地下水源热泵水井泵砂与堵塞原因分析
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摘要
地下水源热泵系统常会出现抽水井泵砂、抽水井和回灌井堵塞等问题,影响系统的正常运行或系统效率。以湖北省荆州市某地下水源热泵工程为例,分析了江汉平原广泛分布的卵砾石夹细砂含水层中成孔方法选择、滤料及过滤管设计中存在的问题;指出了目前在过滤管外包不锈钢丝网是防止在细砂层中水井泵砂的有效手段之一,但宜与泥浆密度轻、对地层污染小的反循环成孔工艺配合使用,且仍要根据含水层的颗粒级配曲线选择滤料,发挥滤料的过滤作用,避免过滤压力转移到包网过滤管,以减少抽水井堵塞。
Sand entry and well clogging in the groundwater heat pump system often affect the operation and efficiency of the system. Taking a project in Jingzhou City as an example, analysis is made of selection of the water well drilling method in gravel with fine sand aquifer occurring widely in Jianghan Plain and the problems with pack material and the screen design. It is pointed out that one of the effective means to prevent sand entry from the fine sand layer is to wrap the stainless steel wire mesh around the screen pipe at present; anyhow it's better to be used in conjunction with the reverse circulation drilling method, and the pack material should be selected according to the gradation curve of the aquifer to avoid the transfer of the filtration pressure to the screen pipe, thus reducing well clogging.
Sand entry and well clogging in the groundwater heat pump system often affect the operation and efficiency of the system. Taking a project in Jingzhou City as an example, analysis is made of selection of the water well drilling method in gravel with fine sand aquifer occurring widely in Jianghan Plain and the problems with pack material and the screen design. It is pointed out that one of the effective means to prevent sand entry from the fine sand layer is to wrap the stainless steel wire mesh around the screen pipe at present; anyhow it's better to be used in conjunction with the reverse circulation drilling method, and the pack material should be selected according to the gradation curve of the aquifer to avoid the transfer of the filtration pressure to the screen pipe, thus reducing well clogging.
引文
[1] 陆肖,嵇启春.地下水源热泵优势及问题探讨[J].建筑节能,2010,38(9):34-37. LU Xiao, JI Qichun. Advantages and disadvantages of the ground water heat pump[J]. Construction Conserves Energy, 2010, 38(9):34-37.
[2] 胡海军,李春晖.浅议水源热泵系统中的地下水回灌[J].地下水,2010,32(2):49-50. HU Haijun, LI Chunhui. Discussion on the groundwater recharge of water source heat pump[J]. Ground Water, 2010,32(2):49-50.
[3] Steve Kavanaugh, Kevin Rafferty. Geothermal heating and cooling design of ground-source heat pump systems[M]. ASHRAE, USA, 2014.
[4] 姚文清,王文喜,杨颖.地下水源热泵系统的水文地质勘察[J].西部探矿工程,2010,22(10):152-154,157. YAO Wenqin, WANG Wenxi, YANG Ying. Hydrogeological investigation of groundwater source heat pump system[J]. West-China Exlplration Engineering, 2010,22(10):152-154,157.
[5] 罗新梅,蒋丹凤.地下水源热泵成井设计与施工的工程应用研究[J].建筑热能通风空调,2010,29(3):84-87. LUO Xinmei, JIANG Danfeng. Research and analysis of groundwater heat pumps well construction[J]. Building Energy & Environment, 2010,29(3):84-87.
[6] Banks, D. An introduction to thermogeology: ground source heating and cooling(second edition)[M]. A John Wiley & Sons, Ltd., Publication, UK, 2012.
[7] Misstear B., Banks D., Clark L. Water wells and boreholes (second edtion)[M]. John Wiley & Sons, Ltd., UK, 2017.
[8] 王秉忱.我国浅层地热能开发现状与发展趋势(三)[J].供热与制冷,2012,(2):56-57. WANG Bingchen. Current situation and development trend of shallow geothermal energy development in China(3)[J]. Heating and Refrigeration, 2012,(2):56-57.
[9] 王献坤,赵云章,刘海风,等.郑汴新区中细砂含水层水源热泵井回灌新技术[J].水文地质工程地质,2013,40(3):136-140. WANG Xiankun, ZHAO Yunzhang, LIU Haifeng, et al. The new injection technique of the water heat pump system in the medium-fine sand aquifer in the Zhengbian New Region[J]. Hydrogeology & Engineering Geology, 2013,40(3):136-140.
[10] 李任年.常见地热井堵塞类型及处理方法[J].探矿工程(岩土钻掘工程),2015,42(10): 38-41. LI Rennian. Common geological well blockage and the processing methods[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2015,42(10):38-41.
[11] 邵盛元,温得全,胡菲菲,等.中国援助柬埔寨乡村供水项目水井施工工艺及解决问题的措施[J].探矿工程(岩土钻掘工程),2018,45(3):19-23. SHAO Shengyuan, WEN Dequan, HU Feifei, et al. Water well construction technology of China-aided Cambodia rural water supply project[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2018,45(3):19-23.
[12] GB 50296-2014,管井技术规范[S]. GB 50296-2014, Technical code for tube well[S].
[13] 张陵,胡祥胜,关义涛,等.江汉平原第四纪含水层系统特征[J].资源环境与工程,2016, 30(6): 895-898. ZHANG Ling, HU Xiangsheng, GUAN Yitao, et al. System characteristics of quaternary aquifer in Jianghan Plain[J]. Resources Environment & Engineering, 2016,30(6): 895-898.
[14] Houben G, Treskatis C. Water well rehabilitation and reconstruction[M]. McGraw Hill, New York, 2007.
[15] Driscoll F.G. Ground water and wells (second edition) [M]. Johnson Filtration Systems, St. Paul, Minnesota, 1986.
[16] Bakiewicz W, Milne D.M., Pattle A.D.. Development of public tube well designs in Pakistan[J]. Quarterly Journal of Engineering Geology, 1985,18:63-77.
[2] 胡海军,李春晖.浅议水源热泵系统中的地下水回灌[J].地下水,2010,32(2):49-50. HU Haijun, LI Chunhui. Discussion on the groundwater recharge of water source heat pump[J]. Ground Water, 2010,32(2):49-50.
[3] Steve Kavanaugh, Kevin Rafferty. Geothermal heating and cooling design of ground-source heat pump systems[M]. ASHRAE, USA, 2014.
[4] 姚文清,王文喜,杨颖.地下水源热泵系统的水文地质勘察[J].西部探矿工程,2010,22(10):152-154,157. YAO Wenqin, WANG Wenxi, YANG Ying. Hydrogeological investigation of groundwater source heat pump system[J]. West-China Exlplration Engineering, 2010,22(10):152-154,157.
[5] 罗新梅,蒋丹凤.地下水源热泵成井设计与施工的工程应用研究[J].建筑热能通风空调,2010,29(3):84-87. LUO Xinmei, JIANG Danfeng. Research and analysis of groundwater heat pumps well construction[J]. Building Energy & Environment, 2010,29(3):84-87.
[6] Banks, D. An introduction to thermogeology: ground source heating and cooling(second edition)[M]. A John Wiley & Sons, Ltd., Publication, UK, 2012.
[7] Misstear B., Banks D., Clark L. Water wells and boreholes (second edtion)[M]. John Wiley & Sons, Ltd., UK, 2017.
[8] 王秉忱.我国浅层地热能开发现状与发展趋势(三)[J].供热与制冷,2012,(2):56-57. WANG Bingchen. Current situation and development trend of shallow geothermal energy development in China(3)[J]. Heating and Refrigeration, 2012,(2):56-57.
[9] 王献坤,赵云章,刘海风,等.郑汴新区中细砂含水层水源热泵井回灌新技术[J].水文地质工程地质,2013,40(3):136-140. WANG Xiankun, ZHAO Yunzhang, LIU Haifeng, et al. The new injection technique of the water heat pump system in the medium-fine sand aquifer in the Zhengbian New Region[J]. Hydrogeology & Engineering Geology, 2013,40(3):136-140.
[10] 李任年.常见地热井堵塞类型及处理方法[J].探矿工程(岩土钻掘工程),2015,42(10): 38-41. LI Rennian. Common geological well blockage and the processing methods[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2015,42(10):38-41.
[11] 邵盛元,温得全,胡菲菲,等.中国援助柬埔寨乡村供水项目水井施工工艺及解决问题的措施[J].探矿工程(岩土钻掘工程),2018,45(3):19-23. SHAO Shengyuan, WEN Dequan, HU Feifei, et al. Water well construction technology of China-aided Cambodia rural water supply project[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2018,45(3):19-23.
[12] GB 50296-2014,管井技术规范[S]. GB 50296-2014, Technical code for tube well[S].
[13] 张陵,胡祥胜,关义涛,等.江汉平原第四纪含水层系统特征[J].资源环境与工程,2016, 30(6): 895-898. ZHANG Ling, HU Xiangsheng, GUAN Yitao, et al. System characteristics of quaternary aquifer in Jianghan Plain[J]. Resources Environment & Engineering, 2016,30(6): 895-898.
[14] Houben G, Treskatis C. Water well rehabilitation and reconstruction[M]. McGraw Hill, New York, 2007.
[15] Driscoll F.G. Ground water and wells (second edition) [M]. Johnson Filtration Systems, St. Paul, Minnesota, 1986.
[16] Bakiewicz W, Milne D.M., Pattle A.D.. Development of public tube well designs in Pakistan[J]. Quarterly Journal of Engineering Geology, 1985,18:63-77.