CN105521666A - Integrated device for intercepting and cleaning large-particle dust in SCR (selective catalytic reduction) denitration system - Google Patents
Integrated device for intercepting and cleaning large-particle dust in SCR (selective catalytic reduction) denitration system Download PDFInfo
- Publication number
- CN105521666A CN105521666A CN201610071860.3A CN201610071860A CN105521666A CN 105521666 A CN105521666 A CN 105521666A CN 201610071860 A CN201610071860 A CN 201610071860A CN 105521666 A CN105521666 A CN 105521666A
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- Prior art keywords
- flue
- bulky grain
- filter screen
- ash
- intercepting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
- B01D2275/20—Shape of filtering material
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The invention discloses an integrated device for intercepting and cleaning large-particle dust in an SCR (selective catalytic reduction) denitration system. The integrated device comprises a filter device, blast nozzles and a dust storage device, wherein the filter device is mounted in a flue and used for intercepting the large-particle dust in flue gas; the blast nozzles are mounted at the top of the filter device, located on one flue gas blowing side of the flue and communicated with a high-pressure gas source through a gas conveying pipeline; the dust storage device is mounted at the bottom of the flue and located below the filter device. On the basis that a law of large-particle slag attachment part is researched experimentally, one on-line purging system capable of accurately intercepting large particles is proposed, a self-cleaning function and an intercepting function of a filter screen are combined, the phenomenon that the filter screen is blocked by the large-particle dust is avoided while the large-particle dust is effectively intercepted, the bottleneck of a conventional denitration technology is broken through, the denitration efficiency of the SCR system is guaranteed, and safety, stability and economic efficiency of unit operation are greatly improved.
Description
Technical field
The invention belongs to station boiler flue dedusting technology field, particularly relate in a kind of SCR denitration system the integrated apparatus tackling, clean bulky grain ash.
Background technology
Along with promulgation and the enforcement of " fossil-fuel power plant atmospheric pollutant emission standard " (GB13223-2011), heat-engine plant desulfurized denitration is pushed forward comprehensively, the most of thermal power plant in the whole nation has all carried out large-scale denitration transformation, denitrating flue gas (SCR) system serves new production problem to normal operational system band originally, dust stratification as serious in SCR denitration, and existing dedusting is blown gray technology and be there is input cost and purge the problem such as restriction, govern the safe operation of power plant.SCR denitration device (the SelectiveCatalyticReduction of China's station boiler; SCR) be usually placed between the economizer of boiler and air preheater.Various owing to using coal, and mostly be colm, the dust burdening therefore in flue gas is higher, and especially the dust of bulky grain puffed rice proterties is more.Bulky grain ash can cause catalyst blockage of the micro orifice along with flue gas enters catalyst, causes catalysqt deactivation, and chemical lifetime reduces, and catalyst generation physical abrasion, caves in, and produces security incident, makes channel resistance increase simultaneously.
At present, domestic temporary nothing mature technology of being correlated with solves this problem, therefore frequently occurs the phenomenon of bulky grain ash blocking catalyst, threatens unit safety stable operation, add maintenance cost and operating cost simultaneously.External individual power plants adopts and filter screen is placed in the method that SCR system flue carries out tackling bulky grain ash and solves this problem; but produced problem is simultaneously: because in running, part particle diameter is a bit larger tham the wedge shape bulky grain ash meeting clamping stagnation of aperture of filter screen on filter screen; be not difficult to remove by cleaning means; channel resistance is caused to increase; air-introduced machine power increases, and power consumption aggravates.
When tradition rapping-off-ash mode is applied on filter screen deashing, experimental study shows, due to the pressure effect of air-flow, direct rapping catch net wire side can cause twine to damage, and its structural member of rapping does not almost clear up effect to being attached to online bulky grain ash; Rotatable parts easy bite under high concentration dust environment simultaneously, maintaining costly.For this reason, the present invention, on the basis of the rule of experimental study bulky grain ash attachment area, proposes the interception of a kind of SCR denitration system bulky grain ash and accurate online purging system.Whole system is simple, and without rotary machine, working procedure, maintenance workload is little, and physical dimension is little, takes up room little.
Summary of the invention
The object of this invention is to provide in a kind of SCR denitration system the integrated apparatus tackling, clean bulky grain ash; break through the technical bottleneck that current denitrating system removes bulky grain ash; solve bulky grain ash result in blockage along with flue gas enters catalyst, inactivation, wearing and tearing, channel resistance increase technical problem.
The technical scheme that the present invention solves the problem is as follows: the integrated apparatus tackling, clean bulky grain ash in a kind of SCR denitration system, soot blower is arranged in the flue of selective catalytic reduction denitration device, the flue gas in flue after described soot blower with the catalyst exposure of denitrification apparatus; Described soot blower comprises:
Filter, described filter is arranged in described flue, for retaining the bulky grain dust in flue gas;
Air nozzle, described air nozzle is arranged on the top of described filter, the side that the flue gas being positioned at described flue blows, and is communicated with high-pressure air source by gas pipeline; Air nozzle ejection air-flow purges the plane of pressing close to filtering device filter screen;
Storage apparatus for ash, described storage apparatus for ash is arranged on the bottom of described filter, is positioned at the below of air nozzle.
Tackle, clean the integrated apparatus of bulky grain ash in the present invention's SCR denitration system as above, further, described filter comprises support and filter screen; Described support is connected with the inwall of described flue, and support is for supporting described filter screen.
Tackle, clean the integrated apparatus of bulky grain ash in the present invention's SCR denitration system as above, further, described filter screen can be set to ridge-roof type, plate or undaform according to actual needs.
Tackle, clean the integrated apparatus of bulky grain ash in the present invention's SCR denitration system as above, further, described storage apparatus for ash is positioned at below filter screen, collects the bulky grain ash that filter screen is tackled.
The invention has the beneficial effects as follows:
1, the present invention can adopt different filter structures and air nozzle form flexibly according to different power plant ruuning situation; can effectively tackle bulky grain ash; avoid bulky grain ash blocking catalyst passage; alleviate wearing and tearing and the deactivation phenomenom of catalyst; ensure SCR system denitration efficiency, reduce power plant's operation and maintenance cost.
2, filter screen self-cleaning function and filter screen are tackled function to combine, while effectively tackling bulky grain ash, avoid filter screen by the phenomenon of bulky grain ash blocking, reduce air-introduced machine power consumption, improve the security of power plant's operation, stability and economy.
3, critical piece of the present invention is support, filter screen (ridge-roof type, waveform, plate), air nozzle (Duckbill type, cylindrical), storage apparatus for ash.Have structure simple, number of devices is few, and it is convenient to install, and stable performance is easy to maintenance, low cost and other advantages.
Accompanying drawing explanation
By detailed description done in conjunction with the following drawings, above-mentioned and/or other aspects of the present invention and advantage will become clearer and be easier to understand, and these accompanying drawings just schematically, do not limit the present invention, wherein:
Fig. 1 is the integrated apparatus schematic diagram tackling, clean bulky grain ash in the SCR denitration system of an embodiment of the present invention.
Fig. 2 is integrated apparatus and the flue connection diagram of tackling, cleaning bulky grain ash in the SCR denitration system of an embodiment of the present invention.
Fig. 3 is the air nozzle schematic diagram of an embodiment of the present invention.
Fig. 4 is the schematic side view of Fig. 3.
Fig. 5 is the air nozzle schematic diagram of the another kind of embodiment of the present invention.
Detailed description of the invention
Hereinafter, the embodiment of tackling, cleaning the integrated apparatus of bulky grain ash is described in SCR denitration system of the present invention with reference to the accompanying drawings.
The embodiment recorded at this is specific detailed description of the invention of the present invention, for illustration of design of the present invention, is all explanatory and exemplary, should not be construed as the restriction to embodiment of the present invention and the scope of the invention.Except the embodiment recorded at this, those skilled in the art can also adopt other technical scheme apparent based on the content disclosed in the application's claims and description, and these technical schemes comprise the technical scheme making any apparent substitutions and modifications adopted the embodiment recorded at this.
The accompanying drawing of this description is schematic diagram, and aid illustration design of the present invention schematically shows shape and the correlation thereof of each several part.Note that the structure of each parts for the ease of clearly showing the embodiment of the present invention, not according to identical scale between each accompanying drawing.Identical reference marker is for representing identical part.
Fig. 1, Fig. 2 illustrate in the SCR denitration system of an embodiment of the present invention the integrated apparatus tackling, clean bulky grain ash, soot blower is arranged in the flue of selective catalytic reduction denitration device, the flue gas in flue after described soot blower with the catalyst exposure of denitrification apparatus; Described soot blower comprises:
Filter, described filter is arranged in described flue, for retaining the bulky grain dust in flue gas;
Air nozzle 2, described air nozzle is arranged on the top of described flue, and the side that the flue gas being positioned at described filter blows; Air nozzle ejection air-flow purges the plane of pressing close to filtering device filter screen; Source of the gas 3, is communicated with by air flue 4 between described source of the gas with described air nozzle;
Storage apparatus for ash 5, described storage apparatus for ash is arranged on the bottom of described flue, is positioned at the below of air nozzle.
When tackling, clean the integrated apparatus embody rule of bulky grain ash in the above embodiment of the present invention SCR denitration system, described filter comprises support 6 and filter screen 1; Described support 6 is connected with the inwall of described flue, and support 6 is for supporting described filter screen 1.
Before screen cloth is placed in the catalyst of SCR denitration device by the above embodiment of the present invention, filter screen size and placement location are according to flue form design.Support is played a supporting role for filter screen in the channel, and filter screen, for tackling the bulky grain ash in flue gas, is provided with gas pipeline above filter screen, pipeline is equipped with air nozzle.Air nozzle is for purging the bulky grain ash that filter screen is detained, and purging air is provided by source of the gas, the bulky grain ash that storage apparatus for ash tackle for collecting flue gas inertial separation ash out and filter screen, and the bulky grain that air nozzle purges is grey.Along with the increase of running time, filter screen tackle bulky grain ash some can be stranded on filter screen, cause resistance to increase.Now UNICOM's source of the gas, air is after air nozzle, and air curtain together with being formed at the bulky grain ash intersection of filter screen and delay, is blown into the bulky grain be stranded on filter screen ash in storage apparatus for ash corresponding with it.It is emphasized that the distribution situation in conjunction with flue gas duct takes in by the position of whole soot blower.
When tackling, clean the integrated apparatus embody rule of bulky grain ash in the above embodiment of the present invention SCR denitration system, described air nozzle can be Duckbill type or column type air nozzle according to actual needs.As shown in Figure 3, Figure 4, Duckbill type air nozzle is made up of passage section ever-reduced step-down speedup section and purging area expanding section.As shown in Figure 5, column type air nozzle is the ever-reduced cylinder of passage section, plays the effect of step-down speedup, and exit flow impact energy is large, strong to being purged ability by card particle.
When tackling, clean the integrated apparatus embody rule of bulky grain ash in the above embodiment of the present invention SCR denitration system, described filter screen has polytype, can become ridge-roof type according to the actual needs flexible design of different power plant, plate, undaform.
Ridge-roof type, form plate group by polylith plate filter screen by certain angle overlap joint, filter area significantly increases, flue gas is reduced by the flow velocity of filter screen normal, and resistance to corrosion strengthens, and service life extends, crushing is lower, and can select this form when adaptable flue gas flow rate is 10 ~ 20m/s, crushing is about 50Pa.
Undaform, performance is between plate and ridge-roof type.
Plate, wire netting is in one plane spliced, and version is simple, and processing and fabricating is convenient, is applicable to the situation of installing and usage space is limited.Adaptable flue gas flow rate is below 15m/s, and crushing is about 100Pa.
In addition, filter screen has multiple material and can select, and such as described filter screen is steel 316L, 2CR13, Q235+SIC.
When tackling, clean the integrated apparatus embody rule of bulky grain ash in the above embodiment of the present invention SCR denitration system, source of the gas can be provided by the flue gas etc. after high power air compressor, seal fan, dedusting.
When tackling, clean the integrated apparatus embody rule of bulky grain ash in the above embodiment of the present invention SCR denitration system, in order to the cleaning action making filter screen keep good, maintain pressure drop and stablize, blow the timing of grey process and intermittently carry out.
When tackling, clean the integrated apparatus embody rule of bulky grain ash in the above embodiment of the present invention SCR denitration system, only install 3-10 air nozzle for dust stratification region, online precisely purging, saves operating cost.
Each technical characteristic of above-mentioned disclosure is not limited to that disclosed with combination that is further feature, other combination that those skilled in the art also can carry out between each technical characteristic according to the object of invention, is as the criterion with the object realizing the present invention.
Claims (4)
1. tackle in SCR denitration system, the integrated apparatus of cleaning bulky grain ash, it is characterized in that, soot blower is arranged in the flue of selective catalytic reduction denitration device, the flue gas in flue after described soot blower with the catalyst exposure of denitrification apparatus; Described soot blower comprises:
Filter, described filter is arranged in described flue, for retaining the bulky grain dust in flue gas;
Air nozzle, described air nozzle is arranged on the top of described filter, the side that the flue gas being positioned at described flue blows, and is communicated with high-pressure air source by gas pipeline;
Storage apparatus for ash, described storage apparatus for ash is arranged on the bottom of described filter, is positioned at the below of air nozzle.
2. tackle, clean the integrated apparatus of bulky grain ash in SCR denitration system according to claim 1, it is characterized in that, described filter comprises support and filter screen; Described support is connected with the inwall of described flue, and support is for supporting described filter screen.
3. tackle, clean the integrated apparatus of bulky grain ash in SCR denitration system according to claim 2, it is characterized in that, described filter screen can be set to ridge-roof type, plate or undaform according to actual needs.
4. tackle, clean the integrated apparatus of bulky grain ash in SCR denitration system according to claim 2, it is characterized in that, described storage apparatus for ash is positioned at below filter screen, collects the bulky grain ash that filter screen is tackled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610071860.3A CN105521666A (en) | 2016-02-02 | 2016-02-02 | Integrated device for intercepting and cleaning large-particle dust in SCR (selective catalytic reduction) denitration system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610071860.3A CN105521666A (en) | 2016-02-02 | 2016-02-02 | Integrated device for intercepting and cleaning large-particle dust in SCR (selective catalytic reduction) denitration system |
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| CN105521666A true CN105521666A (en) | 2016-04-27 |
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| CN201610071860.3A Pending CN105521666A (en) | 2016-02-02 | 2016-02-02 | Integrated device for intercepting and cleaning large-particle dust in SCR (selective catalytic reduction) denitration system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105833726A (en) * | 2016-05-03 | 2016-08-10 | 艾尼科环保技术(安徽)有限公司 | SCR catalyst blockage removing device |
| CN106215696A (en) * | 2016-09-22 | 2016-12-14 | 中冶焦耐(大连)工程技术有限公司 | Flue gases of cock oven SCR denitration is anti-blocking, Method of blockage removal and device |
| CN106268313A (en) * | 2016-09-22 | 2017-01-04 | 中冶焦耐(大连)工程技术有限公司 | A kind of flue gases of cock oven SCR denitration guard method and device |
| CN107185908A (en) * | 2017-05-10 | 2017-09-22 | 哈尔滨工程大学 | A kind of soot blower and ash-blowing method in denitrating system rectangle reaction unit peculiar to vessel |
| CN108854287A (en) * | 2018-07-17 | 2018-11-23 | 江苏中建材环保研究院有限公司 | A kind of cement kiln SCR denitration device and technique with bulky grain ash blocking apparatus |
| CN110774322A (en) * | 2019-11-08 | 2020-02-11 | 南通德亿新材料有限公司 | Quick stripping off device of thermoplastic polyurethane elastomer |
| CN111013379A (en) * | 2019-11-29 | 2020-04-17 | 华电电力科学研究院有限公司 | Reciprocating type vibration device for reducing dust accumulation and blockage of SCR denitration catalyst and working method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105833726A (en) * | 2016-05-03 | 2016-08-10 | 艾尼科环保技术(安徽)有限公司 | SCR catalyst blockage removing device |
| CN106215696A (en) * | 2016-09-22 | 2016-12-14 | 中冶焦耐(大连)工程技术有限公司 | Flue gases of cock oven SCR denitration is anti-blocking, Method of blockage removal and device |
| CN106268313A (en) * | 2016-09-22 | 2017-01-04 | 中冶焦耐(大连)工程技术有限公司 | A kind of flue gases of cock oven SCR denitration guard method and device |
| CN107185908A (en) * | 2017-05-10 | 2017-09-22 | 哈尔滨工程大学 | A kind of soot blower and ash-blowing method in denitrating system rectangle reaction unit peculiar to vessel |
| CN108854287A (en) * | 2018-07-17 | 2018-11-23 | 江苏中建材环保研究院有限公司 | A kind of cement kiln SCR denitration device and technique with bulky grain ash blocking apparatus |
| CN110774322A (en) * | 2019-11-08 | 2020-02-11 | 南通德亿新材料有限公司 | Quick stripping off device of thermoplastic polyurethane elastomer |
| CN111013379A (en) * | 2019-11-29 | 2020-04-17 | 华电电力科学研究院有限公司 | Reciprocating type vibration device for reducing dust accumulation and blockage of SCR denitration catalyst and working method thereof |
| CN111013379B (en) * | 2019-11-29 | 2024-06-04 | 华电电力科学研究院有限公司 | Reciprocating vibration device for reducing dust accumulation and blockage of SCR denitration catalyst and working method of reciprocating vibration device |
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