Vaporization system for preheating stock solution
An evaporation system and pre-heating technology, applied in evaporation, multi-effect evaporation, chemical instruments and methods, etc., can solve the problems of heat energy loss and small number of flash evaporation stages
Inactive Publication Date: 2009-11-18
HANGZHOU JINJIANG GROUP
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Problems solved by technology
Dissolution is the key process of producing alumina by Bayer process. The current dissolution equipment has few flash stages, and the exhaust steam generated after flash evaporation is directly discharged to the atmosphere, resulting in a large amount of heat loss.
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[0015] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0016] figure 1 A schematic structural diagram of an evaporation system for preheating raw liquid in an alumina production line provided by an embodiment of the present invention is shown. The system includes: a stock solution tank 1 for containing the stock solution; a casing heater 2 connected to the stock solution tank 1 and a dissolution device 3 for heat exchange between the stock solution and flash steam; the dissolution device 3 includes several stages The flash tank is used to generate flash steam, wherein at least the final flash tank is connected to the sleeve heater 2, and the rest of the flash tanks are respectively connected to the sleeve preheater and the pr...
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The invention discloses a vaporization system for preheating stock solution, comprising a stock solution groove, a tubular heater, a dissolution device and an evaporator; wherein, the tubular heater is connected with the stock solution groove and used for heat exchange between the stock solution and flash-off steam; the dissolution device comprises a plurality of stages of flash drums, and the last stage of flash drum is connected with the tubular heater; the evaporator is also connected with the tubular heater and used for evaporating the heated stock solution. The system utilizes the flash-off steam which is flash-evaporated by a high pressure dissolution system to preheat the stock solution to be evaporated by using the tubular heater. The technical proposal not only can be used for recycling the flash-off steam to avoid a great deal of energy loss as the flash-off steam is directly exhausted into atmosphere, but also reduces the steam consumed by the evaporator for heating the stock solution.
Description
technical field [0001] The invention relates to the field of alumina production, in particular to a system for heating raw liquid by using flash steam (lack steam). Background technique [0002] Exhausted steam refers to various low-temperature and low-pressure steam discharged after new steam does work, high-temperature condensed water flashed, and material concentrated and evaporated. The enthalpy value of exhausted steam is close to that of fresh steam, and it is a very precious heat energy resource and water resource. Dissolution is the key process of producing alumina by Bayer process. The current dissolution equipment has few flash stages, and the exhaust steam generated after flash evaporation is directly discharged to the atmosphere, resulting in a large amount of heat energy loss. However, the stock solution to be evaporated requires a large amount of steam to heat it. If the exhaust steam generated after flash evaporation can be used to preheat the stock solution ...
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IPC IPC(8): B01D1/00B01D1/26C01F7/04
Inventor 冯雨田唐希英年伟
Owner HANGZHOU JINJIANG GROUP