The radiant tube heat exchanger
Technical field:
The present invention relates to a kind of radiant tube heat exchanger, particularly a kind of combustion air preheating heat exchanger.
Background technology:
For the used for industrial furnace heat exchanger in the existing industrial combustion system, heat exchange efficiency is lower, and heat exchanger self surface temperature is higher, needs the extra heat-insulating material of laying.Because the volume in the furnace chamber is limit, heat exchange area is big inadequately, causes heat exchanger discharged flue gas temperature higher, and is bigger to the loss of heat.The crushing of heat exchanger is bigger, needs to select high-power combustion fan to overcome corresponding resistance, causes the power consumption of combustion fan to increase.
Summary of the invention:
For overcoming the defective of prior art, the object of the present invention is to provide a kind of radiant tube heat exchanger that is used for industrial furnace, it can increase heat exchange area, improve heat exchange efficiency, can be preheating to 550 degrees centigrade or higher to the normal temperature combustion air from room temperature, realize the energy-saving and cost-reducing of industrial furnace, reduce thermal pollution environment.
Technical solution problem of the present invention adopts following technical scheme:
The radiant tube heat exchanger, comprise Heat exchanger sheet and the heat exchanger tube that is connected with described Heat exchanger sheet, described heat exchanger tube from-inner-to-outer is provided with inner sleeve, middle level fume pipe and outer tube, and an end of described inner sleeve extends to the inner chamber of described Heat exchanger sheet, and the other end communicates with the inner chamber of outer tube; One end of described middle level fume pipe extends to the inner chamber oral area of described Heat exchanger sheet, and other end radial communication has blast pipe, in the end radial communication near the outer tube of Heat exchanger sheet blast pipe is arranged.
The middle part of described outer tube is provided with one section outer tube bellows; Be provided with the inner sleeve bellows at a end away from the inner sleeve of Heat exchanger sheet.
Described inner sleeve is provided with the inner sleeve reinforcement; Described middle level fume pipe is provided with brace rod.
Compared with the prior art, beneficial effect of the present invention is embodied in:
For the used for industrial furnace heat exchanger in the existing industrial combustion system, radiant tube heat exchanger of the present invention can effectively reduce smog discharge temperature, and the hull-skin temperature of heat exchanger is lower than 80 degrees centigrade, and it is heat insulation not need extra insulation material.Blast pipe and blast pipe shift to install, prolonged the heat exchanger time of hot and cold gas, increased its heat exchange area, heat in the flue gas is passed to combustion-supporting normal temperature air by exchange heat, both reduced the temperature of fume emission, improved the temperature of combustion air again, heat exchange efficiency can improve 20% to 40%.The crushing of radiant tube heat exchanger is controlled in 18%, uses common combustion fan just can realize running well.
Description of drawings:
Fig. 1 is a structural representation of the present invention, and arrow is depicted as the flow direction of combustion air among the figure; Figure 1A is the A portion enlarged drawing of Fig. 1.
Number in the figure: 1 Heat exchanger sheet, 3 inner sleeves, 4 adpting flanges, 5 middle level fume pipes, 6 inner sleeve reinforcements, 8 outer tube bellowss, 9 brace rods, 10 blast pipes, 11 inner sleeve bellowss, 12 outer tube end sockets, 15 blast pipes, 16 outer tubes.
Below pass through the specific embodiment, and the invention will be further described in conjunction with the accompanying drawings.
The specific embodiment:
Embodiment: in conjunction with Fig. 1, the radiant tube heat exchanger of present embodiment, comprise cast-in-block wing needle recuperator sheet 1 and the heat exchanger tube that is connected with Heat exchanger sheet 1, the heat exchanger tube from-inner-to-outer is provided with inner sleeve 3, middle level fume pipe 5 and outer tube 16, one end of inner sleeve 3 extends to the inner chamber of Heat exchanger sheet 1, and the other end communicates with the inner chamber of outer tube 16; One end of middle level fume pipe 5 extends to the inner chamber oral area of Heat exchanger sheet 1, and other end radial communication has blast pipe 10, and radial communication has blast pipe 15 on an end of outer tube, and described blast pipe is near the Heat exchanger sheet place.
In order to absorb expansion and the contraction that variations in temperature causes, effectively prevent the stress that thermal shock brings.Be provided with one section outer tube bellows 8 at the middle part of outer tube 16; Be provided with inner sleeve bellows 11 at a end away from the inner sleeve of Heat exchanger sheet.Inner sleeve, outer tube are designed to straight tube, have reduced the resistance during air flows, and have reduced the crushing of combustion air effectively.
In order to strengthen the bonding strength of inner sleeve, middle level fume pipe, inner sleeve is provided with inner sleeve reinforcement 6; The middle level fume pipe is provided with brace rod 9.
In conjunction with Fig. 1, in the use, by adpting flange 4 this heat exchanger is connected on the furnace chamber wall, one end of Heat exchanger sheet 1 is suspended in the furnace chamber, the normal temperature combustion air enters the radiant tube heat exchanger from blast pipe 15, outermost layer (interlayer between outer tube 16 and the middle level fume pipe 5) on the heat exchanger right side flows, enter ventilation inner sleeve 3 after arriving outer tube end socket 12, pass the inner chamber that enters wing needle recuperator sheet 1 behind the adpting flange 4, after combustion air in Heat exchanger sheet and the abundant heat exchange of the high-temperature flue gas outside the Heat exchanger sheet, preheated air is got back to right-hand member after passing adpting flange 4 once more, discharges the radiant tube heat exchanger by the interlayer between middle level fume pipe 5 and the ventilation inner sleeve 7 by exhaust duct 10.The combustion air of this moment has been a high temperature air by original normal temperature state preheating, can send into and participate in burning in the burner.
The Heat exchanger sheet 1 of wing shape is monoblock cast, and flue gas is given the combustion air that flows through from its inner chamber exchange heat when its surface is flow through.Cast-in-block uses and guarantees that it can not produce leak source, and flue gas and combustion air just can not mix together yet, cause that heat exchange is not enough or local temperature is inhomogeneous.Adopting wing shape sheet is exactly to increase its heat exchange area under the situation that takies the furnace chamber inner volume in order to reduce.Heat exchange surface area had both further been strengthened in the multilayer sleeve design of adpting flange 4 right-hand members, had guaranteed that again the temperature of its outer surface is lower than 80 degrees centigrade.Be normal temperature cooling air in the interlayer of its outer tube 16 and flue gas middle sleeve 5, this design combines heat exchange and cooling dexterously.The design of outer tube bellows 8 and inner sleeve bellows 11 can absorb expansion and the contraction that variations in temperature causes, and effectively prevents the stress that thermal shock brings.Straight tube design has reduced the resistance during air flows, and has reduced the crushing of combustion air effectively.