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Terminal wastewater zero discharging system and method of power plant

A zero-discharge, wastewater technology, applied in separation methods, chemical instruments and methods, gaseous discharge wastewater treatment, etc., can solve the problems of scarcity of power plants, high investment costs, and high water treatment costs per ton

Active Publication Date: 2017-05-10
SHENGFA ENVIRONMENT PROTECTION TECH XIAMEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology has high equipment investment costs, high operating costs, high energy consumption, and high cost per ton of water treatment. The number of power plants that use this technology for desulfurization wastewater treatment in the world is scarce and has not been widely promoted.

Method used

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  • Terminal wastewater zero discharging system and method of power plant
  • Terminal wastewater zero discharging system and method of power plant
  • Terminal wastewater zero discharging system and method of power plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] refer to Figure 1 to Figure 4 As shown, the certain thermal power plant adopted in the present embodiment 1, the various ion concentrations in the desulfurization wastewater of the power plant are representative in the operation of other power plants. That

[0073] (1) The pH range is 5-7, showing weak acidity,

[0074] (2) Water quality of desulfurization wastewater, suspended matter content 350000~50000mg / L

[0075] (3)Ca 2+ The ion content is 500~2000mg / L, Mg 2+ The ion content is 5000~10000mg / L

[0076] (4) Desulfurization wastewater contains a large amount of chloride ions,

[0077] (5) Desulfurization wastewater contains a large amount of metal ions, such as chromium, cadmium, mercury, arsenic, lead, etc.

[0078] (6) Desulfurization wastewater has high salinity,

[0079] The above-mentioned desulfurization wastewater is passed through the chemical water concentrated water collection system, the fine treatment regeneration wastewater collection system and ...

Embodiment 2

[0088] The chemical water concentrated water in the chemical water concentrated water collection tank of the chemical water concentrated water collection system is detected by the first online conductivity measuring instrument. When the conductivity is lower than 15000us / cm, the chemical water concentrated water of the chemical water concentrated water collection system Return to the desulfurization island;

[0089] When the conductivity is higher than 30000us / cm, the concentrated water of the chemical water concentrated water collection system is introduced into the terminal waste water collection tank;

[0090] When the conductivity is 25000us / cm, the first online conductivity measuring instrument 14 sends a third control signal to the diverter valve, the diverter valve is automatically opened, and 20% of the concentrated water of the chemical water returns to the desulfurization island; 80% of the concentrated water of the chemical water enters the Terminal wastewater colle...

Embodiment 3

[0096] The chemical water concentrated water in the chemical water concentrated water collection tank of the chemical water concentrated water collection system is detected by the first online conductivity measuring instrument. When the conductivity is lower than 20000us / cm, the chemical water concentrated water of the chemical water concentrated water collection system Return to the desulfurization island;

[0097] When the conductivity is higher than 30000us / cm, the concentrated water of the chemical water concentrated water collection system is introduced into the terminal waste water collection tank;

[0098] When the conductivity is 25000us / cm, the first online conductivity measuring instrument 14 sends a third control signal to the diverter valve, the diverter valve is automatically opened, and 50% of the concentrated water of the chemical water returns to the desulfurization island; 50% of the concentrated water of the chemical water enters the Terminal wastewater colle...

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Abstract

The invention relates to a system. The system comprises a terminal wastewater collection system, a pretreatment system and a rear smoke channel bypass evaporator, wherein the terminal wastewater collection system comprises a concentrated chemical water collection system, a refining regeneration wastewater collection system, and a desulfurizing wastewater collection system. In the pretreatment process, softening, flocculation and clarification are adopted to decrease the scaling ion concentration of calcium, magnesium, sulfate radical and the like in water, and removing SS (suspension) in the wastewater; sending the pretreated wastewater into the rear smoke channel bypass evaporator; evaporating by the heat of the rear smoke channel fume of a boiler; after completely evaporating, sending a crystallizing matter into a deduster, and discharging along with fly ash; sending gaseous water vapor and flume into a desulfurizing adsorbing tower via the deduster, condensing, and recycling, so as to realize the terminal wastewater zero discharging of a power plant.

Description

technical field [0001] The invention relates to the technical field of waste water treatment in thermal power plants, in particular to a zero discharge system and method for waste water at the end of a power plant. Background technique [0002] In recent years, with the rapid development of the economy and the aggravation of water pollution, the problem of lack of water resources has become more and more prominent, which has seriously restricted the sustainable development of the economy. In order to strictly limit the discharge standards of various types of wastewater and the total amount of wastewater discharge. On April 16, 2015, the State Council issued the "Water Pollution Action Plan" ("Water Ten Measures"). The state will strengthen the control of various types of water pollution, propose the most stringent source protection and ecological restoration system, and comprehensively control pollutant discharge , focus on saving and protecting water resources, and make ev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04B01D53/78B01D53/50C02F1/04C02F1/24C02F1/38C02F1/44C02F1/66C02F103/18C02F1/00
Inventor 刘其彬马明军
Owner SHENGFA ENVIRONMENT PROTECTION TECH XIAMEN CO LTD
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