Safety valve pressure relief device for alkali-containing medium pressure vessel

Abstract

The utility model discloses a safety valve pressure relief device for an alkali-containing medium pressure vessel. The safety valve pressure relief device comprises a pressure relief buffer cylinder, a buffer condensation mechanism, a sewage tank and a safety valve emptying pipe, the buffer condensation mechanism is fixedly connected in the pressure relief buffer cylinder and is used for exchanging heat with a high-temperature alkali-containing gas medium and condensing the high-temperature alkali-containing gas medium; the bottom of the pressure relief buffer cylinder is connected with the sewage tank; one end of the safety valve emptying pipe is connected with the middle part of the pressure relief buffer cylinder, and the joint is positioned below the buffer condensation mechanism; the other end of the safety valve emptying pipe is used for being connected with a safety valve of an external pressure container. According to the utility model, the sprayed alkali-containing medium can be cooled and depressurized and can be subjected to gas-liquid separation and recovery, so that the potential safety hazard of personnel injury caused by material spraying is effectively eliminated, and the environmental pollution is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum oxide production equipment, in particular to a safety valve pressure relief device for an alkali-containing medium pressure vessel. Background Art

[0002] In the Bayer process of producing alumina, pressure vessels are used as heating equipment in both the dissolution process and the evaporation process. The dissolution process includes an insulation retention tank, a flash tank, etc., and the evaporation process includes an evaporator, a flash evaporator, etc. The material media contained in these pressure vessels are all strongly alkaline ore slurry or sodium aluminate solution. Since the pressure in the pressure vessel may be too high when the air pressure in the pressure vessel fluctuates or the reaction is too strong, in order to ensure that the pressure vessel can operate safely under a stable pressure state, a safety valve is designed. When the pressure in the pressure vessel is too high, the safety valve will open to release the pressure. Since the original design of the valve outlet pipe is a direct emptying structure, the moment the safety valve is opened, the valve outlet pipe will spray out some gas-liquid mixed alkaline medium from the safety valve outlet, which is easy to cause personal injury and environmental pollution. Therefore, it is necessary to design a safety valve pressure relief device for an alkaline medium pressure vessel to solve the safety hazards and environmental pollution caused by the spraying of the above-mentioned pressure vessel during pressure relief. Utility Model Content

[0003] The utility model provides a safety valve pressure relief device for an alkali medium pressure vessel, which can reduce the temperature and pressure of the sprayed alkali medium and perform gas-liquid separation and recovery, effectively eliminating the potential safety hazard of personnel injury caused by the spraying and reducing environmental pollution.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A safety valve pressure relief device for an alkaline medium pressure vessel, comprising a pressure relief buffer cylinder, a buffer condensation mechanism, a sewage tank and a safety valve drain pipe; the buffer condensation mechanism is fixedly connected to the pressure relief buffer cylinder, and is used to exchange heat with a high-temperature alkaline gas medium and condense it; the bottom of the pressure relief buffer cylinder is connected to the sewage tank; one end of the safety valve drain pipe is connected to the middle of the pressure relief buffer cylinder, and the connection is located below the buffer condensation mechanism; the other end of the safety valve drain pipe is used to be connected to the safety valve of an external pressure vessel.

[0006] Furthermore, the buffer condensation mechanism includes a plurality of baffles and a plurality of discharge pipes; the plurality of baffles are arranged in sequence from bottom to top, and each of the baffles is arranged upwardly and inclined toward the opposite side; one end of each of the baffles is fixedly connected to the inner wall of the pressure relief buffer cylinder; the lowest end of each of the baffles is connected to a discharge pipe.

[0007] Furthermore, one end of the baffle is configured as an arc-shaped structure, and one end of the baffle is matched with and attached to the inner wall of the pressure relief buffer cylinder and is fixed by welding.

[0008] Furthermore, the baffle is concave downward to form a curved surface.

[0009] Furthermore, the top of the feed pipe is connected to the lowest point of the curved surface of the baffle.

[0010] Furthermore, the top of the pressure relief buffer cylinder is open, and the bottom of the pressure relief buffer cylinder gradually shrinks into a funnel shape.

[0011] Furthermore, an annular water collecting groove is provided on the outer peripheral side of the top opening end of the pressure relief buffer cylinder, and the water collecting groove is provided with a water return hole penetrating into the pressure relief buffer cylinder.

[0012] The beneficial effects of the utility model are:

[0013] 1) The utility model is connected to the outlet end of the safety valve of the pressure vessel. When the internal pressure of the pressure vessel is higher than the set value, the safety valve opens, and some high-temperature and high-pressure gas-liquid mixed alkali medium is sprayed out from the outlet of the safety valve and received by the pressure relief buffer cylinder, so as to avoid the alkali medium from splashing everywhere to prevent personal injury and environmental pollution. The liquid is directly collected into the sewage tank through the pressure relief buffer cylinder, and the gas expands its volume instantly when it enters the pressure relief buffer cylinder, and is cooled and depressurized by the baffles arranged at intervals in the condensation mechanism, so that the gas can be quickly condensed and collected along the baffles, and flow down along the discharge pipe through the bottom of the pressure relief buffer cylinder into the sewage tank, and finally return to the production process, so as to achieve the effect of cooling and depressurizing the high-temperature and high-pressure alkali medium and performing gas-liquid separation and recovery, thereby solving the safety hazards and environmental pollution problems caused by spraying when the pressure vessel is depressurized.

[0014] 2) The baffle is concave downward to form an arc surface, which helps to collect the condensed liquid.

[0015] 3) The top of the discharge pipe is connected to the lowest point of the arc surface of the baffle plate, so that the collected condensed liquid can drip along the discharge pipe.

[0016] 4) The gas undergoes secondary expansion when it is discharged from the top opening of the pressure relief buffer cylinder. It will radiate to the surroundings and exchange heat with the outside air, which is prone to secondary condensation at the outlet. A water collection tank can be set to collect the condensed water at the top opening of the pressure relief buffer cylinder to prevent the condensed water from falling and injuring the staff and polluting the environment; the collected condensed water flows back into the pressure relief buffer cylinder through the return hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0018] Figure 1 It is a structural schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a three-dimensional view cut along a vertical bisecting plane of the safety valve exhaust pipe in the utility model;

[0020] Figure ID:

[0021] 1-pressure relief buffer cylinder, 2-buffer condensation mechanism, 3-sewage tank, 4-safety valve drain pipe, 5-water collecting tank, 6-return hole, 7-safety valve, 21-baffle, 22-discharge pipe. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is referred to as being "set in the middle", it does not only mean being set in the middle, as long as it is not set at both ends within the range defined by the middle. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0025] Reference Figure 1 to Figure 2 As shown, a safety valve pressure relief device for an alkali medium pressure vessel comprises a pressure relief buffer cylinder 1, a buffer condensation mechanism 2, a sewage tank 3 and a safety valve drain pipe 4;

[0026] The buffer condensation mechanism 2 is fixedly connected in the pressure relief buffer cylinder 1, and is used to exchange heat with the high-temperature alkaline gas medium and condense it. The buffer condensation mechanism 2 includes a plurality of baffles 21 and a plurality of feed pipes 22; the plurality of baffles 21 are arranged in sequence from bottom to top, and each baffle 21 is arranged upwardly and tilted toward the opposite side; one end of each baffle 21 is fixedly connected to the inner wall of the pressure relief buffer cylinder 1; and the lowest end of each baffle 21 is connected to a feed pipe 22.

[0027] The bottom of the pressure relief buffer cylinder 1 is connected to the sewage tank 3; one end of the safety valve drain pipe 4 is connected to the middle of the pressure relief buffer cylinder 1, and the connection is located below the buffer condensation mechanism 2; the other end of the safety valve drain pipe 4 is used to connect to the safety valve 7 of the external pressure vessel.

[0028] The utility model is connected to the outlet of the safety valve 7 of the pressure vessel. When the internal pressure of the pressure vessel is higher than the set value, 7 opens, and some high-temperature and high-pressure gas-liquid mixed alkali medium is sprayed out from the outlet of the safety valve and received by the pressure relief buffer cylinder 1, so as to avoid the alkali medium from splashing everywhere to prevent personal injury and environmental pollution. The liquid is directly collected into the sewage tank 3 through the pressure relief buffer cylinder 1, and the volume of the gas is instantly expanded when it enters the pressure relief buffer cylinder 1, and is cooled, depressurized and buffered by the baffles 21 arranged at intervals in the condensation mechanism 2, so that the gas can be quickly condensed and collected along the baffles 21, and flow down along the discharge pipe 22 through the bottom of the pressure relief buffer cylinder 1 into the sewage tank 3, and finally return to the production process, so as to achieve the effect of cooling and depressurizing the high-temperature and high-pressure alkali medium and performing gas-liquid separation and recovery, and solve the safety hazards and environmental pollution problems caused by spraying when the pressure vessel is depressurized.

[0029] In this embodiment, the pressure relief buffer cylinder 1 is a cylindrical structure as a whole, and its top is set to be open, and its bottom gradually narrows into a funnel shape. An annular water collecting trough 5 is provided on the outer peripheral side of the top open end of the pressure relief buffer cylinder 1, and the water collecting trough 5 is provided with a return water hole 6 that penetrates into the pressure relief buffer cylinder 1. When the gas is discharged from the top opening of the pressure relief buffer cylinder 1, it undergoes secondary expansion, and will diffuse to the surroundings and contact with the outside air for heat exchange, and secondary condensation is likely to occur at the outlet. The water collecting trough can collect the condensed water discharged from the top opening of the pressure relief buffer cylinder 1 to prevent the condensed water from falling and injuring the staff and polluting the environment; the collected condensed water flows back into the pressure relief buffer cylinder 1 through the return water hole 6. The end of the baffle 21 that fits with the inner wall of the pressure relief buffer cylinder 1 is set to a matching arc structure, which can be matched with the inner wall of the pressure relief buffer cylinder 1 and welded and fixed in an inclined state. The baffle 21 is concave downward into an arc surface, which helps to collect the condensed liquid. The top of the discharge pipe 22 is connected to the lowest point of the arc surface of the baffle 21 so that the collected condensed liquid can drip along the discharge pipe 22 .

[0030] The above embodiments are only used to illustrate the technical solution of the utility model but not to limit it. Any modification or equivalent substitution that does not deviate from the spirit and scope of the utility model shall be included in the scope of the technical solution of the utility model.

Claims

1. A safety valve pressure relief device for an alkali medium pressure vessel, characterized in that: It includes a pressure relief buffer cylinder, a buffer condensation mechanism, a sewage tank and a safety valve drain pipe; the buffer condensation mechanism is fixedly connected to the pressure relief buffer cylinder, and is used to exchange heat with a high-temperature alkaline gas medium and condense it; the bottom of the pressure relief buffer cylinder is connected to the sewage tank; one end of the safety valve drain pipe is connected to the middle part of the pressure relief buffer cylinder, and the connection is located below the buffer condensation mechanism; the other end of the safety valve drain pipe is used to connect to the safety valve of an external pressure vessel.

2. A safety valve pressure relief device for an alkaline medium pressure vessel according to claim 1, characterized in that: The buffer condensation mechanism includes a plurality of baffles and a plurality of discharge pipes; the plurality of baffles are arranged in sequence from bottom to top, and each of the baffles is arranged upwardly and tilted toward the opposite side; one end of each of the baffles is fixedly connected to the inner wall of the pressure relief buffer cylinder; the lowest end of each of the baffles is connected to a discharge pipe.

3. A safety valve pressure relief device for an alkaline medium pressure vessel according to claim 2, characterized in that: One end of the baffle is configured as an arc-shaped structure, and one end of the baffle is matched with and attached to the inner wall of the pressure relief buffer cylinder and is fixed by welding.

4. A safety valve pressure relief device for an alkali medium pressure vessel according to claim 3, characterized in that: The baffle is concave downward to form a curved surface.

5. The safety valve pressure relief device for an alkaline medium pressure vessel according to claim 3, characterized in that: The top of the feed pipe is connected to the lowest point of the arc surface of the baffle.

6. The safety valve pressure relief device for an alkali medium pressure vessel according to claim 1, characterized in that: The top of the pressure relief buffer cylinder is open, and the bottom of the pressure relief buffer cylinder gradually shrinks into a funnel shape.

7. A safety valve pressure relief device for an alkaline medium pressure vessel according to claim 6, characterized in that: An annular water collecting groove is arranged on the outer peripheral side of the top opening end of the pressure relief buffer cylinder, and the water collecting groove is provided with a water return hole penetrating into the pressure relief buffer cylinder.

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