JP2007247971A - Wastewater treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wastewater treatment apparatus capable of cooling condensate water to low temperatures. <P>SOLUTION: A high temperature condensate water supply pipe 2 is connected to the upper surface of a re-evaporation tank 1. A steam compressor 3 is connected to an upper part of the re-evaporation tank 1. A liquid force-feeding member 4 is connected to a lower part of the re-evaporation tank 1. The liquid force-feeding member 4 is provided with each one of a liquid inflow port 15, a liquid outflow port 16, a high pressure operation fluid introduction port 17, and a high pressure operation fluid discharge port 18, and thereby, condensate water can be forcedly fed to a predetermined location from the liquid outflow port 16. A part of the high temperature condensate water supplied to the re-evaporation tank 1 from the high temperature condensate water supply pipe 2 is re-evaporated and sucked into the steam compressor 3. The cooled condensate water is discharged from the liquid force-feeding member 4 disposed at the lower part of the re-evaporation tank 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

 The present invention relates to a wastewater treatment apparatus that cools a high-temperature condensate condensed with steam to a predetermined temperature and then discharges it outside the system.

 The conventional wastewater treatment equipment is a condensate supply pipe connected to a re-evaporation tank, and a steam ejector and a liquid pumping member are connected to this re-evaporation tank. Re-evaporated vapor in the re-evaporation tank is sucked by the steam ejector. By doing so, the high-temperature condensate condensed with steam can be cooled to a predetermined temperature and discharged out of the system.

The conventional wastewater treatment apparatus has a problem in that the temperature range of the high-temperature condensate that can be cooled is limited, and can only be cooled to a predetermined temperature, and cannot be cooled to a lower temperature.
JP 2004-278871 A

  The problem to be solved is to obtain a wastewater treatment device that can cool the condensate to a lower temperature by expanding the temperature range of the high-temperature condensate that can be cooled in the reevaporation tank.

  In the present invention, a condensate supply pipe is connected to a re-evaporation tank and the vapor re-evaporated from the condensate in the re-evaporation tank is sucked, and a steam compressor and a liquid pumping member are connected to the re-evaporation tank. Is.

  By connecting a steam compressor to the re-evaporation tank, the present invention arbitrarily controls the amount of re-evaporation of condensate in the re-evaporation tank by maintaining the inside of the re-evaporation tank at an arbitrary low pressure, that is, a vacuum pressure. Thus, the temperature range of the high-temperature condensate that can be cooled in the reevaporation tank can be expanded, and the condensate can be cooled to a lower temperature.

  In the present invention, a steam compressor is connected to the re-evaporation tank. As the steam compressor, a so-called oil-free screw-type steam compressor is suitable.

  In FIG. 1, a effluent treatment device is constituted by a reevaporation tank 1, a high-temperature condensate supply pipe 2 that supplies high-temperature condensate to the reevaporation tank 1, a steam compressor 3, and a liquid pumping member 4.

The reevaporation tank 1 has a cylindrical sealed shape, and a condensate supply pipe 2 is connected to the upper surface, and an overflow pipe 5 is connected to the upper part of the side surface. The condensate supply pipe 2 is connected to a high-temperature condensate generation source such as a steam using device (not shown) through a valve 6. A valve 7 is also interposed in the overflow pipe 5.

A steam compressor 3 is connected to the upper part of the re-evaporation tank 1 by a connecting pipe 8. The steam compressor 3 is an oil-free screw-type steam compressor 3, and the suction, compression, and exhaust processes are continuously repeated as a pair of male and female screw type rotors (not shown) rotate.

When the steam compressor 3 is driven, the inside of the re-evaporation tank 1 is in a predetermined depressurized state, and a part of the high-temperature condensate supplied from the condensate supply pipe 2 is re-evaporated and sucked into the steam compressor 3, compressed, and compressed The medium pressure state is supplied from the discharge pipe 9 to a separate medium pressure steam use location. In this way, the high-temperature condensate is re-evaporated in the re-evaporation tank 1, whereby the high-temperature condensate is cooled to a predetermined low temperature.

The liquid pumping member 4 has a liquid inlet 15 and a liquid outlet 16, a high-pressure operating fluid inlet 17 and a high-pressure operating fluid outlet 18, and the liquid inlet 15 is connected to the bottom of the reevaporation tank 1 by a pipe 10. Connect with. A check valve 11 that allows only passage of fluid in one direction is attached to the pipe line 10. The check valve 11 allows passage of fluid from the re-evaporation tank 1 to the liquid pumping member 4 and prevents passage in the opposite direction.

A condensate discharge pipe 20 is connected to the liquid outlet 16 of the liquid pumping member 4 via a check valve 19, and a high-pressure steam pipe 21 is connected to the high-pressure operation fluid inlet 17. On the other hand, the high-pressure operating fluid discharge port 18 communicates with the upper part of the re-evaporation tank 1 through the pressure equalizing pipe 22.

The liquid pumping member 4 is arranged below the reevaporation tank 1 by a predetermined distance. Further, the liquid pumping member 4 closes the high-pressure operating fluid introduction port 17 and opens the high-pressure operating fluid discharge port 18 when a float (not shown) disposed therein is located in the lower portion, and re-evaporation tank The condensate having been cooled from 1 to a predetermined temperature is caused to flow down into the liquid pumping member 4 through the check valve 11 and the liquid inlet 15. When condensate accumulates in the liquid pumping member 4 and a float (not shown) is located at a predetermined upper portion, the high-pressure operation fluid discharge port 18 is closed, while the high-pressure operation fluid introduction port 17 is opened, and the high-pressure steam pipe The steam for high-pressure pumping is caused to flow from 21 to the inside, so that the condensate accumulated inside is pumped to a predetermined location through the liquid outlet 16, the check valve 19 and the condensate discharge pipe 20.

  When the condensate is pumped by high-pressure steam and the liquid level in the liquid pumping member 4 is lowered, the high-pressure operating fluid inlet 17 is closed again and the high-pressure operating fluid outlet 18 is opened, so that the liquid inlet 15 Allow the condensate to flow down. By repeating such an operation cycle, the liquid pumping member 4 pumps the condensate from the reevaporation tank 1 to a predetermined location.

The block diagram which shows the Example of the waste water treatment equipment which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Re-evaporation tank 2 High temperature condensate supply pipe 3 Steam compressor 4 Liquid pumping member 8 Connection pipe 10 Pipe 11 Check valve 15 Liquid inlet 16 Liquid outlet 17 High pressure operation fluid inlet 18 High pressure operation fluid outlet 20 Recovery Water discharge pipe 21 High-pressure steam pipe 22 Pressure equalizing pipe

Claims (1)

A condensate supply pipe is connected to the re-evaporation tank, and the vapor re-evaporated from the condensate in the re-evaporation tank is sucked, and a steam compressor and a liquid pumping member are connected to the re-evaporation tank, respectively. Wastewater treatment equipment.

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