JP2016080002A - Condensed water discharge device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam generation nozzle type condensed water discharge device capable of enhancing discharge efficiency even when condensed water is rapidly increased.SOLUTION: A condensed water discharge device includes: a condensed water accumulation pipe for accumulating condensed water; a steam trap connected to the condensed water accumulation pipe, receiving the condensed water flowing from an input part with a body part, feeding the condensed water to a steam generation nozzle, and converting the condensed water into steam so as to be discharged to a discharge pipe through an outlet part; a cyclone connected to a condensed water extracting port of the steam trap; a water level sensor provided in the condensed water accumulation pipe and including an upper limit sensor and a lower limit sensor; a discharge valve constituted by a solenoid valve for discharging the condensed water passing through the cyclone to the discharge pipe; and a control section for opening the discharge valve so as to discharge the condensed water to the discharge pipe through the cyclone when it is detected that the water level in the condensed water accumulation pipe rises higher than the upper limit sensor and closing the discharge valve when it is detected that the water level lowers lower than the lower limit sensor.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a condensate discharge device having a steam generation nozzle, and more particularly to a condensate discharge device that automatically discharges condensate in a steam pipe and can follow the condensate even when the amount of condensate increases.

  The condensed water discharge device is a device that removes condensed water generated in the steam pipe. When the temperature drops or pressure is applied, a part of the steam becomes condensed water. However, if the condensed water in the steam pipe is not discharged, the original steam space is lost, resulting in a temperature drop and disconnection. Therefore, the condensate drain device is indispensable for the steam utilization facility.

  There are several systems for discharging condensed water in the steam pipe. There is a mechanical type that opens and closes the valve seat by sensing the presence or absence of condensed water in the steam pipe. For example, the float valve is a mechanical type that opens and closes the valve by moving the float up and down according to the amount of floating water.

  In the mechanical type, when the float of the movable part closes the valve seat, foreign matter may be caught and the steam may escape, or when the valve seat is closed, a part of the steam is released. The mechanical type intermittently opens and closes the valve, so that fluctuations in pressure occur, and if condensed water remains on the primary side, it may cause a water hammer that vibrates when pushed by steam. Therefore, the mechanical type is forced to be set so that water does not remain on the primary side. That is, the water hammer is prevented from being caused by intentionally causing a certain amount of steam leakage each time the opening and closing. In the mechanical type, the flow rate is fast and the valve seat has a large diameter, which causes a large steam loss. The mechanical type has a structure in which the condensate detection unit and the opening / closing unit are integrated or close to each other, so that all of the movable units are movable under a high-temperature steam atmosphere or high-temperature condensate. Originally, a lubricating aid is necessary for the movable part, but it cannot be used in a high-temperature steam atmosphere because the grease melts or evaporates. Therefore, the clearance must be increased. When the clearance is large, the steam leakage increases every time the switch is opened and closed.

  The mechanical type has a short service life and increases steam leakage if left unattended. Therefore, the steam leakage is reduced by early replacement, but the maintenance work for periodic inspection is also large.

  In the condensed water discharge device of Patent Document 1, an orifice is provided in a pipe line to discharge condensed water. The orifice type, like the nozzle type, has no moving parts, and there is no vapor leakage due to “every time of opening / closing” or “aging deterioration” like the mechanical type, but the orifice type has “aging deterioration” precisely. When the condensed water is discharged, it re-evaporates due to the differential pressure (referred to as flash evaporation). At this time, since the volume increases, for example, by 1700 times, the outlet side of the orifice hole is scraped and expanded. Leakage increases. The orifice type has no resistance due to re-evaporation under the same conditions (pressure, estimated discharge amount) as compared with the nozzle type, and therefore the orifice hole must be a very thin hole. Therefore, the discharge performance is low.

  The present applicant has proposed a condensed water discharge device (Japanese Patent Application No. 2014-011192) having a long steam generation nozzle. This is a nozzle type, and the pressure is reduced by increasing the flow rate of the condensed water inside the steam generating nozzle, and the steam is discharged. The nozzle hole is wide on the outlet side, and the finest details of the hole are on the inlet side to withstand long-term use. However, if the condensate from the steam utilization facility increases rapidly due to changes in temperature, etc., the amount of discharge cannot be increased correspondingly.

Japanese Utility Model Publication No. 6-28496

  An object of the present invention is made in view of such problems, and in a condensed water discharge device equipped with a steam generation nozzle, even if condensed water increases rapidly, condensation that can increase the discharged capacity of condensed water. It is to provide a water discharge device.

  A condensed water discharge device according to the present invention is connected to a condensed water accumulation pipe for collecting condensed water flowing in from a steam utilization facility, the condensed water accumulation pipe, and receives condensed water from an input section at a main body section, and through a filter. A steam trap that feeds into the steam generation nozzle, converts the condensed water into steam, and discharges the condensed water to the discharge pipe; a cyclone that is connected to the condensed water discharge port of the steam trap; and the condensed water storage pipe A water level sensor comprising an upper limit sensor and a lower limit sensor for detecting the level of condensed water, a discharge valve comprising an electromagnetic valve for discharging condensed water that has passed through the cyclone to the discharge pipe, and a water level of the condensed water storage pipe. When it detects that it has risen above the upper limit sensor, it opens the discharge valve, discharges the condensed water of the cyclone to the discharge pipe, and the water level of the condensed water storage pipe is the lower limit sensor. When detecting that the more decreased, the control unit closing the discharge valve, characterized in that is provided.

  It is preferable that a temperature difference power generation module is attached to the steam utilization facility, the generated electricity is stored in a battery, and the control of the control unit and the opening and closing of the discharge valve are performed with the stored electric energy.

  According to the condensate discharge device of the present invention, (1) a cyclone is connected under a steam trap equipped with a steam generation nozzle, a water level sensor is provided in the condensate accumulation pipe, and when it detects that the water level has increased, Since the condensate water of the cyclone was discharged to the discharge pipe and the water level of the condensate accumulation pipe was detected to be lowered by the lower limit sensor, the condensate drain valve was closed. It can cope with a sudden increase in condensed water. (2) Since the cyclone can separate the dust contained in the condensed water, it can discharge clean condensed water. (3) Since the condensed water is clean, the discharge valve can be prevented from being clogged. (4) The condensate accumulation tube relieves fluctuations in steam pressure on the steam utilization facility side, so that it does not cause water hammer.

  A temperature difference power generation module is installed in the steam utilization facility, and the control unit is controlled and the discharge valve is opened and closed by the electric energy stored in the battery. Can do. Since the amount of electricity is an electromagnetic valve (discharge valve) that opens from time to time, power consumption is small. Power generation is continuous temperature difference power generation, and by storing this, stable solenoid valve control can be achieved.

It is a block diagram of the condensed water discharge apparatus by this invention. It is sectional drawing which shows the inside of the steam trap of FIG. 1A is an external view and FIG. 1B is an internal configuration diagram of the temperature difference power generation module of FIG. It is explanatory drawing of the cyclone of FIG.

  Hereinafter, with reference to the drawings, a condensed water discharging apparatus according to the present invention will be described in detail.

  FIG. 1 is a configuration diagram of a condensed water discharge device 100 according to the present invention. The condensed water discharge device 100 is a device that is connected to the steam utilization facility 1 that is a main pipe for transporting the steam and removes the condensed water 7 generated inside the steam utilization facility 1. The condensed water discharge device 100 is connected to the condensed water storage pipe 3 that stores the condensed water 7 that flows in from the steam utilization facility 1 through the lead-in pipe 2 and the condensed water storage pipe 3, and converts the condensed water 7 into steam. A steam trap 8 that is discharged to the discharge pipe 4, a cyclone 9 that is connected to the steam trap 8, and a water level sensor 13 that detects the water level of the condensed water 7 in the condensed water storage pipe 3 are provided. The water level sensor 13 includes an upper limit sensor 13a and a lower limit sensor 13b. The steam or condensed water discharged to the discharge pipe 4 is sent to a boiler or the like and reused.

  The cyclone 9 is configured such that the condensed water 7 of the steam trap 8 always flows. When the discharge valve 6 (symbol “S” means a solenoid valve) of the solenoid valve is opened, the condensed water 7 is sent to the discharge pipe 4 through the cyclone 9. Since the discharge valve 6 is closed at the start of operation, the condensed water 7 tries to flow into the cyclone 9 from the steam trap 8, but the flow is limited because there is air inside. When the discharge valve 6 is opened, the condensed water 7 is sent from the cyclone 9 to the discharge pipe 4 by the pressure of the steam utilization facility 1.

  The discharge valve 6 is preferably a solenoid valve. The iron core may be driven by a solenoid and the tip portion may be an open / close valve, or the valve may be opened / closed by an angle driven by a motor. The solenoid valve has a long life because the solenoid or the motor drive part does not come into direct contact with the condensed water. There is no mechanical damage caused by the water hammer.

  The control unit 12 performs opening / closing control of the discharge valve 6 based on a signal from the water level sensor 13. Therefore, the detection signal of the water level sensor 13 is sent to the control unit 12. When the controller 12 detects that the water level of the condensed water storage pipe 3 has risen above the upper limit sensor 13a, the controller 12 opens the discharge valve 6. Then, the condensed water 7 is discharged to the discharge pipe 4 through the cyclone 9. When it is detected that the water level of the condensed water storage pipe 3 has dropped below the position of the lower limit sensor 13b, the discharge valve 6 is closed. In this way, the condensed water discharge device 100 continuously discharges the condensed water 7 with the steam generation nozzle 17, and when the condensed water 7 increases rapidly, the condensed water storage pipe indicates that the condensed water has increased. 3 is detected by a sensor, the discharge valve 6 is opened, and the condensed water 7 is discharged intermittently.

  The temperature difference power generation module 10 generates power at a temperature difference between the steam temperature of 150 to 300 ° C. and the outside air, and stores electric energy in the battery 11. The electric energy stored in the battery 11 is supplied to the control unit 12 and the discharge valve 6 of the electromagnetic valve. The power consumption of the electromagnetic valve is small and energy saving. When the temperature difference power generation module 10 cannot be prepared, a general 100V power source may be used.

  FIG. 2 is a cross-sectional view showing the inside of the steam trap 8 of FIG. The steam trap 8 includes an inlet portion 8a, a main body portion 8b, an outlet portion 8c, and a condensed water draining portion 8d. (1) The connection pipe 22 from the condensed water storage pipe 3 is attached to the inlet 8a. (2) The main body 8b is provided with a filter 15 for filtering the condensed water 7 coming out of the steam generation nozzle 17. (3) The discharge pipe 4 is connected to the outlet portion 8c. The steam 18 generated by the steam generation nozzle 17 is discharged to the discharge pipe 4. The temperature of the steam 18 is reduced to the condensed water 7 again. (4) The condensate drain 8d is provided with a filter replacement plug 16, which is removed when the filter 15 is replaced. A through hole in the center of the filter replacement plug 16 is provided, and a connecting pipe 20 for sending the condensed water 7 to the cyclone 9 is attached.

  The steam generation nozzle 17 has a length of 20 to 40 mm and has a nozzle hole formed in the center. The steam generation nozzle 17 is as long as 2 to 4 times the length of the orifice. When the condensed water 7 passes through the steam generation nozzle 17, the flow velocity is increased and the pressure is decreased to become steam. Since the condensed water 7 becomes the steam 18, the volume increases and the resistance increases. In this embodiment, the condensed water 7 is converted into steam by the steam generation nozzle 17 and the resistance of the steam is utilized, so that the diameter of the nozzle hole can be increased. Accordingly, the discharge amount of the condensed water 7 can be increased.

  The steam generation nozzle 17 has a nozzle hole diameter of 0.2 to 18 mm, and a plurality of types are prepared. The hole diameter can be made larger than that of a general orifice. For example, the steam generation nozzle 17 having a nozzle hole diameter of 18 mm can be used when the pressure of the steam utilization facility 1 is low and the generation of condensed water is large. The nozzle hole of the steam generation nozzle 17 can be a straight type or a trumpet type whose diameter increases toward the outlet side. In the trumpet type, dust or the like is difficult to accumulate inside the nozzle hole. Moreover, the exit side is not shaved by the jet. The steam generation nozzle 17 has a threaded portion on the outside, and can be replaced with another steam generation nozzle 17 by removing the nozzle replacement plug 19 as shown in FIG.

  3A and 3B are details of the temperature difference power generation module 10 of FIG. 1, in which FIG. 3A is an external view, and FIG. 3B is an internal configuration diagram. As shown in FIG. 3A, the temperature difference power generation module 10 is mounted so as to be wound around the steam utilization facility 1. As such a temperature difference power generation module 10, a flexible thermoelectric element resistant to water and water vapor is suitable. A flexible thermoelectric element has a PN pair of metal films sandwiched between sheets of a flexible resin film, and generates power using a temperature difference in the thickness direction of the sheet. As shown in FIG. 3B, the temperature difference power generation module 10 absorbs heat on the inner surface and dissipates heat from the outer surface. It is known as the Zepeck effect that a P-type semiconductor and an N-type semiconductor are connected in series to a metal material and a voltage is generated when there is a temperature difference between the metal materials. A Peltier element is a rectangular element in which a P-type semiconductor and an N-type semiconductor are arranged between upper and lower metal plates, and the upper and lower sides are covered with ceramic. Similarly, a voltage can be generated due to a temperature difference, but it is weak against water and water vapor. Since it is not flexible, when taking out the voltage from the outside of the steam pipe, the device becomes larger than the flexible thermoelectric element.

  FIG. 4 is an explanatory diagram of the cyclone 9 of FIG. The cyclone 9 is a device that cleans the condensed water. The condensed water that enters the cyclone 9 passes through the cylindrical filter 15 of the steam trap 8, but only passes through the inside of the cylinder, and foreign matter such as rust. Therefore, if it is allowed to flow through the discharge valve 6 as it is, foreign matter may be caught in the valve and cause a failure. The cyclone 9 is not clogged like a filter. Although the valve 14 provided in the lower part of the cyclone 9 can be opened and cleaned, the labor is 1/10 or less compared with the replacement of the filter. The cyclone 9 can remove foreign matters having a particle size of approximately 10 μm or more.

  As shown in FIG. 4, the condensed water 7 that has entered the cyclone 9 travels downward while turning by its own weight, and dust and the like having a high specific gravity descend along the peripheral wall portion and are collected in the dust collecting portion 21. Condensed water from which dust has been removed due to the upward flow in the center is discharged from the top, and clean condensed water is sent to the discharge valve 6. In addition, it can clean by opening the dust removal valve 14 of the bottom part of the cyclone 9 regularly. Thus, the cyclone 9 is not driven by a motor or the like and does not require a power source. Since the cyclone 9 is dust-removed by centrifugal force, it does not function unless the flow rate is high. However, the condensed water 7 passes through the cyclone 9 when the discharge valve 6 is open, but the flow rate is 20 m / s or more. That is, dust removal can function sufficiently. The size of the cyclone 9 (the ratio of each part) is not limited to this, but if the diameter of the middle cylinder is D, the diameter of the outer cylinder is about 2D, and the height of the vertical part of the outer cylinder is about 3D. The lower edge of the middle cylinder is located above the lower edge of the vertical part and below the lower edge of the inlet, the outer cylinder taper is about 5D long, and the bottom dust collecting part is about 0. It is 8D high.

  The condensed water discharge device 100 of the present embodiment continuously discharges the condensed water 7 with the steam generation nozzle 17, and when the condensed water 7 increases rapidly, the discharge valve 6 is opened to intermittently discharge the condensed water 7. Discharge. On the other hand, it is conceivable that the condensed water is discharged by intermittently opening and closing the discharge valve 6 based on the water level of the condensed water storage pipe 3 without providing the steam trap 8. In such a configuration, it is necessary to always keep the battery 11 operable.

  The present invention is a condensate drain device provided with a steam generating nozzle, and is suitable as a condensate drain device that can follow the condensate even if the condensate increases rapidly.

DESCRIPTION OF SYMBOLS 1 Steam utilization facility 2 Intake pipe 3 Condensate water storage pipe 4 Discharge pipe 6 Discharge valve 7 Condensed water 8 Steam trap 8a Inlet part 8b Main body part 8c Outlet part 8d Condensate drain part 9 Cyclone 10 Temperature difference power generation module 11 Battery 12 Control part DESCRIPTION OF SYMBOLS 13 Water level sensor 13a Upper limit sensor 13b Lower limit sensor 14 Dust removal valve 15 Filter 16 Filter replacement plug 17 Steam generation nozzle 18 Steam 19 Nozzle replacement plug 20 Connection pipe 21 Dust collection part 22 Connection pipe 100 Condensate drainage device

Claims (2)

A condensate storage pipe for storing condensate flowing in from the steam utilization facility;
Steam that is connected to the condensed water accumulation pipe, receives condensed water from the input section at the main body section, sends it to the steam generation nozzle through a filter, converts the condensed water into steam, and discharges it from the outlet section to the discharge pipe Trap and
A cyclone connected to the condensate drain of the steam trap;
A water level sensor comprising an upper limit sensor and a lower limit sensor provided in the condensate water storage pipe for detecting the water level of the condensed water;
A discharge valve comprising a solenoid valve for discharging condensed water that has passed through the cyclone to the discharge pipe;
When detecting that the water level of the condensed water storage pipe has risen above the upper limit sensor, the discharge valve is opened, condensed water is discharged to the discharge pipe through the cyclone, and the water level of the condensed water storage pipe is reduced by the lower limit sensor. And a controller that closes the discharge valve when it is detected that the drop has occurred.
The temperature difference power generation module is attached to the steam utilization facility, the generated electricity is accumulated in a battery, and the control of the control unit and the opening and closing of the discharge valve are performed with the accumulated electric energy. Condensate drainage device as described in 1.

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