CN102102944A - Flue gas waste heat recovery method for rotary kiln - Google Patents
Flue gas waste heat recovery method for rotary kiln Download PDFInfo
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- CN102102944A CN102102944A CN2009103066226A CN200910306622A CN102102944A CN 102102944 A CN102102944 A CN 102102944A CN 2009103066226 A CN2009103066226 A CN 2009103066226A CN 200910306622 A CN200910306622 A CN 200910306622A CN 102102944 A CN102102944 A CN 102102944A
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- rotary kiln
- flue gas
- heat exchanger
- waste heat
- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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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
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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Abstract
The invention discloses a flue gas waste heat recovery method for a rotary kiln, wherein the method can be used for realizing the efficient and reliable waste heat resource recovery of the rotary kiln. The method is characterized in that the flue gas of a rotary kiln 1 is introduced into waste heat recovery heat exchangers 2 and 3, the heat exchangers absorb the heat in the flue gas up to the hilt, and the waste heat is utilized after being transformed into the enthalpy values of liquid, gas and steam; a flue gas steady flow system 4 is connected at the flue gas outlet of the heat exchanger 3 in series, the flue gas steady flow system 4 can perform automatic regulation according to the thermal regulation of the rotary kiln 1, so that the change brought by additionally arranging the waste heat recovery heat exchangers 2 and 3 can be overcome, and the different temperature field and pressure field parameters of the rotary kiln 1 under different working conditions can be maintained; and the rotary kiln 1 is also provided with a radiation heating surface which can absorb high-temperature radiant heat so as to reduce the heat dissipation of the rotary kiln 1 and recover the waste heat in all directions, thereby most comprehensively recovering the waste heat up to the hilt, and simultaneously ensuring that the rotary kiln operates stably, parameters have no need to be changed and can not be changed, and the quality of produced products is not influenced at all.
Description
Technical field
The present invention relates to a kind of preroast rotary kiln flue gas waste heat recovery method that is used for
Background technology
The sintering process of ferrite prefiring material in rotary kiln is the key that guarantees the permanent-magnet ferrite product quality, in order to guarantee the quality of product, the production firm of each ferrite prefiring material is that the pre-burning system of main equipment is when carrying out the permanent magnetic ferrite magnetic powder sintering technology adopting with the rotary kiln, the essential strict accurate requirement of carrying out technology to sintering process, for this reason, the fume afterheat of the rotary kiln pre-burning system of each permanent-magnet ferrite manufacturer is rarely recycled, but adopts the direct discharging modes of high temperature.Because the flue-gas temperature too high (generally up to 900 ℃) of some rotary kiln pre-burning systems is had to adopt air blast to introduce normal temperature air and is mixed, and reduces flue-gas temperature, to reduce the smoke evacuation system investment and to prolong the smoke evacuation system life-span.The flue gas waste heat recovery engineering major programme of rare rotary kiln pre-burning system as shown in Figure 2, it is directly to install a heat recovery heat exchanger 16 on the smoke evacuation pipeline of rotary kiln pre-burning system additional, flue gas is directly discharged by the back segment chimney behind heat recovery heat exchanger.1., increase rotary kiln pre-burning system smoke evacuation resistance there is following defective in design like this:, cause the smoke evacuation difficulty, pressure field, temperature field in the rotary kiln change, and influence the pre-burning effect, and permanent-magnet ferrite opaque amount can be affected; 2., " robbing thermal phenomenon " appears, promptly after installing heat recovery heat exchanger additional on the rotary kiln pre-burning system discharge flue, under the identical situation of rotary kiln input heat, the decline situation appears in kiln temperature, does not reach the technological requirement temperature; 3., can't recycle fume afterheat to greatest extent.On the one hand often contain the composition that is corrosive in the pre-burning rotary kiln flue gas,, cold end corrosion takes place easily, therefore want heat recovery heat exchanger to have the temperature resistance corrosive nature as sulphur etc.; It is higher to turn round pre-burning rotary kiln discharging flue-gas temperature on the other hand, can reach 900 ℃ usually, high temperature resistant to require heat recovery heat exchanger, and a kind of heat exchanger that can have these two functions is not well simultaneously now arranged yet; 4., can't utilize the residual heat resources of rotary kiln in all directions.Rotary kiln have a large amount of hyperthermia radiation heat to around distribute, though there have the kiln body to do to be limited heat insulation, not seeing has recycling.
Summary of the invention
Weak point at the prior art existence, the invention provides a kind of novel preroast rotary kiln flue gas waste heat recovery method, keep that pressure field, temperature field in the original heating cycle, rotary kiln is constant, on the impregnable basis of quality of the thermal process of guaranteeing pre-imitation frosted glass and pre-imitation frosted glass, reclaimed fume afterheat to greatest extent, simultaneously, recycle the residual heat resources of rotary kiln in all directions.
To achieve these goals, technical solution of the present invention is:
A kind of rotary kiln flue gas waste heat recovery method, on rotary kiln smoke evacuation pipeline at rotary kiln not the fume afterheat of equality of temperature section reclaim require to have the heat exchanger or the heat exchanger package of corresponding characteristics, at lowest temperature section heat exchanger exhanst gas outlet serial connection single-revolution kiln smoke evacuation steady flow system, also on the kiln body, be provided with radiation heating-surface, reclaim back special kiln hyperthermia radiation heat.
The usefulness of technique scheme is:
1., the quality that need not to change pre-burning production technology and technological parameter, product had assurance, the project implementation 0 risk compared with prior art, technical scheme of the present invention has following remarkable advantage:; Technical scheme rate of return on investment height, economic performance are good.Exhanst gas outlet side serial connection single-revolution kiln smoke evacuation steady flow system at flue gas lowest temperature section heat exchanger, the smoke evacuation steady flow system is controlled by the thermal parameter and the heating cycle of rotary kiln, the thermal parameter of rotary kiln and heating cycle set up the flue gas waste heat recovery heat exchanger package, the smoke evacuation steady flow system after with do not set up before the same, remain unchanged.Simultaneously, former pre-burning production technology and technological parameter need not to change, the original production main equipment also need not to change, significantly reduced technical solution of the present invention and implemented investment, improve the technical solution of the present invention rate of return on investment, the technical solution of the present invention economic performance is increased dramatically.2., guaranteeing to recycle the rotary kiln fume afterheat most possibly under the safe situation.Reach the characteristic that nearly 900 ℃, exhausted most rotary kiln flue gas all contain the composition that is corrosive, cold end corrosion easily takes place as sulphur, under a stable condition at rotary kiln exhaust gas temperature height, most of temperature, technical solution of the present invention on rotary kiln smoke evacuation pipeline, establish respectively heat exchanger to rotary kiln not the fume afterheat of equality of temperature section reclaim.The heat recovery heat exchanger that is located at high temperature has: high temperature resistant, resistance to high temperature corrosion, effectively solve hot Peng problem that expands, the heat recovery heat exchanger that is located at low temperature has: self adaptation is kept the cold end corrosion of corrosion component in high wall temperature, the anti-flue gas all the time, therefore, technical solution of the present invention can be recycled the rotary kiln fume afterheat to greatest extent, and security performance is unaffected.3., have stronger flexibility, meet the different needs, applicability is wide.The heat recovery heat exchanger that technical solution of the present invention adopted can be one or more, connecting mode can be series, parallel, string and mixing, and the user can be one or more, therefore, technical solution of the present invention has extremely strong flexibility, satisfies the different demands of different user.4., the rotary kiln residual heat resources have been utilized the most all sidedly.Technical solution of the present invention also comprises radiation heating-surface, described radiation heating-surface be arranged in the rotary kiln or housing on.Radiation heating-surface absorbs hyperthermia radiation heat in the rotary kiln, reduces the rotary kiln heat radiation and decreases the most comprehensive residual heat resources that reclaim rotary kiln fully.5., the design feature in conjunction with rotary kiln constitutes simple, efficient, economic radiation heating-surface.The set radiation heating-surface of technical solution of the present invention can be made of the pipe row of nearly subsides rotary kiln shell; Or when described rotary kiln shell had the hollow courage, set heating surface was made of this hollow courage; Or The combined constitutes.Owing to made full use of and brought into play the design feature and the advantage of described rotary kiln, when utilizing technical solution of the present invention, append to Min. new device structure, thereby can suppress the increase of cost, have simple, efficient, economic traits.
Description of drawings
Fig. 1 is an operation principle schematic diagram of the present invention
Fig. 2 is a prior art operation principle schematic diagram
Specific embodiments
The present invention now is described in conjunction with the accompanying drawings and embodiments.
A kind of rotary kiln flue gas waste heat recovery method as shown in Figure 1, this method be on the smoke evacuation pipeline 2 of rotary kiln 1, be provided with high temperature resistant, resistance to high temperature corrosion, the fume high-temperature zone waste heat that effectively solves 3 pairs of rotary kilns 1 of heat exchanger of the bloated problem of hot Peng reclaims, self adaptation is set all the time simultaneously keeps high wall temperature, the flue gas low-temperature zone waste heat of 4 pairs of rotary kilns 1 of heat exchanger of the cold end corrosion of corrosion component in the anti-flue gas reclaims, heat exchanger 4 is serially connected in the exhanst gas outlet side of heat exchanger 3, interconnect between heat exchanger 3 and the hot user 6, and the waste heat that will absorb flue gas flows to hot user 6 after changing, interconnect between heat exchanger 4 and the hot user 7, and the waste heat that will absorb flue gas flows to hot user 7 after changing, and satisfies different hot users' different heat demands.On the smoke evacuation pipeline 2 of rotary kiln 1, before the heat exchanger 3 smoke inlet sides, establish smoke regulating valve 9, smoke regulating valve 9 smoke inlet side smoke exhaust pipes 2 are provided with other flue 10, and on other flue 10, being provided with smoke regulating valve 8, smoke regulating valve 8 and 9 is out that one closes interlocked relationship.Thereby can guarantee on the safe basis, realize most possibly the fume afterheat of rotary kiln 1 being recycled.
Exhanst gas outlet side serial connection single-revolution kiln smoke evacuation steady flow system 5 at heat exchanger 4, described smoke evacuation steady flow system 5 is controlled by the thermal parameter and the heating cycle of rotary kiln 1, the thermal parameter of rotary kiln 1 and heating cycle are the same before setting up smoke gas afterheat heat exchanger 3, heat exchanger 4, smoke evacuation steady flow system 5 backs and not setting up, remain unchanged, simultaneously, original production main equipment rotary kiln 1 also need not to change, and has fundamentally guaranteed the quality, the project implementation 0 risk of product, high rate of return on investment.
Arrange radiation heating-surface 11 in rotary kiln 1 or on the housing, radiation heating-surface 11 absorbs hyperthermia radiation heat in the rotary kiln 1, reducing rotary kiln 1 heat radiation decreases, flow to the own independent corresponding user or the user 6,7 of heat exchanger 3,4 correspondences after the radiant heat that absorbs is changed, realize the most comprehensive residual heat resources of recycling rotary kiln 1 fully.
Radiation heating-surface 11, when rotary kiln 1 housing had the hollow courage, heating surface 11 was made of this hollow courage; Or when rotary kiln 1 did not have the hollow courage, row constituted by the pipe of nearly subsides rotary kiln 1 housing; Though or rotary kiln 1 housing has the hollow courage, constitute the raying hot side by this hollow courage and be not enough to the hyperthermia radiation of comprehensive recovery rotary kiln 1 when hot, then there is The combined to constitute.Structurally fully in conjunction with, utilized the design feature of rotary kiln 1 to suppress the increase of cost, make set radiation heating-surface 11 have simply, efficiently, economic traits.
Described a specific embodiment of the present invention above, but this explanation only is used for illustration, under the condition that does not break away from the scope of the invention, also can carries out various changes.
As shown in Figure 3, do not establish other flue.
As shown in Figure 4, establish other flue, and establish smoke regulating valve 12 after flue gas flow straightener 5, merge with flue collector at the other flue 10 of smoke regulating valve 12 exhanst gas outlet sides, the flue gas unification is discharged by a flue.
As shown in Figure 5, interconnect between heat exchanger 4 and the radiation heating-surface 11, and the waste heat that will absorb flue gas flows to the hyperthermia radiation heat that radiation heating-surface 11 continues to absorb rotary kilns 1 after changing, supply with hot user 7 after promoting temperature.
As shown in Figure 6, it is heat exchanger 13 that heat exchanger among Fig. 23, heat exchanger 4 are changed, the hyperthermia radiation heat that absorbs rotary kilns 1 with radiation heating-surface 11 after the fume afterheat that heat exchanger 13 absorbs rotary kiln 1 transforms transforms the back and joins, part flows to hot user 6, part flows to heat exchanger 14, supplies with hot user 7 and hot user 15 behind heat exchanger 14 again respectively.
The above only is the preferable specific embodiment of the present invention; but protection scope of the present invention is not limited thereto, and variation that any those skilled in the art of being familiar with can expect in the technical scope that the present invention discloses easily and replacement all should be encompassed in protection scope of the present invention.
Claims (6)
1. rotary kiln flue gas waste heat recovery method, it is characterized in that: on rotary kiln 1 smoke evacuation pipeline 2, establish heat exchanger 3,4 pairs of rotary kilns 1 of heat exchanger not the fume afterheat of equality of temperature section reclaim, supply with the hot user 6, the hot user 7 that link to each other with heat exchanger 3, heat exchanger 4 respectively.Exhanst gas outlet side serial connection single-revolution kiln 1 smoke evacuation steady flow system 5 at heat exchanger 4, smoke evacuation steady flow system 5 is controlled by the thermal parameter and the heating cycle of rotary kiln 1, the thermal parameter of rotary kiln 1 and heating cycle are the same before setting up heat exchanger 3, heat exchanger 4, smoke evacuation steady flow system 5 backs and not setting up, and remain unchanged.
2. a kind of rotary kiln flue gas waste heat recovery method according to claim 1 is characterized in that: described heat exchanger comprises one 1 or 3, two more than 1 and 3 or two, wherein, adopts serial or parallel connection or string and hybrid mode to connect more than two or two.
3. a kind of rotary kiln flue gas waste heat recovery method according to claim 2 is characterized in that: described two heat exchangers 1 and the heat exchanger more than 3 or two adopt identical or different heat exchanger.
4. according to a kind of rotary kiln flue gas waste heat recovery method described in arbitrary claim in the claim 1 to 3, it is characterized in that: described hot user comprises one 6 or 7, two more than 6 and 7 or two, wherein, two or more adopt serial or parallel connection or string and hybrid mode to connect.
5. according to a kind of rotary kiln flue gas waste heat recovery method described in arbitrary claim in the claim 1 to 4, it is characterized in that: also comprise radiation heating-surface 11, described radiation heating-surface 11 is arranged in the rotary kiln 1 or on the housing.Radiation heating-surface 11 absorbs hyperthermia radiation heat in the rotary kiln 1, reduces rotary kiln 1 heat radiation and decreases.Radiation heating-surface 11 connected mode independent or that constitute series, parallel or string and mix with claim 2 described heat exchangers.
6. according to a kind of rotary kiln flue gas waste heat recovery method described in the claim 5, it is characterized in that: described radiation heating-surface 11 is made of the pipe row who presses close to rotary kiln 1 housing; If described rotary kiln 1 housing has the hollow courage, heating surface 11 is made of this hollow courage; Or The combined constitutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103066226A CN102102944A (en) | 2009-09-07 | 2009-09-07 | Flue gas waste heat recovery method for rotary kiln |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009103066226A CN102102944A (en) | 2009-09-07 | 2009-09-07 | Flue gas waste heat recovery method for rotary kiln |
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| CN102102944A true CN102102944A (en) | 2011-06-22 |
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| CN2009103066226A Pending CN102102944A (en) | 2009-09-07 | 2009-09-07 | Flue gas waste heat recovery method for rotary kiln |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103047636A (en) * | 2013-01-08 | 2013-04-17 | 杨群峰 | Waste heat utilizing and energy saving device of low temperature smoke in sulfuric acid production |
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| CN2467169Y (en) * | 2001-03-02 | 2001-12-26 | 吕和武 | Flue gas dedusting & desulfurizing washing tower |
| CN2811901Y (en) * | 2005-08-11 | 2006-08-30 | 北京东方能汇能源工程技术有限公司 | Cement rotary kiln body with surface heat energy recovery device |
| CN201203355Y (en) * | 2008-01-25 | 2009-03-04 | 钱建荣 | Heat radiation reutilization apparatus of cement rotary kiln barrel |
| CN201229109Y (en) * | 2008-03-20 | 2009-04-29 | 江苏鹏飞集团股份有限公司 | Rotary kiln ring shaped residual heat collector |
| CN101435089A (en) * | 2008-12-03 | 2009-05-20 | 北京佰能电气技术有限公司 | System and method for utilizing residual heat of electrolyzer low temperature flue gas |
| WO2009110356A1 (en) * | 2008-03-07 | 2009-09-11 | 太平洋セメント株式会社 | System and method for treating bleed gas from cement kiln |
| CN201662317U (en) * | 2009-09-07 | 2010-12-01 | 厦门热工环保系统工程有限公司 | Flue gas waste heat recycling system of rotary kiln |
-
2009
- 2009-09-07 CN CN2009103066226A patent/CN102102944A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2467169Y (en) * | 2001-03-02 | 2001-12-26 | 吕和武 | Flue gas dedusting & desulfurizing washing tower |
| CN2811901Y (en) * | 2005-08-11 | 2006-08-30 | 北京东方能汇能源工程技术有限公司 | Cement rotary kiln body with surface heat energy recovery device |
| CN201203355Y (en) * | 2008-01-25 | 2009-03-04 | 钱建荣 | Heat radiation reutilization apparatus of cement rotary kiln barrel |
| WO2009110356A1 (en) * | 2008-03-07 | 2009-09-11 | 太平洋セメント株式会社 | System and method for treating bleed gas from cement kiln |
| CN201229109Y (en) * | 2008-03-20 | 2009-04-29 | 江苏鹏飞集团股份有限公司 | Rotary kiln ring shaped residual heat collector |
| CN101435089A (en) * | 2008-12-03 | 2009-05-20 | 北京佰能电气技术有限公司 | System and method for utilizing residual heat of electrolyzer low temperature flue gas |
| CN201662317U (en) * | 2009-09-07 | 2010-12-01 | 厦门热工环保系统工程有限公司 | Flue gas waste heat recycling system of rotary kiln |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103047636A (en) * | 2013-01-08 | 2013-04-17 | 杨群峰 | Waste heat utilizing and energy saving device of low temperature smoke in sulfuric acid production |
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Application publication date: 20110622 |