The development of the metallurgical industry will also bring serious threats to the environment and energy, mainly including flue gas pollution and emissions pollution, and higher energy consumption. The use of emissions for heat recovery and product recovery will provide a reliable guarantee for the sound development of the metallurgical industry, and can achieve the purpose of saving energy, reducing emissions, and achieving the sustainable development of the metallurgical industry.
Jiaerda Machinery provides a variety of heat exchange products and services required by the process for many companies, from detachable plate heat exchangers to semi-welded plate heat exchangers to fully welded wide-channel plate heat exchangers, waste heat Recycling integrated systems, etc., are widely used in cooling systems, sulphuric acid systems, alumina process thermal energy utilization, electrolyte cooling, etc., and are committed to the development of energy-saving and emission-reduction products and systems in the metallurgical industry. Coking by-product recovery systems, etc., provide users with systematic solutions for energy saving and emission reduction and create considerable benefits for users.
The heat exchange products and systems required by the metallurgical industry use complex media and various product types.
Jiaerda Machinery can provide users with high-quality solutions in material selection, anti-corrosion design, and structural design, and achieve the ultimate and achieve intensive
Optimized operating system：
Steel smelting related coolers
Blast furnace closed water cooler
Electric arc furnace closed water cooler
Oxygen lance, secondary oxygen lance cooler
Continuous casting crystal water cooler
Cold rolled oil cooler
The production methods of alumina can be roughly divided into four types: alkaline method, acid method, acid-base combination, and thermal method. The alkaline method is divided into the Bayer method, sintering method, and Bayer-sintering combined method. The alkaline method is to treat aluminum ore with alkali, so that the alumina in the ore is converted into sodium aluminate solution. The iron, titanium, and other impurities and most of the silicon in the ore become insoluble compounds, and the insoluble residue (red mud) ) It is separated from the solution, and the useful components are recovered by washing. The pure sodium aluminate solution is separated into aluminum hydroxide, which is separated from the mother liquor and washed, and then roasted to obtain the finished aluminum oxide.
The application of plate heat exchanger in the alumina industry is mainly to cool the semen in the decomposition section, which is cooled to the process temperature by step-by-step cooling (respectively heat exchange with mother liquor and water). Since semen (oversaturated sodium aluminate solution) is easy to "scar", the plate heat exchanger needs to be cleaned regularly, and the cleaning liquid is a strong alkali or strong acid. Plate material can choose 316L, 254SMo, AL-6XN, etc.
The all-welded wide-channel plate heat exchanger is used in the intermediate cooling section of the decomposition and classification process in the alumina production process, and is installed on the top of the decomposition tank to cool the aluminum hydroxide slurry in the decomposition process.
Its main applicable features are as follows:
The operating medium on the side of the wide channel is aluminum hydroxide slurry, and the flow rate of the medium is generally 0.6 to 1.2 m/s. The high flow rate drives the slurry containing solid particles to flow on the surface of the plate, which will not cause material accumulation or scarring and clogging.
There is no contact on the side of the wide channel, the fluid can flow freely, and it fills the entire flow channel formed by the plate. The surface of the plate almost participates in the heat exchange, and the flow without a "dead zone" is realized in the flow channel.
The slurry inlet and outlet are equipped with a distribution structure. The slurry first passes through the distribution port, then enters the distribution box, and finally enters each wide channel evenly.
Both the slurry side distribution box and the cooling water side pipe box adopt a detachable structure with a flat cover plate, and the sliding door principle can be disassembled at any time.
The ball-shaped welding structure with a good force-bearing form is adopted between the plate pairs, and the pressure-bearing capacity is stronger.
The plate material is SAF2205 (S31803) duplex steel, which is a high-quality solution to corrosion and abrasion.
The form of the plate bundle is horizontal, and the slurry enters and exits from the bottom to effectively inhibit the sedimentation and scarring of the slurry.
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