CN115164187A - Distributed furnace slag tapping device for reducing contamination of eastern Junggar coal to boiler - Google Patents
Distributed furnace slag tapping device for reducing contamination of eastern Junggar coal to boiler Download PDFInfo
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- CN115164187A CN115164187A CN202210736899.8A CN202210736899A CN115164187A CN 115164187 A CN115164187 A CN 115164187A CN 202210736899 A CN202210736899 A CN 202210736899A CN 115164187 A CN115164187 A CN 115164187A
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- 239000003245 coal Substances 0.000 title claims abstract description 64
- 239000002893 slag Substances 0.000 title claims abstract description 49
- 238000011109 contamination Methods 0.000 title claims abstract description 20
- 238000010079 rubber tapping Methods 0.000 title abstract description 6
- 230000007704 transition Effects 0.000 claims abstract description 12
- 238000002485 combustion reaction Methods 0.000 claims description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 7
- 239000003546 flue gas Substances 0.000 claims description 7
- 239000011819 refractory material Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 2
- 239000003513 alkali Substances 0.000 abstract description 14
- 238000005516 engineering process Methods 0.000 abstract description 4
- 235000000939 Santalum acuminatum Nutrition 0.000 abstract 1
- 244000174879 Santalum acuminatum Species 0.000 abstract 1
- 238000002156 mixing Methods 0.000 abstract 1
- 238000010186 staining Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 18
- 229910052783 alkali metal Inorganic materials 0.000 description 10
- 150000001340 alkali metals Chemical class 0.000 description 10
- 239000002956 ash Substances 0.000 description 9
- 239000002245 particle Substances 0.000 description 7
- 238000007599 discharging Methods 0.000 description 6
- 238000001179 sorption measurement Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 4
- 229910052700 potassium Inorganic materials 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- -1 Na and K Chemical class 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910000323 aluminium silicate Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 206010022000 influenza Diseases 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000003181 co-melting Methods 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
- F23J1/06—Mechanically-operated devices, e.g. clinker pushers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/54—De-sludging or blow-down devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
- F22G1/02—Steam superheating characterised by heating method with heat supply by hot flue gases from the furnace of the steam boiler
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/08—Cooling thereof; Tube walls
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
Abstract
A distributed furnace slag tapping device for reducing eastern Junggar coal to staining the boiler. When the existing coal-fired unit burns Xinjiang quandong high-alkali coal, the technology of gasifying or blending weak-alkali coal can slow down slagging contamination, and the contamination and slagging of high-alkali coal cannot be radically controlled. The invention comprises the following components: boiler furnace, boiler furnace includes upper portion furnace (11), lower part furnace (1), 2 distributed furnace (2) have been arranged respectively to lower part furnace bottom, distributed furnace symmetrical arrangement is in lower part furnace's both sides, 2 individual distributed furnace is connected with lower part furnace through transition flue (12) respectively, install in the transition flue and congeal slag tube bank (7), a set of whirl pulverized coal burner (3) are installed at distributed furnace top, the breeze that whirl pulverized coal burner corresponds is introduced with overgrate air entry (5) by combustor primary air entry (4) and combustor overgrate air entry (5) respectively with the overgrate air, slag-trap (6) are installed to distributed furnace bottom. The invention is used for the slag tapping distributed hearth boiler.
Description
Technical Field
The invention relates to a distributed hearth slag tapping device for reducing contamination of east Junggar coal to a boiler.
Background
The high-alkali coal in China has huge reserves and strong combustion activity, is mainly distributed in eastern regions of Xinjiang Junger, has proven reserves of 2136 hundred million tons, has predicted reserves of 3900 hundred million tons, is the largest integral coal field in China, has high contents of alkali metal and alkaline earth metal in the Xinjiang Junger coal, and has serious operation problems of hearth slagging, boiler heating surface contamination, overhigh temperature and the like in the direct combustion process of a pulverized coal boiler in a thermal power plant, so that the boiler cannot operate stably for a long time, and the efficient utilization of Jungang high-alkali coal resources is greatly limited;
at present, when the high-alkali coal in Xinjiang east is combusted by a coal-fired unit in the prior art, the difficult problem of slag formation and contamination of the high-alkali coal in Xinjiang east is relieved mainly by adopting a gasification or blended burning weak-alkali coal technology, the slag formation and contamination can be delayed only, and the boiler can not purely burn the high-alkali coal in Xinjiang east, so that the problem of slag formation and contamination of the high-alkali coal in Xinjiang east can not be radically solved by blended burning.
Disclosure of Invention
The invention aims to provide a distributed hearth liquid slag discharging device for reducing contamination of east Junggar coal to a boiler, which adopts a distributed hearth type and utilizes liquid slag to cooperatively capture alkali metals such as Na and K, and overcomes the defects of slag bonding of a hearth water-cooled wall, serious contamination/dust accumulation/slag bonding on a heating surface and the like when the east Junggar coal is used for burning a solid slag discharging boiler.
The above object is achieved by the following means
A distributed furnace slagging apparatus for reducing boiler contamination from eastern Junggar coal, comprising: the boiler furnace comprises an upper furnace and a lower furnace, wherein 2 distributed furnaces are respectively arranged at the bottom of the lower furnace, the distributed furnaces are symmetrically arranged at two sides of the lower furnace, 2 distributed furnaces are respectively connected with the lower furnace through transition flues, slag condensing tube bundles are arranged in the transition flues, a group of cyclone pulverized coal burners are arranged at the tops of the distributed furnaces, primary air and secondary air corresponding to the cyclone pulverized coal burners are respectively introduced from a primary air inlet of the burners and a secondary air inlet of the burners, and slag wells are arranged at the bottoms of the distributed furnaces;
the lower part of the upper hearth is provided with a layer of over-fire air burner, a screen superheater and a horizontal flue pass/reheater are respectively arranged in the upper part of the upper hearth, the boiler sequentially passes through the lower hearth, the upper hearth, the screen superheater, the horizontal flue pass/reheater and a tail flue along the stroke of flue gas, and the water-cooled wall surfaces of the distributed hearth and the lower hearth are laid with refractory material SiC.
Advantageous effects
1. The invention relates to a liquid slag-discharging distributed hearth boiler technology for burning Junggong coal, which adopts a slag-distributing hearth type, the concentration of fly ash in flue gas entering the tail part of a boiler after high-temperature flue gas passes through a slag-condensing pipe is obviously reduced, and liquid ash is utilized to capture alkali metals such as Na and K in a synergistic manner, so that the defects of slag bonding of a hearth water-cooled wall, dirt/ash accumulation/slag bonding of a heating surface and the like when Junggong coal is burned by a solid slag-discharging boiler are overcome, and the problem of dirt and slag bonding of the high-alkali coal is thoroughly solved.
2. The liquid-state slagging furnace type has the advantages of realizing the pure burning of the Todong coal to generate electricity, greatly improving the economic benefit of coal-electricity enterprises, promoting the utilization of high-alkali coal resources in Xinjiang and reducing the consumption of high-quality electricity-coal resources.
3. The interval of the cyclone pulverized coal burner is compactly arranged, the structural size of the distributed hearth is relatively smaller than that of the diffusion combustion airflow of the cyclone pulverized coal burner, the heat accumulation load in the distributed hearth is higher, the heat absorption capacity of a water-cooled wall is greatly reduced in a refractory material laying area of the distributed hearth, the temperature level in the hearth is improved, the temperature of the hearth is ensured to exceed the flow temperature FT of ash, and the ash in the hearth can be in a liquid molten state.
4. The molten liquid slag has better Na and K trapping capacity, and the ash slag has two forms of physical adsorption and chemical adsorption on alkali metals volatilized from coal, wherein the chemical adsorption is dominant, so that a stable aluminosilicate compound is formed and is not easy to decompose at high temperature, and the alkali metals are prevented from being volatilized into smoke.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 isbase:Sub>A cross-sectional viewbase:Sub>A-base:Sub>A of fig. 1.
Wherein: 1. the system comprises a lower hearth, 2 parts of a distributed hearth, 3 parts of a rotational flow pulverized coal burner, 4 parts of a burner primary air inlet, 5 parts of a burner secondary air inlet, 6 parts of a slag well, 7 parts of a slag condensation tube bundle, 8 parts of an over-fire air burner, 9 parts of a screen superheater, 10 parts of a horizontal flue pass/reheater, 11 parts of an upper hearth, 12 parts of a transition flue, 13 parts of a tail flue.
Detailed Description
Example 1:
a distributed furnace slagging apparatus for reducing boiler contamination from eastern Junggar coal, the method comprising: the boiler furnace comprises an upper furnace 11 and a lower furnace 1, wherein 2 distributed furnaces 2 are respectively arranged at the bottom of the lower furnace, the distributed furnaces are symmetrically arranged at two sides of the lower furnace, 2 distributed furnaces are respectively connected with the lower furnace through a transition flue 12, a slag condensing tube bundle 7 is arranged in the transition flue, a group of cyclone pulverized coal burners 3 are arranged at the top of the distributed furnaces, primary air and secondary air corresponding to the cyclone pulverized coal burners are respectively introduced from a burner primary air inlet 4 and a burner secondary air inlet 5, a slag well 6 is arranged at the bottom of the distributed furnaces, liquid slag in the distributed furnaces is discharged from the slag discharging holes, a plurality of cyclone pulverized coal burners are arranged at the top of each distributed furnace, and the number of the cyclone pulverized coal burners is determined by the capacity of the boiler;
the lower part of upper portion furnace install one deck burn-out air combustor 8, upper portion furnace top inside install respectively and screen superheater 9, horizontal flue cross/reheater 10, the boiler pass through in proper order along the stroke of flue gas lower part furnace upper portion furnace screen superheater horizontal flue cross/reheater, afterbody flue 13, distributed furnace the water-cooling wall of lower part furnace lay refractory material SiC.
The distributed furnace slag tapping method for reducing the contamination of the eastern Junggar coal to the boiler comprises the following steps:
firstly, introducing primary air and secondary air carrying pulverized coal into a rotational flow pulverized coal burner, and jetting the primary air and the secondary air into a distributed hearth during combustion of the rotational flow pulverized coal burner;
according to flow field analysis, strong backflow airflow exists at the outlet of the swirl pulverized coal burner, the backflow airflow sucks pulverized coal for combustion, the amount of oxygen at the front of the nozzle of the swirl pulverized coal burner is sufficient, volatile components are released and combusted rapidly, a large amount of heat is generated, and high temperature generated in a backflow area is also beneficial to ignition and stable combustion of the pulverized coal;
the interval of the swirl pulverized coal burner is compactly arranged, the structural size of the distributed hearth is relatively smaller than that of diffusion combustion airflow of the swirl pulverized coal burner, the heat accumulation load in the distributed hearth is very high, the heat absorption capacity of a water-cooled wall is greatly reduced in a refractory material laying area of the distributed hearth, the temperature level in the hearth is improved to ensure that the temperature exceeds the flowing temperature FT of ash, and the ash in the hearth is in a liquid molten state;
the cyclone pulverized coal burners are compactly arranged at intervals, diffused airflow at the outlets of the burners are mutually collided and mixed to ensure that fuel and air are fully mixed and intensively combusted, pulverized coal particles are combusted in the space of the distributed hearth to ensure that ash slag is dissolved to be in a liquid state, and the pulverized coal particles are thrown to the wall surface of the distributed hearth by the centrifugal force of rotating airflow of the cyclone pulverized coal burners;
liquid slag on the wall surface of the distributed hearth flows downwards under the action of gravity and flows into a slag well, liquid slag particles in airflow of the cyclone pulverized coal burner move along with the airflow and collide with each other to be accumulated into large particles, the large particles enter a transition flue from the distributed hearth, part of the slag particles are separated by inertia under the action of centrifugal force and are collected by the wall surface of the transition flue due to the folding direction of the airflow, and a slag condensing tube bundle is arranged in the transition flue and can continuously collect the liquid slag particles in high-temperature flue gas;
due to the combined action of the liquid slag trapping modes, most of the liquid slag is trapped to the bottom of the burnout chamber and is discharged from a slag well at the bottom of the burnout chamber, the slag trapping rate can reach more than or equal to 70 percent, the fly ash concentration entering a horizontal flue and a tail flue of a boiler is obviously reduced, the contamination strength of a contamination layer on a heating surface is reduced, and the rapid growth phenomenon of the contamination layer caused by low-temperature co-melting of alkali metal in the contamination layer is reduced;
because the liquid state deslagging mode is adopted, the average temperature level in the boiler is higher than that of the conventional solid state deslagging boiler, so that the thermal NO in the cyclone boiler is caused x The generated amount is increased, and NO can be reduced to the maximum extent by creating high-temperature strong reducing atmosphere in the coal combustion process x The stronger the reducing atmosphere, the more favorable the amount of NO produced x Emission reduction;
the excess air coefficient of the distributed furnace hearth and the lower furnace hearth is designed to be 0.8-0.85, a large amount of CO is generated in the area, so that the area presents a strong reducing atmosphere in the combustion process, the rest air amount required by the burnout of unburned components such as CO is supplemented by a burnout air burner, NO x Heterogeneous reduction of bulk NO at the char surface x The emission reduction also plays an important role, and for high-alkali coal, alkali metal Na can effectively inhibit NO generated by burning coal dust x Can generate NO x The discharge is controlled within 200 to 250mg/m 3 Range, at a comparable level of technology to solid slag tapping furnaces;
the molten liquid slag has better trapping capacity on Na, the ash slag has two forms of physical adsorption and chemical adsorption on alkali metals volatilized from coal, wherein the chemical adsorption is dominant to form a stable aluminosilicate compound and is not easy to decompose at high temperature so as to inhibit the alkali metals from volatilizing into flue gas and being trapped by high-temperature slag, part of Na, K, S and other elements in the coal are solidified into the slag through the solidification of the high-temperature slag in the reaction process of the high-alkali coal and the high-temperature slag so as to form a certain amount of enrichment, the Na and the K exist in the liquid slag in an insoluble form, the Na and the K are hardly volatilized any more after being trapped, the trapping rate of the Na reaches more than or equal to 50 percent, and the serious operation problems of hearth slagging, boiler heating surface contamination, overheater overtemperature and the like caused by the high content of the alkali metals such as the Na and the K in the process of directly burning the Oriental coal by a pulverized coal boiler in a power plant are effectively reduced.
Claims (1)
1. A distributed furnace slagging apparatus for reducing boiler contamination from eastern Junggar coal, comprising: boiler furnace, characterized by: the boiler furnace comprises an upper furnace and a lower furnace, wherein 2 distributed furnaces are respectively arranged at the bottom of the lower furnace, the distributed furnaces are symmetrically arranged at two sides of the lower furnace, 2 distributed furnaces are respectively connected with the lower furnace through a transition flue, a slag condensing tube bundle is arranged in the transition flue, a group of cyclone pulverized coal burners are arranged at the tops of the distributed furnaces, primary air and secondary air corresponding to the cyclone pulverized coal burners are respectively introduced from a primary air inlet of the burner and a secondary air inlet of the burner, and a slag well is arranged at the bottom of the distributed furnaces;
the lower part of upper portion furnace install one deck after-combustion air burner, upper portion furnace top inside install respectively and screen superheater, horizontal flue cross/reheater, the boiler pass through in proper order along the stroke of flue gas lower part furnace upper portion furnace screen superheater horizontal flue cross/reheater, afterbody flue, distributed furnace the water-cooling wall of lower part furnace lay refractory material SiC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210736899.8A CN115164187A (en) | 2022-06-27 | 2022-06-27 | Distributed furnace slag tapping device for reducing contamination of eastern Junggar coal to boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210736899.8A CN115164187A (en) | 2022-06-27 | 2022-06-27 | Distributed furnace slag tapping device for reducing contamination of eastern Junggar coal to boiler |
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| Publication Number | Publication Date |
|---|---|
| CN115164187A true CN115164187A (en) | 2022-10-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210736899.8A Pending CN115164187A (en) | 2022-06-27 | 2022-06-27 | Distributed furnace slag tapping device for reducing contamination of eastern Junggar coal to boiler |
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| CN (1) | CN115164187A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115823578A (en) * | 2022-11-24 | 2023-03-21 | 四川川锅锅炉有限责任公司 | Two-stage cyclone liquid slag-condensing boiler for burning high-alkali coal |
-
2022
- 2022-06-27 CN CN202210736899.8A patent/CN115164187A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115823578A (en) * | 2022-11-24 | 2023-03-21 | 四川川锅锅炉有限责任公司 | Two-stage cyclone liquid slag-condensing boiler for burning high-alkali coal |
| CN115823578B (en) * | 2022-11-24 | 2023-11-17 | 四川川锅锅炉有限责任公司 | Two-stage cyclone liquid slag condensing boiler for burning high-alkali coal |
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