A sludge atomizing spray gun, control system and treatment method

Abstract

The present invention discloses a sludge atomizing spray gun, a control system and a treatment method, belonging to the technical field of sludge treatment. The sludge atomizing spray gun includes: a nozzle is provided at the front end of the inner pipe; an air pipe penetrates into the inner pipe, and a high-pressure air joint is connected to the rear end of the air pipe; an air outlet nozzle is provided at the front end of the air pipe; a diffuser is provided at the front end of the air pipe; a spraying channel is formed between the diffuser and the nozzle; an outer pipe is sleeved outside the inner pipe to form a cooling channel. The control system includes: a control unit is electrically connected to a pressure transmitter, a temperature transmitter and each ball valve. The ball valve is used to control the operation of the spray gun. The pressure transmitter detects the material pressure in the spray gun, and the temperature transmitter detects the temperature of the spray gun. The spray gun uses the diffuser to achieve efficient atomization of sludge, increase the spraying area, improve the combustion efficiency, and can adjust the position of the air pipe to control the spraying amount to prevent blockage; the control system can automatically adjust the operation of the spray gun, cool and clean the spray gun to ensure the stable and efficient operation of the spray gun.

Description

Technical Field

[0001] The present invention relates to the technical field of semi-fluid solid waste treatment such as sludge, and particularly relates to a sludge atomizing spray gun, a control system and a treatment method, which are applicable to the treatment of semi-fluid solid waste such as paste solid waste, oily sludge, and waste water such as leachate. Background Art

[0002] In the field of sludge treatment, especially in processes such as sludge incineration, sludge drying and sludge resource utilization, the atomizing spraying technology of sludge is one of the key links. Traditional sludge treatment methods often have problems such as low treatment efficiency, high energy consumption, and large pollution emissions, and cannot meet the requirements of modern environmental protection and efficient treatment. The existing atomizing spray guns have the following problems:

[0003] The nozzle structure adopts a simple conical shape, which cannot form a good cooperation with high-pressure air, and its atomizing effect is limited, making it difficult to achieve an ideal spraying area and combustion efficiency;

[0004] The high temperature generated during the operation of the spray gun will also damage its internal components; when the spray gun is not working, the spray gun needs to be removed to avoid the sludge inside the spray gun from drying and caking, which is cumbersome to operate and inconvenient to use. Summary of the Invention

[0005] In view of the above technical deficiencies, the present invention provides a sludge atomizing spray gun, a control system and a treatment method.

[0006] The present invention adopts the following technical solutions: A sludge atomizing spray gun, comprising:

[0007] An inner tube, with a nozzle provided at the front end of the inner tube, and the rear end of the inner tube is for feeding.

[0008] An air tube, passing through the inner tube, with a high-pressure air joint connected to the rear end of the air tube; a sludge channel is formed between the air tube and the inner tube, and an air outlet nozzle communicating with the sludge channel is provided at the front end of the air tube.

[0009] A diffuser, provided at the front end of the air tube; a spraying channel communicating with the sludge channel is formed between the diffuser and the nozzle.

[0010] An outer tube, sleeved outside the inner tube; a cooling channel is formed between the outer tube and the inner tube, and a cooling air nozzle is connected to the front end of the cooling channel.

[0011] A cooling air joint, communicating with the cooling channel;

[0012] A cleaning air joint and a diluent joint, respectively communicating with the sludge channel.

[0013] Furthermore, the nozzle includes an inner nozzle fixed to the front end of the inner tube and an outer nozzle fixed to the front end of the inner nozzle; the inner wall of the inner nozzle is a tapered cylindrical shape that is wider on the inside and narrower on the outside, and the inner wall of the outer nozzle is a tapered cylindrical shape that is narrower on the inside and wider on the outside; the lower side of the outer nozzle has an outer edge extending outward;

[0014] The front end of the diffuser is a tapered cylindrical shape that mates with the outer nozzle, and evenly distributed flow guide grooves opposite to the inner wall of the outer nozzle are provided on the circumferential surface of the front end of the diffuser.

[0015] The air outlet nozzle includes a guide cylinder, a wind collecting cavity is provided at the front end of the guide cylinder, and a circle of evenly distributed spray air outlets are provided at the front end of the guide cylinder; the spray air outlets are inclined, and the spray air outlets face the spray channel;

[0016] The guide cylinder is slidably installed in the bracket, and the bracket is fixed in the inner tube; the rear end of the guide cylinder is fixedly connected to the air pipe, and an installation hole for installing the diffuser is provided at the center position of the front end of the guide cylinder.

[0017] The rear end of the inner tube is connected with a feed joint, and a bent portion is provided at the rear end of the inner tube, and a sliding seat is fixed to the bent portion;

[0018] The rear end of the air pipe is slidably inserted through the sliding seat, and the rear end of the air pipe is connected with a high-pressure air joint;

[0019] A regulating nut is rotatably installed on the sliding seat, an external thread section is provided at the rear end of the air pipe, the regulating nut is connected to the threaded section of the air pipe, and a locking nut for positioning the regulating nut is also installed on the threaded section of the air pipe.

[0020] The outer tube is a heat-insulating tube, and the rear end of the outer tube abuts against the step on the inner tube; the cooling air nozzle is in a circular ring shape, and a circle of evenly distributed small holes are provided on the inner tube; the cooling air nozzle is embedded and supported at the front end of the outer tube, and the cooling air nozzle is fixed to the nozzle at the front end of the inner tube by threads.

[0021] A flange is sleeved and fixed on the outer tube; the cooling air joint is inserted through the outer tube, and the cleaning air joint and the diluent joint are inserted through the outer tube and the inner tube.

[0022] A control system:

[0023] The control unit is electrically connected to a first ball valve, a second ball valve, a third ball valve, a fourth ball valve, a pressure transmitter and a temperature transmitter; the pressure transmitter is used to detect the material pressure in the inner tube; the temperature transmitter is used to detect the temperature in the outer tube;

[0024] The inlet of the first ball valve is connected to a high-pressure air source, the outlet of the first ball valve is connected with a first check valve, and the other end of the first check valve is connected to the high-pressure air joint;

[0025] The inlet of the second ball valve is connected to a high-pressure gas source. The outlet of the second ball valve is connected with a second check valve, and the other end of the second check valve is connected to a cleaning gas joint;

[0026] The inlet of the third ball valve is connected to a diluent source. The outlet of the third ball valve is connected with a third check valve, and the other end of the third check valve is connected to a diluent joint;

[0027] The inlet of the fourth ball valve is connected to a cooling air source. The outlet of the fourth ball valve is connected with a fourth check valve, and the other end of the fourth check valve is connected to a cooling air joint.

[0028] A sludge treatment method includes the following steps:

[0029] Step 1) Material atomization spraying;

[0030] After the spray gun is turned on, the control unit opens the first ball valve and the fourth ball valve, and closes the second ball valve and the third ball valve; high-pressure gas is ejected from the air outlet nozzle, and cooling air is ejected from the cooling air nozzle; materials are continuously fed into the nozzle from the rear end of the inner pipe, and the materials at the nozzle are continuously atomized and sprayed into the combustion chamber through the spraying channel between the nozzle and the diffuser by the high-pressure gas; the pressure transmitter monitors the material pressure in the inner pipe in real time, and the temperature transmitter monitors the temperature in the outer pipe in real time;

[0031] Step 2) Material dilution;

[0032] When the moisture content of the material decreases, the pressure value detected by the pressure transmitter will increase; when the pressure value exceeds the set high pressure value, the control unit opens the third ball valve, and the diluent enters the sludge channel through the diluent joint to dilute the materials in the sludge channel; after the materials are diluted, the pressure value detected by the pressure transmitter will decrease, and when the pressure value decreases to be lower than the set low pressure value, the control unit closes the third ball valve;

[0033] Step 3) Material cleaning;

[0034] When the spray gun stops operating, the feeding of the inner pipe stops, the control unit opens the third ball valve, and the diluent enters the sludge channel through the diluent joint to dilute the materials in the sludge channel; then the first ball valve is closed, the second ball valve is opened, and the high-pressure gas enters the sludge channel through the cleaning gas joint to eject the diluted materials in the sludge channel from the nozzle, emptying the sludge channel;

[0035] Step 4) Stopping for temperature reduction;

[0036] When the spray gun stops operating for a relatively long time, the control unit opens the second ball valve and the fourth ball valve, and closes the first ball valve and the third ball valve; high-pressure gas enters the sludge passage through the cleaning gas connection to cool the inner pipe and the gas pipe, and cooling air enters the outer pipe through the cooling air connection to cool the outer pipe and the inner pipe; when the temperature detected by the temperature transmitter exceeds the high value of the set temperature, the control unit opens the third ball valve, and the dilution liquid enters the sludge passage through the dilution liquid connection to achieve water-gas mixed cooling of the inner pipe and the gas pipe; when the temperature detected by the temperature transmitter is lower than the low value of the set temperature, the control unit opens the third ball valve.

[0037] Further, the material continuously fed into the rear end of the inner pipe is sludge with a moisture content of 75%-85%;

[0038] The spray gun is embedded in the side wall of the combustion chamber, and the nozzle at the front end of the inner pipe and the cooling air nozzle at the front end of the outer pipe are both connected to the inside of the combustion chamber;

[0039] The dilution liquid is water and / or leachate.

[0040] In step 1, by controlling the position of the gas pipe relative to the inner pipe, the size of the injection channel between the diffuser and the nozzle is changed to adjust the injection material volume and atomization effect; when the injection channel is blocked, the size of the injection channel is enlarged to discharge the blocked material, and then the injection channel is readjusted to the original injection state.

[0041] The beneficial effects of the present invention are as follows:

[0042] Sludge atomizing spray gun; through the interaction of high-pressure gas and sludge in the injection channel formed between the nozzle and the diffuser, and in cooperation with the diversion grooves around the diffuser, efficient atomization of the sludge is achieved, significantly increasing the sludge spraying area, improving the combustion efficiency and treatment effect; by adjusting the position of the gas pipe in the inner pipe, the size of the injection channel can be flexibly changed, thereby adjusting the injection material volume and atomization effect, and can, to a certain extent, cope with the problem of blockage of the injection channel; the cooling channel formed between the outer pipe and the inner pipe, and the design of the cooling air nozzle effectively reduce the temperature during the operation of the spray gun, protect the components inside the spray gun, and extend the service life of the equipment. The cleaning gas connection and the dilution liquid connection can clean the sludge passage with high-pressure gas and dilution liquid during shutdown, avoiding problems of blockage and corrosion caused by material residue.

[0043] Control system; By connecting the control unit to each valve, the automatic control of the working state of the spray gun is realized, which improves the working efficiency and reduces the errors and risks of manual operation. Using a pressure transmitter and a temperature transmitter, the control system can monitor the material pressure in the inner pipe and the temperature in the outer pipe in real time, providing accurate data support for adjusting and protecting the spray gun. According to the detected data, the control system adjusts the states of each valve to realize functions such as material dilution, cleaning, and spray gun cooling, ensuring the stable operation and high efficiency of the spray gun.

[0044] Sludge treatment method; Using a spray gun to atomize and spray sludge, the mixed combustion of sludge with other substances in the combustion chamber is achieved, improving the sludge treatment efficiency. While treating sludge, it reduces the emission of harmful gases and environmental pollution, meeting the environmental protection requirements. When the spray gun stops working, through the cleaning action of the dilution liquid and high-pressure gas, the residue and blockage of sludge in the sludge channel can be effectively avoided, protecting the internal components of the spray gun. Brief Description of the Drawings

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0046] Figure 1 It is the front view of a sludge atomizing spray gun of the present invention.

[0047] Figure 2 It is the top view of a sludge atomizing spray gun of the present invention.

[0048] Figure 3 It is the front view of the air outlet nozzle in the present invention.

[0049] Figure 4 It is the left view of the air outlet nozzle in the present invention.

[0050] Figure 5 It is the front view of the diffuser in the present invention.

[0051] Figure 6 It is the left view of the diffuser in the present invention.

[0052] Figure 7 It is the front view of the cooling air nozzle in the present invention.

[0053] Figure 8 It is the schematic diagram of the principle of a control system of the present invention.

[0054] Figure 9 It is the schematic diagram of the installation structure of a pressure sensor in the present invention.

[0055] Description of the reference numerals in the drawings: 1. Outer nozzle; 2. Cooling air nozzle; 3. Inner nozzle; 4. Inner pipe; 401. Slide seat; 5. Outer pipe; 6. Flange; 7. Cleaning air joint; 8. Adjusting nut; 9. Locking nut; 10. Diffuser; 101. Flow guiding groove; 11. Air outlet nozzle; 111. Guide cylinder; 112. Air collecting cavity; 113. Jet orifice; 114. Bracket; 115. Mounting hole; 12. Air pipe; 13. Temperature transmitter; 14. Feed joint; 15. Pressure transmitter; 16. High-pressure air joint; 17. Cooling air joint; 18. Diluent joint;

[0056] 19. Control unit; 20. High-pressure air source; 21. Diluent source; 22. Cooling air source;

[0057] 31. First ball valve; 32. Second ball valve; 33. Third ball valve; 34. Fourth ball valve;

[0058] 41. First check valve; 42. Second check valve; 43. Third check valve; 44. Fourth check valve;

[0059] 51. Outer sleeve; 511. Boss; 512. Circlips for hole; 52. Intake hose; 53. Core pipe; 54. Pressure sensor probe; 55. Inner sleeve; 551. Step; 56. Air duct; 57. Spring; 58. Plugging sleeve. Detailed implementation manners

[0060] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0061] Embodiment 1:

[0062] As Figure 1 、 Figure 2 shown, the present invention provides a sludge atomizing spray gun. The rear end of the inner pipe 4 has a bent portion, and a slide seat 401 is fixed to the bent portion. The rear end of the inner pipe 4 is fixedly connected with a feed joint 14 for connecting a feed system. The front end of the inner pipe 4 is fixed with a nozzle, and the nozzle includes an inner nozzle 3 and an outer nozzle 1; the inner nozzle 3 is welded to the front end of the inner pipe 4, and the inner wall of the inner nozzle 3 is a tapered cylindrical shape with a wider inner diameter and a narrower outer diameter; the outer nozzle 1 is welded to the front end of the inner nozzle 3, and the inner wall of the outer nozzle 1 is a tapered cylindrical shape with a narrower inner diameter and a wider outer diameter, and the inner wall of the outer nozzle 1 is smoothly transitioned with the inner wall of the inner nozzle 3. There is an outer edge extending outward on the lower side of the outer nozzle 1.

[0063] The air pipe 12 is disposed through the axis of the inner pipe 4. The rear end of the air pipe 12 is slidably disposed through the sliding seat 401. The air pipe 12 can axially slide in the sliding seat 401 to facilitate adjusting the position of the front end of the air pipe 12 in the inner pipe 4. An adjusting nut 8 is rotatably mounted on the sliding seat 401. A section of external thread is provided at the rear end of the air pipe 12. The adjusting nut 8 is in threaded connection with the threaded section of the air pipe 12. A locking nut 9 is further mounted on the threaded section of the air pipe 12 for positioning the adjusting nut 8. The adjusting nut 8 is axially restricted by the sliding seat 401, and the air pipe 12 is non-rotatable relative to the sliding seat 401; when it is necessary to adjust the position of the air pipe 12, the adjusting nut 8 can be rotated, thereby pushing the air pipe 12 to extend into or out of the inner pipe 4. After adjustment, the locking nut 9 is pressed against the adjusting nut 8.

[0064] The rear end of the air pipe 12 is connected with a high-pressure air joint 16. A sludge channel is formed between the air pipe 12 and the inner pipe 4. The front end of the sludge channel communicates with the inner nozzle 3. The front end of the air pipe 12 is connected with an air outlet nozzle 11. The front end of the air outlet nozzle 11 is connected with a diffuser 10. A jet channel is formed between the diffuser 10 and the outer nozzle 1. The gas ejected from the air outlet nozzle 11 is opposite to the jet channel.

[0065] Combined Figures 1 to 4 As shown, the air outlet nozzle 11 includes a guiding cylinder 111. The guiding cylinder 111 is slidably mounted in the bracket 114. The bracket 114 is fixed on the inner wall of the inner pipe 4. The front end of the guiding cylinder 111 has a wind collecting cavity 112. A circle of uniformly distributed inclined jet air outlets 113 are provided at the front end of the wind collecting cavity 112. The jet air outlets 113 face the jet channel. An installation hole 115 is provided at the center position of the front end of the guiding cylinder 111 for installing the diffuser 10.

[0066] Combined with Figure 5 and Figure 6 As shown, the rear end of the diffuser 10 is cylindrical. The rear end of the diffuser 10 is embedded and fixed in the installation hole 115 at the front end of the guiding cylinder 111. The circumferential surface of the front end of the diffuser 10 is a conical cylinder shape that matches the outer nozzle 1. A circle of uniformly distributed diversion grooves 101 are provided on the circumferential surface of the conical cylinder section. By adjusting the position of the air pipe 12, the gap size between the diffuser 10 and the outer nozzle 1 can be controlled.

[0067] As Figure 1 , Figure 2 and Figure 7 As shown, the outer pipe 5 is a heat-insulating pipe, which is sleeved outside the inner pipe 4. A flange 6 is fixedly sleeved on the outer pipe 5 for fixing the spray gun. A cooling channel is formed between the outer pipe 5 and the inner pipe 4. The rear end of the outer pipe 5 abuts against the step on the inner pipe 4. The annular cooling air nozzle 2 is embedded and supported at the front end of the outer pipe 5 and is fixed on the inner nozzle 3 at the front end of the inner pipe 4 by threads.

[0068] The cooling air connector 17 is installed in the outer tube 5 and is connected to the cooling channel. The cleaning air connector 7 and the diluent connector 18 penetrate through the outer tube 5 and the inner tube 4 and are respectively connected to the sludge channel. The pressure transmitter 15 is installed on the inner tube 4 for detecting the material pressure in the inner tube 4. The temperature transmitter 13 is installed on the outer tube 5 for detecting the temperature in the outer tube 5, which serves as the reference temperature of the entire spray gun.

[0069] Embodiment 2:

[0070] Based on the above Embodiment 1, in combination with Figure 8 As shown, the present invention provides a control system for controlling a spray gun. The control system includes a control unit 19, and the control unit 19 is electrically connected to the first ball valve 31, the second ball valve 32, the third ball valve 33, the fourth ball valve 34, the pressure transmitter 15, and the temperature transmitter 13 respectively. The inlet of the first ball valve 31 is connected to the high-pressure gas source 20, and the high-pressure gas source 20 provides high-pressure air. The outlet of the first ball valve 31 is connected with a first check valve 41, and the other end of the first check valve 41 is connected to the high-pressure gas connector 16. The inlet of the second ball valve 32 is connected to the high-pressure gas source 20, the outlet of the second ball valve 32 is connected with a second check valve 42, and the other end of the second check valve 42 is connected to the cleaning air connector 7. The inlet of the third ball valve 33 is connected to the diluent source 21, and the diluent source 21 provides water and / or leachate. The outlet of the third ball valve 33 is connected with a third check valve 43, and the other end of the third check valve 43 is connected to the diluent connector 18. The inlet of the fourth ball valve 34 is connected to the cooling air source 22, and the cooling air source 22 provides cooling air. The outlet of the fourth ball valve 34 is connected with a fourth check valve 44, and the other end of the fourth check valve 44 is connected to the cooling air connector 17.

[0071] Embodiment 3:

[0072] Based on the above Embodiment 2, the present invention provides a sludge treatment method, including the following steps:

[0073] The spray gun is embedded on the side wall of the combustion chamber, and the nozzle at the front end of the inner tube 4 and the cooling air nozzle 2 at the front end of the outer tube 5 are both connected to the inside of the combustion chamber; the combustion chamber can be a waste incinerator, a coal-fired furnace, etc.;

[0074] Step 1, material atomization spraying;

[0075] After the spray gun is turned on, the control unit 19 opens the first ball valve 31 and the fourth ball valve 34, and closes the second ball valve 32 and the third ball valve 33; high-pressure air is ejected from the air outlet nozzle 11, and cooling air is ejected from the cooling air nozzle 2; materials are continuously fed into the nozzle from the rear end of the inner pipe 4, and the materials at the nozzle are atomized and sprayed through the spraying channel between the nozzle and the diffuser 10 by high-pressure air, and continuously injected into the combustion chamber to burn the materials. During the working process, the spray gun is cooled by the materials and the cooling air. The pressure transmitter 15 monitors the material pressure in the inner pipe 4 in real time, and the temperature transmitter 13 monitors the temperature in the outer pipe 5 in real time.

[0076] The rear end of the inner pipe 4 is continuously fed through a plunger pump conveying system. The material is sludge with a water content of about 80%. The sludge can be semi-fluid solid wastes such as paste solid waste, oily sludge, and waste water materials such as leachate.

[0077] Step 2: Material dilution;

[0078] When the water content of the material decreases, the pressure value detected by the pressure transmitter 15 will increase; when the pressure value exceeds the set high pressure value, the high pressure value is 0.2 - 0.25 mpa, the control unit 19 opens the third ball valve 33, and the diluent enters the sludge channel through the diluent joint 18 to dilute the material in the sludge channel; after the material is diluted, the pressure value detected by the pressure transmitter 15 will decrease. When the pressure value decreases to below the set low pressure value, the low pressure value is 0.05 - 0.1 mpa, the control unit 19 closes the third ball valve 33 to stop the material dilution. The diluent can be the leachate in the garbage, making the waste treatment more thorough and environmentally friendly.

[0079] Step 3: Material cleaning;

[0080] When the spray gun stops, the feeding of the inner pipe 4 stops. The control unit 19 opens the third ball valve 33, and the diluent enters the sludge channel through the diluent joint 18 to dilute the material in the sludge channel; then the first ball valve 31 is closed, the second ball valve 32 is opened, and high-pressure air enters the sludge channel through the cleaning air joint 7 to eject the diluted material in the sludge channel from the nozzle, emptying the sludge channel to prevent the material from losing water at high temperature in the spray gun and blocking the spray gun.

[0081] Step 4: Cooling down when stopping;

[0082] When the spray gun stops operating for a long time, the control unit 19 opens the second ball valve 32 and the fourth ball valve 34, and closes the first ball valve 31 and the third ball valve 33; high-pressure gas enters the sludge passage through the cleaning gas connector 7 to cool the inner tube 4 and the gas pipe 12, and the cooling air enters the outer tube 5 through the cooling air connector 17 to cool the outer tube 5 and the inner tube 4; when the temperature detected by the temperature transmitter 13 exceeds the high set temperature value, the high set temperature value is 500 - 600 °C, the control unit 19 opens the third ball valve 33, and the dilution liquid enters the sludge passage through the dilution liquid connector 18 to achieve water and gas mixed cooling for the inner tube 4 and the gas pipe 12; when the temperature detected by the temperature transmitter 13 is lower than the low set temperature value, the low set temperature value is 300 - 400 °C, the control unit 19 opens the third ball valve 33.

[0083] In addition, during the working process, by controlling the position of the gas pipe 12 relative to the inner tube 4, the size of the gap of the injection channel between the diffuser 10 and the nozzle is changed to adjust the injection material amount and the atomization effect;

[0084] When larger particulate matter accidentally enters the spray gun and cannot be ejected through the nozzle, the blocked material is discharged by enlarging the size of the injection channel, and then the injection channel is readjusted to the original injection state.

[0085] Embodiment 4:

[0086] The probe of the pressure transmitter 15 is located in the inner tube 4. After working for a long time, it is easily blocked by sludge, affecting the detection accuracy. For this reason, this embodiment provides an installation structure of a pressure sensor.

[0087] Combined with Figure 9 As shown, the outer sleeve 51 is fixed on the inner tube 4. The inner end of the outer sleeve 51 is communicated with the inner tube 4. An air inlet hose 52 is connected to the middle of the outer sleeve 51, and the outer end of the outer sleeve 51 is in a stepped shape. The core tube 53 is sleeved in the outer sleeve 51. The outer end of the core tube 53 is fixedly connected with the outer end of the outer sleeve 51 through a flange and sealed; a pressure sensor probe 54 is fixed inside the core tube 53, and the inner end of the pressure sensor probe 54 is flush with the inner end of the core tube 53; an inner sleeve 55 is slidably sleeved outside the core tube 53, and there is a gap between the inner sleeve 55 and the outer sleeve 51, and this gap forms an annular air duct 56 communicated with the air inlet hose 52.

[0088] A spring 57 is installed between the outer end of the inner sleeve 55 and the flange of the outer end of the core tube 53. One side of the inner sleeve 55 close to the outer end also has a step 551 that fits with the inner diameter of the large-diameter section of the outer sleeve 51, and the step 551 separates the spring 57 and the air duct 56.

[0089] A sealing sleeve 58 is sleeved between the inner ends of the outer sleeve 51 and the core pipe 53. The inner end of the outer sleeve 51 has a boss 511 for limiting the inner end of the sealing sleeve 58 and a snap ring for holes 512 for limiting the outer end of the sealing sleeve 58. The sealing sleeve 58 can move slightly between the boss 511 and the snap ring for holes 512. The inner ends of the inner sleeve 55 and the core pipe 53 are both conical, and the inner wall of the outer sleeve 51 is a second-order cone that mates with the inner end of the inner sleeve 55 and the inner end of the core pipe 53.

[0090] As Figure 9 shown, during operation, the fluid flowing in the inner pipe 4 generates pressure on the pressure sensor probe 54, and the pressure sensor probe 54 feeds back the pressure to the control unit 19; at the same time, under the action of the fluid pressure, the sealing sleeve 58 is in a closed state;

[0091] After working for a period of time, high-pressure gas is introduced into the intake hose 52. The airflow pushes the step 551 at the inner end of the inner sleeve 55, compresses the spring 57, and the inner sleeve 55 moves outward to a position where it abuts against the flange at the outer end of the core pipe 53. At the same time, the airflow also pushes the sealing sleeve 58 inward to a position where it abuts against the boss 511. A gap is formed between the sealing sleeve 58, the inner end of the inner sleeve 55, and the inner end of the core pipe 53, and the air duct 56 is opened. The airflow blows towards the inner end of the pressure sensor probe 54 under the guidance of the second-order conical structure on the inner wall of the sealing sleeve 58 to clean the pressure sensor probe 54. The cleaning time can be set to 2 - 5 s.

[0092] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and its equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A sludge atomizing spray gun, characterized in that: include: An inner tube (4), wherein a nozzle is provided at the front end of the inner tube (4), and a rear end of the inner tube (4) is used for feeding; An air pipe (12) is inserted into the inner pipe (4), and a high-pressure air joint (16) is connected to the rear end of the air pipe (12); a sludge channel is formed between the air pipe (12) and the inner pipe (4), and an air outlet nozzle (11) connected to the sludge channel is provided at the front end of the air pipe (12); A diffuser (10) is arranged at the front end of the air pipe (12); an annular gap-type injection channel connected to the sludge channel is formed between the diffuser (10) and the nozzle; An outer tube (5) is sleeved outside the inner tube (4); a cooling channel is formed between the outer tube (5) and the inner tube (4), and a cooling air nozzle (2) is connected to the front end of the cooling channel; A cooling air connector (17) connected to the cooling channel; A cleaning gas connector (7) and a diluent connector (18) are respectively connected to the sludge channel; The nozzle comprises an inner nozzle (3) fixed at the front end of the inner tube (4) and an outer nozzle (1) fixed at the front end of the inner nozzle (3); the inner wall of the inner nozzle (3) is a tapered tube shape that is wide inside and narrow outside, and the inner wall of the outer nozzle (1) is a tapered tube shape that is narrow inside and wide outside; the lower side of the outer nozzle (1) has an outer edge that extends outwards; The front end of the diffuser (10) is in the shape of a cone-shaped cylinder that matches the outer nozzle (1), and the circumferential surface of the front end of the diffuser (10) is provided with evenly distributed guide grooves (101) that are opposite to the inner wall of the outer nozzle (1); The air outlet nozzle (11) comprises a guide tube (111), the front end of the guide tube (111) is provided with an air collecting chamber (112), and the front end of the guide tube (111) is provided with a circle of uniformly distributed injection air outlets (113); the injection air outlets (113) are inclined, and the injection air outlets (113) face the injection channel; The guide tube (111) is slidably mounted in a bracket (114), and the bracket (114) is fixed in the inner tube (4); the rear end of the guide tube (111) is fixedly connected to the air pipe (12), and a mounting hole (115) for mounting the diffuser (10) is provided at the center of the front end of the guide tube (111); The rear end of the inner tube (4) is connected to a feed connector (14), and the rear end of the inner tube (4) has a bent portion, to which a sliding seat (401) is fixed; The rear end of the air pipe (12) is slidably inserted into the sliding seat (401), and the rear end of the air pipe (12) is connected to a high-pressure air joint (16); An adjusting nut (8) is rotatably mounted on the slide seat (401), a section of external thread is provided at the rear end of the air pipe (12), the adjusting nut (8) is connected to the threaded section of the air pipe (12), and a locking nut (9) for positioning the adjusting nut (8) is also mounted on the threaded section of the air pipe (12).

2. A sludge atomizing spray gun according to claim 1, characterized in that: The outer tube (5) is a heat-insulating tube, and the rear end of the outer tube (5) abuts against a step on the inner tube (4); the cooling air nozzle (2) is in a circular ring shape, and the inner tube (4) is provided with small holes evenly distributed around the ring; the cooling air nozzle (2) is embedded and supported at the front end of the outer tube (5), and the cooling air nozzle (2) is fixed to the nozzle at the front end of the inner tube (4) by means of threads.

3. A sludge atomizing spray gun according to claim 1, characterized in that: A flange (6) is sleeved and fixed on the outer tube (5); the cooling air connector (17) is inserted through the outer tube (5); and the cleaning air connector (7) and the diluent connector (18) are inserted through the outer tube (5) and the inner tube (4).

4. A control system for controlling a sludge atomizing spray gun as claimed in any one of claims 1 to 3, characterized in that: The control unit (19) is electrically connected to a first ball valve (31), a second ball valve (32), a third ball valve (33), a fourth ball valve (34), a pressure transmitter (15), and a temperature transmitter (13); the pressure transmitter (15) is used to detect the pressure of the material in the inner tube (4); and the temperature transmitter (13) is used to detect the temperature in the outer tube (5); The inlet of the first ball valve (31) is connected to the high-pressure gas source (20), the outlet of the first ball valve (31) is connected to the first check valve (41), and the other end of the first check valve (41) is connected to the high-pressure gas connector (16); The inlet of the second ball valve (32) is connected to the high-pressure gas source (20), the outlet of the second ball valve (32) is connected to the second check valve (42), and the other end of the second check valve (42) is connected to the cleaning gas connector (7); The inlet of the third ball valve (33) is connected to the diluent source (21), the outlet of the third ball valve (33) is connected to the third check valve (43), and the other end of the third check valve (43) is connected to the diluent connector (18); The inlet of the fourth ball valve (34) is connected to the cooling air source (22), the outlet of the fourth ball valve (34) is connected to the fourth check valve (44), and the other end of the fourth check valve (44) is connected to the cooling air connector (17).

5. A sludge treatment method, using a control system as claimed in claim 4, characterized in that: The steps include: Step 1) material atomization spraying; After the spray gun is turned on, the control unit (19) opens the first ball valve (31) and the fourth ball valve (34), and closes the second ball valve (32) and the third ball valve (33); high-pressure gas is ejected from the air outlet nozzle (11), and cooling air is ejected from the cooling air nozzle (2); the material is continuously fed into the nozzle from the rear end of the inner tube (4), and the material at the nozzle is continuously atomized and sprayed into the combustion chamber through the injection channel between the nozzle and the diffuser (10) by the high-pressure gas; the pressure transmitter (15) monitors the material pressure in the inner tube (4) in real time, and the temperature transmitter (13) monitors the temperature in the outer tube (5) in real time; Step 2) material dilution; When the moisture content of the material decreases, the pressure value detected by the pressure transmitter (15) increases; when the pressure value exceeds the set high pressure value, the control unit (19) opens the third ball valve (33), and the diluent enters the sludge channel through the diluent connector (18) to dilute the material in the sludge channel, and the high pressure value is 0.2-0.25 MPa; after the material is diluted, the pressure value detected by the pressure transmitter (15) decreases, and when the pressure value decreases to below the set low pressure value, the control unit (19) closes the third ball valve (33), and the low pressure value is 0.05-0.1 MPa; Step 3) Material cleaning; When the spray gun is stopped, the inner tube (4) stops feeding, the control unit (19) opens the third ball valve (33), and the diluent enters the sludge channel through the diluent connector (18) to dilute the material in the sludge channel; then the first ball valve (31) is closed, the second ball valve (32) is opened, and the high-pressure gas enters the sludge channel through the cleaning gas connector (7), and the diluted material in the sludge channel is sprayed out from the nozzle to empty the sludge channel; Step 4) Shut down and cool down; When the spray gun is stopped for a long time, the control unit (19) opens the second ball valve (32) and the fourth ball valve (34) and closes the first ball valve (31) and the third ball valve (33); the high-pressure gas enters the sludge channel through the cleaning gas connector (7) to cool the inner tube (4) and the air pipe (12); the cooling air enters the outer tube (5) through the cooling air connector (17) to cool the outer tube (5) and the inner tube (4); when the temperature detected by the temperature transmitter (13) exceeds the set temperature high value, the control unit (19) opens the third ball valve (33), the diluent enters the sludge channel through the diluent connector (18), and water and air mixed cooling is achieved for the inner tube (4) and the air pipe (12); when the temperature detected by the temperature transmitter (13) is lower than the set temperature low value, the control unit (19) closes the third ball valve (33).

6. A sludge treatment method according to claim 5, characterized in that: The material continuously fed into the rear end of the inner tube (4) is sludge with a moisture content of 75%-85%; The spray gun is embedded in the side wall of the combustion chamber, and the nozzle at the front end of the inner tube (4) and the cooling air nozzle (2) at the front end of the outer tube (5) are both connected to the combustion chamber; The diluent is water and / or filtrate.

7. A sludge treatment method according to claim 5, characterized in that: In step 1, the amount of sprayed material and the atomization effect are adjusted by controlling the position of the air pipe (12) relative to the inner pipe (4) and changing the size of the spray channel between the diffuser (10) and the nozzle; when the spray channel is blocked, the blocked material is discharged by expanding the size of the spray channel, and then the spray channel is readjusted to the original spray state.

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