CN204469486U - The compound two-phase deduster of electrofiltration - Google Patents

Abstract

The utility model relates to an electric filter compound two-phase dust collector. The anode row of the dust collector is composed of a plurality of metal filter cartridges arranged in parallel. On the top beam of the shell, a metal filter cartridge is used to replace the anode plate of the electrostatic precipitator as the anode system of the electrostatic precipitator. The composite dust collection room is composed of an electric field and a metal filter cartridge; the blowing pipe with air holes is installed on the top of the dust collector The metal filter cartridge of the lower anode row is blown back so that the dust attached to the outer surface of the filter cartridge falls into the ash hopper; Hit the mechanism for vibration. This equipment collects dust in two phases under the action of electric field force and airflow power, does not generate secondary dust, and the system resistance is relatively low ≤500Pa; the dust filtration and collection speed is increased by 60 times, the life of the filter cartridge can reach 10 years, and the dust removal efficiency η≥99.95 %, the absorption of fine dust (≤1u), can meet the PM2.5 emission requirements.

Description

Electric filter compound two-phase dust collector

technical field

The utility model relates to the technical field of electric filter dust removal of electrostatic precipitators, in particular to an electric filter compound double-phase dust collector.

Background technique

The traditional dust removal methods currently mainly adopt two dust removal principles, one is the principle of electrostatic dust removal, and the other is the principle of filter dust removal. The principle of electrostatic precipitator is the ideal dust removal method recognized by the industry in history. If the problem of secondary dust emission of the electrostatic precipitator itself can be solved, it will be the most ideal industrial waste gas dust removal equipment. The principle of electrostatic dust removal technology is: neutral dust is charged through the electric field and is adsorbed by the opposite electrode under the action of the electric field force. After the charge is released, the dust is collected by vibration cleaning. The advantages of the electrostatic precipitator are: the resistance of the equipment is small, generally ≤300Pa, it is suitable for high temperature and high corrosion industries, the maintenance amount is small, the operation is stable, and the operation cost is low. But the main disadvantages are: the secondary dust problem cannot be suppressed, and it is difficult to meet the increasing existing national standards for atmospheric emissions under the condition of online monitoring.

The principle of filter dust removal technology is: dust is adsorbed on the surface of the filter bag in the dirty air chamber under the action of the air flow force. When the dust accumulation reaches a certain thickness, pulse air flow is injected into the filter bag mouth of the clean air chamber. Next, the expanded dust of the filter bag falls off and is recycled. The advantage of the bag (filter type) dust collector is that it can ensure that the discharge reaches the standard (provided that the filter bag is not damaged), but its main disadvantage is that the equipment has a large operating resistance, generally 1000-1500Pa, and the filter bag is easily damaged. The amount of maintenance is large, the operating cost is high, and it cannot be used in high-temperature, high-corrosion, and high-humidity environments.

Under the condition that the national environmental protection emission requirement is ≤50mg/Nm ³ , most enterprises in China use electrostatic precipitators as dust removal equipment for industrial waste gas, but with the improvement of the national environmental protection emission standard (≤30mg/Nm ³ ). The electrostatic precipitator can no longer meet the requirements of the new standard due to its own secondary dust problem, so under the existing conditions, most enterprises have to choose the bag filter as the dust removal equipment for industrial waste gas. However, due to the shortcomings of the bag filter, such as large resistance and easy damage, it is not an ideal dust removal equipment.

During this period, many dust removal companies at home and abroad have developed electric bag combined dust collectors. The purpose of the research and development is to solve the secondary dust problem of electrostatic precipitators through the combination of electric bags, increase the service life of filter bags, and reduce system resistance. Ozone generated by the dust part seriously oxidizes the filter bag, and the life of the filter bag cannot be increased by reducing the load of the filter bag, and the system resistance increases by 1200-1600Pa in actual operation, so it is actually better to choose the bag filter directly than to use the electric bag filter. At present, there is no dust collector with good comprehensive performance that can overcome the above-mentioned defects preferably.

Utility model content

The purpose of the utility model is to improve the deficiencies of the existing electrostatic precipitator and filter precipitator, comprehensively utilize the advantages of both, and provide a method that can prevent the secondary dust of the electrostatic precipitator and overcome the high specific resistance of the conventional electrostatic precipitator. The anti-corona problem of dust, the system resistance is relatively low, the filter material has a long life, and the dust removal efficiency is greatly improved.

The utility model electric filter compound duplex dust collector adopts a metal (stainless steel wire) filter cartridge to replace the anode plate of the electrostatic precipitator as the anode system of the electrostatic precipitator. Dust quickly gathers on the surface of the filter cartridge under the action of electric field force and air flow force, and falls off under the combined force of pulse back blowing and mechanical rapping for dust removal, realizing two-phase dust collection under the action of electric field force and air flow force. It will not generate secondary dust, and the system resistance is relatively low, usually ≤500Pa. For realizing above-mentioned design the utility model proposes following technical scheme:

An electric filter compound two-phase dust collector, including a number of electric fields arranged sequentially from the air inlet to the air outlet in the dust collector housing, each electric field is composed of a discharge electrode row composed of a number of cathode wires arranged in parallel and a dust collector. Composed of anode rows, the discharge electrode row and the anode row are staggered and connected to the high voltage power supply of the transformer respectively, an electric field channel is set between adjacent electric fields, and a rapping mechanism corresponding to the cathode line is installed on the side of the discharge electrode row, located in the shell Each electric field at the bottom of the body is equipped with an ash hopper, and the feature is that the anode row is composed of a number of metal filter cartridges arranged in parallel, and the metal filter cartridges are correspondingly suspended on the flower plate holes in the dust collector housing and placed The electrode rows are arranged in a staggered manner, the flower plate is fixed on the top beam of the shell, and the composite dust collection room is composed of an electric field and a metal filter cartridge; the blowing pipe installed on the top of the dust collector and distributed with air holes is used to blow back the anode row of the lower filter cartridge , so that the dust attached to the outer surface of the metal filter cartridge falls into the ash hopper; on the side of the anode row arranged with pole spacing, there is a vibrating rod connected to the metal filter cartridge, and the vibrating rod corresponding to each filter cartridge is provided. The rapping mechanism of the hammer performs periodic rapping. The dust in the compound dust collection room is quickly gathered on the surface of the filter cartridge under the action of electric field force and airflow force, and falls off and cleaned under the combined force of pulse back blowing and mechanical rapping, so as to realize the dust removal under the action of electric field force and airflow force. Duplex dust collection.

The rapping anvil is fixedly connected to the rapping rod corresponding to the position of the rapping hammer, so that the rapping force is transmitted from the anvil and the rapping rod to the metal filter cartridge forming the anode row.

The rapping rod and the rapping mechanism containing the rapping hammer are arranged at the lower end of the dust collector, and the rapping mechanism on the side of the discharge electrode row is arranged at the upper middle of the dust collector.

The metal filter cartridge is circular, and the filter cartridge is made of stainless steel flat-woven mat filter mesh with filter holes of 100-300 mesh.

The front end of the air inlet of the blowing pipe is equipped with a pulse valve, which controls the blowing rate of the air inlet.

The filter cartridge anode rows are located in the front row and the last row of each electric field, and each row of filter cartridges is on the same center line as the adjacent row of filter cartridges, and there is a drain between every two rows of filter cartridge anode rows. The number of electrode rows, the number of anode rows in the filter cartridge is equal to the number of discharge electrode rows+1.

Compared with the prior art, the utility model has the following remarkable features:

1. The utility model adopts the stainless steel filter cartridge as the dust collection pole, which not only plays the role of the pole plate, but also plays the role of the filter cartridge, and realizes the electrostatic and filtering dual-phase dust collection under the action of the electric field force and the airflow power, greatly improving It improves the dust collection speed and efficiency, realizes two-phase dust collection in the same space, saves twice the space compared with the electric bag combined dust collector, and its dust filtration speed is increased from 1m/min of the bag structure to 1m/s, and the collection speed is increased by 60 In addition, the resistance of the stainless steel wire mesh filter cartridge is doubled compared with that of the cloth bag, which also greatly reduces the system resistance of the electric filter composite dust collector ≤ 500Pa;

2. Charged coagulation is beneficial to the aggregation and recovery of fine dust, effectively improving the efficiency of dust removal and the recovery of fine dust. It can collect dust of more than 1u. The charged dust after polymerization is adsorbed on the metal wire surface of the stainless steel filter cartridge under the action of charged force, which is not easy to be carried away by the air flow and cause secondary dust pollution. It is also conducive to the absorption of fine dust and is not easy to generate dust. The loss of dust, thus ensuring the absorption of fine dust by the dust removal system (≤1u) and greatly improving the dust removal efficiency, which can meet the PM2.5 value emission requirements;

3. Metal (stainless steel wire mesh) filter cartridges (round, rectangular) are used to replace the anode plate of the electrostatic precipitator as the anode system of the electrostatic precipitator, which realizes electrostatic filtration two-phase dust collection in the same space, greatly improving the dust removal efficiency η ≥99.95%, stable emission in the range of working conditions ≤30mg/Nm ³ ; it will not generate secondary dust, and the system resistance is relatively low ≤500Pa. Due to the use of stainless steel wire mesh as the filter material, the life of the filter cartridge can be increased by more than 10 times. Generally up to 10 years;

4. The anode cleaning adopts the combined cleaning method of bottom side vibration and top pulse back blowing, so as to clean the dust more thoroughly and ensure the long-term stable operation of the dust collector;

5. Stainless steel wire filter has low resistance (≤500Pa), long service life (≥10 years), high temperature resistance (≤300°C), acid and alkali resistance and oxidation resistance are significantly better than cloth bags.

Table 1: Comparison of technical indicators between this utility model and other dust removal equipment

Description of drawings

Figure 1 is a schematic diagram of the structure of the electric filter dust collector.

Figure 2 is an enlarged schematic diagram of the layout of the metal filter cartridge.

In the figure: 1 air inlet, 2 discharge electrode row, 3 ash hopper, 4 air outlet, 5 shell, 6 blowing device, 7 filter cartridge, 8 vibrating device, 9 flower plate, 10 top beam, 11 transformer, 12 Rapper rod, 13 pulse valve.

Detailed ways

As shown in Figure 1, the electric filter compound dual-phase dust collector provided by the utility model includes: a plurality of electric fields arranged in sequence from the air inlet 1 to the air outlet 4 are arranged in the dust collector housing 5, and in the adjacent electric fields An electric field channel is set between them; an airflow distribution plate is arranged at the air inlet 1 in the middle of the dust collector, the air outlet 4 is arranged above the other side of the machine body, and each electric field at the bottom of the shell is equipped with an ash hopper 3; each electric field is composed of The discharge electrode row 2 composed of several cathode wires arranged in parallel and the dust collection anode row are composed of the discharge electrode row and the anode row in a staggered arrangement, and the discharge electrode row 2 is hung on the top beam 10 of the dust collector through the cathode hanging device; the discharge electrode row The row and the anode row are respectively connected with the high-voltage power supply of the transformer 11 to provide (V=72,000 volts to 100,000 volts) high-voltage static electricity for the electric field; The rapping mechanism is installed in the upper middle part of the dust collector.

As shown in Figure 2, the anode row described in the utility model is composed of several metal filter cartridges 7 arranged in parallel, and the metal filter cartridges are suspended on the top beam 10 in the dust collector housing 5 and arranged alternately with the discharge electrode row 2 , the filter cartridge anode rows are located in the front row and the last row of each electric field, each row of filter cartridges 7 is on the same center line as the adjacent row of filter cartridges 7, and there is an anode row between every two rows of filter cartridges 7 The discharge electrode row 2, the row number of the anode row of the filter cartridge is equal to the row number of the discharge electrode row 2+1. The metal filter cartridge 7 is designed to be circular, and the filter cartridge is made of a stainless steel flat-woven mat filter screen with a filter hole of 100-300 mesh; the stainless steel filter cartridge is correspondingly hung on the flower plate 9 in the dust collector housing 5 On the hole, the flower plate is fixed on the top beam 10 of the shell; a pulse valve 13 is installed at the front end of the air inlet of the spray pipe 6 on the top of the dust collector, and the pulse valve is used to control the speed of the air inlet injection, and the anode exhaust filter cartridge 7 The upper opening is connected with the blowing pipe 6 on the top of the dust collector, and the composite dust collection room is composed of the electric field and the filter cartridge 7, and the dust-laden gas passes through the filter cartridge 7 in the electric field through the air inlet 1 and the discharge electrode row 2 composed of the anode row and the cathode line , the charged dust is adsorbed on the mesh of the stainless steel wire mesh under the action of electric field force, airflow force and electrostatic force, and at the same time, the blowing pipe 6 above the dust collector is used to blow back the anode exhaust filter cartridge 7 below, so that the dust attached to the filter The dust on the outer surface of the cylinder 7 falls into the ash hopper 3 .

As shown in Figure 1, the rapping mechanism on the side of the anode row of the filter cartridge is set at the lower end of the dust collector, and the lower end of the side of the anode row is equipped with a rapping rod 12 connected to the stainless steel filter cartridge, corresponding to each filter cartridge. The rapping mechanism provided has a rapping shaft and a rapping rotary hammer driven by the rapping shaft, which periodically raps the anode row filter cartridges arranged with pole spacing; the rapping rod 12 corresponding to the position of the rapping hammer is fixed A rapping anvil is connected, so that the rapping force is transmitted from the anvil and the rapping rod to the stainless steel filter cartridge 7 forming the anode row. When the dust-containing gas enters the electric field from the air inlet 1, the dust ions are charged, and the charged dust moves on the surface of the anode of the filter cartridge under the joint action of the electric field force and the wind field force, and is adsorbed on the stainless steel under the action of electrostatic force. On the grid of the wire mesh, under the compound force of pulse back blowing and mechanical vibration, the collected dust falls off to the ash hopper, realizing the two-phase dust collection under the action of electric field force and airflow force. The secondary dust in the dust collection process will not be discharged into the clean air chamber due to the barrier of the filter screen, so as to complete the dust cleaning process without secondary dust.

Claims (6)

1. the compound two-phase deduster of section's electrofiltration, be included in shell of dust remover and be provided with from air inlet (1) to air outlet (4) several electric fields tactic, discharge electrode row (2) that each electric field is made up of the cathode line of some parallel arranged and the anode row that gathers dust form, discharge electrode row be staggered with anode row and be connected with the high voltage source of transformer (11) respectively, between adjacent electric field, electric field channel is set, in discharge electrode row side, the vibration body corresponding to cathode line is housed, the each electric field being positioned at housing bottom is laid with ash bucket (3), it is characterized in that: described anode row is made up of the metal filter cylinders (7) of some parallel arranged, card (9) the Kong Shangyu discharge electrode row that this metal filter cylinders is suspended in shell of dust remover (5) is accordingly staggered, card is fixed on housing back timber (10), combined type dust chamber is formed by electric field and metal filter cylinders (7), by the injection tube (6) being arranged on dust remover roof and being distributed with air holes, blowback is carried out to below filter cylinder anode row, make the dust being attached to metal filter cylinders (7) outer surface fall into ash bucket, the vibrating rod (12) connecting this metal filter cylinders is housed in the anode row side of arranging with die opening, carries out periodicity rapping by the vibration body with beater corresponded to set by each filter cylinder.

2. according to the compound two-phase deduster of electrofiltration according to claim 1, it is characterized in that: described is connected with anvil unit iron on the vibrating rod (12) corresponding to beater position, makes rapping power be passed to be formed on the metal filter cylinders of anode row by anvil iron, vibrating rod.

3. according to the compound two-phase deduster of the electrofiltration described in claim 1 or 2, it is characterized in that: described vibrating rod (12) and the vibration body containing beater are arranged on the bottom in deduster, the vibration body of discharge electrode row side is arranged on the upper middle part in deduster.

4. according to the compound two-phase deduster of electrofiltration according to claim 1, it is characterized in that: described metal filter cylinders is for circular, and this filter cylinder is that 100 ~ 300 order stainless steel plain weave seat type filter screens make by filter opening.

5. according to the compound two-phase deduster of electrofiltration according to claim 1, it is characterized in that: pulse valve (13) is equipped with in the air intake front end of described injection tube (6), control air intake injection rate by pulse valve.

6. according to the compound two-phase deduster of electrofiltration according to claim 1, it is characterized in that: described filter cylinder anode row is positioned at the front row of each electric field and finally arranges, between the filter cylinder (7) often arranging filter cylinder (7) and adjacent row all on same center line, be provided with discharge electrode row (2) between every two row's filter cylinder (7) anode rows, the row of filter cylinder anode row equals the row+1 of discharge electrode row (2).