CN202909629U - Reversed-injection ammonia injection element - Google Patents

Reversed-injection ammonia injection element Download PDF

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Publication number
CN202909629U
CN202909629U CN 201220546218 CN201220546218U CN202909629U CN 202909629 U CN202909629 U CN 202909629U CN 201220546218 CN201220546218 CN 201220546218 CN 201220546218 U CN201220546218 U CN 201220546218U CN 202909629 U CN202909629 U CN 202909629U
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CN
China
Prior art keywords
injection
ammonia
spray ammonia
anemostat
nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CN 201220546218
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Chinese (zh)
Inventor
彭德强
王明星
李欣
姜阳
陈新
刘志禹
王岩
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Petroleum and Chemical Corp
Sinopec Fushun Research Institute of Petroleum and Petrochemicals
Original Assignee
China Petroleum and Chemical Corp
Sinopec Fushun Research Institute of Petroleum and Petrochemicals
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Filing date
Publication date
Application filed by China Petroleum and Chemical Corp, Sinopec Fushun Research Institute of Petroleum and Petrochemicals filed Critical China Petroleum and Chemical Corp
Priority to CN 201220546218 priority Critical patent/CN202909629U/en
Application granted granted Critical
Publication of CN202909629U publication Critical patent/CN202909629U/en
Anticipated expiration legal-status Critical
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Abstract

The utility model discloses a reversed-injection ammonia injection element. The reversed-injection ammonia injection element comprises ammonia injection pipes, injection nozzles and diffusion pipes, wherein the diffusion pipes comprise straight pipe sections, horn mouths and diversion cylinders; a plurality of injection nozzles are arranged on each ammonia injection pipe; openings of the injection nozzles face upwards; one diffusion pipe corresponds to the upper part of each injection nozzle; and each injection nozzle extends into each diffusion pipe. Compared with the prior art, the reversed-injection ammonia injection element disclosed by the utility model has the characteristics that the injection nozzles are densely arranged along the section of a flue, so that flue gas suction areas of various diffusion pipes are superposed and further the uniformity in distribution of ammonia is ensured; the openings of the injection nozzles face upwards and are opposite to flue gas in flow direction; ammonia gas and the flue gas form a reverse flow state; and the diversion cylinders are arranged in the diffusion pipes and used for limiting the flow direction of the ammonia, and form a favorable mixing effect with the ammonia gas.

Description

A kind of reverse spray type spray ammonia element
Technical field
The utility model relates to a kind of spray ammonia element of oil plant FCC regenerated flue gas denitrification apparatus, particularly relates to a kind of spray ammonia element of refinery FCC regenerated flue gas SCR SCR denitrating technique.
Background technology
Nitrogen oxide (NOx) is one of primary pollution source of atmosphere pollution.Nitrogen oxide comprises multiple compounds such as nitrous oxide, nitric oxide, nitrogen dioxide, nitrogen trioxide, dinitrogen tetroxide and dinitrogen pentoxide etc.Oil plant is one of main discharged nitrous oxides source, and the NOx amount in the FCC flue gas generally accounts for 50% of the full NOx of factory discharge capacity, is the NOx emission source of oil plant maximum.
The FCC gas denitrifying technology mainly comprises at present: the selective catalytic reduction of gas-phase reaction (SCR method) and SNCR method (SNCR method), liquid absorption method, solid absorption method and high energy electron active oxidation method etc.
The SCR method is under catalyst action, utilize reducing agent selectively with flue gas in NOx reaction, and generate the N of nonhazardous effect 2And H 2The technology of O, its reducing agent can be ammonia, ammoniacal liquor or urea, also can select CO or H 2, also can select little molecule alkane.The SCR technology is compared with other technologies, has a denitration efficiency high, and thermal discharge is little, and the advantages such as technology maturation are to use maximum technology in the Flue Gas Denitrification Engineering both at home and abroad at present.
In the SCR gas denitrifying technology, ammonia (NH 3) and nitrogen oxide (NO x) mixed effect and the denitration efficiency of denitrification apparatus close relationship is arranged, if reducing agent and NO xThat mixes is insufficient, can cause NH in the regional area 3/ NO xMol ratio is excessively low, will greatly reduce system's denitration efficiency.In the case, want to reach NO xThe discharge capacity index request certainly will increase the consumption of catalyst or the consumption of ammonia, causes operating cost to increase or the amount of ammonia slip increase, forms secondary pollution.
Traditional NH 3And NO xUtilize NH in the mixed method 3And NO xBetween concentration difference, mix by natural diffusion way, therefore need very long mixing distance and NH 3And NO xUndercompounding.
CN201394414Y has introduced a kind of ejection ammonia mixed organization of SCR reaction unit, comprises a charging house steward and several distributing pipe; Lower surface at distributing pipe is provided with some nozzles, and is provided with accordingly the deflector that is comprised of several static mixing blades below nozzle; Nozzle is tubaeform, sprays resistance to reduce ammonia; The nozzle below is provided with induction tunnel accordingly, and this induction tunnel is the Venturi tube of large aditus laryngis, forms secondary drainage.The weak point of this mechanism is, generally, the flue gas that participates in mixing only accounts for 30% ~ 70% of total flue gas, impact spray ammonia effect.
CN101601965A has introduced a kind of ammonia-spraying grid device of SCR method denitrating flue gas, includes the ammonia-spraying grid that the metal tube bank forms, and the footpath of each root metal tube upwards is provided with nozzle; The angle of the opening direction of nozzle and flow of flue gas direction is 0~90 °.The weak point of this structure is, lacks turbulent element, causes linearly flowing along injection direction through the ammonia of nozzle ejection, only can mix with partial fume impact spray ammonia effect.
Summary of the invention
Not enough for prior art, the utility model provides the reverse spray type spray ammonia element of a kind of FCC flue gas selective reduction denitration (SCR) reactor, is intended to solve in the prior art ammonia and mixes inhomogeneously with flue gas, affects the problem of spraying the ammonia effect.
The reverse spray type spray ammonia element of the selective-catalytic-reduction denitrified reactor of the utility model comprises spray ammonia pipe, nozzle and anemostat; Be provided with some nozzles at every spray ammonia pipe, nozzle opening upwards, and is opposite with flue gas flow direction; Each corresponding anemostat in nozzle top, wherein said anemostat comprises straight length, horn mouth and guide shell, described nozzle extends in the anemostat.
In the reverse spray type spray ammonia element of the utility model SCR reactor, nozzle opening is upwards, and is opposite with flue gas flow direction, its axis and anemostat dead in line, and extend in the anemostat.Described nozzle is along the intensive layout in flue cross section, to guarantee the even distribution of ammonia; Anemostat is fixed on spray ammonia pipe top, is the broadening formation structure with straight length.Guide shell is set in anemostat, and guide shell bus subtended angle and anemostat horn mouth subtended angle are identical or different, and the subtended angle scope is 10 ° ~ 60 °.
Compare with spray ammonia element of the prior art, the utility model nozzle makes each anemostat suction flue gas area coincidence along the intensive layout in flue cross section, guarantees the even distribution of ammonia.Nozzle opening upwards, and is opposite with flue gas flow direction, and ammonia and flue gas form the adverse current fluidised form.Guide shell is set in anemostat, the flow direction of restriction ammonia, thus form good mixed effect with flue gas.
Description of drawings
Fig. 1 is the utility model spray ammonia element front view.
Fig. 2 is the utility model spray ammonia element anemostat structural representation.
Fig. 3 is the utility model spray ammonia element work schematic diagram.
The specific embodiment
Further specify concrete structure and the occupation mode of reverse spray type spray ammonia element of the present utility model below in conjunction with accompanying drawing.
As depicted in figs. 1 and 2, the structure of reverse spray type spray ammonia element of the present utility model is as follows: described spray ammonia element comprises spray ammonia pipe 1, nozzle 2 and anemostat 3.Described spray ammonia pipe 1 is evenly arranged along the flue cross section is intensive.Wherein anemostat 3 comprises straight length 31, horn mouth 32 and guide shell 33.Be equipped with some nozzles 2 at every spray ammonia pipe 1, the opening upwards of nozzle 2 is opposite with flue gas flow direction.The all corresponding anemostat 3 in the top of each nozzle 2, the lower end of nozzle 2 connects with spray ammonia pipe upper surface, and nozzle 2 upper ends extend in the anemostat 3.
In conjunction with Fig. 2 and Fig. 3, in the reverse spray type spray ammonia element of the present utility model, nozzle opening upwards, and is opposite with flue gas flow direction.The axis of nozzle 2 and anemostat dead in line, its upper end extends in the anemostat straight length 31, and nozzle 2 can guarantee the even distribution of ammonia along the intensive layout in flue cross section.Anemostat 3 is fixed on spray ammonia pipe 1 top, and by straight length 31, horn mouth 32 and guide shell 33 form.Wherein said guide shell 33 is the cone cylindrical structure, and its vertex of a cone is positioned at horn mouth, and the cone end stretch goes out horn mouth.Described guide shell 3 becomes the inclination fluidised form with the vertically upward fluidised form of ammonia, forms adverse current with flue gas, is conducive to fully mixing of ammonia and flue gas.Conical flow guiding cylinder bus subtended angle and anemostat horn mouth subtended angle are identical or different, preferably adopt identical subtended angle, and subtended angle α scope is 10 °~60 °; The cone floor space of conical flow guiding cylinder is generally 0.5~0.8 times of horn mouth sectional area.The length of described straight length is generally 1~4 times of straight length diameter.
Reverse spray type spray ammonia element of the present utility model in use, flue gas is flowed through from the top down and is sprayed the ammonia element, ammonia sprays into and is sprayed by nozzle through spray ammonia pipe, flow from bottom to top, behind the water conservancy diversion of horn mouth inner draft tube, form the adverse current fluidised form with flue gas, be issued to good mixed effect in the dissection of flue gas.

Claims (9)

1. a reverse spray type spray ammonia element is characterized in that, described spray ammonia element comprises spray ammonia pipe, nozzle and anemostat; Be provided with some nozzles at every spray ammonia pipe, nozzle opening upwards, and is opposite with flue gas flow direction; Each corresponding anemostat in nozzle top, wherein said anemostat comprises straight length, horn mouth and guide shell, described nozzle extends in the anemostat.
2. according to spray ammonia element claimed in claim 1, it is characterized in that, described guide shell is arranged in the horn mouth.
3. according to spray ammonia element claimed in claim 2, it is characterized in that, described guide shell is the cone barrel structure, and wherein the vertex of a cone is positioned at horn mouth, and the cone end stretch goes out horn mouth.
4. according to spray ammonia element, the axis of wherein said nozzle and anemostat dead in line claimed in claim 1.
5. according to spray ammonia element claimed in claim 3, it is characterized in that, the bus subtended angle of described guide shell is 10 ° ~ 60 °, and the horn mouth subtended angle of described anemostat is 10 ° ~ 60 °.
6. according to claim 3 or 5 described spray ammonia elements, it is characterized in that, described guide shell bus subtended angle and anemostat horn mouth subtended angle are identical or different.
7. according to spray ammonia element claimed in claim 1, it is characterized in that the axis of described guide shell and the dead in line of anemostat.
8. according to spray ammonia element claimed in claim 1, it is characterized in that, the cone floor space of described conical flow guiding cylinder is 0.5~0.8 times of horn mouth sectional area.
9. according to spray ammonia element claimed in claim 1, it is characterized in that, the length of described straight length is 1~4 times of straight length diameter.
CN 201220546218 2012-10-24 2012-10-24 Reversed-injection ammonia injection element Expired - Lifetime CN202909629U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220546218 CN202909629U (en) 2012-10-24 2012-10-24 Reversed-injection ammonia injection element

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Application Number Priority Date Filing Date Title
CN 201220546218 CN202909629U (en) 2012-10-24 2012-10-24 Reversed-injection ammonia injection element

Publications (1)

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CN202909629U true CN202909629U (en) 2013-05-01

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105311959A (en) * 2015-12-09 2016-02-10 光大环保(中国)有限公司 Ammonia spraying grid for low-temperature SCR denitrification system
CN107081055A (en) * 2017-04-17 2017-08-22 山东大学 A kind of eddy flow combined type SCR static mixers
CN113559705A (en) * 2021-08-05 2021-10-29 西安热工研究院有限公司 Drainage type SCR denitration urea direct injection system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105311959A (en) * 2015-12-09 2016-02-10 光大环保(中国)有限公司 Ammonia spraying grid for low-temperature SCR denitrification system
CN107081055A (en) * 2017-04-17 2017-08-22 山东大学 A kind of eddy flow combined type SCR static mixers
CN107081055B (en) * 2017-04-17 2019-08-23 山东大学 A kind of eddy flow combined type SCR static mixer
CN113559705A (en) * 2021-08-05 2021-10-29 西安热工研究院有限公司 Drainage type SCR denitration urea direct injection system

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Granted publication date: 20130501