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First grind and second bake. The largest advantage of this technique, compared with that of “first grind and second bake”, is energy consumption reduction. Large plaster stone shall be ground into powders with diameter less than 0.2mm, which increases the specific surface when calcining, enlarges the contact area with heat medium, improves calcination heat exchange efficiency and lowers energy consumption greatly. This equipment has small bulk, large production capacity, and simple structure and is hard to destroy. Analysis on technique features: I. Concept of technique Crusher grinds large gypsum into small granules less than 25mm. After storage and measurement with weigh belt, transfer them into Raymond mill for milling. Transfer qualified calcined gypsum powder to clinker bin for storage or to board-manufacturing workshop for usage. II. Technique’s advantages: １．Features of first grind and second bake: Compared with that of first grind and second bake, the largest advantage of this technique is great energy consumption reduction. The reason lies in: great plaster stones are ground into powders with diameter less than 0.2mm, which increases the specific surface when calcining, enlarges contact area with heat medium, improves calcining heat exchange efficiency and lowers energy consumption greatly; the disadvantages are three powder pollution positions in technical process, which shall be solved with dust-removing equipment. ２．Features of two other techniques: First bake and second grind: due to high energy consumption and low production capability of this technique and that the quality of the products is hard to control and is unstable, at present, it is a kind of backward technique and is seldom adopted. Only a few small factories are still applying it. Integration of grind and bake: this technique has good features: low energy consumption, small investment, high efficiency, stable quality of the products and small area coverage. Besides, the dust volume is concentrated and is easy for protecting environment. However, it is not mature at home and only BNBM imported from German one set of Peters-mill, which runs to manufacture thistle board
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III．Operating mode of ebullience calciner: The bed state of gypsum ebullience calciner belongs to bubbling bed so this calciner is called “ebullience calciner”. The calcining part of the ebullience calciner is a standing box-type container with a gas distribution board at the bottom for the purpose of supporting solid powder materials to avoid leakage when stopping running and having the gas from the bottom into lathe evenly during running. Continuous feeding batch feeder is equipped above the upper bound of the bed. There are overflow holes on the furnace wall of the upper bound of the bed, which is used for discharging materials. Many heating pipes are equipped within the beds and the heating media within the pipes are saturated steam or heat oil; the heat is transferred through pipe walls to fluidized gypsum powder outside of the pipe and makes the gypsum powder dehydrate and decompose. One electrical precipitator is equipped on the upper calcination section and the dust brought by gas when leaving fluidized bed shall be collected by the electrical precipitator and return to fluidized bed automatically. The dusted tail gas shall be extracted by extract blower into the air. During normal operation, blast air from the bottom of ebullience calciner and enter into fluidized bed through the gas distribution board. Then the heat pipe flooded within the fluidized bed shall transfer a large amount of heat to materials and have the dehydrate gypsum powders reach the temperature of dehydration and decomposition. The dehydrate gypsum shall dehydrate crystal water in fluidized bed and become steam. The steam mixes with the blasted air at the bottom of ebullience calciner and they move upward through bed. Since the steam is much more than air, the fluidization of the whole bubbling bed is realized by the steam formed from gypsum dehydration. Due to violent tumbling and mixing of powder materials in the fluidized bed, the temperature and components of the materials at all positions of the whole fluidized bed are almost the same. The raw gypsum powder added continuously, once entering the bed, shall immediately mix with the hot powder materials within the bed evenly and quickly dehydrate and decompose in the hot powder. In order to avoid that the raw gypsum is extracted too early before finishing dehydration, the furnace is designed to add a separator to divide the fluidized bed into a large and a small sections. The bottoms of two sections are connected. Raw gypsum enters into the large section firstly and dehydrates most of crystal water; then comes to the small section through the lower part of the passage and completes the final dehydration and overflow the furnace from upper bed automatically
IV. Technical features of ebullience calciner: １．The equipment is delicate and owns a large production capacity. The production capacity of the ebullience calciner is essentially decided by the quantity of heat transferred by heat source through heater wall to the material. Because the material completely realizes fluidization, it is unnecessary to install blending equipment within the ebullience calciner, many heat pipes can be installed with high density so the small-size furnace shall have large heat-transfer area. Besides, the heat source adopted by ebullience calciner is saturated steam or heat oil, their coefficient of heat transfer is one order of magnitude higher than that of hot smoke. The heat transfer equation shows large coefficient and area of heat transfer, which lead to large amount of heat transfer. That is to say that the ebullience calciner has a large production capacity, for example, the diameter of 5T-capaciaty ebullience calciner is 1.3m, while for the diameter of 20T-capacity ebullience calciner, 2m is enough, which is incomparable for other traditional external-heating type calcinin equipment. ２．Structure is simple and hard to destroy. Owing to the fluidization of the materials, rotating parts are not needed and the structure is much simpler, which is convenient for manufacturing and maintenance is not required after put into production. Since the low-temperature heat source is adopted, the furnace shall not be threatened by burning at all events and the equipment has a long service life. ３．The equipment is compact and covers small areas. the ebullience calciner is standing equipment; the dust collector covers the upper furnace body and is integrated with the furnace. The equipment is quite compact so it covers small areas and avoids the dew of the dust collector. ４．Low energy consumption: The heat energy consumption and electricity consumption of the ebullience calciner are low. Heat energy: as to the heat energy transferred from heat source to materials, only a small amount is used to heat the blasted cold air at the bottom of the furnace or is lost from heat dissipation of the furnace body, most heat is applied to the dehydration and decomposition of the materials. The heat efficiency of the furnace is above 95%. Of course, the ebullience calciner uses the secondary heat source and the final heat efficiency shall have the efficiency of the furnace multiplied by the heat efficiency of the boiler. However, the steam boiler or the hot oil boiler is mature thermal equipment and their heat efficiency is relatively high. The heat efficiency of the steam boiler generally can reach to 60-70% and the hot oil boiler can reach to 70-80% (Our company’s program adopts organic heat-transfer material heater). Therefore, the total heat efficiency of the ebullience calciner is relatively high and adopts steam, primary energy, but the heat efficiency is seldom above 50%. At home, the heat consumption index of the ebullience calciner is 7.7*105KJ/t building gypsum. Electricity energy: the ebullience calciner requires no rotating and no blender; the materials realize fluidization mainly by the steam from gypsum dehydration; the required blasted air at the bottom of furnace is very limited; so the power of the air blower is very low and the ebullience calciner requires much less electricity consumption than that of traditional calcination equipment.
Introduction of Sawdust Machine : Sawdust Machine can be crushed logs into sawdust and granular. If you are interested in the Sawdust Machine by us, please Contact us or visit the website of the company for relevant prices and detailed technical parameters and specifications etc. Henan Dafu Mechanical Import and Export Co., Ltd. will assure you of our best service at all time!
Introduction of Timber Crusher: Strong and safe heavy-scale crusher takes single bear as main machinery and crushes thick and large-scale wastes with forceful crusher. The machine will automatically withdraw in the face of strong-toughness substances for preventing machine from damage. It is applicable to all large-scale enterprises?places such as large-scale waste fields of agriculture and animal husbandry industries, etc. If you are interested in the Timber Crusher Machine by us, please Contact us or visit the website of the company for relevant prices and detailed technical parameters and specifications etc. Henan Dafu Mechanical Import and Export Co., Ltd. will assure you of our best service at all time!
Sulfur powder production line Sulfur Mill, mainly used in the production of sulfur powder, the fineness ranging from 60 to 325 mesh. The production made by our company dedicated to grinding mill with closed-end flow and added anti-explosion devices, filling the gas flame retardant. Meanwhile,we add the installation of air filtration devices and cooling devices .So we can guarantee the quality of our products. At the same time, we can provide a full range of production line equipment according to the needs of customers. The device can be mechanized fully. Customers home and abroad are weclome. Sulfur Mill is a air-milling machine with a full-circle closure. Before the mill machine works, the fire-retardant gas (nitrogen) are filled to replace with the air inside. After the access of materials, the fire-retardant gas are supplemented continuously to prvent the burning of the sulfur powder. The cooling filtration system is adopted in this equipment, so that the temprature can be controled at the rangement of 18 to 22℃. Because the sulfur powder can become soft while being heated, which could affect the output of sulfur. After being cooled ,the sulfur powder can be seperated easily, the function of filtration system is to control the content of sulfur powder in the refluxing air. Closure air system is adoptted both in feed and output of the machine to prevent air to flow and fire-retardant gas overflow. Raw materials are transported to raw materials warehouse by conveyor belt, then are put into the mill to crush by closed-air feeder which is at the bottom part of raw materials warehouse. Closed-air feeder can not only prvent the air from entering, but also control the feeder rate. After the powder is made, the air-closed feeder will sent the powder to the air conveyor. Then the powder is sent into the product storehouse by air conveyor. The powder is packed quantitatively by Automatic Packing Machine which placed at the bottom of the product storehouse. Finally the packed powder is transferred to the storehouse. The main engine current of electric control cabinet should be paid attention to when adjusting the flow of Automatic Feeder. Working electric current and motor rated current should match, so as to avoid the mill over loaded. The other point which should be paid attention to is the air inflow of flame retardant (0.2 m3/3 ton). Low content of flame-retardant air will cause to burn
China manufacturing industries are full of strong and consistent exporters. We are here to bring together China factories that supply manufacturing systems and machinery that are used by processing industries including but not limited to: stone crusher, mining machine, crusher machine. Here we are going to show you some of the process equipments for sale that featured by our reliable suppliers and manufacturers, such as Stone Crushing Machine. We will do everything we can just to keep every buyer updated with this highly competitive industry & factory and its latest trends. Whether you are for group or individual sourcing, we will provide you with the latest technology and the comprehensive data of Chinese suppliers like Stone Crushing Machine factory list to enhance your sourcing performance in the business line of manufacturing & processing machinery.
Concrete Batching Plants are used for manufacturing of high-quality concrete in a variety of construction applications, like buildings, roads, bridges, airports and many others. MEKA offers a wide range of Ready Mix Concrete Batching Plants along with MEKA Concrete Mixers. Mobile, Compact and Stationary rmc plants can be configured as special solutions for different kinds of concrete types, like Roller Compacted Concrete, Road Concrete, Extra Heavy Concrete, Fiber Reinforced Concrete and others, according to the customers’ specific requests. Single Shaft, Twin Shaft and Planetary Concrete Mixers will cover a wide range of needs and add flexibility to manufacturing process. MEKA also offers different components and options for concrete industry that increase performance, add flexibility, improve accountability and operational characteristics
Used Concrete Plants for sale From Central Mix Plant and Concrete Batch Plant to Concrete Plant, you can buy and sell Concrete Plants at IronPlanet from any and all manufacturers, including Al Takamol, CemenTech, Right Manufacturing, Vince Hagan and more. If you are looking for a Concrete Plants, check out our upcoming heavy equipment auctions to find used Concrete Plants for sale
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