A combined condensing system

Abstract

The present invention discloses a combined condensation system, including a front-end condensation module and a rear-end condensation module, wherein the front-end condensation module is a plate heat exchanger and / or a spiral heat exchanger, and the rear-end condensation module is a 3D deep condensation module; a heat medium end of the front-end condensation module is connected to a high-temperature fluid pipeline; the other heat medium end of the front-end condensation module is connected to a heat medium end of the rear-end condensation module; a heat medium end of the rear-end condensation module is an external discharge end; the two heat exchange ends of the front-end condensation module are connected to a first heat recovery system; the two heat exchange ends of the rear-end condensation module are connected to a second heat recovery system. The combined condensation system of the present invention adopts the front-end condensation module to recover high calorific value heat, and performs three-dimensional sheathing circulation heat exchange on the fluid with low calorific value through the 3D deep condensation module, so as to realize the recovery of low calorific value heat of the fluid or fully cool the low calorific value fluid, so as to meet the low temperature requirement of the fluid being reused in the production line.

Description

Technical Field

[0001] The invention relates to a condensation system, in particular to a combined condensation system, and belongs to the technical field of condensation systems. Background Art

[0002] In industrial production, a large amount of energy is often consumed. When this energy is invested in production, while meeting the production needs, it often causes the discharge of high-temperature gas, liquid or gas-liquid mixture. Therefore, it is often necessary to cool the hot gas generated in the production first, and recover part of the heat during cooling. After the gas and liquid are condensed, they are put back into production. In the prior art, during condensation, cooling towers or heat exchangers are directly used for condensation and heat exchange. The condensation is not thorough enough, and a certain amount of heat still exists after the gas and liquid are discharged. At this time, if the gas and liquid carrying a certain amount of heat are directly put back into production, it is easy to cause incomplete condensation, resulting in reduced production efficiency. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a combined condensation system, which adopts a front-end condensation module to recover high calorific value heat, and uses a 3D deep condensation module to perform three-dimensional wrapping circulation heat exchange on low calorific value fluid, thereby realizing the recovery of low calorific value heat of the fluid or sufficient cooling of the low calorific value fluid to meet the low temperature requirements of the fluid for reuse in the production line.

[0004] The combined condensation system of the present invention comprises a front-end condensation module and a rear-end condensation module, wherein the front-end condensation module is a plate heat exchanger and / or a spiral heat exchanger, and the rear-end condensation module is a 3D deep condensation module; a heat medium end of the front-end condensation module is connected to a high-temperature fluid pipeline; the other heat medium end of the front-end condensation module is connected to a heat medium end of the rear-end condensation module; a heat medium end of the rear-end condensation module is an external discharge end; the two heat exchange ends of the front-end condensation module are connected to a first heat recovery system; and the two heat exchange ends of the rear-end condensation module are connected to a second heat recovery system.

[0005] Furthermore, the 3D deep condensation module includes

[0006] Circular heat exchange plate,

[0007] Spiral heat exchange thin plates, the spiral heat exchange thin plates are provided with two groups, the two groups of spiral heat exchange thin plates are respectively welded to the two sides of the circular heat exchange thin plates; the shortest spiral distance and the longest spiral distance of the spiral heat exchange thin plates are respectively consistent with the shortest distance and the longest distance of the inner edge of the spiral heat exchange thin plates; the circular heat exchange thin plates are provided with a first inner water inlet hole near the center; the inner end of the spiral heat exchange thin plates is closed and connected with the first inner water inlet hole; the outer end of the spiral heat exchange thin plates is closed and provided with a second outer water inlet hole; the transverse cross section of the spiral heat exchange thin plates is an isosceles trapezoidal cavity structure with a hollow bottom surface; right-angle platforms for welding are pressed on both sides of the bottom of the spiral heat exchange thin plates;

[0008] Spiral thin plate; the spiral thin plate is arranged between the spirals of the spiral heat exchange thin plate; and the spiral edge of the spiral thin plate is pressed onto the right angle platform; the spiral thin plate and the right angle platform are welded as a whole, and the top surface of the spiral thin plate is flush with the top surface of the spiral heat exchange thin plate;

[0009] The circular heat exchange thin plate is provided with a second inner water inlet hole near the center; the inner end of the spiral thin plate is sealed with the spiral end of the spiral heat exchange thin plate and is connected with the second inner water inlet hole; the outer end of the spiral thin plate is sealed with the spiral end of the spiral heat exchange thin plate and is provided with a second outer water inlet hole;

[0010] The center points and pitches of the two groups of spiral heat exchange thin plates are consistent, and the spiral heat exchange thin plates on the bottom surface have at least two more spiral segments than the spiral heat exchange thin plates on the top surface;

[0011] The two first inner water inlet holes are connected, the two second inner water inlet holes are connected, the first outer water inlet hole on the bottom surface is the heat medium input end; the first outer water inlet hole on the top surface is the heat medium output end; the second outer water inlet hole on the bottom surface is the heat exchange output end; the second outer water inlet hole on the top surface is the heat exchange input end;

[0012] Thermal insulation jacket; the thermal insulation jacket comprises a thermal insulation layer covering the outside of the spiral heat exchange thin plate, the spiral thin plate and the circular heat exchange thin plate; a protective shell is arranged outside the thermal insulation layer.

[0013] Furthermore, after the circular heat exchange plate is welded to each spiral heat exchange plate, a sealed water-tightening and pressurizing test is required. During the test, the first inner water inlet hole or the first outer water inlet hole is first closed, and then the other end is pressurized to a predetermined value to determine whether there is leakage. After the test, the spiral plate is welded, and a sealed water-tightening and pressurizing test is performed on both ends of the spiral plate. Finally, the 3D deep condensation module is tested as a whole. During the test, two liquids are respectively subjected to a sealed water-tightening and pressurizing test in the channels of the spiral heat exchange plate and the spiral plate. After the experiment, the concentration of the two liquids is tested. When the concentration is within the threshold range, the test is passed. When the concentration exceeds the set threshold, it is determined that a leakage point exists. One of the two liquids is clean water, and the other is a colored liquid, alcohol or chemical reagent.

[0014] Furthermore, a water guide nozzle is welded on the inner side of the first inner water guide hole of the circular heat exchange plate; the water guide nozzle is a direct drainage structure or a one-way valve structure.

[0015] Furthermore, it also includes a short outer diameter 3D deep condensation module; the short outer diameter 3D deep condensation module includes multiple groups of spiral heat exchange plates, circular heat exchange plates and spiral plates, and welding and sealing experiments are carried out according to the manufacturing method of the 3D deep condensation module; the outer diameter of the spiral heat exchange plates of the short outer diameter 3D deep condensation module is consistent with the outer diameter of the spiral heat exchange plates on the top surface of the 3D deep condensation module, the short outer diameter 3D deep condensation module is fixed to the top surface of the 3D deep condensation module to form a convex condensation module, and the channels of adjacent layers of spiral heat exchange plates are internally connected or externally connected.

[0016] Furthermore, the 3D deep condensation modules or convex condensation modules are provided in multiple groups and are connected in parallel to form a condensation module.

[0017] Furthermore, the second heat recovery system is a low calorific value direct recycling circulation pipeline; or a circulation pipeline connected in series with a refrigeration module; or a secondary circulation pipeline connected in series with a compressor and a condenser, and the low boiling point medium to be heated is injected into the secondary circulation pipeline; the circulation pipeline is selected according to the use scenario, when the use scenario requires low calorific value, the low calorific value direct recycling circulation pipeline is used, when the use scenario requires low calorific value, the secondary circulation pipeline is used, when the use scenario requires low calorific value, when the use scenario requires low calorific value, when the secondary circulation pipeline is used, when the heat medium needs to be fully condensed and reused, the circulation pipeline of the refrigeration module is used for in-depth cooling and reuse.

[0018] Furthermore, the high-temperature fluid pipeline injects high-calorie fluid into the heat medium end on the input side of the front-end condensing module, and recovers most of the heat through the first heat recovery system. The heat medium end on the output side of the front-end condensing module exports the low-grade heat fluid and sends it to the heat medium input end of the rear-end condensing module. The second heat recovery system of the rear-end condensing module performs secondary heat exchange to recover the heat. During the secondary heat exchange, a 3D deep condensation module is used, and the hot medium and the cold medium adopt a three-dimensional encapsulated circulation heat exchange, so as to fully absorb the low-grade heat fluid.

[0019] Furthermore, the working process of the 3D deep condensation module is as follows: the circular heat exchange plate, the spiral heat exchange plate and the spiral plate form two sets of parallel spiral circulation channels on the top and bottom surfaces of the circular heat exchange plate respectively, and the low-grade heat fluid flows in from the bottom circulation channel and flows out from the top circulation channel, and the cold medium flows in from the top circulation channel and flows out from the bottom circulation channel. Since the outer diameter of the bottom circulation channel is larger than the outer diameter of the top circulation channel; the low-grade heat fluid in the spiral section of the circulation channel protruding from the top surface does not need to exchange heat with the circulation channel on the top layer. Therefore, when the cold medium flows out, it is heated by the low-grade heat fluid in the circulation channel on the adjacent side to a temperature close to the low-grade heat fluid temperature, ensuring that the output side reaches the highest temperature; the cold medium flows out from the top When the cold medium enters the 3D deep condensation module, the cold medium adopts 3D heat exchange, that is, the upper and lower surfaces and the two sides are synchronously heated in a three-dimensional manner by wrapping the cold medium. The hot medium is three-dimensionally wrapped around the cold medium to fully and deeply exchange heat. Finally, after directly outputting heat exchange through the flow channel on the output side, the output is close to the temperature of the low-grade thermal fluid. When it is necessary to enter deep condensation, a convex condensation module is used with a convex structure to perform multi-layer heat exchange before output to ensure that the cold medium reaching the output side fully absorbs heat. The bottom flow channel is larger than the upper flow channel, and the cold medium on the output side is in direct contact with the hottest end to ensure that the heating product outputs the highest calorific value and avoids heat loss. That is, at the same time, when the flow is introduced, the bottom volume is larger than the top volume, so that the heat supply flow of the hot medium is stable.

[0020] Compared with the prior art, the combined condensation system of the present invention adopts a front-end condensation module to recover high calorific value heat, and uses a 3D deep condensation module to perform three-dimensional wrapping circulation heat exchange on low calorific value fluids, thereby realizing the recovery of low calorific value heat of the fluid or sufficient cooling of the low calorific value fluid, meeting the low-temperature requirements of the fluid for reuse in the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The overall structure diagram of the combined condensation system of the present invention is

[0022] Figure 2 It is a schematic diagram of the circular heat exchange plate, the spiral heat exchange plate and the spiral plate welding structure of the present invention.

[0023] Figure 3 It is a schematic diagram of the spiral heat exchange sheet and the spiral sheet welding three-dimensional structure of the present invention.

[0024] Figure 4 It is a schematic diagram of the welding structure of the circular heat exchange plate and the spiral heat exchange plate of the present invention.

[0025] Figure 5 It is a schematic diagram of the structure of the 3D deep condensation module of the present invention.

[0026] Figure 6It is a schematic diagram of the structure of the convex condensation module of the present invention.

[0027] Figure 7 This is a schematic diagram of two groups of 3D deep condensation modules connected in parallel according to the present invention.

[0028] Figure 8 It is a schematic diagram of two groups of convex condensation modules connected in parallel according to the present invention. DETAILED DESCRIPTION

[0029] Embodiment 1:

[0030] like Figures 1 to 5 The combined condensation system shown includes a front-end condensation module 1 and a rear-end condensation module 2, wherein the front-end condensation module 1 is a plate heat exchanger and / or a spiral heat exchanger, and the rear-end condensation module 2 is a 3D deep condensation module; one heat medium end of the front-end condensation module 1 is connected to a high-temperature fluid pipeline 3; the other heat medium end of the front-end condensation module 1 is connected to a heat medium end of the rear-end condensation module 2; one heat medium end of the rear-end condensation module 2 is an external discharge end; the two heat exchange ends of the front-end condensation module 1 are connected to a first heat recovery system 4; the two heat exchange ends of the rear-end condensation module 2 are connected to a second heat recovery system 5.

[0031] The 3D deep condensation module includes

[0032] Circular heat exchange plate 6,

[0033] Spiral heat exchange thin plates 7, wherein two groups of spiral heat exchange thin plates 7 are provided, and the two groups of spiral heat exchange thin plates 7 are respectively welded to the two sides of the circular heat exchange thin plates 6; the shortest spiral distance and the longest spiral distance of the spiral heat exchange thin plates 7 are respectively consistent with the shortest distance and the longest distance of the inner edge of the spiral heat exchange thin plates 6; the circular heat exchange thin plates 6 are provided with a first inner water diversion hole 61 near the center; the inner end of the spiral heat exchange thin plates 7 is closed and communicated with the first inner water diversion hole 61; the outer end of the spiral heat exchange thin plates 7 is closed and provided with a second outer water diversion hole 62; the transverse cross section of the spiral heat exchange thin plates 7 is an isosceles trapezoidal cavity structure with a hollow bottom surface; right-angle platforms 71 for welding are pressed on both sides of the upper bottom of the spiral heat exchange thin plates 6;

[0034] Spiral thin plate 8; the spiral thin plate 8 is arranged between the spirals of the spiral heat exchange thin plate 6; and the spiral edge of the spiral thin plate is pressed onto the right angle platform 71; the spiral thin plate 8 and the right angle platform 71 are welded as a whole, and the top surface of the spiral thin plate 8 is flush with the top surface of the spiral heat exchange thin plate 7;

[0035] The circular heat exchange thin plate 6 is provided with a second inner water inlet hole 63 near the center; the inner end of the spiral thin plate 8 is sealed with the spiral end of the spiral heat exchange thin plate 7 and is connected with the second inner water inlet hole 63; the outer end of the spiral thin plate 8 is sealed with the spiral end of the spiral heat exchange thin plate 7 and is provided with a second outer water inlet hole 64;

[0036] The center points and pitches of the two groups of spiral heat exchange thin plates 7 are consistent, and the spiral heat exchange thin plates 7 on the bottom surface have at least two more spiral segments than the spiral heat exchange thin plates 7 on the top surface;

[0037] The two first inner water inlet holes 61 are connected, the two second inner water inlet holes 63 are connected, the first outer water inlet hole 62 on the bottom is the heat medium input end; the first outer water inlet hole 62 on the top is the heat medium output end; the second outer water inlet hole 64 on the bottom is the heat exchange output end; the second outer water inlet hole 64 on the top is the heat exchange input end;

[0038] The thermal insulation jacket 9 comprises a thermal insulation layer 91 covering the outside of the spiral heat exchange thin plate, the spiral thin plate and the circular heat exchange thin plate; a protective shell 92 is arranged outside the thermal insulation layer.

[0039] After the circular heat exchange plate 6 is welded to each spiral heat exchange plate 7, a sealed water-tightening and pressurizing test is required. During the test, the first inner water inlet hole or the first outer water inlet hole is first closed, and then the other end is pressurized to a predetermined value to determine whether there is leakage. After the test is passed, the spiral plates are welded, and the two ends of the spiral plates are subjected to a sealed water-tightening and pressurizing test. Finally, the 3D deep condensation module is tested as a whole. During the test, two liquids are respectively subjected to a sealed water-tightening and pressurizing test in the channels of the spiral heat exchange plates and the spiral plates. After the experiment, the concentration of the two liquids is tested. When the concentration is within the threshold range, the test is passed. When the concentration exceeds the set threshold, it is determined that a leakage point exists. One of the two liquids is clean water, and the other is a colored liquid, alcohol or chemical reagent.

[0040] The circular heat exchange plate 6 is welded with a water guide nozzle 10 on the inner side of the first inner water guide hole; the water guide nozzle 10 is a direct drainage structure or a one-way valve structure.

[0041] Embodiment 2:

[0042] like Figure 6 The combined condensation system shown also includes a short outer diameter 3D deep condensation module; the short outer diameter 3D deep condensation module includes multiple groups of spiral heat exchange plates 7, circular heat exchange plates 6 and spiral plates 8, and welding and sealing experiments are carried out according to the manufacturing method of the 3D deep condensation module; the outer diameter of the spiral heat exchange plate 7 of the short outer diameter 3D deep condensation module is consistent with the outer diameter of the spiral heat exchange plate 7 on the top surface of the 3D deep condensation module, the short outer diameter 3D deep condensation module is fixed to the top surface of the 3D deep condensation module to form a convex condensation module, and the channels of adjacent layers of spiral heat exchange plates are internally connected or externally connected.

[0043] Embodiment 3:

[0044] like Figure 7 and Figure 8In the combined condensation system shown, the 3D deep condensation modules or convex condensation modules are provided in multiple groups and connected in parallel to form a condensation module.

[0045] The second heat recovery system 5 is a low calorific value direct recycling circulation pipeline; or a circulation pipeline connected in series with a refrigeration module; or a secondary circulation pipeline connected in series with a compressor and a condenser, and the low boiling point medium to be heated is injected into the secondary circulation pipeline; the circulation pipeline is selected according to the use occasion. When the use occasion requires low calorific value, the low calorific value direct recycling circulation pipeline is adopted. When the use occasion requires low calorific value, the secondary circulation pipeline is adopted. When the use occasion requires low calorific value, the circulation pipeline of the refrigeration module is adopted for deep cooling and recycling.

[0046] The high-temperature fluid pipeline injects high-calorie fluid into the heat medium end on the input side of the front-end condensing module, and recovers most of the heat through the first heat recovery system. The heat medium end on the output side of the front-end condensing module exports the low-grade heat fluid and sends it to the heat medium input end of the rear-end condensing module. The second heat recovery system of the rear-end condensing module performs secondary heat exchange to recover the heat. During the secondary heat exchange, a 3D deep condensation module is used, and the hot medium and the cold medium adopt a three-dimensional encapsulated circulation heat exchange, so as to fully absorb the low-grade heat fluid.

[0047] The working process of the 3D deep condensation module is as follows: the circular heat exchange plate, the spiral heat exchange plate and the spiral plate form two sets of parallel spiral circulation channels on the top and bottom surfaces of the circular heat exchange plate respectively. The low-grade heat fluid flows in from the bottom circulation channel and flows out from the top circulation channel, and the cold medium flows in from the top circulation channel and flows out from the bottom circulation channel. Since the outer diameter of the bottom circulation channel is larger than the outer diameter of the top circulation channel; the low-grade heat fluid in the spiral section of the circulation channel protruding from the top surface does not need to exchange heat with the circulation channel on the top layer. Therefore, when the cold medium flows out, it is heated by the low-grade heat fluid in the circulation channel on the adjacent side to a temperature close to the low-grade heat fluid temperature, ensuring that the output side reaches the highest temperature; the cold medium enters from the top surface When it reaches the 3D deep condensation module, the cold medium adopts 3D heat exchange, that is, the upper and lower sides and the two sides are synchronously heated in a three-dimensional manner by wrapping the cold medium. The hot medium is three-dimensionally wrapped around the cold medium to fully and deeply exchange heat. Finally, after directly outputting heat exchange through the flow channel on the output side, the output is close to the temperature of the low-grade thermal fluid. When it is necessary to enter deep condensation, a convex condensation module is used with a convex structure to perform multi-layer heat exchange before output to ensure that the cold medium reaching the output side fully absorbs heat, and the bottom flow channel is larger than the upper flow channel. The cold medium on the output side is in direct contact with the hottest end to ensure that the heating product outputs the highest calorific value and avoids heat loss. That is, at the same time, when the flow is introduced, the bottom volume is larger than the top volume, so that the heat supply flow of the hot medium is stable.

[0048] The above embodiments are only preferred implementations of the present invention, so all equivalent changes or modifications made according to the structures, features and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A combined condensation system, characterized in that: It includes a front-end condensation module and a rear-end condensation module, wherein the front-end condensation module is a plate heat exchanger and / or a spiral heat exchanger, and the rear-end condensation module is a 3D deep condensation module; a heat medium end of the front-end condensation module is connected to a high-temperature fluid pipeline; the other heat medium end of the front-end condensation module is connected to a heat medium end of the rear-end condensation module; a heat medium end of the rear-end condensation module is an external discharge end; two heat exchange ends of the front-end condensation module are connected to a first heat recovery system; and two heat exchange ends of the rear-end condensation module are connected to a second heat recovery system; The 3D deep condensation module includes Circular heat exchange plate, Spiral heat exchange thin plates, the spiral heat exchange thin plates are provided with two groups, the two groups of spiral heat exchange thin plates are respectively welded to the two sides of the circular heat exchange thin plates; the shortest spiral distance and the longest spiral distance of the spiral heat exchange thin plates are respectively consistent with the shortest distance and the longest distance of the inner edge of the spiral heat exchange thin plates; the circular heat exchange thin plates are provided with a first inner water inlet hole near the center; the inner end of the spiral heat exchange thin plates is closed and connected with the first inner water inlet hole; the outer end of the spiral heat exchange thin plates is closed and provided with a second outer water inlet hole; the transverse cross section of the spiral heat exchange thin plates is an isosceles trapezoidal cavity structure with a hollow bottom surface; right-angle platforms for welding are pressed on both sides of the bottom of the spiral heat exchange thin plates; Spiral thin plate; the spiral thin plate is arranged between the spirals of the spiral heat exchange thin plate; and the spiral edge of the spiral thin plate is pressed onto the right angle platform; the spiral thin plate and the right angle platform are welded as a whole, and the top surface of the spiral thin plate is flush with the top surface of the spiral heat exchange thin plate; The circular heat exchange thin plate is provided with a second inner water inlet hole near the center; the inner end of the spiral thin plate is sealed with the spiral end of the spiral heat exchange thin plate and is connected with the second inner water inlet hole; the outer end of the spiral thin plate is sealed with the spiral end of the spiral heat exchange thin plate and is provided with a second outer water inlet hole; The center points and pitches of the two groups of spiral heat exchange thin plates are consistent, and the spiral heat exchange thin plates on the bottom surface have at least two more spiral segments than the spiral heat exchange thin plates on the top surface; The two first inner water inlet holes are connected, the two second inner water inlet holes are connected, the first outer water inlet hole on the bottom surface is the heat medium input end; the first outer water inlet hole on the top surface is the heat medium output end; the second outer water inlet hole on the bottom surface is the heat exchange output end; the second outer water inlet hole on the top surface is the heat exchange input end; Thermal insulation jacket; the thermal insulation jacket comprises a thermal insulation layer covering the outside of the spiral heat exchange thin plate, the spiral thin plate and the circular heat exchange thin plate; a protective shell is arranged outside the thermal insulation layer.

2. The combined condensation system according to claim 1, characterized in that: After the circular heat exchange plate is welded to each spiral heat exchange plate, a sealed water-tightening and pressurizing test is required. During the test, the first inner water inlet hole or the first outer water inlet hole is first closed, and then the other end is pressurized to a predetermined value to determine whether there is leakage. After the test is passed, the spiral plate is welded, and a sealed water-tightening and pressurizing test is performed on both ends of the spiral plate. Finally, the 3D deep condensation module is tested as a whole. During the test, two liquids are respectively subjected to a sealed water-tightening and pressurizing test in the channels of the spiral heat exchange plate and the spiral plate. After the experiment, the concentration of the two liquids is tested. When the concentration is within the threshold range, the test is passed. When the concentration exceeds the set threshold, it is determined that a leakage point exists. One of the two liquids is clean water, and the other is a colored liquid, alcohol or chemical reagent.

3. The combined condensation system according to claim 1, characterized in that: The circular heat exchange thin plate is welded with a water guide nozzle on the inner side of the first inner water guide hole; the water guide nozzle is a direct drainage structure or a one-way valve structure.

4. The combined condensation system according to claim 1, characterized in that: It also includes a short outer diameter 3D deep condensation module; the short outer diameter 3D deep condensation module includes multiple groups of spiral heat exchange plates, circular heat exchange plates and spiral plates, and welding and sealing experiments are carried out according to the manufacturing method of the 3D deep condensation module; the outer diameter of the spiral heat exchange plates of the short outer diameter 3D deep condensation module is consistent with the outer diameter of the spiral heat exchange plates on the top surface of the 3D deep condensation module, the short outer diameter 3D deep condensation module is fixed to the top surface of the 3D deep condensation module to form a convex condensation module, and the channels of adjacent layers of spiral heat exchange plates are internally connected or externally connected.

5. The combined condensation system according to claim 4, characterized in that: The 3D deep condensation modules or convex condensation modules are provided in multiple groups and connected in parallel to form a condensation module.

6. The combined condensation system according to claim 1, characterized in that: The second heat recovery system is a low calorific value direct recycling circulation pipeline; or a circulation pipeline connected in series with a refrigeration module; or a secondary circulation pipeline connected in series with a compressor and a condenser, and the low boiling point medium to be heated is injected into the secondary circulation pipeline; the circulation pipeline is selected according to the use scenario. When the use scenario requires low calorific value, the low calorific value direct recycling circulation pipeline is used. When the use scenario requires low calorific value, the secondary circulation pipeline is used. When the use scenario requires low calorific value, the circulation pipeline of the refrigeration module is used for in-depth cooling and recycling.

7. The combined condensation system according to claim 1, characterized in that: The high-temperature fluid pipeline injects high-calorie fluid into the heat medium end on the input side of the front-end condensing module, and recovers most of the heat through the first heat recovery system. The heat medium end on the output side of the front-end condensing module exports the low-grade heat fluid and sends it to the heat medium input end of the rear-end condensing module. The second heat recovery system of the rear-end condensing module performs secondary heat exchange to recover the heat. During the secondary heat exchange, a 3D deep condensation module is used, and the hot medium and the cold medium adopt a three-dimensional encapsulated circulation heat exchange, so as to fully absorb the low-grade heat fluid.

8. The combined condensation system according to claim 1 or 4, characterized in that: The 3D deep condensation module has the following working process: the circular heat exchange thin plate, the spiral heat exchange thin plate and the spiral thin plate respectively form two sets of parallel spiral circulation channels on the top and bottom surfaces of the circular heat exchange thin plate, the low-grade heat fluid flows in from the bottom circulation channel and flows out from the top circulation channel, the cold medium flows in from the top circulation channel and flows out from the bottom circulation channel, because the outer diameter of the bottom circulation channel is larger than that of the top circulation channel; The low-grade heat fluid in the spiral section of the circulation channel on the protruding top surface does not need to exchange heat with the circulation channel on the top layer. Therefore, when the cold medium flows out, it is heated by the low-grade heat fluid in the circulation channel on the adjacent side to a temperature close to the low-grade heat fluid temperature, ensuring that the output side reaches the highest temperature; when the cold medium enters the 3D deep condensation module from the top surface, the cold medium adopts 3D heat exchange, that is, the upper and lower surfaces and the two sides are synchronously heated in a three-dimensional manner by wrapping the cold medium, and the hot medium is wrapped around the cold medium in a three-dimensional manner to fully and deeply exchange heat. Finally, after directly passing through the flow channel on the output side for output heat exchange, the output is close to the temperature of the low-grade heat fluid; when it is necessary to enter deep condensation, a convex condensation module is used, and a convex structure is used to perform multi-layer heat exchange before output, so as to ensure that the cold medium reaching the output side fully absorbs heat, and the bottom flow channel is larger than the upper flow channel. The cold medium on the output side is in direct contact with the hottest end, ensuring that the heating product outputs the highest calorific value and avoiding heat loss. That is, at the same time, when the flow is introduced, the bottom volume is larger than the top, so that the heat supply flow of the heat medium is stable.

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