CN104329948B - A kind of device utilizing cement rotary kiln preheating air by flue gas afterheat - Google Patents
A kind of device utilizing cement rotary kiln preheating air by flue gas afterheat Download PDFInfo
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- CN104329948B CN104329948B CN201410557315.6A CN201410557315A CN104329948B CN 104329948 B CN104329948 B CN 104329948B CN 201410557315 A CN201410557315 A CN 201410557315A CN 104329948 B CN104329948 B CN 104329948B
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- 239000003546 flue gas Substances 0.000 title claims abstract description 36
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 239000004568 cement Substances 0.000 title claims abstract description 20
- 239000000428 dust Substances 0.000 claims abstract description 38
- 230000005484 gravity Effects 0.000 claims abstract description 21
- 239000002918 waste heat Substances 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 9
- 239000010959 steel Substances 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 239000000779 smoke Substances 0.000 claims abstract description 5
- 239000011449 brick Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 239000013589 supplement Substances 0.000 abstract description 3
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
Classifications
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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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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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Joints Allowing Movement (AREA)
Abstract
本发明公开了一种利用水泥回转窑烟气余热预热空气的装置，有效提高水泥回转窑的热能利用率。该装置包括：螺纹法兰、加肋管、法兰、壳体、耐火衬、密封圈、重力除尘接头、除尘端盖、低支座和高支座。本发明热效率较高、介质流阻较小。烟气与空气逆向流动，实现逆向换热。设置的耐火衬保温蓄热，耐火衬温度升高，高温的耐火衬表面对加肋管的辐射传热，有效地补充了加肋管的给热量。加肋管内外壁设置的14个长条形直肋片，肋片增大了对流换热面积，强化了传热；本发明还具有除尘功能。壳体通过其上的弧形凸块嵌入于高低不同的两支座内，使整个装置与水平面呈一定倾角，并在钢壳烟气出气口处设置有重力除尘接头，方便除尘。
The invention discloses a device for preheating air by using the waste heat of flue gas from a cement rotary kiln, which can effectively improve the heat energy utilization rate of the cement rotary kiln. The device includes: threaded flange, ribbed pipe, flange, shell, refractory lining, sealing ring, gravity dust removal joint, dust removal end cover, low support and high support. The invention has high thermal efficiency and small medium flow resistance. Flue gas and air flow in reverse to realize reverse heat exchange. The installed refractory lining keeps heat and stores heat, the temperature of the refractory lining rises, and the high-temperature refractory lining surface radiates heat transfer to the ribbed tube, which effectively supplements the heat given by the ribbed tube. The 14 elongated straight fins arranged on the inner and outer walls of the ribbed tube increase the convective heat transfer area and strengthen the heat transfer; the invention also has the function of dust removal. The shell is embedded in two supports with different heights through the arc-shaped protrusions on it, so that the whole device has a certain inclination angle with the horizontal plane, and a gravity dust removal joint is installed at the smoke outlet of the steel shell to facilitate dust removal.
Description
技术领域technical field
本发明涉及烟气余热利用装置，特别是一种利用水泥回转窑烟气余热预热空气的装置。The invention relates to a flue gas waste heat utilization device, in particular to a device for preheating air by utilizing the waste heat of flue gas from a cement rotary kiln.
背景技术Background technique
水泥回转窑工业生产过程中，采用煤粉作为燃料时，燃烧会消耗大量的煤粉，同时产生大量高温烟气。有些水泥窑窑尾废烟气温度可达600℃，这些废烟气被直接排放到大气中，浪费了大量的能源，污染了空气。而煤粉燃烧过程中需要鼓入大量的空气，而鼓入的空气温度较低会影响燃烧效率。利用烟气余热预热空气是一种较好的节能方式，而现有的空气预热器虽然传热效率较高，但空气流阻大，要求鼓风机的功率增加较大，并不适合水泥回转窑的所需的燃烧空气预热。因此需要一种高效换热且流阻小的燃烧空气预热器。In the industrial production process of cement rotary kiln, when pulverized coal is used as fuel, the combustion will consume a large amount of pulverized coal and produce a large amount of high-temperature flue gas at the same time. The temperature of some cement kiln waste flue gas can reach 600°C. These waste flue gases are directly discharged into the atmosphere, wasting a lot of energy and polluting the air. In the pulverized coal combustion process, a large amount of air needs to be blown in, and the low temperature of the blown air will affect the combustion efficiency. Preheating the air by using the waste heat of the flue gas is a better energy-saving method. Although the existing air preheater has a high heat transfer efficiency, it has a large air flow resistance and requires a large increase in the power of the blower, which is not suitable for cement rotation. The combustion air required for the kiln is preheated. Therefore, a combustion air preheater with high heat exchange efficiency and small flow resistance is required.
发明内容Contents of the invention
本发明提供一种利用水泥回转窑烟气余热预热空气的装置，有效提高水泥回转窑的热能利用率。The invention provides a device for preheating air by using the waste heat of flue gas from a cement rotary kiln, which can effectively improve the heat energy utilization rate of the cement rotary kiln.
本发明提供的一种利用水泥回转窑烟气余热预热空气的装置包括：螺纹法兰、加肋管、法兰、壳体、耐火衬、密封圈、重力除尘接头、除尘端盖、低支座和高支座，所述壳体由两个半圆形钢壳通过螺栓联接而成，其内表面设有耐火衬，耐火衬材料为蜡石砖；加肋管处于壳体内部，加肋管由两个半圆的环状钢结构和两段带螺纹的光管焊接而成，加肋管内表面焊有沿轴向方向的14条直肋片，加肋管内部流动空气，加肋管外表面同壳体内部的耐火衬之间形成烟道，烟气在烟道中流动，加肋管和壳体通过法兰、密封圈及螺栓联接并密封，加肋管两侧轴端分别与螺纹法兰联接，螺纹法兰同外界管道接口进行对接；壳体通过其上的弧形凸块嵌入于低支座和高支座内；在烟气出口处设有重力除尘接头，在重力除尘接头下部设除尘端盖。The invention provides a device for preheating air by using the residual heat of flue gas from a cement rotary kiln, including: threaded flanges, ribbed pipes, flanges, shells, refractory linings, sealing rings, gravity dust removal joints, dust removal end covers, low branch Seat and high support, the shell is composed of two semicircular steel shells connected by bolts, the inner surface is provided with refractory lining, and the refractory lining material is wax stone brick; the ribbed pipe is inside the shell, and the ribbed The tube is welded by two semicircular ring-shaped steel structures and two sections of threaded plain tubes. The inner surface of the ribbed tube is welded with 14 straight fins along the axial direction. The air flows inside the ribbed tube, and the outer surface of the ribbed tube A flue is formed between the surface and the refractory lining inside the shell, and the flue gas flows in the flue. The ribbed pipe and the shell are connected and sealed by flanges, sealing rings and bolts. The threaded flange is connected with the external pipe interface; the shell is embedded in the low support and the high support through the arc-shaped protrusions on it; there is a gravity dust removal joint at the flue gas outlet, and a gravity dust removal joint under the gravity dust removal joint. Set the dust removal end cover.
所述加肋管的两端为光管，光管穿过带孔的法兰与螺纹法兰旋合。Both ends of the ribbed pipe are light pipes, and the light pipe passes through the flange with holes and is screwed into the threaded flange.
所述法兰为圆形，开有沟槽，与加肋管光管配合处形成阻烟密封，法兰外缘开有8个圆孔，通过螺栓与壳体的凸缘相连接，壳体外缘与法兰外缘为凹凸配合结构。The flange is circular and has a groove, which forms a smoke-resistant seal at the joint with the ribbed light pipe. There are 8 round holes on the outer edge of the flange, which are connected to the flange of the shell through bolts. The edge and the outer edge of the flange are a concave-convex matching structure.
所述重力除尘接头为二通式，呈横“T”字型结构。The gravity dust removal joint is a two-way type, which is in the shape of a horizontal "T".
本发明的显著有益效果体现在：Significant beneficial effect of the present invention is reflected in:
1.热效率较高、介质流阻较小1. High thermal efficiency and small medium flow resistance
烟气与空气逆向流动，实现逆向换热。逆向换热提高了换热效率；设置的耐火衬保温蓄热，耐火衬温度升高，高温的耐火衬表面对加肋管的辐射传热，有效地补充了加肋管的给热量；加肋管内外壁设置的14个长条形直肋片，对烟气和空气流阻影响不大，肋片增大了对流换热面积，强化了传热，更有利于空气的温升；可拆装式结构方便实现烟道内部及肋片外表面的清灰处理，可有效地抑制灰阻，提高传热效率。Flue gas and air flow in reverse to realize reverse heat exchange. The reverse heat transfer improves the heat transfer efficiency; the refractory lining is installed for heat preservation and heat storage, the temperature of the refractory lining rises, and the high-temperature refractory lining surface radiates heat transfer to the ribbed tube, which effectively supplements the heat given by the ribbed tube; The 14 long strip-shaped straight fins set on the inner and outer walls of the tube have little effect on the flue gas and air flow resistance. The fins increase the convective heat transfer area, strengthen the heat transfer, and are more conducive to the temperature rise of the air; they can be disassembled The type structure facilitates the cleaning of the inside of the flue and the outer surface of the fins, which can effectively suppress the dust resistance and improve the heat transfer efficiency.
2.具有除尘功能2. With dust removal function
壳体通过其上的弧形凸块嵌入于高低不同的两支座内，使整个装置与水平面呈一定倾角，并在钢壳烟气出气口处设置有重力除尘接头，方便除尘。The shell is embedded in two supports with different heights through the arc-shaped protrusions on it, so that the whole device has a certain inclination angle with the horizontal plane, and a gravity dust removal joint is installed at the smoke outlet of the steel shell to facilitate dust removal.
附图说明Description of drawings
图1是一种利用水泥回转窑烟气余热预热空气的装置的立体结构图。Fig. 1 is a three-dimensional structure diagram of a device for preheating air by utilizing waste heat of flue gas from a cement rotary kiln.
图2是一种利用水泥回转窑烟气余热预热空气的装置的局部断面图。Fig. 2 is a partial sectional view of a device for preheating air by using waste heat of flue gas from a cement rotary kiln.
图3是一种利用水泥回转窑烟气余热预热空气的装置的加肋管结构图。Fig. 3 is a structural diagram of a ribbed tube for preheating air using waste heat of flue gas from a cement rotary kiln.
图4是一种利用水泥回转窑烟气余热预热空气的装置的壳体结构图。Fig. 4 is a shell structure diagram of a device for preheating air by utilizing waste heat of flue gas from a cement rotary kiln.
图5是一种利用水泥回转窑烟气余热预热空气的装置的重力除尘接头结构图。Fig. 5 is a structure diagram of a gravity dust removal joint of a device for preheating air by utilizing waste heat of flue gas from a cement rotary kiln.
图中标记如下：螺纹法兰1、加肋管2、法兰3、钢壳4、耐火衬5、密封圈6、重力除尘接头7、除尘端盖8、低支座9、高支座10。The marks in the figure are as follows: threaded flange 1, ribbed pipe 2, flange 3, steel shell 4, refractory lining 5, sealing ring 6, gravity dust removal joint 7, dust removal end cover 8, low support 9, high support 10 .
具体实施方式detailed description
如图1～5所示，一种利用水泥回转窑烟气余热预热空气的装置，该装置包括：螺纹法兰1、加肋管2、法兰3、壳体4、耐火衬5、密封圈6、重力除尘接头7、除尘端盖8、低支座9和高支座10，所述壳体4由两个半圆形钢壳通过螺栓联接而成，其内表面设有耐火衬5，耐火衬材料为蜡石砖；加肋管2处于壳体4内部，加肋管2由两个半圆的环状钢结构和两段带螺纹的光管焊接而成，加肋管的两端为光管，光管穿过带孔的法兰与螺纹法兰旋合，加肋管2内外表面焊有沿轴向方向的14条直肋片，加肋管2内部流动空气，加肋管2外表面同壳体4内部的耐火衬之间形成烟道，烟气在烟道中流动，加肋管2和壳体4通过法兰3、密封圈6及螺栓联接并密封，其中法兰3为圆形，内侧开有沟槽，与加肋管光管配合处形成阻烟密封，法兰3外缘开有8个圆孔，通过螺栓与壳体的凸缘相连接。壳体4外缘与法兰3外缘为凹凸配合结构；加肋管2两侧轴端分别与螺纹法兰1联接，螺纹法兰1同外界管道接口进行对接；壳体4通过其上的弧形凸块嵌入于低支座9和高支座10内；在烟气出口处设有重力除尘接头7，重力除尘接头为二通式，呈横“T”字型结构，在重力除尘接头7下部设除尘端盖8。As shown in Figures 1 to 5, a device for preheating air using waste heat from cement rotary kiln flue gas, the device includes: threaded flange 1, ribbed pipe 2, flange 3, shell 4, refractory lining 5, sealing Ring 6, gravity dust removal joint 7, dust removal end cover 8, low support 9 and high support 10, the shell 4 is composed of two semicircular steel shells connected by bolts, and its inner surface is provided with a refractory lining 5 , the refractory lining material is wax stone bricks; the ribbed pipe 2 is inside the shell 4, and the ribbed pipe 2 is welded by two semicircular ring-shaped steel structures and two sections of threaded light pipes, and the two ends of the ribbed pipe It is a light pipe, the light pipe passes through the flange with holes and screwed with the threaded flange, the inner and outer surfaces of the ribbed pipe 2 are welded with 14 straight fins along the axial direction, the air flows inside the ribbed pipe 2, and the ribbed pipe 2. A flue is formed between the outer surface and the refractory lining inside the shell 4, and the flue gas flows in the flue. The ribbed pipe 2 and the shell 4 are connected and sealed by the flange 3, the sealing ring 6 and the bolts, among which the flange 3 It is circular, with a groove on the inner side, forming a smoke-resistant seal at the joint with the ribbed light pipe. There are 8 round holes on the outer edge of the flange 3, which are connected to the flange of the shell through bolts. The outer edge of the shell 4 and the outer edge of the flange 3 have a concave-convex matching structure; the shaft ends on both sides of the ribbed pipe 2 are respectively connected with the threaded flange 1, and the threaded flange 1 is connected with the external pipe interface; The arc-shaped protrusion is embedded in the low support 9 and the high support 10; there is a gravity dust removal joint 7 at the flue gas outlet, and the gravity dust removal joint is a two-way type with a horizontal "T" structure. The bottom of the 7 is provided with a dust removal end cover 8.
本发明运行方式如下：The mode of operation of the present invention is as follows:
风机与空气进口相连，由左下方鼓入空气，空气流经加肋管，由右上方空气出口流出；烟气由炉窑导入右上方烟气进口，流经壳体与加肋管之间的空间后经烟气出口流出，其间空气与烟气逆向流动，实现逆流换热。The fan is connected with the air inlet, blows in the air from the lower left, the air flows through the ribbed tube, and flows out from the upper right air outlet; the flue gas is introduced from the kiln into the upper right flue gas inlet, and flows through the gap between the shell and the ribbed tube After the space, it flows out through the flue gas outlet, during which the air and flue gas flow in reverse to realize countercurrent heat exchange.
耐火衬用于保温蓄热，耐火衬温度升高，高温的耐火衬表面对加肋管的辐射传热，有效地补充了加肋管的给热量。然后通过肋片导热把热量传递给空气。耐火衬起“二次热源”作用。The refractory lining is used for heat preservation and heat storage. The temperature of the refractory lining rises, and the high-temperature refractory lining surface radiates heat transfer to the ribbed tube, which effectively supplements the heat given by the ribbed tube. The heat is then transferred to the air through the heat conduction of the fins. The refractory lining acts as a "secondary heat source".
当烟气灰尘达到一定程度，打开壳体，清理肋片表面及烟道内部灰尘。有利于减小灰阻，强化传热。When the flue gas dust reaches a certain level, open the shell and clean the dust on the surface of the ribs and inside the flue. It is beneficial to reduce gray resistance and enhance heat transfer.
烟气出口与重力除尘装置相连，在重力和阻力作用下，烟气灰尘会堆积到重力除尘接头底部的灰坑中，工作过程中可以随时旋开重力除尘接头的除尘端盖，完成灰尘清理工作。The flue gas outlet is connected to the gravity dust removal device. Under the action of gravity and resistance, the flue gas dust will accumulate in the ash pit at the bottom of the gravity dust removal joint. During the working process, the dust removal end cover of the gravity dust removal joint can be unscrewed at any time to complete the dust cleaning work. .
Claims (4)
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| CN201410557315.6A CN104329948B (en) | 2014-10-20 | 2014-10-20 | A kind of device utilizing cement rotary kiln preheating air by flue gas afterheat |
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| CN104748570A (en) * | 2015-04-10 | 2015-07-01 | 中国瑞林工程技术有限公司 | Method of using hot air of air cooler |
| CN110986574B (en) * | 2019-12-25 | 2021-07-09 | 东方希望重庆水泥有限公司 | A rotary kiln equipment for cement production |
| CN114136531B (en) * | 2021-11-26 | 2023-05-09 | 辽宁科技大学 | A multifunctional aviation pipeline detection device |
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| CN104329948A (en) | 2015-02-04 |
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