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Tower switching method

An adsorption tower and manual switching technology, applied in the field of cutting towers, can solve problems such as inability to continue production, unclean compressed air, and unqualified product gas

Pending Publication Date: 2021-11-12
山东红枫环境能源有限公司
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  • Abstract
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Problems solved by technology

[0006] At present, the automatic control system of the pressure swing adsorption system is mainly used for the control of the normal operation of the pressure swing adsorption system. The valve body gasket is not tightly sealed, and the valve cannot be opened and closed normally, and the valve has internal leakage and other faults.
Once a failure occurs, the pressure of the PSA system will be disturbed, resulting in unqualified product gas, which needs to be shut down for maintenance, unable to continue production, and also causes waste of biogas energy

Method used

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Embodiment Construction

[0033] To facilitate understanding, the biogas adsorption purification system (hereinafter referred to as the normal adsorption mode) without the configuration of the tower cutting program will be described below. The tower cutting here is not the switching of steps between the adsorption towers, but the operation mode of the whole tower in Switch between tower reduction operation modes.

[0034] Regarding the adsorption tower, its commonly used terms are as follows:

[0035] Adsorption: Open the inlet valve and outlet valve of the tank, and the biogas will pass through the tank continuously and stably under a certain constant pressure. The adsorbent in the tank will absorb the carbon dioxide in the biogas, so that the gas becomes methane with a content of more than 95%, which meets the second category The product gas of natural gas, that is, the adsorption stage.

[0036] One average drop: It is expressed as the first pressure drop of the tank body of the adsorption tower in...

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Abstract

The invention discloses a tower switching method which is suitable for a biogas purification pressure swing adsorption system. An all-tower operation mode and a reduced-tower operation mode are configured for the system in advance. The tower switching method comprises the following steps of: monitoring the system in real time, if a certain adsorption tower fails, isolating the failed adsorption tower from the system, and switching the system from an all-tower operation mode to a reduced-tower operation mode, the number of the adsorption towers participating in operation in the reduced-tower operation mode being one less than the number of the adsorption towers participating in operation in the all-tower operation mode. On the basis of the tower switching method, maintenance can be carried out without stopping production when a certain adsorption tower breaks down.

Description

technical field [0001] The invention relates to a tower cutting method applied to a pressure swing adsorption system. Background technique [0002] PSA (Pressure Swing Adsorption, Pressure Swing Adsorption), which was founded in the 1960s, is a mature, important and widely used gas separation method, and it is also an important process for biogas purification to natural gas standards. The components are methane and carbon dioxide. The main function of PSA is to use adsorbent to absorb carbon dioxide in biogas, so as to increase the concentration of methane gas, make its calorific value reach the standard of natural gas, and realize the utilization of biomass energy. [0003] With the shortage of energy in the world, countries and industries pay more and more attention to the development and utilization of low-grade resources. In recent years, countries have higher and higher requirements for environmental pollution control. Compared with the technology of chemical absorption...

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Application Information

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IPC IPC(8): B01D53/047
CPCB01D53/047B01D2258/05B01D2257/504B01D2259/40007B01D2259/40011B01D2259/40064B01D2259/40066Y02C20/40
Inventor 李梁曲文琛刘德云潘建强丁功安
Owner 山东红枫环境能源有限公司