Method and system for rapidly detecting moisture in biomass pyrolysis gas

Abstract

The invention discloses a method and a system for rapidly detecting moisture of biomass thermal cracking gas, which are characterized in that a target temperature interval of water analysis peaks of the thermal cracking gas of a biomass sample is obtained through a thermogravimetry-mass spectrometry combined device, and then the moisture generation amount of the biomass sample in the target temperature interval is obtained through a Karl Fischer method. According to the invention, not only can trace moisture of the thermal cracking gas be tested, but also the thermal cracking gas with high moisture content can be detected. The method can realize the online detection function of the water content of the segmented thermal cracking gas of the biomass sample, and has the advantages of high detection speed, high precision, low cost and simplicity in operation.

Description

Technical Field

[0001] The invention relates to a method and a system for quickly detecting moisture in biomass thermal cracking gas, belonging to the technical field of biomass new energy. Background Art

[0002] The moisture content in the gas generated by biomass pyrolysis has an important influence on gas calorific value, component distribution, gas temperature and other parameters. Therefore, it is very important to quickly and accurately detect the moisture content of the gas generated by biomass pyrolysis. At present, the method for detecting the moisture content of biomass pyrolysis gas is usually to obtain the water ion current intensity curve by thermogravimetry-mass spectrometry, and to obtain the area size by integrating the water ion current intensity curve, and to make a standard curve, and finally to obtain the water mass of the water analysis peak in the target temperature range. The above method is relatively complicated, the detection time is long, the accuracy is insufficient, the efficiency is low, and the cost is expensive. In addition, the existing technology cannot realize the online rapid detection of the moisture content of biomass pyrolysis gas in different target temperature ranges. Therefore, how to develop a rapid and accurate detection method for the moisture content of biomass pyrolysis gas is of great value to the promotion and application of biomass pyrolysis technology. Summary of the invention

[0003] The purpose of the present invention is to provide a method and system for rapid detection of moisture content in biomass pyrolysis gas, which can achieve rapid detection of moisture content in segmented pyrolysis gas of biomass samples by obtaining a target temperature range of a water analysis peak in the pyrolysis gas of a biomass sample and then obtaining the moisture generation amount of the biomass sample in the target temperature range by the Karl Fischer method.

[0004] In order to achieve the above objectives / solve the above technical problems, the present invention is implemented by adopting the following technical solutions.

[0005] In one aspect, the present invention provides a method for rapid detection of water content in biomass pyrolysis gas, comprising:

[0006] Obtaining a target temperature range of a water analysis peak of the pyrolysis gas of the biomass sample to be tested;

[0007] The Karl Fischer method was used to test the moisture content of the pyrolysis gas of the biomass sample in the target temperature range.

[0008] Furthermore, the step of obtaining the target temperature interval of the water analysis peak of the pyrolysis gas of the biomass sample to be tested specifically comprises the following steps:

[0009] Weigh a certain weight of the biomass sample to be tested;

[0010] Perform thermal cracking on the biomass sample to be tested, and set the heating rate, heating mode, maximum temperature, gas atmosphere and gas flow rate of the thermal cracking;

[0011] Real-time monitoring of the molecular fragment ion current intensity signal with a mass-to-charge ratio of 18 in the pyrolysis gas, and obtaining the water ion current intensity curve.

[0012] Several target temperature intervals are obtained according to the peak-to-valley changes of the water ion current intensity curve;

[0013] The target temperature interval is: the temperature interval corresponding to two adjacent troughs in the water ion current intensity curve.

[0014] Furthermore, the method of testing the moisture content of the pyrolysis gas of the biomass sample to be tested in the target temperature range by the Karl Fischer method specifically includes the following steps:

[0015] Weigh a certain weight of the biomass sample to be tested;

[0016] Performing thermal cracking of the biomass sample under test by increasing temperature or increasing pressure;

[0017] The difference in moisture content of the pyrolysis gas of the biomass sample to be tested under the temperature conditions of the end values ​​of the corresponding target temperature interval is taken as the moisture content of the pyrolysis gas in the corresponding target temperature interval.

[0018] Furthermore, when the moisture content of the biomass sample to be tested is less than 1 mg, a coulometric Karl Fischer instrument is used to test the moisture content of the pyrolysis gas of the biomass sample to be tested;

[0019] When the moisture content of the biomass sample to be tested is higher than 1 mg, a volumetric Karl Fischer instrument is used to test the moisture content of the pyrolysis gas of the biomass sample to be tested;

[0020] The moisture content of the biomass sample to be tested can be measured by an oven method, and the temperature of the oven method is 100°C.

[0021] Furthermore, if the physical structure and chemical composition of the sample need to be changed, the biomass sample to be tested needs to be pretreated to eliminate interfering factors;

[0022] The pretreatment adopts one or more combinations of crushing and screening treatment, drying treatment, puffing treatment, catalytic treatment, acid washing treatment, alkali washing treatment and water washing treatment.

[0023] In a second aspect, the present invention provides a rapid detection system for water content in biomass pyrolysis gas, comprising: a first gas bottle, a second gas bottle, a heating furnace, a reactor, a four-way valve, a volumetric Karl Fischer instrument, a coulometric Karl Fischer instrument and a thermogravimetric-mass spectrometry device;

[0024] The first gas bottle is connected to the inlet of the heating furnace through a pipeline, and the outlet of the heating furnace is connected to the first inlet of the four-way valve through a first insulation pipeline;

[0025] The second gas bottle is connected to the reactor inlet through a pipeline, and the reactor outlet is connected to the second inlet of the four-way valve through a second insulation pipeline;

[0026] The first outlet of the four-way valve is connected to a volumetric Karl Fischer instrument;

[0027] The second outlet of the four-way valve is connected to a coulometric Karl Fischer instrument.

[0028] The thermogravimetric-mass spectrometry device is used to obtain the target temperature range of the water analysis peak of the pyrolysis gas of the biomass sample to be tested, heat it through a heating furnace or a reactor, and then test the water content of the pyrolysis gas of the biomass sample to be tested in the target temperature range through a Karl Fischer test device.

[0029] Furthermore, the heating furnace includes: a temperature controller, a data recorder, a heating element, a heating tube and a weighing device;

[0030] The heating tube is wrapped and connected by the heating element, and the weighing device is connected inside the heating tube to weigh the mass of the biomass sample to be tested;

[0031] The heating element is connected to the temperature controller, and the data recorder is connected to the temperature controller and the weighing device respectively; the temperature controller is used to control the temperature of the heating element, and the data recorder is used to record the real-time changes of the heating temperature and the sample mass;

[0032] The air inlet end of the heating tube is connected to the first gas bottle, and the air outlet end of the heating tube is connected to the first inlet of the four-way valve through the first insulation pipe; a first flow meter is arranged on the connecting pipeline between the heating tube and the first gas bottle.

[0033] Furthermore, the reactor comprises: a high temperature and high pressure reaction vessel, a pressure relief valve and a control module;

[0034] The gas inlet end of the high-temperature and high-pressure reaction container is connected to the second gas bottle, and the gas outlet end of the high-temperature and high-pressure reaction container is connected to the second inlet of the four-way valve through the second insulation pipeline; the pressure relief valve is used to adjust the pressure of the high-temperature and high-pressure reaction container, and the control module is used to adjust the heating temperature of the high-temperature and high-pressure reaction container;

[0035] A second flow meter is arranged on the connecting pipeline between the high-temperature and high-pressure reaction container and the second gas bottle.

[0036] Furthermore, the pipe temperature range of the first insulated pipe and the second insulated pipe is 120-150°C.

[0037] Furthermore, the gas types in the first gas cylinder and the second gas cylinder include: one or more combinations of nitrogen, helium, air, oxygen, and hydrogen.

[0038] Compared with the prior art, the present invention has the following beneficial effects: the present invention obtains the target temperature range of the water analysis peak of the pyrolysis gas of the biomass sample through a thermogravimetry-mass spectrometry experiment, and then obtains the moisture content of the biomass pyrolysis gas in the target temperature range through segmented heating and the Karl Fischer method; and can also obtain the moisture content of the pyrolysis gas generated by the biomass under high temperature and high pressure conditions by setting high temperature and high pressure parameters and using the Karl Fischer method.

[0039] The present invention can not only detect trace amounts of moisture in pyrolysis gas, but also detect pyrolysis gas with high moisture content.

[0040] The present invention can monitor the change of the residual mass percentage during the thermal cracking process of the biomass sample in real time.

[0041] The present invention can realize the online detection function of the moisture content of the segmented pyrolysis gas of the biomass sample in the target temperature range, and has the advantages of fast detection speed, high accuracy, low cost and simple operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a flow chart of the method for rapid detection of moisture in biomass pyrolysis gas of the present invention;

[0043] Figure 2 Schematic diagram of the rapid detection system of water content in biomass pyrolysis gas according to the present invention;

[0044] Figure 3 The experimental results of the water ion current intensity curve and the target temperature range of the pyrolysis gas of the biomass sample of the present invention;

[0045] Figure 4 The test results of the moisture content of the segmented pyrolysis gas of the biomass sample in the target temperature range of the present invention;

[0046] Figure 5 is the test result of the mass percentage of the biomass sample of the present invention;

[0047] Explanation of the reference numerals: first gas cylinder 1, first flow meter 2, temperature controller 3, data recorder 4, heating element 5, heating tube 6, weighing machine 7, heating furnace 8, first insulation pipe 9, four-way valve 10, second insulation pipe 11, volumetric Karl Fischer instrument 12, coulometric Karl Fischer instrument 13, high temperature and high pressure reaction vessel 14, pressure relief valve 15, control module 16, reactor 17, second flow meter 18, second gas cylinder 19, thermogravimetry-mass spectrometry device 20. DETAILED DESCRIPTION

[0048] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solution of the present invention, rather than limitations on the technical solution of the present invention. The embodiments of the present invention and the technical features in the embodiments may be combined with each other unless there is a conflict.

[0049] The term "and / or" is only a description of the association relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " generally indicates that the related objects are in an "or" relationship.

[0050] Embodiment 1:

[0051] like Figure 1 As shown, this embodiment provides a method for rapid detection of moisture in biomass pyrolysis gas, comprising:

[0052] Obtaining a target temperature range of a water analysis peak of the pyrolysis gas of the biomass sample to be tested: weighing a certain weight of the biomass sample to be tested;

[0053] Perform thermal cracking on the biomass sample to be tested, and set the heating rate, maximum temperature, gas atmosphere and gas flow rate of the thermal cracking;

[0054] Real-time monitoring of the molecular fragment ion current intensity signal with a mass-to-charge ratio of 18 in the pyrolysis gas, and obtaining the water ion current intensity curve.

[0055] Several target temperature intervals are obtained according to the peak-to-valley changes of the water ion current intensity curve;

[0056] The Karl Fischer method is used to test the moisture content of the pyrolysis gas of the biomass sample in the target temperature range;

[0057] Weigh a certain weight of the biomass sample to be tested;

[0058] Performing temperature-raising pyrolysis or pressure-raising pyrolysis on the biomass sample to be tested, including: setting the heating rate, maximum temperature, gas atmosphere, and gas flow rate of the temperature-raising pyrolysis; setting the pressure parameters, heating rate, maximum temperature, heating mode, and gas atmosphere of the pressure-raising pyrolysis;

[0059] The difference in moisture content of the pyrolysis gas of the biomass sample to be tested under the temperature conditions of the end values ​​of the corresponding target temperature interval is used as the moisture content of the pyrolysis gas in the corresponding target temperature interval;

[0060] The moisture content of the biomass sample to be tested was measured by an oven method, and the temperature of the oven method was 100°C.

[0061] When the moisture content of the biomass sample to be tested is less than 1 mg, a coulometric Karl Fischer instrument is used to test the moisture content of the pyrolysis gas of the biomass sample to be tested;

[0062] When the moisture content of the biomass sample to be tested is higher than 1 mg, a volumetric Karl Fischer instrument is used to test the moisture content of the thermal cracking gas of the biomass sample to be tested.

[0063] If the physical structure and chemical composition of the sample need to be changed, the biomass sample to be tested needs to be pretreated to eliminate interfering factors;

[0064] The pretreatment adopts one or more combinations of crushing and screening treatment, drying treatment, puffing treatment, catalytic treatment, acid washing treatment, alkali washing treatment and water washing treatment.

[0065] Embodiment 2:

[0066] like Figure 2 As shown, this embodiment provides a rapid detection system for moisture in biomass pyrolysis gas, comprising:

[0067] A first gas cylinder 1, a second gas cylinder 19, a heating furnace 8, a reaction kettle 17, a four-way valve 10, a volumetric Karl Fischer instrument 12, a coulometric Karl Fischer instrument 13 and a thermogravimetric-mass spectrometry device 20;

[0068] The heating furnace 8 includes: a temperature controller 3, a data recorder 4, a heating element 5, a heating tube 6 and a weighing device 7;

[0069] The heating tube 6 is wrapped and connected with the heating element 5, and the weighing device 7 is connected inside the heating tube 6;

[0070] The heating element 5 is connected to the temperature controller 3, and the data recorder 4 is connected to the temperature controller 3 and the weighing device 7 respectively; the temperature controller 3 is used to control the temperature of the heating element 5, and the data recorder 4 is used to record the real-time changes of the heating temperature and the sample mass;

[0071] The air inlet end of the heating tube 6 is connected to the first gas bottle 1, and the air outlet end of the heating tube 6 is connected to the first inlet of the four-way valve 10 through the first insulation pipe 9. The pipe temperature range of the first insulation pipe 9 is 120-150° C., which effectively avoids the condensation and liquefaction of the water in the biomass pyrolysis gas during the pipeline transportation process; a first flow meter 2 is arranged on the connecting pipe between the heating tube 6 and the first gas bottle 1;

[0072] The heating temperature range of the heating furnace 8 is 30~1000℃, the heating rate range is 5~80℃ / min, the pressure is normal pressure, and the weighing device 7 tests the mass change of the biomass sample in the thermal cracking process in real time.

[0073] The reactor 17 includes: a high temperature and high pressure reaction vessel 14, a pressure relief valve 15 and a control module 16;

[0074] The gas inlet end of the high-temperature and high-pressure reaction vessel 14 is connected to the second gas bottle 19, and the gas outlet end of the high-temperature and high-pressure reaction vessel 14 is connected to the second inlet of the four-way valve 10 through the second insulation pipe 11. The pipe temperature range of the second insulation pipe 11 is 120-150°C, which effectively avoids the condensation and liquefaction of the water content of the biomass thermal cracking gas during the pipeline transportation process; the pressure relief valve 15 is used to adjust the pressure of the high-temperature and high-pressure reaction vessel 14, and the control module 16 is used to adjust the heating temperature of the high-temperature and high-pressure reaction vessel 14;

[0075] A second flow meter 18 is provided on the connecting pipeline between the high temperature and high pressure reaction vessel 14 and the second gas bottle 19;

[0076] The heating temperature range of the reactor 17 is 30-1000°C, the heating rate range is 5-300°C / min, and the pressure parameter range is 0.1-10MPa;

[0077] The thermogravimetric-mass spectrometry device 20 is used to obtain the target temperature range of the water analysis peak of the pyrolysis gas of the biomass sample to be tested, and to perform segmented detection of the water content of the pyrolysis gas;

[0078] The first outlet of the four-way valve 10 is connected to a volumetric Karl Fischer instrument 12;

[0079] The second outlet of the four-way valve 10 is connected to a coulometric Karl Fischer instrument 13;

[0080] The titrant of the Karl Fischer reagent of the volumetric Karl Fischer instrument 12 and the coulometric Karl Fischer instrument 13 contains sulfur dioxide, imidazole and iodine, and the solvent is methanol or ethanol. Other solvents such as chloroform, octanol, hexahydric alcohol or ethylene glycol may also be added according to actual application requirements.

[0081] The gas types of the first gas cylinder 1 and the second gas cylinder 19 include: one or more combinations of nitrogen, helium, air, oxygen, and hydrogen.

[0082] Embodiment 3:

[0083] like Figure 1 to Figure 2 As shown: This embodiment provides a specific operation process of a method for rapid detection of moisture in biomass pyrolysis gas, including: a first process and a second process, wherein the biomass sample to be detected is tobacco raw material;

[0084] The first process includes the following steps:

[0085] Step 1: Weigh 5 mg of biomass sample using a balance;

[0086] Step 2: Pre-process the biomass sample by crushing and screening to improve the uniformity of the biomass sample;

[0087] Step 3, placing the biomass sample into a thermogravimetric-mass spectrometry device 20, setting the heating rate to 20°C / min, the maximum temperature to 280°C, the heating mode to constant heating rate, the gas atmosphere to nitrogen, and the gas flow rate to 50 mL / min;

[0088] Step 4, performing thermal cracking on the biomass sample to be tested by using a thermogravimetric-mass spectrometry device 20, monitoring the ion flow intensity signal of molecular fragments with a mass-to-charge ratio of 18 in the thermal cracking gas in real time, and making a water ion flow intensity curve;

[0089] Step 5, obtaining several target temperature intervals according to the peak-to-valley changes of the water ion current intensity curve, wherein the target temperature interval is the temperature interval corresponding to the water analysis peak, that is, the temperature interval corresponding to two adjacent troughs in the water ion current intensity curve; Figure 3 As shown, the experimental results of the water ion current intensity curve of the pyrolysis gas of the biomass sample and the target temperature range are obtained, thereby obtaining the target temperature range of the water analysis peak of the pyrolysis gas of the biomass sample of 40~150℃ (the first water analysis peak) and 150~247℃ (the second water analysis peak).

[0090] The second process includes the following steps:

[0091] Step 1: Weigh a biomass sample of M = 5 mg using a balance;

[0092] Step 2: Pre-process the biomass sample by crushing and screening to improve the uniformity of the biomass sample;

[0093] Step 3: putting the biomass sample into the heating furnace 8; setting the parameters of the heating furnace 8 include: the heating rate is 20°C / min, the heating temperatures are 40°C, 150°C, and 247°C respectively, the gas atmosphere is dry air, and the gas flow rate is 50mL / min;

[0094] Step 4, measuring the moisture content of the biomass sample to be tested by an oven method to be less than 1 mg, the temperature of the oven method is 100° C.; using a coulometric Karl Fischer instrument to test the moisture content of the thermal cracking gas of the biomass sample to be tested;

[0095] Step 5, using a coulometric Karl Fischer instrument to test the moisture content of the thermal cracking gas of the biomass sample at 40°C, W1=0 mg, the moisture content of the gas of the biomass sample at 150°C, W2=0.609 mg, and the moisture content of the gas of the biomass sample at 247°C, W3=0.935 mg;

[0096] Step 6, such as Figure 4As shown, the water content of the gas per unit mass of 1g biomass sample in the target temperature range (40~150℃, the first water analysis peak) is W4=(W2-W1) / M×1000=121.8mg / g.

[0097] The moisture content of the gas per unit mass of 1g biomass sample in the target temperature range (150~247℃, the second water analysis peak) is W5=(W3-W2) / M×1000=65.2mg / g.

[0098] Embodiment 4:

[0099] In addition to the technical solution of Example 3, the "heating furnace 8" into which the biomass sample is placed is replaced by the "reactor 17", and the parameters of the reactor 17 are set as follows: pressure parameter 2MPa, heating rate 20°C / min, heating temperatures of 40°C, 150°C, and 247°C, respectively, heating mode of constant heating rate, and nitrogen gas atmosphere; thereby measuring the moisture content of the pyrolysis gas of the biomass sample and obtaining the moisture content of the pyrolysis gas generated under high temperature and high pressure conditions.

[0100] Embodiment 5:

[0101] In addition to the technical solution of Example 3, when the moisture content of the biomass sample to be tested is higher than 1 mg, the "coulometric Karl Fischer instrument 13" to which the pyrolysis gas generated by the biomass sample is transported through an insulated pipe is replaced with a "volumetric Karl Fischer instrument 12" to measure the moisture content of the pyrolysis gas of the biomass sample, thereby ensuring that the measurement result is more accurate.

[0102] The present invention obtains the target temperature range of the water analysis peak of the pyrolysis gas of the biomass sample through a thermogravimetry-mass spectrometry experiment; sets the heating temperature in sections by a heating furnace, and obtains the moisture content of the biomass pyrolysis gas in the target temperature range by the Karl Fischer method; sets high temperature and high pressure parameters by a reactor, and obtains the moisture content of the pyrolysis gas generated by the biomass under high temperature and high pressure conditions by the Karl Fischer method. In addition, the method of the present invention can not only detect trace amounts of moisture in the pyrolysis gas, but also detect pyrolysis gas with high moisture content. The present invention can realize the online detection function of the moisture content of the segmented pyrolysis gas of the biomass sample in the target temperature range, and has the advantages of fast detection speed, high accuracy, low cost, and simple operation;

[0103] like Figure 5 As shown, the present invention can also obtain the test results of the mass percentage of the biomass sample during the detection process, and monitor the change of the remaining mass during the thermal cracking process of the biomass sample in real time.

[0104] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the protection of the present invention.

Claims

1. A method for rapid detection of water content in biomass pyrolysis gas, characterized in that: include: Obtaining a target temperature range of a water analysis peak of the pyrolysis gas of the biomass sample to be tested; The Karl Fischer method is used to test the moisture content of the pyrolysis gas of the biomass sample in the target temperature range; The method of obtaining the target temperature interval of the water analysis peak of the pyrolysis gas of the biomass sample to be tested specifically comprises the following steps: Weigh a certain weight of the biomass sample to be tested; The biomass sample to be tested is subjected to thermal cracking at elevated temperature, and the ion flow intensity signal of molecular fragments with a mass-to-charge ratio of 18 in the thermal cracking gas is monitored in real time to obtain the water ion flow intensity curve. Several target temperature intervals are obtained according to the peak-to-valley changes of the water ion current intensity curve; The target temperature interval is: the temperature interval corresponding to two adjacent troughs in the water ion current intensity curve.

2. The method for rapid detection of moisture in biomass pyrolysis gas according to claim 1, characterized in that: The method of testing the moisture content of the pyrolysis gas of the biomass sample to be tested in the target temperature range by the Karl Fischer method specifically comprises the following steps: Weigh a certain weight of the biomass sample to be tested; Performing thermal cracking of the biomass sample under test by increasing temperature or increasing pressure; The difference in moisture content of the pyrolysis gas of the biomass sample to be tested under the temperature conditions of the end values ​​of the corresponding target temperature interval is taken as the moisture content of the pyrolysis gas in the corresponding target temperature interval.

3. The method for rapid detection of moisture in biomass pyrolysis gas according to claim 2, characterized in that: When the moisture content of the biomass sample to be tested is less than 1 mg, a coulometric Karl Fischer instrument is used to test the moisture content of the pyrolysis gas of the biomass sample to be tested; When the moisture content of the biomass sample to be tested is higher than 1 mg, a volumetric Karl Fischer instrument is used to test the moisture content of the thermal cracking gas of the biomass sample to be tested.

4. The method for rapid detection of moisture in biomass pyrolysis gas according to claim 1 or 2, characterized in that: If the physical structure or chemical composition of the biomass sample to be tested needs to be changed, the weighed biomass sample to be tested needs to be pretreated; The pretreatment adopts one or more combinations of crushing and screening treatment, drying treatment, puffing treatment, catalytic treatment, acid washing treatment, alkali washing treatment and water washing treatment.

5. A rapid detection system for moisture in biomass pyrolysis gas, characterized in that: include: A first gas cylinder (1), a second gas cylinder (19), a heating furnace (8), a reaction kettle (17), a four-way valve (10), a volumetric Karl Fischer instrument (12), a coulometric Karl Fischer instrument (13), and a thermogravimetric-mass spectrometry device (20); The first gas bottle (1) is connected to the inlet of the heating furnace (8) through a pipeline, and the outlet of the heating furnace (8) is connected to the first inlet of the four-way valve (10) through a first insulation pipeline (9); The second gas bottle (19) is connected to the inlet of the reaction kettle (17) through a pipeline, and the outlet of the reaction kettle (17) is connected to the second inlet of the four-way valve (10) through a second insulation pipeline (11); The first outlet of the four-way valve (10) is connected to a volumetric Karl Fischer instrument (12); The second outlet of the four-way valve (10) is connected to a coulometric Karl Fischer instrument (13); The thermogravimetric-mass spectrometry device (20) is used to obtain a target temperature range of a water analysis peak of a pyrolysis gas of a biomass sample to be tested.

6. The biomass pyrolysis gas moisture rapid detection system according to claim 5, characterized in that: The heating furnace (8) comprises: a temperature controller (3), a data recorder (4), a heating element (5), a heating tube (6) and a weighing device (7); The heating tube (6) is wrapped and connected to the heating element (5), and the weighing device (7) is connected inside the heating tube (6); The heating element (5) is connected to the temperature controller (3), and the data recorder (4) is connected to the temperature controller (3) and the weighing device (7) respectively; the temperature controller (3) is used to control the temperature of the heating element (5), and the data recorder (4) is used to record the real-time changes of the heating temperature and the mass of the sample; The air inlet end of the heating tube (6) is connected to the first gas bottle (1), and the air outlet end of the heating tube (6) is connected to the first inlet of the four-way valve (10) via a first heat-insulating pipe (9); a first flow meter (2) is provided on the connecting pipe between the heating tube (6) and the first gas bottle (1).

7. The biomass pyrolysis gas moisture rapid detection system according to claim 5, characterized in that: The reactor (17) comprises: a high-temperature and high-pressure reaction container (14), a pressure relief valve (15) and a control module (16); The gas inlet end of the high-temperature and high-pressure reaction container (14) is connected to the second gas bottle (19), and the gas outlet end of the high-temperature and high-pressure reaction container (14) is connected to the second inlet of the four-way valve (10) through the second heat-insulating pipe (11); the pressure relief valve (15) is used to control the pressure of the high-temperature and high-pressure reaction container (14), and the control module (16) is used to control the heating temperature of the high-temperature and high-pressure reaction container (14); and a second flow meter (18) is provided on the connecting pipeline between the high-temperature and high-pressure reaction container (14) and the second gas bottle (19).

8. The biomass pyrolysis gas moisture rapid detection system according to claim 6 or 7, characterized in that: The pipe temperature range of the first thermal insulation pipe (9) and the second thermal insulation pipe (11) is 120-150°C.

9. The biomass pyrolysis gas moisture rapid detection system according to claim 5, characterized in that: The types of gas in the first gas cylinder (1) and the second gas cylinder (19) include: one or more combinations of nitrogen, helium, air, oxygen, and hydrogen.

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