The process control method of the vacuum separation of titanium sponge

 

(57) Abstract:

The invention relates to ferrous metallurgy, in particular to methods of cleaning sponge titanium vacuum separation. The technical result is to increase productivity and reduce energy consumption by improving the quality of regulation of the temperature in the heating zone of the apparatus during the time of conducting the separation process. The technical result is achieved due to the fact that in the process control method of the vacuum separation of titanium sponge in devices with multi-zone heating the reaction mass is heated the reaction mass, compare the signals of the sensors with the set for each heating zone values. Keep the temperature in each zone of the device controller by changing the input power on and off of the heater. Measure the current values of the output signals of the temperature controllers of these heating zones, control of the process steps on the current values of the output signals of the temperature controllers. Before beginning the process set tuning parameters of the temperature of each heating zone. In the course of the process according to the results of the comparison signals of the temperature sensors and the motion of each heating zone of the apparatus is proportional to the magnitude of the current values of the output signals of the respective temperature controllers. 1 Il.

The invention relates to ferrous metallurgy, in particular, to methods of cleaning sponge titanium vacuum separatea and process control vacuum separatsii sponge titanium.

A known method of controlling the separation process, based on the temperature in the heating zone of the apparatus multichannel rector of the machine centralized control (ICC) with simultaneous measurement of vacuum in the separation apparatus to control the duration and the end of the separation process (see Use of electronic machine centralized control in the production of titanium sponge.- Proceedings of Giredmet. - M.: metallurgy, 1966, volume 15, S. 104-112.). A way to centrally manage the separation process provides quality titanium sponge and reducing the cost of operation of automation systems.

The disadvantage of this method is that the vacuum in the apparatus is a random variable that depends on the operation of vacuum equipment and the tightness of the separation apparatus, and does not characterize uniquely the state of the separation process. This leads to an unjustified increase in the duration of the separation, resulting in reduced productivity of the process is that titanium (RF patent N 1797288), including the measurement of the power consumed by each heating zone of the apparatus, and the temperature in these zones by changes within a given cycle duty cycle switch-on pulses to the heaters on the outputs of the temperature controllers inversely proportional to the average values for a given time interval values of the power consumption of the heating zones. The method allows to improve the quality of regulation of the temperature in the heating zone of the apparatus and to improve the performance of the device and to reduce energy consumption.

The disadvantage of this method of control is that the measured process temperature control the power consumed by the heating zones, averaged over long time intervals that do not allows to control the duration and the end of the process, resulting in reduced performance of the device and increases energy consumption. In addition, to measure the power consumption required additional instrumentation, which complicates the control system.

There is a method of process control vacuum separation of titanium sponge (Art. Principles duplex ACS processes the CE is th mass, comprising heating the reaction mixture, maintaining the temperature in each zone of the apparatus by changing the input power on and off of the heater, measuring current values of the output signals of the temperature controllers of these heating zones, the control stages of the separation process on the current values of the output signals of the temperature controllers.

For carrying out the separation process carried out preliminary heating of the reaction mass to a predetermined temperature of the heating zone of the apparatus. Set temperature in the zones of the apparatus by evaporation of the reaction mixture of magnesium and magnesium chloride supports mnogokanalnyy encoder (machine centralized control center) by changing the applied heating power regulatory influences on and off the heaters of the respective zones of the device separation. However, if the temperature in the heating zone exceeds the specified value, the multi-channel controller disables the corresponding heater. If the temperature is below the setpoint controller includes corresponding heater heating zone. The outputs of the multichannel controller measure the current values of the time on and off nagrevatelej distillation from the reaction mass the main quantity of the magnesium and magnesium chloride, heating the reaction mass to the maximum temperature with evaporation of the remaining quantities of magnesium and magnesium chloride. The control process steps can improve process performance and reduce energy costs due to more accurate determination of the end of the separation.

However, this management process in the heating zone of the apparatus leads to significant temperature fluctuations. Due to poor quality control is necessary to reduce the set temperature of the heating zone of the apparatus to prevent the formation of eutectic iron-titanium, which reduces the efficiency of the process and increases the energy consumption.

The task of the invention is to improve process performance and reduce energy consumption by improving the quality of temperature control in the heating zone of the apparatus during the time of conducting the separation process.

The problem is solved so that the process control method of the vacuum separation of titanium sponge in devices with multi-zone heating the reaction mass comprising heating the reaction mass, the comparison of the signals of the sensors with the set for each heating zone values, maintaining the temperature I measuring the current values of the output signals of the temperature controllers of these heating zones, the control process steps according to the current values of the output signals of the temperature controllers, the new is the fact that before the beginning of the process set tuning parameters of the temperature of each heating zone, in the course of the process according to the results of the comparison signals of the temperature sensors and the set values generate a continuous output signals of the temperature controllers and change the applied heating power of each of the zones of the apparatus is proportional to the magnitude of the current values of the output signals of the respective temperature controllers.

When conducting the regulatory process by comparing a fly parameters with the signals of the temperature sensors forming a continuous output signals temperature control and change input heating power of each of the zones of the apparatus is proportional to the magnitude of the current values of the output signals of the respective temperature controllers, reduced fluctuation of temperature in the heating zone of the apparatus, which allows to increase the set temperature of the heating zone of the apparatus to 1030oC and thereby improve the efficiency of the process senices sources of information, and identification of sources containing information about the equivalents of the claimed invention, has allowed to establish that the applicant had not found the source, which is characterized by signs, identical all the essential features of the invention. The definition from the list of identified unique prototype, as the most similar set of features analogue, has allowed to establish the essential towards perceived by the applicant technical result of the distinctive features in the proposed method, set forth in the claims.

Therefore, the claimed invention meets the condition of "novelty."

To verify compliance of the claimed invention the term "inventive step", the applicant conducted an additional search of the known solutions to identify signs that match the distinctive features of the prototype of the characteristics of the claimed method. The search results showed that the claimed invention not apparent to the expert in the obvious way from the prior art because the prior art defined by the applicant, not the influence provided the essential features of the claimed invention transformations to achieve the level".

This invention is illustrated in the diagram of the control apparatus of the vacuum separation of titanium sponge with a three-zone heating the reaction mass. The unit comprises of the retort 1 with the reaction mass, the retort-condenser 2, the electric furnace 3 with a chromel-alyuminevyemi thermocouples 4 and nichrome heaters 5 installed in the heating zones of the retort 1; a microprocessor controller 6, consisting of 7 blocks amplification of the signals of thermocouples, algoblock 8 - throttling "analog" with the given values 9 temperature (set point), algoblock 10"impulsora", algoblock 11 - track - remembering"; the personal computer 12, which consists of a system unit 13 and display 14; intermediate relay 15 with Executive contacts 16; power thyristors 17, in the chain of control electrodes which included Executive contacts 16, the devices 18 for measuring the applied heating power; source 19 power supply of the heating zones; 20 gauge vacuum; secondary device 21 vacuum control, vacuum pumps 22. As microprocessor-based controller used microprocessor controller REMIKONT P-130. Algoblock 8 contain the PID controllers, algoblock 10 - pulse - width modulator with a preset period and changing the output signals of algoblock 8 and signals of the temperature in the heating zones on the outputs of the blocks 7. (See technical details manufacturer "Prompribor" AA. 399.550.TO1, parts 1, 2 Controllers low-channel, multi-function, microprocessor RAMICONE P-130", Cheboksary, 1993. S. 66-73, S. 199-202, S. 213-215). As power thyristors 17 - thyristors T-series-143-500, as instruments 18 - three-phase active energy meter type SAZ-AND:87. The degassing apparatus separation was performed by two vacuum pumps 22: pre-pump vacuum BH-6 and booster pump bn-2000. As the sensor 20 of the control vacuum in the apparatus used thermocouple Converter PMT-2, as the device 21 - gauge thermocouple W-2A.

Before beginning the process in algoblock 8 enter preset values 9 the temperature of the heating zones equal to 1030oC, and a fly parameters: integration time of 1 minute, the coefficient of proportionality 40. In algoblock 10 enter specified periods of pulses equal to 1 minute. The power of the heater in each zone of the apparatus is equal to 130 kW.

An example of the method.

The separation apparatus is installed in the electric furnace 3, serves the voltage on the heaters 5, include a microprocessor controller 6, the vacuum pump 22, the devices 18, 20 and 21 and begin the process JEPs is which condense in the retort-condenser 2. Measured by thermocouple 4, the temperature signals are amplified by respective blocks 7 are compared with preset values of 9, and the results of the comparisons are converted by Algologie 8 output signals in accordance with the PID algorithm. Algoblock 10 converts the current values of the output signals of algoblock 8 into a sequence of pulses, the repetition period of which is equal to 1 minute, and the duration of the pulses is proportional to the magnitude of the current values of the output signals of the respective algoblock 8. Impulses to the intermediate relay 15, which, including turning off the contacts 16 of the power thyristors 17, change the duty cycle of the switching on of the heater 5 to the source 19 of the power supply and, respectively, summing the current values of the output signals of the respective algoblock 8 controlled devices 18. Algoblock 11 perform tracking and storing the signals of the temperature in the heating zone of the apparatus and the current values of the output signals of algoblock 8. Unit 13 measures these signals and measurement results are displayed on the monitor 14, where the current values of the output signals of algoblock 8 control stage of the separation process. At the stage of heating temperature in zone heating power is maximum and equal to 130 kW. At the stage of intensive distillation, the main quantity of the magnesium and magnesium chloride, the temperature in the heating zones maintained at 1030oC, while the current values of the output signals of algoblock 8 gradually decrease and reach the end of the stage in the upper zone (located near the retort-condenser 2) 53%, in the middle and lower areas, respectively, 12% and 10%. Applied to the zones of the heating power is reduced in proportion to the values of the current values of the output signals of algoblock 8 and reaches the end stage of intensive distillation in the upper, middle and lower zones, respectively, 68,9, 15.6 and 14 kW. During the subsequent stage of prosea the reaction mass by evaporation of the remaining quantities of magnesium and magnesium chloride current values of the output signals of algoblock 8 remain almost constant at the levels 53,12 and 10% achieved at the end stage of intensive distillation. Respectively supplied to the heating zones power is also saved on the levels 68,9, 15.6 and 13 kW.

Thus, the proposed method allows without compromising quality titanium sponge to increase the set temperature of the heating zone of the apparatus 1000oC to 1030oC, resulting in the performance of the process according to the ow in the heating zone of the apparatus of the separation.

The process control method of the vacuum separation of titanium sponge in devices with multi-zone heating the reaction mass comprising heating the reaction mass, the comparison of the signals of the sensors with the set for each heating zone values, the temperature in each heating zone of the apparatus controller by changing the input power on and off of the heater, measuring current values of the output signals of the temperature controllers of these heating zones, the control process steps on the current values of the output signals of the temperature controllers, characterized in that before starting the process set tuning parameters of the temperature of each heating zone, in the course of the process according to the results of the comparison signals of the temperature sensors and the set values generate a continuous output signals of the temperature controllers and change the applied heating power of each of the zones of the apparatus is proportional to the magnitude of the current values of the output signals of the respective temperature controllers.

 

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