Difference between revisions of "Solar application for general process heating"
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!colspan="6"|Most common heat supply technologies in Industry are hot water or steam boilers that supply heat at temperatures up to 250 °C. Based on the respective heat transfer medium (steam or hot water) and irradiation at the company site, different integration concepts for solar heat can be applied. | !colspan="6"|Most common heat supply technologies in Industry are hot water or steam boilers that supply heat at temperatures up to 250 °C. Based on the respective heat transfer medium (steam or hot water) and irradiation at the company site, different integration concepts for solar heat can be applied. | ||
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|'''SL_S_PD – direct solar steam generation''' | |'''SL_S_PD – direct solar steam generation''' | ||
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While solar steam is fed into the existing circuit the conventional steam boiler reduces its steam production similar to operation periods with reduced load. The actual loss of efficiency of the steam boiler caused by the solar heating system is influenced by the ratio of installed solar power to conventional capacity, the typical load, and steam boiler performance (scope of modulation). This integration concept was realized with in several demonstration plants. | While solar steam is fed into the existing circuit the conventional steam boiler reduces its steam production similar to operation periods with reduced load. The actual loss of efficiency of the steam boiler caused by the solar heating system is influenced by the ratio of installed solar power to conventional capacity, the typical load, and steam boiler performance (scope of modulation). This integration concept was realized with in several demonstration plants. | ||
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− | | | + | |[[File:SL_S_PI.jpg]] |
|'''SL_S_PI – indirect solar steam generation''' | |'''SL_S_PI – indirect solar steam generation''' | ||
Regarding the interaction of the solar heating system with the conventional steam supply system this integration concept is similar to the prior one (SL_S_PD). For this concept concentrating collectors with pressurized water or thermo oil as heat transfer medium are used to feed a special heat exchanger for evaporation (typically kettle type reboiler). The heat exchanger is operated at the same pressure as the conventional steam system. | Regarding the interaction of the solar heating system with the conventional steam supply system this integration concept is similar to the prior one (SL_S_PD). For this concept concentrating collectors with pressurized water or thermo oil as heat transfer medium are used to feed a special heat exchanger for evaporation (typically kettle type reboiler). The heat exchanger is operated at the same pressure as the conventional steam system. | ||
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− | | | + | |[[File:SL_S_FW.jpg]] |
|'''SL_S_FW –solar heating of boiler feed water''' | |'''SL_S_FW –solar heating of boiler feed water''' | ||
The serial integration of solar heat for heating of boiler feed water takes place after degasification. Usually the degasification is operated around 105 °C. The set temperature of boiler feed water depends on the supply pressure of the steam boiler and is usually in the range of 160..220 °C (equals 6 to 23 bar). Typically boiler feed water is (or should be) preheated by an economizer before entering the steam boiler (by approx. 30 K). The remaining temperature difference can be supplied by solar heat. Based on the dimensioning of economizers, a solar preheating of boiler feed water prior to the economizer is not always possible. | The serial integration of solar heat for heating of boiler feed water takes place after degasification. Usually the degasification is operated around 105 °C. The set temperature of boiler feed water depends on the supply pressure of the steam boiler and is usually in the range of 160..220 °C (equals 6 to 23 bar). Typically boiler feed water is (or should be) preheated by an economizer before entering the steam boiler (by approx. 30 K). The remaining temperature difference can be supplied by solar heat. Based on the dimensioning of economizers, a solar preheating of boiler feed water prior to the economizer is not always possible. | ||
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− | | | + | |[[File:SL_S_MW.jpg]] |
|'''SL_S_MW – solar heating of make-up water''' | |'''SL_S_MW – solar heating of make-up water''' | ||
Revision as of 12:39, 8 January 2015
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