CN211399767U - Dust collecting device for slag cooler of circulating fluidized bed boiler - Google Patents

Abstract

The utility model relates to a dust collecting device for a slag cooler of a circulating fluidized bed boiler, which comprises an air preheater. The flue gas side of the air preheater is in a negative pressure state and communicates with a flue at the tail of the boiler. The air side of the boiler is communicated with the inlet passage of the boiler; it also includes a pipe connecting the cooling chamber of the slag cooler and the flue gas side of the air preheater, and both ends of the pipe are provided with valves. The utility model can utilize the waste heat of the flue gas to heat the air discharged into the combustion chamber of the boiler to play a combustion-supporting role, thereby saving the heat in the combustion chamber consumed by the combustion-supporting air. In addition, the negative pressure of the air preheater is used to suck the floating dust generated in the slag cooler into the flue gas side of the air preheater, which avoids the leakage of the floating dust from the gap of the slag cooler, improves the environment of the workshop, and prevents the staff health is affected. At the same time, part of the heat remaining in the floating dust can also be recovered by the flue gas side of the air preheater to heat the combustion air together with the flue gas discharged from the boiler, reducing energy waste.

Description

Circulating fluidized bed boiler slag cooler dust collector

technical field

The utility model relates to the field of boiler equipment, in particular to a dust collecting device for a circulating fluidized bed boiler slag cooler.

Background technique

Circulating fluidized bed boilers are often used in power stations, factories and other enterprises with huge heat consumption. It has the advantages of wide fuel adaptability and high combustion efficiency, and can use coal gangue, oil shale, municipal waste, silt, straw, etc. as fuel.

The slag cooler is an important equipment for the operation of the circulating fluidized bed boiler. It is a continuous operation equipment in the operation of the boiler. It is used to cool the waste residue generated after the combustion of fuel, so that the waste residue can be rapidly cooled, so as to reach a temperature suitable for discharge. The heat contained in the waste residue is recovered. However, when the slag cooler is cooling the slag, in order to increase the heat exchange area of the slag, the slag will roll in the slag cooler, so a large amount of floating ash will be generated. The cracks and other places seep out, and then spread into the workshop, which not only seriously pollutes the workshop environment, causing the workshop to be dirty and messy, but also easily inhaled by the staff, causing serious harm to the staff. The traditional solution is to install vacuum equipment around the slag cooler, which is expensive, complicated in structure, and inconvenient to maintain, which increases the production cost of the enterprise.

Utility model content

Aiming at the deficiencies of the prior art, the utility model provides a dust collector for a circulating fluidized bed boiler slag cooler, which can utilize the waste heat of flue gas to heat the air discharged into the boiler combustion chamber to play a combustion-supporting role, thereby recovering heat The function of reducing energy consumption and reducing energy waste. It also improves the environment of the workshop, improves the cleanliness of the workshop, and also prevents the staff from working in a dusty environment and prevents the health of the staff from being affected.

The utility model is realized by the following technical solutions, and provides a dust collecting device for a circulating fluidized bed boiler slag cooler, including an air preheater, the flue gas side of the air preheater is in a negative pressure state and is connected to the boiler tail The flue is connected, and the air side of the air preheater is connected with the inlet passage of the boiler;

It also includes a pipeline connecting the cooling chamber of the slag cooler and the flue gas side of the air preheater, and both ends of the pipeline are provided with valves.

The air preheater of this scheme is installed at the tail of the boiler, which is a kind of preheating equipment to improve the heat exchange performance of the boiler and reduce the heat loss. The air preheater is provided with a flue gas side and an air side. The flue gas side and the air side are adjacent to each other but not connected to each other. The flue gas generated by the combustion of the boiler is discharged into the flue gas side, and is discharged into the combustion chamber of the boiler to play the role of combustion-supporting air. Before entering the combustion chamber, it is discharged into the air side, and the heat on the flue gas side can be transferred to the air, thereby preheating the air to a certain temperature. The flue gas side of the air preheater is connected to the subsequent flue gas treatment device, that is, the flue gas generated by the boiler first passes through the air preheater, conducts heat exchange in the air preheater and then is discharged into the flue gas treatment device, and then uses the flue gas The treatment device removes the soot and harmful gases in the flue gas, and finally discharges it into the atmosphere through the chimney.

The flue gas side of the air preheater has the characteristics of negative pressure, because the pipeline connects the cooling chamber of the slag cooler and the flue gas side of the air preheater, so the negative pressure on the flue gas side of the air preheater can be used to cool the slag cooler. The floating dust generated by the cooling chamber is sucked into the air preheater through the pipeline, so as to achieve the purpose of dust suction. Both ends of the valve are provided with flanges, and both ends of the pipeline are also provided with flanges. One end of the valve located on one side of the air preheater is connected to the flue gas side of the air preheater through a flange, and the other end is connected to one end of the pipeline through a flange. One end of the valve on one side of the slag cooler is connected to the cooling chamber of the slag cooler through a flange, and the other end is connected to the other end of the pipeline through a flange. Through the valve, the communication between the cooling chamber of the slag cooler and the flue gas side of the air preheater can be disconnected from the pipeline, which is convenient for the maintenance of the pipeline.

As an optimization, both ends of the pipeline are provided with three-way pipes, and the two three-way pipes are located between the two valves. The open end of one three-way pipe is fixed with a pipe cap, and the pipe cap is sealed and fixed to communicate with the three-way pipe. The open end of the other three-way pipe is fixedly connected to the connected dust collecting box, and the dust collecting box is provided with an air outlet connected to the filter cotton and an ash discharge port connected to the baffle.

The three-way pipe of this scheme has three open ends in total, two of which are connected in series on the pipe to keep the pipe in passage, and one end is open. The pipe cap is fixedly connected to the open end of one of the three-way pipes, thereby blocking the open end of the three-way pipe. A through hole is opened in the middle of the pipe cap, and the gas nozzle is inserted into the corresponding three-way pipe through the through hole. The inner periphery of the through hole is sealed and fixed. The gas nozzle can allow the gas to flow in one direction, so the corresponding three-way pipe can be inflated through the gas nozzle, but the gas in the three-way pipe cannot leak from the gas nozzle.

The dust collecting box is provided with a circular through groove whose diameter is adapted to the diameter of the open end of the tee pipe, and the open end of the other tee pipe is inserted into the circular through groove and then sealed and fixed to the dust collecting box. The dust collecting box is provided with an air outlet, and the filter cotton is fixed on the dust collecting box to block the air outlet. The filter cotton can filter the floating dust in the air and only allow the gas to pass through the filter cotton. The dust collection box is also provided with an ash discharge port, and the baffle plate is movably connected to the dust collection box to block the ash discharge port. The ash inside is discharged.

When in use, the two valves are closed, and the pipeline is in a closed state at this time. Then connect the air nozzle with an air pump, and input high-pressure air into the pipeline through the air nozzle. The high-pressure air can blow the residual ash in the pipeline into the dust collecting box, and the filter cotton can filter the floating dust in the air, and only allow the gas to pass through the filter cotton. Therefore, the dust in the duct can be blown into the dust box. Then open the baffle, so that the floating dust accumulated in the dust box can be discharged through the dust discharge port. Thereby, the work of cleaning the residual dust in the pipeline is completed.

Preferably, the dust box is arranged below the corner of the duct. Dust can fall directly into the dust box from the corner of the pipe, reducing the residual amount of dust in the pipe.

Preferably, the upper end of the dust collecting box is connected to the opening end and the lower end opening of the corresponding tee pipe, and the upper and lower ends of the filter cotton are fixed with metal orifice plates, and the metal orifice plates are horizontally fixed on the dust collecting box. lower opening. The metal orifice plate of this scheme sandwiches the filter cotton in the middle, and the air can pass through the holes of the metal orifice plate. The filter cotton is reinforced by the metal orifice plate, which makes the filter cotton easier to install.

As an optimization, a scraper parallel to the side of the dust box is slidably arranged in the dust box, the outer circumference of the scraper is adapted to the inner circumference of the dust box, and the lower end surface of the scraper is in line with the upper surface of the corresponding metal orifice plate. The end face is adapted, and one side of the scraper is fixedly connected to the handle passing through the dust box. The scraper of this scheme can slide in the dust collecting box, the outer circumference of the scraper is close to the inner circumference of the dust collecting box, the lower end face of the scraper is close to the upper end face of the upper metal orifice plate, and the handle is located on the scraper facing the ash discharge port The lower edge of the ash discharge port is flush with the upper end face of the metal orifice plate located above. When it is necessary to clean the dust in the dust collecting box, open the baffle plate at the ash discharge port, and use the handle to pull the scraper. Dust is discharged from the dust box. After unloading, push the scraper back with the handle and close the baffle. The dust removal work of the dust box is completed by the action of one pull and one push, which further simplifies the work of dust removal. The handle is a horizontal round rod, and the dust box is provided with a round hole at the position corresponding to the round rod. The handle passes through the round hole, and the outer circumference of the handle is closely attached to the inner circumference of the through hole, so that dust cannot pass from the handle and the round hole. oozing from the gap between.

Preferably, the ash discharge port is located at the bottom of one side of the dust collection box, the shape of the baffle is adapted to the dust discharge port, and is hinged with the bottom of one side of the dust collection box; the baffle is also installed with the dust collection box. Adapted locking mechanism. The area of the baffle plate in this scheme is larger than that of the ash discharge opening, and the baffle plate can be closely attached to the side of the dust collecting box, thereby sealing the ash discharge opening. The position of the baffle is limited by the locking mechanism, so that the baffle can be fixed on the side of the dust collecting box to seal the ash discharge opening. When unloading ash, open the locking mechanism and fold down the baffle plate, so that the ash discharge port can be opened.

Preferably, the locking mechanism includes a first screw hole on the baffle plate and a second screw hole on the dust collecting box corresponding to the position of the first screw hole, and the first screw hole is internally threaded with the first screw hole. Two screw holes are suitable for bolts. The bolts are always installed in the first screw holes. When the baffle is locked, the bolts are tightened, and then the bolts are screwed into the second screw holes, so as to realize the locking of the baffle. The structure is simple and the operation is convenient.

Preferably, the slag cooler is a water-cooled drum slag cooler, the tail of the drum of the water-cooled drum slag cooler is connected to a fixed dust shield, and the pipe is located on the top of the dust shield. The drum of the water-cooled drum slag cooler of this solution is driven to rotate by a motor, the dust shield is located on one side of the ash discharge pipe of the water-cooled drum slag cooler, and the pipes and the dust shield are in the prior art. Since the floating dust generated when the fuel waste slag rolls in the drum floats upward, arranging the pipe on the top of the dust shield can absorb as much dust as possible and improve the dust suction efficiency.

Preferably, one end of the pipe close to the slag cooler is communicated with the top of the dust shield through a metal hose. Both ends of the metal hose in this scheme are provided with flanges, one end of the metal hose is connected with the slag cooler through the flange, and the other end is connected with the corresponding valve through the flange. Since the slag cooler will vibrate during the working process, the slag cooler and the pipeline are connected by metal hoses, which can prevent the vibration generated by the slag cooler from being transmitted to the pipeline, avoid the pipeline from being damaged by vibration, and improve the safety of the pipeline. .

As an optimization, the anti-blocking ball valve in communication is fixedly connected to the pipeline. The anti-blocking ball valve of this scheme is set just below the corner of the pipeline and is usually closed. Since the corners of the pipeline are most likely to collect dust, the anti-blocking ball valve can be opened regularly, and the anti-blocking ball valve can be used to release the dust in the pipeline to prevent dust accumulation. Pipe is blocked.

The beneficial effects of the utility model are as follows: the utility model can utilize the waste heat of the flue gas to heat the air discharged into the boiler combustion chamber to play a combustion-supporting role, thereby recovering heat, thereby saving the combustion-supporting air consumption of the heat in the combustion chamber, The heat exchange performance of the boiler is improved, the energy consumption is reduced, and the energy waste is reduced. In addition, the negative pressure of the air preheater is used to suck the floating dust generated in the slag cooler into the flue gas side of the air preheater, which avoids the leakage of the floating dust from the gap of the slag cooler, improves the environment of the workshop, and improves the workshop environment. The cleanliness of the staff also prevents the staff from working in a dusty environment and prevents the health of the staff from being affected. At the same time, part of the heat remaining in the floating dust can also be recovered by the flue gas side of the air preheater to heat the combustion air together with the flue gas discharged from the boiler, further recovering energy and reducing energy waste.

Description of drawings

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

Fig. 2 is an enlarged view of part I of Fig. 1;

Fig. 3 is the partial enlarged view of II of Fig. 1;

Shown in the picture:

1. Air preheater, 2. Slag cooler, 3. Pipeline, 4. Valve, 5. Three-way pipe, 6. Pipe cap, 7. Air nozzle, 8. Dust collection box, 9. Baffle plate, 10, Filter cotton, 11, metal orifice plate, 12, scraper, 13, bolts, 14, dust cover, 15, metal hose, 16, anti-blocking ball valve.

Detailed ways

In order to clearly illustrate the technical features of the solution, the solution will be described below through specific implementations.

A circulating fluidized bed boiler slag cooler dust collection device, as shown in the figure, includes an air preheater 1, and the flue gas side of the air preheater 1 is in a negative pressure state and communicates with the boiler tail flue, and the air preheats The air side of the boiler 1 is communicated with the inlet passage of the boiler; it also includes a pipeline 3 that communicates the cooling cavity of the slag cooler 2 and the flue gas side of the air preheater 1. Both ends of the pipeline 3 are provided with valves 4. In this embodiment, Valve 4 is a butterfly valve, the butterfly valve has a simple structure, is convenient and quick to open and close, saves labor, and is more convenient to use.

Both ends of the pipeline 3 are provided with three-way pipes 5, and the two three-way pipes 5 are located between the two valves 4, wherein the open end of one three-way pipe 5 is fixed with a pipe cap 6, and the pipe cap 6 is sealed and fixed to communicate with the three-way pipe. The air nozzle 7 of 5 and the open end of the other three-way pipe 5 are fixedly connected to the connected dust collecting box 8 . The upper end of the dust collecting box 8 is connected to the opening end and the lower end opening of the corresponding three-way pipe 5 , the upper and lower ends of the filter cotton 10 are fixed to the metal orifice plate 11 , and the metal orifice plate 11 is horizontally fixed to the lower end opening of the dust collecting box 8 . . The dust collecting box 8 is slidably provided with a scraper 12 parallel to the side surface of the dust collecting box 8 . The end faces are adapted, and one side of the scraper 12 is fixedly connected to the handle passing through the dust collecting box 8 .

The ash discharge port is located at the bottom of one side of the dust collecting box 8. The shape of the baffle plate 9 is adapted to the ash discharge opening and is hinged with the bottom of one side of the dust collecting box 8; locking mechanism. The locking mechanism includes a first screw hole opened on the baffle plate 9, a second screw hole opened on the dust collecting box 8 corresponding to the position of the first screw hole, and the first screw hole is threadedly connected with the second screw hole. 13 of the bolts.

The slag cooler 2 is a water-cooled drum slag cooler, the tail of the drum of the water-cooled drum slag cooler is connected to a fixed dust shield 14 , and the pipe 3 is located on the top of the dust shield 14 . One end of the pipe 3 close to the slag cooler 2 is communicated with the top of the dust shield 14 through a metal hose 15 .

The air preheater 1 is installed at the tail of the boiler, which is a kind of preheating equipment to improve the heat exchange performance of the boiler and reduce the heat loss. The air preheater 1 is provided with a flue gas side and an air side, and the flue gas side and the air side are adjacent to each other but not connected to each other. The air is discharged into the air side before entering the combustion chamber, and the heat on the flue gas side can be transferred to the air, thereby preheating the air to a certain temperature. The flue gas side of the air preheater 1 is connected to the subsequent flue gas treatment device, that is, the flue gas generated by the boiler first passes through the air preheater 1, conducts heat exchange in the air preheater 1, and then is discharged into the flue gas treatment device, and then The smoke and harmful gases in the flue gas are removed by the flue gas treatment device, and finally discharged into the atmosphere through the chimney.

The flue gas side of the air preheater 1 has the characteristics of negative pressure, because the pipeline 3 connects the cooling cavity of the slag cooler 2 and the flue gas side of the air preheater 1, so the negative pressure existing on the flue gas side of the air preheater 1 is used. The floating dust generated by the cooling chamber of the slag cooler 2 can be sucked into the air preheater 1 through the pipeline 3, so as to achieve the purpose of dust suction. Both ends of the valve 4 are provided with flanges, and both ends of the pipeline 3 are also provided with flanges. One end of the valve 4 located on one side of the air preheater 1 is connected to the flue gas side of the air preheater 1 through a flange, and the other end is connected to one end of the pipe 3 through a flange. One end of the valve 4 located on one side of the slag cooler 2 is connected to the cooling chamber of the slag cooler 2 through a flange, and the other end is connected to the other end of the pipeline 3 through a flange. The connection of the pipeline 3 to the cooling chamber of the slag cooler 2 and the flue gas side of the air preheater 1 can be disconnected through the valve 4, which is convenient for the maintenance of the pipeline 3.

The three-way pipe 5 has three open ends, wherein the two open ends are connected to the pipe 3 in series to keep the pipe 3 in passage, and one end is open. The pipe cap 6 is fixedly connected to the open end of one of the three-way pipes 5, thereby blocking the open end of the three-way pipe 5, a through hole is opened in the middle of the pipe cap 6, and the air nozzle 7 is inserted into the corresponding three-way pipe 5 through the through hole. Inside, the outer circumference of the gas nozzle 7 is sealed and fixed to the inner circumference of the through hole. The gas nozzle 7 can allow the gas to flow in one direction, so the corresponding three-way pipe 5 can be inflated through the gas nozzle 7 , but the gas in the three-way pipe 5 cannot leak from the gas nozzle 7 .

The dust collecting box 8 is provided with a circular through groove whose diameter matches the diameter of the open end of the three-way pipe 5 , and the open end of the other three-way pipe 5 is inserted into the circular through groove and then sealed and fixed to the dust collecting box 8 . The dust collecting box 8 is provided with an air outlet, and the filter cotton 10 is fixed on the dust collecting box 8 to block the air outlet. The dust collecting box 8 is also provided with an ash discharge port, and the baffle plate 9 is movably connected to the dust collecting box 8 to block the ash discharge port. When the dust collecting box 8 needs to discharge dust, the baffle plate 9 can be opened, so that the The port discharges the floating ash in the dust collecting box 8 .

When in use, the two valves 4 are closed, and the pipeline 3 is in a closed state at this time. Then connect the air nozzle 7 with an air pump, and input high-pressure air into the pipeline 3 through the air nozzle 7. The high-pressure air can blow the ash remaining in the pipeline 3 into the dust collecting box 8, and the filter cotton 10 can filter the floating dust in the air. The gas passes through the filter cotton 10 , so that the dust in the duct 3 can be blown into the dust collecting box 8 . Then, the baffle plate 9 is opened, so that the floating ash accumulated in the dust collecting box 8 can be discharged through the dust discharge opening. Thus, the work of cleaning the residual dust in the pipeline 3 is completed. The dust box 8 is arranged below the corner of the duct 3 . The dust can fall directly into the dust collecting box 8 from the corner of the duct 3 , which reduces the residual amount of dust in the duct 3 .

The metal orifice plate 11 sandwiches the filter cotton 10 , and air can pass through the holes of the metal orifice plate 11 . The filter cotton 10 is reinforced by the metal orifice plate 11 , so that the filter cotton 10 is easier to install.

The scraper 12 can slide in the dust collecting box 8, the outer circumference of the scraper 12 is close to the inner circumference of the dust collecting box 8, and the lower end face of the scraper 12 is close to the upper end face of the metal orifice plate 11 located above. The upper end surface of the metal orifice plate 11 is relatively smooth, so the scraper 12 can scrape through the upper end surface of the metal orifice plate 11, and the scraper 12 and the filter cotton 10 are separated by the metal orifice plate 11, which avoids the direct contact between the scraper 12 and the filter cotton 10. Further, it is avoided that the filter cotton 10 is turned up by the scraper 12 because the material of the filter cotton 10 is soft. The handle is located on the side of the scraper 12 facing the ash discharge opening, and the lower edge of the ash discharge opening is flush with the upper end surface of the metal orifice plate 11 located above. When it is necessary to clean the dust in the dust collecting box 8, open the baffle plate 9 at the ash discharge port, and use the handle to pull the scraper 12. The scraper 12 can scrape the dust accumulated on the metal orifice plate 11 to the ash discharge port, thereby The dust is discharged from the dust box 8 through the dust discharge port. After unloading, use the handle to push back the scraper 12 and close the baffle 9. The dust removal work of the dust collecting box 8 is completed through the actions of one pull and one push, which further simplifies the dust removal work. The handle is a horizontal round rod. The dust collecting box 8 is provided with a round hole at the position corresponding to the round rod. The handle passes through the round hole, and the outer circumference of the handle is closely fitted with the inner circumference of the through hole, so that dust cannot pass from the handle and the round hole. oozing from the gaps between.

The area of the baffle plate 9 is larger than that of the ash discharge opening, and the baffle plate 9 can be closely attached to the side surface of the dust collecting box 8, thereby sealing the ash discharge opening. The position of the baffle 9 is limited by the locking mechanism, so that the baffle 9 can be fixed on the side of the dust collecting box 8 to seal the ash discharge opening. When unloading dust, open the locking mechanism, and fold down the baffle 9, so that the dust discharge port can be opened.

The bolts 13 are always installed in the first screw holes. When the baffle plate 9 is locked, the bolts 13 are tightened, and then the bolts 13 are screwed into the second screw holes, so as to realize the locking of the baffle plate 9. The structure is simple and the operation is convenient. .

The drum of the water-cooled drum slag cooler is driven by a motor to rotate, and the dust shield 14 is located on the side of the ash discharge pipe of the water-cooled drum slag cooler. The pipe 3 and the dust shield 14 are both in the prior art, and will not be repeated here. . Since the floating dust generated when the fuel waste slag rolls in the drum floats upwards, arranging the pipe 3 on the top of the dust shield 14 can absorb as much dust as possible and improve the dust suction efficiency.

Both ends of the metal hose 15 are provided with flanges, one end of the metal hose 15 is connected with the slag cooler 2 through a flange, and the other end is connected with the corresponding valve 4 through a flange. Since the slag cooler 2 will vibrate during the working process, the slag cooler 2 and the pipeline 3 are connected by the metal hose 15, which can prevent the vibration generated by the slag cooler 2 from being transmitted to the pipeline 3, and prevent the pipeline 3 from being damaged by vibration. Thus, the safety of the pipeline 3 is improved.

As an optimized solution, the anti-blocking ball valve 16 that communicates with each other is fixedly connected to the pipeline 3 . The anti-blocking ball valve 16 of this optimized solution is arranged just below the corner of the pipeline 3 and is usually closed. Since the corner of the pipeline 3 is most likely to collect dust, the anti-blocking ball valve 16 can be opened regularly, and the pipeline is released through the anti-blocking ball valve 16 Dust accumulation in 3 to prevent pipe 3 from clogging.

When in use, both the boiler and the slag cooler 2 are in normal working state, and the fuel waste slag produced by the combustion of the boiler is discharged into the cooling chamber of the slag cooler 2, and the slag cooler 2 drives the waste slag to roll, thereby achieving the purpose of cooling. During the tumbling of the slag, a large amount of floating dust is generated, and the floating dust floats on the upper part of the cooling chamber of the slag cooler 2. The flue gas generated by the combustion of the boiler is discharged into the flue gas side of the air preheater 1, and the air discharged into the combustion chamber of the boiler to support combustion is discharged into the air side before entering the combustion chamber, and the heat on the flue gas side can be transferred to the air, thereby Preheat the air to a certain temperature. The flue gas side of the air preheater 1 generates negative pressure, and the two valves 4 are opened, so that the pipeline 3 is connected to the cooling chamber of the slag cooler 2 and the flue gas side of the air preheater 1. Under the action of negative pressure, it floats in the slag cooler 2 The floating dust in the upper part of the cooling chamber is sucked into the flue gas side of the air preheater 1 through the metal hose 15 and the pipe 2 in turn, so as to complete the vacuuming of the slag cooler 2 .

Due to the limited pressure value of the negative pressure generated on the flue gas side of the air preheater 1, some dust may remain in the duct 3, so it is necessary to regularly clean the dust remaining in the duct 3. When cleaning the dust in the pipeline 3, close the two valves 4, and the pipeline 3 is in a closed state at this time. Then connect the air nozzle 7 with an air pump, and input high-pressure air into the pipeline 3 through the air nozzle 7. The high-pressure air can blow the ash remaining in the pipeline 3 into the dust collecting box 8, and the filter cotton 10 can filter the floating dust in the air. The gas passes through the filter cotton 10 , so that the dust in the duct 3 can be blown into the dust collecting box 8 . After blowing for a period of time, stop the input of high-pressure air into the pipeline 3 through the air nozzle 7, then loosen the bolt 13, and the bolt 13 is detached from the second screw hole, thereby disconnecting the connection between the baffle 9 and the dust collecting box 8 , because the bolts 13 are always installed in the first screw holes, there is no need to remove the bolts 13 from the baffle 9, so the bolts 13 will not be lost. Open the baffle 9, pull the scraper 12 with the handle, the scraper 12 can scrape the dust accumulated on the metal orifice 11 to the ash discharge port, so as to discharge the dust from the dust collecting box 8 through the ash discharge port. After unloading, use the handle to push back the scraper 12, close the baffle 9, and then tighten the bolt 13. The dust removal work of the dust collecting box 8 is completed through the actions of one pull and one push, which further simplifies the dust removal work. After the above steps, the work of cleaning the dust remaining in the pipeline 3 is completed.

The utility model can utilize the waste heat of the flue gas to heat the air discharged into the boiler combustion chamber to play a combustion-supporting role, and plays the role of recovering heat, thereby saving the combustion-supporting air consuming the heat in the combustion chamber and improving the heat exchange performance of the boiler. Reduce energy consumption and reduce energy waste. In addition, the negative pressure of the air preheater is used to suck the floating dust generated in the slag cooler 2 into the flue gas side of the air preheater, so as to avoid the leakage of the floating dust from the gap of the slag cooler 2, improve the environment of the workshop and increase the It improves the cleanliness of the workshop, and also prevents the staff from working in a dusty environment, preventing the health of the staff from being affected. At the same time, part of the heat remaining in the floating dust can also be recovered by the flue gas side of the air preheater to heat the combustion air together with the flue gas discharged from the boiler, further recovering energy and reducing energy waste.

Of course, the above description is not limited to the above examples, and the undescribed technical features of the present invention can be realized by or using the existing technology, and will not be repeated here; the above embodiments and accompanying drawings are only used to illustrate the technology of the present invention. The solution is not intended to limit the present utility model. The present utility model is described in detail with reference to the preferred embodiments. Those of ordinary skill in the art should understand that the Changes, modifications, additions or substitutions do not depart from the purpose of the present invention, and should also belong to the protection scope of the claims of the present invention.

Claims (9)

1. The utility model provides a cold sediment machine dust arrester installation of circulating fluidized bed boiler which characterized in that: the air preheater comprises an air preheater (1), wherein the smoke side of the air preheater (1) is in a negative pressure state and is communicated with a tail flue of a boiler, and the air side of the air preheater (1) is communicated with an air inlet channel of the boiler;

still including pipeline (3) of intercommunication cold sediment machine (2) cooling chamber and air heater (1) flue gas side, the both ends of pipeline (3) all are equipped with valve (4).

2. The dust collecting device for the slag cooler of the circulating fluidized bed boiler according to claim 1, characterized in that: the two ends of the pipeline (3) are respectively provided with a three-way pipe (5), the two three-way pipes (5) are positioned between the two valves (4), the open end of one three-way pipe (5) is fixedly connected with a pipe cap (6), the pipe cap (6) is fixedly connected with an air tap (7) of the communicated three-way pipe (5) in a sealing manner, the open end of the other three-way pipe (5) is fixedly connected with a communicated dust collection box (8), and the dust collection box (8) is provided with an air outlet connected with filter cotton (10) and an ash discharge port connected with a baffle (9).

3. The dust collecting device for the slag cooler of the circulating fluidized bed boiler according to claim 2, characterized in that: the upper end of the dust collection box (8) is connected with the opening end and the lower end opening of the corresponding three-way pipe (5), the upper end face and the lower end face of the filter cotton (10) are fixedly connected with metal pore plates (11), and the metal pore plates (11) are transversely and fixedly connected with the lower end opening of the dust collection box (8).

4. The dust collecting device of the slag cooler of the circulating fluidized bed boiler according to claim 3, characterized in that: a scraping plate (12) parallel to the side face of the dust collection box (8) is arranged in the dust collection box (8) in a sliding mode, the periphery of the scraping plate (12) is matched with the inner periphery of the dust collection box (8), the lower end face of the scraping plate (12) is matched with the upper end face of the corresponding metal hole plate (11), and one side of the scraping plate (12) is fixedly connected with a handle penetrating through the dust collection box (8).

5. The dust collecting device for the slag cooler of the circulating fluidized bed boiler according to claim 2, characterized in that: the ash discharging port is positioned at the bottom of one side of the dust collection box (8), and the baffle (9) is matched with the ash discharging port in shape and is hinged with the bottom of one side of the dust collection box (8);

the baffle plate (9) is also provided with a locking mechanism matched with the dust collection box (8).

6. The dust collecting device for the slag cooler of the circulating fluidized bed boiler according to claim 5, characterized in that: the locking mechanism comprises a first screw hole formed in the baffle plate (9) and a second screw hole formed in the dust collection box (8) and corresponding to the first screw hole, and a bolt (13) matched with the second screw hole is connected with the first screw hole in an inner thread mode.

7. The dust collecting device for the slag cooler of the circulating fluidized bed boiler according to claim 1, characterized in that: the slag cooler (2) is a water-cooled roller slag cooler, the tail part of a roller of the water-cooled roller slag cooler is connected with a fixedly arranged dust hood (14), and the pipeline (3) is positioned at the top of the dust hood (14).

8. The dust collecting device for the slag cooler of the circulating fluidized bed boiler according to claim 7, characterized in that: one end of the pipeline (3) close to the slag cooler (2) is communicated with the top of the dust hood (14) through a metal hose (15).

9. The dust collecting device for the slag cooler of the circulating fluidized bed boiler according to claim 1, characterized in that: and the pipeline (3) is fixedly connected with a communicated anti-blocking ball valve (16).

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