A heating network system capable of reducing heat loss and pipe support friction

Abstract

The present invention discloses a heat network system capable of reducing heat loss and pipe support friction, comprising a working steel pipe, an outer protective casing pipe and an insulation layer arranged between the working steel pipe and the outer protective casing pipe; the heat network system also comprises an inner rolling pipe support, an intermediate support ring and a composite insulation structure layer; the intermediate support ring is arranged between the working steel pipe and the outer protective casing pipe, the insulation layer is arranged between the intermediate support ring and the outer protective casing pipe, the rolling pipe support and the composite insulation structure layer are arranged between the working steel pipe and the intermediate support ring; the composite insulation structure layer is reserved with an installation space for the inner rolling pipe support; the inner rolling pipe support forms a rolling support for the bottom of the working steel pipe. The present invention changes the supporting mode of the working pipe and the pipe support, reduces the friction coefficient; changes the insulation structure, reduces the insulation thickness and weight, reduces the insulation diameter, reduces the total heat loss of the heat network, and reduces the total investment cost of the heat network.

Description

Technical Field

[0001] The invention belongs to the technical field of steam thermal pipeline engineering, and in particular relates to a heat network system capable of reducing heat loss and pipe support friction. Background Art

[0002] At present, the working pipe in the steam thermal network will elongate due to the temperature of the steam medium, and thermal displacement will occur at the compensation end. The weight of the pipeline and the insulation material acts on the pipe support, which will generate friction between the bottom plate of the pipe support and the embedded steel plate of the pier. All the friction reaction forces of the pipe support are transmitted to the fixed section. The friction reaction force plus the reaction force generated by the compensator constitute the thrust of the fixed section. The size of the thrust determines the distance between the two fixed sections. Therefore, reducing the friction reaction force and the reaction force of the compensator is the key to increasing the length of the compensation section.

[0003] In addition, reducing the heat loss of the pipe support itself can reduce the total heat loss of the pipeline network. At present, the thermal insulation structure can make the steam transmission radius of the pipeline network reach more than 40 kilometers. To increase the transmission distance, it is necessary to optimize the thermal insulation structure of the pipeline network. Reducing the heat loss of the pipeline network insulation is the key. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a heating network system capable of reducing heat loss and pipe support friction, thereby increasing the transmission distance and reducing the pipe network cost.

[0005] The present invention is achieved as follows: a heating network system capable of reducing heat loss and pipe support friction, comprising a working steel pipe, an outer protective casing pipe and an insulation layer arranged between the working steel pipe and the outer protective casing pipe; the heating network system also includes an inner rolling pipe support, an intermediate support ring and a composite insulation structure layer; the intermediate support ring is arranged between the working steel pipe and the outer protective casing pipe, the insulation layer is arranged between the intermediate support ring and the outer protective casing pipe, the rolling pipe support and the composite insulation structure layer are arranged between the working steel pipe and the intermediate support ring; an installation space for the inner rolling pipe support is reserved in the composite insulation structure layer; the inner rolling pipe support forms a rolling support for the bottom of the working steel pipe.

[0006] Furthermore, the inner rolling pipe support includes a roller, a support seat and a roller shaft; the intermediate support ring is arranged on the outer periphery of the composite thermal insulation structure layer, the support seat is arranged below the working steel pipe, the roller shaft is arranged on the support seat, the roller is arranged on the roller shaft and forms a rolling contact with the outer cylindrical bottom of the working steel pipe; the central axis of the roller shaft is perpendicular to the central axis of the working steel pipe.

[0007] Furthermore, the inner rolling tube support also includes a heat insulator, which is arranged at the bottom of the inner wall of the middle support ring to support the support seat.

[0008] Furthermore, the inner rolling tube support also includes an inner support limiting ring; the inner support limiting ring is sleeved on the outer circumference of the working steel tube and connected to the support seat.

[0009] Furthermore, the outer circumferential surface of the roller shaft is provided with a friction-reducing coating.

[0010] Furthermore, the outer circumferential surface of the roller is a curved surface matching the outer circumferential surface of the working steel pipe.

[0011] Furthermore, the composite thermal insulation structure layer also includes an inner skeleton support sleeve assembly, a first aluminum foil reflective layer, a nano aerogel thermal insulation layer, a first aluminum foil reflective layer, a first thermal insulation layer, a second aluminum foil reflective layer, a second thermal insulation layer, a third aluminum foil reflective layer, a second thermal insulation layer, a third aluminum foil reflective layer, a third thermal insulation layer, an anti-convection thermal insulation layer and an intermediate support sleeve, which are arranged in sequence from the inside to the outside; the heat resistance of the first aluminum foil reflective layer, the second aluminum foil reflective layer and the third aluminum foil reflective layer decreases in sequence.

[0012] Furthermore, the inner skeleton support sleeve assembly includes a cylindrical steel wire mesh, an inner skeleton support roller and an inner skeleton support roller shaft; the cylindrical steel wire mesh and the working steel pipe are isolated from each other, the inner skeleton support roller shaft is arranged on the cylindrical steel wire mesh, and the inner skeleton support roller is arranged on the inner skeleton support roller shaft and is in rolling contact with the outer circumferential surface of the working steel pipe.

[0013] Further, when the working steel pipes in the heat network system are arranged in a pier manner, the heat network system also includes an overhead pipe support arranged on the embedded steel plate of the concrete pier; the overhead pipe support is arranged at the axial position of the inner rolling pipe support; the overhead pipe support includes an upper hoop, an upper hoop connecting ear fastening bolt, an upper hoop connecting ear, a lower hoop connecting ear, a lower hoop, a bottom plate supporting vertical plate and a bottom plate base; an upper hoop connecting ear is arranged at each end of the upper hoop, and a lower hoop connecting ear is arranged at each end of the lower hoop; the upper hoop and the lower hoop are arranged oppositely on the outer circumferential surface of the outer sheath pipe and the corresponding upper hoop connecting ear and the lower hoop connecting ear are connected by the upper hoop connecting ear fastening bolt; the bottom plate supporting vertical plate is arranged at the bottom of the lower hoop, and the bottom plate base is arranged at the bottom of the bottom plate supporting vertical plate; a stainless steel drag reduction layer is arranged between the bottom plate base and the embedded steel plate, and a radial limit block and an axial limit block are arranged on the embedded steel plate.

[0014] Furthermore, when the working steel pipes in the heating network system are arranged in a direct buried manner, the heating network system also includes an overhead pipe support arranged on the sliding bottom plate inside the directly buried outer protective steel pipe; the overhead pipe support includes a bottom plate support upright plate and a bottom plate base; the bottom plate support upright plate is arranged at the bottom of the intermediate support ring, and the bottom plate base is arranged at the bottom of the bottom plate support upright plate; a stainless steel drag reduction layer is arranged between the bottom plate base and the sliding bottom plate, and an axial limit block is arranged on the sliding bottom plate.

[0015] Furthermore, the directly buried outer protective steel pipe and the outer protective casing pipe are the same pipe body.

[0016] Furthermore, a polyurethane foam layer bracket for fixing the thermal insulation layer is provided between the intermediate supporting ring and the outer protective sleeve tube.

[0017] The beneficial effects brought by the present invention are: changing the supporting mode of the working pipe and the pipe support, reducing the friction coefficient; changing the insulation structure, reducing the insulation thickness and insulation weight, reducing the insulation diameter, so that the steam transmission radius can exceed more than 50 kilometers; increasing the distance between two fixed nodes, reducing the number of pipe fittings, reducing the drain device, shortening the total length of the housekeeping line, reducing the total heat loss of the heating network, and reducing the total investment cost of the heating network. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a longitudinal structural cross-sectional view of the inner rolling tube support in the present invention;

[0019] Figure 2 It is a cross-sectional view of the composite thermal insulation structure of the present invention;

[0020] Figure 3 is a longitudinal structural cross-sectional view of the inner skeleton support sleeve assembly in the present invention;

[0021] Figure 4 yes Figure 3 A transverse structural cross-sectional view of the inner skeleton support sleeve assembly shown;

[0022] Figure 5 It is a structural front view of the overhead pipe support in the present invention;

[0023] Figure 6 yes Figure 5 A structural side view of the overhead pipe support shown;

[0024] Figure 7 It is a schematic diagram of the installation of the heat network system in the present invention when it is set up in a buttress manner;

[0025] Figure 8 It is a schematic diagram of the installation of the heat network system in the present invention when it is set up in a direct burial manner;

[0026] Fig. 9 It is a schematic diagram of the installation of the overhead pipe support, the inner rolling pipe support and the concrete pier in the present invention;

[0027] Fig.10 yes Fig. 9 A partial enlarged view of the installation position of the overhead pipe support, inner rolling pipe support and concrete pier is shown. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0029] like Figure 1 , 2 , 9 and 10, a heat network system capable of reducing heat loss and pipe support friction comprises a working steel pipe 1, an outer sheath pipe 10 and an insulation layer 11 arranged between the working steel pipe 1 and the outer sheath pipe 10; the heat network system further comprises an inner rolling pipe support 17, an intermediate support ring 9 and a composite insulation structure layer 8; the intermediate support ring 9 is arranged between the working steel pipe 1 and the outer sheath pipe 10, the insulation layer 11 is arranged between the intermediate support ring 9 and the outer sheath pipe 10, the rolling pipe support 17 and the composite insulation structure layer 8 are arranged between the working steel pipe 1 and the intermediate support ring 9; the composite insulation structure layer 8 is reserved with an installation space for the inner rolling pipe support 17; the inner rolling pipe support 17 forms a rolling support for the bottom of the working steel pipe 1. The insulation layer 11 is made of polyurethane rigid foam.

[0030] In one embodiment, Figure 1 As shown, the inner rolling tube support 17 includes a roller 3, a support seat 7 and a roller shaft 4. The intermediate support ring 9 is sleeved on the outer periphery of the composite thermal insulation structure layer 8, the support seat 7 is arranged below the working steel pipe 1, the roller shaft 4 is arranged on the support seat 7, and the roller 3 is arranged on the roller shaft 4 and forms a rolling contact with the outer circumferential bottom of the working steel pipe 1, so that the working steel pipe 1 rolls on the roller 3 of the inner rolling tube support 17. The central axis of the roller shaft 4 is perpendicular to the central axis of the working steel pipe 1.

[0031] In one embodiment, the inner rolling tube support 17 further includes a heat insulator 6, which is arranged at the bottom of the inner wall of the intermediate support ring 9 to support the support seat 7. The heat insulator 6 is made of a light insulation material. The heat insulator 6 is in a low temperature zone, and its thermal conductivity is lower than that in a high temperature state.

[0032] In one embodiment, the inner rolling tube support 17 further includes an inner support limiting ring 2; the radial displacement of the working steel tube 1 is limited by the inner support limiting ring 2. The inner support limiting ring 2 is sleeved on the outer circumference of the working steel tube 1 and connected to the support seat 7.

[0033] In one embodiment, the outer circumferential surface of the roller shaft 4 is provided with a friction-reducing coating 5. The friction-reducing coating 5 is made of a high-temperature-resistant and wear-resistant nano-inorganic ceramic coating, which can reduce the friction coefficient between the working steel pipe 1 and the inner rolling tube support 17 to 0.02.

[0034] In one embodiment, the outer circumference of the roller 3 is a curved surface that matches the outer circumference of the working steel pipe 1. In this way, the heat energy is transferred from the surface of the working steel pipe 1 to the surface of the roller 3 by point-line contact, and then transferred from the roller 3 to the roller shaft 4 by line-surface contact, and then the roller shaft 4 is transferred to the support seat 7 by point-surface contact, and after passing through multiple sections to cut off the thermal bridge, it is insulated by the heat insulator 6.

[0035] In one embodiment, Figure 2 As shown, the composite thermal insulation structure layer 8 also includes an inner skeleton support sleeve assembly 12, a first aluminum foil reflective layer 14, a nano-aerogel thermal insulation layer 13, a first aluminum foil reflective layer 14, a first thermal insulation layer 15, a second aluminum foil reflective layer 16, a second thermal insulation layer 18, a third aluminum foil reflective layer 19, a second thermal insulation layer 18, a third aluminum foil reflective layer 19, a third thermal insulation layer 21, an anti-convection thermal insulation layer 22 and an intermediate support sleeve 23, which are arranged in sequence from the inside to the outside; the heat resistance of the first aluminum foil reflective layer 14, the second aluminum foil reflective layer 16 and the third aluminum foil reflective layer 19 decreases in sequence, specifically, the first aluminum foil reflective layer 14, the second aluminum foil reflective layer 16 and the third aluminum foil reflective layer 19 are respectively ultra-high temperature resistant aluminum foil reflective layer, medium temperature resistant aluminum foil reflective layer and ordinary aluminum foil reflective layer. A polyurethane foam layer bracket 25 for fixing the thermal insulation layer 11 is arranged between the intermediate support ring 9 and the outer sheath tube 10. Preferably, the first thermal insulation layer 15 , the second thermal insulation layer 18 , and the third thermal insulation layer 21 are made of high-temperature glass wool or aluminum silicate needle-punched blanket.

[0036] In one embodiment, Figure 3 and 4 As shown, the inner frame support sleeve assembly 12 includes a cylindrical steel wire mesh 24, an inner frame support roller 26 and an inner frame support roller shaft 27; the cylindrical steel wire mesh 24 and the working steel pipe 1 are separated from each other, the inner frame support roller shaft 27 is arranged on the cylindrical steel wire mesh 24, and the inner frame support roller 26 is arranged on the inner frame support roller shaft 27 and is in rolling contact with the outer circumferential surface of the working steel pipe 1. Due to the weight of the heat preservation material wrapped on the supporting cylindrical steel wire mesh 24, one inner rolling pipe support can be placed at a distance of 1 meter between the two inner rolling pipe supports to ensure that the supporting cylindrical steel wire mesh 24 will not come into contact with the working steel pipe 1.

[0037] In one embodiment, Figure 5 , 6As shown in Figures 7 and 8, as a setting mode, when the working steel pipe 1 in the heat network system is set in a pier manner, the heat network system also includes an overhead pipe support 29 arranged on the embedded steel plate 40 of the concrete pier 41. The overhead pipe support 29 is arranged at the axial position where the inner rolling pipe support 17 is located; the overhead pipe support 29 includes an upper hoop 30, an upper hoop connecting ear fastening bolt 32, an upper hoop connecting ear 33, a lower hoop connecting ear 34, a lower hoop 36, a bottom plate supporting vertical plate 37 and a bottom plate base 38; an upper hoop connecting ear 33 is arranged at each end of the upper hoop 30, and an upper hoop connecting ear reinforcing rib plate 31 is arranged between the upper hoop 30 and the upper hoop connecting ear 33. A lower hoop connecting ear 34 is arranged at each end of the lower hoop 36, and a lower hoop connecting ear reinforcing rib plate 35 is arranged between the lower hoop 36 and the lower hoop connecting ear 34. The upper hoop 30 and the lower hoop 36 are arranged oppositely on the outer circumferential surface of the outer sheath tube 10 and connected to the corresponding upper hoop connecting ear 33 and the lower hoop connecting ear 34 by the upper hoop connecting ear fastening bolt 32. The bottom plate support vertical plate 37 is arranged at the bottom of the lower hoop 36, and the bottom plate base 38 is arranged at the bottom of the bottom plate support vertical plate 37; a stainless steel drag reduction layer 42 is arranged between the bottom plate base 38 and the embedded steel plate 40, and a radial limit block 43 and an axial limit block 44 are arranged on the embedded steel plate 40.

[0038] In one embodiment, Figure 8 As shown, as another arrangement, when the working steel pipe 1 in the heating network system is arranged in a direct buried manner, the heating network system further comprises an overhead pipe support 29 arranged on a sliding bottom plate 45 in the direct buried outer protective steel pipe 46; the overhead pipe support 29 comprises a bottom plate support vertical plate 37 and a bottom plate base 38; the bottom plate support vertical plate 37 is arranged at the bottom of the middle support ring 9, and the bottom plate base 38 is arranged at the bottom of the bottom plate support vertical plate 37; a stainless steel drag reduction layer 42 is arranged between the bottom plate base 38 and the sliding bottom plate 45, and an axial stop block 44 is arranged on the sliding bottom plate 45. Furthermore, the direct buried outer protective steel pipe 46 and the outer protective casing pipe 10 are the same pipe body.

[0039] Compared with the prior art, the present invention has the following advantages:

[0040] 1. Assuming that the length of the two fixed sections of the pipe network D530×10 is 900 meters, the pressure is 1.6Mpa, and the temperature is 350℃, the unit load q is only the load generated by the weight of the working steel pipe, and the unit load is reduced. The pipe support adopts the method of rolling the working steel pipe on the arc roller to reduce the friction coefficient from 0.1 to 0.05. Under the condition of the fixed section thrust remaining unchanged, the length of the compensation section can be increased by more than 3 times.

[0041] In summary, increasing the distance between the two fixed sections, adopting rolling in the working tube, reducing the weight of the insulation material, increasing the length of the cross wall of the rotary compensator and other measures can greatly increase the distance between the two fixed sections without increasing the thrust of the fixed sections, and can reach 900 meters.

[0042] 2. There are currently two main forms of traditional insulation structures. One is the aluminum silicate knitted blanket insulation plus glass wool insulation structure, and the other is the calcium silicate tile and polyurethane rigid foam insulation structure. The insulation structure of the present invention is a nano aerogel, glass wool and polyurethane rigid foam insulation structure. Two low thermal conductivity system insulation materials are selected as the insulation materials. Compared with the above two insulation structures, the heat loss is significantly reduced.

[0043] Due to the use of a rolling pipe support inside the working pipe, the roller has good overall thermal insulation performance through multi-stage thermal bridge isolation, 70% of the insulation material in the internal space of the pipe support is the same as that of the straight pipe, and the length of the pipe support will not be lengthened due to the increase in thermal displacement. Therefore, the heat loss of the pipe support of the present invention is much lower than that of the traditional pipe support.

[0044] Due to the use of long-distance compensation, the number of rotary compensator groups used is reduced, the pipeline length will be shortened accordingly, the total heat loss of the pipeline length will be reduced accordingly, the number of corresponding drain joints will be reduced accordingly, and the heat loss generated by the drain joints will also be reduced. Under the condition of the same insulation diameter, the unit heat loss of nano aerogel, glass wool and polyurethane rigid foam insulation structure is 9.55% lower than that of aluminum silicate knitted blanket insulation plus glass wool insulation structure.

[0045] In addition, due to the reduction in the effective length of the heating network pipeline and the decrease in the heat loss of the pipe supports, the total heat loss of the heating network system is reduced by at least 15% compared with the traditional pipeline network.

[0046] 3. Calculate the material cost of DN500 overhead insulation pipe. The cost of aluminum silicate knitted blanket 50mm + glass wool 190mm + aluminum foil reflective cloth is 1173.72 yuan / meter. The cost of a set of rotary compensators is 180045 degree elbows × 2 + 236090 degree elbows × 4 + 4500 rotary compensators × 2 + 3020.6 short wall steel + 4500.18 short wall insulation material = 29560.78 yuan. If four sets of rotary compensators are set for 1000 meters, the total material cost is: 1173.72 × 1000 + 29560.78 × 4 = 1291963.12 yuan. If three sets of rotary compensators are reduced, the material cost is: 29560.78 × 3 = 88682.34 yuan. The material cost will be saved by 88682.34 / 1291963.12×100%=6.86%. Due to the increase in the distance between the two fixed joints, the number of fixed joints, continuous drains, rotary compensators, elbows, etc. on the main pipeline of the heat network can be reduced by 2 / 3-3 / 4, and the pipeline length can be reduced by about 3%. The above saves a lot of material costs and installation costs, and the total cost of the project can be saved by more than 10%.

[0047] From the above three points, we can see that we can make the thermal insulation effect of the heating network better, the heat loss lower, and the transmission distance longer without increasing the total project cost.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A heating network system capable of reducing heat loss and pipe support friction, comprising a working steel pipe (1), an outer protective jacket pipe (10), and an insulation layer (11) provided between the working steel pipe (1) and the outer protective jacket pipe (10); characterized in that: It also comprises an inner rolling pipe support (17), an intermediate support ring (9) and a composite thermal insulation structure layer (8); the intermediate support ring (9) is arranged between the working steel pipe (1) and the outer protective casing pipe (10); the thermal insulation layer (11) is arranged between the intermediate support ring (9) and the outer protective casing pipe (10); the rolling pipe support (17) and the composite thermal insulation structure layer (8) are arranged between the working steel pipe (1) and the intermediate support ring (9); a mounting space for the inner rolling pipe support (17) is reserved in the composite thermal insulation structure layer (8); the inner rolling pipe support (17) forms a rolling support for the bottom of the working steel pipe (1); The composite thermal insulation structure layer (8) comprises an inner skeleton support sleeve assembly (12), a first aluminum foil reflective layer (14), a nano-aerogel thermal insulation layer (13), a first aluminum foil reflective layer (14), a first thermal insulation layer (15), a second aluminum foil reflective layer (16), a second thermal insulation layer (18), a third aluminum foil reflective layer (19), a second thermal insulation layer (18), a third aluminum foil reflective layer (19), a third thermal insulation layer (21), an anti-convection thermal insulation layer (22), and an intermediate support sleeve (23), which are arranged in sequence from the inside to the outside; the heat resistance of the first aluminum foil reflective layer (14), the second aluminum foil reflective layer (16), and the third aluminum foil reflective layer (19) decreases in sequence; The inner frame support sleeve assembly (12) comprises a cylindrical steel wire mesh (24), an inner frame support roller (26) and an inner frame support roller shaft (27); the cylindrical steel wire mesh (24) and the working steel pipe (1) are arranged to be isolated from each other, the inner frame support roller shaft (27) is arranged on the cylindrical steel wire mesh (24), and the inner frame support roller (26) is arranged on the inner frame support roller shaft (27) and is in rolling contact with the outer circumferential surface of the working steel pipe (1); The inner rolling pipe support (17) comprises a roller (3), a support seat (7) and a roller shaft (4); the intermediate support ring (9) is sleeved on the outer periphery of the composite thermal insulation structure layer (8); the support seat (7) is arranged below the working steel pipe (1); the roller shaft (4) is arranged on the support seat (7); the roller (3) is arranged on the roller shaft (4) and forms rolling contact with the outer cylindrical bottom of the working steel pipe (1); the central axis of the roller shaft (4) is perpendicular to the central axis of the working steel pipe (1).

2. A heating network system capable of reducing heat loss and pipe support friction according to claim 1, characterized in that: The inner rolling tube support (17) further comprises a heat insulator (6), wherein the heat insulator (6) is arranged at the bottom of the inner wall of the intermediate support ring (9) to support the support seat (7).

3. A heating network system capable of reducing heat loss and pipe support friction according to claim 1, characterized in that: The inner rolling tube support (17) further comprises an inner support limiting ring (2); the inner support limiting ring (2) is sleeved on the outer circumference of the working steel tube (1) and connected to the support seat (7).

4. A heating network system capable of reducing heat loss and pipe support friction according to claim 1, characterized in that: The outer circumferential surface of the roller shaft (4) is provided with a friction-reducing coating (5).

5. A heating network system capable of reducing heat loss and pipe support friction according to claim 1, characterized in that: The outer circumferential surface of the roller (3) is a curved surface that matches the outer circumferential surface of the working steel pipe (1).

6. A heating network system capable of reducing heat loss and pipe support friction according to claim 1, characterized in that: When the working steel pipe (1) in the heating network system is arranged in a pier manner, the heating network system further comprises an overhead pipe support (29) arranged on the embedded steel plate (40) of the concrete pier (41); the overhead pipe support (29) is arranged at the axial position where the inner rolling pipe support (17) is located; the overhead pipe support (29) comprises an upper hoop (30), an upper hoop connecting ear fastening bolt (32), an upper hoop connecting ear (33), a lower hoop connecting ear (34), a lower hoop (36), a bottom plate supporting vertical plate (37) and a bottom plate base (38); an upper hoop connecting ear (33) is arranged at each end of the upper hoop (30), and a lower hoop (36) is arranged at each end of the lower hoop (36). a lower hoop connecting ear (34); the upper hoop (30) and the lower hoop (36) are arranged opposite to each other on the outer circumferential surface of the outer sheath tube (10) and are connected to the corresponding upper hoop connecting ear (33) and the lower hoop connecting ear (34) via the upper hoop connecting ear fastening bolts (32); the bottom plate supporting vertical plate (37) is arranged at the bottom of the lower hoop (36), and the bottom plate base (38) is arranged at the bottom of the bottom plate supporting vertical plate (37); a stainless steel drag reduction layer (42) is arranged between the bottom plate base (38) and the embedded steel plate (40), and the embedded steel plate (40) is provided with a radial limit block (43) and an axial limit block (44).

7. A heating network system capable of reducing heat loss and pipe support friction according to claim 1, characterized in that: When the working steel pipe (1) in the heating network system is arranged in a direct-buried manner, the heating network system further comprises an overhead pipe support (29) arranged on a sliding bottom plate (45) inside the directly-buried outer protective steel pipe (46); the overhead pipe support (29) comprises a bottom plate supporting upright plate (37) and a bottom plate base (38); the bottom plate supporting upright plate (37) is arranged at the bottom of the intermediate supporting ring (9), and the bottom plate base (38) is arranged at the bottom of the bottom plate supporting upright plate (37); a stainless steel drag reduction layer (42) is arranged between the bottom plate base (38) and the sliding bottom plate (45), and an axial limit block (44) is arranged on the sliding bottom plate (45).

8. A heating network system capable of reducing heat loss and pipe support friction according to claim 7, characterized in that: The directly buried outer protective steel pipe (46) and the outer protective casing pipe (10) are of the same pipe body.

9. A heating network system capable of reducing heat loss and pipe support friction according to claim 1, characterized in that: A polyurethane foam layer bracket (25) for fixing the thermal insulation layer (11) is provided between the intermediate support ring (9) and the outer sheath tube (10).

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