CN207129997U - Thermal System of Fossil Fuel-Fired Power Station segmentation pH adjustment systems - Google Patents
Thermal System of Fossil Fuel-Fired Power Station segmentation pH adjustment systems Download PDFInfo
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- CN207129997U CN207129997U CN201720822542.6U CN201720822542U CN207129997U CN 207129997 U CN207129997 U CN 207129997U CN 201720822542 U CN201720822542 U CN 201720822542U CN 207129997 U CN207129997 U CN 207129997U
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- ammonia solution
- power station
- fossil fuel
- fired power
- adjustment
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Abstract
A kind of Thermal System of Fossil Fuel-Fired Power Station segmentation pH adjustment systems are the utility model is related to, therrmodynamic system segmentation pH adjustment controls can be realized, water supply system and Drainage System of Low-pressure Heater is in the operating mode for preventing flowing accelerated corrosion and is designed.The utility model includes ammonia solution compounding system and Automatic Dosage Control of Additives system；Its method of adjustment, the low concentration ammonia aqueous solution is prepared using ammonia solution compounding system, using the low concentration ammonia aqueous solution as pH regulators, therrmodynamic system is carried out to be segmented pH adjustment by orienting dosing pipe, water supply system and Drainage System of Low-pressure Heater is in the operating mode for preventing flowing accelerated corrosion；The utility model solves the problems, such as that stokehold water supply system and Drainage System of Low-pressure Heater easily occur to flow accelerated corrosion, while can substantially reduce hydrophobic middle iron-holder to adverse effect caused by therrmodynamic system.
Description
Technical field
Thermal power plant's water-chemical regime field is the utility model is related to, more particularly to a kind of new Thermal System of Fossil Fuel-Fired Power Station point
Section pH adjustment systems and processing method.
Background technology
Improve water pH value be acknowledged as suppress therrmodynamic system occur flowing accelerated corrosion, reduce boiler heating surface in,
The advanced water treatment technology of low-temperature zone scaling rate.Traditional Thermal System of Fossil Fuel-Fired Power Station pH adjustment system is mixed in condensate polishing treatment
Bed outlet main pipe, oxygen-eliminating device down-comer, cold water startup chemical feeding points addition ammonia spirit is closed, controls its pH value to be maintained at alkalescent,
Therrmodynamic system steam flow is alkalized step by step, suppress the dissolution of iron ion in therrmodynamic system.But the ammoniacal liquor used due to adjustment pH
Distribution coefficient with temperature, pressure change and change, in Drainage System of Low-pressure Heater ammoniacal liquor be more easy to gas phase (condenser side) turn
Move, cause concentration of iron increase in Drainage System of Low-pressure Heater, accelerate the frequent generation of Drainage System of Low-pressure Heater flowing accelerated corrosion problem,
Conventional heat system pH methods of adjustment have exposed its drawback.In order to avoid due in Drainage System of Low-pressure Heater ammoniacal liquor to gas phase
Adverse effect caused by transfer, many units carry out changing the maintenance such as pipe after flowing accelerated corrosion occurs for low plus hydrophobic pipeline, but
Can not fundamentally solve the problems, such as the flowing accelerated corrosion of Drainage System of Low-pressure Heater.On the other hand, contain in the low plus hydrophobic being recovered
There is substantial amounts of iron ion, after these iron ions enter follow-up therrmodynamic system, the scaling rate of boiler heating surface can be accelerated, cause pot
Stove water screen tube booster.
In view of above-mentioned, the design people is actively subject to research and innovation, is adjusted to found a kind of Thermal System of Fossil Fuel-Fired Power Station segmentation pH
Whole system, make it with more the value in industry.
Utility model content
In order to solve the above technical problems, the purpose of this utility model is to provide a kind of Thermal System of Fossil Fuel-Fired Power Station segmentation pH adjustment
System, both solved the problems, such as that stokehold water supply system and Drainage System of Low-pressure Heater easily occurred to flow accelerated corrosion, boiler heating surface knot
The problem of dirty speed is high, hydrophobic middle iron-holder can be substantially reduced again to adverse effect caused by therrmodynamic system.
The utility model Thermal System of Fossil Fuel-Fired Power Station segmentation pH adjustment systems, including：Ammonia solution compounding system and dosing are automatic
Control system, the ammonia solution compounding system include ammonia solution case, the demineralized water that the inlet of the ammonia solution case is respectively communicated with
Come water lines, concentrated ammonia liquor bucket pipeline, the concentrated ammonia liquor bucket pipeline is provided with concentrated ammonia liquor bucket delivery pump, is provided with the ammonia solution case
Ammonia solution box mixer, the ammonia solution upper box part, which is provided with, drives the ammonia solution case of the ammonia solution box mixer to stir electricity
Machine, the delivery port connection outlet pipeline of the ammonia solution case；The Automatic Dosage Control of Additives system includes PLC, is arranged on
Measuring pump on the outlet pipeline, the measuring pump electrically connect the PLC, and the outlet pipeline passes through some dosings
Branch pipe is respectively communicated with the outlet of condensate polishing treatment mixed bed main pipe, the oxygen-eliminating device down-comer of Thermal System of Fossil Fuel-Fired Power Station, closes cold water startup
Side and low plus hydrophobic steam side.
Further, the ammonia solution box installed has magnetic double level gauge, and magnetic double level gauge is connected with liquid level sensor, institute
State liquid level sensor electrical connection PLC.
Further, magnetic valve is respectively equipped with each dosing branch pipe, the magnetic valve is electrically connected the PLC controls
Device processed.
Further, connect and be respectively provided with flow sensor, pH on each dosing branch pipe of the outlet pipeline
Table is detected, described flow sensor, pH detections table are connected with described PLC.
Compared with prior art, the utility model Thermal System of Fossil Fuel-Fired Power Station segmentation pH adjustment system has advantages below：
The utility model increases low plus hydrophobic steam side chemical feeding points newly, can effectively avoid because ammoniacal liquor is easily to gas phase condenser
Side is shifted, and causes concentration of iron increase in Drainage System of Low-pressure Heater, the frequent generation of Drainage System of Low-pressure Heater flowing accelerated corrosion problem
Problem.After Tthe utility model system, the pH of low plus hydrophobic steam side can be made to control (the oxidisability water chemistry work more than 9.3
Condition) or more than 9.7 (reproducibility water-chemical regimes), according to the correlation theory and experimental data for suppressing flowing accelerated corrosion, not
Using under the oxidisability water-chemical regime of the reducing agents such as hydrazine, the pH to more than 9.3 of the aqueous solution is improved；Using the reduction such as hydrazine
Under the reproducibility water-chemical regime of agent, the pH to more than 9.7 of the aqueous solution is improved, can fully suppress to flow the hair of accelerated corrosion
It is raw.In addition, the pH by improving Drainage System of Low-pressure Heater, reduces the content of iron ion in low plus hydrophobic, slow down boiler and be heated
The scaling rate in face, the pickling cycle of boiler is extended, sufficiently lower the booster probability of boiler water-wall tube.The system and side
Method can give full play to pH and suppress the superiority that flowing accelerated corrosion occurs for Drainage System of Low-pressure Heater, to improving thermal power generation unit operation
Security and economy it is significant.
Only it is the general introduction of technical solutions of the utility model using described above, in order to better understand the utility model
Technological means, and can be practiced according to the content of specification, with preferred embodiment of the present utility model and coordinate attached below
Figure is described in detail as after.
Brief description of the drawings
Fig. 1 the utility model Thermal System of Fossil Fuel-Fired Power Station segmentation pH adjustment system schematics.
Embodiment
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.Below
Embodiment is used to illustrate the utility model, but is not limited to the scope of the utility model.
Embodiment 1
As shown in figure 1, the present embodiment Thermal System of Fossil Fuel-Fired Power Station segmentation pH adjustment systems, including：Ammonia solution compounding system and
Automatic Dosage Control of Additives system, the ammonia solution compounding system include ammonia solution case 6, and the inlet of the ammonia solution case is respectively communicated with
Demineralized water come water lines 1, concentrated ammonia liquor bucket pipeline 2, the concentrated ammonia liquor bucket pipeline is provided with concentrated ammonia liquor bucket delivery pump 3, the ammonia
Ammonia solution box mixer 4 is provided with liquor box, the ammonia solution upper box part is provided with the ammonia for driving the ammonia solution box mixer
Liquor box stirring motor 5, the delivery port connection outlet pipeline of the ammonia solution case；The Automatic Dosage Control of Additives system includes PLC
Controller 10, the measuring pump being arranged on the outlet pipeline, the measuring pump 9 electrically connect the PLC, the water outlet
The condensate polishing treatment mixed bed that pipeline is respectively communicated with Thermal System of Fossil Fuel-Fired Power Station by some dosing branch pipes is exported under main pipe, oxygen-eliminating device
Drop pipe, close cold water startup side and low plus hydrophobic steam side.Connect and divide equally on each dosing branch pipe of the outlet pipeline
Not She You flow sensor, pH detection table, described flow sensor, pH detections table are connected with described PLC.
Demineralized water come water lines 1 the demineralized water produced using demineralized water between chemistry waterwheel processed, after pressure-reducing valve depressurizes,
Enter ammonia solution case 6 from the top of ammonia solution case 6.Then, the concentrated ammonia liquor of the concentration 25% of purchase, conveyed successively by concentrated ammonia liquor bucket
Enter the bottom of ammonia solution case 6 along concentrated ammonia liquor transfer pipeline after pump 3, pressure-reducing valve decompression, enter ammonia solution through concentrated ammonia liquor water dispensing apparatus
Case 6, carry out water in water lines 1 with demineralized water and be sufficiently mixed dilution.At the same time it is arranged on the ammonia solution case on the top of ammonia solution case 6
Stirring motor 5 drives ammonia solution box mixer 4 to rotate, and mixes demineralized water water and concentrated ammonia solution.
Automatic Dosage Control of Additives system is injected separately into condensate polishing treatment mixed bed by dosing measuring pump 9 and exports main pipe, deoxygenation
Device down-comer, cold water startup chemical feeding points and low plus hydrophobic steam side are closed, measuring pump 9 exports female with condensate polishing treatment mixed bed
Pipe, oxygen-eliminating device down-comer feed water, close the flow progress proportion adjustment of cold water startup and low plus hydrophobic steam side, with pH detection tables
Feedback letter value carries out PID regulations, by PLC 10, condensate polishing treatment mixed bed is exported main pipe, oxygen-eliminating device down-comer,
The dosing flow progress automatic and accurate adjustment that cold water starts chemical feeding points and low plus hydrophobic steam side is closed, makes low plus hydrophobic steam side
PH control more than 9.3 (oxidisability water-chemical regimes) or more than 9.7 (reproducibility water-chemical regimes)；So as to effectively suppress low
Add hydrophobic flowing accelerated corrosion.Medicine system is provided with a stand-by pump, can be isolated when running dosing pump exception using standby
Pump carries out dosing.
The present embodiment operation principle specifically includes：
Step 1：Ammonia solution compounding system produces ammonia solution：Demineralized water carrys out water lines 1 and enters the top of ammonia solution case 6, meanwhile,
The bottom of ammonia solution case 6 is delivered into through concentrated ammonia liquor bucket delivery pump 3 from the concentrated ammonia liquor of concentrated ammonia liquor bucket pipeline 2, with demineralized water water
Water mixes in pipeline 1, and the ammonia solution case stirring motor 5 for being arranged on the top of ammonia solution case 6 drives 4 turns of ammonia solution box mixer
It is dynamic, mix demineralized water water and concentrated ammonia solution.
Step 2：Automatic Dosage Control of Additives system carries out being segmented pH adjustment processing by orienting dosing to Thermal System of Fossil Fuel-Fired Power Station,
Chemical feeding points, which are separately positioned on the outlet of condensate polishing treatment mixed bed main pipe, oxygen-eliminating device down-comer, close cold water starts chemical feeding points and low
Add hydrophobic steam side, measuring pump 9 exports main pipe, the feedwater of oxygen-eliminating device down-comer according to condensate polishing treatment mixed bed, closes cold water startup
The feedback signal of table is detected with the flow signal and PH of low plus hydrophobic steam side, and is adjusted automatically by PLC 10
Whole chemical feeding quantity, the pH of low plus hydrophobic steam side is controlled more than 9.3 oxidisability water-chemical regimes or more than 9.7 reproducibility water chemistry
Operating mode.
In the present embodiment, the pH of low plus hydrophobic steam side is controlled more than 9.3 (oxidisability water-chemical regime) or more than 9.7
(reproducibility water-chemical regime).The ammonia solution concentration is 0.5%.
Embodiment 2
The present embodiment Thermal System of Fossil Fuel-Fired Power Station segmentation pH adjustment systems, on the basis of embodiment 1, in order that entering demineralized water
Dynamic equilibrium is maintained with entering concentrated ammonia liquor, so as to keep being configured to 0.5% ammonia solution.The ammonia solution box installed has magnetic turnover panel liquid level
Meter, magnetic double level gauge 7 are connected with liquid level sensor 8, and the liquid level sensor electrically connects PLC, the PLC
The liquid level data exported according to liquid level sensor, liquid level in ammonia solution case is controlled to maintain at predetermined fluid level.It is each in order to realize
The chemical feeding quantity of dosing branch pipe is precisely controlled, and is respectively equipped with magnetic valve on each dosing branch pipe, the magnetic valve is electrically connected respectively
Connect the PLC.
Described above is only preferred embodiment of the present utility model, is not limited to the utility model, it is noted that
For those skilled in the art, on the premise of the utility model technical principle is not departed from, can also do
Go out some improvement and modification, these improvement and modification also should be regarded as the scope of protection of the utility model.
Claims (4)
- A kind of 1. Thermal System of Fossil Fuel-Fired Power Station segmentation pH adjustment systems, it is characterised in that including：Ammonia solution compounding system and dosing are certainly Autocontrol system, the ammonia solution compounding system include ammonia solution case, the desalination that the inlet of the ammonia solution case is respectively communicated with Water comes water lines, concentrated ammonia liquor bucket pipeline, and the concentrated ammonia liquor bucket pipeline is provided with concentrated ammonia liquor bucket delivery pump, set in the ammonia solution case There is ammonia solution box mixer, the ammonia solution upper box part, which is provided with, drives the ammonia solution case of the ammonia solution box mixer to stir electricity Machine, the delivery port connection outlet pipeline of the ammonia solution case；The Automatic Dosage Control of Additives system includes PLC, is arranged on Measuring pump on the outlet pipeline, the measuring pump electrically connect the PLC, and the outlet pipeline passes through some dosings Branch pipe is respectively communicated with the outlet of condensate polishing treatment mixed bed main pipe, the oxygen-eliminating device down-comer of Thermal System of Fossil Fuel-Fired Power Station, closes cold water startup Side and low plus hydrophobic steam side.
- 2. Thermal System of Fossil Fuel-Fired Power Station segmentation pH adjustment systems according to claim 1, it is characterised in that the ammonia solution case Equipped with magnetic double level gauge, magnetic double level gauge is connected with liquid level sensor, and the liquid level sensor electrically connects PLC.
- 3. Thermal System of Fossil Fuel-Fired Power Station segmentation pH adjustment systems according to claim 1, it is characterised in that each dosing branch Magnetic valve is respectively equipped with pipe, the magnetic valve is electrically connected the PLC.
- 4. Thermal System of Fossil Fuel-Fired Power Station segmentation pH adjustment systems according to claim 1, it is characterised in that connect the water outlet Flow sensor, pH detection tables are respectively provided with each dosing branch pipe of pipeline, described flow sensor, pH detection tables are equal It is connected with described PLC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720822542.6U CN207129997U (en) | 2017-07-07 | 2017-07-07 | Thermal System of Fossil Fuel-Fired Power Station segmentation pH adjustment systems |
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|---|---|---|---|
| CN201720822542.6U CN207129997U (en) | 2017-07-07 | 2017-07-07 | Thermal System of Fossil Fuel-Fired Power Station segmentation pH adjustment systems |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107381763A (en) * | 2017-07-07 | 2017-11-24 | 大唐东北电力试验研究所有限公司 | Thermal System of Fossil Fuel-Fired Power Station segmentation pH adjustment system and methods |
-
2017
- 2017-07-07 CN CN201720822542.6U patent/CN207129997U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107381763A (en) * | 2017-07-07 | 2017-11-24 | 大唐东北电力试验研究所有限公司 | Thermal System of Fossil Fuel-Fired Power Station segmentation pH adjustment system and methods |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180323 Termination date: 20180707 |