CN203075796U - Skewed gas flow type electrostatic fabric filter - Google Patents

Abstract

The utility model discloses an oblique air flow type electric bag composite dust collector, which comprises an air flow distribution area, an electric dust removal area and a bag dust removal area from left to right, and a dust collection area is arranged at the lower part of the dust collection area of the electric dust removal area and the bag dust removal area, The clean air area is located on the upper part of the bag dust removal area. The air distribution area includes two vertically arranged air distribution plates and one oblique air distribution plate; the electrostatic precipitator area includes cathode wires, anode plates, and high-voltage electrical devices; an electric bag joint plate is set at the junction of the electrostatic precipitator area and the bag dust removal area , the bag dust removal area includes air flow deflectors, cloth bags, skeletons and flower plates, the skeleton and cloth bags form a whole and are installed on the flower plates; the dust collection area is composed of ash hoppers and ash hopper baffles; the air purification area is mainly composed of partitions composition. The utility model obtains the best air distribution in the electric bag composite dust collector, reduces the generation of eddy current in the electric dust removal area, reduces the running resistance of the cloth bag dust removal area, reduces the secondary dust, and ensures the low cost of the electric bag composite dust collector. prevent efficient operation.

Description

Inclined air flow electric bag composite dust collector

technical field

The utility model relates to an environmental protection device, in particular to an oblique air flow electric bag composite dust collector. the

Background technique

Dust is the enemy of human health, especially the floating dust with a particle size between 0.5 and 5 μm (that is, dust floating in the atmosphere for a long time or even several years), which is the most harmful to people. Dust particles with a particle size > 5 μm can be eliminated by nose hair and respiratory mucus due to inertia; dust particles with a particle size < 0.5 μm can also be adhered to the surface of the upper respiratory tract due to gas diffusion and then discharged with sputum. Only the floating dust with a particle size of 0.5-5 μm can directly reach the lungs and deposit through the respiratory tract, which is harmful to the human body. The degree of harm depends on the particle size, solubility, chemical composition and harmful gases and microorganisms adsorbed by the particles. Most of the 0.5~5μm floating dust comes from the dust generated by coal combustion. the

Coal-fired boilers currently use various dedusting technologies to capture fly ash particles in the flue gas. Among them, the electrostatic precipitator is commonly used. Since the dust removal efficiency of the electrostatic precipitator is greatly affected by the nature of the dust, and the composition of coal is greatly different, the nature of the dust produced is also different. The ability of the electrostatic precipitator to capture fine particles is limited. Under the requirements, the usual four-field or five-field electrostatic precipitator can no longer meet the requirements of emission standards. the

Compared with electrostatic precipitator, bag filter has its incomparable advantages. It performs better in capturing ultra-fine dust (0.5~5μm), and is basically not affected by factors such as dust concentration, specific resistance, particle size distribution, etc. It can still easily achieve 50mg/Nm when filtering high-concentration flue gas The emission standard required below ³ can even reach about 10mg/Nm ³ , and the dust removal efficiency can reach more than 99.9%. However, the running resistance of the bag filter is high, and the service life of the filter bag is short, which is related to the flow rate of the flue gas and the operating resistance, and the chemical fiber filter bag cannot withstand the passage of high-temperature flue gas, and has a relatively large impact on the moisture content and oily substance content in the flue gas. strict requirements.

Electric bag composite dust removal is an organic combination of electric dust removal and bag dust removal. It has high dust removal efficiency and can better meet the current high emission standards. It has been gradually applied and promoted in recent years. The electrostatic bag composite dust collector is usually composed of two units, namely the electrostatic dust removal unit and the bag dust removal unit. Generally, one or two electric fields are arranged in the electrostatic precipitator unit. This kind of electric bag composite dust removal is the front electric back bag type, which theoretically combines the respective advantages of electric dust removal and bag dust removal. Its basic idea is to pre-collect more than 70% of the dust in the flue gas by the front-stage electric field, and then collect the remaining fine dust in the flue gas by the back-stage bag dust collector. The pre-dust removal of the front stage electric field reduces the dust load of the filter bag, thus also reduces the rising rate of the bag dust removal resistance. In addition, the charging of the same charge makes the powder cake layer loose, and under the same dust load, the resistance of the powder cake layer with the same charge is smaller. The joint effect of the electric bag composite dust collector makes the dust cleaning period of the filter bag longer, which can save the dust cleaning energy consumption of dust removal and prolong the service life of the filter bag. That is to say, the electric bag composite dust removal uses the first-level electric field to charge and capture large particles of dust, thereby greatly reducing the dust concentration of the flue gas entering the filter bag chamber, effectively avoiding the impact of large particles of dust on the filter bag under the action of inertial force Flushing is beneficial to prolong the service life of the filter bag. Because the dust has the same charge under the action of the electric field, the dust layer attached to the outer surface of the filter bag is relatively loose, the air permeability of the filter is very good, and it is easier to clean the dust, so it can effectively reduce the running resistance of the equipment and save the operating cost of the equipment . the

At present, the conventional electrostatic bag composite dust collector adopts the design of uniform flow distribution, but this structure will cause two problems: one is that the operating speed of the electrostatic precipitator area cannot be too high, otherwise it will cause more eddy currents to be formed in the electrostatic precipitator area, resulting in Secondary dusting will seriously affect the dust removal efficiency of electrostatic precipitator. The second is that the electrostatic precipitator area and the bag dust removal area are closely combined, resulting in the inability of the airflow to effectively form a vertical airflow in the bag dust removal area, which greatly reduces the utilization rate of the bag, and will cause local damage to the bag, affecting the efficiency of bag dust removal. the

Utility model content

The purpose of this utility model is to solve the problems in the prior art, and propose an oblique airflow type electric bag composite dust collector, which can solve the problem of low dust removal efficiency and low operating speed caused by the air flow distribution problem in the current electric bag composite dust collector , short service life of cloth bags and other issues, the specific technical solutions are as follows. the

Inclined airflow electrostatic bag composite dust collector, including the air distribution area distributed from left to right, the electrostatic precipitator area and the bag dust removal area, the dust collection area is set below the electrostatic precipitator area and the bag dust removal area, and the dust collection area is set above the bag dust removal area. Clean air area, the 5 areas are installed in a housing; the air distribution area includes two vertical air distribution plates and an inclined air distribution plate arranged at intervals from left to right, and the inclined air distribution plate is located in the air distribution area The junction with the electrostatic precipitator area; the electrostatic precipitator area includes cathode lines and anode plates, and the cathode lines and anode plates are placed crosswise in the electrostatic precipitator area, and a high-voltage electrical device is installed above the cathode line; the bag filter area includes two Each room includes an airflow deflector, a flower plate, a number of supporting frames and cloth bags. Each cloth bag is nested outside the supporting frame to form a whole as a dust removal unit. Each dust removal unit is installed on the flower plate. The flow plate is set in the lower part of the bag dust removal area, and an electric bag combination plate is set between the two chambers; another electric bag combination plate is set at the junction of the electrostatic dust removal area and the bag dust removal area; a partition is placed in the middle of the clean gas area plate. the

Further optimized, the inclined airflow distribution plate is located at the junction of the airflow distribution area and the electrostatic precipitator area, connecting the airflow distribution area and the electrostatic precipitator area, and the inclined airflow distribution plate is a porous plate. the

Further optimized, the hole diameter of the porous plate is 50-80mm, the opening ratio is 0.3, the deflection angle α between the center surface of the porous plate and the vertical direction is 3°-10°, and guide fins are arranged at intervals on the porous plate. the

Further optimized, the electric bag combination plate is a uniformly distributed porous plate, which is placed vertically at the junction of the electrostatic precipitator area and the bag dust removal area. the

Further optimized, the openings of the uniformly distributed porous plate are circular, the aperture size is 100-150mm, the opening ratio is 0.2, and the lower edge of the electric bag combination plate is 100-500mm longer than a dust removal unit, so that the electric dust removal area Part of the airflow passes through the opening of the electric bag combination plate, and part of it passes through the lower part of the electric bag combination plate and enters the bag dust removal area. the

Further optimized, the airflow deflector is a porous plate structure, the deflection angle β between the central surface of the airflow deflector and the horizontal direction is 5°~30°, and the openings of the airflow deflector adopt a form of dense top and sparse bottom.

Further optimized, the dust removal in the electrostatic precipitator area adopts the mechanical rapping method; the dust removal in the cloth dust removal area adopts the pulse back blowing method. the

The direction of the flue gas during dust removal is: the dust-laden flue gas enters from the entrance of the oblique air flow type electric bag composite dust collector, passes through the second layer of air distribution plate and then reaches the third layer of oblique air distribution plate, due to the oblique air flow distribution plate of the third layer Due to the guide flow, the airflow direction is deflected at a certain angle, and the airflow in the electrostatic precipitator area is formed as an oblique airflow, which can effectively use the space in the electrostatic precipitator area. The flow plate enters the bag dust removal area and forms a vertical airflow in the bag dust removal area. The dust particles are intercepted by the bag fiber interception, and the flue gas enters the clean air chamber and flows out through the outlet. the

Compared with the prior art, the utility model has the advantage that: the utility model introduces the dust-laden flue gas obliquely into the electrostatic precipitator area by setting the oblique airflow distribution plate and the bag airflow deflector, so as to avoid the generation of dust in the electrostatic precipitator area. Large eddy current improves the dust removal efficiency in the electrostatic precipitator area and reduces the dust concentration entering the bag dust removal area. At the same time, the air flow enters the bag dust removal area through the electric bag combination plate and the bag air deflector, and through the action of the bag air flow deflector, the air flow forms a vertical flow in the bag dust removal area, which increases the utilization area of the bag dust removal area. , to reduce the damage caused by local scouring, and at the same time, through the function of the deflector, the airflow produces a relatively uniform flow in the bag dust removal area with a wide distribution of flow direction, which reduces the problem of excessive airflow velocity as a whole. The utility model obtains the best airflow distribution in the electric bag composite dust collector by combining the oblique air flow technology and the current equalization technology, thereby improving the performance of the electric bag composite dust collector, reducing the generation of eddy currents in the electric dust removal area, and reducing the The operation resistance of the bag dust removal area is reduced, the secondary dust is reduced, and the low resistance and high efficiency operation of the electric bag composite dust collector is guaranteed. Especially suitable for large flow flue gas treatment. the

Description of drawings

Fig. 1 is a schematic diagram of the structure of the oblique air flow electric bag composite dust collector of the present invention. the

Detailed ways

Below in conjunction with accompanying drawing, the structure of the utility model and working process are described in detail, but the implementation and protection of the utility model are not limited thereto. the

As shown in Figure 1, the oblique airflow electrostatic bag composite dust collector includes the air distribution area 2 distributed from left to right, the electrostatic precipitator area 4 and the bag dust removal area 7, and the dust collection is set under the electrostatic precipitator area 4 and the bag dust removal area 7 Area 11, a clean air area 6 is provided above the bag dust removal area 7, and the five areas are installed in a housing; the air distribution area 2 includes two vertically placed air distribution plates 15 and An oblique airflow distribution plate 3, the oblique airflow distribution plate 3 is located at the junction of the airflow distribution area 2 and the electrostatic precipitator area 4; the electrostatic precipitator area 4 includes cathode lines and anode plates 13, and the cathode lines and anode plates are placed crosswise in the electrostatic precipitator area, A high-voltage electrical device 16 is installed on the cathode line; the bag dust removal area includes two chambers arranged left and right, each chamber includes an air flow deflector 12, a flower plate 14, several supporting frames and cloth bags, and each cloth bag is nested in The outside of the support frame forms a whole as a dust removal unit 8, each dust removal unit 8 is installed on the flower plate 14, the air flow deflector 12 is set at the lower part of the bag dust removal area, and the electric bag joint plate 5 is arranged between the two rooms ; Set another electric bag joint plate 5 at the junction of the electrostatic precipitator area 4 and the bag filter area 7 ; the

Its use method is: the dust-laden smoke enters the electrostatic precipitator area 4 from the intake smoke box 1 through the inclined air flow distribution plate 3, and the inclined air flow distribution plate can guide the gas in the intake smoke box into an oblique air flow and enter the electrostatic precipitator area , the airflow in the electrostatic precipitator area is oblique airflow from the center line of the inlet horn to the center line of the electric bag combination plate. The electrostatic precipitator area contains two electric fields, which are composed of cathode and anode. The cathode line can be burr-shaped, and the anode plate can be The conventional C480 type is adopted, and the dust cleaning system adopts the mechanical vibration method, and the dusty flue gas is removed in the electrostatic precipitator area by 70%-80% of the dust particles. The baffle 10 is set, and the settled dust is discharged by the pneumatic conveying system. the

The primary purified flue gas enters the bag dust removal area 7 through the air flow deflector 12 and the electric bag combination plate 5. The air flow deflector 12 can guide the horizontal flue gas into a vertical air flow, and in the bag dust removal area The airflow distribution is more even. Due to the interception effect of the bag fiber, the dust particles are intercepted, and the flue gas can pass through. With the progress of dust removal, the thickness of the dust accumulation on the surface of the bag gradually increases. When the filtration time reaches the set value, the pulse compressed air enters the inside of the bag , the bag produces a sharp expansion movement, and the dust is separated from the surface of the bag and falls into the ash hopper due to the kinetic energy generated by the movement of the bag. The purified flue gas enters the clean air chamber from the outlet of the bag, and then enters the chimney from the outlet 9 of the electric bag filter. the

The oblique airflow distribution plate at the entrance can generate a horizontal downward oblique airflow, which can effectively reduce the generation of eddy current in the electrostatic precipitator area, increase the airflow propulsion speed, and increase the dust removal efficiency in the electrostatic precipitator area; The flow partition plate is set, and the perforated plate is set at the lower part, which can effectively reduce the direct erosion of the bag and improve the dust removal efficiency of the bag. The utility model organically combines oblique airflow technology with the airflow distribution plate, and combines the opening size of the partition plate to obtain the best airflow movement form, thereby improving the dust removal efficiency, reducing secondary dust, increasing the service life of the bag, and high dust removal efficiency. Low running resistance (<800Pa), long bag life, and high standard emission (≤30mg/Nm ³ ), especially suitable for large flow flue gas treatment.

Claims (8)

1. oblique airflow type electric bag complex dust collector, it is characterized in that comprising distribution of air flow district (2) by left-to-right distribution, electric precipitation district (4) and bag-type dust district (7), below in electric precipitation district (4) and bag-type dust district (7) is provided with accumulation area (11), be provided with pure qi (oxygen) district (6) in bag-type dust district (7) top, these 5 districts are installed in the housing; Distribution of air flow district (2) comprises that tiltedly airflow-distribution board (3) is positioned at the junction of distribution of air flow district (2) and electric precipitation district (4) by left-to-right spaced successively two airflow-distribution board (15) and oblique airflow-distribution boards (3) of vertically placing; Electric precipitation district (4) comprises cathode line and positive plate (13), and cathode line and positive plate intersect in the electric precipitation district to be placed, and high-voltage electric device (16) is installed on cathode line top; Two chambers of arranging about the bag-type dust district comprises, each chamber includes air flow guiding plate (12), card (14), some support frames and cloth bag, each bar cloth bag is nested in the support frame outside and forms a whole as a dust removing units (8), each dust removing units (8) is installed on the card (14), air flow guiding plate (12) is arranged on the bottom in the bag-type dust district, is provided with electricity bag board (5) between two chambers; Another electricity bag board is set in the junction of electric precipitation district (4) and bag-type dust district (7); The centre in pure qi (oxygen) district (6) is mounted with dividing plate (17).

2. oblique airflow type electric bag complex dust collector according to claim 1, it is characterized in that: described oblique airflow-distribution board (3) is positioned at the junction in distribution of air flow district and electric precipitation district, distribution of air flow district and electric precipitation district are coupled together, and tiltedly airflow-distribution board is a porous plate.

3. oblique airflow type electric bag complex dust collector according to claim 2, it is characterized in that: the aperture of described porous plate is 50 ~ 80mm, percent opening is 0.3, and the deflection angle α of porous plate median plane and vertical direction is 3 ° ~ 10 °, and flow deflector is set on the porous plate at interval.

4. oblique airflow type electric bag complex dust collector according to claim 1 is characterized in that: described electricity bag board (5) is uniform porous plate, vertically is placed on the junction of electric precipitation district (4) and bag-type dust district (7).

5. oblique airflow type electric bag complex dust collector according to claim 4, the perforate that it is characterized in that described uniform porous plate is for circular, pore size is 100-150mm, percent opening is 0.2, the lower edge of electricity bag board is than the long 100 ~ 500mm of a dust removing units (8), make the air-flow part in electric precipitation district pass through in the perforate of electricity bag board, a part in the bottom of electricity bag board by entering the bag-type dust district.

6. oblique airflow type electric bag complex dust collector according to claim 1 is characterized in that: described air flow guiding plate (12) is a perforated plate construction, the deflection angle of air flow guiding plate (12) median plane and horizontal direction βBe 5 ° ~ 30 °, the form of upper tightly lower sparse is adopted in the perforate of air flow guiding plate (12).

7. oblique airflow type electric bag complex dust collector according to claim 1 is characterized in that: the deashing in described electric precipitation district adopts the mechanical vibrator mode; The deashing of cloth dress dedusting area adopts the pulse backblowing mode.

8. oblique airflow type electric bag complex dust collector according to claim 1 is characterized in that: accumulation area (11) is made up of ash bucket and ash bucket baffle plate (10), and ash bucket baffle plate (10) is installed in ash bucket top.

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