CN209906468U - Automatic oxygenation of power plant feedwater and coordinated accurate control device that adds ammonia - Google Patents
Automatic oxygenation of power plant feedwater and coordinated accurate control device that adds ammonia Download PDFInfo
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- CN209906468U CN209906468U CN201920526751.5U CN201920526751U CN209906468U CN 209906468 U CN209906468 U CN 209906468U CN 201920526751 U CN201920526751 U CN 201920526751U CN 209906468 U CN209906468 U CN 209906468U
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Abstract
A power plant feed water automatic oxygenation and ammonia adding cooperative accurate control device, the device includes automatic oxygenation and ammonia adding cooperative control device, feed water oxygenation system and condensed water ammonia adding system, mainly include PLC automatic oxygenation and ammonia adding cooperative controller, add oxygen relief valve, add oxygen electromagnetic control valve, add oxygen stabiliser and add parts such as ammonia metering pump; introducing a feed water hydrogen conductivity signal into a PLC automatic oxygenation and ammoniation cooperative controller, controlling proper oxygen addition amount and ammonia addition amount when the feed water hydrogen conductivity is less than 0.15 mu S/cm, closing an oxygenation electric shutoff valve when the feed water hydrogen conductivity is more than 0.15 mu S/cm, stopping oxygenation and properly increasing the ammonia addition amount; and the unit load is used as feedforward, the feedforward PID regulation is carried out on the added ammonia according to the comparison result of the measured value of the dissolved oxygen content of the feed water and the set value of the dissolved oxygen content, the accurate control of the added oxygen is realized, and the unit load is used as feedforward, and the feedforward PID regulation is carried out on the added ammonia according to the comparison result of the measured value of the conductivity of the inlet of the deaerator and the set value of the conductivity, so that the accurate control of the added ammonia is realized.
Description
Technical Field
The utility model relates to a power plant steam system chemistry adds oxygen and adds ammonia technical field, in particular to automatic water feeding adds oxygen and adds ammonia's accurate control device in coordination and method.
Background
In order to inhibit corrosion of a water vapor system of a supercritical unit of a power plant and ensure safe and stable operation of the unit, the supercritical unit is usually subjected to synergistic treatment of oxygen addition and ammonia addition, wherein the oxygen addition treatment has obvious advantages in the aspects of preventing generation and deposition of corrosion products, prolonging the hydrogen type operation period of a fine treatment mixed bed and the like.
Oxygen in the thermodynamic system water has a dual role, being both a cathode depolarizer and an anode passivator. When oxygen acts as a cathodic depolarizer, the oxygen content increases and the corrosion rate of iron increases. When oxygen acts as a passivating agent, the existence of oxygen reduces the corrosion speed, and after the purity of water reaches a certain requirement (the hydrogen conductivity is less than 0.15 mu S/cm), oxygen with a certain concentration can form a uniform and compact ferric oxide + magnetic ferroferric oxide double-layer structure protective film on the surface of carbon steel, thereby inhibiting the flow accelerated corrosion of water supply, hydrophobic system carbon steel and low alloy steel equipment. Therefore, when the hydrogen conductivity of the water is less than 0.15 muS/cm, the water is treated by the synergistic treatment of adding oxygen and ammonia, and when the hydrogen conductivity of the water is greater than 0.15 muS/cm and the water tends to increase continuously, the oxygen addition is considered to be stopped, and the water is treated by the oxidative total volatilization treatment of only adding ammonia. However, when oxygen is added, ammonia is added, and the amount of the added oxygen and the added ammonia is controlled by manual regulation, so that the optimal control effect of the synergistic control cannot be achieved.
The power plant changes the quality of the water vapor due to various reasons and is not consistent with the condition of oxygenation, if the operation personnel can not stop oxygenation in time and improve the ammonia addition amount, the adverse effect of accelerating the corrosion of the water vapor system can be caused, and if the water vapor quality of the unit is qualified, if the oxidative full-volatilization treatment mode of only adding ammonia is continuously adopted, the safety and the economical efficiency of the unit are also unfavorable. Therefore, there is a need for an apparatus and method that allows for precise control of oxygenation and ammoniation systems.
Disclosure of Invention
In order to overcome the problems in the prior art, the utility model aims to provide a cooperative accurate control device for automatic oxygenation and ammoniation of power plant water supply, which can realize cooperative control of oxygenation and ammoniation according to the condition of water quality, and timely stop oxygenation when the water quality deteriorates, thereby ensuring the safe operation of a unit; when the water quality is qualified, oxygen is added and the ammonia adding amount is reduced, so that the corrosion of a water vapor system is effectively inhibited and the running economy of a unit is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a power plant feed water automatic oxygenation and ammonia adding cooperative accurate control device comprises a PLC automatic oxygenation and ammonia adding cooperative controller 8, a feed water oxygenation system and a condensed water ammonia adding system;
the water supply and oxygenation system comprises an oxygenation source 1 connected with an outlet oxygenation point of a deaerator 19, and an oxygenation pressure reducing valve 2, an oxygenation electric regulating valve 3, an oxygenation flow detector 4, an oxygenation voltage stabilizer 5, an oxygenation electric shutoff valve 6 and an oxygenation shutoff valve 7 are sequentially arranged on a pipeline connecting the outlet of the oxygenation source 1 and the outlet oxygenation point of the deaerator 19;
the condensed water ammoniation system comprises an ammonia solution tank 9 connected with an ammoniation point of a fine treatment outlet main pipe, wherein a pipeline connected with the ammoniation point of the fine treatment outlet main pipe at the outlet of the ammonia solution tank 9 is sequentially provided with an outlet ball valve 10, a Y-shaped filter 11, an ammoniation metering pump 12, an ammoniation flow detector 14, a pulse damper 15, a back pressure valve 16, a check valve 17 and an ammoniation stop valve 18, a pipeline between the ammoniation metering pump 12 and the ammoniation flow detector 14 is provided with a branch pipeline connected with the inlet of the ammonia solution tank 9, and a safety valve 13 is arranged on the branch pipeline;
the oxygen adding electric regulating valve 3, the oxygen adding electric shutoff valve 6 and the ammonia adding metering pump 12 are connected with the output end of the PLC automatic oxygen adding and ammonia adding cooperative controller 8, and the oxygen adding flow detector 4 and the ammonia adding flow detector 14 are connected with the input end of the PLC automatic oxygen adding and ammonia adding cooperative controller 8.
The oxygenation pressure reducing valve 2 in the water supply oxygenation system stabilizes the inlet pressure of the oxygenation electric regulating valve 3 to a certain value, the oxygenation voltage stabilizer 5 stabilizes the outlet pressure of the oxygenation electric regulating valve 3 to a certain value, the pressure difference between the inlet and the outlet of the oxygenation electric regulating valve 3 is certain at the moment, and the oxygenation flow can be controlled by controlling the valve opening of the electric regulating valve 3 to realize the accurate control of oxygenation amount;
the pulse damper 15 and the backpressure valve 16 in the condensed water ammonia adding system ensure that the ammonia adding flow rate and the frequency of the ammonia adding metering pump 12 are in a linear relation, and the ammonia adding flow rate is controlled by controlling the frequency of the ammonia adding metering pump 12 to realize the accurate control of ammonia adding.
The PLC automatic oxygenation and ammoniation cooperative controller 8 collects a feed water hydrogen conductivity signal, a unit load signal, a feed water dissolved oxygen signal and a deaerator inlet conductivity signal, and automatically controls oxygenation and ammoniation in a cooperative mode according to the feed water hydrogen conductivity value. When the conductivity of the hydrogen feed water is less than 0.15 mu S/cm, the opening of the oxygen adding electric regulating valve 3 and the frequency of the ammonia adding metering pump 12 are regulated, and the proper oxygen adding amount and ammonia adding amount are controlled; when the conductivity of the hydrogen fed water is greater than 0.15 mu S/cm, closing the oxygen-adding electric shutoff valve 6, stopping adding oxygen, adjusting the frequency of the ammonia-adding metering pump 12, and properly increasing the ammonia adding amount; when the oxygen adding needs to be manually stopped before the shutdown, the oxygen adding can be stopped by manually clicking on a human-computer interaction interface of the PLC automatic oxygen adding and ammonia adding cooperative controller 8, at the moment, the oxygen adding electric shutoff valve 6 is closed, the frequency of the ammonia adding metering pump 12 is improved, and the ammonia adding amount is increased to a set value. And the unit load is used as feedforward, the feedforward PID regulation is carried out on the added ammonia according to the comparison result of the measured value of the dissolved oxygen content of the feed water and the set value of the dissolved oxygen content, the accurate control of the added oxygen is realized, and the unit load is used as feedforward, and the feedforward PID regulation is carried out on the added ammonia according to the comparison result of the measured value of the conductivity of the inlet of the deaerator and the set value of the conductivity, so that the accurate control of the added ammonia is realized.
The utility model has the advantages of as follows:
1. the synergistic control of oxygenation and ammoniation can be realized according to the water quality condition, and the oxygenation is stopped in time when the water quality is deteriorated (the feed water hydrogen conductivity is more than 0.15 mu S/cm), so that the safe operation of the unit is ensured.
2. The synergistic control of oxygenation and ammoniation can be realized according to the condition of water quality, when the water quality is qualified (the conductivity of hydrogen feed water is less than 0.15 mu S/cm), oxygenation is carried out and the ammoniation amount is reduced, so that the corrosion of a water vapor system is effectively inhibited, and the running economy of a unit is improved.
3. The precise automatic control of the oxygen addition is realized through mature pressure reduction and pressure stabilization technology and feedforward PID regulation, and the oxygen addition amount does not need to be frequently regulated manually according to the load change.
4. The ammonia feeding is subjected to feedforward PID regulation to realize accurate and automatic ammonia feeding control, and the ammonia feeding amount does not need to be frequently regulated manually according to load change.
Drawings
FIG. 1 is a schematic structural diagram of a cooperative precise control device for oxygenation and ammoniation according to the present invention.
The specific implementation mode is as follows:
the following description will further explain embodiments of the present invention with reference to the accompanying drawings.
As shown in fig. 1, the utility model relates to a cooperative accurate control device for automatic oxygenation and ammoniation of power plant water supply, which comprises a PLC automatic oxygenation and ammoniation cooperative controller 8, a water supply oxygenation system and a condensed water ammoniation system; the water supply and oxygenation system comprises an oxygenation source 1 connected with an outlet oxygenation point of a deaerator 19, and an oxygenation pressure reducing valve 2, an oxygenation electric regulating valve 3, an oxygenation flow detector 4, an oxygenation voltage stabilizer 5, an oxygenation electric shutoff valve 6 and an oxygenation shutoff valve 7 are sequentially arranged on a pipeline connecting the outlet of the oxygenation source 1 and the outlet oxygenation point of the deaerator 19; the condensed water ammoniation system comprises an ammonia solution tank 9 connected with an ammoniation point of a fine treatment outlet main pipe, wherein a pipeline connected with the ammoniation point of the fine treatment outlet main pipe at the outlet of the ammonia solution tank 9 is sequentially provided with an outlet ball valve 10, a Y-shaped filter 11, an ammoniation metering pump 12, an ammoniation flow detector 14, a pulse damper 15, a back pressure valve 16, a check valve 17 and an ammoniation stop valve 18, a pipeline between the ammoniation metering pump 12 and the ammoniation flow detector 14 is provided with a branch pipeline connected with the inlet of the ammonia solution tank 9, and a safety valve 13 is arranged on the branch pipeline; the oxygen adding electric regulating valve 3, the oxygen adding electric shutoff valve 6 and the ammonia adding metering pump 12 are connected with the output end of the PLC automatic oxygen adding and ammonia adding cooperative controller 8, and the oxygen adding flow detector 4 and the ammonia adding flow detector 14 are connected with the input end of the PLC automatic oxygen adding and ammonia adding cooperative controller 8.
When water is supplied, as shown in FIG. 1Electrical conductivity of hydrogen<And when the concentration of the ammonia gas in the feed water is 0.15 mu S/cm, opening the oxygen-adding electric shutoff valve 6, adding oxygen to the feed water, controlling the lower ammonia adding amount, controlling the dissolved oxygen content of the feed water to be 10-50 mu g/L, and controlling the inlet conductivity of the deaerator to be 2.7-3.4 mu S/cm. At the moment, the PLC automatic oxygenation and ammoniation cooperative controller 8 carries out feedforward PID control on oxygenation and ammoniation, the unit load P is used as a feedforward signal, and the theoretical oxygenation flow Q is at the momentO1The set value D of the dissolved oxygen amount is equal to the unit load PO1In a certain condition, the ratio coefficient is set as KO，QO1＝KO×DO1X P, converting the theoretical oxygen adding flow into an opening command of an oxygen adding electric regulating valve 3 for oxygen adding, and simultaneously collecting the real-time dissolved oxygen D of the feed waterO2And is combined with the dissolved oxygen set value DO1Comparing, PID regulating the oxygen adding flow to obtain the actual oxygen adding flow QO2The actual oxygen adding flow rate QO2And the opening command is converted into a valve opening command to adjust the oxygen-adding electric regulating valve 3, so that the accurate control of oxygen addition is realized. The unit load P is taken as a feedforward signal, and the theoretical ammonia adding flow and Q are obtained at the momentA1With the unit load P at the ammonia concentration set value CA1In a certain condition, the ratio coefficient is set as KA，QA1＝KA×CA1X P, converting the theoretical ammonia adding flow into a frequency command of an ammonia adding metering pump 12 for adding ammonia, and acquiring an actual deaerator inlet conductivity value k to obtain an actual ammonia concentration CA2，CA2＝(13.039k2+62.638k)×10-3(mg/L), the actual ammonia concentration CA2With ammonia concentration setpoint CA1Comparing, PID regulating the ammonia adding flow to obtain the actual ammonia adding flow QA2The actual ammonia addition flow rate QA2And converting the frequency command into a metering pump frequency command to adjust the ammonia adding metering pump 12, thereby realizing the accurate control of ammonia adding.
And when the conductivity of the hydrogen supplied to the water is greater than 0.15 mu S/cm, automatically closing the oxygen-adding electric shutoff valve 6, stopping adding oxygen to the water and increasing the ammonia adding amount, and controlling the conductivity of the inlet of the deaerator to be 5.4-6.7 mu S/cm. At the moment, the PLC automatic oxygenation and ammonia addition cooperative controller 8 is used for carrying out feedforward PID control on the ammonia addition, and the accurate control of higher ammonia addition is realized.
When the set is stopped and the like, the oxygen adding can be stopped by manually clicking on a human-computer interaction interface of the PLC automatic oxygen adding and ammonia adding cooperative controller 8, the oxygen adding electric shutoff valve 6 is closed at the moment, meanwhile, the PLC automatic oxygen adding and ammonia adding cooperative controller 8 carries out feedforward PID control on the ammonia, the ammonia adding amount is improved, and the conductivity of the inlet of the deaerator is controlled to be 5.4-10.7 muS/cm.
Claims (1)
1. The utility model provides a power plant feedwater automatic oxygenation and adds accurate controlling means in coordination of ammonia which characterized in that: comprises a water supply oxygenation system, a condensed water ammoniation system and a PLC automatic oxygenation and ammoniation cooperative controller (8);
the water supply and oxygenation system comprises an oxygenation source (1) connected with an oxygenation point at the outlet of a deaerator (19), and an oxygenation pressure reducing valve (2), an oxygenation electric regulating valve (3), an oxygenation flow detector (4), an oxygenation voltage stabilizer (5), an oxygenation electric shutoff valve (6) and an oxygenation stop valve (7) are sequentially arranged on a pipeline connecting the outlet of the oxygenation source (1) and the oxygenation point at the outlet of the deaerator (19);
the condensed water ammoniation system comprises an ammonia solution tank (9) connected with an ammoniation point of a fine treatment outlet main pipe, an outlet ball valve (10), a Y-shaped filter (11), an ammoniation metering pump (12), an ammoniation flow detector (14), a pulse damper (15), a back pressure valve (16), a check valve (17) and an ammoniation stop valve (18) are sequentially arranged on a pipeline connected with the ammoniation point of the fine treatment outlet main pipe at the outlet of the ammonia solution tank (9), a branch pipeline is arranged on a pipeline between the ammoniation metering pump (12) and the ammoniation flow detector (14) and is connected with an inlet of the ammonia solution tank (9), and a safety valve (13) is arranged on the branch pipeline;
the oxygen adding electric regulating valve (3), the oxygen adding electric shutoff valve (6) and the ammonia adding metering pump (12) are connected with the output end of the PLC automatic oxygen adding and ammonia adding cooperative controller (8), and the oxygen adding flow detector (4) and the ammonia adding flow detector (14) are connected with the input end of the PLC automatic oxygen adding and ammonia adding cooperative controller (8).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110217900A (en) * | 2019-04-18 | 2019-09-10 | 西安热工研究院有限公司 | A kind of automatic oxygenation of power plant water supply and the collaboration precise control device and method of ammonification |
| CN112762432A (en) * | 2021-02-05 | 2021-05-07 | 西安热工研究院有限公司 | Gaseous high-pressure-increasing hydrophobic accurate oxygenation device and oxygenation method |
| CN113983451A (en) * | 2021-11-26 | 2022-01-28 | 广东大唐国际潮州发电有限责任公司 | Thermal power plant oxygenation system based on automatic oxygenation device closed-loop adjustment and adjustment method |
| CN114229980A (en) * | 2021-12-03 | 2022-03-25 | 山西三合盛智慧科技股份有限公司 | Automatic oxygenation and fluorination cooperative control device for power plant feed water and control method thereof |
-
2019
- 2019-04-18 CN CN201920526751.5U patent/CN209906468U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110217900A (en) * | 2019-04-18 | 2019-09-10 | 西安热工研究院有限公司 | A kind of automatic oxygenation of power plant water supply and the collaboration precise control device and method of ammonification |
| CN110217900B (en) * | 2019-04-18 | 2023-10-13 | 西安热工研究院有限公司 | Cooperative precise control device and method for automatic oxygenation and ammonia addition of power plant water supply |
| CN112762432A (en) * | 2021-02-05 | 2021-05-07 | 西安热工研究院有限公司 | Gaseous high-pressure-increasing hydrophobic accurate oxygenation device and oxygenation method |
| CN113983451A (en) * | 2021-11-26 | 2022-01-28 | 广东大唐国际潮州发电有限责任公司 | Thermal power plant oxygenation system based on automatic oxygenation device closed-loop adjustment and adjustment method |
| CN114229980A (en) * | 2021-12-03 | 2022-03-25 | 山西三合盛智慧科技股份有限公司 | Automatic oxygenation and fluorination cooperative control device for power plant feed water and control method thereof |
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