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The difference between wet and dry industrial scrubbers

Views: 22     Author: XICHENG EP LTD     Publish Time: 2021-08-17      Origin: XICHENG EP LTD

Industrial scrubbers are equipment that can control pollution by purifying the exhaust gas stream, which means that almost no harmful gases or particles will leave the building and enter the environment. In addition to removing toxic substances, industrial scrubbers can also clean the atmosphere and eliminate nearby smoke. You can choose between two basic types of industrial scrubbers, including wet scrubbers and dry scrubbers.

Wet and dry industrial scrubbers

If you want to buy a suitable industrial scrubber for a business or factory, it is important to understand these differences. The following content provides guidance on the various differences between wet and dry industrial scrubbers and how to use these scrubbers in industrial applications.

Wet industrial scrubber

Wet industrial scrubbers can remove pollutants from flue gas and similar gas streams by spraying liquid onto the gas and removing pollutants before the gas is sent to the environment. Liquids can absorb or dissolve contaminants. When trying to remove particles and dust, the only liquid that needs to be used in a wet industrial scrubber is water. On the other hand, if you want to remove pollutants from the air (such as acid gases), you can add other chemicals to the solution. Remember, before the gas is discharged into the environment, a large amount of water vapor is added to the gas, which is why a wet industrial scrubber causes white smoke to be released from the discharge port.

Grey packed bed scrubber

Wet industrial scrubbers can be used in any industrial application or process that produces gas. For example, these scrubbers are often used in manufacturing plants that directly process natural gas (such as propane). These scrubbers can remove all pollutants in the airflow before it enters the environment, which can help your facility avoid serious damage to the environment. Wet industrial scrubbers can be used at almost all temperatures, which makes them beneficial for most industrial applications. When using a wet scrubber, you will find that the system is very effective and can remove more than 99% of the particulate matter in the air. If you are considering choosing a wet scrubber for your company, you must first be aware of many advantages and disadvantages.

exhaust gas scrubber system

Advantages of wet industrial scrubber

They can effectively prevent most pollutants from directly entering the air through the exhaust gas. These scrubbers usually do not require much space. Wet scrubbers can remove corrosive gases. Almost all fine particles should be removed from the gas. Harmful gases can be combined with particles. Collection, can properly handle high humidity and high temperature airflow, airflow with explosive or flammable materials can be easily handled with a wet scrubber, some dry powder that may accumulate in the airflow is flammable, this is not a problem when using a wet scrubber. The cost is relatively low.

Disadvantages of wet industrial scrubber

The collected product is wet, which may cause water treatment problems, maintenance costs may be high, you will need to ensure that the collected material does not freeze, if the temperature of the outlet gas is lower, the dispersion of the exhaust plume will be greatly reduced, Unless you buy a portable system, the horsepower requirements and pressure drop requirements are relatively high, which may not meet your needs, solids may accumulate around the wet and dry interface, which may cause maintenance problems, and the accumulation of water will make the system very heavy.

How to use wet industrial scrubber?

The wet scrubber consists of a device that can remove most of the pollutants in the exhaust gas with the help of scrubbing liquid. The waste gas is directly fed in through the liquid in the scrubber and sprayed into the gas through a standard atomization process. Since pollutants and pollutants are heavier than pure gas, the gas will eventually flow through the liquid, while the pollutants will remain behind. At this point, the gas is discharged into the outside air.

Due to the chemical composition of the liquid, contaminants will adhere to the spray solution. Another technique that can be used with wet industrial scrubbers involves forcing exhaust gas to bubble through a large pool of scrubbing liquid. When this happens, dirt will remain in the washing liquid. Due to the similarity of these designs, the structure of most wet industrial scrubbers is the same. The fan system will be combined with the basic air duct system to pass air through the chamber and exhaust to the exhaust. It also includes a collection area for washing liquid and any contaminants that have been captured. Due to the content of this liquid, you will need to dispose of the waste through a special method.

Dry industrial scrubber

The dry scrubbing system is used in most modern factories, and its remarkable feature is that it can remove pollutants and pollutants in the exhaust gas without producing wet sludge. Because of the way these systems work, they usually do not have wastewater treatment or treatment requirements. When dry scrubbers purify gas with dry matter, these systems work almost the same as wet scrubbers. The equipment connected to the scrubber will directly spray a variety of dry reagents into the air stream, so that any harmful pollutants can be removed or the pollutants can be completely converted into another substance.

Activated carbon adsorption equipment

Before the exhaust gas stream leaves the scrubber chamber, heavier pollutants will fall off and be trapped in the particle screen. These scrubbers are mainly used to remove acidic substances, such as hydrochloric acid, from various combustion sources. You should use these scrubbers because they have great advantages for the environment. Although these scrubbers can remove most of the pollutants in the exhaust gas, they produce very little waste compared with wet scrubbers, which also eliminates the trouble of handling wet waste.

Dry industrial scrubbers are very effective. However, compared to wet scrubbers, they cannot remove as many pollutants as possible from the exhaust gas stream. When considering all industrial scrubber options, keep in mind that there are advantages and disadvantages to using a dry industrial scrubber.

Advantages of dry industrial scrubber

It does not produce any wet sludge, can collect acid gases with high efficiency, does not require much space, can include fabric filters to effectively control particles, can handle airflow at high temperatures, and has almost no maintenance costs.

Disadvantages of dry industrial scrubber

The control efficiency of acid gas is not as high as that of wet scrubbers, any unburned residual waste powder will still need to be processed, the use of dry industrial scrubbers to scrub the cost is higher, the system cannot remove all types of pollutants in the gas you transport .

How to use dry industrial scrubber?

When you install a dry industrial scrubber, the dry reactants will be introduced into the gas stream at a very high speed, which helps to neutralize any contaminants contained in the gas. In this process, three steps need to be performed, of which the first step involves cooling the gas. In order to effectively prepare the exhaust gas, an evaporative cooler will be required to cool the exhaust gas. This step helps simplify the system's process of removing contaminants from the gas.

Once cooling occurs, the injected reagent will be applied to the gas, which is when the contaminants and contaminants are finally removed. Sodium bicarbonate is a very common dry reagent used in this process. Various reagent powders are mixed under high pressure and then guided into the exhaust gas. The chemical reaction that occurs at this time reduces the acidity and eliminates harmful pollutants. Then, when the cleaning gas passes through the vent, the fabric filter at the bottom of the system will collect the washing powder.

Use of wet and dry scrubbers in industrial applications

If any kind of harmful gas is produced in the industrial process of a factory or wastewater treatment plant, wet and dry scrubbers can be used to help you eliminate the harmful gas and the pollutants contained in the gas. Using one of these scrubbers prevents you from causing unnecessary damage to the environment and any homeowners living near your facility. The types of gases that can be treated with wet or dry scrubbers include sulfur dioxide, chlorine, hydrogen sulfide, and hydrogen chloride.

When you choose a water quality analyzer, you will find that we provide many sensors that allow you to monitor the concentration of the washing solution, which is essential for eliminating harmful pollutants in a certain gas. For example, hydrogen chloride gas requires a caustic scrubber solution with a concentration of 10% to 15%, and it is best to use one of our conductivity sensors (such as the SensoPRO Monitoring System) for measurement. On the other hand, sulfur dioxide gas requires a lime scrubbing solution, which can be measured most effectively with a pH sensor such as the S272CD process sensor.

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