本文選題：對(duì)旋局部通風(fēng)機(jī)　切入點(diǎn)：葉片安裝角　出處：《太原理工大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：隨著開(kāi)采深度的增加,煤礦會(huì)形成復(fù)雜的多區(qū)域通風(fēng)系統(tǒng),呈現(xiàn)出通風(fēng)阻力過(guò)大、采掘地點(diǎn)風(fēng)量不足、風(fēng)機(jī)效率降低等一系列問(wèn)題。因此,常常采用高功率的局部通風(fēng)機(jī)配合大直徑高強(qiáng)風(fēng)筒,來(lái)實(shí)現(xiàn)深遠(yuǎn)巷道的掘進(jìn)通風(fēng),最遠(yuǎn)可達(dá)2000m以上。而在掘進(jìn)巷道的過(guò)程中,對(duì)旋風(fēng)機(jī)并不能一直在高效區(qū)運(yùn)行。長(zhǎng)期處于非設(shè)計(jì)工況下,不僅效率低,造成能源浪費(fèi),還會(huì)影響工作面的正常作業(yè)。因此,研究基于安裝角變化的對(duì)旋局部通風(fēng)機(jī)調(diào)節(jié)性能及其內(nèi)部流動(dòng)情況,對(duì)其合理運(yùn)行及改善工作面作業(yè)環(huán)境具有重要意義。利用計(jì)算流體力學(xué)(Computational Fluid Dynamics)軟件Fluent對(duì)FBD No8.0 2×55k W型風(fēng)機(jī)進(jìn)行了全流場(chǎng)定常數(shù)值模擬,探討了樣機(jī)第一、二級(jí)葉輪葉片安裝角變化對(duì)其自身性能的影響機(jī)理,得出了不同安裝角所對(duì)應(yīng)的風(fēng)機(jī)性能曲線(xiàn)以及內(nèi)流特征,并結(jié)合試驗(yàn),驗(yàn)證了仿真結(jié)果;比較不同安裝角調(diào)節(jié)方式對(duì)性能影響的區(qū)別,為根據(jù)工況合理選擇安裝角,實(shí)現(xiàn)風(fēng)機(jī)的高效節(jié)能運(yùn)行,避免電機(jī)過(guò)載提供了依據(jù)。研究表明,同時(shí)增加兩級(jí)安裝角,風(fēng)機(jī)的全壓曲線(xiàn)向右上移動(dòng),在大流量、低風(fēng)壓的工況下運(yùn)行效率高,兩級(jí)軸功率增加,匹配度高,但第二級(jí)負(fù)載增長(zhǎng)幅度大于第一級(jí);通過(guò)改變安裝角能滿(mǎn)足不同的工況需求,在改變?nèi)我庖患?jí)安裝角相同角度的情況下,風(fēng)機(jī)的性能相似,而且運(yùn)行效率受第二級(jí)葉片的影響較大;減小后級(jí)葉片安裝角能降低負(fù)載,且前級(jí)基本不受影響;如果改變第一級(jí)安裝角,除第一級(jí)軸功率發(fā)生變化外,第二級(jí)軸功率也會(huì)隨之增大或減小。另外,以500m和2000m作為短距離通風(fēng)和長(zhǎng)距離通風(fēng)的代表,分別結(jié)合管網(wǎng)和不同安裝角時(shí)風(fēng)機(jī)的性能曲線(xiàn)進(jìn)行分析。短距離通風(fēng)時(shí),工作面所需要的風(fēng)量和風(fēng)壓較小,調(diào)小葉片安裝角能夠有效的減小風(fēng)機(jī)的輸出功率,節(jié)省能耗;長(zhǎng)距離通風(fēng)時(shí),需要的風(fēng)量和風(fēng)壓較大,適當(dāng)增加葉片安裝角可以滿(mǎn)足工作面高風(fēng)壓和大流量的需求。但是,要注意增大安裝角是否會(huì)使電機(jī)超載。最后,對(duì)轉(zhuǎn)速和安裝角調(diào)節(jié)進(jìn)行了對(duì)比分析。根據(jù)工況對(duì)風(fēng)機(jī)進(jìn)行調(diào)整,能夠?qū)崿F(xiàn)其高效運(yùn)行,最終達(dá)到節(jié)能減排的目的。本文還提出了外置單電機(jī)可調(diào)對(duì)旋風(fēng)機(jī),一方面利用機(jī)械結(jié)構(gòu)調(diào)節(jié)葉片安裝角,使其在實(shí)現(xiàn)葉片安裝角調(diào)節(jié)的基礎(chǔ)上,實(shí)現(xiàn)了結(jié)構(gòu)緊湊,調(diào)節(jié)方便的目的;另一方面,將雙電機(jī)帶動(dòng)雙葉輪的傳統(tǒng)對(duì)旋風(fēng)機(jī)結(jié)構(gòu)進(jìn)行優(yōu)化,提出了單電機(jī)外置對(duì)旋方案,利用傳動(dòng)箱將單一動(dòng)力分別傳輸至兩級(jí)葉輪,有效的解決了現(xiàn)有風(fēng)機(jī)電機(jī)維護(hù)難、功率不匹配等問(wèn)題。結(jié)合ADAMS對(duì)葉片調(diào)節(jié)模塊進(jìn)行了多體動(dòng)力學(xué)分析,得出了前后級(jí)的調(diào)節(jié)范圍分別是-18°到10°和-5.5°到5.5°,以及兩級(jí)傳動(dòng)比非恒定的結(jié)論,為研究和改進(jìn)機(jī)構(gòu)奠定了基礎(chǔ)。
[Abstract]:With the increase of mining depth, the coal mine will form a complex multi-area ventilation system, which presents a series of problems, such as excessive ventilation resistance, insufficient air volume in mining sites, and reduced fan efficiency, etc. High power local fan combined with large diameter high strength tuyere is often used to realize tunneling ventilation of far-reaching roadway, as far as 2000m. However, in the process of tunneling, The cyclone can not always run in the high efficiency zone. It is not only low efficiency, resulting in energy waste, but also affects the normal operation of the working face for a long time in the off-design condition. The regulating performance and internal flow of the counterrotating local fan based on the change of installation angle are studied. It is of great significance to operate reasonably and improve the working environment of the working face. The numerical simulation of the whole flow field of the FBD No8.0 2 脳 55kW fan is carried out by using the Computational fluid Dynamics (Fluent) software Fluent, and the first one of the prototype is discussed. The influence mechanism of the installation angle of the secondary impeller blade on its own performance is obtained. The fan performance curve and the characteristics of the inner flow corresponding to the different installation angles are obtained, and the simulation results are verified by the test. By comparing the influence of different adjustment ways of installation angle on performance, this paper provides a basis for reasonably selecting installation angle according to the working conditions, realizing the efficient and energy saving operation of the fan and avoiding the overload of the motor. The research shows that the two-stage installation angle is increased at the same time. The full pressure curve of the fan moves to the upper right, under the condition of large flow rate and low wind pressure, the operation efficiency is high, the power of the two stage axis is increased, and the matching degree is high, but the increase range of the second stage load is larger than that of the first stage. By changing the installation angle, the performance of the fan is similar, and the operation efficiency is greatly affected by the second stage blade. Reducing the installation angle of the rear stage blade can reduce the load, and the front stage is basically unaffected. If the installation angle of the first stage is changed, the second stage shaft power will increase or decrease in addition to the change of the first stage axial power. Taking 500m and 2000m as representatives of short distance ventilation and long distance ventilation, the performance curves of the fan are analyzed in combination with pipe network and different installation angles, respectively. Adjusting the installation angle of the blade can effectively reduce the output power of the fan and save energy consumption. When the ventilation is long distance, the air volume and the wind pressure need to be larger, so increasing the angle of the blade installation can meet the demand of high wind pressure and large flow in the working face. It is necessary to pay attention to whether the motor overload will be caused by increasing the installation angle. Finally, the adjustment of speed and installation angle is compared and analyzed. The fan can be operated efficiently by adjusting the fan according to the working conditions. Finally, the purpose of energy saving and emission reduction is achieved. On the one hand, the mechanical structure is used to adjust the installation angle of the blade, so that the structure of the turbine can be compact based on the adjustment of the installation angle of the blade. On the other hand, the structure of the cyclone is optimized by the traditional method of driving double impellers with double motors, and the scheme of external counterrotation of single motor is put forward, and the single power is transferred to two stage impellers by transmission box. The problems such as difficult maintenance of fan motor and mismatch of power are effectively solved. The multi-body dynamics analysis of blade regulation module is carried out with ADAMS. It is concluded that the adjustment ranges of the front and rear stages are -18 擄to 10 擄and -5.5 擄to 5.5 擄, respectively, and that the ratio of the two stages of transmission is unsteady, which lays a foundation for the study and improvement of the mechanism.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TD441

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 陳曉坤;蔡燦凡;肖e，

本文編號(hào)：1621056