Cooling crystallizer for recycling desulfurization wastewater

Abstract

The utility model belongs to the field of crystallizers, and particularly relates to a cooling crystallizer for recycling desulfurization wastewater, which comprises a crystallizing tank, a tank cover is mounted at the top of the crystallizing tank through bolts, a motor is fixedly mounted at the top of the tank cover, and an output shaft of the motor penetrates through the tank cover and is connected with the tank cover through a bearing. The tail end of the output shaft is fixedly connected with a hollow pipe, the lower section of a pipe body of the hollow pipe is provided with a one-way valve nozzle, the bottom of the hollow pipe is fixedly connected with a square block, and the bottom of the inner side of the crystallizing tank is fixedly connected with a fixed seat. According to the utility model, the hollow pipe driven by the motor is arranged in the crystallizing tank, the one-way valve nozzle is arranged on the hollow pipe, the sealing sleeve, the refrigerant inlet, the through hole and other parts are arranged on the hollow pipe, and after the refrigerant inlet is connected with the refrigerant source, a refrigerant for crystallization can be conveyed to the rotating hollow pipe; furthermore, the mixing of the refrigerant and the evaporated and concentrated material liquid is accelerated, and the crystallization efficiency is accelerated.

Description

Technical Field

[0001] This utility model relates to the field of crystallizers, specifically a cooling crystallizer for desulfurization wastewater recovery. Background Technology

[0002] Coal-fired power plants generate a large amount of flue gas containing SO2 due to coal combustion. The commonly used treatment method is limestone-gypsum wet desulfurization, and the desulfurization wastewater generated in this process comes from the effluent from the absorption tower.

[0003] A search revealed a utility model patent with authorization announcement number CN208071516U, which discloses a desulfurization wastewater treatment device, including a pre-processor, a preheater, an MVR multi-effect evaporator, a cooling crystallizer, a centrifugal dehydrator, and a dryer. The MVR multi-effect evaporator includes a multi-effect falling film evaporator, a forced circulation evaporator, and a compressor. Starting from the first-effect falling film evaporator, the steam outlet of the previous-effect falling film evaporator is connected to the steam inlet of the next-effect falling film evaporator via a pipe. The steam outlet of the last-effect falling film evaporator is connected to the compressor. The liquid outlets of the multi-effect falling film evaporators are connected sequentially via pipes. The liquid outlet of the last-effect falling film evaporator is connected to the forced circulation evaporator. The steam outlet of the forced circulation evaporator is connected to the compressor. The steam outlet of the compressor is connected to the first-effect falling film evaporator and the forced circulation evaporator.

[0004] In existing technologies, the function of a cooling crystallizer is to utilize the difference in solubility of sodium chloride and magnesium sulfate with temperature to control the cooling temperature below 20℃ and the crystallization residence time to 0.25-1 hour, precipitating MgSO4•7H2O crystals. This achieves the effective utilization of sulfur-containing components in wastewater. However, in the operation of existing cooling crystallizers, the concentrated evaporation solution needs to contact the refrigerant after entering the crystallization tank. However, some of the solution does not make sufficient contact with the refrigerant, affecting efficiency. Moreover, the precipitated crystals tend to accumulate at the bottom of the tank, causing blockages during discharge. Therefore, improvements are needed. Utility Model Content

[0005] The purpose of this utility model is to provide a cooling crystallizer for desulfurization wastewater recovery, which solves the problem that in the existing cooling crystallizer, after the concentrated evaporation liquid enters the crystallization tank, it needs to come into contact with the refrigerant, but some of the liquid does not come into sufficient contact with the refrigerant, thus affecting efficiency. At the same time, it also solves the problem that the precipitated crystals tend to accumulate at the bottom of the tank, causing blockage during discharge.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a cooling crystallizer for desulfurization wastewater recovery, comprising a crystallization tank, a tank cover bolted to the top of the crystallization tank, a motor fixedly mounted on the top of the tank cover, an output shaft of the motor penetrating the tank cover and connected to the tank cover via a bearing, a hollow tube fixedly connected to the end of the output shaft, a one-way valve nozzle provided in the lower section of the hollow tube, a block fixedly connected to the bottom of the hollow tube, a fixed base fixedly connected to the bottom inner side of the crystallization tank, a rotating shaft mounted on the fixed base via a bearing, the top of the rotating shaft engaging with the block, a connecting arm fixedly connected to the rotating shaft, and a stirring mechanism provided on the connecting arm.

[0007] Preferably, a scraper is fixedly connected to the end of the connecting arm, and the scraper contacts the inner wall of the crystallization tank. The scraper facilitates cleaning of the bottom of the crystallization tank.

[0008] Preferably, the stirring mechanism includes a hollow sleeve fixedly connected to the connecting arm, a sliding pin slidably connected to the inner side of the hollow sleeve, a stirring rod fixedly connected to the upper section of the sliding pin, a spring provided inside the hollow sleeve, a guide block fixedly connected to the lower section of the sliding pin, the guide block slidably connected to the hollow sleeve, a flow guide shroud fixedly connected to the inner wall of the crystallization tank, and a beveled ring fixedly connected to the bottom of the flow guide shroud, the beveled ring abutting against the sliding pin. By setting up the stirring mechanism, the cleaned adhesive can be stirred, preventing solidification and blockage during discharge.

[0009] Preferably, one end of the spring is fixedly connected to the sliding pin, and the other end of the spring is fixedly connected to the inner surface of the hollow sleeve. By using the spring, the elastic force can be applied to the sliding pin.

[0010] Preferably, a first fixing ring is fixedly connected to the outer side of the hollow sleeve, and a second fixing ring is fixedly connected to the middle section of the sliding pin. A rubber sleeve is fixedly connected between the second fixing ring and the first fixing ring. The rubber sleeve provides protection for the spring.

[0011] Preferably, a slurry outlet pipe is fixedly connected to the bottom of the crystallization tank, and a feed pipe is fixedly connected to the tank cover. The slurry outlet pipe and the feed pipe facilitate the entry and exit of materials in the crystallization tank.

[0012] Preferably, the upper section of the hollow tube is fitted with a sealing sleeve via a sealed bearing. A refrigerant inlet is fixedly connected inside the sealing sleeve. The refrigerant inlet penetrates the tank lid and extends to the outside of the lid. A through hole is formed on the hollow tube, and the through hole corresponds to the position of the sealing sleeve. A refrigerant outlet is fixedly connected to the side wall of the crystallizing tank. The sealing sleeve, refrigerant inlet, and through hole facilitate the supply of refrigerant for crystallization to the rotating hollow tube.

[0013] Compared with the prior art, the utility model has the advantages that:

[0014] 1、 the utility model discloses a hollow tube driven by the motor is arranged in the crystallization tank, the hollow tube has the one -way valve nozzle, in addition, the sealing sleeve, the refrigerant inlet and the through -hole etc.

[0015] 2、 the utility model discloses a rotatable shaft is arranged in the bottom of the crystallization tank, and the shaft can be driven by the hollow tube through the block, in addition, the connecting arm with the scraping strip is arranged on the shaft, and the stirring mechanism is arranged in the middle section of the connecting arm, in addition, the flow guide cover with the inclined ring is arranged in the crystallization tank, and the inclined ring is contacted with the slide pin in the stirring mechanism, so that the slide pin is contacted with the inclined ring in the process of rotating, and the slide pin can periodically rise and fall, and the crystallization slurry is stirred, and the blockage when discharging is prevented. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the overall structure perspective drawing of the utility model;

[0017] Figure 2 It is the partial structure schematic view of the utility model Figure 1 ;

[0018] Figure 3 It is the front view sectional view of the utility model Figure 1 ;

[0019] Figure 4 It is the A department structure enlarged view of the utility model Figure 3 ;

[0020] Figure 5 It is the stirring mechanism structure enlarged view of the utility model Figure 3 ;

[0021] In the drawing: 1, crystallization tank;2, tank cover;3, motor;4, hollow tube;41, block;5, one -way valve nozzle;6, connecting arm;7, scraping strip;8, stirring mechanism;9, flow guide cover;10, inclined ring;11, refrigerant outlet;12, feed pipe;13, slurry outlet pipe;14, fixed seat;15, shaft;16, sealing sleeve;17, refrigerant inlet;18, through -hole;81, hollow sleeve;82, slide pin;83, stirring rod;84, guide block;85, spring;86, fixed ring one;87, fixed ring two;88, rubber sleeve. DETAILED DESCRIPTION

[0022] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0023] Please refer to Figures 1-3 The utility model provides a cooling crystallizer for desulfurization wastewater recovery, including crystallization tank 1, the top of crystallization tank 1 is installed with tank cover 2 through bolt, the top of tank cover 2 is fixedly installed with motor 3, the output shaft of motor 3 penetrates tank cover 2 and is connected with tank cover 2 through bearing, the end of output shaft is fixedly connected with hollow tube 4, the pipe body lower section of hollow tube 4 is provided with one way valve nozzle 5, the bottom of hollow tube 4 is fixedly connected with square block 41, the inner side bottom of crystallization tank 1 is fixedly connected with fixed seat 14, fixed seat 14 is installed with pivot 15 through bearing, the top of pivot 15 is clamped with square block 41, pivot 15 is fixedly connected with connecting arm 6, the end of connecting arm 6 is fixedly connected with scraping strip 7, and scraping strip 7 is in contact with the inner wall of crystallization tank 1. Through the setting of scraping strip 7, it is convenient to clean the bottom of crystallization tank 1.

[0024] Please refer to Figure 3 、 Figure 5 The utility model provides a cooling crystallizer for desulfurization wastewater recovery, including crystallization tank 1, the top of crystallization tank 1 is installed with tank cover 2 through bolt, the top of tank cover 2 is fixedly installed with motor 3, the output shaft of motor 3 penetrates tank cover 2 and is connected with tank cover 2 through bearing, the end of output shaft is fixedly connected with hollow tube 4, the pipe body lower section of hollow tube 4 is provided with one way valve nozzle 5, the bottom of hollow tube 4 is fixedly connected with square block 41, the inner side bottom of crystallization tank 1 is fixedly connected with fixed seat 14, fixed seat 14 is installed with pivot 15 through bearing, the top of pivot 15 is clamped with square block 41, pivot 15 is fixedly connected with connecting arm 6, the end of connecting arm 6 is fixedly connected with scraping strip 7, and scraping strip 7 is in contact with the inner wall of crystallization tank 1. Through the setting of scraping strip 7, it is convenient to clean the bottom of crystallization tank 1.

[0025] Please refer to Figures 1-4The bottom of the crystallization tank 1 is fixedly connected with a slurry outlet pipe 13, and the tank cover 2 is fixedly connected with a feeding pipe 12. Through the arrangement of the slurry outlet pipe 13 and the feeding pipe 12, the material can be conveniently fed into and out of the crystallization tank 1. The upper segment of the pipe body of the hollow pipe 4 is provided with a sealing sleeve 16 through a sealing bearing, the inside of the sealing sleeve 16 is fixedly connected with a refrigerant inlet 17, the refrigerant inlet 17 penetrates through the tank cover 2 and extends to the outside of the tank cover 2, a through hole 18 is formed in the hollow pipe 4 and corresponds to the position of the sealing sleeve 16, and the side wall of the crystallization tank 1 is fixedly connected with a refrigerant outlet 11. Through the arrangement of the sealing sleeve 16, the refrigerant inlet 17 and the through hole 18, the refrigerant for crystallization can be conveniently delivered to the rotating hollow pipe 4.

[0026] The specific implementation process of the utility model is as follows: in use, the material liquid concentrated by evaporation is added into the crystallization tank 1 through the feeding pipe 12, then the motor 3 is started, the motor 3 drives the hollow pipe 4 to rotate, and the refrigerant inlet 17 is connected with the refrigerant source through a pipeline, so that the refrigerant for crystallization can be delivered to the rotating hollow pipe 4, the mixing of the refrigerant and the material liquid concentrated by evaporation is accelerated, the efficiency of crystallization is accelerated, the hollow pipe 4 drives the rotating shaft 15 to rotate through the square block 41, the rotating shaft 15 drives the stirring mechanism 8 to rotate, the slurry for crystallization is stirred, and the sliding pin 82 in the stirring mechanism 8 is matched with the inclined surface ring 10 in the rotating process, which can also be periodically lifted up and down, thereby increasing the stirring of the crystallization slurry and preventing the blockage during discharge caused by solidification.

[0027] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A cooling crystallizer for recovering desulfurization wastewater, comprising a crystallization tank (1), characterized in that: The top of the crystallization tank (1) is provided with a tank cover (2) through bolt mounting, the top of the tank cover (2) is fixedly provided with a motor (3), the output shaft of the motor (3) penetrates the tank cover (2) and is connected with the tank cover (2) through a bearing, the end of the output shaft is fixedly connected with a hollow tube (4), the lower segment of the tube body of the hollow tube (4) is provided with a one-way valve nozzle (5), the bottom of the hollow tube (4) is fixedly connected with a square block (41), the inner bottom of the crystallization tank (1) is fixedly connected with a fixed seat (14), the fixed seat (14) is provided with a rotating shaft (15) through bearing mounting, the top of the rotating shaft (15) is clamped with the square block (41), the rotating shaft (15) is fixedly connected with a connecting arm (6), and the connecting arm (6) is provided with a stirring mechanism (8).

2. The cooling crystallizer for recovering desulfurization wastewater according to claim 1, characterized in that: The end of the connecting arm (6) is fixedly connected with a scraping strip (7), and the scraping strip (7) is in contact with the inner wall of the crystallization tank (1).

3. The cooling crystallizer for recovering desulfurization wastewater according to claim 1, characterized in that: The stirring mechanism (8) comprises a hollow sleeve (81) fixedly connected to the connecting arm (6), a sliding pin (82) slidably connected to the inner side of the hollow sleeve (81), a stirring rod (83) fixedly connected to the upper segment of the pin body of the sliding pin (82), a spring (85) arranged on the inner side of the hollow sleeve (81), a guide block (84) fixedly connected to the lower segment of the pin body of the sliding pin (82), and the guide block (84) is slidably connected with the hollow sleeve (81), the inner wall of the crystallization tank (1) is fixedly connected with a flow guide cover (9), the bottom of the flow guide cover (9) is fixedly connected with an inclined surface ring (10), and the inclined surface ring (10) is in contact with the sliding pin (82).

4. The cooling crystallizer for recovering desulfurization wastewater according to claim 3, characterized in that: One end of the spring (85) is fixedly connected with the sliding pin (82), and the other end of the spring (85) is fixedly connected to the inner surface of the hollow sleeve (81).

5. The cooling crystallizer for recovering desulfurization wastewater according to claim 3, characterized in that: The outer side of the hollow sleeve (81) is fixedly connected with a fixed ring one (86), the middle segment of the pin body of the sliding pin (82) is fixedly connected with a fixed ring two (87), and the fixed ring two (87) and the fixed ring one (86) are jointly fixedly connected with a rubber sleeve (88).

6. The cooling crystallizer for recovering desulfurization wastewater according to claim 1, characterized in that: The bottom of the crystallization tank (1) is fixedly connected with a slurry outlet pipe (13), and the tank cover (2) is fixedly connected with a feeding pipe (12).

7. The cooling crystallizer for recovering desulfurization wastewater according to claim 1, characterized in that: The upper segment of the tube body of the hollow tube (4) is provided with a sealing sleeve (16) through sealing bearing mounting, the inside of the sealing sleeve (16) is fixedly connected with a refrigerant inlet (17), the refrigerant inlet (17) penetrates the tank cover (2) and extends to the outside of the tank cover (2), a through hole (18) is formed in the hollow tube (4), and the through hole (18) corresponds in position to the sealing sleeve (16), and the side wall of the crystallization tank (1) is fixedly connected with a refrigerant outlet (11).

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