High-salt wastewater treatment method

A waste water treatment, high salt content technology, applied in the direction of heating water/sewage treatment, etc., can solve the problems of large floor space and operating costs, high requirements and price comparison, waste of investment, etc., to increase air moisture absorption capacity and increase temperature , Improve the effect of evaporation capacity

Pending Publication Date: 2020-03-27
CHENGDU EN SHAIN TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the equipment investment of MVR technology is wasteful, the area occupied and the operating cost are relatively large. In addition, the equipment installation is relatively cumbersome, and the requirements for oil and gas field wastewater are relatively high.

Method used

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Examples

Experimental program
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Embodiment

[0029] like Figure 1~4 As shown, this embodiment discloses a high-salt wastewater treatment method that forms nine stages of evaporation when n=9. This embodiment includes nine evaporation tanks 1, overflow pipes 4, raw material liquid pipes 21, and heaters 2 , Water collection pipe 8, water production pipe 9, main air collection pipe 5, first auxiliary air collection pipe 6, first outlet 16, second feed port 14, third heat exchanger 10. Specifically, the system consists of nine evaporation tanks connected in series to form a nine-stage evaporation system. The nine evaporation tanks can be connected in series from top to bottom, and from top to bottom are the first-stage evaporation tank, the second-stage evaporation tank and The third-stage evaporation tank is connected in series on the first floor, the fourth-stage evaporation tank, the fifth-stage evaporation tank and the sixth-stage evaporation tank are connected in series on the second floor, the seventh-stage evaporatio...

example 1

[0049] For the treatment of fracturing flowback fluid at a well site in Ordos, Inner Mongolia, there are 9 evaporation water tanks in the evaporation concentration system used at this time, forming a 9-stage evaporation concentration system. First, the raw material liquid is obtained by removing fine particles such as suspended solids in the raw material liquid through flocculation and sedimentation treatment of the flowback liquid, and the raw material liquid is pumped into the first-stage evaporation water tank in the 9-stage evaporation concentration system through the raw material liquid, and the heating temperature is set After the temperature gradient at each level is formed (the first level is 90°C, followed by 85°C, 80°C, 75°C, 70°C, 65°C, 60°C, 55°C, 50°C), the membrane aeration fan is turned on and passes through the trachea to the Air is introduced into the aeration membrane module for evaporation treatment. During the evaporation process, the condensed water produce...

example 2

[0051]For the fracturing flowback fluid treatment of a shale gas drilling platform in Dazu, Chongqing, there are 6 evaporation water tanks in the evaporation concentration system used at this time, forming a 6-stage evaporation concentration system. First, the suspended matter in the raw material liquid is removed by flocculation and sedimentation of the flowback liquid, and the raw material liquid is pumped into the first-stage evaporation water tank in the 6-stage evaporation concentration system through the raw material liquid, and the heating temperature is set, and the temperature gradient of each level is After formation (the first stage is 90°C, followed by 85°C, 80°C, 75°C, 70°C, 65°C) the membrane aeration fan is turned on and the air is passed into the aeration membrane module through the air pipe for evaporation treatment. The condensed water produced by the phase change in the heat exchanger during the evaporation process is discharged into the water production tank...

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Abstract

The invention discloses a high-salt wastewater treatment method. Raw material liquid is subjected to n-stage continuous evaporation and concentration to generate condensed water and crystalline salt is separated in an n-th stage in a saturated manner, in the first-stage evaporation and concentration, a heater is used for heating feed liquid to 80-100 DEG C, in the second-stage evaporation and concentration, the high temperature of the fed feed liquid is used for further evaporation and concentration, in an mth-stage evaporation and concentration, heat generated by the phase change of water vapor generated in an (m-2)th-stage evaporation and concentration process is used as a heat source for main heating, the evaporated and concentrated feed liquid flows into an (m-1)th stage from the (m-2)th stage, condensate water generated by phase change of water vapor in the evaporation and concentration processes from the third stage to an nth stage is discharged as produced water, water vapor generated in the evaporation and concentration processes of an (n-1)th stage and the nth stage is discharged, m is larger than or equal to 3 and smaller than or equal to n, and n is larger than or equalto 6 and smaller than or equal to 20. The raw material liquid is preheated, so that the time for heating the feed liquid in the first stage to a set temperature is shortened, the feed liquid in the mth stage is heated by the water vapor generated in the (m-2)th stage evaporation and concentration process, and the waste of energy sources is avoided.

Description

technical field [0001] The invention relates to a method for treating saline wastewater, in particular to a method for treating high-saline wastewater. Background technique [0002] In the process of oil and gas exploration and development, oil and gas fields need to add a variety of substances during the development process, resulting in three types of wastewater with complex components and high salt content: drilling wastewater, fracturing flowback fluid, and gas field produced water, collectively referred to as Oil and gas field wastewater. The main characteristics of oil and gas field wastewater are high COD, high suspended solids, and high salinity. This type of wastewater is refractory to high-salt organic wastewater. If it is discharged directly without treatment, it will cause many environmental hazards. A hot spot and difficulty in wastewater research. [0003] Mechanical Vapor Recompression (MVR) evaporator, which uses the secondary steam generated by high-energy...

Claims

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Application Information

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IPC IPC(8): C02F1/04
CPCC02F1/04
Inventor 冯海波张延辉陈西亮吴华
Owner CHENGDU EN SHAIN TECH INC
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