• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method and apparatus for controlling the rate at which material is fed to a molten salt bath in a process utilizing the material to produce molten metal. The apparatus includes means for generating a signal that represents the actual level of the salt bath, means for generating a signal representing the density of the salt bath, and means for generating a signal representing the volume of the metal beneath the salt bath. A circuit is provided for receiving and storing an initial datum representing a desired concentration of the material in the molten bath, and for receiving the above signals, the circuit being further capable of calculating a bath level in response to said signals that will maintain the initial percent concentration of the material during the time molten metal is being produced and when molten metal is removed from the bath.
    公开号:SU793411A3
    申请号:SU772509803
    申请日:1977-08-09
    公开日:1980-12-30
    发明作者:Ли Вайт Расселл；Ли Эдвардс Кеннет
    申请人:Алюминум Компани Оф Америка (Фирма)；
    IPC主号:
    专利说明:

    The main unit, the level sensors of the molten salt, the current of the electrolyzer, the heat losses from it, are the heights of the salt bath, as well as the offsets to the inputs of the calculator, the output of which is connected to the input of the regulating unit. The drawing shows a block diagram of a device that implements the proposed method. The control unit comprises a unit for dispensing material into a bath of the electrolyzer, connected with a regulating body 2, a manometric 3 seconds. converter 4 for measuring |} ram and discharge of salt bath 5 current flowing to bus 6, sensors 7 heat flux of heat losses from the electrolyzer to heat exchanger 8, digital computing unit 9, consisting of memory block 10 and arithmetic calculation of data, block 11 form a control signal and a synchronization unit 12 connected to the regulator 2. The method is carried out as follows. The concentration of the material in the salt bath is determined, which is required by the EIT of the efficient operation of the electrolyzer, which is inserted into the memory unit. The level and height of the bath are continuously measured simultaneously and the measurement results are transmitted to the computing unit. The volume of molten metal is determined by measuring the current load and heat loss from the cell. As the metal is formed in the bottom part of the electrolyzer, the signal is fed into the calculator of the lower unit and the level and height of the material in the bath is determined, compared with the given value of your level with the current and provided that the specified value is greater than the current, the material is fed into Batmy the time required to accurately restore the concentration of material in a salt bath. During the manufacture of aluminum from aluminum chloride, a change occurs in the formation of chlorine gas, thereby changing the volume of bubble chlorine, and, consequently, the density of the molten salt, as a result of which the volume and height of the bath change. These values deviate from the predetermined values and, by the values of the deviations, change the flow of material into the bath. The device that implements the method works as follows. A predetermined concentration of the raw material in the salt bath, necessary for the efficient operation of the electrolyzer, is entered into memory block 10 of the computing block 9. The current level or height of the bath is continuously measured by sensor 3, the signal to which goes to converter 4. Formed in a converter the signal goes to the supervisor unit 10 and to the control signal generating unit. During the operation of the electrolytic cell, molten metal is formed in the bottom part of the bath under the salt bath, and when aluminum chloride is used as the raw material, chlorine gas is formed, which can be reused in the production of aluminum chloride. The volume of molten metal is determined by measuring the load of the electrolyzer using a current sensor 5 and measuring the heat loss using the heat flow sensor 7, which determine the temperature of the cooling agent at the inlet and outlet of the heat exchanger 8. The heat loss is determined by the change in temperature difference at a known flow rate cooling agent. A comparative analysis of the total amount of energy supplied to the electrolyzer and measured by sensor 5 and the amount of heat loss allows us to determine using the computing unit 10 the current utilization rate in the electrolyzer and from it determine the amount of metal produced and the amount of change (increase) in the level of metal in the electrolyzer. The following formula is used for the calculation: C.7394-: i, 5 where 0 is the amount of metal, kg; Ots - the amount of metal, pound; 0.7394 - the decimal fraction is derived from Coulomb's law and is the amount of aluminum in pounds obtained from an aluminum compound, such as aluminum halide, at 1000 amps of current per hour through one compartment of the electrolyzer at 100% current utilization rate; the same, kg; J - current value, kA; n is the number of compartments of the electrolyzer; K - the number of hours of operation of the electrolyzer. When a metal is formed at the bottom of the electrolyzer, signals from sensors 3 and 5 arrive at the computing unit, the computer determines the level or height of the material in the bath at a given conceptual fracture, and calculates the voltage for a given value of the bath level, the signal goes to control unit 11, where equals current value. The control unit generates a control signal, which is fed to the input of the synchronization unit 12, controlling the control of the regulating ramp 2. The consumption of material changes to. until the concentration of the material in the salt bath becomes equal to the target. When the material is added, the salt bath rises, the signal from sensor 3 approaches the voltage setpoint received from the computing unit. In the presence of an error signal, the synchronization unit is adjusted according to the proportional and integral control laws. When the amount of chlorine gas changes in the electrolysis unit's van and the height of the bath, the computing unit calculates the change in the given value of the bath level for any change in the rate of chlorine formation. According to the electrical dependencies between the amount of chlorine and the current of the electrolyzer, the computing unit accordingly changes the given value of the bath level. Invention 1. Method of controlling the flow of material into the electrolytic bath, including the dosing of a given amount of raw material into the electrolyzer and the change in the current passing through it, the fact that, in order to improve the performance of the electrolyzer and the quality of the final product, the level and density of the molten salt and the volume of the metal in the electric bath are determined the electrolyzer, the molten sopi density is determined by calculating the chlorine production rate of the electrolyzer, and the molten metal volume from the current and heat losses measured, while the molten salt level and the metal volume in the bath decrease, the raw material is supplied to the bath, by increasing the level of molten salt and the volume of the metal to the specified values, the supply of raw materials is stopped, the specified value is adjusted depending on the density of the salt bath. 2. An apparatus for carrying out the method according to claim 1, comprising a current sensor, a setting device / regulating unit connected through an actuator to a regulating body, characterized in that it is equipped with a salt bath level sensor and setting unit, a unit for comparing the current and set level values, sensor of height and density of molten salt, thermal sensor. losses from the electrolyzer, the concentrator {and metal in the bath, the computing unit, the sensors of the level of molten salt, electrolyzer current, heat losses from it, the height and density of the salt bath, as well as setting devices for the inputs of the computing unit, the output of which is connected to the input of the regulating block. Sources of information taken into account in the examination 1. Pateit USA N 3847761, cl. 204-67, publ. 1972.
    权利要求:
    Claims (2)
    [1]
    Claim
    1. A method of controlling the supply of material to the electrolyzer bath, comprising dosing a predetermined amount of raw material into the electrolyzer and changing the current passing through it, characterized in that, in order to increase the productivity of the electrolyzer and the quality of the final product, the level and density of molten salt 30 are determined and the volume of metal in the bath of the cell, the heat loss of the cell, and the raft
    1 4 the molten salt value is determined by calculating the rate of chlorine formation in the electrolyzer, and the volume of molten metal according to the results of measurements of current and heat loss, with a decrease in the level of molten salt and metal volume in the bath, feed the raw material into the bath, while increasing the level of molten salt and volume metal and a predetermined value, the supply of raw materials is stopped, the set value is adjusted depending on the density of the salt bath.
    [2]
    2. A device for implementing the method according to π. 1, comprising a current sensor, a master, a control unit coupled through an actuator to a regulatory body, characterized in that it is equipped with a salt bath level sensor and master, a current and set level comparison unit, a height and density sensor of molten salt, a thermal sensor, losses from the electrolytic cell, a setter for the concentration of metal in the bath, a computing unit, moreover, sensors for the level of molten salt, current of the electrolyzer, heat losses from it, height and density of the salt bath, and also The sensors are connected to the inputs of the computing unit, the output of which is connected to the input of the control unit.
    类似技术:
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    SU793411A3|1980-12-30|Method and device for material feeding control in electrolyzer bath
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    同族专利:
    公开号 | 公开日
    JPS5653636B2|1981-12-19|
    US4045308A|1977-08-30|
    JPS5357110A|1978-05-24|
    DE2729945A1|1978-05-18|
    DE2729945C2|1983-01-05|
    NL7708044A|1978-05-08|
    RO81214A|1984-01-14|
    RO81214B|1984-01-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3629079A|1968-02-23|1971-12-21|Kaiser Aluminium Chem Corp|Alumina feed control|
    US3622475A|1968-08-21|1971-11-23|Reynolds Metals Co|Reduction cell control system|
    US3632488A|1969-01-23|1972-01-04|Reynolds Metals Co|Reduction cell control system|FR2483965B1|1980-06-06|1984-01-06|Aluminium Grece|
    DE3564825D1|1985-03-18|1988-10-13|Alcan Int Ltd|Controlling alf 3 addition to al reduction cell electrolyte|
    EP0195143B1|1985-03-18|1988-10-26|Alcan International Limited|Controlling aluminium reduction cell operation|
    FR2614320B1|1987-04-21|1989-06-30|Pechiney Aluminium|METHOD AND DEVICE FOR CONTROLLING THE ADDITIONS OF SOLID ELECTROLYSIS IN ELECTROLYSIS TANKS FOR THE PRODUCTION OF ALUMINUM.|
    JPH032707U|1989-05-30|1991-01-11|
    AU2003903150A0|2003-06-20|2003-07-03|Bhp Billiton Innovation Pty Ltd|Electrochemical reduction of metal oxides|
    WO2005031041A1|2003-09-26|2005-04-07|Bhp Billiton Innovation Pty Ltd|Electrochemical reduction of metal oxides|
    US20080047845A1|2003-10-14|2008-02-28|Gregory David Rigby|Electrochemical Reduction of Metal Oxides|
    CN101006204A|2004-06-22|2007-07-25|Bhp比利顿创新公司|Electrochemical reduction of metal oxides|
    BRPI0513992A|2004-07-30|2008-05-20|Bhp Billiton Innovation Pty|process for minimizing re-oxidation of reduced material and process for electrochemical reduction of a metal oxide feedstock|
    CN105624740A|2014-10-30|2016-06-01|宁波创润新材料有限公司|Measuring method|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US05/738,657|US4045308A|1976-11-04|1976-11-04|Bath level set point control in an electrolytic cell and method of operating same|
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