Refrigerant-free temperature control type multi-effect distillation water machine

Abstract

The utility model discloses a kind of multi-effect distilled water machines of refrigerantless temperature control type, including buffer tank, water pump, condenser, water production pipeline and multi-effect distillation device;Wherein, the condenser has condensing shell, upper layer heat exchange pipe and lower layer heat exchange pipe, the upper layer heat exchange pipe and the lower layer heat exchange pipe are all installed in the condensing shell, the upper layer heat exchange pipe is located above the lower layer heat exchange pipe, the upper end portion of the condensing shell has feed inlet, the lower end portion of the condensing shell has discharge port, the inlet of the water pump is connected with the outlet of the buffer tank, the outlet of the water pump is connected with the inlet of the upper layer heat exchange pipe and the inlet of the lower layer heat exchange pipe respectively, the outlet of the lower layer heat exchange pipe is connected with the buffer tank. The utility model can replace the heat of steam into condenser into raw material water, can improve the recycling rate of heat in steam, avoid the heat in steam is wasted, and can also reduce the investment of equipment and reduce energy consumption.

Description

Technical Field

[0001] This utility model relates to a refrigerant-free temperature-controlled multi-effect distilled water machine. Background Technology

[0002] Currently, multi-effect water distillers are devices used to prepare water for injection. These distillers require a condenser to condense and liquefy clean steam to obtain water for injection. For example, the integrated electrically heated multi-effect distiller disclosed in Chinese Patent No. CN209411827U uses a condenser to condense and liquefy clean steam to obtain water for injection. However, existing multi-effect water distillers typically require a cooling water supply to the condenser to exchange heat with the clean steam entering the condenser. After heat exchange, the clean steam temperature decreases and condenses to form water for injection, while the cooling water temperature increases, necessitating a chiller unit for circulating cooling. This structure not only leads to the heat of the steam in the condenser being carried away by the cooling water, resulting in heat waste, but also requires an additional chiller unit, increasing equipment investment. Furthermore, the chiller unit consumes additional electricity, increasing energy consumption. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a refrigerant-free temperature-controlled multi-effect distillation water machine. It can replace the heat of the steam entering the condenser with the raw water, improve the heat recovery and utilization rate of the steam, avoid the waste of heat in the steam, and also reduce equipment investment and energy consumption.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a refrigerant-free temperature-controlled multi-effect distillation water machine, including a buffer tank, a water pump, a condenser, a water production pipeline and a multi-effect distillation device;

[0005] The condenser has a condensing shell, an upper heat exchange tube, and a lower heat exchange tube. Both the upper and lower heat exchange tubes are installed in the condensing shell. The upper heat exchange tube is located above the lower heat exchange tube. The upper end of the condensing shell has a feed inlet, and the lower end of the condensing shell has a discharge outlet.

[0006] The inlet of the water pump is connected to the outlet of the buffer tank, the outlet of the water pump is connected to the inlet of the upper heat exchange tube and the inlet of the lower heat exchange tube respectively, and the outlet of the lower heat exchange tube is connected to the buffer tank.

[0007] The input end of the multi-effect distillation device is connected to the outlet of the upper heat exchange tube. The multi-effect distillation device is used to receive the raw water in the upper heat exchange tube and heat and evaporate the raw water to form steam.

[0008] The feed inlet on the condenser shell is connected to the output end of the multi-effect distillation device and is used to receive the steam generated by evaporation in the multi-effect distillation device.

[0009] The water production pipeline is connected to the discharge port on the condenser shell.

[0010] Furthermore, a one-way valve is connected to the upper heat exchange tube.

[0011] Furthermore, the outlet of the lower heat exchange tube is connected to the buffer tank via a return pipeline, and a regulating valve for adjusting the flow rate is connected in the return pipeline.

[0012] Furthermore, the refrigerant-free temperature-controlled multi-effect distilled water machine also includes a temperature sensor and a controller;

[0013] The temperature sensor is connected to the water production pipeline and is used to detect the water temperature in the water production pipeline;

[0014] The temperature sensor is connected to the controller and sends the measured water temperature information in the water production pipeline to the controller;

[0015] The controller is connected to the regulating valve and is used to control the opening degree of the regulating valve according to the water temperature in the water production pipeline.

[0016] Furthermore, a flow meter is connected to the outlet pipe of the water pump. The flow meter is connected to the controller and is used to send the detected outlet flow information of the water pump to the controller. The controller is connected to the water pump and is used to control the operating speed of the water pump according to the outlet flow of the water pump.

[0017] Further, a specific structure of a multi-effect distillation apparatus is provided, the multi-effect distillation apparatus including a steam inlet pipeline, a first steam outlet pipeline, a second steam outlet pipeline, a liquid discharge pipeline, a primary preheater, a primary distillation column, at least two secondary preheaters connected in sequence, and at least two secondary distillation columns connected in sequence.

[0018] The primary preheater and the secondary preheater each have a water inlet, a water outlet, a medium inlet, and a medium outlet.

[0019] The primary distillation column and the secondary distillation column each include an upper evaporator and a lower separator. The upper evaporator has a shell side, a tube side, a liquid inlet, a gas inlet, an upper outlet, and a lower outlet. The gas inlet, the upper outlet, and the lower outlet are respectively connected to the shell side. The liquid inlet is connected to the upper end of the tube side, and the lower end of the tube side is connected to the lower separator. The lower separator is provided with a liquid outlet and a vapor outlet.

[0020] The inlet of the secondary preheater is connected to the outlet of the previous secondary preheater, the outlet of the secondary preheater is connected to the inlet of the next secondary preheater, the inlet of the first secondary preheater is connected to the outlet of the upper heat exchange tube, the outlet of the last secondary preheater is connected to the inlet of the primary preheater, and the outlet of the primary preheater is connected to the liquid inlet of the primary distillation column.

[0021] The inlet of the secondary distillation column is connected to the outlet of the previous secondary distillation column, the outlet of the secondary distillation column is connected to the inlet of the next secondary distillation column, the inlet of the first secondary distillation column is connected to the outlet of the first-stage distillation column, and the outlet of the last secondary distillation column is connected to the drain pipe.

[0022] The steam inlet pipeline is connected to the air inlet of the first-stage distillation column and the medium inlet of the first-stage preheater, respectively. The lower outlet of the first-stage distillation column is connected to the first steam outlet pipeline, and the medium outlet of the first-stage preheater is connected to the second steam outlet pipeline.

[0023] The steam outlet of the secondary distillation column is connected to the inlet of the next secondary distillation column, the inlet of the secondary distillation column is connected to the steam outlet of the previous secondary distillation column, the inlet of the first secondary distillation column is connected to the steam outlet of the first-stage distillation column, and the steam outlet of the last secondary distillation column is connected to the feed inlet on the condenser shell.

[0024] The upper outlet of the secondary distillation column is connected to the inlet of the corresponding secondary preheater, and the outlet of the secondary preheater is connected to the feed inlet on the condenser shell.

[0025] Furthermore, the lower outlet of the secondary distillation column is connected to the feed inlet on the condenser shell.

[0026] Furthermore, the multi-effect distillation apparatus also includes an exhaust pipe, the upper outlet of the first-stage distillation column is connected to the exhaust pipe, and an exhaust valve is connected in the exhaust pipe.

[0027] Furthermore, the multi-effect distillation apparatus also includes a concentrate pipeline, and the lower separator in the first-stage distillation column and the lower separator in the second-stage distillation column are respectively provided with concentrate outlets connected to the concentrate pipeline.

[0028] Furthermore, the inlet of the primary distillation column is connected to a diaphragm valve.

[0029] Using the above technical solution, the buffer tank stores raw water, and the water pump is used to pump the raw water in the buffer tank to the upper heat exchange tube and the lower heat exchange tube. Then, the raw water in the lower heat exchange tube will flow back to the buffer tank, and the raw water in the upper heat exchange tube will flow into the multi-effect distillation device to be heated and evaporated to form steam. The steam formed by evaporation in the multi-effect distillation device will flow into the condenser shell from the feed port on the condenser shell. Then, the steam in the condenser shell will exchange heat with the raw water in the upper heat exchange tube and then with the raw water in the lower heat exchange tube during the downward flow. The raw water in the upper heat exchange tube is preheated after exchanging heat with the steam and then flows into the multi-effect distillation device for further heating and evaporation to form steam. The raw water in the lower heat exchange tube absorbs heat from the steam after exchanging heat with it and then flows back to the buffer tank. The steam in the condenser shell exchanges heat with the raw water, and its temperature decreases, which leads to condensation and liquefaction to form water for injection, which flows into the product water pipeline from the discharge port on the condenser shell. In this system, the feed water in the lower heat exchange tubes flows back to the buffer tank, allowing the flow rate to be set higher to adequately cool the steam. The flow rate in the upper heat exchange tubes is adjusted based on the injection water production volume. Both the upper and lower heat exchange tubes exchange heat with the steam via feed water, transferring heat from the steam to the feed water, significantly improving heat recovery and utilization, preventing heat waste, and saving energy. Furthermore, no additional cooling water or chiller is required, reducing equipment investment and energy consumption. As the feed water in the buffer tank is consumed, it needs to be continuously replenished to maintain a constant temperature. Attached Figure Description

[0030] Figure 1 This is a process flow diagram of the refrigerant-free temperature-controlled multi-effect distilled water machine of this utility model;

[0031] Figure 2 This is a schematic diagram of the structure of the buffer tank, water pump and condenser of this utility model;

[0032] Figure 3 This is a schematic diagram of the structure of the multi-effect distillation apparatus of this utility model;

[0033] Figure 4 This is a schematic diagram of the structure of the primary distillation column and the secondary distillation column of this utility model;

[0034] Figure 5 This is a schematic diagram of the structure of the primary preheater and the secondary preheater of this utility model;

[0035] In the diagram: 1. Buffer tank; 2. Water pump; 3. Condenser; 4. Product water pipeline; 5. Condenser shell; 6. Upper heat exchange tube; 7. Lower heat exchange tube; 8. Check valve; 9. Return pipeline; 10. Regulating valve; 11. Temperature sensor; 12. Flow meter; 13. Steam inlet pipeline; 14. First steam outlet pipeline; 15. Second steam outlet pipeline; 16. Drainage pipeline; 17. Primary preheater; 18. Primary distillation column; 19. Secondary preheater; 20. Secondary distillation column. Tower; 21. Inlet; 22. Outlet; 23. Medium inlet; 24. Medium outlet; 25. Upper evaporator; 26. Lower separator; 27. Liquid inlet; 28. Gas inlet; 29. ​​Upper outlet; 30. Lower outlet; 31. Liquid outlet; 32. Steam outlet; 33. Exhaust pipe; 34. Exhaust valve; 35. Concentrate pipe; 36. Concentrate outlet; 37. Diaphragm valve; 38. Shell; 39. Upper tube sheet; 40. Lower tube sheet; 41. Heat exchanger tubes. Detailed Implementation

[0036] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0037] like Figures 1-3 As shown, a refrigerant-free temperature-controlled multi-effect distillation water machine includes a buffer tank 1, a water pump 2, a condenser 3, a water production pipeline 4, and a multi-effect distillation device;

[0038] The condenser 3 has a condensing shell 5, an upper heat exchange tube 6 and a lower heat exchange tube 7. The upper heat exchange tube 6 and the lower heat exchange tube 7 are both installed in the condensing shell 5. The upper heat exchange tube 6 is located above the lower heat exchange tube 7. The upper end of the condensing shell 5 has a feed inlet and the lower end of the condensing shell 5 has a discharge outlet.

[0039] The inlet of the water pump 2 is connected to the outlet of the buffer tank 1, the outlet of the water pump 2 is connected to the inlet of the upper heat exchange tube 6 and the inlet of the lower heat exchange tube 7 respectively, and the outlet of the lower heat exchange tube 7 is connected to the buffer tank 1.

[0040] The input end of the multi-effect distillation device is connected to the outlet of the upper heat exchange tube 6. The multi-effect distillation device is used to receive the raw water in the upper heat exchange tube 6 and heat and evaporate the raw water to form steam.

[0041] The feed inlet on the condenser shell 5 is connected to the output end of the multi-effect distillation device and is used to receive the steam generated by evaporation in the multi-effect distillation device.

[0042] The water production pipeline 4 is connected to the discharge port on the condenser shell 5.

[0043] Specifically, the buffer tank 1 stores raw water. The water pump 2 pumps the raw water from the buffer tank 1 to the upper heat exchange tube 6 and the lower heat exchange tube 7. The raw water in the lower heat exchange tube 7 then flows back to the buffer tank 1. The raw water in the upper heat exchange tube 6 flows into the multi-effect distillation unit and is heated and evaporated to form steam. The steam evaporated in the multi-effect distillation unit flows into the condenser shell 5 from the feed port. The steam in the condenser shell 5 exchanges heat with the raw water in the upper heat exchange tube 6 and then with the raw water in the lower heat exchange tube 7 as it flows downward. The raw water in the upper heat exchange tube 6 is preheated after exchanging heat with the steam and then flows into the multi-effect distillation unit for further heating and evaporation to form steam. The raw water in the lower heat exchange tube 7 absorbs heat from the steam after exchanging heat with it and then flows back to the buffer tank 1. The steam in the condenser shell 5 exchanges heat with the raw water, and its temperature decreases, causing it to condense and liquefy to form water for injection, which flows into the product water pipeline 4 from the discharge port on the condenser shell 5. Since the raw water in the lower heat exchange tube 7 is returned to the buffer tank 1, the flow rate in the lower heat exchange tube 7 can be set higher as needed to fully meet the cooling requirements of the steam. The flow rate in the upper heat exchange tube 6 can be set according to the production volume of the water for injection. Both the upper heat exchange tube 6 and the lower heat exchange tube 7 exchange heat with the steam through the raw water, thus transferring heat from the steam to the raw water, greatly improving the recovery and utilization rate of heat from the steam, avoiding waste, and saving energy. Furthermore, no additional cooling water or chiller unit is required, saving on equipment investment and reducing energy consumption. Moreover, as the raw water in the buffer tank 1 is continuously consumed, it needs to be continuously replenished to maintain a constant temperature.

[0044] like Figure 1 , 2 As shown, a one-way valve 8 can be connected to the upper heat exchange tube 6.

[0045] like Figure 1 , 2 As shown, the outlet of the lower heat exchange tube 7 can be connected to the buffer tank 1 through the return pipe 9, and the return pipe 9 can be connected to a regulating valve 10 for adjusting the flow rate.

[0046] like Figure 1 , 2 As shown, the refrigerant-free temperature-controlled multi-effect distilled water machine may also include a temperature sensor 11 and a controller;

[0047] The temperature sensor 11 is connected to the water production pipeline 4 and is used to detect the water temperature in the water production pipeline 4;

[0048] The temperature sensor 11 is connected to the controller and sends the measured water temperature information in the water production pipeline 4 to the controller;

[0049] The controller is connected to the regulating valve 10 and controls the opening of the regulating valve 10 according to the water temperature in the product water pipeline 4, so as to regulate the flow rate of the raw water in the return pipeline 9 and the lower heat exchange tube 7. Specifically, when the temperature sensor 11 detects that the water temperature in the product water pipeline 4 is too high, the controller controls the regulating valve 10 to open wider, thereby increasing the flow rate of the raw water in the lower heat exchange tube 7, thus increasing the heat exchange rate between the steam in the condenser shell 5 and the raw water in the lower heat exchange tube 7, and thus lowering the water temperature in the product water pipeline 4. When the temperature sensor 11 detects that the water temperature in the product water pipeline 4 is too low, the controller controls the regulating valve 10 to close wider, thereby decreasing the flow rate of the raw water in the lower heat exchange tube 7, thus decreasing the heat exchange rate between the steam in the condenser shell 5 and the raw water in the lower heat exchange tube 7, and thus raising the water temperature in the product water pipeline 4, thereby meeting the customer's needs for different product water temperatures. In this embodiment, the regulating valve 10 can be a proportional valve.

[0050] like Figure 1 , 2 As shown, a flow meter 12 is connected to the outlet pipe of the water pump 2. The flow meter 12 is connected to the controller and is used to send the detected outlet flow information of the water pump 2 to the controller. The controller is connected to the water pump 2 and is used to control the operating speed of the water pump 2 according to the outlet flow of the water pump 2, thereby ensuring that the outlet flow of the water pump 2 is sufficient.

[0051] like Figures 1-5 As shown, the multi-effect distillation apparatus may include a steam inlet pipe 13, a first steam outlet pipe 14, a second steam outlet pipe 15, a liquid discharge pipe 16, a primary preheater 17, a primary distillation column 18, at least two secondary preheaters 19 connected in sequence, and at least two secondary distillation columns 20 connected in sequence.

[0052] The primary preheater 17 and the secondary preheater 19 each have an inlet 21, an outlet 22, a medium inlet 23, and a medium outlet 24.

[0053] The primary distillation column 18 and the secondary distillation column 20 each include an upper evaporator 25 and a lower separator 26. The upper evaporator 25 has a shell side, a tube side, a liquid inlet 27, an air inlet 28, an upper outlet 29, and a lower outlet 30. The air inlet 28, the upper outlet 29, and the lower outlet 30 are respectively connected to the shell side. The liquid inlet 27 is connected to the upper end of the tube side, and the lower end of the tube side is connected to the lower separator 26. The lower separator 26 is provided with a liquid outlet 31 and a steam outlet 32.

[0054] The inlet 21 of the secondary preheater 19 is connected to the outlet 22 of the previous secondary preheater 19, the outlet 22 of the secondary preheater 19 is connected to the inlet 21 of the next secondary preheater 19, the inlet 21 of the first secondary preheater 19 is connected to the outlet of the upper heat exchange tube 6, the outlet 22 of the last secondary preheater 19 is connected to the inlet 21 of the primary preheater 17, and the outlet 22 of the primary preheater 17 is connected to the liquid inlet 27 of the primary distillation column 18.

[0055] The inlet 27 of the secondary distillation column 20 is connected to the outlet 31 of the previous secondary distillation column 20, the outlet 31 of the secondary distillation column 20 is connected to the inlet 27 of the next secondary distillation column 20, the inlet 27 of the first secondary distillation column 20 is connected to the outlet 31 of the first-stage distillation column 18, and the outlet 31 of the last secondary distillation column 20 is connected to the drain pipe 16.

[0056] The steam inlet pipe 13 is connected to the air inlet 28 of the first-stage distillation column 18 and the medium inlet 23 of the first-stage preheater 17, respectively. The lower outlet 30 of the first-stage distillation column 18 is connected to the first steam outlet pipe 14, and the medium outlet 24 of the first-stage preheater 17 is connected to the second steam outlet pipe 15.

[0057] The steam outlet 32 ​​of the secondary distillation column 20 is connected to the inlet 28 of the next secondary distillation column 20, the inlet 28 of the secondary distillation column 20 is connected to the steam outlet 32 ​​of the previous secondary distillation column 20, the inlet 28 of the first secondary distillation column 20 is connected to the steam outlet 32 ​​of the first-stage distillation column 18, and the steam outlet 32 ​​of the last secondary distillation column 20 is connected to the feed inlet on the condenser shell 5.

[0058] The upper outlet 29 of the secondary distillation column 20 is connected to the inlet 23 of the corresponding secondary preheater 19, and the outlet 24 of the secondary preheater 19 is connected to the feed inlet on the condenser shell 5.

[0059] like Figures 1-5As shown, the lower outlet 30 of the secondary distillation column 20 is connected to the feed inlet on the condenser shell 5; in this embodiment, the secondary distillation column 20 corresponds one-to-one with the secondary preheater 19.

[0060] like Figures 1-5 As shown, the multi-effect distillation apparatus may also include an exhaust pipe 33, the upper outlet 29 of the first-stage distillation column 18 is connected to the exhaust pipe 33, and an exhaust valve 34 is connected in the exhaust pipe 33; specifically, after opening the exhaust valve 34, the non-condensable gas in the shell side of the first-stage distillation column 18 can be discharged from the exhaust pipe 33.

[0061] like Figures 1-5 As shown, the multi-effect distillation apparatus may also include a concentrate pipeline 35, and the lower separator 26 in the first-stage distillation column 18 and the lower separator 26 in the second-stage distillation column 20 are respectively provided with concentrate outlets 36 connected to the concentrate pipeline 35.

[0062] like Figure 3 As shown, the inlet 27 of the primary distillation column 18 can be connected to a diaphragm valve 37; specifically, by controlling the opening degree of the diaphragm valve 37, the flow rate of the raw water entering the primary distillation column 18 can be controlled, thereby indirectly controlling the flow rate of the raw water in the upper heat exchange tube 6.

[0063] Specifically, the working principle of the multi-effect distillation device is as follows: First, the raw water in the upper heat exchange tube 6 flows into the first secondary preheater 19 from the inlet 21 of the first secondary preheater 19, then flows out from the outlet 22 of the first secondary preheater 19 and flows into the second secondary preheater 19 from the inlet 21 of the second secondary preheater 19. Then, the raw water flows out from the outlet 22 of the second secondary preheater 19 and flows into the third secondary preheater 19 from the inlet 21 of the third secondary preheater 19, until the raw water flows through each of the secondary preheaters 19 in sequence, then flows out from the outlet 22 of the last secondary preheater 19 and flows into the first preheater 17 from the inlet 21 of the first primary preheater 17. Then, the raw water flows out from the outlet 22 of the first primary preheater 17 and flows into the first primary distillation column 18 from the inlet 27 of the first primary distillation column 18. Meanwhile, the external industrial steam connected to the steam inlet pipe 13 is divided into two paths. One path flows into the shell side of the primary distillation column 18 from the air inlet 28, and the other path flows into the primary preheater 17 from the medium inlet 23. The industrial steam flowing into the shell side of the primary distillation column 18 then flows into the first steam outlet pipe 14 from the lower outlet 30 of the primary distillation column 18 and is discharged. The station steam flowing into the primary preheater 17 flows into the second steam outlet pipe 15 from the medium outlet 24 of the primary preheater 17 and is discharged.

[0064] In the primary distillation column 18, the feed water flowing in from the inlet 27 enters the tube side of the primary distillation column 18 and flows downward. The feed water in the tube side exchanges heat with the industrial steam in the shell side of the primary distillation column 18. Then, the feed water in the tube side is heated and partially evaporates into clean steam. The clean steam and the unevaporated feed water in the tube side flow downward along the tube side into the lower separator 26 of the primary distillation column 18. The clean steam and the unevaporated feed water are separated into gas and liquid in the lower separator 26. The separated unevaporated feed water flows out from the outlet 31 of the primary distillation column 18 and flows into the inlet 27 of the first secondary distillation column 20. The separated clean steam flows out from the steam outlet 32 ​​of the primary distillation column 18 and flows into the gas inlet 28 of the first secondary distillation column 20.

[0065] In the first secondary distillation column 20, the feed water flowing in from the inlet 27 enters the tube side of the secondary distillation column 20 and flows downwards. The clean steam flowing in from the inlet 28 enters the shell side of the secondary distillation column 20. The feed water in the tube side of the secondary distillation column 20 exchanges heat with the clean steam in the shell side. Then, the feed water in the tube side is heated and partially evaporated into clean steam again. The clean steam obtained from the second evaporation in the tube side and the unevaporated feed water flow downwards along the tube side into the lower separator 26 of the secondary distillation column 20. The lower separator 26 separates the incoming clean steam and the unevaporated feed water into a gas-liquid mixture. The separated unevaporated feed water flows out from the outlet 31 of the secondary distillation column 20 and into the inlet 27 of the next secondary distillation column 20. The clean steam separated in the lower separator 26 flows out from the steam outlet 32 ​​of the secondary distillation column 20 and into the inlet 28 of the next secondary distillation column 20. The clean steam flowing into the shell side of the secondary distillation column 20 from the inlet 28 is partially liquefied due to the temperature reduction after heat exchange. The liquefied water from the clean steam in the shell side of the secondary distillation column 20 flows from the lower outlet 30 of the secondary distillation column 20 into the feed inlet on the condenser shell 5. The unliquefied clean steam in the shell side of the secondary distillation column 20 is discharged from the upper outlet 29 of the secondary distillation column 20 into the inlet 23 of the corresponding secondary preheater 19. The working principle of the second secondary distillation column 20 and each subsequent secondary distillation column 20 is the same as that of the first secondary distillation column 20. The clean steam flowing out from the steam outlet 32 ​​of the last secondary distillation column 20 flows directly into the feed inlet on the condenser shell 5, and the unevaporated raw material water flowing out from the liquid outlet 31 of the last secondary distillation column 20 flows into the drain pipe 16 for discharge.

[0066] In each secondary preheater 19, the raw water flows into the secondary preheater 19 from the inlet 21. The clean steam discharged from the upper outlet 29 of the corresponding secondary distillation column 20 flows into the secondary preheater 19 from the inlet 23. In the secondary preheater 19, the heat of the clean steam is transferred to the raw water, thus preheating the raw water. Then, the clean steam flows from the outlet 24 of the secondary preheater 19 into the feed inlet on the condenser shell 5. The preheated raw water flows from the outlet 22 of the secondary preheater 19 into the inlet 21 of the next secondary preheater 19. The raw water in the last secondary preheater 19 flows from the outlet 22 of the secondary preheater 19 into the inlet 21 of the primary preheater 17.

[0067] In the primary preheater 17, raw water flows into the primary preheater 17 from the inlet 21, and industrial steam flows into the primary preheater 17 from the inlet 23. In the primary preheater 17, the heat of the industrial steam is transferred to the raw water, which can further preheat the raw water. Then, the station steam flows from the outlet 24 of the primary preheater 17 into the second steam outlet pipeline 15 and is discharged. The preheated raw water flows from the outlet 22 of the primary preheater 17 into the inlet 27 of the primary distillation column 18.

[0068] More specifically, the upper separator includes a shell 38, an upper tube sheet 39, a lower tube sheet 40, and heat exchange tubes 41. The upper tube sheet 39 and the lower tube sheet 40 are both installed within the shell 38. The heat exchange tubes 41 are located inside the shell 38, with their upper ends connected to the upper tube sheet 39 and their lower ends connected to the lower tube sheet 40. The tube side is located inside the heat exchange tubes 41, and the shell side is located between the heat exchange tubes 41 and the shell 38. More specifically, the specific structures of the primary distillation column 18 and the secondary distillation column 20 are existing technologies well-known to those skilled in the art. For example, both the primary distillation column 18 and the secondary distillation column 20 can, but are not limited to, adopt the distillation column of a novel multi-effect water distiller disclosed in Chinese Patent No. CN223087627U.

[0069] In summary, the buffer tank 1 stores raw water, and the water pump 2 is used to pump the raw water in the buffer tank 1 to the upper heat exchange tube 6 and the lower heat exchange tube 7. Then, the raw water in the lower heat exchange tube 7 flows back to the buffer tank 1, and the raw water in the upper heat exchange tube 6 flows into the multi-effect distillation device to be heated and evaporated to form steam. The steam formed by evaporation in the multi-effect distillation device flows into the condenser shell 5 from the feed port on the condenser shell 5. Then, the steam in the condenser shell 5 exchanges heat with the raw water in the upper heat exchange tube 6 and then with the raw water in the lower heat exchange tube 7 during its downward flow. After exchanging heat with the steam, the raw water in the upper heat exchange tube 6 is preheated and then flows into the multi-effect distillation device for further heating and evaporation to form steam. After exchanging heat with the steam, the raw water in the lower heat exchange tube 7 absorbs the heat from the steam and flows back to the buffer tank 1. After exchanging heat with the raw water, the steam in the condenser shell 5 cools down and then condenses and liquefies to form water for injection, which flows into the product water pipeline 4 from the discharge port on the condenser shell 5. Since the raw water in the lower heat exchange tube 7 is returned to the buffer tank 1, the flow rate in the lower heat exchange tube 7 can be set higher as needed to fully meet the cooling requirements of the steam. The flow rate in the upper heat exchange tube 6 can be set according to the production volume of the water for injection. Both the upper heat exchange tube 6 and the lower heat exchange tube 7 exchange heat with the steam through the raw water, thus transferring heat from the steam to the raw water, greatly improving the recovery and utilization rate of heat from the steam, avoiding waste, and saving energy. Furthermore, no additional cooling water or chiller unit is required, saving on equipment investment and reducing energy consumption. Moreover, as the raw water in the buffer tank 1 is continuously consumed, it needs to be continuously replenished to maintain a constant temperature.

[0070] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A refrigerant-free temperature-controlled multi-effect distilled water machine, characterized in that, It includes a buffer tank (1), a water pump (2), a condenser (3), a water production pipeline (4), and a multi-effect distillation unit; The condenser (3) has a condensing shell (5), an upper heat exchange tube (6) and a lower heat exchange tube (7). The upper heat exchange tube (6) and the lower heat exchange tube (7) are both installed in the condensing shell (5). The upper heat exchange tube (6) is located above the lower heat exchange tube (7). The upper end of the condensing shell (5) has a feed inlet and the lower end of the condensing shell (5) has a discharge outlet. The inlet of the water pump (2) is connected to the outlet of the buffer tank (1), the outlet of the water pump (2) is connected to the inlet of the upper heat exchange tube (6) and the inlet of the lower heat exchange tube (7), and the outlet of the lower heat exchange tube (7) is connected to the buffer tank (1). The input end of the multi-effect distillation device is connected to the outlet of the upper heat exchange tube (6). The multi-effect distillation device is used to receive the raw water in the upper heat exchange tube (6) and heat and evaporate the raw water to form steam. The feed inlet on the condenser shell (5) is connected to the output end of the multi-effect distillation device and is used to receive the steam generated by evaporation in the multi-effect distillation device; The water production pipeline (4) is connected to the discharge port on the condenser shell (5).

2. The refrigerant-free temperature-controlled multi-effect distilled water machine according to claim 1, characterized in that, A one-way valve (8) is connected to the upper heat exchange tube (6).

3. The refrigerant-free temperature-controlled multi-effect distillation water machine according to claim 1, characterized in that, The outlet of the lower heat exchange tube (7) is connected to the buffer tank (1) through the return pipe (9), and the return pipe (9) is connected to a regulating valve (10) for adjusting the flow rate.

4. The refrigerant-free temperature-controlled multi-effect distillation water machine according to claim 3, characterized in that, It also includes a temperature sensor (11) and a controller; The temperature sensor (11) is connected in the water production pipeline (4) and is used to detect the water temperature in the water production pipeline (4); The temperature sensor (11) is connected to the controller and sends the measured water temperature information in the water production pipeline (4) to the controller; The controller is connected to the regulating valve (10) and is used to control the opening degree of the regulating valve (10) according to the water temperature in the water production pipeline (4).

5. The refrigerant-free temperature-controlled multi-effect distillation water machine according to claim 4, characterized in that, A flow meter (12) is connected to the outlet pipe of the water pump (2). The flow meter (12) is connected to the controller and is used to send the detected outlet flow information of the water pump (2) to the controller. The controller is connected to the water pump (2) and is used to control the operating speed of the water pump (2) according to the outlet flow of the water pump (2).

6. The refrigerant-free temperature-controlled multi-effect distillation water machine according to claim 1, characterized in that, The multi-effect distillation apparatus includes a steam inlet pipe (13), a first steam outlet pipe (14), a second steam outlet pipe (15), a liquid discharge pipe (16), a primary preheater (17), a primary distillation column (18), at least two secondary preheaters (19) connected in sequence, and at least two secondary distillation columns (20) connected in sequence. The primary preheater (17) and the secondary preheater (19) each have an inlet (21), an outlet (22), a medium inlet (23), and a medium outlet (24). The primary distillation column (18) and the secondary distillation column (20) each include an upper evaporator (25) and a lower separator (26). The upper evaporator (25) has a shell side, a tube side, a liquid inlet (27), an air inlet (28), an upper outlet (29), and a lower outlet (30). The air inlet (28), the upper outlet (29), and the lower outlet (30) are respectively connected to the shell side. The liquid inlet (27) is connected to the upper end of the tube side, and the lower end of the tube side is connected to the lower separator (26). The lower separator (26) is provided with a liquid outlet (31) and a steam outlet (32). The inlet (21) of the secondary preheater (19) is connected to the outlet (22) of the previous secondary preheater (19), the outlet (22) of the secondary preheater (19) is connected to the inlet (21) of the next secondary preheater (19), the inlet (21) of the first secondary preheater (19) is connected to the outlet of the upper heat exchange tube (6), the outlet (22) of the last secondary preheater (19) is connected to the inlet (21) of the primary preheater (17), and the outlet (22) of the primary preheater (17) is connected to the liquid inlet (27) of the primary distillation column (18). The inlet (27) of the secondary distillation column (20) is connected to the outlet (31) of the previous secondary distillation column (20), the outlet (31) of the secondary distillation column (20) is connected to the inlet (27) of the next secondary distillation column (20), the inlet (27) of the first secondary distillation column (20) is connected to the outlet (31) of the first distillation column (18), and the outlet (31) of the last secondary distillation column (20) is connected to the drain pipe (16). The steam inlet pipe (13) is connected to the air inlet (28) of the first-stage distillation column (18) and the medium inlet (23) of the first-stage preheater (17), respectively. The lower outlet (30) of the first-stage distillation column (18) is connected to the first steam outlet pipe (14), and the medium outlet (24) of the first-stage preheater (17) is connected to the second steam outlet pipe (15). The steam outlet (32) of the secondary distillation column (20) is connected to the inlet (28) of the next secondary distillation column (20), the inlet (28) of the secondary distillation column (20) is connected to the steam outlet (32) of the previous secondary distillation column (20), the inlet (28) of the first secondary distillation column (20) is connected to the steam outlet (32) of the first distillation column (18), and the steam outlet (32) of the last secondary distillation column (20) is connected to the feed inlet on the condenser shell (5). The upper outlet (29) of the secondary distillation column (20) is connected to the inlet (23) of the corresponding secondary preheater (19), and the outlet (24) of the secondary preheater (19) is connected to the feed inlet on the condenser shell (5).

7. The refrigerant-free temperature-controlled multi-effect distillation water machine according to claim 6, characterized in that, The lower outlet (30) of the secondary distillation column (20) is connected to the feed inlet on the condenser shell (5).

8. The refrigerant-free temperature-controlled multi-effect distillation water machine according to claim 6, characterized in that, The multi-effect distillation apparatus also includes an exhaust pipe (33), the upper outlet (29) of the first-stage distillation column (18) is connected to the exhaust pipe (33), and an exhaust valve (34) is connected in the exhaust pipe (33).

9. The refrigerant-free temperature-controlled multi-effect distillation water machine according to claim 6, characterized in that, The multi-effect distillation apparatus also includes a concentrate pipeline (35), and the lower separator (26) in the first-stage distillation column (18) and the lower separator (26) in the second-stage distillation column (20) are respectively provided with concentrate outlets (36) connected to the concentrate pipeline (35).

10. The refrigerant-free temperature-controlled multi-effect distillation water machine according to claim 6, characterized in that, The inlet (27) of the primary distillation column (18) is connected to a diaphragm valve (37).

Images