CN211177993U - Heat accumulating type heating furnace flue gas reverse purging system - Google Patents
Heat accumulating type heating furnace flue gas reverse purging system Download PDFInfo
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- CN211177993U CN211177993U CN201922101702.XU CN201922101702U CN211177993U CN 211177993 U CN211177993 U CN 211177993U CN 201922101702 U CN201922101702 U CN 201922101702U CN 211177993 U CN211177993 U CN 211177993U
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Abstract
The utility model discloses a flue gas back-flushing system of a regenerative heating furnace, which comprises a heating furnace, a gas main pipe and a primary flue gas main pipe; the back-blowing smoke main pipe is connected with a heating furnace burner through a back-blowing smoke branch pipe, and the coal gas reversing valve is arranged on the back-blowing smoke branch pipe; the primary flue gas main pipe is connected with a primary flue gas induced draft fan, and the primary flue gas induced draft fan is connected with a chimney through a smoke exhaust pipe; the back-blowing flue gas main pipe is connected with a back-blowing flue gas induced draft fan, the back-blowing flue gas induced draft fan is connected with a smoke exhaust pipe through a connecting pipe, and a back-blowing flue gas storage tank is arranged on the connecting pipe. The heat accumulating type heating furnace flue gas back purging system and the method are used for solving the problems of pressure fluctuation of a back purging flue gas pipeline and easy blockage of a heat accumulator, so that the efficiency and the stability of the flue gas back purging process are improved.
Description
Technical Field
The utility model relates to an industrial furnace kiln energy-concerving and environment-protective technical field, concretely relates to anti-purging system of regenerative heating furnace flue gas.
Background
The double heat accumulating type heating furnace adopts the mode of alternate combustion and smoke exhaust on two sides of the heating furnace to supply heat to the furnace, and realizes the switching of air supply and air exhaust functions of the same burner by controlling the closing and opening of the reversing valve. When the combustion technology is reversed, gas is still filled in the space of the burner and the pipeline between the burner and the reversing valve due to the existence of residual pressure of the gas at the moment that the gas reversing valve is changed from gas supply to gas extraction, the gas is instantaneously combusted with the residual oxygen in the high-temperature flue gas entering the burner after reversing, and the phenomena of burning, adhesion corrosion, cracking, deformation, pore blockage and the like can occur to a heat accumulator in the burner under the high temperature of flame, so that the heat accumulation capacity is reduced.
In order to solve the problems, a smoke back-blowing system is additionally arranged on some heating furnaces, low-temperature smoke is extracted from a smoke main pipe through a newly-added draught fan, so that residual coal gas in a pipeline is replaced into the furnace to be combusted, the secondary combustion phenomenon in a coal gas burner is avoided, the technology can achieve the purpose of improving the working condition of a heat accumulator, but the fluctuation of pressure in the pipeline can be increased, in addition, a certain amount of dust and iron oxide particles are contained in the smoke, the smoke replaces the coal gas into the furnace, the smoke is temporarily stopped in the heat accumulator, after a coal gas reversing valve turns to exhaust, high-temperature smoke enters the heat accumulator instantly and is mixed with the smoke originally stopped in the heat accumulator, the dust and the particles are melted and adhered to the heat accumulator, the heat accumulator can be blocked for a long time, and the heat accumulation capacity of.
Disclosure of Invention
The utility model provides a solve above-mentioned problem, provide a system is swept to regenerative heating furnace flue gas blowback for improve the pressure oscillation of blowback flue gas pipeline and the easy problem of blockking up of heat accumulator, thereby improve the high efficiency and the stability of flue gas blowback process, its concrete technical scheme as follows:
a regenerative heating furnace flue gas blowback system includes:
the heating furnace comprises two burners for entering and exhausting gas and discharging flue gas;
the gas main pipe is used for conveying gas and is connected with a gas reversing valve through a gas branch pipe;
the primary flue gas main pipe is used for conveying flue gas and is connected with a gas reversing valve through a primary flue gas branch pipe;
the gas reversing valve is used for switching pipelines, is connected with a burner of the heating furnace, and is used for switching the connection of the burner of the heating furnace and a gas branch pipe or a primary flue gas branch pipe;
the back-blowing smoke main pipe is connected with a heating furnace burner through a back-blowing smoke branch pipe, and the coal gas reversing valve is arranged on the back-blowing smoke branch pipe;
the primary flue gas main pipe is connected with a primary flue gas induced draft fan, and the primary flue gas induced draft fan is connected with a chimney through a smoke exhaust pipe; the back-blowing flue gas main pipe is connected with a back-blowing flue gas draught fan, the back-blowing flue gas draught fan is connected with a smoke exhaust pipe through a connecting pipe, and a back-blowing flue gas storage tank is arranged on the connecting pipe.
As an improvement of the scheme, a back-blowing smoke fast-cutting valve and a check valve are arranged on the back-blowing smoke branch pipe.
As an improvement of the scheme, a flue gas dust remover is arranged on a connecting pipe between the back-blowing flue gas induced draft fan and the back-blowing flue gas storage tank.
As an improvement of the scheme, a primary flue gas quick-cutting valve A is arranged on the smoke exhaust pipe; and a primary flue gas quick-cutting valve B is arranged on a connecting pipe between the back-blowing flue gas storage tank and the smoke exhaust pipe.
A heating furnace flue gas back blowing method implemented by using the heat accumulating type heating furnace flue gas back blowing system comprises the following steps:
a. an air intake period: one of the burners is connected with a gas reversing valve, and the other gas reversing valve is switched to be communicated with a gas main pipe, so that gas enters a hearth of the heating furnace to be combusted;
b. and (3) exhausting period: b, switching the coal gas reversing valve closed in the step a to be communicated with the primary flue gas branch pipe, and discharging flue gas in the furnace;
c. reverse purging: closing the gas reversing valve communicated with the gas main pipe in the step a, simultaneously starting a back-blowing smoke induced draft fan, leading out smoke in a smoke gas storage tank, replacing residual gas in the gas reversing valve communicated with the gas main pipe in the step a into a hearth of a heating furnace, and then closing the induced draft fan;
d. and (c) repeating the steps a to c, and alternately using two burners to introduce the coal gas into the hearth of the heating furnace in the gas inlet period.
As an improvement of the scheme, before the step a begins, the primary flue gas quick-cutting valve A is closed, the primary flue gas quick-cutting valve B is opened, the flue gas in the primary flue gas header pipe flows into the back-blowing flue gas storage tank under the action of the draught fan, when the pressure in the storage tank reaches a set value, the primary flue gas quick-cutting valve B is closed, the primary flue gas quick-cutting valve A is opened, and the flue gas is subjected to environmental protection treatment and then is discharged through a chimney.
Compared with the prior art, the utility model adopts the above technical scheme, the technical effect who has is:
1) the utility model discloses a heat accumulating type heating furnace flue gas back purging system and method, which introduces a back-blowing flue gas header pipe, improves the problems of pressure fluctuation of a back-blowing flue gas pipeline and easy blockage of a heat accumulator, thereby improving the high efficiency and stability of the flue gas back purging process;
2) the utility model discloses a heat accumulation formula heating furnace flue gas anti-purging system and method has added blowback flue gas holder in the system, has effectively avoided the pressure fluctuation that two draught fans simultaneous working caused in the flue gas pipeline, has improved the stability of system operation.
3) The utility model discloses a heat accumulation formula heating furnace flue gas anti-purging system and method has increased flue gas dust collecting equipment in the blowback flue gas pipeline, has reduced dust and particulate matter content in the blowback flue gas to reduce the jam damage to heat accumulator in the coal gas nozzle, improved the life of heat accumulator.
Drawings
FIG. 1 is a schematic structural view of a flue gas back purging system of the regenerative heating furnace;
FIG. 2 is a schematic view of a connection structure of the primary flue gas main pipe and the back-blowing flue gas main pipe;
reference numerals: 1. a hearth; 2. burning a nozzle; 3. back flushing the flue gas main pipe; 301. back-blowing the flue gas branch pipe; 4. a primary flue gas main pipe; 401. a primary flue gas branch pipe; 5. a gas main pipe; 501. a gas branch pipe; 6. a gas reversing valve; 601. a flue gas side; 602. a gas side; 7. a back-blowing smoke fast-cutting valve; 8. a check valve; 9. a chimney; 10. a smoke exhaust pipe; 11. a primary flue gas induced draft fan; 12. a primary flue gas quick-cutting valve A; 13. a back-blowing smoke gas storage tank; 14. a connecting pipe; 15. a flue gas dust remover; 16. a back-blowing smoke induced draft fan; 17. a primary flue gas quick-cutting valve B.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout.
As shown in fig. 1, a back-flushing system for flue gas of a regenerative heating furnace comprises:
the heating furnace comprises two burners 2 for entering and exhausting gas and discharging flue gas;
the gas main pipe 5 is used for conveying gas, and the gas main pipe 5 is connected with a gas reversing valve 6 through a gas branch pipe 501;
the primary flue gas main pipe 4 is used for conveying flue gas, and the primary flue gas main pipe 4 is connected with a coal gas reversing valve 6 through a primary flue gas branch pipe 401;
the gas reversing valve 6 is used for switching pipelines, the gas reversing valve 6 is connected with the heating furnace burner 2, and the heating furnace burner 2 is switched to be connected with the gas branch pipe 501 or the primary flue gas branch pipe 401 through the gas reversing valve 6
The back-blowing flue gas main pipe 3 is connected with the heating furnace burner 2 through the back-blowing flue gas branch pipe 301, the coal gas reversing valve 6 is arranged on the back-blowing flue gas branch pipe 301, and the back-blowing flue gas fast-cutting valve 7 and the check valve 8 are arranged on the back-blowing flue gas branch pipe 301.
As shown in fig. 2, the primary flue gas header pipe 4 is connected with a primary flue gas induced draft fan 11, and the primary flue gas induced draft fan 11 is connected with a chimney 9 through a smoke exhaust pipe 10; the back-blowing flue gas main pipe 3 is connected with a back-blowing flue gas induced draft fan 16, the flue gas induced draft fan is connected with a smoke exhaust pipe 10 through a connecting pipe 14, and a back-blowing flue gas storage tank 13 is arranged on the connecting pipe 14. A flue gas dust remover 15 is arranged on a connecting pipe 14 between a back-blowing flue gas induced draft fan 16 and a back-blowing flue gas storage tank 13. The smoke exhaust pipe 10 is provided with a primary smoke fast-cutting valve A12; a primary flue gas fast-cutting valve B17 is arranged on each connecting pipe 14 between the back-blowing flue gas storage tank 13 and the smoke exhaust pipe 10.
A heating furnace flue gas back blowing method implemented by utilizing the heat accumulating type heating furnace flue gas back blowing system comprises the following steps:
a. an air intake period: one of the burners 2 is connected with the gas reversing valve 6 and is closed, and the other gas reversing valve 6 is switched to be communicated with the gas main pipe 5, so that the gas enters the hearth 1 of the heating furnace to be combusted;
b. and (3) exhausting period: b, switching the coal gas reversing valve 6 closed in the step a to be communicated with the primary flue gas branch pipe 401, and discharging flue gas in the furnace;
c. reverse purging: closing the gas reversing valve 6 communicated with the gas main pipe 5 in the step a, simultaneously starting a back-blowing flue gas induced draft fan 16, leading out the flue gas in the flue gas storage tank, replacing the residual gas in the gas reversing valve 6 communicated with the gas main pipe 5 in the step a into the hearth 1 of the heating furnace, and then closing the induced draft fan;
d. and (c) repeating the steps a to c, and alternately using two burners 2 to introduce gas into the hearth 1 of the heating furnace in the gas inlet period.
Before the step a begins, a primary flue gas quick-switching valve A12 is closed, a primary flue gas quick-switching valve B17 is opened, flue gas in a primary flue gas header pipe 4 flows into a back-blowing flue gas storage tank 13 under the action of a draught fan, when the pressure in the storage tank reaches a set value, a primary flue gas quick-switching valve B17 is closed, a primary flue gas quick-switching valve A12 is opened, and the flue gas is subjected to environmental protection treatment and then is discharged through a chimney 9.
Taking a specific using process of the heating furnace as an example, the reversing period of the used regenerative heating furnace is 60s, and the operation process in one reversing period is taken as a representative example, and a specific implementation mode of the flue gas back flushing method is explained. As shown in fig. 1, in a certain reversing period, the left side of the heating furnace is an air inlet side, and coal gas and air enter the furnace through a coal gas reversing valve 6 and a burner 2 on the left side to be combusted; the right side is a smoke exhaust side, when the reversing period is finished for 60s, the right burner 2 and the gas reversing valve 6 keep a smoke exhaust state, the left gas reversing valve 6 is closed after continuously keeping an air inlet state for 2s, the valve clack of the gas side 602 of the left gas reversing valve 6 is closed, the supply of gas into the furnace is stopped, the back-blowing gas induced draft fan 16 is opened, the gas in the back-blowing gas storage tank 13 is led out and sent to the gas reversing valve 6 on the left side of the heating furnace, all the gas remained in the gas reversing valve 6 and the gas burner 2 is replaced into the furnace, and the back-blowing gas induced draft fan 16 is closed after 4 s. And then entering the next reversing period, converting the right gas reversing valve 6 and the burner 2 into inlet gas, and converting the left burner 2 and the reversing valve into exhaust gas, and circulating the processes.
When each reversing period starts, the primary flue gas quick-switching valve A12 is closed, the primary flue gas quick-switching valve B17 is opened, the flue gas in the primary flue gas header pipe 4 flows into the back-blowing flue gas storage tank 13 under the action of the induced draft fan, when the pressure in the storage tank reaches a set value, the primary flue gas quick-switching valve B17 is closed, the primary flue gas quick-switching valve A12 is opened, the flue gas is discharged through the chimney 9 after being subjected to environmental protection treatment, and the process is circulated again until the next reversing period.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention.
Claims (4)
1. A regenerative heating furnace flue gas blowback system includes:
the heating furnace comprises two burners for entering and exhausting gas and discharging flue gas;
the gas main pipe is used for conveying gas and is connected with a gas reversing valve through a gas branch pipe;
the primary flue gas main pipe is used for conveying flue gas and is connected with a gas reversing valve through a primary flue gas branch pipe;
the gas reversing valve is used for switching pipelines, is connected with a burner of the heating furnace, and is used for switching the connection of the burner of the heating furnace and a gas branch pipe or a primary flue gas branch pipe;
the method is characterized in that:
the back-blowing smoke main pipe is connected with a heating furnace burner through a back-blowing smoke branch pipe, and the coal gas reversing valve is arranged on the back-blowing smoke branch pipe;
the primary flue gas main pipe is connected with a primary flue gas induced draft fan, and the primary flue gas induced draft fan is connected with a chimney through a smoke exhaust pipe; the back-blowing flue gas main pipe is connected with a back-blowing flue gas draught fan, the back-blowing flue gas draught fan is connected with a smoke exhaust pipe through a connecting pipe, and a back-blowing flue gas storage tank is arranged on the connecting pipe.
2. A regenerative heating furnace flue gas blowback system as set forth in claim 1 wherein said blowback flue gas branch pipe is provided with a blowback flue gas quick-cut valve and a check valve.
3. The system of claim 2, wherein a flue gas dust collector is disposed on the connecting pipe between the back-blowing flue gas induced draft fan and the back-blowing flue gas storage tank.
4. A regenerative heating furnace flue gas blowback system as set forth in claim 3 wherein said flue gas discharge pipe is provided with a primary flue gas quick-cut valve a; and a primary flue gas quick-cutting valve B is arranged on a connecting pipe between the back-blowing flue gas storage tank and the smoke exhaust pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922101702.XU CN211177993U (en) | 2019-11-29 | 2019-11-29 | Heat accumulating type heating furnace flue gas reverse purging system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922101702.XU CN211177993U (en) | 2019-11-29 | 2019-11-29 | Heat accumulating type heating furnace flue gas reverse purging system |
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| CN211177993U true CN211177993U (en) | 2020-08-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110849163A (en) * | 2019-11-29 | 2020-02-28 | 张家港宏昌钢板有限公司 | Regenerative heating furnace flue gas reverse purging system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110849163A (en) * | 2019-11-29 | 2020-02-28 | 张家港宏昌钢板有限公司 | Regenerative heating furnace flue gas reverse purging system and method |
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