JP2006194530A - Steam temperature decreasing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steam temperature decreasing device capable of saving energy by reducing heat energy discharged to the outside of a system. <P>SOLUTION: A mixing portion 7 and a gas-liquid separating portion 4 are connected with a steam pipe 1. A cooling fluid supply pipe 2 is connected with an upper part of the mixing portion 7. The steam pipe 1 is branched and branched steam pipes 3 are connected. A steam ejector 6 is mounted on the branched pipe 3. A communication pipe 12 is connected with a suction chamber 11 of the steam ejector 6. The communication pipe 12 is connected with a liquid discharge portion 5 through a tank 13 and a liquid discharge pipe 18. The liquid of high temperature discharged from the liquid discharge portion 5 partially becomes re-evaporated steam and sucked to the suction chamber 11 of the steam ejector 6, thus the loss of heat energy can be reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a steam temperature reducing device that reduces a temperature of a high-temperature steam such as superheated steam to a predetermined low temperature such as a saturated steam temperature.

  In the steam temperature reducing device, an ejector and a brackish water separator are arranged downstream of the ejector in the pipe of the steam pipe, a drain valve is arranged at the water outlet of the brackish water separator, and cooling water is supplied to the ejector unit. By supplying, the temperature of the high-temperature steam flowing down in the steam line is reduced, and excess cooling water separated from the steam by the brackish water separator is discharged from the drain valve to the outside of the system.

In this steam temperature reducing device, excessive cooling water separated from the steam by the brackish water separator is discharged from the drain valve to the outside of the system, so that there is a problem that heat energy loss becomes large. The cooling water discharged from the drain valve is high-temperature water that has been heated in contact with high-temperature steam and has a relatively large amount of heat energy, so discharging it outside the system is a loss of heat energy. It becomes.
JP 2000-146111 A

  The problem to be solved is to provide a steam temperature reducing device that can save energy by reducing the thermal energy discharged outside the system.

  The present invention supplies a cooling fluid to the steam flowing down the steam pipe to reduce the temperature of the steam to a predetermined value. The gas-liquid separation unit and the liquid discharge unit are disposed downstream of the mixing unit of the steam and the cooling fluid. In addition, a steam ejector is attached to a branch steam pipe branched from the steam pipe, and the suction chamber of the steam ejector is connected to the liquid discharge portion.

  In the steam temperature reducing device of the present invention, a steam ejector is attached to a branch steam pipe branched from the steam pipe, and the suction chamber of the steam ejector is connected to the liquid discharge section, so that the high-temperature liquid discharged from the liquid discharge section can be obtained. The heat energy is sucked into the suction chamber of the steam ejector, and is supplied again to the steam use location etc. together with the steam whose temperature has been reduced, so that the loss of heat energy can be suppressed to save energy.

  In the present invention, a gas-liquid separation part and a liquid discharge part are attached to the downstream side of the mixing part of the steam and the cooling fluid, and the gas-liquid separation part and the liquid discharge part may be arranged integrally or separately. it can.

  In FIG. 1, a steam temperature reducing device includes a steam pipe 1 through which high-temperature steam flows, a cooling fluid supply pipe 2, a branch steam pipe 3 to which a steam ejector 6 is attached, a gas-liquid separation unit 4, and a liquid discharge unit 5. Constitute.

  The left end side of the steam pipe 1 is connected to a high-temperature superheated steam source (not shown), and is connected to a mixing unit 7 for mixing steam and cooling fluid via a control valve 8 for controlling the amount of steam supplied. The cooling fluid supply pipe 2 is connected to the upper part on the inlet side of the mixing unit 7 through the control valve 9. In the mixing unit 7, high-temperature superheated steam and, for example, cooling water as a cooling fluid are mixed, and the temperature of the superheated steam can be reduced to a predetermined value.

  The steam pipe 1 is branched and the branch steam pipe 3 is connected. A control valve 10 and a steam ejector 6 are attached to the branch steam pipe 3. The suction pipe 11 of the steam ejector 6 is connected to a communication pipe 12 that communicates with the liquid discharge part 5 via a tank 13. The outlet side of the steam ejector 6 is connected to the steam pipe 1 on the inlet side of the mixing unit 7 by an outlet pipe 14. The gas-liquid separation unit 4 is disposed on the downstream side of the mixing unit 7.

  The gas-liquid separation unit 4 separates the steam and the cooling water by centrifugal force, and connects the inlet 15 to the steam supply pipe 1 and connects the outlet 16 to the steam supply pipe 17 communicating with the steam use location. .

  A liquid discharge part 5 is formed integrally with the lower part of the gas-liquid separation part 4. A liquid discharge pipe 18 is connected to the lower end of the liquid discharge unit 5 to communicate with the tank 13. The liquid discharge unit 5 is a stainless steel spherical float arranged in a free state, and when a predetermined amount of high-temperature cooling water separated from the vapor in the gas-liquid separation unit 4 accumulates inside, the spherical float floats by buoyancy. By opening the valve opening, only the liquid can be discharged to the liquid discharge pipe 18 side.

  A vapor trap 20 is attached to the tank 13 by connecting a liquid external discharge pipe 19 to a predetermined height. Inside the tank 13, high-temperature cooling water supplied from the liquid discharge pipe 18 is accumulated, and a part of this high-temperature cooling water is filled with re-evaporated vapor. When the liquid level in the tank 13 reaches the liquid external discharge pipe 19, the cooling liquid is automatically removed from the vapor trap 20 to the outside.

  The re-evaporated steam generated in the tank 13 is sucked into the suction chamber 11 of the steam ejector 6 through the control valve 21 and the communication pipe 12, and mixed with the high-temperature steam supplied from the branch steam pipe 3. Supplied to.

  By mixing the high-temperature superheated steam supplied from the steam pipe 1, the cooling water supplied from the cooling fluid supply pipe 2, and the re-evaporated steam supplied from the outlet pipe 14 in the mixing unit 7, The hot superheated steam is reduced to a predetermined temperature. In the gas-liquid separation unit 4, an excess of the cooling water heated by the mixing unit 7 is separated and flows down from the liquid discharge unit 5 into the tank 13 and accumulates. The re-evaporated steam re-evaporated from the high-temperature cooling water in the tank 13 is sucked into the suction chamber 11 of the steam ejector 6. In this way, by re-evaporating the re-evaporated steam of the high-temperature cooling water with the steam ejector 6, it is possible to save energy by reducing the loss of heat energy of the high-temperature cooling water that has been conventionally discarded.

  Since only the re-evaporated steam is sucked into the steam ejector 6 and high-temperature water is not sucked, the suction efficiency of the steam ejector 6 can be kept high.

The block diagram which shows the Example of the steam temperature decreasing apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steam pipe 2 Cooling fluid supply pipe 3 Branch steam pipe 4 Gas-liquid separation part 5 Liquid discharge part 6 Steam ejector 7 Mixing part 11 Suction chamber 12 Communication pipe 13 Tank 18 Liquid discharge pipe 20 Steam trap

Claims (1)

Supplying a cooling fluid to the steam flowing down the steam pipe to reduce the temperature of the steam to a predetermined value, a gas-liquid separation unit and a liquid discharge unit are provided on the downstream side of the mixing unit of the steam and the cooling fluid, and A steam temperature reducing device, wherein a steam ejector is attached to a branch steam pipe branched from a steam pipe, and a suction chamber of the steam ejector and a liquid discharge portion are connected.

Images