JP5367384B2 - Condensate recovery device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a condensate returning device for surely returning condensate to an economizer and a boiler even when a temperature of the condensate is high. <P>SOLUTION: A condensate supply pipe 1 is connected to a condensate storage container 2. A condensate return pump 4 is connected to a lower part of the condensate storage container 2. The condensate return pump 4 is composed of an ejector 10 and a circulation pump 11. A part of a circulation pathway 12 of the condensate return pump 4 is branched and connected to a condensate return pipe 13. The condensate return pipe 13 is connected to the economizer 14. The condensate of high temperature in the condensate storage container 2 is sucked to the ejector 10 of the condensate return pump 4, so that a part of the condensate of high temperature is supplied to the economizer 14 from the condensate return pipe 13, and exchanges heat with a combustion gas of high temperature generated in a steam boiler 15. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

 The present invention relates to a condensate recovery apparatus that recovers condensate as condensate of steam generated in a steam-using device to a condensate recovery destination such as a boiler.

 The conventional condensate recovery device is capable of recovering the condensate at a predetermined temperature flowing from the drain (condensate) recovery device 14 into the feed water tank 2 to the boiler 1 by the feed water pump 7 via the economizer 9. It is.

The conventional condensate recovery apparatus has a problem that high-temperature condensate at a predetermined temperature or higher, for example, 80 ° C. or higher cannot be recovered by the feed pump 7. This is because when a high-temperature condensate of about 80 ° C. or more flows in a normal water supply pump, a part of the high-temperature condensate is re-evaporated into steam and is crushed and crushed. This is because vibration is generated and the water supply pump is damaged in a remarkable case.

JP 2000-121033 A

  The problem to be solved is to obtain a condensate recovery device that can reliably recover condensate to a economizer and boiler even when the temperature of the condensate is high.

The present invention recovers condensate generated by condensing steam in a steam-using device to a boiler via a conserving unit by means of a condensate recovery pump, and a condensate reservoir connected to a condensate supply pipe is disposed. Then, a re-evaporation vapor discharge pipe is attached to the condensate reservoir and connected to the mixing tank, a cooling water supply pipe is connected to the mixing tank and cooling water is stored inside, and the re-evaporation vapor discharge pipe is A re-evaporated vapor injection nozzle is attached to the lower end portion and extends into the cooling water, and each of the mixing tank and the condensate reservoir is connected to a condensate recovery pump by a pipe line. It is formed by an ejector and a circulation pump.

  The present invention is a high-temperature condensate because the condensate recovery pump is formed of an ejector and a circulation pump, so that the high-temperature condensate does not re-evaporate and vigorous vibrations are not generated. However, there is an advantage that it can be reliably recovered to a economizer and a boiler.

It is a block diagram which shows the Example of the condensate collection | recovery apparatus which concerns on this invention.

  In the present invention, the condensate recovery pump is formed by an ejector and a circulation pump, but the combination of the ejector and the circulation pump is not limited to one, depending on the amount and temperature of the generated condensate, and a plurality of the condensate recovery pumps. They can be used in series or in parallel.

  In FIG. 1, the condensate supply pipe 1, the condensate reservoir 2, and the condensate recovery pump 4 constitute a condensate recovery device.

The condensate supply pipe 1 has a right end connected to a high-temperature condensate generation source such as a steam using device (not shown) and the other end connected to the upper part of the condensate reservoir 2.

The condensate reservoir 2 is a vertically long cylindrical tank. A part of the high-temperature condensate that has flowed in is re-evaporated and collected upward, and condensate is accumulated below. A re-evaporated steam discharge pipe 8 is attached to the upper surface of the condensate reservoir 2 and connected to the lower mixing tank 3. A cooling water supply pipe 5 is connected to the mixing tank 3 to store cooling water 6 therein. A re-evaporated steam injection nozzle 7 is attached to the lower end of the re-evaporated steam discharge pipe 8 and extends into the cooling water 6.

The lower part of the mixing tank 3 and the lower end of the condensate reservoir 2 are connected to the condensate recovery pump 4 by a conduit 9.

The condensate recovery pump 4 is formed by connecting an ejector 10 and a circulation pump 11 with a circulation path 12, and a part of the circulation path 12 is branched to connect a condensate recovery pipe 13. By driving the circulation pump 11, suction force is generated in the ejector 10, and the high-temperature condensate in the condensate reservoir 2 and the mixed liquid of re-evaporated steam and cooling water in the mixing tank 3 are sucked. Is.

The upper end of the condensate recovery pipe 13 is connected to the economizer 14. A condensate recovery pipe 13 is arranged in a coil shape inside the economizer 14, and a lower end portion of the condensate recovery pipe 13 is connected to a water supply port 16 of the steam boiler 15. In the economizer 14, the combustion gas generated in the steam boiler 15 and the liquid in the condensate recovery pipe 13 are heat-exchanged, and the liquid whose temperature has increased is supplied to the boiler 15 as supply water. The high-temperature steam generated in the steam boiler 15 is supplied from an upper steam header pipe 17 and a steam supply pipe 18 to a steam using device (not shown).

Between the mixing tank 3 and the ejector 10, a check valve 19 capable of passing a fluid in only one direction is attached. The check valve 19 allows the fluid to pass only from the mixing tank 3 to the ejector 10 side, and automatically blocks the passage of the fluid in the opposite direction. By attaching the check valve 19, the ejector 10 preferentially sucks the high-temperature condensate accumulated in the condensate reservoir 2.

The high temperature condensate in the condensate reservoir 2 is sucked into the condensate recovery pump 4 composed of the ejector 10 and the circulation pump 11, so that the pump 4 does not generate a violent vibration such as a burr. And recovered into the steam boiler 15.

  It can be applied as a condensate recovery device when the temperature of the condensate generated is relatively high.

DESCRIPTION OF SYMBOLS 1 Condensate supply pipe 2 Condensate reservoir 3 Mixing tank 4 Condensate recovery pump 5 Cooling water supply pipe 10 Ejector 11 Circulation pump 12 Circulation path 13 Condensate recovery pipe 14 Conservator 15 Steam boiler

Claims (1)

Condensate generated by condensing steam in equipment using steam is recovered to the boiler via a conserving unit using a condensate recovery pump, and a condensate reservoir connected to the condensate supply pipe is placed, A re-evaporation vapor discharge pipe is attached to the condensate reservoir and connected to the mixing tank, and a cooling water supply pipe is connected to the mixing tank to store cooling water therein, and the re-evaporation vapor discharge pipe is re-applied to the lower end of the re-evaporation vapor discharge pipe. An evaporating vapor injection nozzle is attached and extended into the cooling water, and each of the mixing tank and the condensate reservoir is connected to a condensate recovery pump by a conduit, and the condensate recovery pump is connected to an ejector and a circulation pump. A condensate recovery device characterized by being formed in