46results about How to "Reduce high temperature corrosion" patented technology

The invention discloses a face-fired boiler advanced denitration burning method. The method comprises the following steps: fire coal is sent to a hearth through primary air in the primary air nozzles of a plurality of turbulent burners in each of layers of turbulent burners arranged on a front wall and a rear wall and is burnt, secondary air is introduced through secondary air nozzles of the turbulent burners, over fire air is introduced through one or more layers of over fire air nozzles on the front wall and the rear wall, the primary air and the secondary air on the front wall and the rear wall are oppositely introduced, the excess air coefficient range of the main burning area of the turbulent burners is 0.5-1.05, and the fire coal undergoes low oxygen burning; the excess air coefficient range of the over fire area of the over fire air nozzles is 1.05-1.3, and oxygen rich burning is carried out; and one or more layers of an amino reduction inhibitor are injected to the hearth under the uppermost over fire layer to reduce nitrogen oxides in flue gas in high temperature environment in the hearth and inhibit generation of new nitrogen oxides. The face-fired boiler advanced denitration burning method has the advantages of substantial reduction of the nitrogen oxide discharge value of the outlet of the hearth, realization of ultralow discharge, no strict temperature window or catalyst, great reduction of the denitration cost, and prevention of high temperature corrosion of water screens in the boiler.

The invention discloses a W-firing boiler advanced denitration combustion method. The method comprises the following steps: fire coal is sent to a hearth through primary air in the primary air nozzles of a plurality of main combustors on boiler arches of a front wall and a rear wall and is combusted, secondary air and under-arch secondary air are respectively introduced through secondary air nozzles and under-arch secondary air nozzles, exhaust gas wind is introduced through exhaust gas wind nozzles on the front wall and the rear wall, one or two layers of over-fire air are introduced through over-fire air nozzles, the excess air coefficient range of a main combustion area is 0.7-1.05, and the fire coal undergoes low oxygen combustion; the excess air coefficient range of an over-fire area is 1.05-1.3, and oxygen rich combustion is carried out; and one or more layers of an amino reduction inhibitor are injected to the hearth under the uppermost over-fire air layer to reduce nitrogen oxides in flue gas and inhibit generation of new nitrogen oxides. The W-firing boiler advanced denitration combustion method has the advantages of substantial reduction of the nitrogen oxide discharge value of the outlet of the hearth, realization of ultralow discharge, no strict temperature window or catalyst, great reduction of the denitration cost, and prevention of high temperature corrosion of water screens in the boiler.

The invention discloses a boiler device adopting a cyclone combustion method, which comprises a cyclone tube, a boiler main furnace and a liquid slag granulation water tank. A primary air inlet is arranged at the front end of the cyclone tube, and a secondary air inlet is arranged in the middle of the cyclone tube. The tail of the cyclone is seamlessly connected with the main furnace of the boiler through a concave outlet; the lower tapered part of the main furnace of the boiler is a cold ash hopper, and the lower part of the cold ash hopper is arranged with a granulation water tank for granulating the boiler liquid slag discharge. The boiler device of the present invention has the following advantages: the fuel to be burned only needs to be simply crushed, which greatly saves the power consumption and cost of pulverizing; the combustion is stable; the heat intensity is high, and the boiler volume is small; the combustion efficiency is high and the economy is good; slag; ash and slag capture rate is high, fly ash content is greatly reduced; boiler size is compact; can burn a variety of fuels, fuel adaptability; boiler load adjustment capacity is large; ash slag is easy to comprehensive utilization; greatly reduce the occurrence of high temperature corrosion .

The invention relates to a semi-tower type medium-temperature separation biomass circulating fluidized bed boiler, composed of a front shaft, a middle gas-solid separating and recycled material returning unit, and a tail flue, wherein the front vertical well comprises a hearth, a convection shaft and a smoke reversing chamber; the middle gas-solid separating and recycled material returning unit comprises a gas-solid separating device, a returning riser and a returning device; a super-heater, an economizer and an air pre-heater are arranged along a smoke flowing direction in the tail flue; a lower portion of the hearth is provided with 2 to 3 layers of secondary air along a height direction; an upper portion of the hearth is provided with a convection heated surface in the convection shaft; the hearth, the convection shaft, the smoke reversing chamber, the gas-solid separating device, the returning riser and the returning device compose a main circulation loop. According to the invention, adaptability of fuels is wide; combustion efficiency is high; abrasion and corrosion for the heated surface is poor; temperature of the smoke at an inlet of the gas-solid separating device is within a range of 400-750 degrees centigrade so as to effectively prevent slagging, slag hanging, dusts gathering, ashes blocking, bed materials blocking and returning device blocking in the boiler.

The invention discloses a device and a method for reducing high-temperature corrosion of a power station boiler by use of waste heat of flue gas. The device is additionally provided with a flue gas-air heat exchanger, an indirect-type air preheater, a Roots blower, a corresponding flue gas pipeline and a corresponding air pipeline. The method has the following flow path: one part of flue gas enters the flue gas-air heat exchanger before the flue gas enters the air preheater, the other part of the flue gas enters the air preheater to heat primary air and secondary air, the flue gas exhausted from the flue gas-air heat exchanger enters a gas flue at the outlet of the air preheater, and two flows of the flue gas are mixed and enter the indirect type air preheater; the indirect type air preheater is composed of a flue gas-air heat exchanger and an air-oil heat exchanger and utilizes conduction oil as a medium to achieve heat exchange of flue gas and air; the heated air in the flue gas-air heat exchanger, used as combustion air, enters a hearth from a side wall of a boiler burner so as to ensure that an oxidizing atmosphere is formed in a side wall combustion zone, and high temperature corrosion of a water cooled wall of the side wall is reduced or alleviated.

The hot cathode spray gun comprises a cathode with a conical emission structure and an annular anode, and bent channels which are evenly distributed and used for communicating the outside with an inner cavity of the anode are formed in the anode in the circumferential direction of the anode; the invention further discloses a nano plasma spraying device which comprises the hot cathode spray gun and a loader which is detachably connected with the hot cathode spray gun and used for providing nano particle suspension liquid. The loader is provided with an injection channel which is communicated with the inner cavity and is coaxial with the inner cavity; the invention further discloses a spraying method adopting the nano plasma spraying device. The device is simple, the loader is attached to one side of the anode of the spray gun, and a plurality of suspension nozzles are distributed around the jet flow, so that the nanoparticle suspension can be efficiently injected into the high-temperature plasma, and the loader can be prevented from being frequently replaced due to damage of the anode. The spray gun anode is protected from being ablated by high-temperature plasma through a flow control method introducing the Coanda effect.

The invention relates to a method for controlling the discharge of superfine particulate matters of fire coal. The method comprises the following steps of: grinding a Mn-base desorption agent into granules of which the grain diameters are 54 to 105 micrometers, and mixing the Mn-base desorption agent with the fire coal, wherein the addition amount of the Mn-base desorption agent is 3 to 6 weight percent of the fire coal amount, and the Mn-base desorption agent is a mixture of MnO2, Mn3O4 and Mn(OH)2 or MnCO3 or MnO2, Mn3O4 and Mn(OH)2 or MnCO3; grinding the fire coal in a coal grinding machine, conveying the ground fire coal into a boiler hearth, conveying the Mn-base desorption agent into the boiler hearth with secondary air from a secondary tuyere of a boiler for combusting, and conveying air required by combustion into the boiler hearth by a forced draught blower; and allowing smoke which is formed after combustion and is mixed with the Mn-base desorption agent to enter a deduster, filtering and discharging. By the method, the high-temperature corrosion of alkali metal sodium and potassium on a boiler superheater or a boiler reheater can be reduced effectively; and harmful heavy metal elements can be removed from the smoke while particulate matters (PM) 2.5 are removed.

The invention provides a garbage incineration waste heat boiler flue gas backflow system. The system comprises an electrostatic dust remover, an electric inlet adjusting air door, a backflow fan, an outlet electric closing baffle door, a flue gas check valve, a manual shut-off valve, a flue gas pipe box and injection nozzles which are sequentially connected from a garbage incineration boiler fluegas outlet. The injection nozzles are arranged on the flue gas pipe box on a rear side wall of a boiler third flue. After flue gas on the tail portion of a boiler passes through the electrostatic dustremover, part of the clean flue gas is extracted by the backflow fan and enters the pipe box on the rear side walls of three flues of the boiler, and the flue gas is sprayed into the three flues at positive pressure at high speed to be mixed with high-temperature flue gas in the flues turbulently. The backflow flue gas is ejected into the flues in the middle of the third flue and is fully and turbulently mixed with the high-temperature flue gas, and the problems that the temperature field and the speed field of the third flue are not uniform are effectively relieved. The measured service lifeof a superheater can reach 10 years or longer, and meanwhile, the heat efficiency of the boiler is also improved.

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.