拉萨地区生活垃圾焚烧炉燃烧过程仿真及优化

Simulation and Optimization of Combustion Process of the MSW Incinerator in Lhasa

以拉萨地区某生活垃圾焚烧发电厂配套的500 t/d炉排炉为研究对象,分别运用FLIC和ANSYS FLUENT软件来模拟低气压条件下床层固相燃烧过程和炉膛气相组分燃烧过程,并将数值模拟结果与焚烧炉监测数据进行对比,模拟结果与监测数据吻合良好。验证了燃烧模拟方法的正确性后,对垃圾焚烧炉采取正交试验的方法进行配风优化模拟研究。经过方差分析,预测出锅炉处于最佳工况下的运行条件,并确定了影响锅炉运行的主要因素和次要因素为一、二次风量分配比例,一次风室风量分配和送风温度。在低气压环境下运行炉膛温度不满足要求时,优先调整一、二次风量比例和一次风室风量配比,在满足二次燃烧及对燃烧室内烟气扰动的前提下,适当减少二次风量,提高燃烧室烟气温度水平。

A 500 t/d grate furnace of a domestic waste incineration power plant in Lhasa was taken as the research object,FLIC and ANSYS FLUENT software were respectively used to simulate the bed solid-phase combustion process and furnace gas-phase component combustion process under low pressure conditions.The numerical simulation results were compared with the monitoring data of the power plant,and the simulation results were in good agreement with the test data.After verifying the correctness of the combustion simulation method,the orthogonal test method was adopted to carry out the optimization simulation research on the air distribution of the waste incinerator.Through variance analysis,the operating conditions of the boiler under the optimal working conditions were predicted,and the main and secondary factors affected the boiler operation were determined to be the distribution ratio of primary and secondary air volume,and the distribution of primary air volume and the supply air temperature,respectively.When the furnace temperature did not meet the requirements in low pressure environment,it was provided that the ratio of primary and secondary air volume and the ratio of primary air volume could be preferentially adjusted.On the premise of satisfying the secondary combustion and the disturbance to the flue gas in the combustion chamber,the secondary air volume could be appropriately reduced to improve the flue gas temperature level in the combustion chamber.