CN110280133A - Spray ammonia control method, device and the SCR system of SCR system - Google Patents
Spray ammonia control method, device and the SCR system of SCR system Download PDFInfo
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- CN110280133A CN110280133A CN201910597051.XA CN201910597051A CN110280133A CN 110280133 A CN110280133 A CN 110280133A CN 201910597051 A CN201910597051 A CN 201910597051A CN 110280133 A CN110280133 A CN 110280133A
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- 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
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- 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
- B01D53/90—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
This application discloses spray ammonia control method, device and the SCR systems of SCR system.This method comprises: the exit gas temperature of detection SCR system；Judge whether the exit gas temperature is greater than or equal to preset temperature threshold, the preset temperature threshold is determined according to the active temperature of ammonia and the redox reaction catalyst of nitrogen oxides in effluent；If so, carrying out spray ammonia into flue gas.Since the exit gas temperature of SCR system is able to reflect out the temperature of catalyst, spray ammonia is controlled by exit gas temperature, is able to solve the problems of the prior art.
Description
Technical field
This application involves thermal control technology field more particularly to spray ammonia control method, device and the SCR systems of SCR system
System.
Background technique
The coal-burning boiler in thermal power plant generallys use selective catalytic reduction system operating (Selective Catalytic
Reduction, SCR system), denitration is carried out to the flue gas containing nitrogen oxides.It is first during carrying out denitration to flue gas
The mixture of ammonia or ammonia and other gases is first subjected to spray ammonia into flue gas as reducing agent, then by catalyst come pair
The redox reaction of ammonia and nitrogen oxides is catalyzed, to generate the substances such as nitrogen and water.
However, catalyst is larger by reaction temperatures affect to the catalytic activity of the redox reaction, in catalyst
Spray ammonia is carried out into flue gas under the conditions of the lower temperature of activity, at this time since redox reaction rate is slower, will lead to reduction
A large amount of wastes of agent resource.Therefore, how the technology that control is solution required for the application is carried out to the spray ammonia of SCR system to ask
Topic.
Summary of the invention
The embodiment of the present application provides spray ammonia control method, device and the SCR system of SCR system, can be used in the prior art
The problems in.
The embodiment of the present application provides a kind of spray ammonia control method of SCR system, this method comprises:
Detect the exit gas temperature on SCR system exiting flue gas pipeline；
Judge whether the exit gas temperature is greater than or equal to preset temperature threshold, the preset temperature threshold is according to ammonia
The active temperature of the redox reaction catalyst of gas and nitrogen oxides in effluent determines；
If so, carrying out spray ammonia into flue gas.
The embodiment of the present application provides the spray ammonia control method of another SCR system, the exiting flue gas pipeline of the SCR system
In include multiple temperature detecting points, this method comprises:
It determines in detection temperature that each temperature detecting point detects respectively, more than or equal to the detection temperature of preset temperature threshold
The quantity or accounting of degree, the preset temperature threshold is according to the redox reaction catalyst of ammonia and nitrogen oxides in effluent
Active temperature is determined；
When the quantity or accounting meet preset condition, spray ammonia is carried out into flue gas, wherein the quantity or accounting are full
Sufficient preset condition specifically includes: the accounting is greater than or equal to default accounting or the quantity is greater than or equal to preset quantity.
The embodiment of the present application provides a kind of spray ammonia control device of SCR system characterized by comprising acquisition module,
Judgment module and spray ammonia control module, in which:
Module is obtained, for obtaining the exit gas temperature on SCR system exiting flue gas pipeline；
Judgment module, it is described default for judging whether the exit gas temperature is greater than or equal to preset temperature threshold
Temperature threshold is determined according to the active temperature of ammonia and the redox reaction catalyst of nitrogen oxides in effluent；
Ammonia control module is sprayed, for when the exit gas temperature is greater than or equal to preset temperature threshold, control to be opened
The spray ammonia valve door of the SCR system carries out spray ammonia into flue gas.
The embodiment of the present application provides the spray ammonia control device of another SCR system, the exiting flue gas pipeline of the SCR system
In include multiple temperature detecting points, the device comprise determining that module and spray ammonia control module, in which:
Determining module is greater than or equal to default temperature for determining in detection temperature that each temperature detecting point detects respectively
Spend the quantity or accounting of the detection temperature of threshold value, the preset temperature threshold according to the oxidation of ammonia and nitrogen oxides in effluent also
The active temperature of former catalysts is determined；
Ammonia control module is sprayed, for when the quantity or accounting meet preset condition, the SCR system to be opened in control
Spray ammonia valve door carries out spray ammonia into flue gas, wherein the quantity or accounting meet preset condition and specifically include: the accounting is greater than
Or it is equal to default accounting or the quantity more than or equal to preset quantity.
The embodiment of the present application provides a kind of SCR system characterized by comprising for being passed through the inlet flue gas of flue gas
Pipeline, exiting flue gas pipeline, is set to urging for the exiting flue gas pipeline at the spray ammonia valve door for being set to the inlet flue gas pipeline
Agent, spray ammonia control device and the one or more temperature detecting points for being set to the exiting flue gas pipeline, in which:
The spray ammonia control device, for one or more temperature detecting points by being set to the exiting flue gas pipeline
Detection temperature the spray ammonia valve door is controlled.
The embodiment of the present application use at least one above-mentioned technical solution can reach it is following the utility model has the advantages that
The application implements the exit gas temperature by detection SCR system, and by the exit gas temperature and preset temperature
Threshold value compares, and the preset temperature threshold is according to the activity of ammonia and the redox reaction catalyst of nitrogen oxides in effluent
Temperature is determined, and spray ammonia is carried out into flue gas when exit gas temperature is greater than or equal to preset temperature threshold.Due to SCR system
The exit gas temperature of system is able to reflect out the temperature of catalyst, therefore is controlled by exit gas temperature spray ammonia,
It is able to solve the problems of the prior art.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present application, constitutes part of this application, this Shen
Illustrative embodiments and their description please are not constituted an undue limitation on the present application for explaining the application.In the accompanying drawings:
Fig. 1 is a kind of concrete structure schematic diagram of SCR system provided by the embodiments of the present application；
Fig. 2 is the specific knot of multiple temperature detecting points provided by the embodiments of the present application set-up mode on exiting flue gas pipeline
Structure schematic diagram；
Fig. 3 is a kind of flow diagram of the spray ammonia control method of SCR system provided by the embodiments of the present application；
Fig. 4 is the flow diagram of the spray ammonia control method of another SCR system provided by the embodiments of the present application；
Fig. 5 is a kind of concrete structure schematic diagram of the spray ammonia control device of SCR system provided by the embodiments of the present application；
Fig. 6 is the concrete structure schematic diagram of the spray ammonia control device of another SCR system provided by the embodiments of the present application.
Specific embodiment
To keep the purposes, technical schemes and advantages of the application clearer, below in conjunction with the application specific embodiment and
Technical scheme is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the application one
Section Example, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall in the protection scope of this application.
Below in conjunction with attached drawing, the technical scheme provided by various embodiments of the present application will be described in detail.
As previously mentioned, the mixture of ammonia or ammonia and other gases is subjected to spray ammonia as reducing agent in SCR system,
To realize denitration by the redox reaction of ammonia and nitrogen oxides.However, urging during the redox reaction
The catalytic activity of agent is larger by reaction temperatures affect, carries out under the conditions of catalyst activity lower temperature into flue gas
It sprays ammonia and will lead to a large amount of wastes of reducing agent resource at this time since redox reaction rate is slower.
For example, the active temperature of the catalyst of the redox reaction is to be lower than 300 degree or high between 300 degree to 420 degree
Under the conditions of 420 degree of temperature, catalyst is lower to the catalytic activity of redox reaction.If being lower than 300 degree or being higher than
Spray ammonia is carried out under the conditions of 420 degree of temperature, since reaction rate is slower, reaction is not thorough, so as to cause a large amount of reducing agent money
The waste in source.
Embodiment 1
Based on this, the embodiment of the present application 1 provides a kind of SCR system, can be used in solving the problems of the prior art.It should
The concrete structure schematic diagram of SCR system 10 is as shown in Figure 1, comprising: inlet flue gas pipeline 11, spray ammonia valve door 12, exiting flue gas pipe
Road 13, the temperature detecting point 14 being arranged on exiting flue gas pipeline 13, wherein temperature set on exiting flue gas pipeline 13 inspection
The quantity of measuring point 14 can be one or more, and be provided with temperature-detecting device in each temperature detecting point 14, from
And the temperature of flue gas can be detected in temperature detecting point 14, which further includes spray ammonia control device 15,
In:
Inlet flue gas pipeline 11 usually connects the coal-burning boiler in thermal power plant, contains nitrogen oxidation caused by coal-burning boiler
The flue gas of object can enter SCR system 10 by the inlet flue gas pipeline 11.In addition it usually can also be wrapped on inlet flue gas pipeline 11
Include expansion joint 111.
Spray ammonia valve door 12 is additionally provided on inlet flue gas pipeline 11, it can be by opening the spray ammonia valve door 12 come into flue gas
Spray ammonia is carried out, or stops spraying ammonia into flue gas by closing the spray ammonia valve door 12.
Exiting flue gas pipeline 13 for the flue gas after denitration to be discharged, can be provided on exiting flue gas pipeline 13 one group or
Multiple groups catalyst 16, and in exiting flue gas pipeline 13, each temperature detecting point 14 is arranged at the cigarette after catalyst 16
On road, so that the flue gas containing nitrogen oxides is after the catalytic denitration of catalyst 16, then by temperature detecting point 14
Temperature-detecting device detect temperature.
Wherein the set-up mode of multiple groups catalyst 16 can be, and successively equally spacedly be set along Y direction in Fig. 1
It sets.
The set-up mode of multiple temperature detecting points 14 can be on the flue after each catalyst 16, along Y-axis side
To being successively equally spacedly configured；It is also possible to equally spacedly be configured on the peripheral wall of flue circumference, is illustrated in figure 2
4 temperature detecting points 14 being arranged on the peripheral wall of rectangular flue.
It may include connecting pipe 17 between inlet flue gas pipeline 11 and exiting flue gas pipeline 13, for being connected to entrance cigarette
Feed channel 11 and exiting flue gas pipeline 13, so as to lead the flue gas containing nitrogen oxides being passed through in inlet flue gas pipeline 11
Enter to exiting flue gas pipeline 13.
It on the other hand, can be by the flue gas containing nitrogen oxides, with spray 12 institute of ammonia valve door by increasing the connecting pipe 17
The ammonia or ammonia of penetrating and the mixed gas of other gases, are sufficiently mixed, thus by abundant in the connecting pipe 17
Mixed gas is directed into exiting flue gas pipeline 13, so after fully mixed, enables to the nitrogen in ammonia and flue gas
Oxygen compound reaction is more abundant, improves the effect of denitration.In addition, can also include expansion joint 171 in the connecting pipe 17.
The spray ammonia control device 15 on SCR system 10 passes through one or more set on exiting flue gas pipeline 13
The detection temperature of temperature detecting point 14, so that opening or closing for spray ammonia valve door 12 is controlled, to realize the control to spray ammonia.
The specific implementation that spray ammonia control device 15 controls spray ammonia by the detection temperature can be by a variety of, such as can
One to be realized by the way of following:
Mode one: spray ammonia control device 15 is determined to export from the detection temperature of one or more temperature detecting points 14
Flue-gas temperature, and the exit gas temperature is compared with preset temperature threshold, when exit gas temperature is greater than or equal in advance
If when temperature threshold, spray ammonia valve door 12 is opened in the spray control of ammonia control device 15, spray ammonia is carried out into flue gas.
Wherein, which can be according to the catalyst of the redox reaction of ammonia and nitrogen oxides in effluent
Active temperature determine.It usually can be by the lower limit value of the active temperature of catalyst, or close to some value of lower limit value
It is determined as preset temperature threshold, it can also be in conjunction with actual conditions, such as the size of catalyst amount, the thermal capacitance of catalyst, catalysis
The characteristics such as the quality or volume of agent choose some temperature as preset temperature threshold, usual catalyst amount from active temperature
Bigger, the thermal capacitance of catalyst is higher, and the quality of catalyst is bigger or volume is bigger, illustrates heat required for heating catalyst
It is higher, relatively high temperature can be chosen from active temperature at this time as the preset temperature threshold.
For example, the active temperature of catalyst be 300 degree to 420 degree between, can choose 300 degree or with 300 degree more
Some close temperature value (such as 310 degree etc.) is used as preset temperature threshold.When the dosage of the catalyst is larger or thermal capacitance is higher
When, some relatively high temperature (such as 320 degree etc.) can also be chosen as preset temperature threshold.
The catalytic capability of catalyst is usually described with catalytic activity, various catalyst all have certain activity strongest
This temperature range is usually referred to as the active temperature of catalyst by temperature range.
When being only provided with a temperature detecting point 14 on exiting flue gas pipeline 13, spray ammonia control device 15 can directly by
The detection temperature of the temperature detecting point 14 is determined as exit gas temperature.
When being provided with multiple temperature detecting points 14 on exiting flue gas pipeline 13, spray ammonia control device 15 can be by each temperature
Spend the minimum temperature detected by test point 14 in detection temperature, be determined as exit gas temperature, can also by it is therein most
High-temperature is determined as exit gas temperature, can also first calculate being averaged for the detection temperature that each temperature detecting point 14 detects respectively
Value, and the average value is determined as exit gas temperature.
Minimum temperature, maximum temperature or average value are determined as exit gas temperature, three kinds of determining exit gas temperatures
In mode, the mode of maximum temperature can carry out spray ammonia later, to more save reducing agent resource, the mode of minimum temperature
Spray ammonia can be carried out earlier, to improve flue gas denitrification equipment devoting rate, the mode of average value falls between, in reality
In, it can choose according to specific needs.
It is, of course, also possible to the detection temperature of any one test point is determined as exit gas temperature, such as at random from each
A detection temperature is extracted in the detection temperature of a temperature detecting point 14, and determines it as exit gas temperature.
After determining exit gas temperature, it is compared with preset temperature threshold, when exit gas temperature is big
When preset temperature threshold, illustrate that the temperature of catalyst has reached active temperature, spray ammonia control can be passed through at this time
Spray ammonia valve door 12 is opened in the control of device 15, and spray ammonia is carried out into flue gas.The ammonia of flue gas and penetrating containing oxynitrides or
The mixture of ammonia and other gases passes through the catalysis of catalyst under active temperature, is able to carry out redox reaction and gives birth to
At nitrogen, to realize denitration.
When being provided with multiple temperature detecting points 14 in the exiting flue gas pipeline 13 of SCR system, spray ammonia control device 15 is also
Can by the way of following two come realize spray ammonia control:
Mode two: the detected detection temperature of each difference of temperature detecting point 14 in acquisition exiting flue gas pipeline 13, and from
The quantity or accounting that the detection temperature more than or equal to preset temperature threshold is determined in these detection temperature, when the quantity or account for
When than meeting preset condition, such as when the quantity for the detection temperature for being greater than or equal to preset temperature threshold is greater than or equal to present count
Amount, or when being greater than or equal to the accounting of detection temperature of preset temperature threshold more than or equal to default accounting, illustrate to be catalyzed
The temperature of agent has reached active temperature, spray ammonia valve door 12 can be opened by the spray control of ammonia control device 15 at this time, to flue gas
In carry out spray ammonia.The ammonia of flue gas and penetrating containing oxynitrides or the mixture of ammonia and other gases, in active temperature
The lower catalysis by catalyst of degree, is able to carry out redox reaction and generates nitrogen, to realize denitration.
For example, being provided with 8 temperature detecting points, preset quantity 3 in exiting flue gas pipeline 13.When this 8 temperature detections
When thering is the detection temperature of 3 or 3 or more temperature detecting points to be greater than or equal to preset temperature threshold in point, ammonia control device is sprayed
15 can control unlatching spray ammonia valve door 12, and spray ammonia is carried out into flue gas.
8 temperature detecting points are provided in exiting flue gas pipeline 13, presetting accounting is 30%.When this 8 temperature detecting points
In, when the accounting for the temperature detecting point that detection temperature is greater than or equal to preset temperature threshold is more than 30%, spray ammonia control device 15
It can control unlatching spray ammonia valve door 12, spray ammonia carried out into flue gas
It should be further noted that being greater than or equal to default temperature in the detection temperature for determining each temperature detecting point 14
When spending the accounting of the detection temperature of threshold value, the quantity of the detection temperature more than or equal to preset temperature threshold can be counted, and will
The quantity is divided by the quantity of temperature detecting point 14, to calculate the accounting, the calculation is relatively simple, in temperature detecting point
When 14 negligible amounts, cost is relatively low for realization.
But when the quantity of temperature detecting point 14 is more, in the detection temperature that counts each temperature detecting point 14, it is greater than
Or it is more inconvenient equal to the quantity of the detection temperature of preset temperature threshold.At this point it is possible to be detected respectively from each temperature detecting point
Detection temperature in randomly select multiple detection temperature, then calculate in the multiple detection temperature randomly selected, be greater than or equal to
The accounting of the detection temperature of preset temperature threshold, and the calculated accounting of institute is determined as each temperature detecting point and is detected respectively
Detection temperature in, more than or equal to the accounting of the detection temperature of preset temperature threshold.Which is due to by randomly selecting
Mode chooses multiple detection temperature, therefore efficiency is higher, is more applicable in a fairly large number of situation of temperature detecting point 14.
In addition, the quantity of the detection temperature randomly selected can basis from the detection temperature of each temperature detecting point 14
The quantity of temperature detecting point 14 determines, for example from each temperature detecting point 14, randomly selects a certain proportion of detection temperature,
In certain practical application the quantity randomly selected can also be determined using other modes.
Using SCR system 10 provided by the embodiment of the present application 1, spray ammonia control device 15 in the SCR system 10 passes through
The detection temperature of temperature detecting point 14 on exiting flue gas pipeline 13 is set, so that the unlatching for controlling spray ammonia valve door 12 comes to spray
Ammonia is controlled.Since the detection temperature of the temperature detecting point 14 on exiting flue gas pipeline 13 can embody the temperature of catalyst
Degree, therefore spray ammonia is controlled according to the detection temperature, it is able to solve problem of the prior art.
In contrast, the flue gas in inlet flue gas pipeline 11 is due to also needing by connecting pipe 17, when flue gas reaches out
When catalyst 16 in mouthful flue 13, flue-gas temperature may have greatly changed, therefore relative to by temperature detection
Point is set to inlet flue gas pipeline, and temperature detecting point is set to exiting flue gas pipeline by the application, due in exiting flue gas pipeline
Flue gas be more able to reflect source in the flue-gas temperature of catalyst area, therefore can preferably control spray ammonia, realize resource section
The effect of province.
In practical applications, the spray ammonia control device 15 in SCR system 10 can also control closing spray ammonia valve door 12, from
And stop carrying out spray ammonia.Wherein, the mode that spray ammonia valve door 12 is closed in the control of spray ammonia control device 15 may include following several:
Mode one: when exit gas temperature is greater than the second preset temperature threshold, spray is closed in the spray control of ammonia control device 15
Ammonia valve door 12 stops carrying out spray ammonia into flue gas.Wherein, which can be according to nitrogen oxygen in ammonia and flue gas
The active temperature of the redox reaction catalyst of compound is determined, and the second preset temperature threshold is greater than preset temperature threshold
Value.
Usually it can be determined as second by the upper limit value of the active temperature of catalyst, or close to some value of upper limit value
Preset temperature threshold.For example, the active temperature of catalyst be 300 degree to 420 degree between, can choose 420 degree or with 420 degree
Some temperature value (such as 410 degree etc.) being closer to is used as the second preset temperature threshold.
Can be combined with actual conditions when choosing the second preset temperature threshold certainly, for example, catalyst amount size, urge
The characteristics such as the thermal capacitance of agent, the quality of catalyst or volume choose some temperature as the second preset temperature from active temperature
Threshold value.
Mode two: when being provided with multiple temperature detecting points 14 in the exiting flue gas pipeline 13 of SCR system 10, can first from
In the detection temperature that these temperature detecting points 14 detect respectively, the detection more than or equal to the second preset temperature threshold is determined
The quantity or accounting of temperature, and when the quantity or accounting meet the second preset condition, illustrate that the temperature of catalyst has connect
It is bordering on or stops at this point, spray ammonia control device 15 can control closing spray ammonia valve door 12 to cigarette more than the upper limit value of active temperature
Spray ammonia is carried out in gas.
Here quantity or accounting, which meets the second preset condition, can be, more than or equal to the inspection of the second preset temperature threshold
The quantity of testing temperature is greater than or equal to the second preset quantity, or accounts for more than or equal to the detection temperature of the second preset temperature threshold
Than being greater than or equal to the second default accounting.According to actual needs, the second preset quantity here can be with above-mentioned preset quantity
Identical or different, the second default accounting can also be identical or different with above-mentioned default accounting.
Mode three: as shown in connection with fig. 1, increase one or more entrance temperature in the inlet flue gas pipeline 11 of SCR system 10
Test point 18 is spent, the entrance flue gas temperature detected by the inlet temperature test point 18 is greater than or equal to the second preset temperature threshold
When, spray ammonia valve door 12 is closed in the spray control of ammonia control device 15, stops carrying out spray ammonia into flue gas.
Wherein, one or more inlet temperature test points 18 detect entrance flue gas temperature mode can there are many, than
Such as when only one inlet temperature test point 18, directly using the detection temperature detected by it as entrance flue gas temperature.When
It, can be by the minimum temperature, most in the detection temperature of each inlet temperature test point 18 when having multiple inlet temperature test points 18
High-temperature or the average value for detecting temperature can also randomly select wherein some inlet temperature inspection as entrance flue gas temperature
The detection temperature of measuring point 18 is as entrance flue gas temperature.For the method for determination of entrance flue gas temperature, exiting flue gas can be referred to
Temperature here just repeats no more this.
It should be noted that exit gas temperature is better able to reflect the temperature of catalyst, and entrance flue gas temperature is more
It is able to reflect out the temperature for the flue gas being passed through, therefore can more accurately be detected and be passed through by inlet temperature test point 18
It is unstable to be likely to result in catalyst structure when being passed through flue gas when the temperature is excessively high for the temperature of flue gas, so that it is living to influence catalyst
Property.It therefore can be using the second preset temperature threshold as the datum mark of entrance flue gas temperature, when entrance flue gas temperature reaches the base
When on schedule, stop spray ammonia.
Mode four:, can also when being provided with multiple inlet temperature test points 18 in the inlet flue gas pipeline 11 of SCR system 10
With elder generation from the detection temperature that these inlet temperature test points 18 detect respectively, determine to be greater than or equal to the second preset temperature
The quantity or accounting of the detection temperature of threshold value, and when the quantity or accounting meet the second preset condition, also illustrate catalyst
Temperature already close to or more than active temperature upper limit value, at this point, spray ammonia control device 15 can control closing spray ammonia valve
Door 12, stops carrying out spray ammonia into flue gas.
Mode five: when being provided with one or more inlet temperature test points 18 in the inlet flue gas pipeline 11 of SCR system 10,
It, can also be by spraying ammonia control device 15 and when temperature detecting point 18 detects that entrance flue gas temperature is less than preset temperature threshold
Spray ammonia valve door 12 is closed in control, stops carrying out spray ammonia into flue gas.
It should be noted that the structure of above-mentioned combination SCR system 10 provided herein, describes two kinds of controls respectively
It opens spray ammonia valve door 12 and carries out the mode of spray ammonia, and describe five kinds of controls and close the mode that spray ammonia valve door 12 stops spray ammonia,
Any one of the above can be controlled to the spray ammonia mode for opening spray ammonia valve door in practical applications and spray is closed in any one control
Ammonia valve door stopping spray ammonia mode combine, thus realize to spray ammonia and stop spray ammonia control, here just no longer to they
Specific combination is illustrated.
Embodiment 2
Based on inventive concept same as Example 1, embodiments herein 2 provides a kind of spray ammonia control of SCR system
Method processed also can be used in solving the problems of the prior art.Wherein, it for not knowing place in the embodiment 2, can refer to
Related content in embodiment 1.Spray ammonia control method provided by the embodiment 2 can be carried out in conjunction with Fig. 1 and Fig. 3 below
Illustrate:
Step S201: the exit gas temperature of SCR system is detected.
It can be by one or more temperature detecting points 14 set on SCR system exiting flue gas pipeline 13, to detect
Exit gas temperature out, such as when a temperature detecting point 14 only is arranged on exiting flue gas pipeline 13, it can be directly by the temperature
Detection temperature detected by test point 14 is spent as exit gas temperature.
It, can be by the inspection of each temperature detecting point 14 when being provided with multiple temperature detecting points 14 on exiting flue gas pipeline 13
The average value for the detection temperature that minimum temperature, maximum temperature or each temperature detecting point 14 in testing temperature detect respectively is made
For detected exit gas temperature.One can certainly be randomly selected from the detection temperature of multiple temperature detecting points 14
It is a, as exit gas temperature.
In addition, from the opportunity of detection exit gas temperature it is upper for, can be by set on exiting flue gas pipeline 13
One or more temperature detecting points 14 carry out real-time monitoring to the temperature of exiting flue gas, thus real-time detect SCR system
Exit gas temperature, which can monitor the temperature change of exiting flue gas in real time, to realized more quickly to spray ammonia
The control of process.
Can also periodically detect the exit gas temperature of SCR system, for example, every 1 minute (be also possible to 5 minutes or
The other times period) detection 1 time, this mode is more applicable in the case where the temperature change of exiting flue gas is relatively slow, and by
It is lower in detection frequency, it can reduce cost.
Step S202: judging whether exit gas temperature is greater than or equal to preset temperature threshold, if so, thening follow the steps
S203。
Step S203: spray ammonia is carried out into flue gas.
Wherein, the preset temperature threshold is identical as the preset temperature threshold in embodiment 1, just repeats no more here.In addition,
When judging that exit gas temperature is less than preset temperature threshold, spray ammonia can not be carried out into flue gas, or control with others
Mode processed combines, to control spray ammonia.
When detected exit gas temperature be greater than or equal to preset temperature threshold, reflected the temperature of catalyst
Reach active temperature, spray ammonia can be carried out into flue gas at this time.
Using ammonia control method is sprayed provided by the embodiment of the present application 2, since this method uses hair same as Example 1
Bright design, therefore also it is able to solve the problems of the prior art.
It should be noted that the executing subject of each step of 2 providing methods of embodiment may each be same equipment or mould
Block, alternatively, each step of this method can also be by distinct device or module as executing subject.For example, step S201 executes master
Body can be one or more temperature detecting points 14 set on exiting flue gas pipeline 13；For another example, the execution of step S202
Main body can spray ammonia control device 15 for SCR system；Etc..
In practical applications, when being provided with multiple temperature detecting points 14 on the exiting flue gas pipeline 13 of SCR system 10, knot
It closes shown in Fig. 1 and Fig. 4, the embodiment of the present application can also provide the spray ammonia control method of another SCR system, and this method includes
Following steps:
Step S301: the set temperature for being equipped with multiple temperature detecting points on detection SCR system exiting flue gas pipeline.
Step S302: determining in detection temperature that each temperature detecting point detects respectively, is greater than or equal to preset temperature threshold
The quantity or accounting of the detection temperature of value.
Step S303: when the quantity or accounting meet preset condition, spray ammonia is carried out into flue gas.
Wherein, it may include: that the accounting is greater than or equal to default accounting or the number that the quantity or accounting, which meet preset condition,
Amount is greater than or equal to preset quantity.
The mode that several controls stop spray ammonia can also be provided here:
Mode one: when exit gas temperature is greater than the second preset temperature threshold, stop carrying out spray ammonia into flue gas.Its
In, the exit gas temperature and the second preset temperature threshold are same as Example 1, no longer illustrate here.
Mode two: when being provided with multiple temperature detecting points 14 in the exiting flue gas pipeline 13 of SCR system 10, can first from
In the detection temperature that these temperature detecting points 14 detect respectively, the detection more than or equal to the second preset temperature threshold is determined
The quantity or accounting of temperature, and when the quantity or accounting meet the second preset condition, illustrate that the temperature of catalyst has connect
Be bordering on or more than active temperature upper limit value, stop carrying out spray ammonia into flue gas.
Mode three: increasing one or more inlet temperature test points 18 in the inlet flue gas pipeline 11 of SCR system 10, when
When entrance flue gas temperature detected by inlet temperature test point 18 is greater than or equal to the second preset temperature threshold, spray ammonia control dress
It sets 15 controls and closes spray ammonia valve door 12, stop carrying out spray ammonia into flue gas.
Mode four:, can also when being provided with multiple inlet temperature test points 18 in the inlet flue gas pipeline 11 of SCR system 10
With elder generation from the detection temperature that these inlet temperature test points 18 detect respectively, determine to be greater than or equal to the second preset temperature
The quantity or accounting of the detection temperature of threshold value, and when the quantity or accounting meet the second preset condition, also illustrate catalyst
Temperature already close to or more than active temperature upper limit value, stop carrying out spray ammonia into flue gas.
Mode five: being equipped with one or more inlet temperature test points 18 set by the inlet flue gas pipeline 11 of SCR system 10,
When detected entrance flue gas temperature is less than preset temperature threshold, spray ammonia valve can also be closed by the spray control of ammonia control device 15
Door 12, stops carrying out spray ammonia into flue gas.
Embodiment 3
Based on inventive concept identical with Examples 1 and 2, embodiment 3 provides a kind of spray ammonia control dress of SCR system
It sets.As shown in figure 5, the spray ammonia control device 40 includes: to obtain module 401, judgment module 402 and spray ammonia control module 403,
In:
Module 401 is obtained, for obtaining the exit gas temperature of the SCR system detected, which is used for
Reflect the temperature of catalyst used in the redox reaction of ammonia and nitrogen oxides in effluent；
Judgment module 402, it is described pre- for judging whether the exit gas temperature is greater than or equal to preset temperature threshold
If temperature threshold is determined according to the active temperature of ammonia and the redox reaction catalyst of nitrogen oxides in effluent；
Ammonia control module 403 is sprayed, for when the exit gas temperature is greater than or equal to preset temperature threshold, control to be opened
The spray ammonia valve door for opening the SCR system carries out spray ammonia into flue gas.
The spray ammonia control device 40 as provided by the embodiment 3, using inventive concept identical with Examples 1 and 2,
Therefore the problems of the prior art are also able to solve, just repeated no more here.
In practical applications, which can also include stopping spray ammonia control module, for when outlet cigarette
Temperature degree be greater than the second preset temperature threshold when, stop carrying out spray ammonia into flue gas, the second preset temperature threshold according to ammonia with
The active temperature of the redox reaction catalyst of nitrogen oxides in effluent is determined, and the second preset temperature threshold is greater than institute
State preset temperature threshold；Or, stopping when the entrance flue gas temperature of SCR system is greater than second preset temperature threshold to cigarette
Spray ammonia is carried out in gas.
When being provided with multiple temperature detecting points on the exiting flue gas pipeline of SCR system, obtaining module 401 can be by such as
Any one lower mode, which obtains, detects exit gas temperature: in the detection temperature that each temperature detecting point is detected respectively most
Low temperature, as the exit gas temperature；The maximum temperature in detection temperature that each temperature detecting point is detected respectively is made
For the exit gas temperature；The average value for the detection temperature that each temperature detecting point is detected respectively, as the outlet cigarette
Temperature degree；By the detection temperature of any one test point in each temperature detecting point, as the exit gas temperature.
The embodiment of the present application also provides a kind of spray ammonia control device of SCR system, the wherein exiting flue gas of the SCR system
It include multiple temperature detecting points in pipeline.As shown in fig. 6, the spray ammonia control device 50 comprises determining that module 501 and spray ammonia control
Molding block 502, in which:
Determining module 501 is greater than or equal to default for determining in detection temperature that each temperature detecting point detects respectively
The quantity or accounting of the detection temperature of temperature threshold, the preset temperature threshold is according to the oxidation of ammonia and nitrogen oxides in effluent
The active temperature of reduction catalyst is determined；
Ammonia control module 502 is sprayed, for when the quantity or accounting meet preset condition, the SCR system to be opened in control
The spray ammonia valve door of system carries out spray ammonia into flue gas, wherein the quantity or accounting meet preset condition and specifically include: the accounting
It is greater than or equal to preset quantity more than or equal to default accounting or the quantity.
The spray ammonia control device 50 uses inventive concept identical with Examples 1 and 2, therefore is also able to solve the prior art
The problems in, it just repeats no more here.
Determining module 501 can determine the detection temperature that each temperature detecting point detects respectively in the following way
In, more than or equal to the accounting of the detection temperature of preset temperature threshold: the detection temperature detected respectively from each temperature detecting point
In randomly select multiple detection temperature；It calculates in the multiple detection temperature randomly selected, more than or equal to preset temperature threshold
The accounting of temperature is detected, and the accounting is determined as in the detection temperature that each temperature detecting point detects respectively, is greater than or waits
In the accounting of the detection temperature of preset temperature threshold.
The spray ammonia control device 50 can also include that ammonia control module is sprayed in the second stopping, for distinguishing when each temperature detecting point
In the detection temperature detected, it is pre- to meet second more than or equal to the quantity or accounting of the detection temperature of the second preset temperature threshold
If when condition, stopping carrying out spray ammonia into flue gas, wherein the quantity or accounting meet the second preset condition and specifically include: big
It is greater than or equal to the second preset quantity in or equal to the quantity of detection temperature of the second preset temperature threshold, or is greater than or equal to the
The accounting of the detection temperature of two preset temperature thresholds be greater than or equal to the second default accounting, second preset temperature threshold according to
The active temperature of the redox reaction catalyst of ammonia and nitrogen oxides in effluent is determined, and second preset temperature
Threshold value is greater than the preset temperature threshold.
It should be noted that the terms "include", "comprise" or its any other variant are intended to the packet of nonexcludability
Contain, so that the process, method, commodity or the equipment that include a series of elements not only include those elements, but also including
Other elements that are not explicitly listed, or further include for this process, method, commodity or the intrinsic element of equipment.
In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that in the mistake including element
There is also other identical elements in journey, method, commodity or equipment.
The above is only embodiments herein, are not intended to limit this application.To those skilled in the art,
Various changes and changes are possible in this application.It is all within the spirit and principles of the present application made by any modification, equivalent replacement,
Improve etc., it should be included within the scope of the claims of this application.
Claims (10)
1. a kind of spray ammonia control method of SCR system characterized by comprising
Detect the exit gas temperature on SCR system exiting flue gas pipeline；
Judge whether the exit gas temperature is greater than or equal to preset temperature threshold, the preset temperature threshold according to ammonia with
The active temperature of the redox reaction catalyst of nitrogen oxides in effluent determines；
If so, carrying out spray ammonia into flue gas.
2. the method as described in claim 1, which is characterized in that the method also includes:
When the exit gas temperature is greater than the second preset temperature threshold, stop carrying out spray ammonia into flue gas, described second is pre-
If temperature threshold is determined according to the active temperature of the catalyst, and second preset temperature threshold is greater than the default temperature
Spend threshold value；Or,
When the entrance flue gas temperature of the SCR system is greater than second preset temperature threshold, stop being sprayed into flue gas
Ammonia, the entrance flue gas temperature detect to obtain by the temperature detecting point on the SCR system inlet flue gas pipeline；Or,
When the entrance flue gas temperature of the SCR system is less than the preset temperature threshold, stop carrying out spray ammonia into flue gas.
3. the method as described in claim 1, which is characterized in that include multiple temperature in the exiting flue gas pipeline of the SCR system
Spend test point；Then,
The exit gas temperature, specifically include it is following any one:
The minimum temperature in detection temperature that each temperature detecting point detects respectively；
The maximum temperature in detection temperature that each temperature detecting point detects respectively；
The average value for the detection temperature that each temperature detecting point detects respectively；
The detection temperature of any one test point in each temperature detecting point.
4. a kind of spray ammonia control method of SCR system, which is characterized in that include more in the exiting flue gas pipeline of the SCR system
A temperature detecting point, which comprises
It determines in detection temperature that each temperature detecting point detects respectively, more than or equal to the detection temperature of preset temperature threshold
Quantity or accounting, the preset temperature threshold is according to the activity of ammonia and the redox reaction catalyst of nitrogen oxides in effluent
Temperature is determined；
When the quantity or accounting meet preset condition, spray ammonia is carried out into flue gas, wherein the quantity or accounting meet in advance
If condition specifically includes: the accounting is greater than or equal to default accounting or the quantity is greater than or equal to preset quantity.
5. method as claimed in claim 4, which is characterized in that determine that each temperature detecting point detects respectively by the following method
Detection temperature in, more than or equal to the accounting of the detection temperature of preset temperature threshold:
Multiple detection temperature are randomly selected from the detection temperature that each temperature detecting point detects respectively；
It calculates in the multiple detection temperature randomly selected, more than or equal to the accounting of the detection temperature of preset temperature threshold, and will
The accounting is determined as in the detection temperature that each temperature detecting point detects respectively, more than or equal to the detection of preset temperature threshold
The accounting of temperature.
6. method as claimed in claim 4, which is characterized in that the method also includes:
In the detection temperature that each temperature detecting point detects respectively, more than or equal to the detection temperature of the second preset temperature threshold
Quantity or accounting when meeting the second preset condition, stop carrying out spray ammonia into flue gas, wherein the quantity or accounting meet the
Two preset conditions specifically include: greater than or equal to the quantity of the detection temperature of the second preset temperature threshold to be greater than or equal to second pre-
If quantity, or it is greater than or equal to the second default accounting, institute more than or equal to the accounting of the detection temperature of the second preset temperature threshold
It is true according to the active temperature of ammonia and the redox reaction catalyst of nitrogen oxides in effluent institute to state the second preset temperature threshold
It is fixed, and second preset temperature threshold is greater than the preset temperature threshold.
7. a kind of spray ammonia control device of SCR system characterized by comprising obtain module, judgment module and spray ammonia and control mould
Block, in which:
Module is obtained, for obtaining the exit gas temperature on SCR system exiting flue gas pipeline；
Judgment module, for judging whether the exit gas temperature is greater than or equal to preset temperature threshold, the preset temperature
Threshold value is determined according to the active temperature of ammonia and the redox reaction catalyst of nitrogen oxides in effluent；
Ammonia control module is sprayed, described in when the exit gas temperature is greater than or equal to preset temperature threshold, control is opened
The spray ammonia valve door of SCR system carries out spray ammonia into flue gas.
8. a kind of spray ammonia control device of SCR system, which is characterized in that include more in the exiting flue gas pipeline of the SCR system
A temperature detecting point, described device comprise determining that module and spray ammonia control module, in which:
Determining module is greater than or equal to preset temperature threshold for determining in detection temperature that each temperature detecting point detects respectively
The quantity or accounting of the detection temperature of value, the preset temperature threshold are anti-according to the redox of ammonia and nitrogen oxides in effluent
The active temperature of catalyst is answered to be determined；
Ammonia control module is sprayed, for when the quantity or accounting meet preset condition, the spray ammonia of the SCR system to be opened in control
Valve carries out spray ammonia into flue gas, wherein the quantity or accounting meet preset condition and specifically include: the accounting is greater than or waits
It is greater than or equal to preset quantity in default accounting or the quantity.
9. a kind of SCR system characterized by comprising for being passed through the inlet flue gas pipeline of flue gas, being set to the entrance cigarette
The spray ammonia valve door of feed channel, is set to the exiting flue gas pipeline at the exiting flue gas pipeline connecting with the inlet flue gas pipeline
Catalyst, spray ammonia control device and be set to one or more temperature detecting points of the exiting flue gas pipeline, in which:
The spray ammonia control device, the inspection for one or more temperature detecting points by being set to the exiting flue gas pipeline
Testing temperature controls the spray ammonia valve door.
10. system as claimed in claim 9, which is characterized in that each temperature detecting point is set to the exiting flue gas pipe
Flue after catalyst described in road.
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Application publication date: 20190927 |