CN110068224A - The off-gas recovery of grate down-draft drying zone and preheating section utilizes and exhaust system - Google Patents
The off-gas recovery of grate down-draft drying zone and preheating section utilizes and exhaust system Download PDFInfo
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- CN110068224A CN110068224A CN201910485410.2A CN201910485410A CN110068224A CN 110068224 A CN110068224 A CN 110068224A CN 201910485410 A CN201910485410 A CN 201910485410A CN 110068224 A CN110068224 A CN 110068224A
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- 238000001035 drying Methods 0.000 title claims abstract description 47
- 238000011084 recovery Methods 0.000 title claims abstract description 6
- 239000003546 flue gas Substances 0.000 claims abstract description 114
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 113
- 238000001816 cooling Methods 0.000 claims abstract description 40
- 239000000428 dust Substances 0.000 claims description 24
- 239000012717 electrostatic precipitator Substances 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 238000007605 air drying Methods 0.000 claims description 11
- 238000000746 purification Methods 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 9
- 238000004064 recycling Methods 0.000 claims description 9
- 230000001172 regenerating effect Effects 0.000 claims description 5
- 239000008188 pellet Substances 0.000 abstract description 16
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 238000000605 extraction Methods 0.000 abstract description 11
- 230000009467 reduction Effects 0.000 abstract description 2
- 239000003570 air Substances 0.000 description 83
- 238000000034 method Methods 0.000 description 12
- 239000007789 gas Substances 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
- F27B21/02—Sintering grates or tables
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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
- F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
- F27D15/02—Cooling
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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
- F27D17/20—Arrangements for treatment or cleaning of waste gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2001/00—Composition, conformation or state of the charge
- F27M2001/02—Charges containing ferrous elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2001/00—Composition, conformation or state of the charge
- F27M2001/18—Composition, conformation or state of the charge in the form of pellets
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Drying Of Solid Materials (AREA)
- Furnace Details (AREA)
Abstract
本发明涉及一种链箅机抽风干燥段和预热段烟气回收利用及排放系统，包括链箅机、链箅机上罩及风箱，环冷机、环冷机上罩及风箱，链箅机回热风系统，环冷机回热风系统和烟气外排处理系统；所述的链箅机上罩分为鼓风干燥段、抽风干燥段、预热一段和预热二段，其特征在于：所述的链箅机风箱分为三组，风箱Ⅰ对应鼓风干燥段，风箱Ⅱ对应抽风干燥段和预热一段前半段风箱Ⅲ对应预热一段后半段和预热二段；风箱Ⅱ和风箱Ⅲ分别通过烟气支管连接链箅机回热风系统、环冷机回热风系统和烟气外排系统；本发明的优点是：使链箅机回热风温度可调，将一部分预热段烟气作为冷却风回收利用，降低外排的烟气量，为球团生产过程精确控制和节能减排创造条件。
The invention relates to a flue gas recovery, utilization and discharge system in the extraction and drying section and the preheating section of a chain grate machine. The hot air system, the hot air return system of the ring cooler and the exhaust treatment system of the flue gas; the upper cover of the chain grate machine is divided into a blast drying section, a suction drying section, a preheating section and a preheating section, characterized in that: the The chain grate bellows are divided into three groups, the bellows I corresponds to the blast drying section, the bellows II corresponds to the exhaust drying section and the first half of the preheating section, and the first half of the bellows III corresponds to the second half of the preheating section and the second preheating section; The heat return air system of the chain grate machine, the heat return air system of the ring cooler and the flue gas discharge system are respectively connected through the flue gas branch pipe; The cooling air is recycled and used to reduce the amount of exhausted flue gas, creating conditions for precise control of the pellet production process and energy saving and emission reduction.
Description
技术领域technical field
本发明属于钢铁冶金工业球团矿生产技术领域，具体涉及一种链箅机抽风干燥段和预热段烟气回收利用及排放系统。The invention belongs to the technical field of pellet production in the iron and steel metallurgical industry, and particularly relates to a flue gas recovery, utilization and discharge system in the extraction and drying section and the preheating section of a chain grate machine.
背景技术Background technique
目前，链箅机-回转窑-环冷机工艺是铁矿球团生产的主要生产工艺之一，常用的热风流程是将链箅机分为三室（三组）四段，根据热气流温度和穿过料层的方式将链箅机上罩分为鼓风干燥段、抽风干燥段、预热一段、预热二段共四段；根据热气流走向将与链箅机上罩四段对应的链箅机风箱分为三组：第一组风箱对应鼓风干燥段，接受来自环冷机三冷段上罩的冷却废气，用作鼓风干燥的介质；第二组风箱对应抽风干燥段和预热一段，抽风干燥段和预热一段的烟气汇集后，全部由外排系统处理后排入大气；第三组风箱对应预热二段，预热二段的热烟气汇集后，由回热风系统处理后返回抽风干燥段上罩，用作抽风干燥的介质。At present, the chain grate machine-rotary kiln-ring cooler process is one of the main production processes for iron ore pellet production. The commonly used hot air process is to divide the chain grate machine into three chambers (three groups) and four sections. The upper cover of the chain grate machine is divided into four sections, including the blast drying section, the exhaust air drying section, the first section of preheating, and the second section of preheating by passing through the material layer; The bellows are divided into three groups: the first group of bellows corresponds to the blast drying section, and receives the cooling exhaust gas from the upper cover of the third cooling section of the ring cooler, which is used as the medium for blast drying; the second group of bellows corresponds to the exhaust drying section and preheating In the first stage, the flue gas from the exhaust air drying section and the preheating section is collected, and all the flue gases are processed by the external exhaust system and then discharged into the atmosphere; the third group of bellows corresponds to the second preheating section. After the system is processed, it is returned to the upper cover of the extraction and drying section, which is used as the medium for extraction and drying.
鼓风干燥段是在链箅机上对生球进行处理的第一道工序，用于鼓风干燥的热源是来自环冷机三冷段上罩的冷却废气，自下而上的热气流通过生球料层，初步脱除生球水分。The blast drying section is the first process of processing the green balls on the chain grate machine. The heat source for blast drying is the cooling exhaust gas from the upper cover of the third cooling section of the ring cooler, and the hot air from bottom to top passes through the raw material. The pellet layer is initially removed from the raw pellet moisture.
抽风干燥段是在链箅机上对生球进行处理的第二道工序，用于抽风干燥的热源是来自链箅机回热风机的热烟气（以下简称“回热风”），自上而下的热气流通过生球料层，脱除生球水分，作为抽风干燥热源的气流温度是根据球团试验确定的。The extraction air drying section is the second process of processing the raw balls on the chain grate machine. The heat source for extraction air drying is the hot flue gas from the heat recovery fan of the chain grate machine (hereinafter referred to as "return heat air"), from top to bottom The hot air flow through the raw pellet material layer removes the moisture of the raw pellets, and the airflow temperature as the heat source for the exhaust air drying is determined according to the pellet test.
预热一段是链箅机上的过渡环节，预热一段热源是来自环冷机二冷段上罩的热废气（以下简称“二冷段废气”），自上而下的热气流通过生球料层，将生球剩余水分全部脱除，并将干球加热使其根据需要升温。The first stage of preheating is the transition link on the chain grate machine. The heat source of the first stage of preheating is the hot exhaust gas from the upper cover of the second cooling section of the ring cooler (hereinafter referred to as "second cooling section exhaust gas"), and the hot air from top to bottom passes through the raw pellets. layer, remove all the remaining moisture of the green balls, and heat the dry balls to heat up as needed.
预热二段是在链箅机上对生球进行处理的最后一道工序，来自回转窑的热烟气自上而下穿过料层，将干球在适宜温度下预热一定的时间，使干球强度满足入窑的要求，穿过料层的烟气作为“回热风”由回热风机送往抽风干燥段上罩作为热源。The second stage of preheating is the last process of processing the raw balls on the chain grate machine. The hot flue gas from the rotary kiln passes through the material layer from top to bottom, and the dry balls are preheated at a suitable temperature for a certain period of time to make the dry balls dry. The strength of the ball meets the requirements of entering the kiln, and the flue gas passing through the material layer is sent to the upper cover of the extraction and drying section as a heat source as "return heat" by the heat return fan.
实际生产过程中，在原料条件、生产操作等各种因素的影响下，来自预热二段风箱的烟气温度或高或低，与抽风干燥需要的温度会有一定的差距。在预热二段的烟气温度偏高时，为了满足抽风干燥的需要，一般通过兑入一定量的环境空气来降温，兑入空气会加大回热风系统的负担；在预热二段的烟气温度偏低时，不能满足抽风干燥的需要，无法达到预期的生球脱水效果，将影响链箅机上的预热过程，从而造成链箅机上的工序后移，轻则影响产量，严重时会使预热球指标偏低，造成粉尘量加大、回转窑结圈等后果，影响生产稳定和球团矿质量。In the actual production process, under the influence of various factors such as raw material conditions and production operations, the temperature of the flue gas from the preheating second-stage bellows will be higher or lower, and there will be a certain gap between the temperature required for extraction and drying. When the temperature of the flue gas in the second preheating stage is too high, in order to meet the needs of ventilation and drying, a certain amount of ambient air is generally added to cool down, which will increase the burden of the return hot air system; When the flue gas temperature is too low, it cannot meet the needs of ventilation and drying, and cannot achieve the expected dehydration effect of green balls, which will affect the preheating process on the chain grate machine, which will cause the process on the chain grate machine to move backward, which will affect the output in light cases, and in serious cases. The index of preheating ball will be low, resulting in the increase of dust volume and the formation of rings in the rotary kiln, which will affect the stability of production and the quality of pellets.
另外，按照上述热风流程，抽风干燥段和预热一段的烟气混合后温度较高，直接排入大气是一种浪费；而且这部分烟气量较大，要全部经过脱硫、脱硝后才能排入大气，在环保方面有一定的压力。因此，合理回收利用抽风干燥段和预热一段烟气的热量，减轻环保压力是十分必要的。In addition, according to the above hot air process, the temperature of the flue gas in the drying section and the preheating section is high after mixing, and it is a waste to directly discharge it into the atmosphere; and this part of the flue gas has a large volume, and it can only be discharged after desulfurization and denitrification. Into the atmosphere, there is a certain pressure in environmental protection. Therefore, it is very necessary to reasonably recycle the heat of the exhaust air drying section and the preheating section of flue gas to reduce the pressure on environmental protection.
发明内容SUMMARY OF THE INVENTION
本发明的目的是提供一种链箅机抽风干燥段和预热段烟气回收利用及排放系统，用于实现精确控制“回热风”温度，满足链箅机抽风干燥段对风温和风量的需求，同时，充分利用烟气余热、减少外排烟气量。The purpose of the present invention is to provide a flue gas recycling and discharging system in the extraction and drying section of the chain grate machine and the preheating section, which is used to accurately control the temperature of the "returning hot air" and meet the requirements of the air temperature and air volume in the extraction and drying section of the chain grate machine. , At the same time, make full use of the waste heat of flue gas and reduce the amount of exhaust gas.
本发明的目的是通过下述技术方案实现的：The purpose of this invention is to realize through following technical scheme:
本发明的一种链箅机抽风干燥段和预热段烟气回收利用及排放系统，包括链箅机、链箅机上罩及链箅机风箱，环冷机、环冷机上罩及环冷机风箱，链箅机回热风系统，环冷机回热风系统和烟气外排处理系统；所述的链箅机上罩沿链箅机运动方向依次分为鼓风干燥段、抽风干燥段、预热一段和预热二段，所述的环冷机上罩沿环冷机运动方向依次分为一冷段、二冷段和三冷段，其特征在于：所述的链箅机风箱分为三组，第一组风箱Ⅰ对应鼓风干燥段，第二组风箱Ⅱ对应抽风干燥段和预热一段前半段，第三组风箱Ⅲ对应预热一段后半段和预热二段；第二组风箱Ⅱ和第三组风箱Ⅲ分别通过各自的烟气支管连接链箅机回热风系统、环冷机回热风系统和烟气外排处理系统；The present invention provides a system for recycling and discharging flue gas in the exhaust air drying section and the preheating section of the chain grate machine, including the chain grate machine, the chain grate machine upper cover and the chain grate machine bellows, the ring cooler, the ring cooler upper cover and the ring cooler. The bellows, the chain grate return hot air system, the ring cooler return hot air system and the flue gas effluent treatment system; the chain grate upper cover is divided into blast drying section, exhaust air drying section, preheating section along the movement direction of the chain grate machine. One stage and two preheating stages, the upper cover of the ring cooler is divided into a cooling section, a second cooling section and a third cooling section in turn along the movement direction of the ring cooler, and it is characterized in that: the chain grate bellows are divided into three groups , the first group of bellows I corresponds to the blast drying section, the second group of bellows II corresponds to the exhaust drying section and the first half of the preheating section, the third group of bellows III corresponds to the second half of the preheating section and the second preheating section; the second group of bellows The bellows II and the third group of bellows III are respectively connected to the chain grate heat return air system, the ring cooler return heat air system and the flue gas effluent treatment system through their respective flue gas branch pipes;
所述的链箅机回热风系统包括链箅机回热风总管、回热风除尘器Ⅰ、回热风连接管道Ⅰ和回热风机Ⅰ，所述的第三组风箱Ⅲ与所述的链箅机回热风总管通过烟气支管Ⅰ连接，所述的回热风除尘器Ⅰ进口与所述的链箅机回热风总管连接，回热风除尘器Ⅰ出口通过回热风连接管道Ⅰ与所述的回热风机Ⅰ进口连接，回热风机Ⅰ出口与链箅机抽风干燥段上罩连接；The described chain grate return hot air system includes the chain grate return hot air main pipe, the return heat air dust collector I, the return heat air connection pipe I and the return heat fan I, and the third group of bellows III is returned to the chain grate machine. The hot air main pipe is connected through the flue gas branch pipe I, the inlet of the return hot air dust collector I is connected with the return hot air main pipe of the chain grate machine, and the outlet of the return hot air dust collector I is connected with the return hot air fan I through the return hot air connection pipe I The inlet is connected, and the outlet of the regenerative fan I is connected with the upper cover of the drying section of the chain grate machine;
所述的环冷机回热风系统包括环冷机回热风总管、回热风除尘器Ⅱ、回热风机Ⅱ、回热风连接管道Ⅱ和冷却风机Ⅰ，所述的链箅机对应预热一段的风箱Ⅱ和风箱Ⅲ以及对应预热二段后部的风箱Ⅲ与所述的环冷机回热风总管通过烟气支管Ⅱ连接，所述的回热风除尘器Ⅱ进口与环冷机回热风总管连接，回热风除尘器Ⅱ出口与所述的回热风机Ⅱ进口连接，回热风机Ⅱ出口通过回热风连接管道Ⅱ与所述的冷却风机Ⅰ进口连接，冷却风机Ⅰ出口与环冷机一冷段风箱连接；The heat return air system of the ring cooler includes the heat return air main pipe of the ring cooler, the dust collector II of the heat return air, the heat return fan II, the connecting pipe II of the heat return air and the cooling fan I, and the chain grate corresponds to the bellows of the preheating section. II and bellows III and the corresponding bellows III at the rear of the second preheating stage are connected with the said ring cooler return hot air main pipe through the flue gas branch pipe II, the said return hot air dust collector II inlet is connected with the ring cooler return hot air main pipe, The outlet of the return air dust collector II is connected to the inlet of the described heat return fan II, the outlet of the return heat fan II is connected to the inlet of the described cooling fan I through the return heat air connection pipe II, and the outlet of the cooling fan I is connected to the air box of the first cooling section of the ring cooler. connect;
所述的烟气外排处理系统包括外排烟气总管、主电除尘器、外排烟气连接管道、主抽风机和烟气净化装置，所述的对应抽风干燥段和预热一段前半段的第二组风箱Ⅱ通过烟气支管Ⅲ与所述的外排烟气总管连接，外排烟气总管与所述的主电除尘器进口连接，主电除尘器出口通过外排烟气连接管道与所述的主抽风机进口连接，主抽风机出口与所述的烟气净化装置进口连接，烟气净化装置出口的烟气外排；The flue gas exhaust treatment system includes an external exhaust flue gas main pipe, a main electrostatic precipitator, an external exhaust flue gas connection pipe, a main exhaust fan and a flue gas purification device, and the corresponding exhaust drying section and the first half section of the preheating section. The second group of bellows II is connected to the external exhaust flue gas main pipe through the flue gas branch pipe III, the external exhaust flue gas main pipe is connected to the main electrostatic precipitator inlet, and the main electrostatic precipitator outlet is connected to the external exhaust flue gas pipe is connected with the inlet of the main exhaust fan, the outlet of the main exhaust fan is connected with the inlet of the flue gas purification device, and the flue gas at the outlet of the flue gas purification device is discharged out;
在连接链箅机预热一段后段的风箱Ⅲ和预热二段后段的风箱Ⅲ的烟气支管Ⅰ上设置调节阀Ⅰ，在回热风除尘器Ⅰ出口与回热风机Ⅰ进口之间的回热风连接管道Ⅰ上设有兑风阀Ⅰ。A regulating valve I is installed on the flue gas branch pipe I connecting the bellows III in the rear section of the preheating stage of the chain grate machine and the bellows III in the rear section of the second preheating section. The return air connection pipe I is provided with an air exchange valve I.
在连接链箅机预热一段的风箱Ⅱ和风箱Ⅲ以及预热二段后部的风箱Ⅲ的烟气支管Ⅱ上设置调节阀Ⅰ，在回热风机Ⅱ出口与冷却风机Ⅰ进口之间的回热风连接管道Ⅱ上设置调节阀Ⅱ和兑风阀Ⅱ。A regulating valve I is set on the flue gas branch pipe II connecting the bellows II and III of the preheating stage of the chain grate machine and the bellows III at the rear of the second preheating stage. A regulating valve II and an air mixing valve II are set on the hot air connection pipeline II.
在连接链箅机预热一段前段的风箱Ⅱ的烟气支管Ⅲ上设置调节阀Ⅰ，在主电除尘器出口与主抽风机进口之间的外排烟气连接管道上设置兑风阀Ⅱ。A regulating valve I is set on the flue gas branch pipe III of the bellows II connected to the first stage of the preheating stage of the chain grate machine, and an air exchange valve II is set on the external exhaust flue gas connecting pipe between the outlet of the main electrostatic precipitator and the inlet of the main exhaust fan.
与现有技术相比，本发明的优点：Compared with the prior art, the advantages of the present invention:
（1）本发明的链箅机抽风干燥段和预热段烟气回收利用及排放系统，通过调节烟气支管上调节阀Ⅰ的开度，可以改变烟气流向和高低温烟气的分配比例，达到调节混合烟气温度的目的，可根据生产需要便捷地控制去往抽风干燥段上罩的“回热风”温度，为球团生产过程精确控制创造了条件；(1) The flue gas recycling and discharging system in the exhaust drying section and the preheating section of the chain grate machine of the present invention can change the flue gas flow direction and the distribution ratio of high and low temperature flue gas by adjusting the opening of the regulating valve I on the flue gas branch pipe. , to achieve the purpose of adjusting the temperature of the mixed flue gas, and the temperature of the "returning hot air" to the upper cover of the exhaust drying section can be conveniently controlled according to production needs, creating conditions for the precise control of the pellet production process;
（2）本发明的链箅机抽风干燥段和预热段烟气回收利用及排放系统，利用一部分热烟气作为冷却介质，避免了热球团矿被急冷，也提高了一冷段冷却废气的温度，可为回转窑内提供更多热量，节省回转窑主燃烧器的燃料消耗，为球团生产过程节能创造了条件；(2) The flue gas recycling and discharging system in the exhaust drying section and the preheating section of the chain grate machine of the present invention uses a part of the hot flue gas as the cooling medium, which avoids the rapid cooling of the hot pellets, and also improves the cooling waste gas in the cooling section. The high temperature can provide more heat in the rotary kiln, save the fuel consumption of the main burner of the rotary kiln, and create conditions for energy saving in the pellet production process;
（3）本发明的链箅机抽风干燥段和预热段烟气回收利用及排放系统，通过回热风机Ⅰ将预热一段后部风箱的烟气送往链箅机上罩使用，通过回热风机Ⅱ将预热一段前部风箱的烟气送往环冷机作为冷却风，避免了预热一段风箱烟气全部外排，可大幅降低主电除尘器、主抽风机、烟气净化装置的处理量，为球团生产过程减排创造了条件。(3) The flue gas recovery, utilization and discharge system of the exhaust drying section and the preheating section of the chain grate machine of the present invention sends the flue gas from the bellows at the rear of the preheating section to the upper cover of the chain grate machine through the regenerative fan I for use. Fan II sends the flue gas from the front bellows of the preheating section to the ring cooler as cooling air, which avoids the exhaust of all the flue gas from the bellows in the preheating section, which can greatly reduce the damage of the main electrostatic precipitator, the main exhaust fan and the flue gas purification device. The processing capacity creates conditions for emission reduction in the pellet production process.
附图说明Description of drawings
图1为本发明的工艺流程图。Fig. 1 is a process flow diagram of the present invention.
图2为图1的A局部放大图。FIG. 2 is an enlarged view of part A of FIG. 1 .
具体实施方式Detailed ways
下面结合附图和实施例对本发明作进一步说明。The present invention will be further described below with reference to the accompanying drawings and embodiments.
如图1和图2所示，本发明的一种链箅机抽风干燥段和预热段烟气回收利用及排放系统，包括链箅机1、链箅机上罩及链箅机风箱，环冷机2、环冷机上罩及环冷机风箱，链箅机回热风系统，环冷机回热风系统和烟气外排处理系统；所述的链箅机上罩沿链箅机1运动方向依次分为鼓风干燥段26、抽风干燥段27、预热一段28和预热二段29，所述的环冷机上罩沿环冷机2运动方向依次分为一冷段、二冷段和三冷段，其特征在于：所述的链箅机风箱分为三组，第一组风箱Ⅰ对应鼓风干燥段，第二组风箱Ⅱ30对应抽风干燥段27和预热一段28前半段，第三组风箱Ⅲ31对应预热一段28后半段和预热二段29；第二组风箱Ⅱ30和第三组风箱Ⅲ31分别通过各自的烟气支管连接链箅机回热风系统、环冷机回热风系统和烟气外排处理系统；As shown in Figures 1 and 2, a system for recycling and discharging flue gas in the exhaust drying section and the preheating section of a chain grate of the present invention includes a chain grate 1, a chain grate upper cover and a chain grate bellows, an annular cooling system. 2. The upper cover of the ring cooler and the bellows of the ring cooler, the hot air return system of the chain grate, the hot air return system of the ring cooler and the exhaust gas treatment system; For the blast drying section 26, the exhaust drying section 27, the first section 28 for preheating and the second section 29 for preheating, the ring cooler upper cover is divided into a cooling section, a second cooling section and a third cooling section along the movement direction of the ring cooler 2. It is characterized in that: the chain grate bellows are divided into three groups, the first group of bellows I corresponds to the blast drying section, the second group of bellows II30 corresponds to the exhaust drying section 27 and the first half of the preheating section 28, and the third group The bellows III31 corresponds to the second half of the preheating first stage 28 and the second preheating stage 29; the second group of bellows II30 and the third group of bellows III31 are respectively connected to the chain grate return hot air system, the ring cooler return hot air system and the Flue gas effluent treatment system;
所述的链箅机回热风系统包括链箅机回热风总管3、回热风除尘器Ⅰ4、回热风连接管道Ⅰ5和回热风机Ⅰ6，所述的第三组风箱Ⅲ31与所述的链箅机回热风总管3通过烟气支管Ⅰ17连接，所述的回热风除尘器Ⅰ4进口与所述的链箅机回热风总管3连接，回热风除尘器Ⅰ4出口通过回热风连接管道Ⅰ5与所述的回热风机Ⅰ6进口连接，回热风机Ⅰ6出口与链箅机抽风干燥段上罩连接；在连接链箅机1预热一段28后段和预热二段29后段的风箱Ⅲ31的烟气支管Ⅰ17上设置调节阀Ⅰ20，在回热风除尘器Ⅰ4出口与回热风机Ⅰ6进口之间的回热风连接管道Ⅰ5上设有兑风阀Ⅰ22。The described chain grate return hot air system includes the chain grate return hot air main pipe 3, the return heat air dust collector I4, the return heat air connection pipe I5 and the return heat fan I6, the third group of bellows III31 and the chain grate machine. The return hot air main pipe 3 is connected through the flue gas branch pipe I17, the inlet of the return hot air dust collector I4 is connected with the return hot air main pipe 3 of the chain grate machine, and the outlet of the return hot air dust collector I4 is connected to the return hot air through the return hot air connection pipe I5. The inlet of the hot air blower I6 is connected, and the outlet of the regenerative blower I6 is connected to the upper cover of the exhaust and drying section of the chain grate machine; the flue gas branch pipe I17 of the bellows III31 is connected to the rear section of the preheating section 28 of the chain grate machine 1 and the rear section of the second preheating section 29. A regulating valve I20 is set on the upper part, and an air mixing valve I22 is provided on the return hot air connecting pipe I5 between the outlet of the return hot air dust collector I4 and the inlet of the return heat fan I6.
所述的环冷机回热风系统包括环冷机回热风总管7、回热风除尘器Ⅱ8、回热风机Ⅱ9、回热风连接管道Ⅱ10和冷却风机Ⅰ11，所述的链箅机1对应预热一段28的风箱Ⅱ30和风箱Ⅲ31以及对应预热二段29后段的风箱Ⅲ31与所述的环冷机回热风总管7通过烟气支管Ⅱ18连接，所述的回热风除尘器Ⅱ8进口与环冷机回热风总管7连接，回热风除尘器Ⅱ8出口与所述的回热风机Ⅱ9进口连接，回热风机Ⅱ9出口通过回热风连接管道Ⅱ10与所述的冷却风机Ⅰ11进口连接，冷却风机Ⅰ11出口与环冷机一冷段风箱25连接；在连接链箅机预热一段28的风箱Ⅱ30和风箱Ⅲ31以及预热二段29后段的风箱Ⅲ31的烟气支管Ⅱ18上设置调节阀Ⅰ20，在回热风机Ⅱ9出口与冷却风机Ⅰ11进口之间的回热风连接管道Ⅱ10上设置调节阀Ⅱ21和兑风阀Ⅱ24。The heat return air system of the ring cooler includes the heat return air main pipe 7 of the ring cooler, the dust collector II8 of the heat return air, the heat return fan II9, the connecting pipe II10 of the return heat air and the cooling fan I11. The chain grate machine 1 corresponds to a preheating section. The bellows II30 and III31 of 28 and the bellows III31 corresponding to the rear section of the second preheating section 29 are connected with the said ring cooler return hot air main pipe 7 through the flue gas branch pipe II18, and the said return hot air dust collector II8 The inlet is connected to the ring cooler. The return hot air main pipe 7 is connected, the outlet of the return hot air dust collector II8 is connected with the inlet of the described heat return fan II9, the outlet of the return heat fan II9 is connected with the inlet of the described cooling fan I11 through the return hot air connecting pipe II10, and the outlet of the cooling fan I11 is connected with the ring. The bellows 25 of the first cold section of the cold machine are connected; the regulating valve I20 is set on the flue gas branch pipe II18 of the bellows II30 and III31 of the first section 28 of the chain grate preheating and the second section of the bellows III31 of the second preheating section 29. Adjustment valve II21 and air exchange valve II24 are set on the return hot air connection pipeline II10 between the outlet of II9 and the inlet of cooling fan I11.
所述的烟气外排处理系统包括外排烟气总管12、主电除尘器13、外排烟气连接管道14、主抽风机15和烟气净化装置16，所述的对应抽风干燥段27和预热一段28前半段的第二组风箱Ⅱ30通过烟气支管Ⅲ19与所述的外排烟气总管12连接，外排烟气总管12与所述的主电除尘器13进口连接，主电除尘器13出口通过外排烟气连接管道14与所述的主抽风机15进口连接，主抽风机15出口与所述的烟气净化装置16进口连接，烟气净化装置16出口的烟气外排；在连接链箅机预热一段28前段的风箱Ⅱ30的烟气支管Ⅲ19上设置调节阀Ⅰ20，在主电除尘器13出口与主抽风机15进口之间的外排烟气连接管道14上设置兑风阀Ⅱ23。The flue gas exhaust treatment system includes an external exhaust flue gas main pipe 12, a main electrostatic precipitator 13, an external exhaust flue gas connecting pipe 14, a main exhaust fan 15 and a flue gas purification device 16, and the corresponding exhaust air drying section 27. The second group of bellows II30 in the first half of the preheating section 28 is connected to the external exhaust flue gas main pipe 12 through the flue gas branch pipe III19, and the external exhaust flue gas main pipe 12 is connected to the inlet of the main electrostatic precipitator 13. The outlet of the dust collector 13 is connected to the inlet of the main exhaust fan 15 through the external exhaust gas connection pipe 14, and the outlet of the main exhaust fan 15 is connected to the inlet of the exhaust gas purification device 16. Set the regulating valve I20 on the flue gas branch pipe III19 of the bellows II30 connected to the preheating section 28 of the chain grate machine, and on the external exhaust flue gas connection pipe 14 between the outlet of the main electrostatic precipitator 13 and the inlet of the main exhaust fan 15 Set the air valve II23.
工作过程work process
本发明工作过程如下：The working process of the present invention is as follows:
（1）链箅机回热风系统(1) Chain grate machine return hot air system
链箅机1预热一段28后半段的部分烟气与预热二段29大部分风箱Ⅲ31的烟气通过烟气支管Ⅰ17进入链箅机回热风总管3汇合，经由回热风除尘器Ⅰ4、回热风机Ⅰ6去往链箅机1抽风干燥段27上罩作为加温介质使用。Part of the flue gas in the second half of the preheating stage 28 of the chain grate machine 1 and the flue gas of most of the bellows III31 in the preheating stage 29 enter the chain grate machine return hot air main pipe 3 through the flue gas branch pipe I17, and pass through the return hot air dust collector I4, The regenerative fan I6 goes to the upper cover of the exhaust drying section 27 of the chain grate machine 1 and is used as a heating medium.
（2）烟气外排处理系统(2) Flue gas efflux treatment system
链箅机1抽风干燥段27的风箱Ⅱ30的烟气与预热一段28前半段风箱Ⅱ30的部分烟气通过烟气支管Ⅲ19进入外排烟气总管12汇合，经由主电除尘器13、主抽风机15、烟气净化装置16作为废气排放。The flue gas from the bellows II 30 in the air extraction and drying section 27 of the chain grate machine 1 and the part of the flue gas from the bellows II 30 in the first half of the preheating section 28 enter the external exhaust flue gas main pipe 12 through the flue gas branch pipe III 19 to join, and pass through the main electrostatic precipitator 13 and the main exhaust gas. The machine 15 and the flue gas purification device 16 are discharged as exhaust gas.
（3）环冷机回热风系统(3) Circular cooler return hot air system
剩余的链箅机1预热一段28和预热二段29的烟气通过风箱Ⅱ30和风箱Ⅲ31的烟气支管Ⅱ18混合，经由回热风除尘器Ⅱ8、回热风机Ⅱ9、冷却风机Ⅰ11去往环冷机2一冷段风箱25作为冷却风使用。The flue gas of the remaining chain grate 1 preheating first stage 28 and preheating second stage 29 is mixed through the bellows II30 and the flue gas branch pipe II18 of the bellows III31, and goes to the ring through the return hot air dust collector II8, the return heat fan II9, and the cooling fan I11. The air box 25 of the cooling machine 2 and the cooling section is used as cooling air.
上述链箅机回热风系统，环冷机回热风系统和烟气外排处理系统，根据生产需要，通过合理调节烟气支管Ⅰ17、烟气支管Ⅱ18和烟气支管Ⅲ19上的调节阀Ⅰ20的开度，可以确定链箅机1预热一段28及预热二段29风箱烟气的走向，切换烟气流向和调节高低温烟气的分配比例，达到控制混合烟气温度的目的，从而控制回热风机Ⅰ6出口烟气的温度，使回热风温度可根据生产需要调节，为球团生产过程的精确控制创造条件。The above-mentioned chain grate machine return hot air system, ring cooler return hot air system and flue gas effluent treatment system, according to production needs, through reasonable adjustment of the opening of the regulating valve I20 on the flue gas branch pipe I17, the flue gas branch pipe II18 and the flue gas branch pipe III19. It can determine the direction of the flue gas in the bellows of the preheating stage 28 and the preheating stage 29 of the chain grate machine 1, switch the flow direction of the flue gas and adjust the distribution ratio of the high and low temperature flue gas, so as to achieve the purpose of controlling the temperature of the mixed flue gas, thereby controlling the return flow. The temperature of the flue gas at the outlet of the hot air blower I6 enables the temperature of the return hot air to be adjusted according to the production needs, creating conditions for the precise control of the pellet production process.
本发明利用一部分链箅机1预热段热烟气作为环冷机2的冷却介质回收利用，避免了进入环冷机2的热球团矿被急冷，可提高环冷机2一冷段冷却废气的温度，为回转窑内提供更多热量，节省回转窑主燃烧器的燃料消耗，既能充分利用烟气余热，又可降低系统外排的烟气量，对球团生产节能减排具有现实意义。The present invention utilizes a part of the hot flue gas in the preheating section of the chain grate machine 1 to be recycled as the cooling medium of the ring cooler 2, so that the hot pellets entering the ring cooler 2 are prevented from being quenched, and the cooling of the first cooling section of the ring cooler 2 can be improved. The temperature of the exhaust gas provides more heat for the rotary kiln and saves the fuel consumption of the main burner of the rotary kiln. It can not only make full use of the waste heat of the flue gas, but also reduce the amount of flue gas discharged from the system. realistic meaning.
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