Hot Air Stove

When the dextrin is to be solidified, the boiling sirup is poured into small, shallow tin vessels, placed upon a hot air stove, maintained at a temperature of from 100° to 120°. At the end of twenty-four hours the gum acquires the consistency of jujube paste, and it is then out up, with a pair of shears, into small oblong pieces, which are rolled out upon a polished surface, with a wooden cylinder dusted with pulverised artificial gum and afterwards placed upon wooden frames, where It is allowed to remain drying for three or four days. Thomas suggests that the gum would be much better desiccated by permitting it to run upon a cylinder heated to 230° or 250°, but he adds that the economy of this method is questionable. 

Key words Blast furnace Hot air stove Refractory Hot air channel Abstract... 

The serviee behavior of refractories used in hot air pipeline for hot air stoves in a 3200 M3 blast furnace of WISCO was analyzed. The damage faetors ean be concluded as the poor quality of andalusite based bricks, the severe thermal shoek damage, the more porosity in structures, loose bonding capability, and the unreasonable ehoiee of materials and design of bricks. By analysis, the service life of hot air stoves ean be enhaneed by the measurements such as the reasonable ehoiee of materials and their mateh, the use of light-weight refractories, the improvement of brick type, etc. Thereafter, the normal produehon operahon of hot air stoves is guaranteed. 

The wear reasons of main pipelines in hot air stove are poor thermal damage resistance, loose structure and small wedge degree of corundum-mullite based bricks in working layer, leading to the deformation, rupture and brick drop. 

Heat recovery tor steam generation, pre-heating combustion air, and high efficiency burners Adjustable speed drives, heat recovery coke oven gases, and dry coke quenching Efficient hot blast stove operation, waste heat recovery for hot blast stove, top gas power recovery turbines, direct coal injection... 

Once the energy - in many cases, heat - is generated, it must be transmitted to the fuel (the "touching" of the fuel and energy legs). This process is accomplished in three ways conduction (die transfer of heat through a medium, such as a pan on a stove s heating element), convection (the transfer of heat with a medium, such as the heated air in a hot-air furnace), and radiation (the transfer of heat which is not dependent on any medium). 

Air required for combustion is furnished by turboblowers and preheated in hot-blast stoves lined with refractory-brick checker-work. Commonly,... 

Drying the product to the final moisture content is known as stoving . This is a very simple method in which the starch trays are placed in a heated chamber and hot air is blown over the sweets. The rate at which a given product can be stoved is determined by the following factors the size of the sweet the viscosity of the sweet and the maximum temperature that can be used without damaging the product the rate at which the sweet can be dried is ultimately diffusion limited, i.e. it is limited by the rate at which water can move from the middle of the sweet to the surface. 

The increase in efficiency resulting from reheating is greater with tools that use air expansively than with machines taking in air for full stroke. Sometimes it is not desirable to have the air entering a tool at a temperature above 300 , because of the effect of this high temperature on the lubrication. For these conditions small portable hot-water stove-type reheaters are available in capacities of from 62 to 800 cu. ft. of air per minute. 

These short hydrocarbon chains have low boiling points, so they evaporate and burn easily. That makes methane a good fuel for your stove or furnace. Propane is used in gas grills, lanterns, and to heat air in hot-air balloons. Butane often is used as a fuel for camp stoves and lighters. Longer hydrocarbons are found in oils and waxes. Carbon can form long chains that contain hundreds or even thousands of carbon atoms. These extremely long chains make up many of the plastics that you use. 

Conventional Dipping. In conventional dipping the workpieces are immersed in the paint and then removed (Fig. 8.2). The liquid paint adheres to the surface and is then dried or stoved. Care should be taken to ensure that the workpieces do not float during dipping and that air bubbles do not become trapped. The speed at which the workpiece is removed from the bath must be selected so that excess paint adhering to the surface can run off The draining and evaporation time must be sufficiently long to ensure satisfactory evaporation of the solvents (if necessary a hot air zone should be included for waterborne paints). 

Operational data were obtained from a foundry in France, operating a stove with a capacity of 540 cold-box cores, which is heated with a natural gas burner. Two ventilators are used to evacuate the fumes and to mix the fresh air. The design temperature of the hot air is 165 C. A heat balance was set-up on the basis of measurements using 0.4 kg cores with a humidity of 5.5 %. The balance, as given in Figure 4.7, applies for a throughput of 390 cores, which is equivalent to 72 % of lull capacity. 

Bustle Pipe or Hot-blast Circulating Duct. A metal tube of large diameter which surrounds a blast furnace at a level a little above the tuyeres it is lined with refractory material and distributes the hot air from the hot-blast-stoves to the pipes known as... 

Hot-blast Main. A duct, lined with refractory material, through which hot air passes from a hot-blast stove (q.v.) to the bustle pipe (q.v.) of a blast furnace. 

The No.7 blast furnace of WISCO has been used for about 5 years and it was mid-repaired in March, 2012. The top phenomena of worn hot air pipelines are brick drop, breakage, severely local wear and deformation, existing hidden danger, so the worn hot air pipelines were renewed. Investigations have been done on the stove damage and design [1,2]. In order to elarify the wear mechanism, the used refractories for hot air pipelines were sampled and analyzed, the properties and structures of worn materials and reused materials are relatively studied. 

Air for the hot blast may also be considered a raw material. The air is preheated in stoves to between 900 and 1300°C. Over 1.5 t of air is required to produce 11 of hot metal (pig iron). SoHd, Hquid, or gaseous fuels, eg, coal, fuel oil, or natural gas, may be added to the hot blast at the tuyeres to replace some of the coke. Oxygen may also be added to the hot blast to increase flame temperature. 

Two years later I bought a stationary trailer, like a small mobile home. I thought that if I bought a new trailer I wouldn t have mold problems I didn t think about the formaldehyde and what it would do to my health. Even though I bought two fans and put them in the windows to pull the air out, I had bronchitis really bad by that evening. I had to disconnect the gas stove and central heat. I cook on a hot plate, which isn t much fun. 

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