CN201756532U - System for lignitic coal or high-volatile coal dry distillation - Google Patents
System for lignitic coal or high-volatile coal dry distillation Download PDFInfo
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- CN201756532U CN201756532U CN2010202466465U CN201020246646U CN201756532U CN 201756532 U CN201756532 U CN 201756532U CN 2010202466465 U CN2010202466465 U CN 2010202466465U CN 201020246646 U CN201020246646 U CN 201020246646U CN 201756532 U CN201756532 U CN 201756532U
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Abstract
The utility model discloses a system for lignitic coal or high-volatile coal dry distillation, in which a main furnace comprises a drying section, a dry distillation section and a coke quenching section. The coal gas is led out from the outlet end of the dry distillation section of the main furnace and connected to the heating process inlet end of a recuperative residue heat exchanger, the coal gas is cooled primarily in a recuperative residue heat exchanger and is connected with a coal gas cooling condensation and purification device through the heating process exit end of the recuperative residue heat exchanger, the purified coal gas outlet of the coal gas cooling condensation and purification device is communicated with an external gas pipe supply pipeline and the cooling process inlet end of the recuperative residue heat exchanger, the cooling process exit end of the recuperative residue heat exchanger is then connected to the cooling process inlet end of a recuperative high-temperature heater, and the cooling process exit end of the recuperative high-temperature heater is communicated with the air inlet of the dry distillation section of the main furnace. The system has a reasonable process structure and ensures that the distillated coal gas can be completely supplied to the exterior, and the supplied coal gas has good quality, and high heating value and application value.
Description
Technical field:
The utility model relates to a kind of dry distillation of coal device.
Background technology:
Coal decomposes under the secluding air condition becomes coal gas, tar and coke destructive distillation products such as (or semicokes), be heated the difference of temperature eventually by coal charge in its stove, it is generally acknowledged that 500-700 ℃ is low-temperature pyrolysis, brown coal class low order coal is applicable to low-temperature pyrolysis processing, process by low-temperature pyrolysis, brown coal are changed into three kinds of products of gas, liquid, solid, have good economic benefits and social benefit.Gas retort is the major equipment in the low-temperature pyrolysis production technique, is divided into external-heat (partition heating) and internal heat type (Direct Contact Heating) by its heat-supplying mode, is divided into gaseous heat-carrier and solid thermal carriers by its used thermal barrier form.
Traditional distillation process mostly is external-heat, to guarantee that coal is by isolated heating, volatility product is not diluted, thereby obtain the dry distillation gas that composition is pure, calorific value is high, better utility value is arranged (for example carrying hydrogen or Coal Chemical Industry unstripped gas), but exist in the stove coal charge inequality of being heated to cause the semicoke quality irregular, the secondary pyrolysis easily takes place and reduces tar yield in high temperature wall district, and the equipment complexity is invested deficiencies such as big production capacity is little;
Internal heat type technology is directly to enter by gaseous heat-carrier (mostly being the flue gas of gas-fired) to pass the heat transfer of block coal seam in the gas retort, have conduct heat fast, efficient is high, homogeneous heating, equipment are simple, investment advantage such as province, but exist dry distillation gas to be diluted by gaseous heat-carrier (flue gas), cause discharged producer gas and outer give gas that calorific value is low, poor quality, commercial exploitation be worth not high shortcoming.
Other has patent (CN101113340A) to be presented in to utilize the direct-fired internal heat type distillation process of cyclic high-temperature coal gas in the shaft furnace, and traditional relatively internal heat type technology improves to some extent.But its suitable type of furnace single (only being applicable to shaft furnace); It is the same with conventional air internal heat type stove to go into the requirement of stove coal, must be lump coal or moulded coal; The purified gas that produces is partly used for hot semicoke cooling and part is used to the concurrent heating of burning, and significantly reduces (only account for whole dry distillation gases 1/3rd) for product coal gas amount then outward; And the gas preheating temperature is too high, and power consumption increases, and the realization of industrialization difficulty increases; Especially thereby used heat accumulating type preheating of this patent or oxygen combustion type of heating will cause dry distillation gas to be diluted by partial fume bringing the same with traditional air-flow internal heat type technology or the same shortcoming of part, the dry distillation gas volume increases, finishing apparatus volume and transmitting power increase thereupon, and the composition that gives gas outward, purity, calorific value etc. are still good not as the gas quality of external-heat technology, value is high; Adopt the heat accumulating type preheating will cause the charging temperature fluctuation big in addition in this patent, the destructive distillation operation is unstable; Adopt the oxygen combustion type of heating then need invest air separation plant, increase investment and running cost.
Summary of the invention:
The purpose of this utility model is to provide a kind of advantage of taking into account external-heat technology in the tradition, and easy handling control is used for brown coal or the pyrogenous system of high volatile coal in the production run.
Technical solution of the present utility model is:
A kind of brown coal or pyrogenous system of high volatile coal of being used for, it is characterized in that: comprise main stove, main stove contains the destructive distillation part, the coal gas that destructive distillation is partly drawn is connected to coal gas cooling condensation and refining plant, the coal gas cooling condensation is connected with the cold journey entrance end of give gas outward pipeline and dividing wall type high temperature heater (HTH) respectively with the gas exit of refining plant, and the cold journey exit end of dividing wall type high temperature heater (HTH) is connected with the destructive distillation partial-air admission mouth of main stove.
The gas exit of coal gas cooling condensation and refining plant through booster fan respectively with outside the give gas cold journey entrance end of pipeline and dividing wall type high temperature heater (HTH) be connected.
After main stove destructive distillation partly is retort section coal gas outlet, be provided with coal gas is carried out dust separating fly-ash separator.
After main stove destructive distillation part coal gas outlet fly-ash separator the dividing wall type afterheat heat exchanger is set, its hot journey entrance end is connected with the fly-ash separator outlet, and hot journey exit end is connected with the refining plant entrance end with the coal gas cooling condensation; Its cold journey entrance end is connected with refining plant outlet or booster fan outlet with the coal gas cooling condensation, and cold journey exit end is connected with the cold journey entrance end of dividing wall type high temperature heater (HTH).
Be provided with the withering main stove drying nest of coal charge before the main stove destructive distillation part, main stove drying nest is connected with the drying source gas circulation loop, drying source gas circulation loop and drying source gas concurrent heating pipe connection.
Drying source gas concurrent heating pipeline is connected with the hot journey exit end of dividing wall type high temperature heater (HTH).
On the drying source gas circulation loop, be provided with fly-ash separator.
Be provided with after the main stove destructive distillation part semicoke is carried out the main stove quenching part that quenching is handled, main stove quenching part is connected with self-circulation cooling loop.
Self-circulation cooling loop comprises afterheat heat exchanger, and the hot journey entrance end of afterheat heat exchanger is connected with the self-circulation gas outlet of main stove quenching part, and the hot journey exit end of afterheat heat exchanger is connected with the self-circulation gas feed of main stove quenching part.
Between the self-circulation gas outlet of afterheat heat exchanger and main stove quenching part, be provided with fly-ash separator.
The utility model reasonable flowsheet structure, adopting by partition heating (outer hot mode heating), not diluted high temperature carbonization coal gas outside stove is thermal barrier, goes into the direct and coal charge transmission of heat by contact of gas retort, makes its pyrolysis, realizes destructive distillation.The volatility product (dry distillation gas) that coal charge is overflowed in the stove imports in the coal gas of high temperature stream (thermal barrier) and comes out of the stove in the lump, after cooling, purification, supercharging, is recycled into stove after part still is heated to 450-900 ℃ as thermal barrier by recuperative heat exchanger and uses; It is outer for using that all the other purify coal gas (real whole coal gas for coal charge effusion in the stove in the working cycle).Gaseous heat-carrier is all from dry distillation gas, and dry distillation gas is not by the tramp material gas dilution; The coal gas that destructive distillation produces is all done outer confession, and quenching and system's concurrent heating are all unreferenced.
The get both advantage of inside and outside hot type destructive distillation device of apparent the present invention, coal gas purity is suitable with external-heat technology, makes to give gas that quality is good, calorific value is high, using value is high outward, be ideal industrial chemicals or height product fuel; And dry distillation gas can supply all outward; Coal charge is subjected to temperature lower and be heated evenly, and the tar yield is higher; The system heat sources source is wide, comprises fuel flue gases such as available low-grade fine coal, coal gas; This thermal source can send the dryer section utilization again after partition heat exchange cooling, thereby the system thermal efficiency height, and power consumption economizes; Raw coal reenters destructive distillation behind the drying and dehydrating in this process system, then moisture is low in the coal gas, and waste water generates and lacks in the purification separation process, and environmental protection treatment is simple; Self-circulation cooling mode is adopted in quenching, and the waste heat of its partition heat exchange is able to abundant recycling.This technology is suitable for the multiple type of furnace, comprises present existing vertical heater, three sections stoves, rotary kiln, meshbeltfurnace, fluidizing furnace etc.; Less demanding to going into stove coal particle size (lumpiness), and be applicable to multiple coal; System flow is succinct, easy handling control in the production run, and the industrialization construction investment relatively economizes.
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is the structural representation of an embodiment of the utility model.
Fig. 2 is the structural representation of the utility model master stove when being upright furnace.
Fig. 3 is the structural representation of the utility model master stove when being rotary kiln.
Fig. 4 is the structural representation of the utility model master stove when being meshbeltfurnace.
The explanation of accompanying drawing 1-4 number in the figure:
1, feed stock for blast furnace coal; 2, semicoke finished product; 3, main stove (3-1, dryer section or drying oven; 3-2, retort section or gas retort; 3-3, quenching section or quenching stove); 4, first fly-ash separator; 5, dry recycle blower fan; 6, emptying flue gas; 7, second fly-ash separator; 8, dividing wall type afterheat heat exchanger; 9, coal gas cooling condensation and refining plant; 10, tar; 11, booster fan; 12-1, circulating gas pipeline; 12-2, the pipeline that gives gas outward; 13, dividing wall type high temperature heater (HTH); 14, the 3rd fly-ash separator; 15, afterheat heat exchanger; 16, quenching recirculation blower; 17, soft water pipeline; 18, vapour line; 19, high temperature flue gas pipeline; 20, low-temperature flue gas pipeline; 21, dry concurrent heating pipeline; 22, the air sealer that discharges of the coke.
Embodiment:
Embodiment 1:
A kind of brown coal or pyrogenous system of high volatile coal of being used for, wherein main stove 3 is by dryer section (stove) 3-1, retort section (stove) 3-2, quenching section (stove) 3-3 three parts are formed, the hot journey entrance end that coal gas is connected to dividing wall type afterheat heat exchanger 8 is drawn in the air outlet of the destructive distillation part 3-2 of main stove (being retort section or gas retort), coal gas is connected to coal gas cooling condensation and refining plant 9 by its hot journey exit end after the 8 preliminary coolings of dividing wall type afterheat heat exchanger, the purification gas exit of coal gas cooling condensation and refining plant 9 through booster fan 11 respectively with outside the give gas cold journey entrance end of pipeline 12-2 and dividing wall type afterheat heat exchanger 8 be connected, the cold journey exit end of dividing wall type afterheat heat exchanger 8 is connected to the cold journey entrance end of dividing wall type high temperature heater (HTH) 13 again, and the cold journey exit end of dividing wall type high temperature heater (HTH) 13 partly is that retort section 3-2 inlet mouth is connected with the destructive distillation of main stove.
Before dividing wall type afterheat heat exchanger 8, be provided with the coal gas of drawing from retort section 3-2 is carried out dust separating second fly-ash separator 7.
Be provided with before the main stove retort section 3-2 the withering main stove drying nest 3-1 of coal charge (being dryer section or drying oven), main stove drying nest 3-1 is connected with the drying source gas circulation loop, and the drying source gas circulation loop is connected with drying source gas concurrent heating pipeline 21 and 20.
Drying source gas concurrent heating pipeline 20 is connected with the hot journey exit end of dividing wall type high temperature heater (HTH) 13.
On the drying source gas circulation loop, be provided with first fly-ash separator 4 and recirculation blower 5 successively.
Be provided with behind the main stove retort section 3-2 semicoke is carried out the main stove quenching part 3-3 (being quenching section or quenching stove) that quenching is handled, main stove quenching section 3-3 is connected with self-circulation cooling loop.
The quenching self-circulation cooling loop comprises afterheat heat exchanger 15, the hot journey entrance end of afterheat heat exchanger 15 is connected with the self-circulation gas outlet of main stove quenching section 3-3, and the hot journey exit end of afterheat heat exchanger 15 is connected with the self-circulation gas feed of main stove quenching section 3-3.
Between the self-circulation gas outlet of afterheat heat exchanger 15 and main stove quenching section 3-3, be provided with the 3rd fly-ash separator 14, and be provided with recirculation blower 16 between the self-circulation gas feed of main stove quenching section 3-3
The working process of present embodiment is:
Raw material brown coal 1 at first enter in the drying nest 3-1 of main stove 3, with go into the hot flue gas adverse current of stove and contact, be heated to 150～300 ℃ gradually, coal is fully dehydrated after sealing gland enters in the destructive distillation part of main stove 3, with go into stove coal gas of high temperature counter current contact, continue to be heated to 400～850 ℃, make the pyrolysis of coal destructive distillation become semicoke, overflow simultaneously coal gas and tarry vapours.Hot semicoke enters in the quenching part 3-3 of main stove 3 again, contact with self-circulation cold air in the stove (coal gas or flue gas or indifferent gas) medium counter flow, semicoke is cooled to below 160 ℃ (specifically with this not spontaneous combustion of semicoke ingress of air, and being convenient to follow-up safety in transportation and storage is as the criterion), air sealer 22 draws off semicoke product 2 through the discharging of the coke;
Quenching cold air medium absorbs and to become high temperature hot gas behind the semicoke heat and draw outside the stove, whether looks its dustiness size decision through the 3rd fly-ash separator 14, reenter that afterheat heat exchanger 15 is cooled to below 150 ℃ after recirculation blower 16 again closed cycle go into stove; The steam 18 that produces elevated pressures after soft water 17 and the high temperature hot gas heat exchange supplies (conversion is outer for steam value, and ton Jiao can increase sharp about 5%) outward as heat energy.
The coal gas (containing tarry vapours) of overflowing in the destructive distillation part 3-2 imports in the coal gas of high temperature stream and is taken out of outside the stove in the lump, whether look its dustiness size decision through second fly-ash separator 7, entering coal gas cooling condensation and refining plant 9 again after the preliminary cooling of dividing wall type afterheat heat exchanger 8 separates coal gas coal-tar middle oil 10 with liquid form, dry distillation gas after the purification is after booster fan 11 boosts, a part (be equivalent to original go into stove flow) 12-1 is heated to 450～900 ℃ to dividing wall type high temperature heater (HTH) 13 as thermal barrier again and is written into destructive distillation part 3-2 as elevated temperature heat and recycles after 8 preheatings of dividing wall type afterheat heat exchanger, remaining part is equivalent to whole coal gas 12-2 that destructive distillation produces and can all is used for supplying outside the system.
500～1200 ℃ external high-temperature flue gas (19) enters dividing wall type high temperature heater (HTH) 13 heat exchange cooling back and mends in the hot flue gas flow of dry recycle as drying source gas 20, whether the circulating flue gas of coming out of the stove looks its dustiness size decision through first fly-ash separator 4, again through blower fan 5 boost, concurrent heating 21 fed to boiler circulations, the coal moisture that steams that is heated is discharged in the lump with emptying flue gas 6.
Dividing wall type high temperature heater (HTH) 13 is to be made or made by carbofrax material by stainless steel or high-temperature heat-resistance steel.Described stainless steel or high-temperature heat-resistance steel also can be handled through surface alloying.
Claims (10)
1. one kind is used for brown coal or the pyrogenous system of high volatile coal, it is characterized in that: comprise main stove, main stove contains the destructive distillation part, the coal gas that destructive distillation is partly drawn is connected to coal gas cooling condensation and refining plant, the coal gas cooling condensation is connected with the cold journey entrance end of give gas outward pipeline and dividing wall type high temperature heater (HTH) respectively with the gas exit of refining plant, and the cold journey exit end of dividing wall type high temperature heater (HTH) is connected with the destructive distillation partial-air admission mouth of main stove.
2. brown coal or the pyrogenous system of high volatile coal of being used for according to claim 1 is characterized in that: the gas exit of coal gas cooling condensation and refining plant through booster fan respectively with outside the give gas cold journey entrance end of pipeline and dividing wall type high temperature heater (HTH) be connected.
3. brown coal or the pyrogenous system of high volatile coal of being used for according to claim 1 is characterized in that: be provided with after main stove destructive distillation partly is retort section coal gas outlet coal gas is carried out dust separating fly-ash separator.
4. according to claim 1,2 or 3 described brown coal or the pyrogenous systems of high volatile coal of being used for, it is characterized in that: after main stove destructive distillation part coal gas outlet fly-ash separator, the dividing wall type afterheat heat exchanger is set, its hot journey entrance end is connected with the fly-ash separator outlet, and hot journey exit end is connected with the refining plant entrance end with the coal gas cooling condensation; Its cold journey entrance end is connected with refining plant outlet or booster fan outlet with the coal gas cooling condensation, and cold journey exit end is connected with the cold journey entrance end of dividing wall type high temperature heater (HTH).
5. according to claim 1,2 or 3 described brown coal or the pyrogenous systems of high volatile coal of being used for, it is characterized in that: be provided with the withering main stove drying nest of coal charge before the main stove destructive distillation part, main stove drying nest is connected with the drying source gas circulation loop, drying source gas circulation loop and drying source gas concurrent heating pipe connection.
6. brown coal or the pyrogenous system of high volatile coal of being used for according to claim 4 is characterized in that: drying source gas concurrent heating pipeline is connected with the hot journey exit end of dividing wall type high temperature heater (HTH).
7. brown coal or the pyrogenous system of high volatile coal of being used for according to claim 4 is characterized in that: be provided with fly-ash separator on the drying source gas circulation loop.
8. according to claim 1,2 or 3 described brown coal or the pyrogenous systems of high volatile coal of being used for, it is characterized in that: be provided with after the main stove destructive distillation part semicoke is carried out the main stove quenching part that quenching is handled, main stove quenching part is connected with self-circulation cooling loop.
9. brown coal or the pyrogenous system of high volatile coal of being used for according to claim 7, it is characterized in that: self-circulation cooling loop comprises afterheat heat exchanger, the hot journey entrance end of afterheat heat exchanger is connected with the self-circulation gas outlet of main stove quenching part, and the hot journey exit end of afterheat heat exchanger is connected with the self-circulation gas feed of main stove quenching part.
10. brown coal or the pyrogenous system of high volatile coal of being used for according to claim 9 is characterized in that: be provided with fly-ash separator between the self-circulation gas outlet of afterheat heat exchanger and main stove quenching part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010202466465U CN201756532U (en) | 2010-06-28 | 2010-06-28 | System for lignitic coal or high-volatile coal dry distillation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010202466465U CN201756532U (en) | 2010-06-28 | 2010-06-28 | System for lignitic coal or high-volatile coal dry distillation |
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| CN201756532U true CN201756532U (en) | 2011-03-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732275A (en) * | 2012-07-17 | 2012-10-17 | 苏州劲仑能源科技有限公司 | Lignite dry distillation device using fire coal hot air furnace as heat supply |
| CN102807879A (en) * | 2012-08-17 | 2012-12-05 | 济钢集团有限公司 | Coke oven gas waste heat utilization device |
-
2010
- 2010-06-28 CN CN2010202466465U patent/CN201756532U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732275A (en) * | 2012-07-17 | 2012-10-17 | 苏州劲仑能源科技有限公司 | Lignite dry distillation device using fire coal hot air furnace as heat supply |
| CN102807879A (en) * | 2012-08-17 | 2012-12-05 | 济钢集团有限公司 | Coke oven gas waste heat utilization device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110309 Termination date: 20130628 |