UNDERGROUND COAL MINING: FACTORS, COST, AND …

Definition of Longwall Mining • A high extraction method of mining along the face of a predefined block of coal, referred to as a panel, while allowing the immediate roof to collapse upon advancement • Panel Configuration – Panels generally range in size from 500 to 1,000 feet in width and lengths exceeding two miles

Energy-Efficient Loading and Hauling Operations | SpringerLink

 — Approximately, 40% of the total energy used in surface mines relates to diesel consumption [].Truck haulage is responsible for a majority of this diesel consumption [].Haul trucks are used in combination with other equipment such as excavators, diggers and loaders, depending on the production capacity and site layout.

A new method of coring in coal mine: pressure-holding and …

 — The quality and cost-effectiveness of rock core samples and rapid rock coring are main issues that need to be considered in the special operations of oil and gas fields and coal mines, such as opening coal seams with gas outburst, detecting fault distance or lithologic pinch out. Soft rock coring technology has a lot of work to do to …

Coal mining | Definition, History, Types, & Facts | Britannica

 — Coal is the most abundant fossil fuel on Earth. Its predominant use has always been for producing heat energy. It was the basic energy source that fueled the Industrial Revolution of the 18th and 19th centuries, and the industrial growth of that era in turn supported the large-scale exploitation of coal deposits. Since the mid-20th century, coal …

Ventilation and Cooling in Underground Mines

 — The constant air quantity β is mainly dependent on the ore handling system and, to a certain extent, on the overall mine production rate. For mines where rock is transported through a decline using diesel powered truck haulage or there is no crushing of the mined rock, a suitable value of β is 50 m 3 /s. This typically increases to 100 m 3 /s …

Research on Speed Control Method of Mine Hoist …

The simulation results show that the optimized control algorithm can effectively improve the control efficiency, reduce the overshoot, without vibration, and can effectively improve the speed and accuracy of the mine hoist speed control. 1. Introduction At present, the hoist control system in coal mines in our country generally uses traditional PID

Recent Developments in Mine Hoists Drives1

Rheostat control or contactor control method is used for the field excitation of the motor generator set. The speed of the dc motor is directly proportional to the position of …

Design of control and frequency conversion speed

 — Design of control and frequency conversion speed regulation system for mine fan. Hong-kui Zhang 1,2, Qiu-lin Zhang 1,2, Wang Zhe 1,2, De-peng Zhang 1,2 and Ming Wang 3. Published under licence by IOP Publishing Ltd Journal of Physics: Conference Series, Volume 1653, The 2020 International Conference on Advanced Materials and …

A New index and control method of filling effect for …

 — A New index and control method of filling effect for cemented paste backfill in coal mines. ... The control method of FBR is obtained and applied to optimise the filling effect for the backfill panel in Kailuan Group in China. It is concluded that every 0.05 m reduction of the void between the filling body and roof corresponds to 1.87% increase ...

Optimal scheduling method for belt conveyor system in coal …

 — Through coordinated control of belt speed, feed rate, silo load rate and arrival time of the train, the virtual energy storage ability of silo is utilized to realize the power …

COAL HAULER

Designed and built for mining applications, Kress unitized bottom-dump coal haulers are field-proven to offer the smoothest ride, fastest transport speeds and highest payload-to …

Recent Developments in Mine Hoists Drives1

Liquid Controller for Induction motor Speed Control System. Cascade Speed Control Method [4] is used in some mines in winder drive. Here, two induction motors are coupled mechanically. First motor of the wound rotor type is connected to normal three phase supply and the second motor's stator gets supply from first one's rotor.

A review of dust control/removal methods in metal mines …

 — 2. Methods. In this review, papers published in relevant databases in the past few decades were carefully searched, for example, China National Knowledge Infrastructure (CNKI), Google Scholar, Baidu, and Web of Science [25].This review focuses on the research and development of dust control methods in metal mines in China.

Mine ultrasonic wind speed measurement system based on threshold method

The mining of coal is dangerous, and the mine tunnel ventilation system is an important component of the coal mine safety production system, so the determination of the wind speed of the mine tunnel becomes an essential task. Most of the current wind speed measurement methods can only achieve single-point measurement, which is not …

Optimal scheduling method for belt conveyor system in coal mine

 — In view of the above problems, the research on variable speed control of the BC has become a hotspot. The variable speed control is a method of adjusting the belt speed to save the power consumption of the BC [6]. Through the coordination of belt speed and feed rate, the full load operation status of the BC can be realized.

Braking in the Mine

 — ABS and traction control systems use an electronic control unit and machine sensors to monitor wheel speed and brake-line pressures. When wheel lock-up or wheel slip conditions exist, the control unit's algorithms determine what electric current is needed at the electrohydraulic control valves to improve the operator's control of the ...

Experimental investigations on the performance of a new …

 — In a variety of dust control methods for coal mines, has proved an efficient technology (NIOSH, 2003; Page ... The flow quantity of the screw pump is 0–5 m 3 /h, and the rated pressure is 0.8 MPa, with a rotation speed of 400 rpm. The working flow can be changed using its own variable frequency motor. Fig. 4 shows the ing ...

Tutorial:Mining Guide | Hypixel SkyBlock Wiki | Fandom

A minimum of 1800 ⸕ Mining Speed is required to instamine coal ore. A base 7500 ⸕ Mining Speed is needed in the Magma Fields to instamine Hard Stone while falling. HotM Tree [] The Heart of the Mountain tree used for Coal mining should have the following powder splits: Efficient Miner 60-80; Mole 71; Efficient Miner 100; Mole 190

Obstacle detection method of unmanned electric locomotive in coal mine …

DOI: 10.1117/1.JEI.31.2.023032 Corpus ID: 248313205; Obstacle detection method of unmanned electric locomotive in coal mine based on YOLOv3-4L @article{Wang2022ObstacleDM, title={Obstacle detection method of unmanned electric locomotive in coal mine based on YOLOv3-4L}, author={Wenshan Wang and Shuang …

Speed Control for DC Shunt Motor – Methods & Diagram

 — Advantages of Armature control method. This method of speed control is simple. Speed can be easily varied. Speeds below base speed or normal speed can be achieved easily. Initial cost required is low. Economical for short time speed control applications. Disadvantages of Armature control method. The operating cost increases …

1.6 FUEL HANDLING SYSTEM (COAL HANDLING)

Coal is easily handled if the lift trucks with scoop are used. In case the coal is brought by railway wagons, ships or boats, the unloading may be done by car shakes, rotary car …

Distribution law for the danger area for spontaneous coal …

This paper examines the relationship between the advancement of the working face and the distribution of spontaneous coal combustion under a low air leakage wind speed in a goaf. Based on the unsteady state simulation method, the process of spontaneous coal combustion was simulated in a fully mechanized coal mining face at different advancing …

Speed regulation strategy and algorithm for the variable …

Coordinated Speed Control Strategy for Minimizing Energy …

 — Based on the derived model, control and coordination strategies between the two speeds are proposed to minimize the shearer's energy consumption in …

Technology Roadmap for Coal Sector

2.1.1 Semi Mechanized Methods: Currently, most of CIL mines using Bord & Pillar remove coal from the face by blasting & deploy SDL or LHD for loading and transportation of coal in the active mining areas. Coal transportation to surface is either by a series of belt conveyors or rope haulage drawn coal tubs. 2.1.2. Continuous mining

Optimal scheduling method for belt conveyor system in coal mine

 — In [10], an optimal switching control strategy and an optimal variable speed control strategy for the BC are proposed and compared, where the time-of-use tariff, ramp rate of belt speed, and other system constraints are considered. The simulation results of these two strategies show that the optimal variable speed control can further reduce the ...

SHUTTLE CAR – Mining Science and Technology

 — **The method and traction is by hydraulic transmission for improved operative control during tramming. In the case of electric shuttle cars, the tramming motors give better low speed control; however, it requires a high degree of maintenance supervision *** Weight includes battery weight.

Research and development of mine high precision wind speed …

[7] Xinkun Xu 2016 Influencing factor of the accuracy of mine mechanic blade type anemometer[J] Coal and Chem ical Industry 39 136-137 +140. Google Scholar [8] Ze Jiang, Yejun Hao and Yan Liu 2012 Design of a Mine-used Air Speed Sensor Based on Pitot Tube[J] Industry and Mine Automation 38 61-63. Google Scholar

An optimized control of ventilation in coal mines based on …

According to the nonlinear and time-dependent features of the ventilation systems for coal mines,a neural network method is applied to control the ventilator for coal mines in real time.The technical processes of coal mine ventilation system are introduced.and the principle of controlling a ventilation fan is also explained in detail.The artificial neutral …

hp man riding hauler applications in coal mines

150hp man riding hauler applications in coal mines. haulers speed control method in coal mines. Colliery Equipments Used in Mines With Diagram. Jul 20 2022 · Speed Control in Haulage It has been found that the most cutter loaders embody a system of control which enables the haulage speed to adjust itself to accommodate changes in load on the ...

How to Control the Speed of DC Motors? (8 Methods) | Electrical Engineering

The maximum range of speed control of about 3 : 1 will be available depending on the load. This method of speed control is most economical for constant torque drives. This method of speed control is employed chiefly for dc series motors driving cranes, hoists, trains etc. because such drives operate on intermittent duty.

Study of energy saving of long distance tunnelling fan …

a coal mine long distance tunnelling ventilation, the energy saving benefit of the fan is analysed and compared with and without the use of a variable frequency speed control. An analysis of the

Minimum secure speed of fully mechanized coal face based …

 — The critical temperature theory of spontaneous combustion of coal and the numerical simulation method are used to explore the minimum secure speed of fully mechanized coal face to prevent the spontaneous combustion in goaf. Combined with the actual situation of workface 31005 in a coal mine, the highest temperatures in goaf at …

Unmanned Driving Technology in Coal Mine Based on

Date of publication xxxx 00, 0000, date of current version xxxx 00, 0000. Digital Object Identifier 10.1109/JOURNAL.2017.Doi Number Unmanned Driving Technology in Coal Mine

Research on a Speed Guidance Strategy for Mine Vehicles in …

 — Aiming at the traffic congestion problem of mining vehicles in the intersection area of three-fork roadways in coal mines, this paper proposes a speed guidance strategy based on a vehicle–road cooperative environment to adjust the running state of mining …