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How to Prevent Fires in Shot Blasting Machines
发布时间:
2026-07-31
Preventing fires in shot blasting machines requires a comprehensive, multi-facet
Preventing fires in shot blasting machines requires a comprehensive, multi-faceted approach encompassing fire source control, dust management, equipment selection, electrostatic protection, operational protocols, and emergency measures. The specific measures are as follows:
I. Control of Ignition Sources and High Temperatures
Strict Prohibition of Open Flames and High-Temperature Operations: Smoking, electric welding, or gas cutting are strictly prohibited in the vicinity of the shot blasting machine. If such operations are absolutely necessary, the surrounding dust must be thoroughly cleared, and a waiting period of at least 10 minutes must elapse before restarting the machine.
Control of Machine Body Temperature: When processing steel plates, the internal temperature of the shot blasting machine must be maintained below 80°C. After a period of continuous operation, the machine should be shut down to allow it to cool down.
Prevention of Hot Particles Entering the Dust Collection System: The impact of steel shot against workpieces may generate high-temperature particles or sparks; therefore, a spark arrestor or cooling device must be installed at the inlet of the dust collection duct.
II. Standardized Dust Management
Daily Dust Removal Protocol: Iron rust dust is classified as a Class II flammable solid; the smaller the particle size, the greater the risk of flammability and explosion. Therefore, it is mandatory to perform dust removal "once daily" to prevent accumulation.
Periodic Back-flushing and Dust Discharge: Back-flushing to clear dust must be conducted during every shift to prevent excessive dust accumulation in the hopper, which could lead to spontaneous combustion.
Wet Treatment or Prompt Transport: Collected dust may be treated using wet methods or transported as soon as possible to a specialized facility for disposal; care must be taken during transport to avoid impact or friction.
III. Equipment Optimization and Selection
Select Flame-Retardant, High-Temperature-Resistant Filter Media: Filter cartridges should be constructed from flame-retardant materials capable of withstanding temperatures exceeding 200°C—such as PTFE or fiberglass—to prevent standard polyester filter media from igniting under high-temperature conditions.
Ensure a Sound Dust Collection System Design: Select equipment from reputable manufacturers to prevent localized dust accumulation—and the subsequent formation of "hotspots"—caused by turbulent airflow or inadequate sealing.
Install an Automatic Fire Suppression System: It is recommended to configure an automatic fire suppression device utilizing ultra-fine dry powder propelled by high-pressure nitrogen; this system ensures millisecond-level response times and provides coverage for high-risk areas, such as shot-blasting chambers and dust collector housings.
IV. Static Electricity Control
Enhance Grounding System: Ensure that all metal components of the equipment are independently grounded, with a grounding resistance of ≤10Ω; inspect the integrity of the grounding wires on a monthly basis.
Utilize Anti-Static Filter Media: Filter cartridges must be constructed from anti-static materials or feature an anti-static coating applied to their surface.
Install Static Elimination Devices: Install ion nozzles or high-voltage static eliminators within the dust inlet ductwork
V. Personnel Training and Operational Standards
Pre-job Training: Operators and maintenance personnel must undergo practical training covering dust explosion prevention, electrostatic hazards, and emergency response procedures; they may only assume their duties after passing the requisite assessments.
Standardized Start-up and Shut-down Procedures:
Start the dust collector first, and wait until its operation has stabilized before switching on the shot blasting machine;
When shutting down, turn off the shot blasting machine first, and allow the dust collector to continue running for an additional 10–15 minutes before stopping it.
Unauthorized Parameter Adjustment Prohibited: Do not arbitrarily increase shot blasting intensity or decrease the dust-cleaning frequency, to prevent system overload.
VI. Monitoring and Emergency Preparedness
Installation of Temperature and Flame Detectors: Install temperature-sensing cables and infrared/ultraviolet flame detectors at critical locations (e.g., hoppers and filter cartridge chambers). In the event of an over-temperature condition (e.g., exceeding 90% of the filter cartridge's maximum temperature tolerance), an automatic alarm shall be triggered, and the system shall shut down.
Provision of Firefighting Equipment: Dry chemical fire extinguishers and carbon dioxide fire extinguishers shall be provided on-site. The use of water-based fire extinguishers to combat metal dust fires is strictly prohibited.
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