CN106705108A - High-temperature flue gas oxygen-doped type oxygen-enriched combustion steam-injection boiler - Google Patents
High-temperature flue gas oxygen-doped type oxygen-enriched combustion steam-injection boiler Download PDFInfo
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- CN106705108A CN106705108A CN201611242748.8A CN201611242748A CN106705108A CN 106705108 A CN106705108 A CN 106705108A CN 201611242748 A CN201611242748 A CN 201611242748A CN 106705108 A CN106705108 A CN 106705108A
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 239000001301 oxygen Substances 0.000 title claims abstract description 60
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 60
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 55
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 239000003546 flue gas Substances 0.000 title claims abstract description 51
- 238000010793 Steam injection (oil industry) Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 63
- 239000007789 gas Substances 0.000 claims abstract description 14
- 230000005855 radiation Effects 0.000 claims abstract description 11
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229920006395 saturated elastomer Polymers 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims 1
- 239000000446 fuel Substances 0.000 abstract description 13
- 239000003344 environmental pollutant Substances 0.000 abstract 1
- 231100000719 pollutant Toxicity 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 10
- 230000007423 decrease Effects 0.000 description 6
- 239000000295 fuel oil Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000012528 membrane Substances 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000009841 combustion method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003623 enhancer Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
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- 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
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- 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
-
- 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
- F23L2900/07001—Injecting synthetic air, i.e. a combustion supporting mixture made of pure oxygen and an inert gas, e.g. nitrogen or recycled fumes
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- 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
- Y02E20/32—Direct CO2 mitigation
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
Description
技术领域technical field
本发明涉及一种稠油开采用高温烟气掺氧式富氧燃烧注汽锅炉。The invention relates to an oxygen-enriched combustion steam-injection boiler for high-temperature flue gas mixed with oxygen for heavy oil development.
背景技术Background technique
油田注汽锅炉是稠油开采的关键设备之一。目前运行的注汽锅炉为了提高锅炉热效率，节约燃料，采取各种措施，如采用高效保温材料，加装烟气余热回收装置，燃油改烧燃气，改变燃烧方式等，其中节能效果显著的是采用富氧燃烧技术，节能率在4%以上。在富氧燃烧条件下，火焰温度升高，燃烧速度加快，燃烧完全程度提高，燃料的燃点温度降低，燃烬时间缩短，过量空气系数降低，烟气量减少；但其存在的最大问题是NOx排放浓度较高。这主要是因为：助燃剂中N2浓度降低，致使热力型NOx的生成量降低，但火焰温度的提高和氧气浓度的提高却能增加热力型NOx的生成量，且NOx的增加速度要高于NOx的降低速度，最终NOx排放量还是增加。Oilfield steam injection boiler is one of the key equipment for heavy oil exploitation. In order to improve the thermal efficiency of the boiler and save fuel, the currently operating steam injection boilers have adopted various measures, such as using high-efficiency insulation materials, installing flue gas waste heat recovery devices, changing fuel oil to gas, and changing combustion methods, among which the energy-saving effect is remarkable. Oxygen-enriched combustion technology, the energy saving rate is above 4%. Under the condition of oxygen-enriched combustion, the flame temperature increases, the combustion speed increases, the completeness of combustion increases, the ignition temperature of the fuel decreases, the burnout time shortens, the excess air coefficient decreases, and the amount of smoke decreases; but the biggest problem is NO x emission concentration is higher. This is mainly because: the reduction of the N 2 concentration in the combustion oxidizer leads to a decrease in the generation of thermal NOx , but the increase of the flame temperature and the increase of the oxygen concentration can increase the generation of thermal NOx , and the increase rate of NOx Even higher than the NOx reduction rate, the final NOx emissions still increase.
设想将烟气循环技术和富氧燃烧技术结合应用于注汽锅炉中，必将改善燃烧效果，节约燃料消耗量，降低NOx排放，达到油田企业提高经济效益与节能环保的双重目的。因此，成为本领域一直渴望解决的技术难题。It is assumed that the combination of flue gas circulation technology and oxygen-enriched combustion technology will be applied to steam injection boilers, which will surely improve the combustion effect, save fuel consumption, reduce NOx emissions, and achieve the dual goals of improving economic benefits and energy conservation and environmental protection for oilfield enterprises. Therefore, become the technical problem that this field longs to solve all the time.
发明内容Contents of the invention
本发明解决的技术问题是提供一种稠油开采用高温烟气掺氧式富氧燃烧注汽锅炉，该注汽锅炉能够大幅提高锅炉热效率，节约能源，降低NOx排放浓度。The technical problem solved by the present invention is to provide a high-temperature flue gas oxygen-mixed oxygen-enriched combustion steam-injection boiler for heavy oil development. The steam-injection boiler can greatly improve the thermal efficiency of the boiler, save energy, and reduce the concentration of NO x emissions.
本发明的目的通过以下技术方案实现：The object of the present invention is achieved through the following technical solutions:
高温烟气掺氧式富氧燃烧注汽锅炉，包括富氧发生装置、助燃剂配比与预热装置、炉体、辐射段、对流段、给水泵、混水器、汽水分离器、集联箱和燃烧器；所述的富氧发生装置和助燃剂配比与预热装置相连；辐射段设置在炉体内腔；对流段设置在炉体外侧；混水器连通给水泵、对流段及集联箱，汽水分离器连通辐射段及集联箱，燃烧器连通炉体和混气罐。High-temperature flue gas oxygen-mixed oxygen-enriched combustion steam injection boiler, including oxygen-enriched generator, combustion aid ratio and preheating device, furnace body, radiant section, convection section, feed water pump, water mixer, steam-water separator, integrated box and burner; the oxygen-enriched generating device and the ratio of the combustion aid are connected to the preheating device; the radiation section is set in the inner cavity of the furnace; the convection section is set outside the furnace body; the water mixer is connected to the feed pump, the convection section and the collector The header, the steam-water separator is connected to the radiant section and the header box, and the burner is connected to the furnace body and the gas mixing tank.
所述的富氧发生装置由鼓风机、膜式富氧发生器和纯氧储罐依次连接构成。The oxygen-enriched generating device is composed of a blower, a membrane-type oxygen-enriched generator and a pure oxygen storage tank connected in sequence.
所述的助燃剂配比与预热装置由烟气循环管道、混气罐、循环风机组成，混气罐通过烟气循环管道连通循环风机。The combustion aid proportioning and preheating device is composed of a flue gas circulation pipe, a gas mixing tank, and a circulation fan, and the gas mixing tank is connected to the circulation fan through the flue gas circulation pipe.
所述的助燃剂配比与预热装置内的助燃剂为高温烟气与氧气的混合气。The ratio of the combustion aid and the combustion aid in the preheating device is a mixture of high-temperature flue gas and oxygen.
所述的助燃剂中的氧气浓度控制在25%-40%。The oxygen concentration in the combustion accelerant is controlled at 25%-40%.
所述的对流段、汽水分离器和集联箱布置在炉体外侧。The convection section, the steam-water separator and the header box are arranged outside the furnace body.
所述的集联箱连接有排污阀。The header box is connected with a drain valve.
所述的集联箱与混水器之间饱和水管道Ⅵ上设置有止回阀。A check valve is set on the saturated water pipeline VI between the header box and the water mixer.
本发明的优点在于：抽取注汽锅炉尾部一部分高温烟气（烟气温度可达1000℃）与纯氧混合形成高温富氧助燃剂，形成高温富氧燃烧技术，将其应用在注汽锅炉上。高温烟气多次循环后，形成富含CO2高温烟气。引用富含CO2高温烟气循环技术克服了富氧燃烧方式带来的高NOx排放浓度的问题，燃料利用率比常规注汽锅炉提高15%以上，产汽率提高10%以上，烟气中NOx的排放浓度减少50％以上。同时燃料使用可以多样化，不论是高热值燃料还是低热值燃料，不论是液体燃料、气体燃料还是固体燃料均可应用此装置。The advantage of the present invention is that a part of the high-temperature flue gas (flue gas temperature can reach 1000°C) at the tail of the steam injection boiler is mixed with pure oxygen to form a high-temperature oxygen-enriched combustion aid, forming a high-temperature oxygen-enriched combustion technology, and applying it to the steam injection boiler . After the high-temperature flue gas circulates for many times, high-temperature flue gas rich in CO2 is formed. The high-temperature flue gas circulation technology rich in CO 2 overcomes the problem of high NO x emission concentration caused by the oxygen-enriched combustion method. The emission concentration of NOx in the medium is reduced by more than 50%. At the same time, the use of fuel can be diversified, whether it is high calorific value fuel or low calorific value fuel, whether it is liquid fuel, gas fuel or solid fuel, this device can be applied.
附图说明Description of drawings
图1为高温烟气掺氧式富氧燃烧注汽锅炉的示意图。Figure 1 is a schematic diagram of a high-temperature flue gas-doped oxygen-enriched combustion steam injection boiler.
图中：1为鼓风机，2为膜式富氧发生器，3为储氧罐，4为混气罐，5为燃烧器，6为辐射段，7为循环风机，8为对流段，9为混水器，10为给水泵，11为汽水分离器，12为集联箱，13为排污阀，14为止回阀，15为管道I，16为管道II，17为管道III，18为燃料入口管道，19为烟气循环管道，20为低温烟气排出管道，21为经过处理的带压软化除氧水，22为管道Ⅳ，23为管道Ⅴ，24为饱和蒸汽出口，25为管道Ⅵ。In the figure: 1 is the blower, 2 is the membrane oxygen generator, 3 is the oxygen storage tank, 4 is the gas mixing tank, 5 is the burner, 6 is the radiation section, 7 is the circulation fan, 8 is the convection section, 9 is the Water mixer, 10 is feed water pump, 11 is steam-water separator, 12 is header tank, 13 is drain valve, 14 is check valve, 15 is pipeline I, 16 is pipeline II, 17 is pipeline III, 18 is fuel inlet Pipeline, 19 is a flue gas circulation pipe, 20 is a low-temperature flue gas discharge pipe, 21 is treated pressure softened deoxygenated water, 22 is pipe IV, 23 is pipe V, 24 is a saturated steam outlet, and 25 is pipe VI.
具体实施方式detailed description
下面结合附图对本发明做进一步详细描述。The present invention will be described in further detail below in conjunction with the accompanying drawings.
实施例Example
如图1所示，本发明高温烟气掺氧式富氧燃烧注汽锅炉包括富氧发生装置、助燃剂配比与预热装置、炉体、辐射段、对流段、给水泵10、混水器9、汽水分离器11、集联箱12和燃烧器5。富氧发生装置由鼓风机1、膜式富氧发生器2、纯氧储罐3依次连接构成；助燃剂配比与预热装置由烟气循环管道19、混气罐4、循环风机7组成，混气罐通过烟气循环管道连通循环风机；辐射段6设置在炉体内腔；对流段8设置在炉体外侧；混水器9分别与给水泵10、对流段8及集联箱12连通，汽水分离器11分别与辐射段6及集联箱12连通，燃烧器5分别与炉体和混气罐4连通。As shown in Figure 1, the high-temperature flue gas oxygen-mixed oxygen-enriched combustion steam injection boiler of the present invention includes an oxygen-enriched generating device, a combustion aid proportioning and preheating device, a furnace body, a radiation section, a convection section, a feed water pump 10, a mixing water device 9, steam-water separator 11, header 12 and burner 5. The oxygen-enriched generating device is composed of a blower 1, a membrane-type oxygen-enriched generator 2, and a pure oxygen storage tank 3; The gas mixing tank is connected to the circulating fan through the flue gas circulation pipe; the radiation section 6 is set in the inner cavity of the furnace body; the convection section 8 is set outside the furnace body; the water mixer 9 is respectively connected with the feed water pump 10, the convection section 8 and the header box 12 The steam-water separator 11 communicates with the radiation section 6 and the header box 12 respectively, and the burner 5 communicates with the furnace body and the mixing tank 4 respectively.
所述的助燃剂配比与预热装置内的助燃剂为高温烟气与氧气的混合气；氧气浓度控制在25%-40%。The combustion enhancer ratio and the combustion enhancer in the preheating device are a mixture of high-temperature flue gas and oxygen; the oxygen concentration is controlled at 25%-40%.
所述的对流段8、汽水分离器11和集联箱12布置在炉体外侧；所述的集联箱连接有排污阀13；所述的集联箱与混水器之间饱和水管道Ⅵ上设置有止回阀14。The convection section 8, the steam-water separator 11 and the header box 12 are arranged outside the furnace body; the header box is connected with a blowdown valve 13; the saturated water pipeline VI between the header box and the water mixer A check valve 14 is provided on it.
锅炉的水流程为：经过处理的带压软化除氧水21经过给水泵10升压后，进入混水器9，后经管道Ⅳ22进入所述锅炉的对流段8，被加热为高温水，再进入辐射段6被加热成为饱和湿蒸汽，饱和湿蒸汽通过管道Ⅴ23经汽水分离器11进行汽水分离，饱和蒸汽由汽水分离器11顶部的饱和蒸汽出口24流出，通过相应管道注入地下采油；由汽水分离器11分离出的饱和水由汽水分离器11底部饱和水出口端流出，由集联箱12顶部饱和水入口端进入集联箱12，饱和水由集联箱12饱和水出口端流出，至混水器9饱和水入口端进入混水器9，与锅炉给水混合，提高锅炉给水温度；集联箱12底部排污口设置排污阀13，当无机盐类达到一定浓度时进行排污；在集联箱12与混水器9之间饱和水管道Ⅵ25上设置止回阀14，防止饱和水倒流。The water flow process of the boiler is as follows: the treated pressure-softened deoxygenated water 21 enters the water mixer 9 after being boosted by the feed water pump 10, and then enters the convection section 8 of the boiler through the pipeline IV 22, is heated to high-temperature water, and then Entering the radiant section 6, it is heated to become saturated wet steam, and the saturated wet steam is separated from steam and water through the steam-water separator 11 through the pipeline V23. The saturated water separated by the separator 11 flows out from the saturated water outlet end at the bottom of the steam-water separator 11, enters the header box 12 from the saturated water inlet port at the top of the header box 12, and the saturated water flows out from the saturated water outlet end of the header box 12, to The saturated water inlet port of the water mixer 9 enters the water mixer 9 and mixes with the boiler feed water to increase the temperature of the boiler feed water; the sewage outlet at the bottom of the header box 12 is provided with a sewage valve 13, and the sewage is discharged when the inorganic salt reaches a certain concentration; A check valve 14 is set on the saturated water pipeline VI25 between the tank 12 and the water mixer 9 to prevent the saturated water from flowing back.
锅炉的烟气流程为：烟气依次通过所述锅炉的辐射段6后，一部分高温烟气经由循环风机7增压后通过烟气循环管道19由混气罐4烟气入口端流入混气罐4；剩余部分高温烟气经由锅炉对流段8由低温烟气排出管道20排出进行烟气处理后排入大气；烟气循环量由可调式循环风机调节，根据助燃剂中氧气浓度进行调节。The flue gas flow of the boiler is as follows: After the flue gas passes through the radiant section 6 of the boiler in turn, a part of the high-temperature flue gas is pressurized by the circulating fan 7 and then flows into the gas mixing tank from the flue gas inlet port of the gas mixing tank 4 through the flue gas circulation pipe 19 4. The remaining part of the high-temperature flue gas is discharged from the low-temperature flue gas discharge pipe 20 through the convection section 8 of the boiler, and then discharged into the atmosphere after flue gas treatment; the flue gas circulation volume is adjusted by an adjustable circulating fan and adjusted according to the oxygen concentration in the combustion aid.
锅炉的助燃剂流程：外界空气通过鼓风机1增压后，由膜式富氧发生器2入口端进入膜式富氧发生器2制取纯氧，纯氧由膜式富氧发生器2出口端流入管道II16进入纯氧储罐3，与烟气循环管道19流入的高温烟气进行混合形成高温富氧助燃剂，氧气浓度在25%-40%，最后通过燃烧器5与燃料在炉体内混合燃烧。The process of the combustion aid of the boiler: After the external air is pressurized by the blower 1, it enters the membrane oxygen generator 2 from the inlet port to produce pure oxygen, and the pure oxygen is supplied from the outlet port of the membrane oxygen generator 2. The inflow pipeline II16 enters the pure oxygen storage tank 3, and is mixed with the high-temperature flue gas flowing in from the flue gas circulation pipeline 19 to form a high-temperature oxygen-enriched combustion aid with an oxygen concentration of 25%-40%, and finally mixes with fuel in the furnace through the burner 5 combustion.
本发明将烟气循环技术和富氧燃烧技术结合在一起，形成高温富氧燃烧，纯氧由膜式富氧发生器产生，利用高温烟气与纯氧直接混合成高于常规空气中氧气浓度（>21%）的高温富氧助燃剂后送入燃烧器，与燃料进行混合燃烧，实现高温富氧燃烧。该技术可实现对注汽锅炉内的连续供应高温富氧助燃剂，保证了炉内火焰的稳定性，烟气多次循环后形成富含CO2的高温烟气，解决了高温富氧燃烧技术带来的高NOx排放浓度问题。同时，混水器实现由汽水分离器分离出的饱和水与锅炉给水的直接混合，提高锅炉给水的温度。The invention combines flue gas circulation technology and oxygen-enriched combustion technology to form high-temperature oxygen-enriched combustion. (>21%) high-temperature oxygen-enriched combustion aid is sent to the burner, and mixed with fuel for combustion to achieve high-temperature oxygen-enriched combustion. This technology can realize the continuous supply of high-temperature oxygen-enriched combustion accelerant to the steam injection boiler, which ensures the stability of the flame in the furnace. The high-temperature flue gas rich in CO2 is formed after the flue gas circulates for many times, which solves the problem of high-temperature oxygen-enriched combustion technology. The problem of high NOx emission concentration brought about. At the same time, the water mixer realizes the direct mixing of the saturated water separated by the steam-water separator and the boiler feed water to increase the temperature of the boiler feed water.
本发明以截面为正方形，边长为230 mm，高1000 mm的立式炉膛为实验炉，燃料为天然气进行研究表明：在常规烟气循环过程中，炉内流通烟气中的CO2和水蒸气份额增加，N2份额降低；在初始循环为纯CO2时，炉内CO2份额降低，水蒸气和N2份额增加；烟气循环10次以上时，两者烟气中各种组分份额趋于一稳定值，且两者相同组分的份额基本相等，只有氮气含量存在偏差；这也导致两者在NOx浓度上的差别。以氧气浓度25%时为例，采用两种烟气循环后，前者NOx浓度比后者少降低10%左右。由此可知，无论采用哪种循环方式，烟气均将成为富含CO2的高温烟气，最终将大幅降低NOx排放浓度。因此可运用烟气循环技术解决富氧燃烧带来的高NOx排放问题。In the present invention, a vertical furnace with a square section, a side length of 230 mm, and a height of 1000 mm is used as an experimental furnace, and the fuel is natural gas for research. The proportion of steam increases and the proportion of N2 decreases; when the initial cycle is pure CO2 , the proportion of CO2 in the furnace decreases, and the proportion of water vapor and N2 increases; The share tends to a stable value, and the shares of the same components of the two are basically equal, only the nitrogen content has a deviation; this also leads to the difference in the NOx concentration between the two. Taking the oxygen concentration of 25% as an example, after using two kinds of flue gas circulation, the NOx concentration of the former is about 10% lower than that of the latter. It can be seen that no matter which circulation method is adopted, the flue gas will become a high-temperature flue gas rich in CO 2 , which will eventually greatly reduce the NOx emission concentration. Therefore, flue gas circulation technology can be used to solve the problem of high NOx emission caused by oxygen-enriched combustion.
以上所述是本发明的具体实施例及所运用的技术原理，任何基于本发明技术方案基础上的等效变换，均属于本发明的保护范围之内。The above are specific embodiments of the present invention and the applied technical principles. Any equivalent transformation based on the technical solution of the present invention falls within the scope of protection of the present invention.
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Application publication date: 20170524 |