响应面法分析优化晚松生物质成型燃料制备工艺

Optimization of the manufacturing process of Pinus rigida briquette by response surface methodology

晚松在生物质能源利用方面具有优良的性能,笔者以晚松生物质成型燃料的密度为主要研究对象,探讨温度(A)、含水率(B)、颗粒平均直径(C)、压力(D)4个因素及因素间交互作用对密度的影响,通过响应面优化法得到了晚松生物质成型燃料的密度取极大值时所对应的较佳制备工艺,并验证在此制备工艺下的抗碎强度是否达到要求。结果表明:温度、含水率、颗粒平均直径、压力4个因素对晚松生物质成型燃料密度的影响都达到极显著水平,交互项AB、AC、BC的影响也达到极显著水平,各因素都是通过对晚松颗粒的流动性产生影响,进而对成型燃料密度产生交互作用。晚松生物质成型燃料密度取极大值时对应的较佳工艺为:温度131℃,含水率10.42%,颗粒平均直径1.0 mm,压力65 MPa;在此条件下得到的成型燃料平均密度约为1.02 g/cm3,平均抗碎强度为98.86%,达到生物质成型燃料标准的要求。

Pinus rigida is a fast-growing species with high biomass yield. It can grow well in barren soil and in mountainarea and is believed to be a good raw material to prepare biomass. It is a basic utilizat1ion way of Pinus rigida to makebriquette, the quality of which has close relationship with temperature, moisture content, average particle diameter andpressure. In order to find out the best manufacturing process ofpinus rigida briquette, this paper studied the relationshipbetween briquette density and temperature （A）, moisture content （ B）, average particle diameter （C） and pressure （D）by four single factor experiments. Based on these experiments, a multi-factor response surface experiment was designedto build a formula describing the relationship between density and the four factors, and the interaction of the four factorswas analyzed by ANOVA. All these experimental data were analyzed by design-expert 8.0 software. The results showedthat the influence of temperature, moisture, average particle diameter and pressure, and the interaction of AB, AC, BCwas very significant. In order to insure the Pinus rigida briquette density to reach the requirement of national standard（ 1.0 g/cm3） , the target density was set at 1.02 g/cm3. Through the analysis of design-expert 8.0 software, the bestpreparation technology for Pinus rigida briquette was 131 ℃ for temperature, 10.42% for moisture content, 1.0 mm foraverage particle diameter and 65 MPa for pressure. The density and crushing strength obtained under these conditionswere up to 1. 019 g/cmz and 98.86%, respectively. These two indicators reached the requirements of the national stand-ard for briquette.