The high temperature flue gas discharged from various metallurgical furnaces often takes 20 to 50% of the heating capacity of the furnace. Metallurgical furnace flue gas and preheated medium flow direction is opposite, can more fully utilize the residual heat of flue gas to achieve a higher preheating temperature, the wall of the furnace needs to be made of heat-resistant materials.

Due to energy shortage, with the further development of energy conservation work. Various new, energy-saving advanced furnace types are becoming more and more perfect, and the use of new refractory fibers and other high-quality insulation materials makes the furnace heat loss significantly reduced. The advanced combustion device strengthens the combustion, reduces the incomplete combustion and makes the air fuel ratio more reasonable. However, the technology of reducing exhaust heat loss and recovering residual heat from flue gas is still undeveloped. In order to further improve the thermal efficiency of the kiln and achieve the purpose of energy saving and consumption reduction, the recovery of waste heat from flue gas is also an important way of energy saving.

Flue gas is the main way to waste energy for general energy-consuming equipment, such as boiler exhaust energy consumption is about 15%, while other equipment such as printing and dyeing industry stereotypes, dryers and kilns are mainly through flue gas emissions. The waste heat recovery of flue gas mainly converts the heat carried by the flue gas into usable heat by some heat exchange method.

Accompanied by the completion of 60 gas-fired boilers, Urumqi this year carried out flue gas waste heat recovery and transformation of gas-fired boilers, ahead of schedule to complete the task.

This also means that the flue gas temperature of these retrofitted gas-fired boilers will be reduced from 120 C to below 40 C, and the thermal efficiency of the energy-saving boilers will be increased by more than 10%, which will save 38.5514 million square meters of gas, 50,847.52 tons of standard coal and 56.42 tons of nitrogen oxides annually. Simply speaking, the waste heat recovery of flue gas is to recover and reuse the waste heat of flue gas released after boiler combustion, so as to achieve the purpose of energy saving and emission reduction. To speak more plainly is to change waste into treasure as much as possible.

Many people have the impression that in the past, smoke around the energy-saving boiler room in winter, because natural gas contains a lot of hydrogen elements, combustion produces a lot of water vapor. When the exhaust temperature is high, the water vapor condenses when it meets the outdoor cold air. As the flue gas is discharged, a "white smoke" is formed. A large amount of heat brought by steam also causes waste of heating cost and affects the heating effect. The white smoke is the residual heat of the flue gas.

Flue gas waste heat is one of the industrial waste heat. Flue gas waste heat recovery is a new way to improve the utilization rate of waste heat resources and tap the potential of energy conservation. The data show that the energy consumption in China's industrial sector accounts for about 70% of the total energy consumption in the country, and the energy consumption per unit of major industrial products is about 30% higher than the international advanced level on average. In addition to the relatively backward production process, unreasonable industrial structure and other factors, low industrial waste heat utilization rate is also an important reason for high energy consumption. China's energy utilization rate is only about 33%, which is about 10% lower than that of developed countries. At least 50% of industrial energy consumption is directly discarded by various forms of waste heat. But at the same time, it also shows that the recovery and reuse of waste heat resources may be used as a "new energy" to promote energy conservation and emission reduction work in-depth.

Urumqi began to implement the "coal to gas" project in 2012, not only to improve the quality of public living, transportation and other public environment, but also to promote energy conservation and environmental protection and economic and social development of the city and the autonomous region has a special significance. In 2014, Urumqi began to implement gas boiler flue gas waste heat recovery and transformation work, it should be said that this work is carried out in Urumqi to control air pollution and promote environmental protection to further enhance and consolidate.

Environmental protection is a career without end. We should not only do a good job in protecting pollution from the perspective of pollution control, but also do a good job in saving resources from the perspective of "turning waste into treasure".

At present, many areas in the Mainland have carried out waste heat recovery of flue gas, waste water and other waste heat recovery. For example, some hospitals, hotels, hotels, schools, swimming pools, canteens produced waste water, waste gas, containing medium and high-temperature secondary energy use of waste water generated by flue gas waste heat, can be recycled, not only saving resources, but also improve the utilization of resources.

Flue gas waste heat recovery, energy conservation and emission reduction, promote environmental protection projects; today we are only used in heating, perhaps in the near future, there will be greater use. The waste heat recovery of flue gas in heating enterprises provides us with a way of recycling and reuse. We hope that more enterprises and units can get inspiration from it.

Welcome to pay close attention to the official website of Qingli Company in real time, master more waste heat recovery of flue gas, energy conservation and emission reduction, environmental protection projects; improve the efficiency of waste heat recovery of flue gas energy saver, improve industrial waste treatment, purify living environment space, is a great value product. For more information on waste heat recovery energy saver products and industry trends, visit www.gzqingli.com/Product Engineering Consulting Hotline: 020-28140958