直流锅炉水冷壁热敏感性的研究

Study on Thermal Sensitivity of Waterwall in Once-through Boiler

针对锅炉扰动工况下水冷壁的安全问题,根据汽液两相流阻力分相流模型,建立了直流锅炉水冷壁热敏感系数定量计算表达式,基于C++Builder分析程序研制了水冷壁热敏感特性分析软件.对1100 t/h直流锅炉水冷壁的热敏感系数进行了定量计算,并分析了热负荷、压力、质量流速等因素对流量敏感系数、压降敏感系数和出口焓敏感系数的影响规律.结果表明:在近临界压力区,锅炉热敏感性受外界扰动的影响最为剧烈.研究结果对防止水冷壁爆管,确保直流锅炉安全运行具有重要意义.

In the light of safety calculation expression for thermal the basis of separated flow model problem of boiler waterwall under sensitivity coefficient of waterwall in of liquid-gas two phase flow. A set disturbed conditions, quantitative once-through boiler was set up on of software for thermal sensitivity analysis of waterwall was developed by use of C＋＋ Builder analyse program. The thermal sensitivity coefficient of waterwall in an 1 100 t/h once-through boiler was quantitatively calculated. The influence law of heat load, pressure, mass flow rate, etc. on sensitivity coefficients of flow rate, pressure drop as well as outlet enthalpy was analyzed. Results show that the influence of environmental disturbs on thermal sensitivity of boiler is the largest near the zone of critical pressure. The study results have significant sense for preventing waterwall from burst and ensuring safe operation of the once-through boiler.