CN114111326B - Cement rotary kiln comprehensive noise reduction and heat recovery system - Google Patents
Cement rotary kiln comprehensive noise reduction and heat recovery system Download PDFInfo
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- CN114111326B CN114111326B CN202111260523.6A CN202111260523A CN114111326B CN 114111326 B CN114111326 B CN 114111326B CN 202111260523 A CN202111260523 A CN 202111260523A CN 114111326 B CN114111326 B CN 114111326B
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
- F04D29/664—Sound attenuation by means of sound absorbing material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/668—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps damping or preventing mechanical vibrations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/38—Arrangements of cooling devices
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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
- F27D9/00—Cooling of furnaces or of charges therein
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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
- 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
- F27D9/00—Cooling of furnaces or of charges therein
- F27D2009/0002—Cooling of furnaces
- F27D2009/0005—Cooling of furnaces the cooling medium being a gas
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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 discloses a cement rotary kiln comprehensive noise reduction and heat recovery system, which comprises a rotary kiln platform arranged at the bottom of a rotary kiln, a cooling coil pipe arranged at the top of the rotary kiln, air pipe air supply units arranged at two ends of the rotary kiln platform, a fan arranged at the input end of the air pipe air supply unit and a noise elimination mechanism arranged on the fan; a fan damper is arranged below the fan; the fan sound insulation cover is arranged on the outer cover of the fan; the silencing mechanism comprises a fan inlet silencer and a fan outlet silencer, and fan noise is reduced through the fan inlet silencer, the fan outlet silencer, the fan sound insulation cover and the fan damper; the cooling air from the air pipe air supply unit turns into hot air after cooling treatment of the rotary kiln, and the cooling coil recovers heat from the hot air and heat radiation of the rotary kiln, so as to cool and waste heat recover the rotary kiln body in the production process of the rotary kiln of the cement factory.
Description
Technical Field
The invention belongs to the technical field of cement factory rotary kiln noise reduction and heat recovery, and particularly relates to a cement rotary kiln comprehensive noise reduction and heat recovery system.
Background
The rotary kiln cement is a method for producing cement, is a new technology for producing cement, has good quality and stable performance, and can reduce environmental pollution; the original cement production is to use a vertical kiln, the cement produced by the technology has poor quality, unstable performance and serious environmental pollution, and has been eliminated, the country has not allowed to use the technology to produce cement, and the existing rotary kiln cement technology basically adopted in large cement factories replaces the traditional vertical kiln cement.
However, in the running process of the rotary kiln, a large amount of stable heat is generated, the surface temperature is generally 200-350 ℃, cooling treatment is needed, and at present, most cement plants generally have two schemes for cooling the rotary kiln: the first is that a plurality of large-air-quantity high-noise axial flow fans are arranged along the dividing point of the rotary kiln, and the scheme superimposes dozens of fan noises, so that the noise value at the rotary kiln is often over 110dB (A) (the noise sanitary standard prescribes that the noise tolerance standard of the working place is 85dB (A)), and the rotary kiln is positioned in an open space, so that the energy of hot air heated by the rotary kiln is directly discharged into the atmosphere, thereby causing serious noise pollution, heat pollution and energy waste and seriously threatening the occupational health of maintenance staff; the second kind is concentrated air supply, and through pipeline delivery to a plurality of wind gap of arranging along cement mill's rotary kiln, and fan air supply pipeline often does not process through the noise elimination, leads to a plurality of wind gap noise stack equally, even fan noise reachs the rotary kiln wind gap after through the transmission tube, appears the condition that the rotary kiln goes out the noise ratio fan export noise increase, and just the same with above first scheme, most amount of wind heat all discharges to the atmosphere.
At present, vibration reduction, noise reduction and heat recovery are not basically considered in the two schemes, so that a great amount of noise pollution, heat pollution and serious energy waste are generated in the production process of the rotary kiln. With the recent improvement of environmental awareness and occupational health awareness, cement plants are becoming important as customers for carbon emission and noise emission, and carbon emission indexes and noise indexes. Therefore, a cement mill rotary kiln device which is reasonable in structural design, small in noise pollution and capable of recycling waste heat is urgently needed, and the problems of large noise pollution, heat pollution and serious energy waste in the cement production process of the rotary kiln in the prior art are solved.
Disclosure of Invention
Aiming at the defects or improvement demands of the prior art, the invention provides a cement rotary kiln comprehensive noise reduction and heat recovery system, which comprehensively considers noise reduction and heat recovery, ensures the noise reduction effect, increases the heat recovery, and reduces carbon emission and heat pollution; meanwhile, the noise reduction measures increase the heat recovered by heating, the required cooling air quantity is reduced by heat recovery, and therefore energy is saved and noise is reduced from the source. In addition, the cooling coil is used as a heat recovery pipe and simultaneously forms a sound barrier, so that the noise radiation direction can be changed, and the noise is reduced from the propagation path; the invention reduces carbon emission by heat recovery, can save a large number of carbon emission indexes, and is beneficial to cost reduction and synergy of cement factories; can solve the problems of a great deal of noise pollution, heat pollution and serious energy waste generated in the cement production process of the rotary kiln in the prior art.
In order to achieve the above purpose, the invention provides a cement rotary kiln comprehensive noise reduction and heat recovery system, which comprises a rotary kiln platform arranged at the bottom of a rotary kiln, a cooling coil arranged at the top of the rotary kiln, an air pipe air supply unit arranged at one end of the rotary kiln platform and used for conveying cooling air to the rotary kiln, a fan arranged at the input end of the air pipe air supply unit and a noise elimination mechanism arranged on the fan; wherein,
a fan damper is arranged below the fan and used for controlling the influence of the fan vibration and the fan secondary radiation sound on the surrounding environment; the fan sound insulation cover is arranged outside the fan and used for controlling the fan body to radiate noise; the noise elimination mechanism comprises a fan inlet muffler arranged at the inlet end of the fan and a fan outlet muffler arranged at the outlet end of the fan, and the noise value outside the fan noise elimination cover is greatly reduced under the combined action of the fan inlet muffler, the fan outlet muffler, the fan noise elimination cover and the fan vibration damper;
the cooling coil comprises a first coil end for entering cold fluid and a second coil end which is positioned below the first coil end and used for discharging the cold fluid, and the cooling coil is used for maximizing the recovered heat energy of the cooling coil; the cooling air from the air pipe air supply unit changes the cooling air into hot air after cooling treatment of the rotary kiln, the hot air continuously sweeps the cooling coil from the lower side of the cooling coil, meanwhile, the rotary kiln continuously radiates heat energy to the cooling coil, and the cooling coil recovers heat from the hot air, heat radiation and heat convection of the rotary kiln, and further cools and recovers waste heat of a rotary kiln body in the production process of the rotary kiln of a cement factory.
Further, the calculation formula of the recovered heat is as follows:
Q＝∑C liquid m Liquid (T 2 -T 1 )＝∑(C Air-conditioner m Air-conditioner (T 3 -T 4 )+σA 0 T 0 4 X (0,1) )η
Wherein Q is the recovered heat of the cooling coil from hot air and heat radiation of the rotary kiln; a is that 0 The cross-sectional area of the rotary kiln is shown as sigma, the gray scale is shown as X (0, 1), the angular coefficient of the rotary kiln to coil radiation is shown as eta, and the heat transfer efficiency is shown as eta; t (T) 1 Is the temperature of the cold fluid as it enters from the first end of the coil; t (T) 2 Is the temperature of the cold fluid as it exits the second end of the coil; t (T) 3 The temperature of the hot air after the cooling air from the air pipe air supply unit passes through the rotary kiln; t (T) 4 The temperature of the hot air after continuously sweeping the cooling coil from the lower side of the cooling coil; t (T) 0 The surface temperature of the rotary kiln; c (C) Liquid For specific heat capacity of the cooling liquid, m Liquid C is the mass flow of the cooling liquid Air-conditioner Is the specific heat capacity, m of air Air-conditioner For mass air flow across the cooling coil.
Further, the air duct air supply unit comprises a flexible air duct connecting section arranged at one end of the fan, a first flexible air duct conveying section and a first flexible air duct elbow section arranged at the output end of the flexible air duct connecting section, a second flexible air duct elbow section arranged at the output end of the first flexible air duct conveying section, a second flexible air duct conveying section respectively arranged at the output ends of the first flexible air duct elbow section and the second flexible air duct elbow section, flexible air duct static pressure and air distribution sections respectively arranged at the output ends of the two second flexible air duct conveying sections, and a plurality of flexible air duct air distribution openings arranged on the flexible air duct static pressure and the air distribution sections;
the flexible air pipe static pressure and the air distribution sections are oppositely arranged on the rotary kiln platform at intervals;
the flexible air pipe air distribution openings are respectively arranged at the two sides of the rotary kiln platform at intervals at the output ends of the flexible air pipe static pressure and air distribution sections.
Further, the section of the static pressure and air distribution section of the flexible air pipe is rectangular, and the height of the noise barrier of the air pipe is changed by adjusting the length-width ratio of the static pressure section, so that the noise and air flow direction are changed, and the rotary kiln platform and the sensitive point at the lower part of the rotary kiln platform are positioned in the sound-shadow area of the static pressure section.
Further, the flexible air pipe air distribution opening is spherical and is used for adjusting the wind speed and the wind direction of the fan;
the rotary kiln is arranged between the flexible air pipe air distribution openings on two sides of the central axis above the rotary kiln platform.
Further, the first flexible air pipe conveying section is paved along the bottom of the port of the rotary kiln platform; the two second flexible air pipe conveying sections are arranged at intervals in parallel perpendicular to the first flexible air pipe conveying sections;
the first flexible air pipe elbow section, the first flexible air pipe conveying section, the second flexible air pipe elbow section and the two second flexible air pipe conveying sections jointly form a U-shaped with an upward opening, and the U-shaped opening is consistent with the outline of the cross section of the rotary kiln platform.
Further, a fan speed regulating device is arranged between the fan and the fan outlet muffler and used for regulating the air output of the fan.
Further, the cooling coil is single tube single-tube or multi-tube.
Further, the cooling coil is a hard tube with a heat conduction coefficient of more than or equal to 80W/(m.K) so as to improve heat recovery efficiency.
Further, the rotary kiln platform is square-tube-shaped;
the static pressure of the flexible air pipe and the length of the air distribution section are matched with the length of the rotary kiln.
In general, the above technical solutions conceived by the present invention, compared with the prior art, enable the following beneficial effects to be obtained:
(1) The invention relates to a cement rotary kiln comprehensive noise reduction and heat recovery system, a rotary kiln platform is arranged below a rotary kiln, a large-air-volume fan is arranged beside the end part of the rotary kiln platform, a muffler device is respectively arranged at an inlet and an outlet of the fan to control inlet and outlet noises of the fan, and a sound insulation cover is arranged outside the fan to control radiation noises of a fan body and enable the noise value outside the sound insulation cover of the fan to be lower than 85dB (A); a fan damper is arranged below the fan to control the vibration and the influence of secondary radiation sound on the surrounding environment; an air quantity regulating valve or an air quantity variable fan is arranged on the fan to control the air quantity and the outlet air pressure; the flexible air pipe unit is symmetrically arranged along two sides of the rotary kiln, the cooling coil pipe for heat recovery is arranged at the top of the rotary kiln, and hot air flow in the flexible air pipe is led to the top cooling coil pipe through the fan and the flexible air pipe, so that heat recovery heat is increased; the invention adopts concentrated air supply, improves the efficiency of the fan, and avoids the situation of higher noise value caused by superposition of a large number of fans in the traditional scheme; can solve the problems of a great deal of noise pollution, heat pollution and serious energy waste generated in the cement production process of the rotary kiln in the prior art.
(2) The cement rotary kiln comprehensive noise reduction and heat recovery system adopts the flexible air pipe, is convenient to install, disassemble and control because the surface density of the flexible air pipe is much lower than that of the traditional air pipe, and simultaneously saves a large amount of supporting steel materials and construction space and construction cost; in addition, when the flexible heat-preserving air pipe is adopted, the loss of cold energy is reduced, and the cooling effect is improved. The flexible air pipe has lower friction resistance, is more energy-saving in transmission and can greatly reduce the energy consumption of the air blower. In particular, the flexible air pipe is made of fabric with a rubber-plastic heat-insulating sound-absorbing layer and can ensure the supporting structure of the appearance of the air pipe under the windless condition.
(3) The invention relates to a cement rotary kiln comprehensive noise reduction and heat recovery system, which is characterized in that a flexible air pipe static pressure and an air distribution section are creatively arranged on a rotary kiln platform, the section of the flexible air pipe static pressure and the air distribution section is designed to be rectangular, the height of an air pipe sound barrier is changed by adjusting the length-width ratio of the flexible air pipe static pressure and the air distribution section, so that a sensitive point of the rotary kiln platform and the lower part of the rotary kiln platform is positioned in a sound-shadow area of the static pressure and the air distribution section, and an air port is arranged at a proper height, so that an air port noise source is controlled, and the noise and air flow direction are changed; meanwhile, the flexible air pipe is a poor heat conductor, the heat conductivity coefficient is far lower than that of metal, the static pressure and the air distribution section are used as heat barriers, the radiation heat angle coefficient of the cross section of the rotary kiln to the cooling coil pipe is improved, the effect of guiding airflow to the cold water coil pipe is achieved, and the heat recovery efficiency is greatly improved; by setting the length-width ratio and the height position of the tuyere noise source, the tuyere noise source can play a role of a sound barrier and a heat barrier, so that the noise and airflow directions are changed; in addition, the safety barrier can also play a role in preventing the falling of maintenance personnel.
(4) According to the cement rotary kiln comprehensive noise reduction and heat recovery system, the noise reduction effect of the adopted flexible air pipe is obvious, and the air outlet of the flexible air pipe is spherical, so that on one hand, the noise of the rotary kiln can be reduced to be below 85dBA, on the other hand, the air quantity, the air direction and the air speed of a fan can be conveniently adjusted on site, the thermal stress deformation of the rotary kiln caused by improper setting of the cooling air position is avoided, the system adaptability is improved, and the system design difficulty is reduced.
(5) According to the cement rotary kiln comprehensive noise reduction and heat recovery system, the fan vibration damper, the fan inlet and outlet muffler and the fan sound insulation cover are arranged on the fan, the flexible air pipe is provided with the inner heat insulation layer with a certain sound absorption function, noise in the propagation process is reduced, and therefore noise pollution of a concentrated air supply fan can be effectively avoided.
(6) According to the cement rotary kiln comprehensive noise reduction and heat recovery system, the flexible air pipe with low friction resistance is adopted for cooling the rotary kiln, and particularly, the flexible air pipe is internally provided with the internal heat insulation material which has the sound absorption function and is a heat bad conductor, so that the noise propagation along a transmission pipeline and the heat loss can be controlled; the flexible air pipe is made of fabric with a rubber-plastic heat-insulating sound-absorbing layer, a supporting structure capable of guaranteeing the appearance of the air pipe under the windless condition is arranged in the air pipe, and the supporting structure can be used for fixing the flexible air pipe; the flexible air pipe has lower self weight, lower bearing and supporting requirements and convenient installation, disassembly and cleaning.
(7) According to the cement rotary kiln comprehensive noise reduction and heat recovery system, the cooling water pipe is arranged at the top of the rotary kiln, so that the air quantity required by cooling is greatly reduced, and energy conservation and noise reduction are facilitated; meanwhile, a large amount of energy is taken away by the cooling water, and the energy can be used for absorbing refrigeration heat recovery or directly supplying heat energy to the periphery in winter, so that the energy utilization rate is improved, and the carbon emission is reduced.
Drawings
FIG. 1 is a schematic diagram showing the front view structure of a cement rotary kiln integrated noise reduction and heat recovery system according to an embodiment of the present invention;
FIG. 2 is a schematic three-dimensional structure of a cement rotary kiln integrated noise reduction and heat recovery system according to an embodiment of the invention;
FIG. 3 is a schematic side view of a cement rotary kiln integrated noise reduction and heat recovery system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of specific friction of different ductwork;
fig. 5 is a schematic diagram of a cooling coil structure of a cement rotary kiln integrated noise reduction and heat recovery system according to an embodiment of the invention.
Like reference numerals denote like technical features throughout the drawings, in particular: 1-rotary kiln, 11-rotary kiln platform, 12-cooling coil, 121-first end of tube disc, 122-second end of tube disc, 13-air duct air supply unit, 131-flexible air duct connecting section, 132-first flexible air duct conveying section, 133-first flexible air duct elbow section, 134-second flexible air duct elbow section, 135-second flexible air duct conveying section, 136-flexible air duct static pressure and air distribution section, 137-flexible air duct air distribution opening, 14-rotary kiln rotating mechanism, 2-fan, 21-fan sound insulation cover, 22-fan speed regulating device, 23-fan shock absorber, 3-silencing mechanism, 31-fan inlet silencer and 32-fan outlet silencer.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
In the description of the present invention, it will be understood that when an element is referred to as being "mounted," "disposed," or "disposed" on another element, it can be directly on the other element or be indirectly on the other element unless explicitly stated and limited otherwise. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element; the terms "mounted," "connected," and "provided" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "first", "second". The term "may include one or more of the feature, either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present invention, it should be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 1-5, the invention provides a cement rotary kiln comprehensive noise reduction and heat recovery system, which comprises a rotary kiln platform 11 arranged at the bottom of a rotary kiln 1, a cooling coil 12 arranged at the top of the rotary kiln 1, an air pipe air supply unit 13 arranged at one end of the rotary kiln platform 11 and used for conveying cooling air to the rotary kiln, a fan 2 arranged at the input end of the air pipe air supply unit 13 and a noise elimination mechanism 3 arranged on the fan 2; a fan damper 23 is arranged below the fan 2 and is used for controlling the influence of secondary radiation sound caused by the vibration of the fan 2 and the vibration of the fan body on the surrounding environment; the fan 2 is externally covered with a fan sound insulation cover 21 for controlling the fan body to radiate noise; the silencing mechanism 3 comprises a fan inlet silencer 31 arranged at the inlet end of the fan 2 and a fan outlet silencer 32 arranged at the outlet end of the fan 2, and the noise value outside the fan sound-proof cover is greatly reduced under the combined action of the fan inlet silencer 31, the fan outlet silencer 32, the fan sound-proof cover 21 and the fan damper 23; the cooling coil 12 includes a coil first end 121 for cold fluid ingress and a coil second end 122 below the coil first end for cold fluid egress for maximizing the recovered thermal energy of the cooling coil 12; the cooling air from the air pipe air supply unit 12 changes the cooling air into hot air after cooling treatment of the rotary kiln 1, the hot air continuously sweeps the cooling coil 12 from the lower side of the cooling coil 12, meanwhile, the rotary kiln 1 also continuously radiates heat energy to the cooling coil 12, and the cooling coil 12 recovers heat from the hot air and the heat radiation of the rotary kiln 1, so that the rotary kiln body in the production process of the rotary kiln of a cement factory is cooled and waste heat is recovered, and the problems of a large amount of noise pollution, heat pollution and serious energy waste generated in the production process of cement of the rotary kiln in the prior art are solved.
Further, as shown in fig. 1-5, the rotary kiln 1 is provided with a rotary kiln rotating mechanism 14 for rotating the rotary kiln; the rotary kiln platform 11 is square, the length of the rotary kiln platform is matched with the length of the rotary kiln 1, and the rotary kiln platform is used for supporting the rotary kiln 1 so as to enable the rotary kiln to normally operate; the air duct air supply unit 13 comprises a flexible air duct connecting section 131 arranged at one end of the fan 2, a first flexible air duct conveying section 132 and a first flexible air duct elbow section 133 arranged at the output end of the flexible air duct connecting section 131, a second flexible air duct elbow section 134 arranged at the output end of the first flexible air duct conveying section 132, a second flexible air duct conveying section 135 respectively arranged at the output ends of the first flexible air duct elbow section 133 and the second flexible air duct elbow section 134, flexible air duct static pressure and air distribution sections 136 respectively arranged at the output ends of the two second flexible air duct conveying sections 135, and a plurality of flexible air duct air distribution openings 137 arranged on the flexible air duct static pressure and air distribution sections 136; the first flexible air pipe conveying section 132 is paved along the bottom of the port of the rotary kiln platform 11; the two second flexible air duct conveying sections 135 are arranged in parallel and at intervals perpendicular to the first flexible air duct conveying sections 132; the first flexible air duct elbow section 133, the first flexible air duct conveying section 132, the second flexible air duct elbow section 134 and the two second flexible air duct conveying sections 135 together form a U-shape with an upward opening, and the U-shape is consistent with the outline of the cross section of the rotary kiln platform 11; the static pressure and air distribution sections 136 of the flexible air pipe are arranged on the rotary kiln platform 11 at opposite intervals, and the lengths of the static pressure and air distribution sections 136 of the flexible air pipe are matched with the lengths of the rotary kiln 1. The flexible air pipe air distribution openings 137 are respectively and uniformly arranged at intervals at the output ends of the flexible air pipe static pressure and air distribution sections 136 at the two sides of the rotary kiln platform; the flexible air pipe air distribution opening 137 is spherical and is used for adjusting the wind speed and the wind direction of the fan; the rotary kiln 1 is arranged between the flexible air pipe air distribution openings 137 on two sides of the central axis above the rotary kiln platform 11; the spherical air port is arranged to locally regulate the air quantity, the air direction and the air speed of the fan so as to increase the adaptability and the adjustability of the system; according to the invention, the flexible air pipes are uniformly distributed on the two sides of the rotary kiln platform, and are connected with the fan outlet through the flexible air pipe elbow so as to transmit cooling air to the rotary kiln, and the adopted flexible air pipes have a heat preservation function, so that heat loss in the transmission process can be avoided; the length-width ratio of the static pressure section of the flexible air pipe is adjusted, the height of the air pipe sound barrier is changed, so that the rotary kiln platform and the sensitive point at the lower part of the rotary kiln platform are positioned in the sound-shadow area of the static pressure section, namely, the static pressure and air distribution section of the flexible air pipe are innovatively arranged on the rotary kiln platform, and the effects of the sound barrier and the heat barrier can be achieved by arranging the length-width ratio and the height position of the air distribution noise source, so that the noise and air flow direction are changed; in addition, the safety barrier can also play a role in preventing the falling of maintenance personnel; the flexible air pipe adopted by the invention has smaller specific friction and low heat conductivity coefficient, and compared with other types of air pipes, the specific friction is shown as figure 4, and the economic air velocity ratio of the flexible air pipe is more than 7m/s and is the smallest; in addition, the flexible air pipe has the advantages of light weight, easy installation, easy disassembly, corrosion resistance, fire resistance, long service life and the like; the flexible air pipe is a poor conductor of heat, the heat conductivity coefficient is far lower than that of metal, the static pressure section of the flexible air pipe is used as a heat barrier, the radiation heat angle coefficient of the cross section of the rotary kiln to the cold water coil pipe is improved, the effect of guiding airflow to the cold water coil pipe is achieved, and the heat recovery efficiency is greatly improved; the flexible air pipe is made of fabric with a rubber-plastic heat-insulating sound-absorbing layer, and a supporting structure capable of ensuring the appearance of the air pipe under the windless condition is arranged in the flexible air pipe; the flexible air pipe has lower self weight, the support keels are arranged in the air pipe, the shape of the air pipe can be kept, the flexible air pipe is fixed on other structures, the requirements on bearing and support are lower, and the flexible air pipe is convenient to install, detach and clean.
Further, as shown in fig. 1-5, the fan 2 is externally covered with a fan sound insulation cover 21 for controlling the fan body to radiate noise, the sound insulation cover is made of modularized sound insulation plates, and a sound insulation access door is arranged, so that the maintenance is convenient; the silencing mechanism 3 comprises a fan inlet silencer 31 arranged at the inlet end of the fan 2 and a fan outlet silencer 32 arranged at the outlet end of the fan 2; a fan speed regulating device 22 is arranged between the fan 1 and the fan outlet muffler 32; the air output of the fan is regulated through the fan speed regulating device 22, and meanwhile, the air speed and the air direction of the fan are regulated through the spherical flexible air pipe air distribution opening 137, so that the difficulty in matching a heat dissipation system can be greatly reduced; the fan inlet muffler, the fan outlet muffler and the sound insulation cover are arranged on the fan, so that the noise value outside the fan sound insulation cover is lower than 85dBA; a fan damper 23 is arranged below the fan 2 to control the influence of fan vibration and fan secondary radiation sound on the surrounding environment.
Further, as shown in FIGS. 1-5, the cooling coil 12 may be a single tube type, or may be a multi-tube type for increasing the heat recovered; the cooling coil 12 adopts a hard tube with a heat conduction coefficient of more than or equal to 80W/(m.K), preferably a brass tube, so as to improve heat recovery efficiency; the cooling coil 12 includes a coil first end 121 for cold fluid to enter and a coil second end 122 below the coil first end, cold fluid entering from the coil first end 121 (where the cold fluid temperature is T1) and exiting from the coil second end 122 (where the cold fluid temperature is T2); after the hot air (temperature T3) continuously passes through the cooling coil from the lower side, the temperature becomes T4; the surface temperature of the rotary kiln is T0, heat energy is continuously radiated to the cooling coil, the heat recovered by the cooling coil 12 from hot air and heat radiation of the rotary kiln is Q, wherein the calculation formula of the recovered heat Q is as follows:
Q＝∑C liquid m Liquid (T2-T1)＝∑(C Air-conditioner m Air-conditioner (T 3 -T 4 )+σA 0 T 0 4 X (0,1) )η
Wherein A is 0 Is the cross-sectional area of the rotary kiln, sigma is gray scale, X (0, 1) is the angular coefficient of the rotary kiln to the radiation of the coil, eta is the heat transfer efficiency, T 1 Is the temperature of the cold fluid as it enters from the coil first end 121; t (T) 2 Is the temperature at which the cold fluid exits the coil second end 122; t (T) 3 The temperature of the hot air after the cooling air from the air pipe air supply unit 13 passes through the rotary kiln; t (T) 4 Is the temperature of the hot air after continuously sweeping the cooling coil 12 from the underside thereof; t (T) 0 The surface temperature of the rotary kiln; c (C) Liquid For specific heat capacity of the cooling liquid, m Liquid C is the mass flow of the cooling liquid Air-conditioner Is the specific heat capacity, m of air Air-conditioner For mass air flow across the cooling coil.
The heat recovered by the cooling coil is divided into two parts, wherein one part is the heat radiation energy of the rotary kiln and the other part is the recovered hot air energy; in the heat recovery process, in order to increase the recovered heat, the cooling water adopts a mode of up-in and down-out, so that the recovered heat energy reaches the maximum value; meanwhile, heat of the rotary kiln is timely taken away through heat recovery, so that the cold energy requirement for hot air cooling is reduced, the energy consumption is indirectly reduced, and the power of a required fan is reduced.
The invention provides a working principle of a cement rotary kiln comprehensive noise reduction and heat recovery system, which comprises the following steps: a rotary kiln platform is arranged below the rotary kiln, a large-air-volume fan is arranged beside the end part of the rotary kiln platform, a sound-damping device is respectively arranged at an inlet and an outlet of the fan to control inlet and outlet noises of the fan, and a sound-insulating cover is covered outside the fan to control the fan body to radiate the noises, so that the noise value outside the sound-insulating cover of the fan is lower than 85dB (A); the sound insulation cover is made of modularized sound insulation plates and is provided with a sound insulation access door so as to be convenient to overhaul at any time; a fan damper is arranged below the fan to control the vibration and the influence of secondary radiation sound on the surrounding environment; an air quantity regulating valve or an air quantity variable fan is arranged on the fan to control the air quantity and the outlet air pressure; a cooling coil pipe and a waste heat recovery system for heat recovery are arranged at the top of the rotary kiln, a flexible air pipe conveying section and a flexible air pipe elbow are arranged at the outlet end of the fan and used for conveying cooling air, and the flexible air pipes are symmetrically arranged along the two sides of the rotary kiln, so that hot air flow in the flexible air pipes is led to the cooling coil pipe at the top, and the heat of heat recovery is increased; the adopted flexible air pipe has lower self weight, the air pipe is internally provided with the supporting keels, the appearance shape of the air pipe can be kept, the requirements on bearing and supporting are lower, and the installation, the disassembly and the cleaning are convenient; the flexible air pipe also has a heat preservation function, so that heat loss in the transmission process can be avoided; the section of the static pressure and air distribution section of the flexible air pipe is rectangular, the height of the air pipe sound barrier is changed by adjusting the static pressure of the flexible air pipe and the length-width ratio of the air distribution section, so that the sensitive points of the rotary kiln platform and the lower part of the rotary kiln platform are positioned in the sound-shadow area of the static pressure and air distribution section, and the air port noise source is controlled by arranging the air port at a proper height; meanwhile, the flexible air pipe is a poor heat conductor, the heat conductivity coefficient is far lower than that of metal, the static pressure and the air distribution section are used as heat barriers, the radiation heat angle coefficient of the cross section of the rotary kiln to the cooling coil pipe is improved, the effect of guiding airflow to the cold water coil pipe is achieved, and the heat recovery efficiency is greatly improved; the air outlet of the flexible air pipe is spherical, so that the air quantity, the air direction and the air speed of the fan can be adjusted on site, thermal stress deformation of the rotary kiln caused by improper arrangement of the cooling air position is avoided, the adaptability of the system is improved, and the design difficulty of the system is reduced; according to the invention, the noise reduction and the heat recovery are comprehensively considered, so that the noise reduction effect is ensured, the heat recovery is increased, and the carbon emission and the heat pollution are reduced; meanwhile, the noise reduction measures increase the heat recovered by heating, the required cooling air quantity is reduced by heat recovery, and therefore energy is saved and noise is reduced from the source. In addition, the cooling coil is used as a heat recovery pipe and simultaneously is equivalent to a shutter type sound barrier, so that the radiation direction of noise is changed, and noise is reduced from the propagation path; the heat recovery reduces carbon emission, can save a large number of carbon emission indexes, and is beneficial to cost reduction and synergy of cement factories; can solve the problems of a great deal of noise pollution, heat pollution and serious energy waste generated in the cement production process of the rotary kiln in the prior art.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The utility model provides a cement rotary kiln comprehensive noise reduction and heat recovery system which characterized in that: the device comprises a rotary kiln platform (11) arranged at the bottom of a rotary kiln (1), a cooling coil (12) arranged at the top of the rotary kiln (1), an air pipe air supply unit (13) arranged at one end of the rotary kiln platform (11) and used for conveying cooling air to the rotary kiln, a fan (2) arranged at the input end of the air pipe air supply unit (13) and a silencing mechanism (3) arranged on the fan (2); wherein,
a fan damper (23) is arranged below the fan (2) and used for controlling the influence of the vibration of the fan (2) and secondary radiation sound of the fan on the surrounding environment; the fan (2) is externally covered with a fan sound insulation cover (21) for controlling the radiation noise of the fan body; the silencing mechanism (3) comprises a fan inlet silencer (31) arranged at the inlet end of the fan (2) and a fan outlet silencer (32) arranged at the outlet end of the fan (2), and the noise value outside the fan sound insulation cover is greatly reduced through the combined action of the fan inlet silencer (31), the fan outlet silencer (32), the fan sound insulation cover (21) and the fan vibration damper (23);
the cooling coil (12) includes a coil first end (121) for cold fluid ingress and a coil second end (122) below the coil first end for cold fluid egress for maximizing recovered heat energy of the cooling coil (12); the cooling air from the air pipe air supply unit (13) is used for changing the cooling air into hot air after cooling treatment of the rotary kiln (1), the hot air continuously sweeps the cooling coil (12) from the lower side of the cooling coil (12), meanwhile, the rotary kiln (1) also continuously radiates heat energy to the cooling coil (12), and the cooling coil (12) recovers heat from the hot air, heat radiation and heat convection of the rotary kiln (1), so as to cool a rotary kiln body in the production process of the rotary kiln of a cement plant and recover waste heat.
2. The cement rotary kiln integrated noise reduction and heat recovery system according to claim 1, wherein: the calculation formula of the recovered heat is as follows:
wherein Q is the recovered heat of the cooling coil (12) from hot air and heat radiation of the rotary kiln (1); a is that 0 The cross-sectional area of the rotary kiln is shown as sigma, the gray scale is shown as X (0, 1), the angular coefficient of the rotary kiln to coil radiation is shown as eta, and the heat transfer efficiency is shown as eta; t (T) 1 Is the temperature of the cold fluid as it enters from the first end (121) of the coil; t (T) 2 Is the temperature of the cold fluid exiting the second end (122) of the coil; t (T) 3 The temperature of hot air after cooling air from the air pipe air supply unit (13) passes through the rotary kiln; t (T) 4 Is the temperature of the hot air after continuously sweeping the cooling coil (12) from the lower side of the cooling coil; t (T) 0 The surface temperature of the rotary kiln; c (C) Liquid For specific heat capacity of the cooling liquid, m Liquid C is the mass flow of the cooling liquid Air-conditioner Is the specific heat capacity, m of air Air-conditioner For mass air flow across the cooling coil.
3. The cement rotary kiln integrated noise reduction and heat recovery system according to claim 2, wherein: the air duct air supply unit (13) comprises a flexible air duct connecting section (131) arranged at one end of the fan (2), a first flexible air duct conveying section (132) and a first flexible air duct elbow section (133) arranged at the output end of the flexible air duct connecting section (131), a second flexible air duct elbow section (134) arranged at the output end of the first flexible air duct conveying section (132), a second flexible air duct conveying section (135) respectively arranged at the output ends of the first flexible air duct elbow section (133) and the second flexible air duct elbow section (134), flexible air duct static pressure and air distribution sections (136) respectively arranged at the output ends of the two second flexible air duct conveying sections (135), and a plurality of flexible air duct air distribution openings (137) arranged on the flexible air duct static pressure and air distribution sections (136);
the flexible air pipe static pressure and air distribution sections (136) are oppositely arranged on the rotary kiln platform (11) at intervals;
the flexible air pipe air distribution openings (137) are respectively arranged at the two sides of the rotary kiln platform at intervals at the output ends of the flexible air pipe static pressure and air distribution sections (136).
4. A cement rotary kiln integrated noise reduction and heat recovery system according to claim 3, wherein: the section of the static pressure and air distribution section (136) of the flexible air pipe is rectangular, and the height of the noise barrier of the air pipe is changed by adjusting the length-width ratio of the static pressure section, so that the noise and air flow direction are changed, and the rotary kiln platform and the sensitive point at the lower part of the rotary kiln platform are positioned in the sound-shadow area of the static pressure section.
5. A cement rotary kiln integrated noise reduction and heat recovery system according to claim 3 or 4, characterized in that: the flexible air pipe air distribution opening (137) is spherical and is used for adjusting the wind speed and the wind direction of the fan;
the rotary kiln (1) is arranged between the flexible air pipe air distribution openings (137) on two sides of the central axis above the rotary kiln platform (11).
6. The cement rotary kiln integrated noise reduction and heat recovery system according to claim 5, wherein: the first flexible air pipe conveying section (132) is paved along the bottom of the port of the rotary kiln platform (11); the two second flexible air pipe conveying sections (135) are arranged in parallel and at intervals perpendicular to the first flexible air pipe conveying sections (132);
the first flexible air pipe elbow section (133), the first flexible air pipe conveying section (132), the second flexible air pipe elbow section (134) and the two second flexible air pipe conveying sections (135) jointly form a U-shaped with an upward opening, and the U-shaped opening is consistent with the outline of the cross section of the rotary kiln platform (11).
7. A cement rotary kiln integrated noise reduction and heat recovery system according to any of claims 1-4 or 6, characterized in that: and a fan speed regulating device (22) is further arranged between the fan (2) and the fan outlet muffler (32) and used for regulating the air output of the fan.
8. A cement rotary kiln integrated noise reduction and heat recovery system according to any of claims 1-4 or 6, characterized in that: the cooling coil (12) is single tube single-tube or multi-tube.
9. A cement rotary kiln integrated noise reduction and heat recovery system according to any of claims 1-4 or 6, characterized in that: the cooling coil (12) is a hard tube with a heat conduction coefficient of more than or equal to 80W/(m.K) so as to improve heat recovery efficiency.
10. A cement rotary kiln integrated noise reduction and heat recovery system according to any of claims 1-4 or 6, characterized in that: the rotary kiln platform (11) is square;
the length of the static pressure and air distribution section (136) of the flexible air pipe is matched with the length of the rotary kiln (1).
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| DE2419486A1 (en) * | 1973-04-27 | 1974-11-14 | Hatschek Zementwerke Ag H | Acoustically shielded outdoor rotary kiln - having heat resistant screens around satellite cooling drums |
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