Application of Roots blower in pneumatic conveying system
「 Roots blower "In app" Pneumatic conveying system To ensure that it can complete the expected transport task and reasonably determine the equipment used The type and capacity of the equipment, as well as the problems and design, are related to it, not just the cost of the equipment. How many, and more importantly, it is necessary to synthesize Consider the impact of material properties on quality, volume, distance, route, ease of operation and management and cost. For example, yes For some materials, the conditions of various equipment are suitable for pneumatic conveying, but because the material contains a lot of moisture, adhesion and other reasons, the This cannot be used Roots blower Pneumatic conveying. Even if the mechanical conveying equipment is very expensive, the mechanical conveying method must be selected. In some cases, such as when conveying limestone powder to a storage tank in front of a circulating fluidized bed boiler, the Roots blower Power required for pneumatic conveying It's big. At first glance, the operation cost is high, but from the perspective of system rationality or production technology, it is better to use pneumatic. under these circumstances Which method and technology should be adopted should follow the following requirements:
1、 The economy is reasonable
Generally speaking, mechanical conveying is beneficial for short distance transportation; on the contrary, for long distance transportation, although from the perspective of power required, the Roots blower Of Pneumatic conveying system But in terms of equipment cost, it is often adopted Pneumatic conveying system It's good. Equipment cost
Therefore, there is a big difference between the operating costs and the surrounding conditions. At the same time, it should be noted that due to the different conditions of various platform supports and auxiliary equipment, there are also great changes.
In short, in design Roots blower The pneumatic ash handling system should be based on the specific situation of the project. After comprehensive comparison of technology and economy, the most suitable conveying system and corresponding equipment are selected. If the transmission power and distance of the system have been determined, the economy of the system usually depends on the mixing ratio of flue gas.
2、 Equipment energy consumption
The power required by pressure (extraction) equipment is proportional to the product of system pressure and air flow. If the mixing ratio of ash and gas is increased, the amount of air to be transported can be reduced. Under the condition of constant conveying speed, the air quantity to be transported is directly proportional to the square of pipe diameter, i.e. Q ∝ D2, and the system pressure is. The resistance is inversely proportional to the decrease of pipe diameter. The ratio of PDD to inner diameter is not proportional to PDD. Therefore, it is very beneficial to increase gas ratio and reduce air volume to reduce energy consumption of pressure (exhaust) equipment.
Conclusion: from the perspective of system infrastructure cost, due to the increase of gas / gas ratio, the inner diameter of equipment and pipeline, support and installation cost can be reduced correspondingly, and the effect of reducing system infrastructure cost is also obvious. Obviously. The larger the gas to air ratio μ is, the more favorable it is to increase the conveying capacity and obviously improve the economy. However, if the air velocity is too high, the gas blockage may occur at the same pressure. For negative pressure and low positive pressure Pneumatic conveying system It may exceed the suction pressure or discharge pressure allowed by the press. Therefore, the value of the ash / air ratio is limited by factors such as the physical properties of the material, the transportation method and the transportation conditions. Especially for positive pressure Pneumatic conveying system of Roots blower Considering the size and structure of the silo pump itself, the inner diameter and length of the delivery pipe, the number of elbows and the amount of air used, ash gas is more limited than natural
Application of Roots blower in "pneumatic conveying system" http://theoxfordjazz.com/xw/113.html
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