CN117109019A

CN117109019A - Gas disturbance device and boiler system for flexible operation of coal-fired power plant

Info

Publication number: CN117109019A
Application number: CN202310900081.XA
Authority: CN
Inventors: 谭光伟; 卢凤银; 雷千禧
Original assignee: Energy Conservation Technology Beijing Co ltd
Current assignee: Energy Conservation Technology Beijing Co ltd
Priority date: 2023-07-20
Filing date: 2023-07-20
Publication date: 2023-11-24

Abstract

The application provides a gas disturbance device and a boiler system for flexible operation of a coal-fired power plant. The gas circulation disturbance device is used for a boiler system, the boiler system comprises a boiler and a dust remover, the boiler and the dust remover are communicated, the dust remover is located at the downstream of the boiler, the gas circulation disturbance device comprises a disturbance nozzle and a flue gas circulation pipeline, the disturbance nozzle is arranged in the boiler and comprises an input port and an output port, the input port is located at the outside of the boiler, and the output port is located at the inside of the boiler. One end of the smoke circulating pipeline is communicated with the downstream of the dust remover, the other end of the smoke circulating pipeline is communicated with the input port, and a fan for extracting smoke is arranged on the smoke circulating pipeline. According to the embodiment of the application, the burning rate of the pulverized coal can be effectively improved, the carbon content of fly ash is reduced, and the thermal efficiency of the boiler is improved.

Description

Gas disturbance device and boiler system for flexible operation of coal-fired power plant

Technical Field

The application relates to the technical field of thermal power generation, in particular to a gas disturbance device and a boiler system for flexible operation of a coal-fired power plant.

Background

Currently, in order to reduce the emission concentration of nitrogen oxides in a thermal power plant, a low-nitrogen combustion modification of a boiler system is required. The low-nitrogen combustion reforming method mainly comprises the step of performing air staged combustion, namely dividing the whole boiler into a main combustion zone, a reduction zone and a burn-out zone, wherein the burn-out zone is arranged at a high position, and a distance of 5 meters to 6 meters is reserved between the burn-out zone and the main combustion zone.

To reduce the emission concentration of the nitrogen oxide, only the air quantity of the main combustion zone can be reduced, so that the pulverized coal cannot burn out in the main combustion zone, and the rest of unburned pulverized coal needs to be combusted continuously in the burn-out zone. Because the wind speed of the burning zone is only the same as the wind speed of the secondary air under the influence of the pressure head of the fan, the speed cannot fully disturb the air of the burning zone, so that the air penetration effect is poor, the air cannot fully burn with the coal dust positioned in the burning zone, the burning degree of the coal dust is poor, the carbon content of fly ash is increased, and the thermal efficiency of the boiler is reduced after the low-nitrogen combustion transformation.

Disclosure of Invention

In view of the above problems, the application provides a gas disturbance device and a boiler system for flexible operation of a coal-fired power plant, which can effectively improve the coal dust burn-out rate, reduce the carbon content of fly ash and improve the thermal efficiency of the boiler.

In a first aspect, an embodiment of the present application provides a gas circulation disturbance device for flexible operation of a coal-fired power plant, where the gas circulation disturbance device is used in a boiler system, the boiler system includes a boiler and a dust remover that are connected, the dust remover is located at a downstream of the boiler, the gas circulation disturbance device includes a disturbance nozzle and a flue gas circulation pipe, the disturbance nozzle is disposed at the boiler, the disturbance nozzle includes an input port and an output port, the input port is located at an outside of the boiler, and the output port is located at an inside of the boiler. One end of the smoke circulating pipeline is communicated with the downstream of the dust remover, the other end of the smoke circulating pipeline is communicated with the input port, and a fan for extracting smoke is arranged on the smoke circulating pipeline.

In some embodiments of the first aspect, a regulating valve is further provided on the flue gas circulation pipeline, and the regulating valve is used for regulating the flue gas circulation flow.

In some embodiments of the first aspect, the perturbation nozzles are disposed in a burn-out zone of the boiler.

In some embodiments of the first aspect, the perturbation nozzle is connected to a fin of a water wall of the boiler.

In some embodiments of the first aspect, the outlet is flush with a side of the water wall proximate the boiler interior.

In some embodiments of the first aspect, the perturbation nozzle includes a tube body, a through hole extending along the length direction of the tube body is arranged in the tube body, one end of the through hole along the length direction is configured as an input port, and the other end is configured as an output port.

In some embodiments of the first aspect, the cross-section of the inner peripheral surface of the tube body is circular, rectangular, triangular or diamond shaped, and/or the cross-section of the outer peripheral surface of the tube body is circular, rectangular, triangular or diamond shaped.

In some embodiments of the first aspect, the inner diameter of the tube body has a decreasing trend along the direction from the input port to the output port.

In some embodiments of the first aspect, the injection direction of the perturbation nozzle is parallel to the injection direction of the combustion nozzle of the boiler.

In a second aspect, an embodiment of the present application provides a boiler system, the boiler system comprising a gas perturbation device provided in any embodiment of the first aspect.

The application provides a gas disturbance device and a boiler system, which are used for the boiler system. One end of the smoke circulating pipeline is communicated with the downstream of the dust remover, the other end of the smoke circulating pipeline is communicated with the input port, and a fan for extracting smoke is arranged on the smoke circulating pipeline. The flue gas circulation pipeline introduces cleaner flue gas into the disturbance nozzle from the downstream of the dust remover, the high-speed flue gas output by the disturbance nozzle can disturb the air in the boiler, the movement rate of the air in the boiler is improved, the air in the boiler can be fully mixed with pulverized coal for combustion, the pulverized coal burning rate can be effectively improved, the carbon content of fly ash is reduced, and the thermal efficiency of the boiler is improved.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 is a schematic diagram of a boiler system according to some embodiments of the present application;

FIG. 2 is a schematic view of a water wall of a boiler according to some embodiments of the present application;

FIG. 3 is a schematic view of a water wall of a boiler according to a second view angle according to some embodiments of the present application;

FIG. 4 is a schematic view of a first view of a perturbation nozzle according to some embodiments of the present application;

FIG. 5 is a schematic view of a second view of the perturbation nozzle of FIG. 4;

FIG. 6 is a schematic view of a first view of another perturbation nozzle according to some embodiments of the present application;

FIG. 7 is a schematic view of a second view of the perturbation nozzle of FIG. 6;

FIG. 8 is a schematic view of a first view of a perturbation nozzle according to some embodiments of the present application;

FIG. 9 is a schematic view of a second view of the perturbation nozzle of FIG. 8;

FIG. 10 is a schematic view of a first view of a perturbation nozzle according to some embodiments of the present application;

FIG. 11 is a schematic view of a second view of the perturbation nozzle of FIG. 10.

Reference numerals in the specific embodiments are as follows:

10. a perturbation nozzle; 11. an input port; 12. an output port; 20. a flue gas circulation duct; 30. a blower; 40. a regulating valve; 50. a combustion nozzle;

100. a boiler; 110. a main combustion zone; 120. a burn-out zone; 130. a water cooling wall; 131. a water-cooled tube; 132. fins; 133. a mounting port; 200. a dust remover; 300. and (5) a chimney.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.

It should be noted that unless otherwise indicated, technical or scientific terms used in the embodiments of the present application should be given the ordinary meanings as understood by those skilled in the art to which the embodiments of the present application belong.

In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom".

The references to orientation or positional relationships of "inner", "outer", "clockwise", "counter-clockwise", "axial", "radial", "circumferential", etc., are based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing embodiments of the present application and to simplify the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting embodiments of the present application.

Furthermore, the technical terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

In the description of embodiments of the application, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In order to solve the problems in the prior art, the embodiment of the application provides a gas disturbance device and a boiler system for flexible operation of a coal-fired power plant, which can effectively improve the burning rate of coal dust, reduce the carbon content of fly ash and improve the thermal efficiency of the boiler. The following first describes a gas perturbation device provided by an embodiment of the present application.

FIG. 1 is a schematic diagram of a boiler system according to some embodiments of the present application.

As shown in fig. 1, an embodiment of the present application provides a gas perturbation device for a boiler system, the boiler system comprises a boiler 100 and a dust remover 200 which are communicated, the dust remover 200 is located at the downstream of the boiler 100, the gas perturbation device comprises a perturbation nozzle 10 and a flue gas circulation pipeline 20, the perturbation nozzle 10 is arranged at the boiler 100, the perturbation nozzle 10 comprises an input port 11 and an output port 12, the input port 11 is located at the outside of the boiler 100, and the output port 12 is located at the inside of the boiler 100. One end of the smoke circulation pipeline 20 is communicated with the downstream of the dust remover 200, the other end of the smoke circulation pipeline 20 is communicated with the input port 11, and a fan 30 for extracting smoke is arranged on the smoke circulation pipeline 20.

The boiler system comprises a boiler 100 and a dust remover 200 which are communicated, the dust remover 200 is positioned at the downstream of the boiler 100, and flue gas generated after the pulverized coal in the boiler 100 is combusted is conveyed to a chimney 300 through a pipeline and then is discharged to the atmosphere. The dust remover 200 is connected between the boiler 100 and the chimney 300, and the dust remover 200 can adsorb particles and harmful substances in the flue gas generated after the pulverized coal is combusted, so that the flue gas is purified, the flue gas discharged from the chimney 300 to the atmosphere is cleaner, and the environment is prevented from being polluted. Alternatively, the duster 200 may be an electrostatic precipitator.

In the embodiment of the present application, the perturbation nozzle 10 of the gas perturbation device is connected to the boiler 100, the input port 11 of the perturbation nozzle 10 is positioned outside the boiler 100 and connected to the flue gas circulation pipeline 20, and the output port 12 of the perturbation nozzle 10 is positioned inside the boiler 100 for injecting flue gas into the inside of the boiler 100. One end of the flue gas circulation pipe 20 is communicated with a flue gas pipe at the downstream of the dust remover 200, and a fan 30 for extracting flue gas is arranged on the flue gas circulation pipe 20, and the flue gas circulation pipe 20 can extract the flue gas purified by the dust remover 200 from the downstream of the dust remover 200 and jet the flue gas into the boiler 100 through the disturbance nozzle 10.

Alternatively, blower 30 may be, but is not limited to, a centrifugal blower, an axial flow blower, a diagonal flow blower, a cross flow blower, or the like.

It should be noted that, the flue gas extraction point of the flue gas circulation pipeline 20 may be a flue downstream of the dust remover 200, or may be a clean flue downstream of the desulfurizing tower of the boiler system, and the specific position of the flue gas extraction point of the flue gas circulation pipeline 20 is not limited in the present application. For convenience and description, the present application will be described by taking the flue gas extraction point of the flue gas recirculation duct 20 as the flue downstream of the dust collector 200.

Illustratively, the flue gas circulation pipeline 20 introduces cleaner flue gas into the disturbance nozzle 10 from the downstream of the dust remover 200, and the high-speed flue gas output by the disturbance nozzle 10 can disturb the air in the boiler 100, so as to improve the movement rate of the air in the boiler 100, enable the air in the boiler 100 to be fully mixed with pulverized coal for combustion, further effectively improve the pulverized coal burn-out rate, reduce the carbon content of fly ash and improve the thermal efficiency of the boiler 100.

Alternatively, the wind pressure of the blower 30 is set at 8 to 15kPa, for example, the wind pressure of the blower 30 may be, but not limited to, 8kPa, 9kPa, 10kPa, 15kPa.

Alternatively, the ejection speed of the output port 12 of the perturbation nozzle 10 is set at 60 to 150m/s, for example, the ejection speed of the output port 12 of the perturbation nozzle 10 may be, but is not limited to, 60m/s, 80m/s, 100m/s, 120m/s, 150m/s.

Alternatively, the connection mode of the disturbance nozzle 10 and the boiler 100 may be, but not limited to, bolting, welding or clamping, etc., and the present application is not limited to the specific connection mode of the disturbance nozzle 10 and the boiler 100, and may be selected according to practical situations.

Alternatively, the perturbation nozzle 10 may be made of a material having corrosion and wear resistant properties and being resistant to temperatures exceeding 1000 ℃, such as iron-nickel based heat resistant alloys, silicon carbide or tungsten, etc., to ensure that it is not burned out by the high temperature flame inside the boiler 100. So that the disturbance nozzle 10 has a long service period and a small maintenance workload.

Alternatively, the number of the disturbance nozzles 10 may be one, two or more, and the present application is not limited to the specific number of the disturbance nozzles 10 and may be selected according to practical situations. When the number of the disturbance nozzles 10 is plural, the plural disturbance nozzles 10 are arranged at intervals around the circumference of the boiler 100, and the input ports 11 of the plural disturbance nozzles 10 are commonly communicated with one flue gas circulation duct 20.

In the above technical scheme, by arranging the gas disturbance device, the air in the boiler 100 can be disturbed, so that the air in the boiler 100 can be fully mixed with pulverized coal for combustion, the pulverized coal burning rate can be effectively improved, the carbon content of fly ash is reduced, and the thermal efficiency of the boiler 100 is improved.

It should be noted that, the gas disturbance device is an independent structure, and does not interfere with the original combustion system of the boiler system, so that the gas disturbance device can be used or commonly used according to the running condition of the boiler 100 system, so that the gas disturbance device has higher flexibility.

In some embodiments, the flue gas circulation pipeline 20 is further provided with a regulating valve 40, and the regulating valve 40 is used for regulating the flue gas circulation flow.

Alternatively, the regulating valve 40 may be disposed between the blower 30 and the disturbance nozzle 10, or may be disposed between the blower 30 and a flue gas duct downstream of the dust collector 200.

Optionally, the adjusting valve 40 may be a pneumatic adjusting valve 40, an electric adjusting valve 40, or a self-operated adjusting valve 40, where the pneumatic adjusting valve 40 is operated by compressed air, and the area of the fluid passage is adjusted by a signal transmitted from the controller to change the fluid flow; the electric control valve 40 is manufactured by combining electric execution equipment and a control valve 40 door, and is used for receiving a control signal based on electric power and adjusting the size of the valve so as to achieve the purposes of changing the flow, the temperature, the pressure and the like in a pipeline; the self-operated regulating valve 40 can directly call the medium capacity to complete the dry work, and can regulate the temperature, flow and pressure by itself.

Alternatively, the operator can control the control valve 40 so that the amount of flue gas drawn from the pipe downstream of the dust collector 200 by the gas perturbation device is controlled to be 2-6% of the total amount of flue gas combusted in the boiler system, so as to reduce the influence on the operation of the original boiler system. For example, the ratio of the amount of flue gas drawn by the gas perturbation device from the conduit downstream of the duster 200 to the total amount of flue gas combusted by the boiler system may be, but is not limited to, 0.02, 0.03, 0.04, 0.05, 0.06, etc.

In the above technical scheme, the adjusting valve 40 is arranged on the flue gas circulation pipeline 20, and the adjusting valve 40 can adjust the flue gas flow in the flue gas circulation pipeline 20, so that an operator can flexibly control the flue gas amount extracted by the gas disturbance device and the flue gas speed output by the disturbance nozzle 10, so as to meet the requirements of different use environments, and effectively improve the applicability and flexibility of the gas disturbance device

In some embodiments, the perturbation nozzles 10 are disposed in the burn-out zone 120 of the boiler 100.

In an embodiment of the present application, in order to reduce the concentration of nitrogen oxides discharged from the boiler system, the boiler 100 is configured to include at least a main combustion zone 110 and a burn-out zone 120 for air staged combustion. That is, the air amount of the main combustion zone 110 is reduced, the pulverized coal cannot be burned in the main combustion zone 110, and the remaining unburned pulverized coal continues to be burned in the burn-out zone 120 to reduce the emission concentration of the nitrogen oxide. Alternatively, the main combustion zone 110 and the ember zone 120 may be adjacently disposed, with the ember zone 120 being located 5 meters to 6 meters above the main combustion zone 110.

It should be noted that, because the air speed of the burnout zone 120 is only the same as the air speed of the secondary air due to the influence of the pressure head of the fan 30, the air speed cannot sufficiently disturb the air of the burnout zone 120, so that the air penetration effect is poor, the air cannot sufficiently burn with the pulverized coal located in the burnout zone 120, the burnout degree of the pulverized coal is poor, the carbon content of the fly ash is increased, and the thermal efficiency of the boiler 100 is reduced after the low-nitrogen combustion is improved.

In this way, by arranging the disturbance nozzle 10 in the burnout zone 120 of the boiler 100, the disturbance nozzle 10 can purposefully disturb the air in the burnout zone 120 of the boiler 100, so that the mixing efficiency of the air in the burnout zone 120 of the boiler 100 and the pulverized coal is further improved, the pulverized coal burnout rate in the burnout zone 120 of the boiler 100 can be further effectively improved, the carbon content in fly ash is reduced, and the thermal efficiency of the boiler 100 is improved.

Fig. 2 is a schematic view illustrating a first view of the water wall 130 of the boiler 100 according to some embodiments of the present application, and fig. 3 is a schematic view illustrating a second view of the water wall 130 of the boiler 100 according to some embodiments of the present application.

With continued reference to fig. 2-3, in some embodiments, the perturbation nozzles 10 are connected to fins 132 of the water wall 130 of the boiler 100.

Illustratively, the boiler 100 is provided with a water wall 130 inside, the water wall 130 includes a plurality of water-cooled tubes 131 arranged side by side, and the plurality of water-cooled tubes 131 are connected by fins 132. By forming the mounting opening 133 on the fin 132, the perturbation nozzle 10 is inserted into the mounting opening 133, so that the perturbation nozzle 10 is fixedly connected to the fin 132 of the water-cooled wall 130.

Alternatively, the connection manner of the perturbation nozzle 10 and the fins 132 of the water wall 130 may be, but not limited to, bolting, welding or clamping, and the application is not limited to the specific connection manner of the perturbation nozzle 10 and the fins 132 of the water wall 130, and may be selected according to practical situations.

In the above technical solution, the disturbance nozzle 10 is connected to the fins 132 of the water wall 130 of the boiler 100, so that the installation of the disturbance nozzle 10 can be completed without replacing the existing water wall 130 or adding other components in the boiler 100, which is simple and fast and is beneficial to reducing the cost.

In some embodiments, the injection direction of the perturbation nozzle 10 is parallel to the injection direction of the combustion nozzle 50 of the boiler 100.

As above, in the embodiment of the present application, in order to reduce the concentration of nitrogen oxides discharged from the boiler system, the boiler 100 is configured to include at least the main combustion zone 110 and the ember zone 120 for air staged combustion. That is, the air amount of the main combustion zone 110 is reduced, the pulverized coal cannot be burned in the main combustion zone 110, and the remaining unburned pulverized coal continues to be burned in the burn-out zone 120 to reduce the emission concentration of the nitrogen oxide.

Illustratively, a combustion nozzle 50 is provided in the main combustion zone 110 of the boiler 100, the combustion nozzle 50 being for providing a flow of pulverized coal to the interior of the boiler 100 for combustion within the boiler 100. The combustion nozzle 50 has a preset injection direction, so that the pulverized coal airflow injected by the combustion nozzle 50 forms a swirl, and the air and the pulverized coal can be fully mixed, so as to improve the combustion effect of the pulverized coal.

Optionally, the primary combustion zone 110 includes a plurality of combustion nozzles 50. Alternatively, the number of the combustion nozzles 50 may be one, two or more, and the present application is not limited to the specific number of the combustion nozzles 50 and may be selected according to practical situations. When the number of the combustion nozzles 50 is plural, the plural combustion nozzles 50 are arranged at intervals around the circumference of the boiler 100.

In the above technical solution, the injection direction of the disturbance nozzle 10 is parallel to the injection direction of the combustion nozzle 50 of the boiler 100, so that the flue gas injected by the disturbance nozzle 10 and the pulverized coal airflow injected by the combustion nozzle 50 have the same flow path, which can reduce the influence of the disturbance nozzle 10 on the original combustion preventing system of the boiler 100, and effectively improve the reliability of the gas disturbance device.

In some embodiments, the outlet 12 is flush with a side of the water wall 130 that is adjacent to the interior of the boiler 100.

Illustratively, in the boiler 100, the output port 12 of the disturbance nozzle 10 is flush with the water-cooled wall 130 near one side of the boiler 100, so that the output port 12 of the disturbance nozzle 10 does not occupy the original combustion space in the boiler 100, the influence of the disturbance nozzle 10 on the original combustion preventing system of the boiler 100 can be further reduced, and the reliability of the gas disturbance device is further improved.

Fig. 4 is a schematic diagram of a first view structure of a perturbation nozzle 10 according to some embodiments of the present application, fig. 5 is a schematic diagram of a second view structure of the perturbation nozzle 10 shown in fig. 4, fig. 6 is a schematic diagram of a first view structure of another perturbation nozzle 10 according to some embodiments of the present application, and fig. 7 is a schematic diagram of a second view structure of the perturbation nozzle 10 shown in fig. 6.

With continued reference to fig. 4-7, in some embodiments, the perturbation nozzle 10 comprises a tube body having a through-hole extending along the length of the tube body, the through-hole being configured at one end along its length as an input port 11 and at the other end as an output port 12.

Illustratively, the through hole is a transport passage of the flue gas, and the flue gas enters the inside of the through hole from one end of the flue gas circulation duct 20 through the through hole, and is then outputted to the inside of the boiler 100 from the other end of the through hole. By providing the perturbation nozzle 10 as a tube, a simple construction is advantageous for cost reduction.

Alternatively, the shape of the cross section of the inner peripheral surface of the tube body may be, but is not limited to, circular, rectangular, triangular or diamond, and the shape of the cross section of the outer peripheral surface of the tube body may be, but is not limited to, circular, rectangular, triangular or diamond.

Fig. 8 is a schematic view of a first view structure of a perturbation nozzle 10 according to some embodiments of the present application, fig. 9 is a schematic view of a second view structure of the perturbation nozzle 10 shown in fig. 8, fig. 10 is a schematic view of a first view structure of a perturbation nozzle 10 according to some embodiments of the present application, and fig. 11 is a schematic view of a second view structure of the perturbation nozzle 10 shown in fig. 10.

With continued reference to fig. 8-11, in some embodiments, the internal diameter of the tube body has a gradual decreasing trend along the direction of the input port 11 to the output port 12.

Illustratively, the flue gas in the flue gas circulation pipeline 20 enters the pipe body from the inlet 11 with a larger diameter and width, and the inner diameter and width of the pipe body gradually decrease along the direction from the inlet 11 to the outlet 12, so that the cross-sectional area of the flue gas in the process of passing through the through holes gradually decreases, and the flue gas rate in the flue gas circulation pipeline 20 is constant, so that the rate of the flue gas in the process of passing through the through holes gradually increases, and further, the flue gas rate output by the outlet 12 of the disturbance nozzle 10 can be increased, the disturbance effect of the gas disturbance device on the air in the boiler 100 can be further improved, and the thermal efficiency of the boiler 100 can be further improved.

According to some embodiments of the present application, the present application also provides a boiler system comprising the gas perturbation device of any one of the above aspects.

It may be appreciated that the boiler system includes the gas disturbance device provided in the embodiment of the present application, and specific details of the gas disturbance device may be referred to the description of corresponding parts in the gas disturbance device described in the embodiment of the present application, which is not repeated herein for brevity.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A gas circulation perturbation device for flexible operation of a coal-fired power plant for a boiler system, the boiler system comprising a boiler and a dust remover in communication, the dust remover being located downstream of the boiler, the gas circulation perturbation device comprising:

the disturbance nozzle is arranged in the boiler and comprises an input port and an output port, the input port is positioned outside the boiler, and the output port is positioned inside the boiler;

and one end of the smoke circulating pipeline is communicated with the downstream of the dust remover, the other end of the smoke circulating pipeline is communicated with the input port, and a fan for extracting smoke is arranged on the smoke circulating pipeline.

2. The gas circulation perturbation device of claim 1, wherein the flue gas circulation conduit is further provided with a regulating valve, and the regulating valve is used for regulating the flow rate of the flue gas circulation.

3. The gas circulation perturbation device of claim 1, wherein the perturbation nozzle is disposed in a burnout zone of the boiler.

4. The gas circulation perturbation device of claim 1, wherein the perturbation nozzle is connected to fins of a water wall of the boiler.

5. The gas circulation perturbation device of claim 4, wherein the output port is flush with a side of the water wall proximate the boiler interior.

6. The gas circulation perturbation device according to claim 1, wherein the perturbation nozzle comprises a tube body, a through hole extending along the length direction of the tube body is arranged in the tube body, one end of the through hole along the length direction is configured as the input port, and the other end is configured as the output port.

7. The gas circulation perturbation device of claim 6, wherein the cross-section of the inner peripheral surface of the tube body is circular, rectangular, triangular or diamond shaped in shape, and/or,

the cross section of the outer peripheral surface of the pipe body is round, rectangular, triangular or diamond.

8. The gas circulation perturbation device of claim 6, wherein the internal diameter of the tube body is tapered in a direction from the inlet port to the outlet port.

9. The gas circulation perturbation device of claim 1, wherein the perturbation nozzle has an injection direction parallel to the injection direction of the combustion nozzle of the boiler.

10. A boiler system, characterized by comprising a gas perturbation device according to any one of claims 1-9.