Hot blast gas heater

FIELD: heat engineering, namely accumulator type gas heaters, possibly used at developing hot blast gas heaters for aerodynamic tubes.

SUBSTANCE: gas heater includes cylindrical heat accumulating adapter sealed in housing near end of gas outlet. Novelty is that heater includes rod arranged along axis of heat accumulating adapter, supporting grid and cylindrical gas-tight casing. Heat accumulating member of adapter is made of thin corrugated strip whose one end is secured to rod. Corrugated strip is twisted around rod in the form of compact coil arranged together with supporting grid in casing. Height of strip corrugation is equal to thickness of strip.

EFFECT: improved design of heater due to its lowered hydraulic resistance.

1 dwg

 

The invention relates to heat engineering, namely the accumulator gas heaters, and can be used in the development i.e. hot blast stove 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 rods 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 the 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 large hydraulic resistance is ellenie during 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 drawbacks limit the lower level of gas pressure and an upper level unit gas costs, beyond which it is inadvisable to use the heater. They 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 the heater containing a cylindrical heat-retaining nozzle, tightly compacted at the end of the gas outlet, a rod positioned along the axis of the heat-retaining nozzle, the thrust grating and a cylindrical gas-tight casing, the heat storage element nozzles made of thin corrugated strips, one end of which is fastened to the rod, and the corrugated band twisted around the rod to form a tight roll that is installed instead of the ones with thrust bars in the casing, the height of the corrugations in the strip is equal to its thickness.

The proposed scheme i.e. hot blast stove, gas heater shown in the drawing.

The heater 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. Has rod 7 located along the axis of the heater, hard grating 8 and a cylindrical gas-tight casing 9, compacted in the building at the end of the exit gas by means of a seal 10. The heat storage element nozzle 11 is made of thin corrugated strips, one end of which is fastened to the rod 7 in the form of a dense roll, twisted around the rod and installed with thrust bars 8 in the casing 9. The height of the corrugations in the strip is approximately equal to its thickness. The corrugations are located on the surface of the strip along the axis of the roll with variable pitch increasing as the distance from its end side of the rod 7. Step h of the corrugations varies in the range d × arccos (1-2δd) ≤ h ≤ D × arccos (1-2δ/D), where d, D are the diameters of the rod 7 and the casing 9, 8 - strip thickness. The heating element 12 is located in the annular gap between the casing 9 and the insulation 5.

I.e. hot blast stove, gas heater works as follows.

Include a heating element 12 and produce understand the roar of the heat-retaining nozzle 11 to a predetermined temperature. Then begin to pass gas through the heater. Passing through the heat-retaining nozzle, the gas takes heat from the nozzle and heated. When the temperature of the gas after the nozzle becomes less than the minimum allowable 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) roll nozzles.

Thus, the use of the invention allows to simplify the design, reduce the 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, containing a cylindrical heat-retaining nozzle, tightly compacted in the building at the end of the gas outlet, characterized in that the heater has a rod positioned along the axis of the heat-retaining nozzle, the thrust grating and a cylindrical gas-tight casing, the heat storage element nozzles made of thin corrugated strips, one end of which is fastened to the rod, and the corrugated band twisted around the rod to form a tight roll that is installed with the stop bars in the casing, the height of the corrugations in the strip is equal to its thickness.



 

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