Real-time online sampling method for pulverized coal of pulverized coal gasification furnace

Abstract

The invention relates to the technical field of pulverized coal gasification, and discloses a real-time online sampling method for pulverized coal of a pulverized coal gasifier. The method comprises the following steps: (1) mixing pulverized coal from a pulverized coal feeding tank (1) and speed regulation gas introduced through a speed regulation gas pipeline (17) in a pulverized coal pipeline (7) to obtain a mixed material; (2) conveying the mixed material into the pressure reducing pipe (14) to reduce the pressure of the mixed material to target pressure, and then conveying the mixed material into the sampler (11); (3) sampling by the sampling device (15) through the sampling pipeline (13); and (4) after the sampling is completed, returning the residual pulverized coal in the sampler (11) to the pulverized coal feeding tank (1) through the return pipe (16) for recycling. According to the technical scheme, pulverized coal is conveyed through the high-pressure pulverized coal pipeline, and the high-pressure pipeline is decompressed to normal pressure for sampling, so that the operation efficiency of the gasification furnace can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pulverized coal gasification, in particular to a pulverized coal gasification furnace coal powder real-time online sampling method. BACKGROUND

[0002] The dry pulverized coal gasification technology is to prepare raw coal into dry pulverized coal, which is transported to the gasification furnace for oxidation reaction through low-pressure and high-pressure pneumatic conveying. The coal quality characteristics have a great influence on the operation of the gasification furnace. High ash content of coal powder is easy to cause the gasification furnace to be blocked by slag and stop, and the fluctuation of ash content is also easy to cause the fluctuation of the heat loss of the gasification furnace. At present, the coal gasification process generally adopts the method of manual sampling of raw coal and coal fiber separator and laboratory analysis, and the main analysis indexes are ash content, moisture content, sulfur content, calorific value, ash composition, particle size distribution, etc. When the quality of raw coal changes greatly, the coal powder entering the gasification furnace also changes, and the sudden change of coal quality will lead to the fluctuation of the furnace temperature and heat loss of the gasification furnace, and the existing online analysis of synthetic gas has a lag in adjusting the furnace temperature. There is a large error between the analysis results of raw coal and the quality of coal powder, especially for large-scale pulverized coal gasification devices using coal blending, the analysis of raw coal has weak guiding significance for production operation.

[0003] At present, there is no related technology and implementation case for real-time monitoring of high-pressure coal powder quality of the gasification furnace in the industry, and the conventional atmospheric pressure coal powder rapid detection is also in the research stage. The difficulty and risk point of developing real-time detection of high-pressure coal powder lies in that the high-pressure coal powder has a high risk of leakage, which is easy to cause dust explosion, high risk and uncontrollable, resulting in that the high-pressure coal powder system cannot be sampled. Therefore, developing a safe, reliable and operable online sampling method of coal powder of a large-scale pulverized coal gasification furnace to help realize real-time monitoring of coal powder has become a new demand and goal in the field of coal gasification technology, which has important significance for improving the safety and stability of device operation, and the economic benefits are immeasurable. SUMMARY

[0004] The purpose of the present application is to overcome the problems of high risk of high-pressure coal powder leakage in the real-time detection process, easy to cause dust explosion, high risk and uncontrollable, and lag in the monitoring process in the prior art, and provide a pulverized coal gasification furnace coal powder real-time online sampling method. According to the technical scheme of the present application, the coal powder is transported through the high-pressure coal powder pipeline, and the high-pressure pipeline is depressurized to atmospheric pressure for sampling, and the coal quality rapid detection equipment is matched to realize real-time dynamic online operation, the physicochemical parameters of the coal quality can be detected in real time, the ratio of the coal powder and the gasification parameters can be optimized, the operation efficiency of the gasification furnace can be improved, the energy consumption can be reduced, and the production cost can be reduced.

[0005] In order to achieve the above object, the present application provides a method for real-time online sampling of pulverized coal in a pulverized coal gasifier, which is implemented in an online sampling device, the online sampling device comprising a pulverized coal feeding tank, a pulverized coal pipeline, a speed-regulating gas pipeline, a pressure-reducing pipe, a sampler, a sampling pipeline, a sampling device and a backflow pipe, wherein the speed-regulating gas pipeline is connected to the pulverized coal pipeline, the pulverized coal feeding tank, the pulverized coal pipeline, the pressure-reducing pipe and the sampler are connected in sequence, one end of the sampling pipeline is connected to the sampling device and the other end of the sampling pipeline extends into the sampler, and the backflow pipe is arranged at the bottom of the sampler.

[0006] The method comprises the following steps:

[0007] (1) the pulverized coal from the pulverized coal feeding tank is mixed with speed-regulating gas introduced through the speed-regulating gas pipeline in the pulverized coal pipeline to obtain a mixture;

[0008] (2) the mixture is transported into the pressure-reducing pipe to reduce the pressure of the mixture to a target pressure and then transported into the sampler;

[0009] (3) the sampling device samples through the sampling pipeline;

[0010] (4) after sampling, the remaining pulverized coal in the sampler is returned to the pulverized coal feeding tank through the backflow pipe for reuse.

[0011] Preferably, in step (1), the transport pressure of the pulverized coal is 4.5-5.2 MPa.

[0012] Preferably, in step (1), the particle size of the pulverized coal is <500 μm and the density is 150-500 kg / m 3 .

[0013] Preferably, in step (1), the speed-regulating gas is nitrogen and / or carbon dioxide.

[0014] Preferably, in step (1), the flow rate of the speed-regulating gas is 50-150 Nm 3 / h.

[0015] Preferably, in step (2), the target pressure is 1-10 kPa.

[0016] Preferably, in step (2), the length of the pressure-reducing pipe is 1000-3500 mm.

[0017] Preferably, in step (2), the inner diameter of the inlet of the pressure-reducing pipe is 20-30 mm.

[0018] Preferably, in step (2), the inner diameter of the outlet of the pressure-reducing pipe is 50-100 mm.

[0019] Preferably, in step (2), the internal material of the pressure reducing pipe is wear-resistant ceramic.

[0020] Preferably, in step (3), the flow rate of the sampling process is 0.1-0.2 kg / s.

[0021] According to the technical scheme of the present application, coal powder is transported through a high-pressure coal powder pipeline, and sampling is performed after the high-pressure pipeline is depressurized to normal pressure, and a coal quality rapid detection device is matched to realize real-time dynamic online operation, real-time detection of physicochemical parameters of coal quality can be realized, and the ratio of coal powder and vaporization parameters are optimized, the operation efficiency of the gasification furnace is improved, thereby reducing the production cost.

[0022] Compared with the prior art, the technical scheme of the present application has the following advantages:

[0023] (1) The coal powder real-time online sampling method of the present application can realize real-time monitoring of coal powder quality, and has the advantages of safety, stability, strong flexibility and strong operability.

[0024] (2) According to the method of the present application, the analyzed sample can be returned to the coal powder feeding tank for recycling, avoiding sample accumulation.

[0025] (3) The device for implementing the coal powder real-time online sampling method of the present application has the characteristics of easy disassembly and installation, and is convenient for maintenance in the case of abnormal working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The process flow chart of the coal powder real-time online sampling method of the present application.

[0027] REFERENCE NUMERALS

[0028] 1, coal powder feeding tank; 2, fluidizing element; 3, shut-off valve; 4, regulating valve; 5, angle valve; 6, density and velocity meter; 7, coal powder pipeline; 81, first shut-off ball valve; 82, second shut-off ball valve; 91, first pressure relief port; 92, second pressure relief port; 10, diffusion short section; 11, sampler; 12, pressure gauge; 13, sampling pipeline; 14, pressure reducing pipe; 15, sampling device; 16, backflow pipe; 17, speed regulating gas pipeline. DETAILED DESCRIPTION

[0029] The specific embodiments of the present application are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0030] The endpoints of the ranges and any values disclosed herein are not limited to the precise values recited as implicitly disclosed by the language "about." The described ranges may

[0031] In the present application, the meaning of "a plurality of" is two or more. The term "comprising", and any variation thereof, means "including but not limited to", so that an item or items, integers, steps, or components which are "comprised" in the description, claims, or illustrated in a figure may also be either "included but not limited to" or "endorsed by" an item, integer, step, component, etc. specifically recited.

[0032] In addition, the terms indicating the orientation or positional relationship of "up", "down", "top", "bottom", "inner", "outer" and the like are described based on the orientation or relative position relationship shown in the drawings, which is only for the convenience of the simplified description of the present application, and does not indicate that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0033] As shown in Figure 1 The pulverized coal real-time online sampling method of the present application is implemented in the online sampling device, which comprises a pulverized coal feeding tank 1, a fluidizing element 2, a shut-off valve 3, an adjusting valve 4, an angle valve 5, a density and velocity meter 6, a pulverized coal pipeline 7, a first shut-off ball valve 81, a second shut-off ball valve 82, a first pressure relief port 91, a second pressure relief port 92, a diffusion short section 10, a sampler 11, a first pressure gauge 121, a second pressure gauge 122, a sampling pipeline 13, a pressure reduction pipe 14, a sampling device 15, a backflow pipe 16, and a speed-regulating gas pipeline 17.

[0034] The pulverized coal real-time online sampling method of the present application is implemented in the online sampling device, which comprises a pulverized coal feeding tank 1, a fluidizing element 2, a shut-off valve 3, an adjusting valve 4, an angle valve 5, a density and velocity meter 6, a pulverized coal pipeline 7, a first shut-off ball valve 81, a second shut-off ball valve 82, a first pressure relief port 91, a second pressure relief port 92, a diffusion short section 10, a sampler 11, a first pressure gauge 121, a second pressure gauge 122, a sampling pipeline 13, a pressure reduction pipe 14, a sampling device 15, a backflow pipe 16, and a speed-regulating gas pipeline 17.

[0035] (1) The pulverized coal from the pulverized coal feeding tank 1 is mixed with the speed-regulating gas introduced through the speed-regulating gas pipeline 17 in the pulverized coal pipeline 7 to obtain a mixture;

[0036] (2) The mixture is transported into the pressure reduction pipe 14 to reduce the pressure of the mixture to a target pressure, and then transported into the sampler 11;

[0037] (3) The sampling device 15 samples through the sampling pipeline 13;

[0038] (4) After sampling is completed, the remaining pulverized coal in the sampler 11 is returned to the pulverized coal feeding tank 1 through the backflow pipe 16 for reuse.

[0039] In the apparatus described in this invention, the pulverized coal feed tank 1 is used to receive and store pulverized coal from the previous process. The fluidizing element 2 is installed at a reserved port of the pulverized coal feed tank 1 for leading out the pulverized coal. The pulverized coal feed tank 1 and the pressure reducing pipe 14 are connected via a pulverized coal pipeline 7. The shut-off valve 3 is installed at the outlet of the pulverized coal feed tank 1. The shut-off valve 3 is used to cut off the pulverized coal pipeline 7 in case of abnormal operating conditions. The regulating valve 4 is installed on the speed regulating gas pipeline 17. The regulating valve 4 is used to control the flow rate of the speed regulating gas. The angle valve 5 and the density and velocity meter 6 are sequentially installed at the outlet pipeline of the mixture of pulverized coal and speed regulating gas. The speed regulating gas pipeline 17 is connected to the pulverized coal pipeline 7, and the connection point between the speed regulating gas pipeline 17 and the pulverized coal pipeline 7 is between the installation position of the shut-off valve 3 on the pulverized coal pipeline and the installation position of the angle valve 5 on the pulverized coal pipeline 7. The density and velocity meter 6 is used to monitor the density and velocity of the mixture to prevent pipeline blockage. The first shut-off ball valve 81, the first pressure relief port 91, and the pressure gauge 121 are located at the inlet of the pressure reducing pipe 14. The first shut-off ball valve 81 controls the flow rate of the mixture. The pressure gauge 121 monitors the pressure of the mixture at the inlet of the pressure reducing pipe 14. The first pressure relief port 91 adjusts the pressure of the mixture at the inlet of the pressure reducing pipe 14. The pressure reducing pipe 14 is connected to the sampler via the diffuser sub 10. The sampling device 15 is connected to the sampler 11 via the sampling line 13. In a preferred embodiment, the sub of the sampling line 13 is 10 inches, connected by a flange, with a 2-inch sampling port extending internally at a 60-degree angle, and equipped with a sampling ball valve. Sampling can be performed after opening the sampling ball valve. The sampling device 15 can be connected to monitoring equipment and instruments for online monitoring. The second pressure relief port 92 and the second pressure gauge 122 are installed on the sampler 11 and are used to detect and adjust the pressure inside the sampler 11. The reflux pipe 16 is installed at the bottom of the sampler 11 and is used to recover the coal dust contained in the sampler.

[0040] In one specific embodiment, the shut-off valve 3 is opened, and the pulverized coal in the pulverized coal feed tank 1 is led out from the pulverized coal pipeline 7 through the fluidizing special element 2. The regulating valve 4 is opened, and the speed regulating gas is introduced into the pulverized coal pipeline 7 to mix with the pulverized coal to obtain a mixture. The angle valve 5 is opened, and the density and velocity of the mixture are monitored by the density and velocity meter 6. The first shut-off ball valve 81 is opened and adjusted to deliver the mixture to the pressure reducing pipe 14, so that the mixture is depressurized to the target pressure, and then delivered to the sampler 11 through the diffuser stub 10. The second shut-off ball valve 82 is opened, and the mixture is delivered to the sampling device 15 and monitored in real time by a detection instrument. After the real-time monitoring process is completed, the mixture is delivered to the pulverized coal silo 1 for reuse.

[0041] In the method described in this invention, the location of the reserved opening can be set according to actual production needs, for example, it can be arranged by means of technical modification manhole, observation port, point fluidizing gas flange, etc.

[0042] In the method described in this invention, the outer diameter of the pulverized coal pipeline 7 can be 50-100 mm, preferably 55-75 mm, and more preferably 60 mm. The wall thickness of the pulverized coal pipeline 7 can be 5-10 mm, preferably 7-10 mm, and more preferably 9.53 mm.

[0043] In the method described in this invention, preferably, all right-angle bends in the pulverized coal pipeline 7 are made of large-radius 10D elbows. The 10D elbows are used to prevent wear and leakage of the pulverized coal pipeline 7 during operation of the device.

[0044] In the method described in this invention, preferably, the sampler 11 may be provided with an observation port. The observation port may be equipped with a cleaning rotary blade to ensure easy observation. The observation port can be used to determine the state of the high-pressure pulverized coal, which has been depressurized to the target pressure and delivered to the sampler 11. Preferably, a timed purge valve may be provided at the pulverized coal pipeline inlet of the sampler 11 to prevent pipeline blockage.

[0045] In step (1), the conveying pressure of the pulverized coal can be 4.5-5.2 MPa, preferably 4.8-5 MPa.

[0046] In step (1), the particle size of the pulverized coal is <500μm, preferably <400μm; the density of the pulverized coal can be 150-500kg / m³. 3 The preferred value is 200-400 kg / m³. 3 .

[0047] In step (1), the regulating gas can be nitrogen and / or carbon dioxide. In the most preferred embodiment, the regulating gas is nitrogen.

[0048] In step (1), the flow rate of the speed regulating gas can be 50-150 Nm³. 3 / h, preferably 80-120Nm 3 / h.

[0049] In step (2), the target pressure can be 1-10 kPa, preferably 1-5 kPa.

[0050] In step (2), the length of the pressure-reducing tube (14) can be 1000-3500 mm, preferably 1200-3000 mm. The length of the pressure-reducing tube can be adjusted according to the actual usage.

[0051] In step (2), the inlet inner diameter of the pressure reducing tube (14) can be 20-30 mm, preferably 22-25 mm. The outlet inner diameter of the pressure reducing tube (14) can be 50-100 mm, preferably 60-90 mm.

[0052] In step (2), preferably, the internal material of the pressure-reducing tube (14) is wear-resistant ceramic. The wear-resistant ceramic is corundum ceramic obtained by calcining Al2O3 and rare metal oxides. Based on the total weight of the wear-resistant ceramic, the Al2O3 content is 69-99.8% by weight. The wear-resistant ceramic can be prepared according to various conventional methods in this technical field. In one specific embodiment, zirconia particles are embedded in the grain boundaries and grains of alumina using isostatic pressing technology, pressed into a tubular blank, and then the resulting tubular blank is sintered in a high-temperature kiln at 1500-1750°C. The wear-resistant ceramic can be polished to reduce fluid transport resistance.

[0053] In step (3), the sampling flow rate can be 0.1-0.2 kg / s, preferably 0.12-0.18 kg / s.

[0054] The following examples further illustrate the real-time online sampling method for pulverized coal in a pulverized coal gasifier according to the present invention. These examples are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following examples.

[0055] Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods in the art. Unless otherwise specified, the experimental materials used in the following embodiments are commercially available.

[0056] Example 1

[0057] like Figure 1 As shown, the apparatus for real-time online sampling of pulverized coal in a pulverized coal gasifier according to this embodiment includes: a pulverized coal feed tank 1, a fluidizing element 2, a shut-off valve 3, a regulating valve 4, an angle valve 5, a density and velocity meter 6, a pulverized coal pipeline 7, a first shut-off ball valve 81, a second shut-off ball valve 82, a first pressure relief port 91, a second pressure relief port 92, a diffuser subsection 10, a sampler 11, a first pressure gauge 121, a second pressure gauge 122, a sampling pipeline 13, a pressure reducing pipe 14, a sampling device 15, a return pipe 16, and a speed regulating gas pipeline 17. The fluidizing element 2 is located at a reserved opening in the pulverized coal feed tank 1. The pulverized coal feed tank 1 and the pressure reducing pipe 14 are connected via the pulverized coal pipeline 7. The shut-off valve 3 is located at the outlet of the pulverized coal feed tank 1. The regulating valve 4 is located on the inlet pipeline of the speed regulating gas. The angle valve 5 and the density and velocity meter 6 are sequentially located at the outlet pipeline of the mixture of pulverized coal and speed regulating gas. The first shut-off ball valve 81, the first pressure relief port 91, and the pressure gauge 121 are located at the inlet line of the pressure reducing pipe 14. The pressure reducing pipe 14 is connected to the sampler via the diffuser sub 10. The internal material of the pressure reducing pipe 14 is wear-resistant ceramic. The length of the pressure reducing pipe 14 is 1500 mm, the inlet inner diameter is 25 mm, and the outlet inner diameter is 80 mm. The sampling device 15 is connected to the sampler 11 via the sampling line 13. The sampling device 15 is connected to monitoring equipment and instruments for online monitoring. The second pressure relief port 92 and the second pressure gauge 122 are located on the sampler 11. The reflux pipe 16 is installed at the bottom of the sampler 11.

[0058] In a specific implementation, the shut-off valve 3 is opened, and the pulverized coal in the pulverized coal feed tank 1 is drawn out from the pulverized coal pipeline 7 through the fluidizing special element 2. The pulverized coal (particle size 200μm, density 350kg / m³) 3 The conveying pressure is 5.0 MPa. Open regulating valve 4 to introduce nitrogen into pulverized coal pipeline 7 to mix with the pulverized coal, obtaining a mixture. The nitrogen flow rate is 100 Nm³. 3 / h. Open angle valve 5 and monitor the density and velocity of the mixture using density and velocity meter 6. The density of the mixture is 400 kg / m³. 3 The speed is 5 m / s. The first shut-off ball valve 81 is opened and adjusted to convey the mixture to the pressure reducing pipe 14, reducing the pressure to 5 kPa, and then conveying it to the sampler 11 through the diffuser 10. The second shut-off ball valve 82 is opened to convey the mixture to the sampling device 15. The sampling flow rate is 0.15 kg / s. The ash content, sulfur content, total moisture, volatile matter, ash melting point, ash composition, and elemental content of the sample are monitored in real time using a detection instrument. The monitoring results are shown in Table 1.

[0059] Table 1

[0060]

[0061] When the monitoring instrument detects an increase in coal ash content (currently, the general requirement for raw coal ash content (Ad) in fluidized bed pulverized coal gasification is less than 18%), the furnace temperature can be adjusted in time to avoid an increase in slag discharge after the ash content increases.

[0062] Example 2

[0063] The apparatus used in this embodiment for real-time online sampling of pulverized coal in a pulverized coal gasifier is the same as that used in Embodiment 1.

[0064] In the specific implementation process, the shut-off valve 3 is opened, and the pulverized coal in the pulverized coal feed tank 1 is led out from the pulverized coal pipeline 7 through the fluidization special element 2. The pulverized coal (particle size of 200μm, density of 350kg / m³) 3 The conveying pressure is 4.0 MPa. Open regulating valve 4 to introduce nitrogen into pulverized coal pipeline 7 to mix with the pulverized coal, obtaining a mixture. The nitrogen flow rate is 80 Nm³. 3 / h. Open angle valve 5 and monitor the density and velocity of the mixture using density and velocity meter 6. The density of the mixture is 352 kg / m³. 3 The speed is 3.5 m / s. The first shut-off ball valve 81 is opened and adjusted to convey the mixture to the pressure reducing pipe 14, reducing the pressure to 3 kPa, and then conveying it to the sampler 11 through the diffuser 10. The second shut-off ball valve 82 is opened to convey the mixture to the sampling device 15. The sampling flow rate is 0.1 kg / s. The ash content, sulfur content, total moisture, volatile matter, ash melting point, ash composition, and elemental content of the sample are monitored in real time using a detection instrument. The monitoring results are shown in Table 2.

[0065] Table 2

[0066]

[0067] When the monitoring instrument detects abnormalities in the ash fusion point and ash composition of coal in the coal quality analysis, and the ash fusion point flow temperature reaches 1400℃, the furnace temperature can be adjusted in time to avoid the abnormal coal type from being exposed for too long.

[0068] Example 3

[0069] The apparatus used in this embodiment for real-time online sampling of pulverized coal in a pulverized coal gasifier is the same as that used in Embodiment 1.

[0070] In the specific implementation process, the shut-off valve 3 is opened, and the pulverized coal in the pulverized coal feed tank 1 is led out from the pulverized coal pipeline 7 through the fluidization special element 2. The pulverized coal (particle size of 200μm, density of 350kg / m³) 3The conveying pressure is 6.0 MPa. Open regulating valve 4 to introduce nitrogen into pulverized coal pipeline 7 to mix with the pulverized coal, obtaining a mixture. The nitrogen flow rate is 150 Nm³. 3 / h. Open angle valve 5 and monitor the density and velocity of the mixture using density and velocity meter 6. The density of the mixture is 550 kg / m³. 3 The speed is 8 m / s. The first shut-off ball valve 81 is opened and adjusted to convey the mixture to the pressure reducing pipe 14, reducing the pressure to 8 kPa, and then conveying it to the sampler 11 through the diffuser 10. The second shut-off ball valve 82 is opened to convey the mixture to the sampling device 15. The sampling flow rate is 0.2 kg / s. The ash content, sulfur content, total moisture, volatile matter, ash melting point, ash composition, and elemental content of the sample are monitored in real time using a detection instrument. The monitoring results are shown in Table 3.

[0071] Table 3

[0072]

[0073] When the monitoring instrument detects that the ash content of the coal is less than 9% and the ash melting point flow temperature is less than 1200℃ in the coal quality analysis, the furnace temperature can be adjusted in time to prevent the slag from falling off the water-cooled fireplace wall and to avoid effective gas loss.

[0074] The results from the above embodiments demonstrate that sampling high-pressure pulverized coal according to the method described in this invention, coupled with a rapid coal quality testing device, enables real-time dynamic online operation. This allows for real-time detection of the physicochemical parameters of the coal. Based on the current configuration of the gasification unit's online syngas analysis and furnace temperature monitoring equipment, the optimal combustion temperature can be controlled through the ratio of pulverized coal to oxygen, achieving optimized gasification operating parameters. This significantly improves the gasifier's operating efficiency and carbon conversion rate, increases the effective gas production, and reduces carbon dioxide emissions, thereby lowering production costs and achieving the goal of reducing carbon emissions. Furthermore, it prevents gasifier blockage and forced shutdown in multi-coal gasification units due to changes in coal type; and it allows for timely adjustment of furnace temperature to prevent abnormal conditions such as localized slag detachment from the water-cooled walls caused by changes in coal quality.

[0075] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A method for real-time online sampling of pulverized coal in a pulverized coal gasification furnace, characterized in that, The method is implemented in an online sampling device, which includes: a coal powder feed tank (1), a coal powder pipeline (7), a speed regulating gas pipeline (17), a pressure reducing pipe (14), a sampler (11), a sampling pipeline (13), a sampling device (15), and a return pipe (16). The speed regulating gas pipeline (17) is connected to the coal powder pipeline (7). The coal powder feed tank (1), the coal powder pipeline (7), the pressure reducing pipe (14), and the sampler (11) are connected in sequence. One end of the sampling pipeline (13) is connected to the sampling device (15), and the other end extends into the sampler (11). The return pipe (16) is located at the bottom of the sampler (11). The method includes the following steps: (1) The pulverized coal from the pulverized coal feed tank (1) is mixed with the speed regulating gas introduced through the speed regulating gas pipeline (17) in the pulverized coal pipeline (7) to obtain a mixture. (2) The mixture is conveyed to the pressure reducing tube (14) to reduce the pressure of the mixture to the target pressure, and then conveyed to the sampler (11); (3) The sampling device (15) takes samples through the sampling pipeline (13); (4) After sampling is completed, the remaining coal powder in the sampler (11) is returned to the coal powder feed tank (1) through the return pipe (16) for reuse.

2. The method according to claim 1, characterized in that, In step (1), the conveying pressure of the pulverized coal is 4.5-5.2 MPa.

3. The method according to claim 1 or 2, characterized in that, In step (1), the coal powder has a particle size of <500μm and a density of 150-500kg / m³. 3 .

4. The method according to any one of claims 1-3, characterized in that, In step (1), the regulating gas is nitrogen and / or carbon dioxide.

5. The method according to any one of claims 1-4, characterized in that, In step (1), the flow rate of the speed regulating gas is 50-150 Nm³. 3 / h.

6. The method according to claim 1, characterized in that, In step (2), the target pressure is 1-10 kPa.

7. The method according to claim 1 or 6, characterized in that, In step (2), the length of the pressure reducing tube (14) is 1000-3500mm.

8. The method according to claim 1, 6, or 7, characterized in that, In step (2), the inlet inner diameter of the pressure reducing tube (14) is 20-30 mm; and / or, The outlet inner diameter of the pressure reducing pipe (14) is 50-100mm.

9. The method according to claim 1, 5, or 6, characterized in that, In step (2), the internal material of the pressure reducing tube (14) is wear-resistant ceramic.

10. The method according to claim 1, characterized in that, In step (3), the sampling process has a flow rate of 0.1-0.2 kg / s.

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