13results about "Lime production" patented technology

The application discloses a low-ash-consumption converter smelting method, adopts single-slag smelting, controls the converter scrap steel ratio in 8% to 26%, controls the top blowing oxygen supply flow in 3.0 to 4.0 Nm 3 / (min·t), controls the bottom blowing argon flow in 0.03 to 0.10 Nm 3 / (min·t); the smelting process is improved by the cooperation of the gun position and the charging; the solid waste slag is added in the converter blowing process, the content of CaO in the slag is controlled in 45% to 55%, and the content of MgO is controlled in 5.5% to 7.5%; meanwhile, the dust removal pressure ball is added to improve the activity of FeO in the slag, and the terminal carbon content of the converter is controlled to be less than or equal to 0.05%. By adding the solid waste slag in the smelting process, the slag needed to oxidize a large amount of iron elements to generate FeO is reduced, so that the total iron content of the slag is reduced; by adding the synthetic slag, the liquidity of the slag is ensured, and the carbon-oxygen reaction is promoted; the total iron content of the low-carbon steel converter terminal slag is stably controlled to be less than 14.5%, the metal yield is provided; the lime addition amount can be reduced, the lime addition amount is controlled to be less than or equal to 10 kg / t, and the cost is reduced.

The application discloses a material uniform distribution device of a lime calcining kiln and relates to the technical field of lime calcining equipment. The material uniform distribution device of the lime calcining kiln, in the device, the change of the incoming material quantity directly drives the adjustment of the inclination angle of the distribution plate, when the incoming material quantity is too large, the distribution plate increases the inclination range, speeds up the falling and spreading speed of the material, and avoids the accumulation of the local material in the kiln, when the incoming material quantity is too small, the distribution plate reduces the inclination range, slows down the falling speed of the material, and prevents the sparse distribution of the material, through the real-time linkage of the incoming material quantity and the distribution angle, the distribution plate can uniformly spread the material in the lime kiln, forms a material layer with consistent thickness and uniform distribution, and guarantees the uniformity of the calcining reaction from the source.

This invention provides a method for preparing low thermal conductivity magnesia-alumina spinel bricks for lime kilns, belonging to the field of finished lime kiln refractory bricks. The method uses magnesia and corundum powder in a mass ratio of 90:10 as the main materials, adding 1% Y₂O₃ sintering aid and 4% Mg(OH)₂-Al(OH)₃ sol binder. The mixture is then pressed, fired at high temperature, and cooled in the kiln. During firing, the sol decomposes to generate nano-MgO and Al₂O₃ particles, filling the grain boundary pores and forming a dense, low thermal conductivity magnesia-alumina spinel. Y₂O₃ effectively reduces the firing temperature. This brick is an alkaline, chromium-free material. When used in the combustion zone of a lime kiln, it exhibits excellent kiln lining adhesion and thermal shock stability, reducing kiln temperature by 30–50°C, achieving energy saving, consumption reduction, and extending kiln lining life.

Processes disclosed are capable of converting biomass into high-crystallinity nanocellulose with surprisingly low mechanical energy input. In some variations, the process includes fractionating biomass with an acid (such as sulfur dioxide), a solvent (such as ethanol), and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin; and mechanically treating the cellulose-rich solids to form nanofibrils and / or nanocrystals. The total mechanical energy may be less than 500 kilowatt-hours per ton. The crystallinity of the nanocellulose material may be 80% or higher, translating into good reinforcing properties for composites. The nanocellulose material may include nanofibrillated cellulose, nanocrystalline cellulose, or both. In some embodiments, the nanocellulose material is hydrophobic via deposition of some lignin onto the cellulose surface. Optionally, sugars derived from amorphous cellulose and hemicellulose may be separately fermented, such as to monomers for various polymers. These polymers may be combined with the nanocellulose to form completely renewable composites.

The utility model relates to calcining furnace feeding field discloses a vertical calcining furnace prevents jamming ration screw feed device, including the transmission support frame for bottom support, the top left side fixed connection of transmission support frame has the support connecting rod, the top fixed connection of support connecting rod has the rubbing crusher jar, the inside rotatory connection of rubbing crusher jar has the rotary rod, the bottom fixed connection of rotary rod has first bevel gear, the inside rotatory connection of transmission support frame has the rotary rod, the outside fixed connection of rotary rod has transmission spiral, the left side fixed connection of rotary rod has second bevel gear, the meshing connection between first bevel gear and second bevel gear, the bottom right side fixed connection of rubbing crusher jar has the unloading frame body, the inside mounting of unloading frame body has intermittent unloading subassembly. In the utility model, improve the efficiency of raw material combustion, improve material heating uniformity, improve raw material rubbing uniformity, avoid the jam of spiral.

This application provides an automatic feeding device for a rotary kiln used in limestone calcination. The kiln housing has an installation cavity with an inlet and an outlet. A traction belt is vertically positioned within the installation cavity, with both ends abutting against the inner wall of the kiln housing. A drive mechanism is mounted on the kiln housing and connected to the traction belt. Multiple conveyor plates are hinged at one end to the traction belt. Adjacent conveyor plates, the traction belt, and the inner wall of the installation cavity form a conveying chamber. Material is placed within the conveying chamber. Each conveying chamber can sequentially connect to the inlet and outlet due to the rotation of the traction belt. A stop block is positioned along the conveyor plate's path. Under the obstruction of the stop block, one conveyor plate in the conveying chamber connected to the outlet can be flipped. This application, through the hinged conveyor plates combined with an energy storage device and a stop block, achieves automatic flipping of the conveyor plates at the outlet position, changing the distance between adjacent conveyor plates, preventing material jamming and the formation of "bridging," facilitating material discharge, and improving feeding efficiency.

A method for efficiently manufacturing low-phosphorus molten steel by use of a steelmaking electric furnace, in which slag resulting from melting a solid iron source is effectively separated from molten steel, and thus a unit consumption of lime required to reduce a phosphorus content in the molten steel is reduced. The method includes: charging a solid iron source and an optional molten iron source and melting and heating these raw materials by using electric energy; partly or entirely removing slag generated during the melting; performing dephosphorization by adding dephosphorization flux; and tapping low-phosphorus molten steel thus refined, and in the method, a slag composition ratio being [CaO] / ([SiO2]+[Al2O3]) of the slag to be removed is adjusted to be not less than 0.25 and not more than 0.70.

The application discloses a kind of coal powder double-chamber kiln quick fire hooking and air blowing method, comprising: before the fuel input of No.1 kiln chamber, the coal powder input of No.2 kiln chamber is increased, and the coal powder input of No.1 kiln chamber is maintained unchanged;No.1 kiln chamber is used as combustion chamber, and the kiln is stopped before entering the reversing time;Start the discharge platform to discharge, and implement heat preservation for No.2 kiln chamber;Replace the spray gun;Fill No.1 kiln chamber with stone, adjust the coal powder input to the initial set value, open the kiln, and store heat for the stone in No.1 kiln chamber;When No.1 kiln chamber enters the combustion period, adjust the coal powder input to 30%-50% of the normal value, and send coal powder fuel into No.1 kiln chamber;Repeat the above steps until the spray gun thermocouple temperature of the kiln chamber reaches 600℃, and then restore the fuel input of No.1 kiln chamber;After the quality of the products in both kiln chambers is normal, implement the same operation for No.2 kiln chamber to replace the spray gun.The application can solve the problem of long replacement period of the spray gun in the existing double-chamber kiln, and reduce the waste of resources.

The utility model provides a kind of lime rapid cooling tower, it is related to lime processing technical field, including vertical cooler main part, the upper portion of vertical cooler main part is equipped with feed inlet, the bottom of vertical cooler main part is equipped with discharging cavity, the side of discharging cavity is equipped with air inlet, the bottom of discharging cavity is equipped with discharge port, the inside of feed inlet is provided with screening mechanism, the inside of vertical cooler main part is provided with cooling mechanism, the upper portion of the side of vertical cooler main part is equipped with baffle;By being provided with screening mechanism inside feed inlet, using the cooperation between the fixed hole of screening mechanism, screening plate, reciprocating cylinder, positioning hole, movable rod and extension spring, feed inlet and screening plate can be driven to reciprocate, and then efficient screening treatment is carried out on lime using screening plate, so that the practicality of the cooling tower during use is greatly improved.

The present application relates to a powder production system based on particle size classification of a suspension preheating decomposition kiln, and belongs to the technical field of lime powder production. The system comprises: a classification module that classifies raw powder according to particle size to obtain multiple particle size raw materials; a feeding port configuration module that calculates the batching height of each particle size raw material according to the characteristics of the raw material of the raw powder, and configures the corresponding batching port; a feature determination module that generates the coal injection area characteristics of each particle size raw material according to the batching port; a fuel supply module that configures the coal injection parameters of the multi-point coal injection port according to the coal injection area characteristics of each particle size raw material, with the maximum calcination efficiency as the target; and a control module that controls the execution of the coal injection parameters of the multi-point coal injection port during the calcination of the suspension preheating decomposition kiln until the production of lime powder is completed. The present system realizes sufficient calcination of raw material particles of different particle sizes, and improves the purity and pass rate of finished lime powder.

The application discloses a kind of double-beam lime kiln intelligent combustion optimization control system of coal powder blending combustion, the system includes fuel control loop system, combustion air control loop system and cooling air control loop system, while taking into account single burning and blending burning two working conditions, under the premise of guaranteeing output stability, stable fuel quantity, make kiln body temperature smooth, reach the purpose of saving fuel and stable ash quality;Oxygen content optimization model can optimize the oxygen content required for optimal combustion effect, improve combustion efficiency to realize energy saving and consumption reduction;Automatic adjustment cooling fan, realizes the relative stability of ash temperature and lower suction air beam temperature when output changes, improves the safety of kiln body;Greatly reduce the labor intensity of operator, improve the stability and safety of lime kiln production.

This utility model discloses a base reinforcement device for the hydraulic cylinder of a Maeltz kiln discharge valve, belonging to the technical field of Maeltz kiln discharge valves. It includes a first connecting member, a second connecting member, and a retaining plate. The first connecting member is fixedly welded to the side wall of the discharge valve body and located below the hydraulic cylinder. The second connecting member is welded to the hydraulic cylinder shaft and located above the first connecting member. The bottom of the retaining plate is connected to the first connecting member, and the top is fitted onto the second connecting member. The first connecting member, the second connecting member, and the retaining plate form a stable support structure, effectively dispersing the pressure generated during hydraulic cylinder operation, greatly enhancing the stability of the hydraulic cylinder base, reducing the risk of loosening and breakage of the connection parts, and thus extending the service life of the discharge valve. Moreover, the device has a simple structure, is easy to install, and has strong practicality.

This utility model relates to the field of lime kiln slag cleaning technology and discloses a lime kiln slag cleaning device, including a base, a support block fixedly connected to the top of the base, a motor fixedly connected inside the support block, a planetary gear fixedly connected to the output end of the motor, a turntable fixedly connected to the top of the planetary gear, and a number of threaded grooves opened inside the turntable. This lime kiln slag cleaning device has advantages such as wide application range. It solves the problem that when using slag cleaning equipment to clean the discharge cylinder of a lime kiln, most existing slag cleaning equipment is designed as an integral part of the lime kiln, but the formation of lumps in the discharge cylinder of a lime kiln takes time, thus reducing the frequency of use of the slag cleaning equipment. Furthermore, because the slag cleaning equipment is integrated with the lime kiln, it cannot be used in other lime kilns, thus reducing the practicality of the slag cleaning equipment.