A system for determining a risk level for particles moving along a path of movement from a first position to a second position includes a sensor arrangement and processing device. The sensor arrangement includes at least one set of sensing elements including at least two sensing elements arranged to co-operate with mutually separated sensing zones along the path of movement of the particles to detect a signal related to temperature of the particles. The processing device is arranged to: receive signals from the sensor arrangement; form signals from the sensing elements into a pulse train when a particle moves through field-of-view of the sensor arrangement; and based on the pulse train, determine a risk level for the particles. The processing device is arranged to adapt at least one parameter used in the determination of the risk level based on at least one property of the particles moving along the path of movement from the first position to the second position.

A system for monitoring of temperature trends for particles moving along a path of movement from a first position to a second position includes a sensor arrangement and processing device. -The sensor arrangement includes at least two sensing elements detecting radiation emitted from the particles, arranged to co-operate with mutually separated sensing zones along the path of movement of the particles to detect a signal related to the temperature of particles. The processing device is arranged to: receive signals from the sensor arrangement; form signals from the at least one set of sensing elements into at least one pulse train when a particle moves through the field-of-view of the sensor arrangement; and based on this at least one pulse train monitor changes over time in the temperature of particles moving through the field-of-view of the sensor arrangement by monitoring changes over time in the wavelength distribution of the radiation emitted from the particles.

A system for monitoring of temperature trends for particles moving along a path of movement from a first position to a second position includes a sensor arrangement and processing device. -The sensor arrangement includes at least two sensing elements detecting radiation emitted from the particles, arranged to co-operate with mutually separated sensing zones along the path of movement of the particles to detect a signal related to the temperature of particles. The processing device is arranged to: receive signals from the sensor arrangement; form signals from the at least one set of sensing elements into at least one pulse train when a particle moves through the field-of-view of the sensor arrangement; and based on this at least one pulse train monitor changes over time in the temperature of particles moving through the field-of-view of the sensor arrangement by monitoring changes over time in the wavelength distribution of the radiation emitted from the particles.

Various aspects of the invention are directed to a triggering device for a quickly triggering extinguishing system for explosion suppression. In some embodiments of the present disclosure, the triggering device may include a pawl body having a pawl flank, a catch, at least one electromagnet to transmit an electromagnetic field, and a sliding pin. The sliding pin triggers an extinguishing system for explosion suppression by movement from a blocking position into a release position. In the blocking position, the sliding pin is pushed against the pawl flank of the pawl body by means of the catch and is held in the blocking position by said pawl flank. The pawl body releases the engagement of the catch and the pawl flank, and thereby releases the sliding pin, in response to the at least one electromagnet exerting the electromagnetic field on the pawl body.

Various aspects of the invention are directed to a triggering device for a quickly triggering extinguishing system for explosion suppression. In some embodiments of the present disclosure, the triggering device may include a pawl body having a pawl flank, a catch, at least one electromagnet to transmit an electromagnetic field, and a sliding pin. The sliding pin triggers an extinguishing system for explosion suppression by movement from a blocking position into a release position. In the blocking position, the sliding pin is pushed against the pawl flank of the pawl body by means of the catch and is held in the blocking position by said pawl flank. The pawl body releases the engagement of the catch and the pawl flank, and thereby releases the sliding pin, in response to the at least one electromagnet exerting the electromagnetic field on the pawl body.

Provided is a foamed dust composition and a method of using the foamed dust composition. The foamed dust composition contains an aqueous foam comprising a foaming agent, a foam stabilizer, water, and a rock dust. The foamed dust composition is sprayed onto coal mine surfaces to prevent coal dust explosion in the event of a fire.

Provided is a foamed dust composition and a method of using the foamed dust composition. The foamed dust composition contains an aqueous foam comprising a foaming agent, a foam stabilizer, water, and a rock dust. The foamed dust composition is sprayed onto coal mine surfaces to prevent coal dust explosion in the event of a fire.

The present invention discloses a device for pulverization and explosion suppression of low carbon gas hydrate (LCGH). A feeding chamber connects with a pulverizing chamber, and the chambers communicate through a feed port. A pulverizing air pipe and the feeding chamber communicate through a feeding air pipe; two ends of a venturi connect with an entrainment chamber and a disperser respectively; and a gas-solid separation membrane (GSSM) is disposed on a discharging port and used for preventing LCGH powder from entering the entrainment chamber from the pulverizing chamber. When an explosion is triggered, the GSSM is opened to make the LCGH powder enter the entrainment chamber. The device can store and pulverize the LCGH and spray LCGH powder to achieve combustion and explosion suppression.

The invention relates to an apparatus for handling bulk material which contains fines which can lead to formation of explosive dust/air mixtures, where the apparatus comprises moveable internals in a housing which comes into contact with bulk material, characterized in that the moveable internals and/or the interior of the housing which comes into contact with bulk material consist of aluminum bronzes or are lined and/or coated with the aluminum bronzes.

The invention relates to an apparatus for handling bulk material which contains fines which can lead to formation of explosive dust/air mixtures, where the apparatus comprises moveable internals in a housing which comes into contact with bulk material, characterized in that the moveable internals and/or the interior of the housing which comes into contact with bulk material consist of aluminum bronzes or are lined and/or coated with the aluminum bronzes.