关键词: LNG储罐, 承台电伴热, 并联恒功率, 自限温, 温控

Abstract:

Compared with the traditional high layout of LNG storage tanks, the low layout of LNG storage tank cap can save a lot of project construction cost, but it needs to consider the cap electric heat tracing. The advantages and disadvantages of parallel constant power and temperature self-limiting temperature are compared and analyzed. Combined with the thermal insulation and environmental data of 200 dam³ LNG storage tank cap structure in a coastal project, one-dimensional steady thermal conductivity method is used to calculate and analyze the heat tracing power needed for the cap, and then the appropriate electric tracing belt is selected.Then it compares and analyzes the traditional RTD temperature measurement control and optical fiber distributed temperature measurement schemes, analyzes the distribution circuit in the design of distribution and electricity consumption, design institute and supplier design division of labor, and finally gives the reference quantities of electrical design. It has reference significance for the design of electric heat tracing at the bottom of similar LNG tanks.

Key words: LNG storage tank, cap electrical heat tracing, parallel constant power, temperature self-regulating, temperature control