All the parameters you want to know about the grate cooler are here
Date：2019-09-03 16:04 Source：cementepcViews:
Grate cooler is mainly composed of grate bed part, transmission part, housing, air cooling system, zipper machine and crusher parts.
Determination and selection of main parameters
1. Determination of grate bed load:
Grate cooler grate bed unit area output is known as the grate bed load, grate bed load, from the material layer thickness, high output, on the other hand, thin material layer, low output.Grate bed load is generally determined according to experience.Heavy material layer cooling machine for pre-decomposition kiln, its load can reach 1.5-1.8t /(m2·h)
2. Determination of material layer thickness:
The thickness of the layer depends on the grate load and the residence time of the clinker in the cooler, which is usually 15-30mm.In the high temperature area of the cooling machine, in order to improve the heat exchange efficiency and cooling efficiency of the cooling machine, thick material layer technology has been popularized at present, whose thickness reaches about 600mm.In the grate bed in the low temperature zone of the cooler, the thickness of the layer is controlled at 200-300mm, and the thickness of the layer in the high temperature zone is 2-3 times higher than that in the low temperature zone.Using thick layer technology in high temperature area, the thermal efficiency can be increased by about 10%, the cooling efficiency can be increased by about 15%, and the thick layer technology also plays a role in protecting the grate bed of grate cooler.
3. Determination of grate bed width:
The width of grate bed is determined according to the output and diameter of kiln.Grate bed is too wide, cloth difficult, clinker distribution is not uniform, resulting in uneven resistance of the material layer, the middle part of the material layer thick, thin on both sides of the material layer, local areas appear grate plate and wind blowing phenomenon, thereby reducing the wind gentle thermal efficiency of secondary wind.The grate bed of the grate cooler is too narrow, will make the material layer too thick, cooling difficult, at the same time make the grate bed too long, generally the entrance grate is narrower than the cold end grate bed.In the actual design, blind plates without grate holes are arranged on both sides of the grate bed, which can neither pass through air nor push clinker, so as to adjust the width of the grate bed.
4. Determination of grate bed length:
The length of grate bed is determined according to the output, the grate load and the width of grate bed.
5. Installation location determination of the cooling machine:
When the clinker leaves the mouth of kiln, the distance of clinker falling off will increase with the increase of rotary kiln speed.In order to prevent the phenomenon of clinker falling off, the center line of grate bed and the center line of rotary kiln should be deviated when the cooler is installed.Offset distance e=(0.1 -- 0.15)D(D is kiln body diameter).The deviation value of general kiln is small, and the pre-decomposition kiln is large.
6. Segmenting and slope of grate bed:
The segmental number of grate bed of grate cooler is related to the output of kiln, which is less than 1000t/d.The grate bed can be divided into two sections for 1000-2000t /d;The grate bed can be divided into two or three sections for 2000-3000t /d;If the output exceeds 3000t/d, the grate bed of grate cooler can be divided into three to four sections.For the high output cooling machine, horizontal grate bed is adopted in other sections when the first section is inclined.The slope of grate bed should not be too large, otherwise the height of the cooling machine will be too high.
7. Selection of wind pressure and air volume:
The determination of fan air volume and wind pressure depends on the grate layer thickness and clinker temperature above each air chamber, that is, the air pressure is determined according to the grate resistance (including grate resistance and material layer resistance), the air volume is determined by the clinker volume and temperature cooled in each chamber.
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