CN113898933B - Cooling method of electrode steam boiler - Google Patents
Cooling method of electrode steam boiler Download PDFInfo
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- CN113898933B CN113898933B CN202111261172.0A CN202111261172A CN113898933B CN 113898933 B CN113898933 B CN 113898933B CN 202111261172 A CN202111261172 A CN 202111261172A CN 113898933 B CN113898933 B CN 113898933B
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- boiler
- cooling
- monitoring point
- temperature
- stage
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- 238000001816 cooling Methods 0.000 title claims abstract description 65
- 238000012544 monitoring process Methods 0.000 claims abstract description 69
- 239000007788 liquid Substances 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 230000001502 supplementing effect Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 13
- 239000000498 cooling water Substances 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 238000010926 purge Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 239000010865 sewage Substances 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
-
- 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
-
- 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
- F22B37/10—Water tubes; Accessories therefor
-
- 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
- F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
- F22B37/47—Applications, arrangements, or dispositions of alarm or automatic safety devices responsive to abnormal temperature, e.g. actuated by fusible plugs
-
- 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
- F22B37/78—Adaptations or mounting of level indicators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
Abstract
The invention relates to the technical field of electrode steam boiler cooling, and provides a cooling method of an electrode steam boiler, which comprises the following steps: determining a temperature monitoring point on the boiler; the boiler is operated under low load, and the temperature of the first stage is reduced; stopping the operation of the boiler, increasing the liquid level of the inner cylinder and the outer cylinder of the boiler, and cooling in the second stage; and supplementing water to the boiler, and cooling in the third stage to reduce the temperature of the temperature monitoring point to a target temperature value. According to the cooling method of the electrode steam boiler, provided by the invention, the cooling of the boiler is divided into a plurality of different stages, and different cooling modes are adopted in each stage, so that the temperature of the boiler is gradually reduced to a target temperature value.
Description
Technical Field
The invention relates to the technical field of electrode steam boiler cooling, in particular to a cooling method of an electrode steam boiler.
Background
The electrode steam boiler heats by using electrodes to generate steam meeting the requirements for users. When the electrode steam boiler fails, the boiler needs to be shut down and the internal temperature of the boiler is reduced to reach the maintenance condition.
The conventional cooling method of the electrode steam boiler mainly comprises natural cooling, and the natural cooling method cannot meet the requirement of rapid overhaul of the boiler due to the low cooling rate of the boiler, so that the availability of the boiler is limited.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is that when the boiler in the prior art is overhauled, a natural cooling method is adopted, the cooling rate is low, the rapid overhauling of the boiler cannot be met, and the availability of the boiler is limited, so that the cooling method of the electrode steam boiler is provided.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the invention provides a cooling method of an electrode steam boiler, which comprises the following steps: determining a temperature monitoring point on the boiler; the boiler is operated under low load, and the temperature of the first stage is reduced; stopping the operation of the boiler, increasing the liquid level of the inner cylinder and the outer cylinder of the boiler, and cooling in the second stage; and supplementing water to the boiler, and cooling in the third stage to reduce the temperature of the temperature monitoring point to a target temperature value.
Further, the determining the temperature monitoring point on the boiler specifically includes: respectively taking the root parts of two guide pipes of the liquid level meter of the inner cylinder of the boiler as a first monitoring point and a second monitoring point; respectively taking the root parts of two guide pipes of the liquid level meter of the outer cylinder of the boiler as a third monitoring point and a fourth monitoring point; selecting a fifth monitoring point and a sixth monitoring point from metal lugs of the boiler, wherein a preset interval is reserved between the fifth monitoring point and the sixth monitoring point; taking the root of a safety valve of the boiler as a seventh monitoring point; taking a boiler water outlet of the boiler as an eighth monitoring point; and taking the root of the electric heater of the boiler as a ninth monitoring point.
Further, the running of the sliding parameters of the boiler, and the cooling in the first stage specifically comprises: the liquid level of the deaerator of the boiler is raised to 88% -90%, and the water temperature of the deaerator is kept between 100 ℃ and 105 ℃.
Further, stopping the operation of the boiler, improving the liquid level of the inner cylinder and the outer cylinder of the boiler, and performing the second-stage cooling specifically comprises the following steps: the liquid volume in the boiler is increased, and the liquid level of the inner cylinder and the outer cylinder is maintained to be between 90 percent and 95 percent; and adjusting the opening and closing degree of a control valve of the air outlet of the boiler to adjust the cooling rate until the temperature of the boiler is reduced to 100 ℃.
Further, the temperature reduction rate of the wall of the boiler is not more than 3 ℃/min.
Further, water is replenished to the boiler, and the cooling of the third stage specifically comprises: cooling water is added into the boiler, and the temperature of the deaerator is gradually reduced; and continuously discharging the sewage from the boiler until the temperatures of the boiler water outlet and the electric heater root of the boiler reach the target temperature value.
Further, the target temperature value ranges from 35 ℃ to 45 ℃.
Further, after the working medium of the boiler is exhausted, if the wall temperature of the boiler rebounds, compressed air is adopted to cool the boiler in the fourth stage.
Further, the cooling in the fourth stage by compressed air specifically includes: and compressed air is introduced from a water outlet pipeline of a boiler water circulation pipeline of the boiler, and forced purging and cooling are carried out.
Further, during the cooling process, the temperature difference between the fifth monitoring point and the sixth monitoring point is kept to be not more than 10 ℃.
The technical scheme of the invention has the following advantages:
according to the cooling method of the electrode steam boiler, provided by the invention, the cooling of the boiler is divided into a plurality of different stages, and different cooling modes are adopted in each stage, so that the temperature of the boiler is gradually reduced to a target temperature value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method of cooling an electrode steam boiler in an embodiment of the present invention;
FIG. 2 is a schematic diagram of temperature monitoring points in an electrode steam boiler in an embodiment of the invention.
Reference numerals illustrate:
1. a first monitoring point; 2. A second monitoring point; 3. A third monitoring point;
4. a fourth monitoring point; 5. A fifth monitoring point; 6. A sixth monitoring point;
7. a seventh monitoring point; 8. An eighth monitoring point; 9. A ninth monitoring point;
10. a boiler.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
FIG. 1 is a flow chart of a method of cooling an electrode steam boiler in an embodiment of the present invention; as shown in fig. 1, the present embodiment provides a cooling method of an electrode steam boiler, including the steps of: the temperature monitoring points on the boiler 10 are determined, and a plurality of temperature monitoring points can be selected on the boiler 10, so that the temperature information of the boiler 10 can be timely obtained during cooling, and corresponding countermeasures can be conveniently taken.
The boiler 10 is operated at a low load so that the temperature and pressure inside the boiler 10 are lowered, and at this time, the temperature of steam inside the boiler 10 is lowered, and the wall temperature of the boiler 10 is also lowered accordingly, and at this time, the temperature of the boiler 10 is lowered in the first stage.
The operation of the boiler 10 is stopped, the liquid level of the inner cylinder and the outer cylinder of the boiler 10 is increased, at the moment, the contact area between the liquid and the boiler 10 can be increased, after the liquid absorbs heat, the liquid is discharged from the air outlet of the boiler 10, the heat of the boiler 10 is taken away, and at the moment, the temperature of the boiler 10 is reduced in the second stage.
The boiler 10 is replenished with water and the temperature of the temperature monitoring point is reduced to the target temperature value by the third stage of temperature reduction. Wherein the target temperature value ranges from 35 c to 45 c, for example, the cooling of the boiler 10 may be stopped when the temperature drops to 40 c.
According to the cooling method for the electrode steam boiler, the boiler 10 is cooled and divided into a plurality of different stages, and different cooling modes are adopted in each stage, so that the temperature of the boiler 10 is gradually reduced to a target temperature value.
Fig. 2 is a schematic diagram of temperature monitoring points in an electrode steam boiler according to an embodiment of the present invention, as shown in fig. 2, wherein determining temperature monitoring points on the boiler 10 specifically includes: respectively taking the root parts of two guide pipes of the liquid level meter in the inner cylinder of the boiler 10 as a first monitoring point 1 and a second monitoring point 2; respectively taking the root parts of two guide pipes of the outer barrel liquid level meter of the boiler 10 as a third monitoring point 3 and a fourth monitoring point 4; selecting a fifth monitoring point 5 and a sixth monitoring point 6 from metal lugs of the boiler 10, wherein a preset interval is reserved between the fifth monitoring point 5 and the sixth monitoring point 6; taking the root of a safety valve of the boiler 10 as a seventh monitoring point 7; taking a water outlet of the boiler 10 as an eighth monitoring point 8; the root of the electric heater of the boiler 10 is used as a ninth monitoring point 9, each monitoring point is provided with a temperature sensor for acquiring temperature information of each monitoring point and feeding the temperature information back to the control room, and the control room can make corresponding measures according to the received temperature information.
Wherein, the running of the sliding parameters of the boiler 10, the cooling of the first stage specifically comprises: the level of the deaerator of the boiler 10 is raised to between 88% -90%, for example, may be maintained at 90%, and the water temperature of the deaerator may be maintained between 100 deg.c and 105 deg.c in advance, so as not to provide sufficient heat to heat the water in the deaerator after low load operation of the boiler 10, thereby affecting the deaeration effect. After the boiler 10 is in the low load operation process, until the pressure of the boiler 10 reaches 0.05MPa, the first cooling stage is ended after the temperature decrease trend of each monitoring point becomes gentle.
Wherein, stop boiler 10 operation, improve the liquid level of the urceolus in the boiler 10, carry out the cooling of second stage specifically includes: increasing the liquid volume within the conditioning boiler 10, maintaining the liquid level of the inner and outer cylinders between 90% -95%, e.g., may be maintained at 95%; at this time, the opening and closing degree of the control valve of the air outlet of the boiler 10 is adjusted to adjust the cooling rate until the temperature of the boiler 10 is lowered to 100 ℃. Wherein, when the cooling rate is too high, the opening and closing degree of the control valve can be reduced to slow down the speed of taking away the heat in the boiler 10 by the steam; when the rate of cooling is too slow, the degree of opening and closing of the control valve can be increased to increase the rate at which the steam takes away heat from the boiler 10.
Wherein the rate of wall temperature reduction of the boiler 10 is maintained at not more than 3 deg.c/min during cooling.
Wherein, carry out the moisturizing to boiler 10, carry out the cooling of third stage specifically includes: cooling water is filled into the boiler 10, the temperature of the cooling water is low, and the temperature of the deaerator can be gradually reduced after the cooling water enters the boiler 10; meanwhile, continuous pollution discharge can be carried out on the boiler 10, wherein the continuous pollution discharge comprises the pollution discharge of the inner cylinder and the outer cylinder and the pollution discharge of the bottom down pipe of the boiler 10, until the temperatures of the boiler water outlet of the boiler 10 and the root of the electric heater reach target temperature values. The temperature of the water outlet of the boiler 10 can be obtained through an eighth monitoring point 8, and the temperature of the root of the electric heater of the boiler 10 can be obtained through a ninth monitoring point 9.
After the working medium of the boiler 10 is exhausted, if the wall temperature of the boiler 10 rebounds, compressed air is adopted to cool in the fourth stage. For example, forced purging cooling may be performed by introducing compressed air from a drain pipe on the boiler water circulation line of the boiler 10.
In the cooling process, the temperature difference between the fifth monitoring point 5 and the sixth monitoring point 6 is kept not to exceed 10 ℃, so that the boiler 10 can be prevented from being deformed due to the fact that the temperature difference between the upper part and the lower part of the boiler 10 is large. Wherein, when the temperature difference between the fifth monitoring point 5 and the sixth monitoring point 6 exceeds 10 ℃, the control valve can be reduced.
In summary, the cooling method of the electrode steam boiler provided by the invention can reduce the metal wall temperature of the boiler 10 from about 100 hours of the conventional cooling time to less than 18 hours, so that the boiler 10 can be in a maintainable state as soon as possible, and the availability of the boiler 10 is improved.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (7)
1. A method for cooling an electrode steam boiler, comprising the steps of:
determining a temperature monitoring point on the boiler;
the boiler is operated under low load, and the temperature of the first stage is reduced;
stopping the operation of the boiler, increasing the liquid level of the inner cylinder and the outer cylinder of the boiler, and cooling in the second stage;
supplementing water to the boiler, and cooling in the third stage to reduce the temperature of the temperature monitoring point to a target temperature value;
the boiler is operated under low load, the liquid level of a deaerator of the boiler is raised to 88-90% before the temperature of the boiler is reduced in the first stage, and the water temperature of the deaerator is kept between 100 ℃ and 105 ℃;
the cooling in the second stage specifically comprises the following steps:
the liquid volume in the boiler is increased, and the liquid level of the inner cylinder and the outer cylinder is maintained to be between 90 percent and 95 percent;
the opening and closing degree of a control valve of a boiler air outlet is regulated to regulate the cooling rate until the temperature of the boiler is reduced to 100 ℃;
supplementing water to the boiler, and cooling in the third stage specifically comprises:
cooling water is added into the boiler, and the temperature of the deaerator is gradually reduced;
and continuously discharging the sewage from the boiler until the temperatures of the boiler water outlet and the electric heater root of the boiler reach the target temperature value.
2. The method for cooling an electrode steam boiler according to claim 1, wherein,
the determining of the temperature monitoring point on the boiler specifically comprises the following steps:
respectively taking the root parts of two guide pipes of the liquid level meter of the inner cylinder of the boiler as a first monitoring point and a second monitoring point;
respectively taking the root parts of two guide pipes of the liquid level meter of the outer cylinder of the boiler as a third monitoring point and a fourth monitoring point;
selecting a fifth monitoring point and a sixth monitoring point from metal lugs of the boiler, wherein a preset interval is reserved between the fifth monitoring point and the sixth monitoring point;
taking the root of a safety valve of the boiler as a seventh monitoring point;
taking a boiler water outlet of the boiler as an eighth monitoring point;
and taking the root of the electric heater of the boiler as a ninth monitoring point.
3. The method for cooling an electrode steam boiler according to claim 1, wherein,
the temperature reduction rate of the wall of the boiler is not more than 3 ℃/min.
4. The method for cooling an electrode steam boiler according to claim 1, wherein,
the target temperature value ranges from 35 ℃ to 45 ℃.
5. The method for cooling an electrode steam boiler according to claim 1, wherein,
after the working medium of the boiler is exhausted, if the wall temperature of the boiler rebounds, compressed air is adopted to cool the boiler in the fourth stage.
6. The method for cooling an electrode steam boiler according to claim 5,
the adoption compressed air, carry out the cooling of fourth stage specifically includes:
and compressed air is introduced from a water outlet pipeline of a boiler water circulation pipeline of the boiler, and forced purging and cooling are carried out.
7. The method for cooling an electrode steam boiler according to claim 2, wherein,
in the cooling process, the temperature difference between the fifth monitoring point and the sixth monitoring point is kept to be not more than 10 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111261172.0A CN113898933B (en) | 2021-10-27 | 2021-10-27 | Cooling method of electrode steam boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111261172.0A CN113898933B (en) | 2021-10-27 | 2021-10-27 | Cooling method of electrode steam boiler |
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| CN113898933A CN113898933A (en) | 2022-01-07 |
| CN113898933B true CN113898933B (en) | 2023-11-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1080704A (en) * | 1993-05-15 | 1994-01-12 | 东方锅炉厂 | Boiler-steam dome quick cooling monitoring, control system and method |
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2021
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| CN113898933A (en) | 2022-01-07 |
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