I. Overview Coal-fired drying ovens generally have the characteristics of low production temperature and difficulty in temperature control. However, coal-fired drying furnaces are generally used by manufacturers because they have lower production costs than furnaces that use other energy sources.
The dust control of coal-fired drying ovens in China mainly includes two types of post-furnace technology and pre-furnace technology. The post-furnace technology includes traditional “post-treatment†technology such as water dust removal and bag dust removal. The pre-furnace technology mainly refers to the “pre-handling†technology developed in recent years, that is, through the redesign of the kiln body, through a series of materialization processes. And by the action of a catalyst such as rare earth, the volatile matter is fully burned in the furnace to achieve the purpose of eliminating smoke and dust.
Second, the governance technology brief description of the traditional post-furnace treatment technology, specifically, there are wet, dry, semi-dry methods. The wet method mainly uses water foam and water mist to capture soot particles, and generally has an impact water bath dust remover, a spray tower, a venturi scrubber, and the like. The wet method can not meet the environmental protection requirements for the dust removal with smaller particle size; secondly, the water vapor forms acid mist, which is seriously corrosive to fans, pipelines and chimneys. In addition, the power is too large, the operation cost is high, and it is promoted on the drying furnace. It is more difficult. Dry and semi-dry methods include multi-tube dust removal, bag dust removal and electrostatic dust removal. Multi-tube dust removal has a certain effect on coarse dust with a particle size larger than 60um, but there is almost no capture effect on small particles of dust and carbon black. The effect of bag dust removal depends on the quality of the bag. The poor quality bag has poor collection effect on soot and carbon black, and is easy to block and corrode. The high quality bag effect is relatively good, but the input is large, the use cost is high, and the use is compared. Complex, high requirements for the operation of workers. Electrostatic dust removal has a certain catching effect on soot of various particle sizes, but its early investment is large, the power consumption during operation is large, the running cost is high, and the electrodes are broken down, and the maintenance cost of the equipment is high.
The pre-furnace technology mainly achieves the purpose of full combustion by changing the combustion mode of coal, the combustion conditions and the chemical molecular structure of volatile matter. The stealth combustion technology introduced by our company belongs to the pre-furnace technology, which has the characteristics of small engineering investment, low operating cost, short investment recovery period and low labor intensity of the furnace.
III. Introduction to Invisible Combustion and Smoke Elimination Technology Invisible combustion and smoke elimination technology is a developing edge discipline, which is a combination of aerodynamics, quantum mechanics and coal chemistry.
The coal-fired drying furnace uses ordinary bituminous coal as fuel to convert chemical energy into heat energy by burning coal, heating and drying the refractory material, abrasive or abrasive tools (such as grinding wheels, etc.). The traditional drying furnace mainly relies on the suction of the chimney to draw in the combustion air from below the grate, which is in a natural burning state. Under this combustion condition, when coal is added to the kiln and the heat reaches 130 °C or above, the volatile components in the coal will precipitate, forming a thick yellow coarse gas, most of which are aromatic hydrocarbon macromolecules. Good fuel. If the combustion conditions are very satisfactory, it can be completely burned, and the product is a gas such as carbon dioxide, and the remaining ash is left. However, the crude gas is produced above the coal-fired layer and is in an oxygen-deficient position, and the combustion is insufficient. At high temperatures, the aromatic hydrocarbon macromolecules are cleaved into polycyclic compounds. Some of the polycyclic compounds continue to crack to produce carbon black-based substances, which are concentrated by the chimney to form a black smoke.
The hidden combustion and smoke elimination technology considers the clean combustion process of coal as a whole. Important include: front-end systems, cyclone air intake systems, dedicated catalytic systems, and rear systems. The front system is a combustion device that not only provides the heat generated by combustion, but also plays a functional role. The cyclone air intake system provides intermittent and time-sharing cyclone air intake to form a “physical spaceâ€, which is simply to provide some kind of “soil or hotbedâ€. It is a collection of geometrical shapes, gas compositions, etc. of a series of combustion devices, and uses a special catalytic system (non-precious metal catalysis) to improve the activity of the crude gas, optimize the physical and chemical conditions of the crude gas in the furnace, improve the combustion conditions, and make it Try not to crack into carbon black before leaving the furnace to reduce the formation of black smoke. At the same time, the rear system is activated to solve the residual smoke problem.
The dust control of coal-fired drying ovens in China mainly includes two types of post-furnace technology and pre-furnace technology. The post-furnace technology includes traditional “post-treatment†technology such as water dust removal and bag dust removal. The pre-furnace technology mainly refers to the “pre-handling†technology developed in recent years, that is, through the redesign of the kiln body, through a series of materialization processes. And by the action of a catalyst such as rare earth, the volatile matter is fully burned in the furnace to achieve the purpose of eliminating smoke and dust.
Second, the governance technology brief description of the traditional post-furnace treatment technology, specifically, there are wet, dry, semi-dry methods. The wet method mainly uses water foam and water mist to capture soot particles, and generally has an impact water bath dust remover, a spray tower, a venturi scrubber, and the like. The wet method can not meet the environmental protection requirements for the dust removal with smaller particle size; secondly, the water vapor forms acid mist, which is seriously corrosive to fans, pipelines and chimneys. In addition, the power is too large, the operation cost is high, and it is promoted on the drying furnace. It is more difficult. Dry and semi-dry methods include multi-tube dust removal, bag dust removal and electrostatic dust removal. Multi-tube dust removal has a certain effect on coarse dust with a particle size larger than 60um, but there is almost no capture effect on small particles of dust and carbon black. The effect of bag dust removal depends on the quality of the bag. The poor quality bag has poor collection effect on soot and carbon black, and is easy to block and corrode. The high quality bag effect is relatively good, but the input is large, the use cost is high, and the use is compared. Complex, high requirements for the operation of workers. Electrostatic dust removal has a certain catching effect on soot of various particle sizes, but its early investment is large, the power consumption during operation is large, the running cost is high, and the electrodes are broken down, and the maintenance cost of the equipment is high.
The pre-furnace technology mainly achieves the purpose of full combustion by changing the combustion mode of coal, the combustion conditions and the chemical molecular structure of volatile matter. The stealth combustion technology introduced by our company belongs to the pre-furnace technology, which has the characteristics of small engineering investment, low operating cost, short investment recovery period and low labor intensity of the furnace.
III. Introduction to Invisible Combustion and Smoke Elimination Technology Invisible combustion and smoke elimination technology is a developing edge discipline, which is a combination of aerodynamics, quantum mechanics and coal chemistry.
The coal-fired drying furnace uses ordinary bituminous coal as fuel to convert chemical energy into heat energy by burning coal, heating and drying the refractory material, abrasive or abrasive tools (such as grinding wheels, etc.). The traditional drying furnace mainly relies on the suction of the chimney to draw in the combustion air from below the grate, which is in a natural burning state. Under this combustion condition, when coal is added to the kiln and the heat reaches 130 °C or above, the volatile components in the coal will precipitate, forming a thick yellow coarse gas, most of which are aromatic hydrocarbon macromolecules. Good fuel. If the combustion conditions are very satisfactory, it can be completely burned, and the product is a gas such as carbon dioxide, and the remaining ash is left. However, the crude gas is produced above the coal-fired layer and is in an oxygen-deficient position, and the combustion is insufficient. At high temperatures, the aromatic hydrocarbon macromolecules are cleaved into polycyclic compounds. Some of the polycyclic compounds continue to crack to produce carbon black-based substances, which are concentrated by the chimney to form a black smoke.
The hidden combustion and smoke elimination technology considers the clean combustion process of coal as a whole. Important include: front-end systems, cyclone air intake systems, dedicated catalytic systems, and rear systems. The front system is a combustion device that not only provides the heat generated by combustion, but also plays a functional role. The cyclone air intake system provides intermittent and time-sharing cyclone air intake to form a “physical spaceâ€, which is simply to provide some kind of “soil or hotbedâ€. It is a collection of geometrical shapes, gas compositions, etc. of a series of combustion devices, and uses a special catalytic system (non-precious metal catalysis) to improve the activity of the crude gas, optimize the physical and chemical conditions of the crude gas in the furnace, improve the combustion conditions, and make it Try not to crack into carbon black before leaving the furnace to reduce the formation of black smoke. At the same time, the rear system is activated to solve the residual smoke problem.
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