立式双层孔环模生物质压块机设计与试验

针对目前环模压块机存在生产率低、能耗高等问题,该文采用立式环模原理和双层孔环模结构,创新设计了双层孔模块及对应的压辊,双层环模模块两边线夹角8°,模孔偏心角4.3°,双模孔中心线夹角10°。样机完成后进行了生产性试验,结果表明:压块机生产率为2.39 t/h,吨料能耗55.86 k W·h/t,成型率为96%以上,成型密度为1.1 g/cm3以上,各项指标均达到设计及标准要求;对比于单层环模的立式环模生物质成型机生产参数,该创新设计的设备性能有所提高;设备自身下层环模与上层环模相比,成型率、生产率均有提高,差异不大。该立式双层环模压块机提高了生产率和产品质量,为中国生物质成型燃料产业化的发展提供装备保障。

Design and experiment of biomass briquetting machine with vertical double circular mould

Abstract: China is a large agricultural country with rich straw resources. According to the nationwide crop straw survey, although the annual amount of straw resources which can be collected is 687 million ton, the utilization rate can only reach 69%. Therefore, such situation leads to the resources waste, and irrational treatment can caused serious environmental pollution. Biomass briquetting fuels, which have the characteristics of excellent combustion performance and high production rate, can be suppressed by special equipment to block with a certain density. Therefore it can be one of the effective methods of the straw utilization. At present, the briquetting device applies the circular mould structure, and has the problems like low productivity and high energy consumption. Based on the vertical circular mould and double circular mould structures, this article designed new type of double mould and the corresponding pressure roller, had the work principle and main structures research, determined the main parameters of this kind of structure. The angle of the moulds was 8°, the die hole eccentric angle was 4.3°, dual bore centerline angle was 10°, and angles between two pressure rollers was 170°. The production test, applying this kind of equipment, whose material was furfural residue (moisture content and particle length were 26.2% and 6-0.15 mm, respectively) had been finished. The test results included becoming normal particles ratio of lower and upper mould, productivity, density, durability and energy consumption and so on. Test results indicated: The production rate of the briquetting machine was 2.39t/h, energy consumption per ton was 55.86kW·h/t, the ratio of becoming normal particles was more than 96%, and the particle density was more than 1.1 g/cm3. The indicators reached the requirements. Compared with production parameters of single circular mould briquette machine, this innovative device had better performance. Compared with the upper ring mould, the lower ring mould was better in the aspects of productivity and normal particles ratio, density and mechanical durability had the same level. This kind of double circular mould machine promoted the Chinese biomass solid fuel industrial development.