CN111495141A - Flue gas desulfurization and denitrification process - Google Patents
Flue gas desulfurization and denitrification process Download PDFInfo
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- CN111495141A CN111495141A CN202010369562.9A CN202010369562A CN111495141A CN 111495141 A CN111495141 A CN 111495141A CN 202010369562 A CN202010369562 A CN 202010369562A CN 111495141 A CN111495141 A CN 111495141A
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- flue gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/60—Combinations of devices covered by groups B01D46/00 and B01D47/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/106—Peroxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/606—Carbonates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention discloses a flue gas desulfurization and denitrification process, and belongs to the technical field of flue gas purification. The invention comprises the following steps: introducing industrial exhaust flue gas into a purification tank provided with a filter screen, spraying purified water, and drying the flue gas; introducing the dedusted flue gas into a separation tank provided with a gas detection sensor; introducing the nitrogen oxide separated from the separating tank into a biological pool 1 in which Fe (II) EDTA solution and denitrifying bacteria with good itch are stored for absorption, introducing the sulfur dioxide separated from the separating tank into a biological pool 2 in which desulfurizing bacteria are stored for absorption, collecting the residual nitrogen oxide treated by the biological pool 1 and the residual sulfur dioxide treated by the biological pool 2 into a reaction tank, and treating the residual gas with acid liquor and alkali liquor in the reaction tank for discharge. The invention metabolizes the nitrogen oxide and the sulfur dioxide through the microorganism reaction, the concentration of the sulfide and the nitrogen oxide is very low when the flue gas is discharged, the treatment effect is obvious, and the practicability is good.
Description
Technical Field
The invention relates to the technical field of flue gas purification, in particular to a flue gas desulfurization and denitrification process.
Background
The industrial development promotes the development of social economy, and causes more and more serious pollution to the environment, for example, carbon dioxide discharged by the industry is a main substance causing greenhouse effect, sulfur-containing nitrogen-containing oxides cause acid rain after meeting water, and irreparable consequences are caused to forests and buildings, so that the industrial flue gas needs to be subjected to desulfurization and denitrification treatment and then discharged.
For example, the chinese patent No. 201711048406.7 discloses a flue gas desulfurization and denitration process, which includes: (1) the negative pressure flue gas after dust removal is absorbed by absorption liquid and subjected to primary reaction absorption with the absorption liquid in an absorber; (2) the primary absorption liquid in the step (1) enters an absorption tower to carry out secondary reaction absorption; (3) and (3) returning the absorption liquid at the bottom of the absorption tower to the step (1) and the step (2) for recycling.
Although the process method for desulfurization and denitrification of flue gas can effectively absorb sulfides and nitrogen oxides in the flue gas, the concentrations of the sulfides and the nitrogen oxides in the flue gas are still high during emission, and only a single process of hydrogen peroxide solution is used as an absorbent during treatment, so that the treatment effect is low, the use is inconvenient, and the practicability is poor.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a flue gas desulfurization and denitrification process method, which can be used for treating flue gas through various treatment procedures, and has the advantages of low concentration of sulfide and nitric oxide when the flue gas is discharged, obvious treatment effect, convenient use and good practicability.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a flue gas desulfurization and denitrification process comprises the following specific steps:
the first step is as follows: pretreatment, namely introducing the discharged flue gas into a purification tank for dedusting;
the second step is that: separating, namely separating nitrogen oxides and sulfur dioxide in the clean flue gas;
the third step: biological desulfurization and denitrification, wherein the separated nitrogen oxide and sulfur dioxide are respectively introduced into a biological pond 1 and a biological pond 2 for reaction;
the fourth step: and (3) tail gas treatment, wherein the tail gas treated in the biological pond 1 and the biological pond 2 is collected in a reaction tank for reaction treatment.
As a further scheme of the present invention, the first flue gas pretreatment method comprises: and (3) introducing the flue gas discharged by the industry into a purification tank provided with a filter screen, standing for 1-2 h, spraying with purified water, and drying the flue gas.
As a further scheme of the present invention, the second flue gas separation method comprises: the flue gas after the dust removal lets in the knockout drum that installs gaseous detection sensor, and gaseous detection sensor will detect data transfer and give the controller on the knockout drum, then the controller is adjusted the separation nitrogen oxide and sulfur dioxide to the air outlet valve.
As a further scheme of the invention, the third step of the biological desulfurization and denitrification method comprises the steps of introducing nitrogen oxide separated from a separation tank into a biological pond 1 containing Fe (II) EDTA solution and denitrifying bacteria with good itch for absorption, adjusting the pH to 6.5-8.5 and the temperature to 30-35 ℃, introducing sulfur dioxide separated from the separation tank into a biological pond 2 containing desulfurizing bacteria for absorption, adjusting the pH to 1.8-2.5 and the temperature to 30-35 ℃, wherein the liquid-gas ratio ranges from 12.5L/Nm3～50L/Nm3，Fe3+The concentration range is 1 g/L-6 g/L, and the concentration range of sulfur dioxide is 1000-5000 PPm.
As a further embodiment of the invention, the pH in the biological pond 1 is 7.5 and the temperature is 35 ℃.
As a further scheme of the present invention, the fourth step of tail gas treatment is: and collecting the residual nitrogen oxide treated by the biological pond 1 and the residual sulfur dioxide treated by the biological pond 2 into a reaction tank, and treating the residual gas with acid liquor and alkali liquor in the reaction tank and then discharging.
As a further scheme of the invention, the acid solution is hydrogen peroxide, and the alkali solution is sodium carbonate.
As a further scheme of the invention, the acid liquor and the alkali liquor are sprayed.
As a further scheme of the invention, the hydrogen peroxide is sprayed firstly, and then the sodium carbonate is sprayed.
The invention has the advantages and positive effects that: because the technical scheme is adopted, nitrogen oxide and sulfur dioxide separated from the purified flue gas are respectively introduced into the biological pool 1 and the biological pool 2, the biological pool 1 can easily carry out complexation on the nitrogen oxide and Fe (II) EDTA by using denitrifying bacteria, the biological pool 2 can metabolize and react the sulfur dioxide by using desulfurizing bacteria, and the residual tail gas in the biological pool is intensively treated in the reaction tank again, so that 98 percent of desulfurization in the flue gas and more than 90 percent of denitrification can be ensured, the treatment effect is good, and the practicability is good.
Drawings
FIG. 1 is a flow chart of a flue gas desulfurization and denitrification process of the present invention.
Fig. 2 is a line graph of nox absorption versus temperature.
Figure 3 is a plot of nox absorption versus pH change.
FIG. 4 is a line graph showing the change of the ratio of liquid to gas in the desulfurization rate of sulfur dioxide.
FIG. 5 is Fe3+The concentration versus sulfur dioxide desulfurization rate change line graph.
FIG. 6 is a line graph showing the change in sulfur dioxide concentration versus the desulfurization rate of sulfur dioxide.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in FIG. 1, the flue gas desulfurization and denitration process provided by the invention comprises the following specific steps:
the first step of flue gas pretreatment method is: and (3) introducing the flue gas discharged by the industry into a purification tank provided with a filter screen, standing for 1-2 h, spraying with purified water, and drying the flue gas.
The second step flue gas separation method comprises the following steps: the flue gas after the dust removal lets in the knockout drum that installs gaseous detection sensor, and gaseous detection sensor will detect data transfer and give the controller on the knockout drum, then the controller is adjusted the separation nitrogen oxide and sulfur dioxide to the air outlet valve.
The third step of the biological desulfurization and denitrification method is that the nitrogen oxide separated from the separation tank is introduced into a biological pool 1 containing Fe (II) EDTA solution and denitrifying bacteria with good itch to be absorbed, the pH is adjusted to 6.5-8.5, the temperature range is adjusted to 30-35 ℃, the sulfur dioxide separated from the separation tank is introduced into a biological pool 2 containing desulfurizing bacteria to be absorbed, the pH is adjusted to 1.8-2.5, the temperature range is adjusted to 30-35 ℃, and the liquid-gas ratio range is 12.5L/Nm3～50L/Nm3，Fe3+The concentration range is 1 g/L-6 g/L, the concentration range of sulfur dioxide is 1000-5000 PPm, the pH value in the biological pond 1 is 7.5, and the temperature is 35 ℃.
The fourth step of tail gas treatment comprises the following steps: the residual nitrogen oxide after the treatment in the biological pond 1 and the residual sulfur dioxide after the treatment in the biological pond 2 are converged into a reaction tank filled with hydrogen peroxide and a sodium carbonate solution, the hydrogen peroxide is firstly sprayed into the flue gas in a spraying mode to carry out oxidation reaction on the nitrogen oxide and the sulfur dioxide, and then the sodium carbonate is sprayed into the flue gas to carry out neutralization reaction to generate sodium salt, so that the content of the nitrogen oxide and the content of the sulfur dioxide in the flue gas can be effectively reduced.
Determination of the content of Nitrogen oxides
The effect of varying temperature on nox absorption when PH is constant is shown in table 1:
the results in table 1 and figure 2 show that: when the pH is fixed, the higher the temperature is, the higher the nitrogen oxide absorption rate is, the higher the temperature is, the fluctuation is within 90.3-95.4% in the optimum growth temperature of the microorganism.
The effect of varying PH on nox absorption at a constant temperature is shown in table 2:
the results in table 2 and fig. 3 show that: when the temperature is constant, the higher the pH value is, the higher the nitrogen oxide absorption rate is, the higher the pH value is, the fluctuation is in the range of 90.6-95.7% within the optimum growth pH value of the microorganism.
In conclusion, the absorption rate of the biological pond 1 to the content of nitrogen oxides reaches more than 90 percent
Determination of the Sulfur dioxide content
In the prior art, the thousand-generation field method desulfurization technology is a flue gas desulfurization technology which is widely applied, the optimum growth pH value range of desulfurization bacteria is 1.8-2.5 by taking the thousand-generation field method desulfurization technology as reference, the optimum growth temperature is 30-35 ℃, and the liquid-gas ratio and Fe are researched at present3+The concentration and the influence of the sulfur dioxide concentration on the desulfurization rate of sulfur dioxide.
When Fe3+The effect of changing the liquid-gas ratio on the sulfur dioxide desulfurization rate at a constant concentration and sulfur dioxide concentration is shown in table 3:
table 3 and fig. 4 the results show: when Fe3+When the concentration is constant, the desulfurization rate of sulfur dioxide increases with the increase of the liquid-gas ratio.
When the liquid-gas ratio and the sulfur dioxide concentration are constant, the Fe is changed3+The effect of concentration on sulfur dioxide desulfurization is shown in table 4:
table 4 and fig. 5 results show: when the liquid-gas ratio and the sulfur dioxide concentration are constant, the sulfur dioxide desulfurization rate is along with Fe3+The concentration increases.
When liquid-gas ratio and Fe3+The effect of varying sulfur dioxide concentration on sulfur dioxide desulfurization at a given concentration is shown in table 5:
| 1000 | 2000 | 3000 | 4000 | 5000 | 6000 | |
| thousand generations of field method | 78.6％ | 75.1％ | 73.4％ | 71.2％ | 64.8％ | 61.3％ |
| Method of desulfurizing bacteria | 99.3％ | 99.3％ | 99.3％ | 99.3％ | 99.3％ | 99.3％ |
The results in table 5 and fig. 6 show that: when liquid-gas ratio and Fe3+When the concentration is constant, the desulfurization rate of the sulfur dioxide is not changed by the concentration of the sulfur dioxideChange from chemical to chemical.
In conclusion, the desulfurization rate of the biological pond 2 on sulfur dioxide reaches more than 98%.
Residual flue gas in the biological pond 1 and the biological pond 2 is concentrated and is discharged into the retort, carries out oxidation reaction to residual nitrogen oxide and sulfur dioxide through spraying hydrogen peroxide solution, then sprays out sodium carbonate solution and reacts and obtain the sodium salt, has further reduced nitrogen oxide and sulfur dioxide content in the flue gas, and this technology can effectively carry out desulfurization and denitration treatment to the flue gas, reaches the emission requirement, the environmental protection.
Although specific embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely examples and that many variations or modifications may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims.
Claims (9)
1. A flue gas desulfurization and denitrification process is characterized in that: the method comprises the following specific steps:
the first step is as follows: pretreatment, namely introducing the discharged flue gas into a purification tank for dedusting;
the second step is that: separating, namely separating nitrogen oxides and sulfur dioxide in the clean flue gas;
the third step: biological desulfurization and denitrification, wherein the separated nitrogen oxide and sulfur dioxide are respectively introduced into a biological pond 1 and a biological pond 2 for reaction;
the fourth step: and (3) tail gas treatment, wherein the tail gas treated in the biological pond 1 and the biological pond 2 is collected in a reaction tank for reaction treatment.
2. The flue gas desulfurization and denitrification process according to claim 1, which is characterized in that: the first step flue gas pretreatment method comprises the following steps: and (3) introducing the flue gas discharged by the industry into a purification tank provided with a filter screen, standing for 1-2 h, spraying with purified water, and drying the flue gas.
3. The flue gas desulfurization and denitrification process according to claim 1, which is characterized in that: the second step flue gas separation method comprises the following steps: the flue gas after the dust removal lets in the knockout drum that installs gaseous detection sensor, and gaseous detection sensor will detect data transfer and give the controller on the knockout drum, then the controller is adjusted the separation nitrogen oxide and sulfur dioxide to the air outlet valve.
4. The flue gas desulfurization and denitrification process as claimed in claim 1, wherein the third step of the biological desulfurization and denitrification process comprises the steps of introducing the nitric oxide separated from the separation tank into a biological pond 1 containing Fe (II) EDTA solution and denitrifying bacteria for absorption, adjusting the pH to 6.5-8.5 and the temperature to 30-35 ℃, introducing the sulfur dioxide separated from the separation tank into a biological pond 2 containing desulfurizing bacteria for absorption, adjusting the pH to 1.8-2.5 and the temperature to 30-35 ℃, wherein the liquid-gas ratio ranges from 12.5L/Nm3~50L/Nm3，Fe3+The concentration range is 1 g/L-6 g/L, and the concentration range of sulfur dioxide is 1000-5000 PPm.
5. The flue gas desulfurization and denitrification process according to claim 4, which is characterized in that: the pH in the biological pond 1 was 7.5 and the temperature was 35 ℃.
6. The flue gas desulfurization and denitrification process according to claim 1, which is characterized in that: the fourth step of tail gas treatment comprises the following steps: and collecting the residual nitrogen oxide treated by the biological pond 1 and the residual sulfur dioxide treated by the biological pond 2 into a reaction tank, and treating the residual gas with acid liquor and alkali liquor in the reaction tank and then discharging.
7. The flue gas desulfurization and denitrification process according to claim 6, which is characterized in that: the acid solution is hydrogen peroxide, and the alkali solution is sodium carbonate.
8. The flue gas desulfurization and denitrification process according to claim 6, which is characterized in that: the acid liquor and the alkali liquor are sprayed.
9. The flue gas desulfurization and denitrification process according to any one of claims 6 to 8, which is characterized in that: firstly spraying hydrogen peroxide and then spraying sodium carbonate.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101708415A (en) * | 2009-12-09 | 2010-05-19 | 云南大学 | Method for simultaneously removing sulfur dioxide and nitrogen oxide in exhaust gas by twin tower tandem catalysis-biomembrane packing tower system |
| CN204746092U (en) * | 2015-06-12 | 2015-11-11 | 广州康都环保科技有限公司 | High -efficient gas cleaning equipment of SOx/NOx control |
| KR101876413B1 (en) * | 2017-04-20 | 2018-07-09 | 케이씨코트렐 주식회사 | FLUE GAS TREATMENT APPARATUS FOR REMOVING NOx and SOx SIMULTANEOUSLY |
| CN109589792A (en) * | 2018-12-29 | 2019-04-09 | 北京博奇电力科技有限公司 | A kind of device and method of low temperature wet flue gas denitration |
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2020
- 2020-05-05 CN CN202010369562.9A patent/CN111495141A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101708415A (en) * | 2009-12-09 | 2010-05-19 | 云南大学 | Method for simultaneously removing sulfur dioxide and nitrogen oxide in exhaust gas by twin tower tandem catalysis-biomembrane packing tower system |
| CN204746092U (en) * | 2015-06-12 | 2015-11-11 | 广州康都环保科技有限公司 | High -efficient gas cleaning equipment of SOx/NOx control |
| KR101876413B1 (en) * | 2017-04-20 | 2018-07-09 | 케이씨코트렐 주식회사 | FLUE GAS TREATMENT APPARATUS FOR REMOVING NOx and SOx SIMULTANEOUSLY |
| CN109589792A (en) * | 2018-12-29 | 2019-04-09 | 北京博奇电力科技有限公司 | A kind of device and method of low temperature wet flue gas denitration |
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| 孙墨杰等: "Fe(Ⅱ)EDTA吸收-好氧反硝化菌处理氮氧化物的研究", 《东北电力大学学报》 * |
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Application publication date: 20200807 |