EP2638322A2 - Combustion de biomasse accrue par l'oxygène - Google Patents

Combustion de biomasse accrue par l'oxygène

Info

Publication number
EP2638322A2
EP2638322A2 EP11782336.9A EP11782336A EP2638322A2 EP 2638322 A2 EP2638322 A2 EP 2638322A2 EP 11782336 A EP11782336 A EP 11782336A EP 2638322 A2 EP2638322 A2 EP 2638322A2
Authority
EP
European Patent Office
Prior art keywords
fuel
combustion
oxygen
combustion chamber
vol
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11782336.9A
Other languages
German (de)
English (en)
Inventor
Hisashi Kobayashi
Lawrence E. Bool Iii
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Praxair Technology Inc
Original Assignee
Praxair Technology Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Praxair Technology Inc filed Critical Praxair Technology Inc
Publication of EP2638322A2 publication Critical patent/EP2638322A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
    • F23L7/007—Supplying oxygen or oxygen-enriched air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44—Details; Accessories
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44—Details; Accessories
    • F23G5/442—Waste feed arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/10—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of field or garden waste or biomasses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2206/00—Waste heat recuperation
    • F23G2206/20—Waste heat recuperation using the heat in association with another installation
    • F23G2206/203—Waste heat recuperation using the heat in association with another installation with a power/heat generating installation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2207/00—Control
    • F23G2207/30—Oxidant supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2209/00—Specific waste
    • F23G2209/26—Biowaste
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2900/00—Special features of, or arrangements for incinerators
    • F23G2900/70—Incinerating particular products or waste
    • F23G2900/7003—Incinerating litter from animals, e.g. poultry litter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2900/00—Special features of, or arrangements for incinerators
    • F23G2900/70—Incinerating particular products or waste
    • F23G2900/7012—Incinerating rice or grain husks, hulls or bran
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L2900/00—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber
    • F23L2900/07007—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber using specific ranges of oxygen percentage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/12—Heat utilisation in combustion or incineration of waste
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/10—Biofuels, e.g. bio-diesel

Definitions

  • the present invention relates to combustion of biomass, especially power plants that generate steam.
  • the moisture content of biomass is typically very high.
  • green wood typically contains 40 to 60 % moisture.
  • This increased moisture content, and its low energy density, are among the primary issues with firing biomass in boilers and especially boilers that were designed for other fuels such as coal. For example, converting a coal-fired boiler to fire biomass typically cause the boiler to be derated by 30-50%.
  • boilers are 'flue gas limited' and can only handle up to a specific amount of flue gas.
  • This flue gas limitation may be due to the capacity of fans if present for impelling flow of flue gas, or may be based on design limits.
  • boiler design considerations such as the maximum allowable velocity in the convective section, can limit flue gas volume. Since the flue gas volume per unit heat input, or "specific flue gas volume", increases dramatically when a fuel such as coal is replaced with biomass, it causes a large impact on the distribution of heat absorption in the furnace.
  • a boiler is typically designed for a relatively narrow range of specific flue gas volume. Within this range the boiler is designed for a specific amount of heat absorption in the furnace, or radiant section, and the convective section.
  • a typical coal-fired boiler will operate with 3% "excess oxygen”. This means the flue gas contains 3% oxygen (by volume, wet basis).
  • the flue gas from a biomass-fired boiler typically contains at least 4.5% 0 2 (vol, wet basis) to control CO emissions within regulatory limits.
  • the extra air further increases the flue gas volume and impacts both the thermal efficiency of the boiler, and the auxiliary power required for the boiler.
  • the extra air volume carries heat out the stack, increasing the sensible heat loss.
  • the extra air also increases the power required by both the blower that pushes combustion air into the boiler (typically called the forced draft, or FD, fan), and the blower used to draw the flue gas from the boiler (typically called the induced draft, or ID, fan). Therefore the overall effect of the excess air is to increase the specific flue gas volume, which is the gas volume per units of energy output (further limiting the amount of fuel that can be fired), reduce the thermal efficiency (allowing less of the fuel that is fired to be used to raise steam), and increase the auxiliary power (reducing the net power available
  • the present invention provides an improved method for combustion of biomass in boilers. Brief Summary of the Invention
  • One aspect of the present invention is a method of combustion, comprising
  • Another aspect of the invention is a method of increasing fuel combustion rate in a combustion chamber with a convective heat transfer zone in which fuel that contains biomass is combusted with combustion air in said combustion chamber to produce flue gas containing a specific oxygen concentration between 3 vol. % and 8 vol.% at a given maximum fuel feed rate limited by the capacity of an FD fan if present for feeding said combustion air, the capacity of an ID fan if present to evacuate flue gas from said combustion chamber, the flue gas velocity in said convective heat transfer zone, or the carbon monoxide concentration in said flue gas, feeding into said combustion chamber additional fuel containing biomass and additional oxidant containing at least 50 vol.
  • Yet another aspect of the invention is a method of increasing fuel combustion rate in a combustion chamber with a grate for combustion of fuel with a convective heat transfer zone in which fuel that contains biomass is combusted with combustion air in said combustion chamber to produce flue gas containing a specific oxygen concentration between 3 vol.
  • Figure 1 is a cross-sectional view of one embodiment of combustion apparatus in which the present invention can be practiced. Detailed Description of the Invention
  • Biomass for the purposes of the present invention, means any material not derived from fossil resources and comprising at least carbon, hydrogen, and oxygen. Biomass includes, for example, plant and plant-derived material, vegetation, agricultural waste, forestry waste, wood, wood waste, paper waste, animal-derived waste, poultry-derived waste, and municipal solid waste. Other exemplary feedstocks include cellulose,
  • biomass can include one or more materials selected from: timber harvesting residues, softwood chips, hardwood chips, tree branches, tree stumps, leaves, bark, sawdust, off-spec paper pulp, corn, corn stover, wheat straw, rice straw, sugarcane bagasse, switchgrass, miscanthus, animal manure, municipal garbage, municipal sewage, commercial waste, grape pumice, almond shells, pecan shells, coconut shells, coffee grounds, grass pellets, hay pellets, wood pellets, cardboard, paper, plastic, and cloth.
  • the present invention can also be used for fuels that also comprise carbon-containing feedstocks other than biomass, such as a fossil fuel (e.g., coal or petroleum coke), i.e. mixtures of biomass and fossil fuels.
  • a fossil fuel e.g., coal or petroleum coke
  • the present invention is especially applicable to combustion of biomass in a combustion chamber that is part of a system that includes, in addition to a combustion chamber, heat exchangers that absorb heat of combustion into, for instance, water.
  • Preferred systems include power generation boilers, especially in which heat exchange to boiler feed water is achieved by radiant heat transfer and by convective heat transfer. The heat exchange produces steam, superheated steam, and/or supercritical steam, which can be used to generate electric power.
  • the present invention is especially applicable to combustion of biomass in a combustion chamber including a grate on which fuel rests as it is being combusted.
  • the present invention can be practiced in systems wherein the fuel is combusted in the combustion chamber by grate firing, suspension firing, or a combination of grate firing and suspension firing, or by firing in a bubbling fluidized bed or in a circulating fluidized bed.
  • Combustion chamber 1 includes grate 2 on which fuel can rest after the fuel is fed into combustion chamber 1, for instance as fuel stream 3.
  • Grate 2 is solid and includes a plurality of openings through which gas can flow, including primary air which is fed as primary air stream 4.
  • overfire air stream 5 can also be fed into the combustion chamber 1.
  • the heat of combustion can be transferred to feed water flowing through boiler tubes in the walls of combustion chamber 1 , to heat the feed water.
  • Heat of combustion can also be transferred from flue gas by indirect heat exchange to feed water, or to steam, in heat section 6 which generally includes a region (the "radiant section") in which heat transfer occurs predominantly by radiative heat transfer, and a region (the “convective section”) in which heat transfer occurs predominantly by convective heat transfer.
  • oxygen is fed in small amounts into the region below grate 2, into the region of the fuel on grate 2, or into both regions.
  • Sufficient oxygen is fed so that the gaseous atmosphere in contact with the fuel has an oxygen content higher than that of air, i.e. at least 21 vol.%, up to 5 vol.% higher than that of air and preferably not more than 1 vol.% higher than that of air.
  • the oxygen can be fed into the region below grate 2 in any of numerous ways, such as by mixing it with primary air that is fed as stream 4, or inserting a lance 8 into the region below grate 2 and feeding the oxygen through the lance into the region below grate 2 where it then can mix with primary air.
  • the oxygen can be fed into the region above grate 2 in any of numerous ways, such as by inserting a lance 9 into the region above grate 2 so that oxygen emerging from the lance 9 can contact fuel present on the grate, and feeding oxygen through the lance 9.
  • the oxygen that is fed below or above the grate 2 is preferably fed as a stream comprising at least 50 vol.% oxygen preferably 90 vol.% oxygen .
  • streams having such oxygen content are readily available from commercial sources.
  • streams having such oxygen content can be formed in apparatus located near the combustion chamber such as VPSA units that separate oxygen from air.
  • the practice of the present invention provides numerous advantages in its own right, and especially compared to prior practice relating to combustion of biomass.
  • the moisture content of fuel comprising biomass is typically very high. This increased moisture content, and its low energy density, are among the primary issues with firing biomass in boilers and especially boilers that were designed for other fuels. For example, converting a 50MW ne t coal-fired boiler (heat rate of 11,500 Btu/kWh net ) to fire biomass would be expected to cause the boiler to be derated by 20-45% just to account for the moisture in the fuel. The shift in boiler heat transfer balance and the increased excess air requirement increase the required derate to 30-50% for many boilers.
  • the present invention permits efficient combustion of biomass fuels, even in boilers that were designed for combustion of fuels having lower water contents, and/or higher energy density, than biomass.
  • the invention is useful when the fuel containing the biomass has a water content of at least 25 wt.%, or when the fuel containing the biomass has an energy content less than 7500 BTU/lb or even less than 5000 BTU/lb.
  • the addition of only a small amount of oxygen enhances and controls combustion both on and above the grate as a means to recover lost generating capacity.
  • the enhanced combustion in turn, enhances flame stability and ensures more complete burnout.
  • Oxygen injection over the grate can also stabilize and improve the combustion process.
  • the lower specific flue gas volume allows the boiler operator to increase the firing rate to regain some of the generating capacity lost when the boiler was converted to biomass firing. Even small reductions in excess air can allow boiler capacity lost during the conversion to biomass to be recovered (reducing the required boiler derate).
  • Another operational benefit of oxygen injection according to the present invention is that less heat will be 'pushed' into the convective section due to both the reduced specific flue gas volume and the increased temperature near the fuel bed on the grate. Both of these effects lead to increased heat absorption in the radiative part of the boiler - reducing the need to spray in cooling water to control superheat and reheat temperatures in the convective section.
  • oxygen could be added by combination of being directly injected or mixed with combustion air (enrichment).
  • combustion air enrichment
  • the over-bed oxygen lances can also be used to move heat (by influencing mixing) into different parts of the grate. For example, some of the heat from the volatile combustion zone of the grate can be moved into the drying portion of the grate to facilitate drying.
  • Overfire air 5 air supplied through ports located at one or more elevation from the grate) can also be enriched to enhance volatile combustion.
  • oxygen enrichment under the grate may be increased through the use of a lance to target areas where the grate is known to be 'cold', or combustion is poor.
  • the amount of oxygen required to recover capacity by enabling reduced excess oxygen operation is much less than that estimated for a simple direct replacement of combustion air.
  • the stoichiometric oxygen requirement for a typical dry ash-free wood is about 2,000 SCF (123 lb) per 1,000,000 Btu and produces about 3,200 SCF of flue gas.
  • 1 lb of oxygen can combust about 8130 Btu of fuel and produces 26 SCF of flue gas.
  • a portion of the original combustion air volume must be reduced and replaced with additional oxygen.
  • the oxygen requirement to increase the capacity (or fuel firing rate) by 10 % under the condition of constant flue gas volume flow rate was calculated for both dry and wet wood with 45% moisture content at two different excess oxygen levels ( 3 and 4.5 % by volume in wet flue gas) and summarized in Table 1.
  • the amount of oxygen required ranges from 2850 to 3410 SCF per MMBtu of additional fuel input at the constant excess 0 2 in flue gas. By reducing the excess oxygen level by 1 vol. %, the amount of oxygen required is reduced to less than half, in a range from 1140 to 1510 SCF per MMBtu of additional fuel input.
  • the current invention has several additional advantages.
  • many furnaces are designed for a specific heat absorption pattern.
  • the balance between heat transfer in the radiant (furnace) section is often carefully balanced with that in the convective section by the boiler designer. Variations in heat transfer pattern from the design point can cause significant upsets in boiler operation.
  • high oxygen enrichment levels such as those presented in the prior art (>25%) are used, the heat transfer to the radiant section is often dramatically increased.
  • the present invention also does not require exhaust gas recirculation for over-grate mixing. This leads to a much lower capital requirement (EGR fans, ducts, and the like) and reduced operating cost.
  • the oxygen addition of the present invention only to support combustion and thereby reduce the specific flue gas volume through excess air reduction, the volume reduction compared to oxygen use is much higher than in the prior art. This enhanced effectiveness of oxygen addition for flue gas reduction leads to much lower oxygen requirements.
  • a significant advantage of the current invention over the prior art is related to the use of oxygen enrichment only to support combustion and thereby reduce the specific flue gas volume through excess air reduction, the flue gas volume reduction compared to the simple replacement of a portion of combustion air with oxygen is much higher than in the prior art.
  • This enhanced effectiveness of oxygen addition for flue gas reduction leads to much lower oxygen requirements.
  • An example for converting a 20 MW ne t coal-fired boiler to fire biomass is shown in Table 2. For these calculations the flue gas volume was held constant, consistent with a flue gas limited boiler. The baseline generating capacity was defined as that after the boiler was converted to biomass firing (using a 32% moisture fuel) and was 14.7 MWnet in this example. The increased generating capacity was first estimated assuming the oxygen concentration in the flue gas was held constant at 4.5% (vol, wet) and combustion air was replaced with increasing levels of oxygen. This condition is the conventional 'volume
  • Volume reduction means operating such that the reduction in specific flue gas volume is attained only by the replacement of air with an equal amount of oxygen.
  • Present invention means operating such that the reduction in specific flue gas volume is attained in part by reduction in the amount of excess air.
  • the optimal embodiment of the current invention uses small amounts of oxygen to support the various stages of biomass combustion. These stages include:
  • these steps can occur in-flight or on the grate, depending on the fuel characteristics (size) and fuel spreader/boiler design. For example, fine particulate are likely suspended as they are 'thrown' into the furnace. Therefore for the fine materials the entire combustion process occurs in flight. For the largest particles they may dry slightly as they exit the fuel spreader but land on the grate before drying is complete. Therefore, for these particles the combustion process occurs primarily on the grate. Combustion problems can occur when the fuel and air distribution are not matched across the grate and overfire air. For example, if too much fuel is deposited on a specific portion of the grate the combustion air may be insufficient to burn the material.
  • the objective of the current invention is to use the least amount of oxygen to enable the excess air to be reduced (and thereby enable an increase in boiler firing rate). Therefore the optimal embodiment is to use a lance, or lances, above the grate to inject oxygen into oxygen-deficient areas above the grate. Often the oxygen deficient area looks darker than the rest of the grate as the local temperature is colder. Such area can be detected by in- furnace video camera, by an optical pyrometer or by visual observation. Other methods of detecting the oxygen deficient area include gas analysis using a gas sampling probe and by an optical gas species measurement device. With careful lance design mixing can be controlled between the injected oxygen and the oxygen deficient (and likely high CO) flue gas. Further, by targeting the injected oxygen jet horrctory high oxygen containing flue gas 'pockets' in the furnace
  • atomosphere can be drawn into the oxygen deficient area.
  • the combination of aerodynamic effects from the lance design and the kinetic effect of high oxygen concentrations enhance volatiles and CO combustion.
  • the over-grate lances can also be used to 'move' volatile combustion to add heat to cooler portions of the grate to support the combustion process on the grate.
  • the optimal embodiment can also use directed oxygen enrichment under the grate to enhance combustion on specific regions of the grate.
  • the windbox under the grate has partitions to divide the airflow to different parts of the grate
  • different levels of oxygen enrichment could be used in the different partitioned areas (through use of oxygen distributors in the air supply duct for each partition).
  • a carefully designed oxygen injection lance could be installed either below the grate or immediately above the grate to enrich the combustion air in the immediate vicinity of a known 'cold spot', or oxygen deficient areas.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Sustainable Energy (AREA)
  • Sustainable Development (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Solid-Fuel Combustion (AREA)
  • Combustion Of Fluid Fuel (AREA)

Abstract

Selon l'invention, le rendement énergétique d'une chambre de combustion de centrale électrique qui permet la combustion de biomasse comprenant du combustible, formant la totalité ou une partie du combustible, peut être accru en alimentant de l'oxygène à l'intérieur de la chambre de combustion de telle sorte que ledit combustible est en contact avec un gaz oxydant dont la teneur en oxygène dépasse celle de l'air jusqu'à 5 % en volume au-dessus de celle de l'air.
EP11782336.9A 2010-11-10 2011-10-31 Combustion de biomasse accrue par l'oxygène Withdrawn EP2638322A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US41211910P 2010-11-10 2010-11-10
PCT/US2011/058602 WO2012064545A2 (fr) 2010-11-10 2011-10-31 Combustion de biomasse accrue par l'oxygène

Publications (1)

Publication Number Publication Date
EP2638322A2 true EP2638322A2 (fr) 2013-09-18

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EP11782336.9A Withdrawn EP2638322A2 (fr) 2010-11-10 2011-10-31 Combustion de biomasse accrue par l'oxygène

Country Status (5)

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US (3) US20120111246A1 (fr)
EP (1) EP2638322A2 (fr)
BR (1) BR112013011435A2 (fr)
CA (2) CA2988939A1 (fr)
WO (1) WO2012064545A2 (fr)

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US9518734B2 (en) 2013-01-28 2016-12-13 General Electric Technology Gmbh Fluid distribution and mixing grid for mixing gases
ITUB20160520A1 (it) * 2016-01-29 2017-07-29 Rivoira Gas S R L Metodo migliorato per la combustione di biomasse in un boiler con alimentazione a lancio (spread-striker) e relativo boiler
CN110382961A (zh) 2017-03-03 2019-10-25 道格拉斯科技有限公司 用于连续干燥散装物品、特别是木屑和/或木纤维的包括热气旋风分离器的设备和方法
HUE070645T2 (hu) 2017-03-03 2025-06-28 Kronoplus Ltd Berendezés és módszer ömlesztett áru, különösen faforgács és/vagy farost folyamatos szárítására, hõcserélõvel
WO2018157948A1 (fr) * 2017-03-03 2018-09-07 Douglas Technical Limited Appareil et procédé de séchage continu de produits en vrac, en particulier de copeaux de bois et/ou de fibres de bois comprenant un générateur de gaz chaud à particules solides
UA125909C2 (uk) 2017-06-06 2022-07-06 Даґлас Текнікал Лімітед Установка і спосіб безперервного сушіння насипних матеріалів
CN108442986A (zh) * 2018-04-26 2018-08-24 东方电气集团东方锅炉股份有限公司 一种燃气与燃煤发电机组双耦合发电方法及系统
CN116293716A (zh) * 2023-04-04 2023-06-23 重庆乐乐环保科技有限公司 高含水率污泥连续自维持阴燃处理方法

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WO2010022741A2 (fr) * 2008-08-30 2010-03-04 Dall Energy Holding Aps Procédé et système de production d’un gaz chaud propre à base de carburants solides

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US20140338577A1 (en) 2014-11-20
BR112013011435A2 (pt) 2016-08-09
US20120111246A1 (en) 2012-05-10
WO2012064545A3 (fr) 2013-11-28
CA2988939A1 (fr) 2012-05-18

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