CN107185367A - SNCR metered dispensing units and method that concentration based on ammonia is quantitatively coupled - Google Patents
SNCR metered dispensing units and method that concentration based on ammonia is quantitatively coupled Download PDFInfo
- Publication number
- CN107185367A CN107185367A CN201710433206.7A CN201710433206A CN107185367A CN 107185367 A CN107185367 A CN 107185367A CN 201710433206 A CN201710433206 A CN 201710433206A CN 107185367 A CN107185367 A CN 107185367A
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- ammoniacal liquor
- dilution water
- module
- flow
- denitration
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 13
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 155
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 127
- 239000012895 dilution Substances 0.000 claims abstract description 120
- 238000010790 dilution Methods 0.000 claims abstract description 120
- 239000007921 spray Substances 0.000 claims abstract description 21
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 23
- 239000000908 ammonium hydroxide Substances 0.000 claims description 21
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 18
- 230000033228 biological regulation Effects 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 10
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 claims description 9
- 238000012546 transfer Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 14
- 238000002347 injection Methods 0.000 abstract description 8
- 239000007924 injection Substances 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000007865 diluting Methods 0.000 description 3
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009123 feedback regulation Effects 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/346—Controlling the process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
- B01F23/405—Methods of mixing liquids with liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
- B01F23/48—Mixing liquids with liquids; Emulsifying characterised by the nature of the liquids
- B01F23/483—Mixing liquids with liquids; Emulsifying characterised by the nature of the liquids using water for diluting a liquid ingredient, obtaining a predetermined concentration or making an aqueous solution of a concentrate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/22—Control or regulation
- B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
- B01F35/2211—Amount of delivered fluid during a period
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/22—Control or regulation
- B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
- B01F35/2213—Pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/48—Mixing water in water-taps with other ingredients, e.g. air, detergents or disinfectants
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention discloses SNCR metered dispensing units and the method that a kind of concentration based on ammonia is quantitatively coupled, described device includes ammoniacal liquor conveyor module, dilution water conveyor module and metering distribute module, and it is provided with backfeed loop in ammoniacal liquor conveyor module and dilution water conveyor module, with ensure after and before the valve pressure stability there is provided stable operating condition；The controlled quentity controlled variable of methods described is the concentration of ammonia, that is, ensures that injection total flow is constant, only change the concentration of injection ammoniacal liquor.The present invention is by controlling ammoniacal liquor and dilution water total flow constant, ensure that spray gun works under declared working condition all the time, and denitrification apparatus is normally and efficiently run in the case of underload, effectively reduce cost, improve denitration efficiency, and can adapt to all operating modes and ensure denitration efficiency, controling power is strong, easy to operate.
Description
Technical field
The SNCR metered dispensing units and method quantitatively coupled the present invention relates to a kind of concentration based on ammonia.
Background technology
In existing SNCR denitration, it is stored in frequently with 20% ammoniacal liquor or 50% urea as denitrfying agent in storage tank, but it is actual
In use, generally requiring denitrfying agent concentration dilution to less than 10%, flue is then sprayed into by spray gun and carries out denitration, for dense
For spending 20% ammoniacal liquor as denitrfying agent, ammoniacal liquor and dilution water are conveyed by pump respectively, pass through Pipeline transport to spray gun after mixing
Injection, this design method ammonia concn remains at 10%, and sprays into the amount of ammoniacal liquor to fit by Flux Valve Control
Answer the change of boiler load.
It can be seen that, existing SNCR denitration is designed by boiler EIAJ, by controlling the amount of 10% concentration ammoniacal liquor to adapt to
The change of boiler load, when boiler load is reduced, the amount for spraying into ammoniacal liquor is decreased.But in actual use, spray gun
Declared working condition be certain, and boiler, when being worked in the case of underload, ammoniacal liquor usage amount is small, and spray gun can not be in declared working condition
Operated within range, the spray regime and atomization ability of spray gun are difficult to be guaranteed, and cause poor, the escaping of ammonia height of denitration effect etc. to lack
Fall into.
The content of the invention
The technical problems to be solved by the invention are for drawbacks described above present in prior art, propose that one kind is based on
SNCR metered dispensing units and method that the concentration of ammonia is quantitatively coupled, by adjusting ammonia concn, make spray gun all the time in volume
Determine work in condition range, it is ensured that denitrification apparatus normal, Effec-tive Function in the case of underload.
The present invention is realized using following technical scheme：
The SNCR metered dispensing units that concentration based on ammonia is quantitatively coupled, including control module, ammoniacal liquor conveyor module
With dilution water conveyor module, the output end of the ammoniacal liquor conveyor module and dilution water conveyor module is also associated with and control module phase
Metering distribute module even, the metering distribute module is connected by a jet module with spray gun；The ammoniacal liquor conveyor module bag
Include and be provided with pressure-regulating valve I on ammoniacal liquor transfer pipeline, ammonium hydroxide delivery pump and ammoniacal liquor backfeed loop, the ammoniacal liquor backfeed loop；
Institute's dilution water conveyor module includes dilution water transfer pipeline, dilution water delivery pump and dilution water backfeed loop, and the dilution water is anti-
It is fed back on road and is provided with pressure-regulating valve II, and ammonium hydroxide delivery pump and dilution water delivery pump are connected with control module；By defeated
Send module that backfeed loop is set, it is ensured that the discharge pressure of transfer pipeline outlet is constant, the determination of discharge pressure is also metering distribution
The premise guarantee of flow control valve accurate adjustment in module；
The metering distribute module includes the ammoniacal liquor flowmeter and ammoniacal liquor flow control valve being connected with ammoniacal liquor conveyor module, with
And the dilution water flow gauge and dilution water flow adjustable valve being connected with dilution water conveyor module, by being set in metering distribute module
Flowmeter and flow control valve, it is ensured that control module by the feedback regulation flow control valve of flowmeter, and then control ammoniacal liquor and
The uninterrupted of dilution water, and keep the total flow of ammoniacal liquor and dilution water constant, in addition, described device is also including de- to monitor
The detection module of nitrous oxides concentration after nitre, the detection module is connected with control module.
Further, the ammonium hydroxide delivery pump includes two ammonium hydroxide delivery pump A in parallel and ammonium hydroxide delivery pump B, and one for one
With, it is ensured that plant running stability, and ammonium hydroxide delivery pump A and ammonium hydroxide delivery pump B metered flow for needed for denitration ammoniacal liquor flow
More than 5 times.
Further, the dilution water delivery pump includes two dilution water delivery pump A in parallel and dilution water delivery pump B,
And dilution water delivery pump A and dilution water delivery pump B metered flow are more than 5 times of ammoniacal liquor flow for needed for denitration.
Further, the ammoniacal liquor flow control valve and dilution water flow adjustable valve use Linear flow control valve, protect
The aperture of card valve is directly proportional to flow, accurately adjusts flow, flow control valve can pass through control module remote control.
Further, the selection standard of the ammoniacal liquor flow control valve is：Ammoniacal liquor flow needed for denitration is adjusted in ammoniacal liquor flow
In the 30%-70% for saving valve regulation scope, to improve survey degree of regulation, for diluting water regulating valve, type selecting standard is one
Sample.
Further, in addition to jet module input atomizing air intake line and the cooling air input being connected
Pipeline, the jet module also includes also including being arranged on flowmeter on every branch road, the atomizing air intake line with
And be respectively arranged with pressure-regulating valve III and pressure-regulating valve IV on cooling air intake line, after ammoniacal liquor and dilution water mixing with
Mixing air inputs jet module jointly, is then gone out by lance ejection.
A kind of of the invention SNCR for also proposing that concentration based on ammonia is quantitatively coupled in addition measures distribution method, including with
Lower step：
Step 1, the nitrous oxides concentration after current denitration is monitored by detection module, and transmitted to control module；Control
Module judges current nitrous oxides concentration value whether in denitration claimed range, if in denitration claimed range, according to current
State is continued to run with；If higher than denitration claimed range maximum, performing step S2；If less than denitration claimed range minimum value,
Then perform step S3；；
Step S2, by control module control, gradually increase ammoniacal liquor flow control valve aperture, to increase ammoniacal liquor flow, and
Pass through ammoniacal liquor flowmeter Real-time Feedback ammoniacal liquor flow；Meanwhile, by control module control, gradually reduce dilution water flow adjustable valve
Aperture, by dilution water flow gauge Real-time Feedback dilution water flow, and is modified；
Ammoniacal liquor flow and dilution water flow total amount is controlled to keep constant by control module, it is dilute when ammoniacal liquor flow increases
Release water-carrying capacity reduction, it is ensured that injection total amount is constant, only change ammonia concn, until the concentration of the nitrogen oxides obtained after denitration reaches
To denitration required value, stop regulation ammoniacal liquor flow control valve；
Step S3, by control module control, be gradually reduced ammoniacal liquor flow control valve aperture, and it is real to pass through ammoniacal liquor flowmeter
When feed back ammoniacal liquor flow；Meanwhile, by control module control, gradually increase dilution water flow adjustable valve aperture, pass through dilution water
Flowmeter Real-time Feedback flow is modified；Ammoniacal liquor flow and dilution water flow total amount is controlled to keep constant by control module,
Until the concentration of the nitrogen oxides obtained after denitration reaches denitration claimed range, stop regulation ammoniacal liquor flow control valve；
Step S4, while step S2 and step S3 are carried out, pressure-regulating valve I and pressure-regulating valve II to keep in real time
Ammoniacal liquor backfeed loop and dilution water reaction circuit pressures are stable, and then ensure ammoniacal liquor conveyor module and the outlet of dilution water conveyor module
Pressure is constant.
Further, the ammoniacal liquor flow control valve and dilution water flow adjustable valve use Linear flow control valve, protect
The aperture of card valve is directly proportional to flow, accurately adjusts flow, flow control valve can pass through control module remote control.
Compared with prior art, advantages and positive effects of the present invention are：
Metered dispensing unit proposed by the present invention, including ammoniacal liquor conveyor module, dilution water conveyor module, storage tank and metering
Distribute module, and backfeed loop is provided with ammoniacal liquor conveyor module and dilution water conveyor module, by ensureing upstream pressure, it is
Regulating valve provides the working effect of stable operating condition, preferably protection ammoniacal liquor regulating valve and diluting water regulating valve；The side
The controlled quentity controlled variable of method is ammonia concn, that is, ensures that injection total flow is constant, only change the concentration of injection ammoniacal liquor, compared to existing denitration
Present situation controlled quentity controlled variable is ammonia vol, that is, ensures that ammonia concn is constant, and for the emitted dose for only changing ammoniacal liquor, the present invention is by controlling ammonia
Water and dilution water total flow are constant, it is ensured that spray gun works under declared working condition all the time, and denitrification apparatus is in the case of underload
Normally and efficiently run, effectively reduce cost, improve denitration efficiency, and can adapt to all operating modes and ensure denitration efficiency, control
Power is strong, easy to operate.
Brief description of the drawings
Fig. 1 is metered dispensing unit theory diagram described in the embodiment of the present invention 1；
Fig. 2 is ammoniacal liquor conveyor module structural representation described in the embodiment of the present invention 1；
Fig. 3 is dilution water conveyor module structural representation described in the embodiment of the present invention 1；
Fig. 4 is that distribute module structural representation is measured described in the embodiment of the present invention 1；
Fig. 5 is jet module structural representation described in the embodiment of the present invention 1；
Fig. 6 is spray gun connection diagram described in the embodiment of the present invention 1.
Embodiment
In order to be more clearly understood from the above objects, features and advantages of the present invention, below in conjunction with the accompanying drawings and implement
The present invention will be further described for example, and the present embodiment is introduced using ammoniacal liquor as denitrfying agent, certainly, and using urea etc., other take off
Nitre agent is similar using principle, on the premise of design philosophy of the present invention is not departed from, within the scope of the present invention.
Embodiment 1, the SNCR metered dispensing units that the concentration based on ammonia is quantitatively coupled are stored up with reference to Fig. 1, including ammoniacal liquor
Tank, dilution water storage tank, control module (not illustrating in figure), ammoniacal liquor conveyor module and dilution water conveyor module, the ammoniacal liquor conveying
Module and the output end of dilution water conveyor module are also associated with the metering distribute module being connected with control module, the metering distribution
Module is connected by a jet module with spray gun；The ammoniacal liquor conveyor module includes ammoniacal liquor transfer pipeline, ammonium hydroxide delivery pump and ammonia
Pressure-regulating valve I is provided with water backfeed loop, the ammoniacal liquor backfeed loop；Institute's dilution water conveyor module is conveyed including dilution water
Pressure-regulating valve II, and ammonia are provided with pipeline, dilution water delivery pump and dilution water backfeed loop, the dilution water backfeed loop
Water delivery pump and dilution water delivery pump are connected with control module,
The metering distribute module includes the ammoniacal liquor flowmeter and ammoniacal liquor flow control valve being connected with ammoniacal liquor conveyor module, with
And the dilution water flow gauge and dilution water flow adjustable valve being connected with dilution water conveyor module, by being set in metering distribute module
Flowmeter and flow control valve, it is ensured that control module by the feedback regulation flow control valve of flowmeter, and then control ammoniacal liquor and
The uninterrupted of dilution water, and keep the total flow of ammoniacal liquor and dilution water constant, in addition, described device is also including de- to monitor
The detection module (not illustrating in figure) of nitrous oxides concentration after nitre, the detection module is connected with control module.
Control module described in the present embodiment is used in the commonly used DCS control systems in denitration field, the detection mould
Block is also the equipment of comparative maturity, such as flue gas monitoring system etc., is not detailed herein, and ammoniacal liquor is passed through ammonia by ammoniacal liquor conveyor module
Water delivery pump is delivered to metering distribute module, and the dilution water conveyed with dilution water conveyor module is uniformly mixed, and is then sent to spray
Module is penetrated, and the flowmeter of convenient observation present flow rate is provided with the injection branch road of jet module, it is equal by jet module
Even distribution sprays into denitration position to each spray gun after being atomized by atomizing air.
To ensure that metering distribute module regulating valve is accurately controlled, with the change of adaptive system control mode, it is necessary to ensure to adjust
Save before the valve of valve and downstream pressure stablizes constant, to reach this purpose, the determination by discharge pressure is also metering distribution mould
The premise guarantee of ammoniacal liquor flow control valve and dilution water flow adjustable valve accurate adjustment on block, in ammoniacal liquor conveyor module and dilution water
Conveyor module sets ammoniacal liquor and dilution water backfeed loop, and sets pressure-regulating valve I and pressure-regulating valve II in backfeed loop, protects
Demonstrate,prove conveyor module outlet pressure stable.
Also, to ensure plant running stability, the ammonium hydroxide delivery pump includes two ammonium hydroxide delivery pump A and ammonia in parallel
Water delivery pump B, dilution water delivery pump include two dilution water delivery pump A in parallel and dilution water delivery pump B, a preparation and a use, by
Exceeding certain pressure in pressure-regulating valve I and pressure-regulating valve II can just open, in ammoniacal liquor conveyor module, a part of ammoniacal liquor to
Preceding conveying, another part is returned in tank used for storing ammonia by backfeed loop, therefore in order to ensure that outlet pressure is constant, aforementioned four conveying
The selection of the metered flow of pump (dilution water delivery pump A, dilution water delivery pump B, ammonium hydroxide delivery pump A and ammonium hydroxide delivery pump B) is long-range
In denitration ammoniacal liquor, dilution water consumption, such as more than 5 times of ammoniacal liquor flow or dilution water flow for needed for denitration, the present embodiment is excellent
Select 8 times.
By the design of backfeed loop and delivery pump, the flow of delivery pump output is mainly flowed back in storage tank by loop, few
Measuring flow is used for denitrating system, therefore, needed for denitration during changes in flow rate, amount of the amount much smaller than backflow of change, therefore, by flow
(flow control valve) pressure change is minimized after and before the valve caused by change, meanwhile, the pressure-regulating valve pair on backfeed loop
Transfer pipeline is adjusted in real time, stable with downstream pressure before dual guarantee flow control valve valve.
In addition, with the operation of SNCR denitration system, along with the change of boiler load, denitration ammonia vol and dilution water
Amount need to be adjusted therewith, in order to ensure the Effec-tive Function of denitrating system, ammoniacal liquor, dilute water regulation must quickly, accurate, and ammonia
Water, the regulation of dilution water rely primarily on flow control valve, because the design and control of flow control valve are particularly important, to protect
The aperture for demonstrate,proving valve (flow control valve) is proportional with flow, accurately adjusts flow, the ammoniacal liquor flow control valve with
Dilution water flow adjustable valve using Linear flow control valve (linear characteristic refers to relative travel and relative discharge is in line relation,
Changes in flow rate caused by the change of per stroke is constant, when flow is big, and flow is small with respect to value changes, flow hour, then
Flow is big with respect to value changes), and flow control valve can pass through control module remote control；The the most accurate of flow control valve is adjusted
Adjusting range is in the 30%-70% of its adjustable range, as in the 30%-70% apertures of linear valve, so institute in the present embodiment
The selection standard for stating ammoniacal liquor flow control valve is：30%- of the ammoniacal liquor flow in ammoniacal liquor flow control valve adjustable range needed for denitration
In 70%, for diluting water regulating valve, type selecting standard is identical, if being 30kg/h- than the ammoniacal liquor flow used
70kg/h, then the adjustable range of flowmeter chooses 0kg/h -100kg/h, by above-mentioned Curve guide impeller, in ammoniacal liquor, dilution water
Amount control on, realize in real time, be accurately controlled, provide important leverage for efficient, the stable operation of denitrating system.
The present embodiment also includes the atomizing air intake line being connected with jet module input and cooling air input
Pressure-regulating valve III is respectively arranged with pipeline, the atomizing air intake line and cooling air intake line and pressure is adjusted
Valve IV is saved, jet module is inputted jointly with mixing air after ammoniacal liquor and dilution water mixing, is then gone out by lance ejection.
Each module annexation schematic diagram of the present embodiment described device is with reference to Fig. 2-Fig. 6, and Fig. 2 is ammoniacal liquor conveyor module knot
Structure schematic diagram, wherein, 10 be ammonia inlet, and 11 be ammoniacal liquor refluxing opening, is connected with tank used for storing ammonia, and 12 be ammoniacal liquor outlet, with meter
The ammonia inlet 31 for measuring distribute module is connected, and 13 and 14 be respectively ammonium hydroxide delivery pump B and ammonium hydroxide delivery pump A, and 15 be that pressure is adjusted
Valve I；Fig. 3 is dilution water conveyor module schematic diagram, wherein, 20 be dilution water inlet, and 21 be dilution water refluxing opening, and dilution water
Storage tank is connected, and 22 be dilution water out, is connected with the dilution water inlet 32 for measuring distribute module, and 23 and 24 be respectively dilution water
Delivery pump B and dilution water delivery pump A, 25 be pressure-regulating valve II；Metering distribute module described in Fig. 4,33 and 34 be respectively mist
Change air intake and cooling air intake, 35 and 36 be respectively atomizing air outlet and cooling air outlet, with the mist shown in Fig. 5
Change air intake 42 with cooling air intake 43 to be connected；37 and 38 be respectively ammoniacal liquor flowmeter and ammoniacal liquor flow control valve, 39 Hes
40 be respectively dilution water flow gauge and dilution water flow adjustable valve；30 be ammoniacal liquor and the outlet of dilution water mixed solution, and shown in Fig. 5
Ammoniacal liquor mixed solution entrance 41 be connected；Fig. 6 be spray gun connection diagram, wherein, 53 with jet module cooling air interface
46 are connected, and 52 are connected with the part of jet module ammoniacal liquor interface 44, and 51 are connected with jet module compressed air interface 45.
Embodiment 2, the device according to embodiment 1, the present embodiment proposes that a kind of concentration based on ammonia carries out quantitative coupling
The SNCR metering distribution methods of conjunction, comprise the following steps：
Step 1, the nitrous oxides concentration after current denitration is monitored by detection module, and transmitted to control module；Control
Module judges current nitrous oxides concentration value whether in denitration claimed range, if in denitration claimed range, according to current
State is continued to run with；If higher than denitration claimed range maximum, performing step S2；If less than denitration claimed range minimum value,
Then perform step S3；
Step S2, by control module control, gradually increase ammoniacal liquor flow control valve aperture, the ammoniacal liquor flow control valve
For linear valve, aperture is directly proportional to flow, to increase ammoniacal liquor flow, and passes through ammoniacal liquor flowmeter Real-time Feedback ammoniacal liquor flow；
Meanwhile, by control module control, dilution water flow adjustable valve aperture is gradually reduced, it is real by dilution water flow gauge
When feed back dilution water flow, and be modified；
Ammoniacal liquor flow and dilution water flow total amount is controlled to keep constant by control module, it is dilute when ammoniacal liquor flow increases
Release water-carrying capacity reduction, it is ensured that injection total amount is constant, only change ammonia concn, until the concentration of the nitrogen oxides obtained after denitration reaches
To denitration required value, stop regulation ammoniacal liquor flow control valve；
Step S3, by control module control, be gradually reduced ammoniacal liquor flow control valve aperture, and it is real to pass through ammoniacal liquor flowmeter
When feed back ammoniacal liquor flow；Meanwhile, by control module control, gradually increase dilution water flow adjustable valve aperture, pass through dilution water
Flowmeter Real-time Feedback flow is modified；Ammoniacal liquor flow and dilution water flow total amount is controlled to keep constant by control module,
Until the concentration of the nitrogen oxides obtained after denitration reaches denitration claimed range, stop regulation ammoniacal liquor flow control valve；
Step S3, while step S1-S3 is carried out, regulation ammoniacal liquor is anti-in real time for pressure-regulating valve I and pressure-regulating valve II
The pressure of road and dilution water backfeed loop is fed back to, keeps ammoniacal liquor backfeed loop and dilution water reaction circuit pressures stable, Jin Erbao
Demonstrate,prove ammoniacal liquor conveyor module and dilution water conveyor module outlet pressure is constant.
The present embodiment is in implementation process, and (technical protocol basic data) as needed is calculated under full load situation first
20% ammonia volume needed for denitration, if than ammonia volume needed for denitration be 150Kg/h, in order to ensure ammonia concn 10% with
Under, then dilution water is similarly 150Kg/h, it is assumed that spray gun is 6, then every spray gun declared working condition is 50Kg/h, to ensure spray gun
All the time worked in declared working condition, when ammoniacal liquor flow changes between 0Kg/h -150Kg/h, dilution water flow is in 300Kg/h-
Changed between 150Kg/h, control ammoniacal liquor and dilution water total flow to remain 300Kg/h, metering distribution by control module
The selection of pump, instrument, flow control valve etc. is all taken this as a foundation in module, conveyor module, is not detailed herein.
The above described is only a preferred embodiment of the present invention, being not the limitation for making other forms to the present invention, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
Imitate embodiment and be applied to other fields, but every without departing from technical solution of the present invention content, the technical spirit according to the present invention
Any simple modification, equivalent variations and the remodeling made to above example, still fall within the protection domain of technical solution of the present invention.
Claims (8)
1. the SNCR metered dispensing units that the concentration based on ammonia is quantitatively coupled, including control module, ammoniacal liquor conveyor module and
Dilution water conveyor module, it is characterised in that the output end of the ammoniacal liquor conveyor module and dilution water conveyor module be also associated with
The connected metering distribute module of control module, the metering distribute module is connected by a jet module with spray gun；
The ammoniacal liquor conveyor module includes ammoniacal liquor transfer pipeline, ammonium hydroxide delivery pump and ammoniacal liquor backfeed loop, and the ammoniacal liquor is fed back to
Pressure-regulating valve I is provided with road；Institute's dilution water conveyor module includes dilution water transfer pipeline, dilution water delivery pump and dilution water
Be provided with pressure-regulating valve II on backfeed loop, the dilution water backfeed loop, and ammonium hydroxide delivery pump and dilution water delivery pump with
Control module is connected；
The metering distribute module includes the ammoniacal liquor flowmeter and ammoniacal liquor flow control valve being connected with ammoniacal liquor conveyor module, Yi Jiyu
Dilution water conveyor module connected dilution water flow gauge and dilution water flow adjustable valve；
Also include the detection module to monitor nitrous oxides concentration after denitration, the detection module is connected with control module.
2. metered dispensing unit according to claim 1, it is characterised in that：The ammonium hydroxide delivery pump include two it is in parallel
Ammonium hydroxide delivery pump A and ammonium hydroxide delivery pump B, and ammonium hydroxide delivery pump A and ammonium hydroxide delivery pump B metered flow for needed for denitration ammonia aqua stream
More than 5 times of amount.
3. metered dispensing unit according to claim 1, it is characterised in that：The dilution water delivery pump includes two parallel connections
Dilution water delivery pump A and dilution water delivery pump B, and dilution water delivery pump A and dilution water delivery pump B metered flow be denitration
More than 5 times of required ammoniacal liquor flow.
4. metered dispensing unit according to claim 1, it is characterised in that：The ammoniacal liquor flow control valve and dilution water flow
Adjustable valve uses Linear flow control valve.
5. metered dispensing unit according to claim 1, it is characterised in that：The selection standard of the ammoniacal liquor flow control valve
For：Ammoniacal liquor flow is in the 30%-70% of ammoniacal liquor flow control valve adjustable range needed for denitration.
6. metered dispensing unit according to claim 1, it is characterised in that：Also include what is be connected with jet module input
Atomizing air intake line and cooling air intake line, the atomizing air intake line and cooling air intake line
On be respectively arranged with pressure-regulating valve III and pressure-regulating valve IV.
7. the metering distribution method based on the metered dispensing unit described in claim any one of 1-6, it is characterised in that including with
Lower step：
Step S1, the nitrous oxides concentration after current denitration is monitored by detection module, and transmitted to control module；Control module
Current nitrous oxides concentration value is judged whether in denitration claimed range, if in denitration claimed range, according to current state
Continue to run with；If higher than denitration claimed range maximum, performing step S2；If less than denitration claimed range minimum value, holding
Row step S3；；
Step S2, pass through control module control, gradually increase ammoniacal liquor flow control valve aperture, it is and anti-in real time by ammoniacal liquor flowmeter
Present ammoniacal liquor flow；Meanwhile, by control module control, dilution water flow adjustable valve aperture is gradually reduced, passes through dilution water flow
Meter Real-time Feedback flow is modified；Ammoniacal liquor flow and dilution water flow total amount is controlled to keep constant by control module, until
The concentration of the nitrogen oxides obtained after denitration reaches denitration claimed range, stops regulation ammoniacal liquor flow control valve；
Step S3, by control module control, be gradually reduced ammoniacal liquor flow control valve aperture, and anti-in real time by ammoniacal liquor flowmeter
Present ammoniacal liquor flow；Meanwhile, by control module control, gradually increase dilution water flow adjustable valve aperture, pass through dilution water flow
Meter Real-time Feedback flow is modified；Ammoniacal liquor flow and dilution water flow total amount is controlled to keep constant by control module, until
The concentration of the nitrogen oxides obtained after denitration reaches denitration claimed range, stops regulation ammoniacal liquor flow control valve；
Step S4, while step S2 and step S3 are carried out, pressure-regulating valve I and pressure-regulating valve II keep ammoniacal liquor anti-in real time
It is fed back to road and dilution water reaction circuit pressures is stable, and then ensures that ammoniacal liquor conveyor module and dilution water conveyor module outlet pressure are permanent
It is fixed.
8. metering distribution method according to claim 7, it is characterised in that：The ammoniacal liquor flow control valve and dilution water flow
Adjustable valve uses Linear flow control valve.
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