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A device system for treating desulfurization wastewater by utilizing waste heat of flue gas from a power plant

A technology for desulfurization wastewater and flue gas waste heat, which is applied in gaseous effluent wastewater treatment, water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problems of high energy consumption, large equipment footprint and complicated operation. , to achieve the effect of low operating cost, small footprint, simple and easy operation

Active Publication Date: 2021-06-01
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems of large energy consumption, complex operation, and large equipment footprint in existing desulfurization wastewater treatment devices, the purpose of the present invention is to provide a device for treating desulfurization wastewater using waste heat from power plant flue gas and a drying method thereof. The invented device has a small footprint, simple operation process, and secondary recovery and utilization of the heat of the power plant flue gas, low energy consumption, and maximizes environmental protection and economic benefits

Method used

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  • A device system for treating desulfurization wastewater by utilizing waste heat of flue gas from a power plant
  • A device system for treating desulfurization wastewater by utilizing waste heat of flue gas from a power plant

Examples

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Effect test

Embodiment 1

[0034] Embodiment 1: Select the power plant desulfurization wastewater with a moisture content of 95% on a wet basis, feed through the feed device 12 with a feed rate of 1000 kg / h, and the air volume provided by the wind supply device 11 is 2.1 × 10 4 m 3 / h, the inlet air temperature is 300°C; the drying effect of the material is good, the product is collected under the solid recovery tank 8, and the outlet air temperature at the electrostatic precipitator 10 is measured to be about 85°C, and the average moisture content of the product is 3%.

[0035] The specific process is as follows: first close the control valve on the connecting pipeline between the wind supply device 11 and the electrostatic precipitator 10, open the wind supply device 11, and the flow rate of the flue gas sucked into the power plant by the hot flue gas inlet e is 2.1×10 4 m 3 / h (the temperature of the flue gas in the power plant is 300°C), the flow rate to the first air inlet 7 is controlled to be 1...

Embodiment 2

[0036] Embodiment 2: Select the power plant desulfurization wastewater with a moisture content of 95% on a wet basis, feed through the feed device 12 with a feed rate of 500 kg / h, and the air volume provided by the wind supply device 11 is 1.6 × 10 4 m 3 / h, the air inlet temperature of the air supply device is 300°C; the drying effect of the material is good, the product is collected under the electrostatic precipitator, and the outlet air temperature at 10 of the electrostatic precipitator is measured to be about 150°C, and the average moisture content of the product on a wet basis is 2%.

[0037] The specific process is as follows: first close the control valve on the connecting pipeline between the wind supply device 11 and the electrostatic precipitator 10, open the wind supply device 11, and the flow rate of the flue gas sucked into the power plant by the hot flue gas inlet e is 1.6×10 4 m 3 / h (the temperature of the flue gas in the power plant is 300°C), the flow ra...

Embodiment 3

[0038] Embodiment 3: Select the power plant desulfurization wastewater with a moisture content of 95% on a wet basis, feed through the feed device 12 with a feed rate of 40kg / h, and the air volume provided by the wind supply device 11 is 2.0 × 10 3 m 3 / h, the air inlet temperature of the air supply device 11 is 300°C; the drying effect of the material is good, the product is collected under the electrostatic precipitator, and the outlet air temperature of the electrostatic precipitator 10 is measured to be about 200°C, and the average moisture content of the product on a wet basis is 2%. )

[0039] The specific process is as follows: first close the control valve on the connecting pipeline between the wind supply device 11 and the electrostatic precipitator 10, open the wind supply device 11, and the flow rate of the flue gas sucked into the power plant by the hot flue gas inlet e is 2.0×10 3 m 3 / h (the temperature of the flue gas in the power plant is 300°C), the flow ra...

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Abstract

The invention relates to a device system for treating desulfurization wastewater by using waste heat of flue gas from a power plant, which includes an inert particle drying chamber, an air supply device, a feeding device, and a gas-solid separation device; Distributed in a fluidized bed, spray coated on the surface of inert particles, and exchange heat and mass with the hot flue gas blown in from the bottom and side of the inert particle drying chamber to remove moisture. After the solid materials in the desulfurization wastewater collide and fall off, containing Part of the waste gas is discharged and reused by the power plant, and part of it is mixed with hot flue gas and circulated into the inert particle drying chamber. The invention solves the shortcomings of the traditional wastewater treatment device, such as large occupied area, complicated operation, low reliability, and low economical efficiency, rationally reutilizes the waste heat of the flue gas of the power plant, and improves the drying capacity and reliability of the fluidized bed.

Description

technical field [0001] The invention belongs to the technical field of drying equipment, and in particular relates to a device for utilizing the residual heat treatment of flue gas in a power plant for desulfurization wastewater and a drying method thereof. Background technique [0002] Limestone-gypsum wet desulfurization is often used in power plants in my country, and the solid gypsum produced can be reused. However, the desulfurization wastewater produced is highly acidic and contains a large amount of suspended solids and metals. The water quality is poor and cannot be directly discharged and needs to be treated. [0003] As the country attaches great importance to atmospheric and water environmental protection, the discharge standards for industrial wastewater have gradually increased, and the zero-discharge technology of wastewater has received attention in related fields. Coal-fired power plants consume a lot of water. How to treat power plant desulfurization wastewat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/16C02F103/18
CPCC02F1/16C02F2103/18
Inventor 杨阿三李金程榕郑燕萍孙勤贾继宁李琰君屠美玲
Owner ZHEJIANG UNIV OF TECH
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