Carbon dioxide fracturing is widely used in foreign countries for boiler block, building demolition blasting, special area etc., was deemed safe in countries such as Britain, New Zealand, is an international advanced idea and method of safe and effective blasting technology. On the one hand, to meet the general demand of mine blasting, on the other hand, is also an effective and safe coal seam gas drainage technology and equipment. So the carbon dioxide fracturing device is a new type of comprehensive technical equipment =, because it is a physical and technical advantages of other blasting technology and equipment can not be compared, for our country to the coal mine gas control, gas drainage and mining under the special conditions of mining provide new technology, new technology, and promote the healthy the security and development of China's coal industry.
1, the technical characteristics of carbon dioxide fracturing is affected by heat expansion using liquid carbon dioxide, rapid release of high pressure gas or coal rock breaking, solves withblastingmining and pre splitting in destructive, high risk of ore mining safety shortcomings for crushing and pre splitting and provide a reliable guarantee, and widely used coal and non coal mines. Liquid carbon dioxide fracturing device is the use of liquid carbon dioxide is heated rapidly gasification expansion and release sufficient energy caused by blasting, rock or coal fracture, to replace the traditional coal mining or deep hole presplitting blasting in detonator.
Has the following advantages:
(1) the unique design of the carbon dioxide cracking device, the work will not produce any open flame or spark;
(2) carbon dioxide fracturing device belongs to the low temperature cracking, low temperature carbon dioxide carbon dioxide gas after blasting cracking temperature surface and produce a large number of high pressure gas environment, coupled with a carbon dioxide gas can create an inert, eliminate the possibility of gas explosion in nature;
(3) carbon dioxide fracturing blasting is powerful, throwing coal quantity, block, throw a short distance, reduce the labor intensity of the workers, and will not cause the collapse blasting accident;
(4) carbon dioxide fracturing device after blasting, coal powder ratio decreased significantly, no dust, coal dust explosion hazard is greatly reduced;
(5) the ability to control carbon dioxide blasting fracturing device, through the selection of different energy release tablets, carbon dioxide and filling weight of the heating pipe control fracturing is the working pressure;
(6) the carbon dioxide cracking device has no gun smoke, does not produce carbon monoxide and nitrogen oxides and other toxic gases, can better improve the working environment, and is beneficial to the health of miners;
(7) carbon dioxide can be repeated use of a single input. The structure and performance of the equipment are tested, improved and optimized by thousands of times, and the fault is low, the reliability is high, and the applicability is strong;
(8) carbon dioxide fracturing is the core material - anaerobic pressure controlled heating agent, is a special material and configuration optimization, cannot ignite or detonate in the air, must put the heating device placed in the special environment, also can prevent the collision or falling caused by burning or explosion.
2, carbon dioxide fracturing device applications according to the technical characteristics of carbon dioxide fracturing device, it is not suitable for explosive blasting is widely used in the field of coal mine, coal mine, open pit and underground explosive areas, and can replace explosives as a source for Megatron detection in the field of mine; can be used for deep presput blasting through coal (rock) tunneling working face, coal, gas, coal and gas production, strengthen the prevention and control of coal seam blasting dust, forced caving, coal block, roadway repair (heave) etc..
3, technology has formed carbon dioxide enhanced coalbed methane drainage technology, carbon dioxide carbon dioxide Fracturing Comprehensive Gas Prevention and control technology, fracturing device working face excavation technology, carbon dioxide fracturing for enhanced dust technology, carbon dioxide fracturing is forced to put coal seam top technology, carbon dioxide fracturing for dredging technology, carbon dioxide fracturing is broken remove the carbon dioxide fracturing technology and device of fire prevention and control technology etc..
4, application effect
1) in soft and outburst to carry out deep presput blasting through technology application in coal seam, the results show that the effect of carbon dioxide fracturing device after blasting borehole gas emission is greatly improved (20~40 times), coal seam permeability coefficient is greatly improved (17~22 times), drilling natural gas emission to reduce 70~80%, improve drainage 8~12 times the radius of influence of mining attenuation coefficient.
2. The application of coal falling in coal roadway is indicated:
(1) carbon dioxide fracturing blasting device in power, can achieve explosive coal blasting and blasting effect, the ability to control, through the selection of different energy release tablets, carbon dioxide and filling weight of the heating pipe control; also with coal throwing quantity, large blocks, thrown into a short distance, block rate of more than 60%, Stoker the distance 2~3m.
(2) additional equipment needs less use of carbon dioxide to the cracking device for driving down the coal test, in addition to the need to match the cause of the crack and the impact drill bit outside, basically no other additional equipment requirements.
(3) the number of blasting holes is less in the face section 10m2, for example, the use of traditional explosive blasting need to blast hole 30~40; and the use of carbon dioxide to the crack device only 8~10 a hole, reduce the amount of about 70% of the drilling.
(4) less traditional blasting harmful gases will produce harmful gases carbon dioxide and carbon monoxide, generally after blasting working face of carbon dioxide or carbon monoxide and carbon dioxide are often overrun; carbon dioxide and carbon monoxide induced crack is full section blasting gas less, has never been beyond the limit, and the limit values have a larger space for safety. (5) other harmful effects of small carbon dioxide cracking device not only will not produce shock waves, but also will not produce large blasting noise and dust. Due to the production of toxic and harmful gas less, no shock and sound, can create a good environment for the underground blasting, is conducive to the work of the health of workers and physical and mental health