Multipurpose ash removal device for low-temperature economizer

Abstract

The utility model relates to a multi-purpose ash removal device for a low-temperature economizer. The multi-purpose ash removal device comprises a flue and an ash blower, a low-temperature economizer module is arranged in the flue, and a heat exchange pipe is arranged on the opposite surface of the low-temperature economizer module; a plurality of soot blowers are arranged among the low-temperature economizer modules; the soot blower comprises a main pipe and a branch pipe, and the main pipe is connected with a water tank and a compressed air storage tank; the main pipe extends into the flue through the driving motor, and the branch pipes are connected to the two sides of the main pipe. The branch pipe is provided with a plurality of nozzles, and the ends of the nozzles face the heat exchange pipe. The soot blower has the beneficial effects that the soot blower is driven by the motor and enters the flue along the guide rail, and the guide rail limits the movement direction of the soot blower, so that the spraying range of each nozzle can be better planned, and full-coverage and dead-corner-free accumulated soot cleaning can be realized; the problems of heat exchange tube blowing damage and cleaning of accumulated dust on the surface of the heat exchange tube after short-time shutdown are solved; and the motor drives the soot blower to move back and forth, so that accumulated soot can be cleaned more thoroughly, and full-coverage and dead-corner-free accumulated soot cleaning is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of thermal power technology, especially including a multipurpose ash removal device for low-temperature economizer. BACKGROUND

[0002] At present, the low-temperature economizer of the thermal power plant generally has the problem of ash deposition, and the serious ash deposition not only affects the heat exchange effect, but also causes the resistance of the smoke system to increase, brings the risk of stall to the induced draft fan, and causes the present load of the unit.

[0003] The flue gas generated by coal combustion contains fly ash particles, and these particles are mainly the ash after coal combustion, including silicon, aluminum, calcium and other oxides. In the low-temperature economizer area, the flue gas temperature is low, which may cause the components such as sulfates in the ash to condense on the heating surface, form a viscous layer, more easily adsorb fly ash, and gradually accumulate into ash scale.

[0004] The traditional steam soot blower will blow the heat exchange tube, and the traditional soot blowing device cannot clean the heat exchange tube during the short-term shutdown of the unit, and cannot guarantee the dryness and cleanliness of the surface of the heat exchange tube and 100% coverage and dead angle cleaning.

[0005] Therefore, it is urgent to invent a multipurpose ash removal device capable of full-coverage ash removal during the operation of the low-temperature economizer and dead-angle offline cleaning during the short-term shutdown. INVENTION CONTENTS

[0006] The utility model aims at overcoming the defects in the prior art, and provides a multipurpose ash removal device for low-temperature economizer.

[0007] The multipurpose ash removal device for low-temperature economizer comprises a flue and a soot blower; a low-temperature economizer module is arranged in the flue, and the low-temperature economizer module is provided with heat exchange tubes on opposite surfaces; a plurality of soot blowers are arranged between the low-temperature economizer modules; the soot blower comprises a main pipe and a branch pipe, the main pipe is connected with a water tank and a compressed air storage tank; the main pipe extends into the flue through a driving motor, and the branch pipe is connected to both sides of the main pipe; the branch pipe is provided with a plurality of nozzles, and the nozzles are arranged to face the heat exchange tubes.

[0008] Preferably, one end of the water tank is connected with a valve, and the other end is connected with a booster pump; the other end of the valve is connected with process water and plant drainage, the process water is cold water, and the plant drainage is hot water; the other end of the booster pump is connected with a valve, and the other end of the valve is connected with the main pipe.

[0009] Preferably, the compressed air storage tank is connected with a valve at both ends, and the valve is connected with the main pipe.

[0010] Preferably, a driving motor is arranged outside the flue, and the driving motor is connected with the main pipe.

[0011] As preferred, guide rails are arranged between the low-temperature economizer modules, and sliding blocks are slidingly connected to the guide rails, and the sliding blocks are connected to both ends of the branch pipes.

[0012] As preferred, the branch pipes are vertically connected to both ends of the main pipe and are parallel to the heat exchange pipes; and the nozzle ends are parallel to the heat exchange pipes.

[0013] As preferred, a plurality of soot blowers are evenly arranged in the flue, branch pipes are evenly arranged on both sides of the main pipe, and nozzles are evenly arranged on the side walls of the branch pipes.

[0014] As preferred, the main pipe and the branch pipes are hollow structures.

[0015] The utility model has the advantages of:

[0016] 1) The soot blower is driven by a motor, enters the flue along the guide rail, and the guide rail limits the movement direction of the soot blower, which is beneficial to better planning the spraying range of each nozzle to achieve full coverage and dead angle-free soot cleaning.

[0017] 2) The soot blower uses compressed air to blow the surface of the heat exchange pipe when the unit is running, uses hot water and cold water to clean the soot after the unit is temporarily stopped, and then uses compressed air to blow and dry the surface of the heat exchange pipe, thereby solving the problems of heat exchange pipe blowout and soot cleaning after temporary shutdown.

[0018] 3) The motor drives the soot blower to move forward and backward, which is beneficial to more complete soot cleaning and achieves full coverage and dead angle-free soot cleaning. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of a multipurpose soot cleaning device;

[0020] Figure 2 is a schematic view of a flue structure;

[0021] Figure 3 is a schematic view of the soot blower in operation.

[0022] BRIEF DESCRIPTION OF DRAWINGS: driving motor 1, main pipe 2, flue 3, low-temperature economizer module 4, guide rail 5, sliding block 6, nozzle 7, branch pipe 8, booster pump 9, valve 10, soot blower 11. DETAILED DESCRIPTION

[0023] The utility model will be further described below in combination with examples. The following examples are only used to help understand the utility model. It should be pointed out that for ordinary people in the technical field, without departing from the principle of the utility model, the utility model can be modified, and these improvements and modifications also fall within the protection scope of the utility model claims.

[0024] As an embodiment, a multi-purpose soot cleaning device for low-temperature economizer is provided, which comprises a flue 3 and a soot blower 11; the low-temperature economizer module 4 is arranged in the flue 3, and the low-temperature economizer module 4 is provided with heat exchange pipes on opposite sides; a plurality of soot blowers 11 are arranged between the low-temperature economizer modules 4; the soot blower comprises a main pipe 2 and a branch pipe 8, and the main pipe 2 is connected with a water tank and a compressed air storage tank; the main pipe 2 is extended into the flue 3 through a driving motor 1, and the branch pipe 8 is connected to the two sides of the main pipe 2; the branch pipe 8 is provided with a plurality of nozzles 7, and the nozzles 7 are arranged to face the heat exchange pipes.

[0025] The water tank is provided with two connection ports, one side of which is connected with process water and power plant drainage through a valve 10, and the other side is connected with the main pipe 2 through a booster pump 9 and a valve 10 in series.

[0026] The compressed air storage tank is connected with two valves 10 at two ends, one of which is connected with the main pipe 2, and the other is connected with a gas supply device.

[0027] The driving motor 1 is arranged outside the flue 3 and connected with the main pipe 2, and drives the soot blower to move back and forth, which is conducive to more complete cleaning of the accumulated ash and realizes full coverage and dead angle-free cleaning of the accumulated ash.

[0028] The low-temperature economizer module 4 is provided with a guide rail 5, the guide rail 5 is slidably connected with a sliding block 6, and the sliding block 6 is connected with the two ends of the branch pipe 8.

[0029] The branch pipe 8 is vertically connected to the two ends of the main pipe 2 and parallel to the heat exchange pipes; the nozzles 7 are parallel to the heat exchange pipes.

[0030] The flue is provided with a plurality of soot blowers 11, the two sides of the main pipe 2 are provided with branch pipes 8, the side walls of the branch pipes 8 are provided with nozzles 7, and the nozzles 7 are evenly distributed in the flue 3, which realizes full coverage and dead angle-free cleaning of the accumulated ash.

[0031] The main pipe 2 and the branch pipe 8 are hollow structures for transporting water and gas to the nozzles 7 to realize cleaning of the accumulated ash on the heat exchange pipes on both sides of the low-temperature economizer module 4.

[0032] A working method of a multi-purpose soot cleaning device for low-temperature economizer, comprising the following steps:

[0033] Step one, check the equipment: check whether the driving motor 1 runs stably, and whether the pipelines of the main pipe 2, the nozzles 7 and the branch pipe 8 are unobstructed;

[0034] Step two, turn on the driving motor 1 to drive the main pipe 2 to move back and forth;

[0035] Step three, open the valve 10 of the compressed air storage tank, and the nozzles 7 spray compressed gas towards the heat exchange pipes to preliminarily clean the accumulated ash;

[0036] Step four, close the valve 10 of compressed air storage tank, short-term shutdown unit, open the valve 10 of water tank both sides, respectively using hot water and cold water to complete the cleaning of dust, then close the valve 10 of water tank both sides, open the valve 10 of compressed air storage tank, the main pipe 2 into compressed air, the surface of heat exchange tube is purged and dried;

[0037] Step five, close the drive motor 1 and each valve 10, check whether the dust is clean.

[0038] In step four, the nozzle 7 faces the heat exchange tube, and the ejected gas will preliminarily clean the dust with the reciprocating movement of the drive motor 1; the dust on the surface of the heat exchange tube is basically caused by ammonium bisulfate, which is easily dissolved in water, and hot water flushing effect is better, so 80-90℃ hot water from power plant is used to flush the surface of the heat exchange tube through the booster pump.

Claims

1. A multi-purpose ash cleaning device for use in a low-temperature economizer, characterized by, The utility model relates to a low-temperature economizer module and a soot blower for a flue, and belongs to the field of energy saving and emission reduction. The flue and the soot blower are included; the low-temperature economizer module is arranged in the flue; the low-temperature economizer module is provided with heat exchange pipes on opposite sides; a plurality of soot blowers are arranged between the low-temperature economizer modules; the soot blower includes a main pipe and branch pipes; the main pipe is connected with a water tank and a compressed air storage tank; the main pipe is extended into the flue through a driving motor; the branch pipes are connected to the two sides of the main pipe; the branch pipes are provided with a plurality of nozzles; the nozzles are directed towards the heat exchange pipes.

2. The low-temperature economizer of claim 1, wherein the multi-purpose ash cleaning device is characterized by, One end of the water tank is connected with a valve; the other end is connected with a booster pump; the other end of the valve is connected with process water and power plant drainage; the process water is cold water; the power plant drainage is hot water; the other end of the booster pump is connected with a valve; the other end of the valve is connected with the main pipe.

3. The low-temperature economizer of claim 1, wherein the multi-purpose ash cleaning device is characterized by, The compressed air storage tank is connected with valves at both ends; the valves are connected with the main pipe.

4. The multi-purpose ash cleaning device for use in a cryogenic economizer according to claim 1, characterized in that, The driving motor is arranged outside the flue; the driving motor is connected with the main pipe.

5. The multi-purpose ash cleaning device for use in a cryogenic economizer according to claim 1, characterized in that, A guide rail is arranged between the low-temperature economizer modules; the guide rail is slidingly connected with a sliding block; the sliding block is connected with the two ends of the branch pipe.

6. The multi-purpose ash cleaning device for use in a cryogenic economizer according to claim 1, wherein The branch pipes are vertically connected to the two ends of the main pipe; the branch pipes are parallel to the heat exchange pipes; the nozzles are parallel to the heat exchange pipes.

7. The low-temperature economizer of claim 1, wherein the multi-purpose ash cleaning device is characterized by, The flue is uniformly provided with a plurality of soot blowers; the two sides of the main pipe are uniformly provided with branch pipes; the side walls of the branch pipes are uniformly provided with nozzles.

8. The multi-purpose ash cleaning device for use in a cryogenic economizer according to claim 1, characterized in that, The main pipe and the branch pipes are hollow structures.

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