Conversion unit high ammonia nitrogen acid condensate pretreatment system and conversion unit high ammonia nitrogen acid condensate pretreatment method

Abstract

The invention belongs to the field of treatment of coal chemical wastewater and waste gas, and particularly relates to a conversion unit high ammonia nitrogen acid condensate pretreatment system and aconversion unit high ammonia nitrogen acid condensate pretreatment method. According to the present invention, a coal gasification conversion unit circulating water heat exchanger is replaced with adeineralized water heat exchanger, the deineralized water is used as a heat medium to recover heat and reduce the circulating water field load, the temperature of a steam stripping liquid at a separation tower inlet is raised to 100-138 DEG C, and acid condensate (containing high ammonia nitrogen) sewage wastewater is pretreated in the separation tower by using a steam-like steam stripping method,such that the dissolved gases (high ammonia nitrogen materials and the like) in the liquid phase are gasified and separated as much as possible; and the results show that the total amounts of the high ammonia nitrogen materials, the organic matters and the sulfur-containing compounds in the gas phase is greatly increased, and the liquid phase finally enters the a biochemical unit at a low total amount of less than 50 kg / h, such that the treatment load of the biochemical unit is achieved so as to ensure the standard discharge after the biochemical treatment.

Description

Technical field: [0001] The invention belongs to the field of coal chemical wastewater and waste gas treatment, and in particular relates to a pretreatment system and method for high ammonia nitrogen acidic condensate of a conversion unit. technical background: [0002] Ammonia nitrogen wastewater has great harm to the natural environment and human body. The main hazards of ammonia nitrogen pollution are: disturbing the normal balance of dissolved oxygen in the water body and further deteriorating the water quality; affecting the water quality of the water source and increasing the burden of water treatment; accelerating the eutrophication process of the water body. [0003] The treatment of high ammonia nitrogen wastewater is an urgent problem for enterprises to solve. According to the concentration difference, ammonia nitrogen wastewater is divided into 3 categories: (1) High concentration ammonia nitrogen wastewater: NH 3 -N>500mg / L; (2) Medium concentration ammonia ...

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Problems solved by technology

[0007] The patent (ZL 200910098944.6) discloses a stripping method of process condensate in CO conversion. In order to solve the problem of ammonium salt crystallization blockage in the conversion process condensate stripping system, two stripping towers are used to separate CO 2 and NH 3 stripping, avoiding CO 2 and NH 3 The possibility of simultaneous existence in the system prolongs the period of stable operation of the conversion device, but it does not fundamentally solve the problems of pipeline and equipment blockage and corrosion

[0008] However, the solutions of the above patents all solve the problem by adding a stripping tower. The two-tower process not only increases the complexity and uncontrollability of the process, but also greatly increases the cost and occupies the site.

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