Freshwater resources in China are relatively scarce, and the surface and underground freshwater resources in Bayannaoer City, Inner Mongolia Autonomous Region are even scarce. This requires chemical enterprises and other production enterprises here to make full use of industrial water resources, reduce sewage discharge and even achieve zero discharge, and alleviate the pressure of water resources and environment restoration. It is understood that the proportion of industrial circulating cooling water in industrial water is as high as 80%. Therefore, it is necessary to treat industrial circulating cooling water scientifically and reasonably and reduce water consumption in order to achieve the purpose of efficient recycling and water saving.
Shenhua Bayannaoer Energy Co., Ltd. has about 2000 cubic meters of circulating water and 5000 cubic meters per hour of circulating water. In order to solve the problems of scaling, corrosion and bacteria and algae breeding in circulating water, the company spends about 300,000 yuan per year on medicaments. Previously, groundwater and condensate were used as recharge water in the circulating water system, and reclaimed water and condensate were used as recharge water after the reclaimed water transformation in the park was completed. Faced with increasingly stringent environmental requirements, the company has put forward higher requirements for the treatment of circulating water.
The application of electrochemical circulating water treatment technology can not only reduce the dosage of chemicals, reduce chemical pollution and improve the quality of circulating cooling water, but also solve the problems of scaling, bacteria and algae breeding and corrosion in circulating water. By increasing the concentration multiple of circulating water, reducing the discharge and replenishment of circulating water system, water saving effect can be achieved.
The indicators of the reformed circulating water have been improved in an all-round way.
It is understood that Shenhua Bayannaoer Energy Co., Ltd. is facing multiple pressures before adopting electrochemical circulating water treatment technology: long-term investment, which requires a lot of manpower and material resources every year; medicines contain many kinds of harmful substances, which pollute circulating cooling water; curing symptoms without curing the root causes can not fundamentally solve the problem; it is difficult to adapt to the increasingly severe environmental protection situation; and circulating cooling water system operators. In poor condition, the heat transfer efficiency is low, the operation concentration ratio is low, and the amount of supplementary water and sewage is large.
In order to solve the above problems, the company adopts electrochemical circulating water treatment device and adopts bypass water intake installation to treat circulating water.Specifically, in terms of technology, the process of purifying chemical reagents treatment is changed to a combination of electrochemical circulating water treatment technology and chemical reagent water treatment technology. In scale inhibition, electrochemical recirculating water treatment technology is used to reduce the concentration of scaling ions in the recirculating cooling water system. Combined with the dispersing mechanism of corrosion and scale inhibitors, it is difficult to deposit scales on the inner wall of the pipeline. In terms of bactericidal methods, electrochemical circulating water treatment technology was used to produce a variety of strong oxidizing substances. Combining oxidizing bactericide and algaecide and non-oxidizing bactericide and algaecide, the organisms in the circulating cooling water system of the enterprise were effectively treated.
After transformation, the indexes of circulating water in Shenhua Bayannaoer Energy Co., Ltd. have been improved comprehensively at present: calcium hardness has been reduced from 537 mg/l to 337 mg/l; chloride ion concentration has been reduced below 300 mg/l; concentration ratio has been raised from 2.0 to 4.0; corrosion and scale inhibitor dosage has been reduced by more than 50%; water saving rate of supplementary water has reached more than 30%; sewage water saving rate has reached 50%. More than%.Since its delivery on June 27, 2018, the device has been in normal operation for 11 months, safe, efficient and stable automatic operation, which improves the above water quality indicators, not only reduces costs for enterprises, but also makes a significant contribution to energy saving and emission reduction for enterprises.
According to the total annual operation time of the enterprise is 8000 hours/year, about 333 days. The relevant calculation shows that the water supply amount is 1100 cubic meters/day before the transformation, 770 cubic meters/day after the transformation, the saving rate is 30%, the annual water saving amount is 109890 cubic meters/year; the discharge amount is 620 cubic meters/day before the transformation, 310 cubic meters/day after the transformation, the saving rate is 50%, and the annual water saving amount is 102300 cubic meters/day.
The electrochemical circulating water treatment technology has a wide range of applications.
What mysterious secret lies in the electrochemical circulating water treatment technology which can improve the water quality index of Shenhua Bayannaoer Energy Co., Ltd. It is known that the electrochemical circulating water treatment technology is that after the treated water is put into the electrochemical circulating water equipment, electrochemical reactions occur near the cathode area, which produces a large amount of OH-, and forms a strong alkaline ring in the area. In the environment, a small amount of CO2 dissolved in water is combined with OH-to produce CO32-. The scalable ions react with OH-and CO32-to pre-scale and adhere to the wall of the reaction chamber. The self-cleaning system provided by the equipment can regularly scrape the scales from the inner wall of the equipment.
The electrochemical circulating water treatment equipment uses the electrochemical principle to pre-precipitate scaling ions in the form of scales, thus preventing scales from forming in the circulating water system. At the same time, the strong oxides produced have the effect of killing bacteria and algae and retarding corrosion. It solves three major problems of scaling, bacteria and algae breeding and corrosion in industrial circulating water at one time, and has good use effect. During the operation of electrochemical circulating water treatment equipment, scaling ions in circulating water can be continuously removed, the hardness of circulating water can be reduced, the concentration multiple of circulating water system can be increased, the amount of sewage discharge and supplementary water can be reduced.
According to estimates, this technology can save 120450 cubic meters of water supply and 113150 cubic meters of drainage per year. The total annual cost savings are 1.385 million yuan.This technology is suitable for petrochemical industry, coal chemical industry, electric power, chlor-alkali, pulp and paper making, electronics and Steel coking industries with circulating cooling water system, especially in areas where water quality is poor and water resources are scarce.
Solving Circulating Water Problem by Energy Conservation and Environmental Protection
With the problem of environmental pollution and energy shortage becoming more and more serious, the national standards for pollutant discharge and requirements for cleaner production have gradually increased. Implementing the concept of green development and carrying out pollution control and ecological environmental protection are important tasks for central enterprises to implement the national key development strategy. In order to protect the environment, reduce pollution and achieve the goal of water saving and emission reduction, more and more enterprises will adopt electrochemical circulating water treatment technology to treat industrial circulating cooling water, which conforms to the national policy guidance.The technology has the advantages of high efficiency, easy operation, high automation, friendly environment and energy saving and environmental protection. It can realize the functions of high efficiency descaling, bactericidal and algae killing, self-cleaning, on-line monitoring and water saving and energy saving. It has advanced technology and broad application prospects.
The practical application of this technology in Shenhua Bayannaoer Energy Co., Ltd. proves that this technology can solve the problem of circulating water in a way of energy saving and environmental protection. While achieving the performance of scale inhibition, bactericidal, algae elimination and corrosion inhibition, it also has the characteristics of scale removal, scale dissolution, reduction of salt ion concentration, enhancement of concentration multiple, water saving and energy saving, and pollution-free. It has strong technical advantages and application prospects