JP4949770B2 - Condensate recovery device - Google Patents

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 steam loss, that is, heat energy loss occurs, because part of the reevaporated steam is discharged out of the system from the pressure relief pipe and the control valve.
Japanese Patent Publication No. 60-42846

  The problem to be solved is to obtain a condensate recovery apparatus that does not cause steam loss, that is, thermal energy loss.

The present invention recovers condensate generated in steam-using equipment to a condensate recovery destination such as a boiler or a water supply tank using a condensate recovery pump, and sucks re-evaporated steam from which part of the condensate has re-evaporated. In addition to arranging the ejector, the suction part of each steam ejector is connected to the high-pressure condensate reservoir and the low-pressure condensate reservoir, and the condensate is recovered to the condensate collection destination below the high-pressure condensate reservoir. Connected to the condensate recovery pump, connected to the condensate pumping member below the low pressure condensate reservoir, and connected the condensate outlet of the condensate pumping member to the inlet of the high pressure condensate pipe of the high pressure condensate reservoir. Thus, the condensate of the condensate pumping member is supplied to the high-pressure condensate reservoir .

  The present invention provides a steam ejector that sucks the re-evaporated vapor in which a part of the condensate has re-evaporated, so that the re-evaporated vapor is sucked by the steam ejector and supplied to a predetermined steam utilization location. There is no loss or thermal energy loss.

  Although the present invention uses a steam ejector, the steam ejector uses steam at a predetermined pressure as a driving fluid. When a small amount of re-evaporated steam is sucked, a steam having a relatively low pressure is used as a driving fluid. On the other hand, when a large amount of re-evaporated vapor is sucked, high-pressure vapor can be used as the driving fluid.

  In FIG. 1, two steam ejectors 2 and 3 connected to a steam supply pipe 1, a condensate recovery pump 4, and a condensate pumping member 5 constitute a condensate recovery device.

The right side portion of the steam supply pipe 1 is connected to a boiler (not shown) as a steam supply source to connect the steam ejector 2 and the second steam exhaust sector 3 is connected to the branch pipe 6 branched in the middle. The outlet sides of the respective steam ejectors 2 and 3 are further combined into a single steam supply pipe 13 and connected to a steam utilization location (not shown). Further, pressure adjusting valves 7 and 8 for adjusting the supplied steam pressure are attached to the inlet side of the steam ejectors 2 and 3.

The suction portions of the respective steam ejectors 2 and 3 are connected to the high-pressure condensate reservoir 11 and the low-pressure condensate reservoir 12 by pipe lines 9 and 10. The high-pressure condensate reservoir 11 is a sealed container that temporarily stores the high-pressure and high-temperature condensate flowing down from the high-pressure condensate pipe 14, and the high-temperature condensate is re-evaporated into steam again in this container. Via the suction part of the steam ejector 2. Similarly, a low-pressure condensate pipe 15 is connected to the low-pressure condensate reservoir 12, and re-evaporated vapor of low-temperature condensate is generated in the container 12 and sucked into the suction part of the steam ejector 3.

A condensate recovery pump 4 is connected to the lower side of the high-pressure condensate reservoir 11 via a pipe line 16. The condensate recovery pump 4 has a circulation pump 17 and an ejector 18 connected by a circulation path 19, and a part of the circulation path 19 is branched to connect a condensate recovery pipe 20. A primary pressure regulating valve 21 is interposed in the condensate recovery pipe 20 so that the upper right end communicates with a condensate recovery destination such as a boiler or a water supply tank (not shown).

By driving the circulation pump 17 and circulating a predetermined amount of condensate in the circulation path 19, the condensate in the high-pressure condensate reservoir 11 is sucked by the ejector 18, and the condensate is recovered from the condensate recovery pipe 20. It is to be collected.

The condensate pumping member 5 is connected to the lower side of the low-pressure condensate reservoir 12 via a pipe line 22. The condensate pumping member 5 has a condensate inlet 23, a condensate outlet 24, a high-pressure operating fluid inlet 25, and a high-pressure operating fluid outlet 26, and a conduit is connected to the condensate inlet 23 via a check valve 27. 22 is connected.

A check valve 27 attached to the pipe line 22 allows the condensate to flow from the low-pressure condensate reservoir 12 into the condensate pumping member 5, and prevents the reverse condensate flow. Similarly, a condensate pressure feeding pipe 29 is connected to the condensate outlet 24 via a check valve 28. The check valve 28 has a function of allowing the condensate to flow from the condensate pressure-feeding member 5 to the condensate pressure-feeding pipe 29 and blocking the opposite flow. The upper end of the condensate pressure-feed pipe 29 is connected to the inlet of the high-pressure condensate pipe 14 of the high-pressure condensate reservoir 11 so that the condensate of the condensate pressure-feed member 5 is supplied into the high-pressure condensate reservoir 11. Like that.

A high-pressure steam pipe 30 is connected to the high-pressure operating fluid inlet 25. On the other hand, the high-pressure operating fluid discharge port 26 communicates with the atmosphere through the discharge pipe 31.

The condensate pressure-feeding member 5 closes the high-pressure operating fluid introduction port 25 and opens the high-pressure operating fluid discharge port 26 when a float (not shown) disposed therein is located in the lower part. Condensate flows down into the condensate pressure feeding member 5 through the check valve 27 and the condensate inlet 23.

When condensate accumulates in the condensate pumping member 5 and a float (not shown) is positioned at a predetermined upper portion, the high-pressure operation fluid discharge port 26 is closed, while the high-pressure operation fluid introduction port 25 is opened and the high-pressure steam pipe 30 is opened. Then, the condensate accumulated inside is pumped into the high-pressure condensate reservoir 11 through the condensate outlet 24, the check valve 28 and the condensate pressure-feed pipe 29.

  When the condensate is pumped and the liquid level in the condensate pumping member 5 is lowered, the high pressure operation fluid inlet 25 is closed again, and the high pressure operation fluid discharge port 26 is opened, thereby condensate from the condensate inlet 23. Flow down to the inside. By repeating such an operation cycle, the condensate pressure feeding member 5 pumps the condensate in the low pressure condensate reservoir 12 to the high pressure condensate reservoir 11.

  The high-pressure condensate supplied from the high-pressure condensate pipe 14 into the high-pressure condensate reservoir 11 is partially re-evaporated in the container 11 to be re-evaporated vapor and sucked into the steam ejector 2 and re-evaporated. The condensate that did not exist is sucked into the condensate recovery pump 4 through the pipe line 16.

  Similarly, the low-pressure condensate supplied from the low-pressure condensate pipe 15 into the low-pressure condensate reservoir 12 is partially re-evaporated in the container 12 to be re-vaporized and sucked into the steam ejector 3 for re-evaporation. The low-pressure condensate that has not been sent is pumped into the high-pressure condensate reservoir 11 by the condensate pumping member 5.

  In this way, by sucking the re-evaporated vapor with the steam ejectors 2 and 3 and supplying the re-evaporated vapor to the location where the vapor is used, there is no re-evaporated vapor released into the atmosphere, and vapor loss, that is, thermal energy loss can be eliminated. .

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 Steam supply pipe 2 Steam ejector 3 Steam ejector 4 Condensate recovery pump 5 Liquid pumping member 11 High pressure condensate reservoir 12 Low pressure condensate reservoir 14 High pressure condensate pipe 15 Low pressure condensate pipe 17 Circulation pump 18 Ejector 20 Condensate recovery pipe 23 Condensate inlet 24 Condensate outlet 25 High-pressure operating fluid inlet 26 High-pressure operating fluid outlet 29 Condensate pressure feed pipe 30 High-pressure steam pipe 31 Drain pipe

Claims (1)

A steam ejector that sucks the re-evaporated steam, which is part of the condensate, is collected when the condensate generated in the steam-using equipment is collected by a condensate recovery pump to a condensate recovery destination such as a boiler or a water supply tank. At the same time, the suction part of each steam ejector is connected to the high-pressure condensate reservoir and the low-pressure condensate reservoir, and the condensate recovery pump collects the condensate below the high-pressure condensate reservoir to the condensate recovery destination. The condensate pumping member is connected below the low-pressure condensate reservoir, and the condensate outlet of the condensate pumping member is connected to the inlet of the high-pressure condensate pipe of the high-pressure condensate reservoir. A condensate recovery apparatus, wherein the condensate of the water pressure feeding member is supplied to a high pressure condensate reservoir .

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