Sleeve-type gas-burning shaft kiln

Abstract

The invention discloses a sleeve-type gas-burning shaft kiln. An annular furnace chamber is defined by an inner cylinder body and an outer cylinder body which are sleeved together in a kiln body; the cylinder wall of the inner cylinder body is provided with a plurality of vent holes which are communicated with the annular furnace chamber and the inner cavity of the inner cylinder body; the annular furnace chamber is sequentially provided with a preheating area, a calcining area and a cooling area from top to bottom; a cylindrical furnace shell also covers the periphery of the outer cylinder body; a peripheral gas passage is defined between the inner wall surface of the cylindrical furnace shell and the outer wall surface of the outer cylinder body; vent holes which are communicated with the annular furnace chamber and the peripheral air passages are distributed on the cylinder wall of the outer cylinder body; the inner cavity of the inner cylinder body and the peripheral air passages are axially provided with radial separating structures along the kiln body alternatively in a staggered mode, wherein the radial separating structures are used for driving air flows in the kiln body to pass through the annular furnace chamber, enter the inner cavity of the inner cylinder body and the peripheral air passages and rise in a turning mode; the middle part of the inner cavity of the inner cylinder body is provided with a calcining chamber corresponding to the calcining area in the annular furnace chamber in a separation mode through two layers of radial separating structures which are arranged axially along the kiln body at intervals; and the calcining chamber is internally communicated with a high-temperature gas conveying pipe or a fuel gas conveying pipe.

Description

technical field [0001] The invention belongs to the technical field of high-temperature calcination production of materials such as lime and metal magnesium, and specifically relates to a vertical calcination kiln. Background technique [0002] With the development of the metallurgical industry and the continuous improvement of calcination technology and process, my country has put forward higher requirements for the quality of magnesium metal and lime, the main slagging agent in steelmaking production. Existing calcining kilns mainly include earthen kiln, rotary kiln and shaft kiln. The earth kiln has low production efficiency and heavy pollution. The lime produced by it has high impurity content and low activity. Its products are mainly used in the construction field and have been banned for use at present. The rotary kiln equipment is large in size, occupies a large area, and consumes energy. higher. Shaft kilns are also called shaft kilns. In the 1980s, shaft kilns wer...

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Problems solved by technology

Compared with the shell kiln of Beckenbach, the structure of this vertical continuous calcining lime kiln has been greatly simplified, but this vertical continuous calcining lime kiln can only process block stones with large shape and volume, while for small powder If the powdery or granular stone is used, it cannot be calcined, otherwise the powdery or granular stone will enter the hot air outlet channel from the vent hole on the hot air outlet channel due to the action of the flame ejected from the burner port, resulting in a large amount of waste of raw materials. Moreover, in the process of calcining lime, if the combustion airflow injected from the burner port is too large, it will easily cause air resistance to block the falling of raw materials, so that the continuous production of the lime kiln will not be possible, and the production efficiency of the lime kiln will be reduced. It will cause some raw materials near the outer wall of the hot air inlet and outlet channel to be burned, which will affect the product quality; at the same time, because the burner sprays flames horizontally, the gap between the outer layer material near the burner and the inner layer material near the hot air inlet and outlet channel in the annular furnace cavity The temperature between them is not balanced, the outer material is easily over-burned by high-temperature flame calcination, while the inner material is less affected by the flame and easy to burn, which affects the quality of the product.

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