Energy-saving space estimation method for circulating cooling water energy-saving transformation

Abstract

The invention belongs to the field of circulating cooling water energy conservation, particularly relates to an energy-saving space estimation method for circulating cooling water energy-saving transformation, and aims to solve the problems that an existing centrifugal pump frequency conversion energy-saving transformation technology excessively depends on pump performance curve and pipeline resistance curve information and technologies and experiences of professionals and is not objective and accurate enough. According to the scheme, the method comprises the following steps that S1, historical circulating cooling water flow and pressure data are collected; S2, the frequency change is calculated through the flow ratio, and then the lift proportion, namely the static energy-saving rate, is calculated; and S3, under the limitation that the temperature difference after frequency conversion cannot exceed 80% of temperature difference data in the current month and the lift cannot be lower than 20% of pressure difference data in the current month, the temperature difference exceeding 80% of the temperature difference data in the current month is set as the set temperature difference, and meanwhile the lift is enabled to be higher than 20% of the pressure difference data. The method avoids high dependence on a pump performance curve and a pipeline resistance curve, and has universality and objectivity in actual engineering application.

Description

technical field [0001] The invention relates to the technical field of cooling circulating water energy saving, in particular to an energy-saving space estimation method for cooling circulating water energy-saving transformation. Background technique [0002] In the cooling circulating water system, the circulating water pump is the main power consumption equipment. One energy-saving method for this kind of equipment at this stage is to use frequency conversion technology. In most applications, the flow of liquid delivered by a centrifugal pump is not constant, but varies dynamically with the demand at the water end. For a centrifugal pump operating at a constant speed and power frequency, it is necessary to adjust the opening of the valve at the outlet end of the centrifugal pump to change the resistance of the pipeline to regulate the flow. However, this method causes additional waste of energy due to valve resistance on the one hand. On the other hand, it makes the cent...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the disadvantages of centrifugal pump frequency conversion energy-saving transformation technology in the prior art that rely too much on the pump performance curve and pipeline resistance curve information, as well as the technology and experience of professional technicians, and are not objective and accurate enough. Estimation method of energy-saving space for energy-saving retrofit of cooling circulating water

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