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Burner locations

Control of oxides of nitrogen can be accomplished by catalysts or ab-sorbants, but most control systems have concentrated on changing the combustion process to reduce the formation of NOj. Improved burners, change in burner location, staged combustion, and low-temperature combustion utilizing fluidized-bed systems are all currently in use. These combustion improvement systems do not generate waste products, so no disposal problems exist. [Pg.491]

The radiant section tube coils of horizontal fired heaters are arranged horizontally so as to line the sidewalls and the roof of the combustion chamber. In addition, tliere is a convection section of tube coils, winch are positioned as a horizontal bank of tubes above the combustion cham her. Nonnally the tubes are fired vertically from the floor, but they can also be fired horizontally by side wall mounted burners located below the tube coil. Tins economical, high dficiency design currently represents the majority of new horizontal-tube-t1icd heater installations. Duties run from 5 to 250 MMBtu/hr. Six types o) horizontal-tube-fired heaters arc-shown in Figure 3-21. [Pg.83]

Prenflo Coal is fed together with oxygen and steam through four burners located at the lower part of the gasifier. Syngas is produced at a temperature of 1600°C and is... [Pg.53]

Three different types of coal fired boilers were utilized in this study. One type (A) was a dry bottom boiler with direct fired burners located on opposite walls. The second type (B), wet bottom boilers 11 and 12, was operated in parallel with the same coal stream split to feed both boilers simultaneously. The third boiler types (C D) were dry bottom, tangentially fired boilers. [Pg.337]

The arch is made of cast iron or steel and sits under the pans to contain the heat. Oil-fired units have the burner located at the front, slanting upward, and with the fire pointing towards the rear (stack). The inside of an oil-fired arch is lined with ceramic blanket insulation. Wood-fired... [Pg.108]

Rabbles, or blades, suspended from the roof force the coke inward and simultaneously turn the bed, thereby uniformly exposing the coke being calcined to the burners located in the roof. The burners use fuel only for start-up once equilibrium conditions are achieved, the volatiles evolving from the coke are provided with combustion air via the burner ports and the calcining process is self-sustaining. [Pg.184]

Figure 40. Example of a xide-lirecl reformer. A) Left C roxxxection B) Right Radiation burner located in lilt side nail... Figure 40. Example of a xide-lirecl reformer. A) Left C roxxxection B) Right Radiation burner located in lilt side nail...
These fryers are used for small-scale production or for frying very specialty-type products such as kettle-fried Hawaiian-style potato chips. The oil is placed in a large pan where it is heated by gas burners, located under the pan. In certain installations, the oil is heated in an external heat exchanger. In this case, the oil is continuously taken out of the fryer, circulated through an external oil heater, and returned back into the fryer pan. The former method of heating the oil is known as the Direct Heating system, and the latter is called the Indirect Heating system. The external oil heaters can be either steam heated or gas fired. The steam heat... [Pg.2262]

Due to the design of these furnaces, there is typically no fit for oxygen-enriched combustion. One exception is hot top melters which provide some heat via burners located above the bath. In this latter case, supplemental oxy/fuel or premixed oxygen enrichment has been practiced.7... [Pg.225]

Plant data indicate that first the inner diameters of the coils increase and the wall thicknesses decrease as the coils are used. Spalling of the inner surfaces is apparently a major factor. The wall thickness sometimes decreased by as much as 30%. Decreases of the wall thickness may however vary from 5% to 30% around the circumference of the coil. Second, the roughness of surface varies greatly with location. Part of these variations likely depends on local overheating (and burner locations) relative to the coil. [Pg.2980]

The burner orientation with respect to the combustor is also sometimes used to classify the combustor. For example, a wall-fired furnace has burners located in and firing along the wall. [Pg.26]

The rotary fiimace consists of a horizontal cylindrical vessel, in which the metallic charge is heated by a burner located at one side of the furnace. The flue-gases leave the oven through the opposite side. To generate the required heat, fuel or natural gas is used combined with air or pure oxygen. [Pg.43]

The principle of the coke-gas cupola is to replace part of the coke with gas. There are two techniques for burning natural gas in the cupola using air-gas burners, located above the tuyeres using oxygas burners, located in the tuyeres. [Pg.169]

Figure 4.22 (top and bottom drawings) shows soak zone side-sectional views with T-sensor and burner locations (original and recommended). The two middle drawings show temperature profiles at three soak zone firing rates, plus heat consumption rates for losses, for cold air infiltration, and for heating the loads. The sum of these is the heat flux, which corresponds to available heat. [Pg.166]

With thick loads, the pieces should be on piers with high-velocity burners located in rows near the bottoms of both sidewalls, alternating on 4-ft (1.22 m) centers. With this arrangement, flues can be in the roof. One important point In batch operations, do not pass the poc gases of any zone through another zone because that will result in loss of temperature control for the second zone. [Pg.244]

All variations of the previous paragraph are reasons for careful attention to (a) zoning for temperature uniformity control (this chapter) and (b) burner locations, burner flame types, and furnace flow patterns (chap. 7). (See fig. 6.8 showing soak temperature variations between three and five lengthwise zones at minimum firing rates (top set of curves) and at moderate firing rates ([bottom set of curves]). [Pg.262]

The steel industry has been using soaking pits for at least 125 years. Originally, they were simply refractory boxes in the earth with no combustion systems. From these simple units, the industry graduated to regenerative pits which had no instrumentation to the bottom-fired pits with ceramic recuperators to one-way top-fired pits with or without metallic recuperators. With the one-way top-fired pits, more pit area is under the crane per unit of real estate, so they became the universally accepted standard. Typical size 22 ft (6.7 m) long, 8.5 to 10 ft (2.6 to 3.0 m) wide, and 10 to 17 ft (3.0 to 5.2 m) deep. The combustion system has one or two burners located high on one end of the pit with the flue directly beneath them. [Pg.283]

With multiple flues, if anything (scale, refractory crumbs, misplaced loads) partially blocks one or more of the hearth-level flues, that flue s low flow will cause it to cool and other hotter flues will carry more flue gas load, causing them to get hotter. This results in irregular heating of the loads in the furnace, and may eventually cause runaway overheating of the hotter flues. This same sort of unbalance of flue loads can be caused by different firing rates in adjacent zones or by burner locations that create localized positive or negative pressure on one flue entrance more than on another. [Pg.321]

In this 10-min test, a 7.3-m (24-ft) long and 0.51-m (20-inch) wide horizontal polymer sample (total area of 3.25 m /36 ft ) is used inside a 7.6-m (25-ft) long, 0.45-m (17-inch) wide and 0.31-m (12-inch) deep tunnel. Two gas burners, located 0.19 m (7 inch) below the polymer surface and 0.31 m (12 inch) from one end of the tunnel are used as ignition sources. The two burners release 88 kW of heat creating a gas temperature of 900°C near the specimen surface. The flames from the burners cover 1.37 m (4.5 ft) of the length and the entire... [Pg.468]


See other pages where Burner locations is mentioned: [Pg.306]    [Pg.561]    [Pg.483]    [Pg.155]    [Pg.51]    [Pg.88]    [Pg.91]    [Pg.260]    [Pg.155]    [Pg.155]    [Pg.208]    [Pg.172]    [Pg.254]    [Pg.2991]    [Pg.39]    [Pg.526]    [Pg.532]    [Pg.580]    [Pg.587]    [Pg.657]    [Pg.675]    [Pg.44]    [Pg.8]    [Pg.78]    [Pg.209]    [Pg.448]    [Pg.483]    [Pg.93]    [Pg.201]    [Pg.390]    [Pg.5536]   
See also in sourсe #XX -- [ Pg.149 ]




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