37results about How to "Reduce thermal deviation" patented technology

The invention discloses an eastern-Junggar-coal fired double-reheat steam power plant boiler, and relates to a double-reheat steam power plant boiler which can be used by a thermal power station for a long time, and is safe, economical, and completely eastern-Junggar-coal fired. A tail flue is divided into a front flue, a middle flue and a rear flue by division walls, and the three flues all adopt structural supports; an ejector primary hot wind regulation baffle opens when the boiler is at middle or lower load, and the opening of the ejector primary hot wind regulation baffle is controlled to enable double reheat steam temperature to be kept at a rated value in the range of 40% to 100% BMCR; sequence and quantity of temperature-regulation air-flue ejectors along the width direction of the boiler are changed, so that thermal deviations of high-temperature heating surfaces along the width direction of the boiler can be compensated and reduced; a strong directional supersonic steam flow soot blower system is arranged on the ceiling, DCS controls continuous soot blowing time and interval time of each supersonic steam flow nozzle set, and thereby the thermal deviation of each high-temperature heating surface can be further compensated; the low thermal deviations effectively relieve the growing process of an oxide skin on the inner side of each high-temperature heating surface, so that operational reliability is significantly improved.

The invention claims a parameter optimization ultra-supercritical secondary reheating power station boiler and relates to an ultra-supercritical secondary reheating power station boiler which is efficient, safe and low in emission and low in cost and is matched with a parameter optimization ultra-supercritical secondary reheating turboset for a fire coal thermal power station. The main steam inlet parameter optimization at the boiler side is 35.7MPa at 590 DEG C; the primary reheating steam parameter optimization is 8.9MPa at 623 DEG C; the secondary reheating steam parameter optimization is 1.52MPa at 538 DEG C; the water giving temperature optimization is 303 DEG C; a tail smoke channel is divided into a front smoke channel, a middle smoke channel and a rear smoke channel through division walls; the ejector heat primary air damper is arranged in the boiler and is started at low load; the opening degree of the ejector heat primary air damper is controlled and the using number is controlled for maintaining the primary reheating temperature at rated value in the range of 40% to 100% BMCR; the adding times and the using number of the temperature adjusting wind-smoke ejector along the furnace width direction are changed for compensating and reducing heat deviation along the furnace width direction for the heating surface.

The invention discloses a supercritical carbon dioxide coal-fired circulating fluidized bed boiler, a power generation system and a power generation method. The supercritical carbon dioxide coal-firedcirculating fluidized bed boiler comprises a hearth, a separator, a tail flue and an externally-arranged type heat exchanger located in a material back section of the separator. A cooling wall and anintermediate-temperature overheater are arranged in the hearth. A high-temperature reheater and a low-temperature overheater are arranged in the externally-arranged type heat exchanger, wherein the low-temperature overheater communicates with the cooling wall and the intermediate-temperature overheater. A low-temperature reheater, a high-temperature overheater, an upper-level economizer, a lower-level economizer and an air preheater are arranged in the tail flue, wherein the high-temperature overheater communicates with the intermediate-temperature overheater, the low-temperature reheater communicates with the high-temperature reheater. The working medium of the boiler is supercritical carbon dioxide. By the adoption of the supercritical carbon dioxide coal-fired circulating fluidized bedboiler, the wall temperature of the cooing wall can be effectively controlled, it is guaranteed that the boiler safely and reliably operates, and the heat efficiency is high; a power generator set tends to be miniature, a higher load response speed is obtained, the deep peak load regulation adaptability is high, the advantages of coal resources are taken into full play, the energy utilization rate is improved, and energy safety is guaranteed.

The invention provides a water circulation structure of a fuel gas corner tube hot-water boiler. Rising flow is completely forced by a heat-absorbing face and possible tube burst accidents caused by hydraulic working condition deterioration such as subcooled boiling, stagnating and backflow are avoided. A boiler body is of a frame-type self-supporting structure composed of large-diameter steel tubes arranged on the four corners, an upper collecting box, a lower collecting box, a longitudinal collecting box and a transverse collecting box; the water circulation structure is composed of a water cooling wall of a front wall of a furnace hearth, a water cooling wall of a rear wall of the furnace hearth, a membrane-type water cooling wall heat-absorbing face of a side wall I, a membrane-type water cooling wall heat-absorbing face of a side wall II, a membrane-type water cooling wall heat-absorbing face of a side wall III, a conversion shaft membrane-type water cooling wall heat-absorbing face, a flag-type heat-absorbing face, a collection box and connection pipes between the water cooling wall of the front wall of the furnace hearth, the water cooling wall of the rear wall of the furnace hearth, the membrane-type water cooling wall heat-absorbing face of the side wall I, the membrane-type water cooling wall heat-absorbing face of the side wall II, the membrane-type water cooling wall heat-absorbing face of the side wall III, the conversion shaft membrane-type water cooling wall heat-absorbing face, the flag-type heat-absorbing face and the collection box. The flag-type heat-absorbing face which does not penetrate through the walls is directly welded to the densely-arranged membrane-type water cooling wall of the rear wall, so that the transverse pitches of tube bundles are reduced and reasonable smoke flow speed is guaranteed; two side walls are divided into three levels of heat-absorbing faces according to different heat loads, so that heat deviation and flow deviation in the water tubes are greatly reduced. The boiler body is composed of the full-membrane-type water cooling walls, the conversion tube bundles do not penetrate through the walls, the air-tightness is good, the air leakage amount is small, the burning efficiency is high, and the water circulation structure can safely and efficiently operate for a long time under various loads.

The invention discloses a natural gas condensing boiler system and a method thereof for catalytic oxidation of fuel-rich combustion. A combustor is successively connected with a fuel-rich combustion chamber, a second return flue pipe and a third return flue pipe to form three flue gas return paths. An excess air coefficient maintained in the fuel-rich combustion chamber is less than 1. 0, an unburnt gas catalytic oxidation device is arranged on the third return flue pipe, and flue gas passes through the three flue gas return paths and is connected with a chimney by passing through an energy saver and a condenser successively. According to the natural gas condensing boiler system, rapid combustion in a reducing atmosphere is achieved, and almost no NO<x> is generated by low-temperature oxidation in the unburnt gas catalytic oxidation device, thus the NO<x> emission level can be strictly controlled, and environmental pollution is reduced; according to the natural gas condensing boiler system and the method thereof for catalytic oxidation of fuel-rich combustion, NO<x> emission can be effectively decreased, meanwhile, the alteration cost is saved, and the heat is recycled; and the system has a wide application range, and is suitable for various heating condensing boilers.

The invention provides an octagonal circulating fluidized bed boiler with multiple separators. The octagonal circulating fluidized bed boiler comprises a hearth, the first cyclone separator and the second cyclone separator, wherein the cross section of the hearth is octagonal; the hearth is composed of a front wall, a back wall, a left side wall, a right side wall and four membrane walls, and an angle beta is formed between each side wall and the corresponding membrane wall on the cross section; the cross section of the hearth is provided with a hearth front and back wall center line and a hearth left and right side wall center line and is axisymmetrical with respect to the two center lines; the first cyclone separator and the second cyclone separator are arranged on the back wall of the hearth; the tube structure and the size of the first cyclone separator are the same as those of the second cyclone separator; the inlet flue duct cross section of the first cyclone separator and the inlet flue duct cross section of the second cyclone separator are symmetrical with respect to the hearth front and back wall center line; in the tangential edges and the bevel edges of the inlet flue duct cross sections of the first cyclone separator and the second cyclone separator, the tangential edges are closer to the hearth front and back wall center line; the angle formed between the inner wall of the tangential edge of the inlet flue duct cross section of each cyclone separator and the back wall of the hearth is 90-110 degrees; and in addition, the position of an inlet flue duct of the first cyclone separator and the position of an inlet flue duct of the second cyclone separator both meet the following formula that AB=BC-(0.1-0.5)CD*cot beta.

The invention relates to a biomass circulating fluidized bed boiler. The biomass circulating fluidized bed boiler comprises a hearth with a rectangular section and is characterized in that a water wall is arranged on the outer side wall of the hearth, and the water wall is arranged on the side wall of the hearth in a covering mode; an air supply air channel is fixedly installed on the hearth, theair supply air channel communicates with the interior of the hearth, and the air supply air channel comprises a primary air supply air channel and a second air supply air channel; and the second air supply air channel comprises a secondary air mother pipe, a first-stage air channel with an annular structure and a second-stage air channel with an annular structure, the first-stage air channel and the second-stage air channel are arranged on the side wall of the hearth in a covering mode, the first-stage air channel is located below the second-stage air channel, wherein the first-stage air channel and the second-stage air channel communicate with the secondary air mother pipe. According to the biomass circulating fluidized bed boiler, by additionally arranged the first-stage air channel andthe second-stage air channel, generation of nitrogen oxides during biomass burning is reduced, sufficient burning is promoted to reduce the accumulation of ashes, and a fly ash phenomenon is prevented.

The invention provides a rotary air preheater with hierarchical reverse rotation, relating to equipment of heating cold air by using low temperature hot gas. The rotary air preheater comprises a shell, at least two stages of rotors, a bearing, a gas channel and an air channel. The multiple stages of rotors are arranged in series. A reverse transmission device is arranged between the rotation shafts of two adjacent stages of rotors, the rotation directions of two adjacent stages of rotors are opposite, radial sealing pieces are arranged at the junctions of adjacent channels between the two adjacent stages of rotors, and circumferential sealing pieces are arranged at rotor and shell gaps between the two adjacent stages of rotors. Through different rotation directions of front and back stages of rotors, a rotor hot storage piece which is cooled by air is alternatively heated by two side gas in an air preheater channel, the deviation of boiler flue gas discharge temperature is reduced, thus the early entering of a part of gas in the air preheater channel into a dew point area is avoided, the problems of cold end heat storage piece condensation, dust touch, corrosion, clogging and the like are reduced, the boiler gas discharge temperature is reduced, and the boiler efficiency is improved.

The invention discloses a rapid production method of a bow-shaped water tube boiler. The rapid production method of the bow-shaped water tube boiler comprises the following steps that angles of biomass gasification gas nozzles are determined, aiming at all fuel, all combustion working conditions, the corresponding upward-swing angle values of the biomass gasification gas nozzles are set, the upward-swing angle values of at least two biomass gasification gas nozzles are different of each other, a boiler combustion adjusting test is conducted according to all the fuels and the corresponding upward-swing angle values of all the biomass gasification gas nozzles, and the thermal deviation of the left side and the right side of a reheater and the temperature deviation of reheat steam are detected. According to the rapid production method of the bow-shaped water tube boiler, the thermal deviation of the left side and the right side of the reheater of the pulverized coal boiler and the temperature deviation of the steam of the reheater can be effectively reduced, the average temperature of the reheat steam is improved, the operation efficiency and economy of a unit are improved, meanwhile,local metal over-temperature of the reheater is prevented, the frequency of boiler tube bursting is reduced, and the operation safety of the boiler is improved.