Biomass shallow pyrolysis system utilizing industrial waste heat
By using industrial waste heat to perform shallow pyrolysis of biomass, the problems of high pyrolysis temperature and high production costs of biomass pyrolysis technology are solved, and the efficient and clean energy application of biomass charcoal is realized, reducing energy consumption and pyrolysis costs are reduced. .
Patent Information
- Application Number
- CN202420393902.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-29
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-02-28
AI Technical Summary
The existing biomass pyrolysis technology has problems with high pyrolysis temperature requirements and high production costs in industrial applications, resulting in limited application of biomass as a replacement fuel.
The shallow pyrolysis of biomass is carried out by industrial waste heat, and the waste gas is transported to the drying reserve bin through the waste heat fan for biomass drying. The pyrolysis temperature is controlled at 260-300 degrees in a continuous pyrolysis furnace, and the pyrolysis gas is treated with pyrolysis gas. and combustion modules are used for gas treatment and recycling to reduce energy consumption.
Effectively using industrial waste heat for biomass drying and pyrolysis, reducing energy consumption, increasing the calorific value of biomass carbon, making it an industrial application of efficient and clean energy, and reducing the cost of pyrolysis.
Smart Images
Figure CN222205127U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of biomass pyrolysis, and relates to a biomass shallow-layer pyrolysis system utilizing industrial waste heat. Background Art
[0002] Biomass energy has broad application prospects and huge potential, but biomass is restricted from being used as a fuel in industrial production due to its high moisture content, low calorific value, low density, high alkali metal content, and slow combustion rate. The conversion of biomass into biochar through thermal cracking completely solves the problems of high moisture content, low calorific value, and high harmful alkali metal components in biomass fuel. The performance of biomass as a fuel is greatly improved. Biochar can effectively reduce the ignition temperature and burnout temperature of the mixed fuel, and improve related indicators such as fuel conversion rate and combustion characteristics. Biomass can become a high-quality alternative fuel.
[0003] Although the current biomass pyrolysis technology can greatly improve its combustion performance, it has high requirements for pyrolysis temperature. At the same time, drying the biomass moisture also consumes a lot of heat, and the production cost is high. As an industrial alternative fuel, it is still restricted. The shallow pyrolysis technology of biomass uses industrial waste heat to dry biomass, and controls the pyrolysis temperature at 260-300 degrees to perform shallow pyrolysis of biomass (low-temperature pyrolysis temperature is 300-700 degrees). The calorific value of the product after pyrolysis is 5000-5500 kcal, which matches the calorific value of coal used in power plants, cement plants, etc., and can effectively promote the industrial application of biomass pyrolysis as an efficient and clean energy. Utility Model Content
[0004] The utility model aims to provide a biomass shallow pyrolysis system utilizing industrial waste heat, so as to solve the technical problem in the prior art that there is a lack of a biomass shallow pyrolysis system that can effectively utilize industrial waste heat and fully save energy consumption.
[0005] The shallow pyrolysis system of biomass utilizing industrial waste heat comprises a raw material processing module, a raw material input module, a continuous pyrolysis furnace, a pyrolysis gas processing module, a combustion module and a charcoal storage module. The raw material processing module comprises a waste heat blower, a drying and storage bin, a spiral discharging device and a conveyor belt. The waste heat blower conveys waste heat exhaust gas to the drying and storage bin through a pipeline. A spiral discharging device is provided at the bottom of the drying and storage bin and outputs the dried biomass raw materials to the conveyor belt. The discharging end of the conveyor belt is arranged at the feeding port of the raw material input module, the discharging end of the raw material input module is arranged at the feeding port of the continuous pyrolysis furnace, the discharging port of the continuous pyrolysis furnace is arranged at the feeding port of the charcoal storage module, the combustion module inputs fuel for combustion and is connected to the heat source air inlet of the continuous pyrolysis furnace through a pipeline, the discharging end of the continuous pyrolysis furnace is provided with a pyrolysis gas outlet connected to the pyrolysis gas processing module, the pyrolysis gas processing module stores the processed pyrolysis gas through a gas cabinet, and the gas cabinet supplies pyrolysis gas to the combustion module through a pipeline.
[0006] Preferably, an exhaust hole is provided on the top of the drying storage bin, and the exhaust hole is connected to the exhaust fan through a pipeline to exhaust outwards. A waste heat air inlet is provided on the bottom side of the drying storage bin and connected to the waste heat fan through a pipeline. There are multiple waste heat air inlets and they are evenly arranged along the bottom side of the drying storage bin.
[0007] Preferably, the pyrolysis gas processing module includes a separation cooler, an infusion pump, a combustible gas purification tower, a water seal tank and the gas holder, the pyrolysis gas outlet is connected to the separation cooler, the separation cooler is used to condense high-boiling point liquid substances in the pyrolysis gas and separate them from the pyrolysis gas, the liquid outlet of the separation cooler is connected to the infusion pump to output liquid substances to the outside, and the gas outlet of the separation cooler is connected to the combustible gas purification tower, the water seal tank and the gas holder in sequence through pipelines.
[0008] Preferably, the combustion module includes a combustion chamber and a blower, the blower is connected to the combustion chamber through a pipeline, the combustion chamber is also provided with a fuel nozzle for inputting fuel and a high-temperature air outlet, and the high-temperature air outlet provides high-temperature heat source gas to the continuous pyrolysis furnace.
[0009] Preferably, the combustion module also includes an air mixing system, the high-temperature air outlet is connected to the air inlet 1 of the air mixing system, the air outlet of the continuous pyrolysis furnace for outputting the heat source gas is connected to the air inlet 2 of the air mixing system, and the air outlet of the air mixing system is connected to the air inlet of the continuous pyrolysis furnace for inputting the heat source gas through a high-temperature fan.
[0010] The utility model has the following advantages: the utility model uses waste gas containing industrial waste heat as a drying heat source, inputs it into a drying storage bin to dry the biomass raw materials therein, effectively utilizes these waste heat waste gases with lower temperatures, achieves better drying effects, and saves energy consumption.
[0011] The combustion chamber can control the temperature of the heat source gas by supplying air and controlling the amount of fuel input, thereby meeting the requirements of the continuous pyrolysis furnace for shallow pyrolysis of biomass raw materials. This solution can further reduce energy consumption by replacing external fuels with pyrolysis gas after treatment, and can recycle the heat source gas after use to achieve temperature control. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 The utility model is a schematic diagram of the structure of a biomass shallow pyrolysis system utilizing industrial waste heat.
[0013] The marks in the attached figure are: 1. crusher, 2. feed belt, 3. drying storage bin, 4. conveyor belt, 5. storage bin, 6. variable frequency metering feeder, 7. continuous pyrolysis furnace, 8. slag cooler, 9. carbon storage bin, 10. separation cooler, 11. infusion pump, 12. combustible gas purification tower, 13. water seal tank, 14. gas cabinet, 15. combustion chamber, 16. mixed air system, 17. bag dust collector, 18. chimney, 19. waste heat fan, 20. exhaust fan, 21. high temperature fan, 22. supply fan, 23. induced draft fan. DETAILED DESCRIPTION
[0014] The specific implementation methods of the utility model are further explained in detail below with reference to the accompanying drawings through the description of embodiments, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the utility model concept and technical solution of the utility model.
[0015] like Figure 1As shown, the utility model provides a biomass shallow pyrolysis system utilizing industrial waste heat, including a raw material processing module, a raw material input module, a continuous pyrolysis furnace 7, a pyrolysis gas processing module, a combustion module and a charcoal storage module, wherein the raw material processing module includes a waste heat blower 19, a drying storage bin 3, a spiral discharging device and a conveying belt 4, wherein the waste heat blower 19 conveys waste heat exhaust gas to the drying storage bin 3 through a pipeline, a spiral discharging device is provided at the bottom of the drying storage bin 3 and outputs the dried biomass raw material to the conveying belt 4, and the outlet of the conveying belt 4 The material end is arranged at the feed port of the raw material input module, the discharge end of the raw material input module is arranged at the feed port of the continuous pyrolysis furnace 7, the discharge port of the continuous pyrolysis furnace 7 is arranged at the feed port of the charcoal storage module, the combustion module inputs fuel for combustion and is connected to the heat source air inlet of the continuous pyrolysis furnace 7 through a pipeline, the discharge end of the continuous pyrolysis furnace 7 is provided with a pyrolysis gas outlet connected to the pyrolysis gas treatment module, the pyrolysis gas treatment module stores the treated pyrolysis gas through a gas cabinet 14, and the gas cabinet 14 supplies pyrolysis gas to the combustion module through a pipeline. The waste heat exhaust gas is waste gas with waste heat provided by production lines such as cement plants, power plants, and steel plants. This solution uses this type of waste gas as a drying heat source and inputs it into the drying storage bin 3 to dry the biomass raw materials therein, effectively utilizing these relatively low-temperature waste heat exhaust gases, achieving a better drying effect, and saving energy consumption.
[0016] The drying storage bins 3 are provided in a plurality and arranged along the setting direction of the conveyor belt 4. For example, three drying storage bins 3 are provided in this embodiment. An exhaust hole is provided on the top of each drying storage bin 3, and the exhaust hole is connected to the exhaust fan 20 through a pipeline to exhaust outwards. A waste heat air inlet connected to the waste heat fan 19 through a pipeline is provided on the bottom side of the drying storage bin 3. There are a plurality of waste heat air inlets and they are evenly arranged along the bottom side of the drying storage bin 3. In this way, the waste heat exhaust gas is evenly input from the peripheral side of the bottom of the drying storage bin 3, so that the internal biomass raw materials can be dried more evenly by the waste heat exhaust gas, avoiding partial areas from being not completely dried.
[0017] The raw material processing module also includes a crusher 1 and a feed belt 2, the discharge port of the crusher 1 is located above the feed part of the feed belt 2, and the discharge port of the feed belt 2 is located above the top opening of the drying storage bin 3. When there are multiple drying storage bins 3, the discharge ports of the feed belt 2 are provided in multiple and correspond to the drying storage bins 3 one by one, and the discharge part of the feed belt 2 is arranged according to the layout direction of the drying storage bins 3. In this way, the present scheme crushes the large biomass and then transports the crushed biomass raw materials to each drying storage bin 3 respectively.
[0018] The raw material input module includes a storage bin 5 and a variable frequency metering feeder 6. The variable frequency metering feeder 6 is arranged at the discharge port at the bottom of the storage bin 5 and feeds the material to the feed port of the continuous pyrolysis furnace 7 through a feeding belt. The storage bin 5 is used to receive the dried biomass raw materials, and the variable frequency metering feeder 6 can accurately feed the material according to the processing speed of the continuous pyrolysis furnace 7.
[0019] The combustion module includes a combustion chamber 15 and a blower 22. The blower 22 is connected to the combustion chamber 15 through a pipeline to supply air to supplement oxygen. The combustion chamber 15 is also provided with a fuel nozzle for inputting fuel and a high-temperature air outlet. The high-temperature air outlet provides high-temperature heat source gas to the continuous pyrolysis furnace 7. The combustion chamber 15 can control the temperature of the heat source gas by supplying air and controlling the amount of fuel input, thereby meeting the requirements of the continuous pyrolysis furnace 7 for shallow pyrolysis of biomass raw materials.
[0020] The pyrolysis gas processing module includes a separation cooler 10, an infusion pump 11, a combustible gas purification tower 12, a water seal tank 13 and the gas cabinet 14. The pyrolysis gas outlet is connected to the separation cooler 10. The separation cooler 10 is used to condense high-boiling point liquid substances in the pyrolysis gas and separate them from the pyrolysis gas. The liquid outlet of the separation cooler 10 is connected to the infusion pump 11 to output liquid substances to the outside. The gas outlet of the separation cooler 10 is connected to the combustible gas purification tower 12, the water seal tank 13 and the gas cabinet 14 in sequence through pipelines.
[0021] The combustion module also includes an air mixing system 16, the high-temperature air outlet is connected to the air inlet 1 of the air mixing system 16, the air outlet of the continuous pyrolysis furnace 7 for outputting the heat source gas is connected to the air inlet 2 of the air mixing system 16, and the air outlet of the air mixing system 16 is connected to the air inlet of the continuous pyrolysis furnace 7 for inputting the heat source gas through a high-temperature fan 21. There are multiple air inlets for inputting the heat source gas and they are evenly arranged along the conveying direction of the continuous pyrolysis furnace 7, and the air inlets for inputting the heat source gas are all connected in parallel to the outlet of the high-temperature fan 21. In this way, the utilized heat source gas and the heat source gas with a higher temperature output by the combustion chamber 15 can be mixed to form a heat source gas with a suitable temperature for pyrolysis, and the continuous pyrolysis furnace 7 inputs the mixed heat source gas through multiple air inlets to achieve uniform heating of each section, thereby improving the heating efficiency and heating uniformity.
[0022] The bag filter 17 and the high temperature fan 21 are connected in parallel to the high temperature air outlet. The outlet of the bag filter 17 is connected to the chimney 18 through the induced draft fan 23 to discharge the excess heat source gas. The bag filter 17 can effectively remove the dust therein. The charcoal storage module includes a slag cooler 8, a conveying device and a charcoal storage bin 9. The slag cooler 8 is arranged at the discharge port of the continuous pyrolysis furnace 7. The outlet of the slag cooler 8 is connected to the inlet of the charcoal storage bin 9 through a conveying device.
[0023] The system includes crushing process, drying and storage process, shallow pyrolysis process and cooling and conveying process during production. The details are as follows.
[0024] 1. Biomass raw materials are transported into the factory by car, crushed by crusher 1, and sent to drying storage bin 3 by conveyor belt 4. Drying storage bin 3 is set with specific quantity and size according to production scale, and crushing by crusher 1 must meet size requirements.
[0025] Second, the delivery of preheated waste gas is controlled by the waste heat fan 19, the air duct and the double-channel control valve, and the preheated waste gas is introduced into the air inlet on the bottom side of the drying storage bin 3, and the hot air is discharged from the top of the drying storage bin 3. When the drying target is reached, the door valve is closed to stop the hot air from blowing in. This step can be dried at the same time, or the drying of the biomass raw materials in one drying storage bin 3 can be completed first, and then the air inlet valve of another drying storage bin 3 is opened for drying.
[0026] 3. The biomass raw materials are sent out of the drying storage bin 3 by a spiral discharging device, and then sent to the storage bin 5 by a conveyor belt 4 for use.
[0027] Fourth, the biomass raw materials in the storage bin 5 are discharged from the bottom and then input into the continuous pyrolysis furnace 7 for shallow pyrolysis after being weighed. The fuel usage is automatically and accurately controlled to achieve automatic and accurate control of the pyrolysis temperature between 260-300 degrees, meeting the shallow pyrolysis temperature requirements of biomass and realizing shallow pyrolysis of biomass.
[0028] 5. The pyrolysis gas produced by pyrolysis has a low pyrolysis temperature (between 260-300 degrees) and poor quality, so it needs to be condensed, purified, and then input into the gas cabinet 14 for storage and utilization.
[0029] 6. The biomass char produced by pyrolysis is output to the slag cooler 8 for cooling, and then transported by conveying equipment to the charcoal storage bin 9 for storage.
[0030] Biomass shallow pyrolysis technology is to automatically and accurately control the pyrolysis temperature at 260-300 degrees to perform shallow pyrolysis on biomass, effectively reducing the pyrolysis cost. The calorific value of the product after pyrolysis is 5000-5500 kcal, which matches the calorific value of coal used in power plants, cement plants, etc., and can effectively promote the industrial application of biomass pyrolysis as an efficient and clean energy. Therefore, the resulting biomass charcoal can be transported to raw coal yards such as cement plants, power plants, and steel plants for use.
[0031] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the utility model concept and technical solution of the utility model, or the utility model concept and technical solution are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.
Claims
1. A biomass shallow pyrolysis system utilizing industrial waste heat, comprising a raw material processing module, a raw material input module, a continuous pyrolysis furnace (7), a pyrolysis gas processing module, a combustion module and a charcoal storage module, characterized in that: The raw material processing module comprises a waste heat blower (19), a drying storage bin (3), a spiral discharging device and a conveyor belt (4); the waste heat blower (19) conveys waste heat exhaust gas to the drying storage bin (3) through a pipeline; a spiral discharging device is provided at the bottom of the drying storage bin (3) and outputs the dried biomass raw material to the conveyor belt (4); the discharging end of the conveyor belt (4) is arranged at the feeding port of the raw material input module; the discharging end of the raw material input module is arranged at the feeding port of the continuous pyrolysis furnace (7); the discharging port of the continuous pyrolysis furnace (7) is arranged at the feeding port of the charcoal storage module; the combustion module inputs fuel for combustion and is connected to the heat source air inlet of the continuous pyrolysis furnace (7) through a pipeline; the discharging end of the continuous pyrolysis furnace (7) is provided with a pyrolysis gas outlet connected to the pyrolysis gas processing module; the pyrolysis gas processing module stores the processed pyrolysis gas through a gas cabinet (14); and the gas cabinet (14) supplies pyrolysis gas to the combustion module through a pipeline.
2. The biomass shallow pyrolysis system using industrial waste heat according to claim 1, characterized in that: An exhaust hole is provided on the top of the drying storage bin (3), and the exhaust hole is connected to the exhaust fan (20) through a pipeline to exhaust outwards. A waste heat air inlet is provided on the bottom side of the drying storage bin (3) and is connected to the waste heat fan (19) through a pipeline. There are multiple waste heat air inlets and they are evenly arranged along the bottom side of the drying storage bin (3).
3. The biomass shallow pyrolysis system using industrial waste heat according to claim 1, characterized in that: The pyrolysis gas treatment module comprises a separation cooler (10), an infusion pump (11), a combustible gas purification tower (12), a water seal tank (13) and the gas cabinet (14); the pyrolysis gas outlet is connected to the separation cooler (10); the separation cooler (10) is used to condense high-boiling-point liquid substances in the pyrolysis gas and separate them from the pyrolysis gas; the liquid outlet of the separation cooler (10) is connected to the infusion pump (11) to output the liquid substances to the outside; the gas outlet of the separation cooler (10) is connected to the combustible gas purification tower (12), the water seal tank (13) and the gas cabinet (14) in sequence through pipelines.
4. The shallow pyrolysis system of biomass using industrial waste heat according to claim 1, characterized in that: The combustion module comprises a combustion chamber (15) and a blower (22), wherein the blower (22) is connected to the combustion chamber (15) via a pipeline, and the combustion chamber (15) is also provided with a fuel nozzle for inputting fuel and a high-temperature air outlet, wherein the high-temperature air outlet provides high-temperature heat source gas to the continuous pyrolysis furnace (7).
5. A biomass shallow pyrolysis system utilizing industrial waste heat according to claim 4, characterized in that: The combustion module also includes an air mixing system (16), the high-temperature air outlet is connected to an air inlet 1 of the air mixing system (16), the air outlet of the continuous pyrolysis furnace (7) for outputting heat source gas is connected to an air inlet 2 of the air mixing system (16), and the air outlet of the air mixing system (16) is connected to an air inlet of the continuous pyrolysis furnace (7) for inputting heat source gas via a high-temperature fan (21).