CN102865746A - Improved waste heat power generation system for cement industry - Google Patents
Improved waste heat power generation system for cement industry Download PDFInfo
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- CN102865746A CN102865746A CN2011101851144A CN201110185114A CN102865746A CN 102865746 A CN102865746 A CN 102865746A CN 2011101851144 A CN2011101851144 A CN 2011101851144A CN 201110185114 A CN201110185114 A CN 201110185114A CN 102865746 A CN102865746 A CN 102865746A
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- boiler
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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
Abstract
The invention discloses an improved waste heat power generation system for the cement industry. The improved waste heat power generation system comprises a clinker cooler, a kiln front boiler, a kiln tail boiler and a steam turbine, wherein the kiln front boiler and the kiln tail boiler respectively comprise an evaporator, a superheater and a steam pocket. Flue gas generated by the clinker cooler is respectively conveyed to the kiln front boiler and the kiln tail boiler, the kiln front boiler and the kiln tail boiler are respectively provided with a vertical structure, and the kiln front boiler and the kiln tail boiler share an economizer and a high-temperature superheater. Preheated water is respectively conveyed to the kiln front boiler and the kiln tail boiler by the economizer, the steam temperature of the kiln front boiler and the kiln tail boiler is adjusted by the high-temperature superheater, steam conveyed into the steam turbine is low in temperature difference or the same in temperature, the waste heat power generation system is small in occupied area, convenient to arrange, high in boiler heat efficiency and economical, and the kiln front boiler is low in abrasion.
Description
Technical field
The present invention and a kind of electricity generation system relate in particular to a kind of modified cement industry afterheat generating system.
Background technology
In the manufacture of cement industry, utilize the cogeneration of producing the cement generation very general.A kind of cement kiln waste-heat power generation system such as No. 200720038566.9 bulletin of Chinese patent, in this cement afterheat generation system, the air inlet of kiln head boiler 13 is the top-down gas modes that enter, this kind intake method is unfavorable for the reduction of solid particle in the flue gas, thereby is difficult to alleviate in the flue gas solid particle to the wearing and tearing of kiln head boiler.A suction opeing 5 is only offered at the middle part of chamotte cooler 1, and the resistance that flue gas is got rid of is large, is unfavorable for eliminating and the utilization of high hot flue gas, causes system's heat exchange efficiency and stability not high.In addition, this cement kiln waste-heat power generation system economy is not high.
Summary of the invention
In view of the above, the invention provides a kind of modified cement industry afterheat generating system that alleviates the wearing and tearing of kiln head boiler and can improve fume afterheat utilization rate and systematic economy.
A kind of modified cement industry afterheat generating system, comprise chamotte cooler, kiln tail boiler, kiln head boiler, and steam turbine, kiln tail boiler comprises the first evaporimeter, the first superheater, and first drum, kiln head boiler comprises economizer, the second evaporimeter, the second superheater, and second drum, chamotte cooler has front suction opeing and tail suction opeing, front suction opeing connects kiln tail boiler, the tail suction opeing is with direct discharge tail flue gas, the chamotte cooler middle part offers warm suction opeing among a high temperature suction opeing and, ripe kiln head boiler and kiln tail boiler share an economizer and a high temperature superheater, carry preheating water to kiln head boiler and kiln tail boiler respectively by economizer, the flue gas that described chamotte cooler produces respectively from the high temperature suction opeing and warm suction opeing enter respectively kiln head boiler from the bottom of kiln head boiler after shedding, the flue gas of high temperature suction opeing mixes with the flue gas of middle temperature suction opeing after high temperature superheater is processed, the flue gas of this mixing is through the second evaporimeter, the second superheater, and second form steam after the drum effect and enter a Rendezvous Point, the flue gas that chamotte cooler produces is delivered to kiln tail boiler by front suction opeing simultaneously, flue gas in kiln tail boiler is through the first evaporimeter, the first superheater, and first form steam after the drum effect and enter described Rendezvous Point, the steam of described Rendezvous Point enters steam turbine through after the described high temperature superheater effect, for the steam turbine work done
This modified cement industry with afterheat generating system by offer warm suction opeing among a high temperature suction opeing and at chamotte cooler middle part, regulate flue gas flow by the air door of regulating each suction opeing, improve the utilization rate of hot flue gas, increase system's heat exchange efficiency and stability.By flue gas is sent in the bottom from kiln head boiler, can cancel that before entering kiln head boiler expansion chamber being set, utilize the bottom air inlet of kiln head boiler, flue gas mode from bottom to top, solid content in the flue gas can be reduced about 70%, can alleviate the wearing and tearing to kiln head boiler.Kiln head boiler and kiln tail boiler share an economizer and a superheater, improve the economy of system.
Description of drawings
Fig. 1 is the modified cement industry afterheat generating system flow chart of preferred embodiment of the present invention.
The specific embodiment
By describing technology contents of the present invention, structural feature in detail, being realized purpose and effect, below in conjunction with embodiment and cooperate accompanying drawing to give in detail explanation.
Consult Fig. 1, preferred embodiment of the present invention discloses a kind of high modified cement industry afterheat generating system, comprises chamotte cooler 1, kiln tail boiler 3, kiln head boiler 5, water supply system 6, and steam turbine 7.This chamotte cooler 1 is to kiln tail boiler 3, kiln head boiler 5 supplied flue gases, and kiln tail boiler 3, kiln head boiler 5 cooperate water supply system 6, produces steam for steam turbine 7 actings.
1 pair of clinker of described chamotte cooler cools off, produces a large amount of hot flue gases of being with.This chamotte cooler 1 has feed end 11 and discharge end 12, is provided with front suction opeing 13 near feed end 11, is provided with tail suction opeing 14 near discharge end 12.The middle part of chamotte cooler 1 offers high temperature suction opeing 15 and middle temperature suction opeing 16, is provided with baffle plate (indicating) between each suction opeing, and baffle plate is used for preventing the mutual vibration mixing of flue gas of different temperatures scope.
Described front suction opeing 13 connects single-revolution kiln 4.Rotary kiln 4 is used for raw material that grinding is prepared, burns till to be grog under the high temperature action of rotary kiln 4.The grog that rotary kiln 4 is fired is sent to chamotte cooler 1 interior cooling by front suction opeing 13, and the hot flue gas of being with that chamotte cooler 1 cooling grog produces at feed end 12 places enters again in the rotary kiln 4 through front suction opeing 13, for rotary kiln 4 provides hot-air.
One end of the relatively front suction opeing 13 of rotary kiln 4 connects kiln tail preheater 8.Kiln tail preheater 8 is used for raw material are heated, and before raw material entered rotary kiln 4 heating, raw material mixed with the flue gas that rotary kiln 4 is discharged, and raw material are suspended in and carry out heat exchange in the hot flue gas, have greatly improved heat transfer area and the heat transfer efficiency of raw material.Heat transfer rate in kiln tail preheater 8 is fast, approximately can make raw material be warming up to rapidly 750 ~ 800 degrees centigrade from room temperature in 20 seconds, and in general rotary kiln, then needs approximately 1 hour.Under suspended state, the raw material particle diameter is less, and required time is shorter.Kiln tail preheater 8 comprises a plurality of flared blanking devices 81, and is step at vertical direction and arranges, so, raw material from top to bottom, high-temperature gas from bottom to top, thereby can fully heat raw material.
Rotary kiln 4 required raw material are carried by a feed system 40, and feed system 40 comprises pulverizer 41, material grinder 42, material screening machine 43, reaches elevator 44.Material grinder 42 pulverized raw material and deliver to by pulverizer 41, and material grinder 42 further grinds raw material, and the raw material screening after material screening machine 43 will grind is also delivered to elevator 44 with raw material, and elevator 44 is delivered to raw material at the top of kiln tail preheater 8.In abrasive process, the flue gas that abrasive material produces is discharged by the first smokestack 47 through material screening machine 43, one first deduster 45, one first blower fan 46.
The flue gas that discharge at rotary kiln 4 tops enters from described kiln tail boiler 3 tops, discharges from kiln tail boiler 3 bottoms.This kiln tail boiler 3 is used for the hot flue gas of being with that rotary kiln 4 produces is used to produce steam.Kiln tail boiler 3 is vertical structure, and Natural Circulation singly is installed with meter.Kiln tail boiler 3 comprises the first evaporimeter 32, the first superheater 33 and the first drum 34 etc.Described the first evaporimeter 32 be used for by with the heat exchange of flue gas, produce saturated vapor.Described the first superheater 33 is for being used for saturated vapor is become the firing equipment of superheated steam, by the again heating to steam, improves its degree of superheat (temperature poor), improves the acting ability of its unit working medium.The first drum 34 is connection hinges of working medium heating, evaporation, overheated three processes, and inside is provided with water separator and continuous blow off equipment, guarantees the Boiler Steam quality, guarantees the normal water circulation of boiler.Flue gas is through the first evaporimeter 32 in the kiln tail boiler 3, the first superheater 33,34 effects of the first drum, and in conjunction with water supply system 6 feedwater, enter the flue gas of kiln tail boiler 3 and heat transfer water and produce steam, this steam out enters into a Rendezvous Point 35 afterwards from the first superheater 33.Flue gas after the heat transfer is discharged from kiln tail boiler 3 bottoms, enters material grinder 42 and a conditioning Tower 37 by one second blower fan 36, and the flue gas that enters material grinder 42 further utilizes for the waste heat of flue gas; The flue gas that enters conditioning Tower 37 with by conditioning Tower 37 coolings, depositing dust to adapt to the dedusting requirement of the first deduster 45.The flue gas that enters material grinder 42 and a conditioning Tower 37 compiles through the first deduster 45, the first blower fan 46, is discharged by the first smokestack 47.
The flue-gas temperature that described high temperature suction opeing 15 is extracted out is generally at 400 ℃-500 ℃, and high temperature suction opeing 15 is connected with the first air inlet 501 of kiln head boiler 5 bottoms.The flue-gas temperature that middle temperature suction opeing 16 is extracted out is generally at 350 ℃-390 ℃, and middle temperature suction opeing 16 is by being connected with the second air inlet 502 of kiln head boiler 5 bottoms.The flue gas that enters from the first air inlet 501 down enters expansion chamber 504 in the kiln head boiler 5 through a high temperature superheater 503, and the flue gas that enters from the second air inlet 502 down directly enters expansion chamber 504 to be mixed with the flue gas that the first air inlet 501 advances-enters.By the size of high temperature superheater 503 heating surfaces suitably is set, so that the temperature from the first air inlet 501 flue-gas temperature that enters and the flue gas that enters from the second air inlet 502 after 503 heat absorptions of process high temperature superheater is similar to or equates.This kiln head boiler 5 is vertical structure, comprises economizer 51, the second evaporimeter 52, the second superheater 53, the second drum 54 etc.Described economizer 51 is one group of heating surface, be used for preheating is carried out in boiler feedwater, improve feed temperature, after avoiding feedwater to enter the first drum 34, cold and hot excessive temperature differentials, produce excessive thermal stress the first drum 34 is formed safely threat, also avoid 34 water-level fluctuations of the first drum excessive simultaneously, cause automatic control difficulty.Maximally utilise on the one hand waste heat, reduce exhaust gas temperature, on the other hand, form high-temperature high pressure water behind the feed-water preheating, produce the thermal source of saturated vapor as the first evaporimeter 32.The second superheater 53 and the outlet of the first superheater 33 of kiln tail boiler 3 of kiln head boiler 5 are tied in described Rendezvous Point 35 by pipeline, the outlet of Rendezvous Point 35 is joined by the import of pipeline and high temperature superheater 503, and the outlet of high temperature superheater 503 is joined by pipeline and described steam turbine 7.Through the flue gas behind the expansion chamber 504, in kiln head boiler 5, discharge from the top of kiln head boiler 5 through the second superheater 53, the second evaporimeter 52, economizer 51 successively from the bottom up, then through one second deduster 71, one the 3rd blower fan 72, discharged by one second smokestack 73.
Kiln head boiler 5 is provided by water supply system 6 with the feedwater of kiln tail boiler 3.The rear minute two-way of economizer 51 heating of kiln head boiler 5 got to water by one feed pump 63 of water supply system 6, one the tunnel enters the second drum 54 of kiln head boiler 5, another road enters the first drum 34 of kiln tail boiler 3, water in the second drum 54 and the first drum 34 is by natural circulation mode second evaporimeter 52 of respectively hanging oneself, 32 air-breathing boilings arrive the second drum 54 separately afterwards, 34 saturated vapors of separating from the second drum 54 and the first drum 34 are through separately the second superheater 53, after 33, become superheated steam, by establishing the second superheater 53,33 heating surface size, can be approaching or identical with the first superheater 33 vapor (steam) temperature out from kiln tail boiler 3 from the second superheater 53 steam out of kiln head boiler 5, two strands of identical superheated steams of temperature after Rendezvous Point 35 compiles, enter high temperature superheater 503 carry out overheated, deliver to steam turbine 7 expansion workings after overheated, the water droplet that forms after steam turbine 7 works done enters water supply system 6.
Water supply system 6 comprises condenser 61, hot well 62, condensate pump (not shown), vacuum dust cather (not shown), described feed pump 63, circulating pump 64 and cooling tower 65 etc.; Behind steam turbine 7 expansion workings, exhaust steam drains into condenser 61, exhaust steam condenses into water in condensing 61 after, imports hot well 62, then is sent to vacuum dust cather by condensate pump, again through feed pump 63 pump into kiln head boiler 5, kiln tail boiler 3 recycles.When condenser 61 work, circulating pump 64 is discharged into cooling tower 65 again and cools off after the cooling water in the pond 66 is squeezed into condenser 61, gets back at last in the pond 66 recycling through overcooled water.
This modified cement industry with afterheat generating system by offer warm suction opeing 16 among a high temperature suction opeing 15 and at chamotte cooler 1 middle part, regulate flue gas flow by the air door of regulating each suction opeing, improve the utilization rate of hot flue gas, increase system's heat exchange efficiency and stability.By flue gas is being sent into from the bottom of kiln head boiler 5, can cancel that before entering kiln head boiler 5 expansion chamber being set, utilize the bottom air inlet of kiln head boiler 5, flue gas mode from bottom to top, solid content in the flue gas can be reduced about 70%, can alleviate the wearing and tearing to kiln head boiler 5.Kiln head boiler 5 shares an economizer and a high temperature superheater 503 with kiln tail boiler 3, improves the economy of system.In addition, since from the second superheater 53 of kiln head boiler 5 out steam and be to mix first more further heating from the first superheater 33 steam out of kiln tail boiler 3, vapor (steam) temperature is approaching or identical during mixing, therefore reduce or avoided entropy to increase phenomenon, temperature and the flow of steam turbine 7 import superheated steams also are improved, thereby have increased generating capacity.
The above only is embodiments of the invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. modified cement industry afterheat generating system, comprise chamotte cooler, kiln tail boiler, kiln head boiler, and steam turbine, kiln tail boiler comprises the first evaporimeter, the first superheater, and first drum, kiln head boiler comprises economizer, the second evaporimeter, the second superheater, and second drum, chamotte cooler has front suction opeing and tail suction opeing, front suction opeing connects kiln tail boiler, the tail suction opeing is with direct discharge tail flue gas, it is characterized in that: the chamotte cooler middle part offers warm suction opeing among a high temperature suction opeing and, ripe kiln head boiler and kiln tail boiler share an economizer and a high temperature superheater, carry preheating water to kiln head boiler and kiln tail boiler respectively by economizer, the flue gas that described chamotte cooler produces respectively from the high temperature suction opeing and warm suction opeing enter respectively kiln head boiler from the bottom of kiln head boiler after shedding, the flue gas of high temperature suction opeing mixes with the flue gas of middle temperature suction opeing after high temperature superheater is processed, the flue gas of this mixing is through the second evaporimeter, the second superheater, and second form steam after the drum effect and enter a Rendezvous Point, the flue gas that chamotte cooler produces is delivered to kiln tail boiler by front suction opeing simultaneously, flue gas in kiln tail boiler is through the first evaporimeter, the first superheater, and first form steam after the drum effect and enter described Rendezvous Point, the steam of described Rendezvous Point enters steam turbine through after the described high temperature superheater effect, for the steam turbine work done.
2. modified cement industry afterheat generating system according to claim 1, it is characterized in that: described high temperature superheater is arranged in the described kiln head boiler, the first air inlet of described high temperature suction opeing and kiln head boiler bottom is connected, and the flue gas that enters from the first air inlet passes through described high temperature superheater and down enters expansion chamber in the kiln head boiler.
3. modified cement industry afterheat generating system according to claim 2, it is characterized in that: the second air inlet of described middle temperature suction opeing and kiln head boiler bottom is connected, and the flue gas that enters from the second air inlet directly enters expansion chamber to be mixed with the flue gas that the first air inlet enters.
4. modified cement industry afterheat generating system according to claim 3 is characterized in that: be similar to or equate through the temperature from the first air inlet flue-gas temperature that enters and the flue gas that enters from the second air inlet after the described high temperature superheater heat absorption.
5. modified cement industry afterheat generating system according to claim 3 is characterized in that: described front suction opeing connection single-revolution kiln, the end connection kiln tail preheater of the relatively front suction opeing of rotary kiln.
6. modified cement industry afterheat generating system according to claim 5 is characterized in that: the flue gas that discharge at described rotary kiln top enters from described kiln tail boiler top, discharges from kiln tail boiler bottom.
7. modified cement industry afterheat generating system according to claim 6, it is characterized in that: the flue gas behind the described expansion chamber, in kiln head boiler, discharge from the top of kiln head boiler through the second superheater, the second evaporimeter, economizer successively from the bottom up, then through a deduster, a blower fan, discharged by a smokestack.
8. modified cement industry afterheat generating system according to claim 1, it is characterized in that: the required raw material of described rotary kiln are carried by a feed system, feed system comprises pulverizer, material grinder, material screening machine, reaches elevator, material grinder is pulverized and delivered to pulverizer with raw material, material grinder further grinds raw material, raw material screening after material screening machine will grind is also delivered to elevator with raw material, and elevator is delivered to raw material at the top of kiln tail preheater.
9. modified cement industry afterheat generating system according to claim 1, it is characterized in that: the feedwater of described kiln head boiler and kiln tail boiler is provided by a water supply system, and water supply system comprises condenser, hot well, condensate pump, vacuum dust cather, feed pump, circulating pump and cooling tower.
10. modified cement industry afterheat generating system according to claim 1, it is characterized in that: described kiln head boiler and kiln tail boiler are vertical structure.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103673650A (en) * | 2013-12-13 | 2014-03-26 | 南京凯盛开能环保能源有限公司 | Steel mill surplus gas and sanitary steam comprehensive utilization system and method |
| CN103743250A (en) * | 2013-12-30 | 2014-04-23 | 陕西大唐新能电力设计有限公司 | Cement plant heat-work co-production method |
| CN105890391A (en) * | 2016-05-23 | 2016-08-24 | 湖南思为能源环保工程有限公司 | Waste heat recovery device of cement kiln |
| CN106640221A (en) * | 2016-10-10 | 2017-05-10 | 南京凯盛开能环保能源有限公司 | Efficient cement kiln waste heat recovery and power generation system and method |
| CN107036069A (en) * | 2017-05-18 | 2017-08-11 | 杭州江东富丽达热电有限公司 | Boiler steam and water circuit |
| WO2018209884A1 (en) * | 2017-05-18 | 2018-11-22 | 南京凯盛开能环保能源有限公司 | Kiln head boiler |
| CN110314543A (en) * | 2019-08-02 | 2019-10-11 | 陕西大秦环境科技有限公司 | Dirt arrangement SCR denitration device and technique in a kind of cement kiln |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103673650A (en) * | 2013-12-13 | 2014-03-26 | 南京凯盛开能环保能源有限公司 | Steel mill surplus gas and sanitary steam comprehensive utilization system and method |
| CN103743250A (en) * | 2013-12-30 | 2014-04-23 | 陕西大唐新能电力设计有限公司 | Cement plant heat-work co-production method |
| CN105890391A (en) * | 2016-05-23 | 2016-08-24 | 湖南思为能源环保工程有限公司 | Waste heat recovery device of cement kiln |
| CN106640221A (en) * | 2016-10-10 | 2017-05-10 | 南京凯盛开能环保能源有限公司 | Efficient cement kiln waste heat recovery and power generation system and method |
| CN106640221B (en) * | 2016-10-10 | 2018-03-13 | 南京凯盛开能环保能源有限公司 | A kind of cement kiln efficient waste heat recovery electricity generation system and method |
| CN107036069A (en) * | 2017-05-18 | 2017-08-11 | 杭州江东富丽达热电有限公司 | Boiler steam and water circuit |
| WO2018209884A1 (en) * | 2017-05-18 | 2018-11-22 | 南京凯盛开能环保能源有限公司 | Kiln head boiler |
| CN110314543A (en) * | 2019-08-02 | 2019-10-11 | 陕西大秦环境科技有限公司 | Dirt arrangement SCR denitration device and technique in a kind of cement kiln |
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Application publication date: 20130109 |