Method for altering circulation sectional area in pipe of single-pipe air cooler

Abstract

The method of changing the cross-sectional area of ​​the tube in the single-tube air cooler is to insert a pipe fitting from the end of the finned tube base pipe in the direction of fluid flow after the finned tube is manufactured. The shape of the pipe can be a cylinder, a cone or other shapes. Its length is determined according to the structure of the air cooler, steam flow, temperature and other factors, and is used to reduce the flow area and increase the flow rate of the liquid during the cooling stage. Both ends of the pipe fittings are sealed. The maximum cross-sectional diameter or the largest dimension on the cross-section of the pipe fittings is smaller than the inner diameter of the base pipe. There are fixed distance columns between the pipe fittings and the base pipe, which are used to fix the pipe fittings and maintain a certain distance between the pipe fittings and the base pipe. circulation area. For the heat exchange occasion where the medium in the tube of the single-tube air cooler is first condensed and then cooled, the present invention can increase the flow rate of the fluid cooling stage, improve the heat transfer coefficient, and enhance the heat transfer efficiency, thereby reducing the heat transfer area, saving materials, and reducing the size of the air cooler. The volume, and the air flow rate is reduced, so that the power of the fan driving the air flow is reduced, which has an energy-saving effect.

Description

technical field [0001] The invention relates to a single-tube-pass air cooler, in particular to a method for improving heat transfer efficiency by changing the flow cross-sectional area in the tube in the cooling stage of the single-tube-pass air cooler in which the medium in the tube is first condensed and then cooled. Background technique [0002] An air cooler is a type of heat exchanger that uses air as a cooling fluid to cool or condense another fluid with a higher temperature. Single tube pass means that the fluid in the tube flows from one side of the tube box to the other side of the tube box at one time and then flows out of the air cooler. The fluid in the tube is generally condensed first, and then cooled. Condensation refers to cooling the gas into a liquid, and the fluid undergoes a phase change. Cooling refers to cooling a liquid with a higher temperature into a liquid with a lower temperature. In the cooling stage, because the density of the liquid is much hi...

AI Technical Summary

Problems solved by technology

However, some process fluids do not allow bending flow, that is to say, multi-tube flow is not allowed, and only single-tube flow is allowed, otherwise it will cause fluid denaturation or blockage.

Even if some fluids allow multi-pass flow, the structure of multi-pass flow is obviously more complex than that of single-pass

At present, when the single-tube air cooler is used in the industry to condense and cool the process fluid, there is no method of changing the flow cross-sectional area of ​​the tube. In this way, the heat transfer coefficient in the cooling stage is very small, and the heat transfer efficiency is very low. Make up for the heat transfer area, resulting in waste of materials, increase in the volume of the air cooler, and increase the power consumption of the fan

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