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Urban heat supply pipeline compensator

Time: 03-30 󰃯 Reading times: 754 󰃳 Editor in charge: The sea 󰃗 Column: product focus

Introduction: The urban heating pipe network is composed of pipes, movable supports, supports, compensators, gate valves, drainage pipes and air venting equipment. Besides, the working pressure, pipe weight, external load, temperature change and other factors of urban heating pipeline are analyzed

Urban heating pipe Compensator The urban heating pipe network is composed of pipeline, movable support, support frame, compensator, gate valve, drainage pipe and air release equipment. Under the effect of working pressure, pipe weight, external load, temperature change and other factors of urban heating pipeline, the ground stress changes such as stretching and bending can be caused by the pipe and its notes. Note: the key to the design of heating pipe network is to ensure the pipeline's thermal strength and toughness in the design stage.
After the pipeline heat compensation heating network is put into operation, the pipeline will be extended due to the heating effect of the heat medium in the pipeline. In order to ensure the stable and safe operation of the pipeline network under thermal conditions, it is necessary to set support frames in the thermal network, and set various compensators between the supports to weaken or remove the ground stress caused by thermal deformation, and control the thermal extension direction of the pipeline.
At the present stage, the common compensators in engineering are square compensator Casing compensator Spherical compensator Bellows compensator Etc. The standard of compensator: first of all, the natural compensation of pipeline bending should be considered. When the natural compensation can not meet the requirements, the square compensator, casing compensator, waveform compensator and bellows compensator should be set to compensate.
Square compensator square compensator is a kind of compensator which is widely used in heat supply network. The solid line represents the installation of the square compensator, and the dotted line represents the expansion of the pipeline in case of heat. The elastic force caused by pipeline deformation causes leveling resistance to the fixed support.
In the heat supply network, the mutual effect of friction caused by tension bolt and sliding friction caused by gas pressure effect. The size of sliding friction force caused by gas pressure is determined according to the condition. The spherical compensator uses the angular bending of the compensator sphere to absorb the thermal deformation of the pipeline. Two spherical compensators are matched into a group, which has the advantages of large compensation capacity (5-10 times larger than square compensator), small indoor space occupied, indoor space deformation and small steel consumption; the disadvantage is that the processing technology is strict.
The specification of spherical compensator: the outer diameter is dn40-dn 1000 mm; under general conditions, the larger pressure is not more than 1.5 MPa, and the unique production and manufacture can reach 2.5 CPA; under general conditions, the higher operating temperature is not higher than 280 ℃, and the unique production and manufacturing can reach 400 ℃; the larger bending angle is ± 15 °.
The urban heating pipeline compensator is composed of metal corrugated pipe, short pipe and other prefabricated components, which has the compensation ability. When working, it uses wavy deformation to compensate thermal deformation of pipeline, deformation of mechanical equipment and absorption damping vibration. Corrugated compensator It has the advantages of compact structure, small floor area, large compensation capacity, convenient installation, no functional water leakage, no maintenance and other advantages. In addition, it will not be limited by the working materials, main parameters, office environment and landform standards. In recent years, it has been widely used in Power Engineering, petrochemical, metallurgy, heating, concrete and other manufacturing industries.
Ripple compensator is divided into U shape, Ω shape, s shape and V shape according to the appearance of ripple. According to the corrugated pipe material is divided into stainless steel, carbon steel and composite materials, the city heating pipe often choose stainless steel. According to the compensation mode, it can be divided into radial displacement, transverse displacement, angular displacement and the combination of the three. Type: fixed type, radial offset type, radial offset type, radial type, radial offset type, radial type According to the total number of offset directions, it is divided into one-sided compensation and two-sided compensation. In boiling water directly buried pipeline, double-sided corrugated compensator is often used to absorb the two-sided expansion offset. According to whether the internal working pressure is equal or not, it can be divided into balanced and unbalanced bellows compensators. According to the cross-section of the compensator, it can be divided into annular and rectangular frame corrugated compensators. The rectangular frame compensator is mainly used in bottom pressure places, such as furnace drum and induced draft fan pipe.
There are many types of bellows compensators, so the compensation regulations of different pipelines in pipeline design scheme can be considered.