CN214223782U - System for firing and starting coal-fired boiler of power station by blending coke oven gas - Google Patents
System for firing and starting coal-fired boiler of power station by blending coke oven gas Download PDFInfo
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- CN214223782U CN214223782U CN202022667273.5U CN202022667273U CN214223782U CN 214223782 U CN214223782 U CN 214223782U CN 202022667273 U CN202022667273 U CN 202022667273U CN 214223782 U CN214223782 U CN 214223782U
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Abstract
A system for igniting and starting a power station pulverized coal boiler mixed with coke oven gas comprises 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 coke oven gas gun in a primary air burner of the layer A or the layer B is ignited by using an ignition rod for arcing, then, a large coke oven gas gun in a secondary air burner of the layer BC at the upper part of the primary air burner is directly ignited by using the burnt small coke gas gun, then, an ignition air gun in a secondary air burner of the layer DD 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 layer is ignited by using the burnt ignition air gun, the temperature rise process in the boiler is realized after the small coke oven gas gun of one layer and the large air guns of the 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 utility model belongs to four corners tangential pulverized coal boiler ignition field, concretely relates to mix system of power station pulverized coal boiler ignition of burning 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, and the environment is influenced; 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 utility model aims to overcome the defects of the prior art and provide a system for igniting and blowing out a power station pulverized coal boiler mixed with coke oven gas.
The utility model discloses a following technical scheme realizes:
a system for igniting and starting a power station pulverized coal boiler mixed with coke oven gas comprises an A layer or B layer coke oven gas ignition rod, a small air gun, a BC layer coke oven gas big air gun, a DD layer coke oven gas ignition rod, an ignition air gun and a big air gun which are arranged at the four corners of a boiler hearth from bottom to top in sequence.
The utility model discloses a further improvement lies in, still include the AA layer overgrate air spout of once setting up on boiler furnace four corners from bottom to top, A layer overgrate air spout, AB layer overgrate air spout, B layer overgrate air spout, BC layer overgrate air spout, C layer overgrate air spout, CC layer overgrate air spout, DD layer overgrate air spout, D layer overgrate air spout, DE layer overgrate air spout, E layer overgrate air spout, EE layer overgrate air spout to and burn out the wind spout.
The utility model discloses further improvement lies in, A layer or B layer coke oven gas point stick, little air gun arrange in A layer or B layer wind spout, and little air gun arranges in a wind spout central point puts, and the ignition stick is arranged in little air gun one side.
The utility model discloses further improvement lies in, BC layer coke oven gas big air gun arranges that BC layer overgrate air spout central point puts.
The utility model discloses further improvement lies in, DD layer coke oven gas big air gun arranges in DD layer overgrate air spout central point and puts, and the burning torch is arranged with one side at the atmosphere rifle with the ignition air gun.
The utility model has the further improvement that the flame detector is arranged near the A layer or B layer coke oven gas small air gun, BC layer coke oven gas big air gun and DD layer coke oven gas atmosphere.
The utility model has the further improvement that the gas amount of the small gas guns of the coke oven gas on the A layer or the B layer is 300 to 500Nm3/h。
The utility model discloses further improvement lies in, BC layer coke oven gas big air gun tolerance is 3000 ~ 4000Nm3/h。
The utility model discloses further improvement lies in, DD layer coke oven gas atmospheric gas volume is 3000 ~ 4000Nm3/h。
The utility model discloses at least, following profitable technological effect has:
the utility model provides a system for igniting and blowing out a power station pulverized coal boiler mixed with coke oven gas, the system mainly comprises a micro-gas small air gun in a first layer of primary air burner, an ignition air gun in a second layer of secondary air burner and a large air gun in a second layer of secondary air burner, 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 igniting a small air gun, realizing the temperature rise process in the boiler after igniting the small air gun in one layer and the large air guns in two layers, and feeding coal powder after the temperature rises to a set value to realize the ignition and furnace-starting process of the boiler.
The utility model discloses not only realized the zero oil ignition process of starting a stove, entire system is simple reliable moreover, can not exert an influence to the burning after the boiler normal operating, and the burning utilization of coke oven gas not only can reduce coal consumption, reduction in production cost, can show moreover and reduce NOx and generate concentration, has apparent economy and environmental protection benefit.
Drawings
FIG. 1 is a system structure diagram of the utility model for igniting and starting the pulverized coal fired boiler of a power station which co-burns 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.
Description of reference numerals:
1-boiler furnace, 2-AA layer secondary air nozzle, 3-A layer primary air nozzle, 4-AB layer secondary air nozzle, 5-B layer primary air nozzle, 6-BC layer secondary air nozzle, 7-C layer primary air nozzle, 8-CC layer secondary air nozzle, 9-DD layer secondary air nozzle, 10-D layer primary air nozzle, 11-DE layer secondary air nozzle, 12-E layer primary air nozzle, 13-EE layer secondary air nozzle, 14-over air nozzle, 15-flame detector, 16-ignition rod, 17-ignition air gun, 18-big air gun and 19-small air gun.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
The utility model provides a pair of mix system of firing power station pulverized coal boiler ignition of coke oven gas, its schematic diagram is shown as figure 1, and detailed A layer or B layer wind spout, BC layer and DD layer overgrate air spout are shown as figure 2 ~ 4.
The technical key of the coke oven gas ignition furnace-starting system of the utility model is that a small coke oven gas gun is added in the primary air nozzle of the A layer or the B layer, a large coke oven gas gun is added in the secondary air nozzle of the adjacent BC layer of the primary air burner of the B layer, a coke oven gas ignition rod 16, an ignition air gun 17 and a large air gun 18 are added in the secondary air nozzle of the DD layer.
Furthermore, the utility model discloses still include the AA layer overgrate air spout 2 of once setting up on 1 four corners of boiler furnace from bottom to top, the wind spout 3 is once done to the A layer, AB layer overgrate air spout 4, the wind spout 5 is once done to the B layer, BC layer overgrate air spout 6, the wind spout 7 is once done to the C layer, CC layer overgrate air spout 8, DD layer overgrate air spout 9, D layer overgrate air spout 10, DE layer overgrate air spout 11, E layer overgrate air spout 12, EE layer overgrate air spout 13 to and burn out wind spout 14(OFA wind).
Specifically, the coke oven gas ignition rod and the small air gun 19 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 19 is arranged at the central position of the primary air nozzle, and the ignition rod 16 is arranged on one side of the small air gun 19. 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 center of the DD layer secondary air nozzle, and the ignition rod 16 and the ignition air gun 17 are arranged at the same side of the atmosphere gun 18.
In addition, flame detectors 15 are disposed near the small gas guns of the coke oven gas of the A layer or the B layer, the large gas guns of the coke oven gas of the BC layer and the atmosphere of the coke oven gas of the DD layer. 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 utility model provides a method that power plant pulverized coal boiler utilized coke oven gas to light a fire the start-up does, when the boiler cold state starts, at first utilize the high energy ignition bar to strike the arc and light the little air gun of coke oven gas in A layer or the B layer primary air combustor, then utilize the little air gun of burnt gas directly to ignite the big air gun of coke oven gas in its upper portion BC layer overgrate air combustor, later utilize the high energy ignition bar in the DD layer overgrate air combustor to strike the ignition air gun 17 in the DD layer overgrate air combustor, then utilize the ignition air gun 17 that has burnt to strike the big air gun of coke oven gas in this layer overgrate air combustor, the little air gun of one deck gas, the interior intensification process of realization stove after two-layer big air gun all is lighted, throw in the buggy behind the temperature rise to the setting value, realize the boiler ignition start-up process.
The utility model provides a mix system of power station pulverized coal boiler ignition of burning coke oven gas has following advantage:
(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 utility model discloses the scope of protection as follows:
(1) the key technical points of the system for igniting and starting the power station pulverized coal boiler by blending the coke oven gas 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 the primary air burner on the layer B, and a coke oven gas ignition rod 16, an ignition air gun 17 and an atmosphere gun 18 are added in a secondary air nozzle on the layer DD.
(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 igniting the small coke oven gas micro-gas guns in primary air burners of an A layer or a B layer by using a high-energy ignition rod for arc starting when the boiler is started in a cold state, then directly igniting the large coke oven gas guns in secondary air burners of an upper BC layer by using the burnt small micro-gas guns, then igniting the ignition gas guns 17 in the secondary air burners of the DD layer by using the high-energy ignition rod for arc starting 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 ignition gas guns 17, realizing the temperature rise process in the boiler after the small micro-gas guns and the large air guns of the two layers are all ignited, and then feeding pulverized coal into the boiler after the temperature rises to a set value, thereby realizing the ignition and starting of the boiler.
Claims (9)
1. A system for igniting and starting a power station pulverized coal boiler mixed with 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 arranged at the four corners of a boiler hearth from bottom to top in sequence.
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 starting the power station pulverized coal boiler for co-firing coke oven gas as recited in claim 2, wherein the coke oven gas ignition bar and the small air gun of the layer A or the layer B are arranged in the primary air nozzle of 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 at one side of the small air gun.
4. The system for igniting and starting the pulverized coal fired boiler of the power station for co-firing coke oven gas as recited in claim 2, wherein the BC layer coke oven gas air gun is arranged at the center of the BC layer secondary air nozzle.
5. The system for igniting and starting the pulverized coal fired boiler of the power station for co-firing coke oven gas as claimed in 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 at the same side of the atmospheric gun.
6. The system for igniting and starting the coal powder boiler of the power station for co-firing the coke oven gas as recited 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 large gas guns of the coke oven gas of the layer DD.
7. The system for igniting and blowing up the power station pulverized coal boiler for co-firing coke oven gas as recited in claim 1, wherein the amount of small gas guns for coke oven gas in the layer A or layer B is 300-500 Nm3/h。
8. The system for igniting and blowing up the power station pulverized coal boiler mixed with the coke oven gas as claimed in claim 1, wherein the amount of the large air gun gas of the coke oven gas in the BC layer is 3000-4000 Nm3/h。
9. The system for igniting and blowing up the power station pulverized coal boiler mixed with the coke oven gas as claimed in claim 1, wherein the atmospheric gas amount of the coke oven gas in the DD layer is 3000-4000 Nm3/h。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022667273.5U CN214223782U (en) | 2020-11-17 | 2020-11-17 | System for firing and starting coal-fired boiler of power station by blending coke oven gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022667273.5U CN214223782U (en) | 2020-11-17 | 2020-11-17 | System for firing and starting coal-fired boiler of power station by blending coke oven gas |
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| CN214223782U true CN214223782U (en) | 2021-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022667273.5U Active CN214223782U (en) | 2020-11-17 | 2020-11-17 | System for firing and starting coal-fired boiler of power station by blending coke oven gas |
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