China's experience in coal-fired electricity reduction to international promotion

Recently, the International Energy Agency (IEA) released the report “Utilizing the Comprehensive Upgrade of Coal-Fired Power Plants to Achieve Emission Reduction: A Chinese Experience”. Taking China's two generator sets as a case, it is possible to increase the net efficiency and CO2 emission reduction through the measurement and display of integrated transformation and upgrading. It is pointed out that China's experience can be promoted globally to improve the efficiency of coal-fired power plants.

The main purpose of this cooperation between IEA and the National Energy Administration of China is to evaluate the efficiency of two coal-fired generating units in China, provide examples of energy-saving targets, determine the scope for future improvements, and work with other major coal-fired power generation countries. Share research results.

The two generator sets were selected from two coal-fired power plants in Shandong Province and Jilin Province in China. The two 300 MW turbines selected used more than 10 years, namely A3 and B4 respectively.

The evaluation results of the two coal-fired generating units A3 and B4 show that the energy-saving effect is good, and the improvement measures adopted in recent years have played an active role in reducing carbon dioxide emissions. In other words, these measures improve combustion performance and optimize boiler efficiency; maximize energy savings by optimizing steam cycles; reduce parasitic power consumption by upgrading different pumps, engines, drives, and power supplies; and determine the most based on operating experience, procedures, and maintenance practices. Good practice experience.

Based on operational practices and coal components, a typical 300 MW unit has an annual CO2 emission of approximately 1.5 million tons. In Power Plant A, the improvement of generating unit B3 has already led to a reduction of 25,000 tons of CO2 emissions per year and an additional reduction of 41,000 tons. In Power Plant B, the improvement of generating unit b4 has already reduced the annual CO2 emission by 73,000 tons, and the combined improvement of the cogeneration model can reduce an additional 46,000 tons. The operation efficiency of the A3 boiler is high, and the steam turbine needs a major inspection. On the contrary, the B4 steam turbine inspection operation is good, but the boiler efficiency is not optimized. Therefore, it is estimated that a single 300 MW unit can reduce CO2 emissions by between 100,000 tons and 110,000 tons per year, and reduce emissions by approximately 6% to 7%. The premise of the assumption is that the unit has been operating for more than a decade, has been repaired but has not been upgraded, and the annual operating time is approximately 5,500 hours. Although the efficiency of the two units has not improved much, the A3 unit has increased by 1.8%, and the B4 unit has increased by 3%, but the cumulative improvement efficiency is still very considerable.