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中国江苏省常州市雪堰工业区雪东路2号 address: No. 2 Xuedong Road, Xueyan Industrial Zone, Changzhou City, Jiangsu Province, China

Waste heat boiler which is good Jiangsu Runli energy saving and environmental protection

author: Jiangsu Runli Boiler Co., Ltd.

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2019-11-19 15:17:46 time: 2019-11-19 15:17:46

余热锅炉哪家好 江苏润利节能环保

With the further development of China's economy, more and more hazardous wastes have been produced in industrial production, which has caused a fatal and large-scale impact on the surrounding environment. Therefore, today's hazardous waste disposal has caused more and more attention at home and abroad. At present, the incineration treatment technology of hazardous waste has increasingly become one of the main treatment technologies in China. It has many advantages such as stable treatment effect, high efficiency, and good capacity reduction, and is widely used in developed countries. At this stage, the overall level of hazardous waste incineration technology in China is still relatively low compared with developed countries in Europe, America, and Japan. Especially in terms of incineration heat energy recycling, the means are simple and the equipment is simple, resulting in a lot of waste of resources.

吨、 10吨的小型焚烧设备,发展到现在30吨、 50吨、甚至100吨的大中规模的危险废物焚烧系统设备,热能资源浪费的情况也越来越凸显出来。 With the continuous expansion of the scale of hazardous waste incineration in China, from the original small-scale incineration equipment of 5 tons and 10 tons to the current large- and medium-scale hazardous waste incineration system equipment of 30 tons, 50 tons, and even 100 tons, thermal energy resources are wasted. The situation has also become increasingly prominent. China mainly adopts air-cooled or water-cooled forms, which reduces a large amount of thermal energy produced by incineration and discharges it. Not only wasted thermal energy but also increased water and electricity consumption, which is far from the level of foreign technology. Therefore, the development of waste heat recovery step utilization technology for hazardous waste incineration is of great significance for energy recovery and reduction of energy consumption. ℃的烟气,由于该烟气中具有大量的腐蚀性气体和烟尘,无法直接进行利用,因此必须要通过余热锅炉进行换热,将其热源转变成饱和蒸汽进行利用。 I. Waste heat boiler technology Hazardous waste can be used to generate a large amount of 1100 ℃ flue gas after being fully burned by the incineration system. Due to the large amount of corrosive gas and smoke in the flue gas, it cannot be directly used. Heat, transforming its heat source into saturated steam for utilization.

Conventional waste heat boilers use water-pipe convection heat exchange waste heat boilers. Due to the particularity of hazardous waste incineration flue gas, ash deposits and corrosion problems are often prone to cause shutdowns. The waste heat boiler adopts a self-developed single-bowl film-type wall waste heat boiler. The biggest advantage of this type of waste heat boiler is that it is mainly radiative heat transfer and does not have a convective heat exchange surface, so the boiler body and flue gas do not block up. Without dust removal and low smoke resistance, it can run continuously for a long time. At the same time, the waste heat boiler will discharge sewage and expand the container during the set period, and regularly discharge sewage. The flue gas from the incineration enters the waste heat boiler through the flue of the second combustion chamber, flows in the space composed of the membrane wall of the waste heat boiler, and the boiler water is in the tube.

The flue gas close to the membrane wall is longitudinally scoured, the flue gas temperature is low, and the high-temperature flue gas flowing in the middle of the channel transfers heat to the low-temperature flue gas, which is mainly radiative heat transfer and a small amount of convective heat transfer. This type of boiler is the only waste heat boiler that does not need to stop the furnace to clean the ash and has the longest continuous operation time. It is not easy to cause low temperature or high temperature corrosion in the hazardous waste incineration system. The waste heat boiler is equipped with a sub-cylinder, which can supply steam to multiple steam units at the same time, to achieve the uniformity and stability of steam distribution, and is the basis for ensuring the cascade utilization of steam waste heat recovery. ℃,烟气必须在500 ℃至200 ℃在急冷塔中进行急冷,以减少二噁英类物质的再合成。 2. Quenching tower technology According to the national standard, the heat utilization of the flue gas of the waste heat boiler can only reach 500 ℃. The flue gas must be quenched in the quenching tower at 500 ℃ to 200 ℃ to reduce the resynthesis of dioxins.

℃的烟气将进入急冷塔,急冷塔为自主研发的一体化的急冷塔:通过双流体的喷枪向塔内喷射水雾,高温烟气与雾化喷淋水雾直接接触,使得烟气在1秒钟内与水雾接触蒸发汽化,通过热交换,迅速放热由500 ℃降至200 ℃以下,此过程可以有效地避免二噁英类物质的再合成。 The flue gas at 500 ℃ at the exit of the waste heat boiler will enter the quench tower. The quench tower is an integrated quench tower independently developed: water mist is sprayed into the tower through a two-fluid spray gun. This allows the flue gas to evaporate and vaporize in contact with the water mist within 1 second. Through heat exchange, the heat is rapidly reduced from 500 ℃ to less than 200 ℃. This process can effectively avoid the resynthesis of dioxins. At the same time, by detecting the temperature of the flue gas in the quench tower, the flow rate and pressure of compressed air and spray liquid, the liquid flow to the spray gun is controlled to ensure the stability of the exit temperature of the quench tower. Alkali can also be added during quenching, and it also has the effect of deacidification. Therefore, the function of the quenching deacidification tower can be taken into account. When the subsequent dry or wet deacidification system is faulty or inefficient, it can be added in quenching water. The lye acts as a semi-dry deacidification and serves as an effective backup supplement for the deacidification system.

℃,压力在6-10公斤。 Third, the first-stage waste heat recovery technology Saturated steam generated by the waste heat boiler, the temperature is 150-160 ℃, and the pressure is 6-10 kg. 除氧器、全自动软水器等)50吨的危险废物焚烧项目可以产生6-7/小时的蒸汽。 Excluding the gas used by the waste heat boiler ( deaerator, automatic water softener, etc. ) , a 50- ton hazardous waste incineration project can generate 6-7 tons / hour of steam. As a high-quality heat source, it can be fully developed and used in hazardous waste incineration systems to reduce energy consumption and increase output value. The first-level waste heat recovery and utilization technology is mainly aimed at the use of saturated steam to tap the potential of hazardous waste incineration systems. First of all, it can be used for flue gas heaters and air heaters of hazardous waste incineration systems. ~ 70 ℃左右,此时如果排放,容易在产生白烟,造成较差感官效果,同时如果脱酸不彻底,也会因为结露的情况,对湿法洗涤塔后续设备、管道和烟囱等造成腐蚀。 Hazardous waste incineration systems are often equipped with wet scrubbing systems. After the wet scrubbing and deacidification treatment of high temperature flue gas, the flue gas temperature drops to about 60 to 70 ° C. At this time, if it is discharged, it is easy to produce white smoke and cause poor sensory. At the same time, if the deacidification is not complete, it will also cause corrosion to the subsequent equipment, pipes and chimneys of the wet scrubbing tower due to condensation.

℃以上,可以有效避免上述问题。 Therefore, by passing steam into the flue gas heater and heating the flue gas above 140 ° C after heat exchange, the above problems can be effectively avoided. Hazardous waste incineration systems also have a wide variety of incineration materials, and the characteristics of incineration conditions fluctuate greatly. Therefore, through the air heater, the secondary air is heated and passed into the incinerator, which can increase the temperature of the combustion-supporting air and stabilize the combustion effect. Therefore, the development and application of flue gas heaters and air heaters have an important role in optimizing hazardous waste incineration systems, and can save energy and improve the level of environmental protection. 一般在80%含水率以上) ,热值低,一旦量大,非常容易影响正常的焚烧工况,或者需要大量辅助燃料,增加能耗和运行成本。 Second, considering that hazardous waste contains more hazardous waste sludge, this type of hazardous waste has a high moisture content ( generally above 80% moisture content ) , a low calorific value, and once the amount is large, it is very likely to affect normal incineration conditions. Or a large amount of auxiliary fuel is needed, which increases energy consumption and operating costs.

30%的含水率,再进入焚烧炉中进行焚烧,污泥体积可以减少75%左右、热值提高三倍以上,基本上可以不再使用辅助燃料。 Therefore, for the hazardous waste sludge, increase the sludge dryer equipment, make full use of saturated steam resources, dehydrate the hazardous waste sludge by thermal drying means to a moisture content of 20 to 30% , and then enter the incinerator for incineration. Sludge The volume can be reduced by about 75% , and the heating value can be increased by more than three times. Basically, auxiliary fuel can be eliminated. 以桨叶式污泥干燥机为主要研发对象) ,对于具有一定规模的危废焚烧厂来说具有非常好的经济价值。 Therefore, the development of a sludge dryer system suitable for hazardous waste systems ( with paddle-type sludge dryers as the main R & D object ) has very good economic value for hazardous waste incineration plants with a certain scale. Fourth, two-stage waste heat power generation technology Waste heat power generation technology has been widely used in domestic waste incineration plants, and the most widely used technology is the steam turbine generator set.

But the waste heat incineration of hazardous waste is still in its infancy. Due to the relatively small amount of thermal energy that can be generated during hazardous waste incineration, the instability of incineration conditions, the large fluctuations in steam, and the high requirements for maintenance and use of steam turbine units, conventional steam turbine generator sets are not suitable for hazardous waste incineration plants. in. Two-stage waste heat power generation technology considers the use of screw generators to generate excess steam for power generation. The screw expansion generator set is the only heat power engine that can be used for superheated steam, saturated steam, steam-water two-phase wet steam and hot water at the same time at home and abroad. It does not require high steam quality, and is suitable for large-scale fluctuations of heat source parameters. Simple operation and maintenance Therefore, it is very suitable for hazardous waste incineration treatment systems.

吨的危废焚烧系统经过余热锅炉自身用汽和一级余热回收利用后,平均还可以剩余 4-5 吨的饱和蒸汽。 After the 50- ton hazardous waste incineration system has used the waste heat boiler's own steam and the first-stage waste heat recovery and utilization, an average of 4-5 tons of saturated steam can be left . 200kw 的电能,如采用两级机组,还能多产生约 100kw 的电能。 The screw expansion generator set can generate about 200kw of electricity per hour . If a two-stage unit is used, it can also generate about 100kw more. The generated electricity can be used to supplement the system's own power consumption and greatly reduce operating costs. The research and development and utilization of secondary waste heat power generation can reduce the enterprise's thermal pollution while improving the energy efficiency of the enterprise, and the economic benefits are good, which is also fully in line with national energy conservation and emission reduction policies. 通过一级和二级的余热回收利用,产生的乏汽仍然具有一定的热焓,如果无组织排放,不但浪费能源,还会对环境产生一定的影响 Fifth and third-stage waste heat recovery and utilization technology Through the first and second-stage waste heat recovery and utilization, the exhaust steam generated still has a certain enthalpy. If there is no organized emission, it will not only waste energy, but also have a certain impact on the environment.

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