Phase change test system and method for carbon dioxide in flue gas

Abstract

The invention discloses a phase change test system and method for carbon dioxide in flue gas, relates to the technical field of carbon dioxide treatment, and is used for efficiently detecting phase change parameters of carbon dioxide in flue gas and meeting detection requirements of flue gas with different components. The system comprises a test container, a pressure regulating valve, a pressure transmitter, a temperature regulating system, a temperature transmitter, liquefaction monitoring equipment and control equipment, the test container is used for accommodating flue gas containing carbon dioxide; the pressure regulating valve is communicated with the test container through a pipeline; the control equipment is used for controlling the pressure regulating valve to regulate the pressure of the flue gas filled into the test container, so that the pressure of the flue gas in the test container is maintained to be a preset pressure, and the temperature regulating system is periodically controlled to reduce the temperature of the flue gas in the test container by a preset amplitude; and the control equipment is also used for determining the current temperature and the preset pressure of the flue gas in the test container as the phase change parameters of carbon dioxide in the flue gas according to the liquefaction phenomenon monitored by the liquefaction monitoring equipment in the test container.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon dioxide treatment, and particularly relates to a phase change test system and method for carbon dioxide in flue gas. BACKGROUND

[0002] In the industrial production process of fossil fuel combustion, chemical production and the like, flue gas rich in carbon dioxide is generated, and the carbon dioxide concentration of part of the flue gas exceeds 80%. The carbon dioxide in the flue gas can be liquefied at normal temperature after pressurization, so as to be separated from other gases. However, the phase change parameters such as the liquefaction temperature and pressure of carbon dioxide are closely related to the components of the flue gas, and the carbon dioxide in flue gas of different components often corresponds to different phase change parameters. When the phase camera technology detects the phase change parameters of carbon dioxide in these flue gases, it is difficult to quickly adapt to the detection needs of flue gas of different components, and the detection process is complicated and time-consuming. SUMMARY

[0003] The purpose of the present application is to provide a phase change test system and method for carbon dioxide in flue gas, which aims to efficiently detect the phase change parameters of carbon dioxide in flue gas and meet the detection needs of flue gas of different components.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0005] In a first aspect, the present application provides a phase change test system for carbon dioxide in flue gas, comprising: a test container, a pressure regulating valve, a pressure transmitter, a temperature regulating system, a temperature transmitter, a liquefaction monitoring device and a control device.

[0006] The test container is used to contain flue gas containing carbon dioxide. The pressure regulating valve is communicated with the test container through a pipeline.

[0007] The control device is connected with the pressure regulating valve, the pressure transmitter, the temperature regulating system, the temperature transmitter and the liquefaction monitoring device respectively.

[0008] The control device is used to control the pressure regulating valve to adjust the pressure of the flue gas filled into the test container when the pressure transmitter measures that the pressure of the flue gas in the test container is a preset pressure and the temperature transmitter measures that the temperature of the flue gas in the test container is a preset temperature, so as to maintain the pressure of the flue gas in the test container as the preset pressure, and periodically control the temperature regulating system to reduce the temperature of the flue gas in the test container by a preset amplitude.

[0009] The control device is also used to determine the current temperature of the flue gas in the test container and the preset pressure as the phase change parameters of carbon dioxide in the flue gas according to the liquefaction monitoring device monitoring that the liquefaction phenomenon occurs in the test container.

[0010] Based on this, the phase change test system in the embodiment of the present application can accurately control the temperature and pressure of the flue gas, efficiently detect the phase change parameters of carbon dioxide in the flue gas by fixing the pressure and gradually reducing the temperature, can adapt to the detection requirements of flue gas of different components, realize the rapid determination of the liquefaction critical condition of carbon dioxide in the flue gas, and provide data support for carbon dioxide storage and liquid phase transportation.

[0011] In some embodiments, the control device is further configured to control the pressure regulating valve to adjust the pressure of the flue gas filled into the test container, so that the pressure of the flue gas in the test container reaches the preset pressure, according to the pressure transmitter measuring that the pressure of the flue gas in the test container does not reach the preset pressure.

[0012] In some embodiments, the phase change test system further comprises an insulation box for accommodating the test container. The temperature adjusting system comprises a cooling device. The cooling device is communicated with the insulation box through a cold air circulation pipeline. The control device is specifically configured to periodically control the cooling device to reduce the temperature in the insulation box, so that the temperature of the flue gas in the test container is reduced by a preset amplitude, under the condition that the pressure transmitter measures that the pressure of the flue gas in the test container is the preset pressure, and the temperature transmitter measures that the temperature of the flue gas in the test container is the preset temperature.

[0013] In some embodiments, the temperature adjusting system further comprises a heating device arranged on the pipeline communicated between the pressure regulating valve and the test container. The control device is further configured to control the heating device to heat the pipeline according to the temperature transmitter measuring that the temperature of the flue gas in the test container does not reach the preset temperature, so that the temperature of the flue gas in the test container reaches the preset temperature.

[0014] In some embodiments, the phase change test system further comprises a flue gas collecting device provided with a filling valve. The filling valve is communicated with the pipeline and the pressure regulating valve. The flue gas collecting device is used to accommodate the flue gas collected at the flue gas emission source position. The pressure of the flue gas in the flue gas collecting device is greater than or equal to the target pressure. The target pressure is greater than the preset pressure. The control device is further connected with the filling valve and is further configured to control the opening and closing state of the filling valve.

[0015] In some embodiments, the phase change test system further comprises a dust filter and a dehydration device. The dust filter and the dehydration device are arranged between the filling valve and the pressure regulating valve, and are used to remove solid particles and moisture in the flue gas flowing from the flue gas collecting device to the test container.

[0016] In some embodiments, the phase change test system further comprises an adsorption column. The adsorption column is arranged between the filling valve and the pressure regulating valve, and is used to adsorb acidic gases in the flue gas flowing from the flue gas collecting device to the test container. The inner wall of the test container is sprayed with a Teflon coating.

[0017] In some embodiments, the phase change test system further comprises a vacuum pump. The control device is further connected with the vacuum pump. The control device is further configured to control the vacuum pump to perform vacuumizing on the test container.

[0018] In some embodiments, the test container is provided with a liquefaction observation window.

[0019] In a second aspect, the embodiments of the present application provide a phase change test method of carbon dioxide in flue gas, applied to a control device in a phase change test system. The phase change test system comprises a test container, a pressure regulating valve, a pressure transmitter, a temperature regulating system, a temperature transmitter, a liquefaction monitoring device and the control device. The test container is configured to contain flue gas containing carbon dioxide. The pressure regulating valve is connected with the test container through a pipeline.

[0020] The phase change test method comprises: when the pressure transmitter measures that the pressure of the flue gas in the test container is a preset pressure, and the temperature transmitter measures that the temperature of the flue gas in the test container is a preset temperature, controlling the pressure regulating valve to regulate the pressure of the flue gas filled into the test container, so as to maintain the pressure of the flue gas in the test container as the preset pressure, and periodically controlling the temperature regulating system to reduce the temperature of the flue gas in the test container by a preset amplitude. According to the liquefaction monitoring device, when it is monitored that the liquefaction phenomenon occurs in the test container, the current temperature of the flue gas in the test container and the preset pressure are determined as the phase change parameters of the carbon dioxide in the flue gas.

[0021] In a third aspect, the embodiments of the present application provide a computer device, comprising: a processor connected with a memory, the memory is configured to store computer execution instructions, and the processor executes the computer execution instructions stored in the memory, so that the computer device executes any possible phase change test method of carbon dioxide in flue gas in the second aspect.

[0022] In a fourth aspect, the embodiments of the present application provide a computer readable storage medium, configured to store computer execution instructions, when the computer execution instructions run on a computer device, so that the computer device executes any possible phase change test method of carbon dioxide in flue gas in the second aspect.

[0023] In a fifth aspect, the embodiments of the present application provide a computer program product, comprising computer execution instructions, when the computer execution instructions run on a computer device, so that the computer device executes any possible phase change test method of carbon dioxide in flue gas in the second aspect.

[0024] It should be understood that the technical effects brought by any implementation manner in the second aspect to the fifth aspect can refer to the technical effects brought by the corresponding implementation manner in the first aspect, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some of the embodiments of the present application, and other drawings can be obtained by those of ordinary skill in the art without any creative effort based on these drawings.

[0026] Figure 1 A structural schematic diagram of a phase change test system for carbon dioxide in flue gas provided by an embodiment of the present application;

[0027] Figure 2 A structural schematic diagram of a computer device provided by an embodiment of the present application;

[0028] Figure 3 A flowchart of a phase change test method for carbon dioxide in flue gas provided by an embodiment of the present application;

[0029] Figure 4 A structural schematic diagram of a phase change test device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative effort fall within the scope of protection of the present application.

[0031] The terms “first”, “second” are only used for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with “first”, “second” can explicitly or implicitly include one or more of the features. In the following description, the meaning of “multiple” is two or more, unless otherwise specified.

[0032] In the embodiments of the present application, the terms “include”, “contain” or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes the elements inherent to such process, article or device. Without more limitation, the element defined by the sentence “including one” does not exclude the presence of another identical element in the process, article or device including the element.

[0033] In the embodiments of the present application, the word "exemplary" or "for example" is used to mean serving as an example, instance, or illustration. Any embodiment or design presented as "exemplary" or "for example" in the embodiments of the present application is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "for example" is intended to present concepts in a concrete manner.

[0034] In the description of the specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0035] First, the application scenario involved in the present application is briefly introduced.

[0036] In the industrial production process of fossil fuel combustion, chemical production, etc., flue gas rich in carbon dioxide will be generated, and the carbon dioxide concentration of part of the flue gas exceeds 80%. These flue gases can be liquefied at constant temperature and pressure after pressurization, so as to realize separation from other gases. However, the phase change parameters such as liquefaction temperature and pressure of carbon dioxide are closely related to the composition of flue gas, and the carbon dioxide in flue gas with different components often corresponds to different phase change parameters.

[0037] When the camera technology detects the phase change parameters of carbon dioxide in these flue gases, it is difficult to quickly adapt to the detection needs of flue gases with different components, and the detection process is complicated and time-consuming. Moreover, it is difficult to accurately control the temperature and pressure parameters during the detection process, resulting in large detection result errors. Moreover, there is a lack of impurity treatment mechanism for the characteristics (such as dust or water content) of these flue gases, which easily affects the detection accuracy. At the same time, it is difficult to efficiently draw the carbon dioxide liquefaction phase diagram, and it is difficult to directly provide parameter guidance for engineering application.

[0038] In view of the above problems, the embodiments of the present application provide a phase change test system for carbon dioxide in flue gas, which comprises a test container, a pressure regulating valve, a pressure transmitter, a temperature regulating system, a temperature transmitter, a liquefaction monitoring device and a control device. The test container is used to contain flue gas containing carbon dioxide. The pressure regulating valve is communicated with the test container through a pipeline.

[0039] The control device is connected with the pressure regulating valve, the pressure transmitter, the temperature regulating system, the temperature transmitter and the liquefaction monitoring device respectively. Moreover, the control device can control the pressure regulating valve to regulate the pressure of the flue gas filled into the test container when the pressure transmitter measures that the pressure of the flue gas in the test container is the preset pressure and the temperature transmitter measures that the temperature of the flue gas in the test container is the preset temperature, so as to maintain the pressure of the flue gas in the test container as the preset pressure, and periodically control the temperature regulating system to reduce the temperature of the flue gas in the test container by the preset amplitude. Furthermore, the control device can determine the current temperature of the flue gas in the test container and the preset pressure as the phase transition parameters of carbon dioxide in the flue gas according to the liquefaction monitoring device monitoring that the liquefaction phenomenon occurs in the test container.

[0040] Based on this, the phase transition test system in the embodiment of the present application can accurately control the temperature and pressure of the flue gas, efficiently detect the phase transition parameters of carbon dioxide in the flue gas by fixing the pressure and gradually reducing the temperature, realize the rapid determination of the carbon dioxide liquefaction critical condition in the flue gas, and provide data support for carbon dioxide storage and liquid phase transportation.

[0041] As shown in Figure 1 , it is a structure schematic diagram of a phase transition test system for carbon dioxide in flue gas provided by the embodiment of the present application.

[0042] Figure 1 The phase transition test system shown in the figure comprises a test container marked by reference numeral 1, a pressure regulating valve marked by reference numeral 2, a pressure transmitter marked by reference numeral 3, and a temperature transmitter marked by reference numeral 4. Furthermore, the phase transition test system further comprises Figure 1 a temperature regulating system not shown in the figure, a liquefaction monitoring device and a control device.

[0043] The test container is used to contain flue gas containing carbon dioxide. For example, flue gas with carbon dioxide content of 50%, 60%, 80% or 85%. The test container can be made of high-pressure resistant and corrosion-resistant material (such as stainless steel), and the internal volume can be set according to the test requirements. Or further, the test container can be wrapped with a thermal insulation layer to improve the stability of the temperature and pressure environment inside the test container.

[0044] The pressure regulating valve can be communicated with the test container through a pipeline, that is, arranged on the flue gas conveying pipeline, used to regulate the pressure of the flue gas filled into the test container, so as to realize the accurate control of the flue gas pressure in the test container. Or further, the pressure regulating valve can also be replaced by a regulating valve group. The regulating valve group can comprise a pressure regulating valve and a flow control valve, which can be used to accurately control the pressure and flow of the flue gas filled into the test container.

[0045] The pressure transmitter can be used to measure the pressure of the flue gas in the test container, and can be arranged on the wall of the test container.

[0046] The temperature adjusting system is used to adjust the temperature of the flue gas in the test container. For example, the temperature adjusting system can be used to increase or decrease the temperature of the flue gas in the test container.

[0047] The temperature transmitter is used to measure the temperature of the flue gas in the test container, and can be arranged on the wall of the test container.

[0048] The liquefaction monitoring device is used to monitor whether liquefaction occurs in the test container, i.e., whether carbon dioxide condensation occurs. For example, the liquefaction monitoring device can be a camera built into the test container.

[0049] The control device can be connected with the pressure adjusting valve, the pressure transmitter, the temperature adjusting system, the temperature transmitter and the liquefaction monitoring device respectively.

[0050] The control device is used to control the pressure adjusting valve to adjust the pressure of the flue gas filled into the test container when the pressure transmitter measures that the pressure of the flue gas in the test container is a preset pressure and the temperature transmitter measures that the temperature of the flue gas in the test container is a preset temperature, so as to maintain the pressure of the flue gas in the test container as the preset pressure, and periodically control the temperature adjusting system to reduce the temperature of the flue gas in the test container by a preset amplitude. Further, the control device can determine the current temperature of the flue gas in the test container and the preset pressure as the phase transition parameters of carbon dioxide in the flue gas according to the liquefaction monitoring device monitoring that liquefaction occurs in the test container.

[0051] The preset pressure, the preset temperature and the preset amplitude can be flexibly set according to test requirements, and are not limited. For example, the preset pressure can be in the range of 7.31 MPa to 10 MPa. The preset temperature can be in the range of 0℃ to 30℃. The preset amplitude can be 0.5℃ or 1℃. In this way, the optimal delivery parameters suitable for the carbon dioxide storage and delivery scenario can be determined, and the liquid phase delivery of carbon dioxide is facilitated.

[0052] For example, the control device can control the pressure adjusting valve to adjust the pressure of the flue gas filled into the test container when the pressure transmitter measures that the pressure of the flue gas in the test container is a preset pressure P and the temperature transmitter measures that the temperature of the flue gas in the test container is 30℃, so as to maintain the pressure of the flue gas in the test container as the preset pressure P. Moreover, the control device can control the temperature adjusting system to start, and periodically control the temperature adjusting system to reduce the temperature of the flue gas in the test container by 0.5℃ at a period interval of 10 minutes.

[0053] Thus, the temperature of the flue gas in the test container can be gradually reduced at intervals of 0.5°C starting from 30°C, and the temperature is kept stable for 10 minutes after each reduction. Meanwhile, the liquefaction of the flue gas in the test container is observed by the liquefaction monitoring device. When the liquefaction is observed, the current temperature of the flue gas in the test container is recorded as the critical temperature of the carbon dioxide in the flue gas at the preset pressure P.

[0054] Further, a plurality of preset pressures can be predefined in the control device. After the phase transition parameter of the carbon dioxide in the flue gas is measured at one preset pressure, the control device can switch the one preset pressure to another preset pressure, so as to measure the temperature at which the carbon dioxide is liquefied at each preset pressure, and obtain a plurality of groups of phase transition parameters. Each group of phase transition parameters includes a preset pressure value and a temperature value.

[0055] For example, the plurality of preset pressures can be set at 7.31 MPa, 7.81 MPa, 8.31 MPa, etc. at intervals of 0.5 MPa. The temperature gradient test of step 4 is repeated.

[0056] Thus, the control device can realize intensive testing by appropriate pressure intervals and temperature intervals, so as to accurately test the phase transition parameters and improve the engineering practicability of the phase diagram.

[0057] Further, the control device can efficiently draw the liquefaction phase diagram of the carbon dioxide in the flue gas based on the plurality of groups of phase transition parameters, and provide visual parameter guidance for engineering applications.

[0058] For example, the control device can be a programmable logic controller (PLC) for controlling the pressure regulating valve and the temperature regulating system, and can record the test data in real time and generate a temperature-pressure curve over time. Moreover, the control device can control the heating device, the cooling device and the pressure regulating valve by a proportional integral derivative (PID) algorithm, so as to accurately and synchronously adjust the temperature and pressure parameters and meet the requirement of capturing the critical phase transition point.

[0059] In an embodiment, the control device is further configured to control the pressure regulating valve to adjust the pressure of the flue gas filled into the test container, so as to make the pressure of the flue gas in the test container reach the preset pressure, thereby facilitating the testing, when the pressure of the flue gas in the test container measured by the pressure transmitter does not reach the preset pressure.

[0060] In an embodiment, the phase transition testing system can further include a pressure regulating valve connected to the test container, a heating device connected to the test container, and a cooling device connected to the test container. Figure 1The incubator marked with reference numeral 5 is used to accommodate the test container, so as to adjust the temperature of the flue gas in the test container and improve the stability of the temperature and pressure environment inside the test container.

[0061] The temperature adjusting system can comprise a cooling device, such as Figure 1 The cooling device marked with reference numeral 6 is in communication with the incubator through a cold air circulation pipeline.

[0062] Therefore, the control device can periodically control the cooling device to reduce the temperature in the incubator when the pressure transmitter measures that the pressure of the flue gas in the test container is the preset pressure and the temperature transmitter measures that the temperature of the flue gas in the test container is the preset temperature, so as to reduce the temperature of the flue gas in the test container by a preset amplitude.

[0063] In an embodiment, the temperature adjusting system further comprises a heating device, such as Figure 1 The heating device marked with reference numeral 7 is arranged on the pipeline in communication between the pressure adjusting valve and the test container. The control device can further control the heating device to heat the pipeline when the temperature transmitter measures that the temperature of the flue gas in the test container does not reach the preset temperature, so as to increase the temperature of the flue gas filled into the test container, so that the temperature of the flue gas in the test container reaches the preset temperature.

[0064] Exemplarily, the cooling device can be a semiconductor refrigerator or a liquid nitrogen cooling system. The heating device can be an electric heating wire. In this way, by means of the temperature adjusting system comprising the cooling device and the heating device, accurate temperature adjustment in the range of -20℃ to 100℃ can be achieved, and the temperature control accuracy can reach ±0.5℃.

[0065] In an embodiment, the phase change testing system further comprises a flue gas collecting device, such as Figure 1 The flue gas collecting device marked with reference numeral 8 can be provided with a filling valve. The filling valve is in communication with the pipeline and the pressure adjusting valve.

[0066] The flue gas collecting device is used to accommodate the flue gas collected at the flue gas discharge source position. The pressure of the flue gas in the flue gas collecting device is greater than or equal to a target pressure. The target pressure is greater than the preset pressure. The target pressure can be greater than or equal to 20 MPa. The flue gas collecting device can be a collecting bottle, and the overall design pressure resistance is higher than 20 MPa. Or further, the gas outlet of the flue gas collecting device can be provided with a pressure sensor, so as to monitor the internal pressure.

[0067] In this way, the control device can be further connected with the filling valve for controlling the opening and closing state of the filling valve, so as to control the filling process of the flue gas rich in carbon dioxide in the flue gas collecting device to the test container, such as starting or ending the filling process of the flue gas rich in carbon dioxide in the flue gas collecting device to the test container.

[0068] The flue gas emission source position can be a position rich in carbon dioxide, such as a flue of a power plant or a tail gas pipeline of a chemical plant. The flue gas collecting device can collect flue gas through a high-pressure pipeline to ensure that the flue gas pressure is greater than or equal to a target pressure. During the collection process, the flue gas can also pass through a dust removal filter and a dehydration device in sequence to remove dust with a particle size greater than 1 μm and moisture, so that the water content is reduced to below 0.1%.

[0069] In an embodiment, the phase transition test system can further include a dust removal filter and a dehydration device.

[0070] The dust removal filter and the dehydration device can be arranged between the filling valve and the pressure regulating valve, and used to remove solid particles and moisture in the flue gas flowing from the flue gas collecting device to the test container, so as to avoid interference of impurities on the test.

[0071] For example, after starting the test, the control device can open the filling valve of the flue gas collecting device, and adjust the pressure regulating valve to slowly fill the test container with the flue gas preprocessed by the dust removal filter and the dehydration device. When the flue gas pressure in the test container reaches the preset pressure, the control device can close the filling valve, and maintain the pressure in the test container stable through the pressure regulating valve, so that the pressure fluctuation range is within ±0.05 MPa.

[0072] In an embodiment, the phase transition test system can further include an adsorption column. The adsorption column can be arranged between the filling valve and the pressure regulating valve, and used to adsorb acidic gas in the flue gas flowing from the flue gas collecting device to the test container. In addition, the inner wall of the test container is sprayed with a Teflon coating. In this way, the phase transition test system can support the test on flue gas containing acidic gas.

[0073] For example, flue gas containing acidic gas with a carbon dioxide concentration of 90% can be collected, and the flue gas pressure in the flue gas collecting device is set to 25 MPa. After preprocessing, the flue gas pressure in the test container is 8 MPa. In this way, if liquefaction occurs when the preset pressure is 8 MPa and the temperature is lowered to 18.7°C, it can be determined that the phase transition parameters of carbon dioxide in the flue gas are pressure 8 MPa and temperature 18.7°C. Further, the carbon dioxide liquefaction temperature at other different pressure points can be tested, and a phase diagram can be drawn to provide parameters for design of a carbon dioxide capture system of a plant. For example, a recommended delivery pressure is 8.5 MPa and a temperature is 22°C.

[0074] In an embodiment, the phase transition test system can further include a vacuum pump.

[0075] The control device is further connected with the vacuum pump, and used to control the vacuum pump to perform vacuumization treatment on the test container. For example, before filling the test container with flue gas, the control device can perform vacuumization treatment on the test container through the vacuum pump, so that the vacuum degree in the container is below 1×10-3 Pa, to avoid influence of residual gas on the test result.

[0076] In one embodiment, the test container may be provided with, for example, Figure 1 The liquefaction observation window shown is for testing personnel to observe whether liquefaction has occurred.

[0077] In one embodiment, the phase change testing system may further include, for example, Figure 1 The temperature sensor marked with number 9, and such as Figure 1 Temperature sensor marked with reference numeral 10. Temperature sensor marked with reference numeral 9 can be used to measure the temperature of the heated flue gas. Temperature sensor marked with reference numeral 10 can be used to measure the temperature inside the incubator. The control device is also connected to these two temperature sensors to facilitate precise control of the temperature inside the test container.

[0078] In one embodiment, the phase change testing system may further include, for example, Figure 1 The vent valve is marked with reference numeral 11. The control device is also connected to the vent valve to control its opening degree in order to control the venting process of the flue gas in the test vessel.

[0079] As an example, when testing flue gas emitted from power plant flues, a 5L stainless steel test container can be used, equipped with a 500W electric heating wire and a 300W semiconductor cooler. A temperature transmitter with an accuracy of 0.2℃ in both directions and a pressure transmitter with a range of 0–30 MPa and an accuracy of 0.1% FS can be selected. The pretreatment unit can employ a three-stage filtration process involving activated carbon filtration and molecular sieve dehydration.

[0080] Furthermore, flue gas with a carbon dioxide concentration of 85% can be collected from the power plant flue and fed into the flue gas collection device to a pressure of 22 MPa. After pretreatment, the moisture content of the flue gas can be reduced to 0.05%, and the dust particle size can be less than 0.5 μm.

[0081] Furthermore, the flue gas was filled into the test container to a pressure of 7.31 MPa, and then cooled down at 0.5℃ per cycle, starting from 30℃. When the temperature dropped to 25.3℃, a white mist-like liquefaction phenomenon was observed inside the test container, and the critical temperature was recorded as 25.3℃. Next, the preset pressure was successively adjusted to 7.81 MPa, 8.31 MPa, and 8.81 MPa, and the test was repeated, yielding corresponding critical temperatures of 28.5℃, 31.2℃, and 33.8℃, respectively. A pressure-temperature phase diagram was plotted, determining the optimal transport parameters to be 7.31 MPa and 20℃, ensuring the carbon dioxide remains in a liquid state and minimizing transport energy consumption.

[0082] The phase change test system of carbon dioxide in flue gas can realize the test time of critical temperature of a single pressure point to be shortened to within 30 minutes through the integrated temperature and pressure control system and the standardized test process, and the test efficiency is improved. Moreover, the temperature control accuracy of positive and negative 0.5 DEG C and the pressure control accuracy of positive and negative 0.05 MPa can be realized, and the high-precision sensor can accurately capture the critical phase change point of carbon dioxide liquefaction, and the test error is small. At the same time, the impurities in the flue gas can be effectively removed through the dust filter and the dehydration device, and the flue gas rich in carbon dioxide from different industrial sources can be applied, the test range is widened, and the adaptability is strong. The test results can directly provide the phase diagram and the appropriate parameter range, and accurate technical parameters can be provided for the design and operation of the carbon dioxide capture, compression and transportation system, the engineering debugging cost is reduced, and the engineering guidance is strong.

[0083] Optionally, the control device in the phase change test system of carbon dioxide in flue gas can be a terminal or a server. The terminal can be a personal computer such as a desktop computer, a tablet computer and a notebook computer, and can also be a remote terminal, a terminal equipment (TE) and a mobile device. The server can be a single server, or can also be a server cluster composed of multiple servers. The server cluster can also be referred to as a computer device cluster. In some embodiments, the server cluster can also be a distributed cluster. The terminal and the server are not limited in the application.

[0084] In hardware implementation, the control device can be implemented through a computer device as shown in Figure 2 . As shown in Figure 2 , it is a structural schematic diagram of a computer device provided by the embodiment of the application. Figure 2 The computer device as shown in may include a processor 201, a memory 202, a communication interface 203 and a bus 204. The processor 201, the memory 202 and the communication interface 203 can be connected through the bus 204.

[0085] The processor 201 is the control center of the computer device, and can be a general central processing unit (CPU), or other general-purpose processors, etc. The general-purpose processor can be a microprocessor or any conventional processor, etc.

[0086] As an example, the processor 201 can include one or more CPUs, such as the CPU0 and CPU1 as shown in Figure 2 .

[0087] The memory 202 can be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto.

[0088] In a possible implementation, the memory 202 can exist independently of the processor 201. The memory 202 can be connected to the processor 201 through the bus 204, and used to store data, instructions or program codes. When the processor 201 invokes and executes the instructions or program codes stored in the memory 202, the functions of the control device in the above-mentioned phase change test system of carbon dioxide in flue gas can be implemented.

[0089] In another possible implementation, the memory 202 can also be integrated with the processor 201.

[0090] The communication interface 203 is used for connecting the computer device with other devices through a communication network, which can be an Ethernet, a radio access network (RAN), a wireless local area network (WLAN) or the like. The communication interface 203 can include a receiving unit for receiving data, and a sending unit for sending data.

[0091] The bus 204 can be an industry standard architecture (ISA) bus, a peripheral component interconnect (PCI) bus, an extended industry standard architecture (EISA) bus or the like. The bus can be divided into an address bus, a data bus, a control bus and the like. For the convenience of representation, Figure 2 In the drawings, only one thick line is used to represent the bus, but it does not mean that there is only one bus or only one type of bus.

[0092] It should be noted that Figure 2 The structure shown in the drawings does not constitute a limitation on the computer device, except Figure 2In addition to the components shown, a computer device may include more or fewer components than illustrated, or combine certain components, or have different component arrangements.

[0093] This application also provides a method for testing the phase change of carbon dioxide in flue gas, which can be applied to the control equipment within the aforementioned phase change testing system for carbon dioxide in flue gas. The control equipment can control a pressure transmitter, a temperature transmitter, a pressure regulating valve, and a temperature regulating system to test the phase change parameters of carbon dioxide in flue gas.

[0094] For ease of understanding, the phase change test method for carbon dioxide in flue gas provided in this application will be described in detail below with reference to the accompanying drawings.

[0095] like Figure 3 The diagram shown is a schematic flowchart of a phase change testing method for carbon dioxide in flue gas provided in an embodiment of this application. Figure 3 The phase change testing method for carbon dioxide in flue gas shown can be applied to the control equipment within the aforementioned phase change testing system for carbon dioxide in flue gas. The phase change testing system may include a test container, a pressure regulating valve, a pressure transmitter, a temperature control system, a temperature transmitter, liquefaction monitoring equipment, and control equipment. The test container is used to contain flue gas containing carbon dioxide. The pressure regulating valve is connected to the test container via a pipeline.

[0096] Figure 3 The phase change test methods for carbon dioxide in flue gas shown in the figure include: S301-S302.

[0097] S301. When the pressure transmitter measures the pressure of the flue gas in the test container to be the preset pressure and the temperature transmitter measures the temperature of the flue gas in the test container to be the preset temperature, the pressure regulating valve is controlled to adjust the pressure of the flue gas introduced into the test container so that the pressure of the flue gas in the test container is maintained at the preset pressure, and the temperature regulating system is periodically controlled to reduce the temperature of the flue gas in the test container by a preset amount.

[0098] S302. Based on the liquefaction phenomenon detected by the liquefaction monitoring equipment in the test container, determine the current temperature and preset pressure of the flue gas in the test container as the phase change parameters of carbon dioxide in the flue gas.

[0099] The specific implementation methods of S301-S302 can be referred to the above description of the phase change test system, and will not be repeated here.

[0100] The above describes the scheme of the embodiments of the present application mainly from the method aspect. It can be understood that the control device comprises at least one of the hardware structure and the software module for executing the respective functions in order to implement the above functions. Those skilled in the art should easily realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented in the form of hardware or the combination of hardware and computer software. Whether a certain function is implemented in the form of hardware or computer software driven hardware depends on the specific application and design constraints of the technical scheme. The skilled person can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0101] The embodiments of the present application can divide the functional units of the control device according to the above method examples. For example, each functional unit can be divided according to each function, or two or more functions can be integrated in one processing unit. The integrated unit can be implemented in the form of hardware or software functional unit. It should be noted that the division of units in the embodiments of the present application is illustrative, and is only a logical functional division. In actual implementation, there can be another division method.

[0102] For example, as shown in Figure 4 The phase change test device provided by the embodiments of the present application is shown in the structure schematic view. The phase change test device can be used to execute the above phase change test method of carbon dioxide in flue gas, and can be applied to the control device in the phase change test system of carbon dioxide in flue gas. Figure 4 The phase change test device shown in the structure schematic view includes a control unit 401 and a processing unit 402.

[0103] The control unit 401 is configured to control the pressure regulating valve to regulate the pressure of the flue gas filled into the test container to maintain the pressure of the flue gas in the test container as the preset pressure, and periodically control the temperature regulating system to reduce the temperature of the flue gas in the test container by the preset amplitude, when the pressure transmitter measures that the pressure of the flue gas in the test container is the preset pressure and the temperature transmitter measures that the temperature of the flue gas in the test container is the preset temperature.

[0104] The processing unit 402 is configured to determine the current temperature of the flue gas in the test container and the preset pressure as the phase change parameters of carbon dioxide in the flue gas according to the liquefaction monitoring device monitoring that the liquefaction phenomenon occurs in the test container.

[0105] The specific description of the above optional mode can be referred to the foregoing method embodiments, which will not be described here. In addition, the description of the above provided computer device and the beneficial effects can be referred to the above corresponding method embodiments, which will not be described here.

[0106] The embodiment of the present application further provides a readable storage medium, which stores a computer program. When the computer program is run on a computer device, the computer device executes the method executed by any one of the computer devices provided above.

[0107] The explanation and beneficial effects of the related content in any one of the readable storage media provided above can refer to the corresponding embodiment described above, and will not be repeated here.

[0108] The embodiment of the present application further provides a computer program product containing instructions, which, when run on a computer device, causes the computer device to execute any one of the methods in the above embodiments. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer device, all or part of the processes or functions according to the embodiments of the present application are generated. The computer device can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a readable storage medium or transferred from one readable storage medium to another readable storage medium, for example, the computer instructions can be transferred from one website, computer, server or data center to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode. The readable storage medium can be any available medium that the computer device can access or include one or more data storage devices such as servers, data centers, etc. integrated with the medium. The available medium can be a magnetic medium (such as a floppy disk, a hard disk, a magnetic tape), an optical medium (such as a DVD), etc.

[0109] It should be noted that the above-mentioned devices for storing computer instructions or computer programs provided by the embodiments of the present application, such as but not limited to the above-mentioned memory, readable storage medium, etc., are all non-volatile (non-transitory).

[0110] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A phase change test system for carbon dioxide in flue gas, characterized by, The system comprises: a test container, a pressure regulating valve, a pressure transmitter, a temperature regulating system, a temperature transmitter, a liquefaction monitoring device and a control device; the test container is used for containing flue gas containing carbon dioxide; the pressure regulating valve is communicated with the test container through a pipeline; the control device is connected with the pressure regulating valve, the pressure transmitter, the temperature regulating system, the temperature transmitter and the liquefaction monitoring device respectively; the control device is used for controlling the pressure regulating valve to regulate the pressure of the flue gas filled into the test container when the pressure transmitter measures that the pressure of the flue gas in the test container is a preset pressure and the temperature transmitter measures that the temperature of the flue gas in the test container is a preset temperature, so as to maintain the pressure of the flue gas in the test container as the preset pressure, and periodically controlling the temperature regulating system to reduce the temperature of the flue gas in the test container by a preset amplitude; the control device is further used for determining the current temperature of the flue gas in the test container and the preset pressure as the phase change parameter of carbon dioxide in the flue gas according to the liquefaction monitoring device monitoring that the liquefaction phenomenon occurs in the test container.

2. The phase change testing system according to claim 1, wherein the control device is further used for controlling the pressure regulating valve to regulate the pressure of the flue gas filled into the test container according to the pressure transmitter measuring that the pressure of the flue gas in the test container does not reach the preset pressure, so as to make the pressure of the flue gas in the test container reach the preset pressure.

3. The phase change test system of claim 1, wherein, The system further comprises an insulation box, and the insulation box is used for containing the test container; the temperature regulating system comprises a cooling device, and the cooling device is communicated with the insulation box through a cold air circulation pipeline; the control device is particularly used for periodically controlling the cooling device to reduce the temperature in the insulation box, so as to reduce the temperature of the flue gas in the test container by a preset amplitude when the pressure transmitter measures that the pressure of the flue gas in the test container is a preset pressure and the temperature transmitter measures that the temperature of the flue gas in the test container is a preset temperature.

4. The phase change testing system according to claim 1, wherein the temperature regulating system further comprises a heating device, and the heating device is arranged on the pipeline communicated between the pressure regulating valve and the test container; the control device is further used for controlling the heating device to heat the pipeline according to the temperature transmitter measuring that the temperature of the flue gas in the test container does not reach a preset temperature, so as to make the temperature of the flue gas in the test container reach the preset temperature.

5. The phase change test system of claim 1, wherein, The system further comprises: a flue gas collecting device, and the flue gas collecting device is provided with a filling valve; the filling valve is communicated with the pressure regulating valve through a pipeline; the flue gas collecting device is used for containing the flue gas collected at a flue gas emission source position; the pressure of the flue gas in the flue gas collecting device is greater than or equal to a target pressure; the target pressure is greater than the preset pressure; the control device is further connected with the filling valve, and is further used for controlling the opening and closing state of the filling valve.

6. The phase change test system of claim 5, wherein, The system further comprises: a dust removal filter and a dehydration device; The dust removal filter and the dehydration device are arranged between the filling valve and the pressure regulating valve, and are used to remove solid particles and moisture in the flue gas flowing from the flue gas collecting device to the test container.

7. The phase change test system of claim 5, wherein, Further comprising: an adsorption column; The adsorption column is arranged between the filling valve and the pressure regulating valve, and is used to adsorb acidic gas in the flue gas flowing from the flue gas collecting device to the test container; The inner wall of the test container is sprayed with a Teflon coating.

8. The phase change test system of claim 1, wherein, Further comprising: a vacuum pump; The control device is further connected with the vacuum pump; The control device is further used to control the vacuum pump to perform vacuumizing treatment on the test container.

9. The phase change test system of claim 1, wherein, A liquefaction observation window is arranged on the test container.

10. A method of phase change testing of carbon dioxide in flue gas, characterized by, A control device applied to a phase change test system; the phase change test system comprises a test container, a pressure regulating valve, a pressure transmitter, a temperature regulating system, a temperature transmitter, a liquefaction monitoring device and the control device; the test container is used to contain flue gas containing carbon dioxide; The pressure regulating valve is communicated with the test container through a pipeline; The method comprises: When the pressure transmitter measures that the pressure of the flue gas in the test container is a preset pressure, and the temperature transmitter measures that the temperature of the flue gas in the test container is a preset temperature, the control device controls the pressure regulating valve to adjust the pressure of the flue gas filled into the test container, so that the pressure of the flue gas in the test container is maintained as the preset pressure, and periodically controls the temperature regulating system to reduce the temperature of the flue gas in the test container by a preset amplitude; According to the liquefaction monitoring device, when it is monitored that liquefaction occurs in the test container, the current temperature of the flue gas in the test container and the preset pressure are determined as phase change parameters of carbon dioxide in the flue gas.

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