A kind of equipment for preparing distilled water by climbing membrane evaporation and its preparation method

Abstract

The application discloses a kind of equipment and preparation method for preparing distilled water of climbing film evaporation, including condensing system, preheater and evaporator;Six The evaporator is sequentially spaced, and preheater is provided between adjacent evaporator, and spiral gas-liquid separation device and multi-lead labyrinth device are provided on the upper half of evaporator up and down interval;The steam outlet of first-effect evaporator is communicated with the steam inlet of next-effect evaporator through preheater, and so on, and the steam outlet of last-effect evaporator is communicated with condensing system;The liquid phase outlet of second-effect evaporator is communicated with next-effect evaporator by distilled water collecting pipeline, and so on, and the liquid phase outlet of last-effect evaporator is communicated with condensing system;After raw water inlet main pipeline is communicated with condensing system, five preheaters are sequentially connected in series by raw water preheating pipeline, and then sequentially connected with corresponding evaporator;Industrial steam pipeline is communicated with the steam inlet of first-effect evaporator.The application improves the superheat degree and dry value of pure steam.

Description

Technical Field

[0001] This invention relates to the field of distilled water preparation technology, specifically to a rising film evaporation distilled water preparation device and its preparation method. Background Technology

[0002] With the development of science and technology and the improvement of people's living standards, pharmaceutical factories, hospitals, and research institutions are gradually raising their requirements for the quality of distilled water they use. Promoting the green transformation of traditional manufacturing industries, encouraging enterprises to upgrade their processes and equipment, and improving energy efficiency have become the themes of our time, and are of great significance for advancing my country's energy conservation and environmental protection industry.

[0003] Currently, most multi-effect water distillation machines in China adopt two types of separation: falling film spiral separation and falling film wire mesh separation. Falling film spiral separation, due to its small separation cylinder space, is affected by many factors, resulting in less than ideal separation performance. Falling film wire mesh separation has several drawbacks, such as: 1) when the mist content in the gas is high, the wire mesh demister can become saturated, easily causing droplet entrainment and reducing separation efficiency; 2) when the water machine is not in use, the wire mesh demister is in a warm and humid environment for a long time, making it prone to secondary contamination; 3) due to the structure of the wire mesh separation system, the growth of microorganisms increases steam resistance, heat loss, and water quality instability.

[0004] While some methods currently employ rising film evaporators to prepare distilled water, such as Chinese patent application number 201911111034.7, which discloses "an integral rising film evaporator with a spiral separation device," this evaporator only uses a spiral pure steam separator to separate the steam. The separation of pure steam and water is incomplete, thus affecting the effectiveness of the pure steam. Furthermore, the superheat and drying value of the steam are unstable. Therefore, these problems urgently need to be addressed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a distillation water preparation device and preparation method by rising film evaporation. By using a multi-lead labyrinth device and a spiral gas-liquid separator in combination, microbubbles and free gases are effectively removed, and small water droplets in pure steam are removed, thereby greatly improving the superheat and drying value of pure steam and reducing the content of non-condensable gases.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The innovative feature of the rising film evaporation distillation water preparation device of the present invention is that it includes a condensation system, a preheater, and an evaporator; six evaporators are arranged vertically side-by-side from left to right, with preheaters vertically spaced between adjacent evaporators; heat exchange tubes for evaporation are arranged in a multi-lead manner in the lower half of each evaporator, and a spiral gas-liquid separator and a multi-lead labyrinth device for separation are respectively arranged vertically and vertically in the upper half; a raw water inlet and a steam inlet are arranged vertically and vertically at the middle left side position of each evaporator, a raw water outlet is located at the middle right side position, a liquid phase outlet is located at the bottom right side position, and a steam outlet is located at the top; the steam outlet of the first-effect evaporator is connected to the steam inlet of the next-effect evaporator via a pure steam pipeline through the heat medium channel of the corresponding preheater, and so on until the last effect evaporator. The first-effect evaporator has a steam outlet connected to the heat medium channel of the condensing system via a pure steam pipeline; the liquid outlet of the second-effect evaporator is connected to the next-effect evaporator via a distilled water collection pipeline, and so on until the last-effect evaporator, whose liquid outlet is connected to the heat medium channel of the condensing system via a distilled water collection pipeline; the raw water inlet main pipeline is connected to the refrigerant channel of the condensing system for a first heat exchange, and then the refrigerant channels of the five preheaters are connected in series from right to left via the raw water preheating pipeline for a second heat exchange, and then connected in series with the corresponding evaporators from left to right via the raw water inlet and raw water outlet for a third heat exchange; the industrial steam pipeline is connected to the steam inlet of the first-effect evaporator, and after the raw water is heated and evaporated by industrial steam, it undergoes gas-liquid separation through the cooperation of a multi-lead labyrinth device and a spiral gas-liquid separator, and then is cooled into distilled water through heat exchange in the condensing system;

[0007] It also includes a concentrated water discharge pipe, an evaporator bottom discharge pipe, an evaporator bottom discharge valve, a total evaporator bottom discharge pipe, and a concentrated water total collection and discharge pipe; the bottom of each effect evaporator is connected to one end of the corresponding evaporator bottom discharge pipe, and the other end of each evaporator bottom discharge pipe is connected to the total evaporator bottom discharge pipe, and each evaporator bottom discharge pipe is also provided with an evaporator bottom discharge valve for controlling its on / off state; the raw water outlet of the last effect evaporator is connected to the total evaporator bottom discharge pipe through a raw water preheating pipe; the upper end of each concentrated water discharge pipe extends above the multi-lead labyrinth device to the interior of the corresponding evaporator, and is connected to the bottom of the corresponding spiral gas-liquid separator, and the lower end of each concentrated water discharge pipe is connected to the total concentrated water collection and discharge pipe, and is also provided with a seventh valve for controlling its on / off state, thereby independently discharging the concentrated water generated by each effect separation through the concentrated water discharge pipe;

[0008] Each of the multi-lead labyrinth devices includes a lower baffle, a middle baffle, an upper baffle, a support column, and a support plate. In the upper half of the interior of each evaporator, corresponding positions are provided with an upper baffle, a middle baffle, and a lower baffle arranged horizontally from top to bottom at intervals. Each upper and lower baffle is a hollow conical structure matching the interior of the corresponding evaporator. The lower surface of each upper and lower baffle is a large-diameter end, and the outer diameter of its large-diameter end is smaller than the inner diameter of the corresponding evaporator, thus forming a steam flow channel with the inner wall of the corresponding evaporator. Several support plates are evenly distributed vertically at intervals along the circumference of the lower surface of each lower baffle, and each lower baffle is fixedly connected to the inner wall of the corresponding evaporator through the support plates, ensuring that the support plates do not interfere with the steam flow. A vertically fixed support column is also coaxially fixed between each upper baffle and the corresponding lower baffle. The system includes support columns that support and fix the corresponding upper baffles. Each intermediate baffle is an inverted funnel-shaped structure that matches the interior of the corresponding evaporator, with its upper end being the large-diameter end, which is sealed and fixed to the inner wall of the corresponding evaporator. The inner diameter of the small-diameter end of each intermediate baffle is larger than the outer diameter of the corresponding support column, and they are coaxially spaced and fitted onto the corresponding support column, forming a steam flow channel between them. An S-shaped flow channel is formed through the gaps between the lower baffle and the inner wall of the evaporator, the gaps between the intermediate baffle and the support column, and the gaps between the upper baffle and the inner wall of the evaporator, resulting in three collisions and separations of the steam. Several support blocks are also sequentially spaced along the circumferential direction at the bottom of the outer circumference of each support column. Each support block is integrally formed with the corresponding support column, thereby supporting and fixing the corresponding intermediate baffle.

[0009] Preferably, the system further includes a raw water buffer tank, a raw water buffer tank drain pipe, a first raw water inlet control valve, a raw water pump, a second raw water inlet control valve, and a raw water flow meter. A raw water buffer tank is also provided on the main raw water inlet pipe, and a raw water buffer tank drain pipe is connected to the bottom of the raw water buffer tank. A first valve for controlling the on / off state is also provided on the raw water buffer tank drain pipe, thereby ensuring a constant flow of water intake through the raw water buffer tank. A first raw water inlet control valve is also provided on the main raw water inlet pipe relative to the raw water inlet side of the raw water buffer tank, and a raw water pump, a second raw water inlet control valve, and a raw water flow meter are sequentially spaced on it relative to the raw water outlet side of the raw water buffer tank. The raw water is then pumped into the refrigerant channel of the condensing system for heat exchange via the raw water pump.

[0010] Preferably, the condensation system includes an upper condenser, a lower condenser, a condenser non-condensable gas discharge pipeline, a qualified distilled water outlet pipeline, a non-qualified water outlet pipeline, a cooling water inlet pipeline, a cooling water return pipeline, a distilled water conductivity sensor, and a distilled water outlet temperature sensor; the raw water inlet pipeline is connected to the refrigerant inlet of the upper condenser, and the refrigerant outlet of the upper condenser is connected to the refrigerant channel of the final effect preheater through a raw water preheating pipeline, thereby allowing the raw water, after being heated by the first heat exchange, to flow sequentially through the refrigerant channels of each effect preheater for a second heat exchange; the steam outlet of the final effect evaporator is connected to the heat medium inlet of the upper condenser through a pure steam pipeline, and the liquid phase outlet of the final effect evaporator is connected to the heat medium inlet of the upper condenser through a distilled water collection pipeline, thereby allowing the steam and the condensed distilled water to exchange heat with the raw water through the heat medium channel of the upper condenser for cooling; the upper condenser is connected to the condenser non-condensable gas discharge pipeline, and a second valve for controlling its on / off state is also provided on the condenser non-condensable gas discharge pipeline, thereby allowing the cooling water to flow sequentially through the refrigerant channels of each effect preheater for a second heat exchange; Non-condensable gas is discharged from the non-condensable gas discharge pipe of the condenser; the refrigerant inlet of the lower condenser is connected to the cooling water inlet pipe, and the refrigerant outlet of the lower condenser is connected to the cooling water return pipe; the heat medium outlet of the upper condenser is connected to the heat medium inlet of the lower condenser, and the distilled water cooled by the upper condenser enters the heat medium channel of the lower condenser to exchange heat with the cooling water, thereby undergoing secondary cooling; the heat medium outlet of the lower condenser is connected to the qualified distilled water outlet pipe and the unqualified water outlet pipe respectively, and a distilled water conductivity sensor and a distilled water outlet temperature sensor are sequentially and spaced apart on them; a third valve for controlling its on / off state is provided on the qualified distilled water outlet pipe, and a fourth valve for controlling its on / off state is provided on the unqualified water outlet pipe; the third valve and the fourth valve are electrically connected to the distilled water conductivity sensor and the distilled water outlet temperature sensor respectively, and thus, through the cooperation of the distilled water conductivity sensor and the distilled water outlet temperature sensor, the qualification of the distilled water after secondary cooling by the lower condenser is determined.

[0011] Preferably, both the upper and lower condensers are arranged at an angle to ensure zero dead zone discharge of distilled water; the upper condenser, the lower condenser, and each of the preheaters form refrigerant and heat transfer channels through internal heat exchange tubes, and the built-in heat exchange tubes are arranged in a multi-lead manner to ensure that the refrigerant and heat transfer channels can perform sufficient heat exchange.

[0012] Preferably, it further includes a non-condensable gas collection device and a non-condensable gas discharge pipeline; a non-condensable gas collection device is also connected between the refrigerant outlet of the first-effect preheater and the raw water inlet of the first-effect evaporator on the raw water preheating pipeline. The non-condensable gas collection device adopts a fully insulated structure and is connected to the non-condensable gas discharge pipeline. A fifth valve for controlling its on / off state is also provided on the non-condensable gas discharge pipeline, so that the non-condensable gas is discharged through the non-condensable gas collection device, thereby reducing the non-condensable gas content.

[0013] Preferably, it also includes an industrial steam condensate pipeline, a hot water disinfection pipeline, and a hot water disinfection control valve; each of the preheaters and evaporators adopts a fully insulated structure, and a secondary steam temperature sensor is respectively installed on the pure steam pipeline between the steam outlet of each evaporator and the heat medium inlet of the corresponding preheater; the liquid phase outlet of the first-effect evaporator is connected to the industrial steam condensate pipeline, and a sixth valve for controlling its on / off state is also provided on the industrial steam condensate pipeline, thereby discharging the generated condensate through the industrial steam condensate pipeline; the bottom of the first-effect evaporator is connected to one end of the hot water disinfection pipeline, and the other end of the hot water disinfection pipeline is connected to the first raw material water inlet control valve, and a hot water disinfection control valve for controlling its on / off state is also provided on the first raw material water inlet control valve, thereby disinfecting the raw material water through the hot water disinfection pipeline.

[0014] Preferably, each of the spiral gas-liquid separation devices includes a separation cylinder, an inner cylinder, gas-liquid separation holes, a spiral plate, and a fixed liquid-throwing plate; a separation cylinder is vertically and coaxially sleeved at corresponding positions in the upper half of the interior of each evaporator, and an inner cylinder is vertically and coaxially sleeved inside each separation cylinder, and a spiral plate spiraling upwards is coaxially sleeved inside each inner cylinder along its axial direction; each separation cylinder and its corresponding inner cylinder form a gap for condensate flow, and several gas-liquid separation holes are evenly distributed and spaced along the circumferential direction on the outer circumferential surface of the lower half of each inner cylinder, each gas-liquid separation hole is arranged without interfering with the corresponding rotating plate, and the gap between each inner cylinder and its corresponding separation cylinder is... The gas-liquid separation hole is connected to the interior of the corresponding inner cylinder; several fixed liquid-throwing plates are arranged at intervals along the circumferential direction at the top of the outer circumferential surface of each separation cylinder, and the angle between each fixed liquid-throwing plate and the horizontal plane is 30°. The upper end of each inner cylinder is fixedly connected to the upper end of the corresponding separation cylinder through the fixed liquid-throwing plate. The pure steam separated by the multi-lead labyrinth device is then introduced into the spiral plate of the corresponding inner cylinder for further separation through the fixed liquid-throwing plate. The upper end of each concentrated water discharge pipe extends from above the multi-lead labyrinth device to the interior of the corresponding evaporator and is connected to the bottom of the corresponding separation cylinder. It is then connected to the gap between the inner cylinder and the corresponding separation cylinder to discharge the separated condensate separately.

[0015] The present invention discloses a method for preparing distilled water using a rising film evaporation distillation water preparation device, the innovation of which lies in including the following steps:

[0016] (1) After the raw water is pumped into the refrigerant channel of the upper condenser by the raw water pump for heat exchange and heating, it flows through the refrigerant channel of each effect preheater through the raw water preheating pipeline for secondary heat exchange and heating, and then enters the first effect evaporator through the raw water inlet.

[0017] (2) Industrial steam is introduced into the steam inlet of the first-effect evaporator. The industrial steam heats the preheated raw water. After the heat is absorbed, condensate is formed and discharged through the industrial steam condensate pipeline.

[0018] (3) The raw water is heated and evaporated by industrial steam to generate secondary steam. The steam moves upward and collides and separates with the lower baffle, the middle baffle and the upper baffle in sequence, separating some small water droplets.

[0019] (4) The separated steam continues to move upward through the S-shaped flow channel of the multi-lead labyrinth device, flows through the fixed liquid-throwing plate and then enters the spiral plate of the corresponding inner cylinder, and undergoes secondary gas-liquid separation through the spiral plate. The separated condensate flows into the gap between the separation cylinder and the inner cylinder through the gas-liquid separation hole, and is then discharged separately through the concentrated water discharge pipe.

[0020] (5) After secondary separation, the steam enters the heat medium channel of the first effect preheater through the steam outlet, and exchanges heat with the raw water in the cold medium channel of the first effect preheater. Then, it enters the second effect evaporator through the steam inlet, absorbs heat and condenses into distilled water. The subsequent effects are similar. The distilled water condensed from the secondary steam of the second effect and subsequent effects enters the heat medium channel of the upper condenser through the distilled water collection pipeline. In addition, the secondary steam of the last effect evaporator enters the heat medium channel of the upper condenser through the corresponding pure steam pipeline and exchanges heat with the raw water in the cold medium channel of the upper condenser for cooling.

[0021] (6) Cooling water flows through the refrigerant channel of the lower condenser. Then, after being cooled once, the distilled water exits from the heat medium outlet of the upper condenser and enters the heat medium channel of the lower condenser to exchange heat with the cooling water in the refrigerant channel of the lower condenser.

[0022] (7) After secondary cooling, the distilled water exits from the heat medium outlet of the lower condenser. Qualified distilled water is collected through the qualified distilled water outlet pipe, and unqualified distilled water is collected through the unqualified water outlet pipe.

[0023] (8) The raw water that has not been evaporated in the first effect evaporator enters the second effect evaporator through the raw water inlet. The same applies to each subsequent effect until the last effect evaporator. If the raw water has not been evaporated, it is discharged through the main drain pipe of the evaporator.

[0024] The beneficial effects of this invention are:

[0025] (1) The present invention effectively removes microbubbles and free gas by using a combination of a multi-lead labyrinth device and a spiral gas-liquid separator, removes small water droplets from pure steam, thereby greatly improving the superheat and drying value of pure steam and reducing the content of non-condensable gases.

[0026] (2) By setting up a multi-lead labyrinth device, the present invention performs three-stage impact separation of pure steam, thereby improving the steam-water separation effect and increasing the superheat and drying value of pure steam.

[0027] (3) The evaporator and preheater of the present invention both adopt a fully insulated structure, which improves the thermal energy utilization rate of the whole system, with low steam consumption and high raw water utilization rate.

[0028] (4) The heat exchange tubes built into the preheater, upper condenser and lower condenser of the present invention are all arranged in a multi-lead manner, so as to ensure that the heat exchange between different media can be fully carried out, meet the full utilization of energy, and meet the requirement of heating the raw water to the temperature at which non-condensable gases can be discharged;

[0029] (5) The upper and lower condensers of this invention are both arranged in an inclined manner to ensure zero dead angle discharge of distilled water. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the structure of a rising film evaporation distillation water preparation device according to the present invention.

[0031] Figure 2 This is a schematic diagram of the internal structure of the evaporation chamber in the evaporator of the present invention.

[0032] Figure 3 for Figure 2 A schematic diagram of the structure of a multi-lead labyrinth device.

[0033] Figure 4 This is a schematic diagram showing the flow direction of steam in the multi-lead labyrinth device of the present invention.

[0034] Figure 5 for Figure 2 Schematic diagram of the gas-liquid separation hole in the inner cylinder.

[0035] Figure 6 This is a schematic diagram showing the flow direction of pure steam in the spiral gas-liquid separator of the present invention.

[0036] Among them, 1-raw water inlet main pipeline; 2-first raw water inlet control valve; 3-raw water buffer tank; 4-raw water pump; 5-second raw water inlet control valve; 6-raw water flow meter; 7-upper condenser; 8-lower condenser; 9-condenser non-condensable gas discharge pipeline; 10-raw water preheating pipeline; 11-preheater; 12-non-condensable gas collection device; 13-non-condensable gas discharge pipeline; 14-evaporator; 15-concentrated water discharge pipeline; 16-evaporator main lower discharge pipeline; 17-industrial steam pipeline; 18-multi-lead labyrinth device; 19-spiral gas-liquid separator; 20-pure steam pipeline; 21-secondary steam temperature sensor; 22-distilled water collection pipeline; 23-industrial... 24-Hot water disinfection pipeline; 25-Raw water buffer tank drain pipeline; 26-Evaporator lower drain pipeline; 27-Evaporator lower drain valve; 28-Concentrated water main collection and discharge pipeline; 29-Cooling water inlet pipeline; 30-Cooling water return pipeline; 31-Qualified distilled water outlet pipeline; 32-Unqualified water outlet pipeline; 33-Distilled water conductivity sensor; 34-Distilled water outlet temperature sensor; 35-Hot water disinfection control valve; 181-Lower baffle; 182-Intermediate baffle; 183-Upper baffle; 184-Support column; 185-Support plate; 191-Separation cylinder; 192-Inner cylinder; 193-Gas-liquid separation hole; 194-Spiral plate; 195-Fixed liquid ejector plate. Detailed Implementation

[0037] The technical solution of the present invention will be clearly and completely described below through specific embodiments.

[0038] The present invention provides a rising film evaporation distillation water preparation device, comprising a condensation system, a preheater 11, and an evaporator 14; the specific structure is as follows: Figures 1-6As shown, six evaporators 14 are arranged vertically side by side from left to right, with preheaters 11 vertically spaced between adjacent evaporators 14. Each evaporator 14 has heat exchange tubes for evaporation arranged in a multi-lead configuration in its lower half, and a spiral gas-liquid separator 19 and a multi-lead labyrinth device 18 for separation, spaced vertically on its upper half. Each evaporator 14 has a raw water inlet and a steam inlet spaced vertically on its left side (middle position), a raw water outlet on its right side (middle position), a liquid outlet at its right bottom, and a [missing information - likely a continuation of the previous sentence]. Steam outlet; the steam outlet of the first-effect evaporator 14 is connected to the steam inlet of the next-effect evaporator 14 via the pure steam pipeline 20 and the heat medium channel of the corresponding preheater 11, and so on until the last-effect evaporator 14, and the steam outlet of the last-effect evaporator 14 is connected to the heat medium channel of the condensing system via the pure steam pipeline 20; the liquid outlet of the second-effect evaporator 14 is connected to the next-effect evaporator 14 via the distilled water collection pipeline 22, and so on until the last-effect evaporator 14, and the liquid outlet of the last-effect evaporator 14 is connected to the heat medium channel of the condensing system via the distilled water collection pipeline 22.

[0039] like Figure 1 As shown, after the raw water inlet main pipeline 1 is connected to the refrigerant channel of the condensing system for a first heat exchange, the refrigerant channels of the five preheaters 11 are connected in series from right to left through the raw water preheating pipeline 10 for a second heat exchange. Then, from left to right, the raw water inlet and raw water outlet are connected in series with the corresponding evaporators 14 for a third heat exchange. The industrial steam pipeline 17 is connected to the steam inlet of the first-effect evaporator 14. After the raw water is heated and evaporated by industrial steam, it undergoes gas-liquid separation through the cooperation of the multi-lead labyrinth device 18 and the spiral gas-liquid separator 19, and is then cooled into distilled water through heat exchange in the condensing system.

[0040] like Figure 1 As shown, a raw water buffer tank 3 is also provided on the raw water inlet main pipeline 1, and a raw water buffer tank drain pipe 25 is also connected to the bottom of the raw water buffer tank 3. A first valve for controlling its opening and closing is also provided on the raw water buffer tank drain pipe 25, thereby ensuring constant flow of water through the raw water buffer tank 3. A first raw water inlet control valve 2 is also provided on the raw water inlet side of the raw water inlet main pipeline 1 relative to the raw water inlet side of the raw water buffer tank 3. A raw water pump 4, a second raw water inlet control valve 5 and a raw water flow meter 6 are also sequentially spaced on the raw water inlet side of the raw water buffer tank 3, thereby allowing the raw water pump 4 to enter the refrigerant channel of the condensing system for heat exchange.

[0041] The condensation system of this invention includes an upper condenser 7, a lower condenser 8, a non-condensable gas discharge pipe 9, a qualified distilled water outlet pipe 31, a substandard water outlet pipe 32, a cooling water inlet pipe 29, a cooling water return pipe 30, a distilled water conductivity sensor 33, and a distilled water outlet temperature sensor 34; as shown Figure 1 As shown, the raw water inlet main pipeline 1 is connected to the refrigerant inlet of the upper condenser 7, and the refrigerant outlet of the upper condenser 7 is connected to the refrigerant channel of the final effect preheater 11 through the raw water preheating pipeline 10. The raw water, after being heated by the first heat exchange, flows through the refrigerant channels of each effect preheater 11 for a second heat exchange. The steam outlet of the final effect evaporator 14 is connected to the heat medium inlet of the upper condenser 7 through the pure steam pipeline 20, and the liquid phase outlet of the final effect evaporator 14 is connected to the heat medium inlet of the upper condenser 7 through the distilled water collection pipeline 22. The steam and the distilled water condensed from the steam are cooled by heat exchange with the raw water through the heat medium channel of the upper condenser 7. The upper condenser 7 is connected to the condenser non-condensable gas discharge pipeline 9, and a second valve is provided on the condenser non-condensable gas discharge pipeline 9 to control its on / off state. Non-condensable gases are discharged through the condenser non-condensable gas discharge pipeline 9.

[0042] like Figure 1 As shown, the refrigerant inlet of the lower condenser 8 is connected to the cooling water inlet pipe 29, and the refrigerant outlet of the lower condenser 8 is connected to the cooling water return pipe 30; the heat medium outlet of the upper condenser 7 is connected to the heat medium inlet of the lower condenser 8, and the distilled water cooled by the upper condenser 7 enters the heat medium channel of the lower condenser 8 to exchange heat with the cooling water, thereby performing secondary cooling; the heat medium outlet of the lower condenser 8 is connected to the qualified distilled water outlet pipe 31 and the unqualified water outlet pipe 32 respectively, and distilled water conductivity meters are also installed on them at intervals. Sensor 33 and distilled water outlet temperature sensor 34 are provided with a third valve on the qualified distilled water outlet pipe 31 for controlling its on / off state, and a fourth valve on the unqualified water outlet pipe 32 for controlling its on / off state. The third valve and the fourth valve are electrically connected to the distilled water conductivity sensor 33 and the distilled water outlet temperature sensor 34, respectively. Thus, through the cooperation of the distilled water conductivity sensor 33 and the distilled water outlet temperature sensor 34, the qualified or unqualified state of the distilled water after secondary cooling by the lower condenser 8 is determined.

[0043] Among them, such as Figure 1 As shown, both the upper condenser 7 and the lower condenser 8 are arranged at an angle to ensure zero dead zone discharge of distilled water. The upper condenser 7, the lower condenser 8, and each preheater 11 form refrigerant and heat transfer channels through internal heat exchange tubes, and their built-in heat exchange tubes are arranged in a multi-lead manner to ensure that their refrigerant and heat transfer channels can carry out sufficient heat exchange.

[0044] In this invention, a non-condensable gas collection device 12 is also connected between the refrigerant outlet of the first-effect preheater 11 and the raw water inlet of the first-effect evaporator 14 on the raw water preheating pipeline 10. Figure 1 As shown, the non-condensable gas collection device 12 adopts a fully insulated structure and is connected to the non-condensable gas discharge pipeline 13. A fifth valve for controlling its on / off state is also provided on the non-condensable gas discharge pipeline 13, thereby discharging the non-condensable gas through the non-condensable gas collection device 12 and reducing the non-condensable gas content.

[0045] like Figure 1 As shown, each preheater 11 and evaporator 14 adopts a fully insulated structure, and a secondary steam temperature sensor 21 is also provided on the pure steam pipeline 20 between the steam outlet of each evaporator 14 and the heat medium inlet of the corresponding preheater 11; the liquid phase outlet of the first-effect evaporator 14 is connected to the industrial steam condensate pipeline 23, and a sixth valve for controlling its on / off state is also provided on the industrial steam condensate pipeline 23, so that the generated condensate is discharged through the industrial steam condensate pipeline 23; the bottom of the first-effect evaporator 14 is connected to one end of the hot water disinfection pipeline 24, and the other end of the hot water disinfection pipeline 24 is connected to the first raw material water inlet control valve 2, and a hot water disinfection control valve 35 for controlling its on / off state is also provided on the first raw material water inlet control valve 2, so that the raw material water is disinfected through the hot water disinfection pipeline 24.

[0046] like Figure 1 As shown, the bottom of each effect evaporator 14 is connected to one end of the corresponding evaporator lower drain pipe 26, and the other end of each evaporator lower drain pipe 26 is connected to the evaporator main lower drain pipe 16. Each evaporator lower drain pipe 26 is also equipped with an evaporator lower drain valve 27 for controlling its on / off state. The raw water outlet of the last effect evaporator 14 is connected to the evaporator main lower drain pipe 16 through the raw water preheating pipe 10. The upper end of each concentrated water discharge pipe 15 extends from above the multi-lead labyrinth device 18 to the interior of the corresponding evaporator 14, and is connected to the bottom of the corresponding spiral gas-liquid separator 19. The lower end of each concentrated water discharge pipe 15 is connected to the concentrated water main collection and discharge pipe 28, and is also equipped with a seventh valve for controlling its on / off state. Thus, the concentrated water generated by each effect separation is discharged independently through the concentrated water discharge pipe 15 to ensure the quality of pure steam produced by each effect.

[0047] Each multi-lead maze device 18 of the present invention includes a lower baffle 181, a middle baffle 182, an upper baffle 183, a support column 184, and a support plate 185; as shown Figures 1-4As shown, in the upper part of the interior of each evaporator 14, an upper baffle 183, a middle baffle 182, and a lower baffle 181 are horizontally arranged at intervals from top to bottom. Each upper baffle 183 and lower baffle 181 is a hollow conical structure that matches the interior of the corresponding evaporator 14. The lower surface of each upper baffle 183 and lower baffle 181 is a large-diameter end, and the outer diameter of its large-diameter end is smaller than the inner diameter of the corresponding evaporator 14, thus forming a gap with the inner wall of the corresponding evaporator 14. There is a flow channel for steam flow; several support plates 185 are evenly distributed vertically at intervals along the circumference of the lower surface of each lower baffle 181, and each lower baffle 181 is fixedly connected to the inner wall of the corresponding evaporator 14 through the support plate 185, so as to ensure that the support plate 185 does not interfere with the steam flow; a support column 184 is also coaxially fixed between each upper baffle 183 and the corresponding lower baffle 181, and the support column 184 supports and fixes the corresponding upper baffle 183.

[0048] like Figures 1-4 As shown, each intermediate baffle 182 is an inverted funnel-shaped structure that matches the interior of the corresponding evaporator 14, with its upper end being the large-diameter end, and it is sealed and fixed to the inner wall of the corresponding evaporator 14. The inner diameter of the small-diameter end of each intermediate baffle 182 is larger than the outer diameter of the corresponding support column 184, and they are coaxially spaced and sleeved on the corresponding support column 184, forming a steam flow channel between them. The gap between the lower baffle 181 and the inner wall of the evaporator 14, the gap between the intermediate baffle 182 and the support column 184, and the gap between the upper baffle 183 and the inner wall of the evaporator 14 form an S-shaped flow channel, which separates the steam through three collisions. Several support blocks are also arranged sequentially along the circumferential direction at the bottom of the outer circumference of each support column 184. Each support block is integrally formed with the corresponding support column 184, and the support blocks support and fix the corresponding intermediate baffle 182. The present invention influences the speed and direction of steam flow by cooperating the upper baffle 183, the middle baffle 182 and the lower baffle 181, thereby improving the steam flow path and gas-liquid separation time, improving the quality of pure steam, and laying a good foundation for the separation of the next process spiral gas-liquid separator 19.

[0049] Each spiral gas-liquid separator 19 of the present invention includes a separation cylinder 191, an inner cylinder 192, a gas-liquid separation hole 193, a spiral plate 194, and a fixed liquid-throwing plate 195; for example Figure 2 , Figure 5 , Figure 6As shown, a separation cylinder 191 is vertically and coaxially sleeved at corresponding positions in the upper part of each evaporator 14, and an inner cylinder 192 is vertically and coaxially sleeved inside each separation cylinder 191. A spiral plate 194 spiraling upward is also sleeved coaxially along the axis of each inner cylinder 192. Each separation cylinder 191 and the corresponding inner cylinder 192 form a gap for condensate flow. Several gas-liquid separation holes 193 are evenly distributed and interspersed along the circumferential direction on the outer circumferential surface of the lower half of each inner cylinder 192. Each gas-liquid separation hole 193 is set without interfering with the corresponding rotating plate. The gap between each inner cylinder 192 and the corresponding separation cylinder 191 is connected to the interior of the corresponding inner cylinder 192 through the gas-liquid separation hole 193.

[0050] like Figure 2 , Figure 5 , Figure 6 As shown, several fixed liquid-throwing plates 195 are sequentially and inclined at intervals along the circumferential direction at the top of the outer circumferential surface of each separation cylinder 191. The angle between each fixed liquid-throwing plate 195 and the horizontal plane is 30°. The upper end face of each inner cylinder 192 is fixedly connected to the upper end face of the corresponding separation cylinder 191 through the fixed liquid-throwing plate 195. The pure steam separated by the multi-lead labyrinth device 18 is then introduced into the spiral plate 194 of the corresponding inner cylinder 192 for further separation through the fixed liquid-throwing plate 195. The upper end of each concentrated water discharge pipe 15 extends from above the multi-lead labyrinth device 18 to the interior of the corresponding evaporator 14 and is connected to the bottom of the corresponding separation cylinder 191. It then communicates with the gap between the inner cylinder 192 and the corresponding separation cylinder 191, and discharges the separated condensate separately. The secondary pollution of the pure steam by the condensate further improves the quality of the pure steam.

[0051] The present invention provides a method for preparing distilled water using a rising film evaporation distillation water preparation device, such as... Figures 1-6 As shown, it includes the following steps:

[0052] (1) After the raw water is pumped into the refrigerant channel of the upper condenser 7 by the raw water pump 4 for heat exchange and heating, it flows through the raw water preheating pipe 10 through the refrigerant channel of each effect preheater 11 for secondary heat exchange and heating, and then enters the first effect evaporator 14 through the raw water inlet.

[0053] (2) Industrial steam is introduced into the steam inlet of the first-effect evaporator 14. The industrial steam heats the preheated raw water. After the heat is absorbed, condensate is formed and discharged through the industrial steam condensate pipeline 23.

[0054] (3) The raw water is heated and evaporated by industrial steam to generate secondary steam. The steam moves upward and collides and separates with the lower baffle 181, the middle baffle 182 and the upper baffle 183 in sequence, separating some small water droplets.

[0055] (4) The separated steam continues to move upward through the S-shaped flow channel of the multi-lead labyrinth device 18, flows through the fixed liquid-throwing plate 195 and then enters the spiral plate 194 of the corresponding inner cylinder 192, and undergoes secondary gas-liquid separation through the spiral plate 194. The separated condensate flows into the gap between the separation cylinder 191 and the inner cylinder 192 through the gas-liquid separation hole 193, and is then discharged separately through the concentrated water discharge pipe 15.

[0056] (5) After secondary separation, the steam enters the heat medium channel of the first effect preheater 11 through the steam outlet, and exchanges heat with the raw water in the cold medium channel of the first effect preheater 11. Then, it enters the second effect evaporator 14 through the steam inlet, absorbs heat and condenses into distilled water. The subsequent effects are similar. The distilled water condensed from the secondary steam of the second effect and subsequent effects enters the heat medium channel of the upper condenser 7 through the distilled water collection pipe 22. In addition, the secondary steam of the last effect evaporator 14 enters the heat medium channel of the upper condenser 7 through the corresponding pure steam pipe 20, and exchanges heat with the raw water in the cold medium channel of the upper condenser 7 for cooling.

[0057] (6) Cooling water flows through the refrigerant channel of the lower condenser 8. Then, the distilled water, after being cooled once, exits from the hot medium outlet of the upper condenser 7 and enters the hot medium channel of the lower condenser 8 to exchange heat with the cooling water in the refrigerant channel of the lower condenser 8.

[0058] (7) After secondary cooling, the distilled water exits from the heat medium outlet of the lower condenser 8. Qualified distilled water is collected through qualified distilled water outlet pipe 31, and unqualified distilled water is collected through unqualified water outlet pipe 32.

[0059] (8) The raw water that has not been evaporated in the first-effect evaporator 14 enters the second-effect evaporator 14 through the raw water inlet. The same applies to each subsequent effect until the last effect evaporator 14 is still not evaporated, and then it is discharged through the evaporator's main drain pipe 16.

[0060] The beneficial effects of this invention are:

[0061] (1) By using the multi-lead labyrinth device 18 and the spiral gas-liquid separator 19 together, the present invention effectively removes microbubbles and free gas, removes small water droplets from pure steam, thereby greatly improving the superheat and drying value of pure steam and reducing the content of non-condensable gas.

[0062] (2) By setting up a multi-lead labyrinth device 18, the present invention performs three-stage impact separation of pure steam, thereby improving the steam-water separation effect and increasing the superheat and drying value of pure steam.

[0063] (3) The evaporator 14 and the preheater 11 of the present invention both adopt a fully insulated structure, which improves the thermal energy utilization rate of the whole system, reduces steam consumption, and increases the utilization rate of raw water.

[0064] (4) The heat exchange tubes built into the preheater 11, the upper condenser 7 and the lower condenser 8 of the present invention are all arranged in a multi-lead manner, so as to ensure that the heat exchange between different media can be fully carried out, meet the full utilization of energy, and meet the requirement of heating the raw water to the temperature at which non-condensable gases can be discharged;

[0065] (5) The upper condenser 7 and the lower condenser 8 of the present invention are both arranged in an inclined manner to ensure that the distilled water is discharged with zero dead angle.

[0066] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, all modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the technical requirements.

Claims

1. A rising film evaporation distillation water preparation device, characterized in that: The system includes a condensation system, a preheater, and an evaporator. Six evaporators are arranged vertically side-by-side from left to right, with preheaters spaced vertically between adjacent evaporators. Each evaporator has multi-lead heat exchange tubes arranged for evaporation in its lower half, and a spiral gas-liquid separator and a multi-lead labyrinth device for separation, spaced vertically at intervals, in its upper half. Each evaporator has a raw water inlet and a steam inlet spaced vertically at the middle left side, a raw water outlet at the middle right side, a liquid outlet at the bottom right side, and a steam outlet at the top. The steam outlet of the first-effect evaporator is connected to the steam inlet of the next-effect evaporator via a pure steam pipeline through the heat medium channel of the corresponding preheater, and so on until the last-effect evaporator. The steam outlet of the last-effect evaporator is connected to... The heat medium channel of the condensing system is connected; the liquid phase outlet of the second-effect evaporator is connected to the next-effect evaporator through a distilled water collection pipeline, and so on until the last-effect evaporator, and the liquid phase outlet of the last-effect evaporator is connected to the heat medium channel of the condensing system through a distilled water collection pipeline; after the raw water inlet main pipeline is connected to the refrigerant channel of the condensing system for a first heat exchange, the refrigerant channels of the five preheaters are connected in series from right to left through the raw water preheating pipeline for a second heat exchange, and then connected in series with the corresponding evaporators from left to right through the raw water inlet and raw water outlet for a third heat exchange; the industrial steam pipeline is connected to the steam inlet of the first-effect evaporator, and after the raw water is heated and evaporated by industrial steam, it undergoes gas-liquid separation through the cooperation of a multi-lead labyrinth device and a spiral gas-liquid separator, and is then cooled into distilled water through heat exchange in the condensing system; It also includes a concentrated water discharge pipe, an evaporator bottom discharge pipe, an evaporator bottom discharge valve, a total evaporator bottom discharge pipe, and a concentrated water total collection and discharge pipe; the bottom of each effect evaporator is connected to one end of the corresponding evaporator bottom discharge pipe, and the other end of each evaporator bottom discharge pipe is connected to the total evaporator bottom discharge pipe, and each evaporator bottom discharge pipe is also provided with an evaporator bottom discharge valve for controlling its on / off state; the raw water outlet of the last effect evaporator is connected to the total evaporator bottom discharge pipe through a raw water preheating pipe; the upper end of each concentrated water discharge pipe extends above the multi-lead labyrinth device to the interior of the corresponding evaporator, and is connected to the bottom of the corresponding spiral gas-liquid separator, and the lower end of each concentrated water discharge pipe is connected to the total concentrated water collection and discharge pipe, and is also provided with a seventh valve for controlling its on / off state, thereby independently discharging the concentrated water generated by each effect separation through the concentrated water discharge pipe; Each of the multi-lead labyrinth devices includes a lower baffle, a middle baffle, an upper baffle, a support column, and a support plate. In the upper half of the interior of each evaporator, corresponding positions are provided with an upper baffle, a middle baffle, and a lower baffle arranged horizontally from top to bottom at intervals. Each upper and lower baffle is a hollow conical structure matching the interior of the corresponding evaporator. The lower surface of each upper and lower baffle is a large-diameter end, and the outer diameter of its large-diameter end is smaller than the inner diameter of the corresponding evaporator, thus forming a steam flow channel with the inner wall of the corresponding evaporator. Several support plates are evenly distributed vertically at intervals along the circumference of the lower surface of each lower baffle, and each lower baffle is fixedly connected to the inner wall of the corresponding evaporator through the support plates, ensuring that the support plates do not interfere with the steam flow. A vertically fixed support column is also coaxially fixed between each upper baffle and the corresponding lower baffle. The system includes support columns that support and fix the corresponding upper baffles. Each intermediate baffle is an inverted funnel-shaped structure that matches the interior of the corresponding evaporator, with its upper end being the large-diameter end, which is sealed and fixed to the inner wall of the corresponding evaporator. The inner diameter of the small-diameter end of each intermediate baffle is larger than the outer diameter of the corresponding support column, and they are coaxially spaced and fitted onto the corresponding support column, forming a steam flow channel between them. An S-shaped flow channel is formed through the gaps between the lower baffle and the inner wall of the evaporator, the gaps between the intermediate baffle and the support column, and the gaps between the upper baffle and the inner wall of the evaporator, resulting in three collisions and separations of the steam. Several support blocks are also sequentially spaced along the circumferential direction at the bottom of the outer circumference of each support column. Each support block is integrally formed with the corresponding support column, thereby supporting and fixing the corresponding intermediate baffle.

2. The distilled water preparation equipment using rising film evaporation according to claim 1, characterized in that: It also includes a raw water buffer tank, a raw water buffer tank drain pipe, a first raw water inlet control valve, a raw water pump, a second raw water inlet control valve, and a raw water flow meter; a raw water buffer tank is also provided on the main raw water inlet pipe, and a raw water buffer tank drain pipe is also connected to the bottom of the raw water buffer tank, and a first valve for controlling its opening and closing is also provided on the raw water buffer tank drain pipe, thereby ensuring constant flow of water through the raw water buffer tank; a first raw water inlet control valve is also provided on the raw water inlet side of the main raw water inlet pipe relative to the raw water buffer tank, and a raw water pump, a second raw water inlet control valve, and a raw water flow meter are sequentially spaced on it relative to the raw water outlet side of the raw water buffer tank, thereby pumping the raw water into the refrigerant channel of the condensing system for heat exchange through the raw water pump.

3. The distilled water preparation equipment using rising film evaporation according to claim 2, characterized in that: The condensation system includes an upper condenser, a lower condenser, a condenser non-condensable gas discharge pipeline, a qualified distilled water outlet pipeline, a non-qualified water outlet pipeline, a cooling water inlet pipeline, a cooling water return pipeline, a distilled water conductivity sensor, and a distilled water outlet temperature sensor. The raw water inlet pipeline is connected to the refrigerant inlet of the upper condenser, and the refrigerant outlet of the upper condenser is connected to the refrigerant channel of the final-effect preheater through a raw water preheating pipeline, thereby allowing the raw water, after being heated by the first heat exchange, to flow sequentially through the refrigerant channels of each effect preheater for secondary heat exchange. The steam outlet of the final-effect evaporator is connected to the heat medium inlet of the upper condenser through a pure steam pipeline, and the liquid phase outlet of the final-effect evaporator is connected to the heat medium inlet of the upper condenser through a distilled water collection pipeline, thereby allowing the steam and the condensed distilled water to exchange heat with the raw water and cool it down through the heat medium channel of the upper condenser. The upper condenser is connected to the condenser non-condensable gas discharge pipeline, and a second valve for controlling its on / off state is also provided on the condenser non-condensable gas discharge pipeline, thereby allowing the condenser to... Non-condensable gas is discharged through a non-condensable gas emission pipe; the refrigerant inlet of the lower condenser is connected to the cooling water inlet pipe, and the refrigerant outlet of the lower condenser is connected to the cooling water return pipe; the heat medium outlet of the upper condenser is connected to the heat medium inlet of the lower condenser, and the distilled water cooled by the upper condenser enters the heat medium channel of the lower condenser to exchange heat with the cooling water, thereby undergoing secondary cooling; the heat medium outlet of the lower condenser is connected to the qualified distilled water outlet pipe and the unqualified water outlet pipe respectively, and a distilled water conductivity sensor and a distilled water outlet temperature sensor are sequentially and spaced apart on them; a third valve for controlling its on / off state is provided on the qualified distilled water outlet pipe, and a fourth valve for controlling its on / off state is provided on the unqualified water outlet pipe; the third valve and the fourth valve are electrically connected to the distilled water conductivity sensor and the distilled water outlet temperature sensor respectively, and thus, through the cooperation of the distilled water conductivity sensor and the distilled water outlet temperature sensor, the qualification of the distilled water after secondary cooling by the lower condenser is determined.

4. The distilled water preparation equipment using rising film evaporation according to claim 3, characterized in that: Both the upper and lower condensers are arranged at an angle to ensure zero dead zone discharge of distilled water. The upper condenser, lower condenser, and each of the preheaters form refrigerant and heat transfer channels through internal heat exchange tubes, and the built-in heat exchange tubes are arranged in a multi-lead manner to ensure that the refrigerant and heat transfer channels can carry out sufficient heat exchange.

5. The distillation water preparation equipment using rising film evaporation according to claim 3, characterized in that: It also includes a non-condensable gas collection device and a non-condensable gas discharge pipeline; a non-condensable gas collection device is also connected between the refrigerant outlet of the first-effect preheater and the raw water inlet of the first-effect evaporator on the raw water preheating pipeline. The non-condensable gas collection device adopts a fully insulated structure and is connected to the non-condensable gas discharge pipeline. A fifth valve for controlling its on / off state is also provided on the non-condensable gas discharge pipeline, so that the non-condensable gas is discharged through the non-condensable gas collection device, thereby reducing the non-condensable gas content.

6. The distillation water preparation equipment using rising film evaporation according to claim 3, characterized in that: It also includes an industrial steam condensate pipeline, a hot water disinfection pipeline, and a hot water disinfection control valve; each of the preheaters and evaporators adopts a fully insulated structure, and a secondary steam temperature sensor is also provided on the pure steam pipeline between the steam outlet of each evaporator and the heat medium inlet of the corresponding preheater; the liquid phase outlet of the first-effect evaporator is connected to the industrial steam condensate pipeline, and a sixth valve for controlling its on / off state is also provided on the industrial steam condensate pipeline, thereby discharging the generated condensate through the industrial steam condensate pipeline; the bottom of the first-effect evaporator is connected to one end of the hot water disinfection pipeline, and the other end of the hot water disinfection pipeline is connected to the first raw material water inlet control valve, and a hot water disinfection control valve for controlling its on / off state is also provided on the first raw material water inlet control valve, thereby disinfecting the raw material water through the hot water disinfection pipeline.

7. The distillation water preparation equipment using rising film evaporation according to claim 3, characterized in that: Each of the spiral gas-liquid separators includes a separator cylinder, an inner cylinder, gas-liquid separation holes, a spiral plate, and a fixed liquid-throwing plate. A separator cylinder is vertically and coaxially spaced within the upper half of the interior of each evaporator. An inner cylinder is also vertically and coaxially spaced within each separator cylinder, and a spiral plate spiraling upwards is coaxially spaced within each inner cylinder. A gap is formed between each separator cylinder and its corresponding inner cylinder to allow condensate flow. Several gas-liquid separation holes are evenly distributed and spaced along the circumferential direction on the outer circumferential surface of the lower half of each inner cylinder. Each gas-liquid separation hole is designed to not interfere with the corresponding rotating plate, and the gap between each inner cylinder and its corresponding separator cylinder is cleared by... The gas-liquid separation hole is connected to the interior of the corresponding inner cylinder; several fixed liquid-throwing plates are arranged at intervals along the circumferential direction at the top of the outer circumferential surface of each separation cylinder, and the angle between each fixed liquid-throwing plate and the horizontal plane is 30°. The upper end face of each inner cylinder is fixedly connected to the upper end face of the corresponding separation cylinder through the fixed liquid-throwing plates. The pure steam separated by the multi-lead labyrinth device is then introduced into the spiral plate of the corresponding inner cylinder for further separation through the fixed liquid-throwing plates. The upper end of each concentrated water discharge pipe extends from above the multi-lead labyrinth device to the interior of the corresponding evaporator and is connected to the bottom of the corresponding separation cylinder. It is then connected to the gap between the inner cylinder and the corresponding separation cylinder to discharge the separated condensate separately.

8. The method for preparing distilled water using a rising film evaporation distillation water preparation device according to claim 7, characterized in that... Includes the following steps: (1) After the raw water is pumped into the refrigerant channel of the upper condenser by the raw water pump for heat exchange and heating, it flows through the refrigerant channel of each effect preheater through the raw water preheating pipeline for secondary heat exchange and heating, and then enters the first effect evaporator through the raw water inlet. (2) Industrial steam is introduced into the steam inlet of the first-effect evaporator. The industrial steam heats the preheated raw water. After the heat is absorbed, condensate is formed and discharged through the industrial steam condensate pipeline. (3) The raw water is heated and evaporated by industrial steam to generate secondary steam. The steam moves upward and collides and separates with the lower baffle, the middle baffle and the upper baffle in sequence, separating some small water droplets. (4) The separated steam continues to move upward through the S-shaped flow channel of the multi-lead labyrinth device, flows through the fixed liquid-throwing plate and then enters the spiral plate of the corresponding inner cylinder, and undergoes secondary gas-liquid separation through the spiral plate. The separated condensate flows into the gap between the separation cylinder and the inner cylinder through the gas-liquid separation hole, and is then discharged separately through the concentrated water discharge pipe. (5) After secondary separation, the steam enters the heat medium channel of the first effect preheater through the steam outlet, and exchanges heat with the raw water in the cold medium channel of the first effect preheater. Then, it enters the second effect evaporator through the steam inlet, absorbs heat and condenses into distilled water. The subsequent effects are similar. The distilled water condensed from the secondary steam of the second effect and subsequent effects enters the heat medium channel of the upper condenser through the distilled water collection pipeline. In addition, the secondary steam of the last effect evaporator enters the heat medium channel of the upper condenser through the corresponding pure steam pipeline and exchanges heat with the raw water in the cold medium channel of the upper condenser for cooling. (6) Cooling water flows through the refrigerant channel of the lower condenser. Then, after being cooled once, the distilled water exits from the heat medium outlet of the upper condenser and enters the heat medium channel of the lower condenser to exchange heat with the cooling water in the refrigerant channel of the lower condenser. (7) After secondary cooling, the distilled water exits from the heat medium outlet of the lower condenser. Qualified distilled water is collected through the qualified distilled water outlet pipe, and unqualified distilled water is collected through the unqualified water outlet pipe. (8) The raw water that has not been evaporated in the first effect evaporator enters the second effect evaporator through the raw water inlet. The same applies to each subsequent effect until the last effect evaporator. If the raw water has not been evaporated, it is discharged through the main drain pipe of the evaporator.

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