Rice hull gasification co-production carbon steam system

Abstract

The utility model discloses a rice husk gasification co-production carbon steam system which comprises a feeding system, a gasification furnace device, a carbon discharging, conveying and storing system, a fuel gas combustion system, an air supply system and a flue gas treatment system, a raw material conveying system adopts closed negative pressure air conveying and closed square bin storage, and a hearth of the gasification furnace is of a closed structure. The lower part is a high-temperature oxidation reaction area, the upper part is a pyrolysis and drying area, rice husks and air sucked from the top are subjected to pyrolysis gasification reaction, the gasification furnace device is provided with a carbon-gas secondary separation device, fuel gas and carbon are divided into two different channels, and the gasification co-production carbon-steam system cancels a fuel gas induced draft fan, so that the production efficiency of the system is effectively improved; by optimizing the structure of the system, high-efficiency production of biomass charcoal and steam is realized.

Description

Technical Field

[0001] This utility model relates to the field of clean energy technology, and in particular to a rice husk gasification co-production carbon steam system. Background Technology

[0002] Biomass is a green, environmentally friendly, and renewable resource, an important energy source for humankind, and a crucial part of the global chemical and energy sectors. Compared to other renewable energy sources such as solar, wind, tidal, hydropower, and geothermal energy, biomass energy is less restricted by natural environmental conditions. Furthermore, biomass is the only renewable carbon source, possessing a unique composition that allows it to be used in chemical product production, clean fuel conversion, and the preparation of functional carbon materials. It holds the potential to replace petrochemical products and supplement fossil fuels, thereby increasing energy supply. As a major agricultural country, my country is rich in biomass resources, producing approximately 3.539 billion tons of agricultural biomass, 195 million tons of forestry biomass, and 245 million tons of urban biomass annually, totaling 3.979 billion tons. Of this, approximately 326 million tons, or about 8.2%, are likely to be utilized as biomass.

[0003] Waste biomass refers to natural waste generated or involved in the death, growth, harvesting, and utilization of biomass, as well as waste generated by human and animal activities. It is diverse and inexpensive, typically including agricultural straw and rice husks, sugarcane bagasse, coffee husks, and other agricultural food processing waste; forestry residues and sawdust, and other wood processing waste; aquatic waste such as algae; urban solid waste such as animal manure, sewage sludge, and kitchen waste; and industrial organic waste such as pulp. Waste biomass energy can be converted into high-value-added chemicals or fuels through various thermochemical, biochemical, physicochemical transesterification, and physical briquetting technologies. It can be safely, stably, flexibly, and widely applied in various scales of industry, agriculture, transportation, and daily life, making it irreplaceable by other renewable energy sources. Thermochemical conversion technology, developed based on the characteristics of biomass energy, offers advantages such as full conversion of biomass, recycling of all byproducts, shorter reaction times, higher tolerance for raw materials, wide application of products, and ease of operation, making it valuable for development and application. Biomass pyrolysis combined production technology in the thermochemical conversion route can realize the clean utilization of biomass, and produce high-value products such as high-quality fuel gas, biochar, and bio-oil while efficiently treating waste.

[0004] In existing rice husk gasification co-production carbon gasification systems, the raw material conveying process typically uses a common feeder, which easily leads to dust overflow during operation. When the produced gas and char fall simultaneously from the furnace plate screen into the cone, the dust is drawn away by the gas, easily clogging the pipes. Furthermore, the furnace screen cooling system used in rice husk gasification co-production carbon gasification systems is prone to water leakage. Therefore, we propose a rice husk gasification co-production carbon gasification system and method. Utility Model Content

[0005] The main objective of this invention is to provide a rice husk gasification and co-production system for biochar and steam. The raw material conveying system of this invention employs a closed negative pressure pneumatic conveying system and a closed square silo for storage. The gasifier furnace has a closed structure, with a high-temperature oxidation reaction zone at the bottom and a pyrolysis and drying zone at the top. The rice husks undergo pyrolysis and gasification with the air drawn in from the top. The gasifier is equipped with a two-stage biochar and gas separation device, separating the fuel gas and biochar into two different channels. This co-production system eliminates the need for a fuel gas induced draft fan, effectively improving system production efficiency. By optimizing the system structure, this invention achieves high-efficiency production of biochar and steam, effectively solving the problems in the background technology.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A rice husk gasification and co-production system for biomass gasification includes a feeding system, a gasification furnace, a charcoal output and conveying storage system, a gas combustion system, an air supply system, and a flue gas treatment system. The feeding system includes a feeder, a raw material silo, a transverse scraper conveyor, a longitudinal belt conveyor, and a bucket elevator. The feeder is installed outside the raw material silo for feeding biomass raw materials. The bottom of the raw material silo is equipped with three sets of transverse scraper conveyor bodies and three sets of longitudinal belt conveyor bodies. The belt conveyor is used to feed the biomass raw materials into the bucket elevator.

[0008] The bucket elevator is connected to the gasifier of the gasifier device through a pipeline for feeding. The gasifier is equipped with a two-stage carbon-gas separation device, which separates the gas and carbon into two different channels. The water-cooled screw conveyor of the carbon discharge and conveying storage system is installed at the carbon discharge position of the gasifier to lead out the carbon. The gas conveying equipment of the carbon discharge and conveying storage system is connected between the water-cooled screw conveyor and the carbon bin for the conveying and storage of carbon.

[0009] The steam boiler of the gas combustion system is connected to the exhaust pipe of the gasifier through a cyclone separator, and a high-temperature gas fan of the air supply system is installed between the cyclone separator and the exhaust pipe of the gasifier.

[0010] The exhaust pipe of the steam boiler is connected to the inlet pipe of the bag filter of the flue gas treatment system, and the exhaust pipe of the bag filter is connected to the chimney of the flue gas treatment system through a high-temperature gas fan.

[0011] Furthermore, a belt conveyor is installed at the top of the gasifier to deliver biomass raw materials to the gasifier's front hopper, and a screw conveyor is also installed to push the materials in.

[0012] By adopting the above technical solution, the top furnace body of the gasifier can be well fed by a belt conveyor in conjunction with a screw conveyor.

[0013] Furthermore, the gasifier is equipped with a two-stage carbon-gas separation device, which separates the fuel gas and carbon into two different channels;

[0014] By adopting the above technical solution, the gas and charcoal are separated into two different channels, which avoids the dust being sucked up by the gas and blocked by the gas after the gas and charcoal fall into the cone at the same time from the furnace plate screen holes.

[0015] Furthermore, the gas furnace screen gear of the gasifier is externally mounted, which facilitates the operation of the gas furnace screen gear at room temperature;

[0016] By adopting the above technical solution, the gasification furnace screen gears operate at room temperature, eliminating the need for a screen cooling system and completely resolving concerns about water leakage. The new rice husk gasification furnace can achieve an annual production time of 6,000 hours or more.

[0017] Furthermore, the gasifier body is sealed, and the amount of air inside the gasifier is controlled by an air distribution fan.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] ① Raw material conveying system: The unloading and conveying system adopts closed negative pressure wind conveying and closed square silo storage to optimize the production process, reduce pollutant emissions, and achieve clean production.

[0020] ② The gasifier adopts a fully enclosed design, and the feeding system adopts a closed feeding device. The entire feeding process is dust-free and dust does not overflow. During the gasifier production process, no human intervention is required. A single person can operate three to five gasifiers, burners, and boilers. No personnel intervention is required at the top of the furnace, thus avoiding safety hazards.

[0021] ③ The gas and charcoal are separated into two different channels, which avoids the dust being sucked up by the gas and charcoal and clogging the pipes after they fall into the cone from the furnace plate screen at the same time.

[0022] ④ The gas-fired induced draft fan was eliminated, which solved the problem of having to shut down the furnace for cleaning after vibration caused by dust and tar adhering to the fan impeller.

[0023] ⑤ The gas furnace screen gear is externally mounted and operates at room temperature, eliminating the need for a furnace screen cooling system and completely resolving concerns about water leakage. The new rice husk gasification co-production carbon steam system can achieve a continuous production time of 6,000 hours or more.

[0024] ⑥ The gasifier is sealed, and the amount of air inside the gasifier is controlled by the air distribution fan, which controls the air ratio inside the furnace and effectively avoids the occurrence of explosion.

[0025] ⑦ The engineering boiler adopts a double-drum longitudinal arrangement waste heat boiler. The waste heat boiler technology is mature and reliable, with a short construction period and high heat exchange efficiency.

[0026] ⑧ This system is a biomass gasification system with extremely low sulfur content. The flue gas treatment adopts SNCR denitrification + bag filter dust collection system, which is lower than the limit value of the national ultra-low emission standard for NOx. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a rice husk gasification and co-production carbon steam system according to this utility model.

[0028] In the diagram: 1. Bucket elevator; 2. Gasifier; 3. Water-cooled screw conveyor; 4. Cyclone separator; 5. Steam boiler; 6. High-temperature gas blower; 7. Baghouse dust collector; 8. Chimney. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0030] Example 1

[0031] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0032] like Figure 1 As shown, a rice husk gasification co-production system includes a feeding system, a gasification furnace, a charcoal output and conveying storage system, a gas combustion system, an air supply system, and a flue gas treatment system. The feeding system includes a feeder, a raw material silo, a transverse scraper conveyor, a longitudinal belt conveyor, and a bucket elevator 1. The feeder is installed outside the raw material silo for feeding biomass raw materials. The bottom of the raw material silo is equipped with three sets of transverse scraper conveyor bodies and three sets of longitudinal belt conveyor bodies. The belt conveyor is used to feed the biomass raw materials into the bucket elevator 1.

[0033] The bucket elevator 1 is connected to the gasifier 2 of the gasifier device through a pipeline for feeding. The gasifier is equipped with a two-stage carbon-gas separation device, which separates the gas and carbon into two different channels. The water-cooled screw conveyor 3 of the carbon discharge and conveying storage system is installed at the carbon discharge position of the gasifier 2 to lead out the carbon. The gas conveying equipment of the carbon discharge and conveying storage system is connected between the water-cooled screw conveyor 3 and the carbon bin for the conveying and storage of carbon.

[0034] The steam boiler 5 of the gas combustion system is connected to the exhaust pipe of the gasifier 2 through the cyclone separator 4, and a high-temperature gas fan 6 of the air supply system is installed between the cyclone separator 4 and the exhaust pipe of the gasifier 2.

[0035] The exhaust pipe of the steam boiler 5 is connected to the inlet pipe of the bag filter 7 of the flue gas treatment system, and the exhaust pipe of the bag filter 7 is connected to the chimney 8 of the flue gas treatment system through the high-temperature gas fan 6.

[0036] The gasifier 2 is equipped with a belt conveyor at the top of the furnace body to deliver biomass raw materials to the furnace front hopper of the gasifier 2, and a screw conveyor is also provided to push the materials in.

[0037] The gasifier 2 is equipped with a two-stage carbon-gas separation device, which separates the fuel gas and carbon into two different channels.

[0038] The gas furnace screen gear of the gasifier 2 is externally mounted, which makes it convenient for the gas furnace screen gear to work at room temperature.

[0039] The gasifier 2 has a sealed furnace body, and the amount of air inside the gasifier is controlled by an air distribution fan.

[0040] It should be noted that this utility model is a rice husk gasification co-production carbon steam system. ① Raw material conveying system: The unloading and conveying system adopts closed negative pressure wind conveying and closed square silo storage, which optimizes the production process, reduces pollutant emissions, and achieves clean production.

[0041] ② The gasifier adopts a fully enclosed design, and the feeding system adopts a closed feeding device. The entire feeding process is dust-free and dust does not overflow. During the gasifier production process, no human intervention is required. A single person can operate three to five gasifiers, burners, and boilers. No personnel intervention is required at the top of the furnace, thus avoiding safety hazards.

[0042] ③ The gas and charcoal are separated into two different channels, which avoids the dust being sucked up by the gas and charcoal and clogging the pipes after they fall into the cone from the furnace plate screen at the same time.

[0043] ④ The gas-fired induced draft fan was eliminated, which solved the problem of having to shut down the furnace for cleaning after vibration caused by dust and tar adhering to the fan impeller.

[0044] ⑤ The gas furnace screen gear is externally mounted and operates at room temperature, eliminating the need for a furnace screen cooling system and completely resolving concerns about water leakage. The new rice husk gasification co-production carbon steam system can achieve a continuous production time of 6,000 hours or more.

[0045] ⑥ The gasifier is sealed, and the amount of air inside the gasifier is controlled by the air distribution fan, which controls the air ratio inside the furnace and effectively avoids the occurrence of explosion.

[0046] ⑦ The engineering boiler adopts a double-drum longitudinal arrangement waste heat boiler. The waste heat boiler technology is mature and reliable, with a short construction period and high heat exchange efficiency.

[0047] ⑧ This system is a biomass gasification system with extremely low sulfur content. The flue gas treatment adopts SNCR denitrification + bag filter dust collection system, which is lower than the limit value of the national ultra-low emission standard for NOx.

[0048] It should be noted that this utility model is a rice husk gasification and co-production carbon gas system. All components in this utility model are known to those skilled in the art, and their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A rice husk gasification co-production of char and syngas system, characterized in that: It comprises a feeding system, a gasification furnace device, a carbon discharge and conveying storage system, a gas combustion system, an air supply system and a flue gas treatment system, wherein the feeding system comprises a suction machine, a raw material bin, a horizontal scraper, a longitudinal belt conveyor and a bucket elevator (1), the suction machine is installed outside the raw material bin for suction feeding of the biomass raw material, and the bottom of the raw material bin is provided with three groups of machine bodies of the horizontal scraper and three groups of machine bodies of the longitudinal belt conveyor, and the belt conveyor is used for feeding the biomass raw material into the bucket elevator (1); The bucket elevator (1) is communicated with the gasification furnace (2) of the gasification furnace device through a pipeline for feeding, and the gasification furnace is provided with a carbon-gas secondary separation device, the gas and the carbon are separated into two different channels, the water-cooled screw conveyor (3) of the carbon discharge and conveying storage system is installed at the carbon discharge position of the gasification furnace (2) to discharge the carbon, and the gas conveying equipment of the carbon discharge and conveying storage system is connected between the water-cooled screw conveyor (3) and the carbon bin for conveying and storing the carbon; The steam boiler (5) of the gas combustion system is communicated with the exhaust pipe of the gasification furnace (2) through the cyclone separator (4), and the high-temperature gas fan (6) of the air supply system is installed between the cyclone separator (4) and the exhaust pipe of the gasification furnace (2); The exhaust gas pipe of the steam boiler (5) is communicated with the inlet pipe of the bag-type dust collector (7) of the flue gas treatment system, and the exhaust pipe of the bag-type dust collector (6) is communicated with the chimney (8) of the flue gas treatment system through the high-temperature gas fan (6).

2. The rice husk gasification co-production of char and syngas system according to claim 1, characterized in that: The belt conveyor is arranged at the top of the gasification furnace (2) for feeding the biomass raw material to the front bin of the gasification furnace (2), and the screw conveyor is arranged to push the material.

3. The rice husk gasification co-production of char and syngas system according to claim 2, characterized in that: The gasification furnace (2) is provided with a carbon-gas secondary separation device, which separates the gas and the carbon into two different channels.

4. The rice husk gasification co-production of char and syngas system according to claim 3, characterized in that: The gas furnace screen gear of the gasification furnace (2) is of an external type, which facilitates the operation of the gas furnace screen gear at room temperature.

5. The rice husk gasification co-production of char and syngas system according to claim 1, characterized in that: The furnace body of the gasification furnace (2) is in a sealed state, and the air quantity in the gasification furnace is controlled by the air distribution fan.

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