CN213423130U - SCR inlet NOx concentration prediction system - Google Patents
SCR inlet NOx concentration prediction system Download PDFInfo
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- CN213423130U CN213423130U CN202022736442.6U CN202022736442U CN213423130U CN 213423130 U CN213423130 U CN 213423130U CN 202022736442 U CN202022736442 U CN 202022736442U CN 213423130 U CN213423130 U CN 213423130U
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- 239000003245 coal Substances 0.000 claims abstract description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000001301 oxygen Substances 0.000 claims abstract description 17
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 17
- 238000004891 communication Methods 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000009123 feedback regulation Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
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Abstract
The utility model discloses a SCR entry NOx concentration prediction system, including first multiplier, first index arithmetic unit, second index arithmetic unit, first function generator, second multiplier, the adder, the subtracter, a weight changer for detecting coal pulverizer belt coal charge, a speed changer for detecting coal pulverizer belt rotational speed, an amount of wind changer for detecting the amount of wind in the coal pulverizer entry primary air main pipe, a wind pressure changer for detecting the primary air pressure in the air preheater export primary air main pipe, a secondary air volume changer for detecting the amount of wind in air preheater secondary outlet department and an oxygen volume changer for detecting SCR entrance oxygen content, NO that this system can accurately predict the SCR entryXAnd (4) concentration.
Description
Technical Field
The utility model belongs to the automatic prediction control field of power plant boiler denitration relates to a SCR entry NOx concentration prediction system.
Background
In China, coal is used as a main energy source, and the energy pattern cannot change for a long time. With the continuous development of new energy industry and the stricter and stricter national environmental protection requirements, the problem of nitrogen oxide emission of coal-fired power plants gradually becomes the key point of attention of people. How to effectively reduce the ammonia injection amount while ensuring the denitration efficiency becomes a problem to be solved urgently at present in the denitration ammonia injection control.
For some units with longer commissioning time, the NO at the inlet of the measuring device, in particular the SCR denitration deviceXThe measuring device may frequently malfunction. Due to failure to obtain accurate and effective SCR inlet NOXConcentration data and the traditional PID feedback regulation mode lose control significance. Therefore, even if various advanced control strategies are successfully applied to the control process of the denitration control system, the control effect still cannot meet the environmental protection assessment requirement.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a SCR entry NOx concentration prediction system, NO that this system can accurate prediction SCR entryXAnd (4) concentration.
In order to achieve the above object, the SCR inlet NOx concentration prediction system of the present invention includes a first multiplier, a first index operator, a second index operator, a first function generator, a second multiplier, an adder, a subtracter, a weight transmitter for detecting the coal amount on the belt of the coal mill, a rotation speed transmitter for detecting the rotation speed of the belt of the coal mill, a primary air volume transmitter for detecting the primary air volume in the primary air main pipe of the coal mill inlet, a primary air pressure transmitter for detecting the primary air pressure in the primary air main pipe of the air preheater outlet, a secondary air volume transmitter for detecting the secondary air volume in the air preheater outlet, and an oxygen volume transmitter for detecting the oxygen amount at the SCR inlet;
the output end of the weight transmitter and the output end of the rotating speed transmitter are connected with the input end of the first multiplier, the output end of the primary air volume transmitter is connected with the input end of the first exponential operator, and the output end of the primary air pressure transmitter is connected with the input end of the second exponential operator; the output end of the secondary air volume transmitter is connected with the input end of the first function generator, and the output end of the oxygen volume transmitter is connected with the input end of the second function generator;
the output end of the first exponential arithmetic unit and the output end of the second exponential arithmetic unit are connected with the input end of the second multiplier, the output end of the first multiplier, the output end of the second multiplier and the output end of the first function generator are connected with the input end of the adder, and the output end of the adder and the output end of the second function generator are connected with the input end of the subtracter.
And the display is connected with the subtracter.
The device also comprises a communication module connected with the subtracter.
The utility model discloses following beneficial effect has:
SCR entry NOx concentration prediction system when concrete operation, utilize the coal volume on the coal pulverizer belt, the rotational speed of coal pulverizer belt, the female intraductal amount of wind of the primary air of coal pulverizer entry, the female intraductal primary air pressure of the primary air of air preheater export, the secondary amount of wind in air preheater exit and the accurate NO prediction SCR entry of the oxygen volume of SCR entranceXConcentration of NOx at SCR inletXWhen a measuring point is in fault, the predicted value can be adopted to replace an original fault signal to participate in the ammonia spraying and denitration control process, the workload of operators is effectively reduced, and the control quality is improved.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a weight transmitter, 2 is a rotating speed transmitter, 3 is a primary air volume transmitter, 4 is a primary air pressure transmitter, 5 is a secondary air volume transmitter, 6 is an oxygen volume transmitter, 7 is a first multiplier, 8 is a first exponential arithmetic unit, 9 is a second exponential arithmetic unit, 10 is a second multiplier, 11 is a first function generator, 12 is a second function generator, 13 is an adder, and 14 is a subtracter.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the SCR inlet NOx concentration prediction system of the present invention includes a first multiplier 7, a first index arithmetic unit 8, a second index arithmetic unit 9, a first function generator 11, a second function generator 12, a second multiplier 10, an adder 13, a subtracter 14, a weight transmitter 1 for detecting the coal amount on the belt of the coal mill, a rotation speed transmitter 2 for detecting the rotation speed of the belt of the coal mill, a primary air volume transmitter 3 for detecting the primary air volume in the primary air main pipe of the coal mill inlet, a primary air pressure transmitter 4 for detecting the primary air pressure in the primary air main pipe of the air preheater outlet, a secondary air volume transmitter 5 for detecting the secondary air volume at the outlet of the air preheater, and an oxygen volume transmitter 6 for detecting the SCR inlet; the output end of the weight transmitter 1 and the output end of the rotating speed transmitter 2 are connected with the input end of a first multiplier 7, the output end of the primary air volume transmitter 3 is connected with the input end of a first exponential operator 8, and the output end of the primary air pressure transmitter 4 is connected with the input end of a second exponential operator 9; the output end of the secondary air volume transmitter 5 is connected with the input end of a first function generator 11, and the output end of the oxygen volume transmitter 6 is connected with the input end of a second function generator 12; the output of the first exponent operator 8 and the output of the second exponent operator 9 are connected to the input of a second multiplier 10, the output of the first multiplier 7, the output of the second multiplier 10 and the output of the first function generator 11 are connected to the input of an adder 13, and the output of the adder 13 and the output of the second function generator 12 are connected to the input of a subtractor 14.
The utility model discloses still include the display that is connected with subtracter 14.
The utility model discloses a concrete working process does:
the weight transmitter 1 and the rotating speed transmitter 2 respectively measure the belt coal quantity and the belt rotating speed in real time, then send the belt coal quantity and the belt rotating speed into the first multiplier 7 for multiplication, send the multiplication result into the adder 13 as the instantaneous total coal quantity, measure the primary air quantity in the primary air main pipe at the inlet of the coal mill in real time through the primary air quantity transmitter 3, input the measured primary air quantity into the first exponential arithmetic unit 8 for primary air quantity correlation fitting operation, and then input the result of the primary air quantity correlation fitting operation into the second multiplier 10; the primary air pressure transmitter 4 measures the primary air pressure in a primary air main pipe at the outlet of the air preheater in real time, sends the primary air pressure into the second index arithmetic unit 9 for primary air pressure correlation fitting operation, inputs the result of the primary air pressure correlation fitting operation into the second multiplier 10, and inputs the output result of the second multiplier 10 into the adder 13 as the result of the primary air comprehensive fitting operation;
the secondary air volume transmitter 55 measures the secondary air volume at the outlet of the air preheater in real time and sends the secondary air volume to the first function generator 11 for secondary air volume fitting operation; measuring the oxygen content at the SCR inlet in real time through an oxygen content transmitter 66, and sending the oxygen content into a second function generator 12 for oxygen content fitting operation; adding the instantaneous total coal quantity fitting operation result, the primary air comprehensive fitting operation result and the secondary air quantity fitting operation result through an adder 13, sending the addition result into the adder 13, and taking the result output by the adder 13 as an inlet NOXThe initial value of the concentration, then the subtracter 14 will enter NOXSubtracting the initial value of the concentration from the result of the oxygen amount fitting operation, and using the subtracted result as the inlet NOXAnd (4) predicting the concentration.
When SCR inlet NOXWhen a measuring point is in fault, a prediction signal is adopted to replace an original fault signal to participate in the ammonia spraying and denitration control process, so that the workload of operators is effectively reduced, and the control quality is improved.
Claims (3)
1. The system for predicting the NOx concentration at the inlet of the SCR is characterized by comprising a first multiplier (7), a first index arithmetic unit (8), a second index arithmetic unit (9), a first function generator (11), a second function generator (12), a second multiplier (10), an adder (13), a subtracter (14), a weight transmitter (1) for detecting the coal quantity on a belt of a coal mill, a rotating speed transmitter (2) for detecting the rotating speed of the belt of the coal mill, a primary air quantity transmitter (3) for detecting the primary air quantity in a primary air main pipe at the inlet of the coal mill, a primary air pressure transmitter (4) for detecting the primary air pressure in a primary air main pipe at the outlet of an air preheater, a secondary air quantity transmitter (5) for detecting the secondary air quantity at the outlet of the air preheater and an oxygen quantity transmitter (6) for detecting the oxygen quantity at the inlet of the SCR;
the output end of the weight transmitter (1) and the output end of the rotating speed transmitter (2) are connected with the input end of a first multiplier (7), the output end of the primary air volume transmitter (3) is connected with the input end of a first exponential operator (8), and the output end of the primary air pressure transmitter (4) is connected with the input end of a second exponential operator (9); the output end of the secondary air volume transmitter (5) is connected with the input end of a first function generator (11), and the output end of the oxygen volume transmitter (6) is connected with the input end of a second function generator (12);
the output end of the first exponential arithmetic unit (8) and the output end of the second exponential arithmetic unit (9) are connected with the input end of the second multiplier (10), the output end of the first multiplier (7), the output end of the second multiplier (10) and the output end of the first function generator (11) are connected with the input end of an adder (13), and the output end of the adder (13) and the output end of the second function generator (12) are connected with the input end of a subtracter (14).
2. The SCR inlet NOx concentration prediction system of claim 1, further comprising a display coupled to the subtractor (14).
3. The SCR inlet NOx concentration prediction system of claim 1, further comprising a communication module coupled to the subtractor (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022736442.6U CN213423130U (en) | 2020-11-23 | 2020-11-23 | SCR inlet NOx concentration prediction system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022736442.6U CN213423130U (en) | 2020-11-23 | 2020-11-23 | SCR inlet NOx concentration prediction system |
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| Publication Number | Publication Date |
|---|---|
| CN213423130U true CN213423130U (en) | 2021-06-11 |
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| CN202022736442.6U Active CN213423130U (en) | 2020-11-23 | 2020-11-23 | SCR inlet NOx concentration prediction system |
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| CN (1) | CN213423130U (en) |
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2020
- 2020-11-23 CN CN202022736442.6U patent/CN213423130U/en active Active
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