Device and method for manufacturing dry ice by utilizing radiant heat to produce active lime

Abstract

The invention provides a device and a method for manufacturing dry ice by utilizing radiant heat to produce dry ice. The device and the method are applied to lime stones with small particle size of 20-40 mm in mine production. Roasting is carried out through heat transferred through radiation by a combustion chamber in a roasting chamber, the roasted lime stones are decomposed into calcium oxide and carbon dioxide, the calcium oxide is cooled, discharged out through an ash discharging device and fed into an ash bin for storage, the carbon dioxide passes through a drying device, a pressure device, a carbon dioxide liquefying plant and a dry ice device through connected waste gas pipelines to generate dry ice, after coal gas or powdered coal in the combustion chamber is combusted, the coal gas or powdered coal is discharged out through a fan for waste heat recovery and are discharged through a chimney. Active lime with higher quality can be obtained, pure carbon dioxide can be effectively recycled and is processed and manufactured into food grade dry ice, and meanwhile waste heat can be recycled for secondary use, so that a new way with larger market prospect is developed for the production of active lime and comprehensive application of resources in our country.

Description

technical field [0001] The invention relates to the technical fields of metallurgy and chemical industry, in particular to a device and a method for producing high-performance active lime in the metallurgical industry and utilizing waste gas to produce dry ice. Background technique [0002] The 2009 Copenhagen Climate Change Symposium brought the low-carbon economy into the global focus. The low-carbon economy is an economic development model based on low energy consumption, low pollution, and low emissions. It is a fundamental change to the current production mode that consumes a lot of fossil energy and emits a lot of carbon dioxide. In 2005, it decreased by 40-45%, and was included in the medium and long-term planning of national economic and social development as a binding indicator. [0003] As an important resource, carbon dioxide is widely used. At the same time, the emission of carbon dioxide is also one of the main causes of global warming. Therefore, effective rec...

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Problems solved by technology

This method is relatively high in terms of raw material cost and production operation cost.

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