Method for on-line detection of solid fuel thermal reaction gas product

Abstract

The invention discloses a method for on-line detection of a solid fuel thermal reaction gas product. The method comprises the following steps: S1, a trace feeder continuously and stably provides dry and loose solid fuel particles into a high-temperature reaction furnace at a rate of 0.5 g / min to 2g / min; s2, mixed gas of nitrogen and oxygen is introduced into the high-temperature reaction furnace through a gas inlet to serve as carrier gas, and solid fuel is combusted; s3, gas generated by combustion in S2 is filtered and introduced into a gas detection unit, gas entering a flue gas analyzer is subjected to synchronous measurement and in-situ sampling detection in the combustion process, waste gas is monitored in real time, and the waste gas comprises one or more of NOx, CO, CO2 and SO2 pollutants; by continuously and stably supplying the coal micro powder, synchronous measurement and in-situ sampling of pollutants such as VOCs, NOx, CO and SO2 in a wide temperature range are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas detection, in particular to a method for online detection of solid fuel thermal reaction gas products. BACKGROUND

[0002] In recent years, China has vigorously promoted the concept of low-carbon and environmentally friendly operation of industry. Coal, due to its large-molecular network structure and complex composition, will produce a series of pollution gases such as CO2, VOCs and NO X , VOCs and NO X are the atmospheric pollutants that are monitored and controlled in China, and are also important intermediates and products of fuel combustion / pyrolysis process. Achieving accurate measurement of VOCs and NOX in a wide temperature range is an important basis for pollution emission control and improving the level of combustion / pyrolysis technology. Currently, fine measurement of VOCs is commonly used in precise drug delivery in the medical field, environmental monitoring and indoor air quality detection, and the measurement is mainly aimed at substances such as acetone, n-pentane, isopentane, benzene, toluene, furan, and propylene aldehyde. There is a lack of detection means for C2-C12 multi-type VOCs of fuel combustion emissions, and it cannot meet the measurement requirements of wide temperature range in field detection and experimental research. Chromatography and mass spectrometry are common methods for VOCs measurement, and the time resolution of accurate measurement is generally more than 30 minutes. The accuracy of online measurement and metering process is poor due to limitations of technical devices and standard gases. The accurate measurement and metering of VOCs and NOX in a wide temperature range still have technical bottlenecks in sample pretreatment, separation and detection, and it is urgent to develop a systematic measurement solution.

[0003] To meet the detection requirements of new environmental protection and deep energy-saving technology development in the field of typical solid combustion equipment, improve the detection accuracy of key pollutants of energy efficiency emissions, the present application focuses on designing high-accuracy online measurement technology of VOCs and NOx in a wide temperature range, and high-accuracy online measurement technology of NOx, SO2 and CO2 in high-humidity flue gas. The high-accuracy VOCs and NOX detection technology can provide technical support for VOCs and NO X detection in traditional energy-using industries, emerging manufacturing industries and transportation related fields. The designed flue gas component detection device can solve the important technical problems of industrial field flue gas measurement. SUMMARY

[0004] The present application aims to provide a method for online detection of solid fuel thermal reaction gas products. The present application realizes synchronous measurement and in-situ sampling of VOCs and NOx, CO, SO2 and other pollutants in a wide temperature range, and synchronous control of carrier gas concentration and flow rate by continuously and stably supplying coal fines.

[0005] To solve the technical problem, the technical scheme of the present application is: a method for online detection of solid fuel thermal reaction gas products, comprising the following steps: S1, a trace feeder for drying solid fuel by using microwaves is arranged above a high-temperature reaction furnace, and the trace feeder continuously and stably provides dry and loose solid fuel particles into the high-temperature reaction furnace at a rate Q of 0.5 g / min to 2 g / min; S2, a mixture of nitrogen and oxygen is introduced into the high-temperature reaction furnace through an air inlet as a carrier gas, and the high-temperature reaction furnace is heated by a silicon-molybdenum rod, and the solid fuel is burned in the high-temperature furnace; S3, the gas produced by the combustion in S2 is filtered into a gas detection unit, and the gas entering the flue gas analyzer is measured and sampled in situ to monitor the waste gas in real time during the combustion process, wherein the waste gas comprises one or more of NO x , CO, CO2, SO2 pollutants.

[0006] Preferably, the method for continuously feeding the trace feeder at a rate of 0.5 g / min to 2 g / min comprises the following steps: S11, the microparticle solid fuel is placed in a storage bin, and a stirring rod and a spiral feeding part are sequentially arranged in the storage bin from top to bottom, wherein the spiral feeding part is located at the center position of the vertically arranged pipeline connected to the lower end of the storage bin, and the pipeline corresponds to the center position of the rotating horizontal disc; the stirring rod and the spiral feeding part driven by a driving motor keep turning and output the coal powder in the storage bin; Meanwhile, the storage bin is also provided with a microwave heating unit to heat and dry the coal powder in the storage bin; The water molecules in the coal powder particles are separated from the microparticle solid fuel under the action of microwave heating, and the water vapor moves upward and separates from the storage bin as the microparticle solid fuel is continuously turned over; S12, the microparticle solid fuel pile at the center position of the disc is uniformly dispersed into a thin layer in the circumferential direction under the action of centrifugal force as the disc rotates, and then scraped into the feeding inlet of the high-temperature reaction furnace by a scraper; The rate at which the scraper sends the microparticle solid fuel on the disc into the feeding inlet is Q, ; Wherein, is the effective feeding area; R is the radius of the disc; ρ is the bulk density of the material; k is the average bulk thickness of the material; L is the actual length of the scraper; n is the rotating speed of the disc; is the effective action width of the scraper; .

[0007] The present application overcomes the mutual adhesion and aggregation of the fuel particles into larger lumps due to the electrostatic force and Van der Waals force between the particles by increasing the gap between the particles, reduces the agglomeration of the fuel, and effectively ensures the stability of the continuous feeding by the relative fixed position and the fixed area swept between the scraper and the disc through the control of the dryness of the fuel particles and the dispersion of the material by stirring and centrifugal force during the transfer process.

[0008] Preferably, the radius R of the disc is 30 mm, the rotating speed n of the disc is 10 rpm to 180 rpm, and the rotating speed V of the stirring rod and the spiral discharging element in S11 is 0.36 rpm≤V≤5.6 rpm. The present application cooperates the disc rotation with the stirring rod and the spiral discharging element to stabilize the fuel thickness and ensure the feeding stability.

[0009] Preferably, the micron particle solid fuel in the storage bin in S11 is heated by microwaves to maintain the temperature in the storage bin at 95℃ to 105℃; and the top of the storage bin is covered with a cover plate. The upper portion of the storage bin is further provided with a gas outlet hole for water vapor discharge. The included angle between the scraper and the disc is θ, wherein 30°≤θ≤60°.

[0010] Preferably, the storage bin is made of polypropylene. The material of the discharge bin of the present application is suitable for microwave heating.

[0011] Preferably, when the real-time concentration of the exhaust gas in the flue gas analyzer is stable, the valve before the gas chromatograph is opened and the sample injection program of the six-way valve of the gas chromatograph is started; The HP-5MS column with the specification of 30mm×25mm×25mm is used in the gas chromatograph, the outlet of the chromatographic column is connected with the MSD mass spectrometer detector, the column oven temperature in the gas chromatograph is set to 35℃ and maintained for 5 mins, and then heated to 180℃ at the rate of 5℃ / min; Maintained at 180℃ for 5 mins; Heated to 250℃ at the rate of 10℃ / min; The obtained mass spectrum is searched by INST Pu Ku to determine the generated gas components.

[0012] The present application realizes the determination of the gas components of the solid fuel thermal reaction gas product through the above steps.

[0013] Preferably, for the case that the VOCs concentration is low after the combustion of the solid fuel, the method for detecting VOCs is as follows: S21, using a temperature controller to control the temperature in the furnace to 500℃ at a heating rate of 5℃ / min, after the temperature is stable for three minutes, first pass the carrier gas, then open the second valve, the third valve, the fifth valve, close the first valve and the fourth valve, the gas enters the flue gas analyzer after passing through the adsorption tube, after stable combustion for 20min, close the feed, and record the usage of biomass fuel; S22, close the second valve, the first valve and the fifth valve, open the third valve and the fourth valve, the surface of the adsorption tube is provided with a heating belt to heat the adsorption tube for desorption, after heating, nitrogen is introduced for purging until the infrared spectrum appears stable absorption peak, then open the gas chromatography valve and start the gas chromatography sampling six-way valve sampling program, and then perform gas chromatography detection.

[0014] Preferably, the high-temperature reaction furnace is provided with a cooling system, the cooling system comprises a cooling water pump, a cooling water tank and a cooling water pipeline, cooling water in the cooling water tank is introduced into both ends of the high-temperature reaction furnace through the cooling water supply pipeline by the cooling water pump, the cooling water absorbs heat at both ends of the high-temperature reaction furnace, and then returns to the cooling water tank through the cooling water return pipeline to complete the cooling cycle, so that the temperature at both ends of the high-temperature reaction furnace does not exceed 100℃.

[0015] Preferably, the carrier gas in S2 comprises 79% nitrogen and 21% oxygen.

[0016] By adopting the above technical scheme, the present application has the following beneficial effects: The present application uses a micro-feeding machine to continuously and stably provide dry and loose solid fuel particles into the high-temperature reaction furnace at a rate Q of 0.5g / min to 2g / min, then controls the carrier gas to ensure stable combustion in the high-temperature furnace, and then filters the gas generated by S2 combustion and introduced into the gas detection unit, and simultaneously measures and in-situ samples the gas entering the flue gas analyzer to monitor the exhaust gas in real time during the combustion process. The present application can realize in-situ sampling and simultaneous measurement of VOCs and NO x , CO, SO2 and other pollutants in a wide temperature range of 273K-1700K. The present application further stabilizes and accurately measures low-concentration VOCs in the flue gas by controlling the continuous micro-feeding rate of the solid fuel, the concentration and flow of the carrier gas, and the high-accuracy online measurement. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The figure is a schematic diagram of the device for implementing the method of the present application for online monitoring of the gas products of the thermal reaction of solid fuel; Figure 2 It is a schematic diagram of the continuous micro-feeding of the micro-feeding machine in the present application; Figure 3 It is a perspective view of the micro-feeding machine in the present application; Figure 4 It is a feeding stability curve of the micro-feeding machine in the present application; Figure 5 is the online monitoring of the concentration of reaction gas using a flue gas analyzer in the embodiment 4 of the present application; Figure 6 is the gas chromatogram of the solid fuel thermal reaction gas product in the embodiment 5 of the present application; Figure 7 is the mass spectrum obtained by the INST Pku search according to Figure 6 the gas component produced is determined by the INST Pku search according to the mass spectrum obtained; Figure 8 is the online monitoring of the concentration of reaction gas using a flue gas analyzer in the comparative example; Reference signs: storage bin 1; pipeline 2; driving motor 3; disc 4; magnetic suspension motor 5; stirring rod 6; spiral down feeder 7; scraper 8; discharge port 9; microwave heating unit 10; exhaust hole 11; cover plate 12. DETAILED DESCRIPTION

[0018] In order to further explain the technical solutions of the present application, the present application will be described in detail below through specific embodiments.

[0019] Embodiment 1

[0020] The present embodiment discloses a method for continuously supplying trace fuel applied to a laboratory reactor, and a device for implementing the method is shown in Figure 1 and Figure 2 , which comprises the following steps: S1, micron particle solid fuel is placed in a storage bin 1, and a stirring rod 6 and a spiral down feeder 7 are sequentially arranged in the storage bin 1 from top to bottom, wherein the spiral down feeder 7 is located in a pipeline 2 communicated with the lower end of the storage bin 1, and the pipeline 2 corresponds to the center position of a rotating disc 4; the stirring rod 6 and the spiral down feeder 7 driven by a driving motor 3 keep turning and output the coal powder in the storage bin 1; Meanwhile, the storage bin 1 is also provided with a microwave heating unit 10 for heating and drying the coal powder in the storage bin 1; The water molecules in the coal powder particles are separated from the micron particle solid fuel particles in the form of steam under the action of microwave heating, and with the continuous turning of the micron particle solid fuel, the water vapor moves upward and separates from the storage bin after being separated from the coal powder; S2, the micron particle solid fuel pile at the center position of the disc 4 is uniformly dispersed into a thin layer in the circumferential direction under the action of centrifugal force with the rotation of the disc 4, and then scraped into the inlet of the laboratory reactor by a scraper 8.

[0021] The rate at which the scraper sends the micron particle solid fuel on the disc into the inlet in the present embodiment is Q, ; wherein, For effective feeding area; R is the radius of the disc, unit mm; ρ is the bulk density of the material, g / cm 3 ; k is the average bulk thickness of the material in the range of the scraper, mm; L is the actual length of the scraper, mm; n is the rotating speed of the disc, rpm; L*sinθ is the effective width of the scraper; .

[0022] The discharging amount Q of the present application is introduced As a correction factor, the influence of centrifugal force on the material layer is quantified; the above process parameters are specifically shown in Table 1.

[0023] The length of the scraper and the inclination angle relative to the rotating disc are matched with the bulk density and thickness of the material in the present application, so as to effectively and accurately control Q, and obtain accurate and continuous micro fuel supply.

[0024] The rate Q at which the micron particle solid fuel is fed into the inlet in the present embodiment is shown in Table 1. The present application ensures the stability of the material during the feeding process by synchronously controlling the particle size of the solid fuel particles and the real-time drying degree, so as to stably discharge under the joint action of the disc and the scraper.

[0025] The radius R of the disc in the present embodiment is 60 mm, the rotating speed n of the disc is shown in Table 1, and the rotating speed V of the stirring rod and the screw discharging part in S1 is shown in Table 1. The rotating speed of the screw discharging part in the present application is mainly to match the rotating speed of the disc and control the stability of Q.

[0026] The micron particle solid fuel in the storage bin in S1 in the present embodiment is heated by microwaves to maintain the temperature in the storage bin at 100℃, and the moisture content of the micron particle solid fuel is less than 0.5%. The present application stabilizes the drying temperature to ensure effective evaporation of water, and the viscosity of the fuel particles is effectively controlled on the premise of uniform particle size, so as to adapt to the dispersion of the disc and the cooperation of the scraper and the disc, and realize continuous supply of micro fuel.

[0027] The top of the storage bin in the present embodiment is covered with a cover plate; the upper part of the storage bin is further provided with a gas outlet hole for water vapor discharge.

[0028] The inner diameter of the pipeline in the present embodiment is 1 cm.

[0029] The storage bin is made of polypropylene. The storage bin made of polypropylene is suitable for microwave heating in the present application.

[0030] The whole fixing device is fixed on the pipe furnace or the required feeding port by screws, the feeding port and the storage bin are placed on the fixing device, and the feeding machine outlet pipe is fixed by the fixing support. The driving motor is fixed above the storage bin by the L-shaped fixing support, the screw feeder is inserted into the outlet pipe, and the height is adjusted to the appropriate height.

[0031] In the working process, first, the pulverized coal is added into the storage bin 1, the power is turned on, the driving motor 3 of the screw 2 and the magnetic suspension motor 5 for driving the disc 4 to rotate can be controlled respectively, the storage bin 1 is made of high-transmission-wave polypropylene and can transmit microwaves, the fuel particles in the storage bin 1 can be heated by microwaves before formal feeding to remove the moisture of the sample in the storage bin 1, the temperature sensor is arranged in the storage bin 1 to feed back the temperature change in the bin in real time, the temperature in the bin is fed back to the microwave heating unit 10, the microwave heating unit 10 adjusts the heating power in real time through the temperature signal of the thermocouple, so that the fuel in the storage bin 1 can be dried at about 100 DEG C, the exhaust hole 11 is arranged in the storage bin 1, and the water vapor during drying flows out through the exhaust hole 11. When formal feeding, the driving motor 3 and the magnetic suspension motor 5 of the stirring rod 6 and the screw feeder 7 are controlled by stepless speed regulation respectively, so that the disc 4 and the screw feeder 7 rotate at a certain rate, the upper half of the screw feeder is provided with the stirring rod 6, and the pulverized coal in the storage bin 1 is stirred. The end of the stirring rod 6 is provided with a thermocouple for monitoring the temperature of the material in the bin in real time, and the pulverized coal in the hopper is continuously stirred during the rotation and drying process to prevent the pulverized coal from caking or sticking. The screw feeder 7 rotates to continuously transport and guide the pulverized coal downward, and the pulverized coal is transported to the center of the disc 4 through the pipeline 2. The disc is driven to rotate by the magnetic suspension motor, the electromagnetic force is adjusted in real time by using active magnetic suspension control, the speed change of the rotor is accurately controlled, the accurate control of the speed of the rotor can accurately control the feeding speed of the feeder, the rotor is suspended by electromagnetic force, which can completely eliminate the friction loss of the mechanical bearing and is suitable for long-time work. The rotation of the disc makes the coal powder in the center of the disc fall into the coal powder under the action of centrifugal force, and the coal powder in the center of the disc moves to the edge, and finally the coal powder is scraped into the outlet 9 by the scraper 8 at the edge, the feeding is continuous and stable, and the pulverized coal can be uniformly dropped into the experimental reactor.

[0032] Example 2

[0033] The main difference between this example and example 1 is shown in table 1 and table 2.

[0034] Example 3

[0035] The main difference between this example and example 1 is shown in table 1 and table 2.

[0036] Table 1: parameters of solid fuel particles in examples 1 to 3 and comparative examples

[0037] Table 2. Parameter control and feeding rate of the disc and scraper in Examples 1 to 3 and the comparative examples.

[0038] This invention effectively controls the flowability of fuel powder particles through drying, and, combined with the centrifugal effect of the fuel powder on the rotating surface, stabilizes the thickness of the scraper coverage area, thus ensuring a stable fuel supply. The most common flow deterioration phenomenon is fuel particle agglomeration causing feeding instability; severe particle agglomeration can even lead to pipeline blockage. The flow factors in powder feeding devices are complex, currently focusing mainly on the powder's own physical properties, namely, that coal powder flow is caused by multiple factors such as coal powder particle size, shape, surface structure, and moisture content. Generally, as the coal powder particle size gradually decreases, it exhibits increasingly stronger viscosity, and adhesion and agglomeration become more severe. This invention designs the feeding rate to be between 0.5 g / min and 2 g / min. To avoid agglomeration in the hopper and the formation of clumps and adhesions, the mechanical dispersion principle is utilized, employing spiral stirring and microwave drying technology within the hopper to ensure that the sample in the hopper is in a real-time dry state. The coal powder accumulated at the bottom of the storage hopper is continuously agitated, and the coal powder at the bottom of the hopper is evenly fed into the feeding trough. Due to the low feed rate, to reduce feed fluctuations caused by uneven coal powder distribution, the actual pipeline channel is very narrow, approximately 1 cm, with the discharge opening located near the center of the disc, and the hopper is a perforated type with a capacity of 4 liters. This feeding method minimizes the adhesive effect between the coal powder contact surfaces, improving the continuity of feeding. The coal powder is continuously fed by this invention, propelling it out of the discharge port and subsequently carried into the furnace by the gas.

[0039] Example 4 This embodiment discloses a method for online detection of gaseous products from the thermal reaction of solid fuels, comprising the following steps: S1. A micro feeder for drying solid fuel using microwave heating is installed above the high-temperature reactor. The micro feeder is adjusted according to the method in Example 1 to continuously and stably supply dry and loose solid fuel particles into the high-temperature reactor at a rate of 1 g / min. S2. Use a temperature controller to control the furnace temperature at a heating rate of 5℃ / min, and heat it to 600℃. After the temperature stabilizes for three minutes, first introduce the carrier gas. The carrier gas in S2 consists of 79% nitrogen and 21% oxygen.

[0040] S3. Subsequently, open the second, first, and fifth valves at the outlet, and close the third and fourth valves. The gas path bypasses the adsorption tube, infrared spectroscopy, and gas chromatography, directly reaching the gas analyzer. Start the feeder; pulverized coal falls into the reactor for combustion. After combustion, the ash falls to the bottom, and the resulting flue gas, after filtration, enters the flue gas analyzer for detection. For details on exhaust gas concentration, please refer to [link to relevant documentation]. Figure 5 As shown.

[0041] Example 5 This example discloses a method for on-line detection of solid fuel thermal reaction gas products, comprising the following steps: S1, a micro-feeding machine for drying solid fuel using microwave heating is provided above the high-temperature reaction furnace, and the micro-feeding machine is adjusted to continuously and stably provide dry and loose solid fuel particles into the high-temperature reaction furnace at a rate of 1 g / min according to the method of Example 1; S2, a mixed gas of 79% nitrogen and 21% oxygen is used as the carrier gas. The temperature controller is used to control the temperature in the furnace to increase the temperature to 600℃ at a heating rate of 5℃ / min, and after the temperature is stable for three minutes, the carrier gas is first passed; S3, then the second valve, the first valve, the fourth valve, and the fifth valve are opened, the third valve and the valve before the gas chromatograph sampling port are closed, when the gas concentration in the gas analyzer is relatively stable, the valve before the gas chromatograph is opened and the gas chromatograph sampling six-way valve sampling program is started. The column used in the gas chromatograph is HP-5MS (30mmx25mmx25mm), the outlet of the chromatographic column is connected to the MSD mass spectrometer detector, the column oven temperature in the gas chromatograph is set to 35℃, and the temperature is maintained for 5 mins, then heated to 180℃ at a rate of 5℃ / min, maintained at 180℃ for 5 mins, then heated to 250℃ at a rate of 10℃ / min. The obtained mass spectrum is searched by INST Pu Ku, and the generated gas components are determined, as shown in Figure 6 and Figure 7 .

[0042] Example 6 This example discloses a method for on-line detection of solid fuel thermal reaction gas products, comprising the following steps: S1, a micro-feeding machine for drying solid fuel using microwave heating is provided above the high-temperature reaction furnace, and the micro-feeding machine is adjusted to continuously and stably provide dry and loose solid fuel particles into the high-temperature reaction furnace at a rate of 1 g / min according to the method of Example 1; S2, a mixed gas of 79% nitrogen and 21% oxygen is used as the carrier gas. The temperature controller is used to control the temperature in the furnace to increase the temperature to 600℃ at a heating rate of 5℃ / min, and after the temperature is stable for three minutes, the carrier gas is first passed; S3, then the second valve, the first valve, the fourth valve, and the fifth valve are opened, the third valve and the valve before the gas chromatograph sampling port are closed, when the gas concentration in the gas analyzer is relatively stable, the valve before the gas chromatograph is opened and the gas chromatograph sampling six-way valve sampling program is started. The column used in the gas chromatograph is HP-5MS (30mmx25mmx25mm), the outlet of the chromatographic column is connected to the MSD mass spectrometer detector, the column oven temperature in the gas chromatograph is set to 35℃, and the temperature is maintained for 5 mins, then heated to 180℃ at a rate of 5℃ / min, maintained at 180℃ for 5 mins, then heated to 250℃ at a rate of 10℃ / min. The obtained mass spectrum is searched by INST Pu Ku, and the generated gas components are determined, as shown in

[0043] The peak in the gas chromatograph is small when the VOCs concentration is low after solid fuel combustion, and it is difficult to qualitatively and quantitatively determine it. Therefore, it is necessary to enrich it through an adsorption tube, and then desorb it and pass it into the chromatograph and infrared spectrum.

[0044] Comparative example The present comparative example discloses a method for on-line detection of solid fuel thermal reaction gas products, comprising the following steps: The main difference between the present comparative example and example 4 is that the micro-feeding machine is not provided with microwave drying. According to the process parameters of example 4, an on-line flue gas analyzer is used for detection, and the waste gas concentration is shown in Table 1. Figure 8

[0045] Comparing the comparative example with example 4, it can be seen that the solid fuel without microwave drying in the comparative example is difficult to realize stable feeding even through centrifugal dispersion, and it is difficult to control the carrier gas to ensure stable combustion in the high-temperature furnace. Then, the gas produced by combustion is filtered through S2, and is passed into the gas detection unit. The pollutants such as VOCs and NO x , CO, SO2, etc. in the gas entering the flue gas analyzer are measured in real time during the combustion process, and the waste gas is detected by on-site sampling. The present application can realize the synchronous measurement and on-site sampling of VOCs and NO x , CO, SO2, etc. pollutants in a wide temperature range of 273K-1700K, and the synchronous control of carrier gas concentration and flow rate, and high-accuracy on-line measurement.​

Claims

1. A method for online detection of gaseous products from the thermal reaction of solid fuels, characterized in that: Includes the following steps: S1. A micro feeder for drying solid fuel using microwave heating is installed above the high-temperature reactor. The micro feeder continuously and stably supplies dry and loose solid fuel particles into the high-temperature reactor at a rate Q of 0.5 g / min to 2 g / min. S2. A mixture of nitrogen and oxygen is introduced into the high-temperature reactor through the air inlet as a carrier gas. The high-temperature reactor is heated by a silicon molybdenum rod, and the solid fuel is burned in the high-temperature furnace. S3. The gas produced by the combustion of S2 is introduced into the gas detection unit. During the combustion process, the composition and concentration of the exhaust gas are monitored in real time through simultaneous measurement and in-situ sampling. The exhaust gas includes NO. x One or more of the following pollutants: CO, CO2, and SO2.

2. The method for online detection of gaseous products from the thermal reaction of solid fuels according to claim 1, characterized in that: The method for continuous feeding with a micro-feeder at a rate of 0.5 g / min to 2 g / min includes the following steps: S11. Micron-sized solid fuel particles are placed in a storage bin. A stirring rod and a screw feeder are arranged from top to bottom in the storage bin. The screw feeder is located in a vertically arranged pipe connected to the lower end of the storage bin. The pipe corresponds to the center position of a rotating horizontal disc. The stirring rod and screw feeder, driven by a drive motor, keep turning and output the coal powder in the storage bin. Meanwhile, the storage silo is also equipped with a microwave heating unit to heat and dry the coal powder inside the storage silo; Water molecules in pulverized coal particles form steam under microwave heating and detach from the micron-sized solid fuel particles. As the micron-sized solid fuel particles are continuously tumbled, the water vapor moves upward and detaches from the storage bin. S12. The micron-sized solid fuel particles located at the center of the disk are evenly dispersed into a thin layer from the center of the disk towards the circumference under the action of centrifugal force as the disk rotates, and then scraped into the feed port of the high-temperature reactor by a scraper. The scraper feeds the micron-sized solid fuel particles from the disk into the feed inlet at a rate of Q. ； in, For effective feeding area; R is the radius of the disk; ρ is the bulk density of the material; k is the average stacking thickness of the material; L is the actual length of the scraper; n is the rotational speed of the disk; This refers to the effective working width of the scraper; 。 3. The method for online detection of gaseous products from the thermal reaction of solid fuels according to claim 3, characterized in that: The radius R of the disc is 30mm, the disc rotation speed n is 10rpm to 180rpm, and the rotation speed V of the stirring rod and the spiral feeder in S11 is 0.36rpm≤V≤5.6rpm.

4. The method for online detection of gaseous products from the thermal reaction of solid fuels according to claim 2, characterized in that: In step S11, the micron-sized solid fuel particles in the storage bin are heated by microwave to maintain the temperature inside the storage bin at 95°C to 105°C; the top of the storage bin is covered with a cover plate. The upper part of the storage silo is also provided with a vent for water vapor to be discharged; The angle between the scraper and the disc is θ, where 30°≤θ≤60°.

5. The method for online detection of gaseous products from the thermal reaction of solid fuels according to claim 2, characterized in that: The storage silo is made of polypropylene.

6. The method for online detection of gaseous products from the thermal reaction of solid fuels according to claim 1, characterized in that: When the real-time concentration of exhaust gas in the flue gas analyzer is stable, open the gas chromatograph pre-valve and start the gas chromatograph injection six-way valve injection program. The resulting gaseous components were determined by searching the INST library based on the obtained mass spectrum.

7. The method for online detection of gaseous products from the thermal reaction of solid fuels according to claim 7, characterized in that: For cases where VOC concentrations are low after solid fuel combustion, the following methods can be used to detect VOCs: S21. Use a temperature controller to control the temperature rise in the furnace. After the temperature stabilizes, first introduce carrier gas, then open the second, third, and fifth valves, and close the first and fourth valves. The gas passes through the adsorption tube and then enters the flue gas analyzer. After stable combustion, turn off the feed and record the amount of biomass fuel used. S22. Close the second, first, and fifth valves, and open the third and fourth valves. The adsorption tube surface is equipped with a heating belt to heat the adsorption tube for desorption. After heating, nitrogen gas is introduced to purge to the infrared spectrum. When a stable absorption peak appears in the infrared spectrum, open the gas chromatography pre-valve and start the gas chromatography injection six-way valve injection program to perform gas chromatography detection.

8. The method for online detection of gaseous products from the thermal reaction of solid fuels according to claim 1, characterized in that: A cooling system is provided around the high-temperature reactor. The cooling system consists of a cooling water pump, a cooling water tank, and cooling water pipelines. The cooling water pump supplies cooling water from the cooling water tank to both ends of the high-temperature reactor through the cooling water supply pipes. The cooling water absorbs the heat from both ends of the high-temperature reactor and then returns to the cooling water tank through the cooling water loop to complete the cooling cycle, so that the temperature at both ends of the high-temperature reactor does not exceed 100°C.

9. The method for online detection of gaseous products from the thermal reaction of solid fuels according to claim 1, characterized in that: The carrier gas in S2 consists of 79% nitrogen and 21% oxygen.

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