Insulator purging system of electric dust remover

Abstract

The utility model discloses an insulator purging system of an electric dust remover, which comprises a box body, a first air outlet pipe, a second air outlet pipe, a fan and a return pipe, and the second air outlet pipe is communicated with an air inlet pipe through the return pipe; the box body is arranged in a flue gas flowing channel in the electric dust remover, and the box body is communicated with outside air through an air inlet pipe; the box body is communicated with an air inlet of a fan through a first air outlet pipe, and an air outlet of the fan is communicated with a cathode insulation box in the electric dust remover through a second air outlet pipe. According to the insulator purging system of the electric dust remover, the problems of high electric heating power and high energy consumption of the conventional electric heating purging system at present are solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of electric dust collector, specifically relates to a kind of electric dust collector insulator purging system. BACKGROUND

[0002] In order to deal with non-ferrous smelting furnace discharged high temperature flue gas, waste heat boiler is generally configured at its flue gas outlet for recovering heat in flue gas, so that flue gas temperature is reduced to about 380 DEG C. After heat exchange, flue gas enters into electric dust collector for dust removal treatment from waste heat boiler outlet, and then flue gas is introduced into flue gas surface cooler for further cooling. Electric dust collector separates dust in flue gas by using high-voltage electric field in it, and electric dust collector is mainly composed of anode system and cathode system. Among them, cathode system contains cathode line, insulator, cathode hanging system and the like, and insulator is installed in cathode insulation box. When electric dust collector operates, cathode insulation box is in communication with flue gas in electric dust collector smoke chamber, and dust in flue gas is easy to diffuse to cathode insulation box and accumulate on cathode porcelain shaft in cathode insulation box, so that surface insulation is invalid, and creepage on insulator surface is formed, thereby leading to low secondary voltage of electric dust collector, affecting dust collection efficiency, and seriously, electric field trips, and equipment cannot operate.

[0003] In order to solve the problems such as creepage on insulator surface, existing technology generally adopts top blowing or side blowing mode to heat and blow dust and water vapor on insulator (insulating porcelain basin, cathode porcelain shaft) in cathode insulation box, keeps that gas pressure in cathode insulation box is greater than flue gas pressure in electric dust collector, guarantees that hot air continuously flows from cathode insulation box to electric dust collector smoke chamber, and prevents dust from diffusing to cathode insulation box. At present, conventional hot air purging system all adopts electric heating air to output hot air, and there are the defects of high electric heating power, high energy consumption and high operation cost. UTILITY MODEL CONTENTS

[0004] In view of the existing technical problems, the utility model aims at providing an electric dust collector insulator purging system, which can solve the problems of high electric consumption and high operation cost of conventional hot air purging system.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows:

[0006] An electric dust collector insulator purging system has the structural characteristics that it comprises a box body, a first air outlet pipe, a second air outlet pipe, a fan and a backflow pipe, the second air outlet pipe is communicated with the air inlet pipe through the backflow pipe, the box body is arranged in the flue gas flow channel in the electric dust collector, and the box body is communicated with external air through the air inlet pipe, the box body is communicated with the air inlet of the fan through the first air outlet pipe, and the air outlet of the fan is communicated with the cathode insulation box in the electric dust collector through the second air outlet pipe.

[0007] The application discloses an electric dust collector insulation sub blowing system.

[0008] Preferably, the backflow pipe is provided with a backflow valve.

[0009] In order to control the air flow entering the box, preferably, the air inlet pipe is provided with a second valve, which is arranged outside the connection point of the backflow pipe and the air inlet pipe, and the outer end of the air inlet pipe is communicated with external air.

[0010] Specifically, the second air outlet pipe is provided with a temperature sensor and / or a pressure sensor.

[0011] Preferably, the second valve is electrically connected with the temperature sensor on the second air outlet pipe, the backflow valve is electrically connected with the pressure sensor on the second air outlet pipe, and the second valve and the backflow valve are both electrically connected with a PLC controller. The second valve and the temperature sensor are interlocked, the backflow valve and the pressure sensor are interlocked, and the second valve and the backflow valve are automatically adjusted through the PLC controller, so that the temperature and pressure at the outlet of the fan are ensured to be within a set range.

[0012] Preferably, the electric dust collector is provided with a plurality of cathode insulation boxes, and the end of the second air outlet pipe is provided with a plurality of parallel branch pipes, which are in one-to-one correspondence with the cathode insulation boxes, and each branch pipe is communicated with a corresponding cathode insulation box.

[0013] Specifically, the first valve is arranged on each of the branch pipes. By arranging the first valve, the air quantity entering each cathode insulation box can be controlled.

[0014] Preferably, the box is provided with a rapping device, and the driving device of the rapping device is arranged in external air. Through the timed rapping of the rapping device, the dust on the surface of the box can be removed, and the heat exchange efficiency of the box can be ensured.

[0015] Preferably, the electric dust collector is connected with a flue gas surface cooler, and the box is arranged in the outlet flue of the electric dust collector or the front-end gas chamber of the flue gas surface cooler.

[0016] Preferably, the box and the air pipes of the whole system are both provided with an insulation layer.

[0017] Compared with the prior art, the electric dust collector insulator purging system has the following beneficial effects:

[0018] 1. The electric dust collector insulator purging system fully utilizes the heat of flue gas, replaces electric heating, circulates hot air in the system, and greatly reduces the installed power and operation cost of the electric dust removal system.

[0019] 2. The electric dust collector insulator purging system, by setting the rapping device dust removal guarantee box heat exchange efficiency, the artificial maintenance workload is small.

[0020] 3. The electric dust collector insulator purging system, by the PLC controller automatically adjusts the hot air temperature and pressure in the preset range operation, without manual operation, can adapt to the working condition fluctuation of high temperature furnace. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is the electric dust collector insulator purging system structure schematic view of the utility model.

[0022] In the drawings

[0023] 1-box, 2-first air outlet pipe, 3-second air outlet pipe, 301-branch pipeline, 4-rapping device, 5-fan, 6-temperature sensor, 7-pressure sensor, 8-first valve, 9-backflow valve, 10-backflow pipe, 11-second valve, 12-thermal insulation layer, 13-PLC controller, 14-flue gas table cooler, 15-air inlet pipe, 16-cathode insulation box. DETAILED DESCRIPTION

[0024] The utility model will be described in detail below with reference to the drawings and in combination with embodiments. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict. For the sake of description, if "up", "down", "left", "right" appear in the following text, it only means consistent with the up, down, left and right directions of the drawings themselves, and does not limit the structure.

[0025] For example Figure 1As shown, the electric dust collector insulator purging system of the embodiment comprises a box 1 and a fan 5, the fan 5 is a high-temperature fan, and the box 1 is arranged in the front-end air chamber of a flue gas surface cooler 14. The box 1 is provided with a rapping device 4, and the driving device of the rapping device 4 is in the external air. The box 1 is provided with an air inlet pipe 15 and a first air outlet pipe 2, the external end of the air inlet pipe 15 is connected with the external air, and the air inlet pipe 15 is provided with a second valve 11, the second valve 11 is an electric cold air valve. The air inlet of the fan 5 is connected with the first air outlet pipe 2, the air outlet of the fan 5 is connected with a second air outlet pipe 3, and the second air outlet pipe 3 is provided with a temperature sensor 6 and a pressure sensor 7. The end of the second air outlet pipe 3 is provided with five parallel branch pipes 301, the branch pipes 301 are respectively corresponding to five cathode insulator boxes 16, the branch pipes 301 are respectively connected with the corresponding cathode insulator boxes 16, and the connecting pipes are provided with a first valve 8, the first valve 8 is a manual air valve. The second air outlet pipe 3 and the air inlet pipe 15 are connected through a backflow pipe 10, the backflow pipe 10 is arranged in parallel with the branch pipes 301, and the second valve 11 is arranged outside the connection point of the backflow pipe 10 and the air inlet pipe 15. The backflow pipe 10 is provided with a backflow valve 9, the backflow valve 9 is an electric backflow valve. The second valve 11 is electrically connected with the temperature sensor 6, the backflow valve 9 is electrically connected with the pressure sensor 7, and the rapping device 4, the second valve 11 and the backflow valve 9 are electrically connected with a PLC controller 13. The external surfaces of the box 1, the first air outlet pipe 2, the second air outlet pipe 3, the five branch pipes 301, the backflow pipe 10 and the air inlet pipe 15 are all provided with a heat preservation layer 12.

[0026] When the electric dust collector insulator purging system works, under the action of the fan 5, the external air is introduced into the box 1 to exchange heat with the hot flue gas, and the air in the box 1 is heated to 150-200℃. The high-temperature air purges the insulators in the cathode insulator boxes 16 through the first air outlet pipe 2, the fan 5, the second air outlet pipe 3 and the branch pipes 301, and the remaining hot air returns to the box 1 through the backflow pipe 10. The size of the air volume in each cathode insulator box 16 is controlled by setting the size of the first valve 8. The second valve 11 is interlocked with the temperature sensor 6, and the backflow valve 9 is interlocked with the pressure sensor 7. The automatic adjustment of the second valve 11 and the backflow valve 9 is realized through the PLC controller 13, so as to ensure that the outlet temperature and pressure of the fan 5 are within the set range. The surface dust of the box 1 can be removed through the timed rapping of the rapping device 4, so as to ensure the heat exchange efficiency of the box 1, and the interval time of the rapping device 4 for removing dust can be set on the PLC controller 13.

[0027] The content illustrated in the above embodiment should be understood as that the embodiment is only used for more clearly illustrating the utility model, and is not used for limiting the range of the utility model. After reading the utility model, the modification of various equivalent forms of the embodiment made by the person skilled in the art all falls within the range defined by the appended claims of the utility model.

Claims

1. An electric precipitator insulator purging system characterized by: The application relates to an air supply device for an electric dust collector, which comprises a box (1), a first air outlet pipe (2), a second air outlet pipe (3), a fan (5) and a backflow pipe (10), the second air outlet pipe (3) is communicated with an air inlet pipe (15) through the backflow pipe (10); the box (1) is arranged in a flue gas flow channel in the electric dust collector, and the box (1) is communicated with external air through the air inlet pipe (15); The box (1) is communicated with an air inlet of the fan (5) through the first air outlet pipe (2), and an air outlet of the fan (5) is communicated with a cathode insulation box (16) in the electric dust collector through the second air outlet pipe (3).

2. The electric precipitator insulator purging system of claim 1, wherein: A backflow valve (9) is arranged on the backflow pipe (10).

3. The electric precipitator insulator purging system of claim 2, wherein: A second valve (11) is arranged on the air inlet pipe (15), the second valve (11) is arranged on the outer side of a connecting point of the backflow pipe (10) and the air inlet pipe (15), and an outer end of the air inlet pipe (15) is communicated with external air.

4. The electric precipitator insulator purging system of claim 3, wherein: A temperature sensor (6) and / or a pressure sensor (7) are arranged on the second air outlet pipe (3).

5. The electric precipitator insulator purging system of claim 4, wherein: The second valve (11) is electrically connected with the temperature sensor (6) on the second air outlet pipe (3), the backflow valve (9) is electrically connected with the pressure sensor (7) on the second air outlet pipe (3), and the second valve (11) and the backflow valve (9) are electrically connected with a PLC controller (13).

6. The electric precipitator insulator purging system of claim 1, wherein: A plurality of cathode insulation boxes (16) are arranged in the electric dust collector, the end of the second air outlet pipe (3) is provided with a plurality of parallel branch pipes (301), the branch pipes (301) are in one-to-one correspondence with the cathode insulation boxes (16), and the branch pipes (301) are respectively communicated with the corresponding cathode insulation boxes (16).

7. The electric precipitator insulator purging system of claim 6, wherein: First valves (8) are arranged on the branch pipes (301).

8. The electric precipitator insulator purging system of any one of claims 1-7, wherein: A rapping device (4) is arranged on the box (1), and a driving device of the rapping device (4) is arranged in external air.

9. The electric precipitator insulator purging system of any one of claims 1-7, wherein: The electric dust collector is connected with a flue gas surface cooler (14), and the box (1) is arranged in an outlet flue of the electric dust collector or a front-end air chamber of the flue gas surface cooler (14).

10. The electric precipitator insulator purging system of any one of claims 1-7, wherein: The box (1) and the air pipes of the whole system are provided with heat preservation layers (12) on the outer sides.

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