CN212481236U - Ultrahigh-pressure once-reheating power generation system - Google Patents
Ultrahigh-pressure once-reheating power generation system Download PDFInfo
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- CN212481236U CN212481236U CN202020678840.4U CN202020678840U CN212481236U CN 212481236 U CN212481236 U CN 212481236U CN 202020678840 U CN202020678840 U CN 202020678840U CN 212481236 U CN212481236 U CN 212481236U
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Abstract
The utility model provides a super high pressure is reheat power generation system once, including steam turbine and combustion boiler, the steam turbine is connected with the generator, the steam turbine includes steam turbine high pressure cylinder and steam turbine low pressure cylinder, be provided with evaporation water-cooling wall, swing combustor, wall type reheater, high temperature over heater, low temperature over heater, re-heater, economizer, air heater in the combustion boiler, air heater is connected with a fan and overfire fan, the bottom flue of combustion boiler has connected gradually dust remover, draught fan and chimney. The utility model discloses creatively be applied to the coal-fired power plant of rank below 50MW with 13.7MPa-540 ℃'s super high temperature reheat system once, greatly improved the efficiency and the economic benefits of power plant.
Description
Technical Field
The utility model belongs to the technical field of thermal power generation, more specifically relates to a super high pressure is reheat power generation system once.
Background
At present, the small-size coal-fired power plant of the rank below 50MW generally adopts the highly compressed unit of high temperature, adopts the once reheat mode of superhigh pressure to the small-size coal-fired power plant boiler of the rank below 50MW, because the flue gas volume of boiler unit fuel is less than biomass power station and gas power station far away, arranges and heat balance brings huge difficulty to over heater and re-heater in the afterbody flue behind the furnace, and then leads to the export steam temperature that can not the stable control re-heater. Therefore, a technical scheme that after a reheater is added to a coal-fired boiler of a grade below 50MW, the temperature of steam at an outlet of the reheater can be controlled is needed in the prior art.
SUMMERY OF THE UTILITY MODEL
To the not enough of above-mentioned prior art, the utility model provides a can be applied to the super high pressure reheat power generation system once of the small-size coal fired power plant of rank below 50MW with high temperature super high pressure parameter and a reheat mode.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:
the ultrahigh-pressure once-reheating power generation system comprises a steam turbine and a combustion boiler, wherein the steam turbine is connected with a power generator, the steam turbine comprises a steam turbine high-pressure cylinder and a steam turbine low-pressure cylinder, an evaporation water-cooling wall, a swing combustor, a wall-type reheater, a high-temperature superheater, a low-temperature superheater, a reheater, an economizer and an air preheater are arranged in the combustion boiler, the air preheater is connected with a primary fan and a secondary fan, and a flue outlet of the combustion boiler is sequentially connected with a pre-dust collector, a desulfurizing tower, a main dust collector, an induced draft fan and a chimney;
the steam inlet of the high-temperature steam turbine cylinder is connected with the steam outlet of the high-temperature superheater, the steam outlet of the high-temperature steam turbine cylinder is connected with the reheater and the steam inlet of the high-pressure heater, and the steam outlet of the reheater is connected with the steam inlet of the low-temperature steam turbine cylinder;
the steam outlet of the low-pressure cylinder of the steam turbine is connected with the steam inlets of a condensing device, a low-pressure heater and a thermal deaerator, and the condensing device is sequentially connected with a condensate pump, a shaft seal cooler, the low-pressure heater, the thermal deaerator, a boiler feed pump, a high-pressure heater and an economizer;
the steam turbine shaft seal cooling device is characterized in that a shaft seal cooling device steam inlet pipe used for collecting steam leakage of a steam turbine shaft seal is arranged on the shaft seal cooling device, a shaft seal cooling water outlet of the shaft seal cooling device is connected with a shaft seal cooling water inlet of the condensing equipment, a drain inlet of the thermal deaerator is connected with a drain outlet of the high-pressure heater, and the thermal deaerator is further connected with a desalting compensation water inlet pipe used for supplementing desalting compensation water.
The swinging burner is provided with a nozzle with an adjustable angle and an actuator for adjusting the angle of the nozzle.
The actuator is a servo motor.
The condensing equipment adopts an air cooling island or a water cooling condenser.
And a slag bin is arranged at the bottom of the combustion boiler.
The combustion boiler is one of a circulating fluidized bed boiler, a pulverized coal furnace, a grate furnace or a chain furnace.
The combustion boiler takes one or more of coal, garbage, biomass or solid waste as fuel.
The combustion boiler is a small combustion boiler applied to the scale grade below a 50MW steam turbine generator unit.
Compared with the prior art, the utility model beneficial effect be: a swinging burner is adopted to adjust the outlet temperature of the reheater, and water spraying temperature reduction is used for fine adjustment of steam temperature and accident conditions; the wall-type reheater is creatively arranged in the hearth, so that the reheater is separately arranged in the hearth and the tail flue, heat is rebalanced, and the requirement of stable outlet temperature of the reheater is met; the ultrahigh pressure and high temperature single reheating system is applied to a coal-fired power station with the power of below 50MW, so that the efficiency and the economic benefit of the power station are greatly improved.
Drawings
Fig. 1 is a schematic view of the thermodynamic system of the present invention.
Fig. 2 is a top view of the oscillating burner.
FIG. 3 is an enlarged view of a portion of the steam turbine, high pressure heater, thermal deaerator, and low pressure heater of FIG. 1.
Fig. 4 is an enlarged view of a portion of the boiler of fig. 1.
Reference numerals: 1-a combustion boiler, 2-a generator, 3-an economizer, 4-an air preheater, 5-a low-pressure heater, 6-a thermal deaerator, 7-a boiler feed water pump, 8-a high-pressure heater, 9-a turbine high-pressure cylinder, 10-a turbine low-pressure cylinder, 11-a primary fan, 12-a secondary fan, 13-an induced draft fan, 14-a main dust remover, 15-a desulfurizing tower, 16-a pre-dust remover, 17-a shaft seal cooler, 18-a chimney, 19-a shaft seal cooler steam inlet pipe, 20-a desalting compensation water inlet pipe, 21-a high-temperature superheater, 22-a low-temperature superheater, 23-a reheater, 24-a condensing device, 25-a condensate pump, 26-a slag bin, 27-a low water feeding pump and 28-a swing combustor, 29-wall reheater, 30-evaporation water wall, 31-nozzle, 32-actuator.
Detailed Description
The invention will be further elucidated below on the basis of a specific embodiment.
The ultrahigh-pressure once-reheat power generation system shown in fig. 1-4 comprises a steam turbine and a combustion boiler 1, wherein the combustion boiler 1 can adopt various combustion type boilers such as a pulverized coal furnace, a circulating fluidized bed boiler, a grate furnace and the like, in the embodiment, the combustion boiler 1 adopts the pulverized coal furnace, the steam turbine is connected with a power generator 2, the steam turbine comprises a steam turbine high-pressure cylinder 9 and a steam turbine low-pressure cylinder 10, an evaporation water-cooling wall 30, a swing combustor 28, a wall-type reheater 29, a high-temperature superheater 21, a low-temperature superheater 22, a reheater 23, an economizer 3 and an air preheater 4 are arranged in the combustion boiler 1, the air preheater 4 is connected with a primary fan 11 and a secondary fan 12, and a bottom flue of the combustion boiler 1 is sequentially connected with a main dust collector 14;
a steam inlet of the steam turbine high-pressure cylinder 9 is connected with a steam outlet of the high-temperature superheater 21, a steam outlet of the steam turbine high-pressure cylinder 9 is connected with a reheater 23 and a steam inlet of the high-pressure heater 8, and a steam outlet of the reheater 23 is connected with a steam inlet of the steam turbine low-pressure cylinder 10;
the steam outlet of the steam turbine low-pressure cylinder 10 is connected with the steam inlets of a condensing device 24, a low-pressure heater 5 and a thermal deaerator 6, and the condensing device 24 is sequentially connected with a condensate pump 25, a shaft seal cooler 17, the low-pressure heater 5, the thermal deaerator 6, a boiler feed water pump 7, a high-pressure heater 8 and an economizer 3;
be provided with on the bearing seal cooler 17 and be used for collecting the bearing seal cooler admission pipe 19 of steam turbine bearing seal steam leakage, the shaft seal cooling water export of bearing seal cooler 17 still is connected with condensing equipment 24's shaft seal cooling water import, and the hydrophobic import of thermal power oxygen-eliminating device 6 is connected with high pressure heater 8's hydrophobic export, and thermal power oxygen-eliminating device 6 still is connected with the desalination compensating water inlet tube 20 that is used for supplementing the desalination compensating water.
As shown in fig. 2, the oscillating burner 28 is provided with an angularly adjustable nozzle 31 and an actuator 32 for adjusting the angle of the nozzle 31. The actuator 32 is a servo motor, and the motor drives the nozzle 31 to adjust the spraying angle. In the combustion boiler 1, the swing burner 28 is adopted to adjust the outlet temperature of the reheater 23, and the water spraying temperature reduction is used for fine adjustment of the steam temperature and the accident condition. The hearth adopts the tangentially arranged swinging burner 28, and primary air and secondary air can swing up and down in the thermal state operation. The swinging of the nozzle is realized by an actuating mechanism which can feed back an electric signal, the actuating mechanism has enough moment, the swinging of the burner can be flexible, four corners are synchronous, and a swinging angle indicating mark is arranged on the swinging burner 28.
The length and width of the furnace of the combustion boiler 1 using the oscillating burner 28 and the volumetric and cross-sectional heat loads of the furnace are accurately accounted for, and the number of layers of burners and the pitch of each layer are arranged.
The combustion boiler 1 is not only provided with the evaporating water-cooling wall 30 in the hearth, but also is creatively provided with the wall-type reheater 29 in the hearth, so that the reheater is separately arranged in the hearth and the tail flue, the heat is rebalanced, and the requirement of stable outlet temperature of the reheater is met.
The condensing equipment 24 adopts an air cooling island or a water cooling condenser, and in this embodiment, the condensing equipment 24 adopts an air cooling island.
The bottom of the combustion boiler 1 is provided with a slag bin 26.
The combustion boiler 1 is one of a circulating fluidized bed boiler, a pulverized coal furnace, a grate furnace or a grate furnace, and the circulating fluidized bed boiler is used in this embodiment.
The combustion boiler 1 uses one or more of coal, garbage, biomass or solid waste as fuel, and in this embodiment, is a coal-fired boiler. In other embodiments of the present invention, the above fuels can also be mixed as fuel.
The combustion boiler 1 is a small combustion boiler applied to a scale grade below a 50MW turbo generator set.
The working process of the system is as follows:
the fuel in the combustion boiler 1 burns to produce high-temperature flue gas and slag, and the slag falls into the bottom of the combustion boiler 1 and falls into the slag bin 26 for storage. High-temperature flue gas generated after combustion of fuel and air in a hearth of the combustion boiler 1 is subjected to heat exchange sequentially by a high-temperature superheater 21, a low-temperature superheater 22, a reheater 23, an economizer 3 and an air preheater 4 under the action of an induced draft fan 13, then passes through a pre-dust collector 16, a desulfurizing tower 15, a main dust collector 14 and the induced draft fan 13, and finally is discharged into the atmosphere through a chimney 18. The air preheater 4 comprises a primary air preheater and a secondary air preheater, a primary fan 11 is connected with the primary air preheater and provides primary hot air, a secondary fan 12 is connected with the secondary air preheater and provides secondary hot air, and the primary air and the secondary air are preheated by high-temperature flue gas when passing through the air preheater 4 and then enter a hearth for fuel combustion.
Boiler feed water is heated in the economizer 3, saturated steam enters an inlet of the low-temperature superheater 22, the heated steam enters an inlet of the high-temperature superheater 21, and superheated steam heated by the heat enters the high-pressure steam turbine cylinder 9. The exhaust steam of the high-pressure turbine cylinder 9 enters a reheater 23 of the combustion boiler 1, the reheater 23 is communicated with a wall-type reheater 29, the exhaust steam is continuously heated by the reheater 23 and the wall-type reheater 29 and finally enters the low-pressure turbine cylinder 10, and the high-pressure turbine cylinder 9 and the low-pressure turbine cylinder 10 push the turbine to do work together to drive the generator 2 to generate electricity. The steam pressure in the high pressure turbine cylinder 9 after work expansion is reduced, part of the steam enters the high pressure heater 8, and the rest of the steam returns to the reheater 23 to continue heating.
Steam after work expansion of the steam turbine low pressure cylinder 10 enters a condensing device 24, condensed water discharged from the condensing device 24 enters a shaft seal cooler 17 under the action of a condensed water pump 25, a steam inlet pipe 19 of the shaft seal cooler collects shaft seal leakage steam of the steam turbine and enters the shaft seal cooler 17 to be cooled by the condensed water, one part of finally formed condensed water in the shaft seal cooler 17 returns to the condensing device 24 to be used as condensed water, and the other part of finally formed condensed water enters a low pressure heater 5.
The low-pressure heater 5 is used for preheating the condensed water, and high-temperature low-pressure extracted steam from a steam extraction port of the steam turbine low-pressure cylinder 10 enters the low-pressure heater 5 to heat the condensed water. In this embodiment, low temperature heating ware 5 divides into threely, the high temperature steam pipeline of each level heater all with the steam turbine low pressure jar 10 connection, the high temperature low pressure of doing the work in the steam turbine low pressure jar 10 is taken out the vapour and is got into each level heater respectively, the comdenstion water in the condensate water pipeline is heated, the comdenstion water is carried step by step from first order heater to third level heater, through low filler pump 27 pump sending comdenstion water between first order heater and the second level heater, the comdenstion water is heated the back step by step, get into thermal power oxygen-eliminating device 6.
The desalting compensation water inlet pipe 20 supplies desalting compensation water to the thermal deaerator 6 in real time, and in the thermal deaerator 6, the amount of gas dissolved in water is in direct proportion to the partial pressure of gas on the water surface. The water supply is heated by steam to raise the temperature of water, so that the partial pressure of steam on the water surface is gradually increased, the partial pressure of dissolved gas is gradually reduced, the gas dissolved in water can continuously escape, when the water is heated to the boiling temperature under the corresponding pressure, all the water surface is the steam, the partial pressure of the dissolved gas is zero, and the water no longer has the capacity of dissolving gas, namely, the gas dissolved in the water, including oxygen, can be removed. The condensed water passing through the thermal deaerator 6 is sent to the high-pressure heater 8 as boiler feed water under the action of the combustion boiler feed water pump 7.
The high-pressure heater 8 is used for heating boiler feed water, and high-temperature and high-pressure air extracted from a high-pressure cylinder 9 of the steam turbine enters the high-pressure heater 8 to heat the boiler feed water from the thermal deaerator 6. In this embodiment, the high pressure heater is divided into two stages, each stage of the heater is connected to the high pressure turbine cylinder 9, the high temperature and high pressure steam which has done work in the high pressure turbine cylinder 9 enters the two stages of the heaters, and the heated water becomes the boiler feed water of the combustion boiler 1. Boiler feed water sequentially passes through the first-stage heater and the second-stage heater, is further heated by the part of exhaust steam entering the high-pressure heater 8 from the high-pressure cylinder 9 of the steam turbine, and finally enters the economizer 3 of the combustion boiler 1 to complete thermodynamic cycle.
The utility model discloses a system can adopt the mode of reheat once with the steam of superhigh pressure high temperature, is applied to in the small-size coal fired power plant of below 50MW, has improved the overall efficiency of power station, has reduced fuel consumption, has reduced production running cost.
The above is only the preferred embodiment of the present invention, but the present invention is not limited to the above-mentioned specific embodiments, and for those skilled in the art, a plurality of modifications and improvements can be made without departing from the inventive concept of the present invention, and these modifications and improvements all belong to the protection scope of the present invention.
Claims (8)
1. The utility model provides an ultrahigh pressure once reheat power generation system, includes steam turbine and combustion boiler (1), the steam turbine is connected with generator (2), the steam turbine includes steam turbine high pressure cylinder (9) and steam turbine low pressure cylinder (10), characterized by, be provided with evaporation water wall (30), swing combustor (28), wall reheater (29), high temperature superheater (21), low temperature superheater (22), reheater (23), economizer (3), air heater (4) in combustion boiler (1), air heater (4) are connected with primary air fan (11) and secondary air fan (12), the flue outlet of combustion boiler (1) connects gradually in advance dust catcher (16), desulfurizing tower (15), main dust remover (14), draught fan (13) and chimney (18);
the steam inlet of the high-temperature steam turbine cylinder (9) is connected with the steam outlet of the high-temperature superheater (21), the steam outlet of the high-temperature steam turbine cylinder (9) is connected with the reheater (23) and the steam inlet of the high-pressure heater (8), and the steam outlet of the reheater (23) is connected with the steam inlet of the low-temperature steam turbine cylinder (10);
the steam outlet of the steam turbine low-pressure cylinder (10) is connected with the steam inlets of a condensing device (24), a low-pressure heater (5) and a thermal deaerator (6), and the condensing device (24) is sequentially connected with a condensate pump (25), a shaft seal cooler (17), the low-pressure heater (5), the thermal deaerator (6), a boiler feed water pump (7), a high-pressure heater (8) and an economizer (3);
the steam turbine shaft seal cooling system is characterized in that a shaft seal cooling device steam inlet pipe (19) used for collecting steam turbine shaft seal leakage is arranged on the shaft seal cooling device (17), a shaft seal cooling water outlet of the shaft seal cooling device (17) is connected with a shaft seal cooling water inlet of the condensing device (24), a drainage inlet of the thermal deaerator (6) is connected with a drainage outlet of the high-pressure heater (8), and the thermal deaerator (6) is further connected with a desalting compensation water inlet pipe (20) used for supplementing desalting compensation water.
2. The system as claimed in claim 1, wherein the oscillating burner (28) is provided with an angularly adjustable nozzle (31) and an actuator (32) for adjusting the angle of the nozzle (31).
3. The uhp-reheat power generation system of claim 2 wherein the actuator (32) is a servo motor.
4. The system according to claim 1, wherein the condensing unit (24) is an air cooling island or a water cooling condenser.
5. The system for generating electricity by ultra-high pressure single reheat as claimed in claim 1, wherein a slag bin (26) is provided at the bottom of the combustion boiler (1).
6. The uhp-reheat power generation system of claim 1, wherein the combustion boiler (1) is one of a circulating fluidized bed boiler, a pulverized coal furnace, a grate furnace or a stoker furnace.
7. The system for generating electricity by ultra-high pressure and single reheat as claimed in claim 1, wherein the combustion boiler (1) is fueled by one or more of coal, garbage, biomass or solid waste.
8. The uhp single reheat power generation system of claim 1, wherein the combustion boiler (1) is a small combustion boiler applied to a scale level below 50MW turbo generator set.
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| CN202020678840.4U CN212481236U (en) | 2020-04-28 | 2020-04-28 | Ultrahigh-pressure once-reheating power generation system |
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| CN202020678840.4U CN212481236U (en) | 2020-04-28 | 2020-04-28 | Ultrahigh-pressure once-reheating power generation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111473314A (en) * | 2020-04-28 | 2020-07-31 | 中材节能股份有限公司 | Ultrahigh-pressure once-reheating power generation system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111473314A (en) * | 2020-04-28 | 2020-07-31 | 中材节能股份有限公司 | Ultrahigh-pressure once-reheating power generation system |
| CN111473314B (en) * | 2020-04-28 | 2024-05-24 | 中材节能股份有限公司 | Ultrahigh-pressure one-time reheating power generation system |
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