Active lime calcining system with precalciner and active lime calcining method
A technology of precalcining furnace and active lime, which is applied in the direction of furnace, furnace cooling, rotary drum furnace, etc., can solve the problems of high heat dissipation on the surface of the rotary kiln shell, increased system energy consumption, and low thermal efficiency, so as to improve the precalcining rate, Improve heat transfer efficiency and reduce heat consumption
Active Publication Date: 2012-07-25
CITIC HEAVY INDUSTRIES CO LTD +1
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Problems solved by technology
However, the calcination of limestone in the rotary kiln is mainly radiative heat transfer with low thermal efficiency, and the surface heat dissipation of the rotary kiln cylinder is too large, resulting in increased energy consumption of the system
Therefore, the heat consumption of the process is higher
Method used
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[0015] figure 1 An active lime calcination system 100 according to the invention is shown, comprising a precalciner 10 and a rotary kiln 20 . Among them, the limestone raw material 5 is supplied to the precalcining furnace 10, where it is precalcined under the action of high-temperature flue gas. The material 15 containing precalcined limestone is fed from the precalcined furnace 10 into the rotary kiln 20 so that the remaining undecomposed limestone continues to be calcined in the rotary kiln 20 . The active lime 25 formed is finally exported. Exhaust gases 8 are discharged from the precalciner 10 .
[0016] The active lime calcination system 100 may also include a cooler, such as a shaft cooler 30 . Therefore, the high-temperature activated lime 25 from the rotary kiln 20 is sent to the vertical cooler 30 to be quenched to below 100°C.
[0017] In addition, the active lime calcination system 100 may further include a rotary kiln burner 40 for generating high-temperature ...
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Abstract
The invention provides an active lime calcining system. The active lime calcining system comprises a precalciner and a rotary kiln, wherein the precalciner is employed to receive a to-be-calcined limestone raw material and precalcine the limestone raw material; and the rotary kiln is employed to receive a material containing precalcined products from the precalciner, output the formed active lime and provide a first flue gas to the precalciner in the meantime. The calcining system further comprises a precalciner combustion device, which is employed to generate a second flue gas and provide the second flue gas to the precalciner, so that the limestone raw material can be precalcined under the effects of the first flue gas and the second flue gas in the precalciner. Therefore, precalcining ratio of the limestone raw material in the precalciner is significantly improved. The heat exchange manner in the precalciner is essentially high-efficiency heat convection, so that the heat exchange efficiency of the whole system is improved, and the heat consumption of the system is reduced.
Description
technical field [0001] The invention relates to an active lime calcination system, in particular to an active lime calcination system comprising a rotary kiln. The invention also relates to an active lime calcination method. Background technique [0002] At present, the calcination of active lime mainly includes two processes, that is, the process of using gas-fired shaft kiln and the process of using rotary kiln with preheater. In the first process, although the heat consumption of calcination of active lime is low by using a gas-fired shaft kiln, most of the limestone to be used are large pieces of more than 40 mm, and the utilization rate of the mine is low. In addition, the activity of active lime calcined by this process is relatively low. [0003] In the second process, using a rotary kiln with a preheater to calcine active lime has relatively high activity and stable quality, and can utilize 10-40mm fine-grained limestone. Therefore, this process has been widely us...
Claims
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IPC IPC(8): C04B2/10
CPCF27D2009/0002C04B2/02C04B2/10F27D9/00F27B7/2016
Inventor 王继生张凯博乔斌朱雯姜琳
Owner CITIC HEAVY INDUSTRIES CO LTD