Process and apparatus for eliminating fume SO2 from waste coking ammonia water of iron and steel and coal chemical enterprise

A technology of SO2 and ammonia water, applied in chemical instruments and methods, separation of dispersed particles, separation methods, etc., can solve the problems of large investment and achieve the effects of improving economic benefits, reducing energy consumption, and reducing production costs

Active Publication Date: 2007-06-27
ASIA PACIFIC ENVIRONMENTAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For flue gas desulfurization of enterprises without sulfuric acid production equipment, sulfuric acid equipment needs to be built with the above method, which requires a large investment. At present, the ammonia method is being developed to absorb SO at home and abroad. 2 The method that the nitrite formed is directly oxidized to ammonium sulfate

Method used

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  • Process and apparatus for eliminating fume SO2 from waste coking ammonia water of iron and steel and coal chemical enterprise
  • Process and apparatus for eliminating fume SO2 from waste coking ammonia water of iron and steel and coal chemical enterprise

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Directly use 2% low-concentration waste ammonia water produced by coking as the ammonia source of the absorbent for sintering flue gas or coal-fired boiler flue gas SO 2 The removal of Fe +3 , After the treatment, the flue gas is discharged up to the standard, and the ammonium sulfate is recovered. The specific process is as follows:

[0018] 1. Hot flue gas or boiler flue gas from steel sintering at 130°C (SO 2 Concentration 1000mg-2000mg / Nm 3 , Dust 3 , has been electrostatically precipitated or bagged), and enters the reverse nozzle of the flue gas cooling and mother liquor concentration tower (7) from the upper part at a gas velocity of 20m / s. 3 Ammonium sulfate salt solution, the liquid-gas volume ratio L / G is 3 / 1000, after adiabatically cooling to 50°C in the turbulent flow reverse spray tower, the flue gas is discharged from the top of the flue gas cooling and mother liquor concentration tower (7) and discharged at a distance of 20m / s gas velocity enters the...

Embodiment 2

[0022] Directly use 10% low-concentration waste ammonia water produced by coking as the ammonia source of the absorbent for sintering flue gas or coal-fired boiler flue gas SO 2 removal; S 2 o 3 -2 , After the treatment, the flue gas is discharged up to the standard, and the ammonium sulfate is recovered. The specific process is as follows:

[0023] 1. Hot flue gas or boiler flue gas from steel sintering at 140°C (SO 2 Concentration 2000mg-5000mg / Nm 3 , Dust 3 , has been electrostatically precipitated or bagged), and enters the reverse nozzle of the flue gas cooling and mother liquor concentration tower (7) from the upper part at a gas velocity of 22m / s. 3 ammonium sulfate solution, the liquid-gas volume ratio L / G is 3 / 1000, after adiabatically cooling to 60°C in the turbulent reverse spray tower, the flue gas is discharged from the top of the flue gas cooling and mother liquor concentrating tower (7) and discharged at 23m / s gas velocity enters the upper reverse nozzle ...

Embodiment 3

[0027] Directly use 20% low-concentration waste ammonia water produced by coking as the ammonia source of the absorbent for sintering flue gas or coal-fired boiler flue gas SO 2 The removal of Fe +3 , After the treatment, the flue gas is discharged up to the standard, and the ammonium sulfate is recovered. The specific process is as follows:

[0028] 1. Hot flue gas or boiler flue gas from steel sintering at 150°C (SO 2 Concentration 3000mg-5000mg / Nm 3 , Dust 3 , has been electrostatically precipitated or bagged), and enters the reverse nozzle of the flue gas cooling and mother liquor concentration tower (7) from the upper part at a gas velocity of 27m / s, and the lower part of the reverse nozzle is sprayed upwards by the nozzle at 50°C and a density of 1230g / m3 3 Ammonium sulfate salt solution, the liquid-gas volume ratio L / G is 3 / 1000, after being adiabatically cooled to 65°C in the turbulent flow reverse spray tower, the flue gas is discharged from the top of the flue gas...

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Abstract

The present invention belongs to the field of chemical industry and environment protection technology, and is especially process and apparatus for eliminating SO2 from fume with waste coking ammonia water in iron and steel and coal chemical enterprise. The process of eliminating SO2 from fume uses low concentration ammonia water from coking production as the ammonia source of the absorbent and has Fe+3 or S2O3-2 ion added in the oxidation process before ammonium sulfate is recovered. The apparatus consists of a high-level ammonia water tank, an absorption column, an absorbing liquid circulating pump, a catalyst solution tank, an absorbing liquid conveying pump, a blower, a fume cooling and mother liquid concentrating tower, a salt oxidizing tower, an ammonium sulfate mother liquid circulating tank, a star valve, an ammonium sulfate output filtering pump, a filter and an ammonium sulfate circulating pump.

Description

Technical field: [0001] The invention relates to a method for removing flue gas SO from coking waste ammonia water in iron and steel and coal chemical enterprises 2 The process and device belong to the technical field of chemical engineering and environmental protection. [0002] Involving iron and steel and coal chemical enterprises using coking equipment to produce low-concentration waste ammonia water to remove steel sintering flue gas or boiler flue gas SO 2 , to achieve the purpose of controlling environmental pollution and comprehensive utilization of resources to produce fertilizer products. Background technique: [0003] Ammonia absorption of SO 2 It uses the classic chemical principle, one is the direct spraying of ammonia water and the SO in the flue gas 2 directly generated (NH 4 ) 2 SO 3 , NH 4 HSO 3 , This direct method has large loss of ammonia, large secondary pollution, and high cost. Industrial application of desulfurization is the use of (NH 4 ) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/79
Inventor 曾子平刘应隆
Owner ASIA PACIFIC ENVIRONMENTAL CORP
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