Coal quality analysis system and method

Abstract

The present disclosure relates to a coal quality analysis system and method, wherein the coal quality analysis system comprises: a first heating furnace configured to heat a coal sample to volatilize moisture in the coal sample; a second heating furnace configured to heat the coal sample after dehydration by the first heating furnace to volatilize volatile matter in the coal sample and cause reactions of sulfur components, carbon components and hydrogen components; a gas supply assembly comprising: a nitrogen gas source configured to supply nitrogen gas to the first heating furnace, and an oxygen gas source configured to supply oxygen gas to the second heating furnace; and a gas analysis assembly comprising a first branch and an analysis component, a first end of the first branch being connected to an exhaust port of the second heating furnace, a second end of the first branch being connected to the analysis component, the analysis component being configured to measure a content of the volatile matter and determine contents of the corresponding components according to reaction products of the sulfur components, the carbon components and the hydrogen components.

Description

Technical Field

[0001] This disclosure relates to the field of coal quality testing and analysis technology, and in particular to a coal quality analysis system and method. Background Technology

[0002] The analysis of coal composition mainly includes the detection of moisture, volatile matter, ash and total sulfur. Currently, the common method is to use physical heating combustion combined with chemical reaction to detect moisture, volatile matter, ash and total sulfur in coal.

[0003] Total sulfur content is primarily determined using coulometric titration. The coal sample is burned and decomposed in an air stream under the action of a catalyst, producing sulfur oxides. Sulfur dioxide is absorbed by potassium iodide solution, and the total sulfur content is determined by the iodine produced from the electrolysis of the potassium iodide solution. The total sulfur content in the coal is calculated based on the amount of electricity consumed in the electrolysis. The proportions of moisture, volatile matter, and ash in the coal are determined mainly by high-temperature heating and subsequent weighing.

[0004] Currently, the commonly used method mainly employs a combination of physical heating and combustion with chemical reactions to detect moisture, volatile matter, ash, and total sulfur content in coal. This method suffers from drawbacks such as a cumbersome testing process, high cost, low efficiency, and high labor consumption. Summary of the Invention

[0005] This disclosure provides a coal quality analysis system and method that can improve the efficiency of coal quality detection and analysis.

[0006] According to a first aspect of this disclosure, a coal quality analysis system is provided, comprising:

[0007] The first heating furnace is configured to heat the coal sample to evaporate the moisture in the coal sample;

[0008] The second heating furnace is configured to heat the coal sample dehydrated by the first heating furnace, so that the volatile matter in the coal sample volatilizes and the anti-sulfur, carbon and hydrogen components are generated.

[0009] The gas supply assembly includes: a nitrogen source and an oxygen source, wherein the nitrogen source is configured to supply nitrogen to a first heating furnace, and the oxygen source is configured to supply oxygen to a second heating furnace; and

[0010] The gas analysis assembly includes a first branch and an analysis component. A first end of the first branch is connected to the exhaust port of a second heating furnace, and a second end of the first branch is connected to the analysis component. The analysis component is configured to measure the content of volatiles and determine the content of corresponding components based on the reaction products of sulfur, carbon, and hydrogen components.

[0011] In some embodiments, the coal quality analysis system further includes a gas circulation component configured to circulate nitrogen gas inside during operation of the first heating furnace, and / or to circulate oxygen gas inside during operation of the second heating furnace.

[0012] In some embodiments, the first end of the first branch may be selectively connected to the exhaust port of a first heating furnace or a second heating furnace, and the gas circulation assembly includes: a second branch and a pump;

[0013] The gas analysis component further includes: a first reversing valve, disposed on a first branch and having a first state and a second state, configured to connect the first branch to the analysis component in the first state and to connect the pump inlet to the exhaust port of the first or second heating furnace in the second state, so that the gas discharged from the exhaust port of the first or second heating furnace is supplied to its respective circulation port through a portion of the first branch and the second branch.

[0014] In some embodiments, the gas circulation assembly further includes a molecular sieve disposed on a second branch and configured to remove impurities from the gas.

[0015] In some embodiments, the coal quality analysis system further includes a backflush gas source and a sample introduction component. The sample introduction component includes a third branch configured to introduce a coal sample into a first heating furnace or a second heating furnace. The gas circulation component further includes a second reversing valve disposed on the second branch and having a first state and a second state.

[0016] The second reversing valve is configured to connect the second branch to the circulation port of the first or second heating furnace in the first state and connect the pump's air inlet to the first reversing valve; and in the second state, to connect the second branch to at least one of the backflush port of the first or second heating furnace and the third branch, and connect the pump's air inlet to the backflush air source.

[0017] In some embodiments, the gas circulation assembly further includes a third reversing valve disposed on the second branch and connected to the pump's exhaust port, the third reversing valve having a first state and a second state.

[0018] The third reversing valve is configured to allow gas to enter the second branch in the first state and to discharge gas to the outside in the second state.

[0019] In some embodiments, the gas analysis assembly further includes: a first cooler, disposed on a first branch, configured to be turned on when gas composition needs to be analyzed, and to cool the gas discharged from the exhaust port of the second furnace.

[0020] In some embodiments, the gas analysis component further includes a calorimeter disposed on the first branch and configured to measure the heat of combustion of the coal sample;

[0021] The calorimeter is configured to be on when measuring the heat of combustion of the coal sample and off when analyzing the gas composition, and the first cooler is configured to be off when measuring the heat of combustion of the coal sample.

[0022] In some embodiments, the coal quality analysis system further includes a sample introduction component, which includes:

[0023] The first thermal balance is configured to weigh a pre-set weight of coal sample so that the coal sample can enter the first heating furnace; and

[0024] The second thermobalance is configured to weigh the dehydrated coal sample after all the moisture has evaporated to determine the moisture content in the coal sample, and / or weigh the ash after all the volatile matter has evaporated and the sulfur, carbon and hydrogen components have reacted to determine the ash content.

[0025] In some embodiments, the injection component further includes:

[0026] The third branch road;

[0027] The first sampling unit is configured to allow a coal sample from the first thermal balance to enter the first heating furnace via a third branch through pulsed air intake; and

[0028] The second sampling unit is configured to allow the dehydrated coal sample in the second thermal balance to enter the second heating furnace through the third branch via pulsed air intake.

[0029] In some embodiments, the injection component further includes:

[0030] The third branch road;

[0031] The first valve, located on the third branch, is configured to, when open, connect the third branch to allow the coal sample to enter either the first or second heating furnace; and

[0032] The second cooler, located on the third branch and downstream of the first valve, is configured to reduce the coal sample to a preset temperature.

[0033] In some embodiments, the injection component further includes:

[0034] The first suction component is configured to remove dust from the first thermal balance; and / or

[0035] The second suction component is configured to remove dust from the second thermal balance.

[0036] In some embodiments, the gas supply assembly further includes:

[0037] The fourth branch, the first end of which can be selectively connected to a nitrogen source or an oxygen source, and the second end of which can be selectively connected to the air inlet of the first heating furnace or the second heating furnace;

[0038] A throttle valve, located on the fourth branch, is configured to adjust the gas flow rate;

[0039] The pressure reducing valve, located on the fourth branch and downstream of the throttle valve, is configured to reduce the gas pressure;

[0040] The pressure regulating valve, located on the fourth branch and downstream of the pressure reducing valve, is configured to keep the gas pressure value stable.

[0041] A one-way valve, located on the fourth branch and downstream of the pressure regulator, is configured to allow gas to flow only from the nitrogen source to the first heating furnace, or from the oxygen source to the second heating furnace; and

[0042] An on / off valve, located on the fourth branch and downstream of the check valve, is configured to control the on / off state of the fourth branch.

[0043] In some embodiments, the first heating furnace is configured to heat the coal sample at a first preset temperature to evaporate the moisture; the second heating furnace is configured to heat the dehydrated coal sample at a second preset temperature to completely evaporate the volatile matter, and continue to heat the coal sample at a temperature corresponding to a third preset temperature range to completely react the sulfur, carbon and hydrogen components, and finally form ash.

[0044] The second preset temperature is higher than the first preset temperature, and the lowest point of the third preset temperature range is higher than the second preset temperature.

[0045] According to a second aspect of this disclosure, an analytical method based on the coal quality analysis system of the above embodiments is provided, comprising:

[0046] Nitrogen gas is supplied to the first heating furnace through a nitrogen gas source;

[0047] Oxygen is supplied to the second heating furnace through an oxygen source;

[0048] The coal sample is heated in the first heating furnace to evaporate the moisture in the coal sample;

[0049] The coal sample dehydrated in the first heating furnace is heated by the second heating furnace so that the volatile matter in the coal sample volatilizes and the sulfur, carbon and hydrogen components react.

[0050] The content of volatiles in the gas discharged from the exhaust port of the second heating furnace is measured by analyzing the components, and the content of the corresponding components is determined based on the reaction products of sulfur, carbon and hydrogen.

[0051] In some embodiments, the analysis method further includes:

[0052] The nitrogen gas inside the first heating furnace is circulated during operation by a gas circulation assembly, and / or the oxygen gas inside the second heating furnace is circulated during operation.

[0053] In some embodiments, the first end of the first branch can be selectively connected to the exhaust port of a first heating furnace or a second heating furnace, and the gas circulation assembly includes: a second branch and a pump; the gas analysis assembly further includes: a first reversing valve disposed on the first branch, having a first state and a second state;

[0054] The circulation of nitrogen gas inside the first heating furnace during operation via a gas circulation assembly includes:

[0055] Connect the first end of the first branch to the exhaust port of the first heating furnace;

[0056] Set the first reversing valve to the second state, so that the pump's inlet is connected to the exhaust port of the first heating furnace, thereby supplying nitrogen gas discharged from the first heating furnace to the circulation port through a section of the first branch and the second branch; or

[0057] The circulation of nitrogen gas inside the first heating furnace during operation via a gas circulation assembly includes:

[0058] Connect the first end of the first branch to the exhaust port of the second heating furnace;

[0059] The first reversing valve is set to the second state so that the pump's air inlet is connected to the exhaust port of the second heating furnace, thereby supplying the oxygen discharged from the second heating furnace to the circulation port through a section of the first branch and the second branch.

[0060] In some embodiments, the coal quality analysis system further includes a gas circulation assembly, a backflushing gas source, and a sample introduction component. The sample introduction component includes a third branch configured to introduce the coal sample into a first or second heating furnace. The gas circulation assembly includes a second branch and a pump. The analysis method further includes:

[0061] After the coal sample has been heated and discharged, the pump inlet is connected to the backflush gas source to provide backflush gas to at least one of the backflush ports of the first or second heating furnace and the third branch through the second branch to achieve purging.

[0062] In some embodiments, the gas analysis component further includes: a first cooler and a calorimeter both disposed on the first branch, and the analysis method further includes:

[0063] When it is necessary to analyze the gas composition, the first cooler is turned on and the calorimeter is turned off to cool the gas discharged from the exhaust port of the second heating furnace.

[0064] When it is necessary to measure the heat of combustion of a coal sample, the calorimeter is turned on and the first cooler is turned off to measure the heat of combustion of the coal sample.

[0065] In some embodiments, the analysis method further includes:

[0066] Before heating the coal sample in the first heating furnace, the coal sample of a preset weight is weighed by the first thermal balance, and the coal sample is put into the first heating furnace by pulse air intake.

[0067] After the moisture in the coal sample has completely evaporated, the coal sample is discharged to a second thermal balance to weigh the dehydrated coal sample.

[0068] The moisture content in the coal sample is determined based on the preset weight and the weight of the dehydrated coal sample.

[0069] In some embodiments, the analysis method further includes:

[0070] After the volatile matter has volatilized and the sulfur, carbon, and hydrogen components have reacted completely, the coal sample is discharged to a second thermal balance to weigh the ash content and determine its ash content; or

[0071] The ash content is determined based on the preset weight, sulfur content, carbon content, and hydrogen content.

[0072] The coal quality analysis system of this disclosure uses nitrogen gas introduced into a first heating furnace as the ambient gas during the coal sample heating process. This allows the moisture in the coal sample to evaporate, preventing the volatilization of volatiles and the reaction of sulfur, carbon, and hydrogen components. The dehydrated coal sample from the first heating furnace can then enter a second heating furnace, where oxygen is introduced to further volatilize volatiles and allow the sulfur, carbon, and hydrogen components to react. Thus, the entire process achieves rapid combustion of the coal sample through physical heating alone, enabling the determination of the corresponding contents of volatiles, sulfur, carbon, and hydrogen components. This reduces the difficulty and cost of the detection process, improves analytical efficiency, and reduces manpower consumption. Attached Figure Description

[0073] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0074] Figure 1 This is a schematic diagram of the working principle of the first heating furnace in some embodiments of the coal quality analysis system disclosed herein.

[0075] Figure 2 This is a schematic diagram of the working principle of the second heating furnace in some embodiments of the coal quality analysis system disclosed herein.

[0076] Explanation of reference numerals in the attached figures

[0077] 1. First heating furnace; 1'. Second heating furnace; 11. Air inlet; 12. Sample inlet; 13. Exhaust port; 14. Backflush port; 15. Circulation port; 16. Second valve;

[0078] 2. Gas supply components; 21. Nitrogen gas source; 22. Oxygen gas source; 23. Throttling valve; 24. Pressure reducing valve; 25. Pressure regulating valve; 26. Check valve; 27. On / off valve; 28. Fourth branch;

[0079] 3. Gas analysis assembly; 31. First cooler; 32. Calorimeter; 33. First reversing valve; 33A. First gas inlet; 33B. First gas outlet; 33C. Second gas outlet; 34. First branch; 35. Quantitative tube; 36. Analysis component;

[0080] 4. Gas circulation assembly; 41. Pump; 42. Third directional valve; 42A. Third air inlet; 42B. Fifth air outlet; 42C. Sixth air outlet; 43. Molecular sieve; 44. Second branch; 45. Second directional valve; 45A. Second air inlet; 45B. Third air outlet; 45C. Fourth air outlet; 46. Backflush air source;

[0081] 5. Sample inlet unit; 51. First valve; 52. Second cooler; 53. Third branch; 54. First sampling unit; 55. Second sampling unit;

[0082] 6. The first hot balance;

[0083] 7. First suction component;

[0084] 8. The second thermal balance;

[0085] 9. Second suction component;

[0086] 10. Fifth Branch Road. Detailed Implementation

[0087] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0088] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0089] In the description of this disclosure, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing this disclosure and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this disclosure; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0090] In the description of this disclosure, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this disclosure.

[0091] like Figure 1 and Figure 2 As shown, this disclosure provides a coal quality analysis system, which in some embodiments includes: a first heating furnace 1, a second heating furnace 1', a gas supply component 2, and a gas analysis component 3.

[0092] The first heating furnace 1 is configured to heat the coal sample to evaporate the moisture in the coal sample. The second heating furnace 1' is configured to heat the coal sample after it has been dehydrated by the first heating furnace 1, so that the volatile matter in the coal sample evaporates and the sulfur, carbon and hydrogen components react. For example, coils are wound inside the first heating furnace 1 and the second heating furnace 1' to heat the furnace to a certain temperature, and the furnace body is equipped with an insulation layer to reduce heat exchange with the outside environment.

[0093] The gas supply assembly 2 includes a nitrogen source 21 and an oxygen source 22. The nitrogen source 21 is configured to supply nitrogen to the first heating furnace 1, and the oxygen source 22 is configured to supply oxygen to the second heating furnace 1'.

[0094] The gas analysis component 3 includes a first branch 34 and an analysis component 36. The first heating furnace 1 has an exhaust port 13. The first end of the first branch 34 is connected to the exhaust port 13 of the second heating furnace 1'. The second end of the first branch 34 is connected to the analysis component 36. The analysis component 36 is configured to measure the content of volatiles and determine the content of corresponding components based on the reaction products of sulfur, carbon and hydrogen components.

[0095] This embodiment uses nitrogen gas introduced into the first heating furnace 1 as the ambient gas during the coal sample heating process. This allows the moisture in the coal sample to evaporate, preventing the volatilization of volatiles and the reaction of sulfur, carbon, and hydrogen components. After dehydration in the first heating furnace 1, the coal sample can enter the second heating furnace 1'. Introducing oxygen into the second heating furnace 1' allows the volatiles in the dehydrated coal sample to evaporate, and the sulfur, carbon, and hydrogen components to react. Introducing oxygen to volatilize the volatiles in the dehydrated coal sample is based on the consideration that most components in the volatiles readily react with oxygen, while other non-reactive components can volatilize through heating. Compared to introducing nitrogen or other gases, this method improves the efficiency of volatile release from the dehydrated coal sample.

[0096] Therefore, compared with existing technologies that require chemical reactions, the entire process can achieve rapid combustion of coal samples through physical heating alone, enabling the determination of the corresponding contents of volatile matter, sulfur, carbon and hydrogen. This reduces the difficulty and cost of the detection process, improves the efficiency of detection and analysis, and reduces manpower consumption.

[0097] By setting up two heating furnaces, the first heating furnace 1 and the second heating furnace 1' can be preheated to a suitable temperature simultaneously before heating the coal sample, or the second heating furnace 1' can be preheated to a suitable temperature while the first heating furnace 1 is heating and evaporating moisture. This saves preheating time and avoids frequent heating and cooling of the furnaces and gas lines, thus improving detection efficiency. Optionally, while the second heating furnace 1' is heating the dehydrated coal sample, a new coal sample can also be introduced into the first heating furnace 1 for dehydration. This method makes the entire detection process more compact and is suitable for analyzing multiple batches of coal samples, thereby improving detection efficiency.

[0098] Both the first heating furnace 1 and the second heating furnace 1' are connected to the controller and display in the analysis system. When testing is required, both the first heating furnace 1 and the second heating furnace 1' are in standby mode. Different high-temperature furnaces are switched according to different testing stages. When the entire system is filled with nitrogen or oxygen and the first heating furnace 1 or the second heating furnace 1' reaches the set temperature, the system is ready and the testing process begins.

[0099] In some embodiments, the coal quality analysis system further includes a gas circulation component 4, configured to circulate nitrogen gas inside the first heating furnace 1 during operation, and / or to circulate oxygen gas inside the second heating furnace 1' during operation.

[0100] This embodiment enables the formation of a circulating gas path within the heating furnace during the coal sample heating process, effectively increasing the contact area between the coal sample and the circulating gas, thereby shortening the reaction time of the coal sample and improving the efficiency of the entire detection and analysis process. By circulating nitrogen gas in the first heating furnace 1, the volatilization of moisture in the coal sample inside the furnace can be accelerated. By circulating oxygen gas in the second heating furnace 1', the volatilization of volatiles and the reaction of sulfur, carbon, and hydrogen components in the coal sample inside the furnace can be accelerated.

[0101] In some embodiments, the first end of the first branch 34 may be selectively connected to the exhaust port 13 of the first heating furnace 1 or the second heating furnace 1', for example, by switching via a control valve. The gas circulation assembly 4 includes: the second branch 44 and the pump 41.

[0102] The gas analysis assembly 3 further includes a first reversing valve 33, for example, a two-position three-way reversing valve, disposed on the first branch 34, and having a first state and a second state. The first reversing valve 33 is configured to connect the first branch 34 to the analysis unit 36 ​​in the first state, and to connect the inlet of the pump 41 to the exhaust port 13 of the first heater 1 or the second heater 1' in the second state, so that the gas discharged by the first heater 1 or the second heater 1' through the exhaust port 13 is supplied to its respective recirculation port 15 through a portion of the first branch 34 and the second branch 44.

[0103] This embodiment enables the gas analysis component 3 and the gas circulation component 4 to share a section of pipeline, which can reduce the complexity of the system pipeline. The first branch 34 can be used for gas composition analysis or gas circulation by switching the state of the first reversing valve 33.

[0104] In some embodiments, the gas circulation assembly 4 further includes a molecular sieve 43 disposed on the second branch 44 and configured to remove impurities from the gas.

[0105] This embodiment, by setting molecular sieve 43, can remove impurities in the circulating gas during the heating process of the heating furnace, so that the circulating gas flows smoothly in various valves and other components, reducing the impact on the coal sample combustion process. It can also filter impurities in the gas during the subsequent gas backflushing process, making the heating furnace cleaner.

[0106] In some embodiments, the coal quality analysis system further includes a backflushing gas source 46 and a sample introduction component 5. The sample introduction component 5 includes a third branch 53 and is configured to introduce a coal sample into a first heating furnace 1 or a second heating furnace 1'. The gas circulation component 4 also includes a second reversing valve 45, which is disposed on the second branch 44 and has a first state and a second state. For example, the second reversing valve 45 may be a two-position three-way solenoid valve.

[0107] The second reversing valve 45 is configured to connect the second branch 44 to the circulation port 15 of the first heating furnace 1 or the second heating furnace 1' in the first state, and to connect the air inlet of the pump 41 to the first reversing valve 33. The connection between the second branch 44 and the circulation port 15 of the first heating furnace 1 or the second heating furnace 1' is optional, for example, it can be switched by a control valve.

[0108] Furthermore, the second reversing valve 45 is configured, in the second state, to connect the second branch 44 to at least one of the backflush port 14 of the first heating furnace 1 or the second heating furnace 1' and the third branch 53. The backflush port 14 and the third branch 53 can be connected via the fifth branch 10, and the air inlet of the pump 41 is connected to the backflush air source 46. The second branch 44 can be selectively connected to the backflush port 14 of the first heating furnace 1 or the second heating furnace 1', for example, by switching via a control valve. The air inlet of the pump 41 can be selectively connected to the first reversing valve 33 or the backflush air source 46.

[0109] Specifically, the first reversing valve 33 has a first air inlet 33A, a first air outlet 33B, and a second air outlet 33C. The first air inlet 33A is selectively connected to the exhaust port 13 of the first heating furnace 1 or the second heating furnace 1'. The first air outlet 33B is connected to the analysis unit 36, and the second air outlet 33C is connected to the air inlet of the pump 41. The second reversing valve 45 has a second air inlet 45A, a third air outlet 45B, and a fourth air outlet 45C. The second air inlet 45A is connected to the exhaust port of the pump 41. The third air outlet 45B is connected to the backflush port 14, and the fourth air outlet 45C is connected to the circulation port 15.

[0110] This embodiment enables backflushing of the first heating furnace 1 or the second heating furnace 1' after the test is completed, thereby cleaning the high-temperature furnace, preventing residual coal samples from affecting the next test, and effectively reducing the maintenance frequency of the test system.

[0111] In some embodiments, the gas circulation assembly 4 further includes a third reversing valve 42, disposed on the second branch 44 and connected to the exhaust port of the pump 41. The third reversing valve 42 has a first state and a second state; wherein, the second reversing valve 45 is configured to allow gas to enter the second branch 44 in the first state and to allow gas to be discharged to the outside in the second state. For example, the third reversing valve 42 is a two-position three-way reversing valve. Specifically, the third reversing valve 42 has a third inlet 42A, a fifth outlet 42B, and a sixth outlet 42C. The third inlet 42A is connected to the exhaust port of the pump 41, the fifth outlet 42B is connected to the molecular sieve 43, and the sixth outlet 42C is connected to the outside.

[0112] This embodiment can realize gas circulation during the coal sample heating process as needed, realize backflushing after the coal sample is tested, and switch the third reversing valve 42 to the second state when the internal gas pressure is too high when the heating furnace is working or when the gas in the heating furnace or pipeline needs to be discharged after the test is completed.

[0113] In some embodiments, the gas analysis component 3 further includes a first cooler 31, disposed on the first branch 34, configured to be in an open state when gas composition needs to be analyzed, and to cool the gas discharged from the exhaust port 13 of the second heating furnace 1'.

[0114] This embodiment can cool the gas discharged from the second heating furnace 1' to prevent the gas after volatilization or reaction from absorbing heat from the external environment, thereby improving the accuracy of detecting the content of volatile matter, sulfur, carbon and hydrogen after coal sample heating.

[0115] In some embodiments, the gas analysis component 3 further includes a calorimeter 32, disposed on the first branch 34, which may be integrated with the first cooler 31 or disposed separately, and configured to measure the heat of combustion of the coal sample. The calorimeter 32 is configured to be in an on state when measuring the heat of combustion of the coal sample and in an off state when analyzing gas composition, and the first cooler 31 is configured to be in an off state when measuring the heat of combustion of the coal sample.

[0116] This embodiment can measure the heat of combustion while the gas passes through the first branch 34 for component detection, enabling multi-purpose switching. If only the heat of combustion of the coal sample needs to be measured, the first cooler 31 is in the off state and the calorimeter 32 is in the on state; if only the content of volatile matter, carbon, sulfur and hydrogen in the coal sample needs to be measured, the first cooler 31 is in the on state and the calorimeter 32 is in the off state; if it is necessary to simultaneously measure the heat of combustion of the coal sample and the content of volatile matter, carbon, sulfur and hydrogen, both the first cooler 31 and the calorimeter 32 are in the on state, and the calorimeter 32 can be located downstream of the first cooler 31.

[0117] like Figure 1 As shown, the gas analysis component 3 also includes a metering tube 35, located between the first reversing valve 33 and the analysis component 36, configured to take a metered amount of gas for detection and analysis. Specifically, the first inlet 33A of the first reversing valve 33 is connected to the exhaust port 13 of the first heating furnace 1 or the second heating furnace 1' via the first cooler 31 and the calorimeter 32, the first outlet 33B is connected to the metering tube 35, and the second outlet 33C is connected to the inlet of the pump 41.

[0118] In some embodiments, the coal quality analysis system further includes a sample introduction component 5, which comprises: a first thermal balance 6, configured to weigh a predetermined weight of coal sample to allow the coal sample to enter the first heating furnace 1; and a second thermal balance 8, configured to weigh the dehydrated coal sample after moisture has evaporated to determine the moisture content in the coal sample, and / or to weigh the ash content after volatile matter has evaporated and sulfur, carbon, and hydrogen components have reacted. For example, both the first thermal balance 6 and the second thermal balance 8 employ a sealed structure.

[0119] Specifically, a second valve 16, such as a plate gate, can be installed at the bottom of either the first heating furnace 1 or the second heating furnace 1'. The second thermal balance 8 can be selectively connected to the bottom of either the first heating furnace 1 or the second heating furnace 1'.

[0120] When the second thermal balance 8 is connected to the first heating furnace 1, and the second valve 16 at the bottom of the first heating furnace 1 is open, the coal sample dehydrated by the first heating furnace 1 falls into the second thermal balance 8. The moisture content can then be determined by weighing the coal sample. When the second thermal balance 8 is connected to the second heating furnace 1', and the second valve 16 at the bottom of the second heating furnace 1' is open, the coal sample dehydrated by the first heating furnace 1 falls into the second thermal balance 8. The ash content can then be determined by weighing the ash content.

[0121] This embodiment can accurately determine the moisture content in a coal sample based on a preset weight and the weight of the dehydrated coal sample. After the volatile matter in the dehydrated coal sample has volatilized and the sulfur, carbon and hydrogen components have reacted, the ash weight is measured to accurately determine the ash content.

[0122] In some embodiments, the sample introduction component 5 further includes a third branch 53, a first sampling component 54, and a second sampling component 55. The first sampling component 54 is configured to allow a coal sample from the first thermal balance 6 to enter the first heating furnace 1 through the third branch 53 via pulsed air intake; the second sampling component 55 is configured to allow a dehydrated coal sample from the second thermal balance 8 to enter the second heating furnace 1' through the third branch 53 via pulsed air intake. The third branch 53 can be selectively connected to the sample inlet 12 of either the first heating furnace 1 or the second heating furnace 1', and the first heating furnace 1 and the second heating furnace 1' share the third branch 53. The duration of the pulsed air intake sampling is adjusted accordingly based on the test conditions.

[0123] This embodiment uses a sampling component to uniformly introduce coal samples into the heating furnace via pulsed air intake, eliminating the need for manual operation. This achieves automatic and efficient sample introduction and prevents other impurities from contaminating the coal sample and affecting the test results.

[0124] In some embodiments, the sample feeding component 5 further includes: a first valve 51 and a second cooler 52. The first valve 51 is disposed on the third branch 53, such as a gate valve, and is configured to connect the third branch 53 when open to allow the coal sample to enter the first heating furnace 1 or the second heating furnace 1'. The second cooler 52 is disposed on the third branch 53 and located downstream of the first valve 51, and is configured to reduce the coal sample to a preset temperature.

[0125] This embodiment can precisely control the sample injection by opening and closing the first valve 51, enabling automatic sample injection. Moreover, after passing through the second cooler 52, it can reduce the temperature of the coal sample, thereby reducing the evaporation of moisture in the coal sample during the process of entering the heating furnace. This allows the moisture to evaporate as much as possible during the heating process in the heating furnace, thus improving the accuracy of moisture content detection.

[0126] In some embodiments, the sample injection component 5 further includes: a first dust suction component 7 configured to remove dust from the first thermal balance 6; and / or a second dust suction component 9 configured to remove dust from the second thermal balance 8. This embodiment can remove dust from the thermal balance, clean the thermal balance after weighing the coal sample, and ensure that the thermal balance is in a clean environment before weighing, thereby improving the accuracy of weight detection.

[0127] In some embodiments, the gas supply assembly 2 further includes: a fourth branch 28, the first end of which is selectively connected to a nitrogen source 21 or an oxygen source 22, and the second end of which is selectively connected to the air inlet 11 of the first heating furnace 1 or the second heating furnace 1'; a throttle valve 23, disposed on the fourth branch 28, such as a ball valve, configured to adjust the gas flow rate; a pressure reducing valve 24, disposed on the fourth branch 28 and located downstream of the throttle valve 23, configured to reduce the gas pressure to a preset pressure; and a pressure regulating valve 25, disposed on the fourth branch 28 and located downstream of the throttle valve 23. Downstream of pressure reducing valve 24, it is configured to maintain a stable gas pressure value; one-way valve 26, located on the fourth branch 28 and downstream of pressure regulating valve 25, is configured to allow gas to flow only from nitrogen source 21 to the first heating furnace 1, or from oxygen source 22 to the second heating furnace 1', to prevent gas backflow in the heating furnace and improve gas supply safety; and on / off valve 27, located on the fourth branch 28 and downstream of one-way valve 26, is configured to control the on / off of the fourth branch 28 to supply gas to the first heating furnace 1 or the second heating furnace 1' when the fourth branch 28 is connected.

[0128] This embodiment controls the gas flow, pressure, flow rate and direction by setting multiple valves on the fourth branch 28, which can provide gas with appropriate pressure and flow rate to the first heating furnace 1 or the second heating furnace 1'.

[0129] In some embodiments, the first heating furnace 1 is configured to heat the coal sample at a first preset temperature to evaporate moisture; the second heating furnace 1' is configured to heat the dehydrated coal sample at a second preset temperature to completely evaporate the volatile matter, and then continue to heat the coal sample at a temperature corresponding to a third preset temperature range to completely react the sulfur, carbon, and hydrogen components, finally forming ash. The second preset temperature is higher than the first preset temperature, and the lowest point of the third preset temperature range is higher than the second preset temperature.

[0130] This embodiment can control the temperature of the heating furnace to allow moisture and volatiles to evaporate at appropriate temperature points, and to allow sulfur, carbon and hydrogen components to react at appropriate temperature points, so as to measure the content of each component through physical heating combustion.

[0131] The following is combined Figure 1 and Figure 2 The working principle of the coal sample analysis system disclosed herein is explained.

[0132] Firstly, when the first heating furnace 1 is working, the principle for detecting moisture in the coal sample is as follows: Figure 1 As shown.

[0133] 1. Turn on the nitrogen gas source 21, and pass it through the throttle valve 23, pressure reducing valve 24, pressure regulating valve 25, and check valve 26 in sequence. Then open the on / off valve 27 to send nitrogen into the first heating furnace 1 and the entire gas circuit. When the system displays that the charging is complete, disconnect the on / off valve 27.

[0134] 2. Weigh a certain amount of the processed coal sample using the first thermal balance 6, open the first valve 51, and use pulse air sampling to draw the sample into the second cooler 52, and then send the sample into the first heating furnace 1.

[0135] 3. Once the first heating furnace 1 reaches the set temperature and is ready, it begins operation. During the reaction of the coal sample in the first heating furnace 1, nitrogen gas is drawn in by pump 41. The nitrogen gas exiting from the exhaust port 13 of the first heating furnace 1 passes sequentially through the first cooler 31, calorimeter 32, first reversing valve 33, third reversing valve 42, molecular sieve 43, and second reversing valve 45A to form a nitrogen circulation path, accelerating the evaporation of moisture in the coal sample in the first heating furnace 1. During this process, the first cooler 31 and calorimeter 32 are in the off state.

[0136] 4. After the moisture in the coal sample in the first heating furnace 1 has evaporated completely, the second valve 16 is opened, and the airflow is used to impact the coal sample after the moisture has evaporated completely, causing it to gather on the second thermal balance 8 for weighing. The moisture content of the coal sample can then be calculated.

[0137] Next, when the second heating furnace 1' is working, the working principle for detecting volatile matter, sulfur, carbon, hydrogen, and ash in the coal sample is as follows: Figure 2 As shown.

[0138] 5. Turn on the oxygen source 22, and sequentially pass through the throttle valve 23, pressure reducing valve 24, pressure regulating valve 25, and check valve 26. Open the on / off valve 27 to send oxygen into the entire gas circuit of the second heating furnace 1'. When the system displays that the charging is complete, disconnect the on / off valve 27.

[0139] 6. Weigh a certain amount of dehydrated coal sample using the second thermal balance 8, open the first valve 51, and use pulse air sampling to draw the sample into the second cooler 52. Then send the sample into the second heating furnace 1', whose internal structure is completely consistent with the first heating furnace 1.

[0140] 7. Once the second heating furnace 1' reaches the set temperature and is ready, it will begin operation. During the reaction of the dehydrated coal sample in the second heating furnace 1', oxygen is drawn in by pump 41. The oxygen coming out of the exhaust port 13 of the second heating furnace 1' passes sequentially through the first cooler 31, calorimeter 32, first reversing valve 33, third reversing valve 42, molecular sieve 43, and second reversing valve 45A to form an oxygen circulation path, accelerating the reaction of the coal sample in the second heating furnace 1'.

[0141] 8. At a certain temperature, after the volatile matter in the coal sample in the second heating furnace 1' has completely volatilized and the carbon, sulfur, and hydrogen components have fully reacted, the sample passes through the first cooler 31 and the calorimeter 32. If only the content of volatile matter, carbon, sulfur, and hydrogen in the coal sample needs to be measured, the first cooler 31 is in the open state and the calorimeter 32 is in the closed state; if only the heat of combustion of the coal sample needs to be measured, the first cooler 31 is in the closed state and the calorimeter 32 is in the open state; if the content of volatile matter, carbon, sulfur, and hydrogen in the coal sample and the heat of combustion of the coal sample need to be measured simultaneously, both the first cooler 31 and the calorimeter 32 are in the working state. After passing through the first reversing valve 33 and the metering tube 35, the sample enters the gas analysis system to detect and analyze the composition of the coal sample.

[0142] 9. Weigh the coal sample after it has completely reacted in the second heating furnace 1' to determine the ash content in the coal sample; or estimate the ash content by using the determined contents of moisture, volatile matter, carbon, sulfur and hydrogen in the coal sample.

[0143] Secondly, this disclosure provides an analysis method based on the coal quality analysis system of the above embodiments, which in some embodiments includes:

[0144] S101, Nitrogen gas is supplied to the first heating furnace 1 through nitrogen gas source 21;

[0145] S102, oxygen is supplied to the second heating furnace 1' through oxygen source 22;

[0146] S103. The coal sample is heated by the first heating furnace 1 to evaporate the moisture in the coal sample;

[0147] S104. The coal sample dehydrated by the first heating furnace 1 is heated by the second heating furnace 1' so that the volatile matter in the coal sample volatilizes and the sulfur, carbon and hydrogen components react.

[0148] S105. The content of volatiles in the gas discharged from the exhaust port 13 of the second heating furnace 1' is measured by the analysis component 36, and the content of the corresponding components is determined according to the reaction products of sulfur, carbon and hydrogen components.

[0149] In this process, S101 is executed before S103, and S102 is executed before S104. The execution order of S101 and S102 is not restricted. S103 to S105 are executed sequentially. S101-S105 are not shown in the figure.

[0150] This embodiment uses nitrogen gas introduced into the first heating furnace 1 as the ambient gas during the coal sample heating process. This allows the moisture in the coal sample to evaporate, preventing the volatilization of volatiles and the reaction of sulfur, carbon, and hydrogen components. After dehydration in the first heating furnace 1, the coal sample can enter the second heating furnace 1'. Introducing oxygen into the second heating furnace 1' allows the volatiles in the dehydrated coal sample to evaporate, and the sulfur, carbon, and hydrogen components to react. Throughout the process, the coal sample can be rapidly combusted through physical heating, enabling the determination of the corresponding contents of volatiles, sulfur, carbon, and hydrogen components. This reduces the difficulty and cost of the detection process, improves the efficiency of detection and analysis, and reduces manpower consumption.

[0151] Before heating the coal sample, the first heating furnace 1 and the second heating furnace 1' can be preheated to a suitable temperature simultaneously, or the second heating furnace 1' can be preheated to a suitable temperature while the first heating furnace 1 is heating and evaporating moisture. This saves preheating time and avoids frequent heating and cooling of the furnaces and gas lines, thus improving detection efficiency. Optionally, while the second heating furnace 1' is heating the dehydrated coal sample, a new coal sample can be introduced into the first heating furnace 1 for dehydration. This method makes the entire detection process more compact and suitable for analyzing multiple batches of coal samples, thereby improving detection efficiency.

[0152] In some embodiments, the analysis method of this disclosure further includes:

[0153] S106. The nitrogen gas inside the first heating furnace 1 is circulated through the gas circulation assembly 4 during the operation of the first heating furnace 1, and / or the oxygen gas inside the second heating furnace 1' is circulated during the operation of the second heating furnace 1'.

[0154] S106 is executed simultaneously with either S103 or S104. S106 is not shown in the figure.

[0155] This embodiment can create a circulating gas path in the heating furnace during the heating of coal samples, effectively increasing the contact area between the coal sample and the circulating gas, thereby shortening the reaction time of the coal sample and improving the efficiency of the entire detection and analysis process.

[0156] In some embodiments, the first end of the first branch 34 may be selectively connected to the exhaust port 13 of the first heating furnace 1 or the second heating furnace 1'. The gas circulation assembly 4 includes: the second branch 44 and the pump 41. The gas analysis assembly 3 further includes: the first reversing valve 33, which is disposed on the first branch 34 and has a first state and a second state.

[0157] In S106, the nitrogen gas inside the first heating furnace 1 is circulated through the gas circulation component 4 during operation, including:

[0158] Connect the first end of the first branch 34 to the exhaust port 13 of the first heating furnace 1;

[0159] The first reversing valve 33 is put into the second state so that the air inlet of the pump 41 is connected to the exhaust port 13 of the first heating furnace 1, so that the nitrogen gas discharged from the first heating furnace 1 is supplied to the circulation port 15 through a section of the first branch 34 and the second branch 44 to form a nitrogen gas circulation loop.

[0160] In S106, the oxygen inside the second heating furnace 1' is circulated through the gas circulation assembly 4 during operation, including:

[0161] Connect the first end of the first branch 34 to the exhaust port 13 of the second heating furnace 1';

[0162] The first reversing valve 33 is put into the second state so that the air inlet of the pump 41 is connected to the exhaust port 13 of the second heating furnace 1', so that the oxygen discharged from the second heating furnace 1' is supplied to the circulation port 15 through a section of the first branch 34 and the second branch 44 to form an oxygen circulation loop.

[0163] In some embodiments, the coal quality analysis system further includes a backflushing gas source 46 and a sample introduction component 5, the sample introduction component 5 including a third branch 53 configured to introduce the coal sample into the first heating furnace 1 or the second heating furnace 1', the gas circulation component 4 including a second branch 44 and a pump 41, and the analysis method further including:

[0164] S107. After the coal sample has been heated and discharged, the air inlet of the pump 41 is connected to the backflush gas source 46 so as to provide backflush gas to at least one of the backflush port 14 of the first heating furnace 1 or the second heating furnace 1' and the third branch 53 through the second branch 44 to achieve purging.

[0165] S107 is not shown in the figure. This embodiment can backflush the first heating furnace 1 or the second heating furnace 1' after the test is completed, thereby cleaning the high-temperature furnace, preventing residual coal samples from affecting the next test, and effectively reducing the maintenance frequency of the test system.

[0166] In some embodiments, the gas analysis component 3 further includes: a first cooler 31 and a calorimeter 32, both disposed on the first branch 34, and the analysis method further includes:

[0167] When it is necessary to analyze the gas composition, the first cooler 31 is turned on and the calorimeter 32 is turned off to cool the gas discharged from the exhaust port 13 of the second heating furnace 1'.

[0168] When it is necessary to measure the heat of combustion of a coal sample, the calorimeter 32 is turned on and the first cooler 31 is turned off to measure the heat of combustion of the coal sample.

[0169] This embodiment enables the detection of gas composition or heat of combustion by selectively opening and closing the first cooler 31 and the calorimeter 32.

[0170] In some embodiments, the analysis method further includes:

[0171] Before heating the coal sample through the first heating furnace 1, the coal sample of a preset weight is weighed through the first thermal balance 6, and the coal sample is introduced into the first heating furnace 1 through pulse air intake;

[0172] After the moisture in the coal sample has completely evaporated, the coal sample is discharged to the second thermal balance 8 and the weight of the dehydrated coal sample is measured.

[0173] The moisture content in the coal sample is determined based on the preset weight and the weight of the dehydrated coal sample.

[0174] This embodiment can accurately determine the moisture content in a coal sample based on a preset weight and the weight of the dehydrated coal sample.

[0175] In some embodiments, the analysis method of this disclosure further includes:

[0176] After the volatile matter has volatilized and the sulfur, carbon, and hydrogen components have reacted, the coal sample is discharged to the second thermal balance 8 to weigh the ash content to determine its ash content; or

[0177] The ash content is determined based on the preset weight, sulfur content, carbon content, and hydrogen content.

[0178] This embodiment can measure the ash content after the volatile matter has volatilized and the sulfur, carbon and hydrogen components have reacted in the dehydrated coal sample, or it can calculate the ash content based on the weight of the dehydrated coal sample and the content of other gas components. Both methods can accurately determine the ash content.

[0179] In the above embodiments of this disclosure, each valve can be controlled by a controller, which can be a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof for performing the functions described in this disclosure.

[0180] The above description is merely an exemplary embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A coal quality analysis system, characterized in that, include: The first heating furnace (1) is configured to heat the coal sample to evaporate the moisture in the coal sample; The second heating furnace (1') is configured to heat the coal sample after it has been dehydrated by the first heating furnace (1) so that the volatiles in the coal sample volatilize and the anti-sulfur components, carbon components and hydrogen components react; The gas supply assembly (2) includes a nitrogen gas source (21) and an oxygen gas source (22), wherein the nitrogen gas source (21) is configured to supply nitrogen to the first heating furnace (1) and the oxygen gas source (22) is configured to supply oxygen to the second heating furnace (1'); The gas circulation assembly (4) is configured to circulate nitrogen gas inside the first furnace (1) during operation and to circulate oxygen gas inside the second furnace (1') during operation; and The gas analysis component (3) includes a first branch (34) and an analysis component (36). The first end of the first branch (34) is connected to the exhaust port (13) of the second heating furnace (1'), and the second end of the first branch (34) is connected to the analysis component (36). The analysis component (36) is configured to measure the content of volatiles and determine the content of corresponding components based on the reaction products of sulfur, carbon and hydrogen components.

2. The coal quality analysis system according to claim 1, characterized in that, The first end of the first branch (34) can be selectively connected to the exhaust port (13) of the first heating furnace (1) or the second heating furnace (1'), and the gas circulation assembly (4) includes: the second branch (44) and the pump (41). The gas analysis component (3) further includes: a first reversing valve (33), which is disposed on the first branch (34) and has a first state and a second state, configured to connect the first branch (34) to the analysis component (36) in the first state and to connect the inlet of the pump (41) to the exhaust port (13) of the first heating furnace (1) or the second heating furnace (1') in the second state, so that the gas discharged by the first heating furnace (1) or the second heating furnace (1') through the exhaust port (13) is supplied to the respective circulation port (15) through a portion of the first branch (34) and the second branch (44).

3. The coal quality analysis system according to claim 2, characterized in that, The gas circulation assembly (4) further includes a molecular sieve (43), disposed on the second branch (44), configured to remove impurities from the gas.

4. The coal quality analysis system according to claim 2, characterized in that, It also includes a backflush gas source (46) and a sample inlet component (5), the sample inlet component (5) including a third branch (53) configured to introduce the coal sample into the first heating furnace (1) or the second heating furnace (1'), the gas circulation assembly (4) also includes a second reversing valve (45) provided on the second branch (44) and having a first state and a second state; The second reversing valve (45) is configured to connect the second branch (44) to the circulation port (15) of the first heating furnace (1) or the second heating furnace (1') in the first state, and to connect the air inlet of the pump (41) to the first reversing valve (33); and to connect the second branch (44) to at least one of the backflush port (14) of the first heating furnace (1) or the second heating furnace (1') and the third branch (53) in the second state, and to connect the air inlet of the pump (41) to the backflush air source (46).

5. The coal quality analysis system according to claim 4, characterized in that, The gas circulation assembly (4) further includes a third reversing valve (42), which is located on the second branch (44) and connected to the exhaust port of the pump (41). The third reversing valve (42) has a first state and a second state. The third reversing valve (42) is configured to allow gas to enter the second branch (44) in the first state and to discharge gas to the outside in the second state.

6. The coal quality analysis system according to claim 1, characterized in that, The gas analysis component (3) further includes a first cooler (31), which is located on the first branch (34) and is configured to be in the open state when gas composition needs to be analyzed, and cools the gas discharged from the exhaust port (13) of the second heating furnace (1').

7. The coal quality analysis system according to claim 6, characterized in that, The gas analysis component (3) further includes a calorimeter (32), which is located on the first branch (34) and configured to measure the heat of combustion of the coal sample; The calorimeter (32) is configured to be in the on state when measuring the heat of combustion of the coal sample and in the off state when analyzing the gas composition, and the first cooler (31) is configured to be in the off state when measuring the heat of combustion of the coal sample.

8. The coal quality analysis system according to claim 1, characterized in that, It also includes a sample injection component (5), which includes: A first thermal balance (6) is configured to weigh a coal sample of a predetermined weight so that the coal sample enters the first heating furnace (1); and The second thermal balance (8) is configured to weigh the dehydrated coal sample after the moisture has evaporated to determine the moisture content in the coal sample, and / or weigh the ash after the volatile matter has evaporated and the sulfur, carbon and hydrogen components have reacted to determine the ash content.

9. The coal quality analysis system according to claim 8, characterized in that, The sample introduction component (5) also includes: Third branch road (53); The first sampling unit (54) is configured to allow a coal sample from the first thermal balance (6) to enter the first heating furnace (1) via the third branch (53) through pulsed air intake; and The second sampling unit (55) is configured to allow the dehydrated coal sample in the second thermal balance (8) to enter the second heating furnace (1') through the third branch (53) by pulsed air intake.

10. The coal quality analysis system according to claim 8, characterized in that, The sample introduction component (5) also includes: Third branch road (53); A first valve (51), located on the third branch (53), is configured to, when open, connect the third branch (53) to allow a coal sample to enter the first heater (1) or the second heater (1'); and The second cooler (52), located on the third branch (53) and downstream of the first valve (51), is configured to reduce the coal sample to a preset temperature.

11. The coal quality analysis system according to claim 8, characterized in that, The sample introduction component (5) also includes: The first suction component (7) is configured to remove dust from the first thermal balance (6); and / or The second suction component (9) is configured to remove dust from the second thermal balance (8).

12. The coal quality analysis system according to claim 1, characterized in that, The gas supply assembly (2) also includes: The fourth branch (28) has its first end selectively connected to the nitrogen source (21) or the oxygen source (22), and its second end selectively connected to the air inlet (11) of the first heating furnace (1) or the second heating furnace (1'). A throttle valve (23), located on the fourth branch (28), is configured to adjust the gas flow rate; A pressure reducing valve (24), located on the fourth branch (28) and downstream of the throttle valve (23), is configured to reduce gas pressure; A pressure regulating valve (25), located on the fourth branch (28) and downstream of the pressure reducing valve (24), is configured to keep the gas pressure value stable; A one-way valve (26), located on the fourth branch (28) and downstream of the pressure regulator (25), is configured to allow gas to flow only from the nitrogen source (21) to the first furnace (1), or from the oxygen source (22) to the second furnace (1'); and An on / off valve (27), located on the fourth branch (28) and downstream of the one-way valve (26), is configured to control the on / off state of the fourth branch (28).

13. The coal quality analysis system according to claim 1, characterized in that, The first heating furnace (1) is configured to heat the coal sample at a first preset temperature to evaporate the moisture; the second heating furnace (1') is configured to heat the dehydrated coal sample at a second preset temperature to completely evaporate the volatile matter, and continue to heat the coal sample at the temperature corresponding to the third preset temperature range to completely react the sulfur, carbon and hydrogen components, and finally form ash. Wherein, the second preset temperature is higher than the first preset temperature, and the lowest point of the third preset temperature range is higher than the second preset temperature.

14. An analytical method based on the coal quality analysis system according to any one of claims 1 to 13, characterized in that, include: Nitrogen gas is supplied to the first heating furnace (1) through the nitrogen gas source (21); Oxygen is supplied to the second heating furnace (1') through the oxygen source (22); The coal sample is heated by the first heating furnace (1) to evaporate the moisture in the coal sample; The coal sample dehydrated by the first heating furnace (1) is heated by the second heating furnace (1') so that the volatile matter in the coal sample volatilizes and the sulfur, carbon and hydrogen components react. The analytical component (36) measures the content of volatiles in the gas discharged from the exhaust port (13) of the second heating furnace (1') and determines the content of the corresponding components based on the reaction products of sulfur, carbon and hydrogen components.

15. The analytical method according to claim 14, characterized in that, Also includes: The nitrogen gas inside the first furnace (1) is circulated during operation by the gas circulation assembly (4), and / or the oxygen gas inside the second furnace (1') is circulated during operation.

16. The analytical method according to claim 15, characterized in that, The first end of the first branch (34) can be selectively connected to the exhaust port (13) of the first heating furnace (1) or the second heating furnace (1'). The gas circulation assembly (4) includes: a second branch (44) and a pump (41). The gas analysis assembly (3) further includes: a first reversing valve (33) disposed on the first branch (34) and having a first state and a second state. The circulation of nitrogen gas inside the first heating furnace (1) during operation via the gas circulation assembly (4) includes: Connect the first end of the first branch (34) to the exhaust port (13) of the first heating furnace (1); The first reversing valve (33) is placed in the second state so that the inlet of the pump (41) is connected to the outlet (13) of the first heating furnace (1), thereby supplying nitrogen gas discharged from the first heating furnace (1) to the circulation port (15) through a portion of the first branch (34) and the second branch (44); or The circulation of oxygen within the second heater (1') during operation via the gas circulation assembly (4) includes: Connect the first end of the first branch (34) to the exhaust port (13) of the second heating furnace (1'); The first reversing valve (33) is put into the second state so that the air inlet of the pump (41) is connected to the exhaust port (13) of the second heating furnace (1') so that the gas discharged from the second heating furnace (1') is supplied to the circulation port (15) through a section of the first branch (34) and the second branch (44).

17. The analytical method according to claim 14, characterized in that, The coal quality analysis system further includes a gas circulation assembly (4), a backflushing gas source (46), and a sample introduction component (5). The sample introduction component (5) includes a third branch (53) configured to introduce the coal sample into the first heating furnace (1) or the second heating furnace (1'). The gas circulation assembly (4) includes a second branch (44) and a pump (41). The analysis method further includes: After the coal sample has been heated and discharged, the inlet of the pump (41) is connected to the backflush gas source (46) so as to provide backflush gas to at least one of the backflush port (14) of the first heating furnace (1) or the second heating furnace (1') and the third branch (53) through the second branch (44) to achieve purging.

18. The analytical method according to claim 14, characterized in that, The gas analysis component (3) further includes: a first cooler (31) and a calorimeter (32) both installed on the first branch (34), and the analysis method further includes: When it is necessary to analyze the gas composition, the first cooler (31) is turned on and the calorimeter (32) is turned off to cool the gas discharged from the exhaust port (13) of the second heating furnace (1'). When it is necessary to measure the heat of combustion of a coal sample, the calorimeter (32) is turned on and the first cooler (31) is turned off to measure the heat of combustion of the coal sample.

19. The analytical method according to claim 14, characterized in that, Also includes: Before heating the coal sample through the first heating furnace (1), the coal sample of a preset weight is weighed through the first thermal balance (6), and the coal sample is put into the first heating furnace (1) through pulse air intake. After the moisture in the coal sample has completely evaporated, the coal sample is discharged to the second thermal balance (8) to weigh the dehydrated coal sample. The moisture content in the coal sample is determined based on the preset weight and the weight of the dehydrated coal sample.

20. The analytical method according to claim 19, characterized in that, Also includes: After the volatile matter has volatilized and the sulfur, carbon and hydrogen components have reacted, the coal sample is discharged to the second thermal balance (8) to weigh the ash content to determine the ash content; or The ash content is determined based on the preset weight, sulfur content, carbon content, and hydrogen content.

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