Sampling device suitable for high pressure dense phase conveying conditions and method for co-gasification of coal and biomass

Abstract

The present application relates to the technical field of coal and biomass co-gasification, and discloses a sampling device suitable for high-pressure dense-phase conveying conditions and a method for coal and biomass co-gasification. The sampling device comprises a conveying pipeline and an introduction component and an exit component respectively located at two ends of the conveying pipeline; the introduction component is in a curved shape, and a plurality of openings are arranged on the pipe wall of the introduction component, so that the material to be detected can enter the conveying pipeline through the openings; a sweeping component is arranged at the middle part of the conveying pipeline to sweep the conveying pipeline; the exit component comprises a diameter-expanding connecting part and a pressure-reducing pipe, the small-diameter end of the diameter-expanding connecting part is connected with the outlet end of the conveying pipeline, and the large-diameter end is connected with the pressure-reducing pipe. The sampling device can be adapted to the sampling of biomass and coal blending mixed materials, and can sample the raw materials in the coal and biomass co-gasification conditions in real time and safely, and provide accurate data support for the adjustment of the biomass blending ratio.

Description

Technical Field

[0001] This invention relates to the field of coal and biomass co-gasification technology, specifically to a sampling device suitable for high-pressure dense-phase conveying conditions and a method for coal and biomass co-gasification. Background Technology

[0002] Currently, coal has long been the dominant energy source in China's energy consumption structure. Biomass energy, due to its abundant resources, environmental friendliness, and renewability, has become an important supplementary and alternative energy source. Co-gasification of biomass and coal can achieve complementary advantages. Biomass has high oxygen and alkali metal content, which can improve gasification reaction activity, reduce tar formation, mitigate slagging and corrosion, and simultaneously reduce nitrogen and sulfur pollutant emissions. Coal supply is stable, and gasification temperature is high, which can compensate for the unstable supply and low gasification efficiency of biomass. Therefore, co-gasification of biomass and coal is an important technical route for achieving clean and efficient utilization of coal and large-scale utilization of biomass. However, due to the diverse types of raw materials, large fluctuations in moisture content, and significant differences in ash characteristics compared to coal, even small changes in the blending ratio of biomass can lead to significant fluctuations in the coal quality parameters of the blend, easily causing problems such as gasifier blockage, corrosion, and unplanned shutdowns. Therefore, real-time and accurate coal quality monitoring of the blended mixture is a core prerequisite for the long-term, efficient, and stable operation of biomass-co-gasification units.

[0003] Currently, existing sampling and testing technologies in the industry are designed for the operation of pure pulverized coal boilers under normal pressure, low dust, and low wear conditions. They cannot adapt to the special operating conditions of coal-biomass co-gasification, such as high-pressure dense-phase conveying, high material viscosity, easy moisture absorption and agglomeration, easy alkali metal deposition on the walls, and severe particle erosion and wear. This not only easily leads to problems such as sampling pipeline blockage, poor sample representativeness, and severe equipment wear, but also lacks safety designs for multi-stage pressure reduction, inerting explosion prevention, and multi-stage isolation under high-pressure conditions, posing high risks such as dust leakage and explosion. At the same time, existing rapid coal quality testing technologies are only for pure pulverized coal component analysis and do not cover biomass characteristic indicators and co-gasification control requirements. The test results cannot directly guide the real-time adjustment of key process parameters such as biomass blending ratio, oxygen-coal ratio, and gasifier temperature, resulting in serious lag in coal quality monitoring and inaccurate operating condition control. This can easily lead to gasifier blockage, slagging, high-temperature corrosion, and even unplanned shutdowns, seriously restricting the safe and stable operation and large-scale promotion of coal-biomass co-gasification units. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems in existing technologies where real-time monitoring of the materials co-gasified by biomass and coal is impossible, and the biomass blending ratio cannot be adjusted in real time, leading to problems such as gasifier blockage, corrosion, and unplanned shutdowns. This invention provides a sampling device and a method for co-gasifying coal and biomass. The sampling device is adaptable to sampling biomass and coal blended mixtures, suitable for real-time sampling under high-pressure dense-phase conveying conditions. It can sample raw materials in coal and biomass co-gasification conditions in real time and safely, enabling simultaneous detection of raw material properties and process control, solving the problem of lagging coal quality monitoring, and providing accurate data support for adjusting the biomass blending ratio.

[0005] To achieve the above objectives, the present invention provides a sampling device, which includes a delivery pipeline and an inlet component and an outlet component located at both ends of the delivery pipeline. The inlet component is curved and has several openings on its tube wall, allowing the material to be tested to enter the conveying pipeline through the openings. A purging component is provided in the middle of the delivery pipeline for purging the delivery pipeline; The lead-out component includes an expanded diameter connecting part and a pressure reducing pipe. The small diameter end of the expanded diameter connecting part is connected to the outlet end of the conveying pipeline, and the large diameter end is connected to the pressure reducing pipe.

[0006] Preferably, the pipeline at the connection between the delivery pipeline and the lead-out component is curved.

[0007] Preferably, the bending radius of the pipeline at the connection between the conveying pipeline and the enlarged diameter connection (3) is 9-12 times the pipeline diameter.

[0008] Preferably, the delivery pipeline is further provided with a first shut-off valve and a second shut-off valve.

[0009] Preferably, the purging component is disposed between the first shut-off valve and the second shut-off valve.

[0010] Preferably, the pressure-reducing pipe is a flange connection pipe with an inner diameter ≤20mm.

[0011] Preferably, the flange connecting pipe has a ceramic component inside, and the length of the ceramic component is greater than 1 meter.

[0012] Preferably, the ceramic component is made of alumina corundum ceramic.

[0013] A second aspect of the present invention provides a method for co-gasification of coal and biomass, the method comprising: conveying a mixture containing coal and biomass to a gasification device via a material delivery pipeline for gasification reaction; inserting the inlet component of the sampling device into the material delivery pipeline for sampling; and conveying the sample to a detection device for detecting the lower heating value, total moisture, dry ash-free volatile matter content, ash flow temperature, and alkali metal content of the mixture.

[0014] Preferably, the weight content of biomass in the mixture is adjusted according to the lower heating value, total moisture, dry ash-free volatile content, ash flow temperature and alkali metal content of the mixture.

[0015] Preferably, the biomass content in the mixture is 5-50 wt%.

[0016] Preferably, by adjusting the weight content of biomass in the mixture, the lower heating value of the mixture is 16.5-19.5 MJ / kg, the ash flow temperature is 1300-1420℃, the total alkali metal content is 1.5wt%-3.0wt%, the total moisture content entering the furnace is 10wt%-16wt%, and the content of dry ash-free volatile matter is 30wt%-40wt%.

[0017] Preferably, the sampling method of the sampling device includes: closing the first shut-off valve, opening the second shut-off valve, and using the purging component to purge the delivery pipeline; The first shut-off valve is opened, and the mixture is conveyed to the conveying pipeline through the opening provided on the inlet component by the pressure difference. Then, it is conveyed to the detection device for detection after being depressurized by the expansion connection and the pressure reducing pipe.

[0018] Preferably, the mixture is depressurized to 0.5-1.5 MPa through the expanded diameter connection, and then depressurized to 0.05-0.2 MPa through the depressurization pipe.

[0019] Preferably, the pressure and flow rate of the mixture in the material delivery pipeline are monitored before sampling is performed using the sampling device.

[0020] Preferably, the pressure of the mixture is 2-5 MPa, and the flow rate of the mixture is 3-15 t / h.

[0021] Preferably, the method further includes: returning the detected material from the detection device and transporting it to the gasification device for gasification reaction via the material delivery pipeline.

[0022] The beneficial effects of this invention are as follows: (1) The sampling device of the present invention is adapted to the characteristics of biomass and coal blended materials with high viscosity, easy agglomeration, and easy deposition of alkali metals. The sampling device is designed with special anti-clogging inlet components and anti-deposition sampling structure to achieve representative and continuous online sampling of the mixture, and solve the problems of sampling pipeline blockage and large sampling error. In view of the characteristics of biomass blended materials with high viscosity, easy moisture absorption and agglomeration, and easy alkali metal deposition on the wall, the present invention adopts a curved open-hole inlet component and a large-radius anti-wear elbow structure. The material flow is smooth, it is not easy to hit the pipe wall, and no eddy dead zone is formed. The structure avoids pipe blockage, material hanging, scaling and sampling distortion, and achieves continuous, stable and highly representative online sampling. It adopts a large-radius wear-resistant elbow and an alumina corundum ceramic pressure reducing pipe with an inner diameter ≤20mm and an inner lining length >1 meter. It has high hardness, high wear resistance, corrosion resistance and excellent thermal shock stability. It can withstand long-term scouring of high pressure, high flow rate and high particle concentration, significantly reduce pipeline wear and extend equipment service life. It is fully compatible with the high-pressure conveying conditions of dry coal powder co-gasification, while conventional pure coal powder sampling devices do not have such reinforced wear-resistant design. (2) The sampling device described in this invention can realize stepwise and safe pressure reduction sampling from the co-gasification process sampling and conveying system to atmospheric pressure through the set expansion diameter connection part and pressure reducing pipe, construct a multi-level isolation and inerting protection structure, realize two-level stable pressure reduction through the expansion diameter connection part and ceramic pressure reducing pipe, and cooperate with double shut-off valve isolation and nitrogen / carbon dioxide purging inerting protection to effectively control the sampling pressure difference, suppress dust flying, reduce the risk of explosion, avoid the industry pain points of easy leakage and unsafe high pressure sampling, and meet the safe sampling requirements of co-gasification high pressure working conditions; (3) By using the sampling device described in this invention, the core parameters of the mixed coal powder and the characteristic parameters of biomass can be detected online in real time, which solves the problem of lagging coal quality monitoring, provides accurate data support for adjusting the biomass blending ratio, and further establishes the linkage control logic between the sampling and detection data and the core process parameters such as the biomass blending ratio, oxygen-coal ratio, and gasifier temperature, so as to realize the dynamic and accurate adjustment of the process, prevent slag blockage, slagging, and excessive tar, avoid unplanned shutdown of the gasifier, and significantly improve the co-gasification reaction efficiency, operational stability and long-term operation capability. (4) The material after testing can be returned to the powder silo and sent back to the gasification system to realize the full recycling of the sample, which reduces raw material loss and avoids dust discharge, meeting the process requirements of green, low-carbon and resource utilization, and has outstanding economic and environmental benefits. (5) The structure is simple, maintenance is convenient, and industrialization is highly promotable. The overall layout of the device is compact, the valves and pipelines are standardized, and it has complete designs for maintenance, pressure relief and cleaning. It does not require large-scale modification of the existing co-gasification system and can be directly adapted to gasification devices of different scales. The engineering implementation is simple, the reliability is high, and it has the value of large-scale industrialization. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the sampling device described in this invention.

[0024] Explanation of reference numerals in the attached figures 1. Inlet component; 2. Purge component; 3. Expanded diameter connection part; 4. Pressure reducing pipe; 5. First shut-off valve; 6. Second shut-off valve. Detailed Implementation

[0025] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0026] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0027] Currently, the industry still relies on traditional methods of manual offline sampling and laboratory analysis for the testing of coal and biomass co-gasification mixtures. This approach suffers from inherent drawbacks such as detection lag, large errors, and poor real-time performance. Furthermore, it fails to address the high viscosity, agglomeration, and alkali metal deposition characteristics of biomass-blended mixtures. Simultaneously, the co-gasification process utilizes a high-pressure dense-phase pulverized coal conveying system, posing high risks of material leakage and dust explosions. Existing conventional sampling devices cannot achieve safe, continuous, and reliable online sampling, resulting in a lack of timely and accurate data support for adjusting the biomass blending ratio. This severely restricts the controllability, operational safety, and economy of the co-gasification system. Therefore, this invention provides a dedicated online sampling device adapted to the high-pressure conditions of coal and biomass co-gasification, along with complete sampling, testing, control, and material recovery methods. It enables continuous and stable sampling under high-pressure, high-dust, high-abrasion, and easily agglomerated conditions, obtaining key parameters of the mixture in real time and providing a reliable basis for precise control of the co-gasification process.

[0028] Specifically, the structural schematic diagram of the sampling device suitable for high-pressure dense-phase transportation conditions is as follows: Figure 1 As shown, the sampling device includes a conveying pipeline and an inlet component 1 and an outlet component located at both ends of the conveying pipeline. The material to be tested enters the conveying pipeline through the inlet component 1 and is then conveyed to the testing device for testing via the outlet component.

[0029] In some preferred embodiments, the inlet component 1 is curved, and several openings are provided on the pipe wall of the inlet component 1. The material to be tested (i.e., a mixture containing coal and biomass) can enter the conveying pipeline through the openings on the inlet component 1, avoiding direct impact of the material and reducing clumping and pipe blockage. By setting the inlet component 1 to a curved shape and further providing several openings at its bend, it ensures that the mixture is drawn out evenly and prevents the material to be tested from adhering to and wearing off the pipeline, solving the problem of clumping and deposition. This prevents the material to be tested from clogging the pipeline and improves the continuity of the entire sampling process.

[0030] In this embodiment, a purging component 2 is provided in the middle of the conveying pipeline. The purging component 2 is used to purge the conveying pipeline before sampling. By continuously and periodically purging the conveying pipeline, the material to be tested can be prevented from sticking and clogging the pipeline, thus ensuring the continuity of sampling. In addition, in some embodiments, high-pressure nitrogen and / or carbon dioxide can be used as purging gas. This can utilize the inerting properties of the purging gas to reduce the risk of dust explosion during the sampling process, adapting to the low explosion limit characteristics of the mixed dust and meeting the safety requirements of the co-gasification process. In this invention, the middle of the conveying pipeline refers to any position where the purging component 2 is located between the two ends of the conveying pipeline, preferably the middle position.

[0031] In some embodiments, the conveying pipeline is further provided with a first shut-off valve 5 and a second shut-off valve 6. Specifically, the purging component 2 is disposed between the first shut-off valve 5 and the second shut-off valve 6. In a more specific embodiment, along the flow direction of the material to be treated in the conveying pipeline, the first shut-off valve 5 is disposed upstream of the purging component 2, and the second shut-off valve 6 is disposed downstream of the purging component 2.

[0032] In this embodiment, when the purging component 2 is used to purge the conveying pipeline, since the inlet component 1 is connected to the material delivery pipeline of the coal and biomass co-gasification process, in order to avoid the situation where the pressure in the conveying pipeline is unstable during the purging process and purging cannot be carried out, the first shut-off valve 5 can be closed first, and then the purging component 2 and the second shut-off valve 6 can be opened to purge the part of the conveying pipeline after the first shut-off valve 5.

[0033] In some embodiments, to adapt to the high-pressure conditions of coal and biomass co-gasification, the sampling device's lead-out component includes an enlarged-diameter connection 3 and a pressure-reducing pipe 4. Specifically, the enlarged-diameter connection 3 includes a small-diameter end and a large-diameter end. The small-diameter end is connected to the outlet end of the conveying pipeline, and the large-diameter end is connected to the pressure-reducing pipe 4. The material to be processed undergoes a first-stage pressure reduction through the enlarged-diameter connection 3, and then a second-stage pressure reduction through the pressure-reducing pipe 4, achieving step-by-step and stable pressure reduction of the high-pressure material to be processed, ensuring that the pressure after pressure reduction does not affect the sampling device.

[0034] In some embodiments, the expanded diameter connection 3 can be a 4-inch diffuser sub, comprising a small-diameter end and a large-diameter end; wherein the small-diameter end is connected to the outlet end of the conveying pipeline, and the large-diameter end is 4 inches (DN100) and connected to the pressure reducing pipe 4. The material to be processed undergoes a first-stage stable pressure reduction through the expanded diameter connection 3, and then a second-stage pressure reduction through the pressure reducing pipe 4. This two-stage step-by-step pressure reduction allows the high-pressure material to smoothly transition to near atmospheric pressure, avoiding sudden pressure changes that could impact the sampling device and detection system. In this invention, 4 inches = nominal diameter DN100, referring to the pipe diameter of the diffuser sub and the specifications of the matching connecting flanges; both ends of the connecting pipes have a diameter of DN100.

[0035] In some embodiments, the pressure-reducing pipe 4 is a flanged connection pipe, and the inner diameter of the flanged connection pipe is ≤20mm, for example, 8-20mm. In some preferred embodiments, the flanged connection pipe is provided with a wear-resistant ceramic component inside. The wear-resistant ceramic component can prevent the deposition and wear of alkali metals and hard particles in the coal and biomass mixture, further adapting to the characteristics of the mixture after biomass co-firing. In some embodiments, the length of the ceramic component is >1 meter, more preferably 10-15mm. In addition, the ceramic component is 95% alumina corundum ceramic, integrally formed or precisely segmented and spliced, with a smooth inner wall, high wear resistance, corrosion resistance, and thermal shock resistance. It is firmly bonded to the steel pipe, suitable for high-pressure particle erosion and long-term continuous operation, significantly reducing pipeline wear, extending equipment service life, and fully adapting to the high-pressure conveying conditions of dry coal powder co-gasification.

[0036] In some preferred embodiments, the pipeline at the connection between the conveying pipeline and the lead-out component is curved, and a large-radius anti-wear elbow can be used. By setting the pipeline at the connection between the conveying pipeline and the lead-out component to be curved, adhesion, wear and leakage of the material to be tested during high-speed flow can be further avoided, and the continuity of the sampling process can be further guaranteed.

[0037] In some preferred embodiments, the pipeline connecting the conveying pipeline and the lead-out component can use a 10D large-radius anti-wear elbow, i.e., the bending radius is 10 times the pipe diameter. The sampling device of this invention addresses the characteristics of biomass blended materials—high viscosity, easy moisture absorption and clumping, and easy alkali metal deposition on the walls—by employing a bent, open-type lead-out component and a 10D large-radius anti-wear elbow structure. This ensures smooth material flow, reduces the risk of impact on the pipe wall, and prevents the formation of eddy current dead zones. Structurally, it avoids pipe blockage, material buildup, scaling, and sampling distortion, achieving continuous, stable, and highly representative online sampling. Furthermore, the combined use of a 10D large-radius anti-wear elbow and a 95% alumina corundum ceramic pressure-reducing pipe with an inner diameter ≤20mm and an inner lining length >1 meter combines high hardness, high wear resistance, corrosion resistance, and excellent thermal shock stability. It can withstand long-term scouring under high pressure, high flow rate, and high particle concentration, significantly reducing pipeline wear, extending equipment lifespan, and is fully adaptable to the high-pressure conveying conditions of dry coal powder co-gasification.

[0038] In some embodiments, the material to be tested output from the sampling device can be directly transported to the testing device for rapid detection of the lower heating value, total moisture, dry ash-free volatile matter content, ash flow temperature, and alkali metal content of the coal and biomass mixture. Simultaneously, the acquired detection data can be directly used for systemic control of the coal and biomass co-gasification process. This allows for the establishment of a linkage control logic between the sampling and detection data and core process parameters such as the co-gasification biomass blending ratio, oxygen-to-coal ratio, and gasifier temperature. This enables dynamic and precise adjustment of the coal and biomass co-gasification process, preventing problems such as slag blockage, slagging, and excessive tar in the gasification unit, and improving the stability and efficiency of the coal and biomass co-gasification reaction.

[0039] The present invention further provides a method for co-gasification of coal and biomass, the method comprising: conveying a mixture containing coal and biomass to a gasification device through a material delivery pipeline for gasification reaction; inserting the inlet component 1 of the sampling device into the material delivery pipeline for sampling; and conveying the sample to a detection device for detecting the lower heating value, total moisture, dry ash-free volatile matter content, ash flow temperature and alkali metal content of the mixture.

[0040] In the method described in this invention, the biomass content in the mixture is 5-50 wt%. Furthermore, the biomass content in the mixture can be further adjusted based on the lower heating value, total moisture content, dry ash-free volatile matter content, ash flow temperature, and alkali metal content of the mixture, thereby achieving a lower heating value of 16.5-19.5 MJ / kg, an ash flow temperature of 1300-1420℃, a total alkali metal content of 1.5 wt%-3.0 wt%, a total moisture content entering the furnace of 10 wt%-16 wt%, and a dry ash-free volatile matter content of 30 wt%-40 wt%. Understandably, given that the biomass content in the mixture is 5-50 wt%, the biomass content can be further fine-tuned within the range of 5-50 wt% according to the properties of the mixture, so that the lower heating value of the mixture is 16.5-19.5 MJ / kg, the ash flow temperature is 1300-1420℃, the total alkali metal content is 1.5 wt%-3.0 wt%, the total moisture content entering the furnace is 10 wt%-16 wt%, and the content of dry ash-free volatile matter is 30 wt%-40 wt%.

[0041] Specifically, when the net calorific value of the mixture is <16.0 MJ / kg, total moisture >18 wt%, dry ash-free volatile matter >42%, ash flow temperature <1250℃, or total alkali metal content >3.5 wt%, the biomass blending ratio should be reduced by 2 wt% to 5 wt% in a single adjustment; when the net calorific value of the mixture is >20.0 MJ / kg, total moisture <8 wt%, dry ash-free volatile matter <28%, ash flow temperature >1450℃, or total alkali metal content <1.2 wt%, the biomass blending ratio should be increased by 2 wt% to 4 wt% in a single adjustment.

[0042] In addition, under long-term stable industrial production conditions, the preferred biomass blending mass fraction is 5wt% to 15wt%; when the biomass blending mass fraction is >30wt%, it is limited to intermittent trial firing conditions, and long-term continuous operation is strictly prohibited. The maximum biomass blending mass fraction shall not exceed 50wt%.

[0043] In some embodiments, the method for sampling the coal-biomass mixture in the material delivery pipeline using the sampling device includes: closing the first shut-off valve 5, opening the second shut-off valve 6, and purging the delivery pipeline using the purging component 2; opening the first shut-off valve 5, allowing the coal-biomass mixture to be transported into the delivery pipeline through an opening on the inlet component 1 via a pressure difference, and then conveyed to the detection device for detection after being depressurized by the expansion connector 3 and the pressure reducing pipe 4. Specifically, since the coal and biomass co-gasification process uses a high-pressure dense-phase delivery process, the material delivery pipeline is under high pressure, while the pressure on the detection side of the sampling device is lower than the pressure in the material delivery pipeline. Therefore, when the first shut-off valve 5 is opened, the mixture in the material delivery pipeline automatically enters the sampling device under the pressure difference, achieving safe, stable, unpowered, and highly representative online sampling under high-pressure conditions.

[0044] In some embodiments, a third shut-off valve and a fourth shut-off valve are sequentially installed along the flow direction of the mixture on the material delivery pipeline. Between the third and fourth shut-off valves, a pressure measuring device (pressure gauge) and a flow measuring device (flow meter) are installed to monitor the material pressure and flow rate within the material delivery pipeline, respectively. The flow rate is calculated using a density meter and a velocity meter to ensure low density and low velocity, effectively controlling pipeline wear. Before sampling, the third shut-off valve is opened first, and the pressure and flow rate within the pipeline are monitored and stabilized using the pressure gauge and flow meter. After confirming that the preset sampling conditions have been met, the second shut-off valve 6 is opened, and the delivery pipeline is purged using the purging component 2 to ensure that the pipeline is clean and free of residual material before sampling.

[0045] In some embodiments, before sampling, the pressure of the mixture, as measured by the pressure measuring device, is 2-5 MPa, preferably 2.2-3.8 MPa, and the flow rate of the mixture is 3-15 t / h, preferably 7-8 t / h. By stably controlling the pressure and flow rate of the mixture in the material delivery pipeline, the conveying conditions can be highly adapted to the sampling conditions of the sampling device described in this invention, ensuring a continuous, stable, safe, and reliable sampling process. This avoids sampling distortion, pipeline impact, or blockage caused by pressure and flow fluctuations. Stable flow control effectively controls the density and velocity stability within the pipeline, preventing wear.

[0046] In some embodiments, the specific method for sampling the coal and biomass mixture in the material delivery pipeline using the sampling device includes: first opening the third shut-off valve on the material delivery pipeline, then using a pressure measuring device to test the pressure and flow rate of the mixture in the pipeline to ensure stability and meet the sampling conditions, and then opening the second shut-off valve 6 and using the purging component 2 to purge the delivery pipeline. Next, the fourth shut-off valve on the material delivery pipeline is opened. After confirming that the inlet component 1 of the sampling device is in normal condition, the first shut-off valve 5 is slowly opened. The pressure difference allows the coal and biomass mixture in the material delivery pipeline to smoothly enter the conveying pipeline through the opening provided on the inlet component 1. Then, after being depressurized by the expansion connection part 3 and the pressure reducing pipe 4, it is conveyed to the detection device for detection.

[0047] In some embodiments, the mixture in the delivery pipeline is depressurized to 0.5-1.5 MPa through the expansion joint 3, and then depressurized to 0.05-0.2 MPa through the depressurization pipe 4.

[0048] In the method described in this invention, the coal and biomass mixture in the material delivery pipeline is extracted using the sampling device and transported to a testing device for analysis. Key parameters of the mixture, such as moisture, ash content, volatile matter, fixed carbon, total sulfur, lower heating value, ash melting point, ash composition, alkali metal content, and particle size distribution, are obtained. Based on the obtained calorific value, ash melting point, alkali metal content, moisture, and volatile matter indicators, the weight ratio of biomass in the mixture is adjusted in real time. This method achieves integrated and intelligent "sampling-detection-process control" of the co-gasification mixture, providing technical support for precise and intelligent control of the biomass co-firing ratio, and significantly improving the operational stability, intelligence level, and industry competitiveness of coal and biomass co-gasification devices.

[0049] In some embodiments, the material that has been tested in the testing device can be further returned and transported again to the gasification unit for gasification reaction through the material delivery pipeline. This enables the recycling and reuse of the mixture, reducing sample processing costs and avoiding waste of biomass raw materials, which aligns with the technological characteristics of biomass energy resource utilization. Specifically, the tested material can be returned to the powder silo in the coal and biomass co-gasification system, and then transported to the gasification unit for gasification reaction through the material delivery pipeline.

[0050] The present invention will be described in detail below through embodiments, but the scope of protection of the present invention is not limited thereto.

[0051] The sampling devices used in the following embodiments and comparative examples have the following structures: Figure 1 As shown.

[0052] Example 1 The mixture of coal and biomass is transported to the gasification unit through a material delivery pipeline for gasification reaction (gasification reaction temperature controlled at 1350℃, system operating pressure at 3.0 MPa). The inlet component 1 of the sampling device is inserted into the material delivery pipeline to take a sample, which is then transported to the detection device to detect the lower heating value, total moisture, dry ash-free volatile matter content, ash flow temperature, and alkali metal content of the mixture. The biomass co-firing ratio is then adjusted based on the data obtained from the detection. The specific method for sampling the coal and biomass mixture in the material delivery pipeline using the sampling device includes: first, opening the third shut-off valve on the material delivery pipeline; then, using a pressure measuring device to test the pressure (pressure is 3.0 MPa) and flow rate of the mixture (flow rate is 7.5 t / h) in the pipeline to ensure they are stable and meet the sampling conditions; then, opening the second shut-off valve 6 and using the purging component 2 to purge the delivery pipeline. Next, the fourth shut-off valve on the material delivery pipeline is opened, and the status of the sampling device inlet component 1 is confirmed to be normal. The first shut-off valve 5 is slowly opened, and the coal and biomass mixture in the material delivery pipeline is smoothly introduced into the delivery pipeline through the opening provided on the inlet component 1 by the pressure difference. Then, the pressure is reduced to 1.0 MPa through the expansion connection part 3, and then reduced to 0.1 MPa through the pressure reducing pipe 4 before being delivered to the detection device for detection.

[0053] The operational results show that by using the device and process of this invention, the co-gasification reaction efficiency is increased by 12%, the continuous and stable operation time of the gasifier is extended by 600 hours, the tar generation is reduced by 16%, the raw material utilization rate is increased by 8%, the frequency of unplanned shutdowns is reduced to ≤1 time per year, the entire process sampling is continuous and unblocked, the operating condition control is precise and timely, and the long-term stable operation capability of the gasification device is significantly improved.

[0054] Example 2 The mixture of coal and biomass is transported to the gasification unit through a material delivery pipeline for gasification reaction (gasification reaction temperature controlled at 1400℃, system operating pressure at 2.5 MPa). The inlet component 1 of the sampling device is inserted into the material delivery pipeline to take a sample, which is then transported to the detection device to detect the lower heating value, total moisture, dry ash-free volatile matter content, ash flow temperature, and alkali metal content of the mixture. The biomass co-firing ratio is then adjusted based on the data obtained from the detection. The specific method for sampling the coal and biomass mixture in the material delivery pipeline using the sampling device includes: first, opening the third shut-off valve on the material delivery pipeline; then, using a pressure measuring device to test the pressure (pressure is 2.5 MPa) and flow rate of the mixture (flow rate is 7 t / h) in the pipeline to ensure they are stable and meet the sampling conditions; then, opening the second shut-off valve 6 and using the purging component 2 to purge the delivery pipeline. Next, the fourth shut-off valve on the material delivery pipeline is opened, and the status of the sampling device inlet component 1 is confirmed to be normal. The first shut-off valve 5 is slowly opened, and the coal and biomass mixture in the material delivery pipeline is smoothly introduced into the delivery pipeline through the opening provided on the inlet component 1 by the pressure difference. Then, the pressure is reduced to 0.8 MPa through the expansion connection part 3, and then reduced to 0.1 MPa through the pressure reducing pipe 4 before being delivered to the detection device for detection.

[0055] The operational results show that, by using the device and process of this invention, the co-gasification reaction efficiency is increased by 10%, the continuous and stable operation time of the gasifier is extended by 500 hours, the tar generation is reduced by 14%, the raw material utilization rate is increased by 7%, the frequency of unplanned shutdowns is reduced to ≤1 time per year, the sampling conditions are well adapted, there is no material deposition or blockage, and the stability and economy of the gasification reaction are optimized simultaneously.

[0056] Example 3 A mixture of coal and biomass is transported to a gasification unit via a material delivery pipeline for gasification reaction (gasification reaction temperature controlled at 1380℃, system operating pressure at 3.5 MPa). The inlet component 1 of the sampling device is inserted into the material delivery pipeline to take a sample, which is then transported to a detection device to detect the lower heating value, total moisture, dry ash-free volatile matter content, ash flow temperature, and alkali metal content of the mixture. The biomass co-firing ratio is then adjusted based on the data obtained from the detection. The specific method for sampling the coal and biomass mixture in the material delivery pipeline using the sampling device includes: first, opening the third shut-off valve on the material delivery pipeline; then, using a pressure measuring device to test the pressure (pressure is 3.5 MPa) and flow rate of the mixture (flow rate is 8 t / h) in the pipeline to ensure they are stable and meet the sampling conditions; then, opening the second shut-off valve 6 and using the purging component 2 to purge the delivery pipeline. Next, the fourth shut-off valve on the material delivery pipeline is opened, and the status of the sampling device inlet component 1 is confirmed to be normal. The first shut-off valve 5 is slowly opened, and the coal and biomass mixture in the material delivery pipeline is smoothly introduced into the delivery pipeline through the opening provided on the inlet component 1 by the pressure difference. Then, the pressure is reduced to 1.2 MPa through the expansion connection part 3, and then reduced to 0.15 MPa through the pressure reducing pipe 4 before being delivered to the detection device for detection.

[0057] The operating results show that: by using the device and process described in this invention, the co-gasification reaction efficiency is increased by 14%, the continuous and stable operation time of the gasifier is extended by 700 hours, the tar generation is reduced by 18%, the raw material utilization rate is increased by 9%, and the frequency of unplanned shutdowns is reduced to once a year or less. It can be adapted to high moisture content and high fluctuation biomass co-firing conditions, has strong anti-interference ability, and excellent safety and stability performance.

[0058] Example 4 Coal and biomass were mixed in the same proportion as in Example 1 to obtain a mixture, which was then transported to a gasification unit for gasification reaction via a high-pressure material delivery pipeline. The gasification reaction temperature was controlled at 1350°C, and the system operating pressure was 3.0 MPa. The inlet component 1 of the sampling device described in this invention was inserted into the material delivery pipeline to take a sample, and the obtained sample was transported to a testing device to detect the lower heating value, total moisture, dry ash-free volatile matter content, ash flow temperature, and alkali metal content of the mixture. The biomass co-firing ratio was then adjusted based on the data obtained from the tests. Before sampling, the shut-off valve on the material delivery pipeline is opened, and the operating conditions are monitored using a pressure and flow monitoring device. The pressure of the mixture in the material delivery pipeline is controlled at 1.0 MPa, and the flow rate is controlled at 2.5 t / h. Then, the first shut-off valve 5 is closed, and the second shut-off valve 6 is opened. The delivery pipeline is then purged with high-pressure nitrogen using the purging component 2. After purging, the first shut-off valve 5 is slowly opened, canceling the two-stage step-by-step pressure reduction method. This allows the material to be directly depressurized to atmospheric pressure (approximately 0.1 MPa) in one go after passing through the expansion connector 3, and the material then enters the detection device.

[0059] Process adjustments are made based on the test results, and the material after testing is returned to the powder silo for recycling. Experimental results show that: because the pressure and flow rate of the material delivery pipeline are not within the preferred range defined by this invention, the material flow is highly volatile, the sampling representativeness is poor, and local blockage and material deposition in the sampling pipeline are prone to occur; at the same time, because the two-stage stable pressure reduction method of this invention is not adopted, sudden pressure changes cause significant pipeline impact and poor operational stability, making it impossible to achieve continuous, stable, and safe online sampling under high-pressure conditions.

[0060] The operational results show that without using the material pressure, flow rate, and two-stage pressure reduction parameter ranges defined in this invention, the operating conditions are poorly matched, sampling fluctuations are large, and control is lagging. The co-gasification reaction efficiency is only improved by 3%, the continuous stable operation time of the gasifier is only extended by 120 hours, the tar generation is only reduced by 5%, the raw material utilization rate is only improved by 2%, the frequency of unplanned shutdowns cannot be effectively controlled, and the number of shutdowns per year increases significantly. The sampling pipeline is prone to material deposition and unstable flow, making it impossible to achieve long-term continuous and stable sampling, and the accuracy of process control is greatly reduced.

[0061] Comparative Example 1 The sampling device used in Comparative Example 1 is a conventional straight pipe type with an opening structure, that is, the sampling device is a single straight pipe with a shut-off valve installed on the straight pipe for on / off control. During the experiment, it was found that traditional straight-pipe inlet components are unsuitable for the high viscosity, hygroscopicity, and alkali metal deposition and adhesion characteristics of coal-biomass mixtures. High-speed material flow directly impacts the pipe wall, easily causing material adhesion, clumping, and blockage at the sampling holes and on the inner walls of the pipeline. Ordinary small-radius elbows exhibit turbulent flow patterns and significant local eddies, resulting in severe wear from long-term high-speed scouring by hard solid particles, leading to a short equipment lifespan. The lack of expansion, staged pressure reduction, and ceramic wear-resistant lining structures not only fails to achieve stable, step-by-step pressure relief of high-pressure materials, but also causes sudden pressure drops that result in pulsating airflow, large fluctuations in sampling flow, and poor sample representativeness. Furthermore, the inner walls of the pipeline lack resistance to alkali metal corrosion and particle resistance. The weak flushing capacity makes it prone to pipe wall thinning and media leakage during long-term operation. Furthermore, the lack of dual-valve isolation and nitrogen / carbon dioxide inert purging design means that residual materials cannot be cleaned promptly, significantly increasing the frequency of blockages. In addition, the absence of explosion-proof safety protection under high-pressure dense-phase dust conditions poses a high risk of dust leakage and explosion. Overall, it fails to meet the requirements of high-pressure, high-wear, easily adhesive, and high-safety-level online continuous sampling conditions in coal and biomass co-gasification. This further demonstrates the necessity and technical superiority of the core structural designs of this invention, including the curved opening inlet component, the 10D large-radius anti-wear elbow, the two-stage graded pressure-reducing ceramic-lined pipeline, and the dual-valve linkage inert purging.

[0062] The operational results show that the traditional sampling structure is unsuitable for the high adhesion, easy agglomeration, high wear, and high-pressure explosion-proof characteristics of coal-biomass mixtures. Sampling is prone to clogging, has poor representativeness, lacks graded stable pressure reduction and inertial protection, and the co-gasification reaction efficiency has decreased by 4% instead of improving. The continuous stable operation time of the gasifier has been shortened by 260 hours instead of extending, tar production has increased by 10% instead of decreasing, raw material utilization has decreased by 3% instead of improving, and the frequency of unplanned shutdowns has increased significantly. Pipeline wear and material blockage occur frequently, posing significant safety hazards and failing to meet the production requirements of long-term, stable, and intelligent operation of the co-gasification unit.

[0063] As can be seen from the embodiments and comparative examples, by using the sampling device described in this invention to detect in real time the lower heating value, total moisture, dry ash-free volatile matter content, ash flow temperature, and alkali metal content of the mixture in the coal and biomass co-gasification process, and to adjust the biomass co-combustion ratio in the co-gasification process in a timely manner based on the obtained information, the co-gasification reaction efficiency is further improved by 8%-15%, the continuous stable operation time of the gasifier is extended by 300-800 hours, the tar generation is reduced by 12%-20%, the raw material utilization rate is improved by 5%-10%, and the frequency of unplanned shutdowns is effectively reduced (to ≤1 time per year). The sampling device features a simple structural design and standardized operation steps. Equipped with a pressure relief port, multi-stage shut-off valves, and other maintenance structures, it facilitates device handover, maintenance, and troubleshooting. Supporting dual-mode sampling, it adapts to different enterprise equipment configurations and co-gasification process conditions, eliminating the need for large-scale modifications to existing co-gasification devices and facilitating industrial-scale application. Furthermore, by employing the sampling device described in this invention, the intelligence level of co-gasification can be further enhanced, promoting the upgrading of the co-gasification process. It achieves integrated and intelligent sampling, detection, and process control of co-gasification mixtures, laying a technical foundation for intelligent control of biomass co-firing ratios and significantly improving the intelligence level and overall industry competitiveness of biomass and coal co-gasification devices.

[0064] 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 combining the 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 sampling device suitable for high-pressure dense-phase conveying conditions, characterized in that, The sampling device includes a delivery pipeline and an inlet component (1) and an outlet component located at both ends of the delivery pipeline; The inlet component (1) is curved and has several openings on its tube wall, so that the material to be tested can enter the conveying pipeline through the openings. The middle part of the delivery pipeline is provided with a purging component (2) for purging the delivery pipeline; The lead-out component includes an enlarged diameter connecting part (3) and a pressure reducing pipe (4). The small diameter end of the enlarged diameter connecting part (3) is connected to the outlet end of the conveying pipeline, and the large diameter end is connected to the pressure reducing pipe (4).

2. The sampling device for high-pressure dense-phase transportation as described in claim 1, characterized in that, The pipeline at the connection between the delivery pipeline and the lead-out component is curved; Preferably, the bending radius of the pipeline at the connection between the conveying pipeline and the enlarged diameter connection (3) is 9-12 times the pipeline diameter.

3. The sampling device suitable for high-pressure dense-phase transportation conditions according to claim 1 or 2, characterized in that, The delivery pipeline is also equipped with a first shut-off valve (5) and a second shut-off valve (6); and / or The purging component (2) is disposed between the first shut-off valve (5) and the second shut-off valve (6).

4. The sampling device suitable for high-pressure dense-phase transportation conditions according to any one of claims 1-3, characterized in that, The pressure-reducing pipe (4) is a flanged connection pipe with an inner diameter ≤ 20 mm; and / or The flange connecting pipe is internally equipped with a ceramic component, the length of which is greater than 1 meter; and / or The ceramic component is made of alumina corundum ceramic.

5. A method for co-gasification of coal and biomass, the method comprising: The mixture of coal and biomass is transported to the gasification unit through a material delivery pipeline for gasification reaction. The characteristic feature is that the inlet component (1) of the sampling device described in any one of claims 1-4 is inserted into the material delivery pipeline for sampling and transported to the detection device to detect the lower heating value, total moisture, dry ash-free volatile matter content, ash flow temperature and alkali metal content of the mixture.

6. The method according to claim 5, characterized in that, The biomass content in the mixture is 5-50 wt%; Preferably, the weight content of biomass in the mixture is adjusted according to the lower heating value, total moisture content, dry ash-free volatile matter content, ash flow temperature, and alkali metal content of the mixture, so that the lower heating value of the mixture is 16.5-19.5 MJ / kg, the ash flow temperature is 1300-1420℃, the total alkali metal content is 1.5wt%-3.0wt%, the total moisture content entering the furnace is 10wt%-16wt%, and the dry ash-free volatile matter content is 30wt%-40wt%.

7. The method according to claim 5 or 6, characterized in that, The sampling method of the sampling device includes: closing the first shut-off valve (5), opening the second shut-off valve (6), and using the purging component (2) to purge the delivery pipeline; The first shut-off valve (5) is opened, and the mixture is transported to the conveying pipeline through the opening provided on the inlet component (1) by pressure difference. Then, it is depressurized by the expansion connection (3) and the pressure reducing pipe (4) and then transported to the detection device for detection.

8. The method according to claim 7, characterized in that, The mixture is depressurized to 0.5-1.5 MPa through the expanded diameter connection (3), and then depressurized to 0.05-0.2 MPa through the depressurization pipe (4).

9. The method according to claim 8, characterized in that, Prior to sampling using the sampling device, the pressure and flow rate of the mixture within the material delivery pipeline are monitored; Preferably, the pressure of the mixture is 2-5 MPa, and the flow rate of the mixture is 3-15 t / h.

10. The method according to any one of claims 5-9, characterized in that, The method further includes: returning the detected material from the detection device and transporting it to the gasification device for gasification reaction through the material delivery pipeline.

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