【摘要】：本文是在原有的超低熱值燃?xì)舛嗫捉橘|(zhì)燃燒器的基礎(chǔ)上進(jìn)行優(yōu)化改進(jìn)。著重研究不同熱值時(shí),多孔介質(zhì)積木式排列結(jié)構(gòu)對(duì)燃燒器穩(wěn)定燃燒的極限以及極限工況所對(duì)應(yīng)的污染物排放的影響,力求通過(guò)對(duì)比不同的積木式排列結(jié)構(gòu)所對(duì)應(yīng)的燃燒極限來(lái)找到一種在熱值適應(yīng)性和低污染排放等方面綜合性能比較突出的結(jié)構(gòu)。本文的研究成果為超低熱值氣體的高效清潔利用提供了一條新的途徑。本文通過(guò)數(shù)值模擬的方法依次探索了三種積木式內(nèi)芯結(jié)構(gòu),分別為CAPM-A型、CAPM-B型和CAPM-C型。針對(duì)CAPM-A型內(nèi)芯結(jié)構(gòu),我們還進(jìn)行了試驗(yàn)研究并與相應(yīng)的模擬結(jié)果進(jìn)行了對(duì)比驗(yàn)證。在CAPM-A型內(nèi)芯結(jié)構(gòu)中,多孔介質(zhì)的孔徑從上游到下游成逐漸變小的趨勢(shì)而CAPM-B型內(nèi)芯結(jié)構(gòu)與此正好相反。研究結(jié)果表明:CAPM-B型內(nèi)芯結(jié)構(gòu)的熱值適應(yīng)性較好,其能夠燃燒最小熱值為1.2MJ/Nm3的氣體,而CAPM-A型內(nèi)芯結(jié)構(gòu)對(duì)應(yīng)的最小熱值為1.4MJ/Nm3;此外在穩(wěn)定燃燒區(qū)域的范圍和低污染排放方面,CAPM-B型內(nèi)芯結(jié)構(gòu)的性能也都優(yōu)于CAPM-A型內(nèi)芯結(jié)構(gòu)。以上結(jié)論進(jìn)一步說(shuō)明了積木式排列的多孔介質(zhì)內(nèi)芯結(jié)構(gòu)在孔徑上應(yīng)該遵循從上游到下游逐漸變大的趨勢(shì)�？紤]到貼近內(nèi)筒壁面?zhèn)鹊亩嗫捉橘|(zhì)的孔徑會(huì)影響到對(duì)內(nèi)外筒間新鮮燃?xì)獾念A(yù)熱效果,我們?cè)贑APM-B型內(nèi)芯結(jié)構(gòu)的基礎(chǔ)上又探索了CAPM-C型內(nèi)芯結(jié)構(gòu),其與CAPM-B型內(nèi)芯結(jié)構(gòu)的區(qū)別在于貼近壁面處的多孔介質(zhì)要比相應(yīng)的CAPM-B型的多孔介質(zhì)的孔密度小5PPI。研究結(jié)果表明:CAPM-C型內(nèi)芯結(jié)構(gòu)的熱值適應(yīng)性較差,其能夠燃燒最小熱值為1.5MJ/Nm3的氣體;此外在穩(wěn)定燃燒區(qū)域的范圍和低污染排放方面,CAPM-B型內(nèi)芯結(jié)構(gòu)的性能也都優(yōu)于CAPM-C型內(nèi)芯結(jié)構(gòu)。對(duì)于各個(gè)內(nèi)芯結(jié)構(gòu)而言:不論是回火極限還是脫火極限,極限工況的功率隨著熱值的增大而增大;熱值一定時(shí),脫火極限的功率大于相應(yīng)的回火極限;介于脫火極限和回火極限之間的穩(wěn)定燃燒區(qū)域的范圍隨著熱值的提高而變大;熱值一定時(shí),回火極限對(duì)應(yīng)的CO排放量大于脫火極限時(shí)的CO排放量;CO的排放量隨著燃?xì)鉄嶂档臏p小而大大增加。對(duì)比各個(gè)內(nèi)芯結(jié)構(gòu)的結(jié)果表明:在其它條件一致時(shí),CAPM-B型在熱值適應(yīng)性、穩(wěn)定燃燒區(qū)域的范圍和低污染排放上綜合性能優(yōu)于其它排列結(jié)構(gòu)。采用CAPM-B型內(nèi)芯結(jié)構(gòu)時(shí),超低熱值燃?xì)舛嗫捉橘|(zhì)燃燒器穩(wěn)定燃燒對(duì)應(yīng)的最小熱值為1.2MJ/Nm3,相應(yīng)的能夠滿足穩(wěn)定燃燒的的最小燃燒強(qiáng)度為61.15 kW/m2,對(duì)于燃燒強(qiáng)度大于61.15 kW/m2的工況只要選用合適熱值的氣體就都能在此多孔介質(zhì)燃燒器中實(shí)現(xiàn)穩(wěn)定燃燒。
[Abstract]:This paper is based on the original ultra-low calorific value gas burner in porous media. The influence of the building block arrangement structure of porous media on the combustion limit of the burner and the pollutant emission corresponding to the limit condition are studied. By comparing the combustion limits of different building block arrangement structures, we try to find a structure with outstanding comprehensive performance in the aspects of heat adaptability and low pollution emission. The results of this paper provide a new way for the efficient and clean utilization of ultralow calorific gases. In this paper, three kinds of building block core structures, CAPM-A type, CAPM-B type and CAPM-C type, are explored by means of numerical simulation. For the inner core structure of CAPM-A, we have also carried out the experimental research and compared with the corresponding simulation results. In CAPM-A core structure, the pore size of porous media decreases gradually from upstream to downstream, whereas CAPM-B core structure is the opposite. The results show that the heat value of CAPM-B core structure is good, and it can burn gas whose minimum calorific value is 1.2MJ/Nm3. The minimum calorific value of CAPM-A core structure is 1.4MJ / Nm3.In addition, the performance of CAPM-B core structure is better than that of CAPM-A core structure in terms of stable combustion region and low pollution emission. The above conclusion further indicates that the core structure of the porous media with block arrangement should follow the trend of increasing from upstream to downstream in pore size. Considering that the pore size of porous media close to the wall of the inner cylinder will affect the preheating effect of fresh gas between the inner and outer cylinders, we have explored the CAPM-C core structure on the basis of the CAPM-B inner core structure. The difference between it and the core structure of CAPM-B is that the pore density of the porous media near the wall is 5 PPI less than that of the corresponding CAPM-B type. The results show that the heat adaptability of CAPM-C core structure is poor, and the minimum calorific value of 1.5MJ/Nm3 gas can be burned. In addition, the performance of CAPM-B core structure is better than that of CAPM-C core structure in terms of stable combustion region and low pollution emission. For each core structure, whether it is tempering limit or de-tempering limit, the power of limit condition increases with the increase of calorific value, the power of de-tempering limit is larger than corresponding tempering limit when calorific value is fixed. The range of stable combustion region between tempering limit and tempering limit increases with the increase of calorific value. The CO emissions corresponding to the tempering limit are larger than the CO emissions at the de-tempering limit, and the CO emissions increase with the decrease of the gas calorific value. The results of comparison of each inner core structure show that when other conditions are the same, the comprehensive performance of CAPM-B type is superior to that of other arrangement structures in the adaptability of calorific value, the range of stable combustion region and the low pollution emission. When adopting the inner core structure of CAPM-B, The minimum calorific value corresponding to the steady combustion of ultralow calorific value gas porous medium burner is 1.2 MJ / Nm ~ (3), and the corresponding minimum combustion intensity is 61.15 kW/m2, when the combustion intensity is greater than 61.15 kW/m2 if the appropriate calorific value is selected. The gas can be burned stably in this porous medium burner.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ052.73

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