Soot blower for air preheater and air preheater

Through the simple structure of soot blowing device, the problem of easy dust blockage of the tube air preheater heat exchange tube is solved, and the low-cost and efficient soot blowing effect is achieved, reducing the risk of equipment failure and downtime.

CN223271295UActive Publication Date: 2025-08-26GUANGDONG BAOLUTAIHUA BIOENERGY CO LTD
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Patent Information

Application Number
CN202422673166.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-11-01
Publication Date
2025-08-26
Estimated Expiration
2034-11-01

AI Technical Summary

Technical Problem

The heat exchange pipes of existing tube air preheaters are prone to blockage of dust, and the soot blowing device is complex and costly, resulting in high risk of boiler shutdown.

Method used

The soot blowing device with a simple structure is adopted, and the soot blowing is carried out through the Venturi effect using compressed gas. It is controlled with the solenoid pulse valve to reduce the use of compressed gas and improve safety and economy.

Benefits of technology

Reduces the total cost of soot blowing devices and air preheaters, improves the economy and operational stability of the equipment, and reduces the risk of failure points and downtime.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of research, development and design of preheating devices, in particular to a soot blower for an air preheater and the air preheater, which comprises an air cabin with an air chamber inside, a first through hole for compressed air to enter the air chamber is arranged at one end of the air cabin, and a second through hole for compressed air to enter the air chamber is arranged at the other end of the air cabin. A first through hole for compressed air to flow out from the air chamber is formed in one end of the air chamber, a second through hole for compressed air to flow out from the air chamber is formed in the other end of the air chamber, and the compressed air enters the air chamber from the first through hole and then flows out from the second through hole. In addition, the total cost of the whole air preheater is controlled, the economical efficiency of equipment is improved, maintenance and replacement are more convenient and faster, due to the fact that the number of formed parts is small, potential fault points are reduced accordingly, the soot blower is more stable and reliable during operation, and economic losses caused by equipment faults are reduced.
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Description

Technical Field

[0001] The utility model relates to the technical field of research, development and design of preheating devices, in particular to a sootblowing device for an air preheater and an air preheater. Background Art

[0002] An air preheater is a preheating device that improves the heat exchange performance of a boiler and reduces heat loss. Its function is to transfer the heat carried by the flue gas discharged from the boiler's tail flue to the air before entering the boiler through heat exchange components, preheating the air to a certain temperature. It is generally divided into three types: plate, rotary, and tubular. Tubular air preheaters have good sealing, high heat transfer efficiency, and are easy to manufacture and process. Therefore, they are mostly used in power station boilers and industrial boilers. However, the heat exchange tubes of tubular air preheaters are easily clogged with dust, difficult to clean, and the flue gas inlet is prone to wear. An effective soot blowing mechanism is required to clean them to avoid boiler shutdown.

[0003] Most common soot blowers on the market are used for rotary air preheaters. Soot blowing for tubular air preheaters often uses shock wave or deflagration soot blowing, which has complex processes and large investments. A simpler and more effective soot blowing mechanism is needed. Therefore, further improvements to the existing technology are needed. Summary of the Invention

[0004] The purpose of the utility model is to provide a soot blowing device for an air preheater designed to solve at least one technical problem in the background technology.

[0005] The purpose of the utility model is to provide an air preheater designed to solve at least one technical problem in the background technology.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following scheme: a sootblowing device for an air preheater includes an air compartment with an air chamber inside, one end of the air compartment is provided with a first through hole for compressed gas to enter the air chamber, and the other end of the air compartment is provided with a second through hole for compressed gas to flow out of the air chamber, and the compressed gas enters the air chamber from the first through hole and then flows out from the second through hole.

[0007] Wherein, the diameter of the first through hole is greater than the diameter of the second through hole.

[0008] The second through holes include one or more groups, and the multiple groups of the second through holes are arranged at intervals.

[0009] Wherein, a blowing pipe for blowing soot is provided on the bottom surface of the air chamber, and the air chamber is connected to the blowing pipe through the second through hole.

[0010] Among them, it includes an electromagnetic pulse valve arranged on the top surface of the air chamber, the electromagnetic pulse valve is provided with an input port for compressed gas to enter and an output port for compressed gas to flow out, and the electromagnetic pulse valve is connected to the air chamber through the cooperation of the output port and the first through hole.

[0011] Among them, it includes a fixing frame arranged on the air chamber, the fixing frame has an air inlet for compressed gas to enter, an air outlet for compressed gas to flow out, and a flow space inside for compressed gas to flow. The fixing frame is connected to the electromagnetic pulse valve through the cooperation of the air outlet and the input port.

[0012] Wherein, the diameter of the blowing pipe is smaller than the diameter of the first through hole and / or the second through hole.

[0013] The input port and the output port are equipped with connecting pipes, and the electromagnetic pulse valve is assembled to the fixing frame and the air chamber through the connecting pipes.

[0014] The air preheater comprises an air preheater body with an opening at the top and a heat exchange tube inside, and a sootblowing device for the air preheater. The air chamber is assembled on the top of the air preheater body and the second through hole is arranged corresponding to the heat exchange tube.

[0015] Wherein, there is a gap between the blowing pipe and the heat exchange pipe.

[0016] The advantages of the present invention are: the structure and process of the present application are relatively simple, which directly reduces the cost of the sootblowing device itself, and also enables the total cost of the entire air preheater to be controlled, thereby improving the economy of the equipment, and making maintenance and replacement more convenient. Since there are fewer components, the potential failure points are also reduced, which makes the sootblowing device more stable and reliable during operation, reducing the economic losses caused by equipment failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the sootblowing device Figure 1 ;

[0018] Figure 2 It is a structural diagram of the fixing frame and the solenoid valve;

[0019] Figure 3 This is a schematic diagram of the structure of the air chamber Figure 1 ;

[0020] Figure 4 This is a schematic diagram of the structure of the air chamber Figure 2 ;

[0021] Figure 5 It is a schematic diagram of the structure of the stopper;

[0022] Figure 6 It is a structural diagram of the fixed frame;

[0023] Figure 7 yes Figure 6 Schematic cross-section of the middle AA;

[0024] Figure 8 It is a structural diagram of the solenoid valve;

[0025] Figure 9 This is a schematic diagram of the structure of the sootblowing device Figure 2 ;

[0026] Figure 10 It is a structural diagram of an air preheater;

[0027] Figure 11 This is a schematic diagram of the structure of the sootblowing device Figure 3 ;

[0028] Figure 12 It is a structural diagram of the air preheater body. DETAILED DESCRIPTION

[0029] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that each technical feature and the overall technical solution of the present invention can be understood intuitively and vividly, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0030] In the description of this utility model, if there is a description of a direction, such as "upper", "lower", "front", "back", "left", "right", etc., indicating a direction or position relationship, it is based on the direction or position relationship shown in the drawings. It is only for the convenience of describing this utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, it should not be understood as a limitation on this utility model. When a feature is referred to as being "disposed", "fixed", or "connected" to another feature, it can be directly disposed, fixed, or connected to the other feature, or indirectly disposed, fixed, or connected to the other feature.

[0031] In the description of this utility model, if "several" is mentioned, it means one or more; if "multiple" is mentioned, it means more than two; if "greater than," "less than," or "exceeds," it should be understood as excluding the number itself; if "above," "below," or "within" is mentioned, it should be understood as including the number itself. If "first" or "second" is mentioned, it should be understood as distinguishing technical features and should not be understood as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0032] In addition, unless otherwise defined, the technical and scientific terms used in this utility model have the same meanings as those commonly understood by those skilled in the art. The terms used in this utility model are only for describing specific embodiments and are not intended to limit the utility model. It should be understood that when used in this specification and the appended claims, the terms "include" and "comprise" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0033] Example 1: Figure 1-12 As shown, a sootblowing device for an air preheater comprises an air chamber 1 with an air chamber 10 therein, one end of the air chamber 10 is provided with a first through hole 101 for compressed gas to enter the air chamber 10, and the other end of the air chamber 10 is provided with a second through hole 102 for compressed gas to flow out of the air chamber 10, the compressed gas enters the air chamber 10 from the first through hole 101 and then flows out from the second through hole 102. The structure and process of the present application are relatively simple, which directly reduces the cost of the sootblowing device itself, and also controls the total cost of the entire air preheater, improves the economy of the equipment, and is more convenient in maintenance and replacement. Since there are fewer components, the potential failure points are also reduced, which makes the sootblowing device more stable and reliable during operation, and reduces the economic losses caused by equipment failure.

[0034] Among them, the diameter of the first through hole 101 is larger than the diameter of the second through hole 102, and compressed gas is used as the power to blow the heat exchange tube by utilizing the Venturi effect, that is, when the fluid passes through a reduced flow section, its flow rate is inversely proportional to the area of ​​the flow section. The narrower the channel, the faster the fluid flow rate. The increase in flow rate is accompanied by a decrease in fluid pressure, thereby generating an adsorption effect. Compared with shock wave soot blowing, the use of compressed gas is reduced. Compared with acetylene explosion soot blowing, the use cost is reduced and the safety during use is improved.

[0035] Among them, the second through holes 102 have one or more groups, and the multiple groups of second through holes 102 are arranged at intervals. The multiple groups of second through holes can be equipped with more blowpipes to blow soot on the heat exchange tubes, thereby improving efficiency. The compressed gas is distributed to the multiple blowpipes through the air chamber. Compared with shock wave soot blowing, the use of compressed gas is reduced. Compared with acetylene explosion soot blowing, the use cost is reduced and the use safety is improved.

[0036] The air chamber 1 includes a blowpipe 3 for soot blowing arranged on the bottom surface of the air chamber 1. The air chamber 1 is connected to the blowpipe 3 through the second through hole 102. The blowpipe is arranged to blow soot on the heat exchange tube.

[0037] Among them, the diameter of the blow pipe 3 is smaller than the diameter of the first through hole 101 and / or the second through hole 102, and the blow pipe 3 is at least partially inserted in the second through hole 102. Compressed gas is used as the power, and the Venturi effect is used, that is, when the fluid passes through a reduced flow section, its flow rate is inversely proportional to the area of ​​the flow section to blow the heat exchange tube. The narrower the channel, the faster the fluid flow rate. The increase in flow rate is accompanied by a decrease in fluid pressure, thereby producing an adsorption effect. Compared with shock wave soot blowing, the use of compressed gas is reduced. Compared with acetylene explosion soot blowing, the use cost is reduced and the safety during use is improved. In addition, the blow pipe is inserted in the second through hole, making it difficult for compressed gas to leak.

[0038] Among them, it includes an electromagnetic pulse valve 4 arranged on the top surface of the air chamber 1, and the electromagnetic pulse valve 4 is provided with an input port 401 for compressed gas to enter and an output port 402 for compressed gas to flow out. The electromagnetic pulse valve 4 is connected to the air chamber 10 through the cooperation of the output port 402 and the first through hole 101. The electromagnetic pulse valve is used to blow soot to the heat exchange pipe of the air preheater at a regular time to ensure that the heat exchange pipe of the air preheater is not blocked by soot, thereby avoiding shutdown of the furnace and production.

[0039] Among them, it includes a fixing frame 2 arranged on the air chamber 1, the fixing frame 2 has an air inlet 21 for compressed gas to enter, an air outlet 22 for compressed gas to flow out, and a flow space 20 inside for compressed gas to flow. The fixing frame 2 is connected to the electromagnetic pulse valve 4 through the cooperation of the air outlet 2 and the input port 401. The compressed gas enters the flow space 20 from the air inlet 21 and then flows out from the air outlet 22, and then flows into the air chamber 10 through the first through hole 101 and then flows out through the second through hole 102. The fixing frame is set to introduce compressed air into the air chamber.

[0040] The air chamber 10 has one or more groups, and the multiple groups of air chambers 10 are arranged at intervals. The multiple groups of air chambers can be equipped with more blowing pipes to blow soot on the heat exchange tubes, thereby improving the soot blowing efficiency.

[0041] Among them, the input port 401 and the output port 402 are equipped with connecting pipes 41, and the electromagnetic pulse valve is assembled to the fixing frame 2 and the air chamber 1 through the connecting pipes 41. Connecting pipes are assembled at the input port and output port of the electromagnetic pulse valve, so that the compressed gas is not easily leaked when passing through, thereby reducing the loss of compressed gas.

[0042] In which, the air chamber 1 is provided with a fixed pipe 12 corresponding to the connecting pipe 41, the connecting pipe 41 is connected to the fixed pipe 12, and also includes a hose, the connecting pipe 41 is at least partially assembled in the hose, the fixed pipe 12 is at least partially assembled in the hose and is located at one end away from the connecting pipe 41. Fixing the connecting pipe and the fixed pipe together through the hose can further prevent the leakage of compressed gas, reduce the loss of compressed gas, and improve efficiency.

[0043] Example 2: Figure 1-12 As shown, the air preheater includes an air preheater body 5 with an opening at the top and a heat exchange tube 51 inside, and the soot blowing device for the air preheater, the air chamber 1 is assembled on the top of the air preheater body 5 and the second through hole 102 is arranged corresponding to the heat exchange tube 52, the side wall of the air preheater body 5 located above the heat exchange tube 51 is provided with an air inlet 500, the injection pipe 3 is close to the heat exchange tube 51, and there is a gap between the injection pipe 3 and the heat exchange tube 51. The present application adopts compressed gas as the power and utilizes the Venturi effect, that is, when the fluid passes through a reduced flow section, its flow velocity and the area of ​​the flow section are proportional. The heat exchange tubes are blown based on the inversely proportional principle. The narrower the channel, the faster the fluid flow rate. The increase in flow rate is accompanied by a decrease in fluid pressure, which produces an adsorption effect. Compared with shock wave soot blowing, the use of compressed gas is reduced. Compared with acetylene explosion soot blowing, the use cost is reduced and the use safety is improved. The electromagnetic pulse valve is used to blow soot to the heat exchange tubes of the air preheater at a regular time to ensure that the heat exchange tubes of the air preheater are not blocked by soot, avoiding shutdown of the furnace and production. The compressed gas is distributed to the blowpipe through the air chamber inside the air cabin. Under the action of the Venturi effect, when the blowpipe sprays compressed gas into the inside of the heat exchange tube, the air inlet brings a large amount of air into the inside of the heat exchange tube, thereby achieving an ideal cleaning effect.

[0044] The diameter of the blowing pipe 3 is smaller than that of the heat exchange pipe 51 , and the distance between the blowing pipe 3 and the heat exchange pipe 51 is set to 5 times the inner diameter of the heat exchange pipe 51 , so that the blowing pipe can blow soot better.

[0045] It also includes a stopper 52, on which a stopper hole 520 corresponding to the blow pipe 3 is provided. The blow pipe 3 at least partially passes through the stopper hole 520 and is fixed to the stopper 52, so that the blow pipe will not move when blowing out compressed gas.

[0046] In which, the air chamber 1 is provided with a connecting ear for connecting to the air preheater body 5. The air chamber 1 is detachably assembled on the top of the air preheater body through the cooperation of the connecting ear and the bolt, so that the soot blowing device for the air preheater can be removed from the air preheater body.

[0047] Working principle: compressed gas enters the flow space 20 inside the fixed frame 22 through the air inlet 21, flows out from the air outlet 22, and enters the electromagnetic pulse valve 4 from the input port 401 of the solenoid valve through the connecting pipe 41. The electromagnetic pulse valve 4 controls the on and off of the compressed gas. When dust cleaning is required, the electromagnetic pulse valve 4 is opened, and the compressed gas enters the fixed pipe 12 from the output port 402 of the electromagnetic pulse valve 4 through the connecting pipe 41 and then enters the air chamber 10. Finally, the compressed gas is sprayed into the heat exchange tube 51 through the injection pipe 3. Under the action of the Venturi effect, when the injection pipe sprays compressed gas into the inside of the heat exchange tube, the air inlet brings a large amount of air into the inside of the heat exchange tube, thereby achieving an ideal dust cleaning effect.

[0048] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A sootblowing device for an air preheater, comprising an air compartment having an air chamber therein, characterized in that: One end of the air chamber is provided with a first through hole for compressed gas to enter the air chamber, and the other end of the air chamber is provided with a second through hole for compressed gas to flow out of the air chamber. Compressed gas enters the air chamber from the first through hole and then flows out from the second through hole.

2. The sootblowing device for an air preheater according to claim 1, characterized in that: A diameter of the first through hole is greater than a diameter of the second through hole.

3. The sootblowing device for an air preheater according to claim 1, characterized in that: It comprises a blowing pipe arranged on the bottom surface of the air chamber for blowing soot, and the air chamber is connected with the blowing pipe through the second through hole.

4. The sootblowing device for an air preheater according to claim 1, characterized in that: It includes an electromagnetic pulse valve arranged on the top surface of the air chamber, the electromagnetic pulse valve is provided with an input port for compressed gas to enter and an output port for compressed gas to flow out, and the electromagnetic pulse valve is connected to the air chamber through the cooperation of the output port and the first through hole.

5. The sootblowing device for an air preheater according to claim 4, characterized in that: It includes a fixing frame arranged on the air chamber, the fixing frame has an air inlet for compressed gas to enter, an air outlet for compressed gas to flow out, and a flow space inside for compressed gas to flow. The fixing frame is connected to the electromagnetic pulse valve through the cooperation of the air outlet and the input port.

6. The sootblowing device for an air preheater according to claim 3, characterized in that: The diameter of the blowing pipe is smaller than the diameter of the first through hole and / or the second through hole.

7. The sootblowing device for an air preheater according to claim 1, characterized in that: The second through holes include one or more groups, and the multiple groups of the second through holes are arranged at intervals.

8. The sootblowing device for an air preheater according to claim 4, characterized in that: The input port and the output port are equipped with connecting pipes, and the electromagnetic pulse valve is assembled to the fixing frame and the air chamber through the connecting pipes.

9. An air preheater comprising an air preheater body having an opening at the top and heat exchange tubes therein, and a sootblowing device for an air preheater according to any one of claims 1 to 8, characterized in that: The air chamber is assembled on the top of the air preheater body and the second through hole is arranged corresponding to the heat exchange tube.

10. The air preheater according to claim 9, characterized in that: There is a gap between the blowing pipe and the heat exchange pipe.