CN204637887U - Multistage many cyclones demist dust arrester - Google Patents

Abstract

The utility model relates to a multi-stage multi-cyclone demist and dust removal device, which comprises an absorption tower, the outer top of the absorption tower is provided with a flue gas outlet, the outer middle part of the absorption tower is provided with a flue gas inlet, the inner bottom of the absorption tower is provided with a pulp pool, and The spray layer arranged on the inner wall of the absorption tower is provided with a number of demist and dust collectors and grid supports for fixing the demist and dust removers above the spray layer. The superior effect of the utility model lies in that the system resistance of the multi-stage multi-cyclone demist and dust removal device is small, and the effect of demist and dust removal is high. In the case of the same purification rate, the multi-stage multi-cyclone demist and dust removal device of the utility model does not consume electricity and has low energy consumption, which avoids the defect of the peak value of dust emission caused by the stop discharge of the traditional wet dust removal equipment during cleaning. At the same time, it also solves the problems of high space requirements, great difficulty, long renovation period, high initial investment and high operating costs for the renovation of electrostatic precipitator. It only needs to use the original absorption tower for renovation without changing the external structure of the absorption tower.

Description

Multi-stage multi-cyclone mist removal and dust removal device

technical field

The utility model relates to the technical field of flue gas deep purification, in particular to a multi-stage multi-cyclone mist and dust removal device.

Background technique

At present, China has many industrial tail gas and flue gas pollution control technologies, among which the relatively mature and representative technologies are: limestone-gypsum method, ammonia method, double alkali method and other wet desulfurization technologies for sulfur dioxide pollution control, wet desulfurization technology After spraying, washing and purifying, it is necessary to install a mist eliminator to remove the tiny droplets generated during the spraying process; as far as the current actual situation is concerned, no matter whether it is a flat type mist eliminator or a roof type mist eliminator, it is necessary to install a demister less than 5um and small The removal efficiency of tiny particles such as sulfate, sulfite, nitrate, and nitrite in 5um dust and aerosols that make up PM2.5 is difficult to meet the environmental protection requirements. In order to meet the increasingly stringent environmental protection requirements, wet electrostatic precipitators need to be installed at the back end of wet desulfurization devices for moderate purification. Although wet electrostatic precipitator can effectively remove tiny particles, there are many problems in wet electrostatic precipitator, such as large and bulky process equipment, large space occupation, high initial investment, high energy consumption in operation, and difficulty in retrofitting existing projects.

China, whose publication number is CN104226073A, discloses a fog and dust removal device and a smoke removal and dust removal system for flue gas treatment, including a cooling device, wherein: the heat-absorbing part of the cooling device is located on the path of the flue gas flow; The heat absorbing part of the cooling device can cool the flue gas below the water dew point; the heat absorbing part of the cooling device includes at least one heat exchange tube, wherein: the cooling medium output port of the cooling part of the cooling device It communicates with the cooling medium inlet of the heat exchange tube, and the cooling medium input port of the heat dissipation part of the cooling device communicates with the cooling medium outlet of the heat exchange tube. The heat absorbing part of the cooling device includes at least two rows of the heat exchange tubes, wherein: the heat exchange tubes are made of fluoroplastic material, and each row of the heat exchange tubes includes at least two of the heat exchange tubes; The axial direction of the heat exchange tubes is perpendicular to the flow direction of the flue gas; the axis lines of the heat exchange tubes in the same row are located on the same plane, and the extension direction of the plane is the same as that of the flue gas The flow directions of the heat exchange tubes are parallel; the distance between the heat exchange tubes in adjacent rows is 2 to 3 times the diameter of the heat exchange tubes. The fog and dust removal device is a traditional dust and fog removal device, and has a complex structure, high energy consumption, high modification cost, and poor practicability.

Utility model content

The purpose of the utility model is to overcome the deficiencies in the prior art, and provide a multi-stage multi-cyclone demist and dedusting device for efficient dedusting and demisting after the wet desulfurization device is sprayed.

The utility model is achieved through the following technical solutions:

The multi-stage and multi-cyclone demist and dust removal device includes an absorption tower, the outer top of the absorption tower is provided with a flue gas outlet, the outer middle of the absorption tower is provided with a flue gas inlet, the inner bottom of the absorption tower is provided with a pulp pool, and the absorption tower is installed The spray layer on the inner wall of the spray layer is provided with a number of demisters and dust collectors and grid supports for fixing the demisters; the demisters are arranged in series up and down; The mist dust collector includes an inner cyclone cylinder and an inner cyclone blade arranged inside the inner cyclone cylinder. The inner cyclone blade extends outward from the center of the inner cyclone cylinder to the inner wall of the inner cyclone cylinder. The center of the inner cyclone cylinder is provided with a flushing water pipe. The flushing water pipe is provided with an inner flushing nozzle communicating with it; the outer side of the inner cyclone cylinder is provided with a number of outer cyclone cylinders coaxially arranged with it, and the flushing water pipe extends upward or downward from the inner cyclone cylinder to the outer cyclone cylinder. Outer cyclone blades are arranged between the inner cyclone cylinder and the outer cyclone cylinder, and between the outer cyclone cylinder and the outer cyclone cylinder.

In the technical solution described above, preferably, the flushing water pipe arranged between the inner cyclone cylinder and the outer cyclone cylinder is provided with an external flushing nozzle communicating with it.

The technical solution is preferably that the inclination angles of the inner cyclone blades and the outer cyclone blades are both 20°-60°, and the projected overlapping ratios are -20%-+50%.

Preferably, the technical solution is that the flushing water pipe is provided with a blind tube coaxial with it.

The technical solution is preferably that the distance between the spray layer and the mist and dust remover is 1-3m.

The technical solution is preferably that blind plates are used to block between the demist and dust collectors, and between the demist and dust collectors and the inner wall of the absorption tower.

The technical solution is preferably that the material of the inner cyclone blade and the outer cyclone blade is acid-resistant stainless steel, carbon steel coated with glass flake anti-corrosion layer, glass fiber reinforced plastic, PP and PVC.

The multi-stage multi-cyclone demist and dust removal device described in the utility model is used in a desulfurization device, and is especially suitable for removing fog, dust and aerosol particles after the spray layer of a wet desulfurization device. The working principle of the multi-stage and multi-cyclone mist and dust removal device described in the utility model is: using the kinetic energy of the flue gas in the absorption tower, when the flue gas passes through the inner cyclone blade and the outer cyclone blade of the mist removal and dust removal device, the inner cyclone blade and the outer cyclone blade are Between the walls of the inner cyclone and between the outer cyclone blades and the wall of the outer cyclone, gas-liquid collisions occur. In the flue gas, tiny particles such as fine liquid droplets, fine dust particles, and aerosols collide with each other and agglomerate into relatively small particles. large droplet. Atomized water is sprayed out in an orderly manner through the flushing nozzles installed in the inner cyclone and the outer cyclone, and then a liquid film is established on the inner surface of the inner and outer cyclones to capture the condensed droplets, thereby achieving particle removal and purification purpose of smoke. After the flue gas flows through the inner cyclone blades and the outer cyclone blades, the original vertical upward flow becomes a rotating upward flow. The inner wall moves to more efficiently remove liquid droplets and dust particles in the flue gas.

Compared with the prior art, the utility model has the superior effect that: the system resistance of the multi-stage multi-cyclone demist and dust removal device is small, and the effect of demist and dust removal is high. The device can effectively remove tiny liquid droplets, fine dust particles, aerosols and other tiny particles in the flue gas. When the flue gas is purified by the spray layer and passes through the demister and dust collector, the violent rotation and disturbance of the gas-liquid two-phase is formed on the demist and dust collector and above, so that the fine liquid droplets, dust particles, and aerosols in the flue gas Such tiny particles collide with each other and agglomerate to form larger droplets, and the larger droplets are captured by the liquid film on the inner wall of the inner cyclone and outer cyclone to achieve the purification purpose of removing tiny particles, thereby improving the removal of tiny particles in the flue gas The removal efficiency and dust removal efficiency are high, reaching below 5mg/Nm ³ .

Compared with the traditional wet electrostatic precipitator that achieves the same effect, under the same purification rate, the multi-stage multi-cyclone demist and dust removal device of the utility model does not consume electricity and has low energy consumption, which avoids the traditional wet dedusting equipment from stopping during cleaning. Defects where electrical discharges cause peaks in dust emissions. At the same time, the utility model also solves the problems of high space requirements, high difficulty, long renovation period, high initial investment and high operating costs in the transformation of electrostatic precipitator, and only needs to use the original absorption tower for transformation without changing the exterior of the absorption tower structure.

Description of drawings

Fig. 1 is the structural representation of multi-stage multi-cyclone mist removal and dust removal device described in the utility model;

Fig. 2 is the A-A sectional structural schematic diagram of the multi-stage multi-cyclone demist and dust removal device described in Fig. 1;

Fig. 3 is a structural schematic diagram of the fog and dust removal device described in Fig. 1 .

The accompanying drawings are marked as follows:

1-absorption tower, 2-slurry pool, 3-flue gas inlet, 4-spray layer, 5-grid support, 6-mist and dust collector, 61-inner cyclone cylinder, 62-inner cyclone blade, 63- Rinse water pipe, 631-blind barrel, 64-inner flushing nozzle, 65-outer cyclone, 66-outer cyclone blade, 67-outer flushing nozzle, 7-flue gas outlet, 8-blind plate.

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in further detail.

As shown in the accompanying drawings 1-3, the multi-stage multi-cyclone demist and dust removal device provided by the utility model includes an absorption tower 1, the outer top of the absorption tower 1 is provided with a flue gas outlet 7, and the outer middle of the absorption tower 1 is provided with a smoke outlet. Gas inlet 3, the inside bottom of absorption tower 1 is provided with slurry pool 2, and is arranged on the spray layer 4 of the inner wall of absorption tower 1, and the top of spray layer 4 is provided with some mist and dust removers 6 and is used for fixing described The grid support body 5 of the demist and dust remover 6; the demist and dust remover 6 is arranged in series up and down; the demist and dust remover 6 includes an inner cyclone cylinder 61 and an inner cyclone blade 62 arranged inside the inner cyclone cylinder 61 , the inner cyclone blade 62 extends outward from the center of the inner cyclone cylinder 61 to the inner wall of the inner cyclone cylinder 61, the center of the inner cyclone cylinder 61 is provided with a flushing water pipe 63, and the flushing water pipe 63 is provided with an inner flushing nozzle communicating with it 64; the outside of the inner cyclone 61 is provided with a number of outer cyclones 65 coaxially arranged with it, and the flushing water pipe 63 extends upward from the inner cyclone 61 to the outer cyclone 65; the outer side of the inner cyclone 61 is provided with 3 outer cyclones Outer cyclone blades 66 are provided between the inner cyclone cylinder 61 and the outer cyclone cylinder 65 and between the outer cyclone cylinder 65 and the outer cyclone cylinder 65 . The inner cyclone blades 62 and the outer cyclone blades 66 have been combined and arranged in concentric circles.

In order to improve the effect of demisting and dust removal, an outer washing nozzle 67 communicating with the washing water pipe 63 arranged between the inner cyclone cylinder 61 and the outer cyclone cylinder 65 is installed. The inner flushing nozzle 64 and the outer flushing nozzle 67 provided by the utility model spray water in an orderly manner to establish droplets and dust to capture the water film and remove pollutants on the inner wall of the inner cyclone cylinder 61 and the outer cyclone cylinder 66 . The inclination angles of the inner cyclone blades 62 and the outer cyclone blades 66 are both 20°-60°, and the projected overlapping ratios are -20%-+50%. The inclination angle is relative to the cross section of the mist and dust collector, and specifically refers to the angle between the inner cyclone blade 62 and its orthographic projection, and the angle between the outer cyclone blade 66 and its orthographic projection. The projection overlap rate is (overlapping area of all blades' orthographic projections-gap area between all blades' orthographic projections)/sum of areas of all blades' orthographic projections.

The flushing water pipe 63 is provided with a blind cylinder 631 coaxial with the flushing water pipe 63. The blind cylinder 631 coaxial with the flushing water pipe 63 is beneficial to capture the area of tiny particles and improves the effect of demisting and dust removal. The distance between the spray layer 4 and the mist and dust remover 6 is 1-3m. Blind plates 8 are used to seal between the demisters 6 and between the demisters 6 and the inner wall of the absorption tower 1 . The material of the inner cyclone blade 62 and the outer cyclone blade 66 is acid-resistant stainless steel, carbon steel coated with glass flake anticorrosion layer, glass fiber reinforced plastic, PP and PVC.

The multi-stage multi-cyclone mist and dust removal device can be equipped with multiple unit type mist and dust removers 6 . If the diameter of the absorption tower 1 is small, a unit-type mist and dust collector is used. The number of unit type demist and dust collectors in each absorption tower 1 is determined by the diameter of the absorption tower 1, and the arrangement of the largest number shall prevail. The gap between each unit type demister and dust collector 6 and between the mist and dust remover 6 and the tower wall of the absorption tower 1 is blocked with a blind plate 8, and the blind plate 8 also plays the role of limiting and fixing.

The demist and dust remover 6 described in the utility model has three stages, and the specific number of stages is determined according to the final required demist and dust removal effect. The inner cyclone blade 62 and the outer cyclone blade 66 realize the change and acceleration of the motion direction of the flue gas and the tiny particles in the flue gas, so that the water droplets and the tiny particles in the flue gas form a turbulent flow and fully collide, so that the fine particles in the flue gas Small particles such as liquid droplets, fine dust particles, and aerosols collide with each other and agglomerate to form larger droplets. After the flue gas passes through the inner cyclone blade 62 and the outer cyclone blade 66, its flow mode is to rotate and rise in the inner cyclone cylinder 61 and the outer cyclone cylinder 65, and the liquid droplets in the flue gas are separated from the flue gas under the action of centrifugal force to reach the inner cyclone cylinder. The inner surfaces of the cyclone cylinder 61 and the outer cyclone cylinder 65 are captured by the liquid film on the inner wall surface of the inner cyclone cylinder 61 and the outer cyclone cylinder 65 to achieve the purification purpose of efficiently removing tiny particles. The multi-stage multi-cyclone demisting and dedusting device described in the utility model is widely applicable to flue gas purification in coal-burning, fuel oil, gas-fired power plants, metallurgy, chemical industry, and solid waste (garbage) treatment industries.

The utility model is not limited to the above-mentioned embodiments. Without departing from the essential content of the utility model, any deformation, improvement and replacement conceivable by those skilled in the art all fall within the scope of the utility model.

Claims (7)

1. The multi-stage and multi-cyclone demist and dust removal device includes an absorption tower, the outer top of the absorption tower is provided with a flue gas outlet, the outer middle of the absorption tower is provided with a flue gas inlet, the inner bottom of the absorption tower is provided with a slurry pool, and it is set at The spray layer of the inner wall of the absorption tower, above the spray layer is provided with a number of demister dust collectors and grid supports for fixing the demist collectors; it is characterized in that the demist collectors are connected in series Arrangement; the demist and dust remover includes an inner cyclone cylinder and an inner cyclone blade arranged inside the inner cyclone cylinder, and the inner cyclone blade extends outward from the center of the inner cyclone cylinder to the inner wall of the inner cyclone cylinder, and the inner cyclone blade of the inner cyclone cylinder There is a flushing water pipe in the center, and the flushing water pipe is provided with an inner flushing nozzle connected with it; outside the inner cyclone cylinder, there are several outer cyclone cylinders coaxially arranged with it, and the flushing water pipe extends upward or downward from the inner cyclone cylinder to In the outer cyclone, outer cyclone blades are arranged between the inner cyclone and the outer cyclone, and between the outer cyclone and the outer cyclone. 2. The multi-stage multi-cyclone demist and dust removal device according to claim 1, characterized in that, the flushing water pipe arranged between the inner cyclone cylinder and the outer cyclone cylinder is provided with an outer flushing nozzle communicating with it. 3. The multi-stage multi-cyclone demist and dust removal device according to claim 1, characterized in that, the inclination angles of the inner cyclone blades and the outer cyclone blades are all in the range of 20°-60°, and the projected overlap ratio is -20° %—+50%. 4. The multi-stage multi-cyclone demist and dust removal device according to claim 1, characterized in that, the flushing water pipe is provided with a blind tube coaxially arranged therewith. 5. The multi-stage multi-cyclone mist and dust removal device according to claim 1, characterized in that the distance between the spray layer and the mist and dust remover is 1-3m. 6. The multi-stage multi-cyclone demist and dust removal device according to claim 1, characterized in that blind plates are used to seal between the demist and dust collectors, and between the mist and dust removers and the inner wall of the absorption tower. 7. The multi-stage multi-cyclone demist and dust removal device according to claim 1 or 3, characterized in that, the materials of the inner cyclone blade and the outer cyclone blade all adopt acid-resistant stainless steel, carbon steel coated with glass flake anticorrosion layer, One of FRP, PP and PVC.