39results about How to "Reduce low temperature corrosion" patented technology

The invention relates to a circulating fluidized bed boiler unit for high efficiency combustion of biomass and recovery of waste heat. The circulating fluidized bed boiler unit comprises a hearth, a tail flue and a secondary air distribution system and is characterized in that the tail flue is provided with three tandem parallel channels, i.e., a first tail flue, a second tail flue and a third tail flue , an inlet of the first tail flue is connected with a horizontal flue outlet of a cyclone separator, the outlet steers 180 DEG and is then connected with an inlet of the second tail flue, an outlet of the second tail flue steers 180 DEG and is then connected with an inlet of the third tail flue, a heating surface is arranged in the tail flue, a coarse-pitch tipping-tube medium-temperature superheater is arranged in the first tail flue, the secondary air distribution system is an air distribution structure with upper-lower and horizontally left-right staggered junction formed by air distribution units staggerly arranged at the lower part, the waist part and the central part of the front and rear walls of the hearth, and the air distribution structure enables multiple layers of secondary air jet to be mutually crosswise sprayed into the hearth in a height direction and a horizontal direction. The boiler unit provided by the invention has high combustion efficiency, discharges a small amount of CO, reduces fly ash content in flue gas and guarantees that main steam parameters accord with design requirements.

The invention discloses an exhaust gas waste heat recovery and emission reduction comprehensive application system for a coal-fired boiler in a thermal power plant. In the invention, along the flow direction of flue gas, an air preheater, a first low temperature economizer, a low temperature dust collector, a draught fan, a second low temperature economizer and a desulfuration island are sequentially arranged on a pipe between the boiler and a chimney, wherein, the inlet of the air preheater is respectively communicated with a cold primary air pipe and a cold secondary air pipe; the cold secondary air pipe is provided with a secondary air heater; the secondary air heater is communicated with the second low temperature economizer via a coal-water pipe; the coal-water pipe is provided with an expansion tank and a water pump; and the low temperature economizer is divided into two segments, wherein, one segment is used for heating condensed water, and the other section is used for heating the cold secondary air at the inlet of the air preheater by virtue of a water medium. The exhaust gas waste heat recovery and emission reduction comprehensive application system has the beneficial effects of maximally utilizing the gas waste heat, reducing heat consumption of a machine set, lowering energy consumption of equipment such as the dust collector, the draught fan, a blower and the like, reducing the power consumption rate of the thermal power plant, improving the economical efficiency of the thermal power plant, more efficiently saving the energy consumption, and benefiting construction of the lowcarbon society.

The invention discloses a medium-speed coal mill with a deashing desulfurizing device, comprising a coal feeding pipe, a conical shell, a coarse powder separator retainer, a grinding ring and the deashing desulfurizing device.The conical shell is disposed outside the coal feeding pipe.The coarse powder separator retainer is disposed at the top of the conical shell.The grinding ring is disposed below the conical shell.The deashing desulfurizing device comprises am impurity separating module, an impurity discharge pipe and an impurity sensing module; the impurity separating module is disposed at the bottom of the conical shell of the medium-speed coal mill, the impurity sensing module is disposed outside the medium-speed coal mill, and the impurity separating module and the impurity sensing module are communicated through the impurity discharge pipe.The medium-speed coal mill with the deashing desulfurizing device has the advantages that output of the coal mill is increased, power consumption per unit powder production is reduced, equipment abrasion is reduced, water-cooled wall high-temperature corrosion and lagging tendency is reduced, low-temperature corrosion of boiler tail heated surface is reduced, sulfur emission of power plants is reduced and running cost of a desulfurizing system is reduced; the removed impurity is recyclable, and benefit can be maximized.

Disclosed is a membrane water-wall compound return water condensing type natural gas hot water boiler. The natural gas hot water boiler is characterized in that a gas collector is connected with a primary pipe network water supply pipe (21) in pipelines; return water of a primary pipe network return water pipe (20) in the pipelines sequentially passes a lower water header, a lower header, a first heat exchanging pipe, an upper header and an upper water header of an economizer and a rear-membrane type water wall, a mid-partition membrane type water wall, a left-membrane type water wall, a front-membrane type water wall and a convection bank of a hearth (5) to be finally converged in an upper boiler barrel; the pipelines further include a secondary network water return pipe (22) and a secondary pipe network water supply pipe (23), and return water of the secondary pipe network return water pipe sequentially passes a branched water header (31), a second heat exchanging pipe (32) and a water header (33) of a condenser; one end of the water header is connected with the secondary pipe network water supply pipe while the other end is plugged. The membrane water-wall compound return water condensing type natural gas hot water boiler has certain universality, heat utilization rate of the boiler is increased, fuel cost during operation is lowered, and service life of boiler equipment is prolonged.

The invention discloses a waste heat recovery system and method with discharged smoke waste heat as a heat source of an air heater. According to the waste heat recovery system and method with the discharged smoke waste heat as the heat source of the air heater, a low-temperature economizer and the air heater are connected through a pipeline to form a first circulation loop, a circulating pump is arranged on an inlet pipeline of the low-temperature economizer, and an air heater intake water regulating valve is arranged on an inlet pipeline of the air heater; and the low-temperature economizer is connected with the circulating water side of a condensed water heater through a pipeline to form a second circulation loop, the condensed water side of the condensed water heater is connected with a low-pressure heater in parallel through a pipeline, and a booster pump is arranged on a condensed water connecting pipeline between the condensed water side of the condensed water heater and the low-pressure heater. The system and method have the advantages that the air heater is reserved, low-temperature corrosion of an air preheater is relieved, the low-temperature economizer recovers discharged smoke waste heat of a boiler, and power generation coal consumption of a steam turbine is reduced; and meanwhile, the defects that since the air heater consumes low-pressure suction steam of the steam turbine, the heat consumption of the steam turbine is increased, the temperature of discharged smoke is increased, and the heat efficiency of the boiler is reduced are overcome, and the problems that a low-temperature economizer pipeline system is high in cost and operating reliability requirement are solved.