CN212158221U - Gas-gas heat exchanger in furnace under high-temperature large span - Google Patents
Gas-gas heat exchanger in furnace under high-temperature large span Download PDFInfo
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- CN212158221U CN212158221U CN202020252202.6U CN202020252202U CN212158221U CN 212158221 U CN212158221 U CN 212158221U CN 202020252202 U CN202020252202 U CN 202020252202U CN 212158221 U CN212158221 U CN 212158221U
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Abstract
The utility model discloses a gas-gas heat exchanger under a high temperature and a large span in a furnace, which comprises a plurality of hanging pipes and a plurality of groups of heat exchanger pipe rings arranged in a tail shaft flue, wherein an outlet wind chamber and an inlet wind chamber are fixedly connected on flat steel of a wrapping wall behind the tail shaft flue through a plurality of groups of upper pre-embedded plates and lower pre-embedded plates; each group of heat exchanger tube coils comprises a plurality of heat exchanger tube coils positioned on the same longitudinal surface, the inlet end of each heat exchanger tube coil penetrates through the flat steel of the rear wrapping wall and is positioned in the inlet air chamber, and the outlet end of each heat exchanger tube coil penetrates through the flat steel of the rear wrapping wall and is positioned in the outlet air chamber; each hanging pipe is connected with a group of heat exchanger pipe coils through a supporting structure; the utility model discloses can reduce the support span of gas heat exchanger in the large-scale power plant boiler afterbody shaft, reduce the comprehensive stress of heat exchanger under the high condition of gas temperature, can prevent that the heat exchanger from producing and warping, collapsing down, reduce the potential safety hazard that comprehensive stress arouses.
Description
Technical Field
The utility model relates to a heat exchanger in a furnace, in particular to an air-flue gas heat exchanger used under a high-temperature large span in the furnace.
Background
At present, the national emission requirements for the flue gas of coal-fired power plants are becoming strict, and particularly strict emission limit values are set for nitrogen oxides (NOx). In the flue gas denitration technology for reducing nitrogen oxides, urea is increasingly used by power plants as a denitration reducing agent. The conventional urea pyrolysis process in the prior engineering is to heat air or cold (hot) primary air of a boiler to about 350-600 ℃ through a heater or a heat exchanger to be used as a heat source for urea pyrolysis. Wherein, the cost of the power plant can be increased by adopting the electric heater, and the annual increased service power is a large expense. The heat exchanger utilizes the high-temperature flue gas of the boiler to heat the cold (hot) primary air of the boiler, and then introduces the heated air into the pyrolysis furnace to provide a heat source for the urea pyrolysis reaction. Because the energy-saving effect is obvious, the flue gas-air heat exchanger technology is increasingly applied to the field of flue gas denitration urea pyrolysis.
The smoke-air heat exchanger technology can be divided into two schemes of in-furnace arrangement and out-furnace arrangement. The scheme that the heat exchanger is arranged outside the furnace needs to introduce flue gas into the heat exchanger from a boiler and introduce air into the heat exchanger, the scheme needs to be provided with a flue gas introduction and extraction channel and a heat exchange shell, the structure is complex, and the occupied space of equipment is large. The scheme that the heat exchanger is arranged in the boiler is that the heat exchange tube is arranged in a rear vertical shaft of the boiler, air is introduced into the tube to exchange heat with smoke outside the tube, a smoke channel does not need to be additionally arranged, the structure is simple, and the heat exchange effect is good.
Patent documents: the utility model discloses a utility model patent publication of publication No. CN104896495B proposes a heat exchange system is heated to stove flue gas that provides urea pyrolysis heat source, and the regional level of shaft arranges the heat exchanger pipe behind the boiler, relies on the economizer to hang the built-in fitting on the pipe and supports the heat exchange tube, and the support span of heat exchange tube depends on current economizer to hang a tub span size, and the heat exchange tube passes the band steel of back package wall intertube. The span of the hanging pipes of most boilers does not consider the deformation risk for the comprehensive stress of the gas-gas heat exchanger, and the heat exchanger deforms and collapses when the temperature of the flue gas in the rear vertical shaft of the boiler is too high or the span of the hanging pipes is too large, so that the potential safety hazard of the comprehensive stress is large.
Disclosure of Invention
The utility model aims at the above-mentioned not enough of prior art, provide a gas heat exchanger under the big span of stove interior high temperature, it can reduce the support span of gas heat exchanger in the large-scale power plant boiler afterbody shaft, reduces the comprehensive stress of heat exchanger under the high condition of smoke temperature, can prevent that the heat exchanger from producing to warp, collapse down, reduces the potential safety hazard that comprehensive stress arouses.
In order to achieve the purpose, the utility model discloses a gas-gas heat exchanger under big span of stove interior high temperature, hang the pipe and follow the array heat exchanger tube coil that the stove width direction was arranged including several in locating afterbody shaft flue, its characterized in that: a plurality of groups of upper embedded plates and lower embedded plates are fixedly connected to the flat steel of the rear wrapping wall of the tail vertical shaft flue, an outlet air chamber is fixedly connected with the plurality of groups of upper embedded plates, and an inlet air chamber is fixedly connected with the plurality of groups of lower embedded plates; each group of heat exchanger tube coils comprises a plurality of heat exchanger tube coils positioned on the same longitudinal surface, the inlet end of each heat exchanger tube coil penetrates through the flat steel of the rear wrapping wall and is positioned in the inlet air chamber, and the outlet end of each heat exchanger tube coil penetrates through the flat steel of the rear wrapping wall and is positioned in the outlet air chamber; each hanging pipe is connected with a group of heat exchanger pipe rings through a supporting structure, each supporting structure comprises an upper embedded part and a lower embedded part fixedly connected to the hanging pipe, an upper rod piece, a lower rod piece and a supporting pipe clamp, an upper ear plate and a lower ear plate are fixedly connected to two ends of the upper rod piece, the upper ear plate is provided with a longitudinal waist round hole, the upper ear plate is connected with the upper embedded part through an upper pin shaft penetrating through the longitudinal waist round hole, the lower ear plate is provided with a transverse waist round hole, the lower ear plate is connected with the supporting pipe clamp through a lower pin shaft penetrating through the transverse waist round hole, two ends of the lower rod piece are connected with the lower embedded part and the lower ear plate, and the group of heat exchanger pipe rings are arranged in the supporting pipe;
the utility model has the advantages that the triangular supporting structure consisting of the rod piece, the ear plates and the pin shaft is arranged on the hanging pipe, the supporting span of the pipe ring of the gas-gas heat exchanger can be shortened, the waist circular holes are arranged on the two ear plates, the free expansion of the heat exchange pipe can be ensured, the comprehensive stress of the heat exchanger can be reduced under the condition of high smoke temperature, the heat exchanger is prevented from deforming and collapsing, and the potential safety hazard caused by the comprehensive stress is reduced;
as a further improvement of the utility model, the outlet air chamber and the inlet air chamber are both sectional air chambers, and expansion joints are arranged between the sectional air chambers; the expansion stress can be reduced, and the high smoke temperature working condition is adapted;
as a further improvement of the utility model, a heat-insulating layer is arranged outside the outlet air chamber, a plurality of supporting beams are fixedly connected to the flat steel of the rear wrapping wall, the supporting beams are fixedly connected with supporting rods, and the upper ends of the supporting rods are in contact with the lower end of the outlet air chamber; the heat-insulating layer can improve the temperature of outlet air, and the outlet air chamber is supported by the support rods and the support beams after being provided with the heat-insulating layer and is not welded, so that the air chamber can be freely expanded in the width direction of the furnace, inclined pull supports are prevented from being arranged on the ladle wall, and the load applied to the ladle wall is reduced to the minimum;
as a further improvement of the utility model, the inlet end and the outlet end of each heat exchanger tube ring in the shaft flue are both provided with a section of fork-shaped bent pipe; the expansion difference of the pipe ring along the depth direction of the boiler and the pipe system stress can be reduced;
as a further improvement of the utility model, each group of heat exchanger tube rings are also provided with a positioning tube clamp, the positioning tube clamp and the supporting tube clamp respectively comprise two side plates and a plurality of supporting plates connected with the two side plates, and a plurality of heat exchanger tube rings are respectively arranged between the two side plates and on the respective supporting plates; the lower pin shaft penetrates through two side plates of the supporting pipe clamp; the positioning pipe clamps and the supporting pipe clamps can ensure that the pipe rows are flat in the vertical direction;
as a further improvement of the utility model, a plurality of sealing covers are arranged in the outlet wind chamber and the inlet wind chamber, the sealing covers are fixedly connected on the flat steel of the rear wrapping wall, and the inlet end and the outlet end of each heat exchanger pipe ring are respectively positioned in the inlet wind chamber or the outlet wind chamber after passing through the respective sealing cover; the sealing cover can improve the sealing performance of the smoke in the furnace;
as a further improvement of the utility model, an anti-abrasion cover plate is arranged outside the middle bent end of the heat exchanger tube ring positioned at the outermost ring in each group of heat exchanger tube rings; the heat exchanger is arranged at the rear steering chamber of the boiler, the gas-gas heat exchanger is greatly washed by the smoke from the front of the boiler to the rear of the boiler, and the abrasion of the abrasion-proof cover plate can be reduced;
to sum up, the utility model discloses can reduce the support span of gas-gas heat exchanger in the large-scale power plant boiler afterbody shaft, reduce the comprehensive stress of heat exchanger under the high condition of gas temperature, can prevent that the heat exchanger from producing to warp, collapse down, reduce the potential safety hazard that comprehensive stress arouses.
Drawings
Fig. 1 is a front view of an embodiment of the present invention.
Fig. 2 is a schematic top view of fig. 1.
Fig. 3 is a partially enlarged view of a portion a of fig. 1.
Fig. 4 is a left side view of fig. 3.
Fig. 5 is a partially enlarged view of fig. 1 at B.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 5, the gas-gas heat exchanger in the embodiment under the large span of high temperature in the furnace includes a tail shaft flue 1, a plurality of hanging pipes 2 arranged in the tail shaft flue 1, and a plurality of groups of heat exchanger pipe rings 3 arranged along the furnace width direction, wherein the plurality of hanging pipes 2 are divided into a plurality of rows arranged in the tail shaft flue 1, and each row of hanging pipes includes two hanging pipes 2 located in the same vertical longitudinal plane; a plurality of groups of upper pre-embedded plates 5 and lower pre-embedded plates are welded and fixedly connected to flat steel 4 of a rear wrapping wall of a tail shaft flue 1, an outlet air chamber 7 is welded and fixedly connected with the plurality of groups of upper pre-embedded plates 5, an inlet air chamber 8 is fixedly connected with the plurality of groups of lower pre-embedded plates, the outlet air chamber 7 and the inlet air chamber 8 are both sectional air chambers, expansion joints 9 are arranged between the air chambers, a heat insulation layer 10 is arranged outside the outlet air chamber 7, a plurality of supporting beams 11 are welded and fixedly connected to the flat steel 4 of the rear wrapping wall, the supporting beams 11 are both fixedly connected with supporting rods 12, the upper ends of the supporting rods 12 are in contact with the lower end of the outlet air chamber 7, a plurality of sealing covers 13 or 14 are arranged in the outlet air chamber 7 and the inlet air chamber 8, and the sealing covers 13; each group of heat exchanger tube rings 3 comprises three heat exchanger tube rings 3a positioned on the same longitudinal surface, the inlet end of each heat exchanger tube ring 3a penetrates through the flat steel 4 of the rear wrapping wall and the sealing cover 14 and is positioned in the inlet air chamber 8, the outlet end of each heat exchanger tube ring 3a penetrates through the flat steel 4 of the rear wrapping wall and the sealing cover 13 and is positioned in the outlet air chamber 7, and the inlet end and the outlet end of each heat exchanger tube ring 3a positioned in the shaft flue are both provided with a section of forked bent tube 15 with a certain angle; an anti-abrasion cover plate 32 is arranged outside the middle bent end of the heat exchanger tube ring positioned at the outermost ring in each group of heat exchanger tube rings 3; each hanging pipe 2 is connected with a group of heat exchanger pipe rings through a supporting structure, each supporting structure comprises an upper embedded part 16, a lower embedded part 17, an upper rod part 18, a lower rod part 19 and a supporting pipe clamp 20 which are fixedly connected to the hanging pipe 2 in a welding mode, each upper embedded part 16 and each lower embedded part 17 comprise a section of arc-shaped plate (convenient to weld with the hanging pipe 2), each end of each upper rod part 18 is fixedly connected with an upper lug plate 21 and a lower lug plate 22, each upper lug plate 21 is provided with a longitudinal waist circular hole 23, each upper lug plate 21 is connected with each upper embedded part 16 through an upper pin shaft 24 penetrating through the longitudinal waist circular hole 23, each lower lug plate 22 is provided with a transverse waist circular hole 25, each lower lug plate 22 is connected with the supporting pipe clamp 20 through a lower pin shaft 26 penetrating through the transverse waist circular hole 25, and each end of each lower rod part 19 is connected with each lower embedded part 17; each group of heat exchanger tube rings 3 are also provided with two positioning tube clamps 27, each positioning tube clamp 27 and each supporting tube clamp 20 comprises two side plates 28 and a plurality of supporting plates 29 for connecting the two side plates 28, and the three heat exchanger tube rings 3a of each group of heat exchanger tube rings 3 are arranged between the two side plates 28 and on the respective supporting plates 29; the lower pin shaft 26 passes through two side plates 28 of the supporting pipe clamp 20; the two side plates 28 can simultaneously clamp the upper and lower sections of each group of heat exchanger tube coils 3, or only clamp the upper section of each group of heat exchanger tube coils 3;
when in use, air enters each group of heat exchanger tube rings 3 through the inlet air chamber 8, exchanges heat with flue gas, enters the outlet air chamber 7 and is discharged; the utility model has the advantages that the supporting span of the tube ring of the gas-gas heat exchanger can be shortened and the support is stable by arranging the triangular supporting structure consisting of the two rods 18 and 19, the two ear plates 21 and 22 and the two pin shafts 24 and 26 on the hanging tube 2; the waist circular holes 23 and 25 arranged on the two ear plates 24 and 26 are connected by adopting a pin shaft, so that the expansion displacement of the heat exchanger tube in the horizontal direction and the vertical direction can be effectively absorbed, the free expansion of the heat exchange tube is ensured, the comprehensive stress of the heat exchanger can be reduced under the condition of high smoke temperature, the heat exchanger is prevented from deforming and collapsing, and the potential safety hazard caused by the comprehensive stress is reduced;
the expansion joint 9 can reduce the expansion stress of the outlet air chamber 7 and the inlet air chamber 8, and is suitable for the working condition of high smoke temperature;
the heat-insulating layer 10 can improve the temperature of outlet air, and the outlet air chamber 7 is supported by the support rods 12 and the support beams 11 after being added with the heat-insulating layer 10 and is not welded, so that the air chamber can freely expand in the width direction of the furnace, inclined pull supports are prevented from being arranged on the ladle wall, and the load applied to the ladle wall is reduced to the minimum;
the forked bent pipe 15 can reduce the expansion difference and the pipe system stress of the pipe ring along the depth direction of the boiler;
the positioning pipe clamps 27 and the supporting pipe clamps 20 can ensure that the pipe rows are flat in the vertical direction;
the sealing covers 13 and 14 can prevent the smoke from entering the air chamber, and improve the sealing performance of the smoke in the furnace;
because the heat exchanger is arranged at the rear turning chamber of the boiler, the gas-gas heat exchanger is greatly washed by the smoke from the front of the boiler to the rear of the boiler at the position, and the abrasion of the abrasion-proof cover plate 32 can be reduced; the utility model discloses also can be used to the heat transfer of other gaseous medium and flue gas.
Claims (7)
1. The utility model provides a gas heat exchanger under big span of stove interior high temperature, hangs the pipe and follows the array heat exchanger tube coil of stove wide direction range including several in locating afterbody shaft flue, its characterized in that: a plurality of groups of upper embedded plates and lower embedded plates are fixedly connected to the flat steel of the rear wrapping wall of the tail vertical shaft flue, an outlet air chamber is fixedly connected with the plurality of groups of upper embedded plates, and an inlet air chamber is fixedly connected with the plurality of groups of lower embedded plates; each group of heat exchanger tube coils comprises a plurality of heat exchanger tube coils positioned on the same longitudinal surface, the inlet end of each heat exchanger tube coil penetrates through the flat steel of the rear wrapping wall and is positioned in the inlet air chamber, and the outlet end of each heat exchanger tube coil penetrates through the flat steel of the rear wrapping wall and is positioned in the outlet air chamber; every hangs the pipe and all links to each other with a set of heat exchanger tube circle through bearing structure, bearing structure all includes built-in fitting and lower built-in fitting of linking firmly on hanging the pipe, go up the member, lower member and support pipe clamp, it has last otic placode and lower otic placode to go up the member both ends and has linked firmly, it is equipped with vertical waist round hole to go up the otic placode, it is connected through the last round pin axle that passes vertical waist round hole with last built-in fitting to go up the otic placode, the lower otic placode is equipped with horizontal waist round hole, lower otic placode is connected through the lower round pin axle that passes horizontal waist round hole with the support pipe clamp, the both ends and the built-in fitting of lower member and lower otic placode are connected, this.
2. The gas-gas heat exchanger for the high-temperature large-span furnace according to claim 1, wherein: the outlet air chamber and the inlet air chamber are both sectional air chambers, and expansion joints are arranged between the sectional air chambers.
3. The gas-gas heat exchanger under high temperature and large span in the furnace according to claim 1 or 2, characterized in that: the outlet air chamber is provided with a heat insulation layer, a plurality of supporting beams are fixedly connected to the flat steel of the rear wrapping wall, the supporting beams are fixedly connected with supporting rods, and the upper ends of the supporting rods are in contact with the lower end of the outlet air chamber.
4. The gas-gas heat exchanger for the high-temperature large-span furnace according to claim 3, wherein: the inlet end and the outlet end of each heat exchanger tube ring in the vertical shaft flue are provided with a section of fork-shaped bent tube.
5. The gas-gas heat exchanger for the high-temperature large-span furnace according to claim 4, wherein: each group of heat exchanger tube rings are also provided with a positioning tube clamp, each positioning tube clamp and each supporting tube clamp comprise two side plates and a plurality of supporting plates for connecting the two side plates, and the plurality of heat exchanger tube rings are arranged between the two side plates and on the respective supporting plates; the lower pin shaft penetrates through two side plates of the supporting pipe clamp.
6. The gas-gas heat exchanger for the high-temperature large-span furnace according to claim 5, wherein: and a plurality of sealing covers are arranged in the outlet air chamber and the inlet air chamber, the sealing covers are fixedly connected to flat steel of the rear wrapping wall, and the inlet end and the outlet end of each heat exchanger tube ring penetrate through the respective sealing cover and are respectively positioned in the inlet air chamber or the outlet air chamber.
7. The gas-gas heat exchanger for the high-temperature large-span furnace according to claim 6, wherein: and an anti-abrasion cover plate is arranged outside the middle bent end of the heat exchanger tube ring positioned at the outermost ring in each group of heat exchanger tube rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020252202.6U CN212158221U (en) | 2020-03-04 | 2020-03-04 | Gas-gas heat exchanger in furnace under high-temperature large span |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020252202.6U CN212158221U (en) | 2020-03-04 | 2020-03-04 | Gas-gas heat exchanger in furnace under high-temperature large span |
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| Publication Number | Publication Date |
|---|---|
| CN212158221U true CN212158221U (en) | 2020-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020252202.6U Active CN212158221U (en) | 2020-03-04 | 2020-03-04 | Gas-gas heat exchanger in furnace under high-temperature large span |
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| Country | Link |
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| CN (1) | CN212158221U (en) |
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2020
- 2020-03-04 CN CN202020252202.6U patent/CN212158221U/en active Active
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