JP2016080192A - Steam generation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam generation device capable of suppressing increase of a manufacturing cost, and excellent in durability.SOLUTION: A steam generation device 1 includes: a tank part 2 having an evaporation tank 21 and a water header 22; a tube 25 arranged inside the evaporation tank; a spray nozzle 23 arranged inside the evaporation tank 21; a spray water line L4 supplying water stored in the water header 22, as spray water, to the spray nozzle 23; a spray water pump 7; a heat source fluid supply line L1 supplying heat source fluid to the tube 25; a heat source fluid discharge line L2 discharging heat source fluid; a bypass line L8 connecting the heat source fluid supply line L1 and the heat source fluid discharge line L2; a flow passage switching part 15 switching a flow passage of heat source fluid circulating in the heat source fluid supply line L1 to the side of the tube or the side of the bypass line; and heating means 50 heating the evaporation tank 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a steam generator.

  Conventionally, boilers that generate steam by burning fuel to boil water are widely used as steam generators. On the other hand, for the purpose of effectively using the energy of waste heat generated in factories or the like, a steam generator that generates steam using waste heat as a heat source has been proposed (see, for example, Patent Document 1). According to the steam generator proposed in Patent Document 1, steam can be taken out using hot water having a relatively low temperature of about 90 ° C. as a heat source.

  As such a steam generator capable of taking out steam using hot water having a relatively low temperature as a heat source, a shell-and-tube heat exchanger including a tank and a tube arranged to penetrate the inside of the tank. A steam generation apparatus using the above is also known. If a shell-and-tube heat exchanger is used, waste heat generated in a factory or the like (for example, about 90 ° C. waste hot water) is circulated through the tube as a heat source fluid, and hot water of about 80 ° C. is supplied inside the tank. By spraying on the tube, it is possible to generate steam using waste heat.

JP 2010-164223 A

  By the way, when the steam generator using the shell-and-tube heat exchanger is started, the heat source fluid is supplied to the heat exchanger in the cooled state, so that the tube through which the heat source fluid flows is quickly heated. On the other hand, the tank needs a predetermined time to be heated. Therefore, when starting up the steam generator, the difference in thermal expansion due to the temperature difference between the tube and the tank causes a load on the joint between the tube and the tank, which causes a decrease in the durability of the steam generator. It was.

  In order to eliminate such a problem of the load applied to the joint between the tube and the tank at the time of startup, it is conceivable to use a member having elasticity such as an expansion joint at the joint between the tube and the tank. However, when a stretchable member is used at the joint between the tube and the tank, the number of parts involved in the production of the steam generator increases, which increases the production cost and production man-hour of the steam generator.

  Accordingly, an object of the present invention is to provide a steam generator that can suppress an increase in manufacturing cost and is excellent in durability.

  The present invention includes an evaporating tank in which steam is generated, a tank portion provided below the evaporating tank, and having a water header for storing water that has not evaporated in the evaporating tank, and the evaporating tank A tube extending in the horizontal direction in which the heat source fluid flows, a spray nozzle disposed above the tube in the evaporation tank and spraying water on the tube, and the water header A spray water line for supplying water stored in the spray nozzle to the spray nozzle, a spray water pump provided in the spray water line, a heat source fluid supply line for supplying a heat source fluid to the tube, and the tube A heat source fluid discharge line that discharges the heat source fluid that has circulated, and a bypass that connects the heat source fluid supply line and the heat source fluid discharge line Generating steam, and a flow path switching unit for switching the flow path of the heat source fluid flowing through the heat source fluid supply line to the tube side or the bypass line side, and a heating means for heating the evaporation tank Relates to the device.

  In addition, the steam generator includes a tank temperature measuring unit that measures the surface temperature of the evaporation tank, a heat source fluid temperature measuring unit that measures the temperature of the heat source fluid, and a startup time that controls the operation of the steam generator during startup. A control unit, and the start-up control unit includes a spray water pump start unit that drives the spray water pump, and the difference between the temperature of the heat source fluid and the surface temperature of the evaporation tank at the start is a first threshold value. A heating means controller that activates the heating means when the heating means is exceeded, and a flow path switching portion that causes the flow path of the heat source fluid to be on the bypass line side when the heating means is activated. It is preferable to include a first flow path control unit to be controlled.

  Further, the start-up control unit is configured so that the flow path of the heat source fluid is on the tube side when the difference between the temperature of the heat source fluid and the surface temperature of the evaporation tank falls below a second threshold value. A second flow path control unit for controlling the switching unit, wherein the heating unit control unit is configured to control the heating unit when the difference between the temperature of the heat source fluid and the surface temperature of the evaporation tank falls below a second threshold value. It is preferable to stop activation.

  In addition, the steam generator includes a tank temperature measuring unit that measures the surface temperature of the evaporation tank, a heat source fluid temperature measuring unit that measures the temperature of the heat source fluid, and a startup time that controls the operation of the steam generator during startup. A control unit, and the start-up control unit includes a spray water pump start unit that drives the spray water pump, and the difference between the temperature of the heat source fluid and the surface temperature of the evaporation tank at the start is a first threshold value. The flow path based on the surface temperature of the evaporating tank measured by the tank temperature measuring unit when the heating means is activated and the heating means control unit that activates the heating means when the temperature exceeds It is preferable to include a first flow path control unit that controls the switching unit to adjust the flow rate of the heat source fluid that flows through the tube.

  In the steam generator, it is preferable that the heating means is constituted by a tape heater attached to the surface of the evaporation tank.

  In the steam generator, it is preferable that the heating means includes a steam supply line that supplies steam to the inside of the evaporation tank, and a steam supply source that supplies steam to the steam supply line.

  ADVANTAGE OF THE INVENTION According to this invention, the increase in manufacturing cost can be suppressed and the steam generator excellent in durability can be provided.

It is a figure showing the outline of the steam generator concerning a 1st embodiment of the present invention. It is a perspective view which shows the tank part (evaporation tank) in the steam generator which concerns on 1st Embodiment. It is sectional drawing of the tank part in the steam generator which concerns on 1st Embodiment. It is a figure which shows the outline of the steam generator which concerns on 3rd Embodiment of this invention.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram schematically illustrating a steam generator according to an embodiment of the present invention.
The steam generator 1 of this embodiment generates low-pressure steam using a relatively low-temperature heat source fluid such as waste warm water generated in a factory or the like.

  As shown in FIGS. 1 to 3, the steam generator 1 includes a tank unit 2, a steam outlet unit 24 provided in the tank unit 2, a tube 25 and a spray nozzle 23 disposed inside the tank unit 2. , A tape heater 50 as a heating means, a hot water supply line L1 as a heat source fluid supply line, a hot water discharge line L2 as a heat source fluid discharge line, a steam outlet line L3, a spray water line L4, and a continuous blow line L5, the concentration blow line L6, the makeup water line L7, the bypass line L8, the feed water heat exchanger 3, the tape heater 50 as a heating means, and the control part 90 are provided. “Line” is a general term for lines capable of flowing fluid such as flow paths, paths, and pipelines.

The tank unit 2 includes a plurality of evaporation tanks 21, one water header 22, and a water level gauge 27. Each of the plurality of evaporation tanks 21 generates steam.
The water header 22 is disposed below the plurality of evaporation tanks 21. The water header 22 stores water that has not become steam inside the evaporation tank 21.

  The water level indicator 27 detects the water level stored in the water header 22. More specifically, the water level gauge 27 includes a cylindrical main body 271 and a plurality of electrode bars 272 disposed inside the main body 271. The main body 271 is disposed at the same height as the water header 22. The lower end portion of the main body 271 is connected to the lower end portion of the water header 22 via a spray water line L4 described later. Moreover, the upper end part of the main body 271 is connected to the vapor | steam derivation | leading-out line L3 mentioned later. Thereby, the water level inside the water level gauge 27 (main body 271) becomes equal to the water level inside the water header 22.

The vapor outlet 24 is provided on each of the plurality of evaporation tanks 21. The steam deriving unit 24 derives the steam generated in the evaporation tank 21.
The tube 25 extends in the horizontal direction inside the evaporation tank 21. Inside the tube 25, hot water serving as a heat source fluid flows.

The spray nozzle 23 is disposed above the tube 25 inside the evaporation tank 21. The spray nozzle 23 sprays water toward the tube 25.
The tape heater 50 is disposed on the surface of the evaporation tank 21 and warms the evaporation tank 21.
Specific configurations of the tank unit 2, the vapor outlet unit 24, the spray nozzle 23, the tube 25, and the tape heater 50 will be described later.

  The hot water supply line L1 supplies hot water as a heat source fluid to the tube 25. The upstream side of the hot water supply line L1 is connected to a waste heat source that supplies hot water. The downstream side of the hot water supply line L1 is connected to one end of the tube 25 (a first flow path 251 described later). A hot water temperature sensor 11 as a heat source fluid temperature measuring unit is disposed in the hot water supply line L1. In the present embodiment, the hot water temperature sensor 11 is disposed on the upstream side of a later-described three-way valve 15 in the hot water supply line L1. The warm water temperature sensor 11 measures the temperature of warm water flowing through the warm water supply line L1.

  The hot water discharge line L2 circulates inside the tube 25 and discharges the hot water used as a heat source to the outside. The upstream side of the hot water discharge line L2 is connected to the other end of the tube 25 (a sixth flow path 256 described later). The warm water discharge line L2 is provided with a drain warm water temperature sensor 12 that measures the temperature of the warm water flowing through the tube 25. In the present embodiment, the exhaust warm water temperature sensor 12 is disposed on the upstream side (near the connection portion with the tube 25) in the warm water discharge line L2.

  The steam lead line L3 leads the steam generated inside the evaporation tank 21. The upstream side of the steam outlet line L3 is connected to the steam outlet 24. The downstream side of the steam outlet line L3 is connected to an ejector, a steam compressor, etc. (not shown).

The spray water line L4 connects the water header 22 and the spray nozzle 23, and supplies the water stored in the water header 22 to the spray nozzle 23 as spray water. In the spray water line L4, a spray water pump 7 and a spray water temperature sensor 13 as a spray water temperature measuring unit are arranged. In the present embodiment, the spray water temperature sensor 13 is disposed on the downstream side of the spray water pump 7 in the spray water line L4.
The spray water pump 7 pumps water stored in the water header 22 to the spray nozzle 23. The spray water temperature sensor 13 is disposed on the downstream side of the spray water pump 7 in the spray water line L4, and measures the temperature of the spray water flowing through the spray water line L4.

  The continuous blow line L5 and the concentration blow line L6 branch from the spray water line L4. The continuous blow line L5 and the concentrated blow line L6 drain a part of the water stored in the water header 22. The open / close valve 5 and the open / close valve 6 are arranged in the continuous blow line L5 and the concentration blow line L6, respectively.

The makeup water line L7 connects the water header 22 and a storage tank or the like (not shown) that stores water. The makeup water line L7 supplies makeup water to the water header 22. A makeup water pump 8, a check valve 9, and a makeup water temperature sensor 14 are arranged in the makeup water line L7.
The makeup water pump 8 pressurizes water supplied from a storage tank or the like and supplies it to the inside of the water header 22. The check valve 9 blocks the flow of water to the upstream side of the makeup water line L7 and allows supply of makeup water to the water header 22 through the makeup water line L7 when a water pressure higher than a predetermined pressure is received. To do. The makeup water temperature sensor 14 is disposed in the vicinity of the inlet of the water header 22 in the makeup water line L <b> 7 and measures the temperature of the makeup water supplied to the water header 22.

  The bypass line L8 connects the warm water supply line L1 and the warm water discharge line L2, and bypasses the warm water flowing through the warm water supply line L1 to the warm water discharge line L2 without passing through the tube 25. A three-way valve 15 as a flow path switching unit is disposed at a connection portion between the bypass line L8 and the hot water supply line L1. The three-way valve 15 switches the flow path of the hot water flowing through the hot water supply line L1 to the tube 25 side or the bypass line L8 side.

  The feed water heat exchanger 3 performs heat exchange between the hot water flowing through the hot water discharge line L2 and the water flowing through the makeup water line L7. Thereby, the water supplied to the water header 22 is heated by the warm water flowing through the warm water discharge line L2.

  The control unit 90 controls the operation of the steam generator 1 by controlling various valves and the like based on information detected by various sensors. For example, the control unit 90 controls the spray water pump 7 and the makeup water pump 8 based on the water level detected by the water level gauge 27, and performs water supply control of the steam generator 1. Further, the control unit 90 performs start-up control for warming up the tank unit 2 when the steam generator 1 is started. Details of control of the steam generator 1 by the controller 90 will be described later.

Next, the structure of the tank part 2, the vapor | steam derivation | leading-out part 24, the tube 25, the spray nozzle 23, and the tape heater 50 is demonstrated, referring FIG.2 and FIG.3.
FIG. 2 is a perspective view showing the tank unit 2 of the present embodiment. 3A is a cross-sectional view of the evaporation tank 21 of FIG. 2 cut along a plane perpendicular to the depth direction LD and passing through a portion where the evaporation tank 21 and the spray water line L4 are connected. It is sectional drawing (sectional drawing of one evaporation tank 21) observed from (X direction). FIG. 3B shows that the evaporation tank 21 is cut at a center portion in the width direction WD of the evaporation tank 21 and perpendicular to the width direction WD of the evaporation tank 21, and the side surface direction (Y direction) of the evaporation tank 21. It is sectional drawing observed from.

In the present embodiment, the tank unit 2 includes four evaporation tanks 21 and one water header 22.
As shown in FIGS. 2 and 3, the evaporating tank 21 has a length (height) H1 in the height direction HD and a length (width) W1 in the width direction WD from the length (depth) D1 in the depth direction LD. Is also formed in a short rectangular parallelepiped shape. The plurality of evaporation tanks 21 are connected in the width direction WD. The evaporation tank 21 is provided with a tank temperature sensor 16 as a tank temperature measurement unit. The tank temperature sensor 16 measures the surface temperature of the evaporation tank 21.
The water header 22 is disposed below the central region of the evaporation tank 21 in the depth direction LD. In the present embodiment, the water header 22 is formed in a cylindrical shape extending across the width direction WD of the plurality of evaporation tanks 21.
The evaporation tank 21 and the water header 22 are connected via a plurality of pipes 26. More specifically, the upper ends of the plurality of pipes 26 are respectively connected to the lower surfaces of the plurality of evaporation tanks 21. The lower ends of the plurality of pipes 26 are connected to the upper part of the circumferential surface of the water header 22.

  The vapor outlet 24 is provided in the central region in the width direction WD of the evaporation tank 21 and in the central region in the depth direction LD of the evaporation tank 21.

  The tubes 25 extend in the depth direction LD of the evaporation tank 21, are arranged in the width direction WD of the evaporation tank 21, and are further arranged in the height direction HD of the evaporation tank 21. Further, the interval W2 between the tubes 25 arranged at the center portion in the width direction WD of the evaporation tank 21 is narrower than the interval W3 between the tubes 25 arranged at the side portions in the width direction WD of the evaporation tank 21. That is, the number of tubes 25 arranged in the central portion of the evaporation tank 21 in the width direction WD is larger than the number of tubes 25 arranged in the side portions of the evaporation tank 21 in the width direction WD.

  In the present embodiment, as shown in FIG. 3, the tube 25 includes a first flow path 251, a second flow path 252, a third flow path 253, a fourth flow path 254, a fifth flow path 255, and a sixth flow path. 256 is comprised.

The first flow path 251 includes a plurality of tubes 25 arranged below the evaporation tank 21 in the height direction HD. The upstream end of the first flow path 251 is connected to the hot water supply line L1. The first flow path 251 circulates warm water from the front side of the evaporation tank 21 toward the back side (in the first direction) inside the evaporation tank 21.
The second flow path 252 is disposed adjacent to the width direction WD of the first flow path 251. The upstream end of the second flow path 252 is connected to the downstream end of the first flow path 251. The second flow path 252 circulates hot water inside the evaporation tank 21 from the back side to the near side of the evaporation tank 21 (in the second direction opposite to the first direction).

The third channel 253 is disposed adjacent to the width direction WD of the second channel 252. The upstream end of the third flow path 253 is connected to the downstream end of the second flow path 252. The third flow path 253 circulates hot water from the front side of the evaporation tank 21 toward the back side inside the evaporation tank 21.
The fourth channel 254 is disposed on the upper side of the third channel 253 in the height direction HD. The upstream end of the fourth channel 254 is connected to the downstream end of the third channel 253. The fourth flow path 254 circulates hot water from the back side of the evaporation tank 21 toward the front side in the evaporation tank 21.

The fifth channel 255 is arranged adjacent to the width direction WD of the fourth channel 254. The upstream end of the fifth flow channel 255 is connected to the downstream end of the fourth flow channel 254. The fifth channel 255 circulates hot water from the front side of the evaporation tank 21 toward the back side in the evaporation tank 21.
The sixth channel 256 is arranged adjacent to the width direction WD of the fifth channel 255. The upstream end of the sixth channel 256 is connected to the downstream end of the fifth channel 255. The sixth flow path 256 circulates hot water from the back side of the evaporation tank 21 toward the front side in the evaporation tank 21.

  According to the tube 25 described above, the hot water supplied from the hot water supply line L1 is folded after flowing through the first flow path 251 from the front side in the depth direction LD of the evaporation tank 21 to the back side, and thus the second flow path 252. Is circulated from the back side of the evaporation tank 21 to the front side. Further, the hot water has the third channel 253 from the near side to the far side, the fourth channel 254 from the far side to the near side, the fifth channel 255 from the near side to the far side, and the sixth channel 256. After circulating from the back side to the near side, it is discharged from the hot water discharge line L2.

  A plurality of spray nozzles 23 are arranged in the center region in the width direction WD of the evaporation tank 21 with a predetermined interval in the depth direction LD of the evaporation tank 21. In the present embodiment, two spray nozzles 23 are arranged on the back side and the near side of the steam outlet 24. The spray angle of the spray nozzle 23 is wide and close to 180 °.

  The tape heater 50 is attached to the surface of each of the four evaporation tanks 21.

The steam generator 1 of this embodiment operates as follows.
First, hot water of about 90 ° C., for example, serving as a heat source from the waste heat source is supplied to the tube 25 through the hot water supply line L1. The hot water supplied to the tube 25 flows through the inside of the evaporation tank 21 in the order of the first flow path 251 to the sixth flow path 256.
On the other hand, spray water is sprayed from the spray nozzle 23 toward the tube 25 inside the evaporation tank 21. Further, the inside of the evaporation tank 21 is maintained at a negative pressure (for example, -0.043 MPaG). Thereby, the hot water which distribute | circulates the tube 25 is deprived of heat with spray water, falls to about 85 degreeC, and is discharged | emitted through the warm water discharge line L2.

  In addition, a thin liquid film is formed on the surface of the tube 25 through which warm water flows by spraying water at about 80 ° C. from the spray nozzle 23. Thus, in a state where the negative pressure is maintained, a thin liquid film is formed on the surface of the tube 25, so that the temperature difference between the hot water flowing through the tube 25 and the water sprayed by the spray nozzle 23 is increased. Even when it is relatively small (for example, about 9 ° C.), steam can be generated efficiently.

The steam generated inside the evaporation tank 21 is led out from the steam lead-out unit 24 and supplied to an ejector, a steam compressor, and the like through the steam lead-out line L3.
Water that has not become steam inside the evaporation tank 21 is stored in the water header 22. The water stored in the water header 22 is pumped up to the spray nozzle 23 by the spray water pump 7 through the spray water line L4 and sprayed on the tube 25 again.

  The continuous blow line L5 and the concentrated blow line L6 drain the water stored in the water header 22. The continuous blow line L5 always discharges a fixed amount of water by opening the on-off valve 5 or discharges a fixed amount of water every fixed time. The concentration blow line L6 monitors the concentration value of chloride ions etc. of the water stored in the tank unit 2, and when the value exceeds a certain standard, the on-off valve 6 is opened to discharge a certain amount of water. To do.

  When the amount of water circulating between the spray water line L4 and the tank unit 2 is small (when the water level detected by the water level gauge 27 falls below a predetermined water level), the makeup water line L7 to the water header 22 Make-up water is supplied. The water replenished by the makeup water line L7 is about 20 ° C. The water replenished through the replenishing water line L7 is heat-exchanged with the hot water flowing through the warm water discharge line L2 by the feed water heat exchanger 3. The water supplied by the makeup water line L7 is heated to, for example, about 40 ° C. by exchanging heat with the warm water flowing through the warm water discharge line L2.

  When the shell and tube type steam generator as described above is started, hot water is supplied to the evaporating tank 21 that is in a cooled state, so that the tube 25 through which the hot water flows is quickly heated. The evaporation tank 21 requires a predetermined time until it is heated. Therefore, when the steam generator is started, a load is applied to the joint between the tube 25 and the evaporation tank 21 due to a difference in thermal expansion caused by the temperature difference between the tube 25 and the evaporation tank 21.

Therefore, in the steam generator 1 of the present embodiment, the control unit 90 includes the start-up control unit 80 to reduce the load applied to the joint portion between the tube 25 and the evaporation tank 21 at the start-up.
The start-up control unit 80 stops the flow of hot water to the tube 25 side until the surface temperature of the evaporation tank 21 rises to a predetermined temperature when the steam generator 1 is started up, and the evaporation heater 21 uses the tape heater 50 to stop the evaporation tank. By heating 21, the evaporation tank 21 and the tube 25 are heated without causing a temperature difference.
Specifically, the startup control unit 80 includes a spray water pump startup unit 81, a heating means control unit 82, a first channel control unit 83, and a second channel control unit 84.

The spray water pump activation unit 81 activates the spray water pump 7 when the steam generator 1 is activated.
When the operation of the spray water pump 7 is started, the heating means controller 82 is a difference between the temperature of the hot water measured by the hot water temperature sensor 11 and the surface temperature of the evaporation tank 21 measured by the tank temperature sensor 16. Is higher than a first threshold value (for example, 30 ° C.), the tape heater 50 is activated to start heating the evaporation tank 21.
The first flow path control unit 83 sets the three-way valve 15 so that the flow path of the hot water flowing through the hot water supply line L1 is on the bypass line L8 side when the tape heater 50 is activated by the heating means control unit 82. Control. Thereby, circulation of warm water to the tube 25 side is stopped.

When the temperature of the evaporation tank 21 rises, the second flow path control unit 84 controls the three-way valve 15 so that the flow path of the hot water flowing through the hot water supply line L1 is on the tube 25 side. More specifically, the second flow path controller 84 determines that the difference between the temperature of the hot water measured by the hot water temperature sensor 11 and the surface temperature of the evaporation tank 21 measured by the tank temperature sensor 16 is a second threshold (for example, , 30 ° C.), the three-way valve 15 is controlled so that the flow path of the hot water is on the tube 25 side. Thereby, the hot water which distribute | circulates the hot water supply line L1 is supplied to the tube 25 side, and in the evaporation tank 21, spray water is heated with the warm water which distribute | circulates the inside of the tube 25, and a vapor | steam is produced | generated.
In this case, the heating means controller 82 stops the activation of the tape heater 50.

  According to the steam generator of this embodiment demonstrated above, there exist the following effects.

  (1) The steam generator 1 is configured in a so-called shell-and-tube type having an evaporation tank 21 and a tube 25. The steam generator 1 includes a tape heater 50 for heating the evaporation tank 21 and a hot water supply line L1. The flow path of the warm water that circulates is configured to include the three-way valve 15 that switches to the tube 25 side or the bypass line L8 side. Thereby, at the time of starting of the steam generator 1, the evaporation tank 21 can be heated by the tape heater 50 in a state where the three-way valve 15 is switched to the bypass line L8 side and the supply of the hot water to the tube 25 is stopped. Then, the hot water can be supplied to the tube 25 in a state where the evaporation tank 21 is heated by switching the three-way valve 15 to the tube 25 side while the evaporation tank 21 is heated to a predetermined temperature. Therefore, even if hot water is supplied to the tube 25, it is possible to prevent a large temperature difference between the tube 25 and the evaporation tank 21, so that the load applied to the joint portion between the tube 25 and the evaporation tank 21 can be reduced. As a result, the durability of the steam generating device can be improved while suppressing the manufacturing cost of the steam generating device 1.

  (2) The steam generator 1 includes a startup control unit 80. The startup control unit 80 includes a spray water pump startup unit 81 that drives the spray water pump 7 at startup, and the temperature of hot water at startup. And the heating means control unit 82 for starting the tape heater 50 when the difference between the surface temperature of the evaporation tank 21 exceeds the first threshold value, and the hot water flow path when the tape heater 50 is started. And a first flow path control unit 83 that switches to the L8 side. Thereby, when the evaporation tank 21 is cold at the time of starting, the evaporation tank 21 can be heated by the tape heater 50 while circulating the spray water, so that the evaporation tank 21 and the tube 25 can be similarly heated. Therefore, it is possible to further reduce the load applied to the joint portion between the tube 25 and the evaporation tank 21 at the time of activation.

  (3) The start-up control unit includes a second flow path control unit 84 that switches the flow path of the hot water to the tube 25 side when the difference between the temperature of the hot water and the surface temperature of the evaporation tank 21 falls below the second threshold value. When the difference between the temperature of the hot water and the surface temperature of the evaporation tank 21 falls below the second threshold, the heating means control unit 82 stops the activation of the tape heater 50. Thereby, when the evaporation tank 21 is heated, warm water is circulated to the tube 25 side to start steam generation. Therefore, the warm-up control when starting up the steam generator 1 can be terminated at an appropriate timing.

  (4) The heating means is constituted by the tape heater 50. Thereby, the heating means can be easily installed in the evaporation tank 21 and the temperature can be easily controlled.

  Next, the steam generator 1 which concerns on 2nd Embodiment of this invention is demonstrated. The steam generator 1 of the second embodiment differs from the first embodiment in the control of the first flow path control unit 83. In the description after the second embodiment, the same constituent elements are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  In 2nd Embodiment, the steam generator 1 matches and memorize | stores the surface temperature of the evaporation tank 21, and the opening degree of the three-way valve 15 in the memory | storage part (not shown). The first flow path control unit 83 controls the three-way valve 15 based on the opening degree of the three-way valve 15 stored in the storage unit corresponding to the surface temperature of the evaporation tank 21 measured by the tank temperature sensor 16. To do. Thereby, when the surface temperature of the evaporation tank 21 is low at the time of starting of the steam generator 1, the opening degree of the three-way valve 15 toward the tube 25 is reduced to reduce the flow rate of the hot water flowing through the tube 25. Thus, since a large amount of hot water can be prevented from being introduced into the tube 25 abruptly, the temperature of the tube 25 can be prevented from rising excessively. Further, by increasing the flow rate of the hot water flowing to the tube 25 side as the surface temperature of the evaporation tank 21 rises, it is possible to shorten the time until the start of steam generation when the steam generator 1 is started.

  According to the steam generator 1 of 2nd Embodiment, there exist the following effects other than the effect of said (1), (3) and (4).

  (5) The first flow path control unit 83 controls the three-way valve 15 based on the surface temperature of the evaporation tank 21 measured by the tank temperature sensor 16 to adjust the flow rate of the hot water flowing through the tube 25 side. Thereby, at the time of starting, the evaporation tank 21 can be heated by the tape heater 50 while circulating the spray water, and the flow rate of the hot water flowing through the tube 25 can be adjusted according to the surface temperature of the evaporation tank 21. Therefore, since the evaporation tank 21 and the tube 25 can be heated quickly while preventing the temperature of the tube 25 from rising rapidly, the time required for warming up the steam generator 1 can be shortened.

  Next, a steam generator 1A according to a third embodiment of the present invention will be described with reference to FIG. The steam generator 1A of the third embodiment is different from the first embodiment and the second embodiment in the configuration of the heating means 50A.

  In the third embodiment, as shown in FIG. 4, the heating means 50A includes a boiler 51 as a steam supply source that generates steam, a steam supply line L9 that supplies steam to the inside of the evaporation tank 21, and a steam supply. And a motor valve 52 as a flow rate adjusting valve disposed in the line L9.

  In the third embodiment, when the operation of the spray water pump 7 is started, the heating means control unit 82 determines that the difference between the temperature of the hot water and the surface temperature of the evaporation tank 21 is the first threshold (for example, 30 ° C.). Exceeds the value, the motor valve 52 is opened and supplied to the inside of the evaporation tank 21 to start heating the evaporation tank 21. The steam supplied to the inside of the evaporation tank 21 is condensed and used as spray water.

  According to 1 A of steam generators of 3rd Embodiment demonstrated above, there exist the following effects besides the effect of said (1)-(3), (5).

  (6) The heating means 50A includes the steam supply line L9 and the boiler 51. Thereby, since the evaporation tank 21 can be heated using the steam generated in the steam system including the steam generator 1A, the heating means 50A can be configured without providing a separate heat source. Moreover, since the vapor | steam utilized for heating can be utilized as spray water, spray water can be heated rapidly and the efficiency of 1 A of steam generators can be improved more.

The preferred embodiments of the steam generator according to the present invention have been described above. However, the present invention is not limited to the above-described embodiments and can be modified as appropriate.
For example, in the first to third embodiments, hot water is used as the heat source fluid, but the present invention is not limited to this. That is, other fluids such as exhaust gas and air may be used as the heat source fluid.

  Further, the heating means is not limited to the tape heater 50 and the boiler 51. That is, other heating means that can heat the evaporation tank may be used.

  Moreover, in 1st Embodiment-3rd Embodiment, although the flow-path switching part was comprised by the three-way valve 15, it does not restrict to this. That is, the flow path switching unit may be configured by combining a plurality of valves.

  Moreover, in 1st Embodiment-3rd Embodiment, although the 1st threshold value and the 2nd threshold value were set to the same magnitude | size, it is not restricted to this. That is, for example, the first threshold value may be set higher (larger) than the second threshold value.

  Further, in the first embodiment, the second flow path control unit 84 causes the hot water flow path to be on the tube 25 side when the difference between the temperature of the hot water and the temperature of the evaporation tank 21 falls below the second threshold value. Although the three-way valve 15 is controlled, it is not limited to this. That is, when the surface temperature of the evaporating tank 21 measured by the tank temperature sensor 16 rises to a predetermined temperature (for example, 80 ° C.), the hot water flow path is connected to the tube 25 side. You may control the three-way valve 15 so that it may become.

DESCRIPTION OF SYMBOLS 1 Steam generator 2 Tank part 7 Spray water pump 11 Hot water temperature sensor (heat source fluid temperature measurement part)
15 Three-way valve (flow path switching part)
16 Tank temperature sensor (tank temperature measuring part)
21 Evaporation tank 22 Water header 25 Tube 23 Spray nozzle 50 Tape heater (heating means)
50A Heating means 51 Boiler (steam supply source)
80 Start-up control unit 81 Spray water pump start-up unit 82 Heating means control unit 83 First flow path control unit 84 Second flow path control unit L1 Hot water supply line (heat source fluid supply line)
L2 Hot water discharge line (heat source fluid discharge line)
L4 Spray water line L8 Bypass line L9 Steam supply line

Claims (6)

An evaporating tank in which steam is generated, and a tank portion provided below the evaporating tank, and having a water header in which water that has not evaporated in the evaporating tank is stored;
A tube that extends in the horizontal direction inside the evaporation tank, and in which a heat source fluid flows;
A spray nozzle that is disposed above the tube inside the evaporation tank and sprays water on the tube;
A spray water line for supplying water stored in the water header to the spray nozzle as spray water;
A spray water pump provided in the spray water line;
A heat source fluid supply line for supplying a heat source fluid to the tube;
A heat source fluid discharge line for discharging the heat source fluid flowing through the tube;
A bypass line connecting the heat source fluid supply line and the heat source fluid discharge line;
A flow path switching unit that switches the flow path of the heat source fluid flowing through the heat source fluid supply line to the tube side or the bypass line side;
A steam generation device comprising: heating means for heating the evaporation tank. A tank temperature measuring unit for measuring the surface temperature of the evaporation tank;
A heat source fluid temperature measuring unit for measuring the temperature of the heat source fluid;
A start-up control unit that controls the operation of the steam generator at the start-up,
The startup control unit
A spray water pump starter for driving the spray water pump;
A heating means controller that activates the heating means when the difference between the temperature of the heat source fluid and the surface temperature of the evaporation tank exceeds a first threshold at the time of activation;
The steam generation according to claim 1, further comprising: a first flow path control unit that controls the flow path switching unit so that the flow path of the heat source fluid is on the bypass line side when the heating unit is activated. apparatus. The startup control unit
A second flow path that controls the flow path switching unit so that the flow path of the heat source fluid is on the tube side when the difference between the temperature of the heat source fluid and the surface temperature of the evaporation tank falls below a second threshold value. A control unit;
The steam generating device according to claim 2, wherein the heating means control section stops the activation of the heating means when the difference between the temperature of the heat source fluid and the surface temperature of the evaporation tank falls below a second threshold value. A tank temperature measuring unit for measuring the surface temperature of the evaporation tank;
A heat source fluid temperature measuring unit for measuring the temperature of the heat source fluid;
A start-up control unit that controls the operation of the steam generator at the start-up,
The startup control unit
A spray water pump starter for driving the spray water pump;
A heating means controller that activates the heating means when the difference between the temperature of the heat source fluid and the surface temperature of the evaporation tank exceeds a first threshold at the time of activation;
When the heating means is started, a flow rate of the heat source fluid to be circulated to the tube side is controlled by controlling the flow path switching unit based on the surface temperature of the evaporation tank measured by the tank temperature measurement unit. The steam generator according to claim 1, further comprising a one-flow path control unit.   The steam generator according to any one of claims 1 to 4, wherein the heating means is configured by a tape heater attached to a surface of the evaporation tank.   The steam generation according to any one of claims 1 to 4, wherein the heating means includes a steam supply line that supplies steam to the inside of the evaporation tank, and a steam supply source that supplies steam to the steam supply line. apparatus.

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