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清华大学开发的炉排-循环床垃圾焚烧炉,具有掺煤比低、污染排放低、结构紧凑等优点。由于结构紧凑,其水冷壁水循环回路布置也相对复杂,特别是采用水冷旋风分离器,其内热流密度小,很容易产生停滞、倒流问题,影响锅炉运行的安全。该文通过计算表明:在受热弱的受热面内存在停滞和倒流的风险。而该炉型近5 a的运行表明没有因水循环事故而导致异常停机。尽管受热弱的受热面内有停滞和倒流的风险,但其辐射热流密度却非常低,因而水循环是安全的。
The grate-circulating bed waste incinerator developed by Tsinghua University has the advantages of low coal blending ratio, low pollution emission and compact structure. Due to its compact structure, the layout of the water circulation circuit of the water wall is relatively complicated. In particular, the use of a water-cooled cyclone separates the heat flux in the water circuit and causes problems of stagnation and backflow, thereby affecting the operation safety of the boiler. The paper shows that there is a risk of stagnation and backflow in the heated surface with weak heat. The nearly 5-year operation of the furnace showed no abnormal shutdown due to a water cycle accident. Despite the risk of stagnation and backflow in the heated, heated surfaces, the radiant heat flux is very low and the water cycle is safe.