A biomass roasting device

Abstract

This utility model relates to the field of biomass baking technology, specifically disclosing a biomass baking device, including a base plate and a baking tank. A flat plate is fixedly connected to the outer wall of the baking tank above the base plate. A high-efficiency exhaust gas treatment mechanism is provided above the base plate. The high-efficiency exhaust gas treatment mechanism includes a heat-conducting bend connected to the upper end of the baking tank. A condenser sleeve is provided on the outer wall of the heat-conducting bend. The lower and upper sides of the outer wall of the condenser sleeve are respectively connected to an inlet pipe and an outlet pipe. After cooling, the exhaust gas enters the filter box through a horizontal pipe to complete gas-solid separation. Then, it is pressurized by a gas pump and injected into an acid gas treatment box. The acid gas is neutralized by NaOH solution, thereby achieving the effect of deacidification of the exhaust gas. The exhaust gas is heated to the catalytic reaction temperature by a heating tube and an oxygen supply tube. At the same time, oxygen is injected into the oxygen supply tube, which promotes the oxidation of CO in the exhaust gas to CO and the decomposition of VOCs into CO and H2O, thereby facilitating the decomposition of organic matter such as CO and VOCs and achieving the complete harmless treatment of organic matter.

Description

Technical Field

[0001] This utility model relates to the field of biomass baking technology, and specifically discloses a biomass baking device. Background Technology

[0002] Biomass, a general term for renewable organic resources such as agricultural straw, forestry waste, and livestock manure, plays a vital role in alleviating the fossil fuel crisis and promoting a green circular economy through its efficient utilization. Pre-treatment of biomass by baking can reduce its moisture content, remove some volatiles, and increase its energy density through low-temperature pyrolysis (typically 200–300℃), making it more suitable for applications such as solid fuels, biochar production, and thermochemical conversion.

[0003] In existing technologies, harmful gases generated during biomass roasting are often treated using simple methods such as filtration and activated carbon adsorption. However, roasting exhaust gases contain not only organic pollutants such as CO and VOCs, but also acidic gases such as SO and HCl. Single treatment methods are insufficient to address this multi-component pollution problem, resulting in incomplete removal of various harmful substances from the exhaust gases. Therefore, a biomass roasting device is needed to solve these problems. Utility Model Content

[0004] This invention proposes a biomass baking device that filters, adsorbs and purifies harmful gases in exhaust gas, deacidifies the exhaust gas, and facilitates the decomposition of organic compounds such as CO and VOCs.

[0005] This utility model is implemented as follows: a biomass baking device includes a base plate and a baking tank. A flat plate is fixedly connected to the outer wall of the baking tank above the base plate, and a high-efficiency exhaust gas treatment mechanism is provided above the base plate.

[0006] The high-efficiency exhaust gas treatment mechanism includes a heat-conducting bend connected to the upper end of the baking tank. A condenser sleeve is installed on the outer wall of the heat-conducting bend. An inlet pipe and an outlet pipe are connected to the lower and upper sides of the outer wall of the condenser sleeve, respectively. A filter box is located to the right of the heat-conducting bend. A horizontal pipe connects the heat-conducting bend and the filter box. A filter plate is installed inside the filter box. An acid gas treatment box is fixedly connected to the upper end of the plate. The acid gas treatment box contains NaOH solution. An air pump is located above the acid gas treatment box. An inlet pipe extending into the acid gas treatment box is connected to the outlet of the air pump. A connecting pipe connects the filter box and the air pump inlet. An adsorption box is fixedly connected to the upper end of the plate. A short pipe connects the acid gas treatment box and the adsorption box. An activated carbon layer is installed inside the adsorption box. A heating pipe is connected to the upper end of the adsorption box. An installation cavity is provided between the inner and outer walls of the heating pipe. An electric heating wire is installed inside the installation cavity. An oxygen pipe connects to the outer wall of the heating pipe.

[0007] In a preferred embodiment of the biomass roasting device of this utility model, a collection box is connected through and fixedly connected to the upper end of the flat plate, the heat-conducting bend is connected to the interior of the collection box, and a drain pipe with a sealing valve is connected to the lower end of the collection box.

[0008] As a preferred embodiment of the biomass baking device of this utility model, a stirring shaft is rotatably connected to the top of the inner wall of the baking tank, the outer wall of the stirring shaft has multiple stirring blades, a heat insulation cover is fixedly connected to the upper end of the baking tank, a drive motor is installed at the upper end of the heat insulation cover, a transmission shaft is fixedly connected between the output end of the drive motor and the stirring shaft, and a protective box located outside the drive motor is fixedly connected to the upper end of the heat insulation cover.

[0009] As a preferred embodiment of the biomass baking device of this utility model, a sandwich layer is provided between the outer wall and the inner wall of the baking tank, and a flexible electric heating jacket is installed inside the sandwich layer.

[0010] In a preferred embodiment of the biomass roasting apparatus of this utility model, the lower end of the acid gas treatment box is connected to an alkali discharge pipe with a sealing valve, and the upper end of the acid gas treatment box is connected to an alkali inlet pipe with a sealing valve.

[0011] As a preferred embodiment of the biomass baking device of this utility model, the bottom end of the baking tank is connected to a discharge pipe with a pneumatic high-temperature butterfly valve, and the outer wall of the baking tank is connected to a feed pipe with a pneumatic high-temperature butterfly valve.

[0012] As a preferred embodiment of the biomass roasting device of this utility model, the upper end of the base plate is fixedly connected to two container placement platforms located directly below the drain pipe and the alkali discharge pipe, respectively.

[0013] The beneficial effects of this utility model are:

[0014] 1. During the roasting process of biomass raw materials, high-temperature exhaust gas is driven by an air pump into a heat-conducting bend. The condenser jacket outside the heat-conducting bend circulates coolant through the inlet and outlet pipes, causing water vapor and high-boiling-point organic matter in the exhaust gas to condense into liquid and be collected. After cooling, the exhaust gas enters the filter box through a horizontal pipe to complete gas-solid separation. Then, it is pressurized by an air pump and injected into the acid gas treatment box. The acid gas is neutralized by NaOH solution, thereby achieving the effect of deacidification treatment of the exhaust gas.

[0015] 2. After the deacidified tail gas enters the adsorption box and the residual pollutants are removed by the activated carbon layer, it is heated to the catalytic reaction temperature by the heating wire through the heating tube. At the same time, oxygen is injected through the oxygen pipe, which promotes the oxidation of CO in the tail gas into CO and the decomposition of VOCs into CO and H2O. This facilitates the decomposition of organic matter such as CO and VOCs, and achieves the complete harmless treatment of organic matter. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is a front sectional view of the biomass roasting device of this utility model;

[0018] Figure 2 For the present utility model Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 This is a partial structural diagram of the present invention;

[0020] Figure 4 This is a partial structural diagram of the present invention.

[0021] The markings in the diagram are: 1. Base plate; 2. Flat plate; 3. Baking tank; 4. Heat-conducting bend; 5. Condensing jacket; 6. Inlet pipe; 7. Outlet pipe; 8. Collection box; 9. Drain pipe; 10. Filter box; 11. Filter plate; 12. Horizontal pipe; 13. Connecting pipe; 14. Acid gas treatment box; 15. Inlet pipe; 16. Air pump; 17. Alkali discharge pipe; 18. Short pipe; 19. Adsorption box; 20. Activated carbon layer; 21. Heating tube; 22. Mounting cavity; 23. Heating wire; 24. Oxygen pipe; 25. Protective box; 26. Discharge pipe; 27. Inlet pipe; 28. Stirring shaft; 29. ​​Heat insulation cover; 30. Drive motor. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0023] Please see Figure 1-4 A biomass baking device includes a base plate 1 and a baking tank 3. A flat plate 2 is fixedly connected to the outer wall of the baking tank 3 above the base plate 1, and a high-efficiency exhaust gas treatment mechanism is provided above the base plate 1.

[0024] The high-efficiency exhaust gas treatment mechanism includes a heat-conducting bend 4 connected to the upper end of the baking tank 3. A condenser sleeve 5 is installed on the outer wall of the heat-conducting bend 4. An inlet pipe 6 and an outlet pipe 7 are connected to the lower and upper sides of the outer wall of the condenser sleeve 5, respectively. A filter box 10 is installed to the right of the heat-conducting bend 4. A horizontal pipe 12 connects the heat-conducting bend 4 and the filter box 10. A filter plate 11 is installed inside the filter box 10. An acid gas treatment box 14 is fixedly connected to the upper end of the plate 2. The acid gas treatment box 14 contains NaOH solution. A gas pump 16 is installed above the acid gas treatment box 14. The outlet of pump 16 is connected to an inlet pipe 15 extending into the acid gas treatment box 14. A connecting pipe 13 connects the filter box 10 and the inlet of pump 16. An adsorption box 19 is fixedly connected to the upper end of plate 2. A short pipe 18 connects the acid gas treatment box 14 and the adsorption box 19. An activated carbon layer 20 is provided inside the adsorption box 19. A heating pipe 21 is connected to the upper end of the adsorption box 19. An installation cavity 22 is provided between the inner and outer walls of the heating pipe 21. An electric heating wire 23 is provided inside the installation cavity 22. An oxygen supply pipe 24 is connected to the outer wall of the heating pipe 21.

[0025] In this embodiment: During the roasting process of biomass raw materials, the air pump 16 is turned on, and the air pump 16 provides power for the flow of exhaust gas. The high-temperature exhaust gas generated during the roasting process is drawn into the heat-conducting bend 4 by the air pump 16. The condenser sleeve 5 outside the heat-conducting bend 4 is injected with coolant through the liquid inlet pipe 6. After absorbing the heat of the exhaust gas, the coolant is discharged from the liquid outlet pipe 7. The water vapor and high-boiling-point organic matter (such as tar) in the exhaust gas are condensed into liquid in the heat-conducting bend 4 and flow into the collection box 8 by gravity.

[0026] After cooling, the exhaust gas enters the filter box 10 through the horizontal pipe 12. The filter plate 11 intercepts the solid dust particles in the gas, achieving gas-solid separation. The filtered exhaust gas enters the air pump 16 through the connecting pipe 13. The air pump 16 pressurizes the exhaust gas and injects it into the acid gas treatment box 14 through the inlet pipe 15. The NaOH solution neutralizes the acidic gases such as SO and HCl in the exhaust gas, thereby achieving the effect of deacidification treatment of the exhaust gas.

[0027] After deacidification, the exhaust gas enters the adsorption box 19 through the short pipe 18. The activated carbon layer 20 removes residual VOCs and some odor substances through physical adsorption, further purifying the exhaust gas.

[0028] After adsorption, the exhaust gas enters the heating tube 21. The heating wire 23 in the mounting cavity 22 heats the exhaust gas to the catalytic reaction temperature. At the same time, an appropriate amount of oxygen is injected through the oxygen supply tube 24. Under the conditions of high temperature and oxygen presence, CO is oxidized to CO, and VOCs are decomposed into CO and H2O, thus facilitating the decomposition of organic matter such as CO and VOCs and achieving the complete harmless treatment of organic matter.

[0029] As a technical optimization of this utility model, a collection box 8 is connected through and fixedly connected to the upper end of the plate 2, the heat-conducting bend 4 is connected to the inside of the collection box 8, and the lower end of the collection box 8 is connected to a drain pipe 9 with a sealing valve.

[0030] In this embodiment, the liquid water and tar condensed inside the heat-conducting bend 4 flow into the collection tank 8 due to gravity and are periodically discharged by opening the sealing valve of the drain pipe 9.

[0031] As a technical optimization of this utility model, a stirring shaft 28 is rotatably connected to the top of the inner wall of the baking tank 3. The outer wall of the stirring shaft 28 has multiple stirring blades. A heat insulation cover 29 is fixedly connected to the upper end of the baking tank 3. A drive motor 30 is installed at the upper end of the heat insulation cover 29. A transmission shaft is fixedly connected between the output end of the drive motor 30 and the stirring shaft 28. A protective box 25 located outside the drive motor 30 is fixedly connected to the upper end of the heat insulation cover 29.

[0032] In this embodiment: the drive motor 30 drives the stirring shaft 28 to rotate through the transmission shaft, and the stirring blades tumble the biomass material in the baking tank 3 to ensure that the material is heated evenly. The heat insulation cover 29 and the protective box 25 together isolate the high temperature of the baking tank 3 and protect the drive motor 30 above.

[0033] As a technical optimization of this utility model, a sandwich layer is provided between the outer wall and the inner wall of the baking tank 3, and a flexible electric heating jacket is installed inside the sandwich layer.

[0034] In this embodiment: the flexible electric heating jacket inside the baking tank 3 heats up after being energized, and heats the material inside the tank through heat conduction.

[0035] As a technical optimization of this utility model, the lower end of the acid gas treatment box 14 is connected to an alkaline solution discharge pipe 17 with a sealing valve, and the upper end of the acid gas treatment box 14 is connected to an alkaline solution inlet pipe with a sealing valve.

[0036] In this embodiment: after the NaOH solution in the acid gas treatment box 14 reacts with the acid gas, the resulting salts dissolve in the waste liquid and are discharged through the alkali discharge pipe 17. Fresh NaOH solution is then replenished through the alkali addition pipe.

[0037] As a technical optimization of this utility model, the bottom end of the baking tank 3 is connected to a discharge pipe 26 with a pneumatic high-temperature butterfly valve, and the outer wall of the baking tank 3 is connected to a feed pipe 27 with a pneumatic high-temperature butterfly valve.

[0038] In this embodiment: the pneumatic high-temperature butterfly valves of the feed pipe 27 and the discharge pipe 26 are driven by compressed air. When feeding, the pneumatic high-temperature butterfly valve of the feed pipe 27 is opened to inject biomass raw materials into the baking tank 3. When discharging, the pneumatic high-temperature butterfly valve of the discharge pipe 26 is opened and the material is discharged under gravity. The pneumatic high-temperature butterfly valve has the characteristic of high temperature resistance.

[0039] As a technical optimization of this utility model, the upper end of the base plate 1 is fixedly connected to two container placement platforms located directly below the drain pipe 9 and the alkaline solution discharge pipe 17, respectively.

[0040] In this embodiment: the container placement platform on the base plate 1 is located directly below the drain pipe 9 and the alkali discharge pipe 17, respectively, and is used to place collection containers to receive condensed waste liquid and waste alkali liquid, so as to facilitate centralized transportation and treatment.

[0041] The working principle and usage process of this utility model are as follows: When in use, the biomass raw materials enter the baking tank 3 through the feed pipe 27. The flexible electric heating jacket in the jacket indirectly heats the materials. The drive motor 30 drives the stirring shaft 28 to rotate through the transmission shaft. The stirring blades turn the materials over to ensure uniform heating.

[0042] At the same time, the air pump 16 is turned on, which provides power for the flow of exhaust gas. The high-temperature exhaust gas generated during the baking process is drawn into the heat-conducting bend 4 by the air pump 16. The condenser sleeve 5 outside the heat-conducting bend 4 is injected with coolant through the liquid inlet pipe 6. After absorbing the heat of the exhaust gas, the coolant is discharged from the liquid outlet pipe 7. The water vapor and high-boiling-point organic matter (such as tar) in the exhaust gas are condensed into liquid in the heat-conducting bend 4 and flow into the collection box 8 by gravity. It is discharged periodically through the liquid outlet pipe 9.

[0043] After cooling, the exhaust gas enters the filter box 10 through the horizontal pipe 12. The filter plate 11 intercepts the solid dust particles, achieving gas-solid separation. The filtered exhaust gas enters the air pump 16 through the connecting pipe 13. The air pump 16 pressurizes the exhaust gas and injects it into the acid gas treatment box 14 through the inlet pipe 15. The NaOH solution neutralizes the acidic gases such as SO and HCl in the exhaust gas, thereby achieving the effect of deacidification treatment of the exhaust gas. The waste liquid after the reaction is discharged periodically through the alkaline solution discharge pipe 17, and fresh alkaline solution is replenished through the alkaline solution addition pipe.

[0044] After deacidification, the exhaust gas enters the adsorption box 19 through the short pipe 18. The activated carbon layer 20 removes residual VOCs and some odor substances through physical adsorption, further purifying the exhaust gas.

[0045] After adsorption, the exhaust gas enters the heating tube 21. The heating wire 23 in the mounting cavity 22 heats the exhaust gas to the catalytic reaction temperature. At the same time, an appropriate amount of oxygen is injected through the oxygen pipe 24. Under the conditions of high temperature and oxygen presence, CO is oxidized to CO, and VOCs are decomposed into CO and H2O, which facilitates the decomposition of organic matter such as CO and VOCs and achieves the complete harmless treatment of organic matter.

[0046] After the material is baked, open the high-temperature butterfly valve of the discharge pipe 26 to discharge the material through the discharge pipe 26. The container placement platform on the bottom plate 1 is used to place the container for collecting liquid, which receives the liquid discharged from the drain pipe 9 and the alkali discharge pipe 17 for centralized processing.

[0047] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. 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. Therefore, they should not be construed as limitations on this utility model.

[0048] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A biomass torrefaction apparatus comprising a base plate (1) and a torrefaction tank (3), characterized in that: A flat plate (2) is fixedly connected to the outer wall of the baking tank (3) above the bottom plate (1), and a high-efficiency exhaust gas treatment mechanism is provided above the bottom plate (1). The high-efficiency exhaust gas treatment mechanism includes a heat-conducting bend (4) connected to the upper end of the baking tank (3). A condenser sleeve (5) is provided on the outer wall of the heat-conducting bend (4). An inlet pipe (6) and an outlet pipe (7) are respectively connected to the lower and upper sides of the outer wall of the condenser sleeve (5). A filter box (10) is provided to the right of the heat-conducting bend (4). A horizontal pipe (12) connects the heat-conducting bend (4) and the filter box (10). A filter plate (11) is installed inside the filter box (10). An acid gas treatment box (14) is fixedly connected through the upper end of the plate (2). The acid gas treatment box (14) is filled with NaOH solution. An air pump (16) is provided above the acid gas treatment box (14). The outlet of the pump (16) is connected to an inlet pipe (15) extending into the acid gas treatment box (14). A connecting pipe (13) connects the filter box (10) and the inlet of the pump (16). An adsorption box (19) is fixedly connected to the upper end of the plate (2). A short pipe (18) connects the acid gas treatment box (14) and the adsorption box (19). An activated carbon layer (20) is provided inside the adsorption box (19). A heating pipe (21) is connected to the upper end of the adsorption box (19). An installation cavity (22) is provided between the inner and outer walls of the heating pipe (21). An electric heating wire (23) is provided inside the installation cavity (22). An oxygen pipe (24) is connected to the outer wall of the heating pipe (21).

2. The biomass torrefaction apparatus of claim 1, wherein: The upper end of the plate (2) is connected to a collection box (8), the heat-conducting bend (4) is connected to the inside of the collection box (8), and the lower end of the collection box (8) is connected to a drain pipe (9) with a sealing valve.

3. The biomass torrefaction apparatus of claim 1, wherein: A stirring shaft (28) is rotatably connected to the top of the inner wall of the baking jar (3). The outer wall of the stirring shaft (28) has multiple stirring blades. A heat insulation cover (29) is fixedly connected to the upper end of the baking jar (3). A drive motor (30) is installed on the upper end of the heat insulation cover (29). A transmission shaft is fixedly connected between the output end of the drive motor (30) and the stirring shaft (28). A protective box (25) located outside the drive motor (30) is fixedly connected to the upper end of the heat insulation cover (29).

4. The biomass torrefaction apparatus of claim 1, wherein: The baking jar (3) has an interlayer between its outer wall and inner wall, and a flexible electric heating jacket is installed inside the interlayer.

5. The biomass torrefaction apparatus of claim 2, wherein: The lower end of the acid gas treatment box (14) is connected to an alkaline solution discharge pipe (17) with a sealing valve, and the upper end of the acid gas treatment box (14) is connected to an alkaline solution inlet pipe with a sealing valve.

6. The biomass torrefaction apparatus of claim 1, wherein: The bottom of the baking tank (3) is connected to a discharge pipe (26) with a pneumatic high-temperature butterfly valve, and the outer wall of the baking tank (3) is connected to a feed pipe (27) with a pneumatic high-temperature butterfly valve.

7. A biomass torrefaction apparatus according to claim 5, wherein: The upper end of the base plate (1) is fixedly connected to two container placement platforms located directly below the drain pipe (9) and the alkaline solution drain pipe (17), respectively.

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