Absorbing tower

Abstract

The invention relates to an absorbing tower. The absorbing tower comprises a tower body, a first porous plate, a second porous plate, a first filter screen, a second filter screen and a molecular sieve bed, wherein the tower body is provided with an air inlet and an air outlet, the first porous plate and the second porous plate are arranged at the place in the tower body close to the air inlet and the air outlet respectively, the first filter screen and the second filter screen are arranged on the first porous plate and the second porous plate respectively, and the molecular sieve bed is arranged between the first porous plate and the second porous plate, the absorbing tower further comprises a guide flow plate and an air cylinder pressing device, the guide flow plate is arranged between the air inlet and the first porous plate and used for guiding the air flow to four sides of the bottom part of the tower body, and the air cylinder pressing device is arranged at the upper part of the molecular sieve bed and used for downwards pressing the molecular sieve bed. On the one hand, the absorbing tower provided by the invention adopts the guide flow plate installed in the tower body and closing to the air inlet and the air outlet, so that the uniform distribution of the air flow is realized; on the other hand, by adopting the air cylinder pressing device, the gas in the molecular sieve bed is prevented from loosing or sinking. Besides, the absorbing tower is simple in structure and low in cost.

Description

technical field [0001] The invention belongs to the technical field of gas production, and in particular relates to an adsorption tower for gas production. Background technique [0002] In modern industry, the technology of adsorption and separation of gas by adsorption tower is widely used in petrochemical, pharmaceutical, metallurgy, electronics and other industries, such as gas separation, drying and air purification, wastewater treatment, oxygen and nitrogen production, etc. Adsorption materials in the adsorption tower generally use molecular sieves. Molecular sieves can adsorb one or several components in the mixed gas raw material. When the gas passes through the adsorption tower, one or several components are adsorbed, and other components flow out. be separated to achieve the separation effect. [0003] like figure 1 As shown, the existing adsorption tower for gas production generally includes a tower body (1') with an air inlet (10') and a gas outlet (11'), and is...

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Problems solved by technology

[0003] such as As shown in Figure 1, the existing adsorption towers for gas production generally include a tower body (1') with an air inlet (10') and a gas outlet (11'), and a tower body (1 ') two perforated plates (2') near the air inlet (10') and the air outlet (11'), the filter screen (3') laid on the perforated plate (2'), and the filter set on the filter The bead (4') on the net (3'), the bolt (5') that is used to fix the perforated plate (2'), the filter screen (3') and the bead (4') and be arranged on two perforated plates (2 ') between the molecular sieve beds (6'), wherein the perforated plate (2') is generally flat, and the air inlet (10') is relatively small, and the intake air flows into the tower body (1 ') and then rushes directly into the perforated plate (2') and enters the molecular sieve bed (6'), the airflow diffusion area is small, and the airflow cannot be evenly separated, so there is uneven distribution of the airflow in the adsorption tower, resulting in insufficient utilization of the molecular sieve in the adsorption tower, local The high air flow rate will easily cause the pulverization of molecular sieve particles and reduce the service life of molecular sieve

At the same time, the airflow is concentrated and blown to one place, which may easily cause local overload of the molecular sieve and reduce the utilization rate of the molecular sieve

At the same time, the flat porous plate structure is adopted, and the space at the bottom of the adsorption tower that cannot be filled with molecular sieves is greatly increased (commonly known as dead space), which reduces the effective utilization of the adsorption tower volume. Due to the increase of this part of the space, the amount of gas discharged during regeneration is caused. increase, resulting in the loss of compressed gas

[0004] In the adsorption tower with the above structure, after a long period of operation, the carbon molecular sieve bed layer will more or less wear and sink. After the molecular sieve layer is loose, It is easy to generate gas "channeling", and at the same time, the adsorbent will move and pulverize due to looseness, which reduces the adsorption efficiency of the adsorption device and seriously affects the entire adsorption process. The so-called channeling phenomenon refers to the formation of a short circuit when the gas passes through the bed. A large amount of gas rises through the channel without being in contact with the molecular sieve. After the channeling phenomenon occurs, the gas flow density of the molecular sieve layer is uneven and the phase contact is poor, which is not conducive to the heat transfer, mass transfer and chemical reaction between the gas streams. At the same time, due to some Molecular sieves do not work properly, particles in this layer cannot be suspended in the air flow, and the process deteriorates severely

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