Dynamic front running double-effect falling film evaporator, the working principle and characteristics of a double-effect falling film evaporator operating principle of double effect falling film evaporator www.wzgoody.com material into the rear of a single-effect falling as above film evaporators similar, but it is to have two sets of the above equipment, to enable them to make better use of steam, secondary steam, steam and other three. Double-effect falling film evaporator countercurrent operation, in a concentrated solution of a first discharge opening effect, each temperature than other high efficiency, decreased solution viscosity can, favor higher concentrations concentrated solution, to obtain 75% of the concentrate. Each effect evaporator www.wzgoody.com/Product/zfq/jmzf.html level controllers are installed, with the import pipeline control valve to maintain a constant level of each effect. Boiler steam supply line provided with a control valve, according to the first effect heating steam pressure sensor and a pressure controller to control the valve to achieve the purpose of heating the steam pressure constant. Condensate each effect emissions are brought together to pour jugs, cans side with liquid level controller, with the pump discharge outlet tube evaporator control the liquid level reaches a predetermined height. Works: Material dilute solution feed pump into the second effect via the circulating pump suction port, after the booster pump, the preheated feed enters the second effect evaporator chamber at the top, and then into the heating tube and evaporated into the separator room, steam, liquid separation in this solution into the pump suction from the bottom, with a pumping preheater, feed room heating pipes, separate rooms for circulation and evaporation. Evaporated vapor from the separation chamber into the side of the steam separator further separating entrained liquid droplets from the bottom of the separator back into the separation chamber, and after the clean secondary steam discharge into the condenser is totally condensed. The outlet of the circulation pump has a path to the first effect of the solution pump suction port, the first effect is basically the same operation with the second effect, the first effect of the secondary steam as the heating steam fed to the second effect. The first effect of the heating steam boiler is supplied directly from the condensate returned to the boiler room. In addition, there is a pump outlet channel discharging the concentrate adjusted to maintain the concentration of emissions in the discharge liquid. Double-effect falling film evaporator features a compact (1) structure, reasonable layout, small footprint, easy installation; high (2) production efficiency, evaporation; (3) energy-saving effect is remarkable, energy consumption is only generally falling film evaporator concentrate about 1/2 the time of production. QA / Q≤0.65, QB / Q≤8 (Q for water evaporation, QA for steam consumption, QB for the cooling water consumption); (4) the system can control the system with PLC programming, equipment, process parameters can be setting, control, raw material liquid and cooling water can be automatically controlled. System control accuracy: temperature ± 1 ℃, pressure ± 0.01 MPa, liquid height 10mm.