JP6492750B2 - Flash steam generator - Google Patents

Description

  The present invention relates to a flash steam generator that collects drain from an upstream steam utilization facility, re-evaporates it into flash steam and hot water, and supplies the flash steam to a downstream steam utilization facility. It is.

  Conventionally, as shown in Patent Documents 1 and 2, the flash steam generator is configured to collect the drain from the upstream steam utilization facility in the flash tank.

JP 2012-7762 A JP 2009-198038 A

  Conventionally, a recovery line for collecting drain into a flash tank includes an initial discharge line for discharging drain and a bypass line that bypasses the flash tank and connects the recovery line and a discharge line for discharging hot water from the flash tank. And a tank line for collecting the drain into the flash tank, and the tank line is disposed upstream of the bypass line. As a result, even when drain is sent to the bypass line, there is a considerable amount of drain that does not flow through the bypass line but flows into the tank line.

  Accordingly, an object of the present invention is to provide a flash steam generator that can reduce the amount of drain that does not flow to the bypass line but flows to the tank line when the drain is sent by bypassing the flash tank. To do.

The present invention is a flash steam generator that collects drain from an upstream steam utilization facility, re-evaporates it into flash steam and hot water, and supplies the flash steam to the downstream steam utilization facility. A recovery line for recovering the drain; a flash tank for separating the recovered drain into the flash steam and the hot water; and the flash steam from the flash tank and the downstream steam utilization facility. A first discharge line for discharging the warm water from the flash tank, and the recovery line includes a second discharge line for discharging the drain, and the flash tank. Bypass and connect the recovery line and the first discharge line, the bypass line and the drain to the flush A tank line for collecting the ink has a, in said return line, in order from the upstream side, the second discharge line, the bypass line, the tank line is disposed, the recovery line, a drain inlet, An inlet pipe extending downward from the drain inlet, and a connecting pipe connected to a lower end of the inlet pipe and extending in the horizontal direction, the connecting pipe in order from the upstream side, the second discharge line, It is characterized by branching downward to the bypass line and the tank line, respectively .

According to the above configuration, in the recovery line, by providing the second discharge line, the bypass line, and the tank line sequentially from the upstream side, when performing the initial discharge, the flow does not flow to the second discharge line but flows to the bypass line and the tank line. The amount of drain that flows into the tank line instead of flowing into the bypass line when bypassing can be reduced. In addition, when performing initial discharge or bypass, it is possible to reduce the amount of drain that does not flow to the second discharge line or the bypass line but flows to the tank line.

The present invention preferably further comprises the following configuration .
(1) a first branch portion branching from pre-Symbol communication pipe into the second discharge line is formed in the connecting portion between the communication pipe and the inlet pipe.
(2) the previous SL second discharge valve for opening and closing the second discharge line, a pressure detecting portion for detecting a pressure of the inlet pipe, and and control means for controlling the operation of the flash steam generator, The control means is configured to fully open the second discharge valve when the pressure detection means detects a predetermined pressure or more.

According to said structure ( 1 ), when performing initial discharge | emission, a drain can be easily poured into a 2nd discharge line.

According to the configuration ( 2 ), when the pressure in the inlet pipe becomes equal to or higher than the predetermined pressure, the clogging of the inlet pipe can be eliminated by opening the second discharge valve.

  In short, according to the present invention, it is possible to provide a flash steam generator that can reduce the amount of drain that does not flow into the bypass line but flows into the tank line when the drain is sent while bypassing the flash tank.

It is a schematic block diagram of the flash steam generator which concerns on embodiment of this invention. It is a schematic structure figure which shows the branch part to a 2nd discharge line, a bypass line, and a tank line in a collection line.

(overall structure)
FIG. 1 is a schematic configuration diagram of a flash steam generator according to an embodiment of the present invention. The flash steam generator 1 collects drain from the upstream steam utilization facility 11, re-evaporates it into flash steam and hot water, and supplies the flash steam to the downstream steam utilization facility 12. ing. The upstream steam utilization facility 11 utilizes steam supplied from a boiler or the like as a heat medium, and is composed of, for example, a heat exchanger. The steam utilization facility 12 on the downstream side uses the steam supplied from the flash steam generator 1 as a heat medium, and is composed of, for example, a heat exchanger.

  The flash steam generator 1 includes a flash tank 2 that separates drain recovered from the upstream steam utilization facility 11 into flash steam and hot water, a recovery line 3 that recovers drain to the flash tank 2, and flash from the flash tank 2. A supply line 4 for supplying steam to the steam utilization facility 12 on the downstream side, and a first discharge line 5 for discharging hot water from the flash tank 2 are provided. The supply line 4 is provided with a supply valve 41 that opens and closes the supply line 4, and the first discharge line 5 is provided with a first discharge valve 51 that opens and closes the first discharge line 5. The supply valve 41 and the first discharge valve 51 are motorized valves, respectively. Further, the flash steam generator 1 includes control means (not shown) for controlling the operation of the flash steam generator 1.

  The supply line 4 is provided with a steam control valve 42 on the upstream side of the supply valve 41, and flash steam that is not used among the flash steam generated in the flash tank 2 passes through the steam control valve 42 and is an open tank. 52 is discharged. Further, the hot water generated in the flash tank 2 is discharged to the open tank 52 via the first discharge valve 51. Note that the open tank 52 is open to the outside air.

  The recovery line 3 is provided with a strainer 31 for filtering impurities contained in the drain from the steam utilization facility 11 on the upstream side. In the recovery line 3, a tank line 8 for recovering the drain to the flash tank 2 is provided on the downstream side of the strainer 31.

  In the recovery line 3, an initial discharge line (for discharging the drain from the upstream steam utilization facility 11 without recovering it to the upstream side of the strainer 31 and downstream of the upstream steam utilization facility 11) A second discharge line 7 is provided. The second discharge line 7 is provided with an initial discharge valve (second discharge valve) 71 that opens and closes the second discharge line 7. Part of the drain from the upstream steam utilization facility 11 is discharged to the pit 72 via the second discharge valve 71.

  In the recovery line 3, a bypass line 6 that bypasses the flash tank 2 and connects the recovery line 3 and the first discharge line 5 is upstream of the strainer 31 and downstream of the second discharge line 7. Is provided. The bypass line 6 is provided with a bypass valve 61 for opening and closing the bypass line 6.

  The bypass valve 61 is an electric valve, and prevents the drain from flowing into the flash tank 2 when the operation of the flash steam generator 1 is stopped (when the operation switch is turned off), that is, the flash steam. In order to protect the generator 1, it is automatically opened. Further, the bypass valve 61 is of a battery drive type so as to be automatically opened even when the power is cut off at the time of power failure or the like. The bypass valve 61 is gradually opened by the attached electric motor when the operation switch is turned off. Further, even when the power is shut off, the battery is gradually opened by battery driving. Note that the bypass valve 61 may be of a spring return type so that it automatically opens when the power is shut off, such as during a power failure.

  The bypass line 6 is provided with a manual valve 62 that bypasses the bypass valve 61 in order to inspect and care for the bypass valve 61. The manual valve 62 is, for example, a ball valve.

  The flash tank 2 includes a water level sensor 21 and a float switch 22 as water level detection means for detecting the water level of the flash tank 2. The water level sensor 21 detects that the water level of the flash tank 2 is within a predetermined range, and the float switch 22 determines whether or not the water level of the flash tank 2 exceeds an alarm value exceeding the predetermined range. Is to be detected. The control means controls the opening degree of the first discharge valve 51 provided in the first discharge line 5 so that the water level of the flash tank 2 detected by the water level sensor 21 falls within a predetermined range. Further, the control means opens the bypass valve 61 when the water level of the flash tank 2 detected by the float switch 22 becomes equal to or higher than an alarm value.

  The flash tank 2 is provided with pressure detecting means (pressure sensor 23) for detecting the pressure in the gas phase portion of the flash tank 2. The control means adjusts the opening degree of the bypass valve 61 according to the detection result of the pressure sensor 23. And if the pressure sensor 23 detects more than predetermined pressure (1st setting pressure), a control means will open the bypass valve 61 fully.

  The control means gradually opens the bypass valve 61 when the operation of the flash steam generator 1 is stopped. As specific means for gradually opening the bypass valve 61, the time required for the normal bypass valve 61 to take from the fully closed state to the fully open state (for example, about 1 to 2 seconds) is more time (for example, about 5 seconds or more). It is conceivable that the fully opened state is applied.

  Further, the control means is configured to fully open the first discharge valve 51 when the operation of the flash steam generator 1 is stopped.

(Branch structure in the recovery line)
FIG. 2 is a schematic structural diagram showing a branching portion to the second discharge line 7, the bypass line 6 and the tank line 8 in the recovery line 3. As shown in FIG. 2, the recovery line 3 includes a drain inlet 32, an inlet pipe 33 extending downward from the drain inlet 32, a connecting pipe 34 connected to the lower end of the inlet pipe 33 and extending in the horizontal direction, It has. The communication pipe 34 includes, in order from the upstream side, a first branch 341 toward the second discharge line 7, a second branch 342 toward the bypass line 6, and a third branch 343 toward the tank line 8. It is formed downward. The first branch portion 341 is formed at the connection portion between the inlet pipe 33 and the connecting pipe 34, and the downstream end surface 341a of the first branch portion 341 has a curved surface so that the drain flow resistance is reduced. ing. Similarly, the upstream end surface 342a and the downstream end surface 342b of the second branch portion 342 are also curved so that the drain flow resistance is reduced. The third branch portion 343 is formed downward from the terminal end portion 344 of the connecting pipe 34. The upstream end surface 343a of the third branch portion 343 and the end surface 344a of the terminal end portion 344 are connected to the drain flow. The surface is curved to reduce the resistance. The second branch portion 342 is provided in the approximate center of the connecting pipe 34, that is, in the approximate center between the first branch portion 341 and the third branch portion 343. Further, the inner diameter of the branch portion 341, the inner diameter of the branch portion 342, and the inner diameter of the branch portion 343 are substantially the same.

  As shown in FIG. 1, the flash steam generator 1 includes pressure detection means (pressure sensor 331) that detects the pressure of the inlet pipe 33. When the pressure sensor 331 detects a predetermined pressure (first set pressure) or higher, the control means opens the second discharge valve 71 fully.

  The flash steam generator 1 operates as follows.

  In the steam utilization facility 11 on the upstream side, a part of the steam that has been used as a heat medium and has lost its latent heat is condensed and discharged as a drain. Since the drain discharged first has a low temperature as a drain and does not have high utility value, the drain is discharged to the pit 72 via the second discharge line 7. After removing the first drain, the second discharge valve 71 is closed, and the discharged drain is then sent to the flash tank 2 via the recovery line 3. Impurities and the like contained in the discharged drain are filtered by the strainer 31 provided in the recovery line 3. In general, the bypass valve 61 is closed, and the drain discharged from the upstream steam utilization facility 11 is sent to the flash tank 2 in its entirety.

  The flash tank 2 re-evaporates the drain received from the upstream steam utilization facility 11 and separates it into flash steam and hot water. The flash steam generated in the flash tank 2 is supplied to the downstream steam utilization facility 12 via the supply line 4. The flash steam that is not used in the downstream steam utilization facility 12 is discharged to the open tank 52 via the steam control valve 42.

  The hot water generated in the flash tank 2 is discharged to the open tank 52 via the first discharge line 5. Note that the opening degree of the first discharge valve 51 provided in the first discharge line 5 is adjusted based on the detection result of the water level by the water level sensor 21 provided in the flash tank 2, and as a result, the flash Control is performed so that the water level of the tank 2 falls within a predetermined range. Further, when the float switch 22 detects that the water level of the flash tank 2 is equal to or higher than the alarm value, the control means opens the bypass valve 61.

  While the flash steam generator 1 is operating, the control means adjusts the opening degree of the bypass valve 61 according to the detection result of the pressure sensor 23. And if the pressure sensor 23 detects more than predetermined pressure, a control means will open the bypass valve 61 fully.

  When the flash steam generator 1 is in operation, the control means fully opens the second discharge valve 71 when the pressure sensor 331 detects the first set pressure or higher.

  When the operation of the flash steam generator 1 is stopped, the control means gradually opens the bypass valve 61 and simultaneously opens the first discharge valve 51. Even after the bypass valve 61 is fully opened, the control means maintains the fully opened state of the first discharge valve 51.

  According to the flash steam generator 1 having the above-described configuration, the following effects can be exhibited.

(1) In the recovery line 3, the second discharge line 7, the bypass line 6, and the tank line 8 are provided in order from the upstream side to bypass the flash tank, and when the drain is sent, the tank does not flow to the bypass line 6. The amount of drain that flows into the line 8 can be reduced. Moreover, when performing initial discharge | emission, the quantity of the drain which does not flow into the 2nd discharge line 7, but flows into the bypass line 6 and the tank line 8 can be reduced.

(2) The communication pipe 34 includes, in order from the upstream side, a first branch 341 toward the second discharge line 7, a second branch 342 toward the bypass line 6, and a third branch 343 toward the tank line 8. Each is formed downward. That is, since the connecting pipe 34 is branched downward from the upstream side to the second discharge line 7, the bypass line 6, and the tank line 8, respectively, when performing initial discharge or bypass, The amount of drain that does not flow to the second discharge line 7 or the bypass line 6 but flows to the tank line 8 can be reduced.

(3) Since the 1st branch part 341 is formed in the connection part of the inlet pipe 33 and the connection pipe 34, when performing initial discharge | emission, it can flow easily a drain to a 2nd discharge line.

(4) When the pressure sensor 331 detects the first set pressure or higher, the control means is configured to fully open the second discharge valve 71. Therefore, when the pressure of the inlet pipe 33 becomes the first set pressure or higher, The clogging of the inlet pipe 33 can be eliminated by opening the second discharge valve 71. As a result, it is possible to avoid the influence on the upstream steam utilization facility 11 due to the pressure increase in the inlet pipe 33.

(5) The first branch portion 341 is formed downward from the inlet pipe 33, and the downstream end surface 341a is curved so that the resistance to drain flow is reduced. The drain is smoothly directed to the second discharge line 7.

(6) The second branch portion 342 is formed downward from the connecting pipe 34, and the upstream end surface 342a and the downstream end surface 342b are curved so that the resistance to drain flow is reduced. The drain that has flowed through the communication pipe 34 smoothly moves toward the bypass line 6.

(7) The third branch portion 343 is formed downward from the terminal end portion 344 of the connecting pipe 34, and the end surface 344a of the terminal end portion 344 is a curved surface so that the drain flow resistance is reduced. The drain that has flowed through the communication pipe 34 is smoothly directed toward the tank line 8.

(8) Since the control means adjusts the opening degree of the bypass valve 61 based on the detection result of the pressure sensor 23, the amount of drain entering the flash tank can be adjusted by the internal pressure of the flash tank. . Specifically, if the internal pressure of the flash tank increases, the amount of drain entering the flash tank can be reduced by increasing the opening of the bypass valve, and as a result, the internal pressure of the flash tank can be reduced.

(9) The control means is configured to fully open the bypass valve 61 when the pressure sensor 23 detects a predetermined pressure or higher. Therefore, when the internal pressure of the flash tank 2 exceeds the predetermined pressure, the bypass valve is fully opened. The internal pressure of the flash tank 2 can be reduced.

(10) Since the first discharge valve 51 is fully opened when the operation of the flash steam generator 1 is stopped, the control means opens the first discharge valve 51, so that the bypass valve When 61 is opened, the pressure applied to the first discharge valve 51 and the like can be relaxed.

  The bypass valve 61 can also be provided as a three-way valve at the connection point between the recovery line 3 and the bypass line 6 according to the embodiment. By switching the three-way valve, it is possible to control whether to maintain the flow to the flash tank 2 via the recovery line 3 or to switch to the flow to the bypass line 6.

  In the above embodiment, the flash steam generator 1 includes one flash tank 2, but the flash tank is not limited to one, and may include a plurality of flash tanks. In that case, the bypass line 6 and the bypass valve 61, and the second discharge line 7 and the second discharge valve 71 may be provided for each flash tank, and one each for the entire flash steam generator. It may be provided.

  In the above embodiment, the flash tank 2 includes a water level sensor 21 that detects a water level within a predetermined range and a float switch 22 that detects the water level of an alarm value as water level detection means for detecting the water level of the flash tank 2. However, only the water level sensor or only the float switch may be provided as the water level detection means. In this case, a water level within a predetermined range and a water level of an alarm value are detected by a water level sensor or a float switch.

  The present invention is not limited to the configuration described in the above embodiment, and can include various modifications that can be considered by those skilled in the art without departing from the content described in the claims.

  In the present invention, when the drain is sent by bypassing the flash tank, it is possible to provide a flash steam generator that can reduce the amount of drain that does not flow to the bypass line but flows to the tank line. Value is great.

DESCRIPTION OF SYMBOLS 1 Flash steam generator 2 Flash tank 21 Water level sensor 22 Float switch 23 Pressure sensor 3 Recovery line 31 Strainer 32 Drain inlet part 33 Inlet pipe 331 Pressure sensor 34 Connecting pipe 341 First branch part 341a Downstream end face 342 Second branch part 342a Upstream end face 342b Downstream end face 343 Third branch part 343a Upstream end face 344 Termination part 344a End face 4 Supply line 41 Supply valve 42 Steam regulating valve 5 First discharge line 51 First discharge valve 52 Open tank 6 Bypass line 61 Bypass valve 62 Manual valve 7 Second discharge line 71 Second discharge valve 72 Pit 8 Tank line 11 Steam utilization equipment on the upstream side 12 Steam utilization equipment on the downstream side

Claims (3)

A flash steam generator that collects drain from an upstream steam utilization facility, re-evaporates it into flash steam and hot water, and supplies the flash steam to a downstream steam utilization facility,
A recovery line for recovering the drain;
A flash tank for separating the recovered drain into the flash steam and the hot water;
A supply line for supplying the flash steam from the flash tank to the downstream steam utilization facility;
A first discharge line for discharging the warm water from the flash tank,
The recovery line includes a second discharge line that discharges the drain, a bypass line that bypasses the flash tank and connects the recovery line and the first discharge line, and recovers the drain to the flash tank. And a tank line
In the recovery line, in order from the upstream side, the second discharge line, the bypass line, the tank line are arranged,
The recovery line includes a drain inlet, an inlet pipe extending downward from the drain inlet, and a connecting pipe connected to a lower end of the inlet pipe and extending horizontally.
The flash steam generator according to claim 1, wherein the communication pipe is branched downward from the upstream side to the second discharge line, the bypass line, and the tank line .
The flash steam generator according to claim 1 , wherein a first branch portion branched from the communication pipe to the second discharge line is formed at a connection portion between the inlet pipe and the communication pipe.
A second discharge valve for opening and closing the second discharge line;
Pressure detecting means for detecting the pressure of the inlet pipe;
Control means for controlling the operation of the flash steam generator,
3. The flash steam generator according to claim 1 , wherein the control unit is configured to fully open the second discharge valve when the pressure detection unit detects a predetermined pressure or more. 4.

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