CN217929221U - Self-heating hot air integrated furnace - Google Patents

Abstract

The utility model discloses a hot-blast integrative stove of self-heating formula, it belongs to biomass fuel hot-blast furnace field. The novel furnace mainly comprises a furnace body, wherein a combustion chamber is arranged in the furnace body, a third heat exchange cavity is arranged outside the combustion chamber, a second heat exchange cavity is arranged outside the third heat exchange cavity, a flue gas circulating pipeline is arranged in the second heat exchange cavity, one end of the flue gas circulating pipeline is hermetically connected with the top of the combustion chamber, the other end of the flue gas circulating pipeline extends out of the second heat exchange cavity, the second heat exchange cavity is communicated with the third heat exchange cavity, the second heat exchange cavity is communicated with a first air inlet, and a hot air outlet is formed in the third heat exchange cavity. The utility model discloses effectively combine biomass fuel combustor and hot-blast furnace, heat exchange efficiency and fuel heat utilization efficiency improve greatly to add filtering mechanism in the combustion chamber, add the detachable baffle that can clear up tar bottom the straight tube of flue gas circulating line, thereby avoided tar to block up flue gas pipe wall, prolonged flue gas circulating line's life. The utility model discloses mainly used burning heat transfer.

Description

Self-heating hot air integrated furnace

Technical Field

The utility model belongs to biomass fuel hot-blast furnace field, specifically speaking especially relates to a hot-blast integrative stove of self-heating formula.

Background

The biomass fuel is a novel clean fuel, mainly takes straw, sawdust and other agricultural and forestry wastes as raw materials, and is a granular or blocky fuel formed by crushing, mixing, extruding and drying. The biomass fuel releases a large amount of heat energy after being combusted, can be used for heating of users, and can also be used for assisting the tea drying of a tea dryer. When the biomass fuel burner is used for heating, the biomass fuel burner needs to be matched with a special hot blast stove to better recover heat in flue gas.

The existing biomass fuel burner and the hot blast stove are two independent products, and when the two independent products are used in a combined manner, the two independent products have the following defects: firstly, the occupied area is large, and the manufacturing cost of the product is high; secondly, the heat of the flue gas is recovered independently, so that the thermal efficiency of the hot blast stove is low, the thermal efficiency is only 30 percent, and the heat waste is serious; thirdly, because the thermal efficiency of the hot blast stove is low, the utilization rate of the heat energy generated by the fuel is low, so that the consumption of the fuel is increased, and the production cost is greatly increased by taking tea drying as an example; fourthly, the biomass fuel can produce a large amount of tar substances and smoke dust after being combusted, and the tar and the smoke dust can be attached to the wall of a smoke pipe of the hot blast stove, so that the heat exchange effect is increasingly poor after the hot blast stove is used for a period of time.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: overcome prior art's not enough, provide a hot-blast integrative stove of self-heating formula, this integrative stove effectively combines biomass fuel combustor and hot-blast furnace, and heat exchange efficiency and fuel heat utilization rate improve greatly to add filtering mechanism in the combustion chamber, add the detachable baffle that can clear up tar bottom the straight tube of flue gas circulating line, thereby avoided tar jam flue gas pipe wall, prolonged flue gas circulating line's life.

The self-heating type hot air integrated furnace comprises a furnace body, wherein a combustion chamber is arranged in the furnace body, a third heat exchange cavity is arranged outside the combustion chamber, a second heat exchange cavity is arranged outside the third heat exchange cavity, a flue gas circulation pipeline is arranged in the second heat exchange cavity, one end of the flue gas circulation pipeline is hermetically connected with the top of the combustion chamber, the other end of the flue gas circulation pipeline extends out of the second heat exchange cavity, the second heat exchange cavity is communicated with the third heat exchange cavity, the second heat exchange cavity is communicated with a first air inlet, and a hot air outlet is formed in the third heat exchange cavity.

Preferably, the outer side of the second heat exchange cavity is provided with a first heat exchange cavity, the bottom of the first heat exchange cavity is provided with more than one strip-shaped air inlet, the upper part of the first heat exchange cavity is communicated with the second heat exchange cavity through an air guide plate, and the air guide plate inclines downwards.

Preferably, an air inlet flow guide cover is arranged on the furnace body, one side of the air inlet flow guide cover is communicated with the first air inlet, the bottom of the air inlet flow guide cover is communicated with the second heat exchange cavity, and a plurality of baffles matched with the flue gas circulation pipeline are arranged in the second heat exchange cavity.

Preferably, the upper part of the third heat exchange cavity is provided with a second circulating air inlet communicated with the second heat exchange cavity, a first spiral guide plate which is spirally arranged is arranged between the inner wall of the third heat exchange cavity and the outer wall of the combustion chamber, and the hot air outlet is arranged at the lower part of the third heat exchange cavity.

Preferably, a second spiral guide plate which is spirally arranged is installed in the first heat exchange cavity.

Preferably, the flue gas circulating pipeline comprises a plurality of straight pipes and connecting bent pipes which are connected in a circulating mode, and the bottoms of the straight pipes are provided with detachable baffles.

Preferably, a cross rod is fixed at the upper end in the combustion chamber, a filtering mechanism is hung on the cross rod and comprises a metal filtering cover and a metal filtering net, the metal filtering net is hung at the lower end of the metal filtering cover through a hook, and small holes are formed in the metal filtering cover.

Preferably, the metal filter cover and the metal filter screen are formed by splicing a plurality of arc-shaped structures with the same structure, and a clamping plate is arranged between every two adjacent arc-shaped structures on the metal filter screen.

Preferably, a power mechanism is arranged on one side of the furnace body and is connected with a spiral feeder through a chain wheel, the tail end of the spiral feeder extends into the combustion chamber, a hopper is arranged above the spiral feeder, and an ignition port communicated with the combustion chamber is arranged on the furnace body.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses add three heat transfer chamber in proper order outside the combustion chamber, make clean air carry on preliminary preheating through outmost first heat transfer chamber, carry on second heat transfer chamber and flue gas circulating line and get into formal heat transfer, get into the third heat transfer chamber at last and get into after-heating exhaust utilization, improved heat exchange efficiency greatly, make the heat utilization rate fully promoted;

2. the filter mechanism is additionally arranged in the combustion chamber, smoke generated by fuel combustion can filter most of tar substances and smoke dust through the metal filter screen and the metal filter cover on the filter mechanism, the cleaning pressure of a smoke circulating pipeline is relieved, and the metal filter cover and the metal filter screen are spliced by a plurality of arc-shaped structures with the same structure, so that the processing, the manufacturing and the dismounting are convenient;

3. the detachable baffle is additionally arranged on the flue gas circulating pipeline, so that tar substances on the inner wall of the pipeline can be conveniently cleaned at the later stage, and the use is convenient;

4. the utility model discloses effectively combine biomass fuel combustor and hot-blast furnace, compact structure, area is little, and it is long when having increaseed the heat transfer area and the heat transfer of flue gas, effectively improved the heat utilization rate of heat exchange efficiency and fuel to reduce the quantity of fuel, saved the stoving cost of tealeaves.

Drawings

Fig. 1 is a schematic external structural view of the present invention;

FIG. 2 is a schematic view of the internal structure of the present invention;

FIG. 3 is a schematic view of the first heat exchange chamber mated with the second heat exchange chamber;

FIG. 4 is a schematic view of the connection of the air intake shroud and the second heat exchange chamber;

FIG. 5 is a schematic structural view of a flue gas circulation duct;

fig. 6 is a front view of the present invention;

FIG. 7 isbase:Sub>A sectional view taken along line A-A of FIG. 6;

FIG. 8 is a schematic diagram of the flue gas circulation of the present invention;

fig. 9 is a schematic disassembled view of the filter mechanism.

In the figure, 1, a furnace body; 2. an observation port; 3. cleaning an ash hole; 4. a second air inlet; 5. an ignition port; 6. a power mechanism; 7. a screw feeder; 8. a hopper; 9. a flue gas outlet; 10. a first air inlet; 11. a hot air outlet; 12. a first heat exchange chamber; 13. a second heat exchange chamber; 14. a baffle plate; 15. a third heat exchange cavity; 16. a flue gas circulation duct; 17. a combustion chamber; 18. a circulating air inlet I; 19. an air inlet guide sleeve; 20. inserting plates; 21. a circulating air inlet II; 22. a first spiral baffle; 23. a second spiral baffle; 24. an air deflector; 25. a strip-shaped air inlet; 26. a top cover; 27. an annular seal cover; 28. a metal filter housing; 29. a metal filter screen; 30. provided is a clamping plate.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

example 1:

as shown in fig. 1 and 2, the self-heating type hot air integrated furnace comprises a furnace body 1, a combustion chamber 17 is arranged in the furnace body 1, the combustion chamber 17 is arranged in the center of the inside of the furnace body 1, a third heat exchange cavity 15 is arranged on the outer side of the combustion chamber 17, a second heat exchange cavity 13 is arranged on the outer side of the third heat exchange cavity 15, a flue gas circulation pipeline 16 is arranged in the second heat exchange cavity 13, a flue gas inlet at one end of the flue gas circulation pipeline 16 is connected with the top of the combustion chamber 17 in a sealing manner, a flue gas outlet at the other end of the flue gas circulation pipeline 16 extends out of the second heat exchange cavity 13, the second heat exchange cavity 13 is communicated with the third heat exchange cavity 15, the second heat exchange cavity 13 is communicated with a first air inlet 10, and a hot air outlet 11 is arranged on the third heat exchange cavity 15.

When the tea leaf drying device is used, a smoke inlet on the smoke circulating pipeline 16 is connected with the draught fan, the first air inlet 10 is connected with the air blower, clean air is blown into the second heat exchange cavity 13, the number of the heat exchange channels in the tea leaf drying device is two, the clean air enters the second heat exchange cavity 13 through the first air inlet 10 and exchanges heat with the smoke circulating pipeline 16 in the second heat exchange cavity 13, the clean air enters the third heat exchange cavity 15 after exchanging heat, the clean air further exchanges heat with the combustion chamber 17, the temperature of the clean air is further improved through heat exchange with the combustion chamber 17, and the temperature reaches over 140 ℃, so that the temperature required by tea leaf drying is reached.

Example 2:

as shown in fig. 4, a first heat exchange cavity 12 is arranged outside the second heat exchange cavity 13, as shown in fig. 6 and 7, one or more strip-shaped air inlets 25 are arranged at the bottom of the first heat exchange cavity 12, a second air inlet 4 matched with the strip-shaped air inlets 25 is arranged on the outer wall of the furnace body 1, in this embodiment, four second air inlets 4 and four strip-shaped air inlets 25 are arranged, as shown in fig. 8, the upper part of the first heat exchange cavity 12 is communicated with the second heat exchange cavity 13 through an air guide plate 24, and the air guide plate 24 is inclined downward; an air inlet flow guide sleeve 19 is arranged on the furnace body 1, one side of the air inlet flow guide sleeve 19 is communicated with a first air inlet 10, the bottom of the air inlet flow guide sleeve 19 is communicated with a second heat exchange cavity 13, during machining, as shown in figure 4, the bottom of the air inlet flow guide sleeve 19 is communicated with a top cover 26 on the upper portion of the second heat exchange cavity 13, as shown in figure 3, an annular sealing cover 27 is arranged below the top cover 26, a first circulating air inlet 18 is formed in the annular sealing cover 27, the first circulating air inlet 18 and the bottom of the air inlet flow guide sleeve 19 are arranged in a staggered mode, a plurality of baffle plates 14 matched with a flue gas circulating pipeline 16 are arranged in the second heat exchange cavity 13, and the baffle plates 14 are used for blocking air so that the contact time of the air and the flue gas circulating pipeline 16 is prolonged, and therefore the heat exchange efficiency is improved. The rest is the same as in example 1.

In this embodiment, on the basis of embodiment 1, add first heat transfer chamber 12, further retrieve the outside heat in second heat transfer chamber 13, first heat transfer chamber 12 is under the effect of the air-blower vigorously blowing, presents the negative pressure state to in inhaling the preheated air in first heat transfer chamber 12 in second heat transfer chamber 13, simultaneously, make the heat of furnace body 1 outer wall can fall to below 50 ℃, present warm state, compare in traditional hot-blast furnace heat utilization rate and improve greatly.

Example 3:

as shown in fig. 2 and 8, a second circulating air inlet 21 communicated with the second heat exchange cavity 13 is formed in the upper portion of the third heat exchange cavity 15, a first spiral guide plate 22 which is spirally arranged is installed between the inner wall of the third heat exchange cavity 15 and the outer wall of the combustion chamber 17, and the hot air outlet 11 is formed in the lower portion of the third heat exchange cavity 15; a second spiral guide plate 23 which is spirally arranged is arranged in the first heat exchange cavity 12. The rest is the same as in example 2.

First spiral guide plate 22 and second spiral guide plate 23 make the air along the guide plate direction, and the corresponding heat transfer chamber of spiral entering has increased heat transfer area through three heat transfer chamber and air heat transfer, has prolonged the contact time in air and heat transfer chamber simultaneously, has promoted heat exchange efficiency, makes the heat utilization rate of fuel improve greatly to reduce the quantity of fuel, saved manufacturing cost.

Example 4:

as shown in fig. 5, the flue gas circulation pipeline 16 comprises a plurality of straight pipes and connecting bent pipes which are circularly connected, and the bottom of each straight pipe is provided with a detachable baffle 14; when the baffle plate 14 is installed, the baffle plate can be connected with the bottom of the straight pipe in a sealing mode in an inserting mode, and can also be connected in a rotating sealing mode in a mode of additionally arranging a hinge shaft. By opening the flap 14, tar in straight pipes or connecting bends can be cleaned efficiently by existing tools. During the preparation, the height of connecting the return bend can increase as far as possible to increase the baffle in connecting the return bend, in order to increase the heat transfer area of flue gas, the baffle also can prolong the heat transfer time of flue gas and air.

A cross rod is fixed at the upper end in the combustion chamber 17, a filtering mechanism is hung on the cross rod, as shown in fig. 9, the filtering mechanism comprises a metal filtering cover 28 and a metal filtering net 29 which are arranged up and down, the metal filtering net 29 is hung at the lower end of the metal filtering cover 28 through a hook, small holes are formed in the metal filtering cover 28, the small holes in the top of the metal filtering cover 28 are sparse, the small holes are denser downwards, smoke is prevented from being directly discharged, and the filtering effect is greatly improved; during processing, the metal filter cover 28 and the metal filter screen 29 are formed by splicing a plurality of arc structures with the same structure, two arc structures are spliced in fig. 9 for illustration, and a clamping plate 30 is installed between two adjacent arc structures on the metal filter screen 29. The rest is the same as in example 3. The metal filter cover 28 and the metal filter screen 29 are used for filtering tar and smoke dust in the smoke, and can be taken out and cleaned periodically, so that the attachment amount of tar on the pipe wall of the smoke circulating pipeline 16 is reduced. The cross bar, the metal filter cover 28 and the metal filter screen 29 are all made of refractory materials.

This kind of structure makes things convenient for the installation of metal filter cover 28 and metal filters 29 and takes, and the installation and take all pass through in the viewing aperture 2 of furnace body 1, during the installation, leave the clearance between metal filter cover 28 and metal filters 29 and the combustion chamber 17 inner wall, and do not need strictly align between the two adjacent arc structures, spacing through cardboard 30 can, its gap can make better the passing through of flue gas.

As shown in figure 1, a power mechanism 6 is arranged on one side of a furnace body 1, the power mechanism 6 is connected with a spiral feeder 7 through a chain wheel, the tail end of the spiral feeder 7 extends into a combustion chamber 17, a hopper 8 is arranged above the spiral feeder 7, and an ignition port 5 communicated with the combustion chamber 17 is arranged on the furnace body 1.

As shown in FIG. 8, when the utility model is used, the flue gas inlet on the flue gas circulating pipeline 16 is connected with the draught fan, and the first air inlet 10 is connected with the blower.

The biomass fuel is filled into the hopper 8, the power mechanism 6 is started, the power mechanism 6 sends the biomass fuel to a fire grate of the combustion chamber 17 through the spiral feeder 7, the igniter extends into the ignition port 5 to ignite the biomass fuel, the biomass fuel is combusted on the fire grate, generated flue gas enters the flue gas circulation pipeline 16 for circulating heat exchange after being filtered through the metal filter screen 29 and the metal filter cover 28, and finally is discharged out of a room through the induced draft fan.

After the biomass fuel is combusted, slag is discharged through the ash removing port 3, meanwhile, the observation port 2 is additionally arranged on the furnace body, the observation port 2 is in a closed state under the normal condition, and when the furnace is shut down for maintenance, the metal filter screen 29 and the metal filter cover 28 can be taken out through the observation port 2 for cleaning.

In the process, the blower is started, the blower blows air into the second heat exchange cavity 13 through the first air inlet 10, and in the process, a part of air is directly blown into the flue gas circulation pipeline 16 in the second heat exchange cavity 13 for heat exchange; the other part of air is guided by an air guide plate 24 to generate negative pressure in the first heat exchange cavity 12, the part of air enters a strip-shaped air inlet 25 at the bottom of the first heat exchange cavity 12 through a second air inlet 4 on the furnace body 1, the part of air enters the second heat exchange cavity 13 along a first spiral guide plate 22 in the first heat exchange cavity 12, residual waste heat of the second heat exchange cavity 13 is recovered in the first heat exchange cavity 12, the part of air enters the second heat exchange cavity 13, is blocked by a baffle plate 14 and exchanges heat with a flue gas circulation pipeline 16 in the second heat exchange cavity 13, so that the air temperature is raised, then enters the third heat exchange cavity 15 through a circulation air inlet 21, the third heat exchange cavity 15 is in contact with the combustion chamber 17, the cavity temperature is the highest, the air is guided by a second spiral guide plate 23 to exchange heat fully with the combustion chamber 17, and finally the air after heat exchange is discharged through a hot air outlet 11, at this time, the hot air temperature can reach 140 ℃, and drying operation can be performed; after the waste heat is recovered by the first heat exchange cavity 12, the temperature of the outer wall of the furnace body 1 is below 50 ℃, and only a damp and hot state is presented; discharged flue gas temperature is after the heat transfer, and the temperature can be reduced to below 90 ℃, compares in the high temperature flue gas that prior art discharged, the utility model discloses heat utilization rate has been improved greatly.

Claims (9)

1. A self-heating type hot air integrated furnace is characterized in that: the boiler comprises a boiler body (1), a combustion chamber (17) is arranged in the boiler body (1), a third heat exchange cavity (15) is arranged on the outer side of the combustion chamber (17), a second heat exchange cavity (13) is arranged on the outer side of the third heat exchange cavity (15), a flue gas circulating pipeline (16) is arranged in the second heat exchange cavity (13), one end of the flue gas circulating pipeline (16) is connected with the top of the combustion chamber (17) in a sealing mode, the other end of the flue gas circulating pipeline (16) extends out of the second heat exchange cavity (13), the second heat exchange cavity (13) is communicated with the third heat exchange cavity (15), the second heat exchange cavity (13) is communicated with a first air inlet (10), and a hot air outlet (11) is formed in the third heat exchange cavity (15).

2. The self-heating type hot air integrated furnace according to claim 1, characterized in that: the outer side of the second heat exchange cavity (13) is provided with a first heat exchange cavity (12), the bottom of the first heat exchange cavity (12) is provided with more than one strip-shaped air inlet (25), the upper part of the first heat exchange cavity (12) is communicated with the second heat exchange cavity (13) through an air guide plate (24), and the air guide plate (24) inclines downwards.

3. The self-heating hot air integrated furnace according to claim 2, characterized in that: an air inlet flow guide sleeve (19) is arranged on the furnace body (1), one side of the air inlet flow guide sleeve (19) is communicated with a first air inlet (10), the bottom of the air inlet flow guide sleeve (19) is communicated with a second heat exchange cavity (13), and a plurality of baffles (14) matched with the flue gas circulation pipeline (16) are arranged in the second heat exchange cavity (13).

4. The self-heating type hot air integrated furnace according to claim 3, characterized in that: a second circulating air inlet (21) communicated with the second heat exchange cavity (13) is formed in the upper portion of the third heat exchange cavity (15), a first spiral guide plate (22) in spiral arrangement is installed between the inner wall of the third heat exchange cavity (15) and the outer wall of the combustion chamber (17), and a hot air outlet (11) is formed in the lower portion of the third heat exchange cavity (15).

5. The self-heating hot air integrated furnace according to claim 4, characterized in that: a second spiral guide plate (23) which is spirally arranged is arranged in the first heat exchange cavity (12).

6. The self-heating hot air integrated furnace according to claim 1, characterized in that: the flue gas circulating pipeline (16) comprises a plurality of straight pipes and connecting bent pipes which are connected in a circulating manner, and the bottoms of the straight pipes are provided with detachable baffles (14).

7. The self-heating type hot air integrated furnace according to any one of claims 1 to 6, characterized in that: the upper end is fixed with the horizontal pole in combustion chamber (17), hangs on the horizontal pole and is equipped with filtering mechanism, and filtering mechanism includes metal filter mantle (28) and metal filters (29) that set up from top to bottom, and metal filters (29) hang at metal filter mantle (28) lower extreme through the couple, are equipped with the aperture on metal filter mantle (28).

8. The self-heating hot air integrated furnace according to claim 7, characterized in that: the metal filtering cover (28) and the metal filtering net (29) are formed by splicing a plurality of arc-shaped structures with the same structure, and a clamping plate (30) is arranged between every two adjacent arc-shaped structures on the metal filtering net (29).

9. The self-heating type hot air integrated furnace according to claim 8, characterized in that: a power mechanism (6) is arranged on one side of the furnace body (1), the power mechanism (6) is connected with a spiral feeder (7) through a chain wheel, the tail end of the spiral feeder (7) extends into a combustion chamber (17), a hopper (8) is arranged above the spiral feeder (7), and an ignition port (5) communicated with the combustion chamber (17) is formed in the furnace body (1).

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