CN112113451A - Smoke waste heat storage device - Google Patents
Smoke waste heat storage device Download PDFInfo
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- CN112113451A CN112113451A CN202010420831.XA CN202010420831A CN112113451A CN 112113451 A CN112113451 A CN 112113451A CN 202010420831 A CN202010420831 A CN 202010420831A CN 112113451 A CN112113451 A CN 112113451A
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- Prior art keywords
- heat
- heat storage
- flue gas
- storage device
- smoke
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- 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
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
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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
Abstract
The invention discloses a flue gas waste heat storage device, which comprises: a plurality of heat accumulation units, every heat accumulation unit includes fused salt heat accumulator and solid heat accumulator and heater, and the solid heat accumulator forms into hollow flue gas passageway, and partial flue gas passageway sets up in fused salt heat accumulator's inside, forms a whole with a plurality of heat accumulation unit combination together, and the heater sets up inside the fused salt heat accumulator. The flue gas waste heat storage device provided by the invention has the advantages of high heat utilization rate and high heat conduction efficiency; the problems of large flue gas waste heat recovery device, complex structure and less flexibility in use are solved.
Description
Technical Field
The invention belongs to the field of heat storage, and particularly relates to a flue gas waste heat storage device.
Background
The energy consumption of the industrial field in China accounts for about 70 percent of the total energy consumption of China, and the unit energy consumption of main industrial products is higher than the international advanced level by about 30 percent on average. Except for the factors that the production process is relatively laggard and the industrial structure is unreasonable, the low utilization rate of industrial waste heat is an important reason for high energy consumption, the energy utilization rate of China is only about 33 percent, which is about 10 percent lower than that of developed countries, and at least 50 percent of industrial energy consumption is directly abandoned by waste heat in various forms. Therefore, industrial waste heat resources in China are rich and widely exist in the production process of various industrial industries, the waste heat resources account for 17% -67% of the total fuel consumption, and the recovery rate can reach 60%. The waste heat recovery has various types, wherein the flue gas waste heat recovery is important content for promoting the energy conservation and emission reduction work in China. The smoke is the main way of wasting energy of general energy consumption equipment, for example, the energy consumption of boiler smoke is about 15%, and the main energy consumption of other equipment such as setting machine, drying-machine and kiln of printing and dyeing industry is through the smoke discharge, though adopt advanced burner to strengthen burning, reduced incomplete combustion volume, nevertheless, the technology that reduces the waste heat of exhaust smoke and retrieve the waste heat of smoke still develops unhappily. In order to further improve the heat efficiency of the fuel and achieve the purposes of energy conservation and consumption reduction, the recovery of the waste heat of the flue gas is an important energy-saving way.
At present, a plurality of devices for recovering the waste heat of the flue gas are mainly used for taking away the waste heat in the flue gas by using water, and because the flow velocity of the flue gas in a pipeline is high, the insufficient heat exchange (a large amount of heat exchange space is not utilized) is caused, the water consumption is also high, and the application of the device to some areas lacking water resources is limited. The fused salt has high heat storage density and good heat conduction performance, is a novel heat storage material widely applied at present, can store the energy of the waste heat of the flue gas, and then supplies heat for residents or provides a heat source for industrial and commercial users by exchanging heat with water or other media.
The existing technical problems are as follows:
(1) the existing flue gas waste heat recovery device is not high in recovery efficiency, causes serious heat source waste, is poor in environmental protection benefit, and is not suitable for popularization and application, mainly because the flue gas speed is high, the heat conduction efficiency of the traditional water heat exchange mode is low, and a large amount of heat is lost;
(2) the waste heat in the flue gas is recovered by water, so that the equipment has large volume and large occupied area. In view of the above, it is an urgent problem in the art to overcome the above-mentioned drawbacks of the prior art.
Disclosure of Invention
In order to overcome the technical problems in the prior art, the invention provides a flue gas waste heat storage device, which comprises:
the heat storage device comprises a plurality of heat storage units, wherein each heat storage unit comprises a molten salt heat storage body, a solid heat storage body and a heater, the solid heat storage body is formed into at least one hollow flue gas channel, part of the flue gas channels are arranged in the molten salt heat storage body, the plurality of heat storage units are combined together to form an integral heat storage unit group, and the heaters are arranged in the molten salt heat storage body.
Through such structure, become the fused salt heat accumulator of a plurality of small volumes with traditional bulky fused salt heat accumulator, make every fused salt heat accumulator's fused salt volume less to avoid the inhomogeneous problem of fused salt temperature that fused salt temperature layering brought.
Further, the smoke-gas pipeline is also included and penetrates through the channel or is connected with the two ends of the smoke-gas channel.
Through such structure for high temperature flue gas is earlier through carrying out the heat transfer with the heat accumulation brick, then the fused salt in the heat accumulation brick heating fused salt heat accumulator, and the fused salt does not lead to the fact the corruption and the heating of pipeline even with flue gas pipeline direct contact.
Preferably, the plurality of heat storage units are stacked one above the other.
Through the structure, different heat storage requirements can be met through serial connection of the heat storage units. It should be noted that different numbers of heat storage units can be selected as required, the connection mode is simple and flexible, and the invention is not limited to the serial connection mode.
Preferably, the flue gas pipeline exposed outside the heat storage unit is coated with a heat insulation material to reduce heat loss.
Furthermore, the solid heat accumulator is formed by combining a plurality of heat accumulation bricks.
Preferably, the heater is an electric heater.
By the structure, each molten salt heat accumulator is internally provided with the electric heater, and energy can be supplemented in an electric heating mode when the flue gas supply energy is insufficient.
Preferably, the electric heater further comprises a control cabinet, and the terminals of the electric heater are connected to the control cabinet.
Furthermore, a water pipeline is arranged in the molten salt heat accumulator in each heat accumulation unit, and cold water is changed into hot water after heat exchange is carried out between the water pipeline and the molten salt and flows out of the heat accumulation device.
Preferably, the water pipeline is spirally wound on the outer wall surface of the fused salt heat accumulator.
Preferably, the outer wall surface of the heat storage unit group is coated with a heat insulating material.
Through such structure, inlet channel spiral winding is on the wall of solid heat accumulator, and cold water carries out heat transfer with the fused salt in the pipeline, and water is heated and flows out heat accumulation device behind the uniform temperature, obtains the required different hot water temperature of user through the flow of the water of adjusting every heat accumulation unit, and the hot water that every heat accumulation unit flows mixes the back and gets into the heat supply pipeline and supply heat for the user. If the heat of one heat storage unit cannot meet the requirement of a user, the water inlets and the water outlets of two or more heat storage units can be connected in series. The outer wall surface of the heat storage device and the flue gas pipeline are wrapped by heat insulation materials so as to reduce the energy loss.
Compared with the prior art, the flue gas waste heat storage device provided by the invention has the following advantages:
(1) the industrial waste heat is recovered in a mode of combining the heat storage bricks with the molten salt heat storage body, so that the energy utilization rate is greatly improved, and the waste of energy is reduced;
(2) the fused salt is not in direct contact with the flue gas pipeline, so that the corrosion of the pipeline is reduced;
(3) the quantity of molten salt of each molten salt heat accumulator is small, so that the problem of serious molten salt temperature stratification is solved;
(4) the problems of uneven heat transfer and local overheating of the solid brick due to heat storage temperature are solved;
(5) the system has simple structure, convenient operation, low cost, environmental protection, energy conservation and flexible system;
(6) the temperature of the discharged smoke is reduced, so that the direct thermal pollution of the smoke to the environment is reduced, the energy loss of the discharged smoke is greatly reduced, and the operation efficiency of equipment is improved;
(7) the harmful substances discharged into the atmosphere are greatly reduced due to the condensation;
(8) the device has simple structure and small volume, can be well installed under the condition of limited space, is not limited by time in use, has strong adaptability, and can be widely used.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the apparatus and method consistent with the invention and, together with the detailed description, serve to explain the advantages and principles consistent with the invention.
FIG. 1 is a schematic structural diagram of a flue gas waste heat storage device according to a preferred embodiment of the present invention;
FIG. 2 is a side sectional view of the flue gas channel;
FIG. 3 is a schematic structural diagram of a flue gas waste heat storage device according to another preferred embodiment of the present invention;
FIG. 4 is a plan view of a heat accumulator according to a third embodiment of the present invention;
FIG. 5 is a plan view of a heat accumulator according to a fourth embodiment of the present invention.
Description of the reference numerals
1-molten salt heat accumulator
2-electric heater
3-flue gas pipeline
4-solid heat accumulator
5-flue gas inlet
6-flue gas outlet
7-heat storage brick
8-water pipeline
9-flue gas channel
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other, and the technical idea of the present invention may be implemented in combination with other known techniques or other techniques identical to those known techniques.
The terms "first" and "second" as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another, unless otherwise specified. Similarly, modifiers similar to "about", "approximately" or "approximately" that occur before a numerical term herein typically include the same number, and their specific meaning should be read in conjunction with the context. Similarly, unless a specific number of a claim recitation is intended to cover both the singular and the plural, and also that claim may include both the singular and the plural.
In the description of the specific embodiments above, the use of the directional terms "upper", "lower", "left", "right", "top", "bottom", "vertical", "transverse", and "lateral", etc., are for convenience of description only and should not be considered limiting.
Example 1
As shown in fig. 1, a preferred embodiment of the present invention provides a flue gas waste heat storage device, which includes:
a plurality of heat storage units, specifically, three heat storage units in the embodiment.
Wherein each heat storage unit comprises a molten salt heat storage body 1, a solid heat storage body 4 and a heater 2. Fused salt heat accumulator 1 comprises fused salt heat-retaining material and fused salt storage tank, and solid heat accumulator 4 comprises a plurality of solid heat accumulation bricks 7, forms into a hollow flue gas passageway 9, combines 3 heat accumulation units together and forms a whole, and heater 2 sets up in fused salt heat accumulator 1 inside, and evenly arranges all around. The solid heat accumulator 4 is disposed below the molten salt heat accumulator 1.
Through such structure, become the fused salt heat accumulator of a plurality of small volumes with traditional bulky fused salt heat accumulator, make every fused salt heat accumulator's fused salt volume less to avoid the inhomogeneous problem of fused salt temperature that fused salt temperature layering brought.
The connection mode among the three heat storage units is divided into two types:
one type of the heat storage device also comprises a flue gas pipeline 3 which passes through the flue gas channel 9 and connects the three heat storage units into a whole.
And the other one is that each heat storage unit is connected through a flue gas pipeline 3, two ends of each flue gas channel are connected with the flue gas pipeline 3 made of stainless steel or other materials, and the flue gas channel 9 is in air-tight connection with the flue gas pipeline 3, so that the three heat storage units are connected into a whole.
Through such structure for high temperature flue gas is earlier through carrying out the heat transfer with the heat accumulation brick, then the fused salt in the heat accumulation brick heating fused salt heat accumulator, and the fused salt does not lead to the fact the corruption and the heating of pipeline even with flue gas pipeline direct contact.
High temperature flue gas contains a large amount of vapor usually, high temperature flue gas removes moisture wherein through water trap, then get into from heat storage device's bottom flue gas pipeline 5, loop through the flue gas passageway 9 of compriseing heat storage brick 7, the low temperature flue gas after the heat transfer is discharged by upper portion exhanst gas outlet 6, high temperature flue gas is through storing the heat in heat storage brick 7 with heat storage brick 7 heat transfer, heat storage brick 7 carries out the heat transfer through the fused salt of container wall in with fused salt heat accumulator 1, heat the fused salt, the upper and lower two sides (except that the top fused salt heat accumulator) of fused salt heat accumulator 1 all contacts with heat storage brick 7, the fused salt heats evenly and rate of heating is fast, because the fused salt volume in every fused salt heat accumulator 1 is less, the serious problem of the temperature stratification of fused salt in the device has been avoided.
In this embodiment, 3 heat storage units are stacked one on top of another.
Through the structure, different heat storage requirements can be met through serial connection of the heat storage units. It should be noted that different numbers of heat storage units can be selected as required, the connection mode is simple and flexible, and the invention is not limited to the serial connection mode.
In this embodiment, the flue gas duct 3 exposed outside the heat storage unit is coated with a heat insulating material to reduce heat loss.
As shown in fig. 2, the solid heat storage body 4 is formed by combining a plurality of heat storage bricks 7, grooves are arranged in the solid heat storage bricks 7, a plurality of solid heat storage bricks 7 are combined together to form a flue gas channel 9,
in this embodiment, the heater 2 is an electric heater.
By the structure, each molten salt heat accumulator 4 is internally provided with an electric heater, and energy can be supplemented in an electric heating mode when the flue gas supply energy is insufficient.
In this embodiment, the electric heater further comprises a control cabinet (not shown in the figure), and the terminals of the electric heater are all connected to the control cabinet.
In the embodiment, a water pipeline 8 is arranged in the molten salt heat accumulator 1 in each heat accumulation unit, and cold water exchanges heat with molten salt in the water pipeline 8 and then becomes hot water to flow out of the heat accumulation device.
In this embodiment, the water pipe is spirally wound around the outer wall surface of the molten salt heat accumulator 1. In this embodiment, the outer wall surface of the heat storage unit group is coated with a heat insulating material.
Through such structure, inlet channel spiral winding is on fused salt heat accumulator 1 wall of heat accumulation unit, and cold water carries out heat transfer with the fused salt in the pipeline, and water is heated to the heat accumulation device that flows out behind the uniform temperature, and the hot water that every heat accumulation unit flowed out mixes the back and gets into the heat supply pipeline and supply heat for the user.
Example 2
As shown in fig. 3, another preferred embodiment of the present invention provides a flue gas waste heat storage device. The difference from the above embodiment is that:
each heat storage unit comprises a molten salt heat storage body 1, a solid heat storage body 4 and a heater 2, and the solid heat storage body 4 is arranged above the molten salt heat storage body 1. The electric heaters 2 are arranged inside the fused salt heat accumulator 1 and used for supplementing energy, and the heaters 2 are all arranged around the fused salt heat accumulator 1.
In this embodiment, the heat storage bricks are solid magnesia bricks. Each solid magnesite brick is tightly arranged and combined together to form a flue gas channel 9.
Example 3
As shown in fig. 4, the present embodiment is different from the 2 embodiments described above in that each heat storage unit has a plurality of flue gas channels 9 composed of solid heat storage bricks 7, the plurality of channels are connected in parallel, and the flue gas pipes 3 entering and exiting the heat storage unit are all one. The flue gas channel 9 passing through the solid heat accumulator 4 is arranged entirely within the heat accumulation unit. The path of the high temperature flue gas flowing in the flue gas channel 9 is shown by the arrow in fig. 4.
Example 4
As shown in fig. 5, the difference between this embodiment and the above 3 embodiments is that the flue gas channel 3 is divided into a plurality of flue gas pipes 3 connected in parallel by a flue gas pipe before entering the heat storage unit, so that the flue gas pipe 3 entering the heat storage unit is a plurality of flue gas pipes, and the flue gas exchanges heat with the heat storage unit and then joins into a flue gas pipe 3 outside the heat storage unit. The path of the high temperature flue gas flowing in the flue gas channel 9 in the solid heat accumulator 4 is shown by the arrow in fig. 5.
Compared with the prior art, the flue gas waste heat storage device provided by the invention has the following advantages:
(1) the industrial waste heat is recovered in a mode of combining the heat storage bricks with the molten salt heat storage body, so that the energy utilization rate is greatly improved, and the waste of energy is reduced;
(2) the fused salt is not in direct contact with the flue gas pipeline, so that the corrosion of the pipeline is reduced;
(3) the quantity of molten salt of each molten salt heat accumulator is small, so that the problem of serious molten salt temperature stratification is solved;
(4) the problems of uneven heat transfer and local overheating of the solid brick due to heat storage temperature are solved;
(5) the system has simple structure, convenient operation, low cost, environmental protection, energy conservation and flexible system;
(6) the temperature of the discharged smoke is reduced, so that the direct thermal pollution of the smoke to the environment is reduced, the energy loss of the discharged smoke is greatly reduced, and the operation efficiency of equipment is improved;
(7) the harmful substances discharged into the atmosphere are greatly reduced due to the condensation;
(8) the device has simple structure and small volume, can be well installed under the condition of limited space, is not limited by time in use, has strong adaptability, and can be widely used.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (10)
1. The utility model provides a flue gas waste heat storage device, its characterized in that includes a plurality of heat accumulation units, and every heat accumulation unit includes fused salt heat accumulator and solid heat accumulator and heater, the solid heat accumulator forms at least one hollow flue gas passageway, part the flue gas passageway set up in inside the fused salt heat accumulator, will a plurality of the heat accumulation unit forms a whole heat accumulation unit group together, the heater set up in inside the fused salt heat accumulator.
2. The smoke waste heat storage device according to claim 1, further comprising a smoke duct passing through the smoke channel or connected with both ends of the smoke channel.
3. The device for storing heat by using waste heat of flue gas as claimed in claim 1 or 2, wherein a plurality of the heat storage units are stacked up and down.
4. The smoke waste heat storage device according to claim 2, wherein the smoke channel or the smoke pipeline exposed outside the heat storage unit is coated with a heat insulation material to reduce heat loss.
5. The device for storing heat of residual heat of flue gas as claimed in claim 1, wherein the solid heat storage body is formed by combining a plurality of heat storage bricks.
6. The smoke waste heat storage device according to claim 1, wherein the heater is an electric heater.
7. The smoke waste heat storage device according to claim 6, further comprising a control cabinet, wherein the terminals of the electric heater are connected to the control cabinet.
8. The smoke waste heat storage device according to claim 1, wherein a water pipeline is arranged in the molten salt heat storage body in each heat storage unit, and cold water is changed into hot water to flow out of the smoke waste heat storage device after the cold water exchanges heat with molten salt in the water pipeline.
9. The smoke waste heat storage device according to claim 8, wherein the water pipeline is spirally wound on the outer wall surface of the molten salt heat storage body.
10. The smoke waste heat storage device according to claim 1, wherein the outer wall surface of the heat storage unit group is coated with a heat insulation material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010420831.XA CN112113451A (en) | 2020-05-18 | 2020-05-18 | Smoke waste heat storage device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010420831.XA CN112113451A (en) | 2020-05-18 | 2020-05-18 | Smoke waste heat storage device |
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| CN112113451A true CN112113451A (en) | 2020-12-22 |
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| CN202010420831.XA Pending CN112113451A (en) | 2020-05-18 | 2020-05-18 | Smoke waste heat storage device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113701510A (en) * | 2021-06-28 | 2021-11-26 | 四川思达能环保科技有限公司 | Raw material smelting section flue gas treatment device in microcrystalline glass preparation process |
-
2020
- 2020-05-18 CN CN202010420831.XA patent/CN112113451A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113701510A (en) * | 2021-06-28 | 2021-11-26 | 四川思达能环保科技有限公司 | Raw material smelting section flue gas treatment device in microcrystalline glass preparation process |
| CN113701510B (en) * | 2021-06-28 | 2024-03-19 | 四川思达能环保科技有限公司 | Raw material smelting section flue gas treatment device in microcrystalline glass preparation technology |
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