How to choose condensation recovery and adsorption recovery? In one sentence, the tail gas with high concentration, recovery value and single component is preferentially condensed; the tail gas with low concentration and large air volume is first enriched by adsorption and then desorbed for recovery; the two routes do not conflict and are often used in combination in engineering. The core of the selection is to match the exhaust gas concentration, composition and recovery target, not just to see which process is advanced.
Condensation recovery depends on cooling to directly condense gaseous solvent into liquid, condensate is the recovered substance, with short route and direct product. The recovery rate is restricted by the condensation temperature, and the medium with high boiling point and high concentration has better condensation effect.
Adsorption and recovery rely on porous materials to enrich the low concentration solvent in the adsorption bed, saturated with hot gas flow or steam desorption, desorption gas and then through condensation and liquefaction recovery. It solves the problem that the exhaust gas with large air volume and low concentration "cannot be collected.
The adaptation interval of the two routes is the first basis for selection, and the comparison is shown in the table below:
| comparison dimension | Condensation recovery | adsorption recovery |
|---|---|---|
| Applicable concentration | Medium and high concentration, the higher the inlet concentration, the more cost-effective | Low concentration and large air volume, first enriched and then recycled |
| recovery product | Direct recovery of condensate | Recovery of desorption gas after condensation |
| Main energy consumption | Refrigeration capacity | Desorption heat source and fan |
| Main Consumables | Refrigerant and heat exchange surface maintenance | Periodic replacement of adsorbent material |
The main operating cost of the condensation route is the refrigeration power consumption, the lower the condensation temperature, the higher the energy consumption, the selection according to the emission requirements of the condensation depth, not to pursue the limit recovery rate blindly deepen the low temperature section.
The main cost of the adsorption route is the desorption energy consumption and the periodic replacement of the adsorption material, the wind volume is large, the fan power consumption ratio is high. When accounting, both items are amortized into the annual operating account, and then the value of the recovered solvent can be compared to obtain the true cost performance.
The high concentration section condenses and collects the main volume first to reduce the concentration of tail gas. The low concentration tail gas at the end is enriched in the adsorption bed, and the desorbed gas with high concentration is returned to the condensation section for secondary recovery. In this way, condensation is responsible for "harvesting the head" and adsorption is responsible for "sweeping the tail". Each of the two routes has its own strengths.
No. Most mixed conditions are more suitable for combination configuration, condensation and adsorption are responsible for segmentation, the project has a mature practice, according to the actual concentration distribution design can be.
The purity of the condensate is related to the complexity of the tail gas components, and the recovery effect of a single component is good; the mixed component recovery liquid is generally separated or refined before reuse, and the specific test data shall prevail.
It’s not worth it. The dilution of air volume will pull the condensation load very high, the refrigeration power consumption is large and the recovery amount is small. It is more economical to adsorb and enrich this kind of working condition first.
LuoyangWohong PetrochemicalEquipment Co., Ltd. provides design, manufacture and selection consultation of condensation, adsorption and combined solvent recovery devices. Welcome to contact and exchange.
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