CN216898475U

CN216898475U - Spiral coil pipe heat exchange device for coke oven ascending pipe

Info

Publication number: CN216898475U
Application number: CN202220319710.0U
Authority: CN
Inventors: 陈宗凯; 王跃; 董真真
Original assignee: Tangshan Baokai Technology Co ltd
Current assignee: Tangshan Baokai Technology Co ltd
Priority date: 2022-02-17
Filing date: 2022-02-17
Publication date: 2022-07-05
Anticipated expiration: 2032-02-17

Abstract

The utility model relates to a spiral coil pipe heat exchange device for a coke oven ascending pipe, and belongs to the technical field of raw coke oven gas waste heat recovery of the ascending pipe. The technical scheme of the utility model is as follows: the inside spiral coil (6) that is equipped with of pipeline section body, spiral coil (6) are by from last to being the multilayer coil that the heliciform set up down and constitute, welded connection board between each layer coil, and spiral coil and the whole barrel that constitutes the lateral wall of connecting plate are closed. The spiral coil forms a spiral protrusion on the side wall of the cylinder. One surface of the closed cylinder body, which is in contact with the high-temperature raw gas, is coated with a heat-conducting glazed membrane type wall (7). According to the utility model, the connection plates are welded among the layers of the coil pipes, so that the stability of the spiral coil pipes is enhanced. The heat-conducting glazed membrane type wall isolates corrosive gas in high-temperature raw gas, and the service life of the heat exchange device is prolonged. The front ends of the fins are provided with semicircular notches for disturbing the flow of the crude gas at the edge of the laminar boundary layer and absorbing the convection heat and the radiant heat of the crude gas in the annular space of the inner wall of the ascending tube.

Description

Spiral coil pipe heat exchange device for coke oven ascending pipe

Technical Field

The utility model relates to a spiral coil pipe heat exchange device for a coke oven ascending pipe, and belongs to the technical field of raw coke oven gas waste heat recovery of the ascending pipe.

Background

In the prior art, in the field of waste heat recovery of a coke oven gas riser, a spiral coil type heat exchanger is used for heat exchange of working medium soft water and heat source crude gas, each layer of coil of the spiral coil is in a suspended state, the stability is poor, in addition, heat conduction is conducted in sequence through an inner wall membrane, an inner wall structure, an inner wall outer membrane, a plastic filler, an outer membrane of the coil, a wall of the coil and an inner wall membrane of the coil, the heat exchange coefficient is small, and the heat resistance is large. The heat of the crude gas in the high-generation period can not be fully absorbed, and no matter the crude gas is a metal fin, the burning loss and the corrosion rate of the inner wall of the metal are high, so that hidden troubles are left for long-term safe operation. The alumina heat-conducting ceramic glaze surface has large heat transfer and heat exchange coefficients, can solve the operation hidden trouble if being applied to a heat exchanger for heat exchange, and has larger research value and application space. In addition, the turbulence effect of the existing heat exchanger fin is poor, and improvement is needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a spiral coil heat exchange device for a coke oven ascending pipe, which strengthens the stability of spiral coils by welding connecting plates among layers of coils; the heat-conducting glazed membrane type wall is arranged on the inner side of the cylinder body with the side wall formed by the spiral coil and the connecting plate integrally to be closed, so that the coil is isolated and protected from raw gas, burning loss is avoided, and the corrosion rate is reduced; the front ends of the fins are provided with semicircular notches for disturbing the flow of crude gas at the edge of the laminar boundary layer, so that the problems in the background art are solved.

The technical scheme of the utility model is as follows:

the utility model provides a coke oven tedge spiral coil pipe heat transfer device, contains the pipeline section body, and the inside spiral coil pipe that is equipped with of pipeline section body, spiral coil pipe are by from last to being multilayer coil pipe that the heliciform set up down and constitute, welding connecting plate between each layer coil pipe, and spiral coil pipe and connecting plate wholly constitute the lateral wall and be closed barrel, the upper and lower end opening of barrel.

The spiral coil forms a spiral protrusion on the side wall of the cylinder.

The side wall is a heat-conducting glazed membrane wall coated on one surface of the closed cylinder body contacted with the high-temperature raw coke oven gas.

The side wall is welded with a plurality of fins arranged along the circumferential direction on the cylinder wall at the contact side of the closed cylinder body and the high-temperature raw coke oven gas, the end parts of the fins are provided with a plurality of semicircular notches which are sequentially arranged from top to bottom, and the fins are wrapped with heat-conducting glaze film type walls.

The side wall is equipped with the clamp cover for closed barrel is equipped with outward, presss from both sides the cover and is double-deck sleeve structure, and the side wall is that closed barrel sets up in the annular space that double-deck sleeve structure formed.

The pipe section body is of a double-sleeve structure consisting of a protective layer and a supporting body, a heat insulation structure is arranged between the protective layer and the supporting body, and flexible filling is arranged between the supporting body and the closed type cylinder body.

The fin welding is equipped with a plurality of from last to the half breach that surrounds that sets gradually down in one side of closed barrel, and the quantity that partly surrounds the breach is the same with the number of piles of coil pipe, and the diameter that partly surrounds the breach matches between with the coil pipe, and a plurality of partly surround the breach on the fin and match respectively and set up on each layer coil pipe to welded fastening.

The water inlet end of the spiral coil is communicated with the water inlet pipe, and the water outlet end of the spiral coil is communicated with the steam outlet pipe;

and the two ends of the pipe section body are respectively provided with a top connecting flange and a bottom connecting flange.

The protective layer and the support body are both made of stainless steel plates.

The top opening of the pipe section body is a raw coke oven gas outlet, and the bottom opening is a raw coke oven gas inlet.

The utility model replaces the original metal heat-removing inner wall, and the connecting plates are welded among the coil pipes to form a cylindrical structure, and the connecting plates are made of the same material as the coil pipes. The aluminum oxide heat-conducting ceramic glaze is sprayed on the convex surfaces in the connecting plate and the coil pipe and is sintered to form a smooth glaze structure, namely a heat-conducting glaze membrane type wall, and the heat-conducting glaze membrane type wall forms a protective layer, so that the coil pipe and raw coke oven gas are isolated and protected, burning loss is avoided, and the corrosion rate is reduced. The heat-conducting glaze film type wall has large heat transfer coefficient and is beneficial to the heat absorption of crude gas in a high-generation period; meanwhile, the heat-conducting glaze membrane wall is relatively high in temperature, and the condensed trace tar has good fluidity and gradually moves to a high-temperature area at the bottom of the riser under the action of gravity to volatilize or burn. The fins are made of the same material as the coil pipe, are welded with the coil pipe and the connecting plate, and can be sprayed with alumina heat-conducting ceramic glaze to form a working part of the heat collector. The front ends of the fins are provided with semicircular notches for disturbing the flow of crude gas at the edge of the laminar boundary layer.

The flexible filling is composed of a framework and a flexible filling material, the framework is a mixture formed by silica and ceramic fibers, and the flexible filling material has certain strength and can block heat transfer between the heat-conducting glaze membrane type wall and the supporting body. The injection of the flexible filler is completed by adopting a grouting and grouting mode after the heat-conducting glaze membrane wall and the supporting body are fixed.

The utility model has the following positive effects:

(1) the stability of the spiral coil pipe is enhanced by welding the connecting plates among the layers of the coil pipes;

(2) the connecting plate and the coil pipe are welded to form a cylinder body with a closed side wall, aluminum oxide heat-conducting ceramic glaze is sprayed and sintered to form a heat-conducting glazed membrane wall, and the heat-conducting glazed membrane wall is used for isolating SO in high-temperature raw coke oven gas_2、H₂S, corrosive gas prolongs the service life of the heat exchange device;

(3) the front ends of the fins adopt semicircular notches and are used for disturbing the flow of the crude gas at the edge of the laminar boundary layer and absorbing the convection heat and the radiant heat of the crude gas in the annular space of the inner wall of the ascending tube;

(4) the protruding parts and the fins of the spiral coil increase the heating area, and are directly contacted with high-temperature raw coke oven gas, so that the thermal resistance of thermal convection and thermal radiation is reduced, and the heat is more fully taken;

(5) in the whole coking stage, the heat-conducting glaze membrane-type wall forms a high-temperature area, so that the concentrated condensation of tar is avoided, even if trace tar is formed and condensed, the heat-conducting glaze membrane-type wall can rapidly move downwards under the action of gravity, and volatilize the tar in the high-temperature area at the bottom and burn the tar;

(6) the spiral coil forms a spiral bulge on the surface of the cylinder with the side wall being closed, the spiral bulge is similar to a raw coke oven gas transverse sweeping circular tube, laminar raw coke oven gas at the edge is disturbed, the laminar flow thickness is reduced, and the convection heat of the raw coke oven gas is favorably absorbed.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is a schematic view of a fin structure according to the present invention;

FIG. 3 is a top view of the helical coil and fins of the present invention;

FIG. 4 is a membrane wall construction of the present invention;

in the figure: top flange 1, play steam pipe 2, insulation construction 3, supporter 4, flexible packing 5, spiral coil 6, heat conduction glaze diaphragm type wall 7, fin 8, protective layer 9, inlet tube 10, bottom flange 11, crude gas export 12, crude gas entry 13, half surround breach 14, semi-circular breach 15.

Detailed Description

The utility model is further described with reference to the following figures and examples:

the utility model provides a coke oven tedge spiral coil pipe heat transfer device, contains the pipeline section body, and the inside spiral coil 6 that is equipped with of pipeline section body, spiral coil 6 comprises from last multilayer coil pipe that is the heliciform setting down, welding connecting plate between each layer coil pipe, and spiral coil pipe and the whole constitution lateral wall of connecting plate are closed barrel, the upper and lower end opening of barrel.

The spiral coil forms a spiral protrusion on the side wall of the cylinder.

And a heat-conducting glaze membrane type wall 7 is arranged on one side of the closed cylinder body, which is in contact with the high-temperature raw coke oven gas.

The side wall is welded on the cylinder wall of the closed cylinder body and the side contacted with the high-temperature raw coke oven gas with a plurality of fins 8 arranged along the circumferential direction, the end parts of the fins 8 are provided with a plurality of semicircular notches 15 which are sequentially arranged from top to bottom, and the fins are externally wrapped with a heat-conducting glaze membrane type wall 7.

The pipeline section body is of a double-sleeve structure consisting of a protective layer 9 and a supporting body 4, a heat insulation structure 3 is arranged between the protective layer 9 and the supporting body 4, and a flexible filling 5 is arranged between the supporting body 4 and the closed type cylinder body. The skeleton of the flexible filling 5 is made of a mixture of silica and ceramic fibers, so that the flexible filling has certain strength and can block heat transfer between the heat-conducting glaze membrane wall and the support body 4. The support body 4 is isolated from the external space by adopting the heat insulation structure 3, wherein the outer edge of the heat insulation structure is provided with the protective layer 9, so that the heat insulation structure is protected from being damaged.

Fin 8 welds one side of closed barrel and is equipped with a plurality of from last to the half breach 14 that surrounds that sets gradually down, forms great contact cross section area, and the quantity that partly surrounds breach 14 is the same with the number of piles of coil pipe, and the diameter that partly surrounds breach 14 matches between the coil pipe, and a plurality of on the fin 8 partly surround breach 14 and match respectively and set up on each layer coil pipe to welded fastening.

The water inlet end of the spiral coil 6 is communicated with the water inlet pipe 10, and the water outlet end of the spiral coil is communicated with the steam outlet pipe 2; and the two ends of the pipe section body are respectively provided with a top connecting flange 1 and a bottom connecting flange 11.

The protective layer 9 and the support body 4 are made of stainless steel plates.

The top opening of the pipe section body is a crude gas outlet 12, and the bottom opening is a crude gas inlet 13.

The helical coil 6 may be a plurality of parallel helical coils, such as a double helical coil or a triple helical coil. Taking a double-spiral coil as an example, two parallel coils are arranged spirally together, two adjacent coils are welded with a connecting plate to form a cylinder with a closed side wall, and the upper end and the lower end of the cylinder are open.

The fin root area belongs to the tail end of fin heat conduction and forms a relatively high temperature area, and is affected by the relatively high temperature of the fin root in the whole junction period, so that the inner surface (heat-conducting glaze membrane wall) of the ascending tube is positioned in an isothermal line dense area in an internal temperature field, coking and condensation are effectively reduced, and the downward movement of trace tar on the surface is accelerated.

The fins are 24 groups, and the fins of the 24 groups are also coated with heat conduction glaze membrane type walls which are connected with the heat conduction glaze membrane type walls on the cylinder body into a whole, and the expansion coefficients are similar.

As shown in fig. 1-4, the embodiment specifically implements the following processes:

the heat exchanger finishes intaking by inlet tube 10, rises through the winding of spiral coil 6, and high temperature raw coke oven gas gets into the pipeline section body (heat transfer device's workspace) from raw coke oven gas entry 13, and at the heat exchange workspace, raw coke oven gas carries out the heat exchange with heat conduction glaze diaphragm type wall 7, and fin 8 constantly destroys the flow state of raw coke oven gas simultaneously for raw coke oven gas is by laminar flow to turbulent flow transition. The raw gas formed by turbulent flow continuously impacts the heat-conducting glazed membrane type wall 7 and the fins along with the transverse flow, the vortex and the vortex. The high-temperature raw gas transfers heat to the heat-conducting glaze membrane type wall 7 and the fins in a heat convection and heat radiation mode, wherein the connecting plates and the fins 8 are metal pieces made of the same material as the coil, and the heat of the connecting plates and the fins 8 is transferred to the coil pipe through the homogeneous metal wall surface. The water flow in the spiral coil pipe changes direction continuously, and moves along the tangential direction of the arc line to complete heat exchange with the pipe wall of the spiral coil pipe. The heated water flow (and the vaporized nuclear bubbles) in the spiral coil 6 is guided to the steam drum through the steam outlet pipe 2, and the heat extraction work is finished. The temperature of the crude gas passing through the heat exchange working area is reduced to 450-500 ℃, and the crude gas enters the bridge pipe section through a crude gas outlet 12 and a top connecting flange 1.

Claims

1. A spiral coil pipe heat exchange device for a coke oven ascending pipe is characterized in that: contain the pipeline section body, the inside spiral coil (6) that is equipped with of pipeline section body, spiral coil (6) comprise from last multilayer coil that is the heliciform setting down, welded connection board between each layer coil, and spiral coil and the whole constitution lateral wall of connecting plate are closed barrel.

2. The coke oven riser spiral coil heat exchange device of claim 1, wherein: the spiral coil forms a spiral protrusion on the side wall of the cylinder.

3. The coke oven riser spiral coil heat exchange device of claim 1 or 2, wherein: one surface of the closed cylinder body, which is in contact with the high-temperature raw gas, is coated with a heat-conducting glazed membrane type wall (7).

4. The coke oven riser spiral coil heat exchange device of claim 1 or 2, wherein: the sealed barrel is welded with a plurality of fins (8) arranged along the circumferential direction on the barrel wall on the side of contact with the high-temperature raw coke oven gas, the end parts of the fins (8) are provided with a plurality of semicircular notches (15) which are sequentially arranged from top to bottom, and the fins are wrapped with heat-conducting glaze membrane type walls (7).

5. The coke oven riser spiral coil heat exchange device of claim 1 or 2, wherein: the closed type barrel is externally provided with a jacket which is of a double-layer sleeve structure, and the closed type barrel is arranged in an annular space formed by the double-layer sleeve structure.

6. The coke oven riser spiral coil heat exchange device of claim 1 or 2, wherein: the pipe section body is of a double-sleeve structure consisting of a protective layer (9) and a support body (4), a heat insulation structure (3) is arranged between the protective layer (9) and the support body (4), and flexible filling (5) is arranged between the support body (4) and the closed cylinder body.

7. The coke oven riser spiral coil heat exchange device of claim 4, wherein: fin (8) welding is equipped with a plurality of from last to partly surrounding breach (14) that set gradually down in one side of closed barrel, and the quantity that partly surrounds breach (14) is the same with the number of piles of coil pipe, and the diameter that partly surrounds breach (14) matches between with the coil pipe, and a plurality of partly surround breach (14) on fin (8) match respectively and set up on each layer coil pipe to welded fastening.

8. The coke oven riser spiral coil heat exchange device of claim 1 or 2, wherein: the water inlet end of the spiral coil (6) is communicated with the water inlet pipe (10), and the water outlet end of the spiral coil is communicated with the steam outlet pipe (2); and the two ends of the pipe section body are respectively provided with a top connecting flange (1) and a bottom connecting flange (11).

9. The coke oven riser spiral coil heat exchange device of claim 6, wherein: the protective layer (9) and the support body (4) are both made of stainless steel plates.