Coke drying system for blast furnace

Abstract

The utility model relates to a coke drying system for a blast furnace. The smoke exhaust pipeline is communicated with the hot blast stove heat exchanger; the high-temperature induced draft fan is arranged on the smoke exhaust pipeline; the coke bin is arranged at the downstream of the high-temperature induced draft fan and is communicated with the smoke exhaust pipeline; high-temperature smoke in the smoke exhaust pipeline is sucked into the coke bin through the high-temperature induced draft fan, and then coke in the coke bin is dried and dehumidified. By means of the adsorbability of the coke, some components in the rich waste heat flue gas are absorbed and prevented from flowing into the atmosphere to pollute the atmospheric environment. The device is simple in structure and high in operability.

Description

TECHNICAL FIELD

[0001] The utility model relates to blast furnace ironmaking technical field, especially a coke drying system for blast furnace. BACKGROUND

[0002] The raw materials such as coke and ore for blast furnace are usually shipped to the wharf by waterway, and then transported to the blast furnace and sintering place by the stacker-reclaimer and pipe belt machine of the wharf. In order to avoid dust pollution when the purchased coke is unloaded, water is usually sprayed into the coke, which leads to the increase of water content in the coke. Moreover, some blast furnace smelting places are located in areas with more rainfall, and the coke is usually stacked in the open air, and the pipe belt machine is used for long-distance transportation outdoors, which further increases the water content of the coke.

[0003] After the water content of the coke increases, it is easy to cause the increase of the coke consumption of the blast furnace and the increase of the coke ratio. When the top temperature of the blast furnace is lower than 100 DEG C, it is easy to cause the difficulty of ash unloading of the bag-type dust collector, the serious bag blocking and the frequent replacement, and the monthly consumption is huge. The TRT cannot generate electricity when the temperature is lower than 120 DEG C. Moreover, the water content of the clean gas pipeline also increases, which accelerates the corrosion speed of the pipeline. SUMMARY

[0004] The utility model aims at providing a coke drying system for blast furnace, which solves the problem of dehumidification and drying of coke before use in the prior art.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme that:

[0006] The utility model provides a coke drying system for blast furnace, which comprises a hot blast stove heat exchanger.

[0007] An exhaust gas pipeline is in communication with the hot blast stove heat exchanger.

[0008] A high-temperature induced draft fan is arranged on the exhaust gas pipeline.

[0009] A coke bin is arranged downstream of the high-temperature induced draft fan and in communication with the exhaust gas pipeline.

[0010] The high-temperature induced draft fan is used to draw the high-temperature flue gas in the exhaust gas pipeline into the coke bin, so as to dry and dehumidify the coke in the coke bin.

[0011] A first manual butterfly valve, a first flowmeter and a first regulating valve are arranged in sequence on the exhaust gas pipeline upstream of the connection point of the high-temperature induced draft fan along the flow direction of the high-temperature flue gas.

[0012] The first manual butterfly valve is used for controlling the high-temperature flue gas on-off of the flue gas duct; the first flow meter is used for adjusting the high-temperature flue gas flow size on the flue gas duct; and the first regulating valve is used for controlling the high-temperature flue gas flow size into the high-temperature induced draft fan.

[0013] Further, the coke bin is provided with a plurality of.

[0014] Further, the coke bin is provided with an air inlet, and the air inlet is communicated with an air inlet duct, and the air inlet duct is communicated with the flue gas duct.

[0015] Further, the air inlet duct is provided with a second regulating valve and a second flow meter, the second regulating valve is used for adjusting the flue gas flow size drawn into the coke bin, and the second flow meter is used for monitoring the flue gas flow size into the coke bin.

[0016] Further, the air inlet duct is provided with a plurality of second manual butterfly valves in parallel for controlling the flue gas on-off into the coke bin.

[0017] Further, the coke bin is provided with an air outlet, and the air outlet is communicated with an air outlet duct.

[0018] Further, the air outlet duct is provided with an induced draft axial flow fan and a temperature sensing thermocouple; the induced draft axial flow fan is used for exhausting air in the coke bin, and the temperature sensing thermocouple is used for monitoring the exhaust flue gas temperature on the air outlet duct.

[0019] Due to the above technical scheme, the utility model has the following advantages compared with the prior art:

[0020] The coke drying system for blast furnace of the utility model, by the help of high-temperature induced draft fan, the flue gas with rich waste heat in the heat exchanger of hot blast stove is introduced into the coke bin from the flue gas duct, and then the coke in the coke bin is dried and dehumidified. With the help of rich flue gas waste heat, the coke can keep dry before entering the blast furnace, avoiding the situation that the subsequent production is affected by the water content of the coke.

[0021] In addition, by arranging the first manual butterfly valve, the first flow meter and the first regulating valve on the flue gas duct, the high-temperature flue gas state on the flue gas duct is monitored, so as to adapt to different working conditions and improve the overall adaptability of the system. BRIEF DESCRIPTION OF DRAWINGS

[0022] Some specific embodiments of the utility model will be described in detail hereinafter with reference to the drawings in an exemplary but not restrictive manner. The same reference signs in the drawings indicate the same or similar components or parts. Those skilled in the art should understand that the drawings are not necessarily drawn to scale. In the drawings:

[0023] Figure 1 is a structural schematic diagram of a coke drying system for blast furnace provided by the utility model;

[0024] Figure 2 is a control diagram of a coke drying system for blast furnace provided by the utility model;

[0025] Among them, the sign explanation is as follows:

[0026] 1, hot blast furnace heat exchanger;2, exhaust pipe;3, high temperature induced draft fan;4, coke bin;401, air inlet;402, ventilation opening;5, first manual butterfly valve;6, first flowmeter;7, first regulating valve;8, air inlet pipe;9, second regulating valve;10, second flowmeter;11, second manual butterfly valve;12, ventilation pipe;13, induced draft axial flow fan;14, temperature sensing thermocouple. Specific implementation

[0027] The technical scheme of the utility model will be described clearly and completely below in combination with the drawings, obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the scope of protection of the utility model.

[0028] Reference Figure 1 , a coke drying system for blast furnace provided by the utility model includes hot blast furnace heat exchanger 1, exhaust pipe 2, high temperature induced draft fan 3 and coke bin 4.

[0029] Generally speaking, hot blast furnace heat exchanger 1 is usually connected with hot blast furnace chimney through corresponding pipe, and then the waste heat flue gas in hot blast furnace heat exchanger is discharged through chimney. Thus, on the one hand, a large amount of heat and recyclable chemical components in waste heat flue gas cannot be reasonably utilized, on the other hand, directly discharging waste heat flue gas to the atmosphere will cause some impurities in waste heat flue gas to pollute the atmospheric environment.

[0030] In the utility model, on the one hand, in order to ensure the dryness of coke for blast furnace before entering blast furnace sintering, on the other hand, the waste heat flue gas in hot blast furnace can be reasonably utilized and discharged, so in the embodiment of the utility model, the aforementioned hot blast furnace heat exchanger 1 is communicated with the aforementioned exhaust pipe 2, the aforementioned high temperature induced draft fan 3 is simultaneously arranged on the exhaust pipe 2, and the exhaust pipe 2 is communicated to the coke bin 4 arranged downstream of the high temperature induced draft fan 3. The high temperature waste heat flue gas in hot blast furnace heat exchanger 1 is extracted to the coke bin 4 from the exhaust pipe 2 under the action of the high temperature induced draft fan 3, and then the coke in the coke bin 4 is dried and dehumidified, ensuring the dryness of the coke before use.

[0031] In addition, since the coke itself is a porous material formed by dry distillation of coal under high temperature conditions, it has good adsorption performance. The waste heat flue gas in the hot blast heater heat exchanger 1 may contain some harmful gases and impurities, such as water vapor, carbon dioxide, sulfides, etc. By using coke, these pollutants can be effectively adsorbed to reduce their impact on the environment after being discharged.

[0032] For the above high-temperature induced draft fan 3, the flow rate of the induced draft fan used in the embodiment of the utility model is 90000m³ / h, and the exhaust pressure is 8000Pa, which aims to pressurize the high-temperature waste heat flue gas into the coke bin 4. In addition, since the high-temperature induced draft fan 3 receives high-temperature flue gas in the exhaust pipe 2, there must be corresponding thermal expansion in the pipe, which in turn shortens the service life of the pipe. In view of this problem, corrugated compensators are arranged before and after the aforementioned high-temperature induced draft fan 3 in the embodiment of the utility model, which are used to compensate the thermal displacement in the aforementioned exhaust pipe 2, mechanical deformation and absorb various mechanical vibrations, reduce the deformation stress of the pipe, and prolong the service life of the pipe.

[0033] For the above coke bin 4, a plurality of coke bins are connected in parallel and connected with the exhaust pipe 2 in the embodiment of the utility model. When specifically arranged, the number of coke bins 4 can be adaptively adjusted according to production requirements.

[0034] In the embodiment of the utility model, a first manual butterfly valve 5, a first flowmeter 6 and a first regulating valve 7 are arranged upstream of the connection point of the aforementioned exhaust pipe 2 and high-temperature induced draft fan 3. Moreover, the arrangement sequence of the aforementioned first manual butterfly valve 5, first flowmeter 6 and first regulating valve 7 is sequentially arranged along the flow direction of the high-temperature waste heat flue gas.

[0035] Specifically, the first manual butterfly valve 5 is arranged in the embodiment of the utility model to control the on-off of the high-temperature waste heat flue gas on the exhaust pipe 2; the first flowmeter 6 is arranged to monitor the flow rate of the high-temperature flue gas on the exhaust pipe 2; and the first regulating valve 7 is arranged to adjust the flow rate of the high-temperature flue gas entering the aforementioned high-temperature induced draft fan 3.

[0036] In the embodiment of the utility model, in order to introduce the high-temperature waste heat flue gas into the coke bin 4, an air inlet 401 is formed on the coke bin 4, and an air inlet pipe 8 is communicated at the air inlet 401, and the air inlet pipe 8 is communicated with the aforementioned exhaust pipe 2.

[0037] For the foregoing air inlet pipe 8, the second regulating valve 9 is arranged on the air inlet pipe 8, and the second regulating valve 9 is used for adjusting the flue gas flow size of the coke bin 4. In addition, the air inlet pipe 8 is also provided with a plurality of second manual butterfly valves 11 in parallel for controlling the on-off of the flue gas in the coke bin 4. The purpose of arranging a plurality of second manual butterfly valves 11 is to avoid the failure or damage of the second manual butterfly valve 11 on the air inlet pipe 8, and other second manual butterfly valves 11 can be used for replacement.

[0038] Unlike the first flow meter 6 arranged before the first regulating valve 7 on the foregoing exhaust pipe 2, the second flow meter 10 is arranged after the second regulating valve 9. The flow meter is arranged after the regulating valve, and the actual flue gas flow after the regulating valve is measured, so that the flue gas flow entering the coke bin 4 is appropriate.

[0039] In addition, in the embodiment of the utility model, the ventilation opening 402 is also arranged on the coke bin 4, and the ventilation pipe 12 is arranged at the ventilation opening 402. Synchronously, for the ventilation pipe 12, the induced draft axial flow fan 13 and the temperature sensing thermocouple 14 are arranged on the ventilation pipe 12. The induced draft axial flow fan 13 is arranged to discharge the air outwardly from the coke bin 4, so that the temperature of the flue gas in the coke bin 4 is not too high, and the coke is not dried too much to form dust and discharge outside the bin, polluting the atmospheric environment. The temperature sensing thermocouple 14 is arranged to monitor the temperature of the exhaust flue gas on the ventilation pipe 12.

[0040] In addition, in the embodiment of the utility model, referring to Figure 2 , the first flow meter 6, the first regulating valve 7, the high-temperature induced draft fan 3, the second regulating valve 9, the second flow meter 10, the induced draft axial flow fan 13 and the temperature sensing thermocouple 14 are connected with a main controller in the system. The output end of the main controller is connected with the input end of the first regulating valve 7, the high-temperature induced draft fan 3, the second regulating valve 9 and the induced draft axial flow fan 13. The input end of the main controller is connected with the output end of the first flow meter 6, the second flow meter 10 and the temperature sensing thermocouple 14.

[0041] In addition, in the embodiment of the utility model, the temperature measuring point on the exhaust pipe 2 is set on the main controller, and the input end of the first regulating valve 7 is associated with the temperature measuring point. The amount of high-temperature flue gas entering the exhaust pipe 2 is controlled by adjusting the opening size of the first regulating valve 7, and then the temperature after the first regulating valve 7 is controlled to be close to the set temperature measuring point value.

[0042] Similarly, for the aforementioned temperature sensing thermocouple 14, in the embodiments of the present application, the temperature sensing thermocouple 14 is associated with the second regulating valve 9, when the temperature sensing thermocouple 14 monitors that the temperature of the flue gas discharged from the coke oven 4 is higher than 100℃, the temperature sensing thermocouple 14 will send a signal to the main controller, and the main controller will send an instruction to the second regulating valve 9 at the same time, and the second regulating valve 9 will close or adjust the opening of the valve body, cutting off or adjusting the gas feeding operation to the corresponding coke oven 4, to avoid the coke being dried into dust and then discharged into the atmosphere due to the excessively high temperature of the flue gas. Of course, it is not limited to using the above-mentioned electrical control method with the main controller, and manual control can also be selected, and the production personnel can operate flexibly according to the situation during production to ensure the best drying effect.

[0043] In summary, the coke drying system for blast furnace in the present application, by introducing the rich waste heat flue gas in the heat exchanger of the hot blast furnace into the coke oven under the assistance of the high-temperature induced draft fan, and then drying and dehumidifying the coke in the coke oven. With the help of the rich waste heat flue gas, the coke can maintain dryness before entering the blast furnace for sintering, avoiding the situation that the subsequent production is affected due to the water content in the coke. At the same time, with the help of the adsorption performance of the coke itself, some components in the rich waste heat flue gas are absorbed, avoiding pollution of the atmospheric environment.

[0044] The above-mentioned embodiments are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and it cannot limit the protection scope of the present application, any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A coke drying system for a blast furnace, characterized in that, include: Hot air furnace heat exchanger (1); Smoke exhaust pipe (2), which is connected to the hot air furnace heat exchanger (1); High-temperature induced draft fan (3), wherein the high-temperature induced draft fan (3) is installed on the smoke exhaust duct (2); The coke bin (4) is located downstream of the high-temperature induced draft fan (3) and connected to the flue gas duct (2); The high-temperature exhaust gas in the exhaust pipe (2) is drawn into the coke bin (4) by the high-temperature exhaust fan (3), thereby drying and dehumidifying the coke in the coke bin (4). Upstream of the connection point between the exhaust pipe (2) and the high-temperature induced draft fan (3), a first manual butterfly valve (5), a first flow meter (6) and a first regulating valve (7) are sequentially arranged along the flow direction of the high-temperature flue gas. The first manual butterfly valve (5) is used to control the on / off of the high-temperature flue gas on the exhaust pipe (2); the first flow meter (6) is used to monitor the flow rate of the high-temperature flue gas on the exhaust pipe (2); and the first regulating valve (7) is used to regulate the flow rate of the high-temperature flue gas entering the high-temperature induced draft fan (3).

2. The coke drying system for a blast furnace according to claim 1, characterized in that, Several coke bins (4) are connected in parallel.

3. The coke drying system for a blast furnace according to claim 2, characterized in that, The coke bin (4) is provided with an air inlet (401), and an air inlet pipe (8) is connected to the air inlet (401). The air inlet pipe (8) is connected to the exhaust pipe (2).

4. A coke drying system for a blast furnace according to claim 3, characterized in that, The air inlet pipe (8) is equipped with a second regulating valve (9) and a second flow meter (10). The second regulating valve (9) is used to regulate the flow rate of flue gas drawn into the coke bin (4), and the second flow meter (10) is used to monitor the flow rate of flue gas entering the coke bin (4).

5. A coke drying system for a blast furnace according to claim 4, characterized in that, Several second manual butterfly valves (11) are connected in parallel on the air inlet pipe (8) to control the flow of flue gas into the coke bin (4).

6. A coke drying system for a blast furnace according to claim 2, characterized in that, The coke bin (4) is provided with a ventilation opening (402), and a ventilation duct (12) is connected to the ventilation opening (402).

7. A coke drying system for a blast furnace according to claim 6, characterized in that, The ventilation duct (12) is equipped with an axial flow fan (13) and a thermocouple (14); the axial flow fan (13) is used to exhaust air from the coke bin (4), and the thermocouple (14) is used to monitor the temperature of the exhaust gas on the ventilation duct (12).

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