CN211098942U - Flue gas direct-guiding denitration urea pyrolysis device - Google Patents
Flue gas direct-guiding denitration urea pyrolysis device Download PDFInfo
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- CN211098942U CN211098942U CN201921263836.5U CN201921263836U CN211098942U CN 211098942 U CN211098942 U CN 211098942U CN 201921263836 U CN201921263836 U CN 201921263836U CN 211098942 U CN211098942 U CN 211098942U
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Abstract
The utility model discloses a flue gas directly draws denitration urea pyrolysis device belongs to thermal power environmental protection equipment technical field. The method comprises the following steps: the boiler is characterized in that a smoke taking port is formed in the wall of the boiler and is communicated with one end of a smoke inlet pipeline; the cyclone separator is arranged on the flue gas inlet pipeline; the dust remover is arranged on the flue gas inlet pipeline and is arranged on one side of the cyclone separator, which is far away from the flue gas taking port; the cold air pipeline is communicated with the flue gas inlet pipeline through a cold air electric butterfly valve and is positioned between the flue gas taking port and the cyclone separator; the urea pyrolysis oven, the entry of urea pyrolysis oven and the other end intercommunication of flue gas inlet pipeline, the export intercommunication of urea pyrolysis oven has a plurality of pyrolysis oven exit tube ways, and each pyrolysis oven exit tube way all is provided with the fan. The utility model provides a pair of denitration urea pyrolysis device is directly drawn to flue gas, energy saving and consumption reduction can guarantee the steady operation of system.
Description
Technical Field
The utility model relates to a thermal power environmental protection equipment technical field specifically relates to a flue gas directly draws denitration urea pyrolysis device.
Background
At present, flue gas generated by a coal-fired unit of a thermal power plant contains a large amount of nitrogen oxides (NOx), in order to reduce the concentration of the nitrogen oxides (NOx) to the national safe emission standard, the mainstream technology of the domestic thermal power plant adopts urea pyrolysis to prepare ammonia gas as a reducing agent, and a Selective Catalytic Reduction (SCR) flue gas denitration process. The heat source adopts hot primary air (300 ℃) at the outlet of an air preheater, the hot primary air is heated to (580 ℃) by an electric heater and then enters a urea pyrolysis furnace, the urea solution sprayed by a spray gun is pyrolyzed, and ammonia gas (as a reducing agent) generated by pyrolysis is conveyed to an SCR reactor for reaction. In an original hot air system, an electric heater is used as core equipment of the system, the power is high, the power consumption is high, the failure rate is high, a heating pipe is easy to abrade and leak, excessive temperature trip is caused, the denitration system is caused to quit operation, the emission exceeds the standard, and the equipment reliability is low.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the flue gas direct-introduction denitration urea pyrolysis device aims to provide a technology for directly introducing high-temperature flue gas of a boiler into a urea pyrolysis furnace as a heat source so as to replace an electric heater to prepare the heat source, so that energy conservation and consumption reduction are achieved, stable operation of a system is guaranteed, and the device is convenient and practical to manufacture and install.
The specific technical scheme is as follows:
in a flue gas direct-introduction denitration urea pyrolysis device, comprises
The boiler is characterized in that a smoke taking port is formed in the wall of the boiler and is communicated with one end of a smoke inlet pipeline;
the cyclone separator is arranged on the flue gas inlet pipeline;
the dust remover is arranged on the flue gas inlet pipeline and is arranged on one side of the cyclone separator, which is far away from the flue gas taking port;
the cold air pipeline is communicated with the flue gas inlet pipeline through a cold air electric butterfly valve and is positioned between the flue gas taking port and the cyclone separator;
the inlet of the urea pyrolysis furnace is communicated with the other end of the smoke inlet pipeline, the outlet of the urea pyrolysis furnace is communicated with a plurality of pyrolysis furnace outlet pipelines, and each pyrolysis furnace outlet pipeline is provided with a fan;
and an electric heater in the original hot air system is communicated with an inlet of the urea pyrolysis furnace through a primary hot air pipeline.
In the urea pyrolysis device for direct denitration by flue gas introduction, the device is further characterized by further comprising a low-temperature superheater, the low-temperature superheater is arranged in a horizontal flue area in the boiler, and the flue gas taking port is arranged on the wall of the rear end of the low-temperature superheater.
In the urea pyrolysis device for direct flue gas denitration, the temperature of the high-temperature flue gas output from the flue gas taking port is not lower than 580 ℃.
Among the foretell flue gas direct-leading denitration urea pyrolysis device, still have such characteristic, still include electric gate valve one and electric gate valve two, cyclone is close to the one side of getting the mouth of cigarette and is provided with electric gate valve one, and one side that the dust remover deviates from cyclone in addition is provided with electric gate valve two.
In the above-mentioned flue gas direct-introduction denitration urea pyrolysis device, still have such characteristic, still include electric gate valve three, still be provided with electric gate valve three on the hot primary air pipeline.
In the direct denitration urea pyrolysis device of foretell flue gas, still have such characteristic, pyrolysis oven outlet pipe is provided with two, and one is normally open pyrolysis oven outlet pipe, and another is reserve pyrolysis oven outlet pipe.
The urea pyrolysis device for direct-fired denitration of flue gas also has the characteristics that a first fan is arranged on an outlet pipeline of the normally open pyrolysis furnace, and a fourth electric gate valve and a fifth electric gate valve are arranged on outlet pipelines of the normally open pyrolysis furnace on two sides of the first fan; and a second fan is arranged on the standby pyrolysis furnace outlet pipeline, and a sixth electric gate valve and a seventh electric gate valve are arranged on the standby pyrolysis furnace outlet pipelines on two sides of the second fan.
In the urea pyrolysis device for direct denitration by flue gas, the ceramic spraying treatment is carried out on the surfaces of the impellers in the first fan and the second fan.
Among the foretell flue gas direct-leading denitration urea pyrolysis device, still have such characteristic, the one end that normally opens pyrolysis oven outlet duct and reserve pyrolysis oven outlet duct and deviate from the urea pyrolysis oven communicates with the SCR reactor.
A method for urea pyrolysis through flue gas direct-introduction denitration comprises the following steps:
the method comprises the following steps: high-temperature flue gas generated in a boiler enters a urea pyrolysis furnace after being subjected to two-stage dust removal processes of separation and adsorption; or hot primary air (300 ℃) at the outlet of the air preheater is heated to 580 ℃ by an electric heater and then enters the urea pyrolysis furnace;
step two: decomposing the urea solution in a urea pyrolysis furnace to generate ammonia gas;
step three: ammonia gas (as a reducing agent) produced by pyrolysis is delivered to the SCR reactor for reaction.
The positive effects of the technical scheme are as follows:
the utility model provides a flue gas direct-leading denitration urea pyrolysis device, directly lead boiler high temperature flue gas into the urea pyrolysis stove as main heat source, regard former hot-blast system as reserve heat source, two systems alternative heat supply, can realize energy saving and consumption reduction when adopting boiler high temperature flue gas to supply heat, guarantee the whole stable operation of system, make the installation simple; in addition, the replacement of a new heat source system and an old heat source system can be carried out, the original hot air system is used for standby, two pipelines are arranged at the outlet of the pyrolysis furnace, one pipeline is commonly used, the other pipeline is used for standby, and the overall reliability of the system is ensured.
Drawings
Fig. 1 is the system schematic diagram of the first embodiment of the flue gas direct-introduction denitration urea pyrolysis device of the utility model.
In the drawings: 1. a boiler; 2. a low temperature superheater; 3. a cold air electric butterfly valve; 4. a cold air duct; 5. a flue gas inlet duct; 61. a first electric gate valve; 62. a second electric gate valve; 63. a third electric gate valve; 64. a fourth electric gate valve; 65. a fifth electric gate valve; 66. a sixth electric gate valve; 67. an electric gate valve seventh; 7. a cyclone separator; 8. a dust remover; 9. a primary hot air system; 91. an electric heater; 10. a hot primary air duct; 11. a urea pyrolysis furnace; 12. an outlet pipeline of the normally open pyrolysis furnace; 13. an outlet pipeline of the pyrolysis furnace is reserved; 141. a first fan; 142. and a second fan.
Detailed Description
In order to make the utility model discloses the technological means, creation characteristic, achievement purpose and efficiency that realize are easily understood and are known, and following embodiment combines the attached drawing 1 right the utility model provides a flue gas directly draws denitration urea pyrolysis device and does specifically explain.
Fig. 1 is the utility model discloses a flue gas is directly drawn denitration urea pyrolysis device's embodiment a's structural schematic diagram, in this embodiment, this flue gas is directly drawn denitration urea pyrolysis device mainly includes boiler 1, low temperature over heater 2, cold wind electric butterfly valve 3, cold wind pipeline 4, flue gas inlet pipeline 5, electric gate valve 61, electric gate valve two 62, electric gate valve three 63, electric gate valve four 64, electric gate valve five 65, electric gate valve six 66, electric gate valve seven 67, cyclone 7, dust remover 8, former hot-blast system 9, electric heater 91, hot primary air pipeline 10, urea pyrolysis furnace 11, normally open pyrolysis furnace outlet pipe 12, reserve pyrolysis furnace outlet pipe 13, fan 141, fan two 142.
In the urea pyrolysis device for direct flue gas introduction denitration, a flue gas taking port is formed in the wall of a boiler 1, the position of the flue gas taking port is selected according to specific requirements, the temperature of high-temperature flue gas at the position is required to be not lower than 580 ℃, the flue gas taking port is communicated with one end of a flue gas inlet pipeline 5, and the high-temperature flue gas enters the flue gas inlet pipeline 5. The cyclone separator 7 is arranged on the flue gas inlet pipeline 5, and the cyclone separator 7 is used for separating dust in high-temperature flue gas. The dust remover 8 is arranged on the flue gas inlet pipeline 5, the dust remover 8 is arranged on one side of the cyclone separator 7 deviating from the flue gas taking port, and the dust remover 8 is used for adsorbing dust in high-temperature flue gas, so that the dust removal efficiency can be improved, and the dust concentration entering a subsequent working section is reduced. Cold wind pipeline 4 communicates with flue gas inlet pipeline 5 through cold wind electric butterfly valve 3, and cold wind pipeline 4 is located and gets between cigarette mouth and cyclone 7, if the temperature of high temperature flue gas is too high, probably through opening cold wind electric butterfly valve 3, lets in flue gas inlet pipeline 5 with the cold wind in the cold wind pipeline 4 in, cools down the high temperature flue gas. The entry of urea pyrolysis oven 11 communicates with the other end of flue gas inlet pipe 5, and high temperature flue gas passes through flue gas inlet pipe 5 and gets into one of the heat sources of pyrolysis in the urea pyrolysis oven 11, and the export intercommunication of urea pyrolysis oven 11 has a plurality of pyrolysis oven outlet pipes, and each pyrolysis oven outlet pipe all is provided with the fan, and the ammonia that produces in the urea pyrolysis oven 11 is carried to the SCR reactor through one of them pyrolysis oven outlet pipe. The electric heater 91 in the raw hot air system 9 is communicated with the inlet of the urea pyrolysis furnace 11 through a primary hot air pipeline, and the raw hot air system 9 is also used as one of pyrolysis heat sources in the urea pyrolysis furnace 11.
In a preferred embodiment, as shown in fig. 1, the low-temperature superheater 2 is further included, the low-temperature superheater 2 is arranged in a horizontal flue area in the boiler 1, the smoke outlet is preferably arranged on a furnace wall at the rear end of the low-temperature superheater 2, the fluctuation range of the smoke temperature at the rear end of the low-temperature superheater 2 is stable, and the high-temperature smoke temperature in the area is higher than 580 ℃.
In a preferred embodiment, as shown in fig. 1, the temperature of the high-temperature flue gas output from the flue gas taking port is not lower than 580 ℃, and the temperature of the flue gas is adjusted by cold air in the cold air duct 4.
In a preferred embodiment, as shown in fig. 1, the system further comprises a first electric gate valve 61 and a second electric gate valve 62, the first electric gate valve 61 is arranged on one side of the cyclone separator 7 close to the smoke extraction port, the second electric gate valve 62 is arranged on one side of the dust remover 8 away from the cyclone separator 7, and the opening and closing of the first electric gate valve 61 and the second electric gate valve 62 controls the high-temperature smoke in the boiler 1 to enter the urea pyrolysis furnace 11.
In a preferred embodiment, as shown in fig. 1, the system further comprises a third electric gate valve 63, the third electric gate valve 63 is further disposed on the primary hot air pipeline, and the opening and closing of the third electric gate valve 63 controls the hot air in the primary hot air system 9 to enter the urea pyrolysis furnace 11.
In a preferred embodiment, as shown in fig. 1, the pyrolysis furnace outlet conduit is provided with two, one is a normally open pyrolysis furnace outlet conduit 12 and the other is a standby pyrolysis furnace outlet conduit 13, wherein when one of the pyrolysis furnace outlet conduits is open, the other is closed.
In a preferred embodiment, as shown in fig. 1, a first fan 141 is arranged on the normally open pyrolysis furnace outlet pipeline 12, and a fourth electric gate valve 64 and a fifth electric gate valve 65 are arranged on the normally open pyrolysis furnace outlet pipeline 12 on two sides of the first fan 141; be provided with fan two 142 on the reserve pyrolysis oven outlet pipe way 13, be provided with six 66 and seven 67 of electric gate valve on the reserve pyrolysis oven outlet pipe way 13 of fan two 142 both sides, place fan 141, fan 142 on the lower urea pyrolysis oven 11 outlet pipe way of temperature and do not choose to put on the flue gas inlet pipeline 5 that the temperature is high, can avoid fan 141, fan 142 to move for a long time under the high dust wearing and tearing's of high temperature bad condition like this.
In a preferred embodiment, as shown in fig. 1, the impeller surfaces in the first fan 141 and the second fan 142 are treated by spraying ceramic. Although high-temperature flue gas is subjected to bipolar dust removal by the cyclone separator 7 and the dust remover 8, a small part of dust still exists, and the special ceramic spraying treatment can improve the wear resistance of the surface of the impeller and prolong the service life.
In a preferred embodiment, as shown in fig. 1, the ends of the normally open outlet pipe 12 and the standby outlet pipe 13 facing away from the urea pyrolysis furnace 11 are communicated with an SCR reactor, and ammonia gas generated in the urea pyrolysis furnace 11 is passed into the SCR reactor to be used for reducing nitrogen oxides.
In the following description, a specific embodiment is described, and it should be noted that the structures, processes and materials described in the following embodiment are only used to illustrate the feasibility of the embodiment, and are not intended to limit the scope of the present invention.
This flue gas direct-induction denitration urea pyrolysis device's theory of operation, two sets of independent heat source systems have in the device, boiler high temperature flue gas heat source is as the heat source commonly used, and former hot-blast system is as reserve heat source, high temperature flue gas in the boiler passes through cyclone and dust remover successively, adsorb the smoke and dust in the high temperature flue gas, if the high temperature flue gas high temperature can adjust the temperature through the cold air duct, the high temperature flue gas gets into the urea pyrolysis stove as the heat source, there is the urea solution that the spray gun sprayed into in the urea pyrolysis stove, thereby the high temperature flue gas carries out thermal decomposition to the urea solution and produces the ammonia, the ammonia of production gets into the SCR reactor through one of them pyrolysis stove outlet pipe, thereby contain a large amount of nitrogen oxide in the flue gas to thermal power plant coal-fired unit production.
The above is only a preferred embodiment of the present invention, and not intended to limit the scope of the invention, and it should be appreciated by those skilled in the art that various equivalent substitutions and obvious changes made in the specification and drawings should be included within the scope of the present invention.
Claims (9)
1. The utility model provides a flue gas is directly drawn denitration urea pyrolysis device which characterized in that includes:
the boiler is characterized in that a smoke taking port is formed in the wall of the boiler and is communicated with one end of a smoke inlet pipeline;
the cyclone separator is arranged on the flue gas inlet pipeline;
the dust remover is arranged on the flue gas inlet pipeline and is arranged on one side of the cyclone separator, which is far away from the flue gas taking port;
the cold air pipeline is communicated with the flue gas inlet pipeline through a cold air electric butterfly valve and is positioned between the smoke taking port and the cyclone separator;
the inlet of the urea pyrolysis furnace is communicated with the other end of the smoke inlet pipeline, the outlet of the urea pyrolysis furnace is communicated with a plurality of pyrolysis furnace outlet pipelines, and each pyrolysis furnace outlet pipeline is provided with a fan;
and the electric heater in the primary hot air system is communicated with the inlet of the urea pyrolysis furnace through a primary hot air pipeline.
2. The urea pyrolysis device for direct flue gas denitration of claim 1, further comprising a low-temperature superheater, wherein the low-temperature superheater is arranged in a horizontal flue area in the boiler, and the flue gas taking port is arranged in a wall at the rear end of the low-temperature superheater.
3. The urea pyrolysis device for direct flue gas denitration of claim 1, wherein the temperature of the high-temperature flue gas output from the flue gas taking port is not lower than 580 ℃.
4. The device of claim 1, further comprising a first electric gate valve and a second electric gate valve, wherein the first electric gate valve is disposed on a side of the cyclone separator close to the smoke extraction port, and the second electric gate valve is disposed on a side of the dust collector away from the cyclone separator.
5. The urea pyrolysis device for direct flue gas denitration of claim 1, further comprising a third electric gate valve, wherein the third electric gate valve is further arranged on the primary hot air pipeline.
6. The urea pyrolysis device for direct flue gas denitration of claim 1, wherein the outlet pipeline of the pyrolysis furnace is provided with two pipelines, one pipeline is a normally open outlet pipeline of the pyrolysis furnace, and the other pipeline is a standby outlet pipeline of the pyrolysis furnace.
7. The urea pyrolysis device for direct flue gas denitration of claim 6, wherein a first fan is arranged on the outlet pipeline of the normally open pyrolysis furnace, and a fourth electric gate valve and a fifth electric gate valve are arranged on the outlet pipelines of the normally open pyrolysis furnace on two sides of the first fan; and a second fan is arranged on the standby pyrolysis furnace outlet pipeline, and a sixth electric gate valve and a seventh electric gate valve are arranged on the standby pyrolysis furnace outlet pipeline on two sides of the second fan.
8. The urea pyrolysis device for direct flue gas denitration of claim 7, wherein the surfaces of the impellers in the first fan and the second fan are sprayed with ceramic.
9. The urea pyrolysis device for direct denitration of flue gas according to claim 7, wherein one end of the normally open pyrolysis furnace outlet pipeline and one end of the standby pyrolysis furnace outlet pipeline, which are away from the urea pyrolysis furnace, are communicated with an SCR (selective catalytic reduction) reactor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921263836.5U CN211098942U (en) | 2019-08-06 | 2019-08-06 | Flue gas direct-guiding denitration urea pyrolysis device |
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| CN201921263836.5U CN211098942U (en) | 2019-08-06 | 2019-08-06 | Flue gas direct-guiding denitration urea pyrolysis device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110354772A (en) * | 2019-08-06 | 2019-10-22 | 昆山三一环保科技有限公司 | A kind of flue gas directly draws denitration urea pyrolysis device and method |
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- 2019-08-06 CN CN201921263836.5U patent/CN211098942U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110354772A (en) * | 2019-08-06 | 2019-10-22 | 昆山三一环保科技有限公司 | A kind of flue gas directly draws denitration urea pyrolysis device and method |
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