Automatic feeding / discharging system of magnesium electrolytic cell in titanium sponge production process

Abstract

The utility model belongs to the technical field of magnesium smelting, and relates to magnesium smelting through an electrolytic method, in particular to an automatic feeding / discharging system of a magnesium electrolytic cell in the titanium sponge production process. According to the automatic feeding / discharging system, linkage control is carried out on the magnesium layer thickness measuring unit, the magnesium layer liquid level measuring unit, the first electric valve, the second electric valve, the argon assembly, the vacuum assembly and the distributed control system. According to the utility model, the traditional manual feeding and discharging modes are changed, so that the labor capacity is reduced, the production efficiency is improved, a large amount of labor force can be saved, personnel posts are saved, the energy consumption and capital occupation are reduced, the electrolysis efficiency is improved, the product quality is improved, and the service life of equipment is prolonged; by optimizing the device design, the safety performance and the environmental protection performance of the device are improved, the aims of improving the productivity, saving the energy consumption, improving the product quality, shortening the production time and reducing the safety risk are achieved, and good application prospects are achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to magnesium smelting technical field relates to electrolytic method smelting magnesium, especially in the production process of titanium sponge magnesium electrolytic cell automatic feeding / discharge system. BACKGROUND

[0002] Metal magnesium is important raw material in the production process of titanium sponge, and it is widely used in the fields of aviation, aerospace, chemical industry, petroleum, medicine and the like. With the development of science and technology, at present, the methods of magnesium smelting mainly have two kinds: ① from spinel, brine or seawater, the solution containing magnesium chloride is dehydrated or fused magnesium chloride melt, and then electrolysis is carried out, and this method is called electrolytic method; ② using silicon iron to carry out thermal reduction on magnesium oxide generated by calcination from carbonate ore, and this method is called thermal reduction method (Pijiang method). Among them, the principle of electrolytic method smelting magnesium is to electrolyze molten anhydrous magnesium chloride under high temperature environment, so that it is decomposed into metal magnesium and chlorine. But under high temperature environment, the influence of water on the property of molten salt is fatal, so high-purity anhydrous magnesium chloride is the key to the electrolytic method for magnesium production.

[0003] In the existing production equipment of electrolytic magnesium, the feeding mode of magnesium chloride adopts manual intermittent rapid feeding of molten magnesium chloride into the magnesium collection chamber of the electrolytic cell, for example, feeding 6-8 times per day, about 2 tons per time, and about 3 minutes per time. But this feeding mode has the following disadvantages: (1) rapid feeding makes the slag (mainly magnesium oxide) deposited at the bottom of the magnesium collection chamber be rolled up and enter the electrolysis chamber along with the circulation of electrolyte, and adhere to the surface of the electrode to cause electrode passivation; (2) rapid feeding makes the liquid level of the electrolytic cell fluctuate too much, which on one hand will lead to the oxidation and nitridation loss of liquid magnesium on the surface of the magnesium collection chamber due to the air suction from the feeding port, and on the other hand may also lead to the current short circuit phenomenon of the electrolysis chamber due to the too high liquid level. The above-mentioned disadvantages of the feeding mode will inevitably increase the risk of impurities carried by manual feeding, lead to the decrease of electrolysis efficiency of the electrolytic cell, the decrease of production efficiency and the defects of high impurity content in the produced liquid magnesium.

[0004] Therefore, the utility model is provided. Utility model content

[0005] The utility model aims at overcoming the above-mentioned defects of the prior art, and provides an automatic feeding / discharge system of magnesium electrolytic cell in the production process of titanium sponge, so as to improve the production yield and quality, provide protection for safety and environmental protection in the production process, and prolong the service life of the equipment.

[0006] The automatic feeding / discharge system of magnesium electrolytic cell in the production process of titanium sponge comprises: a magnesium chloride crucible, a liquid magnesium crucible and a distributed control system.

[0007] The magnesium chloride crucible is connected with a plurality of magnesium electrolytic cells through a magnesium chloride pipeline, the magnesium chloride pipeline is divided into multiple channels, the outlet of each channel of the magnesium chloride pipeline is connected with a corresponding magnesium electrolytic cell in communication, and a first electric valve is arranged on each channel of the magnesium chloride pipeline, and the first electric valve is connected with a distributed control system;

[0008] Each of the magnesium electrolytic cells is also connected with a liquid magnesium crucible through a liquid magnesium pipeline, the liquid magnesium pipeline is divided into multiple channels, and a second electric valve is arranged on each channel of the liquid magnesium pipeline, and the second electric valve is connected with the distributed control system; a magnesium layer thickness measuring unit and a magnesium layer liquid level measuring unit are arranged in each of the magnesium electrolytic cells, and the magnesium layer thickness measuring unit and the magnesium layer liquid level measuring unit are connected with the distributed control system;

[0009] The magnesium chloride pipeline and the liquid magnesium pipeline are respectively provided with a pipeline heater, and the pipeline heater is connected with the distributed control system; the magnesium chloride crucible is also connected with an argon buffer tank through an argon assembly, and the liquid magnesium crucible is also connected with a vacuum buffer tank through a vacuum assembly; the distributed control system is used to control the start and stop of the argon assembly and the vacuum assembly.

[0010] Further, the magnesium chloride pipeline and the liquid magnesium pipeline are both double-layer hollow pipes composed of an inner layer pipe and an outer layer pipe; the pipeline heater comprises a heating wire wound on the outer wall of the inner layer pipe, and the heating wire is connected with the distributed control system. Preferably, the heating wire is a nickel-chromium alloy heating wire.

[0011] Further, the outer wall of the inner layer pipe is further sleeved with a plurality of support rings, and a plurality of through holes for penetrating the heating wire are formed along the circumferential direction of the support rings.

[0012] Specifically, the magnesium chloride pipeline and the liquid magnesium pipeline are both provided with a heat preservation and insulation structure.

[0013] Specifically, the magnesium chloride crucible is provided with a first feeding port, and the liquid magnesium crucible is provided with a second feeding port.

[0014] Similarly, each of the magnesium electrolytic cells is respectively provided with a magnesium chloride feeding port and a liquid magnesium feeding port.

[0015] Specifically, the outlet of each channel of the magnesium chloride pipeline is connected with the magnesium chloride feeding port in communication, and the outlet of each channel of the liquid magnesium pipeline is connected with the liquid magnesium feeding port in communication.

[0016] Optionally, the argon assembly comprises an argon buffer tank, the argon buffer tank is connected with the magnesium chloride crucible in communication through a first pipeline, a third electric valve for controlling the flow of argon is arranged on the first pipeline, and the third electric valve is connected with the distributed control system.

[0017] Optionally, the vacuum assembly comprises a vacuum buffer tank, a vacuum pump, a fourth electric valve and a second pipeline, the vacuum buffer tank is connected with the liquid magnesium crucible through the vacuum pump and the second pipeline, the fourth electric valve and a flow meter are respectively installed on the second pipeline, and the vacuum pump, the fourth electric valve and the flow meter are connected with the distributed control system.

[0018] Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

[0019] Through linkage control of the magnesium layer thickness measurement unit, the magnesium layer liquid level measurement unit, the first electric valve, the second electric valve, the first vacuum assembly, the second vacuum assembly and the distributed control system, the following is specifically achieved:

[0020] 1) Discharging: the magnesium layer thickness measurement unit is used to monitor the magnesium layer thickness of the corresponding magnesium electrolytic cell in real time, and when the monitored magnesium layer thickness reaches an upper limit value, the thickness value is fed back to the distributed control system in a timely manner, the distributed control system controls the second electric valve of the liquid magnesium pipeline of the magnesium electrolytic cell corresponding to the current magnesium layer thickness measurement unit to be opened according to a preset thickness value; after the distributed control system identifies that the second electric valve is opened, the vacuum pump assembly is started to gradually adjust the vacuum pump frequency to perform vacuumizing on the liquid magnesium crucible, in the vacuumizing process, the liquid magnesium crucible and the pipeline thereof are in a vacuum state at this time, under the action of the vacuum, the liquid magnesium in the magnesium electrolytic cell is slowly drawn out and flows into the liquid magnesium crucible through the liquid magnesium pipeline as the vacuum degree increases, and when the monitored magnesium layer thickness reaches a lower limit value, the thickness value is fed back to the distributed control system in a timely manner, and the distributed control system closes the second electric valve and the vacuum assembly after receiving the information; at this time, the discharging is completed.

[0021] 2) Charging: after the discharging is completed, the magnesium layer liquid level measurement unit is used to monitor the magnesium layer liquid level of the current magnesium electrolytic cell in real time, and when the monitored magnesium layer liquid level value reaches a lower limit value, the liquid level value is fed back to the distributed control system in a timely manner, the distributed control system controls the first electric valve of the magnesium chloride pipeline of the current magnesium electrolytic cell and the argon assembly to be opened, a positive pressure is gradually formed in the magnesium chloride crucible, and the magnesium chloride flows into the corresponding magnesium electrolytic cell through the magnesium chloride pipeline; when the magnesium layer liquid level reaches a preset upper limit value, the magnesium layer liquid level measurement unit feeds back the monitored liquid level value to the distributed control system in a timely manner, and the distributed control system closes the first electric valve and the argon assembly.

[0022] In summary, the automatic feeding / discharging system provided by the utility model changes the traditional manual feeding and discharging mode, reduces the labor amount, and improves the production efficiency; meanwhile, the whole system is closed, avoids the situation that the manual feeding carries impurities, improves the liquid magnesium production, quality, electrolysis efficiency, and service life of the electrolytic cell and other equipment; meanwhile, the waste gas generated in the manual feeding and magnesium discharging operation process is reduced, the production process is more environmentally friendly, has good application prospect, can be applied to the energy-saving and efficient titanium sponge production, and provides a titanium sponge production matching equipment with yield increase and energy saving for the related industry. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings incorporated into the specification and forming a part thereof, together with the specification, explain the principles of the utility model.

[0024] In order to more clearly explain the technical scheme in the embodiment of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, other drawings can be obtained by the person skilled in the art without creative labor.

[0025] Fig. 1 The utility model provides a kind of automatic feeding / discharging system of magnesium electrolytic cell in the production process of titanium sponge provided by the utility model for the top view of the automatic feeding / discharging system of magnesium electrolytic cell in the production process of titanium sponge;

[0026] Fig. 2 The utility model provides a kind of automatic feeding / discharging system of magnesium electrolytic cell in the production process of titanium sponge provided by the utility model for the side view of the automatic feeding / discharging system of magnesium electrolytic cell in the production process of titanium sponge;

[0027] Fig. 3 The structure diagram of the pipeline heater in the utility model.

[0028] Wherein: 1, magnesium chloride crucible;1-1, magnesium chloride pipeline;1-2, liquid magnesium pipeline;2, liquid magnesium crucible;3, first feeding port;4, second feeding port;5, second electric valve;6, magnesium chloride feeding port;7, liquid magnesium feeding port;8, argon buffer tank;9, vacuum buffer tank;10, first electric valve;11, magnesium electrolytic cell;12, magnesium layer liquid level measuring unit;13, magnesium layer thickness measuring unit;14, heating wire;15, support ring;16, pipeline heater;17, terminal post;18, first pipeline;19, second pipeline. DETAILED DESCRIPTION

[0029] The exemplary embodiments will be described in detail below with reference to the drawings. The following description is presented in connection with the drawings, in which the same reference numerals are used to designate the same or similar elements throughout the several figures. The implementations described in the following exemplary embodiments are not meant to represent all implementations consistent with the present application. Rather, they are merely examples that are consistent with some aspects of the present application as detailed in the appended claims.

[0030] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings and embodiments.

[0031] Embodiment

[0032] Referring to Figs. 1-3 , the embodiment provides an automatic feeding / discharging system of a magnesium electrolysis cell in a titanium sponge production process, comprising: a magnesium chloride crucible 1, a liquid magnesium crucible 2 and a distributed control system;

[0033] The magnesium chloride crucible 1 is connected with a plurality of magnesium electrolysis cells 11 through a magnesium chloride pipeline 1-1, the magnesium chloride pipeline 1-1 is divided into multiple paths, the outlet of each path of the magnesium chloride pipeline 1-1 is connected with a corresponding magnesium electrolysis cell 11 in communication, and each path of the magnesium chloride pipeline 1-1 is provided with a first electric valve 10, and the first electric valve 10 is connected with the distributed control system;

[0034] Each of the magnesium electrolysis cells 11 is further connected with the liquid magnesium crucible 2 through a liquid magnesium pipeline 1-2, the liquid magnesium pipeline 1-2 is divided into multiple paths, and each path of the liquid magnesium pipeline 1-2 is provided with a second electric valve 5, and the second electric valve 5 is connected with the distributed control system; the magnesium layer thickness measuring unit 13 and the magnesium layer liquid level measuring unit 12 are arranged in each of the magnesium electrolysis cells 11, and both are connected with the distributed control system;

[0035] The magnesium chloride pipeline 1-1 and the liquid magnesium pipeline 1-2 are respectively provided with a pipeline heater 16, and the pipeline heater 16 is connected with the distributed control system; the magnesium chloride crucible 1 is further connected with an argon buffer tank 8 through an argon assembly, and the liquid magnesium crucible 2 is further connected with a vacuum buffer tank 9 through a vacuum assembly; the distributed control system is used to control the start and stop of the argon assembly and the vacuum assembly.

[0036] Further, the magnesium chloride pipeline 1-1 and the liquid magnesium pipeline 1-2 are both double-layer hollow pipes, which are composed of an inner layer pipe and an outer layer pipe; the pipeline heater 16 comprises a heating wire 14 wound on the outer wall of the inner layer pipe, and the heating wire 14 is connected with the distributed control system.

[0037] Further, the outer wall of the inner layer pipe is further sleeved with a plurality of support rings, a plurality of through holes for penetrating the heating wire 14 are arranged along the circumferential direction of the support rings, and the through holes can facilitate the penetration of the heating wire 14 and can also avoid short circuiting. Preferably, the heating wire 14 is a nickel-chromium alloy heating wire.

[0038] It should be noted that the type of the heating wire 14 of the pipe heater is not specifically limited in the embodiment, and in principle, as long as the heating wire 14 can heat the fluid (liquid magnesium or magnesium chloride) in the pipe, for example, the heating wire 14 can be a high-temperature resistance wire. The arrangement of the high-temperature resistance wire can adopt a common spiral winding structure, and the two ends (terminal posts 17) of the high-temperature resistance wire are respectively connected with the distributed control system. Further, in order to prolong the service life of the heating wire 14, after the high-temperature resistance wire is wound and arranged on the outer wall of the inner layer pipe, crystalline magnesium oxide powder with good insulation and heat conduction performance is filled between the outer wall of the inner layer pipe and the inner wall of the outer layer pipe.

[0039] In order to enhance the applicability of the system in different environments, the outer part of the magnesium chloride pipe 1-1 and the liquid magnesium pipe 1-2 is respectively provided with a heat preservation and insulation structure. The pipe has good heat preservation and insulation effect by fixing the heat preservation and insulation material on the outer periphery of the magnesium chloride pipe 1-1 and the outer periphery of the liquid magnesium pipe 1-2, respectively, so as to realize efficient use of energy in the whole system.

[0040] In order to facilitate the operator to add materials, the magnesium chloride crucible 1 is provided with a first feeding port 3 for adding magnesium chloride, and the liquid magnesium crucible 2 is provided with a second feeding port 4 for adding liquid magnesium. Similarly, each of the magnesium electrolytic cells 11 is respectively provided with a magnesium chloride feeding port 6 and a liquid magnesium feeding port 7. The outlet of each magnesium chloride pipe 1-1 is connected with the magnesium chloride feeding port 6, and the outlet of each liquid magnesium pipe 1-2 is connected with the liquid magnesium feeding port 7.

[0041] Further, the argon assembly includes an argon buffer tank 8, the argon buffer tank 8 is connected with the magnesium chloride crucible 1 through a first pipe 18, the first pipe 18 is provided with a third electric valve for controlling the flow of argon, and the third electric valve is connected with the distributed control system.

[0042] Further, the vacuum assembly includes a vacuum buffer tank 9, a vacuum pump, a fourth electric valve and a second pipe 19. The vacuum buffer tank 9 is connected with the liquid magnesium crucible 2 through the vacuum pump and the second pipe 19. The second pipe 19 is respectively provided with the fourth electric valve and a flow meter, and the vacuum pump and the fourth electric valve are connected with the distributed control system.

[0043] In summary, the automatic feeding / discharging system is especially suitable for feeding / discharging of the magnesium electrolysis tank in the titanium sponge production process, linkage control is performed on the magnesium layer thickness measurement unit 13, the magnesium layer liquid level measurement unit 12, the first electric valve 10, the second electric valve 5, the argon assembly, the vacuum assembly and the distributed control system, and the specific working principle is as follows.

[0044] Automatic discharging: the magnesium layer thickness measurement unit 13 is used to monitor the magnesium layer thickness of the magnesium electrolysis tank 11 in real time, when the monitored magnesium layer thickness reaches the upper limit value, the thickness value is fed back to the distributed control system in time, the distributed control system controls the second electric valve 5 of the liquid magnesium pipeline 1-2 of the magnesium electrolysis tank 11 corresponding to the current magnesium layer thickness measurement unit 13 to open according to the preset thickness value, after the distributed control system identifies that the second electric valve 5 is opened, the vacuum assembly is started to gradually adjust the vacuum pump frequency to perform vacuumizing on the liquid magnesium crucible 2, in the vacuumizing process, the liquid magnesium crucible 2 and the pipeline (the second pipeline 19) are in a vacuum state at this time, under the action of the vacuum, the liquid magnesium in the magnesium electrolysis tank 11 is slowly drawn out and flows to the liquid magnesium crucible 2 through the liquid magnesium pipeline 1-2 as the vacuum degree is improved, when the monitored magnesium layer thickness reaches the lower limit value, the thickness value is fed back to the distributed control system in time, the distributed control system closes the second electric valve 5 and the vacuum assembly after receiving the information; at this time, the discharging is completed.

[0045] Automatic feeding: after the automatic discharging is completed, the magnesium layer liquid level measurement unit 12 is used to monitor the magnesium layer liquid level of the current magnesium electrolysis tank 11 in real time, when the monitored magnesium layer liquid level value reaches the lower limit value, the liquid level value is fed back to the distributed control system in time, the distributed control system controls the first electric valve 10 of the magnesium chloride pipeline 1-1 of the current magnesium electrolysis tank 11 and the third electric valve in the argon assembly to open, after the distributed control system identifies that the third electric valve is opened, the opening degree of the third electric valve is controlled, so that the argon in the argon buffer tank 8 enters the magnesium chloride crucible 1, the positive pressure is gradually formed in the magnesium chloride crucible 1 to make the magnesium chloride flow to the corresponding magnesium electrolysis tank 11 through the magnesium chloride pipeline 1-1; when the magnesium layer liquid level reaches the preset upper limit value, the magnesium layer liquid level measurement unit 12 feeds back the monitored liquid level value to the distributed control system in time, the distributed control system closes the first electric valve 10 and the third electric valve, and thus the automatic discharging / feeding process of one magnesium electrolysis tank 11 is completed.

[0046] The automatic feeding / discharging system changes the traditional manual feeding and discharging mode, reduces the labor amount and improves the production efficiency; meanwhile, the whole system is closed, the situation that impurities are brought by manual feeding is avoided, the liquid magnesium yield, quality, electrolysis efficiency, service life of the electrolysis tank and other equipment are improved; meanwhile, waste gas generated in the manual feeding and magnesium discharging operation process is reduced, the production process is more environmentally friendly, and the automatic feeding / discharging system has a good application prospect.

[0047] The foregoing merely illustrates the principles of the application and various modifications can be devised by those skilled in the art without departing from the spirit or scope of the application. The appended claims are intended to cover all such modifications.

[0048] It is to be understood that the application is not limited to the details described herein and that various modifications and changes can be made without departing from the spirit or scope of the application. The application is defined by the appended claims.

Claims

1. An automatic feeding / discharging system for a magnesium electrolysis cell in a titanium sponge production process, characterized in that, The application relates to a magnesium chloride crucible (1), a liquid magnesium crucible (2) and a distributed control system. The magnesium chloride crucible (1) is connected with a plurality of magnesium electrolytic cells (11) through a magnesium chloride pipeline (1-1), the magnesium chloride pipeline (1-1) is divided into multiple channels, the outlet of each channel of the magnesium chloride pipeline (1-1) is connected with a corresponding magnesium electrolytic cell (11), and each channel of the magnesium chloride pipeline (1-1) is provided with a first electric valve (10), the first electric valve (10) is connected with the distributed control system. Each magnesium electrolytic cell (11) is further connected with the liquid magnesium crucible (2) through a liquid magnesium pipeline (1-2), the liquid magnesium pipeline (1-2) is divided into multiple channels, and each channel of the liquid magnesium pipeline (1-2) is provided with a second electric valve (5), the second electric valve (5) is connected with the distributed control system; each magnesium electrolytic cell (11) is provided with a magnesium layer thickness measuring unit (13) and a magnesium layer liquid level measuring unit (12), and both are connected with the distributed control system. The magnesium chloride pipeline (1-1) and the liquid magnesium pipeline (1-2) are respectively provided with a pipeline heater (16), the pipeline heater (16) is connected with the distributed control system; the magnesium chloride crucible (1) is further connected with an argon buffer tank (8) through an argon assembly, and the liquid magnesium crucible (2) is further connected with a vacuum buffer tank (9) through a vacuum assembly; the distributed control system is used for controlling the start and stop of the argon assembly and the vacuum assembly. The magnesium chloride pipeline (1-1) and the liquid magnesium pipeline (1-2) are both double-layer hollow pipes, the double-layer hollow pipe is composed of an inner layer pipe and an outer layer pipe; the pipeline heater (16) comprises heating wires (14) wound on the outer wall of the inner layer pipe, and the heating wires (14) are connected with the distributed control system.

2. The automatic feeding / discharging system of the magnesium electrolysis cell in the process for producing titanium sponge according to claim 1, characterized in that, The outer wall of the inner layer pipe is further sleeved with a plurality of supporting rings (15), a plurality of through holes for penetrating the heating wires (14) are formed in the circumferential direction of the supporting rings (15).

3. The automatic feeding / discharging system of the magnesium electrolysis cell in the process for producing titanium sponge according to claim 2, characterized in that, The heating wires (14) are made of nickel-chromium alloy heating wires.

4. The automatic feeding / discharging system of the magnesium electrolysis cell in the process for producing titanium sponge according to claim 2, characterized in that, The magnesium chloride pipeline (1-1) and the liquid magnesium pipeline (1-2) are both provided with heat preservation and heat insulation structures.

5. The automatic feeding / discharging system of the magnesium electrolysis cell in the process for producing titanium sponge according to claim 1, characterized in that, The magnesium chloride crucible (1) is provided with a first feeding port (3), and the liquid magnesium crucible (2) is provided with a second feeding port (4).

6. The automatic feeding / discharging system of the magnesium electrolysis cell in the process for producing titanium sponge according to claim 1, characterized in that, Each magnesium electrolytic cell (11) is respectively provided with a magnesium chloride feeding port (6) and a liquid magnesium feeding port (7).

7. The automatic feeding / discharging system of the magnesium electrolysis cell in the process for producing titanium sponge according to claim 1, characterized in that, The outlet of each channel of the magnesium chloride pipeline (1-1) is connected with the magnesium chloride feeding port (6), and the outlet of each channel of the liquid magnesium pipeline (1-2) is connected with the liquid magnesium feeding port (7).

8. The automatic feeding / discharging system of the magnesium electrolysis cell in the process for producing titanium sponge according to claim 7, characterized in that, The argon assembly comprises an argon buffer tank (8), the argon buffer tank (8) is connected with the magnesium chloride crucible (1) through a first pipeline (18), a third electric valve for controlling the argon flow is arranged on the first pipeline (18), and the third electric valve is connected with the distributed control system.

9. The automatic feeding / discharging system of the magnesium electrolysis cell in the process for producing titanium sponge according to claim 1, characterized in that, ​ 10. The automatic feeding / discharging system of the magnesium electrolysis cell in the process for producing titanium sponge according to claim 1, characterized in that, The vacuum assembly comprises a vacuum buffer tank (9), a vacuum pump, a fourth electric valve and a second pipeline, the vacuum buffer tank (9) is connected with the liquid magnesium crucible (2) through the second pipeline (19) by the vacuum pump, the fourth electric valve and a flow meter are respectively installed on the second pipeline (19), and the vacuum pump and the fourth electric valve are connected with the distributed control system.

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