THE IMPROVEMENT OF THE DESIGN OF TWO-PHASE HEAT STABILIZER

Abstract

In the long-term perspective it is expected to continue active development of hydrocarbon fields in the north of Western Siberia in Tyumen Region and the Yamal Peninsula, located mainly in the zone of permafrost. The specifics of design and construction in the so-called permafrost is a special condition of soils. Frozen soils (permafrost soils) perceive the slightest heat load from constructions. Change the natural temperature field of frozen soils is a major factor in the revitalization of negative geocryological processes affecting the strength of foundations and bases. Thus, the reason of emergency conditions in addition to design errors and violations of construction technology in the construction of objects of oil and gas industry, in areas of permafrost becomes a violation of the natural temperature regime of the ground. In the last 25 years in the design, construction, operation and repair of objects of oil and gas complex and other constructions of industrial and civil use in permafrost widely used technology of thermal stabilization of permafrost soil bases and foundations as the most effective active method of engineering protection. Thermal stabilizers - biphasic thermosiphons seasonal activities are self-contained refrigeration units operating at the expense of low temperature air in the cold season with the accumulation of the cold in the ground for the summer period, and does not require any in-service costs. The paper presents the design of a vertical thermal stabilizer, which provides equable spreading of refrigerant around the perimeter of the inner wall of the device, the calculation and comparative analysis of the total thermal resistance of existing devices and thermal stabilizers of the proposed design. Calculations show that the efficiency of heat stabilizers, made of steel in the condition of equable spreading of refrigerant reaches indexes of thermostabilizers made of aluminum alloy.