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CN-121993684-A - Heat preservation heat tracing pipeline installation method

CN121993684ACN 121993684 ACN121993684 ACN 121993684ACN-121993684-A

Abstract

A method for installing a heat-preservation heat-tracing pipeline. The invention belongs to the technical field of pipeline heat preservation and heat tracing, and particularly relates to a heat preservation and heat tracing structure installation method of a high-temperature pipeline of a sulfur recovery device, which comprises the steps of firstly preprocessing the surface of the pipeline, then starting welding a supporting piece group, then starting installation of a heat tracing system, then coating a galvanized electric welding net, then starting installation of a heat preservation layer, and finally performing assembly of an outer protective layer, wherein a unique heating space is formed according to the steps, so that the inner wall of the heat preservation layer is separated from the outer wall of the high-temperature process pipeline and the heat tracing pipe by a relatively static air layer, thereby effectively reducing heat loss and improving heat tracing efficiency; the natural convection of the air in the heating space can also lead the circumferential temperature of the pipeline to be more uniform, thereby improving the energy-saving effect.

Inventors

  • CAI WEIZHONG
  • SUN MINCHAO
  • LIN XIAOFENG
  • LV WEIPING

Assignees

  • 中化二建集团有限公司

Dates

Publication Date
20260508
Application Date
20260330

Claims (10)

  1. 1. The heat preservation heat tracing pipeline installation method is characterized by comprising the following steps of: step one, cleaning the outer surface of a process pipeline (1); Step two, welding a support piece group: Arranging angle steels (3) along the axial direction and the circumferential direction of the process pipeline (1), fixing the angle steels (3) on the process pipeline (1) by adopting double-sided fillet welding, welding annular flat steels (4) on the tops of the angle steels (3) which are circumferentially arranged on the same section, and forming an annular supporting frame together by the angle steels (3) and the annular flat steels (4); Step three, installing a heat tracing system: The heat tracing pipe (2) is circumferentially arranged along the outer wall of the process pipeline (1), the heat tracing pipe is temporarily fixed by using a fixing piece, a gap between the heat tracing pipe (2) and the outer wall of the process pipeline (1) is ensured during fixing, and the heat tracing pipe (2) is positioned at the inner side of the supporting frame; Step four, installing an electric welding net (5): Binding a layer of galvanized electric welding net (5) on the outer side of the support piece circumferential flat steel (4); fifthly, installing an insulating layer (6): the outer side of the electric welding net is wrapped by composite aluminum silicate products in a layered manner and is installed in a staggered joint manner to form an insulating layer (6); And step six, installing an outer protective layer (7).
  2. 2. The method according to claim 1, wherein in the second step, the angle steel (3) is axially spaced by 1 meter along the process pipe (1) and circumferentially arranged at an angle of 30 °.
  3. 3. The method according to claim 1 or 2, wherein in the second step, the angle steel (3) has a specification of +.50x32x3 (50 mm long side width, 32mm short side width, 3mm angle steel thickness).
  4. 4. The method of claim 3, wherein in the second step, the circumferential flat steel (4) is made of Q235 material and has a thickness of 3mm.
  5. 5. The method according to claim 1, wherein in the third step, the heat tracing pipe (2) is a steam heat tracing pipe.
  6. 6. The method according to claim 5, wherein in the third step, the heat tracing pipe (2) is arranged along the process pipe (1) at a circumferential arrangement angle of 90 ° or 120 °, and a gap distance between the heat tracing pipe and the outer wall is maintained at 15-20mm.
  7. 7. The method of claim 6, wherein in the third step, the fixing members are stainless steel pipe clamps or high-resistant Wen Zadai, and the arrangement interval of the fixing members is not more than 600mm.
  8. 8. The method of claim 1, wherein in the fourth step, the galvanized electric welding net (5) has a pore diameter of 1.2mm, 20# galvanized iron wires are adopted to bind at intervals of 200mm, and double-layer wrapping treatment is adopted at the lap corners.
  9. 9. The method according to claim 1, wherein in the fifth step, the thickness of each layer of the heat-insulating layer (6) is controlled to be 40-50mm, and the joint is sealed by adopting a high-temperature adhesive.
  10. 10. The method according to claim 9, wherein in the sixth step, the outer protective layer (7) is a 3003 aluminum alloy sheet with a thickness of 0.8mm and is installed by means of a snap-fit connection.

Description

Heat preservation heat tracing pipeline installation method Technical Field The invention belongs to the technical field of heat preservation and heat tracing of pipelines, and particularly relates to a heat preservation and heat tracing structure installation method of a high-temperature pipeline of a sulfur recovery device. Background The sulfur recovery device is provided with a part of process gas pipelines and tail gas pipelines, can be used as a switching channel between different treatment series and a discharge channel when the device is started and stopped, and has no continuous flow characteristic of internal media. Because sulfur vapor possibly remains in the pipeline, even if no medium flows, the temperature of the pipe wall is required to be maintained to be higher than the freezing point of elemental sulfur (usually not lower than 120 ℃) so as to prevent the problems of condensation, solidification accumulation, pipeline blockage, inner wall corrosion, difficult device startup and the like of the sulfur vapor, and ensure the long-term stable operation of the pipeline. In the prior art, such as jacket heat tracing, inner heat tracing or conventional outer heat tracing, heat tracing pipes are generally laid against the outer wall of a process pipeline and wrapped with an insulating layer. The heat is easy to be emitted through the heat insulation material, the heat loss is high, the efficiency is low, the heat tracing pipe and the process pipeline are in contact conduction heat transfer, the effect is obviously influenced by the contact tightness degree, uneven circumferential temperature distribution of the pipeline is easy to be caused, the integral temperature cannot be ensured to meet the sulfur solidification prevention requirement, and the heat tracing steam parameter is required to be improved or the specification of the heat tracing pipe is increased to maintain the pipe wall temperature, so that the energy consumption is high. Therefore, it is important to adopt an improved installation method in terms of reducing heat loss, improving heat tracing efficiency, ensuring uniform temperature in the circumferential direction of the pipeline and saving energy. Disclosure of Invention The invention aims to solve the technical problem of providing a heat-preservation heat-tracing pipeline installation method to reduce heat loss, improve heat tracing efficiency, ensure uniform temperature of the pipeline in the circumferential direction and improve energy-saving effect. In order to solve the technical problems, the invention adopts the technical scheme that the method for installing the heat preservation heat tracing pipeline is characterized by comprising the following steps: Step one, cleaning the outer surface of a process pipeline; Step two, welding a support piece group: Arranging angle steels along the axial direction and the circumferential direction of the process pipeline respectively, fixing the angle steels on the process pipeline by adopting double-sided fillet welding, welding annular flat steels on the tops of the angle steels which are circumferentially arranged on the same section, and forming an annular supporting frame together by the angle steels and the annular flat steels; Step three, installing a heat tracing system: The heat tracing pipes are circumferentially arranged along the outer wall of the process pipeline, and are temporarily fixed by using fixing pieces, so that gaps between the heat tracing pipes and the outer wall of the process pipeline are ensured during fixing, and the heat tracing pipes are positioned at the inner side of the supporting frame; step four, electric welding net installation: binding a layer of galvanized electric welding net on the outer side of the flat steel by the support piece in a circumferential manner; fifthly, installing an insulating layer: The outer side of the electric welding net is wrapped by composite aluminum silicate products in a layered manner and is installed in a staggered joint manner, so that an insulating layer is formed; Step six, installing an outer protective layer; Further, in the second step, the angle steel is axially spaced by 1 meter along the process pipeline, and the circumferential arrangement angle is 30 degrees; in the second step, the specification of the angle steel (3) is 50 multiplied by 32 multiplied by 3 (the width of the long side is 50mm, the width of the short side is 32mm, and the thickness of the angle steel is 3mm; in the second step, the specification of the annular flat steel is Q235 material, and the thickness is 3mm; Further, in the third step, the heat tracing pipe is a steam heat tracing pipe; further, in the third step, when the heat tracing pipe is arranged along the process pipeline, the circumferential arrangement angle is 90 degrees or 120 degrees, and the gap distance between the heat tracing pipe and the outer wall is kept to be 15-20mm; Further, in the third step, the fixing piece is