CN113369225A - Online purging system of ammonia injection flowmeter and control method - Google Patents
Online purging system of ammonia injection flowmeter and control method Download PDFInfo
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- CN113369225A CN113369225A CN202110657281.8A CN202110657281A CN113369225A CN 113369225 A CN113369225 A CN 113369225A CN 202110657281 A CN202110657281 A CN 202110657281A CN 113369225 A CN113369225 A CN 113369225A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
- B08B9/0325—Control mechanisms therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/12—Cleaning arrangements; Filters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2203/00—Details of cleaning machines or methods involving the use or presence of liquid or steam
- B08B2203/007—Heating the liquid
Abstract
The invention discloses an online purging system of an ammonia injection flowmeter and a control method, wherein the system comprises a water tank LV, a water pump D1, a pneumatic valve and a PLC; the control method comprises the following steps: 1. the ammonia injection flow X and the opening Y of the regulating valve V3 are tested, and when Y is N1, X1 is F (X), and when Y is N2, X2 is F (X) … …, wherein N is more than 10, and F (X) is an initial function of Y; the measured value F is operated, the blocking rate Z of the flowmeter F is [1-F \ F (X) ] 100%, Z is more than 10% to remind automatic purging, Z is more than 15%, MW is less than U, NOx hour average is less than R, and a DCS full-open regulating valve V3\ quick-closing valve V4 sends an automatic purging instruction to a PLC; 2. the PLC receives DCS instructions to perform purging and feedback, the purging switching valve V2 and the control valve V5 are sequentially closed, the bypass control valve V1, the ammonia blowdown valve V6 and the flushing valve V13 are opened, and the water pump D1 is started; after T1 seconds, stopping the water pump D1, closing the flushing valve V13, opening the purging valve V10, and finishing purging in T2 seconds; the PLC restores the equipment to the state before purging, and feeds back a completion signal to the DCS; 3. after receiving the feedback, the DCS automatically gives N Y values, and if the Z values are less than 5%, the purging is successful, and the operation is recovered.
Description
Technical Field
The invention relates to an online purging system of an ammonia injection flow meter and a control method, which are suitable for an automatic ammonia injection system of a thermal power plant by using a liquid ammonia denitration SCR.
Background
The main pollutant NOX emitted by the boilers of thermal power plants is the main pollutant of the atmosphere. At present, the denitration technology of the flue gas of the coal-fired boiler mainly comprises selective non-catalytic reduction reaction (SNCR), selective catalytic reduction reaction (SCR) and SNCR/SCR combined denitration technology. The denitration usually takes ammonia as a reducing agent, and ammonia gas is diluted by air and then mixed with flue gas to reflect and reduce the ammonia gas into N2 and water vapor to be discharged. In the actual production process, the ammonia pipeline blocks up, control flap, ammonia mass flow meter blocks up and leads to denitration inefficiency, takes place occasionally to the denitration automatic control performance difference, brings the risk for enterprise environmental protection control. Therefore, it is necessary to clean the ammonia gas pipeline, the valve and the flow meter, especially the inside of the ammonia gas regulating valve and the mass flow meter regularly. The invention discloses an online automatic purging system for an ammonia gas pipeline and a flow meter, which is necessary, and meanwhile, the automatic quality of ammonia injection and the capability of coping with environmental risks are improved.
Disclosure of Invention
The invention aims to provide an online purging system and a control method for an ammonia spraying flowmeter, aiming at preventing the problem that the system cannot spray ammonia when a main pipeline and the ammonia spraying flowmeter are blocked.
The invention is realized by adopting the following technical scheme:
an online purging system of an ammonia injection flowmeter comprises a water tank LV, a water pump D1, a pneumatic valve, a PLC, a liquid level switch, a temperature switch, a cable and a communication twisted pair; wherein the content of the first and second substances,
a bypass control valve V1 is installed on an ammonia injection bypass pipeline P1, two ends of P1 are connected to an ammonia injection main pipeline P2, a purging switching valve V2, a flow meter F, an adjusting valve V3, a quick-closing valve V4 and a control valve V5 are sequentially installed on the ammonia injection pipeline P2, an ammonia blow-down valve V6 is installed on a blow-down pipe P3, one end of the blow-down pipe P3 is connected to a P3 pipe between the quick-closing valve V4 and the control valve V5, and the other end of the blow-down pipe P3 is connected to the top of the water tank LV; a water pump D1 and a flushing valve V13 are sequentially arranged on a flushing water pipeline P6, one end of the flushing water pipeline P6 is connected with the bottom of the water tank LV, and the other end of the flushing water pipeline P6 is connected with an ammonia spraying main pipeline P2 behind the purging switching valve V2; one end of a purging pipeline P4 is connected with a site compressed air pipe, and one end of the purging pipeline is connected with a rinsing water pipeline P6 behind a rinsing valve V13, and a purging valve V10 is installed on a purging pipeline P4; one end of the water replenishing pipeline P5 is connected with a water replenishing system, and the other end of the water replenishing pipeline P5 is connected with the upper part of the water tank LV, and the water replenishing valve V11 is arranged on the water replenishing pipeline P5; the heater D2, the temperature switch T and the liquid level switch L are arranged on the water tank LV; a water tank blow-off valve V14 is arranged on a blow-off pipeline P7, one end of the blow-off pipeline P7 is connected to the bottom of the water tank LV, and the other end is empty; the DCS is connected with the PLC through a two-core shielding computer cable; the PLC is respectively connected with a bypass control valve V1, a purge switching valve V2, a control valve V5, an ammonia blowdown valve V6, a purge valve V10, a water replenishing valve V11, a flushing valve V13, a water pump D1, a liquid level switch L, a temperature switch T and a heater D2 through two-core shielding control cables.
The invention is further improved in that the water tank LV is provided with an exhaust hole, and the topmost installation height of the water tank LV is lower than the height of the sewage discharge pipe P3.
The invention further improves that the bypass control valve V1, the purge switching valve V2, the control valve V5, the ammonia blowdown valve V6, the purge valve V10, the water replenishing valve V11 and the flushing valve V13 are pneumatic valves and are 24V direct current explosion-proof type and are controlled by a PLC.
The invention has the further improvement that when the liquid level switch L is lower than a set value, the water replenishing valve V11 is automatically opened, and when the liquid level switch L is higher than the set value, the water replenishing valve V11 is automatically closed.
In a further improvement of the present invention, the heater D2 is automatically turned on when the temperature switch T is lower than a set value, and the heater D2 is automatically turned off when the temperature switch T is higher than the set value.
A further improvement of the present invention is that the tank waste valve V14 is automatically opened periodically.
The invention is further improved in that the DCS and the PLC carry out data interaction control through communication or hard-wired connection.
A control method of an online full-automatic purging system of an ammonia injection flowmeter comprises the following steps:
step 1, obtaining by testing the flow X of an ammonia injection flowmeter and the opening Y of an ammonia injection regulating valve of a unit through a DCS, wherein when Y is N1, X1 is F (X), and when Y is N2, X2 is F (X) … …, N is not less than 10, and F (X) is a curve function of Y; the flow measurement value of the ammonia injection flowmeter is F, the blockage rate Z of the flowmeter F is [1-F \ F (X) ] 100%, when Z is greater than 10%, automatic purging is reminded, when Z is greater than 10%, the unit load MW is smaller than a set value U, meanwhile, the NOx hour of clean flue gas is averagely lower than 20ml/h, and the DCS is fully-opened and adjusted through a valve V3\ a quick-closing valve V4 and outputs an automatic purging instruction to the PLC;
step 2, after the PLC receives the DCS, executing purging control and feeding back a purging starting state to the DCS, sequentially closing the purging switching valve V2 and the control valve V5, simultaneously opening the bypass control valve V1, the ammonia blowdown valve V6 and the flushing valve V13, and starting the water pump D1; after the flushing for T1 seconds, stopping the water pump D1, closing the flushing valve V13 and simultaneously opening the purging valve V10, and purging for T2 seconds to finish purging; after the purging is finished, the PLC restores the equipment to a state before purging, and simultaneously feeds back a purging completion signal to the DCS;
and 3, after receiving a PLC purging completion signal, the DCS automatically gives N Y values, and if the Z values are less than 5%, the purging is considered to be successful, and the system is recovered to operate.
Compared with the prior art, the invention at least has the following beneficial effects:
1. the invention provides an online purging system of an ammonia injection flowmeter and a full-automatic control method, which provide basic guarantee for ammonia injection automation; and the environmental protection risk coping capability is improved.
2. Any fault in the operation of the invention can be displayed by alarm in DCS;
3. in the invention, the operator can interrupt the operation at any time during the operation and automatically return to the operation state before purging;
4. the invention can monitor the blockage rate of the main ammonia injection pipeline and the flowmeter in real time on a DCS human-computer interface;
5. the invention adopts the fitting curve function of the flow characteristic of the ammonia injection regulating valve and the opening degree of the valve to judge the blockage rate of the ammonia injection pipeline and the flow meter;
6. the automatic purging device runs in a full-automatic mode, automatically judges purging time, starts and restores the system to run automatically, and automatically judges purging effect; the water system and sewage disposal used in the invention run fully automatically.
Drawings
FIG. 1 is a block diagram of an online purging system of an ammonia injection flowmeter according to the present invention.
Description of reference numerals:
1 ammonia injection main pipe P210 flowmeter F19 water pump D1
2 ammonia injection by-pass pipeline P111 regulating valve V320 water tank LV
3 blow-off pipe P312 quick-closing valve V421 liquid level switch L
4 purge line P413 control valve V522 temperature switch T
5 water supply pipeline P514 ammonia blowoff valve V623 heater D2
6 flushing water pipeline P615 purge valve V1024 DCS
7 water tank blow-off pipe P716 water replenishing valve V1125 PLC
8 bypass control valve V117 flush valve V13
9 purge switching valve V218 water tank blowdown valve V14
Detailed Description
The invention is further described below with reference to the following figures and examples.
As shown in fig. 1, the online purging system of the ammonia injection flowmeter provided by the invention comprises an ammonia injection pipeline, a purging system and an ammonia injection sequential control system, and specifically comprises a water tank LV, a water pump D1, a pneumatic valve, a PLC, a liquid level switch, a temperature switch, a cable and a communication twisted pair; the bypass control valve V1 is installed on an ammonia spraying bypass pipeline P1, two ends of P1 are connected to an ammonia spraying main pipeline P2, a purging switching valve V2, a flow meter F, an adjusting valve V3, a quick-closing valve V4 and a control valve V5 are sequentially installed on the ammonia spraying main pipeline P2, an ammonia blowdown valve V6 is installed on a blowdown pipe P3, one end of the blowdown pipe P3 is connected to a pipe P3 between the quick-closing valve V4 and the control valve V5, and the other end of the blowdown pipe P3 is connected to the top of the water tank LV; a water pump D1 and a flushing valve V13 are sequentially arranged on a flushing water pipeline P6, one end of the flushing water pipeline P6 is connected with the bottom of the water tank LV, and the other end of the flushing water pipeline P6 is connected with an ammonia spraying main pipeline P2 behind the purging switching valve V2; one end of a purging pipeline P4 is connected with a site compressed air pipe, and one end of the purging pipeline is connected with a rinsing water pipeline P6 behind a rinsing valve V13, and a purging valve V10 is installed on a purging pipeline P4; one end of the water replenishing pipeline P5 is connected with a water replenishing system, and the other end of the water replenishing pipeline P5 is connected with the upper part of the water tank LV, and the water replenishing valve V11 is arranged on the water replenishing pipeline P5; the heater D2, the temperature switch T and the liquid level switch L are arranged on the water tank LV; a water tank blow-off valve V14 is arranged on a blow-off pipeline P7, one end of the blow-off pipeline P7 is connected to the bottom of the water tank LV, and the other end is empty; the DCS is connected with the PLC through a two-core shielding computer cable; the PLC is respectively connected with a bypass control valve V1, a purge switching valve V2, a control valve V5, an ammonia blowdown valve V6, a purge valve V10, a water replenishing valve V11, a flushing valve V13, a water pump D1, a liquid level switch L, a temperature switch T and a heater D2 through two-core shielding control cables.
The water tank LV is provided with an exhaust hole, and the topmost installation height of the water tank LV is lower than the height of the sewage discharge pipe P3.
The bypass control valve V1, the purge switching valve V2, the control valve V5, the ammonia blowdown valve V6, the purge valve V10, the water supplementing valve V11 and the flushing valve V13 are pneumatic valves, are 24V direct current explosion-proof type, and are controlled by a PLC.
When the liquid level switch L is lower than a certain set value, the water supplementing valve V11 is automatically opened, and when the liquid level switch L is higher than a certain set value, the water supplementing valve V11 is automatically closed; when the temperature switch T is lower than a certain set value, the heater D2 is automatically turned on, and when the temperature switch T is higher than a certain set value, the heater D2 is automatically turned off.
The invention provides a control method of an online full-automatic purging system of an ammonia injection flowmeter, and as the DCS control regulating valve V3\ quick-closing valve V4 is a mature technology, the invention is not repeated:
step 1, obtaining a DCS through a test of a flow X of an ammonia injection flowmeter and an opening Y of an ammonia injection regulating valve of a unit by testing when Y is N1, X1 is F (X), Y is N2, X2 is F (X), Y is N3, X3 is F (X) … …, wherein N is not less than 10, and F (X) is a curve function of Y; the flow measurement value of the ammonia injection flowmeter is F, the blockage rate Z of the flowmeter F is [1-F \ F (X) ] 100%, when Z is greater than 10%, the flowmeter F is reminded of purging, when Z is greater than 10%, the change rate of unit load MW and main steam flow G of the boiler is simultaneously smaller than a certain set value U, the NOx hour of clean flue gas is averagely lower than 20ml/h, and the DCS fully-open regulating valve V3\ quick-closing valve V4 outputs an automatic purging instruction to the PLC;
step 2, after the PLC receives the DCS, executing purging control and feeding back a purging starting state to the DCS, sequentially closing the purging switching valve V2 and the control valve V5, simultaneously opening the bypass control valve V1, the ammonia blowdown valve V6 and the flushing valve V13, and starting the water pump D1; after the flushing for T1 seconds, stopping the water pump D1, closing the flushing valve V13 and simultaneously opening the purging valve V10, and purging for T2 seconds to finish purging; after the purging is finished, the PLC restores the equipment to a state before purging, and simultaneously feeds back a purging completion signal to the DCS;
and 3, after receiving a PLC purging completion signal, the DCS automatically gives N Y values, and if the Z values are less than 5%, the purging is considered to be successful, and the system is recovered to operate.
Example (b):
the online purging system of the ammonia spraying flowmeter is particularly applied to the full-automatic online purging of the SCR ammonia spraying of a large unit in a certain country. The specific implementation is as follows:
1. selecting any industrial personal computers such as a Huahua Ipc610 model and the like which are provided with a window2000\ XP \ win7 control system as an upper-level running computer, and a correlative thinvision X22 type display as a display platform, wherein the computer is provided with an XDPS6.0 and a STEP-7MicroWIN V4.0 SP9 which are connected with DCS and PLC by an RJ45 network cable for logic compiling;
2. SMART S40 of Siemens S7-200 is selected as a controller, and a Schneider 24VDC intermediate relay RXM2LB2BD is used for controlling a pneumatic actuator 3V210-08NC solenoid valve through a control cable RVVP 2;
3. a plurality of pneumatic actuators 3V210-08NC are adopted, and the switching between a main ammonia injection pipeline and a bypass 1 is controlled through PLC compiling logic;
4. controlling washing water by using a COR-1MHI206 constant-pressure washing pump and a 3V210-08NC interlocking switch of a pneumatic actuator;
5. controlling water replenishing of a water tank LV by using a pneumatic actuator 3V210-08 NC;
by implementing the scheme, the online automatic purging system of the ammonia injection flowmeter is successfully applied to the site of a certain large power generation company, and the effect of coping with the environmental protection risk is achieved.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. An online purging system of an ammonia injection flowmeter is characterized by comprising a water tank LV, a water pump D1, a pneumatic valve, a PLC, a liquid level switch, a temperature switch, a cable and a communication twisted pair; wherein the content of the first and second substances,
a bypass control valve V1 is installed on an ammonia injection bypass pipeline P1, two ends of P1 are connected to an ammonia injection main pipeline P2, a purging switching valve V2, a flow meter F, an adjusting valve V3, a quick-closing valve V4 and a control valve V5 are sequentially installed on the ammonia injection pipeline P2, an ammonia blow-down valve V6 is installed on a blow-down pipe P3, one end of the blow-down pipe P3 is connected to a P3 pipe between the quick-closing valve V4 and the control valve V5, and the other end of the blow-down pipe P3 is connected to the top of the water tank LV; a water pump D1 and a flushing valve V13 are sequentially arranged on a flushing water pipeline P6, one end of the flushing water pipeline P6 is connected with the bottom of the water tank LV, and the other end of the flushing water pipeline P6 is connected with an ammonia spraying main pipeline P2 behind the purging switching valve V2; one end of a purging pipeline P4 is connected with a site compressed air pipe, and one end of the purging pipeline is connected with a rinsing water pipeline P6 behind a rinsing valve V13, and a purging valve V10 is installed on a purging pipeline P4; one end of the water replenishing pipeline P5 is connected with a water replenishing system, and the other end of the water replenishing pipeline P5 is connected with the upper part of the water tank LV, and the water replenishing valve V11 is arranged on the water replenishing pipeline P5; the heater D2, the temperature switch T and the liquid level switch L are arranged on the water tank LV; a water tank blow-off valve V14 is arranged on a blow-off pipeline P7, one end of the blow-off pipeline P7 is connected to the bottom of the water tank LV, and the other end is empty; the DCS is connected with the PLC through a two-core shielding computer cable; the PLC is respectively connected with a bypass control valve V1, a purge switching valve V2, a control valve V5, an ammonia blowdown valve V6, a purge valve V10, a water replenishing valve V11, a flushing valve V13, a water pump D1, a liquid level switch L, a temperature switch T and a heater D2 through two-core shielding control cables.
2. The online purging system and the full-automatic control method for the ammonia injection flowmeter as claimed in claim 1, wherein the water tank LV is provided with an exhaust hole, and the topmost installation height of the water tank LV is lower than the height of a sewage discharge pipe P3.
3. An on-line purging system and a full-automatic control method for an ammonia spraying flowmeter as claimed in claim 1, wherein the bypass control valve V1, the purging switching valve V2, the control valve V5, the ammonia blowdown valve V6, the purging valve V10, the water supplementing valve V11 and the flushing valve V13 are pneumatic valves and are 24V direct current explosion-proof type and are controlled by a PLC.
4. The online purging system and the full-automatic control method for the ammonia injection flowmeter of claim 1, wherein the water replenishing valve V11 is automatically opened when the liquid level switch L is lower than a set value, and the water replenishing valve V11 is automatically closed when the liquid level switch L is higher than the set value.
5. The online purging system and the full-automatic control method for the ammonia injection flowmeter of claim 1, wherein the heater D2 is automatically turned on when the temperature switch T is lower than a set value, and the heater D2 is automatically turned off when the temperature switch T is higher than the set value.
6. An ammonia injection flowmeter online purging system and a full-automatic control method according to claim 1, characterized in that the water tank blowdown valve V14 is automatically opened periodically.
7. The online purging system and the full-automatic control method for the ammonia injection flowmeter of claim 1, wherein the DCS and the PLC are in data interaction control through communication or hard-wired connection.
8. A control method of an online full-automatic purging system of an ammonia injection flowmeter is characterized by comprising the following steps:
step 1, obtaining by testing the flow X of an ammonia injection flowmeter and the opening Y of an ammonia injection regulating valve of a unit through a DCS, wherein when Y is N1, X1 is F (X), and when Y is N2, X2 is F (X) … …, N is not less than 10, and F (X) is a curve function of Y; the flow measurement value of the ammonia injection flowmeter is F, the blockage rate Z of the flowmeter F is [1-F \ F (X) ] 100%, when Z is greater than 10%, automatic purging is reminded, when Z is greater than 10%, the unit load MW is smaller than a set value U, meanwhile, the NOx hour of clean flue gas is averagely lower than 20ml/h, and the DCS is fully-opened and adjusted through a valve V3\ a quick-closing valve V4 and outputs an automatic purging instruction to the PLC;
step 2, after the PLC receives the DCS, executing purging control and feeding back a purging starting state to the DCS, sequentially closing the purging switching valve V2 and the control valve V5, simultaneously opening the bypass control valve V1, the ammonia blowdown valve V6 and the flushing valve V13, and starting the water pump D1; after the flushing for T1 seconds, stopping the water pump D1, closing the flushing valve V13 and simultaneously opening the purging valve V10, and purging for T2 seconds to finish purging; after the purging is finished, the PLC restores the equipment to a state before purging, and simultaneously feeds back a purging completion signal to the DCS;
and 3, after receiving a PLC purging completion signal, the DCS automatically gives N Y values, and if the Z values are less than 5%, the purging is considered to be successful, and the system is recovered to operate.
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