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

Abstract

Provided are a method and apparatus for producing quick lime using a coke dry quenching facility and a heat exchanger, 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 heat exchanger, air is heated with the heated circulating gas in the heat exchanger to produce a heated gas, the heated gas thus produced is fed to a lime calcination furnace, and lime stone is thermally decomposed with the heated gas in the lime calcination furnace to produce quick lime. A cooled circulating gas produced by cooling of the heated circulating gas due to the heating of air in the heat exchanger is fed to the coke dry quenching facility, and the cooled circulating gas 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, relates to a method and device for producing quicklime using exhaust gas and heat exchangers of 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 ...

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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.

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