Flue Gas Desulfurization Pump is suitable for rotary devices such as pulp pump, condensate pump, filter, pressure screen, chemical industry, pulping, filtration and sewage treatment. What are the advantages of Flue Gas Desulfurization Pump?
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1. Flue Gas Desulfurization Pump is an all-metal structure, the pump body is made of ultra-low carbon nitrogen-containing duplex stainless steel, and the impeller and wear-resistant plate are made of high-chromium wear-resistant alloy, which has excellent corrosion resistance, wear resistance and long service life.
2. Flue Gas Desulfurization Pump is a single-volute, single-stage, single-suction centrifugal pump with a "back-pull" structure. It is not necessary to disassemble the pump inlet and outlet pipelines when disassembling the impeller, mechanical seal, shaft and other components, which is convenient for maintenance.
3. Generally, a single-end cartridge mechanical seal is used, which is easy to disassemble and assemble. The impeller is designed with balance holes to avoid large particles from contacting the mechanical seal.
4. The axially adjustable structure design makes the impeller easy to adjust and maintains the gap between the impeller and the front pump cover and wear plate, so as to maintain the high efficiency of the pump.
5. The pump shaft has a large diameter and a short shaft head, which can reduce the deflection of the shaft during operation, thereby prolonging the service life of the seal.
6. The impeller and the shaft adopt double key connection and double locking device, which solves the problem of reverse rotation and falling off of the impeller during shutdown and backwashing.
7. Flue Gas Desulfurization Pump adopts thin oil lubricating bearing, equipped with oil level mirror and constant oil cup, which can fully ensure good lubrication; adopts safe and reliable labyrinth dust disk, which can effectively prevent the entry of dirt and impurities and prevent lubrication Oil spill.
In order to stay within strict emissions thresholds, coal-fired and energy-from-waste (EfW), steel plants and oil and gas refineries, use lime to remove sulphur dioxide (SO2) from their flue gas output. Although highly effective, the abrasive nature of lime presents a problem to the dosing pumps employed for this purpose. Many facilities using centrifugal pumps, for example, have experienced recurring problems with seal failures, leading to excessive maintenance and repair costs. The solution to this issue for a growing number of energy plants is peristaltic hose pumps, such as the Bredel range from Watson-Marlow Fluid Technology Group (WMFTG).
A recent case in point has seen the adoption of eight Bredel pumps as part of a flue gas desulphurization (FGD) process at a European EfW plant. Used for dosing abrasive limestone slurry, the Bredel pumps are helping the facility gain greater control over its processes and reduce OPEX (operational expenditure) costs.
According to the British Lime Association, lime plays a key role in many air pollution control applications, and is particularly adept at removing acidic gases like SO2 and hydrogen chloride (HCl) from flue gases. In fact, efficiencies are usually in the range of 95-99%.
The use of lime in all three main flue gas treatment processes - dry, semi-dry and wet - shows its flexibility and adaptability as a global flue gas treatment. Calcium oxide (CaO - quicklime), calcium hydroxide (Ca(OH)2 - hydrated lime) and calcium carbonate (CaCO3 - limestone or chalk), can all be used to neutralise acidic gases and remove SO2 from flue gases. This process helps to ensure that plants comply with both local and international environmental legislation for emissions.
In short, lime is the most cost effective and versatile alkali that can be used for flue gas treatment, with less dosage and lower waste production when compared with other reagents. For this reason, mineral lime reagents are used in abatement techniques at more than 85% of UK sites that treat flue gas.
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The number of EfW plants in the UK has seen a marked increase since . This trend is expected to continue until at least as the government targets a reduction in the landfilling of household and commercial waste, and looks to encourage more recycling and use of EfW.
Such policy development and the growing popularity of FGD can also be seen in many other countries around the world. In all locations, lime-based products can provide a cost-effective, efficient solution to the treatment of flue gases generated from the energy recovery process, in turn reducing the volume of waste sent to landfill. A further benefit of FGD is the creation of high grade by-products, such as gypsum, which is sold commercially for use in plasterboard manufacture and a variety of other industrial processes.
A variety of flue gas abatement techniques are in use today, each designed to suit particular applications. Dry scrubbing, for example, can be achieved using low-temperature dry injection. Here, hydrated lime is fluidised in air and injected directly into the exhaust ducting. In general applications, over 95% of SOx (sulphur oxide) can be removed, along with more than 99% of the HCl and over 95% of the HF (hydrogen fluoride).
High temperature dry injection is another type of dry scrubbing technique where hydrated lime is injected into the kiln at temperatures in excess of 850C. The hydrated lime decomposes within 30 milliseconds to produce a porous and very reactive form of quicklime. This process can reduce reagent consumption if combined with traditional, lower temperature alkali scrubbing processes.
When it comes to semi-dry scrubbing, calcium hydroxide in water (called milk of lime or sometimes liquid lime) is atomised at the top of a spray dryer chamber into hot flue gases of approximately 220C. The water in the milk of lime evaporates, cooling the gases (SO2 and SO3, together with any HCl/HF present), which dissolve and react with the lime. Semi-dry scrubbing is capable of removing up to 95% of SOx, and up to 99% of HCl and HF.
However, it is wet scrubbing that is considered the principal flue gas abatement technique, where crushed limestone is added to water before the resulting alkaline reagent slurry is sprayed into a flue gas scrubber or tower. In a typical system, the gas to be cleaned enters the bottom of a cylinder-like tower and flows upwards through the limestone slurry spray.
An important aspect is the volume ratio of reagent slurry to flue gas, which is known as the L/G ratio. L/G ratios are usually 1:1 (litres of slurry to Nm3 of flue gas) in wet scrubbing applications. It is in this application that reliable, high-performance pumps have a fundamental role to play.
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