KR101141438B1 - Condensate Recovery and Automatic Water Supply System for a Closed Loop Circulating Steam Boiler - Google Patents

Abstract

PURPOSE: A device for collecting condensate water and automatically supplying water of a closed circuit circulation type steam boiler is provided to minimize an area due to a simple configuration and an installation in a limited space is possible. CONSTITUTION: A device for collecting condensate water and automatically supplying water of a closed circuit circulation type steam boiler comprises a condensate water tank(31), a pump cylinder(34), a suction valve(37), a pipe(42), a pump(43), a steam exhaust pipe(38), and a exhaust valve(40). The condensate water tank is installed in the end part of the condensate water pipe, thereby collecting condensate water(41). Steam of high temperature(32) which is latent heat collected to the condensate water tank flows into the pump cylinder through a steam suction pipe(33). The suction valve is installed on the suction pipe, thereby being opened only when inner pressure of the pump cylinder is decreased. The pipe is installed between the condensate water tank and pump cylinder so that the condensate water is transferred. The pump is installed on the pipe so that the condensate water is pumped to forward and reverse directions. The steam exhaust pipe is connected to the upper part of the pump cylinder, thereby exhausting the steam of high temperatures compressed by the pump cylinder.

Description

Condensate Recovery and Automatic Water Supply System for a Closed Loop Circulating Steam Boiler {omitted}

The present invention relates to a closed-loop circulating steam boiler that heats water and heats it, and more particularly, condensate generated by heat exchange in a heat exchanger by maintaining a pressure in a condensate tank lower than a pressure in a steam supply pipe. Condensate recovery and automatic water supply system of a closed-circuit type steam boiler that quickly recovers to the tank side and supplies high temperature steam, latent heat of condensate generated during condensate recovery, to the steam generator of the boiler to increase thermal efficiency. It is about.

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

1 is a longitudinal sectional view showing the main part of Patent No. 613397, which is a conventional apparatus, wherein a steam supply pipe 3 is installed on an upper portion of a boiler 1 and a heat exchanger 4 is connected to an end of the steam supply pipe 3. The other end of the heat exchanger is connected to a condensate pipe (5) for steam to heat exchange in the heat exchanger and recover the condensate generated in the south, at this time a steam trap (6) is installed on the condensate pipe .

The condensate return tank 8 is connected to a condensate return tank 8 having a float switch 7 at the end of the condensate line 5 and is connected to a conduit 9 connected to one side of the condensate return tank. As the float switch 7 detects that the water level is equal to or higher than the set water level, a condensate recovery pump 12 that operates by driving the motor 10 and pumps the condensate in the condensate recovery tank 8 to the water supply auxiliary tank 11 is installed. On the connecting pipe 9, a check valve 14 is installed to prevent the condensate 13 in the water supply auxiliary tank 11 from flowing back to the condensate recovery tank 8 side.

In addition, the water supply auxiliary tank 11 for supplying the condensed water 13 recovered through the connecting pipe 9 to the inside of the boiler 1 is provided at one side of the boiler 1 without water head difference on one side of the boiler 1. It is installed side by side and one side of the boiler 1 is provided with an automatic water level sensor 15 for detecting the water level of the condensate 13 located inside the boiler.

Compressed air supply pipe 16 is connected to the upper portion of the water supply auxiliary tank 11 installed on one side of the boiler 1 without water head difference with the boiler 1, and the other end of the compressed air supply pipe 11 to the water supply auxiliary tank 11 Compressor 19 for generating compressed air 18 by driving in accordance with the detection that the automatic pressure control switch 17 installed in the lower than the set pressure is installed.

Accordingly, the pressure of the steam does not act on the inside of the water supply auxiliary tank 11, as in the conventional steam boiler in which a pressure equalizing pipe is installed between the boiler 1 and the water supply auxiliary tank 11.

Further, the condensed water in the water supply auxiliary tank 11 is supplied to another boiler (not shown) on the condensed water supply pipe 20 that supplies the condensed water 13 in the water supply auxiliary tank 11 to the inside of the boiler 1. It is further provided with a preliminary valve 21 for branching.

Therefore, when steam (2) 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) for heating and some of the steam is a separate steam pipe Supplied through.

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

When the condensate 13 is filled in the condensate recovery tank 8 and detects that the float switch 7 is above the set level, power is automatically applied to the motor 10 so that the condensate recovery pump 12 is operated. The condensate 13 in the inside is recovered to the water supply auxiliary tank 11 through the connecting pipe 9.

In this way, after the condensate 13 is recovered to the water supply auxiliary tank 11, the high pressure compressed air (higher than the steam pressure in the boiler) generated by driving the compressor 19 is located in the upper portion of the water supply auxiliary tank 11. The pressure of the pressure in the water supply auxiliary tank 11 is detected by the automatic pressure control switch 17 installed at the upper part of the water supply auxiliary tank 11, and the compressor 19 is operated through the supply pipe 16. When higher than the steam pressure in the), the operation of the compressor 19 is temporarily stopped. When the pressure in the water supply auxiliary tank 11 becomes lower than the steam pressure in the boiler 1 by supplying condensed water, the automatic pressure control switch 17 supplies water. Since the compressor 19 is restarted until it detects that the pressure in the auxiliary tank 11 is higher than the steam pressure in the boiler 1, the pressure in the water supply auxiliary tank 11 is always higher than the steam pressure in the boiler 1. To maintain state do.

In this state, when the automatic water level sensor 15 detects that the water level of the condensate water 13 in the boiler is lower than the set water level due to the continuous operation of the boiler 1, the solenoid valve 23 installed on the condensate water supply pipe 20 is Since it is open, the condensed water in the water supply auxiliary tank 11 is filled into the inside of the boiler 1, at this time, even if the water level of the water supply auxiliary tank 11 is lower than the water level of the boiler 1 located on one side. Since the pressure of the compressed air higher than the steam pressure in the boiler 1 is applied to the upper portion of the auxiliary tank 11, the condensed water in the water supply auxiliary tank 11 is filled in the boiler 1 through the condensed water supply pipe 20.

However, such a conventional device has a number of problems as follows.

First, a condensate recovery tank 8 and a float switch 7 for recovering condensate are required, and a motor 10 and a pump 12 for pumping the condensate recovered to the condensate recovery tank to the water supply auxiliary tank 11. Since the structure of the lamp is necessary, the structure is complicated, and the production cost is increased, and it is a cause of frequent failures.

Second, in order to quickly supply the condensed water 13 to the boiler when the boiler 1 is temporarily stopped, the expensive compressor 19 and the compressed air supply pipe 20 are necessary. Of course, at one end of the water supply auxiliary tank 11, a connecting pipe 9 for recovering the condensed water 13, and at the other end, a condensed water supply pipe 20 for supplying the condensed water 13 to the boiler 1 separately. An operational problem has arisen that must be fixed by welding.

Third, since the configuration is complicated and the number of parts is large, it occupies a large area according to the installation of the device, and therefore, the installation of the device is restricted in a narrow place.

The present invention has been made in order to solve such a conventional problem, to improve the structure to maintain the pressure in the condensate tank below atmospheric pressure so that the high-temperature condensate after heat exchange can be quickly recovered to the condensate tank The high temperature steam contained in the high temperature condensate recovered by the condensate tank is supplied to the steam generating unit of the boiler to improve thermal efficiency and to significantly reduce the amount of fuel used.

According to an aspect of the present invention for achieving the above object, in the condensate recovery and water supply apparatus of the closed-circuit circulation steam boiler, the condensate tank is installed at the end of the condensate pipe and the condensate is recovered, the condensate recovered by the condensate tank A pump cylinder into which the latent heat of high temperature steam flows in through the steam suction pipe, a suction valve installed on the steam suction pipe to open only when the internal pressure of the pump cylinder drops, and the condensate is installed between the condensate tank and the pump cylinder. A pipe installed on the pipe, a pump installed on the pipe to pump the condensate in a forward and reverse direction, a steam discharge pipe connected to an upper portion of the pump cylinder to discharge hot steam compressed from the pump cylinder, and the steam Closed circuit circulating steam boiler, characterized in that the discharge valve installed on the discharge pipe The condensate return and the water supply device is provided.

The present invention has several advantages over the conventional apparatus as follows.

First, the condensate tank recovers condensate quickly by keeping the pressure in the condensate tank below the atmospheric pressure at all times lower than the steam supply pipe. Therefore, the condensate tank serves as a conventional water supply auxiliary tank, so that the float switch, water supply auxiliary tank, motor, pump, etc. The configuration can be omitted, and thus the structure can be greatly simplified to reduce production costs and to reduce failures.

Secondly, since the high temperature steam, which is latent heat generated by the recovery of condensate, is recovered and used as the steam generating unit of the boiler, the thermal efficiency is improved, thereby reducing the cost of steam production.

Third, since the configuration is simple, the number of parts is reduced, thereby minimizing the area according to the installation, and thus the device can be installed even in a narrow place.

1 is a longitudinal sectional view showing the main part of patent 613397, which is a conventional apparatus;
2 is a block diagram of a closed circuit circulating steam boiler to which the present invention is applied.
3A and 3B are longitudinal cross-sectional views showing a first embodiment of the present invention;
Figure 3a is a state in which hot steam is sucked into the pump cylinder
3b is a state in which condensed water is introduced into the pump cylinder to discharge hot steam
4A and 4B are longitudinal cross-sectional views showing a second embodiment of the present invention;
Figure 4a is a state in which hot steam is sucked into the pump cylinder
4b is a state in which condensed water is introduced into the pump cylinder to discharge hot steam
5 is a longitudinal sectional view showing a third embodiment of the present invention;
6A and 6B are longitudinal cross-sectional views showing a fourth embodiment of the present invention.
Figure 6a is a state in which hot steam is sucked into the pump cylinder
6b is a state in which condensed water is introduced into the pump cylinder to discharge hot steam
7A and 7B are enlarged views of FIG. 6A.
7A is a state diagram in which the flow path of the steam discharge pipe is opened
Figure 7b is a state in which the flow path of the steam discharge pipe is closed
FIG. 8 is a cross-sectional view taken along the line A-A of FIG. 7A

Hereinafter, with reference to Figures 2 and 3 showing the present invention as an embodiment in more detail as follows.

2 is a configuration diagram of a closed circuit circulating steam boiler to which the present invention is applied, and FIGS. 3A and 3B are longitudinal sectional views showing a first embodiment of the present invention, in which parts of the present invention have the same configuration as a conventional steam boiler. Are omitted and the same reference numerals will be given.

According to the present invention, a condensate tank 31 for recovering the condensate 13 is installed at the end of the condensate pipe 5, and the hot steam 32, which is a latent heat of the condensate recovered by the condensate tank, is installed inside the condensate tank 31. ) Is introduced through the steam intake pipe (33) is provided with a pump cylinder (34) for recovering it to the steam generating unit (not shown) of the boiler (1).

The steam suction pipe 33 is provided with a safety valve 35 and a pressure gauge 36 in sequence, and open at the end only when the internal pressure of the pump cylinder 34 drops, so that the hot steam 32 in the condensate tank 31 is discharged. A suction valve 37 is provided to flow into the pump cylinder 34 side, and a check valve 39 and a discharge valve 40 are provided on the steam discharge pipe 38 connected to the pump cylinder 34 and the boiler 1. It is installed.

The check valve 39 is a boiler (only hot steam 32 compressed through the discharge valve 40 when the condensed water 41 is introduced into the pump cylinder 34 to compress the hot steam 32). 1) is discharged to the side and when the condensate 41 reaches the check valve 39 to block the flow path of the steam discharge pipe 38 to block the phenomenon that the condensate 41 is moved to the steam generating side of the boiler (1) It will play a role.

In addition, a lower portion of the condensate tank 31 and a lower portion of the pump cylinder 34 are connected to each other via a pipe 42 through which the condensed water 41 is transferred, and the condensed water 41 is positively and reversely connected to the pipe 42. A pump 43 for pumping is installed, and forward and reverse driving of the pump 43 is controlled by the controller 52.

The water supply pipe 44 connected to the lower side of the condensate tank 31 is provided with a water supply pump 45 for supplying the condensate 41 to the boiler 1 side, and the water supply pipe 44 has a condensate tank 31. And a pressure equalizing pipe 46 are connected to each other, and the inside of the condensate tank 31 is atmospheric pressure in the process of supplying the condensate 41 in the condensate tank 31 to the boiler 1 by driving the water supply pump 45. This is to maintain the following and to prevent the phenomenon that vacuum is applied in advance.

4A and 4B are longitudinal cross-sectional views showing a second embodiment of the present invention, which differs from the first embodiment in that the steam intake pipe 33 and the intake valve 37 and the steam which are located above the pump cylinder 34 The discharge pipe 38, the discharge valve 40, and the check valve 39 are provided inside the condensate tank 31.

5A and 5B are longitudinal cross-sectional views showing a third embodiment of the present invention, which differs from the first embodiment in that the pump cylinder 34 compresses the hot steam 32 and forcibly feeds it to the boiler 1 side. Is installed outside the condensate tank 31.

6A and 6B are longitudinal cross-sectional views illustrating a fourth embodiment of the present invention, FIG. 7 is an enlarged view of FIG. 6A, and FIG. 8 is a cross-sectional view taken along line AA of FIG. 7, which is different from the first embodiment of the pump. A cup-type buoyancy valve 47 in which the outer circumferential surface 47a is cut is further installed inside the cylinder 34 so that the lowering is controlled by the stopper 48 and the steam discharge pipe 38 Discharge valve 40 installed on the) is composed of a valve disk 50 having a steam passage (50a) elastically installed in the coil spring (49).

At this time, a packing 51 for maintaining airtightness is fixed to the upper surface of the buoyancy valve 47.

In the fourth embodiment of the present invention, unlike the first, second, and third embodiments, the buoyancy valve 47 is connected to the check valve 39 without installing a separate check valve 39 on the steam discharge pipe 38. Since the condensate 41 in the pump cylinder 34 has a function to prevent movement to the steam generating unit of the boiler (1).

In the drawings, reference numeral 53 is a water gauge for visually identifying the condensate level in the condensate tank, 54 is a pressure switch for checking the pressure in the condensate tank, and 55 is a suction side installed at the bottom of the pump cylinder. Glass 56 is a discharge side glass installed at the upper portion of the pump cylinder, and 57 is a condensate return check valve provided at the condensate pipe.

Hereinafter, the operation of the present invention will be described.

First, when the steam 32 is generated by the operation of the boiler 1, the generated steam 32 is supplied to the heat exchanger 4 along the steam supply pipe 3 to perform heating and some of the steam It is fed through a steam pipe, the operation of which is the same as in a conventional closed circuit steam boiler.

When the condensate 41 is generated by heat exchange in the heat exchanger 4 as described above, the condensate tank 31 is recovered by the hot steam 32, which is latent heat of the condensate, because the condensate 41 is recovered through the condensate pipe 5. The pressure inside is increased.

Therefore, as shown in FIGS. 3A and 4A, the condensed water 41 in the pump cylinder 34 is sent to the condensed water tank 31 by the reverse driving of the pump 43, and when the condensed water 41 is not inside the pump cylinder 34, the pump cylinder Since the internal pressure of the 34 drops, the suction valve 37 provided on the steam suction pipe 33 is opened, so that the hot steam 32 in the condensate tank 31 is pumped through the steam suction pipe 33. It is introduced into the cylinder 34.

At this time, the discharge valve 40 provided on the vapor discharge pipe 38 is kept closed.

In this way, after the hot steam 32 in the condensate tank 31 is sucked into the pump cylinder 34, the pump 43 is driven in the forward direction under the control of the controller 52 to supply the condensate tank 31. Since the condensed water 41 is sucked into the pump cylinder 34 as shown in FIGS. 3B and 4B, the condensed water 41 is compressed by the condensed water 41 into which the hot steam 32 in the pump cylinder 34 flows. Is raised.

When the high temperature steam 32 pressure rises above the set value by the condensed water 41 rising into the pump cylinder 34 by the above operation, the discharge valve 40 installed in the steam discharge pipe 38 is opened, Accordingly, the high temperature steam 32 is sent to the steam generator of the boiler 1, reheated, and then sent to the heat exchanger 4, thereby reducing the amount of fuel used. In this case, the suction valve 37 is closed. Will be maintained.

As such, the check valve 39 is not loaded by the vapor that is the gas while the condensed water 41 is driven into the pump cylinder 34 to discharge the high temperature steam 32 by the driving of the pump 43. When the condensate 41 reaches the check valve 39 while maintaining the open state, the condensate 41 is closed by the resistance of the condensate 41 to close the flow path of the steam discharge pipe 38. The phenomenon which is sent to the steam generating part of (1) side is prevented.

On the other hand, in the case of Figure 6a shown in the fourth embodiment of the present invention there is no condensate 41 in the interior of the pump cylinder 34, the internal pressure is lowered, so the suction valve 37 provided on the steam intake pipe 33 is opened Thus, the high temperature steam 32 in the condensate tank 31 flows into the pump cylinder 34 through the steam suction pipe 33.

At this time, the valve disk 50, which is the discharge valve 40 provided in the steam discharge pipe 38, is lowered by the restoring force of the coil spring 49 as shown in Fig. 7A to close the vapor discharge pipe 38.

As described above, in the process of sucking the high temperature steam 32 into the pump cylinder 34, the cup-type buoyancy valve 47 is lowered due to its own weight and held in the stopper 48.

In this state, once the hot steam 32 is completely sucked into the pump cylinder 34, that is, after all of the condensed water 41 has escaped from the pump cylinder 34, the control of the large controller 52 is performed. The pump 43 is driven in the forward direction to suck the condensed water 41 in the condensate tank 31 into the pump cylinder 34 as shown in FIG. 6B, so that the hot steam 32 in the pump cylinder 34 The pressure is increased by being compressed by the condensed water 41 flowing in.

When the high temperature steam 32 pressure rises above the set value by the condensed water 41 rising into the inside of the pump cylinder 34 by the above operation, the valve disc 50 installed in the steam discharge pipe 38 is shown in FIG. As it rises while compressing the coil spring 49 to open the flow path of the steam discharge pipe 38, the compressed high temperature steam 32 is reheated in the steam generator of the boiler 1 to the heat exchanger 4. Can be sent to reduce the amount of fuel used.

At this time, the high-temperature steam 32 compressed by the condensate 41 has a buoyancy valve 47 having an outer circumferential surface 47a formed therebetween, and through a gap in the outer circumferential surface 47a and the pump cylinder 34 as shown in FIG. 8. It is discharged to the vapor discharge pipe 38 along the arrow direction of FIG. 7A.

In this way, the condensate 41 is driven into the pump cylinder 34 by the driving of the pump 43 to discharge the high temperature steam 32. If the difference between the buoyancy valve 47 by the rising pressure of the condensate 41, the packing 51 fixed to the upper surface closes the inlet of the steam discharge pipe 38, so as to the valve disk 50 as described above Is lowered by the restoring force of the coil spring 49 to close the steam discharge pipe 38, thereby preventing the condensate 41 from being sent to the steam generating unit on the boiler 1 side.

The reason why the metal buoyancy valve 47 rises due to the inflow of the condensate 41 is that the condensate 41 is introduced into the pump cylinder 34 by the driving of the pump 43. This is possible because the buoyancy is generated by the steam 32 filled in the valve 47.

As described above, as the pump 43 repeatedly drives forward and backward under the control of the controller 52, the condensate tank 31 reciprocates toward the pump cylinder 34 while the condensate 41 is reciprocated to the pump cylinder 34. Since the high-temperature steam 32 in the air is compressed and supplied to the steam generator of the boiler 1, the pressure in the condensate tank 31 can be kept below atmospheric pressure, and thus the high-temperature steam heat exchanged by the heat exchanger 4 32 can be recovered to the condensate tank 31 more quickly.

As described above, the operation of forcibly transporting the high temperature steam 32 in the condensate tank 31 to the steam generator of the boiler 1 to increase the thermal efficiency is performed by the pressure switch 54 to set the pressure in the condensate tank 31. Continued until the detection below, the pressure switch 54 temporarily stops the driving of the pump 43 when the pressure in the condensate tank 31 is below the set value.

On the other hand, when the pump 43 is driven to supply the steam 32 in the condensate tank 31 to the steam generator on the boiler 1 side, when the water level of the boiler 1 is detected by the controller 52 is low. The water supply pump 45 is driven to supply the condensed water 41 in the condensed water tank 31 to the boiler 1 side.

Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiments are for the purpose of description and not of limitation.

In addition, it will be understood by those skilled in the art that various changes can be made within the scope of the technical idea of the present invention.

1: boiler 4: heat exchanger
31 condensate tank 33 steam intake pipe
34: pump cylinder 37: suction valve
38: steam discharge pipe 39: check valve
40: discharge valve 43: pump
45: water supply pump 46: pressure equalizing pipe
47: buoyancy valve 49: coil spring
50: valve disc 52: controller

Claims (6)

In the condensate recovery and water supply device of a closed-circuit circulation steam boiler, a high temperature which is installed at the end of the condensate pipe (5), the condensate tank 31 to recover the condensate 41 and the latent heat of the condensate recovered by the condensate tank The pump 32 of the steam 32 is introduced through the steam suction pipe 33, the suction valve 37 is installed on the steam suction pipe is opened only when the internal pressure of the pump cylinder drops, and the condensate tank ( 31 between the pump cylinder 34 and the pump cylinder 34 to convey the condensate 41, a pump 43 installed on the pipe to pump the condensate in the forward and reverse directions, and the pump cylinder Condensed water in a closed circuit circulating steam boiler comprising a steam discharge pipe 38 connected to an upper portion of the steam discharge pipe 38 to discharge hot steam compressed from a pump cylinder, and a discharge valve 40 installed on the steam discharge pipe. time And the water supply device. The method according to claim 1,
The pump cylinder 34 is installed in the condensate tank 31, characterized in that the condensate recovery and water supply of the closed-circuit circulation steam boiler. The method according to claim 1,
Condensate recovery and water supply device of the closed-circuit circulation steam boiler, characterized in that the pump cylinder (34) is installed outside the condensate tank (31). The method according to claim 2,
Condensate recovery and water supply device of the closed loop circulation steam boiler, characterized in that the steam suction pipe 33 is located inside or outside the condensate tank (31). The method according to claim 2,
Condensate recovery and water supply device of the closed circuit circulation steam boiler characterized in that the check valve 39 is further provided directly below the discharge valve 40 installed in the steam discharge pipe (38). The method according to claim 2,
An outer circumferential surface 47a is cut to allow steam to pass through the pump cylinder 34, and a cup-type buoyancy valve 47 having a through hole 47b is installed to control the lowering of the pump cylinder 34 to control the lowering of the pump cylinder 34. The discharge valve 40 installed on the discharge pipe 38 is a valve disk 50 having a steam passage 50a elastically installed by the coil spring 49, and condensed water recovery of the closed circuit circulating steam boiler. And water supply.

Images