CN104785103B - A kind of ammonia spraying and mixing system device for SCR Flue Gas Denitrification Engineering - Google Patents
A kind of ammonia spraying and mixing system device for SCR Flue Gas Denitrification Engineering Download PDFInfo
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Abstract
A kind of ammonia spraying and mixing system device for SCR Flue Gas Denitrification Engineering, ammonia spraying and mixing system device is made up of array spray ammonia mixed cell, the quantity of spray ammonia mixed cell is determined by the section shape and size of flue position, ammonia spraying and mixing system device place, each spray ammonia mixed cell is arranged in flue symmetrically, and input pipe is connected by arm is vertical with the intermediate symmetry of communicate-type jet pipe；Input pipe is provided with valve on the path of the connection of arm；Described communicate-type jet pipe is the tubular structure of Guan Bi continuously, and which is provided with the through hole of flow of flue gas, and each through hole uniform vertical is symmetricly set on communicate-type jet pipe；Nozzle is arranged on the through hole on each communicate-type jet pipe；Nozzle includes spout, nozzle wall；Nozzle wall seals with the through hole of communicate-type jet pipe and welds and the sealing of nozzle wall top, and notch setting is on nozzle wall.
Description
Technical field
The present invention relates to a kind of spray ammonia for SCR (selective catalytic reduction) Flue Gas Denitrification Engineering device
Hybrid system device, belongs to denitration technical field of environment protection equipment.
Background technology
Along with the development of China's process of industrialization, problem of environmental pollution is the most serious.China local is not in recent years
Disconnected haze weather persistence occur, atmospheric pollution work normal to people and life cause serious shadow
Ring.Nitrogen oxides NOxIt is the key component of atmosphere pollution, is mainly derived from mobile emission source, as
Automobile, steamer and aircraft etc., fixed discharge source, such as station boiler, Industrial Boiler, biomass boiler etc..
The Treatment process in fixed discharge nitrogen oxides source mainly has desulphurization denitration one body technique, SCR technology, SNCR skill
Art and SNCR associating SCR technology etc..In these techniques, SCR technology is because its denitration efficiency is high, it is steady to run
Determine and become denitrating flue gas mainstream technology.
SCR technology i.e. selective catalytic reduction gas denitrifying technology, the ultimate principle of this technology is nitrogen oxides
NOxAgent (conventional NH it is reduced in the reactor being provided with catalyst3) it is reduced to N2And water.SCR reacts
Device is typically mounted on the downstream of economizer, or air preheater upstream, reducing agent NH3Generally at catalytic reactor
The flue of upstream is injected containing NO by ammonia spraying and mixing system devicexFlue gas.Ammonia spraying and mixing system device is main
Play the effect being uniformly injected into and making ammonia and flue gas to be sufficiently mixed of ammonia.Generally by ammonia spraying and mixing system
Device is divided into ammonia-spraying grid and static mixer two parts, and ammonia-spraying grid acts primarily as the effect uniformly spraying into ammonia,
Static mixer acts primarily as the effect strengthening turbulence intensity enhancing mixing intensity.It is main that current SCR engineering exists
One of problem is that the escaping of ammonia rate is high, and the main cause causing this problem is the spray ammonia mixed stocker currently used
Bulk cargo puts mixing intensity and mixing homogeneity is not enough.
The present invention is with the core technology in SCR denitration technology as object of study, for current SCR denitration engineering institute
The subject matter existed, by the innovative design to ammonia-spraying grid structure, the ammonia spraying and mixing system invented fills
Put and after removing static mixer, still can realize mixing intensity and the uniformity is better than original system.
Summary of the invention
The spray ammonia that the present invention seeks to invent a kind of high-effect low cost for the SCR technology of denitrating flue gas main flow mixes
Assembly system device, is simultaneously available for solving the problem that current SCR Flue Gas Denitrification Engineering the escaping of ammonia rate is high.
For achieving the above object, the technical solution used in the present invention is a kind of for SCR Flue Gas Denitrification Engineering
Ammonia spraying and mixing system device, as Figure 1-4, the ammonia spraying and mixing system device involved by the present invention is sprayed ammonia by array
Mixed cell forms, quantity the cutting by flue position, ammonia spraying and mixing system device place of spray ammonia mixed cell
Face shape and size determine, each spray ammonia mixed cell is arranged in flue symmetrically；Often the mixing of group spray ammonia is single
Unit includes input pipe 1, valve 2, arm 3, communicate-type jet pipe 4, nozzle 5；Specifically, input pipe 1
It is connected by arm 3 is vertical with the intermediate symmetry of communicate-type jet pipe 4；Input pipe 1 leads to the connection of arm 3
Valve 2 it is provided with on road；Described communicate-type jet pipe 4 is the tubular structure of Guan Bi continuously, and which is provided with flue gas
The through hole of flowing, each through hole uniform vertical is symmetricly set on communicate-type jet pipe 4；Nozzle 5 is arranged on each company
On through hole on flow-through jet pipe 4；Nozzle 5 includes spout 5-1, nozzle wall 5-2；Nozzle wall 5-2 with connect
The through hole of type jet pipe 3 seals welding and nozzle wall 5-2 top seals, and spout 5-1 is arranged on nozzle wall 5-2.
Ammonia spraying and mixing system device involved by the present invention spray ammonia mixed cell size and nozzle distribution distance by
Flue sectional dimension determines, the flow of spray ammonia mixed cell is controlled by the valve 2 on input pipe, can realize list
The boxed area of unit's ammonia spraying amount accurately controls.
The invention has the beneficial effects as follows: (1) spray each nozzle flow of ammonia mixed cell is uniform, sprays ammonia mixed cell
Being evenly arranged at flue, can strengthen the uniformity spraying into ammonia；(2) the spout axis of nozzle and flow of flue gas
Direction is vertical, can form higher turbulent flow, can strengthen the intensity that ammonia mixes with flue gas；(3) need not
Its upstream or downstream set static mixer again, reduce the crushing of ammonia spraying and mixing system, reduce energy loss, can
Reduce engineering cost, reduce the operating cost of system simultaneously.
Accompanying drawing explanation
Fig. 1 is ammonia spraying and mixing system structural representation.
Fig. 2 is spray ammonia mixed cell structural representation.
Fig. 3 is communicate-type nozzle structure schematic diagram.
Fig. 4 a is the front view of nozzle arrangements.
Fig. 4 b is the partial schematic sectional view of nozzle arrangements.
Fig. 5 is the structural representation of embodiment.
In figure: 1, input pipe, 2, valve, 3, arm, 4, communicate-type jet pipe, 5, nozzle, 5-1, spray
Mouthful, 5-2, nozzle wall.
Detailed description of the invention
Below in conjunction with figure, as a example by certain power plant 300MW unit SCR Flue Gas Denitrification Engineering device, to the present invention
It is described further.
As it is shown in figure 5, certain power plant 350MW unit SCR Flue Gas Denitrification Engineering device installs ammonia spraying and mixing system position
The cross section of the place's of putting flue is the rectangle of 2400 × 10200 (mm), according to the shape and size in flue cross section, enters
During the design of row ammonia spraying and mixing system, the spacing of nozzle is chosen as 425mm, arranges in length 10200mm direction
Six groups of spray ammonia mixed cells, arrange three groups of spray ammonia mixed cells in width 2400mm direction, and the mixing of spray ammonia is single altogether
18 groups of unit, nozzle sum is 144.Communicate-type jet pipe a size of Φ 76 × 3.5 (mm), each communicate-type
Arranging eight nozzles on jet pipe, the size of nozzle is Φ 26 × 2 (mm), and upper end of nozzle is closed, away from upper end 35mm
Place all around has the spout of four Φ 11mm in crosswise, and each adjacent ports is mutual along the centrage of nozzle
Vertically.
Ammonia spraying and mixing system device involved by the present invention with " Zhejiang University. coal-fired flue gas SCR denitration technology
Ammonia spraying and mixing system: China, 200910153847.2 [P] .2010-5-19. " and " Zhejiang University. one is used for
The V-type ammonia spraying and mixing system of SCR equipment for denitrifying flue gas: China, 201220161532.X [P] .2013-3-13. "
The difference of (hereinafter referred to as Zhejiang University's device) is: (1) Zhejiang University device is accomplished that single-point or two point control, when
When the ammonia that point injects reaches boxed area, the uniformity of ammonia will reduce, and the control area of point control is less,
Precision is relatively low, and the present invention is accomplished that boxed area control, and the big precision of control area is high；(2) present invention is not
Needing at its upstream or downstream sets static mixer again, the crushing of ammonia spraying and mixing system device is lower, and engineering becomes
This is lower, and operating cost is lower.
Ammonia spraying and mixing system device involved by the present invention with " Fujian Longjing Environment Protection Co., Ltd. a kind of SCR
Denitrating system and ammonia-gas spraying device thereof: China, 201420110317.6 [P] .2014-7-23. ", " middle electricity throw far reach ring
Protect the ammonia spraying and mixing system of Engineering Co., Ltd's .SCR equipment for denitrifying flue gas: China, 201120492447.7 [P].
2012-7-11. ", " China Datang Group Environmental Technologies Co., Ltd.. a kind of thermal power plant gametic fertility system
In ammonia, air mixer: China, CN203425725U [P] .2014-02-12. " and " world, Zhejiang
Ingegneria Ambientale SRL. rake is adjustable SCR denitration ammonia-gas spraying device: China, 201220387806.7 [P] .2013-
2-20. " difference of (hereinafter referred to as other devices) is: (1) according to fluid principles, owing to there is crushing on the way,
The flow of each nozzle of other devices is uneven, and the arm of the spray ammonia mixed cell of the present invention is the logical of circulation
Road, though still suffering from crushing on the way, but the pressure that can realize each nozzle reaches unanimity, the ammonia of each nozzle ejection
Flow tends to evenly；(2) nozzle of the spray ammonia mixed cell of the present invention has the function strengthening mixing intensity,
Entirely different with the nozzle of other devices；(3) the ammonia spraying and mixing system device of the present invention need not at its upstream
Or downstream sets static mixer again, the crushing of ammonia spraying and mixing system device is lower, and engineering cost is lower, runs
Expense is lower.
Claims (2)
1., for an ammonia spraying and mixing system device for SCR Flue Gas Denitrification Engineering, its feature exists
In: ammonia spraying and mixing system device is made up of array spray ammonia mixed cell, the number of spray ammonia mixed cell
Measure and determined by the section shape and size of flue position, ammonia spraying and mixing system device place, respectively spray
Ammonia mixed cell is arranged in flue symmetrically；Often group spray ammonia mixed cell includes input pipe
(1), valve (2), arm (3), communicate-type jet pipe (4), nozzle (5)；Specifically,
Input pipe (1) is connected by arm (3) is vertical with the intermediate symmetry of communicate-type jet pipe (4)；
Input pipe (1) is provided with valve (2) on the path of the connection of arm (3)；Described connection
Type jet pipe (4) is the tubular structure of Guan Bi continuously, and which is provided with the through hole of flow of flue gas,
Each through hole uniform vertical is symmetricly set on communicate-type jet pipe (4)；Nozzle (5) is arranged on respectively
On through hole on communicate-type jet pipe (4)；Nozzle (5) includes spout (5-1), nozzle wall (5-2)；
Nozzle wall (5-2) seals with the through hole of communicate-type jet pipe (4) and welds and nozzle wall (5-2) top
Portion seals, and spout (5-1) is arranged on nozzle wall (5-2).
A kind of spray ammonia for SCR Flue Gas Denitrification Engineering the most according to claim 1 mixes
System and device, it is characterised in that: the flow of spray ammonia mixed cell is by the valve (2) on input pipe
Controlling, the boxed area that can realize unit ammonia spraying amount accurately controls.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510145544.1A CN104785103B (en) | 2015-03-30 | 2015-03-30 | A kind of ammonia spraying and mixing system device for SCR Flue Gas Denitrification Engineering |
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| CN201510145544.1A CN104785103B (en) | 2015-03-30 | 2015-03-30 | A kind of ammonia spraying and mixing system device for SCR Flue Gas Denitrification Engineering |
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| CN104785103B true CN104785103B (en) | 2016-08-24 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105233686B (en) * | 2015-07-30 | 2018-10-30 | 北京哈泰克工程技术有限公司 | A kind of matrix form ammonia-spraying grid with mixing arrangement |
| CN106000053A (en) * | 2016-07-08 | 2016-10-12 | 大唐环境产业集团股份有限公司 | Combined ammonia injection grid device |
| CN106621785A (en) * | 2017-02-23 | 2017-05-10 | 东方电气集团东方锅炉股份有限公司 | Device and method for removing sulfur trioxide in boiler flue gas |
| CN106902660A (en) * | 2017-03-20 | 2017-06-30 | 北京清新环境技术股份有限公司 | A kind of ammonia jet mixing device for SCR Flue Gas Denitrification Engineerings |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5997822A (en) * | 1996-08-22 | 1999-12-07 | Hitachi Zosen Corporation | Ammonia injection device for use in exhaust gas denitration systems |
| CN102166472A (en) * | 2011-02-25 | 2011-08-31 | 中环（中国）工程有限公司 | Spiral-flow type ammonia spraying device used for selective catalytic reduction (SCR) denitrification system |
| CN103007701A (en) * | 2012-10-16 | 2013-04-03 | 西安热工研究院有限公司 | Petal ammonia injection grid for combining local vortex and overall vortex |
| CN103007750A (en) * | 2012-12-17 | 2013-04-03 | 浙江天地环保工程有限公司 | Ammonia spraying device for flue gas denitrification |
| EP2623181A1 (en) * | 2012-02-03 | 2013-08-07 | Alstom Technology Ltd | Arrangement for supplying a reducing agent in gaseous form into a flue gas |
-
2015
- 2015-03-30 CN CN201510145544.1A patent/CN104785103B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5997822A (en) * | 1996-08-22 | 1999-12-07 | Hitachi Zosen Corporation | Ammonia injection device for use in exhaust gas denitration systems |
| CN102166472A (en) * | 2011-02-25 | 2011-08-31 | 中环（中国）工程有限公司 | Spiral-flow type ammonia spraying device used for selective catalytic reduction (SCR) denitrification system |
| EP2623181A1 (en) * | 2012-02-03 | 2013-08-07 | Alstom Technology Ltd | Arrangement for supplying a reducing agent in gaseous form into a flue gas |
| CN103007701A (en) * | 2012-10-16 | 2013-04-03 | 西安热工研究院有限公司 | Petal ammonia injection grid for combining local vortex and overall vortex |
| CN103007750A (en) * | 2012-12-17 | 2013-04-03 | 浙江天地环保工程有限公司 | Ammonia spraying device for flue gas denitrification |
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