本文選題：化學(xué)吸附 + 吸附制冷��； 參考：《中南大學(xué)》2014年碩士論文

【摘要】：摘要：內(nèi)燃機(jī)尾氣是一種可以充分利用的高溫余熱資源,其帶出的熱量相當(dāng)于內(nèi)燃機(jī)所用燃油發(fā)熱值的30%左右,對(duì)其進(jìn)行余熱回收利用具有極大的社會(huì)經(jīng)濟(jì)意義。吸附式制冷是一種環(huán)境友好的、可利用低品位能源的綠色制冷技術(shù),非常符合運(yùn)載工具內(nèi)燃機(jī)尾氣余熱的回收利用場(chǎng)合。本文采用吸附式制冷方式應(yīng)用于內(nèi)燃機(jī)尾氣的余熱回收,應(yīng)用數(shù)值模擬的方法對(duì)吸附式制冷系統(tǒng)的運(yùn)行特性進(jìn)行分析。 首先,根據(jù)吸附工質(zhì)對(duì)的性能和吸附式制冷系統(tǒng)的循環(huán)方式特點(diǎn)確定了適合內(nèi)燃機(jī)尾氣余熱利用的吸附工質(zhì)對(duì)(氯化鈣—氨)和循環(huán)方式(三床連續(xù)循環(huán)),并提出提高系統(tǒng)效率的回?zé)帷⒒刭|(zhì)循環(huán)。 其次,在平衡吸附的前提下,從熱力學(xué)角度對(duì)三床吸附式制冷系統(tǒng)理想循環(huán)中的各個(gè)過程進(jìn)行了能量分析,并根據(jù)氯化鈣—氨的吸附特性分析了處于不同溫度范圍、不同蒸發(fā)溫度、不同冷凝溫度和采用回?zé)�、回質(zhì)循環(huán)的系統(tǒng)循環(huán)性能的特點(diǎn)。 再次,基于非平衡吸附特性,建立了吸附床的傳熱傳質(zhì)數(shù)學(xué)模型,并利用fluent軟件對(duì)其進(jìn)行求解分析,討論了吸附床內(nèi)溫度分布規(guī)律與運(yùn)行過程中的溫度變化規(guī)律,并對(duì)影響床內(nèi)溫度分布的參數(shù)與吸附量的關(guān)系進(jìn)行了分析。 最后,研究了內(nèi)燃機(jī)尾氣驅(qū)動(dòng)的氯化鈣—氨化學(xué)吸附式制冷系統(tǒng)的動(dòng)態(tài)運(yùn)行特性。通過建立熱力學(xué)動(dòng)態(tài)數(shù)學(xué)模型,仿真得到吸附床溫度、蒸發(fā)溫度、冷凝溫度、蒸發(fā)器與冷凝器出口溫度在系統(tǒng)運(yùn)行時(shí)的變化,總結(jié)了在變蒸發(fā)溫度或冷凝溫度下系統(tǒng)性能參數(shù)的變化規(guī)律,并對(duì)采用回?zé)�、回質(zhì)循環(huán)對(duì)系統(tǒng)性能影響進(jìn)行了初步分析。 本文的結(jié)論可以為今后有關(guān)化學(xué)吸附式制冷系統(tǒng)各部件的匹配性和優(yōu)化系統(tǒng)性能的進(jìn)一步研究提供參考。
[Abstract]:Abstract: the exhaust gas of internal combustion engine is a kind of high temperature waste heat resource which can be fully utilized. The heat produced by it is about 30% of the heating value of the fuel used in the internal combustion engine. It is of great social and economic significance to recycle the waste heat from the exhaust gas of the internal combustion engine. Adsorption refrigeration is an environment-friendly, low-grade energy green refrigeration technology, which is very suitable for the recovery and utilization of exhaust heat from internal combustion engine. In this paper, adsorption refrigeration method is used to recover waste heat from exhaust gas of internal combustion engine, and the operation characteristics of adsorption refrigeration system are analyzed by numerical simulation method. First According to the properties of adsorptive working pairs and the characteristics of the cycle mode of adsorption refrigeration system, the adsorption working pairs (calcium chloride ammonia) and the cycle mode (three-bed continuous cycle) suitable for the utilization of residual heat from tail gas of internal combustion engine were determined, and the improvement was proposed. The recovery of system efficiency, Return cycle. Secondly, on the premise of equilibrium adsorption, the energy analysis of each process in the ideal cycle of three-bed adsorption refrigeration system is carried out from the viewpoint of thermodynamics, and the adsorption characteristics of calcium chloride and ammonia are analyzed in different temperature range according to the adsorption characteristics of calcium chloride and ammonia. The characteristics of the system with different evaporation temperature, different condensing temperature and using regenerative and regenerative cycle. Thirdly, based on the characteristics of non-equilibrium adsorption, the mathematical model of heat and mass transfer of adsorption bed is established, and the temperature distribution in the adsorption bed and the temperature variation during operation are discussed by using fluent software. The relationship between the parameters affecting the temperature distribution in the bed and the adsorption capacity was analyzed. Finally, the dynamic operation characteristics of calcium chloride-ammonia chemisorption refrigeration system driven by internal combustion engine exhaust gas are studied. By establishing a thermodynamic dynamic mathematical model, the variations of adsorption bed temperature, evaporation temperature, condensation temperature and outlet temperature of evaporator and condenser during the operation of the system are obtained by simulation. The variation law of system performance parameters at variable evaporation temperature or condensing temperature is summarized, and the effect of regenerative and regenerative cycle on system performance is analyzed preliminarily. The conclusion of this paper can be used as a reference for further research on the matching of various components of chemisorption refrigeration system and the optimization of system performance.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TB657

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 ;Effect of surface modification of activated carbon on its adsorption capacity for NH_3[J];Journal of China University of Mining & Technology;2008年02期

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本文編號(hào)：2108602