CN103232873B - High-sodium coal alkali-metal-removing treatment system - Google Patents
High-sodium coal alkali-metal-removing treatment system Download PDFInfo
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- CN103232873B CN103232873B CN201310004356.8A CN201310004356A CN103232873B CN 103232873 B CN103232873 B CN 103232873B CN 201310004356 A CN201310004356 A CN 201310004356A CN 103232873 B CN103232873 B CN 103232873B
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Abstract
The invention relates to a high-sodium coal alkali-metal-removing treatment system comprising a sodium-removing treatment system, a finished product material collection system, a precipitated sodium condensation and recovery system, and a flue gas dedusting system. An upper outlet port of a sodium-removing reactor in the sodium-removing treatment system communicates with a primary separator of the finished product material collection system. The treatment system is characterized in that an exhaust gas combustion system is placed before or after the precipitated sodium condensation and recovery system. The process and system provided by the invention have the advantages of flexible and reliable system, wide adjustment range of reactor operation temperature, good sodium-removing effect, high system reliability, low system heat loss, and high finished product yield. With the treatment system, finished product particle size control, exhaust gas heat sufficient utilization, in-furnace high-efficiency sulfur removing, and the like can be reliably realized.
Description
Technical field
The present invention relates to high sodium coal alkali metal and remove treatment technology, particularly a kind of high sodium coal removes alkali metal treated system.
Background technology
Through exploration, China is the high sodium coal (Na in coal ash in Xinjiang region especially
2o content is greater than 6%) aboundresources, only approximately 3,900 hundred million tons of high sodium content coal resources are just being contained in accurate eastern coalfield, calculate with the current coal annual production of China, and an eastern coalfield of standard is just used 100 years in enough whole nations.
But research shows, no matter, aspect burning or gasification, high sodium coal all affects it because of sodium content height and reliably utilizes.Its former because: Na
2o belongs to volatile substances, at high temperature, after volatilization, easily condenses in the ash deposition that forms sintering or bonding on heating surface, and this class deposition mostly occurs on afterbody convection heating surface, and forms slagging scorification source.At present, near build the eastern coalfield of standard multiple electric power stations near coal-mines have in succession produced afterbody convection heating surface and have stain the serious phenomenon of dust stratification in the time using accurate eastern coal, affect boiler heat-transfer, have reduced the overall operation reliability of boiler unit; And aspect gasification, because the sodium in coal is the essential mineral prime element that causes ash erosion and deposit attack in coal gasification and combustion process, pyrolysis and gasification reaction to coal impact.Therefore, high sodium low-order coal can not be directly used in gasifying process, must carry out pretreatment.
Aspect burning, the utilization of the existing high sodium low-order coal modes of burning or adding catalyst of mixing that adopt more.By mixing the mode of burning, can realize the part utilization of high sodium low-order coal, but long-term mixed-fuel burning proportion is less than 30% conventionally, be difficult to extensive reliable utilization; By adding the mode of catalyst, although substantially realized the trouble-free burning of high sodium low-order coal, need the high catalyst of input price, not only improve it and utilized cost, and increased system complex degree.
Summary of the invention
In order to realize extensive reliable utilization of high sodium coal, the object of the present invention is to provide a kind of high sodium coal to remove alkali metal treated system, this system has that de-sodium is effective, finished product stable in properties and productive rate is high, readymade coal caloric value changes the outstanding advantages such as little, the utilization of can directly burning or gasify of readymade coal after de-sodium upgrading, fundamentally solves the technical barrier that high sodium coal is difficult to large-scale industry utilization.
In order to achieve the above object, the present invention is by the following technical solutions:
A kind of high sodium coal removes alkali metal treated system, comprise de-sodium treatment system, finished product materials gathering system, precipitated sodium condensate recovery system and flue gas dust collecting system, de-sodium reactor 12 top outlets in de-sodium treatment system are connected with the primary separator 6 in finished product materials gathering system, it is characterized in that, weary gas firing system be arranged at precipitated sodium condensate recovery system before or after, when weary gas firing system be arranged at precipitated sodium condensate recovery system before time, weary gas firing system entry connects the outlet of de-sodium treatment system and finished product materials gathering system, weary gas firing system outlet connects precipitated sodium condensate recovery system, left and right twin flue outlet in precipitated sodium condensate recovery system is connected with the deduster 25 in flue gas dust collecting system, when be arranged at precipitated sodium condensate recovery system after time, finished product materials gathering system is connected with precipitated sodium condensate recovery system, de-sodium treatment system is established entrance with the outlet of precipitated sodium condensate recovery system with weary gas firing system and is connected, and weary gas firing system connects the deduster 25 in flue gas dust collecting system.
Described de-sodium treatment system comprises the de-sodium reactor 12 as main body, middle part or the bottom of described de-sodium reactor 12 arrange coal feeding hole, coal-fired 11 enter de-sodium reactor 12 by Belt Conveying to run coal bin 10, de-sodium reactor 12 bottoms are provided with adiabatic air compartment 16, de-sodium reactor 12 side lower parts are connected with 14 imports of coarse granule cooler by coarse granule finished product discharge gate 15, the outlet of sodium reactor top is connected with the primary separator 6 of finished product materials gathering system, primary separator 6 top outlets are connected with second-stage separator 7 entrances, primary separator 6 lower part outlets are communicated with level fine grained cooler 17, second-stage separator 7 lower part outlets are communicated with secondary fine grained cooler 18, coarse granule cooler 14, one-level fine grained cooler 17 is all connected with finished conveying device 13 with secondary fine grained cooler 18,
Described weary gas firing system comprises weary gas burning furnace 8, weary gas burning furnace 8 is adiabatic furnace, the middle and lower part of weary gas burning furnace 8 is provided with respectively the weary gas that is connected with de-sodium reactor 12 and second-stage separator 7 to entrance, run coal bin 10, the weary gas burning furnace slag cooler 20 and the feedback outlet that are connected with slag-drip opening, and gas burning furnace 8 bottoms arrange weary gas burning furnace air compartment 19; The exhanst gas outlet on the top of described weary gas burning furnace 8 enters precipitated sodium condensate recovery system by separator 9, and separator 9 bottoms are provided with weary gas burning furnace fluidized air blower 21; Described precipitated sodium condensate recovery system is totally two covers, adopt left and right twin flue, left flue 23 is all connected with pressure fan 22 with right flue 24 air inlets, left flue 23 exports with the deduster 25 in flue gas dust collecting system and is connected with right flue 24, deduster 25 is connected to chimney 27 by blower fan 26, left flue 23 and interior air preheater or wall-cooling surface or the economizer all arranged of right flue 24.
Described precipitated sodium condensate recovery system is totally two covers, adopts left and right twin flue, and second-stage separator 7 top outlets are connected with twin flue, and left flue 23 is all connected with pressure fan 22 with right flue 24 air inlets; The middle and lower part of the weary gas burning furnace 8 in weary gas firing system is provided with the weary gas being connected with de-sodium reactor 12 and precipitated sodium condensate recovery system respectively to entrance, run coal bin 10 and feedback outlet, run coal bin 10 is communicated with fire coal 11, and gas burning furnace 8 bottoms arrange weary gas burning furnace air compartment 19; The exhanst gas outlet on the top of described weary gas burning furnace 8 is connected with the deduster 25 in flue gas dust collecting system by separator 9, and deduster 25 is connected to chimney 27 by blower fan 26.
Described deduster 25 adopts electric cleaner or sack cleaner or electrostatic fabric filter.
Described primary separator 6 can adopt cyclone separator or inertia separator with second-stage separator 7.
Described coarse granule cooler 14 adopts water cold drum formula or water-cooled moving bed cooler or water-cooled scraper plate cooler.
Described one-level fine grained cooler 17 can adopt water cold drum formula or water-cooled moving bed cooler with secondary fine grained cooler 18.
Described weary gas burning furnace 8 can adopt adiabatic furnace or arrange a little wall-cooling surface.Described weary gas burning furnace 8 arranges desulfuration in furnace lime stone to entrance, realizes desulfuration in furnace.Described weary gas burning furnace 8 arranges material returning device.
Described weary gas burning furnace 8 arranges desulfuration in furnace system, and the entrance of desulfurizing agent can be arranged in material returning device or burner hearth middle and lower part.
Described fine grained finished product adopts adiabatic separator separation and collection, separator arrangement single-stage, two-stage or multistage.
The chamber structure of described weary gas firing system can adopt recirculating fluidized bed or bubbling fluidized bed.
Described left flue 23 and right flue 24 can vertical or horizontal layouts, and heating surface can or be staggered in arrangement along row.
Described finished conveying device 13 adopts drag conveyor or bucket conveyor.
Described finished conveying device 13 carries out cooling by water.
The coarse granule finished product discharge gate of described de-sodium reactor 12 is arranged on sidepiece or the bottom of reactor.
Described coal feeding hole is arranged on bottom or the middle part of de-sodium reactor 12.
The ignition temperature of described weary gas burning furnace 8 can be controlled between 700-1200 DEG C.
The equal capable of regulating of reaction temperature, thermal source and velocity of flue gas of described de-sodium reactor 12.Institute's calorific requirement of described de-sodium reactor 12 can be provided by self, or adopts external thermal source.The reaction temperature of reactor 12 is at 400 DEG C～1200 DEG C.
The velocity of flue gas of described de-sodium reactor (12) is at 1m/s～10m/s.Reactor 12 can normal pressure or pressurization operation.
According to the present invention, described fine granular materials is collected through separator by taking off the outlet of sodium reactor top, preferably two-stage separator, and as primary separator 6 and second-stage separator 7, described primary separator 6 top outlets are connected with second-stage separator 7 entrances.
The present invention has the following advantages:
1, both can adopt id reaction heat release to meet system heat absorption requirement, also can adopt external thermal source, system flexibility and reliability;
2, reactor running temperature adjusting range is wide, and de-sodium is effective, can meet multiple instructions for use;
3, reactor adopts adiabatic layout, and system heat loss is little;
4, system adopts one-level, two-stage or multi-stage separation device, and finished product yield is high;
5, reactor velocity of flue gas adjusting range is wide, can reliably realize product grading control;
6, weary gas heat obtains and makes full use of;
7, weary gas firing process implementation desulfuration in furnace, reduces desulphurization cost;
8, two cover precipitated sodium condensate recovery systems, feasible system moves continuously.
Brief description of the drawings
Fig. 1 is flow sheet of the present invention.
Fig. 2 is the second flow sheet of the present invention.
Fig. 3 is the 3rd flow sheet of the present invention.
Detailed description of the invention
Embodiment mono-
As shown in Figure 1:
A kind of high sodium coal removes alkali metal treated system, comprise de-sodium treatment system, finished product materials gathering system, precipitated sodium condensate recovery system, flue gas dust collecting system, de-sodium reactor 12 top outlets in de-sodium treatment system are connected with the primary separator 6 in finished product materials gathering system, it is characterized in that, weary gas firing system be arranged at precipitated sodium condensate recovery system before or after, when weary gas firing system be arranged at precipitated sodium condensate recovery system before time, weary gas firing system entry connects the outlet of de-sodium treatment system and finished product materials gathering system, weary gas firing system outlet connects precipitated sodium condensate recovery system, left and right twin flue outlet in precipitated sodium condensate recovery system is connected with the deduster 25 in flue gas dust collecting system,
Described de-sodium treatment system comprises the de-sodium reactor 12 as main body, middle part or the bottom of described de-sodium reactor 12 arrange coal feeding hole, de-sodium reactor 12 bottoms are provided with adiabatic air compartment 16, de-sodium reactor 12 side lower parts are connected with 14 imports of coarse granule cooler by coarse granule finished product discharge gate 15, the outlet of sodium reactor top is connected with the primary separator 6 of finished product materials gathering system, primary separator 6 top outlets are connected with second-stage separator 7 entrances, primary separator 6 lower part outlets are communicated with level fine grained cooler 17, second-stage separator 7 lower part outlets are communicated with secondary fine grained cooler 18, coarse granule cooler 14, one-level fine grained cooler 17 is all connected with finished conveying device 13 with secondary fine grained cooler 18, finally send into finished stock storage workshop or other position.
Described weary gas firing system comprises weary gas burning furnace 8, weary gas burning furnace 8 is adiabatic furnace, the middle and lower part of weary gas burning furnace 8 is provided with the weary gas being connected with de-sodium reactor 12 and second-stage separator 7 respectively to entrance, run coal bin 10 and feedback outlet, run coal bin 10 is communicated with fire coal 11, and gas burning furnace 8 bottoms arrange weary gas burning furnace air compartment 19; The exhanst gas outlet on the top of described weary gas burning furnace 8 enters precipitated sodium condensate recovery system by separator 9, and separator 9 bottoms are provided with weary gas burning furnace fluidized air blower 21.
Described precipitated sodium condensate recovery system is totally two covers, adopt left and right twin flue, left flue 23 is all connected with pressure fan 22 with right flue 24 air inlets, left flue 23 exports with the deduster 25 in flue gas dust collecting system and is connected with right flue 24, deduster 25 is connected to chimney 27 by blower fan 26, left flue 23 and interior air preheater or wall-cooling surface or the economizer all arranged of right flue 24, when after flue gas cool-down, precipitated sodium is by condensation and accumulate in flying dust and be recovered.Flue gas enters atmosphere after finally processing via dust pelletizing system.
Embodiment bis-
As shown in Figure 2, a kind of high sodium coal removes alkali metal treated system, comprise de-sodium treatment system, finished product materials gathering system, precipitated sodium condensate recovery system, flue gas dust collecting system, de-sodium reactor 12 top outlets in de-sodium treatment system are connected with the primary separator 6 in finished product materials gathering system, it is characterized in that, after weary gas firing system is arranged at precipitated sodium condensate recovery system, finished product materials gathering system is connected with precipitated sodium condensate recovery system, de-sodium treatment system is established entrance with the outlet of precipitated sodium condensate recovery system with weary gas firing system and is connected, weary gas firing system connects the deduster 25 in flue gas dust collecting system.
Described de-sodium treatment system comprises the de-sodium reactor 12 as main body, middle part or the bottom of described de-sodium reactor 12 arrange coal feeding hole, de-sodium reactor 12 bottoms are provided with adiabatic air compartment 16, de-sodium reactor 12 side lower parts are connected with 14 imports of coarse granule cooler by coarse granule finished product discharge gate 15, the outlet of sodium reactor top is connected with the primary separator 6 of finished product materials gathering system, primary separator 6 top outlets are connected with second-stage separator 7 entrances, primary separator 6 lower part outlets are communicated with level fine grained cooler 17, second-stage separator 7 lower part outlets are communicated with secondary fine grained cooler 18, coarse granule cooler 14, one-level fine grained cooler 17 is all connected with finished conveying device 13 with secondary fine grained cooler 18, finally send into finished stock storage workshop or other position.
Described precipitated sodium condensate recovery system is totally two covers, adopts left and right twin flue, and second-stage separator 7 top outlets are connected with twin flue, and left flue 23 is all connected with pressure fan 22 with right flue 24 air inlets,
Described weary gas firing system comprises weary gas burning furnace 8, weary gas burning furnace 8 is adiabatic furnace, the middle and lower part of weary gas burning furnace 8 is provided with the weary gas being connected with de-sodium reactor 12 and precipitated sodium condensate recovery system respectively to entrance, run coal bin 10 and feedback outlet, run coal bin 10 is communicated with fire coal 11, and gas burning furnace 8 bottoms arrange weary gas burning furnace air compartment 19; The exhanst gas outlet on the top of described weary gas burning furnace 8 is connected with the deduster 25 in flue gas dust collecting system by separator 9, deduster 25 is connected to chimney 27 by blower fan 26, left flue 23 and interior air preheater or wall-cooling surface or the economizer all arranged of right flue 24, flue gas enters atmosphere after finally processing via dust pelletizing system.
Embodiment tri-
As shown in Figure 3, a kind of high sodium coal removes alkali metal treated system, comprises de-sodium treatment system, finished product materials gathering system, weary gas firing system, precipitated sodium condensate recovery system and flue gas dust collecting system.
De-sodium treatment system main body is de-sodium reactor 12, the middle and lower part of described de-sodium reactor 12 arranges coal feeding hole, the bottom of described de-sodium reactor 12 is provided with adiabatic air compartment 16, the side lower part of described de-sodium reactor 12 is provided with coarse granule finished product discharge gate, and coarse granule discharge gate is connected with 13 imports of coarse granule cooler.De-sodium treatment system outlet is connected with the import of finished product materials gathering system.
Finished product materials gathering system mainly comprises primary separator 6 and second-stage separator 7, the import of described primary separator 6 is connected with the outlet of de-sodium reactor 12, primary separator 6 bottoms arrange discharge gate and are connected with the import of one-level fine grained cooler 17, the outlet of primary separator top is connected with second-stage separator 7 entrances, second-stage separator 7 bottoms arrange discharge gate and are connected with secondary fine grained cooler 18, second-stage separator 7 tops arrange fume emission mouth, enter precipitated sodium condensate recovery system containing the flue gas of precipitated sodium.
Precipitated sodium condensate recovery system is totally two covers, mainly comprises in left flue 23, right flue 24, two cover flues and all arranges air preheater or economizer, and when after flue gas cool-down, precipitated sodium is by condensation and accumulate in flying dust and be recovered.Weary gas after precipitated sodium condensation process enters existing boiler and burns, and after burning, after existing smoke processing system is processed, discharges.
Operation principle of the present invention is: after undressed high sodium coal 1 is processed by crushing and screening device 2, be delivered to run coal bin 4 by elevator 3, send into the middle and lower part of reactor 12 through being arranged on the feeder 5 of run coal bin below, after high sodium coal reacts in de-sodium reactor 12, the alkali metal such as most of sodium, moisture and part Volatile enter flue gas, readymade coal is after treatment with coarse granule finished product, one-level fine grained finished product and three kinds of forms of secondary fine grained finished product are through coarse granule finished product cooler 13, after one-level fine grained finished product cooler 17 is cooling with secondary fine grained finished product cooler 18, become final finished product.And the flue gas that contains precipitated sodium and certain calorific value enters weary gas firing system, by desulfuration in furnace system, lime stone is sent into weary gas burning furnace 8, at the process implementation desulfuration in furnace of burning, the flue gas of being discharged by weary gas incinerator enters precipitated sodium condensate recovery system.In normal course of operation, left flue 23 or right flue 24 put into operation, and the opposing party, in stand-by state, can be switched at any time.In the removal process of precipitated sodium, will cause the coking of flue internal heating surface, when coking is to a certain extent time, switch to another flue, the system that realizes is moved continuously.Flue gas is finally via entering atmosphere after deduster 25.
Claims (8)
1. one kind high sodium coal removes alkali metal treated system, comprise de-sodium treatment system, finished product materials gathering system, precipitated sodium condensate recovery system, flue gas dust collecting system, de-sodium reactor (12) top outlet in de-sodium treatment system is connected with the primary separator (6) in finished product materials gathering system, it is characterized in that, weary gas firing system be arranged at precipitated sodium condensate recovery system before or after, when weary gas firing system be arranged at precipitated sodium condensate recovery system before time, weary gas firing system entry connects the outlet of de-sodium treatment system and finished product materials gathering system, weary gas firing system outlet connects precipitated sodium condensate recovery system, left and right twin flue outlet in precipitated sodium condensate recovery system is connected with the deduster (25) in flue gas dust collecting system, when be arranged at precipitated sodium condensate recovery system after time, finished product materials gathering system is connected with precipitated sodium condensate recovery system, de-sodium treatment system is established entrance with the outlet of precipitated sodium condensate recovery system with weary gas firing system and is connected, and weary gas firing system connects the deduster (25) in flue gas dust collecting system,
Described de-sodium treatment system comprises the de-sodium reactor (12) as main body, middle part or the bottom of described de-sodium reactor (12) arrange coal feeding hole, coal-fired (11) enter de-sodium reactor (12) by Belt Conveying to coal feeding hole (10), de-sodium reactor (12) bottom is provided with adiabatic air compartment (16), de-sodium reactor (12) side lower part is connected with coarse granule cooler (14) import by coarse granule finished product discharge gate (15), the outlet of sodium reactor top is connected with the primary separator (6) of finished product materials gathering system, the outlet of primary separator (6) top is connected with second-stage separator (7) entrance, primary separator (6) lower part outlet is communicated with level fine grained cooler (17), second-stage separator (7) lower part outlet is communicated with secondary fine grained cooler (18), coarse granule cooler (14), one-level fine grained cooler (17) is all connected with finished conveying device (13) with secondary fine grained cooler (18),
Described weary gas firing system comprises weary gas burning furnace (8), weary gas burning furnace (8) is adiabatic furnace, the middle and lower part of weary gas burning furnace (8) is provided with respectively the weary gas that is connected with de-sodium reactor (12) and second-stage separator (7) to entrance, coal feeding hole (10), the weary gas burning furnace slag cooler (20) and the feedback outlet that are connected with slag-drip opening, weary gas burning furnace air compartment (19) is set bottom gas burning furnace (8); The exhanst gas outlet on the top of described weary gas burning furnace (8) enters precipitated sodium condensate recovery system by separator (9), and separator (9) bottom is provided with weary gas burning furnace fluidized air blower (21); Described precipitated sodium condensate recovery system is totally two covers, adopt left and right twin flue, left flue (23) is all connected with pressure fan (22) with right flue (24) air inlet, left flue (23) is connected with the deduster (25) in flue gas dust collecting system with right flue (24) outlet, deduster (25) is connected to chimney (27) by blower fan (26), in left flue (23) and right flue (24), all arranges air preheater or wall-cooling surface or economizer.
2. the high sodium coal of one according to claim 1 removes alkali metal treated system, it is characterized in that, described precipitated sodium condensate recovery system is totally two covers, adopt left and right twin flue, the outlet of second-stage separator (7) top is connected with twin flue, and left flue (23) is all connected with pressure fan (22) with right flue (24) air inlet; The middle and lower part of the weary gas burning furnace (8) in weary gas firing system is provided with the weary gas being connected with de-sodium reactor (12) and precipitated sodium condensate recovery system respectively to entrance, coal feeding hole (10) and feedback outlet, coal feeding hole (10) is communicated with coal-fired (11), and gas burning furnace (8) bottom arranges weary gas burning furnace air compartment (19); The exhanst gas outlet on the top of described weary gas burning furnace (8) is connected with the deduster (25) in flue gas dust collecting system by separator (9), and deduster (25) is connected to chimney (27) by blower fan (26).
3. the high sodium coal of one according to claim 1 and 2 removes alkali metal treated system, it is characterized in that, described deduster (25) adopts electric cleaner or sack cleaner or electrostatic fabric filter.
4. the high sodium coal of one according to claim 1 and 2 removes alkali metal treated system, it is characterized in that, described primary separator (6) adopts cyclone separator or inertia separator with second-stage separator (7).
5. the high sodium coal of one according to claim 1 and 2 removes alkali metal treated system, it is characterized in that, described coarse granule cooler (14) adopts water cold drum formula or water-cooled moving bed cooler or water-cooled scraper plate cooler.
6. the high sodium coal of one according to claim 1 and 2 removes alkali metal treated system, it is characterized in that, described one-level fine grained cooler (17) adopts water cold drum formula or water-cooled moving bed cooler with secondary fine grained cooler (18).
7. the high sodium coal of one according to claim 1 and 2 removes alkali metal treated system, it is characterized in that, described weary gas burning furnace (8) adopts adiabatic furnace or arranges a little wall-cooling surface, described weary gas burning furnace (8) arranges desulfuration in furnace lime stone to entrance, realizes desulfuration in furnace.
8. the high sodium coal of one according to claim 1 and 2 removes alkali metal treated system, it is characterized in that, described left flue (23) is vertical or horizontal layout with right flue (24), and heating surface is along being listed as or being staggered in arrangement.
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| CN202465627U (en) * | 2012-01-31 | 2012-10-03 | 上海机易电站设备有限公司 | High-sodium coal ash washing and sodium removing system |
| CN102533383B (en) * | 2012-02-23 | 2013-08-21 | 上海机易电站设备有限公司 | Sodium-removing purification cyclic system of high-sodium coal |
| CN102660347B (en) * | 2012-05-08 | 2013-09-11 | 中国五环工程有限公司 | Process for removing sodium in high-sodium coal and system thereof |
| CN102829473B (en) * | 2012-09-25 | 2016-02-03 | 中国东方电气集团有限公司 | A kind of pyrolysis and combustion double bed solves the system that high sodium coal combustion stains |
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