Shell and Tube Type Heat Exchanger is mainly composed of shell, tube sheet, heat exchange tube, head, baffle and so on. The required materials can be made of ordinary carbon steel, copper, or stainless steel. During heat exchange, one fluid enters from the connecting pipe of the head, flows in the pipe, and flows out from the outlet pipe at the other end of the head. This is called the tube process; the other fluid enters from the connecting pipe of the shell, from The outflow at the other nozzle on the shell is called the shell side.
It is an efficient and energy-saving equipment. Due to its strong structure, high elasticity and strong adaptability, it has made a lot of improvements in structure, process and materials in recent years, making its technical performance more reasonable and advanced.
Working principle of Shell and Tube Type Heat Exchanger
The heat medium of the tube-type cooler is the inlet of the tube on the cylinder, which sequentially flows through the baffle channels to the outlet of the pipe. The cooling medium adopts a double-pipe flow, that is, the cooling medium is separated from the water inlet through the water. After the cover enters half of the cooling pipe, it flows from the return water cover into the other half of the cooling pipe and enters the other side of the water separation cover and the outlet pipe. During the flow of the cold medium in the double-pipe flow process, the residual heat absorbed by the heat medium is discharged from the water outlet, so that The working medium keeps the rated working temperature.
Use and operation
1. When the cooler equipment does not sink, leave enough space to allow the tube bundle to be extracted from the shell. When the equipment is in place, it should be carried out according to the lifting specifications. After the leveling is corrected, tighten the anchor screws to connect the cold and hot Media inlet and outlet tubes.
2. Before starting the cooler, the air in the cavity should be exhausted to improve the heat transfer efficiency. The steps are:
(1), loosen the vent plug on the hot and cold media ends, and close the media discharge valve;
(2), slowly open The inlet valve of the hot and cold medium, so that the hot and cold medium overflows from the vent hole, then tighten the vent plug to close the inlet valve.
3. When the water temperature rises 5～10℃, open the inlet valve of the cooling medium (Note: Never open the inlet valve quickly, because a large amount of cooling water flows through the cooler, it will form a layer on the surface of the heat exchanger for a long time The "supercooling layer" with poor thermal conductivity), and then open the inlet and outlet valves of the heat medium to make it flow, and then pay attention to adjust the flow of the cooling medium to keep the heat medium at the optimal temperature.
4. If electrochemical corrosion occurs on the side of the cooling water, zinc rods can be installed at the designated location.
5. Before the dirty medium passes through the cooler, there should be a filter device.
6. The pressure of the cooling medium should be greater than the pressure of the cooling medium.
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