Design of dedusting desulfurization and dichlorination
purification system
Abstract
Blast furnace gas is one of the main by-products in the process of ironmaking.
The CO, HCl, H2S, COS and other toxic gases in blast furnace gas as well as a
large amount of dust have caused non-negligible pollution to the atmosphere, so it
is urgent to control the blast furnace gas. However, there are still usable high
temperature and high-pressure gas in the gas as well as useful gas that can be
recycled for secondary use. Therefore, further utilization of the gas in the process
of dedusting, desulfurization and dichlorination will bring huge economic benefits
to the whole plant.
The main content of this design is to design the process of dedusting,
desulfurization and dichlorination for the blast furnace gas flow of 400,000 m /h
under standard conditions, so as to make it meet the discharge requirements. At
present, the main methods of removing organic sulfur from blast furnace gas
include hydrogenation and conversion, oxidation, adsorption and hydrolysis.
Catalytic hydrolysis is one of the most important methods to remove organic
sulfur. At present, there are many kinds of gas dust removal technology at home
and abroad. Therefore, the scheme of this design is the cyclone dust collector to
the blast furnace gas for coarse dust, and then through the bag filter for further
dust. After dust removal, the organic sulfur conversion process adopts efficient
hydrolysis conversion process, which is mainly to catalyze the hydrolysis of
organic sulfur into hydrogen sulfide, and then to purify hydrogen sulfide and
chloride by spray absorption.
This design is mainly aimed at the design of a purification system for
dedusting, desulfurization and dichlorination of a certain 1500m blast furnace gas.
For this design, the pretreatment tower and catalytic hydrolysis tower are set
before the TRT residual pressure power generation unit, and the spray absorption
tower is set before and after the TRT residual pressure power generation unit, so
as to realize the technical requirements of desulfurization and dichlorination of the
blast furnace gas. This design also estimates the construction cost required by the
whole process.
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