CN211781118U - In-furnace flue gas recirculation system - Google Patents
In-furnace flue gas recirculation system Download PDFInfo
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- CN211781118U CN211781118U CN201922246703.3U CN201922246703U CN211781118U CN 211781118 U CN211781118 U CN 211781118U CN 201922246703 U CN201922246703 U CN 201922246703U CN 211781118 U CN211781118 U CN 211781118U
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- flue gas
- hearth
- cyclone separator
- recirculation system
- induced draft
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Abstract
The utility model relates to a waste incineration exhaust-heat boiler. The purpose is to provide a flue gas recirculation system in the stove, and the system should have the characteristics that the discharge of flue gas volume is few, work efficiency is high. The technical scheme is as follows: the in-furnace flue gas recirculation system comprises a hearth and two secondary air outlets arranged on a front arch and a rear arch of the hearth; the method is characterized in that: the system also includes a cyclone separator; a circulating flue gas induced draft port is arranged on the rear wall of the hearth; the circulating flue gas induced draft port is communicated with an air inlet of the cyclone separator through an induced draft pipe, and an air outlet of the cyclone separator is simultaneously communicated with two secondary air outlets through a recirculation air pipe.
Description
Technical Field
The utility model relates to a waste incineration exhaust-heat boiler specifically is a recirculation system in flue gas stove.
Background
With the progress of society, the larger incineration boilers for performing harmless treatment on garbage are, and the more important the control of the efficiency and cost of the boilers is. How to maximize the efficiency while increasing the boiler efficiency and minimizing the cost in a large scale requires innovative design in the design of the boiler.
Due to the requirements of anticorrosion and tail gas treatment processes, the temperature of the boiler exhaust gas is generally kept above 180 ℃, the factor influencing the efficiency of the boiler is heat loss, the main part of the heat loss is heat taken away by the boiler exhaust gas, the heat cannot be utilized, and the method can only be realized in the direction of reducing the amount of the exhaust gas in order to reduce the heat loss of the exhaust gas.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming not enough among the above-mentioned background art, providing an IGR recirculation system, this system should have the characteristics that the discharge of flue gas volume is few, work efficiency is high.
The technical scheme of the utility model is that:
the in-furnace flue gas recirculation system comprises a hearth and two secondary air outlets arranged on a front arch and a rear arch of the hearth; the method is characterized in that: the system also includes a cyclone separator; a circulating flue gas induced draft port is arranged on the rear wall of the hearth; the circulating flue gas induced draft port is communicated with an air inlet of the cyclone separator through an induced draft pipe, and an air outlet of the cyclone separator is simultaneously communicated with two secondary air outlets through a recirculation air pipe.
The circulating flue gas is directly led out from the hearth, and the circulating flue gas air-inducing port is arranged at the upper part of the rear wall of the hearth.
The hearth front arch, the hearth rear arch and the hearth side wall are water-cooled walls.
The utility model has the advantages that:
the utility model provides a IGR (flue gas recirculation in stove) recirculation system, can take the flue gas out from the furnace rear portion, pour into furnace into again for the overgrate air after cyclone tentatively takes off dirt, the flue gas of recirculation has replaced original overgrate air in this flow, thereby the air quantity that gets into furnace has been reduced, and then the production of flue gas has been reduced, the abundant burning of rubbish has still been guaranteed simultaneously, the calorific loss of taking away is discharged fume has been reduced, the efficiency of boiler has been improved, the reduction of flue gas also makes follow-up tail gas treatment equipment's scale also corresponding reduction, be favorable to controlling economic cost.
Drawings
Fig. 1 is a schematic view of the structure of the present invention.
Detailed Description
The present invention will be further described with reference to the drawings attached to the specification, but the present invention is not limited to the following embodiments.
As shown in fig. 1, the in-furnace flue gas recirculation system comprises a furnace 1, two secondary air outlets 2 arranged on a front arch and a rear arch of the furnace, a cyclone separator 3, a circulating flue gas outlet 4 arranged on a rear wall of the furnace, an induced duct 5 and a recirculation duct 6.
The hearth comprises a hearth front arch 1.1, a hearth rear arch 1.2, a hearth side wall 1.4 and a hearth rear wall. The hearth front arch, the hearth rear arch and the hearth side wall are water-cooled walls. Because the utility model discloses can reduce the flue gas volume, improve the flue gas temperature, and adopt the water-cooling wall can control furnace heat load to the solution expansion problem.
The circulating flue gas outlet is arranged at the upper part of the rear wall of the hearth. The circulating flue gas outlet is communicated with an air inlet 3.1 of the cyclone separator through an induced air pipe, and an air outlet 3.2 of the cyclone separator is simultaneously communicated with two secondary air outlets through a recirculation air pipe.
Preferably, the secondary air outlet is a wear-resistant and corrosion-resistant silicon carbide nozzle. Because the recirculated flue gas temperature that injects into furnace again through the overgrate air outlet is high, the dust content is big, the velocity of flow is fast, therefore operating condition is abominable, adopts this nozzle can guarantee that entire system reliably moves.
The utility model discloses in, after the high temperature flue gas in the furnace cools off 220 ℃ through each water-cooling wall of furnace, some flue gas is discharged from flue gas mouth 1.9, and another part flue gas is introduced cyclone via the induced duct from furnace back wall, and cyclone separates to fall and introduces furnace by the recirculation air duct after the flying ash in, has realized the flue gas recirculation in the stove, has reduced the flue gas volume that the boiler discharged, has realized improving boiler efficiency and cost control's benefit maximize.
The above description is only a preferred embodiment of the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The in-furnace flue gas recirculation system comprises a hearth (1) and two secondary air outlets (2) arranged on a front arch and a rear arch of the hearth; the method is characterized in that: the system further comprises a cyclone separator (3); and a circulating flue gas induced draft opening (4) is formed in the rear wall (1.3) of the hearth, the circulating flue gas induced draft opening is communicated with an air inlet of the cyclone separator through an induced draft pipe (5), and an air outlet of the cyclone separator is simultaneously communicated with two secondary air outlets through a recirculation air pipe (6).
2. The in-furnace flue gas recirculation system of claim 1, wherein: the circulating flue gas is directly led out from the hearth, and the circulating flue gas air-inducing port is arranged at the upper part of the rear wall of the hearth.
3. The in-furnace flue gas recirculation system of claim 2, characterized in that: the hearth front arch (1.1), the hearth rear arch (1.2) and the hearth side wall (1.4) are water-cooled walls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922246703.3U CN211781118U (en) | 2019-12-13 | 2019-12-13 | In-furnace flue gas recirculation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922246703.3U CN211781118U (en) | 2019-12-13 | 2019-12-13 | In-furnace flue gas recirculation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211781118U true CN211781118U (en) | 2020-10-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922246703.3U Active CN211781118U (en) | 2019-12-13 | 2019-12-13 | In-furnace flue gas recirculation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211781118U (en) |
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2019
- 2019-12-13 CN CN201922246703.3U patent/CN211781118U/en active Active
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