CN217082526U - Pre-film detection device of drum boiler and drum boiler - Google Patents
Pre-film detection device of drum boiler and drum boiler Download PDFInfo
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- CN217082526U CN217082526U CN202220443230.5U CN202220443230U CN217082526U CN 217082526 U CN217082526 U CN 217082526U CN 202220443230 U CN202220443230 U CN 202220443230U CN 217082526 U CN217082526 U CN 217082526U
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Abstract
The utility model relates to a drum boiler's pre-filming detection device and drum boiler, pre-filming detection device includes: the monitoring unit comprises a first monitoring mechanism arranged on a superheater pipeline of the drum boiler and/or a second monitoring mechanism arranged on a reheater pipeline of the drum boiler, wherein the first monitoring mechanism is used for detecting the hydrogen content of the superheater pipeline, and the second monitoring mechanism is used for detecting the hydrogen content of the reheater pipeline; and the control mechanism is in communication connection with the first monitoring mechanism and/or the second monitoring mechanism respectively and is used for receiving the hydrogen content detected by the first monitoring mechanism and/or the second monitoring mechanism and judging the corrosion degree of the superheater pipeline and/or the reheater pipeline according to the received hydrogen content. This disclosed prefilming detection device, through the hydrogen content that detects superheater pipeline and/or reheater pipeline, control mechanism judges the degree of corrosion of superheater pipeline and/or reheater pipeline according to the hydrogen content that receives to the prefilming effect of evaluation pipeline.
Description
Technical Field
The utility model relates to a boiler oxidation corrosion detection technical field, specifically relates to a membrane detection device and drum boiler in advance of drum boiler.
Background
In modern industry, the quality of water vapor in thermodynamic systems is an important factor affecting the safe and economic operation of boilers, turbines and other thermal equipment. Poor water quality can lead to metal corrosion, and corrosion products can make the water quality worse, which further exacerbates metal corrosion and scaling. The vicious circle results in shortened service life of the thermal equipment, and causes great economic loss and potential safety hazard.
In order to prevent corrosion and scaling of drum boilers and thermodynamic system equipment, the quality of water vapor should meet certain standards. To see if it meets the standard, various water vapor qualities are measured using instruments or analytical chemistry, and necessary measures are taken based on the measurement results.
The drum boiler belongs to subcritical high-parameter large-capacity unit, has changed whole superheater pipeline and 50% reheater pipeline during overhaul, needs to carry out the prefilming to these new pipelines, and in the in-service use, how to evaluate the prefilming effect of drum boiler superheater pipeline and reheater pipeline is the problem that awaits a urgent need to be solved.
SUMMERY OF THE UTILITY MODEL
An object of the present disclosure is to provide a prefilming detection device for a drum boiler, which can detect corrosion conditions of a superheater pipeline and a reheater pipeline of the drum boiler in a high-temperature oxidation state, and judge the prefilming effect according to the corrosion degree.
Another object of the present disclosure is to provide a drum boiler, which employs the above pre-film detection apparatus.
In order to achieve the above object, in a first aspect of the present disclosure, there is provided a prefilming device for a drum boiler, the prefilming device comprising:
the monitoring unit comprises a first monitoring mechanism arranged on a superheater pipeline of the drum boiler and/or a second monitoring mechanism arranged on a reheater pipeline of the drum boiler, wherein the first monitoring mechanism is used for detecting the hydrogen content of the superheater pipeline, and the second monitoring mechanism is used for detecting the hydrogen content of the reheater pipeline;
and the control mechanism is in communication connection with the first monitoring mechanism and/or the second monitoring mechanism respectively, and is used for receiving the hydrogen content detected by the first monitoring mechanism and/or the second monitoring mechanism and judging the corrosion degree of the superheater pipeline and/or the reheater pipeline according to the received hydrogen content.
Optionally, the first monitoring mechanism includes a first cooling pipeline and a first thermal conductivity sensor, and the first thermal conductivity sensor is communicated with the superheater pipeline through the first cooling pipeline;
the second monitoring mechanism comprises a second cooling pipeline and a second heat conduction sensor, and the second heat conduction sensor is communicated with the reheater pipeline through the second cooling pipeline.
Optionally, the pre-filming detection device further comprises a dosing unit, wherein the dosing unit is used for adding a material capable of adjusting the pH value in a water supply pipeline of the steam drum boiler.
Optionally, the dosing unit comprises an ammonia adding mechanism, and the ammonia adding mechanism is arranged on an outlet pipeline of a deaerator of the drum boiler and is used for adding ammonia liquid into the outlet pipeline;
the ammonia adding mechanism is in communication connection with the control mechanism.
Optionally, the pre-filming detection device further comprises a first PH sensor, and the first PH sensor is arranged on a water supply pipeline between a steam drum of the steam drum boiler and the high-temperature heating mechanism and used for detecting a PH value in the water supply pipeline.
Optionally, the dosing unit further comprises an alkali adding mechanism, and the alkali adding mechanism is arranged on a water supply pipeline of the drum boiler, connected with the drum, and is positioned between the first PH sensor and the drum;
the alkali adding mechanism is in communication connection with the control mechanism.
Optionally, the pre-filming detection device further includes a second PH sensor, and the second PH sensor is disposed on a superheater pipeline of the drum boiler and is configured to detect a PH value in the superheater pipeline.
Optionally, the pre-filming detection device further comprises a display mechanism, and the display mechanism is in communication connection with the first PH sensor, the second PH sensor and the control mechanism respectively.
Optionally, the display mechanism comprises a first meter and a second meter;
the first instrument is used for displaying the detection result of the first PH sensor; the second instrument is used for displaying the detection result of the second PH sensor.
In a second aspect of the present disclosure, a drum boiler is further provided, which includes the pre-filming detection apparatus provided in the first aspect of the present disclosure.
Through above-mentioned technical scheme, this disclosure provides a pre-filming detection device of drum boiler promptly, through set up first monitoring mechanism on the superheater pipeline of drum boiler and/or set up second monitoring mechanism on the reheater pipeline of drum boiler, with the hydrogen content that detects superheater pipeline and/or reheater pipeline, and transmit the hydrogen content information that detects for control mechanism, control mechanism judges the degree of corrosion of superheater pipeline and/or reheater pipeline according to the hydrogen content that receives, thereby the pre-filming effect of evaluation pipeline.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a schematic view of an installation structure of a pre-filming detection device of a drum boiler provided by some embodiments of the present disclosure;
fig. 2 is a schematic view of an installation structure of a dosing unit, a first PH sensor and a second PH sensor of a pre-film detection device of a drum boiler according to some embodiments of the present disclosure.
Description of the reference numerals
1-water supply pipeline; 2-steam drum; 3-superheater piping; 4-reheater piping; 51-a high pressure turbine; 52-medium pressure steam turbine; 53-low pressure turbine; 61-high temperature heating mechanism; 62-a low temperature heating mechanism; 7-a deaerator; 8-an outlet line;
110-a first monitoring mechanism; 120-a second monitoring mechanism; 200-a control mechanism; 310-an ammonia addition mechanism; 320-an alkali adding mechanism; 410-a first PH sensor; 420-a second PH sensor; 500-display mechanism.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
In the present disclosure, unless otherwise specified, the use of directional terms such as "upper, lower, left, and right" generally means that the directions of the drawing of the corresponding drawing are defined with reference to the drawings, "inner and outer" means that the corresponding components are inner and outer in outline, and "distal and proximal" means that the corresponding structure or the corresponding components are distant from each other or another structure or component, and further, it should be noted that the use of terms such as "first, second" and the like is intended to distinguish one element from another.
As shown in fig. 1 and 2, the drum boiler may include a drum 2, a superheater pipeline 3, a reheater pipeline 4, a deaerator 7, a turbine set including a high pressure turbine 51, an intermediate pressure turbine 52, and a low pressure turbine 53, and a heating unit including a high temperature heating mechanism 61 and a low temperature heating mechanism 62. The outlet of the steam pocket 2 is connected with the high pressure turbine 51 through the reheater pipeline 4, the high pressure turbine 51 is connected with the medium pressure turbine 52 through the reheater pipeline 4, the medium pressure turbine 52 is connected with the low pressure turbine 53 and the high temperature heating mechanism 61 respectively, the low pressure turbine 53 is connected with the deaerator 7 and the high temperature heating mechanism 61 respectively through the low pressure heating mechanism, the deaerator 7 is connected with the high temperature heating mechanism 61, and the high temperature heating mechanism 61 is connected with the inlet of the steam pocket 2 through the water feeding pipeline 1.
As shown in fig. 1, in a first aspect of the present disclosure, there is provided a pre-film detection device for a drum boiler, the pre-film detection device comprising: the monitoring unit comprises a first monitoring mechanism 110 arranged on a superheater pipeline 3 of the drum boiler and/or a second monitoring mechanism 120 arranged on a reheater pipeline 4 of the drum boiler, wherein the first monitoring mechanism 110 is used for detecting the hydrogen content of the superheater pipeline 3, and the second monitoring mechanism 120 is used for detecting the hydrogen content of the reheater pipeline 4; the control mechanism 200 is in communication connection with the first monitoring mechanism 110 and/or the second monitoring mechanism 120, respectively, and is configured to receive the hydrogen content detected by the first monitoring mechanism 110 and/or the second monitoring mechanism 120, and determine the corrosion degree of the superheater pipeline 3 and/or the reheater pipeline 4 according to the received hydrogen content.
Through the technical scheme, this disclosure provides a pre-filming detection device of drum boiler promptly, through set up first monitoring mechanism 110 on the superheater pipeline 3 of drum boiler and/or set up second monitoring mechanism 120 on the reheater pipeline 4 of drum boiler, with the hydrogen content that detects superheater pipeline 3 and/or reheater pipeline 4, and transmit the hydrogen content information that detects for control mechanism 200, control mechanism 200 judges the degree of corrosion of superheater pipeline 3 and/or reheater pipeline 4 according to the hydrogen content that receives, thereby the pre-filming effect of evaluation pipeline.
It should be noted that the control mechanism 200 may include a controller and a memory, data of different corrosion degrees corresponding to different hydrogen contents may be stored in the memory, and after receiving the information of the hydrogen content, the controller compares the information with the data in the memory to obtain the corrosion degree corresponding to the hydrogen content. It will be appreciated that data for different levels of corrosion for different hydrogen contents may be obtained experimentally or empirically in practical applications.
In some embodiments, the first monitoring mechanism 110 may be disposed on the superheater pipeline 3 only, the first monitoring mechanism 110 detects the hydrogen content in the superheater pipeline 3, and transmits information of the hydrogen content to the control mechanism 200, and the control mechanism 200 determines the corrosion degree of the superheater pipeline 3 according to the hydrogen content, so as to evaluate the pre-filming effect in the superheater pipeline 3; the second monitoring mechanism 120 may be disposed on the reheater pipe 4, the second monitoring mechanism 120 is used to detect the hydrogen content in the reheater pipe 4, and transmit the information of the hydrogen content to the control mechanism 200, and the control mechanism 200 determines the corrosion degree of the reheater pipe 4 according to the hydrogen content, so as to evaluate the pre-filming effect in the reheater pipe 4.
Of course, the first monitoring mechanism 110 may also be disposed on the superheater pipeline 3, and the second monitoring mechanism 120 is disposed on the reheater pipeline 4, the hydrogen content in the superheater pipeline 3 is detected by the first monitoring mechanism 110, the hydrogen content in the reheater pipeline 4 is detected by the second monitoring mechanism 120, and the information about the hydrogen content in the superheater pipeline 3 and the reheater pipeline 4 is transmitted to the control mechanism 200, the control mechanism 200 determines the corrosion degree of the superheater pipeline 3 and the reheater pipeline 4 according to the hydrogen content, so as to evaluate the pre-filming effect in the superheater pipeline 3 and the reheater pipeline 4.
In some embodiments of the present disclosure, the first monitoring mechanism 110 includes a first cooling line and a first thermal conductivity sensor, the first thermal conductivity sensor being in communication with the superheater line 3 through the first cooling line; the second monitoring mechanism 120 includes a second cooling line and a second thermal conductivity sensor, and the second thermal conductivity sensor is communicated with the reheater line 4 through the second cooling line.
One end of the first cooling pipeline is communicated with the superheater pipeline 3, the other end of the first cooling pipeline is connected with the first heat conduction sensor, the first cooling pipeline is used for cooling high-temperature and high-pressure gas in the superheater pipeline 3 into normal-temperature and normal-pressure liquid, and the hydrogen content is cooled by the first heat conduction sensor; similarly, one end of the second cooling pipeline is communicated with the reheater pipeline 4, the other end of the second cooling pipeline is connected with the second thermal conductivity sensor, the second cooling pipeline is used for cooling high-temperature and high-pressure gas in the reheater pipeline 4 into liquid at normal temperature and normal pressure, and the hydrogen content is cooled by the second thermal conductivity sensor. It should be noted that the measurement of the hydrogen content by the thermal conductivity sensor can be realized by the specific manner disclosed in the related art, and the detailed description is omitted here.
Under normal conditions, the liquid in the pipeline is in alkalescence, so that an oxide film is formed, corresponding equipment and the pipeline are protected, and the service life of the pipeline is prolonged. In order to adjust the pH value in the superheater pipeline 3 and the reheater pipeline 4 of the drum boiler, an oxidation film is better formed in the pipelines, the corrosion resistance of the drum boiler is improved, and the service life of the drum boiler is prolonged. In some embodiments, the pre-filming detection device further comprises a dosing unit, and the dosing unit is used for adding a material capable of adjusting the PH value in the water supply pipeline 1 into the water supply pipeline 1 of the drum boiler.
As shown in fig. 2, in some embodiments of the present disclosure, the dosing unit may include an ammonia adding mechanism 310, where the ammonia adding mechanism 310 is disposed on the outlet pipe 8 of the deaerator 7 of the drum boiler, and is used for adding ammonia liquid into the outlet pipe 8; the ammonia adding mechanism 310 is in communication with the control mechanism 200.
In some embodiments, the ammonia adding mechanism 310 includes a first chemical adding pump capable of adding ammonia water to the outlet pipeline 8 of the deaerator 7, the first chemical adding pump is in communication connection with the control mechanism 200, the first chemical adding pump adds ammonia liquid to the outlet pipeline 8 under the control of the control mechanism 200 according to the hydrogen content in the superheater pipeline 3 detected by the first thermal conductivity sensor and/or according to the hydrogen content in the reheater pipeline 4 detected by the second thermal conductivity sensor, the ammonia liquid enters the water supply pipeline 1 after passing through the high-temperature heating mechanism 61, and then enters the steam drum 2 and the superheater pipeline 3 and the reheater pipeline 4; meanwhile, the control mechanism 200 can also control the dosing frequency of the first dosing pump, so that a proper amount of ammonia liquid is reasonably supplemented into the outlet pipeline 8 of the deaerator 7, and the pre-filming effect of the superheater pipeline 3 and the reheater pipeline 4 of the drum boiler is improved.
In order to improve the precision of the pre-filming detection device and improve the feeding of ammonia liquid by the first dosing pump in a more appropriate proportion, as shown in fig. 2, in some embodiments of the present disclosure, the pre-filming detection device further includes a first PH sensor 410, and the first PH sensor 410 is disposed on the water feeding pipeline 1 between the drum 2 and the high-temperature heating mechanism 61 of the drum boiler, and is used for detecting the PH value in the water feeding pipeline 1.
When the first monitoring mechanism 110 and the second monitoring mechanism 120 detect that the hydrogen content in the drum boiler is high, ammonia liquid can be supplemented into the water feeding pipeline 1 of the drum boiler from the outlet pipeline 8 of the deaerator 7 through the first dosing pump of the ammonia adding device, so that the ammonia amount in the pipeline of the drum boiler is supplemented, an oxidation film is formed in the pipeline, the corrosion resistance of the drum boiler is improved, and the service life of the drum boiler is prolonged. Further, set up first PH sensor 410 on the water supply line 1 between the steam pocket 2 of steam pocket boiler and high temperature heating mechanism 61 for detect the PH value of water supply line 1, and feed back the result that detects to control mechanism 200, control mechanism 200 adds the aqueous ammonia in controlling first dosing pump to the pipe according to actual need again, the PH value in the adjustment pipeline, in order to realize more accurate regulation control.
In order to further control the PH value in the drum 2 of the drum boiler, reduce corrosion, and improve the quality of the pre-film inside the drum 2, as shown in fig. 2, in some embodiments of the present disclosure, the dosing unit may further include an alkali adding mechanism 320, where the alkali adding mechanism 320 is disposed on the water supply pipeline 1 of the drum boiler connected to the drum 2 and between the first PH sensor 410 and the drum 2; the alkalizing mechanism 320 is in communication with the control mechanism 200. The alkali adding mechanism 320 includes a second chemical adding pump for adding an alkali solution into the water supply pipeline 1, wherein the alkali solution includes, but is not limited to, a mixed solution of sodium hydroxide and phosphate, and can further adjust the ph value in the pipeline.
When the hydrogen content in the drum boiler is detected to be high, the alkali solution can be supplemented into the water supply pipeline 1 and enters the drum 2 through the alkali adding mechanism 320, so that the pH values in the superheater pipeline 3 and the reheater pipeline 4 of the drum boiler are further improved, more oxidation films are formed in the pipelines, the corrosion resistance of the superheater pipeline 3 and the reheater pipeline 4 of the drum boiler is further improved, and the service life of the whole drum boiler is prolonged.
The alkali adding mechanism 320 comprises a second medicine adding pump, the second medicine adding pump is in communication connection with the controller, the control mechanism 200 controls the medicine adding frequency of the second medicine adding pump according to the hydrogen content in the superheater pipeline 3 of the boiler detected by the first heat conductivity sensor and the hydrogen content in the reheater pipeline 4 detected by the second heat conductivity sensor, so that a proper amount of alkali solution is reasonably supplemented into the steam drum 2, and the use convenience of the superheater pipeline 3 and the reheater pipeline 4 of the steam drum boiler is improved.
In some embodiments, the prefilming device further comprises a second PH sensor 420, the second PH sensor 420 being provided on the superheater circuit 3 of the drum boiler for detecting the PH value in the superheater circuit 3. Wherein, detect the pH value in the superheater pipeline 3 through second PH sensor 420, can judge the pH valve in the drum boiler, then, the rethread control mechanism 200 control locate the water supply pipe line 1 of drum 2 of drum boiler add alkali mechanism 320 and add the alkali solution and adjust, so that the pH value in superheater pipeline 3 and the reheater pipeline 4 of drum boiler maintain a more stable fit for within range, and then form more oxide films in the pipeline, increase the anticorrosive ability of superheater pipeline 3 and the reheater pipeline 4 of drum boiler, further improve its life.
In order to more intuitively display the detection data and results of the pre-film detection device, in some embodiments of the present disclosure, the pre-film detection device further comprises a display mechanism 500, and the display mechanism 500 is in communication connection with the first PH sensor 410, the second PH sensor 420 and the control mechanism 200, respectively. The PH values detected by the first PH sensor 410 and the second PH sensor 420 may be displayed, and the hydrogen gas contents detected by the first monitoring mechanism 110 and the second monitoring mechanism 120 may be displayed. At the same time, the judgment result of the control mechanism 200, that is, the degree of corrosion of the superheater piping 3 and/or the reheater piping 4, for example, primary corrosion, secondary corrosion, and the like, may also be displayed.
The display mechanism 500 may be a display panel or a liquid crystal display screen with a display function, and the display function may be implemented, which is not limited in the present disclosure.
In some embodiments, display mechanism 500 includes a first meter and a second meter; wherein, the first meter is used for displaying the detection result of the first PH sensor 410; the second meter is used for displaying the detection result of the second PH sensor 420. That is, the first instrument can more directly perceivedly demonstrate the pH value in the water supply pipe 1, and the second instrument can more directly perceivedly demonstrate the pH value in the steam pocket 2 to the convenience of use of prefilming detection device has been improved.
When the heat pump unit is actually used, firstly, an outlet pipeline 8 of the deaerator 7 is communicated with the ammonia adding mechanism 310, a water feeding pipeline 1 at the inlet end of the steam drum 2 is communicated with the alkali adding mechanism 320, the first heat conduction sensor is communicated and installed on the superheater pipeline 3 through the first cooling pipeline, and the second heat conduction sensor is communicated and installed on the reheater pipeline 4 through the second cooling pipeline; then, the controller mechanism respectively detects the hydrogen content in the corresponding pipeline according to the first thermal conductivity sensor and the second thermal conductivity sensor, respectively controls the dosing frequency and the dosing frequency of the first dosing pump of the ammonia dosing mechanism 310 and the second dosing pump of the alkali dosing mechanism 320, respectively supplements ammonia liquid into the outlet pipeline 8 of the deaerator 7 and supplements alkali solution into the steam drum 2, reasonably improves the pH value in the water supply pipeline 1 and the steam drum 2, and displays the pH value in the corresponding pipeline through the first instrument and the second instrument, so that the content of dissolved hydrogen in the superheater pipeline 3 and the reheater pipeline 4 of the steam drum boiler is reduced and stabilized, further reduces the oxidation corrosion degree of the pipelines, achieves the pre-membrane effect, and ensures safe and stable operation of the steam drum boiler under the high-temperature and high-pressure working condition.
The second aspect of the present disclosure further provides a drum boiler, which includes the pre-filming detection apparatus provided by the first aspect of the present disclosure, and therefore, the drum boiler also has the advantages of the pre-filming detection apparatus, which is not described herein again.
In summary, the pre-filming detection apparatus of a drum boiler and the drum boiler provided by the present disclosure includes a control mechanism 200, a first monitoring mechanism 110 and/or a second monitoring mechanism 120, wherein the first monitoring mechanism 110 is disposed on the superheater pipeline 3 of the drum boiler and/or the second monitoring mechanism 120 is disposed on the reheater pipeline 4 of the drum boiler, so as to detect the hydrogen content in the superheater pipeline 3 and/or the reheater pipeline 4, and transmit the detected hydrogen content information to the control mechanism 200, and the control mechanism 200 determines the corrosion degree of the superheater pipeline 3 and/or the reheater pipeline 4 according to the received hydrogen content, thereby evaluating the pre-filming effect of the pipeline.
The preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details in the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the above embodiments, the various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations will not be further described in the present disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure as long as it does not depart from the gist of the present disclosure.
Claims (10)
1. A pre-filming detection device of a drum boiler is characterized by comprising:
the monitoring unit comprises a first monitoring mechanism (110) arranged on a superheater pipeline (3) of the drum boiler and/or a second monitoring mechanism (120) arranged on a reheater pipeline (4) of the drum boiler, wherein the first monitoring mechanism (110) is used for detecting the hydrogen content of the superheater pipeline (3), and the second monitoring mechanism (120) is used for detecting the hydrogen content of the reheater pipeline (4);
and the control mechanism (200) is in communication connection with the first monitoring mechanism (110) and/or the second monitoring mechanism (120) respectively, and is used for receiving the hydrogen content detected by the first monitoring mechanism (110) and/or the second monitoring mechanism (120) and judging the corrosion degree of the superheater pipeline (3) and/or the reheater pipeline (4) according to the received hydrogen content.
2. The prefilming device according to claim 1, characterized in that the first monitoring means (110) comprise a first cooling circuit and a first thermal conductivity sensor, which communicates with the superheater circuit (3) via the first cooling circuit;
the second monitoring mechanism (120) comprises a second cooling pipeline and a second heat conduction sensor, and the second heat conduction sensor is communicated with the reheater pipeline (4) through the second cooling pipeline.
3. The pre-filming detection apparatus according to claim 1 or 2, further comprising a dosing unit for adding a material capable of adjusting the pH value in the water supply line (1) of the drum boiler into the water supply line (1).
4. The pre-filming detection apparatus according to claim 3, wherein the dosing unit comprises an ammonia dosing mechanism (310), and the ammonia dosing mechanism (310) is disposed on an outlet pipeline (8) of a deaerator (7) of the drum boiler and is configured to add ammonia liquid into the outlet pipeline (8);
the ammonia adding mechanism (310) is connected with the control mechanism (200) in a communication mode.
5. The prefilming device according to claim 4, characterized in that the prefilming device further comprises a first PH sensor (410), wherein the first PH sensor (410) is arranged on the water supply pipeline (1) between the steam drum (2) and the high-temperature heating mechanism (61) of the steam drum boiler and is used for detecting the PH value in the water supply pipeline (1).
6. The pre-filming detection apparatus according to claim 5, wherein the dosing unit further comprises an alkali adding mechanism (320), the alkali adding mechanism (320) is disposed on a water feeding pipeline (1) of the drum boiler connected to the drum (2) and is located between the first PH sensor (410) and the drum (2);
the alkali adding mechanism (320) is in communication connection with the control mechanism (200).
7. The prefilming device according to claim 6, characterized in that it further comprises a second pH sensor (420), which second pH sensor (420) is arranged on the superheater line (3) of the drum boiler for detecting the pH value in the superheater line (3).
8. The prefilming device according to claim 7, characterized in that it further comprises a display means (500), said display means (500) being in communication connection with said first PH sensor (410), said second PH sensor (420) and said control means (200), respectively.
9. The prefilming device of claim 8, wherein the display means (500) comprises a first meter and a second meter;
the first meter is used for displaying the detection result of the first PH sensor (410); the second meter is used for displaying the detection result of the second PH sensor (420).
10. A drum boiler, characterized in that it comprises a pre-film detection device according to any of claims 1-9.
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| CN202220443230.5U CN217082526U (en) | 2022-03-02 | 2022-03-02 | Pre-film detection device of drum boiler and drum boiler |
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| CN202220443230.5U CN217082526U (en) | 2022-03-02 | 2022-03-02 | Pre-film detection device of drum boiler and drum boiler |
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