KR102312086B1 - The condensated water feeder of boiler - Google Patents

Abstract

The present invention relates to a condensate water supply device of a boiler, capable of supplying condensate water to a boiler at high pressure, which comprises: a pump (55) for pumping condensate water (54); a condensate water circulation pipe (58); a condensate water recovery pipe (59) for recovering the condensate water (54); a first check valve (61) for preventing the backflow of the condensate water (54); a second connection pipe (64); a condensate water supply pipe (66); an electric valve (65) for opening and closing a flow path; a second ejector (67); a water level sensor (70); and a control unit (71).

Description

The condensed water feeder of boiler

The present invention relates to a boiler for heating water to generate high-pressure steam and supplying it to a heat exchanger, and more particularly, to a boiler condensed water that is stably supplied to the boiler by recovering a large amount of condensed water generated in the heat exchanger within a short time. It's about the supply.

In general, high-pressure steam obtained by heating water is widely used in various fields such as indoor heating, laundry, sewing factory, and cooking area, and such steam is usually obtained by a steam boiler.

1 is a longitudinal cross-sectional view showing the main part of Patent No. 613397, which is a conventional device. A steam supply pipe 3 is installed on the upper part of the boiler 1, and a heat exchanger 4 is connected to the end of the steam supply pipe 3 The other end of the heat exchanger is connected to a condensate recovery pipe 5 for recovering the condensed water generated as the steam 22 undergoes heat exchange in the heat exchanger. At this time, a trap 6 is installed on the condensate recovery pipe installed.

And the condensate collection tank 8 with a float switch 7 is connected to the end of the condensate collection pipe 5, and on the connection pipe 9 connected to one side of the condensate collection tank, the condensate collection tank 8 As the float switch 7 senses that the water level is above the set water level, the condensate recovery pump 12 that operates by driving the motor 10 to pressurize the condensed water in the condensate collection tank 8 to the make-up water tank 11 is installed. A check valve 14 is installed on the connection pipe 9 to prevent the reverse flow of the condensate 13 in the condensate collection tank 11 to the condensate collection tank 8 side.

In addition, on one side of the boiler (1), a make-up water tank (11) for supplying the condensed water (13) recovered through the connection pipe (9) to the inside of the boiler (1) is provided on one side of the boiler (1) without a head difference. They are installed side by side, and an automatic water level sensor 15 for detecting the water level of the condensate 13 located inside the boiler is installed on one side of the boiler 1 .

The compressed air supply pipe 16 is connected to the upper part of the make-up water tank 11 installed on one side of the boiler 1 without a head difference with the boiler 1, and the make-up water tank 11 is connected to the other end of the compressed air supply pipe. ), a compressor (19) for generating compressed air (18) is installed by driving the automatic pressure control switch (17) installed in the sensor according to the detection that the pressure is below the set pressure.

In addition, the condensed water in the make-up water tank 11 is supplied to another boiler (not shown) on the condensed water supply pipe 20 that supplies the condensed water 13 in the make-up water tank 11 to the inside of the boiler 1 A preliminary valve 21 for branching is further provided.

Therefore, when the steam 22 is generated by the operation of the boiler 1, the generated steam 22 is supplied to the heat exchanger 4 along the steam supply pipe 3 to perform heating and some steam is transferred to a separate steam pipe. supplied through

In this process, when the steam is changed to the condensate 13 by heat exchange, the wet steam is removed from the trap 6 in the process of being recovered to the condensate collection tank 8 through the condensate recovery pipe 5 .

When the condensate 13 is filled in the condensate collection tank 8 and the float switch 7 detects that the water level is higher than the set water level, power is automatically applied to the motor 10 and the condensate recovery pump 12 is operated, so the condensate collection tank The condensed water 13 inside is recovered to the make-up water tank 11 side through the connection pipe 9 .

In this way, after the condensed water 13 is recovered to the make-up water tank 11, the high-pressure compressed air (higher than the vapor pressure in the boiler) generated by the operation of the compressor 19 is compressed air in the upper part of the make-up water tank 11. It is acting through the supply pipe 16, and the drive of the compressor 19 is sensed by the automatic pressure control switch 17 installed on the top of the make-up water tank 11, and the pressure in the make-up water tank 11 is adjusted to the boiler (1). ), the operation of the compressor 19 is temporarily stopped if it is higher than the steam pressure in the Since the compressor 19 is driven again until it is detected that the pressure in the water tank 11 is higher than the steam pressure in the boiler 1, the pressure in the make-up water tank 11 is always higher than the steam pressure in the boiler 1 status will be maintained.

In this state, when the automatic water level sensor 15 detects that the water level of the condensed water 13 in the boiler is lower than the set water level due to the continuous operation of the boiler 1 in this state, the solenoid valve 23 installed on the condensate supply pipe 20 is Since it is opened, the condensed water in the make-up water tank 11 is filled into the inside of the boiler (1). Since the pressure of compressed air higher than the steam pressure in the boiler 1 is applied to the upper part of the tank 11 , the condensed water in the make-up water tank 11 is filled into the boiler 1 through the condensed water supply pipe 20 .

Republic of Korea Patent Publication No. 10-613397 (Registered on Aug. 9, 2006) Republic of Korea Patent Publication No. 10-1141438 (Registered on April 23, 2012)

However, in this conventional device, if the wet steam contained in the condensate is not removed, the pressure in the condensate recovery pipe 5 is high, so that the condensate 13 is not recovered by gravity toward the condensate collection tank 8, so each condensate pipe (5) Although an expensive trap 24 is installed on the top to remove the wet steam contained in the condensate 13, even if an expensive trap is installed, the parts constituting the trap due to high temperature and high pressure condensate or impurities contained in the condensate are not installed. Corrosion causes high-temperature, high-pressure condensate and steam to escape to the outside, so there is a problem in use that requires frequent replacement of expensive traps.

In addition, in the no trap type that does not use a trap, high-temperature and high-pressure steam is discharged into the atmosphere to drop the pressure in the condensate collection tank, and the condensate generated in the heat exchanger is recovered to the condensate collection tank.

However, in this system, as the pressure of the condensate collection tank is forcibly reduced, the condensate generated in the heat exchanger is smoothly recovered to the condensate collection tank. also falls together, so at normal pressure, condensate exists as condensate in the condensate collection tank. That is, the condensed water is vaporized to a temperature at which it exists as water and is reduced.

As such, when the pressure in the condensate collection tank drops below the set pressure and the pump is driven to pump the condensate while the condensate level is reduced, cavitation damage occurs in the pump, resulting in fatal consequences of damage to the motor of the pump. .

Therefore, since the low water level of the condensate collection tank must be set higher than necessary to prevent cavitation damage to the pump, the condensate collection tank is designed higher than necessary.

The present invention has been devised to solve such a problem in the prior art, and it is an object of the present invention to remarkably improve the structure so that a large amount of condensed water can be stably recovered and supplied to the boiler with the capacity of the same pump.

Another object of the present invention is to discharge the high-pressure saturated steam contained in the condensate to the outside, recover it together with the condensate without dropping the pressure, and recycle it, so that the cost of operating the boiler can be significantly reduced.

According to the aspect of the present invention for achieving the above object, the upper and lower tanks installed to be connected through at least one or more first connection pipes, and the lower tank are connected to the discharge side to pump condensed water according to the driving of the motor. a pump, a condensate circulation pipe installed on the discharge side of the pump and provided with a first ejector, the discharge part being located inside the upper tank; , a first check valve installed in the condensed water recovery pipe to prevent a reverse flow of condensed water, a second connection pipe connected to the upper tank and provided with a second check valve to supply condensed water or steam to the boiler, and the condensed water circulation A condensate supply pipe having one end fixed to pass through the lower end of the first ejector provided in the pipe and the other end being connected to the second connection pipe to supply condensed water to the boiler, and the condensate water quantity in the upper and lower tanks installed in the condensate supply pipe A second ejector installed at the connection point of the electric valve for opening and closing the flow path according to the and a water level sensor installed in the upper and lower tanks to detect the amount of condensed water, and a control unit for controlling the operation of a motor or electric valve as the water level sensor detects the amount of condensed water. A condensate water supply device is provided.

In the present invention, when a certain amount of condensed water is recovered in the upper tank by driving the pump, the electric valve installed in the condensate supply pipe is opened to supply some condensed water circulating in the upper and lower tanks to the boiler by driving the pump. 2 As it passes through the ejector, the pressure of the condensate is dropped to supply the condensate and steam in the upper tank at the same time, so even if a pump of the same capacity is used, the condensed water can be supplied to the boiler at high pressure.

In addition, as a part of the condensed water passes through the first ejector installed in the condensate circulation pipe by driving the pump and the pressure is dropped, a large amount of condensed water that has passed through the heat exchanger is recovered to the upper tank, and the condensate supply pipe as well as the second connection Since it is possible to supply to the boiler side through the tube, an effect of increasing the efficiency by about 30% or more compared to the conventional apparatus can also be expected.

1 is a longitudinal sectional view showing the main part of Patent No. 613397, which is a conventional device;
2 is a block diagram showing an apparatus of the present invention;

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily implement them. The present invention may be embodied in several different forms and is not limited to the embodiments described herein. It is noted that the drawings are schematic and not drawn to scale. Relative dimensions and proportions of parts in the drawings are shown exaggerated or reduced in size for clarity and convenience in the drawings, and any dimensions are illustrative only and not limiting. In addition, the same reference numerals are used to indicate like features to the same structure, element, or part appearing in two or more drawings.

2 is a block diagram showing an apparatus of the present invention, in which the upper and lower tanks 50 and 51 are installed to be passed through at least one or more first connecting pipes 52, and the lower tank 51 A pump 55 for pumping the condensed water 54 according to the driving of the motor 53 is connected to the discharge side of the .

At this time, an air bubble inflow prevention plate 56 having a plurality of through holes 56a formed on the discharge side of the lower tank 51 is further installed, which is condensed water in the lower tank 51 by driving the pump 55 . Even if the pump 54 is pumped to the low water level, a part of the gas (steam) in the lower tank 51 does not flow into the pump 55 side due to a vortex phenomenon, thereby preventing cavitation damage to the pump 55 from occurring it is for

And the condensate circulation pipe 58 provided with the first ejector 57 is installed on the discharge side of the pump 55, so that the discharge part is the condensate circulation pipe 58 is located in the upper tank 50, and the 1 A condensed water recovery pipe 59 for recovering the condensed water 54 is installed on one side of the ejector 57 .

A suction control valve 60 for controlling the recovery amount of the condensed water 54 is installed in the condensed water recovery pipe 59 , and a first check valve for preventing the recovered condensed water from flowing backward at one side of the suction control valve 60 . (61) and a filter (62) for filtering out foreign substances in the condensed water are provided in order.

A second connection pipe 64 for supplying condensed water or steam to the boiler is connected to the upper tank 50, and the condensed water supplied to the boiler does not flow back to the upper tank 50 to the second connection pipe 64. A second check valve 63 is provided.

At the lower end of the first ejector 57 provided in the condensed water circulation pipe 58, the condensed water ( 54) is fixed through one end of the condensed water supply pipe 66 for supplying it to the boiler (not shown), and a second connecting pipe 64 is connected to the other end of the condensed water supply pipe 66, their connection points As the condensed water 54 passes through the condensed water supply pipe 66 , a second ejector 67 is installed to drop the pressure of the condensed water so that the condensed water or steam in the upper tank 50 is supplied to the boiler.

A condensate discharge blocking plate 68 is further installed on the discharge side of the upper tank 50 .

In addition, before driving the device of the present invention to the upper tank 50, the air in the upper tank 50 is discharged to the outside so that the cavitation phenomenon does not occur in the pump 55. An air discharge valve 69 is further provided. It is available.

A water level sensor 70 for detecting the amount of condensed water 54 is installed in the upper and lower tanks 50 and 51. As the water level sensor 70 detects the amount of condensed water 54, the control unit A reference numeral 71 is configured to control the driving of the motor 55 or the electric valve 65 .

A motorized valve on sensor 70a is installed in the water level sensor 70 to be located in the upper tank 50, and a motorized valve off sensor 70b is installed in the lower tank 51, and the motorized valve off sensor ( On and off sensors 70c and 70d for controlling the driving of the motor 53 are sequentially provided below the 70b.

In the drawings, reference numeral 72 denotes a third check valve that is installed on the condensate supply pipe and prevents the supplied condensate from flowing backward, and reference numeral 73 denotes a coupling that transmits the power of the motor 53 to the pump side.

The operation of the present invention will be described as follows.

First, when power is applied, the air discharge valve 69 is opened before the motor 53 is driven to discharge the air remaining in the upper tank 50 to the outside, so that cavitation occurs when the pump 55 is driven. will be prevented in advance.

In this state, when the motor 53 is driven to drive the pump 55 connected by the coupling 73, when the condensed water 54 in the lower tank 51 is pumped through the condensed water circulation pipe 58, the first ejector ( 57), the pressure of the condensed water 54 is reduced, so the condensed water generated while passing through the heat exchanger is recovered through the condensed water recovery pipe 59, and the condensed water recovery pipe 59 is connected to the first ejector 57. The condensed water recovered by being connected is recovered to the upper tank 50 side through the condensate circulation pipe 58 .

At this time, the condensed water 54 in the upper tank 50 is located below the motor-driven valve on sensor 70a, so the motor-driven valve 65 installed in the condensed water supply pipe 66 maintains a closed state, and Since the condensed water 54 passes through the through-holes 56a of the air bubble inflow prevention plate 56, the phenomenon of air inflow to the pump 55 is prevented.

Condensed water 54 in the upper and lower tanks 50 and 51 is circulated through the condensate circulation pipe 58 by the continuous driving of the pump 55, and the condensed water is recovered through the condensed water recovery pipe 59, and the upper tank 50 ), the control unit 71 detects this and opens the motorized valve 65 installed in the condensate supply pipe 66 when the motorized valve on sensor 70a located in the 54) as described above, while passing through the first ejector 57 installed in the condensate circulation pipe 58, the pressure of the condensed water is reduced to recover the condensed water, and a part of the condensed water is returned to the boiler through the condensed water supply pipe 66. is supplied

At this time, since the condensed water 54 supplied to the boiler through the condensed water supply pipe 66 passes through the second ejector 67 at a high speed and drops the pressure, the lift can be maximally increased with the capacity of the same pump 55 . will expect

As described above, the electric valve 65 is opened to supply the condensed water 54 in the lower tank 51 to the boiler, so that the pressure in the upper tank 50 is lowered. 59) through the upper tank 50, and in this case, foreign substances contained in the condensed water 54 are filtered by the filter 62 installed in the condensed water recovery pipe 59, and the recovered condensate is removed. 1 The reverse flow phenomenon is prevented by the check valve (61).

With the same operation as described above, the pump 55 of the same capacity is driven to recover a larger amount of condensed water 54 at the same time. When it is supplied to the boiler through the supply pipe 66, the second check valve 63 is installed on the second connection pipe 64, so that the pressure of the condensed water is reduced while passing through the second ejector 67, so the upper tank ( The condensed water 54 recovered to the inside of 50) is supplied to the boiler together through the second connection pipe 64, and accordingly, a larger amount of condensed water can be recovered and supplied to the boiler at the same time.

However, when the condensate in the lower tank 51 is supplied to the boiler by driving the pump 55, the amount of condensed water recovered to the condensate recovery pipe 59 is reduced, so that the water level of the condensed water in the upper and lower tanks 50 and 51 is reduced. When the motorized valve off sensor 70b in the lower tank 51 is reached, the control unit 71 detects this and automatically closes the motorized valve 65, so the operation of supplying the condensed water through the condensed water supply pipe 66 is temporarily suspended. In one state, the pump 55 circulates the condensed water through the condensed water circulation pipe 58 and recovers the condensed water through the condensed water recovery pipe 59 .

When the condensed water recovered by the continuous driving of the pump 55 is different to the motorized valve on sensor 70a located in the upper tank 50, the control unit 71 opens the motorized valve 65 again as described above. It is possible to supply condensed water to the boiler through the condensed water supply pipe 66 .

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those of ordinary skill in the art to which the present invention pertains will understand that the present invention may be implemented in other specific forms without changing the technical spirit or essential features. will be.

Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention described in the above detailed description is indicated by the following claims, meaning and All changes or modifications derived from the scope and its equivalents should be construed as being included in the scope of the present invention.

50: upper tank 51: lower tank
52: first connector 53: motor
54: condensate 55: pump
56: air bubble inflow prevention plate 57: first ejector
58: condensed water circulation pipe 59: condensed water recovery pipe
60: suction control valve 61: first check valve
62: filter 63: second check valve
64: second connection pipe 65: electric valve
66: condensed water supply pipe 67: second ejector
68: condensate discharge stop plate 70: water level sensor
71: control unit

Claims (3)

The upper and lower tanks 50 and 51 installed to pass through at least one or more first connection pipes 52, and the condensate water ( 54), a condensate circulation pipe (58) installed on the discharge side of the pump (55) and provided with a first ejector (57) and a discharge portion located inside the upper tank (50) And, a condensate recovery pipe 59 installed on one side of the first ejector 57 to recover the condensate 54, and a condensate recovery pipe 59 installed in the condensate recovery pipe 59 to prevent the reverse flow of the condensate 54 1 check valve 61, a second connection pipe 64 connected to the upper tank 50 and provided with a second check valve 63 to supply condensed water or steam to the boiler, and the condensed water circulation pipe 58 ) having one end fixed to pass through the lower end of the first ejector 57 and the other end connected to the second connecting pipe 64 to supply the condensed water 54 to the boiler side condensate water supply pipe 66, and A motorized valve 65 installed in the condensed water supply pipe 66 to open and close the flow path according to the amount of condensate 54 in the upper and lower tanks 50 and 51, the second connecting pipe 64 and the condensed water supply pipe 66 ) installed at the connection point of the second ejector 67 to drop the pressure of the condensed water as the condensed water 54 passes so that the condensed water or steam in the upper tank 50 is supplied to the boiler, and the upper and lower tanks ( A water level sensor 70 installed in 50 and 51 to detect the amount of condensed water 54, and a motor 53 or electric valve as the water level sensor 70 detects the amount of condensed water 54 (65) Condensate water supply device of the boiler, characterized in that consisting of a control unit (71) for controlling the drive. The method according to claim 1,
A condensate water supply device for a boiler, characterized in that the air bubble inflow prevention plate (56) formed with a plurality of through holes (56a) is further installed on the discharge side of the lower tank (51). The method according to claim 1,
A condensate water supply device for a boiler, characterized in that a filter (62) for filtering out foreign substances in the condensate (54) is further installed in the condensed water recovery pipe (59).

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