CN206027413U - W of thermal power plant type boiler SNCR deNOx systems - Google Patents
W of thermal power plant type boiler SNCR deNOx systems Download PDFInfo
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- CN206027413U CN206027413U CN201621054694.8U CN201621054694U CN206027413U CN 206027413 U CN206027413 U CN 206027413U CN 201621054694 U CN201621054694 U CN 201621054694U CN 206027413 U CN206027413 U CN 206027413U
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Abstract
The utility model relates to a W of thermal power plant type boiler SNCR deNOx systems, it rolls over a plurality of short spray gun that flame angle area divides the multilayer to set up including setting up the regional long spray gun at W type horizontal flue of the boiler at W type boiler to and laser detection system and metering modules who connects gradually and distribution module, the distribution module includes the long spray gun distribution module of the long spray gun of output connection and the short spray gun distribution module that short spray gun is connected to the output, former urea solution storage tank and demineralized water storage tank are connected respectively to the metering modules input that is used for controlling urea solution concentration, and long spray gun distribution module and short spray gun distribution module are connected respectively to the output, laser detection system including the central control cabinet, diode laser, fiber optic multiplexer, optic fibre and the multiunit laser instrument that connect gradually, the central control cabinet is used for detecting flue -gas temperature distribution signal and CO concentration signal through the laser instrument, long spray gun distribution module and metering modules are connected respectively through engineer station to its output.
Description
Technical field
This utility model is related to thermal power plant's SNCR denitration technology, specially a kind of thermal power plant W types boiler SNCR denitration system.
Background technology
W flame boiler in low volatile coal, with low-load combustion-stabilizing ability it is strong, combustion stability is good, band is negative
Lotus performance is strong, it is reliable the features such as, therefore W flame boiler become in China and used the low volatilization such as anthracite or meager coal inferior
Divide main force's type of furnace of coal, but which has that in actual motion NOx discharge is high.In the face of NOx emission concentration 50mg/
m3Ultra-clean emission request, simple transformation SCR denitration system not only invests higher with operating cost, while also affecting the peace of unit
Quan Xing.Consider from technology is many-sided with economic angle etc., increase SNCR denitration device on the basis of former SCR device is made full use of
It is the reasonable selection for realizing W type boiler nitrogen oxides minimum discharges.
SNCR method (SNCR) gas denitrifying technology be station boiler, fluidized-bed combustion boiler, cement kiln and
The mainstream technology of flue gas of refuse burning denitration.In 880 DEG C of -1050 DEG C of temperature ranges, under without catalysts conditions, ammonia is sprayed into
Or the amino reductive such as carbamide, the NOx in flue gas is optionally reduced into harmless nitrogen and water.SNCR techniques are with burner hearth
For reactor, can be realized by the transformation to boiler, the construction period is short, cost of investment and operating cost and other denitrating flue gas skills
It is all, than relatively low, to be suitable for the transformation to medium small boiler that art is compared.The controllable NOx emission of modern SNCR technologies reduces by 20～
50%, as unit capacity increases, size of burner hearth and unit load excursion expand, and increased reaction temperature window and reduction
The mixed uniformly control difficulty of agent, causes denitration efficiency to reduce.For 600MW units, 10 μ L/ are less than in control ammonia slip concentration
Under the conditions of L, denitration efficiency only 30% or so.It is universal higher due to using anthracitic W types boiler NOx initial concentrations, it is guarantor
Card NOx emission reaches 50mg/m3, the denitration efficiency of SNCR sections must reach more than 45%, therefore research and develop efficient thermoelectricity
Factory W type boiler SNCR denitration systems are extremely urgent.
The denitration efficiency of SNCR by temperature, CO concentration, NOx initial values, NSR, burning condition, coal, the type of furnace, the escaping of ammonia etc. because
The impact of element, wherein temperature and CO concentration is two major influence factors.For improving SNCR technique denitration efficiencies, correlational study is carried
Go out using the method for ammonia nitrogen ratio under control different load to adjust reduction agent flux, as disclosed in Chinese patent CN105169917A
A kind of SNCR-SCR combined denitration system and method for being detected based on ammonia nitrogen mol ratio and being regulated and controled, Chinese patent
A kind of SNCR SNCR response systems, Chinese patent disclosed in CN201520543068.4
The ammonia spraying amount control method of SNCR flue gas denitrification systems in a kind of manufacture of cement disclosed in CN201510188180.5, but this control
Method processed is extremely complex, it is difficult to realize in engineering.There is research to be distributed to control spray gun by reducing agent by measurement temperature in addition
It is injected in the temperature province of suitable SNCR reactions, realizes the dynamic tracking to each SNCR spray gun temperature window, such as China specially
A kind of point-to-point spraying systems of efficient SNCR disclosed in sharp CN104307347A, and for example disclosed in Chinese patent CN104117279A
A kind of station boiler SNCR denitration control system and its control method, the difficult point of the control method is that spray gun quantity is more, right
Every spray gun carries out precise control and will dramatically increase system cost.CO concentration in flue gas be affect SNCR denitration efficiency it is important because
Element, result of study show that, when CO concentration is less than 1000ppm, SNCR denitration efficiency increases with CO concentration and increases；When CO concentration
During more than 1000ppm, SNCR denitration efficiency increases with CO concentration and reduces.As CO concentration in flue gas is difficult to online survey
Amount, generally ignores the impact of CO concentration in current SNCR control systems, and this also becomes the important of restriction SNCR denitration efficiency
Reason.
Utility model content
For problems of the prior art, this utility model provides a kind of thermal power plant W types boiler SNCR denitration system,
Out of stock efficiency high, control are simple, and transformation is convenient.
This utility model is to be achieved through the following technical solutions：
A kind of thermal power plant W types boiler SNCR denitration system, including the long spray gun for being arranged on W type boiler horizontal gas passes region,
The multiple short spray gun that multilamellar is arranged in W type boiler furnace arch, furnace noses region point, and laser detection system and the metering mould being sequentially connected
Block and distribute module；Distribute module includes that outfan connects the long spray gun distribute module of long spray gun and outfan connects short spray gun
Short spray gun distribute module；Metering module input for controlling urea concentration connects crude urine element solution reservoir respectively and removes
Brine reservoir, outfan connect long spray gun distribute module and short spray gun distribute module respectively；Described laser detection system includes
Central control cabinet, diode laser, fibre multiplexer, optical fiber and the multigroup laser instrument being sequentially connected；Central control cabinet
For detecting flue-gas temperature distribution signal and CO concentration signals by laser instrument；Its outfan Jing engineer stations connect long spray respectively
Rifle distribute module and metering module；Uniformly in multi-tier arrangement on the cross section of horizontal flue, long spray gun divides multiple long spray guns
The urea liquid flow of each long lance ejection is controlled according to the control signal of engineer station respectively with module；Per layer short spray gun
Urea liquid entrance arrange an electrically operated valve, unit load and NSR value of the short spray gun distribute module according to W type boilers
The electrically operated valve aperture of per layer of control.
Preferably, long spray gun is provided with six altogether, and uniform in three layers of arrangement on the cross section of horizontal flue, long spray
Four groups of laser instrument are uniformly arranged on the section of rifle place；Laser instrument and long spray gun interval setting；Every group of laser instrument includes a transmitting
End and a receiving terminal, transmitting terminal connection optical fiber, receiving terminal connection central control cabinet.
Preferably, long spray gun cooling end entrance connects the outfan of desalination water storage tank, colling end outlet connection demineralized water storage
The input of tank.
Preferably, also including compressed air reservoir, the outfan of compressed air reservoir is respectively used to cooling air and is connected to
The cooling end entrance of short spray gun, is connected between metering module and distribute module for atomizing air.
Preferably, described metering module includes blender, and the control valve for being separately positioned on blender two entrances
And effusion meter；The outfan of crude urine element solution reservoir and desalination water storage tank is connected with corresponding mixer entrance by fluid filling pump respectively
Connect.
Preferably, one manually-operated gate is set per a short spray gun, all manually-operated gate apertures are consistent.
Compared with prior art, this utility model has following beneficial technique effect：
This utility model is stretched in the middle part of flue by the long spray gun for arranging, comprising multiple nozzles, the carbamide of long lance ejection
Solution can be completely covered flue cross section, it is ensured that urea liquid fully, is uniformly mixed with flue gas, improve denitration efficiency；Long spray gun is adopted
Cooled down with demineralized water, cooling water reusable edible, reduced operating cost.It is simultaneously multigroup sharp in long spray gun region arrangement
Photo-detector, while flue-gas temperature distribution and CO concentration is measured, and according to temperature distribution signal real-time adjustment per a long spray gun urine
Plain liquid inventory, according to CO concentration signal real-time adjustment desalination discharges, so as to ensure the denitrification reducing agent for spraying in optimal
Reaction condition, improves SNCR system denitration efficiencies.Short spray gun urea liquid flow adopts every layer of centralized Control, according to unit load
Range restraint puts into operation the number of plies and every layer of urea liquid total flow, and is evenly distributed to every spray gun, and control mode is simple, Yi Shi
It is existing.
Description of the drawings
Fig. 1 is W types boiler SNCR denitration system described in the utility model.
Fig. 2 is long gun controls loop in denitrating system described in the utility model.
In figure：Long spray gun 1, short spray gun 2, urea liquid storage tank 3, desalination water storage tank 4, metering module 6, blender 61, point
With module 7, long spray gun distribute module 71, central control cabinet 81, diode laser 82, fibre multiplexer 83, optical fiber 84,
Transmitting terminal 85, receiving terminal 86, engineer station 9, W types boiler 10.
Specific embodiment
This utility model is described in further detail with reference to specific embodiment, described is to this utility model
Explanation rather than restriction.
A kind of thermal power plant W types boiler SNCR denitration system of this utility model, as shown in figure 1, which includes being arranged on W type boilers
The long spray gun 1 in 10 horizontal flue regions, the multiple short spray gun 2 that multilamellar is arranged in 10 furnace arch, furnace nose region of W types boiler point, and laser
Detecting system and the metering module 6 being sequentially connected and distribute module 7；Distribute module 7 includes that outfan connects the long spray of long spray gun 1
Rifle distribute module 71 and outfan connect the short spray gun distribute module of short spray gun 2；For controlling the metering mould of urea concentration
6 input of block connects crude urine element solution reservoir 3 and desalination water storage tank 4 respectively, and outfan connects long spray gun distribute module 71 respectively
With short spray gun distribute module 72；Described laser detection system includes the central control cabinet 81, diode laser being sequentially connected
82nd, fibre multiplexer 83, optical fiber 84 and multigroup laser instrument；Central control cabinet 81 is for detecting flue-gas temperature by laser instrument
Distribution signal and CO concentration signals；Its outfan Jing engineer stations 9 connect long spray gun distribute module 71 and metering module 6 respectively；
Multiple long spray guns 1 are in uniformly multi-tier arrangement on the cross section of horizontal flue, and long spray gun distribute module 71 is according to engineer station 9
Control signal control the urea liquid flow of each long spray gun 1 injection respectively；The urea liquid pipeline of per layer short spray gun 2 enters
Mouth arranges an electrically operated valve, the electricity of unit load and NSR value control per layer of the short spray gun distribute module 72 according to W types boiler 10
Movable valve.Wherein, also including compressed air reservoir 5, the outfan of compressed air reservoir 5 be respectively used to cooling air be connected to it is short
The cooling end entrance of spray gun 2, is connected between metering module 6 and distribute module 7 for atomizing air.Central control cabinet 81 is used for
Detection and process laser signal；Fibre multiplexer 83 is used for the coupling of two wave band of laser signals；Diode laser 82
Generate laser signal；Optical fiber 84 transmits laser signal；Preferred laser detector is also included for purging and pneumatic decoking
Protection device.
In this preferred embodiment, as shown in Fig. 2 long spray gun 1 is provided with six altogether, and it is uniform on the cross section of horizontal flue
Arrange that long spray gun is uniformly arranged four groups of laser instrument on 1 place section in three layers；Laser instrument and 1 interval setting of long spray gun；Per group
Laser instrument includes a transmitting terminal 85 and a receiving terminal 86, and the connection optical fiber 84 of transmitting terminal 85, receiving terminal 86 connect central control
Cabinet 81.
In this preferred embodiment, the outfan of the cooling end entrance connection desalination of long spray gun 1 water storage tank 4, colling end outlet connection
The input of desalination water storage tank 4.Metering module 6 includes blender 61, and the control for being separately positioned on 61 two entrances of blender
Valve processed and effusion meter；The outfan of crude urine element solution reservoir 3 and desalination water storage tank 4 passes through fluid filling pump and corresponding blender respectively
61 entrances connect.
When a kind of thermal power plant W types boiler SNCR denitration system of this utility model is used, comprise the steps.Examined according to laser
The step of CO concentration signals that examining system is obtained adjust urea concentration by metering module 6；Obtained according to laser detection system
The step of temperature distribution signal for arriving adjusts the urea liquid flow of each injection of long spray gun 1 by long spray gun distribute module 71；
According to the step of unit load is interval and the short spray gun of NSR values control 2 the puts into operation number of plies and every layer of urea liquid total flow.Preferably,
2 points of two-layers of short spray gun are arranged on 10 furnace arch, furnace nose region of W types boiler, are the short spray gun of ground floor and the short spray of the second layer from the bottom up successively
Rifle.
Wherein, laser detection system obtains the CO concentration signals in horizontal flue, CO concentration letter using TDLAS measuring methods
Number valve opening signal all the way is converted in engineer station 9 and is sent in metering module 6, adjust the control of desalination water loop
The aperture of valve, so that control the urea concentration of the injection of long spray gun 1.
Wherein, laser detection system obtains the temperature distribution signal of flue gas in horizontal flue using TDLAS measuring methods, temperature
Degree distribution signal is converted into multi-way valve opening amount signal in engineer station 9 and sends in long spray gun distribute module 71, adjusts
Each long spray gun 1 controls the aperture of valve, so as to control per a urea liquid flow for the injection of long spray gun 1.
In this utility model, concrete arrangement and control are as follows.
1) as shown in figure 1, six long spray guns divide three layers and are arranged in W type boiler horizontal gas passes region, the injection urine in flue gas
Plain solution.Long spray gun stretches into flue center and comprising multiple spouts, and the urea liquid of injection can cover whole flue cross section.Long spray
Rifle adopts desalination water cooling, cooling water circulation utilization.
2) as shown in figure 1, branched short spray gun is arranged in W type boiler furnace arch, furnace noses region point two-layer, stretch at about 1 meter in stove and spray
Penetrate urea liquid.Short spray gun is cooled down using compressed air, and cooling air is directly blown in burner hearth.
3) as shown in Fig. 2 arranging four groups of laser instrument in long spray gun place section, every group of laser instrument comprising a transmitting terminal and
One receiving terminal.The laser beam of the specific wavelength sent by transmitting terminal is gathered through receiving end after boiler, in being then fed into
In the switch board of centre, the ratio of light and absorbed light line is not absorbed by central control cabinet measurement, so that it is determined that flue-gas temperature distribution
And CO concentration.Flue-gas temperature distribution signal is converted into six tunnel valve opening signals in engineer station and sends into long spray gun distribution
Module, adjusts the aperture of electrically operated valve in each long spray gun loop, so as to control the urea liquid flow per a long lance ejection.
CO concentration signals are converted into valve opening signal all the way in engineer station and send into metering module, adjust desalination water loop electricity
The aperture of movable valve, so as to control the urea concentration of long lance ejection, specially as CO concentration is raised, increases demineralized water
Flow；As CO concentration is reduced, reduce desalination discharge.
4) short spray gun urea liquid flow adopts every layer of centralized Control, is put into operation the number of plies and every according to unit load range restraint
Layer urea liquid total flow, and be evenly distributed to per a short spray gun.The urea liquid entrance of specially per layer short spray gun sets
One electrically operated valve, valve opening are adjusted according to unit load.When unit is underload, for example, fully loaded 50% is reached,
The short spray gun of the ground floor that puts into operation, the short spray gun of the second layer are closed, and adjust the aperture of ground floor valve according to NSR values；In unit is
During load, for example, fully loaded 75% is reached, while the short spray gun of the two-layer that puts into operation, and the aperture of two-layer valve is adjusted according to NSR values；
When unit is high load capacity, for example, fully loaded 100% is reached, the short spray gun of the second layer that puts into operation, the short spray gun of ground floor are closed, and root
The aperture of second layer valve is adjusted according to NSR values.One manually-operated gate is set per a short spray gun, all manually-operated gate apertures keep
Unanimously.
Wherein, laser detection system adopts TDLAS (Tunable Diode Laser Absorption
Spectroscopy, tunable diode laser can absorb spectrum) technology, collect two wavelength lasers in an optical fiber, then make
The light for sending sequentially passes through the horizontal flue section of W type boilers.Passed back central control cabinet after receptor collection light, by
Ratio the light quantity absorbed to the benchmark light quantity of the specific wavelength through boiler and measured matter molecule by centre switch board is entered
Row compares, so that it is determined that the concentration of each measurand, gas temperature is then according to two CO2The ratio of characteristic absorpting spectruming line is surveying
Amount.Emitter and receptor can be from dynamic(al) corrections, to guarantee also obtain optimal light quantity transmission when boiler is disturbed, while matching somebody with somebody
There are instrument air-blowing sweeping device and pneumatic coke removing appts, ensure the unimpeded of exploration hole.In this utility model, the two of horizontal flue
End is equipped with transmitting terminal 85 and receiving terminal 86, when laser is sent from side, after the receiving terminal 86 of corresponding end is received, in horizontal flue
One measuring route of middle formation, these paths can measure CO concentration and fire box temperature in burner hearth simultaneously.
The principle of TDLAS measurements is that gas molecule has an Absorption to the light of characteristic frequency (wavelength), absorbance with
Temperature, pressure, path are related to gas concentration.For a known path and gas pressure, by collecting simultaneously
Analysis absorbance of the laser in a characteristic absorption frequency range, it may be determined that the temperature of flue gas and concentration of component.
Claims (6)
1. a kind of thermal power plant W types boiler SNCR denitration system, it is characterised in that including being arranged on W type boiler (10) horizontal flues
The long spray gun (1) in region, the multiple short spray gun (2) that multilamellar is arranged in W type boiler (10) furnace arch, furnace nose regions point, and laser detection
System and the metering module (6) being sequentially connected and distribute module (7)；
Distribute module (7) includes that outfan connects long spray gun distribute module (71) of long spray gun (1) and outfan connects short spray gun
(2) short spray gun distribute module；
Metering module (6) input for controlling urea concentration connects crude urine element solution reservoir (3) and demineralized water respectively
Storage tank (4), outfan connect long spray gun distribute module (71) and short spray gun distribute module respectively；
Central control cabinet (81) that described laser detection system includes being sequentially connected, diode laser (82), fiber optic
Multiplexer (83), optical fiber (84) and multigroup laser instrument；Central control cabinet (81) is used for detecting flue-gas temperature distribution by laser instrument
Signal and CO concentration signals；Its outfan Jing engineer stations (9) connects long spray gun distribute module (71) and metering module respectively
(6)；
Multiple long spray gun (1) is uniform in multi-tier arrangement on the cross section of horizontal flue, long spray gun distribute module (71) basis
The control signal of engineer station (9) controls the urea liquid flow that each long spray gun (1) sprays respectively；Per layer short spray gun (2)
Urea liquid entrance one electrically operated valve is set, short spray gun distribute module (72) are negative according to the unit of W type boilers (10)
Lotus and NSR values control per layer of electrically operated valve aperture.
2. a kind of thermal power plant W types boiler SNCR denitration system according to claim 1, it is characterised in that long spray gun (1) altogether
Six are provided with, and it is uniform in three layers of arrangement on the cross section of horizontal flue, it is uniformly arranged on long spray gun (1) place section
Four groups of laser instrument；Laser instrument and long spray gun (1) interval setting；Every group of laser instrument includes a transmitting terminal (85) and a receiving terminal
(86), transmitting terminal (85) connection optical fiber (84), receiving terminal (86) connection central control cabinet (81).
3. a kind of thermal power plant W types boiler SNCR denitration system according to claim 1, it is characterised in that long spray gun (1) is cold
But end entrance connects the outfan of desalination water storage tank (4), the input of colling end outlet connection desalination water storage tank (4).
4. a kind of thermal power plant W types boiler SNCR denitration system according to claim 1, it is characterised in that also including compression
Air reservoir (5), the outfan of compressed air reservoir (5) are respectively used to cooling air and are connected to the colling end of short spray gun (2) enter
Mouthful, it is connected between metering module (6) and distribute module (7) for atomizing air.
5. a kind of thermal power plant W types boiler SNCR denitration system according to claim 1, it is characterised in that described metering
Module (6) includes blender (61), and the control valve and effusion meter for being separately positioned on blender (61) two entrances；Crude urine element
The outfan of solution reservoir (3) and desalination water storage tank (4) is connected with corresponding blender (61) entrance by fluid filling pump respectively.
6. a kind of thermal power plant W types boiler SNCR denitration system according to claim 1, it is characterised in that per a short spray gun
(2) manually-operated gate is set, and all manually-operated gate apertures are consistent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621054694.8U CN206027413U (en) | 2016-09-13 | 2016-09-13 | W of thermal power plant type boiler SNCR deNOx systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621054694.8U CN206027413U (en) | 2016-09-13 | 2016-09-13 | W of thermal power plant type boiler SNCR deNOx systems |
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| Publication Number | Publication Date |
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| CN206027413U true CN206027413U (en) | 2017-03-22 |
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| CN201621054694.8U Expired - Fee Related CN206027413U (en) | 2016-09-13 | 2016-09-13 | W of thermal power plant type boiler SNCR deNOx systems |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107543148A (en) * | 2017-09-12 | 2018-01-05 | 哈尔滨工业大学 | Porous ammonia-gas spraying device for W flame boiler high temperature reducing zone |
| CN107559858A (en) * | 2017-09-12 | 2018-01-09 | 哈尔滨工业大学 | Turbulent burner W flame boiler with interior straight outward turning ammonia-gas spraying device |
| CN108786424A (en) * | 2018-08-10 | 2018-11-13 | 成都中核鑫星应用技术研究所 | A kind of purifier of vapour/exhaust gas from diesel vehicle NOx, HC, CO and solid particle |
| CN110975582A (en) * | 2020-03-03 | 2020-04-10 | 山东中航天业科技有限公司 | Flue gas desulfurization, denitrification and dust removal system of biomass circulating fluidized bed boiler |
| CN115624847A (en) * | 2022-12-16 | 2023-01-20 | 河北省建筑材料工业设计研究院有限公司 | Accurate denitration control system of cement kiln self-adaptation |
-
2016
- 2016-09-13 CN CN201621054694.8U patent/CN206027413U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107543148A (en) * | 2017-09-12 | 2018-01-05 | 哈尔滨工业大学 | Porous ammonia-gas spraying device for W flame boiler high temperature reducing zone |
| CN107559858A (en) * | 2017-09-12 | 2018-01-09 | 哈尔滨工业大学 | Turbulent burner W flame boiler with interior straight outward turning ammonia-gas spraying device |
| CN107543148B (en) * | 2017-09-12 | 2019-01-22 | 哈尔滨工业大学 | Porous ammonia-gas spraying device for W flame boiler high temperature reducing zone |
| CN108786424A (en) * | 2018-08-10 | 2018-11-13 | 成都中核鑫星应用技术研究所 | A kind of purifier of vapour/exhaust gas from diesel vehicle NOx, HC, CO and solid particle |
| CN110975582A (en) * | 2020-03-03 | 2020-04-10 | 山东中航天业科技有限公司 | Flue gas desulfurization, denitrification and dust removal system of biomass circulating fluidized bed boiler |
| CN115624847A (en) * | 2022-12-16 | 2023-01-20 | 河北省建筑材料工业设计研究院有限公司 | Accurate denitration control system of cement kiln self-adaptation |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170322 Termination date: 20170913 |