CN110793337A - Rotary kiln barrel waste heat recovery system - Google Patents
Rotary kiln barrel waste heat recovery system Download PDFInfo
- Publication number
- CN110793337A CN110793337A CN201810870188.3A CN201810870188A CN110793337A CN 110793337 A CN110793337 A CN 110793337A CN 201810870188 A CN201810870188 A CN 201810870188A CN 110793337 A CN110793337 A CN 110793337A
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- China
- Prior art keywords
- waste heat
- rotary kiln
- air
- recovery system
- heat recovery
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/006—Systems for reclaiming waste heat using a boiler
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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
Abstract
The invention provides a rotary kiln cylinder waste heat recovery system, which comprises: rotating the kiln cylinder; the sleeve is sleeved on the rotary kiln cylinder and provided with an air inlet and an air outlet, and a gap is formed between the inner surface of the sleeve and the outer surface of the rotary kiln cylinder; the air supply outlet faces the air supply device of the air inlet; the air suction device is arranged at the air outlet and the air suction inlet faces the air outlet; and the waste heat boiler is communicated with the air suction device. Therefore, the heat on the surface of the rotary kiln cylinder can be concentrated in the sleeve to avoid loss, and the hot air at about 200 degrees can be generated after the air sent by the air supply device flows through the surface of the rotary kiln cylinder, and finally can be sucked back to the waste heat boiler by the air suction device to be utilized, so that the rotary kiln cylinder waste heat recovery system has higher waste heat utilization rate.
Description
Technical Field
The invention relates to the technical field of energy conservation and environmental protection, in particular to a rotary kiln barrel waste heat recovery system.
Background
Because the cement production process needs to consume a large amount of energy in the production process of clinker formation and grinding, and a large amount of energy is wasted in a cement production system, a cement plant becomes a well-known large consumer consuming energy, and simultaneously, a large amount of waste gas containing heat energy is generated. At present, with the development of science and technology and the progress of technology, the modern large-scale cement production process generally adopts a novel dry-process production process of decomposing outside a kiln, so that the energy utilization rate is greatly improved, and meanwhile, the waste gas and waste heat resources discharged from the head and the tail of the kiln are utilized to generate low-temperature steam for power generation, so that the energy utilization rate is further improved.
The existing waste heat recovery device is generally characterized in that heat exchange equipment is arranged on the surface of a rotary kiln cylinder, and heat exchange is carried out between a heat exchange pipe with a cold source and the rotary kiln cylinder through injection so as to recover waste heat dissipated from the surface of the rotary kiln cylinder. However, since the waste heat recovery device mainly depends on heat radiation for waste heat recovery, the waste heat utilization rate is still not very high, for example, after the existing waste heat recovery device recovers the waste heat of the rotary kiln cylinder, only about 50-60 degrees of hot water can be obtained, and the waste heat utilization rate is very low relative to about 250-350 degrees of heat on the surface of the rotary kiln cylinder.
Disclosure of Invention
The embodiment of the invention aims to provide a rotary kiln cylinder waste heat recovery system, which solves the problem that the waste heat utilization rate of the existing rotary kiln cylinder waste heat recovery device is very low.
In order to achieve the above object, an embodiment of the present invention provides a system for recycling waste heat from a cylinder of a rotary kiln, including:
rotating the kiln cylinder;
the sleeve is sleeved on the rotary kiln cylinder and provided with an air inlet and an air outlet, and a gap is formed between the inner surface of the sleeve and the outer surface of the rotary kiln cylinder;
the air supply outlet faces the air supply device of the air inlet;
the air suction device is arranged at the air outlet and the air suction inlet faces the air outlet;
and the waste heat boiler is communicated with the air suction device.
Optionally, the rotary kiln cylinder waste heat recovery system further comprises:
and the two ends of the induced draft fan are respectively connected with the waste heat boiler and the air supply device.
Optionally, the rotary kiln cylinder waste heat recovery system further comprises:
and the steam turbine generator unit is connected with the waste heat boiler and is used for generating power by utilizing the hot steam generated in the waste heat boiler.
Optionally, the steam turbine generator unit is electrically connected with a power supply system of the rotary kiln cylinder waste heat recovery system.
Optionally, the rotary kiln cylinder waste heat recovery system further comprises:
the steam condenser is connected with the turbo generator unit, the cooling tower is connected with the steam condenser, and the circulating water pump is connected with the cooling tower and the steam condenser at two ends respectively;
and the condensate pump is connected with the condenser, the deaerator is connected with the condensate pump, and the water feeding pump is connected with the deaerator and the waste heat boiler at two ends respectively.
Optionally, the waste heat boiler comprises an evaporator and an economizer, and the economizer is mounted at the lower part of the evaporator.
Optionally, the sleeve is made of carbon steel.
According to the rotary kiln cylinder waste heat recovery system in the embodiment of the invention, the sleeve with the air inlet and the air outlet is sleeved outside the rotary kiln cylinder, then the air supply device is used for blowing air towards the air inlet of the sleeve, and the air suction device is used for sucking air from the air outlet of the sleeve, so that heat on the surface of the rotary kiln cylinder can be concentrated in the sleeve to avoid loss, hot air of about 200 degrees can be generated after the air sent out by the air supply device flows through the surface of the rotary kiln cylinder, and the hot air can be finally sucked back to a waste heat boiler through the air suction device to be utilized, and therefore, the rotary kiln cylinder waste heat recovery system has high waste heat utilization rate.
Drawings
FIG. 1 is a schematic structural diagram of a rotary kiln drum waste heat recovery system provided in an embodiment of the present invention;
fig. 2 is an application schematic diagram of a rotary kiln cylinder waste heat recovery system provided by the embodiment of the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, an embodiment of the present invention provides a rotary kiln cylinder waste heat recovery system, including:
a rotary kiln cylinder 10;
the sleeve 11 is sleeved on the rotary kiln cylinder 10, the sleeve 11 is provided with an air inlet and an air outlet, and a gap is formed between the inner surface of the sleeve 11 and the outer surface of the rotary kiln cylinder 10;
the air supply device 12 with the air supply outlet facing the air inlet;
the air suction device 13 with the air suction opening facing the air outlet;
and a waste heat boiler 14 communicated with the air suction device 13.
In this embodiment, as shown in fig. 1, a sleeve 11 is sleeved on an outer surface of a rotary kiln cylinder 10, and a gap is provided between an inner surface of the sleeve 11 and an outer surface of the rotary kiln cylinder 10, and the gap may be specifically set at about 10 cm, so that the sleeve 11 may not only prevent heat on the outer surface of the rotary kiln cylinder 10 from radiating into the atmosphere to cause heat loss, but also ensure that heat can flow between the outer surface of the rotary kiln cylinder 10 and the inner surface of the sleeve 11.
The sleeve 11 is provided with an air inlet and an air outlet, and specifically, the air inlet and the air outlet can be respectively arranged on two opposite sides of the sleeve 11, so that the air flowing in from the air inlet can be in relatively long heat exchange contact with the outer surface of the rotary kiln cylinder 10, and the hot air with high heat content can be ensured to flow out from the air outlet.
The air supply outlet of air supply arrangement 12 is towards the air intake of sleeve 11, like this, air supply arrangement 12 can pass through the air intake to rotary kiln barrel 10 air supply, specifically can be to rotary kiln barrel 10 blows cold wind to when making the air flow through rotary kiln barrel 10 surface, can absorb the high temperature heat of rotary kiln barrel 10 surface and become the hot-air, and can be right simultaneously rotary kiln barrel 10 cools down, in order to improve rotary kiln barrel 10's operating condition, increase of service life. It should be noted that, in the present embodiment, the air supply device 12 may be a separate air supply device, such as a blower, which is not communicated with the heat recovery steam generator 14.
Induced draft device 13's inlet scoop orientation sleeve 11's air outlet, like this, induced draft device 13 can be to flowing through the hot-air that forms behind the rotary kiln barrel 10 surface carries out the resorption, thereby has reached right the high temperature waste heat of rotary kiln barrel 10 surface carries out the purpose of retrieving, and passes through sleeve 11 air supply arrangement 12 with induced draft device 13 can retrieve the hot-air about 200 degrees, and for the heat about 250 degrees ~ 350 degrees on rotary kiln barrel surface, waste heat utilization obtains increasing substantially.
The hot air recovered by the suction device 13 may be delivered to the exhaust heat boiler 14 through a pipeline, and the exhaust heat boiler 14 may further utilize the recovered hot air, such as power generation, heating, and the like by using heat of the recovered hot air.
Optionally, the rotary kiln cylinder waste heat recovery system further comprises:
and two ends of the waste heat boiler are respectively connected with the waste heat boiler 14 and the induced draft fan 15 of the air supply device 12.
In this embodiment, as shown in fig. 1, the rotary kiln cylinder waste heat recovery system may further include an induced draft fan 15, specifically, one end of the induced draft fan 15 is connected to the waste heat boiler through a pipeline, and the other end is connected to the air supply device 12 through a pipeline. In this way, the induced draft fan 15 can pump the air exhausted from the waste heat boiler 14 to the air blowing device 12, for example: the hot-air process induced draft device 13 is sent into in the exhaust-heat boiler 14, the process again become cold air after the exhaust-heat boiler 14 condensation cooling, draught fan 15 alright with exhaust cold air pump send to in the exhaust-heat boiler 14 air supply arrangement 12, with right rotary kiln barrel 10 dispels the heat and cools down.
Therefore, in this embodiment, the induced draft fan 15 is connected to the exhaust-heat boiler 14 and the air supply device 12, so that the air exhausted from the exhaust-heat boiler 14 can be recycled, and the purposes of energy conservation and emission reduction are achieved.
Optionally, the rotary kiln cylinder waste heat recovery system further comprises:
and the steam turbine generator unit 16 is connected with the waste heat boiler 14, and the steam turbine generator unit 16 is used for generating power by using the hot steam generated in the waste heat boiler 14.
In this embodiment, as shown in fig. 1, the rotary kiln cylinder waste heat recovery system further includes a steam turbine generator unit 16 connected to the waste heat boiler 14, specifically, the steam turbine generator unit 16 may include a steam drum 161 and a steam turbine generator 162, where two ends of the steam drum 161 are respectively connected to the waste heat boiler 14 and the steam turbine generator 162, the steam drum 161 is configured to perform steam-steam separation on hot steam exhausted from the waste heat boiler 14, the separated steam is sent to the steam turbine generator 162 to perform work power generation, the separated water may be sent back to the waste heat boiler 14, and electric energy generated by the steam turbine generator 162 through steam power generation may be used for power supply.
In this way, in this embodiment, by connecting the turbo generator unit 16 connected to the exhaust-heat boiler 14, steam can be generated by using the exhaust heat of the rotary kiln cylinder 10, and power can be generated by using the steam, so that the exhaust heat of the rotary kiln cylinder 10 can be effectively used.
Optionally, the steam turbine generator unit 16 is electrically connected to a power supply system of the rotary kiln cylinder waste heat recovery system.
In this embodiment, the turbo generator set 16 is electrically connected to the power supply system of the rotary kiln cylinder waste heat recovery system, so that the electric energy obtained by the turbo generator set 16 after generating electricity by using the steam generated by the waste heat of the rotary kiln cylinder 10 can be used for self-power supply of the rotary kiln cylinder waste heat recovery system, thereby reducing external power supply and achieving the purpose of saving energy.
Optionally, the rotary kiln cylinder waste heat recovery system further comprises:
a condenser 17 connected to the turbo generator unit 16, a cooling tower 18 connected to the condenser, and a circulating water pump 19 having both ends connected to the cooling tower 18 and the condenser 17, respectively;
and the condensate pump 20 is connected with the condenser, the deaerator 21 is connected with the condensate pump 20, and the water feeding pump 22 is connected with the deaerator 21 and the waste heat boiler 14 at two ends respectively.
In this embodiment, as shown in fig. 1, the system for recovering waste heat from a cylinder of a rotary kiln further includes a condenser 17, a cooling tower 18, a circulating water pump 19, a condensate pump 20, a deaerator 21, and a feed water pump 22, where the condenser 17 is connected to the turbine generator unit 16 for condensing exhaust steam of the turbine generator 162 into water, and the circulating water pump 19 is configured to deliver a cold source (such as cold water) in the cooling tower 18 to the condenser 17 for condensing the exhaust steam of the turbine generator 162.
The water after the condenser 17 is condensed is conveyed to the deaerator 21 through the condensate pump 20, the deaerator 21 deaerates the condensed water to prevent oxygen or other gases in the water from corroding equipment, and then the deaerated condensed water is conveyed back to the waste heat boiler 14 through the water feeding pump 22 to be recycled, so that energy conservation and emission reduction are realized.
It should be noted that, as shown in fig. 2, the steam turbine generator unit 16 may also generate power by using hot steam generated by the kiln head boiler 23 and the kiln tail boiler 24, and the feed water pump 22 may also be respectively communicated with the kiln head boiler 23 and the kiln tail boiler 24 to recycle exhaust steam of the steam turbine generator 162. The turbo generator set 16 can be incorporated into the original power generation system of the rotary kiln cylinder waste heat recovery system to the rotary kiln cylinder waste heat recovery system carries out self-power supply, and then reduces external power supply, for example: the rotary kiln cylinder waste heat recovery system originally consumes about thirty thousand degrees of electricity, and can generate about eight thousand degrees of electricity through the steam turbine generator unit 16, and only needs to be connected with external power supply electric energy of about twenty thousand degrees.
Optionally, the waste heat boiler 14 includes an evaporator 141 and an economizer 142, and the economizer 142 is installed at a lower portion of the evaporator 141.
In this embodiment, as shown in fig. 1, the exhaust-heat boiler 14 includes an evaporator 141 and an economizer 142, the evaporator 141 is located at the upper portion of the exhaust-heat boiler 14 and is communicated with the air suction device 13, so that hot air delivered by the air suction device 13 can generate low-temperature saturated steam by performing heat convection with cold water in the evaporator 141, and the low-temperature saturated steam is delivered to the steam turbine generator 162 for steam power generation after being subjected to steam-steam separation by the steam drum 161.
Economizer 142 is located exhaust-heat boiler 14's lower part is used for retrieving evaporator 141 carries out the waste heat after the condensation cooling to the hot-air, economizer 142 can with draught fan 15 is linked together, and like this, the warp air after the evaporator 141 cooling will pass through economizer 142 gets into draught fan 15, again by draught fan 15 pump send extremely air supply arrangement 12 to can realize the cyclic utilization to the air after the cooling.
Optionally, the sleeve 11 is made of carbon steel.
In this embodiment, the sleeve 11 may be made of carbon steel, and the carbon steel has high strength and high temperature resistance, so that the sleeve is very suitable for being sleeved on the outer surface of the rotary kiln cylinder to prevent heat loss on the surface of the rotary kiln cylinder, and the carbon steel has low price and excellent processing performance, thereby saving the manufacturing cost of the sleeve 11.
This embodiment provides a rotary kiln barrel waste heat recovery system, establishes the sleeve that is equipped with air intake and air outlet through at the outside cover of rotary kiln barrel, then utilizes air supply arrangement orientation telescopic air intake is bloied to the utilization device that induced drafts follows telescopic air outlet induced drafts, like this, not only can concentrate the heat on rotary kiln barrel surface in order to avoid losing in the sleeve, moreover because the air current that air supply arrangement sent out can produce the hot-air about 200 degrees behind the rotary kiln barrel surface, and the final accessible of this hot-air induced draft the device resorption to waste heat boiler in with the utilization, thereby rotary kiln barrel waste heat recovery system possesses higher waste heat utilization ratio.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A rotary kiln cylinder waste heat recovery system, comprising:
rotating the kiln cylinder;
the sleeve is sleeved on the rotary kiln cylinder and provided with an air inlet and an air outlet, and a gap is formed between the inner surface of the sleeve and the outer surface of the rotary kiln cylinder;
the air supply outlet faces the air supply device of the air inlet;
the air suction device is arranged at the air outlet and the air suction inlet faces the air outlet;
and the waste heat boiler is communicated with the air suction device.
2. The rotary kiln drum waste heat recovery system of claim 1, further comprising:
and the two ends of the induced draft fan are respectively connected with the waste heat boiler and the air supply device.
3. The rotary kiln drum waste heat recovery system of claim 1, further comprising:
and the steam turbine generator unit is connected with the waste heat boiler and is used for generating power by utilizing the hot steam generated in the waste heat boiler.
4. The rotary kiln drum waste heat recovery system of claim 3, wherein the turbo generator set is electrically connected to a power supply system of the rotary kiln drum waste heat recovery system.
5. The rotary kiln drum waste heat recovery system as claimed in claim 3 or 4, further comprising:
the steam condenser is connected with the turbo generator unit, the cooling tower is connected with the steam condenser, and the circulating water pump is connected with the cooling tower and the steam condenser at two ends respectively;
and the condensate pump is connected with the condenser, the deaerator is connected with the condensate pump, and the water feeding pump is connected with the deaerator and the waste heat boiler at two ends respectively.
6. The rotary kiln drum waste heat recovery system according to any one of claims 1 to 4, wherein the waste heat boiler comprises an evaporator and an economizer mounted to a lower portion of the evaporator.
7. The rotary kiln cylinder waste heat recovery system of any one of claims 1 to 4, wherein the sleeve is made of carbon steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810870188.3A CN110793337A (en) | 2018-08-02 | 2018-08-02 | Rotary kiln barrel waste heat recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810870188.3A CN110793337A (en) | 2018-08-02 | 2018-08-02 | Rotary kiln barrel waste heat recovery system |
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| Publication Number | Publication Date |
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| CN110793337A true CN110793337A (en) | 2020-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810870188.3A Pending CN110793337A (en) | 2018-08-02 | 2018-08-02 | Rotary kiln barrel waste heat recovery system |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1601214A (en) * | 2004-09-30 | 2005-03-30 | 中信重型机械公司 | Generating set system of simple low temperature waste heat from large size cement manufacture line in dry method, and technical process |
| CN201203355Y (en) * | 2008-01-25 | 2009-03-04 | 钱建荣 | Heat radiation reutilization apparatus of cement rotary kiln barrel |
| CN102636022A (en) * | 2012-04-28 | 2012-08-15 | 中国科学院广州能源研究所 | Cylinder wall residual heat recovery and heat transfer device of dry method cement rotary kiln |
| CN202494325U (en) * | 2012-03-21 | 2012-10-17 | 中冶赛迪工程技术股份有限公司 | Lime rotary kiln residue heat recovery device |
| CN103047854A (en) * | 2012-12-25 | 2013-04-17 | 中冶长天国际工程有限责任公司 | Energy-saving rotary kiln with long service life |
| CN103822496A (en) * | 2014-03-11 | 2014-05-28 | 洛阳水泥工程设计研究院有限公司 | Adjustable rotary kiln heat collection system and heat energy collection method |
| DE102014010044B3 (en) * | 2014-06-27 | 2015-12-24 | Khd Humboldt Wedag Gmbh | Waste heat recovery process in a cement production plant and cement production plant |
-
2018
- 2018-08-02 CN CN201810870188.3A patent/CN110793337A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1601214A (en) * | 2004-09-30 | 2005-03-30 | 中信重型机械公司 | Generating set system of simple low temperature waste heat from large size cement manufacture line in dry method, and technical process |
| CN201203355Y (en) * | 2008-01-25 | 2009-03-04 | 钱建荣 | Heat radiation reutilization apparatus of cement rotary kiln barrel |
| CN202494325U (en) * | 2012-03-21 | 2012-10-17 | 中冶赛迪工程技术股份有限公司 | Lime rotary kiln residue heat recovery device |
| CN102636022A (en) * | 2012-04-28 | 2012-08-15 | 中国科学院广州能源研究所 | Cylinder wall residual heat recovery and heat transfer device of dry method cement rotary kiln |
| CN103047854A (en) * | 2012-12-25 | 2013-04-17 | 中冶长天国际工程有限责任公司 | Energy-saving rotary kiln with long service life |
| CN103822496A (en) * | 2014-03-11 | 2014-05-28 | 洛阳水泥工程设计研究院有限公司 | Adjustable rotary kiln heat collection system and heat energy collection method |
| DE102014010044B3 (en) * | 2014-06-27 | 2015-12-24 | Khd Humboldt Wedag Gmbh | Waste heat recovery process in a cement production plant and cement production plant |
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Application publication date: 20200214 |
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