The test building is a new type of energy-saving and environmental-friendly residential model project using phosphogypsum produced by the phosphoric acid plant as raw material, phosphogypsum block as the inner wall, cast-in-place phosphogypsum as the outer wall and phosphogypsum formwork box as the long-term template. The building structure replaces the masonry structure of traditional clay bricks and cement bricks. It not only functions as a cast-in-place board, but also plays a role in building insulation and sound insulation. It has achieved the goal of “building environmental protection, energy conservation, consumption reduction, and ecological civilizationâ€. . Among them, the dense beam plate and column structure solves the problems of the traditional frame beam and pillars with large area-to-area structure. The beams and columns cannot be seen in the room, and the functions of “large bays, large pillar nets, and flexible division of rooms†are realized. The residential sample project has a construction area of ​​5,670 square meters. The steel consumption per square meter is 50.5 kg, the amount of cerium used is 0.3 m3/?, the amount of consumption of phosphogypsum is 0.29 m3/?, and the unit price is 1119.9 yuan. Its concrete, steel reinforcement usage, and cost are comparable to those of conventional building frames.
The completion and application of the new type of phosphogypsum energy-saving and environmental protection structural test building will surely play a leading role in the industry to relieve the pressure on the accumulation of phosphogypsum “residue slagâ€.
Plate and gasket are the critical part of a removable Plate Heat Exchanger. The main function of the plate is to isolate the medium and perform heat exchange. Its main materials are stainless steel (304/304L, 316/316L, 254SMO), titanium, nickel, titanium-palladium alloy, Hastelloy, etc. The sealing gasket is installed in the gasket groove around the plates to seal the periphery between the plates to prevent the fluid from leaking out, and according to the design requirements, seal part of the corner holes so that the hot and cold media flow according to their own flow paths. The structure of the plate heat exchanger consists of a fixed frame, a movable frame and corrugated plates sandwiched between the two frames. Hot and cold liquids pass sequentially through the area between the corrugated plates separated by sealed elastomer paths. To prevent leaks, good gasket elastomers are installed around the perimeter of the plates and large fastening bolts are used to hold the plates together. The structure of the plate heat exchanger makes sealing a key part of this equipment, responsible for the service life of the entire equipment. Depending on the process medium, the gasket must be chemically and/or temperature resistant. Spetech supplies seals for most existing plate heat exchangers: power industry, petroleum processing, food and beverage industry, sugar industry, chemical, pulp and paper industry. The most commonly used materials are: NBR, HNBR, EPDM, FPM (different grades). There are two basic ideas for the installation of seals: glue seals and clip seals. Clip-on washers do not require any adhesives for installation. This modification makes it possible to mount the spacers by installing clips in the grooves in the plate. As a result, the gasket is highly resistant to pressure and can be replaced quickly and easily.
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