An energy-saving and environment-friendly ignition method for pyrite acid-making fluidized furnace

Abstract

The invention discloses an energy-saving eco-friendly ignition method of a pyrite-based acid making fluidized bed furnace. The method utilizes an acid making raw material sulphur as ignition fuel and pyrite-based acid making red slag and diesel oil as auxiliary ignition materials and comprises igniting two oil guns in a furnace, after all sulphur in the hearth burns and produces blue and yellow flames with height of about 10cm, observing a boiling state in the furnace and bottom temperature cases, timely adjusting air quantity and an ore use amount, after the fixed bed temperature is increased to about 650-700 DEG C, adding pyrite into the furnace and gradually stopping sulphur addition, wherein when the furnace bottom temperature is higher than 800 DEG C, fluidized bed furnace combustion is a normal state so that ignition is successful. The method has a time interval of less than 1h between fluidized bed furnace ignition and gas feeding and after about 3h, the furnace temperature is basically normal. The whole ignition process has short time consumption and less oil consumption and reduces waste gas discharge so that environment pressure is relieved and an operation environment is improved. The method has obvious energy saving effects and environmental and social benefits.

Description

technical field [0001] The invention relates to the technical field of fluidized-bed furnace combustion, in particular to an energy-saving and environment-friendly novel method for igniting a fluidized-bed furnace for sulfuric acid production. Background technique [0002] In the production process of sulfuric acid from pyrite ore, boiling furnace is usually used to prepare sulfur dioxide by roasting pyrite ore. In the prior art, diesel ignition technology is mainly adopted for restarting the fluidized fluidized furnace after new construction or overhaul. Diesel is used as fuel to raise the temperature. When the boiling layer temperature reaches about 700°C, pyrite is added to raise the furnace temperature and ventilate. However, this ignition technology has disadvantages such as long ignition time and high diesel consumption. In addition, a large amount of sulfur dioxide and oily black smoke will be evacuated during the ignition and heating process, polluting the surroundin...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies such as long ignition time, high diesel consumption, high-temperature scarring, and serious air pollution of existing pyrite acid-making fluidized furnaces, and provide an energy-saving and environmentally friendly new ignition method for pyrite acid-making fluidized furnaces.