4 results about "Coal dust" patented technology

The invention belongs to the field of calcium oxide production, and concretely relates to a production raw material for preparing calcium oxide by using calcium carbide furnace gas purified ash and apreparation process thereof. The production raw material comprises calcium carbide furnace gas purified ash, calcium carbide furnace gas, coal dust, limestone and combustion air; According to the calorific values of coal dust and calcium carbide furnace gas, the weight is metered according to proportion, then the materials are separately fed into a rotary kiln nozzle in parallel through the pneumatic conveying pipelines, and the materials are injected into a rotary kiln for high temperature combustion, While heating the limestone raw material in the rotary kiln, the CaO powder in the calcium carbide furnace gas and CaO powder oxidized by CaC are sintered to lime particles, the lime particles and a calcium oxide lump material calcined by limestone are mixed, and the calcium oxide product isused as a raw material for a calcium carbide furnace device, and the impurity dust is recycled. The calcium carbide furnace gas purified ash is used as the raw material for the production of calciumoxide, and the whole process reaches clean production, saves energy, reduces costs, and improves economic benefits of the enterprise.

The invention relates to a new method for preventing coal dust explosion under a coal mine shaft. The method is characterized in that a low-pressure spray gun or sprayer is used for spraying a polyvinyl alcohol aqueous solution at a concentration of 0.5% on a working face, a conveyor belt and the places on which the coal dust is deposited; as polyvinyl alcohol is a high polymer, the atomized polyvinyl alcohol can bond and absorb the coal dust particles and the particles quickly fall onto the ground, thus effectively reducing the concentration of the coal dust in the air; and the coal dust canbe hardened and lose explosibility even if the coal dust is air-dried again, thus effectively eliminating the coal dust in the air thoroughly and preventing the coal dust explosion accident under theshaft. The new method has the following beneficial effects: the cleaning method and the water sprinkling and flushing method can be no longer used and the rock dust is unnecessary to be distributed, thus saving the manpower, materials resources and financial resources; and the coal dust in the air under the shaft is eliminated so that the lower explosion limit of gas is forced to be improved, thus indirectly reducing the gas explosion accidents.

The invention provides a novel anti-explosion door of a vertical air shaft and relates to the field of coal mine safety protection and mine ventilation system adjustment. The novel anti-explosion door comprises a door body structure and a counter weight device. The door body structure comprises a rupture disk and a steel structure. The counter weight device comprises a balancing counter weight (1) and a revolving support shaft (2). The door body structure is fixedly connected with the balancing counter weight via a steel beam. The shape of a door body can be manufactured according to actual situations. The rupture disk designed and mounted in the door body can instantly crush at limited pressure so as to depressurize to protect a main ventilator; An overturning mode of revolution of the anti-explosion door and the design of a spare shaft cover (8) meet requirements on automatic opening of the anti-explosion door when a fan stops, and the problem that disaster is enlarged due to the fact that inverted ventilation or normal ventilation cannot be performed in a short time after the anti-explosion door is destroyed by over-strong blast generated by gas explosion or coal-dust explosion is avoided.