RU2266186C1 - Heat exchange apparatus heat exchange unit making method - Google Patents

Abstract

FIELD: heat and power engineering, possibly manufacture of heat exchange units of apparatuses for recovering exhaust gas heat of aggregates, particularly for heating air by means of exhaust combustion products from compressor of gas turbine plant of gas pumping aggregate in compressor stations of main gas conduits.

SUBSTANCE: method comprises steps of making in manufacturing stations blanks of shells of housings manifolds for supplying and discharging heated air, tubes and tube walls, members of unit carcass; bending tubes for forming four-way bent in horizontal plane tubes having successively changed along length two outer and two inner branches and three elbows joining said branches; in each, mainly in odd row forming two tubes with bent portions having length πR where R - radius of tube; forming bent portions of one tube in its inner elbow and forming bent portions of other tube in two outer elbows; forming other tubes of odd and even rows with bent portions having length πR/2 and joining them by means of rectilinear inserts with successively changed length values. In each row two inner branches of each next tube of row with joining elbow are formed in such a way that they are inscribed from outside into bending formed by respective branches and by joining them elbow of previous tube of said row. Minimum-length tube of each row has development length l_min consisting at least 0.75 of development length l_max of maximum -length tube of row. After making bent tubes, said tubes are pressurized; manifolds for supplying and discharging air are assembled and tube walls are welded-in to them. Unit carcass and manifolds for supplying and discharging air are mounted; tubes are packed and they are again pressurized together with manifolds.

EFFECT: enhanced effectiveness of manufacturing process.

10 cl, 14 dwg

Description

The invention relates to a power system, and in particular to the manufacture of a heat exchanger block of a heat exchanger of the type of a block or block-section regenerative air heater and its constituent separate technologically connected devices for recovering heat from exhaust gases from the units, in particular, for heating the air with exhaust combustion products coming from compressor of a gas turbine installation of a gas pumping unit at compressor stations of main gas pipelines.

A known method of manufacture and installation of a block of a heat exchanger apparatus of a heater with V-shaped tubes, including the manufacture of a two-pack block of V-shaped tubes with manifolds for supplying and discharging air and with a bypass chamber between two packages of tubes, mounting on a tube sheet using tube expansion and welding, closing the heat exchange unit with covering walls, while the two-pack block of V-tubes is made of separate two-pack heat transfer modules from V-tubes with bypass chambers and with covering walls (RU No. 2176051, F 23 L 15/04, 2001).

The known method does not provide high manufacturability, which allows to reduce labor and material costs in the manufacture of the device, as well as the compactness of the laying of heat transfer pipes while ensuring the strength and rigidity of the structure.

The objective of the present invention is to increase the efficiency of manufacturing heat transfer units of block or block-section heat exchangers such as regenerative air heaters and individual technologically related devices included in it.

The problem is solved due to the fact that according to the invention, a method of manufacturing a heat exchanger block of a heat exchanger such as a block or block-section regenerative air heater provides for the step-by-step execution at the processing stations of the blanks of the shells of the bodies of the manifolds for supplying and removing heated air, pipes and tube boards, elements of the block frame, bending pipes on pipe bending equipment to obtain four-way pipes bent in the horizontal plane with two external and two with internal straight branches and connecting them with three bends, two external and one internal, and pipes are made with successively changing lengths of straight branches and bends, while for each mainly odd row, two pipes are made with bends of length πR, where R is the radius of the pipe which are performed on one pipe on the inner bend and on the other on two external bends, and the remaining pipes for even and odd rows are made with bends of length πR / 2, which are connected by rectilinear inserts of varying length, while for each row two internal branches of each subsequent pipe in a row with a bend connecting them are executed inscribed on the outside in a bend formed by the corresponding branches and connecting them with a bend of the previous pipe in this row, with a pipe of minimum length for each row with a scan length l _{min of} at least 0.75 scan length l _max pipes of maximum length in a row, and after manufacturing of curved pipes, they are crimped, collectors for supply and exhaust air to by cooking tube plates in them, mounting the frame of the block and the air supply and exhaust manifolds, packing the pipes and re-crimping them together with the air supply and exhaust manifolds as part of the unit.

Curved pipes can be manufactured with a distance H between the longitudinal axes of the external straight branches, which is (30-85) d, the length of the straight branches l 'and l' ', which is (74-145) d and (100-135) d, respectively, where d - the outer diameter of the pipe, [m]; l 'is the length of the external straight branch, [m]; l "is the length of the internal rectilinear branch, [m].

Pipes of each row can be manufactured with a total length l ' _∑ and l'' _{∑ of} rectilinear external and internal branches located perpendicular to the flow of the cooled medium, which is at least 72% of the total length of the reamers L _{∑ of the} series pipes, and the total length of the straight inserts N' _∑ and H ' _{∑ of the} three pipe bends of the row, the heated medium in which is located in countercurrent with the cooled medium, which is up to 18% of the total length L _{∑ of the} row pipes.

For each odd row, preferably an even number of tubes can be produced, preferably not less than two and not more than ten.

For each even row, an odd number of tubes can be produced, preferably at least three and not more than nine.

When bending pipes for a row with a larger number of pipes than in adjacent rows, straight bend inserts can perform a length varying from a value of 2a ± 10% [m] to a value of 2a (m-1) ± 10% [m] , and for adjacent rows with fewer pipes, straight-line inserts can perform a length varying from a value equal to 2a ± 10% [m] to a value equal to a (2n-1) ± 10% [m], where a is the step between the axes rectilinear branches of the same name of adjacent pipes of a row, [m]; m is the number of pipes in a row with a large number of pipes, mainly an even number of pipes in odd rows; n is the number of pipes in a row with a smaller number of pipes, mainly an odd number of pipes in even rows.

After manufacturing the curved pipes, they can be hung on a device for vertical storage with a spatial support having support tiers arranged in tiers and with a working width in the hanging plane that exceeds the maximum distance between the axes of the outer branches of the curved predominantly extreme pipe of the row and the working height from the lower tier bracket to the base of the support exceeding the maximum overall length of a curved pipe hung on the brackets of the lower tier.

They can use a device for the vertical storage of pipes, in which the distance between the supporting surface of the bracket of each underlying tier and the lower surface of the adjacent overlying overlying tier exceeds the external diameter of the pipes hung on the brackets.

They can use a device for vertical storage, the support brackets of which in the plane normal to the plane of the pipe hanging are located with the excess of their free ends above the supporting ones by an amount not less than 0.75 d, where d is the external diameter of the pipe being hung.

They can use a device for vertical storage, the support brackets of which have a working overhang from the support end of up to 75 d, where d is the external diameter of the pipe to be hung.

The technical result provided by the invention is to increase the efficiency of manufacturing heat exchangers of block or block section heat exchangers such as regenerative air heaters and individual technologically connected devices included in the composition due to the optimal arrangement of bent pipes in the block developed in the invention, the shape of the heat exchangers, and the specified ratio of the lengths of the sections of heat transfer pipes, differently oriented to the direction of movement of the coolant, printing high technological assembly, reducing labor costs in the manufacture, as well as good washability of the surface pipes with a coolant.

The invention is illustrated by drawings, which depict:

figure 1 shows a block-sectional regenerative air heater, side view;

figure 2 is the same, a top view;

figure 3 - heat transfer unit regenerative air heater, top view;

figure 4 - four-branch curved heat transfer pipe, top view;

figure 5 - node a in figure 3;

figure 6 is a section along BB in figure 3;

Fig.7 is a heat transfer unit of a regenerative air heater with open manhole covers, top view;

on Fig - heat transfer unit regenerative air heater in a perspective view;

figure 9 - collector inlet or outlet air with a tube plate, the main view;

figure 10 is a section along bb in figure 9;

figure 11 - node G in figure 10;

on Fig - a device for the vertical storage of bent pipes, side view;

Fig.13 is the same end view;

on Fig is a fragment of a device with support brackets, side view.

A method of manufacturing a heat exchanger block of a heat exchanger type block or block-sectional regenerative air heater is as follows.

A method of manufacturing a heat exchanger block of a heat exchanger of the type of a block or block-section regenerative air heater provides for element-wise execution at processing posts (not shown) of shell shell blanks 2 for supply manifolds 3 and for 4 outlet of heated air, pipes 5 and tube plates 6, block frame elements 1, are flexible pipes 5 on pipe bending equipment (not shown) to obtain four-way bent in the horizontal plane of pipes 5 with two external 7 and two internal 8 straight branches and connecting them with three elbows, two external 9 and one internal 10, and pipes 5 are made with successively varying lengths of straight branches 7 and 8 and elbows 9 and 10, while for each mostly odd row, two pipes 5 are made with bends 11 πR length, where R is the radius of the pipe 5, which is performed on one pipe on the inner 10 elbow, and on the other on the two outer 9 elbows, and the remaining pipes 5 for even and odd rows are performed with bends 12 of πR / 2 length, which match rectilinear inserts 13 sequentially of varying length, while for each row two internal branches 8 of each subsequent pipe 5 in a row with a bend 9 connecting them are executed inscribed from the outside in a bend formed by the corresponding branches 8 and connecting a bend 9 of the previous pipe 5 in this row, and the pipe 5 minimum length for each row operate with the length of the scanning l _min, of not less than 0.75 sweep length l _max of the pipe 5, the maximum length in the series, and after fabrication of curved tubes 5 produce their molding, assembly of collectors 3 and 4 for supplying and discharging Sports and be welded to them in tube plates 6, assembling the frame unit 1 and the collectors 3 and 4 for supplying and removing air, the packing tube 5 and re-molding them together with collectors 3 and 4 for supplying and removing air in the composition of the block 1.

Curved pipes 5 are made with a distance H between the longitudinal axes 14 of the outer straight branches 7, comprising (30-85) d, the length of the straight branches l 'and l' ', which is respectively (74-145) d and (100-135) d, where d is the outer diameter of the pipe 5, [m]; l 'is the length of the outer straight branch 7, [m]; l "- the length of the internal straight branch 8, [m].

Pipes 5 of each row are made with a total length of l ' _∑ and l'' _{∑ of} straight external and internal 8 branches located perpendicular to the flow of the cooled medium, which is at least 72% of the total length of the reamers L _{∑ of} pipes of 5 rows, and the total length of the straight inserts 13 N ' _∑ and H'' _{∑ of} three elbows 9, 10 of the 5th row pipes, the heated medium in which is located in countercurrent with the cooled medium, up to 18% of the total length L _{∑ of the} 5th row pipes.

For each odd row, an even number of tubes 5 are preferably made, preferably not less than two and not more than ten.

For each even row, an odd number of tubes 5 are preferably made, preferably not less than three and not more than nine.

When bending pipes 5 for a row with a larger number of pipes 5 than in adjacent rows, the rectilinear inserts 13 of the elbows 9, 10 are made with a length varying from a value of 2a ± 10% [m] to a value of 2a (m-1) ± 10% [m], and for adjacent rows with a smaller number of pipes 5, rectilinear inserts 13 are of a length that varies from a value equal to 2a ± 10% [m] to a value equal to a (2n-1) ± 10% [m], where a is the step between the axes of the same straight branches 7, 8 of adjacent pipes of the 5th row, [m]; m is the number of pipes 5 in a row with a large number of pipes 5, mainly an even number of pipes 5 in odd rows; n is the number of pipes 5 in a row with a smaller number of pipes 5, mainly an odd number of pipes 5 in even rows.

After the manufacture of the bent pipes 5, they are hung on the device 15 for vertical storage with spatial support brackets 16 arranged in tiers, with a support 17 with a working width in the hanging plane that exceeds the maximum distance between the axes of the outer branches 7 of the curved mainly end pipe 5 of the row and the working height from the bracket 16 of the lower tier to the base 18 of the support 17, exceeding the maximum overall length of the bent pipe 5, hung on the brackets 16 of the lower tier.

A device 15 is used for vertical storage of pipes 5, in which the distance between the supporting surface 19 of the bracket 16 of each underlying tier and the lower surface 20 of the adjacent overlying tier exceeds the external diameter of the pipes 5 hung on the brackets 16.

A device 15 for vertical storage is used, the support brackets 16 of which are located in a plane normal to the hanging plane of the pipes 5 with the excess of their free ends 21 above the supporting 22 by an amount not less than 0.75 d, where d is the outer diameter of the hanging pipe 5.

A device 15 for vertical storage is used, the supporting brackets 16 of which have a working overhang from the supporting end 22 of up to 75 d, where d is the outer diameter of the pipe 5 being hung.

Claims (10)

1. A method of manufacturing a heat exchanger block of a heat exchanger of the type of a block or block-section regenerative air heater, characterized in that it provides for step-by-step execution of shell shells for supplying and discharging heated air, pipes and tube plates, frame elements of the block, pipe bending pipe-bending equipment with obtaining four-way pipes bent in the horizontal plane with two external and two internal rectilinear branches connecting them with three elbows - two external and one internal, and the pipes are made with successively varying lengths of straight branches and elbows, while for each mainly odd row, two pipes are made with bends of length πR, where R is the radius of the pipe one pipe on the inner bend, and the other on the two outer bends, and the remaining pipes for even and odd rows are made with bends of length πR / 2, which mate with straight inserts of successively varying lengths, while For each row, two internal branches of each pipe in the row with the elbow connecting them are executed inscribed from the outside in the bend formed by the corresponding branches and the elbow connecting the previous pipe in this row, and the pipe of minimum length for each row is made with a scan length l _min , component of at least 0.75 reamer length l _max pipes of maximum length in a row, and after manufacturing of curved pipes, they are crimped, assembled air supply and exhaust manifolds with tube boards welded into them, installation the frame of the block and manifolds for supplying and discharging air, packing pipes and re-crimping them together with the manifolds for supplying and discharging air as part of the block. 2. The method according to claim 1, characterized in that the curved pipes are made with a distance H between the longitudinal axes of the external straight branches, constituting (30-85) d, the length of the straight branches l 'and l' ', respectively (74-145) d and (100-135) d, where d is the outer diameter of the pipe, m, l 'is the length of the outer rectilinear branch, m, l' 'is the length of the inner rectilinear branch, m 3. The method according to claim 1, characterized in that the pipes of each row are made with a total length l ' _∑ and l'' _{∑ of} rectilinear external and internal branches located perpendicular to the flow of the cooled medium, which is at least 72% of the total length of the reamers l _∑ pipes of the row, and the total length of the rectilinear inserts H ' _∑ and H'' _{∑ of the} three bends of the pipes of the row, the heated medium in which is located in countercurrent with the cooled medium, up to 18% of the total length L _{∑ of the} pipes of the row. 4. The method according to claim 1, characterized in that for each odd row, an even number of pipes is preferably made, preferably at least two and not more than ten. 5. The method according to claim 1, characterized in that for each even row a preferably odd number of pipes are made, preferably not less than three and not more than nine. 6. The method according to claim 1, characterized in that when bending pipes for a row with a larger number of pipes than in adjacent rows, the straight knee inserts perform a length that varies from a value equal to 2a ± 10%, m, to a value equal to 2a (m-1) ± 10%, m, and for adjacent rows with a smaller number of pipes, straight-line inserts perform a length varying from a value equal to 2a ± 10%, m, to a value equal to a (2n-1) ± 10%, m, where a is the step between the axes of the same straight branches of adjacent pipes in a row, m, m is the number of pipes in a row with a large number of pipes, mainly an even number of pipes in odd venoms, n - number of tubes in a row with a smaller number of tubes, preferably an odd number of tubes in the even rows. 7. The method according to claim 1, characterized in that after the manufacture of curved pipes they are hung on a device for vertical storage with a spatial support having support tiers arranged in tiers in height with a working width in the hanging plane that exceeds the maximum distance between the axes of the external branches of the bent the extreme pipe of the row, and the working height from the bracket of the lower tier to the base of the support exceeding the maximum overall length of the curved pipe hung on the brackets of the lower tier. 8. The method according to claim 7, characterized in that they use a device for vertical storage of pipes, in which the distance between the supporting surface of the bracket of each underlying tier and the lower surface of the adjacent overlying higher tier exceeds the external diameter of the pipes hung on the brackets. 9. The method according to claim 7, characterized in that they use a device for vertical storage, the support brackets of which in the plane normal to the plane of hanging pipes are located with the excess of their free ends above the support ends by an amount not less than 0.75d, where d is outer diameter of the pipe to be hung. 10. The method according to claim 7, characterized in that they use a device for vertical storage, the support brackets of which have a working overhang from the support end of up to 75d, where d is the outer diameter of the pipe to be hung.

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