Gas detection system and reaction container assembly

Abstract

The invention belongs to the technical field of gas component detection, and particularly relates to a gas detection system and a reaction container assembly. The gas detection system comprises a sampling probe, a negative pressure generator, a power source pipeline, a detection pipeline and a gas return pipeline. An air inlet passage and an air return passage are formed in the sampling probe; the negative pressure generator is provided with a gas suction inlet, a power gas inlet and a mixed gas outlet; the power source pipeline is respectively connected to the power gas source and the power gas inlet and is used for introducing power gas into the negative pressure generator; the detection pipeline is respectively connected to the sampling probe and the gas suction inlet and is provided with a gas detector; the gas return pipeline is respectively communicated with the gas return passage and the mixed gas outlet so as to enable the gas to flow back through the sampling probe. In the process of detecting the to-be-detected gas components in the reaction container through the gas detection system, gas loss in the reaction container is avoided, the risk of damaging the gas atmosphere in the reaction container is reduced, the environmental protection pressure is reduced, and the gas utilization rate is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of gas component detection, and in particular, relates to a gas detection system and a reaction container assembly. Background Art

[0002] During the process of sintering precursors in a rotary kiln, the atmosphere of the rotary kiln is often tested to monitor the gas composition, temperature and pressure to ensure the safety and effectiveness of the reaction.

[0003] At present, the main method used in the market to detect gas composition is to extract the gas to be detected, but this is easy to destroy the gas atmosphere in the rotary kiln. Summary of the invention

[0004] The present application provides a gas detection system and a reaction container assembly to solve the technical problem that the existing scheme of extracting gas from the reaction container causes gas loss in the reaction container and destroys the gas atmosphere in the reaction container.

[0005] According to one aspect of the present application, a gas detection system is provided, including a sampling probe, a negative pressure generator, a power source pipeline, a detection pipeline and a return air pipeline. The sampling probe is formed with an air intake passage and a return air passage; the negative pressure generator is provided with a gas suction port, a power gas inlet and a mixed gas outlet; the power source pipeline is respectively connected to the power gas source and the power gas inlet, so as to introduce the power gas into the negative pressure generator; the detection pipeline is respectively connected to the air intake passage and the gas suction port and is provided with a gas detector; the return air pipeline is respectively connected to the return air passage and the mixed gas outlet, so as to reflux the gas through the sampling probe.

[0006] In the present application, one end of the power source pipeline, the detection pipeline and the return air pipeline are respectively connected to the power gas inlet, the gas suction port and the mixed gas outlet of the negative pressure generator. The other end of the power source pipeline is connected to the power gas source, and the other ends of the detection pipeline and the return air pipeline are both connected to the sampling probe.

[0007] In addition, at least a portion of the sampling probe can be extended into the reaction container to draw out the gas to be detected in the reaction container. The power gas source is a high-pressure gas source, and enters from the power gas inlet of the negative pressure generator through the power source pipeline. When a high-pressure gas source is introduced into the power gas inlet of the negative pressure generator, a negative pressure can be formed at the gas suction port of the negative pressure generator, that is, there is a pressure difference between the gas pressure at the gas suction port and the gas pressure in the reaction container, so that part of the gas to be detected can be extracted from the reaction container through the detection pipeline and the sampling probe.

[0008] When the gas to be tested flows through the detection pipeline, it needs to pass through the gas detector to detect the gas composition. The gas to be tested is mixed with the power gas in the negative pressure generator, flows out through the mixed gas outlet, and returns to the reaction container again through the sampling probe under the guidance of the return gas pipeline.

[0009] It can be seen that in the process of detecting the gas components to be detected in the reaction container through the gas detection system, the gas extracted from the reaction container can be mixed with the power gas and then flow back into the reaction container, thereby avoiding the loss of gas in the reaction container, reducing the risk of destroying the gas atmosphere in the reaction container, reducing environmental pressure, and improving gas utilization.

[0010] In an optional solution of the present application, the gas detection system further includes a heat exchanger, and the detection pipeline and the return gas pipeline are both connected to the sampling probe via the heat exchanger, so that the gas to be detected and the return gas can exchange heat at the heat exchanger.

[0011] In an optional solution of the present application, the heat exchanger is a heat exchange convection element, and the detection pipeline and the return air pipeline are alternately wound around the heat exchange convection element.

[0012] In an optional solution of the present application, the detection pipeline is also provided with a gas-liquid separator, and the gas-liquid separator is located between the heat exchanger and the gas detector.

[0013] In an optional scheme of the present application, the detection pipeline is also provided with a backflush control valve, which is connected to the power source pipeline and located between the gas-liquid separator and the gas detector; the backflush control valve is used to control the on-off between the detection pipeline and the power source pipeline and the on-off of the detection pipeline.

[0014] In an optional scheme of the present application, the power source pipeline is provided with a negative pressure generating control valve and a negative pressure flow regulating valve; the negative pressure generating control valve and the negative pressure flow regulating valve are both located between the junction of the backblowing control valve and the power source pipeline and between the power gas inlet, and the negative pressure generating control valve is located between the negative pressure flow regulating valve and the negative pressure generator.

[0015] In an optional solution of the present application, a return air filter is provided in the return air pipeline, and the return air filter is located between the sampling probe and the heat exchanger.

[0016] In an optional solution of the present application, the sampling probe includes a sampling filter element, an inner extension tube and an outer air pipe; the sampling filter element and the outer air pipe are respectively connected to the two ends of the inner extension tube; the detection pipeline is connected to the inner extension tube, and the return air pipeline is connected to the outer air pipe.

[0017] In an optional scheme of the present application, the outer air pipe is outermostly arranged on the inner extension pipe, and an air return passage is formed between the outer air pipe and the inner extension pipe. The air return passage is closed at one end close to the detection pipeline and open at the other end. The inner extension pipe is formed with an air intake passage, and the detection pipeline is connected to the sampling filter element via the air intake passage.

[0018] According to another aspect of the present application, a reaction container assembly is provided, characterized in that it includes a reaction container and the above-mentioned gas detection system, and the sampling probe is arranged in the reaction container and at least partially extends into the reaction container.

[0019] In summary, the gas detection system and reaction vessel assembly provided by the present application have at least the following beneficial effects:

[0020] The gas detection system is used for detecting gas components in a reaction container, and includes a sampling probe, a negative pressure generator, a power source pipeline, a detection pipeline, and a return air pipeline. The sampling probe is arranged in the reaction container and partially extends into the reaction container to introduce the gas to be detected.

[0021] The power source pipeline is connected to the power gas inlet of the negative pressure generator, providing a power source for the negative pressure generator to form negative pressure, so that the detection pipeline connected to the gas suction port of the negative pressure generator extracts the gas to be detected from the reaction container through the sampling probe. The gas to be detected can measure the gas composition through the gas detector on the detection pipeline, and then it is mixed in the negative pressure generator and returns to the reaction container through the sampling probe after passing through the return gas pipeline connected to the mixed gas outlet of the negative pressure generator.

[0022] Thus, in the process of detecting the gas components to be detected by the gas detection system, there are at least the following advantages:

[0023] First, the solution of using power gas in conjunction with a negative pressure generator to replace the existing solution of extracting the gas to be detected through devices such as fans and pumps can greatly extend the service life of the gas detection system and reduce costs;

[0024] Secondly, the gas extracted from the reaction container can be mixed with the power gas and then flow back into the reaction container, thereby avoiding gas loss in the reaction container, reducing environmental pressure, improving gas utilization, and allowing the reaction container to maintain the original atmosphere as much as possible, reducing the impact of sampling and testing on the reaction container assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific implementation or the prior art description. Obviously, the drawings described below are some implementations of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic diagram of a gas detection system provided according to one embodiment of the present application;

[0027] Figure 2 for Figure 1 A partial schematic diagram of the gas detection system in one viewing angle;

[0028] Figure 3 for Figure 1 A partial schematic diagram of the gas detection system in another perspective;

[0029] Figure 4 A cross-sectional view of a sampling probe provided according to one embodiment of the present application;

[0030] Figure 5 for Figure 3 A partial enlarged view of the S in the middle;

[0031] Figure 6 It is a partial schematic diagram of a gas detection system provided according to yet another embodiment of the present application.

[0032] The reference numerals are as follows:

[0033] 100. Gas detection system;

[0034] 10. Sampling probe; 11. Sampling filter element; 12. Inner extension tube; 13. External air pipe; 131. External air pipe joint; D1. Air inlet passage; D2. Air return passage;

[0035] 20. Negative pressure generator; 21. Gas suction port; 22. Power gas inlet; 23. Mixed gas outlet;

[0036] 30. Power source pipeline; 31. Negative pressure generation control valve; 32. Negative pressure flow regulating valve;

[0037] 40. Detection pipeline; 41. Gas detector; 42. Gas-liquid separator; 43. Backflush control valve; 44. Flow sensor;

[0038] 50. Return air pipeline; 51. Return air filter element;

[0039] 60. heat exchanger; 61. heat exchange cylinder;

[0040] 70. Drain valve; 80. Gas distribution cabinet. DETAILED DESCRIPTION

[0041] In this application, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed" and so on should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection, it can be a direct connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0042] In the description of this specification, if the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0043] At present, in the process of sintering precursors in a rotary kiln, fans or pumps are generally used as power sources in the market to extract the gas to be tested from the rotary kiln. However, the gas in the rotary kiln contains a large amount of dust, and the dust can easily cause damage to the power source device.

[0044] In addition, the gas extracted from the rotary kiln is lost, causing the gas atmosphere in the rotary kiln to change. As the number of times increases, the gas atmosphere in the rotary kiln may even be destroyed. Moreover, when the dust in the rotary kiln is a precursor material, it may also cause the loss of the precursor material.

[0045] In response to the above-mentioned problems, the present application provides a gas detection system 100. Figure 1 FIG. 1 is a schematic diagram of a gas detection system 100 provided according to one embodiment of the present application. Figure 2 for Figure 1 A partial schematic diagram of the gas detection system 100 at a certain viewing angle. Figure 3 for Figure 1 A partial schematic diagram of the gas detection system 100 from another perspective. Figure 4 It is a cross-sectional view of a sampling probe 10 provided according to one embodiment of the present application.

[0046] See also Figures 1 to 4The gas detection system 100 includes a sampling probe 10 , a negative pressure generator 20 , a power source pipeline 30 , a detection pipeline 40 and a return air pipeline 50 .

[0047] Further, the sampling probe 10 is formed with an air inlet passage D1 and an air return passage D2. The negative pressure generator 20 is provided with a gas suction port 21, a power gas inlet 22 and a mixed gas outlet 23. The power source pipeline 30 is respectively connected to the power gas source and the power gas inlet 22 to introduce the power gas into the negative pressure generator 20.

[0048] In addition, the detection pipeline 40 is connected to the air inlet passage D1 and the gas inlet 21 and is provided with a gas detector 41. The return air pipeline 50 is connected to the return air passage D2 and the mixed gas outlet 23 to return the gas through the sampling probe 10.

[0049] In this embodiment, one end of the power source pipeline 30, the detection pipeline 40 and the return air pipeline 50 are respectively connected to the power gas inlet 22, the gas suction port 21 and the mixed gas outlet 23 of the negative pressure generator 20. The other end of the power source pipeline 30 is connected to the power gas source, and the other ends of the detection pipeline 40 and the return air pipeline 50 are both connected to the sampling probe 10.

[0050] In addition, at least a portion of the sampling probe 10 can be extended into the reaction container to draw out the gas to be detected in the reaction container. The power gas source is a high-pressure gas source, and enters from the power gas inlet 22 of the negative pressure generator 20 via the power source pipeline 30. When the power gas inlet 22 of the negative pressure generator 20 is introduced with a high-pressure gas source, a negative pressure can be formed at the gas suction port 21 of the negative pressure generator 20, that is, there is a pressure difference between the gas pressure at the gas suction port 21 and the gas pressure in the reaction container, so that part of the gas to be detected can be extracted from the reaction container via the detection pipeline 40 and the sampling probe 10.

[0051] Of course, when the gas to be detected flows through the detection pipeline 40, it needs to pass through the gas detector 41. The gas detector 41 can be used to detect the total content of multiple gases in the gas to be detected, or the content of each gas in the multiple gases, or the content of a single gas. For example, the gas detector 41 can be an oxygen solubility meter, a mixed gas comprehensive detector, etc. It can be selected according to the type of gas to be detected.

[0052] The gas to be detected is mixed with the power gas in the negative pressure generator 20 , flows out through the mixed gas outlet 23 , and returns to the reaction container again through the sampling probe 10 under the guidance of the return gas pipeline 50 .

[0053] It can be seen that in the process of detecting the gas components to be detected in the reaction container through the gas detection system 100, the gas extracted from the reaction container can be mixed with the power gas and then flow back into the reaction container, thereby avoiding the loss of gas in the reaction container, reducing the risk of destroying the gas atmosphere in the reaction container, reducing environmental pressure, and improving gas utilization.

[0054] In addition, in order to maintain the gas atmosphere in the reaction container, the power gas and the gas composition in the reaction container are as similar as possible, so that the reaction container can maintain the original atmosphere as much as possible and reduce the impact of sampling and testing on the gas atmosphere in the reaction container.

[0055] Moreover, during the gas extraction process, the solution of using power gas in conjunction with a negative pressure generator replaces the existing method of extracting the gas to be detected through fans, pumps, etc., and using a high-pressure gas source as the power source for gas extraction, which can greatly extend the service life of the gas detection system 100 and reduce costs.

[0056] In a specific application, the negative pressure generator 20 may be, for example, an ejector, a venturi tube, etc. The power gas source may be selected according to the gas atmosphere in the reaction container, and it is sufficient to ensure that the gas pressure is appropriate to form a suitable suction pressure.

[0057] In a further optional embodiment, the gas detection system 100 further includes a heat exchanger 60 , and the detection pipeline 40 and the return gas pipeline 50 are both connected to the sampling probe 10 via the heat exchanger 60 , so that the gas to be detected and the return gas can exchange heat at the heat exchanger 60 .

[0058] It should be noted that the gas to be detected is generally at a high temperature because it is extracted from a reaction container. If the temperature of the gas to be detected exceeds the temperature threshold allowed by the gas detector 41, the life of the gas detector 41 will be shortened or even damaged. Therefore, in order to ensure the service life of the gas detector 41, it is necessary to cool the gas to be detected so that the temperature of the gas to be detected is within the temperature threshold allowed by the gas detector 41.

[0059] In addition, the temperature of the power gas is lower than the temperature of the gas to be detected, so the temperature of the mixed gas after the power gas and the gas to be detected is also lower than the temperature of the gas to be detected. That is, the temperature of the detection pipeline 40 is higher than the temperature of the return gas pipeline 50.

[0060] In this embodiment, the heat exchanger 60 is both a part of the detection pipeline 40 and a part of the return gas pipeline 50, that is, the detection pipeline 40 and the return gas pipeline 50 share the heat exchanger 60, and the two perform heat exchange at the heat exchanger 60. In this way, the gas to be detected with a relatively high temperature in the detection pipeline 40 and the mixed gas with a relatively low temperature in the return gas pipeline 50 perform heat exchange at the heat exchanger 60 to reduce the temperature of the gas to be detected, ensuring that the temperature of the gas to be detected is within the temperature threshold allowed by the gas detector 41. In addition, the temperature of the mixed gas is increased, reducing the risk of large temperature fluctuations in the reaction container due to the low temperature of the mixed gas refluxed into the reaction container.

[0061] Furthermore, there is no need to add additional heat exchange medium to achieve heat exchange, thus reducing the use cost of the gas detection system 100 .

[0062] In a further optional embodiment, the heat exchanger 60 is a heat exchanger convection element, and the detection pipeline 40 and the return air pipeline 50 are alternately wound on the heat exchange convection element. Exemplarily, the heat exchange convection element can be a heat exchange convection plate or a heat exchange convection tube.

[0063] It should be noted that the heat exchange convection element is provided with a heat exchange tube 61 and two groups of pipelines alternately wound around the heat exchange tube 61 , and the two groups of pipelines are respectively a part of the detection pipeline 40 and a part of the return air pipeline 50 .

[0064] It can be understood that the alternating winding of the two groups of pipelines can ensure the heat exchange time between the detection pipeline 40 and the return air pipeline 50 and ensure the heat exchange efficiency.

[0065] In a specific application, the heat exchange tube 61 and the two sets of pipes wound around the heat exchange tube 61 are made of materials with high heat exchange efficiency, such as stainless steel.

[0066] In a further optional embodiment, the detection pipeline 40 is further provided with a gas-liquid separator 42 , and the gas-liquid separator 42 is located between the heat exchanger 60 and the gas detector 41 .

[0067] In this embodiment, the detection pipeline 40 also has a gas-liquid separator 42 located between the heat exchanger 60 and the gas detector 41. In this way, the gas to be detected introduced through the sampling probe 10 first passes through the heat exchanger 60, and then passes through the gas-liquid separator 42 before flowing to the gas detector 41. The gas-liquid separator 42 can separate the liquid in the gas to be detected.

[0068] It is understandable that after the gas to be detected is cooled by the heat exchanger 60 , condensation may occur, so the liquid in the gas to be detected is separated by the gas-liquid separator 42 to ensure the accuracy of the detection result of the gas detector 41 .

[0069] In a further optional embodiment, the gas detection system 100 further includes a drain valve 70 , which is connected to the gas-liquid separator 42 to control the discharge of liquid in the gas-liquid separator 42 .

[0070] It should be noted that the liquid separated by the gas-liquid separator 42 needs to be discharged, and the gas-liquid separator 42 is provided with a liquid discharge port for discharging the liquid. In this embodiment, the liquid discharge valve 70 is connected to the liquid discharge port of the gas-liquid separator 42, and when liquid discharge is required, the liquid discharge valve 70 can be opened.

[0071] In the illustrated embodiment, the drain valve 70 is a manual ball valve, but it is not limited thereto and an electronic ball valve may also be used to open it electrically.

[0072] See also Figure 4 The sampling probe 10 includes a sampling filter element 11 , an inner extension tube 12 and an outer air tube 13 .

[0073] The sampling filter element 11 and the external air pipe 13 are respectively connected to the two ends of the inner extension pipe 12 , the detection pipeline 40 is connected to the inner extension pipe 12 , and the return air pipeline 50 is connected to the external air pipe 13 .

[0074] In this embodiment, the sampling probe 10 at least comprises a sampling filter element 11, an inner extension tube 12 and an outer air pipe 13. The sampling filter element 11 is used to filter dust in the gas to be detected extracted from the reaction container, and the inner extension tube 12 can be extended into the reaction container to place the sampling filter element 11 in the desired extraction position.

[0075] The detection pipeline 40 is connected to the inner extension tube 12. After the detection gas is filtered by the sampling filter element 11, it flows into the detection pipeline 40 through the inner extension tube 12. The return gas pipeline 50 is connected to the external gas pipe 13. In a specific application, the external gas pipe 13 is arranged on the outer peripheral wall of the reaction container and connected to the reaction container, so that the mixed gas in the return gas pipeline 50 can flow back into the reaction container through the external gas pipe 13.

[0076] In a further optional embodiment, the outer air pipe 13 is placed outside the inner extension pipe 12, and a return air passage D2 is formed between the outer air pipe 13 and the inner extension pipe 12, and the return air passage D2 is closed at one end close to the detection pipeline 40 and opened at the other end. The inner extension pipe 12 is formed with an air inlet passage D1, and the detection pipeline 40 is connected to the sampling filter element 11 via the air inlet passage D1.

[0077] In this embodiment, the outer air pipe 13 is placed outside the end of the inner extension pipe 12 away from the sampling filter element 11, and a return air passage D2 is formed between the outer air pipe 13 and the inner extension pipe 12, and an inner and outer double-layer air passage structure is formed in cooperation with the air inlet passage D1. In addition, one end of the return air passage D2 is open and the other end is closed. When the outer air pipe 13 is installed on the outer peripheral wall of the reaction container, the open end of the return air passage D2 is located inside the reaction container.

[0078] The return air passage D2 is connected to the return air pipeline 50, and the inner extension pipe 12 is connected to the intake air passage D1. The mixed gas in the return air pipeline 50 and the gas to be detected in the detection pipeline 40 do not conflict at the sampling probe 10, that is, the sampling probe 10 can be used to both sample and reflux the mixed gas.

[0079] It can be understood that the mixed gas in the return air pipeline 50 can enter the reaction container through the return air passage D2 and from the open end of the return air passage D2. In addition, the sampling position is where the sampling filter element 11 is located, the return air position is at the opening of the return air passage D2, and there is an inner extension tube 12 between the sampling position and the return air position.

[0080] In other words, the sampling position and the air return position are set at different positions through the inner extension tube 12, so that the reliability of the sample extracted can be avoided from being affected by the air return during sampling.

[0081] In addition, Figure 4 In the illustrated embodiment, an outer circumferential wall of the outer air pipe 13 is provided with an outer air pipe joint 131 , which is used to cooperate with the return air pipeline 50 to achieve communication between the return air pipeline 50 and the outer air pipe 13 .

[0082] Figure 5 for Figure 3 A partial enlarged view of the S in the figure. Figure 5 In some optional embodiments, the detection pipeline 40 is also provided with a back-blowing control valve 43 , which is connected to the power source pipeline 30 and is located between the gas-liquid separator 42 and the gas detector 41 .

[0083] The blowback control valve 43 is used to control the on-off between the detection pipeline 40 and the power source pipeline 30 and the on-off of the detection pipeline 40 .

[0084] In this embodiment, the detection pipeline 40 is further provided with a back-blowing control valve 43, and is connected to the power source pipeline 30 through the back-blowing control valve 43. The back-blowing control valve 43 can introduce power gas into the detection pipeline 40 according to demand to achieve back-blowing, and then blow the dust adsorbed in the sampling filter element 11 in the sampling probe 10 into the reaction container, thereby avoiding material loss, extending the service life of the filter element, reducing the frequency of filter element replacement, and reducing costs.

[0085] When backflush is not needed, the backflush control valve 43 separates the power source pipeline 30 from the detection pipeline 40 , and the detection pipeline 40 is in a connected state, so that the gas to be detected can be extracted normally.

[0086] When backblowing is required, the backblowing control valve 43 connects the power source pipeline 30 with the detection pipeline 40 and isolates the detection pipeline 40, so that the power gas enters the detection pipeline 40. Since the backblowing control valve 43 is located between the gas-liquid separator 42 and the gas detector 41, the power gas will not flow to the gas detector 41, but can only flow to the sampling probe 10, thereby realizing backblowing of the sampling filter element 11.

[0087] In a specific application, the blowback control valve 43 is a multi-way electromagnetic control valve, which realizes the state switching between connection and isolation through electric control. Of course, the blowback control valve 43 can also be a combination of multiple electromagnetic control valves.

[0088] In a further optional embodiment, the power source pipeline 30 is provided with a negative pressure generating control valve 31 and a negative pressure flow regulating valve 32. The negative pressure generating control valve 31 and the negative pressure flow regulating valve 32 are both located between the junction of the back-blowing control valve 43 and the power source pipeline 30 and the power gas inlet 22, and the negative pressure generating control valve 31 is located between the negative pressure flow regulating valve 32 and the negative pressure generator 20.

[0089] In this embodiment, the power source pipeline 30 has at least a negative pressure generating control valve 31 and a negative pressure flow regulating valve 32. The negative pressure generating control valve 31 is used to control the on-off of the power source pipeline 30, and the negative pressure generating control valve 31 is used to control the pressure of the power gas entering the negative pressure generator 20.

[0090] It should be understood that the greater the pressure of the power gas entering the negative pressure generator 20, the greater the negative pressure formed at the gas suction port 21 of the negative pressure generator 20, and the more gas to be detected is extracted. Therefore, the pressure of the power gas entering the negative pressure generator 20 is controlled by the negative pressure flow regulating valve 32 to control the negative pressure at the gas suction port of the negative pressure generator 20, thereby controlling the flow rate of the gas to be detected.

[0091] It can be understood that the gas to be detected can be extracted by controlling the on and off of the negative pressure generating control valve 31 according to the demand. In a specific application, the negative pressure generating control valve 31 is a start-stop solenoid valve, and the negative pressure flow regulating valve 32 is a knob flow regulating valve, and the flow rate, that is, the pressure of the power gas, can be adjusted by rotating the knob.

[0092] In addition, the junction of the back-blowing control valve 43 and the power source pipeline 30 is located upstream of the negative pressure flow regulating valve 32, where the upstream is determined by the flow direction of the power gas. In other words, the back-blowing pressure is determined by the pressure of the power gas source, that is, the back-blowing pressure is the pressure of the power gas source, and the back-blowing pressure is relatively large to ensure that the dust adsorbed in the sampling filter element 11 is back-blown back into the reaction container as much as possible.

[0093] In a further optional embodiment, the detection pipeline 40 is further provided with a flow sensor 44 , and the flow sensor 44 is located between the gas detector 41 and the negative pressure generator 20 .

[0094] In this embodiment, the flow sensor 44 is used to monitor the gas flow in the detection pipeline 40. The flow data of the gas to be detected is obtained by the flow sensor 44 to judge the rationality and accuracy of the detection data and provide a basis for adjusting the negative pressure flow control valve 32.

[0095] In some optional embodiments, the return air pipeline 50 is provided with a return air filter 51 , and the return air filter 51 is located between the sampling probe 10 and the heat exchanger 60 .

[0096] In this embodiment, the mixed gas is filtered by the return air filter 51 to prevent metal foreign matter in the pipeline from entering the reaction container and the mixed gas entering the reaction container from polluting the gas atmosphere in the reaction container.

[0097] Combination Figure 1 and Figure 4 In the illustrated embodiment, the return air filter 51 is connected to the external air pipe 13 in the sampling probe 10 , specifically connected to the external air pipe connector 131 and communicated with the return air passage D2 .

[0098] Figure 6 FIG. 1 is a partial schematic diagram of a gas detection system 100 provided according to another embodiment of the present application. Figure 6 In the illustrated embodiment, the return air filter 51 is connected to the heat exchanger 60. It can be seen that the return air filter 51 can be arranged between the sampling probe 10 and the heat exchanger 60.

[0099] Compared with the two solutions of setting the return air filter 51 at the sampling probe 10 and the heat exchanger 60, when the return air filter 51 is installed at the sampling probe 10, the return air filter 51 is at the end of the entire return air pipeline 50, which can reduce the risk of foreign matter remaining in the pipeline entering the reaction container. When the return air filter 51 is installed at the heat exchanger 60, the high temperature radiation of the reaction container has less impact on the return air filter 51, and the service life of the return air filter 51 is relatively extended.

[0100] Please refer to the accompanying drawings. The gas detection system 100 provided in the present application also has a gas distribution cabinet 80. The negative pressure generator 20, the gas circuit control and monitoring functional components in each pipeline, and the heat exchanger 60 are all integrated in the gas distribution cabinet 80 for easy maintenance.

[0101] Another aspect of the present application further provides a reaction container assembly, which includes a reaction container and the above-mentioned gas detection system 100 , wherein the sampling probe 10 is disposed in the reaction container and at least partially extends into the reaction container.

[0102] As can be seen from the above, the sampling filter element 11 in the sampling probe 10, most of the inner extension tube 12 and part of the outer gas tube 13 extend into the reaction container to achieve the introduction of the gas to be detected, backblowing and gas reflux.

[0103] It should be noted that the reaction vessel assembly also has a controller, which is connected to the negative pressure generating control valve 31, the gas detector 41, the back-blowing control valve 43, the flow sensor 44, etc. to realize functions such as air extraction, back-blowing, and data monitoring. In specific applications, the controller adopts a programmable logic controller (PLC).

[0104] Obviously, the reaction vessel assembly obviously has all the advantages brought by the above-mentioned gas detection system 100, such as avoiding the loss of gas and material in the reaction vessel. In addition, it should be noted that the reaction vessel here can refer to a rotary kiln, an oven, a reactor, etc. The temperature of the gas to be detected extracted from these reaction vessels is generally high, and the gas detection system 100 can cool down the extracted gas to be detected. All the above advantages are not listed one by one here.

[0105] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A gas detection system, characterized in that: include: The sampling probe (10) is formed with an air inlet passage (D1) and an air return passage (D2); A negative pressure generator (20) is provided with a gas suction port (21), a power gas inlet (22) and a mixed gas outlet (23); A power source pipeline (30) is connected to a power gas source and the power gas inlet (22) respectively, so as to introduce the power gas into the negative pressure generator (20); a detection pipeline (40) which is respectively connected to the air inlet passage (D1) and the gas suction port (21) and is provided with a gas detector (41); and The gas return pipeline (50) is respectively connected to the gas return passage (D2) and the mixed gas outlet (23) so as to return the gas through the sampling probe (10).

2. The gas detection system according to claim 1, characterized in that: It also includes a heat exchanger (60), and the detection pipeline (40) and the return gas pipeline (50) are both connected to the sampling probe (10) via the heat exchanger (60), so that the gas to be detected and the return gas can exchange heat at the heat exchanger (60).

3. The gas detection system according to claim 2, characterized in that: The heat exchanger (60) is a heat exchange convection element, and the detection pipeline (40) and the return air pipeline (50) are alternately wound around the heat exchange convection element.

4. The gas detection system according to claim 2, characterized in that: The detection pipeline (40) is also provided with a gas-liquid separator (42), and the gas-liquid separator (42) is located between the heat exchanger (60) and the gas detector (41).

5. The gas detection system according to claim 4, characterized in that: The detection pipeline (40) is also provided with a backflush control valve (43), and the backflush control valve (43) is connected to the power source pipeline (30) and is located between the gas-liquid separator (42) and the gas detector (41); The blowback control valve (43) is used to control the on-off between the detection pipeline (40) and the power source pipeline (30) and the on-off of the detection pipeline (40).

6. The gas detection system according to claim 5, characterized in that: The power source pipeline (30) is provided with a negative pressure generation control valve (31) and a negative pressure flow regulating valve (32); The negative pressure generating control valve (31) and the negative pressure flow regulating valve (32) are both located between the junction of the back-blowing control valve (43) and the power source pipeline (30) and between the power gas inlet (22), and the negative pressure generating control valve (31) is located between the negative pressure flow regulating valve (32) and the negative pressure generator (20).

7. The gas detection system according to claim 2, characterized in that: The return air pipeline (50) is provided with a return air filter (51), and the return air filter (51) is located between the sampling probe (10) and the heat exchanger (60).

8. The gas detection system according to claim 1, characterized in that: The sampling probe (10) comprises a sampling filter element (11), an inner extension tube (12) and an outer air tube (13); The sampling filter element (11) and the external air pipe (13) are respectively connected to the two ends of the inner extension pipe (12); the detection pipeline (40) is connected to the inner extension pipe (12), and the return air pipeline (50) is connected to the external air pipe (13).

9. The gas detection system according to claim 8, characterized in that: The outer air pipe (13) is disposed outside the inner extension pipe (12), and an air return passage (D2) is formed between the outer air pipe (13) and the inner extension pipe (12), wherein one end of the air return passage (D2) close to the detection pipeline (40) is closed, and the other end is open; The inner extension tube (12) is formed with an air intake passage (D1), and the detection pipeline (40) is connected to the sampling filter element (11) via the air intake passage (D1).

10. A reaction vessel assembly, characterized in that: It comprises a reaction container and a gas detection system (100) according to any one of claims 1 to 9, wherein the sampling probe (10) is arranged in the reaction container and at least partially extends into the reaction container.

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