Semi-coke drying device

Abstract

The invention relates to the technical field of semi-coke drying, in particular to a semi-coke drying device. The semi-coke drying device is provided with an outer shell, a feeding opening is formed in the top of the outer shell, a discharging port is formed in the bottom of the outer shell, a plurality of independent drying chambers are arranged inside the outer shell, the periphery of each drying chamber is provided with a ventilation passage, and each ventilation passage is internally provided with an upper air inlet way, a middle air return way and a lower air inlet way from top to bottomin sequence, wherein the sides, in contact with the drying chamber, of the upper air inlet way, the middle air return way and the lower air inlet way are all provided with air dividing holes, and thedrying chamber communicates with the ventilation passage through the air dividing holes; air outlets are formed in the outer shell and located above the drying chambers; and a discharging control device is installed at the bottom of each drying chamber, a discharging hopper is installed at the bottom of the outer shell and located below the discharging control devices, the bottom of the discharging hopper is provided with a production discharge pipe and a fault discharge pipe, and switching valves are arranged on the production discharge pipe and the fault discharge pipe. The semi-coke dryingdevice has high drying efficiency and good production safety, and is suitable for the improvement of an existing semi-coke drying device.

Description

technical field [0001] The invention relates to the technical field of semi-coke drying, in particular to a semi-coke drying device. Background technique [0002] Semi-coke is widely used as a reducing agent in submerged arc furnaces, such as calcium carbide, ferroalloy, ferrosilicon, etc. In use, it is required to maintain a certain particle size so that the CO gas generated after reduction can escape without focusing in the material; at the same time, the semi-coke used as the reducing agent should have a low moisture content to avoid or reduce the moisture content in the submerged arc furnace. A large amount of electrolysis produces H2 and O2. (The decomposition of water in the submerged arc furnace is a side reaction, which not only greatly increases the power consumption, but also generates a large amount of O2 gas, which easily makes the gas produced by reduction reach the explosion limit. Take the production of calcium carbide as an example: the main raw materials of...

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Problems solved by technology

Another form is a vertical dryer, which is a cylindrical structure, and the interior consists of several parts such as cloth, preheating, drying, and cooling. After the wet blue charcoal is sent into the drying chamber by the distributor, it will Slowly moving downwards, the hot air from the outside is in contact with the wet blue charcoal to take away the moisture to achieve drying. This kind of dryer has the following problems in use: 1. The dryer cannot be enlarged, and the cylindrical structure cannot be raised infinitely. At the same time The increase of the diameter makes the distribution of the material problematic; 2. The material is accumulated in the drying chamber, and the material in the middle and lower part is under greater pressure and is easily crushed, which affects the particle size; 3. If the drying medium entering the drying chamber Without quenching and tempering treatment, the fire risk of the materials in the drying chamber will be increased. Once the existing cylindrical vertical dryer catches fire, it will form a chimney effect, making the fire uncontrollable, resulting in irreparable damage. Consequences, at the same time, the design of the drying system cannot achieve perfect fire prevention and disposal measures; 4. The materials in the cooling chamber are cooled by stacking, and the high-temperature materials after drying are in contact with high-oxygen natural wind, which is very easy to burn and cause fire. Risk; 5. The hot air is distributed in the cylinder from the cross-section circumference. The temperature of the upper, middle and lower parts of the cylinder is not easy to control. The smoke only passes through the semi-coke layer once and then is discharged to the atmosphere from the air-inducing pipe, which improves the drying efficiency. higher overall energy consumption

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