JP2007138562A - Tap water line temperature stabilizing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of stabilizing a tap water temperature safely to a summer season temperature to make fuel and light expenses lower than the present expenses for tap water consumers, introducible into many areas because of not costing much for installation without needing to lay a line in addition to an existing tap water line and furthermore reducing CO<SB>2</SB>, utilizing waste heat from garbage incineration and recovering waste heat generated in a factory in a area into which this method is introduced, which leads also to countermeasures against global warming and heat islands. <P>SOLUTION: A tap water line through which tap water is circulated, or a flow-through tap water line without a stop or an extreme decrease of a tap water flow is set from a tap water line extending in the order of a purification plant to a service reservoir to a water supply station to a main pipe and to a branch pipe, and a heat exchange part which receives heat from a waste heat source is interposed in the set line. Tap water variable according to the season is heated to 20-35°C and returned to the tap water line. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for stabilizing tap water temperature for supplying tap water at a constant temperature throughout the year. More specifically, the present invention relates to a method for heating tap water and stabilizing the tap water temperature by exchanging heat between waste heat generated from a waste incinerator, a thermal power plant, and the like and tap water.

  Tap water is water (raw water) suitable for water quality inspection by purifying water (raw water) taken from water sources such as rivers to remove turbidity and harmful substances. FIG. 1 is a flow chart from when water is taken from a water source such as a river until it is sent as tap water to a consumer such as a home, a store, or a company. Water from a water source such as a river is taken in by a water intake 1 and sent to a water purification plant 2. The water sent to the water purification plant 2 is subjected to water purification treatment at the water purification plant 2 to become purified water (tap water) and is sent to the distribution reservoir 3. The tap water sent to the distribution reservoir 3 is stored in the distribution reservoir 3, and is sent to the customer 5, such as a home, a store, or a company, via the water supply station 4 according to the amount of use.

  The water temperature of the tap water obtained by the above method is affected by the outside air temperature because it is exposed to the outside air at the water source, the distribution reservoir 3, etc., and is therefore affected by changes in the outside air temperature due to seasonal changes. fluctuate. Although this variation varies depending on the region, for example, as disclosed in Non-Patent Document 1, near the Tokyo Metropolitan Government Office, the annual variation is 20.4 ° C from a minimum of 6.0 ° C to a maximum of 26.4 ° C in FY2003. The tap water sent to consumers 5, such as households, stores, and companies, has a low water temperature in winter when the outside temperature is low, and a high water temperature in summer when the outside temperature is high.

  By the way, the consumer 5 uses the water as it is sent from the water supply station 4 as it is, and also draws the tap water into the customer's premises and then uses it as hot water using the hot water generator 7 such as a hot water supply facility. For example, the water temperature may be changed by an external means. For example, in homes, the proportion of the amount of tap water that is warmed with a water heater and used as hot water for bathing is large.

Also, in order to obtain hot water of the same temperature in winter when the water temperature is low and in summer when the water temperature is high, more energy is required for the hot water generator in winter when the water temperature is low, and the utility cost is also high. For this reason, there is a problem that the utility cost in winter is higher than that in summer. For example, if you use Tokyo Gas Co., Ltd. RF type No. 24 bath water heater as a hot water generator and boil a bath (40 ° C) in a 200 L bathtub in July when the water temperature is high and January when the water temperature is low, Tokyo Gas Co., Ltd. It is disclosed in Non-Patent Document 2 that the company's gas rate is about 33 yen / time in July, whereas it is about 79 yen / time in January, which is more than twice as much as July. ing. Furthermore, if you use a hot water shower for 5 minutes at a water flow rate of 12 L / min per person, you will use 60 L / time / person of hot water, and the average household size is 2.21 people. When a hot water shower is used, it becomes 60 × 2.21 = 132.6 L / time / household hot water usage. Similar to the method disclosed in Non-Patent Document 2, when using a Tokyo Gas Co., Ltd. RF type No. 24 bath water heater and all household members use a hot water shower (40 ° C.), The gas fee is about 22 yen / time / household in July, but it is more than twice as much in January as it is about 52 yen / time / household in July.
In other words, if one household boiles a bath (40 ° C) once in a 200L bathtub and all household members use a hot water shower (40 ° C), the gas price of Tokyo Gas Co., Ltd. is 33 + 22 = While it is 55 yen / time / household, in January it will be 79 + 52 = 131 yen / time / household.
Here, the water flow rate and time when using the hot water shower are the values disclosed in Non-Patent Document 3, and the average number of households is as follows: Non-Patent Document 4 shows that the population of Tokyo in the 2000 national census is 11864419 Since it is disclosed that the number of households is 5371557, it was calculated from the population and the number of households.

  Therefore, in the customer premises after the water meter of the water supply pipe branched from the water distribution pipe, a heat exchanger is buried in the underground room temperature zone, and a heat exchanger is connected to the water supply pipe throughout the year. Patent Document 1 discloses an apparatus for normal temperature of tap water in which tap water becomes normal temperature.

  However, the method disclosed in Patent Document 1 can obtain tap water having a stable water temperature, but heat exchange buried in the ground generally held at about 12 ° C. in a layer of 3 to 5 m or less from the ground surface. Due to the structure that uses geothermal heat in the vessel, the water temperature of the tap water obtained is about 12 ° C., similar to the underground temperature. The annual average tap water temperature in the vicinity of the Tokyo Metropolitan Government in FY2003 is 16.3 ° C. as disclosed in Non-Patent Document 1, so the stable water temperature obtained in Patent Document 1 is current throughout the year. The temperature is lower than the annual average water temperature. Therefore, similar to the method disclosed in Non-Patent Document 2, the RF type No. 24 bath water heater manufactured by Tokyo Gas Co., Ltd. is used, a bath (40 ° C.) is boiled in a 200 L bathtub, and all household members are showered with hot water When using (40 ° C), the gas price of Tokyo Gas Co., Ltd. is about 98 yen / time annually at the current tap water temperature, whereas the method disclosed in Patent Document 1 is 115 yen / time. It does not reduce utility costs.

In addition, in the method disclosed in Patent Document 1, the embedding depth of a small pipe (water supply pipe) branched to a water pipe main pipe (distribution pipe) on the side that is generally supplied to consumers is at most about 2 m in the ground, For this reason, the chilled water (heated water) after using geothermal heat in the heat exchanger is again heated by the outside air temperature, and the water meter after the water meter of the water pipe branched from the water distribution pipe is prevented from approaching the outside air temperature. It is necessary to embed a heat exchanger in the customer premises.
In other words, in order to minimize the heat lost by the outside air, consumers such as homes, stores, and companies need to embed a heat exchanger near the use location. There is also a problem that the equipment burden is heavy to depend on.
In addition, since Patent Document 1 is an open type in order to improve the heat absorption of the heat exchanger itself, there is also a circumstance that cold water (warming water) after heat exchange once cannot be returned to the water absorption pipe side (for safety). .

Recently, the global average temperature has been on the rise, and this global warming phenomenon is caused by the expansion of human activities in the atmosphere of greenhouse gases such as carbon dioxide (CO ₂ ) and methane (CH ₄ ). It is said that the concentration has increased. In addition, global warming phenomenon is a problem on a global scale, the Kyoto Protocol mandating the reduction of CO _2, etc. six kinds of greenhouse gases in industrialized countries, including Japan, in February 2005, has been entered into force. In particular, each consumer uses hot water generators to generate hot water, which generates CO _2, one of the greenhouse gases, which contributes to global warming and requires CO ₂ reduction. Is

Also, compared to the city center and suburbs, there is also a phenomenon called the heat island phenomenon in which the city's temperature is always higher, and one of the causes is the increase in energy use due to the concentration of the population in the city, and the amount of waste heat. Is increasing.
As a countermeasure for heat island, the method for reducing the amount of exhaust heat includes, for example, suppression of exhaust gas from vehicles, use of heat insulating material in housing construction, introduction of wind power generation system, etc., and waste incineration exhaust heat. And the recovery of waste heat generated in factories is also required.

  Therefore, in recent years, some hot water pools and recreational facilities have been installed near the incineration plant to effectively use the exhaust heat from incinerators, etc., and part of the tap water has been warmed and used for hot water pools and hot water supplies. is there. FIG. 2A is a flow diagram of a system for heating and supplying tap water to a warm water pool and a recreational facility. The water facility operator supplies the tap water obtained at the water purification plant 11 to the distribution reservoir 12 and the water supply station 13. Then, hot water is generated by the hot water generator 14 near the cleaning factory through the water distribution pipe (main pipe) 15 and the water supply pipe (branch pipe) 16 and sent to a customer who is provided with a hot water pool and a recreational facility. This system is a hot water pool in Yumenoshima Park, which uses the exhaust heat from the Koto Incineration Plant in Tokyo, and the Shinagawa Yashio Danchi District, which uses the exhaust heat from the Tokyo Oi Incineration Plant for heating hot water, and the Nerima Incineration Plant in Tokyo. It has already been put into practical use in some areas, such as the Hikarigaoka housing complex, where the exhaust heat from the Hikarigaoka branch is used for heating and hot water.

And the system of FIG. 2 (B) is examined as what utilized the exhaust heat of such an incinerator etc. using an effective utilization system (unknown comparative technique).
This comparative example is a flow diagram of a system that uses waste heat from the incinerator or the like to heat a part of tap water in the main pipe downstream from the distribution reservoir and then supply it to the customer. The operator sends the water obtained at the water purification plant 21 to the distributing reservoir 22, and the tap water discharged from the distributing reservoir 22 passes through the water supply station 23, and a part of the exhaust heat utilization heat exchanger 24 of the exhaust heat source 25 such as an incinerator. For example, hot water of 50-60 ° C. that can supply hot water, and another part is sent as it is to the customer as water. The customer uses the hot water of 50-60 ° C. that has been sent to the hot water supply, and the water is appropriately used according to the purpose such as use as purified water.

  As compared with the current system of FIG. 2 (A), the water facility operator uses the waste heat in the system that generates the hot water by effectively utilizing the exhaust heat as shown in FIG. 2 (B) and sends it to the consumer. Thus, it is possible to supply hot water with high added value at a low cost, and there is an advantage that the customer needs less energy for the hot water generator, and the exhaust heat generator effectively uses the exhaust heat to reduce the amount of exhaust heat treatment.

Japanese Patent Laid-Open No. 2003-27534 Tokyo Waterworks Bureau http://www.waterworks.metro.tokyo.jp/ Energy Saving Eco Life Tokyo Gas Co., Ltd. http://www.tokyo-gas.co.jp/ultraene/ Environmental Report Noritz Corporation http://www.noritz.co.jp/eco/shiryo/img/2003kankyou.pdf Tokyo Metropolitan Government General Affairs Bureau Statistics Department http://www.toukei.metro.tokyo.jp/

  However, in the method shown in FIG. 2 (B), it is necessary to separately lay a hot water line in addition to a normal tap water line that is not heated, and not only a great installation cost is required, but also water supply. Since the tap water in the main pipe downstream from the station is one-way stagnant water, this hot water line is 50 ° C. or higher, so that various germs are likely to propagate, especially at temperatures below the protein freezing point of 35 ° C. to 60 ° C. Therefore, it is difficult for bacteria to propagate and it cannot be used as domestic water.

  In addition, even the method shown in FIG. 2A cannot solve the problem of high utility costs in winter disclosed in Non-Patent Document 2. Furthermore, even when doing housework such as cooking, washing, cleaning, etc., where tap water can be used as it is in the summer, the water must be warmed to 20-40 ° C because the water temperature is low in the winter. There is also a problem.

  In addition, a water treatment plant that sends tap water with normal water temperature that is not warmed from the water treatment plant to the distribution area, and from the distribution reservoir to the customer → distribution reservoir → water supply station → a line that sends tap water at the normal water temperature of the customer For water pipes, the embedding depth of small pipes (water supply pipes) branched into main pipes (distribution pipes) is at most about 2 m in the ground, so it is necessary to take measures to prevent freezing of small pipes over a wide area. It is also a factor of higher costs.

  In addition, in the methods shown in FIGS. 2 (A) and 2 (B), normal tap water that is not warmed is, as described above, for example, near the Tokyo Metropolitan Government, the annual fluctuation is at least 6 in FY2003. The problem of not being able to supply tap water at a stable temperature has not been solved so that there is a fluctuation range of 20.4 ° C. from 0.0 ° C. to a maximum of 26.4 ° C.

Therefore, in the present invention, it is not necessary to lay a hot water line in addition to the current tap water line, so that a large installation cost is not required, and it is possible to introduce the method of the present invention in many areas. reduce CO ₂ emissions than the current in the introduction to the area, it is possible to perform the recovery of waste heat generated in the use and factory waste incineration waste heat, as a result also leads to global warming and heat island countermeasures, tap water consumers is The object is to provide a method for stabilizing the tap water temperature at the summer season temperature, where the utility cost is cheaper than the present.

As described above, if the tap water temperature is too low at around 5 ° C. as in the winter season, there is a problem that the utility cost of the consumer becomes high, and if it is too high at 50-60 ° C., the growth of Legionella spp. Will prompt you. Therefore, when stabilizing the tap water temperature, it is higher than the current average tap water temperature (for example, 16.3 ° C. as described above in the vicinity of the Tokyo Metropolitan Government Office), and the temperature at which Legionella and other bacteria grow well (35 ° C. to 60 ° C.). ) Lower temperature is better. In particular, the current summer tap water temperature (for example, 26.4 ° C in the vicinity of the Tokyo Metropolitan Government) has been confirmed by past use of tap water in the summer, and there is no problem with the growth of Legionella spp. It is the first gist of the present invention to pay attention to the fact that the utility cost can be suppressed at a low cost because it is high, and that it is suitable for stabilizing the tap water temperature.
The second gist is that no major changes are made to the current tap water line.
The tap water line from the current water treatment plant-distributing reservoir-water supply station-main pipe-branch pipe is established as infrastructure, and it is not allowed to change it.
The third gist is to install a heat exchanger in a line through which tap water circulates.
For example, tap water does not circulate like a main pipe or branch pipe between customers from a water supply station, and even if a heat exchange part that receives heat from an exhaust heat source is installed in a part where the flow stops or extremely decreases Exhaust heat utilization will be significantly reduced. Moreover, if the flow of tap water does not stop or extremely decrease, a heat exchanger can be installed in the once-through line.
In order to solve the above problems, in the present invention,
Set the tap water line part where the tap water circulates from the tap water line leading to the water purification plant-distribution pond-water supply station-main pipe-branch, and install the heat exchange part that receives heat from the exhaust heat source in the setting line, The seasonally changing tap water is heated to 20 to 35 ° C., preferably 25 to 30 ° C. corresponding to the summer seasonal temperature, and returned to the tap water line.
In addition, the tap water flow is stopped from the tap water line leading to the water purification plant-distribution pond-water supply station-mains-branch, or there is no extreme phenomenon. It is characterized in that the seasonally changing tap water is heated to a temperature of 20 to 35 ° C. and returned to the tap water line through a heat exchange part that receives heat.

The line part to be set may be anywhere as long as it is a tap water line part from the water purification plant, the distribution pond, the water supply station, the main pipe, and the branch pipe, but generally the downstream of the water supply station has a flow rate depending on the amount of tap water used by consumers. Because it is not stable and the water supply line is one-way from the water supply station to the main pipe to the branch pipe, even if a heat exchanger is interposed during this period, local heating and temperature fluctuations occur at the part where the heat exchanger is interposed Occurs. The same applies to the water supply line upstream of the water reservoir. Therefore, if it is a water supply line between a water reservoir and a water supply station, a circulation line has already been set, the temperature can be made constant, and the temperature from the water supply station to the main pipe to the branch pipe can be stabilized.
In addition, since the tap water line from the water purification plant-distribution pond-water supply station-mains-branch is generally meshed, the tap water line downstream of the water supply plant and upstream of the water distribution plant-distribution pond. However, it is possible to set a line that actively circulates by changing the direction of tap water flow by operating valves, pumps, etc., or a once-through tap water line that stops the flow of tap water or has no extreme phenomenon. The temperature can be stabilized.
In particular, downstream of the water supply station, there are so many branch pipes that branch off from the main pipe. Therefore, a line that circulates only some of the branch pipes or a one-way tap water line that stops the flow of tap water or has no extreme phenomenon. By setting and interposing a heat exchange section that receives heat from the exhaust heat source in the setting line, it is possible to supply tap water whose temperature is stabilized only to some consumers.

  Claim 4 is an invention relating to an apparatus for effectively carrying out the present invention, and sets a tap water line part where tap water circulates from a tap water line leading to a water purification plant-distribution pond-water supply station-main pipe-branch. A tap water introduction line that is introduced into a heat exchange section that receives heat from an exhaust heat source from an upstream side of a valve provided in the line, and a return line that returns warm water heated by a heat exchanger on the downstream side of the valve to the tap water line The tap water is controlled to a temperature of 20 to 35 ° C., preferably 25 to 30 ° C. corresponding to the summer season temperature by adjusting the degree of opening and closing of the heat exchanger and the valve, and returned to the tap water line downstream of the valve. And

According to the present invention, since the heated water is returned to the tap water line, the existing tap water line can be diverted as it is, and there is no need to lay a hot water line. Since there is no installation cost, it can be installed in many areas.
In addition, since it is a circulation line if it is a water supply line from a reservoir to a water supply pipe, a circulation control pump is used as a heat source for heating even if the waste heat such as waste incineration waste heat or factory waste heat is high. Then, the heating can be controlled to a temperature of 20 to 35 ° C., preferably 25 to 30 ° C. corresponding to the summer season temperature. This is a great effect because there is no problem of growth of Legionella spp.
Moreover, since the temperature to heat is 20-35 degreeC, Preferably it is 25-30 degreeC corresponding to a summer season temperature, The heat | fever of the low pressure condenser normally discarded to air | atmosphere or seawater can also be utilized. Since this heat source is usually steam at about 60 ° C., for example, it is not suitable for supplying high-temperature water as shown in FIG. 2B. However, according to the present invention, steam at about 60 ° C. is heated to about 60 ° C. By using the coagulation heat which becomes water (condensate), 20 to 35 ° C., preferably 25 to 30 ° C. corresponding to the summer season temperature is produced, so that the waste heat can be used. The energy (heat) that has been discarded is about 30 to 40% of the total as shown in the image diagram of FIG. 6, which is close to the amount of power generation, and it is very effective to reuse it. In this way, there is a great effect of promoting the reuse of energy that has been discarded.
Furthermore, since the consumer can always use tap water having a water temperature stabilized at a temperature of 25 to 30 ° C. corresponding to the temperature of 20 to 35 ° C., preferably corresponding to the summer season temperature, the rise required to obtain the hot water is obtained. The temperature range is smaller than the current one, so that the utility cost can be reduced and the amount of CO ₂ generated when the temperature is raised by the consumer can also be reduced.
Therefore, according to the present invention, since there is no need for laying a hot water line in addition to the existing tap water line and it does not require a large installation cost, it can be introduced in many areas, and the method of the present invention is further introduced. In this area, CO ₂ reduction, use of waste incineration waste heat, and recovery of waste heat generated in factories can be performed, leading to measures against global warming and heat islands. In addition, it is possible to provide a method for stabilizing the tap water temperature at the summer season temperature, where the utility cost is lower than the current one.
Further, according to the inventions of the fourth to sixth aspects, since the upstream and downstream water lines are divided through the valve and the heat exchanger is installed, the load on the heat exchanger side is excessive or spring. Even if the temperature difference between the heating temperature is small as in autumn, the tap water can be maintained at 20 to 35 ° C., preferably 25 to 30 ° C. corresponding to the summer season temperature, in combination with the valve opening control.
In this case, it is effective that the heat exchanger is connected to a waste heat source of a waste treatment facility, but other factory heat sources can also be used.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples. Not too much.

  FIG. 3 is a flowchart of the tap water line temperature stabilization method of the present invention in which the set line part is between the distribution reservoir and the water supply station. The tap water obtained by purifying the raw water at the water purification plant 31 is sent to the distribution reservoir 32. The tap water sent to the distribution reservoir 32 is stored in the distribution reservoir 32 and circulates between the distribution reservoir 32 and the water supply station 38 via the tap water line main pipe 37. The tap water circulating between the distribution reservoir 32 and the water supply station 38 is sent to the heating device 33 by the circulation control pump 341 via the heating device-bound line 34 branched from the tap water line main pipe 37. The tap water sent to the warming device 33 is heated by the warming device 33 to waste heat such as waste incineration exhaust heat and factory exhaust heat, and is heated to the summer seasonal temperature. The tap water heated to the summer season temperature returns to the tap water line main pipe 37 via the heating device return line 35 branched from the tap water line main pipe 37 and circulates between the distribution reservoir 32 and the water supply station 38. Then, depending on the usage amount of the consumer, it is sent from the water supply station 38 to the consumer as tap water having a summer season temperature. The consumer uses the tap water heated to the summer seasonal temperature as purified water as it is, or uses it as hot water using the hot water generator 39 provided after the water meter 40 in the customer premises. Use as appropriate.

Further, a gate valve 36 is provided on the tap water line main pipe 37 and between the heating device going line 34 and the heating device return line 35. Usually, the tap water can be heated through the warming device 33 by closing the gate valve 36. Even when the heating device 33 cannot be used due to repair or inspection, the heating device 33 is opened without stopping the supply of tap water to the customer by opening the gate valve 36 and bypassing the heating device 33 with tap water. Can be repaired and inspected.
Moreover, since the passage amount and bypass amount of the heating apparatus 33 can be adjusted by adjusting the opening degree of the gate valve 36, the gate valve 36 can also be used as a tap water temperature control valve.

FIG. 5 is a flow diagram around the heating device 33 that can obtain tap water having a summer season temperature by exchanging heat between the turbine exhaust steam and tap water. The tap water in the tap water line main pipe 37 enters the heating device 33 from the line 34 for the heating device, is heat-exchanged with the turbine exhaust steam in the heating device 33, and is heated to the summer seasonal temperature. Return to the tap water line main pipe 37 via the return line 35. On the other hand, the exhaust steam generated in the turbine 61 is adjusted in the exhaust pressure by instructing and adjusting the cooling amount of the condenser 63 by the pressure instruction adjustment (PIC) 62. The turbine exhaust steam whose exhaust pressure has been adjusted enters the heating device 33 from the heating device exhaust heat inlet line 64 and is heat-exchanged with tap water. The exhaust steam heat-exchanged with tap water is sent to the condensate tank 66 through the heating device exhaust heat outlet line 65 as condensate.
Further, by adjusting the indication of the temperature indication adjustment (TIC) 67, the opening degree of the temperature adjustment valve 68 provided on the heating device exhaust heat inlet line 64, that is, the amount of exhaust steam flowing into the heating device is adjusted. Thus, the water temperature of the heating device return line 35 can be kept stable at the summer season temperature. By adjusting the opening of the gate valve 36, that is, the amount of tap water that bypasses the heater, by adjusting the indication of the temperature indicator (TIC) 67 using the gate valve 36 as an adjustment valve, the water temperature of the heater return line 35 is adjusted. Can be kept stable at the summer seasonal temperature.
Further, by adjusting the opening of the liquid level adjustment valve 70 provided on the heating device exhaust heat outlet line 65 by the indication adjustment of the liquid level indication adjustment (LIC) 69, the exhaust steam side in the heating device is adjusted. The liquid level is adjusted to prevent steam from flowing into the condensate tank 66. Further, by adjusting the temperature indication adjustment (TIC) 71, the temperature adjustment valve 72 provided on the heating device line 34 is adjusted. By adjusting the opening, the condensate temperature in the heating device exhaust heat outlet line 65 is adjusted to prevent overcooling of the condensate.
In this case, the turbine exhaust steam is used as an exhaust heat source for exchanging heat with tap water, but any exhaust heat may be used. Further, the flow around the heating device 33 is not limited to the flow shown in FIG.

  As described above, by using the method of the present invention, exhaust heat can be used effectively, which is very effective as a heat island countermeasure.

  In addition, when performing the temperature stabilization method of the present invention, newly required facilities are the heating device 33, the heating device line 34, the heating device return line 35, the gate valve 36, and the respective auxiliary facilities. Yes, for example, there is no need for hot water piping, which was necessary in the method of FIGS. 2 (A) and 2 (B). For this reason, it is possible to install the equipment at a lower cost because the installation cost of the pipe dedicated to hot water is not required as compared with the method of FIGS.

  As explained in the background section above, the average water temperature in the vicinity of the current Tokyo Metropolitan Government is 16.3 ° C., and the temperature stabilization method of the present invention stabilizes the average water temperature at the summer seasonal temperature throughout the year. Can do. For example, when a customer uses a water temperature that is stable at a summer seasonal temperature of 27 ° C., the RF type No. 24 bath water heater manufactured by Tokyo Gas Co., Ltd. is used similarly to the method disclosed in Non-Patent Document 2, and 200 L When a bath (40 ° C) is boiled in a bathtub and all household members use a hot water shower (40 ° C), the average water price for the current tap water is approximately 98 yen / time at the gas price of Tokyo Gas Co., Ltd. On the other hand, the tap water temperature stabilized at 27 ° C. is 54 yen / time by the method of the present invention, and the gas charge used to boil the bath can be reduced to 54/98 = 55%. In the consumer who uses the hot water shower, all the household members will save (98-54) x 365 = 16060 yen / year. When the present invention is implemented throughout Tokyo, the number of households in Tokyo is 5,371,057 as described above. Therefore, when the present invention is implemented throughout Tokyo, 16060 (yen / household / year) × 5371057 (household) = 86.3 billion yen / year.

In addition, since the average water temperature is higher than the current level, the energy required to generate hot water at the customer can be reduced, the amount of CO ₂ generated by the generation of hot water at the customer can be reduced, and as a measure against global warming. It is valid. For example, in a consumer who makes a bath every day and all the household members use a hot water shower, the gas usage calculated by the method disclosed in Non-Patent Document 2 is 0.87 m ³ to 0.48 m per day. ³ can be reduced by 0.39 m ³ / day. According to the Ministry, for environmental household accounts carbon dioxide emission factors (carbon dioxide equivalent) is 2.2 (2.2 kg per city gas 1 m ^3), wherein the customer, 0.39 per day × 2.2 = 0.858 kg of CO ₂ emissions can be reduced. As described above, since the number of households in Tokyo is 5,371,057, when the present invention is implemented throughout Tokyo, 0.858 (kg / day / household) × 365 (day / year) × 5371057 (household) = CO ₂ emissions of 1.68 million tons / year can be reduced.
The target for greenhouse gas reduction according to the Kyoto Protocol is 6% (74 million tons / year) of 1,233 million tons in the base year (1990). By implementing the present invention throughout Tokyo, 2.27% (168,000 / 74 million%) of greenhouse gas reduction target of Kyoto Protocol can be achieved.

FIG. 4 is a flowchart of the tap water line temperature stabilization method of the present invention in which the set line part is a distribution reservoir. The tap water obtained by purifying the raw water at the water purification plant 51 is sent to the distribution reservoir 52. The tap water in the distributing reservoir 52 is sent to the heating device 53 by the circulation control pump 541 via the heating device-bound line 54. The tap water sent to the warming device 53 is heat-exchanged by the warming device 53 with waste heat such as waste incineration waste heat and factory waste heat, and the temperature is raised to the summer seasonal temperature. The tap water heated to the summer seasonal temperature is returned and stored again to the distribution reservoir 52 via the heating device return line 55, and circulates in the distribution reservoir 52-water supply station 58 according to the usage amount of the consumer. Then, it is sent from the water supply station 58 to the customer. For the purpose of use, the consumer uses the tap water heated to the summer seasonal temperature as purified water as it is, or uses it as hot water using the hot water generator 59 provided after the water meter 60 in the customer premises. Use as appropriate.
In addition, when the heating device 53 cannot be used due to repair or inspection, the water supply to the heating device 53 is stopped and the water is directly supplied to the customer, so that the supply of tap water to the customer is not stopped. The device 53 can be repaired or inspected.

  Further, the flow around the hot water generator 53 is the same as that in FIG. 5 using the turbine exhaust steam as in the first embodiment. As in the first embodiment, the exhaust heat can be used effectively, which is very effective as a heat island countermeasure. Also, newly required facilities are a heating device 53, a heating device-bound line 54, a heating device return line 55, and the respective incidental facilities. For example, in the method of FIGS. 2A and 2B, There is no need for the dedicated hot water piping. For this reason, it is possible to install the equipment at a lower cost because the installation cost of the pipe dedicated to hot water is not required as compared with the method of FIGS.

  When using the tap water heated to the summer seasonal temperature, the customer generates hot water using the hot water generator 58 held by the customer, and uses the water as it is when using the water. To do. At this time, as in Example 1, the RF type No. 24 bath water heater manufactured by Tokyo Gas Co., Ltd. was used, the bath (40 ° C) was boiled in a 200 L bathtub, and all household members used hot water showers (40 ° C). In this case, the gas price of Tokyo Gas Co., Ltd. is about 98 yen / time per year at the current tap water temperature, whereas it is 54 yen / time at a tap water temperature stabilized at 27 ° C. by the method of the present invention. The gas charge used to boil the bath can be reduced to 54/98 = 55%. For customers who boil the bath every day and all household members use hot water showers, (98-54) x 365 = 16060 yen / year. When the present invention is implemented throughout Tokyo as in the first embodiment, 88.3 billion yen / year is saved.

In addition, since the average water temperature is higher than the current level, the energy required to generate hot water at the customer can be reduced, the amount of CO ₂ generated by the generation of hot water at the customer can be reduced, and as a measure against global warming. It is valid. When the present invention is implemented throughout Tokyo as in Example 1, the amount of reduction can be reduced to 16.68 million tons / year of CO ₂ emissions, which is the greenhouse gas reduction target of 2.27 according to the Kyoto Protocol. %.

According to the present invention, in addition to the existing tap water line, there is no need for laying a hot water line and there is no great installation cost, so it can be introduced in many areas, and the method of the present invention is further introduced. In this area, CO ₂ reduction, use of waste incineration waste heat, and recovery of waste heat generated in factories can be performed, leading to measures against global warming and heat islands. In addition, it is possible to provide a method for stabilizing the tap water temperature at the summer season temperature, where the utility cost is lower than the current one.

It is a flow figure after taking water from water sources, such as a river, and being sent as tap water to consumers, such as a household, a store, and a company. Fig. 2 (A) is a flow chart of a system for heating and supplying tap water to a hot water pool or a recreational facility. Fig. 2 (B) is a system that is considered as an effective use of exhaust heat from an incinerator or the like. FIG. It is a flowchart of the tap water line temperature stabilization method of this invention which made the setting line site | part between a distribution reservoir and a water supply station. It is a flowchart of the tap water line temperature stabilization method of this invention which used the setting line site | part as a distribution reservoir. FIG. 5 is a flow diagram around a heating device that can obtain tap water having a summer season temperature by exchanging heat between turbine exhaust steam and tap water. It is an image figure of the heat | fever of a low pressure condenser.

Explanation of symbols

31 Water Purification Plant 32 Reservoir 33 Heating Device 34 Heating Device Line 35 Heating Device Return Line 36 Gate Valve 37 Tap Water Line Main Line 38 Water Station 39 Hot Water Generator 40 Meter 341 Circulation Control Pump

Claims (9)

  Set the tap water line part where the tap water circulates from the tap water line leading to the water purification plant-distribution pond-water supply station-main pipe-branch, and install the heat exchange part that receives heat from the exhaust heat source in the setting line, A method for stabilizing the temperature of a tap water line, characterized in that the seasonally changing tap water is heated to a temperature of 20 to 35 ° C. and returned to the tap water line.   The tap water flow stops from the tap water line leading to the water purification plant, distribution pond, water supply station, main pipe, and branch pipe, or a flow through the tap water line where there is no extreme phenomenon is set, and the heat received from the exhaust heat source in the setting line A method for stabilizing the temperature of a tap water line, characterized by heating the tap water that varies seasonally to a temperature of 20 to 35 ° C. and returning it to the tap water line through an exchange unit.   The water supply according to claim 1 or 2, wherein the heating temperature is 25 to 30 ° C corresponding to a summer season temperature, and the set line portion is a water supply line or a water supply reservoir between a water supply reservoir and a water supply station. Water line temperature stabilization method.   The tap water line temperature stabilization method according to claim 1 or 2, wherein the waste heat is waste heat of a waste treatment facility.   Set the tap water line part where the tap water circulates from the tap water line leading to the water purification plant-distribution pond-water supply station-main pipe-branch, and install the heat exchange part that receives heat from the exhaust heat source in the setting line, A tap water line temperature stabilization device configured to heat seasonally changing tap water to a temperature of 20 to 35 ° C. and return it to the tap water line.   Set up a tap water line where there is no stoppage or extreme phenomenon from the tap water line leading to the water purification plant-distribution pond-water supply station-mains-branch, and receive heat from the exhaust heat source in the setting line A tap water line temperature stabilization device configured to heat seasonally changing tap water to a temperature of 20 to 35 ° C. and return the tap water to the tap water line.   The tap water introduction line introduced into the heat exchange section that receives heat from the exhaust heat source from the upstream side of the valve provided in the setting line, and the warm water heated by the heat exchanger on the downstream side of the valve is returned to the tap water line. The tap water line temperature stabilization device according to claim 5 or 6, wherein a return line is provided.   8. The tap water line temperature stabilizing device according to claim 7, wherein the tap water is controlled to a temperature of 20 to 35 [deg.] C. by adjusting the degree of opening and closing of the heat exchanger and the valve and returned to the tap water line downstream of the valve.   The tap water line temperature stabilization device according to claim 5 or 6, wherein the heat exchanger is connected to a waste heat source of a waste treatment facility.

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