Introduce the pneumatic conveying system of Roots blower for ash removal

利用羅茨風(fēng)機(jī)設(shè)計(jì)除灰系統(tǒng)，要確保能完成預(yù)期的輸送任務(wù)，同時(shí)要合理確定所采用的設(shè)備類型和容量以及相關(guān)問題和設(shè)計(jì)。不僅要看設(shè)備費(fèi)用的多少，更重要的是綜合考慮材料性質(zhì)對(duì)質(zhì)量的影響、運(yùn)輸量、運(yùn)輸距離、運(yùn)輸路線狀況以及運(yùn)行管理的難易程度和費(fèi)用等。例如，對(duì)于某些材料，各種設(shè)備條件都適合氣力輸送，但由于材料含水量高、粘性強(qiáng)等原因，無法通過羅茨風(fēng)機(jī)進(jìn)力輸送，即使機(jī)械運(yùn)輸設(shè)備費(fèi)用較高，也會(huì)選擇機(jī)械運(yùn)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(fēng)機(jī)

Roots blower

由于這種情況，在輸送某種物料時(shí)，例如向循環(huán)流化床鍋爐爐前料倉(cāng)輸送石灰石粉時(shí)，采用羅茨風(fēng)機(jī)氣力輸送所需的電力較大，乍一看運(yùn)行成本較高，但從系統(tǒng)合理性和生產(chǎn)技術(shù)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(shù)，應(yīng)該遵循以下幾個(gè)要求：經(jīng)濟(jì)性比較合理：一般來說，短距離運(yùn)輸時(shí)，機(jī)械運(yùn)輸有利。相反，對(duì)于長(zhǎng)距離運(yùn)輸，從所需電力的角度來看，采用羅茨風(fēng)機(jī)的氣力輸送系統(tǒng)是不利的，但在設(shè)備費(fèi)用方面，采用氣力輸送系統(tǒng)往往是有利的。設(shè)備費(fèi)用、所需電力和運(yùn)行成本會(huì)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(qǐng)注意，根據(jù)各種平臺(tái)支架和附屬設(shè)備的情況，變化幅度也很大?？傊?，在設(shè)計(jì)羅茨風(fēng)機(jī)氣力除灰系統(tǒng)時(shí)，應(yīng)根據(jù)工程具體條件，通過綜合技術(shù)經(jīng)濟(jì)比較選擇更好的輸送系統(tǒng)和相應(yīng)的設(shè)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(jì)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(shè)備能耗來看：推(吸)氣設(shè)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(fēng)速度保持不變的條件下，送風(fēng)空氣量與管徑的平方成正比，即QD2，而系統(tǒng)壓力，即送風(fēng)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(shè)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(shè)費(fèi)用來看：由于灰氣比的提高，設(shè)備和輸送管路的內(nèi)徑、支架和安裝費(fèi)用相應(yīng)減小，降低系統(tǒng)建設(shè)費(fèi)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(jì)性也隨之提高。但是，如果灰氣比過大，相同的氣流速度會(huì)導(dǎo)致堵塞，輸送壓力也會(huì)變高，負(fù)壓式和低正壓式氣力輸送系統(tǒng)可能會(huì)超過壓力機(jī)械允許的進(jìn)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(yùn)方式和輸運(yùn)條件等因素的限制。特別是正壓羅茨風(fēng)機(jī)的氣力輸送系統(tǒng)，考慮倉(cāng)泵本身的尺寸和結(jié)構(gòu)、進(jìn)料管的內(nèi)徑和長(zhǎng)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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The above is a detailed introduction to the design of Guangxi pneumatic conveying scheme. I hope it will be helpful to you. If you have any questions, please contact us. We will provide you with professional services http://www.25dns.cn/