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Ejector Venturi Gas Scrubbers

The use of wet scrubbers for control of air pollution has gained wide acceptance throughout industry. And for good reason. The ejector-venturi wet scrubber provides a number of advantages over many of the conventional single-purpose devices available. Particulate collectors such as cyclones and electrostatic precipitators cannot efficiently absorb gases or remove odors. Fabric filters, by design, cannot cope with gas streams having a high moisture content and are often affected by highly corrosive gases. Catalytic incinerators can be quickly poisoned by certain organic wastes.

On the other hand, ejector-venturi gas scrubbers are very effective at removing noxious gases, particulates, odors, fumes and dusts from gas streams. Particulate contaminants are removed through impaction by the high velocity spray of the scrubbing liquid. Gases and odors are eliminated through adsorption and/or chemical reaction between the gases and scrub­bing liquid. When properly matched to the application, these scrubbers, by their nature, are better able to cope with the high temperatures and corrosive conditions often encountered.

We offer over sixty years of experience in the control of commercial and industrial air pollution using wet scrubber technology. The ejector-venturi gas scrubbers describ­ed on the following pages have been engineered to operate effectively in a variety of applications. Using the same basic design, these standard scrubbers can be sized to meet volume requirements from a few CFM to thousands of CFM. This broad applicability permits us to stock these scrubbers in a wide range of sizes and materials. A stock ejector­venturi scrubber can often be the most economical and efficient solution to a pollution control problem.

EST has full scale tested the ECS 3000 for a 2000 pound chlorine release at a rate of 495 pounds per minute with a full 3000 cfm scrubber exhaust rate. The chlorine concentration at the exit of the system did not exceed 0.3 ppm at any time during the test.

The flow of liquid and gas is both co-current and counter-current with a liquid rate to each stage matched to absorption performance. This precludes the possibility of caustic starvation. The system has the capability to handle the worst case release rate of liquid chlorine based on total vaporization of the chlorine.

EST designs the ECS 250 to neutralize a 150-pound chlorine cylinder at a continuous leak rate of up to 20 pounds per minute. The ECS 3000 and 5000 are designed to neutralize a one ton portable tank with a leak rate of up to 437 pounds per minute throughout the leak event. An ECS 5000 system is normally considered only when the gas capacity needs to be split between two or more rooms or if a single room volume exceeds 50,000 cubic feet. See Picture Of A Packed Tower

TYPE SW EJECTOR-DRIVEN EMERGENCY

The SideWinder (SW) is a low profile version of the proven ECS Ejector-Venturi, Packed Tower Emergency Chlorine Scrubbers. To reduce height, the venturi is laid on its side and the packed tower is divided into three shorter towers. The towers and venturi are mounted on a rectangular caustic storage tank, thus reducing the total height of the SW to about half that of the ECS. The caustic required for neutralization of the chlorine is contained within the lower section of the tank. A vertical sealless recirculation pump supplies caustic solution to the ejector-venturi scrubber and packed towers, System configurations include either one or two pumps to provide for redundancy of moving parts. Performance of the system is essentially identical to that of the ECS.

Advantages of the system include a low profile, co-current and counter-current flow design. The liquid rate to each stage is matched to the absorption performance, so there is no possibility of caustic starvation. Like the ECS, the SideWinder has the capability to handle the worst case release rate of liquid chlorine based on total vaporization of the chlorine while lowering the outlet chlorine concentration to below the level required by the prevailing fire codes.

The SW 250 is designed to neutralize a 150-pound chlorine cylinder at a leak rate of up to 20 pounds per minute throughout the leak event. The SW 3000 is designed to neutralize a one ton chlorine portable tank at a leak rate of up to 437 pounds per minute throughout the leak event. Dimensional Details  

TYPE MVP MULTI VENTURI PACKLESS   

At only 8’ tall, the fan-driven Multi Venturi Packless (MVP) scrubber is EST’s lowest profile emergency chlorine scrubber. The fan-driven MVP 3000 system consists of six venturis in series with a downstream fan which keeps the entire scrubber system capacity of about 2/3 of the rated capacity, or 2000 cfm for a 3000 cfm system.

The MVP is a low total horsepower system with a low liquid caustic pressure. Liquid and gas flow is co-current with a liquid rate to each stage matched to absorption performance, so there is no possibility of caustic starvation.

The caustic solution is supplied to each of the six-venturi stages by a vertical sealless recirculation pump. The system is available with either one or two pumps.

Advantages of the system include the lowest profile system available from EST with the capability to handle the worst case release rate of liquid chlorine based on total vaporization of the chlorine. The chlorine concentration at the exit of the system is reduced to a level below that required by the prevailing fire codes. Since there is no packing in the system, less surface area is available for carbonate buildup during down periods. Therefore, a longer caustic solution service life is expected. The MVP 3000 and 5000 are designed to neutralize a one ton chlorine portable tank at a leak rate of up to 437 pounds per minute throughout the leak event. Dimensional Details

TYPE ESW EJECTORLESS  

The Ejectorless SideWinder (ESW) is a low profile three-packed tower system with a downstream fan that keeps the entire scrubber system under a negative pressure. The ESW has a low caustic liquid pressure, and it is the lowest horsepower system available from EST. Co-current and counter-current flow are used with a liquid rate to each stage matched to absorption performance. This eliminates the possibility of caustic starvation. The system is capable of handling the worst case release rate of liquid chlorine based on total vaporization of the chlorine while lowering the outlet chlorine concentration to below the level required by the prevailing fire codes. A total combined motor horsepower of 15HP for the pump and fan is all that is required for the ESW 3000. One or two pump designs are available.

EST designs the ESW 3000 and 5000 are designed to neutralize a one ton chlorine portable tank at a fusible plug leak rate of up to 437 pounds per minute throughout the leak event. Dimensional Details