SU821615A1

SU821615A1 - Method of controlling multistage flushing station with drum filters in transient and emergency modes

Info

Publication number: SU821615A1
Application number: SU792777272A
Authority: SU
Inventors: Абрам Мкртычевич Гюсумян; Руслан Иванович Батырев; Николай Иванович Бодриков; Виктор Павлович Мурашко; Владислав Иванович Веденеев
Original assignee: Центральный Научно-Исследовательскийинститут Бумаги
Priority date: 1979-06-28
Filing date: 1979-06-28
Publication date: 1981-04-15

Description

Изобретение относится к устройствам автоматического управления промывными станциями с барабанными фильтрами и предназначено для использования в целлюлозно-бумажной^ химической и других отраслях промышленности, где процесс промывки материала осу* ⁵ществляется непрерывно по принципу противотока на нескольких последовательно работающих фильтрах, содержащих большое количество механизмов, а процесс длительное время находится в переходных режимах и зависит от многих технологических параметров, таких как уровни промываемого материала в ваннах фильтров и фильтратов в фильтратных баках и др.The invention relates to automatic control devices for washing stations with drum filters and is intended for use in pulp and paper ^ chemical and other industries, where the process of washing material osu * ⁵ is carried out continuously by the principle of counterflow on several sequentially working filters containing a large number of mechanisms, and the process is in transient conditions for a long time and depends on many technological parameters, such as levels of material being washed baths filtered and the filtrate in the filtrate tanks and others.

Известно устройство управления механизмами промывной станции с барабанными вакуум-фильтра ми, содержащее блок управления станцией и блоки управления механизмами ее ступеней с элементами пуска, останова и сигнализации., измерители уровня суспензии в ванных фильтров и фильтрата в фильтратных баках всех ступеней, измерители перепада давления на фильтрующем основании фильтров, измеритель расхода суспензии с соответствующими сигнализаторами номинальных и минимально допустимых значений этих параметров [ 11.A device for controlling the mechanisms of a washing station with drum vacuum filters is known, which contains a control unit for the station and control units for the mechanisms of its stages with start, stop and signaling elements, suspension level meters in bathtub filters and filtrate in leachate tanks of all stages, differential pressure meters the filtering base of the filters, a suspension flow meter with appropriate signaling devices of nominal and minimum permissible values of these parameters [11.

Недостатком указанного устройства является то, что все механизмы промывной станции включаются и отключаются одновременно без учета необходимости их включения и отключения в определенном порядке в зависимости от состояния оборудования. Это приводит к удлинению времени переходных процессов при пуске станции и к возникновению аварийных ситуаций. Кроме того при пускё и останове станции не учитывается уровень технологических параметров, что, в свою очередь, является существенной помехой для осуществления безаварийного и быстрого пуска и останова всей станции.The disadvantage of this device is that all the mechanisms of the washing station are turned on and off simultaneously, without taking into account the need to turn them on and off in a certain order, depending on the condition of the equipment. This leads to an increase in the time of transients during the start-up of the station and to emergency situations. In addition, when starting and stopping the station, the level of technological parameters is not taken into account, which, in turn, is a significant obstacle to the implementation of trouble-free and quick start and stop of the entire station.

Цель изобретения - повышение надежности управления.The purpose of the invention is to increase the reliability of management.

Указанная цель достигается тем, что устройство для управления многоступенчатой промыв ной станцией с барабанными фильтрами в переходных и аварийных режимах, преимущсст венно для промывки целлюлозы, содержащее блок управления станцией и блоки управления механизмами ее ступеней с элементами пуска, останова и сигнализации, измерители уровня суспензии в ваннах фильтров, фильтрата в фильтратных баках, перепада давления на фильтрующем основании фильтров, расхода суспензии с сигнализаторами номинальных и минимально допустимых значений измеряемых параметров в каждой ступени, имеет в каждой ступени промывной станции реле времени пуска и останова и элементы И и ИЛИ, причем в каждой ступени выходы каждого реле времени соединены с входами блока управления механизмами этой ступени, выход которого соединен с одним из входов элементов И и ИЛИ этой же ступени, другой вход элемента И соединен с одними выходами сигнализаторов номинальных и минимально допустимых значений измеряемых параметров, а другой 'вход элемента ИЛИ связан с другими выходами сигнализаторов этой ступени, выход элемента ИЛИ каждой ступени соединен с входом реле времени останова последующей ступени, при этом выход элемента ИЛИ последней ступени связан с одним из входов блока управления станцией, со вторым входом которого связан выход элемента И первой ступени, выходы элементов И каждой: ' из последующих ступеней соединены с входами реле времени пуска предыдущей ступени, первый выход блока управления станцией соединен с реле времени пуска последней ступени, а второй выход с входом реле времени останова первой ступени.This goal is achieved by the fact that a device for controlling a multi-stage washing station with drum filters in transient and emergency conditions, mainly for washing pulp, containing a station control unit and control units for its stage mechanisms with start, stop and signaling elements, suspension level meters in baths of filters, filtrate in leachate tanks, differential pressure on the filtering base of filters, suspension flow rate with signaling devices of nominal and minimum permissible values The measured parameters in each stage, in each stage of the washing station, have start and stop time switches and AND and OR elements, and in each stage the outputs of each time relay are connected to the inputs of the control unit of the mechanisms of this stage, the output of which is connected to one of the inputs of the elements AND and OR of the same stage, another input of the AND element is connected to one output of the signaling devices of the nominal and minimum permissible values of the measured parameters, and the other 'input of the OR element is connected to other outputs of the signaling devices of this stage, the output is The OR element of each stage is connected to the input of the stop relay of the next stage, while the output of the OR element of the last stage is connected to one of the inputs of the station control unit, the output of the And element of the first stage is connected to the second input, the outputs of the And elements of each: with the inputs of the start time relay of the previous stage, the first output of the station control unit is connected to the start time relay of the last stage, and the second output with the input of the stop time relay of the first stage.

На чертеже схематически представлена трехступенчатая промывная станция с барабанными фильтрами.The drawing schematically shows a three-stage washing station with drum filters.

Промывная станция включает три барабанных фильтра 1, три ванны 2 фильтров, три фильтратных бака 3 и приводы 4 механизмов.The washing station includes three drum filters 1, three baths 2 filters, three leachate tanks 3 and drives 4 mechanisms.

Предлагаемое устройство управления содержит блок 5 управления станцией, блоки 6 управления механизмами ее ступеней с элементами пуска, останова и сигнализации (элементы пуска, останова и сигнализации на чертеже не •показаны).The proposed control device comprises a station control unit 5, control units 6 of the mechanisms of its stages with start, stop and alarm elements (start, stop and alarm elements are not shown in the drawing).

На трубопроводе подачи суспензии на промывную станцию установлен расходомер 7. В ваннах 2 фильтров и фильтратных баках 3 установлены измерители 8 уровня. Перепады давления в барабанных фильтрах определяются с помощью измерителей 9. Измерители 7< 8 и 9 технологических параметров соединены с сигнализаторами 10 их поминальных и минимально допустимых значений.A flow meter 7 is installed on the slurry supply pipeline to the washing station. Level 8 meters are installed in the baths of the 2 filters and the filtrate tanks 3. The pressure drops in the drum filters are determined using meters 9. Meters 7 <8 and 9 process parameters are connected to the signaling devices 10 of their funeral and minimum permissible values.

Устройство имеет реле 11 времени пуска и реле 12 времени останова, элементы И и элементы ИЛИ. При этом выходы реле 11 и 12 соединены с входами блоков 6 управления механизмами, а выходы последних - с входами элементов И и ИЛИ соответствующих ступеней.The device has a start time relay 11 and a stop time relay 12, AND elements and OR elements. In this case, the relay outputs 11 and 12 are connected to the inputs of the mechanisms control units 6, and the outputs of the latter are connected to the inputs of the AND and OR elements of the corresponding steps.

Выход элемента И первой ступени соединен с первым входом блока 5 управления станцией, а выходы элементов И каждой последующей ступени связаны с входами реле 11 времени пуска предыдущих ступеней. Выходы элементов ИЛИ .каждой ступени станции соединены с входами реле 12 времени останова последующих ступеней, причем выход элемента ИЛИ последней ступени соединен со вторым входом блока 5 управления станцией. Первый выход блока 5 соединен с входом реле 11 времени пуска последней ступени станции.The output of the And element of the first stage is connected to the first input of the station control unit 5, and the outputs of the And elements of each subsequent stage are connected to the inputs of the start time relay 11 of the previous stages. The outputs of the OR elements of each stage of the station are connected to the inputs of the relay 12 stop time of the next stages, and the output of the OR element of the last stage is connected to the second input of the station control unit 5. The first output of block 5 is connected to the input of the relay 11 of the start time of the last stage of the station.

Второй выход блока 5 управления соединен с входом реле 12 времени останова первой ступени. Кроме того выходы сигнализаторов 10 номинальных значений технологических параметров соединены с входами элементов И, а выходы сигнализаторов 10 минимально допустимых значений - с входами элементов ИЛИ соответствующих ступеней станции.The second output of the control unit 5 is connected to the input of the relay 12 stop time of the first stage. In addition, the outputs of the signaling devices 10 of the nominal values of the technological parameters are connected to the inputs of the AND elements, and the outputs of the signaling devices 10 of the minimum permissible values are connected to the inputs of the OR elements of the corresponding steps of the station.

Устройство обеспечивает управление станцией в трех режимах: пуск станции, плановый останов и аварийный останов.The device provides station control in three modes: station start, scheduled stop and emergency stop.

Режим пуска. С элемента пуска блока 5 управления станцией поступает сигнал на включение реле 11 времени пуска третьей ступени. При соответствии технологических параметров номинальным значениям и в зависимости от состояния механизмов третьей ступени реле 11 времени пуска осуществляет через блок 6 управления механизмами третьей ступени последовательный пуск этих механизмов. После включения механизмов третьей, ступени срабатывает элемент И третьей ступени, который включает реле 11 времени пуска, второй ступени. Запуск второй, а затем и первой ступени осуществляется аналогично пуску третьей ступени. После включения всех ступеней станции срабатывает элемент И первой ступени, который подает сигнал на элемент сигнализации пуска блока 5 управления станцией.Start mode. From the start-up element of the station control unit 5, a signal is sent to activate the relay 11 of the start time of the third stage. When the technological parameters correspond to the nominal values and depending on the state of the mechanisms of the third stage, the start time relay 11 carries out sequential start of these mechanisms through the control unit 6 of the third stage mechanisms. After switching on the mechanisms of the third, stage, the And element of the third stage is activated, which includes a relay 11 of the start time, of the second stage. The launch of the second, and then the first stage is carried out similarly to the start of the third stage. After switching on all the stages of the station, the And element of the first stage is triggered, which sends a signal to the start signaling element of the station control unit 5.

Режим планового останова. При поступлении сигнала останова станции с элемента останова блока 5 управления станцией поступает сигнал на включение реле 12 времени останова первой ступени станции, которое в последовательности, установленной технологическим регламентом, через блок 6 управления механизмами первой ступени производит их останов. После останова механизмов первой ступени срабатывает элемент ИЛИ первой ступени, который подает сигнал на включение реле 12 времени останова второй ступени стангщи. Останов второй и третьей ступени осуществляется аналогично останову первой ступени. После останова ме5 821615 ханизмов всех ступеней с элемента ИЛИ последней ступени подается сигнал на элемент сигнализации останова станции блока 5 управления.Scheduled Stop Mode. When a station stop signal is received from a stop element of the station control unit 5, a signal is sent to turn on the stop relay 12 of the first stage of the station, which, in the sequence established by the technological procedure, stops them through the block 6 of the first stage mechanisms. After stopping the mechanisms of the first stage, the OR element of the first stage is triggered, which sends a signal to turn on the relay 12 of the stop time of the second stage of the stang. The stop of the second and third stages is carried out similarly to the stop of the first stage. After stopping me5 821615 of all stages of the OR element of the last stage, a signal is sent to the stop signal element of the station of control unit 5.

Режим аварийного останова. При выходе из строя любого Из механизмов какой-либо ступени станции или при отклонении ниже допустимых значений любого технологического параметра (из числа контролируемых измерителями 7, 8 и 9) срабатывает элемент ИЛИ соответствующей ступени, который подает сиг-. нал на отключение механизмов последующих ступеней в той последовательности, которая описана в режиме планового останова станции.Emergency stop mode. If any of the mechanisms of any stage of the station fails, or if the deviation is below the permissible values of any technological parameter (from the number controlled by meters 7, 8 and 9), the OR element of the corresponding stage is triggered, which sends a signal. cash for disabling the mechanisms of subsequent stages in the sequence described in the scheduled shutdown mode of the station.

Предлагаемое устройство обеспечивает повышение надежности управления промывной станции, что достигается включением в устройство элементов, позволяющих осуществить последовательный пуск по заданному технологичес-, кому регламенту. При этом учитывается уровень технологических параметров и состояние механизмов станции, что позволяет исключить аварийные ситуации и повысить надежность управления. Кроме того устройство обеспечивает сокращение времени переходных процессов и времени вывода промывной станции на оптимальный режим работы за счет исключения субъективных факторов, имеющих место в процессе ручного управления.The proposed device provides increased reliability of the control of the washing station, which is achieved by the inclusion in the device of elements that allow for sequential start-up according to a given technological regulation. At the same time, the level of technological parameters and the state of the station's mechanisms are taken into account, which eliminates emergency situations and improves the reliability of control. In addition, the device provides a reduction in the time of transient processes and the time of the output of the washing station to the optimal operating mode due to the exclusion of subjective factors that occur in the process of manual control.

Claims

3 for washing the pulp, containing the station control unit and the unit controlling the mechanisms of its stages with the elements of start and stop signaling, measuring the level of suspension in the baths of filters, filtrate in the filtrate tanks, pressure difference on the filtering base of filters, the flow rate of the suspension with nominal and minimum permissible alarms the values of the measured parameters in each stage, has in each stage of the washing station of the relay no start and stop times and elements AND and OR, and in each stage the outputs of each relay The time is connected to the inputs of the control unit for the mechanisms of this stage, whose output is connected to one of the inputs of the AND and OR elements of the same stage, the other input of the AND element is connected to one output of the signaling devices of nominal and minimum acceptable values of the measured parameters, and the other input of the OR element is connected the other outputs of the signaling devices of this stage, the output of the OR element of each stage is connected to the input of the relay relay of the next stage, and the output of the OR element of the last stage is connected to one of the inputs of the unit ION station, to the second input of which is coupled the output of AND ne howling stage, and each element outputs; of the subsequent stages are connected to the inputs of the start-up time relay, the first output of the control unit is connected to the start-up time relay of the last stage, and the second output is connected to the input of the first-stage stop relay. The drawing shows schematically a three-stage washing station with drum filters. The washing station includes three drum filters 1, three baths of 2 filters, three filtrate tanks 3 and drives of 4 mechanisms. The proposed control unit comprises a stanple unit control unit 5, a control unit 6 for controlling the mechanisms of its steps with start, stop and alarm elements (start, stop and alarm elements are not shown in the drawing). On the supply line of the suspension to the washing station, there is a ram; a water meter 7. There are 8 level meters in the baths of 2 filters and 3 tank tanks. The pressure drops in the drum filters 1X are determined with the help of meters 9. Measuring devices 7 8 n 9 process parameters are connected to the signaling devices 10 of their memorial values and the minimum allowable values. The device has a relay start time relay 11, stop time relay 12, AND elements and elements OR. In this case, the outputs of the relay 11 and 12 are connected to the inputs of the blocks 6 for controlling the mechanisms, and the outputs of the latter are connected to the inputs of the AND and OR elements of the corresponding stages. The output of the element And the first stage is connected to the first input of the control unit 5 of the station, and the outputs of the elements AND of each subsequent stage are connected to the inputs of the relay II of the start time of the previous stages. The outputs of the OR elements. Each stage of the station is connected to the inputs of the relay 12 of the stop time of the subsequent stages, and the output of the OR element of the last stage is connected to the second input of the station control unit 5. The first output of block 5 is connected to the input of the relay 11 of the start time of the last stage of the station. The second output of the control unit 5 is connected to the input of the relay 12 of the stop time of the first stage. In addition, the outputs of the detectors 10 nominal values of the technological parameters are connected to the inputs of the elements And, and the outputs of the detectors 10 minimum allowable values - with the inputs of the elements OR of the corresponding stages of the station. The device provides control of the station in three modes; station start, planned stop and emergency stop. Start mode From the start element of the station control unit 5, a signal is received to turn on the relay 11 of the start time of the third stage. When the technological parameters correspond to the nominal values and depending on the state of the third-stage mechanisms, the start-up time relay 11, through the third-stage mechanisms control unit 6, performs a successive nyqK of these mechanisms. After switching on the mechanisms of the third stage, the element AND of the third stage is triggered, which turns on the relay 11 of the start time, the second stage. The start of the second, and then the first STZ shadow is carried out similarly to the start of the third stage. After switching on all the steps of the station, the element And of the first step is triggered, which sends a signal to the start alarm element of the station control unit 5. Planned stop mode. When a station stop signal is received from the stop element of the control unit 5, the signal is sent to turn on the first stage station stop relay 12, which, in the sequence established by the process schedule, stops them through the first stage mechanism control unit 6. After stopping the mechanisms of the first stage, the element OR of the first stage is activated, which sends a signal to activate the relay 12 of the second stage stop time CTBHIUW. The second and third stages are stopped in the same way as the first stages. After the mechanisms of all stages are stopped, the element OR of the last stage is given a signal to the element of the stop station stop of the control unit 5. Emergency stop mode. When any of the mechanisms of a station stage fails or if any technological parameter deviates below the allowable values (from among the monitored meters 7, 8 and 9), an OR element of the corresponding stage is triggered, which gives a signal to turn off the mechanisms of subsequent stages the sequence described in the station’s planned shutdown mode. The proposed device provides an increase in the reliability of control of the washing station, which is achieved by including in the device elements that allow sequential start-up according to a given process schedule. This takes into account the level of technological parameters and the state of the mechanisms of the station, which eliminates emergency situations and increases the reliability of pickling. In addition, the device provides a reduction in the time of transient processes and the time taken to bring the washing station to the optimum operating mode by eliminating the subjective factors that occur during the manual control process. Apparatus of the Invention A device for controlling a multi-stage washing station with drum filters in transient and emergency conditions, mainly for washing the pulp, comprising a station control unit and a control unit for its stage mechanisms with start, stop and signaling automation elements, and measuring the level of suspension in filter baths , filtrate in fi tanks, pressure drop on filter base of filters, suspension flow rate with signaling devices of nominal and minimum allowable values of measured pairs meters in each stage, characterized in that, in order to increase the reliability of control, it has in each stage of the washing station a start and stop time relay and AND and OR elements, in each stage, the outputs of each time relay are connected to the inputs of the control unit for the mechanisms of this stage , the output of which is connected to one of the inputs of the AND and OR elements of the same rotary level, the other input of the AND element is connected to one of the outputs of the signal transmitters of nominal and minimum acceptable values of the measured parameters, and the other input of the element OR connection With the other outputs of the detectors of this stage, the output of the OR element of each stage is connected to the input of the downstream time relay relay, while the output of the W | AND last stage element is connected to one of the inputs of the station control unit, the second input of which is connected to the output of the AND element the first stage, the outputs of the elements And each of the subsequent stages are connected to the inputs of the start time relay of the previous stage, the first output of the station control unit is connected to the start time relay of the last stage, and the second output with the input of the relay time Yeni stop the first stage. Sources of information taken into account in the examination 1. Technical design of the All-Union Scientific Research and Design and Technological Institute of Chemical Engineering VNII PTHIMMASH, Penza, topic number 602 -P, index 794185 RPP, 1965.