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SFED-01超临界气凝胶干燥设备

SFE-01超临界气凝胶干燥设备是超临界干燥设备的常用规格之一,SFED-01超临界干燥装置

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一、概述
    超临界干燥技术是近年来发展起来的化工新技术。由于凝胶骨架内部的溶剂存在表面张力,在普通的干燥条件下会造成骨架的坍缩。超临界干燥旨在通过压力和温度的控制,使溶剂在干燥过程中达到其本身的临界点,完成液相至超临界流体转变。过程中溶剂无明显表面张力,在维持骨架结构的前提下完成湿凝胶向气凝胶的转变。
二、主要技术参数
    凝胶干燥器:1L/32MPa,300℃
    分离器:0.6L/20MPa,85℃
    制冷系统:2400kcal/h,风冷,核心进口部件
    储    罐:2L/16MPa
    高压输送泵:5L/40MPa
    变 频 器:1.5kW
三、主要结构组成
    超临界气凝胶干燥装置主要由:气源系统、制冷系统、稳压系统、温度控制系统、压力控制系统、干燥装置、分离装置及电气控制、支架箱体等组成。
四、结构分项说明
4-1、气源系统:
    一般采用CO2为干燥介质,该系统为用户自备,若非国内气瓶供应或非气瓶直接供应,则需提供气源接入口规格尺寸,以便本装置接入系统正常运行。
4-2、制冷系统:
    本系统包括制冷机组、冷箱、冷冻盘管、冷循环泵等组成,为气源液化系统,在超临界干燥临界置换过程中,提供液态气源。
制冷机组:
    制冷形式:风冷,核心部件法国进口,保证装置制冷需要的稳定供应。
    冷箱:不锈钢 304,内部经过特殊工艺处理,确保不泄漏。
    冷冻盘管、冷循环泵:
    采用Cu质弯管与不锈钢 304弯管互换设计,提高制冷面积,增强制冷效果。配备300W冷循环泵,增加冷箱内的制冷换热对流。
4-3、高压输送泵:
    选用高压柱塞CO2泵作为动力输送,确保干燥介质的稳定供应,泵头采用特殊材料,可对试验各阶段流体量的需求适时调节。
    压力范围:常压~20MPa
    流量:16L/h
    变 频 器:1.5kW
4-4、流量计量系统:
    采用气体质量流量计结合流量数显仪表对管路中的CO2气体进行计量,计量精度达到1%F.S.。
    流量控制范围:0~10L/h
4-5、温度控制系统:
    采用PID程序升温控温,在使用过程中,根据升温幅度进行调节,如:0.5℃/min、2℃/min等。设定温度梯度调节数值,系统进行自整定自动控制,整个过程自动完成,无需人工操作。
    温度控制范围:常温~300℃
4-6、压力控制系统:
    精密背压调节阀进行控制。入口压力:≤40MPa
    出口压力:0~20MPa
    适用介质:弱腐蚀性
4-7、干燥装置:
    容积1000ml,内部精密打磨处理,设计压力32MPa,温度:300℃,内部尺寸Φ100×120mm,内部带有测温,外部设计保温隔热装置。
4-8、分离装置:
    分离装置是气液分离的主要场所,大部分液体在此得到有效回收,回收液收集后可再度循环利用,气体则通过上部的出口进入下一环节。
    分离容积:600ml
    分离压力:20MPa
4-9、预热器:
    用于干燥釜的预热,预热温度:≤250℃。
4-10、冷凝器:
    用于压力控制系统前端的冷却,确保压力控制系统正常运行。
4-11、电气控制及箱体支架:
    根据现代实验室要求进行设备的外形设计,美观大方。采用铝塑型材框架,不锈钢成型控制板,人机操作环境,布置得体,与现代实验室搭配和谐。

I. Overview

Supercritical drying technology is a new chemical technology developed in recent years. Because of the surface tension of the solvent in the gel skeleton, the skeleton will collapse under ordinary drying conditions. Supercritical drying aims to make the solvent reach its critical point during the drying process by controlling the pressure and temperature, and complete the transition from liquid phase to supercritical fluid. In the process, the solvent has no obvious surface tension, and the transformation from wet gel to aerogel is completed on the premise of maintaining the skeleton structure.

Second, the main technical parameters

Gel dryer: 1L/32MPa, 300℃

Separator: 0.6L/20MPa, 85℃

Refrigeration system: 2400kcal/h, air-cooled, core imported components.

Tank: 2L/16MPa

High pressure delivery pump: 5L/40MPa

Frequency converter: 1.5kW

Third, the main structure composition

The supercritical aerogel drying device is mainly composed of: air source system, refrigeration system, voltage stabilizing system, temperature control system, pressure control system, drying device, separation device, electrical control, support box and so on.

Iv. Description of structural breakdown

4-1, air supply system:

Generally, CO2 is used as the drying medium, and the system is provided by the user. If it is not supplied by domestic gas cylinders or directly by non-gas cylinders, the specification and size of the gas source access port shall be provided for the normal operation of the device access system.

4-2, refrigeration system:

This system consists of refrigeration unit, cold box, freezing coil, cold circulating pump, etc. It is a gas source liquefaction system, which provides liquid gas source in the critical replacement process of supercritical drying.

Refrigeration unit:

Refrigeration form: air-cooled, and the core components are imported from France to ensure the stable supply of refrigeration needs of the device.

Cold box: stainless steel 304, the inside is treated by special technology to ensure no leakage.

Refrigeration coil and cold circulating pump:

The exchange design of Cu elbow and stainless steel elbow 304 is adopted to increase the refrigeration area and enhance the refrigeration effect. Equipped with 300W cold circulating pump to increase the refrigeration and heat exchange convection in the cold box.

4-3, high pressure pump:

High-pressure plunger CO2 pump is selected as power transmission to ensure the stable supply of drying medium, and the pump head is made of special materials, which can adjust the demand of fluid volume in each stage of the test in time.

Pressure range: normal pressure ~ ~20MPa

Flow: 16L/h

Frequency converter: 1.5kW

4-4, flow metering system:

The CO2 gas in the pipeline is measured by gas mass flowmeter combined with flow digital display instrument, and the measurement accuracy reaches 1% F.S..

Flow control range: 0 ~ 10l/h

4-5, temperature control system:

PID program is used to control the temperature, and the temperature is adjusted according to the temperature increase range, such as 0.5℃/min, 2℃/min, etc. Setting the temperature gradient adjustment value, the system carries out self-tuning automatic control, and the whole process is completed automatically without manual operation.

Temperature control range: normal temperature ~ 300℃

4-6, pressure control system:

Precision back pressure regulating valve for control. Inlet pressure: ≤40MPa

Outlet pressure: 0 ~ 20 MPa

Applicable medium: weakly corrosive

4-7, drying device:

The volume is 1000ml, the internal precision grinding treatment, the design pressure is 32MPa, the temperature is 300℃, the internal size is φ Φ100×120mm, the internal temperature is measured, and the external thermal insulation device is designed.

4-8, separation device:

The separation device is the main place for gas-liquid separation, where most of the liquid is effectively recovered, and the recovered liquid can be recycled again after collection, and the gas enters the next link through the upper outlet.

Separation volume: 600ml

Separation pressure: 20MPa

4-9. Preheater:

Used for preheating drying kettle, preheating temperature: ≤250℃.

4-10, condenser:

Used for cooling the front end of the pressure control system to ensure the normal operation of the pressure control system.

4-11, electrical control and box bracket:

According to the requirements of modern laboratory, the shape design of the equipment is beautiful and generous. Adopt aluminum-plastic profile frame, stainless steel molding control panel, man-machine operation environment, proper layout, and harmonious with modern laboratory.

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