DE3600088A1 - Process for the acute additive or selective generation for desulphurisation components and denitration components in flue gas purification plants after combustion of fuels or after melting substances - Google Patents

Abstract

Published without abstract.

Description

Acute additive or selective generation process for Desulfurization (REA) - and for denitrification components in Flue gas cleaning systems after burning fuels or after melting substances.

SCR denitrification with the selective ammonia is known from storage tanks into the amount of exhaust gas in front of the catalytic converters to atomize, in liquid or gaseous ammonia state. The storage of ammonia in such large quantities as they do for SCR catalyst technology is only necessary with the Compliance with extreme safety regulations is possible, which the Make storage expensive and problematic.

For REA desulfurization and dechlorination with Ammonium or with ammonia only applies to ammonia.

The invention is intended to eliminate these disadvantages by no ammonia and its compounds, as well as ammonium and its connections, in whatever form, are stored or must be stored.

The selective or additive is said to. B. in fossil fuel combustion plants after burning the fossil Fuel in sequence for flue gas development from one Coking or burning are produced for acute Flue gas decontamination during flue gas development in the system periphery.

Pollutants and flue gas arise from combustion, therefore it makes sense to add additives and selectives for the Removal of pollutants from smoke exhaust gases during their formation to generate these pollutants in sequence.  

If in the manufacture of additional assets with toluene, e.g. B. tar or sulfur compounds as Sulfur water, coke and benzene are generated, so these can Accompanying economic goods to the primary additive and selective Production may be desirable with an energy gain because coke also arises as a residual material and gas as well Coke oven gas.

If a fuel, e.g. B. a solid, fossil fuel, is stored in order to reduce its volume or incinerate it this solid fuel is suitable to become also for pyrolyzing or coking.

A significant portion of this coking process can especially an ammonia compound or an ammonium compound be.

Ammonium and ammonia with their compounds are highly effective, e.g. B. in desulfurization processes and with the residual product, e.g. B. also as an ammonium sulfate fertilizer.

This desulfurization can be in the direction of the flue gas before or after denitrification. But also before or / and after denitrification or using SCR technology, ammonium and ammonia compounds highly effective selective z. B. also in SCR catalyst technology.

The ammonium or ammonia is obtained from the coking process and about the flue gas cleaning components of the Incinerator, e.g. B. gas, oil, coal or waste incineration plant, led into the exhaust gas stream of the combustion, for elimination which is also sulfuric or chloride acids, but also nitrous gases.

It is possible, for. B. an exhaust gas purification circuit in Flue gas flow direction in the sequence

• 1) desulfurize dry e.g. B. with ammonium compound or wet with ammonia compound,
• 2) denitrify with ammonia compound at substoichiometric Add ammonia, e.g. B. from coking for desulfurization and denitrification, or superstoichiometric with an additional residual desulfurization component for desulfurization and ammonium or ammonia slip lock in the flue gas stream.

The acute self-production of the selective or additive from solid fuels e.g. B. for the flue gas cleaning processes can also be used in modular pyrolysis or coking components for redundancy of the incinerator and at the same time, there would be a modular construction for the coking component a possible performance adjustment for ammonia production or ammonium regulation / ammonia regulation for the Emission control system of the incinerator.

The exhaust gas flow, which is also free from pyrolysis or coking will, will or can also be in the exhaust gas cleaning system Incinerator are performed. With the energy gain out the coking plant would be the coking offgas stream Transfer heat content to the combustion exhaust gas flow and this Temper isobar.

The flue gas cleaning system described thus integrates also an additive or selective production component and a stock of selective or additive is no longer necessary because if melted or incinerated or burned pyrolysis or  Coking, as required, for the flue gas cleaning process. An additional environmental impact is prevented because of the exhaust gases from the pyrolysis or coking component into the flue gas cleaning system be carried out for the purpose of cleaning and Tempering.

The coking component for additive, selective production for the individual flue gas cleaning components consists of z. B. individual sub-components and connections to the exhaust gas cleaning system for supply and disposal.

• 1 heating zone + 800 ° C
  2 cracking zone + 750 ° C
  3 tar template + 110 ° C
  4 NH ₃ + gas water zone
  5 CO ₂ + H ₂ S zone
  6 benzene C ₆ H ₆ zone activated carbon filter product (adsorption filter product)
  7 possible atmospheric burner or fan burner for raising the reaction temperature depending on the amount of combustion or melt flue gas.
  8 possible recuperative or regenerative energy recovery heat exchangers
  9 Denox and REA
  for denox, denitrification adsorptive or catalytic for FGD, desulfurization, dechlorination, dedusting.

The coking component primarily becomes ammonium and / or Ammonia with its compounds obtained and manufactured. Tar, carbonic acid, sulfur water, Benzene, coke and coke oven gas.

The benzene is used as a fuel-fuel additive, but also as a dye, drug, explosive, styrene, Aniline, plastics, detergents, Gammexan, DDT, solvents Paint.

Claims (10)

Claim 1:
characterized in that an ammonium / ammonia compound additive and / or selective production system is integrated or connected for a melting system or combustion system for the flue gas cleaning system, for feeding in the ammonium or ammonia and their compounds or another additive and / or selective into the raw gas exhaust gas flow, to reduce pollutants from the exhaust gas flow. Claim 2:
according to claim 1, characterized in that the exhaust gas stream is tempered from the by-product of the additive / selective production Claim 3:
according to claim 1 and 2, characterized in that a coking solid product z. B. coke remains, which can still be burned. Claim 4:
according to claim 1, 2 and 3, characterized in that tar is a by-product Claim 5:
according to claim 1,2,3 and 4, characterized in that z. B. NH ₃ and gas water, with its impurities. Claim 6:
characterized according to claim 1,2,3,4 and 5 dadruch that z. B. CO ₂ and H ₂ S arises with its impurities Claim 7:
according to claim 1,2,3,4,5 and 6, characterized in that, for. B. Benzene with its impurities Claim 8:
according to claim 1, 2, 3, 4, 5, 6 and 7, characterized in that the gas obtained from the coking can be used to heat the exhaust gas stream to be cleaned. Claim 9:
according to claim 1, 2, 3, 4, 5, 6, 7 and 8 characterized in that the peripherally generated additive and can also be used as a selective for exhaust gas flow cleaning before or after an ash filter or without an ash filter, for. B. for desulfurization and / or subsequent denitrification and / or post-desulfurization in overstoichiometric denitrification mode of operation as a selective slip lock in a filtering separator with residual product discharge. Claim 10:
according to claims 1-9, characterized in that the additive, selective component is built up in self-sufficient individual modules or as a single system.