Nitrogen-doped dry quenching device

Abstract

The utility model provides a nitrogen-doped dry quenching device which comprises a dry quenching furnace, a circulating air supply mechanism and a nitrogen doping mechanism, the dry quenching furnace comprises a furnace body and a furnace shell, a coke discharge chute is arranged at the bottom of the furnace body, the upper part of the furnace body is connected with a waste gas eduction tube, and the upper part of the furnace shell is connected with an air induction tube; the circulating air supply mechanism comprises a primary dust remover, a waste heat boiler, a secondary dust remover, a circulating fan and a preheating device which are connected to the waste gas eduction tube, and the air outlet end of the preheating device is connected to the side wall of the lower portion of the furnace shell. The nitrogen doping mechanism comprises a fan front nitrogen blowing-in pipe, a fan shaft seal nitrogen blowing-in pipe, a fan rear nitrogen blowing-in pipe, an air introduction nitrogen blowing-in pipe and a chute nitrogen blowing-in pipe. After nitrogen is introduced into the device, the burn-out rate of coke in the dry quenching process can be reduced, the yield of finished coke is increased, the benefit is increased, and the economical efficiency is improved. In addition, after nitrogen is introduced, combustible gas components can be reduced, safe and stable operation of the dry quenching furnace system is further enhanced, and the safety of the system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coke dry quenching, and in particular to a nitrogen-doped coke dry quenching device. Background Art

[0002] At present, there are two coke quenching processes in the coking industry. One is a quenching method using water as the quenching medium, and the other is a method of using inert gas as a circulating gas to exchange heat with the hot red coke in a dry quenching furnace to quench the red coke.

[0003] Coke will burn out during the dry quenching process. The burning of coke is the phenomenon of mass loss caused by the redox reaction (carbon dissolution reaction) between the carbon element in the coke and certain components in the circulating gas (O2, CO2, H2O, etc.). The carbon dissolution reaction in the dry quenching process mainly occurs in the high temperature area. There are many factors that affect the intensity of the carbon dissolution reaction, such as: reaction temperature, reactant concentration, coke powder particle size, coke powder amount, primary dust removal efficiency, etc.

[0004] Therefore, the current problems with dry quenching of coke are: first, the burn loss of coke is large during dry quenching, which reduces the coke output and affects the efficiency; second, the combustible components of the circulating gas during coke dry quenching, such as CO, H2 and other combustible gas content, are difficult to control. When the combustible gas components exceed the standard, it affects the safe and stable operation of the dry quenching furnace system. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a nitrogen-doped coke dry quenching device to solve the operation safety problems caused by the large burn-out rate and combustible components in the coke dry quenching process.

[0006] The utility model provides a nitrogen-doped coke dry quenching device, comprising a dry quenching furnace, a circulating air supply mechanism and a nitrogen-doping mechanism, wherein:

[0007] The dry quenching furnace comprises a furnace body and a furnace shell, a coke discharge chute is arranged at the bottom of the furnace body, an air outlet at the top of the furnace body is connected to an exhaust gas outlet pipe, and an air inlet at the top of the furnace shell is connected to an air inlet pipe;

[0008] The circulating air supply mechanism includes a primary dust collector connected to the exhaust gas outlet pipe, the other end of the exhaust gas outlet pipe is connected to the waste heat boiler, the air outlet of the waste heat boiler is connected to the secondary dust collector through a pipeline, the secondary dust collector is connected to the circulating fan through the fan air inlet pipe, the air outlet of the circulating fan is connected to the preheating device through the fan air outlet pipe, the air outlet end of the preheating device is connected to the side wall of the lower part of the furnace shell through the circulating air inlet pipe, and the circulating air inlet pipe is provided with a circulating air flow regulating valve;

[0009] The nitrogen doping mechanism comprises a nitrogen blowing pipe in front of the fan, a nitrogen blowing pipe for the fan shaft seal, a nitrogen blowing pipe after the fan, an air introduction nitrogen blowing pipe and a chute nitrogen blowing pipe. The nitrogen blowing pipe in front of the fan is connected to the side wall of the fan air inlet pipe, the nitrogen blowing pipe after the fan is connected to the side wall of the fan air outlet pipe, the nitrogen blowing pipe for the fan shaft seal is arranged on one side of the fan shaft, the air introduction nitrogen blowing pipe is connected to the air introduction pipe, and the chute nitrogen blowing pipe is connected to the side wall of the coke discharge chute.

[0010] Preferably, the preheating device is connected to a bypass flow regulating pipe, the other end of the bypass flow regulating pipe is connected to the air inlet of the furnace shell, and a bypass flow regulating valve is provided on the bypass flow regulating pipe.

[0011] Preferably, the prestorage chamber of the preheating device is connected to a first prestorage chamber pressure regulating pipe and a second prestorage chamber pressure regulating pipe, the first prestorage chamber pressure regulating pipe is provided with a bypass pipe connected to a prestorage chamber pressure regulating valve, the end of the first prestorage chamber pressure regulating pipe is connected to a waste gas recovery mechanism, the second prestorage chamber pressure regulating pipe is connected to a high-sulfur flue gas dust removal device through a high-sulfur flue gas pipeline, and the first prestorage chamber pressure regulating pipe, the second prestorage chamber pressure regulating pipe and the bypass pipe connected to the prestorage chamber pressure regulating valve are all provided with pressure regulating valves.

[0012] Preferably, the nitrogen doping mechanism further comprises a bypass pipe nitrogen blowing pipe, and the bypass pipe nitrogen blowing pipe is connected to the side wall of the bypass flow regulating pipe.

[0013] Preferably, an inlet baffle is provided at the air inlet of the circulation fan.

[0014] Preferably, a first furnace top relief valve and a second furnace top relief valve are provided on the top of the furnace body, and a terminal end of the second furnace top relief valve is connected to the waste gas recovery mechanism.

[0015] Preferably, the primary dust collector is provided with an emergency relief valve.

[0016] Preferably, the exhaust gas recovery mechanism includes a dust collecting hood, the ends of the first pre-storage chamber pressure regulating pipe and the second furnace top vent valve are arranged in the integrated hood, the top of the furnace shell, the middle of the coke discharge chute and the conveyor belt at the lower end of the coke discharge chute are respectively connected to the exhaust gas dust collection pipeline through the exhaust gas dust removal pipeline, the exhaust gas dust removal pipeline is connected to the environmental dust removal device, the dust collecting hood is connected to the exhaust gas dust collection pipeline through the dust collecting branch, and the exhaust gas dust collecting pipeline is provided with a dust collecting electric valve near the top of the furnace shell.

[0017] Preferably, the waste gas recovery mechanism further comprises a high-sulfur flue gas dust collecting pipe connected to the side wall of the coke discharge chute, and the other end of the high-sulfur flue gas dust collecting pipe is connected to the high-sulfur flue gas pipeline.

[0018] Working principle of the utility model: The nitrogen-doped dry coke quenching device of the utility model uses a circulating air supply mechanism and a nitrogen-doping mechanism to adjust the air distribution system of the dry quenching furnace, reduce the amount of air introduced, and add a certain amount of nitrogen for mixed use to achieve the purpose of cooling the coke. Before or after the fan is turned on, the nitrogen filling point is selected according to the pressure fluctuation of the pre-storage chamber, the nitrogen filling valve is opened, and nitrogen is introduced into the dry quenching furnace. After the nitrogen is introduced, the circulating gas components will be diluted, and the concentration of combustible gases such as CO and H2 will also be reduced. At this time, the opening of the air introduction valve can be reduced to reduce the amount of air introduced.

[0019] Beneficial effects of the utility model: The nitrogen-doped coke dry quenching device of the utility model can reduce the coke burning rate during the coke dry quenching process after the nitrogen is introduced, increase the yield of finished coke, increase the benefits, and improve the economy. In addition, the introduction of nitrogen can reduce the flammable gas components, further enhance the safe and stable operation of the dry quenching furnace system, and improve the system safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the nitrogen-doped dry quenching device of the utility model.

[0021] In the figure: dry quenching furnace 1, furnace body 11, furnace shell 12, coke discharge chute 13, exhaust gas outlet pipe 14, air inlet pipe 15, first furnace top release valve 16, second furnace top release valve 17; circulating air supply mechanism 20, primary dust collector 201, waste heat boiler 202, secondary dust collector 203, fan air inlet pipe 204, circulating fan 205, fan air outlet pipe 206, preheating device 207, circulating air inlet pipe 208, circulating air flow regulating valve 209, bypass flow regulating pipe 210, bypass flow regulating valve 211, first pre-storage chamber pressure regulating pipe 21 2, second pre-storage chamber pressure regulating pipe 213, pre-storage chamber pressure regulating bypass pipe 214, high-sulfur flue gas pipeline 215, inlet baffle 216, emergency relief valve 217; nitrogen doping mechanism 3, nitrogen blowing pipe 31 before fan, nitrogen blowing pipe 32 for fan shaft seal, nitrogen blowing pipe 33 after fan, nitrogen blowing pipe 34 for air introduction, nitrogen blowing pipe 35 for chute, nitrogen blowing pipe 36 for bypass pipe; exhaust gas recovery mechanism 4, dust collecting hood 41, exhaust gas dust collecting pipeline 42, exhaust gas dust removal pipeline 43, dust collecting branch 44, dust collecting electric valve 45, high-sulfur flue gas dust collecting pipe 46. DETAILED DESCRIPTION

[0022] In order to make the technical solution of the present utility model easier to understand, the technical solution of the present utility model is now clearly and completely described in the form of specific embodiments in combination with the accompanying drawings.

[0023] Embodiment 1:

[0024] like Figure 1As shown, a nitrogen-doped coke dry quenching device of this embodiment includes a dry quenching furnace 1, a circulating air supply mechanism 20 and a nitrogen-doping mechanism 3, wherein:

[0025] The dry quenching furnace 1 comprises a furnace body 11 and a furnace shell 12. A coke discharge chute 13 is provided at the bottom of the furnace body 11. An air outlet at the top of the furnace body 11 is connected to an exhaust gas outlet pipe 14. An air inlet at the top of the furnace shell 12 is connected to an air inlet pipe 15.

[0026] The circulating air supply mechanism 20 includes a primary dust collector 201 connected to the exhaust gas outlet pipe 14, the other end of the exhaust gas outlet pipe 14 is connected to the waste heat boiler 202, the air outlet of the waste heat boiler 202 is connected to the secondary dust collector 203 through a pipeline, the secondary dust collector 203 is connected to the circulating fan 205 through the fan air inlet pipe 204, the air outlet of the circulating fan 205 is connected to the preheating device 207 through the fan air outlet pipe 206, the air outlet end of the preheating device 207 is connected to the side wall of the lower part of the furnace shell 12 through the circulating gas introduction pipe 208, and the circulating gas introduction pipe 208 is provided with a circulating gas flow regulating valve 209;

[0027] The nitrogen doping mechanism 3 includes a nitrogen blowing pipe 31 before the fan, a nitrogen blowing pipe 32 for the fan shaft seal, a nitrogen blowing pipe 33 after the fan, an air introduction nitrogen blowing pipe 34 and a chute nitrogen blowing pipe 35. The nitrogen blowing pipe 31 before the fan is connected to the side wall of the fan air inlet pipe 204, the nitrogen blowing pipe 33 after the fan is connected to the side wall of the fan air outlet pipe 206, the nitrogen blowing pipe 32 for the fan shaft seal is arranged on one side of the fan shaft, the air introduction nitrogen blowing pipe 34 is connected to the air introduction pipe 15, and the chute nitrogen blowing pipe 35 is connected to the side wall of the coke discharge chute 13.

[0028] Embodiment 2:

[0029] like Figure 1 As shown, a nitrogen-doped coke dry quenching device of this embodiment includes a dry quenching furnace 1, a circulating air supply mechanism 20 and a nitrogen-doping mechanism 3, wherein:

[0030] The dry quenching furnace 1 includes a furnace body 11 and a furnace shell 12. A coke discharge chute 13 is provided at the bottom of the furnace body 11. The air outlet at the top of the furnace body 11 is connected to the exhaust gas outlet pipe 14. The air inlet at the top of the furnace shell 12 is connected to the air introduction pipe 15. The top of the furnace body 11 is provided with a first furnace top relief valve 16 and a second furnace top relief valve 17. The end of the second furnace top relief valve 17 is connected to the exhaust gas recovery mechanism 4.

[0031] The circulating air supply mechanism 20 includes a primary dust collector 201 connected to the exhaust gas outlet pipe 14, the other end of the exhaust gas outlet pipe 14 is connected to the waste heat boiler 202, the air outlet of the waste heat boiler 202 is connected to the secondary dust collector 203 through a pipeline, the secondary dust collector 203 is connected to the circulating fan 205 through the fan air inlet pipe 204, the air outlet of the circulating fan 205 is connected to the preheating device 207 through the fan air outlet pipe 206, the air outlet end of the preheating device 207 is connected to the side wall of the lower part of the furnace shell 12 through the circulating gas inlet pipe 208, and the circulating gas inlet pipe 208 is provided with a circulating gas flow regulating valve 209; the preheating device 207 is connected to a bypass flow regulating pipe 210, the other end of the bypass flow regulating pipe 210 is connected to the air inlet of the furnace shell 12, and the bypass flow regulating valve 211 is provided on the bypass flow regulating pipe 210. The pre-storage chamber of the preheating device 207 is connected to the first pre-storage chamber pressure regulating pipe 212 and the second pre-storage chamber pressure regulating pipe 213. The first pre-storage chamber pressure regulating pipe 212 is provided with a pre-storage chamber pressure regulating bypass pipe 214. The end of the first pre-storage chamber pressure regulating pipe 212 is connected to the exhaust gas recovery mechanism 4. The second pre-storage chamber pressure regulating pipe 213 is connected to the high-sulfur flue gas dust removal device through the high-sulfur flue gas pipeline 215. The first pre-storage chamber pressure regulating pipe 212, the second pre-storage chamber pressure regulating pipe 213 and the pre-storage chamber pressure regulating bypass pipe 214 are all provided with pressure regulating valves. The air inlet of the circulating fan 205 is provided with an inlet baffle 216. The primary dust collector 201 is provided with an emergency relief valve 217.

[0032] The nitrogen doping mechanism 3 includes a nitrogen blowing pipe 31 before the fan, a nitrogen blowing pipe 32 for the fan shaft seal, a nitrogen blowing pipe 33 after the fan, an air introduction nitrogen blowing pipe 34 and a chute nitrogen blowing pipe 35. The nitrogen blowing pipe 31 before the fan is connected to the side wall of the fan air inlet pipe 204, the nitrogen blowing pipe 33 after the fan is connected to the side wall of the fan air outlet pipe 206, the nitrogen blowing pipe 32 for the fan shaft seal is arranged on one side of the fan shaft, the air introduction nitrogen blowing pipe 34 is connected to the air introduction pipe 15, and the chute nitrogen blowing pipe 35 is connected to the side wall of the coke discharge chute 13. The nitrogen doping mechanism 3 also includes a bypass pipe nitrogen blowing pipe 36, which is connected to the side wall of the bypass flow regulating pipe 210.

[0033] The exhaust gas recovery mechanism 4 includes a dust collecting hood 41, the first pre-storage chamber pressure regulating pipe 212 and the second furnace top release valve 17 are arranged in the integrated hood 41, the top of the furnace shell 12, the middle of the coke discharge chute 13 and the conveyor belt at the lower end of the coke discharge chute 13 are respectively connected to the exhaust gas dust collection pipeline 43 through the exhaust gas dust collection pipeline 42, the exhaust gas dust collection pipeline 43 is connected to the environmental dust removal device, the dust collecting hood 41 is connected to the exhaust gas dust collection pipeline 42 through the dust collection branch 44, and the exhaust gas dust collection pipeline 42 is provided with a dust collection electric valve 45 near the top of the furnace shell 12. The exhaust gas recovery mechanism also includes a high-sulfur flue gas dust collection pipe 46 connected to the side wall of the coke discharge chute 13, and the other end of the high-sulfur flue gas dust collection pipe 46 is connected to the high-sulfur flue gas pipeline 215.

[0034] It should be noted that the embodiments described herein are only partial embodiments of the present invention, rather than all implementations of the present invention, and the embodiments are only exemplary, and their role is only to provide a more intuitive and clear way to understand the content of the present invention, rather than to limit the technical solutions described in the present invention. Without departing from the concept of the present invention, all other implementation methods that ordinary technicians in the field can think of without creative work, and other simple replacements and various changes to the technical solutions of the present invention, all belong to the protection scope of the present invention.

Claims

1. A nitrogen-doped coke dry quenching device, characterized in that: It comprises a dry quenching furnace (1), a circulating air supply mechanism (20) and a nitrogen doping mechanism (3), wherein: The dry quenching furnace (1) comprises a furnace body (11) and a furnace shell (12); a coke discharge chute (13) is provided at the bottom of the furnace body (11); an air outlet at the top of the furnace body (11) is connected to an exhaust gas outlet pipe (14); and an air inlet at the top of the furnace shell (12) is connected to an air inlet pipe (15); The circulating air supply mechanism (20) comprises a primary dust collector (201) connected to the exhaust gas outlet pipe (14); the other end of the exhaust gas outlet pipe (14) is connected to the waste heat boiler (202); the air outlet of the waste heat boiler (202) is connected to the secondary dust collector (203) through a pipeline; the secondary dust collector (203) is connected to the circulating fan (205) through a fan air inlet pipe (204); the air outlet of the circulating fan (205) is connected to the preheating device (207) through a fan air outlet pipe (206); the air outlet end of the preheating device (207) is connected to the side wall of the lower part of the furnace shell (12) through a circulating gas introduction pipe (208); and a circulating gas flow regulating valve (209) is provided on the circulating gas introduction pipe (208); The nitrogen doping mechanism (3) comprises a nitrogen blowing pipe (31) before the fan, a nitrogen blowing pipe (32) for the fan shaft seal, a nitrogen blowing pipe (33) after the fan, an air introduction nitrogen blowing pipe (34) and a chute nitrogen blowing pipe (35). The nitrogen blowing pipe (31) before the fan is connected to the side wall of the fan air inlet pipe (204), the nitrogen blowing pipe (33) after the fan is connected to the side wall of the fan air outlet pipe (206), the nitrogen blowing pipe (32) for the fan shaft seal is arranged on one side of the fan shaft, the nitrogen blowing pipe (34) for the air introduction is connected to the air introduction pipe (15), and the nitrogen blowing pipe (35) for the chute is connected to the side wall of the coke discharge chute (13).

2. The nitrogen-doped coke dry quenching device according to claim 1, characterized in that: The preheating device (207) is connected to a bypass flow regulating pipe (210), the other end of the bypass flow regulating pipe (210) is connected to the air inlet of the furnace shell (12), and a bypass flow regulating valve (211) is provided on the bypass flow regulating pipe (210).

3. The nitrogen-doped coke dry quenching device according to claim 1, characterized in that: The pre-storage chamber of the preheating device (207) is connected to a first pre-storage chamber pressure regulating pipe (212) and a second pre-storage chamber pressure regulating pipe (213); the first pre-storage chamber pressure regulating pipe (212) is provided with a pre-storage chamber pressure regulating bypass pipe (214); the end of the first pre-storage chamber pressure regulating pipe (212) is connected to the exhaust gas recovery mechanism (4); the second pre-storage chamber pressure regulating pipe (213) is connected to the high-sulfur flue gas dust removal device through a high-sulfur flue gas pipeline (215); and the first pre-storage chamber pressure regulating pipe (212), the second pre-storage chamber pressure regulating pipe (213) and the pre-storage chamber pressure regulating bypass pipe (214) are all provided with pressure regulating valves.

4. The nitrogen-doped coke dry quenching device according to claim 1, characterized in that: The nitrogen doping mechanism (3) further comprises a bypass pipe nitrogen blowing pipe (36), and the bypass pipe nitrogen blowing pipe (36) is connected to the side wall of the bypass flow regulating pipe (210).

5. The nitrogen-doped coke dry quenching device according to claim 1, characterized in that: An inlet baffle (216) is provided at the air inlet of the circulation fan (205).

6. The nitrogen-doped coke dry quenching device according to claim 1, characterized in that: A first furnace top relief valve (16) and a second furnace top relief valve (17) are provided on the top of the furnace body (11), and the end of the second furnace top relief valve (17) is connected to the waste gas recovery mechanism (4).

7. The nitrogen-doped coke dry quenching device according to claim 1, characterized in that: The primary dust collector (201) is provided with an emergency relief valve (217).

8. The nitrogen-doped coke dry quenching device according to claim 3, characterized in that: The exhaust gas recovery mechanism (4) comprises a dust collecting hood (41), the ends of the first pre-storage chamber pressure regulating pipe (212) and the second furnace top relief valve (17) are arranged in the dust collecting hood (41), the top of the furnace shell (12), the middle of the coke discharge chute (13) and the conveyor belt at the lower end of the coke discharge chute (13) are respectively connected to the exhaust gas dust removal pipeline (43) through the exhaust gas dust collection pipeline (42), the exhaust gas dust removal pipeline (43) is connected to the environmental dust removal device, the dust collecting hood (41) is connected to the exhaust gas dust collection pipeline (42) through the dust collection branch (44), and the exhaust gas dust collection pipeline (42) is provided with a dust collection electric valve (45) near the top of the furnace shell (12).

9. The nitrogen-doped coke dry quenching device according to claim 8, characterized in that: The waste gas recovery mechanism also includes a high-sulfur flue gas dust collecting pipe (46) connected to the side wall of the coke discharge chute (13), and the other end of the high-sulfur flue gas dust collecting pipe (46) is connected to the high-sulfur flue gas pipeline (215).

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