Biomass steam heating high-efficiency purification system

Abstract

The utility model provides a kind of biomass steam heating efficient purification system, it is related to biomass steam pickling purification technical field.A kind of biomass steam heating efficient purification system includes biomass combustion furnace, steam generation module, pickling reaction tank and intelligent control unit, the steam generation module includes steam generator, steam pipeline and steam booster pump, the biomass combustion furnace is connected with the steam generator, the outlet of the steam generator is connected with steam pipeline, steam booster pump is equipped on the steam pipeline, pressurized steam is directionally imported from the pickling reaction tank bottom, the pickling reaction tank inner wall is equipped with several guide ribs, several guide ribs are distributed along the pickling reaction tank inner wall and are relatively the axis of the pickling reaction tank Inclined arrangement, the intelligent control unit is used for dynamically adjusting steam flow.The system is through biomass steam directional pressurization+guide rib auxiliary synergistic elimination dead zone, improves pickling efficiency and effect, substantially reduces strong acid consumption, reduces energy consumption, realizes the closed circuit circulation of high acid liquid reuse rate.

Description

Technical Field

[0001] This utility model relates to the field of biomass steam acid washing and purification technology, and more specifically, to a high-efficiency purification system for biomass steam heating. Background Technology

[0002] In the process of biomass processing, raw materials usually need to be acid-washed and purified. At present, cylindrical acid washing tanks are widely used in industry to acid wash biomass raw materials. However, the acid washing process of the cylindrical acid washing tank currently used has the following defects: (1) Low thermal efficiency: Traditional electric heating or gas heating has high energy consumption and poor temperature uniformity (standard deviation > 5℃); (2) Uneven flow field: It leads to uneven mixing or dispersion of various media in the acid washing tank, resulting in low acid washing efficiency and affecting product quality. Specifically: a. Central axis symmetrical dead zone: In traditional stirring or static flow field, laminar flow zone is formed near the central axis due to the velocity gradient approaching zero, and impurities are easy to deposit (such as silicate agglomeration in the acid washing of natural graphite). b. Edge inefficient zone: The fluid in the boundary layer of the tank wall is affected by viscous resistance, and the flow velocity drops sharply, resulting in insufficient flushing effect. c. Axial / radial mixing imbalance: Traditional paddle stirring is mainly radial flow, and the material lacks axial flow. (3) Poor environmental performance: In order to achieve the effect of pickling and removing impurities, a large amount of strong acid is consumed, and the cost of waste liquid treatment is high.

[0003] CN213866433U discloses a steam heating device for pickling, including a heating pool for heating acid solution and a pickling tank for pickling steel pipes. The heating pool is equipped with an acid-resistant coil, one end of which is connected to a steam furnace for supplying steam to the coil, and the other end of which extends outside the heating pool. By installing the acid-resistant coil inside the heating pool, heat exchange of the acid solution is facilitated, reducing the generation of acid mist. Connecting the coil to the steam furnace allows for heat release through steam condensation, and the resulting water droplets still carry significant heat, increasing the heat transferred within the coil. Extending the coil outside the pool prevents the condensed water droplets from entering the pool and mixing with the acid solution, thus maintaining a constant acid concentration while heating the solution. However, this design does not consider the adverse effects of laminar flow on the pickling effect, resulting in a poor final pickling result.

[0004] CN102502618A discloses an activated carbon pickling tank, comprising a cylindrical body with a liquid outlet at the bottom. A filter plate with perforations is disposed in the lower part of the cylindrical body, and a steam heating pipe connected to a steam source is disposed below the filter plate. The steam heating pipe has a gas outlet. Steam is introduced into the cylindrical body through the steam heating pipe to heat the material and accelerate the reaction rate. However, its pickling degree is limited and cannot further improve the pickling effect. Utility Model Content

[0005] The purpose of this invention is to provide a high-efficiency purification system for biomass steam heating, which eliminates dead zones through directional pressurization of biomass steam and the assistance of guide ribs, thereby improving pickling efficiency and effect, significantly reducing the amount of strong acid used, and lowering energy consumption.

[0006] This utility model is achieved through the following technical solution: A high-efficiency purification system for biomass steam heating includes a biomass combustion furnace, a steam generation module, an acid washing reaction tank, and an intelligent control unit. The steam generation module includes a steam generator, a steam pipeline, and a steam booster pump. The biomass combustion furnace is connected to the steam generator, and the outlet of the steam generator is connected to the steam pipeline. The steam booster pump is installed on the steam pipeline, and pressurized steam is directionally introduced from the bottom of the acid washing reaction tank. The inner wall of the acid washing reaction tank is provided with several flow guide ribs, which are distributed circumferentially along the inner wall of the acid washing reaction tank and inclined relative to the axis of the acid washing reaction tank. The intelligent control unit is used to dynamically adjust the steam flow rate.

[0007] Furthermore, the included angle α between the guide rib and the axis of the pickling reaction tank is 30°-60°.

[0008] Furthermore, the cross-section of the guide rib is arc-shaped.

[0009] Furthermore, the number of the guide ribs is 4-12, and they are evenly distributed at equal intervals on the inner wall of the pickling reaction tank.

[0010] Furthermore, the guide ribs are perpendicular to the inner wall of the pickling reaction vessel.

[0011] Furthermore, the spacing between adjacent guide ribs is 8-10% of the diameter of the pickling reaction tank, and the height of the guide ribs is 5-8% of the diameter of the pickling reaction tank.

[0012] Furthermore, the flow guide ribs are titanium alloy ribs, and the flow guide ribs are integrally formed with the inner wall of the pickling reaction tank.

[0013] Furthermore, the pickling reaction vessel is equipped with a stirring paddle.

[0014] The technical solution of this utility model has at least the following advantages and beneficial effects: In this invention, dead zones are eliminated through directional pressurization of biomass steam and the assistance of guide ribs. The inclined guide ribs transform the traditional vertical upward airflow into a spiral upward airflow along the tank wall, significantly increasing the airflow path within the tank. This prolongs the contact time between the gas and the medium, improving the pickling effect. The spiral airflow effectively disrupts the central airflow channel, avoiding "short-circuiting" and forcing the gas to distribute more evenly in both the radial and axial directions, ensuring full contact with the medium inside the tank. This greatly improves processing efficiency and significantly reduces the amount of strong acid used. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the biomass steam heating high-efficiency purification system provided in Embodiment 1 of this utility model; Figure 2 This is an internal top view of the pickling reaction vessel provided in Embodiment 1 of this utility model; Figure 3 This is a cross-sectional view of the pickling reaction vessel provided in Embodiment 1 of this utility model.

[0017] Icons: 1-Biomass combustion furnace, 2-Steam generator, 3-Steam pipeline, 4-Steam booster pump, 5-Acid washing reaction tank, 6-Guide ribs, 7-Agitator, 8-Intelligent control unit. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Example 1 Reference Figures 1-3 This embodiment provides a high-efficiency purification system for biomass steam heating, including a biomass combustion furnace 1, a steam generation module, an acid washing reaction tank 5, and an intelligent control unit 8. The steam generation module includes a steam generator 2, a steam pipe 3, and a steam booster pump 4. The biomass combustion furnace 1 is connected to the steam generator 2. The outlet of the steam generator 2 is connected to the steam pipe 3. The steam booster pump 4 is installed on the steam pipe 3. Pressurized steam is directionally introduced from the bottom of the acid washing reaction tank 5. The inner wall of the acid washing reaction tank 5 is provided with a plurality of flow guide ribs 6. The plurality of flow guide ribs 6 are distributed circumferentially along the inner wall of the acid washing reaction tank 5 and are inclined relative to the axis of the acid washing reaction tank 5. The intelligent control unit 8 is used to dynamically adjust the steam flow rate.

[0023] By directional pressurization of biomass steam and the assistance of guide ribs 6 to eliminate dead zones, the traditional vertical upward airflow is transformed into a spiral upward airflow along the tank wall through the inclined guide ribs 6. This significantly increases the airflow path within the tank, thereby extending the contact time between the gas and the medium, improving the pickling effect, achieving closed-loop circulation of the acid solution, and reducing steam energy consumption. This increases the acid reuse rate to 90% and reduces steam energy consumption to 1.05 kWh / kg. The spiral airflow effectively disrupts the central airflow channel, avoiding the "short circuit" phenomenon, and forces the gas to be more evenly distributed radially and axially, ensuring full contact with the medium inside the tank, greatly improving processing efficiency and significantly reducing the amount of strong acid used.

[0024] In a preferred embodiment, the angle α between the guide rib 6 and the axis of the pickling reaction tank 5 is 30°-60°. This angle range ensures that the airflow forms a stable and efficient spiral motion.

[0025] In a preferred embodiment, the cross-section of the guide rib 6 is arc-shaped. The arc-shaped cross-section reduces airflow resistance.

[0026] In a preferred embodiment, the number of guide ribs 6 is 4-12, and they are evenly distributed at equal intervals on the inner wall of the pickling reaction tank 5. Preferably, there are 6-8 ribs, and they are evenly distributed at equal intervals on the inner wall of the tank to ensure the formation of a stable and symmetrical spiral flow field.

[0027] In a preferred embodiment, the guide rib 6 is perpendicular to the inner wall of the pickling reaction tank 5.

[0028] In a preferred embodiment, the spacing between adjacent guide ribs 6 is 8-10% of the diameter of the pickling reaction tank 5, and the height of the guide ribs 6 is 5-8% of the diameter of the pickling reaction tank 5. This spacing range ensures the "tightness" of the airflow spiral, precisely balancing efficiency and energy consumption. This height ensures that the airflow forms a stable vortex at different flow velocities. Through the design of the spacing and height, it can be ensured that the airflow entering from the bottom of the tank is immediately "captured" by the guide ribs 6, completely eliminating the central short-circuit channel, forcing all gas to participate in the spiral motion, thereby accelerating pickling efficiency and improving pickling effect. Preferably, the diameter of the pickling reaction tank 5 is 2m, the height of the guide ribs 6 is 160mm, and the spacing between adjacent guide ribs 6 is 200mm.

[0029] In a preferred embodiment, the flow guide rib 6 is a titanium alloy rib, and the flow guide rib 6 is integrally formed with the inner wall of the pickling reaction tank 5. The integrally formed structure has high strength and low airflow resistance.

[0030] In a preferred embodiment, the pickling reaction tank 5 is equipped with an agitator 7. The agitator 7 primarily provides radial and axial mixing, ensuring the uniformity of concentration and temperature of the material within the tank (especially at the bottom and center), and preventing dead zones. The guide ribs 6 primarily optimize airflow distribution, organizing the turbulent flow generated by the agitator 7 into a regular spiral upward flow, extending gas residence time and preventing gas short-circuiting. The agitator 7 solves the solid settling and overall mixing problems that the guide ribs 6 cannot handle; the guide ribs 6 solve the problem of uneven airflow distribution in the agitator 7 system. They work together to achieve dual optimization of both the material and gas phases. The agitator 7 is driven by a motor (not shown in the figure). The intelligent control unit 8 dynamically adjusts the steam flow rate through a PID algorithm module.

[0031] During operation, the biomass combustion furnace 1, connected to the steam generator 2, produces steam at 150-200℃. This steam is transported via steam pipe 3 and pressurized to 1.5-2.5 barg by the steam booster pump 4 (breaking the traditional steam system limitation of <1 barg). The pressurized steam is then directionally introduced into the pickling reaction tank 5 from the bottom. Inside the pickling reaction tank 5, radial and axial mixing is provided by the agitator 7, ensuring uniformity of concentration and temperature of the material (especially at the bottom and center) and preventing dead zones. Simultaneously, guided by the guide ribs 6, the steam no longer rises vertically but is confined within the spiral channel formed by the guide ribs, moving upwards in a spiral motion. This spiral motion significantly increases the airflow path and turbulence, allowing the gas to fully and uniformly contact the material inside the tank for pickling (pickling temperature is 60℃-80℃), thus significantly improving pickling efficiency. Finally, the treated gas is discharged from the gas outlet at the top of the tank, and the acid solution is discharged from the drain port at the bottom of the tank. Pickling using this system can reduce pickling time from 8 hours to 5 hours, with residual impurities <0.05 ppm. The acid reuse rate is 92%, and the steam energy consumption is 1.05 kWh / kg.

[0032] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-efficiency purification system for biomass heated by steam, characterized in that: The system includes a biomass combustion furnace, a steam generation module, an acid washing reaction tank, and an intelligent control unit. The steam generation module includes a steam generator, a steam pipeline, and a steam booster pump. The biomass combustion furnace is connected to the steam generator, and the outlet of the steam generator is connected to the steam pipeline. The steam booster pump is installed on the steam pipeline, and pressurized steam is directionally introduced from the bottom of the acid washing reaction tank. The inner wall of the acid washing reaction tank is provided with several guide ribs, which are distributed circumferentially along the inner wall of the acid washing reaction tank and are inclined relative to the axis of the acid washing reaction tank. The intelligent control unit is used to dynamically adjust the steam flow rate.

2. The biomass steam heating high-efficiency purification system according to claim 1, characterized in that, The included angle α between the guide rib and the axis of the pickling reaction tank is 30°-60°.

3. The biomass steam heating high-efficiency purification system according to claim 2, characterized in that, The cross-section of the guide rib is arc-shaped.

4. The biomass steam heating high-efficiency purification system according to claim 1, characterized in that, The number of the guide ribs is 4-12, and they are evenly distributed at equal intervals on the inner wall of the pickling reaction tank.

5. The biomass steam heating high-efficiency purification system according to claim 1, characterized in that, The flow guide ribs are perpendicular to the inner wall of the pickling reaction tank.

6. The biomass steam heating high-efficiency purification system according to claim 1, characterized in that, The spacing between adjacent guide ribs is 8-10% of the diameter of the pickling reaction tank, and the height of the guide ribs is 5-8% of the diameter of the pickling reaction tank.

7. The biomass steam heating high-efficiency purification system according to claim 1, characterized in that, The flow guide ribs are made of titanium alloy and are integrally formed with the inner wall of the pickling reaction tank.

8. The biomass steam heating high-efficiency purification system according to claim 1, characterized in that, The pickling reaction tank is equipped with a stirring paddle.

9. The biomass steam heating high-efficiency purification system according to claim 1, characterized in that, The intelligent control unit includes a PID algorithm module.

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