CN216448691U - Disassembly-and-assembly-free descaling and derusting system of air preheater - Google Patents

Abstract

The utility model relates to a disassembly-and-assembly-free descaling and rust removing system of an air preheater. The device comprises a vehicle, wherein an air compressor, a powder recovery device, a washing and descaling device, an abrasive circulating supply device and a collection device are arranged in a vehicle hopper, and a plurality of abrasive spray guns and a plurality of high-pressure water guns are also arranged; the powder recovery device comprises a recovery support, a filter bag assembly is arranged in the middle of an inner cavity of a recovery box body, a collecting hopper is arranged at the bottom of the inner cavity, and an exhaust fan is arranged at the top of the inner cavity; the flushing descaling device comprises a box body, a flushing clapboard is arranged in an inner cavity, a rough filtering component is arranged in a cavity at the front part, and a stirring component, a fine filtering component, an injection component and a pressurization output component are arranged at the top of the cavity at the rear part; the abrasive material circulating supply device comprises an outer cylinder, a discharging conical cylinder is arranged at the middle upper part of an inner cavity of the outer cylinder, an inner cylinder with a filter plate is arranged above the discharging conical cylinder, and a distributor is arranged at the bottom of a conical bottom. The utility model has reasonable structural design, can be transferred and moved in different occasions and has high operation efficiency.

Description

Disassembly-and-assembly-free descaling and derusting system of air preheater

Technical Field

The utility model belongs to the technical field of industrial cleaning, and particularly relates to a disassembly-and-assembly-free descaling and rust removing system of an air preheater.

Background

The air preheater is an air preheater, is widely applied to the power generation industry, and is a regenerative heat exchanger which runs in a countercurrent mode. When the flue gas flows through the rotor, the flue gas releases heat to the heat storage element, and the temperature of the flue gas is reduced; when the heat storage element is rotated to the air side, heat is released again to the air, and the air temperature rises. The circulation is repeated in this way, and the heat exchange between the smoke and the air is realized. The air preheater has the problem of blockage after running for a certain time, which causes the problems of high boiler exhaust gas temperature, increased smoke and wind resistance, increased energy consumption and the like. Because the clearance of the heat accumulation sheets of the air preheater is small, the ash and scale are condensed together and firmly adhered to the heated surface, and the most conventional high-pressure water washing method is often used with little effect. The safe and economic operation of the generator set can be affected when the blockage problem is serious. The other problem in the operation of the air preheater is the component corrosion problem, in the operation process, the surface of a steel plate forming the air preheater can generate the corrosion problem, the surface roughness is improved after corrosion, dirt is more easily adsorbed in subsequent operation, a dirt layer is formed, and the heat exchange efficiency of the air preheater is reduced.

Therefore, the important content in the maintenance work of the air preheater is to perform descaling and rust removal. In the prior art, descaling operation is generally carried out by adopting a mode of soaking with a chemical agent and matching with high-pressure water washing, dirt in an air preheater becomes loose after the chemical agent is soaked, and the dirt is cracked and peeled off during the high-pressure water washing. But an effective solution to the problem of the corrosion of the air preheater is lacked. In general, the size of the air preheater is large, and the mode of detaching the air preheater from the heat exchange equipment and then descaling and derusting is difficult to perform, so that the air preheater is usually maintained in a disassembly-free mode, namely descaling and derusting operation is performed without detaching the air preheater.

The prior art lacks a complete system for carrying out disassembly-free maintenance operation, namely descaling and rust removing operation on the air preheater, so that the operation of carrying out the descaling operation on site is complicated, labor-consuming and low in efficiency, and the existing maintenance system is difficult to provide rust removing maintenance for the air preheater.

SUMMERY OF THE UTILITY MODEL

The utility model provides the disassembly-and-assembly-free descaling and rust removing system of the air preheater, which is reasonable in structural design, capable of transferring and moving in different occasions and high in operation efficiency, and aims to solve the technical problems in the prior art.

The technical scheme adopted by the utility model for solving the technical problems in the prior art is as follows: a disassembly-and-assembly-free descaling and rust removing system of an air preheater comprises a vehicle, wherein an air compressor, a powder recovery device, a flushing descaling device, an abrasive circulating supply device and a collecting device are arranged in a hopper of the vehicle, the collecting device can be taken down from the hopper, and the hopper is also provided with a plurality of abrasive spray guns and a plurality of high-pressure water guns; the powder recovery device comprises a recovery support, a box plate is arranged at the middle upper part of the recovery support to form a recovery box body, a filter bag assembly is arranged in the middle of an inner cavity of the recovery box body, a collecting hopper is arranged at the bottom of the inner cavity, an exhaust fan is arranged at the top of the recovery box body, and a return air cover is arranged at the side part of the recovery box body; the flushing descaling device comprises a box body, a flushing partition plate with a plurality of water permeable windows is installed in the inner cavity of the box body, a rough filtering assembly is installed in a cavity in the front of the flushing partition plate, and a stirring assembly, a fine filtering assembly, an injection assembly and a pressurization output assembly are installed at the top of the cavity in the rear of the flushing partition plate; the abrasive material circulating supply device comprises an outer cylinder with a conical bottom, a discharging conical cylinder is arranged at the middle upper part of an inner cavity of the outer cylinder, an inner cylinder with a filter plate in the middle is arranged above the discharging conical cylinder, and a distributor is arranged at the bottom of the conical bottom.

The utility model has the advantages and positive effects that:

compared with the existing descaling and rust removing equipment and descaling and rust removing mode, the descaling and rust removing system of the air preheater has the advantages that the air preheater is washed and descaled by a high-pressure water source, and the rust on the surface of the air preheater is removed based on the impact action of air flow and abrasive materials. The descaling and rust removing system is a vehicle-mounted system, is very convenient to transfer and move among different occasions, and realizes descaling and rust removing operation on air preheaters at different positions.

Through setting up the washing scale removal device who has stirring subassembly and pressure boost subassembly, realized the stirring mixing and the technical effect of pressure boost supply to washing water source and washing medicament. Through setting up colating subassembly and essence filter assembly for washing scale removal device, realized the filtration treatment to washing water source and washing medicament, the particulate matter impurity that the filtering contains avoids blockking up the high-pressure squirt. Abrasive guns and abrasive separating and supplying device realize the technical effect of separating the abrasive in the backflow air flow and supplying the abrasive to each abrasive gun circularly. Through setting up collection device, realized the collection processing to on-the-spot abrasive material and washing water source, realized the abrasive material and washed the cyclic utilization of water source. By arranging the powder recovery device, interception of small abrasive particles, dirt particles and corrosion particles in the discharged airflow is realized, and direct discharge to the surrounding environment is avoided, so that the disassembly-and-assembly-free descaling and rust removing system is friendly to the operating environment and does not generate dust exhaust emission. The descaling and rust removing system has the self-supply capacity of compressed gas by installing the air compressor on the vehicle, and can utilize a vehicle-mounted power supply as power supply input, so that the system does not need any auxiliary operation condition provided by an operation site, and is an integrated facility of a self-forming unit.

Preferably: the filter bag assembly of the powder recovery device comprises a recovery partition plate arranged in the middle of a recovery box body, a plurality of filter bag mounting holes are formed in a plate body of the recovery partition plate, filter bags are arranged in the filter bag mounting holes, and a pneumatic vibrator is further arranged above the recovery partition plate.

Preferably: the flushing descaling device further comprises an extraction assembly, the extraction assembly comprises an extraction pump arranged at the front part of the box body, an outlet of the extraction pump is connected to the space above the front part of the flushing partition plate and the coarse filtering assembly, and a water pumping hose is connected to an inlet of the extraction pump.

Preferably: the stirring assembly of the washing and descaling device comprises a stirring motor, a stirring shaft is arranged at the bottom of a motor shaft of the stirring motor, and a stirring impeller is arranged at the bottom of the stirring shaft.

Preferably: the fine filtering component of the flushing descaling device comprises a filtering pump and a multi-stage filter element, wherein an inlet of the filtering pump is connected to the bottom of the rear cavity of the flushing partition plate through a pipeline, an outlet of the filtering pump is connected to an inlet of the multi-stage filter element through a pipeline, and an outlet of the multi-stage filter element is connected to a backflow port on the side wall of the rear cavity of the flushing partition plate through a pipeline.

Preferably: the injection assembly of the flushing descaling device comprises an injection pump, the outlet of the injection pump is connected to the cavity at the rear part of the flushing partition plate through a pipeline, and the inlet of the injection pump is connected with an injection hose; the booster output assembly comprises a booster pump, an inlet of the booster pump is connected to the bottom of the rear cavity of the flushing partition plate through a pipeline, and an output pipe with a quick-connection joint at the end part is connected to an outlet of the booster pump.

Preferably: the distributor of the abrasive circulating supply device comprises a shell with an open upper end and a sealed lower end, the top of the shell is in butt joint connection with the bottom of the conical bottom, and a plurality of abrasive output tubes are arranged on the side wall of the shell.

Preferably: the collecting device comprises a cone bucket bracket with a roller, a collecting cone bucket is arranged in the cone bucket bracket, the top of the collecting cone bucket is open, and a flexible sealing plate is arranged on the edge of the top of the collecting cone bucket; the bottom of the collecting cone is provided with a discharge port.

Preferably: a mounting support is mounted on the side of a vehicle hopper of the vehicle, and the abrasive material spray guns and the high-pressure water guns are mounted on the mounting support.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic view of the powder recovery device of FIG. 1;

FIG. 3 is a schematic diagram of the flushing descaling device in FIG. 1;

FIG. 4 is a schematic sectional view of the abrasive circulation supply apparatus of FIG. 1;

fig. 5 is a schematic view of the structure of the collecting device of fig. 1.

In the figure:

1. a vehicle; 2. an air compressor; 3. a powder recovery device; 3-1, an air return cover; 3-2, an exhaust fan; 3-3, a pneumatic vibrator; 3-4, recovering the partition plate; 3-5, a filter bag; 3-6, a collecting hopper; 3-7, a dust removal bracket; 3-8, skip car; 4. an exhaust duct; 5. washing the descaling device; 5-1, a box body; 5-2, an extraction component; 5-3, a coarse filtration component; 5-4, a water permeable window; 5-5, flushing the partition plate; 5-6, a stirring component; 5-7, a fine filter component; 5-8, injecting the component; 5-9, a pressurization output component; 6. an abrasive spray gun; 7. a high pressure water gun; 8. abrasive circulation supply means; 8-1, an exhaust pipeline; 8-2, an air inlet pipeline; 8-3, a filter plate; 8-4, an inner cylinder body; 8-5, material separating cone; 8-6, blanking cone; 8-7, an outer cylinder; 8-8, conical bottom; 8-9 parts of a distributor; 9. connecting a pipeline; 10. a collection device; 10-1, collecting a cone hopper; 10-2, a cone bracket; 10-3, rollers; 11. and (4) a bracket.

Detailed Description

In order to further understand the contents, features and effects of the present invention, the following embodiments are described in detail.

Referring to fig. 1, the disassembly-and-assembly-free descaling and rust removing system of the air preheater comprises a vehicle 1, wherein an air compressor 2, a powder recovery device 3, a flushing descaling device 5, an abrasive circulating supply device 8 and a collection device 10 are installed in a hopper of the vehicle 1, the collection device 10 can be taken down from the hopper, and a plurality of abrasive spray guns 6 and a plurality of high-pressure water guns 7 are further arranged on the hopper.

The main body part of the disassembly-free descaling and rust removing system is arranged on the vehicle 1, so that the disassembly-free descaling and rust removing system is a vehicle-mounted system, is flexible to move and is convenient to transfer among different operation occasions. The air compressor 2 takes a vehicle-mounted power supply as power and is used for providing a compressed air source for the system. The powder recovery device 3 is used for treating the exhaust tail gas generated by the system, and intercepting the abrasive powder, dirt and corrosion powder contained in the exhaust tail gas to avoid the smoke dust emission generated by the system. The collecting device 10 is movable, i.e. can be transferred from the hopper to the lower part of the air preheater for receiving and collecting the above abrasive and dirt, rust debris and also for collecting the rinsing water source. The abrasive circulation supply device 8 is used for separating the abrasive from the airflow returning from the collection device 10 and supplying the separated abrasive to the abrasive spray gun 6 again, so that the abrasive is recycled.

When the washing and descaling operation is carried out, the outlet of the collecting device 10 is connected with the return port of the washing and descaling device 5, the washing water source collected by the collecting device 10 enters the washing and descaling device 5, and is used as a high-pressure washing water source again after being treated by filtration and the like, and is supplied to the high-pressure water gun 7.

When the rust removing operation is carried out, the outlet of the collecting device 10 is connected with the inlet of the grinding material circulating supply device 8 through the connecting pipeline 9, and the airflow outlet of the grinding material circulating supply device 8 is connected with the inlet of the powder recovery device 3 through the air return pipeline 4. The flow path of the abrasive is as follows: abrasive is sprayed to the surface of the air preheater from each abrasive spray gun 6 to remove rust, and then falls into a collection device 10, the abrasive, dirt debris and corrosion debris collected under the action of air flow reach an abrasive circulation supply device 8 through a connecting pipeline 9, the abrasive circulation supply device 8 intercepts large-particle abrasive in the air flow and then supplies the large-particle abrasive to each abrasive spray gun 7 again, the air flow containing powder enters a powder recovery device 3 from the abrasive circulation supply device 8 along an air return pipeline 4, the powder components are intercepted, then the clean air flow is discharged, and the powder is collected and then treated uniformly.

Referring to fig. 2, it can be seen that:

the powder recovery device 3 comprises a recovery support 3-7, a box plate is arranged on the middle upper part of the recovery support 3-7 to form a recovery box body (the box plate is positioned on the front, the back, the left and the right and the top), a filter bag component is arranged in the middle of an inner cavity of the recovery box body, a collecting hopper 3-6 is arranged at the bottom of the inner cavity, an exhaust fan 3-2 is arranged at the top of the recovery box body, and a return air cover 3-1 is arranged at the side part of the recovery box body. As shown in the figure, the air return cover 3-1 enters the interior of the recovery box body through an air return opening arranged on the side wall of the recovery box body. The exhaust fan 3-2 is used for providing airflow power for the whole descaling system, and the collecting hopper 3-6 is used for receiving powder in the airflow.

The filter bag assembly of the powder recovery device 3 comprises a recovery partition plate 3-4 arranged in the middle of a recovery box body, a plurality of filter bag mounting holes are formed in a plate body of the recovery partition plate 3-4, filter bags 3-5 are arranged in the filter bag mounting holes, a pneumatic vibrator 3-3 is further arranged above the recovery partition plate 3-4, and the starting vibrator 3-3 is used for providing a starting vibration effect for the filter bags 3-5 so that powder adsorbed on the surfaces of the filter bags 3-5 can be separated from the filter bags 3-5.

In this embodiment, the pneumatic vibrator 3-3 includes a gas tank with a plurality of gas pipes, the end of each gas pipe extends into the mouth of each filter bag 3-5, the gas inlet of the gas tank is connected with the air compressor 2, each gas pipe is provided with an electromagnetic valve, and by controlling the opening of each electromagnetic valve, compressed gas in the gas tank is discharged from the gas pipe and then impacts the inside of each filter bag 3-5, so that back flushing cleaning is realized, and powder adsorbed on the outer side of each filter bag 3-5 is separated.

Below the collecting hopper 3-6 is a skip 3-8, which skip 3-8 is provided with wheels and thus can move as shown in the figure. And the powder discharged from the collecting hopper 3-6 enters a skip car 3-8, after the single descaling and derusting operation is finished, the skip car 3-8 is transported to a unified treatment occasion by the vehicle 1, and the powder in the skip car 3-8 is poured out for treatment.

Referring to fig. 3, it can be seen that:

the flushing descaling device 5 comprises a box body 5-1, a flushing clapboard 5-5 with a plurality of water permeable windows 5-4 is arranged in the inner cavity of the box body 5-1, and the flushing clapboard 5-5 divides the inner cavity of the box body 5-1 into a front cavity and a rear cavity.

A rough filtering component 5-3 is arranged in a chamber at the front part of the flushing clapboard 5-5, and a stirring component 5-6, a fine filtering component 5-7, an injection component 5-8 and a pressurizing output component 5-9 are arranged at the top part of the chamber at the rear part of the flushing clapboard 5-5. The device comprises a coarse filtering component 5-3, a stirring component 5-6, a fine filtering component 5-7, a high-pressure water gun 7 and a pressurizing output component 5-9, wherein the coarse filtering component 5-3 is used for performing coarse filtering treatment on a recycled washing water source and filtering large-particle impurities, the stirring component 5-6 is used for continuously stirring and filtering a washing water source mixed with a washing agent in a rear cavity to improve the uniform mixing degree of the agent and the water source, the fine filtering component 5-7 is used for performing circulating filtration on the washing water source and further removing contained small-particle impurities, the injection component 5-8 is used for injecting the washing water source into the box body 5-1, and the pressurizing output component 5-9 is used for conveying the washing water source in the box body 5-1 to the high-pressure water gun 7 in a high-pressure mode.

As shown in the figure, the top of the chamber at the front part of the flushing clapboard 5-5 is open, the top of the chamber at the rear part is closed, the rough filtering component 5-3 is arranged at the middle position of the front chamber, the rough filtering component 5-3 structurally comprises a bracket and two layers of filtering pore plates arranged on the bracket, and each filtering pore plate is provided with a filtering cloth. When the recovered cleaning water source flows back to enter the space above the rough filtering component 5-3, the cleaning water source is filtered by the rough filtering component 5-3, large particle impurities are intercepted, the whole rough filtering component 5-3 is taken out from the front cavity periodically, and the rough filtering component 5-3 is cleaned, the filter cloth is replaced and then placed into the front cavity again.

In this embodiment, the washing and descaling device 5 further comprises an extraction assembly 5-2, wherein the extraction assembly 5-2 is used for extracting the collected washing water source to the washing and descaling device 5, and the collected washing water source is recycled after being filtered and the like, so that the consumption of water resources is reduced. As shown in the drawing, the drawing module 5-2 includes a drawing pump provided at the front of the cabinet 5-1, an outlet of the drawing pump is connected to the front of the washing partition 5-5 and a space above the strainer module 5-3, and a suction hose is connected to an inlet of the drawing pump. When the washing and descaling operation is carried out, the collecting device 10 is placed below the air preheater to receive and collect the washing water source, at the moment, the water pumping hose is connected to the outlet of the collecting device 10, and the washing water source collected by the collecting device 10 flows back to the space above the rough filtering component 5-3 under the action of the suction pump. It is of course conceivable to use an on-site drainage trench as a means for collecting the source of cleaning water, the end of the suction hose then being inserted into the interrupted drainage trench.

In this embodiment, the stirring assembly 5-6 of the washing and descaling device 5 includes a stirring motor, a stirring shaft is installed at the bottom of a motor shaft of the stirring motor, and a stirring impeller is installed at the bottom of the stirring shaft.

In this embodiment, the fine filtering component 5-7 of the flushing and descaling device 5 includes a filtering pump and a multi-stage filter element, an inlet of the filtering pump is connected to the bottom of the rear chamber of the flushing partition plate 5-5 through a pipeline, an outlet of the filtering pump is connected to an inlet of the multi-stage filter element through a pipeline, and an outlet of the multi-stage filter element is connected to a return port on the side wall of the rear chamber of the flushing partition plate 5-5 through a pipeline. Therefore, the fine filtering components 5-7 enable the cleaning water source in the rear cavity to form circulating flow, continuous filtering is carried out in the circulating flow process, small particle impurities contained in the cleaning water source are filtered, the problem that the high-pressure water gun 7 is blocked is effectively avoided, the multi-stage filter element is periodically disassembled and cleaned, and reliable fine filtering and filtering capacity is kept.

In this embodiment, the injection assembly 5-8 of the washing and descaling device 5 comprises an injection pump, an outlet of the injection pump is connected to a cavity at the rear part of the washing partition plate 5-5 through a pipeline, and an inlet of the injection pump is connected with an injection hose; the booster output assembly 5-9 comprises a booster pump, an inlet of the booster pump is connected to the bottom of the rear chamber of the flushing partition plate 5-5 through a pipeline, and an output pipe with a quick-connection joint at the end part is connected to an outlet of the booster pump.

The inlet of the injection pump is connected to a cleaning water source through an injection hose, the cleaning water source is injected into the box body 5-1, in order to automatically control the injection amount of the water source, a high-low liquid level sensor can be installed on the side wall of the box body 5-1, the injection assembly 5-8 is started when the liquid level reaches the position of the low liquid level sensor, and the injection assembly 5-8 is stopped when the liquid level reaches the position of the high liquid level sensor. The pressurization output assembly 5-9 is used for conveying a cleaning water source in the box body 5-1 to the high-pressure water gun 7. The quick-connection joint is arranged on the output pipe to improve the convenience of connection between a water supply pipeline of the high-pressure water gun 7 and the output pipe.

Referring to fig. 1 and 4, it can be seen that:

the abrasive circulation supply device 8 is fixedly arranged on the hopper of the vehicle 1 by a bracket 11.

The grinding material circulating supply device 8 comprises an outer cylinder 8-7 with a conical bottom 8-8, a blanking cone 8-6 is arranged at the middle upper part of the inner cavity of the outer cylinder 8-7, an inner cylinder 8-4 with a filter plate 8-3 in the middle is arranged above the blanking cone 8-6, and a distributor 8-9 is arranged at the bottom of the conical bottom 8-8.

An exhaust pipeline 8-1 is installed at the top of the inner cylinder 8-4, an air inlet pipeline 8-2 is installed at the upper part of the side wall of the outer cylinder 8-7, and a material distributing cone 8-5 is installed below the bottom opening of the inner cylinder 8-4. As shown in fig. 1, the exhaust duct 8-1 is connected to an inlet on the return hood 3-1 through the return duct 4. The backflow air flow enters the upper space of the outer cylinder 8-7 through the connecting pipeline 9 and the air inlet pipeline 8-2, then passes through the filter plate 8-3 upwards from the space between the inner cylinder 8-4 and the blanking cone 8-6, large-particle abrasive in the air flow drops on the material separating cone 8-5 after being intercepted by the filter plate 8-3, then drops in the cone bottom 8-8 after passing through the blanking cone 8-6 under the action of self gravity, and then enters the material distributor 8-9. The air flow containing the small particle powder is discharged from the exhaust duct 8-1 and transferred to the abrasive recovery apparatus 3.

In this embodiment, the distributor 8-9 includes a housing with an open upper end and a closed lower end, the top of the housing is connected to the bottom of the tapered bottom 8-8 in a butt joint manner, the side wall of the housing is provided with a plurality of abrasive output pipes, and the abrasive delivery pipes of the abrasive spray guns 6 are connected to the abrasive output pipes in a butt joint manner.

Referring to fig. 5, it can be seen that:

the collecting device 10 comprises a cone bucket support 10-2 with a roller 10-3, a collecting cone bucket 10-1 is arranged in the cone bucket support 10-2, the top of the collecting cone bucket 10-1 is open, and a flexible sealing plate is arranged on the edge of the top of the collecting cone bucket 10-1. An outlet is arranged on the rear wall of the collecting cone hopper 10-1. Due to the arrangement of the roller 10-3, the collecting device 10 can be moved to a position on the operation site, and considering that the collecting device 10 still needs to be reliably connected with the abrasive circulation supply device 8 during the moving process in the rust removing operation stage, in this embodiment, the connecting pipe 9 can be selected as a corrugated pipe with enough structural strength to ensure the air flow circulation and flexibility. The flexible sealing plate arranged on the top edge of the collecting cone hopper 10-1 is used for abutting against the bottom of the air preheater, so that the reliability of combination of the top of the collecting device 10 and the bottom of the air preheater is improved, and the amount of abrasive materials falling to the outside is reduced.

In this embodiment, install the mount support at the car hopper lateral part of vehicle 1, each abrasive material spray gun 6 and each high-pressure squirt 7 mount setting are on the mount support, and the operating personnel of being convenient for takes.

The abrasive spray gun 6 comprises a spray head arranged at the front part and a spray pipe with a switch handle arranged at the rear part, a stabilizing handle is arranged at the middle part of the spray pipe, the spray head is provided with an abrasive input interface, and the switch handle is provided with a compressed air input interface. The abrasive input interface of the spray head is connected to a distributor 8-9 of the abrasive circulation supply device 8 through an abrasive pipeline, and the compressed air input interface with a switch handle is connected to the air compressor through a pipeline. The high-pressure water gun 7 comprises a spray nozzle arranged at the front part, a spray pipe with a switch handle arranged at the rear part, a stabilizing handle arranged at the middle part of the spray pipe, a water source input interface arranged on the switch handle, and the water source input interface is connected with an output pipe of a pressurizing output assembly 5-9 of the washing and descaling device 5 through a high-pressure water pipe.

The working process is as follows:

the dry method descaling system is transferred to a descaling operation site, the air compressor 2 is started through the control box, and the air compressor 2 automatically operates to generate a compressed air source;

firstly, the disassembly-and-assembly-free descaling operation of the air preheater is carried out, specifically: connecting an injection hose of the injection assembly 5-8 to a site cleaning water source, starting an injection pump to inject the cleaning water source into the box body 5-1, putting a chemical agent (liquid agent) for cleaning into the box body 5-1 through an opening at the front part of the box body 5-1, uniformly mixing the cleaning water source and the agent by the stirring assembly 5-6, continuously operating the fine filtering assembly 5-7 in the process, and continuously filtering the cleaning water source in the box; placing the collecting device 10 below the air preheater, and connecting a water pumping hose with an outlet of the air preheater; starting the pressurizing output assembly 5-9, carrying out high-pressure washing on the air preheater by an operator through a high-pressure water gun 7 from top to bottom, enabling a washing water source mixed with dirt and debris after washing to fall into a collecting cone 10-1 of the collecting device 10, injecting washing wastewater collected by the collecting device 10 into a space above the rough filtering assembly 5-3 under the action of the extracting assembly 5-2, and mixing the washing wastewater with the washing water source after filtering;

after the washing and descaling operation is finished, the connection between the water pumping hose and the collecting device 10 is released; blowing the inside of the collecting device 10 by using an abrasive spray gun 6 to remove water;

then, the disassembly-free rust removal operation of the air preheater is carried out, specifically: an outlet on the collecting device 10 is in butt joint connection with the connecting pipeline 9, and a certain amount of grinding materials are placed in a collecting cone hopper 10-1 of the collecting device 10; after the exhaust fan 3-2 is started, abrasive materials in the collecting cone hopper 10-1 enter an abrasive material circulating supply device 8 along a connecting pipeline 9 under the action of air flow, the abrasive materials intercepted by the filter plate 8-3 downwards enter a distributor 8-9, an operator holds an abrasive material spray gun 6 by hand to impact and remove rust at a rust position on an air preheater, the abrasive materials are recycled, powder-containing air flow flows to a rear powder recovery device 3, clean air flow is discharged after powder is filtered and intercepted, and powder materials enter a skip car 3-8 to be further processed;

the grinding material can be selected from biomass grinding materials, namely particles obtained by crushing, grinding, mixing and high-pressure extrusion granulation of biomass, one advantage of the particles is that the grinding effect on the pipe wall is mild, and the other advantage is that when a small amount of residues are left after descaling operation, high-temperature gas/tail gas passes through the air preheater again along with restart of the system, and under the action of continuous high temperature, the biomass grinding material particles can be gradually disintegrated and even become ash and can be discharged from a flue.

Claims (9)

1. The utility model provides an exempt from dismouting scale removal rust cleaning system of air preheater which characterized by: the grinding material circulation and descaling device comprises a vehicle (1), wherein an air compressor (2), a powder recovery device (3), a washing and descaling device (5), a grinding material circulation supply device (8) and a collection device (10) are arranged in a hopper of the vehicle (1), the collection device (10) can be taken down from the hopper, and a plurality of grinding material spray guns (6) and a plurality of high-pressure water guns (7) are also arranged on the hopper; the powder recovery device (3) comprises a recovery support (3-7), a box plate is arranged at the middle upper part of the recovery support (3-7) to form a recovery box body, a filter bag assembly is arranged in the middle of an inner cavity of the recovery box body, a material collecting hopper (3-6) is arranged at the bottom of the inner cavity, an exhaust fan (3-2) is arranged at the top of the recovery box body, and a wind return cover (3-1) is arranged at the side part of the recovery box body; the flushing descaling device (5) comprises a box body (5-1), a flushing partition plate (5-5) with a plurality of water permeable windows (5-4) is installed in the inner cavity of the box body (5-1), a rough filtering component (5-3) is installed in a cavity in front of the flushing partition plate (5-5), and a stirring component (5-6), a fine filtering component (5-7), an injection component (5-8) and a pressurizing output component (5-9) are installed at the top of a cavity at the rear part of the flushing partition plate (5-5); the abrasive material circulating supply device (8) comprises an outer cylinder body (8-7) with a conical bottom (8-8), a blanking cone cylinder (8-6) is arranged at the middle upper part of an inner cavity of the outer cylinder body (8-7), an inner cylinder body (8-4) with a filter plate (8-3) in the middle is arranged above the blanking cone cylinder (8-6), and a distributor (8-9) is arranged at the bottom of the conical bottom (8-8).

2. The disassembly-free descaling and rust removing system of the air preheater as claimed in claim 1, wherein: the filter bag assembly of the powder recovery device (3) comprises a recovery partition plate (3-4) arranged in the middle of a recovery box body, a plurality of filter bag mounting holes are formed in a plate body of the recovery partition plate (3-4), filter bags (3-5) are arranged in the filter bag mounting holes, and a pneumatic vibrator (3-3) is further arranged above the recovery partition plate (3-4).

3. The disassembly-free descaling and rust removing system of the air preheater as claimed in claim 2, wherein: the flushing descaling device (5) further comprises an extraction assembly (5-2), the extraction assembly (5-2) comprises an extraction pump arranged at the front part of the box body (5-1), an outlet of the extraction pump is connected to the front part of the flushing partition plate (5-5) and a space above the coarse filtering assembly (5-3), and an inlet of the extraction pump is connected with a water pumping hose.

4. The disassembly-free descaling and rust removing system of the air preheater as claimed in claim 3, wherein: the stirring component (5-6) of the washing and descaling device (5) comprises a stirring motor, wherein the bottom of a motor shaft of the stirring motor is provided with a stirring shaft, and the bottom of the stirring shaft is provided with a stirring impeller.

5. The disassembly-free descaling and rust removing system of the air preheater as claimed in claim 4, wherein: the fine filtering component (5-7) of the flushing and descaling device (5) comprises a filtering pump and a multi-stage filter element, wherein the inlet of the filtering pump is connected to the bottom of the rear cavity of the flushing partition plate (5-5) through a pipeline, the outlet of the filtering pump is connected to the inlet of the multi-stage filter element through a pipeline, and the outlet of the multi-stage filter element is connected to a backflow port on the side wall of the rear cavity of the flushing partition plate (5-5) through a pipeline.

6. The disassembly-free descaling and rust removing system of the air preheater as claimed in claim 5, wherein: an injection assembly (5-8) of the flushing descaling device (5) comprises an injection pump, the outlet of the injection pump is connected to a cavity at the rear part of the flushing clapboard (5-5) through a pipeline, and the inlet of the injection pump is connected with an injection hose; the booster output assembly (5-9) comprises a booster pump, an inlet of the booster pump is connected to the bottom of the rear cavity of the flushing partition plate (5-5) through a pipeline, and an output pipe with a quick-connection joint at the end part is connected to an outlet of the booster pump.

7. The disassembly-free descaling and rust removing system of the air preheater as claimed in claim 6, wherein: the distributor (8-9) of the abrasive circulating supply device (8) comprises a shell with an open upper end and a sealed lower end, the top of the shell is in butt joint connection with the bottom of the conical bottom (8-8), and a plurality of abrasive output pipes are arranged on the side wall of the shell.

8. The disassembly-free descaling and rust removing system of the air preheater as claimed in claim 7, wherein: the collecting device (10) comprises a cone hopper support (10-2) with a roller (10-3), a collecting cone hopper (10-1) is installed in the cone hopper support (10-2), the top of the collecting cone hopper (10-1) is open, and a flexible sealing plate is installed on the edge of the top of the collecting cone hopper (10-1); the bottom of the collecting cone (10-1) is provided with a discharge port.

9. The disassembly-free descaling and rust removing system of the air preheater as claimed in claim 8, wherein: a mounting support is arranged on the side of a hopper of the vehicle (1), and the abrasive material spray guns (6) and the high-pressure water guns (7) are mounted on the mounting support.

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