An energy integration optimization method for industrial circulating cooling water

Abstract

The invention relates to the technical field of industrial circulating cooling water energy saving, in particular to an energy integrated optimization method for industrial circuiting cooling water. In detail, the optimization method includes the following steps that constraint conditions and an optimization variable are calculated to obtain a theoretical index requirement; the optimal water consumption is obtained through calculation on the theoretical index requirement; on-site measuring data and pipe network simulation data are added into the optimal water consumption to judge whether the optimal water consumption is reasonable or not, and theoretical water supply pressure is obtained through calculation; a key line, a sub-key line and a non-key line are obtained through calculation; calculation is performed in the key line, the sub-key line and the non-key line, and whether pressure loss potential exploiting exists or not is judged; the minimum water supply pressure is obtained through calculation; theoretical water supply pressure is compared with the minimum water supply pressure to determine whether the theoretical water supply pressure is reasonable or not, and water field equipment is adjusted. Compared with the prior art, operation conditions of a circulating water system can be monitored, problems which exist in the circulating water system are diagnosed, an optimization scheme is provided, it is guaranteed that power and water are saved under long-period safe operation of the circulating water system, and operation efficiency of the circulating water system is improved.

Description

technical field [0001] The invention relates to the technical field of energy saving of industrial cooling circulating water, in particular to an energy integration optimization method of industrial circulating cooling water. Background technique [0002] The industrial circulating cooling water system is a cooling water system that uses water as the cooling medium and circulates it. It is composed of a cooling tower, a circulating water pump, a circulating water pipe network, and heat exchange equipment. As an indispensable utility for industrial production, circulating cooling water is used in various fields such as petroleum, chemical industry, and steel. The power consumption of water pumps accounts for 20% of the total electricity consumption, and cooling water accounts for about 70% of industrial water consumption. [0003] As a production auxiliary system, the circulating water system has not paid attention to its energy consumption in the past as long as it can meet ...

AI Technical Summary

Problems solved by technology

[0004] 1. The water cooling load is too large, which cools some loads that should not be cooled. The water pressure requirements of the "remote" and "high level" cooling systems cause the water consumption of the low level and nearby cooling systems to be too large

[0005] 2. The system header pressure is too high

[0006] 3. The temperature of the return water on the circulating water is generally low, but the contradiction of local high is prominent; the circulating water pump does not match, the head has a surplus, the return water pressure is high, and the power consumption of the circulating water pump is increased

[0007] 4. The load distribution between the circulating water fields is not optimized, the cooling effect of the cooling water tower is poor, and the cooling efficiency of the cooling water tower decreases, which increases the power consumption of the fan

[0008] 5. Long-term operation of the water cooler, biological slime, poor circulating water quality and improper operation lead to fouling of the water cooler, which not only reduces the cooling effect, but also increases the resistance of the pipeline

For example, the circulating water pump is modified one-sidedly according to the circulating water volume, or the cooling tower fan is modified according to the circulating water return pressure, but the problem of high circulating water pressure is not fundamentally solved

[0012] 2. Comprehensive optimization has not been carried out in terms of water terminals, delivery pipelines, cooling water towers, circulating water pumps, etc., ignoring the water use link and circulating water delivery link, and the overall effect has not reached the optimum

For example: the temperature of the cooling medium at the water end is high, and the waste heat is not fully recovered, resulting in excessive water cooling load; the flow rate in the circulating water pipe is low, resulting in serious fouling and corrosion of the water cooler, resulting in a decline in cooling effect, and at the same time increasing pipeline resistance and pressure loss in the pipeline network Big

[0013] 3. Lack of monitoring and management platform

Although the circulating water plant has a DCS monitoring system, it lacks real-time monitoring and diagnosis of the water terminal (water cooler), and has not realized data-based and refined management

[0014] 4. Unreasonable management measures

If the water-saving measures are taken to meet the temperature difference index of the circulating water and the return water, it is easy to cause the flow rate of the water cooler to be too low, resulting in scaling and corrosion of the equipment

Images