CN203364629U - System for recycling exhaust gas waste heat of rotary kiln of alumina plant - Google Patents
System for recycling exhaust gas waste heat of rotary kiln of alumina plant Download PDFInfo
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- CN203364629U CN203364629U CN2013202700273U CN201320270027U CN203364629U CN 203364629 U CN203364629 U CN 203364629U CN 2013202700273 U CN2013202700273 U CN 2013202700273U CN 201320270027 U CN201320270027 U CN 201320270027U CN 203364629 U CN203364629 U CN 203364629U
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- heat pipe
- heat
- economizer
- heating agent
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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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
- Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods
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Abstract
The utility model discloses a system for recycling exhaust gas waste heat of a rotary kiln of an alumina plant. The system comprises a clinker kiln, a heat pipe exchanger, a dust remover, a low-temperature economizer and a chimney which are sequentially connected, and exhaust gas passes through the clinker kiln, the heat pipe exchanger, the dust remover, the low-temperature economizer and the chimney; the clinker kiln is connected with the dust remover through the heat pipe exchanger; the heat pipe exchanger is further respectively connected with a heating medium supplying source and a steam heat energy consumption source, the heating medium supplying source comprises a water pump, and heat media sequentially passes through the heating medium supplying source, the low-temperature economizer, the heat pipe exchanger and the steam heat energy consumption source. According to the system, the heat pipe exchanger and the low-temperature economizer are additionally installed in front and back of the dust remover and respectively recover waste heat of intermediate-temperature exhaust gas and low-temperature exhaust gas to product low-pressure steam, low-temperature dew point corrosion of the heat pipe exchanger and high-temperature damage to the dust remover are avoided, production is stabilized, meanwhile comprehensive utilization efficiency of exhaust gas waste heat resources of the clinker kiln is greatly improved, the degree of self-sufficiency of the steam of the alumina plant is also promoted, and continuity and stability of production are guaranteed.
Description
Technical field
The utility model relates to the recovery and utilization technology field of waste heat in flue gas, particularly for recycling the system of alumina producer rotary kiln fume afterheat.
Background technology
At pre-desiliconizing with high alumina fly ash-soda lime sintering process, produce in the process of aluminium oxide, in workshop sections such as flyash pre-desiliconizing, calcium-silicon slag washing, carbon mother liquid evaporation and sodium hydroxide solution evaporations, aluminium oxide per ton needs the 0.6MP of 7 tons of left and right, the low-pressure saturated steam of 158 ℃.Alumina producer is self-built boiler for producing steam or outsourcing steam often, to meet need of production.The low-pressure steam cost accounts for 15% left and right of aluminium oxide totle drilling cost, has affected greatly the economic benefit of project.
Meanwhile, a large amount of middle temperature flue gas that soda lime sintering process factory also has, the rotary kiln of φ 4.5 * 90m of take is example, exhaust gas volumn is 4,700,000,000 m3/ platform .h, the kiln exit gas temperature is up to 250 ℃ of left and right, the about heat of 186GJ/ platform .h, the heat of the nearly 9300GJ/h of the whole nation more than 50 bar rotary kiln, emitted endlessly, caused the huge waste of the energy.
The research of centering low-temperature flue gas comprehensive utilization both at home and abroad at present has a lot, such as the flue gas in thermal power plant, cement plant, in order to heating, refrigeration, generating and oven dry, uses, and the waste heat utilization equipment of employing is mainly economizer, heating-medium heat exchanger, heat exchange of heat pipe etc.The heating-medium heat exchanger running device is many, and to the system requirements harshness, maintenance and running expense are high; Economizer is owing to being outside heat transfer in pipe, gas-gas or the solution-air heat transfer thermal efficiency is all very low, dust stratification and obstruction easily occur causes heat-transfer effect obviously to descend, and, due to the tube wall temperature fluid temperature (F.T.) larger close to heat transfer coefficient, cause managing ancient piece of jade, round, flat and with a hole in its centre temperature and be easy to be corroded lower than the flue gas dew point temperature; Heat exchange of heat pipe is converted into two external heat transfer processes by the heat transfer between the outside in pipe, and the thermal efficiency is high, and leaks outside and clogging in being difficult for occurring, and simultaneously due to good isothermal, pipe ancient piece of jade, round, flat and with a hole in its centre temperature, close to vapor (steam) temperature in pipe, is not easy to occur dew point corrosion; But before economizer, heat exchange of heat pipe great majority are arranged on deduster, the low-temperature zone waste gas after deduster nearly all enters in atmosphere, and heat loss is larger.
And the domestic and international research for soda lime sintering process factory rotary kiln fume afterheat also seldom, does not more have commercial Application.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of for recycling the system of alumina producer rotary kiln fume afterheat, solves the existing low problem of alumina producer rotary kiln fume afterheat utilization rate.
For solving the problems of the technologies described above, it is a kind of for recycling the system of alumina producer rotary kiln fume afterheat that the utility model provides, and comprises:
Chamotte kiln, deduster and the chimney of described flue gas through being linked in sequence, and heat exchange of heat pipe;
Described chamotte kiln is connected with deduster by described heat exchange of heat pipe;
Described heat exchange of heat pipe also provides source, steam thermal energy consumption source to be connected with heating agent respectively, and wherein, described heating agent provides source to comprise water pump, and described heating agent sequentially provides source, heat exchange of heat pipe, steam thermal energy to consume source through heating agent.
Further, native system also comprises low-level (stack-gas) economizer, and described heat exchange of heat pipe is connected with described low-level (stack-gas) economizer by deduster; Described heat exchange of heat pipe provides source to be connected by described low-level (stack-gas) economizer and heating agent, and described heating agent sequentially provides source, described low-level (stack-gas) economizer, described heat exchange of heat pipe through heating agent.
Further, native system also comprises oxygen-eliminating device, and described oxygen-eliminating device provides source, steam thermal energy consumption source to be connected with described heating agent respectively.
Further, native system also comprises softened water tank, and described steam thermal energy consumption source is connected with described oxygen-eliminating device by described softened water tank.
Further, described flue gas sequentially passes through chamotte kiln, heat exchange of heat pipe, deduster, low-level (stack-gas) economizer and chimney; Described heating agent sequentially provides source, low-level (stack-gas) economizer, heat exchange of heat pipe, steam thermal energy to consume source, softened water tank through oxygen-eliminating device, heating agent.
The utility model main feature is, the characteristics that are rich in steam and contain sulfur dioxide, nitrogen oxide according to the chamotte kiln flue gas, installed heat exchange of heat pipe additional and produced low-pressure steam before deduster, flue-gas temperature drops to 150 ℃ from 250 ℃, not only greatly improved the utilization ratio of high temperature section waste heat, reduce the infringement of high-temperature flue gas to electric precipitation, and reduced the possibility that dew point corrosion occurs, reduced the expense of anticorrosion investment and maintenance; Installed the low-level (stack-gas) economizer that adopts anti-corrosion material additional after deduster, effectively utilized chamotte kiln waste gas low-temperature zone heat energy, and the flue gas after dedusting effectively reduces again the maintenance cost of anti-corrosion material to low-level (stack-gas) economizer tube wall wearing and tearing attenuating greatly.
The utility model provide for recycling the system of alumina producer rotary kiln fume afterheat, by different heat exchangers is installed before and after deduster, using the chamotte kiln smoke evacuation system of alumina by sintering factory with as the industrial steam user that steam thermal energy consumes source, be communicated with for unified total system, utilized to greatest extent the chamotte kiln smoke heat energy, avoid heat exchange of heat pipe low-temperature dew point corrosion, deduster high-temperature damage simultaneously, equipment investment and maintenance cost have been reduced, promote the degree of self-sufficiency of alumina producer steam, guaranteed the continous-stable of producing.
The accompanying drawing explanation
Fig. 1 is the structural representation for the system of recycling alumina producer rotary kiln fume afterheat that the utility model embodiment provides;
Reference numeral:
The 1-chamotte kiln; The 2-heat exchange of heat pipe; The 3-low-level (stack-gas) economizer; The 4-deduster; The 5-water pump; The 6-oxygen-eliminating device; The 7-softened water tank; The 8-industrial user; The 9-chimney.
The specific embodiment
Referring to Fig. 1, the utility model embodiment provide for recycling the system of alumina producer rotary kiln fume afterheat, flue gas, successively through the chamotte kiln 1, heat exchange of heat pipe 2, deduster 4, the low-level (stack-gas) economizer 3 that are linked in sequence, is finally discharged from chimney 9.Simultaneously, the heating agent reverse with flow of flue gas, provided by water pump 5, this heating agent successively through the water pump 5 that is linked in sequence, low-level (stack-gas) economizer 3, heat exchange of heat pipe 2, consume industrial user 8, softened water tank 7 and the oxygen-eliminating device 6 in source as steam thermal energy.The utility model is arranged on deduster 4 both sides by heat exchange of heat pipe 2 and low-level (stack-gas) economizer 3, heat exchange of heat pipe 2 is connected with rotary kiln 1 smoke evacuation system, deduster 4 is connected with chimney 9, heat exchange of heat pipe 2 other ends are connected with industrial user 8, and the other end of low-level (stack-gas) economizer 3 is connected with softened water tank 7 with oxygen-eliminating device 6 by water pump 5.
Below the operation principle for the system of recycling alumina producer rotary kiln fume afterheat that the utility model embodiment provides:
Before flue gas enters deduster 4, warm fume afterheat in first reclaiming with heat exchange of heat pipe 2, the hot water that will flow through 75 ℃ of left and right coming from low-level (stack-gas) economizer 3 becomes 0.6MP, the low-pressure saturated steam of 158 ℃, supplies with alumina producer industrial user 8 and uses.Meanwhile, the flue-gas temperature after heat exchange of heat pipe 2 is reduced to 150 ℃ of left and right from 250 ℃ of left and right, forms low-temperature flue gas, after deduster 4 as the thermal source of low-level (stack-gas) economizer 3.Low-pressure saturated steam, after industrial user 8 uses, produces the condensed water of 25 ℃, is delivered to the waste heat of the interior recovery low-temperature flue gas of low-level (stack-gas) economizer 3 after oxygen-eliminating device 6 deoxygenations by water pump 5.The hot water of low-level (stack-gas) economizer 3 interior generations is sent to the waste heat of warm flue gas in heat exchange of heat pipe 2 recovery, and now the low-temperature flue gas temperature is down to 100 ℃ of left and right, then sends into chimney 9 and enters atmosphere.The utility model embodiment provide for recycling the system of alumina producer rotary kiln fume afterheat, the thermal source of recycling is alumina producer used heat resource fully, improved the utilization rate of middle low-temperature flue gas waste heat, 3 rotary kilns producing 240000 tons of aluminium oxide per year of take are example, the fume afterheat that rotary kiln produces can produce the 0.6MP saturated vapor of 37t/h, can only save 2.6 ten thousand tons of standard coals every year, saves more than 1,800 ten thousand yuan of steam costs.
It should be noted last that, the above specific embodiment is only unrestricted in order to the technical solution of the utility model to be described, although with reference to example, the utility model is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement the technical solution of the utility model, and not breaking away from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (5)
1. for recycling the system of alumina producer rotary kiln fume afterheat, chamotte kiln (1), deduster (4) and the chimney (9) of described flue gas through being linked in sequence, is characterized in that, also comprises:
Heat exchange of heat pipe (2);
Described chamotte kiln (1) is connected with deduster (4) by described heat exchange of heat pipe (2);
Described heat exchange of heat pipe (2) also provides source, steam thermal energy consumption source to be connected with heating agent respectively, wherein, described heating agent provides source to comprise water pump (5), and described heating agent comprises water, and described heating agent sequentially provides source, heat exchange of heat pipe (2), steam thermal energy to consume source through heating agent.
2. the system as claimed in claim 1, is characterized in that, also comprises low-level (stack-gas) economizer (3), and described heat exchange of heat pipe (2) is connected with described low-level (stack-gas) economizer (3) by described deduster (4); Described heat exchange of heat pipe (2) provides source to be connected by described low-level (stack-gas) economizer (3) with heating agent, and described heating agent sequentially provides source, described low-level (stack-gas) economizer (3), described heat exchange of heat pipe (2) through heating agent.
3. system as claimed in claim 1 or 2, is characterized in that, also comprises oxygen-eliminating device (6), and described oxygen-eliminating device (6) provides source, steam thermal energy consumption source to be connected with described heating agent respectively.
4. system as claimed in claim 3, is characterized in that, also comprises softened water tank (7), and described steam thermal energy consumption source is connected with described oxygen-eliminating device (6) by described softened water tank (7).
5. system as claimed in claim 4, is characterized in that,
Described flue gas sequentially passes through chamotte kiln (1), heat exchange of heat pipe (2), deduster (4), low-level (stack-gas) economizer (3) and chimney (9);
Described heating agent sequentially passes through oxygen-eliminating device (6), heating agent provides source, low-level (stack-gas) economizer (3), heat exchange of heat pipe (2), steam thermal energy to consume source, softened water tank (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202700273U CN203364629U (en) | 2013-05-17 | 2013-05-17 | System for recycling exhaust gas waste heat of rotary kiln of alumina plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202700273U CN203364629U (en) | 2013-05-17 | 2013-05-17 | System for recycling exhaust gas waste heat of rotary kiln of alumina plant |
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| Publication Number | Publication Date |
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| CN203364629U true CN203364629U (en) | 2013-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013202700273U Expired - Lifetime CN203364629U (en) | 2013-05-17 | 2013-05-17 | System for recycling exhaust gas waste heat of rotary kiln of alumina plant |
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| CN (1) | CN203364629U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105889963A (en) * | 2015-07-07 | 2016-08-24 | 大唐环境产业集团股份有限公司 | Heat exchange device for wet desulphurization system |
| CN109988874A (en) * | 2017-12-29 | 2019-07-09 | 西安华江环保科技股份有限公司 | A kind of blast furnace pure water closed circulating water system waste heat recycling system and method |
-
2013
- 2013-05-17 CN CN2013202700273U patent/CN203364629U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105889963A (en) * | 2015-07-07 | 2016-08-24 | 大唐环境产业集团股份有限公司 | Heat exchange device for wet desulphurization system |
| CN105889963B (en) * | 2015-07-07 | 2018-09-07 | 大唐环境产业集团股份有限公司 | A kind of heat-exchanger rig for wet desulfurization system |
| CN109988874A (en) * | 2017-12-29 | 2019-07-09 | 西安华江环保科技股份有限公司 | A kind of blast furnace pure water closed circulating water system waste heat recycling system and method |
| CN109988874B (en) * | 2017-12-29 | 2024-03-15 | 西安华江环保科技股份有限公司 | System and method for recycling waste heat of pure water closed-loop circulating water of blast furnace |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131225 |
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| CX01 | Expiry of patent term |