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JGXT-4 Tunnel Drying Experimental Device

5. Material critical water content Xc: 0.8

The main equipment of the tunnel drying experimental device: The tunnel drying experimental device measures the drying rate curve of wet materials under constant drying conditions (that is, the hot air temperature, humidity, and flow rate are constant), and determines the critical moisture content of the dried materials under these conditions. ; Can reflect the structure and operation method of atmospheric tunnel dryer; can enable students to learn about the use of parameter measurement and control instruments in experiments.

Tunnel drying experimental device function:
1. Understand the basic structure and working principle of laboratory drying equipment
2. Master the measuring method of drying curve (X-τ) and drying rate curve (UX) of materials under constant drying conditions
3. Learn how to determine the moisture content of materials. Deepen the understanding of the concept of material critical water content Xc and its influencing factors.
4. Learn how to measure the convective heat transfer coefficient between the material and the air during the constant-speed drying stage.
5.Learn to use the error analysis method to estimate the error of the experimental results

Tunnel drying experimental device parameters:
1. Air flow: 40--100 m3 / h, dry bulb temperature: 70 ℃, normal pressure operation
2. Water content of experimental materials X: 0.2-2.0
3. Drying area S: 0.02-0.03m2
4. Drying rate U: 0.5—2.5 × 10-4 [kg / (s · m2)]

1. Stainless steel tunnel dryer: 0.9m long, cross-sectional area of air circulation 0.17 × 0.21 = 0.0357 m2
2. Orifice flowmeter, LXWY differential pressure sensor 0 ~ 10.00Kpa
3. Weight sensor: 0-200g, accuracy 0.5
4, AI501 Yudian temperature digital display 2
5, AI501 Yudian weight digital display
6. AI501 digital display of voltage difference
7, AI519 Yudian temperature digital control display instrument (with manual function)
8, 3 Pt100 resistance thermometers
9, N2-401-H frequency converter, specification: (0-50) Hz
10. Blower: CZR-L80 three-phase low-noise medium-voltage fan, the motor power is 0.55 kW
11, Zhengtai Electric: contactor, switch, leakage protection air switch
12, stainless steel pipelines, fittings and valves
13, stainless steel instrument cabinet: measurement and control, electrical equipment on the experimental stand
14. Stainless steel frame 1.8 × 0.55 × 1.60 meters

JGXT-2860L tunnel dryer experimental device

Air flow: 40--100 m3 / h, dry bulb temperature: 70 ℃, normal pressure operation

Water content of experimental material X: 0.2-2.0

Drying area S: 0.02-0.03m2

Drying rate U: 0.5 — 2.5 × 10-4 [kg / (s · m2)]

Material critical water content Xc: 0.8;

The pipelines, valves and storage tanks of the experimental device are all made of stainless steel 304, which is beautiful in appearance, easy to operate, and has a safety alarm function.

public facilities:

Water: The device comes with a wet bulb temperature adding water bottle, and 200ml of water is added before the experiment.

Electricity: voltage AC380V, power 3.0KW, standard three-phase five-wire system. Each laboratory needs to be equipped with 1-2 ground points (safety ground and signal ground).

Air: The air comes from the fan and is heated by the heater into the tunnel drying box (with its own air source)

Experimental material: homemade sticky cloth rectangular material, weighing about 20 grams,

Object composition

Stainless steel tunnel dryer: 0.9m long, cross-sectional area of air circulation 0.17 × 0.21 = 0.0357 m2

Heater: stainless steel, heating power 2.5KW,

Orifice flowmeter, LXWY differential pressure sensor 0 ~ 10.00Kpa,

Weight sensor: 0-200g, accuracy 0.5,

AI501 Yudian temperature digital display 2

AI501 Yudian weight digital display instrument,

AI501 Yu voltage difference digital display instrument,

AI519 Yudian temperature digital control display instrument (with manual function),

3 Pt100 resistance thermometers,

N2-401-H inverter, specification: (0-50) Hz

Blower: CZR-L80 three-phase low-noise medium-voltage fan, the motor power is 0.55 kW,

Chint Electric: contactor, switch, leakage protection air switch

Stainless steel pipes, fittings and valves

Stainless steel instrument cabinet: measurement and control, electrical equipment on the experimental rack

Stainless steel frame 1.8 × 0.55 × 1.60 meters (with casters and non-stick feet)

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