Gas heater

About: Gas heater is a research topic. Over the lifetime, 1799 publications have been published within this topic receiving 6169 citations.

Highhtemperature melting treatment

Abstract: PURPOSE:To dry, incinerate and melt high-moisture-content sludge by cumbustion of a small volume of auxiliary fuel oil and to deodorize the dry waste gas, by utiliz- ing the heat capacity of sewerage sludge for drying and melting the sludge CONSTITUTION:Sewerage sludge (dehydrated cake) (a) is dried by a dryer 10, and a gas (c) discharged from the dryer 10 is dehumidified by being passed through a cyclone 11 and a dehumidifying tower 12 And then, heat-exchange is caused to take place in a gas heater 9 between this gas and waste gas discharged from an after-combustion chamber 2 of a high-temperature melting furnace 1, and dehumidified gas (d) is heated and turned into a vapor-carrying gas (e) Major portion of this vapor-carrying gas (e) is led to the dryer 10 to be recycled for re- utilization, and at the same time, a part of surplus gas is introduced into the after- combustion chamber 2 to be deodorized by combustion

Metal Dusting of Process Gas Heater Convection Tubes

Abstract: An investigation was conducted into a failure of convection section tubes in a process gas heater in a steel-making company. Thorough study using various characterisation techniques showed that the failure of the tubes, which were made of low-alloyed steel ASTM A335 P22, was attributed to metal dusting. The attack was accelerated because of the use of incompatible tube material for the intended operating conditions. Moreover, thermal fatigue cracks were discovered on the tube surfaces. Such cracks might have been caused by the high number of plant start-ups and shutdowns. Failure contributing factors and recommendations to avoid similar failure are discussed in this article.

Thermal exploiting system and method for coalbed methane

Abstract: The invention provides a thermal exploiting system and method for coalbed methane. The thermal exploiting system for the coalbed methane comprises a set of gas injecting system and a set of gas exploiting system; the gas injecting system comprises a gas heater, a booster pump, a high-temperature steam generator, a gas mixing box, two valves, a water storage tank, a water pumping pump and a ventilating pipeline; and the gas exploiting system comprises two gas exploiting pipelines and two valves. High temperature mixed gas is injected through the gas injecting system, heat is transferred to a coalbed, so that the temperature of the coalbed is increased to 50-80 DEG C, free energy of coalbed methane is improved and acting force between molecules is destroyed, the gas absorbed in a coalbed gap and on the surface of coal is desorbed, and the coalbed methane is obtained.

Sulfur recovering method

Abstract: PURPOSE:To recover sulfur in a high yield by feeding SO2 gas and a hot gas contg. steam and oxygen to carbonaceous particles to generate hydrogen sulfide, which is then treated with Claus reaction catalyst. CONSTITUTION:Coal granules are thrown in the 1st reactor 1 with feeder 6, SO2 gas of relatively high concn. is introduced into reactor 1 from regenerator 2, and a hot gas contg. steam and oxygen is introduced into reactor 1. The hot gas moves upward while generating water gas by countercurrent contact with the coal granules. Part of the SO2 is converted into vapor sulfur by countercurrent contact with the granules, and another part reacts with the water gas to form hydrogen sulfide. This mixed gas is freed of dust in cyclone 16, scrubbed with liq. sulfur in scrubbingtower 18, and fed to vapor-liq. separator 21 to separage liq. droplets. The gas is then mixed with SO2 gas in mixer 22, heated with gas heater 24, and fed to Claus reactor 27, where it passes through Claus reaction catalyst bed 30. Vapor sulfur is condensed with condenser 35, and recovered sulfur is separated with separator 36.

Control device for coal gasification combined cycle

Abstract: PURPOSE:To eliminate a conventional air flow regulating valve, by controlling an independent air compressor for compressing a part of compressed air obtained by a gas turbine and feeding same to a gasifying furnace, according to a change in load command to be applied to a gasifying furnace controller. CONSTITUTION:A crude gas formed in a gasifying furnace 4 is refined into a fuel gas by a gas cooler 5 and a desulfurizing device, and thereafter the fuel gas is supplied through a gas heater and a fuel pressure regulating valve 8 to a combustor 9 of a gas turbine equipment A. There is provided a gasifying furnace controller 29 for controlling a coal flow regulating valve 1 and a steam flow regulating valve 3 both attached to the gasifying furnace 4 according to a load command signal. Further, a part of a high pressure air obtained by a gas turbine 11 is compressed by an independent air compressor 14, and is supplied to the gasifying furnace 4. An opening signal obtained in the gasifying furnace controller 29 is applied to a controller 30 for controlling the air compressor 14 to thereby change the revolution of the air compressor 14 in accordance with a change in load command.