Study on key technologies of solar energy photothermal conversion for heavy oil thermal recovery

doi:10.19799/j.cnki.2095-4239.2020.0047

Abstract

Abstract:

In order to promote the development of a solar photothermal conversion for heavy oil thermal recovery and reduce the development costs. The key technologies of heavy oil thermal recovery via tower solar photothermal conversion are systematically studied. This work demonstrates the feasibility of applying solar photothermal conversion technology in the main heavy oil-producing regions in China which gives the system composition of tower solar photothermal conversion heavy oil thermal recovery and optimizes the heat storage materials. This work focuses on the key equipment selection and design points of concentrating the heat collection system, heat storage system, and steam generation system. The technical economy of the photothermal conversion technology and the steam injection boiler are comprehensively compared and selected. The results showed that binary mixed nitrate could be used as an energy storage material for photothermal conversion for heavy oil thermal recovery. Besides, It has been found that circulating convection regulating valve is the preferred type of important parts of heat collection system. Also, optimizing VS1 molten salt pump can meet the operation requirements of hot and cold molten salt. On the other hand, a double-walled jacketed molten salt storage tank could be the mainstream design in the future. The thermal insulation design of a high-temperature foundation should ensure that the temperature of base concrete does not exceed 70 ℃. Finally, the combined heat transfer of preheater, steam generator, and superheater can meet the steam index of heavy oil thermal recovery, and strengthening the material selection of each unit is the key to ensure the safe operation of the whole system.

Key words: solar energy, photothermal technology, thermal storage, heavy oil thermal recovery

CLC Number:

TE 345

Mingjun DU, Jiaqiang JING, Zhigui ZHANG, Jinshuai LI, Ran YIN. Study on key technologies of solar energy photothermal conversion for heavy oil thermal recovery[J]. Energy Storage Science and Technology, 2020, 9(S1): 62-69.

Figures/Tables 5

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Table 1

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Table 2

Table 3

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指标	硝酸盐类	碳酸盐类	氯盐类	氟盐类	改性混合盐
液体温度范围/℃	240～580	400～800	400～1000	800～1200	200～900
物理性质	稳定性好	稳定性好	稳定性好	稳定性好	稳定性好
使用温区的化学性质	稳定性好	稳定性差	稳定性好	稳定性好	稳定性好
工质腐蚀性	小	中	强	强	依据种类不同
工质成本	低	中	低	高	高

设备名称	管程	壳程	管程进/出温度	壳程进/出温度	设备结构
给水预热器	水	熔盐	220 ℃（水)/328 ℃（水)	336 ℃/290 ℃	U形管式
蒸汽发生器	熔盐	水/蒸汽	448 ℃/336 ℃	328 ℃（水)/328 ℃（饱和)	釜式/汽包
再热器	水	熔盐	328 ℃（饱和)/540 ℃（过热)	565 ℃/448 ℃	U形管式器

指标	燃油注汽锅炉	燃气注汽锅炉	燃煤注汽锅炉	太阳能光热技术
燃料种类	原油、渣油	天然气、伴生气	煤粉、水煤浆	无
系统安全性	中等	安全性差	中等	安全
环境污染	严重	中等	严重	无污染
热效率	82%	91%	82%	98%
吨蒸汽消耗燃料量	60 kg	70 m³	150 kg	无
一次性建设投资	中等	中等	中等	大

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