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王立舒,李欣然,苏继恒,张旭,孙士达.基于温差电池的温室地埋供热金属管道阴极保护改进[J].农业工程学报,2018,34(19):195-201.DOI:10.11975/j.issn.1002-6819.2018.19.025
基于温差电池的温室地埋供热金属管道阴极保护改进
投稿时间:2018-03-26  修订日期:2018-08-12
中文关键词:  温度  发电  温差  能量转换  阴极保护
基金项目:黑龙江省教育厅科技课题(12521038)
作者单位
王立舒 东北农业大学电气与信息学院哈尔滨 150030 
李欣然 东北农业大学电气与信息学院哈尔滨 150030 
苏继恒 东北农业大学电气与信息学院哈尔滨 150030 
张旭 东北农业大学电气与信息学院哈尔滨 150030 
孙士达 东北农业大学电气与信息学院哈尔滨 150030 
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中文摘要:北方温室为种植反季节植物以及南方植物,普遍采用地埋供热金属管道供热。阴极保护技术可以有效控制土壤对管道的电化学腐蚀,但常规的外接电流阴极保护方式成本高、占地大,牺牲阳极方式的保护寿命过短。为了给温室地埋供热金属管道提供可靠的阴极保护,该文利用地埋供热金属管道表面余热,基于温差电池,对地埋供热金属管道提供外接电流方式的阴极保护。通过现场试验发现,该装置温差电池正常工作时冷热两端温差为33.2 ℃,当该装置提供的保护电位为–1 100 mV时,管道保护度达到了92.79%。该研究为温室地埋供热金属管道的保护提供了一种较为可行的方案,同时也对外接电流方式的短距离管道保护技术进行了初步探索。
Wang Lishu,Li Xinran,Su Jiheng,Zhang Xu,Sun Shida.Improvement of cathodic protection of greenhouse buried heat-supply metal pipeline based on thermoelectric cell[J].Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE),2018,34(19):195-201.DOI:10.11975/j.issn.1002-6819.2018.19.025
Improvement of cathodic protection of greenhouse buried heat-supply metal pipeline based on thermoelectric cell
Author NameAffiliation
Wang Lishu Institute of Electrical and Information, Northeast Agricultural University, Harbin 150030, China 
Li Xinran Institute of Electrical and Information, Northeast Agricultural University, Harbin 150030, China 
Su Jiheng Institute of Electrical and Information, Northeast Agricultural University, Harbin 150030, China 
Zhang Xu Institute of Electrical and Information, Northeast Agricultural University, Harbin 150030, China 
Sun Shida Institute of Electrical and Information, Northeast Agricultural University, Harbin 150030, China 
Key words:temperature  power  temperature difference  energy conversion  cathodic protection
Abstract: With the development of the global economy and the improvement of people’s living standards, the demand for traditional energy is increasing, which has led to serious energy shortage, and increasingly serious environmental pollution. More and more attention has been paid to thermoelectric power generation technology which takes the industrial and automobile waste heat as heat source. In order to plant out-of-season plants and southern plants, the northern greenhouses generally use heating pipeline for heating. Cathodic protection, as the main protective measure for buried pipelines, plays an important role in pipeline protection. In order to alleviate the corrosion rate of heating pipelines, the method of joint use of external anti-corrosion insulation layer and cathodic protection is generally adopted during the deployment of metal pipelines. This is also the most economical and reasonable anti-corrosion measure. Cathodic protection protects the metal from being corroded by the environmental media (such as soil), protect pipeline or equipment by corrosion with auxiliary anode or sacrificial anode materials, thereby achieving the purpose of prolonging the service life of the protected pipeline and improving its safety and economy. However, the cost for conventional external-current cathodic protection method is high with large footprint, and the protection life of the sacrificial anode method is too short. Therefore, in order to provide reliable external-current cathodic protection for greenhouse heating pipelines, this article uses the waste heat from the surface of the underground heating pipelines, through direct conversion of thermal energy into electrical energy by a thermoelectric power plant, to provide the cathodic protection of the external current mode for the buried heating pipeline. The technology has the advantages of green, environmental protection, simple structure, safety and reliability. This article focuses on the research of thermoelectric power generation systems, introduces the basic theory of thermoelectric power generation and derives the relationship of characteristic parameters of the thermoelectric cell. Based on the output characteristics of the thermoelectric cell, this article designs a self-powered system based on BQ25504 chip. The system collects the thermoelectric energy and continuously supplies it in the maximum power point tracking mode during operation. The thermoelectric conversion energy is collected by the BQ25504 chip produced by TI, and then supplied by the step-down regulator chip LM317 to cathodically protect the buried heating pipeline. The design uses the temperature of the pipeline as a heat source, and it has the advantages of almost no land occupation, long-term use, flexible protection and energy saving. Through field tests, the temperature difference between the cold and the hot ends of the device was found to be 33.2 ℃, which proved that the greenhouse heating pipeline was a heat source worthy of utilization. Finally, through the natural corrosion test, it was found that when the horizontal distance of the anode bed was 1.69 m and the protective potential provided by the device was –1 100 mV, the degree of protection to the pipeline could reach 92.79%. This study provides a more feasible solution for the protection of greenhouse heating pipelines, and at the same time, the short-distance pipeline protection technology of external current mode is also explored.
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