CN115853610B - Sludge drying coupling coal-fired unit frequency modulation peak shaving system and method - Google Patents
Sludge drying coupling coal-fired unit frequency modulation peak shaving system and method Download PDFInfo
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- CN115853610B CN115853610B CN202310193591.8A CN202310193591A CN115853610B CN 115853610 B CN115853610 B CN 115853610B CN 202310193591 A CN202310193591 A CN 202310193591A CN 115853610 B CN115853610 B CN 115853610B
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Abstract
The embodiment of the invention relates to the technical field of frequency modulation and peak shaving, in particular to a sludge drying coupling coal-fired unit frequency modulation and peak shaving system and method. The system comprises a dryer, a coal-fired boiler, a steam turbine, a generator and thermochemical energy storage equipment, wherein the coal-fired boiler is used for mixing and burning coal dust and dry mud obtained by the dryer, and the thermochemical energy storage equipment comprises a heat carrier and an electric heater arranged in the heat carrier; when the heat storage device is in heat storage operation, the electric heater receives electric energy transmitted by the generator so as to heat and decompose the heat carrier to generate superheated steam, and the superheated steam is used for being introduced into the dryer to dry sludge to be dried for one time; during exothermic operation, the heat carrier after heating and decomposing absorbs the exhaust steam of the steam turbine to release energy, the released energy is used for heating cold dry air into hot dry air, and the hot dry air is used for being introduced into a dryer to carry out secondary drying on sludge to be dried. The scheme provided by the invention can realize sludge drying and improve the flexibility of the unit.
Description
Technical Field
The embodiment of the invention relates to the technical field of frequency modulation and peak shaving, in particular to a sludge drying coupling coal-fired unit frequency modulation and peak shaving system and method.
Background
The thermal power plant system in China has wide distribution, high annual coal consumption and great potential of sludge blending combustion. The energy required by sludge drying is more, and the energy consumed by sludge drying greatly reduces the power generation efficiency of the biomass power generation system. Meanwhile, the regulation capability of the thermal power generating unit is reduced after the sludge is mixed and burned, and the flexibility of the unit is reduced, so that the regulation supporting capability of the unit on a power grid is reduced, and the peak regulation income of a power plant and the renewable energy consumption capability of a power system in an area are reduced.
Due to the fact that sludge is mixed and burned, the stability of boiler combustion is reduced, the minimum load of the unit is improved, and the regulation performance of the unit is reduced. Therefore, how to realize sludge drying and improve the flexibility of a unit is a problem to be solved at present.
Disclosure of Invention
The embodiment of the invention provides a sludge drying coupling coal-fired unit frequency modulation peak shaving system and a sludge drying coupling coal-fired unit frequency modulation peak shaving method, which can realize sludge drying and improve unit flexibility.
In a first aspect, an embodiment of the invention provides a sludge drying coupling coal-fired unit frequency modulation peak shaving system, which comprises a dryer, a coal-fired boiler, a steam turbine, a generator and thermochemical energy storage equipment, wherein:
the coal-fired boiler is connected with the dryer and is used for carrying out mixed combustion on coal dust and dry mud obtained by the dryer;
the coal-fired boiler, the steam turbine and the generator are sequentially connected, the thermochemical energy storage equipment is respectively connected with the steam turbine, the generator and the dryer, and the thermochemical energy storage equipment comprises a heat carrier and an electric heater arranged in the heat carrier;
when the heat storage operation is performed, the electric heater receives the electric energy transmitted by the generator so as to heat and decompose the heat carrier to generate superheated steam, and the superheated steam is used for being introduced into the dryer to dry the sludge to be dried once;
during exothermic operation, the heat carrier after heating and decomposing absorbs the exhaust steam of the steam turbine to release energy, the released energy is used for heating cold dry air into hot dry air, and the hot dry air is used for being introduced into the dryer to carry out secondary drying on the sludge to be dried.
In a second aspect, the embodiment of the invention also provides a frequency modulation and peak shaving method of the sludge drying coupling coal-fired unit, which adopts the frequency modulation and peak shaving system of the sludge drying coupling coal-fired unit, and the method comprises the following steps:
when the heat storage operation is performed, the electric heater is used for receiving the electric energy transmitted by the generator so as to heat and decompose the heat carrier to generate superheated steam, and the superheated steam is used for being introduced into the dryer to dry the sludge to be dried for one time;
during exothermic operation, the heat carrier after heating and decomposing is utilized to absorb the exhaust steam of the steam turbine so as to release energy, the released energy is used for heating cold dry air into hot dry air, and the hot dry air is used for being introduced into the dryer so as to carry out secondary drying on the sludge to be dried.
The embodiment of the invention provides a sludge drying coupling coal-fired unit frequency modulation peak shaving system and a method, which are characterized in that a thermochemical energy storage device respectively connected with a steam turbine, a generator and a dryer is additionally arranged, so that the system has two flexible frequency modulation peak shaving modes of heat storage operation and heat release operation; when the heat storage operation is performed, the electric heater receives electric energy transmitted by the generator so as to heat and decompose the heat carrier to generate superheated steam, and the superheated steam is used for being introduced into the dryer to dry sludge to be dried once; during exothermic operation, the heat carrier after heating and decomposing absorbs the exhaust steam of the steam turbine to release energy, the released energy is used for heating cold dry air into hot dry air, and the hot dry air is used for being introduced into a dryer to carry out secondary drying on sludge to be dried. Therefore, the technical scheme can improve the flexibility of the unit while realizing sludge drying.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a sludge drying coupling coal-fired unit frequency modulation peak shaving system provided by the embodiment of the invention;
FIG. 2 is a front view of a thermochemical energy storage device in the frequency modulation and peak shaving system of the sludge drying coupled coal-fired unit shown in FIG. 1;
fig. 3 is a flow chart of a sludge drying coupling coal-fired unit frequency modulation peak shaving method provided by the embodiment of the invention.
Reference numerals:
1-a dryer; 2-a coal-fired boiler; 3-a steam turbine; a 4-generator; 5-a thermochemical energy storage device; 6-a conveyor belt; 7-a collector; 8-a dry sludge reservoir; 9-a grinder;
51-a heat carrier; 52-an electric heater; 511-top; 512-bottom; 513-middle.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some, but not all, embodiments of the present invention, and all other embodiments obtained by persons of ordinary skill in the art without making any inventive effort based on the embodiments of the present invention are within the scope of protection of the embodiments of the present invention.
As shown in fig. 1 and 2, the embodiment of the invention provides a sludge drying coupling coal-fired unit frequency modulation peak shaving system, which comprises a dryer 1, a coal-fired boiler 2, a steam turbine 3, a generator 4 and thermochemical energy storage equipment 5, wherein:
the coal-fired boiler 2 is connected with the dryer 1, and the coal-fired boiler 2 is used for carrying out mixed combustion on coal dust and dry mud obtained by the dryer 1;
the coal-fired boiler 2, the steam turbine 3 and the generator 4 are sequentially connected, the thermochemical energy storage device 5 is respectively connected with the steam turbine 3, the generator 4 and the dryer 1, and the thermochemical energy storage device 5 comprises a heat carrier 51 and an electric heater 52 arranged in the heat carrier 51;
in the heat storage operation, the electric heater 52 receives the electric energy transmitted by the generator 4 to heat and decompose the heat carrier 51 to generate superheated steam (the temperature of which is about 400 ℃ generally), and the superheated steam is used for being introduced into the dryer 1 to dry the sludge to be dried for the first time;
in the exothermic operation, the heat carrier 51 after the thermal decomposition absorbs the exhaust steam of the steam turbine 3 to release energy, and the released energy is used for heating cold dry air into hot dry air, and the hot dry air is used for being introduced into the dryer 1 to carry out secondary drying on sludge to be dried.
In the embodiment, the thermochemical energy storage equipment 5 respectively connected with the steam turbine 3, the generator 4 and the dryer 1 is additionally arranged, so that the system has two flexible frequency modulation and peak shaving modes of heat storage operation and heat release operation; wherein, during the heat storage operation, the electric heater 52 receives the electric energy transmitted by the generator 4 to heat and decompose the heat carrier 51 to generate superheated steam, and the superheated steam is used for being introduced into the dryer 1 to dry the sludge to be dried once; in the exothermic operation, the heat carrier 51 after the thermal decomposition absorbs the exhaust steam of the steam turbine 3 to release energy, and the released energy is used for heating cold dry air into hot dry air, and the hot dry air is used for being introduced into the dryer 1 to carry out secondary drying on sludge to be dried. Therefore, the technical scheme can improve the flexibility of the unit while realizing sludge drying.
In one embodiment of the invention, the heat carrier 51 is calcium hydroxide or magnesium hydroxide during heat storage operation;
in exothermic operation, the heat carrier 51 is calcium oxide or magnesium oxide.
In the present embodiment, in the heat storage operation, calcium hydroxide or magnesium hydroxide is decomposed by the heat of the electric heater 52 to generate superheated steam, which absorbs a large amount of heat; in exothermic operation, calcium oxide or magnesium oxide (i.e., the heat carrier 51 after thermal decomposition) absorbs the exhaust gas of the steam turbine 3 to become calcium hydroxide or magnesium hydroxide, which emits a large amount of heat.
Of course, the heat carrier 51 may be other hydroxides, and will not be described in detail herein.
With continued reference to fig. 2, in one embodiment of the present invention, the heat carrier 51 includes a top 511, a bottom 512, and a plurality of intermediate portions 513 disposed between the top 511 and the bottom 512, the electric heaters 52 are continuously disposed in the top 511, the intermediate portions 513, and the bottom 512, and the electric heaters 52 are disposed in all of the intermediate portions 513.
In the present embodiment, by providing a plurality of intermediate portions 513, it is possible to conveniently and rapidly heat cool dry air into hot dry air; by providing the heat carrier 51 to include the top portion 511, the bottom portion 512, and the plurality of intermediate portions 513 provided between the top portion 511 and the bottom portion 512, the heat exchange path and the amount of heat exchange can be increased, so that more sufficient products (e.g., superheated steam, hot dry air, etc.) can be obtained.
In one embodiment of the present invention, the middle portion 513 is provided in plural in both the longitudinal direction (i.e., the left-to-right direction in fig. 2) and the width direction (i.e., the direction directed inward from the paper surface in fig. 2). By the arrangement, the heat exchange path and the heat exchange amount can be further increased, so that a more sufficient product can be obtained.
In one embodiment of the invention, adjacent columns of intermediate portions 513 are staggered in the direction of cool dry air travel. By the arrangement, the cold dry air can be heated into the hot dry air more quickly, so that the effect of rapid frequency modulation and peak shaving is achieved.
In one embodiment of the present invention, each of the middle portions 513 includes a cylindrical body and a spiral sheet (not shown) disposed at the outer circumference of the cylindrical body in the height direction. By doing so, it is possible to ensure that the cool dry air is in more sufficient contact with each of the intermediate portions 513, so that the cool dry air can be heated to the hot dry air more quickly.
In one embodiment of the invention, the flights of each intermediate portion 513 in the same column are of the same sense and the flights of each intermediate portion 513 in adjacent columns are of opposite sense. By this arrangement, the flow of the cold dry air can be made more chaotic, i.e., the entropy increases, so that the cold dry air can be heated to the hot dry air more quickly.
In one embodiment of the present invention, each of the middle portions 513 includes a cylinder and a plurality of circular ring pieces (not shown) disposed at the outer circumference of the cylinder in the height direction. By doing so, it is possible to ensure that the cool dry air is in more sufficient contact with each of the intermediate portions 513, so that the cool dry air can be heated to the hot dry air more quickly.
The middle portion 513 of the circular ring sheet may heat cool dry air to hot dry air more quickly than the middle portion 513 of the spiral sheet.
In one embodiment of the present invention, the above system further comprises a conveyor belt 6, a collector 7, a dry sludge reservoir 8 and a grinder 9, which are sequentially disposed between the dryer 1 and the coal-fired boiler 2, the conveyor belt 6 being used for transporting dry sludge from the dryer 1 into the collector 7, the dry sludge reservoir 8 being located below an outlet of a bottom 512 of the collector 7, and the grinder 9 being used for grinding dry sludge from the dry sludge reservoir 8 and feeding the ground dry sludge into the coal-fired boiler 2.
In this embodiment, by arranging the dry sludge storage 8 between the dryer 1 and the coal-fired boiler 2, the buffer effect before the dry sludge enters the coal-fired boiler 2 is realized, so that on the basis of effectively treating the sludge, the variable load adjustment capability that the sludge directly enters the coal-fired boiler 2 for blending combustion does not exist after being changed into the dry sludge is also solved, namely, when the load adjustment is carried out on a unit, more or less dry sludge can be produced by using the dryer 1, and the dry sludge is stored by the dry sludge storage 8, so that the dry sludge storage 8 is used as a buffer container to indirectly realize the effect of unit load adjustment.
In addition, by arranging the conveyor belt 6 and the collector 7, the dry mud discharged from the dryer 1 can more conveniently enter the dry mud storage 8, namely, the dry mud collecting efficiency is improved; by arranging the grinder 9, the dry mud entering the coal-fired boiler 2 can be ensured to be better mixed with the coal dust for burning. Here, the specific structure of the grinder 9 is not limited.
It will be appreciated that the specific structure of the dryer 1 includes at least two layers of drying rollers for driving the sludge to move (i.e. the sludge travels in the middle area of the dryer 1 shown in fig. 1, and the superheated steam and the hot air pass through the area) and a driving mechanism for driving the drying rollers to rotate, and other detailed structures of the dryer 1 are not limited and are not described in detail in this embodiment, which is well known to those skilled in the art.
In addition, as shown in fig. 3, the embodiment of the invention also provides a frequency modulation and peak shaving method of the sludge drying coupled coal-fired unit, which adopts the sludge drying coupled coal-fired unit frequency modulation and peak shaving system mentioned in any one of the above embodiments, and comprises the following steps:
step S1, during heat storage operation, electric energy transmitted by the generator 4 is received by the electric heater 52 so as to heat and decompose the heat carrier 51 to generate superheated steam, and the superheated steam is used for being introduced into the dryer 1 to dry sludge to be dried once;
in the step S2, during the exothermic operation, the heat carrier 51 after the heating decomposition is utilized to absorb the exhaust steam of the steam turbine 3 to release energy, the released energy is used for heating the cold dry air into the hot dry air, and the hot dry air is used for being introduced into the dryer 1 to carry out secondary drying on the sludge to be dried.
It should be noted that, the frequency modulation and peak regulation method of the sludge drying coupled coal-fired unit provided by the embodiment and the frequency modulation and peak regulation system of the sludge drying coupled coal-fired unit provided by the embodiment are based on the same inventive concept, so that the two have the same beneficial effects, and no description is given here.
It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the embodiments of the present invention, and are not limited thereto; although embodiments of the present invention have been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. The utility model provides a sludge drying coupling coal-fired unit frequency modulation peak shaving system which characterized in that, includes desicator (1), coal fired boiler (2), steam turbine (3), generator (4) and thermochemical energy storage device (5), wherein:
the coal-fired boiler (2) is connected with the dryer (1), and the coal-fired boiler (2) is used for mixing and burning coal dust and dry mud obtained by the dryer (1);
the coal-fired boiler (2), the steam turbine (3) and the generator (4) are sequentially connected, the thermochemical energy storage equipment (5) is respectively connected with the steam turbine (3), the generator (4) and the dryer (1), and the thermochemical energy storage equipment (5) comprises a heat carrier (51) and an electric heater (52) arranged in the heat carrier (51);
when the heat storage operation is performed, the electric heater (52) receives electric energy transmitted by the generator (4) to heat and decompose the heat carrier (51) to generate superheated steam, and the superheated steam is used for being introduced into the dryer (1) to dry sludge to be dried for one time;
during exothermic operation, the heat carrier (51) after heating and decomposing absorbs the exhaust steam of the steam turbine (3) to release energy, the released energy is used for heating cold dry air into hot dry air, and the hot dry air is used for being introduced into the dryer (1) to carry out secondary drying on the sludge to be dried;
in the heat storage operation, the heat carrier (51) is magnesium hydroxide;
in exothermic operation, the heat carrier (51) is magnesium oxide;
the heat carrier (51) includes a top (511), a bottom (512), and a plurality of intermediate portions (513) disposed between the top (511) and the bottom (512), the electric heater (52) is continuously disposed in the top (511), the intermediate portions (513), and the bottom (512), and the electric heater (52) is disposed in all of the intermediate portions (513);
the middle part (513) is provided with a plurality of parts along the length direction and the width direction so as to increase the heat exchange path and the heat exchange quantity;
two adjacent rows of middle parts (513) are staggered along the running direction of the cold dry air;
each of the intermediate portions (513) includes a cylindrical body and a spiral piece provided at an outer periphery of the cylindrical body in a height direction;
the spiral sheets of each middle part (513) in the same column have the same rotation direction, and the spiral sheets of the middle parts (513) in two adjacent columns have opposite rotation directions so as to increase the entropy of dry air, thereby heating cold dry air into hot dry air more quickly.
2. The sludge drying coupling coal-fired unit frequency modulation peak shaving system according to claim 1, further comprising a conveyor belt (6), a collector (7), a dry sludge storage (8) and a grinder (9) which are sequentially arranged between the dryer (1) and the coal-fired boiler (2), wherein the conveyor belt (6) is used for conveying dry sludge from the dryer (1) into the collector (7), the dry sludge storage (8) is positioned below an outlet of a bottom (512) of the collector (7), and the grinder (9) is used for grinding the dry sludge from the dry sludge storage (8) and then feeding the dry sludge into the coal-fired boiler (2).
3. A sludge drying coupling coal-fired unit frequency modulation and peak shaving method, which is characterized in that the sludge drying coupling coal-fired unit frequency modulation and peak shaving system as claimed in any one of claims 1-2 is adopted, and the method comprises the following steps:
during heat storage operation, the electric heater (52) is utilized to receive electric energy transmitted by the generator (4) so as to heat and decompose the heat carrier (51) to generate superheated steam, and the superheated steam is used for being introduced into the dryer (1) to dry sludge to be dried once;
during exothermic operation, the heat carrier (51) after heating and decomposing is utilized to absorb the exhaust steam of the steam turbine (3) so as to release energy, the released energy is used for heating cold dry air into hot dry air, and the hot dry air is used for being introduced into the dryer (1) so as to carry out secondary drying on the sludge to be dried.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310193591.8A CN115853610B (en) | 2023-03-03 | 2023-03-03 | Sludge drying coupling coal-fired unit frequency modulation peak shaving system and method |
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| CN202310193591.8A CN115853610B (en) | 2023-03-03 | 2023-03-03 | Sludge drying coupling coal-fired unit frequency modulation peak shaving system and method |
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| CN115853610B true CN115853610B (en) | 2023-04-25 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6780210B2 (en) * | 1997-08-13 | 2004-08-24 | Edward E. Boss | Process for forming a fuel product from paper mill sludge |
| CN105737658B (en) * | 2016-04-30 | 2018-09-14 | 华南理工大学 | Fluidization calcium base thermochemical high temperature energy storage/release energy system and its working method |
| CN216278062U (en) * | 2021-09-15 | 2022-04-12 | 华北电力大学 | Heat pump electricity storage system integrated with thermochemical conversion |
| CN114542221A (en) * | 2022-02-22 | 2022-05-27 | 上海发电设备成套设计研究院有限责任公司 | Device system and method for power station peak shaving and sludge drying energy storage |
| CN115549114B (en) * | 2022-11-03 | 2023-04-25 | 中国电力工程顾问集团有限公司 | System and method for mixing and burning sludge, peak regulation and frequency modulation |
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