About Century SenlangUC2500Absorption desorption device，Low melting point solvents have the characteristics of extremely low volatility and designable functionality. Currently, we have demonstrated their effectiveness through steady-state absorption experimentsVOCsHas a high absorption capacity. Given that dynamic absorption performance and cycling performance are key indicators for measuring the mass transfer performance and economy of absorbents, it is necessary to further develop dynamic absorption-Desorption experiment. By absorbing-Investigating the influence of gas-liquid ratio and absorption theoretical order on gas absorption rate on desorption device, as well as the influence of desorption temperature and pressure parameters on the regeneration performance of absorbent, optimizing the absorption and desorption parameters in dynamic absorption process, and guiding the scaling up of experiments. The device mainly consists of an absorption tower, desorption tower, pump, etc., which can absorb-Desorption can operate continuously or independently in a single tower. absorb-Desorption device shall be safe, practical, reliable and progressiveness. Due to the fact that desorption is carried out under negative pressure conditions, the desorption tower must meet the requirements for airtightness; There is a certain pressure difference between the absorption tower and the desorption tower, so the selection of pumps should meet the pressure difference requirements. In addition, the device should also meet the appearance requirements of clear wiring and reasonable and beautiful layout.

Process principle and system functional requirements of UC2500 absorption desorption device

The absorption desorption device includes an absorption system and a desorption system, and its working principle is based on the change in gas solubility at different pressures to achieve mass transfer between VOCs gas and absorbent. The absorption system is a place where gas and absorbent come into contact to complete the recovery of target products in the gas. It consists of a gas distribution system, an absorption tower, a lean solution pump, a rich solution pump, and valves. The gas distribution system is controlled by a gas mass flow meter to achieve concentration and flow control of the mixed gas; The mixed gas enters the absorption tower from the lower part and comes into countercurrent contact with the absorbent sprayed from the upper part to complete the absorption of the target gas; The purified gas after absorption is discharged from the top of the tower, and the rich absorption liquid is introduced into the desorption system from the bottom of the absorption tower through the rich liquid pump. The desorption system is a place for regenerating absorbents, consisting of a desorption tower, a vacuum pump, and valves. The rich absorption solution enters from the top of the desorption tower and flows from top to bottom. Under negative pressure, the dissolved VOCs in the rich absorption solution are continuously desorbed and pumped out from the top of the tower by a vacuum pump. The resulting lean absorption solution is circulated from the bottom of the desorption tower back to the top of the absorption tower by the lean solution pump for reuse, thus completing an absorption desorption cycle.

Functional requirements for UC2500 absorption desorption device system

The absorption desorption operation operates under negative pressure or atmospheric pressure, therefore the overall airtightness of the device should be ensured; The pumps and valves between the two towers should meet the requirements for differential pressure operation. The absorption tower and desorption tower can meet the requirements of continuous operation and combined use to evaluate the real-time absorption desorption performance of the absorbent; At the same time, it can also meet the requirements of single tower operation to evaluate the absorption or regeneration performance of the absorbent separately.

Functional requirements for the gas distribution unit: Set up three intake channels with flow rates of 70-80NL/h, 20-30NL/h, and 1-3NL/h, respectively. Each flow meter should have the same accuracy to ensure the accuracy and stability of gas concentration and flow rate; A manual sampling port is installed after the gas distribution unit to determine the composition of the imported gas and the parallelism effect of multiple mixing of specific component gases. Functional requirements for absorption tower: The absorption tower adopts a separate connection between the tower body and the tower kettle, which is easy to disassemble and replace the packing; Install a wire mesh demister at the top of the absorption tower; Install a spray nozzle at the inlet to increase the gas-liquid contact area; Pressure sensors and unloading valves are installed on the top of the absorption tower; The absorption tower body adopts double-layer jacket glass; Fill the absorption tower with loose packing material, with a theoretical stage greater than 20; The residence time of gas in the absorption bed is greater than 10 seconds; a liquid level gauge is installed in the tower kettle, and a drain valve is installed in the tower kettle to facilitate the emptying of the liquid phase. Functional requirements for desorption tower: The desorption tower adopts a separate connection between the tower body and the tower kettle, which is easy to disassemble and replace the packing; Install a wire mesh demister at the top of the desorption tower; Install a spray nozzle at the inlet to increase the gas-liquid contact area; A precision pressure gauge, pressure sensor, and unloading valve are installed at the top of the desorption tower; The desorption tower body adopts double-layer jacket glass; Fill the desorption tower with loose packing material, with a theoretical stage greater than 20; The tower kettle is equipped with a liquid level gauge and a drain valve to facilitate the emptying of the liquid phase. Functional requirements for the rich liquid pump: A damper should be installed at the outlet of the rich liquid pump to ensure smooth flow; Due to the absorption tower pressure being higher than the desorption tower and the pump inlet pressure being higher than the outlet pressure, in order to avoid affecting the accuracy of flow measurement, a back pressure valve is added at the pump outlet to meet the positive differential pressure before and after the pump. Functional requirements for lean liquid pump: A damper should be installed at the outlet of the lean liquid pump to ensure smooth flow.

Technical requirements for UC2500 absorption desorption device

The absorption desorption device is designed to investigate the absorption performance of VOCs by absorbents, with a maximum gas processing capacity of 100L/h and a maximum gas-liquid ratio of 10. The overall design of the device should meet experimental requirements, namely to investigate the theoretical stage of the absorption tower, the dynamic absorption effect of gas-liquid ratio, and the influence of the theoretical stage, pressure, and temperature of the desorption tower on the regeneration effect of the absorbents. The entire device adopts domestic brands and meets the requirements of airtightness. The pumps and valves can meet the pressure and flow regulation needs of the device, and the instruments and pipelines can meet the pressure and temperature monitoring of the absorption desorption device, as well as the manual sampling and testing needs of the gas inlet and outlet.

The UC2500 absorption desorption device is equipped with leakage protection and real-time monitoring devices for temperature, pressure, and liquid level to ensure the normal and safe conduct of the experiment; Ventilation openings are installed at the gas sampling and emission points in the device to ensure no gas leakage; The design and installation of the device must meet the HSSE requirements of Sinopec.

Technical requirements for the main equipment units of UC2500 absorption desorption device:

(1) Absorption tower:

Absorption temperature: 10-40 ℃

Design temperature: 60 ℃

Absorption pressure: 0.1~0.5MPa

Design pressure: 0.5MPa

Maximum gas processing capacity: 100L/h

Maximum flow rate of absorbent: 10L/h

Inner diameter of tower section: ≤ 50mm

Tower section height: ≤ 1500mm

Packing height: ≤ 1200mm

Material: jacketed quartz glass

Tower kettle capacity: 5L

(2) Desorption tower:

Desorption temperature: 10~80 ℃

Design temperature: 100 ℃

Desorption pressure: 0~0.1MPa

Design pressure: 0.5MPa

Maximum gas processing capacity: 100L/h

Maximum flow rate of absorbent: 10L/h

Inner diameter of tower section: ≤ 50mm

Tower section height: ≤ 1500mm

Packing height: ≤ 1200mm

Material: jacketed quartz glass

(3) Lean liquid pump

Maximum range: 10L/h

Inlet pressure: 0~0.1MPa

Export pressure: 0.1~0.3MPa

Operating temperature: room temperature

(4) Rich liquid pump

Maximum range: 10L/h

Inlet pressure: 0~0.3MPa

Export pressure: 0.1~0.3MPa

Operating temperature: room temperature

The UC2500 absorption desorption device is designed and manufactured in accordance with ISO standards.

All components and instruments in the system are measured using international unit standards.