Efficient treatment device for chemical triple-effect evaporation waste salt
By setting up cleaning components in the chemical three-effect evaporator and cleaning the inner wall with high-pressure nozzles and spiral scrapers, the problem of scaling of high-viscosity materials during evaporation is solved, and the evaporation efficiency and equipment operation stability are improved.
Patent Information
- Application Number
- CN202521417462.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-08
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2035-07-08
AI Technical Summary
When the existing three-effect evaporators treat high viscosity materials, the flow resistance increases, which is prone to scale, affects the evaporation efficiency, and requires frequent cleaning, affecting the normal operation of the equipment.
An efficient treatment device for chemical three-effect evaporation waste salt is designed, including a first evaporator, a second evaporator and a third evaporator, with internal cleaning components, cleaning the inner wall through a high-pressure nozzle and a spiral scraper, and combining with a driving motor to drive the scraper to rotate, realizing internal cleaning.
Improves evaporation efficiency, reduces the equipment cleaning frequency, and ensures the normal operation of the equipment.
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Figure CN223208995U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of waste salt treatment, in particular to a high-efficiency treatment device for waste salt from chemical triple-effect evaporation. Background Art
[0002] As the core equipment for liquid material concentration, the shell-and-tube circulating externally heated evaporator achieves efficient concentration through a unique heat exchange design. Its operating mechanism is based on the synergistic heating of the tube array and forced circulation. The circulating pump drives the material to be processed through the tubes, forming a high-speed flow. The external heat source indirectly heats the outer wall of the tubes, causing the solvent to quickly vaporize and separate, thereby achieving efficient solute concentration.
[0003] When processing high-viscosity materials, the existing triple-effect evaporator has increased flow resistance, which may affect the evaporation efficiency. Materials prone to scaling are prone to form a scale layer on the heating surface during the evaporation process, which reduces the heat transfer coefficient, requires frequent cleaning, and even affects the normal operation of the equipment. Therefore, an efficient treatment device for chemical triple-effect evaporation waste salt is proposed. Utility Model Content
[0004] The purpose of the utility model is to provide a high-efficiency treatment device for chemical triple-effect evaporation waste salt, so as to solve the problems raised in the above background technology.
[0005] To achieve the above-mentioned objectives, the utility model provides a high-efficiency treatment device for chemical triple-effect evaporation waste salt, including a first evaporator, a second evaporator and a third evaporator, the bottom sides of the first evaporator, the second evaporator and the third evaporator are fixedly connected with multiple supporting feet, the first evaporator, the second evaporator and the third evaporator are provided with a first ventilation pipe, a second ventilation pipe, a first feed pipe and a second feed pipe, the first ventilation pipe and the first feed pipe are used for connecting between the first evaporator and the second evaporator, the second ventilation pipe and the second feed pipe are used for connecting between the second evaporator and the third evaporator, and a cleaning component is provided in the first evaporator, the second evaporator and the third evaporator, and multiple cleaning components are used to clean the interior of the first evaporator, the second evaporator and the third evaporator.
[0006] As a further improvement of the present technical solution, the first evaporator includes a first air outlet pipe, the first air outlet pipe is fixedly connected to the top center position of the first evaporator, a first T-shaped connecting pipe is fixedly installed on the top of the first air outlet pipe, a first water outlet pipe is fixedly connected to the bottom center position of the first evaporator, a first T-shaped water outlet pipe is fixedly installed at the bottom end of the first water outlet pipe, a first delivery pump is fixedly installed at the water outlet end of the first T-shaped water outlet pipe, a first water inlet pipe and a first air inlet pipe are fixedly connected to the outside of the first evaporator, a first connecting water inlet pipe is fixedly installed at one end of the first water inlet pipe, and a first connecting air inlet pipe is fixedly installed at one end of the first air inlet pipe.
[0007] As a further improvement of the present technical solution, the second evaporator includes a second air outlet pipe, which is fixedly connected to the center position of the top side of the second evaporator, a second T-shaped connecting pipe is fixedly installed on the top side of the second air outlet pipe, a second water outlet pipe is fixedly connected to the center position of the bottom side of the second evaporator, a second T-shaped water outlet pipe is fixedly installed at the bottom end of the second water outlet pipe, a second delivery pump is fixedly installed at the water outlet end of the second T-shaped water outlet pipe, and a second water inlet pipe and a second air inlet pipe are fixedly connected to the outside of the second evaporator.
[0008] As a further improvement of the present technical solution, the third evaporator includes a third air outlet pipe, which is fixedly connected to the top center position of the third evaporator, and the top of the third air outlet pipe is fixedly connected to a third T-shaped connecting pipe, and the bottom center position of the third evaporator is fixedly connected to a third water outlet pipe, and the outer side of the third evaporator is fixedly connected to a third water inlet pipe and a third air inlet pipe.
[0009] As a further improvement of the present technical solution, one end of the first ventilation pipe is fixedly connected to the outside of the first T-shaped connecting pipe, the other end of the first ventilation pipe is fixedly installed on the second air inlet pipe, one end of the second ventilation pipe is fixedly connected to the outside of the second T-shaped connecting pipe, one end of the second T-shaped connecting pipe is fixedly installed on the third air inlet pipe, one end of the first material delivery pipe is fixedly installed on the first conveying pump, the other end of the first material delivery pipe is fixedly installed on the second water inlet pipe, one end of the second material delivery pipe is fixedly installed on the second conveying pump, and the other end of the second material delivery pipe is fixedly connected to the third water inlet pipe.
[0010] As a further improvement of the present technical solution, each of the cleaning components includes a drive motor, and multiple drive motors are respectively fixedly installed on the top ends of the first T-shaped connecting tube, the second T-shaped connecting tube and the third T-shaped connecting tube. The output shaft ends of multiple drive motors are fixedly connected to a rotating shaft, and the outer sides of multiple rotating shafts are fixedly connected to two connecting rods, and the two connecting rods are symmetrically arranged, and the other ends of the two connecting rods are fixedly connected to a spiral scraper.
[0011] As a further improvement of the present technical solution, two connecting columns are fixedly connected to the top inner walls of the first evaporator, the second evaporator and the third evaporator, and the two connecting columns are symmetrically arranged. The bottom ends of the two connecting columns are fixedly connected to an annular tube, and a plurality of high-pressure nozzles are fixedly installed on the annular tube. The plurality of high-pressure nozzles are inclined outward at a certain degree. A water injection pipe is fixedly connected to the annular tube, and the plurality of water injection pipes pass through the top inner walls of the first evaporator, the second evaporator and the third evaporator and extend to the outside.
[0012] Compared with the prior art, the present invention has the following beneficial effects:
[0013] In a high-efficiency treatment device for chemical triple-effect evaporation waste salt, cleaning components are arranged in the first evaporator, the second evaporator and the third evaporator, so that multiple cleaning components can clean the first evaporator, the second evaporator and the third evaporator. Before cleaning, multiple water injection pipes are externally connected to high-pressure water pumps, and water is injected into the multiple water injection pipes and the multiple annular pipes through the multiple high-pressure water pumps. Then, the inside of the first evaporator, the second evaporator and the third evaporator is cleaned through multiple high-pressure nozzles. At the same time, multiple driving motors drive multiple rotating shafts to rotate, and the rotating shafts drive two spiral scrapers to rotate through two connecting rods, so that the multiple spiral scrapers can scrape off the stains remaining on the inner walls of the first evaporator, the second evaporator and the third evaporator, thereby achieving the effect of cleaning the inside of the first evaporator, the second evaporator and the third evaporator. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is one of the overall structural diagrams of the utility model;
[0015] Figure 2 This is the second schematic diagram of the overall structure of the utility model;
[0016] Figure 3 It is a schematic cross-sectional view of the utility model;
[0017] Figure 4 This is a schematic diagram of the cleaning component structure of the utility model.
[0018] The meaning of each number in the figure is:
[0019] 1. First evaporator; 101. First air outlet pipe; 102. First T-shaped connecting pipe; 103. First water outlet pipe; 104. First T-shaped water outlet pipe; 105. First delivery pump; 106. First water inlet pipe; 107. First air inlet pipe; 108. First connecting water inlet pipe; 109. First connecting air inlet pipe; 2. Second evaporator; 201. Second air outlet pipe; 202. Second T-shaped connecting pipe; 203. Second water outlet pipe; 204. Second T-shaped water outlet pipe; 205. Second delivery pump; 206. Second water inlet pipe ; 207, second air inlet pipe; 3, third evaporator; 301, third air outlet pipe; 302, third T-shaped connecting pipe; 303, third water outlet pipe; 304, third water inlet pipe; 305, third air inlet pipe; 4, first ventilation pipe; 5, second ventilation pipe; 6, first feed pipe; 7, second feed pipe; 8, cleaning component; 801, drive motor; 802, rotating shaft; 803, connecting rod; 804, spiral scraper; 805, connecting column; 806, annular pipe; 807, high-pressure nozzle; 808, water injection pipe. DETAILED DESCRIPTION
[0020] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.
[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0022] See also Figure 1-Figure 4 As shown, this embodiment provides a high-efficiency treatment device for chemical triple-effect evaporation waste salt, including a first evaporator 1, a second evaporator 2 and a third evaporator 3. The bottom sides of the first evaporator 1, the second evaporator 2 and the third evaporator 3 are fixedly connected with multiple supporting feet. The first evaporator 1, the second evaporator 2 and the third evaporator 3 are provided with a first ventilation pipe 4, a second ventilation pipe 5, a first material conveying pipe 6 and a second material conveying pipe 7. The first ventilation pipe 4 and the first material conveying pipe 6 are used for connecting the first evaporator 1 and the second evaporator 2, and the second ventilation pipe 5 and the second material conveying pipe 7 are used for connecting the second evaporator 2 and the third evaporator 3. Cleaning components 8 are provided in the first evaporator 1, the second evaporator 2 and the third evaporator 3, and multiple cleaning components 8 are used to clean the interior of the first evaporator 1, the second evaporator 2 and the third evaporator 3.
[0023] In actual application, the waste salt is subjected to multi-effect evaporation through the first evaporator 1, the second evaporator 2 and the third evaporator 3, and then the first vent pipe 4, the second vent pipe 5, the first feed pipe 6 and the second feed pipe 7 are connected in series, and then the pressure and evaporation temperature of each effect are gradually reduced, thereby realizing multiple utilization of heat energy. At the same time, when the waste salt is evaporated, it is easy for stains to remain on the inner walls of the first evaporator 1, the second evaporator 2 and the third evaporator 3, which will directly affect the evaporation effect. Through the multiple cleaning components 8, the inner walls of the first evaporator 1, the second evaporator 2 and the third evaporator 3 can be scraped and cleaned respectively, thereby improving the evaporation efficiency.
[0024] See also Figure 1-Figure 2 As shown, the first evaporator 1 includes a first air outlet pipe 101, which is fixedly connected to the top center position of the first evaporator 1, and a first T-shaped connecting pipe 102 is fixedly installed on the top of the first air outlet pipe 101, and a first water outlet pipe 103 is fixedly connected to the bottom center position of the first evaporator 1, and a first T-shaped water outlet pipe 104 is fixedly installed at the bottom end of the first water outlet pipe 103, and a first delivery pump 105 is fixedly installed at the water outlet end of the first T-shaped water outlet pipe 104, and a first water inlet pipe 106 and a first air inlet pipe 107 are fixedly connected to the outside of the first evaporator 1, and a first connecting water inlet pipe 108 is fixedly installed on one end of the first water inlet pipe 106, and a first connecting air inlet pipe 109 is fixedly installed on one end of the first air inlet pipe 107.
[0025] In actual application, the waste salt solution is injected into the first evaporator 1 through the first connecting water inlet pipe 108 and the first water inlet pipe 106, and then the steam is injected into the first evaporator 1 through the first connecting air inlet pipe 109 and the first air inlet pipe 107 to heat the waste salt solution, thereby increasing the concentration of the waste salt solution. At the same time, the solution is evaporated by heat to produce secondary steam, and the secondary steam enters the second evaporator 2 through the first air outlet pipe 101, the first T-shaped connecting pipe 102, the first ventilation pipe 4 and the second air inlet pipe 207. At the same time, the waste salt solution evaporated in one effect is injected into the second evaporator 2 through the first water outlet pipe 103, the first T-shaped water outlet pipe 104, the first delivery pump 105, the first material delivery pipe 6 and the second water inlet pipe 206.
[0026] See also Figure 1-Figure 2 As shown, the second evaporator 2 includes a second air outlet pipe 201, which is fixedly connected to the center position of the top side of the second evaporator 2, and a second T-shaped connecting pipe 202 is fixedly installed on the top side of the second air outlet pipe 201. A second water outlet pipe 203 is fixedly connected to the center position of the bottom side of the second evaporator 2, and a second T-shaped water outlet pipe 204 is fixedly installed at the bottom end of the second water outlet pipe 203. A second delivery pump 205 is fixedly installed at the water outlet end of the second T-shaped water outlet pipe 204, and a second water inlet pipe 206 and a second air inlet pipe 207 are fixedly connected to the outside of the second evaporator 2.
[0027] In actual application, the waste salt solution in the second evaporator 2 can be evaporated in a second effect through the steam from the first effect evaporation. At the same time, the steam generated after the second effect evaporation enters the third evaporator 3 through the second outlet pipe 201, the second T-shaped connecting pipe 202, the second ventilation pipe 5 and the third air inlet pipe 305. At the same time, the concentration of the waste liquid solution after the second effect evaporation is further improved. At the same time, the waste salt solution evaporated in the first effect is injected into the third evaporator 3 through the second water outlet pipe 203, the second T-shaped water outlet pipe 204, the second delivery pump 205, the second material delivery pipe 7 and the third water inlet pipe 304 for triple effect evaporation.
[0028] See also Figure 1-Figure 2 As shown, the third evaporator 3 includes a third air outlet pipe 301, which is fixedly connected to the center position of the top side of the third evaporator 3, and the top of the third air outlet pipe 301 is fixedly connected to a third T-shaped connecting pipe 302, and the bottom center position of the third evaporator 3 is fixedly connected to a third water outlet pipe 303, and the outer side of the third evaporator 3 is fixedly connected to a third water inlet pipe 304 and a third air inlet pipe 305.
[0029] In actual application, the waste salt solution in the third evaporator 3 can be evaporated in a triple-effect manner through the steam from the second-effect evaporation. The steam generated by the triple-effect evaporation is discharged through the third air outlet pipe 301 and the third T-shaped connecting pipe 302. At the same time, the third T-shaped connecting pipe 302 is connected to the cooling device, so that the steam produced by the triple-effect evaporation can be liquefied. Finally, the evaporated waste salt solution is discharged through the third water outlet pipe 303.
[0030] See also Figure 1-Figure 2 As shown, one end of the first ventilation pipe 4 is fixedly connected to the outside of the first T-shaped connecting pipe 102, the other end of the first ventilation pipe 4 is fixedly installed on the second air inlet pipe 207, one end of the second ventilation pipe 5 is fixedly connected to the outside of the second T-shaped connecting pipe 202, one end of the second T-shaped connecting pipe 202 is fixedly installed on the third air inlet pipe 305, one end of the first material delivery pipe 6 is fixedly installed on the first delivery pump 105, the other end of the first material delivery pipe 6 is fixedly installed on the second water inlet pipe 206, one end of the second material delivery pipe 7 is fixedly installed on the second delivery pump 205, and the other end of the second material delivery pipe 7 is fixedly connected to the third water inlet pipe 304.
[0031] In actual application, the first evaporator 1 , the second evaporator 2 and the third evaporator 3 are connected in series by providing the first ventilation pipe 4 , the second ventilation pipe 5 , the first material delivery pipe 6 and the second material delivery pipe 7 .
[0032] See also Figure 1-Figure 4As shown, each cleaning component 8 includes a driving motor 801, and multiple driving motors 801 are respectively fixedly installed on the top of the first T-shaped connecting tube 102, the second T-shaped connecting tube 202 and the third T-shaped connecting tube 302. The output shaft ends of the multiple driving motors 801 are fixedly connected to the rotating shaft 802, and the outer sides of the multiple rotating shafts 802 are fixedly connected to two connecting rods 803, and the two connecting rods 803 are symmetrically arranged. The other ends of the two connecting rods 803 are fixedly connected to the spiral scraper 804. The first evaporator 1, the second evaporator 202 and the third evaporator 302 are fixedly connected. Two connecting columns 805 are fixedly connected to the inner walls of the top sides of the second evaporator 2 and the third evaporator 3, and the two connecting columns 805 are symmetrically arranged. The bottom ends of the two connecting columns 805 are fixedly connected to an annular tube 806, and a plurality of high-pressure nozzles 807 are fixedly installed on the annular tube 806. The plurality of high-pressure nozzles 807 are inclined outward at 45 degrees. A water injection pipe 808 is fixedly connected to the annular tube 806, and the plurality of water injection pipes 808 pass through the inner walls of the top sides of the first evaporator 1, the second evaporator 2 and the third evaporator 3 and extend to the outside.
[0033] In actual application, through the cleaning components 8 arranged in the first evaporator 1, the second evaporator 2 and the third evaporator 3, multiple cleaning components 8 can clean the first evaporator 1, the second evaporator 2 and the third evaporator 3. Before cleaning, the multiple water injection pipes 808 are connected to a high-pressure water pump, and water is injected into the multiple water injection pipes 808 and the multiple annular tubes 806 through the multiple high-pressure water pumps. Then, the first evaporator 1, the second evaporator 2 and the third evaporator 3 are cleaned through the multiple high-pressure nozzles 807. At the same time, the multiple driving motors 801 drive the multiple rotating shafts 802 to rotate, and the rotating shafts 802 drive the two spiral scrapers 804 to rotate through the two connecting rods 803, so that the multiple spiral scrapers 804 can scrape off the stains remaining on the inner walls of the first evaporator 1, the second evaporator 2 and the third evaporator 3, thereby achieving the effect of cleaning the interior of the first evaporator 1, the second evaporator 2 and the third evaporator 3.
[0034] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.
Claims
1. A high-efficiency treatment device for chemical triple-effect evaporation waste salt, comprising a first evaporator (1), a second evaporator (2) and a third evaporator (3), characterized in that: The bottom sides of the first evaporator (1), the second evaporator (2) and the third evaporator (3) are all fixedly connected with a plurality of supporting legs. The first evaporator (1), the second evaporator (2) and the third evaporator (3) are provided with a first ventilation pipe (4), a second ventilation pipe (5), a first material delivery pipe (6) and a second material delivery pipe (7). The first ventilation pipe (4) and the first material delivery pipe (6) are used for connecting the first evaporator (1) and the second evaporator (2). The second ventilation pipe (5) and the second material delivery pipe (7) are used for connecting the second evaporator (2) and the third evaporator (3). Cleaning components (8) are all provided in the first evaporator (1), the second evaporator (2) and the third evaporator (3). The plurality of cleaning components (8) are used for cleaning the interior of the first evaporator (1), the second evaporator (2) and the third evaporator (3).
2. The high-efficiency treatment device for chemical triple-effect evaporation waste salt according to claim 1 is characterized in that: The first evaporator (1) comprises a first air outlet pipe (101), the first air outlet pipe (101) is fixedly connected to the center position of the top side of the first evaporator (1), a first T-shaped connecting pipe (102) is fixedly installed on the top of the first air outlet pipe (101), a first water outlet pipe (103) is fixedly connected to the center position of the bottom side of the first evaporator (1), a first T-shaped water outlet pipe (104) is fixedly installed at the bottom end of the first water outlet pipe (103), a first delivery pump (105) is fixedly installed at the water outlet end of the first T-shaped water outlet pipe (104), a first water inlet pipe (106) and a first air inlet pipe (107) are fixedly connected on the outside of the first evaporator (1), a first connecting water inlet pipe (108) is fixedly installed on one end of the first water inlet pipe (106), and a first connecting air inlet pipe (109) is fixedly installed on one end of the first air inlet pipe (107).
3. The high-efficiency treatment device for chemical triple-effect evaporation waste salt according to claim 2 is characterized in that: The second evaporator (2) comprises a second air outlet pipe (201), the second air outlet pipe (201) is fixedly connected to the center position of the top side of the second evaporator (2), a second T-shaped connecting pipe (202) is fixedly installed on the top side of the second air outlet pipe (201), a second water outlet pipe (203) is fixedly connected to the center position of the bottom side of the second evaporator (2), a second T-shaped water outlet pipe (204) is fixedly installed at the bottom end of the second water outlet pipe (203), a second delivery pump (205) is fixedly installed at the water outlet end of the second T-shaped water outlet pipe (204), and a second water inlet pipe (206) and a second air inlet pipe (207) are fixedly connected to the outside of the second evaporator (2).
4. The high-efficiency treatment device for chemical triple-effect evaporation waste salt according to claim 3 is characterized in that: The third evaporator (3) comprises a third air outlet pipe (301), the third air outlet pipe (301) being fixedly connected to the center position of the top side of the third evaporator (3), the top end of the third air outlet pipe (301) being fixedly connected to a third T-shaped connecting pipe (302), the center position of the bottom side of the third evaporator (3) being fixedly connected to a third water outlet pipe (303), and the outer side of the third evaporator (3) being fixedly connected to a third water inlet pipe (304) and a third air inlet pipe (305).
5. The high-efficiency treatment device for chemical triple-effect evaporation waste salt according to claim 4 is characterized in that: One end of the first ventilation pipe (4) is fixedly connected to the outside of the first T-shaped connecting pipe (102), the other end of the first ventilation pipe (4) is fixedly mounted on the second air inlet pipe (207), one end of the second ventilation pipe (5) is fixedly connected to the outside of the second T-shaped connecting pipe (202), one end of the second T-shaped connecting pipe (202) is fixedly mounted on the third air inlet pipe (305), one end of the first material delivery pipe (6) is fixedly mounted on the first delivery pump (105), the other end of the first material delivery pipe (6) is fixedly mounted on the second water inlet pipe (206), one end of the second material delivery pipe (7) is fixedly mounted on the second delivery pump (205), and the other end of the second material delivery pipe (7) is fixedly connected to the third water inlet pipe (304).
6. The high-efficiency treatment device for chemical triple-effect evaporation waste salt according to claim 1 is characterized in that: Each of the cleaning components (8) comprises a driving motor (801), and the plurality of driving motors (801) are fixedly mounted on the top ends of the first T-shaped connecting tube (102), the second T-shaped connecting tube (202), and the third T-shaped connecting tube (302), respectively; the output shaft ends of the plurality of driving motors (801) are fixedly connected to a rotating shaft (802), the outer sides of the plurality of rotating shafts (802) are fixedly connected to two connecting rods (803), and the two connecting rods (803) are symmetrically arranged; the other ends of the two connecting rods (803) are fixedly connected to a spiral scraper (804).
7. The high-efficiency treatment device for chemical triple-effect evaporation waste salt according to claim 1 is characterized in that: Two connecting columns (805) are fixedly connected to the top inner walls of the first evaporator (1), the second evaporator (2) and the third evaporator (3), and the two connecting columns (805) are symmetrically arranged. The bottom ends of the two connecting columns (805) are fixedly connected to an annular tube (806), and a plurality of high-pressure nozzles (807) are fixedly installed on the annular tube (806). The plurality of high-pressure nozzles (807) are arranged to be inclined outward at 45 degrees. A water injection pipe (808) is fixedly connected to the annular tube (806), and the plurality of water injection pipes (808) pass through the top inner walls of the first evaporator (1), the second evaporator (2) and the third evaporator (3) and extend to the outside.