CN114542221A - Device system and method for power station peak shaving and sludge drying energy storage - Google Patents
Device system and method for power station peak shaving and sludge drying energy storage Download PDFInfo
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- CN114542221A CN114542221A CN202210160015.9A CN202210160015A CN114542221A CN 114542221 A CN114542221 A CN 114542221A CN 202210160015 A CN202210160015 A CN 202210160015A CN 114542221 A CN114542221 A CN 114542221A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K21/00—Steam engine plants not otherwise provided for
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a device system and a method for peak shaving and sludge drying energy storage of a power station, wherein the device system comprises a combustion power generation unit, a sludge drying unit and an incineration unit; an outlet of a steam turbine in the combustion power generation unit is connected with the sludge drying unit; the outlet of the sludge drying unit is connected with the inlet of the incineration unit; and the outlet of the waste heat boiler in the incineration unit is circularly connected with the sludge drying unit. The method adopts the device system to extract partial steam of the steam turbine for sludge drying treatment. The device system provided by the invention can store the redundant energy of the thermal power generating unit by utilizing the sludge drying process to finish the peak regulation of the power station, has a wider peak regulation range, and cannot influence the stable combustion of a power station boiler.
Description
Technical Field
The invention relates to the technical field of power system peak shaving and energy storage, in particular to a device system and a method for power station peak shaving and sludge drying energy storage.
Background
In recent years, the installed capacity of new energy resources such as wind power and photovoltaic is increased explosively. And the maximum load power consumption speed increase is not high and is far lower than the speed increase of a new energy installation machine. In order to match the power generation capacity with the power demand, thermal power generation is only required to take the role of grid peak shaving. If the peak shaving is carried out only by reducing the fuel quantity, the stable combustion of the boiler can be influenced after the generated energy of the thermal power generating unit is reduced to a certain degree. In this case, further peak shaving can only be achieved by converting the excess energy into energy in a form other than electrical energy.
The yield of the municipal sludge is increased year by year, the sludge contains a large amount of toxic and harmful refractory substances, and the sludge cannot be subjected to standardized treatment, so that secondary pollution is directly brought to water, soil and atmosphere, and the ecological environment is seriously threatened. The sludge incineration is the most 'thorough' sludge treatment mode, not only has high treatment speed, but also has high reduction degree, can recycle energy, and is a relatively feasible sludge treatment mode. Municipal sludge raw materials generally have high water content, and can be incinerated after the water content is reduced by sludge drying in advance. The sludge drying process needs to absorb more energy from the outside so as to accelerate the evaporation and discharge of the moisture in the wet sludge.
CN206291201U discloses a coal gas peak shaving power station, which generates power by reducing the amount of coal used and supplying the coal gas generated by coal gasification and the coal to a gas turbine together for combustion during peak-valley usage, and the peak shaving method has very limited peak shaving range, high treatment cost and can affect the stable combustion of a boiler.
CN107021603A discloses a sludge heat drying system with low energy consumption, which dries wet sludge by additionally arranging a steam boiler, a steam-water separator, a steam compressor and the like, and has the disadvantages of high equipment cost and low economical efficiency.
Therefore, the development of the peak shaving system and the peak shaving method which can effectively reduce the power generation amount of the thermal power generating unit and can realize the comprehensive utilization of energy is of great significance.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a device system and a method for peak shaving and sludge drying energy storage in a power station, and compared with the prior art, the device system provided by the present invention has a simple structure, can reduce the power generation amount of a thermal power generator set, and can store the redundant energy in a sludge drying manner.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a device system for peak shaving and sludge drying energy storage of a power station, which comprises a combustion power generation unit, a sludge drying unit and an incineration unit; an outlet of a steam turbine in the combustion power generation unit is connected with the sludge drying unit; the outlet of the sludge drying unit is connected with the inlet of the incineration unit; and the outlet of the waste heat boiler in the incineration unit is circularly connected with the sludge drying unit.
According to the invention, the combustion power generation unit, the sludge drying unit and the incineration unit are mutually matched, so that peak regulation and sludge drying energy storage of a power station can be realized, the peak regulation range is large, and the energy utilization rate is high. In the invention, the outlet of the steam turbine in the combustion power generation unit is connected with the sludge drying unit, so that excessive steam in the steam turbine can be conveyed to the sludge drying unit, the power generation amount of the thermal power generation unit is reduced, the peak shaving of a power station is completed, and the stability of a power station boiler cannot be influenced; meanwhile, excessive steam enters the sludge drying unit to carry out drying treatment on wet sludge, so that the water content of the sludge is reduced. According to the invention, the outlet of the waste heat boiler in the incineration unit is circularly connected with the sludge drying unit, so that waste heat generated by incineration can generate steam through the waste heat boiler and then returns to the sludge drying unit for sludge drying, and the high-efficiency recycling of energy is realized. Compared with the traditional thermal power generation peak regulation system, the device system provided by the invention has the advantages that the peak regulation range is wider, the stable operation of a thermal generator set is not influenced, the treatment cost is low, the drying treatment and energy storage of sludge can be realized, and the energy utilization rate is higher.
Preferably, the combustion power generation unit includes a utility boiler, a steam pipeline, a steam turbine and a generator which are connected in sequence in a steam flow direction.
Preferably, the sludge drying unit comprises a sludge drying device, a dried sludge conveying device and a dried sludge storage bin which are sequentially connected along the moving direction of the sludge.
Preferably, the incineration unit comprises a sludge blanking pipeline, an incinerator, a flue gas pipeline, a waste heat boiler and a waste heat steam pipeline which are connected in sequence.
Preferably, the outlet of the dried sludge storage bin is connected with the incinerator in the incineration unit through a sludge blanking pipeline.
Preferably, the outlet of the steam turbine is connected with a sludge drying device in the sludge drying unit through a steam extraction pipeline.
Preferably, the outlet of the sludge drying device is connected with the dried sludge storage bin through a dried sludge conveying device.
Preferably, the outlet of the incinerator is connected with a waste heat boiler through a flue gas pipeline.
Preferably, the outlet of the waste heat boiler is connected with the sludge drying device through a waste heat steam pipeline.
In a second aspect, the invention provides a method for peak shaving and sludge drying energy storage of a power station, wherein the method adopts the device system for peak shaving and sludge drying energy storage of the power station in the first aspect;
the method comprises the following steps:
(1) the fuel enters a combustion power generation unit to be combusted to generate steam, and the steam enters a steam turbine;
(2) directly applying work to part of steam in the steam turbine to generate mechanical energy, and generating electricity to generate electric power by the mechanical energy; the other part of steam and wet sludge in the steam turbine in the step (1) enter a sludge drying unit for drying treatment to generate dried sludge;
(3) and (3) the dried sludge obtained in the step (2) enters an incineration unit to be incinerated to generate flue gas, the working medium water and the flue gas enter a waste heat boiler to be subjected to waste heat recovery to generate waste heat steam, and the waste heat steam returns to the sludge drying unit to be dried.
According to the invention, one part of steam of the steam turbine is used for directly generating power, and the other part of excessive steam is used for drying wet sludge to obtain dried sludge, so that the power generation amount of the thermal power generator set can be reduced, and the peak regulation task is completed; and can realize sludge drying and redundant energy storage; the generated dried sludge is incinerated, and the waste heat generated by incineration generates steam again for drying treatment of wet sludge, so that the utilization rate of energy can be obviously improved.
As a preferred embodiment of the second aspect of the present invention, the method comprises the steps of:
(1) the fuel enters a power station boiler to be combusted to generate steam, and the steam enters a steam turbine through a steam pipeline;
(2) step (1), directly applying work to partial steam in the steam turbine to generate mechanical energy, and enabling the mechanical energy to enter a generator to generate electricity to generate electric power; the other part of steam in the steam turbine in the step (1) enters a sludge drying device through a steam extraction pipeline, and is dried together with wet sludge in the sludge drying device to obtain dried sludge;
(3) and (3) the dried sludge obtained in the step (2) enters a dried sludge storage bin through a dried sludge conveying device for storage, then enters an incinerator through a sludge blanking pipeline for incineration to generate flue gas, the flue gas enters a waste heat boiler through a flue gas pipeline, and is subjected to waste heat recovery with working medium water in the waste heat boiler to generate waste heat steam, and the waste heat steam returns to a sludge drying device to be dried with wet sludge.
Compared with the prior art, the invention has the following beneficial effects:
(1) the device system for peak regulation and sludge drying energy storage of the power station can store redundant energy of a thermal power generating unit by using a sludge drying process to finish peak regulation of the power station, has a wide peak regulation range, and cannot influence stable combustion of a boiler of the power station.
(2) The device system for peak shaving and sludge drying energy storage of the power station can be directly transformed on the original thermal power generation system, and compared with the existing sludge drying system and the existing electric peak shaving system, the device system has the advantages of reducing equipment investment, reducing construction cost and enabling the utilization rate of energy to be higher.
(3) The method for peak shaving and sludge drying energy storage of the power station, provided by the invention, is simple to operate, provides an optional way for a sludge drying steam source, and provides a feasible energy source for sludge drying.
Drawings
Fig. 1 is a schematic structural diagram of an apparatus system for power station peak shaving and sludge drying energy storage in embodiment 1 of the present invention.
Wherein, 1-a utility boiler; 2-a steam turbine; 3, a generator; 4-sludge drying device; 5-drying the sludge storage bin; 6-incinerator; 7-a waste heat boiler; 8-a steam pipeline; 9-a steam extraction pipeline; 10-a dried sludge conveying device; 11-a sludge blanking pipeline; 12-a flue gas duct; 13-residual heat steam pipeline.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a device system for peak shaving and sludge drying energy storage of a power station, as shown in fig. 1, the device system comprises a combustion power generation unit, a sludge drying unit and an incineration unit; an outlet of a steam turbine 2 in the combustion power generation unit is connected with a sludge drying unit; the outlet of the sludge drying unit is connected with the inlet of the incineration unit; an outlet of a waste heat boiler 7 in the incineration unit is circularly connected with the sludge drying unit;
the combustion power generation unit comprises a power station boiler 1, a steam pipeline 8, a steam turbine 2 and a power generator 3 which are sequentially connected along the steam flowing direction;
the sludge drying unit comprises a sludge drying device 4, a dried sludge conveying device 10 and a dried sludge storage bin 5 which are sequentially connected along the moving direction of sludge;
the incineration unit comprises a sludge blanking pipeline 11, an incinerator 6, a flue gas pipeline 12, a waste heat boiler 7 and a waste heat steam pipeline 13 which are connected in sequence;
the outlet of the dried sludge storage bin 5 is connected with an incinerator 6 in the incineration unit through a sludge blanking pipeline 11; the outlet of the steam turbine 2 is connected with a sludge drying device 4 in the sludge drying unit through a steam extraction pipeline 9; the outlet of the sludge drying device 4 is connected with a dried sludge storage bin 5 through a dried sludge conveying device 10; the outlet of the incinerator 6 is connected with a waste heat boiler 7 through a flue gas pipeline 12; and the outlet of the waste heat boiler 7 is connected with the sludge drying device 4 through a waste heat steam pipeline 13.
The embodiment also provides a method for peak shaving and sludge drying energy storage of the power station, which adopts the device system for peak shaving and sludge drying energy storage of the power station;
the method comprises the following steps:
(1) the fuel enters a power station boiler 1 to be combusted to generate steam, and the steam enters a steam turbine 2 through a steam pipeline 8;
(2) step (1), part of steam in the steam turbine 2 directly acts to generate mechanical energy, and the mechanical energy enters a generator 3 to generate electricity to generate electric power; the other part of steam in the steam turbine 2 in the step (1) enters a sludge drying device 4 through a steam extraction pipeline 9, and is dried together with wet sludge in the sludge drying device 4 to obtain dried sludge;
(3) and (3) the dried sludge obtained in the step (2) enters a dried sludge storage bin 5 through a dried sludge conveying device 10 for storage, then enters an incinerator 6 through a sludge blanking pipeline 11 for incineration to generate flue gas, the flue gas enters an exhaust-heat boiler 7 through a flue gas pipeline 12, and is subjected to waste heat recovery in the exhaust-heat boiler 7 together with working medium water to generate waste heat steam, and the waste heat steam returns to a sludge drying device 4 for drying treatment with wet sludge.
Comparative example 1
The present comparative example provides a coal-peaking power plant power generation system, in particular such as the one described in CN 206291201U.
Compared with the comparative example 1, in the example 1, the arrangement of equipment such as coal gas production equipment, coal gas production equipment pipelines and the like is saved, and the equipment cost and the raw material cost are saved. The embodiment 1 can further reduce the lower limit of peak shaving power generation power of the existing unit, does not affect the stable combustion of the power station boiler, realizes peak shaving of the power station, simultaneously stores redundant energy in the dried sludge, and can return heat generated by incineration of the dried sludge to the sludge drying treatment again. In the comparative example 1, the gas turbine or the gas engine is used for increasing the generated energy of the coal-fired unit, so that the aim of further reducing the stable combustion load of the conventional coal-fired unit cannot be fulfilled.
In conclusion, the device system and the method for peak regulation and sludge drying energy storage of the power station can store the redundant energy of the thermal power generating unit by using the sludge drying process to finish the peak regulation of the power station, and the peak regulation range is wide, so that the stable combustion of a power station boiler cannot be influenced.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The device system for peak shaving and sludge drying energy storage of the power station is characterized by comprising a combustion power generation unit, a sludge drying unit and an incineration unit;
an outlet of a steam turbine in the combustion power generation unit is connected with the sludge drying unit;
the outlet of the sludge drying unit is connected with the inlet of the incineration unit;
and the outlet of the waste heat boiler in the incineration unit is circularly connected with the sludge drying unit.
2. The plant system according to claim 1, wherein the combustion power generation unit comprises a utility boiler, a steam pipeline, a steam turbine and a power generator which are connected in sequence in a steam flow direction.
3. The device system of claim 1 or 2, wherein the sludge drying unit comprises a sludge drying device, a dried sludge conveying device and a dried sludge storage bin which are sequentially connected along the moving direction of the sludge.
4. The device system according to any one of claims 1 to 3, wherein the incineration unit comprises a sludge blanking pipeline, an incinerator, a flue gas pipeline, a waste heat boiler and a waste heat steam pipeline which are connected in sequence;
preferably, the outlet of the dried sludge storage bin is connected with the incinerator in the incineration unit through a sludge blanking pipeline.
5. The device system of claim 4, wherein the outlet of the steam turbine is connected with a sludge drying device in the sludge drying unit through a steam extraction pipeline.
6. The device system of claim 4 or 5, wherein the outlet of the sludge drying device is connected with the dried sludge storage bin through a dried sludge conveying device.
7. The apparatus system according to any one of claims 4 to 6, wherein the outlet of the incinerator is connected to a waste heat boiler via a flue gas duct.
8. The device system according to any one of claims 4 to 7, wherein the outlet of the waste heat boiler is connected with a sludge drying device through a waste heat steam pipeline.
9. A method for peak shaving and sludge drying energy storage in a power station, characterized in that the method employs the device system for peak shaving and sludge drying energy storage in a power station according to any one of claims 1-8;
the method comprises the following steps:
(1) the fuel enters a combustion power generation unit to be combusted to generate steam, and the steam enters a steam turbine;
(2) directly applying work to part of steam in the steam turbine to generate mechanical energy, and generating electricity to generate electric power by the mechanical energy; the other part of steam and wet sludge in the steam turbine in the step (1) enter a sludge drying unit for drying treatment to generate dried sludge;
(3) and (3) the dried sludge obtained in the step (2) enters an incineration unit to be incinerated to generate smoke, working medium water and the smoke enter a waste heat boiler to be subjected to waste heat recovery to generate waste heat steam, and the waste heat steam returns to the sludge drying unit to be dried.
10. Method according to claim 9, characterized in that it comprises the following steps:
(1) the fuel enters a power station boiler to be combusted to generate steam, and the steam enters a steam turbine through a steam pipeline;
(2) step (1), directly applying work to partial steam in the steam turbine to generate mechanical energy, and enabling the mechanical energy to enter a generator to generate electricity to generate electric power; the other part of steam in the steam turbine in the step (1) enters a sludge drying device through a steam extraction pipeline, and is dried together with wet sludge in the sludge drying device to obtain dried sludge;
(3) and (3) the dried sludge obtained in the step (2) enters a dried sludge storage bin through a dried sludge conveying device for storage, then enters an incinerator through a sludge blanking pipeline for incineration to generate flue gas, the flue gas enters a waste heat boiler through a flue gas pipeline, and is subjected to waste heat recovery with working medium water in the waste heat boiler to generate waste heat steam, and the waste heat steam returns to a sludge drying device to be dried with wet sludge.
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| CN202210160015.9A CN114542221A (en) | 2022-02-22 | 2022-02-22 | Device system and method for power station peak shaving and sludge drying energy storage |
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| CN202210160015.9A CN114542221A (en) | 2022-02-22 | 2022-02-22 | Device system and method for power station peak shaving and sludge drying energy storage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115853610A (en) * | 2023-03-03 | 2023-03-28 | 中国电力工程顾问集团有限公司 | Sludge drying coupling coal-fired unit frequency modulation and peak shaving system and method |
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