CN104179657A - Passive pneumatic pressurizing device for underground coal mine - Google Patents

Abstract

The invention discloses a passive pneumatic supercharging device under a coal mine, which belongs to the technical field of pneumatic supercharging. The device includes an air motor, a compressor, an air storage tank and a pneumatic control valve group. The air motor and compressor are respectively connected to the downhole compressed air system, and the air motor, compressor, air storage tank and the underground pneumatic equipment are connected in sequence. The valve group is arranged between the air motor and the compressor. The device uses the underground air pressure system and adopts passive drive to convert the medium-low pressure and high-flow gas in the pipeline into the pressure required by the underground pneumatic equipment. It can completely replace the underground electric equipment, eliminate potential safety hazards, and improve the working efficiency of coal mine pneumatic equipment. , expand the scope of application of pneumatic equipment in coal mines, reduce production costs, ensure safe production in coal mines, and have good economic and social benefits.

Description

A passive pneumatic booster device for underground coal mines

technical field

The invention relates to a passive pneumatic supercharging device under a coal mine, belonging to the technical field of pneumatic supercharging.

Background technique

With the continuous extension of underground tunnels in coal mines, the pressure of the compressed air pipeline is gradually reduced. Insufficient air pressure causes the work efficiency of underground pneumatic equipment to be greatly reduced, and the reconstruction of the compressed air pipeline needs to invest millions or even tens of millions of funds. Compression equipment will cause underground safety hazards. According to the requirements of the "Notice on the Safety Management of Air Compressors Used in Coal Mine" (Anjian Zongmeizhuang [2011] No. 195), mobile air compressors cannot be placed on the mining face and the same In the roadway of the mining face, the use of pipeline connection will inevitably lead to too long pipeline and excessive pressure loss.

At present, in the field of downhole gas booster devices at home and abroad, active booster devices are basically used, and all of them are small flow (<1.0m3/min), which cannot meet the current booster needs; and passive pneumatic devices Supercharging devices are still blank at home and abroad and need to be developed.

Contents of the invention

The purpose of the present invention is to provide a new passive pneumatic booster device that can improve the working efficiency of mine pneumatic equipment and expand the application range of pneumatic equipment in coal mines, which can replace the traditional underground active booster device.

The present invention adopts following technical scheme:

A passive pneumatic pressurization device for underground coal mines, including an air motor, a compressor, an air storage tank, and a pneumatic control valve group, wherein the air motor and the compressor are respectively connected to the underground air pressure system through air pressure pipelines, and the air pressure in the underground The gas in the system must be filtered before entering the air motor and compressor; the air motor is connected with the compressor, gas storage tank and downhole pneumatic equipment in sequence, and the compressor converts the low-pressure and large-flow gas in the compressed air pipeline into Medium-pressure and medium-flow gas or high-pressure and small-flow gas to meet the gas requirements of downhole pneumatic equipment; the pneumatic control valve group is set between the air motor and the exhaust pipe of the compressor; the gas storage tank is used to store high-pressure gas , to keep the gas consumption of downhole pneumatic equipment stable.

The ^air motor is used to drive the compressor, its working pressure range is 0.3-0.6MPa, and its air consumption is 4.0-5.0m ³ /min; Min gas is converted into gas with pressure ≥ 0.5MPa and flow rate ≥ 1.5m ³ /min.

The structure of the compressor adopts a piston type or a screw type, and its boosting ratio is 1-2 times.

Further, a safety valve is also provided on the gas storage tank.

The underground passive pneumatic booster device of the present invention utilizes the underground compressed air system and adopts passive drive to convert the medium-low pressure and high-flow gas in the pipeline into the pressure required by the underground pneumatic equipment, which can completely replace the underground electric equipment and eliminate the need for safety. Hidden dangers, improve the working efficiency of coal mine pneumatic equipment, expand the application range of pneumatic equipment in coal mines, reduce production costs, ensure safe production in coal mines, and have good economic and social benefits.

Description of drawings

Fig. 1 is a schematic diagram of a passive pneumatic booster device in a coal mine of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, the passive pneumatic booster device in the coal mine is mainly composed of an air motor, a compressor, a pneumatic control valve group, an air storage tank and pipeline accessories. Air system connection, air motor, compressor, air storage tank and downhole pneumatic equipment are connected in sequence. The air motor is used to drive the operation of the compressor. Its working pressure is 0.3-0.6 MPa and its air consumption is 4.0-5.0 m ³ / min, able to work normally under the pressure of 0.3 MPa, its output power: ≥7.0 kW. The gas entering the air motor and compressor must be filtered to keep it clean and clean.

The compressor is the core part of the pneumatic booster device. It is the key equipment to convert the low-pressure and high-flow gas into the pressure required by the downhole pneumatic equipment. The structure of the compressor can be piston or screw. The port can withstand 0.3-0.5Mpa, not less than 5.0 m ³ /min flow pressure of gas, shaft power ≥ 5 kW, exhaust temperature ≤ 120 ℃; exhaust volume ≥ 2.2 m3/min; boost ratio 1-2 times .

The pneumatic control valve group is set between the air motor and the compressor. On the one hand, the pneumatic control valve group is used to control the pressure and speed of the air motor, and on the other hand, it is used to control the pressure of the exhaust pipe of the compressor to ensure that the compressor is in the most optimal position. It is in the best working condition, and has functions such as over-temperature and over-pressure protection.

The gas storage tank is used to store a certain high-pressure gas. It is equipped with a pressure release device to keep the gas consumption of the pneumatic equipment stable and ensure the stable and reliable operation of the pneumatic equipment. The gas storage tank is equipped with a safety valve.

The present invention can use the energy of the underground compressed air system to drive the underground pneumatic equipment to work through the pneumatic booster device. Low-pressure, high-flow gas is converted into medium-pressure, medium-flow or high-pressure, low-flow gas to meet the working requirements of pneumatic equipment in the underground mining face without external power. According to the law of energy conservation, the energy of the system is shown in the following formula: E ₀ =E ₁ +E ₂ , where: E ₀ =P ₀ V ₀ , pressure energy before pipeline pressurization; E ₁ =P ₁ V ₁ , pneumatic The pressurization device consumes pressure energy; E ₂ =P ₂ V ₂ , the pressure energy after the pipeline is pressurized.

Claims (4)

1. A passive pneumatic pressure booster in underground coal mines, comprising an air motor, a compressor, an air storage tank and a pneumatic control valve group, characterized in that the air motor and the compressor are respectively connected to the underground air pressure system through an air pressure pipeline , the gas in the downhole compressed air system must be filtered before entering the air motor and compressor; The flow gas is converted into medium pressure and medium flow gas or high pressure and small flow gas to meet the gas requirements of downhole pneumatic equipment; the pneumatic control valve group is arranged between the air motor and the exhaust pipe of the compressor; the gas storage tank is used To store high-pressure gas, a pressure release device is installed to keep the gas consumption of downhole pneumatic equipment stable. 2. A passive pneumatic booster device for coal mines according to claim 1, characterized in that the air motor is used to drive the compressor to run, its working pressure range is 0.3-0.6MPa, and its air consumption is 4.0- 5.0m ³ /min; the compressor converts gas with a pressure of 0.3-0.4MPa and a flow rate of ≥5.0m ³ /min into a gas with a pressure of ≥0.5MPa and a flow rate of ≥1.5m ³ /min. 3. A passive pneumatic pressure booster for underground coal mines according to claim 2, characterized in that the structure of the compressor is a piston type or a screw type, and its boosting ratio is 1-2 times. 4. A passive pneumatic pressure booster for underground coal mines according to any one of claims 1 to 3, characterized in that a safety valve is also provided on the gas storage tank.