CN113137592A - Scale monitoring method for steam generator - Google Patents
Scale monitoring method for steam generator Download PDFInfo
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- CN113137592A CN113137592A CN202110379006.4A CN202110379006A CN113137592A CN 113137592 A CN113137592 A CN 113137592A CN 202110379006 A CN202110379006 A CN 202110379006A CN 113137592 A CN113137592 A CN 113137592A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/38—Determining or indicating operating conditions in steam boilers, e.g. monitoring direction or rate of water flow through water tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/54—De-sludging or blow-down devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/56—Boiler cleaning control devices, e.g. for ascertaining proper duration of boiler blow-down
- F22B37/565—Blow-down control, e.g. for ascertaining proper duration of boiler blow-down
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention relates to a scale monitoring method of a steam generator, which comprises the following steps: step one, determining the scaling degree of scale to be cleaned, reading and recording the limit resistance value between a liquid probe and a metal part under the scaling degree of the scale to be cleaned as R0, and storing the limit resistance value on a control system; in daily use, when the steam generator is in a non-operation state, the control system executes an emptying task to empty the water in the water storage cavity, and then the control system reads and records that the monitoring resistance value between the liquid probe and the metal component in the empty state is R1; step three, the control system calls R1 and R0 to compare; when R1 is not more than R0, the control system judges that the scale reaches or exceeds the scale formation degree of the scale which needs to be cleaned; when R1 is more than R0, the control system judges that the scale does not reach the scale-forming degree required to clean the scale. The water scale monitoring method is high in reliability and accuracy, is suitable for water bodies with different water qualities, and effectively guarantees daily work of the steam generator.
Description
Technical Field
The invention relates to a steam generator, in particular to a scale monitoring method of the steam generator.
Background
The water contains various dissolved salts and exists in the form of ions; when a pair of electrodes is inserted into water, after the electrodes are electrified, under the action of an electric field, charged ions can move in a certain direction, namely anions in the water move to the anode, and cations move to the cathode, so that the water body has a conductive effect. In addition, after the container for storing water is heated for many times, calcium sulfate (CaSO4) which is slightly soluble in water in the water body is separated out due to evaporation of the water body, calcium bicarbonate (Ca (HCO3)2) and magnesium bicarbonate (Mg (HCO3)2 which are originally dissolved are decomposed in boiling water and release carbon dioxide (CO2), and then calcium carbonate (CaCO3) and magnesium hydroxide (Mg (OH)2) which are difficult to dissolve are also precipitated, and MgCO3 is sometimes generated, so that scale is formed; the more the content of Ca, Mg and other substances in the water body is, the easier the scale is formed and the faster the scale is formed; on the other hand, the higher the content of Ca, Mg, etc., the poorer the water quality of the water body, and on the contrary, the lower the content of Ca, Mg, etc., the better the water quality of the water body.
Many existing products in the market use the conductive property of the water body; the related products at least comprise a steam generator, a pair of electrodes is arranged in a cavity for storing water, and the monitoring of the water body is realized by monitoring the resistance value between the two electrodes; however, in daily use, after the steam generator is used for a long time, a large amount of scale is formed in the water storage cavity, and the existence of the scale at least causes the following problems: firstly, the normal work of the electrode is influenced to cause misjudgment, secondly, the heating efficiency is reduced, the energy consumption is increased, and the like; therefore, scale needs to be cleaned, the conventional method is that a scale cleaning period is set before a steam generator leaves a factory, namely, when the working time of the steam generator is up to one scale cleaning period, a user is prompted to clean the scale; however, this is an unreliable scale monitoring approach: if the water quality of the daily used water body is good, the scaling speed in the cavity is low, even if the scale cleaning period is reached, the scaling degree is not serious, and scale cleaning is not needed at the moment; if the water quality of the daily used water body is poor, the scaling speed in the cavity is high, even if the scaling period is not reached, the scaling degree is also high, the scaling period does not reach, and the work of the steam generator is seriously influenced. Therefore, there is a need for further improvements in scale monitoring methods.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the water scale monitoring method of the steam generator.
The purpose of the invention is realized as follows:
a scale monitoring method of a steam generator comprises a liquid probe and a metal component for heat conduction or heat generation, wherein the liquid probe and the metal component are respectively connected with a control system; the method is characterized in that: the scale monitoring method applied to the steam generator comprises the following steps:
step one, determining the scaling degree of scale to be cleaned, reading and recording the limit resistance value between a liquid probe and a metal part under the scaling degree of the scale to be cleaned as R0, and storing the limit resistance value on a control system;
in daily use, when the steam generator is in a non-operation state, the control system executes an emptying task to empty the water in the water storage cavity, and then the control system reads and records that the monitoring resistance value between the liquid probe and the metal component in the empty state is R1;
step three, the control system calls R1 and R0 to compare; when R1 is not more than R0, the control system judges that the scale reaches or exceeds the scale formation degree of the scale which needs to be cleaned; when R1 is more than R0, the control system judges that the scale does not reach the scale-forming degree required to clean the scale.
And after the steam generator is subjected to emptying task every time, the control system reads and records the monitoring resistance value again.
For each recorded R1 read, the control system stores and builds a corresponding mathematical model and/or graph.
The graph is drawn by using time T1 and a monitoring resistance value R1, a corresponding change line is drawn between the previous R1 and the new R1 after the control system reads and records each time, the inclination theta of the change line is calculated, and when the inclination theta is larger than or equal to the set delta theta, the control system prompts that the water quality of the water body is seriously reduced.
The scale monitoring method further comprises a fourth step;
step four, performing a first step of cleaning the substrate,
when R1 is not more than R0, the control system controls the steam generator not to work and sends out a scale cleaning prompt, after a user finishes cleaning the scale, the control system reads the record R1 again, the steam generator is determined to be put into operation again after R1 is more than R0, and if R1 is not more than R0, the control system continues to send out the scale cleaning prompt;
when R1 > R0, the steam generator continues to be put into operation.
In the first step, the non-operation state includes a post-state after the steam generator completes the previous operation and a pre-state before the steam generator performs the next operation.
In the second step, the method for judging the water body emptying in the water storage cavity comprises the following steps: a load dump method, a timed dump method, and a flow dump method;
the steam generator applying the load emptying method comprises a drainage pump connected with a control system, wherein the drainage pump is arranged on a drainage waterway communicated with the water storage cavity, and the control system monitors the load condition of the drainage pump; the load evacuation method comprises the following steps: step a1, the control system executes the drainage task to start the drainage pump and monitor the load condition of the drainage pump; step a2, when the drainage pump enters the no-load state, the control system finishes the drainage task to close the drainage pump and judges that the water in the water storage cavity is emptied;
the steam generator applying the timing emptying method comprises a timing module connected with a control system, wherein the control system is provided with a drainage time T0; the timed emptying method comprises the following steps: step b1, the control system executes the drainage task and starts the timing module; b2, when the time reading on the timing module reaches T0, the control system finishes the drainage task and judges that the water in the water storage cavity is emptied;
the steam generator applying the flow emptying method comprises a flow meter connected with a control system, wherein the flow meter is arranged on a drainage waterway communicated with the water storage cavity; the flow evacuation method comprises the following steps: step c1, the control system executes the drainage task and monitors the water flow of the drainage waterway through the flowmeter; and step c2, when the reading of the flowmeter is 0, the control system finishes the drainage task and judges that the water in the water storage cavity is drained.
The liquid probe end extends to be close to the metal part; alternatively, the liquid probe side is disposed adjacent to the metal component.
The liquid probe and/or the metal member are made of a conductive metal such as a copper material.
The invention has the following beneficial effects:
the method comprises the steps of determining the scaling degree of scale to be cleaned in advance, detecting the corresponding limit resistance value between a liquid probe and a metal part under the scaling degree to be R0, and storing the limit resistance value on a control system; reading and recording the monitoring resistance value detected by the liquid probe to be R1 before or after each operation of the steam generator; finally, comparing R1 with R0, if R1 is less than or equal to R0, judging that the scale reaches or exceeds the scale formation degree of the scale to be cleaned, and further sending a scale cleaning prompt; and if R1 is more than R0, judging that the scale does not reach the scale formation degree required to be cleaned, and continuing to put the steam generator into operation. The scale monitoring method can effectively monitor the scaling degree based on the resistance value, and further can accurately inform a user of scale cleaning. The scale monitoring method can accurately monitor the scaling degree of the water storage cavity, has reliable performance, can adapt to different use environments, and ensures that the steam generator is stable, reliable, effective and durable. It should be noted that the scale monitoring method can be applied to other devices where scale may appear, besides the steam generator.
Drawings
Fig. 1 is a partial structural view of a steam generator according to an embodiment of the present invention.
Fig. 2 is a flow chart of a scale monitoring method according to an embodiment of the invention.
FIG. 3 is a mathematical model based on the usage time and the monitored resistance value according to an embodiment of the present invention.
FIG. 4 is a graph plotting time of use and monitored resistance values according to an embodiment of the present invention.
Fig. 5 is an enlarged view of a in fig. 4.
Detailed Description
The invention is further described with reference to the following figures and examples.
Referring to fig. 1 and 5, the steam generator according to the embodiment includes a liquid probe 4, a metal component 5 for conducting heat or generating heat, and a water inlet pump 9 for injecting water and replenishing water, the liquid probe 4 and the metal component 5 are respectively connected to the control system 1, when a conductive medium is present between the liquid probe 4 and the metal component 5, a resistance value of the conductive medium (the conductive medium of the embodiment includes a water body, scale, and the like) can be timely detected to the control system 1, the water inlet pump 9 is respectively controlled by the control system 1, the metal component 5 is disposed at the bottom of the water storage cavity 3 and at least partially contacts with the water body in a use state, the metal component 5 can be a part of a heating body (used for heating the water body to generate steam) or a separately disposed component, and the water inlet pump 9 is disposed on a water inlet path 7 communicated with the water storage cavity 3;
the scale monitoring method applied to the steam generator comprises the following steps:
step one, determining the scaling degree of water scale to be cleaned in an emptying state before a steam generator leaves a factory, reading and recording the limit resistance value between a liquid probe and a metal part 5 which is in the scaling degree of the water scale to be cleaned as R0, and storing the limit resistance value on a control system 1; specifically, the degree of scaling is determined according to the actual needs of the steam generator, the structural degree and the corresponding limit resistance value thereof can be determined through experimental data or actual use conditions, and the degree of scaling is calculated according to the thickness of the scale in general cases;
in daily use, when the steam generator is in a non-operation state, the control system 1 executes an emptying task to empty the water in the water storage cavity 3, and then the control system 1 reads and records that the monitoring resistance value detected by the liquid probe 4 in the emptying state is R1; the water body is emptied, so that the reading accuracy of the monitoring resistance value can be ensured, accumulated water (waste water) in the water storage cavity 3 can be ensured, and the cleanness of steam can be ensured; in the emptying situation, if the scaling degree reaches the state that the scale on the liquid probe 4 is at least partially contacted with the scale on the metal part 5, the conducting medium between the liquid probe 4 and the metal part 5 is only the scale, so that the real-time detected monitoring resistance value is greatly reduced, namely after the steam generator is used for a long time, the scaling degree is more serious, the monitoring resistance value is smaller, and the R1 refreshed after the steam generator finishes the last work and the scaling degree is monitored in time because the numerical value R1 of the monitoring resistance value is gradually changed along with the use time;
step three, the control system 1 calls R1 and R0 to compare; when R1 is not more than R0, the control system 1 judges that the scale reaches or exceeds the scale formation degree of the scale which needs to be cleaned; when R1 > R0, the control system 1 determines that the scale has not reached the scale formation level at which the scale needs to be cleaned.
Further, after the steam generator is emptied, the control system 1 reads the recorded monitoring resistance value R1 again and updates R1 to grasp the degree of fouling of the steam generator after the last operation.
Further, for each R1 reading the record, the control system 1 stores and establishes a corresponding mathematical model (see fig. 3) and a graph (see fig. 4) so as to perform statistics, analysis and the like on R1 at a later period; the graph is drawn by using time T1 and a monitoring resistance value R1, a corresponding change line is drawn between the previous R1 and the new R1 after the control system 1 reads and records each time, the inclination theta of the change line is calculated, and when the inclination theta is larger than or equal to the set delta theta, the control system 1 prompts that the water quality of the water body is seriously reduced. In FIG. 3, 2020-01-26 is the time of the first operation of the steam generator, and the corresponding R1 is R1- (1), and θ is θ (1); 2021-02-10 is the time of the thirty-fifth work, the corresponding R1 is R1- (35), theta is theta (35); that is, 20XX-XX-XX is the time of the beta-th operation, and the corresponding R1 is R1- (beta), theta is theta (beta), and beta is a positive integer. In fig. 4, the variation lines between the time points together form a corresponding function curve to more visually reflect the variation of the monitored resistance value, wherein R1- (β) < R0 measured at the time point T10, so the control system sends out a scale cleaning prompt; in fig. 5, the control system 1 monitors the slope θ of the change line between two adjacent time points, taking the change line HI in the figure as an example, the coordinate of the previous monitoring point H is (x 1, 1), the coordinate of the next monitoring point I is (x 2, y 2), θ = arctan [ y2-y 1)/(x 2-x1 ], and θ calculated in fig. 5 is greater than Δ θ, that is, after the steam generator is operated for the time, the scaling condition is relatively serious, which directly reflects that the water quality of the water body is poor, and the control system 1 sends a corresponding prompt.
Further, the scale monitoring method also comprises a fourth step;
step four, performing a first step of cleaning the substrate,
when R1 is not more than R0, the control system 1 controls the steam generator to stop working and sends out a scale cleaning prompt, after a user finishes cleaning scales, the control system 1 reads the record R1 again, the steam generator is determined to be put into operation again after R1 is more than R0, and if R1 is not more than R0, the control system 1 continues to send out the scale cleaning prompt;
when R1 > R0, the steam generator continues to be put into operation.
Further, in the first step, the non-operation state includes a post-state after the steam generator completes the previous operation and a pre-state before the steam generator performs the next operation; specifically, the evacuation task is executed in a post-state, namely the evacuation task is executed after the steam generator completes the operation task; executing an emptying task in a pre-set state, namely executing the emptying task before the steam generator starts to work, wherein fig. 3 is a mathematical model established in the pre-set state; of course, the emptying task may be performed in both the forward and the backward state, respectively.
Further, in the second step, the method for judging the emptying of the water body in the water storage cavity 3 comprises the following steps: a load dump method, a timed dump method, and a flow dump method;
the steam generator of the present embodiment employs a load draining method, wherein the steam generator includes a draining pump 8 connected to the control system 1, the draining pump 8 is disposed on a draining waterway 6 communicated with the water storage chamber 3, and the control system 1 monitors a load condition of the draining pump 8; the load evacuation method comprises the following steps: step a1, the control system 1 executes a drainage task to start the drainage pump 8 and monitor the load condition of the drainage pump 8; step a2, when the drain pump 8 enters the no-load state, the control system 1 finishes the drainage task to close the drain pump 8 and judges that the water body in the water storage cavity 3 is empty;
the steam generator applying the timing emptying method comprises a timing module connected with a control system 1, wherein the control system 1 is provided with a drainage time T0, and the drainage mode can be that a drainage pump 8 is arranged to assist quick drainage and a drainage outlet can be opened to freely drain water; the timed emptying method comprises the following steps: step b1, the control system 1 executes the drainage task and starts the timing module; step b2, when the time reading on the timing module reaches T0, the control system 1 finishes the drainage task and judges that the water in the water storage cavity 3 is emptied;
the steam generator applying the flow emptying method comprises a flow meter connected with the control system 1, wherein the flow meter is arranged on a drainage water path 6 communicated with the water storage cavity 3, and the drainage mode can be that a drainage pump 8 is arranged to assist quick drainage and a drainage outlet can be opened to freely drain water; the flow evacuation method comprises the following steps: step c1, the control system 1 executes the drainage task and monitors the water flow of the drainage waterway 6 through the flowmeter; and step c2, when the reading of the flowmeter is 0, the control system 1 finishes the drainage task and judges that the water body in the water storage cavity 3 is empty.
Furthermore, the steam generator comprises a steam outlet 2 communicated with the water storage cavity 3, the position of the steam outlet 2 is higher than the set highest water level in the water storage cavity 3, and steam generated by heating water is discharged through the steam outlet 2.
Further, the end of the liquid probe 4 in the present embodiment extends to be close to the metal member 5; alternatively, the liquid probe 4 may be provided at its side portion near the metal member 5.
Further, the liquid probe 4 and the metal member 5 are made of conductive metal such as copper material, respectively.
The foregoing is a preferred embodiment of the present invention, and the basic principles, principal features and advantages of the invention are shown and described. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to illustrate the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and the invention is intended to be protected by the following claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A scale monitoring method of a steam generator comprises a liquid probe (4) and a metal part (5), wherein the liquid probe (4) and the metal part (5) are respectively connected with a control system (1); the method is characterized in that: the scale monitoring method applied to the steam generator comprises the following steps:
step one, determining the scaling degree of scale to be cleaned, reading and recording the limit resistance value between a liquid probe (4) and a metal part (5) under the scaling degree of the scale to be cleaned as R0, and storing the limit resistance value on a control system (1);
in daily use, when the steam generator is in a non-operation state, the control system (1) executes an emptying task to empty the water in the water storage cavity (3), and then the control system (1) reads and records that the monitoring resistance value between the liquid probe (4) and the metal part (5) in the empty state is R1;
step three, the control system (1) calls R1 and R0 to compare; when R1 is less than or equal to R0, the control system (1) judges that the scale reaches or exceeds the scale formation degree of the scale which needs to be cleaned; when R1 is larger than R0, the control system (1) judges that the scale does not reach the scale formation degree required to clean the scale.
2. A scale monitoring method of a steam generator according to claim 1, wherein: and after the steam generator is subjected to emptying task every time, the control system (1) reads and records the monitoring resistance value again.
3. A scale monitoring method of a steam generator according to claim 2, wherein: for each read record of R1, the control system (1) stores and builds a corresponding mathematical model and/or graph.
4. A scale monitoring method of a steam generator according to claim 3, wherein: the graph is drawn by using time T1 and a monitoring resistance value R1, a corresponding change line is drawn between the control system (1) and the last R1 after the control system reads and records new R1, the inclination theta of the change line is calculated, and when the inclination theta is larger than or equal to the set delta theta, the control system (1) prompts that the water quality of the water body is seriously reduced.
5. A scale monitoring method of a steam generator according to claim 1, wherein: the scale monitoring method further comprises a fourth step;
step four, performing a first step of cleaning the substrate,
when R1 is not more than R0, the control system (1) controls the steam generator to not work and sends out a scale cleaning prompt, after a user finishes cleaning the scale, the control system (1) reads the record R1 again, the steam generator is put into operation again after the R1 is more than R0, and if R1 is not more than R0, the control system (1) continues to send out the scale cleaning prompt;
when R1 > R0, the steam generator continues to be put into operation.
6. A scale monitoring method of a steam generator according to claim 1, wherein: in the first step, the non-operation state includes a post-state after the steam generator completes the previous operation and a pre-state before the steam generator performs the next operation.
7. A scale monitoring method of a steam generator according to claim 1, wherein: in the second step, the method for judging the water body emptying in the water storage cavity (3) comprises the following steps: a load dump method, a timed dump method, and a flow dump method;
the steam generator applying the load emptying method comprises a drainage pump (8) connected with a control system (1), wherein the drainage pump (8) is arranged on a drainage waterway (6) communicated with a water storage cavity (3), and the control system (1) monitors the load condition of the drainage pump (8); the load evacuation method comprises the following steps: step a1, the control system (1) executes a drainage task to start the drainage pump (8) and monitor the load condition of the drainage pump (8); step a2, when the drainage pump (8) enters an idle state, the control system (1) finishes a drainage task to close the drainage pump (8) and judges that the water body in the water storage cavity (3) is emptied;
the steam generator applying the timing emptying method comprises a timing module connected with a control system (1), wherein the control system (1) is provided with a drainage time T0; the timed emptying method comprises the following steps: step b1, the control system (1) executes the drainage task and starts the timing module; b2, when the time reading on the timing module reaches T0, the control system (1) finishes the drainage task and judges that the water in the water storage cavity (3) is emptied;
the steam generator applying the flow emptying method comprises a flow meter connected with a control system (1), and the flow meter is arranged on a drainage water path (6) communicated with a water storage cavity (3); the flow evacuation method comprises the following steps: step c1, the control system (1) executes the drainage task and monitors the water flow of the drainage waterway (6) through the flowmeter; and c2, when the reading of the flowmeter is 0, the control system (1) finishes the drainage task and judges that the water body in the water storage cavity (3) is empty.
8. A scale monitoring method of a steam generator according to claim 1, wherein: the end of the liquid probe (4) extends to be close to the metal part (5); or the side part of the liquid probe (4) is arranged close to the metal part (5).
9. A scale monitoring method of a steam generator according to claim 1, wherein: the liquid probe (4) and/or the metal part (5) are made of copper.
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| CN209417312U (en) * | 2019-01-29 | 2019-09-20 | 青岛新欧亚能源有限公司 | A kind of fouling detection circuit for conductive material |
| CN111649477A (en) * | 2020-04-30 | 2020-09-11 | 芜湖美的厨卫电器制造有限公司 | Water heater and water quality detection method thereof |
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2021
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| JP2003326266A (en) * | 2002-05-08 | 2003-11-18 | Kurita Water Ind Ltd | Method and apparatus for producing pure water, and scale monitor |
| JP2005257111A (en) * | 2004-03-09 | 2005-09-22 | Samson Co Ltd | Boiler determining presence or absence of attachment of scale |
| CN206651720U (en) * | 2016-12-27 | 2017-11-21 | 浙江绍兴苏泊尔生活电器有限公司 | Electric kettle |
| CN108918595A (en) * | 2018-04-28 | 2018-11-30 | 芜湖美的厨卫电器制造有限公司 | A kind of water quality detecting device, storage-type electric water heater and water quality detection method |
| CN209417312U (en) * | 2019-01-29 | 2019-09-20 | 青岛新欧亚能源有限公司 | A kind of fouling detection circuit for conductive material |
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