Coupling biomass power generation system for coal-fired machine

Abstract

The utility model provides a coupling biomass power generation system for a coal-fired machine. The coupling biomass power generation system comprises a coal conveying pipeline, a biomass fuel conveying loop, a boiler, a tail gas emission pipeline and a backflow pipeline. A coal mill communicated with the coal feeder is arranged on the coal conveying pipeline, so that coal briquettes conveyed from the outside are milled into coal particles, and the coal particles are input into the boiler; the biomass fuel transportation loop is used for grinding externally input biomass fuel into biomass particles and inputting the biomass particles into the boiler; a feeding hole of the boiler is respectively connected with a coal conveying pipeline and a biomass fuel conveying loop, and a discharging hole of the boiler is communicated with a chimney through a tail gas emission pipeline; and the backflow pipeline is communicated with the biomass fuel transportation loop and the tail gas emission pipeline. According to the utility model, two fuels are independently transported through the biomass fuel transportation loop and the coal transportation pipeline, are ground into particles and then are input into the boiler for mixed combustion, so that the phenomena of blockage of a primary air pulverized coal transportation pipeline, corrosion of a pulverized coal burner and the like are avoided.

Description

Technical Field

[0001] This utility model belongs to the field of coal-fired power generation technology, and in particular relates to a coupled biomass power generation system for a coal-fired engine. Background Technology

[0002] With increasing global emphasis on environmental protection and sustainable development, reducing carbon emissions has become a crucial issue in the energy sector. Coal-fired power generation coupled with biomass has emerged as a solution. This technology replaces a portion of coal combustion with biomass for power generation, effectively reducing carbon emissions. Biomass co-firing primarily employs three technical routes: direct combustion co-firing, gasification co-firing, and steam co-firing. Among these, direct combustion co-firing technology is the most widely adopted in biomass co-firing projects due to its lower initial investment and maintenance costs and higher technological maturity.

[0003] In biomass direct combustion coupled power generation technology, existing mixing methods for coal and biomass include coal mill coupling, primary air duct coupling, and burner coupling. However, coal mill coupling poses a risk of affecting the fineness of pulverized coal during the mixing and grinding of biomass and coal. Primary air duct coupling involves biomass powder and pulverized coal sharing the primary air and pulverized coal pipeline, which can easily cause mutual interference due to pressure mismatch at the mixing point of biomass powder and pulverized coal, and can also affect the primary air and pulverized coal transportation and potentially clog the pipeline. In addition, biomass fuel contains elements such as K, Na, and Cl, and burner coupling can easily cause problems such as ash accumulation, slagging, and corrosion in the pulverized coal burner. Utility Model Content

[0004] To address the problems described in the background art, where the primary air duct coupling involves biomass powder and pulverized coal sharing a primary air duct, which is prone to interference and blockage, as well as corrosion of the burner, this utility model proposes the following technical solution:

[0005] A coupled biomass power generation system for a coal-fired engine includes a coal conveying pipeline, a biomass fuel transport circuit, a boiler, a tail gas emission pipeline, and a return pipeline. The coal conveying pipeline is equipped with a coal mill connected to a coal feeder, which grinds externally supplied coal into coal particles and feeds them into the boiler. The biomass fuel transport circuit grinds externally supplied biomass fuel into biomass particles and feeds them into the boiler. The boiler's inlet is connected to both the coal conveying pipeline and the biomass fuel transport circuit, and the boiler's outlet is connected to a chimney via the tail gas emission pipeline. The return pipeline connects the biomass fuel transport circuit and the tail gas emission pipeline.

[0006] The biomass fuel transportation loop includes a crusher, a dryer, a storage silo, a feeder, and a grinder. The crusher's inlet is connected to an external material handling system, and its outlet, after passing through the dryer, is connected to the storage silo for drying the biomass fuel. The feeder's inlet is connected to the storage silo's outlet, and its outlet is connected to the grinder's inlet. The grinder's outlet is connected to the boiler.

[0007] Furthermore, the exhaust gas pipeline includes a dust removal device and a desulfurization device; the dust removal device is connected to the boiler outlet and one end of the desulfurization device, and the other end of the desulfurization device is connected to the chimney.

[0008] Furthermore, a booster fan is provided on the return pipe, one side of which is connected to the feeder and the grinder, and the other end of which is connected to the desulfurization device and the chimney.

[0009] Furthermore, the boiler is equipped with a furnace for burning different fuels, and a denitrification device is provided at the outlet end of the furnace; when the coal particles and the biomass particles enter the furnace, the coal particles and the biomass particles are mixed and burned.

[0010] Furthermore, the gas flowing in the return pipe is an inert gas.

[0011] Beneficial effects: This utility model transports two fuels separately through a biomass fuel transport circuit and a coal conveying pipeline, then grinds them into granules and feeds them into the boiler for mixed combustion, thereby avoiding phenomena such as blockage of the primary air pulverized coal conveying pipeline and corrosion of the pulverized coal burner. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a coupled biomass power generation system for a coal-fired engine according to an embodiment of the present invention. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this application clearer, the present invention will be described in further detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of the present invention.

[0014] It should be understood that the terms “center,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this patent.

[0015] Figure 1 This is a schematic diagram of a coupled biomass power generation system for a coal-fired engine according to an embodiment of the present invention.

[0016] Reference Figure 1 A coupled biomass power generation system for a coal-fired engine, according to an embodiment of this utility model, includes: a coal conveying pipeline 1, a biomass fuel transport circuit 2, a boiler 3, a tail gas emission pipeline 4, and a return pipeline 5. A coal mill connected to a coal feeder is installed on the coal conveying pipeline 1, whereby the coal transported in the pipeline is transformed from lumps into granules after passing through the coal mill. Externally transported biomass fuel, after being crushed, dried, and ground, is transported to the furnace 31 for combustion via the biomass fuel transport circuit 2. The feed inlet of the boiler 3 is connected to both the coal conveying pipeline and the biomass fuel transport circuit 2, and the discharge outlet of the boiler 3 is connected to a chimney 6 via the tail gas emission pipeline 4, thereby discharging the tail gas generated after fuel combustion through the chimney 6. The return pipe 5 connects the biomass fuel transport circuit 2 and the exhaust gas emission pipe 4. During the exhaust gas emission process, part of the exhaust gas is returned to the biomass fuel transport circuit. On the one hand, this reduces the oxygen content in the biomass fuel transport circuit 2, and on the other hand, it improves the combustion efficiency of coal and biomass fuel in the boiler 3 through the return air.

[0017] Specifically, the biomass fuel transport loop 2 includes a crusher 21, a dryer 22, a storage silo 23, a feeder 24, and a grinder 25. The biomass fuel transported by the external transport system 7 is cut and crushed by the crusher 21, transforming the dried biomass raw material into block-shaped structures meeting certain size requirements, which are then fed into the dryer for drying. After drying, the block-shaped dried biomass fuel is stored in the storage silo 23. Upon receiving a corresponding feeding command, the operator controls the storage silo 23 to discharge material to the feeder 24. The biomass fuel in the feeder 24 is then ground into granules by the grinder and fed into the boiler 3 via pipeline. Furthermore, the boiler 3 is equipped with a furnace 31 for the combustion of various fuels. The biomass fuel and coal particles are mixed and burned after being fed into the furnace 31, thereby improving the combustion efficiency of the coal.

[0018] Specifically, the exhaust gas emission pipeline 4 includes a dust removal device 41 and a desulfurization device 42. The dust removal device 41 is connected to the outlet of the boiler 3 and one end of the desulfurization device 42, while the other end of the desulfurization device 42 is connected to the chimney 6. Preferably, in this embodiment, the boiler 3 is also equipped with a denitrification device 32 for removing nitrates and an air preheater 33 for absorbing the temperature of the exhaust gas. After the exhaust gas generated from fuel combustion is denitrified by the denitrification device 32, it is cooled by the air preheater 33 and discharged through a pipeline to the dust removal device 41. After being dusted by the dust removal device 41, it enters the desulfurization device 42 to remove sulfur-containing oxides such as sulfur dioxide present in the exhaust gas, and is then discharged to the outside through the chimney 6.

[0019] Specifically, one end of the return pipe 5 is connected to the pipe between the desulfurization unit 42 and the chimney 6, and the other end of the return pipe 5 is connected to the pipe between the grinder 25 and the feeder 24. During direct combustion power generation, a portion of the inert gas in the exhaust gas treated by the desulfurization unit 42 flows back into the grinder 25 through the return pipe 5, thereby reducing the oxygen content in the grinder 25 and preventing explosions during the grinding process. Furthermore, the returned inert gas increases the gas flow rate within the furnace 31, thus improving the coal combustion efficiency. Preferably, in this embodiment, a booster fan is also provided on the return pipe 5 to increase the inert gas flow rate.

[0020] In summary, this invention transports the two fuels separately through a biomass fuel transport loop and a coal conveying pipeline, then grinds them into pellets before feeding them into the boiler for mixed combustion. This avoids problems such as clogging of the primary air and pulverized coal conveying pipeline and corrosion of the pulverized coal burner. Furthermore, the design of the return pipe reduces the oxygen content within the grinder and increases the gas flow rate within the boiler, thus preventing deflagration within the grinder and improving coal combustion efficiency.

[0021] The above description describes specific embodiments of the utility model. Other embodiments are within the scope of the appended claims.

[0022] The terms “exemplary,” “example,” etc., used throughout this specification mean “serving as an example, instance, or illustration” and do not imply “preferred” or “advantageous” than other embodiments. Detailed descriptions are included for the purpose of providing an understanding of the described techniques. However, these techniques can be practiced without these detailed descriptions. In some instances, well-known structures and apparatuses are shown in block diagram form to avoid obscuring the concepts of the described embodiments.

[0023] The optional embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present utility model are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present utility model, various simple modifications can be made to the technical solutions of the embodiments of the present utility model, and these simple modifications all fall within the protection scope of the embodiments of the present utility model.

[0024] The foregoing description of this specification is provided to enable any person skilled in the art to implement or use the content of this specification. Various modifications to the content of this specification will be apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the scope of protection of this specification. Therefore, this specification is not limited to the examples and designs described herein, but is consistent with the widest scope of the principles and novel features disclosed herein.

Claims

1. A coupled biomass power generation system for a coal-fired engine, characterized in that, The boiler includes a coal conveying pipeline (1), a biomass fuel transport circuit (2), a boiler (3), a tail gas emission pipeline (4), and a return pipeline (5). The coal conveying pipeline (1) is equipped with a coal mill connected to a coal feeder, which grinds the externally transported coal into coal particles and feeds them into the boiler (3). The biomass fuel transport circuit (2) is used to grind the externally input biomass fuel into biomass particles and feed them into the boiler (3). The feed inlet of the boiler (3) is connected to the coal conveying pipeline (1) and the biomass fuel transport circuit (2), and the discharge outlet of the boiler (3) is connected to the chimney (6) through the tail gas emission pipeline (4). The return pipeline (5) connects the biomass fuel transport circuit (2) and the tail gas emission pipeline (4).

2. The coupled biomass power generation system for a coal-fired engine according to claim 1, characterized in that, The biomass fuel transport circuit (2) includes: a crusher (21), a dryer (22), a storage bin (23), a feeder (24), and a grinder (25); the input port of the crusher (21) is connected to an external material transport system (7), and the output port of the crusher (21) is connected to the storage bin (23) after passing through the dryer (22) to dry the biomass fuel; the feed port of the feeder (24) is connected to the output port of the storage bin (23), the discharge port of the feeder (24) is connected to the feed port of the grinder (25), and the discharge port of the grinder (25) is connected to the boiler (3).

3. A coupled biomass power generation system for a coal-fired engine according to claim 2, characterized in that, The exhaust gas pipeline (4) includes a dust removal device (41) and a desulfurization device (42); the dust removal device (41) is connected to the outlet of the boiler (3) and one end of the desulfurization device (42), and the other end of the desulfurization device (42) is connected to the chimney (6).

4. A coupled biomass power generation system for a coal-fired engine according to claim 3, characterized in that, A booster fan (51) is provided on the return pipe (5). One side of the booster fan (51) is connected to the feeder (24) and the grinder (25), and the other end of the booster fan (51) is connected to the desulfurization device (42) and the chimney (6).

5. A coupled biomass power generation system for a coal-fired engine according to claim 2, characterized in that, The boiler (3) is provided with a furnace (31) for burning different fuels, and a denitrification device (32) is provided at the outlet end of the furnace (31); when the coal particles and the biomass particles enter the furnace (31), the coal particles and the biomass particles are mixed and burned.

6. A coupled biomass power generation system for a coal-fired engine according to claim 5, characterized in that, The gas flowing in the return pipe (5) is an inert gas.

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