CN109684728A - A kind of graphite electric induction heater high temperature curve realization device and implementation method - Google Patents
A kind of graphite electric induction heater high temperature curve realization device and implementation method Download PDFInfo
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- H—ELECTRICITY
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- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
- H05B3/145—Carbon only, e.g. carbon black, graphite
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Abstract
A kind of graphite electric induction heater high temperature curve realization device and implementation method, are related to inert gas heating art；Including n graphite regenerative block, bottom support plate, circumferential insulating layer, shell, induction coil and top insulating layer；Wherein, shell is the hollow columnar structures placed vertically；Bottom support plate lies in a horizontal plane in bottom in shell；N graphite regenerative block is successively placed next to each other in vertically at the axle center of bottom support plate upper surface；Circumferential insulating layer is sleeved on the outer wall of n graphite regenerative block；Induction coil is sleeved on the side wall on circumferential insulating layer top；Top insulating layer is fixed at the top of circumferential insulating layer；And top insulating layer stretches out shell；N is positive integer, and n is more than or equal to 5；The present invention solves the problems, such as that graphite material axial thermal conductivity coefficient is excessively high and leads to not realize axial high-temperature gradient curve, makes to can be realized axial specific high temperature curve after the completion of the preheating of graphite electric induction heater, breaks through graphite electric induction heater preheating technology.
Description
Technical field
The present invention relates to a kind of inert gas heating art, especially a kind of graphite electric induction heater is real with high temperature curve
Existing device and implementation method.
Background technique
At present mainly using graphite electric induction heater for the heating of the inert gases such as nitrogen, graphite electric induction heater work
Make process are as follows: the first step loads intermediate frequency or high-frequency alternating current by induction coil, heats graphite regenerative block in advance；Second step, from
Air inlet is passed through the inert gases such as nitrogen, successively by venthole, the air-flow through-hole etc. of bottom support, forms high temperature in exit
Air-flow, air-flow are heated when storing block interior air-flow through-hole by pyrographite.
Graphite electric induction heater is during second step ventilates heated nitrogen, in the impact of strong cold airflow, due to graphite
The strength of materials is limited, and graphite regenerative block of the cold air after high temperature preheating generates big impact thermal stress, and heater is caused to exist by force
The lower damage of cold airflow impact.This causes domestic existing graphite induction heater to be generally only capable of for gas flow temperature being heated to lower model
It encloses, typically up to up to 750K
High temperature curve requirement graphite material axial thermal conductivity coefficient is lower, and radially and circumferentially thermal coefficient is sufficiently large, due to state
Interior to lack anisotropic large scale high strength graphite material, domestic graphite material technology is difficult to meet high temperature curve requirement,
Using high thermal conductivity coefficient graphite material and by electric induction mode, the domestic industry processing method temperature difference is generally no greater than 100K.
Summary of the invention
It is an object of the invention to overcome the above-mentioned deficiency of the prior art, a kind of graphite electric induction heater high temperature is provided
Curve realization device and implementation method, solve that graphite material axial thermal conductivity coefficient is excessively high to lead to not to realize axial high-temperature ladder
Write music line the problem of, make to can be realized axial specific high temperature curve after the completion of the preheating of graphite electric induction heater, break through graphite electricity
Induction heater preheating technology.
Above-mentioned purpose of the invention is achieved by following technical solution:
A kind of graphite electric induction heater high temperature curve realization device, including n graphite regenerative block, bottom support plate,
Circumferential insulating layer, shell, induction coil and top insulating layer；Wherein, shell is the hollow columnar structures placed vertically；Bottom branch
Fagging lies in a horizontal plane in bottom in shell；N graphite regenerative block is successively placed next to each other in the axis of bottom support plate upper surface vertically
At the heart；Circumferential insulating layer is sleeved on the outer wall of n graphite regenerative block；Induction coil is sleeved on the side wall on circumferential insulating layer top；
Top insulating layer is fixed at the top of circumferential insulating layer；And top insulating layer stretches out shell；N is positive integer, and n is greater than etc.
In 5.
In a kind of above-mentioned graphite electric induction heater high temperature curve realization device, the axial bottom end of shell be provided with into
Port；Top insulating layer is provided with gas outlet；Bottom support plate is provided with air hole；Air hole is located at the following table of graphite regenerative block
Face；It is realized by induction coil and the corresponding graphite regenerative block in circumferential insulating layer top is heated；It is logical from the air inlet of housing bottom
Enter inert gas, inert gas successively passes through bottom support plate air hole and n graphite regenerative block from top insulating layer gas outlet
Discharge.
In a kind of above-mentioned graphite electric induction heater high temperature curve realization device, the graphite regenerative block is column knot
Structure；And graphite regenerative block is evenly arranged with through-hole along axial direction；The percent opening of graphite regenerative block is θ.
A kind of graphite electric induction heater high temperature curve implementation method, includes the following steps:
Step 1: the effective height that measurement obtains n adjoining graphite regenerative block is H；Calculate having for single graphite regenerative block
Imitate height h；And calculate the quality m of single graphite regenerative block；
Step 2: by induction coil to the graphite regenerative block heating of k, top；Set the effect load of single graphite regenerative block
Function is rate P；Calculate the load power P of each graphite regenerative blocki；1≤k < n, and k is positive integer；N adjoining graphite regenerative block from
Under it is supreme press 1,2,3 ..., the serial number sequence of n；I is the serial number of graphite regenerative block；1≤i≤n；
Step 3: n adjoining graphite regenerative block is equidistant evenly distributed along the vertical direction；Adjacent 2 graphite regenerative blocks
Spacing δ be 10-50mm；
Step 4: according to the diameter D of graphite regenerative block0With the ratio of the spacing δ of adjacent 2 graphite regenerative blocksUsing
Linear interpolation method calculates the radiant heat transfer ascent F of adjacent 2 graphite regenerative blocks, F≤1；
Step 5: setting bottom support plate is not kept the temperature；If environment temperature T0For 288K；It is vertical to calculate n graphite regenerative block
The off-energy P of direction bottom endLoss；
Step 6: the initial temperature T of setting graphite regenerative blockInitially=T0；
Step 7: the temperature control equation after the 1st graphite regenerative block of calculating is discrete；Calculate the 2nd graphite regenerative block~the (n-1)th
Temperature control equation after graphite regenerative block is discrete；Calculate the n-th graphite regenerative block it is discrete after temperature control equation；
Step 8: calculating the preheating end time temperature T of the 1st graphite regenerative block1 (end)；Calculate the 2nd graphite regenerative block~the
The preheating end time temperature T of n-1 graphite regenerative blocki (end)；I is the ordinal number of graphite regenerative block, and i is positive integer, and 2≤i≤n-
1；Calculate the preheating end time temperature of the n-th graphite regenerative block
Step 9: calculating the 1st graphite regenerative block and the n-th graphite regenerative block preheating end time temperature difference Δ T；Setting is maximum
Temperature difference threshold Δ TmaxWith the maximum temperature threshold T of the n-th graphite regenerative blockmax；As Δ T >=Δ Tmax；And the n-th graphite regenerative block
Preheat end time temperatureWhen, design meet demand；Otherwise, the numerical value for increasing n repeats step 1 to step
Nine, until meeting Δ T >=Δ Tmax；And n-th graphite regenerative block preheating end time temperature
In a kind of above-mentioned graphite electric induction heater high temperature curve implementation method, the step 1, single graphite
The calculation method of regenerative block effective height h are as follows:
The calculation method of single graphite regenerative block quality m are as follows:
In formula, ρ is the density of graphite regenerative block；
D0For the diameter of graphite regenerative block.
In a kind of above-mentioned graphite electric induction heater high temperature curve implementation method, the step 2, i-th of graphite
The load power P of regenerative blockiCalculation method are as follows:
As 1≤i < n-k, Pi=0；
As n-k < i≤n, Pi=P.
In a kind of above-mentioned graphite electric induction heater high temperature curve implementation method, the step 4, using linear
The method of interpolation calculation radiant heat transfer ascent F are as follows:
4 interpolation points are set, are respectively as follows:
WhenWhen, F=0.2；
WhenWhen, F=0.48；
WhenWhen, F=0.64；
WhenWhen, F=0.72；
It is otherIt is worth corresponding F value, is obtained according to linear interpolation method.
In a kind of above-mentioned graphite electric induction heater high temperature curve implementation method, the step 5, off-energy
PLossCalculation method are as follows:
In formula, ε is the blackness on graphite material surface；ε=0.95；
σbFor Stefan-Boltzmann constant；σb=5.67 × 10-8；
T1For the temperature of the 1st graphite regenerative block.
In a kind of above-mentioned graphite electric induction heater high temperature curve implementation method, the step 7, the 1st graphite stores
The calculation method of temperature control equation after heat block is discrete are as follows:
S1: the temperature control equation of the 1st graphite regenerative block is established:
In formula, ρ is the density of graphite regenerative block；
M is single graphite regenerative block quality；
CpFor graphite material specific heat；
T1For the temperature of the 1st graphite regenerative block；
T2For the temperature of the 2nd graphite regenerative block；
F is radiant heat transfer ascent；
P1For the load power of the 1st graphite regenerative block；
S2: graphite accumulation of heat deblocking temperature is solved using numerical discretization schemes；The temperature controlling party of 1st graphite regenerative block after discrete
Journey conversion are as follows:
In formula, T1 (t)For the temperature value of the 1st graphite regenerative block t time step；
T1 (t-1)For the temperature value of the 1st graphite regenerative block t-1 time step；
For the temperature value of the 2nd graphite regenerative block t-1 time step.
In a kind of above-mentioned graphite electric induction heater high temperature curve implementation method, the step 7, the 2nd graphite stores
The calculation method of temperature control equation after heat block~(n-1)th graphite regenerative block is discrete are as follows:
S1: the 2nd graphite regenerative block~(n-1)th graphite regenerative block temperature control equation is established:
In formula, Ti-1For the temperature of the (i-1)-th graphite regenerative block；
TiFor the temperature of the i-th graphite regenerative block；
Ti+1For the temperature of i+1 graphite regenerative block；
S2: graphite accumulation of heat deblocking temperature is solved using numerical discretization schemes；2nd graphite regenerative block~(n-1)th graphite after discrete
The temperature control equation of regenerative block converts are as follows:
In formula, Ti (t)For the temperature value of the i-th graphite regenerative block t time step；
Ti (t-1)For the temperature value of the i-th graphite regenerative block t-1 time step；
For the temperature value of the (i-1)-th graphite regenerative block t-1 time step；
For the temperature value of i+1 graphite regenerative block t-1 time step.
In a kind of above-mentioned graphite electric induction heater high temperature curve implementation method, the step 7, the n-th graphite stores
The calculation method of temperature control equation after heat block is discrete are as follows:
S1: the temperature control equation of the n-th graphite regenerative block is established:
In formula, Tn-1For the temperature of the (n-1)th graphite regenerative block；
TnFor the temperature of the n-th graphite regenerative block；
S2: graphite accumulation of heat deblocking temperature is solved using numerical discretization schemes；The temperature controlling party of n-th graphite regenerative block after discrete
Journey conversion are as follows:
In formula,For the temperature value of the n-th graphite regenerative block t time step；
For the temperature value of the n-th graphite regenerative block t-1 time step；
For the temperature value of the (n-1)th graphite regenerative block t-1 time step.
In a kind of above-mentioned graphite electric induction heater high temperature curve implementation method, the step 8, the 1st graphite stores
The preheating end time temperature T of heat block1 (end)Calculation method are as follows: simultaneous formula (2) and formula (3), be calculated the 1st graphite storage
The preheating end time temperature T of heat block1 (end)；2nd graphite regenerative block~(n-1)th graphite regenerative block preheating end time temperature Ti (end)Calculation method are as follows: the 2nd graphite regenerative block~(n-1)th graphite regenerative block is calculated in simultaneous formula (1) and formula (3)
Preheat end time temperature Ti (end)；The preheating end time temperature of n-th graphite regenerative blockCalculation method are as follows: simultaneous formula
(1) and formula (2) the preheating end time temperature of the n-th graphite regenerative block, is calculated
In a kind of above-mentioned graphite electric induction heater high temperature curve implementation method, the step 9, the 1st graphite stores
The calculation method of heat block and the n-th graphite regenerative block preheating end time temperature difference Δ T are as follows:
The invention has the following advantages over the prior art:
(1) graphite electric induction heater of the present invention is a kind of superhigh temperature heat accumulating type gas heater, and it is lazy to can be used for nitrogen etc.
Property gas heating, gas temperature can be heated to 2300K magnitude, can meet the ground simulations such as hypersonic wind tunnel, test bay examination
Test the clean gas medium demand for heat of equipment；
(2) present invention uses graphite nonmetallic materials, and tolerable temperature is high, can satisfy superhigh temperature temperature demand just, and
Meet pure gas demand for heat simultaneously；
(3) present invention uses heat accumulating type heating technique, it is ensured that circulation area is sufficiently large, meets big flow demand for heat；
(4) present invention uses heat accumulating type heating technique, it is ensured that heat-storing material is enough, meets long-time heating demand.
Detailed description of the invention
Fig. 1 is graphite electric induction heater high temperature curve realization device schematic diagram of the present invention；
Fig. 2 is high temperature curve implementation flow chart of the present invention.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments:
The present invention provide a kind of graphite electric induction heater with high temperature curve realization device and implementation method be using it is each to
The graphite material of the same sex (high thermal conductivity coefficient), by using specific thermal-insulating scheme, graphite accumulation of heat block size, the specific piecemeal plan of design
Slightly, the specific factors such as heat-insulated, specific electrical induction mode in gap, innovation solve that graphite material axial thermal conductivity coefficient is excessively high to be caused
The problem of cannot achieve axial high-temperature gradient curve can be realized the preheating of graphite electric induction heater after the completion axial specific
High temperature curve breaks through graphite electric induction heater preheating technology.
It is as shown in Figure 1 graphite electric induction heater high temperature curve realization device schematic diagram, as seen from the figure, a kind of graphite
Electric induction heater high temperature curve realization device, including n graphite regenerative block 1, bottom support plate 8, circumferential insulating layer 9, shell
Body 10, induction coil 11 and top insulating layer 12；Wherein, shell 10 is the hollow columnar structures placed vertically；Bottom support plate 8
Lie in a horizontal plane in bottom in shell 10；N graphite regenerative block 1 is successively placed next to each other in the axis of 8 upper surface of bottom support plate vertically
At the heart；Circumferential insulating layer 9 is sleeved on the outer wall of n graphite regenerative block 1；Induction coil 11 is sleeved on circumferential 9 top of insulating layer
Side wall；Top insulating layer 12 is fixed at the top of circumferential insulating layer 9；And top insulating layer 12 stretches out shell 10；N is positive whole
Number, and n is more than or equal to 5.Graphite regenerative block 1 is column structure；And graphite regenerative block 1 is evenly arranged with through-hole along axial direction；Graphite
The percent opening of regenerative block 1 is θ.
The course of work are as follows: the axial bottom end of shell 10 is provided with air inlet；Top insulating layer 12 is provided with gas outlet；Bottom
Support plate 8 is provided with air hole；Air hole is located at the lower surface of graphite regenerative block 1；It is realized by induction coil 11 to circumferential guarantor
The corresponding graphite regenerative block 1 in warm 9 top of layer heats；It is passed through inert gas from the air inlet of 10 bottom of shell, inert gas is successively
It is discharged by 8 air hole of bottom support plate and n graphite regenerative block 1 from 12 gas outlet of top insulating layer；Realize that inert gas exists
By being heated when graphite regenerative block 1.
It is illustrated in figure 2 high temperature curve implementation flow chart, as seen from the figure, a kind of graphite electric induction heater high temperature curve
Implementation method includes the following steps:
Step 1: the effective height that measurement obtains n adjoining graphite regenerative block 1 is H；Calculate single graphite regenerative block 1
Effective height h；And calculate the quality m of single graphite regenerative block 1；
The calculation method of single 1 effective height h of graphite regenerative block are as follows:
The calculation method of single 1 mass m of graphite regenerative block are as follows:
In formula, ρ is the density of graphite regenerative block 1；
D0For the diameter of graphite regenerative block 1.
Step 2: being heated by 11 pairs of k, top graphite regenerative blocks 1 of induction coil；Set the effect of single graphite regenerative block 1
Load function is rate P；Calculate the load power P of each graphite regenerative block 1i；1≤k < n, and k is positive integer；N adjoining graphite accumulation of heat
Block 1 from bottom to up by 1,2,3 ..., the serial number sequence of n；I is the serial number of graphite regenerative block 1；1≤i≤n；
The load power P of i-th of graphite regenerative block 1iCalculation method are as follows:
As 1≤i < n-k, Pi=0；
As n-k < i≤n, Pi=P.
Step 3: n adjoining graphite regenerative block 1 is equidistant evenly distributed along the vertical direction；Adjacent 2 graphite regenerative blocks
1 spacing δ is 10-50mm；
Step 4: according to the diameter D of graphite regenerative block 10With the ratio of the spacing δ of adjacent 2 graphite regenerative blocks 1It adopts
The radiant heat transfer ascent F of adjacent 2 graphite regenerative blocks 1, F≤1 are calculated with linear interpolation method；
The method that radiant heat transfer ascent F is calculated using linear interpolation method are as follows:
4 interpolation points are set, are respectively as follows:
WhenWhen, F=0.2；
WhenWhen, F=0.48；
WhenWhen, F=0.64；
WhenWhen, F=0.72；
It is otherIt is worth corresponding F value, is obtained according to linear interpolation method.
Step 5: setting bottom support plate 8 is not kept the temperature；If environment temperature T0For 288K；It is perpendicular to calculate n graphite regenerative block 1
Off-energy P of the histogram to bottom endLoss；Off-energy PLossCalculation method are as follows:
In formula, ε is the blackness on graphite material surface；ε=0.95；
σbFor Stefan-Boltzmann constant；σb=5.67 × 10-8；
T1For the temperature of the 1st graphite regenerative block 1.
Step 6: the initial temperature T of setting graphite regenerative block 1Initially=T0；
Step 7: the temperature control equation after the 1st graphite regenerative block 1 of calculating is discrete；Calculate the 2nd graphite regenerative block 1~the
Temperature control equation after n-1 graphite regenerative block 1 is discrete；Calculate the n-th graphite regenerative block 1 it is discrete after temperature control equation；
The calculation method of temperature control equation after 1st graphite regenerative block 1 is discrete are as follows:
S1: the temperature control equation of the 1st graphite regenerative block 1 is established:
In formula, ρ is the density of graphite regenerative block 1；
M is single 1 mass of graphite regenerative block；
CpFor graphite material specific heat；
T1For the temperature of the 1st graphite regenerative block 1；
T2For the temperature of the 2nd graphite regenerative block 1；
F is radiant heat transfer ascent；
P1For the load power of the 1st graphite regenerative block 1；
S2: graphite accumulation of heat deblocking temperature is solved using numerical discretization schemes；The temperature control of 1st graphite regenerative block 1 after discrete
It is equations turned are as follows:
In formula, T1 (t)For the temperature value of 1 t time step of the 1st graphite regenerative block；
T1 (t-1)For the temperature value of 1 t-1 time step of the 1st graphite regenerative block；
For the temperature value of 1 t-1 time step of the 2nd graphite regenerative block.
The calculation method of temperature control equation after 2nd graphite regenerative block, 1~the (n-1)th graphite regenerative block 1 is discrete are as follows:
S1: the temperature control equation of 1~the (n-1)th graphite regenerative block 1 of the 2nd graphite regenerative block is established:
In formula, Ti-1For the temperature of the (i-1)-th graphite regenerative block 1；
TiFor the temperature of the i-th graphite regenerative block 1；
Ti+1For the temperature of i+1 graphite regenerative block 1；
S2: graphite accumulation of heat deblocking temperature is solved using numerical discretization schemes；2nd graphite regenerative block, 1~the (n-1)th graphite after discrete
The temperature control equation of regenerative block 1 converts are as follows:
In formula, Ti (t)For the temperature value of 1 t time step of the i-th graphite regenerative block；
Ti (t-1)For the temperature value of 1 t-1 time step of the i-th graphite regenerative block；
For the temperature value of 1 t-1 time step of the (i-1)-th graphite regenerative block；
For the temperature value of 1 t-1 time step of i+1 graphite regenerative block.
The calculation method of temperature control equation after n-th graphite regenerative block 1 is discrete are as follows:
S1: the temperature control equation of the n-th graphite regenerative block 1 is established:
In formula, Tn-1For the temperature of the (n-1)th graphite regenerative block 1；
TnFor the temperature of the n-th graphite regenerative block 1；
S2: graphite accumulation of heat deblocking temperature is solved using numerical discretization schemes；The temperature control of n-th graphite regenerative block 1 after discrete
It is equations turned are as follows:
In formula,For the temperature value of 1 t time step of the n-th graphite regenerative block；
For the temperature value of 1 t-1 time step of the n-th graphite regenerative block；
For the temperature value of 1 t-1 time step of the (n-1)th graphite regenerative block.
Step 8: calculating the preheating end time temperature T of the 1st graphite regenerative block 11 (end)；Calculate the 2nd graphite regenerative block 1~
The preheating end time temperature T of (n-1)th graphite regenerative block 1i (end)；I is the ordinal number of graphite regenerative block 1, and i is positive integer, and 2≤i
≤n-1；Calculate the preheating end time temperature of the n-th graphite regenerative block 1
The preheating end time temperature T of 1st graphite regenerative block 11 (end)Calculation method are as follows: simultaneous formula (2) and formula
(3), the preheating end time temperature T of the 1st graphite regenerative block 1 is calculated1 (end)；2nd graphite regenerative block, 1~the (n-1)th graphite stores
The preheating end time temperature T of heat block 1i (end)Calculation method are as follows: the 2nd graphite is calculated in simultaneous formula (1) and formula (3)
The preheating end time temperature T of 1~the (n-1)th graphite regenerative block 1 of regenerative blocki (end)；The preheating end time of n-th graphite regenerative block 1
TemperatureCalculation method are as follows: simultaneous formula (1) and formula (2), be calculated the n-th graphite regenerative block 1 preheating terminate when
Carve temperature
Step 9: calculating the 1st graphite regenerative block 1 and the n-th graphite regenerative block 1 preheating end time temperature difference Δ T；
The calculation method of 1st graphite regenerative block 1 and the n-th graphite regenerative block 1 preheating end time temperature difference Δ T are as follows:
Set maximum temperature difference threshold value Δ TmaxWith the maximum temperature threshold T of the n-th graphite regenerative block 1max；As Δ T >=Δ Tmax；
And n-th graphite regenerative block 1 preheating end time temperatureWhen, design meet demand；Otherwise, increase the numerical value of n,
Step 1 is repeated to step 9, until meeting Δ T >=Δ Tmax；And n-th graphite regenerative block 1 preheating end time temperature
In the present invention, graphite electric induction heater is a kind of heat accumulating type inert gas heater, mainly by band axially extending bore
Graphite regenerative block 1, heat preservation side local setting induction coil 11, circumferential insulating layer 9, top insulating layer 12 is without heat preservation or cooling
The composition such as bottom support plate 8.This paper graphite electric induction heater high temperature curve implementation method is that a set of realization graphite electric induction adds
The method of hot device preheating final temperature curve.Top insulating layer 12, bottom graphite regenerative block are arranged using top graphite regenerative block 1
The integral heat insulation scheme that 1 downside is not provided with insulating layer, is respectively provided with circumferential insulating layer 9, using to top side section graphite regenerative block 1
The whole heat protocol of preheating is passed in electric induction preheating, remaining bottom side graphite regenerative block 1, selects isotropism (high thermal conductivity system
Number) graphite material, axial energy transfer rate is reduced using the heat-insulated mode in gap, passes through graphite electric induction heater high temperature song
Line engineering simplification calculation method designs suitable partition strategy, to increase top graphite regenerative block 1 and bottom graphite regenerative block 1
Temperature difference, realize the graphite electric induction heater high temperature curve met the requirements
The content that description in the present invention is not described in detail belongs to the well-known technique of those skilled in the art.
Claims (13)
1. a kind of graphite electric induction heater high temperature curve realization device, it is characterised in that: including n graphite regenerative block (1),
Bottom support plate (8), circumferential insulating layer (9), shell (10), induction coil (11) and top insulating layer (12)；Wherein, shell
(10) hollow columnar structures to place vertically；Bottom support plate (8) lies in a horizontal plane in shell (10) interior bottom；N graphite stores
Heat block (1) is successively placed next to each other in vertically at the axle center of bottom support plate (8) upper surface；Circumferential insulating layer (9) is sleeved on n stone
The outer wall of black regenerative block (1)；Induction coil (11) is sleeved on the side wall on circumferential insulating layer (9) top；Top insulating layer (12) is solid
Top of the fixed setting in circumferential insulating layer (9)；And top insulating layer (12) stretches out shell (10)；N is positive integer, and n is greater than etc.
In 5.
2. a kind of graphite electric induction heater high temperature curve realization device according to claim 1, it is characterised in that: shell
The axial bottom end of body (10) is provided with air inlet；Top insulating layer (12) is provided with gas outlet；Bottom support plate (8) is provided with
Stomata；Air hole is located at the lower surface of graphite regenerative block (1)；It is realized by induction coil (11) to circumferential insulating layer (9) top
Corresponding graphite regenerative block (1) heating；It is passed through inert gas from the air inlet of shell (10) bottom, inert gas is successively the bottom of by
Portion's support plate (8) air hole and n graphite regenerative block (1) are discharged from top insulating layer (12) gas outlet；Realize that inert gas exists
By being heated when graphite regenerative block (1).
3. a kind of graphite electric induction heater high temperature curve realization device according to claim 2, it is characterised in that: institute
Stating graphite regenerative block (1) is column structure；And graphite regenerative block (1) is evenly arranged with through-hole along axial direction；Graphite regenerative block (1)
Percent opening is θ.
4. a kind of graphite electric induction heater high temperature curve implementation method, characterized by the following steps:
Step 1: the effective height that measurement obtains n adjoining graphite regenerative block (1) is H；Calculate single graphite regenerative block (1)
Effective height h；And calculate the quality m of single graphite regenerative block (1)；
Step 2: by induction coil (11) to graphite regenerative block (1) heating of k, top；Set single graphite regenerative block (1)
Effect load function is rate P；Calculate the load power P of each graphite regenerative block (1)i；1≤k < n, and k is positive integer；N adjoining graphite
Regenerative block (1) from bottom to up by 1,2,3 ..., the serial number sequence of n；I is the serial number of graphite regenerative block (1)；1≤i≤n；
Step 3: n adjoining graphite regenerative block (1) is equidistant evenly distributed along the vertical direction；Adjacent 2 graphite regenerative blocks
(1) spacing δ is 10-50mm；
Step 4: according to the diameter D of graphite regenerative block (1)0With the ratio of the spacing δ of adjacent 2 graphite regenerative blocks (1)It adopts
The radiant heat transfer ascent F of adjacent 2 graphite regenerative blocks (1), F≤1 are calculated with linear interpolation method；
Step 5: setting bottom support plate (8) is not kept the temperature；If environment temperature T0For 288K；It is vertical to calculate n graphite regenerative block (1)
The off-energy P of direction bottom endLoss；
Step 6: the initial temperature T of setting graphite regenerative block (1)Initially=T0；
Step 7: the temperature control equation after the 1st graphite regenerative block (1) of calculating is discrete；Calculate the 2nd graphite regenerative block (1)~the
Temperature control equation after n-1 graphite regenerative block (1) is discrete；Calculate the n-th graphite regenerative block (1) it is discrete after temperature controlling party
Journey；
Step 8: calculating the preheating end time temperature T of the 1st graphite regenerative block (1)1 (end)；Calculate the 2nd graphite regenerative block (1)~
The preheating end time temperature T of (n-1)th graphite regenerative block (1)i (end)；I is the ordinal number of graphite regenerative block (1), and i is positive integer, and 2
≤i≤n-1；Calculate the preheating end time temperature of the n-th graphite regenerative block (1)
Step 9: calculating the 1st graphite regenerative block (1) and the n-th graphite regenerative block (1) preheating end time temperature difference Δ T；Setting is most
Big temperature difference threshold Δ TmaxWith the maximum temperature threshold T of the n-th graphite regenerative block (1)max；As Δ T >=Δ Tmax；And the n-th graphite accumulation of heat
The preheating end time temperature of block (1)When, design meet demand；Otherwise, increase the numerical value of n, repeat step 1
To step 9, until meeting Δ T >=Δ Tmax；And n-th graphite regenerative block (1) preheating end time temperature
5. a kind of graphite electric induction heater high temperature curve implementation method according to claim 4, it is characterised in that: institute
It states in step 1, the calculation method of single graphite regenerative block (1) effective height h are as follows:
The calculation method of single graphite regenerative block (1) quality m are as follows:
In formula, ρ is the density of graphite regenerative block (1)；
D0For the diameter of graphite regenerative block (1).
6. a kind of graphite electric induction heater high temperature curve implementation method according to claim 5, it is characterised in that: institute
It states in step 2, the load power P of i-th of graphite regenerative block (1)iCalculation method are as follows:
As 1≤i < n-k, Pi=0；
As n-k < i≤n, Pi=P.
7. a kind of graphite electric induction heater high temperature curve implementation method according to claim 6, it is characterised in that: institute
It states in step 4, the method that radiant heat transfer ascent F is calculated using linear interpolation method are as follows:
4 interpolation points are set, are respectively as follows:
WhenWhen, F=0.2；
WhenWhen, F=0.48；
WhenWhen, F=0.64；
WhenWhen, F=0.72；
It is otherIt is worth corresponding F value, is obtained according to linear interpolation method.
8. a kind of graphite electric induction heater high temperature curve implementation method according to claim 7, it is characterised in that: institute
It states in step 5, off-energy PLossCalculation method are as follows:
In formula, ε is the blackness on graphite material surface；ε=0.95；
σbFor Stefan-Boltzmann constant；σb=5.67 × 10-8；
T1For the temperature of the 1st graphite regenerative block (1).
9. a kind of graphite electric induction heater high temperature curve implementation method according to claim 8, it is characterised in that: institute
It states in step 7, the calculation method of the temperature control equation after the 1st graphite regenerative block (1) is discrete are as follows:
S1: the temperature control equation of the 1st graphite regenerative block (1) is established:
In formula, ρ is the density of graphite regenerative block (1)；
M is single graphite regenerative block (1) quality；
CpFor graphite material specific heat；
T1For the temperature of the 1st graphite regenerative block (1)；
T2For the temperature of the 2nd graphite regenerative block (1)；
F is radiant heat transfer ascent；
P1For the load power of the 1st graphite regenerative block (1)；
S2: graphite accumulation of heat deblocking temperature is solved using numerical discretization schemes；The temperature controlling party of 1st graphite regenerative block (1) after discrete
Journey conversion are as follows:
In formula, T1 (t)For the temperature value of (1) t time step of the 1st graphite regenerative block；
T1 (t-1)For the temperature value of (1) t-1 time step of the 1st graphite regenerative block；
For the temperature value of (1) t-1 time step of the 2nd graphite regenerative block.
10. a kind of graphite electric induction heater high temperature curve implementation method according to claim 9, it is characterised in that:
In the step 7, the calculating of the temperature control equation after the 2nd graphite regenerative block (1)~(n-1)th graphite regenerative block (1) is discrete
Method are as follows:
S1: the temperature control equation of the 2nd graphite regenerative block (1)~(n-1)th graphite regenerative block (1) is established:
In formula, Ti-1For the temperature of the (i-1)-th graphite regenerative block (1)；
TiFor the temperature of the i-th graphite regenerative block (1)；
Ti+1For the temperature of i+1 graphite regenerative block (1)；
S2: graphite accumulation of heat deblocking temperature is solved using numerical discretization schemes；2nd graphite regenerative block (1)~(n-1)th graphite stores after discrete
The temperature control equation of heat block (1) converts are as follows:
In formula, Ti (t)For the temperature value of (1) t time step of the i-th graphite regenerative block；
Ti (t-1)For the temperature value of (1) t-1 time step of the i-th graphite regenerative block；
For the temperature value of (1) t-1 time step of the (i-1)-th graphite regenerative block；
For the temperature value of (1) t-1 time step of i+1 graphite regenerative block.
11. a kind of graphite electric induction heater high temperature curve implementation method according to claim 10, it is characterised in that:
In the step 7, the calculation method of the temperature control equation after the n-th graphite regenerative block (1) is discrete are as follows:
S1: the temperature control equation of the n-th graphite regenerative block (1) is established:
In formula, Tn-1For the temperature of the (n-1)th graphite regenerative block (1)；
TnFor the temperature of the n-th graphite regenerative block (1)；
S2: graphite accumulation of heat deblocking temperature is solved using numerical discretization schemes；The temperature controlling party of n-th graphite regenerative block (1) after discrete
Journey conversion are as follows:
In formula,For the temperature value of (1) t time step of the n-th graphite regenerative block；
For the temperature value of (1) t-1 time step of the n-th graphite regenerative block；
For the temperature value of (1) t-1 time step of the (n-1)th graphite regenerative block.
12. a kind of graphite electric induction heater high temperature curve implementation method according to claim 11, it is characterised in that:
In the step 8, the preheating end time temperature T of the 1st graphite regenerative block (1)1 (end)Calculation method are as follows: simultaneous formula (2) and
The preheating end time temperature T of the 1st graphite regenerative block (1) is calculated in formula (3)1 (end)；2nd graphite regenerative block (1)~n-th-
The preheating end time temperature T of 1 graphite regenerative block (1)i (end)Calculation method are as follows: simultaneous formula (1) and formula (3) calculate
To the preheating end time temperature T of the 2nd graphite regenerative block (1)~(n-1)th graphite regenerative block (1)i (end)；N-th graphite regenerative block (1)
Preheating end time temperatureCalculation method are as follows: the n-th graphite regenerative block is calculated in simultaneous formula (1) and formula (2)
(1) preheating end time temperature
13. a kind of graphite electric induction heater high temperature curve implementation method according to claim 12, it is characterised in that:
In the step 9, the calculating side of the 1st graphite regenerative block (1) and the n-th graphite regenerative block (1) preheating end time temperature difference Δ T
Method are as follows:
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| CN115265248A (en) * | 2022-09-23 | 2022-11-01 | 中国空气动力研究与发展中心超高速空气动力研究所 | Internal element supporting device for ultra-large heat accumulating type heater and mounting method |
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