CN101274813B - Sludge drying system for exhaust waste heat recovery and reuse - Google Patents
Sludge drying system for exhaust waste heat recovery and reuse Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 215
- 238000001035 drying Methods 0.000 title claims abstract description 87
- 239000002918 waste heat Substances 0.000 title claims abstract description 23
- 238000011084 recovery Methods 0.000 title claims description 10
- 239000007789 gas Substances 0.000 claims abstract description 44
- 238000009423 ventilation Methods 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 239000002689 soil Substances 0.000 claims abstract description 15
- 238000007872 degassing Methods 0.000 claims description 11
- 239000010865 sewage Substances 0.000 claims description 9
- 238000003306 harvesting Methods 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 9
- 239000000428 dust Substances 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 239000011449 brick Substances 0.000 abstract description 3
- 239000004568 cement Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010304 firing Methods 0.000 abstract description 2
- 238000005469 granulation Methods 0.000 abstract 1
- 230000003179 granulation Effects 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
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- 230000007812 deficiency Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000010169 landfilling Methods 0.000 description 1
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- 231100000719 pollutant Toxicity 0.000 description 1
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- 239000002699 waste material Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
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Abstract
本发明公开了一种尾气余热回收再利用的污泥干化系统。该系统有一段式和两段式不同的方式，它们由封闭式污泥预处理库、供热炉、混风器、污泥进料机、污泥干化成粒装置、热管换热器、输送设备、通风管道、污泥成品库、除尘除气设备、生物土壤滤床和烟囱等主体设备构成。该发明通过热管换热器回收污泥干化尾气余热，并将回收的能量再利用于污泥干化，不仅能够以最低的能耗高效率地完成污泥干化和成粒过程，而且能够大大地提高尾气处理的效果，真正使污泥干化实现节能、清洁和低成本地运行。该系统使污泥在干化同时所形成的团粒，即符合烧制轻质节能砖和生产水泥压制品的要求，又保持了原始污泥90％以上的热值，使污泥资源化利用的价值达到最大化。
The invention discloses a sludge drying system for recovering and reusing tail gas waste heat. The system has different modes of one-stage and two-stage, which are composed of closed sludge pretreatment storehouse, heating furnace, air mixer, sludge feeder, sludge drying and granulating device, heat pipe heat exchanger, conveying The main equipment consists of equipment, ventilation pipes, sludge product warehouse, dust removal and gas removal equipment, biological soil filter bed and chimney. The invention recovers the waste heat of sludge drying tail gas through the heat pipe heat exchanger, and reuses the recovered energy for sludge drying, which not only can complete the sludge drying and granulation process with the lowest energy consumption and high efficiency, but also can The effect of tail gas treatment is greatly improved, and the sludge is truly dried to realize energy-saving, clean and low-cost operation. The system makes the aggregates formed while the sludge is drying, which meets the requirements of firing light energy-saving bricks and producing cement pressed products, and maintains more than 90% of the calorific value of the original sludge, making the utilization of sludge resources more efficient. value is maximized.
Description
技术领域technical field
本发明涉及一种尾气余热回收再利用的污泥干化系统。The invention relates to a sludge drying system for recovering and reusing tail gas waste heat.
背景技术Background technique
城市污水处理厂在处理工业废水和生活污水同时产生的污泥，以及污染河流和湖泊的疏浚污泥除了以矿物形式存在的无机组分外，还含有大量的难降解有机污染物和多种重金属元素，这两类污泥通常被称为城市污泥。由于城市污泥具有含水率高，数量大，且富集了高浓度污染物的特点，因此，如果这类污泥得不到妥善地处理或处置，会给环境带来严重的二次污染。如何安全、经济、有效地处理城市污泥成为国内外共同面临的难题。The sludge produced by urban sewage treatment plants while treating industrial wastewater and domestic sewage, as well as the dredged sludge that pollutes rivers and lakes, in addition to inorganic components in the form of minerals, also contains a large amount of refractory organic pollutants and various heavy metals elements, these two types of sludge are often referred to as municipal sludge. Because municipal sludge has the characteristics of high water content, large quantity, and enrichment of high-concentration pollutants, if this kind of sludge is not properly treated or disposed of, it will bring serious secondary pollution to the environment. How to deal with municipal sludge safely, economically and effectively has become a common problem at home and abroad.
国外对城市污泥主要采取卫生填埋、焚烧、土地利用和投海等方法。卫生填埋需要足够的空间和必要的环境保护手段，随着城市化进程的不断加快，城市周围难以找到适合堆埋污泥的空间；焚烧虽然可以使污泥能够明显的减量化，但污泥焚烧设备投资额高，能源消耗量大，运行费用昂贵，加上污泥在焚烧时会给大气环境带来污染，根据我国的现状，污泥焚烧处理在经济上难以承受，在技术上还不够成熟；土地利用就是将污泥作为肥料，用于农业或绿化，但是，城市污泥中所含的重金属和持久性有机污染物限制了污泥作为肥料的可利用性，根据研究表明，城市污泥中富集的重金属会在土壤中富集，并通过作物的吸收进入食物链，最终危害人体健康；污泥投海会污染近海水域，对海洋生态系统和人类食物链造成威胁，这种方法已被明令禁止。由于国外没有有效的污泥处理技术可以被借鉴，因此，目前我国对城市污泥主要采用临时堆埋的方法，由此而产生的环境二次污染和大量占用土地等问题日趋尖锐，这不仅严重影响了城市污水处理的正常运行，而且在局部地区，因污泥堆埋场周边居民的强烈反对而成为社会不稳定的因素。Foreign countries mainly adopt sanitary landfill, incineration, land utilization and sea throwing methods for municipal sludge. Sanitary landfill requires sufficient space and necessary environmental protection means. With the continuous acceleration of urbanization, it is difficult to find a space suitable for landfilling sludge around the city; although incineration can significantly reduce sludge, the amount of sludge The investment of sludge incineration equipment is high, the energy consumption is large, and the operation cost is expensive. In addition, the sludge incineration will pollute the atmospheric environment. According to the current situation in our country, the sludge incineration treatment is economically unbearable and technically unaffordable. Not mature enough; land use is to use sludge as fertilizer for agriculture or greening, however, heavy metals and persistent organic pollutants contained in municipal sludge limit the availability of sludge as fertilizer. According to research, urban The heavy metals enriched in sludge will accumulate in the soil and enter the food chain through the absorption of crops, which will eventually endanger human health; sludge dumped into the sea will pollute offshore waters and pose a threat to marine ecosystems and human food chains. is expressly prohibited. Since there is no effective sludge treatment technology in foreign countries that can be used for reference, at present, my country mainly adopts the method of temporary dumping of urban sludge, and the resulting environmental secondary pollution and a large amount of land occupation are becoming increasingly acute, which is not only serious It has affected the normal operation of urban sewage treatment, and in some areas, it has become a factor of social instability due to the strong opposition of residents around the sludge landfill.
随着我国经济的快速发展和人民生活水平的不断提高，人们对环境质量的要求越来越高，为了保护生态环境和提高人类生存环境的质量，各地政府不断加强对环境保护的力度，要求所有工业废水和城市生活污水必须经过处理，达标后才能排放，同时为了有效地治理和改善污染河流和湖泊水体的环境质量，几乎所有靠近城市的河段和湖泊需要疏浚，这意味着城市污泥的数量将与日俱增。实践表明，对污泥进行无害化、减量化和资源化处理是彻底处置城市污泥的唯一途径。With the rapid development of our country's economy and the continuous improvement of people's living standards, people's requirements for environmental quality are getting higher and higher. In order to protect the ecological environment and improve the quality of human living environment, local governments continue to strengthen environmental protection. Industrial wastewater and urban domestic sewage must be treated and discharged only after reaching the standard. At the same time, in order to effectively control and improve the environmental quality of polluted rivers and lakes, almost all rivers and lakes close to cities need to be dredged, which means that the amount of urban sludge The number will increase day by day. Practice has shown that harmless, reduction and resource treatment of sludge is the only way to completely dispose of municipal sludge.
污水处理厂污泥和河湖疏浚污泥含水率高和体积大，而热干化不仅可以使污泥显著地减少体积，并且能够明显地减少臭味、病原菌、粘度等负面特性，干化后的污泥更是具有多方面的用途，因此，热干化是污泥实现减量化、无害化和资源化处理的关键一步。我们曾经在对城市污水处理厂产生的污泥和污染河、湖疏浚污泥物化性质研究的基础上，通过大量的工程实践，相继发明了回流式可控温污泥干化装置与方法(发明专利授权号：200410052759.0)和利用锅炉烟气余热干化污泥的方法(专利号：ZL 2005 1 0048978.6)，这使得污泥在得到有效干化的同时，形成质地坚硬的污泥团粒，并保存了90％以上的原始热值，这种污泥团粒也可以作为燃煤的辅助燃料，也可以烧制轻质节能砖和生产水泥压制品等，为城市污泥的无害化资源化处理奠定了基础，它们的技术核心是，在城市污泥资源化利用之前，通过热干化过程，先将污泥减量化，并制成污泥团粒。污泥热干化的过程，是能量净支出的过程，耗能的费用占到了整个运行成本的80％左右，现有的污泥热干化方法，是通过供热源将热空气送入干燥装置中，把热量传给污泥物料，使污泥中的水分汽化而得到干化，在这个过程中有一部分的热能以烟气的显热和烟气中水蒸汽的潜热排入大气，造成了能源的浪费。为了减少污泥干化的能耗，降低污泥热干化的运行成本，我们发明了尾气余热回收再利用的污泥干化系统，采用热交换技术，通过热管换热器回收污泥干化时排放尾气中的余热，再将该热能回用于污泥的干化过程，这一方面使能量的利用率得到大幅度提高，另一方面使污泥干化所产生的尾气的处理效率也得到进一步的提高。另外，由于整个污泥干化过程采用全封闭运行，因此，不仅使污泥得到干化和成粒后，仍保持污泥原有的90％以上的热值，而且使污泥干化正真实现了清洁节能。Sewage treatment plant sludge and river and lake dredging sludge have high moisture content and large volume, and thermal drying can not only significantly reduce the volume of sludge, but also significantly reduce negative characteristics such as odor, pathogenic bacteria, and viscosity. The sludge has many uses. Therefore, thermal drying is a key step in realizing the reduction, harmless and resourceful treatment of sludge. Based on the research on the physical and chemical properties of sludge produced by urban sewage treatment plants and dredged sludge from polluted rivers and lakes, and through a large number of engineering practices, we have successively invented return-type temperature-controllable sludge drying devices and methods (invention Patent authorization number: 200410052759.0) and the method of drying sludge by using the waste heat of boiler flue gas (patent number: ZL 2005 1 0048978.6), which makes the sludge form hard sludge aggregates while being effectively dried and preserved More than 90% of the original calorific value is lost. This kind of sludge pellets can also be used as an auxiliary fuel for burning coal, and can also be used to burn light energy-saving bricks and produce cement pressed products, etc., laying a solid foundation for the harmless and resourceful treatment of urban sludge. The core of their technology is to reduce the amount of sludge and make it into sludge pellets through the thermal drying process before the urban sludge is used as a resource. The process of thermal sludge drying is a process of net energy expenditure. Energy consumption accounts for about 80% of the entire operating cost. The existing sludge thermal drying method is to send hot air into the drying process through a heat source. In the device, the heat is transferred to the sludge material, so that the water in the sludge is vaporized and dried. In this process, part of the heat energy is discharged into the atmosphere with the sensible heat of the flue gas and the latent heat of water vapor in the flue gas, resulting in waste of energy. In order to reduce the energy consumption of sludge drying and reduce the operating cost of thermal sludge drying, we have invented a sludge drying system that recovers and reuses waste heat from tail gas, adopts heat exchange technology, and recovers sludge drying through heat pipe heat exchangers Discharge the waste heat in the tail gas, and then recycle the heat energy into the sludge drying process. On the one hand, the energy utilization rate is greatly improved, and on the other hand, the treatment efficiency of the tail gas generated by the sludge drying is also improved. be further improved. In addition, since the entire sludge drying process adopts a fully enclosed operation, not only the sludge is dried and granulated, but still maintains more than 90% of the original calorific value of the sludge, and the sludge drying is truly Realized clean energy saving.
发明内容Contents of the invention
本发明的目的是克服现有技术的不足，提供一种尾气余热回收再利用的污泥干化系统。The purpose of the present invention is to overcome the deficiencies of the prior art and provide a sludge drying system for recovering and reusing tail gas waste heat.
一种尾气余热回收再利用的污泥干化系统具有污泥预处理库，污泥储存库内设有推泥机，污泥储存库一端通过槽式螺旋输送机与污泥进料机相连接，污泥进料机依次通过污泥进料口和第一输送机与第一污泥干化成粒装置的进料口相连接，供热炉通过混风器经通风管与第一污泥干化成粒装置的进气口相连接，第一污泥干化成粒装置的出气口经通风管与热管换热器的热气体进口相连接，热管换热器的第一预热空气出口通过第一风机与混风器相连接，热管换热器的第二预热空气出口通过第三风机与污泥成品库的预热空气进口相连接，污泥成品库的出气口通过第五风机与生物土壤滤床相连接，污泥储存库的气体释放口通过第四风机和与生物土壤滤床相连接，或者污泥储存库的气体释放口通过第三风机与供热炉相连接，热管换热器的排气口经通风管与除尘除气设备相连接，除尘除气设备通过第二风机与烟囱相连接，污泥干化成粒装置的出料口通过第二输送机与污泥成品库的进料口相连接。污泥预处理库顶部设有采阳板。A sludge drying system for recovery and reuse of tail gas waste heat has a sludge pretreatment warehouse, a sludge pusher is installed in the sludge storage warehouse, and one end of the sludge storage warehouse is connected to the sludge feeder through a trough screw conveyor , the sludge feeding machine is connected to the feeding port of the first sludge drying and granulating device through the sludge feeding port and the first conveyor in turn, and the heating furnace is connected to the first sludge drying and granulating device through the air mixer through the ventilation pipe. The air inlet of the first sludge drying and granulating device is connected, the air outlet of the first sludge drying and granulating device is connected with the hot gas inlet of the heat pipe heat exchanger through the ventilation pipe, and the first preheated air outlet of the heat pipe heat exchanger passes through the first The fan is connected with the air mixer, the second preheated air outlet of the heat pipe heat exchanger is connected with the preheated air inlet of the sludge finished product warehouse through the third fan, and the air outlet of the sludge finished product warehouse is connected with the biological soil through the fifth fan The filter bed is connected, the gas release port of the sludge storage is connected with the biological soil filter bed through the fourth fan, or the gas release port of the sludge storage is connected with the heating furnace through the third fan, and the heat pipe heat exchanger The exhaust port of the exhaust port is connected to the dedusting and degassing equipment through the ventilation pipe, the dedusting and degassing equipment is connected to the chimney through the second fan, and the outlet of the sludge drying and granulating device is connected to the inlet of the sludge finished product warehouse through the second conveyor The feed port is connected. The top of the sludge pretreatment tank is equipped with a sun collection plate.
另一种尾气余热回收再利用的污泥干化系统具有污泥预处理库，污泥预处理库内设有推泥机，污泥预处理库通过槽式螺旋输送机与污泥进料机相连接，污泥进料机依次通过第一污泥进料口和第一输送机与第一污泥干化成粒装置的进料口相连接，第一污泥干化成粒装置的出料口通过第三输送机与第二进料口相连接，供热炉通过混风器经通风管同时与第一污泥干化成粒装置的进气口、第二污泥干化成粒装置的进气口相连接，第一污泥干化成粒装置的出气口、第二污泥干化成粒装置的出气口同时经通风管和第七风机与热管换热器的热气体进口相连接，热管换热器的第一预热空气出口通过第一风机经通风管与混风器相连接，热管换热器的第二预热空气出口通过第六风机与污泥成品库的预热空气进口相连接，污泥成品库的出气口通过第五风机与生物土壤滤床相连接，污泥预处理库的气体释放口通过第四风机与生物土壤滤床相连接，或者通过第三风机与供热炉相连接，热管换热器的排气口经通风管与除尘除气设备相连接，除尘除气设备通过第二风机与烟囱相连接，第二污泥干化成粒装置的出料口通过第二输送机与污泥成品库的进料口相连接。污泥预处理库顶部设有采阳板。Another sludge drying system for waste heat recovery and reuse of exhaust gas has a sludge pretreatment warehouse, and a sludge pusher is installed in the sludge pretreatment warehouse. The sludge pretreatment warehouse passes through a trough screw conveyor and a sludge feeder. The sludge feeder is connected to the feed port of the first sludge drying and granulating device through the first sludge feeding port and the first conveyor in turn, and the discharge port of the first sludge drying and granulating device The third conveyor is connected to the second feed port, and the heating furnace is connected to the air inlet of the first sludge drying and granulating device and the air inlet of the second sludge drying and granulating device through the air mixer through the ventilation pipe. The air outlet of the first sludge drying and granulating device and the air outlet of the second sludge drying and granulating device are connected to the hot gas inlet of the heat pipe heat exchanger through the ventilation pipe and the seventh fan, and the heat pipe heat exchange The first preheated air outlet of the device is connected to the air mixer through the first fan through the ventilation pipe, and the second preheated air outlet of the heat pipe heat exchanger is connected to the preheated air inlet of the sludge finished product warehouse through the sixth fan. The air outlet of the sludge finished product warehouse is connected with the biological soil filter bed through the fifth fan, and the gas release port of the sludge pretreatment warehouse is connected with the biological soil filter bed through the fourth fan, or connected with the heating furnace through the third fan. Connection, the exhaust port of the heat pipe heat exchanger is connected to the dust removal and gas removal equipment through the ventilation pipe, the dust removal and gas removal equipment is connected to the chimney through the second fan, and the outlet of the second sludge drying and granulating device is passed through the second conveying The machine is connected with the feed inlet of the finished sludge storage. The top of the sludge pretreatment tank is equipped with a sun collection plate.
本发明通过尾气余热回收再利用，不仅使提供干化污泥的能量得到充分地利用，而且使污泥干化排放的尾气温度下降，从而大大提高了除尘除气的效果，这一方面使污泥干化在较低的运行成本下进行，另一方面使污泥在得到有效干化的同时，使污泥自然形成符合烧制轻质节能砖和生产水泥压制品硬度要求的团粒，并保持了污泥原有的90％以上的热值，为污泥团粒的资源化利用价值达到最大化创造了条件，真正实现了清洁节能的目标，即能获得显著的社会和环境效益，又能获得明显的经济效益。The invention recycles and reuses the waste heat of tail gas, which not only makes full use of the energy for providing dried sludge, but also lowers the temperature of tail gas discharged from sludge drying, thereby greatly improving the effect of dust removal and gas removal. Sludge drying is carried out at a lower operating cost. On the other hand, while the sludge is effectively dried, the sludge naturally forms aggregates that meet the hardness requirements for firing lightweight energy-saving bricks and producing cement pressed products, and maintains More than 90% of the original calorific value of the sludge has been created, creating conditions for the resource utilization value of the sludge aggregates to be maximized, and the goal of cleaning and energy saving has been truly realized, which can not only obtain significant social and environmental benefits, but also obtain obvious economic benefits.
附图说明Description of drawings
图1是一段式尾气余热回收再利用的污泥干化系统结构示意图；Figure 1 is a schematic diagram of the structure of a one-stage sludge drying system for waste heat recovery and reuse;
图2是并联二段式尾气余热回收再利用的污泥干化系统结构示意图；图中：供热炉1、混风器2、第一污泥干化成粒装置3、热管换热器4、除尘除气设备5、烟囱6、污泥预处理库7、推泥机8、槽式螺旋输送机9、第一输送机10、污泥成品库11、生物土壤滤床12、第一污泥进料口13、第一风机14、第二输送机15、第二风机16、第三风机17、第四风机18、第五风机19、第六风机20、污泥进料机21、第二污泥干化成粒装置22、第三输送机23、第二污泥进料口24、第七风机25。Fig. 2 is a schematic diagram of the structure of a parallel two-stage exhaust gas waste heat recovery and reuse sludge drying system; in the figure: heating furnace 1, air mixer 2, first sludge drying and granulating device 3, heat pipe heat exchanger 4, Dedusting and degassing equipment 5, chimney 6, sludge pretreatment warehouse 7, mud pusher 8, trough screw conveyor 9, first conveyor 10, sludge finished product warehouse 11, biological soil filter bed 12, first sludge Feed inlet 13, first fan 14, second conveyor 15, second fan 16, third fan 17, fourth fan 18, fifth fan 19, sixth fan 20, sludge feeder 21, second A sludge drying and granulating device 22 , a third conveyor 23 , a second
具体实施方式Detailed ways
如附图1所示，一段式尾气余热回收再利用的污泥干化系统具有污泥预处理库7，污泥储存库7内设有推泥机8，污泥储存库7通过槽式螺旋输送机9与污泥进料机21相连接，污泥进料机21依次通过污泥进料口13和第一输送机10与第一污泥干化成粒装置3的进料口相连接，供热炉1通过混风器2与第一污泥干化成粒装置3的进气口相连接，为污泥干化提供热量，第一污泥干化成粒装置3的出气口经通风管与热管换热器4的热气体进口相连接，通过热管换热器4回收来自第一污泥干化成粒装置3的尾气余热，并将回收的余热转换成热空气，热管换热器4的第一预热空气出口通过第一风机14与混风器2相连接，将一部分热空气与来自供热炉1的热量相混合，一方面起调节温度的作用，另一方面为污泥干化提供循环再利用的能源，热管换热器4的第二预热空气出口通过第三风机20与污泥成品库11的预热空气进口相连接，将另一部分热空气作为干化后污泥进一步脱水的能源，污泥成品库11的出气口通过第四风机18与生物土壤滤床12相连接，污泥储存库7的气体释放口通过第四风机18和与生物土壤滤床12相连接，或者通过第三风机17与供热炉1相连接，热管换热器4的排气口经通风管与除尘除气设备5相连接，除尘除气设备5通过第二风机16与烟囱6相连接，经过除尘除气处理后的污泥干化尾气达标排放，第一污泥干化成粒装置3的出料口通过第二输送机15与污泥成品库11的进料口相连接。封闭式污泥预处理库，其顶部设有采阳板。As shown in Figure 1, the one-stage sludge drying system for exhaust waste heat recovery and reuse has a sludge pretreatment storehouse 7, and a sludge pusher 8 is installed in the sludge storehouse 7, and the sludge storehouse 7 passes through a trough-type spiral The conveyor 9 is connected to the sludge feeding machine 21, and the sludge feeding machine 21 is connected to the feeding port of the first sludge drying and granulating device 3 through the sludge feeding port 13 and the first conveyor 10 in turn, The heating furnace 1 is connected to the air inlet of the first sludge drying and granulating device 3 through the air mixer 2 to provide heat for sludge drying, and the air outlet of the first sludge drying and granulating device 3 is connected to the air outlet through the ventilation pipe. The hot gas inlet of the heat pipe heat exchanger 4 is connected, and the waste heat of the exhaust gas from the first sludge drying and granulating device 3 is recovered through the heat pipe heat exchanger 4, and the recovered waste heat is converted into hot air. A preheated air outlet is connected with the air mixer 2 through the first blower 14, and mixes a part of the hot air with the heat from the heating furnace 1, on the one hand, it plays the role of adjusting the temperature, on the other hand, it provides sludge drying. Recycled and reused energy, the second preheated air outlet of the heat pipe heat exchanger 4 is connected to the preheated air inlet of the sludge finished product warehouse 11 through the third fan 20, and another part of hot air is used as the dried sludge for further dehydration energy, the air outlet of the sludge product warehouse 11 is connected with the biological soil filter bed 12 through the fourth fan 18, and the gas release port of the sludge storage 7 is connected with the biological soil filter bed 12 through the fourth fan 18, or The third blower fan 17 is connected with the heating furnace 1, the exhaust port of the heat pipe heat exchanger 4 is connected with the dust removal and gas removal equipment 5 through the ventilation pipe, and the dust removal and gas removal equipment 5 is connected with the chimney 6 through the second blower fan 16, After dedusting and degassing, the tail gas of sludge drying meets the standard discharge, and the discharge port of the first sludge drying and granulating device 3 is connected with the feed port of the finished sludge warehouse 11 through the second conveyor 15 . The closed sludge pretreatment warehouse has a sun collecting plate on the top.
如附图2所示，并联二段式尾气余热回收再利用的污泥干化系统具有污泥预处理库7，污泥预处理库7内设有推泥机8，污泥预处理库7通过槽式螺旋输送机9与污泥进料机21相连接，污泥进料机21依次通过第一污泥进料口13和第一输送机10与第一污泥干化成粒装置3的进料口相连接，第一污泥干化成粒装置3的出料口通过第三输送机23与第二进料口24相连接，将经过第一段干化后的污泥送入第二污泥干化成粒装置22，进行第二段干化，供热炉1通过混风器2经通风管同时与第一污泥干化成粒装置3的进气口、第二污泥干化成粒装置22的进气口相连接，为污泥第一段干化和第二段干化提供热量，第一污泥干化成粒装置3的出气口、第二污泥干化成粒装置22的出气口同时经通风管和第七风机25与热管换热器4的热气体进口相连接，通过热管换热器4回收来自第一污泥干化成粒装置3和第二污泥干化成粒装置22的尾气余热，并将回收的余热转换成热空气，热管换热器4的第一预热空气出口通过第一风机14经通风管与混风器2相连接，将一部分热空气与来自供热炉1的热量相混合，一方面起调节温度的作用，另一方面为污泥干化提供循环再利用的能源，热管换热器4的第二预热空气出口通过第六风机20与污泥成品库11的预热空气进口相连接，将另一部分热空气作为干化后污泥进一步脱水的能源，污泥成品库11的出气口通过第五风机19与生物土壤滤床12相连接，污泥预处理库7的气体释放口通过第四风机18与生物土壤滤床12相连接，或者通过第三风机17与供热炉1相连接，热管换热器4的排气口经通风管与除尘除气设备5相连接，除尘除气设备5通过第二风机16与烟囱6相连接，经过除尘除气处理后的污泥干化尾气达标排放，第二污泥干化成粒装置22的出料口通过第二输送机15与污泥成品库11的进料口相连接。封闭式污泥预处理库，其顶部设有采阳板。As shown in Figure 2, the sludge drying system for parallel two-stage tail gas waste heat recovery and reuse has a sludge pretreatment warehouse 7, and a sludge pusher 8 is installed in the sludge pretreatment warehouse 7, and a sludge pretreatment warehouse 7 The trough screw conveyor 9 is connected to the sludge feeder 21, and the sludge feeder 21 passes through the first sludge feed port 13 and the first conveyor 10 and the first sludge drying and granulating device 3 successively. The feed port is connected, and the discharge port of the first sludge drying and granulating device 3 is connected with the
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| CN101643307B (en) * | 2009-08-25 | 2011-08-31 | 浙江大学 | Method for utilizing fume afterheat of cement plant to heat-dry sludge and prepare cement by firing sludge |
| CN102809159A (en) * | 2011-06-02 | 2012-12-05 | 吴军伟 | Town domestic garbage drying and burning system |
| CN102435082B (en) * | 2011-10-28 | 2013-07-31 | 北京建筑材料科学研究总院有限公司 | Two-phase heat exchanger and system utilizing cement kiln waste heat to dry sludge |
| CN106007338A (en) * | 2016-08-11 | 2016-10-12 | 江苏金陵干燥科技有限公司 | Belt-type sludge drying device |
| CN110396417A (en) * | 2019-08-27 | 2019-11-01 | 安徽省通源环境节能股份有限公司 | A kind of desiccation charing process system and treatment process |
| CN111473341A (en) * | 2020-05-22 | 2020-07-31 | 常州英科环境科技有限公司 | Mechanical rotary sludge incineration system and working method |
| CN113465422B (en) * | 2021-06-17 | 2023-05-02 | 浙江大学 | Heat energy recovery system for sludge drying tail gas of blade dryer and use method of heat energy recovery system |
| CN113683289B (en) * | 2021-09-15 | 2024-09-13 | 东华大学 | Low-energy-consumption sludge thermal drying method |
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