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A zero-discharge system for desulfurization wastewater

A desulfurization wastewater, zero-discharge technology, applied in gaseous discharge wastewater treatment, water/sewage treatment, water/sludge/sewage treatment, etc. The problem of high operating cost is to achieve the effect of low overall operating cost, safe and reliable system operation, and less impact on boiler efficiency.

Active Publication Date: 2021-07-13
SHENGFA ENVIRONMENT PROTECTION TECH XIAMEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the current project plan has basically achieved the goal of zero discharge of desulfurization wastewater, there are still many problems, such as complex process flow, the need to add a large number of new equipment and facilities, large investment, high operating costs, and insufficient water quality and quantity for the three-stage process. Coordination and other issues

Method used

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  • A zero-discharge system for desulfurization wastewater
  • A zero-discharge system for desulfurization wastewater
  • A zero-discharge system for desulfurization wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0030] see figure 1 , image 3 and Figure 4 As shown, a zero-discharge system for desulfurization wastewater in this embodiment includes a fan 1, a condenser 2, a heat exchanger 3, an evaporative dryer 4, a gas-solid separator 5, and a pneumatic ash conveying device 6. The fan 1 Connected to the condenser 2, the fan 1 introduces air into the condenser 2 for primary heating, the air is heated and enters the heat exchanger 3, the heat exchanger 3 is connected to the flue between the SCR7 and the air preheater 8, and the heat exchanger 3 Use the heat of the flue gas after denitrification to heat the air twice, and heat the air temperature to above 280°C to form hot air. The hot air enters the evaporative dryer 4, and the desulfurization wastewater is introduced into the atomization in the evaporative dryer 4, and heated The exhausted air is subjected to heat exchange, and the atomized desulfurization wastewater is quickly evaporated to dryness, and enters the gas-solid separat...

Embodiment 2

[0039] see figure 2 , image 3 and Figure 4 As shown, the difference between the system structure of the present embodiment 2 and the embodiment 1 is that the present embodiment 2 does not have the heat exchanger 3, but introduces the secondary air of the air preheater 8 into the evaporative dryer 4, The secondary air, the hot air entering the condenser 2, and the heated air are mixed with the inlet air of the blower 1 and then enter the air preheater 8 to make full use of the remaining heat to recycle the desulfurization wastewater and realize zero discharge of desulfurization wastewater.

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Abstract

The present invention relates to the technical field of power plant wastewater treatment, in particular to a zero-discharge system for desulfurization wastewater. A fan 1 introduces air into a condenser 2 for primary heating. After the air is heated, it enters a heat exchanger 3. The heat exchanger 3 is connected between the SCR and the air. On the flue between the preheaters, the heat exchanger 3 uses the heat of the flue gas after denitrification to reheat the air, heating the air temperature to above 280°C to form hot air, and the hot air enters the evaporative dryer 4, where The desulfurization waste water is introduced into the atomization in the evaporative dryer 4 and exchanged heat with the heated air. The atomized desulfurization waste water evaporates quickly and enters the gas-solid separator 5 together with the hot air, and the outlet of the gas-solid separator 5 is heated. The air passes through the condenser 2 to heat the air at the inlet of the front-end heat exchanger 3. The condenser 2 condenses and recycles the desulfurization wastewater at the same time. The warm air generated by the condenser 2 is mixed with the inlet air of the blower 1 and enters the air preheater. The system of the invention is safe and reliable in operation, and the whole technological process is simple, the cost of equipment addition is low, and the operation cost is low.

Description

technical field [0001] The invention relates to the technical field of power plant wastewater treatment, in particular to a zero-discharge system for desulfurization wastewater. Background technique [0002] Most of the thermal power units in service and new thermal power units in China are equipped with flue gas desulfurization devices to ensure that the boiler flue gas discharges up to the standard. Among them, the wet limestone-gypsum wet desulfurization process is the most widely used. Due to its relatively low investment and operating costs, wet desulfurization technology is especially suitable for desulfurization equipment of large-scale units. It is a mature and efficient desulfurization process. [0003] At the same time, the process will have the problem of desulfurization wastewater treatment. This part of wastewater is high-salinity, high-hardness wastewater with poor water quality and a large amount of impurities, such as calcium and magnesium ions, suspended s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/12C02F1/16C02F103/18
CPCC02F1/043C02F1/12C02F1/16C02F2103/18
Inventor 刘其彬万忠诚马明军赵飞刘亚许伟鸿
Owner SHENGFA ENVIRONMENT PROTECTION TECH XIAMEN CO LTD