Rotary kiln waste heat recovery apparatus

Abstract

The invention discloses a novel rotary kiln waste heat recovery apparatus. The apparatus is characterized in that the apparatus comprises a rotary kiln body, a circulating pipeline is connected to the rotary kiln body, and the end of the circulating pipeline is connected to a waste heat recovery device; the waste heat recovery device comprises a recovery chamber, and baffle plates are arranged in the recovery chamber in cross arrangement; the recovery chamber is also provided with a heat exchange pipeline which is folded along the baffle plates; the end of the heat exchange pipeline is connected to a sodium sulfite drying case; the end of the recovery chamber is provided with an air outlet, the air outlet is connected to an exhaust gas filtering apparatus, the exhaust gas filtering apparatus comprises a filtering pipeline which is provided with at least three pieces of baffle plates, the baffle plates are arranged in up and down cross arrangement, settlement buckets which are arranged at the bottom of the filtering pipeline and between adjacent two baffle plates are used for communication, and cross section of the filtering pipeline over the settlement bucket is larger than cross section at an inlet of the filtering pipeline. The recovery apparatus has a simple structure, can be used for recycling and reusing heat in the rotary kiln exhaust gas, and the heat can be used for directly drying a sodium sulfite product.

Description

technical field [0001] The invention belongs to the field of strontium salt production, and in particular relates to a rotary kiln waste heat recovery device. Background technique [0002] At present, the process of producing strontium carbonate by reduction method is as follows: firstly, the lapis lazuli is broken into small pieces, then mixed with white coal (or coke), ground into fine powder, sent to the roaster, and reduced and roasted at 800-1400°C, the lapis lazuli The strontium sulfate in the coal reacts with the carbon in the white coal to form strontium sulfide. Strontium sulfide is easily soluble in water. Strontium sulfide is converted into strontium hydroxide and strontium hydrosulfide through leaching process, and then converted into strontium carbonate and hydrogen sulfide through carbonization reaction with carbon dioxide. [0003] Now the roasting of strontium sulfate and white coal is mainly carried out in a rotary kiln, and a fan is used to blow coal powde...

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Problems solved by technology

[0003] Now the roasting of strontium sulfate and white coal is mainly carried out in the rotary kiln, and the coal powder is blown into the burner of the rotary kiln by a fan, and the other end of the rotary kiln is used as the outlet of the exhaust gas, and the exhaust gas produced in the rotary kiln also contains a large amount of If the waste gas is discharged directly, it will cause waste of energy and pollute the environment

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