Second, the scope of ordinary skill and technical application: Suitable for surface and underground coal mine gas and coal dust explosion hazard environment, but also for coal, metallurgy, chemicals, building materials, food, transportation and other environmental, belt conveyor for sequence control, monitoring Belt protection and multi-motor drive power balance.
3. Energy consumption and carbon emissions related to the technology
In the production of large and medium-sized coal mining enterprises, it is necessary to use a large number of belt conveyors (hereinafter referred to as belt conveyors) to complete the transportation of coal. The traditional transportation control method is to control the start and stop sequence of each belt conveyor through the central controller PLC through the frequency converter. When the belt conveyor reaches the rated belt speed, the frequency converter will lose the control effect on the motor, and the belt conveyor will follow the design belt speed. Speed ​​operation, resulting in waste of electrical energy under no-load, light-load conditions, etc.
At present, the large-scale mining group's total electricity consumption per ton of coal production is about 40kWh (up to 80kWh), and the coal-consuming power consumption is about 8kWh/t. The small and medium-sized mining group is limited by resource conditions and production equipment, and the energy consumption is higher.
At present, the technology can achieve energy saving of 80,000 tce / a, CO2 emission reduction of about 210,000 t / a.
Fourth, technical content
1. Technical principle
The belt variable frequency energy efficiency system installs the flow sensor on the belt conveyor, intelligently detects and calculates the condition of transporting coal on the tape through the PLC network system, and cooperates with the frequency converter to realize the energy-saving operation of the belt conveyor and minimize the belt conveyor. The power loss increases the overall operating efficiency of the belt conveyor. The energy efficiency system is an electronic control system integrating protection and energy saving control. The control system, protection system, communication system and video monitoring system are combined to form a complete operation, scheduling, protection and monitoring network. The power balance technology ensures that the output of multiple motors is consistent, and the optimal operation control of the entire transportation system is realized.
2. Key technologies
(1) Intelligent detection and calculation of PLC network system, remote control, telemetry, remote signaling and remote adjustment of the entire transportation system;
(2) Frequency conversion multi-machine drag power balance and multiple belt co-operation;
(3) A number of belts from the ground to the well and long-distance coordinated linkages can realize “more rapid coal rotation, slower coal rotationâ€, “starting coal flowâ€, “with coal driving, no coal parkingâ€.
3. Process
The process flow is shown in the figure below.
V. Main technical indicators
1. With overload capacity, can maintain 1 minute at 150% rated output;
2. When the inverter runs at zero speed, the starting torque of the frequency conversion is greater than 1.5 times the rated torque;
3. A power factor of 0.95 is reached or exceeded within a load variation of 20-100%, and the current harmonics are small, no power factor compensation/harmonic suppression device is required;
4. Built-in power balance adjustment, can form a closed-loop control system with various types of transmitters;
5. The inverter can adopt local starting and stopping control mode, or remote control by PLC or other external equipment; through communication (RS485, Modbus, Profibus), 32 inverters can be controlled at the same time. .
6. Technical appraisal, award status and application status
At present, the frequency converter has been widely used in the coal mining industry, especially in the main fan, the local fan, the hoist, the pressure fan, the slurry pump and other loads, the energy saving effect is remarkable. However, in the field of belt conveyors, the combination of variable frequency speed regulation, information technology and automation technology, and finally the technology of low energy consumption of belt conveyors, has not been widely applied. Based on the advanced technology of foreign countries, the belt machine frequency conversion energy efficiency system integrates the technology in related fields and develops a belt conveyor system with high degree of automation, safety and reliability, which can be widely used in many fields such as coal, metallurgy, electric power, chemical industry and building materials. , has greater energy saving potential.
Seven, typical application case
Typical Case 1: Shaanxi Cuijiagou Coal Mine Project
Technology Provided by: China Coal Science and Technology Energy Saving Technology Co., Ltd.
Construction scale: 2 million tons of production capacity. The main technical reform content: main transport belt (one) energy efficiency optimization. The main equipment is the belt conveyor frequency conversion system. The investment in technological transformation is 3 million yuan, and the construction period is 1 month. The annual energy saving is 12000tce (the equipment life is 20 years), and the annual emission reduction is 31680tCO2. The annual energy saving economic benefit is 1.5 million yuan, and the investment recovery period is 2 years.
Typical Case 2: Jilin Tonghua Babao Coal Mine Project
Technology Provided by: China Coal Science and Technology Energy Saving Technology Co., Ltd.
Construction scale: 3 million tons of production capacity. The main technical reform content: main transport belt (one) energy efficiency optimization. The main equipment is the belt conveyor frequency conversion system. The investment in technological transformation is 3.5 million yuan, and the construction period is 1 month. The annual energy saving is 13100tce, and the annual emission reduction is 34,584tCO2. The annual energy saving economic benefit is 1.46 million yuan, and the investment recovery period is about 2 years.
Eight, promotion prospects and energy saving potential
The belt conveyor frequency conversion energy efficiency system has the advantages of improving production efficiency, speed regulation and energy saving, reducing accident rate, reducing fault handling time, and reducing on-site operators. Compared with CST, it avoids oil pollution and reduces starting impact to extend equipment life. Good energy saving economic benefits. It is estimated that in the next five years, the technology can be extended to 40% in mine belt conveyors, and the annual energy saving capacity is about 300,000 tce, and the annual carbon emission reduction capacity is 790,000 tCO2.
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