Description of rotary dehumidifier

The treated air volume of the dehumidifier (Group) of the coupling runner is from 100 m ³/ h～60000 m ³/ h ； The regeneration air can be heated by steam, electric heating, heat transfer oil or various industrial waste heat. It is suitable for accurate control of various processes of production and manufacturing with air humidity requirements lower than 40%. The usd/drd series of runner dehumidifier (Group) can ensure the process production conditions of various low humidity requirements economically and effectively by combining the system process design and precise and reasonable control combination of the company.

         For the equipment which adopts PLC automatic control mode, namely temperature and humidity control, it is unnecessary to control manually. The user only needs to set the PLC control parameters within the range to be controlled; Because the parameter setting of PLC controller is professional, improper setting may damage the equipment or cause the equipment to fail to work normally! Please do not set it by yourself; If necessary, please change the parameter settings under the guidance of the manufacturer.

1.1 box

The usd/drd series dehumidifier (Group) adopts the profile frame structure, which has steel frame and aluminum alloy frame to choose, with beautiful appearance and strong surface treatment and corrosion resistance, which can effectively guarantee the overall strength of the equipment and the overall sealing of the equipment.

Double deck, high density (50kg/m3) polyurethane foam, with good heat insulation and high strength, the double layer anti-corrosion rubber seal is used between the movable outer wall plate and the frame.

The outer side of the cover plate of equipment box is cold rolled steel plate (indoor type) / color steel plate (outdoor type), high-pressure foam polyurethane insulation material in the middle, and galvanized plate inside; The corrosion of the outer plate can be reduced after acid cleaning, phosphating and spraying; The machine (Group) is a steel foundation structure, which is convenient for lifting the forklift during the transportation and installation of the equipment.

Spacious maintenance space, with removable panel and special pressing door plate buckle hinge door, all service areas are installed with open access doors, door plate fixed with hinge and door plate buckle, box box built-in waterproof access lamp (option), after opening, can be convenient for equipment maintenance and maintenance.

The electrical components are provided with remote monitoring connection ports (remote start-up and stop automatic control, dehumidification operation and fault signals), and the operation status of the machine (Group), motor overload, regeneration high temperature and other signal indication are provided.

The selection and design of various functional components can make the equipment run more safe, reliable and economical and environmental protection, considering the small pressure drop Zui according to the reasonable air flow organization.

1.2 treatment air part

The air inlet filters are all of the plate type primary effect filters which can slide out horizontally. The filtration efficiency is European standard EU4, and the galvanized border filter can be easily removed and cleaned. The cleaning times are 1-2 times, and if any damage is found, replace them in time（ The efficiency of filter after cleaning will decrease, which will seriously affect the protection of the unit. It is recommended that the user replace the new filter in time.)

The regeneration fan adopts the Italian comepri direct coupled backward centrifugal fan, which has the following working conditions: small installation volume, light weight, low noise and high humidity resistance. Regeneration fan adopts regeneration temperature control delay (60 ℃) to stop, so as to ensure the waste heat in the regeneration air duct is taken away, ensure the safe operation of the equipment, and effectively protect the runner from burning due to local overheating.

The standard regeneration heating method is steam heating and electric heating. Other heating methods can be adopted according to the special needs of users, such as heat transfer oil and other industrial waste heat heating.

1.3 regeneration air duct:

The standard dehumidifier regeneration air inlet filters are all made of plate type primary effect filter (EU4) which can be sliding out from horizontal side and galvanized plate frame. It can be easily removed and cleaned, and the cleaning times are 1-2 times. If any damage is found, it should be replaced in time. In order to prevent the filter from burning, the regeneration filter adopts high temperature resistant filter material to ensure the safe operation of the equipment;

The regeneration fan adopts the Italian comepri direct coupled backward centrifugal fan, which has the following working conditions: small installation volume, light weight, low noise and high humidity resistance. Regeneration fan adopts regeneration temperature control delay (60 ℃) to stop, so as to ensure the waste heat in the regeneration air duct is taken away, ensure the safe operation of the equipment, and effectively protect the runner from burning due to local overheating.

The standard regeneration heating method is steam heating and electric heating. Other heating methods can be adopted according to the special needs of users, such as heat transfer oil and other industrial waste heat heating.

1.4 runner and runner frame:

The runner and the runner box are the core parts of the dehumidifier (Group), and the structure and sealing mode have a great influence on the overall performance of the equipment

In order to ensure the equipment has strong dehumidification capacity, the runner and sealing strip are imported from abroad.

According to the process demand, the company selects the original imported dehumidification wheel from Japan. The selected dehumidification runner has good moisture absorption effect. The runner used on low dew point machine has 85% of the adsorption material, which makes the comprehensive dehumidification efficiency higher than that of the same products in the world, all of which are 10-15%.

The runner is made of special ceramic magnetic fiber composite. The composite is corrugated structure with high performance moisture absorption agent, forming many small air channels, which has large contact area with air, and improves the dehumidification efficiency.

The runner has good fire resistance. The smoke index and combustion index of the runner are zero after the E-84 Standard Test of the international authority (astme);

The compressive strength of runner is 2000kpa (2kgf/cm2), and has good compressive strength; At the same time, it can be washed with clean water;

Runner seal adopts imported matching sealing strip, which has good sealing performance, small friction resistance and high temperature resistance and durable;

1.5 working principle of runner

Fig. 1-1 principle diagram of dehumidification of runner (the structure of zone II is applicable to standard type)

Fig. 1-2 principle diagram of dehumidification of runner (three zone structure is suitable for low dew point type)

        The fresh air of the system is mixed with the return air of drying room after cooling, and the mixed air is cooled by the secondary cooling disk pipe (the secondary cooling coil pipe is not shown in the flow chart). Most of the cooling mixed air passes through the dehumidification area (the air flow is the treatment air), and a small part passes through the cooling area (the air flow is the regeneration air); The treated air flows out after drying, and the regeneration air heated by the cooling area is heated by the regeneration heater, and enters the regeneration area to regenerate the runner, and finally is discharged out of the room;

         The treated air enters the dehumidification area of the runner, and the water molecules in the air are absorbed by the moisture absorption agent in the runner. The dried air is sent to the next process through the treatment fan for temperature treatment or directly sent to the workplace.

         The runner absorbs water molecules in the fan of the treated air area and becomes saturated. It will automatically transfer to the regeneration area for high temperature regeneration, so that the runner can recover its dehumidification ability.

        After the regeneration air is taken from precooling or subcooling disc pipe, the temperature of the cooling runner is increased at the same time. After the regeneration heater reaches the set regeneration temperature, the regeneration air enters the regeneration area to complete the regeneration of the runner;

         Other supporting air treatment functional sections are configured in the system. The functions of each functional section are: the front surface cooler uses the chilled water to reduce the fresh air temperature to the pre cooling working state point, so that the relative humidity of the air is gradually approaching the saturated state, which plays the role of cooling and reducing humidity. Then mix with the return air, and the runner is to treat the humidity of the mixed air to the required humidity, so that the dry air can meet the humidity requirements required by the drying room. The cooling section of the aftersurface is to adjust the dry air temperature to the air supply temperature required by the drying room and then send it to the drying room.

1.6 safety and control devices

          The internal of usd/drd series of runner dehumidifier (Group) is equipped with safety protection measures such as filter blocking, regeneration over temperature alarm, runner stop detection, delayed shutdown of regeneration fan, etc. In case of abnormal regeneration system (fan failure or air duct blockage), when the temperature in heater reaches the set temperature value or when the runner stops running, an indication alarm will be sent out, and the electric heater will be unloaded（ When the steam or heat transfer oil is heated, the heater closing valve needs to be equipped with actuator).

         When dehumidifier (Group) stops under normal conditions, regeneration fan and runner are shut down in time under PLC controller control; After the equipment is shut down, the regeneration fan will stop automatically after the regeneration temperature is lowered to below the safe temperature.

         PLC controller or temperature and humidity controller control the humidity of dry air according to the return air temperature and humidity value of drying room; If the humidity reaches the requirement, the operation series of electric heater or the output proportion of SCR are controlled, so as to achieve the effect of energy saving; According to the temperature of return air, PLC calculates and outputs control signal to control the opening degree of ice water valve of the aftercooler, so as to control the temperature of the treated dry air within the required range; Make the air quality of the whole system within the specified range.

        In order to make the system meet the design purification requirements, all filters are equipped with pressure difference switch (option). When the pressure difference of filter is greater than the set value of PLC, alarm the operator to clean and replace the filter; If this function is not available, the user needs to clean and maintain and replace regularly (see Chapter 5).

1.7 model description of dehumidifier (Group)

Small unit:

Standard unit:

Combination series: