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System and method for preventing burning explosion of dust bin

A silo and dust technology, which is applied in the field of systems for preventing dust silo explosions, can solve problems such as the inability to completely eliminate static electricity, the inability to completely avoid explosion accidents, and the high risk of explosions.

Pending Publication Date: 2020-09-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dust silo generally adopts the blowback system to remove the combustible gas entrained in the dust, but the ventilation mode, air volume and operation mode of the existing polyolefin silo in China are based on the normal working conditions of the production process such as reaction and gas recovery unit. If there is a temporary failure or damage of equipment or instruments, poor upstream response, processing of unqualified or transitional materials, failure of the material cutting valve in the silo, and other abnormal working conditions, there will be a high risk of explosion
In addition, although the discharge of powder can be effectively suppressed by installing static electricity monitoring and elimination equipment in the silo, the electricity elimination efficiency of the static eliminator is generally 80-90%, which cannot completely eliminate static electricity, and cannot avoid open flames, electric heating, and radiation shock waves. , arc, high temperature and other ignition sources
[0004] To sum up, in view of the explosion risk existing in polyolefin dust silos, existing safety control measures cannot completely avoid explosion accidents

Method used

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  • System and method for preventing burning explosion of dust bin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] A silo stores low density polyethylene (LDPE) powder, the silo adopts figure 1 In the described system for preventing dust silo explosion, three groups of combustible gas concentration detectors 11, 12, 13 (specifically hydrocarbon detectors) and three groups of combustible powder concentration detectors are evenly arranged in the gas phase space at the top of the silo 1. 21, 22, 23 (specifically polyethylene dust concentration detectors) and three sets of spark detectors 31, 32, 33, can monitor the flammable gas and dust concentration and spark intensity at different positions on the top of the silo 1 in real time, and transmit the data to control unit 5. When the hydrocarbon detector detects that the ethylene concentration in the silo suddenly rises to 25% LEL, the alarm device 6 issues an alarm, and simultaneously opens the control valve on the gas purging device 4 (specifically, the nitrogen purging device), and nitrogen enters the silo. Replacement and inerting ar...

Embodiment 2

[0070] A silo stores low density polyethylene (LDPE) powder, the silo adopts figure 1 In the described system for preventing dust silo explosion, three groups of combustible gas concentration detectors 11, 12, 13 (specifically hydrocarbon detectors) and three groups of combustible powder concentration detectors are evenly arranged in the gas phase space at the top of the silo 1. 21, 22, 23 (specifically polyethylene dust concentration detectors) and three sets of spark detectors 31, 32, 33, can monitor the flammable gas and dust concentration and spark intensity at different positions on the top of the silo 1 in real time, and transmit the data to control unit 5. When the polyethylene powder in the silo is fed, the flow rate fluctuates suddenly, and then the polyethylene dust detector detects that the polyethylene concentration in the silo suddenly rises to 45% MEC, and the alarm device 6 issues an alarm, and at the same time automatically turns on the gas purge The control v...

Embodiment 3

[0072] A silo is used to store low density polyethylene (LDPE) powder. figure 1 In the described system for preventing dust silo explosion, three groups of combustible gas concentration detectors 11, 12, 13 (specifically hydrocarbon detectors) and three groups of combustible powder concentration detectors are evenly arranged in the gas phase space at the top of the silo 1. 21, 22, 23 (specifically polyethylene dust concentration detectors) and three sets of spark detectors 31, 32, 33 can monitor the concentration of combustible gas and dust and spark intensity at different positions on the top of the silo 1 in real time, and transmit the data to control unit 5. When a spark infrared signal (its intensity is 110 μJ) is suddenly detected in the silo, the alarm device 6 issues an alarm, and at the same time, the control valve on the gas purging device 4 (specifically, the nitrogen purging device) is automatically opened, and the nitrogen enters the silo. After replacement and in...

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Abstract

The invention provides a system for preventing burning explosion of a dust bin, and belongs to the technical field of petrochemical safety. The system for preventing burning explosion of the dust bincomprises a concentration monitoring device, a spark monitoring device, a gas blowing device and a control device; the concentration monitoring device is used for monitoring combustible gas concentration and combustible dust concentration in the dust bin; the spark monitoring device is used for monitoring the intensity of infrared radiation emitted by sparks in the bin; the gas blowing device is used for blowing gas in the bin; and when it is determined that a monitoring value is higher than a certain set threshold value, the control device is used for giving an alarm according to the monitored combustible gas concentration, the combustible dust concentration and the intensity of the infrared radiation emitted by the sparks and controlling the gas blowing device to conduct blowing. According to the technical scheme, and dust explosion can be effectively restrained.

Description

technical field [0001] The invention relates to the technical field of petrochemical safety, in particular to a system and method for preventing dust silo explosion. Background technique [0002] With the increase in the number and scale of polyolefin production units, accidents of silo flash explosion occur frequently during powder production, storage and transportation. During the storage or transportation of dust materials, combustible dust usually forms a mixed system with combustible gas. As the powder is sent to the silo by the wind, the combustible gas components adsorbed on the surface of the solid particles will continuously escape in the silo, making the combustible gas and polyolefin dust form a mixed system. In addition, when the upstream reaction is not good, gas recovery or uncontrolled silo gas ventilation and other abnormal conditions will also cause a sudden increase in the concentration of combustible gas in the silo. Similarly, in the pulverized coal tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B65D90/48B65D90/22
CPCB65D90/22B65D90/48
Inventor 刘静如张帆费轶王振刚李亮亮贾学五
Owner CHINA PETROLEUM & CHEM CORP
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