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Direct blending and melting fertilizer forming device and method for producing biochar-based urea fertilizer

A biochar-based urea-based technology, applied in fertilization devices, fertilizer mixtures, urea compound fertilizers, etc., can solve problems such as low transportation efficiency, low strength of carbon-based slow-release nitrogen fertilizer, and destruction of the internal combination state of urea and biochar.

Pending Publication Date: 2018-03-27
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process of this invention needs to place biochar and nitrogen fertilizer in a closed pressurizable container, such as a high-temperature and high-pressure sterilizer, and the crushed mixture of biochar and nitrogen fertilizer after heating and pressurization needs to be crushed again, and additional crushing equipment is added. It may destroy the internal combination state of urea and biochar; in addition, adding water as a binder in the roller extrusion process may have problems such as low strength and low transportation efficiency of the obtained carbon-based slow-release nitrogen fertilizer

Method used

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  • Direct blending and melting fertilizer forming device and method for producing biochar-based urea fertilizer
  • Direct blending and melting fertilizer forming device and method for producing biochar-based urea fertilizer
  • Direct blending and melting fertilizer forming device and method for producing biochar-based urea fertilizer

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A biochar-based urea fertilizer direct-mixing melting fertilizer device, comprising a screw extruder 10, the screw extruder 10 is connected to a motor 6 and a transmission 7, and the extrusion rate is controlled by the motor 6 and the transmission 7, the screw extruder 10 is covered with a first heating chamber cover 5, the screw extruder 10 is provided with a material inlet and a material outlet, a mixer 4 is provided above the material inlet, and the mixer 4 is covered with a second heating chamber cover 2, A porous discharge mold 12 is provided at the discharge port, a biochar powder feed tank 1 and a urea solid powder feed tank 8 are arranged above the mixer 4 , and a rotary cutter 11 is provided on the outside of the porous discharge mold 12 . A connecting channel 9 is provided between the mixer 4 and the screw extruder 10, and a channel switch is provided at the connecting channel 9. It also includes a control device, which controls the operation of the motor 6 an...

Embodiment 2

[0036] The application of the device of the present invention in the preparation of biochar-based urea fertilizer:

[0037] 1) After biochar and urea are pulverized, pass through the biochar powder feed tank 1 and the urea solid powder feed tank 8 respectively and enter into the mixer 4 to fully stir evenly, wherein the mixer 4 is heated by the second heating chamber cover 2 and the temperature is controlled to 130 °C, the mass ratio of biochar to urea is 0.67:1;

[0038] 2) Turn on the channel switch of the channel 9 connecting the mixer 4 and the screw extruder 10, so that the mixed material enters the screw extruder 10, and the screw extruder 10 is heated by the first heating chamber sleeve 5 and the temperature is controlled at 155°C. To ensure that the urea maintains a stable molten state, the screw extruder 10 controls the extrusion speed through the transmission 7 and the motor 6, so that the biochar and the molten urea fully contact and extrude the porous discharge die...

Embodiment 3

[0041] The application of the device of the present invention in the preparation of biochar-based urea fertilizer:

[0042] 1) After biochar and urea are pulverized, pass through the biochar powder feed tank 1 and the urea solid powder feed tank 8 respectively and enter into the mixer 4 to fully stir evenly, wherein the mixer 4 is heated by the second heating chamber cover 2 and the temperature is controlled to 130 °C, the mass ratio of biochar to urea is 1.5:1;

[0043] 2) Turn on the channel switch of the channel 9 connecting the mixer 4 and the screw extruder 10, so that the mixed material enters the screw extruder 10, and the screw extruder 10 is heated by the first heating chamber sleeve 5 and the temperature is controlled at 155°C. To ensure that the urea maintains a stable molten state, the screw extruder 10 controls the extrusion speed through the transmission 7 and the motor 6, so that the biochar and the molten urea fully contact and extrude the porous discharge die ...

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Abstract

The invention relates to a direct blending and melting fertilizer forming device for producing a biochar-based urea fertilizer. The device comprises a screw extruder, wherein the screw extruder is connected with a motor and a transmission, and the rate of extrusion is controlled by the motor and the transmission; the screw extruder is externally coated with a first heating cavity sleeve, thereby ensuring that the temperature is in a suitable range while blending, and ensuring that the urea is kept in a stable molten state; the screw extruder is provided with a feed port and a discharge port, and a blender is arranged above the feed port; the blender is externally coated with a second heating cavity sleeve, and the discharge port is provided with a porous discharge mold, so that biochar andthe urea in a molten state are fully contacted and extruded by the porous discharge mold; a biochar powder feed chute and a urea solid powder feed chute are arranged above the blender, and a rotary cutter is arranged at the outer side of the porous discharge mold. The invention also relates to a direct blending and melting fertilizer forming method for producing the biochar-based urea fertilizer.The biochar and the urea in a molten state are fully contacted and extruded by the porous discharge mold to produce the biochar-based urea fertilizer with stronger crushing force resistance.

Description

technical field [0001] The invention relates to the field of biomass resource utilization equipment, in particular to a biochar-based urea fertilizer direct-mixing melting fertilizer device and a method thereof. Background technique [0002] In my country's agricultural production and application, urea is one of the most used fertilizers. In order to pursue agricultural output, urea fertilizer is used in large quantities and the loss is serious, which makes the fertilizer nutrients not fully utilized and causes serious economic and environmental problems. Biochar is a solid product after pyrolysis of biomass. After being applied to the soil, it has the effect of soil improvement and soil carbon sequestration. In addition, its rich pore structure and huge specific surface area allow biochar to adsorb NH4+, NO3-, etc. Nutrients, thereby delaying the release time of fertilizer nutrients in the soil and reducing losses. Therefore, the technology of combining biochar and urea fe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00
CPCC05C9/00C05G5/12
Inventor 蒋恩臣钟旋王明峰任永志吕娟许细薇陈志文
Owner SOUTH CHINA AGRI UNIV
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