【摘要】：天然氣的高效清潔利用是各國優(yōu)化能源結(jié)構(gòu)的重要措施。氫能與電能的制備是實現(xiàn)天然氣清潔利用的重要方式,但傳統(tǒng)制氫工藝能耗高,燃燒發(fā)電系統(tǒng)熱能損失嚴(yán)重�；�"品位對口,梯級利用"的原則,將燃燒效率高、CO2捕集零能耗的化學(xué)鏈燃燒發(fā)電技術(shù)與制氫產(chǎn)率大、CO2吸收率高的蒸汽強(qiáng)化重整制氫技術(shù)進(jìn)行耦合,利用高壓、低壓化學(xué)鏈系統(tǒng)的多余熱能為制氫系統(tǒng)中重整制氫和吸收再生環(huán)節(jié)供能,提出了以天然氣為原料的雙化學(xué)鏈燃燒耦合蒸汽重整氫電聯(lián)產(chǎn)工藝并進(jìn)行了研究。采用Aspen Plus對以天然氣為進(jìn)料的化學(xué)鏈燃燒發(fā)電工藝、蒸汽強(qiáng)化重整制氫工藝、化學(xué)鏈燃燒耦合蒸汽重整氫電聯(lián)產(chǎn)工藝(單級耦合)、雙化學(xué)鏈燃燒耦合蒸汽重整氫電聯(lián)產(chǎn)工藝(雙級耦合)進(jìn)行模擬,并分析主要操作參數(shù)如C02吸收劑CaO與天然氣制氫進(jìn)料的摩爾進(jìn)料比、水蒸氣與天然氣制氫進(jìn)料的摩爾比、單級耦合系統(tǒng)中天然氣分別作燃料與制氫進(jìn)料的分配比,以及雙級耦合系統(tǒng)中天然氣分別供應(yīng)給高壓化學(xué)鏈系統(tǒng)與低壓化學(xué)鏈系統(tǒng)作燃料與作制氫進(jìn)料的摩爾比等,對系統(tǒng)性能(氫氣產(chǎn)率、產(chǎn)品組成、發(fā)電量等)的影響,并在此基礎(chǔ)上實現(xiàn)工藝的優(yōu)化�；跓崃W(xué)第一定律和熱力學(xué)第二定律,得出:化學(xué)鏈燃燒發(fā)電工藝能量效率為55.79%,(火用)效率37.89%,(火用)損率為45.30%。蒸汽強(qiáng)化重整制氫工藝氫氣產(chǎn)率為65%,氫氣收率為15%,能量效率為23.52%,(火用)效率為89.18%,(火用)損率為15.82%�；瘜W(xué)鏈燃燒耦合蒸汽重整氫電聯(lián)產(chǎn)系統(tǒng)氫氣產(chǎn)率為89%,氫氣收率為17%,能量效率為57.86%,(火用)效率為67.04%,(火用)損率為29.34%;雙化學(xué)鏈燃燒耦合蒸汽重整氫電聯(lián)產(chǎn)系統(tǒng)氫氣產(chǎn)率達(dá)92%,氫氣收率為18%,能量效率為66.50%,(火用)效率為72.72%,(火用)損率為23.61%。
[Abstract]:The efficient and clean utilization of natural gas is an important measure to optimize energy structure in various countries. The preparation of hydrogen energy and electric energy is an important way to realize the clean utilization of natural gas, but the energy consumption of traditional hydrogen production process is high, and the thermal energy loss of combustion power generation system is serious. Based on the principle of "grade matching, cascade utilization", the chemical chain combustion power generation technology with high combustion efficiency and zero energy consumption by CO2 is coupled with the steam enhanced reforming hydrogen production technology with high hydrogen production rate and high CO2 absorptivity. The superfluous heat energy of low pressure chemical chain system is the energy supply of reforming hydrogen production and absorbing regeneration in hydrogen production system. The hydrogen electricity cogeneration process of double chemical chain combustion coupled steam reforming with natural gas as raw material is proposed and studied. The chemical chain combustion power generation process with natural gas as feedstock, steam enhanced reforming hydrogen production process, chemical chain combustion coupled steam reforming hydrogen electricity cogeneration process (single stage coupling) were adopted in this paper. Double chemical chain combustion coupled steam reforming hydrogen electricity cogeneration process (double stage coupling) is simulated, and the main operating parameters such as the molar feed ratio of CO2 absorbent CaO and natural gas hydrogen feed, the molar ratio of water vapor to natural gas hydrogen feed are analyzed. The distribution ratio of natural gas as fuel and hydrogen feedstock in single-stage coupling system, and the molar ratio of natural gas supplied to high-pressure chemical chain system and low-pressure chemical chain system to hydrogen production feed respectively in two-stage coupling system, etc. The effect on system performance (hydrogen yield, product composition, power generation etc.) and process optimization. Based on the first law of thermodynamics and the second law of thermodynamics, it is concluded that the energy efficiency of the chemical chain combustion power generation process is 55.79, the exergy efficiency is 37.89 and the exergy loss rate is 45.30. The hydrogen yield, energy efficiency, exergy efficiency and exergy loss rate of steam enhanced reforming process are 65, 15, 23.52, 89.18 and 15.82, respectively. The hydrogen yield, energy efficiency, exergy loss rate and exergy rate of the combined hydrogen production system are 89, 17, 57.86, 67.04 and 29.34, respectively. The hydrogen yield, energy efficiency, exergy loss rate and exergy loss rate of the hydrogen production system are 92, 18, 66.50, 72.72 and 23.61, respectively.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ116.2

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