Sulfur and dust removing method for boiler

Abstract

The invention discloses a sulfur and dust removing method for a boiler. The method comprises the following steps: introducing industrial boiler exhaust gas into a sulfur and dust removing purifying tower under the action of an induced draft fan; injecting spray water having the pH ranging from 8 to 12 to the tower by a circulating water pump for multiple-stage spraying so that dust and SO2 in the exhaust gas are removed, and discharging the exhaust gas without dust and sulfur to high altitude by a chimney; flowing sulfur and dust removal sewage into a settling pond; settling the dust in the settling pond and then clearing away the dust out of the pond by a dust remover, while flowing the clear water into a clarification tank; and because the pH value of the spray water is reduced after sulfur removal, quantitatively adding NaOH alkali liquor to water so that the spray water is capable of keeping the pH between 8-12 all the time, thereby guaranteeing the sulfur removal effect. The method provided by the invention is reasonable in process flow, reliable and excellent in effect, has dual effects of dust removal and sulfur removal, and has wide application prospect in industrial enterprises.

Description

technical field

[0001] The invention discloses a boiler environmental protection operation process method, in particular to a boiler desulfurization and dust removal process method, which is suitable for a desulfurization and dust removal system for industrial steam boiler waste gas discharge. Background technique

[0002] The flue gas produced by coal-fired steam boilers is the main factor causing soot-type air pollution in my country. Dust in flue gas is the main source of air pollutants. In order to reduce the pollution of flue gas to the atmosphere, it is necessary to carry out comprehensive treatment in many aspects. On the one hand, adopt high-efficiency and low-pollution combustion technology to improve the burning process of material A, control the generation of smoke and dust, and fundamentally reduce the pollution of smoke to the atmosphere; on the other hand, use economical and effective flue gas purification technology to improve The performance of the flue gas...

Examples

Embodiment 1

[0022] With the adoption of the present invention, the boiler waste gas and smoke enter the water film dedusting purification tower under the action of the induced draft fan, and the circulating pump pumps the spray water with pH=8-10 into the tower for multi-stage spraying to remove the dust in the waste gas and SO 2 , the waste gas after dust removal and desulfurization is discharged from the chimney at high altitude; the dust removal and desulfurization sewage flows into the sedimentation tank, the dust is settled in the sedimentation tank and is cleaned out of the tank by the dust remover, and the clean water flows into the clarification tank. After desulfurization, the pH value of the spray water drops, which needs to be quantified Add NaOH lye to the water (NaOH reagent is commercially available), so that the spray water always maintains pH=8~10, so as to ensure the desulfurization effect.

Embodiment 2

[0024] SO in boiler exhaust gas 2 and smoke and dust are eliminated according to the following steps:

[0025] Boiler soot 1 enters the purification tower 2, and in the tower, it is sprayed in multiple stages by spraying water to remove dust and SO in the exhaust gas 2 The dedusting and desulfurization sewage 3 flows into the sedimentation tank 4. After the dust settles in the sedimentation tank, it is cleaned out of the tank by the dust remover, and the supernatant flows into the clarification tank 5. After desulfurization, the pH value of the spray water drops, and it is necessary to add lye to the water quantitatively. NaOH6 (NaOH reagent is commercially available) keeps the spray water at pH=8-12, and the circulating water pump 7 injects the spray water 8 into the purification tower. The chimney 10 discharges into the atmosphere 11 at high altitude. Appropriately increasing the pH value of the spray water is more conducive to improving the desulfurization effect. The dus...

Embodiment 3

[0027] Comparative test (same batch of raw materials)

[0028] (1) Conventional coal-fired boiler inertial dedusting method: Inertial dedusting method is a method of separating dust particles from the airflow by using the inertial force generated by the impact of dusty flue gas on the baffle or the change of direction of the airflow. The steps are: the boiler smoke enters the flue through the flue inlet under the action of the induced draft fan, the smoke impacts the smoke hood and changes direction, the inertial force separates the larger dust particles from the flue gas, and the dust-removed flue gas passes through the chimney vented to the atmosphere.

[0029] (2) Water film desulfurization and dedusting method of the present invention: method step sees embodiment 2:

[0030] Comparative test data

[0031]

technical field

[0001] The invention discloses a boiler environmental protection operation process method, in particular to a boiler desulfurization and dust removal process method, which is suitable for a desulfurization and dust removal system for industrial steam boiler waste gas discharge. Background technique

[0002] The flue gas produced by coal-fired steam boilers is the main factor causing soot-type air pollution in my country. Dust in flue gas is the main source of air pollutants. In order to reduce the pollution of flue gas to the atmosphere, it is necessary to carry out comprehensive treatment in many aspects. On the one hand, adopt high-efficiency and low-pollution combustion technology to improve the burning process of material A, control the generation of smoke and dust, and fundamentally reduce the pollution of smoke to the atmosphere; on the other hand, use economical and effective flue gas purification technology to improve The performance of the flue gas...

Examples

Embodiment 1

[0022] With the adoption of the present invention, the boiler waste gas and smoke enter the water film dedusting purification tower under the action of the induced draft fan, and the circulating pump pumps the spray water with pH=8-10 into the tower for multi-stage spraying to remove the dust in the waste gas and SO 2 , the waste gas after dust removal and desulfurization is discharged from the chimney at high altitude; the dust removal and desulfurization sewage flows into the sedimentation tank, the dust is settled in the sedimentation tank and is cleaned out of the tank by the dust remover, and the clean water flows into the clarification tank. After desulfurization, the pH value of the spray water drops, which needs to be quantified Add NaOH lye to the water (NaOH reagent is commercially available), so that the spray water always maintains pH=8~10, so as to ensure the desulfurization effect.

Embodiment 2

[0024] SO in boiler exhaust gas 2 and smoke and dust are eliminated according to the following steps:

[0025] Boiler soot 1 enters the purification tower 2, and in the tower, it is sprayed in multiple stages by spraying water to remove dust and SO in the exhaust gas 2 The dedusting and desulfurization sewage 3 flows into the sedimentation tank 4. After the dust settles in the sedimentation tank, it is cleaned out of the tank by the dust remover, and the supernatant flows into the clarification tank 5. After desulfurization, the pH value of the spray water drops, and it is necessary to add lye to the water quantitatively. NaOH6 (NaOH reagent is commercially available) keeps the spray water at pH=8-12, and the circulating water pump 7 injects the spray water 8 into the purification tower. The chimney 10 discharges into the atmosphere 11 at high altitude. Appropriately increasing the pH value of the spray water is more conducive to improving the desulfurization effect. The dus...

Embodiment 3

[0027] Comparative test (same batch of raw materials)

[0028] (1) Conventional coal-fired boiler inertial dedusting method: Inertial dedusting method is a method of separating dust particles from the airflow by using the inertial force generated by the impact of dusty flue gas on the baffle or the change of direction of the airflow. The steps are: the boiler smoke enters the flue through the flue inlet under the action of the induced draft fan, the smoke impacts the smoke hood and changes direction, the inertial force separates the larger dust particles from the flue gas, and the dust-removed flue gas passes through the chimney vented to the atmosphere.

[0029] (2) Water film desulfurization and dedusting method of the present invention: method step sees embodiment 2:

[0030] Comparative test data

[0031]

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