System and method for continuous acquisition and measurement of mixed gases under high temperature conditions

Abstract

The present invention proposes a system for continuous collection and measurement of mixed gases under high temperature conditions, and relates to the technical field of high temperature mixed gas measurement. It includes a condensing device, a liquid collecting device, a reversing device, and a storage tank group connected in sequence, the gas outlet of the condensing device is connected to the gas inlet of the liquid collecting device, the gas outlet of the liquid collecting device is connected to the inlet of the reversing device, the reversing device includes an inlet and multiple outlets, the storage tank group includes multiple storage tanks, the storage tanks correspond to the outlets of the reversing device one by one, and each outlet is connected to the gas inlet of a storage tank; the storage tanks are connected to a pressure measuring device and a temperature measuring device. The present invention can perform synchronous instantaneous measurement of the concentration, flow rate and other data of the mixed gas through the above-mentioned devices, the measurement results are accurate, the measurement is fast, and the technical difficulties of transient measurement are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature mixed gas measurement, and in particular to a system and method for continuously collecting and measuring mixed gases under high-temperature conditions. Background Art

[0002] Excessive greenhouse gases produced by human activities such as industrial and agricultural production, fossil fuel combustion, and motor vehicle exhaust emissions have aggravated global warming. Researching and developing accurate, rapid, and dynamic detection technologies for greenhouse gases at different spatial and temporal scales is the basis and prerequisite for environmental climate research.

[0003] However, it is difficult to detect the concentration and flow rate of high-temperature gases instantaneously and synchronously through general measurement systems. This is mainly because the gas generation process is very fast, and existing gas analysis devices usually collect and measure the gas concentration in the steady-state process, which makes it difficult to achieve instantaneous measurement. High-temperature gases cannot be directly sent to the mass spectrometer for continuous measurement.

[0004] In view of the shortcomings of the prior art, it is necessary to provide a system and method for continuous collection and measurement of mixed gases under high temperature conditions that can solve the problems raised in the above background technology. Summary of the invention

[0005] The purpose of the present invention is to provide a system and method for continuous acquisition and measurement of mixed gases under high temperature conditions, which can propose solutions to the shortcomings of the prior art. By calculating the transient time step, the process is noded, and each detection time step is regarded as a steady state. The data is displayed through lumped average, which effectively solves the technical problem that high-temperature gas cannot be directly sent into a mass spectrometer for continuous measurement.

[0006] An embodiment of the present invention provides a continuous collection and measurement system for mixed gases under high temperature conditions, comprising a condensing device, a liquid collecting device, a reversing device and a storage tank group connected in sequence, wherein the gas outlet of the condensing device is connected to the gas inlet of the liquid collecting device, the gas outlet of the liquid collecting device is connected to the inlet of the reversing device, the reversing device comprises an inlet and multiple outlets, the storage tank group comprises multiple storage tanks, the storage tanks correspond one-to-one to the outlets of the reversing device, and each outlet is connected to the gas inlet of one of the storage tanks; the storage tanks are externally connected to a pressure measuring device and a temperature measuring device.

[0007] In some embodiments of the present invention, the storage tank is also externally connected to a vacuum pump and an inert gas tank.

[0008] In some embodiments of the present invention, a stirring mechanism is provided in the storage tank.

[0009] In some embodiments of the present invention, the gas inlet of the liquid collecting device is arranged at the upper part of the side wall of the liquid collecting device, and the gas outlet of the liquid collecting device is arranged at the top of the liquid collecting device.

[0010] An embodiment of the present invention further provides a method for continuous acquisition and measurement of mixed gas under high temperature conditions, using a measurement system as described in any one of the above, comprising the following steps:

[0011] The high-temperature mixed gas is cooled by a condensing device to obtain a low-temperature mixed gas;

[0012] Passing the low-temperature mixed gas into a liquid collecting device to separate the condensed liquid and the uncondensed mixed gas in the low-temperature mixed gas;

[0013] The uncondensed mixed gas is passed into a reversing device, and the uncondensed gas is respectively transported to corresponding storage tanks at different preset times through the reversing device, and the gas pressure and temperature in the storage tanks are detected, and the amount of the mixed gas in the storage tanks and the flow rate of the mixed gas in different preset time periods are calculated;

[0014] The mixed gas in the storage tank is sampled and sent to a mass spectrometer to detect the components of the mixed gas.

[0015] In some embodiments of the present invention, the step of passing the uncondensed mixed gas into a reversing device, respectively delivering the uncondensed gas to corresponding storage tanks at different preset times through the reversing device, detecting the gas pressure and temperature in the storage tanks, and calculating the amount of the mixed gas in the storage tanks and the flow rate of the mixed gas in different preset time periods includes:

[0016] Introducing an inert gas into the storage tank and evacuating the storage tank;

[0017] Passing the uncondensed mixed gas into a reversing device, and conveying the uncondensed gas to corresponding storage tanks at different preset times through the reversing device;

[0018] Starting a stirring mechanism in the storage tank to stir the mixed gas in the storage tank;

[0019] Detecting the gas pressure and temperature in the storage tank, and calculating the amount of the mixed gas in the storage tank according to the ideal gas state equation;

[0020] The flow rate of the mixed gas in different preset time periods is calculated according to the amount of the mixed gas in the storage tank.

[0021] In some embodiments of the present invention, the step of sampling the mixed gas in the storage tank and sending it to a mass spectrometer to detect the composition of the mixed gas includes:

[0022] In some embodiments of the present invention, the mixed gases in different storage tanks are sampled, and the sampled mixed gases are separately sent to the mass spectrometer for component detection and analysis.

[0023] Also includes:

[0024] The preset time, mixed gas composition, amount of substance and flow rate data corresponding to different storage tanks are generated into a chart set through software to obtain an instantaneous detection data chart of the high-temperature mixed gas.

[0025] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0026] The present invention is connected in sequence through a condensing device, a liquid collecting device, a reversing device and a storage tank group, wherein the gas outlet of the condensing device is connected to the gas inlet of the liquid collecting device, the gas outlet of the liquid collecting device is connected to the inlet of the reversing device, the reversing device includes an inlet and multiple outlets, the storage tank group includes multiple storage tanks, the storage tanks correspond to the outlets of the reversing device one by one, and each outlet is connected to the gas inlet of one of the storage tanks; the storage tanks are connected to a pressure measuring device and a temperature measuring device. The high-temperature mixed gas is circulated and condensed to reduce the temperature of the high-temperature gas to a low-temperature gas by the condensing device, the condensed water is collected by the liquid collector, and the uncondensed gas is transported into different storage tanks at different time nodes by the reversing device. By detecting the gas pressure and temperature of the storage tank, the amount of gas at different time nodes can be calculated, as well as the gas flow rate and flow rate at different time nodes can be calculated. By sampling the mixed gas and sending it to the mass spectrometer, the gas components at different time nodes can be analyzed. The present invention can perform synchronous instantaneous measurement of the concentration, flow rate and other data of the mixed gas through the above device, the measurement result is accurate, the measurement is fast, and the technical difficulties of transient measurement are effectively solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a structural block diagram of a system for continuously collecting and measuring mixed gases under high temperature conditions in an embodiment of the present invention;

[0029] Figure 2 It is a flow chart of the steps of the method for continuous collection and measurement of mixed gas under high temperature conditions in an embodiment of the present invention.

[0030] Figure numerals: 100, condensation device; 200, liquid collecting device; 300, reversing device; 400, storage tank; 401, stirring mechanism; 500, mass spectrometer. DETAILED DESCRIPTION

[0031] Example

[0032] Reference Figure 1 , showing a schematic structural diagram of a system for continuous acquisition and measurement of mixed gas under high temperature conditions in an embodiment of the present invention;

[0033] A system for continuously collecting and measuring mixed gases under high temperature conditions, comprising a condensing device 100, a liquid collecting device 200, a reversing device 300 and a storage tank body 400 group connected in sequence, the gas outlet of the condensing device 100 is connected to the gas inlet of the liquid collecting device 200, the gas outlet of the liquid collecting device 200 is connected to the inlet of the reversing device 300, the reversing device 300 comprises an inlet and multiple outlets, the storage tank body 400 group comprises multiple storage tank bodies 400, the storage tank bodies 400 correspond one to one to the outlets of the reversing device 300, and each outlet is connected to the gas inlet of a storage tank body 400; the storage tank bodies 400 are externally connected to a pressure measuring device and a temperature measuring device.

[0034] Next, a system for continuously collecting and measuring mixed gases under high temperature conditions in this exemplary embodiment will be further described.

[0035] In one implementation of the present embodiment, the condensing device 100 may adopt a condensing tube, and a condensing water inlet and a condensing water outlet are respectively provided on the side walls of the condensing tube for circulating condensing water. The gas outlet of the condensing device 100 is connected to the gas inlet of the liquid collecting device 200, and the gas inlet of the liquid collecting device 200 is provided at the upper part of the side wall of the liquid collecting device 200, and the gas outlet of the liquid collecting device 200 is provided at the top of the liquid collecting device 200. After the condensed mixed gas enters from the gas inlet of the liquid collecting device 200, the liquid water that may exist after condensation falls downward under its own weight, while the uncondensed mixed gas flows upward and is discharged from the gas outlet. The gas outlet of the liquid collecting device 200 is connected to the inlet of the reversing device 300. The reversing device 300 includes an inlet and multiple outlets. The storage tank body 400 group includes multiple storage tank bodies 400. The storage tank bodies 400 correspond to the outlets of the reversing device 300 one by one. Each outlet is connected to the gas inlet of a storage tank body 400, that is, by controlling the opening and closing of the gas outlet of the reversing device 300, the mixed gas is controlled to enter the corresponding storage tank body 400 at different time points; the storage tank body 400 is externally connected to a pressure measuring device and a temperature measuring device, and the pressure measuring device and the temperature measuring device are used to respectively perform pressure detection and temperature detection on the mixed gas in the storage tank body 400 at different time points.

[0036] As an example, the above-mentioned reversing device 300 can adopt a three-way reversing valve, and control the mixed gas to enter the corresponding storage tank 400 at different time nodes by changing the direction of the reversing valve at different time nodes; other reversing devices 300 can also be used, as long as they can meet the requirements of changing the outlet direction of the mixed gas at different time nodes, and the present application does not limit this.

[0037] In one implementation of this embodiment, the storage tank 400 is also connected to a vacuum pump and an inert gas tank. In the initial state, the valve of the inert gas tank is opened, and the original gas in the storage tank 400 is exhausted by a single inert gas, and then the vacuum pump is used to evacuate the tank to maintain a negative pressure relative to the system, so as to ensure that the incoming gas can be quickly obtained after the valve of the reversing device 300 is opened, and the incoming gas is prevented from staying in the pipeline between the reversing device 300 and the tank, which is also beneficial to the subsequent calculation of the partial pressure.

[0038] It should be noted that the inert gas is selected according to the mixed gas, such as nitrogen and argon. The specific selection criteria of the inert gas are "whether there is a mixing reaction with the detection gas" and "whether it is economical (argon is expensive)". There are two functions of introducing the inert gas into the storage tank 400. One is to prevent the presence of gas that reacts with the detection gas in the tank; the other is that when sampling the tank, the inert gas can be used as a carrier gas to be input into the mass spectrometer 500.

[0039] In one implementation of the present embodiment, the pressure measuring device may be a gas pressure detector, which is connected to an external controller and uploads the detection data to the external controller. The temperature measuring device may be a temperature sensor, which is disposed inside the storage tank 400 and connected to the external controller. The external controller controls the temperature sensor to perform detection at a fixed time and feeds back the detected signal to the external controller. Both the pressure detection data and the temperature detection data may be uploaded to a computer.

[0040] Because the tank is a low-pressure environment, it can be approximately considered that there is an ideal gas inside the tank. According to the ideal gas state equation pV=nRT, it can be known that under the conditions of certain temperature T and container volume V, the amount of substance n and the pressure p are in a proportional single-valued relationship. Therefore, the amount of stored gas can be calculated based on the known temperature and pressure in the tank and the change in the actual pressure in the tank after storing the incoming gas. The flow rate and flow velocity entering the tank at the corresponding instantaneous time node can also be calculated based on the amount of mixed gas in different tanks.

[0041] In one implementation of this embodiment, a stirring mechanism 401 is provided in the storage tank 400. By providing the stirring mechanism 401 in the storage tank 400 to stir the mixed gas, it is possible to avoid sedimentation and separation of different molecules in the mixed gas, resulting in uneven sampling and affecting the final detection data of the mass spectrometer 500.

[0042] Specifically, the stirring mechanism 401 may include a stirring rod and a stirring blade disposed at the bottom of the stirring rod. The top of the stirring rod is driven to rotate by a stirring motor disposed at the top of the storage tank 400 , and the stirring motor is driven by a controller.

[0043] The present application also includes a method for continuously collecting and measuring mixed gases under high temperature conditions, referring to Figure 2 , shows a flow chart of the steps of a method for continuous acquisition and measurement of mixed gas under high temperature conditions in an embodiment of the present invention, using the above-mentioned measurement system, including the following steps:

[0044] S110, cooling the high-temperature mixed gas by the condensing device 100 to obtain a low-temperature mixed gas;

[0045] S120, passing the low-temperature mixed gas into the liquid collecting device 200 to separate the condensed liquid and the uncondensed mixed gas in the low-temperature mixed gas;

[0046] S130, passing the uncondensed mixed gas into the reversing device 300, and respectively delivering the uncondensed gas to the corresponding storage tank 400 at different preset times through the reversing device 300, and detecting the gas pressure and temperature in the storage tank 400, and calculating the amount of the mixed gas in the storage tank 400 and the flow rate of the mixed gas in different preset time periods;

[0047] S140, the mixed gas in the sampling storage tank 400 is sent to the mass spectrometer 500 to detect the components of the mixed gas.

[0048] In one implementation of the present embodiment, the step S130 of passing the uncondensed mixed gas into the reversing device 300, respectively delivering the uncondensed gas to the corresponding storage tank 400 at different preset times through the reversing device 300, detecting the gas pressure and temperature in the storage tank 400, and calculating the amount of the mixed gas in the storage tank 400 and the flow rate of the mixed gas in different preset time periods, specifically includes:

[0049] Inert gas is introduced into the storage tank 400, and the storage tank 400 is evacuated to maintain a negative pressure in the tank relative to the system to ensure that the incoming gas can be quickly obtained after the valve of the reversing device 300 is opened; the uncondensed mixed gas is introduced into the reversing device 300, and the uncondensed gas is respectively transported to the corresponding storage tank 400 at different preset times through the reversing device 300, so that the flow rate, concentration and other detection data of the mixed gas introduced at different time points can be detected later; the stirring mechanism 401 in the storage tank 400 is started to stir the storage tank 400. The mixed gas is stirred to make the sampled mixed gas uniform to avoid affecting the detection effect; the gas pressure and temperature in the storage tank 400 are detected. According to the ideal gas state equation pV=nRT, it can be known that under the conditions of constant temperature T and container volume V, the amount of substance n and pressure p are in a proportional single-value relationship, and the amount of substance in the mixed gas in the storage tank 400 is calculated; according to the amount of substance of the mixed gas in different storage tanks 400, the flow rate of the mixed gas in different preset time periods is calculated, and then the flow rate into the tank at different time stages can be calculated according to the flow rate. That is, the above device can measure the concentration, flow rate, flow rate and other data of the mixed gas at an instantaneous time point.

[0050] In one implementation of the present embodiment, the mixed gas in the sampled storage tank 400 described in the above step S140 is sent to the mass spectrometer 500 to perform component detection on the mixed gas, specifically including: sampling the mixed gases in different storage tanks 400, and sending the sampled mixed gases separately into the mass spectrometer 500 for component detection and analysis, so as to obtain the component data and changes of the mixed gas at different time nodes, i.e., in the instantaneous state.

[0051] In one implementation of this embodiment, the steps are also included:

[0052] The preset time, mixed gas composition, amount of substance and flow data corresponding to different storage tanks 400 are generated into a chart set through software, and the instantaneous detection data chart of the high-temperature mixed gas is obtained. The concentration, flow, flow rate, composition and other data of the mixed gas corresponding to the instantaneous time state can be intuitively observed, and it is also convenient to understand the changing state of the mixed gas at different time stages.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A system for continuous collection and measurement of mixed gases under high temperature conditions, characterized in that: It comprises a condensing device, a liquid collecting device, a reversing device and a storage tank body group connected in sequence, the gas outlet of the condensing device is connected to the gas inlet of the liquid collecting device, the gas outlet of the liquid collecting device is connected to the inlet of the reversing device, the reversing device comprises an inlet and a plurality of outlets, the storage tank body group comprises a plurality of storage tank bodies, the storage tank bodies correspond to the outlets of the reversing device one by one, and each outlet is connected to the gas inlet of one of the storage tank bodies; the storage tank bodies are externally connected to a pressure measuring device and a temperature measuring device; Also included is a continuous acquisition measurement method, comprising the following steps: The high-temperature mixed gas is cooled by a condensing device to obtain a low-temperature mixed gas; Passing the low-temperature mixed gas into a liquid collecting device to separate the condensed liquid and the uncondensed mixed gas in the low-temperature mixed gas; The uncondensed mixed gas is passed into a reversing device, and the uncondensed gas is respectively transported to corresponding storage tanks at different preset times through the reversing device, and the gas pressure and temperature in the storage tanks are detected, and the amount of the mixed gas in the storage tanks and the flow rate of the mixed gas in different preset time periods are calculated; The mixed gas in the storage tank is sampled and sent to a mass spectrometer to detect the components of the mixed gas.

2. The system for continuous acquisition and measurement of mixed gases under high temperature conditions according to claim 1 is characterized in that: The storage tank is also externally connected to a vacuum pump and an inert gas tank.

3. The system for continuous acquisition and measurement of mixed gases under high temperature conditions according to claim 2 is characterized in that: A stirring mechanism is arranged in the storage tank.

4. The system for continuous acquisition and measurement of mixed gas under high temperature conditions according to claim 1 is characterized in that: The gas inlet of the liquid collecting device is arranged at the upper part of the side wall of the liquid collecting device, and the gas outlet of the liquid collecting device is arranged at the top of the liquid collecting device.

5. The system for continuous acquisition and measurement of mixed gas under high temperature conditions according to claim 3 is characterized in that: The step of passing the uncondensed mixed gas into a reversing device, respectively delivering the uncondensed gas to corresponding storage tanks at different preset times through the reversing device, detecting the gas pressure and temperature in the storage tanks, and calculating the amount of the mixed gas in the storage tanks and the flow rate of the mixed gas in different preset time periods comprises: Introducing an inert gas into the storage tank and evacuating the storage tank; Passing the uncondensed mixed gas into a reversing device, and conveying the uncondensed gas to corresponding storage tanks at different preset times through the reversing device; Starting a stirring mechanism in the storage tank to stir the mixed gas in the storage tank; Detecting the gas pressure and temperature in the storage tank, and calculating the amount of the mixed gas in the storage tank according to the ideal gas state equation; The flow rate of the mixed gas in different preset time periods is calculated according to the amount of the mixed gas in the storage tank.

6. The system for continuous acquisition and measurement of mixed gas under high temperature conditions according to claim 1, characterized in that: The step of sampling the mixed gas in the storage tank and sending it to a mass spectrometer to detect the composition of the mixed gas includes: The mixed gases in different storage tanks are sampled, and the sampled mixed gases are separately sent to the mass spectrometer for component detection and analysis.

7. The system for continuous acquisition and measurement of mixed gases under high temperature conditions according to claim 1, characterized in that: Also includes: The preset time, mixed gas composition, amount of substance and flow rate data corresponding to different storage tanks are generated into a chart set through software to obtain an instantaneous detection data chart of the high-temperature mixed gas.

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