High-Flow Exhaust Tower Special Water Pump

Product Model	Anti-corrosion circulating pump series
Category	Waste Gas Treatment Equipment
Reference Price	Price on request

Hot Customizable for Working Conditions 10 Technical Parameters

Product Overview

The high-flow exhaust tower water pump is a circulating pump specifically designed for wet exhaust treatment equipment such as spray towers, scrubbing towers, and acid mist purification towers. It is responsible for pressurizing and transporting the absorption liquid (alkaline solution, acidic solution, or clean water) from the bottom sump tank to each layer of spray pipe within the tower. The liquid is atomized and sprayed through nozzles, coming into contact with the exhaust before falling back into the sump for recycling. The characteristics of exhaust tower circulation include high flow rate, relatively low head, and the Conveyor medium containing acid or alkali with the potential to carry small particles. Therefore, dedicated pumps commonly use corrosion-resistant plastic materials such as PP and PVDF, designed as corrosion-resistant centrifugal pumps, distinguishing them from conventional clean water pumps.

Exhaust tower circulating pumps are typically available in two forms: vertical sump pumps (submersible pumps) and horizontal corrosion-resistant pumps. Vertical sump pumps have their pump body directly installed on the top plate of the sump, with the impeller partially immersed in the liquid, while the motor is located above the liquid surface. They employ an axial seal-free structure, eliminating mechanical seal leakage issues and making them less prone to damage during short-term dry running. These pumps save floor space and are the most commonly used type for spray towers. Horizontal corrosion-resistant pumps are installed on the ground beside the sump, drawing water from the sump through suction pipes, equipped with mechanical seals, and offering convenient maintenance. Both types of pumps have all flow-through components made of acid/alkali-resistant materials, suitable for corrosive circulating liquid environments.

Xicheng Environmental Protection provides high-flow exhaust tower water pumps tailored to the treatment air volume of spray towers, the number of spray layers, the number of nozzles, and the required spray pressure to determine flow rate and head. The pump body material is selected based on the composition and temperature of the circulating liquid. These pumps can be supplied as complete sets with spray towers, along with Complementary valves, pipelines, and spare pumps, ensuring continuous and reliable operation of the spray circulation system.

Working Principle

Exhaust tower water pumps are centrifugal pumps. Their working principle involves the high-speed rotation of the impeller driving the liquid inside the pump. Under centrifugal force, the liquid is thrown from the center of the impeller to its outer edge, gaining pressure energy and kinetic energy. As it enters the volute, it slows down and increases in pressure before being discharged into the spray pipeline. A low-pressure area forms at the center of the impeller, and the liquid from the sump is continuously drawn into the impeller through the inlet pipe or the lower part of the pump body, achieving continuous liquid transport and circulation. The motor drives the impeller rotation through a long shaft (vertical) or coupling (horizontal).

In an exhaust tower system, the pump pressurizes the circulating liquid to the spray pipeline. The liquid forms fine droplets and is evenly sprayed across the entire tower cross-section through the nozzles, providing liquid film and washing liquid to the packing layer. After gas-liquid absorption, the liquid falls back to the bottom sump of the tower under gravity, and the pump then draws liquid from the sump, creating a closed-loop circulation. Vertical sump pumps, with their impeller submerged and axial seal eliminated, rely on the liquid itself for lubrication and cooling, eliminating issues of seal corrosion and leakage from acid or alkali. They also allow for brief dry running. The pump's flow rate and head characteristics must match the resistance of the nozzles and pipelines to ensure stable pressure and atomization effects at each spray layer. Insufficient flow rate can lead to dry zones in the packing and reduced purification efficiency.

Structural Components

The high-flow exhaust tower water pump consists of an motor, pump body, impeller, pump shaft, inlet and outlet, installation plate or base, and sealing structure. For vertical sump pumps, the upper part is a standard motor, with the motor housing fixed to the top plate of the sump. A long shaft extends downward into the sump, while the lower part consists of the pump body and impeller submerged below the liquid surface. The outlet pipe runs along the side of the pump to connect to the spray pipeline, employing an axial seal-free (no mechanical seal) structure.

The pump body, impeller, volute, and outlet pipe are made of corrosion-resistant plastics such as PP, PVDF, or FRPP through injection molding or forming, resistant to acid, alkali, and salt corrosion. The impeller is typically closed or semi-open centrifugal, with the semi-open design offering better resistance to impurities. A reliable isolation and protection is provided between the motor and the pump body to prevent corrosion from acidic gases and liquids. Horizontal pumps are equipped with a pump base, coupling, mechanical seal, and suction pipe, along with a bottom valve or water-priming device. The pump's inlet and outlet are connected to pipelines and valves via flanges or threads, with on-site installation of valves, flexible connectors, pressure gauges, and filters. Critical systems are equipped with one primary and one spare pump.

Specification Model Table

The following table compares the characteristics of vertical sump pumps and horizontal corrosion-resistant pumps for selection based on installation conditions.

Item	Vertical Sump Pump	Horizontal Corrosion-Resistant Pump
Installation	Submerged in sump top plate	Ground foundation
Axial Seal	No axial seal, no leakage	Mechanical seal
Dry Running	Allows brief dry running	Prohibits dry running without water
Maintenance	Requires lifting and removal	Easy ground maintenance

Product Features

The high-flow exhaust tower water pump is corrosion-resistant, acid/alkali-resistant, high-flow, and operates reliably, serving as a key Complementary for stable purification of spray towers. Its main features are as follows.

Flow-through components made of PP or PVDF, resistant to acid/alkali/salt corrosion
High flow rate, low head, matched with multi-layer nozzles of spray towers
Vertical axial seal-free structure, no leakage, allows brief dry running
Installed in sump, saves space, reliable suction without priming
Impeller designed for anti-blocking, suitable for small impurities in circulating liquid
Complements spray towers for stable spray pressure
Comprehensive specifications, can be paired with valves, pipelines, and spare pumps

Pump Type	Anti-corrosion Centrifugal Pump
Common Forms	Vertical Tank / Horizontal Tank
OverflowMaterial	PP / PVDF / FRPP
Transport Medium	Acid-Base Absorption Liquid Circulating Water
Flow Characteristics	High-traffic
Head characteristic	Low-to-Medium Head
Sealing Form	Vertical Shaftless Seal
Purpose	Spray Tower Circulating Spray
Configuration	Valves and pipelines are optional
Specifications and Features	Select based on spray volume

Application Industries

Absorption liquid circulation spraying in spray towers and Washing towers
Alkali liquid circulation conveying in acid mist purification towers
Circulation water pump matching for PP exhaust gas purification towers
Circulation water supply for horizontal spray towers and packing towers
Corrosion-resistant reagent circulation conveying in chemical plating workshops
Chemical addition and corrosion-resistant liquid conveying in wastewater treatment
Backup pump and replacement matching for exhaust gas treatment systems

Typical Process Locations

The vertical tank-mounted pump is installed on the top plate of the spray tower's circulation water tank. The pump body and impeller are immersed below the water level through openings in the top plate, while the motor is located above the top plate. The liquid outlet is connected via valves and pipelines to the main spray pipes on each layer of the tower. The horizontal pump is installed on a foundation beside the water tank, with the suction pipe drawing water from the bottom of the tank and the outlet connected to the spray pipes. A filter screen should be installed near the pump's suction inlet or inside the tank to prevent filler fragments and impurities from entering the pump body and nozzles. The outlet is equipped with valves, pressure gauges, and necessary soft connections. Before returning to the tank, the circulating liquid passes through the sedimentation area of the tank. Critical systems are equipped with two pumps (one in use and one on standby) with automatic switching.

During installation, the vertical pump must be ensured to be vertically aligned, with the immersion depth meeting requirements and a certain distance from the tank bottom and walls. The liquid discharge pipe must be independently supported to avoid transferring the weight of the pipeline to the pump. For horizontal pumps, ensure the suction pipe is airtight, with proper priming or reliable bottom valves. Before startup, check the water level and rotation of the tank. First confirm the submersible pump is immersed, then open the outlet valve before starting. During operation, monitor pressure, current, vibration, and noise. Horizontal pumps must not run dry or with blocked inlets. Daily checks should include verifying normal flow and pressure, checking for motor overheating, abnormal vibration, and leaks.

First, check if the water tank liquid level is too low, or if the suction filter or suction pipe is blocked by filler fragments and sludge, causing insufficient suction. Then, inspect if the pump rotation direction is correct, if the impeller is worn or jammed by debris, if the outlet valve and nozzle are blocked, and if the pump's flow rate and head selection is too small. The handling sequence is to replenish the liquid level, clean the filter and nozzle, verify the rotation direction, and disassemble to inspect the impeller and flow channel. If the weakness occurs after the tower height is increased or the number of spraying layers is added, it is often due to insufficient pump head, requiring replacement with a pump of higher head. Spraying pressure and flow rate directly affect the purification effect. Abnormalities should be addressed promptly, and the filler should not be kept in a state of insufficient spraying for a long time.

Spray Tower Accessories Prefer Vertical Tank-Immersion Pumps: They feature no shaft seal, resistance to acid and alkali corrosion and leakage, allow brief dry running, reliable submergence suction, and occupy no floor space, making them ideal for unattended continuous operation of exhaust towers. The advantage of horizontal corrosion-resistant pumps is the convenience of ground-level maintenance during repairs without lifting, suitable for applications where tank tops cannot be opened, high pump power is required, or ground-level maintenance is the local practice. Selection should consider tank structure, site conditions, medium temperature, and maintenance requirements. In cases with strong corrosion and concerns about seal leakage, vertical shaftless pumps are more reliable.

The circulating liquid in the exhaust tower contains acids, alkalis, and salts, which will corrode ordinary cast iron and stainless steel pumps. Specialized pumps with PP, PVDF, FRPP, or other corrosion-resistant material impellers must be selected. Generally, PP or FRPP is sufficient for acidic/alkaline and ambient temperature circulating liquids; for media with higher temperatures, strong oxidizing properties, or special solvents, PVDF or higher-grade materials should be selected. When selecting, the composition, concentration, and temperature of the circulating liquid should be provided to the manufacturer to verify material compatibility. Additionally, attention should be paid to the corrosion protection of the motor and metal frame to prevent corrosion from tower area gases. Using the wrong material or substituting with ordinary fresh water pumps will lead to issues such as impeller corrosion and pump body leakage in the short term.

Vertical Shaftless Seal-Channel Pumps rely on liquid transport for cooling and lubrication, allowing brief idling, but prolonged dry running without water will cause overheating and wear of plastic components and bearings inside the pump, which should be avoided. Horizontal Mechanical Seal Pumps are strictly prohibited from idling; water shortage during operation will cause the mechanical seal to experience short-term dry friction and burn out, leading to leaks. During operation, ensure the water level in the tank is higher than the pump suction inlet or the specified submersion depth. Install low-level alarm or interlock with the pump, and shut down the pump when the water level is too low. If suction vacuum, air ingress, or abnormal sounds are detected, immediately check the water level and suction piping, and do not allow the pump to continue running in a water-deficient state.

The flue gas treatment system must operate continuously; if the spray pump stops, the tower will lose absorbent, immediately rendering purification ineffective, and the flue gas may exceed emission standards. Therefore, in cases requiring strict environmental protection or continuous production, it is recommended to configure two pumps (one primary and one backup) and set up fault switching or regular pump rotation to ensure uninterrupted spraying. For intermittent production systems with shutdown and maintenance conditions, only one pump can be equipped with spare parts. Whether to have a backup also depends on emission regulations and production shutdown losses; important emission outlets are recommended to have backups. Backup pump piping must be properly installed to ensure rapid switching in case of a failure.

Daily inspections check pressure, current, liquid level, vibration, noise, and temperature, listen for friction or abnormal sounds, and inspect pipelines and valves for leaks; regularly clean fill fragments, crystals, and sludge from water tanks and suction filters, check if nozzle sprinkling is uniform; regularly inspect impeller wear and corrosion, as wear reduces flow and pressure, and replace promptly; for vertical pumps, check motor base fixation and long shaft alignment; for horizontal pumps, check mechanical seal leaks, bearing lubrication, and coupling alignment. Long-term shutdowns should flush corrosion from pumps and pipelines and drain them, and take anti-freeze measures in winter. Establish inspection and spare part replacement records to reduce unexpected failures.

Previous Product Drawer-type activated carbon adsorption ... Next Product Square duct muffler