Study On Rebuilding The Dynamic And Simulative Test Bed Of Circulating Cooling Water And Testing The Scale Inhibition Of Condenser

This article mainly aims at improving the existing simulative test bed of thermal power plant circulating cooling water system in laboratory to solve the problems for the original test bed. Meanwhile, provide theoretical foundation for the practical operation of the circulating cooling water system in a thermal power plant from Inner Mongolia after using the reconstructed test bed to do the test on the scale and corrosion inhibitation capability of the pipes and water quality in the system.After analyzing the problems of the original test bed, we substitute the original heating approach that constant temperature water bath with saturated steam heating approach in the simulating heat exchange system. In the design of simulating heat exchanger, using O-shaped seal ring inside and PTFE seal head could solve the problem of steam sealing. Through improved test bed to resolve the shortcomings of the original test bed, test more accurate measurement, test tube replacement more convenient. After transformation, the process of test stand work mainly by test the water cycle;steam cycle; cooling cycle to achieve the three cycle. Test on the capability of the test bed shows that after improving the entering water and leaving water temperature which has been greatly improved than the original test bed could be stably controlled at 30℃~ 40℃and close to the practical operation. The test shows that the improved test bed could meet the requirements of the cooling water dynamic simulating test.This paper also uses the improved test bed to do the test on the scale and corrosion inhabitation capability of the pipes and water quality in the circulating cooling water system in a thermal power plant from Inner Mongolia. The thermal power plant takes the water in Yellow River as replenishing water for the circulating cooling water and copper pipes as the condenser tubes. However, the quality of such kind of water is easy to scale and corrosive, in particular, Chlorine resistance of condenser tube HSn70-1B is poor and prone to pitting corrosion. Dynamic simulation test results show that: the concentration ratio for the power plant cooling water system operation should be controlled below 2.30, and during the process of operation the capability of corrosive inhibition for the recommended scale inhibitor should be increased, that is increasing the quantity of azole in the scale inhibitor to prevent the occurrence of pitting corrosion of the condenser copper tube. Through tests on the scale and corrosion inhibition of the circulating cooling water system in the thermal power plant, further validate that the improved test bed could meet the dynamic simulation test, and the test bed performance has been greatly improved than the original. The circulating cooling water dynamic simulation test results could direct the practical operation for the circulating cooling water system in the power plant.