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　　气力输送是以管道中流动的气体为载体输送颗粒的装置。气力输送的基本条件有两个：

　　Pneumatic conveying is a device that uses gas flowing in a pipeline as a carrier to transport particles. There are two basic conditions for pneumatic conveying:

　　（1）在圆管中输送；

　　(1) Transporting in a circular tube;

　　（2）以流动的气体为载体。前者能保证颗粒获得最小的圆周流动截面，后者能给颗粒提供动力。

　　(2) Using flowing gas as a carrier. The former can ensure that the particles obtain the minimum circumferential flow cross-section, while the latter can provide power to the particles.

　　根据管道内空气压力本质上的区别，气力输送分为正压气力输送和负压气力输送，正压蜜臀国产在线观看中的气体压力高于大气压力，负压蜜臀国产在线观看中的气体压力低于大气压力，而根据物料与气体的量比，分为罗茨风机稀相正负压输送，仓泵，础痴泵（灰槽泵）等浓相正输送。稀相粉尘质量浓度小于5kg/m3，浓相大于25kg/m3。以罗茨风机作为气源为例，它的输送为稀相输送，今天小编就讲一下它正负压输送特点：

　　According to the essential difference in air pressure inside the pipeline, pneumatic conveying is divided into positive pressure pneumatic conveying and negative pressure pneumatic conveying. The gas pressure in the positive pressure pneumatic conveying system is higher than atmospheric pressure, while the gas pressure in the negative pressure pneumatic conveying system is lower than atmospheric pressure. According to the ratio of material to gas, it is divided into lean phase positive and negative pressure conveying by Roots blower, bin pump, AV pump (ash tank pump) and other dense phase positive conveying. The mass concentration of dilute phase dust is less than 5kg/m3, and the concentration of concentrated phase is greater than 25kg/m3. Taking Roots blower as an example of gas source, its conveying is dilute phase conveying. Today, the editor will talk about its positive and negative pressure conveying characteristics:

　　1、罗茨风机负压输送的特性

　　1. Characteristics of negative pressure conveying of Roots blower

　　（1）罗茨鼓风机布置在系统的最后部分，系统在负压下运行整个系统要求严密，无漏气现象。

　　(1) The Roots blower is arranged at the end of the system, and the system operates under negative pressure. The entire system requires tightness and no air leakage.

　　（2）要求分离器具有较高的除尘效率，防止风机磨损、粉尘结块和污染排放。

　　(2) The separator is required to have high dust removal efficiency to prevent fan wear, dust agglomeration, and pollution emissions.

　　（3）输送粉尘的空气湿度不宜过高，以保证整个系统不被堵塞。

　　(3) The air humidity for transporting dust should not be too high to ensure that the entire system is not blocked.

　　（4）粉尘应均匀进入系统，保证粉尘与空气混合均匀。

　　(4) Dust should enter the system evenly to ensure even mixing with air.

　　（5）要求负压运行相对稳定，压力波动不宜过大。

　　(5) Require relatively stable negative pressure operation and avoid excessive pressure fluctuations.

　　2、罗茨风机正压输送的特性

　　2. Characteristics of positive pressure conveying of Roots blower

　　（1）罗茨鼓风机位于系统前部，整个系统在正压下工作。如果有漏风，会造成二次扬尘污染，所以系统的漏风要求比负压型更严格。

　　(1) The Roots blower is located at the front of the system, and the entire system operates under positive pressure. If there is air leakage, it will cause secondary dust pollution, so the air leakage requirements of the system are stricter than those of negative pressure type.

　　（2）应防止供料器出口回风引起系统气流短路。

　　(2) Prevent the return air from the feeder outlet from causing a short circuit in the system airflow.

　　（3）采用旋转供料器进行正压气力输送时，应注意叶轮的磨损不宜过大。

　　(3) When using a rotary feeder for positive pressure pneumatic conveying, attention should be paid to avoiding excessive wear on the impeller.

　　（4）正压气动传动的供气必须充分保证其供气量和压力。

　　(4) The air supply for positive pressure pneumatic transmission must ensure sufficient supply volume and pressure.

　　（5）正压气力输送距离不宜过长。

　　(5) The distance of positive pressure pneumatic conveying should not be too long.

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