Method for igniting boiling furnace in production of acid with roasting process

Abstract

The invention discloses a method for igniting a boiling furnace in production of acid with a roasting process. According to the invention, discharged furnace slag or cleared furnace slag with a sulfurcontent of 46% or more in the boiling furnace of a pyrite concentrate acid-production system is adopted as a raw material of a bedding layer of the boiling furnace; a heat-radiation assisted heat conduction manner is adopted for heating of the bedding layer; different degrees of boiling operation is intermittently performed according to the increase curve of a temperature; thus, stability and reliability of ignition control of the boiling furnace are greatly improved; the ignition success rate of the boiling furnace is improved; the time of normal production is greatly advanced; meanwhile, safety of an operator and production equipment is guaranteed; and the production operation cost of an enterprise can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a method for igniting a boiling furnace for acid production by roasting. Background technique [0002] Roasting acid production enterprises are equipped with fluidized furnaces. When the production equipment is just completed and put into operation or after the equipment is shut down for maintenance for a long time, the fluidized furnace needs to be heated and ignited. At present, the commonly used fluidized furnace ignition techniques are: First, lay about 600mm of Clean the river sand, and then heat it with a natural gas (or liquefied gas or diesel fuel) musket at the lower part of the furnace to gradually increase the temperature of the furnace and the river sand on the bedding layer, and turn on the air blower for the bedding while heating. The river sand layer is boiled, so that the temperature of the river sand is evenly raised in the form of heat conduction and...

AI Technical Summary

Problems solved by technology

The first ignition technology, due to the uneven particle size of the river sand, contains a certain amount of water, and the temperature distribution cannot be guaranteed even when boiling, and the air blower controls the air volume too small during the blast boiling process, resulting in poor boiling effect. If the control is large, more heat will be taken away, and the finer particles will be taken outdoors with the airflow, resulting in greater cost waste and environmental pollution, and greatly prolonging the time for heating and ignition, affecting corporate benefits

The second ignition technology, because the pyrite or sulfur part of the bedding layer starts to burn slowly in the later stage of heating, the sulfur dioxide, part of the sulfur trioxide and finer pyrite will be taken outdoors with the flue gas, causing environmental pollution and The equipment is corroded, and the safety and environmental protection pressure is relatively high; or the flue gas directly enters the system pipeline, and there is no environmental pollution, but because the flue gas cannot be dedusted or demisted (there may be flammable gases in the flue gas, in the electrostatic precipitator, electric There is a risk of explosion in a high-voltage electric field such as a mist eliminator), which will cause dust and mist to be brought to the subsequent conversion section, which will have a greater impact on the conversion catalyst, affect the life of the catalyst, and even affect the conversion rate in severe cases.

[0004] Therefore, the current two ignition technologies have disadvantages such as long heating and ignition time, large energy consumption, serious environmental pollution, and difficulty in ignition control, and the success rate of ignition is not very high. More often, it is necessary to use a heat gun while feeding Continue to heat, which will have a serious negative impact on both the purification section and the finished product conversion section, and will also have a greater impact on the company's safety, high efficiency, energy saving, and environmental protection production