CN212396382U - SCR catalyst online replacement reactor - Google Patents
SCR catalyst online replacement reactor Download PDFInfo
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- CN212396382U CN212396382U CN202020973966.4U CN202020973966U CN212396382U CN 212396382 U CN212396382 U CN 212396382U CN 202020973966 U CN202020973966 U CN 202020973966U CN 212396382 U CN212396382 U CN 212396382U
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Abstract
The utility model provides a reactor is changed on line to SCR catalyst, include: an ammonia injection grid for injecting ammonia gas; the static mixer is used for fully mixing the coke oven smoke and the ammonia gas sprayed by the ammonia spraying grid and is communicated with the ammonia spraying grid; the SCR reactor is used for enabling nitrogen oxides in the mixed gas discharged by the static mixer to chemically react with ammonia to generate nitrogen and water, and comprises a plurality of SCR reactor subunits which are communicated with the static mixer in parallel; the flue gas baffle door is used for cutting off the communication between the SCR reactor subunit and the outside of the SCR reactor subunit, and comprises an inlet flue gas baffle door arranged at the inlet of the SCR reactor subunit and an outlet flue gas baffle door arranged at the outlet of the SCR reactor subunit; and the sealing fan is used for supplying air to the smoke baffle door to ensure sealing and is matched with the smoke baffle door. The utility model discloses beneficial effect: the SCR catalyst or the multiphase coupling macromolecular organic matter removing device can be replaced on line, and the coke oven can be not stopped and is rarely stopped.
Description
Technical Field
The utility model relates to an environmental protection field especially indicates a reactor is changed on line to SCR catalyst.
Background
With the implementation of the emission standard of pollutants for the coking chemical industry GB16172-2012, a new requirement is provided for the emission of NOx in the flue gas of the coke oven, and the technology for desulfurization and denitrification of the flue gas of the coke oven is still in the research and development stage in the field of domestic and foreign coking. However, the SCR denitration technology has been widely applied to thermal power generation, sintering in iron and steel enterprises, and denitration of flue gas of glass, cement, etc., wherein about 80% of all power plants in the world adopt the technology, and more than 90% of power plants in China also adopt the SCR denitration technology. The SCR denitration catalyst for the coke oven flue gas is a catalyst specially suitable for the coke oven flue gas characteristics, but the service life of the SCR denitration catalyst is generally 2-3 years, and the problem that the catalyst is replaced after being used for a certain time exists.
The coke oven smoke is generated by burning mixed gas or coke oven gas as raw material gas, the raw material gas is relatively pure, and tar is not contained after burning. However, when coal in the coke oven is subjected to dry distillation in the carbonization chamber, a large amount of tar is generated in the raw gas, the carbonization chamber and the combustion chamber are in an isolated state, and only indirect heat exchange is performed, generally, the tar cannot leak into the coke oven smoke, but when the coke oven is aged and the blowby amount of the raw gas is large, the tar in the raw gas can be mixed into the coke oven smoke, after the temperature of the coke oven smoke is reduced to below 260 ℃, tar and ammonium salts existing in a gaseous form in the coke oven smoke begin to be separated out, free carbon, dust particles and the like wrapping the coke oven smoke are condensed into solid and semi-solid colloidal substances, and the substances can gradually scale on a filter layer in front of a denitration catalyst, increase the smoke resistance, and simultaneously block, cover or even damage the denitration catalyst. These substances can be treated by adsorption with an adsorbent, but there is also a problem that the adsorbent is replaced after saturation.
The coke oven is a thermal device with a complex structure and long-term continuous production, the coke oven needs a long time of opening preparation work and high-strength masonry work after being taken out after the coke oven is stopped, the one-time investment is very high, and the environmental pollution caused by the leakage of the oven body and the smoke emission of a chimney after the coke oven is put into production is inevitable. Therefore, in order to meet the requirements that the coke oven is not stopped and is slightly stopped, and the smoke of the coke oven is continuously denitrated, an SCR catalyst on-line replacement reactor is needed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a reactor is changed on line to SCR catalyst has solved foretell problem among the prior art.
The technical scheme of the utility model is realized like this:
an SCR catalyst on-line replacement reactor comprising:
an ammonia injection grid for injecting ammonia gas;
the static mixer is used for fully mixing the coke oven smoke and the ammonia gas sprayed by the ammonia spraying grid and is communicated with the ammonia spraying grid;
the SCR reactor is used for enabling nitrogen oxides in the mixed gas discharged by the static mixer to chemically react with ammonia to generate nitrogen and water, and comprises a plurality of SCR reactor subunits which are communicated with the static mixer in parallel;
the flue gas baffle door is used for cutting off the communication between the SCR reactor subunit and the outside of the SCR reactor subunit, and comprises an inlet flue gas baffle door arranged at the inlet of the SCR reactor subunit and an outlet flue gas baffle door arranged at the outlet of the SCR reactor subunit;
and the sealing fan is used for supplying air to the smoke baffle door to ensure sealing and is matched with the smoke baffle door.
Further, the SCR reactor sub-unit comprises:
a catalyst layer disposed within the SCR reactor sub-unit;
a spare catalyst layer space disposed between the catalyst layer and the inlet flue gas damper.
Further, the SCR reactor subunit further comprises:
the multiphase coupling macromolecular organic matter removing device is used for arranging an adsorbent to adsorb macromolecular organic matters in the mixed gas discharged by the static mixer and is arranged at an inlet of a subunit of the SCR reactor.
Preferably, the adsorbent is activated coke or activated carbon.
Further, SCR catalyst changes reactor on line, still include:
and the pressure difference transmitter is used for measuring the pressure difference between the front and the back of the multiphase coupling macromolecular organic matter removing device and is connected with the multiphase coupling macromolecular organic matter removing device.
Further, the SCR reactor sub-units include a first SCR reactor sub-unit, a second SCR reactor sub-unit, and a third SCR reactor sub-unit.
The utility model has the advantages that:
SCR catalyst change reactor on line, can cut off through the flue gas damper SCR reactor subunit and its outside intercommunication to it is sealed in order to guarantee to the flue gas damper air feed through sealed fan, can change the SCR catalyst on line, simultaneously because contain tar in the coke oven flue gas, material such as ammonium salt, in order to protect the catalyst and prevent the catalyst layer scale deposit, heterogeneous coupling macromolecule organic matter removing device has been set up, with the macromolecular composition desorption such as tar in the coke oven flue gas, also can realize changing heterogeneous coupling macromolecule organic matter removing device on line, can realize the coke oven and do not shut down, shut down less.
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 described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of the reactor for online replacement of the SCR catalyst of the present invention.
In the figure:
1. an ammonia injection grid; 2. a static mixer; 3. an SCR reactor; 4. an inlet flue gas damper door; 5. sealing the fan; 6. a first SCR reactor subunit; 7. a second SCR reactor subunit; 8. a third SCR reactor subunit; 9. a differential pressure transmitter; 10. a multiphase coupling macromolecular organic matter removing device; 11. a spare catalyst layer space; 12. a catalyst layer; 13. an outlet flue gas damper.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, the reactor for online replacement of SCR catalyst of the present invention comprises:
an ammonia injection grid 1 for injecting ammonia gas;
the static mixer 2 is used for fully mixing the coke oven smoke and the ammonia gas sprayed by the ammonia spraying grid 1 and is communicated with the ammonia spraying grid 1;
the SCR reactor 3 is used for enabling nitrogen oxides in the mixed gas discharged by the static mixer 2 to chemically react with ammonia to generate nitrogen and water, and comprises a plurality of SCR reactor subunits which are communicated with the static mixer 2 in parallel;
the flue gas baffle door is used for cutting off the communication between the SCR reactor subunit and the outside of the SCR reactor subunit, and comprises an inlet flue gas baffle door 4 arranged at the inlet of the SCR reactor subunit and an outlet flue gas baffle door 13 arranged at the outlet of the SCR reactor subunit;
and a sealing fan 5 for supplying air to the flue gas baffle door to ensure sealing, and is matched with the flue gas baffle door.
Wherein the SCR reactor subunit may comprise:
a catalyst layer 12 disposed within the SCR reactor sub-unit;
a spare catalyst layer space 11 is provided between the catalyst layer 12 and the inlet flue gas damper 4.
Wherein the SCR reactor subunit may further comprise:
the multiphase coupling macromolecular organic matter removing device 10 for arranging an adsorbent to adsorb macromolecular organic matters in the mixed gas discharged by the static mixer 2 is arranged at an inlet of a subunit of the SCR reactor.
Specifically, the multiphase coupling macromolecular organic matter removal device 10 is in a fixed bed structure, an adsorbent is filled in the device, and the type, the number, the shape and the size of the adsorbent filled in the multiphase coupling macromolecular organic matter removal device 10 are determined according to the parameters of the coke oven flue gas.
Wherein, preferably, the adsorbent is activated coke or activated carbon.
Wherein, SCR catalyst changes reactor on line, can also include:
and a differential pressure transmitter 9 for measuring the pressure difference between the front and the back of the multiphase coupling macromolecular organic matter removing device 10 is connected with the multiphase coupling macromolecular organic matter removing device 10.
Specifically, the differential pressure transmitter 9 is used for measuring the pressure difference between the front and the back of the multiphase coupling macromolecular organic matter removing device 10, and when the adsorbent in the multiphase coupling macromolecular organic matter removing device 10 is saturated, the differential pressure is increased, so that the multiphase coupling macromolecular organic matter removing device 10 is replaced.
Wherein the SCR reactor sub-units may comprise a first SCR reactor sub-unit 6, a second SCR reactor sub-unit 7 and a third SCR reactor sub-unit 8.
Wherein, the SCR reactor subunit may include a manhole for replacing the multiphase coupling macromolecular organic removal device 10 or the catalyst layer 12 in the SCR reactor subunit.
SCR catalyst change reactor on line, can not blowing out at the coke oven, have the continuous denitration and the catalyst of the coke oven flue gas to be changed in step of realizing under the condition that the flue gas lasts the production in the coke oven, simultaneously because contain material such as tar, ammonium salt in the coke oven flue gas, in order to protect the catalyst and prevent the scale deposit of catalyst filter layer, the coke oven flue gas passes through heterogeneous coupling macromolecule organic matter removing device 10 of one set of fixed bed form, with the desorption of macromolecule components such as tar in the coke oven flue gas.
SCR catalyst change reactor on line, the working process is:
after being led out from an underground flue, the coke oven flue gas sequentially passes through an ammonia injection grid 1 and a static mixer 2 and then is uniformly mixed with ammonia gas to form coke oven flue gas mixed gas, the coke oven flue gas mixed gas respectively enters an SCR reactor subunit through branches at an inlet flue of an SCR reactor 3, and the flue gas subjected to denitration of each SCR reactor subunit is collected to an outlet flue of the SCR reactor through each branch and then flows to next-step flue gas treatment equipment.
Taking the SCR reactor 3 comprising three SCR reactor subunits, i.e. a first SCR reactor subunit 6, a second SCR reactor subunit 7 and a third SCR reactor subunit 8 as an example, inlets of the first SCR reactor subunit 6, the second SCR reactor subunit 7 and the third SCR reactor subunit 8 are respectively connected with an inlet flue of the SCR reactor 3, inlets of the first SCR reactor subunit 6, the second SCR reactor subunit 7 and the third SCR reactor subunit 8 are provided with inlet flue gas damper doors 4, outlets of the first SCR reactor subunit 6, the second SCR reactor subunit 7 and the third SCR reactor subunit 8 are connected with an outlet flue of the SCR reactor 3, and outlets of the first SCR reactor subunit 6, the second SCR reactor subunit 7 and the third SCR reactor subunit 8 are provided with outlet flue gas damper doors 13.
The inlet flue gas damper 4 and the outlet flue gas damper 13 seal inlets and outlets of the first SCR reactor subunit 6, the second SCR reactor subunit 7 and the third SCR reactor subunit 8 through air provided by the sealing fan 10, so that coke oven flue gas is prevented from leaking into the SCR reactor subunits needing to replace the multiphase coupling macromolecular organic matter removal device 10 or the catalyst layer 12 when the flue gas damper is closed.
Each SCR reactor subunit is provided with a layer of multiphase coupling macromolecular organic matter removing device 10, a layer of spare catalyst layer space 11 and three catalyst layers 12 from top to bottom along the flowing direction of coke oven flue gas.
When the reactor works normally, the flue gas baffle door is completely opened, and the coke oven flue gas mixed gas passes through all SCR reactor subunits.
When the SCR reactor subunit needs to be replaced, taking the operation process of the multiphase coupling macromolecular organic matter removal device 10 or the catalyst layer 12 in the first SCR reactor subunit 6 as an example, the inlet flue gas damper 4 and the outlet flue gas damper 13 of the first SCR reactor subunit 6 are closed, the sealing fan 5 is started to supply gas into the inlet flue gas damper 4 and the outlet flue gas damper 13, so as to ensure the sealing of the flue gas branch, i.e. ensure the sealing of the inlet and the outlet of the first SCR reactor subunit 6, then the access hole on the first SCR reactor subunit 6 is opened, and the multiphase coupling macromolecular organic matter removal device 10 or the catalyst layer 12 which needs to be replaced is replaced after being cooled to room temperature. After the replacement is finished, the access hole is closed, the inlet flue gas baffle door 4 and the outlet flue gas baffle door 13 are opened, the sealing fan 5 is closed, the coke oven flue gas passes through the first SCR reactor subunit 6 again, and the replacement of the first SCR reactor subunit 6 is finished. And the multiphase coupling macromolecular organic matter removing devices 10 or the catalyst layers 12 in the second SCR reactor subunit 7 and the third SCR reactor subunit 8 are replaced in sequence according to the sequence, so that the SCR reactor 3 can complete the replacement of all the multiphase coupling macromolecular organic matter removing devices 10 or the catalyst layers 12.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An SCR catalyst on-line replacement reactor, comprising:
an ammonia injection grid (1) for injecting ammonia gas;
the static mixer (2) is used for fully mixing the coke oven smoke and the ammonia gas sprayed by the ammonia spraying grid (1) and is communicated with the ammonia spraying grid (1);
the SCR reactor (3) is used for enabling nitrogen oxides in the mixed gas discharged by the static mixer (2) to chemically react with ammonia to generate nitrogen and water, and comprises a plurality of SCR reactor subunits which are communicated with the static mixer (2) in parallel;
the flue gas baffle door is used for cutting off the communication between the SCR reactor subunit and the outside of the SCR reactor subunit, and comprises an inlet flue gas baffle door (4) arranged at the inlet of the SCR reactor subunit and an outlet flue gas baffle door (13) arranged at the outlet of the SCR reactor subunit;
a sealing fan (5) for supplying air to the flue gas damper to ensure sealing, matching the flue gas damper.
2. The SCR catalyst in-line replacement reactor of claim 1, wherein the SCR reactor subunit comprises:
a catalyst layer (12) disposed within the SCR reactor sub-unit;
a spare catalyst layer space (11) disposed between the catalyst layer (12) and the inlet flue gas damper door (4).
3. The SCR catalyst in-line replacement reactor of claim 1, wherein the SCR reactor subunit further comprises:
the multiphase coupling macromolecular organic matter removing device (10) is used for arranging an adsorbent to adsorb macromolecular organic matters in the mixed gas discharged by the static mixer (2) and is arranged at an inlet of a subunit of the SCR reactor.
4. The SCR catalyst on-line replacement reactor of claim 3, wherein the adsorbent is activated coke or activated carbon.
5. The SCR catalyst on-line replacement reactor of claim 3, further comprising:
and the pressure difference transmitter (9) is used for measuring the pressure difference between the front and the back of the multiphase coupling macromolecular organic matter removing device (10) and is connected with the multiphase coupling macromolecular organic matter removing device (10).
6. An SCR catalyst on-line replacement reactor according to claim 1, characterized in that the SCR reactor sub-unit comprises a first SCR reactor sub-unit (6), a second SCR reactor sub-unit (7) and a third SCR reactor sub-unit (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020973966.4U CN212396382U (en) | 2020-06-01 | 2020-06-01 | SCR catalyst online replacement reactor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020973966.4U CN212396382U (en) | 2020-06-01 | 2020-06-01 | SCR catalyst online replacement reactor |
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| CN212396382U true CN212396382U (en) | 2021-01-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114797466A (en) * | 2022-03-25 | 2022-07-29 | 贵州西电电力股份有限公司黔北发电厂 | Thermal power plant flue gas denitration system and method for processing denitration catalyst without shutdown |
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2020
- 2020-06-01 CN CN202020973966.4U patent/CN212396382U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114797466A (en) * | 2022-03-25 | 2022-07-29 | 贵州西电电力股份有限公司黔北发电厂 | Thermal power plant flue gas denitration system and method for processing denitration catalyst without shutdown |
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