A general multi-mode smart adsorption drying method with low energy consumption for compressed air preparation

Abstract

The invention relates to compressed air preparation technology, and aims to provide a general multi-mode intelligent adsorption drying method with low energy consumption for compressed air preparation. The present invention is aimed at the adsorption drying system with double adsorption cylinders or multiple adsorption cylinders running in parallel. The air flow organization of the hot air flow is carried out from the upper part of the regeneration adsorption cylinder downwards to realize the regeneration of the adsorbent; it includes the regeneration stage of compressed air waste heat heating, the pressure release stage, The air blast goes deep into the heating stage and the circulation blowing cooling stage. The advantages of the present invention are: (1) low energy consumption, making full use of compression waste heat and environmental cooling capacity; (2) multi-module design, realizing multi-level dew point control); (3) multi-mode regeneration, ensuring long-term operation of the desiccant; (4) ) has adaptive adjustment capability; (5) digital energy efficiency analysis. The present invention utilizes desiccant optimization control based on real-time monitoring of the humidity of the adsorption cylinder to ensure that the overall adsorption process runs smoothly for a long time, ensures long-term stable operation of the desiccant, and greatly reduces its replacement cost.

Description

technical field [0001] The invention relates to compressed air preparation technology, in particular to a general multi-mode intelligent adsorption drying method with low energy consumption for compressed air preparation. Background technique [0002] Compressed air, as the main public engineering component of many process industries, provides corresponding gas environment parameters to the main process to ensure smooth production, and it is also a major energy consumer in the process industry. In addition to the requirements for compressed air flow and pressure, users also have requirements for compressed air quality, among which the moisture content of compressed air is a very important indicator. It is reflected in the requirements for compressed air dew point (atmospheric pressure dew point or corresponding pressure dew point) under different inflow conditions (environmental working conditions), production load and process requirements. [0003] In fact, the main proces...

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Problems solved by technology

Among them, the composite drying is oriented to the fuel injection machine and high dew point requirements. The existing problems are very clear. First, the waste heat of compression cannot be considered at all, and a freezing environment needs to be established; surge; the third limitation is that the micro-thermal process is often used in conjunction with adsorption drying, and the basic regeneration gas consumption is more than 5% of the design capacity

The main problem of no-heat and micro-heat is that the regeneration gas consumption is large, which is not suitable for the needs of sustainable development; although the micro-gas consumption has improved in terms of gas consumption and the use of compression waste heat, there are still problems in dew point and pressure drift. Obvious flaws; zero gas consumption waste heat is a continuous drying process that is completely regenerated based on compression waste heat, and realizes regeneration without gas consumption in terms of gas consumption

However, judging from a large number of current application practices, the biggest problem in the waste heat drying process with zero gas consumption is that the waste heat is seriously affected by the exhaust temperature of the main engine and the temperature of the cooling water, which makes the accuracy of the dew point unsuitable for various processes; in addition, due to the overall During the treatment process, the air is circulated internally, resulting in a high humidity load of the adsorption cylinder

The problem in the blast adsorption drying process is that the waste heat of compression and conventional cooling are difficult to be fully utilized

Vacuum adsorption drying is quite advanced in theory, but in the actual process, the maintenance of vacuum and the state of the adsorbent are the difficulties.

[0006] In summary, from the analysis of various adsorption drying processes currently implemented, there is a lack of a low-energy, high-precision post-treatment process system that makes full use of waste heat and has wide versatility.

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