CN114135857A - Method for controlling flow of desuperheating water of low-load section superheater of boiler - Google Patents
Method for controlling flow of desuperheating water of low-load section superheater of boiler Download PDFInfo
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- CN114135857A CN114135857A CN202110728202.8A CN202110728202A CN114135857A CN 114135857 A CN114135857 A CN 114135857A CN 202110728202 A CN202110728202 A CN 202110728202A CN 114135857 A CN114135857 A CN 114135857A
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- 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
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
- F22D5/34—Applications of valves
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- 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
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention relates to the technical field of boilers and discloses a method for controlling the flow of desuperheating water of a low-load section superheater of a boiler, which comprises the following steps: the method comprises the following steps: adding a low-temperature section boiler and a high-temperature section boiler, preheating water in the low-temperature section boiler and the high-temperature section boiler, wherein outlet ends of the low-temperature section boiler and the high-temperature section boiler are respectively and commonly connected with two inlet ends of a three-way head through first pipelines, the other outlet end of the three-way head is connected with a main boiler, the outlet end of the main boiler is connected with the inlet end of a superheater through a second pipeline, and water pumps are respectively arranged on the two first pipelines; step two: the steam temperature in the superheater is monitored through a temperature monitor, and a standard temperature value section is set for the steam in the superheater according to production requirements. The method for controlling the flow of the desuperheating water of the superheater at the low-load section of the boiler can reduce the time required for temperature adjustment and improve the working efficiency of the boiler.
Description
Technical Field
The invention relates to the technical field of boilers, in particular to a method for controlling the flow of desuperheating water of a superheater at a low-load section of a boiler.
Background
The steam temperature of the boiler is one of the most important parameters influencing the safety and the economical efficiency of the production process of the boiler, overhigh temperature of superheated steam causes overhigh metal temperature and creep expansion enhancement, the service life of a pipeline is shortened, and overtemperature pipe explosion of a superheater pipeline can be caused frequently. The heat efficiency of the whole plant can be reduced when the temperature of the superheated steam is too low, and the heat efficiency is reduced by 1 percent when the temperature of the superheater steam is reduced by 5-10 ℃. The operating regulations require that the control of the superheated steam temperature not exceed-10 to 5 ℃ of the nominal value (set point). The steam temperature control object has the characteristics of large inertia, large lag, nonlinearity and strong coupling, and in addition, factors influencing the steam temperature are many, such as boiler load, fuel quantity, flue gas disturbance (powder making during start and stop), temperature-reducing water quantity (water supply pressure) and the like.
The retrieval publication (announcement) number CN107463739B discloses a desuperheating water flow analysis method and a desuperheating water flow analysis device, when the method is used, a quantitative relation between steam temperature deviation and desuperheating water flow is established, correction analysis of desuperheating water flow is realized, and the influence of flue gas side steam temperature regulation operation on unit operation economy is quantitatively evaluated by using a uniform index;
the numerical values of the high-pressure bypass steam leakage amount and the high-pressure bypass desuperheating water flow amount of the steam turbine generator unit are calculated in a mode of combining site measurement and theoretical calculation, so that the influence value of the high-bypass steam leakage amount and the high-bypass desuperheating water investment on the unit operation economy can be specifically analyzed, and the heat consumption rate of the unit during operation is accurately calculated.
The above scheme still has the following technical defects:
at present, when steam in the superheater is adjusted, the temperature of the steam after temperature reduction is adjusted only by simply controlling the water quantity of the temperature reduction water, but when the method is used for greatly adjusting the steam temperature of the boiler, the required time is long, and the working efficiency of the boiler is reduced.
Disclosure of Invention
Technical scheme (I)
In order to achieve the purposes of reducing the time required by temperature adjustment and improving the working efficiency of the boiler, the invention provides the following technical scheme: a method for controlling the flow of desuperheating water of a low-load section superheater of a boiler comprises the following steps:
the method comprises the following steps: adding a low-temperature section boiler and a high-temperature section boiler, preheating water in the low-temperature section boiler and the high-temperature section boiler, wherein outlet ends of the low-temperature section boiler and the high-temperature section boiler are respectively and commonly connected with two inlet ends of a three-way head through first pipelines, the other outlet end of the three-way head is connected with a main boiler, the outlet end of the main boiler is connected with the inlet end of a superheater through a second pipeline, and water pumps are respectively arranged on the two first pipelines;
step two: monitoring the temperature of steam in the superheater through a temperature monitor, and setting a standard temperature value section for the steam in the superheater according to production requirements;
step three: when the temperature of steam in the superheater exceeds a standard temperature value section, starting a water pump in a first pipeline connected with the low-temperature section boiler, transporting water in the low-temperature section boiler into a main boiler, and quickly cooling water in the main boiler;
step four: when the temperature of steam in the superheater is lower than a standard temperature value section, a water pump in a first pipeline connected with the high-temperature section boiler is started, water in the high-temperature section boiler is transported to the main boiler, and the water in the main boiler is rapidly heated.
Preferably, two all install the check valve in the first pipeline, the output of check valve is close to main boiler setting.
Preferably, the second pipeline is provided with a control valve.
Preferably, the low-temperature section boiler and the high-temperature section boiler are both provided with water circulation devices, and generated water vapor is condensed and then sent back.
Preferably, the main boiler is connected with a water replenishing port and a temperature detector.
Preferably, the low-temperature section boiler and the high-temperature section boiler are both provided with water inlets.
Preferably, a filtering device for filtering water is installed in each of the water replenishing port and the water inlet.
(II) advantageous effects
Compared with the prior art, the invention provides a method for controlling the flow of desuperheating water of a low-load section superheater of a boiler, which has the following beneficial effects:
according to the control method for the desuperheating water flow of the superheater of the low-load section of the boiler, the low-temperature section boiler and the high-temperature section boiler are additionally arranged, when the steam temperature in the superheater exceeds a standard temperature value section, water in the low-temperature section boiler or the high-temperature section boiler is transported to the main boiler, the water in the main boiler is rapidly heated, the steam temperature after desuperheating is not simply adjusted by controlling the water quantity of the desuperheating water, the time required by temperature adjustment is shortened, and the working efficiency of the boiler is improved.
Drawings
FIG. 1 is a schematic structural diagram of a method for controlling the flow rate of desuperheated water of a low-load section superheater of a boiler.
In the figure: 1 low-temperature section boiler, 2 high-temperature section boiler, 3 first pipeline, 4 tee joints, 5 main boiler, 6 second pipeline, 7 superheater, 8 water pump, 9 temperature monitor, 10 control valve, 11 moisturizing mouth, 12 thermodetector, 13 water inlets, 14 check valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a method for controlling the desuperheating water flow rate of a low-load section superheater of a boiler comprises the following steps:
the method comprises the following steps: the method comprises the following steps that a low-temperature section boiler 1 and a high-temperature section boiler 2 are additionally arranged to preheat the inner water, the outlet ends of the low-temperature section boiler 1 and the high-temperature section boiler 2 are respectively and jointly connected with two inlet ends of a three-way head 4 through first pipelines 3, the other outlet end of the three-way head 4 is connected with a main boiler 5, the outlet end of the main boiler 5 is connected with the inlet end of a superheater 7 through a second pipeline 6, and water pumps 8 are respectively installed on the two first pipelines 3;
step two: monitoring the temperature of steam in the superheater 7 through a temperature monitor 9, and setting a standard temperature value section for the steam in the superheater 7 according to production requirements;
step three: when the temperature of steam in the superheater 7 exceeds a standard temperature value section, starting a water pump 8 in a first pipeline 3 connected with the low-temperature section boiler 1, transporting water in the low-temperature section boiler 1 to a main boiler 5, and quickly cooling water in the main boiler 5;
step four: when the temperature of steam in the superheater 7 is lower than a standard temperature value section, starting a water pump 8 in a first pipeline 3 connected with the high-temperature section boiler 2, transporting water in the high-temperature section boiler 2 to the main boiler 5, and rapidly heating the water in the main boiler 5;
the low-temperature section boiler 1 and the high-temperature section boiler 2 are additionally arranged, the low-temperature section boiler 1 and the high-temperature section boiler 2 preheat internal water, the temperature monitor 9 monitors that the temperature of steam in the superheater 7 is abnormal, and when the temperature of the steam in the superheater 7 exceeds a standard temperature value section, the water in the low-temperature section boiler 1 is transported to the main boiler 5, and the water in the main boiler 5 is rapidly cooled; otherwise, the water in the high-temperature section boiler 2 is transported to the main boiler 5, the water in the main boiler 5 is rapidly heated, the temperature of the steam after temperature reduction is not simply adjusted by controlling the water quantity of the temperature reduction water, the time required for temperature adjustment is reduced, and the working efficiency of the boiler is improved.
All install check valve 14 in two first pipelines 3, the output of check valve 14 is close to main boiler 5 and sets up for water can only one-way flow in first pipeline 3, prevents that water from getting into low temperature section boiler 1 and high temperature section boiler 2 in the main boiler 5.
The second pipe 6 is provided with a control valve 10 for controlling the opening and closing of the second pipe 6.
All be equipped with water circle device on low temperature section boiler 1 and the high temperature section boiler 2, send back after condensing the vapor that will produce, carry out reuse to the water resource.
The main boiler 5 is connected with a water replenishing port 11 and a temperature detector 12, the main boiler 5 is replenished with water through the water replenishing port 11, and the temperature detector 12 monitors the temperature in the main boiler 5.
And water inlets 13 are respectively arranged on the low-temperature section boiler 1 and the high-temperature section boiler 2, and water is supplemented into the low-temperature section boiler 1 and the high-temperature section boiler 2 through the water inlets 13.
And filtering equipment for filtering water is arranged in the water replenishing port 12 and the water inlet 13, and water entering the low-temperature section boiler 1, the high-temperature section boiler 2 and the main boiler 5 is filtered.
In conclusion, according to the method for controlling the flow of the desuperheating water of the low-load section superheater of the boiler, the low-temperature section boiler 1 and the high-temperature section boiler 2 are additionally arranged, the low-temperature section boiler 1 and the high-temperature section boiler 2 preheat the internal water, the temperature monitor 9 monitors that the temperature of the steam in the superheater 7 is abnormal, when the temperature of the steam in the superheater 7 exceeds a standard temperature value section, the water in the low-temperature section boiler 1 is transported to the main boiler 5, and the water in the main boiler 5 is rapidly cooled; otherwise, the water in the high-temperature section boiler 2 is transported to the main boiler 5, the water in the main boiler 5 is rapidly heated, the temperature of the steam after temperature reduction is not simply adjusted by controlling the water quantity of the temperature reduction water, the time required for temperature adjustment is reduced, and the working efficiency of the boiler is improved.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A method for controlling the flow of desuperheating water of a superheater of a low-load section of a boiler is characterized by comprising the following steps of:
the method comprises the following steps: the method comprises the following steps that a low-temperature section boiler (1) and a high-temperature section boiler (2) are additionally arranged, water in the low-temperature section boiler (1) and the high-temperature section boiler (2) is preheated, the outlet ends of the low-temperature section boiler (1) and the high-temperature section boiler (2) are respectively and jointly connected with two inlet ends of a three-way head (4) through first pipelines (3), the other outlet end of the three-way head (4) is connected with a main boiler (5), the outlet end of the main boiler (5) is connected with the inlet end of a superheater (7) through a second pipeline (6), and water pumps (8) are respectively installed on the two first pipelines (3);
step two: monitoring the steam temperature in the superheater (7) through a temperature monitor (9), and setting a standard temperature value section for the steam in the superheater (7) according to production requirements;
step three: when the steam temperature in the superheater (7) exceeds a standard temperature value section, starting a water pump (8) in a first pipeline (3) connected with the low-temperature section boiler (1), transporting water in the low-temperature section boiler (1) to a main boiler (5), and quickly cooling water in the main boiler (5);
step four: when the steam temperature in the superheater (7) is lower than the standard temperature value section, a water pump (8) in a first pipeline (3) connected with the high-temperature section boiler (2) is started, water in the high-temperature section boiler (2) is transported to the main boiler (5), and the water in the main boiler (5) is rapidly heated.
2. The method for controlling the flow of the desuperheating water of the low-load section superheater of the boiler according to claim 1, characterized in that: two all install check valve (14) in first pipeline (3), the output of check valve (14) is close to main boiler (5) and sets up.
3. The method for controlling the flow of the desuperheating water of the low-load section superheater of the boiler according to claim 1, characterized in that: and a control valve (10) is arranged on the second pipeline (6).
4. The method for controlling the flow of the desuperheating water of the low-load section superheater of the boiler according to claim 1, characterized in that: and water circulating devices are arranged on the low-temperature section boiler (1) and the high-temperature section boiler (2) respectively, and generated water vapor is condensed and then sent back.
5. The method for controlling the flow of the desuperheating water of the low-load section superheater of the boiler according to claim 1, characterized in that: the main boiler (5) is connected with a water replenishing port (11) and a temperature detector (12).
6. The method for controlling the flow of the desuperheating water of the low-load section superheater of the boiler according to claim 1, characterized in that: and water inlets (13) are respectively arranged on the low-temperature section boiler (1) and the high-temperature section boiler (2).
7. The method for controlling the flow rate of the desuperheater water of the low-load section superheater of the boiler according to claim 5 or 6, wherein the method comprises the following steps: and filtering equipment for filtering water is arranged in the water replenishing port (12) and the water inlet (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110728202.8A CN114135857A (en) | 2021-06-29 | 2021-06-29 | Method for controlling flow of desuperheating water of low-load section superheater of boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110728202.8A CN114135857A (en) | 2021-06-29 | 2021-06-29 | Method for controlling flow of desuperheating water of low-load section superheater of boiler |
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| CN114135857A true CN114135857A (en) | 2022-03-04 |
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| CN202110728202.8A Pending CN114135857A (en) | 2021-06-29 | 2021-06-29 | Method for controlling flow of desuperheating water of low-load section superheater of boiler |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4498301A (en) * | 1982-02-17 | 1985-02-12 | Hitachi, Ltd. | Cooling device of steam turbine |
| CN101183253A (en) * | 2007-11-21 | 2008-05-21 | 中油特种车辆有限公司 | Paraffin removing vehicle automatic control method |
| CN101493289A (en) * | 2009-02-14 | 2009-07-29 | 济宁碳素工业总公司 | Residual heat comprehensive utilization method for carbon calciner |
| CN102562191A (en) * | 2010-10-22 | 2012-07-11 | 株式会社东芝 | Carbon dioxide recovery method and carbon-dioxide-recovery-type steam power generation system |
| CN105804810A (en) * | 2016-03-11 | 2016-07-27 | 大唐淮南洛河发电厂 | Operation control method for thermal power generating unit |
| CN107620947A (en) * | 2017-08-28 | 2018-01-23 | 浙江海洋大学 | A kind of desuperheating water of superheater water system |
-
2021
- 2021-06-29 CN CN202110728202.8A patent/CN114135857A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4498301A (en) * | 1982-02-17 | 1985-02-12 | Hitachi, Ltd. | Cooling device of steam turbine |
| CN101183253A (en) * | 2007-11-21 | 2008-05-21 | 中油特种车辆有限公司 | Paraffin removing vehicle automatic control method |
| CN101493289A (en) * | 2009-02-14 | 2009-07-29 | 济宁碳素工业总公司 | Residual heat comprehensive utilization method for carbon calciner |
| CN102562191A (en) * | 2010-10-22 | 2012-07-11 | 株式会社东芝 | Carbon dioxide recovery method and carbon-dioxide-recovery-type steam power generation system |
| CN105804810A (en) * | 2016-03-11 | 2016-07-27 | 大唐淮南洛河发电厂 | Operation control method for thermal power generating unit |
| CN107620947A (en) * | 2017-08-28 | 2018-01-23 | 浙江海洋大学 | A kind of desuperheating water of superheater water system |
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