CN102732275A - Lignite dry distillation device using fire coal hot air furnace as heat supply - Google Patents
Lignite dry distillation device using fire coal hot air furnace as heat supply Download PDFInfo
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- CN102732275A CN102732275A CN2012102466261A CN201210246626A CN102732275A CN 102732275 A CN102732275 A CN 102732275A CN 2012102466261 A CN2012102466261 A CN 2012102466261A CN 201210246626 A CN201210246626 A CN 201210246626A CN 102732275 A CN102732275 A CN 102732275A
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Abstract
The invention relates to a lignite dry distillation device using a fire coal hot air furnace as heat supply. A high-temperature flue gas outlet of the fire coal hot air furnace is communicated with a hot flue gas inlet of a drying furnace; a low-temperature flue gas outlet of the dry furnace is connected to an inlet of a dust remover; the inlet of the dust remover is connected to an inlet of a circulating fan; an outlet of the circulating fan is connected with the hot flue gas inlet of the drying furnace; a gas inlet of a burner is connected with a hot gas outlet of a coking furnace; a high-temperature flue gas outlet of the burner is communicated to a hot flue gas inlet of a dry distillation furnace; a coarse gas outlet of the dry distillation furnace is connected to an inlet of a gas purifying and separating system; an outlet of the gas purifying and separating system is connected to an inlet of a gas booster fan; an outlet of the gas booster fan is respectively connected to a cold gas inlet of the coking furnace and a gassing unit; and a hot gas outlet of the coking furnace is connected to the gassing unit. As the high-temperature flue gas of the fire coal hot air furnace is used as a lignite drying heat source, compared with the conventional process using dry distillation gas as a drying heat source, a large amount of dry distillation gas is surplus and can be used in other ways.
Description
Technical field
The present invention relates to a kind of brown coal destructive distillation device that utilizes Coalhotairfurnace as system's heat supply.
Background technology
Coal decomposes under the secluding air condition becomes the technological process of coal gas, tar and coke destructive distillation products such as (or semicokes) to be referred to as coal carbonization technology; The difference that is heated outlet temperature by coal charge can be divided into high temperature, middle temperature or low-temperature pyrolysis; It is generally acknowledged that 500～700 ℃ are low-temperature pyrolysis; High volatile class coals such as brown coal, long-flame coal or bottle coal are applicable to low-temperature pyrolysis; Mostly the destructive distillation type of furnace that present this type of coal is selected for use is strange three sections stoves in Shandong or vertical blue charcoal side stove, and mostly its combustion heat supplying mode is the internal heat type technology of Direct Contact Heating.Internal heat type technology is directly to get into by gaseous heat-carrier (be mostly gas-fired produce high-temperature flue gas) to pass block coal seam coal supply material in the gas retort and conduct heat, this technology have conduct heat fast, efficient is high, homogeneous heating, equipment are simple, investment advantage such as province.Through internal heat type destructive distillation processing, coal is changed into gas (coal gas), liquid (tar), solid (semicoke) three kinds of products, have favorable economic benefit and social benefit.But at present in the destructive distillation complete processing of this type of coal; Required drying and carbonization thermal source all is the coal gas that produces from system's destructive distillation; Be about to dry distillation gas as low side purposes such as combustion heat supplyings, quenching or using waste heat from tail gas fail better to be reclaimed or utilize, and cause a large amount of higher-grade thermal waste.And water cut very high (between 25%-65%) in the low order coals such as brown coal; Need great amount of heat to make its drying; Although low order coals such as brown coal gas yield when destructive distillation is very high; But existing technology and device are when low order coals such as destructive distillation processing brown coal, and technology itself has consumed whole or most dry distillation gases, does not have or seldom have the outer confession of coal gas output.Existing simultaneously technology is only used lumped coal with device, and coal a large amount of in small, broken bits that in exploitation and crushing and screening process, produces or fine coal can't obtain using, and cause the waste of a large amount of precious resources, and its economic benefit is restricted simultaneously.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists, provide a kind of with the brown coal destructive distillation device of Coalhotairfurnace as heat supply.
The object of the invention is realized through following technical scheme:
With the brown coal destructive distillation device of Coalhotairfurnace as heat supply, comprise drying oven, gas retort and quenching stove, the discharge port of said drying oven is communicated with the opening for feed of gas retort; The discharge port of gas retort is communicated with the opening for feed of quenching stove; The discharge port of quenching stove is provided with the sealed discharging system, it is characterized in that: also be provided with Coalhotairfurnace, the high-temperature flue gas outlet of said Coalhotairfurnace is connected with the decontamination chamber; The high-temperature flue gas outlet of decontamination chamber connects the hot gas approach of drying oven; The low-temperature flue gas outlet of drying oven is connected to the import of fly-ash separator, and the import of fly-ash separator is connected to the import of recirculation blower, and the outlet of recirculation blower is connected to the hot gas approach of drying oven; The gas inlet of burner links to each other with the heating gas outlet of quenching stove; The high-temperature flue gas outlet of burner is communicated to the hot gas approach of gas retort; The raw gas outlet of gas retort is connected to the import of gas purification separation system; The outlet of gas purification separation system is connected to the import of coal gas booster fan, and the outlet of coal gas booster fan is connected to the cooled coal gas import of quenching stove respectively and with gas unit and decontamination chamber, the outlet of the heating gas of quenching stove is connected to gas unit and decontamination chamber.
Further, above-mentioned with the brown coal destructive distillation device of Coalhotairfurnace as heat supply, wherein, the feed end of said drying oven is provided with the crushing and screening device, and the lump coal outlet of said crushing and screening device links to each other with the opening for feed of drying oven; The coal export in small, broken bits of said crushing and screening device links to each other with the opening for feed of Coalhotairfurnace.
Further, above-mentioned with the brown coal destructive distillation device of Coalhotairfurnace as heat supply, wherein, the coal export in small, broken bits of said crushing and screening device connects coal drying installation in small, broken bits, and the discharge port of coal drying installation in small, broken bits links to each other with the opening for feed of Coalhotairfurnace.
Further, above-mentioned with the brown coal destructive distillation device of Coalhotairfurnace as heat supply, wherein, the outlet of the high-temperature flue gas of said decontamination chamber is connected to the air distribution outlet of burner.
Further, above-mentioned with the brown coal destructive distillation device of Coalhotairfurnace as heat supply, wherein, said drying oven is provided with the wet flue gas drain.
A step ground again, above-mentioned with the brown coal destructive distillation device of Coalhotairfurnace as heat supply, wherein, said sealed discharging system is the air sealer that discharges of the coke.
Substantive distinguishing features and obvious improvement that technical scheme of the present invention is outstanding are mainly reflected in:
The present invention is novel in design; The high-temperature flue gas that adopts Coalhotairfurnace is as the lump coal drying source; Low-quality coal in small, broken bits through high-temperature flue gas that Coalhotairfurnace burning produces as dry distillation of coal technology in raw coal drying even the required thermal source of destructive distillation because dry heat dissipation is far away more than the destructive distillation heat dissipation when handling low order coal such as brown coal, and gas yield is also higher relatively during low order coal destructive distillation such as brown coal; So than adopting dry distillation gas as the lump coal drying source; This technology a large amount of dry distillation gases of having more than needed out, a large amount of dry distillation gases that save are then made his usefulness in addition, and economic benefit is higher; A large amount of waste heats that dry quenching(of coke) reclaims the high temperature semicoke supply destructive distillation to use, and dry quenching(of coke) makes that sulphur content is reduced in the coal gas, the final discharging environmental protection more after coal gas uses; Technical process is succinct, and easy handling control in the production run makes all resources comprise that lump coal, coal in small, broken bits and coal gas obtain efficiently, abundant and rational Application, be rated as have novelty, the good technology of creativeness, practicality.
Description of drawings
Below in conjunction with accompanying drawing technical scheme of the present invention is described further:
Fig. 1: the structural representation of apparatus of the present invention.
Embodiment
It is a kind of with the dry distillation of coal device of Coalhotairfurnace as heat supply that the present invention provides, and utilizes high-temperature flue gas that low-quality raw coal combustion in small, broken bits produces as the required thermal source of raw coal drying even destructive distillation in the dry distillation of coal system, and save dry distillation gas as high-end use.
As shown in Figure 1; With the brown coal distillation process device of Coalhotairfurnace as heat supply, comprise drying oven 1, gas retort 2 and quenching stove 3, drying oven 1 is provided with wet flue gas drain G; The feed end of drying oven 1 is provided with crushing and screening device 4; The lump coal outlet of crushing and screening device 4 links to each other with the opening for feed of drying oven 1, and the discharge port of drying oven 1 is communicated with the opening for feed of gas retort 2, and the discharge port of gas retort 2 is communicated with the opening for feed of quenching stove 3; The discharge port of quenching stove 3 is provided with the sealed discharging system, the concrete air sealer 13 that discharges of the coke that adopts of sealed discharging system; The coal export in small, broken bits of crushing and screening device 4 links to each other with the opening for feed of coal drying installation 5 in small, broken bits, and the discharge port of coal drying installation 5 in small, broken bits links to each other with the opening for feed of Coalhotairfurnace 6; The high-temperature flue gas outlet of Coalhotairfurnace 6 is connected to the high-temperature flue gas import of decontamination chamber 7; The high-temperature flue gas outlet of decontamination chamber 7 is connected to the hot gas approach B of drying oven; The low-temperature flue gas outlet A of drying oven is connected to the import of fly-ash separator 8; The import of fly-ash separator 8 is connected to the import of recirculation blower 9, and the outlet of recirculation blower 9 is connected to the hot gas approach B of drying oven; The gas inlet of burner 12 links to each other with the heating gas outlet E of quenching stove; The high-temperature flue gas outlet of burner 12 is communicated to the hot gas approach D of gas retort; The raw gas outlet C of gas retort is connected to the import of gas purification separation system 10; The outlet of gas purification separation system 10 is connected to the import of coal gas booster fan 11; The outlet of coal gas booster fan 11 is connected to the cooled coal gas import F of quenching stove respectively and with gas unit 14 and decontamination chamber 7, the heating gas of quenching stove outlet E is connected to gas unit 14 and decontamination chamber 7.In addition, the outlet of the high-temperature flue gas of decontamination chamber 7 also is connected to the air distribution outlet of burner 12.
During the brown coal destructive distillation, brown coal drop into crushing and screening device 4 and carry out crushing and screening, and the lump coal that sieves out (for example more than the 6mm) is in the opening for feed entering drying oven 1 of lump coal outlet through drying oven 1 of crushing and screening device 4; Lump coal is at drying oven and go into stove high-temperature flue gas counter current contact; Be heated to 150～300 ℃ (150 ℃, 200 ℃, 300 ℃ of examples) gradually, coal is fully dehydrated after in the opening for feed entering gas retort 2 of the discharge port of drying oven through gas retort, coal is at gas retort 2 and go into stove high-temperature flue gas counter current contact; Continue to be heated to 400～850 ℃ (400 ℃, 600 ℃, 850 ℃ of examples); Make the coal cracking destructive distillation become semicoke, overflow simultaneously coal gas and tarry vapours, hot semicoke is in the opening for feed entering quenching stove 3 of discharge port through the quenching stove of gas retort; With the cooled coal gas counter current contact; Semicoke is cooled to below 160 ℃ (specifically with this not spontaneous combustion of semicoke ingress of air, and be convenient to follow-up safety in transportation and storage be as the criterion), and air sealer 13 draws off the semicoke product through the discharging of the coke;
The coal in small, broken bits that crushing and screening device 4 sieves out (for example below 6mm) gets into coal drying installation 5 inner dryings in small, broken bits; Dried coal in small, broken bits is sent into Coalhotairfurnace 6 burning that acts as a fuel again and is produced high-temperature flue gas; High-temperature flue gas 7 udst separations that Coalhotairfurnace 6 produces in the decontamination chamber; And in the decontamination chamber, feed the heating gas of pyrogenous purification coal gas or quenching; The heating gas of pyrogenous purification coal gas or quenching and the reaction of the remaining oxygen in the high-temperature flue gas produce the low oxygen content high-temperature flue gas; Low oxygen content high-temperature flue gas after the udst separation is sent in the drying oven 1 through the hot gas approach B of drying oven and is used as drying source; Go into stove high-temperature flue gas and coal charge contact heat-exchanging, 70～180 ℃ wet flue gas directly discharges or after dedusting, discharges through wet flue gas drain G, and the low-temperature flue gas in the drying oven gets in the fly-ash separator 8 through the import that the low-temperature flue gas outlet A of drying oven passes through fly-ash separator; Low-temperature flue gas after fly-ash separator 8 is handled is through recirculation blower 9 and high-temperature flue gas air distribution from decontamination chamber 7, and the flue gas that is modulated into proper temperature is sent in the drying oven 1 raw coal is carried out drying;
The coal gas that contain tarry vapours of overflowing in the gas retort 2 with go into the stove high-temperature flue gas and be mixed into the low heat value raw gas and get into gas purification separation system 10 through the raw gas outlet C of gas retort; 10 pairs of raw gas dedustings of gas purification separation system, cooling, oily water separation purify; Coal gas after the purification is boosted by coal gas booster fan 11; Purification coal gas part after boosting is supplied with usefulness gas unit 14; A part gets in the quenching stove 3 with behind the hot semicoke contact heat-exchanging from the cooled coal gas import F of quenching stove according to quenching control needs and becomes heating gas, and part purification coal gas is sent into decontamination chamber 7;
According to destructive distillation control needs; A part of heating gas of quenching stove 3 is sent into burner 12 through the heating gas outlet E of quenching stove and is acted as a fuel; Generate 450～900 ℃ of high-temperature flue gas with air that gets into from burner blast inlet H or oxygen-rich air burning, 450～900 ℃ high-temperature flue gas gets into gas retort 2 internal heating coal charges as the elevated temperature heat carrier through the hot gas approach D of gas retort and makes its destructive distillation; A part of heating gas of quenching stove 3 is supplied with usefulness gas unit 14 through the heating gas outlet E of quenching stove; A part of heating gas of quenching stove is sent into decontamination chamber 7 through the heating gas outlet of quenching stove.
What need explanation is; The high-temperature flue gas that Coalhotairfurnace 6 produces part after udst separation gets into the distribution plenum of burner through the air distribution outlet of burner; Go into gas retort 2 after the air distribution temperature adjustment and use, then can save or significantly reduce the consumption of dry distillation gas, make more dry distillation gas be used for high-end utilization.
Because the easy oxidized spontaneous combustion of brown coal, should be controlled at below 3～6% (for example below 3.0%, below 4.5%, below 6.0%) to oxygen level in its exsiccant high-temperature flue gas and be advisable.
The raw material brown coal go out lump coal and coal in small, broken bits through crushing and screening, and lump coal is put in the drying oven 1 is heated drying, and the dry coal of crossing is transported in the gas retort 2 and is heated destructive distillation, obtains hot semicoke, and hot semicoke cools off in quenching stove 3, quenching, output semicoke product.Coal in small, broken bits is as the fuel of Coalhotairfurnace 6, and the high-temperature flue gas that Coalhotairfurnace produces is as all or part of heating source of drying oven 1, to the lump coal drying treatment.Dry distillation gas and tar steam output crude tar oil and the clean dry distillation gas of normal temperature after purifying treatment such as dedusting, cooling and tar separation in the gas retort 2.The destructive distillation thermal source partly or entirely comes from the high-temperature flue gas that dry distillation gas produces through burner 12 burnings; Go into and draw outside the gas retort in the lump after the coal gas that produces with destructive distillation behind the gas retort mixes; After the purifying treatment such as dedusting cooling tar separation of gas purification separation system 10, obtain dry distillation gas.
The all or part of high-temperature flue gas that comes from the Coalhotairfurnace generation of heating source in the drying oven 1; In the high-temperature flue gas oxygen content be controlled in 0～9% (through air excess exponential sum in the control Coalhotairfurnace combustion chamber in high-temperature flue gas, feed an amount of destructive distillation gas consumption wherein remaining oxygen its oxygen content is controlled within the scope); High-temperature flue gas is transported to drying oven after being blended into 100～400 ℃, and with the reverse heat exchange of lump coal, lump coal is heated to 150～300 ℃; Its moisture is evaporated into water vapour; By being lowered the temperature, be discharged from the lump outside the drying oven behind the hot flue gas heat exchange with water vapour, the flue gas after the part cooling and the mixed gas of water vapour through recirculation blower 9 with from the high-temperature flue gas mixing of Coalhotairfurnace and be blended into above-mentioned 100～400 ℃ hot cigarette mediation gas; Be delivered to drying oven 1 again, so circulation.All the other flue gases and water vapour after dedusting from wet flue gas drain G emptying.
Part dry distillation gas after gas purification separation system 10 purifying treatment is transported to quenching stove 3; With the reverse heat exchange of hot semicoke, the quenching that is cooled of hot semicoke, output semicoke product; This part dry distillation gas is heated intensification after heat exchange simultaneously; The hot dry distillation gas that is heated intensification in the quenching stove 3 is transported to burner 12 and the air or the oxygen-rich air mixed firing that get into from burner blast inlet H, produces high-temperature flue gas, and high-temperature flue gas is used for the thermal source of gas retort 2.High-temperature flue gas mixes with dry distillation gas; Be transported to gas retort after being blended into 450-900 ℃ mixed gas, and from the reverse heat exchange of the moisture-free coal of drying oven, make it be heated to 450-800 ℃; Temperature or low-temperature pyrolysis in the generation produce hot semicoke, thick dry distillation gas and tar steam.Hot semicoke is transferred in the quenching stove 3.Above-mentioned mixed gas is lowered the temperature after heat exchange; And be discharged from outside the gas retort in the lump with thick dry distillation gas and tar steam; After 10 dedustings of gas purification separation system, cooling and tar separation, be transformed into dry distillation gas and crude tar oil, a part of hot dry distillation gas is transported in the burner and oxygen-rich air mixed firing.The thermal source of gas retort is the high-temperature flue gas of Coalhotairfurnace output, or the high-temperature flue gas of dry distillation gas burning back generation, or both mixing.
Because dry heat dissipation is far away more than the destructive distillation heat dissipation; A large amount of waste heats that dry quenching(of coke) reclaims the high temperature semicoke supply destructive distillation to use; The present technique scheme adopts the high-temperature flue gas of Coalhotairfurnace as the lump coal drying source, than adopting dry distillation gas as the lump coal drying source, and a large amount of dry distillation gases of then having more than needed out; The a large amount of dry distillation gases that save are then made his usefulness in addition, and economic benefit is considerable.Adopt dry quenching(of coke) to make also that sulphur content is reduced in the coal gas simultaneously, the final discharging environmental protection more after coal gas uses.Be applicable to the multiple type of furnace, comprise vertical heater, three sections stoves, rotary kiln, meshbeltfurnace, fluidized-bed, fluidizing furnace etc., and be suitable for multiple coal; Technical process is succinct, easy handling control in the production run, and the industriallization construction investment economizes.
What need understand is: the above only is a preferred implementation of the present invention; For those skilled in the art; Under the prerequisite that does not break away from the principle of the invention, can also make some improvement and retouching, these improvement and retouching also should be regarded as the protection domain of this patent.
Claims (6)
1. with the brown coal destructive distillation device of Coalhotairfurnace as heat supply, comprise drying oven, gas retort and quenching stove, the discharge port of said drying oven is communicated with the opening for feed of gas retort; The discharge port of gas retort is communicated with the opening for feed of quenching stove; The discharge port of quenching stove is provided with the sealed discharging system, it is characterized in that: also be provided with Coalhotairfurnace, the high-temperature flue gas outlet of said Coalhotairfurnace is connected with the decontamination chamber; The high-temperature flue gas outlet of decontamination chamber connects the hot gas approach of drying oven; The low-temperature flue gas outlet of drying oven is connected to the import of fly-ash separator, and the import of fly-ash separator is connected to the import of recirculation blower, and the outlet of recirculation blower is connected to the hot gas approach of drying oven; The gas inlet of burner links to each other with the heating gas outlet of quenching stove; The high-temperature flue gas outlet of burner is communicated to the hot gas approach of gas retort; The raw gas outlet of gas retort is connected to the import of gas purification separation system; The outlet of gas purification separation system is connected to the import of coal gas booster fan, and the outlet of coal gas booster fan is connected to the cooled coal gas import of quenching stove respectively and with gas unit and decontamination chamber, the outlet of the heating gas of quenching stove is connected to gas unit and decontamination chamber.
2. according to claim 1 it is characterized in that: the feed end of said drying oven is provided with the crushing and screening device with the brown coal destructive distillation device of Coalhotairfurnace as heat supply, and the lump coal outlet of said crushing and screening device links to each other with the opening for feed of drying oven; The coal export in small, broken bits of said crushing and screening device links to each other with the opening for feed of Coalhotairfurnace.
3. according to claim 2 with the brown coal destructive distillation device of Coalhotairfurnace as heat supply; It is characterized in that: the coal export in small, broken bits of said crushing and screening device connects coal drying installation in small, broken bits, and the discharge port of coal drying installation in small, broken bits links to each other with the opening for feed of Coalhotairfurnace.
4. according to claim 1 with the brown coal destructive distillation device of Coalhotairfurnace as heat supply, it is characterized in that: the high-temperature flue gas outlet of said decontamination chamber is connected to the air distribution outlet of burner.
5. according to claim 1 with the brown coal destructive distillation device of Coalhotairfurnace as heat supply, it is characterized in that: said drying oven is provided with the wet flue gas drain.
6. according to claim 1 with the brown coal destructive distillation device of Coalhotairfurnace as heat supply, it is characterized in that: said sealed discharging system is the air sealer that discharges of the coke.
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| CN103160300A (en) * | 2013-03-07 | 2013-06-19 | 华中科技大学 | Modification quality upgrading system of brown coal |
| WO2014146520A1 (en) * | 2013-03-21 | 2014-09-25 | He Jianxiang | Low-temperature dry distillation apparatus and method for oil sand, oil sludge, oil shale and biomass |
| CN104862027A (en) * | 2015-04-28 | 2015-08-26 | 袁继海 | Method and device for combined drying and carbonizing of lump coal and powdered coal |
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Application publication date: 20121017 |