1、 Product Overview

Explosion proof gas refrigerated dryer is made of explosion-proof structure according to the relevant provisions of the national standards of the People's Republic of China. It is a device that removes moisture from compressed air and reduces air humidity. It has the characteristics of beautiful appearance, compact structure, and simple operation. Applicable to explosive hazardous areas where there is or may be a mixture of Class IIA, IIB, IIC, T1 to T4 combustible gases, vapors, and air in the factory.

Our company has rich design and manufacturing experience in special gases (including biogas, oil and gas, coal gas, wellhead gas, natural gas, etc.) and has a wide range of application fields.

1. The electrical box is explosion-proof, with an explosion-proof rating of EXDIIBT4, and an explosion-proof certificate is provided.

2. The switch, indication, and control of the refrigerated dryer are located on the explosion-proof box.

3. The refrigerant compressor shall be explosion-proof treated by a professional explosion-proof qualified manufacturer.

4. The material of the heat exchanger shell is stainless steel

2、 Technical parameters of the crew

Inlet temperature: ≤ 45 ℃ (≤ 80 ℃ can be customized)

Work pressure: 0.6~1.0MPa

Environmental temperature: 2-45 ℃

Pressure dew point: 0~10 ℃ (0.7MPa)

Cooling water temperature: ≤ 32℃

Cooling water pressure: 0.2~0.4MPa

Installation method: Indoor, concrete floor, with a reserved space of ≥ 1m around.

Product Category: Air Handling Capacity, Compressor Power, Cooling Water Circulation Capacity, Fan Power, Product Code

Nm3/h kW t/h W

Water cooled refrigerated dryer 6~550 2~120 0.9~93.5--- KPRD-S/HW

Air cooled refrigerated dryer 1.2~440 0.8~120~- KPRD-S/HA

Explosion proof grade ExdmbibIIBT4

3、 Working principle of the unit

Working principle: A refrigerated air dryer is based on the principle of air freeze-drying, using refrigeration equipment to cool compressed air to a certain dew point temperature, precipitate the water in the supersaturated part under this temperature and pressure, and carry dust. The water is discharged by an automatic drain to achieve the purpose of cooling and drying.

The process flow is divided into two parts: air system and refrigeration system:

Air system: Dry gas below 45 ℃ first enters the energy recovery device for pre cooling and removal of some moisture, and then enters the evaporator to reduce the temperature to 0-10 ℃ (dew point temperature). The moisture in the dry gas completely condenses into liquid at this temperature, and then separated by a gas water separator. The moisture is discharged by an automatic drain valve, and the low-temperature dry gas treated in this way enters the energy recovery device for heat exchange with untreated compressed hot dry gas. The compressed hot dry gas is pre cooled, and at the same time, its own temperature rises and is output, which is the treated dry compressed gas.

Refrigeration system: Low temperature liquid refrigerant absorbs heat in the evaporator and becomes a gaseous state. After passing through the gas-liquid separator, it enters the compressor, compresses and enters the condenser, where it condenses into high-pressure liquid refrigerant. It then passes through the expansion valve and becomes a low-temperature, low-pressure liquid before entering the evaporator to cool the compressed gas. The gas-liquid separator ensures that the refrigerant entering the compressor is in a gaseous state, thereby ensuring the normal operation of the compressor; The dew point temperature sensor after the evaporator PLC、 The hot gas bypass valve and three-stage adjustable screw compressor form an energy automatic balance regulation system, ensuring the stability of dew point temperature and effectively achieving the rational use of energy according to changes in the cold and hot loads of the dry gas system.

4、 Structural characteristics of the unit

Main structural characteristics

The dry gas system mainly consists of an energy recovery device, an evaporator, and a gas water separator;

The refrigeration system is the main working system of the freeze dryer, and its working condition directly affects the operation of the freeze dryer. It mainly consists of a compressor, water-cooled condenser, evaporator, oil separator, energy-saving device, and gas-liquid separator;

The control system adopts programmable controllers and touch screens for control.

5、 Selection instructions

1. All technical parameters provided in the table are calculated based on the rated intake temperature of 38 ℃ and pressure of 0.8mPa. When selecting relevant data, it is recommended to fully consider the possibility of its changes based on the actual usage status.

2. The unit uses refrigerant, and the standard configuration is: R22， But it can also provide users with other types of green and environmentally friendly refrigerants, such as R407c, R134a, etc.