Shell and tube type heat exchanger and control method thereof

Abstract

The invention discloses a shell and tube type heat exchanger and a control method thereof. The shell and tube heat exchanger comprises a shell, a pipe box, a pipe plate and a heat exchange pipe, wherein the shell is provided with an inner cavity, the shell is provided with a shell pass inlet, a shell pass first outlet and a shell pass second outlet; the shell pass inlet and the shell pass first outlet are located at the two ends of the shell correspondingly, the pipe box is at least arranged at one end of the shell, the pipe box is provided with an inner cavity, a pipe pass inlet and a pipe pass outlet are formed in the pipe box, the pipe plate is located between the shell and the pipe box, the heat exchange pipe is arranged in the inner cavity of the shell, the heat exchange pipe penetrates through the pipe plate to communicate with the inner cavity of the pipe box, and the ratio of the shell pass length between the shell pass second outlet and the shell pass inlet accounts for the shell pass length between the shell pass first outlet and the shell pass inlet is 1 / 5-1 / 3. According to the scheme, the problems that when the pipe shell and tube heat exchanger is operated under the variable working condition, a cooling medium adjusting valve cannot be in the interval with excellent adjusting characteristics and accurate control of the outlet temperature of a cooled medium is difficult to be realized according to the working conditions are solved.

Description

technical field [0001] The invention relates to the technical field of heat exchange, in particular to a shell-and-tube heat exchanger and a control method thereof. Background technique [0002] Shell-and-tube heat exchangers are widely used in the fields of chemical industry, petroleum, refrigeration, nuclear energy and power. The effect of heat exchange and cooling. Shell-and-tube heat exchanger, also known as shell-and-tube heat exchanger, is a side-wall heat exchanger with the wall of the tube bundle enclosed in the shell as the heat transfer surface. It has a simple structure, low cost, and a wide flow cross-section. , Easy to clean scale and other advantages. [0003] The heat transfer performance of the shell-and-tube heat exchanger is determined by the tube side and the shell side, and the tube side and the shell side have been determined during the processing and production of the shell-and-tube heat exchanger, and they are all fixed values. When purchasing shell...

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Problems solved by technology

[0004] The invention discloses a shell-and-tube heat exchanger and its control method to solve the problem that when the current shell-and-tube heat exchanger operates under variable working conditions, the cooling medium regulating valve cannot be located in the interval with excellent regulating characteristics, and it is difficult to realize the division of working conditions. Aiming at the problem of precise control of the outlet temperature of the cooled medium

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