KR20000001449A - Condensate water collection device and control method thereof - Google Patents

Abstract

PURPOSE: A condensate water collection device and a control method thereof are provided to reduce the energy loss by the reuse of the vent and to reduce the manufacture cost by the simplification of the pipe arrangement. CONSTITUTION: A condensed water collection device comprises:a vent pipe valve(108a) to open and close the steam vented to a collection tank; a vent line(108) installed higher than the maximum water level of the collection tank not to flow into a condensate water tank for the condensed water in the collection tank; and a solenoid typed steam supply valve(107a) to control the opening and closing of the steam electronically by the sensed signal of a water level sensor(106).

Description

Condensate Recovery Device and Control Method

The present invention relates to a condensate recovery device and a control method thereof, when condensate is collected in a condensate tank and the water level rises, the water level level sensor detects this and shuts off the exhaust pipe valve when the water level reaches a predetermined level, and at the same time, opens the steam supply valve to steam By supplying and pressurizing the condensate tank instantaneously, the check valve installed in the condensate discharge pipe is pushed. After the condensate is transferred to the boiler water tank, when the condensate reaches the low water level, the steam supply valve is shut off and the exhaust pipe valve opens. The present invention relates to a condensate recovery device and a control method thereof that are initialized and repeatedly operated.

Conventional condensate recovery apparatuses include a condensate recovery apparatus using the Ogden pump shown in FIGS. 1 and 2B and a condensate recovery apparatus using the water level control pump shown in FIG. 3.

In the condensate recovery apparatus using the Ogden pump shown in Figs. 1 to 2B, when condensate is introduced into the pump 4 and the water level rises, steam or compressed air is supplied, and the condensed water is supplied by the pressure of the supplied steam or compressed air. It works in a similar way to the piston that pushes

When the liquid passes through the strainer 2 from the collection pipe 1 by gravity and flows into the pump 4 through the inlet check valve 3, the float 5 is buoyant to the exhaust valve shaft 6 It comes along.

At this time, the outlet check valve 7 is closed by the outlet back pressure, the steam supply valve 8 is closed by the steam pressure, and the exhaust valve 9 is opened by the weight of the exhaust valve shaft 6. The float 5 rises.

When the float 5 continues to rise and reaches the upper jaw 10 of the exhaust valve shaft 6, the exhaust valve shaft 6 is pushed up to partially close the exhaust valve 9 and at the same time, the steam supply valve 8 is closed. Open

When steam or compressed air is supplied through the steam supply valve 8, the exhaust valve 9 is rapidly completely closed and the steam supply valve 8 is fully open to generate pressure in the pump 4.

At this time, the inlet check valve 3 is closed and a pressure is formed in the pump 4 to overcome the back pressure applied to the outlet check valve 7.

The pressure inside the pump 4 opens the outlet check valve 7 and the discharge starts.

When the float 5 descends with the liquid and the liquid is almost discharged, the lower valve 11 of the exhaust valve shaft 6 is pushed down to close the exhaust valve 9.

Again, the pressure in the pump 4 is extinguished, the outlet check valve 7 is closed by the back pressure, and the inlet check valve 3 is opened to start the inflow of liquid.

In the condensate water recovery device using the water level control pump shown in FIG. 3, the air in the condensate tank 21 installed at atmospheric pressure is introduced through the vent line 28 while the condensate is introduced into the condensate tank 21 through the condensate inlet pipe 23. When the condensate tank 21 is discharged and the level control electrode 26 is installed, when the condensate reaches the control level, the stop valve 24a installed in the condensate discharge pipe 24 is opened to operate the pump 30. By the condensate in the condensate tank 21 is passed through the boiler water tank (not shown in the drawing) is introduced into the condensate inlet pipe 23 to circulate.

At this time, the re-evaporation steam is discharged through the vent line 28 to maintain the pressure in the condensate tank 21.

Reference numeral 25 denotes a water level level display portion, and 29 denotes a pressure gauge.

However, the conventional condensate recovery unit using the Ogden pump and the condensate recovery unit using the water level control pump is a way to collect the condensate in the tank to collect it to be transported to the pump to reuse the condensate in the boiler, The pump was overheated by the high temperature condensate containing, which may cause the motor to malfunction and breakage. Cavitation is generated in the pump, and the motor driving the pump idling causes waste of power and condensate collection. Vented flash steam into the air, causing the loss of steam. In the case of the open condensate collector, water vapor diffuses into the workplace, which degrades the working environment and contaminates the workplace. It was very complicated and susceptible to water hammer impacts. Just as there have been problems such as very expensive.

The present invention was created in order to solve the above problems, when the condensate is collected in the condensate tank, the water level rises when the water level level sensor detects this and shuts off the exhaust pipe valve when the specified water level is reached, and at the same time opens the steam supply valve. By supplying and pressurizing steam into the condensate tank instantaneously, the check valve installed in the condensate discharge pipe is pushed in, while the condensate passes through the injector at its own pressure and inhales the steam in the steam collecting part to maintain the vacuum in the steam collecting part. By minimizing the internal pressure of the condensate, not only can the condensate be recovered smoothly, but also the flash steam is recovered together with the condensate, transferred to the boiler water tank, and then flowed back into the condensate collection tank. To shut off and exhaust pipe valve open to recover. By a without the need for pumps By automatic operation condensate recovered as it as its object to provide a condensate recovery system, and a control method that can be reused.

1 is a block diagram of a condensate recovery unit using an Ogden pump

FIG. 2A is a first operation diagram of the Ogden pump shown in FIG. 1. FIG.

FIG. 2B is a second operation diagram of the Ogden pump shown in FIG. 1

3 is a block diagram of a condensate recovery unit using a water level control pump

4 is an overall configuration of the present invention

5 is an internal cross-sectional view of the exhaust pipe valve which is an air pressure check valve of FIG.

6 is a control circuit diagram of FIG.

7A is a temporary view of the present invention

FIG. 7B is a side view of FIG. 7A

FIG. 8 is a control circuit diagram of FIG. 7A

9A is another embodiment of the present invention

FIG. 9B is an enlarged view of portion A of FIG. 9A

10 is another embodiment.

<Description of the symbols for the main parts of the drawings>

1: collection pipe 2: strainer

3: inlet check valve 4, 30: pump

5: float 6: exhaust valve shaft

7: outlet check valve 8: steam supply valve

9: exhaust valve 10: upper jaw

11: lower jaw 21, 101: condensate tank

23, 103: condensate discharge pipe 24, 104: condensate discharge pipe

24a: stop valve 25, 105: level indicator

26: level control electrode 27: safety valve outlet

28, 108: vent line 29: pressure gauge

109: pressure gauge 102: collection tank

102a: steam collector 102b: plate plate

103a, 103a ': Swing check valve 104a: Disc check valve

106: water level sensor 107: booster steam line

107a: Steam supply valve 107b, 108b: Time stop valve

108a, 108a ': Exhaust Pipe Valve 108c: Jaw

108d: Flow opening and closing 108e: Home

109: safety valve 110: gas / water separator or steam trap

111, 111a: condensate recovery pipe 112: injector

113: sprayer 114: stop valve

201: power switch 202: power indicator

203: water level controller 204, 204a, 204b: timer

205: relay

Hereinafter, with reference to the accompanying drawings will be described in more detail the configuration and operation of the present invention.

Figure 4 is an overall configuration of the present invention, Figure 5 is an internal cross-sectional view of the exhaust pipe valve of the air pressure check valve of Figure 4, Figure 6 is a control circuit diagram of Figure 4, Figure 7a is a temporary view of the present invention, Figure 7b is a figure 7A is a side view, FIG. 8 is a control circuit diagram of FIG. 7A, FIG. 9A is another embodiment of the present invention, FIG. 9B is an enlarged view of a portion A of FIG. 9A, and FIG. 10 is another embodiment.

4 is a condensate tank 101 for storing condensate, a collection tank 102 for collecting and collecting condensate, and a conduit for introducing condensate from the collection tank 102 to the condensate tank 101. The condensate inlet pipe 103, the condensate discharge pipe 104 which is a conduit for transferring condensate in the condensate tank 101 to the collection tank 102, and the condensate in the condensate tank 101 can be visually checked. The water level level display section 105 installed inside the condensate discharge pipe 104, the water level level sensor 106 installed inside the water level display section 105, and steam from the outside into the condensate tank 101. The booster steam line 107, which is a steam suction pipe path for forcibly increasing the pressure in the condensate tank 101 by forced suction, and the steam in the condensate tank 101 are discharged to the collection tank 102 to be in the condensate tank 101. Steam installed to relieve pressure Vent line 108, which is an outlet pipe, and a condensate return pipe 111, a gas / water separator or steam trap 110, and a condensate tank 101, which are inflow pipes of condensate recovered to the collection tank 102, It is composed of an injector 112 to recover the condensate discharged along the 104 and the flash steam in the collection tank and sprayed toward the boiler water tank (not shown).

In the above, the non-load swing check valve 103a (103a ') is installed on the condensate inlet pipe 103 to prevent the backflow of the condensate flowing into the condensate tank 101 and minimize the inlet resistance. In order to prevent malfunction of the water level level sensor 106 due to fluctuations in the condensate inflow and mixing of the flowing water, the condensate discharge pipe 104 may be installed.

On the condensate discharge pipe 104, a disk check valve 104a is installed to prevent backflow of condensate discharged from the condensate tank 101 toward the condensate collection tank 102 and to maintain airtightness. It is good to install the water level sensor 106 in a position capable of detecting the water level.

On the booster steam line 107, a solenoid type steam supply valve 107a controlled by a control circuit for controlling the opening and closing operation of the forcedly sucked steam along the booster steam line 107 is installed.

In addition, the exhaust line valve 108a, 108a ', which is an air pressure two-stage check valve, is installed on the vent line 108, and the steam discharged from the condensate tank 101 to the collection tank 102 is exhaust pipe valve 108a. ), The discharge of steam discharged from the condensate collection tank 102 to the condensate return pipe 111a can be automatically controlled according to the pressure in the condensate tank 101 by the exhaust pipe valve 108a '.

The water level level sensor 106 is not installed in the condensate tank 101, but is installed on the condensate discharge pipe 104 to prevent malfunction due to steam or condensate fluctuations in the condensate tank 101. The tank 102 is formed with a steam collector 102a integrally formed with the collection tank 102 to collect steam discharged from the condensate tank 101, and a plurality of plate plates 102b are formed therein. The staggered parallel arrangement is such that steam discharged from the re-evaporation is condensed on the surface of the plate plate 102b to be recovered to the collection tank.

The air pressure type two-stage check valve has a cross-sectional shape as shown in FIG. 5, and when the operation is below a certain pressure, the jaw 108c portion and the upper portion of the flow opening and closing opening 108d are slightly spaced apart from each other. Steam can be discharged to the outside through the groove (108e), when the predetermined pressure is more than the upper end of the flow opening (108d) in close contact with the jaw (108c) is configured to prevent the steam is discharged.

Vent line 108 is configured to communicate with each other in the condensate tank and the collection tank to discharge steam from the condensate tank 101 to the collection tank 102, the steam discharged from the condensate tank side from the condensate tank side to the collection tank side It has an exhaust pipe valve (108a), which is an air pressure type two-stage check valve to open and close the discharge by atmospheric pressure, and is configured so that its end is positioned higher than the maximum water surface in the collection tank so that condensate in the collection tank does not flow into the condensate tank. The booster steam line 107 has a solenoid type steam supply valve 107a which can electronically control the opening / closing operation of steam forcedly sucked from the outside by the detection signal of the water level level sensor 106.

The collection tank 102 is formed in parallel with each other so that the steam collecting unit 102 for storing the steam discharged from the condensate tank 101 into the collecting tank 102 and the space inside the steam collecting unit to form a curved shape. It has a plate plate (102b), the condensate discharge pipe 104 is formed to be parallel to the condensate tank 101, a portion of the conduit tank level, the water level level display portion 105 to check the water level in the condensate tank in the parallel portion ) And a level sensor 106 for detecting the level.

The injector 112 is connected to a conduit drawn out from the condensate discharge pipe 104 and the steam collecting unit 102a and uses the pressure of the condensate discharged from the condensate tank 101 to re-evaporate steam in the steam collecting unit 102a. Since a vacuum is formed by the condensate return pipe 111a, the atomizer 113 is drawn out of the conduit between the disc check valve 104a and the injector on the condensate discharge pipe 104 to spray the condensed water into the steam collector 102a. Thereby minimizing flash steam.

The operation of the present invention having the above configuration will be described with reference to a control circuit diagram for controlling the condensate recovery device which is the device of the present invention shown in FIG.

When the power switch 201 is turned on, the power indicator 202 is turned on, and the power level of the level controller 203 is turned on while the level detected by the level sensor 106 is lower than or equal to the designated level. In this case, the exhaust pipe valve 108a is opened and the steam supply valve 107a is closed and initialized.

Since the initial pressure is low in the condensate tank 101, the exhaust pipe valve 108a, which is an air pressure two-stage check valve, is opened so that steam containing the steam in the condensate tank 101 is collected along the vent line 108. Steam and condensate are separated while passing through the plate plate 102b formed at the steam collecting unit 102a of 102, and the condensate is recovered to the condensate collection tank 102. Through the 108a 'and the injector 112 is discharged for a set time to the condensate recovery pipe (111a), the steam along the vent line 108 is collected in the steam collector 102a of the collection tank 102 and at the same time The air pressure in the tank 101 is lower than atmospheric pressure so that the condensed water recovered into the collection tank 102 along the condensed water collection pipe 111 is smoothly introduced into the condensed water tank 101 along the condensed water inlet pipe 103.

When the water level in the condensate tank 101 rises over time and reaches the designated level, the water level sensor 106 detects this and turns on the switch S1 by turning on the E1 and E3 contacts of the water level controller 203 momentarily. (ON) to activate the timer 204 and the relay 205.

At this time, the switch S2 forms a self-holding circuit by the relay 205, S3 is turned ON, the steam supply valve 107a is opened by the switch S3, and the set time is set by the timer 204. Time switch T1 is turned OFF.

As the steam flows into the condensate tank 101 rapidly, the pressure in the condensate tank 101 becomes instantaneously very large and closes the exhaust pipe valve 108a, which is an air pressure type two-group check valve, through the collection line through the vent line 108. The movement of steam collected by the 102 is blocked and at the same time, the condensate inside the condensate tank 101 pushes out the disk check valve 104a in the condensate discharge pipe 104 and is discharged and is injected through the injector 112.

At this time, the steam collected in the steam collector 102a of the condensate collection tank 102 by the discharge pressure of the condensate discharged through the injector 112 is discharged along the injector 112 like the condensate.

Condensed water containing steam injected through the injector 112 is condensed water through the mixing pipe (not shown) is recovered in the boiler water tank (not shown).

When the water level reaches the low level after the set time, the power to the timer 204 and the relay 205 is cut off, and the relay 205 turns off the switches S2 and S3 to close the steam supply valve 107a, and the timer At 204, the time switch T1 is turned on to be reduced to an initial state in which condensate is re-introduced into the condensate tank 101, thereby repeating the condensate recovery operation.

7A and 7B are condensate tank 101 for storing condensate, a collection tank 102 for collecting and collecting condensate, and a conduit for introducing condensate into the condensate tank 101 from the collection tank 102. The condensate inlet pipe 103, the condensate discharge pipe 104 which is a conduit for transferring condensate in the condensate tank 101 to the collection tank 102, and the condensate in the condensate tank 101 can be visually checked. It is connected to the water level level display unit 105 installed on the side of the condensate tank 101, the water level level sensor 106 installed in the upper portion of the condensate tank 101, and the upper side of the condensate tank 101, Booster steam line 107, which is a steam suction pipe path for forcibly sucking steam from the outside to temporarily increase the pressure in the condensate tank 101, and discharges the steam in the condensate tank 101 to the outside, thereby Booster to lower the pressure The vent line 108, which is a steam discharge pipe line installed on the condensate tank 101 side of the steam line 107, and a pressure gauge 109 and a condensate collection tank for displaying or adjusting the pressure in the condensate tank 101 ( 102 and the steam separator 110 installed on the conduit between the booster steam line 107, and on the condensate inlet pipe 103 to prevent the backflow of condensate flowing into the condensate tank 101 and A non-load swing check valve 103a is provided to minimize inlet resistance, and a disc for preventing backflow of condensate discharged from the condensate tank 101 to the condensate collection tank 102 and maintaining airtightness on the condensate discharge pipe 104. The check valve 104a is installed, and a booth is sequentially installed from the condensate tank 101 side on the pipeline connected between the gas / water separator or the steam trap 110 on the booster steam line 107 and the condensate tank 101. The solenoid type steam supply valve 107a and the time stop valve 107b controlled by the control circuit for controlling the opening and closing operation of the forcedly sucked steam along the rotor steam line 107 are provided, The solenoid type exhaust pipe valve 108a and the time stop valve 108b, which are sequentially controlled from the condensate tank 101 side by the control circuit, are also provided on the 108 to control the opening and closing operation of steam discharged from the condensate tank 101. It is configured to do so.

Referring to the control circuit diagram shown in Fig. 8, the operation of the invention shown in Figs. 7A and 7B is turned on, and the power indicator 202 is turned on at the same time as the power level switch 201 is turned on. When the power level of the controller 203 is turned on and the water level detected by the water level level sensor 106 is lower than or equal to the predetermined level, the exhaust pipe valve 108a is opened and the steam supply valve 107a is closed and initialized.

When the exhaust pipe valve 108a is opened, the air containing the steam in the condensate tank 101 is discharged along the vent line 108 so that the air pressure in the condensate tank 101 is lowered to collect the tank along the condensate return pipe 111. 102, the condensate is recovered along the condensate inlet tube 103, and at the same time the steam in the collection tank 102 is separated from the condensate and gas condensate is stored in the collection tank 102, when the condensate discharge is finished The pressure of the condensate tank 101 is reduced to atmospheric pressure again to flow into the condensate tank 101.

When the water level in the condensate tank 101 rises and reaches the designated level over time, the water level sensor 106 detects this and turns on the switch S1 by turning on the E1 and E3 contacts of the water level controller 203. The timer 204a, 204b and the relay 205 are operated to be turned on, and the switch s2 is turned on and self-held by the relay 205, and the switch S3 is turned off to be turned off. The vent line 108 is closed by closing 108a, and the time switch T1 is turned on by the timer 204a after 2 to 3 seconds by the timer 204a to open for a set time by the timer 204b. Steam is forcibly supplied into the condensate tank 101 through the booster steam line 107. Accordingly, the pressure inside the condensate tank 101 is increased so that the condensate inside the disc check valve 104a in the condensate discharge pipe 104 is discharged. Condensate return pipe (111) Through, and so it returned to the boiler water tank,

While operating for a set time, the time switch T1 is turned off to cut off the power of the timer 204a and the relay 205. The relay 205 turns off the switch S2 to close the steam supply valve 107a, and the switch By turning on S3, the exhaust pipe valve 108a is opened to be an initial state in which condensed water is re-introduced into the condensate tank 101.

9A is a temporary view of the present invention, unlike the invention of FIGS. 7A and 7B, the water level level sensor 106 is installed inside the water level level display unit 105 to be installed inside the condensate tank 101. The operation rate of 106 is reduced, and only the time stop valves 107b and 108b are installed on the booster steam line 107 and the vent line 108 pipeline, and the solenoid valve exhaust valves in FIGS. 108a) is omitted.

In addition, the condensate tank 101 is lengthened in the longitudinal direction to reduce the installation area and the water pressure received per unit area is increased as the height is increased so that the condensate can be discharged easier to obtain the effect.

10 is another embodiment of the present invention, as shown in FIG. 9A, the condensate tank 101 is vertically lengthened, and unlike the invention shown in FIGS. 7A, 7B, and 9A, the vent line ( 108) The time stop valve 108b as shown in FIGS. 7A and 7B is omitted from the conduit, and the condensate discharged from the condensate discharge pipe 104 passes through the boiler water tank (not shown) to the condensate collection tank 102. When it is re-introduced, the condensate recovery pipe 111 is separated into several pieces.

The effect obtained by using the present invention described above is that the steam is automatically detected by applying a signal to the solenoid valve when the water level is detected by the water level level sensor without using a pump that transfers the condensate to the condensate tank. By forcibly supplying condensed water to the condensed water, the condensed water recovery device malfunctions and breaks due to the overheating of the conventional pump and the idling of the motor can be solved, the power consumption can be reduced, and the structure is simple. This can reduce the production cost.

Claims (6)

A condensate tank for storing condensate, a collection tank for collecting and collecting condensate, a condensate inlet pipe that is a conduit for introducing condensate from the collection tank to the condensate tank, and a conduit for conveying the condensate inside the condensate tank to a collection tank. Condensate discharge pipe, water level level indicator (water gauge or glass) to check the water level of the condensate in the condensate tank, a water level sensor for detecting and signaling the water level, booster steam line that is a pipeline for sucking steam into the condensate tank And a vent line for discharging the steam in the condensate tank to the outside, a pressure gauge for displaying or controlling the pressure in the condensate tank, and a gas / water separator for separating condensate and gas. , In order to discharge steam from the condensate tank 101 to the collection tank 102, the condensate tank and the collection tank is configured to communicate with each other, the discharge of the steam discharged from the condensate tank side to the collection tank side on the pipeline by the atmospheric pressure A vent line 108 having an exhaust pipe valve 108a which is an air pressure type two-stage check valve and having an end portion higher than the maximum water surface in the collection tank so that condensed water in the collection tank does not flow into the condensate tank; A booster steam line 107 having a solenoid type steam supply valve 107a for electronically controlling the opening / closing operation of steam forcedly sucked from the outside by the detection signal of the water level level sensor 106; Steam collecting unit 102 for storing the steam discharged from the condensate tank 101 into the collection tank 102, and the plate plate 102b formed parallel to each other so that the space inside the steam collecting unit to form a curved shape A collection tank having a; A portion of the conduit is formed to be parallel to the condensate tank 101, but in the parallel portion, the water level level indicator 105 for checking the level in the condensate tank and the level sensor 106 for detecting the level are provided. A condensate discharge tube 104; An injector connected to the conduit drawn out from the condensate discharge pipe 104 and the steam collecting unit 102a and discharging the condensate and steam in the steam collecting unit 102a discharged from the condensate tank 101 to the condensate collecting pipe 111a ( 112); And a sprayer (113) for drawing condensed water into the steam collector (102a) by drawing it out of the conduit between the disc check valve (104a) on the condensate discharge pipe (104) and the injector. The method of claim 1, The exhaust pipe valves 108a and 108a ', which are air pressure check valves, are integrally formed at the inner circumference of the exhaust pipe valve 108a and 108a'. Condensate recovery device, characterized in that consisting of a flow opening and closing (108d) for controlling the discharge of steam discharged through the groove (108e). The method of claim 1, A power switch 201; A power indicator 202 flashing by the power switch 201; A water level level controller 203 for controlling the switch S1 to control the opening / closing operation of the steam supply valve 107a by the detection signal of the water level level sensor 106; A relay 205 for controlling the switch S2 and the switch S3 to open and close the steam supply valve 107a; A condensate recovery device comprising a control circuit comprising timers 204a and 204b for closing the steam supply valve 107a by controlling the time switch T1 after a predetermined time after the opening and closing operation of the steam supply valve 107a. . The method of claim 1, On the booster steam line 107, a time stop valve 107b is added to automatically control the opening and closing operation of the forcedly sucked steam along the booster steam line 107, and the exhaust pipe valve 108 on the vent line 108 is added. The solenoid type exhaust pipe valve 108a and the time stop valve 108b, which are electronically controlled, are installed instead of the air pressure type two-stage check valve, and at the same time, the steam supply valve 107a is detected by the detection signal of the water level sensor 106. A water level level controller 203 for controlling the switch S1 to control the opening and closing operations of the exhaust pipe valve 108a and the type stop valves 107b and 108b; A relay 205 for controlling the switch S2 and the switch S3 to open and close the steam supply valve 107a and the exhaust pipe valve 108a; And a steam supply valve (107a) and an exhaust pipe valve (108a) comprising a control circuit comprising timers (204a, 204b) for controlling the time switches T1 and T2. The method according to claim 1 or 3, When the water level in the condensate tank 101 reaches the specified level, the water level sensor 106 detects this and turns on the switch S1 by turning on the E1 and E3 contacts of the water level controller 203. The timer 204 and the relay 205 to operate, the switch S2 is self-maintained by the relay 205, S3 is turned on, and the steam supply valve 107a is opened to instantly boost steam. 107 is forcibly supplied into the condensate tank 101, and thus the pressure inside the condensate tank 101 is increased so that the condensate is discharged while pushing the disk check valve 104a in the condensate discharge pipe 104 to collect condensate. The flash steam of the tank 102 is sucked into the injector 112 and introduced into the boiler water tank through the condensate recovery pipe 111a. The timer 204 and the relay 205 are turned off by operating the set time and turning off the contact of the timer T. The relay 205 turns off the switches S2 and S3 to turn off the steam supply valve ( The control method of the condensate recovery device characterized in that for closing the 107a) to reduce the condensate into the initial state that the condensate is re-introduced into the condensate tank (101). The method of claim 4, wherein When the water level in the condensate tank 101 reaches the specified level, the water level sensor 106 detects this and turns on the switch S1 by turning on the E1 and E3 contacts of the water level controller 203. The timer 204a, 204b and the relay 205 are operated, and the switch S2 is turned ON and self-holding by the relay 205, and the switch S3 is turned OFF to close the exhaust pipe valve 108a. As a result, the vent line 108 is closed, and the steam switch is momentarily boosted by the time switch T1 being turned on by the timer 204a and the time switch T1 being turned on for a set time by the timer 204b. Forced supply into the condensate tank 101 through the line 107, thereby increasing the pressure inside the condensate tank 101 so that the condensate is discharged while pushing the disk check valve 104a in the condensate discharge pipe 104 and circulated Boiler water through the condensate return pipe (111) And so that the number of croissant, While operating for a set time, the time switch T1 is turned off to cut off the power of the timer 204a and the relay 205. The relay 205 turns off the switch S2 to close the steam supply valve 107a, and the switch The control method of the condensate recovery device characterized in that the S3 is turned on to open the exhaust pipe valve (108a) to be reduced to the initial state in which the condensate is re-introduced into the condensate tank (101) to be circulated.