Steam buried pipe conveying U-shaped pipeline compensator and mounting well thereof

Abstract

The invention discloses a steam buried pipe conveying U-shaped pipeline compensator and a mounting well thereof.The U-shaped pipeline compensator comprises U-shaped pipeline compensators arranged between two steam pipeline buried pipes at preset intervals, and each U-shaped pipeline compensator comprises two vertical parts and a horizontal part; the horizontal part is arranged between the two vertical parts, and elbow structures are arranged between the horizontal part and the vertical parts on the two sides and between the vertical parts and the steam pipeline buried pipes on the corresponding sides respectively. According to the steam buried pipe conveying U-shaped pipeline compensator and the installation well of the steam buried pipe conveying U-shaped pipeline compensator, the steam buried pipe conveying U-shaped pipeline compensator is designed from the engineering design economical principle, the compensator is placed in a drain valve overhaul well, and meanwhile a steam drain valve is installed in an overhaul well chamber; the overhaul well chamber has the advantages of being economical in construction, waterproof, suitable in overhaul space layout of the overhaul well, safe in ventilation of the overhaul well and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of buried pipes, and more specifically, to a U-shaped pipe compensator for conveying buried steam pipes and an installation well thereof. Background Art

[0002] There are two ways to transport steam through pipe networks. The first is overhead transport installation, and the second is underground transport construction. Overhead installation occupies the ground space of the factory or site, affecting the appearance of the factory or urban ground and occupying valuable space resources. Steam underground pipe transportation is the general trend of steam pipe network transportation.

[0003] At present, there are two problems that need to be solved in underground steam pipe transportation: First, the steam pipe network is buried underground. In order to prevent the change of steam pipe temperature from causing thermal expansion and contraction, and the safety hazard of cracking and deformation of the steam pipe network, it is necessary to install pipe temperature compensators at a distance of 30-50m to compensate for the deformation caused by temperature changes. However, traditional temperature compensators such as expansion joints are prone to cracking and leaking steam when there is a large temperature difference, such as when the steam supply is stopped in winter and the pipe is supplied at the same temperature as the soil. It is difficult to repair after being buried in the soil, and it is inconvenient to excavate the earth for maintenance. Second, for process steam, in order to ensure the quality of steam transportation and prevent the condensate generated during the steam transportation process from causing the "water hammer" phenomenon, it is also necessary to install steam condensate traps at a distance of 30-50m, but the traps also need regular maintenance and require a good maintenance space and environment.

[0004] Therefore, there is an urgent need for a U-shaped pipe compensator for underground steam transmission and an installation well thereof. Summary of the invention

[0005] The purpose of the present invention is to provide a U-shaped compensator for underground steam pipe transportation and an installation well thereof, so as to solve the problems in the above-mentioned prior art. Based on the principle of economic design of engineering, a U-shaped compensator for underground steam pipe transportation is designed. The compensator is placed in a steam trap inspection well, and the steam trap is also installed in the inspection well room. The inspection well room has the advantages of economical construction, waterproof inspection well, suitable inspection well inspection space layout, and safe ventilation of the inspection well.

[0006] The present invention provides a U-shaped pipe compensator for steam underground pipe transportation, which includes: a U-shaped pipe compensator arranged between two sections of steam pipeline underground pipes at preset intervals, each of the U-shaped pipe compensators respectively includes: two vertical parts and a horizontal part, the horizontal part is arranged between the two vertical parts, and elbow structures are respectively arranged between the horizontal part and the vertical parts on both sides, and between each vertical part and the steam pipeline underground pipe on the corresponding side.

[0007] As described above, in the U-shaped pipe compensator for underground steam transportation, preferably, the elbow structure comprises a 90-degree elbow.

[0008] The U-shaped pipe compensator for steam underground pipe transportation as described above, wherein, preferably, the spacing between two adjacent U-shaped pipe compensators is 30m-50m; each U-shaped pipe compensator is arranged in the horizontal direction; the outside of each U-shaped pipe compensator is coated with a compensator insulation layer, the compensator insulation layer adopts insulation cotton with a thickness of 95mm-105mm, and the outside of the compensator insulation layer is wrapped with a stainless steel skin with a thickness of 0.15mm-0.25mm.

[0009] As described above, the U-shaped pipe compensator for underground steam transportation, wherein, preferably, each of the vertical portions is welded to the underground steam pipe on the corresponding side.

[0010] The present invention also provides an installation well including the above-mentioned U-shaped pipe compensator for steam underground pipe transportation, wherein, preferably, there is an inspection well chamber, the U-shaped pipe compensator is installed in the inspection well chamber, a condensate recovery pipe underground pipe is arranged below the steam pipe underground pipe and the U-shaped pipe compensator, and a steam trap group is arranged between the steam pipe underground pipe on one side of the U-shaped pipe compensator and the condensate recovery pipe underground pipe.

[0011] The installation well for the U-shaped pipe compensator for conveying steam underground pipes as described above, wherein, preferably, the steam pipe underground pipe and the condensate recovery pipe underground pipe are jacketed pipes including a thermal insulation layer; the inner pipe and the outer pipe of the steam pipe underground pipe are all seamless carbon steel pipes, the interlayer is an insulation layer filled with thermal insulation material, and the outer surface of the outer pipe is anti-corrosive treated with paint and asphalt; the inner pipe and the outer pipe of the condensate recovery pipe underground pipe are filled with thermal insulation cotton to form an insulation layer, the inner pipe is made of stainless steel, and the outer pipe is made of carbon steel; the pre-buried depth of the steam pipe underground pipe is 0.95m-1.05m, the pre-buried depth of the condensate recovery pipe underground pipe is 1.45m-1.55m, and the excavation depth of the inspection well chamber is 1.65m-1.75m.

[0012] The installation well for the U-shaped pipe compensator for conveying steam underground pipes as described above, wherein, preferably, an inspection port and a ventilation port are provided on the top of the inspection well chamber, the inspection port and the ventilation port are respectively covered with well covers, and the inspection port and the ventilation port are diagonally distributed, and an inspection ladder extending to the bottom of the inspection well chamber is provided below the inspection port; a sump is provided at the bottom of the inspection well chamber directly below the inspection port.

[0013] The installation well for the U-shaped pipe compensator for steam underground pipe transportation as described above, wherein preferably, clay layers and fine sand layers are arranged on both sides of the exterior of the inspection well chamber from top to bottom, wherein the thickness of the clay layer is 0.71m-0.73m, and the thickness of the fine sand layer is 0.97m-0.99m;

[0014] The bottom and top of the inspection well chamber are of reinforced concrete structure; the walls of the inspection well chamber, the inspection port and the vent are of brick-concrete structure; the outer facade of the wall of the inspection well chamber is provided with a brick-concrete outer waterproof layer, the bottom surface of the inspection well chamber is provided with a well bottom waterproof layer, and the roof of the inspection well chamber is provided with a roof waterproof layer; the inspection port and the vent are circular in shape with a diameter of 0.6m-0.8m, and the brick-concrete structure hoops of the inspection port and the vent are provided with an outer ring waterproof layer; the manhole covers of the inspection port and the vent are 0.1m-0.2m higher than the outdoor floor.

[0015] The installation well of the U-shaped pipe compensator for conveying steam underground pipe as described above, wherein, preferably, the steam trap group includes a connecting pipe, on which are provided two ball valves, a pipe filter and a steam trap, wherein the pipe filter and the steam trap are arranged between the two ball valves, the pipe filter is arranged on a side close to the steam pipe underground pipe, and the steam trap is arranged on a side close to the condensate recovery pipe underground pipe; a condensate drain outlet is arranged at the connection between the steam pipe underground pipe and the connecting pipe, and a condensate confluence port is arranged at the connection between the condensate recovery pipe underground pipe and the connecting pipe.

[0016] The installation well of the U-shaped pipe compensator for conveying steam underground pipes as described above, wherein preferably, a pipe-through-the-wall waterproof filler layer is embedded in the gap where the steam pipeline underground pipe and the condensate recovery pipeline underground pipe pass through the wall;

[0017] The inspection well chamber is a cubic structure with a length of 2.4m-2.6m, a width of 2.4m-2.6m, and a height of 1.9m-2.1m. The horizontal spacing between the buried pipes of the steam pipe and the buried pipes of the condensate recovery pipe is 0.75m-0.85m, and the vertical spacing is 0.45m-0.55m.

[0018] The present invention provides a U-shaped pipe compensator for steam underground pipe transportation and an installation well thereof. Based on the principle of engineering design economy, U-shaped pipe compensators are arranged at certain intervals in the steam pipeline underground pipe, which can eliminate deformation and cracking caused by thermal expansion and contraction of the steam pipeline underground pipe. The compensator is installed in the maintenance well room to improve the ground environment and prevent the compensator from cracking due to resistance. In addition, long-distance steam transportation will also produce condensed water. The steam pipeline underground pipe needs to be installed with steam traps at certain distances to timely discharge harmful condensed water generated by heat dissipation and condensation in the steam transportation process. The steam trap needs to be regularly inspected and a maintenance well needs to be set up. At the same time, the steam trap group is also installed in the maintenance well room. The U-shaped pipe compensator is designed and installed at the same time as the maintenance well room, and the installation size and layout of the U-shaped pipe compensator are optimized to facilitate workers' maintenance and save construction project costs. The compensator has the advantages of economical construction, waterproof maintenance well, suitable maintenance space layout of maintenance well, safe ventilation of maintenance well, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0020] Figure 1 This is a schematic structural diagram of the U-shaped pipe compensator for underground steam transmission provided by the present invention.

[0021] Figure 2 A schematic diagram of the three-dimensional structure of an installation well embodiment of a U-shaped pipe compensator for underground steam pipe transportation provided by the present invention;

[0022] Figure 3 A schematic cross-sectional structure diagram of an embodiment of an installation well of a U-shaped pipe compensator for underground steam pipe transportation provided by the present invention;

[0023] Figure 4 A top view of an embodiment of an installation well of a U-shaped pipe compensator for underground steam pipe transportation provided by the present invention;

[0024] Figure 5 for Figure 4 AA section view;

[0025] Figure 6 for Figure 4 BB section view.

[0026] Explanation of the accompanying drawings: 1-condensate drain outlet, 2-connecting pipe, 3-ball valve, 4-pipe filter, 5-trap, 6-elbow structure, 7-condensate confluence, 8-maintenance well chamber, 9-U-type pipe compensator, 10-steam pipe buried pipe, 11-condensate recovery pipe buried pipe, 12-clay layer, 13-fine sand layer, 14-maintenance port, 15-ventilation port, 16-maintenance ladder, 17-sump, 18-brick-concrete outer waterproof layer, 19-well bottom waterproof layer, 20-outer ring waterproof layer, 21-insulation layer, 22-pipeline wall waterproof filler layer, 23-compensator insulation layer, 24-trap group, 25-roof waterproof layer. DETAILED DESCRIPTION

[0027] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0028] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprises" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] In the present disclosure, when a specific component is described as being located between a first component and a second component, there may or may not be an intermediate component between the specific component and the first component or the second component. When a specific component is described as being connected to other components, the specific component may be directly connected to the other components without an intermediate component, or may not be directly connected to the other components but have an intermediate component.

[0030] All terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0031] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0032] like Figure 1 As shown, the U-shaped pipe compensator for steam underground pipe transportation provided in this embodiment includes: a U-shaped pipe compensator 9 arranged between two sections of steam pipeline underground pipes 10 at preset intervals, each of the U-shaped pipe compensators 9 respectively includes: two vertical parts and one horizontal part, the horizontal part is arranged between the two vertical parts, and an elbow structure 6 is respectively arranged between the horizontal part and the vertical parts on both sides, and between each of the vertical parts and the steam pipeline underground pipe 10 on the corresponding side.

[0033] The elbow structure 6 comprises a 90-degree elbow, and the elbow structure 6 can reduce the steam transport resistance when changing the steam flow direction.

[0034] Furthermore, the distance between two adjacent U-shaped pipe compensators 9 is 30m-50m. Figure 1 In the figure, pipe B and pipe C are directly connected at an interval of 30m-50m, and the interval between the next U-shaped pipe compensator 9 and the previous U-shaped pipe compensator 9 is 30m-50m, for example, 40m.

[0035] Furthermore, each of the U-shaped pipe compensators 9 is arranged in the horizontal direction; the outside of each of the U-shaped pipe compensators 9 is coated with a compensator insulation layer 23, and the compensator insulation layer 23 adopts insulation cotton with a thickness of 95mm-105mm (for example, 100mm), and the outside of the compensator insulation layer 23 is wrapped with a stainless steel skin with a thickness of 0.15mm-0.25mm (for example, 0.2mm), so as to improve the convenience of maintenance.

[0036] Furthermore, each of the vertical portions is welded to the steam pipeline buried pipe 10 on the corresponding side.

[0037] like Figure 1 As shown, when the A section and the B section of the steam pipeline buried pipe 10 shrink and expand due to temperature changes, the temperature deformation variable Δδ of the U-shaped pipeline compensator 9 changes, so that the temperature deformation variable Δδ of the A section and the B section of the steam pipeline buried pipe 10 can be automatically adjusted by changing the L length of the U-shaped pipeline compensator 9.

[0038] In a specific implementation, a cut can be made between section A and section B of the steam pipe buried pipe 10, and a U-shaped pipe compensator 9 of the same pipe material and diameter can be inserted. The length L of the U-shaped pipe compensator 9 is as short as possible, and the height H of the U-shaped pipe is as long as possible to increase the deformation and reduce the occupied space.

[0039] The U-shaped pipe compensator for underground steam pipe transportation provided by the embodiment of the present invention has good ductility, is not subject to resistance, is durable, and is less prone to cracking and steam leakage than other types of expansion joints. It is maintenance-free and can be pre-buried in a pipeline well to reduce floor space and improve the ground environment.

[0040] Correspondingly, if Figure 2-Figure 6 As shown, the present invention also provides an installation well for a U-shaped pipe compensator for conveying steam underground pipes, comprising: an inspection well chamber 8, the U-shaped pipe compensator 9 is installed in the inspection well chamber 8, a condensate recovery pipe underground pipe 11 is arranged below the steam pipe underground pipe 10 and the U-shaped pipe compensator 9, and a steam trap group 24 is arranged between the steam pipe underground pipe 10 and the condensate recovery pipe underground pipe 11 on one side of the U-shaped pipe compensator 9.

[0041] In the present invention, the U-shaped pipe compensator 9 and the steam trap group 24 are placed in a maintenance well chamber 8 for design and construction, which can improve the construction economy of the steam transmission buried pipe, reduce engineering costs and civil construction costs. The design principle of the maintenance well is large maintenance operation space, good waterproofness and high safety.

[0042] The inspection well chamber 8 is a cubic structure with a length of 2.4m-2.6m (for example, 2.5m), a width of 2.4m-2.6m (for example, 2.5m), and a height of 1.9m-2.1m (for example, 2m) to minimize the design volume and reduce the civil construction cost. The horizontal spacing between the steam pipeline buried pipe 10 and the condensate recovery pipeline buried pipe 11 is 0.75m-0.85m (for example, 0.8m), and the vertical spacing is 0.45m-0.55m (for example, 0.5m).

[0043] The steam pipeline underground pipe 10 and the condensate recovery pipeline underground pipe 11 are arranged in the same direction, and steam and condensate flow in opposite directions in the steam pipeline underground pipe 10 and the condensate recovery pipeline underground pipe 11 respectively.

[0044] Further, the steam trap group 24 includes a connecting pipe 2, on which two ball valves 3, a pipe filter 4 and a steam trap 5 are arranged, wherein the pipe filter 4 and the steam trap 5 are arranged between the two ball valves 3, the pipe filter 4 is arranged on the side close to the steam pipe buried pipe 10, and the steam trap 5 is arranged on the side close to the condensate recovery pipe buried pipe 11. The steam trap group 24 is reserved in the maintenance well room 8, which is convenient for inspecting the pipe filter 4 and the steam trap 5. In the present invention, the connecting pipe 2 is a bending structure including two vertical pipes and one horizontal pipe, and the two ball valves 3, the pipe filter 4 and the steam trap 5 are all arranged on the horizontal pipe. Specifically, the ball valve 3 is a stop valve ball valve, and the steam trap 5 is a floating ball or buoy steam trap. A condensate drain port 1 is arranged at the connection between the steam pipe buried pipe 10 and the connecting pipe 2, and a condensate confluence port 7 is arranged at the connection between the condensate recovery pipe buried pipe 11 and the connecting pipe 2.

[0045] When condensate accumulates in the steam pipeline buried pipe 10, the condensate in the steam pipeline buried pipe 10 is pressed back into the condensate recovery pipeline buried pipe 11 through the steam trap group 24. When there is no condensate accumulated in the steam pipeline buried pipe 10, the steam trap group 24 is automatically closed, and the connecting pipe 2 is in a closed state. When the pipeline filter 4 and the steam trap 5 fail, the inspection well 8 can be entered for inspection. The U-shaped pipeline compensator 9 is arranged in the horizontal direction to leave space for inspection.

[0046] Furthermore, the steam pipe buried pipe 10 and the condensate recovery pipe buried pipe 11 are jacketed pipes including an insulation layer 21; the inner pipe and the outer pipe of the steam pipe buried pipe 10 are all seamless carbon steel pipes, the interlayer is an insulation layer 21 filled with insulation material, and the outer surface of the outer pipe is treated with paint and asphalt for corrosion protection; the inner pipe and the outer pipe of the condensate recovery pipe buried pipe 11 are filled with insulation cotton to form an insulation layer 21, the inner pipe is made of stainless steel, and the outer pipe is made of carbon steel pipe, and the thickness meets the national standard requirements for seamless steel pipes.

[0047] Furthermore, considering the economic efficiency of civil construction, the pre-buried depth of the steam pipeline buried pipe 10 is 0.95m-1.05m, for example, 1m, the pre-buried depth of the condensate recovery pipeline buried pipe 11 is 1.45m-1.55m, for example, 1.5m, and the excavation depth of the inspection well chamber 8 is 1.65m-1.75m, for example, 1.7m. It should be noted that the present invention does not specifically limit the depths of the steam pipeline buried pipe 10, the condensate recovery pipeline buried pipe 11, and the inspection well chamber 8.

[0048] Furthermore, an inspection port 14 and a vent 15 are provided at the top of the inspection well chamber 8, and the inspection port 14 and the vent 15 are respectively covered with manhole covers, and the inspection port 14 and the vent 15 are diagonally distributed, and an inspection ladder 16 extending to the bottom of the inspection well chamber 8 is provided below the inspection port 14, so that the inspection well chamber 8 can be manually entered and exited through the inspection ladder 16 at the inspection port 14 for inspection, thereby ensuring the safety of the staff; a sump 17 is provided at the bottom of the inspection well chamber 8 directly below the inspection port 14. When the rainy season comes and the inspection well chamber 8 is accidentally flooded, since the sump 17 is directly opposite to the inspection port 14, the drainage pump can be submerged into the sump 17 through the inspection port 14, and drainage operations can be carried out without people entering the inspection well chamber to drain the accumulated water in the inspection well chamber 8. During maintenance, spare parts, articles and materials can be hoisted and transported through the ventilation opening 15. The two openings of the inspection opening 14 and the ventilation opening 15 are distributed diagonally, which is conducive to good ventilation when the two manhole covers are opened, preventing workers from suffocating and ensuring the safety of the maintenance process.

[0049] During maintenance, close the steam source valve, open the inspection port 14 and the diagonally arranged ventilation port 15 on the ground of the inspection well chamber 8, and lower the submersible pump (if there is a lot of water accumulation) to the sump 17 through the inspection port 14 to drain the water in the well. Then go down into the inspection well chamber 8 through the inspection ladder 16, close the ball valves 3 before and after the steam trap 5 in the steam trap group 24, disassemble the steam trap 5 and the pipeline filter 4 to clean the rust residue, and ensure that the pipeline filter 4 and the steam trap 5 are not blocked by rust residue.

[0050] Furthermore, a clay layer 12 and a fine sand layer 13 are provided on both sides of the exterior of the inspection well chamber 8 from top to bottom, wherein the thickness of the clay layer 12 is 0.71m-0.73m, for example, 0.72m, and the thickness of the fine sand layer 13 is 0.97m-0.99m, for example, 0.98m.

[0051] Furthermore, the bottom and top of the inspection well chamber 8 are made of reinforced concrete structure, which is cast in one time; the wall of the inspection well chamber 8, the inspection port 14 and the wellhead barrel hoop of the vent 15 are made of brick-concrete structure, so as to save civil construction cost, reduce civil construction cost and improve the economy of civil construction. The outer facade of the wall of the inspection well chamber 8 is provided with a brick-concrete outer waterproof layer 18, the bottom surface of the inspection well chamber 8 is provided with a well bottom waterproof layer 19, and the roof of the inspection well chamber 8 is provided with a roof waterproof layer 25, which effectively prevents the clay layer 12 from seeping into the inspection well chamber 8; the inspection port 14 and the vent 15 are circular in shape, with a diameter of 0.6m-0.8m, for example, 0.7m; the outer ring waterproof layer 20 is provided outside the wellhead brick-concrete structure barrel hoop of the inspection port 14 and the vent 15, which can prevent the upper clay layer from seeping into the inspection well chamber 8 through the well hole brick-concrete structure. The brick-concrete outer waterproof layer 18, the well bottom waterproof layer 19, the room roof waterproof layer 25, and the outer circle waterproof layer 20 are made by leveling cement mortar and cement with a thickness of 15 mm, applying cold primer oil on the outside and laying waterproof membranes.

[0052] Furthermore, a pipeline through-the-wall waterproof filler layer 22 is embedded in the gaps through which the steam pipeline buried pipe 10 and the condensate recovery pipeline buried pipe 11 pass through the wall, which can prevent underground seepage from flowing into the inspection well chamber 8 through the gaps through the through-the-wall pipes.

[0053] Furthermore, the manhole covers of the inspection opening 14 and the ventilation opening 15 are 0.1m-0.2m higher than the outdoor floor, for example, 0.15m, to prevent rainwater from flowing back into the well. The present invention waterproofs the four walls, bottom surface, wellhead, and through-chamber pipes of the inspection well chamber 8, and the manhole cover is higher than the outdoor floor, which can prevent rainwater from flowing into or infiltrating into the inspection well chamber 8 to the greatest extent.

[0054] The U-shaped pipe compensator 9 and the steam trap group 24 of the present invention are designed and constructed in a maintenance well chamber 8, which can improve the construction economy of the steam transmission buried pipe and has the advantages of large maintenance operation space, good waterproofness and high safety.

[0055] like Figure 5 As shown, at a buried depth of 1 m, steam passes through the steam pipe buried pipe 10 from the left side over the wall into the inspection well chamber 8, and passes through the horizontally arranged U-shaped pipe compensator 9 over the wall out of the inspection well chamber 8 from the right side. The U-shaped pipe compensator 9 is 1 m deep from the ground.

[0056] like Figure 5 As shown, at a buried depth of 1.5 m, the buried pipe 11 of the condensate recovery pipeline goes over the wall into the inspection well chamber 8, and directly exits the inspection well chamber 8 from the right side. The buried pipe 11 of the condensate recovery pipeline is 1.5 m deep from the ground;

[0057] When water accumulates in the steam pipeline buried pipe 10, condensate is directed through the connecting pipe 2 at the bottom of the steam pipeline buried pipe 10 through the steam trap group 24 to the condensate recovery pipeline buried pipe 11 arranged below the steam pipeline buried pipe 10. Through the condensate recovery pipeline buried pipe 11, relying on the back pressure generated by the steam trap group 24, the condensate is transported over a long distance to the condensate recovery tank or recovery pipe to realize heat energy recovery.

[0058] The present invention is suitable for underground transportation of high-quality steam in industrial enterprises and underground pipe installation projects for municipal steam heating transportation. The size of the inspection well 8 is designed based on the diameter of the steam supply pipeline of 133 mm as an example. Other inspection wells with diameters higher than the diameter can be scaled proportionally.

[0059] The U-shaped pipe compensator for steam underground pipe transportation and its installation well provided in the embodiment of the present invention are based on the principle of engineering design economy. U-shaped pipe compensators are arranged at certain intervals in the steam pipeline underground pipe, which can eliminate deformation and cracking caused by thermal expansion and contraction of the steam pipeline underground pipe. The compensator is installed in the inspection well room to improve the ground environment and avoid cracking of the compensator due to resistance. In addition, long-distance steam transportation will also produce condensed water. The steam pipeline underground pipe needs to be installed with steam traps at certain distances to timely discharge harmful condensed water generated by heat dissipation and condensation during the steam transportation process. The steam trap needs to be regularly inspected and an inspection well needs to be set up. At the same time, the steam trap group is also installed in the inspection well room. The U-shaped pipe compensator is designed and installed at the same time as the inspection well room, and the installation size and layout of the U-shaped pipe compensator are optimized to facilitate workers' maintenance and save construction project costs. It has the advantages of economical construction, waterproof inspection well, suitable inspection space layout of inspection well, and safe ventilation of inspection well.

[0060] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0061] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A U-shaped pipe compensator for underground steam transmission, characterized in that: include: U-shaped pipe compensators are arranged between two sections of steam pipeline buried pipes at preset intervals, and each of the U-shaped pipe compensators includes: two vertical parts and a horizontal part, the horizontal part is arranged between the two vertical parts, and elbow structures are respectively arranged between the horizontal part and the vertical parts on both sides, and between each vertical part and the steam pipeline buried pipe on the corresponding side.

2. The U-shaped pipe compensator for underground steam transportation according to claim 1 is characterized in that: The elbow structure includes a 90-degree elbow.

3. The U-shaped pipe compensator for underground steam transportation according to claim 1 is characterized in that: The distance between two adjacent U-shaped pipe compensators is 30m-50m; each U-shaped pipe compensator is arranged in the horizontal direction; the outside of each U-shaped pipe compensator is covered with a compensator insulation layer, the compensator insulation layer adopts insulation cotton with a thickness of 95mm-105mm, and the outside of the compensator insulation layer is wrapped with a stainless steel skin with a thickness of 0.15mm-0.25mm.

4. The U-shaped pipe compensator for underground steam transportation according to claim 1 is characterized in that: Each of the vertical portions is welded to the steam pipeline buried pipe on the corresponding side.

5. An installation well comprising the U-shaped pipe compensator for underground steam transmission according to any one of claims 1 to 4, characterized in that: include: An inspection well chamber, wherein the U-shaped pipe compensator is installed in the inspection well chamber, an underground pipe of a condensate recovery pipe is arranged below the underground pipe of the steam pipe and the U-shaped pipe compensator, and a drain valve group is arranged between the underground pipe of the steam pipe and the underground pipe of the condensate recovery pipe on one side of the U-shaped pipe compensator.

6. The installation well of the U-shaped pipe compensator for underground steam transportation according to claim 5 is characterized in that: The buried pipes of the steam pipeline and the buried pipes of the condensate recovery pipeline are jacketed pipes including insulation layers; the inner pipe and the outer pipe of the buried pipe of the steam pipeline are all seamless carbon steel pipes, the interlayer is an insulation layer filled with insulation material, and the outer surface of the outer pipe is treated with paint and asphalt for corrosion protection; the inner pipe and the outer pipe of the buried pipe of the condensate recovery pipeline are filled with insulation cotton to form an insulation layer, the inner pipe is made of stainless steel, and the outer pipe is made of carbon steel; the pre-buried depth of the buried pipe of the steam pipeline is 0.95m-1.05m, the pre-buried depth of the buried pipe of the condensate recovery pipeline is 1.45m-1.55m, and the excavation depth of the inspection well chamber is 1.65m-1.75m.

7. The installation well of the U-shaped pipe compensator for underground steam transportation according to claim 5 is characterized in that: An inspection port and a ventilation port are provided on the top of the inspection well chamber, the inspection port and the ventilation port are respectively covered with well covers, and the inspection port and the ventilation port are diagonally distributed, and an inspection ladder extending to the bottom of the inspection well chamber is provided below the inspection port; a sump is provided at the bottom of the inspection well chamber directly below the inspection port.

8. The installation well of the U-shaped pipe compensator for underground steam transportation according to claim 7 is characterized in that: A clay layer and a fine sand layer are arranged on both sides of the exterior of the inspection well chamber from top to bottom, wherein the thickness of the clay layer is 0.71m-0.73m, and the thickness of the fine sand layer is 0.97m-0.99m; The bottom and top of the inspection well chamber are of reinforced concrete structure; the walls of the inspection well chamber, the inspection port and the vent are of brick-concrete structure; the outer facade of the wall of the inspection well chamber is provided with a brick-concrete outer waterproof layer, the bottom surface of the inspection well chamber is provided with a well bottom waterproof layer, and the roof of the inspection well chamber is provided with a roof waterproof layer; the inspection port and the vent are circular in shape with a diameter of 0.6m-0.8m, and the brick-concrete structure hoops of the inspection port and the vent are provided with an outer ring waterproof layer; the manhole covers of the inspection port and the vent are 0.1m-0.2m higher than the outdoor floor.

9. The installation well of the U-shaped pipe compensator for underground steam transportation according to claim 5 is characterized in that: The steam trap group includes a connecting pipe, on which are provided two ball valves, a pipe filter and a steam trap, wherein the pipe filter and the steam trap are arranged between the two ball valves, the pipe filter is arranged on a side close to the steam pipe buried pipe, and the steam trap is arranged on a side close to the condensate water recovery pipe buried pipe; a condensate drain outlet is arranged at the connection between the steam pipe buried pipe and the connecting pipe, and a condensate confluence port is arranged at the connection between the condensate water recovery pipe buried pipe and the connecting pipe.

10. The installation well of the U-shaped pipe compensator for underground steam transportation according to claim 5, characterized in that: A pipeline-through-the-wall waterproof filler layer is embedded in the gap between the buried pipe of the steam pipeline and the buried pipe of the condensate recovery pipeline passing through the wall; The inspection well chamber is a cubic structure with a length of 2.4m-2.6m, a width of 2.4m-2.6m, and a height of 1.9m-2.1m. The horizontal spacing between the buried pipes of the steam pipe and the buried pipes of the condensate recovery pipe is 0.75m-0.85m, and the vertical spacing is 0.45m-0.55m.

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