CN112268464A - System and method for igniting and starting power station pulverized coal boiler by blending with coke oven gas - Google Patents
System and method for igniting and starting power station pulverized coal boiler by blending with coke oven gas Download PDFInfo
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- CN112268464A CN112268464A CN202011288126.5A CN202011288126A CN112268464A CN 112268464 A CN112268464 A CN 112268464A CN 202011288126 A CN202011288126 A CN 202011288126A CN 112268464 A CN112268464 A CN 112268464A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/02—Supplying steam, vapour, gases, or liquids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
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Abstract
A system and a method for igniting and starting a power station pulverized coal boiler mixed with coke oven gas comprise an A layer or B layer coke oven gas ignition rod, a small air gun, a BC layer coke oven gas atmosphere gun, a DD layer coke oven gas ignition rod, an ignition air gun and an atmosphere gun which are arranged at the four corners of a boiler hearth from bottom to top in sequence. When the boiler is started in a cold state, firstly, a small micro-gas gun of coke oven gas in a primary air burner of an A layer or a B layer is ignited by using an ignition rod for arcing, then, a large coke oven gas gun in a secondary air burner of a BC layer on the upper part of the primary air burner is directly ignited by using the burnt small micro-gas gun, then, the ignition gas gun in the secondary air burner of the DD layer is ignited by using a high-energy ignition rod for arcing, then, the large coke oven gas gun in the secondary air burner of the DD layer is ignited by using the burnt ignition gas gun, the temperature rise process in the boiler is realized after the small micro-gas gun of one layer and the large gas gun of two layers are ignited, and the ignition and the firing process of the boiler is realized after the temperature rises to a set value.
Description
Technical Field
The invention belongs to the field of ignition combustion of a pulverized coal boiler with four tangential corners, and particularly relates to a system and a method for igniting and starting a pulverized coal boiler of a power station by blending coke oven gas.
Background
The ignition start-up of the traditional power station pulverized coal boiler mainly adopts the following two modes: firstly, a large oil gun or a small oil gun is adopted for ignition, the oil gun is ignited to atomize and spray diesel oil in the ignition stage of the boiler, the heating process is realized by the combustion of the diesel oil in the hearth of the boiler, the pulverized coal boiler of an early power station almost completely adopts the mode, but the biggest problem of the pulverized coal boiler of the early power station is that the fuel oil consumption is huge in the starting process at each time, the fuel oil can be consumed by more than 150t in the cold starting process of a 600MW unit at most, the fuel cost is huge, and secondly, if the diesel oil is incompletely combusted, the environmental protection problems such as black smoke emission and the like easily occur; secondly, plasma ignition is adopted, high voltage or current is utilized, direct current air plasma with stable power is obtained through contact arc ignition under a strong magnetic field, the plasma forms a local high-temperature area with extremely large gradient in a primary air burner, and accordingly pulverized coal is ignited.
The coke oven gas is used as a byproduct in the coking process of a coking plant, and the main component of the coke oven gas is H2(about 55%) and CH4(about 25 percent), the heat value is about 17-19 MJ/kg, the coal powder boiler has the advantages of low ignition temperature, easy ignition, quick ignition and good combustion effect, is a good fuel for a power station coal powder boiler with a coke oven gas source, and part of domestic units begin to use coke oven gas to replace part of coal powder and mix and burn in the normal operation process to realize certain economic benefit, but the coke oven gas is not used as a heat source for igniting and starting the power station coal powder boiler.
Disclosure of Invention
The invention aims to provide a system and a method for igniting and lifting a pulverized coal boiler of a power station by utilizing coke oven gas, aiming at the defects of the prior art.
The invention is realized by adopting the following technical scheme:
a system for igniting and starting a pulverized coal boiler in a power station by using coke oven gas comprises an A layer or B layer coke oven gas ignition rod, a small gas gun, a BC layer coke oven gas big gas gun, a DD layer coke oven gas ignition rod, an ignition gas gun and a big gas gun which are arranged at the four corners of a boiler hearth from bottom to top in sequence.
The invention further improves the structure and the method, and further comprises AA layer secondary air nozzles, A layer primary air nozzles, AB layer secondary air nozzles, B layer primary air nozzles, BC layer secondary air nozzles, C layer primary air nozzles, CC layer secondary air nozzles, DD layer secondary air nozzles, D layer primary air nozzles, DE layer secondary air nozzles, E layer primary air nozzles, EE layer secondary air nozzles and over-fire air nozzles which are arranged at four corners of a boiler hearth from bottom to top.
The invention has the further improvement that the coke oven gas ignition rod and the small gas gun on the layer A or the layer B are arranged in the primary air nozzle on the layer A or the layer B, the small gas gun is arranged at the central position of the primary air nozzle, and the ignition rod is arranged on one side of the small gas gun.
The further improvement of the invention is that the BC layer coke oven gas atmosphere gun is arranged at the center of the BC layer secondary air nozzle.
The further improvement of the invention is that the DD layer coke oven gas atmosphere gun is arranged at the central position of the DD layer secondary air nozzle, and the ignition rod and the ignition air gun are arranged at the same side of the atmosphere gun.
The invention is further improved in that flame detectors are arranged near the small gas guns of the coke oven gas of the layer A or the layer B, the large gas guns of the coke oven gas of the layer BC and the atmosphere of the coke oven gas of the layer DD.
The invention is further improved in that the gas quantity of the small gas guns of the coke oven gas of the layer A or the layer B is 300-500 Nm3/h。
The further improvement of the invention is that the gas amount of the BC layer coke oven gas large air gun is 3000-4000 Nm3/h。
The further improvement of the invention is that the atmospheric gas quantity of the DD layer coke oven gas is 3000-4000 Nm3/h。
A method for igniting and starting a pulverized coal boiler in a power station by using coke oven gas comprises the steps of firstly igniting the small coke oven gas micro-gas guns in primary air burners of an A layer or a B layer by using ignition rods for arc starting, then directly igniting the large coke oven gas guns in secondary air burners of a BC layer on the upper part of the small coke oven gas guns by using the burnt micro-gas guns, then igniting the ignition gas guns in the secondary air burners of the DD layer by using high-energy ignition rods in the secondary air burners of the DD layer, then igniting the large coke oven gas guns in the secondary air burners of the DD layer by using the burnt micro-gas guns, realizing the temperature rise process in the boiler after the small micro-gas guns and the large gas guns of the DD layer are all ignited, and then feeding pulverized coal into the boiler after the temperature rises to a set value to realize the ignition and starting process of the boiler when the boiler is in a cold.
The invention has at least the following beneficial technical effects:
the invention provides a system for igniting and starting a power station pulverized coal boiler by utilizing coke oven gas, which mainly comprises a micro-gas small air gun in a primary air burner layer, an ignition air gun in a secondary air burner layer and a large air gun in two secondary air burners layer, the ignition start-up method is mainly characterized in that when a boiler is started in a cold state, a micro-gas small air gun in a primary air burner is ignited by a high-energy ignition rod in an ignition arc mode, and after the micro-gas small air gun is ignited, a large air gun in a secondary air burner at the upper part of the micro-gas small air gun is directly ignited, and then, igniting an ignition air gun in the other layer of secondary air burner by using a high-energy ignition rod, directly igniting a large air gun in the layer of secondary air burner after the ignition air gun is ignited, realizing the temperature rise process in the boiler after one layer of micro-air small air gun and two layers of large air guns are ignited, and feeding coal powder after the temperature rises to a set value to realize the ignition and furnace-starting process of the boiler.
The method for igniting and starting the pulverized coal boiler of the power station by using the coke oven gas not only realizes the zero-oil ignition and starting process, but also has the advantages that the whole system is simple and reliable, the combustion after the normal operation of the boiler is not influenced, the combustion and the utilization of the coke oven gas not only can reduce the coal consumption and the production cost, but also can obviously reduce the generation concentration of NOx, and the method has obvious economic and environmental benefits.
Drawings
FIG. 1 is a system structure diagram of a pulverized coal boiler of a power station for ignition and furnace lifting by using coke oven gas.
Fig. 2 is a schematic structural diagram of a DD layer secondary air nozzle, fig. 2(a) is a side view, and fig. 2(b) is a front view.
Fig. 3 is a schematic structural view of the BC-layer overfire air nozzle, fig. 3(a) is a side view, and fig. 3(b) is a front view.
Fig. 4 is a schematic structural diagram of a layer a or a layer B primary air nozzle, fig. 4(a) is a side view, and fig. 4(B) is a front view.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention provides a system for igniting and lifting a pulverized coal boiler in a power station by using coke oven gas, which is shown in a schematic diagram of fig. 1, and detailed primary air nozzles on an A layer or a B layer, secondary air nozzles on a BC layer and a DD layer are shown in fig. 2-4.
The technical key points of the coke oven gas ignition furnace-lifting system are that a small coke oven gas gun is added in a primary air nozzle on the layer A or the layer B, a large coke oven gas gun is added in a secondary air nozzle on the adjacent layer BC of a primary air burner on the layer B, and a coke oven gas ignition rod, an ignition air gun and a large air gun are added in a secondary air nozzle on the layer DD.
In addition, the invention also comprises AA layer secondary air nozzles, A layer primary air nozzles, AB layer secondary air nozzles, B layer primary air nozzles, BC layer secondary air nozzles, C layer primary air nozzles, CC layer secondary air nozzles, DD layer secondary air nozzles, D layer primary air nozzles, DE layer secondary air nozzles, E layer primary air nozzles, EE layer secondary air nozzles and over fire air nozzles (OFA air) which are arranged at four corners of the boiler furnace from bottom to top.
Specifically, the coke oven gas ignition rod and the small air gun on the layer A or the layer B are arranged in the primary air nozzle on the layer A or the layer B, the small air gun is arranged at the central position of the primary air nozzle, and the ignition rod is arranged on one side of the small air gun. The BC layer coke oven gas atmosphere gun is arranged at the center of the BC layer secondary air nozzle. The DD layer coke oven gas atmosphere gun is arranged at the central position of the DD layer secondary air nozzle, and the ignition rod and the ignition air gun are arranged at the same side of the atmosphere gun.
In addition, flame detectors are arranged near the small gas guns of the coke oven gas of the layer A or the layer B, the large gas guns of the coke oven gas of the layer BC and the atmosphere of the coke oven gas of the layer DD. The gas amount of the small gas guns of the coke oven gas of the layer A or the layer B is 300-500 Nm3H is used as the reference value. The gas amount of the BC layer coke oven gas atmosphere gun is 3000-4000 Nm3H is used as the reference value. The atmospheric gas quantity of the DD layer coke oven gas is 3000-4000 Nm3/h。
The invention provides a method for igniting and starting a power station pulverized coal boiler by utilizing coke oven gas, which comprises the steps of firstly utilizing a high-energy ignition rod to start arc to ignite a small coke oven gas micro-gas gun in a primary air burner of an A layer or a B layer, then utilizing the burnt small micro-gas gun to directly ignite a large coke oven gas gun in a secondary air burner of an upper BC layer, then utilizing a high-energy ignition rod in a secondary air burner of a DD layer to start arc to ignite an ignition gas gun in the secondary air burner of the DD layer, then utilizing the burnt small gas gun to ignite the large coke oven gas gun in the secondary air burner of the DD layer, realizing the temperature rise process in the boiler after the small micro-gas gun of one layer and the large gas gun of two layers are all ignited, and then throwing pulverized coal into the boiler after the temperature rises to a set value, thereby realizing the ignition and starting process of the boiler.
The invention provides a system and a method for igniting and starting a pulverized coal boiler of a power station by using coke oven gas, which have the following advantages:
(1) the coke oven gas has the characteristic of easy ignition, is a perfect ignition and furnace-starting alternative fuel, can completely realize zero oil-feeding ignition of the pulverized coal boiler of the power station by utilizing the ignition and furnace-starting of the coke oven gas, and obviously reduces the furnace-starting cost of the boiler.
(2) The coke oven gas has good burnout performance, and cannot cause environmental problems due to incomplete combustion.
(3) The whole system is simple and reliable, has little influence on the original boiler system, does not have negative influence on the safe, stable and environment-friendly operation of the later boiler, can replace pulverized coal and reduce NOx generation, and has remarkable social and environmental benefits.
The protection scope of the invention is as follows:
(1) the key technical points of a system for igniting and starting a coal powder boiler by using coke oven gas in a power station are that a small coke oven gas gun is added in a primary air nozzle on an A layer or a B layer, a large coke oven gas gun is added in a secondary air nozzle on an adjacent BC layer of a primary air burner on the A layer or the B layer, and a coke oven gas ignition air gun and a large air gun are added in a secondary air nozzle on a DD layer.
(2) A method for igniting and starting a pulverized coal boiler in a power station by using coke oven gas comprises the steps of firstly starting arc ignition by using a high-energy ignition rod to ignite a small coke oven gas gun in a primary air burner of an A layer or a B layer, then directly igniting a large coke oven gas gun in a secondary air burner of a BC layer on the upper part of the primary air burner by using the combusted small gas gun, then starting arc ignition by using a high-energy ignition rod in a secondary air burner of a DD layer to ignite an ignition gas gun in a secondary air burner of the DD layer, then igniting the large coke oven gas gun in the secondary air burner of the DD layer by using the combusted ignition gas gun, realizing a temperature rise process in the boiler after the small gas gun of one layer and the large gas gun of the two layers are all ignited, and then feeding pulverized coal into the boiler after the temperature rises to a set value to realize the ignition and starting process of the.
Claims (10)
1. A system for igniting and starting a power station pulverized coal boiler by using coke oven gas is characterized by comprising an A layer or B layer coke oven gas ignition rod, a small air gun, a BC layer coke oven gas atmosphere gun, a DD layer coke oven gas ignition rod, an ignition air gun and an atmosphere gun which are sequentially arranged at the four corners of a boiler hearth from bottom to top.
2. The system of claim 1, further comprising an AA layer secondary air nozzle, an a layer primary air nozzle, an AB layer secondary air nozzle, a B layer primary air nozzle, a BC layer secondary air nozzle, a C layer primary air nozzle, a CC layer secondary air nozzle, a DD layer secondary air nozzle, a D layer primary air nozzle, a DE layer secondary air nozzle, an E layer primary air nozzle, an EE layer secondary air nozzle, and an over-fire air nozzle, which are disposed at four corners of the boiler furnace from bottom to top.
3. The system for igniting and lifting the coke oven gas for the pulverized coal fired boiler of the power station according to claim 2, wherein the coke oven gas ignition bar and the small air gun on the layer A or the layer B are arranged in the primary air nozzle on the layer A or the layer B, the small air gun is arranged at the center of the primary air nozzle, and the ignition bar is arranged on one side of the small air gun.
4. The system for the pulverized coal fired boiler of the power plant to ignite and start the boiler by using the coke oven gas as claimed in claim 2, wherein the BC layer coke oven gas atmosphere gun is arranged at the center of the BC layer secondary air nozzle.
5. The system for igniting and lifting the coke oven gas for the pulverized coal fired boiler of the power plant according to claim 2, wherein the atmospheric gun for the coke oven gas of the DD layer is arranged at the center of the secondary air nozzle of the DD layer, and the ignition rod and the ignition air gun are arranged on the same side of the atmospheric gun.
6. The system for igniting and discharging the coke oven gas for the pulverized coal fired boiler of the power station as claimed in claim 1, wherein the flame detectors are arranged near the small gas guns of the coke oven gas of the layer A or the layer B, the large gas guns of the coke oven gas of the layer BC and the atmosphere of the coke oven gas of the layer DD.
7. The system for ignition and furnace-lifting of coke oven gas for pulverized coal fired boilers of power stations as claimed in claim 1, wherein the amount of small gas guns for coke oven gas in layer A or layer B is 300-500 Nm3/h。
8. The system for ignition and furnace-lifting of coke oven gas for pulverized coal fired boilers of power plants of claim 1, wherein the amount of the large gas gun of the coke oven gas in the BC layer is 3000-4000 Nm3/h。
9. The system for ignition and furnace-lifting of coke oven gas for pulverized coal fired boilers of power stations as claimed in claim 1, wherein the amount of atmospheric gas of the coke oven gas in the DD layer is 3000-4000 Nm3/h。
10. A method for igniting and starting a pulverized coal boiler in a power station by using coke oven gas is characterized in that when the boiler is started in a cold state, firstly, a firing rod is used for starting arc to ignite a coke oven gas micro-gas firing gun in a primary air burner of an A layer or a B layer, then the burnt micro-gas gun is used for directly igniting a coke oven gas large air gun in a secondary air burner of an upper BC layer, then a high-energy firing rod in a secondary air burner of a DD layer is used for starting arc to ignite an ignition air gun in the secondary air burner of the DD layer, then the burnt ignition air gun is used for igniting the coke oven gas large air gun in the secondary air burner of the DD layer, the temperature rise process in the boiler is realized after the micro-gas gun of one layer and the large air gun of two layers are both ignited, and pulverized coal is put into the boiler after the temperature rises to a set value, so that.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011288126.5A CN112268464A (en) | 2020-11-17 | 2020-11-17 | System and method for igniting and starting power station pulverized coal boiler by blending with coke oven gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011288126.5A CN112268464A (en) | 2020-11-17 | 2020-11-17 | System and method for igniting and starting power station pulverized coal boiler by blending with coke oven gas |
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| CN112268464A true CN112268464A (en) | 2021-01-26 |
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| CN202011288126.5A Pending CN112268464A (en) | 2020-11-17 | 2020-11-17 | System and method for igniting and starting power station pulverized coal boiler by blending with coke oven gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188118A (en) * | 2021-04-09 | 2021-07-30 | 东方电气集团东方锅炉股份有限公司 | Equipment and method for bulk blending combustion of industrial tail gas in circulating fluidized bed boiler |
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2020
- 2020-11-17 CN CN202011288126.5A patent/CN112268464A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188118A (en) * | 2021-04-09 | 2021-07-30 | 东方电气集团东方锅炉股份有限公司 | Equipment and method for bulk blending combustion of industrial tail gas in circulating fluidized bed boiler |
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