What is gas scrubbing system?
Gas scrubbing system, also known as gas scrubber, is a device that uses liquid to trap dust particles or gas contaminants in the gas stream so that the gas can be cleaned. It can be used to remove both particulate pollutants and certain gas pollutants.
Gas scrubbing system includes units consisting of a water scrubbing tower, potassium scrubbing tower, gas storage bladder, adsorption tower, defoamer, mist eliminator, spraying system, etc. It can collect acidic residual gas or solids from sulfonation ashing for purification treatment. Super corrosion-resistant exhaust pipe channel and adjustable gas retention amplifier can quickly remove a large amount of smoke and volatile gas from the exhaust port.
Gas scrubbers are devices that achieve close gas-liquid contact to separate contaminants from waste. It can be used for both gas dust removal and gas absorption to remove gaseous pollutants, as well as for gas cooling, humidification, and mist removal operations. The gas scrubber has a simple structure, low cost, high purification efficiency, and is suitable for purifying non-fibrous dust. Especially suitable for purifying high-temperature, flammable and explosive gases.
What is gas scrubbing?
Gas scrubbing is the process in the practice of scrubbing a gas with a liquid in a specialized apparatus (usually in an upright cylinder forming close contact between gas and liquid). The most common method of gas scrubbing: the gas is scrubbed as a continuous phase and the scrubbing liquid as a dispersed phase.
Working principle of gas scrubbing system
The most commonly used gas scrubbing and absorption method refer to gas scrubbing with the gas as the continuous phase and the scrubbing liquid as the dispersed phase. Gas washing by spraying liquid in a uniform gas stream, mainly using the liquid dispersion function of the nozzle and different gas-liquid velocities to achieve contact mixing. Venturi tube gas washing, mainly using the pressure boost before the throat, the throat in the violent turbulence, and after the throat of the jet turbulence to achieve gas-liquid mixing contact and heat transfer. Impingement flow gas washing, mainly using liquid impact, capture, turbulence, and other kinds of left and right to complete the gas-liquid mixing contact, so as to complete the gas-to-liquid mass transfer heat transfer.
The boiler flue gas purification process is first of all a gas-solid non-homogeneous system, into a gas, liquid, and solid system, such as a spray washing process, venturi process, as far as possible to mix the gas, liquid, and solid tri-state material. The main principle of boiler flue gas spray washing is inertial collision and interception, spraying the airflow of liquid droplets whose capture of dust particles mainly relies on the active collision of dust particles when spraying, rather than staying in the airflow, waiting for the airflow of dust particles in the airflow around it before the inertial collision; droplets and dust particles and collisions due to turbulence, diffusion, electrostatic force, and other interactions. After the capacity of the system is determined, the volume of the flue gas is determined within a certain range, and the time for the flue gas to pass through the purification equipment is determined, so the structure design should consider how to make the gas-liquid, gas-solid non-homogeneous phase system as soon as possible in the shortest possible time.
or other harmful gases such as NOx, HCl, H2S, NH3, etc. in the gas stream are gaseous substances, the separation of gaseous substances from the gaseous system is different from the purification principle of solid-liquid substances, and different methods are used, which require a slow airflow rate to facilitate sufficient contact time with the scrubbing liquid. The absorbed gas components react chemically with the scrubbing solution. The temperature, pressure, liquid-to-gas ratio of the scrubbing solution to the flue gas, the flue gas flow rate, and retention time in the equipment all affect the mixing and absorption efficiency in the system. In order to accelerate the chemical reaction, the movement of the gas stream should be in turbulence, because the diffusion effect of turbulence is greater than that of laminar flow, which can transfer mass and energy more efficiently, and the dissipation function is much faster than that of laminar flow.
The main process of venturi scrubbing
and absorbing gas: The flow velocity of dusty gas gradually increases after entering the constriction tube from the inlet tube, and the gas flow velocity reaches its maximum in the throat tube, and the relative flow velocity between the gas and liquid phases in the constriction tube and the throat tube reaches its maximum. The water droplets ejected from the nozzle are atomized under the impact of high-speed airflow and reach a turbulent state violently, and the gas and washing liquid is fully contacted and mixed at the throat. In the diffusion tube, the airflow speed decreases and the pressure rises, and the coalescence of dust particles or droplets as condensation nuclei is formed, coalescing into dusty water droplets with larger particle sizes, which are easier to be arrested and collected, thus achieving the purpose of dust removal and gas washing.
In summary, the design of equipment to make full use of spray interception, collision, turbulent mixing, gas-liquid vortex mixing, the venturi effect, etc. to complete the full contact between the scrubbing liquid and gas mixing, but also to ensure the mixing contact time, reduce the volume of equipment, reduce equipment resistance. Structure design, parameters to determine the focus of theoretical research clearly gas, liquid, solid material mixing relative motion and relative action must follow the laws of fluid mechanics, the full use of these laws, and reference to the existing successful design experience, improve the design so that the equipment to achieve the desired results.
Type of gas scrubbing system
Gas scrubbing system is a device that achieves close gas-liquid contact to separate contaminants from waste. It can be used for both gas dust removal and gas absorption to remove gaseous pollutants, as well as for gas cooling, humidification, and mist removal operations. Gas scrubber has a simple structure, low cost, high purification efficiency, and is suitable for purifying non-fibrous dust. Especially suitable for purifying high-temperature, flammable and explosive gases.
The types of scrubbers are mainly divided according to the gas-liquid contact method. There are several types of gas scrubbers used for gas dedusting such as gravity spray, cyclone, self-excited spray, foam plate type, packed bed, venturi, and mechanically induced spray. Dust removal mechanisms that play an important role in scrubbing include gravity settling, centrifugal separation, inertial collision and retention, diffusion, coalescence, and condensation. Regardless of the type of scrubber, particulate matter is separated with the help of one or more basic mechanisms. Special attention should be paid to the corrosion of pipes and equipment, the evil treatment of sewage and sludge, the reduction of flue gas lifts, and the generation of condensate gas water mist from winter exhaust.
Gas scrubbers have the advantages of simple construction, easy design and operation, use in high-temperature conditions, low cost, high dust removal efficiency, and very effective in capturing small dust particles. In many foreign industrial sectors such as steel, foundry, and chemical industries, scrubbers are widely used. However, the disadvantage is that air pollution may be converted into water pollution. Therefore, it is only applicable to the occasions where polluted water can be easily treated or where liquid-solid separation is easy to use.
Structure of gas scrubbing system
The high-efficiency and low-resistance gas scrubber absorption device is mainly composed of multiple mixed scrubber plate systems, rectangular gas pipelines, spraying systems, and so on. The spray atomization system is set in the upper part of the rectangular gas pipeline, and a number of equally spaced mixed scrubber plate systems are set at a certain distance below, one mixed scrubber plate system has a gas flow distribution plate, a gas flow guide plate, a vortex plate, and a gas flow guide plate, which are connected in a certain order.
The mixed scrubber plate system is the core component to complete low resistance gas-liquid or gas-liquid-solid efficient mixing and complete mass and heat transfer. The hybrid scrubber plate system is a very unique and creative structure verified by test and engineering practice. After the effective spraying system, the special flow channel is used to make the gas-liquid mix and collide many times to complete the efficient mass and heat transfer, which achieves low resistance and high efficiency in gas absorption treatment.
Multiple mixing and scrubber plate systems can be arranged in a gas duct with a rectangular cross-section, with equal height and equal spacing. The horizontal spacing between two mixing and scrubber plate systems is determined according to the gas flow rate, duct cross-section size, and the shape size of the vortex plate. The rectangular pipeline is separated into multiple airflow channels by multiple mixed scrubber plate systems with specific spacing, and a nozzle spraying system is set at a certain distance above the airflow channel to spray atomized absorbent fluid. When the gas-liquid mixed fluid passes through the airflow channel between the two plate systems, the continuous conversion between dynamic and static fluid pressure is realized due to the special structure of the airflow channel, which goes through the processes of pressurization, and deceleration, vortex, impact, decompression, and speed increase in turn. Under the action of the steering plate and vortex plate, part of the airflow produces vortex, and part of the airflow and vortex gas produce impact, thus increasing the gas-liquid mixing time and strengthening the gas-liquid or gas-liquid-solid contact mixing effect.
The high efficiency and low resistance gas scrubber and absorber device integrate the venturi turbulent mixing principle, vortex flow, and impact flow mixing principle, which can fully mix the gas and liquid many times under the low resistance, increase the gas-liquid contact time, increase the gas-liquid contact area, make the gas-liquid mixture fully, and the scrubber and absorber effect is good, and it is suitable for the working condition of gas flow fluctuation and dusty gas flow. Compared with the commonly used gas scrubbing equipment, this device has high absorption efficiency, a simple structure, low cost, and low resistance, and is suitable for large fluctuations in gas volume. It is easy to manufacture and install, and wide range of use.
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