CN201740717U - Desorbing character test tank for water injection coal sample under pressure condition - Google Patents

Abstract

The utility model discloses a desorbing character test tank for a water injection coal sample under a pressure condition, comprising an upper flange disc, an oil pressure connecting pipe, an oil pressure piston, a fastening nut, a double-end bolt, a water injection pipe, a tank body, a lower support screw, a lower flange disc, an air inlet pipe and an air outlet pipe, wherein the upper flange disc is fixed on the upper part of the tank body through the fastening nut and the double-end bolt; the lower flange disc is fixed on the lower part of the tank body through the lower support screw; the upper part in the tank body is provided with the oil pressure piston; a hydraulic cavity is formed between the upper end of the oil pressure piston and the upper flange disc; one side of the hydraulic cavity is provided with the oil pressure connecting pipe; the center of the lower flange disc is vertically fixed with the water injection pipe; and the air inlet pipe and air outlet pipe are respectively fixed beside the water injection pipe. The desorbing character test tank is featured with reliable performance, is flexible and convenient, and can more accurately simulate the desorbing character of the testing coal to the gas.

Description

Experimental tank for desorption characteristics of water-injected coal samples under overburden pressure

Technical field:

The utility model belongs to the technical field of coal mine gas prevention and control, in particular to an experimental tank for the desorption characteristics of water-injected coal samples under the condition of covering pressure.

Background technique:

The isothermal desorption experiment of coal to gas is an important work in the field of coal mine gas prevention and control technology. The traditional experimental method is to use granular coal instead of raw coal for experiments. However, since the buried depth of the coal seam can reach more than one thousand meters, the overburden pressure has a great influence on the pore characteristics and permeability of the coal seam due to the gravity of the overlying rock stratum. Especially in the field of research on the influence of coal seam water injection on gas desorption, the liquid water in the coal body will have an inhibitory desorption effect on gas, and this inhibitory effect has a lot to do with the force between the pores of the coal body and the water , at this time, the pressure of the overlying strata is a factor that must be considered when studying the desorption characteristics of coal gas. At present, the method of putting coal samples between large rock presses is used for experiments, but due to the limitations of experimental conditions, the requirements of constant temperature of experimental coal samples and the requirements of sealing, it is difficult to popularize and apply; on the other hand, It cannot meet the extensive development of experimental research on the desorption characteristics of water-injected coal samples under overburden pressure conditions.

Utility model content:

The purpose of the utility model is to overcome the above-mentioned defects and provide a reliable, flexible and convenient test tank for the desorption characteristics of water-injected coal samples under pressure-covered conditions.

In order to achieve the above purpose, the utility model includes: an upper flange, an oil pressure connecting pipe, an oil pressure piston, a fastening nut, a stud bolt, a water injection pipe, a tank body, a lower support screw, a lower flange, an air intake pipe , Air outlet pipe, use fastening nuts and stud bolts to fix the upper flange on the upper part of the tank body, use the lower support screws to fix the lower flange on the lower part of the tank body, and set an oil pressure piston on the upper part of the tank body. A hydraulic chamber is formed between the upper end of the piston and the upper flange, and an oil pressure connection pipe is arranged on one side of the hydraulic chamber, and a water injection pipe is vertically fixed in the center of the lower flange, and an air inlet pipe and an air outlet pipe are fixedly arranged beside the water injection pipe. .

In order to ensure the sealing performance of the hydraulic piston and prevent the surface of the hydraulic piston from being scratched, the external part of the hydraulic piston is covered with a dust-proof sealing ring.

In order to ensure the sealing performance of the upper flange, the lower flange and the tank body, O-rings are respectively arranged between the upper flange and the tank and between the lower flange and the tank.

Like this, when utilizing the utility model to do experiment, open fastening nut, make upper flange plate and tank body separate, add experimental coal sample into tank body, clean up O-shaped sealing ring and its contact part, cover upper flange Tighten the fastening nuts at both ends of the stud bolts, connect the high-pressure hose of the manual hydraulic pump to the oil pressure connecting pipe, connect the desorption test pipeline to the air inlet pipe and air outlet pipe, and connect the high-pressure water injection pump to the water injection pipe. Various desorption experiments of coal to gas under pressure conditions. The performance of the equipment is reliable, convenient and flexible, and it can simulate and test the desorption characteristics of coal to gas more accurately. The tank can be reused, which provides a more convenient experimental device for the high-pressure desorption experiment of coal to gas under the condition of overburden pressure.

Description of drawings:

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Fig. 1 is a schematic cross-sectional structure diagram of the utility model.

Label names in the figure: 1-upper flange; 2-hydraulic chamber; 3-oil pressure connecting pipe; 4-oil pressure piston; 5-fastening nut; 6-dust-proof sealing ring; 7-O-type sealing ring; 8-stud bolt; 9-spring washer; 10-flat washer; 11-experimental coal sample; 12-water injection pipe; 13-tank; 14-lower support screw; 15-lower flange; ; 17-sealing device I; 18-sealing device II; 19-intake pipe; 20-outlet pipe.

Detailed ways:

As can be seen from Figure 1, the utility model includes: an upper flange 1, an oil pressure connecting pipe 3, an oil pressure piston 4, a fastening nut 5, a stud bolt 8, a water injection pipe 12, a tank body 13, and a lower support screw 14 , Lower flange 15, air intake pipe 19, air outlet pipe 20. The upper flange 1 is fixed on the top of the tank body 13 by fastening nuts 5 and stud bolts 8, and spring washers 9 and flat washers 10 are set on the stud bolts 8 to ensure the firmness and reliability of the fastening nuts. The lower flange 15 is fixed on the lower part of the tank body 13 by using the lower support screw 14, and the oil pressure piston 4 is arranged on the upper part of the tank body, and the outer part of the oil pressure piston is covered with a dustproof sealing ring 6, and the upper end of the oil pressure piston 4 is connected to the upper flange. A hydraulic chamber 2 is formed between the disks 1, and an oil pressure connecting pipe 3 is arranged on one side of the hydraulic chamber for injecting high-pressure hydraulic oil. The oil pressure piston is closely matched with the inner wall of the tank, and the working medium is special hydraulic oil. The space formed by the lower end of the oil pressure piston 4 and the lower flange 15 is used to place the test coal sample 11, and transmit pressure to the test coal sample through the oil pressure piston. A water injection pipe 12 is fixed vertically at the center of the lower flange 15, and an air inlet pipe 19 and an air outlet pipe 20 are respectively fixedly arranged beside the water injection pipe, which are respectively used as the air inlet and air outlet of the experimental tank, and the upper part of the air outlet pipe is connected to the measuring air chamber 16, to avoid pipeline blockage. Sealing device I 17 is set around the inlet pipe 19, and sealing device II 18 is set around the outlet pipe 20 to ensure the sealing performance of the inlet pipe, the outlet pipe and the lower flange. In order to ensure the sealing performance of the upper flange, the lower flange and the tank body, O-rings 7 are respectively arranged between the upper flange and the tank and between the lower flange and the tank. The specifications and sizes of the utility model can be made into series products as required.

Claims (3)

1. one kind covers water filling coal sample desorption properties experimental tank under the press strip spare, comprise: upper flange plate (1), oil pressure connecting pipe (3), hydraulic piston (4), clamp nut (5), stud bolt (8), water injection pipe (12), tank body (13), lower support screw (14), lower flange (15), draft tube (19), escape pipe (20), it is characterized in that utilizing clamp nut (5) and stud bolt (8) that upper flange plate (1) is fixed on tank body (13) top, utilize lower support screw (15) that lower flange is fixed on the tank body bottom, be provided with hydraulic piston (4) at tank body (13) internal upper part, form hydraulic cavities (2) between hydraulic piston upper end and the upper flange plate, hydraulic cavities one side is provided with oil pressure connecting pipe (3), vertically be set with water injection pipe (12) at the lower flange center, be set with draft tube (19) and escape pipe (20) respectively on the water injection pipe next door.

2. according to claim 1ly cover water filling coal sample desorption properties experimental tank under the press strip spare, hydraulic piston (4) outside under it is characterized in that is with dust-proof seal ring (6).

3. according to claim 1ly cover water filling coal sample desorption properties experimental tank under the press strip spare, it is characterized in that being respectively arranged with O RunddichtringO (7) between upper flange plate and the tank body and between lower flange and the tank body.