Biomass material fluidization feeding device and feeding method thereof

Abstract

The invention provides a biological plasmid material fluidization feeding device and a feeding method thereof, and belongs to the technical field of biomass thermal conversion. The biological plasmid material fluidization feeding device comprises a fluidization material bin, a gas distributor and a blanking pipe. Wherein the fluidization stock bin is suitable for fluidizing and drying the biological plasmid material by utilizing waste heat tail gas from a chemical plant area. The gas distributor is arranged at the lower end of the fluidization stock bin and is suitable for conveying waste heat tail gas to the fluidization stock bin. And the blanking pipe is communicated with the middle lower end of the fluidization stock bin, and is suitable for conveying the dried biological plasmid material into the biomass gasification furnace. Wherein the biomass pellet material is gasified in the biomass gasification furnace to generate synthesis gas, and the pressure in the fluidization stock bin is greater than that in the biomass gasification furnace, so that the synthesis gas is prevented from flowing back to the fluidization stock bin through the blanking pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of biomass thermal conversion, and particularly relates to a biomass pellet fluidization feeding device and a feeding method thereof. BACKGROUND

[0002] Biomass gasification technology is a high-efficiency and clean solid fuel thermal conversion utilization method, and has a wide application in the field of green renewable energy utilization such as biomass, but there are still prominent problems in fuel adaptability, feeding stability and safety.

[0003] The biomass raw material used in the biomass gasification process has the characteristics of high moisture content, high viscosity and high fiber content, which makes the feeding device prone to blockage and bonding. Even if the moisture or viscosity of the biomass raw material is slightly larger, it may also cause accumulation at the feeding side of the biomass gasification furnace, thereby causing uneven fluidization of the biomass gasification furnace, coking, and a series of problems such as overload and stop of the feeding device.

[0004] Reducing the moisture content and viscosity of the biomass raw material and improving its flow performance through drying means is one of the effective ways to achieve stable feeding. However, the simple method of separating the conventional drying equipment from the feeding device will increase the energy consumption and complexity of the biomass gasification system. In addition, the sealing of the traditional mechanical feeding device is insufficient, and it is difficult to prevent the backflow of synthesis gas in the furnace of the biomass gasification furnace.

[0005] The backflow of synthesis gas in the furnace not only further aggravates the problem of poor feeding, but also leads to uneven gasification reaction in the biomass gasification furnace, poor synthesis gas quality, and low energy utilization efficiency of the system. More importantly, the mechanical feeding method lacks effective monitoring and control means for the backflow of synthesis gas, which may cause serious safety hazards.

[0006] With the development of biomass gasification furnace equipment towards large-scale, combined with the deterioration of biomass raw materials, the above problems become more prominent. Frequent shutdown for maintenance not only reduces production efficiency, but also increases overall operating cost. SUMMARY

[0007] In view of the above technical problems, the present application provides a biomass pellet fluidization feeding device and a feeding method thereof, in order to at least partially solve the above technical problems, and thus the specific technical solutions provided by the present application are as follows.

[0008] According to an embodiment of one aspect of the present application, a biomass pellet fluidization feeding device is provided, comprising: a fluidized bin, a gas distributor and a drop pipe.

[0009] Among them, the fluidized bin is suitable for fluidizing and drying biomass pellets by using waste heat tail gas from a chemical plant area.

[0010] The gas distributor is arranged at the lower end of the fluidized bin and is suitable for conveying the waste heat tail gas to the fluidized bin.

[0011] The dropping pipe is connected with the lower end of the fluidized bin and is suitable for conveying the dried biomass granules to the biomass gasification furnace.

[0012] The pressure in the fluidized bin is greater than the pressure in the biomass gasification furnace to prevent the synthesis gas from flowing back to the fluidized bin through the dropping pipe.

[0013] According to the embodiment of the present application, the biomass granule fluidized feeding method comprises the following steps: conveying the waste heat tail gas from the chemical plant area to the fluidized bin through the gas distributor, fluidizing and drying the biomass granules in the fluidized bin through the waste heat tail gas, and conveying the dried biomass granules to the biomass gasification furnace through the dropping pipe.

[0014] In the embodiment of the present application, the fluidized drying and feeding functions are integrated, the waste heat tail gas from the chemical plant area is used to fluidize and dry the biomass granules, the waste heat resource is recycled, the additional energy consumption and structural complexity of the feeding device are reduced, the moisture content and viscosity of the biomass granules are effectively reduced, the flow performance of the biomass granules is improved, the problems of the feeding device blockage and adhesion and the biomass gasification furnace feeding side accumulation caused by the high moisture and high viscosity of the biomass granules are solved from the root, and the feeding stability is ensured. Meanwhile, the pressure in the fluidized bin is controlled to be higher than the pressure in the biomass gasification furnace, an effective pressure barrier is formed, the synthesis gas in the biomass gasification furnace is prevented from flowing back to the fluidized bin through the dropping pipe, the problems of backfire, uneven reaction and poor synthesis gas quality caused by the backflow of the synthesis gas are avoided, and the safety hidden danger is eliminated. The biomass granule fluidized feeding device (hereinafter referred to as the feeding device) provided by the present application has a simple overall structure, reliable operation, adapts to the poor quality of the biomass granules and the large-scale development of the biomass gasification furnace, reduces the shutdown and maintenance frequency, significantly improves the production efficiency and reduces the operation cost. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a structural schematic diagram of a biomass granule fluidized feeding device in an embodiment of the present application;

[0016] Figure 2 FIG. 2 is a structural schematic diagram of a biomass granule fluidized feeding device in another embodiment of the present application;

[0017] Figure 3 FIG. 3 is a structural schematic diagram of a biomass granule fluidized feeding device in still another embodiment of the present application.

[0018] Legend of reference signs:

[0019] 1 - fluidization bin; 101 - waste heat tail gas outlet; 102 - pressure accumulator valve; 103 - pressure gauge; 104 - discharge port; 105 - overflow port;

[0020] 2 - gas distributor;

[0021] 3 - drop tube; 301 - first vertical tube section; 302 - inclined tube section; 303 - horizontal tube section; 304 - second vertical tube section;

[0022] 4 - biomass gasifier;

[0023] 5 - fluidizing air pipe;

[0024] 6 - conveying air pipe;

[0025] 7 - waste heat tail gas conveying line; 701 - flow meter;

[0026] 8 - cyclone; 801 - return pipe. DETAILED DESCRIPTION

[0027] Hereinafter, embodiments of the present application will be described with reference to the accompanying drawings. It is to be understood, however, that these descriptions are merely exemplary and are intended to illustrate the scope of the present application, not to limit it. In the following detailed description of the embodiments, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to one skilled in the art that one or more embodiments of the present application can be practiced without these specific details. In other instances, well-known structures and functions have been described in detail in order to avoid obscuring aspects of the present application.

[0028] The terms used herein are merely used to describe specific embodiments and are not intended to limit the present application. The term "include" used herein indicates the presence of a feature, step, operation, but does not exclude the presence or addition of one or more other features.

[0029] In the case of using an expression such as "at least one of A, B, and C", it is generally to be understood that the expression is used to indicate only one of A, B, or C, or any combination of A, B, and C (e.g., the system "having at least one of A, B, and C" should include, but not be limited to, a system having A alone, a system having B alone, a system having C alone, a system having both A and B, a system having both A and C, a system having both B and C, and / or a system having A, B, and C, etc.). In the case of using an expression such as "at least one of A, B, or C", it is generally to be understood that the expression is used to indicate only one of A, B, or C, or any combination of A, B, and C (e.g., the system "having at least one of A, B, and C" should include, but not be limited to, a system having A alone, a system having B alone, a system having C alone, a system having both A and B, a system having both A and C, a system having both B and C, and / or a system having A, B, and C, etc.).

[0030] In the process of implementing the inventive concept, it is found that the prior art has made some improvements on the problems of blockage, gas backflow, and easy adhesion of biomass raw materials with high moisture content in the biomass feeding device, but still has many defects.

[0031] To solve the problem of easy blockage of traditional mechanical feeding, the prior art uses mechanical vibration or stirring to improve the flow and conveying characteristics of biomass raw materials, but it does not fundamentally solve the problem of arching caused by high fiber content, irregular particle size, and high humidity. It also has the disadvantages of increased equipment wear, high safety risk, and insufficient long-term reliability.

[0032] To suppress the backflow and backfire of synthesis gas in the biomass gasifier, the prior art uses mechanical valves for blocking, but the mechanical parts are easy to jam, resulting in poor blocking effect. Another technology uses a closed hopper to increase the gas pressure in the intermediate bin to achieve blocking, but the multi-stage hopper design increases equipment investment and causes intermittent large fluctuations in the pressure of the biomass gasification system.

[0033] To address the problem of high moisture content and easy adhesion of biomass raw materials, the prior art integrates a microwave drying module in the feeding device for drying and preheating, but it has complex equipment, high investment and operating costs, and is not suitable for processing low-value and poor-quality biomass raw materials. Another technology uses a closed hopper to detect the humidity and intermittently start a hot air dryer for drying. This not only causes large pressure disturbances in the biomass gasification system, but also increases the energy consumption and operating cost of the system due to the addition of a hot air dryer.

[0034] In summary, the current biomass feeding-related technologies generally have the defects of complex equipment, high risk of gas backflow and backfire, high energy consumption and maintenance cost, and are difficult to meet the needs of continuous and controllable operation in the gasification process.

[0035] Based on this, the present application provides a biomass pellet fluidized feeding device, which aims to solve the many shortcomings of the prior art through integrated design and waste heat utilization, and to improve the efficiency and economy of biomass energy conversion.

[0036] Figure 1 Figure 1 is a structural schematic diagram of a biomass pellet fluidized feeding device according to an embodiment of the present application; Figure 2 Figure 2 is a structural schematic diagram of a biomass pellet fluidized feeding device according to another embodiment of the present application; Figure 3 Figure 3 is a structural schematic diagram of a biomass pellet fluidized feeding device according to still another embodiment of the present application.

[0037] As a first aspect of the present application, a biomass pellet fluidized feeding device is provided, as shown in Figures 1-3 which includes a fluidized bin 1, a gas distributor 2, and a material falling pipe 3.

[0038] The fluidized bin 1 is suitable for fluidizing and drying the biomass pellets by using the waste heat tail gas from the chemical plant area.

[0039] The gas distributor 2 is arranged at the lower end of the fluidized bin 1 and is suitable for conveying the waste heat tail gas to the fluidized bin 1.

[0040] The dropping pipe 3 is connected to the lower end of the fluidized bin 1 and is suitable for conveying the dried biomass pellets into the biomass gasifier 4.

[0041] The pressure in the fluidized bin 1 is greater than the pressure in the biomass gasifier 4, so as to prevent the synthesis gas from flowing back to the fluidized bin 1 through the dropping pipe 3.

[0042] In the embodiment, the gas distributor 2 is arranged at the lower end of the fluidized bin 1, and the waste heat tail gas from the chemical plant area can be uniformly sent into the fluidized bin 1. The fluidized drying function of the fluidized bin 1 is integrated, which can efficiently reduce the moisture and viscosity of the biomass pellets and improve the flow performance of the biomass pellets by using the waste heat, and can avoid the problems of blockage of the dropping pipe and accumulation of the biomass gasifier due to high humidity and viscosity of the biomass raw materials. In addition, the additional drying equipment is saved, and the energy consumption and complexity of the biomass gasification system are reduced. The dropping pipe 3 is connected to the lower end of the fluidized bin 1, and the fluidized and dried biomass pellets can be smoothly conveyed, so as to ensure the continuity of the feeding. At the same time, by controlling the pressure in the fluidized bin 1 to be higher than the pressure in the biomass gasifier 4, an effective pressure barrier is formed. By combining the structural design and pressure control, the synthesis gas in the biomass gasifier 4 is completely prevented from flowing back through the dropping pipe 3, and the problems of backfire, uneven reaction and safety hazards caused by backflow are avoided. The biomass pellet fluidized feeding device provided by the present application has high overall adaptability, can improve the stability and economy of the biomass gasification system, and meets the continuous operation requirement.

[0043] It should be understood that the structure of the gas distributor 2 can be flexibly selected according to the specific structure of the fluidized bin 1, for example, a ring-shaped air distribution plate, a multi-hole sieve plate type air distributor, a bubble cap type air distributor, etc. The person skilled in the art can reasonably select according to the actual fluidization requirements and the structure characteristics of the fluidized bin, and the present application does not limit this.

[0044] In some embodiments, as shown in Figures 1-3 The waste heat tail gas outlet 101 is provided with a pressure accumulation valve 102, the pressure in the fluidized bin 1 is monitored by the pressure gauge 103, and the pressure in the fluidized bin 1 is adjusted by the opening degree of the pressure accumulation valve 102, so that the pressure in the fluidized bin 1 is greater than the pressure in the biomass gasifier 4.

[0045] In some specific embodiments, as shown in Figure 2As shown, pressure gauges 103 are arranged at different positions of the fluidized bin 1, and the pressure gauges 103 are in linkage control relationship with the pressure storage valve 102. The pressure data at different positions in the fluidized bin 1 are monitored in real time through the pressure gauges 103, and then the opening degree of the pressure storage valve 102 is adjusted in linkage, so that the real-time and accurate regulation and control of the pressure in the fluidized bin 1 is realized, and it is ensured that the pressure in the fluidized bin 1 is always higher than the pressure in the biomass gasifier 4, thereby preventing the backflow of the synthesis gas and stabilizing the fluidization and drying effect.

[0046] In the embodiment of the present application, the residual heat tail gas outlet 101 and the pressure storage valve 102 are arranged at the top end of the fluidized bin 1, and the pressure gauges 103 are arranged at the top end and different positions, so as to form an accurate pressure regulation system. The pressure gauges 103 monitor the pressure in the fluidized bin 1 (including the pressure distribution at different positions) in real time, and after linkage with the pressure storage valve 102, the pressure in the fluidized bin 1 can be dynamically regulated and controlled by adjusting the opening degree of the pressure storage valve 102, so as to ensure that it is always higher than the pressure in the biomass gasifier 4. The structure design not only effectively blocks the backflow path of the synthesis gas through the feeding pipe 3 by the pressure difference, eliminates the safety hidden danger of backfire, but also stabilizes the fluidization environment in the fluidized bin 1, and ensures the continuous and efficient effect of the residual heat tail gas on the fluidization and drying process.

[0047] It should be understood that the biomass particles are added from the top of the fluidized bin 1, and the specific adding mode and related matching structure can be flexibly selected according to the fluidization requirements of the actual working condition and the structural characteristics of the fluidized bin, and the present application does not make special limitation thereon.

[0048] In some embodiments, as shown in Figure 1 or Figure 3 The feeding pipe 3 is connected in communication with the biomass gasifier 4 through the discharge port 104 at the bottom of the fluidized bin 1. Figure 2 As shown, the feeding pipe 3 is connected in communication with the biomass gasifier 4 through the overflow port 105 opened in the side wall of the dense phase zone of the fluidized bin 1.

[0049] In the embodiment of the present application, the feeding pipe 3 is connected in communication with the biomass gasifier 4 through the discharge port 104 at the bottom of the fluidized bin 1, so that the biomass particles can be smoothly discharged by the action of gravity, and the accumulation and blockage of the biomass particles at the bottom of the fluidized bin 1 are avoided. When connected through the overflow port 105 in the side wall of the dense phase zone, the biomass particles in the dense phase zone which are fully fluidized and uniformly dried can be accurately taken, which is consistent with the structural characteristics of the stable particle mixing in the dense phase zone. The two connection modes can adapt to different working condition requirements, which not only ensures the continuity and uniformity of feeding, but also avoids the adhesion or accumulation of biomass particles due to unreasonable conveying path, so as to provide stable and adaptive biomass raw materials for the biomass gasifier 4, and further improve the operation reliability and adaptability of the entire biomass gasification system.

[0050] In some embodiments, as shown in Figures 1-3As shown, the blanking pipe 3 comprises: a first vertical pipe segment 301, an inclined pipe segment 302, a horizontal pipe segment 303, and an optional second vertical pipe segment 304 connected in sequence. The included angle between the first vertical pipe segment 301 and the inclined pipe segment 302 is 150°-180°, for example, it can be: 150°, 160°, 170°, 180°. The length of the horizontal pipe segment 303 is 2.1-6.0 times the diameter of the horizontal pipe segment 303, for example, it can be: 2.1 times, 3 times, 4 times, 5 times, 6 times.

[0051] In the embodiment of the present application, the blanking pipe 3 adopts a segmented connection structure, and the reasonable pipe segment included angle can reduce the flow resistance of the biomass granules in the blanking pipe 3, reduce the retention and sticking phenomenon, and effectively avoid the risk of blockage.

[0052] In some embodiments, as shown in Figure 3 As shown, when the biomass gasifier 4 is a biomass circulating fluidized gasifier, the biomass circulating fluidized gasifier comprises a cyclone separator 8. At this time, the blanking pipe 3 is in communication with the return pipe 801 of the cyclone separator 8, and the blanking pipe 3 further comprises a second vertical pipe segment 304 to adapt to the return system of the biomass circulating fluidized gasifier, and ensure the coordination of the biomass raw material conveying and the circulating fluidization in the furnace.

[0053] In some embodiments, as shown in Figures 1-3 As shown, the biomass granule fluidized feeding device further comprises: a loosening air pipe 5 arranged at the connection of different pipe segments of the blanking pipe 3, and the direction of the loosening air in the loosening air pipe 5 is consistent with the conveying direction of the biomass granules, so that the biomass granules are in a fluidized state in the blanking pipe 3, and at the same time, the synthetic gas is prevented from being backflowed to the fluidized bin 1 through the blanking pipe 3.

[0054] Specifically, the loosening air pipe 5 can be arranged at the connection of the first vertical pipe segment 301 and the inclined pipe segment 302, and the axis of the loosening air pipe 5 coincides with the axis of the inclined pipe segment 302. The loosening air pipe 5 can be arranged at the connection of the inclined pipe segment 302 and the horizontal pipe segment 303, and the axis of the loosening air pipe 5 coincides with the axis of the horizontal pipe segment 303. In addition, the loosening air pipe 5 can be arranged at the connection of the horizontal pipe segment 303 and the second vertical pipe segment 304, and the axis of the loosening air pipe 5 coincides with the axis of the second vertical pipe segment 304.

[0055] The loosening air adopts the waste heat tail gas of the chemical plant area. The wind speed of the loosening air is 0.1-0.2 m / s, for example, it can be: 0.1 m / s, 0.15 m / s, 0.2 m / s.

[0056] In this embodiment of the invention, by setting loosening air ducts 5 at the connection points of different pipe sections of the feed pipe 3, with the axis of the loosening air duct 5 coinciding with the axis of the corresponding pipe section and the direction of the loosening air consistent with the direction of biomass pellet conveying, and by using waste heat exhaust gas from the chemical plant area as the loosening air, the biomass pellets in the feed pipe 3 are kept in a fluidized state, avoiding stagnation and adhesion at the pipe section connection points and preventing conveying blockages; a pressure barrier is also formed to further block the backflow path of syngas, improving the safety of the biomass gasification system; and the waste heat can be reused, which is in line with the overall energy-saving design and greatly improves the stability and reliability of the feeding device.

[0057] In some embodiments, such as Figures 1-3 As shown, the biomass pellet fluidized feeding device also includes: a conveying air pipe 6, which is set at the connection between the discharge pipe 3 and the biomass gasifier 4. The direction of the conveying air in the conveying air pipe is consistent with the conveying direction of the biomass pellets, so that the biomass pellets are evenly distributed in the furnace of the biomass gasifier 4, while preventing the syngas from flowing back into the fluidized silo 1 through the discharge pipe 3.

[0058] Specifically, when the horizontal pipe section 303 is connected to the biomass gasifier 4, the conveying air duct 6 is located at the connection between the horizontal pipe section 303 and the biomass gasifier 4, and the axis of the conveying air duct 6 coincides with the axis of the horizontal pipe section 303. When the second vertical pipe section 304 is connected to the biomass gasifier 4, the conveying air duct 6 is located at the connection between the second vertical pipe section 304 and the biomass gasifier 4, and the axis of the conveying air duct 6 coincides with the axis of the second vertical pipe section 304.

[0059] The conveying air utilizes waste heat from the chemical plant area. The air velocity of the conveying air is 10-30 m / s, for example: 10 m / s, 15 m / s, 20 m / s, 25 m / s, 30 m / s.

[0060] In this embodiment of the invention, a conveying air duct 6 is installed at the connection between the feed pipe 3 and the biomass gasifier 4, and the direction of the conveying air is consistent with the direction of biomass pellet conveying. At the same time, the waste heat exhaust gas from the chemical plant area is used as the conveying air. The conveying air can push the biomass pellets into the furnace of the biomass gasifier 4 evenly and disperse them, ensuring that the gasification reaction is sufficient and efficient. Its airflow can form an additional barrier to further prevent the synthesis gas from backflowing through the feed pipe 3, thereby enhancing the safety of the biomass gasification system. The reuse of waste heat exhaust gas also fits the overall energy-saving design, improving the synergy between the feeding and gasification processes and the system economy.

[0061] In some embodiments, such as Figures 1-3As shown, the waste heat tail gas of the chemical plant area is transported to the gas distributor 2, the loosening air pipe 5 and the conveying air pipe 6 through the waste heat tail gas conveying pipeline 7, and a plurality of flow meters 701 are arranged on the waste heat tail gas conveying pipeline 7 to monitor and control the conveying air volume of each waste heat tail gas. Exemplarily, the waste heat tail gas temperature is 80-200℃, which can not only fully meet the fluidized drying needs of the biomass granules, effectively reduce the moisture and viscosity of the biomass granules, but also will not cause pyrolysis and deterioration of the biomass granules due to too high temperature.

[0062] In the embodiment of the present application, the centralized supply design of the waste heat tail gas conveying pipeline 7 realizes efficient reuse of the waste heat tail gas, provides stable gas source for fluidized drying, biomass granule loosening and conveying; the plurality of flow meters can accurately monitor and control the air volume of each tail gas, ensure that the fluidized drying effect of the gas distributor 2, the anti-blocking and anti-backflow effect of the loosening air pipe 5 and the uniform material distribution function of the conveying air pipe 6 are all in the optimal working condition, guarantee the collaborative operation of each component, and greatly improve the operation stability, control accuracy and energy utilization efficiency of the feeding device.

[0063] As a second aspect of the present application, a biomass granule fluidized feeding method is provided, comprising: conveying the waste heat tail gas from the chemical plant area into the fluidized bin 1 through the gas distributor 2, fluidizing and drying the biomass granules in the fluidized bin 1 by the waste heat tail gas, and conveying the dried biomass granules along the material falling pipe 3 into the biomass gasifier 4.

[0064] In the embodiment of the present application, the waste heat tail gas of the chemical plant area is introduced into the fluidized bin 1 through the gas distributor 2, and the fluidized drying of the biomass granules is realized by using the waste heat tail gas. The dried biomass granules are conveyed to the biomass gasifier 4 through the material falling pipe, which, in combination with the gas distribution structure of the gas distributor 2 and the fluidized space of the fluidized bin 1, not only efficiently utilizes the waste heat to reduce the moisture and viscosity of the biomass granules and solves the conveying blockage problem, but also saves additional drying energy. The conveying path design of the material falling pipe 3 cooperates with the characteristics of the fluidized biomass granules to ensure continuous and stable feeding. The overall method cooperates with the structure of the feeding device to realize the integration of drying, feeding and waste heat utilization, and improves the operation efficiency and economy of the biomass gasification system.

[0065] In summary, the present application aims to overcome the defects of uneven feeding, easy clogging, low energy utilization rate and difficult control existing in the prior art biomass feeding technology, and provides a biomass pellet fluidized feeding device and a corresponding feeding method. The fluidized drying function is integrated in the feeding device to realize the cooperation of biomass pellet pretreatment and stable conveying, and at the same time, the recycling of waste heat tail gas in the chemical plant area is achieved, finally the operation stability and energy utilization efficiency of the biomass gasification system are improved. The technical scheme is as follows: the waste heat tail gas of 80-200 DEG C is used as the gas source of the fluidized bin, which not only reduces the waste heat emission and improves the energy utilization efficiency, but also dries and preheats the biomass pellets, reduces the adhesion, and improves the flow and reaction performance. According to the hearth pressure of the biomass gasification furnace, the pressure in the fluidized bin is controlled in real time by adjusting the opening degree of the pressure accumulation valve, the backflow of synthesis gas in the hearth of the biomass gasification furnace is effectively avoided, and the interlocking control level of the biomass gasification system is improved. A plurality of loosening air pipes are arranged at the connection positions of different pipe sections of the feeding pipe to ensure that the biomass pellets flow downward in a fluidized state, reduce the clogging in the feeding pipe, and ensure the stable feeding. A conveying air pipe is arranged at the connection position of the feeding pipe and the biomass gasification furnace to realize the uniform distribution of the biomass pellets in the hearth of the biomass gasification furnace by means of appropriate air speed. The whole has the technical advantages of high equipment integration, convenient operation and high energy utilization efficiency.

[0066] The above specific embodiments further illustrate the purpose, technical scheme and beneficial effects of the present application, and it should be understood that the above description is only for specific embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A biomass pellet fluidizing feeding device, characterized in that, The application relates to a biomass particle fluidization feeding device. The biomass particle fluidization feeding device comprises: a fluidization bin suitable for fluidizing and drying biomass particles by using waste heat tail gas from a chemical plant area; a gas distributor arranged at the lower end of the fluidization bin and suitable for conveying the waste heat tail gas to the fluidization bin; and a drop tube communicating with the lower end of the fluidization bin and suitable for conveying the dried biomass particles into the biomass gasifier.

2. The biomass pellet fluidizing feeder apparatus according to claim 1, wherein, The pressure in the fluidization bin is greater than that in the biomass gasifier to prevent the backflow of synthesis gas from the biomass gasifier to the fluidization bin through the drop tube.

3. The biomass pellet fluidizing feeder apparatus according to claim 1, wherein, The top end of the fluidization bin is provided with a waste heat tail gas outlet and a pressure gauge, the waste heat tail gas outlet is provided with a pressure storage valve, the pressure in the fluidization bin is monitored by the pressure gauge and adjusted by the opening degree of the pressure storage valve, so that the pressure in the fluidization bin is greater than that in the biomass gasifier. The drop tube communicates with the biomass gasifier through a discharge port at the bottom of the fluidization bin; or 4. The biomass pellet fluidizing feeder apparatus according to claim 1, wherein, The drop tube communicates with the biomass gasifier through an overflow port formed in the side wall of the dense phase zone of the fluidization bin. The drop tube comprises:

5. The biomass pellet fluidizing feeder apparatus according to claim 4, wherein, a first vertical tube section, an inclined tube section, a horizontal tube section and an optional second vertical tube section connected in sequence. The included angle between the first vertical tube section and the inclined tube section is 150-180 degrees.

6. The biomass pellet fluidizing feeder apparatus according to claim 2, wherein, The length of the horizontal tube section is 2.1-6.0 times the diameter of the horizontal tube section. The biomass particle fluidization feeding device further comprises:

7. The biomass pellet fluidizing feeder apparatus according to claim 6, wherein, a loosening air pipe arranged at the connection of different tube sections of the drop tube, the direction of loosening air in the loosening air pipe is consistent with the conveying direction of the biomass particles, so that the biomass particles are in a fluidized state in the drop tube, and the backflow of synthesis gas from the biomass gasifier to the fluidization bin through the drop tube is prevented. The loosening air adopts waste heat tail gas from the chemical plant area.

8. The biomass pellet fluid feeding apparatus according to claim 2, wherein The wind speed of the loosening air is 0.1-0.2 m / s. The biomass particle fluidization feeding device further comprises:

9. The biomass pellet fluidizing feeder apparatus according to claim 8, wherein, a conveying air pipe arranged at the connection of the drop tube and the biomass gasifier, the direction of conveying air in the conveying air pipe is consistent with the conveying direction of the biomass particles, so that the biomass particles are uniformly distributed in the hearth of the biomass gasifier, and the backflow of synthesis gas from the biomass gasifier to the fluidization bin through the drop tube is prevented. The conveying air adopts waste heat tail gas from the chemical plant area.

10. A method of fluid feeding a stream of biomass pellets, characterized by, The wind speed of the conveying air is 10-30 m / s. The biomass particle fluidization feeding device comprises: conveying waste heat tail gas from a chemical plant area into a fluidization bin through a gas distributor, fluidizing and drying biomass particles in the fluidization bin by the waste heat tail gas, and conveying the dried biomass particles into a biomass gasifier along a drop tube.

Images