CN101128567A - Apparatus for drying wet raw material - Google Patents
Apparatus for drying wet raw material Download PDFInfo
- Publication number
- CN101128567A CN101128567A CNA2006800057291A CN200680005729A CN101128567A CN 101128567 A CN101128567 A CN 101128567A CN A2006800057291 A CNA2006800057291 A CN A2006800057291A CN 200680005729 A CN200680005729 A CN 200680005729A CN 101128567 A CN101128567 A CN 101128567A
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- China
- Prior art keywords
- gas
- bed dryer
- fluid bed
- raw material
- heat storage
- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
- F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
- C10B57/10—Drying
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/001—Heating arrangements using waste 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Microbiology (AREA)
- Sustainable Development (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Drying Of Solid Materials (AREA)
- Coke Industry (AREA)
Abstract
An apparatus for drying a wet raw material having a fluidized bed dryer (9) for drying the wet raw material and a gas-supplying piping (5) for supplying a high temperature exhaust gas from a coke furnace (1) to the fluidized bed dryer (9) as a heat source and a fluidizing gas, wherein a heat storage section (7) is provided in the gas-supplying piping (5).
Description
Technical field
The present invention relates to by fluid bed dryer being enclosed in the drying installation that wet raw materials such as coal in the pit kiln carry out the exsiccant wet raw material.
Background technology
When producing coke,, before being encased in pit kiln, loading coal is carried out drying for the quality that improves coke and the productivity in pit kiln.Pit kiln is generally about 9～13% before drying with the moisture that contains of coal, is 5～6% but by coal drier this coal is dried to moisture.
It is known for a long time using fluid bed dryer in the drying of this coal, discloses the flue gas of pit kiln is imported in the fluid bed dryer method with moisture-free coal as the thermal source fluidization gas of holding concurrently in patent documentation 1.
Here, pit kiln has 2 combustion gases systems usually in each stove group, when reach the specified time duration of service of a system, then switch to another system.The switching of system is carried out with each 15 minutes～30 minutes frequency usually.When switching the combustion gases system, as shown in Figure 4, reduce gradually up at present also at the combustion gas flow of the system (system A) that uses, in case flow reaches zero, then increase the combustion gas flow of the system (system B) that next uses gradually.Therefore, when switching the combustion gases system, the flue gas amount of pit kiln reduces, and reaches zero, and then increases.The needed time of the switching of combustion gases system is generally 2～3 minutes.
Like this, when the flue gas of pit kiln is held concurrently fluidization gas when utilizing as the thermal source of fluid bed dryer, when switching the combustion gases system of pit kiln, because the flue gas amount of pit kiln reduces, therefore in the technology of above-mentioned patent documentation 1, when the supply of the flue gas of pit kiln stops or reducing, by will from fluid bed dryer, the expellant gas circulation utilizing once more, thereby can keep the flow state of fluidized-bed with the fluidization gas of holding concurrently as the thermal source of fluid bed dryer.
But, expellant gas from fluid bed dryer is owing to be to use gas afterwards in the drying of coal dust, therefore the temperature of gas is more much lower than the temperature of the flue gas of pit kiln certainly, thereby when switching the combustion gases system of pit kiln, shown in the hypomere of Fig. 4, the gas temperature that flow in the fluidized-bed of fluid bed dryer reduces.As a result, there are the ridity reduction of wet raw material, the problem of change.
To this, consider that also hot blast is set in addition produces stove etc., when switching the combustion gases system by making it burn to replenish insufficient heat, but, the switching of the combustion gases system of pit kiln is generally each 15 minutes～30 minutes as mentioned above, and, its needed time was as short as about 2～3 minutes, and the dry necessary heat that therefore each running hot blast generation stove replenishes wet raw material is unpractical.
Patent documentation 1: TOHKEMY 2001-55582 communique
Summary of the invention
Thereby the temperature that problem to be solved by this invention is to provide the thermal source that can stably keep being supplied to fluid bed dryer to hold concurrently fluidization gas can be kept the drying installation of wet raw material of the ridity of wet raw material well.
The drying installation of wet raw material of the present invention has: the fluid bed dryer of dry wet raw material and be used for and will supply to the gas supplying tubing of fluid bed dryer as the thermal source fluidization gas of holding concurrently from the high-temperature exhaust air of pit kiln, it is characterized in that the above-mentioned gas supplying tubing is provided with heat storage unit.
Can also further be provided in the drying installation of wet raw material of the present invention expellant gas from fluid bed dryer circulated once more and supply to gas circulation pipe arrangement in the fluid bed dryer; And the gas circulation system control device, this control device is according to controlling from the fluid bed dryer expellant gas mode that reuses with the fluidization gas of holding concurrently as the thermal source of fluid bed dryer that circulates when the supply from the high-temperature exhaust air of above-mentioned pit kiln stops or reducing; And, the circulate downstream end of pipe arrangement of above-mentioned gas is connected with the upstream side of the heat storage unit of above-mentioned gas supplying tubing.
Among the present invention, owing to be provided with heat storage unit being used for the fluidization gas of holding concurrently as thermal source from the high-temperature exhaust air of pit kiln is supplied on the gas supplying tubing of fluid bed dryer, when therefore for example the flue gas of pit kiln being held concurrently the use of fluidization gas as thermal source, even if when switching the combustion gases system of pit kiln, the lower gas of temperature of discharging from fluid bed dryer is recycled, also can replenish insufficient heat when the heat storage unit by the gas supplying tubing, the temperature of fluidization gas reduces thereby the thermal source that can avoid being supplied to fluid bed dryer is held concurrently.
As mentioned above, according to the present invention, the thermal source that can stably keep the being supplied to fluid bed dryer temperature of fluidization gas of holding concurrently, thus can prevent reduction, the change of the ridity of the wet raw material that fluid bed dryer causes.
Description of drawings
Fig. 1 is the summary pie graph of an embodiment of expression drying installation of the present invention.
Fig. 2 is the figure of the switching condition of the burning and gas-exhausting system of expression pit kiln of the present invention.
Fig. 3 A is the figure of the configuration example of expression heat storage unit.
Fig. 3 B is the figure of the configuration example of expression heat storage unit.
Fig. 3 C is the figure of the configuration example of expression heat storage unit.
Fig. 4 is the figure of the switching condition of the burning and gas-exhausting system of pit kiln in the expression prior art.
Embodiment
Following according to the present invention being applicable to pit kiln with the embodiment in the drying of coal dust (following only be called " coal dust "), illustrates embodiments of the present invention.
Fig. 1 is the summary pie graph of an embodiment of expression drying installation of the present invention.
In Fig. 1, the burning and gas-exhausting of the pit kiln that produces in pit kiln 1 is discharged into the atmosphere from pit kiln chimney 3 by flue 2 backs.The temperature of the flue gas 4 by flue 2 is about 150～250 ℃.
The gas supplying tubing 5 of coming out from flue 2 branches of pit kiln is flow through in flue gas 4, after gas blower 6 pressurizations, via heat storage unit 7 as the thermal source underfeed of fluidization gas 8 of holding concurrently from fluid bed dryer 9.The exhaust 10 of discharging from fluid bed dryer 9 is discharged into the atmosphere from chimney 14 via suction cleaner 12, gas blower 13 backs by exhaust pipe arrangement 11.
And, branch out gas circulation pipe arrangement 15 from exhaust pipe arrangement 11, make can ciculation fluidized bed dryer 9 exhaust 10 to use as the thermal source of the fluid bed dryer 9 fluidization gas 8 of holding concurrently once more.The downstream end 15a of gas circulation pipe arrangement 15 is connected with the upstream side of the heat storage unit 7 of gas supplying tubing 5.
Coal dust as wet raw material is loaded in the fluid bed dryer 9 by charge chute 16, and the upwelling that forms by the fluidization gas 8 of being held concurrently by the above-mentioned thermal source that imports from fluid bed dryer 9 bottoms forms fluidized-bed 17.Carry out the drying of coal dust in this fluidized-bed 17, coal dust is discharged by blow tank 18 after being adjusted to the temperature of regulation and water ratio.
In the flue 2 of above-mentioned pit kiln, be provided with the pit kiln exhaust regulating valve 20 of the flue pressure of exhaust flow-meter 19 and adjusting pit kiln 1, gas supplying tubing 5 is provided with under meter 21 and the 1st variable valve 22, exhaust pipe arrangement 11 is provided with the 2nd variable valve 23, and gas circulation pipe arrangement 15 is provided with the 3rd variable valve 24.Exhaust flow-meter 19 is not essential, can calculate by burning yet and infer extraction flow.The the 1st～the 3rd variable valve 22～24 can be regulated aperture or flow by variable valve control device 25～27 respectively.And, gas circulation system control device 28 also is set, to each control device 25～27 output steering order of the 1st～the 3rd variable valve 22～24, thereby carry out the control of the circulation gas scale of construction.
In the present embodiment, when the supply of the flue gas of pit kiln stopped or reducing, the exhaust that will discharge from fluid bed dryer 9 circulated via gas circulation pipe arrangement 15, and reused as the thermal source of the drying machine 9 that the flows fluidization gas of holding concurrently.See figures.1.and.2, specific description is as described below.
The 3rd variable valve 24 that is configured on the gas circulation pipe arrangement 15 is closed fully when steady operation or opens slightly.Promptly, when works better, if the flue gas temperature of pit kiln is too high, then slightly the recycle gas of mixing low temp so that gas temperature reduces is effective, in addition, also can use recycle gas during the drying power when adjusting the moisture change of the coal dust supplied with.
When beginning to switch the combustion gases system of pit kiln, the 3rd variable valve 24 is opened to certain aperture from complete closure or the state opened slightly.As a result, by the effect of gas blower 6 and gas blower 13, recycle gas 29 flows through gas circulation pipe arrangement 15 and produces recirculation flow.Guarantee slowly to reduce the aperture of the 1st variable valve 22 for a certain amount of moment at the flow of recycle gas 29.As a result, the flue gas 4 that before supplies in the fluid bed dryer 9 slowly reduces, and the flow to pit kiln chimney 3 increases on the contrary.The breaker acting speed of the 1st variable valve 22 is also nonessential certain, because burning and gas-exhausting amount (flue gas amount) is along with the operating rate of pit kiln 1 or the state of combustion of pit kiln 1 change, so must determine respectively according to the operating conditions of pit kiln 1.
The control of the 1st～the 3rd variable valve 22～24 is according to the instruction from gas circulation system control device 28, and each variable valve control device 25～27 each variable valve of control carries out.Certainly, gas circulation system control device 28 part or all with each variable valve control device 25～27 can also be incorporated in the single control machine.In addition, each variable valve control device can also in be contained in separately the variable valve.
When switching the combustion gases system of pit kiln, will can adopt to the beginning of the control of fluid bed dryer 9 gas supplied changes and receive the method that begins to switch the method that begins behind the signal of combustion gases system, begin according to the fluctuations in discharge of the exhaust flow-meter 19 of flue 2 etc. from the pit kiln side joint.And, as shown in Figure 2, more preferably before beginning to switch the certain hour of combustion gases system, receive the precognition signal, and begin control break to fluid bed dryer 9 gas supplied according to this precognition signal from pit kiln 1.For example, receive the precognition signal before the flue gas flow reaches zero 1 minute, beginning is via the gas re-circulation of gas circulation pipe arrangement 15.Thus, uninterrupted gas re-circulation, thus avoid to the insufficient situation of fluid bed dryer 9 gas supplied amounts (thermal source hold concurrently fluidization gas volume).
Employed recycle gas 29 when switching the combustion gases system of pit kiln is owing to be gas after using in the drying of the coal dust of fluid bed dryer 9, so the temperature of gas is lower than the flue gas 4 of pit kiln certainly.
To this, among the present invention, be used for being provided with heat storage unit 7 to the gas supplying tubing 5 of fluid bed dryer supply gas.This heat storage unit 7 is accumulated the sensible heat of flue gas 4 when works better, when cryogenic recycle gas 29 passes through when switching the combustion gases system of pit kiln, give the heat of being accumulated and replenish insufficient heat.Therefore, the accumulation of heat energy by adjusting heat storage unit 7, length etc., even if supplied with cryogenic recycle gas 29, also can be shown in the hypomere of Fig. 2, the temperature of avoiding flowing into the gas (thermal source hold concurrently fluidization gas) of fluidized-bed reduces, change.
Fig. 3 A～C represents the configuration example of heat storage unit.
When the length of heat storage unit is insufficient, shown in Fig. 3 B,, can increases the heat storage capacity of per unit length, and shorten the length of heat storage unit by the next door 7b that is made by refractory body is set.At this moment, next door 7b for having the structure of inclination in upstream side and downstream side with respect to air-flow, thereby can prevent that next door 7b is subjected to abrasion, the damage with respect to air-flow as shown in the figure.In addition, if consider the pressure-losses that heat storage unit is interior, then the amassing of the quantity n in the width t in next door and next door is preferably t * n＜0.5D.
And then, in order to increase heat transfer area, when shown in Fig. 3 C, reducing the height of next door 7b, in order to prevent the bias current of gas, the length S1 in gap that preferably will be from 7b upper surface, next door to heat storage unit 7 inner peripheral surfaces set for respect to next door 7b and adjacent next door 7b or with the length S2 in the gap of heat storage unit 7 inner peripheral surfaces be 0.5S2＜S1＜1.5S2.
The present invention is not limited only to be encased in the drying of the coal dust in the pit kiln, can also be applicable in the drying of other wet raw materials such as granulated slag, Wingdale.
Claims (5)
1. the drying installation of wet raw material, it has: the fluid bed dryer of dry wet raw material and be used for and will supply to the gas supplying tubing of fluid bed dryer as the thermal source fluidization gas of holding concurrently from the high-temperature exhaust air of pit kiln, it is characterized in that described gas supplying tubing is provided with heat storage unit.
2. the drying installation of the described wet raw material of claim 1, it has: be used for and will circulate once more from described fluid bed dryer expellant gas and supply to gas circulation pipe arrangement the described fluid bed dryer; And the gas circulation system control device, control by the mode that reuses with the fluidization gas of holding concurrently as the thermal source of described fluid bed dryer according to circulating from described fluid bed dryer expellant gas when the supply from the high-temperature exhaust air of described pit kiln stops or reducing for this control device; And, the downstream end of described gas circulation pipe arrangement is connected with the upstream side of the described heat storage unit of described gas supplying tubing.
3. the drying installation of the described wet raw material of claim 1 is characterized in that, described heat storage unit forms round shape by refractory body.
4. the drying installation of the described wet raw material of claim 3 is characterized in that, described heat storage unit also has the next door of being made by refractory body.
5. the drying installation of the described wet raw material of claim 4 is characterized in that, is formed with the gap between the inner peripheral surface of the upper end in described next door of being made by refractory body and described heat storage unit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP047699/2005 | 2005-02-23 | ||
| JP2005047699A JP2006232938A (en) | 2005-02-23 | 2005-02-23 | Apparatus for drying wet raw material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101128567A true CN101128567A (en) | 2008-02-20 |
Family
ID=36927256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006800057291A Pending CN101128567A (en) | 2005-02-23 | 2006-02-15 | Apparatus for drying wet raw material |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2006232938A (en) |
| CN (1) | CN101128567A (en) |
| TW (1) | TW200641109A (en) |
| WO (1) | WO2006090615A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101974344A (en) * | 2010-11-12 | 2011-02-16 | 中冶焦耐(大连)工程技术有限公司 | Drying process for humidifying coals by using coke oven flue gas and device |
| CN102759118A (en) * | 2011-04-29 | 2012-10-31 | 中国电力工程顾问集团华北电力设计院工程有限公司 | Lignite drum smoke pre-drying power generation integrated system and process |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4787528B2 (en) * | 2005-04-08 | 2011-10-05 | 新日鉄エンジニアリング株式会社 | Wet raw material drying apparatus and drying method |
| JP5410633B1 (en) * | 2013-06-13 | 2014-02-05 | 新日鉄住金エンジニアリング株式会社 | Drying apparatus and drying method using the drying apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6031592A (en) * | 1983-07-25 | 1985-02-18 | Nippon Steel Corp | Drying and classification of coal by utilizing coke oven waste gas |
| JPH10111077A (en) * | 1996-10-07 | 1998-04-28 | Tsuneo Ito | Heater for drying chamber |
| JP3825587B2 (en) * | 1999-08-18 | 2006-09-27 | 新日本製鐵株式会社 | Coal drying method and drying apparatus |
-
2005
- 2005-02-23 JP JP2005047699A patent/JP2006232938A/en active Pending
-
2006
- 2006-02-15 CN CNA2006800057291A patent/CN101128567A/en active Pending
- 2006-02-15 WO PCT/JP2006/302601 patent/WO2006090615A1/en active Application Filing
- 2006-02-20 TW TW095105582A patent/TW200641109A/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101974344A (en) * | 2010-11-12 | 2011-02-16 | 中冶焦耐(大连)工程技术有限公司 | Drying process for humidifying coals by using coke oven flue gas and device |
| CN101974344B (en) * | 2010-11-12 | 2013-08-07 | 中冶焦耐(大连)工程技术有限公司 | Drying process for humidifying coals by using coke oven flue gas and device |
| CN102759118A (en) * | 2011-04-29 | 2012-10-31 | 中国电力工程顾问集团华北电力设计院工程有限公司 | Lignite drum smoke pre-drying power generation integrated system and process |
Also Published As
| Publication number | Publication date |
|---|---|
| TW200641109A (en) | 2006-12-01 |
| WO2006090615A1 (en) | 2006-08-31 |
| JP2006232938A (en) | 2006-09-07 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080220 |