JP2013036641A - Water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow heat recovery from cooled fluid with simple structure while preventing breakage of a membrane, in a water supply system using a membrane type deaeration apparatus.SOLUTION: A first water supply path 14 is opened from the membrane type deaeration system 8 to a water supply tank 3. The first water supply passage 14 is not provided with a valve for cutting off a flow in a forward direction from a deaeration apparatus 8 to the water supply tank 3. A second water supply path 15 is branched from the first water supply passage 14 to supply water to the water supply tank 3 through a heat exchanger 18 with the cooled fluid. A water level sensor 13 monitors a water level of the water supply tank 3. When the water is supplied from the deaeration apparatus 8 to the water supply tank 3 based on a detection signal of the water level sensor 13, the water can be supplied through a second water supply path 15.

Description

  The present invention relates to a water supply system that aims to cool a fluid to be cooled with water supplied to a water supply tank and to heat the water supplied to the water supply tank with heat from the fluid to be cooled.

  As disclosed in Patent Document 1 below, water supplied to a boiler water supply tank (7) is used to cool compressed air and compressor lubricating oil, thereby adding water to the water supply tank. Systems for recovering compression heat by increasing the temperature are known. Specifically, water from the deaeration device (11) is first stored in a makeup water tank (21), and the water is supplied to a boiler water tank (31) via an air cooler (32) and an oil cooler (31). 7). The air cooler (32) cools the compressed air, while the oil cooler (31) cools the lubricating oil of the compressor, and the water supplied to the water supply tank is heated in each cooler.

Japanese Patent Laying-Open No. 2010-38385 (FIG. 1, paragraph numbers 0015-0016, 0057)

  When a membrane type deaerator is used as the deaerator, it is desirable not to provide a valve (for example, a ball tap / constant water level valve) for blocking forward flow on the secondary side of the deaerator. This is because closing the valve may apply a back pressure higher than the specified pressure on the deaeration membrane of the deaeration device, possibly damaging the deaeration membrane. Therefore, when using a membrane type deaeration device, the water from the deaeration device is once opened in a make-up water tank and used as in the invention described in Patent Document 1. .

  However, such a configuration requires a supplementary water tank in addition to the water supply tank. In addition, water supply from the makeup water tank to the water supply tank may be insufficient only by water supply through the heat recovery air cooler or oil cooler, and a configuration (first water supply channel 27) is required to cope with this. Become.

  By the way, there are also water treatment devices other than the deaeration device (for example, soft water devices) using a membrane, and even in a water supply system using such a membrane type water treatment device, The same can be said.

  Therefore, the problem to be solved by the present invention is to enable heat recovery from a fluid to be cooled with a simple configuration while preventing damage to the membrane in a water supply system using a membrane-type water treatment device. is there.

  The present invention has been made in order to solve the above-mentioned problems, and the invention according to claim 1 is directed to a forward direction from the water treatment device to the water supply tank that is opened from the membrane water treatment device to the water supply tank. A first water supply path that is not provided with a valve that shuts off the flow of water, and a second water supply path that is branched from the first water supply path and that supplies water to the water supply tank via a heat exchanger with a fluid to be cooled. A water level sensor for monitoring the water level of the water supply tank, and when water is supplied from the water treatment device to the water supply tank based on a detection signal of the water level sensor, water can be supplied through the second water supply channel. It is a water supply system characterized by.

  According to invention of Claim 1, the valve which interrupts | blocks a forward flow is not provided in the 1st water supply path from a membrane type water treatment apparatus to a water supply tank. Thereby, the back pressure is not applied to the membrane of the water treatment device, and the membrane can be prevented from being damaged. Further, a second water supply path is provided by branching from the first water supply path, and cooling of the fluid to be cooled and heating of the water supply can be achieved in the heat exchanger of the second water supply path.

  According to a second aspect of the present invention, the water treatment device is a membrane type deaeration device, and the second water supply path is provided with a water pump and the heat exchanger, and is based on a detection signal of the water level sensor. 2. The water supply system according to claim 1, wherein when the water supply valve of the membrane deaerator is opened to supply water to the water supply tank, the water supply pump is operated to supply water to the second water supply passage. It is.

  According to invention of Claim 2, protection of the film | membrane of a membrane type deaeration apparatus can be aimed at. In addition, when supplying water to the water supply tank, the water supply pump is operated to pass water through the second water supply channel, thereby cooling the cooled fluid and heating the water supply in the heat exchanger of the second water supply channel. be able to.

  According to a third aspect of the present invention, the second water supply passage is provided with a temperature sensor on the outlet side of the heat exchanger, and the flow rate of the second water supply passage is adjusted based on the temperature detected by the temperature sensor. The adjustment of the water flow rate is performed by adjusting the rotation speed of the water flow pump with an inverter or by providing a water flow valve in the second water supply channel and adjusting the opening degree thereof. 2. The water supply system according to 2.

  According to the third aspect of the present invention, hot water at a desired temperature can be obtained by adjusting the amount of water flow through the heat exchanger based on the temperature detected by the temperature sensor.

  Further, the invention according to claim 4 is that the heat exchanger is one or both of an oil cooler for cooling the lubricating oil of the compressor and an air cooler for cooling the compressed air from the compressor. It is a water supply system of Claim 3 characterized by the above-mentioned.

  According to the fourth aspect of the present invention, the compressor and the compressed air are cooled by supplying water to the water supply tank, while the water supplied to the water supply tank is heated by the compression heat to recover the compression heat. it can.

  ADVANTAGE OF THE INVENTION According to this invention, in the water supply system using a membrane-type water treatment apparatus, heat recovery from a to-be-cooled fluid is attained with a simple structure, preventing damage to a membrane.

It is the schematic which shows one Example of the water supply system of this invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic view showing an embodiment of the water supply system of the present invention. The water supply system 1 of the present embodiment uses water supplied to the water supply tank 3 of the boiler 2 (hereinafter, this water supply is referred to as boiler water supply) to cool the compressed air and the lubricating oil of the compressor 4. This is a system for recovering the compression heat by heating the boiler feed water.

  The compressor 4 is not particularly limited in its configuration, but is an oil-lubricated and water-cooled electric air compressor in this embodiment. In this case, the compressed air discharged from the compressor body (not shown) is sent to an oil separator (not shown), and the lubricating oil is separated and removed in the oil separator. The compressed air from which the lubricating oil has been removed by the oil separator is sent to various types of compressed air using devices (not shown) via an air cooler or a dryer (not shown) if desired. On the other hand, the lubricating oil separated by the oil separator is returned to the compressor body through the oil cooler.

  An air cooler is a heat exchanger between compressed air and its cooling water. On the other hand, the oil cooler is a heat exchanger for lubricating oil and its cooling water. Usually, the cooling water passed through the air cooler and the oil cooler is circulated between the cooling tower and the cooling water. Therefore, in this embodiment, the existing air cooler (hereinafter referred to as the first air cooler) and the oil cooler (hereinafter referred to as the first oil cooler) that circulates the cooling water with the cooling tower are left as they are. A heat exchanger for heat recovery is added upstream of the cooler, and the compression heat is recovered with boiler feed water.

  That is, the second air cooler 5 is provided in the air supply path from the oil separator to the first air cooler (not shown). In the second air cooler 5, the compressed air and the boiler feed water are heat-exchanged to cool the compressed air. The boiler water supply is heated. Similarly, a second oil cooler 6 is provided in the oil feed path from the oil separator to the first oil cooler (not shown). In this second oil cooler 6, the lubricating oil and boiler feed water are heat-exchanged to lubricate. Cooling oil and heating boiler feed water.

  Next, a water supply system to the water supply tank 3 of the boiler 2 will be described. The water supply system 1 of the present embodiment includes a soft water device 7, a deaeration device 8, and a water supply tank 3.

  The soft water device 7 is a device that removes hardness components such as calcium and magnesium contained in the raw water using an ion exchange resin or the like.

  The deaeration device 8 is a membrane type deaeration device in this embodiment, and more specifically, a device that removes oxygen in water using a deaeration membrane such as a hollow fiber membrane. The deaeration device 8 includes a water supply valve 9 on the inlet side, and when the water supply valve 9 is opened, the soft water from the soft water device 7 passes through the deaeration membrane 10. Thereby, the deaerated soft water can be taken out from the deaerator 8.

  The water supply tank 3 stores water from the deaeration device 8. The water in the water supply tank 3 is appropriately supplied to the boiler 2 through the water supply pump 11 and the check valve 12, and is heated and vaporized in the boiler 2.

  A water level sensor 13 is provided in the water supply tank 3. The water level sensor 13 is not particularly limited in its configuration. For example, the water level sensor 13 can obtain an output proportional to the water level in addition to an electrode-type water level detector that grasps the presence or absence of a predetermined water level depending on whether or not current flows through the electrode. A capacitance type water level detector or the like can be used. In any case, the water level sensor 13 monitors the water level in the water supply tank 3, and when the water level falls below the lower limit water level, the water supply valve 9 is opened to supply water, while when it exceeds the upper limit water level, the water supply valve 9 is closed to stop water supply. Thereby, the water level in the water supply tank 3 can be maintained in a desired range.

  Water from the deaeration device 8 is supplied to the water supply tank 3 through the first water supply path 14. The first water supply path 14 is not provided with a valve (for example, a ball tap or a constant water level valve) that interrupts the forward flow from the deaerator 8 to the water supply tank 3. Open to. If the above-described valve is provided in the first water supply channel 14, the valve is closed, and a back pressure exceeding a specified value is applied to the deaeration membrane 10 of the deaeration device 8, and the deaeration membrane 10 is damaged. There is a fear. However, if the first water supply path 14 from the degassing device 8 is opened to the water supply tank 3 as it is as in the present embodiment, there is no possibility that back pressure is applied to the degassing film 10, and the degassing film 10 is It can be surely protected. The first water supply path 14 may be provided with a check valve for preventing a back flow from the water supply tank 3 side.

  A second water supply path 15 is branched from the first water supply path 14, and water from the deaeration device 8 can be supplied to the water supply tank 3 through the second water supply path 15. In the present embodiment, the second water supply path 15 is provided with a water flow pump 16, a water flow valve 17, and a heat recovery heat exchanger 18 in order from the upstream side.

  In this embodiment, the heat recovery heat exchanger 18 is the second air cooler 5 and the second oil cooler 6 described above. In the present embodiment, the second water cooler 5 and the second oil cooler 6 are provided in this order in the second water supply passage 15, but the installation order may be reversed depending on the case. In the present embodiment, the second air cooler 5 and the second oil cooler 6 are provided in series in the second water supply path 15, but may be provided in parallel in some cases.

  Next, operation | movement of the water supply system 1 of a present Example is demonstrated. When the water level sensor 13 detects a low water level, the signal is sent to the deaerator 8, the water pump 16 and the water valve 17. As a result, the deaeration device 8 is activated and the water supply valve 9 is opened. On the other hand, the water pump 16 is operated and the water valve 17 is opened in conjunction with this operation. However, the water pump 16 also receives a control signal from the compressor 4 in this embodiment, and operates when the compressor 4 is in operation or is in operation. That is, as a result, the water flow to the second water supply path 15 is performed while the compressor 4 is in operation or at the start of operation. When the water pump 16 is operated, the water from the deaeration device 8 is prioritized to pass through the second water supply path 15 rather than the first water supply path 14 due to the suction force of the water pump 16.

  On the other hand, when the water level sensor 13 detects a high water level, the deaeration device 8 is stopped and the water supply valve 9 is closed, while the water pump 16 is stopped and the water valve 17 is closed so as to be interlocked therewith.

  By the way, a temperature sensor 19 is provided on the outlet side of the heat recovery heat exchanger 18 (second air cooler 5, second oil cooler 6) in the second water supply path 15, and based on the detected temperature of the temperature sensor 19. You may control by adjusting the opening degree of the water flow valve 17, and maintaining the water temperature supplied to the water supply tank 3 from the 2nd water supply path 15 as desired. In this case, depending on the amount of water flowing through the second water supply passage 15, there is a possibility that the compressed air and the lubricating oil cannot be cooled as desired by using only the second air cooler 5 and the second oil cooler 6. Since the first oil cooler is provided, the compressed air and the lubricating oil can be cooled as desired.

  Instead of adjusting the opening of the water flow valve 17 based on the temperature detected by the temperature sensor 19, the heat recovery is achieved by controlling the rotation speed of the water flow pump 16 using an inverter based on the temperature detected by the temperature sensor 19. The amount of water flow to the heat exchanger 18 may be adjusted. In this case, the installation of the water flow valve 17 can be omitted.

  In addition, since there is no possibility that the compressor 4 side is overcooled, if there is no restriction that the temperature heated through the second water supply passage 15 is kept at a predetermined level, the water flow valve 17 is adjusted only for the maximum flow rate. It is good.

The water supply system 1 of the present invention is not limited to the configuration of the above embodiment, and can be changed as appropriate.
For example, in the above-described embodiment, the first air cooler and the first oil cooler as the existing cooling means of the compressor 4 are left as they are, and the second air cooler 5 and the second oil cooler 6 as the heat recovery heat exchanger 18 are left as they are. Although installed in the second water supply path 15, one of the second air cooler 5 and the second oil cooler 6 may be omitted. That is, the number of heat recovery heat exchangers 18 provided in the second water supply path 15 can be changed as appropriate. Further, the installation of the second air cooler 5 and / or the second oil cooler 6 is omitted, and the first air cooler and / or the first oil cooler is installed in the second water supply passage 15 so that the first air cooler and the first oil cooler are installed. The cooling water may be boiler feed water.

  Moreover, in the said Example, although the compressor 4 was driven with the motor, you may drive with a steam engine. Furthermore, in the said Example, the compressor 4 may be a multistage and may be a non-lubricated type (oil-free type). In any case, a cooler 18 for cooling the compressed air or the lubricating oil may be installed in the second water supply passage 15 and the compression heat may be recovered by boiler supply water.

  Moreover, in the said Example, it was set as the system which collect | recovers the compression heat of the compressor 4 with the heat exchanger 18 installed in the 2nd water supply path 15, However, The heat source which preheats boiler water supply in the 2nd water supply path 15 is especially ask | required. Absent. For example, in the heat exchanger 18 installed in the 2nd water supply path 15, you may aim at heat exchange with the waste gas from various apparatuses, and boiler feed water.

  Moreover, in the said Example, although the example which prevents the back pressure concerning the deaeration membrane 10 of the membrane type deaeration apparatus 8 was demonstrated, not only the membrane type deaeration apparatus 8 but the other which uses the film | membrane with back pressure restriction | limiting It can be similarly applied to other water treatment apparatuses. For example, a membrane soft water device or a RO reverse osmosis membrane water purifier may be used. Even in that case, the first water supply path 14 from the membrane water treatment device is opened to the water supply tank 3 without using a valve for blocking the forward flow, thereby preventing back pressure from being applied to the membrane. However, based on the detection signal of the water level sensor 13, the water supply valve 9 to the membrane water treatment device, the water pump 16, and the like may be controlled.

  In the above-described embodiment, the example in which the water supply valve 17 is provided in the second water supply path 15 and the opening degree of the water supply valve 17 is adjusted based on the temperature detected by the temperature sensor 19 has been described. A setter may be provided, and the installation of the water flow valve 17 and the temperature sensor 19 may be omitted.

  Furthermore, in the said Example, although the water of the water supply tank 3 was used as water supply to the boiler 2, it is applicable also to uses other than boiler water supply, such as an air conditioner and a food machine.

DESCRIPTION OF SYMBOLS 1 Water supply system 2 Boiler 3 Water supply tank 4 Compressor 5 Second air cooler 6 Second oil cooler 7 Soft water device 8 Membrane type deaerator (membrane type water treatment device)
DESCRIPTION OF SYMBOLS 9 Water supply valve 10 Deaeration membrane 11 Water supply pump 12 Check valve 13 Water level sensor 14 1st water supply path 15 2nd water supply path 16 Water supply pump 17 Water supply valve 18 Heat exchanger 19 Temperature sensor

Claims (4)

A first water supply path that is opened from the membrane water treatment device to the water supply tank and is not provided with a valve for blocking a forward flow from the water treatment device to the water supply tank;
A second water supply path that is branched from the first water supply path and supplies water to the water supply tank via a heat exchanger with the fluid to be cooled;
A water level sensor for monitoring the water level of the water supply tank,
When supplying water from the water treatment device to the water supply tank based on a detection signal of the water level sensor, water supply is enabled through the second water supply channel. The water treatment device is a membrane deaeration device,
The second water supply path is provided with a water pump and the heat exchanger,
When the water supply valve of the membrane deaerator is opened to supply water to the water supply tank based on the detection signal of the water level sensor, the water supply pump is operated to supply water to the second water supply channel. The water supply system according to claim 1. In the second water supply channel, a temperature sensor is provided on the outlet side of the heat exchanger,
Based on the temperature detected by this temperature sensor, the water flow rate of the second water supply channel is adjusted,
The adjustment of the water flow rate is performed by adjusting the rotation speed of the water flow pump with an inverter or by providing a water flow valve in the second water supply path and adjusting the opening degree. The water supply system described. The water supply system according to claim 3, wherein the heat exchanger is one or both of an oil cooler that cools the lubricating oil of the compressor and an air cooler that cools the compressed air from the compressor. .

Images