TW201805529A - Air compressor system - Google Patents

Abstract

This invention provides an air compressor system using a compressor of water adding type capable of reducing the amount of water being brought outside along with the compressed air so as to reduce the amount of supplement of water from outside. The system has a compressor of water adding type 3, a preseparator 4 for separating air/water in the fluid delivered from the compressor 3, an after cooler 5 for cooling the compressed air after air/water separation by preseparator 4, a water cooler for cooling the separated water after the air/water separation by preseparator 4 and a separator tank 7 to which the compressed air and the separated water are delivered. The the separator tank 7 a compressed air delivery path is connected to an air phase unit and an adding water return tube to compressor 3 is connected to a liquid phase unit.

Description

Air compression system

The present invention relates to an air compression system using a water-added compressor.

Conventionally, as shown in FIG. 1 of the following Patent Document 1, an air compression system is known, which includes a water-lubricated air compressor (1) of a spiral type, and both ends are supported by a pair of rotors (37). The water-lubricated sliding bearing (2); the separator (6) separates the fluid (compressed air sent out with the lubricating water) from the compressor (1); the air-cooled heat exchanger (10), The water returned from the separator (6) to the rotor between the compressors (1) is cooled; and the after cooler (11) is used to cool the compressed air from the separators (6). In this system, the water piping (22) from the air-cooled heat exchanger (10) to the rotor of the compressor (1) has a bearing water supply piping (23), and the divided water system passes through the refrigeration cycle ( 27) The heat exchanger (33) for heat absorption or the bearing (2) supplied to the compressor (1) through a bypass pipe (24).

(Prior technical literature) (Patent Literature)

Patent Document 1: Japanese Patent Application Laid-Open No. 2010-43589 (paragraph [0012]-[0017], FIG. 1)

In the conventional technology, the output stream system from the compressor is directly sent to the separator tank (6). After the gas and water are separated, the compressed air is sent to the outside through the aftercooler (11). On the other hand, the separation The water system returns to the compressor through the air-cooled heat exchanger (10). Therefore, the separator tank directly introduces the fluid from the compressor, that is, it is introduced without being separated or cooled by air and water beforehand, and is maintained at a relatively high temperature. Therefore, the amount of water sent to the outside accompanied by the compressed air from the separator tank increases, and in order to make up for this amount of water, a large amount of water to be replenished from the outside is required. Furthermore, in order to cool the compressed air, an aftercooler must be provided further downstream than the separator tank. Moreover, in the conventional technology, the compression heat generated by the compressor is discarded to the outside air in an air-cooled heat exchanger (10, 11) without being heat recovered.

Therefore, the problem to be solved by the present invention is to provide an air compression system that can reduce the amount of water discharged to the outside with the compressed air from the separator tank, and can even reduce the amount of supplementary water supplied from the outside. Furthermore, to provide an air compression system, it is possible to omit the arrangement of the after cooler at a position further downstream than the separator tank. Furthermore, it is preferable to provide an air compression system capable of recovering the compression heat of the compressor.

In order to solve the above-mentioned problems, the present invention is an air compression system which is developed by the inventor and is described in item 1 of the patent application scope, and includes: Water-adding compressor; pre-separator, which separates the fluid sent from the compressor for gas-water separation; after-cooler, which cools the compressed air after gas-water separation by the pre-separator; The separated water after the aforementioned pre-separator is cooled by gas-water separation; and a separator tank for supplying compressed air and separated water after passing through the above-mentioned respective coolers, and a compressed air sending path is connected to the gas phase part. The liquid phase part is connected to a return path for adding water to the compressor.

According to the invention described in the first item of the scope of the patent application, the pre-separator is used to separate the fluid sent from the water-added compressor into the gas-water separation, and the cooler cools the compressed air after the gas-water separation. The water cooler cools the separated water and supplies it to the separator tank. Therefore, the separator tank is separated by air and water in advance and supplied with a cooled fluid, and is maintained at a relatively low temperature. Therefore, the amount of water discharged to the outside accompanied by the compressed air from the separator tank can be reduced, and even the amount of supplementary water supplied from the outside can be reduced. Further, a downstream cooler provided in the compressed air sending path and a water cooler provided in the return path of the added water downstream of the separator tank are not necessary and may be omitted.

In addition, the pre-separator is used for gas-water separation, and is divided into cooling of compressed air by a subsequent cooler and cooling of separated water by a water cooler, thereby improving the heat exchange efficiency of each cooler.

The invention described in item 2 of the scope of patent application is the air compression system described in item 1 of the scope of patent application. The aforementioned after cooler is a heat exchanger for compressed air and cooling water, and the aforementioned water cooler is for separating water and cooling. Heat exchanger for water, add the aforementioned cooling water to each of the aforementioned coolers Warm to make warm water.

According to the invention described in item 2 of the scope of the patent application, warm water can be produced by recovering the heat of compression in the after cooler and the water cooler and heating the passing water.

The invention described in the third scope of the patent application is the air compression system described in the second scope of the patent application. The cooling water passes through the water cooler after passing through the after cooler.

According to the invention described in item 3 of the scope of the patent application, warm water can be produced by sequentially heating the after cooler and the water cooler through the cooling water. By passing the cooling water through the aftercooler first, the compressed air can be cooled to the desired temperature with the cooling water at a lower temperature. Furthermore, by passing the cooling water heated in the above-mentioned manner through a water cooler, the cooling water can be further heated.

Furthermore, the invention described in item 4 of the scope of patent application is provided in the air compression system described in any one of the scope of claims 1 to 3 in the compressed air delivery path from the separator tank. There is a primary pressure regulating valve for keeping the inside of the separator tank above the set pressure. .

According to the invention described in item 4 of the scope of patent application, by keeping the inside of the separator tank at a set pressure or higher, the added water can be reliably returned from the separator tank to the compressor.

The air compression system according to the present invention can reduce the amount of water discharged to the outside with the compressed air from the separator tank, and can even Reduce external water supply. In addition, an aftercooler provided downstream of the separator tank is not necessary and may be omitted. Furthermore, the compression heat of the compressor can be recovered to produce warm water.

1‧‧‧air compression system

2‧‧‧Heat Recovery System

3‧‧‧compressor

4‧‧‧ pre-separator

5‧‧‧ after cooler

6‧‧‧ water cooler

7‧‧‧ separator tank

8‧‧‧ Electric motor

9‧‧‧air filter

10‧‧‧ Suction path

11‧‧‧Add water return path

12‧‧‧Submission route

13‧‧‧Check valve

14‧‧‧ gas phase communication path

15‧‧‧Liquid phase communication path

16‧‧‧Heat recovery heat exchanger

17‧‧‧Compressed air delivery path

18‧‧‧ primary pressure regulating valve

19‧‧‧ check valve

20‧‧‧Safety valve

21‧‧‧ air release valve

22‧‧‧Add water valve

23‧‧‧ Water Filter

24‧‧‧ Water supply route

24A‧‧‧First water supply route

24B‧‧‧Second Water Supply Path

25‧‧‧ drainage path

26‧‧‧The first water supply valve

27‧‧‧Check valve

28‧‧‧Second water supply valve

29‧‧‧Drain valve

30‧‧‧Water Level Detector

31‧‧‧Pressure sensor

32‧‧‧ entrance path

33‧‧‧ Exit route

34‧‧‧ loopback path

35‧‧‧ Switching means

36‧‧‧Heat Recovery Valve

37‧‧‧ return valve

38‧‧‧ Radiator

38A‧‧‧fan

39‧‧‧Contact Path

40‧‧‧ pump

41‧‧‧Check valve

42‧‧‧ storage tank

43‧‧‧Outlet water temperature sensor

FIG. 1 is a schematic diagram showing an air compression system according to an embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic diagram showing an embodiment of the present invention, showing an air compression system 1 for manufacturing compressed air, and a heat recovery system 2 capable of recovering compression heat by the air compression system 1. That is, in this embodiment, the air compression system 1 is provided with the heat recovery system 2. On the contrary, the heat recovery system 2 is applied to the air compression system 1. Hereinafter, the air compression system 1 and the heat recovery system 2 will be described in order.

≫Composition of Air Compression System 1≫

First, the configuration of the air compression system 1 of this embodiment will be described. The main part of the air compression system 1 of this embodiment is provided with: a water-adding compressor 3; a pre-separator 4 for gas-water separation of the fluid sent from the compressor 3; and a post-cooler 4 for The compressed air after the gas-water separation of the separator 4 is cooled; the water cooler 6 cools the separated water after the gas-water separation by the pre-separator 4; and the separator tank 7 Compressed air and separated water after passing each cooler 5,6.

Compressor 3 is a water-added air compressor. The form of the compressor 3 is not particularly limited, but may be, for example, a screw type or a scroll type. Water-adding compressor 3 is to add water (typically purified water (pure water) or demineralized water) to the air inlet, and use the added water in the compression chamber's seal or the cooling of the compression mechanism. Compress the air and send it out. At the time of this sending, the added water is also sent out together with the compressed air.

The compressor 3 is driven by the electric motor 8 in the example shown in the figure, and can be driven by another prime mover. For example, the compressor 3 may be driven by a steam motor (steam engine). In addition, the compressor 3 may perform on-off control and capacity control (output adjustment). For example, the compressor 3 performs on-off control of the electric motor 8 or inverter control of the number of revolutions of the electric motor 8. Alternatively, in the case of a steam motor, the opening or closing or opening degree of the steaming valve of the steam motor is controlled.

When the compressor 3 is operated, the outside air passes through the air filter 9 and is sucked into the compressor 3 from the suction path 10. At this time, the details are described later. The added water is returned through the return path 11 from the separator tank 7 to set the flow rate. water. Then, the compressed air in the compressor 3 is sent to the pre-separator 4 with the added water. The discharge path 12 from the compressor 3 to the pre-separator 4 is provided with a check valve 13.

The water-added compressor 3 may be a water-lubricated or water-jet type (in other words, a water-lubricated or water-jet type). In addition, although the compressor 3 here is adding water to the air inlet, it may be provided with a water supply port other than the air inlet, and water may be added to the water supply port.

The pre-separator 4 receives the fluid sent out from the compressor 3 (compressed air sent out together with the added water) and performs gas-water separation. That is, the outflow system from the compressor 3 is separated into compressed air and separated water in the pre-separator 4. With this, the interior of the pre-separator 4 is divided into a gas phase portion above and a liquid phase portion below. The gas phase portion of the pre-separator 4 is connected to the gas phase portion of the separator tank 7 through the gas-phase communication path 14. On the other hand, the liquid phase portion of the pre-separator 4 is connected to the liquid-phase communication path 15. Connected to the liquid phase portion of the separator tank 7.

An after-cooler 5 is provided in the gas-phase communication path 14 from the pre-separator 4 to the separator tank 7. The aftercooler 5 is a means for cooling the compressed air separated by the air-water separation of the pre-separator 4. Here, in the heat recovery heat exchanger 16 for recovering the compression heat, the after cooler 5 performs heat exchange without mixing compressed air and a cooling liquid. In the aftercooler 5, the compressed air is cooled by a cooling liquid, and the cooling liquid is warmed by a compressed air.

A water cooler 6 is provided in the liquid-phase communication path 15 from the pre-separator 4 to the separator tank 7. The water cooler 6 is a means for cooling the separated water separated by the gas separator from the pre-separator 4. Here, in the heat recovery heat exchanger 16 for recovering the compression heat, the water cooler 6 performs heat exchange without mixing compressed air and a cooling liquid. In the water cooler 6, the separated water is cooled by the cooling liquid, and the cooled liquid is heated by the separated water.

The separator tank 7 receives compressed air and separated water after passing through each of the coolers 5 and 6 to perform gas-water separation. From pre-separator 4 The compressed air is cooled by the cooler 5 to condense the moisture, which is removed in the separator tank 7. Therefore, the inside of the separator tank 7 can also be divided into a gas phase portion above and a liquid phase portion below. The fluid supply from the pre-separator 4 to the separator tank 7 through the communication paths 14 and 15 is performed by the discharge pressure of the compressor 3 or the head pressure difference.

In addition to the aforementioned gas-phase communication path 14, the gas-phase portion of the separator tank 7 is connected to a compressed-air sending path 17 toward the compressed-air utilization portion. In the compressed air delivery path 17, a primary pressure regulating valve 18 and a check valve 19 are sequentially provided from the side of the separator groove 7. The primary pressure regulating valve 18 is a valve that maintains the inside of the separator tank 7 at a pressure higher than a set pressure during the operation of the compressor 3. Here, the primary pressure regulating valve 18 is a self-operating valve that is mechanically operated according to the pressure on the primary side (that is, the side of the separator tank 7). Depending on the situation, the pressure on the primary side can also be monitored by a sensor. Pressure controlled electric valve. Further, in the present embodiment, in addition to the safety valve 20, a gas release valve 21 for exhausting to the outside is provided in the gas phase portion of the separator tank 7. In addition, the primary pressure regulating valve 18 and the check valve 19 may be configured as an integrated valve mechanism.

In addition to the liquid-phase communication path 15 described above, the liquid-phase portion of the separator tank 7 is connected to a water return path 11 to the compressor 3. In the added water return path 11, a water addition valve 22 and a water filter 23 are provided in this order from the side of the separator tank 7. During the operation of the compressor 3, by opening the adding water valve 22, the stored water in the separator tank 7 is returned to the compressor 3 through the added water return path 11 to the compressor 3. At this time, the suction of the compressor 3 and the pressure in the separator tank 7 are performed by the operation of the compressor 3, The added water can be returned from the separator tank 7 to the compressor 3. In addition, by the primary pressure adjusting valve 18, the inside of the separator tank 7 is lifted before being maintained above the set pressure. As described later, the pressure in the compressed air delivery path 17 (more specifically, the pressure in the separator tank 7) Since the pressure is maintained at a desired pressure, it is possible to supply the added water to the compressor 3 at a set flow rate while the added water valve 22 functions as an orifice. When the added water is supplied from the separator tank 7 to the compressor 3, the water filter 23 can be used to remove the inclusions.

The air compression system 1 further includes a water supply path 24 and a drainage path 25. The water supply path 24 is a means for replenishing water from a water supply source of an ion exchange device (such as a mixed bed type pure water device or a hard water softening device) as added water. In this embodiment, the water supply path 24 from the water supply source is divided into a first water supply path 24A and a second water supply path 24B. The first water supply path 24A is connected to the suction path 10 that is sucked into the compressor 3. On the other hand, The second water supply path 24B is connected to the separator tank 7. A first water supply valve 26 is provided in the first water supply path 24A, and a check valve 27 and a second water supply valve 28 are provided in the second water supply path 24B in this order. In addition, in this embodiment, the first water supply valve 26 is a solenoid valve, and the second water supply valve 28 is a manual valve.

On the other hand, the drainage path 25 is connected to the bottom of the separator tank 7. A drainage valve 29 is provided in the drainage path 25. By opening the drainage valve 29, drainage from the inside of the separator tank 7 can be achieved.

In addition, a water level detector 30 is provided in the separator tank 7. Although the structure of the water level detector 30 is not particularly limited, it may be configured to detect purified water that does not contain, for example, ions. Buoy-type water level Detector. Further, a pressure sensor 31 is provided in the compressed air delivery path 17 from the separator tank 7 further downstream than the primary pressure regulating valve 18 or the check valve 19. The pressure sensor 31 can monitor the compressed air supply pressure (supply pressure to the compressed air utilization part).

≫Operation of Air Compression System 1≫

Next, the operation of the air compression system 1 of this embodiment will be described. One of the series of controls described below is basically performed automatically by a controller (not shown). That is, the controller is connected to the compressor 3 (specifically, its motor 8), the air release valve 21, the water addition valve 22, the first water supply valve 26, the drain valve 29, the water level detector 30, and the pressure sensor. 31, etc., and controls the compressor 3 or each valve 21, 22, 26, 29, etc. according to the detection signal of the water level detector 30 or the pressure sensor 31 and the like.

First, the flow of air will be described. When the operation of the compressor 3 is started, the compressor 3 sucks air through the air filter 9, compresses it, and sends it out. The compressed air sent from the compressor 3 passes through the pre-separator 4, the after-cooler 5, and the separator tank 7 and is sent from the compressed-air sending path 17 to the compressed-air utilization unit. However, since the primary pressure regulating valve 18 is provided in the compressed air delivery path 17, after the start of the operation, the primary pressure regulating valve 18 will be closed to the compressed air when the pressure in the separator tank 7 is low. The compressed air in the utilization section is not sent out. When the pressure on the primary side of the primary pressure regulating valve 18 (that is, the side of the separator tank 7) is equal to or higher than the set pressure, the primary pressure regulating valve 18 is opened and the compressed air to the compressed air utilization part is sent out.

During the operation of the compressor 3, the compressor 3 is controlled so that the detection pressure of the pressure sensor 31 is maintained at the target pressure. For example, the motor 8 of the compressor 3 is controlled by on-off, or controlled by an inverter. The target pressure is higher than the set pressure of the primary pressure regulating valve 18. Therefore, basically, the separator tank 7 is maintained at the target pressure thereafter.

During operation of the compressor 3, by opening the water adding valve 22, water can be added to the inlet and outlet of the compressor 3 at a set flow rate. Thereby, sealing, cooling, and lubrication of the compressor 3 can be achieved. The compressed air from the compressor 3 is sent to the pre-separator 4 with the addition of water. The pre-separator 4 seeks gas-water separation. The compressed air after the air-water separation is performed by the pre-separator 4 is cooled by the cooler 5 later, and the air-water separation is further performed by the separator tank 7, and the compressed air is sent from the compressed air delivery path 17 to the outside. On the other hand, after the separation water from the pre-separator 4 is cooled by the water cooler 6, it is stored in the separator tank 7 and can be supplied to the compressor 3 through the added water return path 11.

During the operation of the compressor 3, the water level in the separator tank 7 is maintained at a set water level. For example, when the water level detected by the water level detector 30 exceeds the upper limit water level, the drain valve 29 is opened to lower the water level to a predetermined position. Conversely, when the detected water level by the water level detector 30 exceeds the lower limit water level, the first water supply valve 26 is opened and the water level is raised to a predetermined position. When the first water supply valve 26 is opened, the makeup water is supplied to the separator tank 7 through the compressor 3. During this period, the addition water valve 22 may be closed. In addition, when the compressor 3 is stopped, the second water supply valve 28 is opened to directly supply water to the separator tank 7.

On the other hand, when the compressor 3 is stopped, the purge valve 21 is opened. The air release valve 21 is also opened before the compressor 3 is stopped, thereby preventing the compressor 3 from being reversed. Then, when the compressor 3 is restarted, the purge valve 21 is closed.

According to the air compression system 1 of this embodiment, the pre-separator 4 separates the fluid sent from the compressor 3 for gas-water separation, and after that, the cooler 5 cools the compressed air after the gas-water separation, and on the other hand, water cooling The separator 6 cools the separation water, and then supplies it to the separator tank 7. Therefore, the separator tank 7 is supplied with a fluid that has been previously separated and cooled by gas and water to maintain a relatively low temperature. The temperature in the separator tank 7 is maintained below the dew point temperature of the compressed air. Therefore, the amount of water discharged to the outside due to the compressed air from the separator tank 7 can be reduced, the amount of supplementary water supplied from the outside can be further reduced, and the running cost can be reduced. In addition, it is basically unnecessary to provide a second aftercooler in the compressed air sending path 17 or a second water cooler in the added water return path 11 respectively.

Furthermore, according to the air compression system 1 of this embodiment, the air-water separation is performed by the pre-separator 4, and is divided into the cooling of the compressed air by the cooler 5 and the cooling of the separated water by the water cooler 6, Thereby, the heat exchange efficiency of each cooler 5 and 6 can be made. With this, the heat exchangers constituting the respective coolers 5 and 6 can be miniaturized.

≫Construction of heat recovery system 2≫

Next, the configuration of the heat recovery system 2 of this embodiment will be described. The heat recovery system 2 of this embodiment uses the compression heat of the compressor 3 A system that performs heat recovery when the coolant is warmed, and the presence or absence of heat recovery can be switched.

Although the cooling liquid is not particularly limited, it is typically water. This water can be used in addition to tap water, demineralized water, purified water (pure water), etc., depending on the application. For example, in the case of using the heat recovery system 2 to preheat the water supply of the steam boiler, demineralized water subjected to degassing treatment as described later is used. Hereinafter, the cooling liquid is described as water (that is, cooling water), and the same applies to other liquids. In other words, in the following description, the cooling water may be not water as described in the text, or a cooling liquid other than water.

The main part of the heat recovery system 2 of this embodiment is provided with: a heat recovery heat exchanger 16 (after cooler 5, water cooler 6) for heating cooling water by the compression heat of the compressor 3; cooling; An inlet path 32 through which water flows to the heat recovery heat exchanger 16; an outlet path 33 through which cooling water flows from the heat recovery heat exchanger 16; a return path 34 for cooling water connected to the outlet path 33 and the inlet path 32; Switching means 35 (heat recovery valve 36, return valve 37) for the liquid flow path and the circulation path; and a radiator 38 for cooling the circulating cooling water of the circulation path.

The heat recovery heat exchanger 16 is an after cooler 5 and a water cooler 6 in this embodiment. In the aftercooler 5, heat is exchanged between the compressed air and the cooling water, the compressed air is cooled by the cooling water, and the cooling water is heated by the compressed air. The heat of compression of compressed air is used for heating the cooling water, and heat recovery can be achieved. On the other hand, the water cooler 6 performs heat exchange between the added water (separated water in the pre-separator) and the cooling water, and cools the added water with the cooling water, and on the other hand, adds water Warm the cooling water. The compression heat of the added water is used for heating the cooling water, and heat recovery can be achieved.

In addition, the after cooler 5 and the water cooler 6 are in this embodiment, and the cooling water will sequentially pass through. Therefore, in this embodiment, the aftercooler 5 and the water cooler 6 are connected by a communication path 39. The cooling water flows from the inlet path 32 to the outlet path 33 in this order through the aftercooler 5, the communication path 39, and the water cooler 6. Hereinafter, the cooler 5 and the water cooler 6 are aligned after being connected by the communication path 39, and are simply referred to as a heat recovery heat exchanger 16 for heat recovery.

A pump 40, a check valve 41, and a radiator 38 are sequentially provided in the inlet path 32 from the water supply source to the heat recovery heat exchanger 16 to the heat recovery heat exchanger 16. By operating the pump 40, the cooling water can pass through the heat recovery heat exchanger 16. The radiator 38 is air-cooled in this embodiment, and performs heat exchange between cooling water and outside air (ventilation by a fan 38A). Although the details are described later, for example, when the temperature of the cooling water at the inlet side of the radiator 38 is higher than the outside air temperature, the cooling water can be cooled by the ventilation of the fan 38A by operating the fan 38A of the radiator 38. .

A heat recovery valve 36 is provided in the exit path 33 from the heat recovery heat exchanger 16. During the operation of the compressor 3, the pump 40 is operated by opening the heat recovery valve 36, and the cooling water is passed through the heat recovery heat exchanger 16 to recover the compression heat. The heat recovery valve 36 is constituted by an electric valve whose opening degree can be adjusted in this embodiment.

An outlet path 33 upstream of the heat recovery valve 36 and an inlet path 32 upstream of the pump 40 are connected by a return path 34. At this time, it is preferable that a storage tank 42 for cooling water is provided in advance at a connection portion between the inlet path 32 and the return path 34. However, the storage tank 42 may be omitted according to circumstances. In addition, the storage tank 42 is not provided in a connection portion of the inlet path 32 and the return path 34, and may be provided at a position further downstream (preferably more upstream than the pump 40) than the connection position. In addition, the pump 40 may be provided further downstream than the connection portion of the inlet path 32 and the return path 34, and may also be provided upstream of the connection path 39 or the connection path of the return path 34 in the outlet path 33. position.

A return valve 37 is provided in the return path 34. The return valve 37 is constituted by an electric valve in this embodiment. Although the details are described later, by selectively opening either the heat recovery valve 36 or the return valve 37, it is possible to switch through the return path 34 to return the cooling water that has passed through the heat recovery heat exchanger 16 to the inlet path 32. , Or sent downstream of the exit path 33 without passing through the loopback path 34.

The switching means 35 is composed of a heat recovery valve 36 and a return valve 37 in this embodiment. By switching the opening and closing of each of the heat recovery valve 36 and the return valve 37, the cooling water flow path can be switched to any one of the following liquid flow path and circulation path

The liquid flow path is realized by opening the heat recovery valve 36 with the return valve 37 closed. The liquid flow path includes a path of the inlet path 32, the heat recovery heat exchanger 16, and the outlet path 33, and does not include the return path 34. When the pump 40 is operated with the liquid flow path set, the cooling water from the inlet path 32 is discharged through the heat recovery heat exchanger 16 and the heat recovery valve 36 of the outlet path 33 (heat recovery implementation state). . at this time, The storage tank 42 is appropriately supplied with water from a water supply source. In other words, while the pump 40 is operated in the liquid-passing path, water from the water supply source is supplied to the inlet path 32.

動作時，來自泵40之冷却水係透過熱回收用熱交換器16及回送路徑34被送回泵40而循環。此時，藉由使散熱器38動作，即可在散熱器38中將循環冷卻水予以冷卻(熱回收停止狀態)。此外，在循環路徑使冷卻水循環之期間，無須從供水源對儲槽42進行新的供水。 The circulation path is realized by opening the return valve 37 with the heat recovery valve 36 closed. The circulation path is a path including an inlet path 32 downstream of the connection part of the return path 34, a heat recovery heat exchanger 16, an outlet path 33 upstream of the connection part of the return path 34, and a return path 34. Make the pump 40 with the circulation path set

During operation, the cooling water from the pump 40 is sent back to the pump 40 through the heat recovery heat exchanger 16 and the return path 34 to circulate. At this time, by operating the radiator 38, the circulating cooling water can be cooled in the radiator 38 (heat recovery stopped state). In addition, while cooling water is circulated in the circulation path, it is not necessary to supply fresh water to the storage tank 42 from the water supply source.

The outlet path 33 is provided with an outlet temperature sensor 43 on the outlet side of the heat recovery valve 36. On the other hand, the inlet path 32 is provided with a water supply temperature sensor (not shown) on the inlet side of the radiator 38. The water supply temperature sensor can detect the water temperature of the water source as long as it is on the upstream side of the inlet path 32 than the radiator 38. However, when the storage tank 42 is provided in the inlet path 32, the water supply temperature sensor is preferably provided in the storage tank 42 in the inlet path 32 or downstream of the storage tank 42 and is provided more than the radiator 38. Upstream. In addition, the heat recovery system 2 of this embodiment can also detect the outside air temperature, and an outdoor air temperature sensor (not shown) can also be provided.

≫Operation of heat recovery system 2≫

Next, the operation of the heat recovery system 2 of this embodiment will be described. Bright. One of the series of controls described below is automatically performed by a controller (not shown). That is, the controller is connected to the pump 40, the radiator 38 (specifically, the motor of its fan 38A), the heat recovery valve 36, and the return valve 37, and is connected to the outlet temperature sensor 43 and the water supply temperature sensor. And the outside air temperature sensor, etc., and control the pump 40, the fan 38A, and the valves 36, 37, etc. according to the detection signals and the like of each temperature sensor.

During the operation of the compressor 3 (that is, during the production of compressed air), the pump 40 is operated, and the cooling water is passed through the heat recovery heat exchanger 16. Accordingly, in the heat recovery heat exchanger 16, the fluid (compressed air or added water) sent from the compressor 3 can be cooled, and the cooling water can be heated by the heat of compression from the fluid sent out. The hot water manufactured in this way is switched by the switching means 35 in accordance with the use load of the hot water utilization part (presence or absence of the warm water requirement of the hot water utilization part at the end of the outlet path 33). That is, when warm water is required in the warm water utilization section, the liquid flow path is switched, and when warm water is not required in the warm water utilization section, the circuit is switched to the circulation path.

For example, the heated water in the heat recovery heat exchanger 16 can be supplied to the water supply tank of the steam boiler through the outlet path 33, and the liquid passing path and the circulation path can be switched according to the water level in the water supply tank. At this time, for example, when the water level in the water supply tank is lower than the lower limit water level, it is only necessary to supply and supply warm water as a liquid flow path until the upper limit water level is exceeded. Furthermore, when the water level in the water supply tank exceeds the upper limit water level, it may be switched to a circulation path.

In addition, when the heat recovery system 2 is used for preheating the water supply to the water boiler's water supply tank (in other words, when the water supply to the water boiler's water supply tank is used as cooling water), it is supplied to the inlet path 32 and supplied. Deaerated softened water treated by a hard water softening device and a degassing device (deacidification device). At this time, in order to prevent re-dissolution of oxygen in the storage tank 42, it is preferable to float plastic beads on one side of the water surface of the storage tank 42.

In order to carry out heat recovery (in other words, water to the outside) while cooling water is passed through the heat recovery heat exchanger 16, the switching means 35 is switched to a liquid-passing path. In the liquid flow path, the return valve 37 is closed, and the heat recovery valve 36 is opened. In addition, as will be described in detail later, the fan 38A is typically stopped. At this time, the water from the water supply source is heated in the heat recovery heat exchanger 16 and sent to the warm water utilization section downstream of the outlet path 33. At this time, the opening degree of the heat recovery valve 36 is adjusted so that the detection temperature of the outlet temperature sensor 43 is maintained at a set temperature, and hot water with a temperature set to the warm water utilization unit can be supplied.

In order to stop the heat recovery (in other words, the water is discharged to the outside) while cooling water is passed through the heat recovery heat exchanger 16, the switching means 35 is switched to a circulation path. In the circulation path, the heat recovery valve 36 is closed, and the return valve 37 is opened. In addition, the fan 38A of the heat sink 38 is operated. At this time, the cooling water heated by the heat recovery heat exchanger 16 is returned to the inlet path 32 via the return path 34, and after being cooled by the radiator 38, it is supplied to the heat recovery heat exchanger 16. That is, the cooling water is circulated in the heat recovery heat exchanger 16 while being radiated to the outside air by the radiator 38.

While the cooling water is flowing through the liquid-passing path, the fan 38A of the radiator 38 can also be controlled as follows according to the detection temperature of the water supply temperature sensor and the detection temperature of the outside air temperature sensor. That is, in In the state of the liquid path, when the detection temperature of the water supply temperature sensor is lower than that of the outside air temperature sensor, the fan 38A of the radiator 38 is operated. Thereby, the cooling water can be heated by the outside air and the radiator 38 (that is, the radiator 38 is used as a heater), and the cooling water of the heat recovery heat exchanger 16 can be preheated. On the other hand, when the detection temperature of the water-supply temperature sensor is higher than the detection temperature of the outside-air temperature sensor in the state of being in the liquid-passing path, the fan 38A of the radiator 38 is stopped. Thereby, the lack of cooling water cooling by the radiator 38 by the outside air is avoided.

However, in this embodiment, as described above, the inlet path 32 is provided at the connection portion of the return path 34 or downstream of the connection portion, and a cooling water storage tank 42 is provided. At this time, in the heat recovery in which the switching means 35 is a liquid-passing path, the storage tank 42 stores lower-temperature cooling water from a water supply source. Therefore, when the heat recovery is stopped using the switching means 35 as a circulation path, the comparatively low-temperature cooling water in the storage tank 42 can first be circulated in the heat recovery heat exchanger 16. This makes it possible to suppress a change in the temperature of the cooling water when switching is performed by the switching means 35.

Next, a modification of the heat recovery system 2 of this embodiment will be described. First, the installation position of the radiator 38 is not particularly limited as long as it is within the circulation path. For example, in the foregoing embodiment, the radiator 38 is provided on the inlet path 32 (the inlet path 32 on the downstream side than the connection portion with the return path 34), but may be provided on the outlet path 33 (than the return path 34). The connection point is further upstream from the exit path 33) or the return path 34. However, when the radiator 38 is installed in the inlet path 32, as described above, in the liquid-passing path, the cooling is performed according to the relationship between the water supply temperature and the outside air temperature. But the water is warming up. On the other hand, when the radiator 38 is provided in the outlet path 33 or the return path 34, in the liquid flow path, the fan 38A of the radiator 38 may be stopped in advance regardless of the water supply temperature or the outside air temperature. In this case, the arrangement of the water supply temperature sensor or the outside air temperature sensor may be omitted. In addition, when the radiator 38 is installed at any position, the fan 38A of the radiator 38 is also operated in the circulation path.

In addition, the switching means 35 is not particularly limited as long as the cooling water flow can be switched between the liquid-passing path and the circulation path. For example, the switching means 35 may be a three-way valve provided at a connection portion between the outlet path 33 and the return path 34, or an inlet path 32 is a three-way valve connected to the return path 34.

Furthermore, in the foregoing embodiment, the cooling water is passed through the aftercooler 5 and then passed through the water cooler 6, but it may be passed through the aftercooler 5 after passing through the water cooler 6 as appropriate. However, passing the aftercooler 5 first has the advantage that, when the compressed air can be reliably cooled, the water cooler 6 can further increase the temperature of the cooling water heated in the above-mentioned manner.

Furthermore, in the aforementioned embodiment, after passing the cooling water in series as the heat recovery heat exchanger 16, the cooler 5 and the water cooler 6 may pass in parallel as appropriate. That is, downstream of the inlet path 32, the cooling water is made to have two sides, and one side passes through the aftercooler 5 and the other side passes through the water cooler 6, and then merges and passes through the outlet path 33.

In addition, in the foregoing embodiment, although both the after cooler 5 and the water cooler 6 are set as the heat recovery heat exchanger 16, it may be Either one can be used as the heat recovery heat exchanger 16. For example, only the aftercooler 5 may be used as the heat recovery heat exchanger 16, and the cooling water from the inlet path 32 may pass through the aftercooler 5 and be led out from the outlet path 33. At this time, the water cooler 6 cools the separated water from the pre-separator 4 by other means (for example, ventilation by a fan). In contrast, only the water cooler 6 is used as the heat recovery heat exchanger 16, and the cooling water from the inlet path 32 passes through the water cooler 6 and is led out from the outlet path 33. At this time, the aftercooler 5 may cool the compressed air from the compressor 3 by other means (for example, ventilation by a fan).

Furthermore, in the foregoing embodiment, the opening degree of the heat recovery valve 36 can also be adjusted according to the detection temperature of the outlet temperature sensor 43 in the cooling water in the through water of the liquid flow path, and according to the outlet temperature sensor 43 The detected temperature is controlled by the inverter of the pump 40, and the outlet temperature is controlled to be constant. Or, the implementation of the certain control of the outlet water temperature is omitted according to the situation.

Furthermore, in the aforementioned embodiment, although water was passed through the heat recovery heat exchanger 16, liquids other than water were passed through as described above. That is, the heat recovery heat exchanger 16 is not limited to a water-cooled type when cooling compressed air or added water, and may be a liquid-cooled type using another liquid.

In addition, in the case where warm water is produced by performing heat recovery by the heat recovery heat exchanger 16, although water (cooling water) is passed through the heat recovery heat exchanger 16 in the foregoing embodiment, the following method may be used. Make up. That is, between the heat recovery heat exchanger 16 and another heat exchanger (hereinafter referred to as a heat exchanger for water heating), an antifreeze or water such as ethylene glycol may be circulated. And heat exchange between the circulating liquid and compressed air in the heat recovery heat exchanger 16; on the other hand, the circulating liquid and the passing water are heat exchanged in the heat exchanger for water heating, and The through-water heating heat exchanger heats the through-water to produce warm water.

The air compression system 1 of the present invention is not limited to the configuration (including control) of the aforementioned embodiment (including the modification), and may be appropriately changed. In particular, the other components are not particularly limited as long as the following components are provided: (a) a water-adding compressor 3; (b) a pre-separator 4 that separates the fluid sent from the compressor 3 by gas-water separation; The cooler 5 cools the compressed air separated by the air-water separation by the pre-separator 4; the water cooler 6 cools the separated water separated by the air-water separation by the pre-separator 4; the separator tank 7 is supplied through each cooling The compressed air and separated water after the devices 5 and 6 are connected to the compressed air sending path 17 in the gas phase part, and the added water return path 11 to the compressor 3 is connected to the liquid phase part.

For example, in the foregoing embodiment, the after-cooler 5 and the water cooler 6 have a structure for recovering heat, but this is not necessary. That is, the after-cooler 5 is only required to be capable of cooling compressed air, and the structure is not particularly limited, and may be, for example, an air-cooled type (cooling by a fan). Similarly, the water cooler 6 is capable of cooling and separating water, and the structure is not particularly limited. For example, the water cooler 6 may be an air cooling type (cooling by a fan).

Alternatively, even if the after cooler 5 and / or the water cooler 6 are liquid-cooled (typically, water-cooled), liquid can be circulated between liquid cooling devices such as a cooling tower or a cooler. That is, in the foregoing embodiment, it may be used only as a configuration of the circulation path. In the after cooler 5 or the water cooler 6, Cooling water is circulated between the radiator 38 and the radiator 38. In addition, on the contrary, in the foregoing embodiment, the arrangement of the return path 34 may be omitted as a configuration of only the liquid-passing path.

The heat recovery system 2 added to the air compression system 1 of the present invention can also suitably use applications other than water supply preheating of the steam boiler exemplified in the foregoing embodiment. For example, the warm water produced in the heat recovery system 2 may be used as an air conditioner in a factory or an office, and may also be used for heat preservation or cleaning in various manufacturing processes.

1‧‧‧air compression system

2‧‧‧Heat Recovery System

3‧‧‧compressor

4‧‧‧ pre-separator

5‧‧‧ after cooler

6‧‧‧ water cooler

7‧‧‧ separator tank

8‧‧‧ Electric motor

9‧‧‧air filter

10‧‧‧ Suction path

11‧‧‧Add water return path

12‧‧‧Submission route

13‧‧‧Check valve

14‧‧‧ gas phase communication path

15‧‧‧Liquid phase communication path

16‧‧‧Heat recovery heat exchanger

17‧‧‧Compressed air delivery path

18‧‧‧ primary pressure regulating valve

19‧‧‧ check valve

20‧‧‧Safety valve

21‧‧‧ air release valve

22‧‧‧Add water valve

23‧‧‧ Water Filter

24‧‧‧ Water supply route

24A‧‧‧First water supply route

24B‧‧‧Second Water Supply Path

25‧‧‧ drainage path

26‧‧‧The first water supply valve

27‧‧‧Check valve

28‧‧‧Second water supply valve

29‧‧‧Drain valve

30‧‧‧Water Level Detector

31‧‧‧Pressure sensor

32‧‧‧ entrance path

33‧‧‧ Exit route

34‧‧‧ loopback path

35‧‧‧ Switching means

36‧‧‧Heat Recovery Valve

37‧‧‧ return valve

38‧‧‧ Radiator

38A‧‧‧fan

39‧‧‧Contact Path

40‧‧‧ pump

41‧‧‧Check valve

42‧‧‧ storage tank

43‧‧‧Outlet water temperature sensor

Claims (4)

An air compression system includes: a water-adding compressor; a pre-separator that separates the fluid sent from the compressor for gas-water separation; and an after-cooler that cools the compressed air that is separated by the pre-separator from gas-water separation Water cooler, which cools the separated water separated by the aforementioned pre-separator; the separator tank supplies compressed air and separated water after passing through the aforementioned coolers, and the compressed air is connected to the gas phase. On the other hand, the liquid phase portion is connected to a return path for adding water to the compressor. The air compression system according to item 1 of the scope of patent application, wherein the after cooler is a heat exchanger for compressed air and cooling water, and the water cooler is a heat exchanger for separating water and cooling water. The aforementioned cooling water is heated in a vessel to produce warm water. The air compression system according to item 2 of the scope of patent application, wherein the cooling water passes through the water cooler after passing through the after cooler. The air compression system according to any one of claims 1 to 3, wherein the compressed air from the separator tank is provided with a path for keeping the inside of the separator tank at a set position. Primary pressure adjustment valve above pressure.