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Method and apparatus for producing quick lime using coke dry quenching facility

A dry fire extinguishing and manufacturing method technology, applied in the field of manufacturing devices, can solve problems such as poor thermal efficiency

Inactive Publication Date: 2021-11-05
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in the above-mentioned conventional quicklime production method, in order to produce quicklime, heat energy for thermal decomposition of limestone needs to be supplied from the outside, and there is a problem of poor thermal efficiency.

Method used

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  • Method and apparatus for producing quick lime using coke dry quenching facility
  • Method and apparatus for producing quick lime using coke dry quenching facility
  • Method and apparatus for producing quick lime using coke dry quenching facility

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Embodiment

[0048] use figure 1 The manufacturing apparatus of the shown structure is carried out under the following conditions of Invention Example 1, Invention Example 2, Invention Example 3, Invention Example 4, and Comparative Example 1 according to the manufacturing method of quicklime using coke dry fire extinguishing equipment of the present invention. work to make quicklime. First, the balance of heat energy when limestone is pyrolyzed to produce quicklime is as follows.

[0049] Consider the following: for CaCO in limestone 3 thermal decomposition reaction (CaCO 3 →CaO+CO 2 ) The required heat is 766kcal / kg-CaO, and the sensible heat of circulating gas after coke cooling is 228kcal / Nm 3 (180°C ~ 850°C). per 1Nm 3 The quicklime that can be produced by the circulating gas is 228 / 766 = maximum 0.297kg-CaO / Nm 3 .

[0050]

[0051] According to the manufacture method of quicklime utilizing coke dry fire extinguishing equipment of the present invention, use figure 1 The equ...

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Abstract

Provided are a method and apparatus for producing quick lime using a coke dry quenching facility, whereby it becomes possible to produce quick lime with good thermal efficiency and in a simple configuration. A heated circulating gas that has been heated by cooling red-hot coke in a coke dry quenching facility is fed to a lime calcination furnace, and lime stone is thermally decomposed with the supplied heated circulating gas in the lime calcination furnace to produce quick lime. A cooled circulating gas that has been cooled by the thermal decomposition of lime stone and heat exchange with the lime stone in the lime calcination furnace is fed to the coke dry quenching facility and is used as a cooled circulating gas for cooling red-hot coke.

Description

technical field [0001] The present invention relates to a method for producing quicklime, and in particular, to a method and apparatus for producing quicklime using exhaust gas from coke dry fire extinguishing equipment. Background technique [0002] In the past, as the production method of quicklime, the usual method is to use shaft furnaces such as Maerz furnaces and sleeve furnaces, and rotary kilns to make limestone (CaCO 3 ) thermal decomposition (CaCO 3 →CaO+CO 2 ) to produce quicklime (CaO) (see Non-Patent Document 1). In the case of this method, thermal energy of 766 kcal / kg-CaO is required for thermal decomposition. Therefore, in the conventional method for producing quicklime, as shown in Table 1 below, heavy oil, coal, LNG, coke, etc. are used as fuels, and heat energy required for each furnace is supplied from the outside. Therefore, in the above-mentioned conventional method for producing quick lime, in order to produce quick lime, it is necessary to supply ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10C10B39/02
CPCC10B39/02C04B2/12C04B2/10C04B2/108
Inventor 嘉村谅冈本宏隆松村贤司楠本久夫岩田好司菅野贵大
Owner JFE STEEL CORP
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