Flue gas desulfurization and SCR denitration combined system and flue gas treatment process

Abstract

The invention provides a flue gas desulfurization and SCR denitration combined system and process. The flue gas desulfurization system comprises: a desulfurization tower, wherein the desulfurization tower comprises a flue gas washing section, a flue gas desulfurization section, a desulfurization liquid capturing section, a flue gas cooling section, a demisting section and a flue gas preheating section which are sequentially arranged from bottom to top; a gas rising hole is formed in a smoke rotation accelerating device in the trapping section, and smoke is accelerated after passing through the gas rising hole; and the opening degree of the gas raising hole is greater than or equal to 25% and less than 100%; a flue gas heat exchange unit connected with the flue gas preheating section; a flue gas mixer sequentially connected with the flue gas heat exchange units; and an SCR denitration reactor and a heat exchanger. The desulfurization liquid trapping section is arranged, so that a desulfurization agent entrained in flue gas can be trapped and recycled, escape of the desulfurization agent and secondary pollution caused by escape of the desulfurization agent are reduced, and the emission concentration of SO2 and NOx is relatively low.

Description

technical field

[0001] The invention belongs to the field of metallurgical waste gas treatment and resource utilization, and in particular relates to a flue gas desulfurization and SCR denitrification combined system and a flue gas treatment process. Background technique

[0002] Organic amine flue gas desulfurization technology is a relatively common desulfurization technology currently used. It uses organic amines as desulfurizers to absorb SO in the flue gas in a circular manner. 2 And it is made into sulfuric acid, which is a truly efficient and green flue gas desulfurization technology. This process technology has engineering applications in the fields of sintering flue gas desulfurization, non-ferrous smelting flue gas desulfurization, and sulfuric acid tail gas.

[0003] The traditional organic amine method or ionic liquid flue gas desulfurization technology mainly includes flue gas washing system, desulfurization absorption system, desulfurization solution regenerati...

Examples

Embodiment 1

[0084] The sintering flue gas of an iron and steel enterprise, the flue gas volume is 60×10 4 m 3 / h,SO 2 The concentration is 5500mg / m 3 , NO x The concentration is 285mg / m 3 , the flue gas temperature is 130°C, and the dust content is 15mg / m 3 , the flue gas humidity is 10.5%, the flue gas temperature after the flue gas is washed with washing water is 47°C, the temperature of the desulfurizer entering the desulfurization tower is 48°C, and the circulation volume of the desulfurizer is 290m 3 / h of flue gas desulfurizer reverse contact reaction, after reacting with flue gas desulfurizer, the temperature of the flue gas is 55°C, the opening of the flue gas rotating acceleration device is 60%, and the humidity of the flue gas entering the flue gas cooling section is 13.9% , the flue gas desulfurizer content in the flue gas humidity is 0.002%, the flue gas temperature is 46°C after the flue gas is cooled by the flue gas cooling section, and the flue gas humidity is 8.4%; T...

Embodiment 2

[0087] The sintering flue gas of an iron and steel enterprise, the flue gas volume is 60×10 4 m 3 / h,SO 2 The concentration is 5500mg / m 3 , NO x The concentration is 285mg / m 3 , the flue gas temperature is 130°C, and the dust content is 15mg / m 3 , the flue gas humidity is 10.5%, the flue gas temperature after the flue gas is washed with washing water is 47°C, the temperature of the desulfurizer entering the desulfurization tower is 48°C, and the circulation volume of the desulfurizer is 290m 3 / h of flue gas desulfurizer reverse contact reaction, the temperature of flue gas after reacting with flue gas desulfurizer is 55°C, the opening degree of flue gas rotating acceleration device is 50%, and the humidity of flue gas entering the flue gas cooling section is 13.9% , the flue gas desulfurizer content in the flue gas humidity is 0.001%, the flue gas temperature after the flue gas is cooled by the flue gas cooling section is 46°C, the flue gas humidity is 8.4%, and the flue...

Embodiment 3

[0090] The sintering flue gas of an iron and steel enterprise, the flue gas volume is 60×10 4 m 3 / h,SO 2 The concentration is 5500mg / m 3 , NO x The concentration is 285mg / m 3 , the flue gas temperature is 130°C, and the dust content is 15mg / m 3 , the flue gas humidity is 10.5%, the flue gas temperature after the flue gas is washed with washing water is 47°C, the temperature of the desulfurizer entering the desulfurization tower is 48°C, and the circulation volume of the desulfurizer is 290m 3 / h of flue gas desulfurizer reverse contact reaction, the temperature of flue gas after reacting with flue gas desulfurizer is 55°C, the opening degree of flue gas rotating acceleration device is 85%, and the humidity of flue gas entering the flue gas cooling section is 13.9% , the flue gas desulfurizer content in the flue gas humidity is 0.021%, the flue gas temperature is 46°C after the flue gas is cooled by the flue gas cooling section, the flue gas humidity is 8.4%, and the flue...

technical field

[0001] The invention belongs to the field of metallurgical waste gas treatment and resource utilization, and in particular relates to a flue gas desulfurization and SCR denitrification combined system and a flue gas treatment process. Background technique

[0002] Organic amine flue gas desulfurization technology is a relatively common desulfurization technology currently used. It uses organic amines as desulfurizers to absorb SO in the flue gas in a circular manner. 2 And it is made into sulfuric acid, which is a truly efficient and green flue gas desulfurization technology. This process technology has engineering applications in the fields of sintering flue gas desulfurization, non-ferrous smelting flue gas desulfurization, and sulfuric acid tail gas.

[0003] The traditional organic amine method or ionic liquid flue gas desulfurization technology mainly includes flue gas washing system, desulfurization absorption system, desulfurization solution regenerati...

Examples

Embodiment 1

[0084] The sintering flue gas of an iron and steel enterprise, the flue gas volume is 60×10 4 m 3 / h,SO 2 The concentration is 5500mg / m 3 , NO x The concentration is 285mg / m 3 , the flue gas temperature is 130°C, and the dust content is 15mg / m 3 , the flue gas humidity is 10.5%, the flue gas temperature after the flue gas is washed with washing water is 47°C, the temperature of the desulfurizer entering the desulfurization tower is 48°C, and the circulation volume of the desulfurizer is 290m 3 / h of flue gas desulfurizer reverse contact reaction, after reacting with flue gas desulfurizer, the temperature of the flue gas is 55°C, the opening of the flue gas rotating acceleration device is 60%, and the humidity of the flue gas entering the flue gas cooling section is 13.9% , the flue gas desulfurizer content in the flue gas humidity is 0.002%, the flue gas temperature is 46°C after the flue gas is cooled by the flue gas cooling section, and the flue gas humidity is 8.4%; T...

Embodiment 2

[0087] The sintering flue gas of an iron and steel enterprise, the flue gas volume is 60×10 4 m 3 / h,SO 2 The concentration is 5500mg / m 3 , NO x The concentration is 285mg / m 3 , the flue gas temperature is 130°C, and the dust content is 15mg / m 3 , the flue gas humidity is 10.5%, the flue gas temperature after the flue gas is washed with washing water is 47°C, the temperature of the desulfurizer entering the desulfurization tower is 48°C, and the circulation volume of the desulfurizer is 290m 3 / h of flue gas desulfurizer reverse contact reaction, the temperature of flue gas after reacting with flue gas desulfurizer is 55°C, the opening degree of flue gas rotating acceleration device is 50%, and the humidity of flue gas entering the flue gas cooling section is 13.9% , the flue gas desulfurizer content in the flue gas humidity is 0.001%, the flue gas temperature after the flue gas is cooled by the flue gas cooling section is 46°C, the flue gas humidity is 8.4%, and the flue...

Embodiment 3

[0090] The sintering flue gas of an iron and steel enterprise, the flue gas volume is 60×10 4 m 3 / h,SO 2 The concentration is 5500mg / m 3 , NO x The concentration is 285mg / m 3 , the flue gas temperature is 130°C, and the dust content is 15mg / m 3 , the flue gas humidity is 10.5%, the flue gas temperature after the flue gas is washed with washing water is 47°C, the temperature of the desulfurizer entering the desulfurization tower is 48°C, and the circulation volume of the desulfurizer is 290m 3 / h of flue gas desulfurizer reverse contact reaction, the temperature of flue gas after reacting with flue gas desulfurizer is 55°C, the opening degree of flue gas rotating acceleration device is 85%, and the humidity of flue gas entering the flue gas cooling section is 13.9% , the flue gas desulfurizer content in the flue gas humidity is 0.021%, the flue gas temperature is 46°C after the flue gas is cooled by the flue gas cooling section, the flue gas humidity is 8.4%, and the flue...

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