Method for determining optimal combination operation scheme of circulating cooling water system water pump units and adjusting valves of petrochemical enterprise

Abstract

The invention provides a method for determining an optimal combination operation scheme of circulating cooling water system water pump units and adjusting valves of a petrochemical enterprise. According to the method, maximum critical flow points of different combinations of the system water pump units during operation and required water power resistance coefficients of the water return pipe adjusting valves are determined; according to the minimum demand flow of a system at different water inlet temperatures, a system flow range corresponding to the various operation combinations, with the smallest the energy consumption, of the water pump units is determined, and the operation combinations of the circulating cooling water system water pump units can be optimized; for the determined optimal operation combination, corresponding to a certain minimum demand flow range of the system, of the water pump units, the minimum demand flow of the system is in the flow range but generally smaller than the maximum of the flow range, then by reducing the opening degrees of the adjusting valves, the operation flow of the system is reduced to be equal to the minimum demand flow of the system, the resistance coefficients of the adjusting valves and added values of the coefficients are determined, power of a water pump shaft is further reduced, and therefore the optimal operation combination of the circulating cooling water system water pump units and the adjusting valves can be achieved.

Description

technical field [0001] The invention relates to an algorithm for determining the optimal operation of a circulating cooling water system of a petrochemical enterprise to reduce energy consumption, in particular to a method for determining an optimal combined operation scheme of a water pump unit and a regulating valve of a circulating cooling water system of a petrochemical enterprise. Background technique [0002] The power consumption of the circulating cooling water system accounts for nearly 8% of the power generation of the national economy and nearly 11% of the power consumption of the industrial economy. The power consumption of the circulating cooling water system of petrochemical enterprises accounts for a large proportion of the entire industrial circulating cooling water system . [0003] The research on the operating conditions, efficiency and energy consumption of the circulating cooling water system involves many disciplines such as fluid mechanics, heat transf...

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Problems solved by technology

[0005] The purpose of the present invention is to propose an optimal combination of water pump units and regulating valves in the circulating cooling water system of petrochemical enterprises in view of the serious energy waste problems such as non-optimization, qualitative optimization and unreasonable optimization in the operation of the circulating cooling water system of petrochemical enterprises Operation plan and its precise quantitative determination method

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