Powdery material cyclic calcining system

Abstract

The invention discloses a powdery material cyclic calcining system which comprises a raw material inlet pipeline, a combustion chamber, a calcining decomposition pipeline, a cyclone, a cooling cyclone; a secondary air duct, a screening device and a conveying device, wherein the upper part of the raw material inlet pipeline is connected with a preheating pipeline; the combustion chamber is connected with the upper part of the preheating pipeline; an inlet of the calcining decomposition pipeline is communicated with the top of the combustion chamber; an inlet of the cyclone is connected with an outlet of the calcining decomposition pipeline; the top of the cyclone is connected with an exhaust duct; a discharge opening and a first air locking discharging device are arranged at the bottom of the cyclone; the first air locking discharging device is connected with a three-way pipe; another two ports are respectively connected with a second air locking discharging device and a third air locking discharging device; the third air locking discharging device is connected with the raw material inlet pipeline; an ascending pipe of the cooling cyclone is connected with the lower end of the raw material inlet pipeline; a discharge opening and a fourth air locking discharging device are arranged at the bottom of the cooling cyclone; the second air locking discharging device is connected with an inlet of the cooling cyclone; the secondary air duct is connected to the inlet of the cooling air duct; the screening device is arranged below the fourth air locking discharging device; and the conveying device is arranged below the screening device. According to the powdery material cyclic calcining system disclosed by the invention, calcining equipment for the powdery materials has the function of circularly combusting and decomposing; and finally, a powdery material calcining system can be used for stably producing qualified products.

Description

technical field [0001] The invention relates to powder calcining technology, in particular to a powder material circulation calcining system. Background technique [0002] At present, the production methods of powdered materials (such as: powdered CaO, powdered CaO·MgO, powdered MgO) are all obtained by crushing calcined large-grained block materials, that is, firstly, by rotary kiln, sleeve Kilns, shaft kilns and other equipment produce large-grained block materials, which are then crushed and screened by various crushing equipment to obtain powder materials that meet the requirements of the next process. This type of method for obtaining powdery material has the following disadvantages: [0003] 1. Its production equipment is not specially designed for powdered quicklime, so it needs to be supplemented by the subsequent crushing process, which often consumes high energy consumption and consumes valuable lump material resources. [0004] 2. Rotary kilns, sleeve kilns, sha...

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Problems solved by technology

[0003] 1. Its production equipment is not specially designed for powdered quicklime, so it needs to be supplemented by the subsequent crushing process, which often consumes high energy consumption and consumes valuable lump material resources

[0004] 2. Rotary kilns, sleeve kilns, shaft kilns and other equipment can only use larger particles as raw materials, and cannot use fine particle materials as raw materials, and a large amount of fine particle materials will be produced in the process of mining, transportation and mineral processing. Therefore, raw material resources cannot be fully and effectively utilized

[0005] In addition, there is another device that uses a process in which multi-stage cyclones are connected in series. Although it has the advantage of sufficient preheating, it also has the disadvantage of complex system.

There is also a process that can only make the material move in one direction in the system, and its calcination time is relatively fixed, and the decomposition rate cannot be further improved.

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