System for internal circulation of gasified molten gas flow

Abstract

The utility model relates to the technical field of solid waste treatment, and particularly discloses a system for internal circulation of gasified molten airflow, which comprises a gasifier, a melting furnace, a waste heat recovery device and a hot blast stove, the gasification furnace is connected with the melting furnace, and is used for introducing flue gas into the melting furnace after the raw materials are gasified to form the flue gas; the melting furnace is connected with the waste heat recovery device and used for melting the flue gas and discharging high-temperature gas generated in the melting process to the waste heat recovery device. The waste heat recovery device is connected with the hot blast stove and used for conducting waste heat recovery on the high-temperature gas to generate recovered gas and discharging the recovered gas to the hot blast stove. The hot blast stove is connected with the gasification furnace and is used for conveying the heated gas to the gasification furnace. According to the scheme, the hot blast stove is arranged to heat gas and convey the heated gas to the gasification furnace, the hot blast stove is connected with the waste heat recovery device, and the recovered gas generated by waste heat recovery can be reused, so that the energy utilization rate is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of solid waste treatment, and in particular to a system for internal circulation of a gasified molten gas flow. Background Art

[0002] Gasification melting technology is a technology for clean incineration of solid waste. This technology combines the advantages of garbage gasification and ash melting technology. Its working principle is that solid waste enters the gasification furnace for gasification after pretreatment, and then enters the melting furnace for high-temperature combustion to generate slag.

[0003] A large amount of high-temperature air is generated during the melting process in the melting furnace. The existing treatment method is generally to recover the waste heat of the high-temperature air and then discharge it. However, the gas after the waste heat recovery still carries heat energy that cannot be used, resulting in low energy utilization rate. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a system for internal circulation of gasification and melting air flow, so as to solve the problem of low energy utilization rate in existing gasification and melting processing methods.

[0005] In order to achieve the above technical objectives, the present application provides a system for internal circulation of gasified and molten gas flow, comprising: a gasifier, a melting furnace, a waste heat recovery device and a hot blast furnace;

[0006] The gasification furnace is connected to the melting furnace and is used for gasifying the raw materials to form flue gas, and then passing the flue gas into the melting furnace;

[0007] The melting furnace is connected to the waste heat recovery device, and is used to melt the flue gas, and to discharge the high-temperature gas generated during the melting process to the waste heat recovery device;

[0008] The waste heat recovery device is connected to the hot blast furnace, and is used to recover the waste heat of the high-temperature gas to generate recovered gas, and is used to discharge the recovered gas to the hot blast furnace;

[0009] The hot blast furnace is connected to the gasification furnace and is used for conveying heated gas to the gasification furnace.

[0010] Further, a dust collector is included;

[0011] The dust collector is connected to the waste heat recovery device and the hot air furnace respectively, and is used to produce dust and dust-free gas after dust removal treatment on the recovered gas;

[0012] The dust collector is also used to discharge the dust-free gas to the hot blast furnace.

[0013] Furthermore, it also includes an exhaust gas treatment device;

[0014] The dust collector is connected to the exhaust gas treatment device and is used to discharge the dust-free gas to the exhaust gas treatment device;

[0015] The tail gas treatment device is used for denitrification and desulfurization of the dust-free gas.

[0016] Further, it also includes: an oxygen-enriched generator;

[0017] The oxygen-enriched generator is connected to the dust collector and the hot air furnace respectively;

[0018] The dust collector is used to discharge the dust-free gas to the oxygen-enriched generator;

[0019] The oxygen-enriched generator is used to increase the oxygen content of the dust-free gas and then discharge it to the hot blast furnace.

[0020] Further, it also includes: a gas-solid separator;

[0021] The gas-solid separator is connected to the top of the gasifier through an air suction pipe;

[0022] The gas-solid separator is connected to the side of the gasifier through a circulation pipe;

[0023] The gas-solid separator is connected to the melting furnace through a discharge pipe;

[0024] The gas-solid separator is used to separate the flue gas discharged from the gasifier, and then discharge the gas after the flue gas separation into the melting furnace, and discharge the solid after the flue gas separation into the gasifier.

[0025] Furthermore, a slag discharge port and an air inlet are provided at the bottom of the gasifier;

[0026] A ventilation member is provided on the air inlet;

[0027] The hot air furnace is connected to the air inlet;

[0028] The ventilation member is used for allowing gas to be blown into the gasification furnace from bottom to top, and for limiting the passage of raw materials.

[0029] Furthermore, a gasifier igniter is provided in the gasifier.

[0030] Furthermore, a gasifier air supply pipe is connected to the side of the gasifier.

[0031] Furthermore, a melting furnace igniter is provided in the melting furnace.

[0032] Furthermore, a melting furnace air supply pipe is connected to the side of the melting furnace.

[0033] It can be seen from the above technical scheme that the present application provides a system for internal circulation of gasified molten gas flow, including: a gasifier, a melting furnace, a waste heat recovery device and a hot blast furnace; the gasifier is connected to the melting furnace, and is used to gasify the raw material to form flue gas, and then pass the flue gas into the melting furnace; the melting furnace is connected to the waste heat recovery device, and is used to melt the flue gas, and is used to discharge the high-temperature gas generated during the melting process to the waste heat recovery device; the waste heat recovery device is connected to the hot blast furnace, and is used to recover the waste heat of the high-temperature gas to produce recovered gas, and is used to discharge the recovered gas to the hot blast furnace; the hot blast furnace is connected to the gasifier, and is used to transport the heated gas to the gasifier.

[0034] In this solution, a hot blast furnace is provided to heat the gas and then transport it to the gasification furnace. By connecting the hot blast furnace with the waste heat recovery device, the recovered gas generated by the waste heat recovery can be reused, thereby effectively improving energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0036] Figure 1 A schematic diagram of the structure of a system for internal circulation of a gasified molten gas flow provided in an embodiment of the present application;

[0037] In the figure: 1. gas-solid separator; 2. air suction pipe; 3. gasifier; 4. gasifier air supply pipe; 5. gasifier igniter; 6. gasification raw material feeding mechanism; 7. ventilation parts; 8. air inlet; 9. slag discharge port; 10. hot air furnace; 11. return air duct; 12. circulation pipe; 13. discharge pipe; 14. molten raw material feeding mechanism; 15. molten furnace igniter; 16. molten furnace air supply pipe; 17. molten furnace; 18. molten furnace exhaust port; 19. second slag discharge port; 20. quenching and conveying equipment; 21. waste heat recovery device; 22. air duct; 23. dust collector; 24. fan; 25. oxygen enrichment generator; 26. tail gas treatment device. DETAILED DESCRIPTION

[0038] The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the specification of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection requested by the present application.

[0039] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0040] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a replaceable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0041] See also Figure 1 A system for internal circulation of a gasified and molten gas flow provided in an embodiment of the present application includes: a gasification furnace 3, a melting furnace 17, a waste heat recovery device 21 and a hot blast furnace 10.

[0042] The gasifier 3 is connected to the melting furnace 17, and is used to gasify the raw material to form flue gas, and then pass the flue gas into the melting furnace 17. Specifically, the gasifier 3 may be connected to a gasification raw material feeding mechanism 6, and a gasifier igniter 5 is provided in the gasifier 3. After the gasification raw material feeding mechanism 6 conveys the raw material into the gasifier 3, the gasifier igniter 5 ignites the raw material, so that the raw material is pyrolyzed and gasified in the gasifier 3 to form flue gas.

[0043] The melting furnace 17 is connected to the waste heat recovery device 21, which is used to melt the flue gas and to discharge the high-temperature gas generated during the melting process to the waste heat recovery device 21. Specifically, a molten raw material feeding mechanism 14 may be connected to the melting furnace 17, and a melting furnace igniter 15 is provided in the melting furnace 17. After the flue gas enters the melting furnace 17, the molten raw material feeding mechanism 14 transports the molten raw material into the melting furnace 17, and the molten raw material is ignited by the melting furnace igniter 15 and mixed with the flue gas to form a vitrified glass body. The high-temperature gas generated during the process is discharged into the waste heat recovery device 21 through the melting furnace exhaust port 18 for waste heat recovery. It should be noted that the molten raw material may be, for example, hazardous waste doped with waste glass, quartz sand and other silicon-containing substances as auxiliary materials.

[0044] The waste heat recovery device 21 is connected to the hot blast furnace 10, and is used to recover the waste heat of the high-temperature gas to produce recovered gas, and to discharge the recovered gas to the hot blast furnace 10. The waste heat recovery device 21 may be a waste heat recovery boiler. Specifically, the melting temperature inside the melting furnace 17 is above 1200°C, and the temperature of the gas discharged can be reduced to about 300°C by the waste heat recovery device 21, and then discharged to the hot blast furnace 10.

[0045] The hot blast furnace 10 is connected to the gasifier 3 and is used to deliver heated gas to the gasifier 3. Specifically, the hot blast furnace 10 is used to heat the gas and deliver it into the gasifier 3; connecting the hot blast furnace 10 with the waste heat recovery device 21 can reuse the recovered gas, reduce the energy consumption of the hot blast furnace 10 and the gasifier 3, and improve the energy utilization rate.

[0046] It should be noted that, in addition to being connected to the waste heat recovery device 21 , the hot blast furnace 10 may also be connected to the external atmosphere, a blower or a natural gas connection pipe and other devices to ensure that the gas source of the hot blast furnace 10 is sufficient.

[0047] In one embodiment, a second slag discharge port 19 is provided at the bottom of the melting furnace 17; the second slag discharge port 19 is connected to a chilling conveying device 20; the chilling conveying device 20 is used to cool the glass body and then send it to the next process.

[0048] In one embodiment, a dust collector 23 is also included; the dust collector 23 is respectively connected to the waste heat recovery device 21 and the hot air furnace 10, and is used to produce dust and dust-free gas after dust removal treatment of the recovered gas; the dust collector 23 is also used to discharge the dust-free gas to the hot air furnace 10.

[0049] The dust collector 23 may be a bag dust collector, which can remove dust in the recovered gas. The dust collector 23 and the waste heat recovery device 21 may be connected via an air duct 22 .

[0050] Furthermore, it also includes an exhaust gas treatment device 26; the dust collector 23 is connected to the exhaust gas treatment device 26, for discharging the dust-removed gas to the exhaust gas treatment device; the exhaust gas treatment device 26 is used to denitrify and desulfurize the dust-removed gas, and then the treated gas can be discharged into the atmosphere.

[0051] It should be noted that a wind valve may be provided between the dust collector 23 and the de-pinning device 26, and the wind valve can be used to control the dust collector 23 and the de-pinning device 26 to be connected or disconnected with each other, and also to open the wind valve to discharge the gas when the pressure inside the system is too high. In addition, a pressure transmitter may be provided between the dust collector 23 and the wind valve, and the pressure inside the system can be maintained through the pressure transmitter, and the pressure transmitter is electrically connected to the wind valve, and the wind valve can be opened when the pressure inside the system is detected to exceed a preset value.

[0052] In one embodiment, it also includes: an oxygen-enriched generator 25; the oxygen-enriched generator 25 is connected to the dust collector 23 and the hot air furnace 10 respectively; the dust collector 23 is used to discharge the dust-free gas to the oxygen-enriched generator 25; the oxygen-enriched generator 25 is used to increase the oxygen content of the dust-free gas and then discharge it to the hot air furnace 10.

[0053] The oxygen-enriched generator 25 can increase the oxygen content of the dust-free gas, ensuring that the oxygen content of the dust-free gas is greater than 21%, which is helpful for combustion and gasification of raw materials inside the gasifier 3 .

[0054] In application, a fan 24 may be provided between the oxygen-enriched generator 25 and the dust collector 23 to promote air flow. The oxygen-enriched generator 25 may be connected to the hot air furnace 10 via the return air duct 11 .

[0055] In other embodiments, it also includes: a gas-solid separator 1; the gas-solid separator 1 is connected to the top of the gasifier 3 through the suction pipe 2; the gas-solid separator 1 is connected to the side of the gasifier 3 through the circulation pipe 12; the gas-solid separator 1 is connected to the melting furnace 17 through the discharge pipe 13; the gas-solid separator 1 is used to separate the flue gas discharged from the gasifier 3, and then discharge the gas after the flue gas separation into the melting furnace 17, and discharge the solid after the flue gas separation into the gasifier 3.

[0056] Specifically, the flue gas generated by the gasifier 3 contains gas and solid. The smoke particles can be separated by the gas-solid separator 1 and enter the circulation pipe 12 and then enter the gasifier 3 again for gasification, thereby further improving the gasification effect.

[0057] In another embodiment, a slag discharge port 9 and an air inlet 8 are provided at the bottom of the gasifier 3; a ventilation member 7 is provided on the air inlet 8; a hot air furnace 10 is connected to the air inlet 8; the ventilation member 7 is used to allow gas to be blown into the gasifier 3 from bottom to top, and to limit the passage of raw materials.

[0058] Among them, the ventilation member 7 can be a structure such as a multi-head wind hood, with multiple through holes or gaps, and the widest size of the through holes or gaps is smaller than the size of the material, so as to prevent the material from passing through and allow the gas to pass through.

[0059] In this embodiment, the bottom air intake method can drive the material to be lifted and fully contact with the material during the air intake process, thereby improving the mixing effect of air and material and reducing mixing.

[0060] In a more specific embodiment, the gasifier 3 is connected to the gasifier gas supply pipe 4 at its side. The melting furnace 17 is connected to the melting furnace gas supply pipe 16 at its side.

[0061] The gasifier air supply pipe 4 can add air to the gasifier 3 during the raw material gasification and combustion process, maintaining the raw material in an incomplete combustion state and continuously cracking and gasifying. The melting furnace air supply pipe 16 can add air during the melting process, increase the oxygen content in the melting furnace 17 and improve the melting effect.

[0062] The above are only preferred embodiments of the present application and are not intended to limit the present utility model. Although the present application has been described in detail with reference to the examples, those skilled in the art can still modify the technical solutions recorded in the aforementioned examples or make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A system for internal circulation of gasified molten gas flow, characterized in that: include: A gasification furnace (3), a melting furnace (17), a waste heat recovery device (21) and a hot air furnace (10); The gasification furnace (3) is connected to the melting furnace (17) and is used for gasifying the raw materials to form flue gas, and then passing the flue gas into the melting furnace (17); The melting furnace (17) is connected to the waste heat recovery device (21) and is used to melt the flue gas and discharge the high-temperature gas generated during the melting process to the waste heat recovery device (21); The waste heat recovery device (21) is connected to the hot blast furnace (10), and is used to recover waste heat from the high-temperature gas to generate recovered gas, and is used to discharge the recovered gas to the hot blast furnace (10); The hot blast furnace (10) is connected to the gasification furnace (3) and is used to transport heated gas to the gasification furnace (3).

2. The system for internal circulation of gasified molten gas flow according to claim 1, characterized in that: Also included is a dust collector (23); The dust collector (23) is connected to the waste heat recovery device (21) and the hot air furnace (10) respectively, and is used to perform dust removal treatment on the recovered gas to produce dust and dust-free gas; The dust collector (23) is also used to discharge the dust-free gas to the hot air furnace (10).

3. The system for internal circulation of gasified molten gas flow according to claim 2, characterized in that: Also included is an exhaust gas treatment device (26); The dust collector (23) is connected to the exhaust gas treatment device (26) via a wind valve, and is used to discharge the dust-free gas to the exhaust gas treatment device after the wind valve is opened; The tail gas treatment device (26) is used to perform denitrification and desulfurization treatment on the dust-free gas.

4. The system for internal circulation of gasified molten gas flow according to claim 2, characterized in that: Also includes: Oxygen enrichment generator (25); The oxygen-enriched generator (25) is connected to the dust collector (23) and the hot air furnace (10) respectively; The dust collector (23) is used to discharge the dust-free gas to the oxygen-enriched generator (25); The oxygen-enriched generator (25) is used to increase the oxygen content of the dust-free gas before discharging it to the hot blast furnace (10).

5. The system for internal circulation of gasified molten gas flow according to claim 1, characterized in that: Also includes: Gas-solid separator (1); The gas-solid separator (1) is connected to the top of the gasifier (3) via an air suction pipe (2); The gas-solid separator (1) is connected to the side of the gasifier (3) via a circulation pipe (12); The gas-solid separator (1) is connected to the melting furnace (17) via a discharge pipe (13); The gas-solid separator (1) is used to separate the flue gas discharged from the gasifier (3), and then discharge the gas after the flue gas separation into the melting furnace (17), and discharge the solid after the flue gas separation into the gasifier (3).

6. The system for internal circulation of gasified molten gas flow according to claim 1, characterized in that: The bottom of the gasification furnace (3) is provided with a slag discharge port (9) and an air inlet (8); The air inlet (8) is provided with a ventilation member (7); The hot air furnace (10) is connected to the air inlet (8); The ventilation element (7) is used to allow gas to be blown into the gasification furnace (3) from bottom to top, and to limit the passage of raw materials.

7. The system for internal circulation of gasified molten gas flow according to claim 1, characterized in that: A gasifier igniter (5) is provided in the gasifier (3).

8. The system for internal circulation of gasified molten gas flow according to claim 1, characterized in that: A gasifier gas supply pipe (4) is connected to the side of the gasifier (3).

9. The system for internal circulation of gasified molten gas flow according to claim 1, characterized in that: A melting furnace igniter (15) is provided in the melting furnace (17).

10. The system for internal circulation of gasified molten gas flow according to claim 1, characterized in that: A melting furnace air supply pipe (16) is connected to the side of the melting furnace (17).

Images