Flame Retardant Horizontal Spray Tower

Product Model	Horizontal Spray Washing Tower Series
Category	Waste Gas Treatment Equipment
Reference Price	Price on request

Hot Customizable for Working Conditions 10 Technical Parameters

Product Overview

The PPs flame-retardant horizontal spray tower is a cross-flow (horizontal arrangement) spray washing and purification equipment. The exhaust gas enters the tower body horizontally and sequentially passes through the horizontally arranged spray section and packing section, coming into countercurrent or cross-current contact with the absorption liquid before being discharged from the other end. Compared to conventional vertical spray towers, the main features of horizontal towers are their low overall height, relatively larger footprint, and larger tower bottom liquid surface contact area. They can be installed in indoor spaces, equipment mezzanines, and locations with limited ceiling height. The horizontal arrangement of exhaust gas inlets and outlets facilitates easy connection with workshop horizontal ducts.

In plating, chemical, and semiconductor factories, exhaust gas treatment equipment is sometimes unable to be installed outdoors or on rooftops. Indoor installation is limited by ceiling height and hoisting conditions, making it difficult to place vertical high towers. The horizontal spray tower expands the purification process horizontally, ensuring sufficient gas-liquid contact time through multi-stage spraying and packing. The tower body can be directly mounted next to equipment or on a support, with inlets and outlets connected directly to horizontal ducts, reducing elbows and vertical pipes. The tower body is constructed from PPs flame-retardant panels, which are acid/alkali resistant and self-extinguishing, meeting indoor equipment's corrosion and fire protection requirements.

Xicheng Environmental can design PPs flame-retardant horizontal spray towers based on exhaust gas types, treatment airflow, site ceiling height, and planar layout. Multiple-stage spray pipes, packing layers, and demisting sections can be arranged inside the tower, equipped with circulation pumps, dosing devices, and inspection doors. PPs or PP panels are optional. Tower length, cross-section, and inlet/outlet orientations are customized to site conditions, making them suitable for indoor corrosion-resistant exhaust gas treatment and projects where vertical tower installation is constrained.

Working Principle

The horizontal spray tower still employs liquid absorption to purify exhaust gas. The exhaust gas enters horizontally from one end of the tower and flows horizontally through the spray zone. Nozzles spray absorption liquid, forming droplets and films that flow downward or in countercurrent, allowing acidic/alkaline pollutants in the exhaust gas to be absorbed and neutralized by the liquid. The horizontal packing layer inside the tower increases gas-liquid contact area, ensuring thorough absorption. The purified gas continues to flow horizontally, passes through the demisting section to remove entrained liquid droplets, and is discharged from the other end by a fan. The liquid absorbing pollutants flows into the bottom water tank for recycling.

The gas-liquid contact feature of the horizontal arrangement is horizontal airflow and downward liquid flow, primarily cross-current contact. The large liquid surface at the bottom of the tower also provides some washing effect on exhaust gas passing near the surface. To compensate for the difference in mass transfer driving force between cross-current and countercurrent, horizontal towers typically feature multiple-stage spraying and packing sections, extending the horizontal flow path and contact time. The PPs tower body and packing are acid/alkali resistant and self-extinguishing. The tower's internal airflow velocity is designed to be low to prevent liquid entrainment by horizontal high-speed airflow. The demisting section ensures the outlet gas is free of water droplets, protecting downstream fans and ducts.

Structural Components

The horizontal spray tower consists of a horizontal tower body, inlet, spray section, packing section, demisting section, circulation water tank, spray piping, and inspection structure. The tower body is a horizontal cylindrical or box-shaped structure welded from PPs panels, divided into sections along its length. One end is horizontally inhaled, and the other is horizontally exhausted. The bottom is a circulation water tank, with reinforcing rings and supports on the exterior.

Inside the tower, one or more layers of spray pipes and nozzles are arranged according to the process. Packing layers (e.g., multi-faceted spheres, Raschig rings) are placed above or between the spray pipes, supported by grates. The outlet end features baffle plates or mesh demisting sections. The bottom water tank is equipped with a circulation liquid outlet, drain, overflow, make-up water inlet, and dosing inlet. The circulation pump delivers the absorption liquid to the spray pipes. Multiple inspection doors are installed along the side of the tower for easy access to the interior for maintenance and packing replacement. Inlets and outlets are horizontal flange connections for horizontal ducts, with the tower equipped with level indicators, manholes, and ladder platforms. PPs panels and welding rods are flame-retardant and compatible, meeting indoor fire protection requirements.

Specification Model Table

The following table compares the layout characteristics of horizontal and vertical spray towers. Dimensions are based on airflow and site design.

Item	Horizontal Spray Tower	Vertical Spray Tower
Arrangement Direction	Horizontal	Vertical
Height	Low, suitable for indoor installation	Higher
Footprint	Larger horizontal footprint	Smaller footprint
Airflow	Horizontal inlets and outlets, cross-current	Bottom inlet, top outlet, countercurrent

Product Features

The PPs flame-retardant horizontal spray tower is low in height, easy to connect, and corrosion-resistant and flame-retardant, making it an ideal washing and purification equipment for indoor and low-ceiling spaces. Its main features are as follows.

Low overall height in horizontal arrangement, suitable for indoor and mezzanine installation
Horizontal exhaust gas inlets and outlets, easy connection with horizontal ducts with fewer elbows
Large contact area at the bottom, multi-stage spraying ensure purification efficiency
PPs flame-retardant panels, acid/alkali resistant and self-extinguishing
Tower length and cross-section customizable to site dimensions
Multiple side inspection doors, convenient for packing replacement and internal maintenance
Can be equipped with circulation pumps, dosing, and demisting, available as a complete package

Material of tower body	PPs Flame Retardant Panels
Layout configuration	卧式横向
Flow Direction	Lateral horizontal entry and exit
Contact Method	Spray Cross-Flow Packing
Number of Spray Stages	Multi-level Customizable
Flame Retardancy	Self-extinguishing
Corrosion Resistance Performance	Acid-alkali-resistant salt
Applicable scenarios	Indoor ceiling height limited
Specifications and Features	Dimension Customization
Complementary	Pump chemical dosing anti-fogging system

Application Industries

Acid-alkali fume washing and purification for indoor plant layout
Horizontal fume treatment for equipment mezzanines with limited ceiling height
Horizontal scrubbing towers installed near electroplating production lines
Low-height fume treatment equipment for basements and equipment floors
Purification scenarios requiring direct linear connection with horizontal ducts
Corrosion-resistant exhaust ventilation and washing equipment for semiconductor plant interiors
Transformation projects where vertical towers cannot be installed or placed

Typical Process Locations

The horizontal spray scrubbing tower is installed near equipment in workshops, on equipment floors, or in roof-constrained areas. The tower is horizontally mounted on a concrete foundation or steel support. Fumes enter the tower from one end via horizontal ducts and are exhausted from the other end by a fan into an exhaust stack, or directly connected to an existing horizontal exhaust system. Space is left around the tower for maintenance door access and media replacement channels. The circulation water tank and pump are located nearby, while the dosing unit is placed beside the tower for convenient medication preparation and replenishment.

During installation, the tower is horizontally positioned with evenly distributed support loads. Flanges and flexible connections are used between the tower and ducts to prevent duct weight from pressing on the tower wall. Valves and flexible connections are installed at the inlet and outlet of the circulation pump, and the spray pipes are centered and fixed inside the tower. Before operation, inspections are conducted on nozzle atomization and coverage, uniform media installation, and proper demisting section placement. Water tank filling and circulation tests are performed, along with checks for weld and flange leaks in the tower body. During operation, horizontal flow velocity inside the tower is controlled to prevent liquid carryover, and regular inspections are carried out for media blockage, nozzle wear, and water tank quality.

Primarily determined by installation space and connection conditions. The equipment can only be placed indoors, in basements, or mezzanines when the ceiling height is insufficient for installing vertical towers, or when overhead craning is not feasible on-site. In such cases, a horizontal tower is selected, trading height for planar length. When the main exhaust duct is horizontally laid, it is desirable for the equipment's inlet and outlet to connect directly with the ductwork, reducing the need for vertical pipes and elbows, making horizontal tower connections more convenient. If outdoor space and height are not restricted, vertical towers offer higher counter-current mass transfer efficiency and occupy less area, typically being more economical. Both types operate on the same purification principle, with the choice primarily based on on-site layout conditions.

The horizontal tower primarily features cross-flow contact. Its single-stage mass transfer driving force is generally inferior to that of vertical counter-current towers, but through multiple-stage spraying, multi-section packing, lower internal tower velocity, and sufficient gas-liquid contact time, horizontal towers can still achieve the designed purification efficiency. Horizontally arranged washing equipment is well-established in engineering applications. Design considerations should determine the number of spraying stages, packing length, and liquid-to-gas ratio based on exhaust gas concentration and efficiency requirements, rather than simply scaling down from vertical towers. With proper design and maintenance, horizontal towers can reliably meet emission standards for low-concentration, high-volume acid and alkali exhaust gas treatment in indoor environments.

Horizontal airflow in Horizontal Tower causes liquid droplets to fall perpendicular to the airflow due to gravity. If the tower's air velocity is too high and the spray rate is excessive, liquid carryover at the outlet is more likely. Design-wise, controlling the horizontal air velocity below the empty tower velocity of the vertical tower, providing sufficient gas-liquid separation space between the spraying section and the outlet, and installing baffle plates or filler demisting sections at the gas outlet can effectively dehydrate. During operation, if liquid carryover is detected at the outlet, check whether the air volume exceeds the design value, whether the demister is blocked or damaged, and whether the spray is excessive. Clean the demisting section promptly and adjust the operating parameters back to the design range.

Common practice involves using the bottom section of the tower as a circulating water tank (integrated), where the tower bottom space stores circulating liquid and receives reflux, featuring compact structure and short piping; large horizontal towers can also have the tank independently placed below or beside the tower body for easier increase in liquid storage capacity and maintenance. Integrated tanks must ensure effective volume meets circulating pump flow rate and retention time, equipped with level, overflow, drain, and chemical addition interfaces. Whether to use integrated or separate design depends on equipment size, on-site layout, and circulating flow rate, which should be confirmed with the manufacturer during ordering.

Indoor exhaust gas treatment equipment should use PPs flame-retardant panels and be equipped with flame-retardant welding electrodes, with flame-retardant performance of the materials meeting building fire protection requirements. Equipment layout must comply with fire separation distances, fire lanes, and equipment room specifications. The electrical components of the Matching Fans and pumps must meet protection requirements. Fire dampers and seals must be installed at the tower and duct penetrations through fire compartments according to fire design. While the wet operation of spray towers has a low fire risk, the PPs materials and chemicals used during maintenance still require management. The equipment room should be equipped with drainage, ventilation, and flushing facilities. Flame retardancy of the equipment is only one aspect of fire safety. The tower area must also be equipped with fire dampers, compartment seals, and fire extinguishing facilities in accordance with building fire protection requirements. The overall fire protection design and construction must be completed by professional units.

The height of the horizontal tower is low, and multiple maintenance doors can be installed along its side length. Personnel can enter the tower to inspect spray pipes, replace packing, and clean the water tank more conveniently compared to high towers, which is one of the advantages of the horizontal structure. However, when the packing section and number of spray stages inside the tower are numerous, the quantity of internal components is significant, and the positions of maintenance doors must correspond to each functional section, with sufficient space left outside the tower for extracting packing and operating. The daily maintenance content is the same as that of vertical towers: inspecting nozzle blockage and wear, packing scaling, demister fouling, pump and chemical dosing system, water tank drainage, and maintaining the normal pH and liquid level of the circulating liquid.

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