Composite boiler system integrating biomass direct combustion and parallel coupling blending combustion

Abstract

The utility model discloses a composite boiler system integrating biomass direct combustion and parallel coupling blending combustion. The composite boiler system comprises a steam turbine; the first boiler system comprises a first stock bin, a first processing assembly and a first boiler, the first stock bin is used for storing biomass, and the first processing assembly is connected between the first stock bin and the first boiler; the second boiler system comprises a second stock bin, a third stock bin, a second processing assembly, a third processing assembly and a second boiler, the second stock bin is used for storing biomass, the third stock bin is used for storing coal, the second processing assembly is connected between the second stock bin and the second boiler, and the third processing assembly is connected between the third stock bin and the second boiler. According to the composite boiler system integrating biomass direct combustion and parallel coupling blending combustion, the blending combustion proportion of biomass in the boiler system can be increased by integrating two boiler combustion modes of biomass direct combustion and biomass and coal parallel coupling blending combustion.

Description

TECHNICAL FIELD

[0001] The utility model relates to a boiler technical field especially is related to a kind of integrated biomass direct combustion and parallel coupling composite boiler system of mixed combustion. BACKGROUND

[0002] In view of the deepening implementation of double carbon policy, it is inevitable to transform and upgrade traditional high-carbon emission energy.

[0003] Biomass and coal powder direct mixed combustion as an innovative way has the advantages of high technical maturity, low operating cost and strong fuel adaptability within a certain range.

[0004] The patent document "a kind of coal powder boiler direct combustion biomass system and mixed combustion method" (CN112902146B) proposes a kind of coal powder boiler direct combustion mixed biomass system and mixed combustion method, dry biomass molding fuel is mixed with raw coal and then directly sent into burner combustion. However, the mixed combustion ratio of biomass in this method is low. UTILITY MODEL CONTENT

[0005] The utility model aims at at least one of the technical problems existing in the prior art. To this end, the utility model provides a kind of integrated biomass direct combustion and parallel coupling composite boiler system of mixed combustion, which can improve the mixed combustion ratio of biomass.

[0006] According to the integrated biomass direct combustion and parallel coupling composite boiler system of mixed combustion of the utility model, it comprises: a steam turbine; a first boiler system comprising a first bin, a first processing assembly and a first boiler, the first bin is used to store biomass, the first processing assembly is connected between the first bin and the first boiler, the first processing assembly is adapted to process the biomass in the first bin and deliver to the first boiler, and the first boiler is adapted to drive the steam turbine; a second boiler system comprising a second bin, a third bin, a second processing assembly, a third processing assembly and a second boiler, the second bin is used to store biomass, the third bin is used to store coal, the second processing assembly is connected between the second bin and the second boiler, the second processing assembly is adapted to process the biomass in the second bin and deliver to the second boiler, the third processing assembly is connected between the third bin and the second boiler, the third processing assembly is adapted to process the coal in the third bin and deliver to the second boiler, and the second boiler is adapted to drive the steam turbine.

[0007] According to this utility model, the integrated biomass direct combustion and parallel coupled co-firing composite boiler system integrates two boiler combustion methods: direct biomass combustion and parallel coupled co-firing of biomass and coal. This increases the proportion of biomass in the integrated biomass direct combustion and parallel coupled co-firing composite boiler system, allowing for adjustments to the ratio of biomass and coal within a wider range. This reduces environmental pollution from the integrated biomass direct combustion and parallel coupled co-firing composite boiler system and contributes to the optimization of energy structure and sustainable development.

[0008] According to some embodiments of the present invention, the first hopper and the second hopper are integrated into one unit.

[0009] According to some embodiments of this utility model, the integrated biomass direct combustion and parallel coupled co-firing composite boiler system further includes: a feedwater pump, which is adapted to be connected to an external water circuit; the first boiler system further includes: a first heat exchanger, which is adapted to be connected to the outlet end of the feedwater pump; the outlet end of the first boiler is adapted to be connected to the first heat exchanger; and the outlet end of the first heat exchanger is adapted to be connected to the steam turbine.

[0010] According to some embodiments of the present invention, the second boiler system further includes: a second heat exchanger, the second heat exchanger being adapted to be connected to the outlet end of the feedwater pump, the steam outlet end of the second boiler being adapted to be connected to the second heat exchanger, and the steam outlet end of the second heat exchanger being adapted to be connected to the steam turbine.

[0011] According to some embodiments of the present invention, the integrated biomass direct combustion and parallel coupled co-firing composite boiler system further includes: a condenser, which is connected in series between the steam turbine outlet and the feedwater pump.

[0012] According to some embodiments of the present invention, the first processing component includes: a first conveyor belt, a first dryer, a first crusher, and a first grinder, wherein the first conveyor belt, the first dryer, the first crusher, and the first grinder are sequentially connected between the first silo and the first boiler.

[0013] According to some embodiments of the present invention, the second processing component includes: a second conveyor belt, a second dryer, a second crusher, and a second grinder, wherein the second conveyor belt, the second dryer, the second crusher, and the second grinder are sequentially connected between the second silo and the second boiler.

[0014] According to some embodiments of the present invention, the third processing component includes a third conveyor belt and a third grinding machine, wherein the third conveyor belt and the third grinding machine are sequentially connected between the second silo and the second boiler.

[0015] According to some embodiments of the present invention, the integrated biomass direct combustion and parallel coupled co-firing composite boiler system further includes: an air preheater, wherein the first heat exchanger and the second heat exchanger are adapted to communicate with the air preheater to heat the airflow in the air preheater, and the air outlet of the air preheater is adapted to communicate with the first dryer, the first grinder, the second dryer and the third grinder.

[0016] According to some embodiments of the present invention, the first boiler is a fluidized bed boiler or a grate boiler.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a composite boiler system integrating direct biomass combustion and parallel coupled co-firing according to an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of a composite boiler system integrating direct biomass combustion and parallel coupled co-firing according to another embodiment of the present invention.

[0020] Figure label:

[0021] 100. A composite boiler system integrating direct combustion of biomass and parallel coupled co-firing;

[0022] 10. First boiler; 11. First silo; 12. First heat exchanger; 13. First conveyor belt; 14. First dryer; 15. First crusher; 16. First grinding mill;

[0023] 20. Second boiler; 21. Second silo; 22. Third silo; 23. Second heat exchanger; 24. Second conveyor belt; 25. Second dryer; 26. Second crusher; 27. Second grinding mill; 28. Third conveyor belt; 29. ​​Third grinding mill;

[0024] 30. Steam turbine;

[0025] 40. Water supply pump;

[0026] 50. Condenser;

[0027] 60. Air preheater. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0029] The following is for reference. Figure 1 and Figure 2 This invention describes a composite boiler system 100 that integrates direct biomass combustion and parallel coupled co-firing according to an embodiment of the present invention.

[0030] like Figure 1 and Figure 2 As shown, the integrated biomass direct combustion and parallel coupled co-firing composite boiler system 100 according to an embodiment of the present utility model includes: a steam turbine 30, a first boiler system, and a second boiler system.

[0031] Specifically, the first boiler system includes a first silo 11, a first processing component, and a first boiler 10. The first silo 11 is used to store biomass. The first processing component is connected between the first silo 11 and the first boiler 10. The first processing component is adapted to process the biomass in the first silo 11 and transport it to the first boiler 10. The first boiler 10 is adapted to drive a steam turbine 30. The second boiler system includes a second silo 21, a third silo 22, a second processing component, a third processing component, and a second boiler 20. The second silo 21 is used to store biomass. The third silo 22 is used to store coal. The second processing component is connected between the second silo 21 and the second boiler 20. The second processing component is adapted to process the biomass in the second silo 21 and transport it to the second boiler 20. The third processing component is connected between the third silo 22 and the second boiler 20. The third processing component is adapted to process the coal in the third silo 22 and transport it to the second boiler 20. The second boiler 20 is adapted to drive a steam turbine 30.

[0032] During the operation of the integrated biomass direct combustion and parallel coupled co-firing composite boiler system 100, either the first boiler 10 or the second boiler 20 can drive the steam turbine 30 individually, or the first boiler 10 and the second boiler 20 can drive the steam turbine 30 simultaneously.

[0033] During the operation of the first boiler system, the first processing component processes the biomass in the first silo 11 to make the biomass suitable for combustion, and then transports the processed biomass to the first boiler 10. The biomass is burned in the first boiler 10, which drives the steam turbine 30. That is, the first boiler 10 adopts the direct combustion method of biomass.

[0034] During the operation of the second boiler system, the second processing component processes the biomass in the second silo 21 to make it suitable for combustion, and then transports the processed biomass to the second boiler 20. At the same time, the third processing component processes the coal in the third silo 22 to make it suitable for combustion, and then transports the processed coal to the second boiler 20. The biomass and coal are burned in the second boiler 20, which drives the steam turbine 30. That is, the second boiler 20 adopts a combustion method of parallel coupled co-firing of biomass and coal.

[0035] Understandably, by setting up a first boiler system for direct biomass combustion, the proportion of biomass co-firing is higher during the operation of the composite boiler system 100 that integrates direct biomass combustion and parallel coupled co-firing. Furthermore, when it is necessary to adjust the biomass co-firing ratio, the biomass co-firing ratio can be adjusted by adjusting the biomass combustion amount in the first boiler system and the second boiler system, making the adjustment of the biomass co-firing ratio relatively easy.

[0036] The integrated biomass direct combustion and parallel coupled co-firing composite boiler system 100 according to the present invention integrates two boiler combustion methods: direct biomass combustion and parallel coupled co-firing of biomass and coal. This increases the proportion of biomass in the integrated biomass direct combustion and parallel coupled co-firing composite boiler system 100, allowing the proportion of biomass and coal to be adjusted within a wider range. This reduces the environmental pollution of the integrated biomass direct combustion and parallel coupled co-firing composite boiler system 100 and helps to optimize the energy structure and achieve sustainable development.

[0037] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the first hopper 11 and the second hopper 21 are integrated into one unit.

[0038] During the operation of the first boiler system and the second boiler system, the first processing component and the second processing component simultaneously process and transport the biomass in the integrated bin of the first bin 11 and the third bin 22. When biomass raw materials need to be added, adding biomass raw materials in the integrated bin of the first bin 11 and the third bin 22 can realize the feeding of biomass into the first boiler system and the second boiler system.

[0039] This simplifies the structure of the integrated biomass direct combustion and parallel coupled co-firing composite boiler system 100, thereby reducing the production cost and design difficulty of the integrated biomass direct combustion and parallel coupled co-firing composite boiler system 100.

[0040] In some embodiments of this utility model, such as Figure 1 and Figure 2As shown, the integrated biomass direct combustion and parallel coupled co-firing composite boiler system 100 further includes: a feed water pump 40, which is adapted to be connected to an external water circuit. The first boiler system further includes: a first heat exchanger 12, which is adapted to be connected to the water outlet of the feed water pump 40. The gas outlet of the first boiler 10 is adapted to be connected to the first heat exchanger 12, and the gas outlet of the first heat exchanger 12 is adapted to be connected to the steam turbine 30.

[0041] During the process of the first boiler system driving the steam turbine 30, the feedwater pump 40 delivers water to the first heat exchanger 12. The high-temperature flue gas in the first boiler 10 enters the first heat exchanger 12 and heats the water in the first heat exchanger 12, heating the water in the first heat exchanger 12 to a high-temperature steam state. The high-temperature steam enters the steam turbine 30 from the outlet of the first heat exchanger 12 and drives the steam turbine 30. Thus, the first boiler 10 can drive the steam turbine 30.

[0042] The first heat exchanger 12 outputs steam in a relatively stable and uniform manner. The first boiler 10 drives the steam turbine 30 through the first heat exchanger 12, which can improve the stability of the first boiler 10 driving the steam turbine 30.

[0043] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the second boiler system also includes: a second heat exchanger 23, which is adapted to be connected to the outlet end of the feedwater pump 40, the outlet end of the second boiler 20 is adapted to be connected to the second heat exchanger 23, and the outlet end of the second heat exchanger 23 is adapted to be connected to the steam turbine 30.

[0044] During the process of the second boiler system driving the steam turbine 30, the feedwater pump 40 delivers water to the second heat exchanger 23. The high-temperature flue gas in the second boiler 20 enters the second heat exchanger 23 and heats the water in the second heat exchanger 23, heating it to a high-temperature steam state. The high-temperature steam enters the steam turbine 30 from the outlet of the second heat exchanger 23 and drives the steam turbine 30. Thus, the second boiler 20 can drive the steam turbine 30.

[0045] The second heat exchanger 23 outputs steam in a relatively stable and uniform manner. The second boiler 20 drives the steam turbine 30 through the second heat exchanger 23, which can improve the stability of the second boiler 20 driving the steam turbine 30.

[0046] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the integrated biomass direct combustion and parallel coupled co-firing composite boiler system 100 also includes: a condenser 50, which is connected in series between the steam turbine 30 outlet end and the feedwater pump 40.

[0047] During the operation of the integrated biomass direct combustion and parallel coupled co-firing composite boiler system 100, a significant proportion of the steam remains in a steam state after the steam acts on the turbine 30. By setting up a condenser 50, the steam flowing out of the turbine 30 will be liquefied into liquid water in the condenser 50, and then enter the feed water pump 40 together with the liquid water flowing out of the steam outlet of the turbine 30, thus participating in the subsequent working cycle. In this way, water can be recycled during the operation of the integrated biomass direct combustion and parallel coupled co-firing composite boiler system 100.

[0048] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the first processing assembly includes: a first conveyor belt 13, a first dryer 14, a first crusher 15 and a first grinder 16, which are sequentially connected between the first silo 11 and the first boiler 10.

[0049] During the operation of the first boiler system, the biomass in the first silo 11 is conveyed to the first dryer 14 via the first conveyor belt 13. The first dryer 14 dries the biomass, and then the dried biomass enters the first crusher 15. The first crusher 15 crushes the biomass, and the crushed biomass enters the first grinder 16. The first grinder 16 grinds the crushed biomass into smaller particles suitable for combustion, and then the small particles of biomass enter the first boiler 10 for combustion.

[0050] Thus, the first processing component processes and transports the biomass in the first silo 11.

[0051] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the second processing component includes: a second conveyor belt 24, a second dryer 25, a second crusher 26, and a second grinder 27. The second conveyor belt 24, the second dryer 25, the second crusher 26, and the second grinder 27 are sequentially connected between the second silo 21 and the second boiler 20.

[0052] During the operation of the second boiler system, the biomass in the second silo 21 is conveyed to the second dryer 25 via the second conveyor belt 24. The second dryer 25 dries the biomass, and then the dried biomass enters the second crusher 26, which crushes the biomass. The crushed biomass then enters the second grinder 27, which grinds the crushed biomass into smaller particles suitable for combustion. Subsequently, the small particles of biomass enter the second boiler 20 for combustion.

[0053] Thus, the second processing component can process and transport the biomass in the second silo 21.

[0054] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the third processing component includes a third conveyor belt 28 and a third grinding mill 29, which are connected sequentially between the second silo 21 and the second boiler 20.

[0055] During the operation of the second boiler system, the coal in the third silo 22 is transported to the third grinder 29 via the second conveyor belt 24. The third grinder 29 grinds the coal into small particles suitable for combustion, and then the small coal particles enter the second boiler 20 for combustion.

[0056] This enables the third processing component to process and transport the coal in the third silo 22.

[0057] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the integrated biomass direct combustion and parallel coupled co-firing composite boiler system 100 further includes: an air preheater 60, a first heat exchanger 12 and a second heat exchanger 23 adapted to be connected to the air preheater 60 to heat the airflow inside the air preheater 60, and the air outlet of the air preheater 60 adapted to be connected to the first dryer 14, the first grinder 16, the second dryer 25 and the third grinder 29.

[0058] During the operation of the integrated biomass direct combustion and parallel coupled co-firing composite boiler system 100, the first heat exchanger 12 and the second heat exchanger 23 heat the airflow within the air preheater 60. The heated airflow then enters the first dryer 14, the first grinder 16, the second dryer 25, and the third grinder 29, respectively. In the first dryer 14 and the second dryer, the heated airflow dries the biomass. In the first grinder 16 and the third grinder 29, the mixing degree of small-particle biomass and small-particle coal with air is increased, thereby improving combustion efficiency. Simultaneously, the heated airflow in the air preheater 60 before entering the first dryer 14, the first grinder 16, the second dryer 25, and the third grinder 29 increases the fuel temperature, further improving combustion efficiency.

[0059] In some embodiments of this utility model, the first boiler 10 is a fluidized bed boiler or a grate boiler.

[0060] Among them, fluidized bed boilers have strong fuel adaptability, can burn biomass fuel well, and have high combustion efficiency.

[0061] Similarly, grate furnaces have strong fuel adaptability, can burn biomass fuel well, and have high combustion efficiency.

[0062] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0063] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0064] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0066] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A composite boiler system integrating direct combustion of biomass and parallel coupled co-firing, characterized in that, include: Steam turbine; A first boiler system includes a first silo, a first processing assembly, and a first boiler. The first silo is used to store biomass. The first processing assembly is connected between the first silo and the first boiler. The first processing assembly is adapted to process the biomass in the first silo and transport it to the first boiler. The first boiler is adapted to drive the steam turbine. The second boiler system includes a second silo, a third silo, a second processing assembly, a third processing assembly, and a second boiler. The second silo is used to store biomass, and the third silo is used to store coal. The second processing assembly is connected between the second silo and the second boiler, and is adapted to process the biomass in the second silo and transport it to the second boiler. The third processing assembly is connected between the third silo and the second boiler. The third processing assembly is adapted to process the coal in the third silo and transport it to the second boiler, which is adapted to drive the steam turbine.

2. The integrated biomass direct combustion and parallel coupled co-firing composite boiler system according to claim 1, characterized in that, The first silo and the second silo are integrated into one unit.

3. The integrated biomass direct combustion and parallel coupled co-firing composite boiler system according to claim 1, characterized in that, The integrated biomass direct combustion and parallel coupled co-firing composite boiler system also includes a feedwater pump, which is adapted to be connected to an external water system. The first boiler system further includes: a first heat exchanger, the first heat exchanger being adapted to be connected to the outlet end of the feedwater pump, the steam outlet end of the first boiler being adapted to be connected to the first heat exchanger, and the steam outlet end of the first heat exchanger being adapted to be connected to the steam turbine.

4. The integrated biomass direct combustion and parallel coupled co-firing composite boiler system according to claim 3, characterized in that, The second boiler system further includes: a second heat exchanger, the second heat exchanger being adapted to be connected to the outlet end of the feedwater pump, the steam outlet end of the second boiler being adapted to be connected to the second heat exchanger, and the steam outlet end of the second heat exchanger being adapted to be connected to the steam turbine.

5. The integrated biomass direct combustion and parallel coupled co-firing composite boiler system according to claim 4, characterized in that, The integrated biomass direct combustion and parallel coupled co-firing composite boiler system further includes a condenser connected in series between the steam turbine outlet and the feedwater pump.

6. The integrated biomass direct combustion and parallel coupled co-firing composite boiler system according to claim 5, characterized in that, The first processing component includes a first conveyor belt, a first dryer, a first crusher, and a first grinder, wherein the first conveyor belt, the first dryer, the first crusher, and the first grinder are sequentially connected between the first silo and the first boiler.

7. The integrated biomass direct combustion and parallel coupled co-firing composite boiler system according to claim 6, characterized in that, The second processing component includes: a second conveyor belt, a second dryer, a second crusher, and a second grinder, wherein the second conveyor belt, the second dryer, the second crusher, and the second grinder are sequentially connected between the second silo and the second boiler.

8. The integrated biomass direct combustion and parallel coupled co-firing composite boiler system according to claim 7, characterized in that, The third processing component includes a third conveyor belt and a third grinding machine, which are sequentially connected between the second silo and the second boiler.

9. The integrated biomass direct combustion and parallel coupled co-firing composite boiler system according to claim 8, characterized in that, The integrated biomass direct combustion and parallel coupled co-firing composite boiler system further includes: an air preheater, wherein the first heat exchanger and the second heat exchanger are adapted to be connected to the air preheater to heat the airflow within the air preheater. The air outlet of the air preheater is adapted to be connected to the first dryer, the first grinder, the second dryer, and the third grinder.

10. The integrated biomass direct combustion and parallel coupled co-firing composite boiler system according to claim 1, characterized in that, The first boiler is a fluidized bed boiler or a grate boiler.

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