供热管道减阻涂层减阻效果的实验研究
Experimental research on drag-reducing effect of drag-reducing coating in heating pipeline
摘要：
对DN150管径的钢管内壁增加减阻涂层后，在流量为65 t/h，水温为20、25、30、35、40 ℃ 5种工况下进行了压降测试，得到87 m长有涂层管段的压降平均值为4.63 kPa，无涂层管段的压降平均值为9.63 kPa。根据实测压降推算得到，有涂层管段的当量绝对粗糙度约为0.01 mm，为CJJ 34—2010《城镇供热管网设计规范》规定的当量绝对粗糙度0.5 mm的1/50。和当量绝对粗糙度0.5 mm时的理论计算值相比，实验工况减阻涂层的减阻率达到42.22%。以DN1200大管径长输供热管道为例，在流量10 000~16 000 m3/h，水温20、40 ℃工况下，计算得到有涂层管段的减阻率为32%~37%。
Abstract：
After adding drag-reducing coating to the inner wall of the steel pipe with DN150 pipe diameter, conducts the pressure drop test under five working conditions with flow rate of 65 t/h and water temperature of 20, 25, 30, 35, 40 ℃, obtains that the mean pressure drop on the 87 m pipe with inner drag-reducing coating is 4.63 kPa, and the mean pressure drop on the 87 m pipe without inner drag-reducing coating is 9.63 kPa. Based on the actual pressure drop calculation, the equivalent absolute roughness of the coated pipe section is about 0.01 mm, which is 1/50 of the equivalent absolute roughness of 0.5 mm specified in CJJ 34-2010 Code for design of urban heating pipe networks. Compared with the theoretical calculation value when the equivalent absolute roughness is 0.5 mm, the drag-reducing rate of the drag-reducing coating under the experimental conditions reaches 42.22%. Taking the long-distance heat supply pipeline with a large diameter of DN1200 as an example, when the flow rate is 10 000 to 16 000 m3/h and the water temperature is 20, 40 ℃, the drag-reducing rate of the coated pipe section is calculated to be 32% to 37%.
Keywords:heatingpipeline,drag-reducingcoating,equivalentabsoluteroughness,drag-reducingrate,experimentalresearch