本文選題：濕式電除塵器 + 預(yù)混燃燒��； 參考：《河北科技大學(xué)》2013年碩士論文

【摘要】：本課題來(lái)源于河北省科技廳重大技術(shù)創(chuàng)新項(xiàng)目。針對(duì)50MW以上大型燃?xì)狻羝?lián)合循環(huán)發(fā)電機(jī)組的濕式電除塵器內(nèi)發(fā)生的高爐煤氣爆炸問(wèn)題，對(duì)其泄爆過(guò)程進(jìn)行了理論分析和數(shù)值模擬，通過(guò)分析整個(gè)過(guò)程流場(chǎng)的溫度、壓強(qiáng)等發(fā)展特征，得到了煤氣爆炸和泄爆過(guò)程的流場(chǎng)狀態(tài)。根據(jù)模擬結(jié)果對(duì)除塵器泄爆閥的設(shè)置進(jìn)行了優(yōu)化，驗(yàn)證了濕式電除塵器在高壓強(qiáng)、高流速、高爆炸性極端條件下運(yùn)行的可靠性，為除塵器泄爆裝置的設(shè)計(jì)和安裝提供了依據(jù)。 本文依據(jù)流體動(dòng)力學(xué)軟件FLUENT首先模擬了高爐煤氣在濕式電除塵器內(nèi)正常情況下的流動(dòng)狀態(tài)，并與現(xiàn)場(chǎng)實(shí)驗(yàn)進(jìn)行對(duì)比，驗(yàn)證了軟件模擬的可行性；然后根據(jù)預(yù)混氣體燃燒中的渦耗散模型，對(duì)高爐煤氣的爆炸進(jìn)行了模擬，，探索了高爐煤氣爆炸的機(jī)理，分析了在可燃物CO的濃度、初始?jí)簭?qiáng)、當(dāng)量比和點(diǎn)火位置等影響因素下爆炸的火焰發(fā)展特征和流場(chǎng)發(fā)展特征，確定了各個(gè)因素對(duì)爆炸發(fā)展的影響；最后根據(jù)開(kāi)口泄爆模型，對(duì)泄爆閥在不同直徑、數(shù)量和位置下的泄爆方案進(jìn)行了模擬，得到了泄爆過(guò)程中壓強(qiáng)下降規(guī)律，并對(duì)泄爆閥在除塵器上的設(shè)置提出了優(yōu)化方案。 在爆炸強(qiáng)度模擬中，分析了爆炸燃燒溫度和壓強(qiáng)的生成和發(fā)展規(guī)律，得出當(dāng)量比影響最大，其后依次為CO濃度、初始?jí)簭?qiáng)和點(diǎn)火位置。最高溫度發(fā)展速率達(dá)到1.9×10~6K/s，最高壓強(qiáng)發(fā)展速率最高達(dá)到9×10~5KPa/s。在泄爆模擬過(guò)程中，研究了濕式電除塵器上泄爆閥直徑、個(gè)數(shù)和位置對(duì)泄爆過(guò)程的影響。結(jié)果表明，增加泄爆閥直徑和數(shù)量都會(huì)提高泄爆的效率，縮短泄爆時(shí)間�？紤]泄爆閥恢復(fù)原位的重復(fù)性，最終優(yōu)化確定采用2個(gè)直徑D=600mm的泄爆閥，此方案模擬得到的泄爆過(guò)程壓強(qiáng)發(fā)展?jié)M足濕式電除塵器極限壓強(qiáng)的要求。
[Abstract]:This topic comes from Hebei province science and technology department major technology innovation project. In view of the blast furnace gas explosion in the wet electric precipitator of large gas-steam combined cycle generator set above 50MW, the explosion process of blast furnace gas is analyzed theoretically and numerically. The temperature of the flow field is analyzed by analyzing the temperature of the whole process. The flow field state of gas explosion and explosion discharge process is obtained by pressure and other development characteristics. According to the simulation results, the setting of the explosion relief valve of the dust collector is optimized, and the reliability of the wet electrostatic precipitator running under the conditions of high pressure, high velocity and high explosive extreme is verified, which provides the basis for the design and installation of the exploding device of the dust collector. According to the fluid dynamics software FLUENT, the flow state of blast furnace gas in the wet electrostatic precipitator is first simulated, and compared with the field experiment, the feasibility of the software simulation is verified. Then according to the vortex dissipation model of premixed gas combustion, the blast furnace gas explosion is simulated, the mechanism of blast furnace gas explosion is explored, and the concentration and initial pressure of the combustible CO are analyzed. Under the influence factors such as equivalent ratio and ignition position, the characteristics of flame development and flow field development of explosion are determined, and the influence of each factor on explosion development is determined. The number and position of the venting scheme are simulated, and the law of pressure drop during the process of discharging is obtained, and the optimized scheme of setting the explosion-relief valve on the dust collector is put forward. In the simulation of explosion intensity, the formation and development of explosion combustion temperature and pressure are analyzed. It is concluded that the equivalent ratio has the greatest influence, followed by CO concentration, initial pressure and igniting position. The maximum temperature growth rate is 1.9 脳 10 ~ (-6) K / s, and the maximum pressure development rate is 9 脳 10 ~ (5) KPA / s. The influence of the diameter, number and position of the vent valve on the discharge process of wet electrostatic precipitator was studied. The results show that increasing the diameter and quantity of the vent valve can improve the efficiency and shorten the discharge time. Considering the reproducibility of the relief valve in its original position, two diameter D=600mm valves were optimized and the pressure of the process was developed to meet the requirement of the limit pressure of the wet electrostatic precipitator (ESP).
【學(xué)位授予單位】：河北科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TF088

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