Integrated evaporation crystallization device and method for sodium chloride and sodium sulfate production

Abstract

The application discloses a kind of integrated evaporation crystallization device and method for sodium chloride, sodium sulfate production, and the device includes preheating component, condensing component connected with preheating component and evaporation crystallization component respectively connected with preheating component and condensing component;Preheating component includes preheating tank and heating member arranged in preheating tank;Condensing component includes condensing box and condensing plate arranged in condensing box, and condensing box is connected with preheating tank;Evaporation crystallization component includes evaporation tank, crystallization seat arranged in evaporation tank and heating disc arranged in evaporation tank and located at the lower end of crystallization seat;Evaporation tank is connected with preheating tank and condensing box respectively;The side wall of evaporation tank is provided with sealing door;The device structure of the application is reasonable in design, and sodium chloride, sodium sulfate production efficiency is high, and it is suitable for promotion and use.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of wastewater treatment, in particular to an integrated evaporation crystallization device and method for sodium chloride and sodium sulfate production. BACKGROUND

[0002] High-salinity wastewater is different from other types of wastewater, and the difference in composition is not too large, and the salt substances contained mainly include CI - , SO4 2- , Na + , Ca 2+ and other salt substances. During wastewater discharge, the salt substances in the high-salinity wastewater can be extracted by salt separation.

[0003] In the current high-salinity organic wastewater treatment process, the treatment methods include incineration, electrochemistry, membrane separation, evaporation crystallization and ion exchange. The most effective way for high-salinity organic wastewater treatment is to realize efficient resource utilization on the basis of zero discharge. To realize the final zero discharge of wastewater, the evaporation crystallization method is irreplaceable, which can realize the resource recovery of salts. The evaporation crystallization method for treating high-salinity organic wastewater can break through the previous wastewater treatment technology, and the recovered substances have higher utilization value, realizing wastewater resource utilization and zero discharge. The evaporation crystallizer uses evaporation of part of the solvent to reach the supersaturation state of the solution. The existing evaporation crystallizer is usually divided into two parts. One part is an evaporator, which needs to continuously heat the wastewater. After the wastewater is boiled, steam is generated and condensed into condensed water by a condensing end to discharge the evaporator. The other part is a crystallizer. The concentrated wastewater in the evaporator is injected into the crystallizer for continuous heating. When the solution is supersaturated, crystals are precipitated to achieve the crystallization effect.

[0004] However, in the use process of the existing evaporation crystallizer, the wastewater in the evaporator is long-term at the bottom of the equipment, and the contact area with the chamber is small during heating, so the steam generation speed is too low, which affects the wastewater concentration efficiency, and thus the yield of the equipment is low. At the same time, the salt precipitated by crystallization is easy to form a block at the bottom of the crystallizer, which affects the operation safety of the equipment. SUMMARY

[0005] In view of the above technical problems, the application provides an integrated evaporation crystallization device and method for sodium chloride and sodium sulfate production.

[0006] The technical scheme of the present application is: an integrated evaporation crystallization device for sodium chloride and sodium sulfate production, comprising a preheating assembly, a condensing assembly connected with the preheating assembly, and an evaporation crystallization assembly connected with the preheating assembly and the condensing assembly respectively; the preheating assembly comprises a preheating tank and a heating member arranged inside the preheating tank; a feed pipe is arranged at the top end of the preheating tank, and a circulating pipe connected with the feed pipe is arranged at the lower end of the side wall of the preheating tank; a circulating pump is arranged at the connection between the circulating pipe and the preheating tank;

[0007] The condensing assembly comprises a condensing box and a plurality of condensing plates arranged in parallel inside the condensing box; a first steam pipe is arranged at the bottom end of one side of the condensing box and connected with the upper position of the side wall of the preheating tank; each condensing plate is arranged obliquely inside the condensing box; a water collecting tank is arranged inside the condensing box and corresponds to the lower side position of each condensing plate; a drain pipe is arranged on the outer wall of the condensing box and corresponds to the position of each water collecting tank;

[0008] The evaporation crystallization assembly comprises an evaporation tank, a crystallization seat arranged inside the evaporation tank, and a heating disc arranged inside the evaporation tank and located at the lower end of the crystallization seat; the upper end of the side wall of the evaporation tank is connected with the circulating pipe through a transfer pipe, and a control valve is arranged at the connection; a first evaporation chamber and a second evaporation chamber are arranged in the evaporation tank from top to bottom; a second steam pipe is arranged on the side wall of the evaporation tank and communicates with the first evaporation chamber and the second evaporation chamber respectively, and the second steam pipe is connected with the bottom end of the other side of the condensing box; the crystallization seat and the heating disc are both provided with two, and the two crystallization seats and heating discs are arranged one by one in the first evaporation chamber and the second evaporation chamber respectively; a sealing door is movably arranged on the side wall of the evaporation tank and corresponds to the position of the first evaporation chamber and the second evaporation chamber.

[0009] Further, the heating member comprises a plurality of heating water jackets arranged one after another and an electric heating coil pipe arranged at the bottom inside the preheating tank; a water flow channel is arranged between adjacent two heating water jackets, and an inclined baffle is arranged inside the water flow channel; a flow dividing plate is arranged at the top inside the preheating tank, and a plurality of flow dividing holes are equidistantly distributed on the flow dividing plate; a water supply pipe connected with each heating water jacket is arranged on the outer wall of the preheating tank;

[0010] Explanation: when the wastewater passes through the water flow channel between adjacent two heating water jackets, the wastewater is heated for the first time, and the hot steam in the wastewater is discharged through the first steam pipe; when the wastewater falls into the bottom of the preheating tank, the wastewater is heated for the second time by the electric heating coil pipe, thereby improving the preheating efficiency and uniformity of the wastewater.

[0011] Further, a slot is arranged on each condensing plate, and the slots on the upper and lower adjacent two condensing plates are staggered with each other; a water guide tooth plate is arranged on the lower bottom surface of each condensing plate;

[0012] : By setting the grooves staggered on the condensing plate, the rising path of the hot steam is changed, thereby improving the cooling efficiency of the hot steam; the water droplets condensed on the condensing plate are quickly and timely introduced into the water collecting tank by the water guide toothed plate, thereby improving the effect of the condensing plate.

[0013] Further, each condensing plate is rotationally connected with the inner wall of the condensing box, and a reset torsional spring is arranged at the connection between each condensing plate and the condensing box; a rotating shaft is arranged through the side wall of the condensing box and located below each condensing plate, one end of each rotating shaft is provided with a cam corresponding to the lower bottom surface of each condensing plate, and the other end of each rotating shaft is provided with a connecting pulley, and the connecting pulleys are driven by a belt;

[0014] : In use, one of the connecting pulleys is rotated by the rotating motor, so that the rotating shafts rotate at the same time, and the cams on the rotating shafts continuously hit the condensing plates, so that the water droplets gathered on the lower bottom surface of the condensing plates can quickly drop.

[0015] Further, a stirring motor is arranged at the top end of the evaporation tank, a stirring shaft is arranged through the first evaporation chamber and the second evaporation chamber on the output shaft of the stirring motor, and stirring discs are arranged on the stirring shaft and located above the two crystallization seats;

[0016] : By arranging the stirring motor and the stirring discs, the precipitation efficiency of sodium chloride and sodium sulfate crystals can be improved, and the sodium chloride and sodium sulfate crystals can be prevented from caking when precipitating, thereby improving the production efficiency and quality of sodium chloride and sodium sulfate.

[0017] Further, a discharge hole is arranged on each of the crystallization seat and the heating disc in the first evaporation chamber; an opening disc is arranged at the top of the second evaporation chamber, a sealing column is arranged on the opening disc and movably inserted into the discharge hole, a lead screw is rotationally connected to the inner wall of the second evaporation chamber, and a first bevel gear is arranged at the bottom end of the lead screw; the opening disc is threadedly connected to the lead screw through a connecting arm; an auxiliary motor is arranged on the outer wall of the evaporation tank, the output shaft of the auxiliary motor penetrates the evaporation tank, and a second bevel gear is arranged on the output shaft and engaged with the first bevel gear;

[0018] : In use, the second bevel gear is rotated by the auxiliary motor, the lead screw is rotated by the meshing action of the second bevel gear and the first bevel gear, and the opening disc moves downward under the action of the lead screw, so that the sealing column is separated from the discharge hole, thereby enabling the concentrated liquid in the first evaporation chamber to quickly flow into the second evaporation chamber, reducing the heat loss during the transfer of the concentrated liquid, and reducing the energy consumption of the device.

[0019] Further, the two sealing doors are movably connected to the evaporation tank through the arc-shaped sliding frames, and gear grooves are arranged on the sides of the two sealing doors close to each other; a discharging motor is arranged on the outer wall of the evaporation tank and between the two sealing doors, motor shafts penetrating through the arc-shaped sliding frames are arranged at the two ends of the discharging motor, and pinions are arranged on the two motor shafts and meshed with the two gear grooves one by one.

[0020] Description: When in use, the discharging motor drives the two pinions to rotate, so that the two sealing doors move on the corresponding arc-shaped sliding frames, facilitating the transfer of the materials in the first evaporation chamber and the second evaporation chamber, and improving the use convenience of the present application.

[0021] Further, sealing pressing strips are arranged on the side edges of the two sealing doors close to the evaporation tank.

[0022] Description: The sealing pressing strips are arranged to improve the air tightness of the evaporation tank, thereby reducing the heat loss of the evaporation tank.

[0023] Further, temperature sensors are arranged in the first evaporation chamber and the second evaporation chamber, and a PLC controller electrically connected to the temperature sensors is arranged on the outer wall of the evaporation tank.

[0024] Description: The temperature sensors and the PLC controller are arranged to facilitate the accurate control of the heating temperature of the materials in the first evaporation chamber and the second evaporation chamber, thereby improving the production efficiency of sodium chloride and sodium sulfate.

[0025] The present application also provides an integrated evaporation and crystallization method for the production of sodium chloride and sodium sulfate, based on the above-mentioned integrated evaporation and crystallization device for the production of sodium chloride and sodium sulfate, comprising the following steps:

[0026] S1, respectively connecting the heating member, the circulating pump, the control valve and the heating disc to an external power supply;

[0027] S2, passing the wastewater into the preheating tank through the feeding pipe, heating the wastewater by the heating member, and circulating the wastewater into the preheating tank by the circulating pump until the wastewater is preheated to 30-45℃, the steam generated in the heating process enters the condensing box through the first steam pipe;

[0028] S3, opening the control valve, transferring the preheated wastewater into the first evaporation chamber through the transfer pipe by the circulating pump, heating the wastewater to 50-70℃ by the heating disc in the first evaporation chamber, and heat preservation treatment until sodium sulfate crystals are precipitated; then separating the sodium sulfate crystals from the concentrated liquid, and transferring the separated concentrated liquid into the second evaporation chamber, heating the concentrated liquid to 70-150℃ by the heating disc in the second evaporation chamber, and heat preservation treatment until sodium chloride crystals are precipitated;

[0029] S4, the first evaporation chamber, the second evaporation chamber inside the hot steam discharged respectively through the second steam pipe into the condensing box inside, the hot steam is cooled to form water drops under the action of condensing plate, and flows into the water collecting tank, then the condensed water is discharged through the drain pipe on the condensing box, that is, finally the sodium chloride crystals and sodium sulfate crystals are transferred through the sealing door on the evaporation tank.

[0030] Compared with the prior art, the beneficial effects of the present application are reflected in the following points:

[0031] Firstly, the device structure of the present application is reasonable, which not only realizes the purification treatment of industrial high-salinity wastewater, improves the safety of industrial wastewater discharge, but also makes the sodium chloride and sodium sulfate in the high-salinity wastewater be resourceized, reduces the use cost of sodium chloride and sodium sulfate, and has certain economic benefits.

[0032] Secondly, the present application shortens the crystallization precipitation time of sodium chloride and sodium sulfate by preheating the industrial wastewater, thereby improving the production efficiency of sodium chloride and sodium sulfate; at the same time, the evaporated water can be used twice after being recovered, saving water resources.

[0033] Thirdly, the present application sets the stirring disc inside the evaporation tank, which not only can improve the contact area of wastewater and crystallization seat, improve the evaporation efficiency, but also can avoid the dangerous accidents caused by caking of sodium chloride and sodium sulfate during crystallization precipitation, improving the safety of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is the longitudinal sectional view of the device of the present application;

[0035] Figure 2 is the front view of the device of the present application;

[0036] Figure 3 is the connection schematic diagram of the heating water jacket and the preheating tank of the present application;

[0037] Figure 4 is the connection schematic diagram of the shunt disc and the preheating tank of the present application;

[0038] Figure 5 is the structure schematic diagram of the condensing plate of the present application;

[0039] Figure 6 is the connection schematic diagram of the cam and the condensing plate of the present application;

[0040] Figure 7 is the connection schematic diagram of the sealing door and the evaporation tank of the present application;

[0041] Figure 8 is the structure schematic diagram of the sealing door of the present application;

[0042] Figure 9 A schematic diagram showing the connection between the opening plate and the evaporator of the present invention;

[0043] Among them, 1-preheating component, 10-preheating tank, 100-feed pipe, 101-circulation pipe, 11-heating component, 110-heating water jacket, 111-electric heating coil, 112-sloping baffle, 12-circulation pump, 13-diverter plate, 130-diverter hole, 2-condensing component, 20-condensing box, 200-first steam pipe, 21-condensing plate, 210-grooving, 211-water guide toothed plate, 22-water collection tank, 220-drain pipe, 23-rotating shaft, 230-cam, 231-connecting pulley, 24-rotating motor, 240-motor box, 3-evaporation junction Crystal assembly, 30-evaporator, 300-transfer tube, 301-first evaporation chamber, 302-second evaporation chamber, 303-second steam pipe, 31-crystallization seat, 32-heating plate, 33-sealing door, 330-arc sliding frame, 331-gear groove, 332-sealing strip, 34-stirring motor, 340-stirring shaft, 341-stirring plate, 35-opening plate, 350-sealing column, 351-lead screw, 3510-first bevel gear, 352-connecting arm, 36-auxiliary motor, 360-second bevel gear, 37-unloading motor, 370-small gear. Detailed Implementation

[0044] Example 1

[0045] like Figure 1 The integrated evaporation and crystallization device for the production of sodium chloride and sodium sulfate shown includes a preheating component 1, a condensation component 2 connected to the preheating component 1, and an evaporation and crystallization component 3 connected to the preheating component 1 and the condensation component 2 respectively. The preheating component 1 includes a preheating tank 10 and a heating element 11 disposed inside the preheating tank 10. A feed pipe 100 is provided at the top of the preheating tank 10, and a circulation pipe 101 connected to the feed pipe 101 is provided at the lower end of the side wall of the preheating tank 10. A circulation pump 12 is provided at the connection between the circulation pipe 101 and the preheating tank 10. The heating element 11 is a commercially available product.

[0046] like Figure 1 , 2 As shown, the condensing assembly 2 includes a condensing box 20 and four condensing plates 21 arranged side by side inside the condensing box 20; a first steam pipe 200 is provided at the bottom of one side of the condensing box 20 and connected to the upper part of the side wall of the preheating tank 10; each condensing plate 21 is inclined inside the condensing box 20, and a water collection tank 22 is provided inside the condensing box 20 and at the position corresponding to the lower side of each condensing plate 21; a drain pipe 220 is provided on the outer wall of the condensing box 20 and at the position corresponding to each water collection tank 22.

[0047] like Figure 1As shown, the evaporation crystallization assembly 3 includes an evaporation tank 30, a crystallization seat 31 arranged inside the evaporation tank 30, and a heating disc 32 arranged inside the evaporation tank 30 and located at the lower end of the crystallization seat 31; the upper end of the side wall of the evaporation tank 30 is connected with the circulating pipe 101 through a transfer pipe 300, and a control valve is arranged at the connection; the inside of the evaporation tank 30 is sequentially provided with a first evaporation chamber 301 and a second evaporation chamber 302 from top to bottom; the side wall of the evaporation tank 30 is provided with a second steam pipe 303 in communication with the first evaporation chamber 301 and the second evaporation chamber 302, respectively, and the second steam pipe 303 is connected with the other side bottom end of the condensing box 20; the crystallization seat 31 and the heating disc 32 are both provided with two, and the two crystallization seats 31 and the heating discs 32 are arranged one by one in the first evaporation chamber 301 and the second evaporation chamber 302, respectively; the side wall of the evaporation tank 30 and the positions corresponding to the first evaporation chamber 301 and the second evaporation chamber 302 are both movably provided with a sealing door 33.

[0048] Example 2

[0049] The embodiment describes an integrated evaporation crystallization method for sodium chloride and sodium sulfate production, based on the integrated evaporation crystallization device for sodium chloride and sodium sulfate production in Example 1, comprising the following steps:

[0050] S1, respectively, connect the heating member 11, the circulating pump 12, the control valve and the heating disc 32 with the external power supply;

[0051] S2, pass the wastewater into the preheating tank 10 through the feed pipe 100, heat the wastewater by using the heating member 11, and pass the steam generated in the heating process into the inside of the condensing box 20 through the first steam pipe 200; circulate the wastewater into the preheating tank 10 by using the circulating pump 12 until the wastewater is preheated to 30℃;

[0052] S3, open the control valve, transfer the preheated wastewater into the inside of the first evaporation chamber 301 by using the circulating pump 12; heat the wastewater to 50℃ by using the heating disc 32 in the first evaporation chamber 301, and perform heat preservation treatment until sodium sulfate crystals are precipitated; then separate the sodium sulfate crystals from the concentrated liquid, transfer the separated concentrated liquid into the inside of the second evaporation chamber 302, heat the concentrated liquid to 70℃ by using the heating disc 32 in the second evaporation chamber 302, and perform heat preservation treatment until sodium chloride crystals are precipitated;

[0053] S4, the hot steam discharged from the inside of the first evaporation chamber 301 and the second evaporation chamber 302 respectively enters the inside of the condensing box 20 through the second steam pipe 303; the hot steam is cooled and condensed into water droplets under the action of the condensing plate 21, and flows into the water collecting tank 22, and then the condensed water is discharged through the drain pipe 220 on the condensing box 20, and finally the sodium chloride crystals and the sodium sulfate crystals are transferred through the sealing door 33 on the evaporation tank 30.

[0054] Example 3

[0055] The difference between this embodiment and example 1 is that:

[0056] As shown in Figure 1 , 3 , 4, the heating member 11 includes three heating jackets 110 which are sequentially sleeved together and an electric heating coil 111 which is arranged at the bottom of the preheating tank 10; a water flow channel is arranged between each two adjacent heating jackets 110; a distribution plate 13 is arranged at the top of the preheating tank 10, and a plurality of distribution holes 130 are equidistantly distributed on the distribution plate 13; and a water supply pipe is arranged on the outer wall of the preheating tank 10 and connected with each heating jacket 110.

[0057] Example 4

[0058] This embodiment describes an integrated evaporation crystallization method for sodium chloride and sodium sulfate production, which is based on the integrated evaporation crystallization device for sodium chloride and sodium sulfate production of example 3, and differs from example 2 in that:

[0059] In step S1, the electric heating coil 111 is connected with an external power supply, and an external heat source is introduced into each heating jacket 110 through the water supply pipe;

[0060] In step S2, the wastewater entering the preheating tank is first heated when it passes through the distribution holes on the distribution plate 13 and enters the water flow channel between the two adjacent heating jackets 110, and the heat steam in the wastewater is discharged through the first steam pipe 200; when the wastewater falls to the bottom of the preheating tank 10, it is secondarily heated by the electric heating coil 111; until the wastewater is preheated to 40℃;

[0061] In step S3, the wastewater is heated to 60℃ by the heating disc 32 in the first evaporation chamber 301; and the concentrated liquid is heated to 120℃ by the heating disc 32 in the second evaporation chamber 302.

[0062] Example 5

[0063] The difference between this embodiment and example 3 is that:

[0064] As shown in Figure 2 , 5As shown in Figure 6, each condenser plate 21 is provided with a slot 210, and the slots 210 on two adjacent condenser plates 21 are staggered; each condenser plate 21 is provided with a water guide tooth plate 211 on its bottom surface; each condenser plate 21 is rotatably engaged with the inner wall of the condenser box 20, and each condenser plate 21 is provided with a return torsion spring at the connection between the condenser box 20 and the condenser box 20; a rotating shaft 23 is provided through the side wall of the condenser box 20, which is located below each condenser plate 21. One end of each rotating shaft 23 is provided with a cam 230 that abuts against the bottom surface of each condenser plate 21, and the other end of each rotating shaft 23 is provided with a connecting pulley 231. The connecting pulleys 231 are driven by a belt; a motor housing 240 is provided on the outer wall of the condenser box 20, located outside each connecting pulley 231. The motor housing 240 is provided with a rotary motor 24 that provides power to one of the connecting pulleys 231.

[0065] Example 6

[0066] This embodiment describes an integrated evaporation and crystallization method for the production of sodium chloride and sodium sulfate, based on the integrated evaporation and crystallization apparatus for the production of sodium chloride and sodium sulfate described in Embodiment 5. The difference between this method and Embodiment 4 is as follows:

[0067] In step S1, the rotary motor 24 is connected to an external power source;

[0068] In step S2, the wastewater is preheated to 45°C;

[0069] In step S3, the wastewater is heated to 70°C using the heating plate 32 inside the first evaporation chamber 301; the concentrate is heated to 150°C using the heating plate 32 inside the second evaporation chamber 302.

[0070] In step S4, as the hot steam moves upward inside the condenser 20, it pre-condenses into water droplets that adhere to the bottom surface of the condenser plate 21. The rotary motor 24 drives one of the connecting pulleys 231 to rotate, thereby causing all the rotating shafts 23 to rotate simultaneously. The cams 230 on the rotating shafts 23 continuously strike the condenser plate 21, causing the water droplets collected on the bottom surface of the condenser plate 21 to quickly enter the water collection tank 22 through the water guide tooth plate 211.

[0071] Example 7

[0072] The difference between this embodiment and embodiment 5 is that:

[0073] like Figure 1 As shown, a stirring motor 34 is provided at the top of the evaporator 30. A stirring shaft 340 is provided on the output shaft of the stirring motor 34, which passes through the first evaporation chamber 301 and the second evaporation chamber 302 respectively. A stirring disc 341 is sleeved on the stirring shaft 340 and located above the two crystallization seats 31 respectively.

[0074] likeFigure 9 As shown, the discharge hole is arranged on the crystallization seat 31 and the heating disc 32 inside the first evaporation chamber 301; the opening disc 35 is arranged on the top of the second evaporation chamber 302, the sealing column 350 is movably connected with the discharge hole on the opening disc 35, the lead screw 351 is rotatably connected on the inner wall of the second evaporation chamber 302, the first bevel gear 3510 is arranged on the bottom end of the lead screw 351; the opening disc 35 is threadedly connected with the lead screw 351 through the connecting arm 352; the auxiliary motor 36 is arranged on the outer wall of the evaporation tank 30, the output shaft of the auxiliary motor 36 penetrates through the evaporation tank 30, and the second bevel gear 360 is arranged on the output shaft and is in meshing connection with the first bevel gear 3510.

[0075] Example 8

[0076] The embodiment describes an integrated evaporation crystallization method for sodium chloride and sodium sulfate production, based on the integrated evaporation crystallization device for sodium chloride and sodium sulfate production in Example 7, which is different from Example 6 in that:

[0077] In step S1, the stirring motor 34 and the auxiliary motor 36 are connected with the external power supply;

[0078] In step S3, during the precipitation of sodium sulfate crystals and sodium chloride crystals, the stirring motor 34 drives the stirring disc 341 to rotate to continuously stir the generated wastewater; when it is necessary to transfer the concentrated liquid inside the first evaporation chamber 301 to the inside of the second evaporation chamber 302, the auxiliary motor 36 drives the second bevel gear 360 to rotate, the second bevel gear 360 and the first bevel gear 3510 are in meshing connection to make the lead screw 351 rotate, and the opening disc 35 moves downward under the action of the lead screw 351, so that the sealing column 350 is separated from the discharge hole, and the transfer of the concentrated liquid is realized.

[0079] Example 9

[0080] The embodiment is different from Example 7 in that:

[0081] As shown in Figure 7 , 8 two sealing doors 33 are movably connected with the evaporation tank 30 through the arc-shaped sliding frame 330, the gear grooves 331 are arranged on the side of the two sealing doors 33 close to each other; the discharging motor 37 is arranged on the outer wall of the evaporation tank 30 and between the two sealing doors 33, the motor shafts of the discharging motor 37 penetrate through the arc-shaped sliding frame 330, and the pinions 370 are arranged on the two motor shafts and are in meshing connection with the two gear grooves 331 one by one; the sealing pressing strips 332 are arranged on the side edges of the two sealing doors 33 close to the evaporation tank 30; the temperature sensors are arranged inside the first evaporation chamber 301 and the second evaporation chamber 302, and the PLC controller electrically connected with the temperature sensors is arranged on the outer wall of the evaporation tank 30.

[0082] Embodiment 10

[0083] The embodiment discloses an integrated evaporation crystallization method for sodium chloride and sodium sulfate production, and is different from the integrated evaporation crystallization device for sodium chloride and sodium sulfate production in embodiment 9 in that:

[0084] In step S1, the unloading motor 37 is connected with an external power supply, and each electrical equipment is electrically connected with the PLC controller;

[0085] In steps S2 and S3, the automatic operation of each electrical equipment is controlled by the PLC controller, and the heating temperature of the materials in the first evaporation chamber 301 and the second evaporation chamber 302 is monitored by the temperature sensor in real time.

[0086] In step S4, the unloading motor 37 is started by the PLC controller, the two pinions 370 are rotated by the unloading motor 37, so that the two sealing doors 33 move on the corresponding arc-shaped sliding frames 330, and the crystallization materials in the first evaporation chamber 301 and the second evaporation chamber 302 are transferred.

[0087] It should be noted that the PLC controller, the temperature sensor, the control valve, the electric heating pipe 111, the circulating pump 12, the rotating motor 24, the heating disc 32, the stirring motor 34, the auxiliary motor 36 and the unloading motor 37 used in the application all adopt the prior art, and are not specially limited here, and the corresponding products can be selected according to actual needs.

Claims

1. An integrated evaporation and crystallization apparatus for the production of sodium chloride and sodium sulfate, characterized in that, The system includes a preheating component (1), a condensing component (2) connected to the preheating component (1), and an evaporation and crystallization component (3) connected to the preheating component (1) and the condensing component (2), respectively. The preheating component (1) includes a preheating tank (10) and a heating element (11) disposed inside the preheating tank (10). A feed pipe (100) is provided at the top of the preheating tank (10), and a circulation pipe (101) connected to the feed pipe (100) is provided at the lower end of the side wall of the preheating tank (10). A circulation pump (12) is provided at the connection between the circulation pipe (101) and the preheating tank (10). The condensing assembly (2) includes a condensing box (20) and several condensing plates (21) arranged side by side inside the condensing box (20); a first steam pipe (200) is provided at the bottom of one side of the condensing box (20) and connected to the upper part of the side wall of the preheating tank (10); each of the condensing plates (21) is inclined inside the condensing box (20), and a water collection tank (22) is provided inside the condensing box (20) at a position corresponding to the lower side of each condensing plate (21); a drain pipe (220) is provided on the outer wall of the condensing box (20) at a position corresponding to each water collection tank (22). The evaporation crystallization assembly (3) includes an evaporator (30), a crystallization seat (31) disposed inside the evaporator (30), and a heating plate (32) disposed inside the evaporator (30) and located at the lower end of the crystallization seat (31). The upper end of the side wall of the evaporator (30) is connected to the circulation pipe (101) through a transfer pipe (300), and a control valve is provided at the connection. The evaporator (30) is provided with a first evaporation chamber (301) and a second evaporation chamber (302) from top to bottom. The side wall of the evaporator (30) is provided with a heating plate (32) respectively connected to the first evaporation chamber (301) and the second evaporation chamber (302). A second steam pipe (303) is connected to the first evaporation chamber (301) and the second evaporation chamber (302), and the second steam pipe (303) is connected to the bottom of the other side of the condenser (20); two crystallization seats (31) and two heating plates (32) are provided, and the two crystallization seats (31) and two heating plates (32) are respectively arranged in the first evaporation chamber (301) and the second evaporation chamber (302) respectively; a sealing door (33) is movably provided on the side wall of the evaporator (30) at the position corresponding to the first evaporation chamber (301) and the second evaporation chamber (302); The heating component (11) includes several heating water jackets (110) nested together in sequence and an electric heating coil (111) located at the bottom of the preheating tank (10); a water flow channel is provided between two adjacent heating water jackets (110); an inclined baffle (112) is provided inside the water flow channel; a diversion plate (13) is provided at the top of the preheating tank (10), and several diversion holes (130) are equidistantly distributed on the diversion plate (13); a water supply pipe connected to each heating water jacket (110) is provided on the outer wall of the preheating tank (10); The top of the evaporator (30) is equipped with a stirring motor (34), and the output shaft of the stirring motor (34) is equipped with a stirring shaft (340) that passes through the first evaporation chamber (301) and the second evaporation chamber (302) respectively. The stirring shaft (340) is fitted with a stirring plate (341) located above the two crystallization seats (31) respectively. The crystallizing seat (31) and heating plate (32) inside the first evaporation chamber (301) are both provided with discharge holes; the top of the second evaporation chamber (302) is provided with an opening plate (35), and the opening plate (35) is provided with a sealing column (350) that is movably inserted into the discharge hole; a lead screw (351) is rotatably engaged on the inner wall of the second evaporation chamber (302), and a first bevel gear (3510) is provided at the bottom end of the lead screw (351); the opening plate (35) is threadedly connected to the lead screw (351) through a connecting arm (352); an auxiliary motor (36) is provided on the outer wall of the evaporator (30), and the output shaft of the auxiliary motor (36) passes through the evaporator (30) and a second bevel gear (360) is provided on the output shaft that meshes with the first bevel gear (3510).

2. The integrated evaporation and crystallization apparatus for the production of sodium chloride and sodium sulfate according to claim 1, characterized in that, Each of the condensing plates (21) is provided with a slot (210), and the slots (210) on two adjacent condensing plates (21) are intersected; each of the condensing plates (21) is provided with a water guide tooth plate (211) on its bottom surface.

3. The integrated evaporation and crystallization apparatus for the production of sodium chloride and sodium sulfate according to claim 1, characterized in that, Each of the condensing plates (21) is rotatably engaged with the inner wall of the condensing box (20), and a return torsion spring is provided at the connection between each condensing plate (21) and the condensing box (20); a rotating shaft (23) is provided through the side wall of the condensing box (20) and located below each condensing plate (21); one end of each rotating shaft (23) is provided with a cam (230) that abuts against the bottom surface of each condensing plate (21); the other end of each rotating shaft (23) is provided with a connecting pulley (231); the connecting pulleys (231) are driven by a belt; a motor housing (240) is provided on the outer wall of the condensing box (20) and located outside each connecting pulley (231); a rotary motor (24) is provided on the motor housing (240) to provide power to one of the connecting pulleys (231).

4. The integrated evaporation and crystallization apparatus for the production of sodium chloride and sodium sulfate according to claim 1, characterized in that, The two sealing doors (33) are movably connected to the evaporator (30) through the arc-shaped sliding frame (330). The two sealing doors (33) are provided with gear grooves (331) on the side that is close to each other. A discharge motor (37) is provided on the outer wall of the evaporator (30) and between the two sealing doors (33). Both ends of the discharge motor (37) are provided with motor shafts that pass through the arc-shaped sliding frame (330), and both motor shafts are provided with small gears (370) that mesh with the two gear grooves (331) respectively.

5. The integrated evaporation and crystallization apparatus for the production of sodium chloride and sodium sulfate according to claim 4, characterized in that, Both of the sealing doors (33) are provided with sealing strips (332) on the side edge near the evaporator (30).

6. An integrated evaporation and crystallization method for the production of sodium chloride and sodium sulfate, using the integrated evaporation and crystallization apparatus for the production of sodium chloride and sodium sulfate as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Connect the heating element (11), circulation pump (12), control valve and heating plate (32) to the external power supply respectively; S2. Wastewater is fed into the preheating tank (10) through the feed pipe (100). The wastewater is heated by the heating component (11). The steam generated during the heating process enters the condenser (20) through the first steam pipe (200). The wastewater is circulated into the preheating tank (10) by the circulation pump (12) until the wastewater is preheated to 30~45℃. S3. Open the control valve and use the circulating pump (12) to transfer the preheated wastewater to the first evaporation chamber (301) through the transfer pipe (300); use the heating plate (32) inside the first evaporation chamber (301) to heat the wastewater to 50~70℃ and keep it warm until sodium sulfate crystals precipitate; then separate the sodium sulfate crystals from the concentrate and transfer the separated concentrate to the second evaporation chamber (302); use the heating plate (32) inside the second evaporation chamber (302) to heat the concentrate to 70~150℃ and keep it warm until sodium chloride crystals precipitate. S4. The hot steam discharged from the first evaporation chamber (301) and the second evaporation chamber (302) enters the condenser (20) through the second steam pipe (303). The hot steam cools down and condenses into water droplets under the action of the condenser plate (21), and flows into the water collection tank (22). Then, the condensate is discharged through the drain pipe (220) on the condenser (20). Finally, the sodium chloride crystals and sodium sulfate crystals are transferred through the sealing door (33) on the evaporator (30).

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