JP3004627B2 - Operation support system for district heating and cooling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving support system for a district heating and cooling facility for supplying heat to a cooling and heating demand in a specific area.

[0002]

2. Description of the Related Art As a system for efficiently operating a cooling facility in a specific area such as a large building, there is known a system disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 5-233012. This known system includes a database in which heat load information, time information, and the like are stored, a demand forecasting calculating means for calculating chilled water calorie, time forecasting, and the like based on various information stored in the database, and a demand forecasting calculating means. Storage means for storing the demand forecast calculated by the above, and an operation mode generation means for generating an operation pattern of the cooling device. The operation mode generation means determines an operation pattern of the cooling device based on the demand forecast data stored in the storage device, the cooling capacity of the cooling device to be used, and a time factor. The system further includes operation control means for controlling the operation of the cooling device, and operation method comparison and evaluation means for correcting the operation of the cooling device. The operation control means controls the operation of the cooling device as required based on the operation pattern generated by the operation method generation means. The operation method comparison / evaluation means receives heat load information from each cooling device as feedback information, and the operation method comparison / evaluation means compares and evaluates the operation pattern of the generated operation method with the actual operation state. If there is a difference between the two, the operation correction data is sent to the operation method generation means. When the operation correction data is transmitted in this manner, the operation method generation unit corrects the operation pattern based on the operation correction data, and the operation control unit operates the cooling device as required based on the corrected operation pattern. I do.

[0003]

In the conventional system, when there is a difference between the operation pattern generated by the operation method control means and the actual operation state, the operation pattern is corrected to change the operation state of the cooling device. Although the purpose is to perform efficient operation by correcting it, the efficient operation of the system does not always match the running cost of the system, and such control is sufficient to reduce the running cost in recent years. It is difficult to respond.

Further, this known system mainly controls a cooling device, and it is difficult to apply such control to operation control of a district heating and cooling facility using a cooling device, a heating device and a steam generating device.

[0005] It is an object of the present invention to provide a driving support system capable of reducing the running cost of a district heating and cooling facility.

Another object of the present invention is to provide an operation support system for controlling the operation of a district heating and cooling facility including at least the cooling and heating equipment among the cooling and heating equipment, the heating equipment and the steam generating equipment as required. It is.

[0007]

SUMMARY OF THE INVENTION The present invention provides at least one of a cooling device and a heating device among a cooling device for generating cold water, a heating device for generating hot water, and a steam generating device for generating steam. In an operation support system in a district heating and cooling facility comprising: an operation derivation unit for determining an operation condition of each device based on a demand amount of a heat medium generated by each device and a chilled water demand amount, and the operation derivation unit. Operating condition storage means for storing the set operating conditions, wherein the operation deriving means determines at least the operating conditions of the cooling equipment, and then calculates the amount of hot water heat generated by operating the cooling equipment, The operating condition of the heating device is determined by using the device as an element for determining the operating condition of the device, and the operating condition is determined so that the running cost of each device is reduced. Determined to be a driving support system in district heating and cooling equipment according to claim.

According to the present invention, the operating condition deriving means includes at least a hot water demand of a heating medium demand corresponding to a device provided in the district cooling and heating equipment, that is, a steam demand, a hot water demand, and a cold water demand. The operating conditions of each device are determined so as to satisfy the demand and the cold water demand, and the operating conditions are determined so that the running cost of each device is reduced. Therefore, by controlling the operation of each device based on the operating conditions determined by the operating condition deriving means, it is possible to reduce the running cost of the cooling and heating equipment and perform the running cost saving operation.

[0009]

According to the present invention, when determining the control of the system, considering the difficulty of operation and control of each device, at least in the order of the cooling device and the heating device, the operation of the cooling device based on the cooling water demand is first performed. Since the operating condition of the heating equipment is determined based on the condition and then the hot water demand, various equipment constituting the cooling and heating equipment can be easily controlled.
In addition, since the operating conditions are not determined for the entire system at the same time but for at least the cooling device and the heating device in this order, the operating conditions can be determined relatively easily. In particular, according to the present invention, the amount of hot water generated by operating the cooling equipment is used as an element for determining the operating conditions of the heating equipment, whereby the order of the operating conditions can be made significant.

Further, according to the present invention, the refrigeration equipment includes a heat storage tank for generating ice and storing heat, and the operation deriving means first determines the operation conditions of the refrigeration equipment.
Considering the use of the heat storage tank, when using the heat storage tank, the operation deriving means determines the operating conditions of the heat storage tank, and then determines the operating conditions of the remaining equipment other than the heat storage tank. Features.

According to the present invention, the operating condition of the cooling / heating equipment is determined by first considering whether to use the heat storage tank included in the cooling / heating equipment. When using a heat storage tank, in order to use this heat storage tank efficiently and reduce its running cost, store ice in the heat storage tank at night and use all the stored ice in the daytime, that is, convert all the ice into cold water. It is desirable.
Therefore, when using the heat storage tank, the running cost of the cooling equipment can be reduced by determining the control of the heat storage tank with the highest priority and then determining the operating conditions of the remaining cooling equipment.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the configuration of a driving support system for a district heating / cooling system according to the present invention. FIG. 1 is a system diagram schematically showing an embodiment of a driving support system for a district heating / cooling facility according to the present invention, and FIG. 2 is a block diagram schematically showing a control system of the driving support system of FIG. .

Referring to FIGS. 1 and 2, an operation support system for a district heating / cooling system shown in FIG. 1 includes a cooling device 2 for generating cold water as a heating medium and a heating / cooling device 2 for generating hot water as a heating medium. The apparatus includes a device 4 and a steam generating device 6 for generating steam as a heat medium. These chilled water equipment 2, heating equipment 4 and steam generation equipment 6 are used for cooling and heating a specific area such as a large building or a complex structure including one or more of such buildings. Cold water, hot water and steam generated by 4, 6 are used for cooling and heating. The steam may be used not only for heating, but also for kitchens such as hotels and laundry.

Examples of the cooling equipment 2 include an absorption refrigerator 8 for cooling water using steam, a turbo refrigerator 10 for cooling water using mechanical rotational energy, and an air heat source heat pump that can also be used as a refrigerator. 12 and a heat storage tank 14 that freezes water and stores heat as ice, and the like. One or more of these devices 8, 10, 12, and 14 may be used alone or in combination of two or more. Can be configured. Further, as the heating device 4, for example, a hot water exchanger 16 for producing hot water by steam heating is used.
And an air heat source heat pump 12 that can be used as a hot water generator (this air heat source heat pump functions as a cooling device when used as a refrigerator as described above), and the like.
The heating apparatus 4 can be configured by combining one or two of the sixteen one or two or more. Further, as the steam generating device 6, for example, a co-generation 18 and a low-pressure boiler 20 of a gas turbine or a gas engine for generating steam can be used, and one or two of these devices 18, 20 are used as one unit. Alternatively, two or more steam generators 6 can be configured in combination.

In this district heating / cooling system, fuel gas such as liquefied natural gas and city gas and electric power are used as energy for operating the system. The fuel gas is used for the low pressure boiler 20 and the cogeneration 18 of the gas turbine or gas engine. Gas turbine or gas engine cogeneration 18
In connection with the low-pressure boiler 20 and a low-pressure boiler 20, a boiler makeup water source 24 utilizing tap water, groundwater, or the like is provided. Water from the boiler makeup water source 24 is supplied to the cogeneration 18 and the low-pressure boiler 20 of the gas turbine or gas engine. Is done. The low-pressure boiler 20 heats the boiler makeup water by burning the fuel gas to generate steam, and the generated steam is supplied to the low-pressure steam header 22. Further, the cogeneration 18 of the gas turbine or the gas engine rotates a turbine (not shown) or the engine by the combustion gas obtained by burning the fuel gas, transmits the rotation to a generator, generates AC power, and generates the AC power. The electric power is used as energy for operating the cooling / heating equipment 2, the heating / heating equipment 4, and the steam generating equipment 6. This gas turbine or gas engine cogeneration 18 also
The boiler water is heated by the combustion gas to generate steam, and the generated steam is sent to the low-pressure steam header 22. The AC power generated by the cogeneration 18 of the gas turbine or the gas engine is used as energy for the cooling / heating equipment 2, the heating / heating equipment 4 and the steam generating equipment 6, but when the generated power remains, A system that can be sold to a power company can also be used.

The AC power, that is, the power supplied from the power company and the power generated in the cogeneration 18 of the gas turbine or the gas engine are supplied to the turbo chiller 10 and the air heat source heat pump 12.
In this embodiment, in relation to the centrifugal chiller 10, a cooling tower makeup water source 26 using tap water, groundwater, and the like, and a cooling tower 28 to which makeup water from the cooling tower makeup water source 26 is supplied, are provided. Cooling water from the cooling tower 28 is supplied to the turbo refrigerator 10. Note that the cooling water from the cooling tower 28 is also supplied to the absorption refrigerator 8. The centrifugal chiller 10 generates cold water using the supplied AC power and the cooling water from the cooling tower 28, and the generated cold water is supplied to the cold water header 30. Air heat source heat pump 1
2, a heating tower 32 is provided, and a refrigerant is circulated between the heating tower 32 and the air heat source heat pump 12. The refrigerant from the air heat source heat pump 12 is supplied to the heating tower 32. When the air heat source heat pump 12 is used as a cooling device, the heat stored in the refrigerant is supplied to the heating tower 32.
When used as a heating device, the refrigerant absorbs heat from the outside air and returns to the air heat source heat pump 12.

In this embodiment, the air heat source heat pump 12 includes a cold water mode, an ice making mode, a cold / hot water mode,
It is used by selecting one of the ice making / hot water mode and the hot water mode. In the chilled water mode operation, chilled water is generated using AC power, and the generated chilled water is supplied to the chilled water header 30. In the ice making mode operation, ice is generated using AC power, and the generated ice is stored in the heat storage tank 14. In the cold water / hot water mode operation, AC water is used to generate cold water and hot water. The generated cold water is sent to the cold water header 30, and the generated hot water is sent to the hot water header 34. In the ice making / hot water mode operation, ice and hot water are generated using AC power, and the generated ice is stored in the heat storage tank 14.
The generated hot water is supplied to a hot water header 34. Further, in the hot water mode operation, hot water is generated using AC power, and the generated hot water is supplied to the hot water header 34.

The steam sent to the low-pressure steam header 22 is:
Part of it is taken out as steam to meet the steam demand. A part of the remaining steam of the low-pressure steam header 22 is sent to the absorption chiller 8, and the cooling water from the cooling tower 28 is used for cooling the absorption chiller 8.
The water cooled in is supplied to the cold water header 30. The remainder of the steam in the low-pressure steam header 22 is the hot water heat exchanger 16
The hot water generated in the hot water heat exchanger 16 is used to produce hot water, and the generated hot water is sent to the hot water header 34. The hot water supplied to the hot water header 34 is directly taken out as hot water so as to satisfy the hot water demand. Also,
The chilled water fed to the chilled water header 30 is directly taken out as chilled water so as to satisfy the chilled water demand. The energy stored as ice in the heat storage tank 14 is used for producing cold water in the cold water heat exchanger 38, and the cold water is supplied to the cold water header 30.

As described above, in this cooling / heating facility, the combustion gas and the AC power are used as energy sources, and the operating state of the cooling / heating equipment 2, the heating / heating equipment 4 and the steam generation equipment 6 is controlled, so that the entire system is required. Steam demand, hot water demand and cold water demand
It can be taken out in the state of hot water and cold water, respectively.
The control for extracting the steam demand, the hot water demand, and the cold water demand can be performed by, for example, a control system shown in FIG.

A control means 42 is provided for controlling the cooling equipment 2, the heating equipment 4 and the steam generating equipment 6. The control means 42 is composed of, for example, a microcomputer. The control means 42 determines the operating conditions of the cooling / heating device 2, the heating device 4 and the steam generating device 6, and reduces the running cost as described later so as to reduce the running cost. It is determined. In this embodiment, the control means 42
Are operating deriving means 44 for deriving operating conditions, running cost calculating means 46 for calculating running costs under predetermined operating conditions, and energy consumption (driving of fuel gas and AC power) when operating various devices. Energy Consumption Calculation Means 48 for Calculating Energy Consumption
A running cost comparing means 50 for comparing the calculated running cost, a step width changing means 52 for changing the step width of the operating condition when calculating the running cost by changing the operating condition, Demand amount calculation means 53 for calculating each demand amount of hot water and steam is provided.

In connection with the control means 42, an input means 54 comprising, for example, a keyboard, a mouse, etc., is provided. By operating the input means 54, the required amount of cold water, hot water, Demand and steam demand can be set. In connection with the control means 42, a storage means 56 is further provided. The storage unit 56 includes an operation state storage unit 58 that stores the operation states of various devices of the district heating and cooling equipment, an operation condition storage unit 60 that stores the operation conditions of the various devices determined by the control unit 42, 2. Various device data storage means 62 storing data of various devices such as the heating device 4 and the steam generating device 6, for example, rated output, output with the highest efficiency, etc., and a step width when changing operating conditions are stored. And a step width storage unit 64. The driving conditions determined by the driving support system are stored in the driving condition storage means 60 as described later, and the control means 42 is controlled based on the driving pattern stored in the driving condition storage means 60.
Controls the cooling / heating equipment 2, the heating / heating equipment 4 and the generator 6 as required, and by controlling the various equipments 2, 4, 6 in this manner, operation with low running cost can be performed.

Next, the operation of the control means 42 for determining the operating conditions will be described with reference to FIGS. FIG. 3 schematically shows the overall control flow of the driving support system.

Referring to FIGS. 2 and 3, a simulation by the driving support system will be described. The above-described driving support system is configured such that the subsequent operating conditions vary greatly depending on how the heat storage tank 14 in the district heating and cooling equipment is controlled. This means that when the heat storage tank 14 is used, ice is stored in the heat storage tank 14 at night,
By converting the stored ice into cold water during the day, efficient use of the heat storage tank 14 becomes possible.
This is because the usage efficiency of the entire district heating and cooling facility can be increased, and the running cost of the district heating and cooling facility can be reduced. When the heat storage tank 14 is operated or not operated according to the operation state (in other words, when the mode in which the heat storage tank 14 is selectively operated by the input unit 54 is selected), the condition for using the heat storage tank 14 is used. The running cost is compared between the case where the simulation is performed and the case where the heat storage tank 14 is not used, and the smaller one is adopted. In this case, it is determined whether or not to operate the heat storage tank 14 in step S-1.
It is determined whether to simulate the case where the heat storage tank 14 is to be operated or not based on the input or the like, and when the heat storage tank 14 is not operated,
Proceeding to step S-2, a simulation of the operating conditions at this time is performed. On the other hand, when the heat storage tank 14 is operated, the process proceeds to step S-3, and a simulation of the operating conditions at this time is performed.

When the operation of the heat storage tank 14 is not performed, the nighttime operating conditions are determined in step S-2. The cooling water demand, hot water demand, and steam demand required of the district heating and cooling equipment are greatly different between the daytime when human activities are performed and the nighttime when human activities are not much performed. In -2, the determination of the nighttime operating conditions and the calculation of the running cost under these operating conditions are performed. The details of the determination of the operating conditions and the calculation of the running cost will be described later. In addition, the time zone between 10 pm and the next day at 8 am when the demand for cold water, hot water and steam is small is defined as night, and the time zone between 8 am and 10 pm when the demand is large, for example, during the day. It can be.

Next, the process proceeds to step S-4, where daytime operating conditions are determined in consideration of nighttime operating conditions, and running costs are calculated under these operating conditions. The operating conditions in the daytime are determined such that, among the various devices of the cooling / heating device 2, the heating device 4, and the steam generating device 6 at the end of the night, the operating devices are preferentially operated. By setting the operating conditions in the daytime in this way, the equipment to be driven operates all day and night, and efficient and low running cost operation is possible. In addition, this operating condition is determined in step S-2.
Is determined in the same manner as in the nighttime driving conditions.

The nighttime and daytime operating conditions thus determined and the running costs under these operating conditions are stored in the operating condition storage means 60 (step S-).
5) In step S-6, it is determined whether to compare the running cost between when the simulation is performed under the condition using the heat storage tank 14 and when the simulation is performed under the condition not using the heat storage tank 14. As aforementioned,
When the heat storage tank 14 is operated or not operated according to the operation state, the running costs are compared. Therefore, in step S-7, whether or not the simulation when using the heat storage tank 14 was performed was performed. Is determined. And when not simulating,
Proceeding to step S-3, a simulation when using the heat storage tank 14 is performed.

In step S-3, first, the nighttime operating conditions are determined and the running cost under these operating conditions is calculated. When the heat storage tank 14 is operated, ice is generated at night, all of the ice generated during the day is melted, and cold water is generated by using the heat of fusion at the time of melting. Therefore, when operating the heat storage tank 14, the determination of the operating conditions of the heat storage tank 14 and the calculation of the running cost first determine the nighttime operating conditions for generating ice and the like, and determine the daytime operating conditions based on the nighttime operating conditions. It is desirable to determine the operating conditions. The determination of the nighttime operating conditions and the calculation of the running cost will be described later in detail.

Next, the process proceeds to step S-8, and the operation conditions of the heat storage tank 14 are determined preferentially among the daytime operation conditions in consideration of the nighttime operation conditions. The reason for determining the operating conditions of the heat storage tank 14 preferentially in this way is to determine the optimum operating conditions for melting all the ice generated in the heat storage tank 14 in the daytime and returning it to water. When the operating conditions of the heat storage tank 14 are determined, the process proceeds to step S-9, where the operating conditions of other devices except the heat storage tank 14 are determined based on the remaining amounts of cold water, hot water, and steam, and these operating conditions (regions). The running cost is calculated under the operating conditions of the entire cooling and heating equipment). At this time, step S-4
Similarly to the above, the operation conditions in the daytime are such that the operation of the various devices of the cooling device 2, the heating device 4 and the steam generating device 6 at the end of the night is preferentially operated. Is determined, and the operating conditions are determined in step S-
4 is determined in the same manner.

The nighttime and daytime operating conditions thus determined and the running costs under these operating conditions are also stored in the operating condition storage means 60 (step S-1).
0), it is determined whether to compare the running cost between when the simulation is performed under the condition using the heat storage tank 14 and when the simulation is performed under the condition not using the heat storage tank 14. As described above, when the heat storage tank 14 is operated or not operated according to the operation state, the running costs are compared. Therefore, a simulation is performed when the heat storage tank 14 is not used in step S-12. Is determined. When the simulation is not performed, the process proceeds to step S-2, and the simulation when the heat storage tank 14 is not used is performed as described above. That is, the simulation is performed under the condition where the heat storage tank 14 is used and the simulation is performed under the condition where the heat storage tank 14 is not used, and when comparing the simulations, either the case where the heat storage tank 14 is used or the case A simulation is performed from one side, and then a simulation is performed on either side, and both simulations are performed.

When the simulation is performed both when the heat storage tank 14 is used and when it is not used, step S
Proceeding to -13, a comparison between the two simulation results is performed. That is, the running cost comparison means 50 of the control means 42 compares the running cost when the heat storage tank 14 is not used with the running cost when the heat storage tank 14 is used. Conditions are selected, and the selected operation conditions are stored in the operation condition storage means 60 as an operation pattern for controlling the operation of the district heating and cooling equipment, and the control means 42 controls the cooling / heating equipment 2, the heating / heating equipment 4, and the heating equipment 4 based on the operation pattern. The operation of the steam generator 6 is controlled as required. And
By controlling the operation in this way, it is possible to reduce the running cost of the district heating and cooling equipment.

When the heat storage tank 14 is always operated (in other words, when the mode in which the heat storage tank 14 is always operated is selected by the input means 54), only the simulation under the condition using the heat storage tank 14 is performed, and the operation condition is changed. It is determined.
In this case, steps S-1 to S-3, step S-8, step S-9, and step S-10 are performed, whereby the operating conditions for operating the heat storage tank 14 are determined, and The running cost under the operating conditions is calculated, and the process proceeds from step S-11 to step S-14. As the optimum condition, the condition when the heat storage tank 14 is used is adopted.

Further, when the heat storage tank 14 is not always operated (in other words, the mode in which the heat storage tank 14 is not always operated is selected by the input means 54), only the simulation under the condition where the heat storage tank 14 is not used is performed to determine the operation condition. Is done. In this case, steps S-1 to S-2,
Steps S-4 and S-5 are performed, whereby the operating conditions when the heat storage tank 14 is not operated are determined, and the running cost under the operating conditions is calculated. Step S-7 to step S-14
The conditions when the heat storage tank 14 is not used are adopted as the optimal conditions.

Next, referring to FIG. 4, step S-3.
The determination of the operating conditions at night and the calculation of the running cost will be described. When determining the nighttime operating conditions, first, in step S3-1, a peak time at which the total demand of chilled water, hot water and steam reaches a peak throughout the nighttime zone is searched, and the chilled water demand during this peak time is searched. , Hot water demand and steam demand. The operating status storage means 58 stores the daily operating status of the district heating and cooling equipment, that is, the cold water demand, the hot water demand, and the steam demand in each time zone of the day. The peak time during the night is searched based on the demand amount thus obtained, and the respective demand amounts of cold water, hot water and steam in that time zone are obtained. In this embodiment, the driving situation at each time of day is stored,
Although the operation of various devices is controlled in units of one hour, the present invention is not limited to this. For example, the operation status is stored every two hours (or half an hour), and the various devices are controlled in units of two hours (or half an hour). Can be controlled. Further, in this embodiment, the respective demands of the cold water, hot water and steam at night are obtained based on the operation status stored in the operation status storage means 58. Each demand amount of hot water and steam may be inputted by the input means 54, and the operating condition may be derived based on the inputted demand amount.

Next, in step S3-2, operating conditions for satisfying the cold water demand, the hot water demand, and the steam demand during the peak hours at night are obtained. In step S3-2, the operation derivation unit 4 of the control unit 42
4 determines the equipment to be operated in order to satisfy the above-mentioned demand, and obtains the operating conditions of the equipment to be operated at a uniform load factor (a method for equalizing the load factors of all the operated equipment). The determination of the operating conditions based on the equal load factor will be described later in detail with reference to FIGS.
When the operating conditions of the night peak time are obtained in this way, the process proceeds to step S3-3, where the running cost and the energy consumption under the operating conditions determined by the equal load factor are calculated, and the calculated running cost and energy consumption are calculated. It is stored in the operating condition storage means 60. The calculation of the running cost under the determined operating conditions is performed by the running cost calculating means 46, and the calculation of the energy consumption under the determined operating conditions is performed by the energy consumption calculating means 46.

Thereafter, in step S3-4, the optimum operating conditions and running costs are obtained by changing some of the operating conditions determined in step S3-3. The determination of the corrected operating conditions is obtained by adjusting the load factors of various devices used under the determined operating conditions. The determination of the optimum operating condition and the calculation of the running cost under the condition will be described in detail with reference to FIGS.

When the optimum operating conditions and the running costs under the conditions are determined in step S3-4, these operating conditions and running costs are stored in the operating condition storage means 60, and thereafter, the process proceeds to step S3-6, and the nighttime operation is performed. The operating conditions and running costs in other time zones during the night are determined based on the optimal operating conditions during the peak hours. The operating conditions at this time are basically such that when the demand for cold water, hot water and steam decreases, the load factor set under the optimal operating conditions does not fluctuate, but unnecessary It is determined to stop the operation of the object, and by determining the operating conditions in this way, the necessary equipment is constantly operated, and the operation can be performed efficiently and at low running cost. In this way, the optimum operating conditions in all the night time zones and the running costs under the operating conditions are obtained. The daytime operating conditions in step S-4 and step S-8 are obtained in the same manner as described above.

Next, referring to FIG. 5, step S3--
The derivation of the operating conditions based on the equal load factor in 2 will be described. In order to derive the operating conditions of various devices based on the equal load factor, first, in step S32-1, it is determined whether to prioritize a gas system (fuel gas) as energy consumption. Step S32-
Proceed to 2. On the other hand, when the priority is not given to the gas system, step S
The process proceeds to 32-3, where it is determined whether to give priority to the power system (AC power).
Proceed to 4.

When the process proceeds from step S32-1 to S32-2 with priority given to the gas system, the operating conditions of various devices when the gas system is prioritized are derived, and the running cost under these operating conditions is calculated. The derivation of the operating conditions is performed by the driving deriving means 44, and the calculation of the running cost is performed by the running cost calculating means 46. The determination of the operating conditions and the calculation of the running cost will be described later with reference to FIG.

After the derivation of the operating conditions and the calculation of the running cost are performed in step S32-2, the derived operating conditions and the calculated running cost are stored in the operating condition storage means 60 (step S32-5).
This requires the operating conditions and running costs of various devices when giving priority to the gas system. Thereafter, the process proceeds to step S32-6, in which it is determined whether or not a simulation giving priority to the power system (AC power) has been performed. If the simulation has not been performed, the process proceeds to step S32-4.

When the power system is prioritized and the process proceeds from step S32-3 to step S32-4, or when the power system is not simulated and the process proceeds from step S32-6 to step S32-4, the power system is prioritized. Derivation of operating conditions of various devices and calculation of running costs under the conditions are performed. The derivation of the operating conditions and the calculation of the running cost are performed in the same manner as in step S32-2.

After the derivation of the operating condition and the calculation of the running cost are performed in step S32-4, the derived operating condition and the calculated running cost are stored in the operating condition storage means 60 (step S32-7).
As a result, operating conditions and running costs of various devices when giving priority to the power system are obtained. Thereafter, the process proceeds to step S32-8, where it is determined whether or not a simulation that prioritizes the gas system has been performed. If the simulation has not been performed, the process returns to step S32-2, and the simulation that prioritizes the gas system is performed as described above. Done.

After the simulation of both the gas system and the power system has been performed, the process proceeds to step S32-9, where the running cost comparison means 50 determines the running cost with priority given to the gas system obtained in step S32-2, The power system obtained in S32-4 is prioritized, the running cost is compared with the running cost, the operating condition with the smaller running cost is selected as the operating condition of the equal load, and this operating condition and the running cost under this condition are equalized. The operating condition is stored in the operating condition storage means 60 as the operating condition. By selecting operating conditions in this way,
It is possible to perform operation control in consideration of which of the gas system and the electric power system is to be prioritized for operation control, and it is possible to reduce running cost.

Next, referring to FIG. 6, step S32
The derivation of the operating conditions and the calculation of the running cost in -2 (or step S32-4) will be described.
When determining the operating conditions, first, in step S322-1, the cooling / heating device 2 to be operated is selected. Operation derivation means 4
4 selects the refrigeration equipment 2 to be operated based on the chilled water demand, that is, determines the equipment to be operated and the number of the absorption chiller 8, the centrifugal chiller 10, the air heat source heat pump 12, and the heat storage tank 14 to be operated. For the selection of the cooling / heating device 2, for example, priorities to be used for the various devices 8, 10, 12, and 14 to be used can be provided, and the devices can be selected according to the set priorities. In this way, first, the operating conditions of the cooling / heating equipment 2 are determined. Then, the process proceeds to step S322-2, and the energy consumption of the cooling and heating device 2 is calculated. This consumed energy is calculated by the consumed energy calculating means 48, and the calculated consumed energy is stored in the operating condition storage means 60.

Next, in step S322-3, the amount of hot water generated when the air heat source heat pump 12 is operated as the cold device 2 is subtracted from the hot water demand, and the hot water required for the hot device 4 other than the heat pump 12 is subtracted. Demand is required. Then, in step S322-4, the hot water equipment 4 to be operated is selected. The operation deriving means 44 selects the hot water equipment 2 based on the remaining hot water demand, that is, determines the number of operating hot water heat exchangers 16, and thus the operating conditions of the hot water equipment 4 are determined. Then, step S3
Proceeding to 22-5, the energy consumption of the heating device 4 is calculated, and the calculated energy consumption is stored in the operating condition storage means 60.

Next, the process proceeds to step S322-6, and the steam generator 6 to be operated is selected. Operation derivation means 44
Selects the steam generating device 6 based on the steam demand, that is, determines the operating devices and the number of the co-generation 18 and the low-pressure boiler 20 of the gas turbine or the gas engine. In the selection of the steam generating device 6, for example, priorities to be used for the various devices 18 and 20 to be used can be provided, and the devices can be selected according to the set priorities. In this way, the operating conditions of the steam generator 6 are finally determined. Then, the process proceeds to step S322-7, where the energy consumption of the steam generator 6 is calculated, and the obtained energy consumption is stored in the operating condition storage unit 60. When the operating conditions are determined, as described above, the operating conditions of the entire district heating / cooling facility can be easily determined by first determining the cooling / heating equipment 2 and then determining the heating / heating equipment 4 and then determining the steam generating equipment 6. Can be determined.

When the operating conditions of the various devices 2, 4, and 6 are derived in this way, the running costs of all the devices to be operated are calculated in step S322-8. The calculation of the running cost is performed based on the operating conditions of the various devices stored in the operating condition storage unit 60 and the energy consumption under those conditions. Then, the obtained running cost is stored in the operating condition storage means 60 together with the derived operating condition as the basic operating condition of the equal load factor.

After such basic operating conditions have been derived, the process proceeds to step S322-10, in which the cooling equipment 2
It is determined whether or not simulation has been performed by replacing some of the devices. If this simulation has not been performed, the process proceeds from step S322-10 to step S322-11, where a part of the cooling / heating device 2 is replaced, and thereafter returns to step S322-2, whereupon step S322-2 to step S322- 10 is performed as described above. Partial replacement of the cooling / heating equipment 2 is performed between a high-priority equipment not selected in step S322-1 and the lowest priority equipment among the selected equipments. Operating conditions of various devices when a part of the device 2 is replaced and running costs under the conditions are determined.
The obtained operating conditions and running costs are stored in the operating condition storage means 60 as when the part of the cooling / heating equipment 2 was replaced.

If it is determined in step S322-10 that a simulation has been performed in which some of the cooling / heating devices 2 have been replaced, the process proceeds from step S322-10 to step S32.
Proceeding to 2-12, it is determined whether or not a simulation has been performed by replacing some of the heating devices 4. If this simulation has not been performed, the process proceeds from step S322-12 to step S322-13, where some of the heating devices 4 are exchanged, and thereafter returns to step S322-2, whereupon steps S322-2 to S322- are performed. 10 is performed as described above. Partial replacement of the heating device 4 is also performed in the same manner as described above, and the operating conditions of the various devices and the running cost under those conditions when the part of the heating device 4 is replaced as described above are obtained. The running cost is stored in the operating condition storage unit 60 as when the heating device 4 was partially replaced.

If it is determined in step S322-12 that a simulation has been performed in which some of the heating devices 4 have been replaced, the process proceeds from step S322-12 to step S32.
Proceeding to 2-14, it is determined whether or not simulation has been performed by replacing some of the steam generators 6. If this simulation has not been performed, step S322-14
The process proceeds from step S322-15 to step S322-15, where a part of the steam generator 6 is replaced.
2 and return to step S322-2 to step S322.
10 is performed as described above. Partial replacement of the steam generating device 6 is also performed in the same manner as described above, and the operating conditions of various devices and the running cost under those conditions when the part of the steam generating device 6 is replaced as described above are obtained. The operating condition and the running cost are stored in the operating condition storage unit 60 as when a part of the steam generator 6 was replaced.

If it is determined in step S322-14 that a simulation in which some of the steam generators 6 have been replaced has been performed, the process proceeds to step S322-14.
From step S322-16, the running cost comparison unit 50 determines the various running costs stored in the operation condition storage unit 60 (basic operating conditions, operating conditions when a part of the cooling / heating equipment 2 is replaced, and heating / heating equipment 4). And the running cost under the operating conditions when replacing some of the devices of the steam generating device 6) and selecting the smallest running cost.
The operation deriving unit 44 selects the operating condition at which the running cost can be obtained as the operating condition at the equal load factor, and the obtained operating condition and the running cost are stored in the operating condition storage unit 60. In this way, the operating conditions of the cooling device 2, the heating device 4, and the steam generating device 6 based on the uniform load factor are derived, and the running cost under the condition is calculated.

In the above-described embodiment, after deriving the basic operating conditions, a simulation in which some devices of the cooling and heating device 2 were replaced based on the basic operating conditions and a device in which the heating and heating device 4 were partially replaced were performed. The simulation and the simulation in which a part of the steam generating device 6 is replaced are performed. Instead of this, the operating condition of the cooling device 2 is derived, and then the cooling device 2 is deduced from the operating condition. A simulation in which a part of the equipment is replaced may be performed, and the operating condition with low energy consumption may be determined as the operating condition of the cooling / heating equipment 2. In addition, for the heating equipment 4 as well, after the operating conditions of the cooling equipment 2 are determined as described above, the heating equipment 4 is determined based on the determined operating conditions.
And then a simulation is performed by replacing some of the heating devices 4 based on the operating conditions, and the operating conditions with low energy consumption can be determined as the operating conditions of the cooling device 2 and the heating device 4. . further,
As for the steam generating device 6, the operating conditions of the cooling device 2 and the heating device 4 are determined as described above, and then the operating conditions of the steam generating device 6 are determined based on the determined operating conditions. Steam generating equipment 6 based on operating conditions
By performing a simulation in which some of the devices are replaced, the operating conditions with low energy consumption can be determined as the operating conditions of the cooling device 2, the heating device 4, and the steam generating device 6. In this way, the operating conditions and the running costs of the cooling / heating device 2, the heating device 4, and the steam generating device 6 based on the uniform load factor may be obtained.

Next, with reference to FIG. 7 and FIG. 8, the derivation of the optimum operating condition performed in step S3-4 and the calculation of the running cost under this condition will be described. In this embodiment, as shown in FIG. 7, when obtaining the optimum operating conditions of the district heating and cooling equipment, first, in step S34-1, the optimum load factor for the equipment operated by the cooling and heating equipment 2 is derived. Step S3
At 4-2, the optimum load factor for the device operated by the heating device 4 is derived. Then, at step S34-3, the optimum load factor for the device operated by the bin cogeneration 18 of the gaster or gas engine is calculated. The derivation is performed, and thereafter, in step S34-4, the low-pressure boiler 20
Of the optimal load factor for the vehicle that is driven. Then, an optimum load factor is obtained for the equipment operated by the district heating and cooling equipment in this way, and by operating at the obtained optimum load factor, the running cost can be reduced.

Next, referring to FIG. 8, step S34
The derivation of the optimal load factor of the cooling and heating equipment 2 performed in -1, that is, the derivation of the optimal operating conditions will be described. The derivation of the optimum load factor of the thermal equipment 4 in step S34-2, the derivation of the optimum load factor of the cogeneration 18 of the gas turbine or the gas engine in step S34-3, and the optimum load factor of the low-pressure boiler 20 in step S34-4. Is also performed in substantially the same manner as in step S34-1.

When deriving the optimum load factor of the cooling / heating device 2, first, in step S341-1, the device having the maximum rated output is selected from the devices to be operated. The rated outputs of the various devices are stored in various device data storage means 62. Based on the data stored in the data storage means 62, the operation deriving means 44 determines the rated output Choose the largest one. Next, proceeding to step S341-2, the operation deriving unit 44 sets the load factor of the device selected in step S341-1 to the most efficient load factor. Since the operation control with the largest rated output has the greatest effect on the running cost of the entire refrigeration equipment 2, the load factor for this equipment is set to the most efficient load factor. The most efficient load factor is also stored in the data storage means 62 for various devices, and is set by reading from the data stored in the data storage means 62. Then, step S3
At 41-3, the operation deriving means 44 obtains the output of the other devices operated by the cooling and heating device 2 at an equal load factor, and in this manner, the modified basic operating condition of the cooling and heating device 2 is derived, and step S341 is performed. At -4, the energy consumption due to the derived modified basic operating conditions is calculated. The calculation of the consumed energy is performed by the consumed energy calculating means 48.

When the modified basic operating conditions of the cooling and heating equipment 2 are derived, the process proceeds to step S341-5, and based on the modified basic operating conditions, the operation deriving means 44 controls the heating and heating equipment 4 and the steam generating equipment 6 to operate. The load factors are determined by the uniform load factors, and the determined load factors are derived as the modified operating conditions of the heating device 4 and the steam generating device 6. Thus, the cooling / heating equipment 2, the heating / heating equipment 4, and the steam generating equipment 6
Are calculated, and in step S341-6, the running cost is calculated based on the corrected operating conditions.

After the running cost is calculated, the process proceeds to step S341-7, in which the running cost is reduced, that is, the running cost based on the operating condition based on the uniform load factor (the running cost obtained in step S3-3). It is determined whether the running cost (running cost in step S341-6) based on the corrected operation condition is smaller than the corrected operating condition. If the running cost based on the corrected operating condition is smaller, the process proceeds to step S341-8, where the corrected operating condition and the running cost under this condition are stored in the operating condition storage unit 60, and the operating condition and the running cost are updated. Will be On the other hand, if the running cost based on the corrected operating condition is larger, the process proceeds to step S341-9, where the corrected operating condition and the running cost under this condition are not stored in the operating condition storage unit 60, and the previous operating condition and running cost are not stored. Will be maintained.

Steps S341-8 to S34
When the process proceeds to step S341-10 from step S341-9 or from step S341-9, the most efficient output of the device (the rated output is the largest) selected by the cooling / heating device 2 is determined by a predetermined step width, for example, 20 units. It is changed by%. For example, when the most efficient output is 80%, the operation derivation means 44 sets the output width of 100% of + 20% and the output of 60% of -20% as the step width.
The step width is stored in the step width storing means 64, and the step width value 20 stored in the step width storing means 64 is stored.
% Is read. Then, step SS341-3 is performed.
The operation conditions of the cooling / heating equipment 2, the heating / heating equipment 4 and the steam generating equipment 6 at the time of changing the step width in the same manner as in Step S341-5 are derived, and Step S341-11 is performed.
The running cost under the changed operating conditions is calculated, and the process proceeds to step 341-12.

In step S341-12, it is determined whether the running cost has become small,
0 (step S34)
It is determined whether the running cost (the running cost in step S341-11) based on the operating condition when the step size is changed is smaller than the running cost determined to be small in 1-7. If the running cost based on the changed operating condition is smaller, the process proceeds to step S341-13, and the changed operating condition and the running cost under this condition are stored in the operating condition storage means 60, and the operating condition and the running cost are stored. Is updated. On the other hand, if the running cost according to the changed operating condition is larger, the process proceeds to step S341-14, and the changed operating condition and the running cost of this condition are not stored in the operating condition storage unit 60, and the previous operating condition is not stored. And the running cost is maintained.

Next, the process proceeds to step S341-15,
The most efficient output of the device selected at the cooling / heating device 2 (the one having the largest rated output) is changed by a step width that is half the predetermined step width, for example, 10%. For example, when the most efficient output is 80%, the operation deriving means 44 sets an output of 90% of + 10% and an output of 70% of -10% as half step widths.
The half step width of the predetermined step width is obtained by reducing the step width value 20% read from the step width storage unit 64 to half by the step width changing unit 52.
Then, Steps SS341-3 to S34
In the same manner as in 1-5, the operating conditions of the cooling / heating device 2, the heating device 4, and the steam generating device 6 when the step size is changed by the half step width of the predetermined step width are derived, and step S341-
The running cost under the changed operating conditions is calculated in step 16, and the process proceeds to step 341-17.

In step S341-17, it is determined whether the running cost has become small,
0 (step S34)
The running cost (step S34) according to the operating condition when the step width is changed by half the predetermined step width than the running cost determined to be smaller in 1-12).
It is determined whether the running cost (1-16) is smaller. Then, if the running cost under the operating condition of the half step width is smaller, the process proceeds to step S34.
Proceeding to 1-18, the operating condition at this time and the running cost of this condition are stored in the operating condition storage means 60,
The operating conditions and running costs are updated. On the other hand, if the running cost according to the operating condition at this time is larger, the process proceeds to step S341-19, and the changed operating condition and the running cost under this condition are not stored in the operating condition storage unit 60, and the previous operating condition and Running costs are maintained.

In this way, the optimum operating conditions of the equipment operated by the cooling / heating equipment 2 and the running cost under these conditions are obtained. Similarly, optimum operating conditions of the heating device 4 and the steam generating device 6 are obtained.

In the above embodiment, the step width is set to 20%
However, this width can be appropriately set, for example, to 15%, 10%, or the like. In addition, the simulation is performed by changing the step width to half the step width of the predetermined step width.
It is also possible to obtain a more appropriate operating condition by simulating up to a step width of 4 and further down to a step width of 1/8 of the predetermined step width. Although described as a form having a cooling device, a heating device and an evaporating device,
The present invention may be applied to a facility including at least a cooling device and a heating device. Moreover, you may implement in the equipment which does not have the heat storage tank 14.

Although the embodiment of the operation support system for district heating and cooling equipment according to the present invention has been described above, the present invention is not limited to such an embodiment, and various modifications can be made without departing from the scope of the present invention. , Modifications are possible.

[0065]

According to the driving support system of the first aspect of the present invention, the operating condition deriving means includes a cooling / heating device for satisfying the steam demand, the hot water demand, and the cold water demand required for the district cooling / heating equipment. The operating conditions of the heating equipment and the steam generating equipment are determined, and the operating conditions are determined so that the running costs of all the equipment are reduced. Therefore,
By controlling the operation of various devices based on the operating conditions determined by the operating condition deriving means, the running cost of the cooling and heating equipment can be reduced, and the running cost-saving operation can be performed.

According to the present invention, when deciding the control of the system, the difficulty of operation and control of each device is taken into consideration,
First, the operating conditions for the cooling equipment are determined based on the demand for cold water, the operating conditions for the heating equipment are determined based on the demand for hot water, and then the operating conditions for the steam generating equipment are determined based on the demand for steam. Various devices can be easily controlled. In addition, the operating conditions are determined not in the whole system at the same time but in the order of the cooling equipment, the heating equipment, and the steam generating equipment, so that the operating conditions can be determined relatively easily. In particular, according to the present invention, the amount of hot water generated by operating the cooling equipment is used as an element for determining the operating conditions of the heating equipment, and thus the order of the operating conditions is significant.

Further, according to the driving support system of the second aspect of the present invention, the operating condition of the refrigeration equipment is determined by first considering whether to use the heat storage tank included in the refrigeration equipment. When a heat storage tank is used, in order to efficiently use the heat storage tank and reduce its running cost, ice is stored in the heat storage tank at night, for example, and all the stored ice is used during the day, for example, converted into cold water. It is desirable to do. Therefore, when using the heat storage tank, the running cost of the cooling equipment can be reduced by determining the control of the heat storage tank with the highest priority and then determining the operating conditions of the remaining cooling equipment.

[Brief description of the drawings]

FIG. 1 is a system diagram schematically showing an embodiment of a driving support system for a district heating / cooling facility according to the present invention.

FIG. 2 is a block diagram schematically showing a control system of the driving support system of FIG.

FIG. 3 is a flowchart showing an outline of selection of an optimum driving condition by a control system of the driving support system of FIG. 2;

FIG. 4 is a step S-3 in the flowchart of FIG. 3;
It is a flowchart which shows the flow of.

FIG. 5 is a step S3- in the flowchart of FIG. 4;
3 is a flowchart showing the flow of Step 2 in detail.

FIG. 6 is a step S32 in the flowchart of FIG. 5;
3 is a flowchart illustrating the flow of -2 in more detail.

FIG. 7 is a flowchart illustrating step S3- in the flowchart of FIG. 4;
4 is a flowchart illustrating a flow of No. 4;

FIG. 8 is a step S34 in the flowchart of FIG. 7;
6 is a flowchart showing the flow of -1 in detail.

[Explanation of symbols]

 Reference Signs List 2 cooling / heating equipment 4 heating / heating equipment 6 steam generating equipment 42 control means 44 operation derivation means 46 running cost calculation means 48 energy consumption calculation means 50 running cost comparison means 52 step width change means 54 input means 56 storage means 58 operation status storage means 60 operation Condition storage means 64 Step width storage means

(56) References JP-A-3-291439 (JP, A) JP-A-5-164377 (JP, A) JP-A-8-86492 (JP, A) (58) Fields investigated (Int) .Cl. ⁷ , DB name) F24F 11/02 F24F 11/02 102 F24F 5/00 102 F25B 29/00 431

Claims (2)

(57) [Claims] 1. Operation support in a district heating / cooling facility including at least a cooling device and a heating device among a cooling device for generating cold water, a heating device for generating hot water, and a steam generating device for generating steam. In the system, an operation derivation unit for determining an operation condition of each device based on a demand amount of a heat medium generated by each device and a demand amount of chilled water, and an operation condition set by the operation derivation unit are stored. Operating condition storage means for the, the operation deriving means determines at least the operating condition of the cooling equipment, then the amount of hot water generated by operating the cooling equipment, as an element of the operating condition determination of the heating equipment The operating condition of the heating device is determined by using the operating condition, and the operating condition is determined so that the running cost of each device is reduced. Driving support system in air conditioning and heating facilities. 2. The cooling device has a heat storage tank for generating ice and storing heat, and the operation deriving means first uses the heat storage tank when determining operating conditions of the cooling device. In consideration of the above, when using the heat storage tank, the operation derivation means determines the operating conditions of the heat storage tank, and then determines the operating conditions of the remaining equipment other than the heat storage tank. The driving support system in the district heating and cooling equipment according to claim 1, wherein