Dry ice blasting method and dry ice blasting device

Abstract

The invention relates to a dry ice blasting method and a dry ice blasting device, and belongs to the field of engineering blasting. The dry ice blasting device comprises a spray head, a cylinder body, a tail cover and a one-way valve, wherein the spray head is provided with an exhaust hole; the tail cover is provided with a water inlet hole; a sealing gasket is arranged between the cylinder body and the tail cover; a blasting sheet is arranged between the cylinder body and the spray head; and the tail cover is communicated with the one-way valve through the water inlet hole. The dry ice blasting method comprises the following steps: drilling in a coal bed; assembling the dry ice blasting device, and filling the dry ice blasting device with dry ice and a heating bag; connecting the dry ice blasting device with a water pipe, and placing into a blast hole; and communicating with a water source, and injecting water into the dry ice blasting device, wherein the heating bag inside the cylinder body fast releases heat when encountering water so as to urge the dry ice to be fast sublimated into carbon dioxide gas, when gas pressure exceeds the design pressure of the blasting sheet, the instant blasting of the blasting sheet is caused, and the carbon dioxide gas is fast discharged through the exhaust hole formed in the spray head to form impaction and expansion extrusion on the wall of the blast hole, so that the blasting is realized. The dry ice blasting method and the dry ice blasting device which are disclosed by the invention have the advantages of achieving the bursting at normal temperature, generating no flame or toxic gas and being suitable for a coal mine with gas and coal dust explosion risks.

Description

technical field [0001] The invention relates to a blasting method and device, in particular to a dry ice blasting method and device. Background technique [0002] The explosion of explosives is a process of high temperature and high pressure. The temperature of the explosion product can reach thousands of degrees, and the pressure can reach thousands or even tens of thousands of megapascals, which can cause damage to the surrounding medium and cause strong vibration. [0003] In coal mine production, many major accidents such as gas explosions and coal and gas outbursts are caused by blasting operations. For example, in 2005, Qitai Dongfeng Coal Mine in Heilongjiang Province used loosening blasting to deal with blockage of coal bunkers, causing a gas explosion, killing 171 people; The gas outburst accident killed 30 people and injured 77. In these accidents, the high-temperature and high-pressure properties of explosive explosions and strong vibration characteristics are t...

AI Technical Summary

Problems solved by technology

For example, in 2005, Qitai Dongfeng Coal Mine in Heilongjiang Province used loosening blasting to deal with blockage of coal bunkers, causing a gas explosion, killing 171 people; Gas outburst accident kills 30, injures 77

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