CN115161629A - Automatic dosing system and method for chemical cleaning and passivation process of power station boiler - Google Patents
Automatic dosing system and method for chemical cleaning and passivation process of power station boiler Download PDFInfo
- Publication number
- CN115161629A CN115161629A CN202210924449.1A CN202210924449A CN115161629A CN 115161629 A CN115161629 A CN 115161629A CN 202210924449 A CN202210924449 A CN 202210924449A CN 115161629 A CN115161629 A CN 115161629A
- Authority
- CN
- China
- Prior art keywords
- cleaning
- chemical
- dosing
- pump
- passivation process
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 128
- 239000000126 substance Substances 0.000 title claims abstract description 87
- 238000002161 passivation Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 68
- 230000008569 process Effects 0.000 title claims abstract description 56
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 76
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 38
- 238000012806 monitoring device Methods 0.000 claims abstract description 30
- 238000005070 sampling Methods 0.000 claims abstract description 23
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 239000003795 chemical substances by application Substances 0.000 claims description 24
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 10
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 claims description 6
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims description 6
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 5
- PXAJQJMDEXJWFB-UHFFFAOYSA-N acetone oxime Chemical compound CC(C)=NO PXAJQJMDEXJWFB-UHFFFAOYSA-N 0.000 claims description 5
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 4
- FZENGILVLUJGJX-NSCUHMNNSA-N (E)-acetaldehyde oxime Chemical compound C\C=N\O FZENGILVLUJGJX-NSCUHMNNSA-N 0.000 claims description 3
- 238000011217 control strategy Methods 0.000 claims description 3
- 235000010288 sodium nitrite Nutrition 0.000 claims description 3
- 230000001186 cumulative effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 8
- 239000003814 drug Substances 0.000 description 17
- 230000006872 improvement Effects 0.000 description 9
- 229940079593 drug Drugs 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000012459 cleaning agent Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000013486 operation strategy Methods 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
- C23C22/77—Controlling or regulating of the coating process
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Control Of Non-Electrical Variables (AREA)
Abstract
The invention discloses an automatic dosing system and method for a chemical cleaning and passivation process of a power station boiler, wherein the system comprises a cleaning box, a cleaning pump, an ammonia adding device, a sampling and cooling device, an online pH monitoring device, a dosing control device and a passivating agent adding device; an outlet of the cleaning box is sequentially connected with a cleaning pump and a chemical cleaning system, and an outlet of the chemical cleaning system is connected with an inlet of the cleaning box; the inlet of the sampling cooling device is connected with the outlet of the cleaning pump; the outlets of the ammonia adding device and the passivating agent adding device are connected with the cleaning box; the online pH monitoring device is arranged on the outlet of the sampling cooling device; the ammonia adding device and the passivator adding device are both electrically connected with the output end of the chemical adding control device, and the online pH monitoring device is electrically connected with the input end of the chemical adding control device. The method realizes automatic control of the passivation process, has high dosing efficiency, reduces the labor intensity of personnel, has high pH control precision, is easy to realize and has stable passivation effect.
Description
Technical Field
The invention belongs to the technical field of chemical cleaning, and particularly relates to an automatic dosing system and method for a chemical cleaning and passivation process of a power station boiler.
Background
Chemical cleaning is an effective method for removing scale, oxide skin and corrosion products on the inner surface of a heat exchange tube of a boiler of an electricity station, and can obviously improve the heat exchange efficiency of the boiler and ensure the economic, safe and effective operation of the boiler. The chemical cleaning of the power station boiler comprises the technological processes of acid cleaning, water washing after acid cleaning, rinsing, passivation and the like. After the metal inner surface of the heating surface of the power station boiler is acid-washed, scaling substances, oxide skin and corrosion products on the metal surface are dissolved by a cleaning agent, the active metal surface is exposed, and a layer of protective film is formed on the metal surface again by using a chemical agent in the passivation process to prevent the metal surface from being corroded again. A passivation film with good protection is formed in the chemical cleaning step, so that the cold state and hot state flushing time of a unit during starting is favorably shortened, the water and fuel consumption during starting is saved, and the passivation is an important step for ensuring the cleaning quality.
The chemical cleaning and passivation dosing process of the power station boiler is usually controlled manually, periodic sampling is needed to test the pH value, and the dosing control accuracy is low. Due to the lack of automatic control, the labor intensity of personnel is high, the cost of personnel is high, and the working efficiency is low.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide an automatic dosing system and method for a chemical cleaning and passivation process of a power station boiler. The chemical cleaning agent is suitable for adding chemicals in various passivation processes during chemical cleaning of boilers of various types.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an automatic chemical feeding system for a chemical cleaning and passivation process of a power station boiler comprises a cleaning box, a cleaning pump, an ammonia feeding device, a sampling and cooling device, an online pH monitoring device, a chemical feeding control device and a passivator feeding device;
an outlet of the cleaning box is sequentially connected with a cleaning pump and a chemical cleaning system, and an outlet of the chemical cleaning system is connected with an inlet of the cleaning box; the inlet of the sampling cooling device is connected with the outlet of the cleaning pump; the outlets of the ammonia adding device and the passivating agent adding device are connected with the cleaning box;
the online pH monitoring device is arranged on the outlet of the sampling cooling device;
the ammonia adding device and the passivating agent adding device are electrically connected with the output end of the chemical adding control device, and the online pH monitoring device is electrically connected with the input end of the chemical adding control device.
As a further improvement of the invention, the ammonia adding device comprises a concentrated ammonia water tank and a variable-frequency metering ammonia adding pump, the ammonia adding device is connected to an inlet of the cleaning tank or the cleaning pump, and the variable-frequency metering ammonia adding pump is electrically connected with the chemical adding control device.
As a further improvement of the invention, the passivator feeding device comprises a passivator dissolving medicine box, a variable-frequency metering medicine feeding pump and a flowmeter, wherein the variable-frequency metering medicine feeding pump is electrically connected with the medicine feeding control device.
As a further improvement of the invention, the outlet of the on-line pH monitoring device is connected to a cleaning tank.
As a further improvement of the chemical cleaning system, the chemical cleaning system flow meter is further included, the chemical cleaning system flow meter is connected to a cleaning system main pipeline at the outlet of the cleaning pump, and the chemical cleaning system flow meter is electrically connected with the input end of the dosing control device.
As a further improvement of the invention, the drug adding control device comprises a drug adding control PLC and a PLC display screen, and the drug adding control PLC is electrically connected with the PLC display screen.
A control method of an automatic dosing system for a chemical cleaning and passivation process of a power station boiler comprises two operation modes:
the operation mode A is as follows:
starting an ammonia adding device to adjust the pH value of the cleaning system to a set value, then starting a passivator adding device, and stopping the operation of the chemical adding system after the pH value adjustment is finished and the passivator is added;
operation mode B:
and simultaneously starting the ammonia adding device and the passivator adding device to adjust the pH value of the system in the process of adding the passivator, and stopping the operation of the chemical adding system after the pH value is adjusted and the passivator is added.
As a further improvement of the invention, the passivating agent adding device controls the frequency of the variable-frequency metering chemical feeding pump according to a proportional factor K, the control strategy is that the example factor K is equal to the flow display value of the passivating agent adding device divided by the flow meter display value of the chemical cleaning system, and the passivating agent adding device stops running when the accumulated chemical feeding volume of the flow meter in the passivating agent adding device in the chemical feeding process is equal to the set adding volume.
As a further improvement of the invention, a hydrogen peroxide passivation process, an EDTA passivation process, an acetone oxime passivation process, an acetaldoxime passivation process, a hydrazine passivation process or a sodium nitrite passivation process is adopted in the passivator adding device.
Compared with the prior art, the invention has the following advantages:
the automatic dosing system for the chemical cleaning and passivation process of the power station boiler is easy to realize, the passivation process is automatically controlled, the online pH monitoring device can acquire pH information in real time through the control of the adding amount of the ammonia adding device and the passivating agent adding device, the passivation process is automatically controlled, the dosing efficiency is high, the labor intensity of personnel is reduced, the pH control precision is high, and the passivation effect is stable. The chemical cleaning agent is suitable for adding chemicals in various passivation processes during chemical cleaning of boilers of various types.
Drawings
FIG. 1 is a schematic view of an automatic chemical feeding system for a chemical cleaning and passivation process of a utility boiler provided by the invention.
Detailed Description
To make the features and effects of the present invention comprehensible to those skilled in the art, general description and definitions are made below with reference to terms and expressions mentioned in the specification and claims. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The theory or mechanism described and disclosed herein, whether correct or incorrect, should not limit the scope of the present invention in any way, i.e., the present disclosure may be practiced without being limited by any particular theory or mechanism.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
In order to realize automatic control of the passivation process, the chemical adding efficiency is high, the labor intensity of personnel is reduced, the pH control precision is high, and the passivation effect is stable. The invention provides an automatic dosing system for a chemical cleaning and passivating process of a power station boiler, which comprises a cleaning box 1, a cleaning pump 2, an ammonia adding device 3, a sampling and cooling device 4, an online pH monitoring device 5, a dosing control device 6, a passivating agent adding device 7 and a chemical cleaning system flow meter 8, wherein the dosing control device 6 automatically controls the starting and the stopping of the ammonia adding device 3 and the passivating agent adding device 7 according to the requirements of the passivating process.
The ammoniation device 3 and the passivator adding device 7 are both electrically connected with the output end of the dosing control device 6, and the online pH monitoring device 5 is electrically connected with the input end of the dosing control device 6. The chemical cleaning system flowmeter 8 is electrically connected with the input end of the dosing control device 6.
Add ammonia device 3 include concentrated ammonia water tank, frequency conversion measurement and add the ammonia pump, add ammonia device 3 and be connected to the entry of wasing case 1 or scavenging pump 2, the frequency conversion measurement adds opening of ammonia pump and stops signal and frequency signal and far reach and add medicine controlling means 6. The variable-frequency metering ammonia adding pump is electrically connected with the drug adding control device 6.
The inlet of the sampling cooling device 4 is connected with the outlet pipeline of the cleaning pump 2, the outlet of the sampling cooling device 4 is connected with the inlet of the online pH monitoring device 5, and the outlet of the online pH monitoring device 5 is connected with the cleaning box 1.
And the pH signal of the online pH monitoring device 5 is remotely transmitted to the dosing control device 6.
The passivating agent adding device 7 comprises a passivating agent dissolving tank, a variable-frequency metering dosing pump and a flowmeter, and the start-stop signal and the frequency signal of the variable-frequency metering dosing pump and the flow signal of the flowmeter are remotely transmitted to the dosing control device 6. The variable-frequency metering dosing pump is electrically connected with the dosing control device 6.
Chemical cleaning system flowmeter 8 connect the cleaning system main line at the cleaning pump export, chemical cleaning system flowmeter 8's flow signal passes far to medicine controlling means 6.
The drug adding control device 6 comprises a drug adding control PLC and a PLC display screen, and the drug adding control PLC is electrically connected with the PLC display screen. The PLC display screen is a touch display screen and can display the pH value of the cleaning system, the flow of the cleaning system, the running state of the variable-frequency metering ammonia feeding pump and the running state of the variable-frequency metering chemical feeding pump.
The control of the system pH is PID control, the target pH is set on a control panel, the relative size of the pH and the target pH is displayed by an online pH monitoring device, and the operation of the variable-frequency metering ammonia adding pump is controlled by a PLC.
The adding amount of the system passivator is controlled by the total amount, the adding volume of the passivator is set on a touch display screen of a PLC display screen, and the passivator dosing device stops running when the cumulative dosing volume of a flowmeter in the passivator dosing device 7 in the current dosing is equal to the set adding volume; a proportional factor K of the adding speed of the passivating agent can be set on a PLC display screen which is a touch display screen, the PLC controls the frequency of the variable-frequency metering dosing pump according to the proportional factor K, and the control strategy is that the proportional factor K is equal to the flow display value of a passivating agent adding device 7 divided by the flow display value of a chemical cleaning system flow meter.
The dosing system has the functions of automatic monitoring of passivation pH value, automatic adjustment of the pH value required by passivation and automatic addition of a passivating agent; after being led out, the solution in the cleaning tank of the chemical cleaning system is cooled by a sampling cooler and then is monitored by an online pH meter, a pH signal is transmitted to a PLC, and the PLC controls the frequency of an ammonia dosing pump and adjusts and controls the pH required by passivation; the PLC controls a passivator dosing pump to automatically add the passivator into the system, and the passivator dosing pump is stopped after the passivator is added into the cleaning system. The method realizes automatic control of the passivation process, has high dosing efficiency, reduces the labor intensity of personnel, has high pH control precision, is easy to realize and has stable passivation effect. The invention is suitable for the passivation dosing process in the chemical cleaning of boilers of various types.
The utility model provides a power plant boiler chemical cleaning passivation technology automatic reagent feeding system, its operation strategy has two kinds of modes:
can select on the PLC display screen, operation mode A:
starting the ammonia adding device 3 to adjust the pH value of the cleaning system to a set value, then starting the passivator adding device 7, and stopping the operation of the chemical adding system after the pH value is adjusted and the passivator is added;
operation mode B:
and simultaneously starting the ammonia adding device 3 and the passivator adding device 7 firstly, adjusting the pH value of the system in the passivator adding process, and stopping the operation of the chemical adding system after the pH value is adjusted and the passivator is added.
The invention is suitable for adding medicaments in passivation processes such as a hydrogen peroxide passivation process, an EDTA passivation process, an acetone oxime passivation process, an acetaldoxime passivation process, a hydrazine passivation process, a sodium nitrite passivation process and the like.
The following examples use instrumentation conventional in the art. The experimental procedures, in which specific conditions are not noted in the following examples, are generally carried out under conventional conditions or conditions recommended by the manufacturers. The various starting materials used in the examples which follow, unless otherwise indicated, are conventional commercial products having specifications which are conventional in the art.
Example 1:
a certain 600WM supercritical unit is cleaned by using a composite organic acid and adopts a passivation process of ammonia water and hydrogen peroxide. The cleaning system comprises a cleaning box, a cleaning pump, an ammonia adding device, a sampling cooling device, an online pH monitoring device, a dosing control device, a passivator adding device, a chemical cleaning system flow meter and a dosing control device. The outlet of the ammoniation device is connected with the cleaning box; the dosing control device is connected with the cleaning box; the outlet of the cleaning pump is connected with the inlet of the sampling cooling device; the outlet of the sampling cooling device is connected to the inlet of the online pH monitoring device, and the outlet of the online pH monitoring device is connected to the cleaning box; the outlet of the cleaning pump is connected with a flowmeter, and the outlet of the variable-frequency metering dosing pump of the passivating agent device is connected with a metering pump; the signals of the ammoniating device, the passivator adding device, the outlet flowmeter of the cleaning pump and the online pH monitoring device are remotely transmitted to the dosing control device, and the dosing control device automatically controls the start and stop of the ammoniating device and the passivator adding device.
Selecting an operation mode A in a PLC touch display screen; the target pH of the cleaning system is set to 9.80, and the volume of the added 30% hydrogen peroxide is set to 4.1m 3 The scale factor is set to 0.016. Starting a dosing system, adjusting the pH to 9.82 finally, and controlling the system circulation flow to 400m 3 /h～500m 3 H, the medicine adding flow of the passivating agent is 6.4m 3 /h～8m 3 And h, after the passivator is added, the dosing system automatically stops, the passivation dosing process is completed, the passivation solution is discharged after the passivation is carried out for a certain time, and finally the passivation effect is good.
Example 2:
EDTA is used as a cleaning medium in a 660MW supercritical boiler, and the concentration of free EDTA at the later stage of cleaning is 0.8%. The cleaning system comprises a cleaning box, a cleaning pump, an ammonia adding device, a sampling cooling device, an online pH monitoring device, a dosing control device, a chemical cleaning system flowmeter and a dosing control device. The outlet of the ammonia adding device is connected with the cleaning box; the outlet of the cleaning pump is connected with the inlet of the sampling cooling device; the outlet of the sampling cooling device is connected to the inlet of the online pH monitoring device, and the outlet of the online pH monitoring device is connected to the cleaning box; the outlet of the cleaning pump is connected with a flowmeter; signals of the ammonia adding device, the outlet flow meter of the cleaning pump and the online pH monitoring device are remotely transmitted to the chemical adding control device, and the chemical adding control device automatically controls the ammonia adding device to start and stop.
Selecting an operation mode B in the PLC touch display screen; the target pH of the cleaning system was set to 9.10 and the volume of passivating agent added was set to 0m 3 The scale factor is set to 0. Starting the medicine adding system, and finally adjusting the pH value to be9.14, the dosing system automatically stops after the pH value of the system is qualified, the passivation dosing process is completed, the passivation solution is discharged after the passivation is carried out for a certain time, and the final passivation effect is good.
Example 3:
certain 1000MW supercritical boiler uses citric acid as pickling medium and adopts acetone oxime passivation.
The cleaning system comprises a cleaning box, a cleaning pump, an ammonia adding device, a sampling cooling device, an online pH monitoring device, a dosing control device, a passivator adding device, a chemical cleaning system flow meter and a dosing control device. The outlet of the ammonia adding device is connected with the cleaning box; the dosing control device is connected with the cleaning box; the outlet of the cleaning pump is connected with the inlet of the sampling cooling device; the outlet of the sampling cooling device is connected to the inlet of the online pH monitoring device, and the outlet of the online pH monitoring device is connected to the cleaning box; the outlet of the cleaning pump is connected with a flowmeter, and the outlet of the variable-frequency metering dosing pump of the passivating agent device is connected with a metering pump; the signals of the ammoniating device, the passivator adding device, the outlet flowmeter of the cleaning pump and the online pH monitoring device are remotely transmitted to the dosing control device, and the dosing control device automatically controls the start and stop of the ammoniating device and the passivator adding device.
Selecting an operation mode B in the PLC touch display screen; the target pH of the cleaning system was set to 10.55 and the volume of the added 20% acetoxime was set to 1.4m 3 The scale factor is set to 0.004. Starting a dosing system, adjusting the pH to be 10.57 finally, and controlling the system circulation flow to be 750m 3 /h～800m 3 H, the medicine adding flow of the passivator is 3m 3 /h～3.2m 3 And h, after the passivator is added, the dosing system automatically stops, the passivation dosing process is completed, the passivation solution is discharged after the passivation is carried out for a certain time, and finally the passivation effect is good.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. An automatic dosing system for a chemical cleaning and passivation process of a power station boiler is characterized by comprising a cleaning box (1), a cleaning pump (2), an ammonia adding device (3), a sampling and cooling device (4), an online pH monitoring device (5), a dosing control device (6) and a passivator adding device (7);
an outlet of the cleaning box (1) is sequentially connected with a cleaning pump (2) and a chemical cleaning system, and an outlet of the chemical cleaning system is connected with an inlet of the cleaning box (1); the inlet of the sampling cooling device (4) is connected with the outlet of the cleaning pump (2); the outlets of the ammoniation device (3) and the passivator adding device (7) are connected with the cleaning box (1);
the online pH monitoring device (5) is arranged on the outlet of the sampling cooling device (4);
the ammoniation device (3) and the passivator adding device (7) are electrically connected with the output end of the dosing control device (6), and the online pH monitoring device (5) is electrically connected with the input end of the dosing control device (6).
2. The automatic chemical dosing system for the chemical cleaning and passivation process of the utility boiler as claimed in claim 1, wherein the ammonia adding device (3) comprises a concentrated ammonia water tank and a variable frequency metering ammonia adding pump, the ammonia adding device (3) is connected to an inlet of the cleaning tank (1) or the cleaning pump (2), and the variable frequency metering ammonia adding pump is electrically connected with the chemical dosing control device (6).
3. The automatic chemical feeding system for the chemical cleaning and passivation process of the utility boiler as claimed in claim 1, wherein the passivating agent feeding device (7) comprises a passivating agent dissolving tank, a variable frequency metering feeding pump and a flow meter, and the variable frequency metering feeding pump is electrically connected with the chemical feeding control device (6).
4. The automatic chemical feeding system for the chemical cleaning and passivation process of the power station boiler as claimed in claim 1, characterized in that the outlet of the online pH monitoring device (5) is connected to the cleaning tank (1).
5. The automatic chemical dosing system for the chemical cleaning and passivation process of the utility boiler as claimed in claim 1, further comprising a chemical cleaning system flow meter (8), wherein the chemical cleaning system flow meter (8) is connected to a cleaning system main pipeline of an outlet of the cleaning pump, and the chemical cleaning system flow meter (8) is electrically connected to an input end of the chemical dosing control device (6).
6. The automatic chemical dosing system for the chemical cleaning and passivation process of the utility boiler as claimed in claim 1, wherein the chemical dosing control device (6) comprises a chemical dosing control PLC and a PLC display screen, and the chemical dosing control PLC is electrically connected with the PLC display screen.
7. The control method of the automatic chemical feeding system for the chemical cleaning and passivating process of the power station boiler as claimed in any one of claims 1 to 6, characterized by comprising two operation modes:
the operation mode A is as follows:
starting the ammoniation device (3) to adjust the pH value of the cleaning system to a set value, then starting the passivator adding device (7), and stopping the operation of the dosing system after the pH value is adjusted and the passivator is added;
operation mode B:
and simultaneously starting the ammonia adding device (3) and the passivator adding device (7) to adjust the pH value of the system in the passivator adding process, and stopping the operation of the chemical adding system after the pH value is adjusted and the passivator is added.
8. The control method according to claim 7, characterized in that the passivating agent adding device (7) controls the frequency of the variable-frequency metering dosing pump according to a proportionality factor K, wherein the control strategy is that the example factor K is equal to a flow display value of the passivating agent adding device (7) divided by a flow meter display value of the chemical cleaning system, and the passivating agent adding device is stopped when the cumulative dosing volume of the flow meter in the passivating agent adding device (7) in the current dosing is equal to the set dosing volume.
9. The control method according to claim 7, characterized in that a hydrogen peroxide passivation process, an EDTA passivation process, an acetone oxime passivation process, an acetaldoxime passivation process, a hydrazine passivation process or a sodium nitrite passivation process is adopted in the passivator adding device (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210924449.1A CN115161629B (en) | 2022-08-01 | 2022-08-01 | Automatic dosing system and method for chemical cleaning and passivating process of power station boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210924449.1A CN115161629B (en) | 2022-08-01 | 2022-08-01 | Automatic dosing system and method for chemical cleaning and passivating process of power station boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115161629A true CN115161629A (en) | 2022-10-11 |
| CN115161629B CN115161629B (en) | 2024-04-02 |
Family
ID=83477501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210924449.1A Active CN115161629B (en) | 2022-08-01 | 2022-08-01 | Automatic dosing system and method for chemical cleaning and passivating process of power station boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115161629B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101250698A (en) * | 2008-03-27 | 2008-08-27 | 江阴市江东不锈钢制造有限公司 | Method for manufacturing or repairing cylinder cover by composite corpuscle nickel base alloy |
| CN102418104A (en) * | 2011-12-13 | 2012-04-18 | 长沙市中蓝清洗技术有限公司 | Chemical for cleaning boiler, using method and cleaning device thereof |
| CN103266316A (en) * | 2013-05-09 | 2013-08-28 | 东风汽车紧固件有限公司 | Phosphating solution online-monitoring and automatic-supplementing apparatus |
| CN203754807U (en) * | 2014-03-03 | 2014-08-06 | 青海瑞合铝箔有限公司 | Formed foil production line bath solution circulating system |
| CN107059030A (en) * | 2017-05-02 | 2017-08-18 | 西安热工研究院有限公司 | A kind of power station superheater or reheater oxide skin chemical cleaning system and method |
| CN108342767A (en) * | 2018-02-28 | 2018-07-31 | 首钢京唐钢铁联合有限责任公司 | A kind of electrotinning producing line chromic acid automatic liquid-feeding system |
| US20180245233A1 (en) * | 2017-02-27 | 2018-08-30 | South China Institute Of Environmental Sciences. Mep | Intelligent water control equipment for intermittently countercurrent rinsing plating articles and automatic water control method thereof |
| CN110777373A (en) * | 2019-10-29 | 2020-02-11 | 河北冀研能源科学技术研究院有限公司 | Sodium hydroxide treatment device and method for high-pressure-increasing drainage system of power plant |
| CN112125359A (en) * | 2020-09-23 | 2020-12-25 | 江苏永钢集团有限公司 | Automatic dosing control system and control method suitable for electric furnace water system |
| CN114229959A (en) * | 2021-12-17 | 2022-03-25 | 湖南军信环保股份有限公司 | Movable automatic dosing device and control method thereof |
| CN114632424A (en) * | 2022-04-28 | 2022-06-17 | 华能威海发电有限责任公司 | Acid-base comprehensive compensation system and method for chemical cleaning of reverse osmosis membrane |
-
2022
- 2022-08-01 CN CN202210924449.1A patent/CN115161629B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101250698A (en) * | 2008-03-27 | 2008-08-27 | 江阴市江东不锈钢制造有限公司 | Method for manufacturing or repairing cylinder cover by composite corpuscle nickel base alloy |
| CN102418104A (en) * | 2011-12-13 | 2012-04-18 | 长沙市中蓝清洗技术有限公司 | Chemical for cleaning boiler, using method and cleaning device thereof |
| CN103266316A (en) * | 2013-05-09 | 2013-08-28 | 东风汽车紧固件有限公司 | Phosphating solution online-monitoring and automatic-supplementing apparatus |
| CN203754807U (en) * | 2014-03-03 | 2014-08-06 | 青海瑞合铝箔有限公司 | Formed foil production line bath solution circulating system |
| US20180245233A1 (en) * | 2017-02-27 | 2018-08-30 | South China Institute Of Environmental Sciences. Mep | Intelligent water control equipment for intermittently countercurrent rinsing plating articles and automatic water control method thereof |
| CN107059030A (en) * | 2017-05-02 | 2017-08-18 | 西安热工研究院有限公司 | A kind of power station superheater or reheater oxide skin chemical cleaning system and method |
| CN108342767A (en) * | 2018-02-28 | 2018-07-31 | 首钢京唐钢铁联合有限责任公司 | A kind of electrotinning producing line chromic acid automatic liquid-feeding system |
| CN110777373A (en) * | 2019-10-29 | 2020-02-11 | 河北冀研能源科学技术研究院有限公司 | Sodium hydroxide treatment device and method for high-pressure-increasing drainage system of power plant |
| CN112125359A (en) * | 2020-09-23 | 2020-12-25 | 江苏永钢集团有限公司 | Automatic dosing control system and control method suitable for electric furnace water system |
| CN114229959A (en) * | 2021-12-17 | 2022-03-25 | 湖南军信环保股份有限公司 | Movable automatic dosing device and control method thereof |
| CN114632424A (en) * | 2022-04-28 | 2022-06-17 | 华能威海发电有限责任公司 | Acid-base comprehensive compensation system and method for chemical cleaning of reverse osmosis membrane |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115161629B (en) | 2024-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101254953A (en) | Circulating cooling water purification re-utilization automatic monitoring system | |
| CN103266316A (en) | Phosphating solution online-monitoring and automatic-supplementing apparatus | |
| CN201190120Y (en) | Automatic monitoring apparatus for purification and re-use of recirculated cooling water | |
| CN115161629A (en) | Automatic dosing system and method for chemical cleaning and passivation process of power station boiler | |
| CN210765526U (en) | Automatic control system of stainless steel strip pickling device | |
| CN107767982A (en) | A kind of online washer of nuclear power facility primary Ioops radioactive pollution and method | |
| CN209922985U (en) | Circulating water corrosion control system of indirect air cooling unit of thermal power factory | |
| CN112147315A (en) | Nuclear power plant ion exchange resin purification simulation test device and test method | |
| CN218435151U (en) | Fluorescent tracing method medicine adding device | |
| CN115078670B (en) | Water vapor simulation test device and method for power plant | |
| CN207441272U (en) | A kind of online washer of nuclear power facility primary Ioops radioactive pollution | |
| CN210450145U (en) | A equipment that is used for online alkali washing of PPH pipeline to degrease | |
| CN1126232C (en) | Inner-cooling water ammonization fuzzy regulation and control method and its monitoring and control system | |
| CN206772953U (en) | A kind of Industrial Boiler water hardness monitoring device | |
| CN2910899Y (en) | Management and control device for circulation water | |
| CN207862064U (en) | Recirculated water automatic control system | |
| CN211338989U (en) | Absorption heat pump waste heat water automatic reagent feeding water conservation processing system | |
| CN111477367A (en) | Be applied to intelligent calibration device that nuclear power plant boron concentration monitoring was said | |
| CN112226779A (en) | Chemical cleaning system and method for two loops of high-temperature gas cooled reactor nuclear power unit | |
| CN203411330U (en) | Neutralizing device of acid-contained ethanol solution in lithium iron phosphate production process | |
| CN112268484A (en) | Cooler online cleaning device | |
| CN111359467A (en) | Preparation system and preparation method of ion exchange resin resuscitation solution | |
| CN112344314A (en) | Sodium-cooled fast reactor steam generator and chemical cleaning system for steam-water side of heat transfer pipe of superheater | |
| CN208362410U (en) | A kind of automobile axle shaft quenching liquid thermostatically-controlled equipment | |
| CN215570393U (en) | Boiler chemical cleaning system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |