CN111817340A - Renewable energy comprehensive utilization system of sewage plant - Google Patents
Renewable energy comprehensive utilization system of sewage plant Download PDFInfo
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- 239000010865 sewage Substances 0.000 title claims abstract description 362
- 238000010248 power generation Methods 0.000 claims abstract description 86
- 238000010438 heat treatment Methods 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 71
- 230000005611 electricity Effects 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 8
- 238000012423 maintenance Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000005265 energy consumption Methods 0.000 abstract description 10
- 239000002918 waste heat Substances 0.000 abstract description 8
- 230000001932 seasonal effect Effects 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 19
- 125000004122 cyclic group Chemical group 0.000 description 6
- 230000005855 radiation Effects 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
- F24F2005/0064—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground using solar energy
- F24F2005/0067—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground using solar energy with photovoltaic panels
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a renewable energy comprehensive utilization system for a sewage plant, which comprises a photovoltaic power generation system and a sewage heat source heating and refrigerating system, wherein the photovoltaic power generation system supplies power to a sewage treatment and sewage heat source heating and refrigerating system and a municipal power grid, and the sewage heat source heating and refrigerating system provides a cold and heat source for the sewage plant. The invention fully utilizes the solar energy of the sewage plant and the waste heat of the municipal sewage, establishes the optimal model of the installed capacity of the photovoltaic power generation according to the electric energy consumption and the photovoltaic power generation characteristics of the sewage plant, fully utilizes the solar energy, reduces the electric energy consumption of the sewage plant, saves the construction cost of the photovoltaic equipment and reduces the environmental pollution caused by coal-fired power generation. Meanwhile, the invention utilizes the seasonal temperature change characteristic of the municipal sewage to supply cold and heat for the sewage plant by the sewage, further reduces the energy consumption of the sewage plant and fully utilizes the renewable energy of the sewage plant.
Description
Technical Field
The invention relates to the technical field of renewable energy utilization of sewage plants, in particular to a renewable energy comprehensive utilization system of a sewage plant.
Background
Under the severe situation of continuous increase of energy demand and increasing shortage of energy supply, renewable energy is more and more emphasized by the characteristic of recycling without human participation, and development and utilization of renewable energy become important research and development directions in the energy field.
The sewage plant in the city is mainly used for treating waste water which cannot be directly discharged, such as municipal sewage, but the municipal sewage is also a high-quality low-temperature heat source, and comprises waste heat in the life production process, the annual flow change is small and stable, the municipal sewage temperature is lower than the outdoor temperature in summer, the municipal sewage temperature is higher than the outdoor temperature in winter, the urban sewage temperature difference is particularly obvious in regions with large annual temperature difference, and meanwhile, the water temperature fluctuation of the municipal sewage in the whole heating season and the whole cooling season is not large. The water temperature of municipal sewage is related to the water treatment amount, the region, the sewage source, the season and the like, and generally ranges from 10 ℃ to 25 ℃ throughout the year. However, the traditional sewage plant cannot effectively utilize the waste heat of the municipal sewage, and the same sewage plant has very limited utilization of renewable energy sources such as solar energy and the like, which causes energy waste, so that a set of renewable energy source utilization system applied to the sewage plant needs to be developed to realize the maximization of the utilization of the renewable energy sources of the sewage plant.
Disclosure of Invention
The invention aims to provide a sewage plant renewable energy comprehensive utilization system, which fully utilizes solar energy and waste heat in municipal sewage, establishes a photovoltaic power generation system and a sewage waste heat utilization system of a sewage plant according to the supply and demand relationship of the sewage plant and the seasonal temperature change characteristics of the municipal sewage, reduces the electric energy consumption of the sewage plant, saves energy, reduces environmental pollution and realizes the maximization of the renewable energy utilization of the sewage plant.
In order to solve the technical problems, the invention adopts the following technical scheme: a sewage plant renewable energy comprehensive utilization system comprises a photovoltaic power generation system and a sewage heat source heating and refrigerating system, wherein the photovoltaic power generation system supplies power to a sewage treatment and sewage heat source heating and refrigerating system and a municipal power grid, and the sewage heat source heating and refrigerating system provides a cold and heat source for a sewage plant.
In daily operation of the sewage plant, the consumption of electric energy is indispensable, the residual space of the sewage plant area and the solar energy of the location of the sewage plant are reasonably utilized by the photovoltaic power generation system, the generated energy of the photovoltaic power generation system is used for supplying sewage treatment, a sewage heat source heating and refrigerating system, daily office work of the sewage plant and the like, and the residual electric energy is sold on the internet. Meanwhile, the temperature of the municipal sewage is lower than the air temperature in summer, and the temperature of the municipal sewage is higher than the air temperature in winter.
In the above-mentioned comprehensive utilization system of renewable energy of sewage plant, the photovoltaic power generation system is a distributed photovoltaic system, and the installed capacity of the photovoltaic power generation system is calculated according to the following calculation formula,
Ephotovoltaic actual power generation capacity≥EActual electricity consumption
Where P is the output power of the photovoltaic cell, t1 is the start time, t2 is the end time, EPhotovoltaic power generation capacityThe power generation amount of the photovoltaic power generation system in the time period from t1 to t 2. Wherein k1 is system efficiency, k1 is 80.9%, k2 is attenuation rate of photoelectric conversion efficiency, and EPhotovoltaic actual power generation capacityAnd the final generated energy of the photovoltaic power generation system. In the formula EActual electricity consumptionThe actual electricity consumption of the sewage plant in production.
For distributed photovoltaics, it is most economical for the generated energy to meet the demands of the user. In order to ensure the balance between the power consumption of the sewage plant and the supply and demand of the photovoltaic power generation amount, an optimization model is established by taking the optimal power generation amount as a target function, taking the photovoltaic output as a variable and meeting the daytime power consumption of the sewage plant as a constraint condition.
And carrying out matching analysis on the output force of the photovoltaic power generation and the load curve according to the solar resource condition and the load characteristic condition of the region where the sewage plant is located. The photovoltaic output characteristics in different seasons and different time periods are greatly different, the photovoltaic power generation and the sunlight radiation quantity are in positive correlation, the solar photovoltaic cell has different operating powers in different seasons due to different solar radiation quantities in different seasons, the optimization model respectively calculates the operating powers by taking different seasons as objects, and the distributed photovoltaic installed capacity is selected by integrating the power generation quantity in each season and the self-utilization rate.
The solar radiation amount in four seasons of spring, summer, autumn and winter shows regular change, and according to statistical analysis, the change condition of the seasonal radiation amount is that the spring is more than summer and the autumn is more than winter. The solar radiation quantity is increased and then reduced in a day, and changes in a unimodal shape. The time period of greater photovoltaic output is centered at 10: 00-14: 00, the photovoltaic power generation amount in the period meets the power consumption amount in the corresponding period of the sewage plant, so that the electricity charge can be saved, the installed capacity can be controlled, and the construction cost and the maintenance cost of the photovoltaic power generation system are reduced. But different seasons typically 10: 00-14: 00 the installed capacity of the power consumption meeting the corresponding time interval of the sewage plant is necessarily different, if the power consumption in spring is met, the installed capacity is smaller, and if the power consumption in the whole year is met, the installed capacity is too large, and the self-power consumption is redundant. Therefore, the intermediate value of the installed capacity which meets the requirements of using two electric quantities in summer and autumn is taken as the optimal installed capacity in comprehensive consideration.
In the above-mentioned renewable energy comprehensive utilization system of sewage plant, the photovoltaic power generation system includes photovoltaic array, collection flow box, direct current case, dc-to-ac converter and the system of stepping up, the electric quantity that the photovoltaic array produced supplies power to the sewage plant through collection flow box, direct current case and dc-to-ac converter in order, and when the electric quantity that the photovoltaic array produced was greater than sewage plant power consumption, photovoltaic array residual capacity supplied power to municipal power grid through collection flow box, direct current case, dc-to-ac converter and the device of stepping up in order. When the electric quantity generated by the photovoltaic array is less than the power consumption of the sewage plant, the municipal power grid supplies insufficient electric quantity to the sewage plant. As mentioned above, the photovoltaic power generation system cannot be equal to the power consumption of the sewage plant at any time, so that the residual power and the power are insufficient, and the regulation is required through the municipal power grid.
In the sewage plant renewable energy comprehensive utilization system, the reclaimed water produced in the sewage plant is used for cleaning the photovoltaic power generation system for daily cleaning and maintenance. The sewage plant is used for treating municipal sewage and producing reclaimed water, and the daily cleaning and maintenance of the photovoltaic power generation equipment need to use clean water, so that the clean water is provided nearby by the sewage plant, the pipeline transportation cost is reduced, and the water resource is saved.
In the renewable energy comprehensive utilization system of the sewage plant, the sewage heat source heating and refrigerating system comprises a sewage pool, a sewage circulating pipeline, a sewage pump, a sewage heat exchange pipe, a sewage heat exchanger, an intermediate circulating pipeline, an intermediate pump, an intermediate front-end heat exchange pipe, an intermediate rear-end heat exchange pipe, a heat pump unit, a tail-end circulating pipeline, a tail-end pump, a tail-end heat exchange pipe and a fan coil, wherein the sewage pool is connected with the sewage circulating pipeline, the sewage circulating pipeline is connected with one end of the sewage heat exchange pipe, the other end of the sewage heat exchange pipe is connected with the sewage pool through the sewage circulating pipeline, the sewage pump is arranged on the sewage circulating pipeline, and.
The heat exchange tube at the front end of the medium is arranged in the sewage heat exchanger and is connected with a medium circulating pipeline, the medium circulating pipeline is further connected with one end of the heat exchange tube at the rear end of the medium, the other end of the heat exchange tube at the rear end of the medium is connected with the heat exchange tube at the front end of the medium through the medium circulating pipeline, a medium pump is arranged on the medium circulating pipeline, and the heat exchange tube at the rear end of the medium is arranged in the heat pump unit.
The tail end heat exchange tube is arranged in the heat pump unit, one end of the tail end heat exchange tube is connected with the other end of the tail end heat exchange tube through a tail end circulating pipeline, and the tail end pump and the fan coil are sequentially arranged on the tail end circulating pipeline. The sewage heat source heating and refrigerating system of the invention is divided into a sewage circulation process, an intermediate circulation process and a tail end circulation process.
In the sewage plant renewable energy comprehensive utilization system, the circulating heat exchange process of the sewage heat source heating and refrigerating system when the sewage is at a low temperature in summer is that the sewage circulates through the sewage pool, the sewage circulating pipeline and the sewage heat exchange pipe, the sewage exchanges heat with the water in the sewage heat exchanger and the heat exchange pipe at the front end of the medium, and the temperature in the sewage rises. Water in the heat exchange tube at the front end of the medium circulates through the heat exchange tube at the front end of the medium, the circulating pipeline at the front end of the medium and the heat exchange tube at the rear end of the medium, the water in the heat exchange tube at the front end of the medium exchanges heat with the water in the heat exchange tube at the tail end in the heat pump unit, the temperature of the water in the heat exchange tube at the front end of the medium is increased, the water in the heat exchange tube at the tail end circulates in the heat exchange tube at the tail end and the. In summer, the temperature of the municipal sewage is lower than the air temperature, and the purpose of supplying cold to a sewage plant is realized by utilizing the lower temperature of the municipal sewage and carrying out twice heat exchange through the sewage heat exchanger and the heat pump unit.
In the renewable energy comprehensive utilization system of the sewage plant, the sewage heat source heating and refrigerating system performs the circulating heat exchange process when the sewage is at a high temperature in winter, wherein the sewage circulates through the sewage pool, the sewage circulating pipeline and the sewage heat exchange pipe, the sewage exchanges heat with the water in the sewage heat exchanger and the heat exchange pipe at the front end of the medium, and the temperature in the sewage is reduced. Water in the heat exchange tube at the front end of the medium circulates through the heat exchange tube at the front end of the medium, the circulating pipeline at the front end of the medium and the heat exchange tube at the rear end of the medium, the water in the heat exchange tube at the front end of the medium exchanges heat with the water in the heat exchange tube at the tail end in the heat pump unit, the temperature of the water in the heat exchange tube at the front end of the medium is reduced, the water in the heat exchange tube at the tail end circulates in the heat exchange tube at the tail end and. In winter, the temperature of the municipal sewage is higher than the air temperature, and the purpose of heating a sewage plant is achieved by utilizing the higher temperature of the municipal sewage through twice heat exchange of the sewage heat exchanger and the heat pump unit.
Compared with the prior art, the invention has the advantages that: the utility model provides a sewage factory renewable energy comprehensive utilization system, according to the electric energy consumption and the photovoltaic power generation characteristic of sewage factory, establish the optimal model of photovoltaic power generation installed capacity, make full use of solar energy, when reducing sewage factory electric energy consumption, save the construction cost of photovoltaic equipment, reduce the environmental pollution that coal-fired electricity generation caused. Meanwhile, the invention utilizes the seasonal temperature change characteristic of the municipal sewage to supply cold and heat for the sewage plant by the sewage, further reduces the energy consumption of the sewage plant and fully utilizes the renewable energy of the sewage plant.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic flow diagram of a photovoltaic power generation system of the present invention;
FIG. 3 is a schematic diagram of the cooling process of the sewage heat source heating and cooling system of the present invention;
FIG. 4 is a schematic diagram of the heating process of the sewage heat source heating and cooling system of the present invention;
fig. 5 is a graph showing a relationship between a photovoltaic power generation output and a power load.
The meaning of the reference numerals: the system comprises a photovoltaic power generation system 1, a sewage heat source heating and refrigerating system 2, a photovoltaic array 3, a confluence box 4, a direct current box 5, an inverter 6, a booster 7, a sewage pool 8, a sewage circulating pipeline 9, a sewage pump 10, a sewage heat exchange pipe 11, a sewage heat exchanger 12, an intermediate circulating pipeline 13, an intermediate pump 14, an intermediate front-end heat exchange pipe 15, an intermediate rear-end heat exchange pipe 16, a heat pump unit 17, an end circulating pipeline 18, an end pump 19, an end heat exchange pipe 20 and a fan coil 21.
The invention is further described with reference to the following figures and detailed description.
Detailed Description
Example 1 of the invention: as shown in fig. 1, the present embodiment is a system for comprehensively utilizing renewable energy of a sewage plant, and the present embodiment includes a photovoltaic power generation system 1 and a sewage heat source heating and cooling system 2, wherein the photovoltaic power generation system 1 supplies power to the sewage treatment, sewage heat source heating and cooling system 2 and a municipal power grid, and the sewage heat source heating and cooling system 2 provides a cold and heat source for the sewage plant. In the embodiment, the photovoltaic power generation system 1 is built by utilizing the vacant space of the sewage plant, the photovoltaic power generation system 1 provides electric energy for the sewage plant, and the sewage heat source heating and refrigerating system 2 can supply cold for the sewage plant.
As shown in fig. 2, the photovoltaic power generation system 1 described in this embodiment includes a photovoltaic array 3, a combiner box 4, a dc box 5, an inverter 6, and a voltage boosting system 7, wherein the power generated by the photovoltaic array 3 is supplied to the sewage plant through the combiner box 4, the dc box 5, and the inverter 6 in sequence, and when the power generated by the photovoltaic array 3 is greater than the power consumption of the sewage plant, the residual power of the photovoltaic array 3 is supplied to the municipal power grid through the combiner box 4, the dc box 5, the inverter 6, and the voltage boosting device 7 in sequence. When the electric quantity generated by the photovoltaic array 3 is less than the power consumption of the sewage plant, insufficient electric quantity is supplemented to the sewage plant by the municipal power grid, the electric energy consumption of the sewage plant is reduced, and the utilization of renewable energy of the sewage plant is realized.
The reclaimed water produced in the sewage plant in the embodiment is used for daily cleaning and maintenance of the photovoltaic power generation system 1, the reclaimed water produced by the sewage plant is utilized nearby, and water resources are saved.
As shown in fig. 3, the sewage heat source heating and refrigerating system 2 in this embodiment includes a sewage tank 8, a sewage circulation pipeline 9, a sewage pump 10, a sewage heat exchange pipe 11, a sewage heat exchanger 12, an intermediate circulation pipeline 13, an intermediate pump 14, an intermediate front heat exchange pipe 15, an intermediate rear heat exchange pipe 16, a heat pump unit 17, a terminal circulation pipeline 18, a terminal pump 19, a terminal heat exchange pipe 20, and a fan coil 21, where the sewage tank 8 is connected to the sewage circulation pipeline 9, the sewage circulation pipeline 9 is connected to one end of the sewage heat exchange pipe 11, the other end of the sewage heat exchange pipe 11 is connected to the sewage tank 8 through the sewage circulation pipeline 9, the sewage pump 10 is disposed on the sewage circulation pipeline 9, and the sewage heat exchange pipe 11 is disposed in the sewage.
The heat exchange tube 15 at the front end of the medium is arranged in the sewage heat exchanger 12, the heat exchange tube 15 at the front end of the medium is connected with the circulating pipeline 13 of the medium, the circulating pipeline 13 of the medium is also connected with one end of the heat exchange tube 16 at the rear end of the medium, the other end of the heat exchange tube 16 at the rear end of the medium is connected with the heat exchange tube 15 at the front end of the medium through the circulating pipeline 13 of the medium, the medium pump 14 is arranged on the circulating pipeline 13 of the medium, and the heat exchange.
The tail end heat exchange tube 20 is arranged in the heat pump unit 17, one end of the tail end heat exchange tube 20 is connected with the other end of the tail end heat exchange tube 20 through a tail end circulating pipeline 18, and the tail end pump 19 and the fan coil 21 are sequentially arranged on the tail end circulating pipeline 18. This embodiment carries out twice heat transfer through sewage cycle process, intermediary's cyclic process and terminal cyclic process, has effectively utilized municipal sewage's waste heat, reduces the energy resource consumption of sewage factory.
As shown in fig. 3, in the circulation heat exchange process of the sewage heat source heating and cooling system 2 described in this embodiment, when the temperature of the sewage is low in summer, the sewage circulates through the sewage pool 8, the sewage circulation pipeline 9 and the sewage heat exchange pipe 11, the sewage exchanges heat with the water in the intermediate front end heat exchange pipe 15 in the sewage heat exchanger 12, and the temperature of the sewage rises. Water in the intermediate front-end heat exchange tube 15 circulates through the intermediate front-end heat exchange tube 15, the intermediate circulating pipeline 13 and the intermediate rear-end heat exchange tube 16, the water in the intermediate front-end heat exchange tube 15 exchanges heat with water in the tail-end heat exchange tube 20 in the heat pump unit 17, the temperature of the water in the intermediate front-end heat exchange tube 15 is increased, the water in the tail-end heat exchange tube 20 circulates in the tail-end heat exchange tube 20 and the tail-end circulating pipeline 18, and the water is cooled outwards through the fan coil 21. In the embodiment, municipal sewage at 25 ℃ is subjected to heat exchange twice, so that the heat production temperature of the fan coil 21 reaches 5-10 ℃ and cold supply is performed to a sewage plant.
Example 2 of the invention: as shown in fig. 1, the present embodiment is a system for comprehensively utilizing renewable energy of a sewage plant, and the present embodiment includes a photovoltaic power generation system 1 and a sewage heat source heating and cooling system 2, wherein the photovoltaic power generation system 1 supplies power to the sewage treatment, sewage heat source heating and cooling system 2 and a municipal power grid, and the sewage heat source heating and cooling system 2 provides a cold and heat source for the sewage plant. In the embodiment, the photovoltaic power generation system 1 is built by utilizing the vacant space of the sewage plant, the photovoltaic power generation system 1 provides electric energy for the sewage plant, and the sewage heat source heating and refrigerating system 2 can supply cold for the sewage plant.
The photovoltaic power generation system 1 described in this embodiment is a distributed photovoltaic system, the installed capacity of the photovoltaic power generation system 1 is calculated according to the following calculation formula,
Ephotovoltaic actual power generation capacity≥EActual electricity consumption
Where P is the output power of the photovoltaic cell, t1 is the start time, t2 is the end time, EPhotovoltaic power generation capacityThe power generation amount of the photovoltaic power generation system 1 in the time period from t1 to t 2. Wherein k1 is system efficiency, k1 is 80.9%, k2 is attenuation rate of photoelectric conversion efficiency, and EPhotovoltaic actual power generation capacityIs the final power generation amount of the photovoltaic power generation system 1. In the formula EActual electricity consumptionThe actual electricity consumption of the sewage plant in production.
As shown in fig. 5, according to the solar energy resource status and the load characteristic condition of the region where the sewage plant is located in the embodiment, the matching analysis of the photovoltaic power generation output and the load curve is performed. The optimization model respectively calculates the operating power by taking different seasons as objects, selects the distributed photovoltaic installed capacity by integrating the generated energy and the utilization rate of each season, and finally determines the installed capacity by taking the intermediate value of the installed capacity meeting the requirements of using two electric quantities in summer and autumn as the installed capacity.
As shown in fig. 2, the photovoltaic power generation system 1 described in this embodiment includes a photovoltaic array 3, a combiner box 4, a dc box 5, an inverter 6, and a voltage boosting system 7, wherein the power generated by the photovoltaic array 3 is supplied to the sewage plant through the combiner box 4, the dc box 5, and the inverter 6 in sequence, and when the power generated by the photovoltaic array 3 is greater than the power consumption of the sewage plant, the residual power of the photovoltaic array 3 is supplied to the municipal power grid through the combiner box 4, the dc box 5, the inverter 6, and the voltage boosting device 7 in sequence. When the electric quantity generated by the photovoltaic array 3 is less than the power consumption of the sewage plant, insufficient electric quantity is supplemented to the sewage plant by the municipal power grid, the electric energy consumption of the sewage plant is reduced, and the utilization of renewable energy of the sewage plant is realized.
The reclaimed water produced in the sewage plant in the embodiment is used for daily cleaning and maintenance of the photovoltaic power generation system 1, the reclaimed water produced by the sewage plant is utilized nearby, and water resources are saved.
As shown in fig. 3, the sewage heat source heating and refrigerating system 2 in this embodiment includes a sewage tank 8, a sewage circulation pipeline 9, a sewage pump 10, a sewage heat exchange pipe 11, a sewage heat exchanger 12, an intermediate circulation pipeline 13, an intermediate pump 14, an intermediate front heat exchange pipe 15, an intermediate rear heat exchange pipe 16, a heat pump unit 17, a terminal circulation pipeline 18, a terminal pump 19, a terminal heat exchange pipe 20, and a fan coil 21, where the sewage tank 8 is connected to the sewage circulation pipeline 9, the sewage circulation pipeline 9 is connected to one end of the sewage heat exchange pipe 11, the other end of the sewage heat exchange pipe 11 is connected to the sewage tank 8 through the sewage circulation pipeline 9, the sewage pump 10 is disposed on the sewage circulation pipeline 9, and the sewage heat exchange pipe 11 is disposed in the sewage.
The heat exchange tube 15 at the front end of the medium is arranged in the sewage heat exchanger 12, the heat exchange tube 15 at the front end of the medium is connected with the circulating pipeline 13 of the medium, the circulating pipeline 13 of the medium is also connected with one end of the heat exchange tube 16 at the rear end of the medium, the other end of the heat exchange tube 16 at the rear end of the medium is connected with the heat exchange tube 15 at the front end of the medium through the circulating pipeline 13 of the medium, the medium pump 14 is arranged on the circulating pipeline 13 of the medium, and the heat exchange.
The tail end heat exchange tube 20 is arranged in the heat pump unit 17, one end of the tail end heat exchange tube 20 is connected with the other end of the tail end heat exchange tube 20 through a tail end circulating pipeline 18, and the tail end pump 19 and the fan coil 21 are sequentially arranged on the tail end circulating pipeline 18. This embodiment carries out twice heat transfer through sewage cycle process, intermediary's cyclic process and terminal cyclic process, has effectively utilized municipal sewage's waste heat, reduces the energy resource consumption of sewage factory.
As shown in fig. 3, in the circulation heat exchange process of the sewage heat source heating and cooling system 2 described in this embodiment, when the temperature of the sewage is low in summer, the sewage circulates through the sewage pool 8, the sewage circulation pipeline 9 and the sewage heat exchange pipe 11, the sewage exchanges heat with the water in the intermediate front end heat exchange pipe 15 in the sewage heat exchanger 12, and the temperature of the sewage rises. Water in the intermediate front-end heat exchange tube 15 circulates through the intermediate front-end heat exchange tube 15, the intermediate circulating pipeline 13 and the intermediate rear-end heat exchange tube 16, the water in the intermediate front-end heat exchange tube 15 exchanges heat with water in the tail-end heat exchange tube 20 in the heat pump unit 17, the temperature of the water in the intermediate front-end heat exchange tube 15 is increased, the water in the tail-end heat exchange tube 20 circulates in the tail-end heat exchange tube 20 and the tail-end circulating pipeline 18, and the water is cooled outwards through the fan coil 21. In the embodiment, municipal sewage at 25 ℃ is subjected to heat exchange twice, so that the heat production temperature of the fan coil 21 reaches 5-10 ℃ and cold supply is performed to a sewage plant.
Example 3 of the invention: as shown in fig. 1, the present embodiment is a system for comprehensively utilizing renewable energy of a sewage plant, and the present embodiment includes a photovoltaic power generation system 1 and a sewage heat source heating and cooling system 2, wherein the photovoltaic power generation system 1 supplies power to the sewage treatment, sewage heat source heating and cooling system 2 and a municipal power grid, and the sewage heat source heating and cooling system 2 provides a cold and heat source for the sewage plant. In the embodiment, the photovoltaic power generation system 1 is built by utilizing the vacant space of the sewage plant, the photovoltaic power generation system 1 provides electric energy for the sewage plant, and the sewage heat source heating and refrigerating system 2 can supply cold for the sewage plant.
The photovoltaic power generation system 1 described in this embodiment is a distributed photovoltaic system, the installed capacity of the photovoltaic power generation system 1 is calculated according to the following calculation formula,
Ephotovoltaic actual power generation capacity≥EActual electricity consumption
Where P is the output power of the photovoltaic cell, t1 is the start time, t2 is the end time, EPhotovoltaic power generation capacityThe power generation amount of the photovoltaic power generation system 1 in the time period from t1 to t 2. Wherein k1 is system efficiency, k1 is 80.9%, k2 is attenuation rate of photoelectric conversion efficiency, and EPhotovoltaic actual power generation capacityIs the final power generation amount of the photovoltaic power generation system 1. In the formula EActual electricity consumptionThe actual electricity consumption of the sewage plant in production.
As shown in fig. 5, according to the solar energy resource status and the load characteristic condition of the region where the sewage plant is located in the embodiment, the matching analysis of the photovoltaic power generation output and the load curve is performed. The optimization model respectively calculates the operating power by taking different seasons as objects, selects the distributed photovoltaic installed capacity by integrating the generated energy and the utilization rate of each season, and finally determines the installed capacity by taking the intermediate value of the installed capacity meeting the requirements of using two electric quantities in summer and autumn as the installed capacity.
As shown in fig. 2, the photovoltaic power generation system 1 described in this embodiment includes a photovoltaic array 3, a combiner box 4, a dc box 5, an inverter 6, and a voltage boosting system 7, wherein the power generated by the photovoltaic array 3 is supplied to the sewage plant through the combiner box 4, the dc box 5, and the inverter 6 in sequence, and when the power generated by the photovoltaic array 3 is greater than the power consumption of the sewage plant, the residual power of the photovoltaic array 3 is supplied to the municipal power grid through the combiner box 4, the dc box 5, the inverter 6, and the voltage boosting device 7 in sequence. When the electric quantity generated by the photovoltaic array 3 is less than the power consumption of the sewage plant, insufficient electric quantity is supplemented to the sewage plant by the municipal power grid, the electric energy consumption of the sewage plant is reduced, and the utilization of renewable energy of the sewage plant is realized.
The reclaimed water produced in the sewage plant in the embodiment is used for daily cleaning and maintenance of the photovoltaic power generation system 1, the reclaimed water produced by the sewage plant is utilized nearby, and water resources are saved.
As shown in fig. 3, the sewage heat source heating and refrigerating system 2 in this embodiment includes a sewage tank 8, a sewage circulation pipeline 9, a sewage pump 10, a sewage heat exchange pipe 11, a sewage heat exchanger 12, an intermediate circulation pipeline 13, an intermediate pump 14, an intermediate front heat exchange pipe 15, an intermediate rear heat exchange pipe 16, a heat pump unit 17, a terminal circulation pipeline 18, a terminal pump 19, a terminal heat exchange pipe 20, and a fan coil 21, where the sewage tank 8 is connected to the sewage circulation pipeline 9, the sewage circulation pipeline 9 is connected to one end of the sewage heat exchange pipe 11, the other end of the sewage heat exchange pipe 11 is connected to the sewage tank 8 through the sewage circulation pipeline 9, the sewage pump 10 is disposed on the sewage circulation pipeline 9, and the sewage heat exchange pipe 11 is disposed in the sewage.
The heat exchange tube 15 at the front end of the medium is arranged in the sewage heat exchanger 12, the heat exchange tube 15 at the front end of the medium is connected with the circulating pipeline 13 of the medium, the circulating pipeline 13 of the medium is also connected with one end of the heat exchange tube 16 at the rear end of the medium, the other end of the heat exchange tube 16 at the rear end of the medium is connected with the heat exchange tube 15 at the front end of the medium through the circulating pipeline 13 of the medium, the medium pump 14 is arranged on the circulating pipeline 13 of the medium, and the heat exchange.
The tail end heat exchange tube 20 is arranged in the heat pump unit 17, one end of the tail end heat exchange tube 20 is connected with the other end of the tail end heat exchange tube 20 through a tail end circulating pipeline 18, and the tail end pump 19 and the fan coil 21 are sequentially arranged on the tail end circulating pipeline 18. This embodiment carries out twice heat transfer through sewage cycle process, intermediary's cyclic process and terminal cyclic process, has effectively utilized municipal sewage's waste heat, reduces the energy resource consumption of sewage factory.
As shown in fig. 3, in the circulation heat exchange process of the sewage heat source heating and cooling system 2 described in this embodiment, when the temperature of the sewage is low in summer, the sewage circulates through the sewage pool 8, the sewage circulation pipeline 9 and the sewage heat exchange pipe 11, the sewage exchanges heat with the water in the intermediate front end heat exchange pipe 15 in the sewage heat exchanger 12, and the temperature of the sewage rises. Water in the intermediate front-end heat exchange tube 15 circulates through the intermediate front-end heat exchange tube 15, the intermediate circulating pipeline 13 and the intermediate rear-end heat exchange tube 16, the water in the intermediate front-end heat exchange tube 15 exchanges heat with water in the tail-end heat exchange tube 20 in the heat pump unit 17, the temperature of the water in the intermediate front-end heat exchange tube 15 is increased, the water in the tail-end heat exchange tube 20 circulates in the tail-end heat exchange tube 20 and the tail-end circulating pipeline 18, and the water is cooled outwards through the fan coil 21. In the embodiment, municipal sewage at 25 ℃ is subjected to heat exchange twice, so that the heat production temperature of the fan coil 21 reaches 5-10 ℃ and cold supply is performed to a sewage plant.
As shown in fig. 4, in the present embodiment, the circulation heat exchange process of the sewage heat source heating and refrigerating system 2 when the sewage is at a high temperature in winter is that the sewage circulates through the sewage pool 8, the sewage circulation pipeline 9 and the sewage heat exchange pipe 11, the sewage exchanges heat with the water in the intermediate front end heat exchange pipe 15 in the sewage heat exchanger 12, and the temperature in the sewage is reduced; water in the intermediate front-end heat exchange tube 15 circulates through the intermediate front-end heat exchange tube 15, the intermediate circulating pipeline 13 and the intermediate rear-end heat exchange tube 16, the water in the intermediate front-end heat exchange tube 15 exchanges heat with water in the tail-end heat exchange tube 20 in the heat pump unit 17, the temperature of the water in the intermediate front-end heat exchange tube 15 is reduced, the water in the tail-end heat exchange tube 20 circulates in the tail-end heat exchange tube 20 and the tail-end circulating pipeline 18, and the water is heated outwards through the fan coil 21. In the embodiment, municipal sewage at 12 ℃ is subjected to heat exchange twice, so that the heat production temperature of the fan coil 21 reaches 40-45 ℃, and the sewage plant is heated.
The embodiment is adopted by a certain sewage plant, and the daily average treated water amount of the sewage plant is 4.7 ten thousand meters3And d, building a distributed photovoltaic power generation system on idle air and ground in the sewage plant, arranging a sewage heat source heating and refrigerating system (with the refrigerating input power of 28kw and the heating input power of 50kw), and carrying out comprehensive utilization of renewable energy sources. The optimal installed capacity is 1272-1346 kwp obtained through calculation of the calculation formula, the installed capacity is 1300kwp according to the condition of the air and ground in the plant, and the average generated energy per year is 152 ten thousand kW.h. Compared with a common coal-fired power plant, the standard coal 489.5t can be saved every year by calculating 320g of the standard coal consumed every degree of electricity, the emission of carbon dioxide and other atmospheric pollutants and the emission of a large amount of ash slag are reduced by 611.8t, and therefore the quality of the atmospheric environment is improved. Compared with an air conditioning system, the sewage heat source heating and refrigerating system saves electricity by 15 ten thousand kW.h each year, saves standard coal by 48.2t and reduces emission of carbon dioxide by 60.3 t. The electric quantity generated by the photovoltaic power generation system in the embodiment is mainly used for production and use of the sewage plant, the surplus electricity adopts an online operation mode, the electricity utilization characteristics of the sewage plant and the national subsidy policy are combined, the electricity cost is averagely saved by 102 ten thousand yuan each year, the surplus electricity is imported to the online by 67 thousand yuan, and the total amount is 169 ten thousand yuan.
Claims (7)
1. The utility model provides a sewage factory renewable energy comprehensive utilization system which characterized in that: the system comprises a photovoltaic power generation system (1) and a sewage heat source heating and refrigerating system (2), wherein the photovoltaic power generation system (1) supplies power to a sewage treatment and sewage heat source heating and refrigerating system (2) and a municipal power grid, and the sewage heat source heating and refrigerating system (2) provides a cold and heat source for a sewage plant.
2. The sewage plant renewable energy comprehensive utilization system of claim 1, characterized in that: the photovoltaic power generation system (1) is a distributed photovoltaic system, the installed capacity of the photovoltaic power generation system (1) is calculated according to the following calculation formula,
Ephotovoltaic actual power generation capacity≥EActual electricity consumption
Where P is the output power of the photovoltaic cell, t1 is the start time, t2 is the end time, EPhotovoltaic power generation capacityIs the power generation amount of the photovoltaic power generation system (1) in the time period of t1-t 2; wherein k1 is system efficiency, k1 is 80.9%, k2 is attenuation rate of photoelectric conversion efficiency, and EPhotovoltaic actual power generation capacityIs the final generated energy of the photovoltaic power generation system (1); in the formula EActual electricity consumptionThe actual electricity consumption of the sewage plant in production.
3. The sewage plant renewable energy comprehensive utilization system according to claim 1 or 2, characterized in that: the photovoltaic power generation system (1) comprises a photovoltaic array (3), a junction box (4), a direct current box (5), an inverter (6) and a boosting system (7), wherein electric quantity generated by the photovoltaic array (3) is supplied to a sewage plant through the junction box (4), the direct current box (5) and the inverter (6) in sequence, and when the electric quantity generated by the photovoltaic array (3) is larger than the electric quantity used by the sewage plant, the residual electric quantity of the photovoltaic array (3) is supplied to a municipal power grid through the junction box (4), the direct current box (5), the inverter (6) and the boosting device (7) in sequence; when the electric quantity generated by the photovoltaic array (3) is less than the power consumption of the sewage plant, the municipal power grid supplies insufficient electric quantity to the sewage plant.
4. The sewage plant renewable energy comprehensive utilization system of claim 3, characterized in that: the reclaimed water produced in the sewage plant is used for cleaning the photovoltaic power generation system (1) for daily cleaning and maintenance.
5. The sewage plant renewable energy comprehensive utilization system of claim 1, characterized in that: the sewage heat source heating and refrigerating system (2) comprises a sewage pool (8), a sewage circulating pipeline (9), a sewage pump (10), a sewage heat exchange pipe (11), a sewage heat exchanger (12), an intermediate circulating pipeline (13), an intermediate pump (14), an intermediate front-end heat exchange pipe (15), an intermediate rear-end heat exchange pipe (16), a heat pump unit (17), a tail-end circulating pipeline (18), a tail-end pump (19), a tail-end heat exchange pipe (20) and a fan coil (21), the sewage tank (8) is connected with a sewage circulating pipeline (9), the sewage circulating pipeline (9) is connected with one end of a sewage heat exchange pipe (11), the other end of the sewage heat exchange pipe (11) is connected with the sewage tank (8) through the sewage circulating pipeline (9), a sewage pump (10) is arranged on the sewage circulating pipeline (9), and the sewage heat exchange pipe (11) is arranged in a sewage heat exchanger (12);
the heat exchange tube (15) at the front end of the medium is arranged in the sewage heat exchanger (12), the heat exchange tube (15) at the front end of the medium is connected with a medium circulating pipeline (13), the medium circulating pipeline (13) is also connected with one end of a heat exchange tube (16) at the rear end of the medium, the other end of the heat exchange tube (16) at the rear end of the medium is connected with the heat exchange tube (15) at the front end of the medium through the medium circulating pipeline (13), a medium pump (14) is arranged on the medium circulating pipeline (13), and the heat exchange tube (16) at the rear end of the medium is arranged in a heat;
the tail end heat exchange tube (20) is arranged in the heat pump unit (17), one end of the tail end heat exchange tube (20) is connected with the other end of the tail end heat exchange tube (20) through a tail end circulating pipeline (18), and the tail end pump (19) and the fan coil (21) are sequentially arranged on the tail end circulating pipeline (18).
6. The sewage plant renewable energy comprehensive utilization system of claim 5, characterized in that: the sewage heat source heating and refrigerating system (2) has the advantages that in summer, when sewage is at a low temperature, the sewage circulates through the sewage pool (8), the sewage circulating pipeline (9) and the sewage heat exchange pipe (11), the sewage exchanges heat with water in the heat exchange pipe (15) at the front end of the medium in the sewage heat exchanger (12), and the temperature of the sewage is increased; water in the intermediate front-end heat exchange tube (15) circulates through the intermediate front-end heat exchange tube (15), the intermediate circulating pipeline (13) and the intermediate rear-end heat exchange tube (16), water in the intermediate front-end heat exchange tube (15) exchanges heat with water in the tail-end heat exchange tube (20) in the heat pump unit (17), the temperature of water in the intermediate front-end heat exchange tube (15) is increased, water in the tail-end heat exchange tube (20) circulates in the tail-end heat exchange tube (20) and the tail-end circulating pipeline (18), and cooling is supplied to the outside through the fan coil (21).
7. The sewage plant renewable energy comprehensive utilization system of claim 5, characterized in that: the sewage heat source heating and refrigerating system (2) has the advantages that in winter, when the sewage is at a high temperature, the sewage circulates through the sewage pool (8), the sewage circulating pipeline (9) and the sewage heat exchange pipe (11), the sewage exchanges heat with water in the heat exchange pipe (15) at the front end of the medium in the sewage heat exchanger (12), and the temperature in the sewage is reduced; water in the intermediate front-end heat exchange tube (15) circulates through the intermediate front-end heat exchange tube (15), the intermediate circulating pipeline (13) and the intermediate rear-end heat exchange tube (16), water in the intermediate front-end heat exchange tube (15) exchanges heat with water in the tail-end heat exchange tube (20) in the heat pump unit (17), the temperature of water in the intermediate front-end heat exchange tube (15) is reduced, water in the tail-end heat exchange tube (20) circulates in the tail-end heat exchange tube (20) and the tail-end circulating pipeline (18), and the fan coil (21) supplies heat to the outside.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114772815A (en) * | 2022-05-10 | 2022-07-22 | 中建三局绿色产业投资有限公司 | Photovoltaic power generation and sewage treatment integrated equipment and control method thereof |
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| CN114772815A (en) * | 2022-05-10 | 2022-07-22 | 中建三局绿色产业投资有限公司 | Photovoltaic power generation and sewage treatment integrated equipment and control method thereof |
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