一种防乙醇挥发的双螺旋挤出红薯废渣处理装置

By introducing a sealed trap, a condensation recovery unit, and a negative pressure extraction device into a twin-screw extruder, combined with a spiral groove and a rotary sealing valve, the problem of ethanol volatilization in sweet potato waste treatment was solved, achieving efficient ethanol recovery and low leakage rate, improving resource utilization and reducing environmental pollution.

CN224510502UActive Publication Date: 2026-07-17WUHAN INST OF TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
WUHAN INST OF TECH
Filing Date
2025-04-29
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing twin-screw extruders fail to effectively recover volatile organic compounds (VOCs) from ethanol when processing sweet potato waste, leading to resource waste and environmental pollution.

Method used

A double-spiral extrusion sweet potato residue treatment device for preventing ethanol volatilization was designed. By combining a sealed collection hood, a condensation recovery unit and a negative pressure extraction device, ethanol vapor is captured and condensed. Heat exchange is carried out between the spiral coil condenser and circulating water to recover the condensate. The system's sealing performance is improved by combining a spiral groove and a rotary sealing valve.

Benefits of technology

It achieves an ethanol recovery rate of ≥90% and a leakage rate of <0.5%, improving resource utilization and reducing environmental pollution. The retrofit cost is low and it is applicable to existing twin-screw extruders.

✦ Generated by Eureka AI based on patent content.

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Abstract

本实用新型涉及一种防乙醇挥发的双螺旋挤出红薯废渣处理装置，密封捕集罩的进气口与双螺旋挤出机中挤出筒上的排气口密封连接，密封捕集罩的排气口与冷凝回收单元的进气口连通，冷凝回收单元的排气口与负压抽气装置连通。有益效果为：开启双螺旋挤出机、冷凝回收单元以及负压抽气装置，在负压作用下，乙醇蒸汽先进入密封捕集罩内，由密封捕集罩捕集，然后再进入冷凝回收单元，并与循环水进行热交换，回收冷凝液，双螺旋挤出机内的废渣则排出，通过密封捕集罩、冷凝回收单元以及负压抽气装置协同作用以捕集蒸汽，解决乙醇挥发问题，提升资源利用率并降低环境污染，乙醇回收率≥90％，泄漏率＜0.5％，可以适配现有双螺旋挤出机，改造成本低。
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Claims

1. A double-helix extrusion sweet potato waste residue treatment device for preventing ethanol volatilization, characterized in that, include: A sealed trap (1) is provided, the air inlet of which is sealed to the exhaust port on the extrusion cylinder (210) of the twin-screw extruder (2), the exhaust port of the sealed trap (1) is connected to the air inlet of the condensation recovery unit (3), and the exhaust port of the condensation recovery unit (3) is connected to the negative pressure suction device (4).

2. The ethanol-evaporation-preventing double-helix extrusion sweet potato waste treatment device according to claim 1, characterized in that, The twin-helix extruder (2) has a helical groove (221) on its twin-helix screw (220).

3. The ethanol-evaporation-preventing double-helix extrusion sweet potato waste treatment device according to claim 2, characterized in that, The depth of the spiral groove (221) is 3mm to 5mm.

4. The ethanol-evaporation-preventing double-helix extrusion sweet potato waste treatment device according to claim 3, characterized in that, The pitch of the spiral groove (221) is 1.2 to 1.5 times the outer diameter of the double spiral screw (220).

5. The ethanol-evaporation-preventing double-helix extrusion sweet potato waste treatment device according to claim 1, characterized in that The vacuum degree of the negative pressure pumping device (4) is -0.05MPa to -0.1MPa.

6. The ethanol-evaporation-preventing double-helix extrusion sweet potato waste treatment device according to claim 1, characterized in that The negative pressure extraction device (4) includes a vacuum pump (410) and a pipe (420), wherein the vacuum pump (410) is connected to the exhaust port of the condensation recovery unit (3) via the pipe (420).

7. The ethanol-evaporation-preventing double-helix extrusion sweet potato waste treatment device according to claim 1, characterized in that The condensation recovery unit (3) includes a spiral coil condenser (310) and a liquid storage tank (320). The air inlet of the spiral coil condenser (310) is connected to the exhaust port of the sealing trap (1). The exhaust port of the spiral coil condenser (310) is connected to the negative pressure suction device (4). The liquid outlet of the spiral coil condenser (310) is connected to the liquid inlet of the liquid storage tank (320). The medium inlet and outlet of the spiral coil condenser (310) are respectively connected to a circulating water system with a water temperature of 5℃~10℃ and a flow rate of 10L / min~15L / min.

8. The double-helix extrusion sweet potato residue treatment device for preventing ethanol volatilization according to claim 7, characterized in that, The diameter of the spiral coil condenser (310) is 8mm to 12mm, the number of coil layers is at least 3, and the layer spacing is 15mm to 25mm.

9. The ethanol-evaporation-preventing double-helix extrusion sweet potato waste treatment device according to claim 1, characterized in that A rotary sealing valve (230) is provided on the waste outlet of the extrusion cylinder (210) in the twin-screw extruder (2).

10. The ethanol-evaporation-preventing double-helix extrusion sweet potato waste treatment device according to claim 1, characterized in that, The air inlet of the sealing trap (1) is connected to the exhaust port on the extrusion cylinder (210) of the twin-screw extruder (2) by a flange. A silicone sealing gasket (5) is provided between the flange on the air inlet of the sealing trap (1) and the flange on the exhaust port of the extrusion cylinder (210) of the twin-screw extruder (2). The silicone sealing gasket (5) has a thickness of 5 mm to 8 mm and a compression rate of 15% to 20%.