CN211876082U - Spiral coil pipe structure for absorbing expansion difference between shell and heating surface - Google Patents

Abstract

Absorb casing and heating surface poor spiral coil pipe structure for expansion belongs to waste heat boiler technical field, the utility model discloses a solve to have the expansion difference between heating surface and the casing of present waste heat boiler, produce local stress easily, lead to the weak region of heating surface to take place to tear, leak the problem. Including pressure shell, be equipped with annular water-cooling wall in the pressure shell, annular water-cooling wall's bottom is equipped with annular header, annular header outer wall's bottom is equidistant to be equipped with a plurality of enhancement couplings, the circumference distributes on pressure shell's the outer wall and has the casing reinforcement pipe that corresponds with enhancement coupling quantity, the one end of spiral coil subassembly is through strengthening coupling and annular header intercommunication, the other end of spiral coil subassembly passes the casing reinforcement pipe and communicates through connecting pipe and the outside feed pipe entry of pressure shell. The utility model discloses an it can guarantee long-time, safe and reliable's continuous operation of equipment to absorb casing and heating surface expansion difference with spiral coil pipe structure.

Description

Spiral coil pipe structure for absorbing expansion difference between shell and heating surface

Technical Field

The utility model relates to a spiral coil pipe structure, concretely relates to spiral coil pipe structure for absorption casing and heating surface expansion difference belongs to waste heat boiler technical field.

Background

In recent years, with the rapid development of the coal chemical industry in China, the national requirements for improving the system efficiency and energy efficiency of coal conversion and reducing pollutant emission are higher and higher, and high-efficiency coal gasification technologies and systems are urgently needed in the industries of coal chemical industry, petroleum and the like. And adopt waste heat boiler process on traditional coal gasification technical basis, can retrieve the waste heat of synthetic gas, and then promote the system cycle efficiency of coal gasification process. Therefore, in industries such as coal chemical industry, it has become a main trend of development to install a waste heat boiler behind a gasification furnace.

For the waste heat boiler, a heating surface (a circular/polygonal water-cooled wall, a water-cooled screen and the like) is arranged inside a pressure shell of the waste heat boiler and hung on the pressure shell through the upper part to form a closed synthetic gas channel which directly contacts high-temperature synthetic gas for heat exchange; the pressure shell is only subjected to heat transmitted by the heated surface, and is insulated by a suitable refractory material. Therefore, there is a large temperature difference between the heated surface and the shell (the specific temperature difference is related to the temperature of the generated saturated/superheated steam and the synthesis gas). Meanwhile, due to the fact that the working environments of the heating surface and the shell are different, the selected materials are different, and the metal expansion coefficients are different. A large difference in free downward expansion is thus produced between the heating surface and the waste heat boiler housing. At present, because the expansion difference between a heating surface and a shell is not well solved, huge local stress is generated, and the weak area of the heating surface is torn and leaked, the normal and safe operation of equipment is influenced, and the boiler is forced to be shut down.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an absorb casing and heating surface differential expansion and use spiral coil pipe structure to there is the differential expansion between the heating surface of solving present exhaust-heat boiler and the casing, produce local stress easily, lead to the weak region of heating surface to take place to tear, leak the problem

The spiral coil pipe structure for absorbing expansion difference between the shell and the heating surface comprises a pressure shell, an annular water-cooling wall is arranged in the pressure shell, an annular header is arranged at the bottom end of the annular water-cooling wall, a plurality of reinforcing pipe joints are arranged at equal intervals at the bottom of the outer wall of the annular header, shell reinforcing pipes corresponding to the reinforcing pipe joints in quantity are distributed on the outer wall of the pressure shell in the circumferential direction, one end of a spiral coil pipe assembly is communicated with the annular header through the reinforcing pipe joints, and the other end of the spiral coil pipe assembly penetrates through the shell reinforcing pipes and is communicated with an inlet of a water supply pipe outside the.

Preferably: the spiral coil assembly is a plurality of spiral coils, and a plurality of spiral coils are arranged in a spiral manner, and spiral coil's one end is through strengthening coupling and annular header intercommunication, and the other end passes and strengthens the corresponding casing reinforcement pipe of coupling to through connecting pipe and the outside feed pipe entry intercommunication of pressure shell.

Preferably: the outer wall of the connecting pipe is provided with a clamping groove.

The utility model discloses compare with current product and have following effect:

the structure can adjust the pitch and the number of turns of the spiral coil according to the expansion difference condition of a specific application scene and the number of water supply leading-in pipes; the distance between the outer surfaces of the coil pipes is adjusted according to the deformation of the independent spiral coil pipes, so that interference is avoided when the expansion amount is absorbed in the operation process; the sizes of the header reinforcing pipe joint and the internal connecting pipe structural member can be adjusted according to the magnitude of the expansion amount counter force.

The method effectively solves a series of problems caused by the expansion difference between the shell and the heating surface, and ensures that the equipment can continuously run for a long time, safely and reliably; and the effect of reducing the overall height of the shell can be achieved, and the cost is reduced.

The spiral coil component increases the overall flexibility and compressibility, so that the expansion difference between the heating surface and the shell in a free downward direction can be effectively absorbed, and the local stress caused by high-temperature expansion difference and operation vibration is eliminated;

the header reinforced pipe joint eliminates the hidden trouble of pipe joint cracking caused by the action counter force of expansion difference, and the structure is safer;

the connecting pipe fully utilizes the structural characteristics of the U-shaped groove, can absorb the tensile stress generated by the downward expansion of the spiral coil pipe, reduces the local stress of the welding seam at the position, and avoids the common problem of weld seam tension crack of the existing equipment;

the spiral coil assembly is compact in structure, the height of the pressure shell of the equipment is effectively reduced, and the cost of the equipment is reduced; and the welding seam is few, reduces the weak link of whole structure.

Drawings

FIG. 1 is a schematic structural view of the suction side inside the movable blade main body of the spiral coil pipe structure for absorbing the expansion difference between the shell and the heating surface of the present invention;

FIG. 2 is an enlarged partial view of the pressure shell;

FIG. 3 is a schematic view of the structure of the connection pipe;

fig. 4 is a structural schematic view of the reinforced pipe joint.

In the figure: 1-pressure shell, 2-annular water-cooled wall, 3-annular header, 4-reinforced pipe joint, 5-spiral coil pipe, 6-shell reinforced pipe, 7-connecting pipe and 8-clamping groove.

Detailed Description

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1 to 4, the spiral coil pipe structure for the expansion difference between the absorption shell and the heating surface comprises a pressure shell 1, and an annular water cooling wall 2 is arranged in the pressure shell, and is characterized in that: the bottom of annular water-cooling wall 2 is equipped with annular header 3, and the bottom of 3 outer walls of annular header is equidistant to be equipped with a plurality of enhancement coupling 4, and the circumference distributes on pressure shell 1's the outer wall has the casing reinforcement pipe 6 that corresponds with enhancement coupling 4 quantity, and the one end of spiral coil assembly is passed through enhancement coupling 4 and annular header 3 intercommunication, and the other end of spiral coil assembly passes casing reinforcement pipe 6 and is passed through connecting pipe 7 and 1 outside feed pipe entry intercommunication of pressure shell.

Further: spiral coil pipe assembly is a plurality of spiral coil pipes 5, and a plurality of spiral coil pipes 5 spiral is arranged, and spiral coil pipe 5's one end is through strengthening coupling 4 and the 3 intercommunication of annular header, and the other end passes and strengthens coupling 4 corresponding casing reinforcement pipe 6 to through connecting pipe 7 and the outside feed pipe entry intercommunication of pressure housing 1.

Further: the outer wall of the connecting pipe 7 is provided with a clamping groove 8, and the clamping groove 8 is a U-shaped groove.

The spiral coil assembly is formed by mutually nesting N independent spiral coils (the number of the coils is determined according to the required flow area ratio) to form a structure similar to a spring, so that the whole pipe distribution space is saved, and finally, the spiral coil assembly is introduced into the header in different directions. The thread pitch and the number of turns of the independent spiral coil can be adjusted according to the expansion difference of a specific application scene and the number of water supply leading-in pipes (independent coils), and the local stress is ensured to meet the requirement. One end of the spiral coil pipe component is welded with the (header reinforced pipe joint), and the other end is welded with the connecting structural component of the internal connecting pipe.

The annular header is formed by bending pipes according to different central circle diameters into a ring shape, the upper part of the annular header is welded with the annular water cooling wall of the heating surface, and the lower part of the annular header is welded with the inlet reinforcing pipe of the header. The diameter of the central circle of the annular header can be adjusted according to the size of the heated surface.

One end of the header reinforcing pipe joint is welded with the annular header, and the other end of the header reinforcing pipe joint is butted with the spiral coil pipe. Because the pipe joint of the header needs to bear the counterforce caused by the difference of the absorption expansion amount of the spiral coil pipe, a section of reinforcing pipe needs to be arranged according to the stress analysis calculation result.

One end of the connecting pipe is in butt joint with the spiral coil pipe and the reinforcing pipe for the opening of the shell, and the other end of the connecting pipe is in butt joint with the inlet of the external water supply pipe. The butt joint of the internal connecting pipe structural part and the spiral coil pipe adopts a U-shaped groove structure, so that the local stress is reduced.

This embodiment is only illustrative of the patent and does not limit the scope of protection thereof, and those skilled in the art can make modifications to its part without departing from the spirit of the patent.

Claims (3)

1. Absorb casing and heating surface expansion difference and use spiral coil pipe structure, including pressure shell (1), be equipped with annular water-cooling wall (2), its characterized in that in the pressure shell: the bottom of annular water-cooling wall (2) is equipped with annular header (3), the bottom of annular header (3) outer wall is equidistant to be equipped with a plurality of enhancement coupling (4), the circumference distributes on the outer wall of pressure shell (1) has casing reinforcement pipe (6) that correspond with enhancement coupling (4) quantity, the one end of spiral coil pipe subassembly is through strengthening coupling (4) and annular header (3) intercommunication, the other end of spiral coil pipe subassembly passes casing reinforcement pipe (6) and through connecting pipe (7) and pressure shell (1) outside feed pipe entry intercommunication.

2. The absorption shell and heating surface differential expansion helical coil structure of claim 1, wherein: the spiral coil assembly is a plurality of spiral coils (5), and a plurality of spiral coils (5) are arranged spirally, one end of each spiral coil (5) is communicated with the annular header (3) through the reinforcing pipe joint (4), and the other end of each spiral coil (5) penetrates through the shell reinforcing pipe (6) corresponding to the reinforcing pipe joint (4) and is communicated with the external water supply pipe inlet of the pressure shell (1) through the connecting pipe (7).

3. The absorption shell and heating surface differential expansion helical coil structure of claim 1, wherein: and a clamping groove (8) is arranged on the outer wall of the connecting pipe (7).

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