to the fan, and the air supply pipe extends into the spray liquid pool, and the other end of the air supply pipe is positioned at the joint between the connecting pipe and the spray liquid pool . The air is sent into the spray liquid pool through the air supply pipe to oxidize the spray liquid.

Further, a stirrer is provided in the spray liquid pool. Make the blown air evenly distributed in the spray liquid and prevent the settlement of solid-containing materials.

Further, a deflector is provided in the smoke guiding duct. Make the flue gas evenly flow into the wet electrostatic precipitator.

Further, the wet electrostatic precipitator includes a housing, a second shower, at least two anode plates and at least one set of cathode frames, the upper end of the housing is connected to the rear end of the smoke guide pipe, and the anode plates are vertically fixed in parallel on the In the casing, at least one set of cathode frames are vertically arranged between two anode plates, and a plurality of cathode wires are arranged in the cathode frames, and the cathode wires are electrically connected to the external power supply through wires, and the second shower is fixed on the casing horizontally The upper part is located above the anode plate and the cathode frame, and a water pump is arranged outside the casing and connected to the second shower through the first water pipe.

Further, the upper end of the housing is provided with an anode plate hanger and a cathode hanger, the anode plate hanger is located above the cathode hanger, the upper end of the anode plate is fixed on the anode plate hanger, and the upper end of the cathode frame is fixed on the cathode hanger, The lower end of the casing is provided with an anode plate support frame, and the lower end of the anode plate is fixed on the anode plate support frame, and the distance between two adjacent anode plates is 300-450 mm.

Further, the first half of the smoke exhaust pipe is a U-shaped section, the front end of the U-shaped section is connected to the lower end of the housing, the rear end of the U-shaped section is connected to the second half of the smoke exhaust pipe, and the inside of the front end of the U-shaped section There is at least one layer of porous distribution plate in the horizontal direction, the opening ratio of the porous distribution plate is greater than 30%, and the lower part of the U-shaped section is provided with a liquid collector, and the liquid collector is connected with a guide pipe connected to the spray liquid pool. The U-shaped section is set to facilitate the liquid collector to collect the pollutant liquid collected on the surface of the anode plate.

Further, the U-shaped section is provided with a louver grill corresponding to the liquid collector, and the louver grill is arranged obliquely upward along the smoke flow direction and the angle between the louver grill and the smoke flow direction is 30°-65°. Reduce liquid entrainment and break up air bubbles.

Further, the second half of the smoke exhaust pipe is a flat section, the front end of the flat section is provided with a corrugated demister, and a third sprayer is vertically provided in front of the corrugated demister, and the third sprayer passes through the first Two water pipes are connected with the water pump. The flat section is higher than the U-shaped section, so that the pollutant liquid collected on the surface of the anode plate will not flow into the corrugated demister, ensuring the long-term normal use of the third sprayer and the corrugated demister.

After adopting the above technical scheme, the utility model has the following advantages: the wet electrostatic precipitator is arranged under the rear end of the smoke guide pipe, so that the flue gas flows downward, and the flushing liquid on the anode plate flows downward, and the direction is consistent with the flue gas flow direction. It is convenient for the anode plate to collect fine particles and aerosols in the flue gas, realize the efficient removal of compound pollutants in the flue gas, reduce environmental pollution, and meet the continuously improving air emission standards.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described:

Fig. 1 is a schematic structural view of an embodiment of the utility model.

Detailed ways

As shown in Figure 1, a structural schematic diagram of an embodiment of the utility model, a wet electrostatic precipitator, including a wet absorption tower 1, a smoke guide pipe 2, a wet electrostatic precipitator 3 and a smoke exhaust pipe 4, on the wet absorption tower There is a flue gas inlet 10, the front end of the smoke guide pipe is connected to the upper end of the wet absorption tower, the rear end of the smoke guide pipe is connected to the upper end of the wet electrostatic precipitator, the front end of the smoke exhaust pipe is connected to the lower end of the wet electrostatic precipitator, and the smoke exhaust pipe The rear end is connected with the chimney 9, the wet electrostatic precipitator is installed vertically, and the flue gas enters the smoke exhaust pipe through the wet electrostatic precipitator from top to bottom.

In the above embodiment, the wet absorption tower includes a tower body 11 and a first sprayer 12 arranged horizontally on the upper part of the tower body. 13. The flue gas inlet is located on the tower body at a position between the first sprayer and the spray liquid pool, and a circulating pump 14 is provided outside the tower body, and the circulating pump is respectively connected to the spray liquid pool, the spray liquid pool, and the spray liquid pool through connecting pipes 15. The first shower is connected to deliver spray liquid from the spray liquid tank to the first shower. There is usually no mist eliminator in the wet absorption tower, and if necessary, 1-2 flat plate or roof type mist eliminators can also be installed. Here, the front end of the smoke guide duct can also be directly integrated with the upper end of the tower body.

On the basis of the above structure, a further improvement is made. A fan 16 is arranged on the outside of the tower body. One end of the air supply pipe 17 is connected to the fan. The air supply pipe extends into the spray liquid pool, and the other end of the air supply pipe is positioned between the connecting pipe and The connection of the spray tank. It is also possible to arrange an agitator 18 in the spray liquid tank.

On the basis of the structure of the above-mentioned embodiments, a deflector 21 is arranged in the smoke guide pipe, so that the smoke enters the wet electrostatic precipitator evenly from the smoke guide pipe, and the structure and shape of the guide plate are determined by numerical simulation and physical model calculation. The installation location, the material requires corrosion resistance and wear resistance.

In the above embodiment, the wet electrostatic precipitator includes a housing 31, a second shower 32, at least two anode plates 33 and at least one cathode frame 34, and the number of anode plates and cathode frames is according to the number of the wet electrostatic precipitator Determined by the size, five anode plates and four cathode frames are set in this embodiment. The upper end of the casing is connected to the rear end of the smoke guide pipe, the anode plates are vertically fixed in parallel in the casing, a cathode line is vertically arranged between two anode plates, the cathode line is electrically connected to the external power supply 35 through a wire, and the second The shower is fixed horizontally on the upper part of the casing and is located above the anode plate and the cathode frame. A water pump 5 is arranged outside the casing and is connected to the second shower through a first water pipe 36 . Specifically, the upper end of the housing is provided with an anode plate hanger 37 and a cathode hanger 38, the anode plate hanger is located above the cathode hanger, the upper end of the anode plate is fixed on the anode plate hanger, and the upper end of the cathode frame is fixed on the cathode hanger The lower end of the housing is provided with an anode plate support frame 39, and the lower end of the anode plate is fixed on the anode plate support frame. The distance between two adjacent anode plates is 300-450mm, generally preferably 300mm, 350mm, 400mm or 450mm. The height of the anode plate can be determined according to site conditions and design needs, and the general height range is 4-8m; the cathode line is preferably a square tube with needles, which has a lower corona inception voltage and can generate strong corona. The second sprayer continuously sprays to the anode plate, and the flushing liquid on the anode plate flows downwards in the same direction as the flue gas flow, forming a uniform liquid film on the front and back surfaces of the anode plate to maintain the conductivity of the surface of the anode plate. It is beneficial for the charged particles to move to the surface of the anode, improving the dust collection efficiency. The internal environmental conditions of the wet electrostatic precipitator are harsh, so the materials of its internal structure should be anti-corrosion materials to prevent the flushing liquid from corroding the structure. The anode plate is usually made of stainless steel or glass fiber (FRP) with surface conductivity, and the cathode wire is used Made of stainless steel material. In this embodiment, the wet electrostatic precipitator is set as a single stage, and the removal efficiency of fine particles and aerosols is 90-99%. It is also possible to set two or three stages... to set two or three stages of wet electric precipitators The removal efficiency of fine particles and aerosols is 99-99.99%, so generally no more than three levels will be set.

The first half of the smoke exhaust pipe is a U-shaped section 41, the front end of the U-shaped section is connected to the lower end of the housing, the rear end of the U-shaped section is connected to the second half of the smoke exhaust pipe, and the front end of the U-shaped section is flat to the inside. At least one layer of porous distribution plate 42 is provided. The opening ratio of the porous distribution plate is greater than 30%. To prevent clogging, corrosion-resistant materials must be used to ensure the stability of the air flow field in the wet electrostatic precipitator; the lower part of the U-shaped section A liquid collector 43 is provided, and a guide pipe 44 is connected to the liquid collector to be connected to the spray liquid pool. The pollutant liquid collected on the surface of the anode plate contains insoluble solid substances, which are easy to deposit and block, and have strong acid and alkali corrosiveness. The liquid collector is to collect and wash off the pollutants containing insoluble solid substances on the anode plate The liquid is collected and flowed back to the spray liquid pool of the wet absorption tower to form a liquid seal. The guide pipe should have a certain downward slope to facilitate the flow of pollutant liquid into the spray liquid pool and prevent blockage.

In addition, a louver grille 45 is provided in the U-shaped section corresponding to the liquid collector, and the louver grille is arranged obliquely upward along the direction of the smoke flow, and the angle between the louver grille and the flow direction of the smoke flow is 30-65°, preferably 30°, 45° ° or 60°. Specifically, the louver grille is set at a relatively horizontal position in the U-shaped section, which can reduce the effect of liquid foam entrainment and broken air bubbles. Corrosion-resistant materials should be used, usually polypropylene (PP), polyvinyl chloride (PVC) ), FRP, etc. The second half of the smoke exhaust pipe is a flat section 46, the front end of the flat section is provided with a corrugated demister 47, and the front of the corrugated demister is vertically provided with a third sprayer 48, and the third sprayer passes through the second water pipe 49 is connected with water pump. The corrugated demister is cleaned by the third sprayer intermittently to ensure that the surface of the demister is clean and the interior is not blocked.

In the above embodiment, the flue gas enters the wet absorption tower through the flue gas inlet, and the spray liquid is transported to the first sprayer through the circulation pump, and the target components in the flue gas are washed after being atomized by the first sprayer Absorption, the washed low-temperature flue gas enters the wet electrostatic precipitator evenly through the smoke guide pipe, removes fine particles and aerosols in the flue gas after electrostatic precipitation, and finally gets purified after demisting through the smoke exhaust pipe, and passes through the chimney 9 into the atmosphere. The utility model realizes the high-efficiency removal of compound pollutants in the smoke, reduces environmental pollution, and satisfies the continuously increasing air emission standards.

In addition to the above-mentioned preferred embodiment, the utility model also has other implementation modes, those skilled in the art can make various changes and deformations according to the utility model, as long as they do not depart from the spirit of the utility model, all should belong to the appended rights of the utility model The scope defined by the requirement.

Claims (10)

1. wet-esp device; It is characterized in that: comprise wet-type absorption tower (1), fire tube flue (2), wet electrical dust precipitator (3) and smoke discharging pipe (4); On wet-type absorption tower, be provided with smoke inlet (10), the front end of fire tube flue is connected the wet-type absorption tower upper end, and the rear end of fire tube flue is connected the wet electrical dust precipitator upper end; The front end of smoke discharging pipe is connected the lower end of wet electrical dust precipitator; The rear end of smoke discharging pipe is communicated with chimney (9), and said wet electrical dust precipitator vertically is provided with, and flue gas gets into smoke discharging pipe through wet electrical dust precipitator from the top down.

2. a kind of wet-esp device according to claim 1; It is characterized in that: said wet-type absorption tower comprises that tower body (11) peace is to first spray thrower (12) that is located at the tower body internal upper part; The tower body upper end is connected with the front end of fire tube flue; The tower body bottom is provided with spray liquid pool (13); Said smoke inlet is located on the tower body position between first spray thrower and spray liquid pool, is provided with circulating pump (14) in the tower body outside, circulating pump through tube connector (15) thus be connected with spray liquid pool, first spray thrower respectively spray liquid be delivered to first spray thrower from spraying liquid pool.

3. a kind of wet-esp device according to claim 2; It is characterized in that: the said tower body outside is provided with blower fan (16); Be connected to an end of ajutage (17) on the blower fan, ajutage stretches into the spray liquid pool, and the other end of ajutage is positioned at tube connector and the junction that sprays liquid pool.

4. according to claim 2 or 3 described a kind of wet-esp devices, it is characterized in that: be provided with agitator (18) in the said spray liquid pool.

5. a kind of wet-esp device according to claim 1 and 2 is characterized in that: be provided with deflector (21) in the said fire tube flue.

6. a kind of wet-esp device according to claim 1; It is characterized in that: said wet electrical dust precipitator comprises housing (31), second spray thrower (32), at least two positive plates (33) and at least one group of cathode frame (34); The housing upper end is connected with the rear end of fire tube flue; The vertical secured in parallel of positive plate is in housing; At least one group of cathode frame vertically is set between the positive plate in twos, is provided with many cathode line in the cathode frame, cathode line is electrically connected with external power source (35) through lead; Second spray thrower is flat to being fixed on housing top and being positioned at positive plate and the cathode frame top, and outside is provided with water pump (5) and is connected with second spray thrower through first water pipe (36).

7. a kind of wet-esp device according to claim 6; It is characterized in that: said housing upper end is provided with positive plate hanger (37) and negative electrode hanger (38), and the positive plate hanger is positioned at negative electrode hanger top, and the positive plate upper end is fixed on the positive plate hanger; The cathode frame upper end is fixed on the negative electrode hanger; The housing lower end is provided with positive plate bracing frame (39), and the positive plate lower end is fixed on the positive plate bracing frame, and the distance between the close in twos positive plate is 300～450mm.

8. a kind of wet-esp device according to claim 1; It is characterized in that: preceding half section of said smoke discharging pipe is U-shaped section (41), and the front end of U-shaped section is connected with the lower end of housing, and the rear end of U-shaped section was connected with the second half section of smoke discharging pipe; The front end inner flat of U-shaped section is to being provided with one deck multihole distributor (42) at least; The percent opening of multihole distributor is greater than 30%, and the bottom of U-shaped section is provided with liquid trap (43), is connected to mozzle (44) on the liquid trap and is connected in the spray liquid pool.

9. a kind of wet-esp device according to claim 8 is characterized in that: said U-shaped Duan Zhongyu liquid trap corresponding position is provided with blinds grid (45), the blinds grid along flue gas flow direction be inclined upwardly be provided with and and flue gas flow direction between angle be 30～65 °.

10. according to claim 1 or 8 described a kind of wet-esp devices; It is characterized in that: the second half section of said smoke discharging pipe is for putting down to section (46); Flat front end to section is provided with ripple demister (47); The place ahead of ripple demister vertically is provided with the 3rd spray thrower (48), and the 3rd spray thrower is connected with water pump through second water pipe (49).

Images