The term wet scrubber describes a variety of devices that remove pollutants from a furnace flue gas or from other gas streams. In a wet scrubber, the polluted gas stream is brought into contact with the scrubbing liquid, by spraying it with the liquid, by forcing it through a pool of liquid, or by some other contact method, so as to remove the pollutants. The design of wet scrubbers or any air pollution control device depends on the industrial process conditions and the nature of the air pollutants involved.
Inlet gas characteristics and dust properties if particles are present are of primary importance. The versatility of wet scrubbers allow them to be built in numerous configurations, all designed to provide good contact between the liquid and polluted gas stream. Wet scrubbers remove dust particles by capturing them in liquid droplets.
The droplets are then collected, the liquid dissolving or absorbing the pollutant gases. Any droplets that are in the scrubber inlet gas must be separated from the outlet gas stream by means of another device referred to as a mist eliminator or entrainment separator these terms are interchangeable. Also, the resultant scrubbing liquid must be treated prior to any ultimate discharge or being reused in the plant.
A wet scrubber's ability to collect small particles is often directly proportional to the power input into the scrubber. Low energy devices such as spray towers are used to collect particles larger than 5 micrometers. To obtain high efficiency removal of 1 micrometer or less particles generally requires high-energy devices such as venturi scrubbers or augmented devices such as condensation scrubbers.
Additionally, a properly designed and operated entrainment separator or mist eliminator is important to achieve high removal efficiencies. The greater the number of liquid droplets that are not captured by the mist eliminator, the higher the potential emission levels. Wet scrubbers that remove gaseous pollutants are referred to as absorbers. Good gas-to-liquid contact is essential to obtain high removal efficiencies in absorbers. Various wet-scrubber designs are used to remove gaseous pollutants, with the packed tower and the plate tower being the most common.
If the gas stream contains both particulate matter and gases, wet scrubbers are generally the only single air pollution control device that can remove both pollutants. Wet scrubbers can achieve high removal efficiencies for either particles or gases and, in some instances, can achieve a high removal efficiency for both pollutants in the same system.
However, in many cases, the best operating conditions for particles collection are the poorest for gas removal. In general, obtaining high simultaneous gas and particulate removal efficiencies requires that one of them be easily collected i. For particulate control, wet scrubbers also referred to as wet collectors are evaluated against fabric filters and electrostatic precipitators ESPs. Some advantages of wet scrubbers over these devices are as follows:.
Some disadvantages of wet scrubbers include corrosion, the need for entrainment separation or mist removal to obtain high efficiencies and the need for treatment or reuse of spent liquid. Wet scrubbers have been used in a variety of industries such as acid plantsfertilizer plants, steel millsasphalt plants, and large power plants. Since wet scrubbers vary greatly in complexity and method of operation, devising categories into which all of them neatly fit is extremely difficult.
Scrubbers for particle collection are usually categorized by the gas-side pressure drop of the system. Gas-side pressure drop refers to the pressure difference, or pressure dropthat occurs as the exhaust gas is pushed or pulled through the scrubber, disregarding the pressure that would be used for pumping or spraying the liquid into the scrubber.
However, most scrubbers operate over a wide range of pressure dropsdepending on their specific application, thereby making this type of categorization difficult. Another way to classify wet scrubbers is by their use - to primarily collect either particulates or gaseous pollutants.
Again, this distinction is not always clear since scrubbers can often be used to remove both types of pollutants. Wet scrubbers can also be categorized by the manner in which the gas and liquid phases are brought into contact. Scrubbers are designed to use power, or energy, from the gas stream or the liquid stream, or some other method to bring the pollutant gas stream into contact with the liquid.
These categories are given in Table 2. Corrosion can be a prime problem associated with chemical industry scrubbing systems. Fibre-reinforced plastic and dual keys are often used as most dependable materials of construction. From Wikipedia, the free encyclopedia. This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources.A wet scrubber, or wet scrubber system, is a type of pollution control equipment that is designed to remove harmful gases and particulates from industrial exhaust streams.
It works by funneling the exhaust stream through the bottom of a packed tower and then it passes through an engineered packing, where a solution from specialized nozzles is sprayed countercurrent to the exhaust stream flow.
This solution can often be water, especially when the stream is primarily dust or dust like particles. When the waste gas has lower solubility, chemicals are usually added to the solution. These chemicals are carefully chosen to react with the compounds released in the exhaust stream, which are generally acidic gases.
The clean air is then released into the atmosphere; although it is clear of VOCs and dangerous compounds, the gas released from the scrubber often looks like steam. This is because it is heavy with H 2 O vapors, which may be visible in the air at the time of release.
Packed, dry and wet scrubbers are used to treat or clean the following lists of chemicals from a process exhaust air stream, with ammonia being the most popular:. Wet vs Dry Scrubber. Both types of scrubbers perform the same basic function — removing dangerous particles from industrial gas streams. However, how they do it is slightly different. As their names indicate, a wet scrubber uses a solution, generally water or water based, to saturate the particulates and compounds in the exhaust stream, to weigh them down, and remove them from the gases.
A dry scrubber does not saturate the particles; a dry scrubber uses dry reagents, that come into contact with the polluted stream, that then react, and either neutralize the dangerous compounds, or absorb them into a different, less harmful, substance. Gulf Coast Environmental Systems offers multiple design solutions to best fit the operational parameters of its customers.
In some cases, the desire is for a lower capital investment for a higher operating cost for those systems that do not need to run continuously, or the need may be for a slightly higher capital investment with a lower operating cost for those systems that do need to run continuously. The designs include single-stage solutions, as well as multi-stage solutions. GCES also offers complete integrated solutions with other air purification systems, such as thermal oxidizerscarbon adsorption systemsor filtration packages.
Gulf Coast Environmental Systems is a single source solution for highly durable and efficient venturi and packed bed scrubbers.
Are you considering a dry scrubber? Click here! Gulf Coast Environmental Systems GCES is your custom solutions provider for pollution control systems, industrial ovens, systems engineering and field support worldwide.Jump to content. Low Flow in Pipes - posted in Ankur's blog.
Posted 10 May - PM. Posted 11 May - AM. Posted 27 September - AM. I take the responsibility for design the HCl Scrubber [ Community Forum Software by IP. Featured Articles Check out the latest featured articles. File Library Check out the latest downloads available in the File Library. New Article Product Viscosity vs. Featured File Vertical Tank Selection. This topic has been archived.
This means that you cannot reply to this topic. The pressure drop in side column nust not over 25 mm H2O. Are there any rule of thumb for roughly design or not? That I read in the book there are many parameters that we need to know first before design for example flow rate of water in and out. So if any one know please advise me. Posted 10 May - PM HiIf you are not familiar with absorption processI would advise you to contact the vendor of packing materials to design your scrubberhe should support your query.
Posted 11 May - AM Hi Nok In my industry experience, I've come across problems with acidic aerosol mist which needs to be considered also. In some applications a mist could form which can pass through some scrubber equipment types or configurations. HCl is one of those susceptable.
I attach a couple of references I came across just now as an introduction to the issue. Some alternate scrubber types in brochure one typical vendor, there are others. In this case you'll need an external heat exchanger in order to cool down the water recirculating solution.
Depending on operating conditions and temperature, you'll have to manage a hot concentrate HCl liquid solution. Are you sure the value is 25 mmH2O?
Back to Packed Tower Design and Operation. Sign In Need an account? Register now! I've forgotten my password. Remember me This is not recommended for shared computers.Jump to content. Low Flow in Pipes - posted in Ankur's blog.
Posted 21 June - AM. Posted 21 June - PM. Posted 29 June - AM. Posted 03 July - AM. Community Forum Software by IP. Featured Articles Check out the latest featured articles. File Library Check out the latest downloads available in the File Library. New Article Product Viscosity vs. Featured File Vertical Tank Selection.
This topic has been archived. This means that you cannot reply to this topic. Posted 21 June - AM hello sir i m abhijit from bsc chemistry student i need to know related to calculation of scrubber design n i m having totally new subject so sir pls help which books should i refer.
Scrubber Height Calculation
Posted 21 June - PM Do not allow panic, but try to be systematic and assimilate as much as possible. Clarification on the time allowed for this project of scrubber elementary design should have been given. First start with basics. Read e. Good books on the subject have been also published in India, using SI units. This may be the most important step. Then go to something more specific, e. Probably you can easily find the book in the University library, since it is well known.
It is true that supplied data is limited compared to e. HF in the same book.Air Pollution Control Equipment pp Cite as. In dust scrubbers the dust particles are removed from a gas stream by a dispersed liquid. The difference in the design of various scrubber is primarily due to the mechanism by which the liquid is dispersed. Unable to display preview. Download preview PDF.
Skip to main content. Advertisement Hide. Design and Operation of Wet Dust Scrubbers. This process is experimental and the keywords may be updated as the learning algorithm improves. This is a preview of subscription content, log in to check access. Brocke: Apparate und Verfahren der industriellen Gasreinigung.
Band 1: Feststoffabscheidung; R. Google Scholar. Eisner: Wasser Luft Betrieb 14 Holzer: Chem. CrossRef Google Scholar. Holzer: Staub-Reinh. Luft 34 Schuch, F. Clausthal, An Engineer's Choice. Hi Ajay, u had done a fabulous job. How u can take Cf as 32 and J represents what?
DearThanks for the compliment, Cf is taken from table. Next time, kindly comment with you name. Regards, T. Hi ajay parth here we are doing our final year project on design and analysis of scrubber and fully confused regarding the project as we are not familiar with it if u could help tht could be great can u plz send ur contact no.
Hii kiran, Please clarify me, what exactly you want to calculate? Hi ajay, Please provide calculations regarding air flowrate calculation of a centrifugal blower ID Fan when delta P,temperature and density of the process fluid is known. Please post the calculations if you have any. Hi ajay, Please provide calculations regarding air flowrate calculation of a centrifugal blower ID Fan when delta P,Temperature and density of the process fluid is known.
Thanks in advance. So a carbon dioxide scrubber is a gizmo that will remove CO2 from the air you send through it. It's usually contains a base, because CO2 is acidic; the by-product is a non-volatile salt. Pharma Engineering. Latest Loading Wednesday, 21 March scrubber.
Design and Operation of Wet Dust Scrubbers
Ajay Kumar Calculationsdesignpressure calculationscrubber. You may also like:. Column Cross-Sectional area Calculation. Pressure Drop Estimation. Flooding Estimation across column. HETP Prediction. Related Posts:. I am Ajay Kumar Kalva, Currently serving as the CEO of this site, a tech geek by passion, and a chemical process engineer by profession, i'm interested in writing articles regarding technology, hacking and pharma technology. Read more. Labels: Calculationsdesignpressure calculationscrubber.
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Packed Tower Wet Scrubber
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