CN106512723B - Denitration automatic regulating loop device - Google Patents
Denitration automatic regulating loop device Download PDFInfo
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- CN106512723B CN106512723B CN201611218064.4A CN201611218064A CN106512723B CN 106512723 B CN106512723 B CN 106512723B CN 201611218064 A CN201611218064 A CN 201611218064A CN 106512723 B CN106512723 B CN 106512723B
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 102
- 230000033228 biological regulation Effects 0.000 claims abstract description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 44
- 229910021529 ammonia Inorganic materials 0.000 claims description 22
- 230000006870 function Effects 0.000 claims description 17
- 230000003111 delayed effect Effects 0.000 claims description 3
- 230000009711 regulatory function Effects 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 230000005856 abnormality Effects 0.000 abstract description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- 239000003546 flue gas Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000010926 purge Methods 0.000 description 3
- 238000000738 capillary electrophoresis-mass spectrometry Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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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
- B01D53/8696—Controlling the catalytic process
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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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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.
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Abstract
An automatic denitration regulating loop device. When the denitration system is abnormal due to the fact that the analyzer sweeps or other reasons such as equipment system abnormality and the like, the change condition of the measured value can be judged through the hysteresis device and the comparison device, when the measured value is kept unchanged or changed very little, the regulating loop is forbidden to increase, forbidden and reduced, the phenomenon of overshoot of the regulating system is prevented, when the system is recovered to be normal, the automatic regulation can be recovered, the regulating loop does not need to be frequently switched manually and automatically, and the automatic regulation efficiency and quality are ensured. An automatic denitration regulating loop device comprises four parts. The invention is applied to a denitration automatic regulating loop.
Description
Technical field:
the invention relates to a denitration automatic regulating loop device, which is used for judging and forbidden to increase and decrease a loop in a measured value, and the regulating loop does not need to be frequently switched manually and automatically so as to ensure the automatic regulating efficiency and quality.
The background technology is as follows:
the denitration automatic regulating loop is usually realized by DCS and is connected by a functional block diagram method. For the denitration technology of the SCR catalyst reduction method, the automatic denitration adjustment realizes the adjustment of the NOx of the outlet flue gas by controlling an ammonia injection quantity adjusting valve, and the denitration efficiency is controlled within a design value range. With the increasing importance of China on environmental protection, ensuring that the NOx in the clean flue gas reaches the standard is discharged becomes the necessary work.
The denitration automatic regulating loop controls the PID regulator through the difference value after the measured value of the outlet flue gas NOX is compared with the set value, and the output of the regulator controls the opening of the ammonia injection quantity regulating valve through the output of the manual operator, so that the measured value of the outlet flue gas NOX basically accords with the set value.
The original denitration automatic regulating loop has the defect that the denitration automatic regulating loop cannot be put into practice. Disadvantages: the measured value of the NOX of the outlet flue gas is measured through a CEMS analyzer, the analyzer is of an infrared extraction heating type, in the measuring process, the analyzer needs to be purged periodically (otherwise, dust in the flue gas is easy to block a sampling pipeline), and the measured value before purging is kept unchanged by the output value in the purging process, so that the method is a great interference for automatic adjustment of denitration, and an original adjusting loop cannot be put into.
The invention comprises the following steps:
the invention aims to provide a denitration automatic regulating loop device.
The above object is achieved by the following technical scheme:
an automatic denitration regulating loop device comprises four parts: denitration automatic regulating loop device, its constitution includes four parts: automatically switching a manual logic function loop part; a normal regulatory function loop portion; a forbidden increase and forbidden decrease function loop part; overriding the functional loop portion.
The automatic denitration regulating loop device comprises a manual cutting logic loop part, wherein the manual cutting logic loop part comprises: the first comparison device calculates the deviation of the regulating gate feedback signal and the analog quantity switching selection device, takes the calculated result as an output instruction, and the output end of the first comparison device is connected with the input end of the first high-low limit device; the input end of the first high-low limit device is connected with the output end of the first comparison device, receives the output instruction of the first comparison device, compares the output instruction with the high-low limit value, outputs the output device when the output instruction exceeds the limit value, and the output end of the first high-low limit device is connected with the input end of the delay closing device; the input end of the delay closing device receives an output instruction of the first high-low limit device, when the input is 1, the delay is delayed for 1 second, the delay is 1, and the output end of the delay closing device is connected with one input end of the first OR logic device; the first high-limit device is connected with the modulated quantity signal, receives the modulated quantity signal, compares the modulated quantity signal with a high-limit value, outputs a 1 when the modulated quantity signal exceeds the limit value, and the output end of the first high-limit device is connected with the other input end of the OR logic device; and when one of the two input ends is 1, the output end of the logic device I is 1, and the output end of the logic device I is connected with one input end MAN of the manual operator device. The manual operator device is provided with a plurality of input ends, wherein one input end MAN end is connected with the output end of the OR logic device I, and receives the output instruction of the OR logic device I, when the input end is 1 (which indicates that the deviation between the regulating gate instruction and the feedback is large or the regulated quantity signal exceeds the automatic regulating range), the manual operator device is switched to a manual mode, at the moment, the manual operator device receives the manual operation instruction of an operator and outputs the manual operation instruction as the instruction of the output end of the manual operator device, the PID regulator tracks the output instruction of the manual operator device, and the output end of the manual operator device is connected with the input end of the analog quantity switching selection device; one of the input ends N of the analog switching selection device is connected with the output end of the manual operation device, receives an output instruction of the manual operation device under normal conditions, and outputs an instruction signal for adjusting the gate.
The denitration automatic regulating loop device, the normal regulating function part includes: the set value device receives a manual set value signal of an operator, and the output end of the set value device is connected with one of the input ends S of the PID regulator; the first hysteresis device is connected with the modulated quantity signal, receives the modulated quantity signal, carries out hysteresis processing on the signal, and the output end of the first hysteresis device is connected with the other input end P end of the PID regulator; the two input ends S and P of the PID regulator are respectively connected with the set value device and the first hysteresis device, and receive the output end instructions of the set value device and the first hysteresis device, and output control instructions after corresponding PID operation according to the deviation of the set value device and the first hysteresis device, and the output end of the PID regulator is connected with the manual operator device; the manual operation device is provided with a plurality of input ends, the input ends of the adjusting signals of the manual operation device are connected with the output ends of the PID regulator, and in an automatic mode, the manual operation device receives the output instruction of the regulator and outputs the output instruction as the instruction of the output end of the manual operation device, and the output end of the manual operation device is connected with the input end of the analog quantity switching selection device; and one input end N of the analog quantity switching and selecting device is connected with the output end of the manual operator device, receives an output instruction of the manual operator under normal conditions, and outputs an instruction signal for adjusting the gate.
The denitration automatic regulating loop device, the normal regulating function loop part includes: the second hysteresis device is connected with the modulated quantity signal, receives the modulated quantity signal, carries out 5 seconds hysteresis processing on the signal, and the output end of the second hysteresis device is connected with one of the input ends of the second comparison device; the second input end of the comparison device is respectively connected with the output ends of the regulated quantity signal and the second hysteresis device, and receives the output instructions of the regulated quantity signal and the second hysteresis device, the comparison device calculates the deviation of the regulated quantity signal and the second hysteresis device, the calculated result can reflect the variation of the regulated quantity before and after 5 seconds, and the output end of the comparison device is connected with the input end of the second high-low limit device; the input end of the second high-low limit device is connected with the output end of the second comparison device, receives the output instruction of the second comparison device, compares the output instruction with the high-low limit value +/-0.08, outputs 1 if the output instruction exceeds the limit value, otherwise, outputs 0, and the output end of the second high-low limit device is connected with the input end of the delay breaking device; the input end of the delay disconnecting device is connected with the output end of the second high-low limit device, when the input is 0, the delay is 5 seconds, the output is 0, and the output end of the delay disconnecting device is connected with the input end of the logic negation algorithm device; the input end of the logic non-taking algorithm device is connected with the output end of the delay breaking device, when the input is 0 (representing that the change of the regulated quantity is not more than +/-0.08 and lasts for 5 seconds), the output is set to 1, and the output end of the logic non-taking algorithm device is connected with one of the input ends of the logic device II; the two input ends of the AND logic device II are respectively connected with one output end A end (the value of which is 1 and represents that the manual operator is in an automatic mode) of the manual operator device and the output end of the logic non-arithmetic device, when the two input ends are 1, the change of the regulated quantity is not more than +/-0.08 and lasts for 5 seconds in the automatic mode, at the moment, the device outputs a switching quantity instruction set 1, the output end of the AND logic device II is divided into two paths, one path of the output ends is connected with one input end LWI end (forbidden to reduce) of the manual operator device, and the other path of the output ends of the AND logic device II is connected with one input end of the manual operator device; the input end of the first low-limit device is connected with the modulated quantity signal, receives the modulated quantity signal, compares the modulated quantity signal with the low limit value, outputs a 1 when the modulated quantity signal is smaller than the low limit value, and the output end of the first low-limit device is connected with one input end of the first logic device; the input end of the second high-limit device is connected with the ammonia escape rate signal, receives the ammonia escape rate signal, compares the ammonia escape rate signal with a high-limit value, outputs a device 1 when the ammonia escape rate signal exceeds the high-limit value, and the output end of the second high-limit device is connected with the other input end of the first logic device; the two input ends of the AND logic device I are respectively connected with the output ends of the low-limit device I and the high-limit device II, when the two input ends are 1, the AND logic device I outputs 1, and the output end of the AND logic device I is connected with the other input end of the OR logic device II; or logic device II, two input ends of the described or logic device II are respectively connected with output ends of logic device II and logic device I, when one of two input ends is 1, it is indicated that under the automatic mode, the regulated quantity change is not exceeded + -0.08 and can be continued for 5 seconds, or ammonia escape rate is exceeded, at this time the device output switch quantity instruction device 1, its output end is connected with one of input ends RAI end (forbidden increase) of manual operator device. The manual operator device is provided with a plurality of input ends, wherein one of the input ends LWI is connected with the output end of the logic device II, the other input end RAI is connected with the output end of the logic device II, and when the LWI is 1 (the change of a signal of the regulated quantity is very small or basically unchanged), the manual operator is switched to a forbidden and reduced mode, and the output instruction of the manual operator can only be increased and can not be reduced; when the RAI end is 1 (the change of the regulated quantity signal is small or the safety escape rate exceeds the alarm limit value), the manual operator is switched to a forbidden increase mode, the output instruction of the manual operator can only be reduced and can not be increased, if the LWI end and the RAI end are simultaneously 1, the output of the manual operator is kept at the current value, and the output end of the manual operator device is connected with the input end of the analog quantity switching selection device; one of the input ends N of the analog switching selection device is connected with the output end of the manual operation device, receives an output instruction of the manual operation device under normal conditions, and outputs an instruction signal for adjusting the gate.
The denitration automatic regulating circuit device according to claim 1 or 2 or 3 or 4, characterized in that:
the override function loop portion includes: the analog quantity switching selection device is provided with a plurality of input ends, one input end is connected with the tripping signal of the SCR reactor, the other input end is connected with the analog quantity generator, when the selected input end is 1 (representing the tripping of the SCR reactor), the analog quantity switching selection device receives the analog quantity value input of the Y end and outputs an adjusting gate command signal, the value parameter in the analog quantity generator can be changed, the initial parameter value is 0, when the reactor trips, the adjusting gate is closed, and otherwise, the manual operator command is received.
The invention has the beneficial effects that:
the regulating loop mainly solves the problem that the measured value is kept or the change is small in a period of time to interfere the automatic regulation due to purging of the CEMS analyzer or other abnormality such as equipment system reasons in the automatic regulation process, so that the regulating loop can be smoothly put into operation without frequent manual and automatic switching.
When the system is purged by the analyzer or the change of the measured value is small in a period of time due to other reasons such as abnormal equipment system and the like, the control loop can judge the change condition of the measured value through the hysteresis device and the comparison device, when the measured value is kept unchanged or the change is small, the regulating loop is forbidden to increase, forbidden and reduced, the phenomenon of overshoot of the regulating system is prevented, when the system is recovered to be normal, the system can resume to automatically regulate, the regulating loop does not need frequent manual automatic switching, the automatic regulating efficiency and quality are ensured, and the regulating loop does not influence normal manual operation.
Description of the drawings:
fig. 1 is a schematic diagram of the structure of the present invention.
The specific embodiment is as follows:
example 1:
an automatic denitration regulating loop device comprises four parts: automatically switching a manual logic function loop part; a normal regulatory function loop portion; a forbidden increase and forbidden decrease function loop part; overriding the functional loop portion.
Example 2:
the denitration automatic regulating circuit device according to embodiment 1, characterized in that: the manual cutting logic circuit part comprises: the first comparison device 1, two input ends of the first comparison device 1 are respectively connected with the regulating gate feedback signal 23 and the output end of the analog quantity switching selection device 3, and receive the output instructions of the regulating gate feedback signal 23 and the analog quantity switching selection device 3, the first comparison device 1 calculates the deviation of the regulating gate feedback signal 23 and the analog quantity switching selection device, the calculated result is used as the output instruction, and the output end of the first comparison device is connected with the input end of the first high-low limit device 2; the input end of the high-low limit device I2 is connected with the output end of the comparison device I1, receives the output instruction of the comparison device I1, compares the output instruction with the high-low limit value, outputs the device 1 when the output instruction exceeds the limit value, and the output end of the device I is connected with the input end of the delay closing device 4; the input end of the delay closing device 4 receives an output instruction of the first high-low limit device 2, when the input is 1, the delay is delayed for 1 second, the delay is 1, and the output end of the delay closing device 4 is connected with one input end of the OR logic device 5; the first high-limit device 6 is connected with the modulated quantity signal 24, receives the modulated quantity signal, compares the modulated quantity signal with a high-limit value, outputs a 1 if the modulated quantity signal exceeds the high-limit value, and is connected with the other input end of the OR logic device 5; and the two input ends of the OR logic device I5 are respectively connected with the delay closing device 4 and the high-limit device I6, and receive output instructions of the delay closing device 4 and the high-limit device I, when one of the two input ends is 1, the output end of the OR logic device I5 is 1, and the output end of the OR logic device I is connected with one input end MAN of the manual operator device 14. The manual operator device 14 has a plurality of input ends, wherein one of the input ends MAN end is connected with the output end of the or logic device one 5, receives the output instruction of the or logic device one 5, when the input end is 1 (which indicates that the deviation between the regulating gate instruction and the feedback is large or the regulated quantity signal exceeds the automatic regulating range), the manual operator is switched to a manual mode, at the moment, the manual operator receives the manual operation instruction of an operator and outputs the manual operation instruction as the instruction of the output end of the manual operator, the PID regulator 13 tracks the output instruction of the manual operator, and the output end of the manual operator device 14 is connected with the input end of the analog quantity switching selection device 3; one of the input terminals N of the analog quantity switching selection means 3 is connected to the output terminal of the manual operation device 14, and normally receives an manual operation output command and outputs a regulating gate command signal 26.
Example 3:
the denitration automatic regulating circuit device according to embodiment 1 or 2, wherein the normal regulating function portion includes: the setting value device 19 receives a manual setting value signal of an operator, and the output end of the setting value device 19 is connected with one input end S end of the PID regulator 13; the first hysteresis device 7 is connected with the modulated quantity signal 24, receives the modulated quantity signal, carries out hysteresis processing on the signal, and the output end of the first hysteresis device 7 is connected with the other input end P end of the PID regulator 13; the PID regulator 13, two input ends S and P of the PID regulator 13 are respectively connected with the set value device 19 and the hysteresis device I7, and receive the output end instructions of the set value device 19 and the hysteresis device I7, and output control instructions after corresponding PID operation according to the deviation of the set value device 19 and the hysteresis device I7, and the output ends of the PID regulator 13 are connected with the manual operator device 14; the manual operation device 14, the manual operation device 14 has a plurality of input ends, the input end of the adjusting signal of the manual operation device 14 is connected with the output end of the PID regulator 13, in the automatic mode, the manual operation device receives the output instruction of the regulator and outputs the output instruction as the instruction of the output end of the manual operation device, and the output end of the manual operation device 14 is connected with the input end of the analog quantity switching selection device 3; and the analog quantity switching selection device 3, wherein one input end N of the analog quantity switching selection device 3 is connected with the output end of the manual operation device 14, receives an output instruction of the manual operation device under normal conditions, and outputs an adjusting gate instruction signal 26.
Example 4:
the denitration automatic regulating circuit device according to embodiment 1 or 2 or 3, wherein the normal regulating function circuit portion includes: the second hysteresis device 9 is connected with the modulated quantity signal 24, receives the modulated quantity signal, carries out hysteresis processing on the signal for 5 seconds, and the output end of the second hysteresis device 9 is connected with one of the input ends of the second comparison device 10; the second comparing device 10, two input ends of the second comparing device 10 are respectively connected with the output ends of the regulated quantity signal 24 and the second hysteresis device 9, and receive the output instructions of the regulated quantity signal 24 and the second hysteresis device 9, the second comparing device 10 calculates the deviation of the regulated quantity signal 24 and the second hysteresis device 9, the calculated result can reflect the variation of the regulated quantity before and after 5 seconds, and the output end of the second comparing device can be connected with the input end of the second high-low limit device 11; the input end of the second high-low limit device 11 is connected with the output end of the second comparison device 10, receives the output instruction of the second comparison device 10, compares the output instruction with the high-low limit value +/-0.08, outputs 1 if the output instruction exceeds the limit value, otherwise, outputs 0, and the output end of the second high-low limit device is connected with the input end of the delay breaking device 12; the input end of the delay disconnecting device 12 is connected with the output end of the second high-low limit device 11, when the input is 0, the delay is 5 seconds, the output is 0, and the output end of the delay disconnecting device 12 is connected with the input end of the logic negation algorithm device 17; the input end of the logic negation algorithm device 17 is connected with the output end of the delay disconnection device 12, when the input is 0 (representing that the variation of the regulated quantity is not more than +/-0.08 and lasts for 5 seconds), the output is set to 1, and the output end of the logic negation algorithm device 17 is connected with one input end of the logic device II 16; the second AND logic device 16, wherein two input ends of the second AND logic device 16 are respectively connected with one output end A end (a value of 1 represents that the manual is in an automatic mode) of the manual device 14 and the output end of the logic non-arithmetic device 17, when the two input ends are 1, the change of the regulated quantity is not more than +/-0.08 and lasts for 5 seconds in the automatic mode, at the moment, the device outputs a switching quantity command device 1, the output end of the device is divided into two paths, one path is connected with one input end LWI end (forbidden and subtracted) of the manual device 14, and the other path is connected with one input end of the second OR logic device 15; the input end of the first low-limit device 8 is connected with the modulated quantity signal 24, receives the modulated quantity signal, compares with a low limit value, outputs a 1 when the modulated quantity signal is smaller than the low limit value, and the output end of the first low-limit device 8 is connected with one input end of the first logic device 18; the input end of the second high-limit device 22 is connected with an ammonia escape rate signal 25, receives the ammonia escape rate signal, compares the ammonia escape rate signal with a high limit value, outputs a device 1 when the ammonia escape rate signal exceeds the high limit value, and the output end of the second high-limit device 22 is connected with the other input end of the first logic device 18; the AND logic device I18, wherein two input ends of the AND logic device I18 are respectively connected with the output ends of the low-limit device I8 and the high-limit device II 22, when the two input ends are 1, the AND logic device I outputs 1, and the output end of the AND logic device I is connected with the other input end of the OR logic device II 15; the second or logic device 15, two input ends of the second or logic device 15 are respectively connected with the output ends of the second or logic device 16 and the first or logic device 18, when one of the two input ends is 1, the change of the regulated quantity is not more than +/-0.08 and lasts for 5 seconds in the automatic mode, or the ammonia escape rate exceeds the limit, at the moment, the device outputs a switching quantity command set 1, and the output end of the switching quantity command set is connected with one input end RAI (forbidden increase) of the manual operator device 14. The manual operator device 14 has a plurality of input ends, wherein one of the input ends LWI end is connected with the output end of the logic device II 16, the other input end RAI end is connected with the output end of the logic device II 15, when the LWI end is 1 (the change of the signal representing the regulated quantity is very small or basically unchanged), the manual operator is switched to the forbidden and reduced mode, and the output instruction of the manual operator can only be increased and can not be reduced; when the RAI end is 1 (the change of the regulated quantity signal is small or the safety escape rate exceeds the alarm limit value), the manual operator is switched to a forbidden increase mode, the output instruction of the manual operator can only be reduced and can not be increased, if the LWI end and the RAI end are simultaneously 1, the output of the manual operator is kept at the current value, and the output end of the manual operator device 14 is connected with the input end of the analog quantity switching selection device 3; one of the input terminals N of the analog quantity switching selection means 3 is connected to the output terminal of the manual operation device 14, and normally receives an manual operation output command and outputs a regulating gate command signal 26.
Example 5:
the denitration automatic regulating circuit device according to embodiment 1 or 2 or 3 or 4, wherein the override function circuit portion includes: the analog quantity switching selecting device 3, wherein the analog quantity switching selecting device 3 has a plurality of input ends, one of the input end selecting input ends is connected with the SCR reactor trip signal 20, the other input end Y is connected with the analog quantity generator 21, when the selecting input end is 1 (indicating the SCR reactor trip), the analog quantity switching selecting device 3 receives the analog quantity value input of the Y end and outputs the regulating gate command signal 26. The numerical parameters in the analog quantity generator may be changed with an initial parameter value of 0. In this loop, the regulator door closes when the reactor trips, otherwise manual commands are received.
Example 6:
according to the automatic denitration regulating circuit device of embodiment 1 or 2 or 3 or 4 or 5, three in-situ analog input signals are received in the whole circuit, namely a regulating gate feedback signal 23, a regulated quantity signal 24 and an ammonia escape rate signal 25, and one in-situ switching value input signal is: the SCR reactor trip signal 20, while the loop is also capable of receiving manual operator instructions and automatic mode set point setting signals, the loop outputs a throttle command signal 26 to the on-site facility. The first comparator 1 receives the regulating gate feedback signal 23, the first high-limit device 6, the first hysteresis device 7, the first low-limit device 8, the second comparator 10 and the second hysteresis device 9 respectively receive the regulated quantity signal 24, the second high-limit module 22 receives the ammonia escape rate signal 25, and the analog quantity switching selection device 3 sends a regulating gate command signal.
Example 7:
the comparison device I is provided with two input ends for receiving analog input signals, and calculates the deviation of the two input ends, and the calculated result is used as an analog output instruction;
high low limit device one 2: the device can receive analog input signals, compare the analog input signals with high and low limit values, and output a switching value instruction set 1 when the deviation between the input and the limit values exceeds 5.
Analog quantity switching selection device 3: the device comprises three input ends, an N end, a Y end and a selection input end FLAG end, wherein the N end and the Y end receive analog input signals, the FLAG end receives switching value input signals, the device outputs analog signal instructions, when the FLAG end is 1, the switching selection device selects the Y end as an output instruction, and otherwise, the N end is selected as the output instruction.
Time delay closing device 4: the device can receive the switching value input signal, delay for 1 second when the input is 1, and output the switching value instruction to be 1.
Or logic device one 5: the device is provided with two input ends for receiving the switching value input signals, the device calculates the deviation of the two input ends, the calculated result is used as an analog output instruction, and when one of the two input ends is 1, the switching value instruction is output to be 1.
High limit device one 6: the device can receive analog input signals, compare the analog input signals with a high limit value, and output a switching value command device 1 when the input exceeds the high limit value.
Hysteresis device one 7: the device receives the analog input signal and performs hysteresis processing on the signal, wherein the hysteresis time is 2 seconds.
Low limit device one 8: the device can receive analog input signals and compare the analog input signals with a low limit value, and when the input is smaller than the low limit value, the device outputs a switching value instruction set 1.
Hysteresis device two 9: the device receives the analog input signal and performs hysteresis processing on the signal, wherein the hysteresis time is 5 seconds.
Comparison device two 10: the device is provided with two input ends for receiving analog input signals, calculates the deviation of the two input ends, and takes the calculated result as an analog output instruction. The device 10 is used together with the device 9, and can compare the change of the regulated quantity before and after 5 seconds.
High and low limit device two 11: the device can receive analog input signals, compare the analog input signals with a high limit value plus or minus 0.08, output a 1 if the analog input signals exceed the high limit value plus or minus 0, otherwise, the analog input signals are 0.
Delay cutoff device 12: the device receives a switching value input signal and outputs a switching value instruction. When the input is 0, the delay is 5 seconds, and the output is set to 0. The device 9, the device 10 and the device 11 are matched with the device 12, so that the change of the regulated quantity before and after 5 seconds can be compared, and the regulated quantity does not change by +/-0.08.
Regulator 13: the device is provided with two analog quantity input ends, namely a set value input end S end and a regulated quantity input end P end, and outputs an analog quantity control instruction after corresponding PID operation according to the deviation of the set value input end S end and the regulated quantity input end P end.
Manual operator device 14: the device has a plurality of inputs, three of which are switching signal inputs: MAN end, LWI end, RAI end, an analog signal input end: and adjusting the signal input. In the automatic mode, the manual operator receives an output instruction of the regulator from the input end of the analog quantity signal and outputs the output instruction as an instruction of the output end of the manual operator; when the MAN end is 1 (in the loop, the deviation between the regulating gate command and the feedback is large or the regulated quantity signal exceeds the automatic regulating range), the manual operator is switched to a manual mode, at the moment, the manual operator receives the manual operation command of an operator and outputs the manual operation command as a command of the output end of the manual operator, and the PID regulator 13 tracks the manual operator output command; when the LWI terminal is 1 (the change of the modulated quantity signal is very small or basically unchanged in the loop), the manual operator is switched to a forbidden and reduced mode, and the output instruction of the manual operator can only be increased and cannot be reduced; when the RAI end is 1 (the change of the regulated quantity signal is small or the escape rate exceeds the alarm limit value in the loop), the manual operator is switched to a forbidden increase mode, and the output instruction of the manual operator can only be reduced and cannot be increased; if both the LWI terminal and the RAI terminal are at 1, the operator output remains at the current value.
Or logic device two 15: the device has two switching value inputs, and when one of the two inputs is 1, the output device 1. In this loop, in the automatic mode, the regulated quantity is changed by not more than + -0.08 and lasts for 5 seconds, or when the ammonia escape rate exceeds the limit, output is set to 1.
And logic device two 16: the device has two switching value input ends, and when two input ends are 1, the output switching value instruction is set to 1. In this loop, in the automatic mode, the amount of the adjustment is changed by not more than + -0.08 and lasts for 5 seconds, and then output is set to 1.
Logical negation algorithm means 17: the device has a switching value input terminal, and outputs a switching value command set 1 when the input is 0. In this loop, when the amount of modulation does not change by more than + -0.08 and lasts for 5 seconds, output is set to 1.
And logic device one 18: the device has two switching value input ends, and when two input ends are 1, the output switching value instruction is set to 1. In this loop, when the regulated amount is normal and the ammonia escape rate exceeds the limit, output is set to 1.
Setting value device 19: the device can receive the analog quantity set value setting signal of the operator and output an analog quantity instruction to the regulator.
Analog quantity generator 21: the device has initial analog parameter setting, the parameter value can be changed, and the device outputs analog value signal.
High limit device two 22: the device has a switching value input terminal, and outputs a switching value command 1 when the input exceeds a high limit value.
Claims (1)
1. The utility model provides a denitration automatic regulating circuit device which characterized in that includes four parts: automatically switching a manual logic function loop part, a normal regulation function loop part, a forbidden add forbidden subtract function loop part and an override function loop part;
the automatic manual cutting logic function loop part comprises: the first comparison device calculates the deviation of the regulating gate feedback signal and the analog quantity switching selection device, takes the calculated result as an output instruction, and the output end of the first comparison device is connected with the input end of the first high-low limit device; the input end of the first high-low limit device is connected with the output end of the first comparison device, receives the output instruction of the first comparison device, compares the output instruction with the high-low limit value, outputs the output device when the output instruction exceeds the limit value, and the output end of the first high-low limit device is connected with the input end of the delay closing device; the input end of the delay closing device receives an output instruction of the first high-low limit device, when the input is 1, the delay is delayed for 1 second, the delay is 1, and the output end of the delay closing device is connected with one input end of the first OR logic device; the first high-limit device is connected with the modulated quantity signal, receives the modulated quantity signal, compares the modulated quantity signal with a high-limit value, outputs a 1 when the modulated quantity signal exceeds the limit value, and the output end of the first high-limit device is connected with the other input end of the OR logic device; the first logic device is connected with the delay closing device and the first high-limit device respectively at two input ends, and receives output instructions of the delay closing device and the first high-limit device, when one of the two input ends is 1, the first logic device is arranged with the output 1, and the output end of the first logic device is connected with one of the input ends MAN of the manual operator device; the manual operator device is provided with a plurality of input ends, wherein one input end MAN end is connected with the output end of the OR logic device I, and receives the output instruction of the OR logic device I, when the input end is 1, the deviation between the regulating gate instruction and feedback is large or the regulated quantity signal exceeds the automatic regulating range, the manual operator is switched to a manual mode, at the moment, the manual operator receives the manual operation instruction of an operator and outputs the manual operation instruction as the instruction of the output end of the manual operator, the PID regulator tracks the output instruction of the manual operator, and the output end of the manual operator device is connected with the input end of the analog quantity switching selection device; one of the input ends N of the analog switching selection device is connected with the output end of the manual operator device, receives an output instruction of the manual operator under normal conditions, and outputs an instruction signal for adjusting the gate;
the normal regulatory function loop part includes: the set value device receives a manual set value signal of an operator, and the output end of the set value device is connected with one of the input ends S of the PID regulator; the first hysteresis device is connected with the modulated quantity signal, receives the modulated quantity signal, carries out hysteresis processing on the signal, and the output end of the first hysteresis device is connected with the other input end P end of the PID regulator; the two input ends S and P of the PID regulator are respectively connected with the set value device and the first hysteresis device, and receive the output end instructions of the set value device and the first hysteresis device, and output control instructions after corresponding PID operation according to the deviation of the set value device and the first hysteresis device, and the output end of the PID regulator is connected with the manual operator device; the manual operation device is provided with a plurality of input ends, the input ends of the adjusting signals of the manual operation device are connected with the output ends of the PID regulator, and in an automatic mode, the manual operation device receives the output instruction of the regulator and outputs the output instruction as the instruction of the output end of the manual operation device, and the output end of the manual operation device is connected with the input end of the analog quantity switching selection device; the analog quantity switching selection device is characterized in that one input end N of the analog quantity switching selection device is connected with the output end of the manual operator device, receives an output instruction of the manual operator under normal conditions, and outputs an instruction signal for adjusting a door;
the forbidden increase and decrease function loop part comprises: the second hysteresis device is connected with the modulated quantity signal, receives the modulated quantity signal, carries out 5 seconds hysteresis processing on the signal, and the output end of the second hysteresis device is connected with one of the input ends of the second comparison device; the second input end of the comparison device is respectively connected with the output ends of the regulated quantity signal and the second hysteresis device, and receives the output instructions of the regulated quantity signal and the second hysteresis device, the comparison device calculates the deviation of the regulated quantity signal and the second hysteresis device, the calculated result can reflect the variation of the regulated quantity before and after 5 seconds, and the output end of the comparison device is connected with the input end of the second high-low limit device; the input end of the second high-low limit device is connected with the output end of the second comparison device, receives the output instruction of the second comparison device, compares the output instruction with the high-low limit value +/-0.08, outputs 1 if the output instruction exceeds the limit value, otherwise, outputs 0, and the output end of the second high-low limit device is connected with the input end of the delay breaking device; the input end of the delay disconnecting device is connected with the output end of the second high-low limit device, when the input is 0, the delay is 5 seconds, the output is 0, and the output end of the delay disconnecting device is connected with the input end of the logic negation algorithm device; the input end of the logic non-taking algorithm device is connected with the output end of the delay breaking device, when the input is 0 time, the change of the representation modulated quantity is not more than +/-0.08 and lasts for 5 seconds, the output device is 1, and the output end of the logic non-taking algorithm device is connected with one input end of the logic device II; the two input ends of the AND logic device II are respectively connected with one output end A end of the manual operator device and the output end of the logic non-arithmetic device, wherein the value of one output end A end is 1, which represents that the manual operator is in an automatic mode, when the two input ends are 1, the change of the regulated quantity is not more than +/-0.08 and lasts for 5 seconds in the automatic mode, at the moment, the device outputs a switching quantity instruction set 1, the output end of the AND logic device II is divided into two paths, one path is connected with one input end LWI end of the manual operator device, and the other path is connected with one input end of the OR logic device II; the input end of the first low-limit device is connected with the modulated quantity signal, receives the modulated quantity signal, compares the modulated quantity signal with the low limit value, outputs a 1 when the modulated quantity signal is smaller than the low limit value, and the output end of the first low-limit device is connected with one input end of the first logic device; the input end of the second high-limit device is connected with the ammonia escape rate signal, receives the ammonia escape rate signal, compares the ammonia escape rate signal with a high-limit value, outputs a device 1 when the ammonia escape rate signal exceeds the high-limit value, and the output end of the second high-limit device is connected with the other input end of the first logic device; the two input ends of the AND logic device I are respectively connected with the output ends of the low-limit device I and the high-limit device II, when the two input ends are 1, the AND logic device I outputs 1, and the output end of the AND logic device I is connected with the other input end of the OR logic device II; the second or logic device is connected with the second or logic device and the first logic device respectively, when one of the two input ends is 1, the change of the regulated quantity is not more than +/-0.08 and lasts for 5 seconds in an automatic mode, or the ammonia escape rate exceeds the limit, at the moment, the device outputs a switching quantity instruction set 1, and the output end of the device is connected with one input end RAI end of the manual operator device; the manual operator device is provided with a plurality of input ends, wherein one of the input ends LWI is connected with the output end of the logic device II, the other input end RAI is connected with the output end of the logic device II, when the LWI is 1, the change of the signal representing the regulated quantity is small, the manual operator is switched to a forbidden and reduced mode, and the output instruction of the manual operator can only be increased and can not be reduced; when the RAI end is 1, the change of the regulated quantity signal is small or the ammonia escape rate exceeds the alarm limit value, the manual operation device is switched to a forbidden increase mode, the output instruction of the manual operation device can only be reduced and can not be increased, if the LWI end and the RAI end are 1 at the same time, the output of the manual operation device is kept at the current value, and the output end of the manual operation device is connected with the input end of the analog quantity switching selection device; one of the input ends N of the analog switching selection device is connected with the output end of the manual operator device, receives an output instruction of the manual operator under normal conditions, and outputs an instruction signal for adjusting the gate;
the override function loop portion includes: the analog quantity switching selection device is provided with a plurality of input ends, one input end is connected with the tripping signal of the SCR reactor, the other input end is connected with the analog quantity generator, when the selected input end is 1 and indicates the tripping of the SCR reactor, the analog quantity switching selection device receives the analog quantity value input of the Y end and outputs a regulating gate command signal, the value parameter in the analog quantity generator is changed, the initial parameter value is 0, when the reactor trips, the regulating gate is closed, and otherwise, the manual operator command is received.
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| CN106731829A (en) * | 2017-03-31 | 2017-05-31 | 华北电力大学（保定） | Suppress control system and method for the purging on thermal power plant's discharged nitrous oxides influence |
| CN106873381B (en) * | 2017-04-10 | 2019-12-10 | 内蒙古瑞特优化科技股份有限公司 | ammonia spraying control system |
| CN107803114B (en) * | 2017-12-04 | 2020-06-16 | 烟台龙源电力技术股份有限公司 | Denitration control system and control method and control device thereof |
| CN108159881B (en) * | 2018-01-10 | 2020-03-06 | 中国大唐集团科学技术研究院有限公司华东分公司 | SCR denitration follow-up control system and method based on optimized operation |
| CN111495129B (en) * | 2020-04-24 | 2021-04-13 | 大唐环境产业集团股份有限公司 | Override control method for solving sudden rising of NOx concentration in denitration ammonia injection system |
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