WO1999047854A1 - Method and device for measuring the reject water flow in a steam generator - Google Patents

Method and device for measuring the reject water flow in a steam generator Download PDF

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Publication number
WO1999047854A1
WO1999047854A1 PCT/FI1999/000187 FI9900187W WO9947854A1 WO 1999047854 A1 WO1999047854 A1 WO 1999047854A1 FI 9900187 W FI9900187 W FI 9900187W WO 9947854 A1 WO9947854 A1 WO 9947854A1
Authority
WO
WIPO (PCT)
Prior art keywords
level
water
reject
sensor
level sensor
Prior art date
Application number
PCT/FI1999/000187
Other languages
French (fr)
Inventor
Mauri Salmisuo
Original Assignee
Amsco Europe Inc. Suomen Sivuliike
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Amsco Europe Inc. Suomen Sivuliike filed Critical Amsco Europe Inc. Suomen Sivuliike
Priority to AU27304/99A priority Critical patent/AU2730499A/en
Publication of WO1999047854A1 publication Critical patent/WO1999047854A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
    • G01F11/28—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with stationary measuring chambers having constant volume during measurement
    • G01F11/284—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with stationary measuring chambers having constant volume during measurement combined with electric level detecting means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F3/00—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow
    • G01F3/36—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with stationary measuring chambers having constant volume during measurement
    • G01F3/38—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with stationary measuring chambers having constant volume during measurement having only one measuring chamber

Definitions

  • the invention relates to the production of pure distillate or water steam. Particularly, the invention is directed to a method of measuring the reject water flow of a still or steam generator using level sensors.
  • Water steam of high quality is required, for example in pharmaceutical and biotechnical production, for sterilization and other purposes.
  • Especially pure steam can be defined as "water for injection” in the gas phase.
  • water for injection in the gas phase.
  • it is thus also pyrogen free.
  • the product flow thus arrives at the lowermost point of the device, turns 180° and then flows in a spiral pattern upwards, whereby impurities separate by centrifugal force to the periphery of the spiral path and depart, flowing downwards as the pure product flow continues it upward motion.
  • a small volume of water is formed in the bottom section of the device, the impurities thus collecting into that volume.
  • This amount of water having a certain ratio to the amount of produced steam, exits as a reject stream. For retaining the quality of the produced steam, said ratio must be kept within certain limits.
  • distillate may be produced by condensing the product steam to water.
  • a method according to claim 1 has now been invented for measuring the amount of reject water from a steam generator or a still, in which two level sensors, provided in the reject water exit tube with a specified vertical distance relative to each other, control a valve arranged below said sensors to effect opening of the valve as the water level reaches the up- per level sensor, .and to effect closing of the valve as the water level reaches the lower level sensor.
  • a further object of the invention is a device according to claim 2, comprising a non- horizontal reject water exit tube or a branch or vessel connected thereto provided with a first level sensor to indicate a water level reaching said first level sensor, and at a lower level than said first level sensor a second level sensor to indicate a water level reaching said second level sensor, and at a lower level than said second level sensor a valve arranged to open by the signal from the first level sensor, .and to close by the signal from the second level sensor.
  • the level sensors are provided in a branch of the exit tube, the lower end of which branch communicates with the exit tube above the valve, while the upper end communicates with the bottom section of the still or steam generator.
  • the level sensors may be fitted in the exit tube proper, or in any side vessel communicating with the exit tube so as to provide a common water level.
  • the type of level sensor may be swimmer-switch, inductive, or any other type suitable for the conditions, as the person skilled in the art will contemplate.
  • the ambiguities relating to the measurement of reject water connected with the solutions according to the prior art are avoided.
  • the volume corresponding to the vertical distance of the level sensors is known, and the rate of opening and closing of the valve is recorded over time, the water flow per unit time can be determined.
  • the reject ratio of the still or steam generator is easily calculated by means of control electronics well known to the skilled person. 3
  • the system may include additional level sensors, for example mounted on a higher level than the aforementioned upper sensor.
  • additional level sensors for example mounted on a higher level than the aforementioned upper sensor.
  • Such a sensor may provide, for example, a high level alarm indicating malfunction of the sensors below.
  • Figure 1 shows a schematic view of a steam generator according to the invention; the generator may constitute part of a still apparatus.
  • Preheated feed water enters the still or steam generator (1) through line (2) and evaporates in the downflow channels (3), heat being transferred from the heating steam (4).
  • the flow makes a 180° turn, and is freed of droplets and foreign matter in the upflow channels (6).
  • a minor volume of water en- riched in impurities is formed in said upflow channel and collects in the bottom section (5) of the device, and exits as a reject stream through line (7).
  • a branch (8) is provided in line (7), the upper part of which branch communicates with the bottom section of the still or steam generator.
  • Sensor (10) thereby transmits a signal to the control system, which opens valve (9). Water flows out until the level reaches sensor (11), the signal of which effects the closing of valve (9).
  • the volume of tubing (7,8) corresponding to the vertical distance of level sensors (10,11) is easily determined; as the control electronics monitors the rate of opening of valve (9), the flow rate of reject water is thus defined with sufficient accuracy.
  • the product steam is condensed in condenser (12).

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

In the production of clean steam, a certain amount of water is removed from the process as a reject stream. To maintain product steam quality, the ratio of the reject stream to the product stream must be above a given threshold value. Measurement of the reject stream by conventional methods is difficult. According to the invention, a shutoff valve is provided in the reject line with two level sensors fitted at higher, separate levels. As the valve opens at the signal from the upper level sensor and closes at the signal from the lower sensor, and the volume corresponding to the tubing between the level sensors is known, the reject flow can be measured. A method and a device providing for measurement according to the invention are disclosed.

Description

1
METHOD AND DEVICE FOR MEASURING THE REJECT WATER FLOW IN A STEAM GENERATOR
Field of the invention The invention relates to the production of pure distillate or water steam. Particularly, the invention is directed to a method of measuring the reject water flow of a still or steam generator using level sensors.
Background of the invention Water steam of high quality is required, for example in pharmaceutical and biotechnical production, for sterilization and other purposes. Especially pure steam can be defined as "water for injection" in the gas phase. In addition to being sterile and free of the impurities of the feed water, it is thus also pyrogen free.
In the production of pure water steam, it is essential that droplets of water and other non- gaseous impurities, as well as other gases than water steam are removed from the product steam flow. For this purpose, devices are normally fitted with various demisting baffles, cyclones and corresponding structures, which act to stop non-gaseous components. In a falling-film steam evaporator e.g. of the type described in US patent 3,875,017, precleaned and preheated feed water enters at the top of the device and evaporates traveling as a falling film down the heat transfer surfaces. The product flow thus arrives at the lowermost point of the device, turns 180° and then flows in a spiral pattern upwards, whereby impurities separate by centrifugal force to the periphery of the spiral path and depart, flowing downwards as the pure product flow continues it upward motion. A small volume of water is formed in the bottom section of the device, the impurities thus collecting into that volume. This amount of water, having a certain ratio to the amount of produced steam, exits as a reject stream. For retaining the quality of the produced steam, said ratio must be kept within certain limits. By the s.ame method, distillate may be produced by condensing the product steam to water.
Monitoring of product steam is a way of controlling the proper operation of the device, but such a measurement based on, for example, conductivity, signals a decreasing product steam quality too late. Continuous measurement of the reject water flow is very difficult 2 due to the irregularity of the flow produced by a valve or a moisture trap, and for this reason measurement of reject water has not been practiced earlier in the field of stills or steam generators.
Disclosure of the invention
A method according to claim 1 has now been invented for measuring the amount of reject water from a steam generator or a still, in which two level sensors, provided in the reject water exit tube with a specified vertical distance relative to each other, control a valve arranged below said sensors to effect opening of the valve as the water level reaches the up- per level sensor, .and to effect closing of the valve as the water level reaches the lower level sensor.
A further object of the invention is a device according to claim 2, comprising a non- horizontal reject water exit tube or a branch or vessel connected thereto provided with a first level sensor to indicate a water level reaching said first level sensor, and at a lower level than said first level sensor a second level sensor to indicate a water level reaching said second level sensor, and at a lower level than said second level sensor a valve arranged to open by the signal from the first level sensor, .and to close by the signal from the second level sensor. Preferably, the level sensors are provided in a branch of the exit tube, the lower end of which branch communicates with the exit tube above the valve, while the upper end communicates with the bottom section of the still or steam generator. In principle, the level sensors may be fitted in the exit tube proper, or in any side vessel communicating with the exit tube so as to provide a common water level. The type of level sensor may be swimmer-switch, inductive, or any other type suitable for the conditions, as the person skilled in the art will contemplate.
According to the invention, the ambiguities relating to the measurement of reject water connected with the solutions according to the prior art are avoided. As the volume corresponding to the vertical distance of the level sensors is known, and the rate of opening and closing of the valve is recorded over time, the water flow per unit time can be determined. As the flow rate of feed water is also known, the reject ratio of the still or steam generator is easily calculated by means of control electronics well known to the skilled person. 3
The system may include additional level sensors, for example mounted on a higher level than the aforementioned upper sensor. Such a sensor may provide, for example, a high level alarm indicating malfunction of the sensors below.
Brief description of the drawing
Figure 1 shows a schematic view of a steam generator according to the invention; the generator may constitute part of a still apparatus.
Description of an embodiment The invention is disclosed in greater detail below, with reference to the enclosed drawing. Preheated feed water enters the still or steam generator (1) through line (2) and evaporates in the downflow channels (3), heat being transferred from the heating steam (4). In the bottom section of the device, the flow makes a 180° turn, and is freed of droplets and foreign matter in the upflow channels (6). During operation, a minor volume of water en- riched in impurities is formed in said upflow channel and collects in the bottom section (5) of the device, and exits as a reject stream through line (7).
For measurement of the reject water flow, a branch (8) is provided in line (7), the upper part of which branch communicates with the bottom section of the still or steam generator. As water accumulates in the tubing above closed valve (9) during operation of the still or steam generator, after some time the level reaches level sensor (10). Sensor (10) thereby transmits a signal to the control system, which opens valve (9). Water flows out until the level reaches sensor (11), the signal of which effects the closing of valve (9). The volume of tubing (7,8) corresponding to the vertical distance of level sensors (10,11) is easily determined; as the control electronics monitors the rate of opening of valve (9), the flow rate of reject water is thus defined with sufficient accuracy.
When using the apparatus as a still, the product steam is condensed in condenser (12).

Claims

4Claims
1. A method for measuring the reject water flow rate of a still or steam generator, characterized by controlling, by means of two level sensors provided in the reject water exit tube, or in a branch or vessel communicating therewith, a valve provided at a lower level than said two level sensors, said two level sensors having a specified vertical distance, in such a way that said valve opens as a water level reaches the upper level sensor, and said valve closes as the water level reaches the lower sensor; and that the flow rate is determined from the known volume corresponding to the vertical distance of the sensors and the operating frequency of the valve.
2. A device for measuring the reject water flow rate of a still or steam generator, characterized by comprising a non-horizontal reject water exit tube or a branch or vessel communicating therewith provided with a first level sensor to indicate a water level rising to said first level sensor, and at a level below that of the first sensor a second level sensor to indicate a water level descending to said second level sensor, and at a level below the second level sensor a valve adapted to open by the signal of the first level sensor and to close by the signal of the second level sensor.
PCT/FI1999/000187 1998-03-13 1999-03-12 Method and device for measuring the reject water flow in a steam generator WO1999047854A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU27304/99A AU2730499A (en) 1998-03-13 1999-03-12 Method and device for measuring the reject water flow in a steam generator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI980562 1998-03-13
FI980562A FI980562A (en) 1998-03-13 1998-03-13 Method and apparatus for measuring the wastewater flow from a steam generator or distillator

Publications (1)

Publication Number Publication Date
WO1999047854A1 true WO1999047854A1 (en) 1999-09-23

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AU (1) AU2730499A (en)
FI (1) FI980562A (en)
WO (1) WO1999047854A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019021556A1 (en) * 2017-07-26 2019-01-31 オルガノ株式会社 Water-collection dispenser and correction method therefor
CN113674885A (en) * 2021-06-30 2021-11-19 中国核电工程有限公司 Debugging method for accident discharge pipeline of steam generator blowdown system of pressurized water reactor nuclear power plant

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5961962B2 (en) * 2011-09-28 2016-08-03 三浦工業株式会社 Boiler steam amount measuring method, boiler load analyzing method, boiler steam amount measuring device, and boiler load analyzing device

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125881A (en) * 1964-03-24 Rate of flow meter
US3875017A (en) * 1971-04-22 1975-04-01 Saari R V J Multi-stage thin film evaporator having a helical vapor flow path
DE2554473A1 (en) * 1975-12-04 1977-06-08 Gerdts Gustav F Kg DEVICE FOR MONITORING THE AMOUNT OF A FLOW MEDIUM
US4906165A (en) * 1988-09-09 1990-03-06 Fox Ronald L Flow meter for a positive displacement pump
US5058194A (en) * 1988-01-08 1991-10-15 Societe Cooperative De Production Bourgeois Steam generator for cooking appliances
EP0518788A1 (en) * 1991-06-10 1992-12-16 SOCIETE COOPERATIVE DE PRODUCTION BOURGEOIS (Société Coopérative de Production Anonyme à Capital Variable) Pressure regulated steam generator
GB2286048A (en) * 1994-01-26 1995-08-02 Spirax Sarco Ltd Flow meters
US5511950A (en) * 1994-08-05 1996-04-30 Shin-Ei Kabushiki Kaisha Vacuum pumps for recovering condensates from steam-using apparatus
EP0772000A1 (en) * 1995-10-31 1997-05-07 Seb S.A. Steam generator with automatic feeding and process for measuring liquid level in such a steam generator

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125881A (en) * 1964-03-24 Rate of flow meter
US3875017A (en) * 1971-04-22 1975-04-01 Saari R V J Multi-stage thin film evaporator having a helical vapor flow path
DE2554473A1 (en) * 1975-12-04 1977-06-08 Gerdts Gustav F Kg DEVICE FOR MONITORING THE AMOUNT OF A FLOW MEDIUM
US5058194A (en) * 1988-01-08 1991-10-15 Societe Cooperative De Production Bourgeois Steam generator for cooking appliances
US4906165A (en) * 1988-09-09 1990-03-06 Fox Ronald L Flow meter for a positive displacement pump
EP0518788A1 (en) * 1991-06-10 1992-12-16 SOCIETE COOPERATIVE DE PRODUCTION BOURGEOIS (Société Coopérative de Production Anonyme à Capital Variable) Pressure regulated steam generator
GB2286048A (en) * 1994-01-26 1995-08-02 Spirax Sarco Ltd Flow meters
US5511950A (en) * 1994-08-05 1996-04-30 Shin-Ei Kabushiki Kaisha Vacuum pumps for recovering condensates from steam-using apparatus
EP0772000A1 (en) * 1995-10-31 1997-05-07 Seb S.A. Steam generator with automatic feeding and process for measuring liquid level in such a steam generator

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
DERWENT'S ABSTRACT, No. 86-270323/41, Week 8641; & SU 1211505 A (BELGOROD POWER ENG) 15 February 1986. *
PATENT ABSTRACTS OF JAPAN, Vol. 8, No. 153, (P-287); & JP 59050316 A (MITSUBISHI KASEI KOGYO K.K.) 23 March 1984. *
PATENT ABSTRACTS OF JAPAN, Vol. 8, No. 169, (P-292); & JP 59065218 A (EBARA SEISAKUSHO K.K.) 13 April 1984. *
PATENT ABSTRACTS OF JAPAN; & JP 9085229 A (TOYOBO CO LTD) 31 March 1997. *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019021556A1 (en) * 2017-07-26 2019-01-31 オルガノ株式会社 Water-collection dispenser and correction method therefor
JP2019027822A (en) * 2017-07-26 2019-02-21 オルガノ株式会社 Water sampling dispenser and correction method of the same
CN110914650A (en) * 2017-07-26 2020-03-24 奥加诺株式会社 Water dispenser and calibration method thereof
CN110914650B (en) * 2017-07-26 2020-09-11 奥加诺株式会社 Water dispenser and calibration method thereof
TWI742281B (en) * 2017-07-26 2021-10-11 日商奧璐佳瑙股份有限公司 Water sample dispenser and calibration method thereof
CN113674885A (en) * 2021-06-30 2021-11-19 中国核电工程有限公司 Debugging method for accident discharge pipeline of steam generator blowdown system of pressurized water reactor nuclear power plant

Also Published As

Publication number Publication date
FI980562A0 (en) 1998-03-13
AU2730499A (en) 1999-10-11
FI980562A (en) 1999-09-14

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