127results about How to "Prevent high temperature corrosion" patented technology

The invention discloses a near-wall air device for preventing the high-temperature corrosion of the water-cooled wall of a power station boiler, which comprises an air duct, a regulating valve, a near-wall air box, near-wall air unit nozzles, a fuel component on-line monitor and a speed measuring device, wherein the direction of the near-wall air is parallel to the axis of a pipe of the water-cooled wall, the resistance along the course is small and the air speed reduction is slow; only one layer of near-wall air nozzles is required to be arranged in a burner area and the system structure is simple; and the nozzles are flexibly arranged, the nozzle cooling condition is good, the operational air volume is small and the stability is high. Thus, the device is suitable to be promoted for preventing the high-pressure corrosion of the water-cooled walls of power station boilers.

The invention provides a combined-type thermal-oxidation igniting process nozzle for gasifying solid powder fuel. The combined-type thermal-oxidation igniting process nozzle for gasifying the solid powder fuel is characterized by comprising a central passage, a thermal-oxidation spray gun fuel passage circularly shaped is uniformly arranged outside the central passage, a side gasifying agent inlet is reserved on the outer wall of the thermal-oxidation spray gun fuel passage, a thermal-oxidation spray gun burner is arranged inside the thermal-oxidation spray gun fuel passage, and a gasifying agent spraying nozzle is arranged on the head portion of the thermal-oxidation spray gun burner. An outer metal wall of a thermal-oxidation passage coaxial with the central passage is arranged outside the thermal-oxidation spray gun fuel passage, an inner metal wall of a cooling jacket is coaxially arranged outside of the outer metal wall of the thermal-oxidation passage, and an outer metal wall of the cooling jacket is coaxially arranged outside the inner metal wall of the cooling jacket via a middle tube wall of the cooling jacket. By the aid of the combined-type thermal-oxidation igniting process nozzle for gasifying the solid powder fuel, defects in the prior art are overcome, a start working nozzle and the process nozzle are integrated, and the whole igniting process of a gasification furnace is simplified. The combined-type thermal-oxidation igniting process nozzle for gasifying the solid powder fuel has the advantages of multiple functions, wide applications, long service life and the like.

The invention discloses an ascending pipe heat exchange device for the raw gas of a coke oven, and belongs to the technical field of recycling utilization of raw gas afterheat. The ascending pipe heat exchange device for the raw gas of the coke oven comprises a flue gas inlet flange arranged at the lower end of the ascending pipe heat exchange device, a flue gas outlet flange arranged at the upper end of the ascending pipe heat exchange device, an inner barrel, a middle barrel and an outer barrel, wherein an inner sandwich layer is formed between the inner barrel and the middle barrel, desalted water or nitrogen or air is fed into the inner sandwich layer, and an outer sandwich layer is formed between the middle barrel and the outer barrel and is a closed thermal insulating layer. The ascending pipe heat exchange device can be used for ensuring a heat exchange effect, effectively, safely and reliably recycling the raw gas afterheat, ensuring the safe and economic operation of the coke oven and a heat exchanger under severe working conditions and meanwhile solving the problem of narrow adaptation of a conventional heat exchanger in starting and stopping processes.

The present invention is one W-shaped flame furnace with dense and dilute coal powder combustion and relates to one kind of burning plant. The improved W-shaped flame furnace includes furnace arch, side wall, hearth formed with the furnace arch and the side wall, and burner. The burner includes dense coal powder flow flame nozzle in the center of the hearth and dilute coal powder flow flame nozzle near the side wall. The present invention has greatly raised ash melting temperature to avoid slagging of the water cooled wall and prevent high temperature corrosion while reaching the aims of timely igniting and stable combustion.

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 provides a method for producing white carbon black and active carbon by using residual rice hull ash after gasification, which comprises the following steps of: performing alkali solution impregnation, drying and roasting on the residual rice hull ash after the gasification, which serves as a raw material, to obtain a mixture of powdery water glass and carbon powder; adding water into the mixture to dissolve the mixture and boiling the mixture to obtain a water glass solution and the carbon powder; performing the reaction of the water glass solution and soluble alkali metal acid carbonate to obtain silicon dioxide hydrate; filtering the silicon dioxide hydrate; washing and drying a precipitate to obtain the white carbon black; and washing and activating filter residue of the carbon powder to obtain the active carbon, wherein an alkali solution can be recycled. In the method, silicon dioxide in raw materials can well react with alkali, the impregnating absorption performance is good, the uniform permeation is achieved quickly, and the drying link can be switched immediately, so that the large silo capacity for storing impregnated rice hull ash is unnecessary; the anoxic roasting temperature is low, so that the high-temperature corrosion of a furnace body is avoided; the alkali solution can be recycled, so that the loss of chemical raw materials is reduced; the intermediate product powder, which is the mixture of the water glass and the carbon powder, is easy to be separated and filtered; and a prepared white carbon black product is high in purity and strong in activity.

The invention relates to an intelligent water wall high temperature corrosion preventing system suitable for a large power station boiler and a method. The system can be adjusted in real time according to the change of the operating conditions of the boiler to prevent a water wall from high temperature corrosion, operating personnel involvement is not needed, and the high temperature corrosion is intelligently prevented. The system comprises a pressurizing pipeline communicated with an air pre-heater outlet hot secondary air box, a booster fan is arranged on the pressurizing pipeline and is communicated with an annular air box of surrounding a protection wall, the annular air box is communicated with branch air boxes through connecting air boxes, and the branch air boxes are communicated with ventilation grooves in the boiler wall. An air flow adjusting device is arranged on the pressurizing pipeline, and the air flow adjusting device comprises an isolation baffle, a master adjusting baffle, an air flow measuring device and a pressure sensor and further comprises a branch adjusting baffle of the connecting air boxes. An intelligent control system adjusts the opening and closing degree of each baffle in the air flow adjusting device according to the operating state of the boiler, and the air flow is controlled to prevent the water wall from the high temperature corrosion.

The invention discloses an adherence air device for preventing high-temperature corrosion of a water cooling wall of a refuse burning boiler. The adherence air device comprises an adherence air box and an adherence air nozzle, wherein one end of the adherence air box is connected with the adherence air nozzle; the other end of the adherence air box is connected with an air pipe; the adherence air nozzle comprises a nozzle fin, a front baffle, a bottom baffle, a water cooling wall pipe and a water cooling wall fin; the front baffle is composed of an inlet baffle, a reducing baffle and an outlet baffle; a blowing slit is formed on the outlet baffle; and a water cooling wall slit is formed by taking down the water cooling wall fin between two corresponding adjacent water cooling wall pipes. The adherence air nozzle adopts a reducing design, smoke is sprayed out from one side of a main smoke direction, and the adherence air direction is the same as the axial direction of the water cooling wall pipe; and with an injection area, the device realizes stable and reliable formation, little flow resistance, long conveying distance and large protection range. The device does not need multi-layer arrangement, causes little influence on the burning heat transfer of the original boiler, and effectively solves the problem of high-temperature corrosion of the water cooling wall of the refuse burning boiler.

The invention discloses a wall-attached air system for preventing high temperature corrosion of a water cooled wall of a garbage incinerator. A wall-attached air supply device comprises a chimney, a slag pump, a controllable heat exchanger, an air pipe and an air duct which are connected in sequence through pipelines. Necking devices are wall-attached air bellows symmetrically arranged on the inner front wall and the inner rear wall of a first flue; the corresponding surfaces of the two wall-attached air bellows are streamline-type curved surfaces; the arc line of the lower curved surface of the streamline-type curved surfaces and the wall surfaces of the front wall and the rear wall are in smooth transition; the included angle between the air outlet angles of the air outlets of the wall-attached air bellows relative to the wall surfaces of the front wall and the rear wall is 170-175 DEG; and air blown by the air outlets forms an airstream layer along the inner wall surfaces of the front wall and the rear wall and ascends along the water cooled wall, so that the oxidizing atmosphere is guaranteed, the temperature of areas near the water cooled wall is relatively reduced, and the high temperature corrosion is prevented. The streamline-type curved surfaces of the wall-attached air bellows can reduce wear of unburned particles on the water cooled wall and prevent combustion of the unburned particles in the positions close to the wall.

Provided is a boiler water wall air film protection device. A plurality of tuyeres are arranged obliquely in an upstream boiler wall of high-temperature flame and flue gas coal dust airflow in the boiler water wall area and each tuyere communicate with an air flue arranged on the outer side of a hearth. Air is jetted into the hearth through the tuyeres, airflow forms an air curtain between the downstream portion of the flame and high-temperature flue gas flow and a water wall along the flue gas and the air curtain is towards the water wall under pushing of the flame and the high-temperature flue gas to form an air isolation layer, on the one hand, the action of the air curtain can push the wall-eroding coal dust airflow or flame to the center of the cross section of the hearth, so that erosive wear and corrosion to the water wall from the wall-eroding coal dust airflow or flame are avoided, and on the other hand, the air curtain is turned to the downstream water wall area under the action of the upstream high-temperature flame and flue gas, a layer of oxidizing atmosphere protection film is formed on the downstream water wall area, and the problem of high-temperature corrosion of the water wall is solved fundamentally.

Disclosed is a secondary air offset whirl pulverized coal burner for a W flame boiler. The problems of high NOx discharge amount, high fly ash combustible matter content, slag-bonding to water walls of front and back walls of a lower combustion chamber and high temperature corrosion of the W flame boiler which is provided with an existing whirl pulverized coal burner on an arch are solved. A circular ring inner secondary air stop block in the circumferential direction is added in inner secondary air on a dividing cylinder of primary air and inner secondary air of the whirl pulverized coal burner; the angle of the circular ring inner secondary air stop block in the circumferential direction is 180 degrees; a circular ring outer secondary air stop block in the circumferential direction is added in outer secondary air on a dividing cylinder of the inner secondary air and the outer secondary air; the angle of the circular ring outer secondary air stop block in the circumferential direction is 180 degrees; the boundary line in the diameter direction of the circular ring inner secondary air stop block and the circular ring outer secondary air stop block is parallel to the front and back walls of the boiler; the circular ring inner secondary air stop block and the circular ring outer secondary air stop block are mounted on one side close to the center of a combustion chamber. The secondary air offset whirl pulverized coal burner is used for the W flame boiler.

The invention belongs to the technical field of metal surface spray and provides a method for spraying and preparing a high temperature sulfidation resistant alloy layer on the surface of cast iron. The method includes the following steps of: (1) pre-treating the surface of a cast iron workpiece before spraying, and exposing the clean and coarsening metal surface of the workpiece; (2) adopting a subsonic speed oxyacetylene flame hot spray method to spray prime coat on the surface of the cast iron workpiece, wherein the prime coat adopts nickel aluminum compound powder; and (3) adopting a high speed arc wire spray method to spray an FeCrAl working layer on the surface of the cast iron workpiece. The technique of the invention is characterized by simple and convenient operation and strong applicability, can save high alloy material and is convenient for promotion and use. Compared with the overall high temperature sulfidation resistant material, the cast iron part prepared by means of the method is low in cost, has excellent resistance to high temperature sulfidation and favorable wearing resistance, and can strikingly improve the service life of the cast iron part in a high temperature sulfidation environment.

The invention relates to waste incineration boilers used for power generation and steam supply, in particular to a high-parameter waste incineration boiler with a reheating function. According to the high-parameter waste incineration boiler with the reheating function, the heat efficiency of the boiler and the overall power generation efficiency of a power plant can be effectively improved, so that the economic benefits of the power plant are greatly increased. The high-parameter waste incineration boiler comprises a hearth. The hearth sequentially communicates with a first perpendicular channel, two perpendicular reburning chambers, a horizontal flue and tail perpendicular flues. A reheater, a high-temperature superheater, a medium-temperature superheater and a low-temperature superheater are sequentially arranged in the horizontal flue. The reheater is provided with a spraying coating or is made of an anti-corrosion material. The tail perpendicular flues are each internally provided with coal economizers.

The invention relates to a vertical single-drum refuse-incinerating waste heat boiler, mainly comprising a high-temperature smoke inlet, a front cooling chamber, a rear cooling chamber, a vertical well flue, a super-heater, a tube box type economizer and a drum; the boiler provided by the invention utilizes a diaphragm type water-cooling wall smoke cooling chamber, a diaphragm type water-cooling wall enclosure vertical-well flue, and a steel tube box type economizer; all smoke channels are in sealed welding structures; sealing property of the boiler is high to ensure that airs do not leak out from the boiler, and harmful gas in smoke does not leak. Because the smoke cooling chamber is arranged in front of the super-heater, high-temperature smoke passes through the cooling chamber at first, and then flows into the super-heater so as to reduce temperature of inlet smoke of the super-heater, and prevent the super-heater from high temperature corrosion by chlorine-containing gas generated by burning refuses.

The invention relates to a system and a method for fluidized bed gas production, gas-based reduction and electric steelmaking coupling. The system comprises a fluidized bed, a gas-based reduction device and an electric furnace, wherein the fluidized bed comprises an air distribution plate, a gas blowing hole, a fluidized bed material cabin and a coal gas outlet; the gas-based reduction device comprises a vertical furnace and a iron tank which are connected with each other; the vertical furnace comprises a coal gas inlet and an oxidized block cabin; the coal gas inlet is connected with the coal gas outlet; the iron tank comprises a reduced iron outlet; the electric furnace comprises a reduced iron inlet, an electric furnace cabin and a steel outlet; and the electric furnace reduced iron inlet is connected with the reduced iron outlet of the iron tank. Through coupling processes of fluidized bed gas production-direct gas-based reduction-electric steelmaking coupling, the process of cooling, washing, dust collection and further heating of a coal gas produced by using the fluidized bed is avoided, system investment is reduced, sensible heat of the coal gas is sufficiently utilized, energy consumption of coal gas heating of the vertical furnace is reduced, relatively optimal parameters are screened, the complete-flow optimal process is explored, and optimal coupling of production parameters of equipment is achieved.

A low-oil-consumption ignition swirling pulverized coal burning device relates to a pulverized coal burning device. The invention aims to solve the problems of large oil consumption, energy waste, and high pollutant discharge of a coal-fired boiler existing in the burning device in the coal-fired boiler of power plants. An inlet end of an inner wall swirling wind cover (3-1) in the invention is connected with an outlet end of an external pipe (2-7), a passage exit in a duct (3-8) is respectively connected with the inner wall swirling wind cover (3-1), a swirling outer secondary wind cover (3-4) and a direct secondary wind cover (3-9), and the passage exist in the duct (3-8) is respectively provided with an air volume regulation plate (3-7). The invention has the advantage of reasonable structure, design and arrangement. The invention burns pulverized coal by using a small amount of oil, oil and gas, natural gas or coal gas, which can save ignition energy, and reduces the discharge of pollutant. The device of the invention has higher safety and reliability properties, which can save 40%-90% fuel oil compared with the prior art.