CN103838188A - UF6 vaporization automatic control system and control method thereof - Google Patents
UF6 vaporization automatic control system and control method thereof Download PDFInfo
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Abstract
The invention, which belongs to the technical field of automatic controlling, particularly relates to a UF6 vaporization automatic control system and a control method thereof. A DCS control system of the system is composed of a material holding container internal pressure transmitter, a material holding container outer-wall temperature transmitter, a gas-guide tube temperature transmitter, a current transmitter, an analog-to-digital conversion module, a PID pressure regulator, a program setting device, a sequence controller, a conversion controller, a PID temperature regulator A, a PID temperature regulator B, a protection linkage controller, a digital-to-analog conversion module, a switching value output module, a heating controller, and a heater. And a PLC control system of the system includes a vaporization tank internal pressure transmitter, a doorseal pressure transmitter, a PLC analog input module, a PLC controller, a graphic operation terminal, and an output controller. The DCS control system is used for realizing continuous automatic control and protection of the internal pressure and the wall temperature of the material holding container as well as continuous and automatic control and protection of the gas-guide tube temperature and the heater current; and the PLC control system is used for realizing automatic control and protection of the internal pressure and the doorseal pressure of the vaporization tank.
Description
Technical field
The invention belongs to automatic control control technology field, be specifically related to a kind of UF
6vaporization automatic control system and control method.
Background technology
The vaporization of UF6 is the first operation that wet method or dry process can sintering powder of uranium dioxide, its technological process is as follows: the container that fills UF6 material is vaporized in gasifying pot, the well heater of gasifying pot is positioned at its afterbody, the heat that electrocaloric effect produces brushes even action by axial flow blower and is diffused into charge cask around, makes its thermally equivalent from outside to inside.Along with the carrying out of heating, the temperature of container progressively raises, the expansion that progressively heats up of its inner UF6 material, and container internal pressure is progressively changed to malleation by negative pressure.When temperature arrives after sublimation point, the vaporization that progressively distils of UF6 material, As time goes on, the UF6 material of vaporization progressively increases, and container internal pressure further increases.In the time that needs are hydrolyzed reaction, open the valve of giving vent to anger, the UF6 gas in container accompanies hot wireway after the surge tank buffering voltage stabilizing of heat insulation work case inside, to enter next step hydrolyzing process by having.
In the vaporescence of UF6, important control parameter is mainly temperature and pressure, temperature control parameter comprises the contents such as the outside wall temperature of charge cask in two gasifying pots, two wireway temperature, heat insulation work case temperature, and pressure controling parameter comprises in two gasifying pots the contents such as charge cask internal pressure, two gasifying pot internal pressures and two gasifying pot door seal pressure.
In vaporization process, originally adopting process personnel's manual operations always controls with DCS the control mode combining.Only there are several parameters such as surface temperature, heat insulation work case temperature of charge cask in gasifying pot to adopt DCS automatically to control.Other parameter adopts backward manual control substantially.In production run, technologist needs charge cask internal pressure, gasifying pot internal pressure and gasifying pot door seal pressure in manual control gasifying pot, and not only automaticity is low, control accuracy is low, and especially safe reliability is low.In addition, the temperature control of wireway adopts the field instrument position formula control mode falling behind, and departure is large, and well heater is short serviceable life.
Summary of the invention
The object of the present invention is to provide a kind of UF6 vaporization automatic control system and control method, fundamentally to improve the automaticity of UF6 vaporization process, guarantee security and stability, overcome the deficiency that above-mentioned prior art exists.
For achieving the above object, the technical solution used in the present invention is:
A kind of UF
6vaporization automatic control system, comprises DCS control system and PLC control system, DCS control system comprises charge cask internal pressure transmitter, charge cask outside wall temperature transmitter, wireway temperature transmitter, current transducer A, current transducer B, analog-to-digital conversion module A, analog-to-digital conversion module B, analog-to-digital conversion module C, analog-to-digital conversion module D, analog-to-digital conversion module E, PID pressure governor, program set station, sequence controller, switching controller, PID temperature regulator A, PID temperature regulator B, protect chain controller B, D/A converter module A, D/A converter module B, switching value output module B, heating controller A, heating controller B, well heater A, well heater B, PLC control system comprises gasifying pot internal pressure transmitter, door seal pressure unit, PLC analog input module, PLC controller, graphic operation terminal, o controller,
After system operation, described charge cask internal pressure transmitter sends the internal pressure simulating signal of the charge cask collecting to analog-to-digital conversion module A, analog-to-digital conversion module A converts the internal pressure simulating signal of charge cask to digital signal and sends PID pressure governor to, PID pressure governor according to the deviation between the digital signal and the setting value that receive through PID computing output regulation signal to switching controller; Charge cask outside wall temperature transmitter sends the outside wall temperature simulating signal of the charge cask collecting to analog-to-digital conversion module B simultaneously, and analog-to-digital conversion module B converts the outside wall temperature simulating signal of charge cask to digital signal and sends PID temperature regulator A to;
Boot sequence controller afterwards, trigger setting apparatus is exported control signal to switching controller according to the time m-curve of output of setting, trigger switching controller simultaneously, make program set station and PID temperature regulator A connect composition cascade control system A, program set station output control signal is as the setting value of PID temperature regulator A; PID temperature regulator A according to the digital signal that receives and program set station export deviation between control signal through PID computing output regulation signal to D/A converter module A, D/A converter module A is converted to simulating signal by conditioning signal and sends heating controller A to, and heating controller A is according to the heating power of the simulating signal control heater A receiving; In the time that sequence controller runs to the time of technological requirement, sequence controller triggers switching controller, make PID pressure governor and PID temperature regulator A connect composition cascade control system B, make program set station and PID temperature regulator A disconnect simultaneously, be that cascade control system A disconnects, pass through successively the heating power of D/A converter module A, heating controller A control heater A by cascade control system B;
In the time that charge cask internal pressure transmitter gathers the internal pressure of charge cask, wireway temperature transmitter gathers wireway temperature analog signal and is given and sends analog-to-digital conversion module C to, analog-to-digital conversion module C is converted to digital signal by wireway temperature analog signal and sends PID temperature regulator B to, PID temperature regulator B is according to the deviation between the digital signal receiving and setting value being carried out to PID computing output regulation signal to D/A converter module B, D/A converter module B exports to heating controller B after converting conditioning signal to simulating signal, heating controller B is according to the heating power of the simulating signal control heater B receiving, current transducer A, current transducer B gather respectively phase line current and the neutral line current of well heater B simultaneously, analog-to-digital conversion module D is converted to digital signal by phase line current signal and sends the chain controller B of protection to, and analog-to-digital conversion module E is converted to digital signal by neutral line current signal and sends the chain controller B of protection to, occur when abnormal, protecting chain controller B trigger switch amount output module B action at the phase line current of well heater B and neutral line current, make heating controller B power-off,
After system operation, gasifying pot internal pressure transmitter sends the internal pressure simulating signal of the gasifying pot collecting to PLC analog input module, and PLC analog input module is converted to digital signal by the internal pressure simulating signal of gasifying pot and sends PLC controller to; Door seal pressure unit sends the door seal pressure simulation signal collecting to PLC analog input module simultaneously, and PLC analog input module converts door seal pressure simulation signal to digital signal and sends PLC controller to; PLC controller compares output contact signal with two ways of digital signals respectively according to the controller bound of graphic operation terminal setting, controls respectively o controller and drives solenoid valve, maintains gasifying pot internal pressure and door seal pressure in the bound of setting.
Between the input end of the output terminal of described analog-to-digital conversion module B and heating controller A, be disposed with the chain controller A of protection and switching value output module A; in the time that the outside wall temperature digital signal of the charge cask of analog-to-digital conversion module B output exceedes safe limit value; protect chain controller A trigger switch amount output module A action, make heating controller A power-off.
A kind of based on described UF
6the UF of vaporization automatic control system
6vaporization autocontrol method, after system operation, described charge cask internal pressure transmitter sends the internal pressure simulating signal of the charge cask collecting to analog-to-digital conversion module A, analog-to-digital conversion module A converts the internal pressure simulating signal of charge cask to digital signal and sends PID pressure governor to, PID pressure governor according to the deviation between the digital signal and the setting value that receive through PID computing output regulation signal to switching controller; Charge cask outside wall temperature transmitter sends the outside wall temperature simulating signal of the charge cask collecting to analog-to-digital conversion module B simultaneously, and analog-to-digital conversion module B converts the outside wall temperature simulating signal of charge cask to digital signal and sends PID temperature regulator A to;
Boot sequence controller afterwards, trigger setting apparatus is exported control signal to switching controller according to the time m-curve of output of setting, trigger switching controller simultaneously, make program set station and PID temperature regulator A connect composition cascade control system A, program set station output control signal is as the setting value of PID temperature regulator A; PID temperature regulator A according to the digital signal that receives and program set station export deviation between control signal through PID computing output regulation signal to D/A converter module A, D/A converter module A is converted to simulating signal by conditioning signal and sends heating controller A to, and heating controller A is according to the heating power of the simulating signal control heater A receiving; In the time that sequence controller runs to the time of technological requirement, sequence controller triggers switching controller, make PID pressure governor and PID temperature regulator A connect composition cascade control system B, make program set station and PID temperature regulator A disconnect simultaneously, be that cascade control system A disconnects, pass through successively the heating power of D/A converter module A, heating controller A control heater A by cascade control system B;
In the time that charge cask internal pressure transmitter gathers the internal pressure of charge cask, wireway temperature transmitter gathers wireway temperature analog signal and is given and sends analog-to-digital conversion module C to, analog-to-digital conversion module C is converted to digital signal by wireway temperature analog signal and sends PID temperature regulator B to, PID temperature regulator B is according to the deviation between the digital signal receiving and setting value being carried out to PID computing output regulation signal to D/A converter module B, D/A converter module B exports to heating controller B after converting conditioning signal to simulating signal, heating controller B is according to the heating power of the simulating signal control heater B receiving, current transducer A, current transducer B gather respectively phase line current and the neutral line current of well heater B simultaneously, analog-to-digital conversion module D is converted to digital signal by phase line current signal and sends the chain controller B of protection to, and analog-to-digital conversion module E is converted to digital signal by neutral line current signal and sends the chain controller B of protection to, occur when abnormal, protecting chain controller B trigger switch amount output module B action at the phase line current of well heater B and neutral line current, make heating controller B power-off,
After system operation, gasifying pot internal pressure transmitter sends the internal pressure simulating signal of the gasifying pot collecting to PLC analog input module, and PLC analog input module is converted to digital signal by the internal pressure simulating signal of gasifying pot and sends PLC controller to; Door seal pressure unit sends the door seal pressure simulation signal collecting to PLC analog input module simultaneously, and PLC analog input module converts door seal pressure simulation signal to digital signal and sends PLC controller to; PLC controller compares output contact signal with two ways of digital signals respectively according to the controller bound of graphic operation terminal setting, controls respectively o controller and drives solenoid valve, maintains gasifying pot internal pressure and door seal pressure in the bound of setting.
Between the input end of the output terminal of described analog-to-digital conversion module B and heating controller A, be disposed with the chain controller A of protection and switching value output module A; in the time that the outside wall temperature digital signal of the charge cask of analog-to-digital conversion module B output exceedes safe limit value; protect chain controller A trigger switch amount output module A action, make heating controller A power-off.
The obtained beneficial effect of the present invention is:
UF6 vaporization automatic control system of the present invention and control method, DCS control system has realized automatically-controlled continuous and the protection of charge cask internal pressure and wall temperature, and the automatically-controlled continuous of wireway temperature and heater current and protection; PLC control system has realized the automatic control and protection of gasifying pot internal pressure and door seal pressure; The present invention has reduced technologist's quantity in post, reduce workman's labour intensity, realize on-the-spot unmanned, safe, continuous, the stable operation of producing are ensured, caused because the parameter controls such as pressure and temperature are not good in the past device damage be forced to stop production maintenance phenomenon obtained obvious improvement, reduce the environmental pollution causing because of overhaul of the equipments, realized safety in production, carried out production strictly in line with rules and regulations, there is good economic benefit and social benefit.
Brief description of the drawings
Fig. 1 is UF of the present invention
6the DCS control system structural drawing of vaporization automatic control system;
Fig. 2 is UF of the present invention
6the PLC control system structural drawing of vaporization automatic control system.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
As shown in Figure 1 and Figure 2, UF of the present invention
6vaporization automatic control system comprises DCS control system and PLC control system, DCS control system comprises charge cask internal pressure transmitter, charge cask outside wall temperature transmitter, wireway temperature transmitter, current transducer A, current transducer B, analog-to-digital conversion module A, analog-to-digital conversion module B, analog-to-digital conversion module C, analog-to-digital conversion module D, analog-to-digital conversion module E, PID pressure governor, program set station, sequence controller, switching controller, PID temperature regulator A, PID temperature regulator B, protect chain controller A, protect chain controller B, D/A converter module A, D/A converter module B, switching value output module A, switching value output module B, heating controller A, heating controller B, well heater A, well heater B, PLC control system comprises gasifying pot internal pressure transmitter, door seal pressure unit, PLC analog input module, PLC controller, graphic operation terminal, o controller,
First DCS control system is described in detail:
After system operation, charge cask internal pressure transmitter sends the internal pressure simulating signal of the charge cask collecting to analog-to-digital conversion module A, analog-to-digital conversion module A converts the internal pressure simulating signal of charge cask to digital signal and sends PID pressure governor to, PID pressure governor according to the deviation between the digital signal and the setting value that receive through PID computing output regulation signal to switching controller; Charge cask outside wall temperature transmitter sends the outside wall temperature simulating signal of the charge cask collecting to analog-to-digital conversion module B simultaneously, and analog-to-digital conversion module B converts the outside wall temperature simulating signal of charge cask to digital signal and sends PID temperature regulator A to;
Boot sequence controller afterwards, trigger setting apparatus is exported control signal to switching controller according to the time m-curve of output of setting, trigger switching controller simultaneously, make program set station and PID temperature regulator A connect composition cascade control system A, program set station output control signal is as the setting value of PID temperature regulator A; PID temperature regulator A according to the digital signal that receives and program set station export deviation between control signal through PID computing output regulation signal to D/A converter module A, D/A converter module A is converted to simulating signal by conditioning signal and sends heating controller A to, and heating controller A is according to the heating power of the simulating signal control heater A receiving; In the time that sequence controller runs to the time of technological requirement, sequence controller triggers switching controller, make PID pressure governor and PID temperature regulator A connect composition cascade control system B, make program set station and PID temperature regulator A disconnect simultaneously, be that cascade control system A disconnects, pass through successively the heating power of D/A converter module A, heating controller A control heater A by cascade control system B;
Between the output terminal of analog-to-digital conversion module B and the input end of heating controller A, be disposed with the chain controller A of protection and switching value output module A, in the time that the outside wall temperature digital signal of the charge cask of analog-to-digital conversion module B output exceedes safe limit value, protect chain controller A trigger switch amount output module A action, make heating controller A power-off;
In the time that charge cask internal pressure transmitter gathers the internal pressure of charge cask, wireway temperature transmitter gathers wireway temperature analog signal and is given and sends analog-to-digital conversion module C to, analog-to-digital conversion module C is converted to digital signal by wireway temperature analog signal and sends PID temperature regulator B to, PID temperature regulator B is according to the deviation between the digital signal receiving and setting value being carried out to PID computing output regulation signal to D/A converter module B, D/A converter module B exports to heating controller B after converting conditioning signal to simulating signal, heating controller B is according to the heating power of the simulating signal control heater B receiving, current transducer A, current transducer B gather respectively phase line current and the neutral line current of well heater B simultaneously, analog-to-digital conversion module D is converted to digital signal by phase line current signal and sends the chain controller B of protection to, and analog-to-digital conversion module E is converted to digital signal by neutral line current signal and sends the chain controller B of protection to, occur when abnormal, protecting chain controller B trigger switch amount output module B action at the phase line current of well heater B and neutral line current, make heating controller B power-off.
Below PLC control system is described in detail:
After system operation, gasifying pot internal pressure transmitter sends the internal pressure simulating signal of the gasifying pot collecting to PLC analog input module, and PLC analog input module is converted to digital signal by the internal pressure simulating signal of gasifying pot and sends PLC controller to; Door seal pressure unit sends the door seal pressure simulation signal collecting to PLC analog input module simultaneously, and PLC analog input module converts door seal pressure simulation signal to digital signal and sends PLC controller to; PLC controller compares output contact signal with two ways of digital signals respectively according to the controller bound of graphic operation terminal setting, controls respectively o controller and drives solenoid valve, maintains gasifying pot internal pressure and door seal pressure in the bound of setting.
Claims (4)
1. a UF
6vaporization automatic control system, is characterized in that: this system comprises DCS control system and PLC control system, DCS control system comprises charge cask internal pressure transmitter, charge cask outside wall temperature transmitter, wireway temperature transmitter, current transducer A, current transducer B, analog-to-digital conversion module A, analog-to-digital conversion module B, analog-to-digital conversion module C, analog-to-digital conversion module D, analog-to-digital conversion module E, PID pressure governor, program set station, sequence controller, switching controller, PID temperature regulator A, PID temperature regulator B, protect chain controller B, D/A converter module A, D/A converter module B, switching value output module B, heating controller A, heating controller B, well heater A, well heater B, PLC control system comprises gasifying pot internal pressure transmitter, door seal pressure unit, PLC analog input module, PLC controller, graphic operation terminal, o controller,
After system operation, described charge cask internal pressure transmitter sends the internal pressure simulating signal of the charge cask collecting to analog-to-digital conversion module A, analog-to-digital conversion module A converts the internal pressure simulating signal of charge cask to digital signal and sends PID pressure governor to, PID pressure governor according to the deviation between the digital signal and the setting value that receive through PID computing output regulation signal to switching controller; Charge cask outside wall temperature transmitter sends the outside wall temperature simulating signal of the charge cask collecting to analog-to-digital conversion module B simultaneously, and analog-to-digital conversion module B converts the outside wall temperature simulating signal of charge cask to digital signal and sends PID temperature regulator A to;
Boot sequence controller afterwards, trigger setting apparatus is exported control signal to switching controller according to the time m-curve of output of setting, trigger switching controller simultaneously, make program set station and PID temperature regulator A connect composition cascade control system A, program set station output control signal is as the setting value of PID temperature regulator A; PID temperature regulator A according to the digital signal that receives and program set station export deviation between control signal through PID computing output regulation signal to D/A converter module A, D/A converter module A is converted to simulating signal by conditioning signal and sends heating controller A to, and heating controller A is according to the heating power of the simulating signal control heater A receiving; In the time that sequence controller runs to the time of technological requirement, sequence controller triggers switching controller, make PID pressure governor and PID temperature regulator A connect composition cascade control system B, make program set station and PID temperature regulator A disconnect simultaneously, be that cascade control system A disconnects, pass through successively the heating power of D/A converter module A, heating controller A control heater A by cascade control system B;
In the time that charge cask internal pressure transmitter gathers the internal pressure of charge cask, wireway temperature transmitter gathers wireway temperature analog signal and is given and sends analog-to-digital conversion module C to, analog-to-digital conversion module C is converted to digital signal by wireway temperature analog signal and sends PID temperature regulator B to, PID temperature regulator B is according to the deviation between the digital signal receiving and setting value being carried out to PID computing output regulation signal to D/A converter module B, D/A converter module B exports to heating controller B after converting conditioning signal to simulating signal, heating controller B is according to the heating power of the simulating signal control heater B receiving, current transducer A, current transducer B gather respectively phase line current and the neutral line current of well heater B simultaneously, analog-to-digital conversion module D is converted to digital signal by phase line current signal and sends the chain controller B of protection to, and analog-to-digital conversion module E is converted to digital signal by neutral line current signal and sends the chain controller B of protection to, occur when abnormal, protecting chain controller B trigger switch amount output module B action at the phase line current of well heater B and neutral line current, make heating controller B power-off,
After system operation, gasifying pot internal pressure transmitter sends the internal pressure simulating signal of the gasifying pot collecting to PLC analog input module, and PLC analog input module is converted to digital signal by the internal pressure simulating signal of gasifying pot and sends PLC controller to; Door seal pressure unit sends the door seal pressure simulation signal collecting to PLC analog input module simultaneously, and PLC analog input module converts door seal pressure simulation signal to digital signal and sends PLC controller to; PLC controller compares output contact signal with two ways of digital signals respectively according to the controller bound of graphic operation terminal setting, controls respectively o controller and drives solenoid valve, maintains gasifying pot internal pressure and door seal pressure in the bound of setting.
2. UF according to claim 1
6vaporization automatic control system; it is characterized in that: between the output terminal of described analog-to-digital conversion module B and the input end of heating controller A, be disposed with the chain controller A of protection and switching value output module A; in the time that the outside wall temperature digital signal of the charge cask of analog-to-digital conversion module B output exceedes safe limit value; protect chain controller A trigger switch amount output module A action, make heating controller A power-off.
3. one kind based on described UF
6the UF of vaporization automatic control system
6vaporization autocontrol method, it is characterized in that: after system operation, described charge cask internal pressure transmitter sends the internal pressure simulating signal of the charge cask collecting to analog-to-digital conversion module A, analog-to-digital conversion module A converts the internal pressure simulating signal of charge cask to digital signal and sends PID pressure governor to, PID pressure governor according to the deviation between the digital signal and the setting value that receive through PID computing output regulation signal to switching controller; Charge cask outside wall temperature transmitter sends the outside wall temperature simulating signal of the charge cask collecting to analog-to-digital conversion module B simultaneously, and analog-to-digital conversion module B converts the outside wall temperature simulating signal of charge cask to digital signal and sends PID temperature regulator A to;
Boot sequence controller afterwards, trigger setting apparatus is exported control signal to switching controller according to the time m-curve of output of setting, trigger switching controller simultaneously, make program set station and PID temperature regulator A connect composition cascade control system A, program set station output control signal is as the setting value of PID temperature regulator A; PID temperature regulator A according to the digital signal that receives and program set station export deviation between control signal through PID computing output regulation signal to D/A converter module A, D/A converter module A is converted to simulating signal by conditioning signal and sends heating controller A to, and heating controller A is according to the heating power of the simulating signal control heater A receiving; In the time that sequence controller runs to the time of technological requirement, sequence controller triggers switching controller, make PID pressure governor and PID temperature regulator A connect composition cascade control system B, make program set station and PID temperature regulator A disconnect simultaneously, be that cascade control system A disconnects, pass through successively the heating power of D/A converter module A, heating controller A control heater A by cascade control system B;
In the time that charge cask internal pressure transmitter gathers the internal pressure of charge cask, wireway temperature transmitter gathers wireway temperature analog signal and is given and sends analog-to-digital conversion module C to, analog-to-digital conversion module C is converted to digital signal by wireway temperature analog signal and sends PID temperature regulator B to, PID temperature regulator B is according to the deviation between the digital signal receiving and setting value being carried out to PID computing output regulation signal to D/A converter module B, D/A converter module B exports to heating controller B after converting conditioning signal to simulating signal, heating controller B is according to the heating power of the simulating signal control heater B receiving, current transducer A, current transducer B gather respectively phase line current and the neutral line current of well heater B simultaneously, analog-to-digital conversion module D is converted to digital signal by phase line current signal and sends the chain controller B of protection to, and analog-to-digital conversion module E is converted to digital signal by neutral line current signal and sends the chain controller B of protection to, occur when abnormal, protecting chain controller B trigger switch amount output module B action at the phase line current of well heater B and neutral line current, make heating controller B power-off,
After system operation, gasifying pot internal pressure transmitter sends the internal pressure simulating signal of the gasifying pot collecting to PLC analog input module, and PLC analog input module is converted to digital signal by the internal pressure simulating signal of gasifying pot and sends PLC controller to; Door seal pressure unit sends the door seal pressure simulation signal collecting to PLC analog input module simultaneously, and PLC analog input module converts door seal pressure simulation signal to digital signal and sends PLC controller to; PLC controller compares output contact signal with two ways of digital signals respectively according to the controller bound of graphic operation terminal setting, controls respectively o controller and drives solenoid valve, maintains gasifying pot internal pressure and door seal pressure in the bound of setting.
4. UF according to claim 3
6vaporization autocontrol method; it is characterized in that: between the output terminal of described analog-to-digital conversion module B and the input end of heating controller A, be disposed with the chain controller A of protection and switching value output module A; in the time that the outside wall temperature digital signal of the charge cask of analog-to-digital conversion module B output exceedes safe limit value; protect chain controller A trigger switch amount output module A action, make heating controller A power-off.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109499089A (en) * | 2018-10-31 | 2019-03-22 | 中国核电工程有限公司 | A kind of device converting solid-state hex to gaseous state hex |
| CN109688638A (en) * | 2018-12-21 | 2019-04-26 | 镇江东方电热有限公司 | The automatic control system and control method of plural serial stage electric heater unit |
| CN113126670A (en) * | 2021-03-31 | 2021-07-16 | 武汉益邦汽车技术有限公司 | Control method and system for LPG vaporizing device |
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