A high-pressure mechanical sealing device for chromium-iron alkali oxidation reactor

Abstract

The present invention relates to a high-pressure mechanical seal device for a chromium iron alkali oxidation reactor, which is rotatably sealed on a rotating shaft of the reactor, and comprises a cooling flange seat, which is sleeved on the bottom of the rotating shaft and fixed above the reactor flange of the reactor, and is used to block the heat transferred upward by the reactor; a medium end static ring seat is fixed on the top of the cooling flange seat; a double-end mechanical seal part is arranged on the top of the medium end static ring seat through a sealing seat; an atmospheric end static ring seat is fixed on the top of the sealing seat, and a sealing cavity is formed inside the atmospheric end static ring seat, the sealing seat, the double-end mechanical seal part and the medium end static ring seat; a first port of the balancing tank is connected to the reactor through a pipeline, a second port thereof is connected to a sealing liquid inlet of the sealing cavity through a pipeline, and a third end thereof is connected to a sealing liquid outlet of the sealing cavity through a pipeline, so as to keep the pressure balance in the reactor, the balancing tank and the sealing cavity. The balancing tank is communicated with the inside of the reactor and the mechanical seal, so as to ensure that the internal pressure of the double-end faces of the mechanical seal is consistent with the pressure in the reactor, and prolong the sealing life.

Description

Technical Field

[0001] The invention relates to the technical field of reactor sealing, and more particularly to a high-pressure mechanical sealing device for a ferrochrome alkaline oxidation reactor. Background Art

[0002] Chromium salts are important inorganic chemical products, widely used in chemical, light industry, metallurgy, prevention, machinery and other industries. As a key equipment of the new generation of "chromium iron alkali dissolution oxidation to produce sodium chromate", the oxidation reactor generally uses magnetic seals. High-purity oxygen needs to be introduced during the reaction process, and the reaction itself produces a large amount of hydrogen. Under high temperature and high pressure, the reaction will explode in the reactor after 3-10 hours, resulting in damage to the internal magnetic steel and bearings of the magnetic seal, which terminates the entire reaction process and cannot meet the needs of normal production.

[0003] Therefore, how to provide a high-pressure mechanical sealing device for a chromium-iron alkaline oxidation reactor is a problem that those skilled in the art need to solve urgently. Summary of the invention

[0004] Therefore, the purpose of the present invention is to provide a high-pressure mechanical sealing device for a chromium-iron alkaline oxidation reactor, which solves the problem that the existing magnetic seal fails due to explosion.

[0005] The present invention provides a high-pressure mechanical sealing device for a chromium-iron alkaline oxidation reactor, which is rotatably sealed on a rotating shaft of the reactor, and comprises:

[0006] A cooling flange seat, which is sleeved on the bottom of the rotating shaft and fixed above the reactor flange of the reactor to block the heat transferred upward from the reactor;

[0007] A medium-end static ring seat, wherein the medium-end static ring seat is fixed to the top of the cooling flange seat;

[0008] A double-end mechanical seal part, which is arranged on the top of the medium-end static ring seat through a sealing seat;

[0009] An atmospheric end static ring seat, the atmospheric end static ring seat is fixed on the top of the sealing seat, and a sealing cavity is formed inside the atmospheric end static ring seat, the sealing seat, the double-end mechanical seal part and the medium end static ring seat; and

[0010] A balancing tank, wherein the first port of the balancing tank is connected to the reactor through a pipeline, the second port of the balancing tank is connected to the sealing liquid inlet of the sealed cavity through a pipeline, and the third end of the balancing tank is connected to the sealing liquid outlet of the sealed cavity through a pipeline to maintain the pressure balance in the reactor, the balancing tank and the sealed cavity.

[0011] It can be seen from the above technical scheme that, compared with the prior art, the present invention discloses a high-pressure mechanical sealing device for a chromium-iron alkaline oxidation reactor, in which a balance tank is connected with the inside of the reactor and the inside of the mechanical seal, thereby ensuring that the internal pressure of the double-end faces of the mechanical seal is consistent with the pressure in the reactor, thereby extending the sealing life.

[0012] Furthermore, the cooling flange seat has a jacket inside, and the cooling flange seat is provided with a cooling water inlet and a cooling water outlet which are in communication with the jacket.

[0013] Furthermore, a throttling sleeve is arranged between the cooling flange seat and the rotating shaft.

[0014] Furthermore, an upwardly protruding annular boss is arranged inside the static ring seat at the medium end, and a downwardly recessed annular groove is arranged at the position of the rotating shaft corresponding to the annular boss, and the annular boss and the annular groove are plugged into each other to form a certain floating gap; a flushing liquid inlet is opened on one side of the static ring seat at the medium end, and the sealing liquid inlet is arranged on the other side of the static ring seat at the medium end.

[0015] Furthermore, a monitoring port for monitoring the pressure of the sealing cavity is provided on the atmospheric end static ring seat; the sealing liquid outlet is arranged on the atmospheric end static ring seat and is staggered with the monitoring port.

[0016] Furthermore, the double-end mechanical seal part includes an atmospheric end static ring, a medium end static ring, a medium end dynamic ring and an atmospheric end dynamic ring. The medium end static ring is fixed to the top of the medium end static ring seat, the atmospheric end static ring is fixed to the bottom of the atmospheric end static ring seat, and the medium end dynamic ring and the atmospheric end dynamic ring are fixed to the rotating shaft by screws.

[0017] Furthermore, a condenser is arranged between the double-end mechanical seal and the seal seat, and a condensate inlet and a condensate outlet connected to the condenser are arranged on the double-end mechanical seal. A flushing and cooling device is designed on the seal seat of the mechanical seal to ensure that the explosive hydrogen and oxygen cannot reach the seal end face, solving the problem of hydrogen and oxygen explosion at the bottom of the seal. This completely solves the problem of failure of the original magnetic seal due to explosion.

[0018] Furthermore, a protective seal is arranged between the atmospheric end static ring seat and the rotating shaft, a sealing sleeve is installed on the rotating shaft corresponding to the protective seal, and the sealing sleeve and the protective seal form an emergency sealing device.

[0019] Furthermore, normally open valves are installed on the pipelines corresponding to the first port, the second port and the third port of the balancing tank, and a pressure relief pipeline extends from the pipeline corresponding to the first port thereof, and a normally closed valve is arranged on the pressure relief pipeline.

[0020] Furthermore, a bearing seat is fixed on the top of the atmospheric end static ring seat, and angular contact tapered roller bearings and deep groove ball bearings are installed from top to bottom between the bearing seat and the rotating shaft; a lubrication filling channel is opened at the position of the bearing seat corresponding to the bearing hole, and the lubrication filling channel is connected to a vertically arranged liquid level oil cup; an annular water flow channel is provided on the outer wall of the bearing seat, and the water flow channel has a cooling inlet and a cooling outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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 embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0022] Figure 1 The accompanying drawing is a schematic structural diagram of a high-pressure mechanical sealing device for a chromium-iron alkaline oxidation reactor provided by the present invention;

[0023] Figure 2 The accompanying drawing shows a partial structural schematic diagram of a high-pressure mechanical sealing device for a chromium-iron alkaline oxidation reactor provided by the present invention;

[0024] Figure 3 The accompanying drawings show Figure 2 A magnified schematic diagram of part A in FIG.

[0025] Figure 4 The accompanying drawing shows a schematic diagram of the structure of the protective seal;

[0026] Figure 5 The accompanying drawing shows a schematic diagram of a throttle sleeve;

[0027] In the figure: 100-rotating shaft, 101-sealing sleeve, 200-cooling flange seat, 201-cooling water inlet, 202-cooling water outlet, 203-throttling sleeve, 2031-damping spring, 300-medium end static ring seat, 301-sealing liquid inlet, 302-annular boss, 303-flushing liquid inlet, 400-double-end mechanical seal, 401-sealing seat, 402-atmospheric end static ring, 403-medium end static ring, 404-medium end dynamic ring, 405-atmospheric end dynamic ring, 406-condenser, 407-condensate inlet, 408-condensate outlet, 500-atmospheric end static ring seat, 501-sealing liquid outlet , 502-monitoring port, 503-protective seal, 5031-energy storage seal, 5032-upper end cover, 5033-screw, 5034-lower end cover, 5035-skeleton oil seal, 5036-U-type spring, 600-balance tank, 601-normally open valve, 602-normally closed valve, 700-bearing seat, 701-angular contact tapered roller bearing, 702-deep groove ball bearing, 703-lubrication filling channel, 704-liquid level oil cup, 705-water flow channel, 706-cooling inlet, 707-cooling outlet, 800-bearing pressure cover, 801-exhaust hole, 802-slider, 803-compression spring. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] See attached Figure 1-3 The embodiment of the present invention discloses a high-pressure mechanical sealing device for a chromium iron alkali oxidation reactor, which is rotatably sealed on a rotating shaft 100 of the reactor, and includes: a cooling flange seat 200, which is sleeved on the bottom of the rotating shaft 100 and fixed above the reactor flange of the reactor, and is used to block the heat transferred upward from the reactor; a medium end stationary ring seat 300, which is fixed to the top of the cooling flange seat 200; a double-end mechanical sealing part 400, which is arranged on the medium end stationary ring seat 300 through a sealing seat 401. The top portion; the atmospheric end static ring seat 500, the atmospheric end static ring seat 500 is fixed on the top of the sealing seat 401, the atmospheric end static ring seat 500, the sealing seat 401, the double-end mechanical seal part 400 and the medium end static ring seat 300 form a sealed cavity inside; and a balance tank 600, the first port of the balance tank 600 is connected to the reactor through a pipeline, the second port thereof is connected to the sealing liquid inlet 301 of the sealing cavity through a pipeline, and the third end thereof is connected to the sealing liquid outlet 501 of the sealing cavity through a pipeline, so as to keep the pressure balance in the reactor, the balance tank 600 and the sealing cavity. The present invention discloses a high-pressure mechanical sealing device for a chromium iron alkali oxidation reactor, the balance tank is in communication with the inside of the reactor and the inside of the mechanical seal, so as to ensure that the internal pressure of the double-end faces of the mechanical seal is consistent with the pressure in the reactor, thereby extending the sealing life.

[0033] See attached Figure 2 The cooling flange seat 200 has a jacket inside, and the cooling flange seat 200 is provided with a cooling water inlet 201 and a cooling water outlet 202 connected to the jacket. It is used to isolate the heat in the reactor and prevent the heat from being transferred to the upper mechanical seal position, thereby protecting the mechanical seal device.

[0034] Advantageously, in one embodiment of the present invention, see attached Figure 2 and 5A throttling sleeve 203 is arranged between the cooling flange seat 200 and the rotating shaft 100. A rectangular annular tooth 2031 is provided in the inner hole of the throttling sleeve in contact with the rotating shaft. The inner hole of the rectangular tooth of the throttling sleeve and the outer circular tooth of the rotating shaft are transitionally matched, and the gap is very small. When the liquid passes through the gap with a very small gap, it cannot pass quickly, which is equivalent to the valve opening very small, and very little liquid passes. The rectangular tooth is equivalent to a throttling ring and has a flow blocking effect, that is, it can control the flushing liquid from the static ring seat at the medium end into the kettle. Since the flushing liquid passing through the throttling ring can only flow downward from the upper part of the kettle, it can prevent the impurities in the lower part from moving upward, and prevent the dust impurities in the kettle from entering the mechanical seal end face at the upper part of the kettle. A damping spring 2032 is correspondingly arranged at the top of the rectangular tooth to further increase the resistance to liquid entry.

[0035] More advantageously, the inner part of the medium end static ring seat 300 is provided with an upwardly protruding annular boss 302, and the rotating shaft 100 is provided with a downwardly concave annular groove corresponding to the position of the annular boss 302, and the annular boss 302 and the annular groove are plugged to form a certain floating gap; a flushing liquid inlet 303 is provided on one side of the medium end static ring seat 300, and the sealing liquid inlet 301 is provided on the other side of the medium end static ring seat 300. There is no direct contact between the annular boss and the annular groove, and the flushing liquid introduced from the flushing liquid inlet on the medium end static ring seat fills the liquid in the liquid level pool formed by the medium end static ring seat and the double end mechanical seal, so that the hydrogen and oxygen that are easy to explode in the kettle cannot reach the end face of the mechanical seal, and enter the groove through the flushing liquid on the static ring seat, which reduces the concentration of hydrogen and oxygen on the one hand, and reduces the temperature of hydrogen and oxygen on the other hand. This method can prevent the gas from reaching the explosion limit and solve the problem of hydrogen and oxygen combustion and explosion at the bottom of the seal.

[0036] See attached Figure 2 The atmospheric end static ring seat 500 is provided with a monitoring port 502 for monitoring the pressure of the sealing chamber; the sealing liquid outlet 501 is arranged on the atmospheric end static ring seat 500 and is staggered with the monitoring port 502. The sealing liquid of the mechanical seal flows in from the medium end static ring seat and flows out from the atmospheric end static ring seat, which plays a role in lubricating and cooling the mechanical seal. The monitoring port can monitor the operating status and leakage of the seal at any time.

[0037] See attached Figure 3 The double-end mechanical seal part 400 includes an atmospheric end static ring 402, a medium end static ring 403, a medium end dynamic ring 404 and an atmospheric end dynamic ring 405. The medium end static ring 403 is fixed to the top of the medium end static ring seat 300, the atmospheric end static ring 402 is fixed to the bottom of the atmospheric end static ring seat 500, and the medium end dynamic ring 404 and the atmospheric end dynamic ring 405 are fixed to the rotating shaft 100 by screws.

[0038] In an embodiment of the present invention, a condenser 406 is disposed between the double-end mechanical seal portion 400 and the sealing seat 401, and the double-end mechanical seal portion 400 is provided with a condensate inlet 407 and a condensate outlet 408 connected to the condenser 406, which are used to take away the heat generated by the mechanical seal.

[0039] In another embodiment of the present invention, a protective seal 503 is arranged between the atmospheric end stationary ring seat 500 and the rotating shaft 100, and a sealing sleeve 101 is installed at the rotating shaft 100 corresponding to the protective seal 503, and the sealing sleeve 101 and the protective seal 503 form an emergency sealing device. The protective seal is a composite component, which is composed of an energy storage seal ring 5031, a U-shaped spring 5036, an upper end cover 5032, a lower end cover 5034, screws 5033 and a skeleton oil seal 5035, etc. Figure 4 As shown, the energy storage sealing ring 5031 is installed between the upper end cover 5032 and the lower end cover 5034, and is locked by a screw 5033. The energy storage sealing ring 5031 is designed as a U-shaped mouth, and a U-shaped spring 5036 is installed inside the U-shaped lip. The U-shaped lip is fitted on the sealing sleeve 101 by the U-shaped spring 5036, and under the action of the sealing medium, it can play a high-pressure sealing role. The upper end cover 5032 and the lower end cover 5034 are installed between the atmospheric end static ring seat 500 and the rotating shaft 100 after being buckled. The protective seal is used to overcome the force of the upper U-shaped spring under the action of the pressure in the kettle in the case of mechanical seal failure, and form an emergency sealing device with the sealing sleeve to prevent leakage of the medium in the kettle.

[0040] In other embodiments of the present invention, normally open valves 601 are installed on the pipelines corresponding to the first port, the second port and the third port of the balancing tank 600, and a pressure relief pipeline extends from the pipeline corresponding to the first port thereof, and a normally closed valve 602 is provided on the pressure relief pipeline.

[0041] In other embodiments of the present invention, a bearing seat 700 is fixed on the top of the atmospheric end stationary ring seat 500, and an angular contact tapered roller bearing 701 and a deep groove ball bearing 702 are installed from top to bottom between the bearing seat 700 and the rotating shaft 100, and the bearings are used to ensure the installation accuracy of the double-end mechanical seal and the protective seal; the bearing seat 700 is provided with a lubrication filling channel 703 corresponding to the bearing hole position, and the lubrication filling channel 703 is connected to a vertically arranged liquid level oil cup 704 for filling and displaying the bearing liquid level; the outer wall of the bearing seat 700 is provided with an annular water flow channel 705, and the water flow channel 705 has a cooling inlet 706 and a cooling outlet 707. The function of the water flow channel is to take away the heat generated during the operation of the bearing to prevent the bearing from failing due to excessive temperature.

[0042] The top of the bearing seat is provided with a bearing gland 800, and the bearing gland is provided with an exhaust hole 801 for exhausting the gas in the bearing chamber. A slider 802 is designed under the bearing gland. The slider is a rectangular block, which is directly connected to the bearing gland by screws. The compression spring 803 on the bearing gland acts on the slider. The action of the compression spring here ensures that the end face of the angular contact tapered roller bearing is stressed to prevent the bearing from slipping.

[0043] The top of the rotating shaft is locked with a coupling and then connected to the reducer of the stirring motor.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0045] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A high-pressure mechanical seal device for a chromium-iron alkaline oxidation reactor, which is rotatably sealed on a rotating shaft (100) of the reactor, characterized in that: include: A cooling flange seat (200), the cooling flange seat (200) being sleeved on the bottom of the rotating shaft (100) and fixed above the kettle mouth flange of the reactor, and being used to block the heat transferred upward from the reactor; A medium-end stationary ring seat (300), wherein the medium-end stationary ring seat (300) is fixed to the top of the cooling flange seat (200); A double-end-face mechanical seal portion (400), the double-end-face mechanical seal portion (400) being arranged on the top of the medium-end stationary ring seat (300) via a sealing seat (401); An atmospheric end static ring seat (500), the atmospheric end static ring seat (500) being fixed on the top of the sealing seat (401), and a sealing cavity being formed inside the atmospheric end static ring seat (500), the sealing seat (401), the double-end mechanical seal part (400) and the medium end static ring seat (300); and A balancing tank (600), wherein a first port of the balancing tank (600) is connected to the reaction kettle via a pipeline, a second port of the balancing tank (600) is connected to the sealing liquid inlet (301) of the sealed cavity via a pipeline, and a third end of the balancing tank (600) is connected to the sealing liquid outlet (501) of the sealed cavity via a pipeline, so as to maintain pressure balance in the reaction kettle, the balancing tank (600) and the sealed cavity; An upwardly protruding annular boss (302) is provided inside the medium-end stationary ring seat (300); a downwardly recessed annular groove is provided on the rotating shaft (100) at a position corresponding to the annular boss (302); the annular boss (302) and the annular groove are plugged into each other to form a certain floating gap; a flushing liquid inlet (303) is provided on one side of the medium-end stationary ring seat (300); and a sealing liquid inlet (301) is provided on the other side of the medium-end stationary ring seat (300); The atmospheric end static ring seat (500) is provided with a monitoring port (502) for monitoring the pressure of the sealing chamber; the sealing liquid outlet (501) is arranged on the atmospheric end static ring seat (500) and is staggered with the monitoring port (502); The double-end mechanical seal part (400) comprises an atmospheric end static ring (402), a medium end static ring (403), a medium end dynamic ring (404) and an atmospheric end dynamic ring (405); the medium end static ring (403) is fixed to the top of the medium end static ring seat (300); the atmospheric end static ring (402) is fixed to the bottom of the atmospheric end static ring seat (500); and the medium end dynamic ring (404) and the atmospheric end dynamic ring (405) are fixed to the rotating shaft (100) by screws.

2. A high-pressure mechanical sealing device for a ferrochrome alkaline oxidation reaction kettle according to claim 1, characterized in that: The cooling flange seat (200) has a jacket inside, and the cooling flange seat (200) is provided with a cooling water inlet (201) and a cooling water outlet (202) which are in communication with the jacket.

3. The high-pressure mechanical sealing device for a chromium-iron alkaline oxidation reaction kettle according to claim 1, characterized in that: A throttling sleeve (203) is provided between the cooling flange seat (200) and the rotating shaft (100).

4. The high-pressure mechanical sealing device for a chromium-iron alkaline oxidation reactor according to claim 1, characterized in that: A condenser tube (406) is disposed between the double-end mechanical seal portion (400) and the sealing seat (401), and a condensate inlet (407) and a condensate outlet (408) which are in communication with the condenser tube (406) are disposed on the double-end mechanical seal portion (400).

5. The high-pressure mechanical sealing device for a ferrochrome alkaline oxidation reactor according to claim 1, characterized in that: A protective seal (503) is arranged between the atmospheric end static ring seat (500) and the rotating shaft (100), and a sealing sleeve (101) is installed on the rotating shaft (100) at a position corresponding to the protective seal (503), and the sealing sleeve (101) and the protective seal (503) form an emergency sealing device.

6. A high-pressure mechanical sealing device for a ferrochrome alkaline oxidation reactor according to any one of claims 1 to 5, characterized in that: Normally open valves (601) are installed on pipelines corresponding to the first port, the second port and the third port of the balancing tank (600), and a pressure relief pipeline extends from the pipeline corresponding to the first port thereof, and a normally closed valve (602) is arranged on the pressure relief pipeline.

7. A high-pressure mechanical sealing device for a ferrochrome alkaline oxidation reactor according to any one of claims 1 to 5, characterized in that: A bearing seat (700) is fixed on the top of the atmospheric end static ring seat (500), and an angular contact tapered roller bearing (701) and a deep groove ball bearing (702) are installed from top to bottom between the bearing seat (700) and the rotating shaft (100); a lubrication filling channel (703) is opened at a position corresponding to the bearing hole of the bearing seat (700), and the lubrication filling channel (703) is connected to a vertically arranged liquid level oil cup (704); an annular water flow channel (705) is provided on the outer wall of the bearing seat (700), and the annular water flow channel (705) has a cooling inlet (706) and a cooling outlet (707).

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