A vacuum degassing system and method for volatile matter in coal mixed pyrolysis raw materials

Abstract

The present invention discloses a vacuum degassing system and method for volatiles in coal mixed pyrolysis raw materials. The mixed pyrolysis reaction system and the vacuum pumping system provide different reaction environments for volatile extraction, thereby avoiding gas loss caused by high-temperature one-step pyrolysis reaction to determine volatiles, which is beneficial to some coal samples with high coalbed methane content or low-rank coal with high volatile content; the mixed raw material processing system cooperates with the reaction steps to realize the weighing, recovery and crushing processes of the mixed raw materials; the vacuum pumping system ensures that the gas collected by the volatile gas collection system is not interfered by air, thereby improving the accuracy of the system; the present invention can be used to predict and guide the types, proportions and blending of coal mixed pyrolysis raw materials, optimize the composition of coal mixed pyrolysis raw materials, reduce the heat loss of combustion raw materials, reduce costs, achieve the purpose of economy and environmental protection, and has important guiding significance for coal mixed pyrolysis.

Description

Technical Field

[0001] The present invention relates to the technical field of clean thermal utilization of coal, and particularly to a vacuum degassing system and method for volatile components in a coal mixed pyrolysis raw material. Background Art

[0002] The over-exploitation of fossil resources has caused problems such as resource shortage, air pollution, and greenhouse effect. The mixed pyrolysis technology of fossil fuels is one of the effective ways to solve this problem. By using the mixed pyrolysis and coupling technology of coal and low-quality fossil fuels, the hierarchical conversion and utilization of the energy structure system can be changed, and the comprehensive thermal utilization of fossil energy can be realized.

[0003] The mixed pyrolysis process is a complex chemical reaction process, including the cracking of oxygen-containing functional groups, the decomposition of aliphatic side chains, the condensation of aromatic structures, the cross-linking between structures, and the migration of catalytic media. Among them, the desorption process of volatile components, the pyrolysis process of semi-coke, and the gas-phase reaction process of volatile components all occur simultaneously in a complex multiphase environment.

[0004] Volatile matter is one of the important characteristics of the degree of coalification of coal and an important index to measure the quality of coal combustion raw materials. The higher the volatile matter content, the better its combustion degree. It usually refers to the volatile components contained in coal samples collected from geological surveys, such as water, carbon dioxide, and volatile substances such as sulfur, chlorine, and fluorine. Factors affecting volatile matter include heating time and heating temperature. The existing method for measuring volatile matter is to heat a coal sample in a vacuum environment for 7 minutes (at a temperature of about 900 °C), and then collect the pyrolyzed liquid and gas (mainly minerals and organic matter), and calculate the content of volatile matter in the coal sample.

[0005] However, the problem is that due to the different compositions of volatile matter in the mixed pyrolysis raw materials, the gas production and composition of the mixed pyrolysis have changed, and the volatile matter desorption properties of different fuels are different. Using the traditional high-temperature one-step pyrolysis reaction to measure the volatile matter in the mixed pyrolysis will cause different degrees of loss of volatile matter. For example, for some coal samples with high coalbed methane content and low-rank coal with high volatile matter content, the results will deviate from the actual situation, and it is obviously not applicable. Summary of the Invention

[0006] Aiming at the problem in the existing technology that using the traditional high-temperature one-step pyrolysis reaction to measure the volatile matter in the mixed pyrolysis will cause different degrees of loss of volatile matter, the present invention provides a vacuum degassing system and method for volatile components in a coal mixed pyrolysis raw material.

[0007] The present invention is realized through the following technical solutions:

[0008] A vacuum degassing system for volatile components in a coal mixed pyrolysis raw material, characterized in that it includes a mixed raw material treatment system, a vacuum pumping system, a mixed pyrolysis reaction system, and a volatile gas collection system;

[0009] The mixed pyrolysis reaction system includes a pyrolysis tank;

[0010] The mixed raw material processing system includes a feed valve and a weighing instrument sequentially arranged on the feed pipeline;

[0011] The feed inlet of the pyrolysis tank is connected to the discharge outlet of the weighing instrument, and the discharge outlet of the pyrolysis tank is connected to the feed inlet of the feed valve;

[0012] The vacuum pumping system is hermetically connected to the feed inlet of the feed valve and the pyrolysis tank respectively, and the inlet of the volatile separation and gas collection system is connected to the volatile outlet at the top of the pyrolysis tank.

[0013] Furthermore, the mixed raw material processing system further includes a ball mill, a hopper and a discharge valve sequentially and hermetically connected. The discharge outlet of the feed valve is connected to the ball mill, and the discharge valve is hermetically connected to the feed inlet of the weighing instrument.

[0014] Furthermore, the vacuum pumping system includes a vacuum pump. The vacuum pump is connected to the pyrolysis tank through a pyrolysis tank vacuum valve; the vacuum pump is connected to the feed inlet of the feed valve through a raw material processing system vacuum valve for evacuating the mixed raw material processing system.

[0015] Furthermore, the volatile separation and gas collection system includes a gas collection bottle connected to the volatile outlet of the pyrolysis tank through a gas collection pipeline, and a flow meter is arranged on the gas collection pipeline.

[0016] Furthermore, the volatile separation and gas collection system further includes a condenser connected in parallel on the gas collection pipeline; the inlet of the condenser is connected to the gas collection pipeline behind the flow meter, and the outlet is connected to the inlet of the gas collection bottle.

[0017] Furthermore, a condenser inlet valve is arranged at the inlet of the condenser, and a condenser outlet valve is arranged at the outlet.

[0018] Furthermore, the outlet of the gas collection bottle is connected to an analysis unit for analyzing volatile components.

[0019] Furthermore, a sample feeding and analysis valve is arranged at the inlet of the analysis unit.

[0020] A method for vacuum degassing volatile components in a coal mixed pyrolysis raw material includes the following steps:

[0021] Step 1, the vacuum pumping system evacuates the pyrolysis tank to a vacuum state. The mixed raw material enters the pyrolysis tank through the weighing instrument, and the volatile component gas is removed at room temperature and enters the volatile separation and gas collection system, completing the collection process of volatile components in the mixed raw material at room temperature before pulverization;

[0022] Step 2: Heat the pyrolysis tank to 100°C, release the volatile gases from the mixed raw materials that have released volatile gases at room temperature, and send them to the volatile gas collection system to complete the process of collecting volatile gases from the mixed raw materials under low-temperature heating before pulverization;

[0023] Step 3: Discharge the mixed raw materials that have released volatile gases under low-temperature heating to the mixed raw material treatment system through the feed valve, pulverize them under vacuum conditions and discharge them into the pyrolysis tank, release volatile gases to the volatile gas collection system under the condition of heating at 100°C, and complete the process of collecting volatile gases from the mixed raw materials at low temperature after pulverization;

[0024] Step 4: Heat the pyrolysis tank to 900°C, heat the mixed raw materials that have released volatile gases at low temperature after pulverization, and release the volatile gases to the volatile gas collection system to complete the process of collecting volatile gases from the mixed raw materials at high temperature after pulverization;

[0025] Step 5: Calculate and analyze the total amount and composition structure of the volatile components released in the four vacuum degassing steps in Steps 1 to 4 to obtain the total amount and composition structure of the volatile components in the coal mixed raw materials.

[0026] Furthermore, Steps 1 to 4 are each repeated multiple times separately, with an interval of 15 - 20 minutes each time, and the next step is executed until the flow rate of the volatile gases is lower than 10 ml.

[0027] Compared with the prior art, the present invention has the following beneficial technical effects:

[0028] The vacuum degassing system for volatile components in a coal mixed pyrolysis raw material of the present invention provides different reaction environments for volatile extraction by the mixed pyrolysis reaction system and the vacuum pumping system, thereby avoiding gas loss caused by high-temperature one-step pyrolysis reaction for measuring volatile components, which is beneficial for coal samples with high coalbed methane content or low-rank coal with high volatile content; the mixed raw material treatment system cooperates with the reaction steps to realize the weighing, recovery, and pulverization processes of the mixed raw materials; the vacuum pumping system ensures that the gases collected by the volatile gas collection system are not interfered by air, thereby improving the accuracy of the system; the present invention can be used to predict and guide the types, ratios, and co-combustion of coal mixed pyrolysis raw materials, optimize the composition of coal mixed pyrolysis raw materials, reduce the heat loss of combustion raw materials, lower costs, and achieve the purpose of economic and environmental protection, which has important guiding significance for coal mixed pyrolysis.

[0029] Furthermore, the volatile gas collection system includes a flow meter to monitor the collected volatile components, and at the same time, the collection degree of the volatile components in the mixed raw materials can be determined according to the size of the flowing air.

[0030] A method for vacuum degassing volatile components in a coal mixed pyrolysis raw material, which separately collects volatile substances of the mixed raw material at room temperature and low temperature, then crushes the mixed raw material, and separately conducts low-temperature heating and high-temperature heating to collect volatile components, that is, separately collects volatile components of the mixed raw material in different states, and measures after summarization, so that the collected data is more accurate and complete.

[0031] Further, in the steps of separate collection, the operations are repeated separately for multiple times, and the interval between each time is 15 - 20 minutes until the amount of volatile gas is less than 10 ml, and as much volatile components in the mixed raw material as possible are collected, thereby ensuring the accuracy of the data. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic diagram of a vacuum degassing system for volatile components in a coal mixed pyrolysis raw material of the present invention;

[0033] Figure 2 is a schematic diagram of a vacuum degassing system for volatile components in a coal mixed pyrolysis raw material before crushing of the present invention;

[0034] Figure 3 is a schematic diagram of a vacuum degassing system for volatile components in a coal mixed pyrolysis raw material with low-temperature heating before crushing of the present invention;

[0035] Figure 4 is a schematic diagram of a vacuum degassing system for volatile components with low temperature and high temperature after crushing in a coal mixed pyrolysis raw material of the present invention.

[0036] In the figure: mixed raw material 1, feed valve 2, ball mill 3, hopper 4, discharge valve 5, weighing instrument 6, heating device 7, vacuum valve of pyrolysis tank 8, vacuum valve of raw material treatment system 9, vacuum pump 10, pyrolysis tank 11, sampling valve 12, flowmeter 13, condenser inlet valve 14, gas collecting bottle inlet valve 15, condenser 16, condenser outlet valve 17, gas collecting bottle 18, sample sending and analysis valve 19, analysis unit 20, mixed raw material treatment system 21, vacuum pumping system 22, mixed pyrolysis reaction system 23, volatile gas collecting system 24. DETAILED DESCRIPTION OF THE INVENTION

[0037] The following further elaborates the present invention in detail with specific embodiments, which is an explanation rather than a limitation of the present invention.

[0038] A vacuum degassing system for volatile components in a coal mixed pyrolysis raw material of the present invention, as Figure 1 shown, includes a mixed raw material treatment system 21, a vacuum pumping system 22, a mixed pyrolysis reaction system 23, and a volatile gas collecting system 24;

[0039] The hybrid pyrolysis reaction system 23 includes a pyrolysis tank 11. Specifically, a heating device 7 provides heat for the pyrolysis tank 11; the hybrid raw material processing system 21 includes a feed valve 2 and a weighing instrument 6 that are sequentially arranged on the feed pipeline;

[0040] Among them, the feed inlet of the pyrolysis tank 11 is connected to the discharge outlet of the weighing instrument 6. As Figure 2 shown, it is convenient for this system to collect the volatile substances in the hybrid raw material 1 before pulverization. At the same time, the discharge outlet of the pyrolysis tank 11 is connected to the feed inlet of the feed valve 2 on the feed pipeline, forming a loop that allows the uncrushed hybrid raw material 1 to enter the hybrid raw material processing system 21 from the pyrolysis tank 11 for pulverization. It is possible to collect the volatile components before and after the pulverization of the hybrid raw material 1. Specifically, to ensure the accuracy of volatile component collection, the above connections are all sealed connections.

[0041] The vacuum pumping system 22 is hermetically connected to the side wall of the pyrolysis tank 11. At the same time, the vacuum pumping system 22 is also hermetically connected to the feed valve 2 on the feed pipeline of the hybrid raw material processing system 21. Before and after the pyrolysis reaction, the inside of the pyrolysis tank 11 is evacuated to ensure that the collected gas is not affected by air and improve the accuracy of the collected data. The inlet of the volatile gas collection system 24 is connected to the volatile component outlet at the top of the pyrolysis tank 11 for collecting, storing, and analyzing the volatile gas.

[0042] The present invention provides a preferred embodiment. The hybrid raw material processing system 21 includes a ball mill 3, a hopper 4, and a discharge valve 5 that are sequentially hermetically connected. The discharge outlet of the feed valve 2 on the feed pipeline is connected to the ball mill 3, and the discharge valve 5 is connected to the feed inlet of the weighing instrument 6; specifically, the hybrid raw material 1 enters the ball mill 3 through the feed pipeline and is pulverized to an appropriate particle size, stored inside the hopper 4, and the weighing instrument 6 measures and weighs and feeds back the record. The feed of the discharge valve 5 is adjusted according to the mass feedback. Finally, the hybrid raw material 1 enters the pyrolysis tank 11. In this process, to avoid the loss of volatile components, this step is carried out under vacuum and airtight conditions; specifically, a raw material processing system vacuum valve 9 is provided at the port of the vacuum pump 10 of the vacuum pumping system 22 and is connected to the feed valve 2 on the feed pipeline, which can evacuate the hybrid raw material processing system 21 and prevent air from entering the volatile gas collection system 24 during the pulverization of the hybrid raw material 1, affecting the accuracy of the measured volatile component data.

[0043] The present invention provides a preferred embodiment. The vacuum pumping system 22 includes a vacuum pump 10. The vacuum pump 10 is connected to the gas outlet of the pyrolysis tank 11 through a pyrolysis tank vacuum valve 8 to evacuate the inside of the pyrolysis tank 11; the vacuum pump 10 is connected to the feed valve 2 through a raw material processing system vacuum valve 9 to evacuate the hybrid raw material processing system 21.

[0044] The present invention provides a preferred embodiment. The volatile gas collection system 24 includes a gas collection bottle 18. The gas collection bottle 18 is connected to the volatile gas outlet of the pyrolysis tank 11 through a flow meter 13 on the gas collection pipeline. Specifically, the flow meter 13 is used to monitor the total amount of volatile gas passing through the gas collection pipeline. Researchers can monitor the pyrolysis process reaction of the mixed raw material 1 according to the volatile gas flow rate. A gas collection bottle inlet valve 15 is provided at the gas inlet of the gas collection bottle 18. At the same time, a condenser 16 is connected in parallel to the gas collection pipeline behind the flow meter 13 to cool the sucked volatile gas. The gas outlet of the condenser 16 is connected to the gas inlet of the gas collection bottle 18, and then it is discharged into the gas collection bottle 18 for analysis. Specifically, a condenser inlet valve 14 is provided at the gas inlet of the condenser 16, and a condenser outlet valve 17 is provided at the gas outlet. This is because, during the use of this system, some of the volatile gas generated in the steps does not need to be cooled and can enter the gas collection bottle 18 for storage.

[0045] The present invention provides a preferred embodiment. The gas outlet of the gas collection bottle 18 is connected to an analysis unit 20 for analyzing volatile components, and a sample feeding and analysis valve 19 is provided at the gas inlet of the analysis unit 20 for detecting and analyzing volatile components.

[0046] A method for vacuum degassing volatile components in a coal mixed pyrolysis raw material according to the present invention includes the following steps:

[0047] Step 1, as Figure 2 , the process of the vacuum degassing system for volatile components in the mixed raw material 1 before pulverization. Specifically, after the mixed raw material 1 is weighed by a weighing instrument 6, it is placed in a closed pyrolysis tank 11, and the sampling valve 12 at the volatile gas outlet of the pyrolysis tank 11 is closed. The vacuum pump 10 is turned on to make the pyrolysis tank 11 in a vacuum state until the vacuum pressure gauge shows a negative value. The gas collection bottle inlet valve 15 is opened to ensure that gas enters the gas collection bottle 18. The sampling valve 12 is slowly opened to allow the gas in the pyrolysis tank 11 to automatically enter the gas collection bottle 18 of the subsequent sampling device until the vacuum pressure gauge of the vacuum pump 10 returns to normal. This step can be repeated multiple times according to specific conditions, with an interval of about 15 min - 20 min each time, until the flow meter 13 shows that the amount of gas extracted is less than 10 ml, and the gas extraction ends. The gas collected in the gas collection bottle 18 is sent to the analysis unit 20 through the sample feeding and analysis valve 19 for further processing and analysis to obtain the components and content of the volatile components precipitated from the mixed pyrolysis raw material at room temperature.

[0048] Step 2, as Figure 3, the process of the low-temperature heating vacuum degassing system for the volatile matter in the mixed raw material 1 before pulverization; specifically, after the end of the above-mentioned step one, turn on the heating device 7 and control the temperature to about 100 °C, and assist the mixed raw material 1 that has released volatile matter gas at room temperature in the pyrolysis tank 11 to release volatile matter at a lower heating temperature; open the condenser inlet valve 14 and the condenser outlet valve 17 to ensure that the gas enters the gas collecting bottle 18; slowly open the sampling valve 12 to make the gas in the pyrolysis tank 11 automatically enter the subsequent sampling device. Specifically, the volatile matter gas enters the gas collecting bottle 18 through the condenser 16 until the vacuum pressure gauge of the vacuum pump 10 returns to normal. This step can be repeated multiple times according to specific conditions, with an interval of about 15 min - 20 min each time, until the flowmeter 13 shows that the volume of the extracted gas is less than 10 ml, and then stop the gas extraction; the gas collected in the gas collecting bottle 18 is sent to the analysis unit 20 through the sample delivery analysis valve 19 for further processing and analysis to obtain the components and content of the volatile matter released from the mixed pyrolysis raw material before pulverization under the condition of low-temperature heating at 100 °C.

[0049] Step three, as Figure 4 , the process of the low-temperature vacuum degassing system for the volatile matter in the mixed raw material after pulverization; specifically, after the end of the above-mentioned step two, directly discharge the mixed raw material 1 in the pyrolysis tank 11 that has released volatile matter gas under low-temperature heating to the feed valve 2. This process is a sealed operation. Specifically, the mixed raw material 1 is pulverized to a suitable particle size by the ball mill 3 through the feed valve 2, such as a grinding particle size of about 200 mesh, weighed by the weighing instrument 6 after passing through the hopper 4 and the discharge valve 5, and then sent into the sealed pyrolysis tank 11; this pulverization system is carried out under vacuum sealing conditions and is controlled by the vacuum pump 10 and the vacuum valve 9 of the raw material processing system, which can avoid the loss of volatile matter during the pulverization process of the raw material; close the sampling valve 12 at the outlet of the pyrolysis tank 11, turn on the vacuum pump 10 to make the pyrolysis tank 11 in a vacuum state; turn on the heating device 7 and control the temperature to about 100 °C to assist the mixed coal sample in the pyrolysis tank 11 to release volatile matter at a lower temperature. Open the condenser inlet valve 14 and the condenser outlet valve 17 to ensure that the gas enters the gas collecting bottle 18; slowly open the sampling valve 12 to make the gas in the pyrolysis tank 11 automatically enter the subsequent sampling device, and enter the gas collecting bottle 18 through the condenser 16 until the vacuum pressure gauge of the vacuum pump 10 returns to normal. The gas collected in the gas collecting bottle 18 is sent to the analysis unit 20 through the sample delivery analysis valve 19 for further processing and analysis to obtain the components and content of the volatile matter released from the mixed pyrolysis raw material after pulverization under the condition of low-temperature heating at 100 °C.

[0050] Step four, as Figure 4, the process of the high-temperature vacuum degassing system for the volatile matter in the mixed raw materials after pulverization; consistent with the third step, it should be noted that the heating device 7 controls the temperature at about 900 °C, and the mixed raw materials 1 after pulverization in the auxiliary pyrolysis tank 11 release volatile matter at a relatively high temperature after releasing volatile matter at a low temperature, and the components and contents of the volatile matter released from the pulverized mixed pyrolysis raw materials are obtained under the condition of 900 °C high-temperature heating.

[0051] Step Five, calculate and analyze the components and contents of the volatile matter released in the above four vacuum degassing steps, and the total amount and composition structure of the volatile matter in a coal mixed pyrolysis raw material can be obtained.

[0052] Specifically, Steps One to Four can be repeated multiple times separately according to specific circumstances, with an interval of about 15 min - 20 min each time, until the gas flowmeter 13 shows that the amount of gas extracted is less than 10 ml, then stop the gas extraction and proceed to the next step.

Claims

1. A vacuum degassing method for volatile matter in coal mixed pyrolysis raw materials, characterized in that: A vacuum degassing system for volatile matter in a coal mixed pyrolysis raw material, the vacuum degassing system comprising a mixed raw material processing system (21), a vacuum pumping system (22), a mixed pyrolysis reaction system (23) and a volatile matter gas collection system (24); The mixed pyrolysis reaction system (23) comprises a pyrolysis tank (11); The mixed raw material processing system (21) comprises a feed valve (2) and a weighing instrument (6) which are sequentially arranged on a feed pipeline; The feed port of the pyrolysis tank (11) is connected to the discharge port of the weighing instrument (6), and the discharge port of the pyrolysis tank (11) is connected to the feed port of the feed valve (2); The vacuum pumping system (22) is respectively connected to the feed port of the feed valve (2) and the pyrolysis tank (11) in a sealed manner, and the air inlet of the volatile gas collection system (24) is connected to the volatile outlet at the top of the pyrolysis tank (11); The method comprises the following steps: Step 1: The vacuum system (22) evacuates the pyrolysis tank (11) to a vacuum state, and the mixed raw material (1) is put into the pyrolysis tank (11) through the weighing instrument (6), and the volatile gas is released at room temperature, and enters the volatile gas collection system (24), completing the volatile gas collection process at room temperature before the mixed raw material (1) is crushed; Step 2, raising the temperature in the pyrolysis tank (11) to 100° C., and sending the volatile gas released from the mixed raw material (1) at room temperature to the volatile gas collection system (24), thereby completing the volatile gas collection process of the mixed raw material (1) under low temperature heating before crushing; Step 3: The mixed raw material (1) from which volatile gas is released under low-temperature heating is discharged to the mixed raw material processing system (21) through the feed valve (2), and is crushed under vacuum conditions and discharged into the pyrolysis tank (11), and volatile gas is released under heating at 100° C. to the volatile gas collection system (24), thereby completing the volatile gas collection process at low temperature after the mixed raw material (1) is crushed; Step 4, the temperature in the pyrolysis tank (11) is raised to 900° C., the mixed raw material (1) is heated after being crushed and volatiles are removed at low temperature, and the volatile gas released is sent to the volatile gas collection system (24), thus completing the volatile collection process of the mixed raw material (1) at high temperature after being crushed; Step 5: Calculate and analyze the components and contents of all volatile components precipitated in the four vacuum degassing steps in steps 1 to 4 to obtain the total amount and composition structure of the volatile components in the coal mixed raw material (1).

2. The vacuum degassing method for volatile matter in coal mixed pyrolysis raw materials according to claim 1, characterized in that: Steps 1 to 4 were repeated several times, each with an interval of 15-20 minutes, until the volatile gas flow rate was less than 10 ml, and then the next step was performed.

3. The vacuum degassing method for volatile matter in coal mixed pyrolysis raw materials according to claim 1, characterized in that: The mixed raw material processing system (21) also includes a ball mill (3), a hopper (4) and a discharge valve (5) which are sealed and connected in sequence, the discharge port of the feed valve (2) is connected to the ball mill (3), and the discharge valve (5) is sealed and connected to the feed port of the weighing instrument (6).

4. The vacuum degassing method for volatile matter in coal mixed pyrolysis raw materials according to claim 1, characterized in that: The vacuum pumping system (22) comprises a vacuum pump (10), and the vacuum pump (10) is connected to the pyrolysis tank (11) via the pyrolysis tank vacuum valve (8); the vacuum pump (10) is connected to the feed port of the feed valve (2) via the raw material processing system vacuum valve (9), so as to evacuate the mixed raw material processing system (21).

5. The vacuum degassing method for volatile matter in coal mixed pyrolysis raw materials according to claim 1, characterized in that: The volatile gas collection system (24) comprises a gas collection bottle (18) connected to the volatile outlet of the pyrolysis tank (11) via a gas collection pipeline, and a flow meter (13) is arranged on the gas collection pipeline.

6. The vacuum degassing method for volatile matter in coal mixed pyrolysis raw materials according to claim 5, characterized in that: The volatile gas collection system (24) further comprises a condenser (16) connected in parallel to the gas collection pipeline; the gas inlet of the condenser (16) is connected to the gas collection pipeline after the flow meter (13), and the gas outlet is connected to the gas inlet of the gas collection bottle (18).

7. The vacuum degassing method for volatile matter in coal mixed pyrolysis raw materials according to claim 6, characterized in that: The air inlet of the condenser (16) is provided with a condenser inlet valve (14), and the air outlet is provided with a condenser outlet valve (17).

8. The vacuum degassing method for volatile matter in coal mixed pyrolysis raw materials according to claim 5, characterized in that: The gas outlet of the gas collecting bottle (18) is connected to an analysis unit (20) for analyzing volatile components.

9. The vacuum degassing method for volatile matter in coal mixed pyrolysis raw materials according to claim 8, characterized in that: The air inlet of the analysis unit (20) is provided with a sample delivery analysis valve (19).

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