The power plant boiler high temperature slag is typically the use of recycled water for cooling the slag, and recycled water slag wasted heat into the cooling tower and the atmosphere. Not only the heat of the slag has not been fully utilized, but also the boiler thermal efficiency and recycled water evaporation were caused by the waste of water resources to a certain extent, and by thermal pollution on the environment. It is very important that Boiler high temperature slag wasted heat recovery for energy conservation, and improved the overall boiler thermal efficiency. The design of the works of three waste heat recovery scheme, the effect of energy saving and economic benefits of each program optimization calculation resulted in cold slag recycling power plant boiler and high temperature slag wasting heat for heating boiler feed water, the cold residue machine released hot water into the low temperature heater between 7# and 8#, there are very significant results and thus reduce the turbine extraction, reduce the turbine power heat rate, and improve the efficiency of the entire power plant power generation. Its findings can be generalized to other power plant boilers and lowtemperature waste heat recycling.

Through conducting numerical simulation on the combustion and heat transfer process of the boiler, under the conditions of the different temperature the temperature distribution and volume fraction distribution of the pollutant in the combustion chamber were predicted. The results show that when the furnace temperature met the production requirement if the secondary and tertiary air is preheated to a high-temperature, the total amount of air and coal are both reduced. Meanwhile, the amount of the pollutants could be reduced to achieve the purpose of energy-saving and emissions-reduction. As the increasing air temperature, the furnace temperature at the same section is more uniformity, thus the water wall tube would be heated uniformly, which is helpful for water cycle stability in boiler.Therefore, combustion technology of high temperature and low oxygen could be used in the pulverized coal boiler. To reach high-temperature air, a solar air-heater should be installed on boilers tail to utilize solar energy to assist the flue gas waste heat to heat the secondary and tertiary air to 873 K above.