Double-layer structure hydrothermal flash evaporation device and method

Abstract

The present invention relates to a double-layer hydrothermal flash evaporation device, comprising an upper flash evaporation tank body, a lower flash evaporation tank body, and a stainless steel interlayer; a feed pipe and an upper steam discharge pipe are provided on the hemispherical top cover on the top of the upper flash evaporation tank body, a feed control valve is provided on the feed pipe, and an upper steam discharge control valve is provided on the upper steam discharge pipe; an upper material feed guide pipe is provided inside the upper flash evaporation tank body; a lower steam discharge pipe is provided on the top of the lower flash evaporation tank body, and a lower steam discharge control valve is provided on the lower steam discharge pipe; the stainless steel interlayer is arranged between the upper flash evaporation tank body and the lower flash evaporation tank body. The beneficial effects of the present invention are: the present invention can flash the high-temperature and high-pressure materials after hydrothermal treatment twice through the double-layer hydrothermal flash evaporation structure, and compared with the ordinary flash evaporation tank, the flash evaporation efficiency is greatly improved through the two explosion effects, so that the conversion efficiency of the difficult-to-degrade organic matter is further improved, and the conversion efficiency and generation of water vapor are increased.

Description

Technical Field

[0001] The invention relates to a double-layer structure hydrothermal flash evaporation device and method, belonging to the technical field of environmental protection energy. Background Art

[0002] Hydrothermal technology refers to the use of high temperature and high pressure conditions in a closed reactor to achieve the transformation of difficult-to-degrade substances. This technology has good application prospects in the treatment of organic waste, including improving the utilization efficiency of organic matter in anaerobic fermentation and increasing the gas production rate, and improving the solid-liquid separation efficiency of organic waste. In the hydrothermal system, the flash evaporation device plays a vital role in the transformation of difficult-to-degrade substances. Flash evaporation refers to the phenomenon that after a high-pressure saturated liquid enters a lower-pressure container, due to the sudden drop in pressure, the high-pressure saturated liquid is converted into saturated water vapor and saturated liquid under the low-pressure container. During the flash evaporation process, the chemical bonds of large-molecule organic matter in the liquid phase will break to generate small-molecule substances, thereby improving the biodegradability of organic matter.

[0003] At present, the traditional flash evaporation device is mainly a hollow tank with basically no internal structure. The hydrothermal material flashes directly in the tank. In comparison, the flash evaporation efficiency is not high, and the "explosion" effect of organic matter is not good, resulting in a relatively low conversion efficiency of difficult-to-degrade organic matter. Moreover, the amount of steam generated after direct flash evaporation is small, and the amount of recycled steam is naturally not much.

[0004] Therefore, in order to increase the gas production of anaerobic digestion of organic matter, the development and design of a high-efficiency flash evaporation device is of great significance to the efficient operation of the hydrothermal system and the effective utilization of organic solid waste. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a double-layer structure hydrothermal flash evaporation device and method.

[0006] The double-layer structure hydrothermal flash evaporation device comprises an upper flash evaporation tank body, a lower flash evaporation tank body and a stainless steel partition.

[0007] A feed pipe and an upper steam discharge pipe are arranged on the hemispherical top cover on the top of the upper flash tank body, a feed control valve is arranged on the feed pipe, and an upper steam discharge control valve is arranged on the upper steam discharge pipe; an upper material feed guide pipe is arranged inside the upper flash tank body, and the upper material feed guide pipe is connected to the feed pipe;

[0008] The top of the lower flash tank is provided with a lower steam discharge pipe, and the lower steam discharge pipe is provided with a lower steam discharge control valve; the lower flash tank is provided with a lower material feed guide pipe connected to the upper flash tank; and the bottom of the lower flash tank is provided with a discharge pipe;

[0009] The stainless steel partition is arranged between the upper flash tank body and the lower flash tank body to isolate the material; the top of the lower material feed guide pipe is fixed in the hole of the stainless steel partition and blocked by an isolation block, and the top of the isolation block is connected to the servo control motor through a high-strength connecting rod.

[0010] Preferably, the upper flash tank body and the lower flash tank body are cylindrical structures, the top cover of the upper flash tank body and the bottom cover of the lower flash tank body are both hemispherical structures, and the bottom of the lower flash tank body is supported by a base.

[0011] As a preference: the upper flash tank and the lower flash tank are provided with an insulation layer outside to reduce heat dissipation and increase the amount of steam generated during the flash evaporation process. The upper flash tank and the lower flash tank are provided with a thermometer 1 and a thermometer 2 respectively.

[0012] Preferably, the wall thickness of the stainless steel interlayer is more than 8 mm, and a stainless steel interlayer support is provided on the inner wall between the upper flash tank body and the lower flash tank body. The stainless steel interlayer is fixed by the stainless steel interlayer support to isolate materials when a large pressure difference is generated between the upper flash tank body and the lower flash tank body to prevent deformation and damage.

[0013] Preferably, the stainless steel partition is circular and has circular holes, and each hole is provided with an isolation block. The isolation block is used to block the holes to prevent the material from falling. A servo control motor is provided on the top of the upper flash tank, and the number of the motors is the same as the number of isolation blocks. Each servo control motor is connected to the isolation block through a high-strength connecting rod. The output shaft of the servo control motor is connected to the high-strength connecting rod through a gear, thereby realizing the vertical movement of the high-strength connecting rod. The purpose of using the servo control motor is to accurately control the lifting and lowering distance of the connecting rod.

[0014] Preferably, the stainless steel interlayer is provided with a hole, a lower material feed guide tube is provided in the hole, the upper end of the lower material feed guide tube is flush with the upper end of the stainless steel interlayer and connected to the isolation block, and the lower material feed guide tube is fixed to the stainless steel interlayer by side bolts. An L-shaped annular graphite sheet is provided on the top and inner wall of the hole, which is flush with the upper top surface of the stainless steel interlayer. After the L-shaped annular graphite sheet is embedded in the hole, it is fixed to the stainless steel interlayer by upper bolts and side bolts.

[0015] Preferably, the connection between the lower steam discharge pipe and the upper flash tank body and the stainless steel interlayer is provided with a seal, and the connection between the feed pipe and the upper steam discharge pipe and the upper flash tank body is provided with a seal to prevent leakage.

[0016] Preferably, the upper flash tank body and the lower flash tank body are both provided with guide plates arranged in an annular manner and inclined upward.

[0017] The working method of the double-layer structure hydrothermal flash evaporation device comprises the following steps:

[0018] S1. When the high-temperature and high-pressure material after hydrothermal treatment enters the bottom of the upper flash tank through the feed pipe under the control of the feed control valve and then through the upper material feed guide pipe, the pressure is instantly released in the upper flash tank to cause the first flash. After the material enters the bottom of the upper flash tank, during the flash process, the pressure is released, so that the material and water vapor move along the guide plate to the wall of the upper flash tank and circulate from the top and then flow back. Finally, the high-temperature material accumulates on the stainless steel interlayer, and the water vapor rises along the inner wall of the upper flash tank through the guide plate, and is finally discharged through the upper steam discharge pipe under the control of the upper steam discharge control valve and reused in the hydrothermal system.

[0019] S2. When the high-temperature material after flashing in the upper flash tank accumulates on the stainless steel interlayer, the system automatically controls the servo control motor, and the servo control motor controls the high-strength connecting rod to lift to a certain distance. At this time, because the pressure of the upper flash tank is greater than that of the lower flash tank, the material enters the lower material feed guide pipe through the holes in the stainless steel interlayer, and then enters the bottom of the lower flash tank, and then the pressure is instantly released at the bottom of the lower flash tank to cause a second flash.

[0020] S3. After the material enters the bottom of the lower flash tank, during the flash process, the pressure is released, causing the material and water vapor to move along the guide plate to the wall of the lower flash tank and circulate from the top and then reflux. Finally, the high-temperature material accumulates on the hemispherical bottom cover of the lower flash tank, and the water vapor rises along the inner wall of the lower flash tank through the guide plate, and is finally discharged through the lower steam discharge pipe under the control of the lower steam discharge control valve and reused in the hydrothermal system.

[0021] Preferably, in step S3, a discharge control valve is provided on the discharge pipe at the bottom of the lower flash tank body. When the material after the second flash evaporation accumulates at the bottom of the lower flash tank body, the discharge control valve is opened to be transported to the subsequent equipment by gravity or by a pump.

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention uses a double-layer hydrothermal flash structure to flash the high-temperature and high-pressure materials after hydrothermal treatment twice. Compared with ordinary flash tanks, the flash efficiency is greatly improved through two explosions, so that the conversion efficiency of difficult-to-degrade organic matter is further improved, and the conversion efficiency and generation of water vapor are increased.

[0024] 2. The guide plate design in the double-layer hydrothermal flash evaporation structure of the present invention can not only improve the flash evaporation efficiency, but also effectively guide the water vapor to facilitate the recovery and utilization of the water vapor.

[0025] 3. The present invention not only effectively realizes the functions of sealing and opening and closing, but also facilitates the installation and removal of wearing parts through designs such as stainless steel partitions, holes, isolation blocks, and L-shaped annular graphite sheets. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of a double-layer hydrothermal flash evaporation device of the present invention;

[0027] Figure 2 This is a plan view of the stainless steel partition used in Example 1 of the present invention;

[0028] Figure 3 This is a plan view of the stainless steel partition used in Example 2 of the present invention;

[0029] Figure 4 This is a plan view of the stainless steel partition used in Example 3 of the present invention;

[0030] Figure 5 Detailed diagram of the isolation block used in the present invention (i.e. Figure 1 (enlarged view of point A in the middle).

[0031] Explanation of the reference numerals in the accompanying drawings: upper flash tank body 1; lower flash tank body 2; stainless steel interlayer 3; feed pipe 4; feed control valve 5; upper steam discharge pipe 6; upper steam discharge control valve 7; lower steam discharge pipe 8; lower steam discharge control valve 9; servo control motor 10; isolation block 11; upper material feed guide pipe 12; lower material feed guide pipe 13; guide plate 14; discharge control valve 15; stainless steel interlayer support 16; sealing member 17; insulation layer 18; L-shaped annular graphite sheet 19; upper bolt 20; side bolt 21; base 22; thermometer one 23; thermometer two 24; discharge pipe 25; high-strength connecting rod 26. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principles of the present invention, several improvements and modifications may be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0033] Embodiment 1

[0034] The first embodiment of the present application provides a double-layer structure hydrothermal flash evaporation device, such as Figure 1As shown, it includes an upper flash tank body 1, a lower flash tank body 2, a stainless steel interlayer 3, a base 22, an insulation layer 18, etc. The double-layer structure hydrothermal flash device is generally cylindrical, and the top cover and the bottom cover are both hemispherical and supported by the base 22. An insulation layer 18 is provided on the outside of the double-layer structure hydrothermal flash device to reduce heat dissipation and increase the amount of steam generated during the flash process. The stainless steel interlayer 3 is arranged between the upper flash tank body 1 and the lower flash tank body 2 to isolate the material. The wall thickness of the stainless steel interlayer 3 is more than 8mm, and a stainless steel interlayer support 16 is provided on the inner wall between the upper flash tank body 1 and the lower flash tank body 2 to isolate the material when a large pressure difference is generated between the upper flash tank body 1 and the lower flash tank body 2 to prevent deformation and damage. A guide plate 14 is provided in both the upper flash tank body 1 and the lower flash tank body 2 to guide the material and water vapor.

[0035] A feed pipe 4 and an upper steam discharge pipe 6 are provided on the hemispherical top cover at the top of the upper flash tank body 1. A feed control valve 5 is provided on the feed pipe 4. An upper steam discharge control valve 7 is provided on the upper steam discharge pipe 6. A seal 17 is provided at the connection between the feed pipe 4, the upper steam discharge pipe 6 and the upper flash tank body 1 to prevent leakage. When the high-temperature and high-pressure material after hydrothermal treatment passes through the feed pipe 4 and then through the upper material feed guide pipe 12 under the control of the feed control valve 5, it enters the bottom of the upper flash tank body 1, and the pressure is instantly released in the upper flash tank body 1 to flash. After the first flash, most of the material with a hydrothermal temperature of 130-220°C (0.27-2.35MPa) instantly drops to 120-160°C (0.2-0.6MPa), and the water in a small part of the material is vaporized into water vapor. The upper flash tank body 1 is provided with a guide plate 14 which is arranged in an annular manner and inclined upward. After the material enters the bottom of the upper flash tank body 1, during the flash process, the pressure is released, so that the material and water vapor move along the guide plate 14 to the wall of the upper flash tank body 1 and circulate from the top and then reflux. Finally, the high-temperature material accumulates on the stainless steel interlayer 3, and the water vapor rises along the inner wall through the guide plate 14, and is finally discharged through the upper steam discharge pipe 6 under the control of the upper steam discharge control valve 7 and reused in the hydrothermal system.

[0036] The stainless steel partition 3 is circular and has circular holes, and each hole is provided with an isolation block 11. The function of the isolation block 11 is to block the hole to prevent the material from falling. A servo control motor 10 is provided on the top of the upper flash tank body 1, and the number of the servo control motors 10 is the same as the number of the isolation blocks 11. Each servo control motor 10 is connected to the isolation block 11 through a high-strength connecting rod 26. When the material is flashed in the upper flash tank body 1, the servo control motor 10 automatically operates, and the isolation block 11 is lifted a certain distance through the high-strength connecting rod 26, so that the material flows out along the hole below the isolation block 11 under the pressure difference between the upper flash tank body 1 and the lower flash tank body 2 and the action of gravity.

[0037] like Figure 2 As shown, in Example 1, two isolation blocks 11 are provided, arranged on a center line and arranged symmetrically. Figure 3 As shown, in Example 2, there is one isolation block 11, which is arranged in the center of the stainless steel barrier 3, and the area of ​​the hole and the isolation block 11 are larger than those in Example 1. Figure 4 As shown, in Example 3, there are four isolation blocks 11, which are arranged on two center lines in a symmetrical arrangement, and the area of ​​each hole and isolation block 11 is smaller than that of Example 1.

[0038] like Figure 5 As shown, a hole is provided on the stainless steel interlayer 3, and the hole is cylindrical, in which a lower material feed guide tube 13 is provided, and the upper end of the lower material feed guide tube 13 is flush with the upper end of the stainless steel interlayer 3 and connected to the isolation block 11, and the lower material feed guide tube 13 is fixed to the stainless steel interlayer 3 by side bolts 21. An L-shaped annular graphite sheet 19 is provided on the top and inner wall of the hole, which is flush with the upper top surface of the stainless steel interlayer 3. After the L-shaped annular graphite sheet 19 is embedded in the hole, it is fixed to the stainless steel interlayer 3 by upper bolts 20 and side bolts 21. Each L-shaped annular graphite sheet 19 is provided with 4 upper bolts 20 and side bolts 21 to improve the fixing strength. The upper bolts 20 and side bolts 21 are made of 316L stainless steel. The diameter of the isolation block 11 is smaller than the L-shaped annular graphite sheet 19, and is also smaller than the diameter of the circumferential arrangement of the upper bolts 20, so as to facilitate seamless compression and isolation. The L-shaped annular graphite sheet 19 has a smaller friction coefficient and a stronger anti-leakage ability. Under the control of the servo control motor 10, the isolation block 11 is pressed against the L-shaped annular graphite sheet 19, which completely isolates the upper flash tank body 1 and the lower flash tank body 2 and prevents liquid and gas leakage. At the same time, there will not be a large viscosity when lifting.

[0039] The installation sequence of the structure is as follows: first, insert the L-shaped annular graphite sheet 19 into the stainless steel interlayer 3, and tighten the upper bolts 20 arranged circumferentially; then insert the lower material feed guide tube 13, and tighten the side bolts 21 arranged circumferentially from the top; then press the isolation block 11 through the high-strength connecting rod 26 of the servo control motor 10. When the graphite sheet needs to be replaced, the reverse operation is performed.

[0040] The lower flash tank body 2 is provided with a lower steam discharge pipe 8, a lower material feed guide pipe 13, a guide plate 14, and a discharge pipe 25. The lower steam discharge pipe 8 is provided with a lower steam discharge control valve 9, and the connection between the lower steam discharge pipe 8 and the upper flash tank body 1 and the stainless steel barrier 3 is provided with a seal 17 to prevent leakage. When the high-temperature material after flashing in the upper flash tank body 1 accumulates on the stainless steel interlayer 3, the system automatically controls the servo control motor 10 and controls the high-strength connecting rod 26 to lift to a certain distance. At this time, because the pressure of the upper flash tank body 1 is greater than that of the lower flash tank body 2, the material enters the lower material feed guide pipe 13 through the holes on the stainless steel interlayer 3 and enters the bottom of the lower flash tank body 2. Then, the pressure is instantly released at the bottom of the lower flash tank body 2 to cause a second flash. The temperature of most of the materials instantly drops from 120-160℃ (0.2-0.6MPa) to 95-99℃, and the water in a small part of the materials is vaporized into water vapor. The lower flash tank body 2 is provided with a guide plate 14 arranged in an annular manner and tilted upward. After the material enters the bottom of the lower flash tank body 2, during the flash process, the pressure is released, so that the material and water vapor move along the guide plate 14 to the wall of the lower flash tank body 2 and circulate from the top and then flow back. Finally, the high-temperature material accumulates on the semicircular bottom cover of the lower flash tank body 2, and the water vapor rises along the inner wall through the guide plate 14, and is finally discharged through the lower steam discharge pipe 8 under the control of the lower steam discharge control valve 9 and reused in the hydrothermal system. The discharge pipe 25 is provided with a discharge control valve 15. When the material after the second flash is accumulated on the bottom cover of the lower flash tank body 2, it is transported to the subsequent equipment by gravity or by a pump by opening the discharge control valve 15.

[0041] Embodiment 2

[0042] Embodiment 2 of the present application provides a working method of a double-layer structure hydrothermal flash evaporation device, comprising the following steps:

[0043] S1. When the high-temperature and high-pressure material after hydrothermal treatment enters the bottom of the upper flash tank body 1 through the feed pipe 4 and the upper material feed guide pipe 12 under the control of the feed control valve 5, the pressure is instantly released in the upper flash tank body 1 to cause the first flash. After the material enters the bottom of the upper flash tank body 1, during the flash process, the pressure is released, so that the material and water vapor move along the guide plate 14 to the wall of the upper flash tank body 1 and circulate from the top and then reflux, and finally the high-temperature material accumulates on the stainless steel interlayer 3, and the water vapor rises along the inner wall of the upper flash tank body 1 through the guide plate 14, and is finally discharged through the upper steam discharge pipe 6 under the control of the upper steam discharge control valve 7, and reused in the hydrothermal system.

[0044] S2. When the high-temperature material after flashing in the upper flash tank body 1 accumulates on the stainless steel interlayer 3, the system automatically controls the servo control motor 10, and the servo control motor 10 controls the high-strength connecting rod 26 to lift to a certain distance. At this time, because the pressure of the upper flash tank body 1 is greater than that of the lower flash tank body 2, the material enters the lower material feed guide pipe 13 through the holes on the stainless steel interlayer 3, and then enters the bottom of the lower flash tank body 2, and then the pressure is instantly released at the bottom of the lower flash tank body 2 to cause a second flash.

[0045] S3. After the material enters the bottom of the lower flash tank body 2, during the flash process, the pressure is released, so that the material and water vapor move along the guide plate 14 to the wall of the lower flash tank body 2 and circulate from the top and then reflux. The high-temperature material accumulates on the hemispherical bottom cover of the lower flash tank body 2 and is transported to the subsequent equipment by gravity or by a pump by opening the discharge control valve 15. The water vapor rises along the inner wall of the lower flash tank body 2 through the guide plate 14 and is finally discharged through the lower steam discharge pipe 8 under the control of the lower steam discharge control valve 9 and reused in the hydrothermal system.

[0046] The present invention gradually releases the material from a high temperature and high pressure state to a normal pressure state through flash evaporation, and under the action of explosion, macromolecular organic matter is converted into small molecular organic matter, thereby making the organic matter degradable. The present invention further improves the conversion of difficult-to-degrade organic matter in anaerobic digestion residue through secondary flash evaporation and two explosions, and improves the recycling of residual steam through reasonable structural design.

Claims

1. A double-layer hydrothermal flash evaporation device, characterized in that: It comprises an upper flash tank body (1), a lower flash tank body (2) and a stainless steel barrier (3); A feed pipe (4) and an upper steam discharge pipe (6) are provided on the hemispherical top cover on the top of the upper flash tank body (1); a feed control valve (5) is provided on the feed pipe (4); and an upper steam discharge control valve (7) is provided on the upper steam discharge pipe (6); an upper material feed guide pipe (12) is provided inside the upper flash tank body (1); and the upper material feed guide pipe (12) is connected to the feed pipe (4); The top of the lower flash tank body (2) is provided with a lower steam discharge pipe (8), and the lower steam discharge pipe (8) is provided with a lower steam discharge control valve (9); a lower material feed guide pipe (13) communicating with the upper flash tank body (1) is provided in the lower flash tank body (2); and a discharge pipe (25) is provided at the bottom of the lower flash tank body (2); The stainless steel barrier (3) is arranged between the upper flash tank body (1) and the lower flash tank body (2); the top end of the lower material feed guide pipe (13) is fixed in the hole of the stainless steel barrier (3) and blocked by an isolation block (11); the top of the isolation block (11) is connected to the servo control motor (10) via a high-strength connecting rod (26).

2. The double-layer hydrothermal flash evaporation device according to claim 1 is characterized in that: The upper flash tank body (1) and the lower flash tank body (2) are cylindrical structures, the top cover of the upper flash tank body (1) and the bottom cover of the lower flash tank body (2) are both hemispherical structures, and the bottom of the lower flash tank body (2) is supported by a base (22).

3. The double-layer hydrothermal flash evaporation device according to claim 1 is characterized in that: The upper flash tank body (1) and the lower flash tank body (2) are provided with a heat-insulating layer (18) on the outside; the upper flash tank body (1) and the lower flash tank body (2) are provided with a thermometer 1 (23) and a thermometer 2 (24) respectively.

4. The double-layer hydrothermal flash evaporation device according to claim 1 is characterized in that: The thickness of the stainless steel interlayer (3) is greater than 8 mm, and a stainless steel interlayer support (16) is provided on the inner wall between the upper flash tank body (1) and the lower flash tank body (2), and the stainless steel interlayer (3) is fixed by the stainless steel interlayer support (16).

5. The double-layer hydrothermal flash evaporation device according to claim 1 is characterized in that: The stainless steel partition (3) is circular and is provided with circular holes, and each hole is provided with an isolation block (11); the top of the upper flash tank body (1) is provided with servo control motors (10), the number of which is the same as the number of isolation blocks (11), and each servo control motor (10) is connected to the isolation block (11) via a high-strength connecting rod (26).

6. The double-layer hydrothermal flash evaporation device according to claim 1 is characterized in that: A lower material feed guide tube (13) is provided in the hole of the stainless steel interlayer (3), the upper end of the lower material feed guide tube (13) is flush with the upper end of the stainless steel interlayer (3), and the upper end of the lower material feed guide tube (13) is connected to the isolation block (11), and the lower material feed guide tube (13) is fixed to the stainless steel interlayer (3) by side bolts (21); an L-shaped circular graphite sheet (19) is provided at the top and inner wall of the hole, and is flush with the upper top surface of the stainless steel interlayer (3), and the L-shaped circular graphite sheet (19) is fixed to the stainless steel interlayer (3) by upper bolts (20) and side bolts (21).

7. The double-layer hydrothermal flash evaporation device according to claim 1 is characterized in that: The connection between the lower steam discharge pipe (8) and the upper flash tank body (1) and the stainless steel barrier (3) is provided with a seal (17), and the connection between the feed pipe (4) and the upper steam discharge pipe (6) and the upper flash tank body (1) is provided with a seal (17).

8. The double-layer hydrothermal flash evaporation device according to claim 1 is characterized in that: The upper flash tank body (1) and the lower flash tank body (2) are both provided with guide plates (14) arranged in an annular manner and inclined upward.

9. A working method of the double-layer hydrothermal flash evaporation device according to claim 1, characterized in that: The following steps are involved: S1, when the high-temperature and high-pressure material after hydrothermal treatment enters the bottom of the upper flash tank body (1) through the feed pipe (4) and then through the upper material feed guide pipe (12) under the control of the feed control valve (5), the pressure is released in the upper flash tank body (1) to cause the first flash evaporation; after the material enters the bottom of the upper flash tank body (1), during the flash evaporation process, the pressure is released, so that the material and water vapor move along the guide plate (14) to the wall of the upper flash tank body (1) and circulate from the top and then flow back, and finally the high-temperature material accumulates on the stainless steel interlayer (3), and the water vapor rises along the inner wall of the upper flash tank body (1) through the guide plate (14), and is finally discharged through the upper steam discharge pipe (6) under the control of the upper steam discharge control valve (7); S2, when the high-temperature material after flash evaporation in the upper flash tank body (1) accumulates on the stainless steel interlayer (3), the servo control motor (10) controls the high-strength connecting rod (26) to be lifted to a certain distance, at which time the pressure of the upper flash tank body (1) is greater than that of the lower flash tank body (2), and the material enters the lower material feed guide pipe (13) through the holes on the stainless steel interlayer (3), and then enters the bottom of the lower flash tank body (2), and then the pressure is released at the bottom of the lower flash tank body (2) to cause a second flash evaporation; S3. After the material enters the bottom of the lower flash tank body (2), during the flash process, the pressure is released, causing the material and water vapor to move along the guide plate (14) to the wall of the lower flash tank body (2) and circulate from the top and then flow back. Finally, the high-temperature material accumulates on the hemispherical bottom cover of the lower flash tank body (2), and the water vapor rises along the inner wall of the lower flash tank body (2) through the guide plate (14) and is finally discharged through the lower steam discharge pipe (8) under the control of the lower steam discharge control valve (9).

10. The working method of the double-layer structure hydrothermal flash evaporation device according to claim 9, characterized in that: In step S3, a discharge control valve (15) is provided on the discharge pipe (25) at the bottom of the lower flash tank (2). When the material after the second flash evaporation accumulates at the bottom of the lower flash tank (2), the discharge control valve (15) is opened to be transported to the subsequent equipment by gravity or by a pump.

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