Detailed introduction of Roots blower ash removal pneumatic conveying system:

Xinqianshun Machinery introduces the pneumatic conveying system of Roots blower ash removal

When using Roots blower to design the ash handling system, first of all, it is necessary to ensure that the expected conveying task can be completed, and at the same time, it is necessary to reasonably determine the type and capacity of equipment used, as well as related problems and design. It not only depends on the cost of equipment, but also comprehensively considers the impact of material properties on quality, transportation volume, transportation distance, transportation route status, and the difficulty and cost of operation management. For example, for some materials, various equipment conditions are suitable for pneumatic conveying, but due to high water content, strong viscosity and other reasons, pneumatic conveying cannot be carried out through Roots blower. Even if the cost of mechanical transportation equipment is high, mechanical transportation will be selected.

Because of this situation, when conveying certain materials, such as limestone powder to the bunker in front of the circulating fluidized bed boiler, the power required for pneumatic conveying by roots blower is relatively large. At first glance, the operation cost is relatively high, but from the perspective of system rationality and production technology, pneumatic conveying is preferred. Under what circumstances and in what way, The following requirements should be followed: reasonable economy: generally speaking, mechanical transportation is favorable for short distance transportation. On the contrary, for long-distance transportation, from the perspective of power demand, the pneumatic conveying system with Roots blower is unfavorable, but in terms of equipment costs, the pneumatic conveying system is often favorable. The equipment cost, required power and operation cost will vary greatly according to the surrounding conditions, so it cannot be generalized. In addition, please note that according to the conditions of various platform supports and auxiliary equipment, the range of change is also large. In a word, when designing the pneumatic ash handling system of Roots blower, the best conveying system and corresponding equipment should be selected according to the specific conditions of the project and through comprehensive technical and economic comparison. If the conveying output and distance of the system are determined, the economy of the system generally depends on the ash gas mixture ratio

From the perspective of equipment energy consumption: the power required by air pushing (suction) equipment is proportional to the product of system pressure and air flow. Increasing the mixing ratio of ash gas can reduce the amount of air used for air supply. Under the condition that the air supply speed remains unchanged, the air supply volume is proportional to the square of the pipe diameter, i.e. QD2, while the system pressure, i.e. the resistance of the air supply pipeline is inversely proportional to the square of the pipe diameter, i.e. P1/D, but is not proportional to the ash air ratio. Therefore, it is very beneficial to increase the ash gas ratio for air supply, reduce the air volume and reduce the energy consumption of pressure equipment.

From the perspective of system construction cost: due to the increase of ash gas ratio, the inner diameter, support and installation cost of equipment and transmission pipeline are reduced accordingly, and the effect of reducing system construction cost is also very obvious. Obviously, the larger the ash gas ratio is, the more conducive to increasing the transportation capacity and improving the economy. However, if the ash air ratio is too large, the same air flow speed will lead to blockage, and the delivery pressure will also become higher. Negative pressure and low positive pressure pneumatic conveying systems may exceed the allowable inlet pressure or exhaust pressure of the pressure machinery. Therefore, the ash gas ratio is limited by the physical properties of the material, transport mode and transport conditions. Especially for the pneumatic conveying system of the positive pressure Roots blower, considering the size and structure of the bin pump itself, the inner diameter and length of the feed pipe, the number of elbows, the air consumption and other conditions, the ash air is more constrained than nature.