关键词: 纳米保温材料, PTA装置, 蒸汽管道, 二氧化硅, 气凝胶, 层下腐蚀, 复合保温, 经济效益,

Abstract:

The steam pipeline for the PTA(purified terephthalic acid) unit supplied by a certain company's power center includes medium pressure steam pipeline and high pressure steam pipeline. The design pressure of high pressure steam pipeline is 9.81 MPa, the design temperature are 545 ℃ and 380 ℃(temperature reduction), and the material of the pipeline is 12Cr1MoVG. The design pressure of the medium pressure steam pipeline is 4.5 MPa, the design temperature is 465 ℃, and the material of the pipeline is 12Cr1MoVG. The total length of high and medium pressure steam pipelines is about 5 000 meters. In order to ensure long-term stable steam supply, a new nano aerogel thermal insulation material+aluminum silicate composite thermal insulation scheme with lower thermal conductivity and high water repellency is adopted. After application, the measured thermal insulation effect is good, and the energy saving benefit is obvious through data calculation.

Key words: nano thermal insulation material, PTA unit, steam pipeline, silica, aerogel, under layer corrosion, composite thermal insulation, economic benefits,