Infrared rays #002
The thermal efficiency is 0.95. The main part of the infrared rays emitted by an electric lamp is approximately in the range from 0.8 to 3.5 microns. Incandescent electric lamps are mounted on special panels inside dryers. But the type and size of the infrared dryer itself depends on the size and shape of the material or product that needs to be dried. Typically, infrared dryers are made of three types: portable (in the form of caps), belt and tunnel. Belt dryers are horizontal belts to which lamps are suspended. It is open on both sides. Of course, its shape, dimensions, and the design itself may vary.
Well, tunnel dryers have the appearance of tunnels. On their inner surface there are rows of electric lamps of the Z type. There can be a lot of them. For example, in an infrared tunnel dryer for drying paint and varnish coatings on car bodies, the number of lamps reaches 35 thousand. In construction, it is sometimes necessary to dry the walls of new buildings after plastering. Infrared drying is also necessary here. For this purpose, a cantilever structure has been made, at the top of which panels with lamps emitting a large percentage of infrared rays are located at a certain angle. The whole structure is easy to move around the field area on wheels. The walls are dried from a distance of 30-40 cm. It is very important that the rays fall on the wall perpendicular. In construction practice, you also have to deal with loose materials, such as sand. Another area of application of infrared rays is related to the acceleration of concrete hardening in products and structures. It all started with the fact that in modern factory and landfill production of precast concrete, it became necessary to accelerate the hardening of concrete in freshly molded products (based on cement concretes).
This problem was solved by thermal and moisture treatment of all reinforced concrete products manufactured at the factory or landfill, i.e. the products were steamed in special chambers. Despite the fact that this method is still used everywhere, builders have always been dissatisfied with it. There were many reasons. First of all, the method requires a complex and expensive steam management of steam chambers, boiler installations and a thermally insulated network of steam pipelines. In addition, the use of steam as a heat carrier makes it difficult to automate the process. Finally, the temperature in the steaming chamber does not exceed 100 C. Therefore, steaming of the product takes quite a long time, usually 28 hours. All these considerations were the basis for the search for new, more efficient methods of heat treatment of precast reinforced concrete. One of these methods was heat treatment with infrared rays. This method allows you to get a heating temperature of 800 C. Accordingly, the heat flow capacity of the infrared heating chamber is 70 times greater than that of convective heating using steam heated to 100 C.
Just as during steaming, infrared heating accelerates the hardening of concrete (by about 6-8 hours). It is also very important that the energy of infrared rays does not change the reaction of hydration and the formation of cement stone. The infrared heating method is more economical than steaming: the heat consumption during infrared heating is 3272 MJ/m2, and during steaming — 1092 MJ/m2. Due to this, the cost of heat treatment is reduced by 15-18%. The loyalty program and regular promotions complement this generous welcome bonus perfectly for active players. To activate the welcome offer, remember to use
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