CN210165362U - Temperature-reducing adjusting system for adjusting temperature of reheat steam of reheat boiler - Google Patents
Temperature-reducing adjusting system for adjusting temperature of reheat steam of reheat boiler Download PDFInfo
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- CN210165362U CN210165362U CN201921063191.0U CN201921063191U CN210165362U CN 210165362 U CN210165362 U CN 210165362U CN 201921063191 U CN201921063191 U CN 201921063191U CN 210165362 U CN210165362 U CN 210165362U
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Abstract
The utility model provides an adjust reheat boiler reheat steam temperature's temperature reduction governing system, including boiler steam turbine input, one-level desuperheater, low temperature reheater, second grade desuperheater, high temperature reheater, boiler steam turbine output that communicate in proper order, the low temperature reheater is equipped with entry collection case and export collection case, the low temperature reheater outside is equipped with the pipeline, the utility model discloses a mode of collection case additional equipment bypass pipeline is imported and exported at the low temperature reheater, combines the reheater two-stage desuperheater water spray attemperation to reach the purpose of adjusting reheat steam temperature, has solved the problem that small capacity high temperature ultra-high pressure gas boiler can't install afterbody flue gas baffle in order to adjust reheat steam temperature.
Description
Technical Field
The utility model relates to a heat energy power field, a concretely designs temperature-reducing control system who adjusts reheat steam temperature of reheat boiler.
Background
Due to the characteristic of large fluctuation of the heat value of coal gas, the high-temperature ultrahigh-pressure coal gas boiler has large fluctuation of the flue gas temperature of the boiler, so that the temperature fluctuation of reheat steam is large. The method is characterized in that a flue gas volume passing through a boiler reheater is adjusted by generally adopting a mode that a flue gate is arranged on a tail flue, so that the temperature of reheated steam is adjusted to prevent the reheated steam from being over-heated, and the reheater two-stage desuperheater is combined to spray water for desuperheating to prevent the reheated steam from being over-heated in an accident state so as to protect the normal operation of a unit. However, for high-temperature and ultrahigh-pressure gas boilers of 130t/h and below, because the capacity of the boiler is small, the tail flue is narrow and is only about 3000mm, if the boiler is set to be a double flue, the width of each flue is only 1500mm, flue gas corridors and other hazards are easily generated after the heating surface is arranged, the installation and the maintenance are inconvenient, and the capacity boiler is determined to be not suitable for being provided with the double flue and the flue gas baffle door through technical examination and research. However, if the reheater only adopts the water spray attemperation mode to prevent the reheated steam from being over-heated, the reheated steam behind the reheater is increased, the thrust balance of the high-pressure cylinder and the low-pressure cylinder of the steam turbine is affected, and the change range of the attemperation water quantity of the reheater water spray attemperation is large, so that the load fluctuation of the unit is large. The reheater water spray attemperation mode can only be used for adjusting the reheated steam temperature in an accident state, and another mode must be found as a means for normally adjusting the reheater steam temperature.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a temperature reduction regulating system for regulating the temperature of reheat steam of a reheat boiler, which has simple structure, good temperature reduction effect, safe operation and convenient installation and maintenance.
The utility model discloses an it has adopted an adjust reheat boiler reheat steam temperature's temperature reduction governing system to realize above-mentioned purpose, including boiler steam turbine input, one-level desuperheater, low temperature reheater, second grade desuperheater, high temperature reheater, the boiler steam turbine output that communicates in proper order, its characterized in that: the low temperature reheater is equipped with entry header and export header, the low temperature reheater outside is equipped with the pipeline, the pipeline is in the outside intercommunication entry header of low temperature reheater and export header, be equipped with the motorised valve on the pipeline.
Furthermore, the first-stage desuperheater and the second-stage desuperheater are both provided with desuperheating water through ends. The structure is characterized in that under the normal operation condition, the reheated cold steam from the high-pressure cylinder of the steam turbine is heated by the low-temperature reheater and the high-temperature reheater of the boiler and then enters the low-pressure cylinder of the steam turbine to do work. When the temperature of the reheat steam is over-temperature, the amount of flue gas passing through a boiler reheater is adjusted by adjusting a flue gas damper arranged at the tail flue of the boiler under the normal condition, so as to achieve the purpose of adjusting the temperature of the reheat steam. But less when boiler capacity, when unable setting up afterbody flue damper, through the utility model discloses governing system lets partly reheat steam pass through bypass pipeline and directly reachs the export of low temperature reheater, makes it not through low temperature reheater heat transfer to reach the purpose that reduces reheat steam temperature.
The utility model discloses a characteristics and beneficial effect: the bypass pipeline system and the reheater water spray temperature reduction system act together to supplement each other, so that the temperature of the reheated steam can be flexibly adjusted, and the problem of the overtemperature of the reheated steam caused by load and fuel enthalpy value fluctuation is solved.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, a temperature-reducing control system for adjusting reheat steam temperature of reheat boiler, including boiler steam turbine input end, one-level desuperheater 1, low temperature reheater 3, second grade desuperheater 5, high temperature reheater 8, the boiler steam turbine output end that communicate in proper order, low temperature reheater 3 is equipped with entry header 2 and export header 4, low temperature reheater 3 outside is equipped with pipeline 6, pipeline 6 is in low temperature reheater 3 outside intercommunication entry header 2 and export header 4, be equipped with motorised valve 7 on pipeline 6. And the first-stage desuperheater 1 and the second-stage desuperheater 5 are both provided with a desuperheating water lead-in end 9.
Under the normal operation condition, the electric valve on the bypass pipeline is closed. The reheated cold steam from the high-pressure cylinder of the steam turbine is heated by a low-temperature reheater and a high-temperature reheater of the boiler and then enters the low-pressure cylinder of the steam turbine to do work. When the reheated steam is over-temperature, the electric valve on the bypass pipeline is fully opened or partially opened through temperature feedback, and a part of reheated steam directly reaches the outlet of the low-temperature reheater through the bypass pipeline, so that the reheated steam does not exchange heat through the low-temperature reheater, and the purpose of reducing the temperature of the reheated steam is achieved. Because the resistance of the bypass pipeline is smaller than that of the heat exchange coil of the low-temperature reheater, the bypass scheme is smooth and feasible.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the spirit and scope of the present invention. Without departing from the design concept of the present invention, the ordinary persons in the field should all belong to the scope of the present invention in various modifications and improvements made by the technical solution of the present invention.
Claims (2)
1. The utility model provides an adjust attemperation governing system of reheat boiler reheat steam temperature, includes boiler steam turbine input, one-level desuperheater (1), low temperature reheater (3), second grade desuperheater (5), high temperature reheater (8), the boiler steam turbine output that communicates in proper order, its characterized in that: low temperature reheater (3) are equipped with entry header (2) and export header (4), low temperature reheater (3) outside is equipped with pipeline (6), pipeline (6) are in low temperature reheater (3) outside intercommunication entry header (2) and export header (4), be equipped with motorised valve (7) on pipeline (6).
2. A attemperation system for adjusting reheat steam temperature of a boiler as set forth in claim 1, wherein: and the primary desuperheater (1) and the secondary desuperheater (5) are both provided with desuperheating water lead-in ends (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921063191.0U CN210165362U (en) | 2019-07-09 | 2019-07-09 | Temperature-reducing adjusting system for adjusting temperature of reheat steam of reheat boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921063191.0U CN210165362U (en) | 2019-07-09 | 2019-07-09 | Temperature-reducing adjusting system for adjusting temperature of reheat steam of reheat boiler |
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| CN210165362U true CN210165362U (en) | 2020-03-20 |
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| CN201921063191.0U Active CN210165362U (en) | 2019-07-09 | 2019-07-09 | Temperature-reducing adjusting system for adjusting temperature of reheat steam of reheat boiler |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113154362A (en) * | 2021-05-11 | 2021-07-23 | 西安热工研究院有限公司 | System and method for adjusting reheat steam parameters of coal-fired power generating unit |
| CN114253315A (en) * | 2022-03-02 | 2022-03-29 | 天津国能津能滨海热电有限公司 | Control method for reheating steam temperature of boiler, electronic equipment and storage medium |
| CN114576614A (en) * | 2022-02-28 | 2022-06-03 | 国能经济技术研究院有限责任公司 | Reheat steam temperature adjusting system and adjusting control method |
-
2019
- 2019-07-09 CN CN201921063191.0U patent/CN210165362U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113154362A (en) * | 2021-05-11 | 2021-07-23 | 西安热工研究院有限公司 | System and method for adjusting reheat steam parameters of coal-fired power generating unit |
| CN114576614A (en) * | 2022-02-28 | 2022-06-03 | 国能经济技术研究院有限责任公司 | Reheat steam temperature adjusting system and adjusting control method |
| CN114576614B (en) * | 2022-02-28 | 2024-04-26 | 国能经济技术研究院有限责任公司 | Reheat steam temperature adjusting system and adjusting control method |
| CN114253315A (en) * | 2022-03-02 | 2022-03-29 | 天津国能津能滨海热电有限公司 | Control method for reheating steam temperature of boiler, electronic equipment and storage medium |
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