JP6488937B2 - Flash steam recovery device for deaerated water - Google Patents

Description

  The present invention relates to a flash steam recovery apparatus for deaerated water.

Conventionally, in a steam generator that generates steam by heating feed water, in order to suppress corrosion due to oxidation inside the can body constituting the steam generator, a deaeration process that removes dissolved oxygen contained in the feed water May be performed. In such a steam generator, the degassed water supply (degassed water) is stored in a water supply tank, and water is supplied from the water supply tank to the can body.
In addition, in order to improve the heat utilization efficiency of the steam generator, the drain generated from the steam generated by the steam generator and used in the load equipment and the steam generated from this drain (flash steam) are stored in the water supply tank. A technique has also been proposed in which the degassed water is condensed and collected in a water supply tank and reused (see, for example, Patent Document 1).

  Here, in the steam generator using degassed water as feed water, when air is mixed into the feed water tank when the flash steam is condensed, the amount of dissolved oxygen in the deaerated water increases. Therefore, in the technique proposed in Patent Document 1, the vapor phase portion of the water supply tank is filled with steam, and the air in the gas phase portion is purged with steam, thereby condensing the flash vapor into the water supply tank. Air intake is reduced.

JP 2009-150603 A

  However, in the technique proposed in Patent Document 1, when the temperature of the deaerated water stored in the water supply tank is lowered, the flash vapor is rapidly condensed by the low-temperature deaerated water. In some cases, air is sucked into the gas phase portion of the water supply tank, and the amount of dissolved oxygen in the deaerated water increases.

  Therefore, an object of the present invention is to provide a flash steam recovery apparatus for deaerated water that can further reduce the dissolution of oxygen into the deaerated water.

  The present invention includes a tank body that stores deaerated water, a drain introduction pipe having a distal end portion disposed in a liquid phase portion inside the tank body and a proximal end portion disposed outside the tank body, and the drain introduction. A flash steam recovery part disposed so as to surround the drain introduction pipe on the proximal end side of the pipe, and a drain for supplying drain and flash steam to the flash steam recovery part with a distal end part disposed inside the flash steam recovery part A recovery line, a flash steam relief line whose proximal end is connected to the flash steam recovery section and whose distal end is opened to the outside, and a flash steam relief valve disposed in the flash steam escape line and opening and closing the flash steam escape line; And connecting the tank body and the flash steam recovery section to remove the deaerated water stored in the tank body. Measured by a circulating water line to be circulated to the steam recovery unit, a circulating water pump disposed in the circulating water line, a temperature measuring unit for measuring the temperature of the deaerated water stored in the tank body, and the temperature measuring unit And a controller for controlling the flash steam relief valve and the circulating water pump based on the temperature of the deaerated water.

  Further, the control unit stops the circulating water pump and opens the flash steam relief valve when the temperature of the deaerated water measured by the temperature measurement unit is equal to or higher than a first temperature, and the temperature measurement When the temperature of the deaerated water measured by the unit is lower than the first temperature, it is preferable to drive the circulating water pump and close the flash steam relief valve.

  Moreover, it is preferable that the flush steam recovery apparatus for deaerated water further includes a pressure equalization line that communicates the drain recovery line with the inside of the flash steam recovery unit.

  According to the flash steam recovery apparatus for deaerated water of the present invention, the dissolution of oxygen into the deaerated water can be further reduced.

It is a figure which shows the structure of a boiler system provided with the flash vapor recovery apparatus for deaerated water of this invention. It is a partial expanded sectional view of FIG. FIG. 2 is a partially enlarged cross-sectional perspective view of FIG. 1.

Hereinafter, a preferred embodiment of a flash steam recovery apparatus for degassed water according to 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 the deaerated water flash steam recovery apparatus 1 according to the present embodiment.
The boiler system 100 according to the present embodiment includes a boiler 110 as a steam generator and a degassed water flash steam recovery apparatus 1. Further, the boiler system 100 includes a steam supply line L1, a drain recovery line L2, a water supply line L3, and a pressure equalization line L4 as lines through which these devices are connected and through which steam or water flows.

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 deaerated water stored in a tank body 10 described later as feed water.
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 deaerated water 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). The boiler 110 is supplied again. Details of the flash steam recovery device 1 for deaerated water will be described later.

The steam supply line L1 connects the boiler 110 and the load device 120, and supplies the steam generated by the boiler 110 to the load device 120.
The drain recovery line L <b> 2 connects the load device 120 and the deaerated water flash steam recovery device 1, and recovers the drain generated by using the steam in the load device 120 to the deaeration water flash steam recovery device 1. A steam trap 91 is disposed in the drain recovery line L2.

The water supply line L <b> 3 connects the deaerated water flash steam recovery apparatus 1 and the boiler 110, and supplies the deaerated water stored in the deaerated water flash steam recovery apparatus 1 to the boiler 110. A water supply pump 92 is disposed in the water supply line L3.
The pressure equalization line L4 constitutes a part of the flash steam recovery apparatus 1 for deaerated water. The pressure equalization line L4 will be described later.

  The deaerated water flash steam recovery apparatus 1 includes a tank body 10, a deaerated water introduction line L5, a drain introduction pipe 20, a flash steam recovery unit 30, a drain recovery line L2, a flash steam escape line 40, A circulating water line 50, a pressure equalizing line L4, and a control unit 60 are provided.

The tank body 10 stores deaerated water. An exhaust pipe 11 that communicates the inside and the outside of the tank body 10 and an inspection opening 12 are provided on the upper portion of the tank body 10.
The exhaust pipe 11 is configured in a curved shape such that the proximal end side is connected to the upper surface of the tank body 10 and the distal end side opens downward.

The inspection opening 12 is disposed on the upper surface of the tank body 10. The inspection opening 12 includes an inspection opening and a lid member that is detachably attached to the inspection opening.
The tank body 10 is provided with a temperature sensor 13 as a temperature measuring unit that measures the temperature of the deaerated water stored in the tank body 10. The temperature sensor 13 is disposed in the lower part of the tank body 10.

  The base end side of the water supply line L3 is connected to the lower part of the above tank main body 10, and deaerated water is supplied to the boiler 110 through this water supply line L3. In addition, a plurality of beads 14 are accommodated in the tank body 10. When the deaerated water is stored inside the tank body 10, the plurality of beads 14 float on the water surface and cover the water surface, and the air (gas phase) and the deaerated water (liquid phase) inside the tank body 10 Prevent contact.

  The deaerated water introduction line L5 introduces deaerated water into the tank body 10. The tip of the degassed water introduction line L5 is disposed in the liquid phase part of the tank body 10. Thereby, when deaerated water is introduced into the tank body 10, it is possible to prevent the air (oxygen) from being dissolved in the deaerated water due to contact between the deaerated water and the air inside the tank body 10.

The drain introduction pipe 20 is disposed so as to penetrate the upper surface of the tank body 10 and extends in the vertical direction. The drain introduction pipe 20 has a distal end portion (lower end portion) disposed at a liquid phase portion inside the tank body 10 and a proximal end portion (upper end portion) disposed outside the tank body 10.
In the present embodiment, the lower end portion of the drain introduction tube 20 is opened downward, and the upper end portion of the drain introduction tube 20 is closed. A drain introduction opening 21 is formed on the peripheral surface near the upper end of the drain introduction pipe 20.

The flash steam recovery unit 30 is configured in a cylindrical shape extending in the vertical direction, and is disposed so as to surround the outside of a portion disposed outside the tank body 10 that is the base end side of the drain introduction pipe 20. More specifically, as shown in FIGS. 2 and 3, the upper end portion of the drain introduction pipe 20 penetrates the lower end surface of the flash steam recovery portion 30. The lower end portion of the flash steam recovery unit 30 substantially coincides with the lower end portion of the drain introduction opening 21 of the drain introduction pipe 20.
A punching plate 31 serving as a plate member in which a plurality of through holes 311 are formed is disposed at the longitudinal center of the flash vapor recovery unit 30. The punching plate 31 divides the inside of the flash steam recovery unit 30 vertically in a state in which fluid can flow.

  As described above, the drain recovery line L2 recovers the drain generated by using the steam in the load device 120 to the deaerated water flash steam recovery apparatus 1. In the present embodiment, the distal end portion of the drain recovery line L <b> 2 is disposed below the punching plate 31 inside the flash steam recovery portion 30. The front end portion of the drain recovery line L2 is opened downward, so that the drain that has flowed through the drain recovery line L2 and the flash vapor generated from the drain flow downward in the flash steam recovery unit 30. Derived (spouted) towards.

  The flash steam escape line 40 has a proximal end side connected to the upper part of the flash steam recovery unit 30 and a distal end side opened to the outside. A flash steam relief valve 41 is disposed in the flash steam relief line 40. The flash steam relief valve 41 is configured by an electromagnetic valve or the like, and opens and closes the flash steam relief line 40.

The circulating water line 50 connects the lower part of the tank body 10 and the upper part of the flash steam recovery unit 30. The circulating water line 50 circulates the deaerated water stored in the tank body 10 to the flash steam recovery unit 30. A circulating water pump 51 and a spray device 52 are disposed in the circulating water line 50.
The circulating water pump 51 pressurizes deaerated water stored in the tank body 10 and sends it to the flash steam recovery unit 30 side.
The spray device 52 is disposed above the punching plate 31 inside the flash steam recovery unit 30 and is connected to the tip of the circulating water line 50. The spray device 52 sprays deaerated water flowing through the circulating water line 50 into the flash steam recovery unit 30.

  The pressure equalization line L4 communicates the drain recovery line L2 and the inside of the flash steam recovery unit 30. In the present embodiment, the pressure equalization line L4 connects the drain recovery line L2 and the upstream side of the flush steam relief valve 41 in the drain relief line 40.

The control unit 60 controls the operation of the deaerated water flash steam recovery apparatus 1. The controller 60 controls the operations of the flash steam relief valve 41 and the circulating water pump 51 based on the temperature of the deaerated water measured by the temperature sensor 13.
In the present embodiment, the control unit 60 stops the circulating water pump 51 when the temperature of the deaerated water measured by the temperature sensor 13 is equal to or higher than a preset first temperature (for example, 90 degrees). The flash steam relief valve 41 is opened.
Further, when the temperature of the deaerated water measured by the temperature sensor 13 is lower than the first temperature, the control unit 60 drives the circulating water pump 51 to close the flash steam relief valve 41.

  According to the above-described flash steam recovery apparatus 1 for deaerated water, the drain generated by using the steam generated in the boiler 110 in the load device 120 flows through the drain recovery line L2 and is introduced into the flash steam recovery unit 30. Is done. Here, most of the drain (for example, 90%) flowing through the drain recovery line L2 is vaporized as the pressure decreases and is introduced into the flash steam recovery unit 30 in the state of flash steam.

  Here, when the temperature of the deaerated water stored in the tank main body 10 is lower than the first temperature, the flash steam recovery unit 30 stores the water in the tank main body 10 by driving the circulating water pump 51. The deaerated water thus circulated in the circulating water line 50 is sprayed from the spraying device 52. The flash steam relief valve 41 is closed. Thereby, the flash steam introduced into the flash steam recovery unit 30 is cooled and condensed by the deaerated water (spray water) sprayed from the spray device 52. The flash steam condensed in the flash steam recovery unit 30 is condensed at the lower part of the flash steam recovery unit 30. The condensed water collected at the lower part of the flash steam recovery unit 30 is introduced into the drain introduction pipe 20 from the drain introduction opening 21 of the drain introduction pipe 20 and is collected in the tank body 10.

  In this embodiment, the degassed water flash steam recovery apparatus 1 includes the pressure equalization line L4 that allows the drain recovery line L2 to communicate with the inside of the flash steam recovery unit 30. Thereby, the pressure inside the drain recovery line L <b> 2 and the pressure inside the flash steam recovery unit 30 when the flash steam is condensed in the flash steam recovery unit 30 can be equalized. Therefore, no negative pressure is generated in the flash steam recovery unit 30, and noise and vibration such as water hammer caused by drain can be suppressed.

  In the present embodiment, the flash steam recovery unit 30 includes a plate member in which a plurality of through holes are formed, and the spray device 52 is disposed above the punching plate 31. Thereby, the flash steam introduced into the flash steam recovery part 30 from the drain recovery line L2 and the deaerated water sprayed from the spray device 52 can be brought into contact more effectively. Therefore, the flash steam recovery rate can be further improved.

  In the present embodiment, the drain introduction opening 21 is formed on the peripheral surface of the drain introduction pipe 20. Thereby, the condensed water introduced into the drain introduction pipe 20 can be suitably collected in the tank body 10 along the inner surface of the drain introduction pipe 20.

  On the other hand, when the temperature of the deaerated water stored in the tank body 10 is equal to or higher than the first temperature, the circulating water pump 51 is stopped, and thus the deaerated water is not sprayed from the spray device 52. Further, the flash steam relief valve 41 is opened. The flash steam recovery unit 30 communicates with the outside via a flash steam escape line 40. Thereby, the flash steam introduced into the flash steam recovery unit 30 is discharged to the outside from the flash steam escape line 40. Therefore, it is possible to suppress the vibration and noise of the drain pipe and the tank body 10 that are generated due to the introduction of the flash vapor into the tank body 10 through the drain introduction pipe 20.

  According to the flash steam recovery apparatus 1 for degassed water according to the present embodiment described above, the following effects can be obtained.

  (1) The flush steam recovery apparatus 1 for deaerated water is arranged so that the distal end portion surrounds the drain introduction pipe 20 arranged in the liquid phase part of the tank body 10 and the proximal end side of the drain introduction pipe 20. A flash steam recovery unit 30, a flash steam release line 40 connected to the flash steam recovery unit 30, a flash steam release valve 41 that opens and closes the flash steam release line 40, and degassed water to the flash steam recovery unit 30. A circulating water line 50 to be circulated, a circulating water pump 51, and a controller 60 for controlling the flash steam relief valve 41 and the circulating water pump 51 based on the temperature inside the tank body 10 are configured. Accordingly, when the temperature of the circulating water is within a temperature range in which the flash steam is preferably condensed, the flash steam recovery unit 30 is driven by closing the flash steam relief valve 41 and driving the circulating water pump 51. The supplied flash steam can be suitably condensed by circulating water. Here, in the present embodiment, since the flash vapor recovery unit 30 is not in communication with the gas phase part of the tank body 10, air is not sucked into the gas phase part of the tank body 10 when the flash vapor is condensed. Therefore, it is possible to further reduce the dissolution of oxygen into the deaerated water stored in the tank body 10. Further, since the flash vapor recovery unit 30 is not in communication with the gas phase part of the tank main body 10, the flash vapor can be recovered without considering the temperature of the gas phase part of the tank main body 10. If the internal temperature of the tank body 10 is high enough to prevent the circulating water pump 51 from operating properly, the flash steam can be discharged by stopping the circulating water pump 51 and opening the flash steam relief valve 41. The gas can be discharged to the outside without being supplied to the gas phase portion of the tank body 10.

  (2) When the temperature of the deaerated water is equal to or higher than the first temperature, the controller 60 stops the circulating water pump 51 and opens the flash steam relief valve 41, and the temperature of the deaerated water is lower than the first temperature. In this case, the circulating water pump 51 was driven to close the flash steam relief valve 41. Thereby, flash vapor | steam can be collect | recovered suitably.

  (3) The flash steam recovery apparatus 1 for deaerated water is configured to include a pressure equalization line L4 that allows the drain recovery line L2 to communicate with the inside of the flash steam recovery unit 30. Thereby, the pressure inside the drain recovery line L <b> 2 and the pressure inside the flash steam recovery unit 30 when the flash steam is condensed in the flash steam recovery unit 30 can be equalized. Therefore, generation of negative pressure in the flash steam recovery unit 30 can be suppressed, and generation of noise and vibration such as water hammer caused by drain can be suppressed.

As mentioned above, although preferable one Embodiment of the flash vapor recovery apparatus 1 for deaerated water of this invention was described, this invention is not restrict | limited to embodiment mentioned above, It can change suitably.
For example, in this embodiment, the flash steam recovery apparatus 1 for degassed water is applied to the boiler system 100 configured by one boiler 110, but is not limited thereto. That is, you may apply the flash vapor recovery apparatus for deaerated water to the boiler system comprised by several boilers.

1 Flash steam recovery device for deaerated water 10 Tank body 13 Temperature sensor (temperature measurement unit)
20 Drain introduction pipe 30 Flash steam recovery part 40 Flash steam relief line 41 Flash steam relief valve 50 Circulating water line 51 Circulating water pump 60 Control part L2 Drain recovery line L4 Pressure equalization line

Claims (3)

A tank body for storing deaerated water;
A drain introduction pipe having a distal end portion disposed at a liquid phase portion inside the tank body and a proximal end portion disposed outside the tank body;
A flash steam recovery part disposed so as to surround the drain introduction pipe on the proximal end side of the drain introduction pipe;
A drain recovery line having a tip disposed inside the flash steam recovery section and supplying drain and flash steam to the flash steam recovery section;
A flash steam escape line in which the proximal end side is connected to the flash steam recovery section and the distal end side is opened to the outside;
A flash steam relief valve disposed in the flash steam relief line to open and close the flash steam relief line;
A circulating water line for connecting the tank body and the flash steam recovery section, and circulating deaerated water stored in the tank body to the flash steam recovery section;
A circulating water pump disposed in the circulating water line;
A temperature measuring unit for measuring the temperature of the deaerated water stored in the tank body;
A flash steam recovery apparatus for deaerated water, comprising: a controller that controls the flash steam relief valve and the circulating water pump based on the temperature of the deaerated water measured by the temperature measuring unit. The controller is
When the temperature of the deaerated water measured by the temperature measuring unit is equal to or higher than the first temperature, the circulating water pump is stopped and the flash steam relief valve is opened.
2. The deaeration water use according to claim 1, wherein when the temperature of the deaerated water measured by the temperature measuring unit is lower than the first temperature, the circulating water pump is driven to close the flash steam relief valve. Flash steam recovery device.   The flash steam recovery apparatus for deaerated water according to claim 1 or 2, further comprising a pressure equalization line for communicating the drain recovery line and the inside of the flash steam recovery section.

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