农业工程学报2017，Vol.33Issue(9)：218-223,6.DOI:10.11975/j.issn.1002-6819.2017.09.028
海水源热泵对海参育苗废水热能回收的工程应用
Engineeringapplication ofseawater-sourceheat pump forwaste heat recovery insea cucumber breedingsystem
摘要
Abstract
In order to cut down energy consumption, heat loss and air pollution for water heating in indoor aquaculture system, a seawater-source heat pump system, which comprised 2 heat exchangers (namely I-stage exchangers) and a seawater-source heat pump and employed waste water as heating source, was developed and applied in an aquatic organismindoor nursing system. The onsite flow rate of waste water and fresh seawater in I-stage exchangers were regulated to 400 m3/h, respectively. The flow rate of waste water in the seawater-source heat pump was 20 m3/h, while the flow rate of fresh seawaterincreased from 10 to 20 m3/h during the onsite operation. The effectiveness for fresh seawater heating and the heat recovery of waste water by the seawater-source heat pump system were studied on site, and the amounts of energy consumption and carbon emission during the heating period were correspondingly calculated and compared with conditional coal-fired boiler heating approach. It showed that the heat-exchanging efficiency of I-stage heat exchangers was in direct proportion to the temperature differenceof inflowing waste water and fresh seawater. When the inlet temperatures of waste water and fresh seawater were 10.3 and-1.9℃, respectively, the 5.8℃increment of temperature in fresh seawater and 6.1℃drop of temperature in waste water were observed.Additionally, with 14.9℃inflowing waste water and 4.9℃fresh seawater, the outlet temperature of fresh seawater increased to 9.5℃, while the waste water dropped to 10.0℃. The maximum heat recovery efficiency by I-stage exchangers from waste water was59.5%. On the other hand, when the temperature and flow rate of inflowing waste water were not changed, the temperature increment of fresh seawater from the seawater-source heat pump was inversely proportional to its inflowing rate and temperature. With waste water of 14.9℃as the heat source of the seawater-source heat pump, the temperature of fresh seawater increased from 7.3 to 18.6℃at 10 m3/h and to 13.2℃at 20m3/h, which brought out temperature increment of 5.9-11.3℃. In the same case, the temperature of fresh seawater out of the seawater-source heat pump increased from 10.3 to 20.1℃at 10 m3/h and to 16.6℃at 20 m3/h, with temperature increment of6.3-9.8℃. Accordingly, when the temperature of inflowing fresh seawater was 7.3 and 10.3℃, appropriate water temperature (15℃) could be obtained for aquatic organism indoor nursing by keeping the flow rate of fresh seawater at 15 and 20 m3/h, respectively. It was also found that the temperature drop of waste water in the seawater-source heat pump was about 6℃during the operation, which gained the heat recovery efficiency of 40.7% for waste water. The coefficient of performance (COP) of the seawater-source heat pump was 5.03-5.52. In comparison with traditional coal-fired boiler heating approach, the integrated seawater-source heat pump system demonstrated significant drop in energy consumption (over 37.6%) and carbon dioxide emission (about 2200 t/a). The payback period for the seawater-source heat pump system would be about 0.77 a. Therefore the seawater-source heat pump system has an obvious potential in energy conservation and carbon emission reduction in indoor aquaculture system.关键词
废水/加热/温度/海参/水体升温/海水源热泵/热能回收Key words
waste water/heating/temperature/sea cucumber/water heating/seawater-source heat pump/heat recovery分类
能源科技引用本文复制引用
李秀辰,邓伟,张殿光,母刚,张国琛,陈帅,车全..海水源热泵对海参育苗废水热能回收的工程应用[J].农业工程学报,2017,33(9):218-223,6.基金项目
辽宁省科学技术重点项目(2008228001) （2008228001）
大连市科技兴海专项资金项目(20140301) （20140301）
