A method and system for zero discharge of waste water in the whole plant

A zero-discharge, waste water technology, applied in the direction of separation methods, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problem of intermixed and discontinuous large flow drainage, high equipment investment and operating costs, high salt waste water Dealing with Difficulties etc.

Active Publication Date: 2018-01-23
CHENGDU RAISE ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Application Information

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Problems solved by technology

[0002] Enterprises using boilers such as thermal power plants and industrial kilns discharge various types of wastewater such as circulating water sewage, industrial wastewater, coal-containing wastewater, oil-containing wastewater, and domestic wastewater. Discontinuous large-flow drainage, especially the treatment of some high-salt wastewater is difficult, and at the same time, the realization of zero discharge of large-volume wastewater requires a large equipment footprint, high equipment investment and operating costs

Method used

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  • A method and system for zero discharge of waste water in the whole plant
  • A method and system for zero discharge of waste water in the whole plant
  • A method and system for zero discharge of waste water in the whole plant

Examples

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Embodiment 1

[0047] Such as figure 1 , figure 2 As shown, a method for zero discharge of waste water in the whole plant includes the following steps:

[0048] S1. The wastewater of the whole plant enters the wastewater collection device 1;

[0049] S2. The waste water enters the flue gas wet desulfurization device 2 from the waste water collection device 1;

[0050] S3. The high-temperature dry flue gas enters the flue gas wet desulfurization device 2;

[0051] S4. High-temperature dry flue gas and waste water are in heat exchange contact in the wet flue gas desulfurization device 2, and part of the water in the waste water evaporates to humidify the flue gas and is discharged from the top of the wet flue gas desulfurization device 2; Water accounts for 60-80% of the total amount of raw wastewater;

[0052] S5. The waste water is concentrated after being in contact with the hot flue gas, and discharged together with the desulfurization waste water from the flue gas wet desulfurization...

Embodiment 2

[0068] A method for zero discharge of waste water in the whole plant, such as Image 6 , Figure 7 As shown, its steps are the same as the method for zero discharge of whole plant waste water described in Example 1, and the difference with the method for zero discharge of whole plant waste water described in Example 1 is that in described step S2, after the waste water is collected from the waste water collection device 1 Before entering the wet flue gas desulfurization device 2, it also includes the step of pretreating the wastewater in the wastewater collection device 1, and then leading the pretreated wastewater into the wet flue gas desulfurization device 2. Through the wastewater pretreatment step, part of the water can be recycled and utilized to achieve the purpose of pre-reduction of wastewater cascade utilization, and the remaining concentrated water that cannot be treated enters the flue gas wet desulfurization device 2 . For example, in the pretreatment step, RO re...

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Abstract

The invention discloses a method for zero discharge of waste water in the whole plant. The waste water of the whole plant is collected by a waste water collection device (1) and then introduced into a flue gas wet desulfurization device (2). High-temperature dry smoke heat exchange contact, part of the water in the wastewater evaporates to humidify the flue gas and is discharged from the top of the flue gas wet desulfurization device (2); the concentrated wastewater is discharged from the flue gas wet desulfurization device (2) together with the desulfurization wastewater. Also disclosed is a system adopting the method for zero discharge of waste water in the whole plant, including a waste water collection device (1), a flue gas wet desulfurization device (2) and a desulfurization waste water zero discharge device (3) connected in sequence. The beneficial effects of the present invention are: using the high-temperature flue gas in the flue gas wet desulfurization device to evaporate and reduce the original large amount of wastewater, so as to realize the heat utilization of the waste high-temperature flue gas and reduce the amount of wastewater treated by the zero-emission device, As a result, the land occupation, investment and operating costs of the desulfurization wastewater zero discharge device are all low.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method and system suitable for zero discharge of wastewater in thermal power plants, industrial kilns and other enterprises. Background technique [0002] Thermal power plants, industrial kilns and other enterprises that use boilers discharge various waste water such as circulating water sewage, industrial waste water, coal-containing waste water, oily waste water, and domestic waste water. Discontinuous large-flow drainage, especially some high-salt wastewater is difficult to treat. At the same time, the realization of zero discharge of large-volume wastewater requires a large equipment footprint, high equipment investment and operating costs. [0003] Enterprises using boilers such as thermal power plants and industrial kilns have built flue gas desulfurization devices under the domestic "Eleventh Five-Year" environmental protection requirements, of which wet flu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/16C02F9/10B01D53/78B01D53/48
Inventor 郑伟高燎
Owner CHENGDU RAISE ENVIRONMENTAL PROTECTION TECH CO LTD
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