CN101776371B - Superheated steam rotary drying and steam tail gas indirect rotary drying method for lignite - Google Patents
Superheated steam rotary drying and steam tail gas indirect rotary drying method for lignite Download PDFInfo
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- CN101776371B CN101776371B CN2010100463128A CN201010046312A CN101776371B CN 101776371 B CN101776371 B CN 101776371B CN 2010100463128 A CN2010100463128 A CN 2010100463128A CN 201010046312 A CN201010046312 A CN 201010046312A CN 101776371 B CN101776371 B CN 101776371B
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Abstract
The invention relates to a superheated steam rotary drying and steam tail gas indirect rotary drying method for lignite, which uses steam generated during drying lignite as a drying medium. Superheated steam from a cyclone separator is divided into two paths; one path enters an indirect rotary cylindrical dryer, fully utilizes condensation heat of the steam generated during drying and minimizes the drying energy consumption; and the other path enters a direct rotary cylindrical dryer, is heated indirectly by the steam generated during drying lignite and then directly contact the lignite for drying. In the invention, steam evaporated by lignite per se is utilized for superheated recycling, thereby saving energy; in addition, a drying system is closed without oxygen, thereby being safe and environment friendly, and eliminating the accident potential of inflammable and explosive property of lignite.
Description
Technical field
The present invention relates to the brown coal drying technical field, is the two-stage combination drying technology of brown coal, is characterized in utilizing brown coal drying self vapor evaporated to carry out the two-stage drying, and the heat recycle belongs to energy-conservation, safety, Environmentally-sound technology.
The characteristic of brown coal
(1) brown coal are high-moisture coals, even the moisture of some stratum coal after such coal has only drying and upgrading, just can reach the high usage of brown coal up to 85%.
(2) brown coal are inflammable coals, deposit spontaneous combustion in the process, and the dust that is evaporated with steam in the dry run possibly blast, so dry run need be carried out under the operating mode of airtight and anoxic.
Summary of the invention
Be the problem that the dust that is evaporated with steam in factory's solution brown coal moisture content height and the dry run is prone to blast, the object of the present invention is to provide a kind of method of superheated steam rotary drying and the indirect rotary drying of steam tail gas of brown coal.This method utilizes the steam of brown coal drying generation as drying medium, adopts two-stage dry, and wherein: one-level steam pipe rotary drying has made full use of the condensation heat of dry generation steam, has reduced energy consumption for drying to greatest extent; Secondary is to utilize the direct-type revolving drum drier, adopts after the steam indirect that brown coal drying produces directly to contact with brown coal and carries out drying.
The objective of the invention is to realize through following technical measures:
A kind of superheated steam rotary drying of brown coal and the method for the indirect rotary drying of steam tail gas; Its step is that wet brown coal get in the sealed measuring belt conveyer from adding feed bin; The metering back gets in the indirect type revolving drum drier, and simultaneously, the superheated steam that Self-duster comes out is divided into two-way:
A. one the tunnel get into the indirect type revolving drum drier, superheated steam carries out drying to wet brown coal, reaches in the discharge end pipeline entering direct-type revolving drum drier of the dry brown coal that require of one-level by the indirect type revolving drum drier; Be evaporated in the brown coal by the indirect type revolving drum drier in the wet part of entering deduster; Uncooled vapour and fixed gas get into out steam chest in the heating tube of indirect type revolving drum drier; And from going out steam chest upper pipe entering vapour-liquid scrubbing tower; With from vapour-liquid wash tower bottoms and contacting through the washings after the supercharging of washings circulating pump, uncooled vapour and fixed gas are washed, under the effect of air-introduced machine, drain into atmosphere after the cooling, dedusting; Condensed water is discharged through air chamber and the steam trap that goes out the steam chest bottom in the indirect type revolving drum drier heating tube;
B. another passes by vapours after the air-introduced machine supercharging gets into overheated steam heating apparatus and high-temperature flue gas indirect heat exchange; Get in the direct-type revolving drum drier; With the brown coal direct inverse that gets into drying machine simultaneously to contacting; Brown coal are carried out drying, and the brown coal that reach the secondary drying requirement drain in the dried brown coal product storehouse and through rotary discharger from the discharge end of direct-type revolving drum drier and are expelled to next procedure; Wet part that the brown coal of direct-type revolving drum drier are evaporated is mixed the back with the superheated steam after the cooling and gets in the discharge end of indirect type revolving drum drier through the connection pipeline between indirect type revolving drum drier and the direct-type revolving drum drier; After the wet part that is evaporated with the brown coal of indirect type revolving drum drier is converged; In the entering deduster; Behind the tails dedusting that converges; Collected brown coal powder gets into the connection pipeline between indirect type revolving drum drier and the direct-type revolving drum drier through rotary discharger, and gets into secondary drying with the dry intact brown coal of one-level.
Advantage of the present invention:
(1) heat recycle and recovery
(1) Btu utilization explanation
It is that 600～700 ℃ superheated steam is directly with the brown coal Contact Evaporating and take away the wet part in the brown coal that the direct-type revolving drum drier of secondary drying of the present invention adopts temperature; Make in wet part of the superheated steam with steam state form entering cooling; Superheat steam temperature behind the secondary drying >=105 ℃ get in the indirect type revolving drum drier and take away wet part that is evaporated in the brown coal in the indirect type revolving drum drier simultaneously through pipeline, superheated steam temperature >=105 this moment ℃; Be divided into two the tunnel from separator; For the temperature that gets into the indirect type revolving drum drier is >=105 ℃ superheated steam, if directly utilize the dry brown coal of sensible heat, the thermal efficiency is not high; Therefore; For utilizing temperature is >=105 ℃ superheated steam latent heat; Adopting drying equipment is the Pipe bundle structure of indirect type revolving drum drier, through a large amount of condensation latent heat contact drying brown coal that superheated steam in restraining is emitted, has effectively utilized >=heat of 105 ℃ superheated steam; For the superheated steam that gets into the direct-type revolving drum drier; Utilize the heat exchange of indirect shell and tube hot-blast stove; Make >=105 ℃ superheated steam directly is superheated to 600～700 ℃ of temperature, gets into again in the direct-type revolving drum drier directly to contact and dry brown coal with brown coal.The dry of indirect type revolving drum drier and direct-type revolving drum drier all adopts superheated steam, and superheated steam forms the superheated steam cyclic drying system of sealing all from brown coal self vapor evaporated.More traditional direct-type revolving drum drier, behind the brown coal drying temperature be 160～180 ℃ cryogenic overheating steam not do not utilize but directly discharging obtain reclaiming.
(2) the used superheated steam of the dry indirect type revolving drum drier of one-level is from the overheated fugitive constituent that converges of indirect type revolving drum drier and direct-type revolving drum drier; It is the utilization of hyperthermia and superheating fugitive constituent vapor recycle; Hyperthermia and superheating fugitive constituent vapor recycle utilization rate can reach 70～95%; And the recycle of hyperthermia and superheating fugitive constituent steam has reduced the introducing of extra steam, has improved the thermal efficiency of system.
(3) the used superheated steam of the direct-type revolving drum drier of secondary drying is also from the overheated fugitive constituent that converges of indirect type revolving drum drier and direct-type revolving drum drier; Be to the overheated recycle of the secondary of overheated fugitive constituent; Reduce replenishing of external heat, saved the energy.
(2) the drying medium consumption is few, and system power dissipation is low
Superheated steam specific heat is 2 times of air specific heat, compares as drying medium with adopting air, and required drying medium (superheated steam) consumption is few, and therefore, drying medium circulation required drive (circulating fan) energy consumption reduces.
(3) airtight, the no oxygen of system, safety and environmental protection
(1) the present invention proposes the two-stage Aassociation drying of the superheated steam recycle of brown coal; The measuring belt of sealing is adopted in charging; The sealing of material envelope is adopted in discharging, and whole system is carried out under the operating mode of airtight, anaerobic, superheated steam recycle, has eliminated inflammable, the explosive accident potential of brown coal.
The tail gas of (2) discharging from the dry indirect type revolving drum drier of one-level is superheated steam and a spot of fixed gas of low temperature; In the vapour-liquid scrubbing tower, wash, in the cooling, dust removal process process; A large amount of superheated steams are condensed into water; Can not produce a large amount of tail gas, and the tail gas that produces is a spot of steam and fixed gas, the discharging environmentally safe.
Description of drawings
Fig. 1 is a process chart of the present invention.
The specific embodiment
As shown in Figure 1; A kind of superheated steam rotary drying of brown coal and the method for the indirect rotary drying of steam tail gas; Its step is that the wet brown coal that needs are dry add in the sealed measuring belt conveyer 2 of feed bin 1 entering from wet brown coal; When the metering back got in the indirect type revolving drum drier 3, the superheated steam that Self-duster 10 comes out was divided into two-way:
A. one the tunnel get into one-level indirect type revolving drum drier 3.The superheated steam air chamber of entering indirect type revolving drum drier 3 and uniform distribution are to heating tube; Carry out drying through tube wall in the face of wet brown coal; Rotation along with indirect type revolving drum drier 3; Reach the dry brown coal that require of one-level, by the condensation latent heat of the generation water vapour of indirect type revolving drum drier 3; Directly get in the direct-type revolving drum drier 7 along the discharge end pipeline; In the brown coal of indirect type revolving drum drier 3, be evaporated in the wet part of entering deduster 10; Uncooled vapour and fixed gas get into out steam chest in the heating tube of indirect type revolving drum drier 3; And from going out steam chest upper pipe entering vapour-liquid scrubbing tower 4; With from vapour-liquid scrubbing tower 4 bottoms and contacting through the washings after 5 superchargings of washings circulating pump; After uncooled vapour and fixed gas are washed, cooling, dedusting reach the environment protection emission requirement, under the effect of air-introduced machine 6, drain into atmosphere; And condensed water is discharged through air chamber and the steam trap that goes out the steam chest bottom in indirect type revolving drum drier 3 heating tubes;
B. another passes by vapours after air-introduced machine 12 superchargings get into indirect shell and tube hot-blast stove 13 and high-temperature flue gas indirect heat exchange, gets in the secondary direct-type revolving drum drier 7.After secondary direct-type revolving drum drier 7 adopts the steam indirect that brown coal dryings produce, with the brown coal direct inverse that gets into drying machine 7 simultaneously to contacting, to brown coal directly contact carry out drying.Along with the rotation of direct-type revolving drum drier 7, the brown coal that reach secondary drying drain in the dried brown coal product storehouse 8 and through rotary discharger 9 from the discharge end of direct-type revolving drum drier 7 and are expelled to next procedure; Wet part that is evaporated from the brown coal of direct-type revolving drum drier 7 is mixed the back with the superheated steam after the cooling and gets in the discharge end of indirect type revolving drum drier 3 through the connection pipeline between indirect type revolving drum drier 3 and the direct-type revolving drum drier 7; After the wet part that is evaporated with the brown coal of indirect type revolving drum drier 3 is converged; Get in the deduster 10; Behind the tails dedusting that converges; The connection pipeline that collected brown coal powder gets between indirect type revolving drum drier 3 and the direct-type revolving drum drier 7 through rotary discharger 11; And, form the superheated steam cyclic drying system of sealing with the dry intact brown coal entering of one-level secondary drying.
Above-mentioned used thermal source is: one-level steam pipe rotary drying has made full use of the condensation latent heat of dry generation water vapour; Secondary drying adopts drying medium and the direct contact-type revolving drum drying of material, and drying medium is the steam of dry run evaporation and the superheated steam that the heating of indirect-type hot air apparatus produces.
Overheated steam heating apparatus 13 can be independent indirect shell and tube hot-blast stove, and the hot type hot-blast stove also can be the superheater of boilers heated electrically.
Claims (2)
1. the method for the superheated steam rotary drying of brown coal and the indirect rotary drying of steam tail gas; Its step is that wet brown coal get in the sealed measuring belt conveyer (2) from adding feed bin (1); When the metering back got in the indirect type revolving drum ten dry machines (3), the superheated steam that deduster (10) comes out was divided into two-way:
A. one the tunnel get into indirect type revolving drum drier (3); Superheated steam carries out drying to wet brown coal; Reach in the discharge end pipeline entering direct-type revolving drum drier (7) of the dry brown coal that require of one-level by indirect type revolving drum drier (3): in the wet part of entering deduster (10) that be evaporated in the brown coal by indirect type revolving drum drier (3): uncooled vapour and fixed gas get into out steam chest in the heating tube of indirect type revolving drum drier (3); And from going out steam chest upper pipe entering vapour-liquid scrubbing tower (4); With vapour-liquid scrubbing tower (4) bottom and contact through the washings after washings circulating pump (5) supercharging, uncooled vapour and fixed gas are washed, cooling, dedusting drain into atmosphere in the effect two of air-introduced machine (6): condensed water is through air chamber and the steam trap discharge that goes out the steam chest bottom in indirect type revolving drum drier (3) heating tube;
B. another passes by vapours after air-introduced machine (12) supercharging gets into overheated steam heating apparatus (13) and high-temperature flue gas indirect heat exchange; Get in the direct-type revolving drum drier (7); Brown coal are carried out drying, and the brown coal that reach the secondary drying requirement drain in the dried brown coal product storehouse (8) and through rotary discharger (9) from the discharge end of direct-type revolving drum drier (7) and are expelled to next procedure; Wet part that the brown coal of self-joining type revolving drum drier (7) are evaporated is mixed the back with the superheated steam after the cooling and gets in the discharge end of indirect type revolving drum drier (3) through the connection pipeline between indirect type revolving drum drier (3) and the direct-type revolving drum drier (7); After the wet part that is evaporated with the brown coal of indirect type revolving drum drier (3) is converged; Get in the deduster (10); Behind the tails dedusting that converges; Collected brown coal powder gets into the connection pipeline between indirect type revolving drum drier (3) and the direct-type revolving drum drier (7) through rotary discharger (11), and gets into secondary drying with the dry intact brown coal of one-level.
2. the method for the superheated steam rotary drying of a kind of brown coal as claimed in claim 1 and the indirect rotary drying of steam tail gas is characterized in that overheated steam heating apparatus (13) is independent indirect shell and tube hot-blast stove, or the superheater be jealous of of electric food warmer.
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| CN2010100463128A CN101776371B (en) | 2010-01-06 | 2010-01-06 | Superheated steam rotary drying and steam tail gas indirect rotary drying method for lignite |
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| CN102183133A (en) * | 2011-03-18 | 2011-09-14 | 中国石油化工股份有限公司 | Brown coal transporting process |
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