CN207455571U - Multi-level phase change heat accumulating type high-temperature air burning energy saver - Google Patents
Multi-level phase change heat accumulating type high-temperature air burning energy saver Download PDFInfo
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- CN207455571U CN207455571U CN201721320047.1U CN201721320047U CN207455571U CN 207455571 U CN207455571 U CN 207455571U CN 201721320047 U CN201721320047 U CN 201721320047U CN 207455571 U CN207455571 U CN 207455571U
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- heat
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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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
A kind of multi-level phase change heat accumulating type high-temperature air burning energy saver of the utility model, described device include：Reversal valve, heat storage, burner, fuel inlet and combustion chamber.Reversal valve connects air intlet and offgas outlet, and any switching laws between air intlet and offgas outlet；Heat storage is connected with reversal valve；Heat storage includes the first heat storage and the second heat storage, and the first heat storage is connected by reversal valve with air intlet or offgas outlet；Second heat storage is connected by reversal valve with offgas outlet or air intlet, and burner is connected with heat storage；Fuel inlet is connected with burner；Combustion chamber is connected with burner.The device can efficiently use fume afterheat, improve the stability of burner flame.Meanwhile the heat-exchanger rig is simple in structure, easily transforms, related phase-change material can be replaced according to different operating modes.
Description
Technical field
The utility model belongs to combustion energy saving technical field more particularly to a kind of multi-level phase change heat accumulating type high-temperature air burning
Energy saver.
Background technology
In recent years, as national governments are to the pay attention to day by day of efforts at environmental protection, all risen in worldwide pollution administration,
The movement of environmental protection.New green technology and product continues to bring out, while is also constantly be generated new problem.Coal dust firing exists
Critical role and the always key points and difficulties of pollution administration are accounted in disposal of pollutants.
How boiler thermal efficiency is improved, it is energy saving, soot emissions are reduced, are effective solution China's energy and environmental problem
Important step.And in this link, it is key point to improve efficiency of combustion.To solve the above problems, using third generation heat accumulating type
Combustion technology is undoubtedly a selection well.
Regenerative combustion technology is the combustion technology of latest generation, is third generation combustion technology.For the first generation and second
For the low situation of the burner hearth heat utilization efficiency of combustion technology, third generation heat accumulating type high temperature air combustion technology is various anti-with that can improve
The advantages of answering the heat utilization efficiency of device and reaction temperature, the quality and grade of reduction fuel, is advantageously implemented low oxygen and low nitrogen burning, together
When can reduce the generation of atmospheric haze.The burner hearth heat utilization efficiency of third generation regenerative combustion technology is up to 86%, systematic heat utilization
Rate is up to more than 94%.
The key of third generation regenerative combustion technology is the utilization of heat storage.The heat storage of existing regenerative combustion technology
It is with materials such as refractory brick, these heat-storing materials are to store heat by material sensible heat.Since sensible heat accumulation of heat has energy
The shortcomings that density is small, range of temperature is big so that third generation regenerative combustion technology commutates frequently there are reversal valve, burner combustion
Burn the shortcomings that unstable.
The content of the invention
To solve the above-mentioned problems, the utility model provides a kind of energy saving dress of multi-level phase change heat accumulating type high-temperature air burning
It puts, described device includes：
Reversal valve, the reversal valve connect air intlet and offgas outlet respectively；
Heat storage, the heat storage are connected with the reversal valve, by the flue gas accumulation of heat generated in combustion chamber, and
The gas entered through the air intlet is heated；The reversal valve is in the air intlet and the tail gas
Any switching laws between outlet, make that air intlet is connected with heat storage or offgas outlet is connected with heat storage；
Burner, the burner are connected with the heat storage；
Fuel inlet, the fuel inlet connect the burner；
Combustion chamber, the combustion chamber are connected with the burner.
Further, the heat storage includes the first heat storage and the second heat storage, and first heat storage passes through described
Reversal valve is connected with the air intlet or the offgas outlet；Second heat storage passes through the reversal valve and the tail gas
Outlet or air intlet connection.
Further, the burner includes the first burner and the second burner, first burner and first heat storage
Connection；Second burner is connected with second heat storage；First burner and second burner are connected to oil
Air cock.
Preferably, the heat storage is multi-level phase change heat storage.
Further, the heat storage includes multiple thermal storage units, and the thermal storage unit includes high-temperature heat accumulation unit, medium temperature
Thermal storage unit, low-temperature heat accumulating unit.
Further, the high-temperature heat accumulation unit is equipped with high temperature phase change material (pcm), and the medium temperature regenerator unit is equipped with medium temperature phase
Become material, the low-temperature heat accumulating unit is equipped with low-temperature phase-change material, the high-temperature heat accumulation unit, medium temperature regenerator unit and low temperature
Thermal storage unit is arranged in order in the heat storage according to along flow of flue gas direction, temperature sequence.
Further, both sides are equipped with multiple spoilers inside the heat storage.
Further, gap is provided between the phase-change material in the thermal storage unit, for the flowing of flue gas.
Further, the phase-change material in the thermal storage unit is supported by accumulation of heat stent and placed.
Preferably, the connecting rod and side support that the accumulation of heat stent includes horizontal positioned support plate, places vertically,
Multiple support plates by the connecting rod vertical direction interval connect, the side support be placed in the support plate it
Between, and be connected with the connecting rod, the connecting rod and the side support form the stereoscopic grid being layered, and the support plate is set
It is placed in each layer and places phase-change material.
A kind of the advantages of multi-level phase change heat accumulating type high-temperature air burning energy saver of the utility model, is：
1. the device of the utility model is a kind of more efficient regenerative combustion system using fume afterheat.
2. phase-transition heat-storage material can be replaced according to actual conditions using multistage latent-heat storage body in the device of the utility model
Material, temperature control is more flexible, and pre-heated gas temperature is more steady.
3. the phase-change material that heat storage uses in the utility model is cheap for fuse salt solid-liquid sizing phase-change material,
It is at low cost.
4. the phase-change material storage density in the multi-level phase change heat storage used in the utility model is big, the heat accumulation time is long,
Reversal valve need not frequently commutate.
5. the phase-change material in the utility model has the characteristics that phase transition temperature is constant, it is ensured that the temperature of preheated air
It is relative constant in a longer period of time, so that the flame of burner is more steady.
Description of the drawings
Fig. 1 is the schematic diagram of the utility model multi-level phase change heat accumulating type high-temperature air burning energy saver.
Fig. 2 is the structure diagram of the utility model heat storage.
Fig. 3 is the structure diagram of the utility model accumulation of heat stent.
1- air intlets, 2- reversal valves, the first heat storages of 3-, 4- oil and gas switch, the first burners of 5-, 6- combustion chambers, 7-
Two burners, the second heat storages of 8-, 9- offgas outlets, 10- high-temperature heat accumulations unit, 11- medium temperature regenerators unit, 12- low-temperature heat accumulating lists
Member, 13- flat brackets, 14- connecting rods, 15- side supports.
Specific embodiment
Below with reference to attached drawing, to the multi-level phase change heat accumulating type high-temperature air burning energy saver of the utility model into traveling
One step it is described in detail.
The structural representation of the utility model multi-level phase change heat accumulating type high-temperature air burning energy saver according to figure 1
Figure, the utility model include air intlet 1, reversal valve 2, the first heat storage 3, oil and gas switch 4, the first burner 5, combustion chamber 6,
Second burner 7, the second heat storage 8, offgas outlet 9.The reversal valve 2 connects air intlet 1 and offgas outlet 9, and described
Any switching laws between air intlet 1 and the offgas outlet 9；The heat storage is connected with the reversal valve 2, and the heat storage includes
First heat storage 3 and the second heat storage 8, first heat storage 3 pass through the reversal valve 2 and the air intlet 1 or described
Offgas outlet 9 connects；Second heat storage 8 is connected by the reversal valve 2 and the offgas outlet 9 or the air intlet 1
It connects.The combustion chamber 6 is connected with the burner, the burner include the first burner 5 and the second burner 7, first burner 5 with
First heat storage 3 connects；Second burner 7 is connected with second heat storage 8；First burner 5 and described
Two burners 7 are connected to oil and gas switch 4.
According to the structure diagram of the utility model heat storage shown in Fig. 2, the heat storage includes multiple thermal storage units,
The thermal storage unit includes high-temperature heat accumulation unit 10, medium temperature regenerator unit 11, low-temperature heat accumulating unit 12.Described in the utility model
High-temperature heat accumulation unit 10 is equipped with high temperature phase change material (pcm), and the medium temperature regenerator unit 11 is equipped with medium temperature phase-change material, the Low Temperature Storage
Hot cell 12 is equipped with low-temperature phase-change material, the high-temperature heat accumulation unit 10, medium temperature regenerator unit 11 and low-temperature heat accumulating unit 12
It is arranged in order from top to bottom according to along flow of flue gas direction, temperature sequence in the heat storage.Also, the utility model
Described in inside heat storage both sides multiple spoilers are installed.Gap is provided between the thermal storage unit, for the stream of flue gas
It is dynamic.There are many phase-change material of sizing in heat storage in the utility model, due to traditional phase-change material be thermal conductivity factor compared with
Low inorganic salt materials, therefore, phase-change material positioned at each row in thermal storage unit are staggered to improve accumulation of heat
The heat transfer effect of body.And the spoiler set in the utility model is then to improve the effect of the heat exchange between flue gas and phase-change material
Fruit.
According to the structure diagram of the utility model accumulation of heat stent shown in Fig. 3, it is provided on the outside of the thermal storage unit
Accumulation of heat stent.The accumulation of heat stent includes horizontal positioned support plate 13, the connecting rod 14 placed vertically and side support 15,
Multiple support plates 13 are connected by the connecting rod 14 at vertical direction interval, and the side support 15 is placed in the stent
Between tablet 13, and it is connected with the connecting rod 14.Block sizing phase-change material in the present invention lies in the support plate 13
On, the flue gas that volume of phase-change material is flowed in order to prevent is blown, and the side of phase-change material is stopped by side support 15.The branch
Frame tablet 13, side support 15 and connecting rod 14 use heat safe stainless steel.
The purpose of this utility model is that propose a kind of multi-level phase change heat accumulating type high-temperature air burning energy saver, the device
Fume afterheat can be efficiently used, improves the stability of burner flame.The heat-exchanger rig is simple in structure simultaneously, easily transforms, phase
Closing phase-change material can be replaced according to different operating modes.Since phase-change material just has, storage density is big, phase transition temperature is constant, phase
The advantages that variable volume variation is small so that the heat-accumulating burner solves the air temperature variations model of gas commutation frequently, after preheating
The problem of enclosing big caused burner flame combustion instability.Also, all phase-change materials are all sizing phases in the utility model
Become material, in solid-liquid phase transition process, shape remains unchanged, the situation that will not be flowed, and corrosivity is small.
A kind of operational process of multi-level phase change heat accumulating type high-temperature air burning energy saver of the utility model is：Room temperature is empty
Gas enters 2 reversal valves by gas feed 1, at this point, the reversal valve 2 commutates by solid line in Fig. 1.Afterwards into right side the
One heat storage 3, stored in the latent heat storage material of the first heat storage 3 has heat at this time, after gas at normal temperature is by first heat storage 3
First burner 5 is entered by heating.At this point, the oil and gas switch 4 positioned at right side is open-minded, the oil and gas import 4 positioned at left side is closed, fuel oil
Or combustion gas is then entered by right side oil and gas switch 4 in the first burner 5 of right side, is mixed with heated gas and in combustion chamber 6
Burning.Gas after burning is then entered by the second burner of left side 7 in the second heat storage 8 of left side.At this point, fume afterheat is stored
In the second heat storage of left side 8.Tail gas after being cooled down enters after being come out from the second heat storage 8 in reversal valve 2, through offgas outlet
9 discharges.
Until in the first heat storage of right side 3 after the heat release of latent heat heat accumulating, the reversal valve 2 is then such as Fig. 1
It commutates shown in middle dotted line, at this point, normal temperature air is entered by gas feed 1 in reversal valve 2, enters left side second afterwards and store
In hot body 8, second heat storage 8 has stored heat at this time, and normal temperature air then enters after second heat storage 8 is preheated
In the second burner of left side 7.At this point, left side oil and gas switch 4 is open-minded, fuel oil or combustion gas then enter left side by left side oil and gas switch 4
In second burner 7, mix with heated gas and burn in combustion chamber 6.Gas after burning is then burnt by right side first
Mouth 5 enters in the first heat storage 3 of right side.At this point, fume afterheat is stored in the first heat storage 3 of right side, the tail after being cooled down
Gas enters after being come out from the first heat storage 3 in reversal valve 2, is discharged through offgas outlet 9.Reciprocation cycle uses as stated above.
Embodiment according to the present utility model by controlling the oil and gas switch 4 of the left and right sides, can control correspondingly accumulation of heat
The working condition of body.The first heretofore described heat storage 3 and the second heat storage 8 can also carry out multiple combustion chambers 6 pre-
Heat.
High temperature phase change material (pcm) in the utility model is the sizing solid-liquid phase-change material that phase transition temperature is 600-900 DEG C.Example
Such as：61Na2SO4- 39MgO, phase transition temperature are 884 DEG C；62Na2SO4-38SiO2, phase transition temperature is 858 DEG C；54LiF-46MgO,
Phase transition temperature is 849 DEG C；24Na2CO3-26BaCO3- 50MgO, phase transition temperature are 686 DEG C；54MgCl2-48SiO2, phase transition temperature
For 714 DEG C；45NaF-15MgF-40MgO, phase transition temperature are 832 DEG C；40LiF-20MgF2- 40MgO, phase transition temperature are 746 DEG C.
Medium temperature phase-change material in the utility model is the sizing solid-liquid phase-change material of 300-600 DEG C of phase transition temperature.Example
Such as：53Li2SO4- 47MgO, phase transition temperature are 577 DEG C；63KOH-37SiO2, phase transition temperature is 400 DEG C；
33.6Na2CO3-26.4Li2CO3- 40MgO, phase transition temperature are 496 DEG C；
33MgCl2- 12.24KCl-11.76NaCl-40MgO, phase transition temperature are 380 DEG C；
18.15NaCl-13.2KCl-23.65LiCl-45MgO, phase transition temperature are 346 DEG C；
24.44BaCl2-13.2KCl-15.95CaCl2- 48MgO, phase transition temperature are 551 DEG C；MgCl2- NaCl, phase alternating temperature
It spends for 435 DEG C.
Low-temperature phase-change material in the utility model is the sizing solid-liquid phase-change material of 100-300 DEG C of phase transition temperature.Example
Such as：41.8KCl-19.2ZnCl2- 40MgO, phase transition temperature are 235 DEG C；
29NaNO3-29KNO3- 42MgO, phase transition temperature are 220 DEG C；40LiNO3-60 diatomite, phase transition temperature are 250 DEG C；
55ZnCl-45MgO, phase transition temperature are 280 DEG C；52AlCl3- 48MgO, phase transition temperature are 190 DEG C.
Since sizing phase-change material makes simply, size can be made according to actual conditions.
Hereinafter, the behaviour in service of corresponding phase-change material under different waste heat supply temperatures will be illustrated by two embodiments.
Embodiment one
1. high-temperature shaping phase-change material is 24Na used by the present embodiment2CO3-26BaCO3- 50MgO, medium temperature sizing phase
Change material is 33.6Na2CO3-26.4Li2CO3- 40MgO, low-temperature shaped phase-change material are 29NaNO3-29KNO3-42MgO.Three kinds
The size of phase-change material is 170 × 100 × 40mm, and the clearance distance between phase-change material is 10mm.
2. combustion gas (methane) and air are burnt into the first burner 5 and in combustion chamber 6 by the first heat storage 3.
3. for the tail gas after burning into the second heat storage 8, waste heat is stored into the phase of the second heat storage 8 with heat accumulating heat exchange
Become in material.
4. when the exhaust temperature come out from the second heat storage 8 is higher than 200 DEG C, changes reversal valve 2, open simultaneously the second burning
Mouth 7；The phase-change material in normal temperature air and the second heat storage 8 carries out heat exchange heating at this time, with combustion gas (methane) in combustion chamber 6
Burning；
5. the tail gas after burning is stored into the phase transformation material of the first heat storage 3 into the first heat storage 3 with heat accumulating heat exchange
In material.
6. when the exhaust temperature come out from the first heat storage 3 is higher than 200 DEG C, change reversal valve 2.
Reciprocating operation as stated above.
Embodiment two
1. used by the present embodiment high-temperature shaping phase-change material be 45NaF-15MgF-40MgO, medium temperature sizing phase transformation material
Expect for 33MgCl2- 12.24KCl-11.76NaCl-40MgO, low-temperature shaped phase-change material are 52AlCl3-48MgO.Three kinds of phase transformations
The size of material is 170 × 100 × 40mm, and the clearance distance between phase-change material is 10mm.
2. combustion gas (methane) and air are burnt into the first burner 5 and in combustion chamber 6 by the first heat storage 3.
3. for the tail gas after burning into the second heat storage 8, waste heat is stored into the phase of the second heat storage 8 with heat accumulating heat exchange
Become in material.
4. when the exhaust temperature come out from the second heat storage 8 is higher than 150 DEG C, changes reversal valve 2, open simultaneously the second burning
Mouth 7；The phase-change material in normal temperature air and the second heat storage 8 carries out heat exchange heating at this time, with combustion gas (methane) in combustion chamber 6
Burning；
5. the tail gas after burning is stored into the phase transformation material of the first heat storage 3 into the first heat storage 3 with heat accumulating heat exchange
In material.
6. when the exhaust temperature come out from the first heat storage 3 is higher than 150 DEG C, change reversal valve 2.
Reciprocating operation as stated above.
The embodiment one and embodiment two provided in the utility model, employs different phase-change materials and carries out heat exchange storage
Heat, and then reflected for different waste heat supply temperatures, it is necessary to which applying working condition could be met using different phase-change materials.
In the utility model, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. terms should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be
Mechanical connection or electrical connection；It can be directly connected, can also be indirectly connected by intermediary, can be two
The interaction relationship of connection or two elements inside element.It for the ordinary skill in the art, can basis
Concrete condition understands concrete meaning of the above-mentioned term in the utility model.
In the utility model, unless otherwise clearly defined and limited, fisrt feature is "above" or "below" second feature
Can be that the first and second features contact directly or the first and second features pass through intermediary mediate contact.Moreover, first is special
Sign second feature " on ", " top " and " above " can be fisrt feature directly over second feature or oblique upper or only
Represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be with
It is fisrt feature immediately below second feature or obliquely downward or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment of the present invention or example.In the present specification, schematic expression of the above terms is not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
It is combined in an appropriate manner in a or multiple embodiments or example.In addition, without conflicting with each other, the technology of this field
Different embodiments described in this specification or example and different embodiments or exemplary feature can be combined by personnel
And combination.
Claims (10)
1. a kind of multi-level phase change heat accumulating type high-temperature air burning energy saver, which is characterized in that described device includes：
Reversal valve, the reversal valve connect air intlet and offgas outlet respectively,
Heat storage, the heat storage are connected with the reversal valve, by the flue gas accumulation of heat generated in combustion chamber, and to through the sky
The gas that gas import enters is heated；Reversal valve any switching laws between the air intlet and the offgas outlet, make
Air intlet is connected with heat storage or offgas outlet is connected with heat storage；
Burner, the burner are connected with the heat storage；
Fuel inlet, the fuel inlet connect the burner；
Combustion chamber, the combustion chamber are connected with the burner.
2. multi-level phase change heat accumulating type high-temperature air burning energy saver according to claim 1, which is characterized in that the storage
Hot body includes the first heat storage and the second heat storage,
First heat storage is connected by the reversal valve with the air intlet or the offgas outlet；
Second heat storage is connected by the reversal valve with the offgas outlet or the air intlet.
3. multi-level phase change heat accumulating type high-temperature air burning energy saver according to claim 2, which is characterized in that the burning
Mouth includes the first burner and the second burner,
First burner is connected with first heat storage；
Second burner is connected with second heat storage；
First burner and second burner are connected to oil and gas switch.
4. multi-level phase change heat accumulating type high-temperature air burning energy saver according to claim 1 or 2, which is characterized in that institute
Heat storage is stated as multi-level phase change heat storage.
5. multi-level phase change heat accumulating type high-temperature air burning energy saver according to claim 4, which is characterized in that the storage
Hot body includes multiple thermal storage units,
The thermal storage unit includes high-temperature heat accumulation unit, medium temperature regenerator unit, low-temperature heat accumulating unit.
6. multi-level phase change heat accumulating type high-temperature air burning energy saver according to claim 5, which is characterized in that
The high-temperature heat accumulation unit is equipped with high temperature phase change material (pcm),
The medium temperature regenerator unit is equipped with medium temperature phase-change material,
The low-temperature heat accumulating unit is equipped with low-temperature phase-change material,
The high-temperature heat accumulation unit, medium temperature regenerator unit and low-temperature heat accumulating unit are in the heat storage according to along flow of flue gas
Direction, temperature sequence are arranged in order.
7. multi-level phase change heat accumulating type high-temperature air burning energy saver according to claim 5, which is characterized in that the storage
Hot portion both sides in vivo are equipped with multiple spoilers.
8. multi-level phase change heat accumulating type high-temperature air burning energy saver according to claim 5, which is characterized in that the storage
Gap is provided between phase-change material in hot cell, for the flowing of flue gas.
9. multi-level phase change heat accumulating type high-temperature air burning energy saver according to claim 5, which is characterized in that the storage
Phase-change material in hot cell is supported by accumulation of heat stent to be placed.
10. multi-level phase change heat accumulating type high-temperature air burning energy saver according to claim 9, which is characterized in that described
The connecting rod and side support that accumulation of heat stent includes horizontal positioned support plate, places vertically,
Multiple support plates are connected by the connecting rod at vertical direction interval,
The side support is placed between the support plate, and is connected with the connecting rod,
The connecting rod and the side support form the stereoscopic grid of layering, and the support plate is arranged at each layer and places phase
Become material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721320047.1U CN207455571U (en) | 2017-10-13 | 2017-10-13 | Multi-level phase change heat accumulating type high-temperature air burning energy saver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721320047.1U CN207455571U (en) | 2017-10-13 | 2017-10-13 | Multi-level phase change heat accumulating type high-temperature air burning energy saver |
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| CN207455571U true CN207455571U (en) | 2018-06-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112066367A (en) * | 2020-09-17 | 2020-12-11 | 童勇赛 | Automatic heat accumulation formula of switching-over and pressure release fires burning furnace |
| CN112682949A (en) * | 2019-10-17 | 2021-04-20 | 芜湖美的厨卫电器制造有限公司 | Combustor, combustion assembly and gas water heater |
-
2017
- 2017-10-13 CN CN201721320047.1U patent/CN207455571U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112682949A (en) * | 2019-10-17 | 2021-04-20 | 芜湖美的厨卫电器制造有限公司 | Combustor, combustion assembly and gas water heater |
| CN112066367A (en) * | 2020-09-17 | 2020-12-11 | 童勇赛 | Automatic heat accumulation formula of switching-over and pressure release fires burning furnace |
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