Air separation cold box liquid leakage multi-point detection device

Abstract

The utility model discloses an air separation cold box liquid leakage multi-point detection device, which relates to the technical field of air separation device fractionating tower cold box operation monitoring equipment, and comprises a diversion trench, a connecting pipe, a thermal insulation long cavity, a maintenance hole channel, a low-temperature probe, a fixed bracket and a liquid collection box, the long thermal insulation cavity is vertically fixed to the inner wall of the cold box through a fixing support. More than one overhauling hole channel is vertically formed in the outer wall of the cold box; more than one flow guide groove is vertically arranged in the cold box at equal intervals; the diversion trench surrounds the inner wall of the cold box; the diversion trenches are connected in series through connecting pipes, and the diversion trench at the bottommost part is communicated with a liquid collecting box; at the initial stage of liquid leakage, the temperature is quickly transferred by utilizing the metal characteristics of the diversion trench; when liquid leakage is serious, the flow guide groove can be used for guiding the leaked liquid, and large-area frosting of the cold box caused by the leaked liquid is avoided; leaked liquid can be in contact with the low-temperature probe when flowing along the liquid outlet of the flow guide groove.

Description

Technical Field

[0001] The utility model relates to the technical field of air separation device fractionation tower cold box operation monitoring equipment, in particular to an air separation cold box leakage multi-point detection device. Background Art

[0002] The fractionation tower of the air separation unit is a tower-type vapor-liquid unit for distillation, also known as a distillation tower; the cold box is one of the key equipment of the air separation unit, and the important basis for judging the leakage of the air separation unit is the base temperature of the cold box. At present, most of the leak detection of air separation units is detected by low-temperature probes; by measuring the temperature to detect whether there is leakage; if there is a low-temperature liquid leak in the cold box, the foundation of the cold box will be frozen and cracked, seriously affecting the structural safety of the cold box, when the detected temperature is lower than the normal operating value.

[0003] Due to the large size of the cold box, in order to ensure the accuracy and sensitivity of the detection, multiple low-temperature probe detection points are generally set around the cold box. When setting the detection points, the low-temperature probes are directly inserted into the detection points, and the cables connected to the low-temperature probes are prone to damage. The more detection points there are, the longer the equipment will need to be maintained in the later stages. When the leaked liquid contacts the body of the cold box, it will cause frost on the wall of the cold box. Continuous liquid leakage will also increase the frosting area of ​​the cold box wall. Therefore, the applicant has designed a leakage detection device that can isolate and collect the leaked liquid while detecting points at different heights; this makes it easy to detect leaks in a timely manner and effectively determine the height of the leak. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a multi-point detection device for leakage in an air separation cold box; the device isolates the cables on the rear side of the low-temperature probe, and only allows the low-temperature probe to enter the detection area, thereby protecting the cables of the low-temperature probe; and while utilizing the guide groove to transfer the temperature, the leaked coolant is collected in an isolated manner, thereby avoiding the impact of continued leakage on a wider range.

[0005] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A multi-point detection device for liquid leakage in an air separation cold box, comprising a guide groove, a connecting pipe, a long thermal insulation cavity, an inspection channel, a cryogenic probe, a fixed bracket, and a liquid collecting box; the long thermal insulation cavity is vertically fixed to the inner wall of the cold box by a fixed bracket; one or more inspection channels are vertically opened on the outer wall of the cold box; the inspection channels are connected to the long thermal insulation cavity; the interior of the cold box has more than one guide groove arranged vertically and equidistantly; the guide groove surrounds the inner wall of the cold box, and the inner bottom surface of the guide groove is inclined toward the inspection channel; the guide grooves are connected in series through a connecting pipe, and the guide groove at the bottom is connected to the liquid collecting box; the cryogenic probe passes through the long thermal insulation cavity; the cable of the cryogenic probe remains in the long thermal insulation cavity; the cryogenic probe is embedded in the side wall of the drainage port of the guide groove.

[0007] Preferably, a back plate is fixed to the end of the low-temperature probe, and the back plate is threadedly fixed to the temperature-insulating long cavity.

[0008] Preferably, a card slot is provided on the back of the guide groove, and the guide groove is card-engaged with the temperature-insulating long cavity through the card slot; the guide groove is made of copper.

[0009] Preferably, the fixing bracket is an L-shaped angle steel, which is arranged at both ends of the long insulation cavity and fixed to the inner wall of the cold box; a bottom plate for placing the liquid collecting box is also fixed to the surface of the fixing bracket at the bottom.

[0010] Beneficial effects of the utility model:

[0011] The low-temperature probe is embedded in the guide groove. In the early stage of leakage, the metal properties of the guide groove are used to quickly transfer temperature. When the leakage is serious, the guide groove can also be used to divert the leakage to avoid large-scale frost on the cold box caused by the leakage. When the leakage flows along the drain port of the guide groove, it will also contact the low-temperature probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the utility model.

[0014] Figure 2 It is a side sectional schematic diagram of the internal structure of the utility model.

[0015] Figure 3 It is a partial enlarged structural schematic diagram of the utility model.

[0016] Figure 4It is a schematic diagram of the disassembled structure of the utility model.

[0017] In the figure, there are a guide groove 1, a connecting pipe 2, a long temperature-insulating cavity 3, a maintenance channel 4, a low-temperature probe 5, a back plate 5.1, a fixing bracket 6, a bottom plate 6.1, a liquid collecting box 7, and a cold box 8. DETAILED DESCRIPTION

[0018] like Figure 1-4 As shown, a multi-point detection device for liquid leakage of an air separation cold box 8, wherein the long insulation cavity 3 is vertically fixed to the inner wall of the cold box 8 by a fixing bracket 6, the fixing bracket 6 is an L-shaped angle steel, the fixing bracket 6 is arranged at both ends of the long insulation cavity 3, and is fixed to the inner wall of the cold box 8; a bottom plate 6.1 for placing a liquid collecting box 7 is also fixed on the surface of the fixing bracket 6 at the bottom. More than one inspection channel 4 is vertically opened on the outer wall of the cold box 8, and the inspection channel 4 is connected to the long insulation cavity 3, and the channel is the location for installing a low-temperature probe 5 and for inspection. There are more than one guide groove 1 arranged vertically and equidistantly inside the cold box 8. A low-temperature probe 5 is set at the height of each guide groove 1 for detection. The guide groove 1 is made of copper to facilitate temperature transfer. In addition to the temperature transfer of the material itself, the notch inside the guide groove 1 can carry the guide liquid. The guide groove 1 surrounds the inner wall of the cold box 8 to prevent the leaked liquid from flowing down along the inner wall of the cold box 8. The multi-layer guide groove 1 separates the inner wall of the cold box 8. The inner bottom surface of the guide groove 1 is inclined toward the inspection channel 4. The guide grooves 1 are connected in series through the connecting pipe 2, and the bottom guide groove 1 is connected to the liquid collecting tank 7. The leaked liquid flowing along the inner wall of the cold box 8 enters the guide groove 1 and is finally collected in the liquid collecting tank 7 for storage. The low-temperature probe 5 runs through the long insulation cavity 3; the cable of the low-temperature probe 5 is left in the long insulation cavity 3; the low-temperature probe 5 is embedded in the side wall of the drainage port of the guide groove 1. Furthermore, in order to seal the hole for inserting the low-temperature probe 5 between the long insulation cavity 3 and the flow guide groove 1, a back plate 5.1 is fixed at the end of the low-temperature probe 5, and the back plate 5.1 is threadedly fixed to the long insulation cavity 3. The flow guide groove 1 needs to be fixed, and the fixing method can be to set a card slot on the back of the flow guide groove 1, and the flow guide groove 1 is engaged with the long insulation cavity 3 through the card slot, and then fixed by bolts. If the fixing method is not separately introduced above, it is welded or threaded fastened using the general technical means of technical personnel in the industry.

[0019] The workflow is as follows:

[0020] When a leak occurs inside the cold box 8, once the leaked liquid contacts the inner wall of the cold box 8 and flows, the leaked liquid will reach the guide groove 1 of the corresponding partition, and the leaked liquid in the guide groove 1 will be collected to avoid moving along the inner wall of the cold box 8; after the leaked liquid is collected and reaches the drain port of the guide groove 1, it will contact the low-temperature probe 5. When the leaked liquid is small, the temperature is transmitted to the low-temperature probe 5 through the material of the guide groove 1 itself. After obtaining the temperature data of the low-temperature probe 5 at the corresponding height, the inspector will handle it if the temperature is abnormal.

[0021] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-point detection device for liquid leakage in an air separation cold box, comprising a guide groove, a connecting pipe, a long temperature-insulating cavity, a maintenance channel, a low-temperature probe, a fixing bracket, and a liquid collecting box; characterized in that: The long insulation cavity is vertically fixed to the inner wall of the cold box by a fixed bracket; the outer wall of the cold box is vertically provided with one or more inspection channels; the inspection channels are connected with the long insulation cavity; the interior of the cold box has one or more guide grooves arranged vertically and equidistantly; the guide grooves surround the inner wall of the cold box, and the inner bottom surface of the guide grooves is inclined toward the inspection channel; the guide grooves are connected in series through connecting pipes, and the guide groove at the bottom is connected with the liquid collecting tank; the low-temperature probe passes through the long insulation cavity; the cable of the low-temperature probe remains in the long insulation cavity; the low-temperature probe is embedded in the side wall of the drainage port of the guide groove.

2. The multi-point detection device for liquid leakage in an air separation cold box according to claim 1, characterized in that: A back plate is fixed to the end of the low-temperature probe, and the back plate is threadedly fixed to the temperature-insulating long cavity.

3. The multi-point detection device for liquid leakage in an air separation cold box according to claim 1, characterized in that: A clamping groove is arranged at the back of the guide groove, and the guide groove is clamped and matched with the temperature-insulating long cavity through the clamping groove; the guide groove is made of copper.

4. The multi-point detection device for liquid leakage in an air separation cold box according to claim 1, characterized in that: The fixing bracket is an L-shaped angle steel, which is arranged at both ends of the long insulation cavity and fixed to the inner wall of the cold box; a bottom plate for placing a liquid collecting box is also fixed on the surface of the fixing bracket at the bottom.

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