Hot-blast horizontal heater of gas

FIELD: heat engineering, namely accumulator of gas heaters, possibly used for constructing Cowper and ohmic gas heaters for aerodynamic tubes.

SUBSTANCE: heater includes heat accumulating adapter arranged in housing with gas-tight cylindrical outer surface and electric current supply leads of resistive heating member. Heat accumulating member of adapter is zigzag-shaped and it is made of thin strip of sheet material; said member has vertically arranged lamellae mutually spaced by the same distance and placed along axis of heater. Ends of said strip are connected to electric current leads. Annular mutually joined flanges are arranged on ends of adapter. The last has rods arranged between flanges on cylindrical surface; said rods are electrically isolated from flanges and they serve as supports for lamellae of heat accumulating member. Each flange of adapter has three parts (upper ring-half and two lower ring quadrants). There are gaps between parts of rings and casing for providing displacement of ring parts one relative to other and relative to casing by value of length change of lamellae of heat accumulating member at heating and cooling them.

EFFECT: enlarged using range of hot-blast heater due to its simplified design and lowered hydraulic resistance.

3 dwg

 

The invention relates to heat engineering, namely the accumulator gas heaters, and can be used in the development i.e. hot blast stove and ohmic gas heaters for wind tunnels.

Known i.e. hot blast stove, gas heater, where the heat-retaining nozzle used densely Packed cylindrical rods, and the heating elements are placed uniformly over the cross section of the nozzle and is made in the form of tubes with an outside diameter equal to the diameter of the rod tips. The heated gas passes through the narrow channels formed in the body of the nozzle between the terminals and the heating elements (USSR Author's certificate No. 205989, CL F 24 H 7/02, 1965).

The disadvantage of this heater is the low efficiency of heat transfer due to inadequate surface of the heat removal nozzles, the minimum diameter of the rod which is limited by strength conditions.

Known i.e. hot blast stove, gas heater, adopted for the prototype, which has heat-retaining nozzle is made in the form of a cylinder of gas permeable material (e.g. ceramic), hermetically sealed in the housing at the end of the gas outlet (USSR Author's certificate No. 646645, CL F 24 H 7/02, 1978). The heater has high efficiency.

The disadvantage of this gas heater is a great Hydra is velicescu resistance when the flow through it of the working gas, due to the fact that the material of the nozzle in the manufacture of pressed from a powder and sintered. In addition, for the manufacture of heat-retaining nozzle requires a special powder with specific properties. These specific charges, beyond which it is inadvisable to use the heater, narrow the scope of possible use of the heater and complicate the process of its manufacture.

The present invention is to expand the potential application areas i.e. hot blast stove heater and simplification of the process of its manufacture.

Technical result provided by the invention, is to reduce the hydraulic resistance of the heater.

The solution of the task and the specified technical result is achieved by the fact that in the horizontal heater containing heat-retaining nozzle located in the housing with gas-tight cylindrical outer surface, and the contact resistance of the heating element, thermal storage element nozzles made of thin strips of sheet material, has a zigzag shape and the flat part (lamellae), which are arranged vertically at equal distances from each other along the axis of the heater, the ends of the band connected to the current leads, the ends of the nozzles are annular flanges, Scrapland the e among themselves, the nozzle has a rod located between the flanges on the cylindrical surface, elektroizolyatsionnye from the flange and which supports for slat thermal storage element, each flange of the nozzle consists of three parts (the top half and the bottom two quarters of the rings), between the parts of the rings and the casing there are gaps that allow the moving parts of the ring relative to each other and the casing on the magnitude of the changes of the lengths of the slats thermal storage element when the heating and cooling.

The proposed scheme i.e. hot blast stove, gas heater is shown in figure 1.

Figure 2 shows the section a-A.

Figure 3 - remote element I.

Heater (Fig.1-3)horizontally, includes a housing 1, in one of the ends of the channel 2 input and the other channel 3 to output of the working gas. On the inner surface of the housing 1 are elements of a thermal insulation 4, 5, 6. Are the current leads 7, 8 and housing 9 gas-tight cylindrical surface for placing heat-retaining nozzle 10. The heat storage element nozzle is made of a thin strip has a zigzag shape and the flat part 11 (lamellae), which are arranged vertically at equal distances from each other along the axis of the heater. The ends of the band connected to the current leads 7, 8. On the ends of the nozzles are ring the s flanges 12, 13, interconnected. The nozzle has terminals 14 located between the flanges on the cylindrical surface, elektroizolyatsionnye from the flange sleeve 15 and which supports for the slats 11 of the heat storage element. Each flange 12, 13 consists of three parts: the top half rings 16 and the bottom 17, 18 quarters of the rings. Between the parts of the rings 16, 17, 18 and the casing 9 in the seats 19, 20, 21 there are gaps that allow the moving parts of the ring relative to each other and the casing on the magnitude of the changes of the lengths of the slats 11 thermal storage element when the heating and cooling.

I.e. hot blast stove, gas heater works as follows. Include the power supply to the heater. The current through the current leads 7, 8 is passed through the heat storage element nozzles and he warmed up. When heating the slats 11 are extended, quarter 17, 18 rings flanges 12, 13 under the action of its own weight down, supporting the slats in a tense (tense) state, excluding the possibility of distortion and the possibility of electrical contact between the blades. After heating the nozzle to a predetermined temperature, pass the gas through the heater. The gas passing through the heat-retaining nozzle, takes from the nozzle heat and heats up. The slats 11 of the nozzle intensively cooled, their length is reduced and the parts 17, 18 peremeshautsa is up. Due to the fact that the parts 17, 18 are not fixed and have the opportunity to move up as well as reducing the length of the slats, the slats will not occur thermal stresses, they do not accumulate residual deformation and they keep working. When the temperature of the gas after the nozzle during its passage through the heater becomes less than the allowed value, gas and cease producing the next heating the nozzle.

In the proposed gas heater for producing heat-retaining nozzle does not require special porous permeable materials with a rigid structure with certain properties. The nozzle is made of more affordable materials: used thin strips of refractory metals, which are produced in the industry. The manufacture of the nozzle does not require special technologies and equipment. The hydraulic resistance of the proposed design is much less than the hydraulic resistance of structures made of pressed sintered materials. The proposed scheme perform nozzle provides a high efficiency of heat transfer from the nozzle to the working gas and the minimum hydraulic resistance at a certain porosity (prosvetno) nozzles.

Thus, the use of the invention allows to simplify the design, reduce to the minimum the mA hydraulic resistance of the heater and, therefore, to expand the scope of possible applications i.e. hot blast stove heater.

I.e. hot blast stove, gas heater horizontal, containing heat-retaining nozzle located in the housing with gas-tight cylindrical outer surface, and the contact resistance of the heating element, characterized in that the heat storage element nozzles made of thin strips of sheet material, has a zigzag shape and the flat part (lamellae), which are arranged vertically at equal distances from each other along the axis of the heater, the ends of the band connected to the current leads, the ends of the nozzles are annular flanges are fastened together, the nozzle has a rod located between the flanges on the cylindrical surface, elektroizolyatsionnye from the flange and which supports for slat thermal storage element, each flange nozzle consists of three parts (the top half and the bottom two quarters of the rings), between the parts of the rings and the casing there are gaps that allow the moving parts of the rings relative to each other and the casing on the magnitude of the changes of the lengths of the slats thermal storage element when the heating and cooling.



 

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