SU1317261A1 - Regenerative heat exchanger - Google Patents

Abstract

The invention relates to energy and m. used for regenerative heating of air. The invention allows to increase the efficiency of work by intensifying heat exchange. The heating chamber (K) 1 is placed inside the cooling K 2 and is provided in the upper part with a separation device 11 in the form of a cone. The heat exchanger may contain a lift (L

Description

emu and downstream bypass branches (PV) and the second heat exchange stage with its own heating and cooling K, performed similarly to K 1 and 2 of the first stage. In this case, the second stage is sequentially connected to K 1 and 2 by means of PV. The heat exchanger may also contain a restrictive grid that is installed in the lift PV. Intermediate bulk material (CM) 7 m. formed by large and small fractions, the equivalent diameter of the first of which exceeds

one

The invention relates to energy, can be used for regenerative heating of air in metallurgy, boiler technology.

The aim of the invention is to increase work efficiency by intensifying heat exchange.

FIG. 1 shows a regenerative heat exchanger, longitudinal section; in fig. 2 - two-stage regenerative heat exchanger.

Regenerative heat exchanger contains chambers 1 and 2 of heating and cooling with pipes 3 and 4 and air exhaust and pipes 5 and 6 for supplying and discharging gas and vertical branches of intermediate bulk material 7 placed in chambers 1 and 2, included in the latter’s circulation circuit and connected between a transfer device 8, and a fixed heat exchange nozzle 9 in the form of stainless steel spheres with a supporting device in the form of grids 10. The heating chamber 1 is located inside the cooling chamber 2 and is equipped in the upper part with a separation device 11 in the form of a cone. In addition, the heat exchanger may additionally contain lifting and lowering bypass branches 12 and 13 and a second heat exchange stage with its heating and cooling chambers 1 and 2, made similar to chambers 1 and 2 of the first step, respectively connected in series with the stone twice the diameter of the second. Cold air through the pipe 3 enters K 1 through the grate 17. The air passes through a dense layer of CM 7 and a fixed heat exchange nozzle 9 and the grate 10 and enters K 2, where hot gas is supplied. The latter transports the CM 7 to the nozzle 6 and heats it. In the separation device 11, the CM 7 slows down its movement and, separating from the gas flow, via the overflow device 8 enters K1. 2 Cp. f-ly, 2 ill.

Frames 1 and 2 of the first stage by the above branches 12 and 13, and the fixed tip 9 in the second stage cooling chamber 2 can be made intermittent to form through openings 1A for the passage of air. The heat exchanger may also optionally contain an organic mesh 15 installed in the lifting branch 12,

intermediate bulk material 7 can be formed in coarse and fine fractions, the equivalent diameter of the first of which exceeds the diameter of the second at least 2 times.

The flow area of the chambers 1 and 2 is 1.5-3.0 times larger than the flow section of the re-flow device 8.

In order to ensure reliable movement of the bulk material 7 between the fixed heat exchange nozzle 9, the equivalent diameter of the latter must be 10 to 15 times the diameter of the material 7. In order to increase the exposure heat of the material 7 to the cooling chamber 2, braking inserts 16 can be installed. The walls of the heating chamber 1 are made of paired louvered grilles 17.

Regenerative heat exchanger works as follows.

Cold air through the pipe 3 inlet enters the heating chamber 1

through the louvered grill 17, passes through a dense layer of intermediate

31

the bulk material 7 and the fixed heat exchange nozzle 9, is heated and exits through the nozzle 4. It is possible to perform a sector-specific chamber

1 heating with air flow by sector. Bulk material 7 is freely poured through a fixed heat exchange nozzle 9 and lattice 10 with a cell size of 1.1 - 1.2 times smaller than the size of the nozzle 9. Then the bulk material 7 enters the chamber

2Cooling, where, through pipe 5, they are fed g ory g-az, which transports bulk material 7 to branch pipe 6 of the outlet and simultaneously heats it. At the same time, the bulk material 7 is heated to a temperature close to the temperature of the hot gas due to contact with the gas and braking when it collides with the braking inserts 16. In the separation device 11, the bulk material 1 slows down its movement, it separates from the hot gas and, via the transfer device 8, the material 7 flows into the heating chamber 1 in a dense layer. When a regenerative heat exchanger is performed with a two-stage cold air, it first enters through the nozzle 3 into the second-stage heating chamber 1, characterized in that the stationary nozzle 9 is filled with an intermittent to form through openings 14, and the bulk material 7 is formed by small and large fractions, the latter is circulated within the heating chamber 1 of each stage, and the fine fraction of the flowing heat carrier is transported through openings 14 in the fixed nozzle 9, louvered grille 17 along the descending branch 13 into the cooling chamber 2 step, where it is mixed with a coarse fraction of bulk material 7 circulating within this step. The stationary nozzle 9 increases the residence time of the bulk material 7 in the heating chamber 1, and is also an intermediate heat carrier (for this, it must have a high thermal conductivity) and prevents the large fraction of loose particles from being carried away.

material 7 air flow. Coarse fraction of bulk material 7

72614

It is retained by the restriction grid 15 within the heating chamber 1 of the second stage, and in the heating chamber 1 of the first stage, by a separation device 1 1.

Claims (3)

1.Regenerative heat exchanger, jg containing heating and cooling chambers with inlet and outlet connections for heat exchanging media and vertical branches of intermediate fluid heat transfer fluid J5 l, included in the circuit of the latter and interconnected by means of a flow-through device, and stationary heat exchange; a nozzle with a supporting device in the form of peQ rods, distinguished by the fact that, in order to increase efficiency by intensifying heat exchange when using a material beam as an intermediate heat carrier, the heating chamber is placed inside the cooling chamber and provided with a separation device in the upper part. 2. A heat exchanger according to claim 1, in which it further comprises a lifting and lowering bypass branches and a second heat exchange stage with its own heating and cooling chambers, made similarly to the first step chambers, respectively connected in series with the first stage chambers these branches, and the fixed attachment in the cooling chamber of the second stage is made intermittently with the formation of through openings for the passage of the corresponding heat exchange medium.  3. The heat exchanger according to claim 2, in which it additionally contains a restrictive grid installed in the lifting bypass branch, the intermediate heat transfer medium is formed in a large and small fraction, the equivalent diameter of the first one exceeds at least 2 times the diameter of the second. eleven Editor K. Voloshchuk Compiled by N. Belva Tehred L. Oliynyk Proofreader A, Zimokosov Order 2411/35 Tiraik 611 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 ipuff.2