A dioxolan section wastewater treatment device in a polyformaldehyde production system
CN224691865UActive Publication Date: 2026-08-28HENAN XINLIANXIN FERTILIZER
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Patent Information
- Application Number
- CN202521544162.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-22
- Publication Date
- 2026-08-28
- Estimated Expiration
- 2035-07-22
AI Technical Summary
Technical Problem
[0002]传统的聚甲醛生产系统中包含有二氧五环生产流程，在二氧五环生产流程中，来自萃取塔塔底的氢氧化钠水溶液和倾析器下部间歇排放废碱液一般进入暂存储罐内，后续暂存储罐中的废碱液送入聚甲醛产出的废水中进行中和，最终送入污水处理系统中进行处理后达标排放；在实际污水处理过程中发现污水处理过程较慢，且污水处理经常不达标；进一步地分析发现，暂存储罐中的废碱液量较大，经过分析废水中含盐量较高，含盐量为20930ppm(而装置流程的设置含盐量为8000ppm)；由于含盐量较高会抑制细菌细胞，造成污泥活性低以及污水处理不达标的现象，同时对聚甲醛及污水处理温度运行产生较大影响
Benefits of technology
[0007]本实用新型的有益效果为：通过设置碱液再生蒸发器能够对废碱液进行气液分离，该气液分离是利用碱液再生蒸发器中的热源对废碱液进行加热蒸发，其能够对液相进行浓缩以实现回收再利用，进一步的对气相冷凝后的液相进行污水处理，从而使进入污水处理系统中的污水量大大减少，并且有效的降低了含盐量(含盐量降低至7500ppm左右)，从而实现了污水处理系统正常运行，以及的污水达标排放；本实用新型中所述的气相冷凝单元不仅能够使气相冷凝为液相，为后续的污水处理奠定基础；同时还能够对冷凝后气相中的甲醛实现回收再利用。
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Abstract
The utility model belongs to a kind of dioxolane section wastewater treatment device in polyformaldehyde production system;Including extraction column and decanter in dioxolane section, and the liquid phase outlet of extraction column bottom and the waste lye outlet of decanter are connected with recovery liquid alkali storage tank respectively, recovery liquid alkali storage tank is connected with the import of lye regeneration evaporator, the gas phase outlet of lye regeneration evaporator is connected with gas phase condensing unit, the gas phase outlet of gas phase condensing unit is connected with the secondary concentration washing tower import of formaldehyde concentration section, the liquid phase outlet of gas phase condensing unit is connected with waste liquid storage tank, the liquid phase outlet of waste liquid storage tank is connected with sewage treatment system, the phase outlet of waste liquid storage tank is connected with the primary concentration washing tower import of formaldehyde concentration section;With the advantages of environmental friendly, energy saving and cost reduction and reduce operating cost.
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