What is waste dryer?
Waste dryer can handle the slag with water content of about 70-80% to do dry treatment, in order to reduce the water content of the slag to 40-50%, so as to reduce the amount of external discharge and save the cost of external disposal of the slag. The purpose is to reduce the water content of slag, reduce the amount of slag to be disposed of, thus reducing the cost of slag disposal for the enterprise and improving economic efficiency.
Composition of waste dryer
The waste dryer
contains waste drying facilities
and related waste receiving system
, conveying system, exhaust gas treatment system and control system; the main process flow is: wet waste silo + screw conveying + hollow double screw paddle waste dryer + dry waste conveying + exhaust gas treatment. Its daily processing capacity is 2 tons, and low-pressure saturated steam is used as the heat source. It has corresponding self-emptying measures and heat preservation measures when the equipment is shut down, and the heat preservation adopts 80mm rock wool and aluminosilicate heat preservation layer with carbon steel plate cladding.
Working principle of waste dryer
The hot air of waste dryer machine enters the bottom of the dryer tangentially and forms a powerful rotating wind field driven by the agitator. The paste material enters the dryer by the spiral feeder, and under the strong action of the high-speed rotating stirring paddle, the material is scattered by the action of impact, friction and shear force, and the lump material is quickly crushed and fully contacted with the hot air, heated and dried. After dehydration of dry materials with the hot air flow up, grading ring will be large particles retained, small particles from the center of the ring discharged outside the dry exploder, recovered by the cyclone separator and dust collector, not dry or large pieces of material by centrifugal force thrown to the wall of the apparatus, fall back to the bottom to be crushed and dried.
Feature of waste dryer
a. Large heat transfer area, compact structure, small floor space.
b. High utilization of heat energy, low energy consumption, the loading volume can reach 70~80% of the cylinder volume, due to indirect heating, there is no large amount of carrying air to take away heat, and the outer wall of the sludge dryer is set up with insulation layer, evaporating 1kg of water only needs 1.2kg of water vapor when sludge drying in water treatment.
c. The wedge-shaped paddle has the ability of self-cleaning, which can improve the heat transfer effect of the paddle.
d. Material applicability is wide, using different heat media, can deal with heat-sensitive materials, and can also deal with materials that need high temperature drying. Commonly used media include: water steam, heat-conducting oil, hot water, cooling water, etc. Rotary sludge dryer can be operated continuously or intermittently, and can be applied in many fields.
e. The operation is stable and the product is evenly dried. Due to the special swelling and stirring effect of the wedge-shaped paddle, the material is fully in contact with the heat transfer surface, which makes the temperature, humidity and mixing gradient of the material in the axial zone very small, ensuring the stability of the process.
f. Low operating costs, the normal operation of the equipment requires only one person, low-speed mixing and reasonable structure. The amount of wear and tear is small, and the maintenance cost is very low.
Applicable materials of waste dryer
|Organic matter||Atrazine (pesticide insecticide), lauric acid isolate, sodium oxalate, benzoic acid, fungicide dan, cellulose acetate, organic pigments, etc.
|Dyes||Anthraquinone, titanium hydroxide, black iron oxide, indigo pigment, butyric acid, zinc sulfide, various azo dyes intermediates.
|Inorganic substances||Borax, hydroxide, copper sulfate, calcium carbonate, barium carbonate, antimony trioxide, iron oxide, various metal hydroxides, various heavy metal salts, synthetic cryolite, etc.
|Food stuff||Soy protein, gelling starch, wine trough, wheat sugar, wheat starch, etc.
Application of waste dryer
The waste dryer is especially suitable for wet materials with large moisture content, paste-like wet materials, and materials that cannot be dried by other airflow drying methods, such as: copolymers of vinyl acetate and vinyl chloride, acetate flocculent, catalyst, C, M, C, CT-1 resin, calcined gypsum, electrolytic manganese dioxide, anthraquinone sulfonic acid ammonium salt, fluorite, diatomaceous earth, silica gel catalyst, bone powder, potassium perchlorate sulfonium Class drug, synthetic resin, active gluten, active white clay, chemical filter cake, rutile titanium dioxide, sebacic acid, copper sulfate, aluminum sulfate, sodium sulfate, calcium phosphate, phosphate esterified starch, dyes, calcium citrate, coal sludge, clay, clay cement, aluminum hydroxide, barium hydroxide, calcium lactate, food, melamine, gypsum slurry, lime, biological products, carbon black, calcium carbonate slurry, sludge residue, organic chemicals Aluminum stearate, iron oxide, organic fuel, corn protein feed, cloudy wet slurry, mica powder, pharmaceuticals, pigments, potassium dichromate pulp, wine lees slag, etc.
a. Using heat-conducting oil as the heat medium, the paddle dryer can complete the low-temperature calcination work, for example, calcium sulfate dihydrate (Ca2SO4-2H2O) calcination into calcium sulfate hemihydrate (Ca2SO4-1/2H2O).
b. Through the cooling medium, such as water, cooling brine, etc. can be used for cooling. For example: the paddle cooling machine used in the soda industry, replacing the old air-cooled cooling machine, saving energy and exhaust gas treatment equipment, reducing operating costs, can also be used for titanium dioxide, nickel-iron alloy powder and various powder and granular material cooling. In a single machine can cool the material from 1000 ℃ to less than 40 ℃.
c. Waste drying is the main function of this equipment. In drying, no hot air is used, making solvent recovery, energy consumption, and environmental control in an ideal state that is easy to handle. It is especially suitable for solvent recovery, flammable and oxidizable heat-sensitive materials. Has been widely used in fine chemicals, petrochemicals, dyestuff industry.
d. The uniformity of temperature, humidity and mixing in the axial interval makes the equipment available for heating or melting, or for some solid material reactions. Waste drying machine has been successfully used in compound fertilizer and modified starch industries. The paddle dryer for sludge can be used to sterilize Food and flour sterilization. The large heating area per unit effective volume quickly heats the material to the sterilization temperature, avoiding long time heating and changing the quality of the material.
|Petrochemical industry||Polyolefin powder, polycarbonate resin, high-and-low-density polyethylene, linear low-density polyethylene, polyacetal particles, nylon 6, nylon 66, nylon 12, acetate fiber, polyphenylene sulfide, propylene-based resin, engineering plastics, polyvinyl chloride, polyester, polyformaldehyde, polyvinyl alcohol, polystyrene, polyformaldehyde, ethylene ~ propylene copolymer, styrene ~ acrylonitrile copolymer.
|Environmental protection industry||PTA pharmaceutical plant waste residue, electroplating downstream pharmaceutical plant waste residue, boiler soot, pharmaceutical plant waste residue, sugar plant waste residue, MSG plant waste residue, coal ash.
|Food industry||Starch, cocoa beans, corn grain, table salt, modified starch, pharmaceuticals.
|Chemical industry||Soda ash, nitrogen, kaolin, bentonite, white carbon black, carbon black, phosphogypsum, phosphorus and potassium compound fertilizer, sodium fluoride oxide, calcium nitrate, magnesium carbonate, sodium cyanide, aluminum hydroxide, barium sulfate, calcium sulfate, calcium carbonate, dyestuff, molecular sieve, saponin.
Use of waste dryer
a. Open the steam valve.
b. Shake the wind shutter with the handle before starting the machine, and then start the wind shutter motor after the hand can turn easily.
c. Start the motor to reach normal operation, about 5 minutes of start to make each pipe preheat.
d. When the inlet air temperature reaches the predetermined temperature, the charging motor will start and the speed adjusting button can be rotated to add material slowly, when the inlet air temperature reaches the highest temperature that the material can bear, it can be adjusted to the fixed amount of material, when adjusting the speed, note that the material cannot be added too fast to avoid filling the material.
e. When the steam pressure and material moisture content change, the filling speed should be adjusted accordingly, mainly to meet the drying requirements of the finished material. The water content of the material should be in line with the requirements of the dryer.
f. Please refer to the instruction manual of the fan for installation, commissioning and maintenance of the fan.
g. There are dischargers under the two cyclone separators, and the bag filter has a small amount of material collection, so it is discharged regularly.
h. If the cyclone is blocked, it should be shut down to clear the dust inside the wind breaker and then turn on the machine. If the wind machine is running normally and no material, there may be wet material blocked in the cyclone separator outlet, then it should be stopped to clear.
How to order waste dryer?
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