Method for controlling three-valve heat exchanger through flow speed difference

Abstract

The invention provides a method for controlling a three-valve heat exchanger through the flow speed difference. A first valve, a second valve and a third valve are arranged at inlets of a first heat exchange pipe, a second heat exchange pipe and a third heat exchange pipe correspondingly. A speed induction element is arranged in the free end of a pipe bundle and is used for detecting the flow speed of fluid in the free end of the pipe bundle. A flow speed sensor is in data connection with a controller. The controller extracts flow speed data according to the time sequence. Due to comparison offlow speed data of adjacent time sections, the flow speed difference or the accumulation of the flow speed difference changes of the heat exchanger is obtained, when the flow speed difference or theaccumulation of the flow speed difference changes is smaller than the threshold value, the first valve, the second valve and the third valve are controlled by the controller to be opened and closed,and whether first fluid, third fluid and second fluid conduct heat exchange or not is controlled. By means of the method, due to the fact that the speed difference or the accumulated flow speed difference changes are detected, new fluid is started to conduct alternate heat exchange, and therefore the elastic pipe bundle can be constantly driven to vibrate, and the heat exchange efficiency and thedescaling operation can be further achieved.

Description

technical field [0001] The present invention is a further improvement of the previous application, which is applied to the field of heat exchangers. The invention relates to a shell-and-tube heat exchanger, in particular to a shell-and-tube heat exchanger for gas heat exchange. Background technique [0002] The invention relates to descaling of heat exchangers, which is a new invention of shell-and-tube heat exchangers based on the research and development of Qingdao University of Science and Technology (application number 2019101874848). [0003] Shell-and-tube heat exchangers are widely used in chemical, petroleum, refrigeration, nuclear energy and power industries. Due to the worldwide energy crisis, in order to reduce energy consumption, the demand for heat exchangers in industrial production is also increasing. The quality requirements for heat exchangers are also getting higher and higher. In recent decades, although compact heat exchangers (plate, plate-fin, press-w...

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Problems solved by technology

[0009] In the previous application, a shell-and-tube heat exchanger with heat exchange of four fluids has been developed, but the above-mentioned shell-and-tube heat exchanger is controlled according to the cycle, resulting in poor vibration heat exchange effect and partial intelligence. Low

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