CN114353109A - Catalyst anti-blocking ash technology based on SCR denitration reactor arranged in coal-fired boiler - Google Patents
Catalyst anti-blocking ash technology based on SCR denitration reactor arranged in coal-fired boiler Download PDFInfo
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- CN114353109A CN114353109A CN202210056211.1A CN202210056211A CN114353109A CN 114353109 A CN114353109 A CN 114353109A CN 202210056211 A CN202210056211 A CN 202210056211A CN 114353109 A CN114353109 A CN 114353109A
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Abstract
The invention provides a catalyst anti-blocking ash technology based on arrangement of an SCR denitration reactor in a coal-fired boiler, which comprises a hearth, wherein the lower part of the hearth is provided with a boiler air supply outlet, a material returning device is connected above the boiler air supply outlet and at the lower part of the hearth, a separator is arranged above the material returning device, one side of the separator is connected with the upper part of the hearth, the other side of the separator is connected with a smoke exhaust pipeline, a high-temperature superheater, a low-temperature superheater, a high-temperature economizer, an SCR catalyst module, a low-temperature economizer, a primary air-air early warning and a secondary air-air early warning are sequentially arranged in the smoke exhaust pipeline, the tail end of the smoke exhaust pipeline is provided with a boiler smoke exhaust outlet, large particles on each heating surface of the tail part of the coal-fired boiler in operation can be intercepted, the arrangement of an SCR denitration catalyst in the hearth is avoided, and a large amount of conglobate falling accumulated ash during soot blowing of each heating surface of the tail part of the coal-fired boiler is scattered at the same time, avoid the blockage caused by the dropping of the bulk deposited ash on the surface of the catalyst.
Description
Technical Field
The invention relates to the technical field of smoke dust denitration, in particular to a catalyst anti-blocking ash technology based on an SCR denitration reactor arranged in a coal-fired boiler.
Background
The flue gas desulfurization and denitration technology is a boiler flue gas purification technology applied to the chemical industry of generating multi-nitrogen oxides and sulfur oxides. Nitrogen oxides and sulfur oxides are one of the main sources of air pollution. Therefore, the technology has a lot of benefits on environmental air purification, and a strict desulfurization and denitrification process is also needed when the smoke dust of the coal-fired boiler is discharged, but when the coal-fired boiler is in operation, the catalyst of the SCR denitrification reactor in the boiler is easy to cause ash deposition and blockage, and the main reasons for the blockage are as follows: firstly, the large granule blocks up catalyst protection mesh, causes the fly ash deposit when the jam volume is big to pile up, and the large granule produces the reason: a. high-temperature flue gas carrying fly ash is accumulated on a furnace wall and a heating surface and then is hardened and fallen off (the block shape and the hardness are lower) when the boiler operates; b. the high-temperature fly ash falls off after being sintered on a furnace wall and a heated surface (the high-temperature fly ash is flaky and has high hardness); c. the broken blocks of the refractory material of the furnace wall and the heat insulation cotton are washed away by the flue gas. Secondly, when soot is blown on the heating surface (a high-temperature superheater, a low-temperature superheater, a high-temperature economizer and the like) at the tail part of the coal-fired boiler, a large amount of deposited soot falls off in a lumpy manner and falls to the surface of the catalyst to be accumulated to cause blockage;
large particle soot deposition hazard: a. the flue gas drift and the local smoke velocity are increased rapidly, the local scouring abrasion of the catalyst is intensified, and the mechanical and chemical service life of the catalyst is reduced; b. the effective contact area of the catalyst is greatly reduced, the denitration efficiency is greatly reduced, the dosage of the denitration agent (ammonia water, gas ammonia and urea) is obviously increased, and the ammonia escape is increased; c. when the boiler is serious, the catalyst is blocked, so that the boiler cannot operate; d. in severe cases, environmental protection indexes (Nox) exceed standards, and therefore, a technology for preventing ash blockage of a catalyst based on arrangement of an SCR denitration reactor in a coal-fired boiler is provided to solve the problems.
Disclosure of Invention
In view of the above, the invention provides a catalyst ash blocking prevention technology based on arrangement of an SCR denitration reactor in a coal-fired boiler, which can intercept large particles on each heating surface at the tail of the coal-fired boiler during operation, avoid arrangement of the SCR denitration catalyst in the blocked boiler, simultaneously scatter a large amount of soot falling in a lump form during soot blowing on each heating surface (a high-temperature superheater, a low-temperature superheater, a high-temperature economizer and the like) at the tail of the coal-fired boiler, and avoid blockage caused by accumulation of the lump soot falling to the surface of the catalyst.
In order to solve the technical problems, the invention provides a catalyst anti-blocking ash technology based on arrangement of an SCR denitration reactor in a coal-fired boiler, which comprises a hearth, wherein a boiler air supply outlet is formed in the lower part of the hearth, a material returning device is connected above the boiler air supply outlet and on the lower part of the hearth, a separator is arranged above the material returning device, one side of the separator is connected to the upper part of the hearth, the other side of the separator is connected with a smoke exhaust pipeline, a high-temperature superheater, a low-temperature superheater, a high-temperature economizer, an SCR catalyst module, a low-temperature economizer, a primary air-air early warning and a secondary air-air early warning are sequentially arranged in the smoke exhaust pipeline, and a boiler smoke exhaust outlet is formed in the tail end of the smoke exhaust pipeline.
Furthermore, the bottom of the hearth is connected with an air supply outlet of the boiler, and one side of the upper part of the hearth is connected with a smoke inlet cavity.
Furthermore, a separator is arranged on the upper part of the smoke inlet cavity, a material returning device is arranged below the separator and in the smoke inlet cavity, and one end of the material returning device is communicated with the hearth through a communicating pipe.
Furthermore, one side of the separator is connected with the smoke exhaust pipeline through a smoke exhaust channel, one side of the smoke exhaust channel is communicated with the upper end of the smoke inlet cavity, and the other side of the smoke exhaust channel is communicated with the smoke exhaust pipeline.
Further, high temperature over heater, low temperature over heater, high temperature economizer, SCR catalyst module, low temperature economizer, the empty early warning of primary air and the empty early warning of overgrate air set gradually from top to bottom in the exhaust pipe, just all be connected with on high temperature over heater, low temperature over heater, high temperature economizer, the SCR catalyst module and prevent stifled grey screen cloth module.
Furthermore, prevent stifled grey screen cloth module by external frame and fix the screen cloth structure in external frame and constitute.
Further, the outer frame is made of 2520 material, the outer frame is rectangular, and a plurality of connecting holes are circumferentially formed in the outer base surface of the outer frame.
Furthermore, the connecting holes are bolt connecting holes, fixing frames corresponding to the ash blocking prevention screen mesh modules are arranged on the high-temperature superheater, the low-temperature superheater, the high-temperature economizer and the SCR catalyst module corresponding to the bolt connecting holes, and connecting pieces corresponding to the connecting holes are arranged on the fixing frames.
The technical scheme of the invention has the following beneficial effects:
1. by installing the protective net modules which can be quickly disassembled and assembled on the surface of each heating surface at the tail of the coal-fired boiler, the dust deposition and blocking of the SCR denitration catalyst in the boiler are avoided, the airflow distribution of the catalyst is balanced, the bias flow of flue gas, the rise of local smoke velocity and the local scouring and abrasion of the catalyst are prevented from being aggravated, and the mechanical and chemical service life of the catalyst is prolonged.
2. By installing the protective net modules which can be quickly disassembled and assembled on the surface of each heating surface at the tail part of the coal-fired boiler, the problem that the SCR denitration catalyst is deposited and blocked ash in the boiler is avoided, the problem that the effective contact area of the catalyst is reduced is avoided, and the problems that the denitration efficiency is reduced, the denitration agent (ammonia water, gas ammonia and urea) is wasted and the ammonia escape is increased are avoided.
3. By installing the protective net modules which can be quickly disassembled and assembled on the surface of each heating surface at the tail of the coal-fired boiler, the dust accumulation and blockage of the SCR denitration catalyst arranged in the boiler are avoided, and the normal operation of the boiler is ensured.
4. By installing the protective net modules which can be quickly disassembled and assembled on the surface of each heating surface at the tail of the coal-fired boiler, the dust deposition and blocking of the SCR denitration catalyst in the boiler are avoided, and the overproof environmental protection index (Nox) is avoided.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of an ash blocking screen module of the present invention;
FIG. 3 is a side view of the outer frame of the present invention;
fig. 4 is a front view of the external frame according to the present invention.
In the figure: 1. a hearth; 2. a boiler air supply outlet; 3. a material returning device; 4. a separator; 5. a smoke exhaust duct; 6. a high temperature superheater; 7. a low temperature superheater; 8. a high-temperature economizer; 9. an SCR catalyst module; 10. a low-temperature economizer; 11. primary air-to-air early warning; 12. secondary air-air early warning; 13. a boiler smoke outlet; 14. the ash blockage preventing screen module; 15. an outer frame; 16. and connecting the holes.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 4 of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
As shown in fig. 1-4: a catalyst anti-blocking ash technology based on an SCR denitration reactor arranged in a coal-fired boiler comprises a hearth 1, a boiler air supply outlet 2 is arranged at the lower part of the hearth 1, a material returning device 3 is connected above the boiler air supply outlet 2 and at the lower part of the hearth 1, a separator 4 is arranged above the material returning device 3, one side of the separator 4 is connected to the upper part of the hearth 1, the other side of the separator 4 is connected with a smoke exhaust pipeline 5, a high-temperature superheater 6, a low-temperature superheater 7, a high-temperature economizer 8, an SCR catalyst module 9, a low-temperature economizer 10, a primary air early warning 11 and a secondary air early warning 12 are sequentially arranged in the smoke exhaust pipeline 5, a boiler exhaust outlet 13 is arranged at the tail end of the smoke exhaust pipeline 5, a connecting flange is arranged at the lower part of the hearth, the boiler air supply outlet is connected to the hearth through the connecting flange to ensure the sealing performance, and the material returning device is connected to the upper part of the hearth, the boiler smoke output from the hearth passes through the separator after passing through the separator, the solid particles are separated from the smoke contained in the boiler smoke by the separator, then the solid particles fall into the material returning device and are output from the lower part of the material returning device, the smoke processed by the separator is heated by the high-temperature superheater, and then the smoke is output after passing through the low-temperature superheater, the high-temperature economizer, the SCR catalyst module, the low-temperature economizer, the primary air early warning and the secondary air early warning.
According to an embodiment of the invention, as shown in fig. 1, the bottom of the furnace 1 is connected with a boiler air supply outlet 2, one side of the upper part of the furnace 1 is connected with a smoke inlet cavity, and a connecting pipe connected with the smoke inlet cavity is arranged at the upper part of the furnace and below the separator;
a separator 4 is arranged at the upper part of the smoke inlet cavity, a material returning device 3 is arranged below the separator 4 and in the smoke inlet cavity, one end of the material returning device 3 is also communicated with the hearth 1 through a communicating pipe, a blanking port is arranged at the lower part of the material returning device, and smoke dust particles collected by the material returning device are output from the blanking port;
one side of the separator 4 is connected with a smoke exhaust pipeline 5 through a smoke exhaust channel, one side of the smoke exhaust channel is communicated with the upper end of the smoke inlet cavity, the other side of the smoke exhaust channel is communicated with the smoke exhaust pipeline 5, and two sides of the smoke exhaust channel are respectively communicated with the smoke exhaust pipeline and the smoke inlet cavity;
the low-temperature superheater 7, the high-temperature economizer 8, the SCR catalyst module 9, the low-temperature economizer 10, the primary air-air early warning 11 and the secondary air-air early warning 12 are sequentially arranged in the smoke exhaust pipeline 5 from top to bottom, and the high-temperature superheater 6, the low-temperature superheater 7, the high-temperature economizer 8 and the SCR catalyst module 9 are all connected with an ash blockage preventing screen module 14.
According to one embodiment of the present invention, as shown in fig. 2, 3 and 4, the ash blockage preventing screen module 14 is composed of an outer frame 15 and a screen structure fixed in the outer frame 15, wherein the inner side of the outer frame is fixedly connected with the screen structure;
the external frame 15 is made of 2520 material, the external frame 15 is rectangular, a plurality of connecting holes 16 are circumferentially arranged on the outer base surface of the external frame 15, and the external frame is made of 2520 square steel pipes;
the connecting holes 16 are bolt connecting holes 16, fixing frames corresponding to the anti-blocking screen mesh modules 14 are arranged on the high-temperature superheater 6, the low-temperature superheater 7, the high-temperature economizer 8 and the SCR catalyst module 9 corresponding to the bolt connecting holes 16, connecting pieces corresponding to the connecting holes 16 are arranged on the fixing frames, through holes corresponding to the connecting pieces, namely connecting bolts, are arranged on the fixing frames, and the connecting pieces penetrate through the through holes and are fixed in the connecting holes.
The use method of the invention comprises the following steps:
the boiler smoke vent is conveyed to a boiler air supply vent through an air feeder, enters a hearth through the boiler air supply vent, is discharged to a smoke exhaust pipeline through a separator in the hearth, and then is discharged after passing through a high-temperature superheater, a low-temperature superheater, a high-temperature economizer, an SCR catalyst module, a low-temperature economizer, primary air-air early warning and secondary air-air early warning in the smoke exhaust pipeline.
In the present invention, unless otherwise explicitly specified or limited, for example, it may be fixedly attached, detachably attached, or integrated; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A catalyst ash blocking prevention technology based on an SCR denitration reactor arranged in a coal-fired boiler is characterized in that: including furnace (1), the lower part of furnace (1) is provided with boiler supply-air outlet (2), boiler supply-air outlet (2) top and have returning charge ware (3) at the sub-unit connection of furnace (1), returning charge ware (3) top and being provided with separator (4), the upper portion in furnace (1) is connected to separator (4) one side, exhaust pipe (5) are connected to the opposite side of separator (4), high temperature over heater (6), low temperature over heater (7), high temperature economizer (8), SCR catalyst module (9), low temperature economizer (10), the empty early warning of primary air (11) and secondary air (12) have set gradually in exhaust pipe (5), the end of exhaust pipe (5) is provided with boiler exhaust port (13).
2. The coal-fired boiler furnace-based catalyst ash blockage prevention technology for arranging the SCR denitration reactor in the coal-fired boiler furnace according to claim 1, characterized in that: the bottom of the hearth (1) is connected with a boiler air supply outlet (2), and one side of the upper part of the hearth (1) is connected with a smoke inlet cavity.
3. The coal-fired boiler furnace-based catalyst ash blockage prevention technology for arranging the SCR denitration reactor in the coal-fired boiler furnace according to claim 2, characterized in that: the upper portion of advancing the cigarette chamber sets up separator (4), the below of separator (4) just sets up returning charge ware (3) in advancing the cigarette chamber, the one end of returning charge ware (3) still is linked together with furnace (1) through communicating pipe.
4. The coal-fired boiler furnace-based catalyst ash blockage prevention technology for arranging the SCR denitration reactor in the coal-fired boiler furnace according to claim 3, characterized in that: one side of the separator (4) is connected with the smoke exhaust pipeline (5) through a smoke exhaust channel, one side of the smoke exhaust channel is communicated with the upper end of the smoke inlet cavity, and the other side of the smoke exhaust channel is communicated with the smoke exhaust pipeline (5).
5. The coal-fired boiler furnace-based catalyst ash blockage prevention technology for arranging the SCR denitration reactor in the coal-fired boiler furnace according to claim 4, characterized in that: high temperature over heater (6), low temperature over heater (7), high temperature economizer (8), SCR catalyst module (9), low temperature economizer (10), the empty early warning of air of primary air (11) and overgrate air early warning (12) set gradually from top to bottom in exhaust pipe (5), just all be connected with on high temperature over heater (6), low temperature over heater (7), high temperature economizer (8), SCR catalyst module (9) and prevent stifled grey screen cloth module (14).
6. The coal-fired boiler furnace-based catalyst ash blockage prevention technology for arranging the SCR denitration reactor in the coal-fired boiler furnace according to claim 5, characterized in that: the ash blockage preventing screen mesh module (14) consists of an outer frame (15) and a screen mesh structure fixed in the outer frame (15).
7. The coal-fired boiler furnace-based catalyst ash blockage prevention technology for arranging the SCR denitration reactor in the coal-fired boiler furnace according to claim 6, characterized in that: the outer frame (15) is made of 2520 materials, the outer frame (15) is rectangular, and a plurality of connecting holes (16) are formed in the circumferential direction of the outer base surface of the outer frame (15).
8. The coal-fired boiler furnace-based catalyst ash blockage prevention technology for arranging the SCR denitration reactor in the coal-fired boiler furnace according to claim 7, characterized in that: connecting hole (16) are bolted connection hole (16), correspond bolted connection hole (16) are provided with the mount that suits with preventing stifled grey screen cloth module (14) on high temperature over heater (6), low temperature over heater (7), high temperature economizer (8), SCR catalyst module (9), be provided with the connecting piece that suits with connecting hole (16) on the mount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210056211.1A CN114353109A (en) | 2022-01-18 | 2022-01-18 | Catalyst anti-blocking ash technology based on SCR denitration reactor arranged in coal-fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210056211.1A CN114353109A (en) | 2022-01-18 | 2022-01-18 | Catalyst anti-blocking ash technology based on SCR denitration reactor arranged in coal-fired boiler |
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| Publication Number | Publication Date |
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| CN114353109A true CN114353109A (en) | 2022-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210056211.1A Pending CN114353109A (en) | 2022-01-18 | 2022-01-18 | Catalyst anti-blocking ash technology based on SCR denitration reactor arranged in coal-fired boiler |
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| CN (1) | CN114353109A (en) |
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2022
- 2022-01-18 CN CN202210056211.1A patent/CN114353109A/en active Pending
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