CN107478067A - Heat recovery system - Google Patents
Heat recovery system Download PDFInfo
- Publication number
- CN107478067A CN107478067A CN201710828751.6A CN201710828751A CN107478067A CN 107478067 A CN107478067 A CN 107478067A CN 201710828751 A CN201710828751 A CN 201710828751A CN 107478067 A CN107478067 A CN 107478067A
- Authority
- CN
- China
- Prior art keywords
- heat
- recovery system
- accumulation module
- heat accumulation
- loop
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
- C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/006—Systems for reclaiming waste heat using a boiler
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/007—Systems for reclaiming waste heat including regenerators
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The present invention provides a kind of heat recovery system, and for being reclaimed to the fume afterheat of boiler, it includes heat accumulation module and the first loop.Heat accumulation module carries out heat accumulation using solid heat accumulating, and heat accumulation module is used to store the fume afterheat from boiler recovery；The heat-transfer surface that first loop includes being arranged in the latter end flue of boiler is respectively connecting to heat accumulation module to input heat into heat accumulation module with flue gas cool-down to the first predetermined temperature, the entrance and exit in the first loop that will pass through latter end flue.According to the heat recovery system of the present invention, carrying out heat exchange by the first loop and the flue gas that are arranged in latter end flue makes flue gas further cool, and adds the yield of fume afterheat；Fume afterheat is stored using solid heat accumulating in addition, the energy figure of the fume afterheat of recovery will not be reduced, improve efficiency of utilization, add the form of heat utilization.
Description
Technical field
The present invention relates to a kind of heat recovery system.
Background technology
" OG systems " (the oxygen top-blown converter gas recovery system) that current domestic steel mill generally uses, converter exiting flue gas
Temperature is typically recycled typically at 1600 DEG C or so by residual neat recovering system to the heat of flue gas, can be in converter
Gasification cooling flue export by cigarette temperature drop to 850~900 DEG C, and enter deduster before still need flue-gas temperature being down to
Less than 200 DEG C.This usual process realizes that the heat contained by flue gas is taken away by the water, it is impossible to is accomplished by a large amount of spray coolings
Effectively recycle, this partial fume sensible heat wastes serious.
In addition, conventional flue gas waste heat recovery system is stored using steam accumulator to the heat energy of recovery.Steam stores
Hot device thermal storage time is short, and heat loss is big, can only export less than intake condition saturated vapor (for example inlet steam is 1.6MPa,
Outlet vapor is typically in 0.7MPa or so), it is low for the utilization ratio of waste heat；The steam parameter of accumulator outlet is limited by, it is remaining
Heat utilization form is limited, is only used for plant area's heat supply or saturated vapor generates electricity, both forms belong to poorly efficient energy utilization
Form.
Accordingly, it is desirable to provide a kind of heat recovery system to solve the above problems at least in part.
The content of the invention
A series of concept of reduced forms is introduced in Summary, this will enter in specific embodiment part
One step describes in detail.The Summary of the present invention is not meant to attempt to limit technical scheme claimed
Key feature and essential features, the protection domain for attempting to determine technical scheme claimed is not meant that more.
To solve the above problems at least in part, the present invention provides a kind of heat recovery system, more than the flue gas to boiler
Heat is reclaimed, wherein, the heat recovery system includes：
Heat accumulation module, the heat accumulation module using solid heat accumulating carry out heat accumulation, the heat accumulation module be used for store from
The fume afterheat of the boiler recovery；With the first loop, first loop includes being arranged in the latter end flue of the boiler
Heat-transfer surface with by by the flue gas cool-down of the latter end flue to the first predetermined temperature, the entrance and exit in first loop
The heat accumulation module is respectively connecting to input heat into the heat accumulation module.
Alternatively, the heat accumulation pattern of the heat accumulation module also includes phase-change thermal storage.
Alternatively, first loop includes the heat exchange of heat pipe being arranged in the latter end flue.
Alternatively, the working medium that first loop uses is water or conduction oil.
Alternatively, the heat recovery system also includes second servo loop, and the second servo loop includes being arranged in the boiler
Heat-transfer surface in interlude flue is extremely more than first predetermined temperature will pass through the flue gas cool-down of the interlude flue
Second predetermined temperature, the entrance and exit of the second servo loop are respectively connecting to the heat accumulation module with into the heat accumulation module
Input heat.
Alternatively, the scope of second predetermined temperature is 850~900 DEG C.
Alternatively, the scope of first predetermined temperature is 350~630 DEG C.
Alternatively, the heat recovery system also includes tertiary circuit, and the outlet of the tertiary circuit and entrance connect respectively
To the heat accumulation module to absorb heat from the heat accumulation module.
Alternatively, the tertiary circuit is used to energize for steam turbine or Ladle-casting apparatus.
Alternatively, the heat recovery system is applied to oxygen top-blown converter.
According to the heat recovery system of the present invention, the first loop is disposed with the latter end flue of boiler, passes through heat pipe heat exchanging
Device is exchanged heat with flue gas, to the flue gas cool-down in the flue of end, adds the yield of fume afterheat；Use solid material in addition
The fume afterheat of recovery is stored in heat accumulation module by the technology of material heat accumulation by heat exchange, can produce the continuous of more high parameter
Steam or other hot fluids, will not reduce the energy figure of the fume afterheat of recovery, improve efficiency of utilization, add hot profit
Form.
Brief description of the drawings
The drawings below of embodiment of the present invention is used to understand the present invention in this as the part of the present invention.Show in accompanying drawing
Embodiments of the present invention and its description are gone out, for explaining the principle of the present invention.In the accompanying drawings,
Fig. 1 is the gasification cooling flue schematic diagram of common oxygen top-blown converter gas recovery system；
Fig. 2 is the schematic diagram according to the heat recovery system of the first embodiment of the present invention；And
Fig. 3 is the schematic diagram according to the heat recovery system of second embodiment of the present invention.
Embodiment
In the following description, a large amount of concrete details are given to provide more thorough understanding of the invention.So
And it will be apparent to one skilled in the art that embodiment of the present invention can be without one or more of these thin
Save and be carried out.In other examples, in order to avoid obscuring with embodiment of the present invention, for well known in the art
Some technical characteristics are not described.
In order to thoroughly understand embodiment of the present invention, detailed structure will be proposed in following description.Obviously, it is of the invention
The execution of embodiment is not limited to the specific details that those skilled in the art is familiar with.
In steel industry, current more than 80% output of steel is refined by oxygen top-blown converter, and equipped with oxygen
Top-blown converter gas recovery system (OG systems) reclaims to the gases such as the coal gas in production technology (hereinafter referred to as flue gas).OG
For the converter exit gas temperature of system typically at 1600 DEG C or so, containing has substantial amounts of heat energy, and this partial heat energy is reclaimed
Energy utilization efficiency can be greatly improved.
With reference to Fig. 1~Fig. 3 to being described in detail according to the heat recovery system of the present invention.
As shown in figure 1, the schematic diagram of the gasification cooling flue 10 for OG systems, its can substantially be divided into movable gas hood 11,
Fire door fixes flue 12, interlude flue 13 and the part of latter end flue 14 4.Movable gas hood 11 is connected with oxygen top-blown converter, is risen
To collecting and guide the effect of flue gas.Flue gas flows through fire door and fixes flue 12, interlude flue 13 and latter end flue 14, warp successively
Cross cooling and enter deduster dedusting afterwards, then carry out the processes such as follow-up gas collection or discharge as needed.Institute of the present invention
The heat recovery system shown, arrangement heat-transfer surface reclaims to fume afterheat in interlude flue 13 and latter end flue 14.
As shown in Fig. 2 the schematic diagram of the heat recovery system 100 for the first embodiment according to the present invention, mainly includes
Heat accumulation module 110, the first loop 101, second servo loop 102, tertiary circuit 103, steam turbine 120 and generator 130.Wherein,
The heat-transfer surface of secondary circuit 102 is arranged in interlude flue 13, for flue gas to be cooled into the second predetermined temperature by heat exchange, the
The heat-transfer surface of primary Ioops 101 is arranged in latter end flue 14, for flue gas to be cooled into the first predetermined temperature by heat exchange.When
So, it will be understood that the second predetermined temperature is more than the first predetermined temperature.In the present embodiment, the scope of the second predetermined temperature is
850~900 DEG C, the scope of the first predetermined temperature is 350~630 DEG C.So, flue gas can be tried one's best before deduster is entered
It is down to relatively low temperature and waste heat is reclaimed, so as to increases the yield of waste heat.Due to the flue gas in latter end flue 14
Temperature is relatively low, it is preferable that heat-transfer surface of first loop 101 in latter end flue 14 uses heat exchange of heat pipe 108.Heat pipe changes
Hot device has more excellent heat exchange property compared to ordinary heat exchanger, can so greatly improve the first loop 101 and latter end flue
Heat exchange efficiency between the relatively low flue gas of temperature in 14, optimize the effect of recuperation of heat.
First loop 101 and second servo loop 102 are respectively connecting to heat accumulation module 110, heat accumulation module 110 by with first time
Road 101 and second servo loop 102 are exchanged heat, and are returned what the working medium in the first loop 101 and second servo loop 102 was contained from flue gas
The exhaust-heat absorption of receipts and storage.Tertiary circuit 103 is connected to heat accumulation module 110, and the working medium in tertiary circuit 103 absorbs heat accumulation mould
In block 110 after the heat of storage, other application modules for needing heat energy to supply are delivered to.In the present embodiment, tertiary circuit
103 be carbonated drink electricity generation system, and working medium therein is water, and the water in tertiary circuit 103 is changed into steaming in the presence of heat accumulation module 110
Vapour is delivered to steam turbine 120, is rotated for driving steam turbine 120, to drive generator 130 to be generated electricity, so as to realize waste heat
Recycling.
Heat accumulation module 110 uses TES (Thermal Energy Storage) heat-storage technology.TES heat-storage technologies are with solid
Heat-storage technology based on body heat accumulating, it mainly has the characteristics of good sensible heat heat storage capacity using solid material, and
Solid material is embedded in heat transfer fluid conduit to form heat accumulation module.To solid material heat release when high temperature refrigerant flows through heat accumulation module
So that by heat storage, in heat accumulation module, cryogenic fluid absorbs heat with out of by heat accumulation module when flowing through heat accumulation module from solid material
The heat output of storage.By taking solid concrete heat accumulation as an example, the embedded heat transfer fluid conduit in concrete material, pass through during heat accumulation
Flowing of the high temperature refrigerant in pipe, heat is passed to concrete material in time and stored, cryogenic fluid is reverse during heat release
Flowing, the heat stored in concrete is swapped out and supplies heat user.Preferably, the heat accumulating in heat accumulation module can also wrap
The heat accumulating for being capable of phase transformation is included, further increases the quantity of heat storage of heat accumulation module by latent heat during heat accumulating phase transformation.
Compared to the steam accumulator of routine, 110 no saturated vapor of heat accumulation module is changed into saturation water and stored, then passes through
Flash distillation is changed into the link that saturated vapor carries out heat energy output.Therefore, the quality of exported energy will not be reduced.That is, defeated
In the case of the form of energy and parameter identical that enter, the parameter of the steam in tertiary circuit 103 is higher than steam accumulator output
The parameter (such as higher pressure and temperature) of steam, the mechanical efficiency of parameter higher steam is higher, and application scenario is more extensive,
Which thereby enhance the utilization ratio of waste heat.
Due to carrying out heat accumulation using heat accumulation module 110, therefore the working medium in the first loop 101 and second servo loop 102 can be with
There are diversified forms, such as water or conduction oil etc..Those skilled in the art can be had according to actual conditions and application scenario
Body selects.
In the present embodiment, second servo loop 102 is used as working medium using water.Second servo loop 102 can include drum 104, the
One path 105, alternate path 106 and third path 107.Wherein, drum 104 plays a part of steam-water separation, and to flow
Fluctuate into row buffering.The entrance and exit of first path 105 is respectively connecting to the water side of heat accumulation module 110 and drum 104, is used for
Water is delivered to drum 104 from heat accumulation module 110.The entrance and exit of alternate path 106 is respectively connecting to the water side of drum 104
Gentle side, alternate path 106, which has, is arranged in heat-transfer surface in interlude flue 13, for by the water in drum 104 with it is middle
Flue gas in section flue 13 is exchanged heat to carry out waste heat recovery.The entrance and exit of third path 107 is respectively connecting to drum
104 gas side and heat accumulation module 110, there is the steam from the waste heat of off-gas recovery to be delivered to heat accumulation module 110 for that will contain, from
And the waste heat of recovery is stored in heat accumulation module 110.Thus, quality can be provided by such arrangement, second servo loop 102
The preferably saturated vapor of (parameter stability, and not aqueous), is advantageous to be exchanged heat in heat accumulation module 110 to store up waste heat
Deposit.
As shown in figure 3, the schematic diagram for the heat recovery system 200 according to second embodiment of the present invention.Itself and basis
Structure of the heat recovery system 100 of first embodiment in the part that waste heat recovery is carried out with flue gas heat exchange is identical, for style of writing letter
Clean, here is omitted, and only difference part is described in detail.
In the present embodiment, tertiary circuit 203 is respectively connecting to heat accumulation module 210 and heat exchanger 220.Tertiary circuit
Working medium in 203 can be water or conduction oil or other suitable working fluids.In addition, heat recovery system 200 also includes the 4th
Loop 204.4th loop 204 is connected to heat exchanger 220, and working medium therein is air.In heat exchanger 220, tertiary circuit 203
Interior working medium is exchanged heat with the air in the 4th loop 204, and air heating is changed into hot-air.Heat in 4th loop 204
Air can be used for the heating process of Ladle-casting apparatus 230 in process for making.Enter the air themperature of burner due to improving, so as to
The consumption of coal gas can be significantly reduced, realizes the recycling to fume afterheat.
Above to being illustrated according to the heat recovery system of the present invention, it being understood, however, that according to the present invention's
Heat recovery system, can also be applied to other steam generator systems in addition to oxygen top-blown converter, more than its flue gas for reclaiming and storing
Heat can also be applied to other occasions, such as heating etc., however it is not limited to it is above-described to utilize form.In addition, according to
The heat-transfer working medium that each loop of the heat recovery system of the present invention is applied, can be water or conduction oil etc., or other
Heat-transfer fluid.Those skilled in the art can be specifically chosen according to actual conditions.
According to the heat recovery system of the present invention, redesigned by the afterbody (i.e. latter end flue) to gasification cooling flue,
Increase heat exchange of heat pipe so that the temperature of flue gas further declines, and increases the yield of obvious heat of smoke；And use special solid
The heat-storage technology of heat accumulating replaces steam accumulator, and obvious heat of smoke is stored in heat accumulation module by exchanging heat, and can
The continuous steam or other hot fluids for producing more high parameter supply production and application, will not reduce the quality from the waste heat of off-gas recovery,
The utilization form of waste heat is added, improves energy utilization efficiency.
Unless otherwise defined, technology used herein and scientific terminology and the those skilled in the art of the present invention
The implication being generally understood that is identical.Term used herein is intended merely to describe specifically to implement purpose, it is not intended that limitation is originally
Invention.Terms such as herein presented " settings " can both represent that a part was attached directly to another part, also may be used
To represent that a part is attached to another part by middleware.The feature that describes in one embodiment can be with herein
Individually or with further feature be applied to another embodiment in combination, unless this feature in another embodiment not
It is applicable or is otherwise noted.
The present invention is illustrated by above-mentioned embodiment, but it is to be understood that, above-mentioned embodiment is
For the purpose illustrated and illustrated, and it is not intended to limit the invention in the range of described embodiment.Art technology
Personnel are it is understood that can also make more kinds of variants and modifications according to the teachings of the present invention, these variants and modifications
All fall within scope of the present invention.
Claims (10)
- A kind of 1. heat recovery system, for being reclaimed to the fume afterheat of boiler, it is characterised in that the heat recovery system bag Include：Heat accumulation module, the heat accumulation module carry out heat accumulation using solid heat accumulating, and the heat accumulation module is used to store from described The fume afterheat of boiler recovery；First loop, first loop include the heat-transfer surface that is arranged in the latter end flue of the boiler will pass through the end Flue gas cool-down to the first predetermined temperature, the entrance and exit in first loop of section flue is respectively connecting to the heat accumulation module To input heat into the heat accumulation module.
- 2. heat recovery system according to claim 1, it is characterised in that the heat accumulation pattern of the heat accumulation module also includes phase Become heat accumulation.
- 3. heat recovery system according to claim 1, it is characterised in that first loop includes being arranged in the latter end Heat exchange of heat pipe in flue.
- 4. heat recovery system according to claim 1, it is characterised in that the working medium that first loop uses is water or led Deep fat.
- 5. heat recovery system according to claim 1, it is characterised in that the heat recovery system also includes second servo loop, The heat-transfer surface that the second servo loop includes being arranged in the interlude flue of the boiler is with by by the interlude flue Flue gas cool-down to the second predetermined temperature for being more than first predetermined temperature, the entrance and exit of the second servo loop connects respectively To the heat accumulation module to input heat into the heat accumulation module.
- 6. heat recovery system according to claim 5, it is characterised in that the scope of second predetermined temperature be 850~ 900℃。
- 7. heat recovery system according to claim 6, it is characterised in that the scope of first predetermined temperature be 350~ 630℃。
- 8. heat recovery system according to claim 1, it is characterised in that the heat recovery system also includes tertiary circuit, The outlet of the tertiary circuit and entrance are respectively connecting to the heat accumulation module to absorb heat from the heat accumulation module.
- 9. heat recovery system according to claim 8, it is characterised in that the tertiary circuit is used for for steam turbine or roasting bag Device energizes.
- 10. heat recovery system according to claim 1, it is characterised in that the heat recovery system is applied to oxygen top blown Converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710828751.6A CN107478067A (en) | 2017-09-14 | 2017-09-14 | Heat recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710828751.6A CN107478067A (en) | 2017-09-14 | 2017-09-14 | Heat recovery system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107478067A true CN107478067A (en) | 2017-12-15 |
Family
ID=60584049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710828751.6A Pending CN107478067A (en) | 2017-09-14 | 2017-09-14 | Heat recovery system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108757075A (en) * | 2018-06-28 | 2018-11-06 | 思安新能源股份有限公司 | A kind of surplus energy utility electricity generation system |
| WO2020181676A1 (en) * | 2019-03-11 | 2020-09-17 | 西安交通大学 | Auxiliary system for denitration in all working conditions and operation method |
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