CN218178905U

CN218178905U - SCR flue gas recirculation system

Info

Publication number: CN218178905U
Application number: CN202222688386.2U
Authority: CN
Inventors: 封雷; 程美玲; 王建飞; 马纯滢; 赵承军; 刘彩忠
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-10-13
Filing date: 2022-10-13
Publication date: 2022-12-30
Anticipated expiration: 2032-10-13

Abstract

The utility model relates to the technical field of SCR, in particular to an SCR flue gas recirculation system in the waste incineration power generation industry, which comprises an SCR reactor, an ammonia spraying grid and a flue gas baffle, wherein the SCR reactor is connected with a reactor gas inlet pipeline and a reactor gas outlet pipeline, the reactor gas inlet pipeline and the reactor gas outlet pipeline are both connected with a main pipeline communicated with a dust remover outlet flue gas pipeline, and the main pipeline is communicated with the ammonia spraying grid and the flue gas baffle through the flue gas recirculation pipeline; the utility model discloses the flue gas that draws forth from the trunk line replaces the flue gas that draws forth from the flue gas workshop as sealed wind and dilution wind, and the flue gas temperature that the trunk line was drawn forth is higher, does not need steam heating just can be used for flue gas baffle and ammonia injection grille, and the temperature satisfies SCR operation needs, has reduced the energy consumption, and steam heating device also can save; the smoke led out from the main pipeline does not influence the numerical value of SCR smoke particles, and the noise is reduced; the amount of pollutants discharged is also reduced.

Description

SCR flue gas recirculation system

Technical Field

The utility model relates to a SCR technical field specifically is a SCR flue gas recirculation system of msw incineration power generation trade.

Background

The existing SCR sealing air and dilution air are both taken from a flue gas workshop, and the steam of the existing SCR sealing air and dilution air is required to be heated by boiler drum steam and then is respectively used for an SCR flue gas baffle and an ammonia spraying grid behind an evaporation mixer, so that a large amount of steam is consumed, the steam heating effect is not ideal, the operation requirement of SCR cannot be met, and the operation efficiency of SCR is reduced; the smoke taken from the smoke workshop has high noise, and the clean air in the smoke workshop can change, so that the numerical value of SCR smoke particulate matters is unstable; the flue gas in the flue gas workshop can not participate in combustion, so that the exhaust oxygen content is higher, and the pollutant emission is high.

SUMMERY OF THE UTILITY MODEL

A main object of the utility model is to provide a SCR flue gas recirculation system to solve among the above-mentioned prior art SCR seal up wind and dilute the wind and all take from the flue gas workshop, the power consumption is higher, and outlet temperature can not satisfy SCR operation needs, and SCR flue gas particulate matter numerical value is unstable, and the noise is big, the problem that the pollutant emission is high.

In order to realize the above purpose, the utility model provides a SCR flue gas recirculation system, including the SCR reactor, spout ammonia grider, flue gas baffle, the SCR reactor is connected reactor admission line and reactor pipeline of giving vent to anger, and reactor admission line and reactor pipeline of giving vent to anger all are connected with the trunk line that communicates with dust remover export flue gas pipeline, and the trunk line passes through flue gas recirculation pipeline intercommunication and spouts ammonia grider and flue gas baffle.

Further, the ammonia injection grid is arranged in the gas inlet pipeline of the reactor.

Further, the flue gas baffle is arranged on the reactor gas inlet pipeline, the reactor gas outlet pipeline and the main pipeline.

Furthermore, the flue gas recirculation pipeline comprises a first recirculation branch pipeline communicated with the ammonia spraying grid and a second recirculation branch pipeline communicated with the flue gas baffle, wherein the first recirculation branch pipeline is provided with a dilution fan, and the second recirculation branch pipeline is provided with a sealing fan.

Further, a heater is arranged on the gas inlet pipeline of the reactor.

Further, an induced draft fan is arranged on the main pipeline, and an outlet of the main pipeline is communicated with a chimney.

The utility model discloses the flue gas that draws from the trunk line was drawn forth and is replaced the flue gas that draws from the flue gas workshop and be as sealed wind and dilution wind, and the flue gas temperature that the trunk line was drawn forth is higher, does not need steam heating just can be used for flue gas baffle and spout ammonia grignard, and the temperature satisfies SCR operation needs, has reduced the energy consumption, and steam heating device also can save; the smoke led out from the main pipeline does not influence the numerical value of SCR smoke particles, and the noise is reduced; the amount of pollutants discharged is also reduced.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

FIG. 1 is a schematic structural diagram of an embodiment;

in the figure: 1. an SCR reactor; 2. a reactor gas inlet conduit; 3. a reactor gas outlet pipe; 4. a main pipeline; 5. spraying ammonia grid; 6. a flue gas baffle; 7. a flue gas recirculation duct; 71. a first recirculation branch conduit; 72. a second recirculation branch conduit; 73. a dilution fan; 74. sealing the fan; 8. a heater; 9. an induced draft fan.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1, according to an embodiment of the present invention, there is provided an SCR flue gas recirculation system, comprising an SCR reactor 1, an ammonia injection grid 5, and a flue gas baffle 6, wherein the SCR reactor 1 is connected to a reactor inlet pipe 2 and a reactor outlet pipe 3, both the reactor inlet pipe 2 and the reactor outlet pipe 3 are connected to a main pipe 4, and the reactor inlet pipe 2 is provided with the ammonia injection grid 5 and a heater 8; the reactor inlet pipeline 2, the reactor outlet pipeline 3 and the main pipeline 4 are all provided with a flue gas baffle 6; an induced draft fan 9 is arranged on the main pipeline 4, the inlet of the main pipeline 4 is communicated with a flue gas pipeline at the outlet of the dust remover, and the outlet of the main pipeline 4 is communicated with a chimney; the main pipeline 4 is communicated with an ammonia spraying grid 5 and a smoke baffle 6 through a smoke recirculation pipeline 7.

The flue gas recirculation pipeline 7 comprises a first recirculation branch pipeline 71 communicated with the ammonia injection grid 5 and a second recirculation branch pipeline 72 communicated with the flue gas baffle 6, wherein a dilution fan 73 is arranged on the first recirculation branch pipeline 71, and a sealing fan 74 is arranged on the second recirculation branch pipeline 73.

In the prior art, the SCR sealing air and the dilution air are both taken from a flue gas workshop, and are respectively used for a flue gas baffle and an ammonia spraying grid after steam of a boiler drum is heated, but the actual steam heating effect is not ideal, the actual outlet temperatures of the SCR sealing air and the dilution air are 154 ℃ and 104 ℃, the temperature of the SCR sealing air and the temperature of the dilution air can reach 170 ℃, and the SCR operation requirement can be met.

The embodiment has obvious energy-saving and emission-reducing effects, and the saturated steam amount can be reduced by about 0.3T per year by calculating the SCR of the garbage incinerator at 400T/d; the flue gas led out from the main pipeline can participate in combustion, and the oxygen discharge amount is reduced by 0.6%; because the temperature of the dilution air is increased to reach the standard temperature, the efficiency of SCR is correspondingly improved, the emission of nitrogen oxides is reduced by 2.6 t/year, and the pollutant exceeding risk is reduced; the air pressure of the flue gas led out from the main pipeline is positive pressure, the air inlets of the sealing fan and the dilution fan are self-positive pressure, and all the fans are equivalent to booster fans, so that the electric energy can be reduced; the influence on SCR flue gas particulate matter when reducing flue gas workshop health clearance, fan noise can further reduce, and former SCR dilutes wind and seals wind steam heating device and can save.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a SCR flue gas recirculation system, includes SCR reactor (1), spouts ammonia grid (5), flue gas baffle (6), its characterized in that, SCR reactor (1) is connected reactor admission line (2) and reactor pipeline (3) of giving vent to anger, and reactor admission line (2) and reactor pipeline (3) of giving vent to anger all are connected with trunk line (4) with dust remover export flue gas pipeline intercommunication, trunk line (4) are through flue gas recirculation pipeline (7) intercommunication spout ammonia grid (5) and flue gas baffle (6).

2. An SCR flue gas recirculation system according to claim 1, characterized in that the ammonia injection grid (5) is arranged in the reactor inlet duct (2).

3. An SCR flue gas recirculation system according to claim 1, characterized in that the flue gas baffle (6) is arranged in the reactor inlet duct (2), the reactor outlet duct (3) and the main duct (4).

4. An SCR flue gas recirculation system according to claim 1, wherein the flue gas recirculation duct (7) comprises a first recirculation branch duct (71) communicating with the ammonia injection grid (5) and a second recirculation branch duct (72) communicating with the flue gas baffle (6), the first recirculation branch duct (71) being provided with a dilution fan (73) and the second recirculation branch duct (72) being provided with a sealing fan (74).

5. An SCR flue gas recirculation system according to claim 1, characterized in that the reactor inlet duct (2) is provided with a heater (8).

6. The SCR flue gas recirculation system of claim 1, wherein an induced draft fan (9) is arranged on the main pipeline (4), and an outlet of the main pipeline (4) is communicated with a chimney.