CN112791578B - Method for flue gas desulfurization and comprehensive recycling - Google Patents
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
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Abstract
The invention provides a method for flue gas desulfurization and comprehensive recycling, belonging to the technical field of atmospheric treatment. The method provided by the invention adopts the zinc hypoxide slurry to adsorb the flue gas, so as to obtain the preliminarily purified flue gas and the adsorption slurry; mixing the adsorption slurry with zinc hypoxide slurry to obtain regenerated slurry; and desulfurizing the primarily purified flue gas by using the regenerated slurry to obtain purified flue gas and stable slurry. The method controls the pH value of the secondary zinc oxide slurry to be 8-9, can efficiently adsorb sulfur dioxide in the flue gas, and enables the removal rate of sulfur dioxide in the primarily purified flue gas to be as high as 99-99.5%; meanwhile, the application range of the secondary zinc oxide is expanded, and the recycling of the secondary zinc oxide is realized; in addition, the final filter residue can be used for preparing zinc by electrolysis, and the filtrate can be used for preparing secondary zinc oxide slurry, so that economic benefit and environmental benefit are realized, and the purpose of killing two birds with one stone is achieved.
Description
Technical Field
The invention relates to the technical field of atmospheric treatment, in particular to a method for flue gas desulfurization and comprehensive recycling.
Background
The flue gas of the boiler of the lead-zinc smelting enterprise has sulfur dioxide, nitrogen oxide, dust and the like which cause serious pollution to the atmosphere, and especially sulfur dioxide causes great harm to the environment and the human body. Therefore, how to remove sulfur dioxide becomes a key point for research and development of enterprises and social attention.
Although the research on the Flue Gas Desulfurization (FGD) system begins very early in China and the related aspects are very wide, most of the technologies only stay in a small test bench or a pilot plant stage and are far from reaching the degree of large-area industrial application.
At present, the country controls energy conservation and emission reduction more and more. The control of the discharge index of the sulfur dioxide flue gas with ultra-low concentration is a great matter for various enterprises to treat sulfur dioxide.
Disclosure of Invention
In view of this, the present invention provides a method for desulfurizing flue gas and comprehensively recycling the flue gas, and the method provided by the present invention has a high removal rate of sulfur dioxide in flue gas.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for flue gas desulfurization and comprehensive recycling, which comprises the following steps:
adsorbing the flue gas by using secondary zinc oxide slurry to obtain primary purified flue gas and adsorption slurry;
Mixing the adsorption slurry with secondary zinc oxide slurry to obtain regenerated slurry; desulfurizing the preliminarily purified flue gas by using the regenerated slurry to obtain purified flue gas and stable slurry;
performing filter pressing on the stable slurry, and using the obtained filtrate to prepare zinc hypoxide slurry; the obtained filter residue is used for preparing zinc by electrolysis;
and the pH value of the secondary zinc oxide slurry is 8-9.
Preferably, the mass content of zinc oxide in the secondary zinc oxide slurry is 50-55%.
Preferably, the mass content of zinc oxide in the zinc hypoxide for the zinc hypoxide slurry is 50-55%.
Preferably, the particle size of the zinc hypoxide for the zinc hypoxide slurry is 100-150 meshes.
Preferably, the secondary zinc oxide slurry adsorbs flue gas in the form of spray liquid; the flow velocity of the spraying liquid is 200-300 m3H; the flow velocity of the flue gas is 12-17 m/s.
Preferably, the temperature of adsorption is 200-300 ℃.
Preferably, the pH value of the regeneration slurry is 5.0-5.8.
Preferably, the regenerated slurry is used for desulfurizing the primarily purified flue gas in a spraying liquid mode, and the flow velocity of the spraying liquid is 200-300 m3H; the flow velocity of the primary purified flue gas is 12-17 m/s.
Preferably, the temperature of the desulfurization is 200-300 ℃.
The invention provides a method for flue gas desulfurization and comprehensive recycling, which comprises the following steps: adopting secondary zinc oxide slurry to adsorb the flue gas to obtain primary purified flue gas and adsorption slurry; mixing the adsorption slurry with secondary zinc oxide slurry to obtain regenerated slurry; desulfurizing the primarily purified flue gas by using the regenerated slurry to obtain purified flue gas and stable slurry; performing filter pressing on the stable slurry, and using the obtained filtrate to prepare zinc hypoxide slurry; the obtained filter residue is used for preparing zinc by electrolysis; the pH value of the secondary zinc oxide slurry is 8-9. The method controls the pH value of the zinc hypoxide slurry to be 8-9, can efficiently adsorb sulfur dioxide in flue gas, and can primarily purify the flue gas to remove the sulfur dioxide with the removal rate of 99-99.5%; meanwhile, the application range of the secondary zinc oxide is expanded, and the recycling is realized; in addition, the final filter residue can be used for preparing zinc by electrolysis, and the filtrate can be used for preparing secondary zinc oxide slurry, so that the economic benefit and the environmental benefit are realized, and the purpose of killing two birds with one stone is achieved.
Drawings
FIG. 1 is a flow chart of the flue gas desulfurization and comprehensive recycling method provided by the invention.
Detailed Description
The invention provides a method for desulfurizing and comprehensively recovering flue gas, which comprises the following steps:
adopting secondary zinc oxide slurry to adsorb the flue gas to obtain preliminarily purified flue gas and adsorption slurry;
mixing the adsorption slurry with secondary zinc oxide slurry to obtain regenerated slurry; desulfurizing the primary purified flue gas by using the regenerated slurry to obtain purified flue gas and stable slurry;
performing filter pressing on the stable slurry, and using the obtained filtrate to prepare zinc hypoxide slurry; the obtained filter residue is used for preparing zinc by electrolysis;
the pH value of the secondary zinc oxide slurry is 8-9.
In the present invention, the starting materials used in the present invention are preferably commercially available products unless otherwise specified.
According to the invention, the secondary zinc oxide slurry is adopted to adsorb the flue gas, so as to obtain the primary purified flue gas and the adsorption slurry. In the invention, the pH value of the secondary zinc oxide slurry is 8-9; the pH regulator for the secondary zinc oxide slurry is preferably sodium hydroxide; the concentration and the dosage of the pH regulator are not particularly limited, and the final pH of the zinc hypoxide slurry can be ensured to be 8-9. In the invention, the mass content of zinc oxide in the zinc suboxide slurry is preferably 50-55%. In the invention, the mass content of zinc oxide in the zinc hypoxide for the zinc hypoxide slurry is preferably 50-55%; the particle size of the zinc suboxide for the zinc suboxide slurry is preferably 100-150 meshes. In the present invention, the secondary zinc oxide slurry is preferably prepared by a method comprising the steps of: and mixing the secondary zinc oxide with water, filtering, and adjusting the pH value by using a pH regulator to obtain the secondary zinc oxide slurry. The using amount ratio of the zinc hypoxide to the water is not particularly limited, and the zinc hypoxide slurry can ensure that the mass concentration of the zinc oxide in the final zinc hypoxide slurry is 50-55%. In the present invention, the mixing is preferably performed by stirring; the filtration apparatus of the present invention is not particularly limited.
In the invention, the secondary zinc oxide slurry preferably adsorbs flue gas in the form of spray liquid; the flow velocity of the spraying liquid is preferably 200-300 m3H, particularly preferably 200m3/h、300m3H,; the flow velocity of the flue gas is preferably 12-17 m/s, and particularly preferably 13.5m/s and 16.5 m/s; the adsorption temperature is preferably 200-300 ℃, and the adsorption temperature is the temperature of the flue gas.
In the invention, the secondary zinc oxide slurry is contacted with sulfur dioxide in flue gas to generate adsorption slurry with the main component of zinc sulfite.
After the adsorption slurry is obtained, mixing the adsorption slurry with secondary zinc oxide slurry to obtain regenerated slurry; and desulfurizing the primary purified flue gas by using the regenerated slurry to obtain purified flue gas and stable slurry. In the invention, the pH value of the regeneration slurry is preferably 5.0-5.8, and is further preferably 5.5; the use amount ratio of the adsorption slurry to the secondary zinc oxide slurry is not particularly limited, and only the pH value of the regeneration slurry can be ensured to be 5.0-5.8. In the invention, the regenerated slurry is preferably used for desulfurizing the primarily purified flue gas in the form of spray liquid, and the spray liquid is used for removing sulfur from the primarily purified flue gas The flow velocity of (2) is preferably 200 to 300m3H, particularly preferably 250m3/h、260m3/h、300m3H; the flow velocity of the primarily purified flue gas is preferably 12-17 m/s, and particularly preferably 13.5m/s, 14m/s and 16.5 m/s. In the invention, the temperature of the desulfurization is preferably 200-200 ℃; the temperature of the desulfurization is the temperature of the primary purified flue gas.
After stable slurry is obtained, the stable slurry is subjected to filter pressing, and the obtained filtrate is used for preparing secondary zinc oxide slurry; the obtained filter residue is used for preparing zinc by electrolysis. The filter pressing mode is not particularly limited, and only solid-liquid separation can be realized; the operation of electrolyzing the filter residue to prepare the zinc is not particularly limited, and the method well known by the technical personnel in the field can be adopted.
According to the invention, the filtrate obtained by filter pressing is used for preparing the zinc hypoxide slurry, and the obtained filter residue is used for preparing zinc by electrolysis, so that resource utilization is realized, and the generation of waste is avoided.
FIG. 1 is a flow chart of a flue gas desulfurization and comprehensive recycling method provided by the invention, zinc suboxide slurry is prepared by using zinc suboxide, and the zinc suboxide slurry is mixed with boiler flue gas for adsorption to obtain adsorption slurry and primary purified flue gas; the adsorption slurry and the secondary zinc oxide slurry are mixed to form regenerated slurry, and the regenerated slurry is used for desulfurizing the primarily purified flue gas to obtain purified flue gas and stable slurry; filter-pressing the stable slurry to obtain filtrate and filter residue; the filter residue is used for preparing zinc by electrolysis, and the filtrate is used for preparing zinc hypoxide slurry. .
The method for desulfurization and comprehensive recycling of flue gas provided by the present invention will be described in detail with reference to the following examples, which should not be construed as limiting the scope of the present invention.
Example 1
The components of the smoke are as follows: SO2The content is 7000m3/kg；
The method for desulfurizing the flue gas and comprehensively recycling the flue gas comprises the following steps of:
preparing secondary zinc oxide slurry: the zinc suboxide is obtained from smelting manufacturers and fireworks furnace manufacturers, wherein the mass content of zinc oxide in the zinc suboxide is 50%, and the particle size is 100-120 meshes; mixing the zinc hypoxide with water, filtering, and adding sodium hydroxide to adjust the pH value to obtain zinc hypoxide slurry with the mass concentration of 55% and the pH value of 8;
the secondary zinc oxide slurry is 200m3Spraying at a flow speed of 13.5m/s, and contacting and adsorbing with flue gas at a temperature of 200-300 ℃ to obtain adsorption slurry and primarily purified flue gas;
mixing the adsorption slurry with secondary zinc oxide slurry to obtain regenerated slurry, wherein the pH value of the regenerated slurry is 5.5;
the regeneration slurry is 250m3Spraying at a flow speed of/h, and contacting with primarily purified flue gas with a flow speed of 13.5m/s and a temperature of 200-280 ℃ for desulfurization to obtain stable slurry and purified flue gas;
And (3) filter-pressing the stable slurry, wherein the obtained filtrate is used for preparing zinc hypoxide slurry, and the obtained filter residue is used for preparing zinc by electrolysis.
Measuring SO in the purified flue gas2The content is 46m3The desulfurization rate was 99.34% per kg.
And (3) calculating: the desulfurization rate was 7000-46/7000 × 100%, 99.34%.
Example 2
The components of the smoke are as follows: SO (SO)2The content is 8000m3/kg：
The method for flue gas desulfurization and comprehensive recycling comprises the following steps:
preparing a secondary zinc oxide slurry: the secondary zinc oxide is obtained from smelting and firework furnace manufacturers, the mass content of zinc oxide in the secondary zinc oxide is 55%, and the particle size is 100-150 meshes; mixing the zinc suboxide with water, filtering, and adding sodium hydroxide to adjust the pH value to obtain zinc suboxide slurry with the mass concentration of 55% and the pH value of 9;
the secondary zinc oxide slurry is 200m3Spraying at a flow speed of 13.5m/s, and contacting and adsorbing with flue gas at a temperature of 200-280 ℃ to obtain adsorption slurry and primarily purified flue gas;
in the suctionMixing the secondary slurry and zinc hypoxide to obtain regenerated slurry with the pH value of 5.5, wherein the regenerated slurry is 260m3Spraying at a flow speed of/h, and performing contact desulfurization on the primarily purified flue gas at a flow speed of 14m/s and a temperature of 200-260 ℃ to obtain stable slurry and purified flue gas;
And (3) filter-pressing the stable slurry, wherein the obtained filtrate is used for preparing zinc hypoxide slurry, and the obtained filter residue is used for preparing zinc by electrolysis.
Measuring SO in the purified flue gas2The content is 52m3The desulfurization rate was 99.35% per kg.
And (3) calculating: the desulfurization rate was 8000-52/8000 × 100%, and 99.35%.
Example 3
The components of the smoke are as follows: SO (SO)2The content is 9000m3/kg；
The method for flue gas desulfurization and comprehensive recycling comprises the following steps:
preparing a secondary zinc oxide slurry: the zinc suboxide is obtained from smelting manufacturers and fireworks furnace manufacturers, wherein the mass content of zinc oxide in the zinc suboxide is 55%, and the particle size is 100-150 meshes; mixing the zinc hypoxide with water, filtering, and adding sodium hydroxide to adjust the pH value to obtain zinc hypoxide slurry with the zinc oxide mass concentration of 50% and the pH value of 9;
the secondary zinc oxide slurry is 300m3Spraying at a flow speed of 16.5m/s, and contacting and adsorbing with flue gas at a temperature of 250-300 ℃ to obtain adsorption slurry and primarily purified flue gas;
mixing the adsorption slurry with secondary zinc oxide slurry to obtain regenerated slurry, wherein the pH value of the regenerated slurry is 5.5;
the regeneration slurry is 300m3Spraying at a flow speed of 16.5m/s, and desulfurizing by contacting with the primarily purified flue gas at a temperature of 250-300 ℃ to obtain stable slurry and purified flue gas;
And (3) filter-pressing the stable slurry, wherein the obtained filtrate is used for preparing zinc hypoxide slurry, and the obtained filter residue is used for preparing zinc by electrolysis.
Measuring SO in the purified flue gas2The content is 51m3The desulfurization rate was 99.41% per kg.
And (3) calculating: the desulfurization rate was 9000-53/9000 × 100%, and 99.41%.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A method for flue gas desulfurization and comprehensive recycling is characterized by comprising the following steps:
adsorbing the flue gas by using secondary zinc oxide slurry to obtain primary purified flue gas and adsorption slurry;
mixing the adsorption slurry with secondary zinc oxide slurry to obtain regenerated slurry; desulfurizing the primary purified flue gas by using the regenerated slurry to obtain purified flue gas and stable slurry;
performing filter pressing on the stable slurry, and using the obtained filtrate to prepare secondary zinc oxide slurry; the obtained filter residue is used for preparing zinc by electrolysis;
the pH value of the secondary zinc oxide slurry is 8-9;
the pH value of the regenerated slurry is 5.0-5.8.
2. The method according to claim 1, wherein the mass content of zinc oxide in the secondary zinc oxide slurry is 50-55%.
3. The method according to claim 1 or 2, wherein the mass content of zinc oxide in the zinc hypoxide for the zinc hypoxide slurry is 50 to 55%.
4. The method according to claim 1 or 2, wherein the particle size of the secondary zinc oxide for the secondary zinc oxide slurry is 100 to 150 mesh.
5. The method of claim 1, wherein the secondary zinc oxide slurry adsorbs flue gas in the form of a spray; the spray nozzleThe flow rate of the drenching liquid is 200-300 m3H; the flow velocity of the flue gas is 12-17 m/s.
6. The method according to claim 1 or 5, wherein the temperature of the adsorption is 200 to 300 ℃.
7. The method according to claim 1, wherein the regeneration slurry is used for desulfurizing the primary purified flue gas in the form of spray liquid with the flow velocity of 200-300 m3H; the flow velocity of the primary purified flue gas is 12-17 m/s.
8. The method according to claim 7, wherein the temperature of the desulfurization is 200 to 300 ℃.
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Denomination of invention: A Method for Flue Gas Desulfurization and Comprehensive Recycling Effective date of registration: 20230829 Granted publication date: 20220628 Pledgee: Hunan Luxi Rural Commercial Bank Co.,Ltd. Pledgor: HUNAN XINHAI ENVIRONMENTAL PROTECTION TECHNOLOGY CO.,LTD. Registration number: Y2023980054568 |
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