CN216726652U - Full-time denitration system of coal-fired thermal power generating unit - Google Patents

Full-time denitration system of coal-fired thermal power generating unit Download PDF

Info

Publication number
CN216726652U
CN216726652U CN202122844848.0U CN202122844848U CN216726652U CN 216726652 U CN216726652 U CN 216726652U CN 202122844848 U CN202122844848 U CN 202122844848U CN 216726652 U CN216726652 U CN 216726652U
Authority
CN
China
Prior art keywords
hot
flue gas
coal
flue
thermal power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202122844848.0U
Other languages
Chinese (zh)
Inventor
王伟
史建奇
张洪言
徐志儒
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shandong Zhixin Electric Power Technology Co ltd
Original Assignee
Shandong Zhixin Electric Power Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shandong Zhixin Electric Power Technology Co ltd filed Critical Shandong Zhixin Electric Power Technology Co ltd
Priority to CN202122844848.0U priority Critical patent/CN216726652U/en
Application granted granted Critical
Publication of CN216726652U publication Critical patent/CN216726652U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The utility model relates to a full-time denitration system of a coal-fired thermal power generating unit, which comprises a main flue (10), a denitration device (11) and a hot blast stove (6), wherein the hot blast stove (6) is communicated with the main flue (10) through a flue gas extraction pipeline (3), the hot blast stove (6) is provided with a heating device (4) and an elbow connector (5) for introducing primary air, and the outlet of the hot blast stove (6) is merged into a flue at the front end of the denitration device (11) through a high-temperature flue gas pipeline (7). The utility model can realize the operation of the full-time denitration system, ensures that the inlet smoke temperature of the denitration device is more than 300 ℃, realizes the SCR operation rate of 100% in each stage, can meet the requirement of deep peak regulation in the future and increases the flexibility of the unit participating in peak regulation.

Description

Full-time denitration system of coal-fired thermal power generating unit
Technical Field
The utility model relates to the technical field of environmental protection, in particular to an environmental protection technology for a coal-fired power plant, and specifically relates to a full-time denitration system for a coal-fired thermal power unit.
Background
Along with the improvement of living standard of people, higher and higher requirements are put forward to living environment, particularly in the field of environmental protection, various environmental protection instructions are increasingly issued by the nation, and the pollution source is strictly monitored. For a thermal power plant, the emission concentration of pollutants is required to be not over-standard when a boiler operates at low load, and the emission of the boiler reaches the standard when the boiler starts, stops operating and operates at each load. The denitration of the unit in the whole time (including the start-stop stage) gradually becomes the environmental protection normalization requirement. The denitration system can not be put into use in the starting stage, so that the emission of nitrogen oxides exceeds the standard, environmental protection punishment can be faced, and even the unit can not be started.
In addition, as the power consumption is slowed down, the coal-electricity unit is over-put into production, and the coal-electricity unit has the functions of high-speed increasing non-fossil energy power generation deep peak regulation, standby and the like, the utilization hours of domestic thermal power equipment are continuously reduced. It is expected that peak regulation and low-load operation of the coal-fired unit will become normal in a period of time in the future, and the peak regulation capability will be important competitiveness of future power generation enterprises. However, the magnitude of the deep peak shaver is limited by the denitration withdrawal.
The normal working temperature range of the denitration catalyst is 300-400 ℃, and the catalyst can not play a due role when the temperature is lower than or exceeds the temperature range. At present, when the load of a coal-fired thermal power generating unit is lower than 40%, the temperature of flue gas at an SCR inlet is often lower than the lowest allowable temperature of a catalyst, the requirement of normal operation of a denitration system cannot be met, the environmental protection index does not reach the standard, and the deep peak regulation capacity of the unit is influenced.
Therefore, aiming at the long-term low-load working condition in the starting stage and the subsequent deep peak regulation state, the problem which needs to be solved urgently is solved by improving the temperature of the denitration inlet flue gas, realizing the denitration purpose of low load and starting and stopping in the whole period and meeting the operation requirement of the unit whole period denitration system.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model provides a full-time denitration system of a coal-fired thermal power generating unit, which is suitable for the start and low-load stable combustion stages of the unit, and can improve the smoke temperature of an SCR inlet through an external heat source to meet the requirement of the operation condition of a catalyst, thereby realizing the input of the denitration system of the unit under any load and meeting the environmental protection requirement of NOx emission indexes.
The utility model is realized by the following technical scheme, and provides a full-time denitration system of a coal-fired thermal power generating unit, which comprises a main flue, a denitration device and a hot blast stove, wherein the hot blast stove is communicated with the main flue through a flue gas extraction pipeline, the hot blast stove is provided with a heating device and an elbow connector for introducing primary air, and an outlet of the hot blast stove is merged into a flue at the front end of the denitration device through a high-temperature flue gas pipeline.
After the scheme is adopted, when the low-load flue gas temperature is low, the natural gas gun (or oil gun) heating device is put into operation, firstly, the natural gas gun (or oil gun) heating device is violently and stably combusted under the assistance of combustion-supporting hot primary air of independent air distribution, and the flame of the gas gun (or oil gun) is completely combusted under the action of the hot primary air in the hot blast stove after being sprayed out of the combustion cylinder. At the moment, flue gas taken from the position of a hearth reheater is introduced from a mixed flue gas inlet of a hot blast stove, the flue gas is fully mixed with high-temperature flue gas generated by combustion of a natural gas gun (or an oil gun) in the hot blast stove, the temperature of the mixed flue gas is controlled to be about 650 ℃, the mixed flue gas is sprayed into a flue at the inlet of a denitration device through a high-temperature flue gas pipeline to be mixed with the original flue gas, and the mixed flue gas temperature reaches about 300 ℃ to meet the denitration input requirement.
Preferably, the first expansion joint and the adjusting door are installed on the smoke extraction pipeline. According to the preferred scheme, the first expansion joint is designed to be used for absorbing the thermal expansion amount of the pipeline, and the regulating valve is designed to regulate the extracted smoke amount.
Preferably, a pneumatic isolation door and a second expansion joint are arranged on the high-temperature flue gas pipeline. According to the preferred scheme, the second expansion joint is designed to absorb the thermal expansion amount of the pipeline, and the pneumatic isolation door is designed to control the on-off of the high-temperature flue gas pipeline.
Preferably, the heating device is a natural gas gun or an oil gun. In the preferred scheme, the natural gas gun (or oil gun) heating device with independent air distribution is axially inserted into the hot blast stove from the elbow of the hot blast stove to supply fuel for the hot blast stove.
Preferably, the primary air introduced into the elbow connector is hot primary air.
Preferably, a dividing wall type mixing barrel structure is arranged in the hot blast stove, and a flange interface is reserved on the side surface of the mixing barrel and is communicated with a smoke extraction pipeline. This preferred scheme is rational in infrastructure, and reliable operation is convenient for install and use.
In conclusion, when the coal-fired power generating set is used, the boiler is in the stages of starting, stopping and low-load operation, the full-time denitration system is put into operation, the inlet smoke temperature of the denitration device is ensured to be more than 300 ℃, the SCR operation rate of each stage is 100%, the requirement of future deep peak regulation can be met, and the flexibility of the unit participating in peak regulation is improved.
Drawings
FIG. 1 is a schematic structural diagram of a full-time denitration system of a coal-fired thermal power generating unit;
shown in the figure:
1. the device comprises a first expansion joint, 2, an adjusting valve, 3, a smoke extraction pipeline, 4, a heating device, 5, an elbow connector, 6, a hot blast stove, 7, a high-temperature smoke pipeline, 8, a pneumatic isolation door, 9, a second expansion joint, 10, a main flue, 11 and a denitration device.
Detailed Description
In order to clearly illustrate the technical features of the present invention, the present invention is further illustrated by the following detailed description with reference to the accompanying drawings.
As shown in fig. 1, a coal-fired thermal power generating unit whole-period denitration system is provided, including main flue 10 and denitrification facility 11, still include hot-blast furnace 6, hot-blast furnace 6 communicate with main flue 10 through extraction flue gas pipeline 3, hot-blast furnace 6 be equipped with heating device 4 and be used for letting in the elbow interface 5 of primary air, extraction flue gas pipeline 3, the export of hot-blast furnace 6 merge into the flue of denitrification facility 11 front end through the high temperature flue gas pipeline 7 that is equipped with.
In this embodiment, extraction flue gas pipeline 3 on install first expansion joint 1 and governing valve 2, high temperature flue gas pipeline 7 on install pneumatic isolated gate 8 and second expansion joint 9, heating device 4 be natural gas gun (or oil gun), the primary air that elbow interface 5 lets in be hot primary air, 6 inside partition wall formula mixing drum structures that are equipped with of hot-blast furnace, the side of mixing drum leave the flange interface and communicate with extraction flue gas pipeline 3.
Finally, it should be further noted that the above examples and descriptions are not limited to the above embodiments, and technical features of the present invention that are not described may be implemented by or using the prior art, and are not described herein again; the above embodiments and drawings are only for illustrating the technical solutions of the present invention and not for limiting the present invention, and the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that changes, modifications, additions or substitutions within the spirit and scope of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and shall also fall within the scope of the claims of the present invention.

Claims (6)

1. The utility model provides a coal-fired thermal power unit whole period deNOx systems, includes flue (10) and denitrification facility (11), its characterized in that still includes hot-blast furnace (6), hot-blast furnace (6) through extraction flue gas pipeline (3) and flue (10) intercommunication, hot-blast furnace (6) be equipped with heating device (4) and elbow interface (5) that are used for letting in the primary air, the export of hot-blast furnace (6) merge into the flue of denitrification facility (11) front end through high temperature flue gas pipeline (7) that are equipped with in.
2. The system according to claim 1, wherein the first expansion joint (1) and the adjusting door (2) are installed on the flue gas extraction pipeline (3).
3. The system according to claim 1, wherein the high-temperature flue gas pipeline (7) is provided with a pneumatic isolation door (8) and a second expansion joint (9).
4. The system for denitration by coal-fired thermal power generating unit according to claim 1, wherein the heating device (4) is a natural gas gun or an oil gun.
5. The system according to claim 1, wherein the primary air introduced into the elbow connector (5) is hot primary air.
6. The system according to claim 1, wherein a dividing wall type mixing barrel structure is arranged inside the hot blast stove (6), and a flange interface is reserved on the side surface of the mixing barrel and communicated with the smoke extraction pipeline (3).
CN202122844848.0U 2021-11-19 2021-11-19 Full-time denitration system of coal-fired thermal power generating unit Active CN216726652U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202122844848.0U CN216726652U (en) 2021-11-19 2021-11-19 Full-time denitration system of coal-fired thermal power generating unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202122844848.0U CN216726652U (en) 2021-11-19 2021-11-19 Full-time denitration system of coal-fired thermal power generating unit

Publications (1)

Publication Number Publication Date
CN216726652U true CN216726652U (en) 2022-06-14

Family

ID=81928621

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202122844848.0U Active CN216726652U (en) 2021-11-19 2021-11-19 Full-time denitration system of coal-fired thermal power generating unit

Country Status (1)

Country Link
CN (1) CN216726652U (en)

Similar Documents

Publication Publication Date Title
CN103697482B (en) A kind of organic exhaust gas boiler heating power burning processing system and process technique
CN204395778U (en) A kind of ultra-clean exhaust system for fluidized-bed combustion boiler
CN104437082A (en) Ultra-clean discharge system and method for fluidized bed boiler
CN102635852A (en) Fuel oil/gas boiler for reducing emission of nitric oxides and method
CN110141961A (en) A kind of coal-burning boiler full load SCR denitration system
CN204395745U (en) A kind of clean exhaust system for fluidized-bed combustion boiler
CN216726652U (en) Full-time denitration system of coal-fired thermal power generating unit
CN204611743U (en) Boiler controller system
CN210473607U (en) Full-load SCR denitration system of coal-fired boiler
CN204716317U (en) The interactive start up system of a kind of generator set
CN105987379B (en) Boiler controller system
CN110094725B (en) Ultralow nitrogen combustion method for coal-fired power generating unit
CN216080364U (en) Full-time-period denitration hot blast stove heating device
CN203240600U (en) System for controlling nitric oxide in coal water slurry fired boiler
CN102538489A (en) Afterheat utilization flue after-burning device and after-burning method thereof
CN202420214U (en) Waste-heat utilization flue after-burning device
CN101907296B (en) Effective dimethyl ether/air low NOx high-temperature burning system
CN108105794A (en) A kind of SCR denitration system inlet flue gas temperature adaptive regulation method
CN205782837U (en) Face denitration bringing normally into operation device startup stage that the feedwater of stove progressive solution realizing with flue gas
CN104511234B (en) A kind of clean exhaust system for fluidized-bed combustion boiler and method
CN214914829U (en) Denitration system and boiler equipment
CN213955364U (en) System for deposit ammonium bisulfate among air heater based on high temperature flue gas clearance
CN217154226U (en) Transformation system for improving powder feeding medium temperature of storage type powder making system by extracting high-temperature furnace smoke
CN211854070U (en) System for adjusting temperature of boiler furnace outlet
CN210128359U (en) Multipurpose low-nitrogen combustion device for coke oven

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant