Automatic ash removal device of tubular heat exchanger and tubular heat exchanger

Abstract

The utility model provides an automatic ash removal device of a tubular heat exchanger and the tubular heat exchanger, the automatic ash removal device comprises an ash hopper arranged at the bottom of a heat exchange cavity and used for collecting particulate matters generated by high-temperature incineration of an incinerator, and the particulate matters freely settle and roll down to the bottom of the ash hopper; the ash storage barrel is communicated with the bottom of the ash hopper, and particles collected by the ash hopper are stored in the ash storage barrel; the purging assembly comprises an air source arranged on the outer side of the heat exchange cavity, a spray head arranged on the inner side of the heat exchange cavity and an air pipe connected with the air source and the spray head, the spray head is aligned with the heat exchange element, particulate matter accumulated and attached to the surface of the heat exchange element is purged through the purging assembly, and the blown-off particulate matter is collected and stored through an ash hopper and an ash storage barrel; particles accumulated and attached to the surface of the heat exchange element are cleaned in time through the purging assembly, and the problems that in the prior art, an incinerator heat exchanger is not provided with a corresponding ash cleaning device, consequently, the heat exchange element is blocked, and the system operation failure rate is increased are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchanger dust cleaning, in particular to an automatic dust cleaning device for a tubular heat exchanger and a tubular heat exchanger. Background Art

[0002] The combined process of zeolite concentrator and incinerator is a VOCs waste gas treatment technology for large air volume and low concentration, in which the VOCs gas adsorbed on the surface of the zeolite concentrator is desorbed by a small amount of hot air to form a small air volume and high concentration waste gas that enters the incinerator for incineration. The desorption heat source comes from the incinerator heat exchanger, usually at a temperature of 180-220°C. The hot side gas of the incinerator heat exchanger is the flue gas in the incinerator furnace, usually at a temperature of 760-850°C. However, the raw and auxiliary materials used in the production of workshops in the pan-semiconductor industry contain silicon-containing organic matter, such as HMDS (hexamethyldisilazane, molecular formula [(CH3)3Si]2NH) and other similar organic matter. Such organic matter will produce silica particles after high-temperature incineration. As the system continues to operate, the above particles gradually accumulate and adhere to the surface of the heat exchange element, which will block the heat exchange element, resulting in a decrease in heat exchange efficiency, and then the hot air outlet temperature on the cold side cannot reach the designed desorption temperature. On the other hand, it will cause adverse consequences such as decreased adsorption efficiency of the zeolite wheel, excessive exhaust emissions, and increased natural gas consumption.

[0003] However, in the prior art, the incinerator heat exchanger has no corresponding ash cleaning device, and the ash cleaning operation is mainly performed manually when the system is shut down.

[0004] Therefore, an automatic dust cleaning device for heat exchangers is needed to avoid blockage of heat exchange elements and reduce the failure rate of system operation. Utility Model Content

[0005] In view of the shortcomings of the prior art described above, the technical problem to be solved by the utility model is to provide an automatic cleaning device for a tubular heat exchanger and a tubular heat exchanger, so as to solve the problems in the prior art that the incinerator heat exchanger has no corresponding cleaning device, which causes blockage of the heat exchange elements and increased system operation failure rate.

[0006] In order to solve the above technical problems, the utility model provides an automatic ash cleaning device for a tubular heat exchanger, wherein the tubular heat exchanger is used to recover and process the exhaust gas generated by an incinerator, and the tubular heat exchanger comprises a heat exchange cavity connected to the incinerator and a heat exchange element arranged in the heat exchange cavity, and the automatic ash cleaning device comprises:

[0007] An ash hopper is arranged at the bottom of the heat exchange chamber to collect particulate matter generated by high-temperature incineration in the incinerator, and the particulate matter settles freely and rolls to the bottom of the ash hopper;

[0008] An ash storage barrel is connected to the bottom of the ash hopper, and the particulate matter collected by the ash hopper is stored in a purge assembly of the ash storage barrel. The purge assembly includes an air source arranged on the outside of the heat exchange chamber, a nozzle arranged on the inside of the heat exchange chamber, and an air pipe connecting the air source and the nozzle. The nozzle is aimed at the heat exchange element, and the purge assembly is used to purge the particulate matter accumulated and attached to the surface of the heat exchange element, and the blown-off particulate matter is collected and stored through the ash hopper and the ash storage barrel.

[0009] As a more preferred manner, the ash storage barrel is connected to the bottom of the ash hopper through an ash discharge pipe.

[0010] As a more preferred method, a high-temperature pneumatic switch valve is provided on the ash discharge pipe. The high-temperature pneumatic switch valve is designed with internal insulation and is usually in a closed state to reduce heat loss. The high-temperature pneumatic switch valve is opened periodically to automatically discharge the particulate matter into the ash storage bucket.

[0011] As a more preferred embodiment, a star-shaped ash discharge valve is further provided on the ash discharge pipe. The star-shaped ash discharge valve is arranged below the high-temperature pneumatic switch valve. The star-shaped ash discharge valve has an air locking function, which can reduce system air leakage and heat loss.

[0012] As a more preferred embodiment, the automatic cleaning device of the tubular heat exchanger also includes a control system, which is electrically connected to the purge assembly, the high-temperature pneumatic switch valve and the star-shaped ash unloading valve. The nozzle, the high-temperature pneumatic switch valve and the star-shaped ash unloading valve are set with a start and close delay of a certain relative time and are linked to each other through the control system, so that particulate matter can be continuously discharged into the ash storage bucket.

[0013] As a more preferred method, a first temperature sensor is provided on the ash discharge pipe, and the first temperature sensor is used to monitor the gas temperature in the air duct, and to send out a high temperature protection alarm so that operators can handle it in time to avoid safety risks.

[0014] As a more preferred manner, the ash hopper is designed with a slope structure to prevent particles from settling in dead corners.

[0015] In order to solve the above problems, the utility model also provides a tubular heat exchanger, comprising:

[0016] The above-mentioned automatic dust cleaning device;

[0017] The heat exchange chamber is provided with a hot side air inlet, and the hot side air inlet is connected to the incinerator through a hot air inlet pipeline.

[0018] As a more preferred method, the heat exchange chamber is also provided with a cold side air inlet and a cold side air outlet. The cold side air enters the tubular heat exchanger from the cold side air inlet, undergoes heat exchange, and is discharged from the cold side air outlet. The gas discharged from the cold side air outlet carries the heat of the incinerator for subsequent use, which saves energy and is more environmentally friendly.

[0019] As a more preferred embodiment, a high-temperature pneumatic regulating valve is provided on the hot air intake pipe, and a second temperature sensor is provided in the heat exchange chamber. The opening and closing of the high-temperature pneumatic regulating valve and the flow control are controlled according to the temperature data obtained by the second temperature sensor; specifically, when the temperature obtained by the second temperature sensor is higher than the set value, the high-temperature pneumatic regulating valve is controlled to be closed, or the flow of the hot air intake pipe is reduced; when the temperature obtained by the second temperature sensor is lower than the set value, the high-temperature pneumatic regulating valve is opened in time, or the flow of the hot air intake pipe is increased.

[0020] As described above, the automatic ash cleaning device of the tubular heat exchanger and the tubular heat exchanger of the utility model have the following beneficial effects: when the automatic ash cleaning device of the utility model is in use, the heat source transfers heat from the incinerator side to the heat exchange element, and a part of the particulate matter generated by the high-temperature incineration in the incinerator freely settles and rolls to the bottom of the ash hopper under the action of gravity and is stored in the ash storage bucket, and the other part accumulates and adheres to the surface of the heat exchange element. At this time, the heat exchange element is sprayed with a nozzle aimed at the heat exchange element to blow off the particulate matter accumulated and attached to the surface of the heat exchange element, and then the blown-off particulate matter is collected and stored through the ash hopper and the ash storage bucket. At the same time, the ash cleaning effect can be achieved by manually cleaning the ash storage bucket at regular intervals, without the need for the traditional solution which requires the system to be shut down for manual cleaning. The effect is better and the efficiency is higher; the tubular heat exchanger of the utility model uses an automatic cleaning device to blow off the particles accumulated and attached to the surface of the heat exchange element in time, thereby ensuring the thermal efficiency of the heat exchange element, improving energy utilization, being more environmentally friendly and ensuring the long-term stable operation of the system, and reducing the failure rate; the automatic cleaning device of the tubular heat exchanger of the utility model and the tubular heat exchanger clean the particles accumulated and attached to the surface of the heat exchange element in time by setting a purge component, and collect and store them at the same time for unified treatment, thereby improving the cleaning efficiency, ensuring the thermal efficiency of the heat exchange element, improving energy utilization and reducing the system failure rate, and solving the problem that the incinerator heat exchanger in the prior art has no corresponding cleaning device, which causes the heat exchange element to be blocked and the system operation failure rate to increase. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of an embodiment of the automatic dust cleaning device and the tubular heat exchanger of the utility model;

[0022] Figure 2Shown is a schematic diagram of another embodiment of the automatic dust cleaning device and the tubular heat exchanger of the utility model.

[0023] Component number description

[0024] 1 Incinerator

[0025] 2 High temperature pneumatic control valve

[0026] 3 Differential pressure sensor

[0027] 4 Heat exchange chamber

[0028] 5 Trachea

[0029] 6 Hot side air outlet

[0030] 7 Second temperature sensor

[0031] 8 Access door

[0032] 9 Gas source

[0033] 10 Solenoid valve

[0034] 11 Cold side air inlet

[0035] 12 Cold side air outlet

[0036] 13 Ash Hopper

[0037] 14 High temperature pneumatic switch valve

[0038] 15. First temperature sensor

[0039] 16 Star type ash discharge valve

[0040] 17 Ash storage bin

[0041] 18 Heat exchange element

[0042] 19 Heat exchange shell

[0043] 20 Hot side air inlet DETAILED DESCRIPTION

[0044] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0045] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that can be implemented in this utility model, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that can be produced by the utility model and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the utility model. The following detailed description should not be considered restrictive, and the scope of the embodiments of this application is limited only by the claims of the published patents. The terms used here are only for describing specific embodiments and are not intended to limit this application. Spatial related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., can be used in the text to facilitate the description of the relationship between an element or feature shown in the figure and another element or feature.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "hold" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless there is an indication to the contrary in the context. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Exceptions to this definition will only occur when the combination of elements, functions or operations is inherently mutually exclusive in some way.

[0048] As shown in the figure, the utility model provides an automatic ash cleaning device for a tubular heat exchanger, the tubular heat exchanger is used to recover and process the exhaust gas generated by an incinerator 1, the tubular heat exchanger includes a heat exchange chamber 4 connected to the incinerator 1 and a heat exchange element 18 arranged in the heat exchange chamber 4, the automatic ash cleaning device includes:

[0049] An ash hopper 13 is provided at the bottom of the heat exchange chamber 4 to collect particulate matter generated by high-temperature incineration in the incinerator 1. The particulate matter settles freely and rolls down to the bottom of the ash hopper 13;

[0050] An ash storage bucket 17, the ash storage bucket 17 is connected to the bottom of the ash hopper 13, and the particulate matter collected by the ash hopper 13 is stored in the ash storage bucket 17;

[0051] The purge assembly includes an air source 9 arranged on the outside of the heat exchange chamber 4, a nozzle arranged on the inside of the heat exchange chamber 4, and an air pipe 5 connecting the air source 9 and the nozzle. The nozzle is aimed at the heat exchange element 18. The purge assembly is used to purge the particles accumulated and attached to the surface of the heat exchange element 18, and the blown-off particles are collected and stored through the ash hopper 13 and the ash storage bucket 17.

[0052] When the automatic ash cleaning device of the utility model is in use, the heat source transfers heat from the side of the incinerator 1 to the heat exchange element 18. A part of the particulate matter generated by the high-temperature incineration in the incinerator 1 settles freely under the action of gravity and rolls to the bottom of the ash hopper 13 and is stored in the ash storage bucket 17. The other part accumulates and adheres to the surface of the heat exchange element 18. At this time, the heat exchange element 18 is sprayed with a nozzle aimed at the heat exchange element 18 to blow off the particulate matter accumulated and adhered to the surface of the heat exchange element 18, and then the blown-off particulate matter is collected and stored through the ash hopper 13 and the ash storage bucket 17. At the same time, the ash storage bucket 17 only needs to be manually cleaned at regular intervals to achieve the cleaning effect. There is no need for the traditional solution to shut down the system for manual cleaning, and the cleaning effect is better and more efficient.

[0053] As a more preferred manner, the ash storage barrel 17 is connected to the bottom of the ash hopper 13 through an ash discharge pipe.

[0054] As a more preferred method, a high-temperature pneumatic switch valve 14 is provided on the ash discharge pipe. The high-temperature pneumatic switch valve 14 is designed with internal insulation and is usually in a closed state to reduce heat loss. The high-temperature pneumatic switch valve 14 is opened periodically to automatically discharge the particulate matter into the ash storage bucket 17.

[0055] As a more preferred method, a star-shaped ash discharge valve 16 is also provided on the ash discharge pipe. The star-shaped ash discharge valve 16 is arranged below the high-temperature pneumatic switch valve 14. The star-shaped ash discharge valve 16 has an air locking function, which can reduce system air leakage and heat loss.

[0056] As a more preferred embodiment, the automatic cleaning device of the tubular heat exchanger also includes a control system, which is electrically connected to the purge assembly, the high-temperature pneumatic switch valve 14 and the star-shaped ash unloading valve 16. The nozzle, the high-temperature pneumatic switch valve 14 and the star-shaped ash unloading valve 16 are set with a start and close delay of a certain relative time and are linked to each other through the control system, so that particulate matter can be continuously discharged into the ash storage bucket 17.

[0057] In this embodiment, a solenoid valve 10 is also provided on the air pipe 5, and the solenoid valve 10 is electrically connected to the control system. The control system controls the spraying of the nozzle by controlling the on and off of the solenoid valve 10; further, in this embodiment, the gas source 9 adopts a steam drum, and using the steam drum as the gas source 9 is simple, fast, easy to install and relatively low in cost.

[0058] Furthermore, in this embodiment, the heat exchange chamber 4 is also provided with a pressure difference sensor 3 near the thermal measurement of the incinerator 1, and the pressure difference sensor 3 is connected to the control system, so that the hot side pressure difference can be monitored and early-warning alarmed in real time on the human-machine interface, and automatic ash cleaning can also be performed when the pressure difference reaches the set value.

[0059] As a more preferred method, a first temperature sensor 15 is provided on the ash discharge pipe. The first temperature sensor 15 is used to monitor the gas temperature in the air duct, and to send out a high temperature protection alarm so that operators can handle the problem in time to avoid safety risks.

[0060] As a more preferred manner, the ash hopper 13 is designed with a slope structure to prevent particles from settling in dead corners.

[0061] In order to solve the above problems, the utility model also provides a tubular heat exchanger, comprising:

[0062] The above-mentioned automatic dust cleaning device;

[0063] The heat exchange chamber 4 is provided with a hot side air inlet 20 , and the hot side air inlet 20 is connected to the incinerator 1 through a hot air inlet pipe 5 .

[0064] The tubular heat exchanger of the utility model uses an automatic dust cleaning device to promptly blow off the particulate matter accumulated on the surface of the heat exchange element 18, thereby ensuring the thermal efficiency of the heat exchange element 18, improving energy utilization, being more environmentally friendly, and ensuring long-term stable operation of the system and reducing the failure rate.

[0065] As a more preferred method, the heat exchange chamber 4 is also provided with a cold side air inlet 11 and a cold side air outlet 12. The cold side air enters the tubular heat exchanger from the cold side air inlet 11, undergoes heat exchange, and is discharged from the cold side air outlet 12. The gas discharged from the cold side air outlet 12 carries the heat of the incinerator 1 for subsequent use, which saves energy and is more environmentally friendly.

[0066] As a more preferred embodiment, a high-temperature pneumatic regulating valve 2 is provided on the hot air intake pipe 5, and a second temperature sensor 7 is provided in the heat exchange chamber 4. The opening and closing of the high-temperature pneumatic regulating valve 2 and the flow control are controlled according to the temperature data obtained by the second temperature sensor 7; specifically, when the temperature obtained by the second temperature sensor 7 is higher than the set value, the high-temperature pneumatic regulating valve 2 is controlled to be closed, or the flow of the hot air intake pipe 5 is reduced; when the temperature obtained by the second temperature sensor 7 is lower than the set value, the high-temperature pneumatic regulating valve 2 is opened in time, or the flow of the hot air intake pipe 5 is increased.

[0067] Furthermore, in the present embodiment, an inspection door 8 is provided on the top of the heat exchange chamber 4, and the operator can open the inspection door 8 to perform manual deep ash cleaning and maintenance work; further, when the incinerator 1 is in a shutdown state, the high-temperature pneumatic regulating valve 2 is controlled to be closed, and there is no gas flow inside, and then the purge component can be manually opened for automatic backblowing; the solenoid valve 10 can also be opened for spraying by remote operation through the control system to perform ash cleaning, ash unloading and other maintenance work; finally, the inspection door 8 can also be manually opened to perform manual deep ash cleaning and maintenance work. The above-mentioned multiple methods of removing particulate matter correspond to different scenarios, and the operator can select one or more of them for combination as needed, which is flexible and convenient.

[0068] Furthermore, in this embodiment, if Figure 1 As shown, the heat exchange element 18 adopts a heat exchange tube. Using a heat exchange tube as the heat exchange element 18 can ensure the heat exchange efficiency. The heat exchange tube material is simple and easy to obtain, and it is convenient to assemble and maintain;

[0069] Furthermore, in this embodiment, if Figure 1 As shown, the heat exchange chamber 4 is also provided with a hot side air outlet 6. The hot air transferred from the incinerator 1 enters the heat exchange chamber 4 through the hot side air inlet 20 and flows through the heat exchange element 18 for heat exchange, and is finally discharged from the hot side air outlet 6.

[0070] Furthermore, in this embodiment, if Figure 1As shown, the tubular heat exchanger includes a heat exchange shell 19, the heat exchange chamber 4 is arranged in the heat exchange shell 19, and the hot side air inlet 20, the hot side air outlet 6, the cold side air inlet 11, the cold side air outlet 12 and the inspection door 8 are all opened on the heat exchange shell 19; further, the heat exchanger also includes a cold side air inlet pipe 5 and a cold side air outlet pipe 5, and the cold side air inlet pipe 5 and the cold side air outlet pipe 5 are respectively fixed to the hot side air inlet 20 and the cold side air inlet 11 and are connected to the heat exchange chamber 4.

[0071] Furthermore, in this embodiment, if Figure 1 As shown, the heat exchange shell 19 adopts a vertical structure, the heat exchange element 18 is vertically arranged in the heat exchange cavity 4, the hot side air inlet 20 is arranged at the bottom of the heat exchange shell 19 close to the hot side, and the hot side air outlet 6 is arranged at the top of the heat exchange shell 19 close to the hot side. The hot side gas flows from bottom to top and flows through the outside of the heat exchange element 18; the cold side air inlet 11 and the cold side air outlet 12 are arranged in the middle of the heat exchange shell 19 close to the cold side and are connected to the heat exchange element 18, and the cold side air inlet 11 is arranged above the cold side air outlet 12, and the cold side gas flows from top to bottom and flows through the inside of the heat exchange element 18; this structural design of the up and down convection of cold and hot air first helps to fully exchange heat and improve the heat exchange efficiency. At the same time, this vertical structure also helps the sedimentation of particulate matter; as another embodiment, Figure 2 As shown, the heat exchange shell 19 can also adopt a horizontal structure, the heat exchange element 18 is horizontally arranged in the heat exchange cavity 4, the cold side air inlet 11 and the cold side air outlet 12 are respectively arranged at the left end and the right end of the heat exchange shell 19, the cold side gas flows from left to right and flows through the outside of the heat exchange element 18, the hot side air inlet 20 and the hot side air outlet 6 are arranged at the top of the heat exchange shell 19, and are respectively connected to the right end and the left end of the heat exchange element 18, the hot side gas flows from right to left and flows through the inside of the heat exchange element 18, so that the hot side gas goes outside the heat exchanger tube, and the cold side gas goes inside the heat exchanger tube. This structural design of left and right convection of cold and hot air first helps to fully exchange heat and improve heat exchange efficiency. At the same time, the purge component can be arranged on the outside of the heat exchange tube, and the nozzle can spray regularly to make the particles vertically settle to the ash hopper 13 and quickly discharge to the ash storage barrel 17.

[0072] In summary, the automatic ash cleaning device of the tubular heat exchanger and the tubular heat exchanger of the utility model timely clean the particulate matter accumulated and attached to the surface of the heat exchange element 18 by setting a purge component, and collect and store them at the same time for unified treatment, thereby improving the ash cleaning efficiency, ensuring the thermal efficiency of the heat exchange element 18, improving the energy utilization rate and reducing the system failure rate, and solving the problems in the prior art that the heat exchanger of the incinerator 1 has no corresponding ash cleaning device, thereby causing the heat exchange element 18 to be blocked, and the system operation failure rate to increase. Therefore, the utility model effectively overcomes the various shortcomings of the prior art and has a high industrial utilization value.

[0073] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. An automatic ash cleaning device for a tubular heat exchanger, the tubular heat exchanger being used for recovering and treating the waste gas generated by an incinerator (1), the tubular heat exchanger comprising a heat exchange chamber (4) connected to the incinerator (1) and a heat exchange element (18) arranged in the heat exchange chamber (4), characterized in that: The automatic dust cleaning device comprises: An ash hopper (13), the ash hopper (13) being arranged at the bottom of the heat exchange chamber (4) and used for collecting particulate matter generated by high-temperature incineration in the incinerator (1), the particulate matter being freely settled and rolling down to the bottom of the ash hopper (13); An ash storage bucket (17), the ash storage bucket (17) being connected to the bottom of the ash hopper (13), and the particulate matter collected by the ash hopper (13) is stored in the ash storage bucket (17); A purge assembly, the purge assembly comprising an air source (9) arranged outside the heat exchange chamber (4), a nozzle arranged inside the heat exchange chamber (4), and an air pipe (5) connecting the air source (9) and the nozzle, the nozzle being aimed at the heat exchange element (18), the purge assembly being used to purge particulate matter accumulated and attached to the surface of the heat exchange element (18), and the blown-off particulate matter being collected and stored through an ash hopper (13) and an ash storage bucket (17).

2. The automatic dust cleaning device for a tubular heat exchanger according to claim 1, characterized in that: The ash storage barrel (17) is connected to the bottom of the ash hopper (13) via an ash discharge pipe.

3. The automatic dust cleaning device for a tubular heat exchanger according to claim 2 is characterized in that: The ash discharge pipeline is provided with a high-temperature pneumatic switch valve (14). The high-temperature pneumatic switch valve (14) is designed with internal insulation and is usually in a closed state to reduce heat loss. The high-temperature pneumatic switch valve (14) is opened regularly to automatically discharge particulate matter into the ash storage bucket (17).

4. The automatic dust cleaning device for a tubular heat exchanger according to claim 3 is characterized in that: The ash discharge pipeline is also provided with a star-shaped ash discharge valve (16), which is arranged below the high-temperature pneumatic switch valve (14). The star-shaped ash discharge valve (16) has an air locking function, which can reduce system air leakage and heat loss.

5. The automatic dust cleaning device for a tubular heat exchanger according to claim 4 is characterized in that: The automatic dust cleaning device for the tubular heat exchanger also includes a control system, which is electrically connected to the purge assembly, the high-temperature pneumatic switch valve (14) and the star-shaped dust discharge valve (16). The nozzle, the high-temperature pneumatic switch valve (14) and the star-shaped dust discharge valve (16) are set with a start and close delay of a certain relative time and are linked to each other through the control system, so that particulate matter can be continuously discharged into the dust storage bucket (17).

6. The automatic dust cleaning device for a tubular heat exchanger according to claim 2, characterized in that: The ash discharge pipe is provided with a first temperature sensor (15), and the first temperature sensor (15) is used to monitor the gas temperature in the air duct and to generate a high temperature protection alarm.

7. The automatic dust cleaning device for a tubular heat exchanger according to claim 1, characterized in that: The ash hopper (13) is designed with a slope structure to prevent particles from settling in dead corners.

8. A tubular heat exchanger, characterized in that: include: The automatic dust cleaning device according to any one of claims 1 to 7; A heat exchange chamber (4), wherein a hot side air inlet (20) is provided on the heat exchange chamber (4), and the hot side air inlet (20) is connected to the incinerator (1) through a hot air inlet pipeline.

9. The tubular heat exchanger according to claim 8, characterized in that: The heat exchange chamber (4) is also provided with a cold side air inlet (11) and a cold side air outlet (12); cold side air enters the tubular heat exchanger from the cold side air inlet (11), undergoes heat exchange, and is then discharged from the cold side air outlet (12).

10. The tubular heat exchanger according to claim 8, characterized in that: A high-temperature pneumatic regulating valve (2) is arranged on the hot air inlet pipeline, and a second temperature sensor (7) is arranged in the heat exchange chamber (4). The opening and closing of the high-temperature pneumatic regulating valve (2) and the flow control are controlled according to the temperature data obtained by the second temperature sensor (7).

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