CN115161629B - Automatic dosing system and method for chemical cleaning and passivating process of power station boiler - Google Patents
Automatic dosing system and method for chemical cleaning and passivating process of power station boiler Download PDFInfo
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- CN115161629B CN115161629B CN202210924449.1A CN202210924449A CN115161629B CN 115161629 B CN115161629 B CN 115161629B CN 202210924449 A CN202210924449 A CN 202210924449A CN 115161629 B CN115161629 B CN 115161629B
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- 238000004140 cleaning Methods 0.000 title claims abstract description 122
- 238000000034 method Methods 0.000 title claims abstract description 67
- 230000008569 process Effects 0.000 title claims abstract description 54
- 239000000126 substance Substances 0.000 title claims abstract description 50
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 94
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 72
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 47
- 238000002161 passivation Methods 0.000 claims abstract description 40
- 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
- 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
- 238000011217 control strategy Methods 0.000 claims description 4
- FZENGILVLUJGJX-IHWYPQMZSA-N (Z)-acetaldehyde oxime Chemical compound C\C=N/O FZENGILVLUJGJX-IHWYPQMZSA-N 0.000 claims description 3
- 235000010288 sodium nitrite Nutrition 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 8
- 239000003814 drug Substances 0.000 abstract description 6
- 229940079593 drug Drugs 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- -1 compound organic acid Chemical class 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method 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
- 230000000737 periodic effect Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
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 passivating 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; the outlet of the cleaning box is sequentially connected with a cleaning pump and a chemical cleaning system, and the outlet of the chemical cleaning system is connected with the inlet of the cleaning box; the inlet of the sampling cooling device is connected with the cleaning pump outlet; 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 an 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 dosing control device, and the online pH monitoring device is electrically connected with the input end of the dosing control device. The method realizes automatic control of the passivation process, has high drug addition 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 passivating process of a power station boiler.
Background
The chemical cleaning is an effective method for removing scale, oxide skin and corrosion products on the inner surface of the heat exchange tube of the power station boiler, the chemical cleaning can obviously improve the heat exchange efficiency of the boiler, and the economical, safe and effective operation of the boiler is ensured. The chemical cleaning of the power station boiler comprises the technical processes of acid washing, water flushing after acid washing, rinsing, passivation and the like. After the inner surface of the metal of the heating surface of the power station boiler is pickled, scaling substances, oxide scales and corrosion products on the surface of the metal are dissolved by a cleaning agent, the active surface of the metal is exposed, and the passivation process is to use chemical agents to reform a layer of protective film on the surface of the metal so as to prevent the surface of the metal 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 during the starting of a unit is shortened, and water and fuel consumption during the starting is saved, so that passivation is an important step for guaranteeing cleaning quality.
The chemical cleaning, passivating and dosing process of the power station boiler is usually controlled manually, the pH is required to be tested by periodic sampling, and the dosing control accuracy is low. Because of lack of automatic control, the labor intensity of personnel is high, the personnel cost 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 passivating process of a power station boiler. The invention is suitable for chemical cleaning of various boilers and various passivation processes.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
an automatic dosing system for a chemical cleaning and passivating process of a power station boiler 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;
the outlet of the cleaning box is sequentially connected with a cleaning pump and a chemical cleaning system, and the outlet of the chemical cleaning system is connected with the inlet of the cleaning box; the inlet of the sampling cooling device is connected with the cleaning pump outlet; 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 an 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 dosing control device, and the online pH monitoring device is electrically connected with the input end of the dosing 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 the inlet of the cleaning tank or the cleaning pump, and the variable frequency metering ammonia adding pump is electrically connected with the dosing control device.
As a further improvement of the invention, the passivating agent adding device comprises a passivating agent dissolving tank, a variable frequency metering dosing pump and a flowmeter, and the variable frequency metering dosing pump is electrically connected with a dosing control device.
As a further improvement of the invention, the outlet of the online pH monitoring device is connected to a purge bin.
As a further improvement of the invention, the chemical cleaning system comprises a chemical cleaning system flowmeter which is connected to a cleaning system main pipeline at the outlet of the cleaning pump and is electrically connected with the input end of the chemical feeding control device.
As a further improvement of the invention, the medicine adding control device comprises a medicine adding control PLC and a PLC display screen, and the medicine adding control PLC is electrically connected with the PLC display screen.
A control method of an automatic dosing system for a chemical cleaning and passivating process of a power station boiler comprises two operation modes:
operation mode A:
firstly, starting an ammonia adding device to adjust the pH value of a cleaning system to a set value, then starting a passivating agent adding device, and stopping the operation of the dosing system after the pH value is adjusted and the passivating agent is added;
operation mode B:
simultaneously, the ammonia adding device and the passivating agent adding device are started firstly, the pH value of the system is adjusted in the passivating agent adding process, the pH value adjustment is completed, and the dosing system stops running after the passivating agent is added.
As a further improvement of the invention, the passivating agent adding device controls the frequency of the variable-frequency metering dosing pump according to the scale factor K, wherein the control strategy is that the scale factor K is equal to the flow display value of the passivating agent adding device divided by the flow display value of the flow meter of the chemical cleaning system, and the passivating agent adding device is taken out of operation when the accumulated dosing volume of the flow meter in the passivating agent adding device in the current dosing is equal to the set adding volume.
As a further improvement of the invention, the passivating agent adding device adopts a hydrogen peroxide passivation process, an EDTA passivation process, an acetone oxime passivation process, an acetaldehyde oxime passivation process, a hydrazine passivation process or a sodium nitrite passivation process.
Compared with the prior art, the invention has the following advantages:
the automatic dosing system for the chemical cleaning and passivating process of the power station boiler is easy to realize, the passivating process is automatically controlled, the pH information can be obtained in real time by the on-line pH monitoring device through the adding amount control of the ammonia adding device and the passivating agent adding device, the automatic control of the passivating process is realized, the dosing efficiency is high, the labor intensity of personnel is reduced, the pH control precision is high, and the passivating effect is stable. The invention is suitable for chemical cleaning of various boilers and various passivation processes.
Drawings
FIG. 1 is a schematic diagram of an automatic dosing system for a chemical cleaning and passivating process of a power station boiler.
Detailed Description
So that those skilled in the art can appreciate the features and effects of the present invention, a general description and definition of the terms and expressions set forth in the specification and claims follows. Unless otherwise defined, 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, and in the event of a conflict, the present specification shall control.
The theory or mechanism described and disclosed herein, whether right or wrong, is not meant to limit the scope of the invention in any way, i.e., the present disclosure may be practiced without limitation to any particular theory or mechanism.
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
In order to realize automatic control of the passivation process, the method has the advantages of high drug adding efficiency, reduced labor intensity, high pH control precision and stable passivation effect. 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 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 flowmeter 8, wherein the dosing control device 6 automatically controls the starting and stopping of the ammonia adding device 3 and the passivating agent adding device 7 according to the requirement of the passivating process.
The ammonia adding device 3 and the passivating agent 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. The flowmeter 8 of the chemical cleaning system is electrically connected with the input end of the chemical feeding control device 6.
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 the inlet of the cleaning tank 1 or the cleaning pump 2, and a start-stop signal and a frequency signal of the variable frequency metering ammonia adding pump are remotely transmitted to the dosing control device 6. The variable-frequency metering ammonia adding pump is electrically connected with the dosing 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.
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 a start-stop signal, a frequency signal and a flow signal of the flowmeter of the variable frequency metering dosing pump are remotely transmitted to the dosing control device 6. The variable-frequency metering dosing pump is electrically connected with a dosing control device 6.
The chemical cleaning system flowmeter 8 is connected to a cleaning system main pipeline at the outlet of the cleaning pump, and a flow signal of the chemical cleaning system flowmeter 8 is remotely transmitted to the dosing control device 6.
The dosing control device 6 comprises a dosing control PLC and a PLC display screen, and the dosing control PLC is electrically connected with the PLC display screen. The PLC display screen is a touch display screen, and can display the pH of the cleaning system, the flow of the cleaning system, the running state of the variable-frequency metering ammonia adding pump and the running state of the variable-frequency metering dosing pump.
The control of the system pH is PID control, the target pH is set on a control panel, the relative sizes of the pH and the target pH are displayed according to an online pH monitoring device, and the operation of the variable-frequency metering ammonia pump is controlled by a PLC.
The adding amount of the passivating agent of the system is controlled as the total amount, the adding volume of the passivating agent is set on a touch display screen of a PLC display screen, and when the accumulated adding volume of a flowmeter in the device 7 for adding the passivating agent in the adding process is equal to the set adding volume, the passivating agent adding device is taken out of operation; the PLC can set a scale factor K of the passivating agent adding speed on the touch display screen, and control the frequency of the variable-frequency metering dosing pump according to the scale factor K, wherein the control strategy is that the scale factor K is equal to the flow display value of the passivating agent adding device 7 divided by the flow display value of the chemical cleaning system flowmeter.
The dosing system has the functions of automatically monitoring the passivation pH value, automatically adjusting the pH value required by passivation and automatically adding a passivating agent; after the solution in the cleaning box of the chemical cleaning system is led out and cooled by a sampling cooler, the solution 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; and (3) controlling a passivating agent dosing pump by a PLC to automatically add the passivating agent into the system, and stopping the passivating agent dosing pump after the passivating agent is added into the cleaning system. The method realizes automatic control of the passivation process, has high drug addition 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 passivation and dosing processes during chemical cleaning of various boilers.
An automatic dosing system for a chemical cleaning and passivating process of a power station boiler has two operation strategies:
the operation mode A can be selected on a PLC display screen:
firstly, starting an ammonia adding device 3 to adjust the pH value of a cleaning system to a set value, then starting a passivating agent adding device 7, and stopping the operation of the dosing system after the pH value is adjusted and the passivating agent is added;
operation mode B:
simultaneously, the ammonia adding device 3 and the passivating agent adding device 7 are started firstly, the pH value of the system is adjusted in the passivating agent adding process, the pH value adjustment is completed, and the dosing system stops running after the passivating agent is added.
The invention is suitable for dosing in passivation processes such as hydrogen peroxide passivation process, EDTA passivation process, acetone oxime passivation process, acetaldehyde oxime passivation process, hydrazine passivation process, sodium nitrite passivation process and the like.
The following examples use instrumentation conventional in the art. The experimental methods, in which specific conditions are not noted in the following examples, are generally conducted under conventional conditions or under conditions recommended by the manufacturer. The following examples used various starting materials, unless otherwise indicated, were conventional commercial products, the specifications of which are conventional in the art.
Example 1:
a 600WM supercritical unit is cleaned by using a compound organic acid, and a passivation process of ammonia water and hydrogen peroxide is adopted. 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 passivating agent adding 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 dosing control device is connected with the cleaning box; the cleaning pump outlet 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 cleaning pump outlet is connected with the flowmeter, and the variable-frequency metering dosing pump outlet of the passivating agent device is connected with the metering pump; the signals of the ammonia adding device, the passivating agent adding device, the cleaning pump outlet flowmeter and the online pH monitoring device are remotely transmitted to the dosing control device, and the starting and stopping of the ammonia adding device and the passivating agent adding device are automatically controlled by the dosing control 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 the dosing system, and adjusting the pH to be finally9.82, a system circulation flow of 400m 3 /h～500m 3 And/h, the dosing flow of the passivating agent is 6.4m 3 /h～8m 3 And (h) automatically stopping the dosing system after the passivating agent is added, completing the passivating dosing process, discharging the passivating liquid after passivating for a certain time, and finally achieving a good passivating effect.
Example 2:
EDTA was used as the cleaning medium for some 660MW supercritical boiler, and the concentration of free EDTA at the later stage of cleaning was 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 cleaning pump outlet 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 cleaning pump outlet is connected with the flowmeter; the signals of the ammonia adding device, the cleaning pump outlet flowmeter and the online pH monitoring device are remotely transmitted to the dosing control device, and the dosing 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. And the dosing system is started, the pH value regulated is 9.14 finally, the dosing system is automatically stopped after the pH value of the system is qualified, the passivation dosing process is finished, passivation liquid is discharged after passivation is carried out for a certain time, and the final passivation effect is good.
Example 3:
some 1000MW supercritical boiler uses citric acid as pickling medium and is passivated with acetone oxime.
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 passivating agent adding 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 dosing control device is connected with the cleaning box; the cleaning pump outlet 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 cleaning pump outlet is connected with the flowmeter, and the variable-frequency metering dosing pump outlet of the passivating agent device is connected with the metering pump; the signals of the ammonia adding device, the passivating agent adding device, the cleaning pump outlet flowmeter and the online pH monitoring device are remotely transmitted to the dosing control device, and the starting and stopping of the ammonia adding device and the passivating agent adding device are automatically controlled by the dosing control device.
Selecting an operation mode B in the PLC touch display screen; the target pH of the washing system was set to 10.55, and the volume of 20% acetoxime added was set to 1.4m 3 The scale factor is set to 0.004. Starting the dosing system, adjusting pH to 10.57, and circulating flow of 750m 3 /h～800m 3 And/h, the dosing flow of the passivating agent is 3m 3 /h～3.2m 3 And (h) automatically stopping the dosing system after the passivating agent is added, completing the passivating dosing process, discharging the passivating liquid after passivating for a certain time, and finally achieving a good passivating effect.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present invention.
Claims (6)
1. The automatic dosing system for the chemical cleaning and passivating process of the power station boiler is characterized by comprising a cleaning box (1), a cleaning pump (2), an ammonia adding device (3), a sampling cooling device (4), an online pH monitoring device (5), a dosing control device (6) and a passivating agent adding device (7);
the outlet of the cleaning box (1) is sequentially connected with a cleaning pump (2) and a chemical cleaning system, and the outlet of the chemical cleaning system is connected with the 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 ammonia adding device (3) and the passivating agent 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 ammonia adding device (3) and the passivating agent 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);
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 the inlet of the cleaning tank (1) or the cleaning pump (2), and the variable-frequency metering ammonia adding pump is electrically connected with 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 variable frequency metering dosing pump is electrically connected with the dosing control device (6);
the chemical cleaning system flowmeter (8) is connected to a cleaning system main pipeline at the outlet of the cleaning pump, and the chemical cleaning system flowmeter (8) is electrically connected with the input end of the chemical feeding control device (6);
the passivating agent adding device (7) controls the frequency of the variable-frequency metering dosing pump according to the scale factor K, wherein the control strategy is that the scale factor K is equal to the flow display value of the passivating agent adding device (7) divided by the flow display value of the chemical cleaning system, and when the accumulated dosing volume of the flow meter in the passivating agent adding device (7) in the dosing is equal to the set adding volume, the passivating agent adding device is out of operation.
2. The automatic dosing system for a chemical cleaning and passivating process of a power station boiler according to claim 1, wherein an outlet of the online pH monitoring device (5) is connected to the cleaning tank (1).
3. The automatic dosing system for the chemical cleaning and passivating process of the power station boiler according to claim 1, wherein the dosing control device (6) comprises a dosing control PLC and a PLC display screen, and the dosing control PLC is electrically connected with the PLC display screen.
4. A method for controlling an automatic dosing system for a chemical cleaning and passivating process of a utility boiler according to any one of claims 1 to 3, characterized by two modes of operation:
operation mode A:
firstly, starting an ammonia adding device (3) to adjust the pH value of a cleaning system to a set value, then starting a passivating agent adding device (7), and stopping the operation of the dosing system after the pH value is adjusted and the passivating agent is added;
operation mode B:
simultaneously, the ammonia adding device (3) and the passivating agent adding device (7) are started firstly, the pH value of the system is adjusted in the passivating agent adding process, the pH value is adjusted, and the dosing system stops running after the passivating agent is added.
5. The control method according to claim 4, wherein the passivating agent adding device (7) controls the frequency of the variable frequency metering dosing pump according to a scale factor K, wherein the control strategy is that the scale factor K is equal to the flow display value of the passivating agent adding device (7) divided by the flow display value of the chemical cleaning system, and the passivating agent adding device is out of operation when the accumulated dosing volume of the flow meter in the passivating agent adding device (7) in the current dosing is equal to the set adding volume.
6. The control method according to claim 4, wherein the passivating agent adding device (7) adopts a hydrogen peroxide passivation process, an EDTA passivation process, an acetoxime passivation process, an acetaldehyde oxime passivation process, a hydrazine passivation process or a sodium nitrite passivation process.
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| 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 |
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| 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 |
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