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Synergistic gas-liquid-solid pollutant treatment system based on power plant wastewater zero-discharge technology

A power plant wastewater and collaborative treatment technology, applied in the direction of heating water/sewage treatment, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of system integration and coupling to be further improved, and achieve economical improvement Performance indicators and overall operating efficiency, improving integration, and optimizing the effect of operating status

Inactive Publication Date: 2016-09-28
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the invention patent combined and integrated the desulfurization, denitrification, dust removal and mercury removal unit processes, it did not effectively couple the desulfurization wastewater treatment and denitrification system ammonia injection, and the system integration still needs to be further improved

Method used

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  • Synergistic gas-liquid-solid pollutant treatment system based on power plant wastewater zero-discharge technology
  • Synergistic gas-liquid-solid pollutant treatment system based on power plant wastewater zero-discharge technology
  • Synergistic gas-liquid-solid pollutant treatment system based on power plant wastewater zero-discharge technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A coal-fired power plant is equipped with two 330MW coal-fired generating units. Under the operating condition of the two units running at the same time, and the average power generation load of the whole plant is close to 70% of the rated load, the average desulfurization wastewater discharged from the desulfurization system is 8.4t / h, boiler outlet NO x The average concentration is 600mg / m 3 (Standard state, dry basis, 6% oxygen), the SCR denitrification system is equipped with 3 layers of catalysts.

[0041] This embodiment system refers to figure 1 , will not be repeated, wherein, the SNCR nozzle 2 of each unit is a 3-layer spray gun, and each layer is provided with 9 spray guns, and the SCR nozzle 6 is a single-layer spray gun, and each unit is provided with 2 spray guns. In the specific operation process, most of the time only SNCR nozzle 2 works, while SCR nozzle 6 does not work, only when the NO x When the concentration rises rapidly, the SCR nozzle 6 is put...

Embodiment 2

[0048] A coal-fired power plant is equipped with two 350MW coal-fired generating units. Under the operating condition of the two units running at the same time, and the average power generation load of the whole plant is close to 75% of the rated load, the average desulfurization wastewater discharged from the desulfurization system is 10t / h, boiler outlet NO x The average concentration is 650mg / m 3 (Standard state, dry basis, 6% oxygen), the SCR denitrification system is equipped with 3 layers of catalysts.

[0049] This embodiment system refers to figure 1 , will not be repeated, wherein, the SNCR nozzle 2 of each unit is a 3-layer spray gun, and each layer is provided with 9 spray guns, and the SCR nozzle 6 is a single-layer spray gun, and each unit is provided with 2 spray guns. In the specific operation process, most of the time only SNCR nozzle 2 works, while SCR nozzle 6 does not work, only when the NO x When the concentration rises rapidly, the SCR nozzle 6 is put ...

Embodiment 3

[0056] A coal-fired power plant has two 660MW ultra-supercritical coal-fired units installed. When the two units are running at the same time and the average power generation load of the whole plant is close to 80% of the rated load, the average desulfurization wastewater discharged from the desulfurization system is 14t / h, boiler outlet NO x The average concentration is 550mg / m 3 (Standard state, dry basis, 6% oxygen), the SCR denitrification system only has 2 layers of catalysts.

[0057] This embodiment system refers to figure 1 , No need to repeat, wherein, the SNCR nozzle 2 of each unit is a 3-layer spray gun, and each layer is provided with 15 spray guns, and the SCR nozzle 6 is a single-layer spray gun, and each unit is provided with 4 spray guns. In the specific operation process, most of the time only SNCR nozzle 2 works, while SCR nozzle 6 does not work, only when the NO x When the concentration rises rapidly, the SCR nozzle 6 is put into operation as a supplement...

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Abstract

The invention provides a synergistic gas-liquid-solid pollutant treatment system based on a power plant wastewater zero-discharge technology and belongs to the technical field of coal-fired boiler pollutant control. The synergistic gas-liquid-solid pollutant treatment system includes a desulfurized wastewater zero-discharge treatment system, an SNCR + SCR united denitration system and a high-temperature electric dust removal system, wherein the desulfurized wastewater zero-discharge treatment system performs desulfurized wastewater pretreatment and pre-concentration, the SNCR + SCR united denitration system absorbs dissolved ammonia or urea of the treated desulfurized wastewater, uses the dissolved ammonia or urea as a reducing agent to be sprayed into an outlet of a boiler and a flue behind a coal economizer to complete denitration reaction, and the high-temperature electric dust removal system is arranged behind the coal economizer to collect and remove evaporated crystal substances of the wastewater. The synergistic gas-liquid-solid pollutant treatment system has excellent properties, is stable in process operation, achieves zero discharge of wastewater while achieving synergistic and coupled gas-liquid-solid pollutant treatment, reduces equipment investment by 10%-50% and the operation costs by 75%-90%, greatly reduces the equipment failure rate and maintains the working amount.

Description

technical field [0001] The invention belongs to the technical field of controlling air, waste water and solid pollutants discharged from coal-fired boilers, and relates to a gas-liquid-solid pollutant collaborative treatment system based on the technology of power plant waste water zero discharge. Specifically, the flue evaporation system and the flue gas denitrification system in the desulfurization wastewater zero discharge technology are combined to jointly treat gas, liquid and solid pollutants, so as to achieve the purpose of fully utilizing the waste heat of the flue and simplifying the treatment system. Background technique [0002] The power system is an important foundation for the development of the national economy, and my country's power source is still mainly based on coal-fired power generation. However, coal-fired power plants will continuously emit a large amount of gas, liquid and solid pollutants during operation, among which gaseous pollutants are represen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10B01D53/86B01D53/54B01D53/78B01D53/48B01D53/14B03C3/00C02F103/18
CPCB01D53/14B01D53/48B01D53/54B01D53/78B01D53/8621B03C3/00C02F1/08C02F1/44C02F1/52C02F1/66C02F5/00C02F9/00C02F2103/18
Inventor 董锐锋王卫军王锋涛吴文龙
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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