Introduce the pneumatic conveying system of Roots blower for ash removal

利用羅茨風機設計除灰系統(tǒng)，要確保能完成預期的輸送任務，同時要合理確定所采用的設備類型和容量以及相關問題和設計。不僅要看設備費用的多少，更重要的是綜合考慮材料性質(zhì)對質(zhì)量的影響、運輸量、運輸距離、運輸路線狀況以及運行管理的難易程度和費用等。例如，對于某些材料，各種設備條件都適合氣力輸送，但由于材料含水量高、粘性強等原因，無法通過羅茨風機進力輸送，即使機械運輸設備費用較高，也會選擇機械運輸方式。

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 the equipment used, as well as the related problems and design. It depends not only on the equipment cost, but also on the influence of material properties on quality, transportation volume, transportation distance, transportation route, 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.

羅茨鼓風機

Roots blower

由于這種情況，在輸送某種物料時，例如向循環(huán)流化床鍋爐爐前料倉輸送石灰石粉時，采用羅茨風機氣力輸送所需的電力較大，乍一看運行成本較高，但從系統(tǒng)合理性和生產(chǎn)技術上看，還是以氣力輸送為宜.在什么情況下采用哪種方式的技術，應該遵循以下幾個要求：經(jīng)濟性比較合理：一般來說，短距離運輸時，機械運輸有利。相反，對于長距離運輸，從所需電力的角度來看，采用羅茨風機的氣力輸送系統(tǒng)是不利的，但在設備費用方面，采用氣力輸送系統(tǒng)往往是有利的。設備費用、所需電力和運行成本會根據(jù)周圍的條件有很大的變化，因此無法一概而論。另外，請注意，根據(jù)各種平臺支架和附屬設備的情況，變化幅度也很大?？傊?，在設計羅茨風機氣力除灰系統(tǒng)時，應根據(jù)工程具體條件，通過綜合技術經(jīng)濟比較選擇更好的輸送系統(tǒng)和相應的設備。如果系統(tǒng)的輸送出力和輸送距離確定，系統(tǒng)的經(jīng)濟性一般取決于輸送的灰氣混合比

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 large. At first glance, the operation cost is high, but from the perspective of system rationality and production technology, pneumatic conveying is preferred Under what circumstances and in which 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 cost, 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 situation of various platform supports and auxiliary equipment, the range of change is also large. In a word, when designing the pneumatic ash removal system of Roots blower, better 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

從設備能耗來看：推(吸)氣設備所需功率與系統(tǒng)壓力和空氣流量的乘積成正比。提高灰氣體的混合比可以減少送氣用的空氣量。在送風速度保持不變的條件下，送風空氣量與管徑的平方成正比，即QD2，而系統(tǒng)壓力，即送風管路阻力與管內(nèi)徑的平方成反比，即P1/D，但與灰氣比不成正比增加。因此，提高送氣用的灰氣體比，減少空氣量，降低壓力設備的能量消耗是十分有利的。

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 inner diameter, i.e. P1/D, but 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.

從系統(tǒng)建設費用來看：由于灰氣比的提高，設備和輸送管路的內(nèi)徑、支架和安裝費用相應減小，降低系統(tǒng)建設費用的效果也十分明顯。顯然，灰氣比越大，越有利于加大輸送能力，經(jīng)濟性也隨之提高。但是，如果灰氣比過大，相同的氣流速度會導致堵塞，輸送壓力也會變高，負壓式和低正壓式氣力輸送系統(tǒng)可能會超過壓力機械允許的進氣壓力或排氣壓力。因此，灰氣比數(shù)值受材料物理性質(zhì)、輸運方式和輸運條件等因素的限制。特別是正壓羅茨風機的氣力輸送系統(tǒng)，考慮倉泵本身的尺寸和結(jié)構、進料管的內(nèi)徑和長度、彎頭數(shù)量和用氣量等條件，灰氣比自然更受約束。

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 transmission capacity and improving the economy. However, if the ash gas 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 value of ash gas ratio is limited by physical properties of materials, transportation methods and 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 and air consumption, the ash gas is more constrained than nature.

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