CN103099298B - Tobacco leaf bulk curing barn smoke waste heat utilization device - Google Patents

Abstract

The invention discloses a flue gas waste heat utilization device in a dense tobacco barn, which comprises a heat exchange chamber, a smoke return chamber and a connecting chamber; the chimney is located on one side of the heat exchange chamber; The upper and lower parts are connected with the smoke return chamber through an upper metal pipe and a lower metal pipe. When the cold air passes through the upper and lower metal pipes, it is heated and becomes hot air; the side wall of the heating room is provided with an air inlet of the heating room; the hot air outlet of the heat exchange room is connected to the air inlet of the heating room of the barn through the connecting room up to direct the hot air in the heat exchange chamber into the heating chamber. The flue gas waste heat utilization device of the tobacco leaf-intensive barn of the present invention can use the waste heat of the flue gas discharged from the barn chimney to heat the air entering the barn, reduce fuel (mainly coal) consumption, reduce harmful gas emissions, and achieve tobacco leaf drying. Roasting has the advantages of energy saving, emission reduction and cost reduction. <!--1-->

Description

Waste heat utilization device for flue gas in intensive tobacco curing barn

technical field

The invention belongs to the technical field of energy saving and emission reduction, and in particular relates to a flue gas waste heat utilization device of a tobacco leaf intensive curing barn.

Background technique

my country is the country with the largest planting area of flue-cured tobacco in the world. After the tobacco leaves are mature, they need to be collected and loaded into the barn for baking, which consumes a lot of coal. Coal is burned in the furnace of the barn to produce high-temperature flue gas. The high-temperature flue gas flows through the heat exchanger to transfer heat and heat the air in the heating room to become hot air. The hot air is sent to the smoking room by the circulating fan to heat the tobacco leaves. It promotes extremely complex changes in the tobacco leaves, and finally makes the tobacco leaves turn yellow and dry; the flue gas after doing work in the heat exchanger finally enters the chimney and is discharged outside the barn. In fact, the exhausted flue gas still contains a lot of heat, and its temperature usually exceeds 120°C. In the case of some heat exchangers with reduced thermal conductivity and reduced heat transfer efficiency, the temperature of the exhausted flue gas can reach above 200°C . At present, there is no waste heat utilization measure in the intensive curing barn, and the high-temperature flue gas is discharged into the atmosphere, so that the waste heat of the flue gas in the intensive barn is wasted and not utilized, which reduces the total thermal efficiency of the barn, so the unit dry tobacco leaves The coal consumption is larger, the flue gas emission is more, and the baking cost is higher. The invention can obviously reduce the coal consumption after utilizing the waste heat of the flue gas in the curing barn, and is one of the effective ways for tobacco leaf curing to realize energy saving, emission reduction, cost reduction and income increase.

Contents of the invention

In order to avoid the disadvantages of the above-mentioned prior art, the present invention provides a waste heat utilization device for flue gas in a dense tobacco barn, which can reduce fuel consumption by utilizing the waste heat of the flue gas discharged from the chimney of the barn.

The present invention adopts the following technical solutions to solve the technical problems.

The flue gas waste heat utilization device of dense tobacco leaves barn has the following structural features: a chimney, a heat exchange room, a smoke return room, a connecting room and a smoke return room; the barn includes a tobacco loading room and a heating room; the heating room and A heat insulation wall is arranged between the smoke chambers; a roof is provided on the top of the heating chamber and the smoke chamber; a fan table for fixing the fan is provided in the heating chamber, and the fan table extends to the heating chamber. outside the heating chamber; a stove is arranged inside the heating chamber, and a heat exchanger is arranged above the stove; a circulating fan is fixedly installed on the fan plate at a position directly above the heat exchanger; The fan table is located below the roof; on the upper surface of the roof, a heat exchange chamber and a chimney are arranged above the heating chamber; the smoke outlet of the chimney is located in the heat exchange chamber the top of the roof;

The chimney is located on one side of the heat exchange chamber, the other side of the heat exchange chamber is provided with a smoke return chamber, and a smoke partition is arranged inside the chimney; The upper metal pipe is connected with the lower metal pipe; the connection port between the upper metal pipe and the chimney is located above the smoke baffle, and the connection port between the lower metal pipe and the chimney is located at the top of the smoke baffle below;

A cold air inlet of the heat exchange chamber is provided on the side wall of the heat exchange chamber near the side of the smoke chamber; The hot air outlet of the hot room; the side wall of the heating room away from the smoke loading room is provided with a heating room air inlet; on the side of the heat exchange room and the heating room away from the smoke loading room In addition to the side wall of the heat exchange chamber, there is a connection chamber covering both the hot air outlet of the heat exchange chamber and the air inlet of the heating chamber; the connection chamber is located on the upper surface of the fan table.

The structural features of the flue gas waste heat utilization device of the tobacco leaf intensive curing barn of the present invention also lie in:

The outside of the smoke return room is provided with a smoke return room insulation door.

A connection room window is arranged on the side wall of the connection room away from the smoke chamber.

On the inner wall of the wall where the cold air inlet of the heat exchange chamber is located, a plastic film covering the cold air inlet of the heat exchange chamber is provided; the upper end of the plastic film is fixed on the wall, and the lower end hangs freely.

The smoke baffle is made of refractory material.

Compared with the prior art, the beneficial effects of the present invention are reflected in:

The flue gas waste heat utilization device of the tobacco leaf intensive curing barn of the present invention uses the waste heat of the flue gas discharged from the chimney of the barn barn to heat the air entering the barn barn to increase its temperature and provide auxiliary energy for tobacco leaf roasting, thereby enabling Reduce fuel consumption, realize energy saving, emission reduction, and cost reduction in tobacco leaf curing, and correspondingly increase the economic benefits of tobacco farmers.

In the existing barn, external cold air directly enters the heating chamber of the barn. However, in the barn of the present invention, the external cold air enters the heating chamber through the connection chamber after being heated by the heat exchange chamber. Therefore, compared with the prior art, the temperature of the air entering the heating chamber is higher, which can reduce the consumption of heating fuel.

The flue gas waste heat utilization device of the tobacco leaf-intensive curing barn of the present invention can use the waste heat of the flue gas discharged from the barn chimney to heat the air entering the barn, realize energy saving and emission reduction of tobacco leaf baking, reduce costs, save fuel, and have good environmental protection performance, etc. advantage.

Description of drawings

Fig. 1 is a perspective view of the flue gas waste heat utilization device of the tobacco leaf intensive curing barn of the present invention.

Fig. 2 is a cross-sectional view of the flue gas waste heat utilization device of the tobacco leaf intensive curing barn of the present invention.

The labels in the figure are: 1 smoke chamber, 101 roof, 2 chimney, 3 heat exchange chamber, 4 heat exchange chamber top cover, 5 heat exchange chamber cold air inlet, 6 smoke partition, 7 return smoke chamber insulation door, 8 return Smoke chamber, 9 upper metal smoke pipe, 10 lower metal smoke pipe, 11 heat insulation wall, 12 hot air outlet of heat exchange room, 13 connection room, 14 air inlet of heating room, 15 window of connection room, 16 fan platen, 17 heating room , 18 fans, 19 heat exchangers, 20 stoves.

The present invention will be further described below through specific embodiments and in conjunction with the accompanying drawings.

Detailed ways

Referring to Figures 1 to 2, the flue gas waste heat utilization device in a tobacco leaf intensive curing room includes a chimney 2, a heat exchange room 3, a smoke return room 8, a connecting room 13 and a smoke return room 8; the barn includes a tobacco loading room 1 and Heating chamber 17; a heat insulating wall 11 is arranged between the heating chamber 17 and the smoke chamber 1; a roof 101 is arranged on the top of the heating chamber 17 and the smoke chamber 1; There is a fan table 16 for fixing the fan 18, and the fan table 16 extends outside the heating chamber 17; a stove 20 is arranged inside the heating chamber 17, and a heat exchanger 19 is arranged above the stove 20; On the fan table 16, a circulating fan 18 is fixed at a position directly above the heat exchanger 19; the fan table 16 is located below the roof 101; on the roof 101 On the surface, a heat exchange chamber 3 and a chimney 2 are arranged above the heating chamber 17; the smoke outlet of the chimney 2 is located above the top cover 4 of the heat exchange chamber;

The chimney 2 is located on one side of the heat exchange chamber 3, the other side of the heat exchange chamber 3 is provided with a smoke return chamber 8, and the chimney 2 is provided with a smoke partition 6; the chimney 2 and the The smoke chamber 8 is connected by an upper metal pipe 9 and a lower metal pipe 10; the connection port between the upper metal pipe 9 and the chimney 2 is located above the smoke baffle plate 6, and the lower metal pipe 10 The connection port with the chimney 2 is located below the smoke baffle 6;

A heat exchange chamber cold air inlet 5 is provided on the side wall of the heat exchange chamber 3 near the side of the smoke chamber 1; The heat exchange chamber hot air outlet 12 is arranged on the wall; the heating chamber air inlet 14 is arranged on the side wall of the heating chamber 17 away from the side wall of the smoke chamber 1; between the heat exchange chamber 3 and the heating chamber 17, the side wall away from the side wall of the smoke chamber 1 is provided with a connecting chamber 13 that simultaneously covers the heat exchange chamber hot air outlet 12 of the heat exchange chamber 3 and the heating chamber air inlet 14; The connection chamber 13 is located on the upper surface of the fan platform 16 .

The present invention extends the chimney 2 of the dense barn into the heat exchange chamber 4 through the lower metal pipe 10, the smoke return chamber 8 and the upper metal pipe 9, and uses high-temperature flue gas to heat the air in the heat exchange chamber; The heated air is introduced into the barn to assist heating, so as to reduce the amount of coal used for tobacco leaf curing. Barn comprises smoke chamber 1 and heating chamber 17.

When building the chimney 2 on the roof 1 of the dense barn, leave an opening at the lower part of the wall on one side of the chimney 2, and build a small space for returning smoke, that is, a smoke return chamber 8, on the other side of the roof 1 directly opposite the opening. Insert one end of a thicker metal pipe 10 into the lower part of the opening of the chimney 2, insert it through the wall to the flue, and insert the other end into the lower part of the smoke return chamber 8, insert it through the wall just to enter the smoke return chamber 8 The flue of the chimney 2 is horizontally sealed along the lower metal pipe 10 with a refractory material smoke separator 6; another end of the upper metal pipe 9 is inserted into the upper part of the opening of the side wall of the chimney, and the other end is inserted into the smoke return chamber 8 The upper part constitutes the flue gas circuit, and the flue gas passes through the lower metal pipe, the smoke return chamber, and the upper metal pipe in turn, and is discharged from the smoke outlet of the chimney. The upper and lower metal pipes are heated by the flue gas to dissipate heat, and the cold air in the heat exchange chamber is heated and then sent to the heating chamber. As shown in Figure 2, the arrows indicate the flow direction of the flue gas.

The high-temperature flue gas produced by fuel combustion in the heating chamber enters the lower part of the chimney after being exchanged by the heat exchanger; then moves upward, passes through the lower metal pipe, the smoke return chamber, and the upper metal pipe in turn, and then is discharged from the smoke outlet of the chimney. The smoke chamber and the heating chamber are connected through the air inlet below the heat insulation wall and the return air above the heat insulation wall. Tobacco leaves in the smoking chamber are cured.

Seal the chimney wall connected to the metal pipe and the wall of the smoke return chamber; set a freely openable and openable heat return door 7 of the smoke return room on the wall facing the outside of the smoke return room 8, and open it if necessary to remove the dust accumulated in the metal pipe , to ensure the heat transfer efficiency of the metal tube. Build the heat exchange chamber 4 above the top of the heating chamber 17 at last, and surround the chimney bottom, the upper and lower metal pipes and the smoke return chamber 8 inside. A hot air outlet 12 of the heat exchange chamber is set on the wall above the heat exchange chamber 3 above the air inlet 14 of the heating chamber; The heating chamber air inlet 14 is surrounded inside to ensure that the hot air coming out from the heat exchange chamber 3 can only enter the baking room to play a role. On the enclosure wall facing the heating chamber air inlet 14 in the connecting chamber 13, a connecting chamber window 15 that can be switched is established, so that the heating chamber air inlet control door is overhauled.

Because the smoke partition 6 is set inside the chimney, during the tobacco leaf curing process, the flue gas with a higher temperature in the lower part of the chimney 2 can only enter the lower metal pipe 10 and flow to the return chamber 8, and then flow back into the chimney through the upper metal pipe 9 The upper part is finally discharged from the upper mouth of the chimney; during this process, the flue gas heats the metal pipe, and the metal pipe heats the air in the heat exchange chamber 3; the hot air in the heat exchange chamber 3 enters the heating chamber 17 through the connecting chamber 13 for auxiliary supply heat, thereby reducing fuel consumption and achieving the purpose of energy saving, emission reduction and cost reduction.

The outside of the smoke return chamber 8 is provided with a smoke return chamber insulation door 7 . The thermal insulation door of the smoke return room is a sealed door, which can be opened at any time to remove the dust accumulated in the smoke return room and the two metal pipes, so as not to block the smoke outlet channel and improve the heat exchange efficiency of the metal pipes.

A connection room window 15 is arranged on the side wall of the connection room 13 away from the smoke chamber 1 . Through the window of the connection room, the air inlet of the heating room can be maintained.

On the inner wall of the wall where the cold air inlet 5 of the heat exchange chamber of the heat exchange chamber 3 is located, a plastic film covering the cold air inlet 5 of the heat exchange chamber is provided; the upper end of the plastic film is fixed on the wall, and the lower end Free droop.

Two cold air inlets 5 are provided on the wall near the side of the smoke chamber 1 in the heat exchange chamber 3, and several layers of folded plastic are horizontally fixed with wooden strips on the upper wall on the side of each cold air inlet 5. Film, the four sides of the film are appropriately larger than the cold air inlet 5, the upper end of the film is fixed and the lower end hangs freely to cover the air inlet, which not only prevents the heat from being lost in the heat exchange chamber, but also can be opened freely according to the needs of the tobacco leaf curing process The size and the right amount of air intake.

The smoke partition 6 is made of refractory material.

When building the chimney 2 on the roof 1 of the densely packed barn house, an opening is left at the bottom of the right side wall of the chimney, and a return smoke chamber 8 is built on the other side of the roof directly opposite the opening. The thickness of the chimney and smoke return chamber wall is 13cm, and it is built with standard bricks, and both sides are tightly painted with cement mortar. The empty specification of the smoke return room is 24cm in length, 24cm in width and 56cm in height. Insert one end of a weather-resistant steel pipe 10 with an outer diameter of 18 cm and a pipe wall thickness of 4 mm into the lower part of the opening of the chimney 2 at a height of 10 cm from the roof of the barn. The lower part is 10cm away from the roof of the roasting house, and it can be inserted through the left wall just to enter the smoke recovery room. The flue of chimney 2 is horizontally sealed along lower metal pipe 10 with the refractory material smoke barrier 6 with a thickness of 8 cm; then another end of weather-resistant steel pipe 9 with an outer diameter of 18 cm and a pipe wall thickness of 4 mm is inserted into the right side of chimney 2 The upper part of the opening of the wall, and the other end is inserted into the upper part of the left wall of the smoke return chamber 8 to form a flue gas circuit; two metal pipes are arranged up and down, and the distance between them is 10cm. Seal the chimney wall and return chamber wall where the metal pipes are connected. On the outer right wall of the smoke return room 8, there is a smoke return room insulation door 7 that can be opened and closed freely. The threshold is 6 cm high, the door is 56 cm high, 32 cm wide, and 6 cm thick; It is made of cotton sandwich color steel plate; the thermal insulation door 7 of the smoke return room is only opened when the dust accumulation inside and outside the metal pipe is removed, and it is usually closed tightly. Build the heat exchange chamber 3 above the top of the heating chamber 17, and surround the chimney bottom, two metal pipes and the smoke return chamber 8 inside. The thickness of the heat exchange room wall is 20cm, which is built with standard bricks, and both sides are tightly painted with cement mortar; the top is a reinforced concrete member with a thickness of 10cm. The empty specification of the heat exchange chamber is 180cm in length, 220cm in width and 70cm in height. Open 2 cold air inlets 5 on the wall above the thermal insulation wall 11 in the heat exchange chamber 3, the headroom specifications are all high 40cm, wide 50cm, 2 apart from each other by 80cm, and the bottom edge is 20cm from the roof of the grill; 2～3 layers of folded plastic films are horizontally fixed with wooden strips on the top wall of one side of the air inlet 5, and the four sides of the film sheet are larger than the cold air inlet 510cm, freely sagging to cover the air inlet 5, both to block the heat in the heat exchange chamber The effect of external loss can be freely opened according to the needs of the tobacco leaf curing process and an appropriate amount of air can be taken in; a heat exchange chamber hot air outlet 12 is set in the center of the heat exchange chamber 3 on the wall above the heating chamber air inlet 14, and the specification is high. 40cm, 90cm wide, and the lower edge is 10cm away from the top surface of the barn; then build a connection chamber 13 on the top plate of the circulating fan 16, and surround the heat exchange chamber 3 hot air outlet 12 of the heat exchange chamber and the air inlet 14 of the heating chamber; The wall of room 13 is 20cm thick, built with standard bricks, both sides are tightly painted with cement mortar, and the roof is reinforced concrete members, 10cm thick; the specification of the connecting room is 40cm long, 120cm wide, and 150cm high. Establish a connection room window 15 that can be switched on the enclosure wall facing the heating chamber air inlet 14 in the connection room 13, the specification is high 80cm, wide 90cm, wooden door is installed, and the door panel is thick 4cm.

Utilizing the barn of the device of the present invention, the effect of energy saving, emission reduction and cost reduction is obvious. The results of multiple tests show that the average coal consumption and average electricity consumption per 1kg of dried tobacco leaves are 1.531kg (local raw coal, the same below) and 0.593kWh respectively for the intensive curing barns installed with this type, while those without centralized The control dense barn of the heater is 1.712kg and 0.615 kWh respectively. Compared with the latter, the former saves 0.181kg/kg of coal (dry smoke), and the coal saving rate is 10.60%; correspondingly, the waste gas emission is reduced by 10.60%; the power saving is 0.022 kWh/kg (dry smoke), and the power saving rate is 3.577%; The cost of baking is saved by 0.158 yuan/kg (dry tobacco) (calculated based on the local coal price of 800 yuan/t and electricity price of 0.60 yuan/kWh in 2012), and the saving rate is 9.088%.

The device of the invention has low manufacturing cost, long service life and convenient use. Both the heat collection chamber and the surrounding structure of the connecting chamber are made of cheap materials, and the service life is expected to be more than 10 years. During the tobacco leaf curing process of this type, the intensive curing room can automatically absorb the hot air in the heat collecting chamber, and does not need to be operated by baking personnel, and will not increase the workload.

Claims (3)

1. tobacco-leaf bulk curing barn flue gas waste heat utilization device, is characterized in that, comprises chimney (2), Heat Room (3), junction chamber (13) and returns smoke-box (8); Described barn comprises cigarette-filling house (1) and heating clamber (17); Insulated wall (11) is provided with between described heating hot cell (17) and cigarette-filling house (1); The top of described heating clamber (17) and described cigarette-filling house (1) is provided with roof (101); Be provided with the blower fan platen (16) for fixing blower fan (18) in described heating clamber (17), described blower fan platen (16) extends to outside heating clamber (17); Be provided with stove (20) within described heating clamber (17), described stove (20) top is provided with heat exchanger (19); On described blower fan platen (16), be fixed with blower fan (18) being positioned at the position directly over described heat exchanger (19); Described blower fan platen (16) is positioned at the below of described roof (101); On the upper surface of described roof (101), be provided with Heat Room (3) and chimney (2) in the top of described heating clamber (17); The outlet flue of described chimney (2) is positioned at the top of described Heat Room top cover (4);

Described chimney (2) is positioned at the side of described Heat Room (3), and the opposite side of described Heat Room (3) is provided with back smoke-box (8), is provided with smoke baffle plate (6) in described chimney (2); Be connected with lower metal tube (10) by upper metal tube (9) between described chimney (2) with described time smoke-box (8); Described upper metal tube (9) is positioned at the top of described smoke baffle plate (6) with the connector of described chimney (2), and described lower metal tube (10) is positioned at the below of described smoke baffle plate (6) with the connector of described chimney (2);

The side wall of the side of the close described cigarette-filling house (1) of described Heat Room (3) is provided with Heat Room cold wind import (5); The side wall away from described cigarette-filling house (1) side of described Heat Room (3) is provided with Heat Room hot-blast outlet (12); The side wall away from described cigarette-filling house (1) side of described heating clamber (17) is provided with heating clamber air inlet (14); Outside the side wall of the side away from described cigarette-filling house (1) of described Heat Room (3) and described heating clamber (17), be provided with and cover the Heat Room hot-blast outlet (12) of described Heat Room (3) and the junction chamber (13) of described heating clamber air inlet (14) simultaneously; Described junction chamber (13) is positioned on the upper surface of described blower fan platen (16);

The high-temperature flue gas that heating clamber stove fuel combustion produces, after heat exchanger heat exchange, enters chimney bottom; Then move upward, successively by discharging from the outlet flue of chimney after lower metal tube, time smoke-box, upper metal tube;

The outside of described time smoke-box (8) offers back smoke-box thermal insulating door thermally insulated door (7);

Described smoke baffle plate (6) is made up of refractory material.

2. tobacco-leaf bulk curing barn flue gas waste heat utilization device according to claim 1, is characterized in that, the side wall of the side away from described cigarette-filling house (1) of junction chamber (13) is provided with junction chamber window (15).

3. tobacco-leaf bulk curing barn flue gas waste heat utilization device according to claim 1, it is characterized in that, on the inwall of the wall at Heat Room cold wind import (5) place of Heat Room (3), be provided with the plastic sheeting be covered on described Heat Room cold wind import (5); The upper end of described plastic sheeting is fixed on metope, and lower end is freely sagging.