CN215723469U - Heat-storage coupled cylinder-cutting combined heat and power unit - Google Patents
Heat-storage coupled cylinder-cutting combined heat and power unit Download PDFInfo
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- CN215723469U CN215723469U CN202121943243.0U CN202121943243U CN215723469U CN 215723469 U CN215723469 U CN 215723469U CN 202121943243 U CN202121943243 U CN 202121943243U CN 215723469 U CN215723469 U CN 215723469U
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Abstract
The utility model discloses a heat-storage coupling cylinder-cutting combined heat and power unit, which is based on a combined heat and power unit subjected to cylinder cutting transformation, wherein an extraction pipeline of a medium-low pressure communicating pipe is connected with a heat storage system, and the heat storage system is connected into a heat supply network circulating water system; the heat storage system comprises a heat storage heat exchanger, a heat storage device inlet valve and a heat storage device outlet valve, a steam inlet of the heat storage heat exchanger is connected with a low-pressure bypass pipeline and a steam extraction pipeline of a medium-low pressure communicating pipe, the heat storage heat exchanger is also connected with the heat storage device, the heat storage device is connected with a dividing wall type heat exchanger, the dividing wall type heat exchanger is connected with a mixed heat exchanger, and the heat storage heat exchanger is connected with the mixed heat exchanger; the heat storage coupling cylinder switching cooperative adjustment method provided by the utility model has the advantages that the upper limit of the thermoelectric ratio of the unit is increased, the thermoelectric operation domain of the unit is increased, the electric load adjustment capacity of the unit can be improved, and meanwhile, the heat supply capacity can be improved; based on the heat storage system coupling cylinder switching cooperative adjustment, the flexibility and the adjustment efficiency of the thermoelectric adjustment of the unit are greatly improved.
Description
Technical Field
The utility model belongs to the field of power station boilers and steam turbine systems, and particularly relates to a heat storage coupling cylinder-cutting combined heat and power unit.
Background
In order to cope with intermittence and fluctuation of resources such as wind, light and the like, the problem of wind and light abandonment in China is solved, the highest wind abandonment rate in China is more than 17% since 2010, and recently, the improvement target of 2.15 hundred million kilowatts of thermal power generating units is achieved. Under the background, a unit flexibility improving technology represented by low-load stable combustion of a boiler, zero output of a low-pressure cylinder of a steam turbine and the like is formed. At the moment, the load response rate of the thermal power generating unit is greatly reduced, and the response rate of a 20-30% load interval is reduced from 1.5% Pe/min to below 1.0% Pe/min.
Therefore, under the future high-frequency wide-load scene, how to further improve the electric load regulation capacity of the cylinder cutting unit, improve the heat supply capacity and increase the upper limit of the thermoelectric ratio regulation has important significance.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems in the prior art, the utility model provides a heat-storage coupling cylinder-cutting combined heat and power unit, which is characterized in that low-pressure cylinder near-zero output transformation is carried out on the unit, a heat storage system is additionally arranged, the heat storage system and the low-pressure cylinder near-zero output system are matched with each other to jointly adjust the thermoelectric load of a wet cooling unit, the electric load adjusting capacity of the unit is increased, the heat supply capacity is improved, the thermoelectric ratio adjusting upper limit is increased, the flexibility adjusting means and efficiency of the wet cooling unit are increased, and the energy-saving potential is huge.
In order to achieve the purpose, the utility model adopts the technical scheme that: a heat-storage coupling cylinder-cutting combined heat and power unit is based on a combined heat and power unit subjected to cylinder cutting transformation, wherein an extraction pipeline of a medium-low pressure communicating pipe is connected with a heat storage system, and the heat storage system is connected with a heat supply network circulating water system; the heat storage system comprises a heat storage heat exchanger, a heat storage device inlet valve and a heat storage device outlet valve, a steam inlet of the heat storage heat exchanger is connected with a steam extraction pipeline of the medium-low pressure communicating pipe, the heat storage heat exchanger is also connected with the heat storage device, the heat storage device is connected with a dividing wall type heat exchanger, the dividing wall type heat exchanger is connected with a mixed heat exchanger, and the heat storage heat exchanger is connected with the mixed heat exchanger.
And a valve, a temperature sensor and a pressure sensor are arranged on a steam pipeline from the steam extraction pipeline of the middle-low pressure communicating pipe to the heat storage system.
The steam extraction pipeline of the middle and low pressure communicating pipe is arranged in front of the valve of the communicating pipeline from the middle pressure cylinder to the low pressure cylinder.
The unit is a direct air cooling unit or a wet cooling unit.
The heat storage device comprises a cold area and a hot area, the hot area stores hot heat storage medium, the cold area stores cold heat storage medium, the heat storage medium of the cold area is stored in the hot area of the heat storage device after heat exchange and heat absorption with steam in the heat storage heat exchanger, the heat storage medium of the hot area releases heat in the dividing wall type heat exchanger to heat circulating water of a heat supply network and then returns to the cold area of the heat storage device, an inlet and an outlet of the hot area of the heat storage device are respectively and correspondingly communicated with an outlet of the heat medium of the heat storage heat exchanger and an inlet of the heat medium of the dividing wall type heat exchanger, and an outlet and an inlet of the cold area of the heat storage device are respectively and correspondingly communicated with an inlet of the medium to be heated of the heat storage heat exchanger and an outlet of the cold medium of the dividing wall type heat exchanger; the heat storage medium in the heat storage device is oil, water or molten salt.
And a connecting pipeline between the heat storage heat exchanger and the heat storage device is provided with a heat storage device inlet valve and a heat storage device outlet valve, and a connecting pipeline between the heat storage device and the dividing wall type heat exchanger is provided with a dividing wall type heat exchanger inlet valve and a dividing wall type heat exchanger outlet valve.
And valves, temperature sensors and pressure sensors are arranged on pipelines of the heat storage heat exchanger and the mixed heat exchanger.
A cooling steam bypass is arranged between the steam turbine intermediate pressure cylinder and the steam turbine low pressure cylinder, a cooling steam bypass regulating valve is arranged on the cooling steam bypass, and an intermediate pressure cylinder steam inlet regulating valve is arranged at the inlet of the steam turbine intermediate pressure cylinder.
Compared with the prior art, the utility model has at least the following beneficial effects:
compared with a simple low-pressure cylinder near-zero output adjusting system, the heat storage coupling cylinder switching cooperative adjusting method increases the adjusting upper limit of the thermoelectric ratio of the unit, increases the thermoelectric operation domain of the unit, can improve the electric load adjusting capacity of the unit, and can also improve the heat supply capacity; the heat storage device can store and release heat in real time, and compared with the mode that a pure low-pressure cylinder is used for adjusting heat supply with nearly zero output, the heat storage device is based on the heat storage system coupled with cylinder switching cooperative adjustment, so that the flexibility and the adjusting efficiency of thermoelectric adjustment of a unit are greatly improved; the heat storage coupling cylinder switching cooperative adjusting method is simple to operate, high in reliability, simple in system and high in usability.
Drawings
FIG. 1 is a schematic diagram of a flexibility adjusting system of a heat-storage coupling cylinder-switching combined heat and power air cooling unit of the utility model;
FIG. 2 is a schematic diagram of a flexibility adjusting system of a heat-storage coupling cylinder-switching combined heat and power wet cooling unit of the utility model;
FIG. 3 shows the thermoelectric ratio of the unit in example 2 after cylinder cutting with low-pressure cylinder near-zero output and heat storage coupling;
fig. 4 shows a thermoelectric operation domain of the unit heat storage coupled low-pressure cylinder with near-zero output in embodiment 2 of the present invention.
In the figure, 1, a boiler, 2, a turbine high-pressure cylinder, 3, a turbine medium-pressure cylinder, 4, a turbine low-pressure cylinder, 5, a medium-pressure cylinder steam inlet regulating valve, 6, a cooling steam bypass regulating valve, 7, a heat storage heat exchanger, 8, a high-pressure cylinder inlet regulating valve, 9, a butterfly valve, 10, a heat storage device inlet valve, 11, a heat storage device outlet valve, 12, an air cooling island fan, 13, an air cooling island, 14, a water feed pump, 15, a heat storage device, 16, a dividing wall type heat exchanger inlet valve, 17, a dividing wall type heat exchanger outlet valve, 18, a dividing wall type heat exchanger, 19, a mixed heat exchanger, 20, a water feed pump outlet valve, 21, a water feed pump inlet valve, 22, a condenser, 23, a water cooling tower, 24 and a circulating water pump.
Detailed Description
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, and it should be understood that the preferred embodiments described herein are merely for purposes of illustration and explanation and are not intended to limit the present invention.
Working example 1
The model NZK 600-24.2/5668/566 supercritical, one-time intermediate reheating, single shaft, three-cylinder four-steam-discharge and direct air-cooling condensing type steam turbine unit manufactured by certain east steam turbine company Limited has the advantages that when the THA working condition is adopted, the main steam pressure is 24.2MPa, the main steam temperature is 566 ℃, the reheating steam temperature is 566 ℃, the low-pressure cylinder steam inlet pressure is 1.06MPa, and the steam inlet enthalpy value is 3193.4 kJ/kg. In recent years, the installed capacity of photovoltaic and wind power of new energy is increased, and the photovoltaic and wind power and other new energy have the characteristics of intermittence and instability, so that the adjusting task of the thermal power generating unit is obvious. After the low-pressure cylinder zero-output transformation is carried out on the direct air cooling unit, the load response rate is greatly reduced, and the response rate in a 20-30% load interval is reduced from 1.5% Pe/min to below 1.0% Pe/min.
A flexibility adjusting system and method for a heat-storage coupling cylinder-switching combined heat and power unit are implemented on the direct air cooling unit, and a heat storage device, a heat storage heat exchanger and accessory equipment thereof are additionally arranged on the direct combined heat and power unit. The heat storage device is internally stored with heat storage media which are divided into a cold area and a hot area. The heat storage medium can be any heat storage medium, including water, oil, etc. The combined heat and power unit can cooperatively adjust the heat and power output of the unit through the heat storage system and the low-pressure cylinder near-zero output system, so that the electric load adjusting capacity of the unit is improved, the heat supply capacity is improved, and the upper limit of the thermoelectric ratio adjustment is increased. If the thermoelectric ratio required to be supplied by the combined heat and power unit is increased, the heat can be released through the heat storage device to return the circulating water of the heat supply network, the circulating water of the heat supply network enters the water mixing heater after being heated and is mixed with the extracted steam to be continuously heated, and then the heat is supplied to the outside so as to meet the heat utilization requirement of a user. If the thermoelectric ratio that the cogeneration unit needs to supply reduces, then can store unnecessary heat through heat-retaining device, heat-retaining device no longer supplies heat to the heat supply network circulating water this moment, heats in muddy water heater through drawing steam to satisfy user's heat demand. When the thermoelectric ratio that direct air cooling unit needs to supply fluctuates in certain extent, can store or release unnecessary heat through heat-retaining device to satisfy user's heat demand, compare in nearly zero power of pure low pressure cylinder, reduced the regulation number of times of unit, improved the security of cutting the direct air cooling unit operation of jar, increased the regulation upper limit of the thermoelectric ratio of direct air cooling unit, increased the thermoelectric operation area of unit, increased the electric load regulating power of unit, promote the heating capacity.
Referring to fig. 1, the operation mode of the flexibility adjusting system and method for the heat storage coupling cylinder-switching cogeneration unit is as follows:
1. if the thermoelectric ratio required to be supplied by the cogeneration unit is increased, the heat can be released through the heat storage device 15 to supply circulating water to the heat supply network, the inlet valve 16 of the dividing wall type heat exchanger is opened, the outlet valve 17 of the dividing wall type heat exchanger is opened, the circulating water of the heat supply network absorbs the heat released by the heat storage medium in the dividing wall type heat exchanger 18 and then enters the mixed heater 21, and the circulating water is mixed with steam and then supplies heat to the outside so as to meet the heat demand of a user.
2. If the thermoelectric ratio required to be supplied by the cogeneration unit is reduced, the surplus heat can be stored through the heat storage device 15, the outlet valve 11 of the heat storage device is opened, the inlet valve 10 of the heat storage device is opened, the heat storage medium absorbs the surplus heat in the heat exchanger 7 and is stored in the heat storage device 15, and the inlet valve 16 of the dividing wall type heat exchanger and the outlet valve 17 of the dividing wall type heat exchanger are closed simultaneously, so that the heat utilization requirement of a user is met.
Working example 2
A subcritical, once intermediate reheating, single shaft, two-cylinder two-steam-exhaust and condensing steam turbine unit of type N330-16.7/537/537 manufactured by certain eastern steam turbine limited, rated power of 330MW, maximum power of 350.6MW, rated main steam amount of 999.6t/h, maximum main steam amount: 1079.0t/h, rated steam parameter of 16.7MPa/537 ℃ before the main valve, reheated steam parameter of 3.191MPa/537 ℃ before the middle joint and back pressure of 5.2 kPa. After the low-pressure cylinder zero-output transformation is carried out on the unit, the load response rate and the comprehensive energy efficiency are greatly reduced.
The wet cooling unit is implemented with the scheme of the utility model, and the wet cooling unit is additionally provided with a heat storage device, a heat storage heat exchanger and accessory equipment thereof. The heat storage device is internally stored with heat storage media which are divided into a cold area and a hot area. The heat storage medium may be water or oil. The wet cooling unit can cooperatively adjust the thermoelectric output of the unit through the heat storage system and the low-pressure cylinder near-zero output system, increase the electric load adjusting capacity of the unit, improve the heat supply capacity, increase the thermoelectric ratio adjusting upper limit, and improve the flexibility and the adjusting efficiency of the thermoelectric adjustment of the unit. If the thermoelectric ratio that wet cold unit needs to supply increases, can give heat supply network circulating water backwater through heat-retaining device is exothermic, and heat supply network circulating water gets into muddy water heater after being heated and takes out the steam mixing and continue to be heated, then external heat supply to satisfy user's with hot demand. If the thermoelectric ratio that wet cold unit needs to supply reduces, then can store unnecessary heat through heat-retaining device, heat-retaining device no longer supplies heat to the heating network circulating water this moment, and heating network circulating water mixes in muddy water heater with the extraction steam and is heated to satisfy user's with hot demand. When the thermoelectric ratio that wet cold unit needs to supply fluctuates in certain extent, can store or release unnecessary heat through heat-retaining device to satisfy user's requirement for heat, compare in nearly zero power of simple low pressure jar, reduced wet cold unit's regulation number of times, improved the security of cutting jar wet cold unit operation, increased the regulation upper limit of the thermoelectric ratio of wet cold unit, increased the thermoelectric operation area of wet cold unit, increased the electric load regulating power of wet cold unit, promote the heating capacity.
FIG. 3 shows the thermoelectric ratio of the unit after low-pressure cylinder near-zero output and heat storage coupling cylinder cutting. FIG. 4 shows a thermoelectric operation domain of the unit heat storage coupled with low pressure cylinder near zero output. The capacity of the phase-change heat storage tank configured by the 300MW unit is 20MWh, and the phase-change heat storage device has a large capacity and a medium-temperature phase-change heat storage capacity of 20 MW. As can be seen from fig. 3, the phase change heat storage coupled low-pressure cylinder near-zero output system can increase the threshold range of the thermoelectric ratio of the unit, when the low-pressure cylinder is in near-zero output operation, the thermoelectric ratio gradually increases with the increase of the boiler evaporation capacity, and the threshold range of the thermoelectric ratio of the unit is 2.38-2.54; when the phase change heat storage coupling low pressure cylinder operates at near zero output, the thermoelectric ratio is increased and then gradually reduced along with the increase of the evaporation capacity of the boiler, the thermoelectric ratio of the unit is 2.64-2.71, and after the phase change heat storage coupling low pressure cylinder operates at near zero output, the threshold range of the thermoelectric ratio of the unit is increased by 4% -12%. As can be seen from FIG. 4, when the low-pressure cylinder operates at near zero output, the heating power of the unit is 158MW-494MW, and the electric power is 67MW-195 MW; when the phase-change heat storage coupling low-pressure cylinder operates at near zero output, the thermoelectric operation domain of the unit is increased, the heat supply power of the unit is 178MW-514MW, and the electric power is 67MW-195 MW.
Referring to fig. 2, for the wet cooling unit, the circulating cooling water enters the condenser 22 to absorb the heat of the exhaust steam after being cooled in the water cooling tower 23, the condensed exhaust steam becomes condensed water, the condensed water enters the boiler 1 to be converted into main steam and reheat steam after passing through the feed pump inlet valve 21, the feed pump 14 and the feed pump outlet valve 20, and the cooling circulating water absorbing the heat enters the water cooling tower 23 to be cooled through the circulating water pump inlet valve, the circulating water pump 24 and the circulating water pump outlet valve.
The operation mode of the flexibility adjusting system and method of the heat-storage coupling cylinder-switching heat-electricity combined wet and cold supply unit is as follows:
1. if the thermoelectric ratio required to be supplied by the unit is increased, heat can be released by the heat storage device 15 to supply circulating water to the heat supply network, an inlet valve 16 of the dividing wall type heat exchanger is opened, an outlet valve 17 of the dividing wall type heat exchanger is opened, the circulating water of the heat supply network absorbs the heat released by the heat storage medium in the dividing wall type heat exchanger 18 and then enters the mixing heater 19, and the circulating water is mixed with steam and then supplies heat to the outside so as to meet the heat demand of a user.
2. If the thermoelectric ratio required to be supplied by the unit is reduced, redundant heat can be stored through the heat storage device 15, the outlet valve 11 of the heat storage device is opened, the inlet valve 10 of the heat storage device is opened, the heat storage medium absorbs the redundant heat in the heat exchanger 7 and is stored in the heat storage device 15, and the inlet valve 16 of the dividing wall type heat exchanger and the outlet valve 17 of the dividing wall type heat exchanger are closed simultaneously, so that the heat utilization requirement of a user is met.
Claims (8)
1. A heat-storage coupling cylinder-cutting combined heat and power unit is characterized in that based on the combined heat and power unit subjected to cylinder cutting transformation, a steam extraction pipeline of a medium-low pressure communicating pipe is connected with a heat storage system, and the heat storage system is connected with a heat supply network circulating water system; the heat storage system comprises a heat storage heat exchanger (7), a heat storage device (15), a heat storage device inlet valve (10) and a heat storage device outlet valve (11), a steam inlet of the heat storage heat exchanger (7) is connected with a steam extraction pipeline of the medium-low pressure communicating pipe, the heat storage heat exchanger (7) is further connected with the heat storage device (15), the heat storage device (15) is connected with a dividing wall type heat exchanger (18), the dividing wall type heat exchanger (18) is connected with a mixed heat exchanger (19), and the heat storage heat exchanger (7) is connected with the mixed heat exchanger (19).
2. The heat-storage coupled cylinder-cutting combined heat and power unit as claimed in claim 1, wherein a valve, a temperature sensor and a pressure sensor are arranged from an extraction pipeline of the medium-low pressure communicating pipe to a steam pipeline of the heat storage system.
3. The heat-storage coupled cylinder-cutting combined heat and power unit as claimed in claim 1, wherein the steam extraction pipeline of the medium-low pressure communicating pipe is arranged in front of the valve of the medium-pressure cylinder to low-pressure cylinder communicating pipe.
4. The heat-storage coupled cylinder-cutting combined heat and power unit as claimed in claim 1, wherein the unit is a direct air cooling unit or a wet cooling unit.
5. The heat storage coupling cylinder-cutting cogeneration unit according to claim 1, wherein the heat storage device comprises a cold area and a hot area, the hot area stores hot heat storage medium, the cold area stores cold heat storage medium, the heat storage medium in the cold area exchanges heat with steam in the heat storage heat exchanger (7) to absorb heat and then is stored in the hot area of the heat storage device (15), the heat storage medium in the hot area releases heat in the dividing wall type heat exchanger (18) to heat circulating water of a heat network and then returns to the cold area of the heat storage device (15), an inlet and an outlet of the hot area of the heat storage device (15) respectively correspond to a heat medium outlet of the heat storage heat exchanger (7) and a heat medium inlet of the dividing wall type heat exchanger (18), an outlet and an inlet of a cold area of the heat storage device (15) are respectively and correspondingly communicated with an inlet of a medium to be heated of the heat storage heat exchanger (7) and a cold medium outlet of the dividing wall type heat exchanger (18); the heat storage medium in the heat storage device (15) is oil, water or molten salt.
6. The heat-storage coupled cylinder-cutting cogeneration unit according to claim 1, wherein a connection pipeline between the heat-storage heat exchanger (7) and the heat-storage device (15) is provided with a heat-storage-device inlet valve (10) and a heat-storage-device outlet valve (11), and a connection pipeline between the heat-storage device (15) and the dividing wall type heat exchanger (18) is provided with a dividing wall type heat exchanger inlet valve (16) and a dividing wall type heat exchanger outlet valve (17).
7. The heat-storage coupled cylinder-cutting cogeneration unit according to claim 1, wherein a valve, a temperature sensor and a pressure sensor are arranged on the pipelines of the heat-storage heat exchanger (7) and the mixing heat exchanger (19).
8. The heat-storage coupling cylinder-switching cogeneration unit according to claim 1, wherein a cooling steam bypass is arranged between the turbine intermediate pressure cylinder and the turbine low pressure cylinder, a cooling steam bypass regulating valve is arranged on the cooling steam bypass, and an intermediate pressure cylinder steam inlet regulating valve (5) is arranged at an inlet of the turbine intermediate pressure cylinder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121943243.0U CN215723469U (en) | 2021-08-18 | 2021-08-18 | Heat-storage coupled cylinder-cutting combined heat and power unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121943243.0U CN215723469U (en) | 2021-08-18 | 2021-08-18 | Heat-storage coupled cylinder-cutting combined heat and power unit |
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