With the formulation and implementation of various policies, the gradual improvement of the market mechanism, the energy-saving service industry has entered a rapid development track, and the size of the energy-saving service industry has steadily increased. In recent years, the industry's total output value has maintained rapid growth, and the year-on-year growth rate of the industry's output value has remained above 20% since 2009. In the future, the steel and metallurgical industries are likely to become the new development direction of waste heat power generation projects.
Facing the adverse background of the sluggish high-energy-consuming industries in 2014 and the decline in energy prices, the total output value of the industry in 2014 reached 265 billion yuan, an increase of 22.95% compared with 2013. According to the forecast of the "Twelfth Five-Year Plan for Energy-Saving and Environmental Protection Industry Development", the total output value of China's energy-saving service industry will exceed 300 billion yuan in 2015. In addition, the scope of services provided by the energy-saving service industry continues to expand. At present, the service scope of the energy-saving service industry has expanded to many fields such as industry, construction, and transportation. Among them, the industrial field is the most important driving force for the growth of the energy-saving service industry. In 2013, the contribution rates of the three major sectors of industry, construction and transportation to total output value were 72%, 21%, and 7%, respectively.
Waste heat power generation in the cement industry is the industry with the most mature domestic waste heat power generation technology and the largest number of construction projects. Now, many energy-saving and environmental protection companies have begun to shift their business direction from the cement industry to glass, steel, coking, ferroalloy, chemical and other industries. It is an inevitable trend that waste heat power generation will be transferred to other industries and go overseas. Taking steel as an example, the energy consumption of the iron and steel industry accounts for about 15% of the total industrial energy consumption in the country, of which the waste heat resources are abundant and there is a large space for energy conservation. According to the "Forecast and Investment Strategic Planning Analysis Report of China's Waste Heat Power Generation Industry 2016-2021" by the Institute of Foresight Industry, the total waste heat generated by tons of steel in China's large and medium-sized enterprises accounts for about 37% of the energy consumption per ton of steel, and the waste heat resources are very considerable. . This provides the basis for the implementation of waste heat power generation projects.
China is a major steel producer, with steel output ranking first in the world for many years, exceeding the total output of the second, third, and fourth countries. For a long time, due to the large proportion of backward production capacity and the ineffective control of pollutant emissions, the total energy consumption of the steel industry has remained high, accounting for about 14% of the country's total energy consumption and 25% of the total industrial energy consumption. Therefore, it is of great significance to carry out energy conservation and emission reduction in the steel industry. Among them, the effective recovery and utilization of waste heat and pressure is the main energy saving and consumption reduction method, and the market space is huge.
At present, the number of waste heat power generation projects in China's steel industry is far lower than that of the cement industry. Data show that during the "Eleventh Five-Year Plan" period, sintering waste heat power generation projects have been implemented with a sintering capacity of 70 million tons, but only accounted for 10% of the national sintering capacity.
Although the future of steel, metallurgy and other industries has a bright future, technology penetration will take time. At present, China's cement kiln waste heat power generation technology is relatively mature and has reached the international advanced level. However, if it is applied to industries such as iron and steel, for different heat sources, thermal qualities, flue gas components, etc., it still needs to be modified according to specific conditions.