KR20030010244A - Air dryer for recyling heat by blower - Google Patents

Abstract

PURPOSE: Provided is an air drier with blower, which is characterized in that a portion of dried air is fed to a regeneration tank(20) by the blower(100), so that heat requirement is diminished compared with using wet air to heat regeneration tank(20). During cooling, any loss of dried air is also diminished by keeping the dryness of dried air steadily thus saving energy requirement. CONSTITUTION: In an air drier with blower comprising a first four way valve(30) for selectively supplying wet air to a dehumidifier(10) or a regeneration tank(20) wherein the dehumidifier(10) and the regeneration tank(20) eliminate moisture of wet air to make wet air into dry air; two valves(40,50) which are installed in the dehumidifier(10) and the regeneration tank(20) respectively to exit moisture generated during regeneration to the outside; and a second four way valve(30') which is installed at the upper of the dehumidifier(10) and the regeneration tank(20) for preventing any back flow of dry air (DA), the air drier is characterized by comprising further a blower(100) which introduces a portion of dry air exit from the dehumidifier into the regeneration tank(20); a heater(80) for heating dry air introduced by the blower; a cooler(110) for cooling dry air introduced by the blower; a cooler(110') which supplies dry air to an ejector after cooling air introduced via the regeneration tank; and a separator(120').

Description

Circulating Heat Regenerative Air Dryer with Blower {Air dryer for recyling heat by blower}

The present invention relates to a circulating heating regenerative air drying apparatus that removes water contained in the heated air while circulating air supplied at a high pressure or a low pressure.

More specifically, a blower is installed in the circulation heating regenerative drying apparatus so that a part of the air dried while passing through the dehumidification tank is introduced into the regeneration tank by the blower, so that less heat is used when using the humid air during heating. The present invention relates to a circulating heating regenerative air drying apparatus employing a blower capable of heating, and preventing the consumption of dry air required for regeneration while maintaining the dryness as it cools, thereby increasing energy saving.

In general, a dryer for removing moisture contained in the air is widely used in various automated equipment, semiconductor production lines, and instrument production lines that require dry air.

If the drying device of compressed air is divided into large parts, the temperature of the compressed air is reduced by using a refrigeration compressor, and the frozen air is condensed and dehumidified by condensing saturated water in the air, and the humid air is passed through a tank filled with a dehumidifying agent. There is an adsorption type that produces dry air by allowing moisture contained in the air to be adsorbed to the numerous micropores of the dehumidifying agent.

Referring to the technical configuration of the adsorption-type drying apparatus for reference as follows.

In other words, two dehumidification and regeneration tanks in which a dehumidifying agent (or a desiccant, an adsorbent and a desiccant) are built, and the direction of the compressed air supplied to these dehumidification and regeneration tanks is alternately changed to perform the functions of the dehumidification and regeneration tanks. The main body is composed of a directional valve, an electromagnetic valve for controlling the operation of the directional valve, and a control panel with a timer.

In addition, the direction switching valve may optionally use a two-way valve, a three-way valve and a four-way valve as needed, and the direction is always switched at a constant cycle by the switching cycle set in the control panel, and the switching cycle has a humidity of 100 The function of the dehumidification and regeneration tanks is set so that the functions of the dehumidification and regeneration tanks can be easily switched on the premise of using% air.

According to this, the tank which performs the function of the dehumidification tank needs the regeneration air for discharging the water absorbed in the process of dehumidification, and this regeneration air is used by decompressing and expanding the dried compressed air.

Such an adsorption-type drying apparatus induces perfect regeneration by appropriately using the energy required for regeneration (dry air or electricity, steam, etc.), and it is possible to drastically reduce operating expenses only by saving renewable energy.

On the other hand, the adsorption-type drying apparatus is classified into a non-heating type that requires no heat source and a heater type that requires a heat source according to a regeneration method.

The non-heating type has the disadvantage that there is no heat source during regeneration, so the consumption of regenerated air and the use efficiency of energy are considerably low, while the heater type has the advantage of low consumption of regenerated air and high energy use efficiency.

The heater-type air drying apparatus used so far is roughly divided into a heater external type, a heater internal type, a heater blower purge type, and a circulating heating regeneration type (Non Purge) according to the air regeneration method.

These drying devices are characterized by different efficiency of use of energy when used under the same conditions.

1 shows a heater exterior type.

As shown in the case of the external exterior type, it is installed at the lower end of the apparatus and passes through the direction switching valve 30 to selectively supply the wet air WA introduced from the outside to the tanks 10 and 20 on the left and right sides, and the inside thereof. Two dehumidification and regeneration tanks (10, 20) for removing the moisture of the wet air (WA) to make the dry air (DA), and two installed in the dehumidification and regeneration tank to discharge the wet steam to the outside during regeneration Pneumatic valve (Safety Valve, 40, 50), a silencer (Purge Muffler, 60) is installed to remove the noise generated during the injection of high pressure air, and the dry air (10 or 20) Four check valves 70 to 73 for preventing mixing of DA) with regeneration air required for regeneration, an electric heater 80 for heating regenerated air, and a control panel for controlling the heater. .

This device is a method of drying the process in which the wet air (WA) is made of dry air (DA) while flowing to the upper end after entering the lower end of the dehumidification tank 10 installed on the left side through the direction switching valve 30 at the lower end ( Drying), a part of the drying air DA is heated while passing through the heater 80, flows into the upper end of the dehumidification tank 20 installed on the right side of the drawing, and then moves to the lower end until the set time. The process of heating is called heating, and the process of cooling the dehumidifying agent heated while the power (or steam valve) of the heater 80 is turned off after heating is called cooling, The time is also set by the set time, in which part of the dry air required for regeneration is wet steam (WA) and is released into the atmosphere.

These processes, when the time is set in advance in the control panel, the drying is switched to the dehumidification tank 20 on the right side, the dehumidification tank 10 on the left side is repeated to continue the regeneration operation.

The energy consumed here is the heat of the heater 80 according to the flow rate of the device and the dry air (DA) required for regeneration. The required heat of the heater 80 requires about 15 kW of compressed air per 1000 m 3 / HR. Regenerated air is consumed by about 8%.

In the drawing, 90 is a 2-way on / off valve, 91 is a reactivating air bleed control valve, 92 is a temperature gauge, and 93 is a pressure gauge. Pressure Gauge and 94 each represent an orifice (the same applies hereinafter).

2 shows a heater built-in type.

As shown, the heater built-in type is almost the same as the configuration and operation of the heater external type described above, but the difference is that the two heaters 80 are inserted into the dehumidification tanks 10 and 20 on both sides, respectively.

In this drying apparatus, two heaters 80 are mounted in the dehumidification tanks 10 and 20 to directly heat the dehumidifying agent. Therefore, the efficiency of energy consumption is somewhat higher than that of the heater external type and the consumption of regeneration air is about 6%. Although less than the external type, since the heater 80 is mounted on the upper parts of the dehumidification tanks 10 and 20, it is difficult to replace the heater 80, so it is not used except for a small air dryer or a gas.

3 shows a heater blower purge type.

As shown, the heater blower purge type is the same as the above-described components of the heater external type, but the difference is that the blower 100 is added.

Drying process of this drying device is the same as the heater external type, but in the case of the heater external type during heating in the regeneration process, a part of the dry air DA is used, but in this method, the blower 100 inhales the atmospheric air. It heats through the heater 80, and when cooling, it uses a part of dry air similarly to a heater exterior type.

Therefore, since this device uses the atmosphere during heating in terms of energy consumption, it requires more heater capacity in consideration of saturated moisture in the atmosphere, plus the amount of heat of saturated moisture, and thus consumes more energy and blower than the heating capacity of the heater external type. There is a disadvantage that power is consumed to rotate the motor of (100).

4 shows a cyclic heating regeneration (Non Purge).

The above-mentioned heater external type, internal heater type, and heater blower purge type consume compressed air at the time of regeneration, but this device circulates compressed air in itself and heats and cools, so there is no consumption of compressed air, but the mechanical configuration is very wrong. That's the way.

That is, the apparatus is provided with a cooler 110 and a separator (Separator 120) on the inlet path of the wet air (WA) flowing into the regeneration tank 20 through the ejector (Ejector, 130).

140 in the figure shows a butterfly valve.

This drying apparatus has a unique mechanical configuration using a cooler (Cooler, 110) to prevent a part of the heat input during heating to be combined with the compressed air at the inlet side, there is an advantage that there is no consumption of compressed air, Compared to the three methods described above, which consumes regenerated air, the dry air has a high disadvantage, and the butterfly valve 140 is forcibly operated to lower the pressure at the inlet side in order to combine the regenerated air with the inlet air. There is a disadvantage that the overall differential pressure generation.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a technical problem thereof is to provide a drying apparatus which reduces energy consumption by maintaining dryness of compressed air without differential pressure without regenerating regenerated air.

1 to 4 is a schematic diagram of a conventional air drying apparatus

5 is a schematic view showing the overall configuration of the present invention

※ Explanation of codes for main parts of drawing

10: dehumidification tank 20: regeneration tank

30,30 ': Directional valve 40,50: Pneumatic valve

60: muffler 70 to 73: check valve

80: heater 90: 2-way valve

91: control valve 92: temperature gauge

93: pressure gauge 94: orifice

100: blower 110,110 ': cooler

120,120 ': Separator 130: Ejector

140: butterfly valve

In order to achieve the above object, the present inventors have conducted a lot of research and efforts on the problem of minimizing the consumption of energy and compressed air required for heating while maintaining the dryness of the compressed air pursued in the adsorptive air drying apparatus. This is actually required by many companies that manufacture air dryers.

That is, if the consumption of energy does not consume the compressed air necessary for the greatest regeneration in the state of maintaining the dryness of the desired compressed air, this will contribute greatly to energy saving as the most ideal way of the adsorption air drying apparatus.

The core of the present invention is that a part of the dry air passed through the dehumidification tank to the regeneration tank by using a blower can be heated with less heat than when using the wet air during heating, the dry air of the dry air as it is during cooling Cooling while maintaining, there is no consumption of dry air required for regeneration can be a big effect on energy saving.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Figure 5 shows a circulation heating regenerative air drying apparatus employing a blower of the present invention.

As shown, the drying apparatus of the present invention is a direction switching valve 30 for selectively supplying the wet air WA introduced from the outside to the left and right dehumidification and regeneration tanks 10 and 20, and the wet air passing through the inside thereof. Two dehumidification and regeneration tanks (10, 20) for removing the moisture of (WA) to make the dry air (DA), and the moisture vapor generated during the regeneration installed in the dehumidification and regeneration tanks (10, 20) to the outside Two pneumatic valves 40 and 50 for discharging, and another directional valve installed on top of the dehumidification and regeneration tanks 10 and 20 to prevent mixing of dry air DA and regeneration air for regeneration. In the circulation heating regenerative air drying apparatus having a 30 ',

A blower (100) for introducing a portion of dry air (DA) discharged from the dehumidification tank (10) toward the regeneration tank (20);

A heater 80 for heating the dry air introduced by the blower;

A cooler (110) for cooling the dry air introduced by the blower;

And a cooler 110 'and a separator 120' for cooling the air passing through the regeneration tank 20 again and supplying it to the ejector 130 at the inlet side.

Since the configuration and operation of the direction switching valve 30, the dehumidification and regeneration tanks 10 and 20, the pneumatic valves 40 and 50, and the direction switching valve 30 'are the same as in the related art, the description thereof will be omitted. Description of the same reference numerals will be omitted.

The blower 100 introduces a part of the dry air DA passed through the dehumidification tank 10 toward the regeneration tank 20, and the heater 80 is controlled by a separate control panel and the dry air introduced by the blower. Will be heated.

In addition, the cooler 110 cools the dry air introduced by the blower 100, and another cooler 110 ′ and the separator 120 ′ return the air having a high humidity while passing through the regeneration tank 20. Cooling, the ejector 130 serves to supply the cooled air to the inlet side.

Referring to the operation and operation of the present invention as described above are as follows.

For convenience of explanation, the tank 10 on the left side will be described as a dehumidification tank and the tank 20 on the right side as a regeneration tank.

Prior to the description, in the conventional circulating heating regenerative type, it is not possible to maintain the dryness of the compressed air as in the case of the heater external type, internal heater type, and heater blower purge type. This is because the dryness of the compressed air is high (bad).

This is the result of the inevitable mechanical configuration of the existing product.

However, according to the present invention, a part of the dry air DA passed through the dehumidification tank 10 is introduced into the regeneration tank 20 by using the blower 100, so that the amount of heat is reduced even when the wet air WA is used during heating. It can be heated and cooled using dry air (DA) during cooling, thus saving energy by eliminating the consumption of dry air required for regeneration while maintaining the dryness of conventional heater external type, internal heater type and heater blower purge type. You can get a great effect.

The following table compares the energy consumption of the conventional circulating heating regenerative air drying apparatus employing the blower of the present invention.

Energy consumption comparison table by method (10.000㎥ / HR in 7.0㎏ / ㎠ state, based on one year)

Item expression Heater external type (dryness -60 degrees Celsius or less) Heater built-in type (dryness -60 degrees Celsius or less) Heater blue war type (dryness -60 degrees Celsius or less) Circulation heating regenerative type (dryness -38 ℃ or higher) Circulation heating regeneration type (non-fuzzy) which adopted blower (dryness -60 degrees Celsius or less) Recycled air Consumption (㎥ / HR) 800㎥ / HR × 24HR × 365 days = 7.008.000㎥ 600㎥ / HR × 24HR × 365 days = 5.256.000㎥ 400㎥ / HR × 24HR × 365 days = 3.504.000㎥ Cost (8 won / ㎥) 7.008.000㎥ × 8 KRW = 56.064.000 KRW 5.256.000㎥ × 8won = 42.048.000won 3.504.000㎥ × 8won = 28.032.000won Electric heater Consumption 120㎾ × 12HR × 365 days = 525.600㎾ 100㎾ × 12HR × 365 days = 438.000㎾ 150㎾ × 12HR × 365 days = 657.600㎾ 180㎾ × 12HR × 365days = 788.400㎾ 140㎾ × 12HR × 365days = 613.200㎾ Cost (65 won / ㎾) 525.600㎾ × 65KRW = 34.164.000KRW 438.000㎾ × 65KRW = 28.470.000KRW 657.000㎾ × 65KRW = 42.705.000KRW 788.400 yen × 65 won = 51.246.000 won 613.200㎾ × 65KRW = 39.858.000KRW Blower power Consumption 37.5㎾ × 12HR × 365 days = 164.250㎾ 22.5 ㎾ × 24HR × 365 days = 197.100㎾ Cost (65 won / ㎾) 164.250 × 65 KRW = 10.676.250 KRW 197.100㎾ × 65KRW = 12.811.500KRW cooling water Consumption (㎥) 25㎥ × 24HR × 365 days = 219.000㎥ 20㎥ × 24HR × 365 days = 175.200㎥ Cost (15 won / ㎥) 219.000㎥ × 15KRW = 3.285.000KRW 175.200㎥ × 15KRW = 2.628.000KRW Total cost (KRW) 90.228.000won 70.518.000 KRW KRW 81.413.250 KRW 54.531.000 55.297.500 KRW

As described above, the present invention installs a blower in a circulating heating regenerative drying apparatus that removes moisture by heating while circulating air supplied at a high pressure or a low pressure, and a part of the air dried while passing through a dehumidification tank by the blower. It was introduced into the regeneration tank.

The present invention is capable of heating with less heat than when using the wet air during heating, while the cooling can prevent the consumption of dry air required for regeneration while maintaining the dry air dryness as it saves energy It is outstanding.

Claims (1)

Directional valve 30 for selectively supplying the wet air WA introduced from the outside to the left and right dehumidification and regeneration tanks 10 and 20, and the dry air by removing the moisture of the wet air WA passing through the inside. Two dehumidification and regeneration tanks (10, 20) made of (DA), and two pneumatic valves (40, installed in the dehumidification and regeneration tanks (10, 20) to discharge the moisture vapor generated during regeneration to the outside 50) and a circulating heating regeneration having another direction switching valve 30 'installed on the dehumidification and regeneration tanks 10 and 20 to prevent mixing of dry air DA with regeneration air required for regeneration. In the air dryer, A blower (100) for introducing a portion of dry air (DA) discharged from the dehumidification tank (10) toward the regeneration tank (20); A heater 80 for heating the dry air introduced by the blower; A cooler (110) for cooling the dry air introduced by the blower; Circulating heating employing a blower, comprising: a cooler 110 'and a separator 120' for cooling the air passing through the regeneration tank 20 again and supplying it to the ejector 130 at the inlet side. Regenerative air dryer.