4results about How to "Increase flue gas temperature" patented technology

According to the energy-saving system of the coal-fired boiler, when the boiler operates at a low load, part of steam generated during operation of the boiler is used for heating secondary air by arranging the secondary air heater, so that combustion of fuel in a hearth is stabilized, meanwhile, the temperature of flue gas at an outlet of the economizer is increased, and energy is saved. The inlet flue gas temperature of the SCR denitration device can meet the requirement of low-load commissioning; meanwhile, the steam pressure reducer and the sludge drying device are arranged, part of steam generated during operation of the boiler is extracted to be subjected to pressure reduction through the steam pressure reducer to be used for drying the sludge, the dried sludge is input into the boiler to be mixed with pulverized coal for combustion, and the coal combustion cost is saved. According to the device, through cooperative use of the equipment, secondary air can be heated when the boiler is in low load, and the combustion stability of the boiler is improved; and sludge can be blended and burnt under high load, so that the fuel cost is reduced.

The invention discloses a system and method for blending combustion of multi-element clean fuel in a coal-fired circulating fluidized bed, and belongs to the technical field of fuel combustion. Biomass is fed into the hearth from the coal feeding opening and the secondary air opening, the combustion uniformity and the combustion efficiency are improved, and the range of a reduction area is enlarged. Two layers of hydrogen feeding ports are formed in the side wall of the hearth, so that the combustion stability and uniformity are enhanced; and a hydrogen feeding port is formed in the horizontal flue, so that the temperature of tail flue gas is increased, and low-temperature corrosion is avoided. The tail flue gas recirculation is utilized to avoid overtemperature coking in a dense-phase region, and the generation of nitrogen oxides at high temperature is inhibited. Moisture in tail smoke is recycled and sent to the washing device, the moisture content in the smoke is reduced, and the problems of ash deposition, slag bonding and corrosion are solved.

The application discloses a selective catalytic reduction flue gas heating device, which comprises a flue gas transmission main line and a combustion furnace chamber, the output end of the combustion furnace chamber is inserted into the flue gas transmission main line, a furnace chamber collector and a burner are arranged in the combustion furnace chamber, a control valve is arranged at the input end of the flue gas transmission main line, a main line collector is arranged in the flue gas transmission main line, and the heating device further comprises a collection system, a data analysis system, a control module and a heater. The selective catalytic reduction injection pipe is directly connected to the obliquely-inserted combustion furnace chamber, is used for direct combustion of the burner, the high-temperature flue gas generated by combustion is mixed with the flue gas of the main line of the internal combustion engine to improve the flue gas temperature of the internal combustion engine, the prepared flue gas heating device is compact in structure, convenient to arrange, simple in preparation process, low in cost, convenient to maintain, can adjust the power of the burner according to different exhaust pipe diameters, and is high in thermal efficiency and economic benefits.

The invention discloses a smoke entrainment gas cooling device for a gas-fired boiler, and belongs to the technical field of gas-fired boilers. The device comprises a water-cooled wall, upper and lower water-cooled tube panels, left and right water-cooled tube panels and an injection chamber. According to the working principle, smoke entrainment is enhanced through the pressure difference formed by high-speed jet flow of the combustor in the injection chamber, so that high-temperature smoke flows through the water-cooled tube panels arranged on the periphery of an inlet of the injection chamber. Circulating water in the water cooling wall is used as a cooling medium to absorb heat, and the temperature of entrainment smoke can be reduced by about 20-70 DEG C, so that the flame temperature of a combustion area is reduced, and the generation of NOx is remarkably reduced. The device is simple in structure and easy to install and overhaul, emission is reduced, meanwhile, the working environment of the burner can be effectively improved, and the service life of the burner is prolonged.