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Our company is regarded as a famous single-tube rotary dryer supplier and industrial rotary dryer manufacturer in China.
Processing capacity: 2.5-50 t/h
Application area: industries of slag, sand, construction materials, metallurgy, chemical engineering, coal and minerals.
Applied materials: slag, clay, limestone, ardealite, dry-mixed mortar, grain slag, coal slime, etc.
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There are two designs for dry scrubbers. The difference is in the dry absorber design. For the first type, the dry absorber utilizes a fluidized bed—either bubbling bed or circulation bed. The bed of the absorber is initially charged with reagents. The combustion product gases, laden with acid gases pass through the reagent bed where the absorption and chemical reactions occur to remove the acid gases. Then, the combustion product gases, the reagent, and reaction products enter a bag house filter where cloth filters allow clean air to pass through while the solids are captured and fed back to the absorber, or removed for discharge. The majority of reagents are recirculated back to the absorber with only a small portion discharged continuously with the absorbed products. Raw and fresh reagents are charged continuously to the absorber to compensate for the discharge losses. The absorber provides the first stage removal of acid gases while the reagents coated on the filter bags provide the second stage of the acid gases removal. The reported sulfur dioxide removal efficiency can be as high as 98% (Zwers, 2011). Although this type of design has high removal efficiency, the high initial capital costs and the operation complexity limit its application
The second design utilizes a reagent injection system to inject the reagents directly into the combustion product gas stream, either in a separate chamber or in the hot gas duct. This design provides utilization of reagents once. The reagents coated on the filter bags are the only removing mechanism for acid gases removal. Compared with the first design, the efficiency is lower and the reagent wastes are higher. However, the initial capital is much lower and the operation is much simpler
Semi-dry scrubbers involve a chemical reaction with a wet slurry, and a dry scrubbing of the gases with dry collection of co-products. Typically the process is used to treat acid gases in a spray dryer, coupled with a pulse-jet fabric filter. In the scheme shown in Figure 6.13, with a vertical downflow spray dryer, an alkaline slurry is injected to neutralize the acids present in the flue gas. The gas temperature is controlled by the flow rate of the dilution water
The heat of the flue gas evaporates the water present in the slurry, leaving fine, dry particles of salt, fly-ash and excess alkali to be collected in the fabric filter (other forms of filter medium, including ceramic and metallic, are possible). As the gas passes through the cake on the filter bags, a further reduction of the acid gas occurs as it reacts with the excess reagent in the filter cake; purified exhaust gases are then vented through a chimney equipped with a continuous monitoring system. The fly-ash, salts and a minimal quantity of excess free agent are then transported from the fabric filter hoppers by mechanical or pneumatic conveying systems to a solids storage silo. A particular advantage of this process is that it allows control of high acid gas concentrations in large gas volumes
Spray dryers/dry scrubbers are used to control heavy metals. Spray dryers inject an alkaline slurry into the gas stream, causing water in the slurry to evaporate resulting in a cooling of the combustion gases. This cooling essentially de-vaporizes the heavy metals, allowing them to condense onto particulates. An electrostatic precipitator or fabric filter can then easily capture the heavy metal-bearing particulates. The USEPA recommends the use of a fabric filter for the most efficient removal of heavy metals. This method of collection usually provides removal efficiencies of about 99 per cent. However, the removal efficiency for mercury is only about 50 per cent. This lower efficiency is a cause of concern due to the high toxicity of mercury
Our printer and coding solutions include technologically advanced products including LINX CIJ printers, LINX Laser Coding and Marking equipment, LINX Thermal Transfer Overprinters (TTO), and Evolabel’s Print and Apply machines
Elixir Industrial Equipment, Inc. has been supplying the industries leaders of world-class manufacturing equipment to support the needs of manufacturers and businesses in the Philippines. With branches in Mandaue City, Cebu and Sta. Rosa, Laguna, we supply, install, and service a range of industrial equipment, including inspection, processing, packaging machines as well as industrial coders and printers
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