CN108939916A - A kind of system carrying out SCR efficient denitration using ozone - Google Patents
A kind of system carrying out SCR efficient denitration using ozone Download PDFInfo
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- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract description 71
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 55
- 238000002347 injection Methods 0.000 claims abstract description 43
- 239000007924 injection Substances 0.000 claims abstract description 43
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 26
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000003546 flue gas Substances 0.000 claims abstract description 21
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 14
- 230000003647 oxidation Effects 0.000 claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims abstract description 11
- 239000012286 potassium permanganate Substances 0.000 claims abstract description 9
- 238000012856 packing Methods 0.000 claims abstract description 8
- 230000003068 static effect Effects 0.000 claims description 19
- 239000003054 catalyst Substances 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 6
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 239000011572 manganese Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000003245 coal Substances 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 2
- 229910052760 oxygen Inorganic materials 0.000 claims 2
- 239000001301 oxygen Substances 0.000 claims 2
- 239000000523 sample Substances 0.000 abstract description 4
- 238000012806 monitoring device Methods 0.000 abstract description 3
- 239000000945 filler Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000006385 ozonation reaction Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
- B01D53/82—Solid phase processes with stationary reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8696—Controlling the catalytic process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/104—Ozone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
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Abstract
本发明公开一种利用臭氧进行SCR高效脱硝的系统，包括省煤器、高锰酸钾填料层、在线监测装置、臭氧氧化混合系统、扰流装置、喷氨混合系统、导流叶片、气体整流器、SCR反应器和空气预热器。其结构特点在于：在线监测探头和省煤器之间布置有高锰酸钾填料层，对烟气进行预氧化，使脱硝更加彻底；在线监测装置的探头布置在臭氧氧化系统和省煤器之间，根据NOX的监测量用于精确控制臭氧和氨气喷射量；SCR脱硝系统与臭氧氧化系统有机整合。本发明提供的脱硝系统，工作温度低，材料利用率高，脱硝效率更高，有效的避免了烟气对环境的污染，契合国家节能减排的需要，应用前景广泛。
The invention discloses a system for utilizing ozone to carry out SCR high-efficiency denitrification, including an economizer, a potassium permanganate filler layer, an online monitoring device, an ozone oxidation mixing system, a turbulence device, an ammonia injection mixing system, guide vanes, and a gas rectifier , SCR reactor and air preheater. Its structural features are: a potassium permanganate packing layer is arranged between the online monitoring probe and the economizer to pre-oxidize the flue gas to make the denitrification more thorough; the probe of the online monitoring device is arranged between the ozone oxidation system and the economizer During the period, the monitoring amount of NO X is used to precisely control the amount of ozone and ammonia injection; the SCR denitrification system is organically integrated with the ozone oxidation system. The denitrification system provided by the invention has low working temperature, high material utilization rate, higher denitrification efficiency, effectively avoids the pollution of flue gas to the environment, meets the needs of the country for energy saving and emission reduction, and has broad application prospects.
Description
技术领域technical field
本发明属于烟气净化技术及能源节越领域，具体涉及一种利用臭氧进行SCR高效脱硝的系统。The invention belongs to the fields of flue gas purification technology and energy saving, and in particular relates to a system for performing SCR high-efficiency denitrification by using ozone.
背景技术Background technique
目前，国内外电厂应用最广泛的烟气脱硝技术是选择性催化还原(SCR)工艺。其主要原理是：在催化剂的作用下，使还原剂(一般用氨气与空气混合气体)与锅炉尾部烟气中的氮氧化物充分混合并反应，生成氮气和水，达到脱硝目的。但是传统的SCR依然存在催化剂用量大、脱硝效率难于提高等问题，近年来，臭氧独特的强氧化性将NO氧化为易于脱除的NO2，且副产物为无毒无害的O2，使得臭氧脱硝的方式备受关注。由于烟气中NOx的主要组成是NO（占95%），NO难溶于水，将传统的SCR脱硝技术与臭氧脱硝有机整合，通过控制臭氧喷射量，使得NO和NO2的摩尔比在1左右，此时，传统的SCR脱硝反应4 NH 3 + 4 NO + O2→ 4 N2+ 6 H2O 会转化为反应要求温度更低，且反应速率提高一个数量级的快速SCR反应（FAST-SCR）4 NH3 + 2 NO + 2 NO2→ 4 N2 + 6 H2O，从而可以大大提高脱硝效率和资源利用率，是一个重要的研究方向。At present, the most widely used flue gas denitrification technology in domestic and foreign power plants is the Selective Catalytic Reduction (SCR) process. The main principle is: under the action of a catalyst, the reducing agent (generally ammonia and air mixed gas) is fully mixed and reacted with the nitrogen oxides in the flue gas at the tail of the boiler to generate nitrogen and water to achieve the purpose of denitrification. However, the traditional SCR still has problems such as a large amount of catalyst used and difficulty in improving the denitrification efficiency. In recent years, the unique strong oxidizing property of ozone oxidizes NO into NO 2 which is easy to remove, and the by-product is non-toxic and harmless O 2 , making The way of ozone denitrification has attracted much attention. Since the main composition of NOx in flue gas is NO (accounting for 95%), and NO is difficult to dissolve in water, the traditional SCR denitrification technology is organically integrated with ozone denitrification, and the molar ratio of NO and NO 2 is kept at 1 by controlling the amount of ozone injection. At this time, the traditional SCR denitrification reaction 4 NH 3 + 4 NO + O 2 → 4 N 2 + 6 H 2 O will be transformed into a fast SCR reaction (FAST- SCR) 4 NH 3 + 2 NO + 2 NO 2 → 4 N 2 + 6 H 2 O, which can greatly improve the denitrification efficiency and resource utilization, is an important research direction.
目前，对于结合SCR脱硝技术与臭氧脱硝的研究依然存在欠缺，如中国专利201520758021.X报道的一种改进型SCR臭氧脱硝装置是将臭氧喷射混合装置布置在SCR脱硝装置之后，最终NOX的脱除还是依靠后续脱硫装置，所以没有能够将两种方式进行有机结合，只是简单的叠加；中国专利201620922445.X虽然提出将SCR脱硝技术与臭氧脱硝有机结合的“FAST SCR”反应，但其未考虑臭氧在250℃及以上的高温下会立即分解，不能达到氧化NO的效果，而且监测装置的位置不利于控制臭氧喷射量，会浪费臭氧资源。At present, there is still a lack of research on the combination of SCR denitrification technology and ozone denitrification. For example, an improved SCR ozone denitrification device reported in Chinese patent 201520758021 . In addition to relying on the follow-up desulfurization device, there is no organic combination of the two methods, but simple superposition; although Chinese patent 201620922445. Ozone will decompose immediately at a high temperature of 250°C and above, which cannot achieve the effect of oxidizing NO, and the position of the monitoring device is not conducive to controlling the amount of ozone injection, which will waste ozone resources.
发明内容Contents of the invention
为了解决上述技术问题，本发明提供一种利用臭氧进行SCR高效脱硝的系统。In order to solve the above technical problems, the present invention provides a system for performing SCR efficient denitrification using ozone.
本发明是通过以下技术方案实现的。The present invention is achieved through the following technical solutions.
一种利用臭氧进行SCR高效脱硝的系统，其特征在于，包括安装在锅炉烟气出口处的省煤器，所述省煤器的下方布置有高锰酸钾填料层，所述高锰酸钾填料层下方安装有在线检测装置，所述在线检测装置下方安装有臭氧氧化混合系统，所述臭氧氧化混合系统包括臭氧发生器、臭氧喷射装置和静态混合器，所述臭氧发生器产生的臭氧经过臭氧喷射装置喷射进入静态混合器中，所述臭氧喷射装置根据NOX的监测结果控制臭氧喷射量并随烟气一同进入静态混合器充分混合反应，所述臭氧氧化混合系统后安装有扰流装置，所述的扰流装置后设置有喷氨混合系统，所述喷氨混合系统包括氨气喷射装置和静态混合器，所述氨气喷射装置根据NOX的监测结果控制氨气喷射量并随烟气一同进入后方的静态混合器，所述喷氨混合系统后依次设置有导流叶片和气体整流器，所述的气体整流器的下方布置有SCR反应器，所述的SCR反应器内置格栅型催化剂载体，所述SCR反应器后设置有空气预热器。A system for utilizing ozone to carry out SCR high-efficiency denitrification, characterized in that it includes an economizer installed at the boiler flue gas outlet, a potassium permanganate packing layer is arranged below the economizer, and the potassium permanganate An on-line detection device is installed below the packing layer, and an ozonation oxidation mixing system is installed below the on-line detection device. The ozonation oxidation mixing system includes an ozone generator, an ozone injection device and a static mixer, and the ozone produced by the ozonizer passes through The ozone injection device injects into the static mixer. The ozone injection device controls the amount of ozone injection according to the monitoring results of NO X and enters the static mixer together with the flue gas to fully mix and react. A turbulence device is installed after the ozone oxidation mixing system , the ammonia injection mixing system is arranged after the turbulence device, and the ammonia injection mixing system includes an ammonia injection device and a static mixer, and the ammonia injection device controls the ammonia injection amount according to the monitoring results of NO x and follows The flue gas enters the static mixer at the rear together. The ammonia injection mixing system is followed by guide vanes and gas rectifiers in sequence. An SCR reactor is arranged below the gas rectifier. The SCR reactor has a built-in grid type A catalyst carrier, an air preheater is arranged behind the SCR reactor.
优选地，所述的化学反应主要是指如下三个反应：Preferably, the chemical reaction mainly refers to the following three reactions:
O3 + NO→ NO2 + O2 (1)O 3 + NO → NO 2 + O 2 (1)
4 NH 3 + 4 NO + O2→ 4 N2 + 6 H2O (2)4 NH 3 + 4 NO + O 2 → 4 N 2 + 6 H 2 O (2)
4 NH3 + 2 NO + 2 NO2→ 4 N2 + 6 H2O (3)4 NH 3 + 2 NO + 2 NO 2 → 4 N 2 + 6 H 2 O (3)
优选地，所述省煤器的烟气出口温度控制在100~250℃。Preferably, the flue gas outlet temperature of the economizer is controlled at 100-250°C.
优选地，所述臭氧的喷射量与监测到的NO含量的摩尔比控制在0.5~1.0。Preferably, the molar ratio of the ozone injection amount to the monitored NO content is controlled at 0.5-1.0.
优选地，所述氨气的喷射量与监测到的NOX含量的摩尔比控制在1.0~1.5。Preferably, the molar ratio of the injection amount of the ammonia gas to the monitored NOx content is controlled at 1.0-1.5.
优选地，所述臭氧和氨气的喷射装置采用多角度喷嘴设计。Preferably, the ozone and ammonia injection device adopts a multi-angle nozzle design.
更详细地，所述SCR反应器选用低温催化剂，优选为锰基低温催化剂和碳基低温催化剂。。More specifically, the SCR reactor uses low-temperature catalysts, preferably manganese-based low-temperature catalysts and carbon-based low-temperature catalysts. .
更详细地，上述静态混合器包括管壳、连接法兰、左旋单元片、右旋单元片。In more detail, the above-mentioned static mixer includes a tube shell, a connecting flange, a left-handed unit piece, and a right-handed unit piece.
更详细地，所述气体整流器为不锈钢多孔整流器。In more detail, the gas rectifier is a stainless steel porous rectifier.
由以上的技术方案可知，本发明的有益效果是：As can be seen from the above technical scheme, the beneficial effects of the present invention are:
本发明提供的一种利用臭氧进行SCR高效脱硝的系统，严格控制省煤器出口温度，保证臭氧氧化反应的最佳反应温度，加快反应速率；在线监测探头和省煤器之间布置有高锰酸钾填料层，对烟气进行预氧化，使脱硝更加彻底；在线监测探头布置在臭氧氧化系统和省煤器之间，根据NOX的监测量用于精确控制臭氧和氨气喷射量，提高资源利用率；臭氧氧化混合系统之后安装有扰流装置，有利于混合气体；SCR脱硝系统与臭氧氧化系统有机整合，选用低温催化剂体系，且在催化剂格栅之前布置导流片和气流整合器，进一步加快整个脱硝流程并使得烟气与催化剂接触更均匀，从而提高脱硝效率。The present invention provides an efficient SCR denitrification system using ozone, which strictly controls the outlet temperature of the economizer to ensure the optimal reaction temperature of the ozone oxidation reaction and speed up the reaction rate; high manganese is arranged between the online monitoring probe and the economizer Potassium acid filler layer pre-oxidizes the flue gas to make the denitrification more thorough; the online monitoring probe is arranged between the ozonation system and the economizer, and is used to accurately control the amount of ozone and ammonia injection according to the monitoring amount of NO X to improve Resource utilization; a spoiler device is installed after the ozone oxidation hybrid system, which is beneficial to the mixed gas; the SCR denitrification system is organically integrated with the ozone oxidation system, and a low-temperature catalyst system is selected, and a deflector and an air flow integrator are arranged before the catalyst grid. Further speed up the whole denitrification process and make the contact between flue gas and catalyst more uniform, thereby improving the denitrification efficiency.
附图说明Description of drawings
构成本申请的一部分的附图用来提供对本发明的进一步理解，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中The accompanying drawings constituting a part of this application are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. in the attached picture
图1为本发明一种利用臭氧进行SCR高效脱硝的系统的结构示意图。FIG. 1 is a schematic structural diagram of a system for utilizing ozone to perform SCR high-efficiency denitrification in the present invention.
图中：1、省煤器，2、高锰酸钾填料层，3、在线检测装置，4、臭氧喷射装置，5、臭氧发生器，6、9 静态混合器，7、扰流装置，8、氨气喷射装置，10、导流叶片，11、气体整流器，12、SCR反应器，13、空气预热器。In the figure: 1. Economizer, 2. Potassium permanganate packing layer, 3. On-line detection device, 4. Ozone injection device, 5. Ozone generator, 6. 9 Static mixer, 7. Disturbance device, 8 . Ammonia injection device, 10. Guide vane, 11. Gas rectifier, 12. SCR reactor, 13. Air preheater.
图2为本发明一种利用臭氧进行SCR高效脱硝的系统的静态混合器6、9的剖面示意图。Fig. 2 is a schematic cross-sectional view of the static mixers 6 and 9 of a system for utilizing ozone to perform SCR high-efficiency denitrification according to the present invention.
图中：61、连接法兰，62、管壳，63、左旋单元片，64、右旋单元片。In the figure: 61, connecting flange, 62, pipe shell, 63, left-handed unit piece, 64, right-handed unit piece.
图3为本发明一种利用臭氧进行SCR高效脱硝的系统的臭氧和氨气喷射装置喷嘴的剖面示意图。Fig. 3 is a schematic cross-sectional view of the nozzle of the ozone and ammonia injection device of a system for utilizing ozone to perform SCR high-efficiency denitrification according to the present invention.
图4为本发明一种利用臭氧进行SCR高效脱硝的系统的扰流装置7的内部结构示意图。FIG. 4 is a schematic diagram of the internal structure of a flow turbulence device 7 of a system for utilizing ozone to perform SCR high-efficiency denitrification according to the present invention.
具体实施方式Detailed ways
下面将结合附图对本发明的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them.
基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
在本发明的描述中，需要说明的是，术语“上”、“下”、“左”、“右”、“竖直”、“水平”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as limiting the invention.
在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“布置”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本发明中的具体含义。In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "arrangement", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, or It can be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.
实施例1Example 1
参见图1，一种利用臭氧进行SCR高效脱硝的系统，包括省煤器1，所述省煤器1用于降低从锅炉出来的烟气温度，以保证臭氧氧化反应的高效率进行，在省煤器1的下方布置有高锰酸钾填料层2，所述高锰酸钾填料层2下方安装有在线检测装置3，所述在线检测装置3下方安装有臭氧氧化混合系统，所述臭氧氧化混合系统包括臭氧喷射装置4、臭氧发生器5和静态混合器6，所述臭氧发生器5产生的臭氧经过臭氧喷射装置4喷射进入静态混合器6中，所述臭氧喷射装置4根据NOX的监测结果控制臭氧喷射量并随烟气一同进入静态混合器6充分混合反应，所述臭氧氧化混合系统后安装有扰流装置7，所述的扰流装置7后设置有喷氨混合系统，所述喷氨混合系统包括氨气喷射装置8和静态混合器9，所述氨气喷射装置8根据NOX的监测结果控制氨气喷射量并随烟气一同进入后方的静态混合器9，随后混合气体依次通过导流叶片10和气体整流器11保证沿烟气管道径向直线流动，所述的气体整流器11的下方布置有SCR反应器12，所述的SCR反应器12 内置格栅型催化剂载体并采用低温催化剂，脱硝之后的混合气体进入空气预热器13。Referring to Fig. 1, a system for utilizing ozone to carry out SCR high-efficiency denitrification includes an economizer 1, which is used to reduce the temperature of the flue gas from the boiler to ensure the high efficiency of the ozone oxidation reaction. A potassium permanganate packing layer 2 is arranged below the coal burner 1, an online detection device 3 is installed below the potassium permanganate packing layer 2, an ozone oxidation mixing system is installed below the online detection device 3, and the ozone oxidation The mixing system includes an ozone injection device 4, an ozone generator 5 and a static mixer 6. The ozone generated by the ozone generator 5 is injected into the static mixer 6 through the ozone injection device 4, and the ozone injection device 4 is based on the NO x The monitoring results control the amount of ozone injection and enter the static mixer 6 with the flue gas to fully mix and react. After the ozone oxidation mixing system, a turbulence device 7 is installed, and after the turbulence device 7, an ammonia injection mixing system is arranged. The ammonia injection mixing system includes an ammonia injection device 8 and a static mixer 9. The ammonia injection device 8 controls the ammonia injection amount according to the monitoring results of NO x and enters the rear static mixer 9 together with the flue gas, and then mixes The gas passes through the guide vanes 10 and the gas rectifier 11 in sequence to ensure a straight flow along the radial direction of the flue gas pipe. An SCR reactor 12 is arranged below the gas rectifier 11. The SCR reactor 12 has a built-in grid-type catalyst carrier and A low-temperature catalyst is used, and the denitrated mixed gas enters the air preheater 13 .
本发明中，所述的化学反应主要是指下三个反应：Among the present invention, described chemical reaction mainly refers to following three reactions:
O3 + NO→ NO2 + O2 (1)O 3 + NO → NO 2 + O 2 (1)
4 NH 3 + 4 NO + O2→ 4 N2 + 6 H2O (2)4 NH 3 + 4 NO + O 2 → 4 N 2 + 6 H 2 O (2)
4 NH3 + 2 NO + 2 NO2→ 4 N2 + 6 H2O (3)4 NH 3 + 2 NO + 2 NO 2 → 4 N 2 + 6 H 2 O (3)
本发明中，上述省煤器的烟气出口温度控制在150℃。In the present invention, the flue gas outlet temperature of the economizer is controlled at 150°C.
本发明中，上述臭氧的喷射量与监测到的NO含量的摩尔比控制在0.7。In the present invention, the molar ratio between the amount of ozone injected and the monitored NO content is controlled at 0.7.
本发明中，上述氨气的喷射量与监测到的NOX含量的摩尔比控制在1.3。In the present invention, the molar ratio of the injection amount of ammonia gas to the monitored NOx content is controlled at 1.3.
本发明中，上述臭氧喷射装置4和氨气喷射装置8采用多角度喷嘴设计。In the present invention, the above-mentioned ozone injection device 4 and ammonia gas injection device 8 are designed with multi-angle nozzles.
本发明中，上述SCR反应器的低温催化剂为锰基低温催化剂。In the present invention, the low-temperature catalyst of the above-mentioned SCR reactor is a manganese-based low-temperature catalyst.
本发明中，上述静态混合器6包括管壳62、连接法兰61、左旋单元片63、右旋单元片64。In the present invention, the static mixer 6 includes a shell 62 , a connecting flange 61 , a left-handed unit piece 63 , and a right-handed unit piece 64 .
本发明中，上述气体整流器10为不锈钢多孔整流器。In the present invention, the gas rectifier 10 is a stainless steel porous rectifier.
需要说明的是，以上实施例仅用以说明本发明的技术方案而非限制。尽管参照较佳实施例对本发明进行了详细说明，本领域的普通技术人员应当理解，可以对发明的技术方案进行修改或者等同替换，而不脱离本发明技术方案的范围，其均应涵盖在本发明的权利要求范围中。It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and not to limit. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solution of the invention can be modified or equivalently replaced without departing from the scope of the technical solution of the present invention, which should be covered in this within the scope of the claimed invention.
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Application publication date: 20181207 |