The Relationship between the Wall Temperature and the Boiling Rate of the Biomass Boiler Economizer and Calculation Program Design

Abstract

After the temperature medium voltage coal boiler changed to burn biomass, the quantity of the smoke greatly increased, the economizer heat increased and the boiling rate rose, which tends to cause the economizer’s tuber wall to overheat. In this article, the calculation formula of the economizer’s tube’s outside surface temperature and the average temperature are deduced based on the basic thermal law. Besides, by measuring the economizer’s wall temperature, the relation between the wall temperature and the boiling rate is attained and two limit boiling rate concepts which judge the safe work of the economizer are also put forward. What’s more, the window procedure which calculates the wall temperature and the limit boiling rate is also compiled. In the end, the authors summarize the rapid- increasing change rule of the wall temperature between the two limit boiling rates and hold that the biomass boiler boiling rate should be controlled below the first boiling rate.

Progress in theoretical study on constructal optimization of marine steam power plants

“…Liu等人 [118] 对增加经济器后的热电联产锅炉进行了能 量分析, 发现加装经济器后的锅炉燃料利用率大大提 高. Lv等人 [119] 给出了锅炉经济器管壁温度分布和管 壁平均温度的计算方法, 得到了管壁温度和工质吸热 速率间的关系. 刘祥源等人 [120] 在体积和重量不变的情 况下对船用锅炉经济器结构进行了改进, 发现经济器 采用方形翅片管后, 锅炉蒸汽产率大大增加, 同时烟 气流动阻力减小.…”