CN214119996U - Direct air cooling cogeneration unit peak regulation system based on heat accumulation jar - Google Patents
Direct air cooling cogeneration unit peak regulation system based on heat accumulation jar Download PDFInfo
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- CN214119996U CN214119996U CN202022959837.2U CN202022959837U CN214119996U CN 214119996 U CN214119996 U CN 214119996U CN 202022959837 U CN202022959837 U CN 202022959837U CN 214119996 U CN214119996 U CN 214119996U
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Abstract
The utility model provides a peak shaving system of a direct air cooling cogeneration unit based on a heat storage tank, which comprises a boiler, a steam turbine, a direct air cooling radiator, an exhaust device, a heat exchanger and a heat storage tank; the steam output end of the boiler is connected with the input end of a steam turbine, the steam output end of the steam turbine is respectively connected with the input end of a direct air-cooling radiator and one input end of a heat exchanger through pipelines, the condensed water output end of the direct air-cooling radiator and one output end of the heat exchanger are both connected with the input end of an exhaust device through pipelines, and the output end of the exhaust device is connected with the input end of the boiler through an inlet pipeline; the other input end of the heat storage tank is connected with the other input end of the heat exchanger through a cold water pipeline, and the other output end of the heat exchanger is connected with the heat storage tank through a hot water pipeline; the hot water pipeline is connected with the inlet pipeline through a first branch, and the cold water pipeline is connected with the inlet pipeline through a second branch. The peak regulation system can reduce the backpressure of the unit when the environmental temperature is high in summer, improve the output of the unit, realize the peak regulation operation in winter for the direct air-cooling cogeneration unit, and further improve the economical efficiency of the unit.
Description
Technical Field
The utility model belongs to the technical field of direct air cooling combined heat and power units, concretely relates to peak shaving system of direct air cooling combined heat and power units based on heat accumulation jar.
Background
The cooling mode of the steam turbine exhaust of the thermal power plant comprises a wet cooling mode and an air cooling mode, the air cooling mode is mainly adopted in northern water shortage areas, an air cooling system generally directly cools the steam turbine exhaust by air or indirectly cools the steam turbine exhaust by air cooling circulating water to form a closed system, and the closed system has no water consumption loss of wet circulating cooling water, so that the total water consumption of the whole plant of the power plant is reduced by about 80%. The direct air cooling system is easily affected by environmental conditions, when the environmental temperature is high, the backpressure of the unit is increased more, and when the environmental wind speed is higher, the backpressure of the direct air cooling system can be increased sharply under the condition of strong wind. In recent years, the design backpressure of the direct air cooling unit is generally 11-13kPa, and the backpressure in summer is about 30-35 kPa. However, in the actual operation process, the power requirement of the power grid company is met, when the environmental temperature is high in summer, the power load is generally higher, the unit needs to operate with high output in a short time, generally more than 90% of load, even full load operation is needed, however, the environmental temperature is higher in 7 and 8 months, the steam temperature can reach more than 33 ℃ in a short time in the daytime, at the moment, the direct air cooling unit is influenced by the heat dissipation area of a cooler and the cleaning coefficient of the cooler, high back pressure (more than 35 kPa) operation can occur, load limiting operation can occur in a plurality of units, the assessment of the power grid company is further caused, the coal consumption is very high under the high back pressure, and the operation efficiency is poor. In addition, along with the increase of the requirement of clean heating, a plurality of direct air-cooling generator sets are transformed into a cogeneration unit, and meanwhile, in order to reduce the coal consumption in the heating period and improve the heating economy of the unit, a plurality of power plants perform waste steam and waste heat utilization transformation on the direct air-cooling heating unit, a high-back-pressure heat supply network condenser is connected in parallel to the direct air-cooling condenser and used for recovering the waste steam of the unit in the heating period (the back pressure runs about 35 kPa).
At present, when summer peak load operation that direct air cooling unit was in, some units can carry out peak cooling system and reform transform to reduce the backpressure, common means have: peak spray cooling, external peak cooling systems (evaporative coolers, surface coolers); the peak spraying is mainly characterized in that high-pressure demineralized water is atomized through a nozzle and then sprayed into air at the inlet of a radiator to achieve the purpose of reducing the air temperature, but the method is limited by environmental conditions, the surface fouling of the air-cooled radiator is easily caused, the aging phenomenon occurs for a long time, an external peak cooling system needs to be additionally provided with a heat exchanger and a cooling device (an evaporative cooler and a surface cooler), the system is large in investment, needs to occupy a large land area, and is relatively complex.
Disclosure of Invention
For overcoming the not enough of prior art, the utility model provides a peak shaving system of direct air cooling cogeneration unit based on heat accumulation jar not only can reduce the unit backpressure when ambient temperature is high in summer, improves the unit and exert oneself, has realized winter peak shaving operation to direct air cooling cogeneration unit simultaneously, and then has improved the economic nature of unit.
The utility model aims at realizing through the following technical scheme:
a peak shaving system of a direct air-cooling cogeneration unit based on a heat storage tank comprises a boiler, a steam turbine, a direct air-cooling radiator, an exhaust device, a heat exchanger and the heat storage tank; the steam output end of the boiler is connected with the input end of a steam turbine, the steam output end of the steam turbine is respectively connected with the input end of a direct air-cooling radiator and one input end of a heat exchanger through pipelines, the condensed water output end of the direct air-cooling radiator and one output end of the heat exchanger are both connected with the input end of an exhaust device through pipelines, and the output end of the exhaust device is connected with the input end of the boiler through an inlet pipeline; the other input end of the heat storage tank is connected with the other input end of the heat exchanger through a cold water pipeline, and the other output end of the heat exchanger is connected with the heat storage tank through a hot water pipeline; the hot water pipeline is connected with the inlet pipeline through a first branch provided with a hot water booster pump, and the cold water pipeline is connected with the inlet pipeline through a second branch.
Furthermore, a condensate pump, a low-pressure heater and a high-pressure heater are sequentially arranged on an inlet pipeline between the exhaust device and the input end of the boiler; the condensate pump is arranged at the position close to the output end of the exhaust device, and the high-pressure heater is arranged at the position close to the input end of the boiler.
Furthermore, the connection penetrating part of the first branch and the inlet pipeline is arranged between the low-pressure heater and the high-pressure heater; and the connection penetrating part of the second branch and the inlet pipeline is arranged between the condensate pump and the low-pressure heater.
Furthermore, the hot water pipeline, the cold water pipeline, the first branch and the second branch are all provided with regulating valves, the inlet pipeline between the joint of the second branch and the inlet pipeline and the low-pressure heater is also provided with a regulating valve, and the cold water pipeline is provided with a cold water booster pump.
Further, the heat exchanger is a surface heat exchanger.
The utility model has the advantages that: the utility model discloses a direct air cooling cogeneration unit peak regulation system based on heat accumulation jar can improve the unit and exert oneself at the high unit backpressure that reduces of summer ambient temperature, has realized to direct air cooling cogeneration unit that winter can the degree of depth peak regulation operation, can satisfy the operation of exerting oneself summer.
According to the invention, by utilizing the heat storage performance of the heat storage tank and the heat return performance of the direct air-cooling cogeneration unit, when the ambient temperature is high and the running backpressure of the direct air-cooling unit reaches above 35kPa, the exhaust steam temperature is about 72 ℃, the exhaust steam heat of the direct air-cooling unit is stored into the heat storage tank through the surface heat exchanger, so that the heat entering the direct air-cooling radiator is shared, the effect of reducing the backpressure of the unit or improving the output of the unit is achieved, and the heat storage tank has good economic benefit; when the environmental temperature is low and the load is reduced, carrying out heat replacement on the heat storage tank, leading hot water in the heat storage tank to an inlet pipeline through a first branch by a hot water booster pump, then leading the hot water into a boiler, leading outlet water of a condensate pump to a cold water pipeline through a second branch, storing condensed water at 50 ℃ into a heat storage tank 7, maintaining the water temperature in the heat storage tank at 50 ℃ through the heat and cold water replacement, and starting a heat release system of the heat storage tank again when the environmental temperature is increased to be higher than 33 ℃ next time so as to circulate; the heat storage tank 7 becomes a peak shaving operation cooling system of a direct air cooling unit.
Passing 10000m3The heat storage tank serves as a peak cooling system, a 300MW unit is taken as an example, when the ambient temperature is 33 ℃, the backpressure of the 300MW working condition unit is 35kPa, the heat storage tank can share 18% of heat load, the backpressure of the unit can be reduced by 5kPa, the coal consumption of the unit for power supply is reduced by about 7.5g/kW.h, the cooling system can operate for 3 hours every day, the fuel cost can be saved by about 3300 yuan/day, in addition, when the ambient temperature is higher, and the load carrying capacity of the unit is limited, the load carrying capacity of the unit can be improved by 10%, namely the load carrying capacity can be increased by 30MW, and the assessment of a power grid company can be reduced.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, a peak shaving system of a heat storage tank-based direct air-cooling cogeneration unit comprises a boiler 1, a steam turbine 2, a direct air-cooling radiator 3, an exhaust device 4, a heat exchanger 5 and a heat storage tank 7, wherein the heat exchanger is a surface heat exchanger, and the exhaust device is a conventional existing device for exhausting waste gas and cooling; the steam output end of the boiler 1 is connected with the input end of a steam turbine 2, the steam output end of the steam turbine 2 is respectively connected with the input end of a direct air-cooling radiator 3 and one input end of a heat exchanger 5 through pipelines, the condensed water output end of the direct air-cooling radiator 3 and one output end of the heat exchanger 5 are both connected with the input end of an exhaust device 4 through pipelines, and the output end of the exhaust device 4 is connected with the input end of the boiler 1 through an inlet pipeline 6; the heat storage tank 7 is connected with the other input end of the heat exchanger 5 through a cold water pipeline 8, and the other output end of the heat exchanger 5 is connected with the heat storage tank 7 through a hot water pipeline 9; the hot water pipeline 9 is connected with the inlet pipeline through a first branch 10 provided with a hot water booster pump 15, the cold water pipeline 8 is connected with the inlet pipeline 6 through a second branch 11, and the hot water pipeline 9, the cold water pipeline 8, the first branch 10 and the second branch 11 are all provided with regulating valves.
A condensate pump 14, a low-pressure heater 12 and a high-pressure heater 13 are sequentially arranged on the inlet pipeline 6 between the exhaust device and the input end of the boiler; the condensate pump 14 is arranged at a position close to the output end of the exhaust device 4, and the high-pressure heater 13 is arranged at a position close to the input end of the boiler 1; the connection penetrating part of the first branch 10 and the inlet pipeline 6 is arranged between the low-pressure heater 12 and the high-pressure heater 13; the connection penetrating part of the second branch 11 and the inlet pipeline 6 is arranged between the condensate pump 14 and the low-pressure heater 12; an adjusting valve is also arranged on the inlet pipeline 6 between the joint of the second branch 10 and the inlet pipeline 6 and the low-pressure heater 12, and a cold water booster pump 16 is arranged on the cold water pipeline 8.
When the system works, high-temperature and high-pressure steam generated by the boiler 1 enters the steam turbine 2 to do work, steam discharged by the steam turbine 2 enters the direct air-cooling radiator 3, condensed water obtained by condensation enters the exhaust device 4, is boosted to the low-pressure heater 12 through the condensed water pump 14, and then further enters the boiler 1 through the high-pressure heater 13; when the environmental temperature is high, 50 ℃ water stored in the heat storage tank 7 enters the heat exchanger 5 through the cold water booster pump 16 to recover the waste heat of the exhaust steam of the steam turbine, when the temperature is raised to 72 ℃, the water enters the heat storage tank 7 through the hot water pipeline 9 to store heat, through the replacement process, the water temperature in the heat storage tank 7 is maintained at 72 ℃, the process can share the heat load of the direct air cooling radiator 3, the backpressure of the unit is further reduced, and the load carrying capacity of the unit is improved. When the ambient temperature is low and the load is reduced at night, carrying out heat replacement on the heat storage tank 7, leading hot water in the heat storage tank 7 to the inlet pipeline 6 through the first branch 10 by the hot water booster pump 15, then leading the hot water into the boiler 1, leading outlet water of the condensate pump 14 to the cold water pipeline 8 of the heat storage tank 7 through the second branch 11, storing the 50 ℃ condensate water into the heat storage tank 7, maintaining the water temperature in the heat storage tank 7 at 50 ℃ through the heat and cold water replacement, and starting the heat release system of the heat storage tank 7 again when the ambient temperature is increased to be more than 33 ℃ next time so as to circulate; the heat storage tank 7 becomes a peak shaving operation cooling system of a direct air cooling unit.
In a volume of 10000m3Taking a heat storage tank as an example, the water temperature in the heat storage tank is 50 ℃, the area of a 300MW direct air cooling unit is 78 ten thousand meters2When the summer environment temperature is 33 ℃, the unit load is 300MW, the design backpressure is 35kPa, taking the working condition as an example, the exhaust backpressure of a steam turbine is 35kPa, the steam inlet quantity of a direct air cooling radiator is about 650t/h, and at the moment, 3000m of water with the temperature of 50 ℃ is led out from a heat storage tank3And h, pumping cold water into a heat exchanger connected with the direct air-cooling radiator in parallel by a pressure boosting pump, heating to 70-72 ℃, storing hot water at 72 ℃ for recovering the heat of the dead steam in a heat storage tank through a hot water pipeline, and replacing the hot water at 50 ℃ stored in the heat storage tank. The volume is 10000m3The water yield of the heat storage tank is 3000m3The heat can be stored for about 3.3 hours; under the operating condition, the heat load of the direct air-cooling radiator is reduced by 18 percent compared with the original heat load, the load capacity of the unit can be increased by about 10 percent, namely 30MW, or the back pressure of the unit is reduced by 5 kPa.
After 3 hours of operation, the heat storage tank is completely filled with heat, the heat storage temperature reaches 68-72 ℃, the heat storage capacity of the heat storage tank is reached, the peak cooling system of the heat storage tank is withdrawn from operation, the direct air cooling unit maintains the original operation mode, after the environmental temperature is reduced, the unit load is lower than 60% generally at night due to the operation requirement of power grid peak shaving, the unit steam discharge pressure is lower than 15kPa, the unit condensation water temperature can be lower than 50 ℃, at the moment, the condensation water is led to a cold water pipeline of the heat storage tank through a second branch, the water at 50 ℃ is led to the heat storage tank, the hot water at 68-70 ℃ in the heat storage tank is led to the outlet of a low-pressure heater of a heat recovery system of the unit through a first branch and is used for squeezing low-pressure steam extraction, the economic efficiency of the unit is further improved, the operation time is about 8 hours per hour, the hot water in the heat storage tank can be replaced by 50%, therefore, the heat storage tank can be operated at low load every two nights, the water in the heat storage tank is replaced to 50 ℃ again, and the peak cooling system of the heat storage tank can be operated when the ambient temperature is higher than 33 ℃ next time.
The above description has been made in detail only for the preferred embodiment of the present invention, but the present invention is not limited to the above embodiment, and various changes can be made without departing from the spirit of the present invention within the knowledge scope of those skilled in the art, and all such changes are intended to be encompassed by the present invention.
Claims (5)
1. A peak shaving system of a direct air-cooling cogeneration unit based on a heat storage tank is characterized by comprising a boiler, a steam turbine, a direct air-cooling radiator, an exhaust device, a heat exchanger and the heat storage tank; the steam output end of the boiler is connected with the input end of a steam turbine, the steam output end of the steam turbine is respectively connected with the input end of a direct air-cooling radiator and one input end of a heat exchanger through pipelines, the condensed water output end of the direct air-cooling radiator and one output end of the heat exchanger are both connected with the input end of an exhaust device through pipelines, and the output end of the exhaust device is connected with the input end of the boiler through an inlet pipeline; the other input end of the heat storage tank is connected with the other input end of the heat exchanger through a cold water pipeline, and the other output end of the heat exchanger is connected with the heat storage tank through a hot water pipeline; the hot water pipeline is connected with the inlet pipeline through a first branch provided with a hot water booster pump, and the cold water pipeline is connected with the inlet pipeline through a second branch.
2. The peak shaving system of the direct air-cooling cogeneration unit based on the heat storage tank as claimed in claim 1, wherein a condensate pump, a low pressure heater and a high pressure heater are sequentially arranged on an inlet pipeline between the exhaust device and the input end of the boiler; the condensate pump is arranged at the position close to the output end of the exhaust device, and the high-pressure heater is arranged at the position close to the input end of the boiler.
3. The peak shaving system of the heat storage tank-based direct air-cooling cogeneration unit according to claim 2, wherein the connection through between the first branch and the inlet pipeline is arranged between the low-pressure heater and the high-pressure heater; and the connection penetrating part of the second branch and the inlet pipeline is arranged between the condensate pump and the low-pressure heater.
4. The peak shaving system of the direct air-cooling cogeneration unit based on the heat storage tank as claimed in claim 2, wherein the hot water pipeline, the cold water pipeline, the first branch and the second branch are all provided with regulating valves, an inlet pipeline between the junction of the second branch and the inlet pipeline and the low-pressure heater is also provided with a regulating valve, and a cold water booster pump is arranged on the cold water pipeline.
5. The direct air-cooled cogeneration unit peak shaving system based on a heat storage tank of claim 1, wherein said heat exchanger is a surface heat exchanger.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022959837.2U CN214119996U (en) | 2020-12-11 | 2020-12-11 | Direct air cooling cogeneration unit peak regulation system based on heat accumulation jar |
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| CN202022959837.2U CN214119996U (en) | 2020-12-11 | 2020-12-11 | Direct air cooling cogeneration unit peak regulation system based on heat accumulation jar |
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