Air separation cold box burst protection structure

Abstract

The utility model relates to the technical field of use of air separation cold boxes, in particular to an air separation cold box burst protection structure which comprises an outer protection panel, an inner supporting frame is arranged in the outer protection panel, a plurality of gap areas are arranged on the inner supporting frame, a protection assembly is arranged in one gap area, and the outer protection panel is provided with a protection cover. When the pressure in the air separation cold box rises sharply, the gap area where the preset protection assembly is located is a structural weak point, the gap area is broken first under a specific pressure threshold value due to the material strength or the design, and a pressure release channel is formed; part of high-pressure gas is exhausted through explosion of the weak points, so that the pressure burden of the inner supporting frame is relieved, the high-pressure gas is rapidly released through controllable explosion, pearlife is guided to be sprayed to a designated safety area, overall explosion of the cold box is avoided, damage caused by explosion shock waves and fragment splashing is reduced, and safety of a main frame and equipment is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to air separation cold box use technical field, concretely relates to a kind of air separation cold box burst protection structure. BACKGROUND

[0002] At present, in air separation technology, internal compression process is widely used, that is, oxygen, nitrogen and argon products are led out from the fractionating column in the form of liquid nitrogen, then pressurized to the required pressure of the products by low-temperature liquid pump, and finally delivered to the user after reheating by heat exchanger. At the same time, the liquid products can also be directly sent out. In this way, there will be a large amount of high-pressure low-temperature liquid pipelines in the cold box. At the same time, due to thermal expansion and contraction of equipment and pipelines, pipeline deformation, condensation and falling of pearl sand, etc., it is inevitable to cause pipeline rupture and liquid leakage. Due to the rapid gasification of low-temperature liquid, the pressure in the cold box will rise sharply, and at this time, the cold box may suddenly burst. The burst position is not specific, and it may be towards the main control room or the plant area, which poses a great risk to the safety of personnel and equipment. In the later stage of cleaning the site and restarting the equipment, a lot of time will be wasted, so it is necessary to make improvements. SUMMARY

[0003] The utility model aims at overcoming the technical problems in the prior art that the burst of pearl sand cannot be determined from which position, which leads to burying personnel and equipment, and the inability to quickly restart production, and provides an air separation cold box burst protection structure to solve the above problems.

[0004] The utility model is implemented in the following way: an air separation cold box burst protection structure includes an outer protection panel, an inner support frame is arranged in the outer protection panel, a plurality of gap regions are arranged on the inner support frame, a protection assembly is arranged at one of the gap regions, and the gap region at this position will burst first when the air separation cold box is subjected to sharp overpressure.

[0005] Preferably, the protection assembly includes a steel plate fixedly connected to the side wall of the gap region, a first thick panel is connected to the upper end of the steel plate through a connecting piece, a thick steel belt is hingedly connected to the steel plate, and a second thick panel is arranged on the side surface of the thick steel belt.

[0006] Preferably, the thickness of the first thick panel is 5 mm, the thickness of the thick steel belt is 60 mm, and the thickness of the second thick panel is 2 mm.

[0007] Preferably, the protection assembly is arranged symmetrically in the gap region.

[0008] Preferably, a plurality of protection assemblies are arranged side by side in the gap region.

[0009] The utility model has the following beneficial effects:

[0010] 1. The air separation cold box burst protection structure, when the pressure in the air separation cold box rises sharply, the gap area where the preset protection assembly is located is a structural weak point, the material strength or design allows it to break first at a certain pressure threshold, forming a pressure release channel, and part of the high-pressure gas is discharged through the burst of these weak points, thereby reducing the pressure burden of the internal support frame, quickly releasing high-pressure gas through controllable burst, and guiding the pearlite to the designated safety area, avoiding the explosion of the cold box as a whole, reducing the hazards of explosion shock wave and debris splashing, and ensuring the safety of the main frame and equipment.

[0011] 2. When the internal pressure of the cold box exceeds, the pressure first acts on the first thick panel to form an initial pressure relief channel, and if the pressure exceeds the bearing threshold of the connecting piece, the continuously rising pressure pushes the thick steel belt to rotate around the hinge point, driving the second thick panel to flip outward. The second thick panel breaks first under the action of centrifugal force and pressure due to its lower connection strength than the main structure, forming a secondary pressure relief port, and the separation of the first thick panel and the breakage of the second thick panel form two-stage pressure release, prolonging the pressure relief time and reducing the instantaneous shock wave intensity. The rotation direction of the thick steel belt can guide the airflow to the preset safety area for discharge, reducing the range of debris splashing, and converting the instantaneous high pressure into a sustained airflow through the two-stage pressure relief structure, reducing the impact load on the cold box structure and prolonging the service life of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings described below are only one embodiment of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0013] Figure 1 It is an overall structure schematic diagram of the outer protection panel of the present application.

[0014] Figure 2 It is an overall structure schematic diagram of the internal support frame of the present application.

[0015] Figure 3 It is a structure schematic diagram of the protection assembly before being broken of the present application.

[0016] Figure 4 It is a structure schematic diagram of the protection assembly after being broken of the present application.

[0017] The marks in the drawings are:

[0018] 1, outer protective panel; 2, inner support frame; 3, gap area; 4, protection assembly; 41, steel plate; 42, connecting piece; 43, first thick panel; 44, thick steel strip; 45, second thick panel. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, purposes and effects of the utility model easy to understand, the following will make a clear and complete description of the technical scheme in the specific embodiment of the utility model, so as to further illustrate the utility model. Obviously, the specific embodiment described is only a part of the embodiment of the utility model, not all.

[0020] The following will be described in detail in combination with the accompanying drawings Figures 1-4 The utility model will be further described in detail.

[0021] Embodiment 1:

[0022] A kind of air separation cold box burst protection structure, including outer protective panel 1, inner support frame 2 is equipped in outer protective panel 1, inner support frame 2 is equipped with several gap areas 3, wherein a gap area 3 is installed with protection assembly 4, so that air separation cold box sharply overpressure when this gap area 3 position first burst, guide pearlite is sprayed to specified safety area, both can protect the safety of personnel and equipment, also conducive to the rapid resumption of work of factory.

[0023] Specific application, in combination with the entire factory layout, first select the position of air separation cold box, then in road side or open area, select as cold box pressure relief direction, here need to consider first that pressure relief direction must not have operating room or high value device, when the pressure in air separation cold box sharply rises, the gap area 3 where preset protection assembly 4 is weak point of structure, its material strength or design allows first breakage under specific pressure threshold, forms pressure release channel, part of high-pressure gas is discharged through the burst of these weak points, to reduce the pressure burden of inner support frame 2, through controllable burst rapid release of high-pressure gas, and guide pearlite is sprayed to specified safety area, avoid the whole cold box explosion, reduce the harm of explosion shock wave and debris splashing, ensure the safety of main frame and equipment.

[0024] In the embodiment, protection assembly 4 includes the steel plate 41 fixedly connected with the side wall of gap area 3, the first thick panel 43 is connected with the upper end of steel plate 41 by connecting piece 42, thick steel strip 44 is hinged on the upper end of steel plate 41, the side of thick steel strip 44 is provided with the second thick panel 45, steel plate 41 is fixed to the side wall of gap area 3, as a basic support structure, the first thick panel 43 is connected with the upper end of steel plate 41 by connecting piece 42, forms rigid plugging under normal working conditions, bears the pressure inside cold box, thick steel strip 44 is hinged in the middle of steel plate 41, can rotate around the hinge point, the second thick panel 45 is fixed to the side of thick steel strip 44, forms movable weak structure.

[0025] When the cold box is over-pressured, the pressure first acts on the first thick panel 43, forming an initial pressure relief channel. If the pressure exceeds the bearing threshold of the connecting piece 42, the continuously rising pressure pushes the thick steel belt 44 to rotate around the hinge point, driving the second thick panel 45 to flip outward. Since the connection strength of the second thick panel 45 and the thick steel belt 44 is lower than that of the main structure, the second thick panel 45 breaks first under the action of centrifugal force and pressure, forming a secondary pressure relief port. The separation of the first thick panel 43 and the rupture of the second thick panel 45 form two-stage pressure release, prolong the pressure relief time, reduce the instantaneous shock wave intensity, the rotation direction of the thick steel belt 44 can guide the airflow to the preset safe area, reduce the range of debris flying; through the two-stage pressure relief structure, the instantaneous high pressure is converted into a sustained airflow, reducing the impact load on the cold box structure and prolonging the service life of the equipment.

[0026] In this embodiment, the thickness of the first thick panel 43 is 5mm, the thickness of the thick steel belt 44 is 60mm, and the thickness of the second thick panel 45 is 2mm. The first thick panel 43 serves as a primary pressure relief threshold control layer, and its thickness is significantly lower than that of the main structure of the air separation cold box. When the internal pressure reaches a preset value (such as 1.1-1.3 times the design pressure), it deforms plastically and breaks first, forming an initial pressure relief channel. The thickness of the thick steel belt 44 is 3-5 times that of the main structure of the cold box, and it has very strong bending stiffness. When the first thick panel 43 breaks, the continuously rising pressure transmits torque through the steel belt hinge point, forcing the thick steel belt 44 to rotate around the hinge point. The second thick panel 45 serves as the ultimate pressure relief layer, and its thickness is only 1 / 5 of the main structure of the cold box, and it is preferably designed with a pre-processed weak groove. When the thick steel belt 44 rotates to a certain angle, the second thick panel 45 tears along the weak groove under the action of centrifugal force and residual pressure, forming a pressure relief port with an area expanded by 3-5 times.

[0027] In this embodiment, the protective assembly 4 is arranged symmetrically up and down in the gap area 3, and a plurality of protective assemblies 4 are arranged side by side in the gap area 3, improving the pressure relief effect in the gap area 3.

[0028] The utility model discloses a working principle: a kind of air separation cold box burst protection structure, specific application, in combination with the floor plan of entire factory building, first select the position of air separation cold box, then in road side or open area, select as the pressure relief direction of cold box, here need first consider that the pressure relief direction must not have operating room or high value device, when the pressure of air separation cold box inside sharply rises, the gap area 3 where preset protection component 4 is weak point of structure, its material strength or design allows to break first under specific pressure threshold, forms pressure release passage, part high-pressure gas is discharged through the burst of these weak points, to reduce the pressure burden of inner support frame 2, through controllable burst rapid release high-pressure gas, and guide pearlite to specified safety area, avoid cold box whole body explosion, reduce the harm of explosion shock wave and fragment splashing, ensure the safety of main frame and equipment;Specifically when overpressure in cold box, pressure first acts on first thick panel 43, forms initial pressure relief passage.If pressure exceeds the bearing threshold of connecting piece 42, the pressure that continuously rises pushes thick steel band 44 to rotate around hinged point, drives second thick panel 45 to overturn to outside. Because the connecting strength of second thick panel 45 and thick steel band 44 is lower than main structure, under the action of centrifugal force and pressure, break first, form secondary pressure relief port, the separation of first thick panel 43 and the rupture of second thick panel 45 form two-stage pressure release, extend pressure relief time, reduce instantaneous shock wave intensity, the rotation direction of thick steel band 44 can guide airflow to discharge to preset safety area, reduce fragment splashing range;Through two-stage pressure relief structure, instantaneous high pressure is converted into continuous airflow, reduce the impact load that cold box structure bears, prolong equipment life.

[0029] It should be noted that, according to the needs of implementation, each component described in the embodiments of the utility model can be split into more components, or two or more components or parts of components can be combined into new components to achieve the purpose of the embodiments of the utility model. The above embodiments only express several implementation ways of the utility model, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the utility model patent. It should be noted that, for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which are within the scope of protection of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A burst protection structure for an air separation cold box, characterized in that: It includes an outer protective panel (1), an inner support frame (2) is provided inside the outer protective panel (1), and a number of gap areas (3) are provided on the inner support frame (2). A protective component (4) is provided at one of the gap areas (3), so that the gap area (3) will burst first when the air separation cold box is rapidly overpressurized.

2. The air separation cold box explosion protection structure according to claim 1, characterized in that: The protective component (4) includes a steel plate (41) fixedly connected to the side wall of the gap area (3). The upper end of the steel plate (41) is connected to a first thick panel (43) via a connector (42). A thick steel strip (44) is hinged on the steel plate (41), and a second thick panel (45) is provided on the side of the thick steel strip (44).

3. The air separation cold box explosion protection structure according to claim 2, characterized in that: The thickness of the first thick panel (43) is 5 mm, the thickness of the thick steel strip (44) is 60 mm, and the thickness of the second thick panel (45) is 2 mm.

4. The air separation cold box explosion protection structure according to claim 1, characterized in that: The protective components (4) are arranged symmetrically in the gap area (3).

5. The air separation cold box explosion protection structure according to claim 1, characterized in that: Several protective components (4) are arranged side by side in the gap area (3).

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