Nitrogen sealing device for yellow phosphorus electric furnace electrode

Abstract

The invention relates to a yellow phosphorus electric furnace electrode nitrogen sealing device which comprises a sand sealing sleeve arranged on the periphery of an electrode, and a sealing device used for clamping the electrode in the radial direction is arranged between the sand sealing sleeve and an electric furnace cover electrode pipe connecting flange. The sealing device comprises a base, base flanges are arranged on the base, each base flange is provided with a conical inner cylinder and an outer cylinder, the conical inner cylinders and the outer cylinders are connected through an upper cover plate, nitrogen uniform distribution pipes are arranged on the lower portions of the conical inner cylinders, the ends, facing the electrode direction, of the nitrogen uniform distribution pipes are communicated with graphite packing, and the outer cylinders are provided with nitrogen pipes. The base is of a semi-arc structure, the end face is closed by a steel plate to form a nitrogen sealing ring body, the nitrogen sealing ring body is of a two-piece semi-arc structure, and the inner edge of the sealing face is in mutual extrusion contact with the side face of the electrode and the graphite packing. The method is suitable for sealing electrodes of equipment such as a yellow phosphorus electric furnace, and has the advantages of safety, simplicity and low cost.

Description

Technical Field

[0001] The invention relates to the technical field of yellow phosphorus electric furnace electrode sealing, in particular to a yellow phosphorus electric furnace electrode nitrogen sealing device. Background Art

[0002] In the production of yellow phosphorus, the main equipment is produced in a fully sealed electric furnace. The electrodes used in the production process are movable at any time. During the movement of the electrodes, gaps will appear. The electric furnace system is slightly positively pressurized, which can easily leak the phosphorus furnace gas and cause combustion, which has a certain impact on the working environment. Therefore, a sealing device is needed to seal the periphery of the electrode.

[0003] In the prior art, most yellow phosphorus production uses water seals to seal electrodes. During the water seal process, the water seal must be cleaned within a certain period, and safety accidents such as burning and poisoning are likely to occur during the cleaning process. In addition, the inner cylinder of the water seal will almost always be corroded after one year of use and must be replaced, and the replacement work takes a long time and requires a lot of labor.

[0004] Therefore, an electrode sealing device with reasonable structural design, easy implementation, safety and reliability is objectively needed. Summary of the invention

[0005] In view of the problem that the water seal is used to seal the electrodes of the yellow phosphorus electric furnace in the prior art, which leads to safety hazards such as burning and poisoning during the water seal cleaning process and the water seal inner cylinder is easily corroded, the present invention provides a yellow phosphorus electric furnace electrode nitrogen sealing device, the purpose of which is to seal the electrode in a nitrogen sealing manner to avoid the cleaning of the water seal and the corrosion of the water seal inner cylinder. The yellow phosphorus electric furnace electrode nitrogen sealing device of the present invention mainly includes a nitrogen sealing ring body, a nitrogen supply pipeline and a sealing structure. The nitrogen sealing ring body is sleeved on the electrode to form a sealed space between the electrode and the electrode. The nitrogen supply pipeline is connected to the nitrogen sealing ring body, and a positive pressure is formed by continuously supplying nitrogen into the sealed space. Nitrogen enters the sealed space between the nitrogen sealing ring body and the electrode through the nitrogen uniform distribution pipe. Air is prevented from entering and phosphorus furnace gas is prevented from leaking. The graphite packing of the sealing structure filler is arranged at the contact between the nitrogen sealing ring body and the electrode to further improve the sealing effect.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a yellow phosphorus electric furnace electrode nitrogen sealing device, comprising a sand sealing sleeve arranged on the periphery of the electrode, a sealing device for clamping the electrode in radial direction is arranged between the sand sealing sleeve and the electrode pipe flange of the electric furnace cover;

[0007] The sealing device comprises a base, a base flange is arranged on the base, a conical inner cylinder and an outer cylinder are arranged on each base flange, the conical inner cylinder and the outer cylinder are connected through an upper cover plate, a nitrogen uniform distribution pipe is arranged at the lower part of the conical inner cylinder, the end of each nitrogen uniform distribution pipe facing the electrode is connected to a graphite packing, a nitrogen pipe is arranged at the outer cylinder, the base is in a semicircular arc structure, the end face is closed by a steel plate to form a nitrogen sealing ring body, the nitrogen sealing ring body is a 2-piece semicircular arc structure, the inner edge of the sealing surface and the side face of the electrode plus the graphite packing are in mutual compression contact.

[0008] Further: the base is symmetrically arranged with the axis of the electrode as the center.

[0009] Furthermore: the base is provided with mounting bolt holes on the steel plate, and bolts, nuts and asbestos pads together form a circular ring sleeved on the periphery of the electrode.

[0010] Further: the nitrogen sealing ring body is two semicircular arc-shaped structural cavities, one of which is provided with a nitrogen pipe at both ends, and the other is provided with a nitrogen pipe at one end, which are connected by a hose, and the nitrogen pipe is connected to a nitrogen gas source.

[0011] Furthermore: the base flange is connected to the electrode pipe flange of the electric furnace cover through a fixing clip and an asbestos pad, a mica pad I, a mica pad II and a combination of stud bolts, nuts and flat washers.

[0012] Furthermore: the conical inner cylinder is provided with a heightened cone sand seal sleeve at an angle, and the high cone sand seal sleeve is filled with quartz sand.

[0013] Furthermore: the base is made of 304, 316L or a combination of materials.

[0014] Furthermore: the annular filling height of the graphite packing is 100mm-200mm.

[0015] Furthermore: the height of the base is 1-1.5 times the diameter of the electrode, the height of the nitrogen sealing ring is 0.5-0.8 times the diameter of the electrode, and the installation gap between the lower part of the base flange and the electrode is 0-2mm.

[0016] The beneficial technical effects of the present invention are:

[0017] 1. Use nitrogen sealing to seal the electrode to avoid cleaning of the water seal and corrosion of the inner cylinder of the water seal.

[0018] 2. Through nitrogen sealing, air is effectively prevented from entering the area around the electrode, providing a stable oxygen-free environment for the electrode, while exerting radial and axial forces on the electrode to achieve a good sealing effect.

[0019] 3. The present invention has a simple structure and is easy to install. The design of the nitrogen sealing ring, nitrogen supply pipeline and sealing structure is concise and clear, and it is easy to install on the existing yellow phosphorus electric furnace electrodes, without large-scale modification of the electric furnace, thus reducing installation costs and time.

[0020] 4. Low cost of use. Nitrogen is a common industrial gas with a relatively low price. Moreover, due to the good sealing of the device, the consumption rate of nitrogen is slow, which further reduces the cost of use.

[0021] 5. Adding quartz sand into the sand seal can compress the quartz sand by gravity to generate downward extrusion force, thereby greatly improving the nitrogen sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 It is a schematic diagram of the installation cross-sectional structure of the present invention;

[0024] In the figure: 1 base; 2 bolts; 3 nuts; 4 asbestos pads; 5 mica pads; 6 electrodes; 13 quartz sand; 14 graphite packing; 15 furnace cover electrode pipe flange; 1-5 nitrogen pipe; 1-6 upper cover plate; 1-7 high cone sand seal.

[0025] Figure 2 It is a schematic diagram of the base structure of the present invention;

[0026] In the figure: 1 base; 16 mounting bolt holes; 1-5 nitrogen pipe; 1-6 upper cover plate; 1-7 high cone sand seal; 1-8 nitrogen uniform distribution pipe.

[0027] Figure 3 It is a detailed schematic diagram of the base of the present invention;

[0028] In the figure: 1-1 base flange; 1-2 conical inner cylinder; 1-3 outer cylinder; 1-4 steel plate.

[0029] Figure 4 It is a top view schematic diagram of the present invention;

[0030] In the figure: 6 electrode; 7 asbestos pad; 8 mica pad; 9 fixing clip; 10 stud bolt; 11 nut; 12 flat washer; 1-5 nitrogen pipe; 17 nitrogen connecting pipe.

[0031] Figure 5 is a detailed schematic diagram of the fixing clip of the present invention;

[0032] In the figure: 4 asbestos pad; 5 mica pad I; 8 mica pad II; 9 fixing clip; 10 stud bolt; 11 nut; 12 flat washer. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] like Figure 1-5 , a nitrogen sealing device for yellow phosphorus electric furnace electrodes, comprising a sand sealing sleeve 1-7 arranged on the periphery of an electrode 6, a sealing device for clamping the electrode in the radial direction is arranged between the sand sealing sleeve and the electrode pipe flange 15 of the electric furnace cover;

[0035] The sealing device includes a base 1, on which a base flange 1-1 is provided, each base flange is provided with a conical inner cylinder 1-2 and an outer cylinder 1-3, the conical inner cylinder is connected to the outer cylinder through an upper cover plate 1-6, the lower part of the conical inner cylinder is provided with nitrogen uniform distribution tubes 1-8, the number is 10, the diameter is 12mm, the end of each nitrogen uniform distribution tube facing the electrode direction is connected to the middle of the graphite packing 14 flush, the outer cylinder is provided with a nitrogen pipe 1-5, the base is a semicircular arc structure, the end face is closed by a steel plate 1-4 to form a nitrogen sealing ring body, the nitrogen sealing ring body is a two-piece semicircular arc structure, the inner edge of the sealing surface and the side of the electrode plus the graphite packing are squeezed and contacted with each other.

[0036] In the present invention, the base is symmetrically arranged with the axis of the electrode as the center, and the base, through the mounting bolt holes 16 arranged on the steel plate, the bolts 2, the nuts 3 and the asbestos pads 7, together form a circular ring sleeved on the periphery of the electrode.

[0037] In the present invention, the nitrogen sealing ring body is two semicircular arc-shaped structural cavities, one of which is provided with nitrogen pipes at both ends, and the other is provided with a nitrogen pipe at one end, which are connected through a hose 17, and the nitrogen pipe is connected to a nitrogen gas source.

[0038] In the present invention, the base flange is connected to the electrode pipe flange of the electric furnace cover through a combination of a fixing clip 9, an asbestos pad 4, a mica pad I 5, a mica pad II 8, a stud bolt 10, a nut 11, and a flat washer 12.

[0039] In the present invention, the conical inner cylinder is provided with a heightened cone sand seal 1-7 along an angle, and the high cone sand seal is filled with quartz sand 13.

[0040] In the present invention, the base is made of 304, 316L or a combination of materials.

[0041] In the present invention, the annular filling height of the graphite packing is 150 mm.

[0042] In the present invention, the height of the base is 1.25 times the diameter of the electrode, the height of the nitrogen sealing ring is 0.6 times the diameter of the electrode, and the installation gap between the lower part of the base flange and the electrode is 0.5 mm.

[0043] In the present invention, in order to ensure that nitrogen is evenly distributed around the electrode, the nitrogen sealing ring is arranged in an O-shape around the electrode. Obviously, the nitrogen sealing ring can also be designed to be square and surround the electrode.

[0044] In the present invention, for the convenience of installation and maintenance, the base of the electrode nitrogen sealing device is a two semicircular structure, the outer periphery of the electrode is annularly installed by gaskets and bolts and nuts, and the bottom is connected to the electrode pipe flange of the electric furnace cover by a fixing clip.

[0045] In the present invention, annular graphite packing and quartz sand are sequentially filled between the base and the electrode to reduce nitrogen loss.

[0046] The yellow phosphorus electric furnace electrode nitrogen sealing device of the present invention mainly includes a nitrogen sealing ring body, a nitrogen supply pipeline and a sealing structure. The nitrogen sealing ring body is mounted on the electrode to form a sealed space with the electrode. The nitrogen supply pipeline is connected to the nitrogen sealing ring body, and a positive pressure is formed by continuously supplying nitrogen into the sealed space. Nitrogen enters the sealed space between the nitrogen sealing ring body and the electrode through the nitrogen distribution pipe. Air is prevented from entering and phosphorus furnace gas is prevented from leaking. The graphite packing of the sealing structure filler is arranged at the contact point between the nitrogen sealing ring body and the electrode to further improve the sealing effect. The high cone sand seal is filled with quartz sand to reduce the loss of nitrogen leakage.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. Yellow phosphorus electric furnace electrode nitrogen sealing device, characterized in that: It includes a sand seal sleeve arranged on the periphery of the electrode, and a sealing device for clamping the electrode in radial direction is arranged between the sand seal sleeve and the electrode pipe flange of the electric furnace cover; The sealing device comprises a base, a base flange is arranged on the base, a conical inner cylinder and an outer cylinder are arranged on each base flange, the conical inner cylinder and the outer cylinder are connected through an upper cover plate, a nitrogen uniform distribution pipe is arranged at the lower part of the conical inner cylinder, the end of each nitrogen uniform distribution pipe facing the electrode is connected to a graphite packing, a nitrogen pipe is arranged at the outer cylinder, the base is in a semicircular arc structure, the end face is closed by a steel plate to form a nitrogen sealing ring body, the nitrogen sealing ring body is a 2-piece semicircular arc structure, the inner edge of the sealing surface and the side face of the electrode plus the graphite packing are in mutual compression contact.

2. The yellow phosphorus electric furnace electrode nitrogen sealing device according to claim 1, characterized in that: The base is symmetrically arranged with the axis of the electrode as the center.

3. The yellow phosphorus electric furnace electrode nitrogen sealing device according to claim 1 or 2, characterized in that: The base is provided with mounting bolt holes, bolts, nuts and asbestos pads on the steel plate to form a circular ring sleeved on the periphery of the electrode.

4. The yellow phosphorus electric furnace electrode nitrogen sealing device according to claim 1, characterized in that: The nitrogen sealing ring body is composed of two semicircular arc-shaped structural cavities, one of which is provided with nitrogen pipes at both ends, and the other is provided with a nitrogen pipe at one end, which are connected by a hose, and the nitrogen pipe is connected to a nitrogen gas source.

5. The yellow phosphorus electric furnace electrode nitrogen sealing device according to claim 1, characterized in that: The base flange is connected to the electrode pipe flange of the electric furnace cover through a fixing clamp, an asbestos pad, a mica pad I, a mica pad II, a stud bolt, a nut and a flat washer.

6. The yellow phosphorus electric furnace electrode nitrogen sealing device according to claim 1, characterized in that: The conical inner cylinder is provided with a heightened cone sand seal sleeve at an angle, and the high cone sand seal sleeve is filled with quartz sand.

7. The yellow phosphorus electric furnace electrode nitrogen sealing device according to claim 1, characterized in that: The base is made of 304, 316L or a combination of materials.

8. The yellow phosphorus electric furnace electrode nitrogen sealing device according to claim 1, characterized in that: The annular filling height of the graphite packing is 100mm-200mm.

9. The yellow phosphorus electric furnace electrode nitrogen sealing device according to claim 1, characterized in that: The height of the base is 1-1.5 times the diameter of the electrode, the height of the nitrogen sealing ring is 0.5-0.8 times the diameter of the electrode, and the installation gap between the lower part of the base flange and the electrode is 0-2mm.

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