Shell-and-tube heat exchanger with sliding guiding support and inner expansion joint

Abstract

The invention discloses a shell typed heat exchanger with sliding conductive bearing piece and inner bulking node, which comprises the following parts: case, tube bank, fixing pipe board, floating pipe board, roll end, bulking node and sliding conductive bearing piece, wherein one end of tube bank connects the fixing pipe board and the other end connects the floating pipe board; the fixing pipe board is fixed at one end of the case; the sliding conductive bearing piece is supported under the floating pipe board; the roll end is set at two ends of case; one end of bulking node connects the inner wall of the roll end and the other end connects the floating pipe board; two ends of case has inlet and outlet of fluid A; the inlet and outlet of fluid are set on the roll end. The invention avoidsleakage between tube pass and shell pass to ensure the free extension of tube pass of heat exchanger, which is fit for the occasion of heat exchange and other leaking influence between reacting product and reacting material with high reliability and manufacturing benefit.

Description

technical field [0001] The invention relates to a shell and tube heat exchanger. Background technique [0002] In the chemical industry and petrochemical industry, heat exchangers are widely used and are indispensable and commonly used process equipment, which can be seen everywhere in daily life. According to statistics, heat exchangers account for about 40% of the total equipment in oil refining and chemical plants, and the investment accounts for 30-45% of the total investment. In recent years, with the development of energy-saving technology, the use of heat exchangers to recover high-temperature and low-temperature heat energy has brought significant economic benefits. At present, in the heat exchange equipment, the shell and tube heat exchanger is the most widely used. With the development of petroleum industry and chemical industry, more and more shell and tube heat exchangers are used in various harsh conditions, such as hydrocracking of oil refining, kerosene hydr...

AI Technical Summary

Problems solved by technology

But when adopting horizontal type, such as attached figure 2 As shown, the stuffing box seal is in a state of unbalanced circumferential force. Due to the self-weight of the floating tube sheet and tube bundle, the lower packing is in a relatively more compact state, while the upper packing is in a relatively loose state. From this point of view, leakage is almost inevitable, especially after repeated heating and cooling operations, it will inevitably bring considerable leakage, which will affect the normal and stable operation of the device, or cause unnecessary energy and material losses.

For example, on the ethylbenzene dehydrogenation styrene plant, as reported on the sixth page of "Petrochemical Equipment Technology" 21 Volume 5 Issue 2000, a horizontal floating head stuffing box heat exchanger is used for the second reaction of ethylbenzene dehydrogenation The high temperature material at the outlet of the reactor is exhausted by the waste heat of ethylbenzene dehydrogenation. The first reactor imports the material. The temperature of the hot fluid is heated from 560-580°C in the tube side, and the temperature of the cold fluid is cooled to 320-360°C. The temperature of the cold fluid in the shell side is heated from about 100°C. To 500 ℃, the temperature difference between the shell and tube side is large, and the tube bundle is damaged repeatedly, resulting in the failure of the heat exchanger equipment

Leakage accidents occurred repeatedly, resulting in a serious drop in reactor efficiency until normal production could not be maintained

The two types of accidents resulted in multiple forced shutdowns, which became bottlenecks restricting production

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