Method and system for calcining dolomite in a regenerative energy-saving double-chamber shaft kiln
A technology for calcining dolomite and a double-chamber vertical kiln, which is applied in the field of kiln calcination, can solve problems such as uneven heat distribution, achieve significant energy saving effects, reduce labor intensity, and save manpower
Active Publication Date: 2021-11-09
垣曲县五龙镁业有限责任公司
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Problems solved by technology
[0004] In order to overcome the deficiencies of the prior art, the present invention provides a method and system for calcining dolomite in a regenerative energy-saving double-chamber shaft kiln. distribution structure, control the flow of gas, improve the quality of materials before entering the furnace, meet the requirements of calcined white cooling on the temperature and humidity of dry air, optimize the process flow of each link, in order to achieve qualified calcined white production, improve calcined white pass rate and product quality. Target
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Embodiment 1
[0039] A method for calcining dolomite in a regenerative energy-saving double-chamber vertical kiln. The qualified dolomite after screening, with a particle size of 45mm-90mm, is weighed by the weighing hopper under the kiln, and the dolomite is discharged by a single-bucket elevator. The dolomite is lifted to the middle silo on the top of the kiln, and the dolomite is fed to the weighing hopper on the two kiln barrels through a vibrating feeder and a reversible belt conveyor in turn, and then the dolomite is evenly fed into the kiln through the feed valve and the distributor. Inside. A mechanical level gauge is installed on the top of each kiln barrel to detect the height of dolomite in the kiln barrel. After entering the kiln, the dolomite is preheated to over 800°C by the high-temperature gas discharged from the calcination kiln chamber, so that the dolomite is partially decomposed. The calcining kiln chamber is adjusted to the exhaust kiln chamber every certain period, an...
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Abstract
The invention discloses a method and system for calcining dolomite in a regenerative energy-saving double-chamber shaft kiln, which comprises the following steps: commissioning, preparation and loading of the double-chamber shaft kiln and related auxiliary equipment, and continuous operation of the unloading device during the process; After the loading is completed, ignite and carry out the kiln drying with materials. During the kiln drying process, the feeding and unloading devices are in continuous operation; the production system starts and the calcination is interspersed with the ignition and kiln process, including calcination, reversing, batching, feeding, There are several steps of ash discharge and ash discharge. The batching process is interspersed between reversing and calcination. The double-chamber shaft kiln is calcined while reversing. It is for calcining the kiln chamber; the feeding is interspersed in the reversing, and the process of unloading ash is carried out at the same time as the reversing; the ash is discharged to obtain the product calcined white material. The method improves the phenomenon of uneven heat distribution in the calcining process, optimizes the process flow of each link, and improves the calcined white pass rate and product quality goals.
Description
technical field [0001] The invention discloses a method and system for calcining dolomite in a regenerative energy-saving double-chamber shaft kiln, belonging to the technical field of kiln calcining. Background technique [0002] The magnesium metal smelting field has very strict requirements on the quality of calcined white. In actual production, it is required to do a raw burning test every 2 hours, and an ignition reduction test every 4 hours. The burning reduction is ≤0.5, and the raw burning requirement is zero. [0003] At present, regenerative energy-saving double-chamber shaft kilns are mostly used for calcination of lime. The calcined white used for magnesium metal requires higher quality. It is much more difficult to produce calcined white by calcining dolomite in a vertical kiln than lime. The main problem brought about in the calcination process is that the heat distribution is not uniform. Some calcined whites on the same cross-section have been seriously over-...
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IPC IPC(8): C04B2/12
CPCC04B2/12
Inventor 董昺
Owner 垣曲县五龙镁业有限责任公司