Device for reducing coke burn-out rate and carbon emission of dry quenching furnace and dry quenching system

Abstract

The utility model discloses a device for reducing coke burn-out rate and carbon emission of a dry quenching furnace. The device comprises the dry quenching furnace, a waste nitrogen collecting unit, an original air leading-in pipe, an air inlet pipe, an auxiliary economizer and a circulating gas fan, the original air leading-in pipe is communicated with the dry quenching furnace; the waste nitrogen collecting unit comprises a rectifying tower, a subcooler, a heat exchanger, a filter and an emptying column which are connected in sequence, and the rectifying tower is communicated with the subcooler through a waste nitrogen output pipe; the waste nitrogen collecting unit is communicated with the original air leading-in pipe through a pipeline, and a water seal structure is arranged on the pipeline where the waste nitrogen collecting unit is communicated with the original air leading-in pipe. The device disclosed by the utility model not only can stably operate and realize resource utilization of waste nitrogen, but also avoids combustion of coke powder and coke in the dry quenching furnace by an air introduction process, reduces the coke burn loss rate and the emission of carbon dioxide, reduces the emission of greenhouse gas and simultaneously realizes improvement of enterprise benefits. The utility model further discloses a dry quenching system.

Description

Technical Field

[0001] The utility model relates to the technical field of coke dry quenching, and particularly relates to a device for reducing the coke burning loss rate and carbon emission of a dry quenching furnace. Background Art

[0002] At present, during the production operation of a coke dry quenching device, a large amount of air needs to be introduced to burn the volatile components of coke. However, this part of the air will also burn some coke at the same time, resulting in certain waste and a significant increase in carbon dioxide emissions. This situation runs counter to the requirements of the current national energy control policy.

[0003] Patent CN201820821471.2 discloses a coke dry quenching device, especially a dry quenching furnace air inlet pipe for purifying air, which at least includes a dry quenching furnace, an air inlet pipe, a flow regulating valve, and a purification unit. The air inlet pipe is communicated with the atmosphere through a pipe fitting valve at the air inlet end, and the outlet end is connected to the annular flue of the dry quenching furnace. The purification unit and the flow regulating valve are sequentially connected to the air inlet pipe through pipe fitting valves. The device disclosed in this patent removes impurities such as dust, grease, and moisture in the outside air through the purification unit provided on the air inlet pipe, avoiding the water-gas reaction between water entering the coke dry quenching circulating gas system and high-temperature coke, and thus reducing the coke burning loss rate. However, this method requires additional purification equipment, increasing the cost burden. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a device for reducing the coke burning loss rate and carbon emission of a dry quenching furnace. By recycling the waste nitrogen gas in the rectifying column and reusing it in the dry quenching furnace, the purpose of reducing the coke burning loss rate in the dry quenching furnace can be achieved without additional equipment.

[0005] To solve the above technical problems, the utility model provides the following technical solutions:

[0006] A device for reducing the coke burning loss rate and carbon emission of a dry quenching furnace includes a dry quenching furnace, a waste nitrogen gas collection unit, an original air inlet pipe, an air intake pipe, a secondary economizer, and a circulating gas fan;

[0007] The original air inlet pipe is communicated with the dry quenching furnace;

[0008] The waste nitrogen gas collection unit includes a rectifying column, a subcooler, a heat exchanger, a filter, and a vent column connected in sequence. The rectifying column is communicated with the subcooler through a waste nitrogen gas output pipe;

[0009] The waste nitrogen gas collection unit is communicated with the original air inlet pipe through a pipeline, and a water seal structure is provided on the pipeline where the waste nitrogen gas collection unit is communicated with the original air inlet pipe.

[0010] Further, the rectifying column is communicated with the subcooler through a waste nitrogen output pipe.

[0011] Further, the heat exchanger is heat exchanger A and heat exchanger B arranged in parallel.

[0012] Further, the waste nitrogen gas outlets of the heat exchanger are respectively communicated with the water cooling tower and the filter through pipelines, and a valve is arranged on the pipeline where the heat exchanger is communicated with the water cooling tower.

[0013] Further, a valve is arranged on the pipeline where the filter is communicated with the air defense column.

[0014] Further, the filter is two molecular sieve filters arranged in parallel.

[0015] Further, a red coke feeder is arranged at the top of the coke dry quenching furnace, a coke discharge port is arranged at the bottom of the coke dry quenching furnace, and the coke discharge port is communicated with a vibrating feeder.

[0016] Further, the coke dry quenching furnace is provided with a circulating cooling gas inlet and a circulating cooling gas outlet. The circulating cooling gas inlet is communicated with the secondary economizer through a pipeline. The air inlet of the secondary economizer is communicated with a circulating gas blower. The secondary economizer is also communicated with an annular air duct of the coke dry quenching furnace through a bypass pipeline. The secondary economizer is also communicated with a circulating gas discharge pipe. The circulating gas enters the secondary economizer through the circulating gas blower for cooling, and the cooled gas enters the bottom of the coke dry quenching furnace to cool the red coke.

[0017] Further, the circulating cooling gas outlet is communicated with the annular air duct.

[0018] Further, the water seal structure includes a water seal tank, and the lower part of the water seal tank is communicated with a sewage discharge pipeline.

[0019] A coke dry quenching system includes the device for reducing the coke burn-off rate and carbon emission of the coke dry quenching furnace described in any one of the above.

[0020] 1. The device for reducing the coke burn-off rate and carbon emission of the coke dry quenching furnace provided by the present utility model pre-treats the waste nitrogen gas collection unit through a molecular sieve filter and stabilizes the pressure of the pipeline through a water seal structure, so that the waste nitrogen gas can stably enter the coke dry quenching furnace, optimizing the stable operation of the device.

[0021] 2. The device for reducing the coke burning loss rate and carbon emission of the coke dry quenching furnace provided by the utility model dilutes the concentrations of H2 and CO in the annular air duct of the coke dry quenching furnace by introducing qualified waste nitrogen gas into the annular air duct, making the operation of the whole equipment safer and more reliable. The introduced air will also burn coke powder and coke, and at the same time, it avoids the combustion of coke powder and coke in the coke dry quenching furnace by the air introduced by the original air inlet pipe, reduces the coke burning loss rate and the emission of carbon dioxide, reduces the emission of greenhouse gases, and realizes the improvement of enterprise benefits at the same time. Brief Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the device for reducing the coke burning loss rate and carbon emission of the coke dry quenching furnace of the utility model;

[0023] Figure 2 is a schematic structural diagram of the molecular sieve filter of the utility model.

[0024] In the figure:

[0025] 1. Rectifying tower; 2. Nitrogen output pipe; 3. Waste nitrogen output pipe; 4. Liquid oxygen output pipe; 5. Liquid air output pipe; 6. Sub-cooler; 7. Heat exchanger A; 8. Heat exchanger B; 9. Water cooling tower inlet pipe; 10. Filter; 11. Venting column; 12. Original air inlet pipe; 13. Air inlet pipe; 14. Coke dry quenching furnace; 15. Red coke feeder; 16. Radar level gauge; 17. Coke discharge port; 18. Vibrating feeder; 19. Secondary economizer; 20. Circulating cooling gas inlet; 21. Circulating cooling gas outlet; 22. Bypass pipeline; 23. Circulating gas discharge pipe; 24. Circulating gas fan; 25. Circulating cooling gas discharge pipeline; 26. Annular air duct; 27. Water seal tank; 28. Sewage pipeline; 29. Adsorbed waste nitrogen gas outlet; 30. Upper molecular sieve filling area; 31. Lower alumina ball filling area; 32. Adsorbed waste nitrogen gas inlet before adsorption; 33. Manhole. Detailed Embodiment

[0026] Next, the technical solution of the utility model will be clearly and completely described in conjunction with specific embodiments.

[0027] This embodiment provides a device for reducing the coke burning loss rate and carbon emission of the coke dry quenching furnace, as Figure 1 shown, the device includes a coke dry quenching furnace 14, a waste nitrogen gas collection unit, an original air inlet pipe 12, an air inlet pipe 13, a secondary economizer 19 and a circulating gas fan 24.

[0028] The original intake air pipe 12 is connected to the coke dry quenching furnace 14. The coke dry quenching furnace 14 is provided with an annular air duct 26, a red coke inlet, a coke discharge outlet 17, a radar level gauge 16, a circulating cooling gas inlet 20 and a circulating cooling gas outlet 21. The red coke inlet is arranged at the top of the coke dry quenching furnace 14, and a red coke feeder 15 is arranged above the red coke inlet. The red coke discharge port of the red coke feeder 15 corresponds to the red coke inlet (not marked in the figure) vertically. The coke discharge outlet 17 is arranged at the bottom of the coke dry quenching furnace 14. The coke discharge outlet 17 is connected to a vibrating feeder 18 arranged directly below the coke discharge outlet 17, so as to discharge the cooled coke in the coke dry quenching furnace 14.

[0029] The circulating cooling gas inlet 20 is connected to the secondary economizer 19 through a pipeline. The air inlet of the secondary economizer 19 is connected to a circulating gas fan 24. The secondary economizer 19 is also connected to the annular air duct 26 of the coke dry quenching furnace 14 through a bypass pipeline 22. The secondary economizer 19 is also connected to a circulating gas relief pipe 23. The circulating gas enters the coke dry quenching furnace 14 through the circulating cooling gas inlet 20. After the circulating gas circulates and exchanges heat and cold in the coke dry quenching furnace 14, it is discharged from the circulating cooling gas outlet 21. The circulating cooling gas outlet 21 is connected to the annular air duct 26, so as to discharge the circulating gas, the circulated dirty nitrogen gas, and the hydrogen and carbon monoxide in the coke dry quenching furnace.

[0030] The dirty nitrogen gas collection unit includes a rectifying column 1, a subcooler 6, a heat exchanger, a filter 10 and a vent column 11 connected in sequence. A nitrogen output pipe 2 is arranged at the top of the rectifying column 1. The rectifying column 1 is also provided with a dirty nitrogen gas output pipe 3, a liquid oxygen output pipe 4 and a liquid air output pipe 5. The dirty nitrogen gas output pipe 3 is connected to the air inlet of the subcooler 6. The dirty nitrogen gas cooled by the subcooler 6 enters the parallel heat exchangers. The parallel heat exchangers are respectively a heat exchanger A and a heat exchanger B. The dirty nitrogen gas cooled again by the heat exchanger enters the filter 10. The heat exchanger is also connected to a water cooling tower through a water cooling tower inlet pipe 9. A valve is arranged on the water cooling tower inlet pipe 9.

[0031] The filter 10 can be set as two parallel molecular sieve filters. The specific structure of the molecular sieve filter is as Figure 2As shown in the figure. The molecular sieve filter is provided with an outlet 29 for the dirty nitrogen gas after adsorption, an upper molecular sieve filling area 30, a lower alumina ball filling area 31, an inlet 32 for the dirty nitrogen gas before adsorption, and a manhole 33. A valve is provided between two parallel molecular sieve filters. One molecular sieve filter is in adsorption, and the other molecular sieve filter is used for the regeneration of the molecular sieve. Explanation of the adsorption process of one molecular sieve filter: The dirty nitrogen gas after passing through the heat exchanger enters the molecular sieve filter from the inlet 32 for the dirty nitrogen gas before adsorption of one molecular sieve filter. After being adsorbed by the alumina balls filled in the lower alumina ball filling area 31 and the 13X-APG molecular sieve filled in the upper molecular sieve filling area 30 in the molecular sieve filter, the alumina balls and 13X-APG molecular sieve that have completed adsorption expand in volume after adsorbing impurities and moisture. The dirty nitrogen gas after adsorption is discharged from the outlet 29 for the dirty nitrogen gas after adsorption. Explanation of the regeneration process of the other molecular sieve filter: The dirty nitrogen gas after being adsorbed by one molecular sieve filter enters the molecular sieve filter to be regenerated from the outlet 29 for the dirty nitrogen gas after adsorption. The relatively high-temperature dirty nitrogen gas in the molecular sieve filter causes the temperature of the alumina balls and 13X-APG molecular sieve that have expanded in volume to also increase, causing the moisture in the alumina balls and 13X-APG molecular sieve to evaporate, thereby completing the regeneration of the alumina balls and 13X-APG molecular sieve. Finally, the dirty nitrogen gas is discharged from the outlet 29 for the dirty nitrogen gas after adsorption of the regenerated molecular sieve adsorber.

[0032] The outlet of the gas passing through the molecular sieve filter 10 is connected to the air defense column 11 through a pipeline, and a valve is provided on the connected pipeline.

[0033] The dirty nitrogen gas collection unit is connected to the original air inlet pipe 12 through a pipeline, and a water seal structure is provided on the pipeline connecting the dirty nitrogen gas collection unit and the original air inlet pipe 12. The water seal structure includes a water seal tank 27, and the lower part of the water seal tank 27 is connected to a sewage discharge pipeline 28. The water seal structure ensures a stable pressure in the pipeline during the process of the dirty nitrogen gas entering the original air inlet pipe 12 from the dirty nitrogen gas collection unit. A valve is also provided on the pipeline connecting the dirty nitrogen gas collection unit and the original air inlet pipe 12.

[0034] The working principle of the device for specifically reducing the coke burning loss rate and carbon emissions of the coke dry quenching furnace is explained as follows:

[0035] The waste nitrogen gas in the rectifying column 1 is first cooled by the subcooler 6 and the heat exchanger, and then filtered by the filter 10 to remove impurities and moisture. During the filtration process, the adsorption and regeneration of molecular sieves are realized through two parallel molecular sieve filters, that is, one molecular sieve filter is in adsorption, and the other molecular sieve filter is in the regeneration of molecular sieves. This saves the entire filtration process, and at the same time makes full use of the heat of the waste nitrogen gas, realizing the rational application of resources. The oxygen content of the filtered waste nitrogen gas is about 5%. Before the waste nitrogen gas is utilized, the filtered waste nitrogen gas directly enters the vent column 11 and then is discharged into the atmosphere. In order to make better use of the waste nitrogen gas, the filtered waste nitrogen gas enters the original air inlet pipe 12 through the water seal structure.

[0036] In order to introduce the waste nitrogen gas into the coke dry quenching furnace 14 and avoid the increase in coke burning loss rate and carbon dioxide emissions caused by the original introduced air, during the operation of the device, the valve for discharging the gas from the original air inlet pipe 12 is closed, so that the waste nitrogen gas enters the annular air duct 26 of the coke dry quenching furnace 14, diluting the combustible gases H2 and CO continuously released from the charged red coke in the circulating gas in the coke dry quenching furnace 14, avoiding the increase in coke burning loss rate caused by the combustion of coke powder and coke by the air introduced in the original process, and the problem of increased carbon (CO and CO2) emissions caused by the reaction of O2 and CO in the introduced air to form CO2, and then the reaction of CO2 with coke to regenerate CO.

[0037] The circulating gas enters the secondary economizer 19 after passing through the circulating gas fan 24. The secondary economizer 19 cools the circulating gas. The cooled circulating gas cools the coke through the circulating cooling gas inlet 20. Part of the gas coming out of the secondary economizer 19 enters the annular air duct 26 of the coke dry quenching furnace 14 through the bypass pipeline 22 for cooling the red coke. Finally, the circulating gas in the coke dry quenching furnace 14 (including the introduced waste nitrogen gas, H2 and CO generated in the coke dry quenching furnace 14, and the gas entering from the secondary economizer 19) is discharged through the circulating cooling gas outlet 21.

[0038] In addition, although the waste nitrogen gas entering the coke dry quenching furnace 14 dilutes H2 and CO, due to the long-term operation of the coke dry quenching furnace 14, the problems of increased H2 and CO still exist. When the waste nitrogen gas is introduced, the air inlet regulating valve on the air inlet pipe 13 is opened, so that a small amount of air enters the coke dry quenching furnace 14, consuming part of the combustible gases (H2 and CO) to meet the process requirements of safe production, reducing the concentrations of H2 and CO to a controllable range, and then closing the air inlet regulating valve on the air inlet pipe 13 and continuing to introduce the waste nitrogen gas into the coke dry quenching furnace 14. By maintaining the above operations, the carbon dioxide in the flue gas emission of the coke dry quenching furnace 14 is reduced from about 15% to less than 5% in general, and the coke burning loss rate is reduced from the original 2.23% to 0.6%, achieving the goal of reducing the coke burning loss rate and carbon emissions of the coke dry quenching furnace 14.

[0039] It should be noted that the above embodiments are only used to illustrate the technical concept and features of the present utility model. The above and below described therein are all corresponding to the drawings of the present utility model and are not used to limit specific content. The purpose is to enable those skilled in the art to understand the content of the present utility model and implement it accordingly, and it cannot be used to limit the protection scope of the present utility model. Any equivalent changes or modifications made according to the spirit and essence of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A device for reducing the coke burnout rate and carbon emissions in a coke dry quenching furnace, characterized in that, It includes a coke dry quenching furnace (14), a waste nitrogen gas collection unit, an original air inlet pipe (12), an air intake pipe (13), a secondary economizer (19), and a circulating gas fan (24); The original air inlet pipe (12) is communicated with the coke dry quenching furnace (14); The waste nitrogen gas collection unit includes a rectifying column (1), a subcooler (6), a heat exchanger, a filter (10), and a vent column (11) connected in sequence. The rectifying column (1) is communicated with the subcooler (6) through a waste nitrogen gas output pipe (3); The waste nitrogen gas collection unit is communicated with the original air inlet pipe (12) through a pipeline, and a water seal structure is provided on the pipeline where the waste nitrogen gas collection unit is communicated with the original air inlet pipe (12).

2. The device for reducing the coke burnout rate and carbon emissions of the coke dry quenching furnace according to claim 1, wherein The heat exchanger is a heat exchanger A (7) and a heat exchanger B (8) arranged in parallel.

3. The device for reducing the coke burn-off rate and carbon emissions in the coke dry quenching furnace according to claim 1, characterized in that, The waste nitrogen gas outlet of the heat exchanger is communicated with the filter (10) through a pipeline, and the heat exchanger is also communicated with a water cooling tower through a water cooling tower intake pipe (9). A valve is provided on the pipeline of the water cooling tower intake pipe (9).

4. The device for reducing the coke burn-off rate and carbon emissions of the coke dry quenching furnace according to claim 3, wherein The filter (10) is two molecular sieve filters arranged in parallel.

5. The device for reducing the coke burnout rate and carbon emissions of the coke dry quenching furnace according to claim 1, characterized in that, The top of the coke dry quenching furnace (14) is provided with a red coke feeder (15), the bottom of the coke dry quenching furnace (14) is provided with a coke discharge port (17), and the coke discharge port (17) is communicated with a vibrating feeder (18) arranged directly below the coke discharge port (17).

6. The device for reducing the coke burn-off rate and carbon emissions of a coke dry quenching furnace according to claim 1, characterized in that, The coke dry quenching furnace (14) is provided with a circulating cooling gas inlet (20) and a circulating cooling gas outlet (21). The circulating cooling gas inlet (20) is communicated with the secondary economizer (19) through a pipeline. The air inlet of the secondary economizer (19) is communicated with the circulating gas fan (24). The secondary economizer (19) is also communicated with the annular air duct (26) of the coke dry quenching furnace (14) through a bypass pipeline (22). The secondary economizer (19) is also communicated with a circulating gas discharge pipe (23).

7. The device for reducing the coke burn-off rate and carbon emissions of a coke dry quenching furnace according to claim 6, wherein The circulating cooling gas outlet (21) is communicated with the annular air duct (26).

8. The device for reducing the coke burn-off rate and carbon emissions in the coke dry quenching furnace according to claim 1, wherein The water seal structure includes a water seal tank (27), and the lower part of the water seal tank (27) is communicated with a sewage discharge pipeline (28).

9. A coke dry quenching system, characterized in that, It includes the device for reducing the coke burning loss rate and carbon emission of the coke dry quenching furnace according to any one of the above claims 1-8.

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