CN204411992U - Passive plate rotating vane type dedusting demister - Google Patents

Abstract

The utility model relates to a passive plate-type wet dedusting and demisting device, which comprises a shell with a smoke inlet channel and a smoke outlet channel at both ends, and an atomizing nozzle, a venturi air guide channel and a mist eliminator are sequentially arranged in the shell , wherein the atomizing nozzle is adjacent to the smoke inlet channel, and the mist eliminator is connected to the smoke outlet channel; the dust removal and fog removal treatment is performed through a passive plate-type wet dust removal and fog removal device. The device of the utility model is simple in structure, low in running resistance, high in safety and reliability, fast in operation and low in cost, and can effectively remove tiny particles such as fine liquid droplets, fine dust particles, and aerosols in the flue gas. Compared with the wet electrostatic precipitator with purification effect, there are no electrical components, energy consumption is reduced, and the economic cost is greatly reduced; moreover, it is easy to install and is suitable for coal-fired, oil-fired, gas-fired power plants, metallurgy, chemical industry, solid waste (garbage) treatment and other related industries in the field of clean flue gas dust removal and fog removal.

Description

Passive plate wet dust and fog removal device

technical field

The utility model relates to the technical field of dust and mist removal in flue gas treatment, in particular to a passive plate-type wet dust and mist removal device used for existing flue gas wet treatment.

Background technique

At present, there are many flue gas dedusting technologies, among which, the relatively mature and representative technologies are: electrostatic precipitator, bag filter, electrostatic bag combined precipitator, wet electrostatic precipitator and other dust removal technologies, which are used for flue gas wet After desulfurization, the dust and mist removal devices are mainly mist eliminators and wet electrostatic precipitators. In the process, the mist eliminator removes the tiny droplets produced in the wet spraying process. The types of mist eliminators are mainly flat plate and roof type. The removal effect of droplets with a diameter of less than 5um, dust with a particle diameter of less than 5um in the flue gas, and tiny particles such as sulfate, sulfite, nitrate, and nitrite that constitute PM2.5 aerosols are difficult to achieve environmental protection Require. In addition, in the process of processing, a wet electrostatic precipitator is installed after the wet desulfurization unit for dust removal and demisting. Although it can effectively remove tiny particles, the wet electrostatic precipitator has the disadvantages of large space occupation of process equipment, high initial investment, and difficult operation. Many problems such as high energy consumption and difficulty in retrofitting existing projects

Therefore, in order to meet people's increasingly stringent requirements for environmental protection, it is urgent to improve the technology in this field.

Utility model content

The purpose of this utility model is to provide a passive plate-type wet dust and mist removal device for the problems existing in the existing flue gas treatment technology, which is optimized and integrated on the basis of the existing wet flue gas purification treatment equipment, without the need for With the addition of electrical components, the operation is simple and reliable, and it can effectively remove tiny droplets, fine dust particles, aerosols and other tiny particles in the flue gas, improve the removal and purification efficiency of the flue gas, enhance the environmental protection effect, reduce energy consumption, and reduce costs.

The technical scheme for solving the problem of the utility model is: a passive plate-type wet dedusting and demisting device, including a casing with a smoke inlet channel and a smoke outlet channel at both ends, and an atomizing nozzle, a Venturi guide, etc. An air passage and a mist eliminator, wherein the atomizing nozzle is adjacent to the smoke inlet passage, and the mist eliminator is connected to the smoke outlet passage.

Further, in the passive plate-type wet dust and mist removal device of the present invention, the demister is a vertical plate-type demister; A device for dissolving water.

Further, in the passive plate-type wet dedusting and demisting device of the present invention, the Venturi air guide channel includes a constriction section, a throat and a diffusion section connected in sequence, wherein the constriction section is connected to the atomizing nozzle Adjacent, the diffuser section is adjacent to the demister.

Preferably, in the passive plate-type wet dedusting and demisting device of the present invention, the Venturi air guiding channel is composed of multiple groups of Venturi tubes.

Preferably, in the passive plate-type wet dedusting and demisting device of the present invention, there are multiple groups of the Venturi air guiding channels, and each group of the Venturi air guiding channels is composed of a plurality of partitions and air guiding plates.

Preferably, in the passive plate-type wet dust and mist removal device of the present invention, among the plurality of air guide plates, the ratio of the distance between adjacent air guide plates to the height of the air guide plates is 1:8 to 40 :1.

Preferably, in the passive plate-type wet dedusting and demisting device of the present utility model, the distance between adjacent air guiding plates is 0.2-1 meter; the height of the air guiding plates is 0.5-8 meters; the fog The distance between the spray nozzle and the partition is 5cm-50cm; the distance between the adjacent partitions is 5cm-50cm.

Preferably, in the passive plate-type wet dedusting and demisting device of the present invention, the channel wall of the Venturi air guide channel is made of acid-resistant stainless steel, carbon steel coated with glass flake anti-corrosion layer, glass steel, PP and PVC. constitute.

The utility model also provides a passive plate-type wet dedusting and mist removal process: the flue gas processed by the existing wet flue gas purification treatment equipment enters the passive plate-type wet dust and mist removal device from the smoke inlet channel, In the plate-type wet dedusting and demisting device, the flue gas is sequentially contacted with the atomized water sprayed from the atomizing nozzle, the Venturi air guide channel is acted on, and the demister is processed, and the obtained clean flue gas is discharged through the smoke outlet channel.

Further, in the above-mentioned passive plate-type wet dedusting and demisting treatment process, in the Venturi gas guide channel, the atomized flue gas is sequentially processed through the contraction section, the throat section and the diffusion section, and then in the demisting section Trapped in the device; preferably, the particle size range of the atomized water droplets sprayed out by the atomizing nozzle is 20um-60um, so as to ensure the trapping of tiny particles.

Further, in the above-mentioned passive plate-type wet dedusting and demisting process, the flue gas passes through the passive plate-type wet dedusting and demisting device vertically or parallel to the clean flue of the original wet-process flue gas purification treatment equipment.

When the passive plate type wet dust and mist removal device of the utility model is applied, it only needs to be connected with the clean flue of the existing wet flue gas purification treatment equipment, and the fine liquid droplets and fine dust particles in the flue gas can be removed. , aerosol and other tiny particles for deep purification and removal, no need to consume as much power as wet electrostatic precipitator, passive type for deep purification of flue gas, and optimized integration of atomizing nozzles, Venturi air guide channels and mist eliminators The flue gas is wet-type dedusted and mist-removed, thereby avoiding the impact on the equipment and the environment during the flue gas treatment and discharge process; moreover, because it can be combined with the clean flue of the existing treatment system, it saves a lot of space; in addition , the existing wet flue gas purification treatment equipment used to install the utility model passive plate wet dedusting and demisting device has no special restrictions, such as limestone calcium desulfurization system, ammonia desulfurization system, double alkali desulfurization system and wet desulfurization system Denitrification systems, wet demercury systems and other wet flue gas treatment devices that combine desulfurization, denitrification and demercury can all be applied. The passive plate type wet dust removal and fog removal treatment process is carried out by using the wet flue gas treatment device combined with desulfurization, denitrification and mercury removal of the utility model. Through the full analysis and research on the composition and operation of the flue gas, the flue gas enters the The Venturi air guide channel uses the pressure of the flue gas itself as the driving force, and through the collision of the Venturi air guide channel wall, the movement direction and speed of the flue gas are changed, so that the flue gas shrinks and diffuses, and then condenses, and then is captured by the demister. It realizes the efficient and deep treatment of fine liquid droplets, fine dust particles, aerosols and other tiny particles in the flue gas, and the dust removal efficiency can reach 80%.

Compared with the prior art, the beneficial effect of the utility model is that the structure of the device is simple, the running resistance is low, the safety and reliability are high, the optimized treatment process is fast and the cost is low, and the fine liquid droplets in the flue gas can be effectively removed , fine dust particles, aerosols and other tiny particles, especially compared with the wet electrostatic precipitator and process that can achieve the same purification effect, there are no electrical components, energy consumption is reduced, and the economic cost is greatly reduced; moreover, it is easy to install and is suitable for combustion Coal, fuel oil, gas thermal power plants, metallurgy, chemical industry, solid waste (garbage) treatment and other related industries in the field of clean flue gas dust removal and fog removal.

Description of drawings

Fig. 1 is the schematic diagram of the longitudinal section structure of the passive plate type wet dust and mist removal device of the utility model in embodiment 1;

Fig. 2 is a schematic diagram of the vertical section structure of the Venturi air guide channel of the passive plate-type wet dedusting and demisting device of the utility model in embodiment 1;

Fig. 3 is a schematic diagram of the vertical section structure of the passive plate-type wet dust and mist removal device of the utility model in embodiment 2;

Fig. 4 is a schematic view of the vertical section structure of the Venturi air guide channel of the passive plate-type wet dedusting and demisting device of the utility model in embodiment 2;

Fig. 5 is a schematic diagram of the vertical section structure of the passive plate-type wet dedusting and demisting device of the utility model in embodiment 3;

Fig. 6 is a schematic plan view of the vertical cross-sectional structure of the Venturi air guide channel of the passive plate-type wet dust and mist removal device of the present invention in embodiment 3.

As shown in the figure: 1-smoke inlet channel, 2-atomizing nozzle, 3-partition plate, 4-air guide plate, 5-mist eliminator, 6-smoke outlet channel, 7-contraction section, 8-throat, 9-diffusion section, 10-arc curve type air guide plate.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described.

Example 1

As shown in Figure 1, a passive plate-type wet dedusting and demisting device of the present invention includes a housing with a smoke inlet channel 1 and a smoke outlet channel 6 at both ends, and atomizing nozzles are sequentially arranged in the housing 2. Venturi air guiding channel and mist eliminator 5, wherein, the atomizing nozzle 2 is adjacent to the smoke inlet channel 1, and the mist eliminator 5 is connected to the smoke outlet channel 6.

In the above embodiment, in order to enhance the condensation effect of the flue gas after passing through the Venturi gas channel, as shown in Figure 1 and Figure 2, there are multiple groups of the Venturi gas channel, each group of the Venturi gas channel It is composed of a plurality of partitions 3 and air guide plates 4; the Venturi air guide channel includes a constriction section 7, a throat 8 and a diffusion section 9 connected in sequence, wherein the constriction section 7 is connected to the atomizing nozzle 2 Adjacent, the diffuser section 9 is adjacent to the demister 5 . In order to enhance the treatment effect of dust removal and fog removal, preferably, among the plurality of air guide plates 4, the ratio of the distance between adjacent air guide plates 4 to the height of the air guide plates 4 is 1:8 to 40:1 ; Preferably, the distance between adjacent air guiding plates 4 is 0.2 to 1 meter, and the height of the air guiding plates 4 is 0.5 to 8 meters.

In the above embodiment, in order to ensure the effect of dust removal and mist removal, the demister is preferably a vertical plate demister so as to effectively cooperate with the Venturi air guide channel; in order to ensure the stability of the overall operation of the device, the demister The channel wall of the Venturi air guide channel, that is, the air guide plate 4 and the partition plate 3 are made of acid-resistant stainless steel, carbon steel coated with glass flake anticorrosion layer, glass steel, PP and PVC.

In the above embodiments, the atomizing nozzles 2 are set according to the actual working conditions of the flue gas treatment, and the atomizing nozzles 2 can be in one group or in multiple groups. There is no special requirement for its distribution method. It can be distributed in one layer or in various directions. Specifically, the standard is to maximize the contact of the atomized water with the flue gas; in order to fully ensure the condensation of tiny particles in the flue gas, so that Collected in the demister, the distance between the atomizing nozzle 2 and the partition 3, the distance between the adjacent partitions 3, and the distance between the adjacent air guide plates 4 are all preferably: 5cm ~ 50cm; The atomizing nozzle 2 is preferably a device capable of spraying atomized water with a particle size of 20um to 60um.

In the above embodiment, the air guiding plate 4 can be a simple linear plate structure as shown in FIG. 1 and FIG. 2 , or can be a curved structure with a geometric curved surface.

As shown in Figures 1 and 2, after connecting the passive plate-type wet dust and mist removal device of the present invention with the clean flue of the existing wet flue gas purification treatment equipment, the passive plate-type wet dust and dedusting device of the present utility model is applied When the fog device performs dust removal and fog removal treatment for flue gas, the flue gas discharged from the clean flue of the wet flue gas purification treatment equipment enters the flue gas inlet channel 1, and first contacts with the atomized water sprayed from the atomizing nozzle 2, Then, through the action of the Venturi air guide channel, it is processed by the mist eliminator 5, and the smoke gas after such deep purification is discharged through the smoke outlet channel 6. Preferably, the atomizing nozzle 2 sprays atomized water with a droplet size ranging from 20um to 60um, the smoke is mixed with the atomized water, and the smoke mixed with the atomized water enters the Venturi After the air guide channel, it is processed through the constriction section 7, the throat section 8 and the diffusion section 9 in sequence, and then is trapped in the demister to ensure the collection of tiny particles.

In the above-mentioned dedusting and demisting treatment process, the flue gas is processed through the passive plate wet dedusting and demisting device vertically or parallel to the clean flue of the original wet flue gas purification treatment equipment.

In the above-mentioned dedusting and demisting treatment process, since the flue gas is a flue gas under pressure, the pressure of the flue gas itself and the power of the flue gas movement form a pressure difference power at both ends of the Venturi air guide channel, In the air-guiding channel, under the action of the channel wall of the Venturi air-guiding channel, the flue gas forms a violent disturbance of the gas-liquid two-phase, which makes the fine particles in the flue gas, such as fine liquid droplets, fine dust particles, and aerosols, interact with each other. Collision and agglomeration condense into large droplets, which are then captured by the liquid film on the surface of the channel wall by the cyclone to achieve the purification effect of removing tiny particles, thereby improving the removal efficiency of tiny particles in the flue gas; specifically, the flue gas enters After the constriction section 7, as the passage narrows, the flow velocity increases, and when entering the throat 8, the flue gas flow velocity reaches the maximum value, during which the flue gas enters the throat 8 through the constriction section 7 of the Venturi air guide channel , the channel gradually narrows, making the flue gas velocity faster, realizing the overall acceleration of the flue gas and the increase of the relative flow velocity between the flue gas phases. Small and medium-sized water droplets and tiny particles form turbulence and fully collide, so that the dust particles in the atomized flue gas, which is already saturated in humidity, are wetted by water, and then the fine liquid droplets, fine dust particles, aerosols and other tiny particles in the flue gas Collide with each other and unite and condense; after the flue gas enters the diffusion section 9, the flow velocity of the flue gas decreases, and the agglomeration with tiny particles such as dust particles as condensation nuclei accelerates, and condenses into dusty droplets with a larger diameter. Part of the droplet is captured by the liquid film on the wall surface of the Venturi air guide channel, and the rest enters the mist eliminator to be captured, so as to achieve the purification effect of efficiently removing tiny particles in the flue gas.

Through the above-mentioned dust removal and fog removal treatment, it does not need to consume electricity like a wet electrostatic precipitator, and realizes passive deep purification and removal of tiny droplets, fine dust particles, aerosols and other tiny particles in the flue gas. The wet treatment effectively avoids The impact on the equipment and the environment during the flue gas treatment and discharge process is minimized; moreover, because it can be combined with the clean flue of the existing treatment system, it saves a lot of space; The optimized combination of the channel and the demister 5 makes the whole run with low resistance, which is equivalent to the resistance of the three-layer conventional plate demister, effectively ensuring the stability and reliability of the overall operation of the device; There are no special restrictions on the existing wet flue gas purification treatment equipment of the plate wet dedusting and demisting device, such as limestone calcium desulfurization system, ammonia desulfurization system, double alkali desulfurization system and wet denitrification system, wet mercury removal system and others Wet flue gas treatment devices combined with desulfurization, denitrification and demercury can all be applied. The passive plate wet dedusting and demisting treatment process carried out by applying the wet flue gas treatment device combined with desulfurization, denitration and demercuration of the utility model fully utilizes the characteristics of the flue gas and equipment, and uses the pressure of the flue gas itself as the driving force. The wall of the Venturi air guide channel collides, changing the movement direction and speed of the flue gas, causing the flue gas to shrink and diffuse, and then condense to meet the requirements of the mist eliminator. Efficient and advanced treatment of fine liquid droplets, fine dust particles, aerosols and other tiny particles in the air, the dust removal efficiency can reach 50% to 90%.

Example 2

As shown in Figure 3 and Figure 4, a passive plate-type wet dust and mist removal device of the present invention has the same basic configuration and application as in Embodiment 1, wherein the air guide plate 4 is an arc-shaped air guide plate 10. The arc curved plate 10 and the partition 3 form a Venturi air guide channel. This setting can increase the number and intensity of collisions between the flue gas and the Venturi air guide channel wall, accelerate the change of the movement direction and speed of the smoke gas, and increase the amount of smoke. The strength of gas contraction and diffusion, thereby accelerating condensation, and more effectively promoting the condensation of tiny particles in the flue gas.

Example 3

As shown in Figure 5 and Figure 6, a passive plate-type wet dust and mist removal device of the present invention has the same basic configuration and application as that of Embodiment 1 or Embodiment 2. It consists of several groups of venturi tubes, and each group of said venturi tubes is formed by connecting a plurality of separators 3 and air guide plates 4 .

In the above-mentioned embodiment, compared with Embodiment 1 or Embodiment 2, the gap of the Venturi air conduction channel is reduced, and the chance of the flue gas mixing to meet the Venturi air guide channel wall is increased, which is beneficial to increase the resistance of the Venturi air guide channel wall to large Droplet capture ability.

In the above embodiment, in order to enhance the removal effect of tiny particles in the flue gas, preferably, the distance between adjacent air guide plates 4 is 0.5 meters, the height of the air guide plates 4 is 0.7 meters, and the atomizing nozzle 2 and The distance between the dividing plates 3 is 0.3 meters, the distance between the adjacent dividing plates 3 is 0.2 meters, and the distance between the adjacent air guiding plates 4 is 0.05 meters; A device for atomizing water with a particle size of 40um.

When the above-mentioned passive plate-type wet dust and fog removal device is used for dust and fog removal treatment, the basic method is the same as that of embodiment 1 or embodiment 2, taking the treatment of 50mg/ ^Nm3 flue gas entering the smoke inlet channel 1 as an example, passing through the atomizing nozzle 2 After the sprayed atomized water is atomized, in the Venturi tube, the average flow velocity of the flue gas in the contraction section 7 is 5m/s-10m/s, and the flow velocity of the flue gas in the throat 8 is 15m/s-50m /s, the average flow velocity of the flue gas in the diffusion section 9 is 2m/s~6m/s. The gas can reach below 10mg/Nm ³ , and the dust removal efficiency can reach more than 80%.

The utility model is not limited to the above-mentioned embodiments, and any obvious improvements or changes made by those skilled in the art to the above-mentioned embodiments will not exceed the concept of the utility model and the scope of protection of the appended claims.

Claims (8)

1. Passive plate-type wet dedusting and mist removal device, including a housing with smoke inlet and smoke outlet channels at both ends, characterized in that an atomizing nozzle, a Venturi air guide channel and a dehumidifier are sequentially arranged in the housing. A fogger, wherein the atomizing nozzle is adjacent to the smoke inlet channel, and the mist eliminator is connected to the smoke outlet channel. 2. The passive plate-type wet dedusting and demisting device according to claim 1, characterized in that: the demister is a vertical plate demister; 20um ~ 60um atomized water device. 3. The passive plate-type wet dedusting and demisting device according to claim 1 or 2, characterized in that: the Venturi air guide channel includes a constriction section, a throat and a diffusion section connected in sequence, wherein the constriction A segment is adjacent to the atomizing nozzle, and the diffuser segment is adjacent to the demister. 4. The passive plate-type wet dust and mist removal device according to claim 3, characterized in that: the Venturi air guiding channel is composed of multiple groups of Venturi tubes. 5. The passive plate-type wet dedusting and demisting device according to claim 3, characterized in that: said Venturi air guiding channel has multiple groups, and each group of said Venturi air guiding channel is composed of a plurality of partitions and air guiding channels. board composition. 6. The passive plate-type wet dust and mist removal device according to claim 5, characterized in that: among the plurality of air guide plates, the ratio of the distance between adjacent air guide plates to the height of the air guide plates is 1:8 to 40:1. 7. The passive plate-type wet dust and mist removal device according to claim 5, characterized in that: the distance between adjacent air guiding plates is 0.2 to 1 meter; the height of the air guiding plates is 0.5 to 8 meters. meters; the distance between the atomizing nozzle and the partition is 5 cm to 50 cm; the distance between adjacent partitions is 5 cm to 50 cm. 8. The passive plate-type wet dust and mist removal device according to claim 1 or 2, characterized in that: the channel wall of the Venturi air guide channel is made of acid-resistant stainless steel, carbon steel coated with glass flake anti-corrosion layer, glass steel, A composition of PP and PVC.