JP2005052793A - Purified water feed device having thermoelectric cogeneration apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a purified water feed device capable of producing purified water while suppressing its operating cost. <P>SOLUTION: A pressure feed pump 32 for feeding raw water to a water purification apparatus 30 having a reverse osmosis membrane 31 under pressure is driven by the electric power generated by a thermoelectric cogeneration apparatus 20, and raw water fed to the water purification apparatus 30 is heated to a prescribed temperature by waste heat from the thermoelectric cogeneration apparatus 20. The warm water purified by the water purification apparatus 30 exchanges heat with raw water before heating to preheat the raw water, and simultaneously to obtain purified normal temperature water. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a purified water supply device that has a combined heat and power supply device and purifies domestic wastewater, groundwater, and the like.

  Conventionally, facilities such as factories, hotels, schools, hospitals, and office buildings that use a lot of water recycle raw water such as domestic wastewater and groundwater in order to reduce tap water (city water) purchased from outside. A purified water device that purifies the available purified water may be used. As such a purified water device, a purified water device using a reverse osmosis membrane (RO membrane) is widely used.

  However, the purified water device using a reverse osmosis membrane uses a high-pressure pump or the like that feeds raw water to the reverse osmosis membrane at a high pressure, and thus requires a lot of electric power and has a problem of increasing operating costs.

  An object of this invention is to provide the purified water supply apparatus which can produce | generate purified water, suppressing operating cost.

  The present invention provides the following means.

  (1) A purified water device having a reverse osmosis membrane, a raw water path for supplying raw water to the purified water device, a pressure supply pump for pressurizing and supplying raw water in the raw water path to the reverse osmosis membrane, heat and electric power A heat and power supply device that simultaneously generates raw water heating means for heating raw water in the raw water path to warm water of a predetermined temperature by heat generated by the heat and power supply device, and electric power generated by the heat and power supply device. A purified water supply device having a combined heat and power supply device, comprising an internal power supply path for supplying the pump.

  (2) The raw water heating means includes a heat exchanger that heats raw water in the raw water path by heat of a heat medium circulating in the combined heat and power supply device, and a heat medium circulation pump that sends the heat medium to the heat exchanger. A raw water temperature detector for detecting the temperature of the raw water heated in the heat exchanger, and a heat medium circulation for driving and controlling the heat medium circulation pump so that the temperature becomes the predetermined temperature according to the temperature of the raw water A purified water supply apparatus having the combined heat and power supply apparatus according to the preceding item 1, characterized by comprising a pump control means.

  (3) The internal power supply path is configured to supply the electric power generated by the cogeneration device also to the heat medium circulation pump and the heat medium circulation pump control means. Purified water supply device having a combined heat and power supply device.

  (4) The preceding item characterized by comprising a purified water heat exchanger for preheating raw water before being heated to warm water of a predetermined temperature by the combined heat and power device by the heat of purified water purified by the purified water device The purified water supply apparatus which has a combined heat and power supply apparatus in any one of 1-3.

  (5) A raw water intake pump that feeds raw water before being heated to warm water of a predetermined temperature by the combined heat and power supply device to the purified water heat exchanger, and the internal power supply path is generated by the combined heat and power supply device. 5. The purified water supply apparatus having the combined heat and power supply apparatus according to the item 4, wherein electric power is also supplied to the raw water intake pump.

  (6) A power transmission path that is connected to a power receiving path for receiving power from the outside of the facility where the purified water supply apparatus is installed to the electrical equipment in the facility, and that supplies the power generated by the combined heat and power supply apparatus to the electrical equipment And a shutoff device that shuts off the power transmission path. 6. A purified water supply device having the combined heat and power supply device according to any one of 1 to 5 above.

  According to the purified water supply device having the combined heat and power device according to the preceding paragraph 1, the raw water supplied to the purified water device is heated by the heat generated by the combined heat and power device to improve the permeation rate of the reverse osmosis membrane, and the purification Since the electric power necessary for the operation of the water device is also secured from the combined heat and power supply device, purified water can be generated while reducing operating costs. In addition, since the purified water supply device can be operated independently as long as the fuel for operating the combined heat and power supply is secured, for example, in the event of a disaster, infrastructure such as electric power and drinking water, and other devices Purified water can be supplied without depending on the above.

  According to the purified water supply apparatus having the combined heat and power supply apparatus according to the preceding item 2, the temperature of the raw water supplied to the purified water apparatus is accurately controlled to an optimum temperature for the reverse osmosis membrane, and the purified water apparatus is efficiently operated. can do.

  According to the purified water supply apparatus having the combined heat and power supply apparatus according to the preceding item 3, it is possible to secure the electric power necessary for the operation of the raw water heating means from the combined heat and power supply apparatus, and to reduce the operating cost, and the purified water supply apparatus is highly independent. Sex can be secured.

  According to the purified water supply apparatus having the combined heat and power supply apparatus according to the preceding item 4, the purified water purified by the purified water apparatus is cooled by the raw water before heating, so that the purified water can be used for purposes other than hot water. Moreover, since raw | natural water is preheated simultaneously, the effective utilization of a thermal energy can be aimed at.

  According to the purified water supply apparatus having the combined heat and power supply apparatus according to the preceding item 5, it is possible to secure electric power necessary for the operation of the raw water intake pump from the combined heat and power supply apparatus and to reduce the operating cost, and the high purified water supply apparatus is high. Independence can also be ensured.

  According to the purified water supply apparatus having the combined heat and power supply apparatus according to the preceding item 6, surplus power that is not used in the purified water supply apparatus among the electric power generated by the combined heat and power supply apparatus is supplied to other electrical devices for efficient use. In the event of an emergency such as when a power failure occurs outside the facility, the purified water supply device can be separated from the power receiving path of the facility and operated independently and safely.

  Hereinafter, the purified water supply apparatus which has the cogeneration apparatus concerning this invention is demonstrated.

  FIG. 1 is an overall configuration diagram schematically showing a purified water supply device having a combined heat and power supply device according to the present invention.

  As shown in FIG. 1, a purified water supply device 11 having a combined heat and power supply device is provided in a facility 10 that receives power from the outside. The power receiving path 12 through which the facility 10 receives power from the outside can supply power to the purified water supply device 11 and other electric devices 19. The power receiving path 12 is provided with a shut-off device 13 that electrically disconnects the facility 10 from the outside in the event of a power outage or the like.

  The purified water supply device 11 includes a combined heat and power supply device 20, a purified water device 30, a raw water path 40, a raw water heating means 50, a clean water receiving path 60, and an internal power supply path 70.

  The cogeneration apparatus 20 generates heat and electric power at the same time. The combined heat and power supply device 20 includes a generator and a device configuration that can extract and use exhaust heat from the generator to the outside, and is generally called a cogeneration system. Examples of the generator include a gas engine, a gas turbine, a diesel engine, and a fuel cell.

  In this embodiment, a gas engine that receives supply of fuel such as medium-pressure natural gas from the outside of the facility 10 via the fuel supply path 21 is employed. The generated heat is taken out of the combined heat and power supply device 20 by a heat medium circulation path 22 arranged so that a heat medium made of an antifreeze such as ethylene glycol circulates inside and outside the device 20. And it is provided to the heating of the raw | natural water supplied to the purified water apparatus 30 with the heat exchanger 51 of the raw | natural water heating means 50 mentioned later.

  The generated power generated by the cogeneration apparatus 20 is sent to the generated power path 71 of the internal power supply path 70 and supplied to each device in the purified water supply apparatus 11. Further, auxiliary power necessary for operating the combined heat and power supply apparatus 20 itself is also supplied from the internal power distribution path 72 of the internal power supply path 70.

  The purified water device 30 purifies raw water such as domestic wastewater and groundwater supplied from the raw water path 40 to generate purified water.

  The raw water path 40 temporarily stores raw water obtained from a raw water source 41 such as a well or a drainage path in the raw water tank 42 and then supplies the raw water to the purified water device 30 via two heat exchangers 44 and 51 described later. It is configured.

  The purified water device 30 includes a reverse osmosis membrane 31 that removes impurities such as ions, organic substances, fine particles, and microbial particles contained in the raw water, and a pressure supply pump that supplies the reverse osmosis membrane 31 with pressurized raw water under pressure. 32. The driving power of the pressure supply pump 32 is supplied from the internal driving power distribution path 72 of the internal power supply path 70. As described above, since the driving power of the pressurized supply pump 32 is secured from the combined heat and power supply device 20 in the purified water supply device 11, the operation cost of the purified water supply device 11 as a whole can be suppressed.

  It is known that the reverse osmosis membrane 31 generally has higher permeation speed and higher purified water production efficiency than heated water at normal temperature (cold water) due to its characteristics. Specifically, for example, when a specific reverse osmosis membrane 31 is used, when the raw water is heated to about 38 ° C., the highest purification treatment efficiency is obtained.

  In this purified water supply device 11, the raw water is heated in advance so that the raw water supplied to the purified water device 30 reaches a predetermined temperature with the highest purification treatment efficiency in the purified water device 30 (reverse osmosis membrane 31). ing.

  The raw water heating means 50 heats the raw water in the raw water passage 40 to a predetermined temperature by the heat generated by the combined heat and power supply device 20. The raw water heating means 50 includes a heat exchanger 51, a heat medium circulation pump 52, a raw water temperature detector 53, and a heat medium circulation pump control means 54.

  The heat exchanger 51 heats the raw water in the raw water path 40 by the heat of the heat medium circulating in the heat medium circulation path 22 of the cogeneration apparatus 20. For example, heat exchange is performed between the heat medium at 80 ° C. sent from the cogeneration apparatus 20 and the raw water at 18 to 36 ° C. on the raw water path 40 to obtain a heat medium at 60 ° C. and heated raw water at 38 ° C.

  The heat medium circulation pump 52 feeds the heat medium to the heat exchanger 51 while adjusting the flow rate of the heat medium on the heat medium circulation path 22. The drive power for the heat medium circulation pump 52 is also supplied from the internal drive power distribution path 72 of the internal power supply path 70.

  The raw water temperature detector 53 is provided on the downstream side 55 of the heat exchanger 51 in the raw water path 40 and detects the temperature of the raw water heated in the heat exchanger 51.

  The heat medium circulation pump control means 54 is composed of a computer having a CPU and storage means such as a RAM and a ROM, and the temperature is the predetermined temperature according to the temperature of the raw water detected by the raw water temperature detector 53. The heat medium circulation pump 52 is inverter-controlled so that The drive power of the heat medium circulation pump control means 54 is also supplied from the internal drive power distribution path 72 of the internal power supply path 70.

  By such raw water heating means 50, raw water having a predetermined temperature with the highest purification treatment efficiency is always supplied to the purified water device 30, and purified water can be efficiently generated.

  The purified water thus generated by the purified water device 30 is purified hot water having a temperature similar to that of the raw water. The purified hot water generated by the purified water device 30 is sent to a hot water use facility such as a hot water shower in the facility 10 through the purified water path 33 and the purified hot water supply path 35 and used for various hot water applications.

  On the other hand, since the purified water generated by the purified water device 30 is also used as room temperature water such as drinking water, the purified water path 33 is provided with a flow rate switching valve 34 for branching the purified warm water supply path 35 described above. The purified water (purified hot water) other than that supplied to the purified hot water supply path 35 is sent to the purified water heat exchanger 44.

  The purified water heat exchanger 44 is provided on the raw water path 40 between the raw water tank 42 and the raw water heating means 50, and the raw water heating means 50 is provided by the raw water intake pump 43 provided on the raw water path 40. The raw water before being heated by is fed. The drive power of the raw water intake pump 43 is also supplied from the internal drive power distribution path 72 of the internal power supply path 70.

  The purified water heat exchanger 44 preheats the raw water before being heated by the raw water heating means 50 thus sent by the heat of the purified water (purified hot water) purified by the purified water device 30. In other words, according to the purified water heat exchanger 44, the purified hot water obtained from the purified water device 30 is cooled by the raw water in the raw water path 40. For example, heat exchange is performed between purified hot water of 38 ° C. sent from the purified water device 30 and raw water of 18 ° C. on the raw water path 40, and preheated to purified normal water cooled to a normal temperature of 20 ° C. and 18 to 36 ° C. Preheated raw water is obtained.

  Such purified water heat exchanger 44 preheats the raw water before being sent to the raw water heating means 50, so that the burden of raising the raw water to a predetermined temperature in the raw water heating means 50 can be reduced, and purification is performed. The thermal energy of hot water can be used effectively.

  Moreover, since the purified water (purified warm water) purified by the purified water device 30 is cooled to room temperature, the purified water can be used for purposes other than warm water.

  The purified water thus cooled to room temperature (purified room temperature water) is temporarily stored in the purified water tank 36, and the room temperature water (or cold water) such as potable water in the facility 10 is used via the purified room temperature water supply path 37. It is sent to the facility and used for various purposes.

  The purified water tank 36 can also store clean water (city water) that can be received from the outside of the facility 10 via the clean water receiving path 60. This clean water backs up the purified water device 30 to ensure the amount of water required in the facility 10. The water receiving path 60 is provided with a water receiving tank 61, and the water is temporarily stored in the water receiving tank 61 and then sent to the purified water tank 36, along with the purified water generated by the purified water device 30, and the facility 10 for various uses.

  The internal power supply path 70 takes in the power generated by the combined heat and power supply apparatus 20 from the generated power supply path 71 and distributes and supplies it to each part of the purified water supply apparatus 11 through the internal drive power distribution path 72. Specifically, in this internal power distribution path 72, the electric power generated by the combined heat and power supply apparatus 20 is the pressurized supply pump 32, the heat medium circulation pump 52, the heat medium circulation pump control means 54, and the raw water intake pump 43. The purified water supply device 11 is connected to all devices that require driving power.

  With such an internal power supply path 70, the purified water supply device 11 can secure other fuel for operating the combined heat and power supply device 20, other equipment inside and outside the facility 10, and infrastructure equipment such as electric power and water supply. For example, in the event of a disaster, purified water can be supplied. That is, the purified water supply device 11 can function as an emergency water source.

  The internal power distribution path 72 can also distribute power to an emergency power path 75 that supplies power to emergency equipment such as an emergency light in the facility 10. The emergency facilities connected to the emergency power path 75 are limited to those whose power consumption does not affect the drive of each part of the purified water supply device 11. By means of the emergency power path 75, the purified water supply device 11 can function as a minimum emergency power source in the event of a disaster or the like.

  The internal power supply path 70 has a power transmission path 73 connected to the power reception path 12 from which the facility 10 receives power from the outside. This power transmission path 73 supplies surplus power that is not used in the purified water supply device 11 among the power generated by the combined heat and power supply device 20 to the other electrical devices 19 in the facility 10. Conversely, when driving of the combined heat and power supply device 20 is stopped due to various circumstances such as inspection, it is possible to supply received power from the outside to the purified water supply device 11 through the power transmission path 73. is there.

  With such a power transmission path 73, it is possible to ensure redundancy in the power source of the purified water supply device 11 and achieve stable operation while efficiently using generated power by the combined heat and power supply device 20.

  Further, the power transmission path 74 is provided with a cutoff device 74 that can block only the power transmission path 74 without blocking the generated power supply path 71 and the internal drive power distribution path 72 in the purified water supply apparatus 11. ing.

  In the event of an emergency such as when the outside of the facility 10 is interrupted by such a shut-off device 74, the purified water supply device 11 is shut off from the power receiving path 12 of the facility 10 so that the purified water supply device 11 is connected to the outside of the facility 10 It can be separated from the electrical devices 19 and so on, and can be operated independently and safely.

  Note that, in the event of an emergency where the outside of the facility 10 is out of power, not only the interruption device 74 of the power transmission path 73 but also the power reception path 12 of the facility 10 is disconnected from the outside by the interruption device 13, and both the interruption devices 13, 74 are blocked. It is desirable to provide a safety device that enables operation of the combined heat and power unit 20 only when

  As mentioned above, although this invention was demonstrated based on one Embodiment, this invention is not limited to the said embodiment, In the range of the summary, it can change suitably. Specifically, it can be changed as follows.

  (1) The pressurized supply pump 32 may be installed outside the purified water device 30.

  (2) The heat exchanger 51 may be incorporated inside the cogeneration apparatus 20.

  (3) Only a part of the raw water is heated by the heat of the combined heat and power supply device 20 and appropriately mixed with unheated raw water to obtain raw water at a predetermined temperature (heated raw water), which is sent to the purified water device 30. Good.

  (4) The temperature control of the raw water fed into the purified water device 30 may be performed by means other than the inverter control of the heat medium circulation pump 52.

  (5) The cogeneration apparatus 20 is not limited to the above-described medium pressure natural gas, and various fuels can be employed. Further, a predetermined amount of fuel may be stored in the purified water supply device 11.

  (6) In the above embodiment, the configuration is such that the generated power of the combined heat and power supply device 20 is distributed to the five devices in the purified water supply device 11. However, if there are other devices that are electrically driven in the device 11, It is desirable to distribute to all.

  (7) Even if all the driving power in the purified water supply device 11 is not covered by the combined heat and power supply device 20, it is only necessary to supply power to at least the pressurized supply pump 32.

  (8) In the above embodiment, the configuration in which the heat generated by the combined heat and power supply device 20 is used only for heating the raw water is shown. However, the surplus heat may be supplied to other equipment in the facility 10. Good.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram which shows typically the purified water supply apparatus which has a combined heat and power supply apparatus concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Facility 11 Purified water supply apparatus 12 Power receiving path 19 In-facility electrical equipment 20 Thermoelectric supply apparatus 30 Purified water apparatus 31 Reverse osmosis membrane 32 Pressurized supply pump 40 Raw water path 43 Raw water intake pump 44 Purified water heat exchanger 50 Raw water heating means Reference Signs List 51 heat exchanger 52 heat medium circulation pump 53 raw water temperature detector 54 heat medium circulation pump control means 70 internal power supply path 73 power transmission path 74 cutoff device

Claims (6)

A purified water device having a reverse osmosis membrane;
A raw water path for supplying raw water to the purified water device;
A pressure supply pump that pressurizes and supplies the raw water of the raw water path to the reverse osmosis membrane;
A combined heat and power device that simultaneously generates heat and power;
Raw water heating means for heating raw water in the raw water path to warm water of a predetermined temperature by heat generated by the combined heat and power supply device,
An internal power supply path for supplying power generated by the cogeneration device to the pressure supply pump;
A purified water supply device having a combined heat and power supply device. The raw water heating means
A heat exchanger that heats raw water in the raw water path by heat of a heat medium circulating in the combined heat and power supply device;
A heat medium circulation pump for sending the heat medium to the heat exchanger;
Raw water temperature detector for detecting the temperature of raw water heated in the heat exchanger;
A heat medium circulation pump control means for driving and controlling the heat medium circulation pump so that the temperature becomes the predetermined temperature according to the temperature of the raw water;
The purified water supply apparatus which has a combined heat and power supply apparatus of Claim 1 characterized by the above-mentioned.   3. The thermoelectric power supply according to claim 2, wherein the internal power supply path is configured to supply the power generated by the combined heat and power supply device to the heat medium circulation pump and the heat medium circulation pump control unit. A purified water supply device having a co-feeding device.   2. A purified water heat exchanger for preheating raw water before being heated to warm water of a predetermined temperature by the combined heat and power device by heat of purified water purified by the purified water device. A purified water supply device comprising the combined heat and power supply device according to claim 3. A raw water intake pump that feeds raw water before being heated to warm water at a predetermined temperature by the combined heat and power supply device to the purified water heat exchanger,
5. The purified water supply device having a combined heat and power device according to claim 4, wherein the internal power supply path is configured to supply the power generated by the combined heat and power supply device to the raw water intake pump. . A power transmission path that is connected to a power receiving path that receives power from the outside of the facility where the purified water supply apparatus is installed to the electrical equipment in the facility, and that supplies the power generated by the cogeneration device;
A blocking device for blocking the power transmission path;
The purified water supply apparatus which has a combined heat and power supply apparatus in any one of Claims 1-5 characterized by the above-mentioned.

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