Zeolite molecular sieve powder, black...How to do?Look here, look here!!!

1) quality of zeolite molecular sieve.
The molecular sieve generally requires that the compressive strength is greater than 20N, the wear rate is less than 0.5%, and only the strength can meet the requirement to withstand the impact of the airflow during the transition of the bed layer.

(2) moisture contains a lot of free water.
The moisture is not fully separated before entering the drying tower and it contains a lot of free water. The free water directly and the zeolite molecular sieve contact will be released in a large amount of heat, damaging the zeolite molecular sieve structure.
At the same time, free water also increases the pressure drop of the bed layer, and the zeolite molecular sieve produces relative motion, causing the zeolite molecular sieve to wear out and shorten the service life.

(3) regeneration switch is too fast.
When the zeolite was regenerated and switched, the pressure in the tower was too fast, causing the zeolite to become a powder in the larger displacement in the tower.

(4) the zeolite and steel containers have different expansion coefficients.
This results in the displacement and wear of zeolite molecular sieve.

(5) with a restructuring at the top of the tower to adsorb surface of zeolite molecular sieve, molecular sieve pore blockage, after repeatedly heating regeneration, coking phenomenon occurs, and the coke and the thermal expansion coefficient of zeolite molecular sieve, zeolite molecular sieve expansion and broken.

(6) drying the top (or bottom) of the distributor of damage or congestion, into drying tower gas is not evenly distributed, the zeolite molecular sieve the magnitude of the impact throughout the zeolite molecular sieve bed distribution, flow, friction and zeolite molecular sieve into powder.

(7) due to the device when the feed gas composition and device design changes, volatile gas, make into molecular sieve gas composition is heavier, compressor outlet carrying impurities such as lubricating oil, the molecular sieve for restructuring and organic matter in natural gas has the strong and the preferential adsorption ability, when the molecular sieve adsorption and purge the long running below 40 ℃, not separation in gas clean the restructuring of the points and will be a large number of sedimentary organic matter in the surface of the molecular sieve, after a long repeated around 280 ℃ heating regeneration process, the reorganization of the branch carbide agglomerate occur, so that the molecular sieve black lumps.

Solutions:
(1) select the high quality molecular sieve when selecting zeolite molecular sieve.

(2) sudden increase in natural gas dew point due to fluctuating gas volume.
In order to ensure the normal condition of the instrument and equipment, the regeneration time can be extended appropriately and the regeneration gas quantity can be increased.

(3) according to the specific parameters of zeolite molecular sieve adsorption and regeneration, purge the process parameters in real-time correction, avoid the parameters such as temperature, velocity, pressure, setting is not correct to the destruction of the zeolite molecular sieve.

(4) before entering the drying tower process more efficient coalescer or other efficient degreaser, in order to try to separate the moisture contained in the production process of liquid water and heavy hydrocarbon, reduce the rate of zeolite molecular sieve is polluted.

(5) keep the pressure of the drying tower as smooth as possible to avoid large vibration.

(6) to avoid the frequent drying tower when switching buck too urgent of the violent vibration and friction brings to the bed, recommend switching valve using zeolite molecular sieve - three stem valve, special valve when the valve opening, the valve body limit the maximum differential pressure on either side of the valve, thereby avoiding zeolite molecular sieve bed impacted by high pressure differential air accident, also appear so as to prevent water inlet, ensure the security of the system.

(7) change the process flow, dry air and the mixture of dry gas and moisture, reduce the loss of water in the process of cold blowing and the pollution of heavy hydrocarbon to the molecular sieve.

(8) change the form of the adsorption tower sieve plate, and replace the loss and vibration of the zeolite molecular sieve in the long-term operation of zeolite by using the form of the spring self-compensated compression type or auxiliary tank.

(9) using activated alumina as the protective layer of zeolite molecular sieve.
In the upper layer of zeolite molecular sieve, the active alumina is added and the liquid water, liquid hydrocarbon and other organic materials are adsorbed in the gas.

(10) regularly use high temperature water vapor as a reanimation, to regenerate the drying tower to remove the recombinant and other organic impurities that are adsorbed on the surface of zeolite.