WO2016161821A1 - Circulating fluidized bed oxygen-enriched combustion apparatus and operation method therefor - Google Patents

Circulating fluidized bed oxygen-enriched combustion apparatus and operation method therefor Download PDF

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WO2016161821A1
WO2016161821A1 PCT/CN2015/099445 CN2015099445W WO2016161821A1 WO 2016161821 A1 WO2016161821 A1 WO 2016161821A1 CN 2015099445 W CN2015099445 W CN 2015099445W WO 2016161821 A1 WO2016161821 A1 WO 2016161821A1
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flue gas
air
fluidized bed
circulating fluidized
oxygen
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PCT/CN2015/099445
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French (fr)
Chinese (zh)
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毛宇
陈灿
胡修奎
霍锁善
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东方电气集团东方锅炉股份有限公司
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Publication of WO2016161821A1 publication Critical patent/WO2016161821A1/en

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00Fluidised bed combustion apparatus
    • F23C10/02Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
    • F23C10/04Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
    • F23C10/08Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases
    • F23C10/10Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases the separation apparatus being located outside the combustion chamber
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00Fluidised bed combustion apparatus
    • F23C10/18Details; Accessories
    • F23C10/20Inlets for fluidisation air, e.g. grids; Bottoms
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C9/00Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23LSUPPLYING 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
    • F23L7/00Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23LSUPPLYING 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
    • F23L7/00Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
    • F23L7/007Supplying oxygen or oxygen-enriched air
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

Provided are a circulating fluidized bed flue gas recirculation and oxygen-enriched combustion apparatus and an operation method therefor. The oxygen-enriched combustion apparatus comprises an air chamber (101), an air distribution device (102) arranged above the air chamber (101) and a hearth (103) arranged above the air distribution device (102), wherein the upper part of the hearth (103) is connected with a high-temperature cyclone separator (104), the upper part of the high-temperature cyclone separator (104) is connected with a heated surface (106), the lower part of the heated surface (106) is connected with a coal economizer (107), the lower part of the coal economizer (107) is connected with a medium-temperature cyclone separator (108), the medium-temperature cyclone separator (108) is connected with the air chamber (101) via a primary flue gas recirculation fan (109) and a primary air oxygen injector (111) successively, and the medium-temperature cyclone separator (108) is connected with the air distribution device (102) via a secondary flue gas recirculation fan (110) and a secondary air oxygen injector (112) successively. In the operation method for the oxygen-enriched combustion apparatus, a medium-temperature flue gas is adopted as a primary air and a secondary air, which are respectively brought as a recirculation air into the hearth (103), and oxygen is injected to the primary air and the secondary air respectively, which achieves an adjustment of oxygen injection amount, and at the same time provides an oxidizing agent for the hearth (103).

Description

循环流化床富氧燃烧装置及其运行方法Circulating fluidized bed oxyfuel combustion device and operation method thereof 技术领域Technical field

本发明涉及一种循环流化床烟气再循环富氧燃烧装置及其运行方法,属于锅炉制造及节能环保工程的技术领域。The invention relates to a circulating fluidized bed flue gas recirculation oxyfuel combustion device and an operation method thereof, and belongs to the technical field of boiler manufacturing and energy conservation and environmental protection engineering.

背景技术Background technique

二氧化碳因具有温室效应被普遍认为是导致全球气候变暖的重要原因之一,化石能源的利用是大气中最重要的CO2来源,如果将全球温室气体排放量按行业统计,发电行业是最大的排放源。而燃煤发电又是发电行业中CO2排放的最主要来源,全球发电行业燃煤发电占40%。全球有大量的化石燃料电厂在运行,这就需要找到一种针对化石燃料发电的CO2减排解决方案。因此,国际社会在《联合国气候变化框架公约》基础上对全球气候变化问题进行了广泛合作。缔约国于1997年签定的《京都议定书》设定了主要工业化国家减少温室气体排放的目标。降低CO2排放从此成了全球应对气候变化共同努力的目标。Carbon dioxide is widely recognized as one of the important causes of global warming due to its greenhouse effect. The use of fossil energy is the most important source of CO 2 in the atmosphere. If the global greenhouse gas emissions are based on industry statistics, the power generation industry is the largest. Emission source. Coal-fired power generation is the most important source of CO 2 emissions in the power generation industry. Coal-fired power generation in the global power generation industry accounts for 40%. There are a large number of fossil fuel power plants in operation around the world, which requires finding a CO 2 abatement solution for fossil fuel power generation. Therefore, the international community has conducted extensive cooperation on global climate change issues based on the United Nations Framework Convention on Climate Change. The Kyoto Protocol, signed by the State party in 1997, sets the target for reducing greenhouse gas emissions in major industrialized countries. Reducing CO 2 emissions has since become the goal of a global effort to address climate change.

富氧燃烧是在现有电站锅炉系统基础上,富氧燃烧系统是用纯氧或富氧代替空气作为化石燃料燃烧的氧化介质,燃烧产物主要是CO2和水蒸气,另外还有多余的氧气以保证燃烧完全,以及燃料中所有组成成分的氧化产物、燃料或泄漏进入系统的空气中的惰性成分等。经过冷却水蒸汽冷凝后,烟气中CO2含量在80%~98%之间。这样高浓度的CO2经过压缩、干燥和进一步的净化后进行利用或存储,从而以较小的代价冷凝压缩后实现CO2的永久封存或资源化利用,较为容易实现大规模化CO2富集和减排,并且由于这种新型燃烧方式与现有电站燃烧方式在技术具有良好的承接性,也容易被电力行业接受。Oxygen-enriched combustion is based on the existing power plant boiler system. The oxy-combustion system uses pure oxygen or oxygen-rich instead of air as the oxidizing medium for fossil fuel combustion. The combustion products are mainly CO 2 and water vapor, and there is excess oxygen. To ensure complete combustion, as well as oxidation products of all constituents in the fuel, fuel or inert components leaking into the air of the system. After condensation by the cooling water vapor, the CO 2 content in the flue gas is between 80% and 98%. Such high concentration of CO 2 is utilized or stored after being compressed, dried and further purified, thereby achieving permanent storage or resource utilization of CO 2 after condensation and compression at a small cost, and it is easy to realize large-scale CO 2 enrichment. And emission reduction, and because this new combustion mode and the existing power station combustion mode have good inheritance in technology, it is also easily accepted by the power industry.

现有的富氧燃烧装置存在CO2大量排放等问题,导致CO2捕集率低的问题,同时,大量烟气直接排放之后,造成资源的浪费。The existing oxy-combustion device has problems such as a large amount of CO 2 emission, which causes a problem of low CO 2 capture rate, and at the same time, a large amount of flue gas is directly discharged, resulting in waste of resources.

发明内容Summary of the invention

本发明的目的在于提供一种循环流化床烟气再循环富氧燃烧装置及其运行方法,能够改善现有技术存在的不足,采用中温烟气作为一次风和二次风,分别进入炉膛作为再循环风,并对一次风和二次风进行分别注氧,实现注氧量的调节,同时为炉膛燃烧提供氧化剂,能够使循环流化床锅炉排出的CO2浓度富集到80%以上,利于煤燃烧后烟气中CO2的捕集。The object of the present invention is to provide a circulating fluidized bed flue gas recirculation oxyfuel combustion device and an operation method thereof, which can improve the deficiencies of the prior art, and adopt medium temperature flue gas as primary air and secondary air, respectively, into the furnace as The air is recirculated, and the primary air and the secondary air are respectively injected with oxygen to realize the adjustment of the oxygen injection amount, and at the same time, the oxidant is provided for the furnace combustion, and the CO 2 concentration discharged from the circulating fluidized bed boiler can be enriched to 80% or more. Conducive to the capture of CO 2 in the flue gas after coal combustion.

本发明通过以下技术方案实现:The invention is achieved by the following technical solutions:

循环流化床富氧燃烧装置,包括风室、设置在风室上方的布风装置和设置在布风 装置上方的炉膛,在所述炉膛上部连接有高温旋风分离器,在所述高温旋风分离器上部连接有受热面,在所述受热面下部连接有省煤器,所述高温旋风分离器下端通过回料器与布风装置相连接,所述省煤器下部连接有中温旋风分离器,所述中温旋风分离器依次通过一次烟气再循环风机和一次风氧注入器与风室相连接,并且所述中温旋风分离器下部依次通过二次烟气再循环风机和二次风氧注入器与布风装置相连接,所述省煤器下部依次通过烟气预热器、除尘器与引风机相连接,所述引风机远离烟气预热器一端与CO2压缩纯化装置相连接,在所述布风装置上设置有播煤管。The circulating fluidized bed oxyfuel combustion device comprises a wind chamber, an air distribution device disposed above the air chamber, and a furnace disposed above the air distribution device, and a high temperature cyclone separator is connected to the upper portion of the furnace, and the high temperature cyclone is separated The upper part of the device is connected with a heating surface, and an economizer is connected to the lower part of the heating surface, and the lower end of the high-temperature cyclone is connected to the air distribution device through a returning device, and the middle part of the economizer is connected with a medium temperature cyclone separator. The medium temperature cyclone separator is sequentially connected to the air chamber through a primary flue gas recirculation fan and a primary air oxygen injector, and the lower portion of the medium temperature cyclone separator passes through the secondary flue gas recirculation fan and the secondary air oxygen injector in sequence. Connected to the air distribution device, the lower part of the economizer is connected to the air blower through a flue gas preheater and a dust remover, and the end of the draft fan is connected to the CO 2 compression and purification device at a side away from the flue gas preheater. The coal distribution device is provided on the air distribution device.

通过布风装置使床料均匀流化,防止大颗粒床料沉积,避免结渣和漏渣,经过中温旋风分离器和烟气再循环风机,通过烟气再循环风机抽取中温湿烟气进行烟气再循环,中温湿烟气含有大量的水蒸气,湿烟气进入炉膛,将大量的水蒸气带入炉内,相当于向炉内增湿,提高脱硫效率。通过中温旋风分离器输出的烟气经过一次烟气再循环风机并通过一次风氧注入器注入氧气之后输入到炉膛,作为一次风;通过中温旋风分离器输出的烟气经过二次烟气再循环风机增压,并由二次风氧注入器注入氧气后作为二次风输入到炉膛。由于一次风和二次风分别注入氧气,因此可以根据需要调整注氧比例。经过炉内脱除硫氧化物的多余烟气可以直接送至CO2压缩纯化装置进行压缩纯化,作为工业原料或封存,也可以直接经烟囱排向大气。The bed material is uniformly fluidized by the air distribution device to prevent the deposition of large particle bed materials, avoiding slagging and slag leakage, and the middle temperature cyclone separator and the flue gas recirculation fan are used to extract the medium temperature and humidity flue gas through the flue gas recirculation fan. Gas recirculation, medium temperature wet flue gas contains a large amount of water vapor, wet flue gas enters the furnace, and a large amount of water vapor is brought into the furnace, which is equivalent to humidifying the furnace and improving the desulfurization efficiency. The flue gas output through the medium temperature cyclone separator passes through a flue gas recirculation fan and is injected into the furnace through a primary oxygen oxygen injector, and is input to the furnace as a primary air; the flue gas output through the intermediate temperature cyclone is recirculated through the secondary flue gas. The fan is pressurized and injected into the furnace as a secondary air by injecting oxygen from the secondary air oxygen injector. Since the primary air and the secondary air are separately injected with oxygen, the oxygen injection ratio can be adjusted as needed. Excess flue gas from the furnace to remove sulfur oxides can be directly sent to the CO 2 compression and purification unit for compression and purification, as industrial raw materials or sealed, or directly discharged to the atmosphere through the chimney.

由于采用中温烟气注氧之后作为一次风和二次风进行再循环,为炉膛燃烧提供氧化剂,能够使循环流化床锅炉排出的CO2浓度富集到80%以上,利于煤燃烧后烟气中CO2的捕集;并且经过中温湿烟气参与再循环过程,湿烟气进入炉膛,能够将大量水蒸气带入炉内,相当于向炉内增湿,能够提高脱硫效率,因而尾部不需要设置专门的脱硫装置即可满足硫氧化物的排放要求,可以降低尾部设备的规模,降低成本。Due to the use of medium-temperature flue gas to recirculate as primary and secondary air, it provides oxidant for furnace combustion, which can enrich the CO 2 concentration discharged from the circulating fluidized bed boiler to more than 80%, which is beneficial to the flue gas after coal combustion. capture of CO 2; and the temperature and humidity in the flue gases through the recycling process involved in wet flue gas into the furnace, the furnace can be brought into a large amount of water vapor, into the furnace equivalent humidification, desulfurization efficiency can be improved, and thus the tail is not A special desulfurization device is required to meet the sulfur oxide emission requirements, which can reduce the size of the tail equipment and reduce the cost.

进一步地,为更好的实现本发明,所述引风机远离烟气预热器一端连接有烟冷器,所述烟冷器远离引风机一端通过冷烟气再循环风机与烟气预热器相连接,所述烟气预热器与播煤管相连接。对于收到基水分含量高于10%以上的煤种,需要进行处理,故采用经烟冷器冷凝脱水处理后的干冷烟气,并将干冷烟气经冷烟气再循环风机增压后作为播煤风。采用烟冷器实现冷凝脱水处理,能够避免富氧燃烧烟气再循环过程中硫氧化物、水蒸气出现富集,造成再循环烟气管道及受热面腐蚀及制粉系统干燥输送困难等问题。 Further, in order to better implement the present invention, the induced draft fan is connected to a smoke cooler at one end of the flue gas preheater, and the smoke cooler is separated from the induced draft fan by a cold flue gas recirculation fan and a flue gas preheater. Connected, the flue gas preheater is connected to the soot tube. For coals that receive more than 10% moisture content, they need to be treated. Therefore, the dry and cold flue gas after condensation and dehydration treatment by the smoke cooler is used, and the dry and cold flue gas is pressurized by the cold flue gas recirculation fan. Broadcast coal wind. The use of a smoke cooler to achieve condensing and dehydration treatment can avoid the enrichment of sulfur oxides and water vapor in the process of oxy-combustion flue gas recirculation, resulting in problems such as recirculation of flue gas pipelines and corrosion of the heated surface and difficulty in drying and conveying the milling system.

进一步地,为更好的实现本发明,所述冷烟气再循环风机远离CO2压缩纯化装置一端与罗茨风机相连接,所述罗茨风机分别与回料器、播煤管相连接。对于收到基水分含量高于10%以上的煤种,为了防止煤粉散落,本发明设置罗茨风机对经过烟冷器冷凝脱水处理后的冷烟气进行增压处理后作为播煤密封风。Further, in order to better implement the present invention, the cold flue gas recirculation fan is connected to the Roots blower at one end away from the CO 2 compression and purification device, and the Roots blower is respectively connected to the return feeder and the coal mining tube. In order to prevent coal powder from having a base moisture content of more than 10%, in order to prevent the coal powder from scattering, the present invention provides a Roots blower to pressurize the cold flue gas after being condensed and dehydrated by the smoke cooler to serve as a coal sealing wind. .

进一步地,为更好的实现本发明,所述二次烟气再循环风机的输出口与所述播煤管相连接。对于收到基水分含量不高于10%的煤种,本发明中可以采用二次烟气再循环风机出口、注氧之前的中温烟气作为播煤风。Further, in order to better implement the present invention, the output port of the secondary flue gas recirculation fan is connected to the soot tube. For the coal type that receives the base moisture content of not more than 10%, in the present invention, the secondary flue gas recirculation fan outlet and the medium temperature flue gas before the oxygen injection can be used as the coal sowing wind.

进一步地,为更好的实现本发明,所述一次烟气再循环风机的输出口与所述播煤管的入口相连接。对于收到基水分含量不高于10%的煤种,本发明中采用一次烟气再循环风机出口、注氧之前的中温烟气作为播煤密封风,用于防止煤粉反窜。Further, in order to better implement the present invention, the outlet of the primary flue gas recirculation fan is connected to the inlet of the soot pipe. For the coal type which receives the base moisture content not higher than 10%, in the present invention, the outlet of the primary flue gas recirculation fan and the medium temperature flue gas before the oxygen injection are used as the coal sealing wind to prevent the pulverized coal from ruminating.

进一步地,为更好的实现本发明,在所述省煤器与烟气预热器之间设置有烟气挡板。为了调整进入烟气预热器内的烟气的量,调整烟道中的阻力,本发明通过设置烟气挡板来调整烟道中的放热量,调整烟气挡板两侧的放热量,实现调节汽温的效果。Further, in order to better implement the present invention, a flue gas baffle is disposed between the economizer and the flue gas preheater. In order to adjust the amount of flue gas entering the flue gas preheater and adjust the resistance in the flue, the present invention adjusts the heat release amount in the flue by setting a flue gas baffle, and adjusts the heat release amount on both sides of the flue gas baffle to realize the adjustment. The effect of steam temperature.

进一步地,为更好的实现本发明,在所述布风装置上设置有石灰石添加口。可以采用向炉内添加石灰石的方式脱硫,并通过布置在炉膛出口的高温旋风分离器将经烟气携带出来的含有大量未反应的石灰石或石灰分离出来,并通过回料装置即回料器送回炉膛继续参与脱硫,提高石灰石的利用率和提高脱硫效率。采用石灰石,能够脱除烟气中的硫氧化物SOx,防止烟气中的硫氧化物随烟气循环而出现富集的问题,控制在循环烟气及排放烟气中硫氧化物浓度在合适的范围内,防止烟道及受热面酸腐蚀。Further, in order to better implement the present invention, a limestone addition port is provided on the air distribution device. Desulfurization may be carried out by adding limestone to the furnace, and a large amount of unreacted limestone or lime carried by the flue gas is separated by a high-temperature cyclone disposed at the outlet of the furnace, and sent through a returning device, that is, a returning device. The furnace is continuously involved in desulfurization, improving the utilization rate of limestone and improving the desulfurization efficiency. The use of limestone can remove the sulfur oxide SOx in the flue gas, prevent the sulfur oxides in the flue gas from enriching with the flue gas circulation, and control the concentration of sulfur oxides in the circulating flue gas and the flue gas. To prevent acid corrosion on the flue and heated surfaces.

进一步地,为更好的实现本发明,所述石灰石添加口位于所述播煤管上和/或位于所述回料器的回料腿上。石灰石添加口的位置可以根据锅炉容量来布置,对于大容量锅炉,为提高脱硫效率,保证石灰石尽可能均匀散播在炉内,石灰石添加口可以布置在播煤管的给煤口上或者回料器的回料腿上,也可以同时安装在给煤口或者回料器的回料腿上。Further, to better implement the present invention, the limestone addition port is located on the soot tube and/or on the return leg of the return feeder. The location of the limestone addition port can be arranged according to the boiler capacity. For the large-capacity boiler, in order to improve the desulfurization efficiency and ensure that the limestone is spread as evenly as possible in the furnace, the limestone addition port can be arranged on the coal supply port of the coal-seeding pipe or the return feeder. On the return leg, it can also be installed on the return leg of the coal feeder or the return feeder.

进一步地,为更好的实现本发明,在所述烟气预热器与除尘器之间设置有低温省煤器。Further, in order to better implement the present invention, a low temperature economizer is disposed between the flue gas preheater and the precipitator.

进一步地,为更好的实现本发明,在风室或风道内设置有床下点火装置。Further, in order to better implement the present invention, an under-bed ignition device is provided in the plenum or air duct.

本发明同时公开了一种循环流化床烟气再循环富氧燃烧装置的运行方 法,所述中温旋风分离器分离烟气占高温旋风分离器输出烟气的65%~80%作为再循环烟气并分别作为一次风和二次风。The invention also discloses an operating method of a circulating fluidized bed flue gas recirculation oxyfuel combustion device In the method, the medium-temperature cyclone separator separates the flue gas from 65% to 80% of the output flue gas of the high-temperature cyclone separator as the recirculated flue gas and serves as the primary air and the secondary air, respectively.

进一步地,为更好的实现本发明,高温旋风分离器输出烟气的20%~35%依次经预热器、除尘器、引风机后,抽取约15%-30%经烟冷器冷凝脱水处理,作为回料器用风和播煤用风,其余烟气送至CO2压缩纯化装置压缩或通过烟囱排入大气。Further, in order to better implement the present invention, 20% to 35% of the flue gas output from the high-temperature cyclone separator is sequentially condensed and dehydrated by the smoke cooler after being preheated, precipitated, and induced by the draft fan. The treatment is used as the wind for the returning device and the wind for the coal, and the remaining flue gas is sent to the CO 2 compression and purification device for compression or discharged into the atmosphere through the chimney.

进一步地,为更好的实现本发明,所述一次风氧注入器注入燃烧所需的40%-60%的氧气,所述二次风氧注入器注入燃烧所需60%-40%的氧气。Further, in order to better implement the present invention, the primary wind oxygen injector injects 40%-60% of oxygen required for combustion, and the secondary air oxygen injector injects 60%-40% of oxygen required for combustion. .

本发明与现有技术相比,具有以下有益效果:Compared with the prior art, the invention has the following beneficial effects:

(1)本发明采用中温烟气注氧后进行再循环,并作为床料流化介质及燃烧氧化剂,有效控制锅炉排烟中CO2浓度富集到80%以上,利于煤燃烧后烟气中CO2的捕集;(1) The invention adopts medium temperature flue gas to be recirculated after oxygen injection, and is used as bed fluidization medium and combustion oxidant to effectively control the CO 2 concentration in the boiler exhaust gas to be enriched to more than 80%, which is beneficial to the flue gas after coal combustion. CO 2 capture;

(2)本发明采用炉内石灰石脱硫,通过中温湿烟气再循环,湿烟气进入炉膛,将大量的水蒸气带入炉内,相当于向炉内增湿,提高脱硫效率,尾部不需布置专门的脱硫装置即可满足硫氧化物SOx的排放要求;(2) The invention adopts limestone desulfurization in the furnace, recycles by medium-temperature wet flue gas, and the wet flue gas enters the furnace, and brings a large amount of water vapor into the furnace, which is equivalent to humidifying the furnace, improving the desulfurization efficiency, and the tail is not needed. A special desulfurization device can be arranged to meet the SOx emission requirements of sulfur oxides;

(3)本发明采用在风道内或风室内布置床下富氧点火装置,采用床下富氧点火方式,提高循环流化床床下点火着火稳定性;(3) The invention adopts an oxygen-enriched ignition device arranged under the bed in the air duct or in the wind chamber, and adopts an oxygen-rich ignition mode under the bed to improve the ignition and ignition stability under the circulating fluidized bed;

(4)本发明采用在炉膛下部布置有布置装置,使床料均匀流化,防止大颗粒床料沉积,避免结渣和漏渣;(4) The invention adopts an arrangement device arranged in the lower part of the furnace to uniformly fluidize the bed material, prevent deposition of large particle bed materials, and avoid slagging and slag leakage;

(5)本发明采用向中温湿烟气中注氧,充分混合后作为燃烧氧化剂,并且一次风、二次风按不同比例分开注氧,能够实现根据需要调节注氧量,实现一次风和二次风含氧量的方便调节;(5) The invention adopts oxygen injection into the medium temperature and humidity flue gas, and fully mixes it as a combustion oxidant, and the primary air and the secondary air are separately injected with oxygen according to different ratios, thereby realizing the adjustment of the oxygen injection amount according to the need, realizing the primary wind and the second Convenient adjustment of the oxygen content of the secondary wind;

(6)本发明密封风和回料器用风采用未注氧的循环烟气,安全性更高;(6) The wind for sealing air and the reclaimer of the present invention adopts circulating oxygen gas without oxygen injection, and has higher safety;

(7)本发明采用中温湿烟气循环,系统尾部设备部件规模大大缩小,降低初投资和运行成本;(7) The invention adopts a medium temperature and humidity flue gas circulation, and the scale of the system tail equipment components is greatly reduced, and the initial investment and operation cost are reduced;

(8)本发明针对高水分煤采用在富氧燃烧锅炉系统中布置烟冷器,冷凝脱水处理避免富氧燃烧烟气再循环过程中硫氧化物、水蒸气出现富集,造成再循环烟气管道及受热面腐蚀及制粉系统煤粉干燥输送困难等问题。(8) The invention adopts a smoke cooler in an oxy-combustion boiler system for high-moisture coal, and condensing and dehydrating treatment avoids enrichment of sulfur oxides and water vapor in the process of oxy-combustion combustion gas recirculation, resulting in recirculated flue gas Corrosion of pipes and heated surfaces and difficulties in drying and conveying coal powder in the milling system.

附图说明DRAWINGS

图1为本发明实施例1结构示意图;1 is a schematic structural view of Embodiment 1 of the present invention;

图2为本发明实施例2结构示意图。 2 is a schematic structural view of Embodiment 2 of the present invention.

其中:101—风室;102—布风装置;103—炉膛;104—高温旋风分离器;105—回料器;106—受热面;107—省煤器;108—中温旋风分离器;109—一次烟气再循环风机;110—二次烟气再循环风机;111—一次风氧注入器;112—二次风氧注入器;113—烟气挡板;114—烟气预热器;115—除尘器;116—引风机;117—烟冷器;118—CO2压缩纯化装置;119—冷烟气再循环风机;120—罗茨风机;125—播煤管。Among them: 101—wind chamber; 102—clothing device; 103—furnace; 104—high temperature cyclone separator; 105—returner; 106—heating surface; 107—economizer; 108—medium temperature cyclone separator; Primary flue gas recirculation fan; 110 - secondary flue gas recirculation fan; 111 - primary wind oxygen injector; 112 - secondary air oxygen injector; 113 - flue gas baffle; 114 - flue gas preheater; - Dust collector; 116 - induced draft fan; 117 - smoke cooler; 118 - CO 2 compression and purification device; 119 - cold flue gas recirculation fan; 120 - Roots blower; 125 - sowing coal pipe.

具体实施方式detailed description

下面结合具体实施例对本发明进行进一步详细介绍,但本发明的实施方式不限于此。The present invention will be further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

如图1所示,该循环流化床富氧燃烧装置包括风室101、布风装置102、炉膛103、高温旋风分离器104、回料器105、受热面106、省煤器107、中温旋风分离器108、一次烟气再循环风机109、二次烟气再循环风机110、一次氧注入器111、二次氧注入器112、烟气预热器114、除尘器115、引风机116、烟冷器117、CO2压缩纯化装置118、烟冷器再循环风机119、播煤管125,运行过程中,煤和脱硫剂送入炉膛103后,立即被大量处于硫化状态中的惰性高温物料包围,充分混合,迅速着火燃烧,同时进行脱硫反应,在上升气流中,粗大粒子进入悬浮区域后在重力及外力作用下偏离主气流,从而贴壁下流,加强了炉内热量向受热面106内工质的传送,从而保证稍大煤颗粒在炉内反复循环完全燃烧。含有细小物料的气固混合物离开炉膛103后进入高温旋风分离器104,气固两相流中的大量固体颗粒(惰性物料、未燃尽的煤粒、脱硫剂)被分离出来送回至炉膛103,重新参与炉内的流化和燃烧换热,循环燃烧。As shown in FIG. 1, the circulating fluidized bed oxyfuel combustion apparatus comprises a plenum 101, an air distribution device 102, a furnace 103, a high temperature cyclone separator 104, a return feeder 105, a heating surface 106, an economizer 107, and a medium temperature cyclone. Separator 108, primary flue gas recirculation fan 109, secondary flue gas recirculation fan 110, primary oxygen injector 111, secondary oxygen injector 112, flue gas preheater 114, dust collector 115, induced draft fan 116, smoke The refrigerator 117, the CO 2 compression and purification device 118, the smoke cooler recirculation fan 119, and the coal mining pipe 125, during operation, the coal and the desulfurizing agent are sent into the furnace 103, and are immediately surrounded by a large amount of inert high-temperature materials in a vulcanized state. Fully mixed, quickly set on fire, and simultaneously desulfurization reaction. In the ascending airflow, the coarse particles enter the suspension region and deviate from the main airflow under the action of gravity and external force, thereby adhering to the downstream flow, and strengthening the heat in the furnace to the heating surface 106. The mass transfer ensures that the slightly larger coal particles are completely circulated in the furnace for complete combustion. The gas-solid mixture containing the fine material leaves the furnace 103 and enters the high-temperature cyclone separator 104. A large amount of solid particles (inert material, unburned coal particles, desulfurizing agent) in the gas-solid two-phase flow are separated and sent back to the furnace 103. Re-involved in the fluidization and combustion heat transfer in the furnace, and cycle combustion.

未被分离出来的细小粒子成为飞灰,随烟气进入尾部烟道,经过受热面106进行热量交换,经过省煤器107吸收烟气中的热量之后,经中温旋风分离器108除尘的350℃-450℃的烟气分成两路:一路为一次风回路,通过一次烟气再循环风机109升压后,进入一次风氧注入器111将燃烧所需的40%-60%的氧气注入,并通过一次风氧注入器111将氧气与循环烟气混合均匀,作为一次风,经等压风室101作为流化风通过布风装置102进入炉膛3,对床料起流化作用,并作为煤燃烧的氧化介质;另一路为二次风回路,通过二次烟气再循环风机110升压后,进入二次风氧注入器112将燃烧所需的60%-40%的氧气注入,并通过二次风氧注入器112将氧气与循环烟气混合均匀,通过二次风口进入炉膛103,为燃烧补充氧量。 The fine particles that have not been separated become fly ash, enter the tail flue with the flue gas, exchange heat through the heated surface 106, and absorb the heat in the flue gas through the economizer 107, and then remove the dust by the medium temperature cyclone 108 at 350 ° C. - 450 ° C of flue gas is divided into two ways: one way is a primary air circuit, after a single flue gas recirculation fan 109 is boosted, enters a primary oxygen injector 111 to inject 40% -60% of the oxygen required for combustion, and The oxygen and the circulating flue gas are uniformly mixed by the primary air oxygen injector 111, and as the primary air, the isostatic air chamber 101 enters the furnace 3 through the air distribution device 102 as the fluidized air, and fluidizes the bed material and acts as a coal. The combustion oxidizing medium; the other is a secondary air circuit, which is boosted by the secondary flue gas recirculation fan 110, enters the secondary air oxygen injector 112, injects 60%-40% of the oxygen required for combustion, and passes through The secondary air oxygen injector 112 mixes the oxygen and the circulating flue gas uniformly, enters the furnace 103 through the secondary tuyere, and supplements the oxygen amount for combustion.

燃料通过给煤装置进入播煤管125,在播煤风的作用下,播撒进炉膛103。播煤风的作用主要是为了保证炉内的热烟气不外窜;给给煤机下来的煤能更好的播撒进炉床内,防止燃料在播煤管125形成堆积,以使煤和炉膛103内的热物料更好的混合,促使炉膛103内温度均匀。The fuel enters the sowing pipe 125 through the coal feeding device, and is spread into the furnace 103 by the action of the coal blowing wind. The role of sowing coal wind is mainly to ensure that the hot flue gas in the furnace is not smashed; the coal that is fed to the coal feeder can be better spread into the hearth to prevent the fuel from accumulating in the sowing tube 125, so that the coal and The hot material in the furnace 103 is better mixed to promote uniform temperature in the furnace 103.

本发明所述播煤风来源可以为两种方式,对于高水分煤种(收到基水分含量高于10%以上),如图1所示,采用经烟冷器117冷凝脱水处理后的干冷烟气,干冷烟气再经过冷烟气再循环风机119增压后,经过烟气预热器114后输入到播煤管125作为播煤风;对于水分不高的煤种(收到基水分含量不高于10%),如图2所示,采用二次烟气再循环风机110出口、注氧之前的中温烟气作为播煤风。The soot blowing wind source of the present invention may be of two modes. For high-moisture coal species (receiving base moisture content is higher than 10%), as shown in FIG. 1 , dry cooling after condensation and dehydration treatment by the smoke cooler 117 is adopted. The flue gas, the dry and cold flue gas is pressurized by the cold flue gas recirculation fan 119, and then passed through the flue gas preheater 114 and then input to the sowing coal pipe 125 as the coal conveying wind; for the coal with low moisture content (receiving the base water) The content is not higher than 10%). As shown in Fig. 2, the outlet of the secondary flue gas recirculation fan 110 and the medium temperature flue gas before oxygen injection are used as the soot blowing wind.

为了防止煤粉外露污染环境,本发明对应两种来源的播煤风,相应地可以设置两种播煤密封风,对于高水分煤种,如图1所示,播煤密封风采用经烟冷器117冷凝脱水处理后的冷烟气,冷烟气再经过罗茨风机120增压后作为播煤密封风;对于水分不高的煤种,采用一次烟气再循环风机109出口、注氧之前的中温烟气作为播煤密封风。In order to prevent the pulverized coal from being exposed to the environment, the present invention corresponds to the sowing wind of two sources, and correspondingly, two kinds of coal sealing winds can be set. For the high moisture coal, as shown in Fig. 1, the coal sealing wind adopts the smoke cooling. The device 117 condenses the cold flue gas after the dehydration treatment, and the cold flue gas is pressurized by the Roots blower 120 to seal the wind as a soot seal; for the coal with low moisture content, the outlet of the primary flue gas recirculation blower 109 is used before the oxygen injection. The medium temperature flue gas acts as a sowing coal seal wind.

燃烧产生的烟气经炉膛103出口进入高温旋风分离器104,分离下来的灰粒通过高温旋风分离器104下部的回料器105送回炉膛103。从高温旋风分离器104出来的烟气经各级受热面106和省煤器107后,大部分烟气(约50%-65%)在一次烟气再循环风机109以及二次烟气再循环风机110的作用下被抽入中温旋风分离器108,烟气在中温旋风分离器108中二次除尘后,分别作为一次风和二次风;剩余的40%-30%的烟气依次经烟气预热器114、除尘器115、引风机116后,抽取约15%-30%经烟冷器117冷凝脱水处理,作为回料器105用风和播煤用风,其余的脱硫净烟气送至CO2压缩纯化装置118压缩纯化或通过烟囱排入大气。The flue gas generated by the combustion enters the high temperature cyclone 104 through the outlet of the furnace 103, and the separated ash particles are returned to the furnace 103 through the ejector 105 at the lower portion of the high temperature cyclone 104. After the flue gas from the high temperature cyclone 104 passes through the various heating surfaces 106 and the economizer 107, most of the flue gas (about 50%-65%) is in the primary flue gas recirculation fan 109 and the secondary flue gas recirculation. The fan 110 is pumped into the intermediate temperature cyclone 108, and the flue gas is dedusted in the middle temperature cyclone 108 for secondary air and secondary air respectively; the remaining 40%-30% of the flue gas passes through the smoke in turn. After the gas preheater 114, the precipitator 115, and the induced draft fan 116, approximately 15%-30% of the exhausted chiller 117 is condensed and dehydrated, and the wind is used as the returning device 105 for wind and coal, and the remaining desulfurized net flue gas. It is sent to a CO 2 compression purification unit 118 for compression purification or discharge into the atmosphere through a chimney.

循环流化床锅炉对煤种的适应性较煤粉炉好,污染物排放也比煤粉炉低。对于富氧燃烧煤粉炉而言,由于制粉系统需要采用大量的循环干烟气作为煤粉干燥和输送的介质,锅炉尾部烟风系统需要布置体积庞大的脱硫装置和烟冷器。采用热烟气再循环的循环流化床富氧燃烧技术作为一种全新的燃烧方式,在燃煤电厂实现污染物的较低排放和大规模化CO2富集、减排将具有较大的潜力。The circulating fluidized bed boiler has better adaptability to coal types than the pulverized coal stove, and the pollutant discharge is also lower than that of the pulverized coal stove. For the oxy-combustion pulverized coal furnace, since the pulverizing system needs to use a large amount of circulating dry flue gas as the medium for drying and conveying pulverized coal, the flue gas system of the boiler tail needs to arrange a bulky desulfurization device and a smoke chiller. Circulating fluidized bed oxyfuel combustion technology using hot flue gas recirculation as a new combustion method, achieving lower emission of pollutants and large-scale CO 2 enrichment and emission reduction in coal-fired power plants will have a larger potential.

实施例1:Example 1:

如图1所示,本实施例中公开了一种循环流化床富氧燃烧装置,包括风室101、 设置在风室101上方的布风装置102和设置在布风装置102上方的炉膛103,在所述炉膛103上部连接有高温旋风分离器104,在所述高温旋风分离器104上部连接有受热面106,在所述受热面106下部连接有省煤器107,所述高温旋风分离器104下端通过回料器105与布风装置102相连接,所述省煤器107下部连接有中温旋风分离器108,所述中温旋风分离器108依次通过一次烟气再循环风机109和一次风氧注入器111与风室101相连接,并且所述中温旋风分离器108下部依次通过二次烟气再循环风机110和二次风氧注入器112与布风装置102相连接,所述省煤器107下部依次通过烟气预热器114、除尘器115与引风机116相连接,所述引风机116远离烟气预热器114一端与CO2压缩纯化装置118相连接,在所述布风装置102上设置有播煤管125。As shown in FIG. 1 , a circulating fluidized bed oxyfuel combustion apparatus is disclosed in the present embodiment, including a plenum 101, an air distribution device 102 disposed above the air chamber 101, and a furnace 103 disposed above the air distribution device 102. A high temperature cyclone separator 104 is connected to the upper portion of the furnace 103, a heating surface 106 is connected to the upper portion of the high temperature cyclone separator 104, and an economizer 107 is connected to the lower portion of the heating surface 106. The high temperature cyclone separator is connected to the lower portion of the heating surface 106. The lower end of the 104 is connected to the air distribution device 102 through a recirculator 105. The lower portion of the economizer 107 is connected with a medium temperature cyclone 108. The medium temperature cyclone 108 passes through the primary flue gas recirculation fan 109 and the primary air oxygen. The injector 111 is connected to the plenum 101, and the lower portion of the intermediate vortex separator 108 is sequentially connected to the air distribution device 102 through the secondary flue gas recirculation fan 110 and the secondary air oxygen injector 112, the economizer The lower portion of the 107 is sequentially connected to the induced draft fan 116 through the flue gas preheater 114 and the dust remover 115. The induced draft fan 116 is connected to the CO 2 compression and purification device 118 at one end away from the flue gas preheater 114. 102 has set coal 125.

本实施例中,采用高温旋风分离器104和中温旋风分离器108,一次烟气再循环风机109输出的烟气经过一次风氧注入器111混合氧气之后作为一次风,二次烟气再循环风机110输出的烟气经过二次风氧注入器112混合氧气之后作为二次风,由于一次风和二次风军采用省煤器出口的烟气,一次烟气再循环风机109和二次烟气再循环风机110均采用独立配置,一次风和二次风均采用分开不同比例注氧,可以方便分别控制一次风和二次风的风量,进而有效控制炉膛103内物料流化。而回料器105用风和播煤管125用风均可采用经烟冷器117冷凝脱水的烟气。In this embodiment, the high temperature cyclone separator 104 and the medium temperature cyclone separator 108 are used, and the flue gas outputted by the primary flue gas recirculation fan 109 is mixed with oxygen through the primary air oxygen injector 111 as a primary air, secondary flue gas recirculation fan. The flue gas outputted by the 110 is used as a secondary air after the oxygen is mixed by the secondary wind oxygen injector 112. Since the primary air and the secondary wind force use the flue gas of the economizer outlet, the primary flue gas recirculation fan 109 and the secondary flue gas The recirculating fan 110 is independently configured, and the primary air and the secondary air are separately injected with different proportions of oxygen, which can conveniently control the air volume of the primary air and the secondary air separately, thereby effectively controlling the fluidization of the material in the furnace 103. The returning device 105 can use the wind and the sowing tube 125 to use the wind to condense and dehydrate the flue gas.

为了使输入到烟气预热器114的风具有一定压力,优选地,本实施例中,所述省煤器107与烟气预热器114之间设置有烟气挡板113。通过设置烟气挡板113,能够在风管内形成一个屏障,使烟气挡板113两侧的烟气不会互窜,实现密封作用。In order to make the wind input to the flue gas preheater 114 have a certain pressure, preferably, in the embodiment, a flue gas baffle 113 is disposed between the economizer 107 and the flue gas preheater 114. By providing the flue gas baffle 113, a barrier can be formed in the air duct so that the flue gases on both sides of the flue gas baffle 113 do not collide with each other to achieve a sealing effect.

为了提高本装置的脱硫效果,本实施例中,优选地,在所述布风装置102上设置有石灰石添加口。循环流化床锅炉内添加石灰石,在正常运行床温(850℃-900℃)下,石灰粉被煅烧成氧化钙(850℃是钙基脱硫剂最佳脱硫温度),从而达到与二氧化硫结合脱硫效果。煤及石灰石燃烧后,大部分颗粒经旋风分离器进行气固分离,从底部被送回炉膛103。石灰石脱硫剂在流化床燃烧室内的脱硫性能,通常采用以脱除一定含量SO2所添加的CaCO3与煤中含硫量的物质的量之比来表示,称为摩尔比。本发明中,一次风和二次风均为含有大量水蒸气的湿烟气,其进入炉内相当于向炉内增湿,起到增湿脱硫的效果,可以大大提高脱硫效率,可省略尾部脱硫系统。优选地,本实施例中,石灰石添加口位于所述 播煤管125上或位于所述回料器105的回料腿上。In order to improve the desulfurization effect of the apparatus, in the present embodiment, preferably, the air distribution device 102 is provided with a limestone addition port. Limestone is added to the circulating fluidized bed boiler. At normal operating bed temperature (850 °C-900 °C), the lime powder is calcined into calcium oxide (850 °C is the optimal desulfurization temperature of the calcium-based desulfurizer) to achieve desulfurization combined with sulfur dioxide. effect. After the coal and limestone are burned, most of the particles are gas-solid separated by a cyclone and returned to the furnace 103 from the bottom. The desulfurization performance of the limestone desulfurizer in the fluidized bed combustion chamber is usually expressed by the ratio of the amount of CaCO 3 added to remove a certain amount of SO 2 and the amount of sulfur in the coal, which is called a molar ratio. In the present invention, both the primary air and the secondary air are wet flue gas containing a large amount of water vapor, and entering the furnace is equivalent to humidifying the furnace, thereby exerting the effect of humidifying and desulfurizing, and can greatly improve the desulfurization efficiency, and the tail can be omitted. Desulfurization system. Preferably, in the present embodiment, the limestone addition port is located on the sowing pipe 125 or on the return leg of the hopper 105.

为了保证除尘器115的安全运行,本实施例中,优选地,在所述烟气预热器114与除尘器115之间设置有低温省煤器。低温省煤器能将烟气温度降到除尘器115允许的温度范围,确保除尘器115的安全运行,同时,能够起到吸收烟气余热的作用,回收部分余热,实现热量利用。In order to ensure safe operation of the dust remover 115, in the present embodiment, preferably, a low temperature economizer is disposed between the flue gas preheater 114 and the dust remover 115. The low temperature economizer can reduce the temperature of the flue gas to the temperature range allowed by the precipitator 115, ensure the safe operation of the precipitator 115, and at the same time, absorb the residual heat of the flue gas, recover part of the residual heat, and realize the heat utilization.

优选地,本发明采用采用床下点火装置实现点火,即风室101或风道内设置有床下点火装置。将点火装置设置在风室101内时,将点火装置设置在风室101后侧,在循环流化床布风板以下两个等压风室101后侧各设一台,每台点火装置配一只点火油枪,一次风出来后,分别从风室101两侧和两台点火装置进入一次风室101,在主风道及每台点火装置上设置风门。Preferably, the present invention employs an under-bed ignition device for ignition, i.e., an under-bed ignition device is provided in the plenum 101 or in the air duct. When the ignition device is disposed in the air chamber 101, the ignition device is disposed on the rear side of the air chamber 101, and one of the two equal pressure air chambers 101 is disposed below the circulating fluidized bed air distribution plate, and each ignition device is provided. An ignition oil gun, after the primary air comes out, enters the primary air chamber 101 from both sides of the air chamber 101 and the two ignition devices, and the damper is arranged on the main air passage and each ignition device.

本实施例中,布风装置102上设置有排渣口,利用气固两相流的流动性将多余的物料排出炉膛103,从而实现炉内物料进出的平衡,维持物料在合理范围。In this embodiment, the air distribution device 102 is provided with a slag discharge port, and the excess material is discharged from the furnace 103 by the fluidity of the gas-solid two-phase flow, thereby achieving balance of material in and out of the furnace, and maintaining the material in a reasonable range.

申请人实验发现,本发明循环流化床富氧燃烧装置,经省煤器107后的尾部除尘器115和引风机116的烟气量仅相当于常规空气燃烧的约30%,经烟冷器117的烟气也仅为总烟气量的5%-10%,尾部烟风系统的设备部件规模大为缩小,能够起到降低初投资及运行成本的效果。Applicant's experiments have found that the circulating fluidized bed oxyfuel combustion apparatus of the present invention has a flue gas volume of only about 30% of the conventional air combustion after the economizer 107, and the smoke exhauster is only about 30% of the conventional air combustion. The flue gas of 117 is only 5%-10% of the total flue gas volume, and the scale of the equipment components of the tail flue gas system is greatly reduced, which can reduce the initial investment and operating cost.

实施例2:Example 2:

本实施例在实施例1的基础上,所述冷烟气再循环风机119远离CO2压缩纯化装置118一端与罗茨风机120相连接,所述罗茨风机120分别与回料器105、播煤管125相连接。所述二次烟气再循环风机110的输出口与所述播煤管125相连接。In this embodiment, on the basis of Embodiment 1, the cold flue gas recirculation fan 119 is connected to the Roots blower 120 at one end away from the CO 2 compression and purification device 118, and the Roots blower 120 and the return feeder 105, respectively. The coal pipes 125 are connected. An output port of the secondary flue gas recirculation fan 110 is connected to the soot tube 125.

如图2所示,从高温旋风分离器104出来的烟气经各级受热面106和省煤器107后,烟气分成两部分,一部分进入中温旋风分离器108(约占烟气的70%),另一部分经尾部除尘器等进入CO2压缩纯化装置118压缩纯化或者经烟囱排入大气。经中温旋风分离器108除尘的烟气分成三路:一路作为一次风回路,经过一次烟气再循环风机109升压进入一次风氧注入器111,从而将燃烧所需的40%-60%的氧气注入,并通过一次风氧注入器111将氧气与循环烟气混合均匀,作为一次风,经等压风室101后作为流化风通过布风装置102进入炉膛103,对床料起流化作用,并作为煤燃烧的氧化介质,并在一次烟气再循环风机109出口、一次风氧注入器111前抽取一部分作为播煤风;第二路为二次回路,通过二次烟气再循环风机110升压后,进入二次风氧注入器112将燃烧所需的60%-40%的 氧气注入,并通过二次风氧注入器112将氧气与循环烟气混合,通过二次风口进入炉膛103,为煤燃烧补充氧气;第三路为罗茨风回路,通过罗茨风机120升压后,一部分作为回料器105的流化风、回料风、松动风,一部分作为锅炉测点等的密封风。As shown in FIG. 2, after the flue gas from the high temperature cyclone 104 passes through the heating surface 106 and the economizer 107, the flue gas is divided into two parts, and a part enters the intermediate temperature cyclone 108 (about 70% of the flue gas). The other part is compressed or purified by a tail filter or the like into the CO 2 compression and purification unit 118 or discharged into the atmosphere through a chimney. The flue gas dedusted by the medium temperature cyclone separator 108 is divided into three paths: one path is used as the primary air circuit, and is boosted into the primary air oxygen injector 111 by the primary flue gas recirculation fan 109, thereby 40%-60% of the required combustion. The oxygen is injected, and the oxygen and the circulating flue gas are uniformly mixed by the primary air oxygen injector 111. As the primary air, after the isostatic air chamber 101, the fluidized air enters the furnace 103 through the air distribution device 102, and the bed material is fluidized. Acting as an oxidizing medium for coal combustion, and extracting a part of the flue gas recirculation fan 109 at the outlet of the primary flue gas recirculation fan 111 as a soot blowing wind; the second circuit is a secondary circuit, which is recirculated through the secondary flue gas. After the fan 110 is boosted, the secondary air oxygen injector 112 is injected to inject 60%-40% of the oxygen required for combustion, and the oxygen is mixed with the circulating flue gas through the secondary air oxygen injector 112, and enters through the secondary air inlet. The furnace 103 is supplemented with oxygen for coal combustion; the third road is the Roots wind circuit, and after being boosted by the Roots blower 120, part of it is used as the fluidizing wind, returning wind, loose wind of the returning device 105, and part of it is used as the boiler measuring point. Seal .

尾部进入CO2压缩纯化装置118压缩纯化或烟囱排入大气的烟气,在除尘器115之前通过低温省煤器实现降温。The tail enters the CO 2 compression and purification unit 118 to compress and purify the flue gas discharged into the atmosphere by the chimney, and the temperature is lowered by the low temperature economizer before the precipitator 115.

实施例3:Example 3:

本实施例中,为了保证循环流化床锅炉燃烧过程中的稳定运行,将烟气再循环倍率设置在65%~80%之间,即将中温旋风分离器108分离烟气占高温旋风分离器104输出烟气的65%~80%作为再循环烟气并分别作为一次风和二次风。通过将再循环倍率控制在该范围,通过采用中温烟气作为再循环风,在对其进行注氧后进行再循环,使其作为床料流化介质及燃烧氧化剂,有效控制锅炉排烟中CO2浓度富集到80%以上,利于煤燃烧后烟气中CO2的捕集;相应地,高温旋风分离器104输出烟气的20%~35%依次经烟气预热器114、除尘器115、引风机116后,抽取约15%-30%经烟冷器117冷凝脱水处理,作为回料器105用风和播煤用风,其余烟气送至CO2压缩纯化装置118压缩或通过烟囱排入大气。由于将中温湿烟气进行循环,能够使系统尾部设备部件规模大大缩小,降低初投资和运行成本,而由于针对高水分煤采用在富氧燃烧锅炉系统中布置烟冷器,冷凝脱水处理避免富氧燃烧烟气再循环过程中硫氧化物、水蒸气出现富集,造成再循环烟气管道及受热面腐蚀及制粉系统煤粉干燥输送困难等问题。 In this embodiment, in order to ensure stable operation in the combustion process of the circulating fluidized bed boiler, the flue gas recirculation rate is set between 65% and 80%, that is, the medium temperature cyclone separator 108 separates the flue gas from the high temperature cyclone separator 104. 65% to 80% of the output flue gas is used as the recirculated flue gas and is used as the primary air and the secondary air, respectively. By controlling the recirculation rate within this range, by using medium temperature flue gas as the recirculation wind, it is recirculated after oxygen injection, and is used as a bed fluidization medium and combustion oxidant to effectively control CO in the boiler exhaust. 2 concentration enrichment of more than 80%, which is conducive to the capture of CO 2 in the flue gas after coal combustion; correspondingly, 20% to 35% of the flue gas output from the high-temperature cyclone 104 is sequentially passed through the flue gas preheater 114 and the precipitator 115. After the induced draft fan 116, about 15%-30% is extracted and condensed and dehydrated by the smoke cooler 117, and the wind is used as the returning device 105 for wind and coal, and the remaining flue gas is sent to the CO 2 compression and purification device 118 for compression or passage. The chimney is discharged into the atmosphere. Due to the circulation of the medium temperature and humidity flue gas, the scale of the tail equipment parts of the system can be greatly reduced, and the initial investment and operating cost can be reduced. Since the smoke cooler is arranged in the oxyfuel combustion boiler system for the high moisture coal, the condensation dehydration treatment avoids the rich. Oxygen oxides and water vapors are enriched during the oxyfuel combustion flue gas recycling process, causing problems such as recirculation of flue gas pipes and corrosion of heated surfaces and difficulty in conveying and conveying coal powder in the milling system.

Claims (13)

  1. 循环流化床富氧燃烧装置,包括风室(101)、设置在风室(101)上方的布风装置(102)和设置在布风装置(102)上方的炉膛(103),在所述炉膛(103)上部连接有高温旋风分离器(104),在所述高温旋风分离器(104)上部连接有受热面(106),在所述受热面(106)下部连接有省煤器(107),其特征在于:所述高温旋风分离器(104)下端通过回料器(105)与布风装置(102)相连接,所述省煤器(107)下部连接有中温旋风分离器(108),所述中温旋风分离器(108)依次通过一次烟气再循环风机(109)和一次风氧注入器(111)与风室(101)相连接,并且所述中温旋风分离器(108)下部依次通过二次烟气再循环风机(110)和二次风氧注入器(112)与布风装置(102)相连接,所述省煤器(107)下部依次通过烟气预热器(114)、除尘器(115)与引风机(116)相连接,所述引风机(116)远离烟气预热器(114)一端与CO2压缩纯化装置(118)相连接,在所述布风装置(102)上设置有播煤管(125)。a circulating fluidized bed oxyfuel combustion apparatus comprising a plenum (101), an air distribution device (102) disposed above the air chamber (101), and a furnace (103) disposed above the air distribution device (102), A high temperature cyclone (104) is connected to an upper portion of the furnace (103), a heating surface (106) is connected to an upper portion of the high temperature cyclone (104), and an economizer (107) is connected to a lower portion of the heating surface (106). And characterized in that: the lower end of the high-temperature cyclone (104) is connected to the air distribution device (102) through a return device (105), and the middle portion of the economizer (107) is connected with a medium-temperature cyclone separator (108). The medium temperature cyclone (108) is sequentially connected to the plenum (101) through a primary flue gas recirculation fan (109) and a primary oxy-injector (111), and the intermediate temperature cyclone (108) The lower part is sequentially connected to the air distribution device (102) through the secondary flue gas recirculation fan (110) and the secondary air oxygen injector (112), and the lower part of the economizer (107) sequentially passes the flue gas preheater ( 114), filter (115) and the induced draft fan (116) is connected to the induced draft fan (116) away from the flue gas preheater (114) is connected with the compressed CO 2 purification means (118) is connected to the Wind means (102) is provided with a broadcast on the coal pipe (125).
  2. 根据权利要求2所述的循环流化床富氧燃烧装置,其特征在于:所述引风机(116)远离烟气预热器(114)一端连接有烟冷器(117),所述烟冷器(117)远离引风机(116)一端通过冷烟气再循环风机(119)与烟气预热器(114)相连接,所述烟气预热器(114)与播煤管(125)相连接。The circulating fluidized bed oxyfuel combustion apparatus according to claim 2, wherein the induced draft fan (116) is connected to a smoke cooler (117) at one end of the flue gas preheater (114), and the smoke is cold. The device (117) is connected to the flue gas preheater (114) through a cold flue gas recirculation fan (119) away from the end of the induced draft fan (116), the flue gas preheater (114) and the coal mining tube (125) Connected.
  3. 根据权利要求2所述的循环流化床富氧燃烧装置,其特征在于:所述冷烟气再循环风机(119)远离CO2压缩纯化装置(118)一端与罗茨风机(120)相连接,所述罗茨风机(120)分别与回料器(105)、播煤管(125)相连接。The circulating fluidized bed oxyfuel combustion apparatus according to claim 2, wherein the cold flue gas recirculation fan (119) is connected to the Roots blower (120) at one end away from the CO 2 compression and purification unit (118). The Roots blower (120) is connected to the return feeder (105) and the coal seeding pipe (125), respectively.
  4. 根据权利要求1所述的循环流化床富氧燃烧装置,其特征在于:所述二次烟气再循环风机(110)的输出口与所述播煤管(125)相连接。The circulating fluidized bed oxyfuel combustion apparatus according to claim 1, characterized in that the output port of the secondary flue gas recirculation fan (110) is connected to the soot tube (125).
  5. 根据权利要求4所述的循环流化床富氧燃烧装置,其特征在于:所述一次烟气再循环风机(109)的输出口与所述播煤管(125)的入口相连接。The circulating fluidized bed oxyfuel combustion apparatus according to claim 4, characterized in that the outlet of the primary flue gas recirculation fan (109) is connected to the inlet of the soot tube (125).
  6. 根据权利要求1-5任一项所述的循环流化床富氧燃烧装置,其特征在于:在所述省煤器(107)与烟气预热器(114)之间设置有烟气挡板(113)。The circulating fluidized bed oxyfuel combustion apparatus according to any one of claims 1 to 5, characterized in that a smoke block is arranged between the economizer (107) and the flue gas preheater (114). Board (113).
  7. 根据权利要求1-5任一项所述的循环流化床富氧燃烧装置,其特征在于:在所述布风装置(102)上设置有石灰石添加口。The circulating fluidized bed oxyfuel combustion apparatus according to any one of claims 1 to 5, characterized in that the air distribution means (102) is provided with a limestone addition port.
  8. 根据权利要求7所述的循环流化床富氧燃烧装置,其特征在于:所述石灰石添加口位于所述播煤管(125)上和/或位于所述回料器(105)的回料腿上。The circulating fluidized bed oxyfuel combustion apparatus according to claim 7, wherein the limestone addition port is located on the coal dressing pipe (125) and/or is located at the returning device (105). On the leg.
  9. 根据权利要求1-5任一项所述的循环流化床富氧燃烧装置,其特征在于:在所 述烟气预热器(114)与除尘器(115)之间设置有低温省煤器。A circulating fluidized bed oxyfuel combustion apparatus according to any one of claims 1 to 5, characterized in that A low temperature economizer is disposed between the flue gas preheater (114) and the precipitator (115).
  10. 根据权利要求1-5任一项所述的循环流化床富氧燃烧装置,其特征在于:在风室(101)或风道内设置有床下点火装置。A circulating fluidized bed oxyfuel combustion apparatus according to any one of claims 1 to 5, characterized in that a bed under ignition device is provided in the plenum chamber (101) or the air duct.
  11. 根据权利要求1-10任一项所述的循环流化床富氧燃烧装置的运行方法,其特征在于:所述中温旋风分离器(108)分离烟气占高温旋风分离器(104)输出烟气的65%~80%作为再循环烟气并分别作为一次风和二次风。The operating method of a circulating fluidized bed oxyfuel combustion apparatus according to any one of claims 1 to 10, characterized in that the medium temperature cyclone separator (108) separates the flue gas from the high temperature cyclone separator (104). 65% to 80% of the gas is used as recycled flue gas and is used as primary air and secondary air, respectively.
  12. 根据权利要求11所述的循环流化床富氧燃烧装置的运行方法,其特征在于:高温旋风分离器(104)输出烟气的20%~35%依次经烟气预热器(114)、除尘器(115)、引风机(116)后,抽取约15%-30%经烟冷器(117)冷凝脱水处理,作为回料器(105)用风和播煤用风,其余烟气送至CO2压缩纯化装置(118)压缩或通过烟囱排入大气。The operating method of the circulating fluidized bed oxyfuel combustion apparatus according to claim 11, characterized in that: 20% to 35% of the output of the high-temperature cyclone (104) is sequentially passed through the flue gas preheater (114), After the dust collector (115) and the induced draft fan (116), about 15%-30% of the smoke cooler (117) is condensed and dehydrated, and used as the returning device (105) for wind and coal, and the rest of the smoke is sent. The CO 2 compression purification unit (118) is compressed or discharged into the atmosphere through a chimney.
  13. 根据权利要求11所述的循环流化床富氧燃烧装置的运行方法,其特征在于:所述一次风氧注入器(111)注入燃烧所需的40%-60%的氧气,所述二次风氧注入器(112)注入燃烧所需60%-40%的氧气。 The operating method of a circulating fluidized bed oxyfuel combustion apparatus according to claim 11, wherein said primary air oxygen injector (111) injects 40% to 60% of oxygen required for combustion, said second The wind oxygen injector (112) injects 60%-40% of the oxygen required for combustion.
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