Thermal cycle distillation system

Abstract

The invention discloses a heat cycle distillation system, which comprises an electromagnetic distillation pressure furnace and a heat recovery cone-pot steam turbine, the electromagnetic distillation pressure furnace comprises a pressure tank body with a heater at the lower part, and the pressure tank body is provided with a salt discharge port, a water inlet pipe, a high-pressure air inlet pipe and a low-temperature high-pressure steam discharge pipe; the heat recovery cone-pot steam turbine comprises an annular spray pipe and a cone-pot steam turbine, the cone-pot steam turbine comprises a cone-pot shell, steam turbine blades and a transmission shaft, and a fluid outlet is formed in the bottom of the cone-pot shell; a low-temperature high-pressure steam inlet and a nozzle are arranged on the annular spray pipe, and an outlet of the nozzle faces the steam turbine blade; a cold cap is arranged above the steam turbine blades, and a cold core is arranged in an inner cavity of the lower portion of the conical kettle steam turbine. The low-temperature high-pressure steam discharge pipe is communicated with the low-temperature high-pressure steam inlet. According to the heat cycle distillation system provided by the invention, when seawater is distilled into drinkable water, energy is output in a low-temperature high-pressure steam form, so that the efficiency of converting non-waste heat energy into mechanical energy is greatly improved, and the difficulty of waste heat recovery can also be reduced.

Description

Technical Field

[0001] This invention relates to the field of seawater desalination, and more particularly to a thermal circulating distillation system. Background Technology

[0002] Boiling one liter of water at room temperature and pressure requires approximately 0.12 kWh, while vaporization under boiling conditions requires 0.60 kWh. Adding the energy consumption of cooling equipment (if available), producing one liter of water with existing equipment typically requires around 0.8 kWh, which is very energy-intensive. The reasons are as follows:

[0003] 1) Without a heat recovery system, all used heat energy is wasted.

[0004] 2) Additional cooling equipment (if available) is required and consumes energy.

[0005] It is evident that significantly reducing the energy consumption of a distillation water system requires a highly efficient heat recovery still and a thermal energy recycling system. The heat recovery still needs to use the generated steam to drive a heat recovery turbine. However, the steam temperature produced by traditional distillation pressure furnaces exceeds 200°C, which is too high, making heat preservation difficult and subsequent heat recovery challenging. This results in low thermal energy recovery efficiency and a low proportion of total energy converted into mechanical energy. Summary of the Invention

[0006] The purpose of this invention is to provide a thermal circulating distillation system that can solve the above-mentioned technical problems.

[0007] To achieve the above objectives, the present invention provides a thermal circulating distillation system, including an electromagnetic distillation pressure furnace and a heat recovery conical turbine. The electromagnetic distillation pressure furnace includes a pressure tank with a heater at the bottom, and from bottom to top, the pressure tank has a salt outlet, a water inlet pipe, a high-pressure air inlet pipe, and a low-temperature high-pressure steam outlet pipe. The heat recovery conical turbine includes a ring nozzle and a conical turbine that rotate relative to each other. The conical turbine includes a conical shell, turbine blades, and a drive shaft connected together. The drive shaft has a generator connection end, and the bottom of the conical shell has a fluid outlet. The ring nozzle has a low-temperature high-pressure steam inlet and a nozzle, with the nozzle outlet facing the turbine blades. A cold cap is provided above the turbine blades, and a cold core is provided in the lower inner cavity of the conical turbine. The low-temperature high-pressure steam outlet pipe is connected to the low-temperature high-pressure steam inlet.

[0008] Furthermore, it also includes a heat source cooling and other heat regeneration power system, which is equipped with a high-pressure gas pipe and a gas return pipe; the cold cap is equipped with a first gas inlet and a first gas outlet, and the cold core is equipped with a second gas inlet and a second gas outlet; the output end of the high-pressure gas pipe is connected to the first gas inlet and the second gas inlet respectively, the first gas outlet is connected to the input end of the gas return pipe, and the second gas outlet is connected to the high-pressure gas inlet pipe.

[0009] Furthermore, the cold cap includes a cold cap shell, with a hole in the middle through which the drive shaft passes; an airflow channel is formed in the inner cavity of the cold cap shell by a number of airflow guide plates connected thereto; the cold cap shell is provided with a first air inlet and a first air outlet respectively connected to the two ends of the airflow channel; the airflow channel is located above the turbine blades, and the side wall of the cold cap shell is provided with a notch for avoiding the nozzle.

[0010] Furthermore, the cold core includes a coil support, with a support base connected to the bottom of the coil support. A heat exchange coil is installed on the coil support, with the second gas inlet and the second gas outlet at both ends of the heat exchange coil, respectively.

[0011] Furthermore, the conical kettle shell includes an upper inverted cone and a lower inverted cone, which are connected by a waist channel; the inner wall of the waist channel is connected to the drive shaft by a guide fan blade, and the inner wall of the upper inverted cone shell is connected to the drive shaft by a swirl-reducing rib; the fluid outlet is located at the bottom of the lower inverted cone, and a swirl-reducing wing plate is provided on the lower inner wall of the lower inverted cone; the turbine blade is located at the top of the upper inverted cone.

[0012] Furthermore, the top of the upper inverted cone is provided with an upper cover plate and a lower sealing plate, and the edges of the upper cover plate and the lower sealing plate are connected by an arc sealing plate. The turbine blades are connected to the outside of the arc sealing plate, and both the lower sealing plate and the upper cover plate are connected to the drive shaft. There are at least two turbine blades, and the tops of each turbine blade are connected by the same arc rib.

[0013] Furthermore, the annular nozzle also includes an annular pipe, and the low-temperature high-pressure steam inlet, the annular pipe and the nozzle are connected in sequence. The outlet direction of the nozzle is at an angle to the rotation radius of the turbine blades. An insulation shell is provided on the outside of the annular pipe.

[0014] Furthermore, the outer wall of the cone-shaped kettle shell is provided with a cone-shaped kettle insulation shell, and the pressure tank is wrapped with an insulation shell.

[0015] Furthermore, the heater includes an electromagnetic heating coil, which is disposed on the outer side wall of the lower part of the pressure tank and located between the salt outlet and the water inlet pipe.

[0016] Beneficial effects

[0017] Compared with the prior art, the advantages of the thermal circulating distillation system of the present invention are:

[0018] 1. A high-efficiency heat recovery still is constructed by an electromagnetic distillation pressure furnace and a heat recovery conical steam turbine. The electromagnetic distillation pressure furnace generates low-pressure, high-temperature steam. This low-temperature, high-pressure steam enters the annular nozzle and is ejected through the nozzle, driving the turbine blades to rotate. This, in turn, drives a generator to produce electricity via a drive shaft. During this process, some of the steam's waste heat is transferred to the gases in the cold cap and cold core and recovered into the heat cycle recovery system. The steam is cooled to form condensate, which is discharged from the fluid outlet at the bottom of the conical shell. The temperature of the low-temperature, high-pressure steam is generally below 200℃, typically around 180℃. Its function is to convert high-temperature energy into pressure energy while increasing the mass of the energy transfer medium. Its advantages include: reducing the difficulty of heat preservation; reducing the difficulty of subsequent heat recovery, making it easier to achieve a heat energy recovery rate of over 90%; significantly increasing the proportion of potential energy in the total energy while significantly decreasing the proportion of temperature energy, ultimately leading to a significant increase in the proportion of total energy converted into mechanical energy. This system distills seawater into potable water while outputting energy in the form of low-temperature, high-pressure steam. This greatly improves the efficiency of converting non-waste heat energy into mechanical energy, which can be converted into electrical energy for storage. It also reduces the difficulty of waste heat recovery.

[0019] 2. After the low-temperature, high-pressure steam enters the conical kettle shell, it moves towards the center of the kettle along the turbine blades and falls into the kettle under the guidance of the guide fan blades. The cooled steam becomes condensate + steam, rotating at high speed downwards in the kettle while converging towards the central axis. Most of the remaining potential energy of the condensate and steam is absorbed by the kettle body, mainly by anti-spin ribs, and converted into mechanical energy, which is ultimately converted into electrical energy generated by the generator, further improving energy recovery efficiency.

[0020] 3. Condensate and steam fall into the lower chamber of the conical kettle. The energy of the steam is recovered by the cold cap into the heat recovery system. Finally, the low-temperature, high-pressure steam is converted into low-energy cold air and condensate, which are discharged from the fluid outlet at the bottom of the kettle and can be treated into drinking water. Part of the residual heat of the condensate and steam is absorbed by the cold core. The cold core sends the lower-temperature, high-pressure gas flow into the pressure tank of the distillation pressure furnace and cools the high-temperature steam in the distillation pressure furnace to form low-temperature, high-pressure steam. This low-temperature, high-pressure steam then enters the annular nozzle from the low-temperature, high-pressure steam inlet for reuse.

[0021] 4. The ring nozzle has multiple nozzles, which allows the turbine blades to be subjected to more even force.

[0022] 5. The function of the guide fan blades is to prevent steam from overflowing from the top of the kettle and to control the direction of airflow.

[0023] 6. The outer wall of the conical kettle is equipped with a conical kettle insulation shell to prevent energy leakage as much as possible. The insulation shell of the pressure vessel prevents heat loss, and the heat escape energy is controlled within 0.5%.

[0024] 7. The purpose of the rotor blades is to collect the remaining potential energy of the condensate.

[0025] The invention will become clearer from the following description, taken in conjunction with the accompanying drawings, which are used to explain embodiments of the invention. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a thermal circulating distillation system;

[0028] Figure 2 This is a front view of the electromagnetic distillation pressure furnace;

[0029] Figure 3 This is a right-side sectional view of an electromagnetic distillation pressure furnace.

[0030] Figure 4 This is a front view of a heat recovery cone turbine.

[0031] Figure 5 This is a top view of a heat recovery cone turbine.

[0032] Figure 6 for Figure 5 1-1 view;

[0033] Figure 7 for Figure 6 2-2 view;

[0034] Figure 8 This is a front view of a cone turbine.

[0035] Figure 9 This is a top view of a cone turbine.

[0036] Figure 10 This is a front sectional view of a cone turbine.

[0037] Figure 11 for Figure 10 3-3 view;

[0038] Figure 12 for Figure 10 4-4 view;

[0039] Figure 13 for Figure 10 5-5 view;

[0040] Figure 14 This is a top view of the beanie;

[0041] Figure 15 This is the front view of the beanie;

[0042] Figure 16 This is a horizontal cross-sectional view of the airflow channel of the cold cap;

[0043] Figure 17 This is a vertical sectional view of the cold hat;

[0044] Figure 18 This is a top view of the cold core;

[0045] Figure 19 This is a top view of the annular nozzle. Detailed Implementation

[0046] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0047] Example

[0048] Specific embodiments of the present invention are as follows: Figures 1 to 19 As shown, a thermal distillation system includes a thermal recovery still consisting of an electromagnetic distillation pressure furnace 1 and a heat recovery conical steam turbine 2. The electromagnetic distillation pressure furnace 1 includes a pressure tank 11 with a heater at the bottom. The pressure tank 11 has, from bottom to top, a brine outlet 17, a water inlet pipe 13, a high-pressure steam inlet pipe 14, and a low-temperature high-pressure steam outlet pipe 15. The heater includes an electromagnetic heating coil 16, which is disposed on the outer wall of the lower part of the pressure tank 11, between the brine outlet 17 and the water inlet pipe 13. In this embodiment, the pressure tank 11 is arranged vertically.

[0049] The pressure tank 11 is encased in an insulation shell 12 to prevent heat loss, with heat escape energy controlled to within 0.5%. A water level control valve is installed inside the pressure tank 11. In this embodiment, the water level control valve is a float valve 131, which is connected to the end of the water inlet pipe 13. The float valve 131 automatically controls the water level inside the pressure tank 11, preventing water from flowing back into the high-pressure air inlet pipe 14.

[0050] The brine outlet 17 is connected to a brine discharge valve 171. By setting up the brine discharge outlet, when the sludge or high-concentration brine at the bottom of the inner cavity of the pressure tank 11 accumulates to a certain level, it can be discharged through this outlet to ensure the effective water storage capacity inside the pressure tank 11. The lower part of the pressure tank 11 is an inverted cone, and the brine discharge outlet 17 is located at the bottom of the inverted cone, which is conducive to the discharge of brine or residue.

[0051] The heat recovery cone turbine 2 includes an annular nozzle 21 and a cone turbine 23 that are rotatably coupled. The cone turbine 23 includes a cone shell 231, turbine blades 233, and a drive shaft 232 connected to each other. The drive shaft 232 has a generator connection end, which is linked to a generator 4. The generator 4 and the electromagnetic heating coil 16 are both connected to a starting power supply 5 via cables. The bottom of the cone shell 231 has a fluid outlet 2310. The annular nozzle 21 has a low-temperature, high-pressure steam inlet 211 and a nozzle 213, with the nozzle 213's outlet facing the turbine blades 233. A cold cap 22 is provided above the turbine blades 233, and a cold core 24 is provided in the lower inner cavity of the cone turbine 23. The low-temperature, high-pressure steam discharge pipe 15 is connected to the low-temperature, high-pressure steam inlet 211.

[0052] The outer wall of the cone-shaped kettle shell 231 is provided with a cone-shaped kettle insulation shell 230.

[0053] The cooling cap 22 includes a cooling cap outer shell 221, with a hole 222 in the middle of the cooling cap outer shell 221 through which the drive shaft 232 passes. An airflow channel 226 is formed in the inner cavity of the cooling cap outer shell 221 by several airflow guide plates 225 connected thereto. The cooling cap outer shell 221 has a first air inlet 223 and a first air outlet 224 respectively connected to both ends of the airflow channel 226. The airflow channel 226 is located above the turbine blades 233, and a notch 227 is provided on the side wall of the cooling cap outer shell 221 to avoid the nozzle 213.

[0054] The cold core 24 includes a coil support 242, with a support base 243 connected to its bottom. A heat exchange coil 241 is mounted on the coil support 242, with a second gas inlet 244 and a second gas outlet 245 at its two ends. The coil support 242 and the heat exchange coil 241 are located within the lower inverted cone of the conical shell 231. The support base 243 of the cold core 24 extends downward from the fluid outlet 2310 to below the conical shell 231, and the cold core 24 does not rotate with the conical turbine 23. A water collection tank 25 for collecting condensate is provided below the fluid outlet 2310.

[0055] The conical kettle shell 231 includes an upper inverted cone and a lower inverted cone, with the lower end cross-sectional dimension of the upper inverted cone being smaller than the upper end cross-sectional dimension of the lower inverted cone. The lower end of the upper inverted cone and the upper end of the lower inverted cone are connected by a waist channel 2312. The inner wall of the waist channel 2312 is connected to the drive shaft 232 by at least two guide vanes 239, and the inner wall of the upper inverted cone of the conical kettle shell 231 is connected to the drive shaft 232 by six anti-spin ribs 238. The fluid outlet 2310 is located at the bottom of the lower inverted cone, and six anti-spin ribs 2311 are provided on the lower inner wall of the lower inverted cone. The turbine blades 233 are multiple and located at the top of the upper inverted cone.

[0056] The top of the inverted cone is provided with an upper cover plate 235 and a lower sealing plate 236, both of which are circular. The edges of the upper cover plate 235 and the lower sealing plate 236 are connected by an arc-shaped sealing plate 237. Each turbine blade 233 is connected to the outside of the arc-shaped sealing plate 237. The middle of both the lower sealing plate 236 and the upper cover plate 235 are connected to the drive shaft 232. There are at least two turbine blades 233, and the tops of each turbine blade 233 are connected by the same arc-shaped rib plate 234.

[0057] The annular nozzle 21 also includes an annular pipe 212. The low-temperature high-pressure steam inlet 211, the annular pipe 212, and the nozzle 213 are connected in sequence. The outlet direction of the nozzle 213 forms an angle with the rotation radius of the turbine blade 233. An insulating shell is provided on the outer side of the annular pipe 212. The outer edge of the turbine blade 233 is provided with an indented notch to avoid interference between the nozzle 213 and the nozzle 213.

[0058] The thermal circulation distillation system also includes a heat source cooling and residual heat regeneration power system 3, which is equipped with a high-pressure gas pipe 31 and a gas return pipe 32. The cold cap 22 is equipped with a first gas inlet 223 and a first gas outlet 224, and the cold core 24 is equipped with a second gas inlet 244 and a second gas outlet 245. The output end of the high-pressure gas pipe 31 is connected to the first gas inlet 223 and the second gas inlet 244, respectively. The first gas outlet 224 is connected to the input end of the gas return pipe 32, and the second gas outlet 245 is connected to the high-pressure gas inlet pipe 14 through an electromagnetic flow valve 141.

[0059] The heat source cooling and residual heat regeneration power system 3 adopts the technical solution with application number 202111358063.0, publication number CN114017135A, and titled "Heat Source Cooling and Residual Heat Regeneration Power System". The pipeline at the output end of the gas storage tank in the heat source cooling and residual heat regeneration power system 3 serves as a high-pressure gas pipe 31.

[0060] The system operates as follows:

[0061] (1) The heat source cooling and other heat regeneration power system 3 is started, and the cold cap 22 and cold core 24 of the heat recovery cone turbine 2 are supplied with cooling through the high pressure gas pipe 31.

[0062] (2) Turn on the power supply 5 to supply power to the electromagnetic heating coil 16 of the electromagnetic distillation pressure furnace 1.

[0063] (3) The water in the pressure tank 11 of the electromagnetic distillation pressure furnace 1 generates steam under the action of electromagnetic force. The high pressure inlet pipe 14 injects high pressure gas into the pressure tank 11. After the high temperature steam and the high pressure gas mix, the temperature decreases. The low temperature high pressure steam is discharged from the low temperature high pressure steam outlet pipe 15 and enters the heat recovery cone turbine 2 through the nozzle 213 of the ring nozzle 21. The low temperature high pressure steam drives the turbine blades 233, thereby driving the drive shaft 232 to rotate.

[0064] (4) The heat recovery cone turbine 2 converts almost all of the non-waste heat energy of the low-temperature high-pressure steam into mechanical energy, which is fed back to the electromagnetic distillation pressure furnace 1 as electrical energy through the generator 4. The waste heat energy of the low-temperature high-pressure steam is recovered by the gas in the cold cap 22 and cold core 24, and is completely recovered to the heat source cooling and residual heat regeneration power system 3 through heat exchange. Part of it is sent into the electromagnetic distillation pressure furnace 1 as high-pressure gas through the high-pressure inlet pipe 14, and the other part is sent back to the heat source cooling and residual heat regeneration power system 3 as active energy through the gas return pipe 32.

[0065] (5) After the system starts up normally, turn off the power supply 5.

[0066] (6) The electromagnetic distillation pressure furnace 1 is a heat-insulated, sealed combustion chamber that is powered by the feedback power from the heat recovery cone turbine 2 and the feedback high-pressure gas from the heat source cooling and other heat regeneration power system 3.

[0067] (7) After passing through the heat recovery cone turbine 2, the high-pressure steam is converted into distilled water with extremely low energy and residual gas is discharged from the fluid outlet 2310.

[0068] (8) The float valve inside the electromagnetic distillation pressure furnace 1 will automatically control the water level inside the furnace.

[0069] (9) The heat source is cooled and the remaining heat regeneration power system 3 is kept stable by the electric flow valve 141 and external power, thereby maintaining the distillation water production operation of the entire heat circulation distillation system.

[0070] The energy consumption of the "thermal circulating distillation system" after normal operation is evaluated based on the principle of energy conservation:

[0071] 0 = Q 水 +N 电 +N 入气 -Q 排水 -Q w -N 排气 -N w

[0072] Q 水 —Input water energy into the furnace;

[0073] N 电 —The electrical energy input to the heat circulation system;

[0074] N 入气 —The energy of the air drawn into the heat circulation system;

[0075] Q 排水 —Energy released from condensate;

[0076] Q w —Minor energy losses within the “thermal circulation still” include water vapor splashing, temperature reduction, air resistance, pipe resistance, and bearing friction;

[0077] N 排气 —The energy used to expel air from the system;

[0078] N w —The overall energy loss of the heat circulation system can be controlled within 10% of the total energy of the heat circulation system.

[0079] Among them: Q 水 -Q 排水 ≈0

[0080] N 入气 -N 排气 ≈0

[0081] The formula simplifies to:

[0082] N 电 =Q w +N w

[0083] It can be seen that N 电 It refers to the total energy consumption of the system, and Q... w It is difficult to calculate and statistically analyze, but its total amount, if we take the energy consumption M for producing distilled water with existing equipment as a reference, is Q. w It can be controlled within 5% M; similarly, N w It can be controlled within 3% M.

[0084] Therefore, it can be understood that the energy consumption of the "thermal circulation distillation system" is about 10% of that of existing equipment.

[0085] The present invention has been described above in conjunction with the preferred embodiments, but the present invention is not limited to the embodiments disclosed above, but should cover various modifications and equivalent combinations made in accordance with the essence of the present invention.

Claims

1. A thermal circulating distillation system, characterized in that, The system includes an electromagnetic distillation pressure furnace (1) and a heat recovery conical steam turbine (2). The electromagnetic distillation pressure furnace (1) includes a pressure tank (11) with a heater at the bottom. The pressure tank (11) is provided with a salt outlet (17), a water inlet pipe (13), a high-pressure air inlet pipe (14), and a low-temperature high-pressure steam outlet pipe (15) from bottom to top. The heat recovery conical steam turbine (2) includes a ring nozzle (21) and a conical steam turbine (23) that rotate relative to each other. The conical steam turbine (23) includes a conical shell (231) and turbine blades (233) connected to each other. The conical turbine (23) has a generator connection end and a fluid outlet (2310) at the bottom of the casing (231). The ring nozzle (21) has a low-temperature high-pressure steam inlet (211) and a nozzle (213), with the nozzle (213) outlet facing the turbine blade (233). A cold cap (22) is provided above the turbine blade (233), and a cold core (24) is provided in the lower inner cavity of the conical turbine (23). The low-temperature high-pressure steam discharge pipe (15) is connected to the low-temperature high-pressure steam inlet (211).

2. The thermal circulating distillation system according to claim 1, characterized in that, It also includes a heat source cooling and residual heat regeneration power system (3), which is provided with a high-pressure air pipe (31) and a gas return pipe (32); the cold cap (22) is provided with a first air inlet (223) and a first air outlet (224), and the cold core (24) is provided with a second gas inlet (244) and a second gas outlet (245); the output end of the high-pressure air pipe (31) is connected to the first air inlet (223) and the second gas inlet (244) respectively, the first air outlet (224) is connected to the input end of the gas return pipe (32), and the second gas outlet (245) is connected to the high-pressure air inlet pipe (14).

3. The thermal circulating distillation system according to claim 2, characterized in that, The cold cap (22) includes a cold cap shell (221), with a hole (222) in the middle of the cold cap shell (221), through which the drive shaft (232) passes; the inner cavity of the cold cap shell (221) is formed by several airflow guide plates (225) connected thereto to form an airflow channel (226), and the cold cap shell (221) is provided with a first air inlet (223) and a first air outlet (224) respectively connected to both ends of the airflow channel (226); the airflow channel (226) is located above the turbine blade (233), and the side wall of the cold cap shell (221) is provided with a notch (227) for avoiding the nozzle (213).

4. A thermal circulating distillation system according to claim 2, characterized in that, The cold core (24) includes a coil support (242), a support base (243) is connected to the bottom of the coil support (242), a heat exchange coil (241) is installed on the coil support (242), and the two ends of the heat exchange coil (241) are the second gas inlet (244) and the second gas outlet (245), respectively.

5. A thermal circulating distillation system according to claim 1 or 3, characterized in that, The conical kettle shell (231) includes an upper inverted cone and a lower inverted cone, which are connected by a waist channel (2312). The inner wall of the waist channel (2312) is connected to the drive shaft (232) by a guide fan blade (239). The inner wall of the upper inverted cone of the conical kettle shell (231) is connected to the drive shaft (232) by a swirl-reducing rib (238). The fluid outlet (2310) is located at the bottom of the lower inverted cone, and a swirl-reducing wing plate (2311) is provided on the lower inner wall of the lower inverted cone. The turbine blade (233) is located at the top of the upper inverted cone.

6. A thermal circulating distillation system according to claim 5, characterized in that, The top of the upper inverted cone is provided with an upper cover plate (235) and a lower sealing plate (236). The edges of the upper cover plate (235) and the lower sealing plate (236) are connected by an arc sealing plate (237). The turbine blade (233) is connected to the outside of the arc sealing plate (237). Both the lower sealing plate (236) and the upper cover plate (235) are connected to the drive shaft (232). There are at least two turbine blades (233), and the top of each turbine blade (233) is connected by the same arc rib plate (234).

7. A thermal circulating distillation system according to claim 1, characterized in that, The annular nozzle (21) also includes an annular pipe (212). The low-temperature high-pressure steam inlet (211), the annular pipe (212) and the nozzle (213) are connected in sequence. The outlet direction of the nozzle (213) is at an angle to the rotation radius of the turbine blade (233). The annular pipe (212) is provided with a heat-insulating shell on the outside.

8. A thermal circulating distillation system according to claim 1, characterized in that, The outer wall of the cone-shaped outer shell (231) is provided with a cone-shaped heat insulation shell (230), and the pressure tank (11) is wrapped with a heat insulation shell (12).

9. A thermal circulating distillation system according to claim 1, characterized in that, The heater includes an electromagnetic heating coil (16), which is disposed on the outer side wall of the lower part of the pressure tank (11) and is located between the salt outlet (17) and the water inlet pipe (13).

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