CN210801139U - Hydrophobic corrosion protection system - Google Patents
Hydrophobic corrosion protection system Download PDFInfo
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- CN210801139U CN210801139U CN201921692319.XU CN201921692319U CN210801139U CN 210801139 U CN210801139 U CN 210801139U CN 201921692319 U CN201921692319 U CN 201921692319U CN 210801139 U CN210801139 U CN 210801139U
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Abstract
The utility model provides a hydrophobic corrosion protection system, which comprises a condenser, a multi-stage low-pressure heater assembly, a deaerator and a multi-stage high-pressure heater assembly which are connected in sequence; the low-pressure drain pipelines of the multistage low-pressure heater assemblies flow back to the condenser step by step, and the high-pressure drain pipelines of the multistage high-pressure heater assemblies flow back to the deaerator step by step; the hydrophobic corrosion protection system also comprises a control device, a dosing tank and a pump unit connected with the dosing tank, wherein the pump unit comprises a first control pipeline and a second control pipeline, the first control pipeline is connected with the low-pressure hydrophobic pipeline, and the second control pipeline is connected with the high-pressure hydrophobic pipeline; the first control pipeline and the second control pipeline are respectively in signal connection with the control device. The utility model discloses a hydrophobic corrosion protection system aims at solving the serious technical problem of current hydrophobic system mother metal corruption.
Description
Technical Field
The application relates to the field of generator hydrophobic corrosion protection systems, in particular to a hydrophobic corrosion protection system.
Background
The steam side of a drainage system of a power plant has a turbulent flow region, steam and liquid flow due to low grade of metal materials, and the distribution coefficients of ammonia are different between the steam phase and the liquid phase, so that the special operating conditions of low pH value of the liquid phase and the like are caused, the steam side becomes a high-occurrence region where Flow Accelerated Corrosion (FAC) occurs, the base metal is rapidly abraded and corroded, even leaked, and the steam side is a corrosion form which causes great harm to the safety and the economy of a unit. Due to the fact that the high-flow-rate working medium accelerates the removal and migration of the corrosion layer, the hydrophobic throttle is blocked and split, and iron corrosion products migrate to the heating surface of the high-load area. Therefore, FAC occurring on the vapor side of the hydrophobic system is an important factor causing fretting corrosion and high deposition rate of the metal base material.
The feed water oxygenation treatment technology is proved by theory and practice that a safety oxygenation mode that dissolved oxygen is not additionally added at the steam side is accepted and widely applied in the industry, a thermodynamic system is basically protected, but the steam side of a drainage system becomes a protected 'blind area'. Because the pressure of the high-pressure heater on the hydrophobic steam side is higher, dissolved oxygen is added on the high-pressure heater hydrophobic steam side independently by means of the traditional oxygen adding technology, and the realization and the control are difficult. According to the domestic full-protection oxygenation technology, air is added to the hydrophobic steam side through an air compressor, the work load of modification is large, the cost is high, the problems that the concentration of dissolved oxygen at the steam side is high and the concentration of dissolved oxygen at the water side is low exist due to different distribution coefficients of gas in steam and liquid, and the problems that the control accuracy difficulty is high due to the fact that the gas changes along with the pressure and the solubility is different exist under the pressure fluctuation condition and the like exist.
In view of the above, there is a need to provide a hydrophobic system that solves or at least alleviates the above drawbacks.
SUMMERY OF THE UTILITY MODEL
The main object of the utility model is to provide a hydrophobic corrosion protection system, this hydrophobic corrosion protection system aims at solving the serious technical problem of current hydrophobic system base metal corruption.
In order to achieve the purpose, the utility model provides a hydrophobic corrosion protection system, which comprises a condenser, a multi-stage low-pressure heater assembly, a deaerator and a multi-stage high-pressure heater assembly which are connected in sequence; the low-pressure drain pipelines of the multistage low-pressure heater assemblies flow back to the condenser step by step, and the high-pressure drain pipelines of the multistage high-pressure heater assemblies flow back to the deaerator step by step;
the hydrophobic corrosion protection system also comprises a control device, a dosing tank and a pump unit connected with the dosing tank, wherein the pump unit comprises a first control pipeline and a second control pipeline, the first control pipeline is connected with the low-pressure hydrophobic pipeline, and the second control pipeline is connected with the high-pressure hydrophobic pipeline; the first control pipeline and the second control pipeline are respectively in signal connection with the control device so as to distribute the alkalizer in the dosing box according to the command of the control device.
Preferably, the low-pressure drain pipeline is provided with a first pH monitor at a position close to the condenser, the high-pressure drain pipeline is provided with a second pH monitor at a position close to the deaerator, and the first pH monitor and the second pH monitor are respectively in signal connection with the control device.
Preferably, the multistage high-pressure heater subassembly includes first high-pressure heater, second high-pressure heater and the third high-pressure heater that connects gradually, first high-pressure heater's hydrophobic pipeline with the second control tube coupling, the hydrophobic pipeline of third high-pressure heater with the oxygen-eliminating device is connected.
Preferably, the multistage low-pressure heater assembly comprises a first low-pressure heater, a second low-pressure heater, a third low-pressure heater and a fourth low-pressure heater which are connected in sequence, a drain pipeline of the first low-pressure heater is connected with the first control pipeline, and a drain pipeline of the fourth low-pressure heater is connected with the condenser.
Preferably, the pump unit further comprises a standby pump body pipeline, and the first control pipeline, the second control pipeline and the standby pump body pipeline are connected in parallel and then connected with the outlet of the dosing box.
Preferably, the first control pipeline and the second control pipeline are both provided with check valves.
Preferably, the control device is a PLC control cabinet or a DCS control cabinet.
Preferably, the alkalizing agent is ammonia, ethanolamine or morpholine.
The above technical scheme of the utility model in, because hydrophobic corrosion protection system is including the condenser, processing apparatus, multistage low pressure feed water heater subassembly, oxygen-eliminating device and the multistage high pressure feed water heater subassembly that connect gradually. After the exhaust gas of the thermodynamic system of the power plant is input into the condenser, the exhaust gas sequentially passes through the treatment device, the multistage low-pressure heater assembly, the deaerator and the multistage high-pressure heater assembly and is finally output. The hydrophobic corrosion protection system also comprises a control device, a dosing tank and a pump group connected with the dosing tank, wherein an alkalizer is stored in the dosing tank, the pump group comprises a first control pipeline and a second control pipeline, the first control pipeline is connected with the low-pressure hydrophobic pipeline, and the second control pipeline is connected with the high-pressure hydrophobic pipeline; the first control pipeline and the second control pipeline are respectively in signal connection with the control device so as to distribute the alkalizer in the chemical adding box according to the real-time condition of the pH value of the final-stage heater, and therefore the pH value of the steam measurement of the drainage system is improved. The concentration of iron corrosion products can be greatly reduced by increasing the pH value, so that the corrosion of the parent metal of the hydrophobic system is reduced or avoided. In addition, the alkalizer of the drainage pipeline of the multistage high-pressure heater assembly finally flows back to the deaerator, so that the addition amount of the water supply agent is not increased basically, and the operation and maintenance cost of the technical application is low.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a hydrophobic corrosion protection system according to an embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | |
300 | |
| 400 | |
500 | |
| 610 | |
630 | Spare |
| 620 | |
720 | Second |
| 710 | First |
810 | First |
| 730 | Third |
830 | Third |
| 820 | Second low- |
910 | First pH monitor |
| 840 | Fourth |
950 | |
| 920 | Second pH monitor |
The purpose of the present invention, its functional features and advantages will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as the upper and lower … …) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Moreover, the technical solutions of the present invention between the various embodiments can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are combined and contradictory or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and the present invention is not within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a hydrophobic corrosion protection system, which comprises a condenser 100, a multi-stage low pressure heater assembly (composed of a plurality of low pressure heaters, including but not limited to a first low pressure heater 810, a second low pressure heater 820, a third low pressure heater 830 and a fourth low pressure heater 840), a deaerator 300 and a multi-stage high pressure heater assembly (composed of a plurality of high pressure heaters, including but not limited to a first high pressure heater 710, a second high pressure heater 720 and a third high pressure heater 730); the low-pressure drain pipelines of the multistage low-pressure heater assemblies flow back to the condenser 100 step by step, and the high-pressure drain pipelines of the multistage high-pressure heater assemblies flow back to the deaerator 300 step by step;
the hydrophobic corrosion protection system further comprises a control device 400, a dosing box 500 and a pump group connected with the dosing box 500, wherein the pump group comprises a first control pipeline 610 and a second control pipeline 620, the first control pipeline 610 is connected with a low-pressure hydrophobic pipeline, and the second control pipeline 620 is connected with a high-pressure hydrophobic pipeline; the first control line 610 and the second control line 620 are respectively in signal connection with the control device 400 to dispense the alkalizing agent in the dosing tank 500 in accordance with a command from the control device 400.
The above technical scheme of the utility model in, because hydrophobic corrosion protection system is including the condenser 100, multistage low pressure feed water heater subassembly, oxygen-eliminating device 300 and the multistage high pressure feed water heater subassembly that connect gradually. After the exhaust gas of the thermodynamic system of the power plant is input into the condenser 100, the exhaust gas passes through the multistage low-pressure heater assembly, the deaerator 300 and the multistage high-pressure heater assembly in sequence and is finally output. The hydrophobic corrosion protection system further comprises a control device 400, a dosing box 500 and a pump group connected with the dosing box 500, wherein an alkalizer is stored in the dosing box 500, the pump group comprises a first control pipeline 610 and a second control pipeline 620, the first control pipeline 610 is connected with a low-pressure hydrophobic pipeline, and the second control pipeline 620 is connected with a high-pressure hydrophobic pipeline; the first control line 610 and the second control line 620 are respectively in signal connection with the control device 400 to deliver the alkalizing agent in the dosing tank 500 according to the real-time status of the final stage heater pH value, thereby increasing the pH value of the steam measurement of the drainage system. The concentration of iron corrosion products can be greatly reduced by increasing the pH value, so that the corrosion of the parent metal of the hydrophobic system is reduced or avoided. In addition, the alkalizer of the drainage pipeline of the multistage high-pressure heater assembly finally flows back to the deaerator 300, so that the addition amount of the water supply agent is not increased basically, and the operation and maintenance cost of the technical application is low.
The condenser 100 and the deaerator 300 are common components of a thermal system of a power plant, and will not be described in detail herein. It can be understood that the multistage low pressure heater assembly is formed by connecting a plurality of low pressure heaters in sequence, the low pressure heaters comprise a liquid side positioned on the inner wall of the heater pipeline and a vapor side positioned on the outer wall of the heater pipeline, so that heat exchange is completed, and the multistage high pressure heater assembly is similar. The low-pressure drain pipelines of the multistage low-pressure heater assemblies gradually flow back to the condenser 100, and the high-pressure drain pipelines of the multistage high-pressure heater assemblies gradually flow back to the deaerator 300, so that steam of the thermodynamic system enters the deaerator 300 from the high-pressure drain pipelines after heat exchange is completed in the multistage high-pressure heater assemblies; after heat exchange is completed in the multi-stage low-pressure heater assembly, the water enters the condenser 100 from the low-pressure drain line.
As a preferred embodiment of the present invention, the low pressure drain line is provided with the first pH monitor 910 at a position close to the condenser 100, the high pressure drain line is provided with the second pH monitor 920 at a position close to the deaerator 300, and the first pH monitor 910 and the second pH monitor 920 are respectively connected to the control device 400 through signals. Further, the control device 400 is a PLC control cabinet or a DCS control cabinet, and the PLC control cabinet or the DCS control cabinet controls dispensing of the drug to the pump set according to the pH condition of the final stage heater, so as to ensure that the pH value is within a preset range. It should be noted that the position of the low-pressure drain line close to the condenser 100 is the final stage of the multi-stage low-pressure heater assembly, and the position of the high-pressure drain line close to the deaerator 300 is the final stage of the multi-stage high-pressure heater assembly. Thus, the first pH monitor 910 reflects the pH of the final stage low pressure heater and the second pH monitor 920 reflects the pH of the final stage high pressure heater.
In this embodiment, the pH of the final heater is monitored using hydrophobic on-line pH monitoring to control the pH range from 9.0 to 9.7. The pH value is fed back to the control device 400, and the control device 400 controls the opening degree and the dosing frequency of the pump bodies of the first control pipeline 610 and the second control pipeline 620 so as to realize automatic dosing control. In order to ensure that the pH value range of the feed water under the original OT, AVT (O) or AVT (R) treatment mode is kept unchanged, the ammonia adding amount of the feed water is adjusted at the right time through automatic dosing control.
As a specific embodiment of the present invention, the multistage high pressure heater assembly includes the first high pressure heater 710, the second high pressure heater 720 and the third high pressure heater 730 which are connected in sequence, the drain pipeline of the first high pressure heater 710 is connected with the second control pipeline 620, and the drain pipeline of the third high pressure heater 730 is connected with the deaerator 300. The drain reflux of the first high pressure heater 710 enters the second high pressure heater 720, the drain reflux of the second high pressure heater 720 enters the third high pressure heater 730, and the drain reflux of the third high pressure heater 730 enters the deaerator 300. The steam side of the drainage system is the steam side of the high-pressure heaters and the steam side of the low-pressure heaters. Correspondingly, the multi-stage low-pressure heater assembly comprises a first low-pressure heater 810, a second low-pressure heater 820, a third low-pressure heater 830 and a fourth low-pressure heater 840 which are sequentially connected, a drain pipeline of the first low-pressure heater 810 is connected with the first control pipeline 610, and a drain pipeline of the fourth low-pressure heater 840 is connected with the condenser 100. The drain reflux of the first low pressure heater 810 enters the second low pressure heater 820, the drain reflux of the second low pressure heater 820 enters the third low pressure heater 830, the drain reflux of the third low pressure heater 830 enters the fourth low pressure heater 840, and the drain reflux of the fourth low pressure heater 840 enters the condenser 100.
Preferably, the pump unit further comprises a spare pump body pipeline 630, and the first control pipeline 610, the second control pipeline 620 and the spare pump body pipeline 630 are connected in parallel and then connected with the outlet of the dosing tank 500. The first control line 610, the second control line 620 and the standby pump body line 630 are all independently provided with pump body control. Wherein the standby pump body line 630 is in communication with the first control line 610 and the second control line 620. Further, a check valve 950 is disposed on each of the first control line 610 and the second control line 620, and the check valve 950 is used for limiting a flow direction of the fluid in the pipe. Of course, each section of the hydrophobic corrosion protection system may be provided with a check valve 950 to limit the direction of flow of the fluid in the pipe.
In addition, in order to adapt to the environment on the steam side of a drainage system, the alkalizer meeting the requirements of no difference or small difference of ① gas-liquid distribution coefficients, no decomposition under ② high-temperature and high-pressure conditions or no adverse effect of decomposition products on steam-water quality, and no adverse effect of ③ on condensed water fine treatment resin can be selected.
Furthermore, the utility model also provides a corrosion protection method of hydrophobic corrosion protection system is applied to above hydrophobic corrosion protection system, and the corrosion protection method includes:
and (3) dispensing an alkalizer into the low-pressure drain pipeline and the high-pressure drain pipeline so as to keep the pH values in the low-pressure drain pipeline and the high-pressure drain pipeline between 9.0 and 9.7.
In this embodiment, the alkalizer in the dosing tank 500 is delivered according to the real-time status of the pH of the final heater, so as to increase the pH of the steam measurement of the hydrophobic corrosion protection system, and keep the pH in the hydrophobic pipeline at 9.0 to 9.7. The concentration of iron corrosion products can be greatly reduced by increasing the pH value, so that the corrosion of the parent metal of the hydrophobic system is reduced or avoided.
Preferably, the step of dispensing the alkalizer into the low-pressure hydrophobic pipeline and the high-pressure hydrophobic pipeline further comprises the following steps: closing the vapor side continuous exhaust steam gate of the low pressure heater assembly and the vapor side continuous exhaust steam gate of the high pressure heater assembly. So as to ensure the stability of the operation of the drainage system.
Among the above technical solution of the utility model, above only be the utility model discloses a preferred embodiment, not consequently the restriction the utility model discloses a patent range, all be in the utility model discloses a under the technical concept, utilize the equivalent structure transform that the content was done in description and the attached drawing, or direct/indirect application all includes in other relevant technical field the utility model discloses a patent protection scope.
Claims (8)
1. A hydrophobic corrosion protection system is characterized by comprising a condenser, a multistage low-pressure heater assembly, a deaerator and a multistage high-pressure heater assembly which are sequentially connected; the low-pressure drain pipelines of the multistage low-pressure heater assemblies flow back to the condenser step by step, and the high-pressure drain pipelines of the multistage high-pressure heater assemblies flow back to the deaerator step by step;
the hydrophobic corrosion protection system also comprises a control device, a dosing tank and a pump unit connected with the dosing tank, wherein the pump unit comprises a first control pipeline and a second control pipeline, the first control pipeline is connected with the low-pressure hydrophobic pipeline, and the second control pipeline is connected with the high-pressure hydrophobic pipeline; the first control pipeline and the second control pipeline are respectively in signal connection with the control device so as to distribute the alkalizer in the dosing box according to the command of the control device.
2. The hydrophobic corrosion protection system according to claim 1, wherein the low pressure hydrophobic pipeline is provided with a first pH monitor at a position close to the condenser, the high pressure hydrophobic pipeline is provided with a second pH monitor at a position close to the deaerator, and the first pH monitor and the second pH monitor are respectively in signal connection with the control device.
3. The hydrophobic corrosion protection system of claim 1, wherein the multi-stage high pressure heater assembly comprises a first high pressure heater, a second high pressure heater and a third high pressure heater which are connected in sequence, a hydrophobic pipeline of the first high pressure heater is connected with the second control pipeline, and a hydrophobic pipeline of the third high pressure heater is connected with the deaerator.
4. The hydrophobic corrosion protection system according to claim 1, wherein the multi-stage low pressure heater assembly comprises a first low pressure heater, a second low pressure heater, a third low pressure heater and a fourth low pressure heater which are connected in sequence, a drain line of the first low pressure heater is connected with the first control line, and a drain line of the fourth low pressure heater is connected with the condenser.
5. The hydrophobic corrosion protection system according to any one of claims 1 to 4, wherein the pump unit further comprises a spare pump body pipeline, and the first control pipeline, the second control pipeline and the spare pump body pipeline are connected in parallel and then connected with the outlet of the dosing tank.
6. The hydrophobic corrosion protection system of any one of claims 1 to 4 wherein a check valve is provided on each of the first and second control lines.
7. The hydrophobic corrosion protection system according to any of claims 1 to 4, wherein the control device is a PLC or DCS control cabinet.
8. The hydrophobic corrosion protection system according to any of claims 1 to 4, wherein the alkalinizing agent is ammonia, ethanolamine or morpholine.
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| CN201921692319.XU CN210801139U (en) | 2019-10-09 | 2019-10-09 | Hydrophobic corrosion protection system |
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| CN201921692319.XU CN210801139U (en) | 2019-10-09 | 2019-10-09 | Hydrophobic corrosion protection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110657418A (en) * | 2019-10-09 | 2020-01-07 | 润电能源科学技术有限公司 | Hydrophobic corrosion protection system and corrosion protection method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110657418A (en) * | 2019-10-09 | 2020-01-07 | 润电能源科学技术有限公司 | Hydrophobic corrosion protection system and corrosion protection method thereof |
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