CN110624383B - Online regeneration catalytic denitration and dioxin removal reaction device - Google Patents
Online regeneration catalytic denitration and dioxin removal reaction device Download PDFInfo
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Abstract
本发明提供了一种在线式再生催化脱硝及去除二噁英反应装置，包括SCR反应机构、烟气再生机构和脱硫机构。所述SCR反应机构包括若干个SCR反应器、氨喷射组件和氨‑烟气静态混合器，所述氨‑烟气静态混合器的进口端分别与所述氨喷射组件和所述烟气进气管道连接，出口管道分别对应与各SCR反应器的进口连接，所述烟气再生机构的进口端与所述烟气排气管道连接，出口端分别对应与各SCR反应器的进口连接。本发明提供的在线式再生催化脱硝及去除二噁英反应装置，除了在不先升温脱硫的前提下，采用一体式催化脱硝及去除二噁英催化剂，使烟气达标排放，当高含硫的烟气将催化剂中毒失效的情况下，能实现在线再生。
The present invention provides an online regenerative catalytic denitrification and dioxin removal reaction device, including an SCR reaction mechanism, a flue gas regeneration mechanism and a desulfurization mechanism. The SCR reaction mechanism includes a plurality of SCR reactors, an ammonia injection assembly and an ammonia flue gas static mixer, the inlet end of the ammonia flue gas static mixer is respectively connected to the ammonia injection assembly and the flue gas intake pipe, and the outlet pipes are respectively connected to the inlet of each SCR reactor, the inlet end of the flue gas regeneration mechanism is connected to the flue gas exhaust pipe, and the outlet end is respectively connected to the inlet of each SCR reactor. The online regenerative catalytic denitrification and dioxin removal reaction device provided by the present invention, in addition to using an integrated catalytic denitrification and dioxin removal catalyst to make the flue gas meet the emission standards without first heating up the desulfurization, can achieve online regeneration when the catalyst is poisoned and ineffective by the high-sulfur flue gas.
Description
Technical field:
the invention relates to the technical field of denitration reaction, in particular to an online regeneration catalytic denitration and dioxin removal reaction device.
The background technology is as follows:
In the subsequent flue gas treatment system of the incineration device in various dangerous waste and chemical fields in China, the same dilemma is faced, namely, because the dangerous waste involved in incineration is complex in variety and high in sulfur and nitrogen content, a large amount of nitrogen oxides and sulfur dioxide can be generated in the incineration process, and denitration is needed to realize standard emission of flue gas, but in order to ensure that the catalyst for catalytic denitration reaches the optimal efficiency, the traditional process is to remove sulfur dioxide in the flue gas to be less than 50mg/NM3, and then heat the desulfurized flue gas to about 180-200 ℃ in a heating mode for catalytic denitration, and the traditional process can reach standard emission of the flue gas, but is uneconomical in operation and high in production cost.
The invention comprises the following steps:
the invention aims at overcoming the defects of the prior art and provides an online regeneration catalytic denitration and dioxin removal reaction device which can solve the problems.
The technical scheme for achieving the purpose of the invention is that the on-line regeneration catalytic denitration and dioxin removal reaction device comprises an SCR reaction mechanism, a flue gas regeneration mechanism and a desulfurization mechanism.
The SCR reaction mechanism comprises a plurality of SCR reactors, an ammonia injection assembly and an ammonia-flue gas static mixer, wherein the inlet end of the ammonia-flue gas static mixer is respectively connected with the ammonia injection assembly and the flue gas inlet pipeline, the outlet pipeline of the ammonia-flue gas static mixer comprises a plurality of first split pipelines, each first split pipeline is respectively and correspondingly connected with the inlet of each SCR reactor, a first control valve is arranged on each first split pipeline, the outlet pipeline of each SCR reactor is respectively connected with the flue gas exhaust pipeline, and a composite functional catalyst layer is arranged in each SCR reactor.
The inlet end of the flue gas regeneration mechanism is connected with the flue gas exhaust pipeline, the outlet end of the flue gas regeneration mechanism comprises a plurality of second shunt pipelines, each second shunt pipeline is correspondingly connected with the inlet of each SCR reactor respectively, each second shunt pipeline is provided with an electric regulating valve respectively, and the flue gas regeneration mechanism is internally provided with a flue gas heating mechanism.
The inlet of the desulfurization mechanism is connected with the flue gas exhaust pipeline, and the flue gas exhaust pipeline is provided with an induced draft fan.
Further, the ammonia injection assembly comprises an ammonia tank, an ammonia mixer, a dilution fan and an ammonia injection grid, wherein an inlet of the ammonia mixer is connected with the ammonia tank and the dilution fan, an outlet of the ammonia mixer is connected with the ammonia injection grid, and the ammonia injection grid is connected with an inlet of the ammonia-flue gas static mixer.
Further, in order to facilitate the ash removal to the catalyst layer, the reaction device further comprises an ash blowing mechanism, wherein the ash blowing mechanism comprises a compressed air source and an ash blowing end, the ash blowing end is connected with the compressed air source through a pipeline and correspondingly arranged above the composite functional catalyst layer, and the ash blowing end is a rake type online movable ash blowing device provided with a plurality of ash blowing openings.
Further, the number of SCR reactors is 3.
Further, a second control valve is arranged on the outlet pipeline of each SCR reaction.
Further, in order to relieve the environmental pressure and strengthen the catalytic effect of the catalyst, a bag-type dust remover is arranged between the flue gas inlet pipeline and the ammonia-flue gas static mixer, the inlet of the bag-type dust remover is connected with the flue gas inlet pipeline, and the outlet of the bag-type dust remover is connected with the inlet end of the ammonia-flue gas static mixer.
The online regeneration catalytic denitration and dioxin removal reaction device has the beneficial effects that:
(1) The invention provides an online regeneration catalytic denitration and dioxin removal reaction device, which is characterized in that an SCR reaction mechanism, a flue gas regeneration mechanism and a desulfurization mechanism are mutually matched, an integrated low-temperature catalytic denitration and dioxin removal catalyst is adopted on the premise of not heating and desulfurizing first, so that denitration is realized, dioxin can be removed to enable flue gas to reach the emission standard, and online regeneration can be realized under the condition that high-sulfur-content flue gas poisons and fails the catalyst.
(2) And the hot flue gas regeneration air inlet of each SCR reactor is provided with an electric regulating valve, the regeneration can be automatically switched according to the control degree of the PLC, part of a small amount of hot flue gas is extracted from the system, the hot flue gas is heated to 350 ℃ by a heating mechanism in a flue gas regeneration mechanism and then is sent into a failed SCR reactor for regeneration, after the flue gas regeneration of the failed SCR reactor is finished, the flue gas is automatically switched to another failed SCR reactor, a first control valve on a first split flow pipeline of the other failed SCR reactor is closed, the hot flue gas at 350 ℃ enters the failed reactor for regeneration, and meanwhile, the flue gas of the just regenerated SCR reactor is opened for denitration and dioxin removal, so that a plurality of towers are cycled for reaction, one SCR reactor is always regenerated, and the other SCR reactors are operated without influencing the denitration and dioxin removal efficiency of the flue gas, so that the flue gas emission reaches the standard.
Description of the drawings:
fig. 1 is a schematic structural view of the present invention.
In the figure, the device comprises a 1SCR reaction mechanism, a 11SCR reactor, a 111 composite functional catalyst layer, a 12 outlet pipeline, a 121 second control valve, a 13 first diversion pipeline, a 131 first control valve, a 14 flue gas inlet pipeline, a 15 bag-type dust collector, a 16 ammonia-flue gas static mixer, a 17 induced draft fan, a 18 ammonia injection component, a 181 dilution fan, a 182 ammonia tank, a 183 ammonia mixer, a 184 ammonia injection grid, a 19 flue gas exhaust pipeline, a 2 flue gas regeneration mechanism, a 21 second diversion pipeline, a 22 electric regulating valve, a 3 desulfurization mechanism, a4 soot blowing mechanism, a 41 compressed air source, a 42 soot blowing port and a 43 soot blowing end.
The specific embodiment is as follows:
The preferred embodiments of the present invention will be described in detail below with reference to the attached drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.
Referring to fig. 1, an online regeneration catalytic denitration and dioxin removal reaction device comprises an SCR reaction mechanism 1, a flue gas regeneration mechanism 2 and a desulfurization mechanism 3.
The SCR reaction mechanism 1 comprises a plurality of SCR reactors 11, an ammonia injection assembly 18 and an ammonia-flue gas static mixer 16, the inlet end of the ammonia-flue gas static mixer 16 is respectively connected with the ammonia injection assembly 18 and the flue gas inlet pipe 14, the outlet pipe of the ammonia-flue gas static mixer 16 comprises a plurality of first diversion pipes 13, each first diversion pipe 13 is respectively connected with the inlet of each SCR reactor 11 correspondingly, each first diversion pipe 13 is provided with a first control valve 131, the outlet pipe 12 of each SCR reactor 11 is respectively connected with the flue gas exhaust pipe 19, a second control valve 121 is arranged on the outlet pipe 12 of each SCR reactor 11 for conveniently controlling the exhaust condition, and a composite functional catalyst layer 111 is arranged in each SCR reactor 11.
Furthermore, the number of SCR reactors 11 may be set according to circumstances, preferably 3. The SCR reactor 11 is a structure containing a catalyst, and is mainly formed by welding a steel structure frame, a steel plate, or the like to form a closed space. In order to prevent the heat dissipation of the flue gas, a heat insulating material and a steam heating companion tube can be arranged between the inner guard plate and the outer guard plate of the SCR reactor 11.
Because the flue gas with high nitrogen oxides contains high sulfur dioxide gas, the sulfur dioxide gas can react with ammonia in the reactor to generate ammonium bisulfate, so in order to prevent the generated Ammonium Bisulfate (ABS) from being deposited on the surface of the composite functional catalyst (ABS is 147 ℃ in melting point and is decomposed at a temperature of more than 280 ℃, the ABS is particularly sticky at low temperature, and can be gathered together with smoke dust in the flue gas to be deposited on the surface of the composite functional catalyst, so that small holes on the surface of the catalyst are blocked, the activity of the catalyst is affected, and the system overpressure cannot normally run), the flue gas regeneration mechanism 2 is required to be arranged in the SCR reactor 11. When the nitrogen-oxygen concentration of the flue gas exhaust pipeline 19 is ultrahigh, the flue gas regeneration mechanism 2 is started to regenerate hot flue gas of the SCR reactor 11 which is invalid due to ABS, and the regeneration source of the SCR reactor 11 adopts clean flue gas which is 180-200 ℃ and subjected to primary denitration and dioxin.
The inlet end of the flue gas regeneration mechanism 2 is connected with the flue gas exhaust pipeline 19, the outlet end comprises a plurality of second shunt pipelines 21, each second shunt pipeline 21 is correspondingly connected with the inlet of each SCR reactor 11, each second shunt pipeline 21 is provided with an electric regulating valve 22, and the flue gas regeneration mechanism 2 is internally provided with a flue gas heating mechanism (not shown in the figure).
The regeneration air inlet of each SCR reactor 11 is provided with an electric regulating valve 22, regeneration can be automatically switched according to the control degree of the PLC, the regenerated hot flue gas adopts 180-200 ℃ hot flue gas of a reaction system as a regeneration source, part of the hot flue gas is extracted from the system and is heated to 350 ℃ in a regeneration mechanism 2 and then is sent into the failed SCR reactor 11 for catalyst regeneration, when the regeneration of the failed SCR reactor 11 is finished, the regeneration air inlet of the failed SCR reactor 11 is automatically switched to another failed SCR reactor 11, a control valve 131 on a main flue gas pipeline of the other failed SCR reactor 11, namely a first diversion pipeline 13, is closed, the hot flue gas at 350 ℃ enters the SCR reactor 11 for regeneration, and meanwhile, a flue gas inlet valve 131 of the just regenerated SCR reactor 11 is opened for denitration to remove dioxin, so that a plurality of SCR reactors 11 are in circulation reaction work, one SCR reactor is always regenerated in a plurality of SCR reactors, other SCR reactors are all operated, and simultaneously, the whole regeneration process can be automatically operated according to incineration working conditions and actual working conditions.
The inlet of the desulfurization mechanism 3 is connected with the flue gas exhaust pipeline 19, and the flue gas exhaust pipeline 19 is provided with an induced draft fan 17.
In addition, the ammonia injection assembly 18 of the present application comprises an ammonia tank 182, an ammonia mixer 183, a dilution blower 181 and an ammonia injection grid 184, wherein the inlet of the ammonia mixer 183 is connected with the ammonia tank 182 and the dilution blower 181, the outlet end is connected with the ammonia injection grid 184, and the ammonia injection grid 184 is connected with the inlet end of the ammonia-flue gas static mixer 16. The ammonia gas is diluted by air, then is mixed with the flue gas in an ammonia-flue gas static mixer 16, and enters the SCR reactor 11 after being uniformly mixed.
In addition, the safety of the ammonia injection system is fully considered, and the upper and lower explosion limits of ammonia are 16-25%, so that ammonia can be diluted to 1/4 of the lower explosion concentration limit before being injected into the SCR denitration and dioxin removal reaction tower, and simultaneously, the injection amount of the ammonia is strictly controlled by the system in the whole denitration process, so that the ammonia is not excessively taken in while the complete conversion of nitrogen oxides is ensured, and secondary pollution to the environment is avoided. The spraying amount of ammonia gas adopts a pneumatic flow regulating valve to be interlocked with an ammonia flow meter, the measurement of the ammonia flow meter is interlocked with an ammonia gas online analyzer at the outlet of the SCR reaction tower, and the ammonia gas online analyzer at the outlet of the SCR reactor 11 is interlocked with the ammonia gas online analyzer, so that the outlet concentration of the outlet ammonia is strictly controlled, the outlet concentration is controlled to be less than or equal to 3PPm, and the ammonia is ensured not to be excessive.
In addition, in order to conveniently carry out the deashing to the catalyst layer, reaction unit still includes soot blowing mechanism 4, soot blowing mechanism 4 includes compressed air source 41 and soot blowing end 43, soot blowing end 43 with compressed air source 41 passes through the pipeline connection, soot blowing end 43 is the online portable soot blowing device of harrow formula, and it corresponds to establish the top of composite function catalyst layer 111, be equipped with a plurality of soot blowing mouth 42 on the soot blowing end 43. Meanwhile, the injected compressed air can be heated to about 150-160 ℃ by a flue gas heater (not shown in the figure) in the SCR system and then blown into the composite functional catalyst layer 111 for ash removal, so that the temperature drop in the SCR reactor 11 caused by the injection of the injected compressed air is avoided. Meanwhile, a differential pressure transmitter can be installed on each layer of composite functional catalyst layer 111, and the soot blowing control system is controlled in a mode of combining differential pressure and time and can be flexibly controlled.
In addition, in order to relieve the environmental pressure and enhance the catalytic effect of the catalyst, a bag-type dust remover 15 is arranged between the flue gas inlet pipeline 14 and the ammonia-flue gas static mixer 16, the bag-type dust remover 15 can remove most dust in flue gas firstly, the inlet of the bag-type dust remover 15 is connected with the flue gas inlet pipeline 14, and the outlet of the bag-type dust remover 15 is connected with the inlet end of the ammonia-flue gas static mixer 16.
When the flue gas desulfurization device works, flue gas enters a bag-type dust remover 15 from a flue gas inlet pipeline 14, enters an ammonia-flue gas static mixer 16 after dust removal and diluted ammonia gas to be uniformly mixed, then enters each SCR reactor 11 to perform denitration and dioxin removal reactions, and the reacted gas continuously enters a desulfurization mechanism 3 to be desulfurized, and the gas reaching the standard after desulfurization is discharged through an outlet of the desulfurization mechanism 3. When the nitrogen-oxygen concentration of the flue gas exhaust pipeline 19 is detected to be ultrahigh in the reaction process, the flue gas regeneration mechanism 2 is started to carry out hot flue gas regeneration on the SCR reactors 11 which are invalid due to ABS, a plurality of SCR reactors 11 are in cyclic reaction operation, and it is ensured that one SCR reactor 11 in the plurality of SCR reactors is in regeneration all the time, and other SCR reactors 11 are in operation.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (4)
1. An online regeneration catalytic denitration and dioxin removal reaction device is characterized by comprising an SCR reaction mechanism (1), a flue gas regeneration mechanism (2) and a desulfurization mechanism (3),
The SCR reaction mechanism (1) comprises a plurality of SCR reactors (11), an ammonia injection assembly (18) and an ammonia-flue gas static mixer (16), wherein the inlet end of the ammonia-flue gas static mixer (16) is respectively connected with the ammonia injection assembly (18) and a flue gas inlet pipeline (14), the outlet pipeline of the ammonia-flue gas static mixer (16) comprises a plurality of first split pipelines (13), each first split pipeline (13) is respectively correspondingly connected with the inlet of each SCR reactor (11), a first control valve (131) is arranged on each first split pipeline (13), the outlet pipeline (12) of each SCR reactor (11) is respectively connected with a flue gas exhaust pipeline (19), a composite functional catalyst layer (111) is arranged in each SCR reactor (11),
A cloth bag dust collector (15) is arranged between the flue gas inlet pipeline (14) and the ammonia-flue gas static mixer (16), an inlet of the cloth bag dust collector (15) is connected with the flue gas inlet pipeline (14), an outlet of the cloth bag dust collector (15) is connected with an inlet end of the ammonia-flue gas static mixer (16),
The inlet end of the flue gas regeneration mechanism (2) is connected with the flue gas exhaust pipeline (19), the outlet end of the flue gas regeneration mechanism comprises a plurality of second shunt pipelines (21), each second shunt pipeline (21) is correspondingly connected with the inlet of each SCR reactor (11) respectively, each second shunt pipeline (21) is provided with an electric regulating valve (22) respectively, the flue gas regeneration mechanism (2) is internally provided with a flue gas heating mechanism,
An inlet of the desulfurization mechanism (3) is connected with the flue gas exhaust pipeline (19), an induced draft fan (17) is arranged on the flue gas exhaust pipeline (19),
The reaction device further comprises a soot blowing mechanism (4), the soot blowing mechanism (4) comprises a compressed air source (41) and a soot blowing end (43), the soot blowing end (43) is connected with the compressed air source (41) through a pipeline and correspondingly arranged above the composite functional catalyst layer (111), and the soot blowing end (43) is a rake type online movable soot blowing device, and a plurality of soot blowing ports (42) are formed in the soot blowing end.
2. The on-line regeneration catalytic denitration and dioxin removal reaction device according to claim 1, characterized in that the ammonia injection assembly (18) comprises an ammonia tank (182), an ammonia mixer (183), a dilution fan (181) and an ammonia injection grid (184), wherein an inlet of the ammonia mixer (183) is connected with the ammonia tank (182) and the dilution fan (181), an outlet end of the ammonia mixer is connected with the ammonia injection grid (184), and the ammonia injection grid (184) is connected with an inlet end of the ammonia-flue gas static mixer (16).
3. The on-line regeneration catalytic denitration and dioxin removal reaction device according to claim 1, characterized in that the number of the SCR reactors (11) is 3.
4. The on-line regeneration catalytic denitration and dioxin removal reaction device according to claim 1 is characterized in that a second control valve (121) is arranged on an outlet pipeline (12) of each SCR reactor (11).
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| CN113441002B (en) * | 2021-07-01 | 2023-01-03 | 重庆大学 | Flue gas denitration device |
| CN116036859B (en) * | 2023-02-23 | 2025-08-26 | 包头钢铁（集团）有限责任公司 | A system suitable for online regeneration of medium and low temperature SCR denitrification catalysts |
| CN117717980B (en) * | 2023-12-14 | 2024-08-23 | 天津大学 | Bisphenol A production process and equipment |
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| KR100917667B1 (en) * | 2009-07-03 | 2009-09-18 | (주)대우건설 | Powder type catalyst continuous regeneration device using incinerator heat |
| GB0922140D0 (en) * | 2009-12-18 | 2010-02-03 | Wellstream Int Ltd | Regeneration of absorption solution |
| EP2497563A1 (en) * | 2011-03-08 | 2012-09-12 | Alstom Technology Ltd | System and method for low NOx emitting regeneration of desiccants |
| CN102343201A (en) * | 2011-10-11 | 2012-02-08 | 南京大学 | Process for removing acid gas from flue gas by using residual heat of flue gas |
| WO2014110882A1 (en) * | 2013-01-18 | 2014-07-24 | 北京神雾环境能源科技集团股份有限公司 | Powdered solid fuel boiler equipped with regenerative rotating commutating heater |
| CN106031841B (en) * | 2015-03-20 | 2020-01-07 | 北京博源恒升高科技有限公司 | Gas denitration process and equipment |
| CN108176224A (en) * | 2015-05-20 | 2018-06-19 | 江苏新世纪江南环保股份有限公司 | A kind of regeneration fume from catalytic cracking ammonia process of desulfurization denitration dust collecting method and device |
| CN204973600U (en) * | 2015-09-09 | 2016-01-20 | 北京方信立华科技有限公司 | Low temperature SCR catalyst on -line regeneration device |
| CN207838717U (en) * | 2018-01-03 | 2018-09-11 | 上海市环境工程设计科学研究院有限公司 | A kind of municipal solid waste incinerator SCR low-temperature denitration catalysts on-line regeneration system |
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