CN211345371U - System for escape ammonia catalytic oxidation alleviates air preheater and blocks up - Google Patents
System for escape ammonia catalytic oxidation alleviates air preheater and blocks up Download PDFInfo
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- CN211345371U CN211345371U CN201921843276.0U CN201921843276U CN211345371U CN 211345371 U CN211345371 U CN 211345371U CN 201921843276 U CN201921843276 U CN 201921843276U CN 211345371 U CN211345371 U CN 211345371U
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- ozone
- flue
- air preheater
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- ammonia
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Abstract
The utility model relates to a system that air preheater blockked up is alleviated in escape ammonia catalytic oxidation relates to industrial waste gas purification environmental protection and energy field, concretely relates to system that air preheater blockked up is alleviated in escape ammonia catalytic oxidation, including boiler and chimney, the boiler passes through the flue and links to each other with the chimney, still is provided with inlet channel on the boiler, flue and inlet channel pass through the air preheater and link to each other, the utility model discloses simple structure utilizes ozone injection apparatus to spout ozone in to the flue to combine the catalyst layer, make the escape ammonia in ozone and the flue gas desorption, spout the volume of ozone for being located between SCR denitration reactor and the catalyst layer in the flue escape ammonia's mole ratio more than or equal to 3, guarantee the thoroughness of escape ammonia desorption to realize high-efficient desorption escape ammonia, avoid the rising of air preheater pressure differential, effectively alleviate the air preheater and block up.
Description
Technical Field
The utility model relates to an industrial waste gas purifies environmental protection and energy field, concretely relates to escape ammonia catalytic oxidation alleviates system that air preheater blockked up.
Background
The energy resource endowment of China determines that coal-fired power generation dominates in short term and long term. At present, coal-fired power generating units are reformed by ultralow emission, wherein the removal of nitrogen oxides is mainly completed by an SCR denitration technology. The SCR denitration means that ammonia gas and nitrogen oxide in flue gas are sprayed into an SCR reactor to perform oxidation reduction reaction under the catalytic action of a catalyst so as to achieve the aim of removing the nitrogen oxide. In the method, when the nitrogen oxides are removed, unreacted ammonia gas escapes from the SCR outlet and is mixed with SO in the flue gas3The reaction takes place to produce highly viscous ammonium bisulfate. When the load of part of coal-fired units changes, due to the defects of ammonia injection valve control, SCR flow field and the like, the phenomenon of large escape of excessive ammonia injection can occur, more fly ash in ammonium bisulfate bonded flue gas is generated and attached to a heat exchange unit of an air preheater to block the air preheater, the load of the units is limited when the load is serious, and the generated energy is reduced. Meanwhile, large escape ammonia also affects subsequent dust collectors and induced draft fans, and can cause the efficiency reduction of the dust collectors and the output shortage of the induced draft fans.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides an effectively alleviate air preheater and block up, investment cost and working costs are low, and the system that air preheater blockked up is alleviated in the catalytic oxidation of an escape ammonia that can high-efficient desorption escape ammonia.
The utility model relates to a system for releasing blockage of an air preheater by catalytic oxidation of escaping ammonia, which comprises a boiler and a chimney, wherein the boiler is connected with the chimney through a flue, the boiler is also provided with an air inlet channel, the flue is connected with the air inlet channel through the air preheater, a coal economizer and an SCR denitration reactor are sequentially arranged in the flue between the air preheater and the boiler, and a limestone-gypsum wet desulphurization device is arranged on the flue between the air preheater and the chimney;
an ozone injection device is arranged in a flue between the SCR denitration reactor and the air preheater, a catalyst layer is arranged on the flue between the ozone injection device and the air preheater in a plugging manner, an outlet of the ozone injection device faces to the catalyst layer, and the ozone injection device is connected with an ozone generator through a pipeline extending out of the flue;
the ozone injection device injects ozone in such an amount that the molar ratio of escaped ammonia in flue gas between the SCR denitration reactor and the catalyst layer is more than or equal to 3.
Preferably, the catalyst layer comprises an effective catalyst layer and an ineffective catalyst layer, the effective catalyst layer and the ineffective catalyst layer are arranged in parallel on the cross section of the flue, the effective catalyst layer is arranged on one side of the flue between the ozone injection device and the air preheater and is positioned right above the ozone injection device, the catalyst arranged in the effective catalyst layer is CuMnOx/HZSM-5, and the catalyst arranged in the ineffective catalyst layer is a carrier with the same structure as the effective catalyst but without active ingredients.
Preferably, the ozone injection device comprises a plurality of groups of ozone nozzles, the same group of ozone nozzles are connected with the ozone generator through an ozone inlet pipe, and the ozone inlet pipe is provided with ozone injection control valves.
Preferably, the ozone nozzles are arranged in two groups, and the two groups of ozone nozzles are arranged right above the effective catalyst layer.
Preferably, an ammonia escape detector is arranged at the outlet of the SCR denitration device, and the ammonia escape detector is an optical technology AEMS 10.
Preferably, a dust remover is also arranged on the flue between the chimney and the limestone-gypsum wet desulphurization device.
A method for relieving blockage of an air preheater through catalytic oxidation of escaped ammonia comprises the steps that flue gas enters a flue from a boiler in a system for relieving blockage of the air preheater through catalytic oxidation of escaped ammonia, the flue gas sequentially passes through an economizer and an SCR (selective catalytic reduction) denitration reactor, SCR (selective catalytic reduction) removes nitrogen oxides in the flue gas through oxidation-reduction reaction of sprayed ammonia and the nitrogen oxides in the flue gas under the action of a catalyst, escaped ammonia in the flue gas in the flue between the SCR denitration reactor and a catalyst layer is measured through an ammonia escape detector arranged at the outlet of the SCR denitration device, and the amount of ozone sprayed by an ozone nozzle is determined through the following relation: the molar ratio of escaping ammonia in the flue gas between the SCR denitration reactor and the catalyst layer is more than or equal to 3; controlling the spraying amount of ozone through an ozone spraying control valve;
the flue gas enters a flue between the SCR denitration reactor and the air preheater, when passing through the ozone spraying device and the catalyst layer, the ozone sprayed by the ozone spraying device oxidizes ammonia escaping from the flue gas under the catalytic action of the catalyst layer, and the oxidized flue gas sequentially passes through the limestone-gypsum wet desulphurization device and the dust remover and then enters a chimney to be discharged.
The utility model discloses simple structure utilizes ozone injection apparatus to spout into ozone in to the flue to combine the catalyst layer, make the escape ammonia in ozone and the flue gas carry out the desorption, spout the volume of ozone for being located between SCR denitration reactor and the catalyst layer in the flue the mole ratio more than or equal to 3 of escape ammonia, guarantee the thoroughness of escape ammonia desorption, thereby realize high-efficient desorption escape ammonia, avoid air preheater pressure differential to rise, effectively alleviate air preheater and block up. Compared with other methods, SO is removed3In terms of the method, the ozone can be directly prepared through air, the source is reliable, no secondary pollutant is generated, and the method has the advantages of high reliability, energy conservation, consumption reduction and the like, and has wide application prospectAnd 4. preparing the compound.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of the installation of the ozone injection device and the catalyst layer of the present invention.
Reference numerals: the method comprises the following steps of 1-a boiler, 2-a coal economizer, 3-an SCR denitration reactor, 4-an ozone injection device, 5-a catalyst layer, 6-an air preheater, 7-a dust remover, 8-a limestone-gypsum wet desulphurization device, 9-a chimney, 10-an ozone generator, 11-a flue, 12-an effective catalyst layer, 13-an ineffective catalyst layer, 14-an ozone nozzle and 15-an ozone injection control valve.
Detailed Description
The utility model relates to a system for escape ammonia catalytic oxidation alleviates air preheater 6 and blocks up, including boiler 1 and chimney 9, boiler 1 passes through flue 11 and chimney 9 and links to each other, still is provided with inlet channel on boiler 1, flue 11 and inlet channel pass through air preheater 6 and link to each other, economizer 2 and SCR denitration reactor 3 have set gradually in flue 11 between air preheater 6 and boiler 1, be provided with lime stone-gypsum wet flue desulfurization device 8 on flue 11 between air preheater 6 and chimney 9;
an ozone injection device 4 is arranged in a flue 11 between the SCR denitration reactor 3 and the air preheater 6, a catalyst layer 5 is arranged on the flue 11 between the ozone injection device 4 and the air preheater 6 in a sealing way, the outlet of the ozone injection device 4 faces to the catalyst layer 5, and the ozone injection device 4 is connected with an ozone generator 10 through a pipeline extending out of the flue 11;
the amount of the ozone sprayed by the ozone spraying device 4 is that the molar ratio of escaped ammonia in flue gas in a flue 11 between the SCR denitration reactor 3 and the catalyst layer 5 is more than or equal to 3.
The catalyst layer 5 comprises an effective catalyst layer 12 and an ineffective catalyst layer 13, the effective catalyst layer 12 and the ineffective catalyst layer 13 are arranged in parallel on the cross section of the flue 11, the effective catalyst layer 12 is arranged on one side of the flue 11 between the ozone injection device 4 and the air preheater 6 and is positioned right above the ozone injection device 4, the catalyst arranged in the effective catalyst layer 12 is CuMnOx/HZSM-5, and the catalyst arranged in the ineffective catalyst layer 13 is a carrier with the same structure as the effective catalyst but without active ingredients.
The ozone injection device 4 comprises a plurality of groups of ozone nozzles 14, the same group of ozone nozzles 14 are connected with the ozone generator 10 through an ozone inlet pipe, and ozone injection control valves 15 are arranged on the ozone inlet pipe.
The ozone nozzles 14 are provided in two sets, and both sets of ozone nozzles 14 are provided directly above the effective catalyst layer 12.
An ammonia escape detector is arranged at an outlet of the SCR denitration device, and the ammonia escape detector is an optical technology AEMS 10.
A dust remover 7 is also arranged on the flue 11 between the chimney 9 and the limestone-gypsum wet desulphurization device 8. The ozone generator 10 can use air as a source, which is convenient and fast.
A method for relieving blockage of an air preheater 6 by catalytic oxidation of escaped ammonia, wherein flue gas enters a flue 11 from a boiler 1 in a system for relieving blockage of the air preheater 6 by catalytic oxidation of escaped ammonia, and then sequentially passes through an economizer 2 and an SCR (selective catalytic reduction) denitration reactor 3, the SCR removes nitrogen oxides in the flue gas by oxidation-reduction reaction of sprayed ammonia and the nitrogen oxides in the flue gas under the action of a catalyst, the escaped ammonia in the flue gas in the flue 11 between the SCR denitration reactor 3 and a catalyst layer 5 is measured by an ammonia escape detector arranged at the outlet of the SCR denitration device, and the ozone amount sprayed by an ozone nozzle 14 is determined by the following relation: the molar ratio of escaped ammonia in the flue gas in the flue 11 between the SCR denitration reactor 3 and the catalyst layer 5 is more than or equal to 3; the spraying amount of ozone is controlled by an ozone spraying control valve 15;
the flue gas enters a flue 11 between the SCR denitration reactor 3 and the air preheater 6, when passing through the ozone spraying device and the catalyst layer 5, the ozone sprayed by the ozone spraying device oxidizes escaped ammonia in the flue gas under the catalytic action of the catalyst layer 5, and the oxidized flue gas sequentially passes through the limestone-gypsum wet desulphurization device 8 and the dust remover 7 and then enters a chimney 9 to be discharged.
The utility model discloses well lime stone-gypsum wet flue gas desulfurization device 8, dust remover 7, SCR denitration reactor 3, economizer 2 are prior art.
The utility model discloses simple structure utilizes ozone injection apparatus 4 to spout into ozone in flue 11 to combine catalyst layer 5, make the escape ammonia in ozone and the flue gas carry out the desorption, spout the volume of ozone and for being located between SCR denitration reactor 3 and the catalyst layer 5 in the flue 11 in the flue gas the mole ratio more than or equal to 3 of escape ammonia, guarantee the thoroughness of escape ammonia desorption, thereby realize high-efficient desorption escape ammonia, avoid the rising of 6 pressure differentials of air preheater, effectively alleviate 6 clogs ups of air preheater. Compared with other methods, SO is removed3In terms of the method, the ozone can be directly prepared through air, the source is reliable, no secondary pollutant is generated, and the method has the advantages of high reliability, energy conservation, consumption reduction and the like and has wide application prospect.
Claims (6)
1. A system for relieving blockage of an air preheater through catalytic oxidation of escaped ammonia comprises a boiler (1) and a chimney (9), wherein the boiler (1) is connected with the chimney (9) through a flue (11), the boiler (1) is also provided with an air inlet channel, the flue (11) is connected with the air inlet channel through an air preheater (6), an economizer (2) and an SCR denitration reactor (3) are sequentially arranged in the flue (11) between the air preheater (6) and the boiler (1), and a limestone-gypsum wet desulphurization device (8) is arranged on the flue (11) between the air preheater (6) and the chimney (9);
the method is characterized in that an ozone injection device (4) is arranged in a flue (11) between the SCR denitration reactor (3) and the air preheater (6), a catalyst layer (5) is arranged on the flue (11) between the ozone injection device (4) and the air preheater (6) in a plugging manner, an outlet of the ozone injection device (4) faces the catalyst layer (5), and the ozone injection device (4) is connected with an ozone generator (10) through a pipeline extending out of the flue (11);
the amount of the ozone sprayed by the ozone spraying device (4) is that the molar ratio of escaped ammonia in flue gas in a flue (11) between the SCR denitration reactor (3) and the catalyst layer (5) is more than or equal to 3.
2. The system for relieving blockage of the air preheater by catalytic oxidation of escaped ammonia as claimed in claim 1, wherein the catalyst layer (5) comprises an effective catalyst layer (12) and an ineffective catalyst layer (13), the effective catalyst layer (12) and the ineffective catalyst layer (13) are arranged in parallel on the cross section of the flue (11), and the effective catalyst layer (12) is arranged on one side of the flue (11) between the ozone injection device (4) and the air preheater (6) and is positioned right above the ozone injection device (4).
3. The system for relieving the blockage of the air preheater by catalytic oxidation of escaped ammonia as claimed in claim 2, wherein the ozone injection device (4) comprises a plurality of groups of ozone nozzles (14), the same group of ozone nozzles (14) is connected with the ozone generator (10) through an ozone inlet pipe, and the ozone inlet pipe is provided with an ozone injection control valve (15).
4. The system for relieving blockage of the air preheater by catalytic oxidation of escaped ammonia as claimed in claim 3, wherein the ozone nozzles (14) are arranged in two groups, and the two groups of ozone nozzles (14) are arranged right above the effective catalyst layer (12).
5. The system for alleviating blockage of an air preheater by catalytic oxidation of escaping ammonia as claimed in claim 4, wherein an ammonia escape detector is arranged at the outlet of the SCR denitration device, and the ammonia escape detector is an ammonia escape detector of an optical technology AEMS 10.
6. The system for relieving the blockage of the air preheater by catalyzing and oxidizing the escaped ammonia according to claim 5, wherein a dust remover (7) is further arranged on the flue (11) between the chimney (9) and the limestone-gypsum wet desulphurization device (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921843276.0U CN211345371U (en) | 2019-10-30 | 2019-10-30 | System for escape ammonia catalytic oxidation alleviates air preheater and blocks up |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921843276.0U CN211345371U (en) | 2019-10-30 | 2019-10-30 | System for escape ammonia catalytic oxidation alleviates air preheater and blocks up |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211345371U true CN211345371U (en) | 2020-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921843276.0U Expired - Fee Related CN211345371U (en) | 2019-10-30 | 2019-10-30 | System for escape ammonia catalytic oxidation alleviates air preheater and blocks up |
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| Country | Link |
|---|---|
| CN (1) | CN211345371U (en) |
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2019
- 2019-10-30 CN CN201921843276.0U patent/CN211345371U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200825 Termination date: 20211030 |
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| CF01 | Termination of patent right due to non-payment of annual fee |