Air separation rectifying tower leakage detection device

Abstract

The utility model discloses a leakage detection device for an air separation rectifying tower, which belongs to the technical field of air separation rectifying towers, and comprises a cold box and an air separation rectifying tower body arranged in an inner cavity of the cold box, air collecting pipes are arranged outside the air separation rectifying tower body, and the air collecting pipes are uniformly distributed outside the air separation rectifying tower body. When the air separation rectifying tower body works, if gas leakage occurs, the leaked gas rises to the position of the gas collecting pipe, and the gas enters the transmission pipe from the gas inlet and is transmitted to the detection position for transmission, so that the gas leakage of the air separation rectifying tower body can be mastered in time, the normal work of the air separation rectifying tower body is ensured, and accidents are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of air separation and rectification towers, and in particular relates to a leakage detection device for air separation and rectification towers. Background Art

[0002] The air separation unit is a set of industrial equipment used to separate the various gas components in the air and produce oxygen, nitrogen, argon and other gases of the air components. The most commonly used air separation method is cryogenic distillation. The cryogenic separation method converts air into liquid through the method of compression cycle deep freezing. Through cryogenic distillation, the equipment gradually separates and produces inert gases such as oxygen, nitrogen and argon from the liquid air according to different boiling points. It is widely used in traditional metallurgy, new coal chemical industry, large-scale nitrogen fertilizer, professional gas supply and other fields. The distillation tower of the air separation unit is isolated by a cold box made of steel plate. Pearl sand is filled between the distillation tower and the cold box and filled with nitrogen for cold protection.

[0003] In the current existing technology, the method for gas leakage detection is: a pressure and sampling detection point is set at the lower, middle and upper parts of the cold box. If a leak occurs in the distillation tower, the leakage position and leakage medium of the distillation tower can only be roughly judged through the pressure changes in the lower, middle and upper parts of the cold box and the sampling analysis results of the sampling detection points and the frost on the outer wall of the cold box. The leakage position and leakage medium of the distillation tower cannot be quickly determined, which greatly increases the difficulty and time-consumingness of the maintenance work and poses a great safety risk. Utility Model Content

[0004] The utility model aims to provide an air separation distillation tower leakage detection device to solve the technical problem that the leakage position and leakage medium of the distillation tower can be roughly determined but the leakage position and leakage medium of the distillation tower cannot be quickly determined in the background technology.

[0005] To achieve the above purpose, the specific technical scheme of the utility model is as follows: an air separation distillation tower leakage detection device, comprising

[0006] A cold box, and an air separation distillation tower body arranged in the inner cavity of the cold box, wherein an air collection pipe is arranged outside the air separation distillation tower body, and the air collection pipes are evenly distributed outside the air separation distillation tower body;

[0007] The air collecting pipe comprises a distribution ring pipe distributed outside the air separation distillation tower body and a transmission pipe installed on one side of the distribution ring pipe. The lower end of the distribution ring pipe is provided with an air inlet for gas to enter, and the lower end of the air inlet is provided with a filter part.

[0008] Preferably, the outside of the air separation distillation tower body is filled with pearlescent sand, the pearlescent sand is filled in the gap between the inside of the cold box and the outside of the air separation distillation tower body, and the outside of the air collection pipe is covered with pearlescent sand.

[0009] Preferably, the filter part includes a filter screen and a mounting head installed on the upper end of the filter screen for fixing the filter screen, the mounting head is installed to the air inlet position through a flange, filter cotton is arranged inside the filter screen, and a fixing plate is arranged at the lower end of the filter screen.

[0010] Preferably, the side surfaces of the filter cotton are distributed in a Z-shape, and a supporting skeleton is provided inside the filter cotton.

[0011] Preferably, an air charging box is provided on one side of the lower end of the cold box for inflating the interior of the cold box.

[0012] Preferably, one end of the transmission pipe is arranged through the outer wall of the cold box and is transmitted downward to the interior of the detection box arranged on one side of the lower end of the cold box.

[0013] Preferably, a detection unit is provided at the lower end of the transmission pipe, a bypass pipe is provided at one side of the end of the transmission pipe, and the bypass pipe is connected to the inflation main pipe.

[0014] Preferably, the upper ends of the inflation main pipe and the bypass pipe are both provided with a first stop valve and a second stop valve, the first stop valve at the upper end of the inflation main pipe is used to control the total gas entry, and the second stop valve is used to control the gas entry into the bypass pipe.

[0015] The utility model of an air separation distillation tower leakage detection device has the following advantages:

[0016] The leakage detection device for an air separation distillation tower, when the air separation distillation tower body is working, if gas leakage occurs, the leaked gas rises to the air receiving pipe position, and the gas enters the transmission pipe from the air inlet and is transmitted to the detection position for transmission, so that the gas leakage of the air separation distillation tower body can be timely grasped, and the leakage position can be judged according to the concentration of the leaked gas, so as to ensure the normal operation of the air separation distillation tower body and avoid accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

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

[0019] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the utility model;

[0020] Figure 3This is a schematic diagram of the internal structure of the cold box of the utility model;

[0021] Figure 4 This is a schematic diagram of the air collection pipe structure of the utility model;

[0022] Figure 5 This is a schematic diagram of the filter structure of the utility model;

[0023] Figure 6 This is a schematic diagram of the transmission pipe installation structure of the utility model;

[0024] Figure 7 This is a schematic diagram of the internal structure of the detection box of the utility model.

[0025] Explanation of the marks in the figure: 100, cold box; 200, charging box; 300, air separation distillation tower body; 400, air collection pipe; 410, distribution ring pipe; 420, transmission pipe; 430, air inlet; 440, filter part; 441, filter screen; 442, installation head; 443, filter cotton; 444, fixing plate; 450, detection box; 451, detection part; 452, second stop valve; 453, charging main pipe; 454, first stop valve; 500, pearl sand part. DETAILED DESCRIPTION

[0026] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0027] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of 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 embodiments of the present invention.

[0028] 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 embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0029] In the embodiments of the present utility model, 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, an electrical connection, or a communication; 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 embodiments of the present utility model can be understood according to specific circumstances.

[0030] The disclosure below provides many different embodiments or examples for realizing different structures of the embodiments of the present utility model. In order to simplify the disclosure of the embodiments of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present utility model. In addition, the embodiments of the present utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0031] In order to better understand the purpose, structure and function of the utility model, the following is a further detailed description of an air separation distillation tower leakage detection device of the utility model in conjunction with the accompanying drawings.

[0032] like Figure 1-Figure 4 As shown, an air separation distillation tower leakage detection device of the utility model includes a cold box 100, and an air separation distillation tower body 300 arranged in the inner cavity of the cold box 100, and an air collection pipe 400 for detecting leakage of the air separation distillation tower body 300 is arranged outside the air separation distillation tower body 300, and the air collection pipe 400 is evenly distributed outside the air separation distillation tower body 300.

[0033] The gas collecting pipe 400 includes a distribution ring pipe 410 distributed outside the air separation distillation tower body 300 and a transmission pipe 420 installed on one side of the distribution ring pipe 410 for transmitting the gas to the lower end for detection. The lower end of the distribution ring pipe 410 is provided with an air inlet 430 for gas to enter, and the lower end of the air inlet 430 is equipped with a filter part 440 through a flange to prevent external substances from entering the interior of the air inlet 430.

[0034] When the air separation distillation tower body 300 is working, if gas leakage occurs, the leaked gas rises to the position of the gas collecting pipe 400, and the gas enters the transmission pipe 420 from the air inlet 430 and is transmitted to the detection position for transmission, so as to facilitate timely grasp of the gas leakage of the air separation distillation tower body 300, ensure the normal operation of the air separation distillation tower body 300, and avoid accidents.

[0035] Furthermore, the outside of the air separation distillation tower body 300 is filled with a pearlescent sand portion 500 for cold preservation and protection. The pearlescent sand portion 500 is filled in the gap between the inside of the cold box 100 and the outside of the air separation distillation tower body 300, and the outside of the air collection pipe 400 is covered with the pearlescent sand portion 500 to keep the internal air separation distillation tower body 300 cold.

[0036] Furthermore, an inflation box 200 for inflating the interior of the cold box 100 is provided on one side of the lower end of the cold box 100. The inflation box 200 is used to inflate the interior of the cold box 100. The inflation gas may be nitrogen. Its function is to ensure that the interior of the cold box 100 is in a slightly positive pressure state, thereby ensuring that the interior of the cold box 100 is in an inert gas protection and dry environment state, and at the same time facilitates the upward transmission of the leaked gas, which is transmitted through the air inlet 430 for detection.

[0037] like Figure 5 As shown, the filter part 440 includes a filter screen 441 for isolating external substances and a mounting head 442 installed on the upper end of the filter screen 441 for fixing the filter screen 441, the mounting head 442 is installed to the air inlet 430 through a flange, and the interior of the filter screen 441 is provided with filter cotton 443 for filtering the incoming gas, and the lower end of the filter screen 441 is provided with a fixing plate 444 for installing and fixing the upper filter screen 441.

[0038] When the leaked gas diffuses to the distribution ring pipe 410, the filter screen 441 of the filter part 440 blocks the external pearl sand part 500, and the filter cotton 443 filters the internal pearl sand impurities and dust to prevent the pearl sand from entering the distribution ring pipe 410 and causing the pipe body to be blocked.

[0039] Furthermore, the side surfaces of the filter cotton 443 are distributed in a Z-shape, and dust can be stored in the groove of the filter cotton 443 . A supporting skeleton is provided inside the filter cotton 443 to prevent the filter cotton 443 from shrinking and deforming.

[0040] like Figure 6-Figure 7 As shown, one end of the transmission pipe 420 passes through the outer wall of the cold box 100 and is transmitted downward to the interior of the detection box 450 arranged on one side of the lower end of the cold box 100. The lower end of the transmission pipe 420 is provided with a detection part 451 for detecting the gas inside the transmission pipe 420.

[0041] A gas detection probe for detecting gas composition is arranged inside, and it is transmitted to the central control unit wirelessly. A bypass pipe is arranged on one side of the end of the transmission pipe 420, and the bypass pipe is connected to the inflation main pipe 453. The upper ends of the inflation main pipe 453 and the bypass pipe are arranged with a first stop valve 454 and a second stop valve 452 for controlling the inlet and outlet of gas. The first stop valve 454 at the upper end of the inflation main pipe 453 is used to control the total gas entry, and the second stop valve 452 is used to control the gas entry into the bypass pipe.

[0042] After the air separation distillation tower body 300 has been working for a period of time, the first stop valve 454 can be opened to fill nitrogen into the inflation main pipe 453. The second stop valve 452 can be opened in sequence as needed to inflate the inside of the transmission pipe 420 one by one, and the air inlet 430 can be backflushed to prevent the filter part 440 at the air inlet 430 from being blocked and condensed, which would affect the air intake operation.

[0043] A working principle of a leakage detection device for an air separation distillation tower: when the air separation distillation tower body 300 is working, if gas leakage occurs, the leaked gas rises to the position of the gas collecting pipe 400, and the gas enters the transmission pipe 420 from the air inlet 430 and is transmitted to the detection position for transmission, so as to facilitate timely grasp of the gas leakage of the air separation distillation tower body 300, ensure the normal operation of the air separation distillation tower body 300, and avoid accidents.

[0044] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. An air separation distillation tower leakage detection device, characterized in that: include A cold box, and an air separation distillation tower body arranged in the inner cavity of the cold box, wherein an air collection pipe is arranged outside the air separation distillation tower body, and the air collection pipes are evenly distributed outside the air separation distillation tower body; The air collecting pipe comprises a distribution ring pipe distributed outside the air separation distillation tower body and a transmission pipe installed on one side of the distribution ring pipe. The lower end of the distribution ring pipe is provided with an air inlet for gas to enter, and the lower end of the air inlet is provided with a filter part.

2. The air separation distillation tower leakage detection device according to claim 1, characterized in that: The outside of the air separation distillation tower body is filled with pearlescent sand, the pearlescent sand is filled in the gap between the inside of the cold box and the outside of the air separation distillation tower body, and the outside of the air receiving pipe is covered with pearlescent sand.

3. The air separation distillation tower leakage detection device according to claim 2, characterized in that: The filter part includes a filter screen and a mounting head installed on the upper end of the filter screen for fixing the filter screen, the mounting head is installed to the air inlet position through a flange, filter cotton is arranged inside the filter screen, and a fixing plate is arranged at the lower end of the filter screen.

4. The air separation distillation tower leakage detection device according to claim 3, characterized in that: The side surfaces of the filter cotton are distributed in a Z-shape, and a supporting skeleton is arranged inside the filter cotton.

5. The air separation distillation tower leakage detection device according to claim 4, characterized in that: An air charging box is arranged on one side of the lower end of the cold box for inflating the interior of the cold box.

6. The air separation distillation tower leakage detection device according to claim 5, characterized in that: One end of the transmission pipe passes through the outer wall of the cold box and is transmitted downward to the interior of the detection box arranged at one side of the lower end of the cold box.

7. The air separation distillation tower leakage detection device according to claim 6, characterized in that: A detection unit is arranged at the lower end of the transmission pipe, and a bypass pipe is arranged at one side of the end of the transmission pipe, and the bypass pipe is connected to the inflation main pipe.

8. The air separation distillation tower leakage detection device according to claim 7, characterized in that: The upper ends of the inflation main pipe and the bypass pipe are both provided with a first stop valve and a second stop valve. The first stop valve at the upper end of the inflation main pipe is used to control the total gas entering, and the second stop valve is used to control the gas entering the bypass pipe.

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