3results about How to "Less gush" patented technology

The present application relates to the technical field of gas outburst chemical agent, in particular to a kind of methane esterification agent for preventing gas outburst and its preparation method and application method, and the methane esterification agent includes acid, I2, manganese-containing oxidizing agent and iron catalyst, relative to acid, the amount of I2 is 0.035-0.040 mol / L, the amount of manganese-containing oxidizing agent is 0.15-0.2 mol / L, and the amount of iron catalyst is 0.1-0.2 g / 100 mL;The iron catalyst is Fe-loaded MWCNTs, and the iron loading in the iron catalyst is 36-53% of the amount of MWCNTs in terms of mass content.The methane esterification agent of the present application can effectively esterify methane, and the formula and preparation method are simple and easy to operate, and the methane esterification agent has small corrosion hazard effect.

This invention proposes a variable diameter measuring device for positive pressure flue gas ducts, comprising an upper mounting plate, a sliding plate, and a lower mounting plate. The lower mounting plate is connected to the flue gas duct and has a first through hole in its center. After the lower mounting plate is connected to the flue gas duct, the first through hole corresponds to the position of the measuring hole on the flue gas duct. The upper mounting plate has a second through hole in its center, which is coaxial with the first through hole. The upper mounting plate is fixed to the side of the lower mounting plate away from the flue gas duct. The sliding plate is located between the upper and lower mounting plates, and its two sides are slidably connected to the upper and lower mounting plates, respectively. There are multiple sliding plates arranged circumferentially. The ends of the sliding plates near the measuring hole form mounting holes. When the sliding plates move away from the measuring hole, the mounting holes open; when the sliding plates move closer to the measuring hole, the mounting holes close. This invention realizes the variable diameter opening and closing of the measuring hole, improving the convenience and safety of the testing equipment placement.

The present application relates to the technical field of coal mining, and provides a coal mine resource collaborative mining and full-space destruction control method for surrounding rock in a mining area, comprising the following steps: determining the horizon of a low-position thick hard basic roof rock layer based on the structural parameters of a coal seam roof; determining the arrangement position and parameters of a fracturing borehole based on the horizon of the low-position thick hard basic roof rock layer; performing fracturing borehole construction, with the horizontal section of the fracturing borehole being located in the low-position thick hard basic roof rock layer and covering the entire length of the mining face in the strike direction; performing fracturing construction in the horizontal section to form fracturing cracks and controlling the development of the fracturing cracks to make the fracturing cracks penetrate the coal seam in the vertical direction; and after the fracturing construction is completed, extracting gas through the fracturing borehole. In this way, by using the fracturing of the low-position thick hard basic roof rock layer, the coal seam gas resource recovery, gas disaster control, coal mine roof / floor water disaster prevention and control, and surrounding rock control in the mining and excavation space can be simultaneously achieved, the disaster prevention and control engineering quantity is greatly reduced, the engineering cost is reduced, and the construction period is shortened.