CN212961550U - Adjustable box boiler heat transfer structure - Google Patents
Adjustable box boiler heat transfer structure Download PDFInfo
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- CN212961550U CN212961550U CN202021546177.9U CN202021546177U CN212961550U CN 212961550 U CN212961550 U CN 212961550U CN 202021546177 U CN202021546177 U CN 202021546177U CN 212961550 U CN212961550 U CN 212961550U
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- flue
- recycling
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- heat transfer
- recirculation
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Abstract
The utility model relates to an adjustable box boiler heat transfer structure, its constitution includes: the recycling device comprises a recycling fan (1), a recycling flue (2), a sealed air duct (3) and a closing baffle (4), wherein the recycling fan is connected with the recycling flue, the closing baffle is installed at the inlet of the recycling fan, the sealed air duct is introduced at an air box at the inlet of the recycling flue, and a coal economizer (5) is connected with a hearth (6) through the recycling flue. The temperature of the flue gas in the furnace can be reduced, and the generation amount of NOx is reduced.
Description
The technical field is as follows:
the utility model relates to an adjustable box boiler heat transfer structure.
Background art:
the gas-fired boiler is designed with high efficiency, and radiation and convection heat exchange need to be reasonably distributed and reasonably arranged when a hearth is selected and a heating surface is arranged. However, when the boiler operates at low load, the flow of flue gas is less, the heat absorption of the convection heating surface is reduced, the main steam parameter can be ensured by increasing the fuel quantity, the reheating steam is easy to have the phenomenon of under-temperature, the arrangement of flue gas recirculation can ensure the steam temperature of a reheater, and therefore the boiler can operate at high efficiency.
On the other hand, the variety of the coal gas generated in the production process of the iron and steel enterprises is considered, and the coal gas comprises blast furnace gas, converter gas and coke oven gas. Wherein the heat value of the blast furnace gas is about 750kcal/Nm3-wet, the heat value of the converter gas is about 1500kcal/Nm3-wet, and the heat value of the coke oven gas is about 3600kcal/Nm 3-wet. Along with the change of fuel, the flue gas volume changes along with it, and when using blast furnace gas, the flue gas volume is great, and the flue gas temperature is lower, and the proportion that convection heat transfer accounts for is great, and the reheater temperature also reaches. When blast furnace gas and coke oven gas are mixed to burn, the smoke gas amount is reduced, the smoke temperature is increased, the radiation heat exchange is enhanced, the convection heat exchange is insufficient, and the phenomenon of under-temperature is easy to occur in the reheater. While the amount of thermal NOx generation increases.
The reheater mode of adjusting temperature that gas boiler generally adopted at present is that the baffle adjusts the temperature, has following two defects: firstly, the temperature of a baffle is adjusted, only part of heating surfaces of a reheater participate in temperature adjustment, the temperature adjustment effect is poor, the adjustable range is narrow, and the effect of adjusting the convection-radiation heat exchange ratio cannot be realized; II, secondly: the temperature of the flue gas in the furnace can not be adjusted by adjusting the temperature of the baffle plate, and the aim of reducing NOx can not be fulfilled.
The invention content is as follows:
the utility model aims at providing an adjustable box boiler heat transfer structure can prevent that the fan from stopping the operation or high temperature flue gas from the anti cluster of furnace to the flue that recycles when the low frequency operation, goes into the export at recirculation fan and arranges and close the baffle, introduces sealed wind channel in recirculation entry bellows department simultaneously, plays the guard action to the fan.
The above purpose is realized by the following technical scheme:
an adjustable box boiler heat transfer structure, its constitution includes: the recycling fan is connected with the recycling flue, the closing baffle is installed at the inlet of the recycling fan, the sealed air channel is introduced into the air box at the inlet of the recycling flue, the coal economizer is connected with the hearth through the recycling flue, the inlet of the recycling flue is an economizer outlet flue, and the sealed air channel is introduced from a cold air channel.
The heat transfer structure of the adjustable box type boiler is characterized in that the circulating fan extracts flue gas from an outlet of the economizer and sends the flue gas into the hearth.
The adjustable box type boiler heat transfer structure is characterized in that: the recirculation fan adopts a floor arrangement structure.
The utility model has the advantages that:
1. the utility model discloses a mode of flue gas recirculation is adjusted the heat absorption proportion of radiation heat absorption and convective heat transfer. The method is characterized in that a certain amount of flue gas is extracted from an outlet of an economizer at a circulating fan and then is input into a hearth again, so that the temperature of the flue gas at the bottom of a screen is reduced, the radiation heat exchange is reduced, and the convection heat exchange is enhanced. Meanwhile, as a main temperature regulating means of the reheater, the temperature of the reheater can reach design parameters when the boiler operates at low load, and in addition, the method for regulating the heat transfer characteristic of the boiler can also reduce the generation of NOx and reduce the consumption of catalysts and reactants.
The utility model discloses a box gas boiler, this mode of adjusting the temperature, the temperature adjusting range is wide, and response speed is fast. The flue gas recirculation temperature regulation method can ensure that the radiation convection heat exchange can still keep reasonable distribution when the boiler operates at low load, ensure steam parameters and ensure the high-efficiency operation of the boiler. The invention is suitable for mixed combustion of different fuels, and can reduce the temperature of flue gas in the furnace and reduce the generation of NOx when high-calorific-value gas is mixed combusted.
The utility model discloses (1) recirculation fan falls to the ground and arranges, can greatly reduce the probability of fan vibration. (2) The inlet of the recirculation flue is an economizer outlet flue, and the inlet of the recirculation flue is the bottom of the hearth, so that the temperature of the flue gas can be reduced more effectively. (3) The sealed air duct is introduced from the cold air duct, and sealed air is put into operation when the fan stops operating or operates at low frequency, so that the safety of the recirculation flue and the fan can be guaranteed. (4) The closing baffle plate is arranged in a flue with the inlet and the outlet of the fan, so that smoke can be prevented from entering the fan, and the safe operation and the maintenance without stopping the furnace of the fan are ensured.
Description of the drawings:
fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a partially enlarged view of fig. 1.
In the figure: 1. the system comprises a recirculation fan, 2, a recirculation flue, 3, a sealed air channel, 4, a closing baffle, 5, an economizer, 6, a hearth, 7, a furnace right hot air outlet, 8, a furnace left hot air outlet, 9, a furnace left cold air inlet, 10 and a furnace right cold air inlet.
The specific implementation mode is as follows:
example 1:
an adjustable box boiler heat transfer structure, its constitution includes: recirculation fan 1, recirculation flue 2, sealed wind channel 3, closing baffle 4, recirculation fan with recirculation flue connect, recirculation fan's entrance install closing baffle, recirculation flue entry bellows department introduce have sealed wind channel, pass through economizer 5 recirculation flue and furnace 6 are connected, recirculation flue entry be economizer export flue, sealed wind channel draw from cold air duct.
Example 2:
according to the heat transfer structure of the adjustable box type boiler in the embodiment 1, the circulating fan extracts flue gas from an economizer outlet and sends the flue gas into the hearth.
Example 3:
according to the heat transfer structure of the adjustable box type boiler in the embodiment 1 or 2, the recirculation fan is in a floor arrangement structure.
Example 4:
a certain amount of flue gas is extracted from the flue gas at the outlet of the economizer and then returns to the hearth through the recirculation flue, so that the temperature of the flue gas is reduced, the radiation heat absorption of a water-cooled wall is reduced, and the convection heat transfer of the heating surface in the furnace is increased.
Example 5:
and a certain amount of flue gas is extracted from the flue gas at the outlet of the economizer and then returns to the hearth through the recirculation flue, so that the temperature of the flue gas is reduced, and the generation of thermal NOx is reduced.
Claims (3)
1. An adjustable box boiler heat transfer structure, its constitution includes: recirculation fan, recirculation flue, sealed wind channel, closing baffle, characterized by: the recycling fan is connected with the recycling flue, the closing baffle is installed at the inlet of the recycling fan, the sealed air channel is introduced into the air box at the inlet of the recycling flue, the coal economizer is connected with the hearth through the recycling flue, the inlet of the recycling flue is an outlet flue of the coal economizer, and the sealed air channel is introduced from the cold air channel.
2. The adjustable box boiler heat transfer structure as set forth in claim 1, wherein: and the circulating fan extracts flue gas from the outlet of the economizer and sends the flue gas into the hearth.
3. The adjustable box boiler heat transfer structure as set forth in claim 2, wherein: the recirculation fan adopts a floor arrangement structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021546177.9U CN212961550U (en) | 2020-07-30 | 2020-07-30 | Adjustable box boiler heat transfer structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021546177.9U CN212961550U (en) | 2020-07-30 | 2020-07-30 | Adjustable box boiler heat transfer structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212961550U true CN212961550U (en) | 2021-04-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021546177.9U Active CN212961550U (en) | 2020-07-30 | 2020-07-30 | Adjustable box boiler heat transfer structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212961550U (en) |
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2020
- 2020-07-30 CN CN202021546177.9U patent/CN212961550U/en active Active
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