JP3102346U - Steam superheater - Google Patents

Abstract

An induction heating type steam superheater capable of superheating high pressure steam.
An annular groove (7, 8) is provided in a flange (3) provided on a steam inflow tube (1) and a flange (6) provided on a superheated steam outflow tube (4), and elastic packings (9, 10) are accommodated in the grooves. Both ends of the heat pipe 11 made of a heat-resistant insulator containing the body 21 are brought into contact with the packings 9 and 10, and the sleeve 15 is brought into contact with the tightening bolts 14 penetrating both the flanges 3 and 6, and both ends come into contact with the flanges 3 and 6. , And a nut 17 is screwed onto the tightening bolt 14 with the loosening washer 16 interposed between the outer surfaces of the flanges 3 and 6.
[Selected drawing] Fig. 1

Description

  The present invention relates to an apparatus for superheating steam at normal pressure or high pressure.

  Conventionally, it is known that steam generated as in a once-through boiler is further heated to about 400 ° C. by heating using fuel, and to about 800 ° C. by electromagnetic induction heating under normal pressure.

  However, in a once-through boiler, superheated steam of 400 ° C. or higher cannot be obtained due to its structure, and the electromagnetic induction heating method can only raise the temperature of steam under normal pressure, and cannot obtain high-temperature superheated steam in a pressurized state. The reason for this is that a tube made of a non-magnetic material such as a quartz tube or a silicon nitride tube is required to guide the steam, but the connection between these and the metal member is difficult, and the thermal expansion of the metal member due to the high temperature And that the tightened portion is easily loosened due to shrinkage, and it is difficult to maintain airtightness.

  Therefore, an object of the present invention is to improve the airtightness of an induction heating type steam superheater under high temperature and high pressure, and to remove loosening of a fastening portion due to thermal expansion and contraction.

  In FIG. 1, reference numeral 1 denotes an inflow pipe, which has a flange 2 connected to a supply pipe of superheated steam and a heating section flange 3, and 4 denotes an outflow pipe, and a flange 5 connected to a superheated steam delivery pipe. And a heating section flange 6. The heating part flanges 3 and 6 have annular grooves 7 and 8, respectively, which retain heat-resistant elastic packings 9 and 10, respectively.

  Reference numeral 11 denotes a heating tube, which is formed of a refractory insulating material such as quartz or silicon nitride ceramic, and has both ends in contact with the packings 9 and 10, respectively. .., And 13,... Are formed in the peripheral portions of the heating portion flanges 3, 6, respectively, and tightening bolts 14, 14,. The sleeves 15, 15... Having a larger diameter than the fastening holes 12, 13 are fitted into the fastening bolts. Nuts 17, 17 are provided at both ends of each tightening bolt with loosening washers 16, 16 in which one or two or more pairs of conical disks are fitted in an abacus shape. The metal members such as the inflow cylinder 1, the outflow cylinder 4, the tightening bolts 14, 14, ..., the sleeves 15, 15, ..., the loosening washers 16, 16, ..., the nuts 17, 17 ... are all SUS304 steel. It is made of non-magnetic metal.

  A heat-resistant heat-insulating tube 18 made of, for example, glass wool or rock wool is fitted around the heating tube 11, and a coil 19 is wound therearound. Inside the quartz tube 11, heating elements 21, 21,... Made of a conductor having a large number of steam heating holes 20, 20,.

  Reference numerals 22 and 23 denote insertion holes for temperature sensors such as thermocouples provided in the inflow cylinder 1 and the outflow cylinder 4, respectively.

  When the nuts 17, 17... Are tightened, both ends of the heating tube 11 are pressed against the packings 9, 10 to keep the space between the heating tube 11 and the flanges 3, 6 airtight. Here, the distance between the flanges 3 and 6 is limited by the sleeves 15, 15,..., So that it is possible to prevent the heating tube 11 from pressing the packings 9, 10 excessively strongly and crushing them.

  When a high-frequency current of, for example, 20 kHz is applied to the coil 19 in the above-described apparatus, the heating element 21 in the heating tube 11 is induction-heated, and the steam flowing from the inflow tube 1 to the outflow tube 4 is heated around the heating element 21 in the heating tube 11. , And is heated when passing through the heating holes 20, 20,....

  Here, airtightness is maintained between the flanges 3 and 6 and the heating tube 11 by the packings 9 and 10, and sleeves 15, 15... Are fitted to the bolts 14, 14. Since the distance between the flanges 3 and 6 is restricted, the packing 9.10 can be prevented from being crushed. In addition, since the packings 9 and 10 are accommodated in the annular grooves 7 and 8, they do not fall off due to expansion and contraction due to a temperature change of each member, and prevent deterioration due to exposure to steam. be able to.

  Therefore, according to the apparatus of the present invention, it is possible to increase the pressure of the steam to be passed to increase the thermal efficiency, and to obtain a high-temperature superheated steam such as 800 ° C. which cannot be obtained with a normal superheated boiler. Is also possible.

FIG. 3 is a longitudinal sectional view of the embodiment of the present invention.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Inflow cylinder 3 Heating part flange 4 Outflow part 6 Heating part flange 7, 8 Annular groove 9, 10 Packing 11 Heating tube 14 Tightening bolt 15 Sleeve 16 Loose retaining washer 17 Nut 18 Heat resistant heat insulating tube 19 Coil 20 Steam heating hole 21 Heating element

Claims (4)

  Heating tubes made of a heat-resistant insulating material containing a heating element by high-frequency induction are provided at both ends between a flange provided on an inflow tube to which steam is supplied and a flange provided on an outflow tube to which superheated steam is sent. In a device in which a high-frequency coil is arranged around the heating tube, each of the elastic packings is accommodated in an annular structure recessed on the opposite surface of the two flanges. A plurality of tightening bolts are provided on the peripheral portion across the flanges and penetrate the flanges. These tightening bolts are covered with sleeves having both ends in contact with the flanges, and loosened between the outer sides of the flanges. A steam superheater characterized in that a nut is screwed to a tip of each of the tightening bolts with a retaining washer interposed therebetween.   The steam superheater according to claim 1, wherein the loosening washer is formed by laminating conical metal disks in an abacus shape.   3. The steam superheater according to claim 2, wherein a plurality of pairs of abacus balls of the metal disk are overlapped and used at the same location. The steam superheater according to claim 1, wherein a heat-resistant heat-insulating tube is provided around the heating tube, and the high-frequency coil is wound around an outer periphery of the heat-insulating tube.

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