本文關(guān)鍵詞：多針—板脈沖放電反應(yīng)器結(jié)構(gòu)優(yōu)化及降解甲醛的研究　出處：《江西理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 多針-板 電暈放電 反應(yīng)器 光催化 甲醛

【摘要】：近年來,以甲醛為代表的揮發(fā)性有機(jī)物(Volatile Organic Compounds,VOCs)嚴(yán)重危害著人們的身心健康和居住環(huán)境。逐步發(fā)展起來的脈沖放電協(xié)同催化技術(shù)在降解甲醛的應(yīng)用中顯示出了效率高、副產(chǎn)物少、運(yùn)行穩(wěn)定等優(yōu)勢,且相關(guān)研究日趨深入,但如何對脈沖放電反應(yīng)器進(jìn)行結(jié)構(gòu)優(yōu)化,從而提高放電能量的利用率,需要進(jìn)一步深入研究。本文對多針-板高壓脈沖放電反應(yīng)器結(jié)構(gòu)優(yōu)化及降解甲醛作了深入的實(shí)驗(yàn)研究。實(shí)驗(yàn)采用自制的多針-板高壓脈沖電暈放電反應(yīng)器,通過研究反應(yīng)器在不同電極結(jié)構(gòu)下的放電特性優(yōu)化了其電極配置(針板間距、針針間距),在優(yōu)化的電極配置下,進(jìn)一步考察了電極配置、電參數(shù)(脈沖峰值電壓、重復(fù)頻率)、氣體參數(shù)(氣體流量、進(jìn)氣方向)對脈沖放電能量注入及甲醛降解變化規(guī)律的影響。并采用優(yōu)化后的反應(yīng)器,深入研究了脈沖電暈放電協(xié)同過渡金屬(Mn、Fe、Cu)、貴金屬(Ag)催化劑對甲醛降解率、O3產(chǎn)量、CO2選擇性和能量效率的影響,探討了甲醛的降解機(jī)理。研究結(jié)果表明:(1)脈沖放電經(jīng)歷了不穩(wěn)定放電、穩(wěn)定電暈放電、放電受阻三個(gè)基本過程;多針電極結(jié)構(gòu)與單針電極相比,起暈電壓低,火花擊穿電壓高,放電穩(wěn)定性較好;(2)針板間距為20mm,針針間距為20mm時(shí)脈沖放電的單脈沖注入能量達(dá)到最大,且最大脈沖注入功率密度達(dá)到極值;當(dāng)脈沖峰值電壓為17k V,重復(fù)頻率為40Hz,氣體流量為0.3L/min且反向進(jìn)氣時(shí),單獨(dú)電暈放電降解甲醛的效果達(dá)到本實(shí)驗(yàn)條件下最佳,甲醛降解率和能量效率分別為86.1%,3.19g/(k W·h)。(3)脈沖電暈放電協(xié)同Mn-Ti、Fe-Ti、Cu-Ti催化劑時(shí),其降解順序?yàn)镸n-TiCu-TiFe-Ti無催化劑,其中Mn-Ti催化劑協(xié)同效果較好,相比無催化劑時(shí),甲醛降解率和能量效率分別為92.6%和3.51 g/(k W·h),O3產(chǎn)量由175 mg/m3下降至50mg/m3,CO2選擇性由22%上升至38%;相比Mn-Ti催化劑而言,Ag-Mn-Ti催化劑進(jìn)一步改善和提高了甲醛降解效果,且光催化協(xié)同效果達(dá)到本實(shí)驗(yàn)條件下最佳,甲醛降解率和能量效率依次為98.6%、3.65g/(k W·h),O3產(chǎn)量為35mg/m3,CO2選擇性達(dá)48%。通過實(shí)驗(yàn)優(yōu)化了多針-板高壓脈沖電暈放電反應(yīng)器的各項(xiàng)配置參數(shù),并采用優(yōu)化后的反應(yīng)器協(xié)同不同催化劑對甲醛進(jìn)行降解研究,為脈沖放電協(xié)同催化劑降解工業(yè)廢氣的實(shí)際應(yīng)用提供一定的理論參考。
[Abstract]:In recent years, volatile organic compounds (VOCs), such as formaldehyde, are volatile Organic Compounds. VOCs) seriously endanger people's physical and mental health and living environment. The application of pulse discharge synergistic catalysis technology in the degradation of formaldehyde has shown the advantages of high efficiency, less by-products, stable operation and so on. But how to optimize the structure of pulsed discharge reactor to improve the utilization of discharge energy. In this paper, the structure optimization and degradation of formaldehyde in a multi-needle plate high-pressure pulse discharge reactor were studied. The self-made high-voltage pulse corona discharge reactor was used in the experiment. The electrode configuration (needle plate spacing, needle needle spacing) was optimized by studying the discharge characteristics of the reactor under different electrode structures. Under the optimized electrode configuration, the electrode configuration was further investigated. The effects of electrical parameters (pulse peak voltage, repetition rate, gas flow rate, inlet direction) on the energy injection of pulse discharge and the degradation of formaldehyde were studied. The optimized reactor was used. The effects of pulse corona discharge (PCD) and transition metal (Mn-Mn-Fe-Cu), noble metal (Ag) catalyst on the CO _ 2 selectivity and energy efficiency of O _ 3 / O _ 3 yield in formaldehyde degradation rate were studied. The degradation mechanism of formaldehyde is discussed. The results show that the pulse discharge has three basic processes: unstable discharge, stable corona discharge and blocked discharge. Compared with single needle electrode, the structure of multi-needle electrode has lower halo voltage, higher spark breakdown voltage and better discharge stability. (2) the maximum single pulse injection energy and maximum pulse injection power density are obtained when the spacing of needle and needle is 20mm and 20mm respectively. When the pulse peak voltage is 17 kV, the repetition rate is 40 Hz, the gas flow rate is 0.3 L / min and the reverse inlet, the effect of single corona discharge on formaldehyde degradation is the best in this experiment. The degradation rate and energy efficiency of formaldehyde were 86.1% and 3.19 g / kg 路kW 路h ~ (-1) ~ (3) pulse corona discharge combined with Mn-Ti-Fe-Ti-Cu-Ti catalyst. The degradation order was Mn-TiCu-TiFe-Ti without catalyst, and the synergistic effect of Mn-Ti catalyst was better than that without catalyst. The degradation rate and energy efficiency of formaldehyde were 92.6% and 3.51 g / h respectively, and the yield of O _ 3 decreased from 175 mg/m3 to 50 mg / m ~ 3. The selectivity of CO2 increased from 22% to 38. Compared with Mn-Ti catalyst, Ag-Mn-Ti catalyst further improved the degradation efficiency of formaldehyde, and the photocatalytic synergistic effect reached the best in this experiment. The degradation rate and energy efficiency of formaldehyde were 98.6% and 3.65g / kg 路hmm3, respectively. The yield of O _ 3 was 35mg / m ~ 3. The selectivity of CO2 is up to 48. The configuration parameters of multi-needle plate high pressure pulse corona discharge reactor are optimized, and the degradation of formaldehyde is studied by the optimized reactor and different catalysts. It provides a theoretical reference for the practical application of pulsed discharge co-catalyst in the degradation of industrial waste gas.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X51;O646.7

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