CN111536502A - T-shaped furnace secondary reheating system capable of flexibly adjusting temperature - Google Patents
T-shaped furnace secondary reheating system capable of flexibly adjusting temperature Download PDFInfo
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- CN111536502A CN111536502A CN202010307928.XA CN202010307928A CN111536502A CN 111536502 A CN111536502 A CN 111536502A CN 202010307928 A CN202010307928 A CN 202010307928A CN 111536502 A CN111536502 A CN 111536502A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
- F22G1/02—Steam superheating characterised by heating method with heat supply by hot flue gases from the furnace of the steam boiler
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G3/00—Steam superheaters characterised by constructional features; Details of component parts thereof
- F22G3/006—Steam superheaters with heating tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
- F22G5/123—Water injection apparatus
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Abstract
The invention discloses a T-shaped furnace secondary reheating system capable of flexibly adjusting temperature, and relates to a T-shaped furnace secondary reheating system. The invention aims to solve the problem that the secondary reheating unit of the existing medium-large power station cannot achieve timely temperature regulation due to time delay in the commonly adopted burner swing and flue gas recirculation temperature regulation mode under variable load. The system of the invention comprises: the boiler comprises a boiler hearth provided with a burner, wherein a separating screen superheater, a rear screen superheater, a final superheater, a primary high-pressure high-temperature reheater, a secondary low-pressure high-temperature reheater, a primary high-pressure low-temperature reheater, a secondary low-pressure low-temperature reheater and a steam-steam heat exchanger are sequentially arranged at the upper part of the boiler hearth provided with the burner; the boiler tail flue is divided into a front flue and a rear flue, a primary high-pressure low-temperature reheater and a front well gas-saving device are arranged in the front flue, and a secondary low-pressure low-temperature reheater and a rear well gas-saving device are arranged in the rear flue. Belongs to the technical field of energy.
Description
Technical Field
The invention belongs to the technical field of energy, and particularly relates to a T-shaped furnace secondary reheating system capable of flexibly adjusting temperature.
Background
Energy conservation and environmental protection are important directions for the development of electric power equipment, and the double-reheating ultra-supercritical coal burning technology is an advanced and clean-emission high-efficiency power generation technology and meets the requirements of national policies. The environment protection becomes an important direction of national policy, the requirement on pollutant emission indexes of a power station boiler is higher, and meanwhile, the high-capacity and high-parameter high-efficiency ultra-supercritical coal burning technology has the outstanding advantages of high efficiency, environmental protection and the like, not only saves resources, but also has huge environmental protection benefits, is an important development direction in future development of the boiler market, and has wide market prospect.
To current large-scale power station secondary reheating unit, the difficult assurance of two-stage reheat steam temperature, especially there is the problem of being owed the temperature in low pressure high temperature reheater under the low-load, and to current secondary reheating unit, the over heater all is preceding moreover, and how that realizes giving the reheater the heat of over heater urgent need to be solved. The commonly adopted burner swing and flue gas recirculation temperature regulation mode has time delay under variable load, and the aim of timely temperature regulation cannot be achieved. Therefore, it is important to develop a new tempering strategy.
Disclosure of Invention
The invention aims to solve the problem that the commonly adopted burner swing and flue gas recirculation temperature regulation mode of a large-scale power station secondary reheating unit in the prior art has time delay under variable load and cannot achieve the purpose of timely temperature regulation, and provides a T-shaped furnace secondary reheating system capable of flexibly regulating temperature.
A T-shaped furnace secondary reheating system capable of flexibly adjusting temperature comprises:
the system comprises a primary high-pressure low-temperature reheater, a secondary low-pressure low-temperature reheater and a steam-steam heat exchanger; the boiler tail flue is divided into a front flue and a rear flue, a primary high-pressure low-temperature reheater and a front well gas-saving device are arranged in the front flue, and a secondary low-pressure low-temperature reheater and a rear well gas-saving device are arranged in the rear flue;
steam led out from the top of the separator sequentially passes through the separating screen superheater, the rear screen superheater, the steam-steam heat exchanger and the final superheater to become main steam, and the main steam enters the ultrahigh pressure cylinder of the steam turbine;
a steam outlet of the turbine ultrahigh pressure cylinder is communicated with an inlet of the turbine high pressure cylinder after passing through a primary high pressure low temperature reheater and a primary high pressure high temperature reheater;
a steam outlet of the high-pressure cylinder of the steam turbine is communicated with an inlet of a medium-pressure cylinder of the steam turbine after passing through a secondary low-pressure low-temperature reheater and a secondary low-pressure high-temperature reheater;
the steam-steam heat exchanger is arranged outside the boiler, a bypass valve is arranged on a shell of the steam-steam heat exchanger, outlet steam of the rear screen superheater enters a pipe of the steam-steam heat exchanger and is conveyed to a final superheater, and outlet steam of a steam turbine intermediate pressure cylinder and low-temperature secondary steam of a secondary low-pressure low-temperature reheater cold section and a secondary low-pressure high-temperature reheater cold section are mixed and then enter the pipe of the steam-steam heat exchanger and are conveyed to a low-pressure cylinder.
Advantageous effects
The invention increases the temperature of the mixed secondary steam by adjusting the percentage of the secondary steam passing through the steam heater (namely the flow), improves the efficiency of the whole system and reduces the coal consumption; the system can realize system optimization while ensuring that steam parameters of each stage meet requirements; the invention is beneficial to the development of national thermal power generating units towards the direction of energy saving, high efficiency and environmental protection, and has important economic benefit and environmental protection benefit;
the temperature of the two-stage reheater is guaranteed by using the steam-steam heat exchanger, a new secondary reheating temperature regulation strategy applicable to the T-shaped furnace is developed, and a new model applicable to the T-shaped furnace secondary reheating thermal system is established.
The purpose of the invention is as follows: in order to realize higher level of the overall efficiency of the unit, the limitation of water spraying and temperature regulation of the reheater is comprehensively considered, in order to meet peak regulation national conditions, the load of the unit must meet the power grid instruction, according to different loads, the secondary steam flow passing through the steam-steam heat exchanger is changed through a bypass valve on the steam-steam heat exchanger so as to change the heat absorption capacity of the secondary steam to achieve the purpose of regulating the secondary steam, and further, the temperature of the reheater is regulated.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Detailed Description
The first embodiment is as follows: the present embodiment will be described with reference to fig. 1, and a flexible temperature-adjustable secondary reheating system for a T-furnace includes: the boiler furnace 2 provided with the combustor and the upper part of the boiler furnace 2 provided with the combustor are sequentially provided with a separating screen superheater 10, a rear screen superheater 4, a final superheater 5, a primary high-pressure high-temperature reheater 7 and a secondary low-pressure high-temperature reheater 11;
the system further comprises: a primary high-pressure low-temperature reheater 6, a secondary low-pressure low-temperature reheater 3 and a steam-steam heat exchanger 12; the boiler tail flue is divided into a front flue and a rear flue, a primary high-pressure low-temperature reheater 6 and a front well gas-saving 1-1 are arranged in the front flue, and a secondary low-pressure low-temperature reheater 3 and a rear well gas-saving 1-2 are arranged in the rear flue;
steam led out from the top of the separator sequentially passes through a separating screen superheater 10, a rear screen superheater 4, a steam-steam heat exchanger 12 and a final superheater 5 to become main steam, and the main steam enters a turbine ultrahigh pressure cylinder;
a steam outlet of the turbine ultrahigh pressure cylinder is communicated with an inlet of the turbine high pressure cylinder after passing through a primary high pressure low temperature reheater 6 and a primary high pressure high temperature reheater 7;
a steam outlet of the high-pressure cylinder of the steam turbine is communicated with an inlet of a medium-pressure cylinder of the steam turbine after passing through a secondary low-pressure low-temperature reheater 3 and a secondary low-pressure high-temperature reheater 11;
the steam-steam heat exchanger 12 is arranged outside the boiler, a bypass valve is arranged on the shell of the steam-steam heat exchanger 12, outlet steam of the rear screen superheater 4 enters a pipe of the steam-steam heat exchanger and is conveyed to the final superheater 5, and outlet steam of a steam turbine intermediate pressure cylinder is mixed with low-temperature secondary steam of a secondary low-pressure low-temperature reheater cold section and a secondary low-pressure high-temperature reheater cold section and then enters the pipe of the steam-steam heat exchanger to be conveyed to a low-pressure cylinder;
as shown in fig. 1, the steam-steam heat exchanger 12 is disposed outside the boiler, a bypass valve is installed on a casing of the steam-steam heat exchanger 12, outlet steam of the rear platen superheater 4 enters a tube of the steam-steam heat exchanger 12 and is conveyed to the final superheater 5, and outlet steam of the high-pressure steam turbine cylinder and low-temperature secondary steam from a cold section of the secondary low-pressure low-temperature reheater 3 and a cold section of the secondary low-pressure high-temperature reheater 11 are mixed and then enter a tube of the steam-steam heat exchanger 12, and are finally conveyed to the intermediate-pressure cylinder.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is that the outlet steam of the high-pressure cylinder of the steam turbine specifically includes:
steam led out from the top of the separator 8 sequentially passes through the separating screen superheater 10, the rear screen superheater 4, the steam-steam heat exchanger 12 and the final superheater 5 to become main steam, and the main steam enters a Super high pressure turbine (SHP);
the steam outlet of the turbine ultrahigh pressure cylinder is communicated with the inlet of the turbine high pressure cylinder (HP) after passing through the front well economizer 1-1, the primary high pressure low temperature reheater 6 and the primary high pressure low temperature reheater 7, enters the inlet of the turbine high pressure cylinder, and is discharged from the outlet of the high pressure cylinder after the high pressure cylinder works, namely the outlet steam of the turbine high pressure cylinder.
Other steps and parameters are the same as those in the first embodiment.
The third concrete implementation mode: the difference between this embodiment and the first or second embodiment is that the low-temperature secondary steam in the cold section of the secondary low-pressure low-temperature reheater 3 specifically includes:
the secondary low-pressure low-temperature reheater 3 is communicated with the rear well economizer 1-2, the rear well economizer 1-2 is communicated with water supply and then heated, and the heated steam enters the secondary low-pressure low-temperature reheater 3 along with the steam from the high-pressure cylinder, namely the low-temperature secondary steam of the cold section of the secondary low-pressure low-temperature reheater 3.
Other steps and parameters are the same as those in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment and the first to third embodiments is that the low-temperature secondary steam from the cold stage of the secondary low-pressure high-temperature reheater 11 specifically includes:
the primary high-pressure low-temperature reheater 6 is communicated with the front well economizer 1-1, the front well economizer 1-1 is communicated with feed water and then heated, and the heated steam enters the primary high-pressure low-temperature reheater 6 along with main steam of the ultra-high pressure cylinder, namely low-temperature secondary steam from a cold section of the secondary low-pressure high-temperature reheater 11.
Other steps and parameters are the same as those in one of the first to third embodiments.
The working principle is as follows:
steam led out from the top of the separator sequentially passes through a separating screen superheater 10, a rear screen superheater 4, a steam-steam heat exchanger 12 and a final superheater 5 to become main steam, and the main steam enters a turbine ultrahigh pressure cylinder;
a steam outlet of the turbine ultrahigh pressure cylinder is communicated with an inlet of the turbine high pressure cylinder after passing through a primary high pressure low temperature reheater 6 and a primary high pressure high temperature reheater 7;
a steam outlet of the high-pressure cylinder of the steam turbine is communicated with an inlet of a medium-pressure cylinder of the steam turbine after passing through a secondary low-pressure low-temperature reheater 3 and a secondary low-pressure high-temperature reheater 11;
the steam-steam heat exchanger 12 is arranged outside the boiler, a bypass valve is arranged on a shell of the steam-steam heat exchanger 12, outlet steam of the rear screen superheater 4 enters a pipe of the steam-steam heat exchanger and is conveyed to the final superheater 5, and outlet steam of a steam turbine intermediate pressure cylinder and low-temperature secondary steam of a secondary low-pressure low-temperature reheater cold section and a secondary low-pressure high-temperature reheater cold section are mixed and then enter the pipe of the steam-steam heat exchanger to be conveyed to a low-pressure cylinder.
Claims (4)
1. The utility model provides a T type stove reheat system of can adjusting temperature in a flexible way which characterized in that includes:
the boiler furnace provided with the combustor, and the upper part of the boiler furnace provided with the combustor are sequentially provided with a separating screen superheater, a rear screen superheater, a final superheater, a primary high-pressure high-temperature reheater and a secondary low-pressure high-temperature reheater;
the system further comprises: the system comprises a primary high-pressure low-temperature reheater, a secondary low-pressure low-temperature reheater and a steam-steam heat exchanger; the boiler tail flue is divided into a front flue and a rear flue, a primary high-pressure low-temperature reheater and a front well gas-saving device are arranged in the front flue, and a secondary low-pressure low-temperature reheater and a rear well gas-saving device are arranged in the rear flue;
steam led out from the top of the separator sequentially passes through the separating screen superheater, the rear screen superheater, the steam-steam heat exchanger and the final superheater to become main steam, and the main steam enters the ultrahigh pressure cylinder of the steam turbine;
a steam outlet of the turbine ultrahigh pressure cylinder is communicated with an inlet of the turbine high pressure cylinder after passing through a primary high pressure low temperature reheater and a primary high pressure high temperature reheater;
a steam outlet of the high-pressure cylinder of the steam turbine is communicated with an inlet of a medium-pressure cylinder of the steam turbine after passing through a secondary low-pressure low-temperature reheater and a secondary low-pressure high-temperature reheater;
the steam-steam heat exchanger is arranged outside the boiler, a bypass valve is arranged on a shell of the steam-steam heat exchanger, outlet steam of the rear screen superheater enters a pipe of the steam-steam heat exchanger and is conveyed to a final superheater, and outlet steam of a steam turbine intermediate pressure cylinder and low-temperature secondary steam of a secondary low-pressure low-temperature reheater cold section and a secondary low-pressure high-temperature reheater cold section are mixed and then enter the pipe of the steam-steam heat exchanger and are conveyed to a low-pressure cylinder.
The steam-steam heat exchanger is arranged outside the boiler, a bypass valve is installed on a shell of the steam-steam heat exchanger, outlet steam of the rear screen superheater enters a pipe of the steam-steam heat exchanger and is conveyed to a final superheater, and outlet steam of a high-pressure cylinder of the steam turbine and low-temperature secondary steam from a cold section of a secondary low-pressure low-temperature reheater and a cold section of a secondary low-pressure high-temperature reheater are mixed and then enter the pipe of the steam-steam heat exchanger, and are finally conveyed to an intermediate-pressure cylinder.
2. The T-shaped furnace secondary reheating system capable of flexibly adjusting the temperature according to claim 1, wherein outlet steam of a high-pressure cylinder of a steam turbine is specifically as follows:
steam led out from the top of the separator sequentially passes through the separating screen superheater, the rear screen superheater, the steam-steam heat exchanger and the final superheater to become main steam, and the main steam enters the ultrahigh pressure cylinder of the steam turbine;
the steam outlet of the turbine ultrahigh pressure cylinder is communicated with the inlet of the turbine high pressure cylinder after passing through the front well economizer, the primary high pressure low temperature reheater and the primary high pressure low temperature reheater, enters the inlet of the turbine high pressure cylinder, and is discharged from the outlet of the high pressure cylinder after the high pressure cylinder works, namely the outlet steam of the turbine high pressure cylinder.
3. The flexible temperature-adjustable T-shaped furnace secondary reheating system as claimed in claim 2, wherein the low-temperature secondary steam of the cold section of the secondary low-pressure low-temperature reheater; the method specifically comprises the following steps:
the secondary low-pressure low-temperature reheater is communicated with the rear well economizer, the rear well economizer is communicated with water supply and then heated, and heated steam enters the secondary low-pressure low-temperature reheater along with steam from the high-pressure cylinder, namely low-temperature secondary steam of a cold section of the secondary low-pressure low-temperature reheater.
4. The T-shaped furnace secondary reheating system capable of flexibly adjusting the temperature according to claim 3, wherein low-temperature secondary steam from a cold section of the secondary low-pressure high-temperature reheater is specifically:
the primary high-pressure low-temperature reheater is communicated with the front well economizer, the front well economizer is communicated with feed water and then heated, and the heated steam enters the primary high-pressure low-temperature reheater along with main steam of the ultrahigh pressure cylinder, namely low-temperature secondary steam from a cold section of the secondary low-pressure high-temperature reheater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010307928.XA CN111536502A (en) | 2020-04-17 | 2020-04-17 | T-shaped furnace secondary reheating system capable of flexibly adjusting temperature |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010307928.XA CN111536502A (en) | 2020-04-17 | 2020-04-17 | T-shaped furnace secondary reheating system capable of flexibly adjusting temperature |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102374524A (en) * | 2011-10-28 | 2012-03-14 | 西安热工研究院有限公司 | Secondary reheating system for power-station boiler |
| CN102913892A (en) * | 2012-11-19 | 2013-02-06 | 上海锅炉厂有限公司 | T-shaped boiler with reheater |
| CN106122938A (en) * | 2016-07-05 | 2016-11-16 | 哈尔滨工业大学 | A kind of can the double reheat system of power station boiler of homoiothermic flexibly |
| CN208312354U (en) * | 2018-05-23 | 2019-01-01 | 清华大学 | A kind of double reheat electricity generation system |
-
2020
- 2020-04-17 CN CN202010307928.XA patent/CN111536502A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102374524A (en) * | 2011-10-28 | 2012-03-14 | 西安热工研究院有限公司 | Secondary reheating system for power-station boiler |
| CN102913892A (en) * | 2012-11-19 | 2013-02-06 | 上海锅炉厂有限公司 | T-shaped boiler with reheater |
| CN106122938A (en) * | 2016-07-05 | 2016-11-16 | 哈尔滨工业大学 | A kind of can the double reheat system of power station boiler of homoiothermic flexibly |
| CN208312354U (en) * | 2018-05-23 | 2019-01-01 | 清华大学 | A kind of double reheat electricity generation system |
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Application publication date: 20200814 |
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