管道是气力输送系统的重要组成部分，在整个系统中占的比例也比较重，管道也是整个系统中最容易出现问题的地方，那么在管道的选择方面哪种规格的管道在气力输送系统中的使用最为经济？本文来分析这个问题。

Pipelines are an important component of pneumatic conveying systems and account for a relatively large proportion of the entire system. Pipelines are also the most prone to problems in the entire system. Therefore, in terms of pipeline selection, which specification of pipeline is the most economical to use in pneumatic conveying systems? This article will analyze this issue.

在气力输送系统中，对于给定的物料输送能力和输送距离，可供选择的管道管径规格、输送方式和供应压力有很广的范围，选择哪种规格的管径和供应压力最经济，需要综合考虑工厂的建设费用和操作费用，操作费用主要是由能耗造成。

In pneumatic conveying systems, there is a wide range of pipe diameter specifications, conveying methods, and supply pressures available for a given material conveying capacity and distance. Choosing the most economical pipe diameter and supply pressure requires comprehensive consideration of the factory's construction and operating costs, which are mainly caused by energy consumption.

通过比较可知，相对于低压稀相输送，高压密相输送速度低、能耗低，因而操作费用低;密相输送所用管径小，除尘设备也较小，但发送装置(发送罐)相对于低压所用的旋转阀较昂贵，所以两种方式的建设费用需要综合考虑。

By comparison, it can be seen that compared to low-pressure dilute phase transportation, high-pressure dense phase transportation has lower speed and energy consumption, resulting in lower operating costs; The diameter of the pipe used for dense phase transportation is small, and the dust removal equipment is also small. However, the sending device (sending tank) is relatively expensive compared to the rotary valve used for low pressure, so the construction costs of both methods need to be considered comprehensively.

对于输送物料来说，气力输送形式有多种选择，工程上常见的气力输送形式为稀相输送和密相输送，熟知稀相和密相输送的适用场合和能耗大小是合理选择输送形式、降低输送成本的前提。

For conveying materials, there are multiple options for pneumatic conveying. The common pneumatic conveying forms in engineering are dilute phase conveying and dense phase conveying. Familiarity with the applicable scenarios and energy consumption of dilute phase and dense phase conveying is a prerequisite for selecting a reasonable conveying form and reducing conveying costs.

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