JP2007247973A - Condensate recovery device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a condensate recovery device capable of effectively using re-evaporated steam by raising the pressure of the re-evaporated steam discharged from a discharge pipe to a predetermined value. <P>SOLUTION: A condensate supply pipe 1 is connected to a condensate storing container 2. A steam trap 5 is interposed in the condensate supply pipe 1. A steam compressor 3 is connected to an upper part of the condensate storing container 2 via the discharge pipe 8. A condensate recovery pump 4 is connected to a lower part of the condensate storing container 2. In the condensate recovery pump 4, a circulation pump 6 is connected to an ejector 7 with a circulation passage 10, and further, a condensate recovering pipe 11 is connected thereto. A part of the high temperature condensate supplied to the condensate storing container 2 from the condensate supply pipe 1 is re-evaporated, sucked by the steam compressor 3, and the pressure thereof is raised to a predetermine value, is then supplied to a separate steam-using location. <P>COPYRIGHT: (C)2007,JPO&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.

 A conventional condensate recovery device is composed of a steam trap and a condensate inflow pipe provided on the secondary side or outlet side of the steam-using equipment, a control valve attached to the pressure relief pipe, and a condensate pump attached to the condensate outflow pipe. The control valve attached to the pressure relief pipe is configured to discharge part of the re-evaporated steam of the condensate discharged from the steam trap to the outside of the system. The water pump can recover the high-temperature condensate to a predetermined location.

The conventional condensate recovery apparatus has a problem that the re-vaporized steam discharged from the pressure relief pipe and the control valve cannot be effectively used. This is because the re-evaporated steam discharged from the pressure relief pipe and the control valve has a relatively low pressure, so that there is practically no place where it can be used.
Japanese Patent Publication No. 60-42846

  The problem to be solved is to obtain a condensate recovery device capable of effectively using re-evaporated steam by increasing the pressure of re-evaporated steam discharged from the pressure relief pipe to a predetermined value.

  The present invention recovers condensate generated in steam-using equipment to a condensate recovery destination such as a boiler or a water supply tank by a condensate recovery pump, and re-evaporated steam from which part of the condensate has re-evaporated from the discharge pipe In the case of discharging outside, a steam compressor is connected to the discharge pipe.

  In the present invention, by connecting a steam compressor to the discharge pipe, that is, the pressure release pipe, the pressure of the re-evaporated steam discharged from the discharge pipe can be increased to an arbitrary pressure, and effective use of the re-evaporated steam can be achieved. it can.

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

  In FIG. 1, a condensate recovery apparatus is constituted by a condensate supply pipe 1, a condensate reservoir 2, a steam compressor 3, and a condensate recovery pump 4.

The condensate supply pipe 1 has a left end connected to a high-temperature condensate generation source such as a steam using device (not shown), and a right end connected to the condensate reservoir 2 via a steam trap 5. The steam trap 5 is a kind of automatic valve that causes only the condensate to flow into the condensate reservoir 2 from the mixed fluid of steam and steam flowing down in the condensate supply pipe 1.

The condensate reservoir 2 is a vertically long cylindrical tank, and a part of the condensate that has flowed in re-evaporates and accumulates upward, and condensate accumulates below. A steam compressor 3 is connected to the upper part of the condensate reservoir 2 by a discharge 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.

By driving the steam compressor 3, the inside of the condensate reservoir 2 is brought into a predetermined depressurized state, and a part of the high-temperature condensate supplied from the steam trap 5 is re-evaporated and sucked into the steam compressor 3, compressed, and compressed. It becomes a medium pressure state and is supplied from the supply pipe 9 to a separate medium pressure steam use location. The pressure of the steam supplied from the steam compressor 3 can be arbitrarily controlled by controlling the rotational speed of the screw type rotor of the steam compressor 3. In this way, by increasing the pressure of the steam supplied from the supply pipe 9 to an arbitrary value by the steam compressor 3, the actual use location of the steam is increased and effective utilization can be achieved.

The condensate recovery pump 4 has a circulation pump 6 and an ejector 7 connected by a circulation path 10, and a part of the circulation path 10 is branched to connect a condensate recovery pipe 11. A primary pressure regulating valve 12 is interposed in the condensate recovery pipe 11 so that the right end communicates with a condensate recovery destination such as a boiler or a water supply tank (not shown).

By driving the circulation pump 6 and circulating a predetermined amount of condensate in the circulation path 10, the condensate in the condensate reservoir 2 is sucked by the ejector 7 and recovered from the condensate recovery pipe 11. To do.

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

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Condensate supply pipe 2 Condensate reservoir 3 Steam compressor 4 Condensate recovery pump 5 Steam trap 6 Circulation pump 7 Ejector 8 Drain pipe 9 Supply pipe 10 Circulation path 11 Condensate recovery pipe 12 Primary pressure adjustment valve

Claims (1)

Condensate generated from steam-using equipment is recovered by a condensate recovery pump to a condensate recovery destination such as a boiler or a water supply tank, and re-evaporated steam partially evaporated from the condensate is discharged from the discharge pipe to the outside of the system. A condensate recovery device characterized in that a steam compressor is connected to the discharge pipe.

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