Energy consumption and stability are two key factors affecting the equipment transportation of powder pneumatic conveying system. Energy consumption is the power consumption of the powder moving in the pipeline with the transported gas, that is, the pressure drop; That is, the stability of the transportation process. Unstable transportation may lead to blockage and make the transportation unable to proceed normally. Therefore, to study the long-distance pneumatic conveying of powder pneumatic conveying system equipment is to study how to reduce energy consumption and maintain the stability of conveying.

1.能耗

1. Energy consumption

能耗是氣力輸送系統(tǒng)設(shè)備過程中的功率消耗(壓降)。降低能耗可以降低單位輸送長度的壓降，增加輸送距離。氣力輸送的壓降與許多因素有關(guān)。不同種類、粒度和水分含量的粉體有不同的氣力輸送規(guī)律。對于同一種粉體，粒度及其分布、水分含量是影響粉體流動性的主要因素。粒度越小，分布越廣，水分含量越高，其流動性越差，氣力輸送就越困難。

Energy consumption is the power consumption (pressure drop) in the process of pneumatic conveying system equipment. Reducing energy consumption can reduce the pressure drop per unit conveying length and increase the conveying distance. The pressure drop of pneumatic conveying is related to many factors. Different types, particle sizes and moisture contents of powders have different pneumatic conveying laws. For the same powder, particle size and its distribution and moisture content are the main factors affecting the fluidity of the powder. The smaller the particle size, the wider the distribution, the higher the moisture content, the worse the fluidity, and the more difficult the pneumatic conveying.

氣力輸送系統(tǒng)設(shè)備

Pneumatic conveying system equipment

2.穩(wěn)定性

2. Stability

氣力輸送系統(tǒng)設(shè)備輸送的表觀氣速沿管道不斷變大，氣固兩相流的流型也隨之變化。當(dāng)輸送氣速下降到密相穩(wěn)態(tài)輸送的邊界時，會形成不穩(wěn)定的沙丘流，表現(xiàn)為壓力波動變大，輸送氣速不斷降低，物料會沿管道堆積，直堵塞管道。因此，研究粉體氣力輸送的穩(wěn)定性，保持輸送系統(tǒng)處于穩(wěn)定狀態(tài)，對實現(xiàn)長距離氣力輸送具有重要意義。

The apparent gas velocity transported by pneumatic conveying system equipment increases along the pipeline, and the flow pattern of gas-solid two-phase flow also changes. When the conveying gas velocity drops to the boundary of dense phase steady-state transportation, an unstable dune flow will be formed, which shows that the pressure fluctuation becomes larger, the conveying gas velocity decreases continuously, and the materials will accumulate along the pipeline until the pipeline is blocked. Therefore, studying the stability of powder pneumatic conveying and keeping the conveying system in a stable state is of great significance to realize long-distance pneumatic conveying.

影響粉體氣力輸送系統(tǒng)設(shè)備輸送的兩個關(guān)鍵因素是能耗和穩(wěn)定性。能耗是粉體隨輸送氣體在管道中運動的功耗，即壓降;即運輸過程的穩(wěn)定性，運輸不穩(wěn)定可能導(dǎo)致堵塞，使運輸無法正常進行。因此，研究粉體的長距離氣力輸送，就是研究如何降低能耗，保持輸送的穩(wěn)定性。

Energy consumption and stability are two key factors affecting the equipment transportation of powder pneumatic conveying system. Energy consumption is the power consumption of the powder moving in the pipeline with the transported gas, that is, the pressure drop; That is, the stability of the transportation process. Unstable transportation may lead to blockage and make the transportation unable to proceed normally. Therefore, the study of long-distance pneumatic conveying of powder is to study how to reduce energy consumption and maintain the stability of conveying.

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