CN218993488U - Bypass steam cascade utilization heat supply system based on boiler ageing allowance - Google Patents
Bypass steam cascade utilization heat supply system based on boiler ageing allowance Download PDFInfo
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- CN218993488U CN218993488U CN202223576543.7U CN202223576543U CN218993488U CN 218993488 U CN218993488 U CN 218993488U CN 202223576543 U CN202223576543 U CN 202223576543U CN 218993488 U CN218993488 U CN 218993488U
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Abstract
A bypass steam cascade utilization heat supply system based on a boiler aging margin comprises a boiler, a high-pressure cylinder of the boiler, a middle-pressure cylinder of the boiler, a low-pressure cylinder of the boiler and a condenser, wherein a high-side valve and the high-pressure cylinder of the boiler are connected in parallel between a superheater outlet of the boiler and a reheater inlet of the boiler, the superheater outlet of the boiler is respectively connected with the middle-pressure cylinder of the boiler and the condenser through the low-side valve, the middle-pressure cylinder of the boiler, the low-pressure cylinder of the boiler and the condenser are sequentially connected, an outlet of the middle-pressure cylinder of the boiler is also connected to an inlet of a steam header through a first flow control piece, and an outlet of the steam header is connected with a heating network heater; the superheater outlet of the boiler is also sequentially connected with a steam cooler, a residual pressure utilization back press and a steam header, and flow control pieces are arranged between the superheater outlet of the boiler and the steam cooler, between the steam cooler and the residual pressure utilization back press and between the residual pressure utilization back press and the steam header. The utility model can improve the heat supply capacity of the group and avoid energy waste when high-quality steam supplies heat.
Description
Technical Field
The utility model relates to a bypass steam cascade utilization heating system based on a boiler aging allowance, and belongs to the technical field of steam turbine application of power generation technology.
Background
With the construction of urbanization and environmental protection demands, central heating is a main heating mode, the heat supply demand on a coal-fired thermal power unit is suddenly increased, and meanwhile, with the improvement of life quality, the unit heat supply reliability is a main hardness index of the heat supply unit.
For heating units, a complete machine bypass system to the heat exchanger of the heating system is typically provided. When the heat load is larger than the maximum steam discharge amount of the back pressure steam turbine or the maximum steam extraction amount of the steam extraction unit (such as in the peak heat load period), or during the maintenance period of the steam turbine, the high-temperature and high-pressure steam generated by the boiler can be directly supplied to a user after being subjected to temperature and pressure reduction through the bypass system so as to compensate the heat supply deficiency.
The existing bypass heating mode is simple, but the heat supply energy consumption of the bypass heating system is 1.5 times of that of a conventional heating system, and the energy waste of high-quality steam for heating is inevitably caused.
In addition, due to the continuous improvement of design concepts and manufacturing processes, most of boilers are maintained and run well in the state of current power plant equipment management, and the aging allowance of the boilers can be always maintained at a higher level basically in the normal service life, so that the boiler is lack of full utilization and is contradictory with the current sudden increase of thermal power supply requirements.
Disclosure of Invention
In order to overcome the defects in the prior art, the utility model provides a bypass steam cascade utilization heat supply system based on a boiler aging allowance, which can improve the heat supply capacity of a unit and avoid energy waste during heat supply through high-quality steam.
The technical scheme adopted for solving the technical problems is as follows:
a bypass steam cascade utilization heat supply system based on a boiler aging margin comprises a boiler, a high-pressure cylinder of the boiler, a middle-pressure cylinder of the boiler, a low-pressure cylinder of the boiler and a condenser, wherein a high-side valve and the high-pressure cylinder of the boiler are connected in parallel between a superheater outlet of the boiler and a reheater inlet of the boiler, the superheater outlet of the boiler is respectively connected with the middle-pressure cylinder of the boiler and the condenser through the low-side valve, the middle-pressure cylinder of the boiler, the low-pressure cylinder of the boiler and the condenser are sequentially connected, an outlet of the middle-pressure cylinder of the boiler is also connected to an inlet of a steam header through a first flow control piece, and an outlet of the steam header is connected with a heating network heater; the superheater outlet of the boiler is also sequentially connected with a steam cooler, a residual pressure utilization back press and a steam header, a second flow control piece and a third flow control piece are arranged between the superheater outlet of the boiler and the steam cooler, a fourth flow control piece and a fifth flow control piece are arranged between the steam cooler and the residual pressure utilization back press, and a sixth flow control piece is arranged between the residual pressure utilization back press and the steam header.
Optionally, a working medium circulation pipeline is connected between the condenser and the boiler, and a regenerative heater and a steam cooler are sequentially arranged on the working medium circulation pipeline along the steam flow direction.
Optionally, the third flow control, the steam cooler and the fourth flow control are connected and provided with a first temperature-reducing and pressure-reducing bypass, and a seventh flow control is arranged on the first temperature-reducing and pressure-reducing bypass.
Optionally, the fifth flow control element and the residual pressure are connected by a back press and the sixth flow control element to be provided with a second temperature-reducing and pressure-reducing bypass, and an eighth flow control element is arranged on the second temperature-reducing and pressure-reducing bypass.
Optionally, the first flow control, third flow control, fourth flow control, fifth flow control and sixth flow control all employ valves; the second, seventh and eighth flow controls each employ an adjustment gate.
Compared with the prior art, the bypass steam cascade utilization heating system based on the boiler aging allowance utilizes the maximum evaporation capacity of the boiler aging allowance, namely the evaporation capacity of the Boiler (BMCR) under the working condition, by means of the high-side valve and the high-pressure cylinder of the steam turbine connected in parallel between the superheater outlet of the boiler and the reheater inlet of the boiler, the superheater outlet of the boiler is respectively connected with the medium-pressure cylinder of the steam turbine and the condenser through the low-side valve, the medium-pressure cylinder of the steam turbine, the low-pressure cylinder of the steam turbine and the condenser are sequentially connected, the outlet of the medium-pressure cylinder of the steam turbine is connected to the inlet of the steam header, the outlet of the steam header is connected with the heating network heater, the superheater outlet of the boiler is also sequentially connected with the steam cooler, the residual pressure utilization back press and the steam header, the steam cascade utilization of the surplus evaporation capacity is completed, the heat supply capacity of the unit is improved, and the energy waste during heat supply through high-quality steam is avoided.
Drawings
The utility model will be further described with reference to the drawings and examples.
FIG. 1 is a schematic diagram of a boiler burn-in margin based bypass steam cascade utilization heating system in accordance with an embodiment of the present utility model.
The reference numerals in the drawings illustrate: 1-a boiler; 2-a high-pressure cylinder of the steam turbine; 3-a middle pressure cylinder of the steam turbine; 4-a low-pressure cylinder of the steam turbine; 5-a condenser; 6-backheating the heater; 7-a steam cooler; 8-a steam header; 9-a heat supply network heater; 10-high side valve; 11-low side valve; 12-a first valve; 13-a first trim gate; 14-a second trim gate; 15-a second valve; 16-a third valve; 17-fourth valve; 18-a third trim gate; 19-a fifth valve; the 20-excess pressure was used with a back press.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.
FIG. 1 shows a schematic structural diagram of a preferred embodiment of the present utility model, wherein a bypass steam cascade utilization heating system based on a boiler aging margin comprises a boiler 1, a high-pressure cylinder 2 of a steam turbine, a medium-pressure cylinder 3 of the steam turbine, a low-pressure cylinder 4 of the steam turbine and a condenser 5, wherein a high-side valve 10 and the high-pressure cylinder 2 of the steam turbine are connected in parallel between a superheater outlet of the boiler 1 and a reheater inlet of the boiler 1, the superheater outlet of the boiler 1 is respectively connected with the medium-pressure cylinder 3 of the steam turbine and the condenser 5 through a low-side valve 11, the medium-pressure cylinder 3 of the steam turbine, the low-pressure cylinder 4 of the steam turbine and the condenser 5 are sequentially connected, an outlet of the medium-pressure cylinder 3 of the steam turbine is also connected to an inlet of a steam header 8 through a first flow control piece, and an outlet of the steam header 8 is connected with a heating network heater 9; the superheater outlet of the boiler 1 is also sequentially connected with a steam cooler 7, a residual pressure utilization back press 20 and a steam header 8, a second flow control piece and a third flow control piece are arranged between the superheater outlet of the boiler 1 and the steam cooler 7, a fourth flow control piece and a fifth flow control piece are arranged between the steam cooler 7 and the residual pressure utilization back press 20, and a sixth flow control piece is arranged between the residual pressure utilization back press 20 and the steam header 8.
In a specific implementation, the first flow control element, the third flow control element, the fourth flow control element, the fifth flow control element and the sixth flow control element all adopt valves, namely a first valve 12, a second valve 15, a fourth valve 17, a fifth valve 19 and a sixth valve respectively; the second, seventh and eighth flow control members each employ an adjustment gate, namely a first adjustment gate 13, a second adjustment gate and a third adjustment gate 18, respectively.
Under the bypass heat supply working condition, by utilizing the steam with the evaporation aging allowance in the boiler 1, the high side valve 10 is adjusted to directly bypass part of main steam into the reheater of the boiler 1 before entering the high pressure cylinder 2 of the steam turbine, and part of steam heated by reheating enters the cascade utilization heat supply before entering the medium pressure cylinder 3 of the steam turbine.
The opening of the first adjusting door 13 is adjusted to enter a steam side operation mode, so that reheat steam enters a cascade utilization heat supply system, at the moment, the second valve 15, the third valve 16, the fourth valve 17 and the fifth valve 19 are fully opened, so that the steam enters the steam cooler 7 to exchange heat with water in the water supply system, the heat-exchanged steam enters the residual pressure utilization back press 20 to perform work and power generation, and the work-done steam enters the steam header 8 to be mixed with heat supply and steam extraction of a pressure cylinder in a steam turbine and then enters the heat supply network heater 9 to realize external heat supply.
As a further optional implementation manner of this embodiment, a working medium circulation pipeline is connected between the condenser 5 and the boiler 1, and a regenerative heater 6 and a steam cooler 7 are sequentially arranged on the working medium circulation pipeline along the steam flow direction.
The part of reheat steam of the boiler 1 enters the condenser through the low side valve 11, then sequentially passes through the regenerative heater 6 and the steam cooler 7 to exchange heat fully, and finally returns to the reheater of the boiler 1.
In the water side operation mode, the exhaust steam of the middle pressure cylinder of the steam turbine enters the low pressure cylinder of the steam turbine to do work, then is cooled by the condenser 5 and enters the conventional regenerative heater 6, and the heated feed water enters the steam cooler 7 to be further heated and then enters the boiler 1 to complete the working medium circulation.
As a further alternative implementation of the present embodiment, the third flow control, the steam cooler 7 and the fourth flow control are connected and provided with a first temperature-reducing and pressure-reducing bypass, and a seventh flow control is arranged on the first temperature-reducing and pressure-reducing bypass. The third flow control, the fourth flow control and the seventh flow control are embodied as a second valve 15, a third valve 16 and a second regulating gate 14.
The second regulating gate 14 is used as a temperature and pressure reducing bypass of the steam cooler 7, and when the steam quantity is large, the excessive steam quantity can be directly reduced in temperature and pressure and then enter the steam header 8 through regulating the second regulating gate 14.
As a further alternative implementation of this embodiment, the fifth flow control and the residual pressure are connected by using the back press 20 and the sixth flow control and provided with a second temperature-reducing and pressure-reducing bypass, and the second temperature-reducing and pressure-reducing bypass is provided with an eighth flow control. The fifth flow control, the sixth flow control and the eighth flow control are implemented as a fourth valve 17, a fifth valve 19 and a third trim door 18.
The third adjusting gate 18 is used as a bypass for reducing temperature and pressure of the back press 20, and when the steam quantity is large, the third adjusting gate 18 can be adjusted to enable the excessive steam quantity to directly enter the steam header 8 after reducing temperature and pressure.
As a further alternative to this example, the first, third, fourth, fifth, and sixth flow controls each employ valves; the second, seventh and eighth flow controls each employ an adjustment gate.
According to the boiler aging margin-based bypass steam cascade utilization heat supply system, the aging and evaporation margin of the boiler 1 can be utilized, the conventional 350MW supercritical unit has about 5% of aging margin evaporation capacity, the cascade utilization of reheat steam is realized, the reheat steam is cooled to about 330 ℃ through the steam cooler 7, the temperature of water supply is improved to about 5 ℃, meanwhile, the residual pressure is utilized to generate power by the back press 20 to about 8000kW, the power supply equipment is used, finally, the exhaust steam of the residual pressure utilization back press 20 is utilized to realize external heat supply through the hot net heater 9, so that the heat supply capacity of the unit can be improved, and meanwhile, the energy waste during heat supply through high-quality steam is avoided.
The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the utility model in any way, but any simple modification and equivalent variation of the above embodiment according to the technical spirit of the present utility model falls within the scope of the present utility model.
Claims (5)
1. A bypass steam cascade utilization heat supply system based on a boiler aging margin comprises a boiler, a high-pressure cylinder of the boiler, a middle-pressure cylinder of the boiler, a low-pressure cylinder of the boiler and a condenser, wherein a high-side valve and the high-pressure cylinder of the boiler are connected in parallel between a superheater outlet of the boiler and a reheater inlet of the boiler, the superheater outlet of the boiler is respectively connected with the middle-pressure cylinder of the boiler and the condenser through the low-side valve, the middle-pressure cylinder of the boiler, the low-pressure cylinder of the boiler and the condenser are sequentially connected, an outlet of the middle-pressure cylinder of the boiler is also connected to an inlet of a steam header through a first flow control piece, and an outlet of the steam header is connected with a heating network heater; the method is characterized in that: the superheater outlet of the boiler is also sequentially connected with a steam cooler, a residual pressure utilization back press and a steam header, a second flow control piece and a third flow control piece are arranged between the superheater outlet of the boiler and the steam cooler, a fourth flow control piece and a fifth flow control piece are arranged between the steam cooler and the residual pressure utilization back press, and a sixth flow control piece is arranged between the residual pressure utilization back press and the steam header.
2. The boiler aging margin based bypass steam cascade utilization heating system of claim 1, wherein: a working medium circulating pipeline is connected between the condenser and the boiler, and a regenerative heater and a steam cooler are sequentially arranged on the working medium circulating pipeline along the steam flowing direction.
3. A boiler aging margin based bypass steam cascade utilization heating system as defined in claim 2, wherein: the third flow control piece, the steam cooler and the fourth flow control piece are connected and provided with a first temperature and pressure reduction bypass, and a seventh flow control piece is arranged on the first temperature and pressure reduction bypass.
4. A boiler aging margin based bypass steam cascade utilization heating system as defined in claim 3, wherein: the fifth flow control piece and the residual pressure are connected by the back press and the sixth flow control piece to form a second temperature and pressure reduction bypass, and an eighth flow control piece is arranged on the second temperature and pressure reduction bypass.
5. The boiler aging margin based bypass steam cascade utilization heating system of claim 4, wherein: valves are used for the first flow control, the third flow control, the fourth flow control, the fifth flow control and the sixth flow control; the second, seventh and eighth flow controls each employ an adjustment gate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223576543.7U CN218993488U (en) | 2022-12-30 | 2022-12-30 | Bypass steam cascade utilization heat supply system based on boiler ageing allowance |
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| CN202223576543.7U CN218993488U (en) | 2022-12-30 | 2022-12-30 | Bypass steam cascade utilization heat supply system based on boiler ageing allowance |
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