CN116412566A - Cold energy storage system for centralized cold supply of urban thermal power plant - Google Patents
Cold energy storage system for centralized cold supply of urban thermal power plant Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 324
- 230000005611 electricity Effects 0.000 claims abstract description 138
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 87
- 238000006243 chemical reaction Methods 0.000 claims abstract description 63
- 239000000498 cooling water Substances 0.000 claims abstract description 36
- 238000009825 accumulation Methods 0.000 claims abstract description 28
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- 238000010977 unit operation Methods 0.000 claims description 8
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- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 3
- 238000010248 power generation Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000005057 refrigeration Methods 0.000 abstract description 5
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- 238000004378 air conditioning Methods 0.000 description 1
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- 238000005265 energy consumption Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/04—Arrangement or mounting of control or safety devices for sorption type machines, plants or systems
- F25B49/046—Operating intermittently
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B17/00—Sorption machines, plants or systems, operating intermittently, e.g. absorption or adsorption type
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a concentrated cooling and energy storage system of an urban thermal power plant, which comprises: the electricity consumption peak period determining module: determining the peak electricity utilization period, the flat section electricity utilization period and the valley electricity utilization period of the city; the cooling demand determining module: determining the cooling requirement of each electricity utilization period of the city; the cooling water surplus determination module: determining the unit minimum load of the thermal power plant according to the electricity consumption of the city in the off-peak electricity consumption period and the green energy generating capacity, and determining the cooling water surplus of the cooling tower based on the unit minimum load; and a storage module: the surplus cooling water is converted into low-temperature chilled water according to the conversion system and stored, and the cold accumulation capacity of the conversion system is determined based on the condition that the cold supply requirement of the off-peak electricity consumption period is met; and an adjustment module: when the cold accumulation capacity of the conversion system does not meet the cold supply requirements of the flat section and the peak electricity consumption period, the working time of the conversion system is adjusted, low-cost refrigeration cold accumulation is realized, and the benefit of the urban power plant is maximized.
Description
Technical Field
The invention relates to the field of energy storage, in particular to a concentrated cooling and energy storage system of an urban thermal power plant.
Background
At present, when the urban power plant intensively supplies cold to the periphery, an electric compression heat pump unit is required to cool down chilled water to meet the cold supply requirement, and the electric compression heat pump unit needs a large amount of cooling water under the cold supply working condition to absorb abundant heat energy under the refrigeration working condition. The conventional mode is to set up a mechanical cooling tower for cooling, but the mechanical cooling tower has the disadvantages of large investment, large occupied area, high energy consumption level, high maintenance workload and high cost.
Therefore, the invention provides a concentrated cooling and energy storage system for the urban thermal power plant.
Disclosure of Invention
The invention provides a concentrated cooling energy storage system of an urban thermal power plant, which is used for determining the minimum load of a unit in a valley electricity consumption period and obtaining the cooling water surplus of a cooling tower by determining the cooling demand of the city in each electricity consumption period, determining the cold storage capacity of a conversion system in the valley electricity consumption period, adjusting the working time of the conversion system when the cold storage capacity of the conversion system cannot meet the demand of the flat section and the peak electricity consumption period, fully utilizing the surplus cooling capacity of the unit cooling tower under the low load, realizing low-cost refrigeration cold storage with the low electricity price when the power grid load is smaller, releasing the accumulated chilled water when the power grid load is larger, meeting the concentrated cooling demand of the city and realizing the maximization of the benefit of the urban power plant.
The invention provides a concentrated cooling and energy storage system of an urban thermal power plant, which comprises:
the electricity consumption peak period determining module: the method comprises the steps of determining a peak electricity consumption period, a flat section electricity consumption period and a valley electricity consumption period of a city according to historical electricity consumption conditions of the city power grid;
the cooling demand determining module: the method comprises the steps of determining the cooling requirements of each electricity utilization period of a city;
the cooling water surplus determination module: the method comprises the steps of determining a unit minimum load of a thermal power plant according to the electricity consumption of a city in a valley electricity consumption period and the green energy generating capacity, and determining the cooling water surplus of a cooling tower based on the unit minimum load;
and a storage module: the cold accumulation capacity of the conversion system is determined based on the condition that the cold supply requirement of the off-peak electricity consumption period is met;
and an adjustment module: and the cold accumulation capacity of the conversion system is evaluated to determine whether the cold accumulation capacity of the conversion system meets the cold supply requirements of the flat section and the peak electricity utilization period, and if not, the working time of the conversion system is adjusted.
Preferably, the electricity consumption peak period determining module includes:
daily load curve construction unit: the method comprises the steps of obtaining historical electricity consumption conditions of an urban power grid, and constructing a daily load curve of the urban power grid;
a period determination unit: and the peak electricity utilization period, the flat section electricity utilization period and the valley electricity utilization period of the city are determined according to the daily load curve.
Preferably, the cooling demand determining module includes:
cooling information acquisition unit: the method comprises the steps of acquiring a centralized cooling area of a city, and determining cooling information and cooling time of the centralized cooling area;
a period cooling area determination unit: the system comprises a first concentrated cooling area for a peak power utilization period, a second concentrated cooling area for a flat power utilization period and a third concentrated cooling area for a valley power utilization period, wherein the first concentrated cooling area is used for determining the peak power utilization period, the second concentrated cooling area is used for determining the flat power utilization period and the third concentrated cooling area is used for determining the third concentrated cooling area for the valley power utilization period based on the cooling time;
a cooling demand determination unit: the first cooling requirement is used for determining the peak power utilization period according to the cooling information of all the first concentrated cooling areas;
determining a second cooling requirement of the flat section power utilization period according to cooling information of all second concentrated cooling areas;
and determining the third cooling requirement of the low-valley electricity utilization period according to the cooling information of all the third concentrated cooling areas.
Preferably, the cooling demand determining unit includes:
a first acquisition block: for acquiring a cooling volume of the first concentrated cooling zone and a desired indoor temperature;
a second acquisition block: the outdoor temperature change curve is used for acquiring the peak electricity utilization period of the first concentrated cooling area;
the demand determination block: the first cooling demand is determined according to the cooling volume of the first concentrated cooling area, an outdoor temperature change curve and the indoor required temperature;
the demand correction block: the first cooling demand is corrected according to the regional cooling loss of the first concentrated cooling region;
demand acquisition block: and the first cooling requirement of the peak electricity utilization period is determined according to the corrected cooling requirement amount of all the first concentrated cooling areas.
Preferably, the cooling water surplus determination module includes:
and a power consumption amount determination unit: the electricity consumption amount is used for determining the electricity consumption amount of the off-peak electricity consumption period according to the daily load curve;
a power generation amount determination unit: the method comprises the steps of obtaining the generated energy of green energy in urban off-peak electricity utilization period;
unit operation condition determining unit: the unit working condition meeting the minimum load of the unit is determined;
a cooling water surplus determination unit: and the cooling water surplus of the cooling tower based on the cooling water consumption required by the unit is determined.
Preferably, the storage module includes:
a low-temperature chilled water generation amount determination unit: the system comprises a conversion system, a low-temperature refrigerating water generation device, a power supply device and a power supply device, wherein the conversion system is used for starting in a low-valley electricity utilization period, and the first generation amount of low-temperature refrigerating water is determined according to the conversion capacity of the conversion system;
low temperature chilled water demand determining unit: determining a first low-temperature chilled water demand for the off-peak electricity period according to the cooling demand for the off-peak electricity period;
a first cooling loss determination unit: the method comprises the steps of acquiring first transmission distances between all third concentrated cooling areas and a thermal power plant and cold insulation capacity of a conveying pipe network, and determining first cooling loss of conveying, wherein the first cooling loss is related to water consumption;
cold storage capacity determining unit: the cold accumulation capacity of the conversion system is determined according to the first generation amount of the low-temperature chilled water, the first low-temperature chilled water demand and the first cold supply loss;
and a correction unit: the cold storage device is used for correcting the cold storage capacity according to the cold storage capacity of the cold storage tank.
9. Preferably, the first cooling loss determination unit includes:
wherein, the liquid crystal display device comprises a liquid crystal display device,
representing a first cooling loss; n represents the number of the third concentrated cooling areas; />
Indicating the low-temperature chilled water demand of the ith third concentrated cooling zone; />
Representing the initial temperature of the low-temperature chilled water before being transmitted; />
The cold insulation capacity factor of the conveying pipe network is represented; />
Representing a first transmission distance between the ith third concentrated cooling area and the thermal power plant; t represents the indoor required temperature; />
Representing a standard cooling function; />
Indicating the first transmission distance between the ith third concentrated cooling area and the thermal power plant>
And cold-keeping ability factor->
Is a unit distance loss function of (1); />
Indicating the desired temperature corresponding to the ith third concentrated cooling zone +.>
Cooling temperature before conveying with conveying pipe network>
A standard cooling capacity function per unit distance between.
Preferably, the adjusting module includes:
low temperature chilled water demand determining unit: the system comprises a first low-temperature chilled water demand and a second low-temperature chilled water demand, wherein the first low-temperature chilled water demand is used for determining a flat section power utilization period and a peak power utilization period according to the cold supply demands of the flat section and the peak power utilization period;
a second cooling loss determination unit: the method comprises the steps of acquiring second transmission distances between all first concentrated cooling areas and a thermal power plant and cold insulation capacity of a conveying pipe network, and determining second cooling loss of conveying;
a third cooling loss determination unit: the method comprises the steps of acquiring third transmission distances between all second concentrated cooling areas and a thermal power plant and cold insulation capacity of a conveying pipe network, and determining third cold supply loss of conveying;
total cooling demand determination unit: determining a cooling demand for the peak electricity usage period based on the second chilled water demand and a second cooling loss;
determining a cooling demand for a flat section power usage period based on the third chilled water demand and a third cooling loss;
determining the total cooling demand according to the cooling demand in the peak power consumption period and the cooling demand in the average power consumption period;
a cooling shortage determining unit: judging whether the cold accumulation capacity meets the total cold supply demand, if not, determining the cold supply shortage;
a second generation amount determination unit: the second generation amount of low-temperature chilled water in unit time of the flat section power utilization period conversion system is obtained;
an on time determination unit: and determining the working time of the flat section power utilization period conversion system based on the insufficient cooling quantity and the second production quantity of the low-temperature chilled water.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
fig. 1 is a block diagram of a concentrated cooling and cold energy storage system of an urban thermal power plant according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
Example 1:
the embodiment of the invention provides a concentrated cooling and energy storage system for an urban thermal power plant, which is shown in fig. 1 and comprises:
the electricity consumption peak period determining module: the method comprises the steps of determining a peak electricity consumption period, a flat section electricity consumption period and a valley electricity consumption period of a city according to historical electricity consumption conditions of the city power grid;
the cooling demand determining module: the method comprises the steps of determining the cooling requirements of each electricity utilization period of a city;
the cooling water surplus determination module: the method comprises the steps of determining a unit minimum load of a thermal power plant according to the electricity consumption of a city in a valley electricity consumption period and the green energy generating capacity, and determining the cooling water surplus of a cooling tower based on the unit minimum load;
and a storage module: the cold accumulation capacity of the conversion system is determined based on the condition that the cold supply requirement of the off-peak electricity consumption period is met;
and an adjustment module: and the cold accumulation capacity of the conversion system is evaluated to determine whether the cold accumulation capacity of the conversion system meets the cold supply requirements of the flat section and the peak electricity utilization period, and if not, the working time of the conversion system is adjusted.
In this embodiment, the different electricity utilization periods of the city are determined by constructing a daily load curve of the urban power grid through historical electricity utilization conditions.
In this embodiment, the determination of the cooling demand is determined by determining the concentrated cooling areas of each electricity consumption period, and then determining the cooling information of all the concentrated cooling areas of the corresponding period.
In this embodiment, the electricity consumption of the off-peak electricity consumption period is determined based on a daily load curve, the unit minimum load is determined based on the difference between the electricity consumption and the electricity generation amount, and based on the time of the off-peak electricity consumption period, for example, the difference between the electricity consumption and the electricity generation amount is 100MW, the time of the off-peak electricity consumption period is 8 hours, the unit minimum load is 12.5MW, the cooling water surplus is obtained based on the total amount of cooling water generated by the cooling tower during the off-peak electricity consumption period by determining the working unit and obtaining the cooling water required for the working unit by the unit minimum load.
In this embodiment, the conversion system includes: the low-temperature chilled water can be chilled water at 4 ℃, and the cold accumulation capacity refers to the amount of the low-temperature chilled water which can be stored by the conversion system after meeting the cold supply requirement of the off-peak electricity consumption period.
In this embodiment, the adjustment of the operating time is determined based on the chilled water production and the insufficient cooling capacity of the conversion system during the flat section power usage period.
The beneficial effects of the technical scheme are as follows: the method comprises the steps of determining the cooling demand of a city in each electricity utilization period, determining the unit minimum load of the valley electricity utilization period, obtaining the cooling water surplus of a cooling tower, determining the cold accumulation capacity of a conversion system in the valley electricity utilization period, adjusting the working time of the conversion system when the cold accumulation capacity of the conversion system cannot meet the supply and demand demands of the flat section and the peak electricity utilization period, fully utilizing the surplus cooling capacity of the unit cooling tower under the low load, realizing low-cost refrigeration cold accumulation with the low electricity price of a power grid load, releasing the accumulated chilled water when the power grid load is larger, meeting the centralized cooling demand of the city, and realizing the maximization of the benefit of a city power plant.
Example 2:
based on embodiment 1, the electricity consumption peak period determination module includes:
daily load curve construction unit: the method comprises the steps of obtaining historical electricity consumption conditions of an urban power grid, and constructing a daily load curve of the urban power grid;
a period determination unit: and the peak electricity utilization period, the flat section electricity utilization period and the valley electricity utilization period of the city are determined according to the daily load curve.
In this embodiment, the daily load curve is constructed according to the historical electricity consumption conditions of the same week, for example, the electricity consumption at each same moment is obtained by averaging a plurality of historical electricity consumption conditions of the same monday, so as to construct a daily load curve of the monday, and a total of 7 daily load curves of monday to sunday are constructed.
In this embodiment, the peak electricity consumption period is the exceeding of the daily maximum load in the daily load curve
The flat section electricity consumption period is the daily maximum load in the daily load curve in the period corresponding to the load of the first preset ratio>
First preset ratio and daily maximum load->
The period of time corresponding to the load of the second preset ratio, the period of low electricity consumption is the remaining period of time except peak electricity consumption period and average period of electricity consumption, the first preset ratio and the second preset ratio are set in advance, and the first preset ratio>The second preset ratio may be 70% and 50%, respectively.
The beneficial effects of the technical scheme are as follows: by acquiring the historical electricity consumption condition of the urban power grid, a daily load curve is constructed, and corresponding peak electricity consumption time periods, flat section electricity consumption time periods and valley electricity consumption time periods are acquired according to the daily load curve, so that a foundation is laid for the cooling demand of each subsequent time period.
Example 3:
based on embodiment 1, the cooling demand determination module includes:
cooling information acquisition unit: the method comprises the steps of acquiring a centralized cooling area of a city, and determining cooling information and cooling time of the centralized cooling area;
a period cooling area determination unit: the system comprises a first concentrated cooling area for a peak power utilization period, a second concentrated cooling area for a flat power utilization period and a third concentrated cooling area for a valley power utilization period, wherein the first concentrated cooling area is used for determining the peak power utilization period, the second concentrated cooling area is used for determining the flat power utilization period and the third concentrated cooling area is used for determining the third concentrated cooling area for the valley power utilization period based on the cooling time;
a cooling demand determination unit: the first cooling requirement is used for determining the peak power utilization period according to the cooling information of all the first concentrated cooling areas;
determining a second cooling requirement of the flat section power utilization period according to cooling information of all second concentrated cooling areas;
and determining the third cooling requirement of the low-valley electricity utilization period according to the cooling information of all the third concentrated cooling areas.
In this embodiment, the cooling information includes a cooling volume of the centralized cooling area, a temperature required in the room, etc., and the cooling time is determined by an open time of the centralized cooling area, for example, the business area determines the cooling time according to the open and close times of the mall.
In this embodiment, the first cooling requirement is obtained by determining the first cooling requirement by acquiring the cooling volume of the first concentrated cooling area, the indoor required temperature, and the outdoor temperature change, and correcting the first cooling requirement according to the area cooling loss, and the second cooling requirement, the third cooling requirement, and the first cooling requirement are similar.
The beneficial effects of the technical scheme are as follows: the concentrated cooling areas in different time periods are obtained by determining the cooling information and the cooling time of the concentrated cooling areas, and then the cooling demands in different time periods are determined, so that a foundation is laid for subsequently determining the cold storage capacity of the conversion system and evaluating whether the cold storage capacity meets the cooling demands in flat-section and peak power utilization time periods.
Example 4:
based on embodiment 3, the cooling demand determining unit includes:
a first acquisition block: for acquiring a cooling volume of the first concentrated cooling zone and a desired indoor temperature;
a second acquisition block: the outdoor temperature change curve is used for acquiring the peak electricity utilization period of the first concentrated cooling area;
the demand determination block: the first cooling demand is determined according to the cooling volume of the first concentrated cooling area, an outdoor temperature change curve and the indoor required temperature;
the demand correction block: the first cooling demand is corrected according to the regional cooling loss of the first concentrated cooling region;
demand acquisition block: and the first cooling requirement of the peak electricity utilization period is determined according to the corrected cooling requirement amount of all the first concentrated cooling areas.
In this embodiment, the cooling volume is determined based on the indoor volume of the building in the cooling zone, and the indoor desired temperature is set artificially, which may be 24 ℃.
In this embodiment, the outdoor temperature change curve may be obtained by weather forecast.
In this embodiment, the first cooling demand is an amount of heat that needs to be absorbed to maintain the indoor desired temperature in the first concentrated cooling area obtained by a cooling model that is trained in advance based on a cooling volume, an outdoor temperature variation curve, and the indoor desired temperature.
In this embodiment, the zone cooling loss is obtained from the historical air conditioning cooling loss, and the correction is to add the first cooling demand to the zone cooling loss.
In this embodiment, the first cooling demand is added according to the corrected cooling demand amounts of all the first concentrated cooling areas.
In this embodiment, the second and third cooling demands are determined in a similar manner to the first cooling demand.
The beneficial effects of the technical scheme are as follows: the cooling volume, the outdoor temperature change curve and the indoor required temperature of the first concentrated cooling area are obtained, the cooling demand is determined, the cooling demand is corrected according to the regional cooling loss, the first cooling demand is obtained according to the cooling demand of all the first concentrated cooling areas, and a foundation is laid for the subsequent determination of the cold storage capacity of the conversion system.
Example 5:
based on embodiment 2, the cooling water surplus determination module includes:
and a power consumption amount determination unit: the electricity consumption amount is used for determining the electricity consumption amount of the off-peak electricity consumption period according to the daily load curve;
a power generation amount determination unit: the method comprises the steps of obtaining the generated energy of green energy in urban off-peak electricity utilization period;
unit operation condition determining unit: the unit working condition meeting the minimum load of the unit is determined;
a cooling water surplus determination unit: and the cooling water surplus of the cooling tower based on the cooling water consumption required by the unit is determined.
In this embodiment, the electricity consumption amount in the off-peak electricity consumption period is obtained by adding the electricity consumption amounts at all times corresponding to the off-peak electricity consumption period according to the daily load curve.
In this embodiment, the minimum load of the unit is determined by the difference between the electricity consumption and the electricity generation, and based on the time of the off-peak electricity consumption period, the unit operation condition is determined based on the minimum load of the unit, and the unit operation condition is preferably determined on the condition that the minimum number of unit operations is the minimum, for example, the minimum load of the unit is 100MW, 6 units of 20MW, 2 units of 50MW exist in the power plant, and 2 unit operations of 50MW are preferably selected.
In this embodiment, the cooling water generation amount is the cooling water generation amount of the cooling tower based on the off-peak electricity consumption period, the cooling water usage amount required for the unit is obtained from the cooling water usage amount required for the unit operation history, and the cooling water rich amount is the difference between the cooling water generation amount of the cooling tower and the cooling water usage amount of the unit.
The beneficial effects of the technical scheme are as follows: the minimum load of the unit is determined by acquiring the electricity consumption of the valley electricity consumption period and the electricity generation amount of the green energy, so that the working condition of the unit is determined, the cooling water surplus of the cooling tower based on the cooling water consumption required by the unit is acquired, and a foundation is laid for the follow-up determination of the cold accumulation capacity of the conversion system.
Example 6:
based on embodiment 1, the storage module includes:
a low-temperature chilled water generation amount determination unit: the system comprises a conversion system, a low-temperature refrigerating water generation device, a power supply device and a power supply device, wherein the conversion system is used for starting in a low-valley electricity utilization period, and the first generation amount of low-temperature refrigerating water is determined according to the conversion capacity of the conversion system;
low-temperature chilled water demand determining unit: determining a first low-temperature chilled water demand for the off-peak electricity period according to the cooling demand for the off-peak electricity period;
a first cooling loss determination unit: the method comprises the steps of acquiring first transmission distances between all third concentrated cooling areas and a thermal power plant and cold insulation capacity of a conveying pipe network, and determining first cooling loss of conveying, wherein the first cooling loss is related to water consumption;
cold storage capacity determining unit: the cold accumulation capacity of the conversion system is determined according to the first generation amount of the low-temperature chilled water, the first low-temperature chilled water demand and the first cold supply loss;
and a correction unit: the cold storage device is used for correcting the cold storage capacity according to the cold storage capacity of the cold storage tank.
In this embodiment, the conversion capacity refers to the amount of chilled water converted into low-temperature chilled water per unit time of the conversion system, and the first generation amount is multiplied according to the operation time of the conversion system and the conversion capacity.
In this embodiment, the first low-temperature chilled water demand is the amount of low-temperature chilled water required to reach the cooling demand by the amount of heat absorbed by the low-temperature chilled water initially raised to the indoor required temperature, for example 10000J for the low-valley period, 25℃for the indoor required temperature, 4℃for the low-temperature chilled water initially, and the specific heat capacity of the low-temperature chilled water is
Then the first low temperature chilled water demand is equal to +.>
。
In this embodiment, the first cooling loss refers to an amount of water that is consumed more based on an increase in temperature of the low-temperature chilled water during the transfer.
In this embodiment, the cold storage capacity is calculated based on the first generation amount, the first low temperature chilled water demand, and the first cooling loss, for example, the first generation amount is 100 tons, the first low temperature chilled water demand is 20 tons, and the first cooling loss is 5 tons, and then the cold storage capacity of the conversion system is 75 tons of low temperature chilled water stored in the cold storage tank, and the absorbable heat of the 75 tons of low temperature chilled water to the indoor required temperature is the cold storage capacity of the conversion system.
In this embodiment, the cold insulation capacity refers to the heat insulation capacity of the cold storage tank, measured by increasing the temperature of the low-temperature freezing level in the cold storage tank in unit time, and the correction of the cold storage capacity is obtained by a correction model, which is trained in advance according to the cold insulation capacity, the cold insulation time, and the like of the cold storage tank.
The beneficial effects of the technical scheme are as follows: the cold accumulation capacity of the conversion system is determined by determining the generation amount of low-temperature chilled water of the conversion system, acquiring the demand amount of chilled water and the cold supply loss, and correcting the cold accumulation capacity according to the cold accumulation capacity of the cold accumulation tank, so that the cold accumulation capacity of the conversion system can be more accurately determined, and a foundation is laid for the follow-up adjustment of the opening time of the conversion system.
Example 7:
10. based on embodiment 6, the first cooling loss determination unit includes:
wherein, the liquid crystal display device comprises a liquid crystal display device,
representing a first cooling loss; n represents the number of the third concentrated cooling areas; />
Indicating the low-temperature chilled water demand of the ith third concentrated cooling zone; />
Representing the initial temperature of the low-temperature chilled water before being transmitted; />
The cold insulation capacity factor of the conveying pipe network is represented; />
Representing a first transmission distance between the ith third concentrated cooling area and the thermal power plant; t represents the indoor required temperature; />
Representing a standard cooling function; />
Indicating the first transmission distance between the ith third concentrated cooling area and the thermal power plant>
And cold-keeping ability factor->
Is a unit distance loss function of (1); />
Indicating the desired temperature corresponding to the ith third concentrated cooling zone +.>
Cooling temperature before conveying with conveying pipe network>
A standard cooling capacity function per unit distance between.
In this embodiment of the present invention, the process is performed,
the transmission loss of the unit distance corresponding to different conveying pipe networks can be different, and the transmission loss is determined according to common knowledge and belongs to known parameters.
The beneficial effects of the technical scheme are as follows: the first cooling loss is determined through the chilled water demand of all third concentrated cooling areas, the distance in the low-temperature chilled water transmission process, the cold insulation capacity factor of the conveying pipe network and the standard cooling function, and a foundation is laid for the subsequent determination of the cold storage capacity of the conversion system.
Example 8:
based on embodiment 1, the adjustment module includes:
low temperature chilled water demand determining unit: the system comprises a first low-temperature chilled water demand and a second low-temperature chilled water demand, wherein the first low-temperature chilled water demand is used for determining a flat section power utilization period and a peak power utilization period according to the cold supply demands of the flat section and the peak power utilization period;
a second cooling loss determination unit: the method comprises the steps of acquiring second transmission distances between all first concentrated cooling areas and a thermal power plant and cold insulation capacity of a conveying pipe network, and determining second cooling loss of conveying;
a third cooling loss determination unit: the method comprises the steps of acquiring third transmission distances between all second concentrated cooling areas and a thermal power plant and cold insulation capacity of a conveying pipe network, and determining third cold supply loss of conveying;
total cooling demand determination unit: determining a cooling demand for the peak electricity usage period based on the second chilled water demand and a second cooling loss;
determining a cooling demand for a flat section power usage period based on the third chilled water demand and a third cooling loss;
determining the total cooling demand according to the cooling demand in the peak power consumption period and the cooling demand in the average power consumption period;
a cooling shortage determining unit: judging whether the cold accumulation capacity meets the total cold supply demand, if not, determining the cold supply shortage;
a second generation amount determination unit: the second generation amount of low-temperature chilled water in unit time of the flat section power utilization period conversion system is obtained;
an on time determination unit: and determining the working time of the flat section power utilization period conversion system based on the insufficient cooling quantity and the second production quantity of the low-temperature chilled water.
In this embodiment, the second low-temperature chilled water demand and the third low-temperature chilled water demand are determined in a manner similar to that of the first low-temperature chilled water demand.
In this embodiment, the second cooling loss and the third cooling loss are determined in a manner similar to that of the first cooling loss.
In this embodiment, the cooling demand in the peak electricity consumption period is obtained by adding the second chilled water demand and the second cooling loss, the cooling demand in the flat electricity consumption period is obtained by adding the third chilled water demand and the third loss, and the total cooling demand is obtained by adding the cooling demand in the peak and flat electricity consumption periods.
In this embodiment, the insufficient amount of cooling is determined based on the difference between the cold storage capacity and the total amount of cooling demand.
In this embodiment, the second generation amount refers to the amount of low-temperature chilled water that the conversion system can generate per hour when turned on during the flat-section power-on period.
In this embodiment, the determination of the operating time is obtained by dividing the cooling deficiency by the second generation amount, for example, the cooling deficiency is a, the second generation amount is b, the duration of the operating time is a/b, the specific operating time in the flat power consumption period is determined based on the operating time, for example, the operating time is 1 hour, the flat power consumption period is 7 to 9 points, and the operating time is 7 to 8 points.
The beneficial effects of the technical scheme are as follows: the total cooling demand of the peak power utilization period and the average power utilization period is determined, compared with the cold storage capacity, when the energy storage capacity does not meet the total cooling demand, the low-temperature chilled water production of the cooling deficiency and the average power utilization period is determined, the working time of the conversion system in the average power utilization period is obtained, the conversion system works at low electricity price, low-cost refrigeration is realized, the concentrated cooling demand is met at high electricity price, and the benefit maximization of the urban power plant is realized.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A cold energy storage system for concentrated cooling of an urban thermal power plant, comprising:
the electricity consumption peak period determining module: the method comprises the steps of determining a peak electricity consumption period, a flat section electricity consumption period and a valley electricity consumption period of a city according to historical electricity consumption conditions of the city power grid;
the cooling demand determining module: the method comprises the steps of determining the cooling requirements of each electricity utilization period of a city;
the cooling water surplus determination module: the method comprises the steps of determining a unit minimum load of a thermal power plant according to the electricity consumption of a city in a valley electricity consumption period and the green energy generating capacity, and determining the cooling water surplus of a cooling tower based on the unit minimum load;
and a storage module: the cold accumulation capacity of the conversion system is determined based on the condition that the cold supply requirement of the off-peak electricity consumption period is met;
and an adjustment module: and the cold accumulation capacity of the conversion system is evaluated to determine whether the cold accumulation capacity of the conversion system meets the cold supply requirements of the flat section and the peak electricity utilization period, and if not, the working time of the conversion system is adjusted.
2. The cold energy storage system for concentrated cooling in a municipal thermal power plant according to claim 1, wherein said peak electricity consumption period determining module comprises:
daily load curve construction unit: the method comprises the steps of obtaining historical electricity consumption conditions of an urban power grid, and constructing a daily load curve of the urban power grid;
a period determination unit: and the peak electricity utilization period, the flat section electricity utilization period and the valley electricity utilization period of the city are determined according to the daily load curve.
3. The concentrated cooling and energy storage system for a municipal thermal power plant according to claim 1, wherein said cooling demand determining module comprises:
cooling information acquisition unit: the method comprises the steps of acquiring a centralized cooling area of a city, and determining cooling information and cooling time of the centralized cooling area;
a period cooling area determination unit: the system comprises a first concentrated cooling area for a peak power utilization period, a second concentrated cooling area for a flat power utilization period and a third concentrated cooling area for a valley power utilization period, wherein the first concentrated cooling area is used for determining the peak power utilization period, the second concentrated cooling area is used for determining the flat power utilization period and the third concentrated cooling area is used for determining the third concentrated cooling area for the valley power utilization period based on the cooling time;
a cooling demand determination unit: the first cooling requirement is used for determining the peak power utilization period according to the cooling information of all the first concentrated cooling areas;
determining a second cooling requirement of the flat section power utilization period according to cooling information of all second concentrated cooling areas;
and determining the third cooling requirement of the low-valley electricity utilization period according to the cooling information of all the third concentrated cooling areas.
4. A concentrated cooling and energy storage system for a municipal thermal power plant according to claim 3, wherein said cooling demand determining unit comprises:
a first acquisition block: for acquiring a cooling volume of the first concentrated cooling zone and a desired indoor temperature;
a second acquisition block: the outdoor temperature change curve is used for acquiring the peak electricity utilization period of the first concentrated cooling area;
the demand determination block: the first cooling demand is determined according to the cooling volume of the first concentrated cooling area, an outdoor temperature change curve and the indoor required temperature;
the demand correction block: the first cooling demand is corrected according to the regional cooling loss of the first concentrated cooling region;
demand acquisition block: and the first cooling requirement of the peak electricity utilization period is determined according to the corrected cooling requirement amount of all the first concentrated cooling areas.
5. The cold energy storage system for concentrated cooling in a municipal thermal power plant according to claim 2, wherein said cooling water surplus determination module comprises:
and a power consumption amount determination unit: the electricity consumption amount is used for determining the electricity consumption amount of the off-peak electricity consumption period according to the daily load curve;
a power generation amount determination unit: the method comprises the steps of obtaining the generated energy of green energy in urban off-peak electricity utilization period;
unit operation condition determining unit: the unit working condition meeting the minimum load of the unit is determined;
a cooling water surplus determination unit: and the cooling water surplus of the cooling tower based on the cooling water consumption required by the unit is determined.
6. The concentrated cooling and energy storage system for a municipal thermal power plant according to claim 1, wherein said storage module comprises:
a low-temperature chilled water generation amount determination unit: the system comprises a conversion system, a low-temperature refrigerating water generation device, a power supply device and a power supply device, wherein the conversion system is used for starting in a low-valley electricity utilization period, and the first generation amount of low-temperature refrigerating water is determined according to the conversion capacity of the conversion system;
low temperature chilled water demand determining unit: determining a first low-temperature chilled water demand for the off-peak electricity period according to the cooling demand for the off-peak electricity period;
a first cooling loss determination unit: the method comprises the steps of acquiring first transmission distances between all third concentrated cooling areas and a thermal power plant and cold insulation capacity of a conveying pipe network, and determining first cooling loss of conveying, wherein the first cooling loss is related to water consumption;
cold storage capacity determining unit: the cold accumulation capacity of the conversion system is determined according to the first generation amount of the low-temperature chilled water, the first low-temperature chilled water demand and the first cold supply loss;
and a correction unit: the cold storage device is used for correcting the cold storage capacity according to the cold storage capacity of the cold storage tank.
7. The concentrated cooling and energy storage system for a municipal thermal power plant according to claim 6, wherein said first cooling loss determining unit comprises:
wherein, the liquid crystal display device comprises a liquid crystal display device,
representing a first cooling loss; n represents the number of the third concentrated cooling areas; />
Indicating the low-temperature chilled water demand of the ith third concentrated cooling zone; />
Representing the initial temperature of the low-temperature chilled water before being transmitted; />
The cold insulation capacity factor of the conveying pipe network is represented; />
Representing a first transmission distance between the ith third concentrated cooling area and the thermal power plant; t represents the indoor required temperature; />
Representing a standard cooling function; />
Indicating the first transmission distance between the ith third concentrated cooling area and the thermal power plant>
And cold-keeping ability factor->
Is a unit distance loss function of (1); />
Indicating the desired temperature corresponding to the ith third concentrated cooling zone +.>
Cooling temperature before conveying with conveying pipe network>
A standard cooling capacity function per unit distance between.
8. The cold energy storage system for concentrated cooling in a municipal thermal power plant according to claim 1, wherein said adjusting module comprises:
low temperature chilled water demand determining unit: the system comprises a first low-temperature chilled water demand and a second low-temperature chilled water demand, wherein the first low-temperature chilled water demand is used for determining a flat section power utilization period and a peak power utilization period according to the cold supply demands of the flat section and the peak power utilization period;
a second cooling loss determination unit: the method comprises the steps of acquiring second transmission distances between all first concentrated cooling areas and a thermal power plant and cold insulation capacity of a conveying pipe network, and determining second cooling loss of conveying;
a third cooling loss determination unit: the method comprises the steps of acquiring third transmission distances between all second concentrated cooling areas and a thermal power plant and cold insulation capacity of a conveying pipe network, and determining third cold supply loss of conveying;
total cooling demand determination unit: determining a cooling demand for the peak electricity usage period based on the second chilled water demand and a second cooling loss;
determining a cooling demand for a flat section power usage period based on the third chilled water demand and a third cooling loss;
determining the total cooling demand according to the cooling demand in the peak power consumption period and the cooling demand in the average power consumption period;
a cooling shortage determining unit: judging whether the cold accumulation capacity meets the total cold supply demand, if not, determining the cold supply shortage;
a second generation amount determination unit: the second generation amount of low-temperature chilled water in unit time of the flat section power utilization period conversion system is obtained;
an on time determination unit: and determining the working time of the flat section power utilization period conversion system based on the insufficient cooling quantity and the second production quantity of the low-temperature chilled water.
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101334203A (en) * | 2008-08-04 | 2008-12-31 | 龙涛 | Method for enhancing cold-storage density of cold storage air conditioner system and cold storage air conditioner system |
| CN201297727Y (en) * | 2008-09-26 | 2009-08-26 | 向旺 | Cold-storage heat-storage energy-saving synchronization system |
| CN101629748A (en) * | 2009-07-03 | 2010-01-20 | 深圳力合节能技术有限公司 | Central air-conditioning system of ice slurry cold storage |
| US20120047891A1 (en) * | 2010-07-24 | 2012-03-01 | Matthew Rosenfeld | Techniques for indirect cold temperature thermal energy storage |
| CN103574845A (en) * | 2013-11-04 | 2014-02-12 | 国家电网公司 | Cooling load prediction based optimal control method of ice-storage system |
| CN106403102A (en) * | 2016-09-05 | 2017-02-15 | 珠海格力电器股份有限公司 | Energy intelligent control method, device and system |
| CN107816910A (en) * | 2017-10-18 | 2018-03-20 | 烟台卓越新能源科技股份有限公司 | Power plant's depth synthesis peak regulation system and peak regulating method |
| WO2018233024A1 (en) * | 2017-06-22 | 2018-12-27 | 赫普热力发展有限公司 | Thermoelectric decoupling peak load regulating system |
| WO2019196375A1 (en) * | 2018-04-13 | 2019-10-17 | 华南理工大学 | Demand side response-based microgrid optimal unit and time-of-use electricity price optimization method |
| CN110567041A (en) * | 2018-06-05 | 2019-12-13 | 江苏蓄能谷实业有限公司 | Distributed energy storage peak regulation heating system for thermoelectric urban heat supply |
| CN110657512A (en) * | 2018-06-29 | 2020-01-07 | 清华大学 | Ice storage air conditioner economic analysis method and device based on thermoelectric combined scheduling |
| CN113803709A (en) * | 2020-06-17 | 2021-12-17 | 赫普能源环境科技股份有限公司 | Thermal power plant coupling data center comprehensive energy system and operation method |
| WO2022105061A1 (en) * | 2020-11-17 | 2022-05-27 | 南京工业大学 | Mobile energy storage internet system |
-
2023
- 2023-02-07 CN CN202310097025.7A patent/CN116412566B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101334203A (en) * | 2008-08-04 | 2008-12-31 | 龙涛 | Method for enhancing cold-storage density of cold storage air conditioner system and cold storage air conditioner system |
| CN201297727Y (en) * | 2008-09-26 | 2009-08-26 | 向旺 | Cold-storage heat-storage energy-saving synchronization system |
| CN101629748A (en) * | 2009-07-03 | 2010-01-20 | 深圳力合节能技术有限公司 | Central air-conditioning system of ice slurry cold storage |
| US20120047891A1 (en) * | 2010-07-24 | 2012-03-01 | Matthew Rosenfeld | Techniques for indirect cold temperature thermal energy storage |
| CN103574845A (en) * | 2013-11-04 | 2014-02-12 | 国家电网公司 | Cooling load prediction based optimal control method of ice-storage system |
| CN106403102A (en) * | 2016-09-05 | 2017-02-15 | 珠海格力电器股份有限公司 | Energy intelligent control method, device and system |
| WO2018233024A1 (en) * | 2017-06-22 | 2018-12-27 | 赫普热力发展有限公司 | Thermoelectric decoupling peak load regulating system |
| CN107816910A (en) * | 2017-10-18 | 2018-03-20 | 烟台卓越新能源科技股份有限公司 | Power plant's depth synthesis peak regulation system and peak regulating method |
| WO2019196375A1 (en) * | 2018-04-13 | 2019-10-17 | 华南理工大学 | Demand side response-based microgrid optimal unit and time-of-use electricity price optimization method |
| CN110567041A (en) * | 2018-06-05 | 2019-12-13 | 江苏蓄能谷实业有限公司 | Distributed energy storage peak regulation heating system for thermoelectric urban heat supply |
| CN110657512A (en) * | 2018-06-29 | 2020-01-07 | 清华大学 | Ice storage air conditioner economic analysis method and device based on thermoelectric combined scheduling |
| CN113803709A (en) * | 2020-06-17 | 2021-12-17 | 赫普能源环境科技股份有限公司 | Thermal power plant coupling data center comprehensive energy system and operation method |
| WO2022105061A1 (en) * | 2020-11-17 | 2022-05-27 | 南京工业大学 | Mobile energy storage internet system |
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