Gas moisture on-line detection device and detection method

Abstract

The application discloses a kind of gas moisture online detection device and detection method, including measured flue gas pipeline, still including that gas sampling pump, gas filter device, first heat exchange unit, first gas flowmeter, throttling adsorption device, second gas flowmeter, second heat exchange unit and detection chamber are sequentially connected by pipeline, the gas inlet end of gas sampling pump is connected with measured flue gas pipeline by pipeline, and the detection probe of resistance-capacitance type dew point instrument is located in detection chamber, and the gas outlet end of detection chamber is connected with measured flue gas pipeline by pipeline.The application can effectively remove ash and dust in gas and corrosive acidic gas, and can reduce gas temperature, so that gas meets the requirement of resistance-capacitance type dew point instrument online detection.

Description

TECHNICAL FIELD

[0001] The present application relates to a detection device and a detection method, in particular to a gas moisture on-line detection device and a detection method. BACKGROUND

[0002] Dry ice expanded cut tobacco process is an important technology in tobacco industry. The process can effectively remove the offensive odor in cut tobacco, improve the product quality of cigarettes, and reduce the tar content in cut tobacco. However, due to the use of steam to exchange heat with dry ice to sublimate carbon dioxide in the production process, it is easy to cause the final moisture content of cut tobacco to be unstable, which brings adverse effects to production. At present, the moisture in gas is mainly measured by a resistance-capacitance type dew point instrument. The working conditions of such instruments are mostly below 180℃. High temperature (above 180℃), corrosive, and containing interfering components will seriously affect the testing accuracy, stability and service life of the instrument.

[0003] The working gas in the dry ice expanded cut tobacco process has high temperature, high moisture content, ash and dust, and corrosive acidic gas. According to the above characteristics, it is known that the existing resistance-capacitance type dew point instrument cannot be directly applied to the moisture detection under this condition. There are few reports on the gas moisture detection device for this working condition. The general high-temperature gas moisture detection system only cools by simple heat exchange, and cannot realize the filtration and automatic cleaning of dust in the gas and the removal of acidic components in the gas to meet the online detection requirements of the resistance-capacitance type dew point instrument. SUMMARY

[0004] The purpose of the present application is to provide a gas moisture on-line detection device and a detection method to solve the technical problems in the prior art, which can effectively remove the ash and dust and corrosive acidic gas in the gas, and can also reduce the gas temperature to meet the online detection requirements of the resistance-capacitance type dew point instrument.

[0005] The present application provides a gas moisture on-line detection device, which comprises a measured flue gas pipeline, and further comprises a gas sampling pump, a gas filtration device, a first heat exchange unit, a first gas flow meter, a throttling adsorption device, a second gas flow meter, a second heat exchange unit and a detection chamber connected in sequence through pipelines. The gas inlet end of the gas sampling pump is connected with the measured flue gas pipeline through a pipeline, the detection probe of the resistance-capacitance type dew point instrument is arranged in the detection chamber, and the gas outlet end of the detection chamber is connected with the measured flue gas pipeline through a pipeline.

[0006] Preferably, in the aforementioned gas moisture on-line detection device, the gas filtering device comprises a first gas filter and a second gas filter, the first gas filter is provided with a first control valve on the connecting pipeline of the gas sampling pump, the second gas filter is provided with a second control valve on the connecting pipeline of the gas sampling pump, the first gas filter is provided with a third control valve on the connecting pipeline of the first heat exchange unit, and the second gas filter is provided with a fourth control valve on the connecting pipeline of the first heat exchange unit.

[0007] Preferably, in the aforementioned gas moisture on-line detection device, the first gas filter and the second gas filter are completely identical in structure, and both are internally provided with a sintered stainless steel filter core.

[0008] Preferably, in the aforementioned gas moisture on-line detection device and detection method, the first heat exchange unit is a spiral fin tube heat exchanger.

[0009] Preferably, in the aforementioned gas moisture on-line detection device, the throttling adsorption device comprises a first throttling adsorption pipe and a second throttling adsorption pipe, the first throttling adsorption pipe and the second throttling adsorption pipe are completely identical in structure, and both comprise a gas filter core, a throttling capillary, a spiral coil, a molecular sieve filler and a shell, the gas filter core, the throttling capillary and the molecular sieve filler are sequentially arranged in the shell, the spiral coil is arranged in the molecular sieve filler, the gas inlet end and the gas outlet end of the spiral coil are both located outside the shell, the shell is provided with a purge gas inlet and a purge gas outlet, the purge gas outlet is located at the same end as the gas filter core, the purge gas inlet is located at the same end as the molecular sieve filler, the shell is further provided with a throttling adsorption pipe gas inlet and a throttling adsorption pipe gas outlet, the throttling adsorption pipe gas inlet is connected with the gas filter core, and the throttling adsorption pipe gas outlet is located at the same end as the purge gas inlet.

[0010] Preferably, in the aforementioned gas moisture on-line detection device, the gas inlet end of the spiral coil in the first throttling adsorption pipe is provided with a fifth control valve on the connecting pipeline of the first gas flow meter, the gas outlet end of the spiral coil is connected with the throttling adsorption pipe gas inlet in the second throttling adsorption pipe through a pipeline, the throttling adsorption pipe gas outlet in the second throttling adsorption pipe is provided with a sixth control valve on the connecting pipeline of the second gas flow meter, the gas inlet end of the spiral coil in the second throttling adsorption pipe is provided with a seventh control valve on the connecting pipeline of the first gas flow meter, the gas outlet end of the spiral coil is connected with the throttling adsorption pipe gas inlet in the first throttling adsorption pipe through a pipeline, and the throttling adsorption pipe gas outlet in the first throttling adsorption pipe is provided with an eighth control valve on the connecting pipeline of the second gas flow meter.

[0011] Preferably, the gas moisture on-line detection device further comprises a first high-pressure air tank and a second high-pressure air tank, the first high-pressure air tank is connected with the first gas filter and the first throttling adsorption pipe, and the second high-pressure air tank is connected with the second gas filter and the second throttling adsorption pipe.

[0012] Preferably, the second heat exchange unit is a shell-and-tube heat exchanger, a temperature controller is connected to the second heat exchange unit, and an electric heating jacket is sleeved on the connecting pipeline between the second heat exchange unit and the detection chamber; an on-line humidity detection sensor is installed in the detection chamber, and a temperature transmitter is further connected to the detection chamber.

[0013] A detection method based on the gas moisture on-line detection device comprises the following steps: a gas sampling pump draws gas in a measured flue gas pipeline and sends the gas to a gas filter device, particles with a diameter greater than 10 microns in the gas are filtered out when passing through the gas filter device, then the gas passes through a first heat exchange unit for primary cooling, the cooled gas enters a throttling adsorption device through a first gas flow meter, acidic components in the gas are removed through the throttling adsorption device, then the gas enters a second heat exchange unit through a second gas flow meter, the gas is cooled again in the second heat exchange unit, the cooled gas enters a detection chamber, a blocking-capacity dew point instrument on-line detects the moisture content in the gas in the detection chamber, and the gas returns to the measured flue gas pipeline after passing through the detection chamber.

[0014] Preferably, the gas filter device comprises a first gas filter and a second gas filter, the second gas filter performs a back-blowing cleaning operation when the gas passes through the first gas filter for filtering, the first gas filter performs a back-blowing cleaning operation when the gas passes through the second gas filter for filtering; the throttling adsorption device comprises a first throttling adsorption pipe and a second throttling adsorption pipe, the second throttling adsorption pipe performs a back-blowing cleaning operation when the gas passes through the first throttling adsorption pipe for removing acidic components, and the first throttling adsorption pipe performs a back-blowing cleaning operation when the gas passes through the second throttling adsorption pipe for removing acidic components.

[0015] Compared with the prior art, the gas moisture on-line detection device can remove dust and ash in the gas through the gas filter device, remove acidic components in the gas through the throttling adsorption device, and accurately control and maintain the temperature of the gas through the first heat exchange unit and the second heat exchange unit, so that the temperature of the gas is reduced to the requirement of the on-line detection of the blocking-capacity dew point instrument, and the test accuracy, stability and service life of the blocking-capacity dew point instrument are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1is a structural schematic diagram of the present application;

[0017] Figure 2 is a structural schematic diagram of the throttling adsorption tube.

[0018] Reference signs: 1-gas sampling pump, 2-first gas filter, 3-second gas filter, 4-first high-pressure air tank, 5-second high-pressure air tank, 6-first heat exchange unit, 7-first throttling adsorption tube, 8-second throttling adsorption tube, 9-second heat exchange unit, 10-electric heating jacket, 11-detection chamber, 12-temperature transmitter, 13-temperature controller, 14-first gas flow meter, 15-second gas flow meter, 16-throttling adsorption tube gas inlet, 17-throttling adsorption tube gas outlet, 18-purge gas inlet, 19-purge gas outlet, 20-gas filter core, 21-throttling capillary, 22-circular groove, 23-spiral coil, 24-molecular sieve filler, 25-measured flue gas pipeline, 26-first control valve, 27-second control valve, 28-third control valve, 29-fourth control valve, 30-housing, 31-fifth control valve, 32-sixth control valve, 33-seventh control valve, 34-eighth control valve, 35-resistance-capacitance type dew point meter, 36-ninth control valve, 37-tenth control valve, 38-eleventh control valve, 39-twelfth control valve. DETAILED DESCRIPTION

[0019] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be interpreted as a limitation on the present application.

[0020] Embodiments of the present application: as shown in Figure 1 and Figure 2 A gas moisture on-line detection device, comprising a measured flue gas pipeline 25, further comprising a gas sampling pump 1, a gas filtering device, a first heat exchange unit 6, a first gas flow meter 14, a throttling adsorption device, a second gas flow meter 15, a second heat exchange unit 9 and a detection chamber 11 connected in sequence through pipelines, the first heat exchange unit 6 and the second heat exchange unit 9 are both commercially available products, which can be directly purchased, the first heat exchange unit 6 can adopt a spiral fin tube heat exchanger, and the second heat exchange unit 9 can adopt a tube-shell heat exchanger, the gas inlet end of the gas sampling pump 1 is connected with the measured flue gas pipeline 25 through a pipeline, a detection probe of a resistance-capacitance type dew point meter 35 is arranged in the detection chamber 11, the gas outlet end of the detection chamber 11 is connected with the measured flue gas pipeline 25 through a pipeline, and the connection position of the detection chamber 11 and the measured flue gas pipeline 25 is located downstream of the connection position of the gas sampling pump 1 and the measured flue gas pipeline 25.

[0021] The gas generated in the dry ice expanded tobacco process is transported through the measured flue gas pipeline 25, part of the gas is drawn into the pipeline by the gas sampling pump 1 and sequentially passes through the gas filter device, the first heat exchange unit 6, the first gas flow meter 14, the throttling adsorption device, the second gas flow meter 15, the second heat exchange unit 9 and the detection chamber 11. When the gas passes through the gas filter device, the gas filter device removes the dust and ash in the gas. When the gas passes through the throttling adsorption device, the throttling adsorption device removes the acidic components in the gas. The gas passes through the first heat exchange unit 6 and the second heat exchange unit 9, and after two heat exchanges, the temperature of the gas is brought to the temperature required for online detection by the resistance-capacitance type dew point meter, ensuring the test accuracy, stability and service life of the resistance-capacitance type dew point meter. After detection, the gas is returned to the measured flue gas pipeline 25, and there is no waste gas emission.

[0022] In a specific embodiment, the gas filter device comprises a first gas filter 2 and a second gas filter 3. The first control valve 26 is arranged on the connecting pipeline of the first gas filter 2 and the gas sampling pump 1. The second control valve 27 is arranged on the connecting pipeline of the second gas filter 3 and the gas sampling pump 1. The third control valve 28 is arranged on the connecting pipeline of the first gas filter 2 and the first heat exchange unit 6. The fourth control valve 29 is arranged on the connecting pipeline of the second gas filter 3 and the first heat exchange unit 6. The first gas filter 2 and the second gas filter 3 are completely identical in structure, and both are internally installed with sintered stainless steel filter elements.

[0023] In this embodiment, by opening the first control valve 26 and the third control valve 28 and closing the second control valve 27 and the fourth control valve 29, the gas passes through the first gas filter 2. At this time, the gas filters dust and ash through the first gas filter 2. At this time, the second gas filter 3 performs a backflushing cleaning operation. The specific backflushing cleaning operation will be described below. Similarly, by closing the first control valve 26 and the third control valve 28 and opening the second control valve 27 and the fourth control valve 29, the gas flows through the second gas filter 3, and the dust and ash are filtered through the second gas filter 3. At this time, the first control valve 26 performs a backflushing cleaning operation.

[0024] The advantage of this structure is that by switching the working state of the first gas filter 2 and the second gas filter 3, uninterrupted filtration can be achieved, and frequent replacement of sintered stainless steel filter elements can be effectively avoided, reducing manual operation. It should be noted that the above embodiment is a preferred embodiment, and of course only one gas filter can be provided, and the sintered stainless steel filter element can be manually replaced periodically.

[0025] Further, the first heat exchange unit 6 is a spiral finned tube heat exchanger, which is in natural convection with air to radiate and cool the gas. Generally, the temperature of the gas can be reduced to 220-250 degrees after passing through the first heat exchange unit 6.

[0026] Further, the throttling adsorption device comprises a first throttling adsorption pipe 7 and a second throttling adsorption pipe 8, which are completely identical in structure. Both of them comprise a gas filter core 20, a throttling capillary tube 21, a spiral coil 23, a molecular sieve filler 24 and a shell 30. The gas filter core 20, the throttling capillary tube 21 and the molecular sieve filler 24 are sequentially arranged in the shell 30 from one end to the other end. A circular groove 22 is formed at the end of the throttling capillary tube 21 connected with the molecular sieve filler 24. The spiral coil 23 is arranged in the molecular sieve filler 24. The gas inlet end and the gas outlet end of the spiral coil 23 are both located outside the shell 30. The shell 30 is provided with a purge gas inlet 18 and a purge gas outlet 19. The purge gas outlet 19 is located at the same end with the gas filter core 20. The purge gas inlet 18 is located at the same end with the molecular sieve filler 24. The shell 30 is also provided with a throttling adsorption pipe gas inlet 16 and a throttling adsorption pipe gas outlet 17. The throttling adsorption pipe gas inlet 16 is inserted into the gas filter core 20 at one end in the shell 30. The throttling adsorption pipe gas outlet 17 is located at the same end with the purge gas inlet 18.

[0027] The gas inlet end of the spiral coil 23 in the first throttling adsorption pipe 7 is provided with a fifth control valve 31 on the connecting pipeline of the first gas flow meter 14. The gas outlet end of the spiral coil 23 is connected with the throttling adsorption pipe gas inlet 16 in the second throttling adsorption pipe 8 through a pipeline. The throttling adsorption pipe gas outlet 17 in the second throttling adsorption pipe 8 is provided with a sixth control valve 32 on the connecting pipeline of the second gas flow meter 15. The gas inlet end of the spiral coil 23 in the second throttling adsorption pipe 8 is provided with a seventh control valve 33 on the connecting pipeline of the first gas flow meter 14. The gas outlet end of the spiral coil 23 is connected with the throttling adsorption pipe gas inlet 16 in the first throttling adsorption pipe 7 through a pipeline. The throttling adsorption pipe gas outlet 17 in the first throttling adsorption pipe 7 is provided with an eighth control valve 34 on the connecting pipeline of the second gas flow meter 15.

[0028] When the seventh control valve 33 and the eighth control valve 34 are closed, and the fifth control valve 31 and the sixth control valve 32 are opened, the gas first enters the spiral coil 23 in the first throttling adsorption pipe 7, and then enters the shell 30 of the second throttling adsorption pipe 8, in the second throttling adsorption pipe 8, the gas first passes through the gas filter core 20, and then passes through the throttling capillary tube 21, and then the gas is expanded and redistributed at the circular groove 22, and then the acidic gas is adsorbed and desorbed when the gas passes through the molecular sieve filler 24. The surface of the molecular sieve filler 24 is treated with alkali, and the adsorption temperature is high during work, so that water is avoided to be adsorbed and lost. At the same time, high-pressure gas is introduced into the shell 30 of the first throttling adsorption pipe 7 to realize the back flushing cleaning of the first throttling adsorption pipe 7.

[0029] Similarly, when the seventh control valve 33 and the eighth control valve 34 are opened, and the fifth control valve 31 and the sixth control valve 32 are closed, the gas first enters the spiral coil 23 in the second throttling adsorption pipe 8, and then enters the shell 30 of the first throttling adsorption pipe 7, and realizes the removal of the acidic components, at this time, the second throttling adsorption pipe 8 performs the back flushing cleaning operation.

[0030] The application sets two parallel switchable throttling adsorption devices, realizes continuous operation. By switching the working pipeline in turn, the heat of the gas itself is fully utilized, and the alternating adsorption and desorption of the acidic gas can be realized.

[0031] The back flushing structure is described in detail below. The embodiment also includes a first high-pressure air tank 4 and a second high-pressure air tank 5. The first high-pressure air tank 4 is connected to the back flushing interface of the first gas filter 2 through a pipeline, and the ninth control valve 36 is arranged on the pipeline. The first high-pressure air tank 4 is also connected to the purge gas inlet 18 on the first throttling adsorption pipe 7 through another pipeline, and the eleventh control valve 38 is arranged on the pipeline. The second high-pressure air tank 5 is connected to the back flushing interface of the second gas filter 3 through a pipeline, and the tenth control valve 37 is arranged on the pipeline. The second high-pressure air tank 5 is also connected to the purge gas inlet 18 on the second throttling adsorption pipe 8 through another pipeline, and the twelfth control valve 39 is arranged on the pipeline. The back flushing gas outlet is arranged on the first gas filter 2 and the second gas filter 3, and the control valve is arranged on the back flushing gas outlet. The control valve is also arranged on the purge gas outlet 19 of the first throttling adsorption pipe 7 and the second throttling adsorption pipe 8. The reverse purge work of different devices is realized by opening and closing the corresponding control valve. For example, when the first throttling adsorption pipe 7 is purged, the eleventh control valve 38 and the control valve on the purge gas outlet 19 are opened, the high-pressure gas in the first high-pressure air tank 4 enters the shell 30 of the first throttling adsorption pipe 7, the acid gas is desorbed by back flushing, the self-cleaning of the gas filter element is realized, and the device is cooled after desorption. The ninth control valve 36 and the control valve on the back flushing gas outlet of the first gas filter 2 are opened, and the dust and ash captured by the sintered stainless steel filter element in the first gas filter 2 can be blown out through the high-pressure gas, and then discharged through the back flushing gas outlet.

[0032] Furthermore, the second heat exchange unit 9 is a tube-shell heat exchanger, and a control loop is arranged. The temperature controller 13 is connected to the second heat exchange unit 9, and the opening degree of the heat conduction medium flow control valve is controlled by the temperature controller 13. The flow of the heat conduction medium is adjusted, the heat exchange amount is accurately controlled, and the gas temperature is not higher than 180℃. The electric heating sleeve 10 is sleeved on the connecting pipeline between the second heat exchange unit 9 and the detection chamber 11. The gas temperature is not lower than 110℃ by the electric heating sleeve 10, so as to avoid water loss or damage to the sensor caused by dewing. The online humidity detection sensor is installed in the detection chamber 11, and the temperature transmitter 12 is also connected to the detection chamber 11, so as to monitor the gas temperature in the detection chamber 11 in real time.

[0033] A detection method based on the above-mentioned gas moisture online detection device includes: the gas sampling pump 1 draws the gas in the measured flue gas pipeline 25 and sends it to the gas filter device through the pipeline. The particles with a diameter greater than 10 μm in the gas are filtered out when passing through the gas filter device. The particle size of the dust is usually below 75 μm, and the particle size of the ash is below 500 μm. Therefore, most of the dust and ash can be effectively filtered out.

[0034] Specifically, the gas filtering device includes the first gas filter 2 and the second gas filter 3, the first control valve 26, the third control valve 28, the tenth control valve 37 and the control valve on the backflush gas outlet of the second gas filter 3 are opened, while the second control valve 27, the fourth control valve 29, the ninth control valve 36 and the control valve on the backflush gas outlet of the first gas filter 2 are closed, at this time, the gas is filtered by the first gas filter 2 and the second gas filter 3 performs the backflush cleaning operation; after 20 minutes, the backflush self-cleaning operation of the second gas filter 3 is completed, the tenth control valve 37 and the control valve on the backflush gas outlet of the second gas filter 3 are closed; after 8 hours, the second control valve 27, the fourth control valve 29, the ninth control valve 36 and the control valve on the backflush gas outlet of the first gas filter 2 are opened, while the first control valve 26 and the third control valve 28 are closed, at this time, the gas is filtered by the second gas filter 3 and the first gas filter 2 performs the backflush cleaning operation, and the above operations are repeated to achieve uninterrupted filtering of the gas.

[0035] Then the gas is cooled for the first time by the first heat exchange unit 6, and the temperature can be reduced to 220-250 degrees, and the cooled gas enters the throttling adsorption device through the first gas flow meter 14, which is used to detect the gas flow to correctly calculate the water content of the gas, and the acidic components in the gas are removed through the throttling adsorption device.

[0036] The throttling adsorption device includes the first throttling adsorption pipe 7 and the second throttling adsorption pipe 8, the fifth control valve 31, the sixth control valve 32 and the control valve on the purge gas outlet 19 of the first throttling adsorption pipe 7 are opened, while the seventh control valve 33, the eighth control valve 34, the eleventh control valve 38, the twelfth control valve 39 and the control valve on the purge gas outlet 19 of the second throttling adsorption pipe 8 are closed, at this time, the gas enters the spiral coil 23 in the first throttling adsorption pipe 7, is cooled by the spiral coil 23 and heats the molecular sieve filler 24 in the first throttling adsorption pipe 7, so that the molecular sieve filler 24 in the first throttling adsorption pipe 7 is regenerated, then the gas enters the second throttling adsorption pipe 8, sequentially passes through the gas filtering core 20, the throttling capillary tube 21 and the molecular sieve filler in the second throttling adsorption pipe 8 to remove the acidic components in the gas, and then enters the second heat exchange unit 9 through the second gas flow meter 15, after 8 hours, the eleventh control valve 38 is opened, high-pressure air in the first high-pressure air tank 4 is used to purge the first throttling adsorption pipe 7 for 20 minutes, so that the first throttling adsorption pipe 7 is cooled and the residual acidic gas inside is discharged, realizing self-cleaning of the first throttling adsorption pipe 7. The above valve states are reversed to complete switching, i.e. the acidic components in the gas are removed by the first throttling adsorption pipe 7 and the backflush cleaning operation is performed on the second throttling adsorption pipe 8, and the above operations are repeated to achieve uninterrupted acid removal of the gas.

[0037] Then the gas is cooled again in the second heat exchange unit 9, so that the temperature of the gas is not higher than 180℃. The cooled gas enters the detection chamber 11, and the water content in the gas in the detection chamber 11 is detected on line by the resistance-capacitance type dew point meter 35. After passing through the detection chamber 11, the gas returns to the flue gas pipeline 25 to be detected.

[0038] The above detailed the structure, features and effects of the present application according to the embodiments shown in the drawings. The above description is only the preferred embodiments of the present application, but the present application is not limited to the embodiments shown in the drawings. Any changes or modifications made according to the concept of the present application, or equivalent embodiments with equivalent changes, are still within the scope of the present application.

Claims

1. A device for on-line detection of water in gas, comprising a flue gas pipeline (25) to be measured, characterized in that: The gas sampling pump (1), the gas filtering device, the first heat exchange unit (6), the first gas flow meter (14), the throttling adsorption device, the second gas flow meter (15), the second heat exchange unit (9) and the detection chamber (11) are sequentially connected through pipelines, the gas inlet end of the gas sampling pump (1) is connected with the measured flue gas pipeline (25) through a pipeline, the detection probe of the resistance-capacitance type dew point instrument (35) is arranged in the detection chamber (11), and the gas outlet end of the detection chamber (11) is connected with the measured flue gas pipeline (25) through a pipeline; The gas filtering device comprises a first gas filter (2) and a second gas filter (3), a first control valve (26) is arranged on the connecting pipeline of the gas sampling pump (1) and the first gas filter (2), a second control valve (27) is arranged on the connecting pipeline of the gas sampling pump (1) and the second gas filter (3), a third control valve (28) is arranged on the connecting pipeline of the first gas filter (2) and the first heat exchange unit (6), and a fourth control valve (29) is arranged on the connecting pipeline of the second gas filter (3) and the first heat exchange unit (6); The throttling adsorption device comprises a first throttling adsorption pipe (7) and a second throttling adsorption pipe (8), the first throttling adsorption pipe (7) and the second throttling adsorption pipe (8) are completely same in structure, both of them comprise a gas filtering core (20), a throttling capillary (21), a spiral coil (23), a molecular sieve filler (24) and a shell (30), the gas filtering core (20), the throttling capillary (21) and the molecular sieve filler (24) are sequentially arranged in the shell (30), the spiral coil (23) is arranged in the molecular sieve filler (24), the gas inlet end and the gas outlet end of the spiral coil (23) are located outside the shell (30), a purge gas inlet (18) and a purge gas outlet (19) are arranged on the shell (30), the purge gas outlet (19) is located at the same end as the gas filtering core (20), the purge gas inlet (18) is located at the same end as the molecular sieve filler (24), a throttling adsorption pipe gas inlet (16) and a throttling adsorption pipe gas outlet (17) are further arranged on the shell (30), the throttling adsorption pipe gas inlet (16) is connected with the gas filtering core (20), and the throttling adsorption pipe gas outlet (17) is located at the same end as the purge gas inlet (18); The gas inlet end of the spiral coil (23) in the first throttling adsorption pipe (7) is provided with a fifth control valve (31) on the connecting pipeline of the first gas flow meter (14), the gas outlet end of the spiral coil (23) is connected with the throttling adsorption pipe gas inlet (16) in the second throttling adsorption pipe (8) through a pipeline, the throttling adsorption pipe gas outlet (17) in the second throttling adsorption pipe (8) is provided with a sixth control valve (32) on the connecting pipeline of the second gas flow meter (15), the gas inlet end of the spiral coil (23) in the second throttling adsorption pipe (8) is provided with a seventh control valve (33) on the connecting pipeline of the first gas flow meter (14), the gas outlet end of the spiral coil (23) is connected with the throttling adsorption pipe gas inlet (16) in the first throttling adsorption pipe (7) through a pipeline, and the throttling adsorption pipe gas outlet (17) in the first throttling adsorption pipe (7) is provided with an eighth control valve (34) on the connecting pipeline of the second gas flow meter (15).

2. The online gas moisture detection device according to claim 1, characterized in that: The first gas filter (2) and the second gas filter (3) are completely same in structure, and sintered stainless steel filter elements are arranged in the first gas filter (2) and the second gas filter (3).

3. The on-line gas moisture detection device according to claim 1, characterized in that: The first heat exchange unit (6) is a spiral fin tube heat exchanger.

4. The online gas moisture detection device according to claim 1, characterized in that: The first high-pressure air tank (4) is connected with the first gas filter (2) and the first throttling adsorption pipe (7), and the second high-pressure air tank (5) is connected with the second gas filter (3) and the second throttling adsorption pipe (8).

5. The online gas moisture detection device according to claim 4, characterized in that: The second heat exchange unit (9) is a shell-and-tube heat exchanger, a temperature controller (13) is connected to the second heat exchange unit (9), and an electric heating jacket (10) is sleeved on the connecting pipeline between the second heat exchange unit (9) and the detection chamber (11); an online humidity detection sensor is arranged in the detection chamber (11), and a temperature transmitter (12) is further connected to the detection chamber (11).

6. A detection method based on the gas moisture on-line detection device according to any one of claims 1-5, characterized in that, The gas sampling pump (1) draws the gas in the measured flue gas pipeline (25) and sends the gas to the gas filtering device, the particulate matters with a diameter greater than 10 μm in the gas are filtered out when passing through the gas filtering device, then the gas passes through the first heat exchange unit (6) to be cooled for the first time, the cooled gas enters the throttling adsorption device through the first gas flow meter (14), the acidic components in the gas are removed through the throttling adsorption device, then the gas enters the second heat exchange unit (9) through the second gas flow meter (15), the gas is cooled again in the second heat exchange unit (9), the cooled gas enters the detection chamber (11), the capacitance type dew point instrument (35) detects the water content in the gas in the detection chamber (11) online, and the gas returns to the measured flue gas pipeline (25) after passing through the detection chamber (11). The gas inlet end of the spiral coil (23) in the first throttling adsorption pipe (7) is provided with a fifth control valve (31) on the connecting pipeline of the first gas flow meter (14), the gas outlet end of the spiral coil (23) is connected with the throttling adsorption pipe gas inlet (16) in the second throttling adsorption pipe (8) through a pipeline, the throttling adsorption pipe gas outlet (17) in the second throttling adsorption pipe (8) is provided with a sixth control valve (32) on the connecting pipeline of the second gas flow meter (15), the gas inlet end of the spiral coil (23) in the second throttling adsorption pipe (8) is provided with a seventh control valve (33) on the connecting pipeline of the first gas flow meter (14), the gas outlet end of the spiral coil (23) is connected with the throttling adsorption pipe gas inlet (16) in the first throttling adsorption pipe (7) through a pipeline, and the throttling adsorption pipe gas outlet (17) in the first throttling adsorption pipe (7) is provided with an eighth control valve (34) on the connecting pipeline of the second gas flow meter (15). The first gas filter (2) and the second gas filter (3) are completely same in structure, and sintered stainless steel filter elements are arranged in the first gas filter (2) and the second gas filter (3). The first heat exchange unit (6) is a spiral fin tube heat exchanger. The first high-pressure air tank (4) is connected with the first gas filter (2) and the first throttling adsorption pipe (7), and the second high-pressure air tank (5) is connected with the second gas filter (3) and the second throttling adsorption pipe (8). The second heat exchange unit (9) is a shell-and-tube heat exchanger, a temperature controller (13) is connected to the second heat exchange unit (9), and an electric heating jacket (10) is sleeved on the connecting pipeline between the second heat exchange unit (9) and the detection chamber (11); an online humidity detection sensor is arranged in the detection chamber (11), and a temperature transmitter (12) is further connected to the detection chamber (11). The gas sampling pump (1) draws the gas in the measured flue gas pipeline (25) and sends the gas to the gas filtering device, the particulate matters with a diameter greater than 10 μm in the gas are filtered out when passing through the gas filtering device, then the gas passes through the first heat exchange unit (6) to be cooled for the first time, the cooled gas enters the throttling adsorption device through the first gas flow meter (14), the acidic components in the gas are removed through the throttling adsorption device, then the gas enters the second heat exchange unit (9) through the second gas flow meter (15), the gas is cooled again in the second heat exchange unit (9), the cooled gas enters the detection chamber (11), the capacitance type dew point instrument (35) detects the water content in the gas in the detection chamber (11) online, and the gas returns to the measured flue gas pipeline (25) after passing through the detection chamber (11).

7. The method of claim 6, wherein: The gas filtering device comprises a first gas filter (2) and a second gas filter (3), when gas is filtered through the first gas filter (2), the second gas filter (3) performs a back flushing cleaning operation; when gas is filtered through the second gas filter (3), the first gas filter (2) performs a back flushing cleaning operation; the throttling adsorption device comprises a first throttling adsorption pipe (7) and a second throttling adsorption pipe (8), when gas removes acidic components through the first throttling adsorption pipe (7), the second throttling adsorption pipe (8) performs a back flushing cleaning operation; when gas removes acidic components through the second throttling adsorption pipe (8), the first throttling adsorption pipe (7) performs a back flushing cleaning operation.

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