Pulverized coal burner for oxidation pellet rotary kiln: gas mixed combustion burner

1、 Concept and application of oxidized pellets:

Oxidized pellets are one of the important methods for making fine ore blocks. First, add an appropriate amount of water and binder to the powder ore to make a green ball with uniform viscosity and sufficient strength. After drying, preheating, and roasting in an oxidizing atmosphere, the green ball is agglomerated to make pellets. This method is particularly suitable for processing fine concentrate powder. Pellets have good cold strength, reducibility, and particle size composition.

In the steel industry, pellets and sintered ore have become equally important blast furnace materials, which can together form a better burden structure. At 300~800 ℃, magnetite is oxidized to Fe2O3 microcrystals. The newly generated Fe2O3 microcrystals have high migration ability, promoting the growth of microcrystals to form connecting bridges (also known as Fe2O3 microcrystalline bonds), which bond the particles in the green sphere to each other. However, the growth of such microcrystals is very limited, so the pellet strength is not high at this time. Only when the green pellets are heated to 1000~1300 ℃ by the rotary kiln burner designed by Zhengzhou Zhongwei Environmental Protection Equipment Co., Ltd. in a strong oxidizing atmosphere, the Fe2O3 microcrystals can be recrystallized, and the growing phases are closely linked into a piece of hematite crystals; If the heating temperature is higher than 1300 ℃, the consolidation between particles will be weakened and the pellet strength will be reduced due to the following reactions: 3Fe2O3===2Fe3O4+1/2O2Fe2O3===2FeO+1/2O2. Therefore, under the strong oxidizing atmosphere and the roasting temperature of 1100~1300 ℃, the magnetite pellets will form crystal bridges between particles, microcrystalline growth and recrystallization, which is the basic form of pellet consolidation.  

2、 Classification of oxidation pellet rotary kiln burners:

The oxidation pellet rotary kiln burner is the core component of the pellet rotary kiln equipment and an important combustion device. Zhengzhou Zhongwei Environmental Protection Equipment Co., Ltd. classifies the fuels used for the oxidation pellet rotary kiln burner into: multi-channel coal powder burner, natural gas oxidation pellet rotary kiln burner, blast furnace gas oxidation pellet rotary kiln burner, converter gas oxidation pellet rotary kiln burner, coke oven gas oxidation pellet rotary kiln burner, ore furnace gas oxidation pellet rotary kiln burner, gas mixed combustion oxidation pellet rotary kiln burner Oil and gas mixed combustion oxidation pellet rotary kiln burner, etc.

Zhengzhou Zhongwei Environmental Protection Equipment Co., Ltd. Pellet Rotary Kiln Equipment Service Scope:

1. Design, production, installation, debugging, and training work for the burner of the oxidation pellet rotary kiln.

2. Automation control system engineering. Engineering design, integration, installation, debugging, and training of rotary kiln automation control system.

3. Refractory materials and masonry construction engineering for the rotary kiln body.

4. Design, production, and installation of desulfurization, denitrification, and online monitoring equipment for rotary kilns.

5. The "turnkey" project for the design and construction of gas, fuel, and coal powder equipment and pipelines. For more details, please call (WeChat synchronization): 15713691937.

Some of the content and pictures are extracted from the Internet. Please contact us for deletion if there is any infringement.