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Efficient heat energy utilization method used during fast thermal cracking of straw

A pyrolysis and straw technology, applied in the field of straw pyrolysis, can solve the problems of difficult control conditions, low heat energy utilization rate, and great influence on yield, and achieve the goal of improving heat energy utilization rate, high heat energy utilization rate, and reducing production costs Effect

Inactive Publication Date: 2009-12-30
吉林省颐民宝新能源开发有限公司
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Problems solved by technology

The main problem at present is that the conditions of rapid cracking are difficult to control, the conditions are not well controlled, and the utilization rate of heat energy is low, which has a great impact on the yield
In other words, the technology of rapid pyrolysis of biomass is not mature enough

Method used

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  • Efficient heat energy utilization method used during fast thermal cracking of straw

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Embodiment 1

[0018] Example 1. A high-efficiency heat energy utilization method for straw rapid pyrolysis process, such as figure 1 shown. It includes the following steps:

[0019] 1. Drying of crushed straw materials in the trough; 2. Elevating the dried materials to the silo; 3. Transporting the pyrolysis furnace from the silo for thermal cracking; 4. Separating the pyrolysis products from gas to solid through the dust collector of the cracking system; After the gas-solid separation, the gaseous biomass is sent to the rectification scrubber for rectification and washing; 6. The gas discharged from the top of the rectification scrubber is condensed through the top condenser; 7. The charcoal powder after gas-solid separation is sent to the charcoal powder cooler Cooling; 8. Send the cooled carbon powder to the carbon powder dust collector for separation, and the resulting carbon powder is sent to the carbon powder storage tank; 9. The heavy oil discharged from the bottom of the rectifica...

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Abstract

The invention relates to an efficient heat energy utilization method used during fast thermal cracking of straw. The method comprises the following steps: drying; hoisting; thermal cracking; gas-solid separation; rectifying and washing; rectifying, washing and condensation of discharged gas; carbon powder cooling after gas-solid separation; separation of the cooled carbon powder; pumping out cooled heavy oil after rectifying and washing with one part of the heavy oil used for producing straw heavy oil and the other part returned to the step of rectifying and washing; carrying out oil-water separation of condensed oil gas water with the low-boiling point light oil collected for output and the other part returned to the step of rectifying and washing; carrying out heat exchange between fluegas discharged from a cracking furnace and cold air in an air preheater and feeding the cold air in the cracking furnace after heating; and cooling down the flue gas discharged from the air preheaterto a temperature below 150 DEG C and then feeding the flue gas in the drying step (1), the hoisting step (2), and the like. The efficient heat energy utilization method can efficiently and comprehensively increase heat energy utilization rate during thermal cracking to reduce production cost and increase the yield and quality of carbon, condensable gas and combustible gas or biomass fuel; therefore, the method can be widely applied to straw fast thermal cracking production.

Description

technical field [0001] The invention belongs to the technical field of straw pyrolysis, and more specifically relates to the design and innovation of a high-efficiency heat energy utilization method in the rapid pyrolysis process of straw. Background technique [0002] Biomass pyrolysis refers to the thermal degradation of biomass under the condition of complete anoxic or limited oxygen supply, and finally produces char, condensable gas (biofuel) and combustible gas (non-condensable). Biomass pyrolysis is a complex thermochemical reaction process, including reactions such as molecular bond breaking, isomerization, and small molecule polymerization. The three main components of biomass are often assumed to be thermally decomposed independently. Hemicellulose is mainly decomposed at 225-350°C; cellulose is mainly decomposed at 325-375°C; lignin is decomposed at 250-500°C. Hemicellulose and cellulose mainly produce volatile substances, while lignin mainly breaks down into char...

Claims

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Application Information

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IPC IPC(8): C10B53/02C10G1/00
CPCY02E50/14Y02E50/10Y02P20/129
Inventor 丁赤民李建隆
Owner 吉林省颐民宝新能源开发有限公司
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