Combustion vertical rice hull carbonization furnace, flue gas waste heat recovery device and carbonization process

Abstract

A feeding area, a preheating area and a combustion area are sequentially arranged in a shell from top to bottom, a feeding pipe is arranged on one side of the upper portion of the feeding area, a plurality of air inlets are formed in the lower portion of the combustion area, and a discharging opening is connected to the bottom of the combustion area; the stirring motor is installed on the top wall of the shell, the output end of the stirring motor is connected with a transmission box, the top end of the stirring shaft is in transmission connection with the stirring motor through the transmission box, the bottom end of the stirring shaft extends into the shell, and a plurality of first stirring rods are arranged in the circumferential direction of the stirring shaft located in the preheating area; a plurality of second stirring rods are circumferentially arranged on the stirring shaft in the combustion area, a flue gas outlet pipe is arranged at the top of the shell, a frequency conversion fan is mounted on the flue gas outlet pipe, a first thermocouple is arranged in the preheating area, and a second thermocouple is arranged in the combustion area. Continuous operation from feeding to finished product production can be achieved, carbonization quality control over products is achieved, and the production efficiency is high.

Description

Technical Field

[0003] The invention relates to the technical field of rice husk carbonization furnaces, and in particular to a combustion vertical rice husk carbonization furnace, a flue gas waste heat recovery device and a carbonization process. Background Art

[0004] Rice husk is the outer layer of rice. Burning it can form carbonized rice husk, which can be used as high-quality thermal insulation material for molten metal in the metallurgical industry. It is environmentally friendly and has good thermal insulation effects. It can also be used for the cultivation of flowers, seedlings and fruit trees. It can also be used as a clean energy for making fire and heating. It is widely used.

[0005] The existing rice husk carbonization furnace puts rice husk into the carbonization chamber through the feed port and then burns it in the carbonization chamber. During the combustion process, the rice husk will produce smoke, which is directly discharged through the feed port and discharged into the air, causing environmental pollution. At the same time, the heat contained in the smoke is directly discharged outdoors, resulting in heat waste. Summary of the invention

[0006] The purpose of the present invention is to provide a vertical rice husk carbonization furnace, a flue gas waste heat recovery device and a carbonization process to solve the above problems existing in the prior art.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A combustion vertical uninterrupted rice husk carbonization furnace of the present invention comprises a shell, a stirring device, a first thermocouple, a second thermocouple and a variable frequency discharger, wherein a feeding zone, a preheating zone and a combustion zone are sequentially arranged in the shell from top to bottom, the preheating zone and the combustion zone are separated by an isolation grate, a feeding pipe is arranged on one side of the upper part of the feeding zone, a plurality of air inlets are arranged at the lower part of the combustion zone, and a discharge port is connected to the bottom, the variable frequency discharger is arranged in the discharge port, the stirring device comprises a stirring motor, a transmission box and a stirring shaft, the stirring motor is installed on the top wall of the shell and the output end is connected to There is a transmission box, the top end of the stirring shaft is connected to the stirring motor through the transmission box, the bottom end extends into the shell and extends downward after passing through the isolation grate, the stirring shaft located in the preheating zone is circumferentially provided with a plurality of first stirring rods, the stirring shaft located in the combustion zone is circumferentially provided with a plurality of second stirring rods, a smoke outlet pipe is provided on the top of the shell, a variable frequency fan is installed on the smoke outlet pipe, the preheating zone is provided with the first thermocouple, the combustion zone is provided with the second thermocouple, and the rice husk is ignited and carbonized in the combustion zone, and negative pressure operation is performed.

[0009] Furthermore, ignition circular tubes are arranged outside the plurality of air inlets along the circumference of the shell.

[0010] Furthermore, the cross-sections of the feeding zone and the preheating zone are both trapezoidal, and the cross-section of the combustion zone is an inverted trapezoid.

[0011] Furthermore, a first bevel gear and a second bevel gear are provided in the transmission box, the output end of the stirring motor extends into the transmission box and is connected to the first bevel gear, the first bevel gear is meshed with the second bevel gear, and the second bevel gear is connected to the top end of the stirring shaft.

[0012] Furthermore, an anti-blocking motor is provided in the feed pipe.

[0013] The present invention also provides a flue gas waste heat recovery device for a vertical combustion uninterrupted rice husk carbonization furnace. The vertical combustion uninterrupted rice husk carbonization furnace adopts the device, which also includes a cyclone cleaner, a condenser, a fan and a flame arrester connected in sequence. The flue gas outlet pipe is connected to the cyclone cleaner, and a high-pressure spiral nozzle is arranged on the cyclone cleaner. The first water seal and the second water seal are respectively arranged at the bottom of the cyclone cleaner and the condenser, and the flame arrester is connected to the combustion chamber.

[0014] The present invention also provides a combustion vertical uninterrupted rice husk carbonization process, which uses the combustion vertical uninterrupted rice husk carbonization furnace, comprising the following steps:

[0015] S1: feeding, feeding the rice husk material into the shell through the feeding pipe, and controlling the material surface to two-thirds of the preheating zone;

[0016] S2: Start the variable frequency fan, flue gas purification device, circulating cooling water pump, dust collector and flue gas ignition ignition device;

[0017] S3: Ignition, igniting the rice husk material in the combustion zone through the air inlet, at which time the first thermocouple and the second thermocouple respectively detect and feedback the temperature of the preheating zone and the combustion zone;

[0018] S4: Adjust the air volume, control the combustion temperature in the combustion zone at 350℃-500℃, the temperature in the preheating zone at less than 100℃, and the negative pressure in the furnace at 0.3kPa-0.6kPa;

[0019] S5: According to the furnace temperature, the discharging speed of the discharging port is adjusted by the variable frequency discharging machine;

[0020] S6: The carbonized rice husks discharged from the discharge port are cooled by water, and the open flame is eliminated, and the rice husks are transported to the packaging workshop;

[0021] S7: Normal production after all parameters are adjusted and stabilized;

[0022] S8: Shutdown operation, stop feeding, reduce air volume, and after clearing the materials in the furnace, turn off the variable frequency fan, flue gas purification device, dust collector and circulating cooling water pump in sequence.

[0023] Compared with the prior art, the beneficial technical effects of the present invention are:

[0024] The combustion vertical uninterrupted rice husk carbonization furnace and carbonization process of the present invention are provided with a shell, a stirring device, a first thermocouple, a second thermocouple and a variable frequency discharger, wherein the shell adopts a vertical structure, and is provided with a loading area, a preheating area, a combustion area and a finished product unloading area from top to bottom in sequence, and an adjustable variable frequency fan is provided on the flue gas outlet pipe to control the air volume, and the air volume and the unloading speed are adjusted in combination with the temperature feedback of the thermocouple, so that continuous and uninterrupted operation from loading to finished products can be achieved, and the carbonization quality of the product can be controlled by controlling the combustion temperature and the unloading speed, with high production efficiency, reasonable overall structural design, convenient use, and suitable for promotion. The carbonized rice husk produced by the present invention is mainly used as a high-quality thermal insulation material for molten metal in the metallurgical industry, and has good environmental protection and thermal insulation effects.

[0025] The flue gas waste heat recovery device of the combustion vertical uninterrupted rice husk carbonization furnace of the present invention can fully recover the flue gas waste heat, improve the utilization rate of the flue gas waste heat, and reduce the waste of flue gas waste heat resources by arranging a cyclone impurity remover, a condenser, a fan and a flame arrester. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a structural schematic diagram of a combustion vertical uninterrupted rice husk carbonization furnace according to Example 1 of the present invention;

[0028] Figure 2 This is a schematic structural diagram of a flue gas waste heat recovery device for a vertical uninterrupted rice husk carbonization furnace according to Example 2 of the present invention.

[0029] Explanation of the accompanying drawings: 1. Shell; 11. Loading area; 12. Preheating area; 13. Combustion area; 14. Isolation grate; 15. Feed pipe; 151. Anti-blocking motor; 16. Air inlet; 161. Ignition round tube; 17. Discharge port; 18. Smoke outlet pipe; 181. Frequency conversion fan; 2. Stirring device; 21. Stirring motor; 22. Transmission box; 23. Stirring shaft; 24. First stirring rod; 25. Second stirring rod; 3. First thermocouple; 4. Second thermocouple; 5. Frequency conversion unloader; 6. Cyclone cleaner; 61. High-pressure spiral nozzle; 62. First water seal; 7. Condenser; 71. Second water seal; 8. Fan; 9. Flame arrester; 10. Combustion chamber. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the terms "length", "width", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The technical solutions provided by various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0034] Example 1

[0035] like Figure 1As shown, the combustion vertical uninterrupted rice husk carbonization furnace of this embodiment 1 includes a shell 1, a stirring device 2, a first thermocouple 3, a second thermocouple 4 and a variable frequency unloader 5, wherein a loading area 11, a preheating area 12 and a combustion area 13 are sequentially arranged in the shell 1 from top to bottom, and the preheating area 12 and the combustion area 13 are separated by an isolation grate 14. The preheating area 12 and the combustion area 13 are separated by an isolation grate 14, which can ensure that the rice husk will not directly contact the high-temperature flame during the preheating stage, thereby avoiding excessive combustion or premature carbonization.

[0036] like Figure 1 As shown, the cross-sections of the feeding zone 11 and the preheating zone 12 are trapezoidal, which is conducive to the uniform distribution and flow of rice husks, and the cross-section of the combustion zone 13 is an inverted trapezoid, which is conducive to the concentration of the flame and the full combustion of the rice husks. At the same time, a feeding pipe 15 is arranged on one side of the upper part of the feeding zone 11 to facilitate the continuous addition of rice husks. A plurality of air inlets 16 are arranged at the lower part of the combustion zone 13, and a discharge port 17 is connected to the bottom. A variable frequency unloader 5 is arranged in the discharge port 17 to realize the continuous discharge of rice husks after carbonization and improve the production efficiency. At this time, an ignition circular tube 161 is arranged outside the plurality of air inlets 16 along the circumference of the shell 1, which can not only ensure that the flame is evenly distributed in the combustion zone and improve the combustion efficiency of the rice husk, but also provide sufficient oxygen to support the full combustion of the rice husk.

[0037] In this embodiment, the stirring device 2 includes a stirring motor 21, a transmission box 22 and a stirring shaft 23. The stirring motor 21 is installed on the top wall of the shell 1 and the output end is connected to the transmission box 22. The top end of the stirring shaft 23 is transmission-connected to the stirring motor 21 through the transmission box 22, and the bottom end extends into the shell 1 and extends downward after passing through the isolation grate 14. The stirring shaft 23 located in the preheating zone 12 is circumferentially provided with a plurality of first stirring rods 24, which can stir the rice husk during the preheating stage to ensure that the rice husk can be evenly heated and the preheating efficiency is improved. The stirring shaft 23 located in the combustion zone 13 is circumferentially provided with a plurality of second stirring rods 25. During the combustion stage, the second stirring rods can ensure that the rice husk is fully mixed in the combustion zone, improve the combustion efficiency, and prevent local overheating or incomplete combustion.

[0038] In addition, a smoke outlet pipe 18 is provided on the top of the shell 1, and a variable frequency fan 181 is installed on the smoke outlet pipe 18. Through variable frequency control, the speed of the fan can be adjusted according to actual needs, so as to achieve precise control of smoke emission. The preheating zone 12 is provided with a first thermocouple 3 for real-time monitoring of the temperature of the preheating zone, and the combustion zone 13 is provided with a second thermocouple 4 for real-time monitoring of the temperature of the combustion zone. The first thermocouple 3 and the second thermocouple 4 can accurately control the temperature of the preheating zone and the combustion zone, which can ensure that the rice husk can obtain the best treatment effect in both the preheating and combustion stages, thereby further improving the carbonization efficiency and quality. The rice husk is ignited and carbonized in the combustion zone 13, and negative pressure operation is performed, wherein the negative pressure operation can ensure that the smoke generated during the combustion process can be smoothly discharged through the smoke outlet pipe, avoiding the accumulation or leakage of smoke inside the equipment. At the same time, the negative pressure operation can also improve the combustion efficiency, so that the rice husk can be more fully burned and carbonized. Preferably, the combustion temperature of the combustion zone 13 is controlled at 350°C-500°C, the temperature of the preheating zone 12 is controlled within 100°C, and the negative pressure in the furnace is controlled at 0.3 kPa-0.6 kPa.

[0039] Optionally, a first bevel gear and a second bevel gear are provided in the transmission box 22 , the output end of the stirring motor 21 extends into the transmission box 22 and is connected to the first bevel gear, the first bevel gear is meshed with the second bevel gear, and the second bevel gear is connected to the top of the stirring shaft 23 .

[0040] In addition, an anti-blocking motor 151 is provided in the feed pipe 15, which can effectively prevent the occurrence of material blockage and improve the feeding efficiency and equipment reliability of the carbonization furnace. Specifically, the anti-blocking motor 151 can provide additional driving force or vibration through its driving mechanism, such as a screw conveyor, a vibrator, etc., when the rice husk material enters the feed pipe 15, thereby effectively preventing the raw material from being blocked in the pipeline.

[0041] When the combustion vertical uninterrupted rice husk carbonization furnace of the present embodiment 1 is in use, the rice husk material is first fed into the shell 1 through the feed pipe 15, and the material surface is controlled at two-thirds of the preheating zone 12, and then the variable frequency fan 181, the flue gas purification device, the circulating cooling water pump, the dust collector and the flue gas ignition and ignition device are started, and the rice husk material in the combustion zone 13 is ignited through the air inlet 16. At this time, the first thermocouple 3 and the second thermocouple 4 respectively detect and feedback the temperatures of the preheating zone 12 and the combustion zone 13, and the combustion temperature of the combustion zone 13 is controlled at 350°C-500°C by adjusting the air volume, and the temperature of the preheating zone 12 is controlled within 100°C, and the negative pressure in the furnace is controlled at 0.3kPa-0.6kPa. The discharge speed of the discharge port 17 is adjusted by the variable frequency discharger 5 according to the furnace temperature, and the carbonized rice husk discharged through the discharge port 17 is cooled by water, and the open flame is eliminated, and then it is transported to the packaging workshop.

[0042] The combustion vertical uninterrupted rice husk carbonization furnace of this embodiment 1 can ensure the uniformity and stability of rice husk during the carbonization process through reasonable zoning and structural design, and can realize continuous feeding, preheating, combustion and carbonization of rice husk, thereby improving production efficiency.

[0043] Example 2

[0044] like Figure 2 As shown, the flue gas waste heat recovery device of the vertical uninterrupted rice husk carbonization furnace of combustion of this embodiment 2 adopts the vertical uninterrupted rice husk carbonization furnace of combustion, and also includes a cyclone impurity collector 6, a condenser 7, a fan 8 and a flame arrester 9 which are connected in sequence. The flue gas outlet pipe 18 is connected to the cyclone impurity collector 6. The cyclone impurity collector 6 is provided with a high-pressure spiral nozzle 61. The bottom of the cyclone impurity collector 6 and the condenser 7 are respectively provided with a first water seal 62 and a second water seal 71. The main function of the first water seal 62 and the second water seal 71 is to prevent particulate matter and moisture in the flue gas from entering the subsequent treatment system, and also helps to collect and process particulate matter separated from the cyclone impurity collector 6 and the condenser 7. The flame arrester 9 is connected to the combustion chamber 10 to ensure that the connection between the flue gas and the combustion chamber 10 can be quickly cut off in an emergency to ensure the safety of the equipment.

[0045] At this time, the flue gas is discharged from the flue gas outlet pipe 18 and first enters the cyclone cleaner 6. In the cyclone cleaner 6, the particulate matter in the flue gas is removed, and is collected and processed by the first water seal 62, and is further cleaned by the high-pressure spiral nozzle 61. The flue gas after the impurities are removed enters the condenser 7, and exchanges heat with the cooling medium inside the condenser 7. The water vapor in the flue gas is condensed into liquid water, and the waste heat in the flue gas is recovered. The fan 8 provides power to transport the condensed flue gas to the flame arrester 9. When the flue gas passes through the flame arrester 9, the sparks or high temperature therein are blocked by the flame arrester element to prevent the occurrence of fire accidents. The flue gas treated by the flame arrester 9 enters the combustion chamber 10 for reuse.

[0046] Example 3

[0047] The combustion vertical uninterrupted rice husk carbonization process of this embodiment 3 adopts a combustion vertical uninterrupted rice husk carbonization furnace, comprising the following steps:

[0048] S1: feeding the rice husk material into the housing 1 through the feeding pipe 15, and controlling the material surface to be at two-thirds of the preheating zone 12;

[0049] S2: Start the variable frequency fan 181, the flue gas purification device, the circulating cooling water pump, the dust collector and the flue gas ignition ignition device;

[0050] S3: Ignition, igniting the rice husk material in the combustion zone 13 through the air inlet 16, at which time the first thermocouple 3 and the second thermocouple 4 respectively detect and feedback the temperatures of the preheating zone 12 and the combustion zone 13;

[0051] S4: Adjust the air volume, control the combustion temperature of the combustion zone 13 to 350°C-500°C, the temperature of the preheating zone 12 to less than 100°C, and the negative pressure in the furnace to 0.3kPa-0.6kPa;

[0052] S5: According to the furnace temperature, the discharge speed of the discharge port 17 is adjusted by the variable frequency discharger 5;

[0053] S6: Cooling the carbonized rice husk discharged from the discharge port 17 with water, eliminating the open flame, and transporting it to the packaging workshop;

[0054] S7: Normal production after all parameters are adjusted and stabilized;

[0055] S8: Shutdown operation, stop feeding, reduce air volume, and after clearing the materials in the furnace, turn off the variable frequency fan 181, flue gas purification device, dust collector and circulating cooling water pump in sequence.

[0056] The combustion vertical uninterrupted rice husk carbonization furnace of the present invention is provided with a shell, a stirring device, a first thermocouple, a second thermocouple and a variable frequency unloader, wherein the shell adopts a vertical structure, and is provided with a loading area, a preheating area, a combustion area and a finished product unloading area from top to bottom. The flue gas outlet pipe is provided with an adjustable variable frequency fan to control the air volume. The air volume and the unloading speed are adjusted in combination with the temperature feedback of the thermocouple, so that continuous and uninterrupted operation from loading to finished product production can be achieved. By controlling the combustion temperature and the unloading speed, the carbonization quality of the product can be controlled. The production efficiency is high, the overall structural design is reasonable, and it is easy to use and suitable for promotion.

[0057] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A vertical uninterrupted combustion rice husk carbonization furnace, characterized in that: The invention comprises a shell, a stirring device, a first thermocouple, a second thermocouple and a variable frequency discharger, wherein a feeding zone, a preheating zone and a combustion zone are sequentially arranged in the shell from top to bottom, the preheating zone and the combustion zone are separated by an isolation grate, a feeding pipe is arranged on one side of the upper part of the feeding zone, a plurality of air inlets are arranged at the lower part of the combustion zone, a discharge port is connected to the bottom, the variable frequency discharger is arranged in the discharge port, the stirring device comprises a stirring motor, a transmission box and a stirring shaft, the stirring motor is installed on the top wall of the shell and the output end is connected to the transmission box, the stirring The top end of the mixing shaft is connected to the mixing motor through the transmission box, and the bottom end extends into the shell and extends downward after passing through the isolation grate. The mixing shaft located in the preheating zone is circumferentially provided with a plurality of first mixing rods, and the mixing shaft located in the combustion zone is circumferentially provided with a plurality of second mixing rods. A flue gas outlet pipe is provided on the top of the shell, and a variable frequency fan is installed on the flue gas outlet pipe. The preheating zone is provided with the first thermocouple, and the combustion zone is provided with the second thermocouple. Rice husks are ignited and carbonized in the combustion zone, and negative pressure operation is performed.

2. The combustion vertical uninterrupted rice husk carbonization furnace according to claim 1 is characterized in that: Ignition round tubes are arranged on the outer sides of the plurality of air inlets in the circumferential direction of the shell.

3. The combustion vertical uninterrupted rice husk carbonization furnace according to claim 1 is characterized in that: The cross sections of the feeding zone and the preheating zone are both trapezoidal, and the cross section of the combustion zone is an inverted trapezoid.

4. The combustion vertical uninterrupted rice husk carbonization furnace according to claim 1 is characterized in that: The transmission box is provided with a first bevel gear and a second bevel gear, the output end of the stirring motor extends into the transmission box and is connected to the first bevel gear, the first bevel gear is meshed and connected with the second bevel gear, and the second bevel gear is connected to the top end of the stirring shaft.

5. The combustion vertical uninterrupted rice husk carbonization furnace according to any one of claims 1 to 4, characterized in that: An anti-blocking motor is arranged in the feeding pipe.

6. A flue gas waste heat recovery device for a vertical uninterrupted rice husk carbonization furnace, characterized in that: The combustion vertical uninterrupted rice husk carbonization furnace according to any one of claims 1 to 5 also includes a cyclone cleaner, a condenser, a fan and a flame arrester connected in sequence, the flue gas outlet pipe is connected to the cyclone cleaner, the cyclone cleaner is provided with a high-pressure spiral nozzle, the cyclone cleaner and the condenser are respectively provided with a first water seal and a second water seal at the bottom, and the flame arrester is connected to the combustion chamber.

7. A vertical uninterrupted combustion rice husk carbonization process, characterized in that: The combustion vertical uninterrupted rice husk carbonization furnace according to any one of claims 1 to 5 comprises the following steps: S1: feeding, feeding the rice husk material into the shell through the feeding pipe, and controlling the material surface to two-thirds of the preheating zone; S2: Start the variable frequency fan, flue gas purification device, circulating cooling water pump, dust collector and flue gas ignition ignition device; S3: Ignition, igniting the rice husk material in the combustion zone through the air inlet, at which time the first thermocouple and the second thermocouple respectively detect and feedback the temperature of the preheating zone and the combustion zone; S4: Adjust the air volume, control the combustion temperature in the combustion zone at 350℃-500℃, the temperature in the preheating zone at less than 100℃, and the negative pressure in the furnace at 0.3kPa-0.6kPa; S5: According to the furnace temperature, the discharging speed of the discharging port is adjusted by the variable frequency discharging machine; S6: The carbonized rice husks discharged from the discharge port are cooled by water, and the open flame is eliminated, and the rice husks are transported to the packaging workshop; S7: Normal production after all parameters are adjusted and stabilized; S8: Shutdown operation, stop feeding, reduce air volume, and after clearing the materials in the furnace, turn off the variable frequency fan, flue gas purification device, dust collector and circulating cooling water pump in sequence.

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