本文選題：電流效率　切入點(diǎn)：硫氰酸銨　出處：《東南大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：尿素／氨混合溶液同時(shí)脫硫脫硝工藝具有非常高的脫硫效率和較高的脫硝效率,且其循環(huán)吸收液中硫酸銨的含量高達(dá)82%。采用電化學(xué)方法將循環(huán)吸收液中的硫酸銨制備成具有高附加值的過(guò)硫酸銨,是尿素／氨混合溶液同時(shí)脫硫脫硝工藝資源化回收利用的具有發(fā)展前景的研究課題和方向。本文在自制的電解實(shí)驗(yàn)裝置上,陰極材料分別采用鉛板和未見(jiàn)于報(bào)道的鈦板,對(duì)硫酸銨電解過(guò)程中工藝參數(shù)(電解電壓、反應(yīng)物濃度、添加劑、反應(yīng)時(shí)間等)的影響特性進(jìn)行了實(shí)驗(yàn)研究,研究發(fā)現(xiàn)鈦板能夠在低于鉛板的電解工藝參數(shù)下獲得較高的電流效率和轉(zhuǎn)化率。分別在鈦板和鉛板的最佳電解條件下進(jìn)行電解,發(fā)現(xiàn)采用鈦板4h后電流效率為60.16%,而鉛板的電流效率僅為52.17%。上述研究結(jié)果表明,鈦板是一種可替代鉛板的新型陰極材料。此外,考慮到尿素／氨混合溶液同時(shí)脫硫脫硝工藝循環(huán)吸收液中的成分,本文以鈦板為陰極板,篩選了尿素、氯化銨、聚磷酸銨和硫氰酸銨及其交叉配比的混合添加劑進(jìn)行電解性能的實(shí)驗(yàn)研究。實(shí)驗(yàn)發(fā)現(xiàn),四種單一添加劑對(duì)電解的促進(jìn)作用依次為硫氰酸銨尿素聚磷酸銨氯化銨。采用動(dòng)態(tài)法進(jìn)行性能對(duì)比發(fā)現(xiàn),聚磷酸銨可以緩解電流效率隨時(shí)間的下降；采用質(zhì)量濃度0.1%的尿素與質(zhì)量濃度0.25%的聚磷酸銨配比的混合添加劑對(duì)電解的促進(jìn)效果最好,其對(duì)應(yīng)的電流效率達(dá)到86.77%,優(yōu)于二者任意單一添加劑對(duì)電解的促進(jìn)作用。由于電解過(guò)硫酸銨結(jié)晶余液中含有少量過(guò)硫酸銨,其對(duì)脫硝具有較大的促進(jìn)作用�；趯�(duì)尿素／氨混合溶液同時(shí)脫硫脫硝工藝吸收液電解制過(guò)硫酸銨結(jié)晶余液的綠色循環(huán)經(jīng)濟(jì)利用的考量,本文開(kāi)展了尿素／氨混合溶液同時(shí)脫硫脫硝工藝吸收液電解制過(guò)硫酸銨結(jié)晶余液循環(huán)脫硝的實(shí)驗(yàn)研究。同時(shí),由于氨基濕法煙氣脫硫效率已經(jīng)高達(dá)97%以上,而SO2對(duì)脫硝過(guò)程的影響主要體現(xiàn)在脫硫中間產(chǎn)物(NH4)2SO3上。因此,本文對(duì)電解硫酸銨的產(chǎn)物(過(guò)硫酸銨)和電解陽(yáng)極添加劑(硫氰酸銨和聚磷酸銨),以及它們與常用濕法脫硝添加劑(二乙醇胺、三乙醇胺)進(jìn)行配比的混合添加劑在亞硫酸銨／尿素溶液濕法脫硝性能方面進(jìn)行了實(shí)驗(yàn)研究。實(shí)驗(yàn)發(fā)現(xiàn),過(guò)硫酸銨的脫硝效果比硫氰酸銨的脫硝效果好。過(guò)硫酸銨是通過(guò)對(duì)NO的氧化來(lái)促進(jìn)脫硝的；而硫氰酸銨是通過(guò)氧氣對(duì)自身的的氧化作用促進(jìn)脫硝過(guò)程的,且過(guò)量添加不利于脫硝過(guò)程,還會(huì)污染環(huán)境。因此,本文認(rèn)為硫氰酸銨不適合作為尿素／氨混合溶液同時(shí)脫硫脫硝工藝吸收液電解法制過(guò)硫酸銨工藝和濕法脫硝過(guò)程的添加劑。過(guò)硫酸銨與二乙醇胺和三乙醇胺配比組成的混合添加劑對(duì)脫硝有明顯的促進(jìn)作用,但二乙醇胺與三乙醇胺的價(jià)格高,不利于降低脫硝系統(tǒng)成本。由于過(guò)硫酸銨和聚磷酸銨組成的混合添加劑對(duì)脫硝效率的促進(jìn)作用優(yōu)于二者任意單一添加劑,在質(zhì)量濃度0.02%的聚磷酸銨中添加劑質(zhì)量濃度0.05%過(guò)硫酸銨,30min內(nèi)的平均脫硝效率達(dá)到51%。因此,本文認(rèn)為將尿素和聚磷酸銨作為尿素／氨混合溶液同時(shí)脫硫脫硝工藝吸收液電解法制過(guò)硫酸銨工藝的添加劑,將過(guò)硫酸銨和聚磷酸銨作為尿素／氨混合溶液濕法脫硝工藝的添加劑是經(jīng)濟(jì)、綠色的,具有較高的工程應(yīng)用前景和學(xué)術(shù)研究?jī)r(jià)值。
[Abstract]:Simultaneous desulfurization and denitration efficiency of urea / ammonia mixed solution denitrification process has very high desulfurization efficiency and higher, and the content of ammonium sulfate solution in the absorption cycle up to 82%. by electrochemical method in circulating absorption liquid of ammonium sulfate was prepared with high added value of ammonium persulfate, is off topic and direction denitrification process resource recycling with the development of future study on simultaneous desulfurization and ammonia / urea mixed solution. The electrolysis of self-made experimental device, titanium plate cathode materials were used and it has not been found in the report, the ammonium sulfate electrolysis process parameters (voltage, concentration of reactants, additives, reaction time etc.) effect was investigated, the study found that titanium plate can obtain higher current efficiency and conversion rate in the electrolytic process parameters under the solution conditions. It is lower than that in the best electric titanium plate and lead respectively. By electrolysis, using titanium plate after 4h, the current efficiency is 60.16%, and the current efficiency of it is only 52.17%. the results of the study show that titanium plate is a new type of cathode material can replace it. In addition, taking into account the denitrification process in circulating absorption liquid urea / ammonia desulfurization and composition of mixed solution, this paper titanium plate as the cathode plate, the screening of urea, ammonium chloride, experimental study of mixed additives of ammonium polyphosphate and ammonium thiocyanate and cross ratio of electrolytic performance. The experimental results showed that, four kinds of single additives on electrolytic role in ammonium thiocyanate poly urea ammonium phosphate ammonium chloride. The performance comparison with dynamic method ammonium polyphosphate, can alleviate the current efficiency with time decreased by 0.1%; the concentration of urea and concentration of 0.25% poly ammonium phosphate ratio of mixed additives on electrolytic effect best, the The current efficiency reached 86.77%, two better than any single additives on electrolytic role. Because electrolyte crystallization of ammonium sulfate in the raffinate containing a small amount of ammonium persulfate, has a greater role in promoting denitrification. The urea / ammonia mixed solution of simultaneous desulfurization and denitrification process of absorption liquid electrolysis preparation of ammonium persulfate over crystallization the green liquid recycling based on the consideration, this paper carried out the urea / ammonia mixture experimental study on simultaneous desulfurization and denitrification process of absorption liquid electrolysis preparation of ammonium persulfate crystallization more than liquid circulation denitration. At the same time, the desulfurization efficiency of wet flue gas - has reached more than 97%, while the effect of SO2 on denitration process mainly reflected in the desulfurization of intermediate product (NH4) 2SO3. Therefore, the product of electrolysis of ammonium sulfate (ammonium persulfate) and electrolyte additives (ammonium thiocyanate and ammonium polyphosphate), and their common wet denitration Tim With the agent (two ethanol, triethanolamine) was studied in mixed additive ratio denitrification performance in ammonium sulfite / urea solution wet. Experiments showed that the denitrification effect of ammonium persulfate than denitrification effect of ammonium thiocyanate. The ammonium persulfate is through the oxygen of the NO to promote off the nitrate and ammonium thiocyanate; through oxidation of oxygen to promote its denitration process, and the excessive addition is not conducive to the denitrification process, but also pollute the environment. Therefore, this paper thinks that ammonium thiocyanate is not suitable as urea / ammonia mixed solution of simultaneous desulfurization and denitrification process of absorption liquid by electrolysis process and ammonium persulfate wet Denitration Process additives. Mixed additives of ammonium persulfate and two ethanol amine and triethanolamine composition has obvious promoting effect on denitrification, but two ethanol with triethanolamine price is high, is not conducive to reducing denitration system Cost. Because the mixed additives of ammonium persulfate and ammonium polyphosphate on denitration efficiency promoting effect is better than the two in any single additive concentration of 0.02% poly 0.05% additive concentration of ammonium phosphate in ammonium persulfate, 30min average denitration efficiency reached 51%. therefore, the urea and ammonium polyphosphate at the same time as urea / ammonia mixed solution desulfurization additive denitrification process of absorption liquid by electrolysis process of ammonium persulfate, the ammonium persulfate and ammonium polyphosphate as additives for urea / ammonia mixed solution wet denitration technology is economic, green, value engineering application and academic research is very high.

【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X773

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