CN110220405A - Solid heat storage heat transfer control method based on Fourier number consistency - Google Patents
Solid heat storage heat transfer control method based on Fourier number consistency Download PDFInfo
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- CN110220405A CN110220405A CN201910426894.3A CN201910426894A CN110220405A CN 110220405 A CN110220405 A CN 110220405A CN 201910426894 A CN201910426894 A CN 201910426894A CN 110220405 A CN110220405 A CN 110220405A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D13/00—Electric heating systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D15/00—Other domestic- or space-heating systems
- F24D15/02—Other domestic- or space-heating systems consisting of self-contained heating units, e.g. storage heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1096—Arrangement or mounting of control or safety devices for electric heating systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0056—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using solid heat storage material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Central Heating Systems (AREA)
Abstract
Solid heat storage heat transfer control method based on Fourier number consistency is related to heat-accumulating heat-transfer and the latent heat releasing performance field of heat storage, is related to a kind of heat-accumulating heat-transfer control method of solid electricity heating combined equipment.The present invention provides a kind of solid heat storage heat transfer control method based on Fourier number consistency.The present invention the following steps are included: heat storage accumulation of heat rate (amount of stored heat in the unit time) are as follows:Q1=c × ρ × V (T2‑T1) T in formula1It DEG C is the temperature in regenerative apparatus, when the temperature of heat storage is stablized in set temperature, the intracorporal temperature equalization of regenerative furnace is set temperature T2℃.Magnesium grey iron block specific heat capacity c=1026J/ (kg DEG C), magnesium grey iron block density p=2800kg/m3, the volume of heat storage is V in solid heat storage device, and the amount of stored heat of entire heat storage is Q1。
Description
Technical field
The present invention relates to the heat-accumulating heat-transfer of heat storage and latent heat releasing performance field, it is related to a kind of solid electricity heating combined equipment
Heat-accumulating heat-transfer control method.
Background technique
Stage now, electric energy are a kind of using the higher energy, have transmission convenience, using flexible, no pollution to the environment
The advantages that, it has unrivaled superiority using upper in the energy, especially in terms of heating, heating, the advantages of electric energy
It is extremely obvious.Wherein energy storage technology has extraordinary wind-electricity complementary, attracts extensive attention on improving wind-powered electricity generation networking scale.
New mechanism is shared for the peak regulation ancillary service that electric energy storage participates in gradually is established by China, gives full play to electric energy storage technology in power peak regulation
The advantage of aspect, electric energy storing system can also be imitated while obtaining the ancillary services identity such as participation peak load regulation network by application
Fruit obtains due income.The mode of " electricity determining by heat " is taken in the operation of steam power plant, if not increasing energy storage device, steam power plant's root
Its generated energy is determined according to heating load, and after increasing energy storage facility, power plant can store electric energy in the case where not load shedding
At thermal energy, it is re-used as thermal energy supply heat supply network in other periods, realizes the conversion of electric energy.It is the important way for improving energy utilization rate
One of diameter, therefore solid thermal storage heating has broad application prospects.
The development of energy storage technology is grown up along with the problem of electric power industry development.Currently, domestic
Outer experts and scholars mainly pay attention to the influence of storage heater heat charge and discharge and heat transfer property, packet to the research of storage heater structure
Include the factors such as arrangement mode and the heat storage caliber of heat storage.
Published by Chinese Water Conservancy water power publishing house in December, 2018, Ge Weichun, Xing Zuoxia, Zhu Jian are new etc. write " Gu
Body electric heat storage and new energy dissolve technology ", it is related to a kind of solid electric heat-storage device, as shown in Figure 1, the solid electric heat-storage device
Main body be heat storage；Heat exchanger, the auxiliary device of the constituent apparatus such as centrifugal blower.
Solid heat storage device converts electrical energy into thermal energy using resistance heating manner, is changed by radiation heat transfer, convection current
Hot mode is heat transfer and stores into heat accumulating, will by heat convection mode when needing using this partial heat
Air heating, air flow through vapor-water heat exchanger and supply thermal energy to heating system.
Solid heat collecting system is by following system unit: heat storage, heating system, heat-exchange system, wind cyclic control system, outer
The compositions such as the attached circulatory system of portion's heat exchange.
The accumulation of heat circulatory system is by regenerative structure body (including accumulation of heat module and built-in type heater strip), heat exchange cycle system (packet
Include heat exchanger and frequency conversion fan), insulation shell, the structures such as external control constitute.
The insulating layer of device is made of ceramic fiber blanket, rock wool etc., and heat is stored in heat storage, this is accumulation of heat.
When needing heat release, air can be made in device along the intracorporal ventilation hole recycle stream of accumulation of heat by centrifugal induced draught fan
Dynamic, heat enters circulation supply heat user and uses.Circulating water temperature control is the work shape by adjusting centrifugal induced draught fan
What state was realized.
The present invention provides a kind of solid heat storage heat transfer controlling party based on Fourier number consistency for above-mentioned regenerative apparatus
Method.
Summary of the invention
The present invention addresses the above problem, provides a kind of solid heat storage heat transfer controlling party based on Fourier number consistency
Method.
To achieve the above object, the present invention adopts the following technical scheme that, the present invention the following steps are included:
The accumulation of heat rate (amount of stored heat in the unit time) of heat storage are as follows:
Q1=c × ρ × V (T2-T1)
T in formula1It DEG C is the temperature in regenerative apparatus, when the temperature of heat storage is stablized in set temperature, in regenerative furnace body
Temperature equalization be set temperature T2℃.Magnesium grey iron block specific heat capacity c=1026J/ (kg DEG C), magnesium grey iron block density p=2800kg/m3,
The volume of heat storage is V in solid heat storage device, and the amount of stored heat of entire heat storage is Q1
The heat release rate (amount of stored heat in the unit time) of heat storage are as follows:
The heat release amount of heat storage unit area:
It is to single layer furnace wall heat release amount:
In formula: Q --- heat storage heat flow rate per unit area, kJ；Δ T --- the temperature difference in accumulation of heat body heat face and surface, DEG C；
The thermal coefficient of k --- material, W/m DEG C；The thickness of δ --- material；
Fourier number is the ratio of heat release rate and accumulation of heat rate, i.e.,For the time of zero dimension.
When temperature difference occurs in interior of articles, heat is partially transferred to the lower part of temperature from temperature is higher；Temperature is not
With object between contact with each other when, heat is by the object transfer from the object of high temperature to low temperature.It is fixed that heat transfer follows Fourier
Rule:
Q "=- k (dT/dx)
It " is heat flow density, W/m in formula: q2；K is thermal coefficient, W/ (m DEG C).
As a preferred embodiment, the heat transfer method calculates, and air is flowed (as shown in Figure 1, hot wind-is cold
The process of wind) and accumulation of heat body region use direct fluid-wall interaction mode.It converts the heat convection condition on Liquid-solid interface to
The inner boundary of system, solid heat transfer are coupled with fluid heat transferring, obtain fluid flow fields and solid and fluid temperature field.
Beneficial effect of the present invention.
The present invention is based on the solid heat storage of Fourier number consistency heat transfer control method, the ratios of heat release rate and accumulation of heat rate
Value and Fourier number are with uniformity, it may be determined thatAnd then amount of stored heat is defined, and then the parameter of heat storage is set；
Significantly improve heat storage design efficiency and accuracy.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawings and detailed description.The scope of the present invention not only limits to
In the statement of the following contents.
Fig. 1 is heat storage body structure.
Fig. 2 is regenerator temperature field.
Fig. 3 heat storage interior flow field.
Specific embodiment
As shown, heat user partially or mostly uses low ebb by the hot water heating in heat exchanger, to realize entirely
The purpose of electric heating.
Experiment carries out on certain 1000kWh solid heat storage device.The device is by accumulation of heat, heat exchange, the circulatory system, computer heating control
Deng four most of compositions.Using heater strip as heat source, with heat-accumulating magnesia material, using air as heat-transfer fluid.When experiment first
The power supply for connecting heater strip, adjusts preset temperature, starts to heat device.After device is powered, in ventilation hole
Heater strip starts to transfer heat to accumulation of heat brick body, and after heat storage reaches set temperature, temperature sensor (is placed on heat storage
In longitudinal said minuscule hole) signal passed into control system, control system control device stops heating.During heating, often
10min reads a temperature data.When the temperature in device reaches 1000K, then stop heating, it is complete in entire heating process
Speed is all controlled by temperature control instrument.The experimental data of solid heat storage device arrange, summarize and calculate, has been calculated every
Average value of a measuring point temperature in measuring section, compares with heat storage mean temperature in numerical simulation.
The key that fluid-solid conjugated heat transfer calculates is the heat transfer realized at fluid and solid or boundary wall surface.It is kept by energy
For perseverance it is found that in fluid structurecoupling interface, the heat of solid sorbent should be equal to the heat of fluid loss.
Tf=Ts
In formula: TfAnd kfRespectively fluid temperature (F.T.) and thermal coefficient；TsAnd ksRespectively solid temperature and thermal coefficient；qfWith
qsGu respectively flowing the-heat flow density on interface upstream side and solid side；Gu n is stream-interface normal vector.
Above-mentioned boundary condition includes the value of flow variables and hot change amount in boundary.When accumulation of heat: the total work of electric heating wire
Rate is 250kW, absorption coefficient 0.7.To prevent electric heating wire from overheating, it is passed through air to heat storage, entrance is speed entrance,
Air intake speed is 0.01m/s, and temperature is determined according to field data fitting function.The interface of fluid mass and solid domain is set
For coupled interface.Fluid outlet is set as pressure export, and wall surface is set as insulation without slip boundary condition.Time step is 10, total to add
The hot time is 24000s.
Each section material property and boundary condition of fluid-structure coupling system are applied on numerical simulator, after calculating convergence
Temperature field and flow field of the obtained solid electric heat-storage device fluid-structure coupling system under accumulation of heat operating condition.
Simulation calculation is carried out to solid heat storage device using the heat transfer model of fluid structurecoupling, according to the calculated result,
The void ratio of Preliminary design is respectively that (void ratio refers in heat storage cross section for 15%, 20%, 25% three kinds of heat storage body structures
It is interior, the ratio between hole area and entity area.In a section, an area of hole is multiplied by hole number, divided by this section
Entity area, just obtain void ratio), optimize and analyze.Pass through the heat storage accumulation of heat operating condition to three kinds of void ratios
When heat storage mean temperature and heater strip temperature compare and analyze；When by heat storage heat release operating condition to three kinds of void ratios
The comparative analysis of heat storage mean temperature, comprehensive accumulation of heat and heat release operating condition, the structure of void ratio 20% are optimal.
Void ratio and amount of stored heat have corresponding relationship, according to the present invention the solid heat storage Heat Transfer Optimization of Fourier number consistency
Design method determines amount of stored heat, and then determines optimal void ratio.
As shown in Figure 1, lateral brick two sides are vertical brick up and down, it is a hole between two vertical bricks.
The size of brick can be used 230mm × 115mm × 50mm (length × width × height), and heat storage capacity is 1000kWh, power
250kW.The overall dimension of heat storage can be 1500mm × 2080mm × 3250mm (length × width × height), regenerative apparatus contour dimension
Can be 3500mm × 2300mm × 1500mm (length × width × height).The heat storage void ratio (in heat storage cross section, hole face
It is long-pending the ratio between with entity area) be 15%, hole number 72, single hole sectional area 130mm × 40mm, heater strip quantity 36.
| Void ratio (%) | Hole number | Heat storage size (mm) | Pore-size (mm) |
| 15 | 72 | 1500×2080×3250 | 130×40×3250 |
| 20 | 72 | 1500×2080×3250 | 130×60×3250 |
| 25 | 72 | 1630×2080×3250 | 210×40×3250 |
It is understood that being merely to illustrate the present invention above with respect to specific descriptions of the invention and being not limited to this
Technical solution described in inventive embodiments, those skilled in the art should understand that, still the present invention can be carried out
Modification or equivalent replacement, to reach identical technical effect；As long as meet use needs, all protection scope of the present invention it
It is interior.
Claims (2)
- The control method 1. solid heat storage based on Fourier number consistency conducts heat, it is characterised in that the following steps are included:The accumulation of heat rate (amount of stored heat in the unit time) of heat storage are as follows:Q1=c × ρ × V (T2-T1)T in formula1It DEG C is the temperature in regenerative apparatus, when the temperature of heat storage stablizes the intracorporal temperature of regenerative furnace in set temperature Equilibrium is set temperature T2℃.Magnesium grey iron block specific heat capacity c=1026J/ (kg DEG C), magnesium grey iron block density p=2800kg/m3, solid storage The volume of heat storage is V in thermal, and the amount of stored heat of entire heat storage is Q1The heat release rate (amount of stored heat in the unit time) of heat storage are as follows:The heat release amount of heat storage unit area:It is to single layer furnace wall heat release amount:In formula: Q --- heat storage heat flow rate per unit area, kJ；Δ T --- the temperature difference in accumulation of heat body heat face and surface, DEG C； The thermal coefficient of k --- material, W/m DEG C；The thickness of δ --- material；Fourier number is the ratio of heat release rate and accumulation of heat rate, i.e.,For the time of zero dimension.When temperature difference occurs in interior of articles, heat is partially transferred to the lower part of temperature from temperature is higher；Temperature is different When contacting with each other between object, heat is by the object transfer from the object of high temperature to low temperature.Heat transfer follows Fourier's law:Q "=- k (dT/dx)It " is heat flow density, W/m in formula: q2；K is thermal coefficient, W/ (m DEG C).
- 2. the solid heat storage heat transfer control method based on Fourier number consistency according to claim 1, it is characterised in that institute The heat transfer method stated calculates, and uses direct fluid-wall interaction mode for air flowing and accumulation of heat body region；By Liquid-solid interface On heat convection condition be converted into the inner boundary of system, solid heat transfer is coupled with fluid heat transferring, obtain fluid flow fields and Solid and fluid temperature field.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111608753A (en) * | 2020-04-28 | 2020-09-01 | 沈阳工业大学 | Peak regulation system of combined solid electric heat storage device for high-low bypass modification of cogeneration unit |
| CN112648787A (en) * | 2019-10-10 | 2021-04-13 | 中车石家庄车辆有限公司 | Method and device for determining cold accumulation residual service life and computer equipment |
| CN112902720A (en) * | 2020-12-31 | 2021-06-04 | 中国航天空气动力技术研究院 | Design method of heat accumulator of ceramic hollow brick heat accumulator |
| CN113063176A (en) * | 2021-04-21 | 2021-07-02 | 上海理工大学 | Adjustable heat storage-heat dissipation composite device |
| CN114659399A (en) * | 2022-04-13 | 2022-06-24 | 哈尔滨工业大学 | Thermal shock resistance solid heat storage device |
| WO2023174911A1 (en) * | 2022-03-14 | 2023-09-21 | Timothy Patrick Cooper | Thermal energy storage system |
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| CN112902720B (en) * | 2020-12-31 | 2022-07-05 | 中国航天空气动力技术研究院 | Design method of heat accumulator of ceramic hollow brick heat accumulator |
| CN113063176A (en) * | 2021-04-21 | 2021-07-02 | 上海理工大学 | Adjustable heat storage-heat dissipation composite device |
| CN113063176B (en) * | 2021-04-21 | 2022-07-29 | 上海理工大学 | Adjustable heat storage-heat dissipation composite device |
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| CN114659399A (en) * | 2022-04-13 | 2022-06-24 | 哈尔滨工业大学 | Thermal shock resistance solid heat storage device |
| CN114659399B (en) * | 2022-04-13 | 2024-03-26 | 哈尔滨工业大学 | thermal shock resistance solid heat storage device |
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