Biomass gasified gas and pulverized coal fired boiler coupled low-load stable combustion system

Abstract

The invention discloses a biomass gasified gas and pulverized coal boiler coupled low-load stable combustion system, which can flexibly switch the supply of biomass gasified gas and fuel oil, and provide a stable heat source through the fuel oil during the shutdown period of a biomass boiler, so that the efficient utilization of clean energy can be realized, multiple guarantees are brought to the stability of low-load operation of the boiler, and the energy consumption of the boiler is reduced. And the peak regulation flexibility of the coal power unit can be further enhanced. According to the main technical scheme, a stable-combustion combustor comprises a fuel oil supply assembly, a biomass gasified gas supply assembly and an ignition assembly, a pulverized coal stable-combustion staged combustion cylinder comprises a channel, the biomass gasified gas supply assembly, the fuel oil supply assembly and the ignition assembly are partially located in the channel, the biomass gasified gas supply assembly outputs biomass gasified gas, and the fuel oil supply assembly outputs fuel oil; the fuel oil supply assembly outputs fuel oil, and the ignition assembly ignites and outputs biomass gasified gas or fuel oil in a matched mode to generate flames. Combustible materials are input into the channel so as to be combusted under the action of flames. The device is mainly used for stable combustion of pulverized coal.

Description

Technical Field

[0001] The present invention relates to the technical field of burners, and in particular, to a low-load stable combustion system coupling biomass gasification gas and a pulverized coal boiler. Background Art

[0002] Improving the flexible peak shaving ability of coal-fired power units, especially the low-load stable combustion of boilers, is particularly important. Biomass gasification gas is a gas generated during the incomplete combustion process of biomass energy in a gasifier. Its main components include fuel gases such as hydrogen, carbon monoxide, methane, and ethane. This gas is flammable and can be used in the burners of pulverized coal boilers to play a role in low-load stable combustion. However, considering that biomass boilers and coal-fired power units cannot operate synchronously continuously, it may lead to a "window period" in the supply of biomass gasification gas, affecting the stability of low-load combustion. Summary of the Invention

[0003] In view of this, to solve at least one of the above technical problems, an embodiment of the present invention provides a low-load stable combustion system coupling biomass gasification gas and a pulverized coal boiler, which can flexibly switch the supply of biomass gasification gas and fuel oil, and provide a stable heat source through fuel oil during the shutdown of the biomass boiler. It can not only achieve the efficient utilization of clean energy, bring multiple guarantees to the stability of the boiler's low-load operation, but also further enhance the peak shaving flexibility of coal-fired power units.

[0004] To achieve the above object, the present invention mainly provides the following technical solutions:

[0005] An embodiment of the present invention provides a low-load stable combustion system coupling biomass gasification gas and a pulverized coal boiler, including:

[0006] A stable combustion burner (100) and a pulverized coal stable combustion and staged combustion cylinder (200);

[0007] The stable combustion burner (100) at least includes a fuel oil supply component, a biomass gasification gas supply component, and an ignition component. The pulverized coal stable combustion and staged combustion cylinder (200) at least includes a channel. The biomass gasification gas supply component, the fuel oil supply component, and the ignition component are all partially located in the channel. The biomass gasification gas supply component is used to output biomass gasification gas, the fuel oil supply component is used to output fuel oil, and the ignition component is used for ignition to cooperate with one of the biomass gasification gas and the fuel oil to generate a flame;

[0008] The channel is used to input combustibles to burn under the action of the flame.

[0009] Among them, the fuel oil supply component includes an oil gun (1), an oil gun sleeve (2), and an oil gun combustion-supporting air swirl vane (9). The biomass gasification gas supply component includes a biomass gasification gas pipe (7), a combustion-supporting air pipe (8), and a biomass gasification gas combustion-supporting air swirl vane (11);

[0010] The oil gun (1) is disposed through the oil gun sleeve (2). The output ends of both the oil gun (1) and the oil gun sleeve (2) are located in the passage of the pulverized coal stable combustion and staged combustion cylinder (200). The output end of the oil gun (1) protrudes from the output end of the oil gun sleeve (2). The input ends of both the oil gun (1) and the oil gun sleeve (2) are located outside the pulverized coal stable combustion and staged combustion cylinder (200). The oil gun combustion-supporting air swirl vane (9) is disposed between the oil gun sleeve (2) and the oil gun (1) and is disposed adjacent to the output end of the oil gun sleeve (2).

[0011] The oil gun sleeve (2) is disposed through the biomass gasification gas pipe (7). The output end of the biomass gasification gas pipe (7) is located in the passage of the pulverized coal stable combustion and staged combustion cylinder (200). The output end of the oil gun sleeve (2) is located inside the biomass gasification gas pipe (7). The input end of the biomass gasification gas pipe (7) is located outside the pulverized coal stable combustion and staged combustion cylinder (200).

[0012] The combustion-supporting air pipe (8) is sleeved outside the biomass gasification gas pipe (7), and the output end of the combustion-supporting air pipe (8) is flush with the output end of the biomass gasification gas pipe (7). The input end of the combustion-supporting air pipe (8) is located outside the pulverized coal stable combustion and staged combustion cylinder (200).

[0013] The biomass gasification gas combustion-supporting air swirl vane (11) is disposed between the combustion-supporting air pipe (8) and the biomass gasification gas pipe (7) and is disposed adjacent to the output end of the biomass gasification gas pipe (7).

[0014] The ignition assembly is connected through the biomass gasification gas pipe (7), and in the axial direction of the biomass gasification gas pipe (7), the output end of the ignition assembly is located between the output end of the oil gun (1) and the output end of the biomass gasification gas pipe (7).

[0015] Wherein, the ignition assembly includes an ignition gun (5) and an ignition gun support (6). The ignition gun support (6) is connected to the biomass gasification gas pipe (7). The ignition gun (5) is connected through the ignition gun support (6), and the output end of the ignition gun (5) is located between the output end of the oil gun (1) and the output end of the biomass gasification gas pipe (7).

[0016] Wherein, the fuel supply assembly further includes a stable combustion cover (10). The stable combustion cover (10) is disposed inside the biomass gasification gas pipe (7) and is disposed adjacent to the output end of the biomass gasification gas pipe (7).

[0017] The stable combustion hood (10) includes a central opening, an input end face and an output end face arranged back to back. The output end face faces the output end of the biomass gasification gas pipe (7). In the direction away from the central opening, the output end face is inclined towards the output end of the biomass gasification gas pipe (7). The stable combustion hood (10) further includes a plurality of output holes that penetrate the input end face and the output end face. The output end of the oil gun sleeve (2) is connected to the edge of the central opening of the stable combustion hood (10).

[0018] Among them, the fuel supply assembly further includes a flame detector (3) and a flame detector cooling air sleeve (4). The flame detector (3) is inserted through the flame detector cooling air sleeve (4), and the flame detector cooling air sleeve (4) is inserted through the biomass gasification gas pipe (7). In the axial direction of the biomass gasification gas pipe (7), the detection end of the flame detector (3) is located between the output end of the oil gun (1) and the output end of the biomass gasification gas pipe (7).

[0019] Among them, the biomass gasification gas pipe (7) includes a front baffle away from the output end of the biomass gasification gas pipe (7). A plurality of mounting holes are formed in the front baffle. The flame detector cooling air sleeve (4), the oil gun sleeve (2) and the ignition assembly are respectively inserted through the biomass gasification gas pipe (7) through different mounting holes.

[0020] Among them, the pulverized coal stable combustion and staged combustion cylinder (200) includes an elbow (12), an outer combustion cylinder (21) and a plurality of inner combustion cylinders. The passage includes a front passage and a rear passage. The elbow (12) includes a combustible inlet, a first communication opening and a front passage connecting the combustible inlet and the first communication opening. The front passage is bent. The biomass gasification gas supply assembly, the fuel supply assembly and the ignition assembly are all inserted into the elbow (12) along the direction of the first communication opening of the elbow (12);

[0021] The outer combustion cylinder (21) includes a flame outlet, a second communication opening and a rear passage connecting the flame outlet and the second communication opening. One end of the elbow (12) from the first communication opening is connected to one end of the second communication opening of the outer combustion cylinder (21), and the front passage is communicated with the rear passage. The combustible inlet is used for inputting combustibles. During the movement of the combustibles towards the rear passage, they burn under the action of the flame generated by the stable combustion burner (100) in the rear passage;

[0022] A plurality of inner combustion cylinders are located inside the outer combustion cylinder (21), and the plurality of inner combustion cylinders are arranged at intervals in the direction away from the stable combustion burner (100). There is a gap between the inner combustion cylinders and the outer combustion cylinder (21).

[0023] Among them, the pulverized coal stable combustion and staged combustion cylinder (200) further includes a lean pulverized coal concentration block (13). The lean pulverized coal concentration block (13) is located inside the outer combustion cylinder (21) and is arranged adjacent to the second communication opening.

[0024] Among them, the multiple internal combustion cylinders include a primary internal combustion cylinder (14) and a secondary internal combustion cylinder (16), and the pulverized coal stable combustion staged combustion cylinder (200) further includes a primary combustion cylinder support (15) and a secondary combustion cylinder support (17);

[0025] The primary internal combustion cylinder (14) and the secondary internal combustion cylinder (16) are arranged at intervals in the direction away from the stable combustion burner (100). The primary internal combustion cylinder (14) is connected to the outer combustion cylinder (21) through the primary combustion cylinder support (15), and the secondary internal combustion cylinder (16) is connected to the outer combustion cylinder (21) through the secondary combustion cylinder support (16). The gap between the secondary internal combustion cylinder (16) and the outer combustion cylinder (21) is smaller than the gap between the primary internal combustion cylinder (14) and the outer combustion cylinder (21).

[0026] Among them, the pulverized coal stable combustion staged combustion cylinder (200) further includes a perimeter air nozzle (18) and a perimeter air nozzle support (19). The perimeter air nozzle (18) is connected to the outer periphery of the outer combustion cylinder (21) through the perimeter air nozzle support (19) and is adjacent to one end of the outer combustion cylinder (21) far from the elbow (12);

[0027] The pulverized coal stable combustion staged combustion cylinder (200) further includes a stable combustion tooth (20). The stable combustion tooth (20) is located inside the outer combustion cylinder (21) and is adjacent to one end of the outer combustion cylinder (21) far from the elbow (12).

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] (1) By combining the combustible gas generated by the pyrolysis of the biomass boiler with the burner of the power station pulverized coal boiler, the present invention can continuously and stably supply the combustible gas to the burner of the pulverized coal boiler during the operation of the biomass boiler. On the one hand, it realizes the efficient utilization of clean energy, and on the other hand, it can improve the operation stability of the pulverized coal boiler. Especially during the low-load stable combustion period, the continuous biomass gasification gas flame enables the pulverized coal to be continuously heated by an external heat source, greatly reducing the risk of "flameout" of the burner and enhancing the peak shaving flexibility of the unit.

[0030] (2) The stable combustion burner of the present invention includes a fuel supply component and a biomass gasification gas supply component. During the low-load stable combustion period, if the biomass boiler is not in operation, the stable combustion state of the burner can be continued through the oil flame. The establishment of a micro-oil ignition combustion system coupled with biomass gasification gas can provide double guarantees for the low-load stable combustion of the unit, greatly enhancing the stability of the deep peak shaving of the coal-fired power unit.

[0031] (3) In the present invention, a pulverized coal stable combustion and staged combustion cylinder is connected after the stable combustion burner, enabling staged combustion of the primary air pulverized coal, effectively avoiding the problems of incomplete combustion and unstable combustion. After the pulverized coal is ignited and stably burned by the flame of the stable combustion burner, the operation of the stable combustion burner can be stopped, or the stable combustion burner can be continuously operated during the low-load stable combustion stage to ensure the stability of low-load combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 FIG. is a schematic structural diagram of a low-load stable combustion system coupling biomass gasification gas and a pulverized coal boiler provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific embodiments, structures, features, and effects of the low-load stable combustion system coupling biomass gasification gas and a pulverized coal boiler according to the present invention as follows.

[0034] As Figure 1 shown, an embodiment of the present invention provides a low-load stable combustion system coupling biomass gasification gas and a pulverized coal boiler, including:

[0035] a stable combustion burner (100) and a pulverized coal stable combustion and staged combustion cylinder (200);

[0036] The stable combustion burner (100) at least includes a fuel supply component, a biomass gasification gas supply component, and an ignition component. The pulverized coal stable combustion and staged combustion cylinder (200) at least includes a channel. The biomass gasification gas supply component, the fuel supply component, and the ignition component are all partially located in the channel. The biomass gasification gas supply component is used to output biomass gasification gas, the fuel supply component is used to output fuel, and the ignition component is used for ignition to cooperate with one of the biomass gasification gas and fuel to generate a flame;

[0037] The channel is used to input combustibles to burn under the action of the flame.

[0038] Among them, the fuel supply component and the biomass gasification gas supply component can be used independently and selectively of each other, and then a stable biomass gasification gas flame or oil flame can be generated according to the working conditions. The fact that the biomass gasification gas supply component, the fuel supply component, and the ignition component are all partially located in the channel means that the output end of the biomass gasification gas supply component for outputting biomass gasification gas, the output end of the fuel supply component for outputting fuel, and the output end of the ignition component for providing a fire point are all located in the channel.

[0039] In use, according to the working conditions, the biomass gasification gas supply component or the fuel supply component is used to supply biomass gasification gas or fuel to the passage, and then the ignition component provides a fire point to ignite the biomass gasification gas or fuel input into the passage. The pulverized coal enters the passage and will be ignited by the combustion of the biomass gasification gas flame or the oil flame. In some embodiments, the pulverized coal stable combustion and staged combustion cylinder (200) is used to make the primary air pulverized coal burn in stages, further enhancing the stability of the burner flame, which will be described in combination with more specific embodiments later.

[0040] The detailed description of the ignition process will be given in combination with more specific embodiments later. In addition, the biomass gasification gas and the fuel shall not be put into operation simultaneously.

[0041] An embodiment of the present invention provides a low-load stable combustion system coupling a biomass gasification gas and a pulverized coal boiler, which can achieve long-term oil-free stable combustion by supplying the gasified gas generated by the biomass boiler to the pulverized coal boiler burner at low load, or can continue to achieve low-load stable combustion of the boiler by injecting oil during the shutdown of the biomass boiler. This system provides double guarantees for the low-load stable operation of the power station pulverized coal boiler, greatly improving the flexibility of the unit's deep peak shaving.

[0042] For the convenience of description below, Figure 1 the extending direction of the axis of the oil gun (1) is referred to as the axial direction. Hereinafter, the input end may specifically be an input port, and the output end may specifically be an output port.

[0043] In one embodiment, the fuel supply component includes an oil gun (1), an oil gun sleeve (2), and an oil gun combustion-supporting air swirl vane (9), and the biomass gasification gas supply component includes a biomass gasification gas pipe (7), a combustion-supporting air pipe (8), and a biomass gasification gas combustion-supporting air swirl vane (11). The oil gun (1) and the oil gun sleeve (2) are both approximately cylindrical or rod-shaped structures, and the oil gun (1) and the oil gun sleeve (2) respectively include an input end and an output end. The input end of the oil gun (1) refers to the end for inputting fuel, and the output end of the oil gun (1) refers to the end for discharging fuel during use. The input end and the output end of the oil gun sleeve (2) are respectively used for inputting and outputting the oil gun combustion-supporting air. The input end of the oil gun sleeve (2) can be adjacent to, for example Figure 1It is provided at the starting end on the leftmost side of the middle oil gun sleeve (2) and is perpendicular to the axial direction. The oil gun (1) axially penetrates inside the oil gun sleeve (2). The output ends of both the oil gun (1) and the oil gun sleeve (2) are located in the passage of the pulverized coal stable combustion and staged combustion cylinder (200), and the output end of the oil gun (1) protrudes from the output end of the oil gun sleeve (2). The connection between the oil gun (1) and the oil gun sleeve (2) is detachable. The input ends of both the oil gun (1) and the oil gun sleeve (2) are located outside the pulverized coal stable combustion and staged combustion cylinder (200). The oil gun combustion-supporting air swirl vane (9) is arranged between the oil gun sleeve (2) and the oil gun (1) and is provided adjacent to the output end of the oil gun sleeve (2), or adjacent to, for example Figure 1 It is provided at the tail end on the rightmost side of the middle oil gun sleeve (2). The output end of the oil gun sleeve (2) is flush with the output end of the oil gun combustion-supporting air swirl vane (9). When the oil gun combustion-supporting air swirl vane (9) operates, the oil gun combustion-supporting air flows inside the oil gun sleeve (2).

[0044] The oil gun sleeve (2) axially penetrates the biomass gasification gas pipe (7), and the installation of the oil gun sleeve (2) and the biomass gasification gas pipe (7) is detachable. The biomass gasification gas pipe (7) includes an input end and an output end, and the input end and the output end of the biomass gasification gas pipe (7) are respectively used for inputting and outputting biomass gasification gas. The input end of the biomass gasification gas pipe (7) is adjacent to the front end on the leftmost side of the biomass gasification gas pipe (7) as shown in Figure 1 The input end of the biomass gasification gas pipe (7) can be arranged perpendicular to the axial direction. The output end of the biomass gasification gas pipe (7) is located in the passage of the pulverized coal stable combustion and staged combustion cylinder (200), the output end of the oil gun sleeve (2) is located inside the biomass gasification gas pipe (7), and the input end of the biomass gasification gas pipe (7) is located outside the pulverized coal stable combustion and staged combustion cylinder (200).

[0045] The combustion-supporting air pipe (8) is sleeved outside the biomass gasification gas pipe (7), and the combustion-supporting air pipe (8) and the biomass gasification gas pipe (7) can be fixedly connected by a flange. The combustion-supporting air pipe (8) includes an input end and an output end, and the input end and the output end of the combustion-supporting air pipe (8) are respectively used for inputting and outputting combustion-supporting hot air. The input end of the combustion-supporting air pipe (8) is adjacent to the front end on the leftmost side of the combustion-supporting air pipe (8) as shown in Figure 1 The input end of the combustion-supporting air pipe (8) can be arranged perpendicular to the axial direction. The output end of the combustion-supporting air pipe (8) is flush with the output end of the biomass gasification gas pipe (7). The input end of the combustion-supporting air pipe (8) is located outside the pulverized coal stable combustion and staged combustion cylinder (200), and the input end of the biomass gasification gas pipe (7) is located outside the combustion-supporting air pipe (8).

[0046] The swirl vane (11) of the combustion-supporting air for the biomass gasification gas is arranged between the combustion-supporting air pipe (8) and the biomass gasification gas pipe (7), and is arranged adjacent to the output end of the biomass gasification gas pipe (7), that is, the output ends of the swirl vane (11) of the combustion-supporting air for the biomass gasification gas, the combustion-supporting air pipe (8) and the biomass gasification gas pipe (7) are flush.

[0047] The ignition assembly is inserted through the biomass gasification gas pipe (7), and in the axial direction of the biomass gasification gas pipe (7), the output end of the ignition assembly is located between the output end of the oil gun (1) and the output end of the biomass gasification gas pipe (7). The ignition assembly is used to provide a fire point for the output fuel or biomass gasification gas. In a more specific embodiment, the ignition assembly includes an ignition gun (5) and an ignition gun bracket (6). The ignition gun bracket (6) is connected to the biomass gasification gas pipe (7), for example, it can be connected to the starting end at the leftmost side of the biomass gasification gas pipe (7). The ignition gun (5) is inserted through the ignition gun bracket (6). The ignition gun (5) includes an output end that can generate a fire point. The output end of the ignition gun (5) is located between the output end of the oil gun (1) and the output end of the biomass gasification gas pipe (7), and then the ignition of the fuel or biomass gasification gas can be realized.

[0048] In one embodiment, the fuel supply assembly further includes a flame stabilizer (10). The outer diameter of the flame stabilizer (10) is the same as the inner diameter of the biomass gasification gas pipe (7). The flame stabilizer (10) is arranged inside the biomass gasification gas pipe (7), and then the outer peripheral surface of the flame stabilizer (10) is connected to the inner wall surface of the biomass gasification gas pipe (7). The flame stabilizer (10) is arranged adjacent to the output end of the biomass gasification gas pipe (7), that is, the output end of the flame stabilizer (10) is fixedly installed flush with the output end of the biomass gasification gas pipe (7). The flame stabilizer (10) includes a central opening and an input end face and an output end face arranged opposite to each other. The output end face faces the output end of the biomass gasification gas pipe (7). In the direction away from the central opening, the output end face is inclined towards the direction close to the output end of the biomass gasification gas pipe (7), and then the output end face is inclined, such as a conical surface. The flame stabilizer (10) further includes a plurality of output holes. The output holes penetrate through the input end face and the output end face. The air outlet direction of the output holes converges obliquely towards the axis, and then the biomass gasification towards the center can be realized. The output end of the oil gun sleeve (2) is connected to the edge of the central opening of the flame stabilizer (10). The cross-sectional diameter of the output end of the oil gun sleeve (2), that is, the outer diameter of the oil gun sleeve (2), is the same as the inner diameter of the central opening of the flame stabilizer (10). Then the edge of the output end of the oil gun sleeve (2) is continuously and fittingly connected to the edge of the central opening of the flame stabilizer (10), so that all the biomass gasification gas entering the biomass gasification gas pipe (7) is output through the flame stabilizer (10). In the embodiment including the flame stabilizer (10), the output end of the aforementioned ignition gun (5) can extend to the output end face of the flame stabilizer (10).

[0049] In one embodiment, the fuel supply assembly further includes a flame detector (3) and a flame detector cooling air sleeve (4). The flame detector (3) is used to detect whether the fuel or the biomass gasification gas is successfully ignited. The flame detector (3) is inserted through the flame detector cooling air sleeve (4). The flame detector cooling air sleeve (4) includes an input end and an output end. The input end and the output end of the flame detector cooling air sleeve (4) are respectively used for inputting and outputting cooling air. The input end of the flame detector cooling air sleeve (4) is located outside the biomass gasification pipe (7) and is adjacent to the front end of the leftmost side of the flame detector cooling air sleeve (4) as shown in Figure 1 . The input end of the flame detector cooling air sleeve (4) can be arranged perpendicular to the axial direction. The flame detector cooling air sleeve (4) is inserted through the biomass gasification pipe (7). In the axial direction of the biomass gasification pipe (7), the detection end of the flame detector (3) is located between the output end of the oil gun (1) and the output end of the biomass gasification pipe (7). In the embodiment including the stable combustion cover (10), the output end of the flame detector cooling air sleeve (4) can extend to the output end face of the stable combustion cover (10). The combination of the flame detector (3) and the flame detector cooling air sleeve (4) can be respectively arranged on two sides of the oil gun sleeve (2) that are radially opposite to each other with respect to the foregoing ignition assembly.

[0050] In one embodiment, the biomass gasification pipe (7) includes a front baffle away from the output end of the biomass gasification pipe (7), that is, the vertical plate located on the leftmost side of the biomass gasification pipe (7) as shown in Figure 1 . A plurality of mounting holes are formed in the front baffle. For example, there can be three mounting holes. The three mounting holes are all circular holes and are vertically and spaced apart along the radial direction. The flame detector cooling air sleeve (4), the oil gun sleeve (2), and the ignition gun bracket (6) of the ignition assembly are respectively mounted on the biomass gasification pipe (7) through the three mounting holes.

[0051] The working process of the stable combustion burner (100) in one embodiment is described once below. It can be understood that in some other embodiments, the following working process of the stable combustion burner (100) can also be split. For example, the working process of the stable combustion burner (100) is only part of the process described below. The startup of the stable combustion burner (100) is divided into two working conditions. In the first working condition, only the biomass gasification gas supply component is put into operation. The input end of the combustion air duct (8) admits combustion hot air. After passing through the biomass gasification gas combustion air swirl vanes (11), the combustion hot air enters the passage of the pulverized coal stable combustion and staging combustion cylinder (200). Subsequently, the input end of the biomass gasification gas pipe (7) inputs the biomass gasification gas generated by the biomass boiler. After passing through the annular stable combustion hood (10) with a high periphery and a low center, it outputs forward and converges towards the center, and then enters the passage of the pulverized coal stable combustion and staging combustion cylinder (200). Subsequently, the ignition gun (5) is started. The ignition gun (5) operates for a preset time, such as ten seconds, and then the status of the flame detector (3) is observed. If the flame detector (3) shows fire, the operation of the ignition gun (5) is stopped. If the flame detector (3) does not show fire, the ignition is stopped. After adjusting the parameters, the ignition is carried out again. After successful ignition, the stable combustion burner (100) can be continuously put into operation. In the second working condition, when the biomass boiler stops running, the working medium transportation in the biomass gasification gas pipe (7) and the combustion air duct (8) is shut off. The oil gun combustion air swirl vanes (9) are opened to provide combustion air for the oil gun (1). The oil gun combustion air enters the passage of the pulverized coal stable combustion and staging combustion cylinder (200) after passing through the input end of the oil gun sleeve (2) and the oil gun combustion air swirl vanes (9). Subsequently, the oil gun (1) is opened to supply fuel oil. After the fuel oil is ejected, the ignition gun (5) is started. The ignition gun (5) operates for a preset time, such as ten seconds, and then the status of the flame detector (3) is observed. If the flame detector (3) shows fire, the operation of the ignition gun (5) is stopped. If the flame detector (3) does not show fire, the ignition is stopped. After adjusting the parameters, the ignition is carried out again.

[0052] In one embodiment, the pulverized coal stable combustion and staging combustion cylinder (200) includes an elbow (12), an outer combustion cylinder (21), and a plurality of inner combustion cylinders. The passage of the pulverized coal stable combustion and staging combustion cylinder (200) further includes a front passage and a rear passage. The elbow (12) includes a combustible inlet, a first communication opening, and a front passage connecting the combustible inlet and the first communication opening. The front passage is bent. The biomass gasification gas supply component, the fuel supply component, and the ignition component all extend into the elbow (12) in the direction of the first communication opening of the elbow (12). The direction of the first communication opening is the axial direction. The output ends of the biomass gasification gas supply component, the fuel supply component, and the ignition component are all located in the front passage and are arranged at positions adjacent to the rear passage. It can be understood that they do not enter the rear passage. The combustion air duct (8) of the biomass gasification gas supply component and the elbow (12) can be connected by a flange.

[0053] The outer combustion cylinder (21) includes a flame outlet, a second communication opening, and a rear channel connecting the flame outlet and the second communication opening. The rear channel is a straight bar-shaped channel extending axially. The elbow (12) is connected to one end of the second communication opening of the outer combustion cylinder (21) from one end of the first communication opening, and the front channel communicates with the rear channel. The combustible inlet is used to input combustibles. When the combustibles move backward in the rear channel, they burn under the action of the flame generated by the stable combustion burner (100) in the rear channel. A plurality of inner combustion cylinders are located inside the outer combustion cylinder (21), and the plurality of inner combustion cylinders are arranged at intervals in the direction away from the stable combustion burner (100). There is a gap between the inner combustion cylinder and the outer combustion cylinder (21). The combustibles can be pulverized coal. Part of the pulverized coal can pass through the inner combustion cylinder, and the other part can pass through the gap between the inner combustion cylinder and the outer combustion cylinder (21), thereby realizing staged combustion of the pulverized coal.

[0054] In a more specific embodiment, the plurality of inner combustion cylinders include a primary inner combustion cylinder (14) and a secondary inner combustion cylinder (16). The pulverized coal stable combustion and staged combustion cylinder (200) further includes a primary combustion cylinder support (15) and a secondary combustion cylinder support (17). The primary inner combustion cylinder (14) and the secondary inner combustion cylinder (16) are arranged at intervals in the direction away from the stable combustion burner (100). The primary inner combustion cylinder (14) is connected to the outer combustion cylinder (21) through the primary combustion cylinder support (15). The structure of the primary combustion cylinder support (15) can be various, as long as it takes into account support and reduces the blockage of the flow of combustibles in the gap. For example, the primary combustion cylinder support (15) can be fixedly installed in a "cross" shape around the primary inner combustion cylinder (14); the secondary inner combustion cylinder (16) is connected to the outer combustion cylinder (21) through the secondary combustion cylinder support (16). For example, the secondary combustion cylinder support (16) can be fixedly installed in a "cross" shape around the secondary combustion cylinder (16). The gap between the secondary inner combustion cylinder (16) and the outer combustion cylinder (21) is smaller than the gap between the primary inner combustion cylinder (14) and the outer combustion cylinder (21), so that part of the combustibles can enter the secondary inner combustion cylinder (16), rather than all directly moving out through the gap outside the secondary inner combustion cylinder (16).

[0055] In one embodiment, the pulverized coal stable combustion and staged combustion cylinder (200) further includes a lean pulverized coal concentration block (13). There can be a plurality of lean pulverized coal concentration blocks (13), which are circumferentially arranged on the inner wall of the outer combustion cylinder (21), and the lean pulverized coal concentration block (13) is arranged adjacent to the second communication opening, or is arranged between the primary inner combustion cylinder (14) and the elbow (12). The lean pulverized coal concentration block (13) is used to concentrate the pulverized coal.

[0056] In one embodiment, the pulverized coal stable combustion graded combustion tube (200) further includes a peripheral air nozzle (18) and a peripheral air nozzle bracket (19), wherein the peripheral air nozzle (18) is connected to the outer periphery of the outer combustion tube (21) through the peripheral air nozzle bracket (19), and the output end of the peripheral air nozzle (18) is flush with the output end of the outer combustion tube (21) or the flame outlet, and the distance between the peripheral air nozzle (18) and the outer combustion tube (21) decreases in the direction toward the flame outlet, thereby achieving airflow convergence. The pulverized coal stable combustion graded combustion tube (200) further includes a stabilizing tooth (20), which is located in the outer combustion tube (21), such as being evenly distributed along the circumference on the inner wall of the outer combustion tube (21), and the output end of the stabilizing tooth (20) is flush with the output end of the outer combustion tube (21) or the flame outlet.

[0057] The following is a one-time description of the working process of the pulverized coal stable combustion staged combustion cylinder (200) in one embodiment. It can be understood that in some other embodiments, the working process of the pulverized coal stable combustion staged combustion cylinder (200) can also be split, such as the working process of the pulverized coal stable combustion staged combustion cylinder (200) is only a part of the process described below.

[0058] After the biomass flame or oil flame generated by the stable combustion burner (100) burns stably, primary air pulverized coal is introduced through the combustible material inlet of the elbow (12). After the pulverized coal passes through the front channel of the elbow (12), it enters the rear channel of the outer combustion tube (21). Thereafter, the pulverized coal is concentrated by the pulverized coal concentration block (13) and converges toward the center of the outer combustion tube (21). Part of the pulverized coal enters the first-level inner combustion tube (14) and is ignited by the flame of the stable combustion burner (100). The remaining pulverized coal passes through the gap between the first-level inner combustion tube (14) and the outer combustion tube (21). Thereafter, part of the pulverized coal enters the second-level inner combustion tube (16) and is ignited. A small amount of the pulverized coal enters the gap between the second-level inner combustion tube (16) and the outer combustion tube (21) and is ignited by the central flame formed by the ignited pulverized coal, thereby realizing multi-stage combustion. The multi-stage combustion effectively realizes the complete combustion of the pulverized coal and further enhances the combustion stability. The flame passes through the flame stabilizing teeth (20) and enters the furnace through the flame outlet of the outer combustion tube (21), and the peripheral wind enters the furnace through the peripheral wind nozzle (18), which effectively strengthens the flame rigidity.

[0059] In addition, the elbow (12) is internally affixed with wear-resistant ceramics. The first-stage inner combustion tube (14), the second-stage inner combustion tube (16) and the outer combustion tube (21) are all made of high-temperature wear-resistant metal materials. The combustion-supporting air duct (8) is externally affixed with wear-resistant ceramics.

[0060] The above are only the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A low-load stable combustion system coupling biomass gasification gas with a pulverized coal boiler, characterized in that Comprising: A stable combustion burner (100) and a pulverized coal stable combustion and staged combustion cylinder (200); The stable combustion burner (100) at least comprises a fuel supply assembly, a biomass gasification gas supply assembly and an ignition assembly. The pulverized coal stable combustion and staged combustion cylinder (200) at least comprises a channel. The biomass gasification gas supply assembly, the fuel supply assembly and the ignition assembly are all partially located in the channel. The biomass gasification gas supply assembly is used for outputting biomass gasification gas, the fuel supply assembly is used for outputting fuel, and the ignition assembly is used for ignition to generate a flame in cooperation with one of the biomass gasification gas and the fuel; The channel is used for inputting combustibles to burn under the action of the flame.

2. The low-load stable combustion system coupling biomass gasification gas and a pulverized coal boiler according to claim 1, wherein The fuel supply assembly comprises an oil gun (1), an oil gun sleeve (2) and an oil gun combustion-supporting air swirl vane (9). The biomass gasification gas supply assembly comprises a biomass gasification gas pipe (7), a combustion-supporting air pipe (8) and a biomass gasification gas combustion-supporting air swirl vane (11); The oil gun (1) is disposed through the oil gun sleeve (2). The output ends of the oil gun (1) and the oil gun sleeve (2) are both located in the channel. The output end of the oil gun (1) protrudes from the output end of the oil gun sleeve (2). The input ends of the oil gun (1) and the oil gun sleeve (2) are both located outside the pulverized coal stable combustion and staged combustion cylinder (200). The oil gun combustion-supporting air swirl vane (9) is disposed between the oil gun sleeve (2) and the oil gun (1) and is disposed adjacent to the output end of the oil gun sleeve (2); The oil gun sleeve (2) is disposed through the biomass gasification gas pipe (7). The output end of the biomass gasification gas pipe (7) is located in the channel. The output end of the oil gun sleeve (2) is located inside the biomass gasification gas pipe (7). The input end of the biomass gasification gas pipe (7) is located outside the pulverized coal stable combustion and staged combustion cylinder (200); The combustion-supporting air pipe (8) is sleeved outside the biomass gasification gas pipe (7), and the output end of the combustion-supporting air pipe (8) is flush with the output end of the biomass gasification gas pipe (7). The input end of the combustion-supporting air pipe (8) is located outside the pulverized coal stable combustion and staged combustion cylinder (200); The biomass gasification gas combustion-supporting air swirl vane (11) is disposed between the combustion-supporting air pipe (8) and the biomass gasification gas pipe (7) and is disposed adjacent to the output end of the biomass gasification gas pipe (7); The ignition assembly is connected through the biomass gasification gas pipe (7), and in the axial direction of the biomass gasification gas pipe (7), the output end of the ignition assembly is located between the output end of the oil gun (1) and the output end of the biomass gasification gas pipe (7).

3. The low-load stable combustion system coupling biomass gasification gas and a pulverized coal boiler according to claim 2, wherein The ignition assembly includes an ignition gun (5) and an ignition gun bracket (6). The ignition gun bracket (6) is connected to the biomass gasification gas pipe (7). The ignition gun (5) is inserted through the ignition gun bracket (6), and the output end of the ignition gun (5) is located between the output end of the oil gun (1) and the output end of the biomass gasification gas pipe (7).

4. The low-load stable combustion system for coupling biomass gasification gas and pulverized coal boiler according to claim 2, wherein The fuel supply assembly further includes a stable combustion cover (10). The stable combustion cover (10) is arranged inside the biomass gasification gas pipe (7) and is arranged adjacent to the output end of the biomass gasification gas pipe (7). The stable combustion cover (10) includes a central opening, an input end face and an output end face arranged opposite to each other. The output end face faces the output end of the biomass gasification gas pipe (7). In the direction away from the central opening, the output end face is inclined towards the direction close to the output end of the biomass gasification gas pipe (7). The stable combustion cover (10) further includes a plurality of output holes. The output holes penetrate through the input end face and the output end face. The output end of the oil gun sleeve (2) is connected to the edge of the central opening of the stable combustion cover (10).

5. The low-load stable combustion system for coupling biomass gasification gas and pulverized coal boiler according to claim 2, wherein The fuel supply assembly further includes a flame detector (3) and a flame detector cooling air sleeve (4). The flame detector (3) is inserted through the flame detector cooling air sleeve (4). The flame detector cooling air sleeve (4) is inserted through the biomass gasification gas pipe (7). In the axial direction of the biomass gasification gas pipe (7), the detection end of the flame detector (3) is located between the output end of the oil gun (1) and the output end of the biomass gasification gas pipe (7).

6. The low-load stable combustion system for coupling biomass gasification gas and pulverized coal boiler according to claim 5, wherein The biomass gasification gas pipe (7) includes a front baffle away from the output end of the biomass gasification gas pipe (7). A plurality of mounting holes are formed in the front baffle. The flame detector cooling air sleeve (4), the oil gun sleeve (2) and the ignition assembly are respectively inserted through the biomass gasification gas pipe (7) through different mounting holes.

7. The low-load stable combustion system for coupling biomass gasification gas and pulverized coal boiler according to claim 1, wherein The pulverized coal stable combustion and staged combustion cylinder (200) includes an elbow (12), an outer combustion cylinder (21) and a plurality of inner combustion cylinders. The passage includes a front passage and a rear passage. The elbow (12) includes a combustible inlet, a first communication opening and the front passage connecting the combustible inlet and the first communication opening. The front passage is bent. The biomass gasification gas supply assembly, the fuel supply assembly and the ignition assembly are all inserted into the elbow (12) along the direction of the first communication opening of the elbow (12). The outer combustion cylinder (21) includes a flame outlet, a second communication opening, and a rear channel connecting the flame outlet and the second communication opening. One end of the elbow (12) is connected to one end of the second communication opening of the outer combustion cylinder (21) through the first communication opening, and the front channel communicates with the rear channel. The combustible inlet is used to input the combustible. During the movement of the combustible towards the rear channel, it burns under the action of the flame generated by the stable combustion burner (100) in the rear channel. A plurality of the inner combustion cylinders are located inside the outer combustion cylinder (21), and the plurality of inner combustion cylinders are arranged at intervals in the direction away from the stable combustion burner (100). There is a gap between the inner combustion cylinder and the outer combustion cylinder (21).

8. The low-load stable combustion system for coupling biomass gasification gas and pulverized coal boiler according to claim 1, wherein The pulverized coal stable combustion and staged combustion cylinder (200) further includes a lean pulverized coal concentration block (13). The lean pulverized coal concentration block (13) is located inside the outer combustion cylinder (21), and the lean pulverized coal concentration block (13) is arranged adjacent to the second communication opening.

9. The low-load stable combustion system for coupling biomass gasification gas and pulverized coal boiler according to claim 8, wherein The plurality of inner combustion cylinders include a primary inner combustion cylinder (14) and a secondary inner combustion cylinder (16). The pulverized coal stable combustion and staged combustion cylinder (200) further includes a primary combustion cylinder support (15) and a secondary combustion cylinder support (17); The primary inner combustion cylinder (14) and the secondary inner combustion cylinder (16) are arranged at intervals in the direction away from the stable combustion burner (100). The primary inner combustion cylinder (14) is connected to the outer combustion cylinder (21) through the primary combustion cylinder support (15), and the secondary inner combustion cylinder (16) is connected to the outer combustion cylinder (21) through the secondary combustion cylinder support (16). The gap between the secondary inner combustion cylinder (16) and the outer combustion cylinder (21) is smaller than the gap between the primary inner combustion cylinder (14) and the outer combustion cylinder (21).

10. The low-load stable combustion system for coupling biomass gasification gas and pulverized coal boiler according to claim 1, wherein The pulverized coal stable combustion and staged combustion cylinder (200) further includes a perimeter air nozzle (18) and a perimeter air nozzle support (19). The perimeter air nozzle (18) is connected to the outer periphery of the outer combustion cylinder (21) through the perimeter air nozzle support (19), and is arranged adjacent to one end of the outer combustion cylinder (21) away from the elbow (12); The pulverized coal stable combustion and staged combustion cylinder (200) further includes a stable combustion tooth (20). The stable combustion tooth (20) is located inside the outer combustion cylinder (21), and is arranged adjacent to one end of the outer combustion cylinder (21) away from the elbow (12).

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