Composite thermal insulation structure of large chromium-molybdenum steel reactor and thermal insulation method thereof

Abstract

The invention belongs to the field of thermal insulation equipment for chemical tower outer walls, and discloses a composite thermal insulation structure of a large chromium-molybdenum steel reactor and a thermal insulation method of the composite thermal insulation structure. Inner straps are divided into upper inner straps (2) and lower inner straps (4) longitudinally, the upper ends of the upper inner straps (2) are fixed on a fixing ring (102) at the upper end of the reactor (1), the upper inner straps (2) and the lower inner straps (4) are connected in a longitudinally staggered mode through hoops (3) with which the outer wall of the reactor (1) is sleeved, the lower ends of the lower inner straps (4) are fixedly connected to the bottom of the reactor (1), each hoop (3) is composed of a plurality of sections of arc-shaped segments (301) and arc-shaped casing pipes (302), the arc-shaped segments (301) are arranged in an end-to-end spaced mode, and the end portions of the ends of the adjacent arc-shaped segments (301) are sleeved with the casing pipes (302) in a movable mode. According to the thermal insulation method utilizing the structure, the upper inner straps (2) and the lower inner straps (4) are arranged in the staggered mode through the hoops so as to accommodate a multi-opening structure of the large reactor.

Description

technical field [0001] The invention relates to a composite thermal insulation structure of a large chromium molybdenum steel reactor and a thermal insulation method thereof, belonging to the field of thermal insulation equipment for outer walls of chemical towers, in particular to an external thermal insulation structure of large chromium molybdenum steel reactor equipment. Background technique [0002] The reactor is a thermal fatigue pressure vessel. Because of its high design pressure and temperature, thermal expansion and contraction will occur. Therefore, external thermal insulation protection is required for its outer surface. The invention 201020530512.6 applied by the applicant discloses a hanging thermal insulation structure , adopts a non-welded steel inner strap structure, does not need to weld prefabricated parts on the outer wall of the reactor, and solves the problem of crack sources caused by welding prefabricated parts on the outer wall of the reactor wall, b...

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Problems solved by technology

[0002] The reactor is a thermal fatigue pressure vessel. Because of its high design pressure and temperature, thermal expansion and contraction will occur. Therefore, external thermal insulation protection is required for its outer surface. The invention 201020530512.6 applied by the applicant discloses a hanging thermal insulation structure , adopts a non-welded steel inner strap structure, does not need to weld prefabricated parts on the outer wall of the reactor, and solves the problem of crack sources caused by welding prefabricated parts on the outer wall of the reactor wall, but this inner strap is a whole piece from the reactor The top extends all the way to the bottom of the reactor and is tensioned by a spring. With the enlargement of the production device, the reactor equipment has become larger and more complicated, and there are many pipes and openings outside the wall. Some current reactors The number of openings outside the wall has reached hundreds, and with the needs of modern technology, the reactor becomes larger and thicker, and multiple prefabricated parts need to be welded on the outside. The openings and prefabricated parts above cannot meet the insulation requirements of this reactor

[0003]The diameter of the large-scale chrome-molybdenum steel reactor can reach 10m, the height can reach 60m, and the number of openings is large. Because the process requires the openings to be staggered on the outer wall of the reactor, this results in The straps cannot be pulled directly from the top of the reactor to the lower end of the reactor. In order to avoid the opening and expose the opening to the thermal insulation structure, the inner straps must be staggered longitudinally at the opening. In order to ensure the thermal insulation effect, the inner straps must be close to the outer wall of the reactor. The temperature of the reactor will change greatly during use, which causes the outer wall of the reactor to expand with heat and contract with cold. The inner strap must be able to move with the outer wall of the reactor at the connection point of thermal expansion and contraction, and always keep close to the outer wall of the reactor. , at the same time, it can transmit the tension between the upper and lower inner straps. At present, there is no large-scale reactor insulation structure that can effectively solve this problem.

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