Process for recycling sulfuric acid from iron pyrite by low-temperature afterheat

Abstract

The invention discloses a method, process and equipment for recycling low-temperature afterheat generated in a roasting process of producing sulfuric acid from an iron pyrite. In the invention, a three-room heat storage type heat exchanger is adopted, low-temperature afterheat in the roasting process of producing the sulfuric acid from the iron pyrite is subjected to the heat exchange of low-temperature raw material gas and furnace front air according to a designed operation process and is transferred to furnace inlet air, and then the furnace inlet air brings the afterheat into a roasting boiling furnace to achieve the purpose of recycling the low-temperature afterheat, which has significance to saving energy, reducing emission and developing low-carbon economy.

Description

Technical field [0001] The present invention involves a low -temperature waste heat recovery technology for sulfuric acid roasting process of sulfuric acid sulfuric acid. It is specifically a method that uses a three -bedroom heat exchanger to recycle roast low temperature.Essence Background technique [0002] During the preparation of sulfur ore as raw materials, 950 from the boiling furnace o The high temperature sulfur dioxide qi (referred to as the qi of the raw materials) around the C and right after recovering the residual heat after the remaining heat boiler generates the steam, the temperature drops to 350 o Around C, enter the subsequent whirlwind separator, electric dust collector and other dust removal purification equipment.Because raw materials contain a small amount of sulfur dioxide with a small amount (calculated at a volume of about 0.05%), sulfur dioxide is less than 300 o C's temperature environment will combine with the water in the flue gas to form a sulfuric...

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Problems solved by technology

However, the classic double-chamber regenerative heat exchanger transfers the residual heat of the raw material gas from electrostatic precipitator to the air in front of the furnace, which cannot be carried out in the production operation: the raw material gas coming out of the fluidized fluidized furnace is a negative pressure system, and the regenerative heat exchange When the phase change in the vessel is exchanged with the air in front of the furnace, the air pressure in front of the furnace will change suddenly, which will affect the boiling state of the fluidized fluidized furnace. At the same time, the raw material gas will generate positive pressure, resulting in SO 2 Raw gas flows back out of the system, deteriorating the operating environment

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