Low-resistance high-efficiency double-layer spiral cross countercurrent heat exchanger

Abstract

According to the technical scheme, the low-resistance efficient double-layer spiral cross countercurrent heat exchanger comprises a heat exchange sealing bin, and a heat exchange pipe set, a hot end inlet collecting pipe, a hot end outlet collecting pipe and a cold end inlet collecting pipe are arranged in an inner cavity of the heat exchange sealing bin; each heat exchange tube group comprises a hot end heat exchange spiral tube and a cold end heat exchange spiral tube which are spirally wound with each other; the inlet end of each hot end heat exchange spiral pipe is communicated with the hot end inlet collecting pipe; the outlet end of each hot end heat exchange spiral pipe is communicated with a hot end outlet collecting pipe; the inlet ends of the cold end heat exchange spiral pipes communicate with the cold end inlet collecting pipe, and the outlet ends of the cold end heat exchange spiral pipes are suspended in an inner cavity of the heat exchange sealing bin. The hot-end heat exchange spiral pipe and the cold-end heat exchange spiral pipe are in a spiral winding mode, the contact area is larger, the hot-end heat exchange spiral pipe and the cold-end heat exchange spiral pipe are fixed in a matched mode through the long screw, the aerogel composite heat insulation screw gasket, the pressing gasket and the pressing nut, contact is tighter, more sufficient heat exchange can be achieved, and the heat exchange efficiency is higher.

Description

Technical Field

[0001] The present invention relates to the field of heat exchangers, in particular to a low-resistance and high-efficiency double-layer spiral cross-counterflow heat exchanger. Background Art

[0002] As the core equipment for industrial heat energy transfer, heat exchangers are widely used in chemical industry, electric power, HVAC, seawater desalination, food processing and other fields.

[0003] Traditional heat exchangers include shell and tube heat exchangers and plate heat exchangers:

[0004] Shell and tube heat exchangers (such as shell and tube, U-tube) rely on straight tube or simple bend tube design, and the hot and cold fluids are mostly co-current or partially counter-current. The heat transfer coefficient is usually 3,000–8,000 W / (m 2 ·K), it is difficult to meet the demand for efficient heat exchange.

[0005] Although plate heat exchangers induce turbulence through corrugated plates, they are limited by the plate spacing (3–5 mm) and the seal structure of the rubber strips, and the heat transfer efficiency (5,000–8,000 W / (m 2 It is difficult to balance K) and pressure resistance (<1.6MPa).

[0006] Boundary layer effect: The fluid in the traditional heat exchanger tends to form a stable boundary layer, which increases the thermal resistance and reduces the heat transfer efficiency.

[0007] In summary, traditional heat exchangers all have the problems of low heat exchange efficiency and insufficient heat transfer efficiency. Summary of the Invention

[0008] To address the above technical issues, the present invention provides a low-resistance, high-efficiency, double-layer spiral cross-counterflow heat exchanger. The hot-end and cold-end heat exchange coils are spirally wound, resulting in a larger contact area and closer contact between the two, enabling more complete heat exchange and higher heat exchange efficiency.

[0009] The technical solution adopted by the present invention to solve the technical problem is: a low-resistance and high-efficiency double-layer spiral cross countercurrent heat exchanger, comprising a heat exchange sealed chamber, the inner cavity of which is provided with a heat exchange tube group, a hot end inlet manifold, a hot end outlet manifold and a cold end inlet manifold;

[0010] The heat exchange tube group is provided with several groups, and the heat exchange tube group includes a hot end heat exchange spiral tube and a cold end heat exchange spiral tube which are spirally cross-wound;

[0011] The inlet end of each of the hot end heat exchange spiral tubes is connected to the hot end inlet manifold, and the hot end inlet manifold is connected to the outside through the wall of the heat exchange sealed chamber;

[0012] The outlet end of each of the hot end heat exchange spiral tubes is connected to the hot end outlet manifold, and the hot end outlet manifold is connected to the outside through the warehouse wall of the heat exchange sealed warehouse;

[0013] The inlet end of each cold-end heat exchange spiral tube is connected to the cold-end inlet manifold, and the cold-end inlet manifold is connected to the outside at the wall of the heat exchange sealed warehouse. The outlet end of each cold-end heat exchange spiral tube is suspended in the inner cavity of the heat exchange sealed warehouse, and the side wall of the heat exchange sealed warehouse is provided with a cold-end outlet connecting the inside and the outside.

[0014] The hot-end fluid enters through the outer port of the hot-end inlet manifold, then flows from the inlet to the outlet of each hot-end heat exchange spiral tube, then flows out through the hot-end outlet manifold to the outer port. The cold-end fluid enters through the outer port of the cold-end inlet manifold, then flows from the inlet to the outlet of each cold-end heat exchange spiral tube, then flows into the inner cavity of the heat exchange sealed chamber, and finally flows out from the cold-end outlet.

[0015] Preferably, the inlet end of the hot-end heat exchange spiral tube and the inlet end of the cold-end heat exchange spiral tube are arranged in opposite directions.

[0016] It can realize cross-counterflow of cold-end fluid and hot-end fluid, which can further improve the heat exchange efficiency.

[0017] Preferably, a long screw is passed through the middle of the heat exchange tube group, and an aerogel composite insulating screw gasket, a compression gasket and a compression nut are respectively arranged from the inside to the outside at both ends of the long screw corresponding to the heat exchange tube group. The compression nut pushes the compression gasket and the aerogel composite insulating gasket to fix the long screw relative to the heat exchange tube group.

[0018] The heat exchange tube group can be relatively fixed by structures such as long screws, and the use of insulating gaskets can avoid heat loss caused by heat conduction transmission and cross interference of heat exchange temperature.

[0019] Preferably, the ports of the hot end inlet manifold, the hot end outlet manifold and the cold end inlet manifold are respectively fixed to the warehouse wall of the heat exchange sealed warehouse by flange bolts; aerogel composite insulation gaskets are respectively provided between the warehouse wall of the heat exchange sealed warehouse and the ports of the hot end inlet manifold, the hot end outlet manifold and the cold end inlet manifold.

[0020] The use of aerogel composite insulation gasket can play a sealing role and can block the heat loss caused by the internal heat being transmitted to the outside of the heat exchange sealed chamber due to metal heat conduction.

[0021] Preferably, the heat exchange sealed chamber is provided with an exhaust valve. The exhaust valve must be used to exhaust the air in the heat exchange sealed chamber during operation, otherwise the operation cannot be performed. The exhaust valve can also be used to exhaust air when the internal air pressure is too high to regulate the internal pressure.

[0022] Preferably, a drain pipe is flanged to the bottom of the heat exchange chamber. An aerogel composite insulating flange gasket is installed between the drain pipe and the chamber to drain waste from the chamber. The aerogel composite insulating flange gasket seals this area and provides a barrier to heat conduction.

[0023] Preferably, the bottom of the heat exchange sealed chamber is provided with base support beams at the front and rear, and the two ends of the base support beam are fixed downward with support bases by bolts. The support bases can be used to provide support for the heat exchange sealed chamber.

[0024] Preferably, both ends of the hot end outlet manifold and the cold end inlet manifold are respectively provided with side sliding assemblies; the side sliding assemblies further include groove rails, caster support beams and casters;

[0025] The groove rail is fixed to the bottom of the heat exchange sealed chamber, and the end of the groove rail points to the side wall of the heat exchange sealed chamber;

[0026] The caster support beam is provided with a plurality of wheel axles, and the wheel axles are provided with casters through bearings. The outer ends of the wheel axles are locked with the casters to adapt to the groove rails through caster nuts.

[0027] During internal maintenance, the heat exchange tube group can be moved out from the side wall of the heat exchange sealed chamber, and the casters and groove rails make it easier and more convenient to move.

[0028] Preferably, the heat exchange tube group, hot end inlet manifold, hot end outlet manifold, and cold end inlet manifold are coated with an aerogel composite thermal insulation encapsulation coating; and the outer wall of the heat exchange sealed chamber is coated with an aerogel composite thermal insulation encapsulation coating. The aerogel composite thermal insulation encapsulation coating can provide insulation, preventing heat conduction from the heat exchange tube group, hot end inlet manifold, hot end outlet manifold, and cold end inlet manifold to the heat exchange sealed chamber, and also preventing heat conduction from the heat exchange sealed chamber to the outside.

[0029] Preferably, the inner wall of the side plate of the heat exchange sealed chamber is provided with a heat absorbing grille, which is used to absorb the radiant heat of the heat exchange unit group, so that the cold end fluid can more fully utilize the radiant heat of the heat exchange unit, reduce heat loss and improve heat exchange efficiency.

[0030] Advantages of the present invention:

[0031] After the cold-end fluid exchanges heat through the spiral structure of the heat exchange tube group, the inner cavity of the heat exchange sealed chamber can fully absorb the residual heat in the heat exchange sealed chamber. The heat exchange process is achieved through the spiral structure. Due to the integrated structure of the cold-end outlet and the side wall of the heat exchange sealed chamber, the cold-end outlet can be directly connected to the circulation pump inlet, thus eliminating the step of connecting the cold-end inlet in series with the circulation pump for forced circulation heat exchange in traditional plate heat exchangers. This effectively reduces the secondary pressure drop of the circulation pump, thereby reducing the energy consumption of the circulation pump and achieving low-resistance operation. Aerogel composite insulation materials are used in all key parts to block outward heat conduction, reducing heat loss, more fully utilizing heat and improving heat exchange efficiency.

[0032] In this solution, the hot-end heat exchange spiral tube and the cold-end heat exchange spiral tube are spirally wound, with a larger contact area. The hot-end heat exchange spiral tube and the cold-end heat exchange spiral tube are fixed by a long screw, an aerogel composite insulation screw gasket, a compression gasket and a compression nut. The contact is closer, which can achieve more sufficient heat exchange and higher heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only eight of the drawings of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 is a schematic diagram of a housing according to an embodiment of the present invention;

[0035] Figure 2 is a schematic diagram of an embodiment of the present invention without a housing;

[0036] Figure 3 Schematic diagram of the separation of the hot-end heat exchange spiral tube and the cold-end heat exchange spiral tube according to an embodiment of the present invention;

[0037] Figure 4 Schematic diagram of a long screw and a compression nut according to an embodiment of the present invention;

[0038] Figure 5 Schematic diagram of a hot end inlet manifold, a hot end outlet manifold, and a cold end inlet manifold in an embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram of the caster structure according to an embodiment of the present invention;

[0040] Figure 7 This is a schematic diagram of a heat exchange sealed chamber according to an embodiment of the present invention;

[0041] Figure 8 Schematic diagram of the side panels and heat absorbing grille according to an embodiment of the present invention;

[0042] Among them, 1. heat exchange sealing chamber; 2. heat exchange tube group; 3. hot end heat exchange spiral tube; 4. cold end heat exchange spiral tube; 5. hot end inlet manifold; 6. hot end outlet manifold; 7. cold end inlet manifold; 8. long screw; 9. aerogel composite insulation screw gasket; 10. compression gasket; 11. compression nut; 12. exhaust valve; 13. drain pipe; 14. aerogel composite insulation flange gasket; 15. base support beam; 16. support base; 17. groove rail; 18. caster support beam; 19. wheel axle; 20. bearing; 21. caster; 22. heat absorption grille; 23. lifting lug; 24. cold end outlet. DETAILED DESCRIPTION

[0043] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The embodiments are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0044] Example

[0045] like Figure 1 As shown, the low-resistance and high-efficiency double-layer spiral cross countercurrent heat exchanger includes a heat exchange sealed chamber 1, the inner cavity of which is provided with a heat exchange tube group 2, a hot end inlet manifold 5, a hot end outlet manifold 6 and a cold end inlet manifold 7.

[0046] The heat exchange tube group 2 is provided with several groups, and the heat exchange tube group 2 includes a hot end heat exchange spiral tube 3 and a cold end heat exchange spiral tube 4 that are spirally cross-wound.

[0047] The inlet end of each of the hot-end heat exchange spiral tubes 3 is connected to the hot-end inlet manifold 5 , and the hot-end inlet manifold 5 is connected to the outside at the warehouse wall of the heat exchange sealed warehouse 1 .

[0048] The outlet end of each of the hot-end heat exchange spiral tubes 3 is connected to the hot-end outlet manifold 6 , and the hot-end outlet manifold 6 is connected to the outside at the warehouse wall of the heat exchange sealed warehouse 1 .

[0049] The inlet end of each cold end heat exchange spiral tube 4 is connected to the cold end inlet manifold 7, and the cold end inlet manifold 7 is connected to the outside at the warehouse wall of the heat exchange sealed warehouse 1. The outlet end of each cold end heat exchange spiral tube 4 and the side wall of the heat exchange sealed warehouse 1 are provided with a cold end outlet 24 connecting the inside and the outside.

[0050] In this solution, 10 heat exchange tube groups 2 are provided. In practice, the number of heat exchange tube groups 2 can be expanded as needed.

[0051] After the above components are assembled, an aerogel composite insulation layer is used for thermal insulation packaging, which effectively curbs the heat loss caused by the temperature crossover between the cold-end fluid and the hot-end fluid and metal conduction.

[0052] This solution is a double-layer spiral cross-counterflow heat exchanger with low resistance and high efficiency. Through its unique double-layer spiral structure and counterflow heat exchange design, this heat exchanger significantly improves heat exchange efficiency while effectively reducing fluid flow resistance. It is suitable for a variety of industrial applications and has broad market prospects and application value.

[0053] The main function of the heat exchange sealed chamber 1 is to be a key component for connecting the container for the cold end fluid to flow in and out and the internal and external components. A lifting ring is provided on the heat exchange sealed chamber 1 from the side plate upwards.

[0054] The heat exchange sealed chamber 1 includes side plates and a shell. The shell is an annular structure. The two ends of the shell are sealed by side plates respectively. The side plates are provided with sealing grooves adapted to the ends of the shell. The sealing grooves are sealed with aerogel-compliant insulating sealing strips. The two side plates are connected by 18 sets of bolts and nuts.

[0055] The hot-end fluid enters through the outer port of the hot-end inlet manifold 5, then flows from the inlet end to the outlet end of each hot-end heat exchange spiral tube 3, then flows out through the hot-end outlet manifold 6 to the outer port. The cold-end fluid enters through the outer port of the cold-end inlet manifold 7, then flows from the inlet end to the outlet end of each cold-end heat exchange spiral tube 4, then converges into the inner cavity of the heat exchange sealed chamber 1, and finally flows out through the cold-end outlet 24.

[0056] The inlet end of the hot-end heat exchange spiral tube 3 and the inlet end of the cold-end heat exchange spiral tube 4 are arranged in opposite directions.

[0057] It can realize cross-counterflow of cold-end fluid and hot-end fluid, which can further improve the heat exchange efficiency.

[0058] A long screw 8 is passed through the middle of the heat exchange tube group 2. The long screw 8 is provided with an aerogel composite insulating screw gasket 9, a compression gasket 10 and a compression nut 11 from the inside to the outside at both ends of the heat exchange tube group 2. The compression nut 11 pushes the compression gasket 10 and the aerogel composite insulating gasket to press and fix the long screw 8 relative to the heat exchange tube group 2.

[0059] The heat exchange tube group 2 can be relatively fixed by structures such as the long screw 8, and the use of thermal insulation gaskets can avoid heat loss caused by heat conduction transmission and cross interference of heat exchange temperature.

[0060] The ports of the hot end inlet manifold 5, the hot end outlet manifold 6 and the cold end inlet manifold 7 are respectively fixed to the warehouse wall of the heat exchange sealed warehouse 1 by flange bolts; aerogel composite insulation gaskets are respectively provided between the warehouse wall of the heat exchange sealed warehouse 1 and the ports of the hot end inlet manifold 5, the hot end outlet manifold 6 and the cold end inlet manifold 7.

[0061] The use of the aerogel composite thermal insulation gasket can play a sealing role and can block the heat loss caused by the internal heat being transmitted to the outside of the heat exchange sealed chamber 1 due to the metal heat conduction.

[0062] The heat exchange sealed chamber 1 is provided with an exhaust valve 12. During operation, the air in the heat exchange sealed chamber 1 must be discharged through the exhaust valve 12, otherwise it cannot be operated. It can also be used to exhaust when the internal air pressure is too high to adjust the internal pressure.

[0063] The bottom of the heat exchange sealed chamber 1 is connected to a drain pipe 13 via a flange. An aerogel composite insulation flange gasket 14 is installed between the drain pipe 13 and the heat exchange sealed chamber 1 to drain waste from the heat exchange sealed chamber 1. The aerogel composite insulation flange gasket 14 is used in this area to provide a seal and block heat conduction.

[0064] The bottom of the heat exchange sealed chamber 1 is provided with base support beams 15 at the front and back, and the two ends of the base support beam 15 are fixed downward with support bases 16 by bolts. The support bases 16 can be used to provide support for the heat exchange sealed chamber 1.

[0065] Both ends of the hot end outlet manifold 6 and the cold end inlet manifold 7 are provided with side sliding assemblies respectively; the side sliding assemblies further include groove rails 17, caster support beams 18 and casters 21;

[0066] The groove rail 17 is fixed to the bottom of the heat exchange sealed chamber 1, and the end of the groove rail 17 points to the side wall of the heat exchange sealed chamber 1;

[0067] The caster support beam 18 is provided with a plurality of axles 19 , and the axles 19 are provided with casters 21 through bearings 20 . The outer ends of the axles 19 are locked with casters 21 through caster 21 nuts to adapt to the groove rail 17 .

[0068] During internal maintenance, the heat exchange tube group can be moved out from the side wall of the heat exchange sealing chamber 1, and the casters 21 and the groove rails 17 make it easier and more convenient to move.

[0069] The heat exchange tube group, hot-end inlet manifold 5, hot-end outlet manifold 6, and cold-end inlet manifold 7 are coated with an aerogel composite thermal insulation encapsulation coating; the outer wall of the heat exchange sealed chamber 1 is also coated with an aerogel composite thermal insulation encapsulation coating. The aerogel composite thermal insulation encapsulation coating provides insulation, preventing heat transfer from the heat exchange tube group, hot-end inlet manifold 5, hot-end outlet manifold 6, and cold-end inlet manifold 7 to the heat exchange sealed chamber 1, and also preventing heat transfer from the heat exchange sealed chamber 1 to the outside.

[0070] The inner wall of the side panel of the heat exchange sealed chamber 1 is provided with a heat absorbing grille 22. The heat absorbing grille 22 is used to absorb the radiant heat of the heat exchange unit group, allowing the cold end fluid to more fully utilize the radiant heat of the heat exchange unit, reducing heat loss and improving heat exchange efficiency. The magnetized anti-scaling magnetic strip group prevents scale formation and prolongs service life.

[0071] Key technical description of this embodiment

[0072] 1. The heat exchange tube group in this scheme is made of copper T1 oblate tube (short axis 3-20mm, long axis 6-60mm) and is wound in the same direction with a cross angle of 30°-60°. The hot and cold fluids flow in opposite directions (Re>1.5×10 4 ) to form a three-dimensional turbulent channel. Through the optimization design of chemical cleaning frequency, the equipment life is ≥15 years (traditional ≤10 years). Heat transfer performance formula verification: h=0.023·Dhk·Re0.8·Pr0.4

[0073] Parameter definition: Dh = P4A

[0074] (A is the cross-sectional area of the oblate tube, P is the wetted perimeter) Example calculation (minor axis 6mm, major axis 12mm):

[0075] Dh=2×(6+12)4×(6×12)=8.5mm

[0076] h=0.023·0.0085401·(1.5×104)0.8·(0.7)0.4=12,200W / (m 2 \cdotpK) Durability

[0077] Improved lifespan: Chemical cleaning cycles are extended to 2.5 times that of traditional solutions (≥15 years vs. ≤10 years)

[0078] parameter Definition and Explanation unit h Convective heat transfer coefficient <![CDATA[W / (m 2 ·K)]]> Dh Equivalent diameter (elliptical tube equivalent diameter) mm Re Reynolds number - Pr Prandtl number - k Thermal conductivity of pipe W / (m·K)

[0079] 2. Insulation system: Aerogel composite felt (thermal conductivity λ < 0.02W / (m·K), thickness ≥ 50mm) Heat loss control formula correction: Qloss = dλAΔT × f (f = 1.05-1.15 is the dynamic working condition correction factor)

[0080] Measured data: heat loss rate ≤ 2.8% (@ΔT = 750°C, ambient temperature 25°C) for key components;

[0081] Compression screw: aerogel sheath (thickness ≥ 5mm)

[0082] Flange sealing: Aerogel gasket (compression rate 25% ± 3%)

[0083] Outer insulation layer: aerogel composite structure (total thickness ≥50mm).

[0084]

[0085]

[0086] 3. Modular expansion design unit parameters: Single tube heat exchange capacity: q = h·πDL·ΔT = 12,200 × π × 0.0085 × 1 × (820-45) = 32,780W / m Total heat exchange area: Atotal = N × πDL (N = 83-833 tubes) Adaptation range Heat load: 0.1-10MW (based on single module 15m 3 / h flow calculation) Standardized components:

[0087] The universal design of aerogel gaskets and flange bolts reduces assembly complexity and procurement costs by 20%–30%.

[0088] parameter Definition and Explanation unit q Heat transfer power per unit length of a single heat exchange tube W / m h Heat transfer capacity between fluid and pipe wall <![CDATA[W / (m 2 ·K)]]> D Equivalent outer diameter of oblate tube (equivalent to the diameter of a circular tube when the short axis is 6mm and the long axis is 12mm) m L Length of a single heat exchange tube m ΔT The temperature difference between the hot and cold fluids K N Total number of heat exchange tubes in a single module

[0089] Advantages of the present invention:

[0090] After the cold-end fluid passes through the spiral structure of the heat exchange tube group 2 for heat exchange, the inner cavity of the heat exchange sealed chamber 1 can fully absorb the residual heat in the heat exchange sealed chamber 1. The heat exchange process is realized by the spiral structure. Due to the integrated structure of the cold-end outlet and the side wall of the heat exchange sealed chamber, the cold-end outlet can be directly connected to the circulation pump inlet, thereby eliminating the step of connecting the cold-end inlet in series with the circulation pump for forced circulation heat exchange in the traditional plate heat exchanger, effectively reducing the secondary pressure drop of the circulation pump, thereby reducing the energy consumption of the circulation pump and achieving low-resistance operation, energy saving effect and comprehensive improvement of equipment life. Its scientific design and engineering verification show that this technology has significant economic efficiency and application prospects in the fields of industry, HVAC and seawater desalination, and provides an innovative solution for high-efficiency heat exchange equipment. Aerogel composite insulation materials are used in all key parts to block outward heat conduction, reducing heat loss, making more effective use of heat and improving heat exchange efficiency.

[0091] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0092] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. Low resistance and high efficiency double-layer spiral cross-counterflow heat exchanger, characterized by: It comprises a heat exchange sealed chamber (1), wherein the inner cavity of the heat exchange sealed chamber (1) is provided with a heat exchange tube group (2), a hot end inlet manifold (5), a hot end outlet manifold (6) and a cold end inlet manifold (7); The heat exchange tube group (2) is provided with a plurality of groups, and the heat exchange tube group (2) includes a hot end heat exchange spiral tube (3) and a cold end heat exchange spiral tube (4) that are spirally cross-wound; The inlet end of each of the hot end heat exchange spiral tubes (3) is connected to the hot end inlet manifold (5), and the hot end inlet manifold (5) is connected to the outside at the wall of the heat exchange sealed chamber (1); The outlet end of each of the hot end heat exchange spiral tubes (3) is connected to the hot end outlet manifold (6), and the hot end outlet manifold (6) is connected to the outside at the wall of the heat exchange sealed chamber (1); The inlet end of each cold-end heat exchange spiral tube (4) is connected to the cold-end inlet manifold (7), and the cold-end inlet manifold (7) is connected to the outside at the wall of the heat exchange sealed chamber (1). The outlet end of each cold-end heat exchange spiral tube (4) is suspended in the inner cavity of the heat exchange sealed chamber (1), and the side wall of the heat exchange sealed chamber (1) is provided with a cold-end outlet (24) connecting the inside and the outside.

2. The low-resistance and high-efficiency double-layer spiral cross-counterflow heat exchanger according to claim 1 is characterized by: The inlet end of the hot-end heat exchange spiral tube (3) and the inlet end of the cold-end heat exchange spiral tube (4) are arranged in opposite directions.

3. The low-resistance and high-efficiency double-layer spiral cross-counterflow heat exchanger according to claim 2 is characterized in that: A long screw (8) is passed through the middle of the heat exchange tube group (2), and an aerogel composite insulating screw gasket (9), a compression gasket (10) and a compression nut (11) are respectively arranged from the inside to the outside at the two ends of the long screw (8) corresponding to the heat exchange tube group (2). The compression nut (11) pushes the compression gasket (10) and the insulating gasket to press and fix the long screw (8) relative to the heat exchange tube group (2).

4. The low-resistance and high-efficiency double-layer spiral cross-counterflow heat exchanger according to claim 3 is characterized by: The ports of the hot end inlet manifold (5), the hot end outlet manifold (6), and the cold end inlet manifold (7) are respectively fixed to the wall of the heat exchange sealed chamber (1) by using flange bolts; and aerogel composite insulation gaskets are respectively provided between the wall of the heat exchange sealed chamber (1) and the ports of the hot end inlet manifold (5), the hot end outlet manifold (6), and the cold end inlet manifold (7).

5. The low-resistance and high-efficiency double-layer spiral cross-counterflow heat exchanger according to claim 1 is characterized in that: The heat exchange sealed chamber (1) is provided with an exhaust valve (12).

6. The low-resistance and high-efficiency double-layer spiral cross-counterflow heat exchanger according to claim 1 is characterized by: The bottom of the heat exchange sealed chamber (1) is connected to a sewage pipe (13) via a flange, and an aerogel composite insulation flange gasket (14) is provided between the sewage pipe (13) and the heat exchange sealed chamber (1).

7. The low-resistance and high-efficiency double-layer spiral cross-counterflow heat exchanger according to claim 1 is characterized in that: Base support beams (15) are respectively provided at the front and rear of the bottom of the heat exchange sealing chamber (1), and support bases (16) are fixed downwardly at both ends of the base support beam (15) by bolts.

8. The low-resistance and high-efficiency double-layer spiral cross-counterflow heat exchanger according to claim 1, characterized in that: Both ends of the hot end outlet manifold (6) and the cold end inlet manifold (7) are respectively provided with side sliding assemblies; the side sliding assemblies further include groove rails (17), caster support beams (18) and casters (21); The groove rail (17) is fixed to the bottom of the heat exchange sealed chamber (1), and the end of the groove rail (17) points to the side wall of the heat exchange sealed chamber (1); The caster support beam (18) is provided with a plurality of wheel axles (19), and the wheel axles (19) are provided with casters (21) through bearings (20). The outer ends of the wheel axles (19) are locked with casters (21) through caster (21) nuts to adapt to the groove rail (17).

9. The low-resistance and high-efficiency double-layer spiral cross-counterflow heat exchanger according to claim 1, characterized in that: The surfaces of the heat exchange tube group (2), the hot end inlet manifold (5), the hot end outlet manifold (6) and the cold end inlet manifold (7) are provided with an aerogel composite thermal insulation packaging coating; and the outer wall of the heat exchange sealing chamber (1) is provided with an aerogel composite thermal insulation packaging coating.

10. The low-resistance and high-efficiency double-layer spiral cross-counterflow heat exchanger according to claim 1, characterized in that: The inner wall of the side plate of the heat exchange sealed chamber (1) is provided with a heat absorbing grille (22).

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