Movable degassing unit
Movable degassing unit (MDU) is designed for drawing-out air-gas mixture from the coal mine working. Energy X Components offers the solution of degassing problem on the worked-off sections using compact modern degassing units on the basis of liquid-packed ring pumps or dry rotary pumps.
Use of MDU allows:
- concentration reduce of methane escaping from coal beds and rocks into the mine working;
- completely stop or significantly reduce standby time of production units caused by gas content;
- use electricity in mines instead of less effective pneumatic energy;
- increase efficiency of workers labour and safety of mining works in gas mines;
- prevent or reduce intensity of non-standard gas shows – blowers, instantaneous outburst of coal and gas, etc.
Composition of MDU
Constructively movable degassing unit consists of some (2-3) modular buildings comprising pump equipment, power supply equipment, operator’s room and control equipment.
Modular buildings are dismountable; consist of separate sections, installed on the concrete basement or on the extra stable metal construction. Each modular building has its own heating and lighting systems. Mounting of the buildings takes some hours.
Material Mining Electric Equipment
Composition of MDU can be changed in accordance with different order requirements. Its basic functional elements are the following:
- temperature sensor;
- pressure sensor;
- fire-stop units;
- frequency drive;
- automated control system;
- supply equipment.
In case liquid-packed ring pumps are installed, it is also necessary to install the following equipment:
- water separators;
- accumulating, gathering and reserve water tanks.
Automated control system (ACS)
MDU operates in automatic mode. During unit’s operation, constant fixation of basic technological parameters takes place:
- methane concentration in methane-air mixture (MAM);
- methane concentration in modular buildings;
- temperature of MAM;
- instant flow of MAM;
- exhaustion caused by pumps;
- exhaust pressure and temperature of MAM;
- pump data (vibration, temperature of bearings, etc.);
- temperature outside and inside the building.
All the parameters are immediately sent to the operator’s control console and via digital communication channels to the mining dispatcher.
Moreover, ACS constantly controls mixture composition and operates frequency transformers. It allows maintaining non-explosive methane concentration. Unit operation can be carried out in a local mode (by the operator), as well as in a remote mode (by the dispatcher).
Methane-air mixture (MAM) via degassing pipeline is led to the degassing unit. Through the gate valve, intake fire-stop units and fast-acting isolating valve mixture is led to the rotary pumps. Also in this section control over temperature, pressure, flow and composition of MAM is carried out.
Before the fire-stop units, MAM goes through the system of screen filters, which allow reducing of mixture moisture content and coal dust filtering. Construction of filters does not contain changeable sections – screen filters are easily cleaned during 2 minutes, after that they are suitable for the further operation. Rotary pumps used for gas-air mixture pumping do not need any special service and provide long-lasting service-life of MDU. Rotary pumps are operated with the help of frequency transformers which allow keeping methane concentration not less than 20% (explosive concentration is 5-15%). After the pumps, MAM also goes through the temperature and pressure control and through the gate valves, fire-stop units of discharge head and fast-acting isolating valves is led to the exit. Rooms of the degassing units are equipped with the system of automatic control over the composition of the air mixture and ventilation.
Liquid-packed ring pumps used for pumping of gas-air mixture require the constant water level. For these purposes construction of the unit provides a water tank located outside the building (tank filling is 3 m3 per day), as well as tank accumulator and boost pump 1B-20 located inside the building. Pumps are controlled with the help of the frequency transformers which allow keeping methane concentration not less than 20% (explosive concentration is 5-15%). After the pump, MAM goes into water separator where condensate precipitates onto the walls and via the additional pipeline goes to the accumulator. After that MAM also goes through the temperature and pressure control and through the gate valves is led to the exit.