CN114618270A - Containing NOxTail gas normal-temperature denitration device and method - Google Patents
Containing NOxTail gas normal-temperature denitration device and method Download PDFInfo
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- CN114618270A CN114618270A CN202210214741.4A CN202210214741A CN114618270A CN 114618270 A CN114618270 A CN 114618270A CN 202210214741 A CN202210214741 A CN 202210214741A CN 114618270 A CN114618270 A CN 114618270A
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- 238000000034 method Methods 0.000 title claims description 16
- 238000010521 absorption reaction Methods 0.000 claims abstract description 210
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- 230000003584 silencer Effects 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims description 33
- 239000000463 material Substances 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 231100001143 noxa Toxicity 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 5
- 229910002651 NO3 Inorganic materials 0.000 abstract description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 abstract description 3
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 56
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005504 petroleum refining Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- B01D53/14—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 by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- 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
- B01D53/14—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 by absorption
- B01D53/1406—Multiple stage absorption
-
- 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
- B01D53/14—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 by absorption
- B01D53/1412—Controlling the absorption process
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention provides a composition containing NOxThe tail gas normal temperature denitration device comprises a primary absorption tower, a secondary absorption tower, a tail gas compressor, a demineralized water metering pump, a denitration agent metering pump, a primary absorption tower circulating pump, a secondary absorption tower circulating pump, a primary absorption cooler, a secondary absorption heater and a silencer; the tail gas compressor, the demineralized water metering pump and the primary absorption cooler are respectively connected to the bottom, the top and the middle of the primary absorption tower, and an inlet and an outlet of a circulating pump of the primary absorption tower are respectively connected to the primary absorption tower and the primary absorption cooler; the outlet at the top of the primary absorption tower is connected to the inlet at the bottom of the secondary absorption tower; the secondary absorption heater is connected to the top of the secondary absorption tower, and an inlet and an outlet of the circulating pump of the secondary absorption tower are respectively connected to the secondary absorption tower and the secondary absorption heater. The invention solves the problem of tail gas emission, andno nitrate or nitrite is produced.
Description
Technical Field
The invention relates to tail gasThe technical field of denitration, in particular to a denitration catalyst containing NOxAn exhaust gas normal-temperature denitration device and method.
Background
The existing technology for producing NO-containing concentrated nitric acid in fine chemical and petroleum refining enterprisesxThe tail gas emission needs to be treated, and the tail gas is characterized in that: normal temperature, unstable flow, NOxHigh content (up to 50000 mg/Nm)3) With NO2Mainly, the NO in the tail gas is required according to the environmental protection standardxThe emission content is not more than 100mg/Nm3。
For low concentration of NOxThe conventional method selectively catalytic reduction SCR denitration technology and ozone denitration technology, but for high-concentration NO-containing tail gasxThe denitration efficiency of the tail gas is obviously insufficient, and the tail gas cannot be discharged up to the standard. And for the chemical absorption method, such as the absorption by alkali liquor, the secondary pollution problem of the sewage discharge of nitrate or nitrite is generated.
Therefore, it is urgently required to develop a NO-containing compoundxThe tail gas normal temperature denitration device can not generate secondary pollution while solving the problem of tail gas purification and emission efficiency, and has low operation cost.
Disclosure of Invention
In view of the above technical problems in the prior art, the present invention provides a method for producing a NO-containing materialxThe tail gas normal-temperature denitration device and the method have the advantages of realizing the tail gas purification and emission efficiency, avoiding secondary pollution and being low in operation cost.
The technical means adopted by the invention are as follows:
containing NOxThe tail gas normal-temperature denitration device comprises a primary absorption tower, a secondary absorption tower, a tail gas compressor, a demineralized water metering pump, a denitration agent metering pump, a primary absorption tower circulating pump, a secondary absorption tower circulating pump, a primary absorption cooler, a secondary absorption heater and a silencer;
the tail gas compressor, the demineralized water metering pump and the primary absorption cooler are respectively connected to the bottom, the top and the middle part of the primary absorption tower, and the circulating pump of the primary absorption towerAn inlet and an outlet are respectively connected to the primary absorption tower and the primary absorption cooler; the tail gas compressor is used for conveying NO to the primary absorption towerxTail gas; the demineralized water metering pump is used for conveying demineralized water to the primary absorption tower; the primary absorption tower circulating pump is used for collecting circulating liquid in the primary cooling tower and conveying the circulating liquid to the primary absorption cooler, and the primary absorption cooler is used for conveying the circulating liquid to the middle part of the primary absorption tower;
the outlet at the top of the primary absorption tower is connected to the inlet at the bottom of the secondary absorption tower;
the secondary absorption heater is connected to the top of the secondary absorption tower, an inlet and an outlet of a circulating pump of the secondary absorption tower are respectively connected to the secondary absorption tower and the secondary absorption heater, and the silencer is arranged on the top of the secondary absorption tower; the denitration agent metering pump is connected with an inlet of the secondary absorption tower circulating pump; and the secondary absorption tower circulating pump is used for conveying the collected circulating liquid in the secondary absorption tower and the denitration agent conveyed by the denitration agent metering pump to the secondary absorption heater, and the secondary absorption heater is used for conveying the circulating liquid containing the denitration agent to the secondary absorption tower.
Further, the tail gas compressor adopts a water ring compressor.
Further, the tail gas compressor is used for controlling NO contentxNO in tail gasxThe content is 2-4% and the pressure is 4-6 barg.
Further, bubble cap trays are adopted in the primary absorption tower and the secondary absorption tower.
Further, the cooling medium in the primary absorption cooler is chilled water.
Furthermore, the first-stage absorption tower, the second-stage absorption tower, the first-stage absorption tower circulating pump, the second-stage absorption tower circulating pump, the first-stage absorption cooler and the second-stage absorption heater are all made of 316L stainless steel.
Further, the outlet temperature of the primary absorption cooler is set to be 15-25 ℃, and the outlet temperature of the secondary absorption heater is set to be 70-90 ℃.
The invention also provides a composition containing NOxThe tail gas normal temperature denitration method adopts the NO-containingxThe tail gas normal temperature denitrification facility specifically comprises the following steps:
NO-containing pressurized by tail gas compressorxIntroducing tail gas into the bottom of the primary absorption tower, spraying demineralized water into the primary absorption tower in a countercurrent way through a demineralized water metering pump, collecting circulating liquid in the primary absorption tower through a circulating pump of the primary absorption tower, spraying the circulating liquid into the primary absorption tower in a countercurrent way through a primary absorption cooler, and carrying out primary absorption by reversely contacting the tail gas, the demineralized water and the circulating liquid in the primary absorption tower;
the residual tail gas after the primary absorption is introduced into the bottom of the secondary absorption tower from the outlet at the top of the primary absorption tower, the circulating liquid in the secondary absorption tower is collected by a circulating pump of the secondary absorption tower, and is introduced into a secondary absorption heater together with the denitrifier conveyed by the denitrifier metering pump to be heated and heated, and then is introduced from the top of the secondary absorption tower, the tail gas is reversely contacted with the denitrifier and the circulating liquid in the secondary absorption tower to carry out secondary absorption, and the residual tail gas is finally reduced into N2And is discharged to the atmosphere through a silencer.
Compared with the prior art, the invention has the following advantages:
the invention provides a composition containing NOxThe tail gas normal temperature denitration device and method solves the problem of tail gas emission, and NO in the tail gasXThe discharge content can reach 100mg/Nm3The method has the advantages that the secondary pollution problem of sewage discharge of nitrate or nitrite is not generated.
Based on the reasons, the method can be widely popularized in the fields of tail gas denitration and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a denitration apparatus according to the present invention.
In the figure: 1. a first-stage absorption tower; 2. a secondary absorption tower; 3. a tail gas compressor; 4. a demineralized water metering pump; 5. a denitrifier metering pump; 6. a first-stage absorption tower circulating pump; 7. a second-stage absorption tower circulating pump; 8. a primary absorption cooler; 9. a secondary absorption heater; 10. a silencer.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … … surface," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.
Example 1
As shown in FIG. 1, the present invention provides a composition containing NOxThe tail gas normal-temperature denitration device comprises a primary absorption tower 1, a secondary absorption tower 2, a tail gas compressor 3, a demineralized water metering pump 4, a denitration agent metering pump 5, a primary absorption tower circulating pump 6, a secondary absorption tower circulating pump 7, a primary absorption cooler 8, a secondary absorption heater 9 and a silencer 10;
the tail gas compressor 3, the demineralized water metering pump 4 and the primary absorption cooler 8 are respectively connected to the bottom, the top and the middle of the primary absorption tower 1, and the inlet and the outlet of the primary absorption tower circulating pump 6 are respectively connected to the primary absorption tower 1 and the primary absorption cooler 8; the tail gas compressor 3 is used for conveying NO-containing gas to the primary absorption tower 1xTail gas; the demineralized water metering pump 4 is used for conveying demineralized water to the primary absorption tower 1; the primary absorption tower circulating pump 6 is used for collecting circulating liquid in the primary cooling tower 1 and conveying the circulating liquid to the primary absorption cooler 8, and the primary absorption cooler 8 is used for conveying the circulating liquid to the middle part of the primary absorption tower 1;
the outlet at the top of the primary absorption tower 1 is connected to the inlet at the bottom of the secondary absorption tower 2;
the secondary absorption heater 9 is connected to the top of the secondary absorption tower 2, the inlet and the outlet of the circulating pump 7 of the secondary absorption tower are respectively connected to the secondary absorption tower 2 and the secondary absorption heater 9, and the silencer 10 is installed on the top of the secondary absorption tower 2; the denitration agent metering pump 5 is connected with an inlet of the second-stage absorption tower circulating pump 7; the secondary absorption tower circulating pump 7 is used for conveying the collected circulating liquid in the secondary absorption tower 2 and the denitrating agent conveyed by the denitrating agent metering pump 5 to the secondary absorption heater 9, and the secondary absorption heater 9 is used for conveying the circulating liquid containing the denitrating agent to the secondary absorption tower 2.
Further, the tail gas compressor 3 adopts a water ring compressor.
Further, the tail gas compressor 3 is used for controlling the content of NOxNO in tail gasxThe content is 2-4% and the pressure is 4-6 barg.
Further, bubble cap trays are adopted in the primary absorption tower 1 and the secondary absorption tower 2.
Further, the cooling medium in the primary absorption cooler 8 is chilled water.
Further, the material of the primary absorption tower 1, the secondary absorption tower 2, the primary absorption tower circulating pump 6, the secondary absorption tower circulating pump 7, the primary absorption cooler 8 and the secondary absorption heater 9 is 316L stainless steel.
Further, the outlet temperature of the primary absorption cooler 8 is set to be 15-25 ℃, and the outlet temperature of the secondary absorption heater 9 is set to be 70-90 ℃.
Further, the circulating liquid is a dilute nitric acid solution, and the mass concentration is 1-3 wt%.
The invention also provides a composition containing NOxThe tail gas normal temperature denitration method adopts the NO-containingxThe tail gas normal temperature denitrification facility specifically comprises the following steps:
NO-containing pressurized by tail gas compressor 3xIntroducing tail gas into the bottom of a primary absorption tower 1, spraying desalted water into the primary absorption tower 1 in a countercurrent manner through a desalted water metering pump 4, collecting circulating liquid in the primary absorption tower 1 through a primary absorption tower circulating pump 6, spraying the circulating liquid into the primary absorption tower 1 in a countercurrent manner through a primary absorption cooler 8, and carrying out primary absorption by reversely contacting the tail gas with the desalted water and the circulating liquid in the primary absorption tower 1;
NO in pressurized exhaust gas2Reversely contacts with desalted water and circulating liquid in a first-stage absorption tower 1 to generateNitric acid reacts with NO, which then reacts with excess air oxygen in the exhaust to form NO2This is repeated and circulated because of NO2The reaction with water and the reaction of NO with oxygen are exothermic, in order to ensure NOxThe removal rate is that the device is provided with a primary absorption cooler 8 of a pressurized cooling device, and the generated dilute nitric acid can be discharged from a facility for recycling after primary absorption;
the reactions that occur during the first-order absorption are as follows:
3NO2+H2O→2HNO3+NO (1)
2NO+O2→2NO2 (2)
in order to reach the standard emission of tail gas and meet the requirement of NO in the tail gasxThe discharge content can reach 100mg/Nm3The invention also sets up a secondary absorption; the surplus tail gas after carrying out the one-level absorption lets in 2 bottoms on second grade absorption tower by 1 top export on first-level absorption tower, collect the circulation liquid in second grade absorption tower 2 through second grade absorption tower circulating pump 7 and let in second grade absorption heater 9 with the denitrifier that denitrifier metering pump carried together and heat up, then let in by 2 tops on second grade absorption tower, tail gas and denitrifier and circulation liquid reverse contact carry out the second grade absorption in second grade absorption tower 2, surplus tail gas is finally reduced to N2And is discharged into the atmosphere through a silencer 10;
residual NO in the residual tail gasxBy reaction with denitrating agents, NOxReducing the nitrogen into nitrogen; the denitration redox reaction is an endothermic reaction, so a secondary absorption heater 9 is arranged to heat and raise the temperature of the circulating liquid and the denitration agent;
the reactions that occur during secondary absorption are as follows:
NO2+ NO + denitrifier → N2+CO2+H2O (3)。
To treat 150Nm3H containing NOx2% (mol) of tail gas is taken as an example, when the denitration device and method provided by the invention and the SCR denitration technology are adopted for tail gas treatment, the corresponding technical and economic indexes are compared as shown in the following table:
TABLE 1 comparison of the technical and economic indicators of the inventive apparatus and process with those of SCR denitration technology
The denitration device and the denitration method provided by the invention can achieve standard emission, and the investment and operation cost is lower than that of SCR denitration technology.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. Containing NOxThe tail gas normal-temperature denitration device is characterized by comprising a primary absorption tower, a secondary absorption tower, a tail gas compressor, a demineralized water metering pump, a denitration agent metering pump, a primary absorption tower circulating pump, a secondary absorption tower circulating pump, a primary absorption cooler, a secondary absorption heater and a silencer;
the tail gas compressor, the demineralized water metering pump and the primary absorption cooler are respectively connected to the bottom, the top and the middle of the primary absorption tower, and an inlet and an outlet of a circulating pump of the primary absorption tower are respectively connected to the primary absorption tower and the primary absorption cooler; the tail gas compressor is used for conveying NO-containing gas to the primary absorption towerxTail gas; the demineralized water metering pump is used for conveying demineralized water to the primary absorption tower; the primary absorption tower circulating pump is used for collecting circulating liquid in the primary cooling tower and conveying the circulating liquid to the primary absorption cooler, and the primary absorption cooler is used for conveying the circulating liquid to the middle part of the primary absorption tower;
the outlet at the top of the primary absorption tower is connected to the inlet at the bottom of the secondary absorption tower;
the secondary absorption heater is connected to the top of the secondary absorption tower, an inlet and an outlet of a circulating pump of the secondary absorption tower are respectively connected to the secondary absorption tower and the secondary absorption heater, and the silencer is arranged on the top of the secondary absorption tower; the denitration agent metering pump is connected with an inlet of the secondary absorption tower circulating pump; and the secondary absorption tower circulating pump is used for conveying the collected circulating liquid in the secondary absorption tower and the denitration agent conveyed by the denitration agent metering pump to the secondary absorption heater, and the secondary absorption heater is used for conveying the circulating liquid containing the denitration agent to the secondary absorption tower.
2. The NO-containing of claim 1xThe tail gas normal temperature denitrification facility is characterized in that the tail gas compressor adopts a water ring compressor.
3. The NO-containing of claim 2xThe tail gas normal temperature denitration device is characterized in that the tail gas compressor is used for controlling NO contentxNO in tail gasxThe content is 2-4% and the pressure is 4-6 barg.
4. The NO-containing of claim 1xThe tail gas normal-temperature denitration device is characterized in that bubble cap trays are adopted in the primary absorption tower and the secondary absorption tower.
5. The NO-containing of claim 1xThe tail gas normal temperature denitration device is characterized in that cooling medium in the primary absorption cooler is chilled water.
6. The NO-containing of claim 1xThe tail gas normal temperature denitrification device is characterized in that the material of the primary absorption tower, the material of the secondary absorption tower, the material of the primary absorption tower circulating pump, the material of the secondary absorption tower circulating pump, the material of the primary absorption cooler and the material of the secondary absorption heater are 316L stainless steel.
7. The NO-containing of claim 1xThe tail gas normal temperature denitration device is characterized in that the outlet temperature of the primary absorption cooler is set to be 15-25 ℃, and the outlet temperature of the secondary absorption heater is set to be 70-90 ℃.
8. Containing NOxA method for denitration of exhaust gas at normal temperature, characterized in that the NO-containing NOx described in any one of claims 1 to 7 is usedxThe tail gas normal temperature denitrification facility specifically comprises the following steps:
NO-containing pressurized by tail gas compressorxIntroducing tail gas into the bottom of the primary absorption tower, spraying demineralized water into the primary absorption tower in a countercurrent mode through a demineralized water metering pump, collecting circulating liquid in the primary absorption tower through a circulating pump of the primary absorption tower, spraying the circulating liquid into the primary absorption tower in a countercurrent mode through a primary absorption cooler, and enabling the tail gas, the demineralized water and the circulating liquid to reversely contact in the primary absorption tower to perform primary absorption;
the residual tail gas after the primary absorption is introduced into the bottom of the secondary absorption tower from the outlet at the top of the primary absorption tower, the circulating liquid in the secondary absorption tower is collected by a circulating pump of the secondary absorption tower, and is introduced into a secondary absorption heater together with the denitrifier conveyed by the denitrifier metering pump to be heated and heated, and then is introduced from the top of the secondary absorption tower, the tail gas is reversely contacted with the denitrifier and the circulating liquid in the secondary absorption tower to carry out secondary absorption, and the residual tail gas is finally reduced into N2And is discharged to the atmosphere through a silencer.
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| CN202210214741.4A CN114618270A (en) | 2022-03-07 | 2022-03-07 | Containing NOxTail gas normal-temperature denitration device and method |
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| CN202210214741.4A CN114618270A (en) | 2022-03-07 | 2022-03-07 | Containing NOxTail gas normal-temperature denitration device and method |
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| CN214680967U (en) * | 2021-04-16 | 2021-11-12 | 中国海洋石油集团有限公司 | Nitrogen oxide waste gas resourceful treatment device |
| CN113941225A (en) * | 2021-10-12 | 2022-01-18 | 成都信息工程大学 | Resource method for improving nitric acid dissolved metal tail gas |
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