JP2003207204A - Regional hot water supply system and accounting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a regional hot water supply system capable of improving the energy efficiency in electric-power facilities, and increasing the operational merit. <P>SOLUTION: This system comprises a hot water generator 109 for generating the hot water by utilizing the heat discharged from a micro gas turbine power generator 101 generating an electric power of several tens of kW to several hundreds of kW, and a hot water supply pipe 111 mounted from the hot water generator 109 to a hot water user 110 for supplying the hot water generated by the hot water generator 109 to the hot water user 110. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention utilizes heat emitted from a small-scale power generation facility such as a micro gas turbine generator or a small fuel cell that generates electric power of several tens to several hundreds kW for hot water generation. However, the present invention relates to a regional hot water supply system and a billing method which are effective in improving the energy efficiency of a small-scale cogeneration system by supplying hot water to users in a nearby area.

[0002]

2. Description of the Related Art A conventional cogeneration system utilizes waste heat generated in a large-scale power generation facility of thousands to tens of thousands of kW and supplies hot water and cold water together with electric power generated to a nearby office building or hotel. By 80
The energy efficiency is as high as%.

Particularly in recent years, even in small and medium-sized businesses such as supermarkets, family restaurants, and multi-family houses, electricity charges are low, so a micro gas turbine generator with a power generation capacity of about several tens to several hundreds kW on the premises. There are an increasing number of cases where electric power and hot water are installed by installing a small fuel cell or the like. However, when there is not much demand for hot water, it is often the case that exhaust heat cannot be fully utilized and the heat is wasted to the outside using a cooling tower or the like.

In addition, although there are cases where waste heat is supplied (sold) to other users as hot water, the target is a large-scale consumer such as a hotel, and a small-scale hot water supply business using a small power generation facility. Was not done.

[0005]

In the conventional method, since the small-scale enterprises with little demand for hot water cannot fully utilize the exhaust heat, there is a problem that the energy efficiency is reduced to about 50% and the operation merit is reduced. Was.

The hot water supply method also employs a method in which a heat exchanger is installed on the side of the hot water user and tap water is heated through the heat exchanger to obtain hot water. In addition to the need for a water supply pipe that circulates the water after heat exchange to the power generation equipment and the like, heat loss also occurs in the heat exchanger, which causes a problem of high cost and low efficiency for hot water users.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a district hot water supply system and a charging method for improving the energy efficiency of power generation equipment and increasing the operational merit.

[0008]

In order to achieve the above object, a district hot water supply system of the present invention comprises a hot water generator for generating hot water by utilizing heat discharged from a small-scale power generation facility, and the hot water generation. The hot water supply pipe is connected from the water heater to the hot water user and supplies the hot water generated by the hot water generator to the hot water user.

Further, according to the present invention, in the district hot water supply system, as a small-scale power generation facility, several tens of kW to several hundreds of kW are supplied.
It is characterized by using a micro gas turbine generator or a fuel cell or the like that generates W electric power.

Further, the present invention is characterized in that, in the district hot water supply system, a hot water generator for heating tap water to generate hot water is used as the hot water generator.

Further, the present invention is characterized in that, in the district hot water supply system, the hot water generator is provided with a heat dissipation facility for performing a heat dissipation operation according to a decrease in the demand for hot water.

Further, the present invention is characterized in that, in the district hot water supply system, a function of an electric water heater capable of electrically generating hot water is added to the hot water generator.

The present invention further provides, in the district hot water supply system, a raw water thermometer for measuring the temperature of raw water introduced into the hot water generator, and a hot water thermometer for measuring the temperature of hot water supplied to a hot water user, A hot water flow meter for measuring the flow rate of hot water is provided.

According to the present invention, in the district hot water supply system, the hot water flow meter detects the start of the hot water flow and starts measuring the hot water flow meter and the hot water thermometer, and the hot water flow meter detects the stop of the hot water flow. It is characterized in that the measurement of the hot water flow meter and the hot water thermometer is stopped.

According to the present invention, in the district hot water supply system, the raw water thermometer stores the measurement data of the raw water temperature measured every predetermined time in a memory, and the hot water thermometer measures the hot water temperature every predetermined time. The measured data is stored in the memory, and the measured data of the hot water flow meter sequentially measuring the hot water flow rate for a predetermined time is stored in the memory.

Further, in the above-described district hot water supply system, the present invention is a remote monitoring center connected to a raw water thermometer, a hot water thermometer, and a hot water flow meter by a communication line, by which the accumulated data of the raw water thermometer and the accumulation of the hot water thermometer are stored. It is characterized in that the data and the accumulated data of the hot water flow meter are read.

Further, in the above district hot water supply system according to the present invention, the accumulated data of the raw water thermometer and the accumulated data of the warm water thermometer are stored by the portable dedicated terminal connected to the raw water thermometer, the warm water thermometer and the warm water flow meter. And reading the accumulated data of the hot water flow meter.

According to the present invention, in the district hot water supply system, the remote monitoring center calculates a temperature rise value of a temperature difference between the raw water temperature and the hot water temperature from the data of the raw water thermometer and the data of the hot water thermometer to calculate a hot water flow rate. The heat energy supply amount is calculated by multiplying the hot water flow rate obtained from the meter data by the temperature rise value.

Further, according to the present invention, in a billing method for a regional hot water supply system for heating raw water by a hot water generator to generate hot water and supplying the hot water to users, the temperature of the raw water introduced into the hot water generator is measured by a raw water thermometer. Measure the temperature of the hot water supplied to the hot water user with the hot water thermometer, and measure the flow rate of the hot water with the hot water flow meter to calculate the temperature rise value of the temperature difference between the raw water temperature and the hot water temperature. It is characterized in that the heat energy supply amount is calculated by multiplying the temperature rise value, and the hot water usage fee based on the heat energy supply amount is charged.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is an explanatory diagram showing the configuration of an embodiment of the present invention, which is several tens to several hundreds of kW as a small-scale power generation facility.
A case of a supermarket where a micro gas turbine generator that generates electric power of W is installed is shown, and an example is shown in which hot water is supplied to stores (barber shops, etc.), detached houses, apartments, etc. in the neighboring area. There is.

A gas pipe 102, a water pipe 103, and a power line 117 for power reception are introduced into a power generator 101 installed in a supermarket, and the power generation unit 10 is provided in the power generator 101.
7 and a hot water generator 109 including an electric heater 108 are installed. A heat dissipation facility 115 is provided in the power generation unit 107 of the hot water generator 109. The gas pipe 102 is the hot water generator 10.
9, the power receiving line 117 is connected to the electric heater 108 of the hot water generator 109, and the water pipe 103 is connected to the hot water generator 1 via the measuring unit 104.
09 is connected to the hot water generator. A raw water thermometer and a raw water flow meter are installed in the measurement unit 104, and are connected via a communication line 105 to a remote monitoring center 106 composed of a personal computer or the like. The raw water thermometer in the measurement unit 104 stores the measurement data obtained by measuring the temperature of the raw water (tap water) at predetermined intervals in a memory, and the measurement unit 10
The raw water flow meter in 4 stores the measurement data of the raw water flow rate for a predetermined time in a memory. A hot water supply pipe 111 is connected to the hot water generating unit of the hot water generator 109, and the hot water supply pipe 111 is branched into a plurality of hot water supply pipes 111 by a hot water branch valve 116, and the plurality of branched hot water supply pipes 111 respectively correspond to measurement units. It is connected to a hot water user 110 such as a barber shop, a detached house, an apartment house, etc. in the neighborhood through 114.

The measuring unit 114 installed at the hot water receiving port of the hot water user 110 comprises a hot water thermometer 112 and a hot water flow meter 113, and is connected to the remote monitoring center 106 via the communication line 105. The hot water thermometer 112 in the measurement unit 114 accumulates the measurement data of the hot water temperature measured at a predetermined time in a memory, and the hot water flow meter 113 in the measurement unit 114 stores the measurement data of the measured hot water flow in a predetermined time in the memory. Accumulate in.

The generator 101 burns gas to generate electricity, and the hot water generator 109 heats raw water (tap water) by exhaust heat to generate hot water. The electric power and hot water obtained from the generator 101 are consumed at home, but when the hot water supply exceeds the consumption, the hot water is supplied to hot water users 110 such as barber shops, single-family houses, and apartments in the neighborhood. To do.

At night, the electric power consumption decreases while the supermarket in which the private generator 101 is installed is closed. Therefore, the night electricity charge of commercial power is cheaper than the electric power supplied by the private generator 101. From
In many cases, the operation of the private power generator 101 is stopped and the commercial power of the electric power company is purchased, but in this case, hot water cannot be generated using the power generation unit 107 as a heat source, and therefore the power receiving power line 117 is used.
The hot water generator 109 is used as an electric water heater to generate hot water using the commercial electric power supplied from the commercial electric power, and the hot water is constantly supplied to hot water users 110 such as shops in a neighboring area such as a barber shop, a single-family house, and an apartment house. Is possible.

On the contrary, the measuring unit 10 on the generator 101 side
When a decrease in hot water demand is detected by the raw water flow meter in 4, it is determined that the hot water supply is excessive, and heat is dissipated by the heat dissipating equipment 115 attached to the generator 101. If the hot water demand is restored, heat dissipating by the heat dissipating equipment 115 is performed. Supply and demand balance in terms of thermal energy will be achieved by stopping the.

The raw water thermometer in the measuring unit 104 on the side of the generator 101 measures the raw water temperature at regular time intervals, for example, every 30 seconds, and stores the measured data in a memory inside the raw water thermometer.

On the other hand, when the hot water user 110 starts to use hot water, the hot water flow meter 113 in the measuring unit 114 is used.
Detects the start of the flow of hot water, and starts measurement together with the hot water thermometer 112 in the measurement unit 114. The hot water thermometer 112 measures the hot water temperature at regular time intervals, for example, every 30 seconds, and stores the measurement data in a memory inside the hot water thermometer 112. The warm water flow meter 113 sequentially measures a warm water flow rate (amount of warm water used) that has flowed for a certain period of time, for example, 30 seconds, and stores the measured data in a memory inside the warm water flow meter 113. When the hot water user 110 stops using the hot water, the hot water flow meter 113 detects the stop of the hot water flow, and both the hot water thermometer 112 and the hot water flow meter 113 stop the measurement.

The remote monitoring center 106 communicates the accumulated data from the raw water thermometer of the measuring unit 104 of the generator 101 and the hot water thermometer 112 and the hot water flow meter 113 in the measuring unit 114 of the hot water user 110 side at regular intervals through a communication line. 1
05 or read with the measuring unit 104
The accumulated data of the hot water thermometer 112 and the hot water flow meter 113 in the raw water thermometer and the measuring unit 114 of the above are used by using a portable dedicated terminal connected to the raw water thermometer, the hot water thermometer 112 and the hot water flow meter 113. The meter reader manually reads the data and processes the data at the remote monitoring center 106.

At the remote monitoring center 106, the temperature rise value of the temperature difference between the raw water temperature and the hot water temperature is obtained by comparing the raw water temperature and the hot water temperature every 30 seconds, for example, and the temperature rise value is heated for 30 seconds. Multiply the flow rate to calculate the amount of heat energy supplied by hot water for each hot water user 110, and charge the hot water user 110 as a hot water usage fee at a rate commensurate with the heat energy supply amount together with the water and sewage rate, and collect the collected amount. , Give back to the business operator of the supermarket where the generator 101 is installed.

As the small-scale power generation facility, a small fuel cell or the like that generates electric power of several tens to several hundreds of kW may be used, and it can be carried out in the same manner as the above-mentioned embodiment.

As described above, the energy efficiency of the small-scale cogeneration system is improved, and the hot water user charges the hot water usage fee and the water and sewerage charge based on the amount of heat energy used, and collects the charges to generate the power generation facility. To improve operational merits such as.

[0033]

As described above, according to the present invention, even when the demand for exhaust heat generated from a small power generation facility is small, it is possible to supply heat in the form of hot water to stores, houses, etc. in the neighboring area. It is possible to improve the energy efficiency of the power generation equipment and increase the operational merit.

[Brief description of drawings]

FIG. 1 is a configuration explanatory view showing an embodiment of the present invention.

[Explanation of symbols]

101 ... Generator (micro gas turbine generator) 102 ... Gas pipe 103 ... Water pipe 104 ... Measurement unit (raw water thermometer and raw water flowmeter built-in) 105 ... Communication line 106 ... Remote monitoring center 107 ... Power generator 108 ... Electric heater 109 ... Hot water generator 110 ... Hot water user 111 in a nearby store or house 111 ... Hot water pipe 112 ... Hot water thermometer 113 ... Hot water flow meter 114 ... Measuring unit 115 ... Radiating equipment 116 ... Hot water branch valve 117 ... Power receiving power line

Claims (12)

[Claims] 1. A hot water generator that generates hot water using heat discharged from a small-scale power generation facility, and a hot water user that is piped from the hot water generator to a hot water user and uses the hot water generated by the hot water generator. A district hot water supply system, comprising: 2. The district hot water supply system according to claim 1, wherein a micro gas turbine generator or a fuel cell that generates electric power of several tens to several hundreds of kW is used as the small-scale power generation facility. 3. The regional hot water supply system according to claim 1, wherein a hot water generator that heats tap water to generate hot water is used as the hot water generator. 4. The district hot water supply system according to claim 1, 2 or 3, wherein the hot water generator is provided with heat dissipation equipment that performs heat dissipation operation in response to a decrease in hot water demand. 5. The regional hot water supply system according to claim 1, wherein a function of an electric water heater capable of electrically generating hot water is added to the hot water generator. 6. A raw water thermometer for measuring the temperature of raw water introduced into the hot water generator, and a hot water thermometer for measuring the temperature of hot water supplied to a hot water user and a hot water flow meter for measuring the flow rate of hot water. The district hot water supply system according to any one of claims 1 to 5, wherein the district hot water supply system is provided. 7. The hot water flow meter detects the start of the hot water flow and starts measuring the hot water flow meter and the hot water thermometer, and the hot water flow meter detects the stop of the hot water flow and measures the hot water flow meter and the hot water thermometer. The district hot water supply system according to claim 6, which is stopped. 8. A raw water thermometer stores measurement data obtained by measuring the temperature of raw water every predetermined time in a memory, and a hot water thermometer stores measurement data obtained by measuring temperature of hot water at a predetermined time in the memory, The regional hot water supply system according to claim 6 or 7, wherein the flow meter accumulates measurement data in which the hot water flow rate for a predetermined time is sequentially measured in a memory. 9. A remote monitoring center connected to the raw water thermometer, the hot water thermometer and the hot water flow meter by a communication line reads the raw data thermometer's accumulated data, the hot water thermometer's accumulated data and the warm water flow meter's accumulated data. 9. The method according to claim 8, wherein
District hot water supply system described. 10. The accumulated data of the raw water thermometer, the accumulated data of the warm water thermometer and the accumulated data of the warm water flow meter are read by a portable dedicated terminal connected to the raw water thermometer, the warm water thermometer and the warm water flow meter. The regional hot water supply system according to claim 8. 11. The remote monitoring center calculates the temperature rise value of the temperature difference between the raw water temperature and the hot water temperature from the raw water thermometer data and the hot water thermometer data, and obtains the hot water flow rate obtained from the hot water flow meter data. The regional hot water supply system according to claim 9, wherein the amount of heat energy supplied is calculated by multiplying the temperature rise value. 12. In a billing method for a regional hot water supply system, which heats raw water by a hot water generator to generate hot water and supplies the hot water to users, the temperature of the raw water introduced into the hot water generator is measured by a raw water thermometer, Hot water The temperature of hot water supplied to users is measured with a hot water thermometer, the flow rate of hot water is measured with a hot water flow meter, and the temperature rise value of the temperature difference between the raw water temperature and the hot water temperature is calculated. The charging method is characterized in that the heat energy supply amount is calculated by multiplying by, and the hot water usage fee is charged based on the heat energy supply amount.