US3792719A - Self-cleaning flow restricting device - Google Patents

Self-cleaning flow restricting device Download PDF

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US3792719A
US3792719A US00190942A US3792719DA US3792719A US 3792719 A US3792719 A US 3792719A US 00190942 A US00190942 A US 00190942A US 3792719D A US3792719D A US 3792719DA US 3792719 A US3792719 A US 3792719A
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disposed
inlet
flow restricting
outlet
restricting device
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US00190942A
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J Dickinson
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CBS Corp
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Westinghouse Electric Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K43/00—Auxiliary closure means in valves, which in case of repair, e.g. rewashering, of the valve, can take over the function of the normal closure means; Devices for temporary replacement of parts of valves for the same purpose
    • F16K43/001—Auxiliary closure means in valves, which in case of repair, e.g. rewashering, of the valve, can take over the function of the normal closure means; Devices for temporary replacement of parts of valves for the same purpose an auxiliary valve being actuated independently of the main valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/04—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only lift valves
    • F16K11/044—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only lift valves with movable valve members positioned between valve seats
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/794—With means for separating solid material from the fluid
    • Y10T137/8013—Sediment chamber
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87265—Dividing into parallel flow paths with recombining

Definitions

  • ABSTRACT A continuous blow down having a plug-resistant flow restricting device and a pair of two-way valves so disposed in a single housing that the flow through the restricting device can be easily reversed to facilitate cleaning the restricting device while it is in service.
  • This invention relates to steam turbines and more particularly to a positive drain for the associated power plant piping and vessels, which must be drained of water to prevent damage to the turbine due to water accumulating in the piping and flowing back into the turbine.
  • Certain extraction piping and feed water heater bleed piping from the turbine should be provided with positive drains, to prevent accumulation of water therein. If allowed to accumulate, the water may flow back into the turbine, or flash due to a reduction of pressure resulting from a rapid reduction or loss of load on the generator, and cause a slug of water to enter the turbine.v
  • Positive drains such as an orifice or restriction are also utilized to prevent the build-up of water in the piping, however, they also become clogged, even when protected by strainers, which may themselves become plugged.
  • a self-cleaning flow restriction when made in accordance with this invention, comprises a flow restricting device and a device for alternately reversing the flow through the flow restricting device.
  • FIG. 1 is a flow diagram of a turbo-generator unit having a self-cleaning flow restricting device made in accordance with this invention disposed therein;
  • FIG. 2 is an enlarged sectional view of the selfcleaning flow restricting device.
  • FIG. 1 shows a flow diagram of a turbo-generator 1, wherein motive steam from a boiler (not shown) flows through a supply conduit 2 and stop valve 3 to a turbine 4, and is exhausted to a condenser 5. Extraction or bleed steam is withdrawn from the motive steam through extraction piping or conduit 7 to some intermediate stage of the turbine and to provide the steam for a feedwater heater 9, which heats the condensate being returned to the boiler.
  • a drain pipe or conduit 11 is disposed between the extraction piping 7 and the condenser 5 and contains a self-cleaning flow restricting device 13, which will be described in detail hereinafter.
  • Condensate collected in a hotwell 14 of the condenser 5 is pumped from the condenser to the feedwater heater 9 by a condensate pump 15.
  • the condensate then flows through the tubes of the feedwater heater 9 and is then picked up by a boiler feed pump 16 and pumped to the boiler, where it is again converted to motive steam.
  • the self-cleaning flow restricting device 13 comprises a duct 17 sized to restrict the flow therethrough to a predetermined amount and a plurality of apertures or ports 19 disposed at both ends of the duct 17, each aperture 19 having an open area smaller than the open area of the duct 17, a pair of two-way valves 21 and 22, disposed on each side of the duct 17 and a plurality of passageways or chambers 23, 24, 25, and 26, so disposed, that when the valves 21 and 22 are set in one position, fluid flows through the duct 17 in one direction, and when the valves 21 and 22 are set in another position, fluid flows through the valve in the opposite direction blowing debris, which collected on the apertures 19, to the drain.
  • the passageways and valves being arranged to allow the direction of flow to be reversed without removing the restriction from service, and thus provide for periodic flow reversals which blow debris collected on the apertures 19 to the drain, while the turbo-generator is operating.
  • valves 21 and 22 are hand operated, however, they could be adapted to operate automatically to reverse the direction of flow through the restriction periodically by utilizing electric, hydraulic or pneumatic operated drives to open and close the valves 21 and 22, and appropriate means to automatically operate the drives so that when one valve opens the other valve closes.
  • valves 21 and 22 and restricting duct 17 are disposed in a rectangular shape casing or casting 29.
  • the casing 29 has an inlet duct or port 31 in communication with the conduit 7 and the inlet chamber 23, which is disposed lengthwise adjacent one wall 33 of the casing 29.
  • An outlet duct or port 35 is disposed so as to be in communication with the outlet chamber 24 and the drain conduit 11 connecting the outlet port 35 to the condensor 5.
  • the outlet chamber 24 is disposed lengthwise adjacent a wall 39 parallel the one wall 33.
  • a pair of intermediate chambers 25 and 26 are placed in communication by the restricting duct 17 and are disposed between the inlet and outlet chambers 23 and 24.
  • Each intermediate chamber 25 or 26 has an inlet port 41 and 42, respectively, and an outlet port 43 and 44, respectively, which place the intermediate chambers in communication with the inlet chambers 23 and 24.
  • Each inlet port 41 or 42 and outlet port 43 or 44 has a valve seat 45 disposed on the intermediate chamber side thereof and a double seated valve plug 47 is adapted to plug the inlet port, when disposed in one position, and the outlet port, when disposed in another position.
  • the valve plugs 47 are each disposed on the end of a valve stem 49, which extends through the outlet port 43 or 44, the wall 39, packing glands 50, and yokes 51.
  • the outboard ends of the valve stems 49 have threads 53 which engage intemal threads 55 in the yokes 51.
  • the valve stems 49 have hand wheels 59 fastened thereto to provide manual operation of the valves 21 and 22.
  • a drip pot 6 depends from the casing 29 and is in communication with the inlet chamber 23 and is axially aligned with the inlet port 31 for collecting large particles of debris being carried into the inlet chamber 23 by fluid flowing therein.
  • a blow down valve 61 closes the lower end of the dip pot 60 and may be opened to blow out debris collected therein, while the turbogenerator is operating.
  • the self-cleaning restriction device as hereinbefore described advantageously provides a continuous drain, which can be periodically cleaned, while in service to prevent clogging, and thereby eliminate water pockets in the extraction or bleed piping, which could inadvertentally flow back to the turbine or flash dueto a sudden drop in pressure resulting from a sudden drop or loss of load on the generator and carry back slugs of water to the turbine, thus preventing water from entering the turbine and causing damage thereto.
  • a self-cleaning flow restricting device comprising posed between said inlet and outlet chambers and each intermediate chamber having one of said inlet and outlet ports disposed therein placing said intermediate chambers in communication with said inlet and outlet chambers, and a valve plug so disposed within each intermediate chamber that when said outlet port in one intermediate chamber is plugged the associated inlet port is open and vice versa; said first chamber having a drip pot depending therefrom for collecting large particles of debris; and flow restricting means disposed between said intermediate chambers.

Abstract

A continuous blow down having a plug-resistant flow restricting device and a pair of two-way valves so disposed in a single housing that the flow through the restricting device can be easily reversed to facilitate cleaning the restricting device while it is in service.

Description

United States Patent [191 Dickinson [451 Feb. 19, 1974 SELF-CLEANING FLOW RESTRICTING DEVICE Inventor: John 1). Dickinson, Swarthmore, Pa.
Assignee: Westinghouse Electric Corporation,
Pittsburgh, Pa.
Filed: Oct. 20, 1971 Appl. No.: 190,942
11.8. C1 137/546, 210/427, 137/599 Int. Cl. F16k 51/00 Field of Search 210/411, 427, 423; 137/546,
References Cited UNITED STATES PATENTS I 12/1866 Hayes 210/427 137,653 4/1873 Brown et a1. 210/427 Primary Examiner-Henry T. Klinksiek Attorney, Agent, or FirmF. .l. Baehr, Jr.
[5 7] ABSTRACT A continuous blow down having a plug-resistant flow restricting device and a pair of two-way valves so disposed in a single housing that the flow through the restricting device can be easily reversed to facilitate cleaning the restricting device while it is in service.
4 Claims, 2 Drawing Figures 'PATENTEDFEBISISM A 3.792.719
FROM 2 BOILER GENERATOR LOAD F ow TE BOILER EE A R f HEATER SELF-CLEANING F LOW RESTRICTING DEVICE BACKGROUND OF THE INVENTION This invention relates to steam turbines and more particularly to a positive drain for the associated power plant piping and vessels, which must be drained of water to prevent damage to the turbine due to water accumulating in the piping and flowing back into the turbine.
Certain extraction piping and feed water heater bleed piping from the turbine should be provided with positive drains, to prevent accumulation of water therein. If allowed to accumulate, the water may flow back into the turbine, or flash due to a reduction of pressure resulting from a rapid reduction or loss of load on the generator, and cause a slug of water to enter the turbine.v
Steam traps, which drain water from the piping are in use, however, they are not 100 percent safe, as they become clogged by debris normally found in extraction and bleed piping.
Positive drains, such as an orifice or restriction are also utilized to prevent the build-up of water in the piping, however, they also become clogged, even when protected by strainers, which may themselves become plugged.
Large base load turbo-generators may be shut down as seldom as once a year, therefore some type of positive drain which can be cleaned in service is essential to positively prevent water from collecting in the extraction or bleed piping and to negate the possibility of slugsof water being passed through the turbine and causing damage thereto.
SUMMARY OF THE INVENTION In general, a self-cleaning flow restriction, when made in accordance with this invention, comprises a flow restricting device and a device for alternately reversing the flow through the flow restricting device.
BRIEF DESCRIPTION OF THE DRAWINGS The objects and advantages of this invention will become more apparent from reading the following detailed description in connection with the accompanying drawings, in which:
FIG. 1 is a flow diagram of a turbo-generator unit having a self-cleaning flow restricting device made in accordance with this invention disposed therein; and
FIG. 2 is an enlarged sectional view of the selfcleaning flow restricting device.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings in detail, FIG. 1 shows a flow diagram of a turbo-generator 1, wherein motive steam from a boiler (not shown) flows through a supply conduit 2 and stop valve 3 to a turbine 4, and is exhausted to a condenser 5. Extraction or bleed steam is withdrawn from the motive steam through extraction piping or conduit 7 to some intermediate stage of the turbine and to provide the steam for a feedwater heater 9, which heats the condensate being returned to the boiler. A drain pipe or conduit 11 is disposed between the extraction piping 7 and the condenser 5 and contains a self-cleaning flow restricting device 13, which will be described in detail hereinafter. Condensate collected in a hotwell 14 of the condenser 5 is pumped from the condenser to the feedwater heater 9 by a condensate pump 15. The condensate then flows through the tubes of the feedwater heater 9 and is then picked up by a boiler feed pump 16 and pumped to the boiler, where it is again converted to motive steam.
While the flow diagram only shows a single selfcleaning flow restricting device 13, it is understood that a plurality of such devices would be utilized in an operational system.
As shown in FIG. 2, the self-cleaning flow restricting device 13 comprises a duct 17 sized to restrict the flow therethrough to a predetermined amount and a plurality of apertures or ports 19 disposed at both ends of the duct 17, each aperture 19 having an open area smaller than the open area of the duct 17, a pair of two- way valves 21 and 22, disposed on each side of the duct 17 and a plurality of passageways or chambers 23, 24, 25, and 26, so disposed, that when the valves 21 and 22 are set in one position, fluid flows through the duct 17 in one direction, and when the valves 21 and 22 are set in another position, fluid flows through the valve in the opposite direction blowing debris, which collected on the apertures 19, to the drain. The passageways and valves being arranged to allow the direction of flow to be reversed without removing the restriction from service, and thus provide for periodic flow reversals which blow debris collected on the apertures 19 to the drain, while the turbo-generator is operating.
The valves 21 and 22, as shown in FIG. 2, are hand operated, however, they could be adapted to operate automatically to reverse the direction of flow through the restriction periodically by utilizing electric, hydraulic or pneumatic operated drives to open and close the valves 21 and 22, and appropriate means to automatically operate the drives so that when one valve opens the other valve closes.
As shown in the drawing, the valves 21 and 22 and restricting duct 17 are disposed in a rectangular shape casing or casting 29. The casing 29 has an inlet duct or port 31 in communication with the conduit 7 and the inlet chamber 23, which is disposed lengthwise adjacent one wall 33 of the casing 29. An outlet duct or port 35 is disposed so as to be in communication with the outlet chamber 24 and the drain conduit 11 connecting the outlet port 35 to the condensor 5. The outlet chamber 24 is disposed lengthwise adjacent a wall 39 parallel the one wall 33. A pair of intermediate chambers 25 and 26 are placed in communication by the restricting duct 17 and are disposed between the inlet and outlet chambers 23 and 24. Each intermediate chamber 25 or 26 has an inlet port 41 and 42, respectively, and an outlet port 43 and 44, respectively, which place the intermediate chambers in communication with the inlet chambers 23 and 24. Each inlet port 41 or 42 and outlet port 43 or 44 has a valve seat 45 disposed on the intermediate chamber side thereof and a double seated valve plug 47 is adapted to plug the inlet port, when disposed in one position, and the outlet port, when disposed in another position. The valve plugs 47 are each disposed on the end of a valve stem 49, which extends through the outlet port 43 or 44, the wall 39, packing glands 50, and yokes 51. The outboard ends of the valve stems 49 have threads 53 which engage intemal threads 55 in the yokes 51. The valve stems 49 have hand wheels 59 fastened thereto to provide manual operation of the valves 21 and 22.
A drip pot 6!) depends from the casing 29 and is in communication with the inlet chamber 23 and is axially aligned with the inlet port 31 for collecting large particles of debris being carried into the inlet chamber 23 by fluid flowing therein. A blow down valve 61 closes the lower end of the dip pot 60 and may be opened to blow out debris collected therein, while the turbogenerator is operating.
The self-cleaning restriction device as hereinbefore described advantageously provides a continuous drain, which can be periodically cleaned, while in service to prevent clogging, and thereby eliminate water pockets in the extraction or bleed piping, which could inadvertentally flow back to the turbine or flash dueto a sudden drop in pressure resulting from a sudden drop or loss of load on the generator and carry back slugs of water to the turbine, thus preventing water from entering the turbine and causing damage thereto.
What is claimed is:
l. A self-cleaning flow restricting device comprising posed between said inlet and outlet chambers and each intermediate chamber having one of said inlet and outlet ports disposed therein placing said intermediate chambers in communication with said inlet and outlet chambers, and a valve plug so disposed within each intermediate chamber that when said outlet port in one intermediate chamber is plugged the associated inlet port is open and vice versa; said first chamber having a drip pot depending therefrom for collecting large particles of debris; and flow restricting means disposed between said intermediate chambers.
2. A self-cleaning flow restricting device as set forth in claim 1, wherein the drip pot has means disposed therein for blowing it down while in operation.
3. A self-cleaning flow restricting device as set forth in claim 1, wherein the drip pot has a blow down valve disposed on the lower end thereof.
4. A self-cleaning flow restricting device as set forth in claim 1, wherein the flow restricting means comprises a duct having an open area sufficiently small to restrict the flow to a predetermined amount and a pluraiity of ports at both ends of the duct, each port having an open area smaller than the open area of the duct.

Claims (4)

1. A self-cleaning flow restricting device comprising an inlet chamber having an inlet duct and a pair of outlet ports having a valve seat disposed in each of said ports and an outlet chamber having an outlet duct and a pair of inlet ports having a valve seat disposed in each of said inlet ports; a pair of intermediate chambers disposed between said inlet and outlet chambers and each intermediate chamber having one of said inlet and outlet ports disposed therein placing said intermediate chambers in communication with said inlet and outlet chambers, and a valve plug so disposed within each intermediate chamber that when said outlet port in one intermediate chamber is plugged the associated inlet port is open and vice versa; said first chamber having a drip pot depending therefrom for collecting large particles of debris; and flow restricting means disposed between said intermediate chambers.
2. A self-cleaning flow restricting device as set forth in claim 1, wherein the drip pot has means disposed therein for blowing it down while in operation.
3. A self-cleaning flow restricting device as set forth in claim 1, wherein the drip pot has a blow down valve disposed on the lower end thereof.
4. A self-cleaning flow restricting device as set forth in claim 1, wherein the flow restricting means comprises a duct having an open area sufficiently small to restrict the flow to a predetermined amount and a plurality of ports at both ends of the duct, each port having an open area smaller than the open area of the duct.
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5893390A (en) * 1996-01-16 1999-04-13 Texas Instruments Incorporated Flow controller
US6082398A (en) * 1996-11-05 2000-07-04 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Device for regulating the flow of gases having substantially different molar masses
US20100048884A1 (en) * 2008-07-16 2010-02-25 Srinivas Kilambi Solvo-thermal hydrolysis of cellulose
US20100069626A1 (en) * 2008-07-16 2010-03-18 Sriya Innovations Nano-catalytic-solvo-thermal technology platform bio-refineries
US8409357B2 (en) 2011-05-04 2013-04-02 Renmatix, Inc. Self-cleaning apparatus and method for thick slurry pressure control
US8759498B2 (en) 2011-12-30 2014-06-24 Renmatix, Inc. Compositions comprising lignin
US8840995B2 (en) 2011-05-04 2014-09-23 Renmatix, Inc. Lignin production from lignocellulosic biomass
US10053745B2 (en) 2010-01-19 2018-08-21 Renmatix, Inc. Production of fermentable sugars and lignin from biomass using supercritical fluids
US10793646B2 (en) 2014-09-26 2020-10-06 Renmatix, Inc. Adhesive compositions comprising type-II cellulose

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US60512A (en) * 1866-12-18 Improvement in fh
US137653A (en) * 1873-04-08 Improvement in filters

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US60512A (en) * 1866-12-18 Improvement in fh
US137653A (en) * 1873-04-08 Improvement in filters

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5893390A (en) * 1996-01-16 1999-04-13 Texas Instruments Incorporated Flow controller
US6082398A (en) * 1996-11-05 2000-07-04 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Device for regulating the flow of gases having substantially different molar masses
US8546560B2 (en) 2008-07-16 2013-10-01 Renmatix, Inc. Solvo-thermal hydrolysis of cellulose
US20100069626A1 (en) * 2008-07-16 2010-03-18 Sriya Innovations Nano-catalytic-solvo-thermal technology platform bio-refineries
US8546561B2 (en) 2008-07-16 2013-10-01 Renmatix, Inc. Nano-catalytic-solvo-thermal technology platform bio-refineries
US20100048884A1 (en) * 2008-07-16 2010-02-25 Srinivas Kilambi Solvo-thermal hydrolysis of cellulose
US10053745B2 (en) 2010-01-19 2018-08-21 Renmatix, Inc. Production of fermentable sugars and lignin from biomass using supercritical fluids
US10858712B2 (en) 2010-01-19 2020-12-08 Renmatix, Inc. Production of fermentable sugars and lignin from biomass using supercritical fluids
US8409357B2 (en) 2011-05-04 2013-04-02 Renmatix, Inc. Self-cleaning apparatus and method for thick slurry pressure control
US8801859B2 (en) 2011-05-04 2014-08-12 Renmatix, Inc. Self-cleaning apparatus and method for thick slurry pressure control
US8840995B2 (en) 2011-05-04 2014-09-23 Renmatix, Inc. Lignin production from lignocellulosic biomass
US8759498B2 (en) 2011-12-30 2014-06-24 Renmatix, Inc. Compositions comprising lignin
US9963555B2 (en) 2011-12-30 2018-05-08 Renmatix, Inc. Compositions comprising lignin
US10793646B2 (en) 2014-09-26 2020-10-06 Renmatix, Inc. Adhesive compositions comprising type-II cellulose

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