CN216080364U

CN216080364U - Full-time-period denitration hot blast stove heating device

Info

Publication number: CN216080364U
Application number: CN202122844839.1U
Authority: CN
Inventors: 董超; 张洪言; 徐志儒
Original assignee: Shandong Zhixin Electric Power Technology Co ltd
Current assignee: Shandong Zhixin Electric Power Technology Co ltd
Priority date: 2021-11-19
Filing date: 2021-11-19
Publication date: 2022-03-18
Anticipated expiration: 2031-11-19

Abstract

The utility model relates to a hot blast stove heating device for full-time denitration, which comprises a hot blast stove body (1), wherein a dividing wall type mixing barrel (7) is arranged in the hot blast stove body (1), a combustion device is arranged in the dividing wall type mixing barrel (7), a flue gas inlet (6) for extracting flue gas is arranged on the side face of the dividing wall type mixing barrel, a combustion-supporting air elbow connector (4) is arranged on the hot blast stove body (1), the combustion device is axially inserted into the hot blast stove body (1) from the combustion-supporting air elbow connector (4), and a flue gas mixing chamber (8) is connected to the rear part of the dividing wall type mixing barrel (7). According to the utility model, by putting the hot blast stove heating device for denitration in the whole time period into operation, the temperature of the smoke at the SCR inlet is ensured to be more than 300 ℃, the SCR operation rate of each stage is 100%, the requirement of deep peak regulation in the future can be met, the flexibility of the unit participating in peak regulation is increased, the peak regulation benefit is increased, and the beneficial effects of good safety, convenience in use and high flexibility are achieved.

Description

Full-time-period denitration hot blast stove heating device

Technical Field

The utility model relates to the technical field of environmental protection, in particular to denitration treatment equipment, and specifically relates to a heating device of a hot blast stove for full-time denitration.

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 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, in order to deal with the long-term low-load working condition under the starting stage and the subsequent deep peak regulation state, the flue gas temperature at the denitration inlet is improved, the denitration purpose of low-load and starting and stopping full time periods is realized, and the operation of a unit full time period denitration system is met, a hot blast stove heating device for full time period denitration suitable for the unit starting and low-load stable combustion stage needs to be developed urgently, an external heat source is provided for the full time period denitration system to improve the flue gas temperature at the SCR inlet so as to meet the requirement of the catalyst operating condition, the device is required to realize that the flue gas temperature at the denitration inlet of the unit under any load meets the input requirement of the denitration system, the emission index of NOx is met, and the environment-friendly effect is achieved.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides the heating device of the hot blast stove for full-time denitration, which has the advantages of good safety, convenient use and high flexibility.

The utility model provides a heating device of a hot blast stove for full-time denitration, which is realized by the following technical scheme and comprises a hot blast stove body, wherein a dividing wall type mixing barrel is arranged in the hot blast stove body, a combustion device is arranged in the dividing wall type mixing barrel, a flue gas inlet for extracting flue gas is arranged on the side surface of the dividing wall type mixing barrel, the hot blast stove body is provided with a combustion-supporting air elbow connector, the combustion device is axially inserted into the hot blast stove body from the combustion-supporting air elbow connector, and the rear part of the dividing wall type mixing barrel is connected with a flue gas mixing chamber.

After the scheme is adopted, the utility model designs the dividing wall type mixing barrel to isolate the combustion device from the flue gas introduced by the bypass and uses the flue gas mixing chamber connected with the rear part to mix the high-temperature flue gas and the low-temperature flue gas, and when the device is used, the whole device is arranged in a full-time denitration system between the upper flue of the hearth and the inlet flue of the tail denitration device.

Preferably, the combustion device comprises a combustion gun, a combustion cylinder and a fire detection device.

Preferably, the combustion gun is a natural gas gun or an oil gun. This preferred scheme design has designed two kinds of combustion methods, can adopt the natural gas ignition also can adopt the oil gun ignition, and two kinds of combustion methods can conveniently switch, select according to the on-the-spot demand.

Preferably, the hot primary air is introduced into the combustion-supporting air interface to serve as combustion-supporting air.

Preferably, the disturbance increasing device is arranged in the flue gas mixing chamber to enhance the mixing strength of the high-temperature flue gas and the low-temperature flue gas during combustion.

In conclusion, the hot blast stove heating device with a novel structure is designed, the SCR inlet smoke temperature is ensured to be more than 300 ℃ by putting the hot blast stove heating device for denitration in the full-time period in the starting, stopping and low-load operation stages of the boiler, the SCR operation rate of each stage is 100%, the requirement of future deep peak regulation can be met, the flexibility of unit participation peak regulation is increased, the peak regulation benefit is increased, and the hot blast stove heating device has the advantages of good safety, convenience in use and high flexibility.

Drawings

FIG. 1 is a schematic structural diagram of a heating device of a hot blast stove for full-time denitration according to the present invention;

shown in the figure:

1. the hot blast stove comprises a hot blast stove body, 2, a combustion gun, 3, a combustion cylinder, 4, a combustion-supporting air elbow connector, 5, a fire detection device, 6, a flue gas inlet, 7, a dividing wall type mixing cylinder, 8, a flue gas mixing chamber, 9 and a disturbance increasing 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 hot blast stove heating device for full-time denitration is provided, which comprises a hot blast stove body 1, a dividing wall type mixing barrel 7 is arranged inside the hot blast stove body 1, a combustion device is arranged in the dividing wall type mixing barrel 7, a flue gas inlet 6 for extracting flue gas is arranged on the side face of the dividing wall type mixing barrel, the hot blast stove body 1 is provided with a combustion-supporting air elbow connector 4, the combustion device is axially inserted into the hot blast stove body 1 from the combustion-supporting air elbow connector 4, and the rear part of the dividing wall type mixing barrel 7 is connected with a flue gas mixing chamber 8.

In this embodiment, the combustion apparatus includes a combustion gun 2, a combustion cylinder 3 and a fire detection device 5, the combustion gun 2 is a natural gas gun or an oil gun, a combustion-supporting air interface 4 is introduced with hot primary air as combustion-supporting air, and an interference increasing device 9 is installed in the flue gas mixing chamber 8.

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

1. The utility model provides a full-time hot-blast furnace heating device for denitration, includes hot-blast furnace body (1), its characterized in that, hot-blast furnace body (1) inside be equipped with dividing wall type mixing drum (7), dividing wall type mixing drum (7) in be equipped with burner and side and be equipped with flue gas entry (6) that are used for extracting the flue gas, hot-blast furnace body (1) is equipped with combustion-supporting wind elbow interface (4), burner insert hot-blast furnace body (1) inside from combustion-supporting wind elbow interface (4) axial, dividing wall type mixing drum (7) rear portion hookup have flue gas mixing chamber (8).

2. The hot blast stove heating device for full-time denitration according to claim 1, wherein the combustion device comprises a combustion lance (2), a combustion cylinder (3) and a fire detection device (5).

3. The heating device of the hot blast stove for full-time denitration according to claim 2, wherein the combustion lance (2) is a natural gas lance or an oil lance.

4. The heating device of the hot blast stove for denitration in the whole period according to claim 1, wherein the hot primary air is introduced into the elbow joint (4) of the combustion-supporting air as the combustion-supporting air.

5. The hot blast stove heating device for full-time denitration according to claim 1, wherein a disturbance increasing device (9) is installed in the flue gas mixing chamber (8) to enhance the mixing intensity of the high-temperature flue gas and the low-temperature flue gas.