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Method and device for predicting node temperature of shell and tube heat exchanger

A shell-and-tube heat exchanger and prediction method technology, applied in the field of heat transfer, can solve the problems of scattered functions, backward testing methods, low testing accuracy, etc.

Inactive Publication Date: 2011-11-30
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The technical problem to be solved by the present invention is to propose a new structure and design a method for predicting the node temperature of a shell-and-tube heat exchanger in view of the shortcomings of the existing heat exchange tube test device, such as scattered functions, low test accuracy and backward test methods. The method can get the temperature value of each node inside the heat exchanger

Method used

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  • Method and device for predicting node temperature of shell and tube heat exchanger
  • Method and device for predicting node temperature of shell and tube heat exchanger
  • Method and device for predicting node temperature of shell and tube heat exchanger

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Embodiment 1: Example of single-tube heat exchange tube testing device of the present invention: as Image 6 shown

[0072] (1) Combined barrel sections 5, 7, 9, and 11 are used as the shell side shell. Each barrel section is composed of a round pipe, a flange at the end of the barrel section, and a connecting pipe at the upper and lower parts of the barrel section. The inner diameter of the circular tube is 1.5 to 2 times the outer diameter of the heat exchange tube 2 to be tested. The cylinder joints are connected by gasket bolt flange connection structure. By changing the number of cylinder sections, the axial length of the shell side can be changed to meet the test requirements of heat exchange tubes with different lengths. All parts are made of stainless steel, round pipe and connecting pipe, round pipe and flange, connecting pipe and flange are all welded.

[0073] (2) Connect a bellows barrel section 14 at one end of the barrel section. The corrugated tube...

Embodiment 2 test example

[0078] Embodiment 2: Example of the heat transfer performance test of the heat exchange tube of the present invention: as Figure 7 shown

[0079] (1) The inlet of the single-tube heat exchange tube testing device of the present invention is connected to the valve 3, and the temperature and pressure of the fluid at the inlet of the tube are measured by the temperature sensor 1 and the pressure sensor 2;

[0080] (2) The outlet of the heat exchange tube is connected to the valve 22, and the temperature and pressure of the fluid at the outlet of the tube side are measured by the temperature sensor 23 and the pressure sensor 24;

[0081] (3) The inlet pipe of the shell-side barrel section ( Image 6 Upper 6, 8, 10, 12) are connected with valves 7, 8, 9, 10 respectively. Valves 7, 8, 9, and 10 are connected to the shell-side flow distributor 6 through 4 hoses, and the lengths of the 4 hoses are the same to ensure that the fluid flowing from the shell-side flow distributor 6 fl...

Embodiment 3

[0094] Embodiment 3. Example of node temperature prediction of the shell-and-tube heat exchanger of the present invention: as Figure 8 shown

[0095] (1) According to the geometric characteristics of the shell-and-tube heat exchanger, the heat exchange tube bundle is divided into several sections by the baffle, such as Figure 8 As shown, the flow direction of the shell-side fluid is perpendicular to the flow direction of the tube-side fluid. Neglecting the influence of the particularity of fluid flow and heat transfer in the tube layout area near the wall of the cylinder on the overall performance of shell side flow and heat transfer, the shell side fluid has periodic characteristics in the horizontal direction, so a periodic heat exchange tube bundle can be used for temperature field analysis . The number of heat exchange tubes in the vertical direction of the heat exchange tube bundle of this cycle is the same as that of the actual heat exchanger, and the number of hea...

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Abstract

The invention belongs to the technical field of heat transfer and discloses a method and a device for predicting the node temperature of a shell and tube heat exchanger. The invention relates to a single-tube heat exchange tube testing device; based on the device, the heat transfer characteristics of a single heat exchange tube can be acquired; and the node temperature of tube pass and shell passfluid of the shell and tube heat exchanger can be determined by matching the method for predicting the node temperature of the shell and tube heat exchanger. The method mainly comprises the followingsteps of: determining the length of a tested heat exchange tube section according to a space between baffles in the heat exchanger, determining a cylinder section number needed by constructing a shell pass cylinder, processing a heat exchange tube sealing plate, welding a tube flange, and assembling a testing device; determining testing parameters according to tube pass and shell pass inlet / outlet temperatures of the heat exchanger, testing the heat transfer performance of the heat exchange tube section, and establishing a mapping relationship between single tube inlet / outlet temperatures andupstream and downstream fluid temperatures outside the tube; and starting a computer program, inputting design data of the heat exchanger, executing an analysis command, and outputting a temperature value of each node inside the heat exchanger after the analysis is ended.

Description

technical field [0001] The invention belongs to the technical field of heat transfer. It relates to a test device for a single-tube heat exchange tube, based on which the heat transfer characteristics of a single heat exchange tube can be obtained, and combined with the prediction method for the node temperature of the shell-and-tube heat exchanger proposed in the present invention, the temperature of the shell-and-tube heat exchanger can be determined. The nodal temperatures of the tube-side and shell-side fluids. Background technique [0002] The shell and tube heat exchanger is the most widely used heat exchanger in the process industry. It is mainly composed of shell, tube sheet, heat exchange tube, head, baffle and other components, and can use stainless steel, ordinary carbon steel, copper or other non-ferrous metals as materials. During operation, one kind of fluid enters through the connecting pipe of one end of the head, passes through the heat exchange tube, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K13/02
Inventor 周剑锋李洋顾伯勤董金善黄星路邵春雷
Owner NANJING UNIV OF TECH
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