Test device for liquid nitrogen temperature transfer in coal sample and test method
A testing device and liquid nitrogen technology, applied in coal mines and petroleum fields, can solve problems such as uncontrollable pressure and irregular gas release, and achieve the effect of ensuring increased pressure
Pending Publication Date: 2019-02-05
HENAN POLYTECHNIC UNIV
View PDF0 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The temperature change law of coal rock samples has an important influence on the fracture development of coal rocks, and is of great significance to setting the process parameters such as the distance between injection points of liquid nitrogen. Technology of Coal Rock Temperature Variation Law
[0006] 2. In the existing liquid nitrogen anti-reflection technology, a large amount of liquid nitrogen is gasified at the contact surface with coal rock, and the gasified gas is released irregularly, and the pressure generated by liquid nitrogen gasification cannot be controlled
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0059] like Figure 1 to Figure 6 As shown, the coal sample liquid nitrogen temperature transfer testing device of the present invention includes a contact chamber 1, a liquid nitrogen tank 2 and a multi-channel data acquisition instrument 3, and the multi-channel data acquisition instrument 3 is connected with a computing device 4 through a connecting line 18;
[0060] The liquid nitrogen tank 2 includes a tank body 5, the inner wall of the tank body 5 is provided with an insulating layer 6, and the top of the tank body 5 is provided with a box cover 7 at intervals. Directional valve 8 and first safety valve 9;
[0061] The contact chamber 1 is provided with a central hole 10 with an open top, and the top of the central hole 10 is threadedly connected with a bolt 11 for closing the central hole 10; the bottom of the contact chamber 1 is provided with a liquid nitrogen tank 12, and the liquid nitrogen tank 12 is located in the central hole 10 The bottom is connected to the ce...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| Diameter | aaaaa | aaaaa |
| Diameter | aaaaa | aaaaa |
Login to View More
Abstract
The invention discloses a test device for liquid nitrogen temperature transfer in a coal sample. The device includes a contact chamber, a liquid nitrogen box and a multi-channel data collection instrument. The multi-channel data collection instrument is connected with a calculation device. A bolt is connected with the top of a center hole of the contact chamber in a threaded manner. A liquid nitrogen slot is arranged at the bottom of the contact chamber. A coal rock test sample is mounted in the central hole between the bolt and a support step. A thermocouple is mounted in a mounting hole at the top of the coal rock test sample. A thermocouple is connected between a heat-insulation layer directly facing each horizontal channel and the coal rock test sample. The liquid nitrogen slot is connected with a nitrogen inlet pipe and a nitrogen outlet pipe. The nitrogen inlet pipe is connected with the liquid nitrogen box. The nitrogen outlet pipe is connected with a three-way valve. The three-way valve is connected with a second safety valve and a pressure relief valve. The invention also discloses a test method carried out by using the above test device. According to the device and the method, pressure generated in liquid nitrogen gasification can be stabilized, temperature change laws at different positions in the coal rock test sample after contact of liquid nitrogen with the coal rock test sample can be studied, and a foundation can be provided for obtaining best anti-reflection technology parameters for coal rock test samples of specific mine areas.
Description
technical field [0001] The invention relates to the field of coal mine and petroleum technology, in particular to the anti-permeability technology of coal seam or rock formation. Background technique [0002] Coal and oil are two fossil energy sources that were essential to the proper functioning of pre-society. During the mining of coal and oil, it is often necessary to enhance the permeability of coal seams or rock formations. Permeability enhancement refers to the use of certain technical means to develop cracks in coal seams or rock formations. For example, after the cracks in the coal seam increase, become longer and larger, it provides technical support for the effective extraction of gas in it. In the present invention, the term "coal rock sample" refers to a coal seam sample taken from a coal seam or a rock formation sample taken from a rock formation. [0003] The technical means of anti-reflection include drilling or caving for anti-reflection, drilling or cavin...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): G01K7/02G01K13/02
CPCG01K7/02
Inventor 李波张路路魏建平任永婕姜婉王泽祺
Owner HENAN POLYTECHNIC UNIV