Efficient turbulent flow magnesium oxide wet desulphurization ultra-low device

Abstract

The utility model relates to the technical field of magnesium oxide wet desulphurization, in particular to a high-efficiency turbulent flow magnesium oxide wet desulphurization ultralow device, which is convenient for mixing magnesium oxide and water to quickly react to form magnesium hydroxide, and is convenient for adjusting the amount of added water. Comprising a body mechanism; the feeding mechanism is installed on the main body mechanism, the stirring mechanism is installed in the feeding mechanism, the mixing mechanism is installed on the stirring mechanism, the water adding mechanism is installed on the feeding mechanism, and the water level monitoring mechanism is installed on the side wall of the feeding mechanism; dust removal, cooling and desulfurization are conveniently conducted on flue gas through the main body mechanism, magnesium hydroxide slurry is conveniently conveyed into the main body mechanism through the feeding mechanism, and magnesium oxide and water in the feeding mechanism are transversely stirred through the stirring mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field of magnesium oxide wet desulfurization, in particular to a high-efficiency turbulent magnesium oxide wet desulfurization ultra-low device. Background Art

[0002] In the production process of some industrial enterprises, boilers / or kilns are used. For boilers / or kilns, flue gas / or tail gas will inevitably be discharged. The flue gas / or tail gas discharged contains harmful substances such as "sulfur" and "nitrate" that pollute the environment. These substances are very harmful to human health. Therefore, the state has always strictly managed the discharge of harmful substances. Especially in recent years, the state has introduced stricter emission standards for flue gas / or tail gas containing harmful substances such as "sulfur" and "nitrate" - requiring both desulfurization and denitrification. At present, the main flue gas denitrification technologies are selective catalytic reduction (SCR), selective non-catalytic reduction (SNR), and denitrification. Reduction is abbreviated as SNCR). Both methods use reduction equipment; however, these process methods and the equipment used require relatively high temperatures, 300℃~400℃ for SCR method and 850℃~1000℃ for SNCR method; the flue gas temperature discharged from general small and medium-sized boilers is below 180℃, so SCR method and SNCR method are difficult to apply, and it is impossible to achieve the requirements of both desulfurization and denitrification at the same time, and the denitrification efficiency of SNCR method is relatively low.

[0003] In the existing desulfurization technology, for example, the existing technology with application number CN201410280411.0, it includes a sewage pipe, a desulfurizer inlet pipe, a water pipe, a main body, a flue gas inlet, a desulfurization A nozzle, a first-stage turbocharger turbulator, a desulfurization B nozzle, a lower receiving trough, a second-stage turbocharger turbulator, a denitrification C nozzle, an upper receiving trough, a denitrification D nozzle and a water nozzle, etc. By providing a desulfurizer inlet pipe, the desulfurizer can be replenished in time according to the specific situation. In this way, the desulfurizer inlet pipe, the desulfurizer outlet pipe, the desulfurizer solution pool outside the main body, the desulfurizer circulation pump, the desulfurization A pipe and the desulfurization A nozzle and the desulfurization B pipe and the desulfurization B nozzle together constitute a complete desulfurizer solution circulation.

[0004] However, the prior art is not convenient for mixing magnesium oxide with water to generate magnesium hydroxide slurry, and is not convenient for adjusting the amount of water added to the mixture, which reduces the practicality. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a high-efficiency turbulent magnesium oxide wet desulfurization ultra-low device which is convenient for mixing magnesium oxide and water to make them react quickly into magnesium hydroxide and convenient for adjusting the amount of added water.

[0006] The utility model discloses a high-efficiency turbulent magnesium oxide wet desulfurization ultra-low device, comprising a main body mechanism; further comprising a feeding mechanism, a stirring mechanism, a mixing mechanism, a water adding mechanism and a water level monitoring mechanism, wherein the feeding mechanism is mounted on the main body mechanism, the stirring mechanism is mounted in the feeding mechanism, the mixing mechanism is mounted on the stirring mechanism, the water adding mechanism is mounted on the feeding mechanism, and the water level monitoring mechanism is mounted on the side wall of the feeding mechanism, the main body mechanism is convenient for dust removal, cooling and desulfurization of flue gas, the feeding mechanism is convenient for transporting magnesium hydroxide slurry into the main body mechanism, and the stirring mechanism performs transverse stirring on magnesium oxide and water in the feeding mechanism, The mixing mechanism vertically mixes the magnesium oxide and water in the feeding mechanism, the water adding mechanism adds water into the feeding mechanism, and the water level monitoring mechanism is convenient for controlling the amount of water added into the main mechanism; the main mechanism is convenient for dust removal, cooling and desulfurization of flue gas, the feeding mechanism is convenient for transporting magnesium hydroxide slurry into the main mechanism, the stirring mechanism horizontally stirs the magnesium oxide and water in the feeding mechanism, the mixing mechanism vertically mixes the magnesium oxide and water in the feeding mechanism, the water adding mechanism adds water into the feeding mechanism, and the water level monitoring mechanism is convenient for controlling the amount of water added into the main mechanism, thereby improving practicality.

[0007] Preferably, the main structure includes a turbulent absorption tower, a flue gas pipe, a dust collector and a concentrating tower. The flue gas pipe is installed on the side wall of the turbulent absorption tower, and the dust collector and the concentrating tower are installed on the flue gas pipe. The flue gas enters the turbulent absorption tower for desulfurization after being filtered by the dust collector and cooled by the concentrating tower.

[0008] Preferably, the feeding mechanism includes a mixing barrel, a feeding hopper, a pump body and a delivery pipe, the mixing barrel is installed at the top of the turbulent absorption tower, the feeding hopper is installed on the side wall of the mixing barrel, the pump body is installed on the side wall of the mixing barrel, and the delivery pipe connects the pump body and the turbulent absorption tower; magnesium oxide is added to the mixing barrel through the feeding hopper, water is added to the mixing barrel through the water adding mechanism, the magnesium oxide and water are stirred by the stirring mechanism and the mixing mechanism to form a magnesium hydroxide slurry, and then the magnesium hydroxide slurry is added to the turbulent absorption tower through the delivery pipe by opening the pump body for desulfurization.

[0009] Preferably, the stirring mechanism includes a stirring shaft, stirring blades and a stirring motor. The stirring shaft is rotatably installed in the mixing barrel, the stirring blades are installed on the stirring shaft, the stirring motor is installed at the top of the mixing barrel, and the output end of the stirring motor is connected to the stirring shaft. By turning on the stirring motor to drive the stirring shaft to rotate, the stirring blades are then driven to rotate to horizontally stir the magnesium oxide and water in the mixing barrel.

[0010] Preferably, the mixing mechanism includes a fixed toothed disc, a rotating toothed disc, a gear, a rotating shaft and a mixing blade, the fixed toothed disc is mounted on the inner wall of the mixing barrel, the rotating toothed disc is mounted on the stirring shaft, the gear is connected to the fixed toothed disc and the rotating toothed disc core, the rotating shaft is mounted on the gear, and the mixing blade is mounted on the rotating shaft; when the stirring motor is turned on to drive the stirring shaft to rotate, the rotating toothed disc is driven to rotate, and then the gear is driven to rotate through the meshing relationship between the gear and the fixed toothed disc and the rotating toothed disc, thereby driving the rotating shaft and the mixing blade to rotate, and the magnesium oxide and water in the mixing barrel are longitudinally mixed through the rotation of the mixing blade.

[0011] Preferably, the water adding mechanism comprises a water pump and a water pipe, the water pump is mounted on the side wall of the mixing barrel, and the water pipe is mounted on the water pump; water is added into the mixing barrel through the water pipe by turning on the water pump.

[0012] Preferably, the water level monitoring mechanism includes a monitoring barrel, a sliding float, a sliding plate, a proximity switch and a threaded rod. The monitoring barrel is installed on the side wall of the mixing barrel, and the monitoring barrel is connected to the mixing barrel. The sliding float is slidably installed in the monitoring barrel by buoyancy, the sliding plate is slidably installed in the monitoring barrel, the proximity switch is installed at the bottom end of the sliding plate, and the threaded rod is rotatably installed on the top of the sliding plate, and the threaded rod is threadedly matched with the top surface of the monitoring barrel; when the water pump is turned on to add water to the mixing barrel through the water pipe, the buoyancy of the water drives the sliding float to slide in the monitoring barrel, and when the sliding float approaches the proximity switch, the water pump is controlled by the proximity switch to stop adding water. When the amount of water added needs to be adjusted, the threaded rod is rotated, and the sliding plate is driven to slide in the monitoring barrel due to the threaded relationship, and then the position of the proximity switch is adjusted, thereby controlling the amount of water added.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the main body mechanism facilitates dust removal, cooling and desulfurization of flue gas; the feeding mechanism facilitates the transportation of magnesium hydroxide slurry into the main body mechanism; the stirring mechanism stirs the magnesium oxide and water in the feeding mechanism horizontally; the mixing mechanism mixes the magnesium oxide and water in the feeding mechanism vertically; the water adding mechanism adds water into the feeding mechanism; the water level monitoring mechanism facilitates the control of the amount of water added into the main body mechanism, thereby improving practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a first axonometric structural schematic diagram of the utility model;

[0015] Figure 2 It is a second axonometric structural schematic diagram of the utility model;

[0016] Figure 3 It is a third axonometric structural schematic diagram of the utility model;

[0017] Figure 4 It is a fourth axonometric structural schematic diagram of the utility model;

[0018] Figure 5 It is a front-view cross-sectional axonometric structural schematic diagram of the utility model;

[0019] Figure 6 It is a front cross-sectional structural schematic diagram of the utility model;

[0020] Figure 7 It is a schematic diagram of the top-view cross-section axonometric structure of the utility model;

[0021] Figure 8 It is a side cross-sectional structural schematic diagram of the utility model;

[0022] Markings in the attached drawings: 01, main body; 11, turbulent absorption tower; 12, flue gas pipe; 13, dust collector; 14, concentration tower; 02, feeding mechanism; 21, mixing barrel; 22, feed hopper; 23, pump body; 24, feed pipe; 03, stirring mechanism; 31, stirring shaft; 32, stirring blades; 33, stirring motor; 04, mixing mechanism; 41, fixed gear disc; 42, rotating gear disc; 43, gear; 44, rotating shaft; 45, mixing blades; 05, water adding mechanism; 51, water pump; 52, water pipe; 06, water level monitoring mechanism; 61, monitoring barrel; 62, sliding float; 63, sliding plate; 64, proximity switch; 65, threaded rod. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0024] Example 1

[0025] like Figures 1 to 7 As shown, it includes a main body mechanism 01, a feeding mechanism 02, a stirring mechanism 03, a mixing mechanism 04, a water adding mechanism 05 and a water level monitoring mechanism 06. The feeding mechanism 02 is installed on the main body mechanism 01, the stirring mechanism 03 is installed in the feeding mechanism 02, the mixing mechanism 04 is installed on the stirring mechanism 03, the water adding mechanism 05 is installed on the feeding mechanism 02, and the water level monitoring mechanism 06 is installed on the side wall of the feeding mechanism 02;

[0026] The main body 01 facilitates dust removal, cooling and desulfurization of flue gas, the feeding mechanism 02 facilitates the transportation of magnesium hydroxide slurry into the main body 01, the stirring mechanism 03 horizontally stirs the magnesium oxide and water in the feeding mechanism 02, the mixing mechanism 04 vertically mixes the magnesium oxide and water in the feeding mechanism 02, the water adding mechanism 05 adds water into the feeding mechanism 02, and the water level monitoring mechanism 06 facilitates the control of the amount of water added into the main body 01;

[0027] The main structure 01 includes a turbulent absorption tower 11, a flue gas pipe 12, a dust collector 13 and a concentration tower 14. The flue gas pipe 12 is installed on the side wall of the turbulent absorption tower 11, and the dust collector 13 and the concentration tower 14 are installed on the flue gas pipe 12;

[0028] The feeding mechanism 02 includes a mixing barrel 21, a feed hopper 22, a pump body 23 and a delivery pipe 24. The mixing barrel 21 is installed at the top of the turbulent absorption tower 11, the feed hopper 22 is installed on the side wall of the mixing barrel 21, the pump body 23 is installed on the side wall of the mixing barrel 21, and the delivery pipe 24 connects the pump body 23 and the turbulent absorption tower 11;

[0029] The stirring mechanism 03 includes a stirring shaft 31, a stirring blade 32 and a stirring motor 33. The stirring shaft 31 is rotatably mounted in the mixing barrel 21, the stirring blade 32 is mounted on the stirring shaft 31, the stirring motor 33 is mounted on the top of the mixing barrel 21, and the output end of the stirring motor 33 is connected to the stirring shaft 31;

[0030] The mixing mechanism 04 includes a fixed toothed disc 41, a rotating toothed disc 42, a gear 43, a rotating shaft 44 and a mixing blade 45. The fixed toothed disc 41 is mounted on the inner wall of the mixing barrel 21, the rotating toothed disc 42 is mounted on the stirring shaft 31, the gear 43 is connected to the fixed toothed disc 41 and the rotating toothed disc 42, the rotating shaft 44 is mounted on the gear 43, and the mixing blade 45 is mounted on the rotating shaft 44;

[0031] The water adding mechanism 05 includes a water pump 51 and a water pipe 52. The water pump 51 is installed on the side wall of the mixing barrel 21, and the water pipe 52 is installed on the water pump 51.

[0032] The flue gas is filtered by the dust collector 13 and cooled by the concentration tower 14 before entering the turbulent absorption tower 11 for desulfurization. Magnesium oxide is added to the mixing barrel 21 through the feed hopper 22. Water is added to the mixing barrel 21 through the water pipe 52 by turning on the water pump 51. The stirring motor 33 is turned on to drive the stirring shaft 31 to rotate, thereby driving the stirring blade 32 to rotate and horizontally stirring the magnesium oxide and water in the mixing barrel 21. When the stirring motor 33 is turned on to drive the stirring shaft 31 to rotate, the rotating toothed disc 42 is driven to rotate, thereby driving the toothed disc 42 to rotate. The meshing relationship between the wheel 43 and the fixed gear plate 41 and the rotating gear plate 42 drives the gear 43 to rotate, thereby driving the rotating shaft 44 and the mixing blades 45 to rotate. The magnesium oxide and water in the mixing barrel 21 are longitudinally mixed through the rotation of the mixing blades 45 to form a magnesium hydroxide slurry. Thereafter, the magnesium hydroxide slurry is added to the turbulent absorption tower 11 through the feed pipe 24 for desulfurization by opening the pump body 23. The water level monitoring mechanism 06 facilitates the control of the amount of water added to the main mechanism 01, thereby improving practicality.

[0033] Example 2

[0034] like Figure 2 , Figure 3 , Figure 4 and Figure 8 As shown, it includes a main body mechanism 01, a feeding mechanism 02, a stirring mechanism 03, a mixing mechanism 04, a water adding mechanism 05 and a water level monitoring mechanism 06. The feeding mechanism 02 is installed on the main body mechanism 01, the stirring mechanism 03 is installed in the feeding mechanism 02, the mixing mechanism 04 is installed on the stirring mechanism 03, the water adding mechanism 05 is installed on the feeding mechanism 02, and the water level monitoring mechanism 06 is installed on the side wall of the feeding mechanism 02;

[0035] The main body 01 facilitates dust removal, cooling and desulfurization of flue gas, the feeding mechanism 02 facilitates the transportation of magnesium hydroxide slurry into the main body 01, the stirring mechanism 03 horizontally stirs the magnesium oxide and water in the feeding mechanism 02, the mixing mechanism 04 vertically mixes the magnesium oxide and water in the feeding mechanism 02, the water adding mechanism 05 adds water into the feeding mechanism 02, and the water level monitoring mechanism 06 facilitates the control of the amount of water added into the main body 01;

[0036] The main structure 01 includes a turbulent absorption tower 11, a flue gas pipe 12, a dust collector 13 and a concentration tower 14. The flue gas pipe 12 is installed on the side wall of the turbulent absorption tower 11, and the dust collector 13 and the concentration tower 14 are installed on the flue gas pipe 12;

[0037] The feeding mechanism 02 includes a mixing barrel 21, a feed hopper 22, a pump body 23 and a delivery pipe 24. The mixing barrel 21 is installed at the top of the turbulent absorption tower 11, the feed hopper 22 is installed on the side wall of the mixing barrel 21, the pump body 23 is installed on the side wall of the mixing barrel 21, and the delivery pipe 24 connects the pump body 23 and the turbulent absorption tower 11;

[0038] The water level monitoring mechanism 06 includes a monitoring barrel 61, a sliding floating plate 62, a sliding plate 63, a proximity switch 64 and a threaded rod 65. The monitoring barrel 61 is installed on the side wall of the mixing barrel 21, the monitoring barrel 61 is connected to the mixing barrel 21, the sliding floating plate 62 is slidably installed in the monitoring barrel 61 by buoyancy, the sliding plate 63 is slidably installed in the monitoring barrel 61, the proximity switch 64 is installed at the bottom end of the sliding plate 63, the threaded rod 65 is rotatably installed at the top end of the sliding plate 63, and the threaded rod 65 is threadedly matched with the top surface of the monitoring barrel 61;

[0039] The main body mechanism 01 facilitates dust removal, cooling and desulfurization of flue gas, the feeding mechanism 02 facilitates the transportation of magnesium hydroxide slurry into the main body mechanism 01, the stirring mechanism 03 stirs the magnesium oxide and water in the feeding mechanism 02 horizontally, the mixing mechanism 04 mixes the magnesium oxide and water in the feeding mechanism 02 vertically, and the water adding mechanism 05 adds water into the feeding mechanism 02. When the water pump 51 is turned on to add water into the mixing barrel 21 through the water pipe 52, the sliding float 62 is driven by the buoyancy of the water to slide in the monitoring barrel 61. When the sliding float 62 is close to the proximity switch 64, the water pump 51 is controlled by the proximity switch 64 to stop adding water. When the amount of water added needs to be adjusted, the threaded rod 65 is rotated, and the sliding plate 63 is driven to slide in the monitoring barrel 61 due to the threaded relationship, and then the position of the proximity switch 64 is adjusted, thereby controlling the amount of water added.

[0040] like Figures 1 to 8 As shown, the utility model is a high-efficiency turbulent magnesium oxide wet desulfurization ultra-low device. When it is working, the flue gas passes through the filtration of the dust collector 13 and the cooling of the concentration tower 14 to enter the turbulent absorption tower 11 for desulfurization, and the magnesium oxide is added to the mixing barrel 21 through the feed hopper 22. By turning on the water pump 51, water is added to the mixing barrel 21 through the water pipe 52. By turning on the stirring motor 33, the stirring shaft 31 is driven to rotate, and then the stirring blades 32 are driven to rotate to horizontally stir the magnesium oxide and water in the mixing barrel 21. When the stirring motor 33 is turned on to drive the stirring shaft 31 to rotate, the rotating toothed disc 42 is driven to rotate, and then the gear 43 is driven to rotate through the meshing relationship between the gear 43 and the fixed toothed disc 41 and the rotating toothed disc 42, thereby driving the rotating shaft 44 and the mixing blades 45. Rotate, through the rotation of the mixing blade 45, the magnesium oxide and water in the mixing barrel 21 are longitudinally mixed to form a magnesium hydroxide slurry, and then the magnesium hydroxide slurry is added to the turbulent absorption tower 11 through the feed pipe 24 by opening the pump body 23 for desulfurization. When the water pump 51 is turned on to add water to the mixing barrel 21 through the water pipe 52, the buoyancy of the water drives the sliding float 62 to slide in the monitoring barrel 61. When the sliding float 62 is close to the proximity switch 64, the water pump 51 is controlled by the proximity switch 64 to stop adding water. When the amount of water added is to be adjusted, the threaded rod 65 is rotated, and the sliding plate 63 is driven to slide in the monitoring barrel 61 due to the threaded relationship, and then the position of the proximity switch 64 is adjusted, thereby controlling the amount of water added.

[0041] The turbulent absorption tower 11, dust collector 13, concentration tower 14, pump body 23, stirring motor 33, water pump 51 and proximity switch 64 of the utility model are purchased on the market. The technicians in this industry only need to install and operate them according to the accompanying instruction manuals, without the need for the technicians in this field to make creative efforts.

[0042] The main functions achieved by the utility model are: in the process of wet desulfurization of magnesium oxide, it is convenient to mix magnesium oxide and water so that they react quickly to form magnesium hydroxide, and it is convenient to adjust the amount of added water.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A highly efficient turbulent magnesium oxide wet desulfurization ultra-low device, comprising a main body mechanism (01); characterized in that: It also includes a feeding mechanism (02), a stirring mechanism (03), a mixing mechanism (04), a water adding mechanism (05) and a water level monitoring mechanism (06), wherein the feeding mechanism (02) is mounted on the main body mechanism (01), the stirring mechanism (03) is mounted in the feeding mechanism (02), the mixing mechanism (04) is mounted on the stirring mechanism (03), the water adding mechanism (05) is mounted on the feeding mechanism (02), and the water level monitoring mechanism (06) is mounted on the side wall of the feeding mechanism (02); The main body mechanism (01) is convenient for dust removal, cooling and desulfurization of flue gas, the feeding mechanism (02) is convenient for transporting magnesium hydroxide slurry into the main body mechanism (01), the stirring mechanism (03) stirs the magnesium oxide and water in the feeding mechanism (02) horizontally, the mixing mechanism (04) mixes the magnesium oxide and water in the feeding mechanism (02) vertically, the water adding mechanism (05) adds water into the feeding mechanism (02), and the water level monitoring mechanism (06) is convenient for controlling the amount of water added into the main body mechanism (01).

2. A high-efficiency turbulent magnesium oxide wet desulfurization ultra-low device as claimed in claim 1, characterized in that: The main structure (01) comprises a turbulent absorption tower (11), a flue gas pipe (12), a dust collector (13) and a concentration tower (14); the flue gas pipe (12) is installed on the side wall of the turbulent absorption tower (11), and the dust collector (13) and the concentration tower (14) are installed on the flue gas pipe (12).

3. A high-efficiency turbulent magnesium oxide wet desulfurization ultra-low device as claimed in claim 2, characterized in that: The feeding mechanism (02) comprises a mixing barrel (21), a feeding hopper (22), a pump body (23) and a feeding pipe (24); the mixing barrel (21) is installed at the top of the turbulent absorption tower (11); the feeding hopper (22) is installed on the side wall of the mixing barrel (21); the pump body (23) is installed on the side wall of the mixing barrel (21); and the feeding pipe (24) connects the pump body (23) and the turbulent absorption tower (11).

4. A high-efficiency turbulent magnesium oxide wet desulfurization ultra-low device as claimed in claim 3, characterized in that: The stirring mechanism (03) comprises a stirring shaft (31), a stirring blade (32) and a stirring motor (33); the stirring shaft (31) is rotatably mounted in the mixing barrel (21); the stirring blade (32) is mounted on the stirring shaft (31); the stirring motor (33) is mounted on the top of the mixing barrel (21); and the output end of the stirring motor (33) is connected to the stirring shaft (31).

5. A high-efficiency turbulent magnesium oxide wet desulfurization ultra-low device as claimed in claim 3, characterized in that: The mixing mechanism (04) comprises a fixed toothed disc (41), a rotating toothed disc (42), a gear (43), a rotating shaft (44) and a mixing blade (45), wherein the fixed toothed disc (41) is mounted on the inner wall of the mixing barrel (21), the rotating toothed disc (42) is mounted on the stirring shaft (31), the gear (43) is connected to the inner core of the fixed toothed disc (41) and the rotating toothed disc (42), the rotating shaft (44) is mounted on the gear (43), and the mixing blade (45) is mounted on the rotating shaft (44).

6. A high-efficiency turbulent magnesium oxide wet desulfurization ultra-low device as claimed in claim 3, characterized in that: The water adding mechanism (05) comprises a water pump (51) and a water pipe (52). The water pump (51) is installed on the side wall of the mixing barrel (21), and the water pipe (52) is installed on the water pump (51).

7. A high-efficiency turbulent magnesium oxide wet desulfurization ultra-low device as claimed in claim 3, characterized in that: The water level monitoring mechanism (06) comprises a monitoring barrel (61), a sliding float (62), a sliding plate (63), a proximity switch (64) and a threaded rod (65). The monitoring barrel (61) is mounted on the side wall of the mixing barrel (21). The monitoring barrel (61) is connected to the mixing barrel (21). The sliding float (62) is slidably mounted in the monitoring barrel (61) by buoyancy. The sliding plate (63) is slidably mounted in the monitoring barrel (61). The proximity switch (64) is mounted on the bottom end of the sliding plate (63). The threaded rod (65) is rotatably mounted on the top end of the sliding plate (63). The threaded rod (65) is threadedly matched with the top surface of the monitoring barrel (61).

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