Device system for treating desulfurized wastewater by utilizing fume waste heat of power plant

Abstract

The invention relates to a device system for treating desulfurized wastewater by utilizing the fume waste heat of a power plant. The device system comprises an inert particle drying chamber, an air supply device, a feed device and a gas-solid separation device; the desulfurized wastewater of a power plant is pressurized into a liquid distributor through the feed device, is uniformly distributed ona fluidized bed, is sprayed and coated to the surface of inert particles, and performs heat and mass transfer with heat fume blowing from the bottom and side part of the inert particle drying chamberto remove moisture; after a solid material in the desulfurized wastewater is collided and falls down, partial residue-containing gas is emitted out and recycled by the power plant, and partial residue-containing gas is mixed with the heat fume to cyclically enter the inert particle drying chamber. The device system solves the defects of large floor area, complicated operation, low reliability, not remarkable economical efficiency and the like of a traditional wastewater treatment device, fume waste heat of a power plant can be reasonably recycled for the second time, and the drying performance and reliability of the fluidized bed can be improved.

Description

technical field

[0001] The invention belongs to the technical field of drying equipment, and in particular relates to a device and a drying method for treating desulfurization wastewater by utilizing waste heat of flue gas from a power plant. Background technique

[0002] Most power plants in my country use limestone-gypsum wet desulfurization, and the solid gypsum produced can be reused. The desulfurization wastewater produced is highly acidic, contains a large amount of suspended solids and metals, and has poor water quality. It cannot be discharged directly and needs to be treated.

[0003] As the country attaches great importance to the protection of the atmospheric environment and water environment, the discharge standards for industrial wastewater have gradually increased, and the zero-discharge technology of wastewater has been valued by related fields. Coal-fired power plants consume a lot of water. How to deal with desulfurization wastewater from power plants and imp...

Examples

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...

technical field

[0001] The invention belongs to the technical field of drying equipment, and in particular relates to a device and a drying method for treating desulfurization wastewater by utilizing waste heat of flue gas from a power plant. Background technique

[0002] Most power plants in my country use limestone-gypsum wet desulfurization, and the solid gypsum produced can be reused. The desulfurization wastewater produced is highly acidic, contains a large amount of suspended solids and metals, and has poor water quality. It cannot be discharged directly and needs to be treated.

[0003] As the country attaches great importance to the protection of the atmospheric environment and water environment, the discharge standards for industrial wastewater have gradually increased, and the zero-discharge technology of wastewater has been valued by related fields. Coal-fired power plants consume a lot of water. How to deal with desulfurization wastewater from power plants and imp...

Examples

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...

Images