CN2330953Y - Tunnel type internal heat cyclone dryer - Google Patents

Abstract

A tunnel-type internal-heat cyclone drier features that 1-3 rows of trolleys (7-20) are arranged in a sealed drying tunnel, a heat-exchange furnace and a duster are arranged beside the trolleys, the heat-exchange furnace has a cylindrical internal cavity, parallel hollow tubes are arranged in the internal cavity, long radiating fins are arranged at external surface, and a circulating fan is arranged above the drying tube.

Description

Tunnel passage type internal heat whirl drier

The utility model belongs to drying equipment. Present technique provides a kind of interior heat drier of tunnel passage type that is mainly used in the efficient energy-saving of food, because dry gas stream is existing " cross-flow " perpendicular to the moving of car direction in trunk, " following current " and " adverse current " identical and opposite with the moving of car direction are arranged again, so be named as " eddy flow ". This drier is suitable for the materials such as drying sheet, bar, silk and multiple atypic bulk, is particularly suitable for the material of dry water content higher (water content is more than 50 %).

The equipment close with the present invention has tunnel passage type following current, adverse current and mixed flow dryer at present. These several driers are by several dollies that multilayer dose is housed continuous moving and finish dry run by different media flow modes in trunk. The shortcoming that they exist at present is: 1. thermal loss is larger, and this is mainly caused by two aspects: the first, and the heat delivery loss. Because this class channel oven all is external-heat at present, namely provide the hot-blast stove of drying medium and corresponding attached deduster thereof and conveyance conduit all to be positioned at outside the drier, air is after the independent heat exchange of hot-blast stove, input again drier, so, in heat exchange and course of conveying, quite a few dissipation of heat is in the middle of air. The second, lost a large amount of heat energy owing to smog discharge temperature is high. Hot-blast stove (take coal, fuel oil, combustion gas as fuel) enters atmosphere in combustion process flue-gas temperature is higher, and generally all at 150-180 ℃, the heat of this part of smoke also fails effectively to be used. And hot blast smog discharge temperature of the present invention only is 50-60 ℃, and by contrast, the former heat energy runs off in a large number. 2. can't provide according to the dry materials process conditions such as best temperature, humidity. The agricultural byproducts that water content is larger (general water content is all more than 50%) are longer drying time, and the drying and dehydrating amount is large, also has certain thermal sensitivity, and the dry initial stage of General Requirements is adopted higher running temperature, to improve rate of drying. Along with the continuity of dry process, in the reduction of the later stage of drying along with material moisture, the drying medium temperature also should progressively reduce, to guarantee the product product quality; Also require simultaneously to make every effort to keep a kind of lower medium relative humidity in the overall process of drying, be beneficial to take away material moisture.

At present and the similar channel oven of this law the type of flow of downflow type, reverse-flow and simple mixed-flow, desired desirable drying condition above all can not reaching preferably in the distribution of the dielectric gas type of flow, heat and humidity are arranged.

1. the downflow type drying is that the flow direction of hot-air is consistent with the dolly direction of advance in the trunk, the major defect that the drier of this mode exists is: dry air dielectric is with after material contacts, process along with drying, medium air humidity constantly raises, cause the dry materials speed in later stage very slow, production declining, cost raises.

2. reverse-flow drying is that the flow direction of hot-air is opposite with the dolly direction of advance in the trunk, its major defect is: dry high temperature air medium contacts with the low material of dry water content that is near completion at the very start, if medium temperature is too high, very easily cause material to be charred, destroy product quality, if medium temperature is fallen excessively lowly, rate of drying is reduced greatly, can't take away the moisture of fresh material. So medium temperature is difficult for reaching two and takes into account. The steam that to also have a shortcoming be exactly Absorption of Medium is condensate in above the wet stock that enters at first drier easily, affects drying capacity.

3. in order to overcome above-mentioned shortcoming, sometimes also adopt mixed-flow, trunk is divided into two sections, one section is adopted downflow type, and another section adopts reverse-flow. But this mode also only is the combination of simple co-current flow and counter-current flow, according to the characteristic of dry process and material the temperature and humidity in different dry processes is not regulated, can't overcome simultaneously the shortcoming of co-current flow and counter-current flow,, be in the medium temperature of adverse current section and humidity and also can't carry out dynamic regulation and reach desirable level because the contradictory problems of being charred of causing of temperature and rate of drying does not just solve such as counter-current drying latter stage.

The purpose of this invention is to provide a kind of Novel dryers, adopt temperature, humidity and the flow of drying medium in unique structure and the whole dry run of rational allocation, take full advantage of heat energy, improve drying efficiency and output, guarantee product quality, reduce drying cost.

Detailed description of the present invention and embodiment: the total arrangement mode of (one) dolly, recuperative furnace and deduster in drier

Place the dolly that the 1-3 row are parallel to each other and direction of advance is consistent in airtight dry trunk, the long 6-40m in hole generally is no more than 30m; The wide 3-6m in hole, high 1.5-3.5m. The columns of dolly and the joint number of every row can change as required, are generally 1-3 row, save for 7-20 as every row. Dolly arranges some tabula framves, places entry table with layering. With the dolly direction that parallels of advancing the recuperative furnace that adopts coal, oil or combustion gas is set on dolly next door, recuperative furnace is all built-in with the deduster that is attached thereto. Mainly by body of heater and around the air of the heat radiation effect of the deduster that is attached thereto and flue and convection current heat is passed to air dielectric in the hothouse. The direction of advance of dolly as shown in Figure 1.

Recuperative furnace (7) has two kinds of arrangement modes with deduster (8). The first, recuperative furnace and deduster are connected with each other in alignment, and this straight line is parallel with the direction that dolly moves, and is positioned at inner corresponding with the circulating fan opposite side of hothouse. Fig. 1 is its plane, and Fig. 3 is its profilograph. The second, the straight line that recuperative furnace links to each other with deduster is vertical with the dolly moving direction, and each recuperative furnace and a deduster form one group, all distribute in inner corresponding with the circulating fan side of hothouse, and each distributed points is comprised of 1-2. (every group is each 1 of recuperative furnace, deduster), the distance that each distributed points is separated by generally is no less than 1.5m, Figure 7 shows that its plane, Figure 6 shows that its drawing in side sectional elevation.

In above dual mode, no matter take any mode to arrange, recuperative furnace and deduster all are in sustained height with dolly in hothouse, and are positioned at dolly next door, the opposite side corresponding with circulating fan. Recuperative furnace, deduster and attached flue all place in the drier.

(2) unique radiator structure of recuperative furnace

1. recuperative furnace size and tubular structure

The size of recuperative furnace, number and setting space are decided according to the output size, and furnace diameter is generally more than 0.4m, highly generally at 1-3m. Thorax is made interior empty cylinder in the recuperative furnace, and above the combustion chamber of body of heater, embed several in horizontal direction, vertical and parallel to each other with dolly direction of advance hollow pipe, combustion flame in stove and flue gas then rise in coiling outside the hollow transverse tube, within the burner hearth, then pass through deduster (8), pass through again the smoke tube (12) that on horizontal plate washer (14), is horizontal distribution, enter atmosphere finally by crossing the vertical smoke tube that distributes and chimney (22). Hollow caliber is (shown in a of Figure 13) about 100-200mm, from about the 100mm of fuel inlet (18) top, begins to arrange, until stove top, as shown in Figure 5. In order to make flue gas smoothly by again fully heat radiation, hollow pipe is the dense arrangement of certain distance, and the distance between the tube wall is at (shown in the b among Figure 13) about 150-200 mm.

2. heat radiating fin structure

The outside also is provided with strip fin (15) around recuperative furnace, and the spacing between the fin is generally 50mm, height 50-100mm, thickness 3-8mm. Fin is distributed in the position corresponding with the combustion chamber, the body of heater outside, from than the slightly low body of heater position of flame combustion, is discharged to the top always. The design of fin such as Fig. 4, shown in Figure 5.

By above-mentioned two kinds of structures, the high-temperature flue gas that combustion process is produced not only passes through the recuperative furnace shell, also by the fin of recuperative furnace outside and hollow pipe, outer case of dust remover and the smoke tube of inner embedding, further strengthened the indirect heat exchange area with the drier inner air, make that the heat that produces is fully distributed utilization in burning and the course of conveying, this be the external heat exchanger stove can't be obtained.

(3) air (drying medium) in unique flue gas and drying medium circulatory system flue gas and the drier is a minute open shop.

(1) coal burns the high-temperature flue gas that produces through the hollow pipe outer wall in recuperative furnace, from recuperative furnace (7) top out, after cyclone dust collectors (8) dedusting, enter atmosphere by the smoke tube (12) of horizontal positioned, vertical flue and chimney (22) successively again.

What (2) (tube wall is inboard) flowed in the middle of hollow pipe then is to blow over next drying medium through circulating fan, after the hollow pipe heat radiation, enters hothouse, is separated from each other with flue gas. The running route of this system is as follows: on the cross section of drier, (such as Fig. 2, Fig. 3, Fig. 6, shown in Figure 10). The top of dolly and two sides that parallel with the direction of motion are the air-flow plate washer, the circulating fan that the fresh air that enters from feeding gate (24) and discharge door (25) respectively is positioned at dolly top drives, be positioned at the circular motion of doing within horizontal baffle (14) on the dolly and the vertical clapboard (5) perpendicular to the dolly moving direction, route is before this from blower fan, take away the heat that horizontal smoke tube (12) gives off, when arriving deduster and recuperative furnace, take away again around deduster and the heat exchange body of heater and heat that hollow pipe gives out, the air that is heated the again neutral gear below vertical baffle (4) enters the hothouse of arranging dolly, material is carried out drying, and then the next vertical baffle of process is up got back to circulating fan, enter next circulation, so repeatedly carry out. It is the drier top above circulation fan, also be provided with at a certain distance steam vent 9.10, (sub valve is 26 to be positioned on each extraction flow control valve on the steam vent pipeline by adjusting, total valve is 20) can determine what and position of capacity the humid air in the drier to be entered atmosphere. The hole that capacity is large is the main exhaust hole, the position in main exhaust hole has just determined combination and the section of following current or adverse current, make dry gas stream when the department that does perpendicular to the circular motion of moving of car direction, also do to be parallel to the dolly moving direction forward and reverse flow. What the present invention adopted is mixed-flow, and dolly enters after the drier, is introduced into the following current stage of 1/4 running length, and all the other 3/4 are adverse current. So main steam vent also will be positioned at when dolly has just entered drier to be counted, and accounts for the position of operation total length 1/4. The direction of motion of dry gas stream as shown in figure 10.

Advantage of the present invention and good effect: 1. adopted unique structure, this patent drier heat utilization efficiency has been improved more than 30% than general external hot wind furnace formula tunnel drier; Through recuperative furnace and pipeline, the flue-gas temperature of discharging at last also only is 50-60 ℃, and general hot-blast stove is up to 150-180 ℃. Advantage of the present invention is mainly manifested in following three aspects:

1. because heat exchange body of heater and attached cyclone dust collectors thereof, the major part of flue (account for total length 3/4) all places drier inner, formed the unique inside heat exchange system of a cover, the heat that combustion process is produced directly is dispersed in the drier by recuperative furnace, has avoided external heat exchanger fully and the transfer heat loss that causes; The heat of flue gas is fully utilized.

2. because the heat exchange body of heater has adopted unique fin in conjunction with the radiator structure of interior vacant duct, further improved the heat replacement rate of recuperative furnace.

3. owing to adopted unique loop structure, realized rational medium circulation mode, rational temperature, humidity regulation mode and exhaust mode, major embodiment goes out following advantage:

A. unique medium cross-flow campaign. In this drier, drying medium is ordered about by circulated air (2), between circulating fan-recuperative furnace-material-circulating fan, do circulating perpendicular to the moving of car direction, make material surface each several part all contact and do strong relative motion with drying medium, accelerated rate of drying, such as Fig. 3, shown in Figure 10.

B. unique suitable, adverse current combination and temperature, humidity regulation system. Drying medium is also done adverse current and following current campaign along the moving of car direction when carrying out cross-flow, formed the mode of unique mistake, suitable, adverse current combination, and air-flow is spiral following current and spiral stem. Just entered drier 1/4 following current section at material, the low humid air of high temperature that enters from feeding gate can make material heat up and discharge moisture fast; Adverse current section of 3/4 after this, medium then enters from discharge door with the form of middle low temperature and low humidity, and the material that makes the later stage of drying is unlikely to be subjected to high temperature and the low moisture that is charred and further is dried to requirement. Adverse current propelling along with drying medium, during the higher material of medium contact water content, can carry out segmentation by the temperature automatic induction system to medium with all the body of heater parallel with dolly heats, and by the suitable combustion gas of exhaust blower, making medium when temperature raises, humidity also remains at low-level, continue to have the high wet ability of carrying, like this, the temperature and humidity in whole dry run is in desirable state all the time, has overcome the in the past shortcoming of hole formula drier fully. The high moisture material dry run sees Table 1. (dry high moisture material is to the General Requirements of medium) to the requirement of medium, and the characteristic of this law design drier sees Table 2. (different driers are in the performances of dry run medium temperature, humidity).

C. structure and unique shuttling movement mode of drying medium and the cooperation of air intake-exhaust by above uniqueness, make medium in the temperature of different phase, the regulation and control that humidity reaches science, not only formed a whole set of rational drying condition, having overcome in the past, tunnel drier can not carry out the different shortcomings that have with the media flow mode of dynamic temperature-regulating damping, also greatly improve heat transfer rate, drying efficiency and output, reduced drying cost.

2. the requirement according to invention designs, has manufactured corresponding drying equipment, it is as follows to draw the operation result contrast: the hothouse of Novel dryers (trunk) is of a size of 5.5m * 18m * 3m, 40 of in-built small handcarts, 6 * 150,000 kilocalories of configuration recuperative furnace (hot-blast stove)/platform=900,000 kilocalories, the aquatic foods material water content of material of being dried is 70%, when the siccative water content is 10%, output reaches 7200 kilograms/24 hours, and coal consumption is 5280 kilograms/24 hours. Ton product coal consumption then is 733 kg/tonnes.

Old type channel oven originally (totally 6, per 1 is disposed 150,000 kilocalorie recuperative furnaces, has carried out the drying contrast of equal material with old-fashioned operation method), per 24 hourly outputs are 5460 kilograms, total coal consumption was 6900 kilograms in 24 hours. Then ton product coal consumption is 1264 kg/tonnes.

1. output relatively: hourly output is 50 kilograms to Novel dryers (by the yield meter of 1 150,000 kilocalorie recuperative furnace), and old type is per hour 37.9 kilograms. Novel than old type drier raising output 31.9%.

2. dry similar material finished product coal consumption per ton relatively: novel is 733 kg/tonnes, and old type is 1264 kg/tonnes. Novelly economize on coal 42% than old type. Find out that thus the design's drier raising output and energy-saving effect are very remarkable.

The dry high moisture material of table 1. is to the General Requirements of medium

	The dry initial stage	Dry mid-term	The later stage of drying
				Temperature	High temperature	Middle temperature	Middle temperature
Humidity	Low humidity	Low humidity	Low humidity

The different driers of table 2. are in the performance of dry run medium temperature, humidity

The drier type		The dry initial stage	Dry mid-term	The later stage of drying	Effect and analysis
						Contrary 1. streamings	Temperature	In	In	High	1, initial temperature can not be high, otherwise easily stick with paste. 2, temperature is controlled bad easy quality and the quality of affecting.
Humidity	High	In	Low
				Along 2. streamings	Temperature		High	In	In	1, the later stage drying property descends. 2, be subjected to the impact of temperature, dry ability is not high.
Humidity	Low	In	In
					This law 3. (interior hot spiral-flow formula)	Temperature	High	In	In		Quality be can keep, heat utilization efficiency and output improved.
Humidity	Low	In low	Low

As can be seen from Table 2, the drying condition of the present invention's design is ideal.

Fig. 1 drier plane Fig. 2 drier profilograph Fig. 3 drier drawing in side sectional elevation Fig. 4 recuperative furnace top view Fig. 5 recuperative furnace front view Fig. 6 recuperative furnace and 17. hollow pipe 5. vertical clapboards, 18. fuel inlets (coal) of deduster Local map Fig. 7 drier plane Fig. 8 recuperative furnace boring pipe Pareto diagram Fig. 9 fume emission path profile Figure 10 drying medium flow graph Figure 11 drier plane (omission chimney) Figure 12 drier plane (omission circulation motor) Figure 13 hollow pipe dimensional drawing Figure 14 hollow pipe partial enlarged drawing 1. small handcarts 14. horizontal baffles 2. circulating fans 15. fin 3. guide rails 16. heat exchanger smoke tubes 4. vertical baffles are circulation motor 19. slag-drip openings 7. recuperative furnaces 20. 6.(main valve 8. dedusters 21. guide rail car 9. steam vents, 22. smoke tubes (containing chimney) are 25. (discharging) 13. waste gas ducts of 24. (charging) 12. smoke tubes of steam vent 23. air-introduced machines 11. dolly propellers, 26. extraction flow control valves (minute valve) 10. for the extraction flow control valve

Claims (2)

1, tunnel passage type internal heat whirl drier, it is characterized in that before and after the airtight dried hole feeding gate 24 and discharge door 25 being arranged, placing the 1-3 row dolly consistent with direction of advance 1 quantity that is parallel to each other in the road is the 7-20 joint, trunk has guide rail 3 outward, guide rail car 21 has dolly propeller 11 in the hole, with the dolly parallel direction of advancing recuperative furnace 7 and deduster 8 are set on dolly next door, recuperative furnace and deduster and dolly are in sustained height, and are positioned at the dolly next door; Thorax is made interior empty cylinder in the recuperative furnace; And above the combustion chamber of body of heater, embed vertical with the dolly direction of advance in horizontal direction, and hollow pipe 17 parallel to each other, the outside also is provided with strip fin 15 around recuperative furnace, fin is distributed in the position corresponding with the combustion chamber, the body of heater outside, the recuperative furnace top has a heat exchanger smoke tube 16 to link to each other with deduster, dust remover roof has a smoke tube 12, link to each other with chimney 22 with vertical flue, end at smoke tube has circulating fan 2 and circulation motor 6, there is steam vent 9 top of circulating fan, 10, the end of steam vent connects waste gas duct 13, has the extraction flow control valve to divide valve 26 at corresponding vent, main valve 20 and air-introduced machine 23, there are horizontal plate washer 14 and hard straight plate washer 4 in the top of dolly and two sides that parallel with the direction of motion, also have hard straight baffle 5 on dolly.

2, drier as claimed in claim 1, the position that it is characterized in that recuperative furnace and deduster can be connected with each other in line, this straight line is parallel with the direction that dolly moves, be positioned at inner corresponding with the circulating fan opposite side of drier, perhaps the straight line that links to each other with deduster of recuperative furnace is vertical with the dolly moving direction, each recuperative furnace and a deduster form one group, all distribute in inner corresponding with the circulating fan side of hothouse.

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