Device and method for active carbon flue gas desulphurization and production of dilute sulphuric acid

A technology of activated carbon and dilute sulfuric acid, applied in separation methods, chemical instruments and methods, sulfur compounds, etc., can solve the problems of large footprint, cumbersome operation, and high investment, and achieve flue gas desulfurization operations in continuous towers, high mass transfer Effect, effect of rapid desulfurization process

Inactive Publication Date: 2015-05-13
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] Although the whole desulfurization process can realize the continuous operation of flue gas desulfurization, but the whole operation process is realized through the rotation switching of the two towers, the operation is cumbersome, the filling amount of activated carbon is large, the floor area is large, the investment is high, and the failure rate is high

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  • Device and method for active carbon flue gas desulphurization and production of dilute sulphuric acid

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Effect test

Embodiment 1

[0042] A device for activated carbon flue gas desulfurization and production of dilute sulfuric acid, which has two activated carbon absorption and elution devices, using spherical activated carbon with a diameter of 4-8mm or hollow spherical activated carbon with a diameter of 8-20mm as the desulfurizer; each layer of activated carbon in the filling layer The height of the static layer is 500mm, the height of the fluidized zone is 1000mm, the flow rate of the flue gas is 2.5~6m / s; the density of the spray liquid of the absorption liquid in the tower is 20~40m 3 / m 2 ·h; single-layer packed bed resistance 800~1500Pa; SO treatment 2 For flue gas whose concentration is less than 1%, the flue gas concentration at the tower outlet is ≤400mg / Nm 3 . Due to the severe turbulence and large wear in the fluidized area, the shape of the activated carbon is designed as a spherical shape with better fluidity. In order to maintain the desulfurization reaction temperature, the washing liqu...

Embodiment 2

[0044] Roasting flue gas (SO 2 Concentration 3%) After sulfuric acid is produced through the one-turn-one-suction process, the tail gas contains SO 2 Concentration up to 3000mg / Nm 3 , using this device to desulfurize flue gas and produce dilute sulfuric acid at the same time. The flue gas at 80°C enters the desulfurization tower, and there are two filling layers in the tower. Under the action of spherical activated carbon flue gas and spray liquid, it turbulently churns in the fluidization area. The sulfur dioxide in the flue gas is quickly absorbed, oxidized into sulfuric acid and then enters the Liquid phase spray liquid, the SO in the flue gas after the flue gas is desulfurized by two layers of activated carbon 2 Concentration down to 350mg / Nm 3, up to the emission standard. Sulfuric acid is continuously accumulated in the spray liquid, and when the concentration of dilute sulfuric acid reaches the specified concentration (according to user requirements, generally less ...

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Abstract

The invention relates to a device and method for active carbon flue gas desulphurization and production of dilute sulphuric acid, and the device is characterized by including a device casing, a foam collecting device located at the upper part of the device casing, an active carbon absorption and elution device located at the middle of the device casing, and a flue gas inlet pipe located at the lower part of the device casing. Spherical active carbon is used as a desulfurization agent, flue gas flows in from the bottom of a the tower, the active carbon is in the fluidized state, spray liquid (dilute sulfuric acid or clear water) and the spherical active carbon are contacted, active carbon desulfurization product sulfuric acid is taken away, and active carbon surface activity is recovered, so that active carbon regeneration rate is also greatly accelerated so as to achieve the continuous operation of flue gas desulfurization. Single column continuous operation is feasible, active carbon filling amount is small, occupation area is small, primary investment is less, and the failure rate is low.

Description

technical field [0001] The invention relates to a device and method for desulfurizing activated carbon flue gas and producing dilute sulfuric acid. technical background [0002] Because activated carbon has adsorption function. SO in flue gas 2 After being adsorbed by activated carbon, it reacts with water vapor and oxygen in the flue gas at 60-150°C to produce sulfuric acid: [0003] SO 2 +H 2 O+O 2 =H 2 SO 4 [0004] After the adsorption of activated carbon is saturated, the activity decreases. After the dilute sulfuric acid on the surface of the desulfurizer is sprayed and rinsed with water, the activated carbon will recover its activity and can be recycled. [0005] Therefore, activated carbon can be used as a desulfurization agent for flue gas desulfurization and recycled, and sulfur dioxide can be recovered in the form of sulfuric acid. [0006] At present, the devices for activated carbon desulfurization technology are fixed-bed reactors and activated carbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/74B01D53/50C01B17/76
Inventor 李大江郭持皓常耀超孙留根梁东东李云
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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