Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
  • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
  • C10J3/57—Gasification using molten salts or metals
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
  • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
  • C10J3/72—Other features
  • C10J3/78—High-pressure apparatus
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
  • C10J2300/00—Details of gasification processes
  • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
  • C10J2300/0903—Feed preparation
  • C10J2300/0909—Drying
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
  • C10J2300/00—Details of gasification processes
  • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
  • C10J2300/0913—Carbonaceous raw material
  • C10J2300/0946—Waste, e.g. MSW, tires, glass, tar sand, peat, paper, lignite, oil shale
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
  • C10J2300/00—Details of gasification processes
  • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
  • C10J2300/0953—Gasifying agents
  • C10J2300/0959—Oxygen

Definitions

• the invention relates to a method for cooling OBM nozzles in coal gasification plants, in which a carbon-containing fuel and / or oxygen encased by a cooling protective medium are introduced into a liquid iron bath.
• OBM nozzles which are arranged in OBM converters for steel production or in coal gasification plants, takes place by means of a jacket gas which is blown through the outer ring nozzle.
• OBM nozzles are known to consist of at least two concentric metal tubes, through the inner tubes carbon-containing fuel and / or oxygen is introduced into the liquid iron bath of the coal gasification plant.
• the OBM nozzles are cooled by coal gas which flows through the outer ring channels.
• this has the disadvantage that part of the gas generated must be used for cooling the nozzle and is therefore no longer available for delivery to external consumers. Since it is customary to 6% of the coal gas produced must üscnschutz used for the D, results in an efficiency of the coal gasification debilitating loss.
• the cooling of OBM nozzles must be carried out in such a way that the nozzle itself does not burn prematurely, and no deposits can form on the nozzle which can lead to a closure.
• the latter danger is present in the nozzle known from FR-PS 14 50 718. It is therefore desirable that the OBM nozzles are cooled in such a way that they do not burn too quickly or too slowly, so that the nozzle openings are not always at approximately the same level as the bottom or the side wall of the reaction vessel (converter).
• this object is achieved in that a sewage sludge is used as the protective medium.
• sewage sludge contains hydrocarbons and other chemical compounds. These were cracked when they entered the iron bath at a temperature of about 1500 ° C. The cracking process needs heat that from the environment, and thus in particular from the nozzle pipes. This cools them.
• a waste material namely sewage sludge
• the invention also enables the removal or processing of sewage sludge.
• the treatment of sewage sludge according to the previously known methods leads to special problems due to the heavy metal content of the sewage sludge. However, these can advantageously be circumvented by the invention, since the heavy metals dissolve in the iron bath and can thus be isolated.
• the combustible substances present in the sewage sludge are advantageously used in the process according to the invention, they either make a contribution to the heat balance of the coal gasification plant or appear in the form of CO or H 2 in the coal gas produced. According to the invention, it is therefore advantageous only to clean the sewage sludge used for cooling the nozzle, but not - as is otherwise customary in sewage treatment plants - to pasteurize and then allow it to rot. The latter two steps require energy to heat up the sewage sludge and also remove a portion of the flammable substances carried along from the sewage sludge. As is well known, the digestion process produces biogas that contains methane in particular, which means that the invention can also reduce the costs of wastewater treatment plants because the wastewater treatment stages can be saved.
• N is un operate a wastewater treatment plant for quite some time in Berlin, where the also only clean, but not pasteurized and not digested sewage sludge is burned in fluidized bed.
• this process does not eliminate the problem of the heavy metals contained in the sewage sludge, especially cadmium.
• the heavy metals can be found in the combustion residues and lead to environmental problems if they are sprinkled on arable soil as previously carried out.
• the sewage sludge is advantageously fed to the OBM nozzles in liquid form; it still contains enough water to be pumpable. In this consistency, the sewage sludge can simply be pressurized and fed to the OBM nozzles. In order to be able to use sewage sludge with lower water contents and to be able to control the supply of water to the coal gasification plant accordingly, it is proposed to add a gas to the sewage sludge in order to fluidize it.
• the composition of the sewage sludge strongly depends on its origin. There are many organic substances, faeces and paper residues in the sewage from residential areas.
• Industrial waste water carries with it typical waste materials for the special industrial companies, for example wood flour or dust in the wood processing industry u.
• the wastewater must first be freed of sand and coarse material, a sand trap in which sand u. Sedimented as well as at least one arithmetic unit that sieves the coarse materials.
• the sewage sludge cleaned in this way typically has a water content of 97% and can be used directly for the use according to the invention for nozzle cooling. However, it is advantageous to remove at least part of the water. A mechanical predrying is sufficient for this.
• Experience has shown that sewage sludge is still pumpable at water contents of around 75% and can be fed directly to the OBM nozzles.
• the control according to the invention of the total heat balance of the coal gasification plant by further addition of sewage sludge is very advantageous. This is introduced, for example, through inner tubes of the OBM nozzle, in particular together with the oxygen, in the amount necessary for the respective control of the iron bath temperature. In this way, additional sewage sludge is processed and removed.
• a main advantage of the method according to the invention is environmental protection.
• the environmentally harmful substances contained in the sewage sludge accumulate either in the bath, in the slag or in the dust particles carried in the gas.
• the likelihood that they will be carried in the coal gas is low, especially since the proportion of e.g. B. mercury in sewage sludge is exceptionally deep.
• the pollutants thus bound and thus isolated in the bath, in the slag or in the dust particles can be removed from the bath, the slag or the iron particles or separated from them. They are then available for further processing or can be significantly more environmentally friendly Licher than possible according to the previously known methods are stored in a landfill.
• the OBM nozzle is understood to mean any nozzle suitable for the under-bath nozzle technology.
• the method for nozzle cooling according to the invention can generally be used in methods in which a substance is to be introduced from below into a molten bath by means of nozzles and there is a need to cool the sub-bath nozzle used for this purpose.
• the method according to the invention is also suitable for nozzles in converters which serve to produce steel.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Organic Chemistry (AREA)
• Treatment Of Sludge (AREA)
• Carbon And Carbon Compounds (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=6165668

Family Applications (1)

Country Status (8)

Cited By (2)

Citations (5)

• 1982
  • 1982-06-09 DE DE19823221699 patent/DE3221699A1/de not_active Withdrawn
• 1983
  • 1983-04-28 EP EP83104166A patent/EP0096212A3/fr not_active Withdrawn
  • 1983-05-13 ES ES522371A patent/ES522371A0/es active Granted
  • 1983-06-06 JP JP58099620A patent/JPS594688A/ja active Pending
  • 1983-06-07 AU AU15434/83A patent/AU1543483A/en not_active Abandoned
  • 1983-06-08 BR BR8303045A patent/BR8303045A/pt unknown
  • 1983-06-08 ZA ZA834165A patent/ZA834165B/xx unknown
  • 1983-06-09 PL PL24244283A patent/PL242442A1/xx unknown

Patent Citations (5)

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