Implementation and Author: Beijing Jinyu mangrove Environmental Protection Technology Co., Ltd. Technical introduction This project studies the pretreatment technology for the preparation of alternative fuels for industrial hazardous wastes and the industrialization of the technology. The specific contents include: (1) According to the physical form of industrial hazardous waste, the pretreatment technology is studied in two directions: solid waste and semi-solid. The semi-solid waste mainly composed of paint residue is modified to reduce its water content by the normal physical method at room temperature. Rate, and then prepared by the quenching and tempering to prepare a single fuel with a stable heat value; the industrial solid wastes are prepared into solid-state alternative fuels with specific particle size through reasonable transportation and crushing processes; Independent intellectual property rights use of industrial hazardous wastes to prepare alternative fuels for pretreatment process technology and establish a process package; 3 industrialization of pretreatment technology to solve the process, equipment and other issues in the process of amplification; 4 incineration of alternative fuel products The impact on cement kiln. Innovation 1 Semi-solid wastes change their dewatering performance by adding one or several, a certain proportion of modifiers using hazardous waste as raw materials, so that their water content can be reduced to below 60% under normal temperature conditions by using conventional dewatering equipment . Granular alternative fuels are prepared by adding one or several, a certain proportion of impregnating agents to achieve a stable state of heat value, single nature, and easy transportation. (Support material: ZL201110401916.4, ZL201120506226.0) 2 Solid wastes Through the full investigation of materials, the key parts of the existing crushing equipment, such as the cutter head and material, are technically transformed, and finally the crushing equipment suitable for industrial wastes is developed to prepare the sheet-shaped alternative fuel. The prepared flake-shaped alternative fuel is introduced into the kiln using a self-designed pneumatic conveying device. (Support material: ZL201120017055.5) Application effect Through the above research, two pre-treatment production lines (semi-solid and solid) for the preparation of alternative fuels for industrial hazardous wastes were built into pre-treatment centers, and the “pretreatment + cement kiln terminal disposal†mode was realized. After pretreatment, the components are homogenized and stabilized, which greatly reduces the risk during storage and subsequent disposal, reduces the impact on cement production, and finally cooperates with the original disposal facilities to maximize the disposal of hazardous waste. The ability to carry out hazardous waste disposal in a scientific and standardized way, while maximizing the characteristics of the waste itself and realizing the effect of using waste instead of fuel. After the completion of the pretreatment center, 14,000 tons of semi-solid and solid waste can be disposed of at full capacity every year. The disposal fee per ton is 1,500 yuan, the annual operating income is 21 million yuan, and the total annual profit is 6.73 million yuan. A case where two lines of full load operation, the annual waste can be prepared semi-solid alternative fuels 2400 t, 5400 t solid waste alternative fuels, alternative fuels two alternative fuel may be coal 4440 tons per year, the cost savings of approximately 310 coal cement enterprise Ten thousand yuan (calculated according to the unit price of coal burning of 700 yuan per ton). At present, the technology is extended to Beijing Ecological Island Technology Co., Ltd., Beijing Taihang Prospect Cement Co., Ltd., and Hebei Jinluo Mangrove Environmental Protection Technology Co., Ltd. After the project is completed and tested, through the strict control of materials and the improvement of some equipment, the two pretreatment production lines have reached the design capability. For the centralized management and disposal of hazardous wastes in the city and the extension of the service period of the treatment facilities, To an important role. The research and development and application of this technology will play a demonstration effect and promote the development of China's cement kiln co-processing hazardous waste technology and the reduction of energy resource consumption by the cement enterprise and reduce the emission of CO2 and other pollutants, which is conducive to low emission and high cement enterprises. The transformation of energy-efficient and high-efficiency environmental protection enterprises will enhance the sustainable development capability of cement enterprises. Technical details The co-processing of hazardous wastes in cement kilns has many advantages in terms of harmlessness level, pollution control, construction investment and operating costs. It is a method for the harmless treatment and resource utilization of urban industrial wastes suitable for China's national conditions. When co-processing hazardous wastes, cement companies must ensure that cement performance, production processes and the environment are not greatly affected, requiring higher safety precautions and more professional technicians. At present, China's industrial hazardous wastes have high water content, unstable composition and calorific value, and complex physical state. When they are directly used in cement kiln co-disposal, they cannot be fully dispersed. The waste is not fully burned, the incineration is not complete, and the cement kiln working conditions are affected. Product quality, exhaust emissions and waste disposal volume have different degrees of impact; in addition, long-term disposal of untreated waste will increase the frequency of cement kiln maintenance, and the disposal of hazardous waste in cement kiln during maintenance period has to be temporarily stopped, affecting the normal production of cement. At the same time, the amount of waste disposal is greatly reduced. Therefore, industrial hazardous wastes are pretreated to homogenize and stabilize the components, which can reduce the negative impact on the kiln working conditions during the waste disposal process, increase the amount of waste disposal in the cement kiln, and solve the danger of co-processing with cement kiln. The above difficulties encountered in waste. 1 process plan and technical route 1.1 Semi-solid paint residue dehydration preparation alternative fuel pretreatment production line 1.1.1 Brief description of the process principle The process improves the viscosity of the paint residue by retaining the modification of the paint residue and other wastes, while reducing the viscosity of the paint residue, making it easy to dehydrate, and then dehydrating the paint residue by physical methods, and The mixing of other impregnating agents will affect the unfavorable factor of the comprehensive calorific value of the lacquer slag - the high water content problem will be solved, so that the effluent waste which is originally wet, sticky, easy to agglomerate and has low comprehensive calorific value becomes a uniform, dispersed, An alternative fuel with a high calorific value and easy to transport and store, turning waste into treasure and realizing a circular economy. 2 process The process steps are as follows (see the process flow chart for details): 1 paint residue receiving: The high water content paint slag (water content higher than 90%) is put into the raw material tank, and after thorough mixing and homogenization, it enters the linear vibrating screen to filter and remove impurities, and the small particle impurities in the high water content paint residue are filtered out, and the impurities are collected. Dispose of separately. Undersize and then further through the solenoid iron removal to continue into the cache in addition to the material for iron after homogenization tank. After the homogenized material passes through the screw pump, the material can be transported to the two sets of mixing tanks respectively. The low water content paint slag (water content 70%-80%) enters another raw material tank, and the low water content paint slag is transported into two sets of mixing tanks through the screw conveyor and the two-way screw conveyor, and the high and low water content paint slag is blended. Adjust the tank to a moisture content of 90%. 2 paint residue preparation: There are two options for the paint slag blending process. Modifier solution: The modifier temporarily stored in the modifier tank is transported to two sets of mixing tanks through a two-way belt conveyor and two belt conveyors, and is blended with paint slag having a moisture content of 90%, according to the treatment lacquer The nature adjusts the blending ratio. Formulation mixing scheme: other semi-solid wastes that can disperse into the compounding tank, and the preparations are transported to two sets of mixing tanks through a screw conveyor and a two-way screw conveyor, and are blended with paint slag having a moisture content of 90%. According to the nature of the paint residue and the properties of different formulations, the ratio is adjusted. 3 slag filter: The paint slag with a water content of 90% is thoroughly mixed with the formulation or modifier under the stirring action of the two sets of mixing tanks to form a mixture. The mixture is pumped to the filter press for dehydration, and the flow monitoring is set after the pump. The amount of disposal of the production line is measured. The filter cake formed after dewatering is transported to a storage area by a conveyor for temporary storage. 4 alternative fuel production: Dehydrated paint slag and other dry paint slag (water content less than 60%) are transported to the crusher through a belt conveyor. The crushed dehydrated paint slag forms fine particles of uniform shape, enters the buffer warehouse, and is then sent through the screw conveyor. Into the mixer, fully mixed with the impregnating agent and the modifier in a certain ratio, and the mixing ratio is determined according to the properties of the paint residue and the particle size of the different batches of the impregnating agent. After mixing, form an alternative fuel product. 3 process control standards The average particle size of the alternative fuel produced by the pretreatment of the paint residue with 90% moisture content is ≤5mm, the moisture content is 40%-50%, the average calorific value is 3000kcal/kg, and the heavy metal leaching toxicity is lower than the GB5085.3-1996 hazardous waste. Identify the limits specified in the Standard Leaching Toxicity Identification. The material form (grain size and moisture) meets the requirements of the continuous importation process into the prospective cement plant kiln, and its calorific value can meet the requirements of alternative fuels. Solid waste waste crushing preparation alternative fuel pretreatment production line 1 process principle The solid waste pretreatment technology is mainly for solid wastes with high flammability and high calorific value, such as organic solvent waste, paint waste, oily waste, etc. It is characterized by a variety of varieties, large volume and irregular shape, and the density difference is different. Big. If it is to be used as an alternative fuel for cement rotary kiln, it must be sorted and crushed to meet the requirements of continuous and stable kiln incineration, so as to achieve fuel replacement for cement production. {In addition, according to the information provided by mangroves, there are many soft materials such as waste oil cotton yarn, waste rags, and waste plastic cloth in solid hazardous waste. After testing and verifying, it is necessary to have a high differential ratio for breaking such materials (the parameters are also combined). Crusher manufacturers jointly explore), the toughness of the material of the knife, and the prospect of the crusher is the jaw crush is not a shear crusher, the crushing object is a block of hard waste, not suitable for soft substances, the ecological island is currently The crushing equipment cannot meet the crushing requirements as an alternative fuel. It is still necessary to use a special new crushing device for pretreatment. } According to the waste calorific value test report, after the combustible and high calorific value solid waste enters the warehouse, the raw materials are first manually sorted, and the hard materials such as stones and metals and the waste larger than the crusher feed size are selected. So as not to damage the broken equipment. The material suitable for crushing is manually or mechanically placed into the receiving hopper located in the ground. The large angle belt conveyor under the hopper conveys the material into the first-stage shearing crusher. The crusher outlet is provided with a sieve plate to meet the grain size requirements. It is possible to enter the next process, and if it does not meet the requirements, it can be repeatedly crushed in the crusher until it is qualified (less than 100 mm). The material with qualified particle size enters the secondary crusher. After the crushed material has a particle size of less than 10 mm, it enters the belt conveyor. It is sent to the special metal box by the belt conveyor and packaged and sent to the cement company for alternative fuel. In order to improve the efficiency of the crusher, a forced push device is added to the feed port of the crusher. In order to adapt to the difference in performance of different materials, the power of the crusher is driven by a hydraulic pump to meet the demand of different materials. The whole production line is equipped with a dust collector according to the dust point situation, and a mechanical exhaust system is set at the same time, and the volatile gas is discharged after being treated by the activated carbon exhaust gas purification device. 2 process control standards According to the above process, the calorific value of the alternative fuel after two-stage crushing pretreatment is about 5000 cal/g, the water content is less than 10%, the average particle size can reach about 10 mm, and the material form (grain size and moisture) meets the continuous stability and enters the prospect cement factory cement. The import process requirements for kiln incineration disposal, the calorific value can meet the requirements of alternative fuels. Other Surface Treatment Parts Processing Stainless Steel Process,Other Surface Treatment Parts Processing,Structural Ceramic Parts Processing,Sand Blasting Parts Processing Dongguan Kingswin Wing Tat Metal Products Co., Ltd. , https://www.milling-turning.com
Technical Name: Study on Pretreatment Technology for Preparation of Alternative Fuels for Industrial Hazardous Wastes