【摘要】 为提高秸秆热解气的净化率,防止装置堵塞,该研究设计了旋风分离器与回转指杆轮相结合的两级净化装置,I级旋风分离器主要分离热解气中大粒径杂质,II级指杆轮使小粒径灰尘、焦油等杂质与锥形指杆碰撞、聚集、并在高速回转作用下离心分离,实现热解气高效净化。研究确定了I级净化装置的结构参数,设计了II级净化装置,确定了指杆轮与锥形指杆的参数及排列方式。以指杆轮转速、热解气的进口速度和芯筒入筒体深度为影响因素,以热解气的净化率和压力损失为指标,进行了二次通用旋转组合样机性能试验。利用Design-Expert8.0.6软件对试验数据进行方差和响应面分析,建立了影响因素与指标之间的数学模型,采用多指标优化法确定最优组合并进行了试验验证。试验得到最优组合参数:指杆轮转速为3 030 r/min,进口速度为19.5 m/s,芯筒入筒体深度为210 mm,此时的压力损失为1 971.73 Pa,热解气总净化率为84.2%,达到了净化要求。研究结果可为秸秆热解气净化装置研究提供理论依据。更多还原

【Abstract】 Carbonization is one of the effective measures for utilization of straw. However, the tar and dust produced by carbonization are mixed in the pyrolysis gas, which will hinder the extraction and subsequent utilization of the flammable gases in the gas, and the tar may stick onto the inner wall of the device if the gas was not purified. And the air may be seriously polluted if it is vented into the air without purification. A two-stage purification device which consisted of a cyclone and a finger roller in its exhaust tunnel was designed in this study to improve the purification rate of carbonized flue gas, the structural parameters of the device were determined and the finger rod was designed. To get an efficient purification of the gas, the cyclone is the first stage which separates large particles in the gas by centrifugal force, and finger roller is the second stage which collides and gathers small particles into large particles and separates the particles along the taper finger by centrifugal force. The quadratic regression experiment with general rotary design method was carried out, with factors of the finger roller speed, the flue gas inlet speed and the core tube insert distance and with indicators of the flue gas purification rate and the pressure loss, the variance analysis and surface response analysis of the data were conducted with software Design-Expert8.0.6, and the mathematic models between the indicators and factors were established. The results showed that the three factors had significant effect on the purification rate and pressure loss of flue gas(P<0.01); The impact order of factors on pressure loss was as follows: finger roller speed > inlet gas speed >core tube insert distance, and the order of factors on purification rate was as follows: finger roller speed >inlet gas speed >core tube insert distance. As for effect of interaction of factors, the interactions of finger roller speed and inlet gas speed, inlet gas speed and core tube insert distance had significant effect on the pressure loss(P<0.01); the interaction of finger roller speed and inlet gas speed was extremely significant on purification rate(P<0.01). The optimal combinations of factors and levels were determined with optimization of multiple indices and verified through experiment. The optimal parameters were finger roller speed of 3 030 r/min, inlet gas speed of 19.5 m/s, insert tube distance of 210 mm, under the conditions, the pyrolysis gas pressure loss was 1 971.73 Pa, the purification rate was 84.2%. It can meet the requirements of pyrolysis gas purification of straw carbonization. This study may provide a reference for the development of pyrolysis gas purification device.更多还原