NOx treatment | reheating furnace: improve energy efficiency, new challenge of emission reduction


Release time:

2024-05-07

Reheating furnaces are widely used in several industrial sectors, in the steel industry, to improve energy efficiency and economic efficiency while reducing pollution. However, the operation of reheating furnace may produce nitrogen oxides, so it is necessary to carry out in-depth pollution treatment, and install temperature compensation device and SCR denitration system to meet the requirements of environmental protection.

As an industrial kiln, reheating furnace is widely used in steel industry, cement industry, chemical industry, waste collection and incineration industry, non-ferrous metal smelting, coking industry, etc. In many industrial fields, reheating furnaces enhance the efficiency of waste heat recovery systems by increasing the temperature of waste heat flue gas, helping to improve energy utilization efficiency and reduce environmental pollution, but in the process of operation, it may produce nitrogen oxides (NOx), which is a threat to the environment and human health.

In the steel industry, the reheating furnace involves combustion technology, heat transfer technology, intelligent control and energy saving and environmental protection, etc. Its operation is mainly to improve the temperature of the waste heat flue gas to meet the design and operation requirements of the waste heat boiler, while improving energy utilization efficiency and economic benefits, while reducing pollution. Here's how reheating furnaces operate in the steel industry:

1, the use of secondary combustion technology, in front of the waste heat boiler to add a secondary combustion boiler or in the flue arrangement of burners, is conducive to the fuel provided by the steel plant, through incineration to produce high temperature smoke.

2, through the mixture of high temperature flue gas and sintering waste heat gas heat exchange, so as to increase the temperature of sintering waste heat gas, so as to achieve the working temperature of waste heat boiler.

3, by adjusting the temperature of the flue gas to adapt to the change of sintering conditions, reduce the adverse impact caused by the temperature fluctuation of the flue gas.

4, through the operation of reheating furnace, reduce the number of start-up and shutdown of waste heat boiler and gas turbine, extend the service life of equipment, improve the thermal efficiency of the system.

Reheating furnaces may produce nitrogen oxides (NOx) during operation, and if NOx emissions from reheating furnaces exceed local environmental regulations, SCR denitrification equipment needs to be installed in order to meet more stringent environmental standards. Industrial kilns need to conduct in-depth pollution control, including nitrogen oxide emission control, but the efficiency of SCR denitrification device is affected by the temperature of the catalyst. If the flue gas temperature of the reheating furnace fails to reach the set temperature, the efficiency of catalyst denitrification will be affected. Therefore, it is necessary to install a temperature compensation device and optimize the boiler steel frame structure. To meet the requirements of SCR denitration system.

SCR denitration system of Guangdong Green Valley Environmental Protection Technology Co., Ltd. has independent intellectual property rights and a number of invention patents, and has accumulated a lot of experience in various fields, which can ensure that the project design is reasonable, stable and reliable operation, meet the national environmental requirements, ultra-low nitrogen oxide emissions and ammonia escape requirements of less than 3ppm.