Sectional measuring device for differential pressure of rectifying tower and method for determining fault part

Abstract

The invention provides a rectifying tower differential pressure segmented measurement device and a method for determining a fault part, the rectifying tower differential pressure segmented measurement device comprises a pressure guiding pipe, one end of the pressure guiding pipe is connected to a first opening hole formed in the side wall of the tower top of a rectifying tower body, and the other end of the pressure guiding pipe extends from the tower top to a second opening hole formed in the side wall of the tower bottom; a plurality of pressure difference pressure guiding openings are formed in the rectifying tower body from the tower top to the tower bottom, and each pressure difference pressure guiding opening is connected with a pressure guiding pipe; according to the invention, the differential pressure condition of each section of the tower can be accurately measured, so that the fault part of the tower can be accurately determined, the fault reason can be judged through comparison with the distribution structure and analogue simulation data of the tower internals, and a reference is provided for formulating a scientific and reasonable device adjustment or maintenance scheme.

Description

Technical Field

[0001] The present invention belongs to the technical field of natural gas treatment processes, and particularly relates to a differential pressure segmented measurement device for a rectifying column and a method for determining a fault location. Background Art

[0002] As an important component separation device in oil and gas exploration and development and refining industries, the operation effect of a rectifying column directly restricts the processing capacity and operation energy consumption of the device. The operating differential pressure of the rectifying column is a direct manifestation of the overall operating effect of the column. When the operating differential pressure of the column exceeds the normal operating upper limit, it proves that liquid accumulation has occurred on the trays or downcomers in some stratified sections inside the column, affecting the separation efficiency and even causing flooding. Some liquids directly enter the downstream device through gas entrainment at the top of the column, affecting the processing load of the device and seriously causing the device to stop and safety accidents. Therefore, the differential pressure measurement of the column is an essential measuring instrument for the rectifying column.

[0003] Existing columns adopt a full-column differential pressure measurement method. Existing differential pressure measurement technical solutions, such as those in the appendix Figure 1 , can only reflect the overall operating conditions of the entire column. Existing differential pressure measurement technical solutions cannot further accurately determine the high differential pressure part and fault location of the rectifying column, and cannot accurately formulate an overhaul plan. Only a plate-by-plate inspection of the entire column can be carried out during shutdown, especially for rectifying columns with a large diameter and high height, resulting in a large workload for overhauling the entire column. At the same time, based on the overhaul strategy of the full-column differential pressure measurement results, during the overhaul period, only the influence of impurity blockage can be effectively investigated and processed. It is not easy to detect high differential pressure faults caused by incorrect opening positions, distances, and spray hole orientations of the inlet and outlet ports, and the faults cannot be completely eliminated during the overhaul period. High differential pressure problems continue to occur after the device is overhauled. Summary of the Invention

[0004] The purpose of the present invention is to provide a differential pressure segmented measurement device for a rectifying column and a method for determining a fault location, which solves the defect that the existing differential pressure measurement method for a rectifying column cannot further accurately determine the high differential pressure part and fault location of the rectifying column, resulting in a large workload for later overhaul.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0006] A differential pressure segmented measurement device for a rectifying column provided by the present invention includes a pressure guiding pipe, one end of the pressure guiding pipe is connected to a first opening formed on the side wall of the top of the rectifying column body, and the other end of the pressure guiding pipe extends from the top of the column to a second opening formed on the side wall at the bottom of the column;

[0007] A plurality of differential pressure pressure guiding ports are formed on the rectifying column body from the top to the bottom of the column, and each differential pressure pressure guiding port is connected to the pressure guiding pipe.

[0008] Preferably, both the first opening and the second opening are located in the gas phase space of the rectifying column body.

[0009] Preferably, the pressure guiding pipe is placed outside the rectification tower body.

[0010] Preferably, a differential pressure guiding port is provided at each of the joints where the tower diameter of the rectification tower body changes from the top to the bottom, at the inlet and outlet ports, at the locations where the internal components of the tower change, and at the locations where the theoretical load inside the tower changes significantly.

[0011] Preferably, multiple differential pressure guiding ports are all placed in the gas phase space of the rectification tower body.

[0012] Preferably, a digital display differential pressure gauge is provided on the pressure guiding pipe.

[0013] A method for determining the fault location by using the differential pressure segmented measurement device of the rectification tower, based on the measurement device, includes the following steps:

[0014] During the normal operation of the rectification tower body, open the first opening and the second opening, close the differential pressure guiding port, and measure the overall tower differential pressure;

[0015] When an abnormality occurs in the operation of the rectification tower body, perform segmented measurement on the differential pressure of the rectification tower body to obtain multiple segmented differential pressures;

[0016] Subtract the obtained overall tower differential pressure and the multiple segmented differential pressures successively to obtain the differential pressure of each section;

[0017] Compare the obtained differential pressure of each section with the corresponding threshold value, and obtain the fault location of the rectification tower body according to the comparison result.

[0018] Preferably, the method for performing segmented measurement on the differential pressure of the rectification tower body is as follows:

[0019] First, open the first opening and the first differential pressure guiding port at the bottom of the rectification tower body, close the second opening and other differential pressure guiding ports, and measure the first differential pressure;

[0020] Next, open the first opening and the second differential pressure guiding port at the bottom of the rectification tower body, close the second opening and other differential pressure guiding ports, and measure the second differential pressure;

[0021] Finally, gradually open the differential pressure guiding ports of each section from the bottom of the rectification tower body upwards to measure the differential pressure until the measurement of the differential pressure of the last section of the tower space at the top of the tower is completed.

[0022] Preferably, the method for successively subtracting the obtained overall tower differential pressure and the multiple segmented differential pressures is as follows:

[0023] First, subtract the first differential pressure from the overall tower differential pressure to obtain the differential pressure between the first section of the tower from the bottom upwards;

[0024] Subtract the second pressure difference from the first pressure difference to obtain the pressure difference between the second tower section from the bottom of the tower upwards;

[0025] And so on, to obtain the pressure differences of each section of the entire tower.

[0026] Preferably, compare the obtained pressure differences of each section with the corresponding threshold values, and obtain the fault location of the rectifying tower body according to the comparison results. The specific method is as follows:

[0027] Divide the obtained pressure differences of each section by the number of trays inside each section to obtain the pressure drop per tray of each section;

[0028] If the obtained pressure drop per tray is higher than the design index, then determine that this tower section is the faulty section.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] A rectifying tower differential pressure segmented measurement device provided by the present invention makes full use of the principles of existing tower differential pressure measurement and the correlation between differential pressure and the fault conditions inside the tower, segments the rectifying tower body, sets differential pressure pressure tapping ports in each section, and then realizes segmented measurement of the differential pressure of the rectifying tower body, so as to accurately determine the fault location of the tower.

[0031] A method for determining the fault location using the rectifying tower differential pressure segmented measurement device provided by the present invention makes full use of the principles of existing tower differential pressure measurement and the correlation between differential pressure and the fault conditions inside the tower. By adding control valves and the method of successive iterative subtraction of differential pressures, the differential pressure conditions of each section of the tower can be accurately measured, so as to accurately determine the fault location of the tower. By comparing with the distribution structure of internal tower components and simulation data, the fault cause can be judged, providing a reference for formulating a scientific and reasonable device adjustment or maintenance plan. Description of the Drawings

[0032] Figure 1 Is the traditional tower differential pressure measurement technology;

[0033] Figure 2 Is a structural schematic diagram of a rectifying tower differential pressure segmented measurement provided by the present invention;

[0034] Figure 3 Is a structural schematic diagram of the demethanizer differential pressure segmented measurement provided by the embodiment of the present invention.

[0035] Among them, 1 - rectifying tower, 2 - top condenser, 3 - top reflux drum, 4 - reflux pump, 5 - reboiler, 6 - first digital remote transmission high-precision differential pressure gauge, 7 - pressure guiding pipe, 8 - pressure tapping valves at each point, 9 - No. 1 side reboiler, 10 - No. 2 side reboiler, 11 - second digital remote transmission high-precision differential pressure gauge, 12 - first pressure guiding valve, 13 - third pressure guiding valve, 14 - third pressure guiding valve. Detailed Embodiments

[0036] In the following description, specific details such as specific system architectures, technologies, etc. are presented for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from hindering the description of the present application.

[0037] It should be understood that when used in the specification and appended claims of the present application, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0038] It should also be understood that the term "and / or" used in the specification and appended claims of the present application refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0039] As used in the specification and appended claims of the present application, the term "if" can be interpreted as "when", "once", "in response to determining", or "in response to detecting" depending on the context. Similarly, the phrases "if determined" or "if [the described condition or event] is detected" can be interpreted as meaning "once determined", "in response to determining", "once [the described condition or event] is detected", or "in response to detecting [the described condition or event]" depending on the context.

[0040] In addition, in the description of the specification and appended claims of the present application, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0041] The reference to "one embodiment" or "some embodiments" etc. described in the specification of the present application means that a specific feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the present application. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in another way. The terms "comprising", "including", "having", and their variants all mean "including but not limited to", unless otherwise specifically emphasized in another way.

[0042] Embodiment 1

[0043] A differential pressure segmented measurement device provided by this embodiment includes a pressure guiding pipe 7. One end of the pressure guiding pipe is connected to a first opening formed on the side wall of the top of the rectifying column body, and the other end of the pressure guiding pipe extends from the top of the column to a second opening formed on the side wall of the bottom of the column. A liquid accumulation tank is connected to the other end of the pressure guiding pipe.

[0044] Both the first opening and the second opening are located in the gas phase space.

[0045] The pressure guiding pipe 7 is arranged outside the rectifying column body.

[0046] A plurality of differential pressure pressure guiding ports are formed on the rectifying column body, and the plurality of differential pressure pressure guiding ports are respectively located at a plurality of feeding and discharging ports on the rectifying column body.

[0047] Each differential pressure pressure guiding port is provided with a pressure guiding port valve, and each pressure guiding port valve is connected to the pressure guiding pipe 7 through a differential pressure pressure guiding pipeline.

[0048] A digital display differential pressure gauge 6 is arranged on the pressure guiding pipe 7.

[0049] All the plurality of differential pressure pressure guiding ports are located in the gas phase space.

[0050] Embodiment 2

[0051] An installation method of a differential pressure segmented measurement device provided by this embodiment includes the following steps:

[0052] Step 1: According to the tray design scheme of the rectifying column body and the simulation data of the rectifying column body, the tower is reasonably segmented during the design process. The basic principles of segmentation are as follows:

[0053] Taking the connection points of the tower diameter changes of the rectifying column body, the feeding and discharging ports of the rectifying column, the changes in the tray structure inside the tower, and the parts with large changes in the internal theoretical load of the tower as the main segmentation nodes, and at the same time combining the measurement error of the differential pressure gauge, reasonably determining the minimum number of segmented trays, and further completing the segmentation of the entire tower inside the main segmentation nodes by combining the operation experience.

[0054] During the design and construction stage of the tower, openings are made in the gas phase space from the bottom and the top of the tower respectively, and a stainless steel pressure guiding pipe with a diameter of 1 / 2" is laid from the bottom of the tower to the height of the opening at the top of the tower. The pressure guiding pipe on the negative pressure side of the differential pressure gauge extends downward and is connected to a liquid accumulation tank;

[0055] Step 2: During the design and construction stage of the tower, openings are made in the gas phase space from the bottom and the top of the tower respectively, and a stainless steel pressure guiding pipe with a diameter of 1 / 2" is laid from the bottom of the tower to the height of the opening at the top of the tower. The pressure guiding pipe on the negative pressure side of the differential pressure gauge extends downward and is connected to a liquid accumulation tank, and the liquid accumulation tank is used to prevent the liquid-carrying of the pressure guiding pipe on the negative pressure side from affecting the measurement result;

[0056] Step 3: According to the divided number of segments, open holes in the gas phase space above the trays of each segment of the tower vessel as differential pressure tapping ports; install valves at each differential pressure tapping port to control whether the trays of this segment participate in differential pressure measurement; add a differential pressure tapping pipeline at the other end of the tapping port valve and connect it to the full tower differential pressure tapping pipe with a tee "T" connection.

[0057] Step 4: The differential pressure gauge should be installed at the top position of the distillation column. The positive pressure side and the negative pressure side of the differential pressure gauge are respectively connected to the tapping pipe at the bottom of the distillation column and the tapping pipe at the top of the distillation column.

[0058] Example 3

[0059] A method for determining the fault location of a distillation column provided in this example includes the following steps:

[0060] Step 1: During normal operation, open the pressure tapping ball valves at the top and bottom of the tower, and the ball valves at the other segmented parts are in the closed state, and measure the full tower differential pressure.

[0061] When the operation of the distillation column is abnormal or the parameters change, resulting in a significantly higher differential pressure during the operation of the tower vessel, gradually close and open the pressure tapping valves of each segment from bottom to top, measure the differential pressure, and record it until the differential pressure measurement of the last segment of the tower vessel space at the top of the tower is completed.

[0062] Step 2: According to the recorded differential pressure data above, perform successive subtractions to obtain the differential pressure of each segment (for example, subtract the second differential pressure data from the full tower differential pressure data to obtain the differential pressure of the first segment at the bottom of the tower vessel); finally, compare according to the differential pressure situation of each segment, the number of trays in each segment, the height data of each segment and the designed single tray pressure reduction data, find out the parts with higher differential pressure in each segment, so as to accurately determine the fault location of the tower vessel, and specifically guide the completion of the adjustment plan and the preparation of the maintenance plan.

[0063] The segment division: The segments often take the inlet and outlet of the tower vessel as the segment demarcation points. The smaller the distance of each divided segment, the more accurately the fault tray position of the demethanizer can be located. At the same time, too small a division distance will result in the measured differential pressure not meeting the accurate measurement accuracy requirements of the differential pressure gauge.

[0064] The stainless steel pressure tapping pipe: The stainless steel pressure tapping pipe is a common stainless steel pressure tapping pipe with a diameter of 1 / 2". The pressure tapping pipe extends from the bottom of the tower to the measurement port at the top of the tower.

[0065] The differential pressure tapping port: The differential pressure tapping ports at each segmented point are set at the top gas phase space of each tray. The opening is a 1" flange interface, which is directly connected to the ball valve. The other end of the ball valve is flange-connected to the stainless steel pipe pressure tapping pipe and is "T" connected to the full tower differential pressure tapping pipe extending vertically upward.

[0066] The differential pressure of each section: Taking the differential pressure of the whole tower as the reference data, by switching the on-off of the pressure guiding valve, the differential pressure from the section after switching to the top of the tower can be measured. Subtracting the second measurement data from the differential pressure of the whole tower, the differential pressure of the first section from the bottom to the top of the tower can be obtained; again, by successively switching the valves, the operating differential pressure is measured. Subtracting the differential pressure data measured for the third time from the differential pressure data measured for the second time, the differential pressure of the second section from the bottom to the top of the tower can be obtained, and so on, to complete the measurement of the differential pressure of each section of the whole tower.

[0067] Determination of the faulty part: Dividing the differential pressure of the trays measured in each section by the number of internal trays in each section, the differential pressure of a single tray in each section can be obtained. When the differential pressure of a single tray is significantly higher than the design index, it is determined that this section of the tower is the faulty section.

[0068] Example 4

[0069] A method for determining the faulty part of a rectifying column provided in this example includes the following steps:

[0070] Step 1, during normal operation, open the pressure guiding ball valves at the top and bottom of the tower, and the ball valves at other segmented parts are in the closed state, and measure the differential pressure of the whole tower;

[0071] When the rectifying column operates abnormally or the parameters change, resulting in a significantly higher operating differential pressure of the tower,

[0072] The differential pressure of the rectifying column body is measured in segments. Specifically:

[0073] First, open the first opening and the first differential pressure guiding port at the bottom of the rectifying column body, close the second opening and other differential pressure guiding ports, and measure the first differential pressure;

[0074] Next, open the first opening and the second differential pressure guiding port at the bottom of the rectifying column body, close the second opening and other differential pressure guiding ports, and measure the second differential pressure;

[0075] Finally, gradually open the differential pressure guiding ports of each section from the bottom of the rectifying column body upwards, measure the differential pressure until the measurement of the differential pressure of the last section of the tower space at the top of the tower is completed;

[0076] Step 2, according to the differential pressure data recorded above, perform successive subtraction to obtain the differential pressure of each section (for example, subtracting the second differential pressure data from the differential pressure data of the whole tower, the differential pressure of the first section at the bottom of the tower can be obtained). Specifically:

[0077] Successively subtract the obtained differential pressure of the whole tower and the differential pressures of multiple segments. The specific method is:

[0078] First, subtract the first differential pressure from the differential pressure of the whole tower to obtain the differential pressure between the first section from the bottom to the top of the tower;

[0079] Subtract the second differential pressure from the first differential pressure to obtain the differential pressure between the second section from the bottom to the top of the tower;

[0080] And so on, the pressure differences of each section of the entire tower are obtained;

[0081] Finally, based on the pressure differences of each section, the number of trays in each section, the height data of each section, and the designed single-tray pressure reduction data are compared to find the parts with high pressure differences in each section, thereby accurately determining the failure location of the tower equipment, and specifically guiding the preparation of the adjustment plan and maintenance plan. Specifically:

[0082] Dividing the pressure difference of each section obtained by the number of trays inside each section gives the pressure drop per tray of each section;

[0083] If the pressure drop per tray obtained is higher than the design index, then this tower section is judged as the faulty section.

[0084] The said section division: The section division often takes the inlet and outlet of the tower equipment as the section boundary point. The smaller the distance of each divided section, the more accurately the faulty tray position of the demethanizer can be located. At the same time, if the division distance is too small, it will cause the measured pressure difference to not meet the accurate measurement accuracy requirements of the pressure gauge.

[0085] The said stainless steel pressure guiding pipe: The stainless steel pressure guiding pipe is a common stainless steel pressure guiding pipe with a diameter of 1 / 2". The pressure guiding pipe extends from the tower bottom to the measurement port at the tower top.

[0086] The said pressure difference pressure guiding port: The pressure difference outlets at each section point are set as the top gas phase space of each tray. The opening is a 1" flange interface, which is directly connected to a ball valve. The other end of the ball valve is flange-connected to a stainless steel pipe pressure guiding pipe, and is "T"-connected to the pressure guiding pipe of the total tower pressure difference vertically upward.

[0087] Example 5

[0088] The demethanizer in the natural gas ethane recovery project of Tarim Oilfield adopts a plate column. After the device was put into production in July 2021, the measured value of the bottom pressure difference of the demethanizer far exceeded the design value, causing flooding of the demethanizer, and the device had to be shut down. Therefore, only by raising the refrigeration temperature and reducing the operating load of the device can the bottom pressure difference of the demethanizer be maintained below the flooding pressure difference.

[0089] To effectively identify the parts with high pressure differences, the method of the present invention is adopted. A pressure guiding valve and a 1 / 2" pressure guiding pipe are led out from the existing 34 tray pressure interfaces of the demethanizer and are "T"-lapped with the existing bottom pressure guiding pipe of the pressure gauge. Limited by the number of openings of the demethanizer, in this embodiment, only the two ends are divided and the pressure differences of each section are measured and calculated.

[0090] First, close the second pressure guiding valve 13, keep the first pressure guiding valve 12 and the third pressure guiding valve 14 in the open state, and measure the bottom pressure difference as ΔP = 19 kPa.

[0091] Open the second pressure guiding valve 13 and close the third pressure guiding valve 14. Measure the pressure difference ΔP1 = 11 kPa between the bottom (17 - 34) trays. The pressure drop per tray at this measurement end can be obtained as dP1 = ΔP1 / 18 = 0.6 kPa.

[0092] Based on the subtraction of the pressure differences measured twice above (ΔP - ΔP1) = ΔP2 = (19 - 11) = 8 kPa, which is the pressure difference between the (34 - 60) trays. The pressure drop per tray at this measurement end can be obtained as dP2 = ΔP2 / 27 = 0.3 kPa.

[0093] In this example, by comparing the measured pressure drop values, dP1 is close to twice that of dP2 and much higher than the design value. It can be judged that the gas / liquid flow is blocked in the (17 - 34) trays, effectively verifying the feasibility of the present invention.

[0094] Since the demethanizer is a pressure vessel that has been put into production, due to the limitation of the available number of existing openings, it is impossible to further divide the (17 - 34) trays into segments, and it is impossible to further accurately locate the tray segment where the flow is blocked.

[0095] The above-described embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included within the protection scope of the present application.

Claims

1. A differential pressure segmented measurement device for a rectification column, characterized in that, it includes a pressure guiding pipe, one end of the pressure guiding pipe is connected to the first opening formed on the side wall of the top of the rectification column body, and the other end of the pressure guiding pipe extends from the top of the column to the second opening formed on the side wall at the bottom of the column; a plurality of differential pressure guiding ports are formed on the rectification column body from the top to the bottom, and each differential pressure guiding port is connected to the pressure guiding pipe.

2. The differential pressure segmented measurement device for a rectification column according to claim 1, characterized in that, both the first opening and the second opening are located in the gas phase space of the rectification column body.

3. The differential pressure segmented measurement device for a rectification column according to claim 1, characterized in that, the pressure guiding pipe is arranged outside the rectification column body.

4. The differential pressure segmented measurement device for a rectification column according to claim 1, characterized in that, a differential pressure guiding port is provided at each connection point where the column diameter of the rectification column body changes from the top to the bottom, at the inlet and outlet ports, at the point where the internal structure of the column changes, and at the point where the theoretical load inside the column changes significantly.

5. The differential pressure segmented measurement device for a rectification column according to claim 1, characterized in that, a plurality of the differential pressure guiding ports are all located in the gas phase space of the rectification column body.

6. The differential pressure segmented measurement device for a rectification column according to claim 1, characterized in that, a digital display differential pressure gauge is arranged on the pressure guiding pipe.

7. A method for determining the fault location by using the differential pressure segmented measurement device for a rectification column according to claim 1, characterized in that, this method is based on the measurement device according to claim 1 and includes the following steps: During the normal operation of the rectification column body, open the first opening and the second opening, close the remaining differential pressure guiding ports, and measure the differential pressure of the whole column; When the rectification column body operates abnormally, perform segmented measurement on the differential pressure of the rectification column body to obtain a plurality of segmented differential pressures; Subtract the obtained differential pressure of the whole column and the plurality of segmented differential pressures successively to obtain the differential pressure of each section; Compare the obtained differential pressure of each section with the corresponding threshold value, and obtain the fault location of the rectification column body according to the comparison result.

8. The method for determining the fault location according to claim 7, characterized in that, the method for performing segmented measurement on the differential pressure of the rectification column body is as follows: First, open the first opening and the first differential pressure guiding port at the bottom of the rectification column body, close the second opening and other differential pressure guiding ports, and measure the first differential pressure; Next, open the first opening and the second differential pressure guiding port at the bottom of the rectification column body, close the second opening and other differential pressure guiding ports, and measure the second differential pressure; Finally, gradually open the differential pressure guiding ports of each section from the bottom to the top of the rectification column body to measure the differential pressure until the measurement of the differential pressure of the last section of the column space at the top of the column is completed.

9. The method for determining the fault location according to claim 7, characterized in that, the method for successively subtracting the obtained differential pressure of the whole column and the plurality of segmented differential pressures is as follows: First, subtract the first differential pressure from the differential pressure of the whole column to obtain the differential pressure between the first section of the column from the bottom to the top; Subtract the second differential pressure from the first differential pressure to obtain the differential pressure between the second section of the column from the bottom to the top; And so on, to obtain the differential pressure of each section of the whole column.

10. A method for determining the fault location according to claim 7, characterized in that, comparing the obtained pressure differences of each section with the corresponding thresholds, and obtaining the fault location of the rectifying column body according to the comparison results. The specific method is as follows: dividing the obtained pressure differences of each section by the number of trays inside each section to obtain the pressure drop per tray of each section; if the obtained pressure drop per tray is higher than the design index, it is determined that this tower section is the fault section.

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