PP Fire Retardant Spray Tower

Product Model	PP-T Series (φ800–φ3000)
Category	Waste Gas Treatment Equipment
Reference Price	Price on request

Hot Customizable for Working Conditions 13 Technical Parameters

Product Overview

The PP Flame-Retardant Spray Tower, also known as the PP Washing Tower or Acid Mist Purification Tower, is a wet scrubbing device designed for pre-treatment of industrial acid and alkali exhaust gases, acid mist, and organic exhaust gases. The exhaust gas is introduced into the tower through ductwork, where it comes into full contact with the packing layer and spray absorption liquid for absorption and neutralization. Pollutants are captured by the liquid phase, and the gas is dehumidified by the demisting section before being discharged into the atmosphere by the fan. The absorption liquid is pumped from the bottom of the tower for circulation and spray, ensuring the purified gas meets emission standards. The equipment is fabricated from corrosion-resistant, acid/alkali-resistant, and UV-resistant PP flame-retardant materials, featuring a rational structure, aesthetically pleasing appearance, and robust durability. It can be customized to match the absorption liquid and tower type based on the composition of the exhaust gas and on-site conditions, making it a widely used wet scrubbing device in industrial exhaust gas treatment.

Working Principle

The tower primarily consists of a spray system and a packing system. As the exhaust gas passes through the packing section, it comes into full contact with the flowing washing liquid on the packing surface, neutralizing acidic or alkaline contaminants in the gas. Subsequently, the clean gas is separated from the contaminated liquid. The purified gas is dehumidified and demisted by the demisting plates before being discharged by the fan. The absorption liquid falls to the bottom of the tower, is pumped for pressure enhancement, and is sprayed downward from the top of the tower for recirculation and reuse. For sticky exhaust gases like paint mist or conditions with high dust content, a swirl tower can be selected, utilizing the inertia collision of dust particles with liquid droplets, centrifugal separation, and liquid film adhesion to remove dust.

Structural Components

The equipment, from bottom to top, mainly consists of the inlet duct, storage tank, circulation pump, packing section, grating plate, spray section, inspection window, demisting section, reducer, and outlet duct. The packing section uses PP multi-faceted hollow spheres or Raschig rings as packing materials to increase gas-liquid contact area. The spray section employs multi-layer nozzles for uniform and Dead ends -free spraying. The demisting section is used for dehumidification and demisting, reducing liquid carryover to protect the downstream fan. The inspection window is made of transparent flame-retardant material for easy observation and maintenance. Standard equipment includes spray pipes, ball valves, flow meters, differential pressure gauges, integrated grating, tank covers, water replenishment and drainage kits, and high-flow pumps. All components are designed in standardized modular form for easy on-site installation and maintenance. The storage tank is integrated with the tower body to minimize leakage risks.

Tower Type Classification

Based on structure, the towers are classified into four types: vertical spray towers, horizontal towers, swirl towers, and spiral towers. Vertical cylindrical towers have a small footprint and low cost, making them the preferred choice for conventional applications. Horizontal square towers have a relatively complex manufacturing process and higher cost but lower height, suitable for installations with height constraints. Swirl towers use multi-layer swirl vanes for bidirectional spraying in both forward and reverse directions, ideal for sticky exhaust gases like paint mist and dusty conditions. Spiral towers are formed through integral winding, offering high mechanical strength, excellent overall integrity, corrosion resistance, and anti-leakage properties. Wall thickness can be customized between eight to seventy millimeters, making them suitable for applications requiring high strength and durability.

Specification and Model Table

Specification/Model	Tank Body (mm)	Bottom Plate (mm)	Spray Section	Packing Section Height (mm)	Demisting Section	Demisting Section Height (mm)	Inspection Window Size	Outlet Duct
φ800	8	8	2/1	400	1	600	φ400	φ315
φ1000	8	10	2/1	400	1	600	φ400	φ355
φ1200	8	10	2/1	400	1	600	φ400	φ400
φ1500	8	10	2/1	500	1	600	φ500	φ500
φ1800	10	10	2/1	500	1	600	φ500	φ600
φ2000	10	12	2/1	500	1	600	φ500	φ650
φ2200	10	12	2/1	500	1	600	φ500	φ700
φ2500	12	12	2/1	500	1	600	φ500	φ800
φ2800	12	15	2/1	500	1	600	φ500	φ900
φ3000	12	15	2/1	500	1	600	φ500	φ1000

Standard equipment includes spray pipes, ball valves, flow meters, differential pressure gauges, integrated grating, tank covers, new-type water replenishment and drainage kits, and high-flow pumps; overall dimensions and structure can be customized based on customer site conditions and treatment airflow requirements.

Product Features

Uses PP/PPs flame-retardant materials, resistant to acid/alkali, UV, and flame-retardant, with long service life
Specialized packing combined with multi-layer spraying for full gas-liquid contact and effective absorption/neutralization
Specialized demisting section reduces liquid carryover at the outlet, effectively protecting downstream fans
Recirculation of absorption liquid reduces water and chemical consumption, lowering operating costs
Comprehensive standard specifications available, with non-standard customization possible based on site conditions
Can be supplied as a complete set with activated carbon adsorption boxes, PP fans, ductwork, and dampers

主体材质	PP/PPs 阻燃聚丙烯
塔型分类	立式 / 卧式 / 旋流 / 缠绕
板材特性	防腐、耐酸碱、抗 UV、阻燃
标准规格范围	φ800–φ3000
桶身壁厚	8–12mm
底板厚度	8–15mm
缠绕塔壁厚定制范围	8–70mm
喷淋层形式	2/1 多层喷淋
视窗规格	φ315/φ400/φ500
出风口规格	φ315–φ1000
填料类型	PP 多面空心球 / 拉西环
处理对象	酸碱废气、酸雾、有机废气
安装方式	室内外均可

Application Industries

Absorption and purification of acidic and alkaline exhaust gases such as sulfuric acid mist, hydrochloric acid mist, and alkali mist in chemical and pharmaceutical production processes
Control of acid mist and chromic acid mist generated in acid washing lines and electroplating tanks in electroplating and surface treatment industries
Acidic and alkaline exhaust air washing and purification in laboratories and etching processes in the electronics and semiconductor industries
Pre-treatment of paint mist and dust in the coating and spray painting industry (recommended to use cyclone tower structure)
Pre-cooling, dedusting, and demisting before activated carbon and catalytic combustion equipment in organic exhaust gas treatment
Centralized purification of acidic and alkaline exhaust gases in fume hoods and exhaust systems of laboratories and testing institutions
Exhaust gas treatment in production processes of industries such as metallurgy, textiles, rubber, plastics, automotive, and cement

Typical Process Locations

The typical exhaust gas treatment process involves collecting exhaust gas through hoods or ducts, which first enters a PP flame-retardant spray tower for acidic and alkaline washing, cooling, and dedusting, and then enters deep treatment equipment such as activated carbon adsorption boxes based on pollutant composition. Subsequently, it is discharged through a PP corrosion-resistant fan via an exhaust stack to meet emission standards. For high-concentration or insoluble exhaust gases, multi-stage spray Series or a combination with other purification equipment can be adopted. The equipment can be installed vertically or horizontally based on on-site space and flexibly connected with upstream and downstream equipment through PP flame-retardant ducts. Xicheng Environmental Protection can provide complete sets of equipment such as spray towers, activated carbon adsorption boxes, PP fans, PP flame-retardant ducts, and dampers, as well as one-stop services including solution design, equipment manufacturing, and installation and commissioning.

The PP Flame Retardant Spray Tower is a wet-type exhaust gas purification equipment. Exhaust gas is introduced into the tower through ducts and comes into full contact with the absorbing liquid sprayed by the spray system as it passes through the packing layer. The acidic or alkaline pollutants in the exhaust gas are neutralized by the liquid phase. Subsequently, the gas is dehumidified and defogged by the demisting layer before being discharged into the atmosphere by the fan. The absorbing liquid falls to the bottom of the tower, where it is boosted by a pump and recirculated to the top for continuous spraying, thereby achieving the purpose of exhaust gas purification. The entire process ensures thorough gas-liquid contact, allows the absorbing liquid to be recycled, and has low operating costs. The equipment features a simple structure, stable operation, and convenient maintenance, making it a widely used purification device in industrial acid and alkaline exhaust gas treatment.

Mainly handles various acid, alkali, and acid mist exhaust gases, such as sulfuric acid mist, hydrochloric acid mist, nitric acid mist, alkali mist, and chromic acid mist. It can also be used for pre-treatment cooling, dedusting, and demisting of organic exhaust gas before entering activated carbon or catalytic combustion equipment. For viscous exhaust gas with more paint mist and dust, it is recommended to choose a swirl tower structure, utilizing the centrifugal separation generated by swirl vanes and the adhesive effect of liquid film to remove particulate matter. The absorption liquid needs to be matched according to the pollutant composition, such as using alkaline solution to absorb acidic gases and acidic solution to absorb alkaline gases. For high-concentration exhaust gas, multi-stage series treatment can be adopted to ensure compliance at the outlet.

Both models exhibit corrosion resistance. The PP fireproof spray tower is lightweight, easy to process and form, features excellent welding and sealing performance, offers high cost-performance, and has a wide acid and alkali resistance range, making it the mainstream choice for acidic and alkaline exhaust gas treatment currently. The fiberglass spray tower has better temperature resistance and structural rigidity, making it suitable for applications with higher exhaust gas temperatures or requirements for large diameters and high mechanical strength. When selecting, factors such as exhaust gas composition, temperature, treatment air volume, on-site installation space, and budget should be comprehensively considered. The manufacturer can provide tailored solutions based on specific conditions. Both materials have their applicable scenarios, with no absolute superiority or inferiority; the key is to match the actual conditions.

The selection primarily requires the following parameters: First, the nature of the exhaust gas, including pollutant composition, concentration, and acid-base type; second, the treatment air volume, measured in cubic meters per hour; third, the exhaust gas temperature and humidity; fourth, the on-site installation space, including height and footprint limitations; fifth, the required purification efficiency and applicable emission standards; sixth, material preferences. Providing these parameters allows for matching the tower diameter, tower type, and circulating water pump. Standard tower diameters cover φ800 to φ3000, with non-standard designs available for special conditions. If flammable and explosive exhaust gas is involved, the gas composition and explosion-proof requirements must also be specified.

The vertical spray tower features a circular structure, occupying less space and having lower costs, with longer gas-liquid contact time, making it the preferred choice for conventional acid and alkali exhaust gas treatment. The horizontal spray tower is mostly square in structure, with relatively complex manufacturing and higher costs, but has a lower overall height, making it suitable for installation in places with height restrictions such as floors or basements. Both operate on the same purification principle, completing purification through contact between the packing layer and the spray absorption liquid. The specific choice depends on on-site installation conditions and treatment airflow. Under the same treatment airflow, the overall height of the vertical tower is typically higher than that of the horizontal tower.

The absorbent is determined based on the composition of pollutants in the exhaust gas. For treating acidic exhaust gas, alkaline absorbents such as sodium hydroxide solution are typically used; for treating alkaline exhaust gas, acidic absorbents such as dilute sulfuric acid solution are used; for treating water-soluble organic exhaust gas, water or corresponding solvents can be used. The concentration and circulation rate of the absorbent need to be designed according to the exhaust gas concentration and treatment air volume. During operation, the pH and concentration of the absorbent should be monitored regularly, and chemicals should be replenished or circulating liquid replaced in time to ensure stable purification effects. The absorbent should be avoided from being discharged arbitrarily, and it needs to be discharged or recycled after being treated in accordance with environmental protection requirements.

Regular spray towers rely on a packing layer to increase gas-liquid contact area, suitable for conventional acid-base waste gases and acid mists; the cyclone tower features multiple cyclone blades internally. The first layer sprays counterclockwise, the second layer sprays clockwise, with the two-phase gas colliding in opposite directions, causing dust or paint mist sludge to flow into the bottom of the tower through inertia collision, centrifugal separation, and liquid film adhesion. The third layer is the mist separator with a size transition. The cyclone tower is more suitable for sticky paint mist waste gases and conditions with higher dust content, while the regular packing tower is better for soluble acid-base gases. The cyclone tower has relatively higher resistance, requiring a fan with higher pressure matching during selection.

The tower body of the winding tower adopts a one-piece winding forming process, resulting in higher mechanical strength, better overall integrity, superior corrosion resistance, and anti-leakage performance compared to conventional welded towers. The tower body is aesthetically pleasing and exhibits excellent airtightness. The thickness of the winding tower body can be customized based on actual requirements, ranging from 8 to 70 millimeters, offering enhanced wind resistance performance and longer service life, making it suitable for a wider range of applications. For scenarios involving high airflow and stringent requirements for tower strength and service life, the winding tower is a more reliable choice. Standard towers can also be equipped with spray, packing, and demisting systems. The production cycle of the winding tower is slightly longer than that of conventional welded towers, making it ideal for projects with high quality requirements.

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