JP6209941B2 - Boiler system - Google Patents

Description

  The present invention relates to a boiler system. More specifically, the present invention relates to a closed type boiler system that collects drain discharged from a load device without supplying it to the atmosphere and supplies water to the boiler.

  Conventionally, steam generated by a boiler is supplied to the load equipment, and the drain generated by condensation of the steam used as a heat source in the load equipment is collected in a sealed drain tank with pressure resistance at high temperature and pressure. And the closed type boiler system which supplies water to a boiler again is proposed (for example, refer patent document 1).

JP 2006-105442 A

  Incidentally, flash steam is generated inside the drain tank due to a decrease in the pressure of the drain. The flash vapor generated inside the drain tank is discharged to the outside. Here, the flash steam is introduced into an open tank opened to the atmosphere for storing makeup water to be supplied to the boiler, and heat stored in the flash steam is recovered. However, when the flash steam generated in the drain tank is introduced into the open tank, the temperature of the makeup water stored in the open tank exceeds 100 ° C, and the heat held by the flash steam may not be sufficiently recovered. .

  Therefore, an object of this invention is to provide the boiler system which can improve the utilization efficiency of a heat | fever more.

  The present invention includes a boiler that generates steam, and supplies a boiler that supplies the generated steam to a first load device, and a drain that is generated when the first load device condenses by using the steam. A drain tank that is collected without being released to the atmosphere, a first drain collection line that connects the first load device and the drain tank, and the drain tank and the boiler that are connected to each other and stored in the drain tank. A first drain supply line for supplying drain to the boiler, and an air / water separator provided in the first drain recovery line for separating the drain flowing through the first drain recovery line and the flash steam generated from the drain And a first flash steam line having one end connected to the steam separator and supplying flash steam separated by the steam separator to a second load device. Type of boiler system.

  The boiler system includes an open tank that is open to the atmosphere and stores makeup water to be supplied to the boiler, and a second drain recovery line that has one end connected to the second load device and the other end connected to the open tank. It is preferable to further comprise.

  In addition, the boiler system has a second flash steam line, one end of which is connected to the drain tank and supplies flash steam generated in the drain tank to a third load device, and one end connected to the third load device. It is preferable to further include a third drain recovery line whose end side is connected to the open tank.

  According to the boiler system of the present invention, the utilization efficiency of heat can be further improved.

It is a figure showing the composition of the boiler system concerning one embodiment of the present invention.

Hereinafter, preferred embodiments of the boiler system of the present invention will be described with reference to the drawings. As shown in FIG. 1, the boiler system of the present invention collects the drain generated in the first load device 20 in a sealed tank having pressure resistance in a high temperature and high pressure state, and supplies the drain to the boiler. It is a closed type boiler system.
Moreover, the boiler system 1 of this embodiment is a boiler system that further improves the heat utilization efficiency by supplying the flash steam generated from the drain to the second load device 50 and the third load device 60. is there.

  The boiler system 1 of this embodiment is provided with the boiler 10, the drain tank 30, the open tank 40, and the steam-water separator 70, as shown in FIG.

  In addition, the boiler system 1 connects these devices, a plurality of lines through which steam or water flows, a plurality of valves that open and close the plurality of lines, a plurality of pumps arranged in a predetermined line, and a plurality of these A control device (not shown) for controlling operations of a valve, a plurality of pumps and the like is provided. Specifically, the boiler system 1 includes, as lines, a first steam supply line L1, a first drain recovery line L2, a first drain supply line L3, a second steam supply line L4, and a first flash steam line. L51, a second drain recovery line L52, a second flash steam line L61, a third drain recovery line L62, a makeup water line L7, and a first drain circulation line L8.

  The boiler 10 includes a can body 11 that generates steam, a steam header 12 that collects steam generated by the can body 11, a connecting pipe 13 that connects the can body 11 and the steam header 12, and a connecting pipe 13. And a gas-liquid separator 14 that separates moisture contained in the steam generated by the can 11.

According to the boiler 10 described above, the drain supplied to the can 11 is heated by the combustion of fuel, and steam is generated from the drain. The moisture contained in the steam generated in the can 11 is removed by the gas-liquid separator 14, and the steam from which the moisture has been removed is collected in the steam header 12 via the connecting pipe 13.
The steam collected in the steam header 12 is supplied to the first load device 20 which is a steam using facility.

The first load device 20 uses the steam generated in the boiler 10 as a heat source, and performs heat exchange with the object to be heated.
The drain tank 30 collects and stores the drain generated by agglomeration of a part of the steam used for heat exchange in the first load device 20. The drain tank 30 is constituted by a pressure vessel that has pressure resistance and can be sealed.

  The open tank 40 is open to the atmosphere. The open tank 40 stores makeup water supplied to the boiler 10.

  The steam separator 70 is disposed in a first drain recovery line L2 described later. The steam separator 70 separates the drain that flows through the first drain recovery line L2 and the flash vapor generated from the drain.

  The first steam supply line L <b> 1 connects the steam header 12 and the first load device 20, and supplies the steam generated by the boiler 10 to the first load device 20.

The first drain recovery line L <b> 2 connects the first load device 20 and the drain tank 30, and supplies the drain generated in the first load device 20 to the drain tank 30. The first drain recovery line L2 includes an upstream recovery line L21 that connects the first load device 20 and the steam separator 70, and a downstream recovery line L22 that connects the steam separator 70 and the drain tank 30. And comprising.
In the upstream recovery line L21, a steam trap 21 and a check valve 22 that discharge drain generated in the first load device 20 and prevent discharge of steam are disposed.
In the downstream collection line L22, a steam trap 23 that discharges the drain separated in the steam separator 70 and prevents discharge of flash vapor is disposed.

  The first drain supply line L3 connects the drain tank 30 and the boiler 10, and supplies the drain accommodated in the drain tank 30 to the boiler 10. In the first embodiment, the upstream end of the first drain supply line L <b> 3 is connected to the lower portion of the drain tank 30. Further, the downstream side of the first drain supply line L <b> 3 is connected to the lower portion of the can 11.

A drain pump 31 and a drain supply valve 32 are arranged in the first drain supply line L3.
The drain pump 31 boosts the drain supplied from the drain tank 30 and supplies it to the boiler 10. The drain supply valve 32 is configured by a motor valve.

  The second steam supply line L4 connects the steam header 16 and the drain tank 30. The second steam supply line L4 supplies steam generated in the boiler 10 to the drain tank 30 and adjusts the pressure inside the drain tank 30. A pressure regulating valve 41 and a motor valve 42 are disposed in the second steam supply line L4.

The first flash steam line L51 has one end connected to the steam separator 70 and the other end connected to the second load device 50. The first flash steam line L51 supplies the flash steam separated by the steam separator 70 to the second load device 50.
The second drain recovery line L52 has one end connected to the second load device 50 and the other end connected to the open tank 40. The second drain recovery line L52 recovers the drain generated from the flash steam heat-exchanged by the second load device 50 in the open tank 40. A steam trap 51 that discharges the drain generated in the second load device 50 and prevents the discharge of the flash vapor is disposed in the second drain recovery line L52.

  The second flash steam line L61 has one end connected to the upper part of the drain tank 30 and the other end connected to the third load device 60. The second flash steam line L61 supplies the flash steam generated in the drain tank 30 to the third load device 60. A pressure regulating valve 61 is disposed in the second flash steam line L61. When the pressure inside the drain tank 30 exceeds a predetermined pressure, the pressure regulating valve 61 releases the flash steam to the third load device 60 side, and reduces the pressure inside the drain tank 30.

  The third drain recovery line L62 has one end connected to the third load device 60 and the other end connected to the open tank 40. The third drain recovery line L62 recovers the drain generated from the flash steam heat-exchanged by the third load device 60 in the open tank 40. A steam trap 62 that discharges drain generated in the third load device 60 and prevents discharge of flash vapor is disposed in the third drain recovery line L62.

  The makeup water line L7 connects the open tank 40 and the drain tank 30 and supplies water stored in the open tank 40 to the drain tank 30. A pump 71 is disposed in the makeup water line L7.

  The first drain circulation line L8 connects the first drain supply line L3 and the drain tank 30. More specifically, the upstream (base end) end of the first drain circulation line L8 is connected between the drain pump 31 and the drain supply valve 32 in the first drain supply line L3. The downstream end of the first drain circulation line L <b> 8 branches into a line connected to the upper part of the drain tank 30 and a line connected to the lower part of the drain tank 30. A motor valve 81 is disposed on the line connected to the upper portion of the drain tank 30, and an orifice 82 is disposed on the line connected to the lower portion of the drain tank 30.

  The first drain circulation line L8 returns a part or all of the drain flowing through the first drain supply line L3 to the drain tank 30. More specifically, from the line connected to the lower part of the drain tank 30, the drain is circulated to the liquid phase part of the drain tank 30, and from the line connected to the upper part of the drain tank 30, the gas phase of the drain tank 30 is Drain is circulated in the part. In the first drain circulation line L8, the flow rate of the drain circulated to the liquid phase part is adjusted by the orifice 82 to make the temperature of the drain stored in the drain tank 30 uniform, and the drain circulated to the gas phase part. Thus, the flash vapor generated in the drain tank 30 is recovered.

Next, operation | movement of the boiler system 1 of this embodiment is demonstrated.
In the first embodiment, first, steam is generated in the boiler 10 (can 11). The steam generated in the can 11 is supplied to the steam header 12 through the connecting pipe 13 after moisture is separated in the gas-liquid separator 14.

The steam supplied to the steam header 12 becomes drain after being used in the first load device 20, and flows through the first drain recovery line L2. More specifically, the drain discharged from the first load device 20 is introduced into the steam separator 70 through the upstream recovery line L21. Then, the steam vapor generated from the drain is separated in the steam separator 70, and the separated flash steam is supplied to the second load device 50 through the first flash steam line L51.
The flash steam supplied to the second load device 50 is heat-exchanged in the second load device 50 and then recovered to the open tank 40 through the second drain recovery line L52.

The drain from which the flash steam has been separated in the steam separator 70 is collected in the drain tank 30 in a high-temperature and high-pressure state through the downstream collection line L22. And the drain stored by the drain tank 30 is supplied to the boiler 10 as feed water through the 1st drain supply line L3.
In addition, a part of the drain flowing through the first drain supply line L3 is returned to the drain tank 30 through the first drain circulation line L6.

On the other hand, the flash steam generated in the drain tank 30 is supplied to the third load device 60 through the second flash steam line L61.
The flash steam supplied to the third load device 60 is subjected to heat exchange in the third load device 60 and then recovered to the open tank 40 through the third drain recovery line L62.

  According to the boiler system 1 of this embodiment demonstrated above, there exist the following effects.

  (1) In the closed type boiler system 1, the drain generated by using steam in the first load device 20 is collected in the drain tank 30 and then supplied to the boiler 10 again. Moreover, in the boiler system 1, it is calculated | required to utilize more effectively the heat | fever which a drain and the flash vapor | steam generate | occur | produces from this drain hold. Here, in particular, in the case where heat exchange is performed using flash steam in the second load device 50, the second load device 50 (flash) depends on the installation status of the boiler system 1 (drain tank 30). The distance between the steam-using device) and the drain tank 30 where the flash steam is generated may increase. Therefore, the boiler system 1 includes the steam / water separator 70 provided in the first drain recovery line L2. Thereby, the distance from the flash steam collection position to the second load device 50 can be shortened by disposing the steam / water separator 70 at a position close to the second load device 50. Therefore, even when the installation location of the drain tank 30 is restricted, the heat utilization efficiency can be further improved by arranging the steam separator 70 appropriately according to the position of the second load device 50. It is done.

  (2) The boiler system 1 includes an open tank 40 that stores makeup water to be supplied to the boiler 10 and a second drain recovery line L52 that connects the second load device 50 and the open tank 40. . As a result, the flash steam that has undergone heat exchange in the second load device 50 or the drain generated from the flash steam can be collected in the open tank 40. Therefore, since the heat | fever which the flash vapor | steam after performing heat exchange with the 2nd load apparatus 50 or a drain can be collect | recovered with the open tank 40, the utilization efficiency of the heat | fever of the boiler system 1 can be improved more.

  (3) The boiler system 1 connects the second flash steam line L61 for supplying the flash steam generated in the drain tank 30 to the third load device 60, and the third load device 60 and the open tank 40. And a drain recovery line L62. As a result, the flash steam generated in the drain tank 30 can also be used in the third load device 60, and the flash steam subjected to heat exchange in the third load device 60 or the drain generated from this flash steam is used as the open tank 40. Can be recovered. Therefore, the heat utilization efficiency of the boiler system 1 can be further improved.

As mentioned above, although each preferred embodiment of the boiler system of the present invention was described, the present invention is not limited to the embodiment mentioned above, and can be changed suitably.
For example, in this embodiment, although the boiler system 1 was comprised with the one boiler 10, it is not restricted to this. That is, the boiler system may be configured to include a plurality of boilers.

  In the present embodiment, the makeup water line L7 is configured by connecting the open tank 40 and the drain tank 30, but the present invention is not limited to this. That is, the makeup water line includes a first makeup water line that connects the open tank and the drain tank, and a second makeup water line that connects the open tank and the first drain supply line. Also good.

  In the present embodiment, the steam traps 51 and 62 are disposed in the second drain recovery line L52 and the third drain recovery line L62, respectively, but the present invention is not limited thereto. That is, when the drain after performing heat exchange in the second load device 50 and the third load device 60 is less than 100 ° C., the boiler system may be configured without arranging the steam trap. .

DESCRIPTION OF SYMBOLS 1 Boiler system 10 Boiler 11 Can body 20 1st load apparatus 30 Drain tank 40 Open tank 50 2nd load apparatus 60 3rd load apparatus 70 Air-water separator L2 1st drain collection line L3 1st drain supply line L51 1st flash steam line L52 2nd drain recovery line L61 2nd flash steam line L62 3rd drain recovery line

Claims (3)

A boiler that has a can that generates steam and supplies the generated steam to the first load device;
A drain tank that collects the drain generated by the condensation of the first load device by using steam in a high-temperature and high-pressure state without opening it to the atmosphere;
A first drain recovery line connecting the first load device and the drain tank;
A first drain supply line for connecting the drain tank and the boiler and supplying the boiler with the drain stored in the drain tank;
A steam separator provided in the first drain recovery line, for separating the drain flowing through the first drain recovery line and the flash vapor generated from the drain;
A closed-type boiler system comprising: a first flash steam line having one end connected to the steam separator and supplying the second steam to the second load equipment without compressing the flash steam separated by the steam separator. An open tank that is open to the atmosphere and stores makeup water to be supplied to the boiler;
The boiler system according to claim 1, further comprising: a second drain recovery line having one end connected to the second load device and the other end connected to the open tank. A second flash steam line having one end connected to the drain tank and supplying flash steam generated in the drain tank to a third load device;
The boiler system according to claim 2, further comprising: a third drain collection line having one end connected to the third load device and the other end connected to the open tank.

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