Iron based desulfurizer

Iron based desulfurizer - Names and Identifiers

Name	Iron based desulfurizer
Synonyms	Iron based desulfurizer

Iron based desulfurizer - Introduction

desulfurization agent, generally refers to the removal of fuel, raw materials or other materials in the free sulfur or sulfur compounds; in the control and treatment of pollutants mainly refers to the removal of sulfur oxides (including SO2 and SO3) in the exhaust gas.
The most commonly used desulfurizer for removing sulfur dioxide in flue gas is cheap lime, limestone and alkaline solution prepared with calcareous agent. Chemical plants, smelters and other often use sodium carbonate, alkaline aluminum sulfate and other solutions as desulfurizer treatment containing sulfur dioxide tail gas, and desorption recycling.

desulfurization agent generally refers to the removal of fuel, raw materials or other materials in the free sulfur or sulfur compounds; in the control and treatment of pollutants mainly refers to the removal of sulfur oxides (including SO2 and SO3) in the exhaust gas. Various basic compounds can be used as desulfurizing agents.
This mixed solution desulfurization agent has surface activity, catalytic oxidation, can promote the direct reaction of SO2, accelerate the dissolution of CaCO3, promote the rapid oxidation of CaSO3 into CaSO4, strengthen the precipitation of caso4, reduce the liquid-gas ratio, reduce the calcium-sulfur ratio, reduce the evaporation of water. When the SO2 concentration at the flue gas inlet increases and is higher than the design value, the pH value in the reaction tank of the absorption tower decreases and a larger Ca/S ratio is needed, caCO3 can quickly dissolve, increase the concentration of calcium ions, keep the pH value of the slurry in the normal range, and have a certain buffer effect on the pH value. Extending the running time of the slurry in the working section and reducing the number of slurry mixing can significantly reduce the scale of the equipment, reduce the thinning of the scale layer, rinse with water after shutdown, and the scale layer is easy to fall off. It reduces the dispersion and activity of scaling in the desulfurization system, reduces the deposition of scaling, reduces the content of chloride ions in the slurry, and reduces the corrosion and scaling rate of various materials in the desulfurization equipment to varying degrees, among them, the reduction of carbon steel is the most, the corrosion and scaling rate can be reduced by 74% and 79% respectively, and the polyvinyl chloride can be reduced by 48% and 55%. The addition of desulfurizer can play the role of scale, corrosion and corrosion inhibition, and reduce the blockage, scaling, corrosion and wear of desulfurization nozzle, Reduce the scaling, corrosion and wear of slurry circulating pump and impeller, and reduce the maintenance and replacement of spare parts in desulfurization system. Broaden the scope of the choice of desulfurization materials, improve the reliability of the system. Under different working conditions, the slurry circulation pump and oxidation fan can be reduced and deactivated, the desulfurization efficiency can be improved, the operation cost can be reduced, and the sulfur content in coal can be changed, and the high sulfur coal can be applied. In the application of flue gas desulfurization, it has broad market advantages, and can produce considerable economic and social benefits.

Last Update：2024-04-10 22:29:15

Iron based desulfurizer - Types of desulfurizer

Iron oxide desulfurizer

Iron oxide desulfurizer is a solid desulfurizer, with or without oxygen can desulfurization. The principle is that the sulfur compounds in the exhaust gas are chemically adsorbed into the pores of the desulfurization agent, and the chemical composition is changed to purify the gas. When the desulfurizing agent is saturated, that is, it is no longer capable of desulfurization, it needs to be regenerated, for example, by steam stripping regeneration. However, after a long time of use, the activity of the iron oxide desulfurizer will continue to decline, such as the small hole is blocked by some impurities, then the desulfurizer will be inactivated, however, when the reaction system has a small amount of oxygen, it can improve the desulfurization activity and prolong the service life. The active ingredient can be recovered from the waste desulfurizer.

liquid desulfurizer

Due to proton transfer, the reaction of H2S with MDEA(N-methyldiethanolamine) is a transient chemical reaction controlled by gas membrane:
H2S R2NCH3=[R2NHCH3] [HS]-
Since MDEA is a tertiary amine, CO2 is only subjected to acid-base neutralization with amine after forming bicarbonate with water:
CO2 H2O R2NCH3 R2NHCH3 HCO3
Because CO2 and water require a slow intermediate process, this large difference in reaction rates forms the basis for selective absorption, I .e., MDEA has a higher selectivity for H2S absorption in the presence of CO2.
The acid tail gas is washed with water to remove CH3OH and HCN therein, and then enters the bottom of the absorption tower to contact with the lean amine liquid added from the top, and the desulfurized purified gas escapes from the top of the absorption tower. The rich amine solution leaving the absorption tower is heated by heat exchange with lean amine through a heat exchanger, and then regenerated in a regeneration Tower, and the regenerated acid gas containing H2S and CO2 removed is used as a feed to the Claus unit, the lean amine is pumped to the absorption column via cooling.

Last Update：2024-04-10 22:29:15

Iron based desulfurizer - Related products

Name	N-methyldiethanolamine
category	focus products/methyl alcohol amine series
abbreviation	MDEA
Appearance (25 ℃)	A colorless to yellowish transparent liquid at room temperature.
content (%)	(GC)≥98.0%
Total Amine value	450-480mgKOH/g
color (G)	(Hazen)≤120
moisture (%)	≤1.0%
dissolution range	miscible with water and alcohol, slightly soluble in ether.
application field	widely used in oil field gas and gas desulfurization purification emulsifier and acid gas absorbent, acid-base control agent, polyurethane foam catalyst. The carbon dioxide in the synthetic ammonia can be removed with the participation of an activator. In addition, MDEA can also be used as pesticides, emulsifiers, semi-finished products of fabric additives, intermediates of antitumor drug hydrochloric acid nitrogen mustard, catalyst of carbamate coating, it is also a drying accelerator for paint.
CAS NO.	105-59-9