Viscous oil wastewater pretreatment and evaporation desalting system and method

A heavy oil wastewater and pretreatment technology, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of high difficulty, temperature, organic matter, high salt content, structure Scale tendency and other issues

Active Publication Date: 2014-12-03
XIAN THERMAL POWER RES INST CO LTD +2
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Problems solved by technology

Due to the complex water quality of heavy oil wastewater, high temperature, organic matter, salt content, etc., and stron

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  • Viscous oil wastewater pretreatment and evaporation desalting system and method
  • Viscous oil wastewater pretreatment and evaporation desalting system and method

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0022] see figure 1 The heavy oil wastewater pretreatment and evaporative desalination system of the present invention comprises a heavy oil wastewater pool 1 and a flash evaporator 2 connected to the heavy oil wastewater pool 1, the steam outlet of the flash evaporator 2 and the first effect evaporator of the falling film evaporator 8 Connected, the liquid outlet is connected to the two-stage reaction clarification system, and the two-stage reaction clarification system is composed of a primary reactor 3, a primary clarifier 4, a secondary reactor 5 and a secondary clarifier 6, and the primary reactor 3 There is a first dosing port for adding silicon removal chemicals; a second dosing port for adding descaling chemicals is provided on the secondary reactor 5; the primary reactor 3 is connected with the primary clarifier 4, and the primary clarification The ...

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Abstract

The invention relates to a viscous oil wastewater pretreatment and evaporation desalting system and method. A two-stage chemical reaction settling pretreatment system is arranged before an evaporator to effectively remove silicon dioxide and hardness in viscous oil wastewater, a high-temperature scale inhibitor is matched to prevent the heat transfer surface of the evaporator from scaling, so that the evaporator can stably operate for a long time; and concentrated water discharged by the evaporator is naturally evaporated by an evaporation pond to implement zero wastewater discharge of the process system. An evaporation technique is adopted to fully utilize heat energy in the high-temperature viscous oil wastewater, so that the salt content and organic matter content in the condensation water generated by the falling film evaporator are obviously lowered; and the condensation water can be used as station boiler make-up water after being subjected to subsequent organic matter removal and deep desalting treatment. Besides, the two-stage chemical reaction is adopted to remove the silicon dioxide and hardness in the viscous oil wastewater, and the scale inhibitor is combined to prevent the heat transfer surface of the evaporator from scaling, so that the salt content in the condensation water of the evaporator is low, thereby achieving the goal of pre-desalting viscous oil wastewater.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment and resource recycling, and in particular relates to a heavy oil wastewater pretreatment and evaporation desalination system and method. Background technique [0002] my country is rich in heavy oil resources, mainly distributed in Shengli, Liaohe, Henan, Xinjiang and other oil fields. Due to the high viscosity and poor fluidity of heavy oil, it is necessary to use a large amount of high-pressure, high-dryness steam to heat the oil layer in the process of heavy oil production, so as to improve its fluidity and make it easy to produce. During the thermal recovery of heavy oil using steam, a large amount of high-temperature, high-salt, high-silicon, and high-organic heavy oil waste water needs to be disposed of. At present, the conventional technology is to degrease and soften the heavy oil wastewater to meet the "Steam Injection Boiler Feed Water Quality Index" in the "Code...

Claims

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Application Information

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IPC IPC(8): C02F9/10
Inventor 王璟蒲平毛进杨宝红郭维忠李亚娟王正江许臻王金磊刘亚鹏
Owner XIAN THERMAL POWER RES INST CO LTD
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