Two-phase flow discharge detection device and detection method

Abstract

The present application discloses a two-phase flow discharge detection device and a detection method, the two-phase flow discharge detection device comprises a discharge material flow pipeline arranged on the discharge outlet of a discharge test container; a heating unit at least partially extending into the discharge material flow pipeline, the heating unit is provided with a liquid blocking component, and the liquid blocking component is located in the discharge material flow pipeline; a detection control unit electrically connected to the heating unit, used to obtain the material temperature of the liquid material in the discharge test container, and control the difference between the temperature of the heating unit and the material temperature to be greater than or equal to a preset temperature difference. When two-phase flow discharge occurs, the discharged liquid droplets are attached to the liquid blocking component. Due to the temperature difference between the discharge material and the liquid blocking component, the temperature or output power of the heating unit will change suddenly. By detecting the temperature or output power change rate of the heating unit, it can be determined whether two-phase flow discharge occurs, thereby realizing accurate detection of two-phase flow discharge.

Description

Technical Field

[0001] The present application relates to the technical field of discharge detection, and in particular to a two-phase flow discharge detection device and a detection method. Background Art

[0002] The discharge flow pattern is crucial to the selection of discharge calculation methods and the design of post-discharge treatment systems. When designing discharges under abnormal conditions, the judgment of the discharge flow pattern has always been a difficult problem that has plagued the design of discharges and post-discharge treatment systems.

[0003] At present, the rapid pressure reduction discharge test (Blowdown test) is mostly used to determine whether the discharge volume of the equipment under abnormal working conditions needs to be calculated according to the two-phase flow discharge. First, the discharge test container filled with materials is placed in a back pressure environment higher than the safety valve trip pressure, and the discharge test container is given the test conditions under the specified abnormal working conditions. When the material in the discharge test container reaches the specified temperature, the back pressure is quickly discharged, so that the material in the discharge test container is ejected instantly. Finally, the amount of remaining material in the discharge test container is used to qualitatively determine whether the discharge needs to be calculated according to the two-phase flow during the discharge.

[0004] For materials with higher viscosity at the discharge temperature and materials that foam during the distillation separation process, the discharge volume under abnormal conditions is often conservatively calculated according to two-phase flow discharge.

[0005] The existing means of judging whether two-phase flow discharge occurs under discharge conditions can only give qualitative conclusions and tend to calculate the discharge volume under abnormal conditions according to two-phase flow discharge, which usually leads to the calculated discharge volume being too conservative, causing an increase in the construction cost of the discharge system and the post-discharge treatment system. Summary of the invention

[0006] The purpose of the present application is to overcome the shortcomings of inaccurate two-phase flow discharge detection in the prior art and to provide a two-phase flow discharge detection device and a detection method with higher detection accuracy.

[0007] The technical solution of the present application provides a two-phase flow discharge detection device, comprising

[0008] A discharge material flow pipe provided on the discharge outlet of the discharge test container;

[0009] a heating unit at least partially extending into the discharge material flow pipe, the heating unit being provided with a liquid blocking member, the liquid blocking member being located in the discharge material flow pipe;

[0010] A detection control unit electrically connected to the heating unit is used to

[0011] Acquiring the material temperature of the liquid material in the discharge test container, and controlling the difference between the temperature of the heating unit and the material temperature to be greater than or equal to a preset temperature difference;

[0012] The temperature and / or output power of the heating unit is detected, and when it is detected that the change rate of the temperature and / or output power of the heating unit is greater than a preset change rate, it is determined that two-phase flow discharge occurs.

[0013] Furthermore, the heating unit comprises a heat pipe, a heating element and a heater;

[0014] The heating element is arranged close to the heat pipe, the heater is connected to the heating element to control the heating element to generate heat, and the heater is electrically connected to the detection control unit;

[0015] The front end of the heat-conducting pipe extends into the discharge material flow pipeline, and the liquid-blocking component is installed at the front end of the heat-conducting pipe.

[0016] Furthermore, a tee is installed on the discharge outlet of the discharge test container, the tee is provided with a material inlet, a material outlet and a detection port, and the discharge material flow pipeline is formed between the material inlet and the material outlet;

[0017] The heating unit extends from the detection port into the discharge material flow pipeline, and the liquid blocking component is located at the center of the cross section of the discharge material flow pipeline.

[0018] Furthermore, a heat insulating layer is provided between the heat conducting pipe and the three-way pipe.

[0019] Furthermore, the heat-conducting tube is a thermocouple sleeve, the heating element is a heating resistance wire, and the heating resistance wire is wound outside the thermocouple sleeve.

[0020] Furthermore, the liquid-blocking member includes at least three concentric rings, and all the concentric rings are connected by at least one connecting line.

[0021] Furthermore, the detection control unit includes

[0022] a material temperature sensor for detecting the temperature of the material,

[0023] a heating temperature sensor for detecting the temperature of the heating unit, and

[0024] A central control device is communicatively connected to the material temperature sensor and the heating temperature sensor, and the central control device is also electrically connected to the heating unit, for

[0025] Acquire the material temperature and the heating unit temperature, and calculate the real-time temperature difference between the material temperature and the heating unit temperature;

[0026] Control the temperature of the heating unit according to the real-time temperature difference so that the real-time temperature difference is equal to the preset temperature difference;

[0027] The temperature and / or output power of the heating unit is detected, and when it is detected that the change rate of the temperature and / or output power of the heating unit is greater than a preset change rate, it is determined that two-phase flow discharge occurs.

[0028] Furthermore, the detection control unit also includes

[0029] A display device connected to the central control device for displaying the material temperature, the heating unit temperature and the real-time temperature difference;

[0030] A two-phase flow discharge indication device communicatively connected to the central control device is used to indicate the occurrence of two-phase flow discharge.

[0031] The technical solution of the present application also provides a two-phase flow discharge detection method for the above-mentioned two-phase flow discharge detection device, comprising:

[0032] Acquiring the material temperature of the liquid material in the discharge test container, and controlling the difference between the temperature of the heating unit and the material temperature to be greater than or equal to a preset temperature difference;

[0033] Real-time detection of the temperature and / or output power of the heating unit;

[0034] When it is detected that the change rate of the temperature and / or the output power of the heating unit is greater than a preset change rate, it is determined that two-phase flow discharge occurs, and a two-phase flow discharge indication is issued.

[0035] Furthermore, the material temperature of the liquid material in the discharge test container is obtained, and the difference between the temperature of the heating unit and the material temperature is controlled to be greater than or equal to a preset temperature difference, specifically including:

[0036] Acquire the material temperature and the heating unit temperature, and calculate the real-time temperature difference between the material temperature and the heating unit temperature;

[0037] The temperature of the heating unit is controlled according to the real-time temperature difference so that the real-time temperature difference is equal to the preset temperature difference.

[0038] After adopting the above technical solution, the following beneficial effects are achieved:

[0039] In the present application, a liquid-blocking component is arranged on the discharge material circulation pipeline, and the liquid-blocking component is connected to the heating unit. By obtaining the material temperature of the liquid material in the discharge test container, the difference between the temperature of the heating unit and the material temperature is controlled to be greater than the preset temperature difference. When two-phase flow discharge occurs, the discharged droplets adhere to the liquid-blocking component when passing through the discharge material circulation pipeline. Due to the temperature difference between the discharged material and the liquid-blocking component, the temperature or output power of the heating unit will change suddenly. By detecting the speed change rate of the temperature or output power of the heating unit, it can be determined whether two-phase flow discharge occurs, thereby realizing accurate detection of two-phase flow discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The disclosure of the present application will become easier to understand with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present application. In the drawings:

[0041] Figure 1 is a schematic diagram of a two-phase flow discharge detection device in one embodiment of the present application;

[0042] Figure 2 is a schematic diagram of a liquid blocking component in an embodiment of the present application;

[0043] Figure 3 It is a flow chart of a two-phase flow discharge detection method in one embodiment of the present application.

[0044] Reference table of reference numerals:

[0045] Release test container 01: release outlet 11;

[0046] Discharge material flow pipeline 02;

[0047] Heating unit 03: heat pipe 31, heating element 32, heater 33, thermal insulation layer 34;

[0048] Liquid blocking member 04: concentric rings 41, connecting line 42;

[0049] Three-way pipe 05: material inlet 51, material outlet 52, detection port 53;

[0050] Material temperature sensor 61 , heating temperature sensor 62 , central control device 63 , display device 64 . DETAILED DESCRIPTION

[0051] The specific implementation of the present application is further described below with reference to the accompanying drawings.

[0052] It is easy to understand that according to the technical solution of the present application, without changing the essential spirit of the present application, a variety of structural modes and implementation modes that can be replaced by those skilled in the art can be replaced with each other. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present application, and should not be regarded as the entirety of the present application or as a limitation or restriction on the technical solution of the application.

[0053] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to their different positions and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0054] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above-mentioned in this application can be understood according to the specific circumstances.

[0055] Two-phase flow discharge detection device:

[0056] The two-phase flow discharge detection device in the embodiment of the present application is as follows Figure 1 Shown, including

[0057] A discharge material flow pipe 02 provided on the discharge outlet 11 of the discharge test container 01;

[0058] A heating unit 03 at least partially extends into the discharge material flow pipe 02, and a liquid blocking member 04 is provided on the heating unit 03, and the liquid blocking member 04 is located in the discharge material flow pipe 02;

[0059] The detection control unit electrically connected to the heating unit 03 is used to

[0060] Obtain the material temperature of the liquid material in the discharge test container 01, and control the difference between the temperature of the heating unit 03 and the material temperature to be greater than or equal to a preset temperature difference;

[0061] The temperature and / or output power of the heating unit 03 is detected. When it is detected that the change rate of the temperature and / or output power of the heating unit 03 is greater than a preset change rate, it is determined that two-phase flow discharge occurs.

[0062] Specifically, when discharge occurs, the discharged material is discharged from the discharge outlet 11 through the discharge material flow pipe 03. The liquid blocking component 04 is installed on the heating unit 03 and extends into the discharge material flow pipe 03 along with the heating unit 03. When two-phase flow discharge occurs, the liquid in the discharge material will adhere to the liquid blocking component 04 when passing through the discharge material flow pipe.

[0063] The detection control unit of the present application obtains the material temperature of the liquid material in the discharge test container 01, and controls the temperature difference between the heating unit 03 and the material temperature to be maintained above a preset temperature difference, and the preset temperature difference is preferably above 10° C. Preferably, the temperature of the heating unit 03 is greater than the material temperature. Taking the preset temperature difference of 10° C. as an example, the detection control unit controls the temperature of the heating unit 03 to be greater than the material temperature by more than 10° C.

[0064] At the same time, the detection control unit monitors the temperature or output power of the heating unit 03 in real time. The liquid blocking component 04 is connected to the heating unit 03 so that the liquid blocking component 04 and the heating unit 03 maintain the same temperature. Since there is a temperature difference between the heating unit 03 and the material temperature, when two-phase flow discharge occurs, the discharged liquid adheres to the liquid blocking component 04, causing the temperature of the heating unit 03 to change suddenly, and also causing a sudden change in the output power. Therefore, the detection control unit can accurately determine whether two-phase flow discharge occurs by detecting the change rate of the temperature or output power of the heating unit 03 and comparing it with the preset change rate.

[0065] The preset change rate includes a preset temperature change rate and a preset power change rate. When the temperature change rate of the heating unit is greater than the preset temperature change rate, and / or the output power change rate of the heating unit is greater than the preset power change rate, it is determined that two-phase flow discharge occurs.

[0066] The embodiment of the present application sets a liquid blocking member 04 connected to the heating unit 03 in the discharge material circulation pipeline 02, and controls and detects the temperature and output power of the heating unit 03, so as to detect in real time whether two-phase flow discharge occurs, improve the accuracy of detection, and provide a data basis for calculating the discharge amount.

[0067] In one embodiment, if Figure 1 As shown, the heating unit 03 includes a heat pipe 31, a heating element 32 and a heater 33;

[0068] The heating element 32 is arranged close to the heat pipe 31, the heater 33 is connected to the heating element 32 to control the heating of the heating element 32, and the heater 33 is electrically connected to the detection control unit;

[0069] The front end of the heat conducting pipe 31 extends into the discharge material flow pipeline 02 , and the liquid blocking member 04 is installed at the front end of the heat conducting pipe 31 .

[0070] Specifically, the heater 33 supplies energy to the heating element 32 , and the heating element 32 is arranged closely to the heat pipe 31 , so that the heat pipe 31 and the liquid blocking member 04 connected to the heat pipe 31 generate heat.

[0071] As an example, the heat pipe 31 adopts a thermocouple sleeve, the heating element 32 adopts a heating resistance wire, the heating resistance wire is wound outside the thermocouple sleeve, and the heater 33 adopts a power supply device, and the heating temperature of the heating resistance wire is adjusted by controlling the output power of the power supply device.

[0072] In the embodiment of the present application, the heating unit 03 is composed of a heat pipe 31, a heating element 32 and a heater 33. The heat pipe 31 is used to isolate the liquid blocking component 04 and the heating element 32 to prevent the discharged material from damaging the heating element 32. At the same time, a thermocouple sleeve is used as the heat pipe 31, which has a good heat conduction effect and can detect the temperature change of the liquid blocking component 04 in time.

[0073] In one embodiment, if Figure 1 As shown, a three-way pipe 05 is installed on the discharge outlet 11 of the discharge test container 01, and the three-way pipe 05 is provided with a material inlet 51, a material outlet 52 and a detection port 53, and a discharge material flow pipeline 02 is formed between the material inlet 51 and the material outlet 52;

[0074] The heating unit 03 extends from the detection port 53 into the discharge material flow pipeline 02 , and the liquid blocking component 04 is located at the center of the cross section of the discharge material flow pipeline 02 .

[0075] Specifically, the material inlet 51 of the three-way pipe 05 is fastened to the discharge outlet 11, and the connection methods include but are not limited to welding, threaded connection, and clamp connection. The material inlet 51 and the material outlet 52 are arranged on the same straight line, and the detection port 53 is arranged on one side of the pipeline between the material inlet 51 and the material outlet 52, so that the three-way pipe 05 forms a T shape.

[0076] The front end of the heat pipe 31 of the heating unit 03 extends from the detection port 53 into the discharge material flow pipe 02, and the liquid blocking member 04 installed at the front end of the heat pipe 31 blocks the center of the cross section of the discharge material flow pipe 02, and the liquid blocking member 04 does not contact the side wall of the discharge material flow pipe 02 to prevent the temperature of the liquid blocking member 04 from being affected. Preferably, the liquid blocking member 04 is installed on the side of the heat pipe 31 facing the material inlet 51, so that the discharge liquid droplets can adhere to the liquid blocking member 04 as much as possible, thereby increasing the temperature change rate of the liquid blocking member 04.

[0077] Furthermore, a heat insulating layer 34 is provided between the heat conducting pipe 31 and the three-way pipe 05 , and the heat insulating layer 34 wraps the heat conducting pipe 31 and the heating element 32 together, which not only ensures the close fit between the heat conducting pipe 31 and the heating element 32 , but also plays a role in heat preservation for the heat conducting pipe 31 .

[0078] In one embodiment, if Figure 2 As shown, the liquid blocking member 04 includes at least three concentric rings 41, and all the concentric rings are connected to form a mesh structure through at least one connecting line 42. This structure can ensure the flow of gas and block liquid droplets, and the mesh structure increases the contact area between the liquid and the liquid blocking member 04, ensuring the temperature change rate of the liquid blocking member 04.

[0079] In one embodiment, if Figure 1 As shown, the detection control unit includes

[0080] a material temperature sensor 61 for detecting the material temperature,

[0081] A heating temperature sensor 62 for detecting the temperature of the heating unit, and

[0082] The central control device 63 is connected to the material temperature sensor 61 and the heating temperature sensor 62 in communication, and the central control device 63 is also electrically connected to the heater 33 of the heating unit 03, for

[0083] Acquire the material temperature and the heating unit temperature, and calculate the real-time temperature difference between the material temperature and the heating unit temperature;

[0084] Control the temperature of the heating unit according to the real-time temperature difference so that the real-time temperature difference is equal to the preset temperature difference;

[0085] The temperature and / or output power of the heating unit is detected, and when it is detected that the change rate of the temperature and / or output power of the heating unit 03 is greater than a preset change rate, it is determined that two-phase flow discharge occurs.

[0086] Specifically, the material temperature sensor 61 and the heating temperature sensor 62 both use thermocouples, and the central control device 63 can use a processor with data processing and program execution functions such as a single-chip microcomputer, a programmable logic controller (PLC), and an embedded chip.

[0087] The material temperature sensor 61 and the heating temperature sensor 62 respectively detect the material temperature in the discharge test container 01 and the temperature of the heating unit and transmit them to the central control device 63. The central control device 63 calculates the real-time temperature difference between the material temperature and the heating unit temperature and adjusts the temperature of the heating unit in real time.

[0088] At the same time, the central control device 63 monitors the temperature and / or output power of the heating unit 03 in real time to determine whether two-phase flow discharge occurs.

[0089] In one embodiment, the detection control unit also includes

[0090] A display device 64 connected to the central control device 63 for displaying the material temperature, the heating unit temperature and the real-time temperature difference;

[0091] A two-phase flow discharge indication device (not shown) connected in communication with the central control device 63 is used to indicate the occurrence of two-phase flow discharge.

[0092] Specifically, the display device 64 can be a display screen, a digital tube or other display device. The display device 64 can also be used to display the output power of the heater 33 of the heating unit 03, so that the staff can judge the occurrence of two-phase flow discharge.

[0093] The two-phase flow discharge indication device may be an indicator light, a buzzer, etc. When the central control device 63 determines that two-phase flow discharge occurs, it controls the two-phase flow discharge indication device to start to indicate the occurrence of two-phase flow discharge.

[0094] The embodiment of the present application displays the material temperature, heating unit temperature, real-time temperature difference and output power of the heater 33 in real time through the display device 64, which is convenient for the staff to monitor the working status of the two-phase flow discharge detection device; at the same time, a two-phase flow discharge indication device is provided to indicate the occurrence of two-phase flow discharge, which is convenient for data recording.

[0095] Two-phase flow release detection method:

[0096] The technical solution of the present application also provides a two-phase flow discharge detection method for the two-phase flow discharge detection device in the above-mentioned embodiment, such as Figure 3 Shown, including

[0097] Step S301: acquiring the material temperature and the heating unit temperature, and calculating the real-time temperature difference between the material temperature and the heating unit temperature;

[0098] Step S302: controlling the temperature of the heating unit according to the real-time temperature difference so that the real-time temperature difference is equal to the preset temperature difference;

[0099] Step S303: detecting the temperature and / or output power of the heating unit in real time;

[0100] Step S304: when it is detected that the change rate of the temperature and / or the output power of the heating unit is greater than a preset change rate, it is determined that two-phase flow discharge occurs, and a two-phase flow discharge indication is issued.

[0101] The above description is only the principle and preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this field, the implementation methods obtained by appropriately combining the technical solutions disclosed in different embodiments are also included in the technical scope of the present invention. On the basis of the principle of the present application, several other variations can be made, which should also be regarded as the protection scope of the present application.

Claims

1. A two-phase flow discharge detection device, characterized in that: include A discharge material flow pipe provided on the discharge outlet of the discharge test container; a heating unit at least partially extending into the discharge material flow pipe, the heating unit being provided with a liquid blocking member, the liquid blocking member being located in the discharge material flow pipe; A detection control unit electrically connected to the heating unit is used to Acquiring the material temperature of the liquid material in the discharge test container, and controlling the difference between the temperature of the heating unit and the material temperature to be greater than or equal to a preset temperature difference; Detecting the temperature and / or output power of the heating unit, and determining that two-phase flow discharge occurs when detecting that a change rate of the temperature and / or output power of the heating unit is greater than a preset change rate; The liquid blocking member comprises at least three concentric rings, and all the concentric rings are connected by at least one connecting line.

2. The two-phase flow discharge detection device according to claim 1, characterized in that: The heating unit comprises a heat pipe, a heating element and a heater; The heating element is arranged close to the heat pipe, the heater is connected to the heating element to control the heating element to generate heat, and the heater is electrically connected to the detection control unit; The front end of the heat-conducting pipe extends into the discharge material flow pipeline, and the liquid-blocking component is installed at the front end of the heat-conducting pipe.

3. The two-phase flow discharge detection device according to claim 2, characterized in that: A tee is installed on the discharge outlet of the discharge test container, the tee is provided with a material inlet, a material outlet and a detection port, and the discharge material flow pipeline is formed between the material inlet and the material outlet; The heating unit extends from the detection port into the discharge material flow pipeline, and the liquid blocking component is located at the center of the cross section of the discharge material flow pipeline.

4. The two-phase flow discharge detection device according to claim 3, characterized in that: A heat insulation layer is also arranged between the heat conducting pipe and the three-way pipe.

5. The two-phase flow discharge detection device according to claim 2, characterized in that: The heat-conducting tube is a thermocouple sleeve, the heating element is a heating resistance wire, and the heating resistance wire is wound outside the thermocouple sleeve.

6. The two-phase flow discharge detection device according to any one of claims 1 to 5, characterized in that: The detection control unit comprises a material temperature sensor for detecting the temperature of the material, a heating temperature sensor for detecting the temperature of the heating unit, and A central control device is communicatively connected to the material temperature sensor and the heating temperature sensor, and the central control device is also electrically connected to the heating unit, for Acquire the material temperature and the heating unit temperature, and calculate the real-time temperature difference between the material temperature and the heating unit temperature; Control the temperature of the heating unit according to the real-time temperature difference so that the real-time temperature difference is equal to the preset temperature difference; The temperature and / or output power of the heating unit is detected, and when it is detected that the change rate of the temperature and / or output power of the heating unit is greater than a preset change rate, it is determined that two-phase flow discharge occurs.

7. The two-phase flow discharge detection device according to claim 6, characterized in that: The detection control unit also includes A display device connected to the central control device for displaying the material temperature, the heating unit temperature and the real-time temperature difference; A two-phase flow discharge indication device communicatively connected to the central control device is used to indicate the occurrence of two-phase flow discharge.

8. A two-phase flow discharge detection method for the two-phase flow discharge detection device according to any one of claims 1 to 7, characterized in that: include Acquiring the material temperature of the liquid material in the discharge test container, and controlling the difference between the temperature of the heating unit and the material temperature to be greater than or equal to a preset temperature difference; Real-time detection of the temperature and / or output power of the heating unit; When it is detected that the change rate of the temperature and / or the output power of the heating unit is greater than a preset change rate, it is determined that two-phase flow discharge occurs, and a two-phase flow discharge indication is issued.

9. The two-phase flow discharge detection method according to claim 8, characterized in that: The step of obtaining the material temperature of the liquid material in the discharge test container and controlling the difference between the temperature of the heating unit and the material temperature to be greater than or equal to a preset temperature difference specifically includes: Acquire the material temperature and the heating unit temperature, and calculate the real-time temperature difference between the material temperature and the heating unit temperature; The temperature of the heating unit is controlled according to the real-time temperature difference so that the real-time temperature difference is equal to the preset temperature difference.

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