三乙胺冷芯盒制芯尾氣處理技術的研究
發(fā)布時間：2018-12-15 23:18
【摘要】：三乙胺冷芯盒制芯是1968年由美國Ashland油脂化學公司向鑄造界推出的一種制芯技術,憑借其生產(chǎn)效率高、砂芯尺寸精度高、潰散性好、綜合成本低等眾多優(yōu)點,推出不久便受到國內(nèi)外鑄造行業(yè)的歡迎,并得到了廣泛的應用。時至今日,它已成為鑄造行業(yè)最常用的制芯工藝。但是,在三乙胺冷芯盒制芯過程中產(chǎn)生的含三乙胺尾氣,有毒,不僅污染了大氣環(huán)境,而且對人的身體健康有害。采用經(jīng)濟、有效的方法解決三乙胺冷芯盒制芯過程中產(chǎn)生的含三乙胺尾氣污染及胺回收問題,對鑄造行業(yè)可持續(xù)發(fā)展和我國的生態(tài)文明建設具有重要的現(xiàn)實意義。目前,有機廢氣處理的方法有液體吸收法、吸附法、燃燒法、膜分離法、冷凝法、生物法、等離子體法等,但是針對鑄造生產(chǎn)中產(chǎn)生的含三乙胺尾氣治理問題的研究少見報道。為解決三乙胺冷芯盒制芯尾氣處理及胺回收問題,本課題先后開展了活性炭吸附三乙胺可行性研究、活性炭吸附三乙胺后的脫附技術研究和冷凝法回收三乙胺技術研究,確定了“活性炭吸附+脫附+冷凝回收”的冷芯盒制芯含三乙胺尾氣處理的技術方案,通過活性炭吸附解決三乙胺有機廢氣處理問題,然后將吸附的三乙胺從活性炭中解附出來,通過冷凝的方式加以回收,從而實現(xiàn)了冷芯盒制芯過程中含三乙胺尾氣凈化及胺的回收。對活性炭吸附三乙胺的吸附量、適宜吸附層厚度、脫附率、回收率等相關參數(shù)進行了實驗研究,發(fā)現(xiàn)活性炭對三乙胺的吸附量隨活性炭層厚度的增加而增加,當吸附飽和時,單位質量活性炭吸附三乙胺的量為0.0389g/g；三乙胺尾氣中胺的去除率隨活性炭厚度的增加而增加,當活性炭厚度達到65mm時,三乙胺尾氣中胺的去除率達到100%；吸附三乙胺后活性炭的胺脫附率隨脫附時間的延長呈現(xiàn)先急劇增加,后趨于平緩的變化趨勢,胺脫附率不隨活性炭吸附-脫附三乙胺次數(shù)的增加而變化；脫附后三乙胺的回收率隨空胺比的增加而降低,隨冷凝水溫度的降低而升高。依據(jù)三乙胺冷芯盒制芯尾氣處理及胺回收技術方案和實驗研究所得到的結果,開發(fā)了一種具有胺回收功能的三乙胺尾氣處理裝置。該裝置由預處理器、尾氣處理器和胺回收器三部分組成,預處理器是用于將尾氣中夾雜的粉塵等固體顆粒去除；尾氣處理器是利用活性炭對有機氣體的吸附性,將尾氣中三乙胺吸附下來,使之得到凈化,然后利用活性炭的脫附性,將三乙胺從活性炭中解附出來；胺回收器是將脫附出的三乙胺氣體液化成液體,進而將其回收,從而解決了三乙胺冷芯盒制芯尾氣的處理問題,同時又實現(xiàn)了三乙胺的回收利用。
[Abstract]:Triethylamine cold core box core-making is a kind of core-making technology introduced by Ashland Oil Chemical Company of America in 1968. It has many advantages, such as high production efficiency, high precision of sand core size, good collapsibility and low comprehensive cost, etc. It was welcomed by the foundry industry at home and abroad soon after its launch and has been widely used. Today, it has become the foundry industry the most commonly used core-making process. However, the tail gas containing triethylamine produced in the core-making process of triethylamine cold box is toxic, which not only pollutes the atmospheric environment, but also is harmful to human health. Using economical and effective methods to solve the pollution of triethylamine tail gas and the recovery of triethylamine in the core-making process of triethylamine cold core box has important practical significance for the sustainable development of foundry industry and the construction of ecological civilization in China. At present, organic waste gas treatment methods include liquid absorption method, adsorption method, combustion method, membrane separation method, condensation method, biological method, plasma method, etc. However, there are few reports on the treatment of tail gas containing triethylamine in foundry production. In order to solve the problems of tail gas treatment and amine recovery in the core-making of triethylamine, the feasibility of activated carbon adsorption of triethylamine, the desorption of triethylamine by activated carbon and the recovery of triethylamine by condensation were studied. The technical scheme for the treatment of tail gas containing triethylamine in the core of "adsorption and desorption of activated carbon and condensate recovery" was determined, and the treatment problem of organic waste gas of triethylamine was solved by adsorption of activated carbon. Then, the adsorbed triethylamine was desorbed from the activated carbon and recovered by condensation, thus the tail gas purification and amine recovery were realized in the core-making process of the cold core box. The adsorption amount of triethylamine on activated carbon, suitable adsorption layer thickness, desorption rate and recovery rate were studied experimentally. It was found that the adsorption amount of triethylamine on activated carbon increased with the thickness of activated carbon layer, and when the adsorption was saturated, the adsorption capacity of triethylamine on activated carbon increased with the increase of the thickness of activated carbon layer. The amount of triethylamine adsorbed by activated carbon per unit mass is 0.0389g / g; The removal rate of amine in tail gas of triethylamine increased with the increase of the thickness of activated carbon. When the thickness of activated carbon reached 65mm, the removal rate of amine in tail gas of triethylamine reached 100. After adsorption of triethylamine, the desorption rate of activated carbon increased sharply with the prolongation of desorption time, and then tended to be gentle, and the desorption rate of amine did not change with the increase of the number of times of adsorption and desorption of triethylamine. The recovery of triethylamine after desorption decreased with the increase of air-amine ratio and increased with the decrease of condensation water temperature. A triethylamine tail gas treatment unit with the function of amine recovery was developed according to the technical scheme and experimental results of core-making tail gas treatment of triethylamine cold core box. The device consists of three parts: preprocessor, tail gas processor and amine collector. The preprocessor is used to remove the dust and other solid particles in the tail gas. The tail gas processor uses activated carbon to adsorb organic gas, adsorbs triethylamine from tail gas, makes it purify, and then uses the desorption property of activated carbon to remove triethylamine from activated carbon. The amine collector liquefies the desorption triethylamine gas into a liquid and then reclaims it, thus solving the problem of treating the tail gas from the core making of the cold core box of triethylamine, and at the same time realizing the recovery and utilization of the triethylamine.
【學位授予單位】：山東建筑大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG242.7
本文編號：2381447
[Abstract]:Triethylamine cold core box core-making is a kind of core-making technology introduced by Ashland Oil Chemical Company of America in 1968. It has many advantages, such as high production efficiency, high precision of sand core size, good collapsibility and low comprehensive cost, etc. It was welcomed by the foundry industry at home and abroad soon after its launch and has been widely used. Today, it has become the foundry industry the most commonly used core-making process. However, the tail gas containing triethylamine produced in the core-making process of triethylamine cold box is toxic, which not only pollutes the atmospheric environment, but also is harmful to human health. Using economical and effective methods to solve the pollution of triethylamine tail gas and the recovery of triethylamine in the core-making process of triethylamine cold core box has important practical significance for the sustainable development of foundry industry and the construction of ecological civilization in China. At present, organic waste gas treatment methods include liquid absorption method, adsorption method, combustion method, membrane separation method, condensation method, biological method, plasma method, etc. However, there are few reports on the treatment of tail gas containing triethylamine in foundry production. In order to solve the problems of tail gas treatment and amine recovery in the core-making of triethylamine, the feasibility of activated carbon adsorption of triethylamine, the desorption of triethylamine by activated carbon and the recovery of triethylamine by condensation were studied. The technical scheme for the treatment of tail gas containing triethylamine in the core of "adsorption and desorption of activated carbon and condensate recovery" was determined, and the treatment problem of organic waste gas of triethylamine was solved by adsorption of activated carbon. Then, the adsorbed triethylamine was desorbed from the activated carbon and recovered by condensation, thus the tail gas purification and amine recovery were realized in the core-making process of the cold core box. The adsorption amount of triethylamine on activated carbon, suitable adsorption layer thickness, desorption rate and recovery rate were studied experimentally. It was found that the adsorption amount of triethylamine on activated carbon increased with the thickness of activated carbon layer, and when the adsorption was saturated, the adsorption capacity of triethylamine on activated carbon increased with the increase of the thickness of activated carbon layer. The amount of triethylamine adsorbed by activated carbon per unit mass is 0.0389g / g; The removal rate of amine in tail gas of triethylamine increased with the increase of the thickness of activated carbon. When the thickness of activated carbon reached 65mm, the removal rate of amine in tail gas of triethylamine reached 100. After adsorption of triethylamine, the desorption rate of activated carbon increased sharply with the prolongation of desorption time, and then tended to be gentle, and the desorption rate of amine did not change with the increase of the number of times of adsorption and desorption of triethylamine. The recovery of triethylamine after desorption decreased with the increase of air-amine ratio and increased with the decrease of condensation water temperature. A triethylamine tail gas treatment unit with the function of amine recovery was developed according to the technical scheme and experimental results of core-making tail gas treatment of triethylamine cold core box. The device consists of three parts: preprocessor, tail gas processor and amine collector. The preprocessor is used to remove the dust and other solid particles in the tail gas. The tail gas processor uses activated carbon to adsorb organic gas, adsorbs triethylamine from tail gas, makes it purify, and then uses the desorption property of activated carbon to remove triethylamine from activated carbon. The amine collector liquefies the desorption triethylamine gas into a liquid and then reclaims it, thus solving the problem of treating the tail gas from the core making of the cold core box of triethylamine, and at the same time realizing the recovery and utilization of the triethylamine.
【學位授予單位】：山東建筑大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG242.7
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