Shell and tube heat exchanger unit
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1. Unit Overview
The high-efficiency intelligent heat exchanger unit designed and manufactured by our company is a complete set of heat exchange equipment organically combined. It can perform steam-water and water-water heat exchange. Users only need to connect the pipelines and power supply to use it.
The unit body consists of a heat exchanger, circulation pump, descaling device, connecting pipelines, and base frame. The compact structure and small footprint significantly shorten the connecting pipelines between the equipment, reducing both investment and operating costs.
The heat exchanger uses our company's high-efficiency threaded tube heat exchanger.
The pumps, valves, and pipes配套 the unit are all high-quality products.
The unit operates with energy saving, stable load, low noise, reliable performance, and low maintenance rate.
2. Heat Exchanger
Our company's high-efficiency threaded tube heat exchanger is used. The heat exchange tube material is 304 stainless steel. It is developed based on absorbing advanced technologies at home and abroad and the heat transfer enhancement theory of heat conducting materials. Due to the special forming method, the heat transfer area is increased on the inner and outer surfaces of the tube, increasing the turbulent heat transfer effect of the heat medium on the outer surface of the tube. It has the characteristics of high heat transfer coefficient, not easy to scale, small water-side resistance, saving circulating power consumption, not easy to leak, small thermal stress, automatic compensation of temperature difference stress, stable operation, and low noise.
The steam-water heat exchanger heat exchange process is designed according to full countercurrent flow, and a semi-closed condensate cooling section is set up. The condensate water temperature is low, saving steam consumption. When selecting the heat exchanger, both the saturated steam condensation section and the condensate cooling section are considered. That is, one heat exchanger realizes two-stage heat exchange: the upper part of the heat exchanger is the saturated steam condensation section; the lower part is the condensate water-water heat exchange.
Threaded tube heat exchanger manufacturing process:
a. Manufacturing of threaded tubes: Using a fully automatic CNC dedicated rolling mill, inner and outer roller rolling, and solid solution treatment to reduce processing stress. To ensure strength, stainless steel threaded tubes (1.0 mm) are used. Each spiral groove is smoothly rounded, formed in one inner and outer pass. Each heat exchange tube is inspected by eddy current flaw detection to ensure a 100% qualified rate.
b. Tube plate processing and manufacturing: Tube plates are formed by forging high-quality steel billets. After rough machining and finishing, they are processed, punched, and grooved in one pass using a double-headed automatic CNC tube plate deep-hole drilling machine and a large vertical lathe. This ensures processing accuracy and product quality.
c. Welding process: The connection between the tube bundle and the tube plate uses a welding and expanding process. Welding uses a fully automatic argon arc welding machine, with the weld inspection pass rate exceeding 98%. For the welding of tubes and tube plates, to ensure the minimum molten pool depth is two-thirds of the given tube wall thickness, sufficient filler metal is applied, ensuring the reliability of the connection between the heat exchange tube and the tube plate. Expanding uses a digital program-controlled hydraulic expanding machine and flexible liquid bag expanding to ensure expanding quality.
The baffle plate uses a special mold to ensure concentricity with the tube plate, and the tube bundle installation uses a special jig for positioning.
The shell and flange are made using a submerged arc automatic welding machine to ensure welding quality and appearance.
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