CN106838861B - A kind of burning of coal technique and its combustion furnace - Google Patents
A kind of burning of coal technique and its combustion furnace Download PDFInfo
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- CN106838861B CN106838861B CN201510871929.6A CN201510871929A CN106838861B CN 106838861 B CN106838861 B CN 106838861B CN 201510871929 A CN201510871929 A CN 201510871929A CN 106838861 B CN106838861 B CN 106838861B
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Abstract
A kind of burning of coal technique and its combustion furnace, equipment of the invention are to be reacted using pure oxygen with bunker coal, using the ignition temperature in burner hearth tiny structure control burner hearth, avoid energy loss caused by flue gas recirculation and more serious to the abrasion of furnace wall because recycling；The advantages that compared to current circulating fluidized bed boiler, IGCC and oxygen-enriched burning process, equipment investment is small, and occupied area is small, and structure is simple, and ignition temperature is high, environment and smaller carbon emission.
Description
Technical field
The present invention relates to a kind of burning of coal technique and its combustion furnaces.
Background technique
Present boiler mainly uses circulating fluidized bed boiler, and cycle efficieny is low；IGCC, which needs first to gasify, generates fuel gas
Enter internal combustion engine after purification, the device is complicated, and investment is high.Because oxygen ability manufacturing cost is higher, oxygen-enriched combusting, oxygen-enriched combustion are used at present
It burns with than usual air, (the high oxygen-enriched air of oxygen-containing 21%) oxygen concentration burns, for control furnace flame temperature and dimension
Suitable heat-transfer character is held, partial fume is needed to be recycled, not only increase circulator in this way and is generated while burning
NOX。
The innovation of oxygenerating technology at present, the drop bottom of oxygen cost processed.Equipment of the invention is to be carried out using pure oxygen with bunker coal
Reaction avoids energy loss caused by flue gas recirculation and because of circulation pair using the ignition temperature in burner hearth tiny structure control burner hearth
The abrasion of furnace wall is more serious；Compared to current circulating fluidized bed boiler, IGCC and oxygen-enriched burning process, equipment investment is small, land occupation
The advantages that area is small, and structure is simple, ignition temperature is high, environment and smaller carbon emission.
Summary of the invention
The present invention is exactly to be carried out to solve to provide a kind of burning of coal technique and its combustion furnace using pure oxygen with bunker coal
Reaction avoids energy loss caused by flue gas recirculation and because of circulation pair using the ignition temperature in burner hearth tiny structure control burner hearth
The more serious technical problem of the abrasion of furnace wall.
In order to solve the above technical problems, the technical solution of a kind of burning of coal technique of the present invention and its combustion furnace are as follows:
Burning of coal technique of the present invention, comprising the following steps:
Coal is layered in lime-ash carbon residue combustion chamber by the first step；Boiler feedwater enters boiler feedwater preheating heat exchanger, water-cooling wall
Heat exchange pipeline, make pipeline keep water-filling state, steam evacuation valve emptying；Returning charge valve is closed；
Step 2: leading to plant air from oxygen jet, opens air-introduced machine and guarantee micro-positive pressure in burner hearth.
Step 3: furnace middle portion temperature is promoted to 750 DEG C with coal gas is gone into operation, furnace bottom temperature is promoted to 650 ~ 850 DEG C；
From raw coal conduit into coal, the coal gas that goes into operation is closed after coals most in furnace are ignite, combustion furnace is controlled by plus-minus coal
Temperature after guaranteeing accumulation of heat in furnace and cultivating the bed of material, sprays into steam, the indoor gas of replacement combustion through oxygen jet at 800 ~ 900 DEG C
Body is down to 800 or so to furnace bottom temperature, slowly send pure oxygen, guarantees indoor oxygen content of burning；Furnace coal weight is adjusted by furnace
Bore temperature maintains 900 ~ 950 DEG C and while regulating and guiding blower, guarantee burner hearth tiny structure, by air-introduced machine with adjusting flue gas flow rate
Effect keep the steam heat-exchanging efficiency for collecting buffer different, guarantee the temperature of steam (vapor) outlet；Water in pipeline is through boiler feedwater
It is sent after preheating heat exchanger and the preheating of lime-ash carbon residue combustion chamber to boiler feedwater distributor and is sent to flying dust collection and heat recovery room
With combustion chamber water-cooling wall, enter superheat section and steam through combustion chamber, the steam that flying dust is collected and heat recovery room water-cooling wall generates
After collecting buffer reheating, high temperature and high pressure steam is generated for users to use；
Step 4: tail gas is entered in drying machine by the extraction of air-introduced machine and is carried out to coal to drying machine continuously into coal
It is dry, and the tail gas after drying is dusted, washing, desulfurization；
Step 5: coal of the drying machine after dry is sent to raw material cabin, the feed coal that combustion furnace is added is controlled by raw material cabin
Amount；
Step 6: ash material collector has certain flying dust to gather materials, returning charge amount is adjusted, guarantees that returning charge amount and flying dust yield are flat
Weighing apparatus；
Step 7: opening ash-slag disposal system after there is certain piling height in lime-ash carbon residue combustion chamber, slowly it is discharged centainly
Lime-ash guarantees lime-ash balance.
The third step guarantees that the indoor oxygen content of burning is between 85% to 100%.
The third step guarantees that the indoor oxygen content of burning is 95%.
For a kind of a kind of combustion furnace of burning process, including lagging casing and coal feeding pipe road, in the lagging casing
If there are three warehouse, respectively positioned at bottom lime-ash carbon residue combustion chamber, be located on lime-ash carbon residue combustion chamber and with lime-ash carbon residue
The combustion chamber and flying dust is collected and heat recovery room that combustion chamber communicates；Lime-ash carbon residue combustion chamber and flying dust collection and heat
It is communicated between recovery room by ash material collector；The boiler feedwater for being provided with water inlet is installed on the outside of lime-ash carbon residue combustion chamber
Preheating heat exchanger；The lime-ash carbon residue bottom of combustion chamber is equipped with ignition system and oxygen feeding tube road；Side wall outside the combustion chamber
There is one layer of water-cooling wall；The water-cooling wall, which is provided with intercommunicating pore, communicates combustion chamber with flying dust collection and heat recovery room；Under water-cooling wall
Side is connected with boiler feedwater distributor；The boiler feedwater distributor is connect with boiler feedwater preheating heat exchanger；One vapor collection
Buffer is mounted on combustion chamber upper end and connect with water-cooling wall；The coal feeding pipe road is communicated with combustion chamber, and coal feed point, which is located at, to be protected
Warm outer side of shell；The flying dust is collected and heat recovery room is equipped with the combustion tail gas pipeline communicated with itself；The combustion tail gas
The pipeline other end is located on the outside of lagging casing and connect with air-introduced machine.
What the present invention can achieve has the technical effect that the present invention is to react using pure oxygen with bunker coal, using burner hearth
Tiny structure controls the ignition temperature in burner hearth, avoids energy loss caused by flue gas recirculation and because recycling the abrasion to furnace wall more
Seriously；Compared to circulating fluidized bed boiler and IGCC, equipment investment is small, and occupied area is small, and structure is simple, ignition temperature is high, environment
The advantages that smaller with carbon emission.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:
Fig. 1 is a kind of structural schematic diagram of combustion furnace of the present invention；
Fig. 2 is the top view that Fig. 1 is not drawn into exhaust pipe and coal feeding pipe road；
Fig. 3 is the A-A sectional view of Fig. 1；
Fig. 4 is a kind of process flow chart of burning of coal technique of the present invention.
Specific embodiment
Further details of elaboration is made to the present invention with reference to the accompanying drawing.
Refering to fig. 1 to Fig. 4.
A kind of burning of coal technique of embodiment one, comprising the following steps:
Coal is layered in lime-ash carbon residue combustion chamber by the first step；Boiler feedwater enters boiler feedwater preheating heat exchanger, water-cooling wall
Heat exchange pipeline, make pipeline keep water-filling state, steam evacuation valve emptying；Returning charge valve is closed；
Step 2: leading to plant air from oxygen jet, opens air-introduced machine and guarantee micro-positive pressure in burner hearth.
Step 3: furnace middle portion temperature is promoted to 750 DEG C with coal gas is gone into operation, furnace bottom temperature is promoted to 650 ~ 850 DEG C；
From raw coal conduit into coal, the coal gas that goes into operation is closed after coals most in furnace are ignite, combustion furnace is controlled by plus-minus coal
Temperature after guaranteeing accumulation of heat in furnace and cultivating the bed of material, sprays into steam, the indoor gas of replacement combustion through oxygen jet at 800 ~ 900 DEG C
Body is down to 800 or so to furnace bottom temperature, slowly send pure oxygen, guarantees indoor oxygen content of burning；Furnace coal weight is adjusted by furnace
Bore temperature maintains 900 ~ 950 DEG C and while regulating and guiding blower, guarantee burner hearth tiny structure, by air-introduced machine with adjusting flue gas flow rate
Effect keep the steam heat-exchanging efficiency for collecting buffer different, guarantee the temperature of steam (vapor) outlet；Water in pipeline is through boiler feedwater
It is sent after preheating heat exchanger and the preheating of lime-ash carbon residue combustion chamber to boiler feedwater distributor and is sent to flying dust collection and heat recovery room
With combustion chamber water-cooling wall, enter superheat section and steam through combustion chamber, the steam that flying dust is collected and heat recovery room water-cooling wall generates
After collecting buffer reheating, high temperature and high pressure steam is generated for users to use；
Step 4: tail gas is entered in drying machine by the extraction of air-introduced machine and is carried out to coal to drying machine continuously into coal
It is dry, and the tail gas after drying is dusted, washing, desulfurization；
Step 5: coal of the drying machine after dry is sent to raw material cabin, the feed coal that combustion furnace is added is controlled by raw material cabin
Amount；
Step 6: ash material collector has certain flying dust to gather materials, returning charge amount is adjusted, guarantees that returning charge amount and flying dust yield are flat
Weighing apparatus；
Step 7: opening ash-slag disposal system after there is certain piling height in lime-ash carbon residue combustion chamber, slowly it is discharged centainly
Lime-ash guarantees lime-ash balance.
Embodiment two is based on embodiment one, preferably, the third step guarantees that the indoor oxygen content of burning is
Between 85% to 100%.
Embodiment three is based on embodiment two, preferably, the third step guarantees that the indoor oxygen content of burning is
95%。
Embodiment four, for a kind of a kind of combustion furnace of burning process described in embodiment one, including lagging casing
13 and coal feeding pipe road 7, set that there are three warehouses in the lagging casing 13, respectively positioned at bottom lime-ash carbon residue combustion chamber 3,
The combustion chamber 6 communicated on lime-ash carbon residue combustion chamber 3 and with lime-ash carbon residue combustion chamber 3 and flying dust collection and heat recovery room
4；It is communicated between lime-ash carbon residue combustion chamber 3 and flying dust collection and heat recovery room 4 by ash material collector 22；The lime-ash
The boiler feedwater preheating heat exchanger 2 for being provided with water inlet is installed on the outside of carbon residue combustion chamber 3；3 bottom of lime-ash carbon residue combustion chamber
Ignition system 17 and oxygen feeding tube road 1 are installed；One layer of water-cooling wall 8 is on the outside of the combustion chamber 6；The water-cooling wall 8 is provided with
Intercommunicating pore 9 communicates combustion chamber 6 with flying dust collection and heat recovery room 4；Boiler feedwater distributor is connected on the downside of water-cooling wall 8
15；The boiler feedwater distributor 15 is connect with boiler feedwater preheating heat exchanger 2；One vapor collection buffer 10 is mounted on burning
It 6 upper end of room and is connect with water-cooling wall 8；The coal feeding pipe road 7 is communicated with combustion chamber 6, and coal feed point is located at 13 outside of lagging casing；
The flying dust is collected and heat recovery room 4 is equipped with the combustion tail gas pipeline 5 communicated with itself；The combustion tail gas pipeline 5 is another
End is located at 13 outside of lagging casing and connect with air-introduced machine 14.
Embodiment five is based on embodiment four, preferably, the boiler feedwater preheating heat exchanger 2 is that a spiral twines
It is wound on the pipeline of lime-ash carbon residue combustion chamber 3；The pipeline is connect with boiler feedwater preheating heat exchanger 2.
Embodiment six is based on embodiment four, preferably, the water-cooling wall 8 is made of vertical tube 11 and partition 12；Institute
Vertical tube 11 is stated to connect with boiler feedwater preheating heat exchanger 2；Partition 12 is provided with intercommunicating pore 9.
Flying dust is collected and heat recovery room 4 acts on: it is collected and heat recovery ceiling portion in flying dust, flue-gas temperature is higher by 900 ~
500 DEG C (but heating superheated steam enough) more slightly lower than the top temperature of combustion chamber, the temperature of flue gas body gradually decreases from top to bottom,
Preferable with the boiler heat exchange effect of outer cylinder and because flue gas is longer in the region residence time, weight particle flying dust is in this region weight
Power and along gas direction survey drop in revert system；Guarantee that gas is being set in the interior Uniform Flow according to the ability difference of burning
Standby surrounding symmetrically opens offgas outlet, and about 200 DEG C ~ 300 DEG C or so of outlet temperature, and guarantee that there is certain angle in outlet obliquely
Degree, if being flowed in revert system after the flying dust of exhaust pipe can also collect in this way.
Ash material collector 22: the flying dust of collection is being stored in tapered ash material collector, primarily serves sealing because of revert system
It with the connection of combustion chamber, avoids causing gas short-circuit because of connection, cause the accident, and play the role of collecting flying dust.The region
Number big absolutely builds up for pouring material
Revert system 16 can also be added in the present invention: control returning charge amount allows the unburned carbon residue of flying dust to enter lime-ash
Carbon residue combustion chamber 3 burns away, while recycling the thermal energy of flying dust.
Drying system: containing a large amount of latent heat in tail gas, carry out directly contact in the bunker coal that this region is come with adverse current and change
Heat, the basic outer water for removing bunker coal.
The effect of raw material cabin: raw material cabin two effects, one is that a certain number of feed coals of storage are used for combustion furnace, together
When play contacting for sealed combustion chamber and drying system；
15 main function of boiler feedwater distributor: balance boiler, can because temperature difference causes the vapor (steam) temperature generated different
To guarantee that the place of water-cooling wall high-temperature generates saturated vapor and superheated steam, the part of low temperature, which plays preheating and generates saturation, steams
Vapour adequately absorbs all thermal energy of the equipment.
Coal feeding pipe road 7: the fuel of predominantly continuous supply combustion furnace, the pipeline external use water-cooling wall 8, can preheat combustion
Material coal makes the temperature of coal reach 300 DEG C or so, is conducive to raw material burning of coal, while also guaranteeing that raw material will not be because receiving by flying dust
Collection and heat recovery room 4 and 6 temperature of combustion chamber is excessively high that coal is made to cause line clogging in 7 destructive distillation of coal feeding pipe road, while can reduce
The material in coal feeding pipe road 7.
Steam collects buffer 10: playing the high steam for collecting the generation of water-cooling wall 8 for absorbing heat in combustion furnace and rises
To buffer function, while the top of the collection buffer 10 composition combustion furnace, the heat for fully absorbing combustion furnace reach overheat and perseverance
Temperature action.
Claims (6)
1. a kind of burning of coal technique, which comprises the following steps:
Coal is layered in lime-ash carbon residue combustion chamber by the first step；Boiler feedwater enters boiler feedwater preheating heat exchanger, and water-cooling wall changes
Heat pipeline makes pipeline keep water-filling state, the emptying of steam evacuation valve；Returning charge valve is closed；
Step 2: leading to plant air from oxygen jet, opens air-introduced machine and guarantee micro-positive pressure in burner hearth；
Step 3: furnace middle portion temperature is promoted to 750 DEG C with coal gas is gone into operation, furnace bottom temperature is promoted to 650 ~ 850 DEG C；From original
Expect that coal pipeline into coal, closes the coal gas that goes into operation after coals most in furnace are ignite, the temperature of combustion furnace is controlled by plus-minus coal
At 800 ~ 900 DEG C, guarantee in furnace to spray into steam through oxygen jet after accumulation of heat and the culture bed of material, the indoor gas of replacement combustion, to
Furnace bottom temperature is down to 800 or so, slowly send pure oxygen, guarantees indoor oxygen content of burning；Furnace coal weight is adjusted by burner hearth temperature
Degree maintains 900 ~ 950 DEG C and while regulating and guiding blower, guarantee burner hearth tiny structure, by air-introduced machine with the work for adjusting flue gas flow rate
With keeping the steam heat-exchanging efficiency for collecting buffer different, guarantee the temperature of steam (vapor) outlet；Water in pipeline is preheated through boiler feedwater
It is sent after heat exchanger and the preheating of lime-ash carbon residue combustion chamber to boiler feedwater distributor and is sent to flying dust collection and heat recovery room and combustion
Room water-cooling wall is burnt, enters superheat section through combustion chamber, the steam that flying dust is collected and heat recovery room water-cooling wall generates and steam is collected
After buffer reheats, high temperature and high pressure steam is generated for users to use；
Step 4: tail gas is entered in drying machine by the extraction of air-introduced machine and coal is dried to drying machine continuously into coal,
And the tail gas after drying is dusted, washing, desulfurization；
Step 5: coal of the drying machine after dry is sent to raw material cabin, the amount that the feed coal of combustion furnace is added is controlled by raw material cabin；
Step 6: ash material collector has certain flying dust to gather materials, returning charge amount is adjusted, guarantees that returning charge amount and flying dust yield balance；
Step 7: opening ash-slag disposal system after there is certain piling height in lime-ash carbon residue combustion chamber, certain ash being slowly discharged
Slag guarantees lime-ash balance.
2. a kind of burning process according to claim 1, it is characterised in that: the third step guarantees that the indoor oxygen of burning contains
Amount is between 85% to 100%.
3. a kind of burning process according to claim 2, it is characterised in that: the third step guarantees that the indoor oxygen of burning contains
Amount is 95%.
4. being used for a kind of a kind of combustion furnace of burning process described in claim 1, including lagging casing (13) and coal feeding pipe
Road (7), it is characterised in that: warehouse there are three setting in the lagging casing (13), respectively the lime-ash carbon residue positioned at bottom are burnt
Room (3) is located on lime-ash carbon residue combustion chamber (3) and the combustion chamber (6) communicated with lime-ash carbon residue combustion chamber (3) and flying dust are collected
And heat recovery room (4)；It is received between lime-ash carbon residue combustion chamber (3) and flying dust collection and heat recovery room (4) by ash material
Storage (22) communicates；The boiler feedwater preheating heat exchanger for being provided with water inlet is installed on the outside of lime-ash carbon residue combustion chamber (3)
(2)；Lime-ash carbon residue combustion chamber (3) bottom is equipped with ignition system (17) and oxygen feeding tube road (1)；The combustion chamber (6)
Outside is with one layer of water-cooling wall (8)；The water-cooling wall (8), which is provided with intercommunicating pore (9), returns combustion chamber (6) and flying dust collection and heat
Room (4) are received to communicate；Boiler feedwater distributor (15) are connected on the downside of water-cooling wall (8)；The boiler feedwater distributor (15) and pot
Furnace feed-water preheating heat exchanger (2) connection；One vapor collection buffer (10) be mounted on combustion chamber (6) upper end and with water-cooling wall (8)
Connection；The coal feeding pipe road (7) communicates with combustion chamber (6), and coal feed point is located on the outside of lagging casing (13)；The flying dust is collected
And heat recovery room (4) are equipped with the combustion tail gas pipeline (5) communicated with itself；Combustion tail gas pipeline (5) other end is located at
It is connect on the outside of lagging casing (13) and with air-introduced machine (14).
5. a kind of combustion furnace according to claim 4, it is characterised in that: the boiler feedwater preheating heat exchanger (2) is one
It is spirally wound on the pipeline of lime-ash carbon residue combustion chamber (3)；The pipeline is connect with boiler feedwater preheating heat exchanger (2).
6. a kind of combustion furnace according to claim 4, it is characterised in that: the water-cooling wall (8) is by vertical tube (11) and partition
(12) it constitutes；The vertical tube (11) connect with boiler feedwater preheating heat exchanger (2)；Partition (12) is provided with intercommunicating pore (9).
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| CN201510871929.6A CN106838861B (en) | 2015-12-03 | 2015-12-03 | A kind of burning of coal technique and its combustion furnace |
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| CN106838861B true CN106838861B (en) | 2019-04-12 |
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| CN109002687B (en) * | 2018-08-02 | 2020-12-01 | 国家能源投资集团有限责任公司 | Method for determining ash share of circulating fluidized bed boiler based on calcium balance |
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|---|---|---|---|---|
| CN2086376U (en) * | 1990-07-04 | 1991-10-09 | 李水生 | Multi-layer blast chamber formed coal boiler |
| CA2096323A1 (en) * | 1992-05-22 | 1993-11-23 | Ernest Ludwig Daman | Staged furnaces for firing coal pyrolysis gas and char |
| CN1916490A (en) * | 2006-08-15 | 2007-02-21 | 周开根 | Smokeless burning technique and equipment with fire fontanel being setup inside furnace |
| CN101038106A (en) * | 2007-05-15 | 2007-09-19 | 李玉臣 | Vertical atmospheric superconductive quick heat supply boiler |
-
2015
- 2015-12-03 CN CN201510871929.6A patent/CN106838861B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2086376U (en) * | 1990-07-04 | 1991-10-09 | 李水生 | Multi-layer blast chamber formed coal boiler |
| CA2096323A1 (en) * | 1992-05-22 | 1993-11-23 | Ernest Ludwig Daman | Staged furnaces for firing coal pyrolysis gas and char |
| CN1916490A (en) * | 2006-08-15 | 2007-02-21 | 周开根 | Smokeless burning technique and equipment with fire fontanel being setup inside furnace |
| CN1916490B (en) * | 2006-08-15 | 2012-07-04 | 周开根 | Smokeless burning technique and equipment with fire fontanel being setup inside furnace |
| CN101038106A (en) * | 2007-05-15 | 2007-09-19 | 李玉臣 | Vertical atmospheric superconductive quick heat supply boiler |
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Effective date of registration: 20211213 Address after: Songlin community, Huashan street, Zhanyi District, Qujing City, Yunnan Province Patentee after: YUNNAN DAWEI COKE Co.,Ltd. Address before: 655000 No. 1, floor 1, building 20, Huashan Road, Panjiang Town, Zhanyi County, Qujing City, Yunnan Province Patentee before: Yan Tingshu |