本文關(guān)鍵詞：吸附樹(shù)脂真空變壓吸附法處理丙酮?dú)怏w研究　出處：《南京大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 超高交聯(lián)吸附樹(shù)脂 真空變壓吸附 吹掃氣 丙酮

【摘要】：吸附法由于去除效率高、工藝簡(jiǎn)單、可回收有機(jī)溶劑及一次投資成本低等優(yōu)點(diǎn),是當(dāng)前國(guó)內(nèi)外用于回收廢氣中揮發(fā)性有機(jī)物(VOCs)的主流技術(shù)。水蒸氣變溫吸附和真空變壓吸附是吸附法處理VOCs最常用的兩種工藝,相比水蒸氣變溫吸附工藝,真空變壓吸附工藝可以對(duì)脫附下的水溶性VOCs直接冷凝回收,具有無(wú)二次污染、能耗低等優(yōu)點(diǎn)。超高交聯(lián)吸附樹(shù)脂具有穩(wěn)定的機(jī)械強(qiáng)度、可根據(jù)被吸附組分調(diào)控的孔結(jié)構(gòu)、良好的吸附-脫附性能等優(yōu)點(diǎn),在吸附處理VOCs上逐漸成為研究熱點(diǎn)。本文選用超高交聯(lián)吸附樹(shù)脂HCP-001作為吸附劑,以工業(yè)上常用的水溶性有機(jī)溶劑丙酮為研究對(duì)象,開(kāi)展了超高交聯(lián)吸附樹(shù)脂變壓吸附特性研究。主要的研究?jī)?nèi)容和結(jié)果如下：(1)采用柱吸附-脫附裝置,研究了丙酮在超高交聯(lián)吸附樹(shù)脂HCP-001上的等溫變壓吸附特性。實(shí)驗(yàn)結(jié)果表明：丙酮在超高交聯(lián)吸附樹(shù)脂HCP-001上的吸附量,隨著丙酮?dú)怏w濃度的提高而增大,隨著吸附溫度升高而降低。真空度、脫附溫度、吸附時(shí)丙酮濃度等是影響丙酮真空脫附效率的重要因素。真空度越高,脫附率越高,真空度為98kPa時(shí)脫附率比真空度90kPa增加25.3%;脫附溫度越高越有利于丙酮脫附,脫附溫度60℃時(shí)脫附率達(dá)到85.3%,相比脫附溫度30℃時(shí)增加53.3%；吸附時(shí)丙酮濃度越高,脫附率越高,這可能是因?yàn)榈蜐舛缺饕晃皆谖⒖?而濃度較高的丙酮不僅在微孔內(nèi)發(fā)生吸附,而且在中孔內(nèi)也發(fā)生了吸附；由于微孔比中孔具有更大的吸附勢(shì),因而吸附在中孔內(nèi)丙酮相比微孔內(nèi)丙酮更易脫附,導(dǎo)致吸附高濃度丙酮的樹(shù)脂比吸附低濃度丙酮具有更高脫附率;吸附-脫附兩操作之間靜置時(shí)間對(duì)脫附有一定的影響,靜置時(shí)間越長(zhǎng)脫附率越低,這主要是因?yàn)楸诔呓宦?lián)吸附樹(shù)脂上吸附,主要受孔內(nèi)擴(kuò)散控制,吸附穿透時(shí)并沒(méi)有達(dá)到平衡狀態(tài),被吸附的丙酮分子繼續(xù)向吸附作用勢(shì)更強(qiáng)的微孔內(nèi)吸附位點(diǎn)擴(kuò)散,強(qiáng)的吸附作用力導(dǎo)致脫附率和脫附速率的下降。此外,還對(duì)比研究了氮?dú)獯祾叩拿摳教匦?吹掃氣量越大、溫度越高,脫附率和初始脫附速率越高;熱氮?dú)獯祾呙摳铰时日婵彰摳礁?但脫附下的丙酮濃度較低,不利于后續(xù)的回收。(2)采用擬絕熱吸附裝置,通過(guò)檢測(cè)超高交聯(lián)吸附樹(shù)脂HCP-001吸附、脫附丙酮過(guò)程中床層溫度和出口濃度變化,研究丙酮在超高交聯(lián)吸附樹(shù)脂上的擬絕熱變壓吸附特性。實(shí)驗(yàn)結(jié)果表明：吸附時(shí)丙酮濃度越高,穿透時(shí)間越短,床層溫升越高；真空脫附過(guò)程中,吸附時(shí)丙酮濃度越高,脫附率越低,這是由于吸附時(shí)丙酮濃度越高,脫附過(guò)程中床層溫度降低越多,較低的床層溫度導(dǎo)致了低脫附率；真空度越高,脫附率越高,脫附氣濃度越高。此外,還比較研究了氮?dú)獯祾叩拿摳教匦?吹掃氣量越大、吹掃氣溫度越高,脫附率越高,脫附率高于真空脫附效率;但是,相比于真空脫附方法,吹掃氣脫附下的丙酮濃度較低,不利于后續(xù)的回收。(3)針對(duì)常規(guī)真空變壓吸附工藝,開(kāi)展了吹掃氣輔助真空脫附和床層內(nèi)置換熱管變壓吸附改進(jìn)研究。實(shí)驗(yàn)結(jié)果表明：吹掃氣輔助真空脫附可提高脫附效果,“真空+氮?dú)忾g歇吹掃”、“先真空+后吹掃”和“先吹掃+后真空”的脫附率皆高于單一真空脫附,其中采用“真空+氮?dú)忾g歇吹掃”進(jìn)行脫附時(shí),脫附氣中丙酮濃度最高且脫附率最高,脫附率比只采用真空脫附增加28.91%。吸附床內(nèi)置換熱管對(duì)吸附和脫附效率都有提高,吸附時(shí)通入20℃的冷卻水,可將床層最高溫升降低3.8℃,而且增加了吸附樹(shù)脂的穿透吸附能力,穿透時(shí)間延長(zhǎng)37.4%；脫附時(shí)通入60℃的熱水,提高了脫附氣中丙酮的濃度,而且相比無(wú)加熱脫附,脫附率提高約10%。
[Abstract]:Adsorption is a mainstream technology for recovering volatile organic compounds (VOCs) from waste gas at home and abroad due to its high removal efficiency, simple process, recyclable organic solvents and low investment cost. Steam temperature swing adsorption and vacuum pressure swing adsorption are two most commonly used VOCs processes for adsorption. Compared with steam temperature swing adsorption process, vacuum pressure swing adsorption process can directly recover condensed water soluble VOCs from desorption, and has the advantages of no two times pollution and low energy consumption. Super high crosslinked adsorption resin has stable mechanical strength and can be controlled according to the pore structure of adsorption components, and has good adsorption and desorption properties. It has gradually become a research hotspot in adsorption treatment of VOCs. In this paper, super high crosslinking adsorption resin HCP-001 was used as adsorbent, and the water soluble organic solvents acetone in industry as the research object, the pressure swing adsorption characteristics of super high crosslinked adsorption resin were studied. The main research contents and results are as follows: (1) the adsorption characteristics of acetone on the super high crosslinking adsorption resin HCP-001 were studied by column adsorption desorption device. The experimental results show that the adsorption amount of acetone on the super high crosslinking adsorption resin HCP-001 increases with the increase of acetone gas concentration, and decreases with the increase of adsorption temperature. The vacuum degree, the desorption temperature, the concentration of acetone and so on are the important factors that affect the efficiency of the acetone vacuum desorption. The higher the vacuum, the desorption rate is high, the vacuum degree of 98kPa desorption rate is 25.3% higher than the vacuum desorption temperature of 90kPa; more conducive to acetone desorption, desorption temperature of 60 DEG C when the desorption rate reached 85.3%, compared to the desorption temperature of 30 DEG C when the increase of 53.3%; when the concentration of acetone adsorption high desorption rate is high, it may be because of the low concentration of acetone was the main adsorption in micropores, and the higher concentration of acetone in the micropore adsorption occurs not only, but also in the hole also occurred due to micropore adsorption; adsorption potential is greater than the hole, the hole in the adsorption of acetone is more easily in the desorption phase than microporous resin adsorption of high concentration lead to acetone, acetone has a high rate of adsorption of low concentration acetone; adsorption desorption between the two operation time on the removal of a certain impact, the longer the static desorption rate is low, this is mainly because the acetone in the high-crosslinked Adsorption on resin is mainly controlled by pore diffusion, and the equilibrium state is not reached when adsorption is penetrating. The adsorbed acetone molecules continue to move towards the adsorption sites with stronger adsorption force, and strong adsorption force leads to the decrease of desorption rate and desorption rate. In addition, the desorption characteristics of nitrogen purging were compared. The higher the purging volume and the higher the temperature, the higher the desorption rate and the initial desorption rate. The purging desorption rate of hot nitrogen is higher than that of vacuum desorption, but the acetone concentration under desorption is low, which is not conducive to subsequent recovery. (2) the quasi adiabatic adsorption device, by detecting the hypercrosslinked resin HCP-001 adsorption, desorption of acetone of the bed temperature and outlet concentration, pseudo adiabatic pressure swing adsorption in the hypercrosslinked resin on acetone. The experimental results show that the adsorption of acetone concentration is high, the breakthrough time is shorter, the bed temperature rise high; vacuum desorption process, the adsorption of acetone concentration is higher, the lower the desorption rate, which is due to the adsorption of acetone concentration, desorption of the bed temperature decreased, the bed temperature is low leads to low desorption rate; the higher the vacuum, the desorption rate is higher, the higher the concentration of gas desorption. In addition, the desorption characteristics of nitrogen purging were also compared. The higher the purging gas volume and the higher the purging gas temperature, the higher the desorption rate, the higher the desorption rate than the vacuum desorption efficiency. However, compared with the vacuum desorption method, the acetone concentration under purge gas desorption is low, which is not conducive to subsequent recovery. (3) aiming at the conventional vacuum pressure swing adsorption process, the improvement of the vacuum desorption of blowing gas and the pressure swing adsorption of the inner heat transfer tube of the bed are carried out. The experimental results show that the purge gas assisted vacuum desorption can improve desorption effect, "vacuum intermittent + nitrogen purge" and "first vacuum + Post purge" and the "first purge + after vacuum desorption rate is higher than that of the vacuum desorption, which adopted the" vacuum batch + nitrogen purge "for desorption, removal of gas in the highest concentration of acetone and the removal of the highest rate, desorption rate than the vacuum desorption increased by 28.91%. The adsorption bed built-in heat pipe on the adsorption and desorption efficiency are improved, the cooling water adsorption into 20 DEG, 3.8 DEG C can be reduced or the bed temperature, but also increase the adsorption resin adsorption capacity, penetration time increased 37.4%; desorption by introducing 60 DEG C hot water, improve the concentration of deacetone gas, and compared with no heating desorption, desorption rate increased about 10%.
【學(xué)位授予單位】：南京大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：X701

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 吳金保;;煤層氣變壓吸附濃縮甲烷吸附劑的研究進(jìn)展[J];煤質(zhì)技術(shù);2016年01期

2 蔣e，

本文編號(hào)：1340977