JP2011085326A - Condensate recovery device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a condensate recovery device which securely traps foreign matters such as rust included in condensate and directly recovers the condensate to a condensate recovery destination such as a boiler. <P>SOLUTION: A condensate supply pipe 1 is connected to a condensate tank 2. The condensate tank 2 is connected to condensate pressure feed means 3, 4 by condensate inflow pipe lines 11, 12 within the condensate tank 2. A filter members 7 is mounted to the condensate outflow ports 13, 14 of the condensate pressure feed means 3, 4 via condensate recovery pipes 5, 6. A back wash condensate inlet 30 is provided in the filter member 7. Foreign matters are removed from condensate discharged from the condensate pressure feed means 4 by the filter member 7, and then, the condensate is pressure-fed to the condensate recovery destination. Back wash of the cylindrical filter 28 of the filter member 7 is performed by the condensate discharged from the condensate pressure feed means 3. <P>COPYRIGHT: (C)2011,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.

In the conventional condensate recovery device, if foreign matter such as dust, rust, or scale is mixed in the condensate recovered from the condensate outflow pipe to the condensate recovery destination, the condensate recovery destination such as a boiler is recovered. There was a problem that water could not be collected directly.
Japanese Patent Publication No. 60-42846

  The problem to be solved is to obtain a condensate recovery device that can reliably capture foreign matter such as rust mixed in the condensate and recover the condensate directly to a condensate recovery destination such as a boiler. It is.

  The present invention comprises a condensate tank that temporarily stores condensate generated in steam-using equipment and a condensate pumping means connected to the condensate tank, and a part of the pumped condensate from the condensate pumping means is recovered. When collecting water from the water recovery pipe to the condensate recovery destination, place a plurality of condensate pumping means and attach a filter member to trap the foreign substances in the condensate to the condensate recovery pipes of the multiple condensate pumping means. Then, when at least one of the plurality of condensate pumping means is operated, the filter member is backwashed to remove the captured foreign matter.

  The present invention captures foreign matter such as rust mixed in the condensate by attaching a filter member to the condensate recovery pipes of a plurality of condensate pumping means connected to the condensate tank. Thus, the condensate from which foreign substances have been removed can be recovered directly to a condensate recovery destination such as a boiler.

  As a filter member to be attached to the condensate recovery pipe of the present invention, a punching plate having a large number of fine holes penetrating according to foreign matter mixed in the condensate, a metal laminated filter in which thin metal fibers are laminated, or A conventionally known filter member such as a sintered metal provided with a large number of through pores can be used.

  In FIG. 1, a condensate recovery apparatus is constituted by the condensate supply pipe 1, the condensate tank 2, the condensate pumping means 3, 4, and the filter member 7 attached to the condensate recovery pipes 5, 6.

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 tank 2. The condensate tank 2 has a sealed cylindrical shape, and condensate inflow conduits 11 and 12 connected to the condensate inflow ports 9 and 10 of the condensate pumping means 3 and 4 are arranged vertically. The upper ends of the condensate inflow pipes 11 and 12 are opened, so that the condensate accumulated in the condensate tank 2 flows from the upper end opening into the condensate pumping means 3 and 4 through the condensate inlets 9 and 10. To do.

Condensate inlets 9 and 10 and condensate outlets 13 and 14, high-pressure operating fluid inlets 15 and 16, and high-pressure operating fluid outlets 17 and 18 are disposed in the condensate pumping means 3 and 4, respectively. Check valves 19 and 20 are attached to the condensate inflow pipelines 11 and 12. The check valves 19 and 20 have a function of allowing the condensate to flow from the condensate tank 2 to the condensate pumping means 3 and 4 but preventing the condensate from passing in the opposite direction.

Check valves 21 and 22 are also attached to the condensate recovery pipes 5 and 6. These check valves 21 and 22 have a function of allowing the condensate to flow from the condensate pumping means 3 and 4 to the filter member 7 and blocking the flow in the opposite direction.

High-pressure steam supply pipes 23 and 24 are connected to the high-pressure operation fluid introduction ports 15 and 16, respectively, and high-pressure steam discharge pipes 25 and 26 are connected to the high-pressure operation fluid discharge ports 17 and 18, respectively.

The condensate pumping means 3 and 4 close the high-pressure operating fluid inlets 15 and 16 and open the high-pressure operating fluid discharge ports 17 and 18 when a float (not shown) disposed inside is located in the lower part. Thus, the condensate is caused to flow down from the condensate inflow conduits 11 and 12 into the condensate pumping means 3 and 4 through the check valves 19 and 20 and the condensate inlets 9 and 10.

The filter member 7 includes a condensate inlet 27, a filter 28, a condensate outlet 29, and a backwash condensate inlet 30. The condensate inlet 27 is connected to the condensate outlet 14 of the condensate pumping means 4 through the condensate recovery pipe 6. The backwash condensate inlet 30 is connected to the condensate outlet 13 of the condensate pumping means 3 through the condensate recovery pipe 5.

A conduit 32 is connected to the condensate outlet 29 via an on-off valve 31 to connect to the condensate recovery destination. The filter 28 has a vertically long cylindrical shape and can capture foreign matters such as rust mixed in the condensate flowing down from the condensate inlet 27 to the condensate outlet 29.

A foreign matter discharge conduit 33 communicating with the inside and outside of the cylindrical filter 28 is connected to the lower portion of the filter member 7. A check valve 34 is attached to the foreign matter discharge conduit 33. The check valve 34 allows the condensate to pass from the filter member 7 side to the foreign matter discharge pipe 33 side, and prevents the condensate from passing in the opposite direction. Further, the valve opening pressure ΔP of the check valve 34 is higher than the operating pressure P4 of the condensate pumping means 4 and lower than the operating pressure P3 of the condensate pumping means 3, that is, P4. The design is such that the relationship <ΔP <P3 holds.

The condensate inflow conduit 11 in the condensate tank 2 opens at the upper end above the conduit 12, so that the condensate in the condensate tank 2 preferentially passes through the condensate inflow conduit 12. It flows into the water pressure feeding means 4.

When condensate preferentially accumulates in the condensate pumping means 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 16 is opened to increase the pressure. By supplying high pressure pumping steam from the steam supply pipe 24 into the interior, the condensate accumulated therein is converted into the condensate outlet 14, the check valve 22, the cylindrical filter 28 of the filter member 7, the condensate outlet 29, and the on-off valve. 31 and the pipe 32 to be pumped to a condensate collection destination such as a boiler. In this case, since the valve opening pressure ΔP of the check valve 34 in the foreign matter discharge pipe 33 is higher than the operating pressure P4 of the condensate pressure feeding means 4, the check valve 34 does not open.

Thus, the condensate discharged from the condensate outlet 14 passes through the filter member 7 to remove foreign matters such as rust mixed in the condensate, and is pumped to the condensate collection destination.

  When the condensate is pumped and the liquid level in the condensate pumping means 4 decreases, the high-pressure operating fluid inlet 16 is closed again, and the high-pressure operating fluid outlet 18 is opened, so that the condensate flows from the condensate inlet 10. Flow down to the inside. Condensate is recovered by repeating such an operating cycle.

  If the cylindrical filter 28 of the filter member 7 becomes clogged with the operation of the condensate pumping means 4, the condensate cannot be discharged from the condensate pumping means 4, and the liquid level in the condensate tank 2 is reduced. Rises, the condensate flows down from the condensate inflow conduit 11 into the condensate pumping means 3, performs the same operation cycle as the above-described condensate pumping means 4, and the condensate is discharged from the condensate outlet 13. Thus, condensate is supplied from the backwash condensate inlet 30 to the inside of the cylindrical filter 28 of the filter member 7. In this case, by closing the on-off valve 31 of the conduit 32, the condensate passes from the inside to the outside of the filter 28, and the foreign matter captured by backwashing the filter 28 is removed. The passage 33 and the check valve 34 can be passed out of the system.

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

1 Condensate supply pipe 2 Condensate tank 3, 4
Condensate pumping means 5, 6
Condensate recovery pipe 7 Filter member 9, 10 Condensate inlet 11, 12 Condensate inflow pipe 13, 13 Condensate outlet 15, 16 High pressure operating fluid inlet 17, 18 High pressure operating fluid outlet 23, 24 High pressure steam supply pipe 27 Condensate inlet 28 Filter 29 Condensate outlet 30 Backwash condensate inlet 31 On-off valve 33 Foreign matter discharge conduit 34 Check valve

Claims (1)

  It consists of a condensate tank that temporarily stores condensate generated from steam-using equipment and condensate pressure feeding means connected to the condensate tank, and a part of the pressure condensate from the condensate pressure feeding means is taken from the condensate recovery pipe. In the collection to the condensate collection destination, a plurality of condensate pumping means are arranged, and a filter member for capturing foreign substances in the condensate is attached to the condensate recovery pipes of the plurality of condensate pumping means. The condensate recovery apparatus is characterized in that when the at least one of the condensate pumping means operates, the filter member is backwashed to remove the trapped foreign matter.