The hot-blast stove is a mainly auxiliary equipment used for pneumatic drying device, spray drying device, fluidizing drying device, tower-type drying device, tunnel drying device and rotary drying device. It is widely used in many industries, such as: agricultural production, agricultural products and food processing, metallurgy, building materials and plates manufacturing. Since the 12th Five-Year Plan, the state puts forward the slogan of construction the society of frugal-resource and friendly-environment, so the hot-blast stove market certainly will become energy saving and environment friendly instead of the extensive form.
The disadvantages of the traditional hot-blast stove:
The coal cinder cannot be burned fully, which causes the energy waste
The gas consumption is high, the use ratio of circulatory flue gas is only 40%~60%, which caused high enterprise cost
The Nox emission is high, the exhaust gas has a high oxygen content, and the emission index is high after amortized computation
Using the traditional hot-blast stove will consume more resource and cause serious pollution, so how to upgrade and transform the traditional hot-blast stove technology is the mainly work for the moment. CHAENG’s new environmentally upgraded industrial residue resource utilization plan conforms to the trend of green development. Through transforming the hot-blast stove system, we can greatly reduce the production cost, improve the benefit of environmental protection, and the natural gas consumption of finished mineral powder per ton reduces to 8.2m³/t.
The advantages of CHAENG’s hot-blast stove technology transformation
1.Ultra-low Nox emissions
With low nitrogen design, the burner and furnace body adopts big flue gas recirculation system, the NOx content in the off-gas from the outside of the slag vertical roller mill
production line is ≤50mg/Nm³
2.Low gas consumption
The off-gas circulation utilization rate becomes 80%~90% from 40%~50%; improve the heat utilization ratio and reduce the natural gas consumption of finished mineral powder per ton
3.Low environmental tax burden
Significantly reducing off-gas emissions from the outside and environment tax
4.No refractory material structure design
There is no refractory materials design in the furnace body, which can eradicate the falling off of refractory bricks because of frequently starting and stopping the machines
The equipment model table
||Scale of the production line
||The rated heating capacity of traditional stove
||The rated heating capacity of new stove
||Gas consumption of finished product per ton of traditional stove
||Gas consumption of finished product per ton of new stove
||Slag powder production line with an annual output of 300,000 tons
||Slag powder production line with an annual output of 450,000 tons
||Slag powder production line with an annual output of 600,000 tons
||Slag powder production line with an annual output of 1,000,000 tons
Comments: the gas consumption quantitative value finished product per ton comes from the below conditions:
Without spraying, the comprehensive water content of the feeding raw materials is 8%, the finished product specific surface area is 420m²/kg, and the system air leakage rate is ≤2%.
In order to practice the green development concept, CHAENG improved their own gas hot-blast stove to reduce the production cost and increase the environmental protection benefit at last.