CN210426131U - Flue gas circulating system - Google Patents
Flue gas circulating system Download PDFInfo
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- CN210426131U CN210426131U CN201921450291.9U CN201921450291U CN210426131U CN 210426131 U CN210426131 U CN 210426131U CN 201921450291 U CN201921450291 U CN 201921450291U CN 210426131 U CN210426131 U CN 210426131U
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- flue gas
- temperature flue
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- heat storage
- pipeline
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Abstract
The utility model discloses a flue gas circulation system, include: a pair of heat storage tanks having heat storage chambers built therein; the circulating pipeline is communicated with the heat storage box at one side, the heat storage box at the other side and the waste steel hopper and is divided into a high-temperature flue gas pipeline and a low-temperature flue gas pipeline; and a plurality of directional control valves disposed on the circulation line; the circulating pipeline is also provided with an induced draft fan which is used for pressurizing and conveying the low-temperature flue gas cooled by the heat storage chamber of the heat storage box at one side to the heat storage chamber of the heat storage box at the other side, heating the low-temperature flue gas to a high-temperature state and then conveying the heated low-temperature flue gas to the waste steel hopper, and the induced draft fan is arranged on the low-temperature flue gas pipeline. The flue gas circulating system has the advantages of simple structure and long service life.
Description
Technical Field
The utility model relates to an industrial furnace technical field especially relates to flue gas circulation system of steel scrap preheater.
Background
With the increasing demand for scrap ratio in converter steelmaking in the steel industry, preheating of scrap plays an increasingly important role in reducing energy consumption and increasing yield of the converter, and therefore scrap preheating equipment is also increasingly favored. The flue gas circulation system is an important component of the scrap steel preheating equipment and is used for providing high-temperature flue gas for a scrap steel hopper so as to achieve the purpose of preheating scrap steel. The flue gas circulation system of the existing scrap steel preheating equipment in the market has the following defects: the draught fan all sets up on high temperature pipeline, works under high temperature for a long time for the draught fan is easy ageing, thereby influences the normal work of draught fan, needs often to overhaul, and the life of draught fan is short, consequently, is necessary to study a flue gas circulation system.
SUMMERY OF THE UTILITY MODEL
To the weak point that exists in the above-mentioned technique, the utility model provides a can effectively improve draught fan life's flue gas circulation system.
The utility model provides a technical scheme that its technical problem adopted is: a flue gas recirculation system comprising: a pair of heat storage tanks having heat storage chambers built therein; the circulating pipeline is communicated with the heat storage box at one side, the heat storage box at the other side and the waste steel hopper and is divided into a high-temperature flue gas pipeline and a low-temperature flue gas pipeline; and a plurality of directional control valves disposed on the circulation line; the circulating pipeline is also provided with an induced draft fan which is used for pressurizing and conveying the low-temperature flue gas cooled by the heat storage chamber of the heat storage box at one side to the heat storage chamber of the heat storage box at the other side, heating the low-temperature flue gas to a high-temperature state and then conveying the heated low-temperature flue gas to the waste steel hopper, and the induced draft fan is arranged on the low-temperature flue gas pipeline.
Preferably, a heat supply burner is arranged on the heat storage box.
Preferably, the middle part of regenerator is formed with the regenerator, the upper portion of regenerator be with the combustion chamber of regenerator intercommunication, the lower part of regenerator be with the regenerator intercommunication is used for the buffer chamber that the buffer room that the low temperature gas was used for buffering in order to supply the draught fan siphons away, wherein, the air current in the regenerator flows up and down.
Preferably, the regenerator comprises a plurality of heat accumulators, a steel grid fixedly arranged below the heat accumulators for supporting the heat accumulators, and blocking bricks arranged above the heat accumulators for protecting the heat accumulators.
Preferably, the heat accumulator is an aluminum heat accumulation ball.
Preferably, the diameter of the heat accumulator is in the range of: 15-25 mm.
Preferably, the distribution height of the heat accumulator in the up and down direction has a range of: 400-600 mm.
Preferably, the distribution height of the heat accumulator in the up-down direction is 500 mm.
Preferably, the reversing valve includes a first high-temperature flue gas reversing valve, a second high-temperature flue gas reversing valve, a first low-temperature flue gas reversing valve, a second low-temperature flue gas reversing valve, a third low-temperature flue gas reversing valve and a fourth low-temperature flue gas reversing valve, the circulation pipeline includes a first high-temperature flue gas pipeline provided with the first high-temperature flue gas reversing valve, a second high-temperature flue gas pipeline provided with the second high-temperature flue gas reversing valve, a first low-temperature flue gas pipeline provided with the first low-temperature flue gas reversing valve, a second low-temperature flue gas pipeline provided with the second low-temperature flue gas reversing valve, a third low-temperature flue gas pipeline provided with the third low-temperature flue gas reversing valve and a fourth low-temperature flue gas pipeline provided with the fourth low-temperature flue gas reversing valve, wherein one end of the first high-temperature flue gas pipeline is communicated with the combustion chamber of the heat storage tank on one side, Another tip intercommunication the scrap steel hopper, a tip intercommunication of second high temperature flue gas pipeline's combustion chamber, another tip intercommunication of opposite side heat accumulation case the scrap steel hopper, a tip of first low temperature flue gas pipeline with the air intake intercommunication of draught fan, another tip and the surge chamber intercommunication of one side heat accumulation case, a tip of second low temperature flue gas pipeline with the air intake intercommunication of draught fan, another tip and the surge chamber intercommunication of opposite side heat accumulation case, a tip of third low temperature flue gas pipeline with the air outlet intercommunication of draught fan, another tip and the surge chamber intercommunication of one side heat accumulation case, a tip of fourth low temperature flue gas pipeline with the air outlet intercommunication of draught fan, another tip and the surge chamber intercommunication of opposite side heat accumulation case.
Preferably, the first low-temperature flue gas pipeline, the second low-temperature flue gas pipeline, the third low-temperature flue gas pipeline and the fourth low-temperature flue gas pipeline are made of carbon steel pipes, and the first high-temperature flue gas pipeline and the second high-temperature flue gas pipeline are made of carbon steel pipes and lined with liners.
Compared with the prior art, the utility model, its beneficial effect is: the utility model provides a flue gas circulating system, its draught fan is located low temperature flue gas pipeline, has effectively prolonged the life of draught fan to prolong the life of whole flue gas circulating system, avoided frequent maintenance, the effectual use cost that reduces;
be provided with a pair of heat storage case, all be provided with the heat supply nozzle on each heat storage case, the heat supply nozzle on one side heat storage case is at the during operation, and the heat supply nozzle on the opposite side heat storage case is flameout state, has effectively alleviateed the working strength of heat supply nozzle, has prolonged the life of heat supply nozzle to a certain extent.
Drawings
FIG. 1 is a schematic structural view of a flue gas circulation system according to the present invention;
fig. 2 is a second schematic structural view of the flue gas circulation system of the present invention;
fig. 3 is a schematic view of the internal structure of the heat storage tank of the present invention.
In the figure: 10. a first heat storage tank; 11. a first regenerator; 111. a heat accumulator; 112. a steel grating; 113. blocking bricks; 12. a combustion chamber; 13. a buffer chamber; 20. a second heat storage tank; 21. a second regenerator; 30. a first heat supply burner; 40. a second heat supply burner; 50. an induced draft fan; 60. a scrap hopper; 61. a first high temperature flue gas duct; 611. a first high temperature flue gas reversing valve; 62. a second high temperature flue gas duct; 621. a second high-temperature flue gas reversing valve; 63. a first low temperature flue gas duct; 631. a first low temperature flue gas reversing valve; 64. a second low temperature flue gas duct; 641. a second low temperature flue gas reversing valve; 65. a third low temperature flue gas duct; 651. a third low-temperature flue gas reversing valve; 66. a fourth low temperature flue gas duct; 661. and a fourth low-temperature flue gas reversing valve.
Detailed Description
The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.
As shown in fig. 1 to 3, the utility model provides a flue gas circulation system, include: for convenience of explanation, the pair of heat storage tanks are respectively named as a first heat storage tank 10 and a second heat storage tank 20, a first heat storage chamber 11 is formed in the first heat storage tank 10, a second heat storage chamber 21 is formed in the second heat storage tank 20, a first heat supply nozzle 30 is arranged on the first heat storage tank 10, and a second heat supply nozzle 40 is arranged on the second heat storage tank 20; a circulation pipeline communicating the first heat storage tank 10, the second heat storage tank 20 and the scrap hopper 60, wherein the circulation pipeline is divided into a high-temperature flue gas pipeline and a low-temperature flue gas pipeline, the high-temperature flue gas pipeline is a pipeline for conveying high-temperature flue gas, and the low-temperature flue gas pipeline is a pipeline for conveying low-temperature flue gas; and a plurality of directional control valves disposed on the circulation line; the first heat storage box 10 and the second heat storage box 20 are located on two sides of the waste steel hopper 60, as shown in fig. 1, an induced draft fan 50 is further disposed on the circulation pipeline and used for pressurizing and conveying the low-temperature flue gas cooled by the first heat storage chamber 11 of the first heat storage box 10 to the second heat storage chamber 21 of the second heat storage box 20 to be heated to a high-temperature state and then conveying the heated low-temperature flue gas to the waste steel hopper 60, and the induced draft fan 50 is disposed on the low-temperature flue gas pipeline, or as shown in fig. 2, an induced draft fan 50 is further disposed on the circulation pipeline and used for pressurizing and conveying the low-temperature flue gas cooled by the second heat storage chamber 21 of the second heat storage box 20 to the first heat storage chamber 11 of the first heat storage box 10 to be heated to a high-temperature state and then conveying the heated low-temperature flue gas to the waste steel hopper 60; when the heat-storage type gas-fired boiler is in the working state as shown in fig. 1, at this time, the first heat supply burner 30 is in a combustion state, the first regenerator 11 is in a heat-storage state, the second heat supply burner 40 is in an extinction state, the second regenerator 21 is in a heat-release state, and high-temperature flue gas generated by the first heat supply burner 30 is cooled by the first regenerator 11 to be low-temperature flue gas, because the first regenerator 11 in the heat-storage state can rapidly absorb heat so as to convert the high-temperature flue gas into low-temperature flue gas, the induced draft fan 50 pressurizes the low-temperature flue gas cooled by the first regenerator 11 into the second regenerator 21 to heat the high-temperature flue gas, and the second regenerator 21 can heat the low-temperature flue gas because: the second regenerator 21 is in a heat release state, and can rapidly release heat to heat low-temperature flue gas so as to convert the low-temperature flue gas into high-temperature flue gas, and the induced draft fan 50 sends the high-temperature flue gas to the waste steel hopper 60; when the heat exchanger is in the working state as shown in fig. 2, at this time, the first heat supply nozzle 30 is in an extinction state, the first regenerator 11 is in a heat release state, the second heat supply nozzle 40 is in a combustion state, the second regenerator 21 is in a heat storage state, and the high-temperature flue gas generated by the second heat supply nozzle 40 is cooled by the second regenerator 21 to be low-temperature flue gas, because the second regenerator 21 in the heat storage state can quickly absorb heat so as to convert the high-temperature flue gas into low-temperature flue gas, the induced draft fan 50 pumps the low-temperature flue gas cooled by the second regenerator 21 into the first regenerator 11 to heat the high-temperature flue gas, and the first regenerator 11 can heat the low-temperature flue gas because: first regenerator 11 is in exothermic state, can release heat fast and be used for heating low temperature flue gas so that low temperature flue gas changes high temperature flue gas into, and in this scheme, first regenerator 11 is opposite with the operating condition of second regenerator 21.
As an embodiment of this embodiment, the first heat storage tank 10 and the second heat storage tank 20 have the same structure, and now the internal structure of the heat storage tank is described specifically by taking the first heat storage tank 10 as an example, as shown in fig. 3, the first heat storage chamber 11 is formed in the middle of the first heat storage tank 10, the combustion chamber 12 communicated with the first heat storage chamber 11 is formed in the upper portion of the first heat storage tank 10, the buffer chamber 13 communicated with the first heat storage chamber 11 for buffering low-temperature gas to be sucked by the induced draft fan 50 is formed in the lower portion of the first heat storage tank 10, wherein the combustion chamber 12 is connected to the first heat supply burner 30, and the air flow in the first heat storage tank 10 flows up and down.
As an embodiment of the present embodiment, the first regenerator 11 and the second regenerator 21 have the same structure, and now the first regenerator 11 is taken as an example for description, as shown in fig. 3, the first regenerator 11 includes a plurality of heat accumulators 111, a steel grid 112 fixedly disposed below the heat accumulators 111 for supporting the heat accumulators 111, and a brick 113 disposed above the heat accumulators 111 for protecting the heat accumulators; in this scheme, when first heat supply nozzle 30 is in the combustion state, first heat supply nozzle 30 is in produce the high temperature flue gas in combustion chamber 12, the high temperature flue gas process during first regenerator 11, the heat accumulator in the first regenerator 11 absorbs the heat of high temperature flue gas, keeps the heat of high temperature flue gas in first regenerator 11, first regenerator 11 is in the heat accumulation state, at this moment, be low temperature flue gas in the buffer 13.
As an embodiment of the present scheme, as shown in fig. 3, the heat accumulator 111 is an aluminum heat accumulation ball, a plurality of the aluminum heat accumulation balls can divide an air flow into small air flow channels, and when flue gas passes through the heat accumulator 111, a strong turbulent flow region can be formed, so that the flue gas can effectively impact the heat accumulator 111, thereby realizing heat transportation.
As an example of this solution, as shown in fig. 3, the diameter of the heat storage body 111 has a range of: 15-25 mm, and when the diameter of the heat accumulator 111 is in the range, the heat accumulator 111 has the advantages of proper heat transfer radius, small heat resistance, high density and good heat conductivity.
As an example of this solution, as shown in fig. 3, the diameter of the heat accumulator 111 is 20mm, and the diameter of the heat accumulator 111 cannot be too large or too small, because the heat accumulator 111 that is too large or too small cannot achieve good heat transfer and heat conduction effects.
As an example of this embodiment, as shown in fig. 3, the distribution height of the heat storage body 111 in the up and down direction has a range: 400-600 mm, when the distribution height of the heat accumulator 111 is in the range, the first heat accumulation chamber 11 can better cool the high-temperature flue gas or heat the low-temperature flue gas.
In one embodiment of this embodiment, the distribution height of the heat storage bodies in the up-down direction is 500 mm.
As an embodiment of the present solution, as shown in fig. 1 and fig. 2, the reversing valve includes a first high temperature flue gas reversing valve 611, a second high temperature flue gas reversing valve 621, a first low temperature flue gas reversing valve 631, a second low temperature flue gas reversing valve 641, a third low temperature flue gas reversing valve 651, and a fourth low temperature flue gas reversing valve 661, the circulating pipeline includes a first high temperature flue gas pipeline 61 provided with the first high temperature flue gas reversing valve 611, a second high temperature flue gas pipeline 62 provided with the second high temperature flue gas reversing valve 621, a first low temperature flue gas pipeline 63 provided with the first low temperature flue gas reversing valve 631, a second low temperature flue gas pipeline 64 provided with the second low temperature flue gas reversing valve 641, a third low temperature flue gas pipeline 65 provided with the third low temperature flue gas reversing valve 651, a fourth low temperature flue gas pipeline 66 provided with the fourth low temperature flue gas reversing valve 661, wherein, a tip of first high temperature flue gas pipeline 61 communicates combustor, another tip intercommunication of first regenerator box 10 scrap hopper 60, a tip of second high temperature flue gas pipeline 62 communicates combustor, another tip intercommunication of second regenerator box 20 scrap hopper 60, a tip of first low temperature flue gas pipeline 63 with air intake intercommunication, another tip of draught fan 50 with the surge chamber intercommunication of first regenerator box 10, a tip of second low temperature flue gas pipeline 64 with air intake intercommunication, another tip of draught fan 50 with the surge chamber intercommunication of second regenerator box 20, a tip of third low temperature flue gas pipeline 65 with air outlet intercommunication, another tip with the surge chamber intercommunication of first regenerator box 10 of draught fan 50, a tip of fourth low temperature flue gas pipeline 66 with the air outlet intercommunication of draught fan 50, another tip of second low temperature flue gas pipeline 65, The other end communicates with the buffer chamber of the second heat storage tank 20; in this scheme, draught fan 50 sets up on low temperature flue gas pipeline, can effectual extension draught fan 50's life to prolonged whole flue gas circulation system's life, avoided frequent maintenance, the effectual use cost that has practiced thrift.
As an embodiment of the present disclosure, the first low-temperature flue gas pipeline 63, the second low-temperature flue gas pipeline 64, the third low-temperature flue gas pipeline 65, and the fourth low-temperature flue gas pipeline 66 adopt carbon steel pipes, and the first high-temperature flue gas pipeline 61 and the second high-temperature flue gas pipeline 62 adopt carbon steel pipes and linings.
As an embodiment of this scheme, the first high temperature flue gas change-over valve 611, the second high temperature flue gas change-over valve 621, the first low temperature flue gas change-over valve 631, the second low temperature flue gas change-over valve 641, the third low temperature flue gas change-over valve 651, and the fourth low temperature flue gas change-over valve 661 all adopt pneumatic airtight butterfly valves.
While the embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application suitable for this invention, and further modifications may be readily made by those skilled in the art, and the invention is therefore not limited to the specific details and illustrations shown and described herein, without departing from the general concept defined by the claims and their equivalents.
Claims (10)
1. A flue gas recirculation system, comprising:
a pair of heat storage tanks having heat storage chambers built therein;
the circulating pipeline is communicated with the heat storage box at one side, the heat storage box at the other side and a waste steel hopper (60), and is divided into a high-temperature flue gas pipeline and a low-temperature flue gas pipeline; and
a plurality of directional control valves disposed on the circulation line;
the circulating pipeline is also provided with an induced draft fan (50) which is used for pressurizing and conveying the low-temperature flue gas cooled by the heat storage chamber of the heat storage box at one side to the heat storage chamber of the heat storage box at the other side, heating the low-temperature flue gas to a high-temperature state and then conveying the high-temperature flue gas to the waste steel hopper (60), and the induced draft fan (50) is arranged on the low-temperature flue gas pipeline.
2. The flue gas circulation system of claim 1, wherein the heat storage tank is provided with heat supply burners.
3. The flue gas circulation system of claim 1, wherein the regenerator is formed in the middle of the regenerator, the upper part of the regenerator is a combustion chamber communicated with the regenerator, and the lower part of the regenerator is a buffer chamber communicated with the regenerator for buffering low-temperature gas to be sucked away by the induced draft fan (50), wherein the gas flow in the regenerator flows up and down.
4. The flue gas recirculation system of claim 1, wherein the regenerator comprises a plurality of thermal masses, a steel grid fixedly disposed below the thermal masses for supporting the thermal masses, and bricks disposed above the thermal masses for protecting the thermal masses.
5. The flue gas recirculation system of claim 4, wherein the heat accumulator is an aluminum heat accumulation ball.
6. The flue gas recirculation system of claim 4, wherein the heat accumulator diameter is in the range of: 15-25 mm.
7. The flue gas circulation system according to claim 4, wherein the distribution height of the heat storage body in the up and down direction is in the range of: 400-600 mm.
8. The flue gas circulation system according to claim 7, wherein the distribution height of the heat storage bodies in the up and down direction is 500 mm.
9. The flue gas circulation system according to claim 2, wherein the reversing valve comprises a first high-temperature flue gas reversing valve (611), a second high-temperature flue gas reversing valve (621), a first low-temperature flue gas reversing valve (631), a second low-temperature flue gas reversing valve (641), a third low-temperature flue gas reversing valve (651) and a fourth low-temperature flue gas reversing valve (661), and the circulation pipeline comprises a first high-temperature flue gas pipeline (61) provided with the first high-temperature flue gas reversing valve (611), a second high-temperature flue gas pipeline (62) provided with the second high-temperature flue gas reversing valve (621), a first low-temperature flue gas pipeline (63) provided with the first low-temperature flue gas reversing valve (631), a second low-temperature flue gas pipeline (64) provided with the second low-temperature flue gas reversing valve (641), a third low-temperature flue gas pipeline (65) provided with the third low-temperature flue gas reversing valve (651), A fourth low temperature flue gas pipeline (66) that is provided with fourth low temperature flue gas switching-over valve (661), wherein, a tip of first high temperature flue gas pipeline (61) communicates the combustion chamber of one side regenerator, another tip intercommunication scrap steel hopper (60), a tip of second high temperature flue gas pipeline (62) communicates the combustion chamber of opposite side regenerator, another tip intercommunication scrap steel hopper (60), a tip of first low temperature flue gas pipeline (63) with the air intake intercommunication of draught fan (50), another tip and the surge chamber intercommunication of one side regenerator, a tip of second low temperature flue gas pipeline (64) with the air intake intercommunication of draught fan (50), another tip and the surge chamber intercommunication of opposite side regenerator, a tip of third low temperature flue gas pipeline (65) with the air outlet intercommunication of draught fan (50), The other end of the second low-temperature flue gas pipeline is communicated with the buffer chamber of the heat storage box at one side, and one end of the fourth low-temperature flue gas pipeline (66) is communicated with the air outlet of the draught fan (50) and the other end of the fourth low-temperature flue gas pipeline is communicated with the buffer chamber of the heat storage box at the other side.
10. The flue gas recirculation system of claim 9, wherein the first low temperature flue gas duct (63), the second low temperature flue gas duct (64), the third low temperature flue gas duct (65) and the fourth low temperature flue gas duct (66) are carbon steel tubes, and the first high temperature flue gas duct (61) and the second high temperature flue gas duct (62) are lined with carbon steel tubes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921450291.9U CN210426131U (en) | 2019-09-03 | 2019-09-03 | Flue gas circulating system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921450291.9U CN210426131U (en) | 2019-09-03 | 2019-09-03 | Flue gas circulating system |
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| CN210426131U true CN210426131U (en) | 2020-04-28 |
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| CN201921450291.9U Active CN210426131U (en) | 2019-09-03 | 2019-09-03 | Flue gas circulating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110425894A (en) * | 2019-09-03 | 2019-11-08 | 苏州正益诚新能源科技有限公司 | A kind of smoke circulating system |
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2019
- 2019-09-03 CN CN201921450291.9U patent/CN210426131U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110425894A (en) * | 2019-09-03 | 2019-11-08 | 苏州正益诚新能源科技有限公司 | A kind of smoke circulating system |
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