Optimization method of industrial circulating water energy-saving system and industrial circulating water energy-saving system using it

Abstract

The invention relates to an optimization method of an industrial circulating water energy-saving system. After statistically analyzing the circulating water pump, the cooling tower and the heat exchanger of the process equipment in the circulating water system, the entire circulating water is divided according to the height position of the heat exchanger of each process The heat exchanger of the system is divided into the high heat exchanger part located in the high position area and the low area heat exchanger part located in the low position area, and the model is built through the fluid simulation calculation software, and the circulating water flow balance and the system head calculation simulation are carried out Analysis, and then combined with the operating costs and construction investment costs for economic benefit evaluation, a reasonable selection of the optimal economic benefits of the high zone heat exchanger part and the low zone heat exchanger part of the partition line. It overcomes the shortcomings of the existing local energy-saving renovation technology that does not fully tap the potential of energy-saving space, and aims at maximizing the overall energy saving of the circulating water system, and solves the problem that local renovation can only treat the symptoms but not the root cause. The invention relates to an industrial circulating water system applying the above optimization method.

Description

technical field [0001] The invention relates to the technical field of industrial circulating water energy-saving systems, in particular to an optimization method for an industrial circulating water energy-saving system and an industrial circulating water energy-saving system using the method. Background technique [0002] The circulating water system is an important public project in the coal chemical industry. Its operation requires a large amount of water and electricity. The circulating cooling water consumption of large coal chemical plants accounts for more than 60% of the water intake, and the power consumption of its system operation accounts for about 100% of the electricity consumption of enterprises. 8%-10% of the total amount. Taking the second circulating water plant of Wuhan Ethylene as an example, the design scale is 45000m 3 / h, the water supply pressure is 0.42Mpa, and the annual power consumption is as high as 69.7433 million kW·h. As far as the domestic ...

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Problems solved by technology

[0015] The semi-integral energy-saving optimization technology of circulating water still stays in the energy-saving transformation on the original basis of the system, and the overall layout of the system has not been changed. Maximize the angle of consideration, but continue to use the existing heat exchanger space layout of the process unit for limited energy-saving design

After the pipeline pump is used for partial pressurization, in order to ensure the pressure balance of the return water pipeline, valves need to be set to control the flow and pressure, which will cause energy waste; when there are many high-level heat exchangers, more pipeline pumps need to be added, which will affect the circulation. The overall hydraulic balance of the water pipe network makes it difficult to control the water volume of the system. At the same time, more pipeline pumps also bring management problems to the owner

[0016] To sum up, neither the local energy-saving optimization technology for circulating water nor the semi-integral energy-saving optimization technology for circulating water has not changed the essence of the circulating water system. Pre-design margin is the main focus, tending to save energy at a single point, lacking consideration for overall system energy conservation, and its energy-saving potential is limited

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