Acid-base neutralization washing tower

Equipment introduction:

       Washing tower is a kind of acid and alkali gas widely used in acid and alkali tail gas treatment, such as HCL, SO2, H2SO4 and NH3. It is widely used in PCB, CCL, TFT-LCD and other electronics industries. Waste gas treatment in deodorization, garbage deodorization, chemical and pharmaceutical industries.
       Adopting washing tower treatment, mature technology, stable operation and good treatment effect. The method can carry out multi-stage continuous processing on a variety of gas components, and it has wide adaptability. This process is suitable for treating large-volume, high-concentration acid-base gases. It is characterized by maximizing gas-liquid contact, increasing gas-liquid mass transfer rate, and achieving efficient treatment. In the chemical washing and absorbing process, the concentration and dosage of the medicament can be changed according to the change of the gas concentration and composition, thereby reducing the running cost and increasing the treatment rate.

Equipment structure:

The washing tower contains the following components:

1、The tower body part of the washing tower contains: a water storage tank, a filling layer, a dewatering layer, a window and a base.

2、The circulating water part contains: circulating water pump, sprinkler pipe, spiral anti-blocking nozzle, water level control valve and switch;

3、Dosing system contains: PH online detector, medicinal solution metering pump, medicine tank storage tank, agitator, liquid level sensor, etc .;

working principle:
       After the exhaust gas is collected by the gas collecting hood and pipes, it is introduced into the washing tower processing equipment by a centrifugal fan, and then the gas is sent to the chimney system by the centrifugal fan, and then the treated clean air is discharged at high altitude.

       The condition of the scrubber for treating the exhaust gas is that at a certain temperature and pressure, a high-pressure nozzle is installed in the equipment's circulating spray system, and the filling material is an efficient filling material, so that the spray liquid can reach an atomized state. When the gas-liquid phase comes into contact, the dissolution or absorption of the components is the main factor. As time goes on and the concentration of the absorbent in the solution increases, the absorption rate will continue to slow down, while the desorption rate will continue to increase. At a certain moment, the absorption and desorption speeds are equal, and the transfer between gas and liquid phases reaches equilibrium-phase equilibrium. When the phase equilibrium is reached, the dissolution process is stopped. Therefore, the clean washing solution needs to be replaced at this time, otherwise the components that have been absorbed in the solution may escape from the liquid phase back to the gas phase and form desorption.

Characteristics of washing tower:

1、Large production capacity --- and increase in throughput per unit cross-sectional area

2、Large production capacity --- and increase in throughput per unit cross-sectional area

3、Simple structure ------- Backwashing type and cross type, backwashing type is most suitable for small space installation; cross structure is most suitable for high altitude restricted installation

4、Stable operation and great flexibility ------- The system has a simple structure, and there are maintenance openings, and the material is generally made of anticorrosion

5、Low resistance ------- that is, the pressure drop of gas passing through the packing layer per unit height is small;

 flow chart:

1:The system is divided into manual control, automatic control and remote control: the manual startup of each device does not affect each other; the automatic control is PID-inverter-PLC-HMI control; the remote control is remote computer (upper computer) to realize automatic control.

2:Fan automatic frequency converter control (one for one use), according to the change of the differential pressure transmitter in the pipeline, automatically change the frequency value of the frequency converter. High efficiency and low power consumption.

3:Circulating pump contactor and liquid level control (one reserve and one use) set fault alarm and operation status monitoring; flow display during operation.

4:The dosing pump controls the dosing pump to start and stop according to the PH value sensor in the water tank, and the dosing barrel sets the liquid level.

5:Computer and man-machine interface monitor equipment running status and alarm status and data display.