CN111219250A - A hybrid distributed energy supply system - Google Patents
A hybrid distributed energy supply system Download PDFInfo
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 16
- 239000003345 natural gas Substances 0.000 claims description 8
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
- F02C6/18—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1818—Arrangement or mounting of electric heating means
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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
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
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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
- F25B21/00—Machines, plants or systems, using electric or magnetic effects
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/04—Circuit arrangements for AC mains or AC distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
- Y02B30/625—Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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Abstract
本发明公开了一种混合分布式供能系统，包括，电能分配单元，包括外部电网、自供电网和自用电网，所述外部电网、自供电网和自用电网之间电连接；产能单元，包括冷热电联产部件和分产供应，所述冷热电联产部件与所述电能分配单元电连接，所述分产部件输送所述冷热电联产部件产生的能量；所述冷热电联产部件包括热动力件和电动力件，所述热动力件与所述自供电网电连接并向其供电，所述电动力件与所述自用电网连接并从其处获取电能。本发明结构合理，联产和分产并列在一个系统内，在发电并网上网的条件下，采用联产与分产供能配比的最优比例进行功能，以降低能耗，提高经济性。
The invention discloses a hybrid distributed energy supply system, comprising: an electric energy distribution unit, including an external power grid, a self-power supply network and a self-use power grid, and the external power grid, the self-power supply network and the self-use power grid are electrically connected; The cooling, heating and power cogeneration component and the sub-production supply, the cooling, heating and power co-generation component is electrically connected to the electric energy distribution unit, and the sub-production component transmits the energy generated by the cooling, heating and power co-generation component; the cooling and heating components The co-generation component includes a thermal power member that is electrically connected to and supplies power to the self-supply grid, and an electric power member that is connected to and obtains electrical energy from the self-consumption grid. The invention has a reasonable structure, co-production and sub-production are arranged in one system, and under the condition that power generation is connected to the grid, the optimal ratio of co-production and sub-production energy supply ratio is used to perform functions to reduce energy consumption and improve economy.
Description
Technical Field
The invention relates to the technical field of energy supply systems, in particular to a hybrid distributed energy supply system.
Background
In recent years, the energy crisis has become one of the global great challenges. The distributed energy supply system is the key point of the energy strategy in China, and the energy supply mode of the distributed energy supply system becomes a development trend due to the characteristics of small scale, strong flexibility and the like. The combined cooling heating and power system with gas turbine and internal combustion engine as prime mover can meet the user's requirement and utilize energy comprehensively and in cascade mode, and has raised energy utilization and environment friendship. However, under certain conditions, a simple combined cooling heating and power system is not necessarily superior to a separate production system in terms of economy, and a simple separate production system is not necessarily superior to a combined cooling heating and power system. Therefore, certain research value exists in the energy distribution of co-production and separate production.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments, and in this section as well as in the abstract and the title of the invention of this application some simplifications or omissions may be made to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made keeping in mind the above problems occurring in the prior art and/or the problems occurring in the prior art.
Therefore, the technical problem to be solved by the invention is that the traditional pure cooling, heating and power cogeneration system or the pure cooling and heating separate production system is poor in energy consumption in function.
In order to solve the technical problems, the invention provides the following technical scheme: a hybrid distributed energy supply system comprises an electric energy distribution unit, a power supply unit and a power supply unit, wherein the electric energy distribution unit comprises an external power grid, a self-supply power grid and a self-use power grid, and the external power grid, the self-supply power grid and the self-use power grid are electrically connected; and the energy production unit comprises a combined cooling heating and power component and a separate production supply, the combined cooling and power component is electrically connected with the electric energy distribution unit, and the separate production component is used for conveying the energy generated by the combined cooling, heating and power component.
As a preferable aspect of the hybrid distributed power supply system of the present invention, wherein: the combined cooling, heating and power component comprises a thermal power component and an electric power component, wherein the thermal power component is electrically connected with the self-powered power grid and supplies power to the self-powered power grid, and the electric power component is connected with the self-powered power grid and obtains electric energy from the self-powered power grid.
As a preferable aspect of the hybrid distributed power supply system of the present invention, wherein: the thermal power element comprises a gas turbine, a heat exchanger and an absorption refrigerator, the heat exchanger and the absorption refrigerator are connected with the gas turbine, and the gas turbine is electrically connected with the self-power supply network.
As a preferable aspect of the hybrid distributed power supply system of the present invention, wherein: the electric power piece comprises an electric boiler and an electric refrigerator, and the electric boiler and the electric refrigerator are both connected with the self-service power grid.
As a preferable aspect of the hybrid distributed power supply system of the present invention, wherein: the separate production supply comprises a heat supply chain, a cold supply chain and a cooling and heating user, and the heat supply chain, the cold supply chain and a self-service power grid are connected with the cooling and heating user to supply energy to the cooling and heating user.
As a preferable aspect of the hybrid distributed power supply system of the present invention, wherein: the heat supply chain comprises an electric heating line and a thermal heating line, the electric heating line is connected with the electric boiler, and the thermal heating line is connected with the heat exchanger.
As a preferable aspect of the hybrid distributed power supply system of the present invention, wherein: the cold supply chain comprises an electric refrigeration line and a thermal refrigeration line, the electric refrigeration line is connected with the electric refrigerator, and the thermal refrigeration line is connected with the absorption refrigerator.
As a preferable aspect of the hybrid distributed power supply system of the present invention, wherein: the gas turbine fuel is natural gas.
As a preferable aspect of the hybrid distributed power supply system of the present invention, wherein: the ratio of the heat supply amount of the electric power heat supply line in the total heat supply amount of the heat supply chain is 0.5.
As a preferable aspect of the hybrid distributed power supply system of the present invention, wherein: the proportion of the cooling capacity of the electric power refrigerating line in the total cooling capacity of the cold supply chain is 0.8.
The invention has the beneficial effects that: the invention has reasonable structure, co-production and sub-production are arranged in one system, and the functions are carried out by adopting the optimal proportion of energy supply proportion of the co-production and the sub-production under the condition of power generation grid connection and network access, so as to reduce energy consumption and improve economy.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
fig. 1 is a schematic overall structure diagram of a hybrid distributed energy supply system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a cogeneration unit in a hybrid distributed energy supply system according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a distribution supply in a hybrid distributed energy supply system according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a thermal power member in a hybrid distributed energy supply system according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a point power member in a hybrid distributed energy supply system according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of energy distribution in a hybrid distributed energy supply system according to an embodiment of the present invention;
FIG. 7 is a typical work daily load for users in different seasons (a) a summer typical daily load curve (b) a winter typical daily load curve (c) a transition season typical daily load curve;
FIG. 8 is a plot of X1, X2 versus total annual cost Ccap.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Next, the present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially according to the general scale for convenience of illustration when describing the embodiments of the present invention, and the drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
Referring to fig. 1 to 5, the embodiment provides a hybrid distributed energy supply system, including an electric energy distribution unit 100, which includes an external power grid 101, a self-powered grid 102, and a self-powered grid 103, where the external power grid 101, the self-powered grid 102, and the self-powered grid 103 are electrically connected to each other; the power generation unit 200 includes a combined cooling heating and power unit 201 and a separate power supply 202, the combined cooling and power unit 201 is electrically connected to the power distribution unit 100, and the separate power unit 202 delivers energy generated by the combined cooling and power unit 201.
The combined cooling, heating and power generation component 201 comprises a thermal power element 201a and an electric power element 201b, wherein the thermal power element 201a is electrically connected with the self-power supply grid 102 and supplies power to the self-power supply grid 102, and the electric power element 201b is connected with the self-power supply grid 103 and obtains electric energy from the self-power supply grid.
The thermal power element 201a comprises a gas turbine 201a-1, a heat exchanger 201a-2 and an absorption chiller 201a-3, the heat exchanger 201a-2 and the absorption chiller 201a-3 are connected with the gas turbine 201a-1, and the gas turbine 201a-1 is electrically connected with the self-power supply network 102.
The gas turbine 201a-1 is fueled by natural gas.
The electric power element 201b comprises an electric boiler 201b-1 and an electric refrigerator 201b-2, and the electric boiler 201b-1 and the electric refrigerator 201b-2 are both connected with the self-service power grid 103.
In the embodiment, the system aims to combine a combined cooling, heating and power system with a cooling and heating distribution system, and distribute the distribution proportion of cooling or heating sources to users according to the optimal proportion, so as to reduce energy consumption, improve the utilization rate and increase the economy; when the user needs not only electricity but also other forms of energy, such as supply of cold energy and heat energy, it is difficult to realize comprehensive cascade utilization of energy when the above needs are satisfied only by electricity, the combined cooling heating and power generation unit 201 performs this task, a part of which uses heat energy to generate electricity to supply electricity to the self-power grid 102, and the waste heat is directly supplied to the user in other forms of energy, and is converted from consumption of electricity by the self-power grid 103 to other forms of energy to supply the user.
The electric energy distribution unit 100 is used for adjusting electric energy in the system, so that the system can automatically adjust to meet requirements when facing different power loads in different seasons, specifically, the electric energy generated by the combined cooling heating and power generation component 201 by itself is transmitted to the self-supply network 102, the power consumption of equipment and users is supplied through the self-supply network 103, the self-supply network 102 is connected with the external power grid 101 for intermediate regulation, the combined cooling and power generation component 201 generates power and supplies the power to the self-supply network 102 in the power consumption peak period, part of the electric energy is transmitted to the self-supply network 103 from the self-supply network 102 for the consumption of the users and the equipment, and redundant electric energy is supplied to the external power grid 101; during peak power consumption, when the electric energy transmitted from the power supply grid 102 to the power consumption grid 103 cannot meet the demand of users and equipment, the power consumption grid 102 obtains the electric energy from the external power grid 101 to supplement the electric energy to the power consumption grid 103.
The split-production supply 202 apportions the different forms of energy to the user for optimal economy and minimum energy consumption.
The thermal power element 201a mainly uses the combustion of the gas turbine 201a-1 to drive the generator to generate electricity, and the waste heat is supplied to users in other energy forms as an auxiliary to operate, so that the energy utilization is efficient. Specifically, the gas turbine 201a-1 is fueled by natural gas, and the other forms of energy include thermal energy generated by driving the heat exchanger 201a-2 and refrigeration generated by driving the absorption chiller 201a-3, and supplying both forms of energy to the user for direct use.
The electric power element 201b comprises an electric boiler 201b-1 and an electric refrigerator 201b-2, the electric boiler 201b-1 obtains electric energy from the self-power grid 103 to generate heat for supplying to users, and the electric refrigerator 201b-2 obtains electric energy from the self-power grid 103 to refrigerate for the users.
Example 2
Referring to fig. 6 to 8, the embodiment provides a hybrid distributed energy supply system, including an electric energy distribution unit 100, which includes an external power grid 101, a self-powered grid 102, and a self-powered grid 103, where the external power grid 101, the self-powered grid 102, and the self-powered grid 103 are electrically connected to each other; the power generation unit 200 includes a combined cooling heating and power unit 201 and a separate power supply 202, the combined cooling and power unit 201 is electrically connected to the power distribution unit 100, and the separate power unit 202 delivers energy generated by the combined cooling and power unit 201.
The combined cooling, heating and power generation component 201 comprises a thermal power element 201a and an electric power element 201b, wherein the thermal power element 201a is electrically connected with the self-power supply grid 102 and supplies power to the self-power supply grid 102, and the electric power element 201b is connected with the self-power supply grid 103 and obtains electric energy from the self-power supply grid.
The thermal power element 201a comprises a gas turbine 201a-1, a heat exchanger 201a-2 and an absorption chiller 201a-3, the heat exchanger 201a-2 and the absorption chiller 201a-3 are connected with the gas turbine 201a-1, and the gas turbine 201a-1 is electrically connected with the self-power supply network 102.
The gas turbine 201a-1 is fueled by natural gas.
The electric power element 201b comprises an electric boiler 201b-1 and an electric refrigerator 201b-2, and the electric boiler 201b-1 and the electric refrigerator 201b-2 are both connected with the self-service power grid 103.
The separate generation supply 202 comprises a heat supply chain 202a, a cold supply chain 202b and a cooling and heating user 202c, wherein the heat supply chain 202a, the cold supply chain 202b and the self-service power grid 103 are connected with the cooling and heating user 202c to supply energy to the cooling and heating user 202 c.
The heat supply chain 202a comprises an electric heating line 202a-1 and a thermal heating line 202a-2, wherein the electric heating line 202a-1 is connected with the electric boiler 201b-1, and the thermal heating line 202a-2 is connected with the heat exchanger 201 a-2.
The cold supply chain 202b comprises an electric refrigeration line 202b-1 and a thermal refrigeration line 202b-2, wherein the electric refrigeration line 202b-1 is connected with the electric refrigerator 201b-2, and the thermal refrigeration line 202b-2 is connected with the absorption refrigerator 201 a-3.
In the embodiment, the demand of the cooling, heating and power consumer 202c for energy supplies power for electric power, heat energy and cooling load, the electric power is obtained from the self-power grid 103, the heat energy source comprises an electric boiler 201b-1 and a heat exchanger 201a-2 which are respectively transmitted by an electric heating line 202a-1 and a heating and heating line 202a-2, and the cooling load energy supply source comprises an electric refrigerator 201b-2 and an absorption refrigerator 201a-3 which are respectively transmitted by an electric cooling line 202b-1 and a heating and cooling line 202 b-2.
The ratio of the heat supply amount of the power supply line 202a-1 to the total heat supply amount of the heat supply chain 202a is 0.5.
The ratio of the cooling capacity of the electric cooling line 202b-1 to the total cooling capacity of the cold supply chain 202b is 0.8.
Referring to fig. 6, the optimal ratio of the heat supply amount of the electric power heating line 202a-1 to the total heat supply amount of the heat supply chain 202a and the optimal ratio of the cold supply amount of the electric power cooling line 202b-1 to the total cold supply amount of the cold supply chain 202b are calculated.
Let X be the ratio of the heat supply amount of the power supply line 202a-1 to the total heat supply amount of the heat supply chain 202a1The ratio of the heat supply amount of the thermal power supply line 202a-2 to the total heat supply amount of the heat supply chain 202a is 1-X1(ii) a Electric refrigeratingThe ratio of the cooling capacity of line 202b-1 to the total cooling capacity of the cold supply chain 202b is X2(ii) a The ratio of the cooling capacity of the thermal refrigeration line 202b-2 to the total cooling capacity of the cold supply chain 202b is 1-X2(ii) a It is noted that the ratio of the power generation amount of the gas turbine 201a-1, i.e., the power supply amount to the self-power grid 102 to the power amount externally paid from the power grid 103 is X3Then, the following calculation is performed:
the user's thermal load Qeh is provided by two parts: qeh＝Qeb+Qh
Qeh is the user heat demand, kW; qeb is the heat generated by the electric boiler, kW; qh is the heat produced by the flue gas-water heat exchanger, kW.
The ratio of the heat supply of the electricity-taking boiler to the total heat supply
For key parameters of heat supply, the heat supply is co-produced:
Qh＝(1-X1)Qeh
electricity consumption of electric boiler:
flue gas heat required by the flue gas-water heat exchanger:
in the formula, η eb is the boiler efficiency, and η he is the heat exchange efficiency of the flue gas-water heat exchanger.
The exhaust gas waste heat Qgt of the gas turbine comprises flue gas heat Qrh required by a flue gas-water heat exchanger and flue gas heat Qrc required by an absorption refrigerating unit in the system, namely:
the cooling load Qc of the user is provided by two parts: qc＝Qac+QecIn the formula, Qc is the user cold quantity requirement, kW; qac is the refrigerating capacity of the absorption refrigerating unit, kW; qec is an electric refrigerating unit for refrigerating, kW;
ratio of cooling capacity of electricity-taking electric refrigerator to total cooling capacity
The key parameter of cooling, then the cooling capacity is co-produced:
Qac＝(1-X2)Qc
flue gas heat required by the absorption refrigeration unit Qrc:
electricity usage Eec for electric refrigerator:
in the formula, COPR is absorption refrigerator COP; COPer is the electrical refrigerator COP.
The system power balance can be expressed as:
Esup＝Eu+Eec+Eeb
Esup＝Ebuy+Egt
in the formula, Esup is total system power supply amount, kW; eu is user electrical load, kW; ebuy is the power supply quantity of a power grid, kW; egt is the generated energy of the gas turbine, kW
The proportion of the generated energy of the gas turbine to the total power supply is taken as
Key parameters of power supply, power supply amount of a power grid: ebuy＝(1-X3)Esup
When X is present3<1 hour, Ebuy>0, at the moment, the gas turbine generates insufficient power and needs to purchase power to a power grid;
when X is present3When the power consumption of the gas turbine is equal to 1, Ebuy is equal to 0, the power generation amount of the gas turbine is equal to the power consumption of a user, and the electricity buying amount and the electricity selling amount are both 0;
when X is present3>1 hour, Ebuy<And 0, the power generation capacity of the gas turbine has surplus at the moment, and the surplus power can be sold to the power grid.
The system is designed and operated in a 'heating and power' mode,when the exhaust gas waste heat Qgt of the gas turbine is determined, the power generation amount Egt of the gas turbine is also determined, and when X1 and X2 are determined, X3Is also determined accordingly, so X3Not an independent parameter.
Finally, the annual total cost is used as an evaluation index of system scheme selection, wherein the evaluation index comprises two parts of annual operation cost and initial investment depreciation cost, and the formula is shown.
Wherein Ccap is the annual total cost of the system; coperration is annual operating cost, Yuan; cinvest is the initial investment cost, Yuan; and n is the depreciation age.
Coperation＝JsDs+JwDw+JtDt
Js, Jw and Jt are respectively the daily operating cost of summer, winter and transition season; ds, Dw, Dt are days in summer, winter and transition seasons, respectively.
The daily operation cost J is the sum of the operation costs of all time periods of the whole day, and the operation cost of the kth time period is the sum of the consumption cost of the natural gas of the prime motor and the electricity purchasing cost from the power grid.
In the formula (I), the compound is shown in the specification,
selling electricity for the power grid in each period of time by unit/kWh;
unit price per unit of natural gas consumed for gas turbines, yuan/m 3; lhv is natural gas lower calorific value, MJ/m 3.
Example 3
The following calculations were performed for X1 and X2 in combination with actual parameters:
user parameters: fig. 7 is a schematic diagram of the changes in cooling, heating and electrical loads in typical 24h days in summer (96d), winter (110d) and transition season (159d) of the user. As can be seen, the power consumption in the three seasons varied in a similar manner over 24 hours a day. However, the demands of the cold load and the heat load are greatly different along with the change of different seasons, and the demands are particularly shown in that the cold load is only in summer, the heat load comprises a winter heating load and domestic hot water, the domestic hot water is supplied in all three seasons, and the demands of the summer and the transition season are higher in 14:00-19:00 than in the same time period in winter.
Equipment parameters: for the above users, the main equipment energy efficiency parameters of the hybrid distributed energy supply system, including the efficiency of the electric boiler 2 and the smoke-water heat exchanger 3 and the COP of the refrigerating unit, are shown in table 1.
TABLE 1 Primary Equipment energy efficiency parameters
Price parameters are as follows:
the energy prices related to the system are shown in table 2, wherein the electricity price adopts time-of-use electricity price, electricity selling amount of a power grid of 7: 00-23: 00 is 1.065 yuan/kWh, and electricity selling amount of 23: 00-7: 00 is 0.511 yuan/kWh.
Table 3 gives the major equipment costs involved in the system, as determined by the price per unit of capacity.
Establishing a relation graph of X1 and X2 and the annual total cost Ccap of FIG. 8, and showing that: when X is present1＝0.5、X2At 0.8, Ccapital reaches a minimum value. The waste heat supply of a single gas turbine of the gas turbine is high, the power of the gas turbine is low, and Ccapital is relatively lower. It follows that, under the present conditions, the hybrid distributed energy supply scheme consisting of gas turbine cogeneration and electric refrigeration is the lowest annual total costThe scheme (2).
In FIG. 8, when X is1＝0.9，X2The system is a pure production system when the product is 1, and the cost is 6.5 x 10 as can be seen from the figure6～7*106Between the elements, when X2＝0，X1At 0, the system is a pure cogeneration system, with a cost of 7.5 x 106～8.0*106Between elements, and X1＝0.5、X2The total cost of the hybrid system at 0.8 is 6.0 x 106The advantages of the system in saving the annual total cost can be seen from the following.
It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the invention, or those unrelated to enabling the invention).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
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