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Safety valve for polypropylene loop reactor

A loop reactor and polypropylene technology, applied in the field of safety valves, can solve problems such as blocked inlets, medium stagnation, and working effectiveness, and achieve the effects of avoiding direct impact, easy maintenance, and easy disassembly and assembly

Active Publication Date: 2013-10-09
BEIJING AEROSPACE PROPULSION INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polypropylene reaction process requires a relatively coherent circulation process, and local accumulation and wall hanging must be avoided. The sealing pair of a conventional safety valve is a certain distance from the valve inlet. When installed on the equipment, it will be in the area between the inlet and the sealing pair. Form a medium "flow dead zone", causing the medium to stagnate in this area
If a safety valve with a conventional structure is installed on the loop reactor, due to the characteristics of the polypropylene medium, polypropylene particles will accumulate in the "flow dead zone", block the inlet, and affect the normal operation of the equipment
Moreover, after the safety valve is opened, the solid particles in the medium will impact the bellows, causing the bellows to work effectively and unable to balance the pressure.
Therefore, the inlet, flow channel structure and back pressure isolation structure of the conventional safety valve cannot meet the actual needs of the polypropylene loop reactor device.

Method used

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  • Safety valve for polypropylene loop reactor
  • Safety valve for polypropylene loop reactor
  • Safety valve for polypropylene loop reactor

Examples

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Embodiment Construction

[0019] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0020] Such as figure 1 The bellows assembly shown includes a lower joint 23, an upper joint 24 with a hole in the middle, and a bellows 25.

[0021] figure 2 The structure diagram of the pressure ring 4 is given. The pressure ring 4 is a circular disc with a circular table 28 on the upper end. A boss 29 is machined on the upper surface of the circular table 28.

[0022] Such as image 3 As shown, the main body of the guide sleeve 11 is a cylinder 39, the upper end of the cylinder 39 is fixedly installed with a circular pressure plate 40, and the upper and lower edges of the circular pressure plate 40 are provided with circular grooves 41.

[0023] Such as Figure 4 As shown, the upper end of the valve disc 2 is processed into a cylinder 31, the lower end side wall is processed into a conical surface 32, the lower surface of the valve disc 2 is provided w...

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PUM

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Abstract

The invention relates to the technical field of polypropylene reaction equipment, in particular to a safety valve for a polypropylene loop reactor. In the safety valve, the entrance of a valve seat is in an arc shape; a seal surface and a horizontal surface of the valve seat form an angle of 45 degrees; the entrance of a cavity is provided with a press ring; a valve clack is fixedly connected to the press ring; a press rod is arranged above the valve clack; by a structure, a medium in the loop reactor can smoothly pass through the valve seat of the safety valve and is prevented from being collected and crystallized at the entrance of the safety valve to block a pipeline; the safety valve is relieved and rapidly meets the requirement so as to ensure that the safety valve has enough relieving capability; the safety valve can still stably run in an environment of relatively high back pressure; a seal structure of the safety valve for the loop reactor is a soft seal structure, so the tightness of the safety valve is ensured under the conditions of the existence of solid particles in the medium and high pressure; and the seal structure is easy and convenient to disassemble and assemble, a failure seal ring can be simply and conveniently disassembled and replaced, and repair and maintenance are facilitated.

Description

Technical field [0001] The invention belongs to the technical field of polypropylene device reaction, and specifically relates to a safety valve. Background technique [0002] The currently widely used polypropylene production process technology is the liquid phase bulk method, and most of this process technology uses loop reactors as reaction equipment. However, the polypropylene reaction process requires a more coherent flow process, and local accumulation and wall hanging must be avoided. The sealing pair of conventional safety valves is a certain distance from the valve inlet. When installed on the equipment, it will be in the area between the inlet and the sealing pair. The formation of the medium "flow dead zone", resulting in stagnation of the medium in this area. If a conventional safety valve is installed on the loop reactor, due to the characteristics of the polypropylene medium, polypropylene particles will accumulate in the "flow dead zone", block the inlet, and affe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16K17/04F16K1/48F16K27/02
Inventor 唐一鸣闫祁张萍
Owner BEIJING AEROSPACE PROPULSION INST
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