Technical requirements for rapid cooling tower and alkali washing tower

key word; Rapid cooling tower, alkali washing tower, deacidification tower, dry deacidification tower

1、 Gas parameters

Airflow: 24000m³/H flue gas inlet temperature: 850 ℃ flue gas outlet temperature: 150 ℃

Inlet concentration: SO2-24g/ m³,， HCL-170mg/m³,

2、 Technical requirements

Characteristics and performance of rapid cooling tower

The lining is made of acid and alkali resistant refractory materials, which are not easily detached and easy to maintain

The nozzle adopts a circulation type, and the material is made of high-temperature resistant hard alloy.

Automatically adjust the water spray amount according to the temperature, use a water pump and compressed air to atomize the inlet water, so that the water spray evaporates completely and does not form mud or mud lumps due to dust accumulation.

The outlet temperature of the flue gas is less than 200 ℃, and the flue gas entering the tower is uniform.

Including: preparation and supply device for acid-base solution in the rapid cooling tower.

(1) First level rapid cooling tower: cooling and removing some acidic components. The tower body is made of carbon steel lined with granite, including spray layer, nozzle, circulation pump, valve, instrument, valve, pipeline, platform ladder, etc.

(2) Secondary alkali washing tower: removes acidic components, the tower body material is PP, including spray layer, nozzle, demister, circulation pump, valve, alkali solution tank, dosing device, instrument, valve, pipeline, platform ladder, etc.

3、 Export control indicators

Export concentration: SO₂-100mg/ m³,， HCL-30mg

Disadvantages of commonly used hazardous waste gas purification systems:

Severe corrosion of the system: The rapid cooling tower is a strong acid mist generation tower. Two fluid atomized particles cannot completely evaporate into "dry" gas within "1 second"

Strong pitting corrosion: Residual liquid droplets adsorb a large amount of acidic substances during the smoke flight process and become acid droplets, floating to the surface of filter bags and equipment

● nozzle deviation or blockage: especially when using hard water or dilute alkali solution, scaling or blockage of the nozzle due to high temperature;

Short lifespan of the tower body: The rapid cooling tower experiences a "wet tower" phenomenon, leading to cracking of the inner lining and corrosion of the tower body due to condensation of acidic gases on the inner lining of the tower body;

● High system resistance: due to high flow rate in the dry deacidification tower, combined kinetic energy of lime movement, long process chain, high ash adhesion rate and thickness of filter bags, etc

Low efficiency of activated carbon: Activated carbon also adsorbs water vapor and powder. The large amount of lime powder and partially dried water vapor added blocked the adsorption channel

High failure rate of monitoring and dynamic equipment: Monitoring and dynamic equipment exposed to acid mist

Potential threats to water systems, soil, and crops: There are no heavy metal and dioxin control requirements for wastewater discharge from hazardous waste projects, and there is a lack of national laws.

Ultra low emissions: schematic diagram of incineration flue gas purification system

Technical advantages

● Ultra low emission standards

To curb the potential huge threat of the project and become a model of conscientious environmental protection:

No water system discharge, curb the damage of heavy metals and dioxins to surrounding water systems, soil, and even crops

No need for sewage treatment system, reducing equipment investment, maintenance, and operating costs:

All washing water, circulating water, rainwater, high salt wastewater from hazardous waste projects, waste alkali liquid, and waste alkali in the workshop are sent to the rapid cooling deacidification tower for drying and evaporation

No wet tower or acid mist phenomenon, greatly reducing the corrosiveness of the system

The acid removal rate of the preceding deacidification tower is over 98%, and all flue gases have reached a completely dry state;

Disposal of odorless high salt wastewater, increasing profit margin:

Magnetic field driven centrifugal atomizer is the basis of centrifugal spray drying, which adapts to the working conditions of various liquid fluids with high viscosity. Dry high salt wastewater;

● Improved the efficiency of using activated carbon:

The dust reduction effect of the deacidification tower, the absence of lime powder in the system, and the absolute evaporation and drying of flue gas improve the effective adsorption rate of activated carbon

Extended the service life of filter bags and pulse valves:

The drying function of the deacidification tower enables the flue gas to become a uniform "dry" hot gas, preventing pitting corrosion; The dust reduction function greatly reduces the pulse frequency of the filter bag;

The equipment failure rate is extremely low

At the same time as coming into contact with the liquid, the flue gas is already deacidification and drying, which causes minimal corrosion to dynamic mechanisms such as detection and execution, resulting in a low failure rate;

The system has low resistance to smoke circulation

The pressure drop of the deacidification tower is 600Pa, and there is no wet blockage caused by two fluid atomization. There is no condensation blockage caused by the waste liquid from the washing tower, and the waste liquid is directly dried into solid and gas phases.