A burner system suitable for deep peaking

Abstract

A burner system suitable for deep peak shaving includes a dual-purpose burner for both coal combustion and burnout, located directly below and above a pulverized coal burner. The combustion system's air box includes a pulverized coal burner air box and a dual-purpose burner air box. The pulverized coal burner air box is connected to the pulverized coal burner, and the dual-purpose burner air box is connected to both the dual-purpose burner and the burnout air burner. The dual-purpose burner is arranged in the burnout air area of ​​the furnace. By opening or closing the pulverized coal pipeline of the dual-purpose burner, it can flexibly function as both a pulverized coal burner and a burnout air burner depending on the unit load, ensuring that the main reheat steam temperature under low load and the NOx generated by combustion under high load meet design requirements.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of power station boiler combustion system, and particularly relates to a burner system suitable for deep peak shaving. BACKGROUND

[0002] In recent years, with the rapid growth of wind power, photovoltaic and other new energy generating units, there are serious problems of wind and light abandonment in some areas. Although the overall wind abandonment rate has been reduced through power system optimization and adjustment, it is still relatively high. Based on this, the local governments have also introduced the operation rules of the power auxiliary service market, and through the reward and punishment means, the thermal power units are guided to improve the operation flexibility to solve the problems of peak shaving, heating, renewable energy consumption and other outstanding problems in power operation.

[0003] The main characteristics of deep peak shaving operation of thermal power units are: (1) The utilization hours of the unit are reduced, and large-capacity units are often operated at low load. The low load rate leads to lower main steam temperature and reheat steam temperature than the design value, which affects the economic operation of the unit. For example, when a 300MW unit is at 110MW load (36.7% load rate), the main and reheat steam temperatures are 524℃ and 518℃ respectively, which are 16℃ and 22℃ lower than the design value respectively, affecting the power generation coal consumption by 1.44g / (kW·h) and 1.32g / (kW·h) respectively; when a 300MW unit is at a load lower than 210MW, the reheat steam temperature is 525℃-530℃, which is about 10℃-15℃ different from the design value, which increases the power generation coal consumption by about 0.75g / (kW·h)-1.13g / (kW·h).(2) The AGC command fluctuates frequently, and the AGC variable load rate is fast, which leads to the main steam pressure tracking not timely, and there is a situation of mismatch between the main steam pressure and the main steam temperature, and the steam temperature automatic tracking and adjusting performance is poor.

[0004] The platen superheater, high-temperature superheater and high-temperature reheater of the boiler are arranged at the furnace outlet, above the elbow angle and in the horizontal flue respectively, and the heat transfer mode of the heating surface is radiation type, semi-radiation type, semi-convection type and convection type. The unit main steam temperature and reheat steam temperature regulation is related to the amount of flue gas generated by combustion and the flue gas temperature. When the unit is operated at low load, the amount of flue gas generated by combustion is relatively stable due to the relatively fixed amount of coal and total air volume. Therefore, to improve the main and reheat steam temperature at low load, the flue gas temperature at the furnace outlet needs to be increased. Domestic research institutions and manufacturers have proposed technical transformation routes such as burner stable combustion, coal powder distributor, wide load denitration technology, low-pressure cylinder zero output and energy storage for the deep peak shaving and flexibility operation adaptability of coal-fired thermal power units. Through the implementation of technical transformation, the minimum output of coal-fired thermal power units is reduced, and the deep peak shaving capacity is improved. However, there is less research on the economic efficiency of units under deep peak shaving operation mode. Although through the operation of the upper coal mill, the optimization of air distribution and the reduction of coal powder fineness, the unit steam temperature is improved at low load, but the steam temperature improvement capacity is limited. SUMMARY

[0005] The present application aims to provide a burner system suitable for deep peak shaving.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solution:

[0007] The present application is a burner system suitable for deep peak shaving, which comprises a combustion system air bellow, a coal-burning and burnout dual-purpose burner, a pulverized coal burner and a burnout air burner; the coal-burning and burnout dual-purpose burner is located directly below the burnout air burner; the coal-burning and burnout dual-purpose burner is located directly above the pulverized coal burner; the combustion system air bellow comprises a pulverized coal burner air bellow and a coal-burning and burnout dual-purpose burner air bellow; the pulverized coal burner air bellow is connected with the pulverized coal burner; the coal-burning and burnout dual-purpose burner air bellow is connected with the coal-burning and burnout dual-purpose burner and the burnout air burner; the coal-burning and burnout dual-purpose burner is connected with a dual-purpose burner pulverized coal pipeline.

[0008] The present application is further improved in that a coal fire detection device is arranged on the coal-burning and burnout dual-purpose burner; the coal-burning and burnout dual-purpose burner is arranged 5-8 m above the pulverized coal burner.

[0009] The present application is further improved in that a pulverized coal injection port is arranged on the coal-burning and burnout dual-purpose burner; the pulverized coal injection port is connected with the dual-purpose burner pulverized coal pipeline; the dual-purpose burner pulverized coal pipeline is connected with a pulverized coal pipeline at an outlet of a coal mill; the pulverized coal pipeline at the outlet of the coal mill is connected with the coal mill.

[0010] The present application is further improved in that an outer diameter of the dual-purpose burner pulverized coal pipeline is 1 / 5-1 / 4 of an outer diameter of the pulverized coal pipeline at the outlet of the coal mill; a material of the dual-purpose burner pulverized coal pipeline is Q235 steel.

[0011] The present application is further improved in that a coal mill side coal lock gate, an adjustable contraction hole, a wave-shaped compensator and a burner side coal lock gate are arranged in sequence on the dual-purpose burner pulverized coal pipeline.

[0012] The present application is further improved in that an inlet elbow is arranged at an inlet of the pulverized coal injection port.

[0013] The present application is further improved in that, when applied to a tangentially fired boiler, the pulverized coal injection port is arranged between a lowermost layer SOFA burner injection port and a lower layer SOFA burner injection port; a first pulverized coal concentrator is arranged in the pulverized coal injection port; the first pulverized coal concentrator comprises a concentrator shell; a partition plate is arranged in the concentrator shell; and a concentration vane is arranged between the concentrator shell and the partition plate.

[0014] The present application is further improved in that an area of the pulverized coal injection port is 1 / 5-1 / 4 of an area of the pulverized coal burner injection port; and a swing actuating mechanism is arranged in the pulverized coal injection port.

[0015] Further improvement of the present application is that when applied to a coal-fired and burnout dual-purpose burner of a tangentially fired boiler, a center air nozzle and a burnout air nozzle are further arranged, the pulverized coal nozzle, the center air nozzle and the burnout air nozzle are concentric circle structures, and from inside to outside, they are the pulverized coal nozzle, the center air nozzle and the burnout air nozzle respectively; the pulverized coal nozzle is arranged with a conical pulverized coal concentrator; the pulverized coal nozzle is made of heat-resistant steel, the outer diameter of the pulverized coal nozzle is 1 / 5-1 / 4 of the nozzle of the pulverized coal burner, and the end of the pulverized coal nozzle is arranged with a tooth-shaped annular stable combustion ring made of ceramic; the center air nozzle is straight-flow air, and the burnout air nozzle is rotational flow air, and the air duct corresponding to the burnout air nozzle is provided with rotational flow blades.

[0016] Further improvement of the present application is that the coal-fired and burnout dual-purpose burner comprises a cover plate, and the cover plate is provided with a center air adjusting device and rotational flow blade adjusting devices.

[0017] Compared with the prior art, the present application has the beneficial effects that: the coal-fired and burnout dual-purpose burner is arranged in the burnout air area of the furnace, and by opening or closing the pulverized coal pipeline of the dual-purpose burner, the coal-fired and burnout dual-purpose burner can flexibly serve as a pulverized coal burner or a burnout air burner according to different loads of the unit, so that the main and reheat steam temperatures under medium and low loads and the NOx generated by combustion under high loads can meet the design value requirements. When the unit is operated under medium and low loads, the coal gate on the pulverized coal pipeline of the dual-purpose burner is opened, at this time, the coal-fired and burnout dual-purpose burner serves as a small pulverized coal burner, and since the coal-fired and burnout dual-purpose burner is arranged above the pulverized coal burner, the pulverized coal is combusted under the organization of the coal-fired and burnout dual-purpose burner, the center height of the furnace flame is lifted, the flue gas temperature at the furnace outlet is increased, and the main and reheat steam temperatures under medium and low loads of the unit can meet the design value requirements. When the unit is operated under high loads, the main and reheat steam temperatures can meet the design value, at this time, the coal gate on the pulverized coal pipeline of the dual-purpose burner is closed, the coal-fired and burnout dual-purpose burner serves as a burnout air burner, and the air staging combustion can reduce the NOx generated by combustion.

[0018] Further, since the coal-fired and burnout dual-purpose burner is arranged 5-8 m above the pulverized coal burner, a small amount of pulverized coal is combusted under the organization of the coal-fired and burnout dual-purpose burner, the center height of the furnace flame is lifted, and the main and reheat steam temperatures under medium and low loads of the unit can meet the design value requirements. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of the burner system suitable for deep peak regulation of the present application;

[0020] Figure 2 It is a schematic diagram of the pulverized coal pipeline arrangement of the present application;

[0021] Figure 3 The pulverized coal nozzle of the dual-purpose burner for tangentially-fired boiler and circular-fired boiler of the present application;

[0022] Figure 4 The front view and side view schematic diagram of the dual-purpose burner for coal combustion and burnout and the SOFA burner of the tangentially-fired boiler of the present application; wherein (a) is the front view and (b) is the side view;

[0023] Figure 5 The schematic diagram of the burner system arrangement of the tangentially-fired boiler of the present application;

[0024] Figure 6 The schematic diagram of the dual-purpose burner structure of the opposed-fired boiler of the present application;

[0025] Figure 7 The schematic diagram of the nozzle of the dual-purpose burner of the opposed-fired boiler of the present application.

[0026] Wherein, 1 is the dual-purpose burner for coal combustion and burnout, 2 is the pulverized coal burner, 3 is the burnout air burner, 4 is the wind box of the pulverized coal burner, 5 is the wind box of the dual-purpose burner for coal combustion and burnout, 6 is the pulverized coal pipeline of the dual-purpose burner, 7 is the pulverized coal pipeline at the outlet of the coal mill, 8 is the wave compensator, 9 is the adjustable orifice, 10 is the side coal gate of the burner, 11 is the side coal gate of the coal mill, 12 is the coal mill, 13 is the pulverized coal nozzle, 14 is the first pulverized coal concentrator, 15 is the concentrator shell, 16 is the concentration blade, 17 is the middle partition plate, 18 is the swing actuator, 19 is the SOFA burner nozzle, 20 is the inlet elbow, 21 is the central air nozzle, 22 is the burnout air nozzle, 23 is the stable combustion ring, 24 is the cyclone blade, 25 is the central air adjusting device, 26 is the cyclone blade adjusting device, and 27 is the conical pulverized coal concentrator. DETAILED DESCRIPTION

[0027] The present application will be further described in detail below with reference to the accompanying drawings.

[0028] Referring to Figure 1 The burner system suitable for deep peak shaving of the present application comprises the combustion system wind box, the dual-purpose burner for coal combustion and burnout, the pulverized coal burner and the burnout air burner. The dual-purpose burner for coal combustion and burnout is arranged immediately below the burnout air burner. The dual-purpose burner for coal combustion and burnout is arranged immediately above the pulverized coal burner, and the vertical distance between the dual-purpose burner for coal combustion and burnout and the pulverized coal burner is about 5m to 8m, which varies with the capacity of the boiler. The combustion system wind box comprises the wind box of the pulverized coal burner and the wind box of the dual-purpose burner for coal combustion and burnout. The wind box of the pulverized coal burner is connected with the pulverized coal burner for providing secondary air for the pulverized coal burner. The wind box of the dual-purpose burner for coal combustion and burnout is connected with the dual-purpose burner for coal combustion and burnout and the burnout air burner for providing air for the dual-purpose burner for coal combustion and burnout and the burnout air burner.

[0029] The coal combustion and burn-off dual-purpose burner is further provided with a coal fire detection device, and is incorporated into a boiler furnace safety monitoring system.

[0030] Referring to Figure 1 , the coal combustion and burn-off dual-purpose burner is provided with a coal powder injection port. Figure 2 The coal powder injection port is connected with a dual-purpose burner coal powder pipeline, which is led from the lowermost coal mill.

[0031] The dual-purpose burner coal powder pipeline is sequentially provided with a coal mill side coal gate, an adjustable contraction hole, a wave-shaped compensator and a burner side coal gate.

[0032] The coal powder injection port is provided with an inlet elbow 20 at the inlet thereof.

[0033] When applied to tangentially fired boilers, the coal combustion and burn-off dual-purpose burner is arranged between the lowermost SOFA burner injection port and the next lower SOFA burner injection port. Figure 3 The first coal powder concentrator is composed of a concentrator shell, concentrator blades and a partition plate.

[0034] When applied to opposed firing boilers, the coal combustion and burn-off dual-purpose burner is further provided with a central air injection port and a burn-off air injection port. Figure 6 The coal powder injection port, the central air injection port and the burn-off air injection port are in a concentric circle structure, and from the inside to the outside, they are the coal powder injection port, the central air injection port and the burn-off air injection port. Figure 4 The coal powder injection port is provided with a conical coal powder concentrator. Figure 5 The coal powder injection port is provided with a swing actuating mechanism, which can swing up and down and left and right with the SOFA burner injection port.

[0035] When applied to opposed firing boilers, the coal combustion and burn-off dual-purpose burner is further provided with a central air injection port and a burn-off air injection port. Figure 6 The coal powder injection port is provided with a conical coal powder concentrator. Figure 7The end of the coal powder injection port is provided with a ceramic material tooth-shaped annular stable combustion ring; the center air injection port and the overfire air injection port take air from the air box of the coal burning and overfire dual-purpose burner, the center air injection port is straight air, and the overfire air injection port is rotational flow air.

[0036] The traditional low-nitrogen combustion mode mainly adopts the air staging combustion mode, that is, about 80% of air is sent into the furnace through the main combustion area, the excess air coefficient of the main combustion area is less than 1, which is oxygen-lacking combustion, so that the flame temperature of the main combustion area is controlled, thereby the generation amount of thermal type and fuel type NOx is inhibited; about 20% of air is sent into the furnace through the overfire area located above the main combustion area by 5m-9m, the overfire air area is oxygen-rich combustion with the excess air coefficient greater than 1, since the air temperature of the overfire area is about 300 DEG C, the air temperature is lower than the flue gas temperature in the furnace, so that the flame temperature is reduced, and too much NOx is not generated x . The traditional low-nitrogen combustion mode boiler is provided with a coal powder burner in the main combustion area and an overfire air burner in the overfire air area. When the unit is deeply adjusted and operated at a low load, since the amount of coal is small, the amount of flue gas generated by combustion is small, so that the combustion heat of the main combustion area is taken out by increasing the air supply amount of the main combustion area and reducing the air supply amount of the overfire air area, so as to improve the main reheat steam temperature at a low load.

[0037] The present application replaces the lowermost overfire air burner of the traditional low-nitrogen combustion mode boiler with a coal burning and overfire dual-purpose burner, and the arrangement position is the same as that of the traditional lowermost overfire air burner; the structures and arrangement positions of the remaining coal powder burners and overfire air burners are the same as those of the traditional low-nitrogen combustion boiler, so that the characteristics of the high arrangement of the dual-purpose burner can be fully utilized, and the height of the flame center can be flexibly adjusted.

[0038] When the unit is in low load operation, the dual-purpose burner coal pipe burner side and the coal gate of the coal mill side are opened, at this time the dual-purpose burner is similar to a small pulverized coal burner, by adjusting the secondary air distribution mode of the dual-purpose burner, the pulverized coal combustion of the dual-purpose burner is organized, most of the pulverized coal is combusted through the pulverized coal burner located in the main combustion area, when the flue gas flows through the overfire air area, a small amount of pulverized coal is combusted through the dual-purpose burner, since the dual-purpose burner is located at the lowermost overfire air burner level of the traditional low-nitrogen combustion mode boiler, it is arranged at a higher position in the furnace, can raise the flame center height, improve the flue gas temperature at the furnace outlet, and since the total air volume of the boiler is basically unchanged, the NOx generated by combustion is basically the same as that of the traditional combustion mode, and the purpose of improving the main steam temperature and the reheat steam temperature can be achieved when the unit load;

[0039] When the unit is in high load operation, the flue gas generated by combustion is more, the main steam temperature and the reheat steam temperature of the unit can meet the design value requirement, therefore the coal gate of the dual-purpose burner coal pipe burner side and the coal mill side is closed, at this time the dual-purpose burner is similar to an overfire air burner, only the secondary air passes through the dual-purpose burner to the furnace, and the purpose of reducing the NOx generated by combustion is achieved through the air staging combustion technology.

[0040] By opening and closing the coal gate of the dual-purpose burner coal pipe burner side and the coal mill side, the dual-purpose burner can be adjusted to be an overfire air burner or a small pulverized coal burner according to the high or low unit load, and the purposes of low-nitrogen combustion and improving the flue gas temperature at the furnace outlet are realized online, and the operation requirements of deep adjustment can be better adapted.

[0041] Since there is deviation in the resistance along the dual-purpose burner coal pipe at different positions, the pulverized coal wind speed in the coal pipe is not uniform, therefore adjustable orifices are arranged on the dual-purpose burner coal pipe, by adjusting the opening degree of each adjustable orifice, the wind speed deviation between the dual-purpose coal pipes is balanced within ±5%. Wave compensators are arranged on the dual-purpose burner coal pipe, which can absorb the expansion amount of the coal pipe under the hot state.

[0042] A pulverized coal concentrator is arranged in the pulverized coal nozzle of the dual-purpose burner, the pulverized coal gas flow entering the dual-purpose burner is divided into a dense pulverized coal gas flow and a dilute pulverized coal gas flow, the main function is to improve the stable combustion capacity of the burner under low load and inhibit the generation of NOx. When applied to tangentially fired boilers, the pulverized coal concentrator comprises a concentrator shell, a concentration blade and a partition plate, when applied to opposed firing boilers, the pulverized coal concentrator is arranged at the position close to the furnace end of the pulverized coal nozzle, and is used for concentrating the pulverized coal gas flow before it enters the furnace.

[0043] The utility model relates to a coal and burnout dual-purpose burner of a coal-fired opposed firing boiler, wherein the central air jet is straight flow air, the burnout air jet is rotational flow air, the outer ring corresponding to the burnout air jet is provided with rotational flow vanes, the burner cover is provided with a central air adjusting device and a rotational flow vane adjusting device, the central air adjusting device is used to adjust the air volume of the central air jet of the coal and burnout dual-purpose burner of the coal-fired opposed firing boiler, and the rotational flow vane adjusting device is used to adjust the air volume and rotational flow intensity of the burnout air of the coal and burnout dual-purpose burner of the coal-fired opposed firing boiler.

[0044] The coal powder jet of the coal and burnout dual-purpose burner of the coal-fired opposed firing boiler is provided with a tooth-shaped annular stable combustion ring made of ceramic, which mainly forms a backflow zone near the coal powder jet to make the coal powder ignite rapidly after leaving the jet and accelerate the coal powder combustion rate.

[0045] The combustion system air box is divided into a coal powder burner air box and a coal and burnout dual-purpose burner air box, which respectively supply air to the coal powder burner and the coal and burnout dual-purpose burner.

[0046] The coal and burnout dual-purpose burner is arranged in the burnout air area of the furnace, and by opening or closing the coal gate on the coal powder pipeline of the dual-purpose burner, the coal and burnout dual-purpose burner can flexibly function as a coal powder burner or a burnout air burner according to different unit loads, so as to ensure that the main and reheat steam temperature at low load and the NOx generated by combustion at high load can meet the design value requirements.

[0047] When the unit is running at low load, open the coal gate on the pulverized coal pipe of the dual-purpose burner, at this time the coal combustion and burnout dual-purpose burner acts as a small pulverized coal burner, because the coal combustion and burnout dual-purpose burner is arranged 5-8 m above the pulverized coal burner, a small amount of pulverized coal is burned under the organization of the coal combustion and burnout dual-purpose burner, the center height of the furnace flame is lifted, the flue gas temperature at the furnace outlet is increased, and the main steam temperature and the reheat steam temperature at low load of the unit can meet the design value requirements; when the unit is running at high load, the main steam temperature and the reheat steam temperature can meet the design value, at this time the coal gate on the pulverized coal pipe of the dual-purpose burner is closed, the coal combustion and burnout dual-purpose burner acts as a burnout air burner, and the air staging combustion can reduce the NOx generated by combustion.

Claims

1. A combustor system suitable for deep peaking, characterized in that, The combustion system air bellow includes a coal combustion and burning-out dual-purpose burner (1), a pulverized coal burner (2) and a burning-out air burner (3); the coal combustion and burning-out dual-purpose burner (1) is located directly below the burning-out air burner (3); the coal combustion and burning-out dual-purpose burner (1) is located directly above the pulverized coal burner (2), the combustion system air bellow includes a pulverized coal burner air bellow (4) and a coal combustion and burning-out dual-purpose burner air bellow (5), the pulverized coal burner air bellow (4) is connected with the pulverized coal burner (2), the coal combustion and burning-out dual-purpose burner air bellow (5) is connected with the coal combustion and burning-out dual-purpose burner (1) and the burning-out air burner (3); the coal combustion and burning-out dual-purpose burner (1) is connected with a dual-purpose burner pulverized coal pipeline (6); The coal combustion and burning-out dual-purpose burner (1) is provided with a pulverized coal injection port (13), the pulverized coal injection port (13) is connected with the dual-purpose burner pulverized coal pipeline (6), the dual-purpose burner pulverized coal pipeline (6) is connected with a coal mill outlet pulverized coal pipeline (7), the coal mill outlet pulverized coal pipeline (7) is connected with a coal mill (12); The outer diameter of the dual-purpose burner pulverized coal pipeline (6) is 1 / 5~1 / 4 of the coal mill outlet pulverized coal pipeline (7), the dual-purpose burner pulverized coal pipeline (6) is made of Q235 steel; When applied to a tangentially fired boiler, the pulverized coal injection port (13) is arranged between the lowermost SOFA burner injection port (19) and the next lower SOFA burner injection port (19); the pulverized coal injection port (13) is provided with a first pulverized coal concentrator (14); the first pulverized coal concentrator (14) includes a concentrator shell (15), the concentrator shell (15) is provided with a partition plate (17), and the concentrator shell (15) and the partition plate (17) are provided with a concentration blade (16); The area of the pulverized coal injection port (13) is 1 / 5~1 / 4 of the area of the pulverized coal burner (2) injection port; the pulverized coal injection port (13) is provided with a swing actuator (18); When applied to a opposed firing boiler, the coal combustion and burning-out dual-purpose burner (1) is further provided with a center air injection port (21) and a burning-out air injection port (22), the pulverized coal injection port (13), the center air injection port (21) and the burning-out air injection port (22) are concentric circular structures, and from the inside to the outside, they are the pulverized coal injection port (13), the center air injection port (21) and the burning-out air injection port (22) in sequence; the pulverized coal injection port (13) is provided with a conical pulverized coal concentrator (27); the pulverized coal injection port (13) is made of heat-resistant steel, the outer diameter of the pulverized coal injection port (13) is 1 / 5~1 / 4 of the diameter of the pulverized coal burner injection port, and the end of the pulverized coal injection port (13) is provided with a ceramic tooth-shaped annular stable combustion ring (23); the center air injection port (21) is straight-flow air, the burning-out air injection port (22) is rotational flow air, and the corresponding air duct of the burning-out air injection port (22) is provided with rotational flow blades (24). When the unit is running at low load, open the coal gate on the dual-purpose burner coal pipe, at this time the coal combustion and burnout dual-purpose burner acts as a coal burner, because the coal combustion and burnout dual-purpose burner is arranged 5-8m above the coal burner, the coal is burned under the organization of the coal combustion and burnout dual-purpose burner, the center height of the furnace flame is lifted, the flue gas temperature at the outlet of the furnace is increased, and the main steam temperature and the reheat steam temperature at low load of the unit can meet the design value requirements; when the unit is running at high load, the main steam temperature and the reheat steam temperature can meet the design value, at this time the coal gate on the dual-purpose burner coal pipe is closed, the coal combustion and burnout dual-purpose burner acts as a burnout air burner, and the NOx generated by combustion can be reduced through air staging combustion.

2. A combustor system suitable for deep peaking according to claim 1, wherein, The coal combustion and burnout dual-purpose burner (1) is provided with a coal fire detection device; the coal combustion and burnout dual-purpose burner (1) is arranged 5-8m above the coal burner (2).

3. A combustor system suitable for deep peaking according to claim 1, wherein, The dual-purpose burner coal pipe (6) is sequentially provided with a coal mill side coal gate (11), an adjustable orifice (9), a wave compensator (8) and a burner side coal gate (10).

4. The combustor system suitable for deep peaking according to claim 1, wherein, An inlet elbow (20) is arranged at the inlet of the coal injection port (13).

5. A combustor system suitable for deep peaking according to claim 1, wherein, The coal combustion and burnout dual-purpose burner (1) comprises a cover plate, the cover plate is provided with a center air adjusting device (25) and a swirl vane adjusting device (26).

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