Operating tower thermal bypass pressure control system and method based on condenser liquid level assistance

Abstract

The invention discloses an operation tower thermal bypass pressure control system based on condenser liquid level assistance. The operation tower thermal bypass pressure control system comprises an operation tower, a condenser and a return tank, the top outlet of the operating tower is connected with the inlet of the condenser; a bottom outlet of the condenser is communicated with the liquid phase space of the return tank; the gas phase space of the return tank is connected with a first pipeline; a bypass regulating valve is arranged on the heat bypass pipeline; and the liquid level identification device is used for monitoring the liquid level of condensate in the condenser. The invention further discloses an operation tower heat bypass pressure control method based on condenser liquid level assistance. The condensate liquid level in the condenser is monitored through the liquid level recognition device, and when the condensate liquid level of the condenser is suddenly and abnormally increased due to the fact that a large amount of non-condensable gas is gathered, the tower pressure is controlled in a combined control mode that the first controller adjusts the opening degree of the first adjusting valve and the second controller adjusts the opening degree of the bypass adjusting valve; the problem that the tower pressure is difficult to stably control when the content of non-condensable gas at the tower top is relatively high in the existing thermal bypass method is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical production process control, and in particular relates to a condenser liquid level-assisted operating tower heat bypass pressure control system and method. Background Art

[0002] During the distillation or fractionation process, the pressure of the distillation tower or fractionation tower as the operating tower is one of the main control indicators. If the tower pressure fluctuates too much, it will destroy the material balance and gas-liquid balance of the whole tower, making the product fail to meet the required quality. It is a common way to control the quality of products in the distillation or fractionation process to stabilize the tower pressure and then adjust other operating parameters. There are two common tower pressure control methods: the bottleneck method and the thermal bypass method.

[0003] Among them, the heat bypass method is mainly used for the working conditions of full condensation of the gas phase at the top of the tower, such as Figure 1 As shown, the condenser is lower than the reflux tank. After passing through the condenser, the gas at the top of the tower is basically condensed. Then the condensate enters the liquid phase space of the reflux tank from the bottom of the reflux tank. The hot bypass pipeline and its regulating valve are located above the reflux tank and are insulated. The gas passing through the hot bypass pipeline enters the gas phase space of the reflux tank from the upper part of the tank, and no liquid seal is formed. The opening of the hot bypass regulating valve changes the flow rate of the gas in the hot bypass pipeline. The pressure regulation of the operating tower mainly depends on the area of ​​the condenser tube bundle immersed. In the condenser, the tube bundle in the gas phase on the liquid surface plays a condensation and cooling role, while the tube bundle in the liquid phase only plays a cooling role. When controlling the pressure, by adjusting the opening of the regulating valve on the hot bypass pipeline and changing the pressure drop of the regulating valve, the immersed area of ​​the condenser tube bundle is changed, and the heat load of the condenser is adjusted, so as to achieve the purpose of controlling the pressure of the operating tower to remain unchanged. For example, when the regulating valve is closed to reduce the system pressure, the pressure drop ΔP of the regulating valve increases accordingly. Due to the pressure balance relationship, the liquid level difference H between the condenser and the reflux tank will increase accordingly. Since the liquid level in the reflux tank is adjusted at a fixed value, the automatic control liquid level remains unchanged, so the liquid level in the condenser will drop by ΔH, where ΔH=ΔP / (ρ×g), thereby reducing the immersion area of ​​the tube bundle in the condenser, increasing the condensation amount of the material entering the condenser, and reducing the pressure at the top of the tower. In this way, the condensation amount in the condenser is automatically adjusted to be exactly equal to the outflow amount of the material at the top of the tower, thereby keeping the pressure at the top of the tower unchanged.

[0004] The thermal bypass method has the following advantages over the bottleneck control scheme: the condenser is installed below the reflux tank, which can save the investment cost of the supporting structure; the regulating valve is installed on the thermal bypass pipeline, and the size can be greatly reduced. Therefore, the thermal bypass pressure control scheme has been widely used.

[0005] The existing hot bypass pressure control scheme can achieve the control of the tower top pressure under normal circumstances while saving investment. However, there is a certain lag in the tower pressure control when the non-condensable gas content at the tower top is high. In extreme cases, it may even cause the reflux pump to be emptied and the tower pressure to be out of control, affecting the safe production of the device.

[0006] Therefore, for the thermal bypass control method, a new pressure control method is urgently needed to achieve tower pressure stability when a large amount of non-condensable gas appears in the condensed gas at the top of the tower.

[0007] Based on this, the present application proposes a condenser liquid level-assisted operating tower thermal bypass pressure control system and method, which monitors the condensate level in the condenser through a liquid level identification device, and monitors the rising speed of the condensate level, the upper limit setting of the condensate level and the opening of the bypass regulating valve. Under the condition of stable condensate level in the condenser, the tower pressure is controlled by adjusting the opening of the bypass regulating valve by the second controller. When a large amount of non-condensable gas accumulates and causes the condensate level of the condenser to suddenly increase abnormally, the tower pressure is controlled by a joint control method of adjusting the opening of the first regulating valve by the first controller and the opening of the bypass regulating valve by the second controller. This solves the problem of the existing thermal bypass method that the tower pressure is difficult to stably control when the non-condensable gas content at the top of the tower is high, thereby improving the safety production level of the device. Summary of the invention

[0008] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and to provide an operating tower heat bypass pressure control system based on condenser liquid level assistance.

[0009] To achieve the above object, the present invention adopts the following technical solution:

[0010] The operating tower thermal bypass pressure control system based on condenser liquid level assistance includes an operating tower, a condenser, and a reflux tank;

[0011] The top outlet of the operating tower is connected to the inlet of the condenser through a first pipeline;

[0012] The bottom outlet of the condenser is connected to the liquid phase space in the reflux tank through a second pipeline;

[0013] The gas phase space in the reflux tank is connected to the first pipeline via a hot bypass pipeline;

[0014] A bypass regulating valve is arranged on the thermal bypass pipeline;

[0015] The condenser is located below the reflux tank;

[0016] Also included is a liquid level identification device for monitoring the condensate level in the condenser.

[0017] Preferably, a non-condensable gas discharge pipeline is provided at the gas phase outlet of the reflux tank, and a first regulating valve is provided on the non-condensable gas discharge pipeline.

[0018] Preferably, a liquid phase discharge pipeline is provided at the liquid phase outlet of the reflux tank, and a second regulating valve is provided on the liquid phase discharge pipeline.

[0019] Preferably, the liquid level identification device is connected to a first controller, and the first controller is connected to a first regulating valve;

[0020] The tower top pressure sensor in the operating tower is connected to a second controller, and the second controller is connected to a bypass regulating valve;

[0021] The second controller is connected to the first controller.

[0022] Preferably, the liquid level identification device comprises an infrared imager for monitoring the condensate level in the condenser;

[0023] The housing of the infrared imager is connected to the fixing component.

[0024] Preferably, the fixing assembly comprises two symmetrical fixing splints;

[0025] The two fixed splints are detachably connected by a plurality of fasteners;

[0026] One of the fixing plates is connected to the outer casing of the infrared imager.

[0027] Preferably, the fasteners include matching fastening bolts and fastening nuts.

[0028] Preferably, the housing of the infrared imager is connected to the corresponding fixing clamp via an adjustment component;

[0029] The adjustment assembly includes a horizontal rotation mechanism, a vertical rotation mechanism, and an axial rotation mechanism;

[0030] One end of the horizontal rotation mechanism is fixedly connected to the corresponding fixed clamping plate, and the other end of the horizontal rotation mechanism is rotatably matched with a first rotation axis extending in the vertical direction;

[0031] One end of the vertical rotation mechanism is fixedly connected to the first rotation shaft, and the horizontal rotation mechanism is provided with a horizontal driving member for driving the first rotation shaft to rotate; the other end of the vertical rotation mechanism is rotatably matched with a second rotation shaft extending in the horizontal direction;

[0032] One end of the axial rotation mechanism is fixedly connected to the second rotating shaft, and the vertical rotation mechanism is provided with a vertical driving member for driving the second rotating shaft to rotate; the other end of the axial rotation mechanism is matched with a third rotating shaft;

[0033] The third rotating shaft is fixedly connected to the housing of the infrared imager, and the axial rotating mechanism is provided with an axial driving member for driving the third rotating shaft to rotate;

[0034] The first rotation axis, the second rotation axis, and the third rotation axis are perpendicular to each other.

[0035] Preferably, a USB port is provided on the infrared imager.

[0036] Preferably, the infrared imager is connected to a single chip microcomputer, and the single chip microcomputer recognizes the infrared image taken by the infrared imager to obtain the corresponding condensation liquid level;

[0037] The single chip microcomputer and the infrared imager are both connected to the infrared terminal APP on the mobile phone.

[0038] The present invention also provides a method for controlling the heat bypass pressure of an operating tower based on the assistance of a condenser liquid level.

[0039] The method for controlling the operating tower heat bypass pressure based on the condenser liquid level auxiliary is implemented by using the operating tower heat bypass pressure control system based on the condenser liquid level auxiliary, and includes the following steps:

[0040] Step 1: The liquid level identification device monitors the condensate level in the condenser and transmits the condensate level data to the first controller;

[0041] The tower top pressure sensor monitors the tower top pressure of the operating tower and transmits the tower top pressure data to the second controller;

[0042] The second controller monitors the opening of the bypass regulating valve and transmits the opening information of the bypass regulating valve to the first controller;

[0043] Step 2: The first controller receives the condensate level in the condenser monitored by the liquid level identification device and the opening of the bypass regulating valve transmitted by the second controller;

[0044] When the condensate level in the condenser is normal and the opening of the bypass regulating valve is greater than 0, proceed to step 3:

[0045] Otherwise, proceed to step 4:

[0046] Step 3: The first controller controls the first regulating valve on the reflux tank to be fully closed;

[0047] The second controller receives the tower top pressure monitored by the tower top pressure sensor. When the tower top pressure exceeds the set tower pressure, the second controller controls the bypass regulating valve to open smaller. When the tower top pressure is less than the set tower pressure, the second controller controls the bypass regulating valve to open larger.

[0048] Then proceed to step 1;

[0049] Step 4: The first controller controls the first regulating valve on the reflux tank to be fully opened, and the second controller controls the bypass regulating valve to be opened wider; then proceed to step 1.

[0050] Preferably, in step 2, the abnormal situation is that the condensate liquid level in the condenser reaches 5% of the maximum liquid level rising per minute or the condensate liquid level in the condenser rises to 85% of the maximum liquid level.

[0051] The beneficial effects of the present invention are:

[0052] (1) The present invention monitors the condensate level in the condenser through a liquid level identification device, and monitors the rising speed of the condensate level, the upper limit setting of the condensate level and the opening of the bypass regulating valve. Under the condition of stable condensate level in the condenser, the tower pressure is controlled by adjusting the opening of the bypass regulating valve by the second controller. When a large amount of non-condensable gas accumulates and causes the condensate level in the condenser to suddenly increase abnormally, the tower pressure is controlled by a combined control method of adjusting the opening of the first regulating valve by the first controller and adjusting the opening of the bypass regulating valve by the second controller. This solves the problem of the existing thermal bypass method that the tower pressure is difficult to stably control when the non-condensable gas content at the top of the tower is high, thereby improving the safety level of the device.

[0053] (2) When the pressure fluctuation at the top of the tower causes the liquid level in the condenser to fluctuate, the present invention promptly identifies the liquid level change through an infrared imager, thereby achieving real-time monitoring of the condensate level in the condenser. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0055] Figure 1 It is a schematic diagram of a thermal bypass valve;

[0056] Figure 2 It is a structural schematic diagram of the operating tower heat bypass pressure control system based on condenser liquid level assistance of the present invention;

[0057] Figure 3 It is a schematic flow diagram of a method for controlling the heat bypass pressure of an operating tower based on condenser liquid level assistance of the present invention;

[0058] Figure 4 The structure of the liquid level identification device in the present invention is shown in FIG. Figure 1 ;

[0059] Figure 5 The structure of the liquid level identification device in the present invention is shown in FIG. Figure 2 ;

[0060] Figure 6 It is a schematic diagram of the connection between the liquid level identification device and the mobile phone in the present invention;

[0061] Figure 7 It is a schematic diagram of the interface of the infrared terminal APP of the present invention;

[0062] Figure 8 It is a schematic diagram of the interface for setting the monitoring area in the present invention;

[0063] Fig. 9 It is a schematic diagram of the interface for viewing monitoring results in the present invention;

[0064] in:

[0065] 01-operating tower; 02-condenser; 03-reflux tank; 04-first pipeline; 05-second pipeline; 06-thermal bypass pipeline; 07-bypass regulating valve; 08-non-condensable gas discharge pipeline; 09-first regulating valve; 010-liquid phase discharge pipeline; 011-second regulating valve;

[0066] 1-fixing splint; 2-fastening bolt, 21-fastening nut; 3-horizontal rotation mechanism, 31-first rotation axis; 4-vertical rotation mechanism, 41-second rotation axis; 5-signal transmitting antenna; 6-infrared imager; 7-lens; 8-axial rotation mechanism, 81-third rotation axis; 9-USB socket;

[0067] 10 - first controller; 11 - second controller; 12 - tower top pressure sensor. DETAILED DESCRIPTION

[0068] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0069] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0070] In the present invention, the directions or positional relationships indicated by terms such as "upper", "lower", "bottom", "top", etc. are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention. They do not specifically refer to any part or element in the present invention and cannot be understood as limitations on the present invention.

[0071] In the present invention, terms such as "connected" and "connection" should be understood in a broad sense, indicating that the connection can be fixed, integral or detachable; it can be directly connected or indirectly connected through an intermediate medium. Relevant scientific research or technical personnel in this field can determine the specific meaning of the above terms in the present invention according to specific circumstances, and they should not be understood as limiting the present invention.

[0072] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0073] Embodiment 1:

[0074] like Figure 2 As shown, the operating tower heat bypass pressure control system based on condenser liquid level assistance includes an operating tower 01, a condenser 02, and a reflux tank 03;

[0075] The top outlet of the operating tower 01 is connected to the inlet of the condenser 02 through the first pipeline 04;

[0076] The bottom outlet of the condenser 02 is connected to the liquid phase space in the reflux tank 03 through the second pipeline 05;

[0077] The gas phase space in the reflux tank 03 is connected to the first pipeline 04 via a heat bypass pipeline 06;

[0078] A bypass regulating valve 07 is provided on the thermal bypass pipeline 06;

[0079] The condenser 02 is located below the reflux tank 03;

[0080] It also includes a liquid level identification device for monitoring the condensate level in the condenser 02.

[0081] Preferably, a non-condensable gas discharge pipeline 08 is provided at the gas phase outlet of the reflux tank 03 , and a first regulating valve 09 is provided on the non-condensable gas discharge pipeline 08 .

[0082] Preferably, a liquid phase discharge pipeline 010 is provided at the liquid phase outlet of the reflux tank 03 , and a second regulating valve 011 is provided on the liquid phase discharge pipeline 010 .

[0083] Preferably, the liquid level identification device is connected to the first controller 10, and the first controller 10 is connected to the first regulating valve 09;

[0084] The tower top pressure sensor 12 in the operating tower 01 is connected to the second controller 11, and the second controller 11 is connected to the bypass regulating valve 07;

[0085] The second controller 11 is connected to the first controller 10 .

[0086] Under normal circumstances, the condensate level in condenser 02 will not change significantly. If the gas load at the top of the operating tower is high, the condensate level will be low. If the gas load at the top of the operating tower is low, the condensate level will be high. If the condensate level changes suddenly, especially if it rises suddenly, it is caused by the accumulation of a large amount of non-condensable gas in the top system. If it is not handled in advance and correctly, it may cause the reflux tank level to suddenly drop, the reflux to be interrupted, and cause overpressure at the top of the tower, which is very dangerous.

[0087] In the present application, when the condensing liquid level of the condenser 02 is stable, the tower pressure is controlled by adjusting the opening of the bypass regulating valve 07 by the second controller 11. When a large amount of non-condensable gas accumulates and causes the condensing liquid level of the condenser 02 to suddenly increase abnormally, the tower pressure is controlled by a combined control method of adjusting the opening of the first regulating valve 09 by the first controller 10 and adjusting the opening of the bypass regulating valve 07 by the second controller 11.

[0088] Embodiment 2:

[0089] The operating tower thermal bypass pressure control system based on condenser liquid level assistance includes operating tower 01, condenser 02, and reflux tank 03;

[0090] The top outlet of the operating tower 01 is connected to the inlet of the condenser 02 through the first pipeline 04;

[0091] The bottom outlet of the condenser 02 is connected to the liquid phase space in the reflux tank 03 through the second pipeline 05;

[0092] The gas phase space in the reflux tank 03 is connected to the first pipeline 04 via a heat bypass pipeline 06;

[0093] A bypass regulating valve 07 is provided on the thermal bypass pipeline 06;

[0094] The condenser 02 is located below the reflux tank 03;

[0095] It also includes a liquid level identification device for monitoring the condensate level in the condenser 02.

[0096] Preferably, a non-condensable gas discharge pipeline 08 is provided at the gas phase outlet of the reflux tank 03 , and a first regulating valve 09 is provided on the non-condensable gas discharge pipeline 08 .

[0097] Preferably, a liquid phase discharge pipeline 010 is provided at the liquid phase outlet of the reflux tank 03 , and a second regulating valve 011 is provided on the liquid phase discharge pipeline 010 .

[0098] Preferably, the liquid level identification device is connected to the first controller 10, and the first controller 10 is connected to the first regulating valve 09;

[0099] The tower top pressure sensor 12 in the operating tower 01 is connected to the second controller 11, and the second controller 11 is connected to the bypass regulating valve 07;

[0100] The second controller 11 is connected to the first controller 10 .

[0101] Preferably, Figure 4-5 As shown, the liquid level identification device includes an infrared imager 6 for monitoring the condensation liquid level in the condenser 02. Specifically, a signal transmitting antenna 5 is provided on the infrared imager 6, and a lens 7 is provided on the infrared imager 6;

[0102] The housing of the infrared imager 6 is connected to a fixing component, and the infrared imager 6 is fixed to an installation area such as an on-site pipeline or an equipment handrail through the fixing component.

[0103] Among them, there is an obvious condensation interface in the operating tower top condenser 02, that is: when the cooling medium (mostly circulating water) goes through the condenser tube side and the tower top gas goes through the condenser shell side, the upper tube bundle of condenser 02 plays a condensation role and phase change occurs. The gas condensation process releases more latent heat, and the surface temperature of the upper shell side of condenser 02 is higher; while the lower tube bundle plays a cooling role, no phase change occurs, and the temperature of the liquid is lower. Therefore, the surface temperature of the lower shell side of the condenser is lower. In other words, there is an obvious interface between the condensation and cooling parts on the condenser surface, and the upper temperature is significantly higher than the lower temperature by 2 to 6°C. Therefore, adding an infrared thermal imaging non-contact liquid level identification device to monitor the temperature field at the big hat of condenser 02 online can realize real-time monitoring of the condensation liquid level in condenser 02.

[0104] Preferably, the fixing assembly comprises two symmetrical fixing splints 1;

[0105] The two fixed splints 1 are detachably connected via a plurality of fasteners;

[0106] One of the fixing clamping plates 1 is connected to the housing of the infrared imager 6 .

[0107] In the present application, the infrared imager 6 is fixed to an installation area such as an on-site pipeline or an equipment handrail by two fixing clamps 1 .

[0108] Preferably, the fastener includes a matching fastening bolt 2 and a fastening nut 21 .

[0109] Preferably, the housing of the infrared imager 6 is connected to the corresponding fixing clamp plate 1 via an adjustment component;

[0110] The adjustment assembly includes a horizontal rotation mechanism 3, a vertical rotation mechanism 4, and an axial rotation mechanism 8;

[0111] One end of the horizontal rotation mechanism 3 is fixedly connected to the corresponding fixed clamping plate 1, and the other end of the horizontal rotation mechanism 3 is rotatably matched with a first rotation axis 31 extending in the vertical direction;

[0112] One end of the vertical rotation mechanism 4 is fixedly connected to the first rotation shaft 31, and the horizontal rotation mechanism 3 is provided with a horizontal driving member for driving the first rotation shaft 31 to rotate; the other end of the vertical rotation mechanism 4 is rotatably matched with a second rotation shaft 41 extending in the horizontal direction;

[0113] One end of the axial rotation mechanism 8 is fixedly connected to the second rotation shaft 41, and the vertical rotation mechanism 4 is provided with a vertical driving member for driving the second rotation shaft 41 to rotate; the other end of the axial rotation mechanism 8 is matched with a third rotation shaft 81 for rotation;

[0114] The third rotating shaft 81 is fixedly connected to the housing of the infrared imager 6, and the axial rotating mechanism 8 is provided with an axial driving member for driving the third rotating shaft 81 to rotate;

[0115] The first rotation axis 31 , the second rotation axis 41 , and the third rotation axis 81 are perpendicular to each other.

[0116] Specifically, the second rotation axis 41 is perpendicular to the fastening bolt 2 , and the third rotation axis 81 is parallel to the fastening bolt 2 .

[0117] Preferably, the horizontal driving member is a horizontal driving motor, and the output shaft of the horizontal driving motor is coaxially fixedly connected to the first rotating shaft 31 .

[0118] Preferably, the vertical driving member is a vertical driving motor, and the output shaft of the vertical driving motor is coaxially fixedly connected to the second rotating shaft 41 .

[0119] Preferably, the axial driving member is an axial driving motor, and the output shaft of the axial driving motor is coaxially fixedly connected to the third rotating shaft 81 .

[0120] Embodiment 3:

[0121] On the basis of Example 2, a USB socket 9 is provided on the infrared imager 6, and the USB socket 9 can be connected to an external power source for power supply, and can also be connected to a mobile phone via a data cable.

[0122] Preferably, the infrared imager 6 is connected to a single chip microcomputer, and the single chip microcomputer recognizes the infrared image taken by the infrared imager 6 to obtain the corresponding condensation liquid level; wherein the technology of recognizing the infrared image taken by the infrared imager 6 to obtain the corresponding condensation liquid level is a prior art, and its specific implementation method is not repeated here;

[0123] The single chip microcomputer and the infrared imager 6 are both connected to the infrared terminal APP on the mobile phone. Specifically, the single chip microcomputer is connected to the first controller 10 to transmit the condensation liquid level data of the condenser 02 to the first controller 10.

[0124] Specifically, Figure 6 As shown, by connecting a data line between the USB interface 9 and the mobile phone interface, the connection between the single-chip microcomputer, the infrared imager 6 and the infrared terminal APP on the mobile phone is realized.

[0125] like Figure 7 As shown in the figure, the infrared terminal APP can set the monitoring area and view the monitoring results; click the "Monitoring Area Setting" button, and the following Figure 8 In the interface shown, you can edit the name of the monitoring area, set the focal length and reflectivity of the infrared imager 6; specifically, click "Name Edit" to fill in the name of the area, click the "Area Selection" button to select the key parts of the monitoring area, and ensure that the upper part of the selection box is the highest liquid level and the lower part is the lowest liquid level; click "Focal Length Setting" and use the "Increase" and "Decrease" buttons to adjust the image focal length until the image is clear; click the "Reflectivity Setting" button and use the "+" and "-" buttons to set the reflectivity. After the parameter setting is completed, click the "Confirm" button to complete the parameter configuration of the infrared imager 6, and then unplug the USB data cable. At this time, you can open the "Infrared Terminal APP" again and select the "View Monitoring Results" button. Fig. 9 As shown, you can view the latest data of the equipment's liquid level; in the "Historical Data Query" area below, you can query the equipment's historical change trend curve by selecting "Name" and "Date".

[0126] Embodiment 4:

[0127] like Figure 2 As shown, the operating tower heat bypass pressure control system based on condenser liquid level assistance includes an operating tower 01, a condenser 02, and a reflux tank 03;

[0128] The top outlet of the operating tower 01 is connected to the inlet of the condenser 02 through the first pipeline 04;

[0129] The bottom outlet of the condenser 02 is connected to the liquid phase space in the reflux tank 03 through the second pipeline 05;

[0130] The gas phase space in the reflux tank 03 is connected to the first pipeline 04 via a heat bypass pipeline 06;

[0131] A bypass regulating valve 07 is provided on the thermal bypass pipeline 06;

[0132] The condenser 02 is located below the reflux tank 03;

[0133] It also includes a liquid level identification device for monitoring the condensate level in the condenser 02.

[0134] Preferably, a non-condensable gas discharge pipeline 08 is provided at the gas phase outlet of the reflux tank 03 , and a first regulating valve 09 is provided on the non-condensable gas discharge pipeline 08 .

[0135] Preferably, a liquid phase discharge pipeline 010 is provided at the liquid phase outlet of the reflux tank 03 , and a second regulating valve 011 is provided on the liquid phase discharge pipeline 010 .

[0136] Preferably, the liquid level identification device is connected to the first controller 10, and the first controller 10 is connected to the first regulating valve 09;

[0137] The tower top pressure sensor 12 in the operating tower 01 is connected to the second controller 11, and the second controller 11 is connected to the bypass regulating valve 07;

[0138] The second controller 11 is connected to the first controller 10 .

[0139] Under normal circumstances, the condensate level in condenser 02 will not change significantly. If the gas load at the top of the operating tower is high, the condensate level will be low. If the gas load at the top of the operating tower is low, the condensate level will be high. If the condensate level changes suddenly, especially if it rises suddenly, it is caused by the accumulation of a large amount of non-condensable gas in the top system. If it is not handled in advance and correctly, it may cause the reflux tank level to suddenly drop, the reflux to be interrupted, and cause overpressure at the top of the tower, which is very dangerous.

[0140] In the present application, when the condensing liquid level of the condenser 02 is stable, the tower pressure is controlled by adjusting the opening of the bypass regulating valve 07 by the second controller 11. When a large amount of non-condensable gas accumulates and causes the condensing liquid level of the condenser 02 to suddenly increase abnormally, the tower pressure is controlled by a combined control method of adjusting the opening of the first regulating valve 09 by the first controller 10 and adjusting the opening of the bypass regulating valve 07 by the second controller 11.

[0141] Preferably, Figure 4-5 As shown, the liquid level identification device includes an infrared imager 6 for monitoring the condensation liquid level in the condenser 02. Specifically, a signal transmitting antenna 5 is provided on the infrared imager 6, and a lens 7 is provided on the infrared imager 6;

[0142] The housing of the infrared imager 6 is connected to a fixing component, and the infrared imager 6 is fixed to an installation area such as an on-site pipeline or an equipment handrail through the fixing component.

[0143] Among them, there is an obvious condensation interface in the operating tower top condenser 02, that is: when the cooling medium (mostly circulating water) goes through the condenser tube side and the tower top gas goes through the condenser shell side, the upper tube bundle of condenser 02 plays a condensation role and phase change occurs. The gas condensation process releases more latent heat, and the surface temperature of the upper shell side of condenser 02 is higher; while the lower tube bundle plays a cooling role, no phase change occurs, and the temperature of the liquid is lower. Therefore, the surface temperature of the lower shell side of the condenser is lower. In other words, there is an obvious interface between the condensation and cooling parts on the condenser surface, and the upper temperature is significantly higher than the lower temperature by 2 to 6°C. Therefore, adding an infrared thermal imaging non-contact liquid level identification device to monitor the temperature field at the big hat of condenser 02 online can realize real-time monitoring of the condensation liquid level in condenser 02.

[0144] Preferably, the fixing assembly comprises two symmetrical fixing splints 1;

[0145] The two fixed splints 1 are detachably connected via a plurality of fasteners;

[0146] One of the fixing clamping plates 1 is connected to the housing of the infrared imager 6 .

[0147] In the present application, the infrared imager 6 is fixed to an installation area such as an on-site pipeline or an equipment handrail by two fixing clamps 1 .

[0148] Preferably, the fastener includes a matching fastening bolt 2 and a fastening nut 21 .

[0149] Preferably, the housing of the infrared imager 6 is connected to the corresponding fixing clamp plate 1 via an adjustment component;

[0150] The adjustment assembly includes a horizontal rotation mechanism 3, a vertical rotation mechanism 4, and an axial rotation mechanism 8;

[0151] One end of the horizontal rotation mechanism 3 is fixedly connected to the corresponding fixed clamping plate 1, and the other end of the horizontal rotation mechanism 3 is rotatably matched with a first rotation axis 31 extending in the vertical direction;

[0152] One end of the vertical rotation mechanism 4 is fixedly connected to the first rotation shaft 31, and the horizontal rotation mechanism 3 is provided with a horizontal driving member for driving the first rotation shaft 31 to rotate; the other end of the vertical rotation mechanism 4 is rotatably matched with a second rotation shaft 41 extending in the horizontal direction;

[0153] One end of the axial rotation mechanism 8 is fixedly connected to the second rotation shaft 41, and the vertical rotation mechanism 4 is provided with a vertical driving member for driving the second rotation shaft 41 to rotate; the other end of the axial rotation mechanism 8 is matched with a third rotation shaft 81 for rotation;

[0154] The third rotating shaft 81 is fixedly connected to the housing of the infrared imager 6, and the axial rotating mechanism 8 is provided with an axial driving member for driving the third rotating shaft 81 to rotate;

[0155] The first rotation axis 31 , the second rotation axis 41 , and the third rotation axis 81 are perpendicular to each other.

[0156] Specifically, the second rotation axis 41 is perpendicular to the fastening bolt 2 , and the third rotation axis 81 is parallel to the fastening bolt 2 .

[0157] Preferably, the horizontal driving member is a horizontal driving motor, and the output shaft of the horizontal driving motor is coaxially fixedly connected to the first rotating shaft 31 .

[0158] Preferably, the vertical driving member is a vertical driving motor, and the output shaft of the vertical driving motor is coaxially fixedly connected to the second rotating shaft 41 .

[0159] Preferably, the axial driving member is an axial driving motor, and the output shaft of the axial driving motor is coaxially fixedly connected to the third rotating shaft 81 .

[0160] Preferably, a USB socket 9 is provided on the infrared imager 6, and the USB socket 9 can be connected to an external power source for power supply, and can also be connected to a mobile phone via a data cable.

[0161] Preferably, the infrared imager 6 is connected to a single chip microcomputer, and the single chip microcomputer recognizes the infrared image taken by the infrared imager 6 to obtain the corresponding condensation liquid level; wherein the technology of recognizing the infrared image taken by the infrared imager 6 to obtain the corresponding condensation liquid level is a prior art, and its specific implementation method is not repeated here;

[0162] The single chip microcomputer and the infrared imager 6 are both connected to the infrared terminal APP on the mobile phone. Specifically, the single chip microcomputer is connected to the first controller 10 to transmit the condensation liquid level data of the condenser 02 to the first controller 10.

[0163] Specifically, Figure 6 As shown, by connecting a data line between the USB interface 9 and the mobile phone interface, the connection between the single-chip microcomputer, the infrared imager 6 and the infrared terminal APP on the mobile phone is realized.

[0164] like Figure 7 As shown in the figure, the infrared terminal APP can set the monitoring area and view the monitoring results; click the "Monitoring Area Setting" button, and the following Figure 8In the interface shown, you can edit the name of the monitoring area, set the focal length and reflectivity of the infrared imager 6; specifically, click "Name Edit" to fill in the name of the area, click the "Area Selection" button to select the key parts of the monitoring area, and ensure that the upper part of the selection box is the highest liquid level and the lower part is the lowest liquid level; click "Focal Length Setting" and use the "Increase" and "Decrease" buttons to adjust the image focal length until the image is clear; click the "Reflectivity Setting" button and use the "+" and "-" buttons to set the reflectivity. After the parameter setting is completed, click the "Confirm" button to complete the parameter configuration of the infrared imager 6, and then unplug the USB data cable. At this time, you can open the "Infrared Terminal APP" again and select the "View Monitoring Results" button. Fig. 9 As shown, you can view the latest data of the equipment's liquid level; in the "Historical Data Query" area below, you can query the equipment's historical change trend curve by selecting "Name" and "Date".

[0165] Embodiment 5:

[0166] like Figure 3 As shown, the method for controlling the thermal bypass pressure of an operating tower based on the assistance of condenser liquid level is implemented by using the system for controlling the thermal bypass pressure of an operating tower based on the assistance of condenser liquid level in Example 5, and includes the following steps:

[0167] Step 1: The liquid level identification device monitors the condensate level in the condenser 02 and transmits the condensate level data to the first controller 10;

[0168] The tower top pressure sensor 12 monitors the tower top pressure of the operating tower 01 and transmits the tower top pressure data to the second controller 11;

[0169] The second controller 11 monitors the opening of the bypass regulating valve 07 and transmits the opening information of the bypass regulating valve 07 to the first controller 10;

[0170] Step 2: The first controller 10 receives the condensate level in the condenser 02 monitored by the liquid level identification device and the opening of the bypass regulating valve 07 transmitted by the second controller 11;

[0171] When the condensate level in the condenser 02 is normal and the opening of the bypass regulating valve 07 is greater than 0, proceed to step 3:

[0172] Otherwise, proceed to step 4:

[0173] Step 3: The first controller 10 controls the first regulating valve 09 on the reflux tank 03 to be fully closed;

[0174] The second controller 11 receives the tower top pressure monitored by the tower top pressure sensor 12. When the tower top pressure exceeds the set tower pressure, the second controller 11 controls the bypass regulating valve 07 to open smaller. When the tower top pressure is less than the set tower pressure, the second controller 11 controls the bypass regulating valve 07 to open larger.

[0175] Then proceed to step 1;

[0176] Step 4: the first controller 10 controls the first regulating valve 09 on the reflux tank 03 to be fully opened, and the second controller 11 controls the bypass regulating valve to be opened wider; then, the process goes to step 1.

[0177] Preferably, in step 2, the abnormal situation is that the condensation liquid level in the condenser 02 reaches 5% of the maximum liquid level rising per minute or the condensation liquid level in the condenser 02 rises to 85% of the maximum liquid level.

[0178] The present invention monitors the condensate level in the condenser through a liquid level identification device, and monitors the rising speed of the condensate level, the upper limit setting of the condensate level and the opening of the bypass regulating valve 07. Under the condition of stable condensate level in the condenser, the tower pressure is controlled by adjusting the opening of the bypass regulating valve 07 by the second controller 11. When a large amount of non-condensable gas accumulates and causes the condensate level in the condenser to suddenly increase abnormally, the tower pressure is controlled by a combined control method of adjusting the opening of the first regulating valve 09 by the first controller 10 and adjusting the opening of the bypass regulating valve 07 by the second controller 11. This solves the problem of the existing thermal bypass method that the tower pressure is difficult to stably control when the non-condensable gas content at the top of the tower is high, and improves the safety production level of the device.

[0179] Embodiment 6:

[0180] The technical solution of the present invention is explained by taking the pressure control of the top of the depropanizer of a gas fractionation device as an example.

[0181] The feed to the depropanizer of the gas fractionation unit is the material distilled from the top of the stable tower of the catalytic cracking unit. Under normal circumstances, the feed composition is as shown in Table 1:

[0182] Table 1 Gas fractionation unit depropanizer feed composition

[0183] Feed composition Content % (volume fraction) <![CDATA[C1+C2]]> 0.02 Propane 13.29 Propylene 36.86 Isobutane 23.24 n-Butane 4.44 trans-2-butene 5.35 1-Butene 5.81 Isobutylene 6.78 Cis-2-Butene 3.71 <![CDATA[C5 and above]]> 0.04 Hydrogen sulfide 0.46

[0184] Among them, components below C2 are non-condensable gases, and the content of components below C2 in the feed is controlled to be no more than 0.5% (volume fraction). If it exceeds the standard, abnormal tower pressure increase may occur due to the accumulation of non-condensable gases at the top of the tower.

[0185] Under normal circumstances, the main operating parameters of the depropanizer are shown in Table 2:

[0186] Table 2 Main operating parameters of the depropanizer

[0187] project Operation parameters Tower top pressure 1.73MPa Tower top temperature 45.77℃ Reflux tank pressure 1.67MPa Reflow temperature 43.15℃ Reflux tank level 60％ Condenser condensate level 65％

[0188] The depropanizer of the gas fractionation unit is used as Figure 2 In the operation tower 01, pressure control is performed by the following steps.

[0189] Step 11: The liquid level recognition device monitors the condensate level in the condenser 02 and transmits the condensate level data to the first controller 10; since there is an obvious interface between the condensation and cooling parts on the surface of the condenser connected to the depropanizer, the upper temperature is 3.8°C higher than the lower temperature. Therefore, by adding an infrared thermal imaging non-contact liquid level recognition device to monitor the temperature field at the big hat of the top condenser of the depropanizer, the real-time monitoring of the condensate level in the condenser connected to the depropanizer is realized;

[0190] The liquid level identification device as a whole is clamped and installed with the on-site pipelines, equipment handrails, etc. near the large cap head of the condenser through a fixed clamp 1, and is clamped and fixed by fastening bolts 2 and fastening nuts 21, and the camera angle is adjusted by a horizontal rotation mechanism 3, a vertical rotation mechanism 4, and an axial rotation mechanism 8.

[0191] After the installation is completed, use the USB port 9 to connect to the explosion-proof mobile phone through a data cable, install the dedicated "infrared terminal APP" on the mobile phone, open the APP, click the "monitoring area setting" button, and then click "name edit" to fill in the name of the area (such as naming it D101); click the "area selection" button to select the key parts in the monitoring area (such as selecting the top of the condenser as the upper edge of the box, and the bottom as the lower edge), ensuring that the upper part of the selection box is the highest liquid level and the lower part is the lowest liquid level; click "focal length setting" and adjust the image focus to a clear image through the "increase" and "decrease" buttons; click the "reflectivity setting" button and set the reflectivity through the "+" and "-" buttons (such as the condenser material is rough steel, adjust the reflectivity to 0.95). After the parameter setting is completed, click the "confirm" button to complete the configuration of the infrared imager 6, and then unplug the USB data cable. At this time, you can open the "Infrared Terminal APP" again and select the "View Monitoring Results" button to view the latest liquid level data of the equipment; in the "Historical Data Query" area below, you can query the historical change trend curve of the equipment by selecting "Name" and "Date". The collected liquid level data can be transmitted to the first controller 10 on site in real time via wireless;

[0192] The top pressure sensor 12 in the depropanizer monitors the top pressure of the depropanizer and transmits the top pressure data to the second controller 11;

[0193] The second controller 11 monitors the opening of the bypass regulating valve 07 and transmits the opening information of the bypass regulating valve 07 to the first controller 10;

[0194] Step 12: the first controller 10 receives the condensate level in the condenser 02 monitored by the liquid level identification device and the opening of the bypass regulating valve 07 transmitted by the second controller 11;

[0195] When the condensate level in the condenser 02 is normal and the opening of the bypass regulating valve 07 is greater than 0, proceed to step 13:

[0196] The abnormal situation is that the condensate level in condenser 02 reaches 5% of the maximum level per minute or the condensate level in condenser 02 rises to 85% of the maximum level;

[0197] Otherwise, proceed to step 14:

[0198] Step 13: The first controller 10 controls the first regulating valve 09 on the reflux tank 03 to be fully closed;

[0199] The second controller 11 receives the tower top pressure monitored by the tower top pressure sensor 12. When the tower top pressure exceeds the set tower pressure of 1.72Mpa (where the set tower pressure of the depropanizer tower 1.72Mpa is 0.01Mpa less than the tower top pressure of the depropanizer tower 1.73Mpa), the second controller 11 controls the opening of the bypass regulating valve 07 to be reduced. When the tower top pressure is less than the set tower pressure, the second controller 11 controls the opening of the bypass regulating valve 07 to be increased.

[0200] Then proceed to step 11;

[0201] Step 14: the first controller 10 controls the first regulating valve 09 on the reflux tank 03 to be fully opened, and the second controller 11 controls the bypass regulating valve to be opened wider to discharge a large amount of non-condensable gas accumulated in the system; then enter step 11.

[0202] Embodiment 7:

[0203] The technical solution of the present invention is explained by taking the top pressure control of the de-aromatic tower of a dilute ethylene to ethylbenzene unit as an example.

[0204] In the process of producing ethylbenzene from dilute ethylene, the top of the reflux tank of the circulating benzene tower contains some non-condensable gas, which needs to enter the dearomatic tower for distillation. The top of the tower adopts the heat bypass method to control the tower pressure. The feed composition is shown in Table 3, and the main operating parameters of the tower are shown in Table 4.

[0205] Table 3 Feed composition of the dearomatic tower of the ethylene to ethylbenzene unit

[0206] Feed composition Content, %(wt) <![CDATA[C1+C2]]> 5.75 CO 2.14 <![CDATA[CO2]]> 1.32 <![CDATA[N2]]> 0.71 benzene 90.08

[0207] Table 4 Main operating parameters of the dearomatic tower

[0208] project Operation parameters Tower top pressure 0.31MPa Tower top temperature 104.14℃ Reflux tank pressure 0.29MPa Reflow temperature 21.27℃ Reflux tank level 52％ Condenser condensate level 75％

[0209] Use the dearomatic tower of the ethylene to ethylbenzene unit as Figure 2 In the operation tower 01, pressure control is performed by the following steps.

[0210] Step 21: The liquid level identification device monitors the condensate liquid level in the condenser 02 and transmits the condensate liquid level data to the first controller 10; since there is an obvious interface between the condensation and cooling parts on the surface of the condenser connected to the de-aromatic tower, the upper temperature is 2.6°C higher than the lower temperature. Therefore, by adding an infrared thermal imaging non-contact liquid level identification device to monitor the temperature field at the big hat of the de-aromatic tower top condenser online, the real-time monitoring of the condensate liquid level in the condenser connected to the de-aromatic tower can be achieved;

[0211] The liquid level identification device as a whole is clamped and installed with the on-site pipeline, equipment handrail and other installable areas near the large cap head of the condenser through a fixed clamp 1, and is clamped and fixed by fastening bolts 2 and fastening nuts 21, and the camera angle is adjusted by a horizontal rotation mechanism 3, a vertical rotation mechanism 4, and an axial rotation mechanism 8.

[0212] After installation, use the USB port 9 to connect to the explosion-proof mobile phone through a data cable, install the dedicated "infrared terminal APP" on the mobile phone, open the APP, click the "monitoring area setting" button, and then click "name edit" to fill in the name of the area (such as naming it D102); click the "area selection" button to select the key parts in the monitoring area (such as selecting the top of the condenser as the upper edge of the box, and the bottom as the lower edge), ensuring that the upper part of the selection box is the highest liquid level and the lower part is the lowest liquid level; click "focal length setting" and adjust the image focus to a clear image through the "increase" and "decrease" buttons; click the "reflectivity setting" button and set the reflectivity through the "+" and "-" buttons (such as the condenser material is rough steel, adjust the reflectivity to 0.95). After the parameter setting is completed, click the "confirm" button to complete the configuration of the infrared imager 6, and then unplug the USB data cable. At this time, you can open the "Infrared Terminal APP" again and select the "View Monitoring Results" button to view the latest liquid level data of the equipment; in the "Historical Data Query" area below, you can query the historical change trend curve of the equipment by selecting "Name" and "Date". The collected liquid level data can be transmitted to the first controller 10 on site in real time via wireless;

[0213] The top pressure sensor 12 in the dearomatic tower monitors the top pressure of the dearomatic tower and transmits the top pressure data to the second controller 11;

[0214] The second controller 11 monitors the opening of the bypass regulating valve 07 and transmits the opening information of the bypass regulating valve 07 to the first controller 10;

[0215] Step 22: the first controller 10 receives the condensate level in the condenser 02 monitored by the liquid level identification device and the opening of the bypass regulating valve 07 transmitted by the second controller 11;

[0216] When the condensate level in the condenser 02 is normal and the opening of the bypass regulating valve 07 is greater than 0, proceed to step 23:

[0217] Otherwise, proceed to step 24:

[0218] The abnormal situation is that the condensate level in condenser 02 reaches 5% of the maximum level per minute or the condensate level in condenser 02 rises to 85% of the maximum level;

[0219] Step 23: The first controller 10 controls the first regulating valve 09 on the reflux tank 03 to be fully closed;

[0220] The second controller 11 receives the tower top pressure monitored by the tower top pressure sensor 12. When the tower top pressure exceeds the set tower pressure of 0.3Mpa (the set tower pressure of the de-non-aromatic tower of 0.3Mpa is 0.01Mpa less than the tower top pressure of 0.31Mpa of the de-non-aromatic tower), the second controller 11 controls the opening of the bypass regulating valve 07 to be reduced. When the tower top pressure is less than the set tower pressure, the second controller 11 controls the opening of the bypass regulating valve 07 to be increased.

[0221] Then proceed to step 21;

[0222] Step 24: the first controller 10 controls the first regulating valve 09 on the reflux tank 03 to be fully opened, and the second controller 11 controls the bypass regulating valve to be opened wider to discharge a large amount of non-condensable gas accumulated in the system; then enter step 21.

[0223] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not a limitation of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the protection scope of the present invention.

Claims

1. The operating tower heat bypass pressure control system based on condenser liquid level assistance includes the operating tower, condenser, and reflux tank; The top outlet of the operating tower is connected to the inlet of the condenser through a first pipeline; The bottom outlet of the condenser is connected to the liquid phase space in the reflux tank through a second pipeline; The gas phase space in the reflux tank is connected to the first pipeline via a hot bypass pipeline; A bypass regulating valve is arranged on the thermal bypass pipeline; The condenser is located below the reflux tank; It is characterized in that Also included is a liquid level identification device for monitoring the condensate level in the condenser.

2. The operating tower heat bypass pressure control system based on condenser liquid level assistance according to claim 1, characterized in that: A non-condensable gas discharge pipeline is arranged at the gas phase outlet of the reflux tank, and a first regulating valve is arranged on the non-condensable gas discharge pipeline.

3. The operating tower heat bypass pressure control system based on condenser liquid level assistance according to claim 1, characterized in that: A liquid phase discharge pipeline is arranged at the liquid phase outlet of the reflux tank, and a second regulating valve is arranged on the liquid phase discharge pipeline.

4. The operating tower heat bypass pressure control system based on condenser liquid level assistance according to claim 2, characterized in that: The liquid level identification device is connected to the first controller, and the first controller is connected to the first regulating valve; The tower top pressure sensor in the operating tower is connected to a second controller, and the second controller is connected to a bypass regulating valve; The second controller is connected to the first controller.

5. The operating tower heat bypass pressure control system based on condenser liquid level assistance according to claim 4, characterized in that: The liquid level identification device includes an infrared imager for monitoring the condensate level in the condenser; The housing of the infrared imager is connected to the fixing component.

6. The operating tower heat bypass pressure control system based on condenser liquid level assistance according to claim 5, characterized in that: The fixing assembly comprises two symmetrical fixing splints; The two fixed splints are detachably connected by a plurality of fasteners; One of the fixing plates is connected to the outer casing of the infrared imager.

7. The operating tower heat bypass pressure control system based on condenser liquid level assistance according to claim 6, characterized in that: The fasteners include matching fastening bolts and fastening nuts.

8. The operating tower heat bypass pressure control system based on condenser liquid level assistance according to claim 6, characterized in that: The housing of the infrared imager is connected to the corresponding fixing clamp via an adjustment component; The adjustment assembly includes a horizontal rotation mechanism, a vertical rotation mechanism, and an axial rotation mechanism; One end of the horizontal rotation mechanism is fixedly connected to the corresponding fixed clamping plate, and the other end of the horizontal rotation mechanism is rotatably matched with a first rotation axis extending in the vertical direction; One end of the vertical rotation mechanism is fixedly connected to the first rotation shaft, and the horizontal rotation mechanism is provided with a horizontal driving member for driving the first rotation shaft to rotate; the other end of the vertical rotation mechanism is rotatably matched with a second rotation shaft extending in the horizontal direction; One end of the axial rotation mechanism is fixedly connected to the second rotating shaft, and the vertical rotation mechanism is provided with a vertical driving member for driving the second rotating shaft to rotate; the other end of the axial rotation mechanism is matched with a third rotating shaft; The third rotating shaft is fixedly connected to the housing of the infrared imager, and the axial rotating mechanism is provided with an axial driving member for driving the third rotating shaft to rotate; The first rotation axis, the second rotation axis, and the third rotation axis are perpendicular to each other.

9. The operating tower heat bypass pressure control system based on condenser liquid level assistance according to claim 5, characterized in that: The infrared imager is provided with a USB socket.

10. The operating tower heat bypass pressure control system based on condenser liquid level assistance according to claim 5, characterized in that: The infrared imager is connected to the single chip microcomputer, and the single chip microcomputer recognizes the infrared image taken by the infrared imager to obtain the corresponding condensation liquid level; The single chip microcomputer and the infrared imager are both connected to the infrared terminal APP on the mobile phone.

11. A method for controlling the thermal bypass pressure of an operating tower based on condenser liquid level assistance, characterized in that: The operation tower heat bypass pressure control system based on condenser liquid level assistance according to any one of claims 4 to 10 is implemented, comprising the following steps: Step 1: The liquid level identification device monitors the condensate level in the condenser and transmits the condensate level data to the first controller; The tower top pressure sensor monitors the tower top pressure of the operating tower and transmits the tower top pressure data to the second controller; The second controller monitors the opening of the bypass regulating valve and transmits the opening information of the bypass regulating valve to the first controller; Step 2: The first controller receives the condensate level in the condenser monitored by the liquid level identification device and the opening of the bypass regulating valve transmitted by the second controller; When the condensate level in the condenser is normal and the opening of the bypass regulating valve is greater than 0, proceed to step 3: Otherwise, proceed to step 4: Step 3: The first controller controls the first regulating valve on the reflux tank to be fully closed; The second controller receives the tower top pressure monitored by the tower top pressure sensor. When the tower top pressure exceeds the set tower pressure, the second controller controls the bypass regulating valve to open smaller. When the tower top pressure is less than the set tower pressure, the second controller controls the bypass regulating valve to open larger. Then proceed to step 1; Step 4: The first controller controls the first regulating valve on the reflux tank to be fully opened, and the second controller controls the bypass regulating valve to be opened wider; then proceed to step 1.

12. The method for controlling the thermal bypass pressure of an operating tower based on condenser liquid level assistance according to claim 11, characterized in that: In step 2, the abnormal situation is that the condensate level in the condenser reaches 5% of the maximum level rising per minute or the condensate level in the condenser rises to 85% of the maximum level.

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