Multi-effect evaporative crystallization system

Abstract

The utility model relates to the technical field of evaporation and crystallization, in particular to a multi-effect evaporation and crystallization system which comprises a plurality of evaporation tanks with the same structure, exhaust pipes and drain valves are arranged on the evaporation tanks, evaporation barrels communicated with the drain valves are arranged in the evaporation tanks, the top openings of the evaporation barrels are sleeved with spacer rings, and the spacer rings abut against the inner side walls of the evaporation tanks. A gas conveying pipe is communicated between the exhaust pipe of the previous evaporation tank and the inner side wall below the spacer ring of the next evaporation tank in the steam flowing direction, a pressure equalizing pipe is communicated between the second evaporation tank and the next evaporation tank in the steam flowing direction, the pressure equalizing pipe is located below the spacer ring, a liquid inlet pipe is arranged on the evaporation tank, and a liquid outlet pipe is arranged on the liquid inlet pipe. A steam plate is arranged in the evaporation tank and located above the evaporation barrels, an adsorption pipe is communicated between the steam plate and the exhaust pipe, a dehydration assembly is arranged on the adsorption pipe, and a heating piece for heating the evaporation barrel in the foremost evaporation tank is arranged on the foremost evaporation tank. The solution concentration device has the effect of improving the solution concentration efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of evaporation and crystallization, and in particular to a multi-effect evaporation and crystallization system. Background Art

[0002] Evaporation crystallization technology has been widely used in the chemical, pharmaceutical and other industries. It can be used to concentrate high-concentration wastewater or solutions to facilitate subsequent treatment.

[0003] At present, there are some multi-effect evaporation crystallization systems on the market. These systems connect multiple evaporators in series and use the secondary steam generated by the previous effect evaporator as the heating source for the next effect evaporator, thereby realizing the cascade utilization of energy.

[0004] Since the two adjacent evaporators are usually transported through pipelines, the secondary steam generated by the previous effect evaporator contains a large amount of water vapor, which causes the secondary steam generated by the previous effect evaporator to condense in the pipeline. The condensed liquid will flow back to the previous effect evaporator along the pipeline, reducing the evaporation efficiency of the previous effect evaporator, which has some shortcomings. Utility Model Content

[0005] In order to improve the problem of steam condensing in the pipeline and flowing back to the evaporator, the present application provides a multi-effect evaporation crystallization system.

[0006] The multi-effect evaporation crystallization system provided in this application adopts the following technical solution:

[0007] The evaporator of claim 1, wherein the valve body has an inlet pipe and a outlet pipe, and the outlet pipe is connected to the valve body by a thread-through hole. The evaporator of claim 1, wherein the valve body has an outlet pipe and a outlet pipe is connected to the valve body. The evaporator of claim 1, wherein the outlet pipe is connected to the valve body by a thread-through hole.

[0008] By adopting the above technical scheme, workers inject solutions requiring different evaporation temperatures into the evaporating cylinders of the evaporating tank in order from high to low temperature through the liquid inlet pipe, and then the heating element heats the evaporating cylinder in the first evaporating tank. The evaporating cylinder in the first evaporating tank generates a large amount of moist hot steam that flows to the adsorption tube. The dehydration component on the adsorption tube adsorbs the moisture in the steam to reduce the condensation and reflux of the moist hot steam. The hot steam flows to the next evaporating tank through the gas pipe and heats the evaporating cylinder. At the same time, part of the hot steam flows to the next evaporating tank of the evaporating tank through the pressure equalizing pipe. At the same time, the moist hot steam generated in the evaporating tank is dehydrated by the adsorption tube and also flows into the next evaporating tank, thereby realizing multi-stage utilization of heat, which is beneficial to reducing energy consumption.

[0009] Optionally, the heating element includes a heater arranged on the first evaporation tank, the heater is electrically connected to the control system, and a heating tube is wound around the evaporation tube in the first evaporation tank, and the heating tube is electrically connected to the heater.

[0010] By adopting the above technical solution, workers start the heater through the control system, and the heater passes electric current to make the heating tube heat the evaporating cylinder, which is convenient for workers to control the heating temperature.

[0011] Optionally, the dehydration component includes an adsorption box connected to the adsorption tube, the top and bottom of the adsorption box separate the adsorption tube, a lower support plate is provided on the adsorption tube located at the bottom of the adsorption box, there is a spacing between the lower support plate and the inner bottom wall of the adsorption box, a lower row of holes is provided on the lower support plate, an upper pressure plate is slidably provided on the adsorption box, an adsorption sponge is provided on the upper pressure plate, an upper row of holes is provided on the upper pressure plate, a sealing plate is slidably provided on the upper pressure plate, a compression spring is supported between the sealing plate and the upper pressure plate, the sealing plate is used to seal the adsorption tube located at the bottom of the adsorption box, and a driving member for driving the upper pressure plate to move is provided on the evaporator.

[0012] By adopting the above technical solution, hot steam flows in from the adsorption sponge and then flows out from the upper holes. As the adsorption sponge absorbs more and more water vapor, the worker drives the upper pressure plate close to the lower support plate through the driving member until the sealing plate blocks the adsorption tube. As the upper pressure plate continues to approach the lower support plate, the compression spring is compressed and deformed. At the same time, the adsorption sponge is squeezed by the upper pressure plate and the lower support plate. The water adsorbed in the adsorption sponge is squeezed and discharged from the lower holes on the lower support plate. The squeezed water is temporarily stored in the inner bottom of the adsorption box, thereby realizing the dehydration of the humid hot steam in the adsorption tube.

[0013] Optionally, the driving member includes a mounting plate arranged on the evaporation tank, a driving cylinder electrically connected to a control system is arranged on the mounting plate, a piston rod of the driving cylinder slides into the adsorption box, and the upper pressure plate is arranged on the piston rod of the driving cylinder.

[0014] By adopting the above technical solution, workers start the driving cylinder through the control system, and the driving cylinder realizes the movement of the upper pressure plate through its piston rod, which is conducive to reducing the labor intensity of workers.

[0015] Optionally, a liquid collecting box is arranged outside the evaporation tank, and a drainage pipe is connected between the liquid collecting box and the inner bottom wall of the adsorption box.

[0016] By adopting the above technical solution, the water squeezed out of the liquid collecting box can be discharged into the liquid collecting box through the drain pipe in time, which is beneficial to improving the squeezing and drainage effect of the subsequent adsorption sponge, and at the same time it is convenient for workers to reuse the squeezed water.

[0017] Optionally, a plurality of adsorption boxes are arranged in the evaporation tank, and a transfer ring box is sleeved on the evaporation tank. The transfer ring box separates the drain pipe and is connected to the drain pipe.

[0018] By adopting the above technical solution, the transfer ring box is helpful to reduce the disorderly arrangement of the drainage pipes.

[0019] Optionally, an air pump electrically connected to a control system is provided on the air delivery pipe, and a diameter of the air delivery pipe is larger than a diameter of the pressure equalizing pipe.

[0020] By adopting the above technical solution, workers start the air pump through the control system, and the air pump exhausts the hot steam in the adsorption box through the air pipe, which is helpful to speed up the efficiency of hot steam passing through the adsorption sponge.

[0021] Optionally, each of the evaporation tanks after the second evaporation tank along the steam flow direction is provided with a spiral guide vane, and the spiral guide vane is wound around the evaporation cylinder.

[0022] The adoption of the above technical solution is conducive to prolonging the heating time of the evaporation cylinder and further improving the efficiency of solution evaporation.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. Workers inject solutions that require different evaporation temperatures into the evaporation cylinders of the evaporation tanks in descending order of temperature through the liquid inlet pipe, and then the heating element heats the evaporation cylinder in the first evaporation tank. The evaporation cylinder in the first evaporation tank generates a large amount of moist hot steam that flows to the adsorption tube. The dehydration component on the adsorption tube adsorbs the moisture in the steam to reduce the condensation and reflux of the moist hot steam. The hot steam flows to the next evaporation tank through the gas transmission pipe and heats the evaporation cylinder. At the same time, part of the hot steam flows to the next evaporation tank of the evaporation tank through the pressure equalizing pipe. At the same time, the moist hot steam generated in the evaporation tank is dehydrated by the adsorption tube and flows into the next evaporation tank, thereby realizing multi-stage utilization of heat, which is conducive to reducing energy consumption;

[0025] 2. Hot steam flows in from the adsorption sponge and then flows out from the upper row holes. As the adsorption sponge absorbs more and more water vapor, the worker drives the upper pressure plate close to the lower support plate through the driving part until the sealing plate blocks the adsorption tube. As the upper pressure plate continues to approach the lower support plate, the compression spring is compressed and deformed. At the same time, the adsorption sponge is squeezed by the upper pressure plate and the lower support plate. The water adsorbed in the adsorption sponge is squeezed and discharged from the lower row holes on the lower support plate. The squeezed water is temporarily stored in the inner bottom of the adsorption box, thereby realizing the dehydration of the hot and humid steam in the adsorption tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application.

[0027] Figure 2 It is a cross-sectional view showing the positional relationship among the evaporation tank, the evaporation cylinder and the pressure equalizing tube in the embodiment of the present application.

[0028] Figure 3 yes Figure 2 Enlarged view of part A.

[0029] Explanation of the reference numerals in the accompanying drawings: 1. evaporator; 2. exhaust pipe; 3. drain valve; 4. evaporator cylinder; 5. spacer ring; 6. gas pipe; 7. pressure equalizing pipe; 8. liquid inlet pipe; 9. steam plate; 10. adsorption pipe; 11. dehydration assembly; 111. adsorption box; 112. lower support plate; 113. lower row holes; 114. upper pressure plate; 115. adsorption sponge; 116. upper row holes; 117. sealing plate; 118. compression spring; 119. driving member; 1191. mounting plate; 1192. driving cylinder; 12. heating member; 121. heater; 122. heating pipe; 13. liquid collecting box; 14. drain pipe; 15. transfer ring box; 16. air pump; 17. spiral guide vane; 18. guide rod; 19. drain valve. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-Figure 3 This application is described in further detail.

[0031] The embodiment of the present application discloses a multiple-effect evaporation crystallization system.

[0032] Reference Figure 1 A multi-effect evaporation crystallization system includes a plurality of vertical evaporation tanks 1 with the same structure. The top of the evaporation tank 1 is connected with an exhaust pipe 2, and the bottom is connected with a drain valve 3. An evaporation cylinder 4 connected with the drain valve 3 is coaxially arranged in the evaporation tank 1. A spacer ring 5 is sleeved at the top opening of the evaporation cylinder 4. The diameter of the spacer ring 5 gradually increases along the direction from the drain valve 3 to the evaporation cylinder 4, and the spacer ring 5 abuts against the inner wall of the evaporation tank 1.

[0033] Reference Figure 1 , Figure 2 and Figure 3 Along the steam flow direction, the exhaust pipe 2 of the previous evaporator 1 and the bottom of the next evaporator 1 are both connected by an air delivery pipe 6, and the connection between the bottom of the evaporator 1 and the air delivery pipe 6 is located below the partition ring 5. An air pump 16 electrically connected to the control system is arranged on the air delivery pipe 6. Along the steam flow direction, the second evaporator 1 and the next evaporator 1 are both connected by an equalizing pressure pipe 7, and the diameter of the air delivery pipe 6 is larger than the diameter of the equalizing pressure pipe 7.

[0034] Reference Figure 1 , Figure 2 and Figure 3 The connection point between the pressure equalizing pipe 7 and the evaporation tank 1 is located below the partition ring 5. Along the steam flow direction, spiral guide vanes 17 are arranged in the evaporation tanks 1 after the second evaporation tank 1. The spiral guide vanes 17 are wound around the evaporation tube 4. A liquid inlet pipe 8 is connected to the evaporation tank 1 and located above the evaporation tube 4. A steam plate 9 is bolted to the evaporation tank 1 and located above the liquid inlet pipe 8. An adsorption tube 10 is connected between the steam plate 9 and the exhaust pipe 2.

[0035] Reference Figure 1 , Figure 2 and Figure 3 A dehydration assembly 11 is arranged on the adsorption tube 10, and the dehydration assembly 11 is used to remove moisture from the steam. A heating element 12 is arranged on the first evaporation tank 1 to heat the evaporation tube 4 therein, and the heating element 12 includes a heater 121 bolted to the first evaporation tank 1, and the heater 121 is electrically connected to the control system. A heating pipe 122 is wound around the evaporation tube 4 in the first evaporation tank 1, and the heating pipe 122 is electrically connected to the heater 121.

[0036] The worker arranges the solutions with different evaporation temperatures in order from high to low temperature, and injects the solutions into the evaporation tube 4 of the evaporation tank 1 in sequence through the liquid inlet pipe 8 along the steam flow direction. Then the worker starts the heater 121 through the control system. The heater 121 passes current to make the heating tube 122 heat the evaporation tube 4. The evaporation tube 4 in the front evaporation tank 1 is heated, and the solution in the evaporation tube 4 evaporates to generate a large amount of hot and humid steam, and the air pressure in the evaporation tank 1 increases.

[0037] The worker starts the air pump 16 through the control system. The air pump 16 draws air into the evaporation tank 1 through the air pipe 6 and the adsorption tube 10. The humid hot steam in the evaporation tank 1 is drawn to the adsorption tube 10. The dehydration component 11 on the adsorption tube 10 adsorbs the moisture in the steam. The dehydrated hot steam flows into the next evaporation tank 1 through the air pipe 6. Under the obstruction of the spiral guide plate 17, the hot steam heats the evaporation cylinder 4 in the next evaporation tank 1.

[0038] Part of the hot steam in the next evaporation tank 1 flows to the next evaporation tank 1 of the evaporation tank 1 through the pressure equalizing pipe 7. At the same time, the hot steam heats the evaporation tube 4 in the evaporation tank 1. The humid hot steam generated by the heating of the solution in the evaporation tube 4 also flows into the next evaporation tank 1 after being dehydrated through the adsorption tube 10 of the evaporation tank 1, and heats the evaporation tube 4 in the next evaporation tank 1. The subsequent evaporation tanks 1 repeat the above process.

[0039] Reference Figure 1 , Figure 2 and Figure 3 The dehydration component 11 includes an adsorption box 111 connected to the adsorption tube 10. The top and bottom of the adsorption box 111 separate the adsorption tube 10. A lower support plate 112 is welded on the adsorption tube 10 at the bottom of the adsorption box 111. There is a distance between the lower support plate 112 and the inner bottom wall of the adsorption box 111. The lower support plate 112 is provided with lower row holes 113.

[0040] Reference Figure 1 , Figure 2 and Figure 3 A liquid collecting box 13 is welded outside the evaporation tank 1, and a drain pipe 14 is connected between the liquid collecting box 13 and the inner bottom wall of the adsorption box 111. A plurality of adsorption boxes 111 are arranged in the evaporation tank 1. A transfer ring box 15 is sleeved on the evaporation tank 1. The transfer ring box 15 separates the drain pipe 14 and is connected to the drain pipe 14. A drain valve 19 is arranged on the drain pipe 14 between the transfer ring box 15 and the liquid collecting box 13.

[0041] Reference Figure 1 , Figure 2 and Figure 3An upper pressing plate 114 is vertically slidably arranged in the adsorption box 111, an adsorption sponge 115 is bonded to the bottom of the upper pressing plate 114, an upper row of holes 116 is opened on the upper pressing plate 114, a guide rod 18 is vertically slidably arranged on the upper pressing plate 114, a sealing plate 117 is welded to the bottom of the guide rod 18, a compression spring 118 is supported between the sealing plate 117 and the upper pressing plate 114, and the sealing plate 117 is used to block the adsorption tube 10 located at the bottom of the adsorption box 111, and a driving member 119 for driving the upper pressing plate 114 to move is arranged on the evaporator 1.

[0042] Reference Figure 1 , Figure 2 and Figure 3 The driving member 119 includes a mounting plate 1191 welded to the top of the evaporator 1, a driving cylinder 1192 electrically connected to the control system is bolted to the mounting plate 1191, the piston rod of the driving cylinder 1192 slides into the adsorption box 111, the upper pressure plate 114 is welded to the piston rod of the driving cylinder 1192, and the guide rod 18 is coaxially plugged into the piston rod of the driving cylinder 1192.

[0043] When the hot and humid steam flows into the adsorption box 111 through the adsorption tube 10, the adsorption sponge 115 in the adsorption box 111 absorbs moisture in the hot and humid steam. After the adsorption sponge 115 adsorbs moisture for a period of time, the worker starts the driving cylinder 1192. The driving cylinder 1192 pushes the upper pressure plate 114 close to the lower support plate 112 until the sealing plate 117 blocks the adsorption tube 10. As the upper pressure plate 114 continues to approach the lower support plate 112, the compression spring 118 is compressed and deformed.

[0044] At the same time, the adsorption sponge 115 is squeezed by the upper pressure plate 114 and the lower support plate 112, and the water adsorbed in the adsorption sponge 115 is squeezed and discharged from the lower discharge hole 113 on the lower support plate 112. The squeezed water flows to the inner bottom of the adsorption box 111, passes through the drain pipe 14, and the water in the adsorption box 111 flows to the transfer ring box 15, and then flows from the transfer ring box 15 to the collecting tank 13.

[0045] The implementation principle of a multi-effect evaporation crystallization system in an embodiment of the present application is as follows: a worker arranges solutions with different evaporation temperatures in order of temperature from high to low, and injects the solutions into the evaporation tube 4 of the evaporation tank 1 in sequence through the liquid inlet pipe 8 along the steam flow direction, and then the worker starts the heater 121 through the control system, and the heater 121 passes current to make the heating tube 122 heat the evaporation tube 4, the evaporation tube 4 in the front evaporation tank 1 is heated, the solution in the evaporation tube 4 evaporates to generate a large amount of hot and humid steam, and the air pressure in the evaporation tank 1 increases.

[0046] The worker starts the air pump 16 through the control system. The air pump 16 draws air into the evaporation tank 1 through the air pipe 6 and the adsorption tube 10. The humid hot steam in the evaporation tank 1 is drawn to the adsorption tube 10. The dehydration component 11 on the adsorption tube 10 adsorbs the moisture in the steam. The dehydrated hot steam flows into the next evaporation tank 1 through the air pipe 6. Under the obstruction of the spiral guide plate 17, the hot steam heats the evaporation cylinder 4 in the next evaporation tank 1.

[0047] Part of the hot steam in the next evaporation tank 1 flows to the next evaporation tank 1 of the evaporation tank 1 through the pressure equalizing pipe 7. At the same time, the hot steam heats the evaporation tube 4 in the evaporation tank 1. The humid hot steam generated by the heating of the solution in the evaporation tube 4 also flows into the next evaporation tank 1 after being dehydrated through the adsorption tube 10 of the evaporation tank 1, and heats the evaporation tube 4 in the next evaporation tank 1. The subsequent evaporation tanks 1 repeat the above process.

[0048] When the hot and humid steam flows into the adsorption box 111 through the adsorption tube 10, the adsorption sponge 115 in the adsorption box 111 absorbs moisture in the hot and humid steam. After the adsorption sponge 115 adsorbs moisture for a period of time, the worker starts the driving cylinder 1192. The driving cylinder 1192 pushes the upper pressure plate 114 close to the lower support plate 112 until the sealing plate 117 blocks the adsorption tube 10. As the upper pressure plate 114 continues to approach the lower support plate 112, the compression spring 118 is compressed and deformed.

[0049] At the same time, the adsorption sponge 115 is squeezed by the upper pressure plate 114 and the lower support plate 112, and the water adsorbed in the adsorption sponge 115 is squeezed and discharged from the lower discharge hole 113 on the lower support plate 112. The squeezed water flows to the inner bottom of the adsorption box 111, passes through the drain pipe 14, and the water in the adsorption box 111 flows to the transfer ring box 15, and then flows from the transfer ring box 15 to the collecting tank 13.

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A multiple-effect evaporation crystallization system, characterized in that: The invention comprises a plurality of evaporation tanks (1) having the same structure, wherein the top of the evaporation tank (1) is provided with an exhaust pipe (2) and the bottom is provided with a drain valve (3), an evaporation tube (4) in communication with the drain valve (3) is provided inside the evaporation tank (1), a spacer ring (5) is sleeved at the top opening of the evaporation tube (4), the spacer ring (5) is in contact with the inner side wall of the evaporation tank (1), an air delivery pipe (6) is connected between the exhaust pipe (2) of the preceding evaporation tank (1) and the inner side wall below the spacer ring (5) of the succeeding evaporation tank (1) in the direction of steam flow, and a second evaporation tank (1) and the inner side wall below the spacer ring (5) are connected in the direction of steam flow. The following evaporation tanks (1) are connected to each other with a pressure equalizing pipe (7), the pressure equalizing pipe (7) is located below the partition ring (5), the evaporation tank (1) is provided with a liquid inlet pipe (8), a steam plate (9) is provided inside the evaporation tank (1) and above the evaporation tube (4), an adsorption tube (10) is connected between the steam plate (9) and the exhaust pipe (2), a dehydration component (11) is provided on the adsorption tube (10), the dehydration component (11) is used to remove water from the steam, and the front evaporation tank (1) is provided with a heating element (12) for heating the evaporation tube (4) therein.

2. A multiple-effect evaporation crystallization system according to claim 1, characterized in that: The heating element (12) comprises a heater (121) arranged on the front evaporation tank (1), the heater (121) being electrically connected to a control system, and a heating tube (122) being wound around the evaporation cylinder (4) in the front evaporation tank (1), the heating tube (122) being electrically connected to the heater (121).

3. A multiple-effect evaporation crystallization system according to claim 1, characterized in that: The dehydration component (11) comprises an adsorption box (111) connected to the adsorption tube (10); the top and bottom of the adsorption box (111) separate the adsorption tube (10); a lower support plate (112) is provided on the adsorption tube (10) at the bottom of the adsorption box (111); a spacing exists between the lower support plate (112) and the inner bottom wall of the adsorption box (111); a lower row of holes (113) is provided on the lower support plate (112); an upper pressing plate (114) is slidably provided on the adsorption box (111); An adsorption sponge (115) is arranged on the upper pressure plate (114), an upper row of holes (116) is opened on the upper pressure plate (114), a blocking plate (117) is slidably arranged on the upper pressure plate (114), a compression spring (118) is supported between the blocking plate (117) and the upper pressure plate (114), the blocking plate (117) is used to block the adsorption tube (10) located at the bottom of the adsorption box (111), and a driving member (119) for driving the upper pressure plate (114) to move is arranged on the evaporation tank (1).

4. A multiple-effect evaporation crystallization system according to claim 3, characterized in that: The driving member (119) comprises a mounting plate (1191) arranged on the evaporation tank (1); a driving cylinder (1192) electrically connected to a control system is arranged on the mounting plate (1191); a piston rod of the driving cylinder (1192) slides into the adsorption box (111); and the upper pressure plate (114) is arranged on the piston rod of the driving cylinder (1192).

5. A multiple-effect evaporation crystallization system according to claim 3, characterized in that: A liquid collecting box (13) is arranged outside the evaporation tank (1), and a drainage pipe (14) is connected between the liquid collecting box (13) and the inner bottom wall of the adsorption box (111).

6. A multiple-effect evaporation crystallization system according to claim 5, characterized in that: A plurality of adsorption boxes (111) are arranged in the evaporation tank (1). A transfer ring box (15) is sleeved on the evaporation tank (1). The transfer ring box (15) separates the drainage pipe (14) and is in communication with the drainage pipe (14).

7. A multiple-effect evaporation crystallization system according to claim 1, characterized in that: The gas delivery pipe (6) is provided with an air pump (16) electrically connected to a control system, and the diameter of the gas delivery pipe (6) is greater than the diameter of the pressure equalizing pipe (7).

8. A multiple-effect evaporation crystallization system according to claim 1, characterized in that: A spiral guide vane (17) is provided in each of the evaporation tanks (1) after the second evaporation tank (1) along the steam flow direction, and the spiral guide vane (17) is wound around the evaporation cylinder (4).

Images