CN214120820U - Device suitable for operation of indirect air cooling unit peak load reduction backpressure - Google Patents
Device suitable for operation of indirect air cooling unit peak load reduction backpressure Download PDFInfo
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- CN214120820U CN214120820U CN202023012546.9U CN202023012546U CN214120820U CN 214120820 U CN214120820 U CN 214120820U CN 202023012546 U CN202023012546 U CN 202023012546U CN 214120820 U CN214120820 U CN 214120820U
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Abstract
The utility model relates to a device suitable for reducing back pressure operation of peak load of an indirect air cooling unit, which comprises a condenser, an indirect air cooling tower and a peak cooling device, wherein the peak cooling system comprises a heat storage tank, a heat storage water inlet pump, a heat storage water outlet pump, a heat dissipation water inlet pump and a heat dissipation water outlet pump, the water inlet end of the heat storage water inlet pump and the water outlet end of the heat dissipation water outlet pump are respectively connected to a branch of a condensed water outlet pipe of the condenser, the water outlet end of the heat storage water inlet pump and the water inlet end of the heat dissipation water inlet pump are connected to the water inlet of the heat storage tank, a pipeline of the water outlet of the heat storage tank is divided into two pipelines which are respectively connected with the water outlet end of the heat dissipation water inlet pump and the water inlet end of the heat storage water outlet pump, the device for reducing back pressure operation can be higher in ambient temperature, and when the load capacity of the unit is limited, the load capacity of the unit is improved.
Description
Technical Field
The utility model relates to an indirect air cooling unit technical field, more specifically say, relate to a device suitable for indirect air cooling unit peak load reduces the operation of backpressure.
Background
The cooling mode of the steam turbine exhaust of the thermal power plant comprises a wet cooling mode (a wet cooling system for short) and an air cooling mode (an air cooling system for short), and in northern water-deficient areas, the air cooling mode is mainly adopted, and the air cooling system generally directly cools the steam turbine exhaust by using air or indirectly cools the steam turbine exhaust by using air cooling circulating water to form a closed system, so that the water consumption loss of wet circulating cooling water is theoretically avoided, and the total water consumption of the whole plant of the power plant is reduced by about 80%. The early air cooling units mainly adopt direct air cooling systems, and in recent years, indirect air cooling systems are more and more widely applied, and the indirect air cooling systems are divided into two systems with surface condensers (Hamon type) and hybrid condensers (Haylor type). The process flow of the mixed indirect air cooling system is that the steam turbine exhausts steam into the mixed condenser and directly contacts and cools with circulating water forming a water film in a condenser nozzle, a small part of mixed condensed water enters the system as condensed water, and the rest condensed water is pressurized by a circulating water pump to an air cooling tower for cooling and then is recycled. The surface condensing indirect air cooling system is basically the same as a conventional wet cooling system, and is different from the conventional wet cooling system in that the wet cooling tower is replaced by the air cooling tower, the process flow is that steam is discharged by a steam turbine into a surface condenser, the steam is subjected to heat exchange with circulating water and then is boosted by a condensate pump to return to a thermodynamic system, and the circulating water subjected to heat exchange is boosted by a circulating water pump to the air cooling tower for cooling and then is recycled.
At present, a mixed indirect air cooling system and a surface type indirect air cooling system both adopt a natural ventilation air cooling tower, an aluminum pipe aluminum fin radiator is arranged at an air inlet of the air cooling tower, a radiator cooling triangle is vertically arranged at an inlet at the bottom of the tower, the radiator is divided into a plurality of cooling sectors, each cooling sector is provided with an independent water inlet pipe, an independent water outlet pipe and an independent water outlet pipe, each cooling sector is composed of a plurality of groups of cooling triangles, each cooling triangle is provided with a shutter and an actuating mechanism, the cooling air flow of the cooling triangle is controlled by the shutter, and when the ambient temperature is low in winter, the anti-freezing effect is achieved by adjusting the opening degree of the shutter. The design air-cooling radiator of the indirect air-cooling unit is specified in GB 50660 & lt 2011 & gt design Specification for large-scale thermal power plants, the design air-cooling radiator area selection design temperature is calculated according to the hour dry bulb temperature in typical years, the design temperature is preferably determined according to a year weighted average method of more than 5 ℃, the design backpressure of the indirect air-cooling unit is generally 10-12kPa in recent years, and the summer backpressure is about 26-30 kPa. However, in the actual operation process, the requirement of power grid company scheduling is met, and when the ambient temperature of the indirect air-cooling generator set in summer is high, the indirect air-cooling generator set needs to be operated with high output, generally more than 90% of load, even full load operation is needed. 7. The gasification change can affect the installed output of renewable energy sources in 8 months, and further when the environmental temperature is more than 33 ℃ in summer, the coal-fired generating set needs to operate at full output or more than 90% load output, under the requirement, most indirect air-cooled generating sets can have high back pressure (more than 30 kPa) and even have limited load operation, and further cause the assessment of a power grid company, and the coal consumption is very high under the high back pressure, and the operation efficiency is poor.
At present, when summer peak load that indirect air cooling unit adopted, the means of reducing backpressure had: 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, surface fouling of the air-cooled radiator is easily caused, an external peak cooling system needs to additionally increase a heat exchanger and a cooling device (an evaporative cooler and a surface cooler), the system is large in investment and needs to occupy a large land area, and the system is relatively complex.
Disclosure of Invention
The utility model aims at providing a device suitable for operation of indirect air cooling unit peak load reduction backpressure solves current indirect air cooling generating set, and when ambient temperature was higher the operation, the unit backpressure was high, the coal consumption is high, and economic nature is poor, still can cause the unit to limit to exert oneself the operation when serious.
The utility model discloses the technical scheme who adopts does: a device suitable for reducing back pressure operation of peak load of an indirect air cooling unit comprises a condenser, an indirect air cooling tower and a peak cooling device, a condensed water outlet pipe of the condenser is connected with a water inlet of the indirect air cooling tower, a water outlet pipe of the indirect air cooling tower is connected with a condensed water inlet of the condenser, the peak cooling device comprises a heat storage tank, a heat storage water inlet pump, a heat storage water outlet pump, a heat dissipation water inlet pump and a heat dissipation water outlet pump, the water inlet end of the heat storage water inlet pump and the water outlet end of the heat dissipation water outlet pump are respectively connected to a branch of a condenser condensate water outlet pipe, the water outlet end of the heat storage water inlet pump and the water inlet end of the heat dissipation water inlet pump are connected to the water inlet of the heat storage tank, the pipeline of the water outlet of the heat storage tank is divided into two paths which are respectively connected with the water outlet end of the heat dissipation water inlet pump and the water inlet end of the heat storage water outlet pump, and the water inlet end of the heat dissipation water inlet pump and the water outlet end of the heat storage water outlet pump are respectively connected to the pipeline of the condensate water inlet of the condenser.
Preferably, the heat storage water inlet pump, the heat storage water outlet pump, the heat dissipation water inlet pump and the heat dissipation water outlet pump are provided with control valves at the two ends of the water inlet end and the water outlet end, so as to control the closing and the flow of the heat storage water inlet pump, the heat storage water outlet pump, the heat dissipation water inlet pump and the heat dissipation water outlet pump, and adjust according to the use condition.
Preferably, a circulating water pump is arranged on a condensed water outlet pipe of the condenser to adjust the circulating speed of the condensed water.
Preferably, the inflow water of the indirect air cooling tower is divided into the heat storage tank, the divided flow is 10% of the water flow of the circulating water pump, and an obvious cooling effect can be achieved.
The utility model discloses a device suitable for indirect air cooling unit peak load reduces backpressure operation, the heat accumulation jar is used for storing hot water;
under normal conditions, the steam turbine exhaust of the indirect air cooling unit enters a condenser, the steam turbine exhaust is cooled by circulating water, the circulating water enters a circulating water pump through a condenser water outlet pipe, the circulating water pump introduces the circulating water into an indirect air cooling tower for heat dissipation, the circulating water after heat dissipation returns to the condenser through an indirect air cooling tower water outlet pipe for heat absorption, and the steam turbine exhaust is cooled and then circulates.
When the environmental temperature is higher than 30 ℃, the peak load of the air cooling unit is carried out, a pipeline valve of a heat storage water inlet pump is opened, circulating water is shunted to a water inlet of a heat storage tank, the heat storage tank is charged with heat, a water outlet of water stored in the heat storage tank is led out to a water outlet pipe of a cooling tower through a heat storage water outlet pump to form closed circulation until the heat storage tank stores heat to the rated heat storage capacity so as to share the heat of an indirect air cooling tower and achieve the effect of reducing the water outlet temperature of the indirect air cooling tower, the back pressure of the unit is further reduced, when the heat storage tank stores heat to the rated heat storage capacity, a peak cooling system is withdrawn from operation, the indirect air cooling unit maintains the original operation mode, when the environmental temperature is reduced to 20 ℃, hot water in the heat storage tank enters the indirect air cooling tower through a heat release water outlet pump to dissipate heat, one way of the cooling tower is supplemented to the heat storage tank through the heat release water inlet pump to form closed circulation until all high-temperature water in the heat storage tank is replaced to the indirect air cooling tower, and closing the heat release water outlet pump, the heat release water inlet pump and the control valves at the two ends to restore the water temperature of the stored water in the heat storage tank to low temperature so as to serve as a peak cooling system to operate when the next ambient temperature is higher than 30 ℃.
Compared with the prior art, the utility model discloses the beneficial effect who has does:
the utility model provides a device suitable for indirect air cooling unit peak load reduces backpressure operation, through 10000m3The heat storage tank serves as a peak cooling system, a 350MW unit is taken as an example, when the ambient temperature is 30 ℃, the temperature of inlet water of a condenser is reduced to 48.5 ℃ from 51 ℃, the backpressure of the condenser is reduced by 3kPa, the load carrying capacity of the unit is increased by 8%, the coal consumption of power supply of the unit is reduced by about 5g/kW.h, the cooling system can operate for 2.5 hours every day, the fuel cost can be saved by about 2800 yuan/day, and 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 improvedThe load carrying capacity of the group.
Drawings
Fig. 1 is the utility model provides a pair of be applicable to the device structure sketch map of indirect air cooling unit peak load reduction backpressure operation.
In the figure: 1-a condenser, 2-an indirect air cooling tower, 3-a heat storage tank, 4-a circulating water pump, 5-a heat storage water inlet pump, 6-a heat storage water outlet pump, 7-a heat dissipation water inlet pump, 8-a heat dissipation water outlet pump and 9-a control valve.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention;
as shown in fig. 1, a device suitable for peak load backpressure reduction operation of an indirect air cooling unit is characterized in that: the condenser comprises a condenser 1, an indirect air cooling tower 2 and a peak cooling device, wherein a condensed water outlet pipe of the condenser 1 is connected with a water inlet of the indirect air cooling tower 2, a water outlet pipe of the indirect air cooling tower 2 is connected with a condensed water inlet of the condenser 1, the peak cooling device comprises a heat storage tank 3, a heat storage water inlet pump 5, a heat storage water outlet pump 6, a heat dissipation water inlet pump 7 and a heat dissipation water outlet pump 8, the heat storage tank 3 is used for storing hot water, a water inlet end of the heat storage water inlet pump 5 and a water outlet end of the heat dissipation water outlet pump 7 are respectively connected to branches of the condensed water outlet pipe of the condenser 1, a circulating water pump 4 is arranged on the condensed water outlet pipe of the condenser 1, a water outlet end of the heat storage water inlet pump 5 and a water inlet end of the heat dissipation water inlet pump 7 are connected to a water inlet of the heat storage tank 3, a pipeline of a water outlet of the heat storage tank 3 is divided into two pipelines which are respectively connected with a water outlet end of the heat dissipation water inlet pump 7 and a water inlet end of the heat storage water outlet pump 6, the water inlet end of the heat dissipation water inlet pump 7 and the water outlet end of the heat storage water outlet pump 6 are respectively connected to a pipeline of a condensate water inlet of the condenser 1.
Preferably, the heat storage water inlet pump 5, the heat storage water outlet pump 6, the heat dissipation water inlet pump 7 and the heat dissipation water outlet pump 8 are provided with control valves 9 at the two ends of the water inlet end and the water outlet end for controlling the heat storage water inlet pump 5, the heat storage water outlet pump 6, the closing and the flow of the heat dissipation water inlet pump 7 and the heat dissipation water outlet pump 8, and the adjustment is performed according to the use condition.
Preferably, the inflow water of the indirect air cooling tower is divided into the heat storage tank, the divided flow is 10% of the water flow of the circulating water pump, and an obvious cooling effect can be achieved.
In specific implementation, when the ambient temperature is higher than 30 ℃, because the steam exhaust amount of the steam turbine is increased, the heat load of the condenser 1 is increased, the inlet water temperature of the indirect air cooling tower 2 is increased, namely the heat load of the indirect air cooling tower 2 is also increased, so that the outlet water temperature of the indirect air cooling tower 2 is also increased, in order to reduce the outlet water temperature of the indirect air cooling tower 2 and further reduce the back pressure of the condenser 1, partial heat of the circulating water in the indirect air cooling tower 2 needs to be transferred into the heat storage tank 3, the circulating water pump 4 leads the circulating water out to the inlet pipeline of the heat storage inlet pump 5, the inlet water of the indirect air cooling tower 2 is divided by 10% to the heat storage tank 3 through the heat storage inlet pump 5, the heat storage tank 3 is charged with heat, meanwhile, the stored water in the heat storage tank 3 is led out to the outlet pipe of the cooling tower through the heat storage outlet pump 6 to form closed circulation, until the heat storage tank 3 stores the heat to the rated capacity, the heat storage inlet pump 5 and the heat storage outlet pump 6 are closed, the control valves 9 at two ends of the heat storage inlet pump 5 and the heat storage outlet pump 6 are closed, the cycle running time is related to the capacity of the heat storage tank; after the peak load is passed, the ambient temperature is reduced to 20 ℃ at night, the heat dissipation water outlet pump 8 is started, the high-temperature water stored in the heat storage tank 3 is led to the water inlet pipe of the cooling tower, the high-temperature water is dissipated through the indirect air cooling tower 2, the water outlet pipe of the cooling tower is supplemented to the heat storage tank 3 through the heat dissipation water inlet pump 7 to form closed circulation, the heat dissipation water outlet pump 8 and the heat dissipation water inlet pump 7 are closed until all the high-temperature water in the heat storage tank 3 is replaced to the indirect air cooling tower 2, and the control valves 9 at two ends of the heat dissipation water outlet pump 8 and the heat dissipation water inlet pump 7 are closed.
In the present embodiment, the heat storage temperature in the heat storage tank 3 may reach 60 ℃.
The utility model discloses the requirement of make full use of thermal power generating unit flexibility peak shaving at present, when ambient temperature is higher, shift the partial heat of water in the indirect air cooling unit radiator to in the heat accumulation jar to share the heat of air cooling radiator, reach the effect that reduces air cooling radiator leaving water temperature, and then reduce the unit backpressure. In a volume of 10000m3Taking a heat storage tank as an example (the water temperature in the heat storage tank is 35 ℃), and when the environment temperature of a 350MW indirect air cooling unit is 30 ℃, the circulating water flow is 36000m3H, coolingThe inlet water temperature of the tower is 62.39 ℃, the outlet water temperature of the cooling tower is 51 ℃, and the unit backpressure is 26kPa when the unit load is 350 MW. Taking the working condition as an example, the temperature of the water of the cooling tower is 62.39 ℃, and the split flow is 3600m3And h, directly leading the water to a hot water inlet pipeline of the heat storage tank, replacing cold water at 35 ℃ stored in the heat storage tank, leading the cold water to a water outlet pipeline of the indirect air cooling tower, and forming a closed cycle. The temperature of inlet hot water of the heat storage tank is 62.39 ℃, the temperature of outlet water of the heat storage tank is 35 ℃, and the volume is 10000m3The water inflow of the heat storage tank is 3600m3The heat can be stored for about 2.78 hours; under the operating condition, the heat load of the indirect air cooling tower is reduced by 10 percent compared with the original heat load, the temperature of the water outlet of the cooling tower is reduced to 50 ℃, and after the water outlet of the indirect air cooling tower is mixed with the water with the temperature of 35 ℃ replaced from the heat storage tank, the temperature of the water at the inlet of the condenser can be reduced to 48.5 ℃, the temperature of the water is reduced by 2.5 ℃ compared with the original temperature of 51 ℃, the backpressure of a unit can be reduced by 3kPa, and meanwhile, the peak load can be maintained to operate for about 2.5 hours.
After 2.5 hours of operation, the heat storage tank is completely stored, the heat storage temperature reaches 60 ℃, 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 indirect air cooling unit maintains the original operation mode, when the ambient temperature is reduced to 20 ℃ at night, hot water in the heat storage tank is cooled through the indirect air cooling tower, the water storage temperature of the heat storage tank is recovered to 35 ℃, and the heat storage tank is used as the peak cooling system to operate when the ambient temperature is higher than 30 ℃ 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 (4)
1. A device suitable for peak load reduction back pressure operation of an indirect air cooling unit is characterized by comprising a condenser, an indirect air cooling tower and a peak cooling device, a condensed water outlet pipe of the condenser is connected with a water inlet of the indirect air cooling tower, a water outlet pipe of the indirect air cooling tower is connected with a condensed water inlet of the condenser, the peak cooling device comprises a heat storage tank, a heat storage water inlet pump, a heat storage water outlet pump, a heat dissipation water inlet pump and a heat dissipation water outlet pump, the water inlet end of the heat storage water inlet pump and the water outlet end of the heat dissipation water outlet pump are respectively connected to a branch of a condenser condensate water outlet pipe, the water outlet end of the heat storage water inlet pump and the water inlet end of the heat dissipation water inlet pump are connected to the water inlet of the heat storage tank, the pipeline of the water outlet of the heat storage tank is divided into two paths which are respectively connected with the water outlet end of the heat dissipation water inlet pump and the water inlet end of the heat storage water outlet pump, and the water inlet end of the heat dissipation water inlet pump and the water outlet end of the heat storage water outlet pump are respectively connected to the pipeline of the condensate water inlet of the condenser.
2. The device suitable for peak load operation with reduced back pressure of an indirect air cooling unit as claimed in claim 1, wherein the heat storage water inlet pump, the heat storage water outlet pump, the heat dissipation water inlet pump and the heat dissipation water outlet pump are provided with control valves at both ends of the water inlet end and the water outlet end.
3. The device suitable for the peak load reduction back pressure operation of the indirect air cooling unit according to claim 1, wherein a condensate water outlet pipe of the condenser is provided with a circulating water pump.
4. The device for peak load back pressure reduction operation of an indirect air cooling unit according to claim 1, wherein the feed water of the indirect air cooling tower is branched to the heat storage tank, and the branched flow is 10% of the flow rate of the circulating water pumped out.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023012546.9U CN214120820U (en) | 2020-12-15 | 2020-12-15 | Device suitable for operation of indirect air cooling unit peak load reduction backpressure |
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| CN202023012546.9U CN214120820U (en) | 2020-12-15 | 2020-12-15 | Device suitable for operation of indirect air cooling unit peak load reduction backpressure |
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| CN202023012546.9U Active CN214120820U (en) | 2020-12-15 | 2020-12-15 | Device suitable for operation of indirect air cooling unit peak load reduction backpressure |
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