CN206045790U - A kind of low-nitrogen discharged three-stage control system of coal unit - Google Patents
A kind of low-nitrogen discharged three-stage control system of coal unit Download PDFInfo
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- CN206045790U CN206045790U CN201621057336.2U CN201621057336U CN206045790U CN 206045790 U CN206045790 U CN 206045790U CN 201621057336 U CN201621057336 U CN 201621057336U CN 206045790 U CN206045790 U CN 206045790U
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Abstract
The utility model discloses a kind of low-nitrogen discharged three-stage control system of coal unit, the combustion air pipeline being connected including the steam output circuit being connected with boiler combustion zone outlet and with boiler combustion zone import, steam output circuit is communicated to SCR reactor smoke inlets, and SCR reactor exhanst gas outlet removing dust devices, air-introduced machine are to exhanst gas outlet；Flue gas blender is also communicated with SCR reactor smoke inlets, flue gas blender is respectively communicated with air pipe line and ammonia pipeline, is provided with boiler combustion zone outlet and is connected to entrance NOXThe temperature point and CO measuring points of controller；Entrance and exit NO is added respectively on the smoke inlet of SCR reactors and outletXAmount monitoring point, entrance and exit NOXAmount monitoring point is respectively connecting to export NOXControl system, NOXControl system connects the NH of ammonia pipeline respectively3Flow control valve and boiler load.The design ensures unit denitration spray NH3It is relatively stable, reduce spray NH3Amount, reduces environmentally friendly cost, improves unit economy.
Description
Technical field
Originally it is practical to be related to denitration automatic control system in thermal power plant, especially for the low row of Large-sized Coal-fired Power group
The realization of NOx, there is provided a set of low-nitrogen discharged three-level of reliable coal unit of improving automatically controls control.
Background technology
Denitrating flue gas are the methods of the reduction DS NOx Est that current developed country generally adopts, with very high removal efficiency；
Using more selective catalytic reduction method (SCR), selective non-catalytic, reducing process (SNCR).The wherein denitration of SCR technology
, more than 90%, the escape amount of ammonia is less for efficiency, in the equipment for denitrifying flue gas of the thermal power plant in American-European and Japan and other countries and area
SCR technology constitutes about 95%.In China, with enviromental protection law, rule and standard strict and law enforcement dynamics increasingly plus
Greatly, each thermal power plant must further control the discharge of NOX using the method for denitrating flue gas.To guarantee denitrating flue gas efficiency, increase
The reliability of strong denitrating system, seriality and economy, it is necessary to the automation control system of a high-quality.To denitration medium
Quickly, it is safe to purchase, and realize being accurately controlled.Therefore the effective denitration automatic control scheme of complete set has very strong real
With value.
The current country is for denitration control design case imperfection, not enough with the research of therrmodynamic system relation for denitrating system,
Many power plant's denitrations control is automatically controlled in single loop, and control effect is unsatisfactory, and NOx is exceeded and has during NH3 escape accidents
Occur.A set of ripe effective control scheme is there is no on process system to whole therrmodynamic system, it is ensured that NOx is ultra-clean to be discharged and pre-
The generation that control NH3 escapes.
Utility model content
This utility model purpose is to provide a kind of low-nitrogen discharged three-stage control system of coal unit, from Combustion System to tail
Portion's denitration, the system of integration directly control whole coal unit blowing device, set with wind devices and back-end ductwork denitrating system
It is standby.Control difficulty is which system reduces, denitration control has been incorporated in unit overall performance system, Con trolling index is improve, has been dropped
The low action probability of environmentally friendly accident.
The purpose of this utility model is realized by following technical proposals.
A kind of low-nitrogen discharged three-stage control system of coal unit, including boiler, and be connected with boiler combustion zone outlet
Logical steam output circuit and the combustion air pipeline being connected with boiler combustion zone import, steam output circuit are communicated to SCR
The smoke inlet of reactor, the exhanst gas outlet removing dust device of SCR reactors, air-introduced machine are to exhanst gas outlet；The SCR reactors
Flue gas blender is communicated with smoke inlet also, flue gas blender is respectively communicated with air pipe line and ammonia pipeline, wherein：In boiler
Combustion zone outlet adds temperature measuring equipment and CO measurement apparatus, temperature measuring equipment and CO measurement apparatus be respectively connecting to into
Mouth NOXController；Entrance NO is added respectively on the smoke inlet and exhanst gas outlet of SCR reactorsXMeasure monitoring variable device and go out
Mouth NOXAmount monitoring variable device, entrance NOXAmount monitoring variable device and outlet NOXAmount monitoring variable device is respectively connecting to export NOXControl
System processed, NOXControl system connects the NH of ammonia pipeline respectively3Flow control valve and boiler load.
Further, the temperature measuring equipment and CO measurement apparatus are respectively connecting to the burning optimization of temperature field and CO discharge capacities
Predictor controller；The burning predictor controller of temperature field and CO discharge capacities is connected to entrance NOXController.
Further, the entrance NOXController connects the SOFA wind of combustion air pipeline air inlet blower fan and boiler respectively
The air intake valve in road.
Further, to nitrogen air supply system, nitrogen air supply system includes that the nitrogen being sequentially connected is unloaded to the ammonia pipeline connection
Material system, nitrogen preparation system and nitrogen storage system；NH3Flow control valve is arranged on ammonia pipeline.
Further, the air pipe line is communicated to air air supply system, and air pipe line is provided with dilution air.
Further, the air inlet of the combustion air pipeline is provided with and NOXThe air inflow control that controller is connected
Valve.
Further, on the combustion air pipeline, and between the exhanst gas outlet and cleaner unit of SCR reactors it is provided with air
Preheater.
Relative to prior art, the advantage of control strategy after this utility model optimization：
This utility model is used for the reliable low row NOx solutions of Large-sized Coal-fired Power group.Three-level denitration control is completed, not only
Only chemical spray is carried out at back-end ductwork and complete denitration control, but machine set system is considered as a whole, optimization burning, by prison
Fire detecting flame exit CO and change of temperature field, Prediction Control coal-air ratio and SOFA air quantity, stable SCR inlet NOx concentration, subtract significantly
Third level denitration control pressure is delayed.Its logical design rationally, adjusts whole excellent control accurately, ensures the safety of device systems, increase
Environmentally friendly efficiency is added.
The design ensures stablizing for unit denitration device entrance NOx and outlet NOx, has both contained burning optimization denitration, and
Contain back-end ductwork chemical technology denitration, effective control power plant's NOx discharge capacities, and prevent the NH that system disturbance causes3Escape
Anecdote event.
The design ensures unit denitration spray NH3It is relatively stable, reduce spray NH3Amount, reduces environmentally friendly cost, improves
Unit economy.
Description of the drawings
Fig. 1 is three-level denitration control system schematic flow sheet.
In figure：1- temperature measuring equipments and CO measurement apparatus；2-NOXController；3- blower fans；4- boilers；5-SOFA air channels；
6- combustion air air inlets；7- economizers；8- air preheaters；9-SCR reactors；10- flue gas blenders；11-NH3Adjust
Valve；12- dilution airs；13- entrance NOXAmount monitoring device；14- exports NOXAmount monitoring device；15-NOXControl system；16- is removed
Dirt device；17- air-introduced machines；18- boiler loads；19- nitrogen discharge systems；20- nitrogen preparation systems；21- nitrogen storage systems.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment is described further to this utility model.
As shown in figure 1, a kind of low-nitrogen discharged three-stage control system of coal unit, a kind of coal unit it is low-nitrogen discharged three
Level control system, including boiler 4, and the steam output circuit being connected is exported with boiler combustion zone and is entered with boiler combustion zone
The combustion air pipeline that mouth is connected, combustion air pipeline are provided with blower fan 3, air preheater 8, are set with 4 place of being connected of boiler
There is combustion air air inlet 6.Steam output circuit is communicated to the smoke inlet of SCR reactors 9, adds on steam output circuit
Economizer 7；The exhanst gas outlet removing dust device 16, air-introduced machine 17 to exhanst gas outlet of SCR reactors 9, the flue gas of SCR reactors 9 go out
Air preheater 8 is provided between mouth and cleaner unit 16.Flue gas blender 10, cigarette are communicated with the smoke inlet of SCR reactors 9 also
Gas blender 10 is respectively communicated with air pipe line and ammonia pipeline, and air pipe line is communicated to air air supply system, sets on air pipe line
There is dilution air 12.To nitrogen air supply system, nitrogen air supply system includes the nitrogen discharge system being sequentially connected to ammonia pipeline connection
19th, nitrogen preparation system 20 and nitrogen storage system 21；NH3Regulating valve 11 is arranged on ammonia pipeline.
Wherein, three groups of remote sensing type temperature measuring equipments are added in boiler combustion zone outlet, combustion zone outlet installs two groups additional
Remote sensing type CO measurement apparatus, and increase the low row NOx intelligent controllers in combustion zone；Temperature measuring equipment and CO measurement apparatus 1 are distinguished
It is connected to the burning optimization predictor controller of temperature field and CO discharge capacities；As the firsts and seconds control point of the system, temperature field
Entrance NO is connected to the burning predictor controller of CO discharge capacitiesXController 2, the air inlet of combustion air pipeline be provided with
NOXThe air inflow control valve that controller 2 is connected, entrance NOXController 2 connects 3 He of combustion air pipeline air inlet blower fan respectively
The air intake valve in the SOFA air channels 5 of boiler 4, air inlet of the low row NOx intelligent controllers in combustion zone by control combustion air pipeline
Control valve door corrects air output.
Temperature measuring equipment and CO measurement apparatus need late design, are independently mounted at boiler furnace burning-out zone.
In addition, adding entrance NO respectively on the smoke inlet and exhanst gas outlet of SCR reactors 9XAmount monitoring variable device
13 and outlet NOXAmount monitoring variable device 14, entrance NOXAmount monitoring variable device 13 and outlet NOXAmount monitoring variable device 14 connects respectively
To outlet NOXControl system 15, NOXControl system 15 connects the NH of ammonia pipeline respectively3Regulating valve 11 and boiler load 18.Make
For the three class control point of the system.
The system passes through NH based on SCR reactors 93Flow control valve 11 completes NH3Spray into burner hearth and complete chemical reaction,
In stove, NOx is removed and is produced N2And H2The technical process of O, in traditional denitration NH3Introduce in flow rate calculation total fuel quantity total blast volume,
The burning-out zone temperature that installs additional, build NH3Intelligence computation demand, finally using the actual deviation of the PID Closed-cycle corrections amount of calculation.
The system installs three groups of remote sensing type temperature measuring equipments additional in boiler combustion zone outlet, and combustion zone outlet installs two groups distant additional
Sense formula CO measurement apparatus, complete the coarse evaluation for fired state according to the peak value and CO variation tendencies of ignition temperature, are combustion
Burn optimization and numerical basis are provided.Temperature measuring equipment and CO measurement apparatus, into the excellent control units of combustion zone NOx of design, pass through
Temperature and CO discharge capacities estimate calculating, correct fan delivery, optimization burning, stable NOx discharge capacities in advance.(the low row NOx pre-controls of one-level).
Under issue a command to SOFA wind (burnout degree) the door simultaneous operation device in boiler SOFA air channels, dynamic corrections after-flame air door and main steam flow
Follow curve.(two grades low row NOx pre-controls).
Increase the low row NOx intelligent controllers in combustion zone；The low row NOx intelligent controllers in combustion zone correct air output, combustion zone
Low row NOx intelligent controllers correct SOFA wind dosages；Increase NH3Traffic demand intelligent computer, and estimated using one-level denitration
Control is to afterbody NH3Flow setting value is modified.Third level denitration is controlled by denitration NH3Flow-control is completed, in afterbody cigarette
Road precise control NOx discharge capacity (the low row NOx essences control of three-level).
Burning optimization predictor controller is based on burning-out zone temperature field and CO discharge capacity algorithm for designs.And band restriction dynamic is repaiied respectively
Positive total blast volume and after-flame air quantity, optimization burning, complete Two-stage control before NOx.NH3Demand intelligent computer be based on total blast volume and
Algorithm for design after always fuel sets ratio and considers combustion zone outlet temperature.Denitrating technique NH3Flow set value is from the calculation
Method, finally using the PID Closed-cycle corrections amount of calculation and the difference of actual demand amount, completes the NOx controls of afterbody.
The principle of the system is：
If the measuring point of design is added at two；It is related to actuator at three；Two logical calculated modules for adding design.Two
Place's measuring point is arranged on boiler combustion furnace arch, furnace nose, using remote sensing and spectral measurement element, measures burnup area afterbody cigarette temperature respectively
With CO contents.According to present Theory of Combustion, boiler load increase, fuel quantity increase, and ignition temperature increase, NOx discharge capacities increase, coal
The little imbalance of strong wind, CO contents increase.By said temperature and CO measured values by DCS system, predictor controller is built, respectively amplitude limit
Amendment total blast volume and SOFA air quantity.By dynamic corrections, hypoxia air distribution, NOx discharge capacities are reduced, burning-out zone is compensated by SOFA air quantity
Oxygen amount, completes two grades low row NOx optimizations of combustion zone, reaches burning optimization index.The equipment that the region is related to has pressure fan
The air intake valve in movable vane and SOFA air channels.
Back-end ductwork denitration engineering uses selective-catalytic-reduction denitrified technique (SCR), i.e., with NH3As reducing agent
By the NO in flueXResolve into harmless N2And H2O.The ultimate principle of reaction is：
4NO+4NH3+O2→4N2+6H2O
6NO2+8NH3→7N2+12H2O
NO+NO2+2NH3→2N2+3H2O
SCR device is mainly made up of 2 big main bodys:NOx removal agent preparation system and reactor body.By into reactor
Spray into reactant NH3, NOx is reduced to into nitrogen.Due to this reduction reaction it is more sensitive to temperature, therefore also need add catalyst with
Intensified response activity, meets the temperature requirement of reaction.A process is also needed to stably as liquefied ammonia spray finishes Jing chemical reactions,
There is delay in the NOx concentration of measurement, its control object is belonging to large time-delay system.Therefore, perfect denitration automatic control system
Promptness, stability and the cost-effectiveness requirement of system control should be embodied.Due to having the first two grade low row NOx design, denitrating technique
Entrance NOx is relatively stable so that third level denitration control difficulty reduces, and realizes the precision controlling of the low rows of NOx, makes final
NOx discharge should meet environmental requirement, prevent NH again3Escape, do not result in back-end ductwork corrosion.
SCR denitrating flue gas control systems utilize NH3/ NOx mol ratios come the ammonia flow required for providing, using import NOx
The product of concentration and flue gas flow obtains the amount of basic NOx materials, then is multiplied by NH3/ NOx mol ratios are exactly ammonia flow demand
Amount, exit NOx concentration are controlled to NH3/ NOx mol ratios are corrected (or be interpreted as amendment) to ammonia demand and are participated in control,
Final result is exactly the ammonia flow needed for current entry NOx purifications.But value of calculation is unable to the change of anticipation entrance NOx in itself and becomes
Gesture, therefore it is continuing with coal-air ratio, load and combustion zone temperature trend intelligence computation NH3Dynamic need amount.By above-mentioned two NH3
Amount of calculation is added, and realizes automatically controlling denitration by ammonia flow control valve.Ammonia flow control is the servo-actuated single loop of setting value
Control system.Ammonia flow carries out density revision by pressure and temperature, three take in after as single loop P ID controls PV values.Meter
Calculate ammonia flow setting value:
Amount=total air × the inlet NOx concentration of NOx materials
Function f (x) is setting function of the denitration efficiency value to nitrogen ammonia mol ratio.
Denitration efficiency=【Import NOX- outlets NOX setting values (not putting into from motion tracking actual value)】/ import NOX ×
100%
Mol ratio=f2 (x) × P ID outputs after amendment
After ammonia flow SP=NOX thing amounts × amendment mole+ammonia flow demand intelligent computer * CO advance estimate modifications
Denitration efficiency calculates used inlet NOx concentration and the exit NOx concentration measured value of NOx concentration Control PID is equal
Using the revised value of Jing oxygen amount.Its innovation representation:
The NO of amendmentXValue=NOXActual value (× 10-6) × 15/ (21-O2 actual values)
After exit NOx concentration control input is automatic, the physical significance of PID output valves is ratio amendment ammonia set amount, is met
The requirement of control exit NOx concentration.This amendment adds ± 0.2 restriction, i.e. ammonia flow within currently ± 0.2 times of amount to going out
Mouth NOx concentration realizes that closed loop is adjusted.
Above content is with reference to specific preferred implementation further detailed description of the utility model, it is impossible to
Assert that specific embodiment of the present utility model is only limitted to this, for this utility model person of an ordinary skill in the technical field
For, without departing from the concept of the premise utility, some simple deduction or replace can also be made, should be all considered as
Belong to this utility model scope of patent protection is determined by the claims submitted to.
Claims (7)
1. the low-nitrogen discharged three-stage control system of a kind of coal unit, including boiler (4), and be connected with boiler combustion zone outlet
Logical steam output circuit and the combustion air pipeline being connected with boiler combustion zone import, steam output circuit are communicated to SCR
The smoke inlet of reactor (9), exhanst gas outlet removing dust device (16) of SCR reactors (9), air-introduced machine (17) are to exhanst gas outlet；
Flue gas blender (10) is communicated with the smoke inlet of the SCR reactors (9) also, flue gas blender (10) is respectively communicated with air
Pipeline and ammonia pipeline, it is characterised in that：Temperature measuring equipment and CO measurement apparatus (1) are added in boiler combustion zone outlet,
Temperature measuring equipment and CO measurement apparatus (1) are respectively connecting to entrance NOXController (2)；Enter in the flue gas of SCR reactors (9)
Entrance NO is added respectively on mouth and exhanst gas outletXAmount monitoring variable device (13) and outlet NOXAmount monitoring variable device (14), entrance
NOXAmount monitoring variable device (13) and outlet NOXAmount monitoring variable device (14) is respectively connecting to export NOXControl system (15), NOX
Control system (15) connects the NH of ammonia pipeline respectively3Flow control valve (11) and boiler load (18).
2. the low-nitrogen discharged three-stage control system of coal unit according to claim 1, it is characterised in that：The temperature is surveyed
Amount device and CO measurement apparatus (1) are respectively connecting to the burning optimization predictor controller of temperature field and CO discharge capacities；Temperature field and CO
The burning predictor controller of discharge capacity is connected to entrance NOXController (2).
3. the low-nitrogen discharged three-stage control system of coal unit according to claim 2, it is characterised in that：The entrance NOX
Controller (2) connects the air intake valve in the SOFA air channels (5) of combustion air pipeline air inlet blower fan (3) and boiler (4) respectively.
4. the low-nitrogen discharged three-stage control system of coal unit according to claim 1, it is characterised in that：The ammonia pipe
Road is communicated to nitrogen air supply system, and nitrogen air supply system includes nitrogen discharge system (19), the nitrogen preparation system (20) being sequentially connected
With nitrogen storage system (21)；NH3Flow control valve (11) is arranged on ammonia pipeline.
5. the low-nitrogen discharged three-stage control system of coal unit according to claim 1, it is characterised in that：The air hose
Road is communicated to air air supply system, and air pipe line is provided with dilution air (12).
6. the low-nitrogen discharged three-stage control system of coal unit according to claim 1, it is characterised in that：The burning is empty
The air inlet of air pipe is provided with and NOXThe air inflow control valve that controller (2) is connected.
7. the low-nitrogen discharged three-stage control system of coal unit according to claim 1, it is characterised in that：The burning is empty
On air pipe, and the exhanst gas outlet and cleaner unit (16) of SCR reactors (9) between be provided with air preheater (8).
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| CN201621057336.2U CN206045790U (en) | 2016-09-14 | 2016-09-14 | A kind of low-nitrogen discharged three-stage control system of coal unit |
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| CN201621057336.2U CN206045790U (en) | 2016-09-14 | 2016-09-14 | A kind of low-nitrogen discharged three-stage control system of coal unit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107486009A (en) * | 2017-07-18 | 2017-12-19 | 西安西热锅炉环保工程有限公司 | A kind of fired power generating unit minimum discharge denitration control system |
| CN109794150A (en) * | 2019-03-20 | 2019-05-24 | 中国华能集团清洁能源技术研究院有限公司 | A kind of band external bed CFB boiler denitrating flue gas control method and system |
| CN111520739A (en) * | 2020-04-29 | 2020-08-11 | 浙江浙能兰溪发电有限责任公司 | Method, device and system for adjusting carbon monoxide in flue gas of coal-fired boiler |
-
2016
- 2016-09-14 CN CN201621057336.2U patent/CN206045790U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107486009A (en) * | 2017-07-18 | 2017-12-19 | 西安西热锅炉环保工程有限公司 | A kind of fired power generating unit minimum discharge denitration control system |
| CN109794150A (en) * | 2019-03-20 | 2019-05-24 | 中国华能集团清洁能源技术研究院有限公司 | A kind of band external bed CFB boiler denitrating flue gas control method and system |
| CN109794150B (en) * | 2019-03-20 | 2021-09-17 | 中国华能集团清洁能源技术研究院有限公司 | Flue gas denitration control method and system for CFB boiler with external bed |
| CN111520739A (en) * | 2020-04-29 | 2020-08-11 | 浙江浙能兰溪发电有限责任公司 | Method, device and system for adjusting carbon monoxide in flue gas of coal-fired boiler |
| CN111520739B (en) * | 2020-04-29 | 2022-03-25 | 浙江浙能兰溪发电有限责任公司 | Method, device and system for adjusting carbon monoxide in flue gas of coal-fired boiler |
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Effective date of registration: 20180730 Address after: 710065 No. 1 building, No. 12, Qin Tang, No. 187, science and technology four road, hi tech Zone, Xi'an, Shaanxi Patentee after: North China Electric Power Research Institute Co., Ltd. Xi'an branch Address before: 710065 No. 1 building, No. 12, Qin Tang, No. 187, science and technology four road, hi tech Zone, Xi'an, Shaanxi Patentee before: North China Electrical Power Research Institute (Xi'an) Co., Ltd. |