In what circumstances and what kind of the method does the technical economical comparison adopt is reasonable? Generally speaking, in a relatively short distance transportation, the mechanical transmission is good; On the other hand, for a long distance transportation, although from the point of the required power, using pneumatic conveying system is bad, but in terms of the cost of equipment, using the pneumatic conveying system is more beneficial. Equipment cost and the required power and operation cost on different ambient condition, there is a big change, so it can't be compared in general. You should also notice that with all sorts of platform support and ancillary equipment, there is also a very big change. In a word, when designing the pneumatic dedusting system, you should select the most appropriate transportation system and the corresponding equipment comprehensively through technical and economic comparison according to the project's specific conditions. If the system's output and transportation distance are set, then the system of economy generally depends on the ash and gas mixing ratio.From the energy consumption equipment, the needed power of the pressure (smoke) gas equipment is at direct ratio with the system pressure multiply by the airflow rate If you improve the ash-gas mixing ratio, the amount of air can be reduced. The transmission speed remains at some certain conditions, with the amount of air transmission is proportional to the diameter of square, that is the Q ¡Ø D2 and system pressure pipeline resistance is inversely proportional to the pipe inner rehabilitated, namely 1 / P ¡Ø D is not incresing square of th the direct ratio between the gas and ash. Therefore, it is beneficial to improv the delivery of ash-gas ratio, reduce the amount of air and the pressure of energy consumption of the (smoke) gas equipment: Secondly, from the system infrastructure cost, because of the increase in the ash-gas ratio of equipment and pipeline diameter, the stand and installation cost can be reduced accordingly.It is obvious to see the effect of reducing the system¡¯s infrastructure cost.
The larger of the ash-gas ratio ¦Ì , the greater for increasing the transmission capacity and apparently this will improve the economy. However, if the ash/-gas ratio is too big, it may arouse congestion under the same air velocity and the delivery pressure will be increased. For the low negative-pressure and positive-pressure pneumatic conveying system, ii is likely to exceed the suction pressure or exhaust pressure that the pneumatic mechanery allowed. Therefore, the ash-gas ratio value is influenced by the physical properties of the material, transmission mode and delivery conditions. Especially for the positive pressure pneumatic conveying system, considering the size and structure of the pump itself, the inner diameter of the transporting pipe and the length, the number of elbow and the air quantity, ect., the ash-gas ratio is more naturally constrained.