Process and system for treating power plant wastewater

A technology of treatment process and treatment system, which is applied in the field of treatment process and treatment system of power plant wastewater to achieve the effects of saving water resources, reducing consumption and improving recovery rate

Inactive Publication Date: 2017-09-15
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The main purpose of this application is to provide a treatment process and system for power plant wastewater to alleviate the problem of sewage caused by power plant wastewater discharge

Method used

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  • Process and system for treating power plant wastewater
  • Process and system for treating power plant wastewater

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Embodiment

[0053] A 2×300MW coal gangue power generation project adopts a circulating fluidized bed boiler and a direct air-cooled steam turbine generator set. h of waste water needs to be treated for reuse. use figure 2 The treatment system shown is for wastewater treatment. The treatment system also includes wastewater collection equipment and lift pumps. Among them, the lime softening equipment is a high-density pool. The specific treatment process includes:

[0054] Collect the waste water into the waste water collection equipment, and use the lift pump to pump the waste water to the high-density pool with built-in lime milk for lime softening;

[0055] The above-mentioned waste water after the lime softening enters into the sand filter device 21 through the softened water outlet of the above-mentioned lime softening device 1 to filter sand; the waste water after the sand filter enters the ultrafiltration device 22 through the filter liquid outlet for further filtration, and the pa...

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Abstract

The application provides a process and method for treating power plant wastewater. The process comprises the following steps: S1, performing lime softening on wastewater; S2, filtering the wastewater softened with lime to obtain filtrate; S3, performing sodium bed softening on the filtrate to obtain softened water; and S4, performing efficient reverse osmosis treatment on the softened water to obtain primary demineralized water. According to the method, the power plant wastewater is subjected to lime softening and sodium bed softening processes, Ca<2+>, Mg<2+> and other ions can be removed, hardness of wastewater can be reduced, and turbidity in water is reduced since wastewater is filtered, so that wastewater treated by the treatment process can reach the water quality index of primary demineralized water, and partial water can be utilized in households and production, and the aim of changing wastewater into available water can be achieved. Furthermore, the recycling rate of wastewater is improved to 90 percent by adopting efficient reverse osmosis treatment, the recycling rate of wastewater can be greatly improved, fresh water usage can be reduced, and the water resource can be saved.

Description

technical field [0001] The application relates to the field of chemical industry, in particular, to a treatment process and system for wastewater from a power plant. Background technique [0002] Most thermal power plants use groundwater or surface water with good water quality as raw water to prepare boiler make-up water, and a small number of power plants use urban reclaimed water as boiler make-up water. [0003] When using groundwater or surface water as raw water to prepare boiler feed water, the groundwater or surface water needs to go through a series of treatments before finally entering the boiler. There are two main processes, one is mechanical filtration + ultrafiltration + reverse osmosis + cation Exchanger + carbon removal + anion exchanger + mixed ion exchanger; the other is mechanical filtration + ultrafiltration + primary reverse osmosis + carbon remover + secondary reverse osmosis + EDI. [0004] When using urban reclaimed water to prepare boiler feed water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/02
CPCC02F1/001C02F1/20C02F1/42C02F1/441C02F1/66C02F5/06C02F9/00C02F2103/02C02F2301/08C02F2303/22Y02A20/131
Inventor 刘彩霞王爱胜
Owner CHINA SHENHUA ENERGY CO LTD
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