49 results about "Coal combustion products" patented technology

A method and system for reducing the un-burned carbon content in coal combustion products are disclosed. A coal combustion product is separated into a coarse particle fraction and a fine particle fraction, and the coarse particles are comminuted by milling, grinding or the like. Additives may be added of the coarse particles prior to comminution. The comminuted particles are then co-combusted with coal to burn at least a portion of the un-burned carbon contained in the original coal combustion product.

The invention discloses an oxygen volume adjusting method for a pulverized coal boiler after a change of coal type. The method comprises the following steps: a grid structure model of the pulverized coal boiler is built; a mathematical model of various physical and chemical processes generated in pulverized-coal combustion is built; the pulverized-coal combustion process after the change of coal type is simulated to obtain the corresponding relation between various oxygen volumes and the burning performance indexes of the pulverized coal boiler; and the oxygen volume of the pulverized coal boiler is adjusted to allow the pulverized coal boiler to meet preset burning performance indexes. In addition, the invention further discloses an oxygen volume adjusting method for the pulverized coal boiler after the change of coal type. The method and system provided by the invention can improve the accuracy rate and security of pulverized coal boiler oxygen volume control after the change of coal type, solve the problems of unstable furnace combustion and low combustion efficiency easily caused by manual control, and simultaneously greatly reduce pollutants produced during the process of combustion.

The invention discloses a smoke concentration adjustment method after the fire coal variety of a pulverized coal boiler is changed. The smoke concentration adjustment method after the fire coal variety of the pulverized coal boiler is changed comprises the following steps: establishing a meshing structural model of the boiler, establishing a mathematical model of each physical and chemical process formed by combustion of pulverized coal; imitating a pulverized coal combustion process after the fire coal variety of the pulverized coal boiler is changed, and obtaining a corresponding relation between various smoke concentration situations and boiler combustion performance indexes; and adjusting the smoke concentration of the boiler so that the boiler meets preset combustion performance indexes. Besides, the invention further discloses a smoke concentration adjustment system after the fire coal variety of the pulverized coal boiler is changed. The smoke concentration adjustment method and the smoke concentration adjustment system after the fire coal variety of the pulverized coal boiler is changed can improve the accuracy and safety of smoke concentration control after the fire coal variety of the pulverized coal boiler is changed, resolve the problems of unstable combustion in the boiler and low combustion efficiency easily caused by manual control, and largely lower pollutants produced in the combustion process.

The invention discloses a pulverized coal jet flow midstream and downstream combustion organization method in a tangent circle pulverized coal combustion boiler. Corresponding wall air nozzles are distributed in a hearth main combustion area of the pulverized coal combustion boiler in a manner of corresponding to primary air pulverized coal combustors, and are formed in the positions, close to the pulverized coal jet flow midstream and downstream positions of outlets, of a hearth water cooling wall, part of hot air is introduced into the wall air nozzles, and is directly sprayed into the corresponding primary air pulverized coal jet flow midstream and downstream interval in a jet flow manner, pulverized coal jet flow midstream and downstream combustion organization is carried out, the oxygen concentration and the pulverized coal combustion rate of the pulverized coal jet flow midstream and downstream interval are improved, and wall attaching happening of the pulverized coal jet flow midstream and downstream interval is directly obstructed. According to the method, pulverized coal jet flow midstream and downstream interval combustion organization and control can be achieved, happening of water cooling wall coking and high-temperature corrosion is prevented, the pulverized coal combustion efficiency is further improved, NOx generation and emissions are reduced, the proper combustion capacity of the pulverized coal combustion boiler for combustion low-volatile lower-ash-melting-point coal is expanded, and the fuel procurement cost is reduced.

The invention discloses a preparation method of a desulfurization, dedusting and coal combustion promoter, and is characterized in that the method comprises the following process steps: according to the mass percentage concentration, adding 20%-30% of potassium nitrate, 10-16% of aluminum nitrate, 12-20% of calcium carbonate, 5-10% of potassium permanganate, 15-25% of soluble starch, 4-10% of ferric chloride and 8-18% of betaine into a reactor, wherein the sum of the percentages of all the components is 100%; and mixing evenly, and thus obtaining the coal desulfurization, dedusting and coal combustion promoter. The preparation method has the advantages of simple preparation process, low production cost and easy industrialized production, is not corrosive to a boiler with long-term use, can also reduce fouling of calcium sulfate in the boiler, improves the service life of the boiler, and improves the combustion efficiency of coal.

The invention discloses a catalyst for catalyzing simultaneous coal char combustion and in-situ denitration and an application method thereof, belonging to the technical field of efficient catalytic combustion of coal and coke and pollutant emission reduction. According to the invention, Fe or a Fe and CaO composite or a Fe and CeO2 composite is selected as the catalyst, and under the condition that the addition amount of the catalyst is 1-15% of the mass of coal char and the mass ratio of Fe to CaO or Fe to CeO2 is 0.1-3, the ignition point of the coal char can be reduced, the burning rate ofthe coal char can be improved, and meanwhile, the NOx emission amount in the coal char combustion process can be effectively reduced. The catalyst can reduce the ignition temperature and burnout temperature of coke powder by 15.1 DEG C and 68.8 DEG C respectively, and the NO emission reduction rate can reach 39.6%. The catalyst is cheap and easy to obtain, realizes high-efficiency utilization ofwaste, also has simple operation and easy realization in use process, and has good application prospect.

The invention relates to a chemical product and especially relates to a coal combustion improver. The coal combustion improver can improve a coal combustion rate and reduce pollution. The coal combustion improver is characterized by comprising 30 to 35% of calcium oxide, 20 to 25% of iron oxide, 30 to 45% of active carbon and 10 to 15% of a binder. The coal combustion improver has the advantages of low energy consumption, simple formula, simple processes, low cost and good smoke removal effect and can be widely used for industrial and civil soft coal.

The invention discloses a method for preparing a desulfurizer from coal cinder, which comprises the following steps: firstly, placing the coal cinder into a soaking pool, and filling soaking water for soaking; and secondly, detecting the pH value of a soak solution after soaking in the soaking water, and generating the desulfurizer which can be directly poured on coal to be combusted when the detected pH value reaches more than 12. By adoption of the method to prepare the fuel coal desulfurizer, not only the coal cinder generated by coal combustion in various coal combustion yards can be fully utilized but also the prepared desulfurizer has strong desulfurization effect on flue gas generated by coal combustion, realizes reutilization of waste coal cinder, saves the desulfurization cost, reduces resource waste, and simultaneously can also simplify the desulfurization technology and reduce the cost of the desulfurizer and equipment.

The invention relates to a biological clean type composite fuel and a preparation method thereof. The fuel is prepared from the following raw materials in parts by weight: 80-150 parts of raw coal, 15-45 parts of plant straws, 5-20 parts of water and 1-2 parts of a microbial bacteria solution. The preparation method specifically comprises the following steps of: treating the raw coal with the microbial bacteria solution; converting sulfur in the raw coal into a salt through an accumulating reaction; removing sulfur in the raw coal through a coal washing process to obtain desulfurized coal with a relatively low sulfur content; and then extruding and forming the desulfurized coal and the plant straws through molded coal forming equipment at a certain temperature and pressure to obtain the biological clean type composite fuel. By combining a biological desulphurization technology with a biomass molded coal manufacturing technology, the obtained product has the advantages of being high in compressive strength, low in full sulfur content and high in heat of combustion. More importantly, the environmental pollution problem in the coal combustion process is solved, and the fuel has a good ecological benefit; and meanwhile, preparation of the biological clean type composite fuel product opens up a novel path for utilization of biomass energy sources such as straws.