JP5223526B2 - Boiler water supply system - Google Patents

Description

  The present invention relates to a water supply system for a boiler. Typically, the boiler can recover the compression heat of the compressor by using the water supplied to the water supply tank to increase the temperature of the water supplied to the boiler and cool the compressor compressed air and lubricating oil. It relates to the water supply system.

Patent Document 1 below discloses a steam system including a screw expander (1) that generates power using steam and an air compressor (2) driven by the screw expander (1). Yes.
JP-A-63-45403

  The compressor generates heat of compression during operation. In the case of an oil-lubricated compressor, if the temperature of the lubricating oil is too high, the viscosity of the lubricating oil decreases, causing film breakage or inconvenience for air to expand and compress. On the other hand, if the temperature of the lubricating oil is too low, the viscosity of the lubricating oil increases, and power is required to drive the compressor. Furthermore, in order to prevent the generation of drainage, the dew point of compressed air should not be reduced. Therefore, it is necessary to maintain the temperature of the lubricating oil as desired.

  In the case of a steam system including a screw type expander and an air compressor as in the invention disclosed in the patent application 1, it is assumed that a boiler is further provided for supplying steam to the screw type expander. The In that case, in order to cool the compressed air and lubricating oil of a compressor, using the feed water to a boiler is also considered. However, since water supply to the boiler is intermittently performed, there is a possibility that cooling of the compressed air and lubricating oil of the compressor cannot be effectively achieved only by using water supply to the boiler.

  Even if the stored water in the water supply tank, the compressed air of the compressor, and the lubricating oil are indirectly heat-exchanged through the heat exchanger, it is not possible to maintain the desired temperature of the compressed air and the lubricating oil. Can not. Moreover, when drainage from steam-utilizing equipment such as a screw expander is collected in the water supply tank to save energy, the water in the water supply tank rises in temperature, so the compressor compressed air and lubricating oil cooling water There is also a risk that the temperature may be unsuitable.

  An object of the present invention is to effectively cool a fluid to be cooled using water supplied to a water supply tank. Typically used with an oil-lubricated compressor, the drain of steam-utilizing equipment is collected in a feed water tank to raise the temperature of the feed water to the boiler, but the compressor water is supplied to the feed water tank. It is an object of the present invention to recover the compression heat and to raise the temperature of the feed water to the boiler and to cool the compressed air and lubricating oil of the compressor.

This invention was made in order to solve the said subject, and the invention of Claim 1 stores the feed water to a boiler, and the water supply tank by which the steam drain from a boiler is collect | recovered , and a setting range A replenishing water tank that is capable of replenishing water so that the water level is maintained and is capable of supplying water to the water supply tank via the first water supply path and the second water supply path, while preventing backflow from the water supply tank; A heat exchanger that is provided in the second water supply channel, through which water from the makeup water tank is passed, and through which a fluid to be cooled is passed through indirect heat exchange with the water, and this heat exchange It is a boiler water supply system provided with the heat supply water amount adjustment means which adjusts the amount of water supplied to the said heat exchanger from the said makeup water tank based on the temperature of the to-be-cooled fluid passed through a vessel.

  According to the first aspect of the present invention, it is possible to provide a makeup water tank separately from the water supply tank, and to cool the cooled fluid with the water in the makeup water tank. By providing a make-up water tank separately from the water supply tank, even if drain is collected in the water supply tank, the temperature of the water in the make-up water tank is not raised by that, and the cooled fluid is cooled with the water in the make-up water tank. Effectively. Further, the fluid to be cooled can be brought to a desired temperature by adjusting the amount of water supplied to the heat exchanger based on the temperature of the fluid to be cooled.

According to a second aspect of the present invention, water can be supplied from the make-up water tank to the water supply tank through the first water supply channel due to a water head pressure difference, while a check is not made from the water supply tank to the make-up water tank. The heat supply water amount adjusting means is a heat supply water pump whose rotation speed is controlled by an inverter based on the temperature of the fluid to be cooled that is passed through the heat exchanger. The boiler water supply system according to claim 1.

  According to the second aspect of the invention, the fluid to be cooled can be easily set to the desired temperature by performing inverter control of the heat exchange water pump based on the temperature of the fluid to be cooled that is passed through the heat exchanger. . Furthermore, when the amount of water in the water supply tank is insufficient only by water supply via the heat exchanger with the fluid to be cooled, water is automatically supplied to the water supply tank due to the water head pressure difference. By using the water head pressure difference to supply water from the make-up water tank to the water supply tank, the water level control is sufficient with only the make-up water tank.

  According to a third aspect of the present invention, water from the makeup water tank is passed through the heat exchanger, while lubricating oil and / or compressed air as the fluid to be cooled is passed from an oil lubricated compressor. 3. The boiler water supply system according to claim 1, wherein a water supply amount to the heat exchanger is adjusted by the heat exchange water supply amount adjusting means based on a temperature of lubricating oil or compressed air. is there.

  According to the third aspect of the present invention, it is used with an oil lubricated compressor to increase the temperature of the feed water to the boiler, and collect the compression heat of the compressor using the feed water to the feed water tank, It is possible to increase the temperature of feed water to the boiler and cool the compressed air and lubricating oil of the compressor. Moreover, the amount of water supplied to the heat exchanger can be adjusted in accordance with the load fluctuation of the compressor, and the compressed air or lubricating oil of the compressor can be maintained at a desired temperature.

  According to a fourth aspect of the present invention, the water after passing through the heat exchanger is supplied to the water supply tank through a drain recovery path to the water supply tank. It is a boiler water supply system given in any 1 paragraph.

  When hot drain is collected directly in the water supply tank, steam is blown up. Accordingly, the heat recovery rate is lowered by that amount. In contrast, according to the fourth aspect of the present invention, water from the heat exchanger is mixed in the middle of the drain recovery path. Thereby, the amount of steam escaping into the atmosphere is reduced, and as a result, the heat recovery rate can be improved. In addition, since the drain recovery path from the steam-utilizing device to the water supply tank and the water supply path from the heat exchanger to the water supply tank are shared at least in part, the configuration is simplified and the cost is reduced. You can plan.

  According to a fifth aspect of the present invention, soft water can be supplied to the makeup water tank via a deoxygenation device, and the deoxygenation device includes a degassing module configured by a hollow fiber membrane, and the replenishment water tank The water level in the makeup water tank is maintained within a set range by switching the water supply to the deaeration module based on the water level in the water tank. It is a boiler water supply system of description.

  According to the invention described in claim 5, the water from the deaeration module using the hollow fiber membrane is always once released into the make-up water tank. Thereby, it can prevent that the pressure exceeding the pressure resistance arises in a deaeration module.

  According to a sixth aspect of the present invention, the water supply tank and the makeup water tank are configured as one common tank, and the common tank stores water supplied to the boiler and collects steam drain from the boiler. In addition, water from the water softener using ion exchange resin can be supplied to the common tank via a replenishing water valve, and can be supplied to the common tank via a heat supply water pump and the heat exchanger. The water level in the common tank is maintained in a set range by controlling the makeup water valve based on the water level in the common tank. Boiler water supply system.

  According to the sixth aspect of the present invention, the water supply tank and the makeup water tank are unified and configured as one common tank. Thereby, simplification of a structure can be achieved.

  Further, in the invention according to claim 7, the heat exchange water amount adjusting means is an electric valve whose opening degree is adjusted based on a temperature of a fluid to be cooled that is passed through the heat exchanger. The boiler water supply system according to claim 6, wherein the boiler water supply system is provided instead of the heat exchange water supply pump.

  According to the seventh aspect of the invention, instead of performing inverter control on the heat exchange water supply pump, it is only necessary to adjust the opening degree of the motor-operated valve. The water supply can be controlled.

  According to the boiler water supply system of the present invention, it is possible to effectively cool the fluid to be cooled using the water supplied to the water supply tank. For example, when used with an oil-lubricated compressor, the drainage from steam-utilizing equipment is collected in a water supply tank to increase the temperature of the water supply to the boiler, while the compressor heat is supplied using the water supplied to the water supply tank. It can collect | recover and it can aim at temperature rise of the feed water to a boiler, and cooling of the compressed air and lubricating oil of a compressor.

  Hereinafter, the boiler water supply system of this invention is demonstrated in detail based on an Example.

  FIG. 1 is a schematic diagram illustrating an example of a steam system including the boiler water supply system according to the first embodiment of the present invention. In the steam system 1, the present invention is applied to a water supply system to the boiler 2. Therefore, first, the outline of the steam system 1 will be described, and then the boiler water supply system 3 of this embodiment which is a water supply system to the boiler 2 will be described.

  A steam system 1 shown in FIG. 1 includes a boiler 2, a steam motor 4 that generates power using steam from the boiler 2, and a compressor 5 that is driven by the steam motor 4. The steam motor 4 and the compressor 5 may be configured as one unit 6 as indicated by a two-dot chain line in FIG.

  If the boiler 2 is a steam boiler, the structure in particular will not be ask | required. Water is supplied to the boiler 2 from the water supply tank 7. Since the water supply system to the boiler 2 includes the soft water device 10 and the deoxygenation device 11, the degassed soft water is supplied to the boiler 2. The water supplied to the boiler 2 is vaporized by the boiler 2. The steam from the boiler 2 is supplied to the first steam header 12, and the steam in the first steam header 12 is supplied to one or a plurality of various steam utilization devices 13.

  As one of the steam utilization devices 13 of this type, there is a steam motor 4. Steam is supplied from the first steam header 12 to the steam motor 4 via the steam supply path 14. A steam supply valve 15 is provided in the steam supply path 14 from the first steam header 12 to the steam motor 4. By adjusting the opening / closing or opening degree of the steam supply valve 15, the presence / absence or output of the steam motor 4 can be adjusted.

  The steam motor 4 is a device that obtains a rotational driving force by the supplied steam. In the steam motor 4, the steam is expanded and decompressed. Therefore, the steam motor 4 functions not only as a drive source for the compressor 5 but also as a pressure reducing valve. Thereby, the steam after being used in the steam motor 4 can be used as it is in various steam utilizing devices (not shown) as the steam after passing through the pressure reducing valve. For this purpose, the steam after use in the steam motor 4 is supplied to the second steam header 17 via the exhaust steam passage 16, and the steam in the second steam header 17 is sent to one or a plurality of various steam utilizing devices. Supplied. The exhaust steam passage 16 is provided with a check valve 18 that prevents the backflow of steam to the steam motor 4.

  The first steam header 12 and the second steam header 17 are also connected via the bypass path 19. Specifically, a steam supply path 14 from the first steam header 12 to the steam supply valve 15 and a steam exhaust path 16 from the check valve 18 to the second steam header 17 are connected by a bypass path 19. The bypass passage 19 is provided with a bypass valve 20. The bypass valve 20 is preferably a self-powered pressure reducing valve, and its opening degree is mechanically adjusted by itself so as to maintain the steam pressure in the second steam header 17 at a predetermined level. If such a bypass path 19 is provided, the steam can be stably supplied to the steam utilization device of the second steam header 17. For example, even when the steam supply valve 15 is closed and the steam motor 4 is stopped, the steam can be supplied to the steam using device of the second steam header 17.

  The steam motor 4 is preferably a screw-type steam motor. A screw-type steam motor is a device in which steam is introduced between screw rotors that mesh with each other, and the steam is expanded and decompressed while rotating the screw rotor by the steam, and power is obtained by rotation of the screw rotor at that time.

  The compressor 5 is not particularly limited as long as it is oil-lubricated, but is a screw-type air compressor here. A screw compressor is a device that sucks gas between screw rotors that mesh with each other and rotate, and compresses and discharges the gas by rotation of the screw rotor. In this case, lubricating oil is present in the casing in order to lubricate the screw rotors that rotate in mesh with each other in the casing and to form a space for generating compressed air. This lubricating oil also serves to cool the compression heat generated in the compressor 5 by being water-cooled to a desired temperature. Since the lubricating oil is cooled with water and maintained at a desired temperature, the disadvantage that the air to be compressed expands is also avoided. Usually, not only the lubricating oil but also the compressed air obtained is water-cooled.

  The compressor 5 is driven by the steam motor 4. Specifically, the screw rotor of the screw compressor is rotated using the rotational driving force of the screw rotor of the screw steam motor. As described above, the compressor 5 is basically driven by the steam motor 4, but may be auxiliary driven by an electric motor (not shown).

  Next, the boiler water supply system 3 will be described. The boiler water supply system 3 of the present embodiment includes a water supply tank 7 that stores water supplied to the boiler 2, a replenishment water tank 21 that stores water supplied to the water supply tank 7, and the supply water tank 21 to the water supply tank 7. The heat exchanger 22 which cools the compressor 5 using water supply is provided as a main part. The heat exchanger 22 is usually configured as a part of the unit 6 (more specifically, a part of the compressor 5), as indicated by a two-dot chain line in FIG.

  The water supply tank 7 stores water supplied to the boiler 2 and collects drain from the steam utilization device 13 and the like. In FIG. 1, the drain from the steam using device 13 (including the steam motor 4) of the first steam header 12 and the steam using device (not shown) of the second steam header 17 passes through the drain recovery path 23. It is collected in the water supply tank 7. The water in the water supply tank 7 can be supplied to the boiler 2.

  The make-up water tank 21 stores water supplied to the water supply tank 7 and can supply water from the make-up water channel 24 via the soft water device 10 and the deoxygenation device 11. The soft water device 10 is a device that removes hardness components such as calcium ions and magnesium ions contained in the raw water using an ion exchange resin in this embodiment. Specifically, a resin cylinder (not shown) filled with an ion exchange resin is provided, and raw water is passed through the resin cylinder to remove hardness components such as calcium ions and magnesium ions contained in the raw water. Device.

  On the other hand, the deoxygenation device 11 is a device that removes oxygen in water using a hollow fiber membrane in this embodiment. Specifically, an apparatus for removing oxygen in water by providing a degassing module (not shown) constituted by a hollow fiber membrane, allowing water to pass through one of the membrane inside and outside, and the other to be in a vacuum state It is.

  The raw water is supplied to the makeup water tank 21 as degassed soft water through the soft water device 10 and the deoxygenation device 11. By controlling the deoxygenation device 11, the presence or absence of water supply to the makeup water tank 21 is switched. Specifically, by opening and closing a solenoid valve (not shown) provided at the inlet of the deoxygenation device 11, the presence or absence of water supply to the deaeration module is switched to switch the presence or absence of water supply to the makeup water tank 21. . At this time, the electromagnetic valves may be provided in parallel so that the flow rate can be adjusted by opening one or both of them. In order to prevent oxygen from being dissolved again when the degassed soft water comes into contact with air, beads 25, 25,... Are floated over the water surfaces of the water supply tank and the makeup water tank.

  A water level detector 26 is provided in the makeup water tank 21. By controlling the deoxidizer 11 based on the detection signal from the water level detector 26, the water level in the makeup water tank 21 is maintained within the set range. The configuration of the water level detector 26 is not particularly limited. In the present embodiment, the water level detector 26 is a capacitance type water level detector that can obtain an output proportional to the water level. When the water in the makeup water tank 21 falls below the lower limit water level, water is supplied from the deoxygenation device 11, while when the water in the makeup water tank 21 exceeds the upper limit water level, the water supply from the deoxygenation device 11 is stopped.

  In addition, when the flow rate at the time of water supply from the deoxygenation device 11 can be changed as described above, water may be supplied at a high flow rate up to a specific water level, and thereafter at a low flow rate. Also, if the water level drops below a predetermined water level set below the lower limit water level, an alarm is issued as a low water level, whereas if it rises above a predetermined water level set above the upper limit water level, an alarm is issued as a high water level. Is preferred.

  The water in the makeup water tank 21 can be supplied to the water supply tank 7 via the first water supply path 27 and the second water supply path 28. First, water supply through the first water supply path 27 will be described. The makeup water tank 21 and the water supply tank 7 are connected via a first water supply path 27 provided with a check valve 29. The check valve 29 of the first water supply passage 27 allows water supply from the makeup water tank 21 to the water supply tank 7, but prevents backflow from the water supply tank 7 to the makeup water tank 21. Water supply from the replenishing water tank 21 to the water supply tank 7 via the first water supply path 27 is performed by a head pressure difference between the replenishing water tank 21 and the water supply tank 7. On the other hand, the water in the water supply tank 7 is prevented from flowing back into the makeup water tank 21 by a check valve 29 provided in the first water supply path 27.

  Next, water supply through the second water supply path 28 will be described. The make-up water tank 21 and the water supply tank 7 are connected via a second water supply path 28 provided with a heat exchange water supply pump 30 and a heat exchanger 22 in this order. The heat exchanger 22 is supplied with water from the makeup water tank 21 and is supplied with a fluid to be cooled to be cooled by indirect heat exchange with the water. In this embodiment, the fluid to be cooled is the lubricating oil and compressed air of the oil-lubricated air compressor 5. Therefore, the heat exchanger 22 of the present embodiment includes an oil cooling unit 31 and an air cooling unit 32.

  The water in the makeup water tank 21 is passed through the air cooling section 32 and the oil cooling section 31 of the heat exchanger 22 provided in the middle of the second water supply path 28 in order, and is supplied to the water supply tank 7. The oil cooling section 31 of the heat exchanger 22 is supplied with water from the make-up water tank 21 to the water supply tank 7, while the lubricating oil of the compressor 5 is passed through for indirect heat exchange with this water for cooling. Is done. Specifically, the oil cooling unit 31 of the heat exchanger 22 is supplied with lubricating oil from the compressor 5 through the oil supply passage 33, and the lubricating oil is returned to the compressor 5 through the oil discharge passage 34. In this way, the lubricating oil is circulated between the compressor 5 and the heat exchanger 22. At this time, the circulation of the lubricating oil is naturally performed by an internal pressure of an oil separator (not shown) of the compressor 5, but may be forcibly performed by providing a circulation pump in the oil supply passage 33 in some cases. Incidentally, a temperature sensor 35 is provided in the oil supply passage 33 from the compressor 5 to the heat exchanger 22.

  On the other hand, the air cooling unit 32 of the heat exchanger 22 is supplied with water from the makeup water tank 21 to the water supply tank 7, while being compressed by the compressor 5 in order to exchange heat with this water for cooling. Air is passed. Specifically, the air cooling unit 32 of the heat exchanger 22 is supplied with compressed air from the compressor 5 via an air supply path 36, and the air is supplied via an exhaust path 37 to an air dryer (not shown). The In this way, the compressed air from the compressor 5 is cooled by the heat exchanger 22, moisture is removed by the air dryer, and sent to various types of compressed air utilization equipment (not shown).

  The amount of water supplied from the make-up water tank 21 to the heat exchanger 22 is also the amount of water supplied from the make-up water tank 21 to the water supply tank 7 via the second water supply passage 28. This water supply amount is the heat exchange water amount adjusting means. It can be changed by an inverter pump. Specifically, the heat exchange water pump 30 provided in the second water supply path 28 from the makeup water tank 21 to the heat exchanger 22 is capable of controlling the rotation speed by the inverter 38, and the rotation speed is changed. Thus, the amount of water supplied to the heat exchanger 22 is adjusted.

  The amount of water supplied from the makeup water tank 21 to the heat exchanger 22 is adjusted based on the temperature of the fluid to be cooled that is passed through the heat exchanger 22. In the present embodiment, the rotation number of the heat exchange water pump 30 is controlled by the inverter 38 based on the liquid temperature of the lubricating oil passed through the heat exchanger 22. Specifically, the heat supply water pump 30 is controlled by the inverter 38 based on the temperature detected by the temperature sensor 35 so that the lubricating oil supplied from the compressor 5 to the heat exchanger 22 is maintained at a set temperature. The amount of water supplied from the makeup water tank 21 to the heat exchanger 22 is adjusted.

  By the way, the water supply tank 7 and the make-up water tank 21 are provided with overflow paths 39 and 39 for allowing more than a predetermined amount of water to overflow to the outside.

  According to the boiler water supply system 3 of the present embodiment, water is supplied to the make-up water tank 21 through the soft water device 10 and the deoxygenation device 11 according to the water level. Thereby, the water level of the makeup water tank 21 is maintained in the set range. Then, the water in the makeup water tank 21 can be supplied to the water supply tank 7 via the first water supply path 27 and the second water supply path 28.

  In the heat exchanger 22 provided in the second water supply path 28, the lubricating oil and the compressed air of the compressor 5 are cooled by supplying water from the makeup water tank 21 to the water supply tank 7. At that time, the rotational speed of the heat exchange water pump 30 is controlled by the inverter 38 so as to maintain the lubricating oil at the set temperature, and the amount of water supplied to the heat exchanger 22 is adjusted. Thereby, according to the load fluctuation | variation of the compressor 5, the amount of cooling water can be adjusted. Similarly, the heat supply water pump 30 may be inverter-controlled based on the temperature of the compressed air from the compressor 5. For example, a temperature sensor may be provided in the exhaust passage 37 from the heat exchanger 22, and the heat exchange water pump 30 may be inverter-controlled based on the temperature detected by the temperature sensor. Such control based on the temperature of the compressed air may be performed in place of the control based on the temperature of the lubricating oil described above, or may be performed in addition to the control based on the temperature of the lubricating oil described above. In the latter case, two second water supply passages 28 are provided, and one second water supply passage 28 is piped to the water supply tank 7 via the first heat exchange water supply pump 30 and the oil cooling section 31, and the other second water supply passage 28 is provided. The water supply path 28 is piped to the water supply tank 7 via the second heat exchange water supply pump 30 and the air cooling unit 32. And the 1st heat exchange water pump 30 is controlled based on the temperature of lubricating oil, and the 2nd heat exchange water pump 30 is controlled based on the temperature of compressed air.

  By the way, there is a possibility that the water stored in the water supply tank 7 may be insufficient depending on the amount of water supplied to the heat exchanger 22 only by supplying water to the water supply tank 7 via the second water supply path 28. To the water supply tank 7 is automatically supplied through the first water supply passage 27 by the water head pressure difference. Moreover, the water level of the makeup water tank 21 is maintained within the set range, and drainage is also collected in the water supply tank 7. Accordingly, the water level of the water supply tank 7 is maintained at or above the water level of the makeup water tank 21. As described above, a desired water level can be secured in the water supply tank 7 only by performing the water level control only on the makeup water tank 21. Even if the water level of the water supply tank 7 becomes higher than that of the makeup water tank 21, the water in the water supply tank 7 does not flow into the makeup water tank 21 by the check valve 29 provided in the second water supply path 28.

  In the case of the configuration of the present embodiment, only the relatively low temperature raw water is supplied to the makeup water tank 21. That is, since the drain and the water after passing through the heat exchanger 22 are supplied not to the makeup water tank 21 but to the feed water tank 7, the water temperature of the makeup water tank 21 is not increased. By using such relatively low-temperature water as cooling water for the fluid to be cooled in the heat exchanger 22, the amount of cooling water can be minimized. Further, even when the drain recovery rate is relatively high, the waste heat of the compressor 5 can be effectively recovered with the makeup water supplied to the water supply tank 7.

  In addition, despite the provision of the two tanks, the water supply tank 7 and the makeup water tank 21, the water level control is only required on the makeup water tank 21 side, and the water level control is easy. Moreover, since the water supply from the replenishing water tank 21 to the water supply tank 7 via the first water supply path 27 is performed using the water head pressure difference, the second water supply path 28 does not require a pump for water supply.

  FIG. 2 is a schematic diagram illustrating an example of a steam system 1 including the second embodiment of the boiler water supply system 3 of the present invention. The boiler water supply system 3 of the second embodiment and the steam system 1 including the same are basically the same as those of the first embodiment. Therefore, in the following description, the differences between the two will be mainly described, and corresponding portions will be described with the same reference numerals.

  The second embodiment is configured as one common tank 40 by unifying the water supply tank 7 and the makeup water tank 21 in the first embodiment. Since the water supply tank 7 and the makeup water tank 21 are unified, the first water supply path 27 and the check valve 29 in the first embodiment are omitted. On the other hand, in the second embodiment, the second water supply passage 28 branches from the middle of the replenishment water passage 24 from the soft water device 10 to the common tank 40, and is connected to the common tank via the heat exchange water supply pump 30 and the heat exchanger 22. 40 is piped.

  Hereinafter, the boiler water supply system 3 of the second embodiment will be described more specifically. In the second embodiment, the common tank 40 stores water supplied to the boiler 2, and drain is supplied from the steam utilization device 13 or the like via the drain recovery path 23. The water in the common tank 40 can be supplied to the boiler 2.

  The common tank 40 can supply water from the water softening device 10 via the replenishment water channel 24. Water supply to the common tank 40 is controlled by a supply water valve 41 provided in the supply water channel 24. In this embodiment, the replenishing water valve 41 is composed of an electromagnetic valve, and the presence or absence of water supply to the common tank 40 is switched by controlling the opening and closing.

  A second water supply path 28 is branched from the supply water path 24 from the water softener 10 to the supply water valve 41. The second water supply path 28 supplies water from the water softener 10 to the common tank 40. In the middle of the second water supply path 28, the heat exchange water supply pump 30 and the heat exchanger 22 are provided as in the first embodiment. In this way, the water from the soft water device 10 can be supplied to the common tank 40 via the replenishing water channel 24 having the replenishing water valve 41, while the heat exchange water pump 30 and the heat exchanger 22 are provided. The common tank 40 can be supplied through the two water supply channels 28.

  As in the first embodiment, the heat supply water pump 30 is controlled by the inverter 38 based on the temperature of the lubricating oil circulated to the heat exchanger 22. The common tank 40 is provided with a water level detector 26 as in the first embodiment. By controlling the opening and closing of the replenishing water valve 41 based on the detection signal from the water level detector 26, the water level in the common tank 40 is maintained within the set range.

  By the way, in the case of the present Example 2, even if the water supply valve (illustration omitted) to the water softener 10 is always open, the water supply to the common tank 40 is controlled by the replenishment water valve 41 and the heat exchange water supply pump 30. be able to. Even if such control is performed, if the deoxygenation device 11 using the hollow fiber membrane as described in Example 1 is not installed, the degassing module can be configured without worrying about the pressure resistance. it can.

  In the case of the present Example 2, since the water supply tank 7 and the makeup water tank 21 are unified and comprised from the one common tank 40, a structure can be simplified. Even if the water supply tank 7 and the make-up water tank 21 are made common, the cooling water to the heat exchanger 22 is directly supplied from the soft water device 10 without going through the common tank 40. The fluid to be cooled can be efficiently cooled. Other configurations and effects are the same as those of the first embodiment, and thus description thereof is omitted.

  FIG. 3 is a schematic diagram illustrating an example of a steam system 1 including the third embodiment of the boiler water supply system 3 of the present invention. The boiler water supply system 3 of the third embodiment and the steam system 1 including the same are basically the same as those of the second embodiment. Therefore, in the following description, the differences between the two will be mainly described, and corresponding portions will be described with the same reference numerals.

  The third embodiment is different from the second embodiment in the adjustment method of the cooling water amount to the heat exchanger 22 based on the liquid temperature of the lubricating oil. That is, in the second embodiment, the heat supply water pump 30 is inverter-controlled based on the temperature detected by the temperature sensor 35. However, in the third embodiment, the heat pump is configured and controlled as described below.

  In the third embodiment, the opening degree of the motor-operated valve 42 is adjusted by the regulator 43 instead of inverter-controlling the heat exchange water pump 30. Specifically, instead of installing the heat exchange water supply pump 30, an electric valve 42 is installed in the second water supply path 28. The opening of the motor-operated valve 42 is adjusted based on the temperature detected by the temperature sensor 35. By adjusting the opening degree of the electric valve 42, the amount of water supplied to the heat exchanger 22 can be adjusted, and the lubricating oil of the compressor 5 can be maintained at a desired temperature.

  In the third embodiment, since the heat exchange water supply pump 30 is not installed, the water supply from the water softener 10 to the make-up water channel 24 and the second water channel 28 is used when there is a certain amount of raw water pressure. That is, it is used when water can be supplied to the common tank 40 at the original water pressure without using the heat exchange water supply pump 30. Other configurations and effects are the same as those of the second embodiment, and thus description thereof is omitted.

  The boiler water supply system 3 of the present invention is not limited to the configuration of each of the embodiments described above, and can be changed as appropriate. In particular, it is sufficient if the configuration is intended to cool various fluids using water supplied to the boiler 2, and the configuration of the steam system 1 is not limited to the above-described embodiments.

  In each of the above embodiments, the cooling of the compressor 5 driven by the steam motor 4 has been described. However, the present invention can be similarly applied to a conventional compressor driven by electricity.

  Moreover, although the said each Example demonstrated the case where the lubricating oil of the compressor 5 was circulated through the heat exchanger 22 and aimed at cooling of the compressor 5, the boiler water supply system 3 of this invention is the compressor 5 of the compressor 5. Not only for cooling but also for other uses. In that case, instead of lubricating oil, various fluids (liquid or gas) to be cooled may be passed through the heat exchanger 22.

  Further, in each of the above embodiments, the water after passing through the heat exchanger 22 may be supplied to the water supply tank 7 via the drain recovery path 23. That is, if the high-temperature drain is directly collected in the water supply tank 7, steam is blown up, and the heat recovery rate is lowered accordingly. On the other hand, if the water from the heat exchanger 22 is mixed in the middle of the drain recovery path 23, the amount of steam escaping into the atmosphere is reduced, and the heat recovery rate can be improved. In addition, since the drain recovery passage 23 and the second water supply passage 28 are at least partially shared by piping, it is possible to simplify the configuration and reduce the cost.

It is the schematic which shows an example of a steam system provided with Example 1 of the boiler water supply system of this invention. It is the schematic which shows an example of a steam system provided with Example 2 of the boiler water supply system of this invention. It is the schematic which shows an example of a steam system provided with Example 3 of the boiler feed water system of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steam system 2 Boiler 3 Boiler water supply system 4 Steam motor 5 Compressor 7 Water supply tank 10 Soft water apparatus 11 Deoxygenation apparatus 21 Replenishment water tank 22 Heat exchanger 23 Drain recovery path 26 Water level detector 27 First water supply path 28 Second water supply Path 29 Check valve 30 Heat exchange water pump 31 Oil cooling section 32 Air cooling section 35 Temperature sensor 38 Inverter 40 Common tank 41 Supply water valve 42 Motor operated valve

Claims (7)

A water supply tank that stores water supply to the boiler and collects steam drainage from the boiler ;
Water that can be replenished so that the water level is maintained within the set range and can be supplied to the water supply tank via the first water supply channel and the second water supply channel, while backflow from the water supply tank is prevented. A tank,
A heat exchanger that is provided in the second water supply channel and through which water from the makeup water tank is passed, while a fluid to be cooled that is to be cooled by indirect heat exchange with the water is passed;
A boiler water supply system, comprising: heat supply water amount adjusting means for adjusting the amount of water supplied from the makeup water tank to the heat exchanger based on the temperature of the fluid to be cooled that is passed through the heat exchanger. Via the first water supply channel, water can be supplied from the make-up water tank to the water supply tank due to a water head pressure difference, while backflow is not possible from the water supply tank to the make-up water tank by a check valve.
The heat exchange water supply amount adjusting means is a heat supply water pump whose rotation speed is controlled by an inverter based on a temperature of a fluid to be cooled that is passed through the heat exchanger. Boiler water supply system. While the water from the makeup water tank is passed through the heat exchanger, lubricating oil and / or compressed air as the fluid to be cooled is passed from an oil lubricated compressor,
The boiler water supply system according to claim 1 or 2, wherein a water supply amount to the heat exchanger is adjusted by the heat exchange water supply amount adjusting means based on a temperature of lubricating oil or compressed air. The boiler water supply according to any one of claims 1 to 3, wherein water after passing through the heat exchanger is supplied to the water supply tank via a drain recovery path to the water supply tank. system. Soft water can be supplied to the makeup water tank through a deoxygenation device,
This deoxygenation device comprises a degassing module constituted by a hollow fiber membrane,
The water level in the makeup water tank is maintained within a set range by switching the water supply to the deaeration module based on the water level in the makeup water tank. The boiler water supply system described in the paragraph. The water supply tank and the makeup water tank are configured as one common tank,
This common tank stores the feed water to the boiler and collects steam drain from the boiler,
Water from the water softener using ion exchange resin can be supplied to the common tank via a replenishing water valve, and can be supplied to the common tank via a heat exchange water pump and the heat exchanger. ,
The boiler water supply according to any one of claims 1 to 4, wherein the supply water valve is controlled based on a water level in the common tank, and the water level in the common tank is maintained within a set range. system. The heat exchange water supply amount adjusting means is an electric valve whose opening degree is adjusted based on the temperature of the fluid to be cooled that is passed through the heat exchanger,
The boiler water supply system according to claim 6, wherein the electric valve is provided in place of the heat exchange water supply pump.

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