CN202902776U - Pulse combusting and steam rotation combined drying system used for drying lignite - Google Patents

Pulse combusting and steam rotation combined drying system used for drying lignite Download PDF

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Publication number
CN202902776U
CN202902776U CN 201220629767 CN201220629767U CN202902776U CN 202902776 U CN202902776 U CN 202902776U CN 201220629767 CN201220629767 CN 201220629767 CN 201220629767 U CN201220629767 U CN 201220629767U CN 202902776 U CN202902776 U CN 202902776U
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China
Prior art keywords
drying
steam rotary
brown coal
split type
steam
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Expired - Lifetime
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CN 201220629767
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Chinese (zh)
Inventor
赵改菊
尹凤交
王成运
李选友
史勇春
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Tianli Energy-Saving Engineering Co Ltdof Shandong Academy Of Sciences
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Tianli Energy-Saving Engineering Co Ltdof Shandong Academy Of Sciences
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Abstract

The utility model relates to a pulse combusting and steam rotation combined drying system used for drying lignite. The pulse combusting and steam rotation combined drying system used for drying the lignite comprises a pulse combusting device, a feeding device, a circular tube split-type steam rotation drying device and a dedusting device. Due to the fact that the technology with pulse combusting and steam rotation combined drying combined is adopted for drying the lignite, drying intensity is improved, the drying time is shortened, the tail gas processing quantity is reduced, the oxygen content of a system is reduced, dust combustion and explosion hazards are avoided, safety and reliability are achieved, and bulk production is achievable.

Description

A kind of intermittent combustion and steam rotary joint drying system for drying brown coal
Technical field
The utility model relates to a kind of intermittent combustion for drying brown coal and steam rotary joint drying system, is used for brown coal drying.
Background technology
The characteristics such as brown coal have the water content height, calorific value is low, easy-weathering is broken, easy spontaneous combustion are difficult to transportation, store and sell, and the moisture that removes efficiently brown coal is one of important channel that addresses this problem.The dry technology of brown coal is a lot, mainly contains the direct contact drying of hot flue gas, oil drying, hot water drying, saturated vapor contact drying etc.The direct contact drying technology of hot flue gas is comparatively ripe at present a kind of brown coal drying technology, drum-type drying, pneumatic drier and chain-plate type drying machine etc. that domestic 90% brown coal drying process using coal-fired flue-gas directly contacts, its technique is simple, easy to operate, treating capacity large, be easy to industrialization, but because the high-volatile content of brown coal and the characteristic of low ignition point, there is great potential safety hazard, high-temperature flue gas technique is difficult to process temperature and the oxygen content of control system, very easily causes burning, the blast of coal dust.Oil drying and hot water drying technology still are in experimental stage at present, and technique is still immature.And steam contact drying employing low-pressure saturated steam is drying medium, removes moisture by tube wall heat transfer indirect brown coal, and it is little that it takes the humid gas flow, and drying machine internal solvent concentration is high, is beneficial to inflammable, the explosive problem in the dry materials processes such as solving brown coal.This technology has the advantages such as safety, low, the convenient recovery condensed water of pollution, but for the convection drying technology, its equipment investment is high, heat and mass efficient is relatively low.
The utility model joins together intermittent combustion drying and steam rotary drying for drying brown coal, pulsating combusting device provides high-temperature oscillation pulse pneumatic and sound wave energy to come augmentation of heat transfer as the drying medium generator, can effectively shorten drying time, raising capacity usage ratio, the reduction equipment investment of whole dry run, further optimize the drying effect of brown coal system.
The utility model content
The purpose of this utility model provides the intermittent combustion and the steam rotary joint drying system that are used for drying brown coal of a kind of drying time of short, energy-efficient, safety and environmental protection, for the drying of brown coal.
For achieving the above object, the utility model adopts following technical scheme.
A kind of intermittent combustion and steam rotary joint drying system for drying brown coal comprise: pulsating combusting device, charging gear, the split type steam rotary dryer of endless tube, dust arrester; Wherein the pulsating combusting device tail pipe is connected with the split type steam rotary dryer air inlet of endless tube, and the split type steam rotary dryer charging aperture of endless tube links to each other with charging gear; The split type steam rotary dryer air outlet of endless tube is connected with dust arrester; The split type steam rotary dryer discharging opening of endless tube is connected with the siccative storehouse with the dust arrester discharging opening and is connected.
The steam inlet of the split type steam rotary dryer built-in heat exchanger of described endless tube is connected with steam source.
The condensation-water drain of the split type steam rotary dryer built-in heat exchanger of described endless tube can be connected with boiler.
Described intermittent combustion and steam rotary joint drying system for drying brown coal also comprises circulating fan, and circulating fan connects the split type steam rotary dryer air inlet of outlet, pulsating combusting device and endless tube of dust arrester.
Described charging gear comprises feed bin, screw conveyer, the discharge valve that connects successively; Brown coal enter the split type steam rotary dryer of endless tube through feed bin, screw conveyer, discharge valve successively.
Described pulse combustion device is Helmholtz type pulsating combusting device, and its tail pipe is connected with the split type steam rotary dryer of endless tube.
The split type steam rotary dryer of described endless tube is included in 3~9 ring shape heating tubes of arranging in concentrically ringed mode on the cross-wise direction in the cylindrical shell, is being arranged with the some groups of circular heating tubes that are parallel to each other along the cylindrical shell length direction; Each circle heat exchanger tube is divided into 3~5 parts in the cylindrical shell cross-sectional direction, every part by two through the straight tube that is parallel to each other of cylindrical shell total length be connected between two straight tubes some endless tubes parallel to each other and form, each indoor lateral of straight tube and steam distribution links together by flexible pipe, and endless tube is parallel being welded between two straight tubes then; Every group of heat exchanger tube supports by the pipe holder that is welded on the barrel, and Position Design corresponding with the straight tube of every group of heat exchanger tube on the pipe holder becomes semicircular groove, and straight tube is placed directly in the groove.
Described dust arrester is two-stage dust removal, and the first order is cyclone dust collectors, and the second level is sack cleaner; Tail gas after the dedusting mixes with the pulsating combusting device tail gas stream through a circulating fan part sends the split type steam rotary dryer of endless tube back to, and a part is as the Secondary Air retrieval system of pulsating combusting device, and another part is emptying.
The utility model adopts intermittent combustion mode dry and that the steam rotary drying combines that brown coal are carried out drying, the required most of heat of brown coal drying is to be provided by the high steam source of heat exchange efficiency, pulsating combusting device tail gas operating gas velocity is low, the corresponding load that reduces dust pelletizing system, tail gas after the dedusting mixes the oxygen content that has reduced system with the pulsating combusting device tail gas stream again, without dust combustion and explosion danger, safe and reliable.
High-temperature tail gas stream and sound wave energy with hard oscillation characteristic that pulsating combusting device produces.Under the effect in hard oscillation flow field, the thickness of the speed between brown coal surface and flue gas, temperature and hygroscopic water concentration boundary layer all reduces greatly, thereby has strengthened heat and mass transfer process between wet brown coal and the air-flow; Sound wave energy can destroy the internal structure of brown coal particle, make internal junction Heshui minimizing in the brown coal particle, the Free water component increases, accelerate brown coal dehydration and dewatering efficiency, be aided with again high temperature (gas flow temperature is generally between 500~700 ℃), can be with brown coal drying to moisture content below 15~30% within the extremely short time, the temperature of brown coal generally all is no more than 50 ℃.
The steam source of the split type steam rotary dryer heating pipe built-in of endless tube provides heat to remove the interior residual moisture of brown coal, and the condensation heat transfer of steam improves greatly than traditional flue gas heat exchange efficient; Condensed water all returns the boiler recycling.
Adopt present technique to carry out brown coal drying, can improve the thermal efficiency, shorten drying time, reduce the oxygen content of system, reduce the treating capacity of tail gas, without dust combustion and explosion danger, safe and reliable, can realize large-scale production.
The beneficial effects of the utility model are:
(1) efficient energy-saving.The utility model adopts intermittent combustion mode dry and that the steam rotary drying combines that brown coal are carried out drying, utilize hard oscillation characteristic and the sound wave energy of the tail gas stream of intermittent combustion generation to strengthen brown coal drying, improve the drying efficiency of brown coal, and then reduced energy consumption, shortened drying time; The vapour condensation heat transfer of the split type steam rotary dryer heat exchanger of endless tube is higher than traditional hot flue gas heat exchange efficient, and the condensed water that generates behind the steam heat-exchanging all returns the boiler recycling; Tail gas after most of dedusting is the retrieval system UTILIZATION OF VESIDUAL HEAT IN also.
(2) tail gas and dust treating capacity are little, and environmental protection pressure is low.Dry required most of heat is to be provided by the high steam source of heat exchange efficiency, and pulsating combusting device tail gas operating gas velocity is low, can effectively reduce the treating capacity of tail gas and dust, and environmental protection pressure is low.
(3) security of system is reliable.The mode that adopts convection drying and contact drying to combine is carried out drying to brown coal, and convection drying stage flue gas oxygen content is low, the brown coal heat treatment time short and the brown coal temperature is lower, and system is without burning and explosion danger, and is safe and reliable.
Description of drawings
Fig. 1 is the process chart of the utility model specific embodiment.
Wherein, 1. feed bin, 2. conveying worm, 3. discharge valve, 4. pulsating combusting device, the 5. split type steam rotary dryer of endless tube, 6. cyclone dust collectors, 7. sack cleaner, 8. circulating fan, 9. siccative storehouse.
The specific embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and embodiment.
Among Fig. 1, a kind of intermittent combustion and steam rotary joint drying system for drying brown coal, pulsating combusting device 4 offgas duct are connected with split type steam rotary dryer 5 air inlets of endless tube, and split type steam rotary dryer 5 charging apertures of endless tube link to each other with discharge valve 3; The steam inlet of split type steam rotary dryer 5 built-in heat exchangers of endless tube is connected with steam source, and the condensation-water drain of split type steam rotary dryer 5 built-in heat exchangers of endless tube is connected with boiler; Split type steam rotary dryer 5 air outlets of endless tube link to each other successively with cyclone dust collectors 6, sack cleaner 7, and split type steam rotary dryer 5 discharging openings of endless tube are connected discharging opening and are connected with siccative storehouse 9 respectively with cyclone dust collectors.Tail gas after the dedusting mixes with pulsating combusting device 4 tail gas stream through circulating fan 8 parts sends the split type steam rotary dryer 5 of endless tube back to, and a part is as the Secondary Air retrieval system of pulsating combusting device 4, and surplus is emptying.
Feed bin 1, conveying worm 2, discharge valve 3 connect successively, and material enters the split type steam rotary dryer 5 of endless tube through feed bin 1, conveying worm 2, discharge valve 3.
The split type steam rotary dryer 5 of described endless tube is included in 3~9 ring shape heating tubes of arranging in concentrically ringed mode on the cross-wise direction in the cylindrical shell, is being arranged with the some groups of circular heating tubes that are parallel to each other along the cylindrical shell length direction; Each circle heat exchanger tube is divided into 3~5 parts in the cylindrical shell cross-sectional direction, every part by two through the straight tube that is parallel to each other of cylindrical shell total length be connected between two straight tubes some endless tubes parallel to each other and form, each indoor lateral of straight tube and steam distribution links together by flexible pipe, and endless tube is parallel being welded between two straight tubes then; Every group of heat exchanger tube supports by the pipe holder that is welded on the barrel, and Position Design corresponding with the straight tube of every group of heat exchanger tube on the pipe holder becomes semicircular groove, and straight tube is placed directly in the groove.
Although above-mentionedly by reference to the accompanying drawings the specific embodiment of the present utility model is described; but be not the restriction to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection domain of the present utility model.

Claims (9)

1. intermittent combustion and steam rotary joint drying system that is used for drying brown coal, it is characterized in that, comprise pulsating combusting device, charging gear, the split type steam rotary dryer of endless tube, dust arrester and circulating fan, wherein the pulsating combusting device tail pipe is connected with the split type steam rotary dryer air inlet of endless tube, and the split type steam rotary dryer charging aperture of endless tube links to each other with charging gear; The split type steam rotary dryer air outlet of endless tube is connected with dust arrester; The steam inlet of the split type steam rotary dryer built-in heat exchanger of endless tube is connected with steam source; The split type steam rotary dryer discharging opening of endless tube is connected with the siccative storehouse with the dust arrester discharging opening and is connected.
2. intermittent combustion and steam rotary joint drying system for drying brown coal as claimed in claim 1 is characterized in that the steam inlet of the split type steam rotary dryer built-in heat exchanger of endless tube is connected with steam source.
3. intermittent combustion and steam rotary joint drying system for drying brown coal as claimed in claim 1 is characterized in that the condensation-water drain of the split type steam rotary dryer built-in heat exchanger of endless tube is connected with boiler.
4. intermittent combustion and steam rotary joint drying system for drying brown coal as claimed in claim 1, it is characterized in that, also comprise circulating fan, circulating fan connects the split type steam rotary dryer air inlet of outlet, pulsating combusting device and endless tube of dust arrester.
5. intermittent combustion and steam rotary joint drying system for drying brown coal as claimed in claim 1 is characterized in that, described charging gear comprises feed bin, screw conveyer, the discharge valve that connects successively.
6. intermittent combustion and steam rotary joint drying system for drying brown coal as claimed in claim 1, it is characterized in that, the split type steam rotary dryer of described endless tube, be included in 3~9 ring shape heating tubes of arranging in concentrically ringed mode on the cross-wise direction in the cylindrical shell, be arranged with the some groups of circular heating tubes that are parallel to each other along the cylindrical shell length direction; Each circle heat exchanger tube is divided into 3~5 parts in the cylindrical shell cross-sectional direction, every part by two through the straight tube that is parallel to each other of cylindrical shell total length be connected between two straight tubes some endless tubes parallel to each other and form, each indoor lateral of straight tube and steam distribution links together by flexible pipe, and endless tube is parallel being welded between two straight tubes then; Every group of heat exchanger tube supports by the pipe holder that is welded on the barrel, and Position Design corresponding with the straight tube of every group of heat exchanger tube on the pipe holder becomes semicircular groove, and straight tube is placed directly in the groove.
7. intermittent combustion and steam rotary joint drying system for drying brown coal as claimed in claim 1 is characterized in that, described pulse combustion device is Helmholtz type pulsating combusting device.
8. intermittent combustion and steam rotary joint drying system for drying brown coal as claimed in claim 1 is characterized in that described dust arrester is two-stage dust removal, and the first order is cyclone dust collectors, and the second level is sack cleaner.
9. intermittent combustion and steam rotary joint drying system for drying brown coal as claimed in claim 1 is characterized in that the gas flow temperature in the described pulsating combusting device is between 500~700 ℃.
CN 201220629767 2012-11-26 2012-11-26 Pulse combusting and steam rotation combined drying system used for drying lignite Expired - Lifetime CN202902776U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220629767 CN202902776U (en) 2012-11-26 2012-11-26 Pulse combusting and steam rotation combined drying system used for drying lignite

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Application Number Priority Date Filing Date Title
CN 201220629767 CN202902776U (en) 2012-11-26 2012-11-26 Pulse combusting and steam rotation combined drying system used for drying lignite

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103542707A (en) * 2013-11-18 2014-01-29 湖南飞来峰非金属矿物材料有限公司 Fluidized bed combustion boiler waste-heat utilization system of external heated rotary dryer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103542707A (en) * 2013-11-18 2014-01-29 湖南飞来峰非金属矿物材料有限公司 Fluidized bed combustion boiler waste-heat utilization system of external heated rotary dryer

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Granted publication date: 20130424