The energy cost of steel plant accounts for about 25%-40% of the total production cost. There is a considerable gap between the energy cost of excellent energy-saving enterprises and that of lagging enterprises, and the energy efficiency of steel mills relates to the benefit and competitiveness of enterprises. The saving-energy and improvement of energy efficiency in steel mills are from the following aspects.
(1) Replace or upgrade low-energy-efficient equipment through process technology transformation, and promote compact and continuous metallurgical processes.
(2) Pay attention to the recovery of low-grade waste heat from various types of low-temperature flue gas, slag flushing water and circulating cooling water, and vigorously promote advanced technologies such as waste heat recovery from coking rising tubes, waste heat recovery from the low-temperature section of sintering, and waste heat recovery and utilization from electric furnace flue gas.
(3) Improve energy conversion efficiency and apply the latest energy conversion technologies such as gas-steam combined cycle power generation (CCPP), sub-critical and other high parameter full coal gas power generation, ultra-high pressure dry quenching coke power generation, low temperature waste heat organic Rankine cycle power generation (ORC), by-product gas to methanol and liquefied LNG, low energy consumption large-scale air separation units, adsorption oxygen production, centralized group control intelligent compressed air energy saving system, hydraulic system Servo-controlled energy saving, potential energy recovery and other technologies.
(4) Apply energy-efficient motors, air compressors, pumps, fans, transformers, water turbines, etc. to achieve system energy conservation and optimise governance of power quality.
5) Make full use of wind and solar energy, increase the use of new energy sources as a percentage, and promote the coupling of energy storage and heat storage devices with enterprise gas power generation and waste heat power generation to strengthen the adjustable capacity of enterprise energy systems. In areas where renewable energy is abundant, hydrogen and oxygen are produced for steel production through green electricity.
6) Strengthen plant energy metering and improve energy management systems.
