CN207413074U - Coal-burning boiler electrostatic fabric filter - Google Patents

Abstract

The utility model discloses an electric bag dust collector for a coal-fired boiler, which comprises a shell. The shell is provided with an electric dust collector and a cloth bag dust collector in sequence along the air flow direction. , a clean air chamber is provided above the dust removal chamber, the clean air chamber is connected with an air outlet pipe, the air outlet pipe is connected with a dust removal pipe, and a fan is provided at the end of the dust removal pipe; a dust removal rod is arranged below the bag filter device, and the dust removal rod A vibrating motor is connected, and a linkage rope is provided between the cleaning rod and the bag filter device; the electrostatic precipitator includes electrode plates arranged parallel to the air intake direction, and a flow turbulence device is arranged between the electrode plates. The utility model has the characteristics of high dust removal efficiency and simple dust removal mechanism.

Description

Coal-fired boiler electric bag dust collector

technical field

The utility model relates to an electric bag composite dust collector, in particular to an electric bag dust collector for coal-fired boilers.

Background technique

With the improvement of environmental protection requirements, the flue gas treatment technology has also developed rapidly, among which electrostatic precipitator and bag filter are the more common two. For the flue gas emitted by the thermal power industry, due to the high specific resistance of the fly ash and some fine particles, the efficiency of the electrostatic precipitator has declined, while the bag type dust collector has limited ability to deal with large particles of soot, and the floor area is also small. larger. As a result, the electric bag composite dust collector came into operation.

The electric bag dust collector combines the advantages of the above two dust collectors. It firstly treats most of the dust particles in the flue gas through the electric field, and then filters the dust with high specific resistance and fine particles by the bag dust collector, so the dust removal effect is better. But the existing electric bag filter mainly contains two problems. One is that the dust removal efficiency of the electric field is low. The existing electric field plates are usually set perpendicular to the air intake direction, which causes the flue gas to hit the plate first after entering the dust collector, resulting in poor circulation; and those dust collectors whose electric field plates are parallel to the air intake direction will suffer due to The flue gas passes through the electric field between the plates too quickly, and some large particles of smoke have no time to absorb. Another problem is that the dust removal mechanism of the dust collector is relatively complicated. The existing dust cleaning methods of the electric bag filter mainly include pulse injection and mechanical vibration. The mechanisms of these two methods are relatively complicated, and for some filter bags made of materials with poor bending resistance, vibration and dust removal will also cause damage to the bag. To sum up, the existing electrostatic bag filter has the problems of low dust removal efficiency and complex dust removal mechanism.

Utility model content

The purpose of the utility model is to provide an electric bag filter for a coal-fired boiler. The utility model has the characteristics of high dust removal efficiency and simple dust removal mechanism.

The technical scheme of the utility model: the coal-fired boiler electric bag dust collector includes a shell, one end of the shell is provided with an air inlet, the air inlet is provided with a first air distribution plate, and the shell is sequentially arranged along the air flow direction. Electrostatic precipitator and bag filter, there is a second air flow distribution plate between the electrostatic precipitator and bag filter, the bag filter includes multiple dust removal chambers, dust removal chambers are equipped with bag filter devices, and a clean air chamber is arranged above the dust removal chambers , the clean air chamber is provided with a lift valve, the clean air chamber is connected with an air outlet pipeline through the lift valve, one end of the air outlet pipeline is provided with a first dust removal valve, the other end of the air outlet pipeline is connected with a dust removal pipeline, the connection between the air outlet pipeline and the dust removal pipeline There is a second cleaning valve in between, and a fan is installed at the end of the cleaning pipeline; a cleaning rod is provided under the bag filter device, and a vibration motor is connected to the cleaning rod, and there is a linkage between the cleaning rod and the bag filter device. rope; the electrostatic precipitator includes electrode plates arranged parallel to the air intake direction, and a flow turbulence device is arranged between the electrode plates; the lower end of the electrostatic precipitator and the bag filter is provided with an ash hopper.

In the aforementioned coal-fired boiler electric bag dust collector, there are multiple nozzles above the electric dust collector, the nozzles are connected to the dust removal pipeline through the auxiliary pipe, and the nozzles are provided with corresponding nozzle valves.

In the aforementioned coal-fired boiler electric bag filter, the sum of the windward areas of the set of windward curved plates and upwind curved plates is less than 1/3 of the electrode plate interval width.

Compared with the prior art, the pole plates of the electrostatic precipitator in the utility model are parallel to the air intake direction, and a flow turbulence device consisting of windward curved plates is provided between the pole plates. The polar plate is parallel to the air intake direction so that the flue gas can smoothly flow through the electric field between the plates and be dust-removed, and the turbulence device prevents the flue gas from passing through the electric field too quickly, so that the electric field can fully absorb large particles of dust in the flue gas. The utility model combines dust removal through two methods of dust removal rod and blower fan. The dust-cleaning rod that can reciprocate and vibrate drives the bag filter device to shake through the tight linkage rope, so that the dust attached to the bag filter device falls off. At the same time, the blower blows reversely to the bag filter device through the air outlet pipe and the clean air chamber. The above-mentioned dust-cleaning mechanism is not only simple in structure but also has good dust-cleaning effect.

Furthermore, a nozzle connected to a fan is provided above the electrostatic precipitator. The principle of general electrostatic precipitator dust removal is as follows. The plates of the electrostatic precipitator are all vertically set, and the dust will fall into the ash hopper by gravity after the power is turned off. And the nozzle added in the utility model can effectively improve the cleaning effect of the electrostatic precipitator through the airflow.

Therefore, the utility model has the characteristics of high dust removal efficiency and simple dust removal mechanism.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a top view schematic diagram of the electrostatic precipitator;

Fig. 3 is the structural representation of spoiler;

Fig. 4 is a schematic structural diagram of the first air distribution plate.

Reference signs:

10-housing, 11-air inlet, 12-first air distribution plate, 13-second air distribution plate, 20-electric precipitator, 21-electrode plate, 30-bag filter, 31-dust removal room, 32 -Bag filter device, 40-cleaning chamber, 41-lift valve, 50-outlet pipe, 51-first cleaning valve, 52-second cleaning valve, 60-cleaning pipeline, 61-fan, 62-pair Pipe, 63-nozzle, 64-nozzle valve, 70-cleaning rod, 71-vibration motor, 72-linkage rope, 80-ash hopper, 90-disturbance device, 91-windward curved plate, 92-upwind curved plate.

Detailed ways

The utility model will be further described below in conjunction with the examples, but not as the basis for limiting the utility model.

Embodiment: The coal-fired boiler electric bag dust collector is composed as shown in Figures 1 to 4, including a housing 10, one end of the housing 10 is provided with an air inlet 11, and a first air distribution plate is provided at the air inlet 11 12. The shell 10 is provided with an electrostatic precipitator 20 and a bag filter 30 sequentially along the direction of air flow. A second air distribution plate 13 is provided between the electrostatic precipitator 20 and the bag filter 30. The bag filter 30 includes multiple Dust removal chamber 31, dust removal chamber 31 is provided with bag filter device 32, is provided with clean gas chamber 40 above dust removal chamber 31, and clean gas chamber 40 is provided with lift valve 41, and clean gas chamber 40 is connected with outlet pipeline 50 through lift valve 41, One end of the air outlet pipeline 50 is provided with a first dust removal valve 51, and the other end of the air outlet pipeline 50 is connected with a dust removal pipeline 60. A second dust removal valve 52 is arranged between the air outlet pipeline 50 and the dust removal pipeline 60, and the dust removal pipeline 60 The end is provided with a blower fan 61; the dust removal rod 70 is provided below the bag filter device 32, and the dust removal rod 70 is connected with a vibration motor 71, and a linkage rope 72 is provided between the dust removal rod 70 and the bag filter device 32; The electrostatic precipitator 20 includes electrode plates 21 arranged parallel to the air intake direction, and a flow turbulence device 90 is provided between the electrode plates 21 ; an ash hopper 80 is provided at the lower ends of the electric precipitator 20 and the bag filter 30 .

A plurality of nozzles 63 are arranged above the electrostatic precipitator 20 , and the nozzles 63 are connected to the dust removal pipeline 60 through the auxiliary pipe 62 , and the corresponding nozzle valves 64 are arranged on the nozzles 63 .

The flow turbulence device 90 includes a windward curved plate 91 , and an upwind curved plate 92 is provided at both ends of the windward curved plate 91 .

The sum of the windward areas of the set of windward curved plates 91 and upwind curved plates 92 is less than 1/3 of the spacing width of the electrode plates 21 . If the windward area of the turbulence device 90 is too large, the dust removal efficiency will be reduced instead, so corresponding restrictions need to be made.

Working principle: when purifying the flue gas, the flue gas enters the air inlet 11 and passes through the first air distribution plate 12 (as shown in Figure 4, the air flow distribution plate is a plate with evenly distributed holes. The flue gas flows through different Can produce turbulence during the pipeline of diameter, and the airflow distribution is uneven.The effect of airflow distribution plate is to balance airflow distribution, prevents that the airflow distribution of flue gas causes dust removal efficiency to drop) enters electrostatic precipitator 20, in the turbulence device 90 Under the action, the flue gas will pass through the electric field between the electrode plates 21 smoothly but not too quickly, and the large particles of dust in the flue gas will be adsorbed on the electrode plates 21 . Then the flue gas passes through the second airflow distribution plate 13 and enters each dust removal chamber 31 of the bag filter 30 . The poppet valve 41 is a special equipment commonly used in the bag filter, and it is generally a cylinder poppet valve, which is mainly used for the diversion of the airflow. The poppet valve 41 guides the gas in the clean gas chamber 40 into the gas outlet pipe 50, so a negative pressure is formed in the clean gas chamber 40 and the dust removal chamber 31, and the flue gas passes through the bag filter device 32 and enters the clean gas chamber and flows to the gas outlet pipe 50. The fine particle in is filtered by bag filter device 32.

When purging, the first soot removal valve 51 is opened, and the second soot removal valve 52 and the nozzle valve 64 are closed. During dust removal, the first dust removal valve 51 is closed, the second dust removal valve 52 and the nozzle valve 64 are opened, and the electrostatic precipitator 20 is in a power-off state. Simultaneously, the vibrating motor 71 drives the dust removal rod 70 to vibrate back and forth, and the dust removal rod 70 drives the bag filter device 32 to shake by the tensioned linkage rope 72 . In this way, the dust on the electrostatic precipitator 20 and the bag filter 30 falls into the ash hopper 80 .

Simultaneously, the fan 61 blows air into the dust removal pipeline 60 . This air is blown to the bag filter device 32 through the air outlet pipe 50 and the clean air chamber 40 on the one hand to blow off the dust on the bag; on the other hand it is blown to the electrode plate 21 through the secondary pipe 32 and the nozzle 63, which also contributes to Clean up.

Claims (4)

1. coal-burning boiler electrostatic fabric filter, it is characterised in that：Including housing (10), one end of housing (10) is equipped with air inlet (11), the first airflow-distribution board (12) is equipped at air inlet (11), housing (10) is interior to be equipped with electric precipitation successively along airflow direction Device (20) and bag filter (30) are equipped with the second airflow-distribution board between electric precipitator (20) and bag filter (30) (13), bag filter (30) includes multiple dirt pockets (31), and Bag filter device (32), dirt pocket are equipped in dirt pocket (31) (31) top is equipped with air-purifying chamber (40), and air-purifying chamber (40) is equipped with poppet (41), and air-purifying chamber (40) boosted valve (41) is connected with Outlet pipe (50), one end of outlet pipe (50) are equipped with the first soot cleaning valve (51), and the other end of outlet pipe (50) is connected with Deashing pipeline (60) is equipped with the second soot cleaning valve (52), deashing pipeline (60) end between outlet pipe (50) and deashing pipeline (60) End is equipped with wind turbine (61)；Deashing bar (70) is equipped with below the Bag filter device (32), deashing bar (70) is connected with vibration Motor (71) is equipped with linkage rope (72) between deashing bar (70) and Bag filter device (32)；Electric precipitator (20) bag The electrode plate (21) being arranged in parallel with airintake direction is included, disturbing flow device (90) is equipped between electrode plate (21)；The electric precipitation Device (20) and bag filter (30) lower end are equipped with ash bucket (80).

2. coal-burning boiler electrostatic fabric filter according to claim 1, it is characterised in that：Above the electric precipitator (20) Equipped with multiple nozzles (63), nozzle (63) is connected through looped pipeline (62) with deashing pipeline (60), and nozzle (63) is equipped with corresponding Nozzle valve (64).

3. coal-burning boiler electrostatic fabric filter according to claim 1, it is characterised in that：Disturbing flow device (90) bag It includes, windward bent plate (91), bent plate (91) both ends are equipped with contrary wind bent plate (92) windward.

4. coal-burning boiler electrostatic fabric filter according to claim 3, it is characterised in that：Bent plate (91) windward of described one group It is less than 1/3 electrode plate (21) interval width with the front face area summation of contrary wind bent plate (92).