CN116764419A - Wet flue gas desulfurization and denitrification method - Google Patents
Wet flue gas desulfurization and denitrification method Download PDFInfo
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- CN116764419A CN116764419A CN202310941176.6A CN202310941176A CN116764419A CN 116764419 A CN116764419 A CN 116764419A CN 202310941176 A CN202310941176 A CN 202310941176A CN 116764419 A CN116764419 A CN 116764419A
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- desulfurization
- flue gas
- denitrification
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 89
- 230000023556 desulfurization Effects 0.000 title claims abstract description 89
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 239000003546 flue gas Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 63
- 239000000243 solution Substances 0.000 claims abstract description 48
- 238000006243 chemical reaction Methods 0.000 claims abstract description 31
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 30
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 24
- 235000019738 Limestone Nutrition 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims abstract description 12
- 239000006028 limestone Substances 0.000 claims abstract description 12
- 239000002002 slurry Substances 0.000 claims abstract description 12
- 239000007800 oxidant agent Substances 0.000 claims abstract description 11
- 230000001590 oxidative effect Effects 0.000 claims abstract description 11
- 239000007787 solid Substances 0.000 claims abstract description 11
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 10
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 10
- 238000002347 injection Methods 0.000 claims abstract description 10
- 239000007924 injection Substances 0.000 claims abstract description 10
- 239000000047 product Substances 0.000 claims abstract description 8
- 230000007613 environmental effect Effects 0.000 claims abstract description 7
- 239000013067 intermediate product Substances 0.000 claims abstract description 6
- 238000000746 purification Methods 0.000 claims abstract description 6
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000005507 spraying Methods 0.000 claims abstract description 4
- 238000000926 separation method Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000002351 wastewater Substances 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 7
- 238000004064 recycling Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 5
- 238000005457 optimization Methods 0.000 claims description 5
- 238000001704 evaporation Methods 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000001556 precipitation Methods 0.000 claims description 4
- 230000001737 promoting effect Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 238000004065 wastewater treatment Methods 0.000 abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 229910052602 gypsum Inorganic materials 0.000 description 5
- 239000010440 gypsum Substances 0.000 description 5
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 2
- 150000003568 thioethers Chemical class 0.000 description 2
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 description 1
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Abstract
The invention discloses a wet flue gas desulfurization and denitrification method, which comprises the following steps: introducing the flue gas into a desulfurization and denitrification device; injecting a desulfurizing agent and a denitrifying agent into the flue gas in a desulfurization and denitrification device in a spraying mode; the sulfide and the nitrogen oxide in the flue gas are converted into corresponding solution or solid matters through desulfurization and denitrification reaction, and the solution or the solid matters are separated; according to the wet flue gas desulfurization and denitrification method provided by the invention, limestone slurry is used as a desulfurizing agent and ammonia water solution is used as a denitrifying agent in the desulfurization and denitrification process, the limestone slurry is injected through the multi-stage sprayer, so that a high-efficiency reaction effect is realized, the unreacted desulfurizing and denitrification agent is recycled, a stable product or intermediate product is obtained through concentration treatment and the treated solution, and meanwhile, the characteristics of wastewater treatment, an oxidant injection system, real-time monitoring and adjustment and the like are also considered in the device, so that the desulfurization and denitrification device can reach the environmental emission standard, and the stable and high-efficiency flue gas purification effect is realized.
Description
Technical Field
The invention relates to the technical field of flue gas treatment, in particular to a wet flue gas desulfurization and denitrification method.
Background
At present, sulfides and nitrogen oxides in flue gas are one of the main sources of atmospheric environmental pollution, and cause serious harm to air quality and human health. Therefore, developing a high-efficiency flue gas desulfurization and denitrification method has important significance.
The traditional wet flue gas desulfurization and denitrification method mainly adopts limestone slurry and ammonia water solution as desulfurizing agents and denitrifying agents. However, the conventional method has problems such as: the solution contains a large amount of water, so that the desulfurization and denitrification product is diluted; the reaction efficiency is low in the desulfurization and denitrification process; the recycling rate of the desulfurizing agent and the denitrifying agent is low; further treatment of the wastewater discharge is required, etc.
Disclosure of Invention
The invention provides a wet flue gas desulfurization and denitrification method for solving the problems.
In order to solve the technical problems, the technical scheme of the invention is as follows: a wet flue gas desulfurization and denitrification method comprises the following steps:
a. introducing the flue gas into a desulfurization and denitrification device;
b. injecting a desulfurizing agent and a denitrifying agent into the flue gas in a desulfurization and denitrification device in a spraying mode;
c. the sulfide and the nitrogen oxide in the flue gas are converted into corresponding solution or solid matters through desulfurization and denitrification reaction, and the solution or the solid matters are separated;
d. in the separation step, the resulting solution is subjected to a concentration treatment comprising the sub-steps of:
i. introducing the solution into a concentration unit, and removing moisture from the solution by evaporation or membrane separation;
concentrating and heating the concentrated solution with the water removed to a certain concentration;
mixing the concentrated solution with fresh desulfurizing agent and denitrifying agent to recover and reuse unreacted desulfurizing and denitrifying agent;
treating the recovered desulfurization and denitrification agent to remove impurities, and re-supplying the impurities to a desulfurization and denitrification device for use;
and v, carrying out corresponding treatment on the concentrated solution to obtain a stable product or intermediate product, and recycling or carrying out safe treatment.
Further, the desulfurizing agent is limestone slurry.
Further, the denitrification agent is an ammonia water solution.
Furthermore, the desulfurizing agent and the denitrifying agent are injected through a multi-stage sprayer, so that the reaction efficiency is improved.
Furthermore, a circulating liquid storage and supply system is arranged in the desulfurization and denitrification device, so that fresh desulfurizing agent and denitrifying agent can be continuously supplied.
Further, the separation step adopts a precipitation and filtration mode to separate the converted solution or solid from the flue gas.
Further, the method also comprises the step of treating and purifying the discharged wastewater in the desulfurization device so as to reach the environmental emission standard.
Further, the desulfurization and denitrification device also comprises an oxidant injection system for promoting desulfurization and denitrification reaction.
Further, in the desulfurization and denitrification reaction process, the reaction conditions can be monitored and regulated in real time through a sensor and a control system, so that the stability and optimization of the desulfurization and denitrification effect are ensured.
Compared with the prior art, the invention has the advantages that:
1) And (3) efficiently removing pollutants: the limestone slurry and the ammonia water solution are used as a desulfurizing agent and a denitrifying agent, so that sulfides and nitrogen oxides in the flue gas can be effectively removed, and the limestone slurry can react with sulfur dioxide in the flue gas to generate gypsum, so that the gypsum is removed from the flue gas; the ammonia water solution can react with nitrogen oxides in the flue gas to generate nitrogen and water, and the wet desulfurization and denitrification method can remarkably reduce the pollutant content in the flue gas and reduce the atmospheric pollution.
2) The reaction efficiency is improved: the multi-stage sprayer is used for injecting the desulfurizing agent and the denitrifying agent, so that the contact area can be increased, the full mixing and the reaction of the reaction substances are promoted, the reaction efficiency can be improved, the time and the device scale required by the desulfurization and denitrification reaction are reduced, and the process cost is reduced.
3) Recycling desulfurizing agent and denitrifying agent: the circulating liquid storage and supply system is arranged, so that the concentrated desulfurization and denitrification solution can be mixed with fresh desulfurization and denitrification agents to recycle unreacted desulfurization and denitrification agents, and the recycled desulfurization and denitrification agents can be supplied to the desulfurization and denitrification device again for use through reasonable treatment and purification, so that the utilization efficiency of resources is improved.
4) High-efficiency stable separation process: the separation step adopts modes of precipitation, filtration and the like, can separate the converted solution or solid from the flue gas, can obtain stable desulfurization and denitrification products or intermediate products through an effective separation process, and can be recycled or safely treated.
5) Wastewater treatment and purification: the wet desulfurization and denitrification method also comprises the steps of treating and purifying the discharged wastewater in the desulfurization device, and can remove or reduce harmful substances in the wastewater to a level conforming to the environmental emission standard by adopting a proper wastewater treatment technology, thereby reducing the negative influence on the environment.
6) Oxidant injection system: the desulfurization and denitrification device further comprises an oxidant injection system, and can inject an oxidant into the reaction process to promote desulfurization and denitrification reaction, improve desulfurization and denitrification effects and further reduce pollutant emission.
7) Real-time monitoring and adjustment: the reaction conditions are monitored and regulated in real time through the sensor and the control system, so that the stability and optimization of the desulfurization and denitrification effect can be ensured, and the operation parameters of the desulfurization and denitrification device can be timely regulated according to the monitored data, so that the optimal desulfurization and denitrification effect can be achieved.
Detailed Description
The present invention will be described in further detail with reference to examples.
The embodiment provides a wet flue gas desulfurization and denitrification method, which sequentially and in detail comprises the following steps:
step a: and introducing the flue gas into a desulfurization and denitrification device.
Introducing the coal-fired flue gas into a desulfurization and denitrification device through an induced draft fan.
Step b: in the desulfurization and denitrification device, a desulfurizing agent and a denitrifying agent are injected into the flue gas in a spraying mode.
The desulfurization and denitrification device is provided with a multi-stage sprayer, and limestone slurry serving as a desulfurizing agent and an ammonia water solution serving as a denitrifying agent are sequentially injected into the flue gas.
Step c: the sulfide and the nitrogen oxide in the flue gas are converted into corresponding solutions or solids through desulfurization and denitrification reactions, and are separated.
In the desulfurization and denitrification reaction process, limestone slurry reacts with sulfur dioxide in the flue gas to generate gypsum, and ammonia water solution reacts with nitrogen oxides in the flue gas to generate nitrogen and water vapor. The gypsum and nitrogen produced are separated from the flue gas by washing and filtering.
Step d: in the separation step, the resulting solution is subjected to concentration treatment.
i. The solution is introduced into a concentration unit, and water is removed from the solution by evaporation or membrane separation methods.
Introducing the obtained solution into an evaporator or a membrane separator after passing through a preheater, and removing water in the solution through evaporation or membrane separation to obtain concentrated liquid.
And ii, concentrating and heating the concentrated solution after removing the water to a certain concentration.
Introducing the concentrated solution into a heating device, and further removing water in the solution under the action of heating to reach the required concentration.
Mixing the concentrated solution with fresh desulfurizing agent and denitrifying agent to recover and reuse unreacted desulfurizing and denitrifying agent.
The concentrated solution is mixed with fresh limestone slurry and aqueous ammonia solution to recover and reuse unreacted desulfurizing and denitrifying agents therein.
And iv, treating the recovered desulfurization and denitrification agent to remove impurities, and re-supplying the recovered desulfurization and denitrification agent to a desulfurization and denitrification device for use.
The recovered desulfurizing agent and denitrifying agent are filtered, dehydrated and the like to remove impurities in the desulfurizing agent and denitrifying agent, and then the desulfurizing agent and denitrifying agent are supplied to a desulfurization and denitrification device again for use.
And v, carrying out corresponding treatment on the concentrated solution to obtain a stable product or intermediate product, and recycling or carrying out safe treatment.
The concentrated solution is treated to provide a stable product or intermediate, such as gypsum or other solid residue, which can be recycled or safely disposed of.
In addition, the wet flue gas desulfurization and denitrification device also has the following characteristics:
step e: and (3) treating and purifying the discharged wastewater in the desulfurization device to reach the environmental emission standard.
And collecting the wastewater generated in the desulfurization and denitrification device, removing pollutants and impurities in the wastewater through treatment steps of precipitation, filtration, adsorption and the like, so that the wastewater reaches the environmental emission standard, and protecting a water source and the ecological environment.
Step f: the desulfurization and denitrification device also comprises an oxidant injection system for promoting desulfurization and denitrification reaction.
An oxidant injection system is arranged in the desulfurization and denitrification device, and the reaction oxidizing property is increased by injecting an oxidant into the flue gas, so that the desulfurization and denitrification reaction is promoted, and the reaction efficiency and the purification effect are improved.
Step g: in the desulfurization and denitrification reaction process, the reaction conditions can be monitored and regulated in real time through a sensor and a control system so as to ensure the stability and optimization of desulfurization and denitrification effects.
By arranging the sensor and the control system, key parameters such as temperature, pressure, pH value and the like in the desulfurization and denitrification reaction process are monitored in real time, and the injection quantity of the desulfurizing agent and the denitrifying agent, the injection quantity of the oxidizing agent and the like are automatically regulated according to the monitoring result, so that the stability and the optimization of the desulfurization and denitrification effect are ensured.
In summary, in the wet flue gas desulfurization and denitrification method provided by the embodiment, limestone slurry is used as a desulfurizing agent and ammonia water solution is used as a denitrifying agent in the desulfurization and denitrification process, and the limestone slurry is injected through a multi-stage sprayer, so that the efficient reaction effect is realized. And the solution after concentration treatment and treatment is subjected to recycling of unreacted desulfurization and denitrification agents to obtain a stable product or intermediate product. Meanwhile, the characteristics of wastewater treatment, oxidant injection system, real-time monitoring and adjustment and the like are also considered in the device, so that the desulfurization and denitrification device can reach the environmental emission standard, and the stable and efficient flue gas purification effect is realized.
The invention and its embodiments have been described above with no limitation, but the examples shown are only one of the embodiments of the invention, and the actual structure is not limited thereto. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution should not be creatively devised without departing from the gist of the present invention.
Claims (9)
1. The wet flue gas desulfurization and denitrification method is characterized by comprising the following steps of:
a. introducing the flue gas into a desulfurization and denitrification device;
b. injecting a desulfurizing agent and a denitrifying agent into the flue gas in a desulfurization and denitrification device in a spraying mode;
c. the sulfide and the nitrogen oxide in the flue gas are converted into corresponding solution or solid matters through desulfurization and denitrification reaction, and the solution or the solid matters are separated;
d. in the separation step, the resulting solution is subjected to a concentration treatment comprising the sub-steps of:
i. introducing the solution into a concentration unit, and removing moisture from the solution by evaporation or membrane separation;
concentrating and heating the concentrated solution with the water removed to a certain concentration;
mixing the concentrated solution with fresh desulfurizing agent and denitrifying agent to recover and reuse unreacted desulfurizing and denitrifying agent;
treating the recovered desulfurization and denitrification agent to remove impurities, and re-supplying the impurities to a desulfurization and denitrification device for use;
and v, carrying out corresponding treatment on the concentrated solution to obtain a stable product or intermediate product, and recycling or carrying out safe treatment.
2. The wet flue gas desulfurization and denitration method according to claim 1, wherein the method comprises the following steps: the desulfurizing agent is limestone slurry.
3. The wet flue gas desulfurization and denitration method according to claim 1, wherein the method comprises the following steps: the denitrification agent is ammonia water solution.
4. The wet flue gas desulfurization and denitration method according to claim 1, wherein the method comprises the following steps: the desulfurizing agent and the denitrifying agent are injected through a multi-stage sprayer, so that the reaction efficiency is improved.
5. The wet flue gas desulfurization and denitration method according to claim 1, wherein the method comprises the following steps: the desulfurization and denitrification device is provided with a circulating liquid storage and supply system, so that fresh desulfurizing agent and denitrifying agent can be continuously supplied.
6. The wet flue gas desulfurization and denitration method according to claim 1, wherein the method comprises the following steps: the separation step adopts modes of precipitation, filtration and the like to separate the converted solution or solid from the flue gas.
7. The wet flue gas desulfurization and denitration method according to claim 1, wherein the method comprises the following steps: further comprises the treatment and purification of the discharged wastewater in the desulfurization device to reach the environmental emission standard.
8. The wet flue gas desulfurization and denitration method according to claim 1, wherein the method comprises the following steps: the desulfurization and denitrification device also comprises an oxidant injection system for promoting desulfurization and denitrification reaction.
9. The wet flue gas desulfurization and denitration method according to claim 1, wherein the method comprises the following steps: in the desulfurization and denitrification reaction process, the reaction conditions can be monitored and regulated in real time through a sensor and a control system so as to ensure the stability and optimization of desulfurization and denitrification effects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310941176.6A CN116764419A (en) | 2023-07-28 | 2023-07-28 | Wet flue gas desulfurization and denitrification method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310941176.6A CN116764419A (en) | 2023-07-28 | 2023-07-28 | Wet flue gas desulfurization and denitrification method |
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| Publication Number | Publication Date |
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| CN116764419A true CN116764419A (en) | 2023-09-19 |
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| CN202310941176.6A Pending CN116764419A (en) | 2023-07-28 | 2023-07-28 | Wet flue gas desulfurization and denitrification method |
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| CN (1) | CN116764419A (en) |
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- 2023-07-28 CN CN202310941176.6A patent/CN116764419A/en active Pending
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