Single-effect evaporator for chemical waste incinerator
Source: Date:May 21, 2026 Click:
Project Name: MMA Chemical Waste Liquid Incinerator Waste Liquid Pretreatment System (hereinafter referred to as "MMA Incineration System")
Evaporator Type: Single-Effect Evaporator
Equipment Specifications: Processing Capacity 4.2t/h
Project Overview:
Water Quality Characteristics and Process Analysis:
MMA Incineration System: This is a waste liquid pretreatment system for an MMA chemical waste liquid incinerator, containing ammonium sulfate, methyl methacrylate polymer (MMA), organic compounds, COD, and other components.
MMA Incineration Water Quality: The raw water is a yellowish-brown opaque liquid with a high COD. Water quality testing revealed that when the liquid is naturally cooled to approximately 40-45℃, its fluidity is very poor, and it begins to stick to the pipes. Upon cooling to room temperature, the concentrated liquid has a very high viscosity, resembling syrup. Therefore, this liquid is not suitable for crystallization through cooling.
Project Objective: To reduce waste liquid volume and ammonium sulfate content through evaporation, concentration, and crystallization technology, thereby reducing the corrosion of the incinerator system by SO2 acidic gas generated during waste liquid incineration, alleviating the processing pressure on the incinerator system, and ensuring long-term stable and continuous operation of the incinerator unit with emissions meeting standards.
Project Challenges: The treatment of high-boiling-point organic compounds in the waste liquid is extremely difficult after cooling. We employ a series of measures to prevent system blockage due to the viscosity of the organic compounds, ensuring the stable operation of the evaporation system.
Process Flow Description: Single-Effect Evaporation System Flow: The raw liquid first enters the preheating system and is preheated with the fresh steam condensate from the first-effect heater. The preheated material enters the evaporator system, where it is circulated and heated in the heating chamber by a circulating pump. Then, it undergoes evaporation and separation in the separator. The boiling vapor rises, while the concentrated liquid remains in the system. When the concentrated liquid concentration reaches the design value, it is discharged from the separator. The crystal slurry enters the thickener and then undergoes centrifuge separation to obtain solid products. The mother liquor is completely discharged.
Secondary Steam Process:
Heater Heat Source: External Saturated Fresh Steam
The secondary steam generated by evaporation carries a small amount of liquid droplets. This dirty secondary steam rises and enters the demister. Through countercurrent washing, the tiny liquid droplets entrained in the secondary steam are washed out and re-enter the feed liquid. The secondary steam, cleaned of mist, enters the steam side of the next-effect heater.
After heat exchange with the external saturated fresh steam, it condenses into water and goes to the preheater to preheat the raw materials.
The secondary steam enters the condenser for condensation.
System Automatic Control System:
The process control system of the single-effect evaporator crystallizer uses PLC and DCS to realize its process control and safe operation.
(1) Automatic start-up and shutdown control of the single-effect evaporator crystallizer;
(2) Automatic adjustment of process parameters of the single-effect evaporator crystallizer;
(3) Interlock protection of the single-effect evaporator crystallizer;
(4) Detection and alarm of process parameters of the single-effect evaporator crystallizer;
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