CN113509820A - Method for preparing acid by concentrating nitrogen oxide by zeolite rotating wheel and washing and absorbing nitrogen oxide - Google Patents
Method for preparing acid by concentrating nitrogen oxide by zeolite rotating wheel and washing and absorbing nitrogen oxide Download PDFInfo
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- CN113509820A CN113509820A CN202110863672.5A CN202110863672A CN113509820A CN 113509820 A CN113509820 A CN 113509820A CN 202110863672 A CN202110863672 A CN 202110863672A CN 113509820 A CN113509820 A CN 113509820A
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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
- B01D53/02—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 adsorption, e.g. preparative gas chromatography
- B01D53/06—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 adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
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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
- 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
- B01D53/76—Gas phase processes, e.g. by using aerosols
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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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3441—Regeneration or reactivation by electric current, ultrasound or irradiation, e.g. electromagnetic radiation such as X-rays, UV, light, microwaves
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
- C01B21/38—Nitric acid
- C01B21/40—Preparation by absorption of oxides of nitrogen
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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
- B01D2251/104—Ozone
Abstract
The invention relates to a method for preparing acid by concentrating nitrogen oxide by a zeolite rotating wheel and washing and absorbing the nitrogen oxide by water, which comprises the following steps: adsorbing nitrogen oxides in the flue gas on an adsorption material of a denitration runner, and treating the flue gas emission up to the standard; transferring to a microwave regeneration zone, resolving out nitrogen oxides, introducing air from a cooling zone into the microwave regeneration zone, and taking out the separated nitrogen oxides from the microwave regeneration zone; nitrogen oxides, and O, carried over from the microwave regeneration zone3And H2Mixing and reacting O to generate nitric acid, and conveying the generated nitric oxide to an adsorption area for adsorption; transferring to a cooling area, and cooling the adsorbing material of the denitration rotating wheel to room temperature by air introduced from the cooling area; and (4) transferring to an adsorption area, adsorbing the nitrogen oxide in the flue gas by the cooled adsorption material of the denitration runner, and circulating in this way. The method overcomes the problems of large consumption of adsorbing materials and large occupied space of fixed bed equipment in a fixed bed nitrogen oxide adsorption method; the problem of high added value utilization of nitrogen resources is solved.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a method for preparing acid by concentrating nitrogen oxide by a zeolite rotating wheel and washing and absorbing the nitrogen oxide by water.
Background
Nitrogen oxides can form acid rain and acid mist; forming photochemical smog with hydrocarbon; participate in destroying the ozone layer and the like, and cause great harm to the ecological environment and human health. Although NOx industrial emission abatement has achieved some success at present. Low concentration NOx abatement in ambient air still lacks an effective means.
The main denitration technologies at the present stage are a Selective Catalytic Reduction (SCR) denitration technology and a selective non-catalytic reduction (SNCR) denitration technology. The SCR denitration technology has the advantages of high denitration efficiency, but has obvious defects, certain requirements on the concentration of an NOx inlet are met, and the catalyst is greatly influenced by acid gases such as sulfur dioxide and the like and must be desulfurized and then denitrated. The SNCR denitration technology has the advantages of simple process and low investment, but the SNCR denitration technology needs to be carried out at high temperature, and has low denitration efficiency and high ammonia escape rate. Meanwhile, the problem of high added value utilization of nitrogen resources in the flue gas is not solved by the two methods.
Therefore, a technology for treating low-concentration nitrogen oxide is needed, and an adsorption method is adopted for treating the low-concentration nitrogen oxide according to the characteristics of the flue gas. Fixed bed adsorption denitration is mainly adopted at present, as the patent: the CN109513350A pellet flue gas low-temperature desulfurization and denitrification method utilizes a nitrogen oxide adsorption material to make a fixed bed, forms a multi-bed adsorption one-bed desorption regeneration process, and adsorbs and concentrates low-concentration nitrogen oxide into high-temperature high-concentration nitrogen oxide. Such as the patent: CN111167278A flue gas denitration device and method including plasma generation equipment utilize plasma to change nitric oxide into nitrogen dioxide that absorbs more easily, and reuse nitrogen oxide adsorption material with it fixed absorption.
The adsorption method is widely applied to treatment of low-concentration nitrogen oxides, but the adsorption method has the defects that the adsorption material needs to meet the nitrogen oxide adsorption capacity of 1-10 days, so that the use amount of the adsorption material is large, the adsorption equipment is large in occupied space, the investment cost is high, and the like.
Disclosure of Invention
In order to solve the problems, the invention adopts the following technical scheme:
a method for preparing acid by concentrating nitrogen oxides by adopting a zeolite rotating wheel and washing and absorbing the nitrogen oxides by water comprises the following steps:
the flue gas passes through an adsorption area, nitrogen oxides in the flue gas are adsorbed on the adsorption material of the denitration rotating wheel, and the flue gas emission reaching the standard is treated;
when the part of the denitration runner, which is positioned in the adsorption zone, is transferred to a microwave regeneration zone, the nitrogen oxide is resolved through desorption regeneration, air introduced from the cooling zone enters the microwave regeneration zone, and the resolved nitrogen oxide is taken out of the microwave regeneration zone;
nitrogen oxides, and O, carried over from the microwave regeneration zone3And H2Mixing and reacting O to generate nitric acid, and conveying the generated nitric oxide to an adsorption area for adsorption;
when the part of the denitration rotating wheel, which is positioned in the microwave regeneration area, is transferred to the cooling area, the air introduced from the cooling area cools the adsorbing material of the denitration rotating wheel to room temperature, and the residual nitric oxide and high-temperature gas are sent to the microwave regeneration area;
when the part of the denitration runner, which is positioned in the cooling area, is transferred to the adsorption area, the cooled adsorption material of the denitration runner adsorbs the nitrogen oxides in the flue gas, and the process is circulated.
In some embodiments, the nitrogen oxides removed from the microwave regeneration zone are fed to a water wash column into which O is introduced3Said nitrogen oxide and O3And H2And mixing and reacting O to generate nitric acid.
In some embodiments, the adsorbent material of the denitration wheel is corrugated.
In some embodiments, the adsorbent material of the denitration runner has a microwave absorbent, a nitrogen oxide adsorbent, a binder, and a glass fiber carrier.
In some embodiments, the denitration runner further comprises a runner shell, the denitration runner rotates in the runner shell, the runner shell is of a hollow structure, the runner shell is provided with an adsorption region, a microwave regeneration region and a cooling region, the two side walls of the adsorption region can be ventilated, the microwave regeneration region is provided with a regeneration region air inlet portion and a regeneration region air outlet portion, the cooling portion is provided with a cooling air inlet portion and a cooling air outlet portion, and the cooling air outlet portion is communicated with the regeneration region air inlet portion.
In some embodiments, the adsorption zone, the microwave regeneration zone, and the cooling zone are distributed in a fan shape around a circle center, and are in a plurality of fan-shaped area blocks.
In some embodiments, the microwave regeneration zone and the cooling zone comprise 15% of the circumferential area of the rotor shell.
In some embodiments, the microwave regeneration zone has mica sheets and teflon sheets on one side close to the rotor housing and a microwave generator on the other side.
In some embodiments, the microwave regeneration zone is provided with a waveguide.
The invention has the beneficial effects that:
the method for preparing acid by concentrating nitrogen oxide by adopting the zeolite rotating wheel and washing and absorbing the nitrogen oxide by water overcomes the problems of large consumption of adsorbing materials and large occupied space of fixed bed equipment in a fixed bed nitrogen oxide adsorption method; the problem of high added value utilization of nitrogen resources is solved.
Drawings
FIG. 1 is a schematic view of a process for concentrating nitrogen oxides and washing with water to absorb acid by using a zeolite wheel according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a zeolite wheel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a microwave regeneration zone according to an embodiment of the present invention.
Detailed Description
The invention is further illustrated below:
as shown in figure 1 of the drawings, in which,
the application provides an adopt zeolite runner concentration nitrogen oxide and washing to absorb device of making acid includes: denitration runner 20, runner casing 10 and washing tower 30, wherein, the adsorbing material of denitration runner 20 is corrugated, and the adsorbing material of denitration runner 20 has microwave absorbent, nitrogen oxide adsorbent, binder, fine carrier of glass, denitration runner 20 is in runner casing 10 internal rotation, runner casing 10 is hollow structure, runner casing 10 has adsorption zone 100, microwave regeneration district 200 and cooling zone 300, adsorption zone 100 both sides lateral wall all can ventilate, microwave regeneration district 200 is equipped with regeneration zone inlet portion and regeneration zone outlet portion, cooling zone 300 has cooling inlet portion and cooling outlet portion, cooling outlet portion and regeneration zone inlet portion intercommunication.
As shown in fig. 2, the adsorption area 100, the microwave regeneration area 200 and the cooling area 300 are distributed in a sector shape around a circle center, and are in a plurality of sector area blocks, and the microwave regeneration area 200 and the cooling area 300 occupy 15% of the circumferential area of the rotor shell 10.
As shown in fig. 3, one side of the microwave regeneration zone 200 close to the rotor housing has a mica sheet 221 and a teflon sheet 222, the other side has a microwave generator 210, and the microwave regeneration zone 200 is provided with a waveguide.
The nitrogen oxides brought out from the microwave regeneration zone 200 are conveyed to the water scrubber 30 from the regeneration zone gas outlet part through a desorption pipeline, and O is introduced into the water scrubber 30 through an ozone generator3Said nitrogen oxide and O3And H2The mixed reaction of O generates nitric acid, and the generated nitric oxide after the reaction is transported to the adsorption area 100 for adsorption.
The waveguide is used for guiding microwaves to the wave-absorbing material, is a metal stainless steel or aluminum frame, and is based on the principle of utilizing the rebound effect of metal on the microwaves. The mica sheet is used for blocking dust and transmitting microwaves; the Teflon sheet is used for blocking gas and transmitting microwaves.
The application provides a method for adopting zeolite runner concentration nitrogen oxide and washing absorption system acid is based on above-mentioned device, includes:
the flue gas passes through the adsorption area 100, nitrogen oxides in the flue gas are adsorbed on the adsorption material of the denitration runner 20, and the flue gas emission reaching the standard is treated;
when the part of the denitration runner 20 located in the adsorption zone 100 is transferred to the microwave regeneration zone 200, the nitrogen oxides are resolved through desorption regeneration, air introduced from the cooling zone 300 enters the microwave regeneration zone 200, and the resolved nitrogen oxides are taken out from the microwave regeneration zone 200;
nitrogen oxides, and O, carried over from microwave regeneration zone 2003And H2Mixing and reacting O to generate nitric acid, and conveying the generated nitric oxide to the adsorption area 100 for adsorption;
when the part of the denitration runner 20 located in the microwave regeneration zone 200 is transferred to the cooling zone 300, the air introduced from the cooling zone 300 cools the adsorbing material of the denitration runner 20 to room temperature, and sends the residual nitrogen oxide and high-temperature gas to the microwave regeneration zone 200;
when the part of the denitration runner 20 located in the cooling area 300 is transferred to the adsorption area 100, the cooled adsorption material of the denitration runner 20 adsorbs the nitrogen oxides in the flue gas, and the process is repeated.
The method for preparing acid by concentrating nitrogen oxide by adopting the zeolite rotating wheel and washing and absorbing the nitrogen oxide by water overcomes the problems of large consumption of adsorbing materials and large occupied space of fixed bed equipment in a fixed bed nitrogen oxide adsorption method; the problem of high added value utilization of nitrogen resources is solved.
It will be apparent to those skilled in the art that various modifications may be made to the above embodiments without departing from the general spirit and concept of the invention. All falling within the scope of protection of the present invention. The protection scheme of the invention is subject to the appended claims.
Claims (9)
1. A method for concentrating nitrogen oxides by adopting a zeolite rotating wheel and washing and absorbing to prepare acid by adopting water is characterized by comprising the following steps of:
the flue gas passes through an adsorption area (100), nitrogen oxides in the flue gas are adsorbed on the adsorption material of the denitration rotating wheel (20), and the flue gas emission reaching the standard is treated;
when the part of the denitration runner (20) positioned in the adsorption zone (100) is transferred to the microwave regeneration zone (200), the nitrogen oxide is resolved through desorption and regeneration, air introduced from the cooling zone (300) enters the microwave regeneration zone (200), and the resolved nitrogen oxide is taken out from the microwave regeneration zone (200);
nitrogen oxides and O carried over from the microwave regeneration zone (200)3And H2O is mixed and reacted to generate nitric acid, and the generated nitric oxide after the reaction is conveyed to an adsorption area (100) for adsorption;
when the part of the denitration runner (20) positioned in the microwave regeneration zone (200) is transferred to the cooling zone (300), the air introduced from the cooling zone (300) cools the adsorbing material of the denitration runner (20) to room temperature, and sends the residual nitrogen oxide and high-temperature gas to the microwave regeneration zone (200);
when the part of the denitration runner (20) positioned in the cooling area (300) is transferred to the adsorption area (100), the cooled adsorption material of the denitration runner (20) adsorbs the nitrogen oxides in the flue gas, and the process is circulated.
2. The method for concentrating nitrogen oxides and washing and absorbing acid by using the zeolite wheel as claimed in claim 1, characterized in that the nitrogen oxides discharged from the microwave regeneration zone (200) are conveyed to the water washing tower (30), and O is introduced into the water washing tower (30)3Said nitrogen oxide and O3And H2And mixing and reacting O to generate nitric acid.
3. The method for concentrating nitrogen oxides and washing with water to absorb acid by using the zeolite rotating wheel as claimed in claim 1, wherein the adsorbing material of the denitration rotating wheel (20) is corrugated.
4. The method for concentrating nitrogen oxides and washing and absorbing acid production by using the zeolite rotating wheel as claimed in claim 1, wherein the adsorption material of the denitration rotating wheel (20) comprises a microwave absorbent, a nitrogen oxide adsorbent, a binder and a glass fiber carrier.
5. The method for concentrating nitrogen oxides and washing and absorbing acid production by using the zeolite rotating wheel according to claim 1, further comprising a rotating wheel housing (10), wherein the denitration rotating wheel (20) rotates in the rotating wheel housing (10), the rotating wheel housing (10) has a hollow structure, the rotating wheel housing (10) has an adsorption region (100), a microwave regeneration region (200) and a cooling region (300), both side walls of the adsorption region (100) are permeable, the microwave regeneration region (200) has a regeneration region inlet part and a regeneration region outlet part, the cooling region (300) has a cooling inlet part and a cooling outlet part, and the cooling outlet part is communicated with the regeneration region inlet part.
6. The method for concentrating nitrogen oxides and washing and absorbing acid manufacturing by using a zeolite rotating wheel as claimed in claim 1, wherein the adsorption zone (100), the microwave regeneration zone (200) and the cooling zone (300) are distributed in a fan shape around a circle center and form a plurality of fan-shaped area blocks.
7. The method for concentrating nitrogen oxides and washing with water to absorb acid by using a zeolite wheel as claimed in claim 6, wherein the microwave regeneration zone (200) and the cooling zone (300) occupy 15% of the circumferential area of the wheel shell (10).
8. A method for concentrating nitrogen oxides by using a zeolite runner and absorbing acid by water washing according to claim 6, characterized in that the microwave regeneration zone (200) is provided with mica sheets (221) and Teflon sheets (222) at one side close to the runner shell (10) and a microwave generator (210) at the other side.
9. The method for concentrating nitrogen oxides and washing with water to absorb acid by using a zeolite wheel as claimed in claim 8, wherein said microwave regeneration zone (400) is provided with a waveguide.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110863672.5A CN113509820A (en) | 2021-07-29 | 2021-07-29 | Method for preparing acid by concentrating nitrogen oxide by zeolite rotating wheel and washing and absorbing nitrogen oxide |
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| CN202110863672.5A CN113509820A (en) | 2021-07-29 | 2021-07-29 | Method for preparing acid by concentrating nitrogen oxide by zeolite rotating wheel and washing and absorbing nitrogen oxide |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004275805A (en) * | 2003-03-12 | 2004-10-07 | Mitsubishi Heavy Ind Ltd | Method and apparatus for treating nitrogen oxide |
| CN204824173U (en) * | 2015-05-26 | 2015-12-02 | 徐州工程学院 | Nitrogen oxide system nitric acid system in flue gas |
| CN105188883A (en) * | 2013-05-09 | 2015-12-23 | 恩必安有限公司 | Air purification device |
| CN105327590A (en) * | 2015-11-18 | 2016-02-17 | 胡毅强 | Rotary-wheel-type microwave adsorption and desorption equipment |
| CN106540509A (en) * | 2016-11-25 | 2017-03-29 | 胡毅强 | Capstan head type micro-wave adsorption/desorption device |
-
2021
- 2021-07-29 CN CN202110863672.5A patent/CN113509820A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004275805A (en) * | 2003-03-12 | 2004-10-07 | Mitsubishi Heavy Ind Ltd | Method and apparatus for treating nitrogen oxide |
| CN105188883A (en) * | 2013-05-09 | 2015-12-23 | 恩必安有限公司 | Air purification device |
| CN204824173U (en) * | 2015-05-26 | 2015-12-02 | 徐州工程学院 | Nitrogen oxide system nitric acid system in flue gas |
| CN105327590A (en) * | 2015-11-18 | 2016-02-17 | 胡毅强 | Rotary-wheel-type microwave adsorption and desorption equipment |
| CN106540509A (en) * | 2016-11-25 | 2017-03-29 | 胡毅强 | Capstan head type micro-wave adsorption/desorption device |
Non-Patent Citations (2)
| Title |
|---|
| 应四新: "《微波加热与微波干燥》", 30 October 1976, 国防工业出版社, pages: 10 * |
| 张裕中等: "《高等学校专业教材 江苏省高等学校重点立项建设精品教材 食品加工技术装备 第2版》", 中国轻工业出版社, pages: 455 * |
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