Suspension roasting device of powdery active lime and production technology of suspension roasting device

Abstract

The invention relates to the technical field of active lime production, in particular to a suspension roasting device of powdery active lime. The upper end of a first cyclone preheater is communicatedwith one end of a discharge flue, the side wall of the discharge flue is communicated with the upper end of a waste heat boiler through a third pipeline, the lower end of a roasting furnace is communicated with a burner, the lower end of the side wall of the burner is connected with a fuel inlet pipeline, the lower end of the side wall of a stepped cooling device is communicated with an air inletpipe, air heated by a cooling system enters the roasting furnace to be used for fuel combustion, waste heat is fully recycled, heat loss is effectively reduced, the resource utilization rate is high,mass production is facilitated, little equipment is used, the floor area is small, operation automation and waste heat recycling are facilitated, the production cost can be reduced, the produced powdery active lime has good activity, the production efficiency is high, the production time is shortened, and the economic benefits of an enterprise can be increased.

Description

technical field [0001] The invention relates to the technical field of active lime production, in particular to a suspension roasting device for powdery active lime and a production process thereof. Background technique [0002] In recent years, powdered active lime has increasingly become a key basic material in the application of high-tech materials such as iron powder sintering, lightweight building materials, and chemical and chemical industries. With the sharp increase in domestic market demand and the continuous increase in environmental governance, lime The production industry is facing tremendous pressure to eliminate backward production capacity and upgrade production technology. [0003] At present, there are mainly three kinds of active lime production methods at home and abroad. The first method uses a vertical kiln as the main roasting equipment, usually using lump limestone larger than 20mm as raw material and lump coal as fuel. ; The second type is usually al...

AI Technical Summary

Problems solved by technology

[0004] Although the first production method has less investment and lower heat consumption, it has serious environmental pollution problems such as coal tar; the second production method has lower heat consumption and can achieve up-to-standard emissions, but the investment is significantly higher , the equal-scale production capacity is more than ten times higher than that of the vertical kiln, and the types of fuel are limited; the third production method usually uses coal powder as fuel, although the product quality is relatively stable and can achieve emission standards, but the investment and Maerz The kiln is equivalent, and the heat consumption is obviously higher

At the same time, these three types of production methods still have the following common shortcomings: (1) The daily production capacity of a single system is limited by the production process. The maximum daily output of the first and second production methods usually does not exceed 600 tons, and the third production method is the highest. The daily output usually does not exceed 1,200 tons; (2) the optimal roasting temperature is difficult to determine and control; (3) the waste of limestone resources is serious, because the above-mentioned active lime production method usually only uses block limestone raw materials within 20-80mm Production, often resulting in waste of more than 30% of limestone resources

These wasted fine limestone forms mining waste, which will cause land occupation and environmental pollution, forming secondary disasters; (4) The firing time is long, and it takes 4-10 hours or even longer from raw material input to product output (5) Due to the use of massive limestone, the products produced by these three production methods often still have 5% overburned material and 5% raw burnt material, which makes the product quality worse and affects downstream production and product quality (6) The lime produced by the aforementioned production method has a lime conversion rate of 80-90%, and an activity degree of ≥280ml; the lime is in block shape, which causes inconvenience and cost increase to industries that need to use powdered active lime; (7) It is difficult to realize the automation and intelligent control of the entire production system

Images