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Desulfurization limestone powder grinding mills

Source:nclirik Posted:2021-09-01

Desulfurization Limestone

The desulfurization limestone powder furnace is fully burned. Generally, tail flue gas is directly used for desulfurization.
The limestone powder used for desulfurization requires a particle size of 250 mesh or 325 mesh (45 μm). The desulfurization effect of 325 mesh limestone powder is better.

desulfurization limestone

Desulfurization Limestone Powder Grinding Mills

To produce such fine limestone powder, basically the mill mainly uses Raymond mill, pendulum mill, ball mill or 21r powder mill (also named HGM micro powder grinding mill).
In the past, Raymond mills and ball mills have been used more.
With the increase in the fineness of limestone powder and the need for energy saving and emission reduction. In recent years more and more power plants have begun to adopt 21R grinding mill schemes for the preparation of limestone powder by flue gas desulfurization.

Raymond mill for desulfurization limestone

21r Grinding Mill For Desulfurization Limestone Powder Making

21R grinding mill also named HGM micro powder grinding mill. It is made by CLIRIK Machinery. Combines powder grinding and powder selection functions in one
HGM grinding mill can be used for making 150-3000 mesh powder. D97<2500 mesh, 2μm<30%.

21r grinding millHGM micro powder grinding mill for limestone

Avaible materials

It is suitable for processing non-inflammable, non-explosive and brittle materials with Moh's hardness under 6, such as limestone, calcite, gypsum, marble, barite, dolomite, kaolin, bentonite, talc, mica, illite, pyrophyllite, and etc.

Working principle

The material enters the equipment, is thrown to the edge of the turntable, falls into the grinding cavity, and becomes powder after multiple grinding.
The fan extracts the ground powder, and is controlled by the powder separator. The powder that does not meet the requirements is returned to the machine cavity, and then ground and thinned again.
The powder that can pass through the powder separator is the finished product, and the pulse dust collector separates the powder from the air to achieve the purpose of collection.
The production process runs under negative pressure, and there is no dust spillage.


Parameters of HGM Series Micro Grinding Mill
Model HGM80 HGM80A HGM90L HGM100L-Ⅱ HGM100P HGM125L HGM1680L
Ring Diameter(mm) 800 800 900 1000 1000 1250 1680
Ring Number (PCS) 3 3 4 4 4 4 4
Input Size (mm) ≤10 ≤10 ≤10 ≤15 ≤15 ≤20 ≤20
Output Size (mesh) 150-3000 150-3000 150-3000 150-3000 150-3000 150-3000 150-3000
Capacity (t/h) 0.5-5.5 0.5-5.5 0.8-6.5 1.2-10 1.2-11 2.5-20 5-45
Outlet Size L*W*H (mm) 8605*4139*6050 10454*3393*6626 11735*3952*7525 14507*3633*7562 14362*4200*7562 19261*4406*8591 25067*5414*9007
Main motor power (kw) 75 75 55*2 132/75*2 132/75*2 185 315

Limestone Desulfurization

Limestone-gypsum flue gas desulfurization wet process (FGD) and furnace calcium injection technology are currently the world's most mature and widely used SO2 emission control technology.
Whether it is flue gas desulfurization or furnace calcium injection desulfurization, its desulfurization medium All are limestone powder.
So the preparation of limestone powder becomes a prerequisite for desulfurization in thermal power plants and steel plants and improving desulfurization efficiency.
After years of research and use, a new type of desulfurization and pulverization equipment and technology has been developed, which can not only meet the limestone-gypsum flue gas desulfurization wet process (FGD) of pulverized coal furnaces, but also be obtained in the field of circulating fluidized bed (CFB) desulfurization. It is widely used.

limestone desulfurization

The principle of limestone desulfurization:

Limestone decomposes at high temperature: CaCO3 == (high temperature) == CaO + CO2↑

Combination of calcium oxide and sulfur dioxide: CaO + SO2 == (high temperature) == CaSO3

Desulfurization Limestone Powder Process Description

The first stage --- raw material conveying section

The raw material limestone is unloaded into the hopper by a forklift or incoming truck, and then the bar valve under the hopper is opened.
The raw material falls into the belt conveyor and is transported to the bucket elevator. After being lifted, it enters the limestone storage bin. This can achieve the purpose of uniform feeding.

The second stage---grinding and powder selection section

The raw materials fall from the storage bin to the metering belt conveyor. After removing the iron through the self-unloading iron remover, they enter the European mill for grinding. The ground materials are sorted by the separator through the wind force, and the finished products that meet the requirements are selected. The powder is collected and temporarily stored by the cyclone collector.

The third stage --- finished product storage and transportation section

The finished powder temporarily stored by the cyclone collector is transported to the finished product warehouse by conveying equipment and elevators for storage for later use in the tanker truck.
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