MECS SULFOX PROCESS FOR GAS · PDF filemecs® sulfox™ process for gas desulphurisation and sulphurous waste regeneration sulfox™ applications • refinery sru • coal...

MECS® SULFOX™ PROCESSFOR GAS DESULPHURISATION AND SULPHUROUS WASTE REGENERATION

SULFOX™ APPLICATIONS• Refinery SRU• Coal gasification SRU• Natural gas processing SRU• Spent acid and liquid sulphates regeneration• Coke manufacturing• Viscose fibres• Mining and roasting• Pigments production

SULFOX™ NK

BENEFITS• Low SO2 and acid mist emissions• Very reliable and proven gas cleaning using DynaWave® technology• Simple automated operation (minimal operators required)• Robust and low maintenance acid condensation column with short horizontal glass tubes• Special catalyst usage for specific applications• Long catalyst operation without screening• Very compact modular design

FEATURES• Wet catalytic oxidation of sulphur compounds with recovery of concentrated sulphuric acid• Solution for a wide range of off gas compositions• Efficient waste heat recovery• High steam production for concentrated H2S feeds• Economical alternative with low operating costs compared to Claus (H2S) or scrubbing (SO2)• No or minimal liquid effluent• Very low cooling water consumption• Flexible and reliable operation with high turndown ratio

PRODUCE SULPHURIC ACID INSTEAD OF SULPHUR OR GYPSUM EFFLUENTThe SULFOX™ process is a highly energy efficient technology that produces saleable sulphuric acid as the product from cleaning waste gases containing sulphur compounds.

MECS® SULFOX™ PROCESSFOR GAS DESULPHURISATION AND SULPHUROUS WASTE REGENERATION

The SULFOX™ process is based on the thermal and catalytic conversion of sulphur-bearing compounds into sulphuric acid. Depending on the feed gas conditions, customised plant types are offered. For low concentrations, the feed gas is preheated to the required catalyst inlet temperature by the glass tube heat exchanger of the condensation column and an additional gas preheater from the heat recovery system. An additional direct fired preheater is used for start-up and very low plant rate operation.

For high concentration H2S, the gas feed is burned in a combustion chamber and cooled by steam equipment to the required catalyst inlet temperature. The converter contains catalyst beds where the sulphur compounds are oxidised to SO2 and SO3. The SO3 reacts with the water vapour to form gaseous sulphuric acid. A heat recovery system transfers the excess heat to either the incoming feed gas stream or high pressure steam produced in the steam equipment.

CORE SULFOX™ FLOW DIAGRAM

SO2→ SO3

SO2 → SO3

SO2 → SO 3

Feed GasSO2+ O2+ H2 O

Converter w/ Internal Heat Exchangers

Condensation Column w/ Glass Heat Exchanger

WESP

Tail Gas

Ambient Air

Heat Recovery (Steam, BFW, Molten Salt)

Sulphuric Acid

Hot Air

USED FOR HIGH H2S GAS FEED CONCENTRATION

USED FOR SPENT ACID AND LIQUID SULPHATE REGENERATION

USED FOR DIRTY OFF GAS FEEDS IN THE METALLURGICAL INDUSTRY

USED FOR LOW FEED GAS CONCENTRATION

FEEDGAS

CLEAN TAIL GAS

SULPHURIC ACID

FEEDGAS

FEEDGAS

FEEDGAS

SULFOXTM

CLEAN TAIL GAS

SULPHURIC ACIDSULFOXTM

CLEAN TAIL GAS

SULPHURIC ACIDSULFOXTM

CLEAN TAIL GAS

SULPHURIC ACIDSULFOXTM

COMBUSTIONCHAMBER/

STEAMEQUIPMENT

GAS CLEANINGSYSTEM

DECOMPOSITION/STEAM

EQUIPMENT

GAS CLEANINGSYSTEM

SULFOX™ NK

SULFOX™ HK

SULFOX™ MET

SULFOX™ SAR

The acid condenses in the condensation column and evaporation of water produces concentrated acid that is collected in the sump of the column. The wet electrostatic mist precipitator (WESP) removes the remaining acid mist. A further reduction of SO2 emissions can be achieved either with a DynaWave® tail gas scrubber or an activated carbon filter.

For dirty and wet SO2 gases, a customised gas cleaning system is included. Spent acid or liquid sulphate feeds are regenerated by combining SULFOX™ technology with a decomposition furnace followed by steam equipment and a gas cleaning system. The following block diagrams present the different plant configurations for the range of feed types processed:

MECS® SULFOX™ PROCESSFOR GAS DESULPHURISATION AND SULPHUROUS WASTE REGENERATION

SULFOX™ HK

A UNIQUE, RELIABLE SOLUTIONThe SULFOX™ process is a unique wet gas sulphuric acid process where merchant grade sulphuric acid is produced instead of unwanted process by-products, sulphur or gypsum effluent. Each SULFOX™ plant is custom designed according to the feed gas concentrations and the customer’s specific requirements while keeping the investment and operating costs as low as possible. The SULFOX™ process, which was developed to treat sulphur-containing waste gases, has over 20 years of successful field experience.

MECS is one of few companies that design and manufacture their own sulphuric acid process equipment and technologies such as catalyst, heat recovery and mist elimination. By combining process technology, materials science, the backing of DuPont and nearly a century of sulphuric acid plant expertise, MECS can provide a single point overall guarantee of quality workmanship and performance.

Copyright© 2014 MECS, Inc. All rights reserved. The DuPont Oval Logo, DuPont™, The Miracles of Science™ and all products denoted with a ® or ™ are trademarks or registered trademarks of E. I. du Pont de Nemours and Company or its affiliates.

www.cleantechnologies.dupont.comwww.mecs.dupont.com

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MECS Inc. HeadquartersChesterfield, Missouri 63017 USATel: +1-314-275 [email protected]

MECS also has offices in Asia Pacific and the Americas. SULPHURICPROCESS TECHNOLOGIES