Sludge atomization spray gun, control system and treatment method

Abstract

The invention discloses a sludge atomization spray gun, a control system and a treatment method, and belongs to the technical field of sludge treatment. The sludge atomizing spray gun comprises a nozzle arranged at the front end of an inner pipe; the air pipe penetrates into the inner pipe, and the rear end of the air pipe is connected with a high-pressure air connector; air outlet nozzles are arranged at the front ends of the air pipes; the diffuser is arranged at the front end of the air pipe; a spraying channel is formed between the diffuser and the nozzle; the inner pipe is sleeved with the outer pipe, and a cooling channel is formed. According to the control system, a control unit is electrically connected with a pressure transmitter, a temperature transmitter and all ball valves, the ball valves are used for controlling the spray gun to work, the pressure transmitter detects the pressure of materials in the spray gun, and the temperature transmitter detects the temperature of the spray gun. The spray gun achieves efficient atomization of sludge through the diverging device, the spraying area is increased, the combustion efficiency is improved, the position of an air pipe can be adjusted to control the spraying amount, and blockage is prevented. The control system can automatically adjust the spray gun to work, cool and clean the spray gun, and ensure 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 in particular to a sludge atomizing spray gun, a control system and a treatment method, which are suitable for the treatment of semi-fluid solid waste such as paste solid waste, oil sludge, and wastewater such as leachate. Background Art

[0002] In the field of sludge treatment, especially in the processes of sludge incineration, sludge drying and sludge resource utilization, sludge atomization injection technology 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, which cannot meet the needs of modern environmental protection and efficient treatment. The existing atomization spray guns have the following problems: The nozzle structure adopts a simple cone shape, which cannot form a good match with the high-pressure air, and its atomization effect is limited, making it difficult to achieve the ideal spraying area and combustion efficiency; The high temperature generated by the spray gun during operation will also damage its internal components; when the spray gun is not working, the spray gun needs to be dismantled to avoid the sludge inside the spray gun from drying up, which is cumbersome and inconvenient to use. Summary of the invention

[0003] In view of the above-mentioned technical deficiencies, the present invention provides a sludge atomizing spray gun, a control system and a treatment method.

[0004] The present invention adopts the following technical scheme: a sludge atomizing spray gun, comprising: An inner tube, wherein a nozzle is provided at the front end of the inner tube and a rear end of the inner tube is used for feeding; An air pipe is inserted into the inner pipe, and a high-pressure air joint is connected to the rear end of the air pipe; a sludge channel is formed between the air pipe and the inner pipe, and an air outlet nozzle connected to the sludge channel is arranged at the front end of the air pipe; A diffuser is arranged at the front end of the air pipe; a spray channel connected to the sludge channel is formed between the diffuser and the nozzle; An outer tube is 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; A cooling air connector connected to the cooling channel; The cleaning gas connector and the diluent connector are respectively connected to the sludge channel.

[0005] The nozzle further comprises an inner nozzle fixed at the front end of the inner tube and an outer nozzle fixed at the front end of the inner nozzle; the inner wall of the inner nozzle is a tapered tube with a wide inner side and a narrow outer side, and the inner wall of the outer nozzle is a tapered tube with a narrow inner side and a wide outer side; the lower side of the outer nozzle has an outer edge extending outward; The front end of the diffuser is in a conical cylindrical shape matched with the outer nozzle, and the circumferential surface of the front end of the diffuser is provided with evenly distributed guide grooves opposite to the inner wall of the outer nozzle.

[0006] The air outlet nozzle comprises a guide tube, the front end of which is provided with an air collecting cavity, and the front end of which is provided with a circle of uniformly distributed air injection ports; the air injection ports are inclined and face the injection channel; The guide tube is slidably installed in the bracket, and the bracket is fixed in the inner tube; the rear end of the guide tube is fixedly connected to the air pipe, and a mounting hole for mounting the diffuser is opened at the center of the front end of the guide tube.

[0007] The rear end of the inner tube is connected to a feed joint, and the rear end of the inner tube has a bending portion, and a sliding seat is fixed to the bending portion; The rear end of the air pipe is slidably arranged in the sliding seat, and the rear end of the air pipe is connected to a high-pressure air joint; An adjusting nut is rotatably mounted on the slide seat, a section of external thread is provided at the rear end of the air pipe, the adjusting nut is connected to the threaded section of the air pipe, and a locking nut for positioning the adjusting nut is also mounted on the threaded section of the air pipe.

[0008] The outer tube is an insulation 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 the inner tube is provided with small holes evenly distributed around it; 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.

[0009] A flange is fixedly mounted on the outer tube; the cooling air joint is penetrated on the outer tube, and the cleaning air joint and the diluent joint are penetrated on the outer tube and the inner tube.

[0010] A control system: The control unit is electrically connected to the first ball valve, the second ball valve, the third ball valve, the 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; The inlet of the first ball valve is connected to the high-pressure gas source, the outlet of the first ball valve is connected to the first check valve, and the other end of the first check valve is connected to the high-pressure gas connector; The inlet of the second ball valve is connected to the high-pressure gas source, the outlet of the second ball valve is connected to the second check valve, and the other end of the second check valve is connected to the cleaning gas connector; The inlet of the third ball valve is connected to the diluent source, the outlet of the third ball valve is connected to the third check valve, and the other end of the third check valve is connected to the diluent connector; The inlet of the fourth ball valve is connected to the cooling air source, the outlet of the fourth ball valve is connected to the fourth check valve, and the other end of the fourth check valve is connected to the cooling air connector.

[0011] A sludge treatment method comprises the following steps: Step 1) material atomization spraying; 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; the material is continuously fed from the rear end of the inner tube to the nozzle, 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 by the high-pressure gas; the pressure transmitter monitors the material pressure in the inner tube in real time, and the temperature transmitter monitors the temperature in the outer tube in real time; Step 2) material dilution; 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 connector to dilute the material in the sludge channel; after the material is diluted, the pressure value detected by the pressure transmitter will decrease, and when the pressure value decreases to below the set low pressure value, the control unit closes the third ball valve; Step 3) Material cleaning; When the spray gun stops, the inner tube stops feeding, the control unit opens the third ball valve, and the diluent enters the sludge channel through the diluent connector to dilute the material 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 connector to spray the diluted material in the sludge channel out of the nozzle to empty the sludge channel; Step 4) Shut down and cool down; When the spray gun is shut down for a 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; the high-pressure gas enters the sludge channel through the cleaning gas joint to cool the inner tube and the air pipe, and the cooling air enters the outer tube through the cooling air joint to cool the outer tube and the inner tube; when the temperature detected by the temperature transmitter exceeds the set temperature high value, the control unit opens the third ball valve, and the diluent enters the sludge channel through the diluent joint to achieve water-air mixed cooling of the inner tube and the air pipe; when the temperature detected by the temperature transmitter is lower than the set temperature low value, the control unit opens the third ball valve.

[0012] It is further provided that: the material continuously fed into the rear end of the inner tube 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 and the cooling air nozzle at the front end of the outer tube are both connected to the combustion chamber; The diluent is water and / or filtrate.

[0013] In step 1, the amount of sprayed material and the atomization effect are adjusted by controlling the position of the air pipe relative to the inner pipe and changing the size of the spray channel between the diffuser 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.

[0014] The beneficial effects of the present invention are: Sludge atomizing spray gun; through the interaction between high-pressure gas and sludge in the injection channel formed between the nozzle and the diffuser, combined with the guide grooves around the diffuser, efficient sludge atomization is achieved, the sludge spraying area is significantly increased, and the combustion efficiency and treatment effect are improved; by adjusting the position of the air pipe in the inner pipe, the size of the injection channel can be flexibly changed, thereby adjusting the amount of injection material and the atomization effect, which can deal with the problem of injection channel blockage to a certain extent; the cooling channel formed between the outer pipe and the inner pipe, as well as the design of the cooling air nozzle, effectively reduce the temperature of the spray gun during operation, protect the internal components of the spray gun, and extend the service life of the equipment. The cleaning gas joint and the diluent joint can clean the sludge channel with high-pressure gas and diluent when the machine is shut down, avoiding blockage and corrosion caused by material residues.

[0015] Control system: Through the connection between the control unit and each valve, the automatic control of the working state of the spray gun is realized, which improves the work efficiency and reduces the errors and risks of manual operation. The pressure transmitter and temperature transmitter enable the control system to monitor the material pressure in the inner tube and the temperature in the outer tube in real time, providing accurate data support for adjusting and protecting the spray gun. The control system adjusts the state of each valve according to the detection data to realize the functions of material dilution, cleaning and spray gun cooling, ensuring the stable operation and efficient work of the spray gun.

[0016] Sludge treatment method: The sludge is sprayed by atomizing the spray gun, so that the sludge is mixed with other substances in the combustion chamber and burned, thereby improving the sludge treatment efficiency. While treating the sludge, the emission of harmful gases and environmental pollution are reduced, which meets the environmental protection requirements. When the spray gun is stopped, the cleaning effect of the diluent and high-pressure gas can effectively avoid the residue and blockage of the sludge in the sludge channel, thereby protecting the internal parts of the spray gun. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 The present invention is a front view of a sludge atomizing spray gun.

[0019] Figure 2 The figure is a top view of a sludge atomizing spray gun according to the present invention.

[0020] Figure 3 It is a front view of the air outlet nozzle in the present invention.

[0021] Figure 4It is a left side view of the air outlet nozzle in the present invention.

[0022] Figure 5 It is the front view of the diffuser in the present invention.

[0023] Figure 6 It is a left side view of the diffuser in the present invention.

[0024] Figure 7 It is the front view of the cooling air nozzle in the present invention.

[0025] Figure 8 The figure is a schematic diagram of a control system of the present invention.

[0026] Fig. 9 It is a schematic diagram of the installation structure of a pressure sensor in the present invention.

[0027] Explanation of reference numerals: 1, outer nozzle; 2, cooling air nozzle; 3, inner nozzle; 4, inner tube; 401, slide seat; 5, outer tube; 6, flange; 7, cleaning air joint; 8, adjusting nut; 9, locking nut; 10, diffuser; 101, guide groove; 11, air outlet nozzle; 111, guide cylinder; 112, air collecting chamber; 113, injection air outlet; 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; 19. Control unit; 20. High-pressure gas source; 21. Dilution liquid source; 22. Cooling air source; 31. First ball valve; 32. Second ball valve; 33. Third ball valve; 34. Fourth ball valve; 41. The first check valve; 42. The second check valve; 43. The third check valve; 44. The fourth check valve; 51. Outer sleeve; 511. Boss; 512. Snap ring for hole; 52. Air intake hose; 53. Core tube; 54. Pressure sensor probe; 55. Inner sleeve; 551. Step; 56. Air duct; 57. Spring; 58. Sealing sleeve. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1: like Figure 1 , Figure 2As shown, the present invention provides a sludge atomizing spray gun. The rear end of the inner tube 4 has a bending portion, and a slide seat 401 is fixed to the bending portion. The rear end of the inner tube 4 is fixedly connected to a feed connector 14 for connecting a feed system. The front end of the inner tube 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 tube 4, and the inner wall of the inner nozzle 3 is a tapered cylinder with a wide inside and a narrow outside; 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 cylinder with a narrow inside and a wide outside, and there is a smooth transition between the inner wall of the outer nozzle 1 and the inner wall of the inner nozzle 3. The lower side of the outer nozzle 1 has an outer edge extending outward.

[0030] The air pipe 12 is inserted through the axis of the inner tube 4, and the rear end of the air pipe 12 is slidably inserted through the slide seat 401. The air pipe 12 can slide axially in the slide seat 401 to adjust the position of the front end of the air pipe 12 in the inner tube 4. An adjusting nut 8 is rotatably mounted on the slide seat 401, and a section of external thread is provided at the rear end of the air pipe 12. The adjusting nut 8 is matched and connected with the threaded section of the air pipe 12. A locking nut 9 is also installed on the threaded section of the air pipe 12 to locate the position of the adjusting nut 8. The adjusting nut 8 is limited by the slide seat 401 in the axial direction, and the air pipe 12 cannot rotate relative to the slide seat 401; when the position of the air pipe 12 needs to be adjusted, the adjusting nut 8 can be rotated to push the air pipe 12 into or out of the inner tube 4. After adjustment, the adjusting nut 8 is pushed in by the locking nut 9.

[0031] The rear end of the air pipe 12 is connected to a high-pressure air connector 16, a sludge channel is formed between the air pipe 12 and the inner tube 4, and the front end of the sludge channel is connected to the inner nozzle 3. The front end of the air pipe 12 is connected to an air outlet nozzle 11, and the front end of the air outlet nozzle 11 is connected to a diffuser 10, and an injection channel is formed between the diffuser 10 and the outer nozzle 1, and the gas injected from the air outlet nozzle 11 is opposite to the injection channel.

[0032] Combination Figures 1 to 4 As shown, the air outlet nozzle 11 includes a guide tube 111, which is slidably mounted in a bracket 114, and the bracket 114 is fixed on the inner wall of the inner tube 4. The front end of the guide tube 111 has an air collecting chamber 112, and the front end of the air collecting chamber 112 is provided with a circle of uniformly distributed inclined injection air ports 113, and the injection air ports 113 face the injection channel. A mounting hole 115 is provided at the center of the front end of the guide tube 111 for mounting the diffuser 10.

[0033] Recombination Figure 5 and Figure 6 As shown, the rear end of the diffuser 10 is cylindrical, and the rear end of the diffuser 10 is embedded and fixed in the mounting hole 115 at the front end of the guide cylinder 111. The front end circumference of the diffuser 10 is a conical cylinder that matches the outer nozzle 1, and the circumferential surface of the conical cylinder section is provided with uniformly distributed guide grooves 101. By adjusting the position of the air pipe 12, the size of the gap between the diffuser 10 and the outer nozzle 1 can be controlled.

[0034] like Figure 1 , Figure 2 and Figure 7 As shown, the outer tube 5 is a heat preservation tube, which is sleeved outside the inner tube 4. A flange 6 is fixed on the outer tube 5 for fixing the spray gun. A cooling channel is formed between the outer tube 5 and the inner tube 4. The rear end of the outer tube 5 abuts against the step on the inner tube 4, and the annular cooling air nozzle 2 is embedded and supported on the front end of the outer tube 5 and fixed to the inner nozzle 3 at the front end of the inner tube 4 by threads.

[0035] The cooling air connector 17 is installed in the outer tube 5 and connected to the cooling channel. The cleaning air connector 7 and the diluent connector 18 are installed in the outer tube 5 and the inner tube 4 and are connected to the sludge channel respectively. The pressure transmitter 15 is installed on the inner tube 4 to detect the material pressure in the inner tube 4. The temperature transmitter 13 is installed on the outer tube 5 to detect the temperature in the outer tube 5 as the reference temperature of the entire spray gun.

[0036] Embodiment 2: Based on the above embodiment 1, 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 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 inlet of the first ball valve 31 is connected to a 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 to a first check valve 41, and the other end of the first check valve 41 is connected to a high-pressure gas connector 16. The inlet of the second ball valve 32 is connected to the high-pressure gas source 20, and the outlet of the second ball valve 32 is connected to a second check valve 42, and the other end of the second check valve 42 is connected to a cleaning gas connector 7. The inlet of the third ball valve 33 is connected to a diluent source 21, and the diluent source 21 provides water and / or leachate. The outlet of the third ball valve 33 is connected to a third check valve 43, and the other end of the third check valve 43 is connected to a diluent connector 18. The inlet of the fourth ball valve 34 is connected to the cooling air source 22 , which provides cooling air. The outlet of the fourth ball valve 34 is connected to a fourth check valve 44 , and the other end of the fourth check valve 44 is connected to the cooling air connector 17 .

[0037] Embodiment three: Based on the above-mentioned embodiment 2, the present invention provides a sludge treatment method, comprising the following steps: 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 combustion chamber can be a garbage incinerator, a coal-fired furnace, etc.; 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 atomized and sprayed through the injection channel between the nozzle and the diffuser 10 by the high-pressure gas, and continuously injected into the combustion chamber to burn the material. During the working process, the spray gun is cooled by the material and the cooling air, 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.

[0038] The rear end of the inner tube 4 is continuously fed in by a plunger pump delivery system. The material is sludge with a moisture content of about 80%. The sludge can be paste solid waste, semi-fluid solid waste such as oil sludge, and wastewater materials such as leachate.

[0039] Step 2, material dilution; When the moisture 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 connector 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, and 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 material dilution. The diluent can be leachate from the garbage, and the waste treatment is more thorough and environmentally friendly.

[0040] Step 3: Material cleaning; When the spray gun is shut down, 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, and the second ball valve 32 is opened, and the high-pressure gas enters the sludge channel through the cleaning gas connector 7 to spray the diluted material in the sludge channel out of the nozzle to empty the sludge channel, thereby preventing the material from losing water due to high temperature in the spray gun and clogging the spray gun.

[0041] Step 4: Shut down and cool down; When the spray gun is shut down 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, 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 set temperature high value, the temperature high value is 500-600°C, the control unit 19 opens the third ball valve 33, and the diluent enters the sludge channel through the diluent connector 18 to achieve water-gas mixed cooling of 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 temperature low value is 300-400°C, and the control unit 19 opens the third ball valve 33.

[0042] In addition, during operation, 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 gap size of the spray channel between the diffuser 10 and the nozzle; When larger particles are mistakenly introduced into the spray gun and cannot be sprayed out through the nozzle, the blocked material can be discharged by expanding the size of the spray channel, and then the spray channel can be readjusted to the original spraying state.

[0043] Embodiment 4: The probe of the pressure transmitter 15 is located in the inner tube 4. After working for a long time, it is easy to be blocked by mud, which affects the detection accuracy. To this end, this embodiment provides a mounting structure of a pressure sensor.

[0044] Combination Fig. 9 As shown, the outer sleeve 51 is fixed on the inner tube 4, the inner end of the outer sleeve 51 is connected to the inner tube 4, the middle of the outer sleeve 51 is connected to the air intake hose 52, and the outer end of the outer sleeve 51 is stepped. The core tube 53 is sleeved in the outer sleeve 51, and the outer end of the core tube 53 is fixedly connected to the outer end of the outer sleeve 51 through a flange and sealed; a pressure sensor probe 54 is fixed in 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; the inner sleeve 55 is slidably sleeved on the outer side of the core tube 53, and there is a gap between the inner sleeve 55 and the outer sleeve 51, and the gap forms an annular air duct 56 connected to the air intake hose 52.

[0045] A spring 57 is installed between the outer end of the inner sleeve 55 and the flange at the outer end of the core tube 53. The side of the inner sleeve 55 close to the outer end also has a step 551 that matches the inner diameter of the large diameter section of the outer sleeve 51. The step 551 separates the spring 57 and the air duct 56.

[0046] A plugging sleeve 58 is sleeved between the inner end of the outer sleeve 51 and the inner end of the core tube 53. The inner end of the outer sleeve 51 has a boss 511 for limiting the inner end of the plugging sleeve 58 and a hole retaining ring 512 for limiting the outer end of the plugging sleeve 58. The plugging sleeve 58 can move slightly between the boss 511 and the hole retaining ring 512. The inner ends of the inner sleeve 55 and the core tube 53 are both tapered, and the inner wall of the outer sleeve 51 is a second-order cone that matches the inner ends of the inner sleeve 55 and the core tube 53.

[0047] like Fig. 9 As shown, during operation, the fluid flowing in the inner tube 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 plugging sleeve 58 is in a closed state; After working for a period of time, high-pressure gas is introduced into the air intake hose 52, and the airflow pushes the step 551 at the inner end of the inner sleeve 55, squeezing the spring 57, and the inner sleeve 55 moves outward to a position against the flange at the outer end of the core tube 53. At the same time, the airflow also pushes the sealing sleeve 58 to move inward to a position against the boss 511, and a gap is formed between the sealing sleeve 58 and the inner ends of the inner sleeve 55 and the core tube 53. The air duct 56 is opened, and the airflow is guided by the second-order conical structure of the inner wall of the sealing sleeve 58 to blow toward the inner end of the pressure sensor probe 54 to clean the pressure sensor probe 54. The cleaning time can be set to 2-5s.

[0048] 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 their equivalents, the present invention is also intended to include these modifications and variations.

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 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; The cleaning gas connector (7) and the diluent connector (18) are respectively connected to the sludge channel.

2. A sludge atomizing spray gun according to claim 1, characterized in that: 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 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).

3. A sludge atomizing spray gun according to claim 1, characterized in that: 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).

4. The sludge atomizing spray gun according to claim 1, characterized in that: 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).

5. The 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.

6. The 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).

7. A control system for controlling a sludge atomizing spray gun according to any one of claims 1 to 6, 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).

8. A sludge treatment method, using a control system as claimed in claim 7, 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; 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); 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), and the diluent enters the sludge channel through the diluent connector (18) to achieve water-air mixed cooling of 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) opens the third ball valve (33).

9. A sludge treatment method according to claim 8, 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.

10. A sludge treatment method according to claim 8, 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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