52results about How to "Reduce carbon content in fly ash" patented technology

The invention relates to a combustion improvement technology of an industrial fire coal boiler, aiming to provide a low NOx coal dust combustion method and device based on underfire air and overfire air. The method comprises: injecting parts of two-strand air required for combustion into a hearth from a boiler bottom ash hopper; strongly mixing with aslant downward injected fuel jet flow; fully utilizing the space of the bottom ash hopper to prolong smoke dwell time; burning fuel in a low-temperature oxidation zone; preventing volatile components from converting to nitric oxide; upwards and aslant injecting upper-layer fuel to form a reducing zone, so as to reduce generated nitric oxide into N2; and lowering nitric oxide emission amount. The invention also provides a boiler device for realizing the method. Under the condition that the original combustion condition is not influenced essentially, the invention effectively lowers the emission of nitric oxide and is easy to reform the existing boiler.

The invention discloses a low-nitrogen combustion technique based on circulating fluidized bed boiler. The circulating fluidized bed boiler comprises a boiler body, a cyclone separator, a deduster, an induced draft fan, a primary air supply system and a secondary air supply system which are connected in sequence. A smoke recirculation pipe is drawn out behind the induced draft fan. The primary air supply system and the secondary air supply system are connected to the smoke recirculation pipe in parallel. A burn-out chamber is arranged at an outlet of the cyclone separator. The low-nitrogen combustion technique based on the circulating fluidized bed boiler comprises the following steps that pulverized coal enters the boiler body under the action of primary air, specifically, the amount of smoke recirculation air in the primary air accounts for 8-10% the total air amount of the primary amount, and the amount of the primary air accounts for 40-45% of the total air amount; secondary air is introduced into the boiler body through the secondary air supply system, specifically, the amount of smoke recirculation air in the secondary air accounts for 12-14% the total air amount of the secondary air; fine flying ash enters the burn-out chamber; and over fire air is introduced into the burn-out chamber. According to the low-nitrogen combustion technique based on the circulating fluidized bed boiler, the burn-out chamber is arranged at the outlet of the separator, and part of smoke is mixed into the primary air and the secondary air, so that generation of NOx is reduced.

The invention relates to a low-nitric-oxide direct-current pulverized coal combustor adaptive to a meager coal boiler, which can achieve stable and economical combustion, and also reduces nitric oxide emission to the lowest level, so that the low-nitrogen combustion modifying technique of the meager coal boiler is improved. The low-nitric-oxide direct-current pulverized coal combustor adaptive to the meager coal boiler comprises main combustor groups which are arranged on four corners of a hearth of the meager coal boiler in a four-angle tangential circle combustion mode, are matched with a water-cooling wall high-temperature-prevention corrosion system of the hearth, and are identical in structure; each main combustor group comprises pulverized coal combustors arranged at intervals and secondary air spray ports; the upper parts of the main combustor groups are provided with corresponding separation burnout air groups; a layer of precombustion chamber back flow combustor is arranged in each n-layer of pulverized coal combustors; the jet flow rotation direction of the main combustor groups is the anticlockwise direction; the rotation direction of secondary air ports close to the upper parts of the precombustion chamber back flow combustors is the clockwise direction, and the imaginary tangential circle diameter is greater than the imaginary tangential circle diameter of the main combustors; separation burnout air groups include upper groups and lower groups; and the jet flow of the lower groups is in an imaginary tangential circle mode, and the jet flow of the upper groups is in an opposed combustion mode.

A cyclone burner and an air burnout arrangement structure for a boiler relate to cyclone burners and air burnout arrangement structures, and solve the problems of low boiler combustion efficiency and intensification of rear wall slagging and high temperature corrosion of an existing air burnout arrangement structure with the cyclone burner arranged on a front wall. An air burnout spout is arranged on the rear wall of the boiler and positioned laterally above the cyclone burner. The cyclone burner and the air burnout arrangement structure for the boiler are used for reducing unburned carbon in flue dust of the boiler and improve operating efficiency of the boiler.

The invention discloses an online low-nitrogen oxygen-rich combined combustion energy-saving system. The system comprises a pretreatment comprehensive coal hopper which is mounted on a chain-type coal firing boiler, feeds the raw coal in layers and in rows into a chain-type coal firing boiler grate and sorting powdery coal on line; a drying/preheating heat exchanger for drying and delivering the powdery coal which is sorted by the pretreatment comprehensive coal hopper and preheating the air; a coal powder fine-sorting device connected with the drying/preheating heat exchanger and used for finely sorting the powdery coal which is dried by the drying/preheating heat exchanger; and a low-nitrogen oxygen-rich coal powder combustor used for feeding the high-quality coal powder which is finelysorted by the coal powder fine-sorting device into the chain-type coal firing boiler grate. The online low-nitrogen oxygen-rich combined combustion energy-saving system has the advantages of simple structure, reasonable design and good use effect; can treat inferior coal on line to obtain the energy-saving modification technique with the optimum use effect while minimizing the minimum cost, can increase the utilization efficiency of inferior coal, reduce the waste of energy and reduce the use cost.

The invention provides a denitration system and method for cooperative high-temperature ammonia spraying of a low-nitrogen combustor of a utility boiler. The system comprises a urea solution supply system, a combustor group arranged on a utility boiler, an OFA spraying opening for introducing SOFA air, wall type spray guns and long spray guns; a secondary air pipe of the uppermost-layer combustorof the combustor groups is connected with a recirculating flue gas pipeline and an ammonia spray gun is arranged in a primary air pipeline; air is introduced into secondary air pipelines of other combustors; and the ammonia spray guns, the wall type spray guns and the long spray guns are respectively used to provide a urea solution through a connected urea solution supply system. The reducing agent coverage range is improved. The retention time of ammonia gas in a reducing atmosphere is remarkably prolonged, and the denitration efficiency can be improved. Escaped ammonia is oxidized in an SOFAair region, and the ammonia escaping level can be reduced. Water in the urea solution reacts with coke to generate OH active radicals, so that the reduction performance of flue gas in a combustor region can be improved, reactions of the ammonia gas with nitrogen oxides are promoted, and denitration efficiency is improved.

The invention discloses coal pulverizer equipment. The coal pulverizer equipment comprises a base, wherein a body support is arranged on the base, a sealed barrel with smooth and flat inner walls is connected onto the body support, all inner walls of the barrel are in smooth transition, a plurality of barrel liner plates are arranged on the inner walls of the barrel, and a mounting gap between the adjacent barrel liner plates is sealed by an inorganic material; a coal feeding pipe is arranged in the center of the top of the barrel, and a grinding roller assembly is arranged below the coal feeding pipe; a sealing air pipe is connected onto the grinding roller assembly, an air inlet is formed in the bottom of the barrel, and a pulverized coal discharge pipe is arranged at the top of the barrel and is connected with a vertically mounted separator. A local mechanism in a coal pulverizing system is changed, so that the retaining time of pulverized coal in the coal pulverizer is shortened, the safety performance of the coal pulverizing system is improved, then the temperature of hot primary air at an outlet of the coal pulverizer is increased, the hot air entering proportion is increased, the cold air entering proportion is decreased, and the purposes of reduction of carbon content of slag and improvement of boiler efficiency are achieved while the temperature of the outlet of the coal pulverizer is increased and the carbon content of fly ash of a boiler is reduced.

A center air ring concentrated type turbulent burner comprises a primary air pulverized coal pipeline, an internal secondary air duct, an external secondary air duct, an exhaust gas pipe, a deflective guide pipe, an elbow and a pulverized coal nozzle. A center air pipeline is arranged in the primary air pulverized coal pipeline, the primary air pulverized coal pipeline and the center air pipeline form an annular channel, pulverized coal is heated by high-temperature center air and internal secondary air in the annular channel and can be heated more uniformly, and therefore more volatiles can be easily separated out, and timely ignition and steady burning of the pulverized coal can be easily achieved. The pulverized coal nozzle is of a circular ring shape, the pulverized coal is surrounded by the center air, the internal secondary air and the external secondary air after being ejected out from the circular-ring-shaped nozzle, two layers of flames are formed after the pulverized coal is ignited, burning of the pulverized coal is more violent and more efficient, and the fly ash carbon content and the cinder carbon content can be effectively decreased.

The invention provides a smoke recirculation device for separating primary air and secondary air. The smoke recirculation device comprises an incinerator, a smoke purification device, a primary fan and a secondary fan. The incinerator is configured to incinerate biomass to generate smoke. The smoke purification device is configured to purify the smoke, and one part of purified smoke discharged bythe smoke purification device serves as recirculation smoke. The primary fan is configured to drain air, so that the air serves as primary air of the incinerator. The secondary fan is configured to drain air and the recirculation smoke, and the air and the recirculation smoke serve as secondary air of the incinerator. According to the provided smoke recirculation device for separating the primaryair and the secondary air, the primary fan drains the air as the primary air, the secondary fan drains the air and the recirculation smoke as the secondary air, thus the flying ash quantity and the flying ash carbon content are lowered, fuel unit consumption is lowered, high-temperature corrosion is reduced, and the combustion condition is optimized.

The invention relates to a method for improving W-type flame boiler efficiency. The method comprises steps of conducting coaly element and industrial analysis to a selected coal type, presetting a boiler combustion strategy, conducting boiler fuel combustion simulation according to the preset combustion strategy to acquire a boiler work condition, comparing and analyzing boiler work conditions upon different combustion strategies to acquire an optimal boiler grading combustion coaly proportion and coal grinding machine coal powder injection way. A proportion of the burning coal and anthracite can be well determined during the boiler grading combustion by the use of the method.

The invention relates to an efficiency-improving method for W-type flame boiler grading combustion. The efficiency-improving method comprises steps of analyzing coaly element and proximate analysis to selected coal, presetting a boiler combustion strategy, simulating boiler fuel combustion according to the preset combustion strategy to acquire a boiler work condition, and conducting comparison analysis to boiler work conditions according to different combustion strategies to acquire an optimal boiler grading combustion coal proportion and a coal injection way of a coal grinding machine. Burning coal and anthracite proportion during the boiler grading combustion process can be well determined.

The invention discloses a boiler porous pulverized coal sampling gun and a design method thereof. A sampling hole is formed in the sampling gun, a conical plug is arranged at the gun head of the sampling gun, and a positioning pointer is arranged on the outer wall of the sampling gun; a sampled pulverized coal pushing device is arranged in the sampling gun; and a pulverized coal leakage preventiondevice is arranged in the sampling hole. Through the implementation of the sampling gun, the problems that the existing single-hole pulverized coal sampling time is long and a rotary sampling systemis complex can be effectively solved. Through a porous pulverized coal sampling pipe, pulverized coal sampling can be performed representatively. The porous pulverized coal sampling pipe is simple andpractical. Pulverized coal sampling operation is simple, sampling is convenient, the sampling position does not need to be calibrated in advance, and pulverized coal sampling representativeness is high. A baffle plate is arranged at the sampling hole of the porous pulverized coal sampling gun, so that pulverized coal in the pipeline can enter the sampling gun by pushing the baffle plate through forward wind pressure. Through the arrangement of a spring, the collected pulverized coal is prevented from reversely flowing out of the sampling gun, and the effect of maintaining the sampling resultis achieved.

The embodiment of the invention provides a circulating fluidized bed boiler, and relates to the field of combustion parts of circulating fluidized bed boilers. The combustion efficiency of the boiler is improved. The circulating fluidized bed boiler comprises a boiler body and a secondary air nozzle; the secondary air nozzle is a conical pipe, the secondary air nozzle is provided with a large end and a small end which are opposite in position, the secondary air nozzle is arranged on the boiler body, and the small end of the secondary air nozzle extends into the boiler body; the secondary air nozzle comprises a first nozzle arranged at the corner of the boiler body; the center line of the first nozzle and the center line of a hearth of the boiler body form an included angle; the secondary air nozzle adopts a conical structure, so that the kinetic energy of secondary air can be increased; the first nozzle is obliquely arranged towards the center line of the hearth, abrasion of secondary air to a side wall water cooling wall tube can be prevented, meanwhile, the influence of the secondary air to wall-attached downflow can be reduced to the maximum extent, the material mixing effect is guaranteed, the boiler heat efficiency is improved, and therefore the carbon content of fly ash is reduced, the heat loss of the boiler is reduced, and the use cost is reduced.

The present invention provides a vortex combustor of coal powder circumferential compression space-sharing standing vortex, comprising a center air duct, a primary air duct, an internal secondary air duct and external secondary air duct arranged on periphery of a the center air duct from inside to outside in turn, a circumferential compression stream apparatus arranged inside secondary air duct, and a wedge-shaped circulation reflux standing vortex steady combustion body arranged at tail of the circumferential compression apparatus. After the primary air flows through the circumferential compression stream apparatus and the circumferential compression stream apparatus, the opening of the combustor forms an evident coal powder circumferential shade section and a strong standing vortex steady on-combustion section, and combustion condition of high temperature whirling current flue gas and poor-oxygen rich-fuel. Great on-combustion stabilization is provided. The invention is especially suitable for combustion of meagre coal, kilkenny coal and coarse coal, and for improving combustion flame stabilization of various coal.

The invention relates to an Undok pulverized coal gasification furnace, and particularly relates to an Undok pulverized coal gasification furnace with a steam pressurizing device for solving the problems that in the running process of an existing Undok pulverized coal gasification furnace, carbon content in combustible materials in fly ash is 20%-80%, resulting in high specific coal consumption and low carbon conversion rate of the coal gasification furnace. A cyclone separator is communicated with the gasification furnace through an inlet of the cyclone separator, two ends of a discharging channel are respectively communicated with the cyclone separator and the gasification furnace, a steam pipeline is arranged on the discharging channel, a steam nozzle is arranged in the discharging channel and installed on the steam pipeline, a spout of the steam nozzle faces an outlet of the discharging channel, a steam flow regulating valve is installed on the steam pipeline, and a descending channel pressure measuring point is arranged between the steam nozzle and the outlet of the discharging channel and installed on the discharging channel. The Undok pulverized coal gasification furnace provided by the invention is used for producing feed gas through chemical synthesis and fuel oil synthesis, industrial fuel gas, domestic gas, metallurgical reducing gas, fuel gas for combined cycle power generation, and the like.

The invention provides a fly ash circulating device and a circulating fluidized bed boiler comprising the same. The fly ash circulating device comprises a middle ash bin, a feeding machine and a pneumatic conveying device; the middle ash bin is used for containing fly ash to be circulated, an inlet of the middle ash bin is connected with a dust remover, and an outlet of the middle ash bin is connected with a coal feeding port of a hearth through a fly ash circulating pipeline; the feeding machine is arranged on the fly ash circulating pipeline and is used for supplying fly ash to the hearth from the middle ash bin; and the pneumatic conveying device is arranged on the fly ash circulating pipeline and used for conveying fly ash provided by the feeding machine into the hearth. By means of the device, the carbon content of the fly ash can be reduced, and the economic benefit and the environmental protection benefit are improved.