JP5611378B2 - Compressed air supply device and supply method - Google Patents

Description

  The present invention relates to a compressed air supply apparatus and a supply method capable of efficiently supplying compressed air at a stable temperature while suppressing pressure loss of compressed air when supplying compressed air mainly used for pneumatic equipment or the like.

  As a supply device and supply method for compressed air in an air compressor or the like, the present inventors have already invented a supply device and supply method for compressed air described in the cited documents 1 and 2. These all increase the temperature of the compressed air after cooling and dehumidification and expand the volume of the compressed air, thereby reducing the load on the pneumatic equipment.

  That is, in the supply device and the supply method described in Patent Document 1, the portion of the compressed heat generated by the compressed air compressed by the compressor is used as a heating expander, and the temperature of the compressed air that has passed through the cooling and dehumidifying device is changed to this. The heated air expander is used to supply compressed air whose temperature is increased from 45 to 60 degrees Celsius and whose volume is expanded by 15% to 20%. At this time, a temperature adjustment valve is mounted between the compressor and the heating expander so that the temperature of the compressed air is lowered when the temperature increase of the heating expander becomes excessive.

  In addition, the supply device and the supply method described in Patent Document 2 circulate the primary cooling water in the two circulation water passages to the after cooler and the cooling dehumidification tower, and make the circulation water passage of the primary cooling water in the after cooler freely openable and closable. The precooling temperature by the aftercooler is adjusted.

Japanese Patent No. 4251363 Japanese Patent No. 4168427

  According to these conventional compressed air supply devices and supply methods, it is possible to efficiently increase the capacity of compressed air and supply the compressed air compared to the conventional compressed air supply devices and supply methods. In particular, in the supply device and the supply method described in Patent Document 1, a control bypass valve is disposed in front of the cooling and dehumidifying device so that the temperature and compression ratio of the supplied compressed air can be adjusted to be constant. However, according to the research of the present inventors, it has been found that the use of this control bypass valve results in a passage pressure loss of the compressed air, resulting in a pressure loss in the compressed air after passing through the compressor.

  That is, in patent document 1, when the temperature rise of a heating expander becomes excessive, it is comprised so that compressed air may be sent to a cooler via a bypass pipe from a control bypass valve. However, in order to use this control bypass valve or bypass pipe, a large-diameter control bypass valve having a diameter of about 300 mm to 600 mm, which is the same as the main air line, is required, and pressure loss occurs when passing through this large-diameter bypass valve. It occurred. In addition, when compressed air is heated directly with a heating expander and supplied directly to a pneumatic device, it has been difficult to adjust the temperature of the compressed air constant throughout the summer and winter when the temperature changes greatly.

  On the other hand, according to Patent Document 2, the circulation water passages of the two cooling towers are used, and the primary cooling water of the circulation water passage is circulated between the after cooler and the cooling dehumidification tower, and the circulation water passage of the primary cooling water in the after cooler is provided. It is configured to be able to open and close and adjust the precooling temperature by the aftercooler. Therefore, the control bypass valve like patent document 1 is not used, but the adjustment valve which adjusts the circulating water channel of cooling water so that opening and closing is possible is used. Therefore, although the pressure loss as in Patent Document 1 does not occur, the cooling water from the two cooling towers is circulated and used in the aftercooler and the cooling dehumidification tower, so there is a disadvantage that the apparatus becomes very large. In addition, since two cooling towers are used, it is difficult to stably maintain the temperature of the compressed air to be supplied along with the seasonal temperature change, and there is a disadvantage that a lot of maintenance is required.

  Therefore, the present invention was created to solve the above-described problems, and a compressed air supply device capable of efficiently supplying compressed air at a stable temperature with a compact device while suppressing pressure loss of the compressed air. And the provision of a supply method.

According to the first means of the present invention, the aftercooler 2 and the dehumidifying device 3 are disposed downstream of the compressed air discharge pipe, and the compressed dehumidified compressed air is heated by the heating extender 4 and supplied to the pneumatic equipment. In the air supply device,
An after cooler 2 for cooling the compressed air that has passed through the heating expander 4 with cooling water is installed, and a dehumidifying device 3 for cooling and dehumidifying the cooled compressed air is installed.
After heating the compressed air dehumidified in the heating expander 4 that uses the compressed heat generated in the compressed air discharge pipe as a heat source for heating the compressed air , this compression is performed when the temperature rise of the compressed air becomes excessive. Install a cooler 5 to cool the air,
The cooler 5 is provided with a compressed air supply device configured to adjust the temperature of the compressed air using the cooling water of the aftercooler 2.

  The second means includes a mixing three-way control valve 6 in the cooler 5 and a temperature sensor 7 downstream of the cooler 5, and adjusts the cooling temperature in the cooler 5 via the temperature sensor 7. It is configured as follows.

The third means is that the aftercooler 2 and the dehumidifying device 3 are arranged downstream of the compressed air discharge pipe, and the compressed air that has been cooled and dehumidified is heated by the heating expander 4 and supplied to the pneumatic equipment. In the method
After the compressed air that has passed through the heating expander 4 is cooled with the cooling water of the aftercooler 2, the cooled compressed air is cooled and dehumidified by the dehumidifier 3, and the compressed heat generated in the compressed air discharge pipe is used for heating the compressed air. When the compressed air dehumidified by the heating expander 4 used as a heat source is heated by the heating expander 4 to increase the temperature of the compressed air and supplied to the pneumatic equipment,
In the method of supplying compressed air, the temperature of the compressed air after heating is adjusted by the cooler 5 using the cooling water of the aftercooler 2 when the temperature rise of the compressed air becomes excessive.

As described in claims 1 and 3 of the present invention, after the dehumidified compressed air is heated by the heat-increasing device 4, a cooler 5 is installed to be used when the temperature rise of the compressed air becomes excessive. Since the apparatus 5 is configured to adjust the temperature of the compressed air using the cooling water of the aftercooler 2, it is possible to suppress the pressure loss of the compressed air without using a conventional control bypass valve. In addition, since the compressed air after heating is cooled and adjusted, the temperature of the compressed air can be adjusted to be constant throughout the summer and winter when the temperature changes greatly. Further, a conventional large-scale device is not necessary, and a compact configuration can be achieved. Furthermore, the volume of the compressed air can be expanded extremely rationally by configuring the heating expander 4 so that the compressed heat generated in the discharge pipe of the compressed air is used as a heat source for heating the compressed air. It has an energy saving effect .

  As in claim 2, the cooler 5 is provided with the mixing three-way control valve 6, the temperature sensor 7 is provided downstream of the cooler 5, and the cooling temperature in the cooler 5 is adjusted via the temperature sensor 7. By comprising, the compressed air of fixed temperature can be supplied through four seasons.

It is a conceptual diagram which shows this invention supply apparatus. It is the schematic which shows one Example of this invention supply apparatus. It is a figure which shows the relationship between the discharge force of a compressor, and power consumption.

  Next, a description will be given based on the drawings. The present invention relates to a supply device and a supply method for supplying compressed air mainly used for pneumatic equipment and the like.

  In the configuration of the supply device of the present invention, a compressor 1, an after cooler 2, a dehumidifier 3, a heating expander 4, a cooler 5, a mixing three-way control valve 6, and a temperature sensor 7 are sequentially arranged (see FIG. 1).

  The compressor 1 compresses air, generates compressed air, and discharges it to a discharge pipe. Since the temperature of this compressed air rises to about 100 degrees Celsius, the aftercooler 2 is disposed downstream of the compressed air discharge pipe. The aftercooler 2 is a device that cools high-temperature compressed air with cooling water, and adjusts it to 30 to 40 degrees Celsius.

  The dehumidifying device 3 is a device that removes moisture from the compressed air cooled by the aftercooler 2, and can be arbitrarily selected from a dehumidifying device such as a cooling dehumidifying device, a moisture absorbing dehumidifying device, or a dryer. .

  The dehumidifying device 3 in the illustrated example uses a cooling dehumidifier integrated with the aftercooler 2 (see FIG. 2). That is, an air inlet for introducing compressed air is provided in the upper part of the substantially cylindrical body, and an air outlet for discharging dehumidified compressed air is formed in the lower part of the body. The upper part of the body is an aftercooler 2 and the lower part is integrally formed as a dehumidifier 3. The cooling water 2A of the aftercooler 2 is used for the cooler 5 described later. As the cooling water 2A, for example, any water such as well water or tap water can be used.

  The dehumidifying device 3 at the lower part of the fuselage uses the cooling water 3 </ b> A that is different from the aftercooler 2 (see FIG. 2). The body is provided with a cooling coil that circulates the cooling water 3A and a sprayer 3B that separates drain from the cooled compressed air. The cooling coil is provided so as to supply cold water from a cooler or a cooling tower. In this case, the temperature of the compressed air is adjusted to 15 to 30 degrees Celsius.

  The heating expander 4 heats the cooled and dehumidified compressed air with the heating expander 4 to increase the volume of the compressed air, and then supplies the compressed air to the pneumatic equipment. As an example, if air at 30 degrees Celsius is cooled to 15 degrees Celsius, its volume will be reduced by 5% due to Boyle-Charles' law. Therefore, when the compressed air of 15 degrees Celsius after cooling and dehumidification is heated to 60 degrees Celsius, the volume is increased by about 10%, and the load on the pneumatic equipment can be reduced.

  The heating expander 4 can use any heat source such as one that uses exhaust heat or one that is heated by a heater or the like. The heating expander 4 in the illustrated example uses compressed heat generated in a compressed air discharge pipe as a heat source for heating compressed air (see FIG. 2). That is, the air compressed by the compressor 1 is discharged to the discharge pipe in a state where compression heat is generated. When compression heat is generated, the compressed air rises to about 100 degrees Celsius. A portion heated by such compression heat is used as the heating expander 4. The heating expander 4 in the illustrated example is a part where the temperature of the tube itself is kept high by discharging hot compressed air.

  The cooler 5 is used when the temperature rise of the compressed air heated by the heating expander 4 becomes excessive. The cooler 5 uses the cooling water 2A of the aftercooler 2 described above. That is, when the temperature increase of the heating expander 4 becomes excessive, water is passed from the after cooler 2 to the cooler 5 to lower the temperature of the compressed air and adjusted to 45 degrees to 60 degrees Celsius.

  The cooler 5 in the illustrated example is formed continuously with the heating expander 4 (see FIG. 2). That is, the heat-increasing device 4 and the cooler 5 are accommodated in one pressure vessel. And in order to adjust the temperature of compressed air correctly with the cooler 5, the mixing three-way control valve 6 and the temperature sensor 7 are installed.

  The mixing three-way control valve 6 is attached to the cooler 5, and controls a path through which the cooling water of the aftercooler 2 passes through the cooler 5 and a path through which the coolant is not passed through the cooler 5 and is discharged as it is. The mixing three-way control valve 6 is controlled automatically or manually according to the value of the temperature sensor 7 disposed downstream of the cooler 5.

  The supply method of the present invention using such an apparatus is as follows. That is, after the compressed air that has passed through the heating expander 4 is cooled by the cooling water of the aftercooler 2, the cooled compressed air is dehumidified by the dehumidifier 3. Next, the dehumidified compressed air is heated by the heat-increasing device 4 to increase the temperature of the compressed air, and the compressed air is supplied to the pneumatic equipment in an increased volume. At this time, when the temperature rise of the compressed air becomes excessive, the temperature of the compressed air is adjusted by the cooler 5 using the cooling water of the aftercooler 2.

  When a conventional control bypass valve is used, if a passing pressure loss occurs and the air pressure decreases by 0.1 MPa, the power ratio is reduced by approximately 10% (see FIG. 3). Therefore, as in the present invention, the power ratio can be increased by 10% by means that does not use the control bypass valve and does not control the main air pipe.

  Moreover, since the cooler 5 of the present invention reuses the cooling water of the aftercooler 2, it can be configured as an extremely compact and rational device. Compressed air whose volume is expanded by heating is supplied to various pipes such as factory pipes.

  Note that the present invention is not limited to the above-described embodiments, and design changes and the like can be freely made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Compressor 2 After cooler 3 Dehumidifier 4 Heating increaser 5 Cooler 6 Mixing three-way control valve 7 Temperature sensor

Claims (3)

An aftercooler and a dehumidifying device are disposed downstream of the compressed air discharge pipe, and the compressed dehumidified air is heated by the heating expander and supplied to the pneumatic equipment. An aftercooler that cools the compressed air with cooling water, a dehumidifier that cools and dehumidifies the cooled compressed air, and a heating increase that uses the compressed heat generated in the compressed air discharge pipe as a heat source for heating the compressed air After heating the compressed air dehumidified in the cooler, install a cooler that cools the compressed air when the temperature rise of the compressed air becomes excessive, and use the cooling water of the aftercooler in the cooler A device for supplying compressed air, characterized in that the temperature of the compressed air is adjusted.   2. The compressed air according to claim 1, wherein the cooler includes a mixing three-way control valve, a temperature sensor is provided downstream of the cooler, and a cooling temperature in the cooler is adjusted via the temperature sensor. Feeding device. In the compressed air supply method, an aftercooler and a dehumidifying device are disposed downstream of the compressed air discharge pipe, and the cooled and dehumidified compressed air is heated by the heating expander and supplied to the pneumatic equipment. After the compressed air is cooled with the cooling water of the aftercooler, the cooled compressed air is cooled and dehumidified with a dehumidifier, and the compressed heat generated in the compressed air discharge pipe is used as a heat source for heating the compressed air . When the compressed air that has been cooled and dehumidified is heated to increase the temperature of the compressed air and supplied to the pneumatic equipment, if the temperature rise of the compressed air becomes excessive, it is heated with a cooler that uses the cooling water of the aftercooler A method for supplying compressed air, comprising adjusting the temperature of the compressed air afterwards.

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