Tail gas waste heat utilization device for carbon black production reaction furnace

Abstract

The utility model discloses a carbon black production reaction furnace tail gas waste heat utilization device which comprises an air preheater arranged at one end of a smoke exhaust pipeline of a carbon black reaction furnace, the air preheater is a tube box type air preheater, and a smoke inlet and a smoke outlet of the air preheater are respectively provided with a stop valve. Pulse purging assemblies are symmetrically arranged on the two sides of a shell of the air preheater in the inclined direction in a staggered mode, and the air inlet ends of the pulse purging assemblies are communicated with a compressed air source. A tube box type air preheater, a raw oil preheater and a waste heat boiler are sequentially arranged at one end of a smoke exhaust pipeline of a carbon black reaction furnace, so that the utilization efficiency of waste heat of tail gas of the reaction furnace is effectively improved; the tail gas treatment device is compact in design, and heat in tail gas can be fully utilized.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon black production auxiliary equipment, in particular to a device for utilizing waste heat from tail gas of a carbon black production reactor. Background Art

[0002] Carbon black is a form of amorphous carbon. A light, loose, and extremely fine black powder, it is produced by the incomplete combustion or thermal decomposition of heavy oil or fuel oil in the absence of sufficient air. During the carbon black production process, the reactor generates a large amount of high-temperature exhaust gas. To improve energy efficiency, this high-temperature exhaust gas is often passed through an air preheater to cool the flue gas and recycle the heat. However, existing air preheaters have several issues with carbon black exhaust gas treatment. For example, long-term use of the air preheater can lead to dust and ash accumulation on the heat exchange pipes and fins, seriously affecting heat exchange efficiency and flue gas flow, leading to large vibrations and abnormal noises. Regular cleaning is required, which is labor-intensive. Furthermore, due to the compact internal piping layout of the air preheater, cleaning operations take a long time. Furthermore, simple air preheaters do not fully utilize the waste heat in the high-temperature exhaust gas, requiring a large amount of cooling water during the secondary quenching process, resulting in a double waste of heat and water resources. In light of these issues, in-depth research has been conducted, leading to the present case. Utility Model Content

[0003] In view of the deficiencies in the prior art, the present invention provides a device for utilizing waste heat from tail gas in a carbon black production reactor, which solves the problems raised in the background art.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a device for utilizing the waste heat of tail gas from a carbon black production reactor, comprising an air preheater arranged at one end of a smoke exhaust pipe of the carbon black reactor, the air preheater being a tube-box type air preheater, the smoke inlet and outlet of the air preheater being both provided with stop valves, pulse purge assemblies being symmetrically arranged on both sides of the shell of the air preheater along an inclined direction, the air inlet end of the pulse purge assembly being connected to a compressed air source, a conical cover being provided on the top of the air preheater, a control valve being installed on the top of the conical cover, one end of the control valve being connected to a dust exhaust fan, the air outlet end of the dust exhaust fan being connected to a filtering and dust removal assembly, the smoke outlet end of the air preheater being connected to a raw oil preheater, the smoke outlet end of the raw oil preheater being connected to the air inlet of a waste heat boiler evaporator, the exhaust port of the waste heat boiler evaporator being connected to a quenching heat exchanger, and the discharge end of the quenching heat exchanger being connected to a main bag filter.

[0005] The above-mentioned pulse purge assembly includes a connecting seat, a one-way valve and a pulse solenoid valve. The connecting seat is welded on the side wall of the air preheater in an inclined direction and one end extends into the air preheater. The one-way valve is installed on the connecting seat and the conduction direction points to the inside of the air preheater. The pulse solenoid valve is installed on one end of the one-way valve and is connected to the compressed air source through an air injection pipe.

[0006] A manual ball valve is provided at the connection position between the air injection pipe and the compressed air source.

[0007] The above-mentioned filtering and dust removal assembly includes a filter cartridge, a mounting plate and a membrane dust removal filter cartridge. One end of the filter cartridge is connected to the air outlet end of the dust exhaust fan. The mounting plate is fixed in the filter cartridge. Threaded through holes are opened along the circular array on the mounting plate. The membrane dust removal filter cartridge is screwed to the threaded through hole position through a threaded seat.

[0008] A metal porous mesh plate is buckled on the opening position of the lower end of the filter cartridge.

[0009] A cyclone dust collector is provided between the control valve and the dust exhaust fan, and the air outlet of the cyclone dust collector is connected to the air inlet end of the dust exhaust fan.

[0010] The utility model provides a device for utilizing the waste heat of exhaust gas from a carbon black production reactor. It has the following beneficial effects: the device for utilizing the waste heat of exhaust gas from a carbon black production reactor is provided with a tube-box air preheater at one end of the exhaust pipe of the carbon black reactor. After the high-temperature exhaust gas is used to preheat the fresh air required for the production operation of the reactor, the flue gas further enters the raw oil preheater to preheat the raw oil liquid required for carbon black production. After the flue gas has undergone secondary heat exchange and cooling, it further enters the evaporator of the waste heat boiler to evaporate and heat the water in the waste heat boiler, thereby effectively improving the utilization efficiency of the waste heat of the reactor exhaust gas. After the triple cooling, the flue gas The air further enters the rapid cooling heat exchanger for secondary rapid cooling, and then enters the main bag filter for filtration and separation. The design is compact and can make full use of the heat in the exhaust gas. In addition, a pulse purge component is set on the side of the air preheater, which can realize pulse purge of the inner cavity of the air preheater during the shutdown or maintenance of the reactor, and further cooperate with the dust exhaust fan to discharge the cleaned smoke and dust, thereby effectively reducing the dust accumulation on the internal pipelines of the air preheater and the heat exchange fins, further improving the heat exchange efficiency and improving the utilization rate of the waste heat of the reactor exhaust. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the main structure of a device for utilizing waste heat from tail gas in a carbon black production reactor described in the utility model.

[0012] Figure 2 This is a schematic diagram of the main structure of the air preheater described in the utility model.

[0013] Figure 3 This is a schematic cross-sectional structural diagram of the filter cartridge of the present invention.

[0014] In the figure: 1. Carbon black reactor; 2. Air preheater; 3. Stop valve; 4. Compressed air source; 5. Conical cover; 6. Control valve; 7. Dust exhaust fan; 8. Crude oil preheater; 9. Waste heat boiler evaporator; 10. Rapid cooling heat exchanger; 11. Main bag filter; 12. Connecting seat; 13. One-way valve; 14. Pulse solenoid valve; 15. Air injection pipe; 16. Manual ball valve; 17. Filter cartridge; 18. Mounting plate; 19. Film-coated dust filter cartridge; 20. Metal porous mesh plate; 21. Cyclone dust collector. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] Example: In conjunction with the specification Figure 1-3It can be seen that in order to solve the shortcomings of the air preheating device in the prior art in utilizing the waste heat of the tail gas of the carbon black reactor 1, a carbon black production reactor waste heat utilization device is specifically designed, including an air preheater 2 arranged at one end of the exhaust pipe of the carbon black reactor 1, the air preheater 2 is a tube box type air preheater 2, and the flue gas inlet and outlet positions of the air preheater 2 are both provided with a stop valve 3. The two sides of the shell of the air preheater 2 are staggered and symmetrically provided with pulse purge components along the inclined direction, and the air inlet end of the pulse purge component is connected to the compressed air. The air source 4 is connected, a conical cover 5 is provided on the top of the air preheater 2, a control valve 6 is installed on the top of the conical cover 5, one end of the control valve 6 is connected to a dust exhaust fan 7, the air outlet end of the dust exhaust fan 7 is connected to a filter dust removal component, the flue gas outlet end of the air preheater 2 is connected to a raw oil preheater 8, the flue gas outlet end of the raw oil preheater 8 is connected to the air inlet of the waste heat boiler evaporator 9, the exhaust port of the waste heat boiler evaporator 9 is connected to the quenching heat exchanger 10, and the discharge end of the quenching heat exchanger 10 is connected to the main bag filter 11. A tube-box air preheater 2 is set at one end of the exhaust pipe of the carbon black reactor 1. After the high-temperature exhaust gas is used to preheat the fresh air required for the production operation of the reactor, the flue gas further enters the raw oil preheater 8 to preheat the raw oil liquid required for carbon black production. After the secondary heat exchange and cooling, the flue gas further enters the evaporator of the waste heat boiler to evaporate and heat the water in the waste heat boiler, thereby effectively improving the utilization efficiency of the waste heat of the reactor tail gas. After the triple cooling, the flue gas further enters the rapid cooling heat exchanger 10. After the secondary rapid cooling, it enters the main bag filter 11 for filtration and separation. The design is compact and can fully utilize the heat in the exhaust gas. In addition, a pulse purge component is provided on the side of the air preheater 2, which can realize pulse purge of the inner cavity of the air preheater 2 during the shutdown or maintenance of the reactor, and further cooperate with the dust exhaust fan 7 to discharge the cleaned smoke and dust, thereby effectively reducing the dust accumulation on the internal pipelines of the air preheater 2 and the heat exchange fins, further improving the heat exchange efficiency, and improving the utilization rate of the waste heat of the reactor exhaust.

[0017] In the specific implementation process, as an optimal setting, the above-mentioned pulse purge assembly includes a connecting seat 12, a one-way valve 13 and a pulse solenoid valve 14. The connecting seat 12 is welded on the side wall of the air preheater 2 in an inclined direction and one end extends into the air preheater 2. The one-way valve 13 is installed on the connecting seat 12 and the conduction direction points to the inside of the air preheater 2. The pulse solenoid valve 14 is installed on one end of the one-way valve 13 and is connected to the compressed air source 4 through the air injection pipe 15. A manual ball valve 16 is provided at the connection position between the air injection pipe 15 and the compressed air source 4. When in use, the regulating effect of the pulse solenoid valve 14 can be utilized to inject the high-pressure nitrogen provided by the compressed air source 4 into the air preheater 2 through the one-way valve 13 and the connecting seat 12, thereby utilizing the pulse airflow to perform wind purge on the heat exchange tube array and heat exchange fins in the air preheater 2. During the purge process, the control valve 6 and the dust exhaust fan 7 on the top of the conical cover 5 are opened to extract the cleaned dust. The structure is simple and the degree of automation is high.

[0018] During the specific implementation process, as a preferred setting, the above-mentioned filtering and dust removal assembly includes a filter cartridge 17, a mounting plate 18 and a membrane dust removal filter cartridge 19. One end of the filter cartridge 17 is connected to the air outlet end of the dust exhaust fan 7. The mounting plate 18 is fixed in the filter cartridge 17. Threaded through holes are opened along the annular array on the mounting plate 18. The membrane dust removal filter cartridge 19 is screwed to the position of the threaded through holes through a threaded seat. A metal porous mesh plate 20 is buckled at the opening position of the lower end of the filter cartridge 17; a cyclone dust collector 21 is provided between the control valve 6 and the dust exhaust fan 7, and the air outlet of the cyclone dust collector 21 is connected to the air inlet end of the dust exhaust fan 7. Under the action of the negative pressure of the exhaust fan, the dust-containing gas in the air preheater 2 is extracted, and the extracted gas first It first enters the cyclone dust collector 21 for preliminary filtration to filter out large particles of dust in the air flow, and the fine particles further enter the filter cartridge 17 under the action of wind pressure and are deeply purified through the coated dust filter cartridge 19. The purified gas is discharged through the lower metal porous mesh plate 20. When the coated dust filter cartridge 19 needs to be replaced, the metal porous mesh plate 20 can be removed and the coated dust filter cartridge 19 can be rotated to release the connection between the coated dust filter cartridge 19 and the mounting plate 18. It can be cleaned or replaced and then reinstalled, which greatly improves the cleaning efficiency of the air preheater 2, better meets the use needs of the air preheater 2, and thereby improves the heat exchange efficiency of the exhaust gas of the carbon black reactor 1.

[0019] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for utilizing waste heat from tail gas of a carbon black production reactor, comprising an air preheater arranged at one end of an exhaust pipe of the carbon black reactor, characterized in that: The air preheater is a tube-box type air preheater, and the flue gas inlet and outlet positions of the air preheater are both provided with stop valves. Pulse purge components are symmetrically arranged on both sides of the shell of the air preheater in an inclined direction, and the air inlet end of the pulse purge component is connected to the compressed air source. A conical cover is provided on the top of the air preheater, and a control valve is installed on the top of the conical cover. One end of the control valve is connected to a dust exhaust fan, and the air outlet end of the dust exhaust fan is connected to a filtering and dust removal component. The flue gas outlet end of the air preheater is connected to a crude oil preheater, and the flue gas outlet end of the crude oil preheater is connected to the air inlet of the waste heat boiler evaporator. The exhaust port of the waste heat boiler evaporator is connected to the quenching heat exchanger, and the discharge end of the quenching heat exchanger is connected to the main bag filter.

2. The device for utilizing waste heat from tail gas of a carbon black production reactor according to claim 1, characterized in that: The pulse purge assembly includes a connecting seat, a one-way valve and a pulse solenoid valve. The connecting seat is welded on the side wall of the air preheater in an inclined direction and one end extends into the air preheater. The one-way valve is installed on the connecting seat and the conduction direction points to the inside of the air preheater. The pulse solenoid valve is installed on one end of the one-way valve and is connected to the compressed air source through an air injection pipe.

3. The device for utilizing waste heat from tail gas of a carbon black production reactor according to claim 2, characterized in that: A manual ball valve is provided at the connection position between the air injection pipe and the compressed air source.

4. The device for utilizing waste heat from tail gas of a carbon black production reactor according to claim 1, characterized in that: The filtering and dust removal assembly includes a filter cartridge, a mounting plate and a membrane dust removal filter cartridge. One end of the filter cartridge is connected to the air outlet end of the dust exhaust fan. The mounting plate is fixed in the filter cartridge. Threaded through holes are opened along the annular array on the mounting plate. The membrane dust removal filter cartridge is screwed to the threaded through hole position through a threaded seat.

5. The device for utilizing waste heat from tail gas of a carbon black production reactor according to claim 4, characterized in that: A metal porous mesh plate is buckled on the opening position of the lower end of the filter cartridge.

6. The device for utilizing waste heat from tail gas of a carbon black production reactor according to claim 1, characterized in that: A cyclone dust collector is provided between the control valve and the dust exhaust fan, and the air outlet of the cyclone dust collector is connected to the air inlet end of the dust exhaust fan.

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