JP2007051802A - Steam temperature reducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steam temperature reducing device causing no temperature unevenness in temperature-reduced steam by mixing high temperature steam and a cooling fluid wholly and uniformly. <P>SOLUTION: A cooling fluid supply part 2 and a heat exchange part 3 are sequentially connected to a high temperature steam supply pipe 1. A cooling fluid pipe 6 is connected to the cooling fluid supply part 2. An internal passage 7 of the heat exchange part 3 is connected to the cooling fluid supply part 2 and a temperature-reduced steam supply pipe 9, respectively. A spiral outer peripheral passage 10 is disposed at the outer periphery of the internal passage 7. The outer peripheral passage 10 is in communication with a cooling fluid tank 4 and a circulating pump 11. The high temperature steam supplied from the high temperature steam supply pipe 1 is mixed with the cooling fluid raised in temperature in the cooling fluid supply part 2, and reduced to a predetermined temperature without temperature unevenness. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a steam temperature reducing apparatus capable of reducing the temperature of steam in a high temperature state to a predetermined temperature, for example, a saturated steam temperature.

  The steam temperature reducing device supplies a cooling fluid such as cooling water to overheated high temperature steam to reduce the temperature of the steam to a predetermined temperature.

In this steam temperature reducing device, since the drain on the secondary side of the heating container, that is, the liquid, is used as a cooling fluid and brought into contact with high-temperature steam to reduce the temperature of the steam, the entire steam is not uniformly cooled. There is a problem that temperature unevenness occurs in the reduced temperature steam. That is, even if the cooling water is supplied to the high-temperature steam through a nozzle or the like, the steam and water droplets are not mixed uniformly and entirely, resulting in temperature unevenness.
Japanese Patent Publication No. 7-88933

  The problem to be solved is to provide a steam temperature reducing device in which the high temperature steam and the cooling fluid are uniformly and uniformly mixed so as not to cause temperature unevenness in the temperature reduced steam.

  The present invention supplies a cooling fluid into high-temperature steam and reduces the temperature of the high-temperature steam to a steam in a predetermined temperature state. A cooling fluid supply unit that supplies the cooling fluid heat-exchanged in the unit to the high-temperature steam is provided, and the cooling fluid supply unit is disposed on the inlet side of the heat exchange unit.

  The steam temperature reducing apparatus of the present invention supplies the cooling fluid whose temperature has been increased by heat exchange between the steam and the cooling fluid in the heat exchange section, that is, the steam to be cooled from the cooling fluid supply section. As a result, the cooling water whose temperature has risen is quickly evaporated and mixed in the steam and mixed with the steam, so that the mixing of the high temperature steam and the cooling fluid is promoted, and the temperature of the high temperature steam can be reduced without temperature unevenness.

  In the present invention, the cooling fluid supplied from the cooling fluid supply unit to the steam to be reduced in temperature is heated in advance in the heat exchange unit to a predetermined temperature and then the temperature is increased, and then supplied to the steam to be reduced in temperature. The heat exchange between the cooling fluid and the steam in the heat exchange section is preferably such that the steam and the cooling fluid indirectly exchange heat.

  FIG. 1 is a configuration diagram of an embodiment of the present invention, in which a high-temperature steam supply pipe 1 through which a superheated high-temperature steam flows, a cooling fluid supply unit 2, a heat exchange unit 3, and a cooling fluid tank 4 are shown. And constitute a steam temperature reducing device.

  The cooling fluid supply unit 2 includes an inverted T-shaped cooling fluid supply line 5, the inlet side of the cooling fluid supply line 5 is connected to the high temperature steam supply pipe 1, and the heat exchange unit 3 is connected to the outlet side. At the same time, a cooling fluid pipe 6 communicating with the cooling fluid tank 4 is connected to the upper end of the cooling fluid supply pipe 5. Although not shown, a spray nozzle for spraying the cooling fluid is attached while the cooling fluid pipe 6 communicates with the cooling fluid supply pipe 5.

  The heat exchanging unit 3 has a double pipe structure, and the steam mixed with the cooling fluid passes through the internal passage 7 in the cooling fluid supply unit 2, passes through the gas-liquid separator 8 and the temperature-reducing steam supply tube 9, Steam reduced to a predetermined temperature is supplied to the steam use location.

  The outer peripheral passage 10 of the heat exchanging unit 3 is a continuous spiral passage, and the cooling fluid in the cooling fluid tank 4 passes through the circulation pump 11 and the passage 12 while flowing down the spiral outer peripheral passage 10. The temperature rises to a predetermined temperature through heat exchange. The cooling fluid whose temperature has increased reaches the cooling fluid tank 4 through the outlet pipe 13. The cooling fluid in the cooling fluid tank 4 is supplied to the cooling fluid supply unit 2 by branching the discharge passage of the circulation pump 11 and connecting the cooling fluid pipe 6.

  A cooling fluid supply pipe 15 for supplying cooling fluid is connected to the upper surface of the cooling fluid tank 4. A cooling fluid discharge pipe 16 that discharges the remaining cooling fluid is connected to the lower side surface of the cooling fluid tank 4.

A gas-liquid separator 8 that separates the droplets in the steam from the steam is attached to the temperature-reduced steam supply pipe 9 on the outlet side of the heat exchange unit 3. Only the vapor from which the droplets have been separated flows down to the temperature-reduced steam supply pipe 9 on the outlet side of the gas-liquid separator 8. On the other hand, the liquid separated from the vapor by the gas-liquid separator 8 reaches the cooling fluid tank 4 through the discharge pipe 17. The temperature-reducing steam supply pipe 9 is provided with a temperature sensor 18 for detecting the temperature of the temperature-reducing steam flowing down.

  The high temperature steam that flows down from the left side to the right side through the high temperature steam supply pipe 1 is mixed with the cooling fluid supplied from the cooling fluid supply unit 2 and reduced in temperature to a predetermined temperature. Note that the amount of the cooling fluid supplied through the cooling fluid supply pipe 5 can be appropriately controlled by adjusting the valve opening degree of the valve 20.

The temperature of the cooling fluid supplied through the cooling fluid supply pipe 5 is raised by the steam flowing down the internal passage 7 of the heat exchange unit 3. Accordingly, the cooling fluid supplied from the cooling fluid supply line 5 into the superheated steam through the cooling fluid tank 4, the circulation pump 11, and the cooling fluid pipe 6 is immediately evaporated and spread over the whole superheated steam. Can be reduced to a predetermined temperature without temperature unevenness.

Condensate as condensed water generated as a result of heating and cooling the cooling fluid in the heat exchanging unit 3 and the remaining droplets of the cooling fluid supplied in the cooling fluid supply unit 2 are separated into the gas-liquid separator 8. Is separated from the steam and reaches the cooling fluid tank 4 from the discharge pipe 17. The vapor from which the liquid has been separated and the temperature has been reduced to a predetermined temperature is supplied from the temperature-reduced vapor supply pipe 9 to a vapor use location (not shown).

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

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High temperature steam supply pipe 2 Cooling fluid supply part 3 Heat exchange part 4 Cooling fluid tank 5 Cooling fluid supply pipe 6 Cooling fluid pipe 7 Internal passage 8 Gas-liquid separator 9 Temperature-reducing steam supply pipe 10 Outer peripheral passage 11 Circulation pump 12 Passage 18 Temperature sensor

Claims (1)

A cooling fluid is supplied into the high-temperature steam to reduce the temperature of the high-temperature steam to a predetermined temperature state, and a heat exchange section is provided for heat exchange between the steam and the cooling fluid, and heat exchange is performed at the heat exchange section. And a cooling fluid supply section for supplying the cooled cooling fluid into the high-temperature steam, and the cooling fluid supply section is arranged on the inlet side of the heat exchange section.

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