1. Use energy-saving combustion technology
One of the main causes of energy waste in industrial furnaces is the heat loss caused by incomplete combustion. It is caused by chemical incomplete combustion and mechanical incomplete combustion. Incomplete chemical combustion can cause heat loss due to the incomplete combustion of combustible gases such as carbon monoxide, hydrogen and ammonia in the exhaust smoke, which can cause black smoke from industrial furnaces that use scattered coal as fuel. The high-temperature dust in this black smoke, sulfur dioxide, carbon dioxide, etc. will cause pollution to the atmospheric environment. The heat loss of mechanical incomplete combustion is mainly reflected in the incomplete combustion of coal particles, ash and fly ash particles. These ash and particles can also cause great damage to the environment. Oxygen-enriched combustion technology can greatly increase the combustion temperature and reduce the amount of combustion-supporting air, so as to reduce the amount of flue gas and the loss of gas heat, which not only saves fuel, but also prolongs the service life of industrial furnaces and kilns, and improves industrial furnaces The output and so on. However, the oxy-fuel combustion technology will produce a large number of by-products such as nitrogen when separating air. It will not only have no effect on the improvement of air pollution, but can aggravate the deterioration of air quality. At the same time, related equipment will also increase power consumption. The use needs to be improved and studied. In industry, we can also use high-temperature air combustion technology and magnetization treatment before the fuel enters the furnace to achieve the purpose of energy saving and consumption reduction.
2. Waste heat recovery and utilization technology of industrial furnace
The large amount of flue gas produced by the industrial furnace will take away a large amount of heat energy, which is called waste heat. The recovery and utilization of these waste heat can save energy while reducing air pollution. At present, we can assemble a preheater and use flue gas to support combustion. It can also be equipped with a waste heat boiler to use the waste heat of the flue gas to burn hot water, which can be used in industrial or domestic use. We can also use the waste heat of the flue gas to preheat components that have already been cooled or as a heat source for a low-temperature furnace. The widest and most effective application is the use of heat exchangers. When the discharge temperature is below 200°C, the energy saving effect can reach more than 30%. At present, heat exchangers with a wide range of applications in my country include chip, jet, combined and cyclonic tube heat exchangers. After their application, energy-saving benefits are greatly improved.
3. Thermal system and testing technology
At present, the energy consumption and serious pollution of industrial furnaces in our country are mainly caused by inadequate or relatively backward technologies for fuel and air conditioning and detection. This situation puts forward higher requirements on the thermal detection and control technology of industrial furnaces. The use of advanced microcomputer control system and advanced automation control technology can achieve precise control and regulation of the system and its related components, such as controlling the furnace temperature and fuel flow of industrial furnaces, and controlling the oxygen content of flue exhaust gas.
4. Improvement of furnace structure and furnace building materials
In order to achieve the purpose of energy saving and emission reduction, we can improve the furnace structure of industrial furnaces or choose new energy-saving materials to improve energy efficiency. Generally speaking, if the furnace space cannot be increased, we can choose to increase the heat exchange area between the furnace and the device, or use a circular furnace body to reduce the area of the outer wall of the industrial furnace and thus reduce the heat dissipation loss of the furnace wall. We can also install a fan in the furnace of the industrial furnace to enhance the convection heat transfer function in the industrial furnace. The flow of high-speed airflow in the industrial furnace will destroy the surface of the workpiece and hinder heat transfer to shorten the heating time of the workpiece and achieve the purpose of quickly increasing the temperature of the workpiece. This method will be more effective when applied to a small heating furnace.
