CN211600762U - Micro-gas ignition system of coal powder furnace of back pressure unit - Google Patents
Micro-gas ignition system of coal powder furnace of back pressure unit Download PDFInfo
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- CN211600762U CN211600762U CN201922252194.5U CN201922252194U CN211600762U CN 211600762 U CN211600762 U CN 211600762U CN 201922252194 U CN201922252194 U CN 201922252194U CN 211600762 U CN211600762 U CN 211600762U
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Abstract
The utility model provides a little gas ignition system of backpressure unit buggy stove which characterized in that: the system comprises a cold furnace powder making system and a furnace gas feeding system, wherein the cold furnace powder making system is communicated with the furnace gas feeding system through a powder feeding pipe, the furnace gas feeding system comprises ignition burners, a hearth, a boiler cold primary air pipeline and a gas main pipe, 4 ignition burners are uniformly distributed around the hearth, and the ignition burners are inserted into the powder feeding pipe; the gas main pipe is respectively communicated with a gas inlet of the ignition burner, and a shut-off valve and a flame arrester are sequentially arranged on the gas main pipe; the boiler cold primary air pipeline is communicated with a combustion-supporting air interface of the ignition burner; the utility model discloses but the pollutant emission during greatly reduced unit commissioning. The utility model discloses technical scheme has characteristics such as investment is little, the running cost is low, the ignition is efficient, clean environmental protection.
Description
Technical Field
The utility model belongs to the technical field of pulverized coal boiler starts the ignition, concretely relates to little gas ignition system of back pressure unit pulverized coal stove.
Background
China is a country with coal as a main energy source, and thermal power generation is one of the main forms of coal utilization in China. The pulverized coal fired boiler has two main ignition modes: one is micro-oil ignition, which is to install an oil gun inside a pulverized coal burner and ignite pulverized coal by using a small amount of fuel oil; the other is that a plasma generator is arranged inside a pulverized coal burner, and the pulverized coal is ignited by a plasma torch. However, both techniques also have very significant drawbacks: although the micro-oil ignition fuel-saving rate reaches 80-90%, a considerable amount of fuel oil still needs to be consumed due to the large base number; although fuel oil is not consumed for plasma ignition, the system load is large, the equipment investment is large, the power consumption is high, the service life of a plasma cathode and anode is short, and the price of accessories is high.
At present, for a power plant with a gas pipe network access, a gas ignition technology can be adopted, and due to the fact that the gas price is lower, the economic benefit of the micro gas ignition technology is better than that of micro oil ignition. The research and development of micro-gas ignition combustion technology of pulverized coal boilers replacing fuel oil ignition and plasma ignition modes is a problem to be solved urgently in the pulverized coal boiler industry.
SUMMERY OF THE UTILITY MODEL
For solving the problem that prior art exists, the utility model provides a little gas ignition system of backpressure unit pulverized coal stove replaces the fuel through utilizing the lower gas of cost to ignite, reduces equipment operation cost when not increasing project construction cost, has extensive economic prospect.
In order to achieve the above object, the utility model provides a little gas ignition system of backpressure unit buggy stove which characterized in that: the system comprises a cold furnace powder making system and a furnace gas feeding system, wherein the cold furnace powder making system is communicated with the furnace gas feeding system through a powder feeding pipe, the furnace gas feeding system comprises ignition burners, a hearth, a boiler cold primary air pipeline and a gas main pipe, 4 ignition burners are uniformly distributed around the hearth, and the ignition burners are inserted into the powder feeding pipe; the gas main pipe is respectively communicated with a gas inlet of the ignition burner, and a shut-off valve and a flame arrester are sequentially arranged on the gas main pipe; and the boiler cold primary air pipeline is communicated with a combustion-supporting air interface of the ignition burner.
Furthermore, a flow meter is arranged on the gas main pipe and used for adjusting the pressure and the flow of the gas.
Furthermore, a nitrogen-filling purging interface is arranged on the gas main pipe and used for filling nitrogen and purging the gas main pipe; the low point of the gas main pipe is provided with a water condensing cylinder for discharging condensed water in the gas pipeline.
Furthermore, the furnace gas system is provided with a main diffusion pipe, and a closing valve is arranged between the main gas pipe and the main diffusion pipe.
Furthermore, the cold furnace coal pulverizing system comprises a steam heater, the steam heater is communicated with a hot primary air channel of the boiler, and an outlet of the steam heater is led to an inlet of a coal mill through a pipeline and is used for heating coal powder when the boiler is started to ignite; the inlet of the steam heater is provided with a spile door which is used as a partition between the steam heater and the hot air duct when the unit operates normally.
Furthermore, the air pressure of the cold primary air pipeline of the boiler is more than 1500Pa, and the maximum air quantity of a single boiler is 6400m3/h。
The utility model discloses the advantage: the utility model discloses utilize the gas to ignite the buggy, do not use the fuel, can not set up the oil district, practice thrift the investment to more conventional oil ignition system practices thrift a large amount of fuel costs. The condition of poor fuel ignition atomization does not exist by adopting fuel gas ignition, the combustion probability of the air preheater can be greatly reduced, and the desulfurization can be put into use at the initial ignition stage of the boiler, so that the pollutant emission during the unit commissioning can be greatly reduced. The utility model discloses technical scheme has characteristics such as investment is little, the running cost is low, the ignition is efficient, clean environmental protection.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a layout view of the ignition burner of the present invention;
FIG. 3 is a schematic view of the powder making system of the cooling furnace of the present invention.
In the figure: 1-a furnace gas system; 2-an ignition burner; 3-hearth; 4-boiler cold primary air pipeline; 5-a gas main pipe; 6-a flow meter; 7-nitrogen charging purge interface; 8-a water condensing cylinder; 9-flame arrestors; 10-shut-off valve; 11-main diffusion pipe; 12-closing the valve; 13-cold furnace pulverizing system; 14-a steam heater; 15-boiler hot primary air duct; 16-coal mill, 17-spile door; 18-powder feeding pipe.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1-3, a micro-gas ignition system of a coal powder furnace of a back pressure unit comprises a cold furnace coal pulverizing system 13 and a furnace entering gas system 1, wherein the cold furnace coal pulverizing system 13 adopts a steam heating mode to provide qualified boiler ignition coal powder, the cold furnace coal pulverizing system 13 comprises a steam heater 14, a steam inlet of the steam heater 14 is communicated with a hot primary air pipeline 15 of the boiler, an outlet of the steam heater 14 is led to an inlet of a coal mill 16 through a pipeline and used for heating the coal powder when the boiler is started to ignite, a plugboard door 17 is arranged at an inlet of the steam heater 14 and used as a partition for the hot primary air pipeline when the unit normally operates, and the cold furnace coal pulverizing system 13 is communicated with the furnace entering gas system 1 through a coal feeding pipe 18; the furnace gas system 1 comprises ignition burners 2, a hearth 3, a boiler cold primary air pipeline 4 and a gas main pipe 5, wherein 4 ignition burners 2 are uniformly distributed around the hearth 3, and the ignition burners 2 are inserted into a powder feeding pipe 18; the boiler cold primary air pipeline 4 is communicated with a combustion-supporting air interface of the ignition burner 2, the air pressure of the boiler cold primary air pipeline 4 is more than 1500Pa, and the maximum air quantity of a single furnace is 6400m3H; the gas main pipe 5 is respectively communicated with the gas inlets of the 4 ignition burners 2, and a flame arrester 9 and a shutoff valve 10 are sequentially arranged on the gas main pipe 5 at the inlet of each ignition burner 2.
A flow meter 6 is arranged on the gas main pipe 5 and used for adjusting the pressure and flow of gas, and a nitrogen-filled purging connector 7 is arranged on the gas main pipe 5 and used for filling nitrogen and purging the gas main pipe 5; the lower point of the gas main pipe 5 is provided with a water condensing cylinder 8 for discharging condensed water in the gas pipeline.
The furnace gas system 1 is provided with a main diffusion pipe 11, and a closing valve 12 is arranged between the gas main pipe 5 and the main diffusion pipe 11.
The working principle of the utility model
1. Ignition is initiated. When the boiler is in the initial stage of ignition, a trace amount of gas is violently combusted with air in an air distributor of the ignition burner to generate flame with high temperature, so that the rigidity of the natural gas flame is improved, and the average temperature of the flame can reach 1500-1700 ℃. And after the gas flame is stable, sending qualified coal powder produced by the cold furnace pulverizing system to an ignition combustor through a powder feeding pipeline, and igniting the coal powder after the coal powder is fully mixed with the high-temperature flame in the combustion chamber. The ignited coal powder is carried into the hearth by the cold primary air of the boiler, and tangential combustion is formed inside the hearth.
2. And stopping ignition exit. And after the ignition of the boiler is finished and the load of the boiler is stabilized above the minimum stable combustion load, the ignition system can exit after the boiler is stably combusted.
Claims (6)
1. The utility model provides a little gas ignition system of backpressure unit buggy stove which characterized in that: the system comprises a cold furnace powder making system and a furnace gas feeding system, wherein the cold furnace powder making system is communicated with the furnace gas feeding system through a powder feeding pipe, the furnace gas feeding system comprises ignition burners, a hearth, a boiler cold primary air pipeline and a gas main pipe, 4 ignition burners are uniformly distributed around the hearth, and the ignition burners are inserted into the powder feeding pipe; the gas main pipe is respectively communicated with a gas inlet of the ignition burner, and a shut-off valve and a flame arrester are sequentially arranged on the gas main pipe; and the boiler cold primary air pipeline is communicated with a combustion-supporting air interface of the ignition burner.
2. The micro-gas ignition system of the back pressure unit pulverized coal furnace as claimed in claim 1, wherein: and the fuel gas main pipe is provided with a flow meter for adjusting the pressure and the flow of the fuel gas.
3. The micro-gas ignition system of the back pressure unit pulverized coal furnace as claimed in claim 1, wherein: the gas main pipe is provided with a nitrogen filling and purging interface for filling nitrogen and purging the gas main pipe; the low point of the gas main pipe is provided with a water condensing cylinder for discharging condensed water in the gas pipeline.
4. The micro-gas ignition system of the back pressure unit pulverized coal furnace as claimed in claim 1, wherein: the furnace gas system is provided with a main diffusion pipe, and a closing valve is arranged between the main gas pipe and the main diffusion pipe.
5. The micro-gas ignition system of the back pressure unit pulverized coal furnace as claimed in claim 1, wherein: the cold furnace coal pulverizing system comprises a steam heater, the steam heater is communicated with a hot primary air duct of the boiler, and an outlet of the steam heater is led to an inlet of a coal mill through a pipeline and used for heating coal powder when the boiler is started to ignite; the inlet of the steam heater is provided with a spile door which is used as a partition between the steam heater and the hot air duct when the unit operates normally.
6. The micro-gas ignition system of the back pressure unit pulverized coal furnace as claimed in claim 1, wherein: the air pressure of the cold primary air pipeline of the boiler is more than 1500Pa, and the maximum air quantity of a single boiler is 6400m3/h。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922252194.5U CN211600762U (en) | 2019-12-12 | 2019-12-12 | Micro-gas ignition system of coal powder furnace of back pressure unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922252194.5U CN211600762U (en) | 2019-12-12 | 2019-12-12 | Micro-gas ignition system of coal powder furnace of back pressure unit |
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| CN211600762U true CN211600762U (en) | 2020-09-29 |
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| CN201922252194.5U Active CN211600762U (en) | 2019-12-12 | 2019-12-12 | Micro-gas ignition system of coal powder furnace of back pressure unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114017796A (en) * | 2021-11-03 | 2022-02-08 | 北京优稳昌盛科技有限公司 | Automatic ignition control system based on pulverized coal fired boiler |
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2019
- 2019-12-12 CN CN201922252194.5U patent/CN211600762U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114017796A (en) * | 2021-11-03 | 2022-02-08 | 北京优稳昌盛科技有限公司 | Automatic ignition control system based on pulverized coal fired boiler |
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