CN204073846U - A kind of ammonia for SCR denitration technique and exhaust mixer - Google Patents
A kind of ammonia for SCR denitration technique and exhaust mixer Download PDFInfo
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- CN204073846U CN204073846U CN201420443739.5U CN201420443739U CN204073846U CN 204073846 U CN204073846 U CN 204073846U CN 201420443739 U CN201420443739 U CN 201420443739U CN 204073846 U CN204073846 U CN 204073846U
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Abstract
The utility model discloses a kind of ammonia for SCR denitration technique and exhaust mixer, comprise a housing, one end of described housing is gas approach, and the other end relative with gas approach is exhanst gas outlet; And middle part cowling panel is installed on the central axis of housing, what described middle part cowling panel was positioned at gas approach end is circumferentially provided with straightener(stator) blade; In the surrounding of enclosure interior, one circle periphery cowling panel is installed; The bottom of described middle part cowling panel is provided with sealing steel plate; Between the bottom of periphery cowling panel and housing, sealing steel plate is also installed.This blender is owing to being provided with periphery cowling panel, its flow section is less than the flow section of flue, first the flue gas entering blender forms the increase of local flue gas pressure to light section through big cross section, flue gas enters the SCR reactor of big cross section after going out blender, flue gas pressure has reduction, effective formation eddy current, realizes the abundant mixing of flue gas.
Description
Technical field
The utility model relates to a kind of ammonia for SCR denitration technique and exhaust mixer, belongs to ammonia and this technical field of exhaust mixer.
Background technology
China is that a few take coal as one of country of main energy sources in the world, and according to statistics, nitrogen oxide (NOx) discharge capacity of China 67% comes from the burning of coal.According to State Environmental Protection Administration's statistics, 2005 and power plants coal consumption amount in 2010 account for 56% and 64% of national total amount respectively, and thermal power plant's NOx generation accounts for 50% of national total amount.From fire coal consumption to NOx emission contribution margin, it is China's NOx emission overall control key point that thermal power plant's NOx emission controls." thermal power plant's atmosphere pollution control discharge standard " up-to-date along with China and the issuing and implementation of the Air Pollution Prevention Law and the formally effective of Kyoto Protocol, the domestic emission control to NOx will be increasingly strict, adopt effective NOx emission control measure imperative in thermal power plant.
The gas denitrifying technology generally adopted at present mainly contains SCR technology (Selective Catalytic Reduction, be called for short SCR), SNCR technology (Selective Non-Catalytic Reduction, be called for short SNCR) and SNCR/SCR mixed flue gas denitration technology.
In current various denitration technology, selective-catalytic-reduction denitrified (SCR) is that application is maximum, most effective and be one of the most ripe technology.First this technology was grown up by Japan at beginning of the eighties late 1970s, and the rapid power station in countries and regions such as Japan, Europe, the U.S. is applied afterwards.The research of China's gas denitrifying technology is carried out relatively late.Built or the denitration engineering planned to build is almost all to buy American-European and the Japanese technology right to use at present, part enviromental protection enterprise has also grasped certain gas denitrifying technology by the mode of independent development or import, digestion and absorption, but core technology (particularly catalyst) still unrealized production domesticization, and introduce technology exist technology usage charges high, be difficult to grasp core technology, upgradability difference etc. an outstanding difficult problem, govern China NOx administer carry out.
Affect the many factors of SCR system denitration efficiency, as reaction temperature, reaction time, ammonia/nitrogen mol ratio etc.In addition, flue gas and NH
3mixability and the uniformity in flow field be also one of key factor affecting denitration efficiency, troubled water good between reactant and uniform flow field are the bases ensureing higher N0x removal efficiency.If good mixing, the NOx in flue gas is energy and NH just
3abundant contact, thus for N0x reduction reaction effectively carry out provide good bar assorted.If troubled water is poor, the situation of NH3 concentration and NOx concentration skewness will be there is.Certain NOx is distributed and ammonia/nitrogen mol ratio design load, just there will be some region NH
3concentration is not enough, and some region NH
3excessive.NH
3the region N0x of concentration deficiency can not be substantially completely removed, and therefore, denitration efficiency can not be guaranteed; And NH
3the region of concentration excess will respond remaining NH
3flow to the downstream areas such as air preheater, thus cause so-called " NH
3leak ", add upstream device corrosion and the possibility blocked.Therefore, good mixing seems particularly important.Equally, uniform flow field bar is assorted, and namely can to flow through the reaction volume in each catalyst duct in guarantor unit's time equal for uniform velocity flow profile, thus avoid the problem that partially catalyzed agent flue gas load is too high, partially catalyzed agent does not make full use of.
But, in the running of reality, the troubled water of absolute ideal and completely uniform flow field can not be occurred, but the uniformity situation in flow field can reach the effect of improvement by the layout optimizing SCR system Inner guide device.The pressure drop of denitrating system is also should be noted that in the process of preferred arrangement, namely flue gas flows through the pressure loss of SCR denitration reactor, because too high Pressure Drop can increase air-introduced machine power consumption, and have influence on the safe operation of boiler main frame and air-introduced machine, so usually require that the Pressure Drop of denitrification apparatus is less than 1000Pa.
Therefore, the uniformity situation in SCR reactor flow field is studied, the design arrangement scheme of reasonable promotes that reactant fully mixes to reach good uniformity effects as far as possible, and meet the restrictive requirement of SCR system pressure drop simultaneously, for: improve the performance of SCR denitration system, so that the development carrying forward vigorously China's denitrating flue gas cause from now on has important practical significance and wide Research Prospects.
Utility model content
For the ammonia used in existing SCR denitration technology and uneven, the blender pressure drop of exhaust mixer mixing large, make the deficiencies such as loaded down with trivial details, the utility model provides a kind of ammonia for SCR denitration technique and exhaust mixer.
The technical solution adopted in the utility model is as follows:
For ammonia and the exhaust mixer of SCR denitration technique, comprise a housing, one end of described housing is gas approach, and the other end relative with gas approach is exhanst gas outlet; And middle part cowling panel is installed on the central axis of housing, what described middle part cowling panel was positioned at gas approach end is circumferentially provided with straightener(stator) blade; And in the surrounding of enclosure interior, one circle periphery cowling panel is installed; The bottom of described middle part cowling panel is provided with sealing steel plate; Between the bottom of periphery cowling panel and housing, sealing steel plate is also installed.
Described straightener(stator) blade comprises 6, and 6 straightener(stator) blades are arranged on middle part cowling panel circumferentially uniformly.
Described periphery cowling panel, middle part cowling panel are sealing steel plate.
Described housing is all provided with a flange at gas approach end, smoke outlet.
Described middle part cowling panel entirety is eight prisms, and the head of eight prisms is taper octahedron.
Octahedral space is formed between described periphery cowling panel and middle part cowling panel.
The shape of described straightener(stator) blade is rectangle.
Described ammonia and exhaust mixer are arranged on SCR reactor inlet, and blender remains on more than 3 meters with the distance of spray ammonia position.
During use, the ammonia described in two, together with exhaust mixer lateral connection, is arranged on SCR reactor inlet.
The course of work of the present utility model is as follows:
After this blender is arranged on economizer flue outlet ammonia-spraying grid, before SCR reactor, usual and SCR reactor carries out Flange joint.Flue gas containing atomization ammonia is drawn by the negative pressure of boiler induced-draft fan, blender is entered downwards from top, produce eddy current through blender straightener(stator) blade (internal mixer flue gas flow rate controls at 18m/s), realize the SCR reactor directly entering bottom after ammonia and waste gas fully mix.
The beneficial effects of the utility model are as follows:
First, in the mixed cell of SCR denitration technology ammonia and waste gas, ammoniacal liquor sprays through internal-mixing atomizing lance, is effectively atomized, this blender be with internal-mixing atomizing lance with the use of a kind of blender, mixed flue gas mixes by secondary to reach the object mixed by it.
Secondly, this blender eliminates the loaded down with trivial details structure of conventional mixer, reduces the pressure loss of gas by gaseous mixture simultaneously.Have that structure is simple, the length of main paragraph is little, the atomization advantages such as ammonia mixes with waste gas, pressure drop is low, cost of manufacture is low, can run for a long time in hot environment.
In addition, this blender is owing to being provided with periphery cowling panel, its flow section is less than the flow section of flue, first the flue gas entering blender forms the increase of local flue gas pressure to light section through big cross section, flue gas enters the SCR reactor of big cross section after going out blender, flue gas pressure has reduction, effectively forms eddy current, realizes the abundant mixing of flue gas.
Accompanying drawing explanation
Fig. 1 is SCR denitration technique ammonia/waste gas mixed cell schematic diagram.
Fig. 2 is ammonia/exhaust mixer plan structure figure.
Fig. 3 is ammonia/exhaust mixer side-looking structure chart.
Fig. 4 is ammonia/exhaust mixer forward sight structure chart.
Fig. 5 is ammonia/exhaust mixer face upwarding assumption diagram.
In figure: 1 ammonia-spraying grid, 2 deflectors, 3 ammonia/exhaust mixer, 4 flying dust rectifiers, 5 SCR reactors, 6 catalyst layers; 7 mixed flue gas inlet flanges, 8 mixed flue gas outlet(discharge) flanges, 9 sealing steel plates, cowling panel in the middle part of in the of 10,11 periphery cowling panels, 12 straightener(stator) blades, 13 exhaust gases passes.
Detailed description of the invention
Below in conjunction with accompanying drawing, this practicality is described in detail:
As shown in Figure 1, SCR denitration technique ammonia/waste gas mixed cell is included in the ammonia-spraying grid 1 installed successively in flue, deflector 2, ammonia/exhaust mixer 3, flying dust rectifier 4, SCR reactor 5, catalyst layer 6; In the mixed cell of SCR denitration technology ammonia and waste gas, ammonia/exhaust mixer 3 installation site is positioned at SCR reactor inlet, with spray ammonia position and certain distance; This feature, effectively utilizes ammonia atomization nozzle to the effect of gas and vapor permeation, makes mixed flue gas have longer action time to the energy of atomized spray and effect, to reach well-mixed object; The flue gas flowing through blender directly enters SCR reactor, ensures being fully utilized of flue gas immixture.
Embodiment 1
Ammonia/exhaust mixer 3 comprises a housing, and one end of housing is gas approach, and the other end relative with gas approach is exhanst gas outlet; And middle part cowling panel 10 is installed on the central axis of housing, described middle part cowling panel 10 is positioned at the end of gas approach, and it is circumferentially provided with straightener(stator) blade 12; And in the surrounding of enclosure interior, one circle periphery cowling panel 11 is installed; The gap that housing and straightener(stator) blade 12, periphery cowling panel 11, middle part cowling panel 10 are formed is exhaust gases passes 13.The bottom of middle part cowling panel is provided with sealing steel plate 9; Also be provided with between the bottom of periphery cowling panel and housing and seal steel plate 9.
In the front-end and back-end of housing, mixed flue gas inlet flange 7 and mixed flue gas outlet(discharge) flange 8 are installed.
Straightener(stator) blade 12 comprises 6, and 6 straightener(stator) blades are arranged on middle part cowling panel circumferentially uniformly.
Embodiment 2
Ammonia/exhaust mixer 3 comprises a housing, and one end of housing is gas approach, and the other end relative with gas approach is exhanst gas outlet; And in housing, be provided with two be parallel to each other and the middle part cowling panel 10 symmetrical relative to casing centerline, remaining structure is consistent with said structure, does not launch in detail at this.
Two above-mentioned blenders eliminate the loaded down with trivial details structure of conventional mixer, reduce the pressure loss of gas by gaseous mixture simultaneously.Have that structure is simple, the length of main paragraph is little, the atomization advantages such as ammonia mixes with waste gas, pressure drop is low, cost of manufacture is low, can run for a long time in hot environment.
Blender flow section is less than the flow section of flue, first the flue gas entering blender forms the increase of local flue gas pressure to light section through big cross section, flue gas enters the SCR reactor of big cross section after going out blender, flue gas pressure has reduction, effective formation eddy current, realizes the abundant mixing of flue gas.
Claims (8)
1. for ammonia and the exhaust mixer of SCR denitration technique, comprise a housing, one end of described housing is gas approach, and the other end relative with gas approach is exhanst gas outlet; It is characterized in that: and middle part cowling panel is installed on the central axis of housing, what described middle part cowling panel was positioned at gas approach end is circumferentially provided with straightener(stator) blade; In the surrounding of enclosure interior, one circle periphery cowling panel is installed; The bottom of described middle part cowling panel is provided with sealing steel plate; Between the bottom of periphery cowling panel and housing, sealing steel plate is also installed.
2. as claimed in claim 1 for ammonia and the exhaust mixer of SCR denitration technique, it is characterized in that: described straightener(stator) blade comprises 6,6 straightener(stator) blades are arranged on middle part cowling panel circumferentially uniformly.
3., as claimed in claim 1 for ammonia and the exhaust mixer of SCR denitration technique, it is characterized in that: described housing is all provided with a flange at gas approach end, smoke outlet.
4. as claimed in claim 1 for ammonia and the exhaust mixer of SCR denitration technique, it is characterized in that: described middle part cowling panel entirety is eight prisms, and the head of eight prisms is taper octahedron.
5., as claimed in claim 1 for ammonia and the exhaust mixer of SCR denitration technique, it is characterized in that: between described periphery cowling panel and middle part cowling panel, form octahedral space.
6., as claimed in claim 1 for ammonia and the exhaust mixer of SCR denitration technique, it is characterized in that: during use, the ammonia described in two, together with exhaust mixer lateral connection, is arranged on SCR reactor inlet.
7., as claimed in claim 1 for ammonia and the exhaust mixer of SCR denitration technique, it is characterized in that: the shape of described straightener(stator) blade is rectangle.
8., as claimed in claim 1 for ammonia and the exhaust mixer of SCR denitration technique, it is characterized in that: described ammonia and exhaust mixer are arranged on SCR reactor inlet, blender remains on more than 3 meters with the distance of spray ammonia position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420443739.5U CN204073846U (en) | 2014-08-07 | 2014-08-07 | A kind of ammonia for SCR denitration technique and exhaust mixer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420443739.5U CN204073846U (en) | 2014-08-07 | 2014-08-07 | A kind of ammonia for SCR denitration technique and exhaust mixer |
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| CN204073846U true CN204073846U (en) | 2015-01-07 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105465109A (en) * | 2016-01-07 | 2016-04-06 | 华北电力科学研究院有限责任公司 | Swirl vane and flue gas ammonia-injection and denitration device |
| CN106051755A (en) * | 2016-07-25 | 2016-10-26 | 山东巨亚环保科技股份有限公司 | Flue gas purifying device and circulating fluidized bed boiler with device |
| CN112957886A (en) * | 2021-03-11 | 2021-06-15 | 于航 | Solve too big multitube plasma SOx/NOx control device of traditional volume |
-
2014
- 2014-08-07 CN CN201420443739.5U patent/CN204073846U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105465109A (en) * | 2016-01-07 | 2016-04-06 | 华北电力科学研究院有限责任公司 | Swirl vane and flue gas ammonia-injection and denitration device |
| CN106051755A (en) * | 2016-07-25 | 2016-10-26 | 山东巨亚环保科技股份有限公司 | Flue gas purifying device and circulating fluidized bed boiler with device |
| CN112957886A (en) * | 2021-03-11 | 2021-06-15 | 于航 | Solve too big multitube plasma SOx/NOx control device of traditional volume |
| CN112957886B (en) * | 2021-03-11 | 2022-12-09 | 灵石县聚鑫钙业有限公司 | Solve too big multitube plasma SOx/NOx control device of traditional volume |
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| C14 | Grant of patent or utility model | ||
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| CP03 | Change of name, title or address |
Address after: 250101, Shandong Province, Ji'nan hi tech Zone, No. 554 Feng Feng Road, environmental science and Technology Park, building 8, Feng Feng building, room 532 Patentee after: Shandong Pacific Environmental Protection Limited by Share Ltd Address before: 250101, 554, Feng Lu, Licheng District, Ji'nan, Shandong Patentee before: Shandong Pacific Environmental Protection Co.,Ltd. |