JP2017058033A - Flash steam recovery equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide flash steam recovery equipment capable of appropriately recovering flash steam without using power.SOLUTION: Flash steam recovery equipment 1 for recovering drain and flash steam generated from the drain is provided that comprises a feed water tank 10 for storing feed water; a drain recovery line L2 of which upstream side is connected to a drain generating source 120 and of which downstream side is connected to a liquid phase portion in the feed water tank 10; a circulation water line L3 of which upstream side is connected to an upper side than a connecting part with the drain recovery line L2 in the liquid phase portion of the feed water tank 10; and an ejector 30 arranged in the drain recovery line L2, connected to a downstream side of a circulation water line L3 and sucking feed water in the circulation water line L3 by drain and flash steam flowing in the drain recovery line L2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a flash vapor recovery apparatus.

Conventionally, in order to improve the utilization efficiency of heat in a steam generator such as a steam boiler, drain generated by condensing steam generated in the steam generator and used in load equipment and flash steam generated from the drain are used. A technique of collecting and reusing the water in a water supply tank that supplies water to the steam generator is used.
In addition, a flash steam recovery device that further improves the heat recovery efficiency by spraying and condensing the water stored in the water supply tank onto the flash steam recovered in the water supply tank has been proposed (for example, Patent Documents). 1).

JP 2009-150603 A

  However, in the flash steam recovery device that sprays and condenses the water stored in the water supply tank onto the flash steam, it is necessary to use power such as a pump to pump up the water stored in the water supply tank. Installation cost and running cost become high.

  Accordingly, an object of the present invention is to provide a flash steam recovery apparatus that can suitably recover flash steam without using power.

  The present invention relates to a drain and a flash steam recovery device that recovers flash steam generated from the drain, wherein a water supply tank that stores water supply, an upstream side is connected to a drain generation source, and a downstream side is a liquid phase portion of the water supply tank. A drain recovery line to be connected, a circulating water line whose upstream side is connected to the upper part of the drain recovery line in the liquid phase portion of the water supply tank, and the circulating water disposed in the drain recovery line and the circulating water The present invention relates to a flash steam recovery apparatus that is connected to the downstream side of the line and includes an drain that circulates through the drain recovery line and an ejector that sucks feed water inside the circulating water line by flash steam.

  Further, the flash steam recovery device includes a drain relief line connecting the upstream side of the ejector in the drain recovery line and a gas phase portion of the water supply tank, a drain relief valve disposed in the drain relief line, It is preferable to further include a control unit that controls opening and closing of the drain relief valve.

  The flash steam recovery device further includes a pressure detection unit that detects a pressure inside the drain recovery line, and the control unit detects the pressure when the pressure detected by the pressure detection unit exceeds a first pressure. It is preferable to open the drain relief valve.

  The flash steam recovery device further includes a water level detection unit that detects a water level of the water supply tank, and the control unit is a connection unit between the water supply tank and the circulating water line, the water level detected by the water level detection unit. It is preferable to open the drain relief valve when it falls below a first water level that is higher than the height of.

  According to the flash vapor recovery apparatus of the present invention, the flash vapor can be preferably recovered without using power.

It is a figure which shows the structure of a boiler system provided with the flash vapor recovery apparatus of this invention.

Hereinafter, a preferred embodiment of the flash vapor recovery apparatus of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a boiler system 100 including a flash steam recovery apparatus 1 according to the present embodiment.
The boiler system 100 of the present embodiment includes a boiler 110 as a steam generation device and a flash steam recovery device 1. In addition, the boiler system 100 connects these devices, and a steam supply line L1, a drain recovery line L2, a circulating water line L3, a drain relief line L4, and a makeup water line as lines through which steam or water flows. L5 and the water supply line L6 are provided.
Note that some of these lines also constitute part of the flash steam recovery apparatus 1 as will be described later.

The boiler 110 generates steam by heating the feed water supplied to the inside by the combustion gas. In the present embodiment, the boiler 110 is supplied with water (water supply) stored in a water supply tank 10 described later.
The steam supply line L1 supplies steam generated by the boiler 110 to the load device 120.
The load device 120 uses the steam generated in the boiler 110 as a heat source, and performs heat exchange with the object to be heated.

As shown in FIG. 1, the flash steam recovery apparatus 1 recovers the drain generated from the steam generated in the boiler 110 and used in the load device 120 and the steam generated from the drain (flash steam), and returns to the boiler 110 again. Supply.
The flash steam recovery device 1 includes a water supply tank 10, a drain recovery line L2, a circulating water line L3, an ejector 30, a drain escape line L4, a makeup water line L5, a water supply line L6, a control unit 50, Is provided.
The water supply tank 10 stores water (water supply) supplied to the boiler 110. An exhaust pipe 11 that communicates the inside and outside of the water supply tank 10 is provided above the water supply tank 10.
The exhaust pipe 11 is configured in such a shape that the base end side is connected to the upper surface of the water supply tank 10 and the distal end side opens downward or upward. In the present embodiment, the distal end side of the exhaust pipe 11 is configured in a curved shape so as to open downward.

  Further, the water supply tank 10 is provided with an electrode bar 13 as a water level detection unit that detects the water level of the water supply stored in the water supply tank 10. The electrode bar 13 is arranged to extend downward from the upper portion of the water supply tank 10 to a predetermined height so that the lower end portion is positioned at the first water level. The electrode rod 13 detects that the water level stored in the water supply tank 10 has fallen below the first water level. In the present embodiment, as the first water level, a water level that is higher than the height of a connection portion between a water supply tank 10 and a circulating water line L3, which will be described later, is set.

The drain recovery line L <b> 2 is connected to the load device 120 as a drain generation source on the upstream side, and connected to the liquid phase portion of the water supply tank 10 on the downstream side. The drain recovery line L2 recovers the drain generated by using the steam in the load device 120 and the flash steam generated from the drain in the flash steam recovery apparatus 1 (feed water tank 10).
In the present embodiment, the drain recovery line L2 includes a first drain recovery line L21 and a second drain recovery line L22.

The first drain recovery line L21 connects the load device 120 and an ejector 30 described later, and distributes the drain generated in the load device 120 to the ejector 30 side. A steam trap 91 and a pressure sensor 21 as a pressure detection unit are disposed in the first drain recovery line L21.
The steam trap 91 is disposed near the load device 120 in the first drain recovery line L21, and discharges the drain generated in the load device 120 and prevents the steam from being discharged downstream.
The pressure sensor 21 measures the pressure inside the first drain recovery line L21.
The second drain recovery line L22 connects the ejector 30 and the lower part of the water supply tank 10 which is a liquid phase part of the water supply tank 10.

  The upstream side of the circulating water line L <b> 3 is connected to the upper side of the connection portion between the second drain recovery line L <b> 22 and the water supply tank 10 in the liquid phase portion of the water supply tank 10. The downstream side of the circulating water line L3 is connected to the ejector 30. The circulating water line L3 supplies the water supply stored in the water supply tank 10 to the ejector 30.

The ejector 30 is disposed on the drain recovery line L2 and connected to the downstream side of the circulating water line L3. Then, the ejector 30 sucks the feed water inside the circulating water line L3 by the drain and the flush steam flowing through the drain recovery line L2.
In the present embodiment, the ejector 30 is disposed between the first drain recovery line L21 and the second drain recovery line L22, and the drain and flash steam flowing through the drain recovery line L2 are used as driving fluids for the circulating water line L3. The internal water supply is sucked, and the sucked water supply is sent to the second drain recovery line L22 side.

  The drain escape line L4 connects the upstream side of the ejector 30 in the drain recovery line L2 (that is, the first drain recovery line L21) and the gas phase portion of the water supply tank 10. A drain relief valve 41 is disposed in the drain relief line L4. The drain relief valve 41 is constituted by a motor valve or the like, and opens and closes the drain relief line L4.

The makeup water line L5 introduces water into the water supply tank 10. The front end portion of the makeup water line L5 is disposed in the liquid phase portion of the water supply tank 10.
The water supply line L6 connects the lower part of the water supply tank 10 and the boiler 110, and supplies the water supply stored in the water supply tank 10 to the boiler 110. A water supply pump 92 is disposed in the water supply line L6.

  According to the flash steam recovery apparatus 1 described above, in the state where the drain relief valve 41 is closed, the drain generated when the steam generated in the boiler 110 is used in the load device 120 is the first drain recovery line L21, the ejector 30. And it distribute | circulates through the 2nd drain collection line L22, and is supplied to the water supply tank 10. FIG.

  Here, most of the drain (for example, 90%) flowing through the first drain recovery line L21 is vaporized as the pressure decreases and flows in the state of flash steam. Then, in the ejector 30, the feed water inside the circulating water line L3 is sucked into the second drain recovery line L22 side using the drain and flash steam flowing through the drain recovery line L2 as the driving fluid. Then, the flash steam is condensed by the feed water sucked into the second drain recovery line L22 and supplied to the feed water tank 10 as condensed water. Thereby, the flash steam can be condensed and collected in the feed water tank 10 without using power.

  In addition, the water supply stored in the water supply tank 10 is circulated through the circulating water line L3 and the second drain recovery line L22 by causing the ejector 30 to suck the water supply in the circulating water line L3 toward the second drain recovery line L22. Be made. Therefore, since the water supply stored in the water supply tank 10 can be circulated without using power, the temperature of the water supply stored in the water supply tank 10 can be made uniform, and the heat utilization efficiency can be further improved.

  The control unit 50 controls the opening and closing of the drain relief valve 41. More specifically, the controller 50 opens the drain relief valve 41 when the pressure detected by the pressure sensor 21 exceeds a preset first pressure. As a result, when the pressure inside the first drain recovery line L21 rises and the differential pressure from the pressure on the load device 120 becomes small, the drain and flush steam can be released from the drain escape line L4 side. Therefore, for example, when a malfunction occurs in the steam trap 91 disposed on the load device 120 side and a large amount of flash steam is generated, the flash steam is discharged from the drain escape line L4 side to the outside through the gas phase part of the water supply tank 10. Let me escape. As a result, since the pressure inside the first drain recovery line L21 can be reduced, it is possible to prevent an excessive back pressure from being applied to the steam trap 91 and to prevent the drain from staying in the first drain recovery line L21. Can be recovered.

  Further, the control unit 50 opens the drain relief valve 41 when the water level detected by the electrode rod 13 is lower than the first water level. Here, in this embodiment, the water level higher than the height of the connection part of the water supply tank 10 and the circulating water line L3 is set as a 1st water level. Thereby, when the water level of the water supply tank 10 falls, the drain and the flush steam can be released to the drain escape line L4 before the water level falls below the connection portion between the water supply tank 10 and the circulating water line L3. Therefore, when the water level in the water supply tank 10 is lowered, air is sucked from the circulating water line L3 to the drain recovery line L2 side and supplied to the liquid phase portion of the water supply tank 10 without being condensed. Therefore, it is possible to prevent the occurrence of vibration due to the direct supply of flash steam to the water supply tank 10.

  According to the flash steam recovery apparatus 1 of the present embodiment described above, the following effects are obtained.

  (1) The flash steam recovery apparatus 1 is connected to the drain recovery line L2 whose downstream side is connected to the liquid phase portion of the water supply tank 10 and the upstream side is higher than the connection portion between the drain recovery line L2 in the liquid phase portion of the water supply tank 10. Is connected to the circulating water line L3 and the drain recovery line L2 and is connected to the downstream side of the circulating water line L3, and sucks the feed water inside the circulating water line L3 by flash steam flowing through the drain recovery line L2. And an ejector 30. Thereby, the water inside the circulating water line L3 can be sucked into the drain collecting line L2 side by sucking the water inside the circulating water line L3 using the flash steam flowing through the drain collecting line L2 as a driving fluid. Therefore, the flash steam can be condensed and supplied to the feed water tank 10 by the water supplied to the drain recovery line L2 side, so that the flash steam can be preferably recovered without using power. Moreover, since the feed water stored in the feed water tank 10 can be circulated without using power, the temperature of the feed water stored in the feed water tank 10 can be made uniform, and the heat utilization efficiency can be further improved.

  (2) The flash steam recovery device 1 includes a drain relief line L4, a drain relief valve 41 disposed in the drain relief line L4, and a control unit 50 that controls opening and closing of the drain relief valve 41. did. As a result, when it becomes a situation where drain and flash steam should not be supplied to the ejector 30 side, the drain relief valve 41 is opened to allow the drain and flash steam to escape to the outside through the gas phase portion of the water supply tank 10. The Therefore, the safety of the flash steam recovery apparatus 1 can be improved.

  (3) The controller 50 opens the drain relief valve 41 when the pressure inside the first drain recovery line L21 exceeds the first pressure. As a result, when the pressure inside the first drain recovery line L21 rises and the differential pressure from the pressure on the load device 120 becomes small, the drain and flush steam can be released from the drain escape line L4 side. Therefore, for example, when a malfunction occurs in the steam trap 91 disposed on the load device 120 side and a large amount of flash steam is generated, the flash steam is discharged from the drain escape line L4 side to the outside through the gas phase part of the water supply tank 10. Let me escape. As a result, it is possible to prevent an excessive back pressure from being applied to the steam trap 91, and thus it is possible to recover the drain while preventing the drain from staying in the first drain recovery line L21.

  (4) The drain relief valve 41 is opened when the water level of the water supply tank 10 falls below the first water level higher than the height of the connection part between the water supply tank 10 and the circulating water line L3. Thereby, when the water level of the water supply tank 10 falls, the drain and the flush steam can be released to the drain escape line L4 before the water level falls below the connection portion between the water supply tank 10 and the circulating water line L3. Therefore, when the water level in the water supply tank 10 is lowered, air is sucked from the circulating water line L3 to the drain recovery line L2 side and supplied to the liquid phase portion of the water supply tank 10 without being condensed. Therefore, it is possible to prevent the occurrence of vibration due to the direct supply of flash steam to the water supply tank 10.

The preferred embodiment of the flash vapor recovery apparatus 1 of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and can be modified as appropriate.
For example, in the present embodiment, the flash steam recovery apparatus 1 is applied to the boiler system 100 configured by one boiler 110, but is not limited thereto. In other words, the flash steam recovery device may be applied to a boiler system constituted by a plurality of boilers.
Moreover, in this embodiment, although the flash steam collection | recovery apparatus 1 was applied to the boiler system 100 comprised with the boiler 110, it does not restrict to this. That is, the flash steam recovery apparatus 1 may be applied to a system including another steam generation apparatus different from the boiler.
Moreover, in this embodiment, although the electrode rod 13 was used as a water level detection part, it is not restricted to this. That is, a water level sensor or the like may be used as the water level detection unit.

1 Flash Steam Recovery Device 10 Water Supply Tank 13 Electrode Bar (Water Level Detection Unit)
21 Pressure sensor (pressure detector)
30 Ejector 41 Drain relief valve 50 Control unit L2 Drain recovery line L3 Circulating water line L4 Drain relief line

Claims (4)

A flash steam recovery device for recovering drain and flash steam generated from the drain,
A water supply tank for storing water supply;
A drain recovery line in which an upstream side is connected to a drain generation source and a downstream side is connected to a liquid phase part of the water supply tank;
A circulating water line whose upstream side is connected to the upper part of the liquid phase part of the water supply tank and connected to the drain recovery line;
A flash steam recovery system comprising: an ejector disposed in the drain recovery line and connected to a downstream side of the circulating water line, and sucking water supplied in the circulating water line by drain and flash steam flowing through the drain recovery line. apparatus. A drain relief line connecting the upstream side of the ejector in the drain recovery line and the gas phase portion of the water supply tank;
A drain relief valve disposed in the drain relief line;
The flash steam recovery apparatus according to claim 1, further comprising a control unit that controls opening and closing of the drain relief valve. A pressure detector for detecting the pressure inside the drain recovery line;
The flash steam recovery apparatus according to claim 2, wherein the control unit opens the drain relief valve when the pressure detected by the pressure detection unit exceeds a first pressure. A water level detection unit for detecting the water level of the water supply tank;
The said control part opens the said drain relief valve, when the water level detected by the said water level detection part falls below the 1st water level higher than the height of the connection part of the said water supply tank and the said circulating water line. Or the flash steam recovery apparatus according to 3;

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