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Purification technology for side product of flue gas ammonia-desulphurization

A technology of ammonia desulfurization and by-products, which is applied in the field of flue gas ammonia method, can solve the problems affecting the quality of by-products, achieve the effects of improving gas mixing efficiency, prolonging the cycle of backwashing, and improving the filtering effect

Inactive Publication Date: 2012-12-19
武汉钢铁有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the sintering flue gas also contains impurities such as fine dust, during the synchronous desulfurization and denitrification process of the ammonia method, these pollutants will also enter the absorption liquid along with the absorption reaction process. The fine dust brought in acts as a crystal nucleus, which will seriously affect the quality of by-products. How to fully oxidize ammonium sulfite and ammonium nitrite into ammonium sulfate, ammonium nitrate and remove impurities is an urgent problem to be solved.

Method used

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  • Purification technology for side product of flue gas ammonia-desulphurization
  • Purification technology for side product of flue gas ammonia-desulphurization
  • Purification technology for side product of flue gas ammonia-desulphurization

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Embodiment 1

[0044] 1. Solid-liquid separation: 20-50% of the total amount of room temperature air from the bottom of the desulfurization tower (the total volume percentage of room temperature air required to fully oxidize ammonium sulfite and ammonium nitrite in the absorption liquid is 100%), combined with the absorption liquid The ammonium sulfite and ammonium nitrite in the solution are partially oxidized, and then the absorption liquid (solid phase content 5-10% by mass) is transported to the heating and dissolving tank by the delivery pump, and part of the flue gas (such as the low-sulfur section flue gas temperature (Generally 180-200°C) Indirectly heated to 75-90°C, the flue gas after heat exchange is sent back to the desulfurization tower; the heated absorption liquid is sent to the oil and slag removal tank for standing, and then settles and stratifies to form an oil phase and dissolve The water phase and solid-liquid mixed phase with ammonium sulfate and ammonium sulfite, skim o...

Embodiment 2

[0048] In step 1, steam is used to directly heat the absorption liquid; in step 2, the solid-liquid mixture filtered by the filter membrane is returned to the oil and slag removal tank for standing and then settled for separation, and the gas phase obtained in steps 2 and 3 is directly discharged, and the rest With embodiment 1.

Embodiment 3

[0050] In step 2, the solid-liquid mixture part (50% by weight) filtered by the filter membrane is returned to the oil and slag removal tank for standing and then settled for separation, and part is sent to the filtration system for filtration. All the other are with embodiment 1.

[0051] Reactor Example:

[0052] refer to image 3 and Figure 4 , the top of the cylinder 1 is provided with an exhaust port 2, and the bottom is provided with a sewage outlet 3, and the cylinder 1 is provided with a filter membrane assembly 6 along the center of the axis, referring to Figure 5 , the filter membrane assembly 6 is composed of multilayer membrane tubes 6.1, membrane tube drain frame 6.2 and clear liquid outlet 6.3 which are connected to each other. The membrane tubes in the multilayer membrane tubes are hollow fiber membranes, and the membrane aperture range is 0.05- 0.5 μm. In this embodiment, the filter membrane assembly 6 includes two groups arranged vertically along the axi...

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Abstract

The invention discloses a purification technology for a side product of flue gas ammonia-desulphurization, by the purification technology, the problem of influence on product quality caused by that the dust cannot be removed in the existing purification technology is solved. The technical scheme comprises the following steps of: 1, solid liquid separation: heating an absorption solution to be 75 DEG C to 90 DEG C, standing, settling and separating, so as to obtain an oil phase of the uppermost layer, a water phase of the intermediate layer, and a solid-liquid mixed phase of the lower layer; 2, film filter oxidization: introducing the water phase in a film filter oxidization device, bubbling while filtering, introducing hot air, keeping the hot air at the temperature of 75 DEG C to 90 DEG C, carrying out oxidization of ammonium sulfate and ammonium nitrite, and film filter treatment of dust, so as to obtain a gas phase, a filtrate and a solid-liquid mixed phase; 3, concentrating cooling: introducing bubbles in the filtrate in room-temperature air, or spraying the filtrate to contact room-temperature air, concentrating and cooling to 55 DEG C to 60 DEG C, so as to obtain a gas phase and a cooled solution, and introducing the cooled solution in an ammonium sulfate crystallizing system to carry out the ammonium sulfate crystallization treatment. The technology disclosed by the invention is simple in process, low in operation cost, is doubled as oxidization and dust removing, and high-quality ammonium sulfate products can be obtained.

Description

technical field [0001] The invention relates to a flue gas ammonia method, in particular to a refining process for by-products of the flue gas ammonia method desulfurization. Background technique [0002] The iron and steel industry is a pillar industry of my country's national economy and a basic industry related to the national economy and the people's livelihood. However, the iron and steel industry is also a high-energy-consumption and high-pollution industry. In 2010, the ton of steel SO 2 The emission is 1.95kg. Sintering flue gas is the main source of SOx and NOx next to power plant flue gas. To reinforce SO 2 Emission reduction. At present, many domestic steel mills have implemented sintering flue gas desulfurization. [0003] There are many kinds of sintering flue gas desulfurization technologies, which can be applied to different systems. However, in terms of combined desulfurization and denitrification of sintering flue gas, the ammonia process has obvious adv...

Claims

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Application Information

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IPC IPC(8): C01C1/24B01D53/78B01D53/50
Inventor 吴高明傅连春王剑肖扬刘汉杰幸福堂韩军
Owner 武汉钢铁有限公司
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