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Vertical shell-and-tube heat exchanger and its block-proof method

A shell-and-tube heat exchanger and heat exchanger technology, applied in the field of polyolefin production, can solve problems such as single flow state of tube-side fluid, blockage of external circulation heat exchanger, large flow stagnation area, etc., to reduce deposition viscosity Possibility of knots, elimination of flow stagnation zones, effect of reducing particle stagnation zones

Active Publication Date: 2009-01-21
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional shell-and-tube heat exchanger, the flow state of the tube-side fluid is relatively simple, the degree of turbulence is low, the flow stagnation area is large, and there are many heat and mass transfer dead zones.
[0005] At present, there is no practical and effective solution to the clogging of the slurry external circulation heat exchanger, which often leads to the clogging of the external circulation heat exchanger, the heat exchange efficiency is greatly reduced, frequent production shutdown accidents, and severe cases lead to shutdown of production and return of materials to start again

Method used

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  • Vertical shell-and-tube heat exchanger and its block-proof method
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  • Vertical shell-and-tube heat exchanger and its block-proof method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 As shown, in the traditional shell-and-tube heat exchanger, the fluid is introduced into the heat exchange tube from the fluid inlet at the lower tube box 6 through the lower tube sheet, and then from the other end of the heat exchange tube to the outlet of the upper tube box 7 through the upper tube sheet flow out of the heat exchanger. The flow state of the fluid in the tube side is relatively simple, and the degree of turbulence is relatively low. For the slurry heat exchange medium in the flow stagnation zone, after the slurry is introduced into the tube side of the heat exchanger and exchanged heat through the heat exchange tube, the temperature drop will cause the polymer to flow from the slurry to the heat exchange tube. Cohesion occurs in precipitation, especially in flow stagnation areas, such as between the parts of heat exchange tubes protruding from the tube sheet ( figure 1 Middle 1 area), the side wall area of ​​the tube box ( figure 1 T...

Embodiment 2

[0040] see image 3 , the method of the present invention is used to set the internal component deflector in the upper tube box and or the lower tube box of the heat exchanger, and the slurry flows through the internal component deflector to form a flow along the axial direction of the heat exchanger and the radial direction of the heat exchanger. flow. The main parameters are shown in Table 2:

[0041] Table 2

[0042]

[0043] In the process of producing high-density polyethylene by slurry method, using the tubular heat exchanger of the present invention, the operating conditions are: the inlet temperature of the tube-side fluid is 78-85°C, the outlet temperature is 73-80°C, and the operating pressure is 0.23-0.70MPa , slurry flow rate 4m / s, slurry concentration 450g particles / L solvent, slurry particle density 0.950g / cm 3 , The particle size of the slurry is 100-200 mesh; the inlet temperature of the shell-side cooling water is 25-34°C, the outlet temperature is 55-65...

Embodiment 3

[0045] see Figure 4 , the method of the present invention is used to set the internal component deflector in the upper tube box and or the lower tube box of the heat exchanger, and the slurry flows through the internal component deflector to form a flow along the axial direction of the heat exchanger and the radial direction of the heat exchanger. flow. The main parameters are shown in Table 3:

[0046] table 3

[0047]

[0048] In the process of producing high-density polyethylene by slurry method, using the tubular heat exchanger of the present invention, the operating conditions are: the inlet temperature of the tube-side fluid is 78-85°C, the outlet temperature is 73-80°C, and the operating pressure is 0.23-0.70MPa , slurry flow rate 4.0m / s, slurry concentration 450g particles / L solvent, slurry particle density 0.950g / cm 3 , The particle size of the slurry is 100-200 mesh; the inlet temperature of the shell-side cooling water is 25-34°C, the outlet temperature is 55...

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Abstract

The invention discloses a tube shell type heat exchanger and its blockade prevent method, the inner diversion component installs on the up tube box or down tube down of the heat exchanger, the slurry flows over the diversion component along the axis direction of the heat exchanger and the radial direction of the heat exchanger. The invention method and the used heat exchanger eliminated the flow block area, enhanced the heat transfer and mass transfer. Using the fluid medium to erode the tube box of the heat exchanger and the wall of the tube sheet, reduced the particle block area in the slurry, effectively prevented the deposition of polymer and avoided the plug of the heat exchanger. At the same time it reduced the polymer deposition possibility in the wall.

Description

technical field [0001] The invention relates to an anti-blocking method of a slurry shell-and-tube heat exchanger and the anti-blocking heat exchanger, which are mainly used in polyolefin production. Background technique [0002] Polyolefins are widely used in various fields such as agriculture, chemical industry, light industry, textile and machinery, national defense, medicine, transportation, and construction. The slurry method is an important method for the production of polyolefins. It generates suspended polymer solid particles in a solution, and the generated polymer particles form a slurry with a solvent. This method has mature technology, mild reaction conditions, easy control, stable operation, good product performance and many grades, and is widely used. With the development of the national economy, the market demand for polyolefins is increasing, and the expansion and transformation of existing polyolefin plants is imperative. The slurry external circulation he...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28D1/04F28F9/22
Inventor 阳永荣蒋浩王靖岱蒋斌波顾越峰殷大斌
Owner SINOPEC YANGZI PETROCHEM