CN211316995U - Lime kiln flue gas waste heat recovery device - Google Patents

Abstract

The utility model relates to a lime kiln flue gas waste heat recovery device, which belongs to the field of waste heat recovery devices, and comprises a lime kiln body with a PLC control system, and also comprises a heat exchanger, a cyclone dust collector, a variable frequency speed regulation draught fan, an external carbon material drying furnace and a bag-type dust collector which are sequentially connected through pipelines; the outlet end of the exhaust gas main pipe is connected with the air inlet end of the heat exchanger through a first pipeline; a bypass pipe is arranged between the first pipeline and the exhaust gas main pipe; an electric cut-off valve is arranged at the air inlet pipe of the carbon drying furnace outside the electric cut-off valve on the bypass pipe; the pipeline that variable frequency speed governing draught fan and outside charcoal material drying furnace are connected is provided with mass flow meter, electronic regulation butterfly valve, pressure gauge and hard seal hair moves butterfly valve temperature measuring resistor in proper order. The use of fuel is reduced, the utilization rate of the fuel is improved, the cost is reduced, the production and operation cost is saved, the influence on the surrounding environment is reduced, and the environmental protection benefit can be obtained.

Description

Lime kiln flue gas waste heat recovery device

Technical Field

The utility model relates to a waste heat recovery device field, more specifically relates to a lime kiln flue gas waste heat recovery device.

Background

The lime kiln is used as a main process device in industries such as steel, metallurgy and calcium carbide, but the utilization of tail gas waste heat generated in the production process of the lime kiln is always in a stagnation state, so that huge energy waste is caused.

The tail gas of the existing sleeve lime kiln is used as a heat source, a large amount of waste heat contained in the high-temperature flue gas brought out from a flue is not utilized, and the high-temperature flue gas is directly discharged into the atmospheric environment through a desulfurization dust remover, so that not only is the energy greatly wasted, but also a large amount of heat directly enters the atmospheric environment; if the heat in the flue gas can be reused, the use of fuel can be reduced, the utilization rate of the fuel is improved, the cost is reduced, and meanwhile, the influence on the surrounding environment can be reduced.

Therefore, effective solutions to solve the above problems need to be proposed.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model discloses a lime kiln flue gas waste heat recovery device, there is very big waste on the energy in the solution technique, a large amount of heat directly get into the problem of atmospheric environment simultaneously.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a lime kiln flue gas waste heat recovery device, which comprises a lime kiln body with a PLC control system, wherein a hearth is arranged in the lime kiln body, and a waste gas header pipe for discharging high-temperature flue gas is arranged on the hearth;

the device also comprises a heat exchanger, a cyclone dust collector, a variable-frequency speed-regulating induced draft fan, an external carbon material drying furnace and a bag-type dust collector which are sequentially connected through pipelines;

the outlet end of the exhaust gas main pipe is connected with the air inlet end of the heat exchanger through a first pipeline;

a bypass pipe is arranged between the first pipeline and the exhaust gas main pipe; an electric cut-off valve is arranged on the bypass pipe;

the electric cut-off valve is arranged at the air inlet pipe of the external carbon drying furnace;

a mass flow meter, an electric adjusting butterfly valve, a pressure gauge and a hard sealing capillary butterfly valve temperature measuring resistor are sequentially arranged on a pipeline connecting the variable-frequency speed-regulating induced draft fan and the external carbon drying furnace;

the electric cut-off valve, mass flow meter, the electric adjusting butterfly valve, the pressure gauge and the hard seal capillary butterfly valve temperature measuring resistor are all connected with the PLC control system electricity.

As a further improvement of the technical scheme, a manual cut-off butterfly valve is arranged on a pipeline connecting the variable-frequency speed-regulating draught fan and the external carbon drying furnace;

and the variable-frequency speed-regulating draught fan is electrically connected with the PLC control system.

As a further improvement of the technical scheme, a dust removal fan is arranged at the outlet end of the bag-type dust remover.

As a further improvement of the technical scheme, the air outlet end of the dust removal fan is connected with a sulfur removal device.

The utility model has the advantages that:

the utility model discloses a lime kiln flue gas waste heat recovery device through the use that not only can reduce fuel to lime kiln body gas waste heat, improves the utilization ratio of fuel, and reduce cost practices thrift the production working costs, can also reduce the influence to the surrounding environment and can also receive the environmental protection benefit simultaneously.

Drawings

Fig. 1 is a schematic structural diagram of a lime kiln flue gas waste heat recovery device provided by the specific embodiment of the present invention.

In the figure:

1. a lime kiln body; 2. an exhaust gas main pipe; 3. a heat exchanger; 4. a cyclone dust collector; 5. a variable-frequency speed-regulating draught fan; 6. an external charcoal drying oven; 7. a bag-type dust collector; 8. a first pipeline; 9. a bypass pipe; 10. an electric shut-off valve; 11. a mass flow meter; 12. an electric adjusting butterfly valve; 13. a pressure gauge; 14. a temperature measuring resistor of the hard seal gross-motion butterfly valve; 15. manually cutting off the butterfly valve; 16. a dust removal fan; 17. a sulfur removal device.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a lime kiln flue gas waste heat recovery device provided by an embodiment of the present invention, as shown in fig. 1. The utility model provides a lime kiln flue gas waste heat recovery device, which comprises a lime kiln body 1 with a PLC control system, wherein a hearth is arranged in the lime kiln body 1, and a waste gas header pipe 2 for discharging high-temperature flue gas is arranged on the hearth;

the device also comprises a heat exchanger 3, a cyclone dust collector 4, a variable-frequency speed-regulating draught fan 5, an external carbon material drying furnace 6 and a bag-type dust collector 7 which are sequentially connected through pipelines;

the outlet end of the exhaust gas main pipe 2 is connected with the air inlet end of the heat exchanger 3 through a first pipeline 8;

a bypass pipe 9 is arranged between the first pipeline 8 and the exhaust gas main pipe 2; an electric cut-off valve 10 is arranged on the bypass pipe 9;

an electric cut-off valve 10 is arranged at the air inlet pipe of the external carbon drying furnace 6;

a pipeline connecting the variable-frequency speed-regulating draught fan 5 and the external charcoal drying furnace 6 is sequentially provided with a mass flow meter 11, an electric regulating butterfly valve 12, a pressure gauge 13 and a hard sealing capillary butterfly valve temperature measuring resistor 14;

the electric cut-off valve 10, the mass flow meter 11, the electric adjusting butterfly valve 12, the pressure gauge 13 and the hard sealing capillary butterfly valve temperature measuring resistor 14 are all electrically connected with the PLC control system.

In the above implementation, specifically, the high-temperature flue gas in the furnace chamber is led out from the waste gas outlet of the heat exchanger 3, directly led to the inlet air pipe of the external carbon drying furnace 6 through the cyclone dust collector 4 and the variable-frequency speed-regulating draught fan 5, and butted with the inlet air pipe, and the air inlet pipe of the external carbon drying furnace 6 is provided with the electric cutoff valve 10; a bypass pipe 9 is arranged between the first pipeline 8 and the exhaust gas main pipe 2; an electric cut-off valve 10 is arranged on the bypass pipe 9; specifically, when the mass flow meter 11, the electric adjusting butterfly valve 12, the pressure gauge 13 and the hard sealing capillary butterfly valve temperature measuring resistor 14 detect the flow, the pressure and the temperature of the flue gas entering the external carbon drying furnace 6, the flow, the pressure and the temperature of the flue gas entering the external carbon drying furnace can be automatically adjusted through the PLC control system. When the external charcoal material drying furnace 6 does not need high-temperature flue gas, an electric cut-off valve 10 on a pipeline leading to the external charcoal material drying furnace 6 is closed, at the moment, an electric cut-off valve 10 is arranged on a bypass pipe 9 and is opened, and the part of high-temperature gas enters an exhaust gas header pipe 2 of a lime kiln body 1 according to the original process; the air in the hearth is heated through heat exchange, oxygen is increased for combustion supporting, the furnace temperature can be rapidly increased, and the energy-saving effect is obvious. The waste heat of the high-temperature flue gas exhausted from the flue can be not recycled; when the mass flow meter 11, the electric adjusting butterfly valve 12, the pressure gauge 13 and the hard sealing capillary butterfly valve temperature measuring resistor 14 detect that the flow, pressure and temperature of the flue gas entering the external carbon drying furnace 6 are low, when the external carbon drying furnace 6 needs high-temperature flue gas, the waste gas collecting pipe leading to the lime kiln body 1 is closed by arranging the electric cut-off valve 10 on the bypass pipe 9, the electric cut-off valve 10 on the pipeline leading to the external carbon drying furnace 6 is opened, and the flue gas is conveyed to the external carbon drying furnace 6 by the variable-frequency speed-regulating draught fan 5; the smoke entering the external carbon drying furnace 6 is finally filtered by the bag-type dust collector 7 to remove fine smoke in the smoke, so that the content of the smoke is reduced to the minimum.

Therefore, the utilization of the waste heat of the lime kiln body 1 gas can reduce the use of fuel, improve the utilization rate of the fuel, reduce the cost, save the production and operation cost, reduce the influence on the surrounding environment and achieve the environmental protection benefit.

Preferably, a manual cut-off butterfly valve 15 is arranged on a pipeline connecting the variable-frequency speed-regulating draught fan 5 and the external charcoal material drying furnace 6;

and the variable-frequency speed-regulating draught fan 5 is electrically connected with the PLC control system.

Particularly, through setting up manual butterfly valve 15 that cuts off for when preventing the high temperature fan of lime kiln furnace body 1 from shutting down, prevent the gas of exhaust gas house steward 2 and fall variable frequency speed governing draught fan 5, secondly, variable frequency speed governing draught fan 5 and PLC control system electric connection, variable frequency speed governing draught fan 5 realizes variable frequency speed through PLC control system, ensure that the operation of lime kiln furnace body 1 is not influenced, can adjust the flue gas volume of sending to outside charcoal material drying furnace 6 according to the operation conditions of lime kiln furnace body 1.

Preferably, the outlet end of the bag-type dust collector 7 is provided with a dust-removing fan 16. The dust removal fan 16 is matched with the bag-type dust remover 7 for use, so that the air speed in the pipeline can meet the requirement, the pipeline blockage can be avoided, the normal stability of the bag-type dust remover 7 can be effectively ensured, and the dust removal efficiency can be ensured.

Preferably, the air outlet end of the dust removing fan 16 is connected with a sulfur removal device 17.

Particularly, the desulfurizing device 17 filters the fine smoke dust in the smoke by the bag-type dust collector 7, so that the content of the smoke dust is reduced to the minimum, and sulfur in the smoke is taken out by the desulfurizing device 17 to prevent sulfur pollution.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. The present invention is not to be limited by the specific embodiments disclosed herein, and other embodiments that fall within the scope of the claims of the present application are intended to be within the scope of the present invention.

Claims (4)

1. A lime kiln flue gas waste heat recovery device comprises a lime kiln body (1) with a PLC control system, wherein a hearth is arranged in the lime kiln body (1), and a waste gas main pipe (2) for discharging high-temperature flue gas is arranged on the hearth; the method is characterized in that:

the device also comprises a heat exchanger (3), a cyclone dust collector (4), a variable-frequency speed-regulating draught fan (5), an external carbon material drying furnace (6) and a bag-type dust collector (7) which are sequentially connected through pipelines;

the outlet end of the exhaust gas main pipe (2) is connected with the air inlet end of the heat exchanger (3) through a first pipeline (8);

a bypass pipe (9) is arranged between the first pipeline (8) and the exhaust gas main pipe (2); an electric cut-off valve (10) is arranged on the bypass pipe (9);

the electric cut-off valve (10) is arranged at the air inlet pipe of the external carbon drying furnace (6);

a pipeline connecting the variable-frequency speed-regulating draught fan (5) and the external charcoal drying furnace (6) is sequentially provided with a mass flow meter (11), an electric regulating butterfly valve (12), a pressure gauge (13) and a hard-sealing capillary butterfly valve temperature measuring resistor (14);

the electric cut-off valve (10), the mass flow meter (11), the electric adjusting butterfly valve (12), the pressure gauge (13) and the hard sealing capillary butterfly valve temperature measuring resistor (14) are all electrically connected with the PLC control system.

2. The lime kiln flue gas waste heat recovery device as claimed in claim 1, wherein:

a manual cut-off butterfly valve (15) is arranged on a pipeline connecting the variable-frequency speed-regulating draught fan (5) and the external carbon drying furnace (6);

and the variable-frequency speed-regulating draught fan (5) is electrically connected with the PLC control system.

3. The lime kiln flue gas waste heat recovery device as claimed in claim 1, wherein:

and a dust removal fan (16) is arranged at the outlet end of the bag-type dust collector (7).

4. The lime kiln flue gas waste heat recovery device as claimed in claim 3, wherein:

and the air outlet end of the dust removal fan (16) is connected with a sulfur removal device (17).

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