WO2017156645A1 - Système pour l'essai de transmetteurs de consistance - Google Patents

Système pour l'essai de transmetteurs de consistance Download PDF

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Publication number
WO2017156645A1
WO2017156645A1 PCT/CL2017/050015 CL2017050015W WO2017156645A1 WO 2017156645 A1 WO2017156645 A1 WO 2017156645A1 CL 2017050015 W CL2017050015 W CL 2017050015W WO 2017156645 A1 WO2017156645 A1 WO 2017156645A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulp
consistency
flow
transmitter device
transmitters
Prior art date
Application number
PCT/CL2017/050015
Other languages
English (en)
Spanish (es)
Inventor
José Labreano SEPÚLVEDA JÉLVEZ
Armando Nicolás SALAS AZÓCAR
Francisco Hernán CARREÑO ROJAS
Original Assignee
Tecnologías De Aplicación Industrial Y Cia. Limitada
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 Tecnologías De Aplicación Industrial Y Cia. Limitada filed Critical Tecnologías De Aplicación Industrial Y Cia. Limitada
Publication of WO2017156645A1 publication Critical patent/WO2017156645A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/08—Regulating consistency
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/34—Paper
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity

Definitions

  • the present invention relates to a system and method for testing consistency transmitters in cellulose and paper processes.
  • the potential field of application of the present invention is:
  • the tests carried out by the laboratories to determine the value of the consistency of the cellulose pulp are determined by standardized procedures, which are performed by the personnel of laboratory. As this test is carried out through empirical processes, it is subject to many actions and conditions that alter the normal parameters of the sample (volume, type of fiber, etc.), which generates an error associated with each step of the procedure, which varies depending on the operator performing the test. This error generated in the consistency determination procedure is transferred to the consistency transmitters when calibrating them.
  • US 6779377 B2 1 describes a method for calibrating consistency sensors comprising the steps of: providing a plurality of consistency sensors; automatically calibrate said plurality of stock consistency sensors online; obtain stock consistency readings; and determining the actual values of consistency from said stock consistency readings, at least a mass balance and characteristic curves of said plurality of consistency sensors.
  • the problem with this solution is that it requires many consistency transmitters that must be placed in series, resulting in an open process where process properties cannot be controlled.
  • the fragility in the process of determining consistency and the errors associated with the procedure not only affect the frequency with which laboratories They must calibrate the equipment or the range of consistency considered acceptable, but it also directly affects the process and production costs of cellulose, since the production calculation is based on two measurements, volumetric flow and consistency. Additionally, all the chemical dosages necessary to infer certain characteristics in the pulp (bleaches, wet strength, etc.) are based on Production (Kg / ton). The problem arises from the need to have a more precise method to calibrate the consistency transmitters to have reliable instruments while maintaining their accuracy and precision.
  • a consistency transmitter test system was created. This system aims to detect and indicate the error associated with the measurements of the consistency transmitters and provide the necessary information to calibrate them, perform maintenance and indicate the end of their useful life.
  • the consistency transmitters to be analyzed are connected in series with a highly calibrated standard device analyzing both the same pulp, in order to compare the results of the measurements delivered by the consistency transmitters with that of the standard device. By analyzing the information obtained from the comparison between the consistency transmitters and the standard device, it can be determined whether the consistency transmitter should be calibrated, requires replacement of parts or has reached the end of its useful life. At the same time that the state of the consistency transmitters is analyzed, the pulp sample used can be analyzed by the laboratories and thus be able to compare the measurements and Detect the error with which the laboratories are working.
  • the operating frequency of the standard device is much less than the consistency transmitters installed in the process, thus reducing the probability of decalibrating it.
  • Figure 1 represents a schematic diagram of the system and method according to a preferred embodiment of the invention.
  • the present invention relates to a system and method for verifying the operation of a transmission device or pulp consistency transmitters in cellulose and paper processes.
  • Figure 1 represents the system (100) for testing pulp consistency transmitters, according to an embodiment of the invention.
  • the flow of cellulose pulp circulates through all the elements that make up the system (100) in a closed circuit where operating conditions similar to the processes in a production plant are given: pressure, flow, temperature. These variables are controlled as follows:
  • the pressure is controlled by the opening of at least one variable valve (1).
  • the process is implemented by at least one PLC (not shown), which receives the censor from at least one pressure transmitter device (2) that closes the feedback loop.
  • the flow rate is controlled by the variation in the operating speed of at least one drive device (3).
  • the drive device (3) corresponds to a centrifugal pump.
  • the process implemented in the at least one PLC receives the feedback sent by at least one flow transmitting device (4) and thus regulates the voltage output of at least one frequency inverter (not shown in the figure). to keep the selection point (set point) of the drive device (3) entered manually,
  • the temperature of the pulp is controlled by the ignition of at least one heater (5), preferably arranged inside a main tank (6) where the pulp is passed through the process diagram programmed in the PLC Said tank comprises at least one temperature transmitter device (7).
  • the feedback is sent by the temperature transmitter (7) to the PLC.
  • the aforementioned variables are controlled to generate operating conditions similar to those found in a cellulose pulp production process.
  • the pulp consistency measurements made by at least two transmitting devices (8a, 8b) are compared; one as a standard device (8a) and another as a test device (8b), the latter arranged in a test chamber (9).
  • Consistency values are stored in a database and a comparison is made between them.
  • the main tank (6) comprises at least one pulp inlet (6a), through which the pulp that will be circulated through the closed circuit (100) is entered.
  • the main tank (6) further comprises at least one high level switch (6b) and one low level switch (6c), to have control over the level of the pulp inside said main pond (1)
  • the delivery device (3) takes the pulp from the discharge of the main tank (6) and sends it to the test chamber (9), by passing it through the at least one pressure transmitter device (2) the at least one device Pattern (8b) and the at least one flow transmitter device (4). After the test chamber
  • the pulp flow passes through the at least variable valve (1) until it is directed to the main tank (6), thus constituting the closed system.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un système pour vérifier le fonctionnement de dispositif transmetteur ou de transmetteurs de consistance de la pâte dans des procédés de production de cellulose et de papier. Le système de la présente invention est un système fermé et comprend au moins les mesures de consistance de la pâte effectuées par au moins deux dispositifs transmetteurs, un dispositif émetteur fonctionnant comme dispositif modèle et un autre comme dispositif de vérification, ce dernier étant disposé dans une chambre de vérification, les valeurs de consistance étant stockées dans une base de données et une comparaison entre elles étant réalisée. L'invention concerne aussi un procédé associé.
PCT/CL2017/050015 2016-03-14 2017-03-14 Système pour l'essai de transmetteurs de consistance WO2017156645A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201662307870P 2016-03-14 2016-03-14
US62/307,870 2016-03-14

Publications (1)

Publication Number Publication Date
WO2017156645A1 true WO2017156645A1 (fr) 2017-09-21

Family

ID=59850069

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CL2017/050015 WO2017156645A1 (fr) 2016-03-14 2017-03-14 Système pour l'essai de transmetteurs de consistance

Country Status (1)

Country Link
WO (1) WO2017156645A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115277486A (zh) * 2022-08-01 2022-11-01 广域铭岛数字科技有限公司 一种基于工业互联网的自动化测试方法、装置及介质

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5071514A (en) * 1990-12-17 1991-12-10 Francis Systems, Inc. Paper weight sensor with stationary optical sensors calibrated by a scanning sensor
EP0716303A2 (fr) * 1994-12-06 1996-06-12 Electronic Systems S.P.A. Appareil de calibration d'un capteur pour la mesure de la teneur en eau de matériaux en feuilles, en bandes ou en pellicules
US5536942A (en) * 1991-09-12 1996-07-16 Procheck Ab Method and arrangement for determining fibre properties by near-infrared-spectroscopy
US20030019274A1 (en) * 2001-05-04 2003-01-30 Michael Schwarz Method and apparatus for the calibration of fiber stock consistency sensors

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5071514A (en) * 1990-12-17 1991-12-10 Francis Systems, Inc. Paper weight sensor with stationary optical sensors calibrated by a scanning sensor
US5536942A (en) * 1991-09-12 1996-07-16 Procheck Ab Method and arrangement for determining fibre properties by near-infrared-spectroscopy
EP0716303A2 (fr) * 1994-12-06 1996-06-12 Electronic Systems S.P.A. Appareil de calibration d'un capteur pour la mesure de la teneur en eau de matériaux en feuilles, en bandes ou en pellicules
US20030019274A1 (en) * 2001-05-04 2003-01-30 Michael Schwarz Method and apparatus for the calibration of fiber stock consistency sensors

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PULPEYE: "New module from PulpEye for faster calibration of oniine consistency sensors", ARTICULO, 20 June 2016 (2016-06-20), Retrieved from the Internet <URL:http://www.pulpeye.com/2016/06/new-module-from-pulpeye-for-faster-calibration-of-online-consistency-sensors> [retrieved on 20170605] *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115277486A (zh) * 2022-08-01 2022-11-01 广域铭岛数字科技有限公司 一种基于工业互联网的自动化测试方法、装置及介质
CN115277486B (zh) * 2022-08-01 2024-05-07 广域铭岛数字科技有限公司 一种基于工业互联网的自动化测试方法、装置及介质

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