Many friends found that the humidity did not reach the target set value when using the rotary dehumidifier, so they had doubts about what to do if the dehumidifier was not effective. In fact, to really solve this problem, we must analyze it from three angles.

Angle 1: Is the humidity unable to decrease due to improper setting?

For example, customers communicate with the manufacturer of the rotary dehumidifier at the time of purchase. At first, they said that the requirement was 20-40%, but in actual use, the humidity was set to 10% or even lower, and the normal humidity could not be reduced. Another possibility is that the cooling temperature in the device is set too high or the regeneration temperature is set too low, which will also lead to the above results.

Angle 2: Is it because of improper collocation (small equipment capacity)

If it is the first time for the new machine to operate, the possibility of wrong parameter setting and poor insulation seal can be ruled out. If the relative humidity in the environment cannot be reduced effectively and quickly, it is likely that the unit selected by the manufacturer does not match the current load. There are many factors that affect the performance of rotary dehumidifier. Among them, the parameters of the runner are determined by the runner manufacturer. Dew point temperature of treated air after dehumidification is an important control parameter.

Angle 3: Is it because of lack of maintenance?

If a brand-new rotary dehumidifier runs well in the initial stage of use, its performance will begin to decline gradually to eliminate the service life of the rotary wheel. With the global energy and environmental problems becoming more and more prominent, the advantages of dehumidification have been recognized and gradually developed, and the rotary dehumidifier is one of the key equipment. Only by knowing the performance of the machine can we choose and use it better. There are many factors that affect the dehumidification performance of the rotary dehumidifier, such as the mass fraction, thickness, specific surface area, particle size, temperature, rotating speed of the rotary wheel and fan angle in the regeneration zone.

Rotary dehumidifier manufacturer

1, the influence of hygroscopic agent content

The flow channel is composed of supporting material and hygroscopic agent, and the percentage of hygroscopic agent in the total mass is called the mass fraction of hygroscopic agent, which is in the range of 0~0.6, and the influence ability is greatly weakened after exceeding 0.6. In practical application, the mass fraction of hygroscopic agent usually takes the value of 0.8~0.85. Reducing the proportion of metal supporting materials can also effectively reduce the total heat capacity of dehumidification runner, which is beneficial to improve the dehumidification performance of runner system.

2. The influence of runner's speed

Increasing the rotating speed can enhance the heat exchange effect, but it will reduce the dehumidification effect, because the residence time of absorbent in the regeneration zone becomes shorter and it cannot be completely regenerated. If the rotating speed is too low, the absorbent will stay in the dehumidification area for too long, which will lead to the absorbent in some areas near the regeneration area losing its ability to continue dehumidification due to saturation, and will also reduce the dehumidification effect. Starting from the customer's dehumidification demand, combined with factors such as fresh air volume and on-site humidity, it is a key step to choose the appropriate speed.

What is the influence of regeneration air parameters?

The desorption and regeneration performance of the absorbent in the dehumidifying wheel is mainly reflected in two aspects: first, the drying state that the absorbent can finally reach depends on the equilibrium water content of the absorbent; Second, the regeneration rate of reaching the final drying state, including the vaporization rate on the surface of absorbent and the diffusion and transfer rate of moisture inside absorbent, depends on the main influence parts of the above two rates and is mainly dominated by the process with lower rate; Equilibrium moisture content and regeneration rate are interactive, and people pay attention to the influence of regeneration rate in application research. ?

The regeneration process of adsorbent in rotary dehumidifier is essentially a process of driving water out of adsorbent and entering regenerated air. The regeneration process of absorbent is mainly influenced by two factors: absorbent and hot air. The influence of moisture absorbent parameters on the performance of dehumidifier is mainly reflected in the shape, placement mode and temperature of moisture absorbent. The influence of hot air parameters on the performance of dehumidifier is mainly reflected in temperature, moisture content, flow rate, contact with moisture absorbent and so on. In practical application, the parameters of regenerated air are easier to control, so people pay more attention to the influence of regenerated air on the performance of dehumidifier: under the condition of certain air moisture content, increasing air temperature can not only strengthen the ability of evaporation and taking away moisture, but also further increase the temperature of absorbent and increase the diffusion rate of moisture between the surface and the inside of absorbent, which is beneficial to both constant-speed drying stage and deceleration drying stage, but each absorbent has the highest allowable temperature value; The lower the moisture content in the air, the stronger the ability of absorbent to take away moisture, and the greater the driving force of drying process, so the higher the drying rate; Increasing the velocity of hot air can effectively strengthen the drying process, which is beneficial to heat and mass transfer, but the air velocity is large and the contact time with moisture absorbent is short, which reduces the effective utilization of heat energy. Good contact between air and hygroscopic agent is beneficial to drying uniformity of hygroscopic agent, reasonable arrangement of air flow and larger gas-solid contact area, which can effectively strengthen the regeneration process. The following focuses on the influence of temperature, humidity and regeneration air flow on the performance of rotary dehumidifier. ?

3.2. 1 What is the influence of inlet regeneration air temperature?

Regenerated air temperature is an important parameter that directly affects the performance of rotary dehumidifier. If the regeneration temperature is low, the total heat exchange process is mainly carried out in the runner. With the increase of temperature, the desorption and regeneration trend of absorbent in the flow channel is gradually obvious until the whole process is controlled by the desorption and regeneration trend. People hope to make full use of low-grade heat source as the energy source for desorption and regeneration of runner. Low-grade energy may not have high temperature, which makes the regenerated air heated to a limited extent. How the temperature of regenerated air affects the performance of rotary dehumidifier, and when the temperature of regenerated air drops to what value, the dehumidification process can still be guaranteed. These are all issues that people care about. Therefore, how to determine the influence of regeneration air temperature on the performance of the rotary dehumidifier, how to judge whether the heat and mass transfer process in the rotary wheel is a total heat exchange process or a moisture absorption-desorption regeneration process, and where is the boundary point between the regeneration temperature and the two is one of the focuses of this paper. ?

In the rotary total heat exchanger, the main process of two streams of air is to transfer the moisture in the treated air to the regenerated air and raise the temperature at the low temperature side. At this time, the mathematical model of rotary dehumidification should be changed to the mathematical model of total heat exchanger. Moreover, because the most suitable hot air sector angle jR for the total heat exchange process is 1800, if the regeneration sector angle jR is still set to 900 according to the dehumidification process at this time, the total heat exchange process cannot be carried out efficiently; In addition, the rotation speed of the rotor as a total heat exchanger is much faster than that required by the dehumidification rotor [19]. These are all problems that must be considered in studying the dehumidification process of the runner. Basically because of the lack of proper maintenance.