CN105202761B - The spiral heat dissipation finned heat pipe group device of indirect chain-arranged type straw hot blast heater - Google Patents

The spiral heat dissipation finned heat pipe group device of indirect chain-arranged type straw hot blast heater Download PDF

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CN105202761B
CN105202761B CN201510647333.8A CN201510647333A CN105202761B CN 105202761 B CN105202761 B CN 105202761B CN 201510647333 A CN201510647333 A CN 201510647333A CN 105202761 B CN105202761 B CN 105202761B
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flue
heat
heat dissipation
pipe group
splitter cavity
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CN105202761A (en
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顾靖峰
王钰
李建南
郑洁
吴敏
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Wuxi Huishan District Agricultural Mechanization Technology Extension Service Center
WUXI JIUCHUAN MACHINERY EQUIPMENT CO Ltd
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Wuxi Huishan District Agricultural Mechanization Technology Extension Service Center
WUXI JIUCHUAN MACHINERY EQUIPMENT CO Ltd
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Abstract

The present invention relates to a kind of spiral heat dissipation finned heat pipe group devices of indirect chain-arranged type straw hot blast heater, belong to the corollary apparatus for the straw hot blast heater for carrying out heat transfer that burns using stalk fuel, for the conduction heat that indirectly exchanges heat, clean heated-air drying medium can be provided for existing drying equipment.Including splitter cavity and flue fan interface under splitter cavity, flue on spiral heat dissipation fin heat exchange pipe group, flue;Spiral heat dissipation fin heat exchange pipe group is mounted on burner hearth rear portion, has spiral heat dissipation fin in heat exchanger tube outside weldings;The upper and lower splitter cavity of flue is provided with multiple portions, is arranged along its length between each portion, using spiral heat dissipation fin heat exchange pipe group cascade;The flue gas transition passage that splitter cavity first changes portion with upper furnace is installed on flue is connected, splitter cavity is connected by one group of spiral heat dissipation fin heat exchange pipe group with splitter cavity under flue respectively on flue, and splitter cavity is connected by another group of spiral heat dissipation fin heat exchange pipe group with the heat exchanging part of splitter cavity on flue under flue.

Description

The spiral heat dissipation finned heat pipe group device of indirect chain-arranged type straw hot blast heater
Technical field
The present invention relates to a kind of spiral heat dissipation finned heat pipe group devices of indirect chain-arranged type straw hot blast heater, belong to A kind of corollary apparatus for the straw hot blast heater for carrying out heat transfer that burnt using stalk fuel, is particularly used for indirectly exchanging heat Heat is conducted, clean heated-air drying medium can be provided for existing drying equipment, grain, seed and agricultural and sideline product are done It is dry, it can heat to greenhouse in efficient facility agricultural, or industrial material provides heat source etc..
Background technology
Largely there is the thermal efficiency is low, smoke abatement and dust control is poor, the degree of automation is low etc. in various straw hot blast heaters used at present Defect.It is that straw hot blast heater is ideal not to the utmost in heat exchange structure, flow velocity, flow direction etc. design first, the generally existing thermal efficiency Low only 70% or so, heat exchange is burnt the problems such as also insufficient, causes energy consumption loss big, waste of energy is more serious;Followed by people Work feeding, it is not easy to grasp, feeding labor intensity of slagging tap it is big;Third, smog pollution is affected, and the easy slagging of heat exchanger tube, stationary furnace Phenomena such as easy coking of row, stove fire shakiness easy burn-out fire grate, lead to problems such as lifetime of hot-air stove shorter.It affects to a certain extent Straw hot blast heater is further applied and is developed.Furthermore existing hot-blast stove heat pipe arrangement form substantially has parallel arrangement, snakelike cloth Set, but its heat pipe is mostly above burner hearth, and heat pipe is densely distributed, space is relatively small, cold wind flow through heat pipe flow it is short, when Between less, heat exchange it is insufficient, and heat pipe is closer apart from exhaust outlet, and heat energy loss is big.Currently, most of hot-blast stove air duct arrangement Form is inversely matched with heat pipe arrangement form, and is inversely entered from flue duct heat pipe near exit, and the flue of centralized arrangement is passed through Heat pipe outer wall, then the outlet air nearby on the outside of flue duct heat pipe import or burner hearth, complete heat exchanging process.Also binary channels inversely enters the wind Or have staggeredly partition board among air duct, make hot air duct is opposite to lengthen, but in general, hot air duct is substantially transverse crossing Flue duct heat pipe, flow is short when hot wind flows through heat pipe, and hot wind is few by the flue duct heat pipe outer wall time, and heat exchange is insufficient, flue heat Pipe energy loss is big, and flue outlet wind, without mechanism is utilized again, so generally existing consumes energy, high, the thermal efficiency is low, waste of energy Serious problem.In addition, also having the heat exchanger for being classified snakelike heat pipe structure and reverse compound hot wind air channel structure design, stream Taoist priest, heat(It is empty)Gas and each roads Zou Qi of flue gas, reverse heat-exchange, temperature automatically controlled novel high-efficiency and energy-saving atmospheric hot air furnace, it is main suitable The multi fuels energy such as coal, timber is answered, although the thermal efficiency can be improved to 75% or more, but heating load is smaller, and structure is more complex, Cost is again high, and the degree of automation is low.Therefore, according to China's national situation, the hot wind efficiency of furnace, the degree of automation is improved and reduces biomass Burning environmental pollution is the effective ways of Developing Biomass combustion technology.It is necessary to existing indirect straw hot blast heater into Row design studies are developed.A kind of novel indirect heat exchange chain-arranged type straw hot blast heater is sent out by design studies experiment opening, specially Adapting to the biomass fuels such as stalk particle, the fast fuel of pressure, straw coal can also use coal as fuel.To with low price fuel(At Type stalk)Or gradually replace the hot-blast stove of diesel oil or coal.
Invention content
In place of against the above deficiency, a kind of spiral heat dissipation of indirect chain-arranged type straw hot blast heater is provided Finned heat pipe group device is the corollary apparatus of indirect chain-arranged type straw hot blast heater.
The hot-blast stove of the spiral heat dissipation finned heat pipe group matched with devices of the indirect chain-arranged type straw hot blast heater of the present invention is main Firing biomass fuel, currently, the biomass fuel produced in the market has stalk granular fuel, stalk to press fast fuel and stalk Coal etc., can also burn coal in actual use.It is the new and effective heat transmission equipment that heat exchange is carried out using air as medium, Constant temperature, constant pressure, dustless clean hot-air can be continuously provided.Only a small amount of powdered ash content is remaining after granular fuel completely burned Object is easily processed, pollution-free.
The stove operation of the spiral heat dissipation finned heat pipe group matched with devices of the indirect chain-arranged type straw hot blast heater of the present invention Simply, mechanical feeding, automatic chain are sent into material, temperature automatically controlled, safe, easy maintenance, and operating cost is than coal-fired, fuel oil equipment It is greatly lowered, hot-blast stove reduces thermal loss using integral heat insulation, more improves Thermal Efficiency of Hot Blast Stoves, hot-blast stove is integrally tied Structure is compact, small, noiseless, and without erection chimney stalk, simple installation, failure rate is extremely low.Meanwhile feed system use at Ripe anti-back-fire device, can effectively prevent being tempered, ensure the safety of user and the normal operation of hot-blast stove.
All biomass boilers often will appear coking phenomenon in fuel combustion process, stove occurs so as to cause burner hearth Phenomena such as fire is not prosperous, fire grate is burnt out.When fuel is in burning, chain is also slowly being run this stove, to destroy block fuel, is made Can not slagging, and export due to chain overturning can be with fragmentation slagging.So using advanced traveling-grate stoker not slagging technology, Hot-blast stove is set to use more efficient automation.
The mating intelligence control system of hot-blast stove of the present invention can control wind turbine by frequency-changing control system, and wind turbine will not be because Blowing out and it is out of service at once, it can slowly run slowly, and stop after flue gas is completely exhausted out furnace body, can effectively prevent Burner hearth discharges the detonation generated not in time because of flue gas, in addition, controlling fan operation by frequency conversion system, can be greatly lowered Noise.
The spiral heat dissipation finned heat pipe group device of indirect chain-arranged type straw hot blast heater is that following technical scheme is taken to realize 's:
The spiral heat dissipation finned heat pipe group device of indirect chain-arranged type straw hot blast heater includes spiral heat dissipation fin heat exchange pipe Splitter cavity, flue fan interface under splitter cavity, flue in group, flue.Spiral heat dissipation fin heat exchange pipe group is mounted on burner hearth rear portion, Gradually row is vertical, and multigroup spiral heat dissipation fin heat exchange pipe group setting may be provided with 120 ~ 400 heat exchanger tubes as needed, in heat exchanger tube Outside weldings have spiral heat dissipation fin, for quickly exchanging heat, reach the exchange of hot and cold air circulation cooling.
The upper and lower splitter cavity of flue is provided with multiple portions, is arranged along its length between each portion, is changed using spiral heat dissipation fin Heat pipe heat cascade.The flue gas transition passage that splitter cavity first changes portion with upper furnace is installed on flue is connected, on flue Splitter cavity is connected by one group of spiral heat dissipation fin heat exchange pipe group with splitter cavity under flue respectively, and splitter cavity passes through another under flue Group spiral heat dissipation fin heat exchange pipe group is connected with the heat exchanging part of splitter cavity on flue, is sequentially communicated.Flue assembling is in machine Frame rear portion is connected with splitter cavity end heat exchanging part.
The indirect chain-arranged type stalk heat of the spiral heat dissipation finned heat pipe group matched with devices of indirect chain-arranged type straw hot blast heater Wind furnace by furnace body, the bright device of radiating fin chip stove, spiral heat dissipation finned heat pipe group device, charging adjust and anti-back-fire device, Automatic chain arranging device, air blower, air-introduced machine, flue wind turbine composition.
The furnace body includes Heat Room, rack, pedestal, fire door, air blast air inlet adjustment handle, damper, heat-insulated envelope Plate, air inlet, air inlet screen plate.Pedestal top connects organic frame.
The bright device of radiating fin chip stove includes that burner hearth, radiating fin, feeding-passage, auxiliary combustion channel, flue gas transition are logical Road.Burner hearth is mounted on pedestal front, and furnace diameter regards stove amount of heat can be between 1.2 ~ 2mm.Burner hearth bottom is equipped with charging Channel is equipped with flue gas transition passage, it is logical that burner hearth rear portion is equipped with auxiliary combustion for conveying stalk fuel in upper furnace Road, burner hearth outside is equipped with radiating fin, for radiating, exchanging heat.Heat dissipation chamber by stove is bright and heat pipe heat outside form with body space.
Air blower is mounted on the right side of pedestal, and blower outlet is connected with chain row's side bellows, and chain arranges side bellows peace There are three above dampers for dress, lead to combustion chamber difference intake for adjusting into chain row by regulation handle, it is ensured that Fuel arranges upper gradient burning in chain, reaches the abundant burner of fuel.Air-introduced machine is mounted on the left of rack, and air-introduced machine is by burner hearth and exchanges heat The clean hot air of heat-exchanging chamber is drawn outside pipe, provides heat source.
Temperature sensor is installed, temperature sensor is connected progress with mating automatically controlling certainly above air-introduced machine connecting tube Dynamic temperature control, it is ensured that hot blast temperature controls in a certain range.
Air inlet is arranged on rear side of furnace body rack and forward right side, and air inlet is equipped with air filtration web plate.
Functional principal, advantage
Before igniting, fuel is added by conveying mechanism by ground hopper for fuel, and feed hopper is placed on chain-grate, chain type Fire grate movement send fuel by the charging of anti-back-fire device, and the anti-back-fire device of feed hopper divides into charging regulating gate, by adjust into Material gate height can adjust into the fuel quantity of fire grate number;Doses after overregulating is evenly distributed on Automatic grate In upper feeding hot wind burner hearth, constantly moved forward by Automatic grate.During Forward, fire grate is speed governing reducing motor, can be led to The speed governing knob of speed regulation frequency converter is crossed to control the speed of fire grate Forward;Meanwhile there is air blower constantly to blow air into chain furnace In row, by 30 degree on chain link tiltedly inverse air outlet air blast into burner hearth, there are three independent cavitys, each cavity to have below fire grate One regulating switch, can by the size of regulating switch come determine into cavity air how much.Fuel is set to obtain continual Continuous burning, the ashes after burning are discharged through fire grate tail portion, and ashes are discharged by ash hole and collect;In fuel combustion process, The flue gas of generation is radiated by the bright radiating fin of stove, is discharged after the heat in burner hearth is radiated by fin heat exchange pipe group by exchanging heat again It is secondary be fully used after extracted out by flue wind turbine and be discharged after water treatment facilities are handled, improve its thermal transition efficiency;Often By being inhaled into below by the heat exchange of fin heat exchange pipe group and the bright radiating fin heat exchange of stove, heat exchange room air is heated warm air, by Air-introduced machine is drawn;Heat source is provided.Meanwhile by temperature sensor and intelligent control device carry out speed governing, control wind and shut down come The temperature for controlling blowing machine mouth, reaches temperature automatically controlled.
(1), hot-blast stove use chain-arranged type power-saving technology feeding, use counter flow combustion mode, i.e. combustion flame in the design Direction and reverse 30 degree of feedstock direction are upward, and adjust air quantity by three groups of air doors, make fuel gradually completely burned by gradient, this Kind combustion system makes heat smoke stream pass through fuel surface, promotes drying and the aqueous vapor evaporation of fuel, fuel is made to be easy to catch fire.Not After-flame carbon granules and fuel gas can burn away with high-temperature flue gas stream on combustion chamber top.High-temperature flue gas after burning passes through stove It is drawn by air-introduced machine after bright entrance several groups of heat exchange air hose groups, confluences and is discharged after entering expansion chamber dedusting.Since hot-blast stove rear portion is matched There is a flue wind turbine, hearth combustion mode is tiny structure burning, has both efficiently controlled high wind in this way by flying dust on fire grate and unburned Burning is blown on most carbon granules, in turn ensure large quantity of air necessary to stalk fuel completely burned.Due to above-mentioned technology and arrange It applies, designed Combustion of Hot Air Furnace efficiency significantly improves, and the consumption of fuel saves 10% or so compared with conventional hot blast stove, and And the frequency of over-emitting black exhaust significantly reduces, and has reached cleaning.
(2), design using the bright directly burning heat dissipation of finned stove and the heat exchange of finned heat-exchange tube group heat-removal modalities, stove is bright Radiating fin heat dissipation area is big, rapid heat dissipation;Devise 120 or more heat-exchange tubes be divided into it is multigroup, pipe surface be designed with spiral dissipate Hot fin forms curtain shape, and heat exchange flow Taoist priest, heat dissipation area is big, and hot-air and each roads Zou Qi reverse heat-exchange of flue gas, heat exchange It is efficient.Major diameter burner hearth has chain-grate in furnace body, can make full combustion of fuel.Heat exchanging chamber divides heat-exchange tube group up and down Multiple heat exchanging part, each heat exchanging part inside include the heat exchanger tube of several same diameters, and multiple heat exchanging part are along furnace body length direction It arranges and concatenates one by one, be located above the heat exchanging part and burner hearth of furnace body front end and be connected to, the heat exchanging part being located above furnace body end Equipped with smoke outlet, it is equipped with smoke evacuation air-introduced machine at smoke outlet, burner hearth is made to form tiny structure burning.The distribution of set of heat exchange tubes is according to furnace body Depending on the heat exchange demand of interior corresponding position, so as to improve heat exchanger effectiveness, heat energy loss is reduced.Adjacent heat exchange portion in heat exchanging chamber Between be interconnected, and be separated by partition between the adjacent heat exchanging part of homonymy, this arrangement processing is simple, heat exchange Thermal current generates mixed flow in heat exchanging part in pipe, generate the hot wind temperature difference between various heat exchange pipe group and same set of heat exchange tubes with Another group of formation hot wind temperature difference, is sufficiently mixed in heat exchanging part, is conducive to next stage heat exchange;Mixed flow again can be by turning simultaneously The deposition cigarette ash at place is rolled, and as thermal current is discharged, plays automatic ash removing cleaning action in pipe.Using floss hole forced fume exhaust side Formula not only improves preheating and control hot wind heating rate, and removes heat exchange part dust using negative pressure, makes hot wind stove Standby automatic cleaning function.
(3), furnace body rear wall and rear wall air inlet is set, air enters furnace body Heat Room by air inlet, by heat exchange Rotation direction hot-blast outlet at sidewall of the furnace body after pipe group spiral heat dissipation fin reverse heat-exchange and the bright radiating fin of stove circumferentially exchange heat, hot wind Exit is equipped with air-introduced machine, and furnace body is discharged in hot wind, and heat source is provided for drying.Since air inlet is arranged after furnace body, side wall, outside By set of heat exchange tubes reverse heat-exchange and the bright radiating fin of stove, circumferentially heat exchange and furnace body carry out heat exchange to portion's air, make full use of stove Thermal energy at body sidewall, reduces heat-energy losses, improves heat exchanger effectiveness.The burner hearth sidewall in high temperature is arranged in hot-blast outlet Place can directly utilize the thermal energy at burner hearth sidewall, prevent its loss, further improve heat exchanger effectiveness.Therefore, in heat exchanger tube Thermal current and extraneous air flow direction on the contrary, thermal current in heat exchanger tube is flowed along flow to smoke outlet direction, Temperature is lower and lower, is finally discharged from the smoke outlet of furnace body end;And extraneous air along reverse flow to hot-blast outlet direction Flowing, temperature is higher and higher, finally the hot-blast outlet discharge from sidewall of the furnace body.
The indirect chain-arranged type stalk heat of the spiral heat dissipation finned heat pipe group matched with devices of indirect chain-arranged type straw hot blast heater Wind furnace feature:
1, the design studies of structure of furnace body, the indirect chain-arranged type straw hot blast heater devise unique radiating fin chip burner hearth The main heat exchange in combustion chamber is existed with the heat exchange structure form being combined with spiral heat dissipation finned heat pipe group pair heat exchange by fuel The structure and the design of heat conduction governing system of direct gradient burning, make stalk briquette fuel burn on special auto chain fire grate Indoor fully burning, quick conductive, can the General Promotion thermal efficiency, realize Efficient Conversion of the biomass energy to thermal energy.
2, the research and development of digital control system monitor leaving air temp in real time by reload temperature sensing system, adjust wind turbine, into Speed is expected to control straw hot blast heater heat supply temperature and control feed time and inlet amount.
3, the Automation Design of feeding system installs mechanical automatic feed mechanism, chain-arranged type autoloader additional by designing Structure, to reduce the labor intensity of worker.
4, the design of smoke dust system, by designing flue structure, improving ash discharging gear and filtrating smoke dust flue gas system, it is ensured that Smog and smoke evacuation meet national requirements for environmental protection, and the UTILIZATION OF VESIDUAL HEAT IN of flue gas is realized by cycle structure design.
5, auto-control Design, point " manual " and " automatic " pattern.Two sets of control systems are devised, a set of is total control box Part, control feeding motor, blower motor, speed regulating reducing discharging machine;Another set of control cabinet is the control section on furnace body, Control blowing machine, chimney meatus draught fan.
Description of the drawings
Below with reference to attached drawing, the invention will be further described
Fig. 1 is the spiral heat dissipation finned heat pipe group device of indirect chain-arranged type straw hot blast heater and its mating indirect chain-arranged type Straw hot blast heater structural front view.
Fig. 2 is the spiral heat dissipation finned heat pipe group device of indirect chain-arranged type straw hot blast heater and its mating indirect chain-arranged type Straw hot blast heater structure right view (having air inlet).
Fig. 3 is the helical fin formula heat-dissipating pipe group schematic device of indirect chain-arranged type straw hot blast heater.
Specific implementation mode
With reference to attached drawing 1~3, the spiral heat dissipation finned heat pipe group device of indirect chain-arranged type straw hot blast heater includes that spiral dissipates Splitter cavity 23, flue fan interface 21 under splitter cavity 22, flue in hot fin heat exchange pipe group 19, flue.Spiral heat dissipation fin changes Heat pipe heat 19 is mounted on 2 rear portion of burner hearth, and gradually row is vertical, and multigroup spiral heat dissipation fin heat exchange pipe group 19 is arranged and can be arranged as needed There are 120 ~ 400 heat exchanger tubes, have spiral heat dissipation fin 24 in heat exchanger tube outside weldings, for quickly exchanging heat, reaches hot and cold air Circulation cooling exchanges.
The upper and lower splitter cavity of flue is provided with multiple portions, is arranged along its length between each portion, is changed using spiral heat dissipation fin 19 cascade of heat pipe heat.Splitter cavity 22 first changes portion and is connected with the flue gas transition passage 6 that upper furnace is installed on flue, cigarette Splitter cavity 22 is connected by one group of spiral heat dissipation fin heat exchange pipe group 19 with splitter cavity under flue 23 respectively on road, is shunted under flue Chamber 23 is connected by another group of spiral heat dissipation fin heat exchange pipe group 19 with the heat exchanging part of splitter cavity on flue 22, is sequentially communicated. Flue wind turbine 20 is connected mounted on 7 rear portion of rack with splitter cavity end heat exchanging part.
The indirect chain-arranged type stalk heat of the spiral heat dissipation finned heat pipe group matched with devices of indirect chain-arranged type straw hot blast heater Wind furnace by furnace body, the bright device of radiating fin chip stove, spiral heat dissipation finned heat pipe group device, charging adjust and anti-back-fire device, Automatic chain arranging device, air blower 14, air-introduced machine 17, flue wind turbine 20 form.
The furnace body includes Heat Room 9, rack 7, pedestal 1, fire door 10, air blast air inlet adjustment handle 11, damper 15, heat-insulated sealing plate 8, air inlet 12, air inlet screen plate 13.1 top of pedestal connects organic frame 7.
The bright device of radiating fin chip stove includes burner hearth 2, radiating fin 3, feeding-passage 4, auxiliary combustion channel 5, flue gas mistake Cross channel 6.Burner hearth 2 is mounted on 1 front of pedestal, and 2 diameter of burner hearth regards stove amount of heat can be between 1.2 ~ 2mm.Pacify 2 bottom of burner hearth Equipped with feeding-passage 4, for conveying stalk fuel, flue gas transition passage 6 is installed on 2 top of burner hearth, 2 rear portion of burner hearth is equipped with Auxiliary combustion channel 5,2 outside of burner hearth is equipped with radiating fin 3, for radiating, exchanging heat.Heat dissipation chamber 9 by stove is bright and heat pipe heat outside with Body space forms.
Air blower 14 is mounted on 1 right side of pedestal, and 14 air outlet of air blower arranges 16 side bellows with chain and is connected, and chain arranges side There are three above dampers 15 for bellows installation, lead to combustion for adjusting into chain row 16 by air blast air inlet adjustment handle 11 Burn room difference intake, it is ensured that fuel arranges upper gradient burning in chain, reaches the abundant burner of fuel.Air-introduced machine 17 is mounted on rack 7 Left side, air-introduced machine 17 draw the clean hot air of heat-exchanging chamber outside burner hearth 2 and heat exchanger tube, provide heat source.
Temperature sensor 18 is installed above air-introduced machine connecting tube, temperature sensor 18 is mutually repeatedly kicked into mating automatically controlling Row is temperature automatically controlled, it is ensured that hot blast temperature controls in a certain range.
The setting of air inlet 12 is equipped with air filtration web plate 13 in 7 rear side of furnace body rack and forward right side, air inlet 12.

Claims (1)

1. a kind of spiral heat dissipation finned heat pipe group device of indirect chain-arranged type straw hot blast heater, it is characterised in that:Including spiral Splitter cavity and flue fan interface under splitter cavity, flue in radiating fin set of heat exchange tubes, flue;Spiral heat dissipation fin heat exchange pipe group Mounted on burner hearth rear portion, gradually row is vertical, has spiral heat dissipation fin in heat exchanger tube outside weldings, for quickly exchanging heat, reaches cold and hot Air cycle heat radiation exchanges;
The upper and lower splitter cavity of flue is provided with multiple portions, is arranged along its length between each portion, using spiral heat dissipation fin heat exchange pipe Group cascade;First heat exchanging part of splitter cavity is connected with the flue gas transition passage that upper furnace is installed on flue, divides on flue Stream chamber is connected by one group of spiral heat dissipation fin heat exchange pipe group with splitter cavity under flue respectively, and splitter cavity passes through another group under flue Spiral heat dissipation fin heat exchange pipe group is connected with the heat exchanging part of splitter cavity on flue, is sequentially communicated;
Multigroup spiral heat dissipation fin heat exchange pipe group is provided with 120 ~ 400 heat exchanger tubes;
Flue assembling is connected at rack rear portion with splitter cavity end heat exchanging part.
CN201510647333.8A 2015-10-09 2015-10-09 The spiral heat dissipation finned heat pipe group device of indirect chain-arranged type straw hot blast heater Active CN105202761B (en)

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CN109899977A (en) * 2019-04-16 2019-06-18 吉林市松花湖实业有限公司 A kind of hot-blast stove and drying system

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