CN110567027B - System for coupling sludge incinerator and heat supply unit - Google Patents

System for coupling sludge incinerator and heat supply unit Download PDF

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Publication number
CN110567027B
CN110567027B CN201910761914.2A CN201910761914A CN110567027B CN 110567027 B CN110567027 B CN 110567027B CN 201910761914 A CN201910761914 A CN 201910761914A CN 110567027 B CN110567027 B CN 110567027B
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China
Prior art keywords
steam
heat supply
sludge incinerator
auxiliary
sludge
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CN201910761914.2A
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CN110567027A (en
Inventor
石韬
吴阿峰
李伟科
霍沛强
樊晓茹
张翔宇
韩卫冬
王钦
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China Energy Engineering Group Guangdong Electric Power Design Institute Co Ltd
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China Energy Engineering Group Guangdong Electric Power Design Institute Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K17/00Using steam or condensate extracted or exhausted from steam engine plant
    • F01K17/02Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44Details; Accessories
    • F23G5/46Recuperation of heat
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/001Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D12/00Other central heating systems
    • F24D12/02Other central heating systems having more than one heat source
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00Details
    • F24D19/10Arrangement or mounting of control or safety devices
    • F24D19/1003Arrangement or mounting of control or safety devices for steam heating systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00Heat sources or energy sources
    • F24D2200/16Waste heat
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/12Heat utilisation in combustion or incineration of waste

Abstract

The invention discloses a system for coupling a sludge incinerator and a heat supply unit, which comprises a sludge incinerator main steam system, an external heat supply system and an original unit auxiliary steam system; a steam outlet of the main steam system of the sludge incinerator is respectively connected with a first steam inlet of the external heat supply system and a steam inlet of the original unit auxiliary steam system, and a steam outlet of the original unit auxiliary steam system is connected with a second steam inlet of the external heat supply system; the sludge incinerator main steam system is used for conveying steam to the external heat supply system according to preset heat supply steam consumption. The sludge incinerator is coupled with the heat supply system of the coal-fired unit, so that the sludge incinerator can operate at a stable load for a long time, the rated sludge consumption can be ensured, and both sludge incineration and external heat supply are realized.

Description

System for coupling sludge incinerator and heat supply unit
Technical Field
The invention relates to the technical field of energy conservation and emission reduction, in particular to a system for coupling a sludge incinerator and a heat supply unit.
Background
Sludge incineration is the mainstream sludge treatment scheme at present. The sludge incinerator is mainly fluidized bed (CFB or BFB). Due to the limitation of the calorific value of the sludge and the influence of the furnace type, the medium-sized coal-fired unit with large main steam parameters at the outlet of the sludge incinerator is generally low, so that the sludge incinerator is generally not recommended to be provided with a steam turbine power generation system independently. The conventional technical scheme is that main steam at the outlet of the sludge incinerator is coupled with a thermodynamic system of an original coal-fired unit of a power plant, an appropriate coupling point is selected to be connected into the thermodynamic system of the original unit according to main steam parameters, and the main steam and reheated steam of the original boiler enter a low-pressure cylinder in a steam turbine to do work. So as to improve the overall efficiency of the unit as much as possible on the premise of saving investment.
However, in general, a sludge incinerator is normally under a rated load for a long period of time in order to ensure a rated consumption of sludge. The load of the original coal-fired unit coupled with the coal-fired unit can change at any time due to the influence of the power grid dispatching. When the load of the original coal-fired unit is reduced, the proportion of the main steam of the sludge incinerator in a thermodynamic system of the coal-fired unit is rapidly increased, and the impact on the heating surface of the boiler of the original unit and the cylinder body of the steam turbine is possibly caused, so that potential safety hazards are brought.
Taking an incinerator with sludge incineration amount of 250 t/day as an example, the steam parameters are generally 4.0MPa-5.0MPa and 400-550 ℃. The parameters are mainly similar to the thermal parameters of a reheating steam pipeline of a coal-fired unit, so that the main steam parameters of the existing sludge incinerator are generally coupled with a reheating system of an original unit, and the generating capacity of the unit is improved by increasing the steam quantity of the original unit. The outlet steam of the sludge incinerator is coupled with the steam side of the original unit, and the main steam parameters of the sludge incinerator are matched with the hot section reheating steam parameters or the cold section reheating steam parameters. When the cold section reheating pipeline is connected, the steam quantity of the sludge incinerator is limited by the area allowance of the original boiler hearth reheater, and if the allowance is insufficient, the steam-water power safety is influenced. Even if the boiler is connected to a hot end reheating pipeline, the proportion of steam parameters of the sludge incinerator is increased along with the reduction of the load of a raw coal powder boiler, and the strength and the axial thrust of a high-medium pressure cylinder are easy to exceed the standard. If the original unit has no allowable equipment capacity, the safety of the unit operation needs to be ensured by reducing the output of the sludge incinerator, so that the rated treatment capacity of the sludge cannot be ensured.
In summary, in the existing system for coupling the sludge incinerator and the thermodynamic system of the original coal-fired unit, when the power demand of the generator set is reduced due to the influence of power grid dispatching, the proportion of the coupled steam can be reduced only by reducing the fuel quantity of the sludge incinerator, so that the consumption of the sludge is reduced, namely the consumption of the sludge is indirectly influenced by the load of the original coal-fired unit. Therefore, the mode of coupling the sludge incinerator with the thermodynamic system of the original coal-fired unit in the prior art has certain limitation.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a system for coupling a sludge incinerator and a heat supply unit, wherein the sludge incinerator can be operated with a stable load for a long time by coupling the sludge incinerator and a heat supply system of a coal-fired unit, so that a rated sludge consumption can be ensured.
In order to solve the technical problem, the embodiment of the invention provides a system for coupling a sludge incinerator and a heat supply unit, which comprises a sludge incinerator main steam system, an external heat supply system and an original unit auxiliary steam system;
a steam outlet of the main steam system of the sludge incinerator is respectively connected with a first steam inlet of the external heat supply system and a steam inlet of the original unit auxiliary steam system, and a steam outlet of the original unit auxiliary steam system is connected with a second steam inlet of the external heat supply system;
the sludge incinerator main steam system is used for conveying steam to the external heat supply system according to preset heat supply steam consumption;
when the steam supply amount of the sludge incinerator main steam system is smaller than the preset steam supply amount for heat supply, the original unit auxiliary steam system is used for conveying the steam supply amount to the external heat supply system, wherein the steam supply amount is the difference value between the preset steam supply amount for heat supply and the steam supply amount of the sludge incinerator main steam system.
Further, the system for coupling the sludge incinerator and the heat supply unit further comprises an auxiliary steam supply small machine pipeline, and the auxiliary steam supply small machine pipeline is used for absorbing the surplus steam of the coupled system.
Further, the primary unit auxiliary steam system comprises an auxiliary steam main pipe, a cold section reheating pipeline and a steam turbine four-section steam extraction pipeline, and the primary unit auxiliary steam system maintains the steam volume balance of the auxiliary steam main pipe by adjusting the steam extraction volume of the cold section reheating pipeline and/or the steam turbine four-section steam extraction pipeline.
Further, the system for coupling the sludge incinerator and the heat supply unit further comprises at least one temperature and pressure reducing device, and the temperature and pressure reducing device is used for reducing the temperature and the pressure of steam at the outlet of the main steam system of the sludge incinerator.
Further, the system for coupling the sludge incinerator and the heat supply unit further comprises at least one electric shutoff valve, at least one safety valve and at least one flow meter, wherein the electric shutoff valve is used for controlling the on-off of steam in the pipeline, the safety valve is used for preventing the steam pressure in the pipeline from exceeding a specified value, and the flow meter is used for measuring the steam flow in the pipeline.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a system for coupling a sludge incinerator and a heat supply unit, wherein the sludge incinerator is coupled with the heat supply system and an auxiliary steam system by adjusting the design parameter of main steam at an outlet, so that the matching of the main steam consumption and the external heat supply parameter is realized, and the peak regulation is performed by using the auxiliary steam system of the original unit, so that the sludge incinerator can operate at a stable load for a long time, the rated sludge consumption can be ensured, and the sludge incineration and the external heat supply are not mistaken.
Drawings
Fig. 1 is a schematic structural diagram of a system in which a sludge incinerator is coupled to a heating unit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a system for coupling a sludge incinerator and a heat supply unit, including a sludge incinerator main steam system, an external heat supply system, and an original unit auxiliary steam system;
a steam outlet of the main steam system of the sludge incinerator is respectively connected with a first steam inlet of the external heat supply system and a steam inlet of the original unit auxiliary steam system, and a steam outlet of the original unit auxiliary steam system is connected with a second steam inlet of the external heat supply system;
the sludge incinerator main steam system is used for conveying steam to the external heat supply system according to preset heat supply steam consumption;
when the steam supply amount of the sludge incinerator main steam system is smaller than the preset steam supply amount for heat supply, the original unit auxiliary steam system is used for conveying the steam supply amount to the external heat supply system, wherein the steam supply amount is the difference value between the preset steam supply amount for heat supply and the steam supply amount of the sludge incinerator main steam system.
The main idea of the invention is to use the main steam at the outlet of the sludge incineration boiler as a stable steam source of a heat supply network, and the auxiliary steam of the original coal-fired unit as peak shaving steam of the heat supply network for standby. The stable load of the sludge incinerator is ensured by utilizing the stable steam consumption of the heat supply network, so that the rated consumption of the sludge is ensured.
In the embodiment of the invention, further, the system for coupling the sludge incinerator and the heat supply unit further comprises an auxiliary steam supply small machine pipeline, and the auxiliary steam supply small machine pipeline is used for absorbing the surplus steam of the coupled system. It can be understood that when the steam supply amount of the sludge incinerator main steam system is greater than the preset heat supply steam amount, the surplus steam amount can be coupled to an auxiliary steam main pipe (used for driving a steam feed water pump) of the original coal-fired unit. The original auxiliary steam is from the steam extraction of the steam turbine of the coal-fired unit, and after surplus steam of the incinerator comes, the steam extraction of the steam turbine of the original coal-fired unit can be reduced.
In an embodiment of the present invention, further, the primary unit auxiliary steam system includes an auxiliary steam main pipe, a cold section reheating pipeline, and a steam turbine four-section steam extraction pipeline, and the primary unit auxiliary steam system maintains the steam volume balance of the auxiliary steam main pipe by adjusting the steam extraction volume of the cold section reheating pipeline and/or the steam turbine four-section steam extraction pipeline.
In an embodiment of the present invention, further, the system in which the sludge incinerator is coupled to the heat supply unit further includes at least one temperature and pressure reducing device, and the temperature and pressure reducing device is used for reducing the temperature and pressure of the steam at the outlet of the sludge incinerator main steam system.
In an embodiment of the present invention, the system for coupling the sludge incinerator and the heat supply unit further includes at least one electric shutoff valve, at least one safety valve and at least one flow meter, wherein the electric shutoff valve is used for controlling the steam on-off of the pipeline, the safety valve is used for preventing the steam pressure in the pipeline from exceeding a specified value, and the flow meter is used for measuring the steam flow in the pipeline.
In the embodiment of the invention, firstly, the steam parameters at the outlet of the sludge incinerator are adjusted to be close to the auxiliary steam parameters of the whole original unit, after the temperature and pressure reduction measures are taken, one path is connected to an external heat supply system, and the other path is connected to an auxiliary steam main pipe of the original unit. Under the normal operation condition of the unit, the main steam of the sludge incinerator is used as a stable steam source point of a heat supply network, and the auxiliary steam of the original unit is used as a peak regulation heat source.
Specifically, when the rated main steam quantity of the incinerator is less than the steam quantity of a steam point for heat supply, the insufficient steam quantity is provided by an auxiliary steam main pipe of the original unit; when the rated main steam quantity of the incinerator is larger than the steam quantity of the steam point for heat supply, the surplus steam quantity is coupled to the original unit auxiliary steam system. The original auxiliary steam system maintains the steam quantity balance of the auxiliary steam main pipe by adjusting the steam extraction quantity of the four-extraction pipeline or the cold section reheating pipeline, and ensures the heat demand of a heat supply and heat supply network. Generally speaking, for the interior of a thermodynamic system of an original coal-fired unit (without considering external heat supply), the maximum steam consumption of auxiliary steam comes from a water-feeding pump steam turbine, therefore, when main steam of an incinerator is coupled into an auxiliary steam system, a steam extraction steam source of the water-feeding pump steam turbine is switched to auxiliary steam for steam supply, and the newly added coupled steam is preferentially used as a steam source of the water-feeding pump steam turbine, so that the steam extraction quantity of the original unit is reduced.
It is understood that in particular embodiments, the auxiliary steam header may be used as a steam source for a steam feed pump (if the project has a steam feed pump), as a fuel line steam purge heat source, a fuel line keep warm heat source (northern areas), and the like.
It should be noted that, the original auxiliary steam system maintains the steam quantity balance of the auxiliary steam main pipe by adjusting the steam extraction quantity of the four-extraction pipeline or the cold section reheating pipeline, and ensures the heat demand of the heat supply and heat supply network. Because the auxiliary steam quantity of the unit is constant, when the main steam of the CFB incinerator enters the auxiliary steam system, the conventional four-section steam extraction quantity is reduced so as to keep the steam quantity balance of the auxiliary steam main pipe, and vice versa; and a temperature and pressure measuring point is arranged on the auxiliary steam main pipe to realize feedback.
Because the four-section extraction steam of the steam turbine is mainly a main steam source of an auxiliary steam main pipe and is also a main steam source of a steam-driven water-feeding pump (if the steam-driven water-feeding pump exists); however, in some projects, it is also attempted to directly supply the steam feed pump with auxiliary steam (since the auxiliary steam is also from the four-stage extraction, the parameters are almost the same). Therefore, in fig. 1, there are two branch pipes, which are collected to a main pipe (the steam feed pump usually has only one steam inlet) and enter the steam feed pump (under normal operation, the branch pipe is opened by one way, either four-section steam extraction or auxiliary steam extraction).
Compared with the prior art, the coupling system provided by the embodiment of the invention has the following advantages:
firstly, the problem of the consumption of the main steam of the incinerator can be solved, the influence degree of the load change of the original unit is greatly reduced, and the stable sludge treatment capacity is effectively guaranteed;
compared with the heat supply of the original unit, the scheme equivalently reduces the steam extraction amount of the unit, and the economical efficiency is obviously improved;
thirdly, the main steam of most of the sludge incinerators is coupled into a heat supply network system, the proportion of the main steam coupled into the original auxiliary steam system is correspondingly reduced, the impact on the original unit is also correspondingly reduced, and the main steam is mainly in a low-pressure cylinder, so that the safety of the unit is greatly improved;
and fourthly, the heat supply load of the external heat supply network is matched with the incinerator and the original unit, and the incinerator and the original unit can realize mutual standby of the heat supply network, so that the overall stability of the system is effectively improved.
It should be noted that, the embodiment of the present invention is mainly designed and described with respect to a sludge incinerator (fuel amount is calculated by 250 t/day of absolutely dry sludge), but the present invention is not limited thereto, and the core idea of the present invention is applicable to other fuels (such as garbage, biomass, and other fuels), and other types of furnaces (such as CFB, BFB, and the like), and is not exhaustive herein.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (3)

1. A system for coupling a sludge incinerator and a heat supply unit is characterized by comprising a sludge incinerator main steam system, an external heat supply system, an original unit auxiliary steam system and an auxiliary steam supply small machine pipeline;
a steam outlet of the main steam system of the sludge incinerator is respectively connected with a first steam inlet of the external heat supply system and a steam inlet of the original unit auxiliary steam system, and a steam outlet of the original unit auxiliary steam system is connected with a second steam inlet of the external heat supply system;
the sludge incinerator main steam system is used for conveying steam to the external heat supply system according to preset heat supply steam consumption;
when the steam supply amount of the sludge incinerator main steam system is smaller than the preset steam supply amount for heat supply, the original unit auxiliary steam system is used for conveying the steam supply amount to the external heat supply system, wherein the steam supply amount is the difference value between the preset steam supply amount for heat supply and the steam supply amount of the sludge incinerator main steam system;
the auxiliary steam supply small machine pipeline is used for absorbing the surplus steam of the coupled system;
the original unit auxiliary steam system comprises an auxiliary steam main pipe, a cold section reheating pipeline and a steam turbine four-section steam extraction pipeline, and the original unit auxiliary steam system maintains the steam quantity balance of the auxiliary steam main pipe by adjusting the steam extraction quantity of the cold section reheating pipeline and/or the steam turbine four-section steam extraction pipeline.
2. The system of coupling a sludge incinerator and a heat supply unit as claimed in claim 1, wherein the system of coupling the sludge incinerator and the heat supply unit further comprises at least one temperature and pressure reducing device for reducing temperature and pressure of outlet steam of the sludge incinerator main steam system.
3. The system of claim 1, further comprising at least one electrically-operated shutoff valve for controlling the opening and closing of the steam in the pipe, at least one safety valve for preventing the steam pressure in the pipe from exceeding a predetermined value, and at least one flow meter for measuring the steam flow in the pipe.
CN201910761914.2A 2019-08-16 2019-08-16 System for coupling sludge incinerator and heat supply unit Active CN110567027B (en)

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CN111853739B (en) * 2020-08-14 2022-03-04 中国能源建设集团广东省电力设计研究院有限公司 Sludge and fire coal integrated processing system based on steam-water coupling
CN114934817B (en) * 2022-04-28 2023-11-17 中国电建集团华东勘测设计研究院有限公司 Shaft seal steam supply system of middle-low pressure cylinder type steam turbine and operation method

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CN104016564A (en) * 2014-06-23 2014-09-03 王子国 Sludge multi-effect drying incineration treatment system and application method thereof
CN205842823U (en) * 2016-06-28 2016-12-28 陕西华电瑶池发电有限公司 Heating system in a kind of factory utilizing power plant exhaust steam residual heat
CN206739422U (en) * 2017-05-04 2017-12-12 湖南佰霖生物技术股份有限公司 A kind of sludge incineration heating plant
CN107860153A (en) * 2017-11-15 2018-03-30 中国大唐集团科学技术研究院有限公司西北分公司 A kind of energy-saving and water-saving type coal-burning boiler wet flue gas depth total system and method
CN208606248U (en) * 2018-02-24 2019-03-15 焦作煤业(集团)有限责任公司电冶分公司 Thermal power plant's steam heating system
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CN109631132A (en) * 2018-12-20 2019-04-16 重庆樱花能源科技有限公司 Load self-adapting combined heating system and heating method

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