CN112403262A - Denitration system - Google Patents

Denitration system Download PDF

Info

Publication number
CN112403262A
CN112403262A CN202011355325.3A CN202011355325A CN112403262A CN 112403262 A CN112403262 A CN 112403262A CN 202011355325 A CN202011355325 A CN 202011355325A CN 112403262 A CN112403262 A CN 112403262A
Authority
CN
China
Prior art keywords
scr
concentration
denitration device
nitrogen oxides
ammonia injection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011355325.3A
Other languages
Chinese (zh)
Inventor
杨震力
丁连生
张国新
章硕
张挺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guohua Power Branch of China Shenhua Energy Co Ltd
Shenhua Guohua Zhoushan Power Generation Co Ltd
Original Assignee
Guohua Power Branch of China Shenhua Energy Co Ltd
Shenhua Guohua Zhoushan Power Generation Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guohua Power Branch of China Shenhua Energy Co Ltd, Shenhua Guohua Zhoushan Power Generation Co Ltd filed Critical Guohua Power Branch of China Shenhua Energy Co Ltd
Priority to CN202011355325.3A priority Critical patent/CN112403262A/en
Publication of CN112403262A publication Critical patent/CN112403262A/en
Pending legal-status Critical Current

Links

Images

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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—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
    • B01D53/346—Controlling the process
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (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)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

The application discloses deNOx systems. This denitration includes SCR denitrification facility and the setting value dynamic programming module that connects gradually, spout ammonia flow and confirm unit, valve aperture and confirm unit and valve controller, wherein: the set value dynamic programming module is used for determining an instantaneous set value according to the concentration of nitrogen oxides at a clean flue gas outlet of the SCR denitration device; the ammonia injection flow determining unit is used for determining the target ammonia injection flow according to the concentrations of nitrogen oxides at SCR outlets on two sides of the SCR denitration device or the concentrations of the nitrogen oxides at the SCR inlets on two sides, the concentration of the nitrogen oxides at a clean flue gas outlet of the SCR denitration device and an instantaneous set value; the valve opening determining unit is used for determining the target opening of a denitration valve in the SCR denitration device according to the target ammonia spraying flow; and the valve controller is used for controlling a denitration valve in the SCR denitration device according to the target opening degree. Therefore, denitration can be automatically controlled through the denitration system.

Description

Denitration system
Technical Field
The application relates to a gaseous pollutants emission control field especially relates to a deNOx systems.
Background
Along with the environmental problem receives more and more attention, need add deNOx systems among the current coal burner and carry out the denitration to avoid excessive nitrogen oxide's emission. However, when the existing denitration system carries out denitration, an operator is usually required to manually operate the denitration control, so that the denitration control effect is poor, and the exceeding of nitrogen oxides is often caused.
Disclosure of Invention
The embodiment of the application provides a denitration system for solve among the prior art artifical manual operation control denitration, the relatively poor problem of denitration effect that causes.
The embodiment of the application provides a deNOx systems, includes: the system comprises an SCR denitration device, a set value dynamic planning module, an ammonia injection flow determining unit connected with the set value dynamic planning module, a valve opening determining unit connected with the ammonia injection flow determining unit, and a valve controller connected with the valve opening determining unit, wherein:
the set value dynamic programming module is used for determining an instantaneous set value according to the concentration of nitrogen oxides at a clean flue gas outlet of the SCR denitration device;
the ammonia injection flow rate determining unit is used for determining target ammonia injection flow rate according to the concentrations of nitrogen oxides at SCR outlets on two sides of the SCR denitration device or the concentrations of nitrogen oxides at the SCR inlets on two sides, the concentration of nitrogen oxides at a clean flue gas outlet of the SCR denitration device and the instantaneous set value;
the valve opening determining unit is used for determining the target opening of a denitration valve in the SCR denitration device according to the target ammonia spraying flow;
and the valve controller is used for controlling a denitration valve in the SCR denitration device according to the target opening degree.
Preferably, the determining the instantaneous set value according to the concentration of nitrogen oxides at the clean flue gas outlet of the SCR denitration device specifically includes: and determining the instantaneous set value according to the concentration of the nitrogen oxides at the clean flue gas outlet of the SCR denitration device, the preset value of the mean value of the concentration, the preset sampling period of the concentration and the current time.
Preferably, the determining the instantaneous set value according to the concentration of nitrogen oxides at the clean flue gas outlet of the SCR denitration device, the preset value of the mean value of the concentration, the preset sampling period of the concentration and the current time specifically includes: calculating the instantaneous set value using the following formula:
Figure BDA0002802439360000021
wherein:
a is the preset value of the concentration mean value;
b is the concentration of nitrogen oxides at a clean flue gas outlet of the SCR denitration device;
c is the preset sampling period of the concentration;
d is the current time;
e is the instantaneous set value.
Preferably, the concentration mean preset value is a one-hour concentration mean preset value determined according to environmental assessment indexes.
Preferably, the ammonia injection flow rate determining unit specifically includes: and an ammonia injection flow determining unit of the multivariable predictive control model.
Preferably, the method for determining the target ammonia injection flow rate according to the concentrations of nitrogen oxides at the SCR outlets on two sides of the SCR denitration device or the concentrations of nitrogen oxides at the SCR inlets on two sides, the concentration of nitrogen oxides at the clean flue gas outlet of the SCR denitration device, and the instantaneous set value specifically includes:
and determining a target ammonia injection flow according to the concentrations of nitrogen oxides at SCR outlets at two sides of the SCR denitration device or the concentrations of nitrogen oxides at SCR inlets at two sides of the SCR denitration device, the concentration of nitrogen oxides at a clean flue gas outlet of the SCR denitration device, a first ammonia injection flow and the instantaneous set value, wherein the first ammonia injection flow is determined according to the actual load power of a unit connected with the denitration system.
Preferably, the first ammonia injection flow rate is determined by inputting the actual load power into a model between the unit load power and the ammonia injection amount.
Preferably, the valve opening determining unit specifically includes: a valve opening determining unit of a multivariable predictive control model or a PID ammonia spraying flow determining unit.
Preferably, a nitrogen oxide concentration measuring device is arranged at a clean flue gas outlet of the SCR denitration device, and the nitrogen oxide concentration measuring device is connected with the set value dynamic programming module.
Preferably, nitrogen oxide concentration measuring devices are respectively arranged at the SCR outlets on two sides of the SCR denitration device, or nitrogen oxide concentration measuring devices are respectively arranged at the SCR inlets on two sides of the SCR denitration device, and the nitrogen oxide concentration measuring devices arranged at the SCR outlets or inlets on two sides of the SCR denitration device are respectively connected with the ammonia injection flow determining unit.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
adopt the deNOx systems that this application embodiment provided, it includes SCR denitrification facility, setting value dynamic programming module, the ammonia flow of spouting confirm the unit with setting value dynamic programming module is connected, with spout the valve aperture confirm the unit that the ammonia flow confirms the unit is connected, and with the valve controller that the valve aperture confirms the unit is connected, wherein: the set value dynamic programming module is used for determining an instantaneous set value according to the concentration of nitrogen oxides at a clean flue gas outlet of the SCR denitration device; the ammonia injection flow determining unit is used for determining the target ammonia injection flow according to the concentrations of nitrogen oxides at SCR outlets on two sides of the SCR denitration device or the concentrations of the nitrogen oxides at the SCR inlets on two sides, the concentration of the nitrogen oxides at a clean flue gas outlet of the SCR denitration device and an instantaneous set value; the valve opening determining unit is used for determining the target opening of a denitration valve in the SCR denitration device according to the target ammonia spraying flow; and the valve controller is used for controlling a denitration valve in the SCR denitration device according to the target opening degree. Like this, can carry out automated control to the denitration through this deNOx systems, solve the problem among the prior art.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic structural diagram of a denitration system provided in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
As shown in the foregoing, when an existing denitration system performs denitration, an operator generally needs to manually operate the denitration control, and the operator usually has a poor denitration control effect according to different personal experiences, which often causes the standard exceeding of nitrogen oxides.
Based on this, the application provides a deNOx systems, can be used for solving above-mentioned technical problem. Fig. 1 is a schematic diagram of a specific structure of the denitration system 10, which includes: the system comprises a set value dynamic programming module 11, an ammonia injection flow determining unit 12, a valve opening determining unit 13, a valve controller 14 and a selective catalytic reduction denitration device 15 (hereinafter referred to as an SCR denitration device 15), wherein the set value dynamic programming module 11 is connected with the ammonia injection flow determining unit 12, the ammonia injection flow determining unit 12 is connected with the valve opening determining unit 13, and the valve opening determining unit 13 is connected with the valve controller 14.
The function of the setpoint dynamic programming module 11 is, among other things, that it can determine the instantaneous setpoint as a function of the nitrogen oxide concentration at the clean flue gas outlet of the SCR denitration device 11. The instantaneous setting is typically a setting for a short period of time, and may change over time. Therefore, when the subsequent ammonia injection flow rate determination unit 12 determines the ammonia injection flow rate based on the instantaneous set value, the determination is also performed in real time based on time.
In practical applications, the set value dynamic programming module 11 may specifically determine the instantaneous set value according to the concentration of nitrogen oxides at the clean flue gas outlet of the SCR denitration device 15, the preset value of the concentration mean value, the preset sampling period of the concentration, and the current time.
For example, a nitrogen oxide concentration measuring device may be disposed at the clean flue gas outlet of the SCR denitration device 15, and the nitrogen oxide concentration measuring device is connected to the set value dynamic programming module 11, so that the nitrogen oxide concentration at the clean flue gas outlet of the SCR denitration device 15 may be measured by the nitrogen oxide concentration measuring device, and the measured nitrogen oxide concentration may be sent to the set value dynamic programming module 11.
The concentration mean value preset value is generally determined according to environmental assessment indexes, for example, the environmental assessment indexes are that the one-hour concentration mean value of the nitric oxide is less than or equal to 50mg/Nm3At this time, the preset value of the concentration mean value can be a preset value of the concentration mean value in one hour determined according to the environmental assessment index, and the preset value of the concentration mean value in one hour is less than or equal to 50mg/Nm3。
The preset concentration sampling period can be set according to specific conditions, such as the average concentration of the nitric oxides in the environmental assessment index per hour is less than or equal to 50mg/Nm3The preset sampling period of the concentration needs to be less than 0.5 hours (i.e. at least twice sampling for the concentration of nitrogen oxide within 1 hour), for example, the preset sampling period of the concentration is 10 minutes, 5 minutes, 1 minute, 30 seconds, 10 seconds, 5 seconds, 1 second or other time periods, and every other time periodThe sampling period is preset for each concentration, and the nitrogen oxide concentration at the clean flue gas outlet of the SCR denitration device 15 can be sampled once.
When the average value of the concentration of the above-mentioned environmental assessment index nox in one hour is less than or equal to 50mg/Nm3, since the corresponding settlement is performed every other hour, the current time may specifically refer to a time period from the previous settlement time point (usually, the whole hour), for example, the time point of the previous settlement is 9 points, the current time point is 9 points and 10 minutes, and the current time is 10 minutes (or 600 seconds, etc.).
After determining the concentration of nitrogen oxides, the preset value of the mean value of the concentration, the preset sampling period of the concentration and the current time at the outlet of the clean flue gas of the SCR denitration device 15, the instantaneous set value can be calculated by using the following formula:
Figure BDA0002802439360000051
in this formula: a is a concentration average value preset value; b is the concentration of nitrogen oxides at the clean flue gas outlet of the SCR denitration device 15; c is a concentration preset sampling period, and the unit is second; d is the current time, and the unit is second; e is the instantaneous set value.
Of course, it is conceivable that 3600 seconds (i.e. 1 hour) in the above formula can also be converted into 60 minutes by taking the unit of minute, the unit of the corresponding preset sampling period of the concentration is also minute, and the unit of the current time is also minute.
The ammonia injection flow rate determination unit 12 may specifically determine the target ammonia injection flow rate according to the concentrations of nitrogen oxides at the SCR outlets on both sides of the SCR denitration device 15 or the concentrations of nitrogen oxides at the SCR inlets on both sides, the concentration of nitrogen oxides at the clean flue gas outlet of the SCR denitration device 15, and the instantaneous set value.
For example, nitrogen oxide concentration measuring devices may be respectively disposed at the SCR outlets on both sides (side a and side B) of the SCR denitration device 15, and the disposed nitrogen oxide concentration measuring devices are respectively connected to the ammonia injection flow rate determination unit 12, so that the nitrogen oxide concentrations at the SCR outlets on both sides may be respectively measured by the two nitrogen oxide concentration measuring devices, and the measured nitrogen oxide concentrations at the SCR outlets on both sides are sent to the ammonia injection flow rate determination unit 12.
Or, nitrogen oxide concentration measuring devices may be respectively disposed at the SCR inlets on both sides of the SCR denitration device 15, and the disposed nitrogen oxide concentration measuring devices are respectively connected to the ammonia injection flow rate determination unit 12, so that the nitrogen oxide concentrations at the SCR inlets on both sides may be respectively measured by the two nitrogen oxide concentration measuring devices, and the measured nitrogen oxide concentrations at the SCR inlets on both sides may be sent to the ammonia injection flow rate determination unit 12.
For the concentration of nitrogen oxide at the clean flue gas outlet of the SCR denitration device 15, a nitrogen oxide concentration measuring device may be disposed at the clean flue gas outlet of the SCR denitration device 15, and the nitrogen oxide concentration measuring device is connected to the set value dynamic programming module 11 and the ammonia injection flow rate determining unit 12, so that the ammonia injection flow rate determining unit 12 may also obtain the concentration of nitrogen oxide measured by the nitrogen oxide concentration measuring device.
It should be noted that the ammonia injection flow rate determination unit 12 may specifically be an ammonia injection flow rate determination unit of a Multivariable predictive control Model (MPC), which has a plurality of output quantities (for example, including the nox concentration and the instantaneous set value at the clean flue gas outlet of the SCR denitration device 15, and the like), and determines the target ammonia injection flow rate by using control strategies such as multi-step testing, rolling optimization, and feedback correction.
As for the ammonia injection flow rate determination unit of the multivariable predictive control model, the output values may include the concentration of nitrogen oxides at the SCR outlets on both sides of the SCR denitration device 15 or the concentration of nitrogen oxides at the SCR inlets on both sides, the concentration of nitrogen oxides at the net flue gas outlet of the SCR denitration device 15, an instantaneous set value, and a first ammonia injection flow rate, so as to finally determine the target ammonia injection flow rate according to these input values, wherein the first ammonia injection flow rate may be determined according to the actual load power of the plant connected to the denitration system 10, for example, the first ammonia injection flow rate may be determined by inputting the actual load power to a model between the plant load power and the ammonia injection amount.
When determining the target ammonia injection flow rate according to the input amount, the ammonia injection flow rate determining unit of the multivariable predictive control model may finally measure the target ammonia injection flow rate according to the deviation between the nitrogen oxide concentration at the clean flue gas outlet of the SCR denitration device 15 and the instantaneous set value, and the nitrogen oxide concentrations at the SCR outlets on both sides of the SCR denitration device 15 or the nitrogen oxide concentrations at the SCR inlets on both sides, and in combination with the first ammonia injection flow rate, and send the target ammonia injection flow rate to the valve opening determining unit 13.
The valve opening determination unit 13 may determine a target opening of a denitration valve in the SCR denitration device 15 based on the target ammonia injection flow rate. For example, the valve opening determination unit 13 may combine a corresponding relationship between the denitration valve opening and the ammonia injection flow rate or an empirical formula, so as to obtain the target opening according to the target ammonia injection flow rate.
The valve opening determining unit 13 may be a valve opening determining unit of a multivariable predictive control model, or may be a pid (process integrated differential) ammonia injection flow determining unit.
After determining the target opening, the valve opening determination unit 13 sends the target opening to the valve controller 14, so that the valve controller 14 can output an ammonia injection valve opening adjustment instruction according to a deviation between the target opening and the actual opening, thereby finally changing the opening of the ammonia injection valve of the SCR denitration device 15, and further adjusting the ammonia injection flow rate, so that the concentration of nitrogen oxides at the clean flue gas outlet of the current SCR denitration device 15 can approach the instantaneous set value.
By adopting the denitration system 10 provided by the embodiment of the application, the denitration system comprises an SCR denitration device 15, a set value dynamic programming module 11, an ammonia injection flow rate determining unit 12 connected with the set value dynamic programming module 11, a valve opening determining unit 13 connected with the ammonia injection flow rate determining unit 12, and a valve controller 14 connected with the valve opening determining unit 13, wherein: a set value dynamic programming module 11, configured to determine an instantaneous set value according to a nitrogen oxide concentration at a clean flue gas outlet of the SCR denitration device 15 at 11; the ammonia injection flow rate determining unit 12 is configured to determine a target ammonia injection flow rate according to the concentrations of nitrogen oxides at the SCR outlets on both sides of the SCR denitration device 15 or the concentrations of nitrogen oxides at the SCR inlets on both sides, the concentration of nitrogen oxides at a clean flue gas outlet of the SCR denitration device 15, and an instantaneous set value; a valve opening determining unit 13, configured to determine a target opening of a denitration valve in the SCR denitration device 15 according to the target ammonia injection flow rate; and a valve controller 14 for controlling the denitration valve in the SCR denitration device 15 according to the target opening degree. Thus, the denitration system 10 can be used for automatically controlling denitration, and the problems in the prior art are solved.
In practical applications, in the denitration system 10 provided in this embodiment of the present application, the setting value dynamic programming module 11 may specifically determine the instantaneous setting value according to the concentration of the nitrogen oxide at the clean flue gas outlet of the SCR denitration device 15, the preset value of the average concentration value, the preset sampling period of the concentration, and the current time, and the calculation process of the setting value is combined with the actually measured concentration of the nitrogen oxide at the clean flue gas outlet of the SCR denitration device 15, the preset value of the average concentration value (determined by the environmental assessment index), and the like, compared with the setting value as a fixed value (referred to as a fixed setting value), so the control sensitivity is high.
In addition, when the ammonia injection flow rate determining unit 12 determines the target ammonia injection flow rate based on the concentrations of nitrogen oxides at the SCR outlets on both sides of the SCR denitration device 15 or the concentrations of nitrogen oxides at the SCR inlets on both sides, the concentration of nitrogen oxides at the clean flue gas outlet of the SCR denitration device 15, the instantaneous set value, and the first ammonia injection flow rate, the ammonia injection flow rate determining unit may use the concentration of nitrogen oxides at the clean flue gas outlet of the SCR denitration device 15 as a main controlled variable (a difference between a calculated value and the instantaneous set value), and use the concentrations of nitrogen oxides at the SCR outlets on both sides (or the concentrations of nitrogen oxides at the SCR inlets on both sides) as a sub controlled variable.
For the ammonia injection flow determining unit of the multivariable predictive control model and the valve opening determining unit of the multivariable predictive control model, historical operation big data can be collected in practical application to perform feasibility analysis and preliminary model identification, further an additional test signal experiment can be performed, and an object can be fully excited to obtain a better process model; after the identification experiment, the model needs to be verified and necessary simulation control is carried out, and if the identification model meets the control requirement, an online commissioning link can be entered; after the multivariable predictive control model is put into operation, closed-loop identification experiments and model identification can be carried out, and the quality and the control effect of the multivariable predictive control model are further improved.
The ammonia injection flow rate determining unit of the multivariable predictive control model can also adopt the following modes when determining the target ammonia injection flow rate according to the input amount including the nitrogen oxide concentration at the clean flue gas outlet of the SCR denitration device 15, the instantaneous set value, the nitrogen oxide concentrations at the SCR outlets on two sides of the SCR denitration device 15 or the nitrogen oxide concentrations at the SCR inlets on two sides and the first ammonia injection flow rate: the concentration of nitrogen oxides at the clean flue gas outlet of the SCR denitration device 15 is controlled by an instantaneous set value, the concentrations of nitrogen oxides at the SCR outlets on both sides of the SCR denitration device 15 or the concentrations of nitrogen oxides at the SCR inlets on both sides of the SCR denitration device 15 are interval control, that is, when the concentrations of nitrogen oxides at the SCR outlets on both sides of the SCR denitration device 15 or the concentrations of nitrogen oxides at the SCR inlets on both sides fall within a certain interval range, the contribution of the nitrogen oxides to the change of the nitrogen oxides at the SCR outlets or the SCR inlets on both sides of the SCR denitration device is not considered by the; only when the concentration of nitrogen oxides at the SCR outlets on both sides or the concentration of nitrogen oxides at the SCR inlets on both sides of the SCR denitration device 15 exceeds the interval range (for example, the upper limit of the interval range is set to 42mg/Nm3The lower limit is set to 20mg/Nm3) And the target ammonia injection flow rates are changed according to the change amount, so that the design can avoid contradiction and conflict caused by the correlation between the concentration of nitrogen oxides at the clean flue gas outlet of the SCR denitration device 15 and the target ammonia injection flow rate when an ammonia injection flow rate determining unit of the multivariable predictive control model calculates the target ammonia injection flow rate, and a better control effect can be obtained.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (10)

1. A denitration system, comprising: the system comprises an SCR denitration device, a set value dynamic planning module, an ammonia injection flow determining unit connected with the set value dynamic planning module, a valve opening determining unit connected with the ammonia injection flow determining unit, and a valve controller connected with the valve opening determining unit, wherein:
the set value dynamic programming module is used for determining an instantaneous set value according to the concentration of nitrogen oxides at a clean flue gas outlet of the SCR denitration device;
the ammonia injection flow rate determining unit is used for determining target ammonia injection flow rate according to the concentrations of nitrogen oxides at SCR outlets on two sides of the SCR denitration device or the concentrations of nitrogen oxides at the SCR inlets on two sides, the concentration of nitrogen oxides at a clean flue gas outlet of the SCR denitration device and the instantaneous set value;
the valve opening determining unit is used for determining the target opening of a denitration valve in the SCR denitration device according to the target ammonia spraying flow;
and the valve controller is used for controlling a denitration valve in the SCR denitration device according to the target opening degree.
2. The denitration system of claim 1, wherein determining an instantaneous set value based on a concentration of nitrogen oxides at a net flue gas outlet of the SCR denitration device comprises: and determining the instantaneous set value according to the concentration of the nitrogen oxides at the clean flue gas outlet of the SCR denitration device, the preset value of the mean value of the concentration, the preset sampling period of the concentration and the current time.
3. The denitration system of claim 2, wherein the determining the instantaneous set value according to the concentration of nitrogen oxides at the clean flue gas outlet of the SCR denitration device, the preset value of the mean value of the concentration, the preset sampling period of the concentration and the current time comprises: calculating the instantaneous set value using the following formula:
Figure FDA0002802439350000011
wherein:
a is the preset value of the concentration mean value;
b is the concentration of nitrogen oxides at a clean flue gas outlet of the SCR denitration device;
c is the preset concentration sampling period in seconds;
d is the current time, and the unit is second;
e is the instantaneous set value.
4. The denitration system of claim 3, wherein the preset concentration mean value is a preset one-hour concentration mean value determined according to environmental assessment indicators.
5. The denitration system of claim 1, wherein the ammonia injection flow rate determining unit specifically comprises: and an ammonia injection flow determining unit of the multivariable predictive control model.
6. The denitration system of claim 1, wherein determining a target ammonia injection flow rate according to the concentrations of nitrogen oxides at the SCR outlets on both sides of the SCR denitration device or the concentrations of nitrogen oxides at the SCR inlets on both sides, the concentration of nitrogen oxides at the clean flue gas outlet of the SCR denitration device, and the instantaneous set value specifically comprises:
and determining a target ammonia injection flow according to the concentrations of nitrogen oxides at SCR outlets at two sides of the SCR denitration device or the concentrations of nitrogen oxides at SCR inlets at two sides of the SCR denitration device, the concentration of nitrogen oxides at a clean flue gas outlet of the SCR denitration device, a first ammonia injection flow and the instantaneous set value, wherein the first ammonia injection flow is determined according to the actual load power of a unit connected with the denitration system.
7. The denitration system of claim 6, wherein the first ammonia injection flow rate is determined by inputting the actual load power to a model between a plant load power and an ammonia injection amount.
8. The denitration system of claim 1, wherein the valve opening determining unit specifically comprises: a valve opening determining unit of a multivariable predictive control model or a PID ammonia spraying flow determining unit.
9. The denitration system of claim 1, wherein a nitrogen oxide concentration measuring device is provided at a clean flue gas outlet of the SCR denitration device, and the nitrogen oxide concentration measuring device is connected to the set value dynamic programming module.
10. The denitration system according to claim 1, wherein nitrogen oxide concentration measuring devices are respectively provided at SCR outlets on both sides of the SCR denitration device, or nitrogen oxide concentration measuring devices are respectively provided at SCR inlets on both sides of the SCR denitration device, and the nitrogen oxide concentration measuring devices provided at the SCR outlets or inlets on both sides of the SCR denitration device are respectively connected to the ammonia injection flow rate determination unit.
CN202011355325.3A 2020-11-26 2020-11-26 Denitration system Pending CN112403262A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011355325.3A CN112403262A (en) 2020-11-26 2020-11-26 Denitration system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011355325.3A CN112403262A (en) 2020-11-26 2020-11-26 Denitration system

Publications (1)

Publication Number Publication Date
CN112403262A true CN112403262A (en) 2021-02-26

Family

ID=74842665

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011355325.3A Pending CN112403262A (en) 2020-11-26 2020-11-26 Denitration system

Country Status (1)

Country Link
CN (1) CN112403262A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113360844A (en) * 2021-04-27 2021-09-07 国能南京电力试验研究有限公司 Method for calculating small-hour mean value of NOx concentration of composite chimney by weighting coefficient method
CN115318096A (en) * 2022-07-18 2022-11-11 华能曲阜热电有限公司 Automatic ammonia injection amount adjusting method and system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55106526A (en) * 1979-02-08 1980-08-15 Sumitomo Heavy Ind Ltd Removing method for nitrogen oxide and sulfur oxide from waste gas
CN108310973A (en) * 2018-03-29 2018-07-24 中国神华能源股份有限公司 Automatic ammonia-gas spraying device and coal fired power plant flue gas system
CN207928976U (en) * 2017-12-30 2018-10-02 光力科技股份有限公司 A kind of SCR denitration spray ammonia regulator control system with feedforward measurement links
CN108837692A (en) * 2018-06-27 2018-11-20 广东电网有限责任公司 A kind of control method, system and the storage medium of boiler smoke purification of nitrogen oxides
CN111966060A (en) * 2020-07-23 2020-11-20 湖南大唐节能科技有限公司 SCR ammonia injection control optimization method, device, equipment and storage medium

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55106526A (en) * 1979-02-08 1980-08-15 Sumitomo Heavy Ind Ltd Removing method for nitrogen oxide and sulfur oxide from waste gas
CN207928976U (en) * 2017-12-30 2018-10-02 光力科技股份有限公司 A kind of SCR denitration spray ammonia regulator control system with feedforward measurement links
CN108310973A (en) * 2018-03-29 2018-07-24 中国神华能源股份有限公司 Automatic ammonia-gas spraying device and coal fired power plant flue gas system
CN108837692A (en) * 2018-06-27 2018-11-20 广东电网有限责任公司 A kind of control method, system and the storage medium of boiler smoke purification of nitrogen oxides
CN111966060A (en) * 2020-07-23 2020-11-20 湖南大唐节能科技有限公司 SCR ammonia injection control optimization method, device, equipment and storage medium

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
杨震力等: ""基于净烟气NOX浓度小时均值设定值的SCR智能控制优化"", 《浙江电力》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113360844A (en) * 2021-04-27 2021-09-07 国能南京电力试验研究有限公司 Method for calculating small-hour mean value of NOx concentration of composite chimney by weighting coefficient method
CN115318096A (en) * 2022-07-18 2022-11-11 华能曲阜热电有限公司 Automatic ammonia injection amount adjusting method and system

Similar Documents

Publication Publication Date Title
CN109304086B (en) Power station boiler SCR denitration refined ammonia injection control method
CN112403262A (en) Denitration system
CN108380043B (en) Selective ammonia injection regulation control method for SCR (Selective catalytic reduction) denitration device
CN105597537B (en) Denitration control method based on Prediction and Control Technology
US7813819B2 (en) Control system for control subject having combustion unit and control system for plant having boiler
CN104607042B (en) A kind of SCR denitration system and method based on constrained forecast control
CN105045089A (en) Boiler denitration control method based on outlet NOx content control and system thereof
CN101842148B (en) Adaptive control system for reagent distribution control in scr reactors
CN105700576B (en) SCR denitration Optimal Control System and method based on the prediction of multivariable Operations of Interva Constraint
CN104722203A (en) SCR denitration control system and SCR denitration control method of heating furnace flue gas
CN107952353A (en) A kind of flue gas purification system and its control method
CN104633698A (en) System and method for automatically controlling content of residual oxygen in regenerative heating furnace
CN101303595A (en) Open ring fuzzy control system for wet process FGD system
CN110618706A (en) Multistage intelligent denitration online optimization control system based on data driving
CN112221347A (en) Accurate ammonia injection control method for SCR denitration system
Zhang et al. MPC case study on a selective catalytic reduction in a power plant
CN111880504A (en) Intelligent dynamic partition ammonia injection control method and system
CN104793652A (en) Load dispatch curve based ammonia injection quantity adjustment method and system
CN109833773B (en) Efficient denitration ammonia flow accurate control method
CN108919845B (en) Automatic control method for nitrogen oxide concentration of denitration system
CN111489605A (en) Ammonia spraying optimization control simulation system based on Simulink and WinCC
CN113970937A (en) SCR denitration accurate ammonia injection control method
CN109046021B (en) SCR system accurate ammonia injection control method with strong self-adaptive capacity
CN113578007A (en) Coal-fired flue gas SCR denitration regulation and control system and method based on partitioned ammonia injection
US8557207B2 (en) Method and apparatus for reducing the quantity of pollutant in waste gases

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20210226

RJ01 Rejection of invention patent application after publication