| Circulating cooling water for the chemical fertilizer installment was provided by Lanzhou Petrochemical Corporation NO. 380 circulating cooling water system, and the pretreated Huanghe River water was used as the make-up water. According to the corrosion factor and scaling index, the make-up water was charged as easy-scaling water. There were many problems in this system, such as low concentratin multiple, high corrosion rate and slime content, microbia multiply and so on as the result of non-mature perfillmimg technology, incontinuously drugging and non-perfect operating rules in anagement. In view of these problems, it was studied how to optimize process controlling in case of high cycles of concentratin in this paper.In order to solve the above questions and reach the China petroleum recirculating water standards, the basic and anti-halogen water-treating technology was chosed to preventing ferric and metal equipments from being corroded. The major components were corrosion and scale inhibitor MS6209, which is constituted of phosphate, zinc, high–performance polymer and azole ketone corrosion inhibition, and scale inhibitor OP8492, which was composed of environment-friendly, easy-degrading epoxy-sulfo succinate polymer and HPS-I RSO3H. OP8492 has good antisludging and dispersive performance in treating high-hardness, high-alkalinity and high-cycles of concentratin water, and can stablize the zinc and orthophosphoric acid in condition of alkaline environment. In terms of preventing microorganism from multiplying, the syntheses with better cooperating performance and good sterilizing efffcect was choosed.Microorganism was prevented from multiplying by adding more active bromine, non-oxidizing biocide and sterilizing addition in impact way. In addition, automatic drug adding and online detecting was adopted in cleaning and perfilming in processing.The concentration range and the constitute rate of corrosion inhibitor MS6209 and scale inhibitor OP8492 was fixed in the captive test of corrosion inhibitoring and scale inhibiting. The results turned out that the corrosion-inhibiting effect is better when the concentration of MS6209 is about from 5 to 15 mg/L, and scale inhibiting effect when OP8492 from 40 to 60 mg/L. The most appropriate concentration of MS6209 and OP8492 is about from 10 and 50 mg/L respectively.The results came out that the corroding rate of steel and copper is 0.038 mm/a and 0.001 mm/a respectively, while the conglutinating rate is 3.56 mcm in dynamic stimulant experimentation.At the same time, the matching performance and anti- oxidating performance was studied in the corrosion-inhibiting experiment.It turned out to be that basic anti-halogen technology took good effect in water treating in practice, which is also fit in circulating water as the cyclw of concentratin is ranging from 5 to 7. The corroding rate of steel and copper was respectively 0.0249mm/a and 0.0026mm/a, while the average conglutinating rate was 4.3cmc. water quality could be well controlled in case of ammonia leaking. Using automatic drug-adding device and on-line inspecting thechnology, drug was added in time and steady,reducing drug and human force. At the same time, the effect of cleaning and perfilming inprocessing met the standards. After optimizaing on process and technology in NO.380 circulating cooling water system, the make-up water was saved 1,150,000 ton, while waste water was reduced 1,150,000 ton. the cost of drug is below 0.009 yuan in treating each ton circulating water. The cost about 8,747,000 yuan was saved in two years, the purpose of saving water and reducing waste water was achieved. It is ensured for the equipment running safely, stably, long-time, fill-loading and optimizingly. |
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