CN111561692A - System for correcting reheater steam temperature deviation of tower furnace and deviation correcting method thereof - Google Patents
System for correcting reheater steam temperature deviation of tower furnace and deviation correcting method thereof Download PDFInfo
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- CN111561692A CN111561692A CN202010389789.XA CN202010389789A CN111561692A CN 111561692 A CN111561692 A CN 111561692A CN 202010389789 A CN202010389789 A CN 202010389789A CN 111561692 A CN111561692 A CN 111561692A
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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
- F22B37/42—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
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Abstract
The invention relates to a system and a method for correcting reheater steam temperature deviation of a tower furnace, and belongs to the technical field of reheater steam temperature deviation correction. The system for correcting the steam temperature deviation of the reheater of the tower furnace and the correction method thereof utilize the steam extraction of the steam-driven draught fan to correct the steam temperature of the reheated steam, cancel the original throttling ring, use direct connection instead, and eliminate the steam temperature deviation of the tower furnace by the method of structure and system optimization.
Description
Technical Field
The invention relates to a system and a method for correcting reheater steam temperature deviation of a tower furnace, and belongs to the technical field of reheater steam temperature deviation correction.
Background
Due to the superposed influence of various factors such as structure, combustion adjustment and the like, the steam temperature deviation of the tower type furnace reheater in the power plant is large, and the possibility of overtemperature tube explosion of the boiler reheater exists. In conclusion, the existing tower furnace reheater has the possibility of overtemperature tube explosion.
At present, a power plant carries out steam-driven draught fan transformation, a steam source of the steam-driven draught fan is mixed by steam extraction at an inlet and an outlet of a primary reheater of a boiler and then is sent into a small steam turbine of the draught fan to serve as driving energy, the steam extraction amount is about 1/10 reheater flow, 4 connecting pipes are arranged at an outlet of the primary reheater to serve as a secondary reheater, the steam extraction design is that a head is extracted at an outlet of each pipe to serve as a mixer, and therefore the 4 steam extraction pipe flows are basically consistent, and the steam temperature correction of the reheater is not affected.
In view of the defects, the designer actively makes research and innovation, and can utilize the method to correct the deviation in the transformation by combining the transformation condition of the steam-driven induced draft fan of the tower furnace.
Disclosure of Invention
In order to solve the technical problems, the invention aims to eliminate the inherent defect of large steam temperature deviation of a tower type furnace reheater and improve the safety of equipment when a steam-driven draught fan is modified in a boiler. A system for correcting reheater steam temperature deviation of tower furnace and its correcting method are disclosed.
The invention relates to a system for correcting reheater steam temperature deviation of a tower furnace, which comprises a primary reheater, a secondary reheater, a first steam-driven draught fan and a second steam-driven draught fan,
one-level re-heater inlet end connection has a low temperature to reheat and comes with No. two low temperatures to reheat, reheat at a low temperature and come the exit end and be connected with the accent door No. one, reheat at No. two low temperatures and come the exit end and be connected with No. two accent doors, it comes to be connected with No. one-level re-heater export at one-level re-heater exit end, No. two one-level re-heater exports, No. three one-level re-heater exports and comes with No. four one-level re-heater exports, a steam-driven draught fan and No. two steam-driven draught fans that are parallelly connected each other are connected.
A method for correcting reheater steam temperature deviation of a tower furnace comprises the following specific correction steps:
(1) starting a first steam-driven draught fan and a second steam-driven draught fan to extract steam as driving energy;
(2) the deviation of the steam temperature at the outlet end of the secondary reheater is adjusted through a first adjusting door and a second adjusting door arranged at the inlet of the primary reheater.
Further, the step of adjusting the deviation of the outlet end steam temperature of the secondary reheater through a first adjusting door and a second adjusting door arranged at the inlet of the primary reheater is as follows:
when the temperature of the outlet from the first-stage reheater outlet and the second-stage reheater outlet which are connected in parallel is higher than the temperature of the outlet from the third-stage reheater outlet and the fourth-stage reheater outlet which are connected in parallel, the flow of steam from the second low-temperature reheating is reduced by closing the second throttle, thereby improving the temperature of the steam at the outlet of the first reheater in parallel connection with the steam at the outlet of the fourth reheater in parallel connection, keeping the total flow of the steam extracted by the first steam-driven draught fan and the second steam-driven draught fan unchanged, since the steam flow rate from the second low-temperature reheating is reduced, the steam flow rate from the first low-temperature reheating is increased, therefore, the outlet temperature of the first-stage reheater outlet connected in parallel and the outlet temperature of the second-stage reheater outlet connected in parallel and the outlet temperature of the third-stage reheater outlet connected in parallel and the outlet temperature of the fourth-stage reheater outlet are reduced.
Further, the primary reheater and the secondary reheater are connected in series.
Further, the first low-temperature reheating device and the second low-temperature reheating device are connected in parallel.
Furthermore, the first low-temperature reheating inlet, the first-stage reheater outlet and the second-stage reheater outlet are connected in parallel, and the second low-temperature reheating inlet, the third-stage reheater outlet and the fourth-stage reheater outlet are connected in parallel.
Furthermore, the first-stage reheater outlet, the second-stage reheater outlet, the third-stage reheater outlet and the fourth-stage reheater outlet are connected with the outlet end of the second-stage reheater.
Furthermore, a steam-driven draught fan and a steam-driven draught fan which are connected in parallel are provided with two steam source inlets, one of the steam source inlets is connected with a common outlet end which is connected with a low-temperature reheating inlet, a first-stage reheater outlet and a second-stage reheater outlet, and the outlet end of the other steam source inlet is directly connected with the outlet end of the first-stage reheater.
By the scheme, the invention at least has the following advantages:
the system for correcting the steam temperature deviation of the reheater of the tower furnace and the correction method thereof utilize the steam extraction of the steam-driven draught fan to correct the steam temperature of the reheated steam, cancel the original throttling ring, use direct connection instead, and eliminate the steam temperature deviation of the tower furnace by the method of structure and system optimization.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate a certain embodiment of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of a system for correcting reheater steam temperature deviation in a tower furnace according to the present invention;
wherein, in the figure, 1 is a primary reheater; 2. a secondary reheater; 3. low-temperature reheating; 4. second low-temperature reheating; 5. a first gate; 6. a second gate; 7. a first reheater outlet; 8. a second primary reheater outlet; 9. a third stage reheater outlet; 10. a fourth stage reheater outlet; 11. a first steam-driven draught fan; 12. and a second steam-driven draught fan.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1, a system for correcting reheater steam temperature deviation in a tower furnace according to a preferred embodiment of the present invention includes a primary reheater 1, a secondary reheater 2, a first steam-driven induced draft fan 11, and a second steam-driven induced draft fan 12, where the primary reheater 1 and the secondary reheater 2 are connected in series.
The inlet end of the first-stage reheater 1 is connected with a first low-temperature reheating inlet 3 and a second low-temperature reheating inlet 4 which are connected in parallel, the first low-temperature reheating inlet 3 is connected with a first throttle 5 in series, the second low-temperature reheating inlet 4 is connected with a second throttle 6 in series, the outlet end of the first-stage reheater 1 is connected with a first-stage reheater outlet 7, a second-stage reheater outlet 8, a third-stage reheater outlet 9 and a fourth-stage reheater outlet 10, the first-stage reheater outlet 7, the second-stage reheater outlet 8, the third-stage reheater outlet 9 and the fourth-stage reheater outlet 10 are connected with the outlet end of the second-stage reheater 2. The first low-temperature reheating inlet 3, the first-stage reheater outlet 7, the second-stage reheater outlet 8 are connected in parallel, the second low-temperature reheating inlet 4, the third-stage reheater outlet 9 and the fourth-stage reheater outlet 10 are connected in parallel. A first steam-driven draught fan 11 and a second steam-driven draught fan 12 which are connected in parallel are connected with the inlet end and the outlet end of the primary reheater 1. Steam-driven draught fan 11 and No. two steam-driven draught fan 12 that connect in parallel each other have two steam source imports in total, and one of them steam source import and a low temperature that connects in parallel each other are reheated and come 3, No. one grade reheater export comes 7, No. two grade reheater exports the common exit end that comes 8 and connect, and another steam source import and the exit end lug connection of one-level reheater 1.
The invention relates to a method for correcting reheater steam temperature deviation by a tower furnace, which comprises the following specific correction steps:
1, starting a first steam-driven draught fan 11 and a second steam-driven draught fan 12 to extract steam as driving energy;
2, the deviation of the steam temperature at the outlet end of the secondary reheater 2 is adjusted through a first adjusting door 5 and a second adjusting door 6 arranged at the inlet of the primary reheater 1.
The boiler reheater system is divided into a left system and a right system, the steam extraction system of the steam-driven draught fan can be regarded as a bypass of a primary reheater, the deviation of the steam temperature of the outlet of a secondary reheater is adjusted by two regulating valves of the inlet of the primary reheater corresponding to the outlet of the primary reheater connected in parallel at one side respectively, the effect of adding a throttling ring is obvious compared with the effect of adding a throttling ring by using the pipeline of the primary reheater to remove the steam-driven draught fan, and the regulating range is large.
For example, when the outlet temperature of the outlet 7 from the first-stage reheater outlet and the outlet 8 from the second-stage reheater outlet which are connected in parallel is higher than the outlet temperature of the outlet 9 from the third-stage reheater outlet and the outlet 10 from the fourth-stage reheater outlet which are connected in parallel, the steam flow of the second-stage low-temperature reheater outlet 4 is reduced by closing the second damper 6, because the inlet temperature of the first-stage reheater is lower and can serve as a refrigerant compared with the outlet temperature, the steam flow of the second-stage low-temperature reheater outlet 4 is reduced to be equivalent to the reduction of the refrigerant flow of the second-stage low-temperature reheater outlet 4, so that the outlet steam temperatures of the third-stage reheater outlet 9 and the fourth-stage reheater outlet 10 which are connected in parallel are increased, the total steam flow of the first steam-driven induced draft fan 11 and the second steam-driven induced draft fan 12 is unchanged, the steam flow is about 1/10 reheater flow, and the, therefore, the steam flow of the first-stage reheater outlet 3 is increased, the outlet temperature of the third-stage reheater outlet 9 and the outlet temperature of the fourth-stage reheater outlet 10 which are connected in parallel are reduced, the purpose of balancing the outlet steam temperature of the first-stage reheater outlet 7 and the outlet steam temperature of the second-stage reheater outlet 8 which are connected in parallel and the outlet steam temperature of the third-stage reheater outlet 9 and the outlet steam temperature of the fourth-stage reheater outlet 10 which are connected in parallel is achieved, if the temperature is too high, the steam temperature is reduced through combustion regulation, if the temperature is not high enough, the steam temperature can be improved through combustion regulation, the regulation is more flexible than that of a traditional fixed throttle ring, the regulation range is larger, and the thermal deviation of two sides of the reheater outlet after regulation is not more than 20.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The utility model provides a tower stove corrects reheater steam temperature deviation system, includes one-level reheater (1), second grade reheater (2) and a steam-driven draught fan (11) and No. two steam-driven draught fans (12), its characterized in that:
one-level re-heater (1) entrance connection has one low temperature to reheat and come (3) and No. two low temperatures to reheat and come (4), reheat at a low temperature and come (3) exit end and be connected with a pitch gate (5), reheat at No. two low temperatures and come (4) exit end and be connected with No. two pitch gates (6), it comes (7) to be connected with one-level re-heater export at one-level re-heater (1) exit end, one-level re-heater export does not two (8), No. three one-level re-heater exports (9) and one-level re-heater export does not four (10), a steam-operated draught fan (11) and No. two steam-operated draught fans (12) that are parallelly connected each other are connected with the entrance point and the exit end of one-level re-.
2. A method for correcting reheater steam temperature deviation of a tower furnace is characterized in that: the concrete correction steps are as follows:
(1) starting a first steam-driven draught fan (11) and a second steam-driven draught fan (12) to extract steam as driving energy;
(2) the deviation of the steam temperature at the outlet end of the secondary reheater (2) is adjusted through a first adjusting door (5) and a second adjusting door (6) arranged at the inlet of the primary reheater (1).
3. The method for correcting the reheater steam temperature deviation of the tower furnace as claimed in claim 2, wherein: the step of adjusting the deviation of the steam temperature of the outlet end of the secondary reheater (2) through a first adjusting door (5) and a second adjusting door (6) arranged at the inlet of the primary reheater (1) is as follows:
when the outlet temperature of the outlet (7) of the first-stage reheater and the outlet (8) of the second-stage reheater which are connected in parallel is higher than the outlet temperature of the outlet (9) of the third-stage reheater and the outlet (10) of the fourth-stage reheater which are connected in parallel, the steam flow of the second-stage low-temperature reheater (4) is reduced by closing the second-stage damper (6), so that the outlet steam temperature of the outlet (9) of the third-stage reheater and the outlet (10) of the fourth-stage reheater which are connected in parallel is improved, the total flow of the steam extracted by the first steam-driven induced draft fan (11) and the second steam-driven induced draft fan (12) is unchanged, and the steam flow of the second-stage low-temperature reheater (4) is reduced, so that the steam flow of the first-stage low-temperature reheater (3) is increased, so that the outlet temperature of the third-stage reheater (9) and the outlet (10) of the fourth-stage reheater which, the purpose of balancing the outlet steam temperature from the first-stage reheater outlet (7) and the second-stage reheater outlet (8) which are connected in parallel with the outlet steam temperature from the third-stage reheater outlet (9) and the fourth-stage reheater outlet (10) which are connected in parallel is achieved.
4. The system of claim 1 for correcting reheater steam temperature deviation, wherein: the primary reheater (1) and the secondary reheater (2) are connected in series.
5. The system of claim 1 for correcting reheater steam temperature deviation, wherein: the first low-temperature reheating device (3) and the second low-temperature reheating device (4) are connected in parallel.
6. The system of claim 1 for correcting reheater steam temperature deviation, wherein: the first-stage low-temperature reheating inlet (3), the first-stage reheater outlet (7), the second-stage reheater outlet (8) are connected in parallel, the second-stage low-temperature reheating inlet (4), the third-stage reheater outlet (9) and the fourth-stage reheater outlet (10) are connected in parallel.
7. The system of claim 1 for correcting reheater steam temperature deviation, wherein: the first-stage reheater outlet (7), the second-stage reheater outlet (8), the third-stage reheater outlet (9) and the fourth-stage reheater outlet (10) are connected with the outlet end of the second-stage reheater (2).
8. The system of claim 1 for correcting reheater steam temperature deviation, wherein: steam-driven draught fan (11) and No. two steam-driven draught fan (12) that connect in parallel each other total two steam source import, one of them steam source import and low temperature that connect in parallel each other are reheated and are come (3), a one-level reheater export comes (7), No. two one-level reheater exports the common exit end connection that comes (8), the exit end lug connection of another steam source import and one-level reheater (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010389789.XA CN111561692A (en) | 2020-05-11 | 2020-05-11 | System for correcting reheater steam temperature deviation of tower furnace and deviation correcting method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010389789.XA CN111561692A (en) | 2020-05-11 | 2020-05-11 | System for correcting reheater steam temperature deviation of tower furnace and deviation correcting method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6026653A (en) * | 1997-05-13 | 2000-02-22 | Presnell; David M. | Marine air conditioner |
| CN206972325U (en) * | 2017-07-13 | 2018-02-06 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of small turbine vapour source automatically switches and regulating system |
| CN108087049A (en) * | 2017-12-31 | 2018-05-29 | 联合瑞升（北京）科技有限公司 | A kind of industry steam-supplying system |
| CN207701182U (en) * | 2017-12-15 | 2018-08-07 | 淮浙煤电有限责任公司凤台发电分公司 | A kind of cold main pipe of vapour source again header system |
-
2020
- 2020-05-11 CN CN202010389789.XA patent/CN111561692A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6026653A (en) * | 1997-05-13 | 2000-02-22 | Presnell; David M. | Marine air conditioner |
| CN206972325U (en) * | 2017-07-13 | 2018-02-06 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of small turbine vapour source automatically switches and regulating system |
| CN207701182U (en) * | 2017-12-15 | 2018-08-07 | 淮浙煤电有限责任公司凤台发电分公司 | A kind of cold main pipe of vapour source again header system |
| CN108087049A (en) * | 2017-12-31 | 2018-05-29 | 联合瑞升（北京）科技有限公司 | A kind of industry steam-supplying system |
Non-Patent Citations (1)
| Title |
|---|
| 马新立: ""抽汽背压式汽动引风机改造技术及调试优化"", 《2013年中国电机工程学会年会论文集》 * |
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Application publication date: 20200821 |
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