CN207738501U - A kind of boiler feedwater pH value self-checking device - Google Patents
A kind of boiler feedwater pH value self-checking device Download PDFInfo
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- CN207738501U CN207738501U CN201721673319.6U CN201721673319U CN207738501U CN 207738501 U CN207738501 U CN 207738501U CN 201721673319 U CN201721673319 U CN 201721673319U CN 207738501 U CN207738501 U CN 207738501U
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- ammonia
- medicine
- chest
- boiler
- polishing treatment
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Abstract
The utility model discloses a kind of boiler feedwater pH value self-checking devices, including the boiler being communicated on steam turbine, and the oxygen-eliminating device and low-pressure heater being sequentially communicated with boiler, low-pressure heater are respectively communicated with ammonia medicine-chest and condensate polishing treatment case, condensate polishing treatment case is connected to condenser；It further include a PLC control system for being connected to boiler, condensate polishing treatment case and ammonia medicine-chest；Ammonia medicine-chest is respectively communicated to raw material ammonia water feed system and DW system demineralized water system, and raw material ammonia water feed system and DW system demineralized water system are connected to by molten medicine injector with ammonia medicine-chest.By with the relationship than conductance, pH and ammonia solution concentration, determine the variation functional relation of condensate polishing treatment flow and ammonia pump frequency, ammonia pump frequency is set to change immediately with changes in flow rate, greatly solve the problems, such as that PID adjusting methods control lag, inertia are big, to realize the accurate adjusting of boiler feedwater pH value.With stable, control function is strong, networking outstanding feature.
Description
Technical field
The utility model is related to a kind of boiler feedwater pH value regulative mode, especially a kind of boiler feedwater pH value automatic adjustment
Device.
Background technology
Power Plant Feedwater ammonification is a kind of important boiler feedwater pH value regulative mode.With the hair of China's power industry
Exhibition, the especially operation of thermal power plant's high parameter large sized unit propose increasingly the control of Steam-water Quality and working condition of water quality
Strict requirements.Water quality adjustment strictly can be accurately carried out, the stabilization, economy and safety fortune of entire unit are directly related to
Row.It is the essential measure for avoiding being induced equipment fault and production accident by chemical reason, there are substantial economics and safety to imitate
Benefit.
The boiler feedwater pH value of domestic-developed automatically controls at present, is the simple algorithm for being all based on PID regulator mostly
Control, this can meet the requirements reluctantly in therrmodynamic system stable operation, but larger in load fluctuation, especially regulating units
When operation, feedwater flow has a greater change with the fluctuation of load, if dosage cannot variation synchronous with water, not only medicine
Product waste, and concentration is unsecured, directly affects treatment effect.At the same time, water supply pH value automatic adjustment controlled process disturbance because
Lag time length between plain more, dosing and detection and the fluctuation of concentration that makes up a prescription, are another distinct issues of medicine system, simply
PID adjusting satisfied control effect is not achieved, it may appear that adjust not in time with overshoot the phenomenon that, cause Control platform bad.
Utility model content
To solve drawbacks described above existing in the prior art, the purpose of this utility model is to provide it is a kind of it is stable,
Control function is strong, networking boiler feedwater pH value self-checking device.Using the system of 100% condensate polishing treatment, water supply
The water quality for having reached ultra-pure water, the water supply after ammonification are considered as the weak solution of ammonia, under the conditions of this kind, the ratio conductivity of water supply
(SC), pH, ammonia density (A), ammonia solution conductivity (DD) have certain functional relation between each other, pass through PLC control system pair
Each parameter is acquired in real time, after Data Analysis Services, is automatically adjusted to ammonia pump frequency (f), to reach to boiler
Water supply pH value carries out real-time auto-adjustment control.
The utility model is realized by following technical proposals.
A kind of boiler feedwater pH value self-checking device, including the boiler that is communicated on steam turbine, and successively with boiler
The oxygen-eliminating device and low-pressure heater of connection, low-pressure heater are respectively communicated with ammonia medicine-chest and condensate polishing treatment case, at condensate fine
It manages case and is connected to condenser；Wherein, further include a PLC control system for being connected to boiler, condensate polishing treatment case and ammonia medicine-chest；
Ammonia medicine-chest is respectively communicated to raw material ammonia water feed system and DW system demineralized water system, and raw material ammonia water feed system and DW system demineralized water system pass through
Molten medicine injector is connected to ammonia medicine-chest.
Further, the ammonia medicine-chest is equipped with the fluid level transmitter controlled by PLC control system, precision processing flowmeter, adds
Teat pipette and conductivity table；Conductivity table is mounted on the pipeline between molten medicine injector and ammonia medicine-chest, the installation of precision processing flowmeter
On condensate polishing treatment case, dosing pump connection dosing valve be located at below ammonia medicine-chest and with low-pressure heater and condensate polishing treatment
Case pipeline is connected to.
Further, solenoid valve and electric control valve are equipped between the raw material ammonia water feed system and molten medicine injector.
Further, the DW system demineralized water system is communicated to the pipeline of molten medicine injector equipped with solenoid valve.
Further, the pH tables controlled by PLC control system are equipped on boiler.
Further, PLC control system is equipped with than conductivity table.
The beneficial effects of the utility model are：
Boiler feedwater pH value self-checking device provided by the utility model and method can effectively solve the problem that during making up a prescription
Liquor strength is unstable, the problem of making up a prescription not in time.Also, by using the relational expression than conductance, pH and ammonia solution concentration, most
The variation functional relation for determining condensate polishing treatment flow and ammonia pump frequency eventually, makes ammonia pump frequency with changes in flow rate i.e. time-varying
Change, greatly solves the problems, such as that PID adjusting methods control lag, inertia are big, to realize the accurate adjusting of boiler feedwater pH value.
With stable, control function is strong, networking outstanding feature.
Description of the drawings
Fig. 1 is boiler feedwater pH value self-checking device structure diagram.
In figure：1, condenser；2, condensate pump；3, molten medicine injector；4, raw material ammonia water feed system；5, conductivity table；
6, ammonia medicine-chest；7, fluid level transmitter；8, precision processing flowmeter；9, dosing pump；10, frequency converter；11, PLC control system；12, it coagulates
Bear water precision processing case；13, low-pressure heater；14, than conductivity table；15, pH tables；16, steam turbine；17, boiler；18, oxygen-eliminating device.
Specific implementation mode
The utility model is described in further detail with reference to the accompanying drawings and examples, but is not intended as to this practicality
The novel foundation for doing any restrictions.
As shown in Figure 1, a kind of boiler feedwater pH value self-checking device is given, including the pot being communicated on steam turbine 16
Stove 17, and the oxygen-eliminating device 18 and low-pressure heater 13 that are sequentially communicated with boiler 17, low-pressure heater 13 are respectively communicated with ammonia medicine-chest 6
With condensate polishing treatment case 12, condensate polishing treatment case 12 is connected to condenser 1 by condensate pump 2；Further include one to be connected to
The PLC control system 11 of boiler 17, condensate polishing treatment case 12 and ammonia medicine-chest 6；Ammonia medicine-chest 6 is respectively communicated to raw material ammonia water supply
System 4 and DW system demineralized water system, raw material ammonia water feed system 4 and DW system demineralized water system are connected to by molten medicine injector 3 with ammonia medicine-chest 6.
Ammonia medicine-chest 6 is equipped with fluid level transmitter 7, precision processing flowmeter 8,9 and of dosing pump controlled by PLC control system 11
Conductivity table 5；Conductivity table 5 is mounted on the pipeline between molten medicine injector 3 and ammonia medicine-chest 6, and precision processing flowmeter 8 is mounted on
On condensate polishing treatment case 12.Solenoid valve and electric control valve are equipped between raw material ammonia water feed system 4 and molten medicine injector 3；
The pipeline that DW system demineralized water system is communicated to molten medicine injector 3 is equipped with solenoid valve.
The pH tables 15 controlled by PLC control system 11 are equipped on boiler 17；PLC control system 11 is equipped with than conductivity
Table 14；PLC control system 11 is connected to by frequency converter 10 on dosing pump 9.
Boiler feedwater sample point is located at oxygen-eliminating device down-comer, and sampled pipeline send to carbonated drink and concentrates sampling analytical system,
And it is monitored in real time than conductivity (SC), pH value, sample point to analysis system distance is about 300m；Chemical feeding points are located at condensate fine
At processing outlet main pipe；Automated dispensing and automatic medicament feeding system are arranged between dosing, and distance is about 350m between chemical feeding points and dosing,
It is specifically shown in Fig. 1.
The automatic adjustment of boiler feedwater pH value, which is divided into making up a prescription, to be automatically controlled and Automatic Dosage Control of Additives.
In the autocontrol method that makes up a prescription of the utility model, using demineralized water, ammonia density (A) and ammonia solution conductivity (DD)
With A=(13.2DD2+62.7DD)×10-3The mathematical relationship of mg/L, carries out auto-control Design of making up a prescription, and detailed process is：
1) when PLC control system detects that the level value that medicine-chest fluid level transmitter (LT) transmits is set less than operations staff
When fixed automated dispensing bottom level limit, automated dispensing control program starts automatically；
2) solenoid valve that makes up a prescription is opened, crack electric control valve forms automated dispensing fluid passage；
3) suction and mixing that liquid is carried out using molten medicine injector, start automated dispensing；
4) during making up a prescription, PLC control system detects the electric conductivity value and fortune that conductivity table after molten medicine injector transmits
Administrative staff's established standards value is compared automatically, according to comparison result adjust automatically motorized adjustment valve opening, to ensure to make up a prescription
Liquor strength automatic stabilisation is in standard claimed range in the process；
5) process is persistently carried out, until PLC control system detects the liquid level that medicine-chest fluid level transmitter (LT) transmits
When value is higher than the automated dispensing liquid level upper limit value that operations staff sets, automated dispensing control program is automatically stopped, closing solenoid valve,
Electric control valve.
Automatic Dosage Control of Additives
Using the system of 100% Ion exchange resin, the content of the carbon dioxide in therrmodynamic system can consider equal to zero,
In this case, have stringent mathematical relationship between the conductivity of water supply, pH, ammonia residual, be shown in Table 1, with this theory for according to
According to ammonia pump frequency (f) and condensate polishing treatment total flow (Q) functional relation f=kQ is established, wherein k is correction factor.
1 feedwater conductivity of table, pH, ammonia residual specific function relationship
Automatic control flow chart：
1) operations staff manually sets water supply pH control targe values in PLC control system；
2) PLC control system calculates the ratio electricity of corresponding water supply pH value by water supply pH value with than the functional relation of conductivity
Conductivity value is compared in conductivity value, i.e., theoretical control；
3) the PLC control system functional relation by water supply than conductivity and ammonia density again calculates corresponding this and compares conductance
The ammonia density of rate value, i.e., theoretical control water supply ammonia density；
4) it is bent that corresponding feedwater flow and condensate polishing treatment total flow (Q) correction under unit different load operating mode are drawn
Line fits correction coefficient k；
5) corresponding water supply ammonia residual in the case of unit difference feedwater flow is calculated, so that it is determined that going out the corresponding water supply stream
The theoretical ammonia residual of the condensate polishing treatment total flow of amount；
6) PLC control system adjusts the practical dosage of ammonium hydroxide by adjusting the frequency of ammonification pump, to reach theory
The theoretical ammonia residual of condensate polishing treatment total flow may thereby determine that out that different unit loads and the function of ammonia pump frequency close
System, f=kQ；
7) water supply is sent to PLC control system than conductivity (SC) actual measured value, to the frequency of ammonium hydroxide dosing pump into
Row combined type automatically adjusts.
By make up a prescription automatically control, Automatic Dosage Control of Additives realize water supply pH value automatic adjustment be precisely controlled.
The utility model is not limited to above-described embodiment, on the basis of technical solution disclosed by the utility model, this
For the technical staff in field according to disclosed technology contents, not needing performing creative labour can be special to some of which technology
Sign makes some and replaces and deform, these are replaced and deformation is within the protection scope of the present utility model.
Claims (6)
1. a kind of boiler feedwater pH value self-checking device, which is characterized in that including the boiler being communicated on steam turbine (16)
(17), the oxygen-eliminating device (18) and low-pressure heater (13) and with boiler (17) being sequentially communicated, low-pressure heater (13) connect respectively
Logical ammonia medicine-chest (6) and condensate polishing treatment case (12), condensate polishing treatment case (12) are connected to condenser (1)；It further include a company
It is connected to the PLC control system (11) of boiler (17), condensate polishing treatment case (12) and ammonia medicine-chest (6)；Ammonia medicine-chest (6) is respectively communicated with
To raw material ammonia water feed system (4) and DW system demineralized water system, raw material ammonia water feed system (4) and DW system demineralized water system are sprayed by molten medicine
Device (3) is connected to ammonia medicine-chest (6).
2. a kind of boiler feedwater pH value self-checking device according to claim 1, which is characterized in that the ammonia medicine-chest
(6) it is equipped with fluid level transmitter (7), precision processing flowmeter (8), dosing pump (9) and the conductance controlled by PLC control system (11)
Rate table (5)；Conductivity table (5) is mounted on the pipeline between molten medicine injector (3) and ammonia medicine-chest (6), precision processing flowmeter (8)
On condensate polishing treatment case (12), dosing pump (9) connection dosing valve is located at below ammonia medicine-chest (6) and and low-pressure heater
(13) it is connected to condensate polishing treatment case (12) pipeline.
3. a kind of boiler feedwater pH value self-checking device according to claim 1, which is characterized in that the raw material ammonia water
Solenoid valve and electric control valve are equipped between feed system (4) and molten medicine injector (3).
4. a kind of boiler feedwater pH value self-checking device according to claim 1, which is characterized in that the desalination water system
The pipeline that system is communicated to molten medicine injector (3) is equipped with solenoid valve.
5. a kind of boiler feedwater pH value self-checking device according to claim 1, which is characterized in that on boiler (17)
Equipped with the pH tables (15) controlled by PLC control system (11).
6. a kind of boiler feedwater pH value self-checking device according to claim 1, which is characterized in that PLC control system
(11) it is equipped with than conductivity table (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721673319.6U CN207738501U (en) | 2017-12-05 | 2017-12-05 | A kind of boiler feedwater pH value self-checking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721673319.6U CN207738501U (en) | 2017-12-05 | 2017-12-05 | A kind of boiler feedwater pH value self-checking device |
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| CN207738501U true CN207738501U (en) | 2018-08-17 |
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ID=63117248
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| CN201721673319.6U Active CN207738501U (en) | 2017-12-05 | 2017-12-05 | A kind of boiler feedwater pH value self-checking device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109876704A (en) * | 2019-04-08 | 2019-06-14 | 华润电力（沧州运东）有限公司 | With ammonia device and with its generating set |
| CN110657418A (en) * | 2019-10-09 | 2020-01-07 | 润电能源科学技术有限公司 | Hydrophobic corrosion protection system and corrosion protection method thereof |
| CN110686230A (en) * | 2019-10-10 | 2020-01-14 | 王彦淳 | Method for adjusting pH value of boiler feed water |
| CN110794883A (en) * | 2019-11-28 | 2020-02-14 | 湖北华电江陵发电有限公司 | Control method and system for automatically adding ammonia into condensed water of power plant |
| CN112361322A (en) * | 2020-10-27 | 2021-02-12 | 西安热工研究院有限公司 | Boiler feed water automatic ammonia adding device and gray prediction feedforward PID control method |
| CN112650050A (en) * | 2020-11-23 | 2021-04-13 | 贵州金元茶园发电有限责任公司 | Chemical ammonia addition automatic control method based on data modeling and multi-feedforward PID |
| CN113063139A (en) * | 2021-03-10 | 2021-07-02 | 华电电力科学研究院有限公司 | Intelligent dosing method for boiler |
| CN114956219A (en) * | 2022-05-24 | 2022-08-30 | 华能兰州热电有限责任公司 | Automatic control method and system for chemical ammonia addition of thermal power plant |
-
2017
- 2017-12-05 CN CN201721673319.6U patent/CN207738501U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109876704A (en) * | 2019-04-08 | 2019-06-14 | 华润电力（沧州运东）有限公司 | With ammonia device and with its generating set |
| CN110657418A (en) * | 2019-10-09 | 2020-01-07 | 润电能源科学技术有限公司 | Hydrophobic corrosion protection system and corrosion protection method thereof |
| CN110686230A (en) * | 2019-10-10 | 2020-01-14 | 王彦淳 | Method for adjusting pH value of boiler feed water |
| CN110794883A (en) * | 2019-11-28 | 2020-02-14 | 湖北华电江陵发电有限公司 | Control method and system for automatically adding ammonia into condensed water of power plant |
| CN110794883B (en) * | 2019-11-28 | 2023-05-23 | 湖北华电江陵发电有限公司 | Control method and system for automatic ammonia addition of condensation water of power plant |
| CN112361322A (en) * | 2020-10-27 | 2021-02-12 | 西安热工研究院有限公司 | Boiler feed water automatic ammonia adding device and gray prediction feedforward PID control method |
| CN112650050A (en) * | 2020-11-23 | 2021-04-13 | 贵州金元茶园发电有限责任公司 | Chemical ammonia addition automatic control method based on data modeling and multi-feedforward PID |
| CN112650050B (en) * | 2020-11-23 | 2022-07-01 | 贵州金元茶园发电有限责任公司 | Chemical ammonia addition automatic control method based on data modeling and multi-feedforward PID |
| CN113063139A (en) * | 2021-03-10 | 2021-07-02 | 华电电力科学研究院有限公司 | Intelligent dosing method for boiler |
| CN114956219A (en) * | 2022-05-24 | 2022-08-30 | 华能兰州热电有限责任公司 | Automatic control method and system for chemical ammonia addition of thermal power plant |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20181207 Address after: 713302 Four Groups of Xinxing Village, Xuelu Town, Qianxian County, Xianyang City, Shaanxi Province Patentee after: Li Guozhu Address before: 710065 Room 1906, Unit 2, Unit 1, Building 1, Yicuiyuan-Xi'an (Phase 2), East of Tang Yannan Road, Xi'an High-tech Zone, Shaanxi Province Patentee before: Qi Yue |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191224 Address after: Room 1906, unit two, building one, yicuiyuan (phase two), the east side of Tangyan South Road, hi tech Zone, Xi'an City, Shaanxi province 710065 Patentee after: Xi'an Kemei Power Technology Service Co. Ltd. Shen Address before: 713302 Four Groups of Xinxing Village, Xuelu Town, Qianxian County, Xianyang City, Shaanxi Province Patentee before: Li Guozhu |