How Multi-effect wastewater evaporation works
The dilute solution of the multi-effect wastewater evaporation enters the suction port of the third-effect circulating pump through the raw material pump. After the pump is pressurized, it enters the feed chamber at the top of the third-effect evaporator through the preheater, and then enters the heating tube for heating and evaporation. Separation chamber, where vapor and liquid are separated, the solution enters the pump suction port from the bottom, and is circulated and evaporated by pumping preheater, feed chamber, heating pipe, and separation chamber.
The steam evaporated from the multi-effect wastewater evaporation enters the separator from the side of the separation chamber, further separates the droplets entrained with the steam at the bottom of the separator, and flows back to the separation chamber, and the quiet secondary steam is discharged into the condenser and fully condensed. The outlet of the circulating pump has a branch, which transports the solution to the pump suction port of the second effect, and operates in the same way as the third effect, and the secondary steam of the second effect is sent to the third effect as heating steam. Likewise, there is a branch at the outlet of the second effect pump that feeds the solution into the suction port of the first effect pump. The operation of the first effect is basically the same as that of the other two effects, and the second effect of the first effect is sent to the second effect as the heating steam. The most efficient heating steam is directly supplied by the boiler, and the condensed water is returned to the boiler room. In addition, the pump outlet has a branch to discharge the concentrate, and the discharge volume is adjusted to maintain the concentration of the discharge liquid.
When the multi-effect wastewater evaporation is operated in countercurrent, the discharge port of the concentrate is efficient, and the temperature is higher than other effects, which can reduce the viscosity of the solution, which is conducive to the concentration of the solution with higher concentration, and can obtain 75% of the concentrate.
Multi-effect wastewater evaporation is equipped with a liquid level controller, which cooperates with the control valve of the inlet pipeline to keep the liquid level of each effect constant. The boiler steam supply pipeline is equipped with a control valve, and the valve is controlled according to the efficient heating steam pressure sensor and pressure controller to achieve the purpose of constant heating steam pressure. The condensed water discharged by each effect is collected into the condensed water tank. The side of the tank is equipped with a liquid level controller, which cooperates with the outlet pipe of the drain pump to control the liquid level of the evaporator to the specified height.