CN114471148A - Microwave heating dissociation denitration method for flue gas of thermal power plant - Google Patents
Microwave heating dissociation denitration method for flue gas of thermal power plant Download PDFInfo
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- CN114471148A CN114471148A CN202210192343.7A CN202210192343A CN114471148A CN 114471148 A CN114471148 A CN 114471148A CN 202210192343 A CN202210192343 A CN 202210192343A CN 114471148 A CN114471148 A CN 114471148A
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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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—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
- B01D53/005—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 heat treatment
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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
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
- B01J19/12—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electromagnetic waves
- B01J19/122—Incoherent waves
- B01J19/126—Microwaves
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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 microwave heating dissociation denitration method for flue gas of a thermal power plant, wherein boiler flue gas generated by denitration of the thermal power plant is firstly subjected to denitration by a selective catalytic reduction denitration system, and denitrated gas enters a microwave reaction cavity to be subjected to microwave nitrogen oxide removal; wherein the temperature in the microwave reaction cavity is 550-650 ℃, the microwave frequency of the microwave reaction cavity is 2550 +/-15 MHz, and the microwave output mode of the microwave reaction cavity adopts continuous waves; by selecting the microwave with the frequency of 2550 +/-15 MHz and matching with the temperature in the microwave reaction chamber 3 at 550-650 ℃, higher energy can be provided to complete denitration, the efficiency is higher, no additional auxiliary measures are needed, and the denitration cost is greatly reduced.
Description
Technical Field
The invention relates to the technical field of flue gas purification, in particular to a microwave heating dissociation denitration method for flue gas of a thermal power plant.
Background
At present, most of coal-fired thermal power plants mainly adopt a combined process of SNCR-SCR coupled denitration, cloth bag dust removal, flue gas desulfurization and dust removal. But along with the continuous shrink of environmental protection policy, the flue gas emission index is lower and lower, and present denitration technology has hardly satisfied standard requirement, simultaneously because the restriction in place is to the transformation of present technology unusual difficulty.
In order to solve the problem of site limitation, many thermal power plants adopt an ozone oxidation denitration technology, and although the technology can solve the site problem, the application of the technology is restricted due to high operation cost and difficult treatment of product nitrate and nitrite. Microwave as a new energy source has been developed in the environmental field for many years, and the oxidation of NO by microwave discharge is the subject of extensive research in the current dry flue gas treatment technology, but the oxidized nitrogen oxide needs to be absorbed to generate nitrate and nitrite, which brings secondary pollution. So that it proposes microwave heating to dissociate NO, and the dissociated product is N2No new pollution is brought.
In view of the above, chinese patent (CN101693162A) discloses a method for simultaneously desulfurizing and denitrating boiler flue gas by using activated carbon under microwave radiation, which is used to solve the problem of removing sulfur dioxide and nitrogen oxides. The technical scheme is as follows: introducing the dedusted flue gas into an activated carbon bed, and performing desulfurization and denitrification on activated carbon under the conditions of microwave heating at 400-600 ℃, wherein CuCl is added into the activated carbon as a catalyst, and the addition amount of CuCl is 10-30 kg per cubic meter of the activated carbon; utilizes the selective heating performance of microwave and combines carbon to SO2And the NOx reduction capability, and the efficiency of desulfurization and denitration are improved simultaneously. Chinese patent (CN109647156A) discloses a microwave high-temperature selective non-catalytic denitration device, which comprises an air inlet system, a microwave reactor and a flue gas analyzer; the air intake system comprises N2Gas source, O2Gas source, NO gas source and NH3A gas source; the microwave reactor comprises an outer casing box body, a quartz tube, zinc oxide honeycomb ceramics and a magnetron, wherein the quartz tube is arranged in the outer casing box body, one end of the quartz tube is communicated with the air inlet system, and the other end of the quartz tube is communicated with the flue gas analyzer; zinc oxide honeycomb potteryFilling porcelain in the quartz tube to form a microwave high-temperature reaction bed; the magnetron is arranged outside the outer shell box body and used for carrying out radiant heating on the zinc oxide honeycomb ceramics; a resonant cavity is formed in the outer shell box body, the characteristic that zinc oxide can be rapidly heated under the action of microwaves is applied to the high-temperature denitration field, the reaction temperature of gas entering the denitration device is controlled by adjusting the output power of the magnetron, and nitric oxide and ammonia gas in flue gas are subjected to redox reaction under the high-temperature condition, so that the aims of denitration and emission reduction are fulfilled.
It is clear from the above prior art that although both use microwave radiation heating schemes, they both require additional devices, namely an activated carbon bed and a zinc oxide honeycomb ceramic. Therefore, there is a need for improvement to provide a microwave heating dissociation denitration method for flue gas of a thermal power plant, which has the advantages of simple process, high denitration efficiency and low cost.
Disclosure of Invention
The invention aims to provide a thermal power plant flue gas microwave heating dissociation denitration method which is simple in process, high in denitration efficiency and low in cost.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a microwave heating dissociation denitration method for flue gas of a thermal power plant, wherein boiler flue gas generated by denitration of the thermal power plant is firstly subjected to denitration by a selective catalytic reduction denitration system, and denitrated gas enters a microwave reaction cavity to be subjected to microwave nitrogen oxide removal; wherein the temperature in the microwave reaction cavity is 550-650 ℃, the microwave frequency of the microwave reaction cavity is 2550 +/-15 MHz, and the microwave output mode of the microwave reaction cavity adopts continuous waves.
Preferably, the microwave reaction cavity is connected with a microwave reactor; the microwave reactor is provided with two CPUs, one of which is a main processor and the other of which is an auxiliary processor.
Preferably, the output power of the microwave reactor is not less than 1800W.
Preferably, the microwave reactor is provided with a thermal protection device.
Preferably, the thermal protection device is a protective shell arranged outside the microwave reactor, and the shell of the protective shell is provided with an interlayer for flowing the condensate.
Preferably, a non-contact shielding type infrared temperature sensor is arranged in the microwave reaction cavity.
Preferably, the cavity surface of the microwave reaction cavity is coated with a protective coating.
Preferably, the protective coating is a vinyl ester or phenoxy resin material.
Preferably, a monitor is arranged in the microwave reaction cavity.
Preferably, the microwave reaction cavity is a stainless steel cavity.
Compared with the prior art, the invention has the following technical effects:
(1) according to the invention, through selecting the microwave with the frequency of 2550 +/-15 MHz and matching with the temperature in the microwave reaction chamber of 550-650 ℃, higher energy can be provided to complete denitration, the efficiency is higher, activated carbon is not required, and the denitration cost is greatly reduced.
(2) According to the invention, by adopting a denitration technology mainly based on microwave heating to dissociate NO, the product is nitrogen, NO ammonia escapes, and NO secondary pollution is caused; meanwhile, NO is dissociated by microwave heating, so that the method has the advantages of rapidness in dissociation, high efficiency, time saving and energy saving; the actual denitrification efficiency is high and is stabilized to be more than 90%, and the requirement of ultralow emission can be met.
(3) The microwave reaction cavity of the invention is connected with a microwave reactor, the microwave reactor is provided with two CPUs, one of which is a main processor, and the other is an assistant processor; the auxiliary processor assists the main processor to control the temperature, so that the phenomenon of unstable programs caused by a single CPU is avoided; the reliability of the operation can be increased by higher operation speed and larger operation capacity.
(4) The microwave reactor is provided with a thermal protection device which is a protective shell arranged on the outer side of the microwave reactor, and the shell of the protective shell is provided with an interlayer for flowing of condensate; the simple protection device structure design not only effectively ensures the safe operation of the microwave reactor, but also reduces the construction cost of the whole device.
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 embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic view of a microwave heating dissociation denitration process for flue gas of a thermal power plant according to the present invention;
FIG. 2 is a diagram of NO conversion rate corresponding to temperature in a microwave reaction chamber according to the present invention.
Wherein, 1-a thermal power plant boiler; 2-an SCR reactor; 3-microwave reaction cavity; 4-a microwave reactor; 5-a thermal protection device; 6-non-contact shielding type infrared temperature sensor; 7-next process.
Detailed Description
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a thermal power plant flue gas microwave heating dissociation denitration method which is simple in process, high in denitration efficiency and low in cost.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1 and fig. 2, the invention provides a microwave heating dissociation denitration method for flue gas of a thermal power plant, boiler flue gas generated by denitration of a boiler 1 of the thermal power plant enters an SCR (selective catalytic reduction) reactor 2(SCR) for denitration, the denitrated gas enters a microwave reaction chamber 3 for microwave nitrogen oxide removal, and then enters a next process 7; wherein the temperature in the microwave reaction cavity 3 is 550-650 ℃, the microwave frequency of the microwave reaction cavity 3 is 2550 +/-15 MHz, and the microwave output mode of the microwave reaction cavity 3 adopts continuous waves.
The working principle is as follows: the energy of high-energy electrons in a microwave field is 3-10eV, the dissociation energy of NO is 6.4eV, microwave heating can realize the dissociation of NO to generate a large number of N free radicals and O free radicals, the N free radicals have high activity to react with NO, so that the most main product in a microwave heating NO system is N2. Wherein, the reaction in the microwave reaction cavity 3 is as follows:
by adopting a denitration technology mainly based on microwave heating and NO dissociation, the product is nitrogen, NO ammonia escapes, and NO secondary pollution is caused; meanwhile, NO is dissociated by microwave heating, so that the method has the advantages of rapidness in dissociation, high efficiency, time saving and energy saving; the actual denitrification efficiency is high and is stabilized to be more than 90%, and the requirement of ultralow emission can be met.
By selecting the microwave with the frequency of 2550 +/-15 MHz and matching with the temperature in the microwave reaction chamber 3 at 550-650 ℃, higher energy can be provided to complete denitration, the efficiency is higher, activated carbon is not required, and the denitration cost is greatly reduced.
Further, the microwave reaction cavity 3 is connected with a microwave reactor 4; the microwave reactor 4 is provided with two CPUs, one of which is a main processor and the other of which is an assist processor. The auxiliary processor assists the main processor to control the temperature, so that the phenomenon of unstable programs caused by a single CPU is avoided; the reliability of the operation can be increased by higher operation speed and larger operation capacity. Furthermore, the output power of the microwave reactor 4 is not less than 1800W.
Further, the microwave reactor 4 is provided with a thermal protection 5. Furthermore, the thermal protection device 5 is a protective shell arranged outside the microwave reactor 4, and the shell of the protective shell is provided with an interlayer for flowing the condensate; the simple structure design of the protection device 5 not only effectively ensures the safe operation of the microwave reactor 4, but also reduces the construction cost of the whole device.
Further, a non-contact shielding type infrared temperature sensor 6 is arranged in the microwave reaction cavity 3; the high-precision non-contact shielding type infrared temperature sensor 6 is adopted to detect and regulate the temperature inside the microwave reaction cavity 3 in real time, and compared with the traditional resistance temperature measurement, the temperature measurement is more sensitive, more accurate, faster, safer and simpler to operate.
Further, the surface of the cavity of the microwave reaction cavity 3 is coated with a protective coating; the surface of the cavity of the microwave reaction cavity 3 is coated with a high-toughness protective coating, so that the reaction cavity can be guaranteed against the corrosion of various harmful gases in the flue gas for a long time, and the service life of the microwave reaction cavity is prolonged; furthermore, the protective coating adopts vinyl ester or phenoxy resin material.
Further, a monitor is arranged in the microwave reaction cavity; the monitor has the function of whole-course dynamic video recording, clearly captures the reaction state and makes adjustment in time.
Further, the microwave reaction cavity adopts a stainless steel cavity; the stainless steel cavity is high temperature resistant and easy to clean.
The adaptation according to the actual needs is within the scope of the invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A microwave heating dissociation denitration method for flue gas of a thermal power plant is characterized by comprising the following steps: firstly feeding boiler flue gas generated by denitration in a thermal power plant into a selective catalytic reduction denitration system for denitration, and feeding the denitrated gas into a microwave reaction cavity for microwave nitrogen oxide removal; the temperature in the microwave reaction cavity is 550-650 ℃, the microwave frequency of the microwave reaction cavity is 2550 +/-15 MHz, and the microwave output mode of the microwave reaction cavity adopts continuous waves.
2. The microwave heating dissociation denitration method for the flue gas of the thermal power plant according to claim 1, characterized in that: the microwave reaction cavity is connected with a microwave reactor; the microwave reactor is provided with two CPUs, wherein one CPU is a main processor, and the other CPU is an auxiliary processor.
3. The microwave heating dissociation denitration method for the flue gas of the thermal power plant as claimed in claim 2, characterized in that: the output power of the microwave reactor is not less than 1800W.
4. The microwave heating dissociation denitration method for the flue gas of the thermal power plant as claimed in claim 3, characterized in that: the microwave reactor is provided with a thermal protection device.
5. The microwave heating dissociation denitration method for the flue gas of the thermal power plant as claimed in claim 4, characterized in that: the thermal protection device is a protection shell arranged on the outer side of the microwave reactor, and the shell of the protection shell is provided with an interlayer for flowing of condensate.
6. The microwave heating dissociation denitration method for the flue gas of the thermal power plant as claimed in claim 5, characterized in that: and a non-contact shielding type infrared temperature sensor is arranged in the microwave reaction cavity.
7. The microwave heating dissociation denitration method for the flue gas of the thermal power plant as claimed in claim 6, characterized in that: and the surface of the cavity of the microwave reaction cavity is coated with a protective coating.
8. The microwave heating dissociation denitration method for the flue gas of the thermal power plant according to claim 7, characterized in that: the protective coating is made of vinyl ester or phenoxy resin materials.
9. The microwave heating dissociation denitration method for the flue gas of the thermal power plant according to claim 8, characterized in that: and a monitor is arranged in the microwave reaction cavity.
10. The microwave heating dissociation denitration method for the flue gas of the thermal power plant as claimed in claim 9, characterized in that: the microwave reaction cavity adopts a stainless steel cavity.
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| CN202210192343.7A CN114471148A (en) | 2022-03-01 | 2022-03-01 | Microwave heating dissociation denitration method for flue gas of thermal power plant |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4076606A (en) * | 1975-01-29 | 1978-02-28 | Kabushiki Kaisha Pollution Preventing Research Laboratory | Method of decomposing nitrogen oxide (NOx) |
| JP2003229300A (en) * | 2002-02-05 | 2003-08-15 | Japan Science & Technology Corp | Microwave discharge generating device, and environment pollution gas treating method |
| CN1785484A (en) * | 2005-11-01 | 2006-06-14 | 深圳清华大学研究院 | Microwave assisted plasma catalytic air purification method and purification device |
| CN102407073A (en) * | 2011-12-30 | 2012-04-11 | 湘潭大学 | Denitration method for two-section microwave catalytic reaction bed |
| CN108905541A (en) * | 2018-07-10 | 2018-11-30 | 东北大学 | A kind of method of microwave plasma decomposition NO |
| CN109647156A (en) * | 2018-12-28 | 2019-04-19 | 武汉理工大学 | Microwave high-temperature selective non-catalytic denitrification apparatus |
-
2022
- 2022-03-01 CN CN202210192343.7A patent/CN114471148A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4076606A (en) * | 1975-01-29 | 1978-02-28 | Kabushiki Kaisha Pollution Preventing Research Laboratory | Method of decomposing nitrogen oxide (NOx) |
| JP2003229300A (en) * | 2002-02-05 | 2003-08-15 | Japan Science & Technology Corp | Microwave discharge generating device, and environment pollution gas treating method |
| CN1785484A (en) * | 2005-11-01 | 2006-06-14 | 深圳清华大学研究院 | Microwave assisted plasma catalytic air purification method and purification device |
| CN102407073A (en) * | 2011-12-30 | 2012-04-11 | 湘潭大学 | Denitration method for two-section microwave catalytic reaction bed |
| CN108905541A (en) * | 2018-07-10 | 2018-11-30 | 东北大学 | A kind of method of microwave plasma decomposition NO |
| CN109647156A (en) * | 2018-12-28 | 2019-04-19 | 武汉理工大学 | Microwave high-temperature selective non-catalytic denitrification apparatus |
Non-Patent Citations (1)
| Title |
|---|
| 曹春梅等: "微波直接分解脱除ＮＯ的数值模拟研究", 《华北电力大学学报》 * |
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Application publication date: 20220513 |