Energy-saving Application Effect of Frequency Converter in Thermal Power Enterprise

With the continuous advancement and refinement of frequency conversion technology, its outstanding energy-saving performance, excellent starting characteristics, and comprehensive protection functions have been widely applied in enterprises. This has enabled companies to reduce energy consumption, lower operational costs, and improve overall efficiency (ASD). 1. **Features of the Inverter** Frequency control is considered the most advanced and promising method for speed regulation. The inverter is a key product used for speed control of three-phase asynchronous motors in industrialized countries. Its main advantages include: a significant energy-saving effect, up to 55%; a wide speed range with a ratio of up to 20:1; excellent starting and braking performance, allowing for smooth start-up, automatic acceleration, deceleration, and rapid braking; and a complete set of protection functions that can detect and display various faults such as overvoltage, undervoltage, overload, overcurrent, power failure, short circuit, and stall. Additionally, it is easy to integrate into electronic computer systems and supports long-distance control. 2. **Application of Frequency Control Technology in Cogeneration Systems** 2.1 **Central Heat Exchange Station and External Network Control** The boiler system includes constant pressure water supply, hot water circulation, combustion control, and furnace pressure regulation. In cogeneration systems, superheated steam can be directly output or exchanged through steam and water before being supplied to users via heat exchange stations in the pipeline network. 2.2 **Control of External Network Circulation Pumps** Maintaining stable pressure in the heating system is essential for normal operation. The heating network is typically a closed-loop system, where theoretically, water consumption is minimal. However, factors like leakage, blowdown, and human error can affect pressure stability. To ensure consistent heat supply, a constant pressure point must be set on the return pipe. A constant-pressure water pump adjusts the speed of the replenishment pump to maintain system pressure and prevent over-temperature or over-pressure conditions. Pressure sensors convert the signal from the constant pressure point into a 4–20 mA current signal, which is sent to a regulator. The regulator compares this signal with a preset value and sends a frequency command to the inverter, adjusting the pump motor speed accordingly. Due to the incompressibility of water, the system responds quickly and maintains pressure at the desired level. In heating systems, water acts as the medium for thermal energy transfer. Higher water temperatures and greater flow rates mean more heat is delivered. By using frequency conversion speed control, the flow of the circulating pump can be adjusted while maintaining system pressure, ensuring safe and efficient operation. Temperature sensors monitor the system and adjust the pump speed based on temperature differences, indirectly regulating the system's heat output. 2.3 **Control of Induced Draft Fan with High-Voltage Frequency Conversion** High-voltage inverters use multiple single-phase three-level inverters connected in series to produce high-voltage AC. Motor speed is determined by frequency, and adjusting the frequency allows precise control of motor speed. The inverter consists of a transformer cabinet, power cabinet, and control cabinet. Input voltage is stepped down and phase-shifted before being processed by the power unit. The control unit uses optical fibers to communicate with each power unit, enabling real-time adjustments. On the output side, units are connected in series using a star configuration, producing a smooth PWM waveform that reduces stress on cables and motors. This design minimizes harmonic losses, mechanical vibrations, and bearing wear, making it ideal for retrofitting older equipment. 2.3.1 **Operation and Startup of the Inverter** There are three operating methods: local control via the touch screen, remote control using switches and analog inputs, and DCS integration for seamless process control. Startup options include normal startup, soft start, and bypass mode for maintenance. 2.3.2 **Energy-Saving Analysis After Frequency Conversion** In Tianjin, coal-fired boilers must install desulfurization and dust removal systems, increasing fan resistance and power requirements. Traditional damper control lacks precision and consumes more energy. Using an inverter allows the induced draft fan to adjust according to load changes, optimizing performance and reducing energy use. For example, a 315kW motor operating 8640 hours annually could save 544,320 kWh, saving around 544,000 yuan in electricity costs. 2.4 **Inverter in Water Level Regulation** When the drum water level changes, the transmitter sends a signal to the regulator. The regulator calculates the deviation and sends a command to the inverter, adjusting the pump motor speed to stabilize the water level. 3. Variable frequency speed control technology is increasingly widespread across industries. Its energy-saving benefits and compatibility with automated systems make it a core component in power-driven applications. Moreover, the implementation of frequency control is an effective way for companies to modernize operations and boost profitability.

Diaphragm Fiber Fabric Air Duct

Diaphragm Fiber Fabric Air Duct,Insulation Air Duct,Central Ac Duct,Pvc Air Duct Fabric

Jiangsu Buna Technology Development Co. , Ltd. , https://www.ductbuna.com