The horizontal PP scrubber is a common gas purification treatment equipment, mainly used for industrial waste gas purification, dust pretreatment, cooling and absorption of some water-soluble pollutants. The equipment adopts a horizontal structure, which is suitable for sites with limited installation height or where horizontal layout is required.

The working process is similar to the principle of gas scrubbing. After the waste gas enters the tower, it is purified through spraying, diversion, gas-liquid contact and defogging. The equipment can be equipped with multi-stage spray, water storage area, air guide structure and filter components according to actual working conditions.

1. Problems with traditional horizontal scrubbers

Some traditional horizontal scrubbers mainly rely on a single spray method for dust treatment. When the gas-liquid contact is insufficient, unstable purification efficiency is prone to occur.

Under some special working conditions, the equipment may have uneven air flow distribution, inability to separate hot and cold gases, and inconvenient maintenance of filter components. If the entire machine must be shut down when replacing the filter plate or inspecting internal components, production continuity will be affected.

2. Design goals of the horizontal PP scrubber

In order to improve the single spray treatment effect, the exhaust gas can be more fully purified in the tower by adding air flow distribution, water storage filtration, segmented spray and gas splitting structures.

When designing, attention should be paid to airflow uniformity, spray coverage, drainage smoothness, equipment inspection space and subsequent maintenance convenience.

3. Main structure of the tower body

The main body of the horizontal PP scrubber tower is a hollow tower body set horizontally. Supporting feet are provided at the bottom of the tower body to ensure stable installation of the equipment.

An air inlet pipe or suction pipe is provided on one side of the tower body, and an exhaust port is provided on the other side. According to the treatment requirements, a hollow diverter plate and multiple air guide tubes can be installed in the air inlet area to allow the exhaust gas to enter the tower evenly.

1. Tower body: Made of PP plate, with good acid and alkali resistance and corrosion resistance.

2. Supporting feet: support the tower body and ensure that the equipment remains level during installation.

3. Air inlet: connected to the waste gas pipeline to allow the gas to be treated to enter the tower body.

4. Exhaust port: transport the purified gas to the fan, subsequent equipment or discharge pipe.

4. Production of the spray system

A water injection pipe is installed on the upper part of the tower body, and an annular or transverse spray pipe is connected below the water injection pipe, and nozzles are evenly installed on the spray pipe.

The spray liquid is sprayed into fine droplets from the nozzle, allowing the exhaust gas to fully contact the liquid. The number of nozzles, spray direction and layout spacing should be determined based on the air volume, tower size and spray coverage.

1. The spray pipeline should be firmly installed and easy to disassemble and clean.

2. The nozzles should be arranged evenly to reduce spray blind areas.

3. For circulating fluids that are prone to scale or contain particulate matter, nozzles that are not easily clogged should be used.

4. The sprinkler system should be equipped with an inspection port to facilitate daily maintenance.

5. Water storage and water receiving structure

A water receiving tank or water storage tank is provided under the spray area to collect spray liquid. The water receiving tank is connected to the circulating water tank or drainage system through pipes, so that the absorbent liquid can be recycled or discharged centrally.

A partition can be installed under the sink and a leakage hole can be provided on the partition. The lower end of the leakage hole is connected to a drainage pipe, and a valve is installed on the drainage pipe to control drainage and clean up sediments.

6. Air guide and splitting structure

In order to improve the air flow distribution, a hollow plate can be set at the air inlet end, and multiple air guide tubes can be arranged on the hollow plate. The air guide pipes can be straight or evenly distributed, so that the exhaust gas can form a more stable flow field after entering the tower body.

The interior of the tower can also be equipped with partitions and adjustable rotating pieces. By changing the angle of the rotating pieces, the gas flow direction can be controlled to achieve switching or distribution between different air flow channels.

For gases with temperature differences, hot and cold air flows can be divided according to actual process requirements, but the specific structure should be designed based on the temperature, air volume and waste heat utilization plan.

7. Filtration and multi-stage purification design

A single spray has limited processing capacity for fine dust and complex exhaust gases, so a water storage filter area, packing layer, filter plate or mist removal layer can be added before and after the spray section.

1. Preliminary water storage filtration: Use water or liquid membrane to initially treat larger particles and some water-soluble pollutants.

2. Spray purification: further capture dust and absorb acid and alkaline gases.

3. Packing layer: Increase the gas-liquid contact area and improve mass transfer efficiency.

4. Demist layer: removes droplets entrained in the purified gas.

8. Precautions when manufacturing equipment

1. The thickness of the PP plate should be reasonably determined based on the tower size, negative pressure and structural strength.

2. The welding part should be continuous, flat and sealed to avoid air and liquid leakage.

3. Dead spots should be reduced inside the tower to prevent long-term accumulation of sludge and dust.

4. The spray pipe, filter plate and demister layer should be designed as detachable structures.

5. A sewage outlet should be provided at the bottom of the equipment to facilitate regular cleaning of sediments.

6. The size of the inlet and outlet flanges should match the on-site air duct.

7. Sufficient access openings and maintenance space should be reserved on the tower body.

9. Main effects brought by structural design

1. Through the combination of water storage area, air duct and spray system, the treatment effect of dust and water-soluble pollutants can be improved.

2. The problem of uneven air flow inside the tower can be improved through the air flow distribution structure.

3. Through partitions and adjustable flow guide components, the gas can be divided according to process needs.

4. The use of modular filter components facilitates later inspection, replacement and maintenance.

The specific structure of the horizontal PP scrubber should be designed according to the exhaust gas composition, temperature, concentration, treatment air volume and emission requirements. For high-temperature, flammable, explosive or poorly soluble organic waste gases, corresponding cooling, explosion-proof or subsequent purification equipment needs to be configured.