Mineral furnace exhaust gas baking device: suitable for baking silicon iron manganese iron

1、 Source of tail gas from submerged arc furnace:

Mineral arc furnace, also known as electric arc furnace or resistance furnace. It is mainly used for reducing smelting ores, carbon reducing agents, solvents and other raw materials, and mainly produces ferroalloys such as ferrosilicon, ferromanganese, ferrochromium, ferrotungsten, and silicomanganese alloys. Mineral heat furnaces are mainly divided into two types: semi enclosed and enclosed. The exhaust gas generated by enclosed furnaces contains a large amount of combustible components and impurities. After purification treatment, it can be used as an important fuel for the mineral heat furnace exhaust gas burner (gas burner) designed by Zhengzhou Zhongwei Environmental Protection Equipment Co., Ltd. It is widely used in industrial fields such as heating furnaces, dryers, baking machines, rotary kiln burners, smelting furnaces, and internal combustion engine power generation.

The exhaust gas (FOF) generated during the production of ferroalloys in a submerged arc furnace is mainly composed of CO, as well as a small amount of H2, CO2, etc. Carbon monoxide (CO) gas is formed due to the presence of carbon in the reducing agent. If the reducing agent contains volatile hydrocarbons, hydrogen gas (H2) will be formed. In the past, the exhaust gas of the submerged arc furnace was burned through the exhaust gas burner of the submerged arc furnace, making full use of energy.

2、 Combustion characteristics and application of tail gas from submerged arc furnace

The calorific value of the tail gas from a submerged arc furnace is usually only about 1/3 of the calorific value of natural gas, equivalent to a large calorie value of 2500-2800 kcal/cubic meter. The laminar flame speed (LFS) during the combustion of tail gas from a submerged arc furnace is much faster than that of natural gas, which is related to the proportion of hydrogen content in the gas. The laminar flame velocity is the rate at which oxidation reactions occur at the front of the laminar flow, that is, the relative velocity between the unburned mixture and the flame front. Given the unique combustion characteristics of FOF, the parameters of the combustion control system for the tail gas burner of the submerged arc furnace need to be specially designed to adapt to its characteristics, while also meeting the NOx emission requirements.

The main characteristics of Zhengzhou Zhongwei Environmental Protection Equipment Co., Ltd.'s innovative submerged arc furnace exhaust gas burner equipment are as follows, in response to the special combustion characteristics of the exhaust gas fuel in the submerged arc furnace:

1. The structure of the tail gas burner of the submerged arc furnace is more reasonable, and the mixture of fuel and combustion air is more thorough, which will result in more complete combustion and achieve the goal of fuel energy conservation.

2. The tail gas burner belongs to a split combustion machine, which integrates mechanical and electrical equipment, combustion and control system functions, and can achieve automatic ignition, flameout protection, flame monitoring and alarm, temperature control. It can be connected with the DCS system to achieve local and remote automation control functions.

3. The gas pipeline and combustion air pipeline are designed with explosion-proof pneumatic valve groups (regulating valves and shut-off valves), with a higher safety level. The anti backfire device ensures that in special circumstances, the gas backflow pipeline is prevented from encountering open flames and causing pipeline explosions.

4. The baking machine cover adopts a high-temperature resistant fiber cotton or castable structure, and the cover is attached to the opening to reduce heat loss.

5. The burner combustion tube of the baking machine is made of stainless steel 310s (Cr25Ni20) or silicon carbide material, which can withstand high temperatures between 1100 and 1300 ℃. The baking machine bracket and accessories are made of national standard materials to reduce maintenance costs and extend service life.

6. The baking machine cover can be designed for lifting and rotating, making it easy to operate on site.  

Zhongwei Environmental Protection Group Co., Ltd. specializes in producing various types of gas fuel electric heating and baking equipment, and undertakes the energy-saving, intelligent, safety, and environmental protection technology upgrading project for large steel enterprises: oxygen rich pure oxygen regenerative gas baking equipment and scrap preheating system. For more details, please feel free to call (WeChat synchronization): 15713691937.

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