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Recirculating gas cooler system for gas phase polymerization process

A gas cooler, gas phase polymerization technology, applied in the improvement field of increasing the length of the straight pipe between the upstream elbow and the inlet of the cooler, reducing the fouling tendency of the cooler, and can solve problems such as loss of production time

Inactive Publication Date: 2017-07-07
UNIVATION TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are considerable losses associated with reactor shutdown, including for example lost production time

Method used

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  • Recirculating gas cooler system for gas phase polymerization process
  • Recirculating gas cooler system for gas phase polymerization process
  • Recirculating gas cooler system for gas phase polymerization process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Three simulation experiments were carried out using industrial finite volume computational fluid dynamics procedures, starting with the basic scheme, which generally applies the attached image 3 The design is shown, and then the effects of varying the disclosed parameters are analyzed below. Simulation 1 had an upstream elbow which was a standard radius 90° elbow (R 1 / D 1 value 1), connected to the inlet pipe 46, and the L of the inlet pipe 46 1 for 15 feet. Simulation test 2 is the same as simulation test 1, except L 1 Extends to 30 feet. Simulation test 3 is the same as simulation test 1, except that the upstream elbow is a long radius 90° elbow (R 1 / D 1 value is 3). The simulation model measures the flow profile of the axial recycle stream at the fluid inlet 40 . Use the following conditions for this simulation test:

[0073] Table 1

[0074] parameter Simulation conditions superficial gas velocity 2.4ft / sec in a 17ft inner diameter po...

Embodiment 2

[0082] An additional four simulations were performed using an industrial finite volume computational fluid dynamics protocol to analyze the effect of changing the cooler tube inlet geometry, such as tube 50 . Contrast simulation test 4 using the straight pipe inlet described in the prior art, as attached Figure 5 shown. Simulation test 5 using flared tube inlet r 2 / D 2 The value is 0.15, as attached Figure 7 shown. In simulation test 6, the inlet of the flared tube is conical, and the conical angle θ is 20°, as shown in the attached Figure 6 shown. In simulation test 7, the inlet of the flared tube is conical, and the conical angle θ is 30°, as shown in the attached Figure 6 shown. The simulation simulates a monolithic tube and its nearest neighbors each using symmetric boundaries. The discretization used was third order for the momentum equation (quick flow chart) and second order for the turbulence parameters. For this simulation experiment, the following condi...

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Abstract

This invention relates to improvements for reducing the tendency of cooler fouling in recycle gas cooler systems in gas phase polymerization processes, including recycle gas cooler systems comprising shell and tube heat exchangers. The tube or tubes of the shell-and-tube heat exchanger may have flared tube inlets at the tube sheet. The shell and tube heat exchanger can also be connected to a straight inlet pipe, which can be at least about 5 times the inner diameter of the straight inlet pipe or at least about 15 feet in length, whichever is longer.

Description

Background technique [0001] The present invention relates generally to improvements for reducing the tendency of coolers to foul in recycle gas cooler systems of gas phase polymerization processes. [0002] Polymerization and catalyst development have resulted in new polymers with improved physical and mechanical properties for a variety of products and applications. With the development of new catalysts, the choice of polymerization methods, such as solution, slurry, high pressure or gas phase methods for the preparation of specific polymers, has been greatly expanded. Developments in polymerization technology have also provided more efficient, high-yielding and improved economic processes. [0003] One technique for polymer production involves gas phase polymerization methods. In gas-phase polymerization processes, recycle gas is generally withdrawn from the polymerization reactor and used via coolers for removal of the heat of reaction and optionally also for partial cond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28F19/00F28D7/16F28F9/26F28F9/02
CPCF28F9/0256F28F9/26F28F19/00F28D7/16F28F13/06C08F2/01C08F2/34
Inventor 蔡平J·L·斯维克M·W·布拉德L·J·德尔特施F·D·赫赛恩
Owner UNIVATION TECH LLC