Air bubble cleaning device and method for dust accumulation in air preheater

Abstract

The present invention relates to the technical field of air preheater dust cleaning, and in particular to a bubble cleaning device and method for dust accumulation in an air preheater, comprising a raw material unit, the raw material unit comprising a water tank and an air storage tank, and a delivery pump arranged on the water tank; and a mixing unit, the mixing unit comprising a mixing box, a mixing chamber and a driving chamber arranged in the mixing box, an air inlet pipe and a water inlet pipe arranged in the mixing chamber, a mixing component arranged between the water inlet pipe and the air inlet pipe, a driving component arranged in the driving chamber, a spray component arranged in the mixing chamber, and a valve arranged on the air inlet pipe. The bubble cleaning device and method for dust accumulation in an air preheater generates bubbles by mixing liquid and gas, and the bubbles can be attached to different positions of a heat storage element of the air preheater, and the bubbles are broken due to temperature increase or pressure reduction, and the breaking of a large number of bubbles forms impact and vibration to clean the dust accumulation in the air preheater.

Description

Technical Field

[0001] The invention relates to the technical field of air preheater dust cleaning, and in particular to a bubble cleaning device and method for dust accumulation in an air preheater. Background Art

[0002] The air preheater is an air preheater, and its principle is to use the flue gas generated by the combustion of the boiler to heat the air required for combustion. When the air preheater is working, it is easy to be blocked by dust and corroded. As the flue gas temperature decreases, the blockage and corrosion of the heat exchange element of the air preheater caused by ammonium bisulfate become more obvious. The existing technology uses high-pressure water to flush the heat exchange element, which consumes a lot of water during the flushing process, and the flushing effect is not good due to the long flow path of the heat exchange element. For this reason, the present invention provides a bubble cleaning device and method for air preheater dust accumulation. Summary of the invention

[0003] In view of the problem of high water consumption in the above-mentioned existing air preheater dust cleaning, the present invention is proposed.

[0004] Therefore, one of the objects of the present invention is to provide a bubble cleaning device for air preheater dust accumulation, which improves the cleaning efficiency and reduces the water consumption.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a bubble cleaning device for dust accumulation in an air preheater, comprising a raw material unit, the raw material unit comprising a water tank and an air storage tank, and a delivery pump arranged on the water tank; and

[0006] A mixing unit, the mixing unit comprising a mixing box, a mixing chamber and a driving chamber disposed in the mixing box, an air inlet pipe and a water inlet pipe disposed in the mixing chamber, a mixing assembly disposed between the water inlet pipe and the air inlet pipe, a driving assembly disposed in the driving chamber, a spray assembly disposed in the mixing chamber, and a valve disposed on the air inlet pipe;

[0007] The air inlet pipe is connected to the air storage tank, and the water inlet pipe is connected to the water tank.

[0008] As a preferred solution of the bubble cleaning device for dust accumulation in the air preheater of the present invention, the driving assembly includes a driving motor arranged in the driving cavity, a bevel gear 1 arranged at the end of the driving motor, a mounting tube and a mounting shaft rotatably arranged on the inner wall of the driving cavity, a bevel gear 2 arranged on the mounting tube, and a bevel gear 3 arranged on the mounting shaft;

[0009] One end of the installation tube is located in the mixing chamber, and a stirring blade is installed outside the end;

[0010] The installation shaft passes through the installation tube and is connected to the mixing assembly;

[0011] The first bevel gear is meshed with the second bevel gear and the third bevel gear.

[0012] As a preferred solution of the air bubble cleaning device for dust accumulation in the air preheater of the present invention, the air inlet pipe comprises a pipe body 1 arranged in the mixing chamber, and a distribution box 1 arranged at one end of the pipe body and located inside the mixing chamber;

[0013] The water inlet pipe includes a second pipe body disposed in the mixing chamber, and a second distribution box disposed at two ends of the pipe body and located inside the mixing chamber;

[0014] The mixing assembly is rotatably disposed between the first distribution box and the second distribution box;

[0015] The mounting shaft rotates through the distribution box to connect with the mixing assembly.

[0016] As a preferred solution of the air preheater dust accumulation bubble cleaning device of the present invention, wherein: the mixing assembly includes an impact shaft rotatably arranged between the distribution box 1 and the distribution box 2, a threaded cavity 1 and a threaded cavity 2 respectively arranged on both sides of the impact shaft, and a discharge pipe arranged between the threaded cavity 1 and the threaded cavity 2;

[0017] The spiral directions of the threaded cavity 1 and the threaded cavity 2 are opposite, the threaded cavity 1 and the threaded cavity 2 are connected in the middle, and are also connected to the discharge pipe;

[0018] The installation shaft rotates through the distribution box to connect with the impact shaft;

[0019] There are multiple threaded cavities one and two, and the threaded cavities one is communicated with the distribution box one, and the threaded cavities two are communicated with the distribution box two.

[0020] As a preferred solution of the bubble cleaning device for air preheater dust accumulation of the present invention, the injection assembly includes a conduit arranged in the mixing chamber, and a nozzle arranged at the end of the conduit.

[0021] The beneficial effects of the present invention are as follows: the liquid in the water tank and the gas in the gas storage tank are introduced into the mixing chamber for mixing and generating bubbles, which are finally ejected from the nozzle. The bubbles flow with the flue gas generated by the combustion of the boiler, as well as the influence of their own flow velocity and gravity, and adhere to different positions of the heat storage element of the air preheater. The bubbles burst due to increased temperature or reduced pressure, and the bursting of a large number of bubbles forms impact and vibration to clean the dust accumulated in the air preheater.

[0022] Another object of the present invention is to provide a bubble cleaning method for air preheater dust accumulation, which improves cleaning efficiency and reduces water consumption.

[0023] To solve the above technical problems, the present invention provides the following technical solutions: a bubble cleaning method for dust accumulation in an air preheater, comprising: generating bubbles by mixing liquid and gas; spraying the bubbles to contact the dust; and causing the bubbles to burst and vibrate the dust off.

[0024] As a preferred embodiment of the present invention, the air preheater dust cleaning method using bubbles, wherein: the bubbles have the cleaning ability , among which cleaning ability With liquid flow and gas flow Related, in liquid flow Cleaning capacity at constant The specific calculation formula is as follows:

[0025] ,

[0026] in is the effective number of bubbles, is the surface area of ​​a single bubble.

[0027] As a preferred embodiment of the air preheater dust cleaning method of the present invention, the effective number of bubbles is The calculation formula is as follows:

[0028] ,

[0029] in is the theoretical number of bubbles, is the gas flow efficiency factor, is the liquid flow efficiency factor, where the liquid flow Constant, Liquid Flow Efficiency Factor is a specific parameter;

[0030] The theoretical number of bubbles The calculation formula is as follows:

[0031] ,

[0032] in is a constant.

[0033] As a preferred solution of the air preheater dust cleaning method of the present invention, the gas flow efficiency factor The calculation formula is as follows:

[0034] ,

[0035] in is the reference gas volume.

[0036] As a preferred embodiment of the air preheater dust cleaning method of the present invention, the surface area of ​​a single bubble is The calculation formula is as follows:

[0037] ,

[0038] in, is the average volume of bubbles;

[0039] The average volume of bubbles The calculation formula is as follows:

[0040] ,

[0041] in is a constant.

[0042] The beneficial effects of the present invention are as follows: bubbles are generated by mixing liquid and gas, and the bubbles can adhere to different positions of the air preheater heat storage element. When the bubbles burst due to temperature increase or pressure decrease, the bursting of a large number of bubbles will form impact and vibration to clean the dust accumulated in the air preheater. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0044] Figure 1 It is a schematic diagram of the overall structure of the bubble cleaning device for dust accumulation in air preheater of the present invention.

[0045] Figure 2 It is a schematic diagram of the mixing box structure of the bubble cleaning device for air preheater dust accumulation of the present invention.

[0046] Figure 3 It is a schematic diagram of the structure of the driving assembly of the bubble cleaning device for dust accumulation in the air preheater of the present invention.

[0047] Figure 4 It is a schematic diagram of the internal structure of the mixing chamber of the bubble cleaning device for air preheater dust accumulation of the present invention.

[0048] Figure 5 It is a schematic diagram of the structure of the mixing assembly of the bubble cleaning device for air preheater dust accumulation of the present invention.

[0049] Figure 6 This is a schematic diagram of the impact shaft structure of the bubble cleaning device for air preheater dust accumulation according to the present invention.

[0050] In the figure: 100, raw material unit; 101, water tank; 102, gas tank; 103, delivery pump; 200, mixing unit; 201, mixing box; 202, mixing chamber; 203, driving chamber; 204, air inlet pipe; 205, water inlet pipe; 206, mixing assembly; 207, driving assembly; 208, injection assembly; 209, valve; 207a, driving motor; 207b, bevel gear 1; 207c, mounting tube; 207d, mounting shaft; 207e, bevel gear 2; 207f, bevel gear 3; 207g, stirring blade; 204a, tube body 1; 204b, distribution box 1; 205a, tube body 2; 205b, distribution box 2; 206a, impact shaft; 206b, threaded cavity 1; 206c, threaded cavity 2; 206d, discharge pipe; 208a, conduit; 208b, nozzle. DETAILED DESCRIPTION

[0051] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0052] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0053] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0054] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included. Example 1

[0055] Reference Figure 1 and Figure 2 , which is the first embodiment of the present invention, provides a bubble cleaning device for air preheater dust accumulation, which includes a raw material unit 100 and a mixing unit 200.

[0056] The raw material unit 100 includes a water tank 101 and an air tank 102 , and a delivery pump 103 disposed on the water tank 101 , wherein the water tank 101 stores supercooled water, and the air tank 102 stores compressed air.

[0057] The mixing unit 200 includes a mixing box 201, a mixing chamber 202 and a driving chamber 203 arranged in the mixing box 201, the mixing chamber 202 and the driving chamber 203 are separated by a partition, an air inlet pipe 204 and a water inlet pipe 205 are arranged in the mixing chamber 202, a mixing assembly 206 is arranged between the water inlet pipe 205 and the air inlet pipe 204, a driving assembly 207 is arranged in the driving chamber 203, an injection assembly 208 is arranged in the mixing chamber 202, and a valve 209 is arranged on the air inlet pipe 204, the air inlet pipe 204 is connected to the air storage tank 102, and the water inlet pipe 205 is connected to the water tank 101.

[0058] Furthermore, the injection assembly 208 includes a conduit 208a arranged in the mixing chamber 202, and a nozzle 208b arranged at the end of the conduit 208a. The driving assembly 207 can be made of a motor and a driving shaft. The mixing assembly 206 can be made of mixing blades arranged on the driving shaft, and the driving shaft penetrates into the mixing chamber 202 from the driving chamber 203.

[0059] The use process is: the supercooled water and compressed air in the water tank 101 and the gas tank 102 are introduced into the mixing chamber 202, and are mixed to generate bubbles under the operation of the driving component 207 and the mixing component 206, and then the bubbles are sprayed out through the conduit 208a and the nozzle 208b. The bubbles in the nozzle 208b and the conduit 208a are sprayed into the end face of the air preheater. The bubbles flow with the flue gas generated by the combustion of the boiler, as well as the influence of their own flow velocity and gravity, and adhere to different positions of the heat storage element of the air preheater. The bubbles are burst due to the increase in temperature or the decrease in pressure. The bursting of a large number of bubbles forms impact and vibration to clean the dust accumulated in the air preheater. Example 2

[0060] Reference Figure 3-Figure 6 This is the second embodiment of the present invention, which is different from the first embodiment in that: the driving assembly 207 includes a driving motor 207a disposed in the driving cavity 203, a bevel gear 1 207b disposed at the end of the driving motor 207a, a mounting tube 207c and a mounting shaft 207d rotatably disposed on the inner wall of the driving cavity 203, a bevel gear 207e disposed on the mounting tube 207c, and a bevel gear 3 207f disposed on the mounting shaft 207d;

[0061] One end of the installation tube 207c is located in the mixing chamber 202, and a stirring blade 207g is installed on the outer side of the end; wherein the stirring blade 207g can be provided in multiple groups;

[0062] The mounting shaft 207d passes through the mounting tube 207c and is connected to the mixing assembly 206;

[0063] Bevel gear 1 207b is meshed with bevel gear 207e and bevel gear 3 207f, and driving motor 207a drives bevel gear 1 207b to rotate, thereby driving bevel gear 207e and bevel gear 3 207f to rotate at the same time, and then driving mounting tube 207c and mounting shaft 207d to rotate inside mixing chamber 202, and the rotation directions of mounting shaft 207d and mounting tube 207c are opposite, thereby driving mixing assembly 206 and stirring blade 207g to rotate in opposite directions.

[0064] The air inlet pipe 204 includes a pipe body 204a disposed in the mixing chamber 202, and a distribution box 204b disposed at the end of the pipe body 204a and located inside the mixing chamber 202;

[0065] The water inlet pipe 205 includes a second pipe body 205a disposed in the mixing chamber 202, and a second distribution box 205b disposed at the end of the second pipe body 205a and located inside the mixing chamber 202;

[0066] The mixing assembly 206 is rotatably disposed between the distribution box 1 204b and the distribution box 2 205b; the mounting shaft 207d rotates through the distribution box 1 204b to connect with the mixing assembly 206, wherein the gas in the gas storage tank 102 enters the distribution box 1 204b from the tube body 1 204a, and the supercooled water in the water tank 101 enters the distribution box 2 205b through the tube body 205a, and then the gas and the supercooled water simultaneously enter the mixing assembly 206 to be mixed to generate bubbles,

[0067] When the bubbles are discharged from the mixing component 206, they will pass through the rotating stirring blade 207g, and be stirred and mixed again by the stirring blade 207g, and finally flow into the nozzle 208b from the conduit 208a and be sprayed out. Since the mixing component 206 and the stirring blade 207g rotate in opposite directions, the bubbles, supercooled water and air discharged from the mixing component 206 will form a shear stirring effect when they come into contact with the stirring blade 207g, further increasing the bubble generation rate.

[0068] Further, the mixing assembly 206 includes an impact shaft 206a rotatably disposed between the distribution box 1 204b and the distribution box 2 205b, a threaded cavity 1 206b and a threaded cavity 206c disposed on both sides of the impact shaft 206a, and a discharge pipe 206d disposed between the threaded cavity 1 206b and the threaded cavity 206c, wherein the threaded cavity 1 206b is communicated with the distribution box 1 204b, and the threaded cavity 206c is communicated with the distribution box 2 205b;

[0069] The spiral directions of the threaded chamber 1 206b and the threaded chamber 2 206c are opposite, and the threaded chamber 1 206b and the threaded chamber 2 206c are connected in the middle and are also connected to the discharge pipe 206d; the installation shaft 207d rotates to pass through the distribution box 1 204b and is connected to the impact shaft 206a; the gas in the distribution box 1 204b enters the threaded chamber 1 206b and moves toward the discharge pipe 206d, and the supercooled water in the distribution box 205b enters the threaded chamber 206c and moves toward the discharge pipe 206d, and the supercooled water and gas collide at the discharge pipe 206d to generate bubbles and are discharged from the discharge pipe 206d, and the bubbles, supercooled water and air are mixed and moved to the stirring blade 207g and are stirred for the second time by the stirring blade 207g. Since the bubbles, supercooled water and air will be in the same vortex as the rotation direction of the impact shaft 206a when discharged, shear force will be generated when passing through the stirring blade 207g with the opposite rotation direction, thereby increasing the effect of stirring and generating bubbles.

[0070] Furthermore, the spiral directions of the threaded chamber 1 206b and the threaded chamber 2 206c are opposite. When the impact shaft 206a rotates, the gas in the threaded chamber 1 206b and the supercooled water in the threaded chamber 2 206c will accelerate to flow toward the position of the middle discharge pipe 206d, increasing the impact force between the two.

[0071] Furthermore, there are multiple threaded cavities 1 206b and 206c.

[0072] During use: the supercooled water and compressed air in the water tank 101 and the gas storage tank 102 are introduced into the mixing chamber 202, the gas and the supercooled water are first impacted and mixed for the first time on the impact shaft 206a to generate bubbles, and then discharged from the exhaust pipe 206d and further sheared and stirred by the reverse rotating stirring blade 207g when passing through the stirring blade 207g to generate more bubbles, and finally the bubbles are sprayed out through the conduit 208a and the nozzle 208b, and the bubbles in the nozzle 208b and the conduit 208a are sprayed into the end face of the air preheater, and the bubbles flow with the flue gas generated by the combustion of the boiler, as well as the influence of their own flow velocity and gravity, and adhere to different positions of the heat storage element of the air preheater, and the bubbles are burst due to the increase in temperature or the decrease in pressure, and the bursting of a large number of bubbles forms impact and vibration to clean the dust accumulated in the air preheater. Example 3

[0073] As a third embodiment of the present invention, a bubble cleaning method for dust accumulation in an air preheater is provided, the method comprising:

[0074] S1. Bubbles are generated by mixing liquid and gas;

[0075] In the cleaning device, firstly, supercooled water and compressed air need to be prepared. The supercooled water is usually stored in a water tank 101, and the compressed air can be obtained from an existing air storage tank 102 or a temporary air compressor;

[0076] Ensure that the compressed air source is stable and clean, and avoid carrying oil or moisture that will affect the formation of bubbles and the cleaning effect.

[0077] The supercooled water is delivered to the mixing chamber 202 through the delivery pump 103, and the delivery pump 103 provides the necessary pressure and flow rate to ensure that the supercooled water can be fully mixed with the compressed air;

[0078] The compressed air enters the mixing chamber 202 through the air inlet pipe 204 provided with a flow valve 209 and mixes with the supercooled water, thereby generating bubbles.

[0079] S2. by ejecting bubbles into contact with dust;

[0080] In the mixing chamber 202, supercooled water is mixed with compressed air to form a large number of bubbles. The formed bubbles are transported to the outlet of the nozzle 208b through the conduit 208a and are sprayed out. The bubbles flow with the flue gas generated by the combustion of the boiler, as well as the influence of their own flow velocity and gravity, and adhere to different positions of the air preheater heat storage element and come into contact with dust.

[0081] S3. Bubbles burst and the dust falls off due to impact vibration;

[0082] When the bubbles burst due to temperature increase or pressure decrease, the bursting of a large number of bubbles will form impact and vibration to clean the dust accumulated in the air preheater, thereby achieving the purpose of dust cleaning.

[0083] Embodiment 4 is the fourth embodiment of the present invention. This embodiment is different from the third embodiment in that the bubbles generate cleaning ability. , among which cleaning ability With liquid flow and gas flow Related, in liquid flow Cleaning capacity at constant The specific calculation formula is as follows:

[0084] ,

[0085] in is the effective number of bubbles, is the surface area of ​​a single bubble.

[0086] Furthermore, the effective number of bubbles The calculation formula is as follows:

[0087] ,

[0088] in is the theoretical number of bubbles, is the gas flow efficiency factor, is the liquid flow efficiency factor, where the liquid flow Constant, Liquid Flow Efficiency Factor For specific parameters, The value is 0.9.

[0089] Due to the liquid flow is fixed, so the liquid flow There is a fixed effect on cleaning ability, which is called the liquid flow efficiency factor .

[0090] Due to gas flow is changing, so the gas flow The effect on cleaning power varies and its gas flow efficiency factor The calculation formula is as follows:

[0091] ,

[0092] in is the reference gas volume, The value is 300L / min, n is 2, and the gas flow rate is changed So that the current gas flow can be obtained A gas flow efficiency factor under .

[0093] Combined gas flow efficiency factor Liquid Flow Efficiency Factor Theoretical number of bubbles The effective number of bubbles is obtained The theoretical number of bubbles will break during the formation process due to the influence of liquid flow rate and gas flow rate, leaving only the effective number of bubbles. .

[0094] About the theoretical number of bubbles The calculation formula is as follows:

[0095] ,

[0096] in is a constant, The value is 100.

[0097] Furthermore, the bubbles are spherical, and the surface area of ​​a single bubble The calculation formula is as follows:

[0098] ,

[0099] in, is the average volume of bubbles, and the average volume of bubbles The calculation formula is as follows:

[0100] ,

[0101] in is a constant, The value is 50.

[0102] The number of bubbles that will be effective The surface area of ​​a single bubble Combined, we can get the liquid flow rate and gas flow The cleaning power of bubbles .

[0103] Furthermore, the ratio of the gas flow rate to the liquid flow rate is between 1 and 10. =15L / min, liquid flow efficiency factor =0.9, change the liquid flow rate , thus obtaining the cleaning ability The values ​​are as follows:

[0104] ,

[0105] Among them, the gas flow =130L / min, the cleaning capacity is the strongest;

[0106] Optimum gas flow rate =100L / min, the cleaning ability is strong and the gas loss can be saved.

[0107] The remaining structures are the same as those of Example 1.

[0108] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A bubble cleaning device for air preheater dust accumulation, characterized in that: include, A raw material unit (100), the raw material unit (100) comprising a water tank (101) and a gas storage tank (102), and a delivery pump (103) arranged on the water tank (101); and, A mixing unit (200), the mixing unit (200) comprising a mixing box (201), a mixing chamber (202) and a driving chamber (203) arranged in the mixing box (201), an air inlet pipe (204) and a water inlet pipe (205) arranged in the mixing chamber (202), a mixing component (206) arranged between the water inlet pipe (205) and the air inlet pipe (204), a driving component (207) arranged in the driving chamber (203), an injection component (208) arranged in the mixing chamber (202), and a valve (209) arranged on the air inlet pipe (204); The air inlet pipe (204) is connected to the air storage tank (102), and the water inlet pipe (205) is connected to the water tank (101).

2. The air bubble cleaning device for air preheater dust accumulation according to claim 1 is characterized in that: The driving assembly (207) comprises a driving motor (207a) disposed in the driving cavity (203), a bevel gear 1 (207b) disposed at the end of the driving motor (207a), a mounting tube (207c) and a mounting shaft (207d) rotatably disposed on the inner wall of the driving cavity (203), a bevel gear 2 (207e) disposed on the mounting tube (207c), and a bevel gear 3 (207f) disposed on the mounting shaft (207d); One end of the installation tube (207c) is located in the mixing chamber (202), and a stirring blade (207g) is installed on the outside of the end; The installation shaft (207d) passes through the installation tube (207c) and is connected to the mixing assembly (206); The bevel tooth one (207b) is meshed with the bevel tooth two (207e) and the bevel tooth three (207f).

3. The air bubble cleaning device for air preheater dust accumulation according to claim 2 is characterized in that: The air intake pipe (204) comprises a tube body (204a) disposed in the mixing chamber (202), and a distribution box (204b) disposed at the end of the tube body (204a) and located inside the mixing chamber (202); The water inlet pipe (205) comprises a second pipe body (205a) arranged in the mixing chamber (202), and a second distribution box (205b) arranged at the end of the second pipe body (205a) and located inside the mixing chamber (202); The mixing assembly (206) is rotatably disposed between the first distribution box (204b) and the second distribution box (205b); The mounting shaft (207d) rotates through the distribution box 1 (204b) to connect with the mixing assembly (206).

4. The air bubble cleaning device for air preheater dust accumulation according to claim 3 is characterized in that: The mixing assembly (206) comprises an impact shaft (206a) rotatably disposed between the distribution box one (204b) and the distribution box two (205b), a threaded cavity one (206b) and a threaded cavity two (206c) respectively disposed on both sides of the impact shaft (206a), and a discharge pipe (206d) disposed between the threaded cavity one (206b) and the threaded cavity two (206c); The spiral directions of the first threaded cavity (206b) and the second threaded cavity (206c) are opposite, the first threaded cavity (206b) and the second threaded cavity (206c) are connected in the middle, and are also connected to the discharge pipe (206d); The installation shaft (207d) rotates through the distribution box 1 (204b) to connect with the impact shaft (206a); The threaded cavity one (206b) and the threaded cavity two (206c) are provided in plurality. The threaded cavity one (206b) is communicated with the distribution box one (204b), and the threaded cavity two (206c) is communicated with the distribution box two (205b).

5. The bubble cleaning device for air preheater dust accumulation according to any one of claims 1 to 4, characterized in that: The injection assembly (208) comprises a conduit (208a) arranged in the mixing chamber (202), and a nozzle (208b) arranged at the end of the conduit (208a).

6. A cleaning method using the air bubble cleaning device for dust accumulation in an air preheater according to claim 1, characterized in that: include, Bubbles are produced by mixing liquid with gas; By blowing bubbles out to contact the dust; as well as, The bubbles burst and the dust falls off due to impact vibration.

7. The cleaning method of the air preheater dust accumulation cleaning device according to claim 6, characterized in that: The bubbles generate cleaning power , among which cleaning ability With liquid flow and gas flow Related, in liquid flow Cleaning capacity at constant The specific calculation formula is as follows: in is the effective number of bubbles, is the surface area of ​​a single bubble.

8. The cleaning method of the air preheater dust accumulation cleaning device according to claim 7, characterized in that: The effective number of bubbles The calculation formula is as follows: in is the theoretical number of bubbles, is the gas flow efficiency factor, is the liquid flow efficiency factor, where the liquid flow Constant, Liquid Flow Efficiency Factor is a specific parameter; The theoretical number of bubbles The calculation formula is as follows: in is a constant.

9. The cleaning method of the air preheater dust accumulation cleaning device according to claim 8, characterized in that: The gas flow efficiency factor The calculation formula is as follows: in is the reference gas volume.

10. The cleaning method of the air preheater dust accumulation bubble cleaning device according to any one of claims 7 to 9, characterized in that: The surface area of ​​a single bubble The calculation formula is as follows: in, is the average volume of bubbles; The average volume of bubbles The calculation formula is as follows: in is a constant.

Images