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Sintering flue gas treatment method

A technology for sintering flue gas and treatment method, which is applied in the directions of gas treatment, separation method, chemical instrument and method, etc., can solve the problems of not having good desulfurization effect at the same time, and easy treatment of desulfurization products.

Pending Publication Date: 2021-02-09
BEIJING SHOUGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a treatment method for sintering flue gas to solve the technical problems in the prior art that both a good desulfurization effect and an easy-to-handle desulfurization product cannot be achieved at the same time

Method used

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  • Sintering flue gas treatment method

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preparation example Construction

[0054] The preparation device for atomized ammonia water includes an ammonia water storage tank, an ammonia water atomization pressure pump and a two-phase nozzle, the inlet of the ammonia water atomization pressure pump is connected to the ammonia water storage tank; the two-phase nozzle includes a first phase inlet and a second phase inlet connected to each other and the outlet, the first phase inlet in the two-phase nozzle is connected with the outlet of the ammonia water atomization pressure pump, the second phase inlet in the two-phase nozzle is connected with the external high-pressure nitrogen, and the atomized ammonia water ejected from the outlet of the two-phase nozzle is The ammonia water atomization pressure pump is used to carry out pressure atomization of ammonia water and high-pressure nitrogen atomization to obtain it. This method has excellent atomization effect, small droplets and high rate. The equipment for processing the sintering flue gas to be treated is ...

Embodiment 1

[0060] The sintering flue gas to be treated undergoes a desulfurization reaction with the atomized ammonia water with a mass concentration of 8% in the flue to perform first-stage desulfurization, wherein the droplet diameter of the atomized ammonia water is ≤150 μm, and the movement direction of the sintered gas to be treated and the atomized ammonia water is the same. The atomized ammonia water is obtained through the joint action of ammonia water pressure atomization and high-pressure nitrogen atomization, wherein the pressure of ammonia water is 0.5MPa, and the pressure of high-pressure nitrogen gas is 0.5MPa. The sintering flue gas to be treated after the primary desulfurization enters the electrostatic precipitator for dust removal to obtain the primary desulfurization sintering flue gas. The length of the flue between the atomized ammonia water preparation device and the electrostatic precipitator is 50m. The temperature of the first-stage desulfurization sintering flue ...

Embodiment 2

[0062] The sintering flue gas to be treated undergoes a desulfurization reaction with the atomized ammonia water with a mass concentration of 18% in the flue to perform first-level desulfurization, wherein the atomized ammonia water droplet diameter is ≤ 130 μm, and the movement direction of the sintered gas to be treated is the same as that of the atomized ammonia water. The atomized ammonia water is obtained through the joint action of ammonia water pressure atomization and high-pressure nitrogen atomization, wherein the pressure of ammonia water is 0.6MPa, and the pressure of high-pressure nitrogen gas is 0.7MPa. The sintering flue gas to be treated after the primary desulfurization enters the electrostatic precipitator for dust removal to obtain the primary desulfurization sintering flue gas. The length of the flue between the atomized ammonia water preparation device and the electrostatic precipitator is 80m. The temperature of the first-stage desulfurization sintering flu...

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Abstract

The invention provides a sintering flue gas treatment method which comprises the following steps: mixing atomized ammonia water with sintering flue gas to be treated for primary desulfurization to obtain primary desulfurized sintering flue gas; making the primary desulfurized sintering flue gas contact with hydrated slaked lime for secondary desulfurization to obtain secondary desulfurized sintering flue gas; enabling the secondary desulfurization sintering flue gas to enter a first dust removal device for first dust removal; and enabling the secondary desulfurized sintering flue gas subjectedto the first dust removal to enter a denitration device for denitration treatment, and then conducting discharging after reaching the standard. The content of sulfur dioxide discharged into the atmosphere is 10-20 mg / Nm<3>, the content of NOx is 20-30 mg / Nm<3>, the content of dust is 2-3 mg / Nm<3>, ultra-low emission is achieved, and environmental friendliness is achieved.

Description

technical field [0001] The invention belongs to the technical field of ultra-low emission of sintering flue gas, and in particular relates to a treatment method of sintering flue gas. Background technique [0002] Sintering flue gas is a mixed gas containing sulfur dioxide, nitrogen oxides and dust produced during the combustion and sintering of the sintering mixture. The content of sulfur dioxide, nitrogen oxides and dust in the sintering flue gas exceeds the standard, polluting the atmosphere, and must be desulfurized and denitrified Disposal can only be discharged. [0003] At present, the following methods are generally used for desulfurization, denitrification and dust removal of sintering flue gas: A. wet method: limestone-gypsum method, lime-gypsum method and other desulfurization, SCR method denitrification, but the wastewater generated during desulfurization contains a large amount of It is difficult to treat heavy metals, high-salt and high-COD wastewater, and the...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/79B01D53/80B01D53/50B01D53/90B01D53/56B01D50/00
CPCB01D53/75B01D53/79B01D53/80B01D53/502B01D53/90B01D53/8625B01D50/00B01D2251/2062B01D2251/404B01D2251/604B01D2258/0283
Inventor 雷仲存刘磊崔力中毛松林吴建海李双全
Owner BEIJING SHOUGANG CO LTD
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