Gasification melting and sludge drying combined system

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Through the combined system of gasification and melting and sludge drying, the hot air flow generated by the gasification furnace and the melting furnace is used to dry the sludge, and combined with waste heat recovery and heat pump technology, the problem of high energy consumption in the hot drying process of the sludge is solved. , achieving improved resource utilization and cost reduction.

CN222348874UActive Publication Date: 2025-01-14SHENZHEN ZEYUAN ENERGY CO LTD

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Patent Information

Application Number: CN202421206679.5
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-05-29
Publication Date: 2025-01-14
Estimated Expiration: 2034-05-29

AI Technical Summary

Technical Problem

The sludge thermal drying process consumes a lot of energy and has low resource utilization, so it is difficult for the existing technology to effectively reduce energy consumption and improve resource utilization.

Method used

Design a combined gasification and melting and sludge drying system, and the hot air flow generated by the gasification furnace and the melting furnace are used to dry the sludge, and the dry sludge and hot air flow are circulated, combining waste heat recovery and Heat pump technology to improve energy utilization.

Benefits of technology

It effectively reduces the energy consumption of the sludge drying process, improves resource utilization, reduces exhaust gas treatment costs, and extends the service life of the equipment.

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Abstract

The utility model relates to the technical field of solid waste treatment, and particularly discloses a gasification melting and sludge drying combined system which comprises a gasification furnace, a melting furnace and a sludge drying assembly. The sludge drying assembly comprises a dryer and a dehydrator; a gas outlet of the gasification furnace is connected with a gas inlet of the melting furnace; a gas outlet of the melting furnace is connected with a gas inlet of the dryer; an air outlet of the dryer is connected with the dehydrator; a discharge hole of the dryer is connected with the gasifier; and a gas outlet of the dehydrator is connected with the gasification furnace. According to the gasification melting and sludge drying combined system provided by the scheme, hot air flow generated by the gasification furnace and the melting furnace can be provided for the drying machine, so that heat of the hot air flow can be utilized in the sludge drying process of the drying machine, and the energy utilization rate is increased; meanwhile, dried sludge obtained after sludge drying by the drying machine can be discharged into the gasification furnace through a discharging opening of the drying machine to be gasified, and the dried sludge and hot air flow are recycled, so that the resource utilization rate is increased, and the energy consumption is reduced.

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Description

Technical Field

[0001] The present application relates to the technical field of solid waste treatment, and in particular to a combined gasification, melting and sludge drying system. Background Art

[0002] The sludge produced by the sewage treatment plant has a high moisture content. After mechanical squeezing and dehydration in the sewage treatment plant, the moisture content remains at about 80%, which is not conducive to subsequent landfill, incineration, fermentation and other treatments of the sludge. Therefore, after mechanical squeezing and dehydration, the sludge needs to be further dehydrated, which is generally called sludge drying.

[0003] The commonly used sludge drying method is thermal drying, that is, by providing heat to the sludge, the water in the sludge evaporates to achieve drying.

[0004] The heat source provided for the sludge thermal drying process is generally high-temperature air, and the sludge thermal drying technology requires a large amount of thermal energy, which makes the sludge thermal drying process energy-intensive and has a low resource utilization rate. Utility Model Content

[0005] In view of this, the purpose of the present application is to provide a combined gasification, melting and sludge drying system for reducing the energy consumption of the sludge thermal drying process and improving resource utilization.

[0006] In order to achieve the above technical objectives, the present application provides a combined gasification, melting and sludge drying system, including: a gasifier, a melting furnace and a sludge drying component;

[0007] The sludge drying component comprises: a dryer and a water remover;

[0008] The gas outlet of the gasification furnace is connected to the gas inlet of the melting furnace;

[0009] The air outlet of the melting furnace is connected to the air inlet of the dryer;

[0010] The air outlet of the dryer is connected to the dehumidifier;

[0011] The discharge port of the dryer is connected to the gasification furnace;

[0012] The gas outlet of the dehydrator is connected to the gasifier.

[0013] Further, it also includes a waste heat recovery boiler;

[0014] The gas outlet of the melting furnace is connected to the waste heat recovery boiler;

[0015] The waste heat recovery boiler is connected to the air inlet of the dryer.

[0016] Further, a heat pump is included;

[0017] The waste heat recovery boiler is connected to the heat pump;

[0018] The heat pump is connected to the air inlet of the dryer.

[0019] Further, it also includes a positive pressure fan;

[0020] The heat pump is connected to the air inlet of the dryer through the positive pressure fan.

[0021] Further, a dust collector is included;

[0022] The air outlet of the dryer is connected to the air inlet of the dust collector;

[0023] The air outlet of the dust collector is connected to the water remover.

[0024] Furthermore, the gas outlet of the water remover is also connected to an exhaust pipe;

[0025] The exhaust pipe is provided with a pressure valve.

[0026] Furthermore, an exhaust gas treatment device is provided on the exhaust pipe.

[0027] Further, it also includes an oxygen-enriched generator;

[0028] The oxygen-enriched generator is connected to the gasifier.

[0029] Further, it also includes a hot air furnace;

[0030] The air inlet of the hot blast furnace is connected to the air outlet of the dehumidifier;

[0031] The air outlet of the hot blast stove is connected to the gasification furnace.

[0032] Furthermore, the feed port of the gasifier is connected to a feeder;

[0033] The feed inlet of the dryer is connected with a second feeder.

[0034] It can be seen from the above technical scheme that the present application provides a combined gasification, melting and sludge drying system, including: a gasifier, a melting furnace and a sludge drying component; the sludge drying component includes: a dryer and a dehumidifier; the gas outlet of the gasifier is connected to the air inlet of the melting furnace; the gas outlet of the melting furnace is connected to the air inlet of the dryer; the gas outlet of the dryer is connected to the dehumidifier; the discharge port of the dryer is connected to the gasifier; the gas outlet of the dehumidifier is connected to the gasifier.

[0035] In the combined system of gasification, melting and sludge drying provided by this solution, the hot air flow generated by the gasifier and the melting furnace can be provided to the dryer, so that the heat of the hot air flow can be utilized in the process of drying the sludge by the dryer to improve the utilization rate of energy; at the same time, the dry sludge after the dryer dries the sludge can be discharged to the gasifier through the discharge port of the dryer for gasification. Therefore, through this system, the dry sludge and hot air flow can be recycled in the sludge thermal drying process, thereby effectively improving resource utilization and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] 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.

[0037] Figure 1 A combined system of gasification, melting and sludge drying provided in an embodiment of the present application;

[0038] In the figure: 1. third feeder; 2. gasifier; 3. feeder; 4. melting furnace; 5. waste heat boiler; 6. heat pump; 7. positive pressure fan; 8. second feeder; 9. dryer; 10. dust collector; 11. dehumidifier; 12. hot air furnace; 13. pressure valve; 14. oxygen enrichment generator; 15. tail gas treatment device; 16. exhaust pipe. DETAILED DESCRIPTION

[0039] 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.

[0040] 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.

[0041] 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.

[0042] See also Figure 1 A combined gasification, melting and sludge drying system provided in an embodiment of the present application includes: a gasifier 2, a melting furnace 4 and a sludge drying component. The sludge drying component includes: a dryer 9 and a dehydrator 11.

[0043] The gasifier 2 is used to burn the material. The organic part of the material is gasified to form flue gas, and the inorganic part forms ash and fly ash. The ash gathers at the bottom discharge port of the gasifier 2 and is collected by the collecting device. The gas outlet of the gasifier 2 is connected to the air inlet of the melting furnace 4; the high-temperature flue gas and fly ash enter the melting furnace 4 through the gas outlet of the gasifier 2. The melting furnace further adds air to enable the flue gas to burn completely. Specifically, after the igniter in the melting furnace is started, the flue gas is ignited to cause it to burn completely. The fly ash is molten after high temperature, and is gathered together through the furnace wall, and finally falls into the internal water tank of the quenching conveying device under the melting furnace to form a glassy slag.

[0044] The air outlet of the melting furnace 4 is connected to the air inlet of the dryer 9. The high-temperature air generated by the combustion in the melting furnace 4 leaves the melting furnace 4 through its air outlet and enters the dryer 9, heating the sludge in the dryer 9 to achieve the sludge drying effect. The dryer 9 may be a drum dryer, which has a stirring shaft, and the stirring shaft lifts the sludge and fully contacts it with the high-temperature air, so that the moisture in it is separated in the form of water vapor, thereby achieving the drying effect.

[0045] The air outlet of the dryer 9 is connected to the dehumidifier 11. After the high-temperature air after drying the sludge leaves the air outlet of the dryer 9, it enters the dehumidifier 11 to remove water.

[0046] The air outlet of the dehydrator 11 is connected to the gasifier 2, so that the high-temperature dry air generated after the dehydrator 11 removes water can enter the gasifier 2 for reuse.

[0047] At the same time, the discharge port of the dryer 9 is connected to the gasifier 2; so that the dried sludge can enter the gasifier 2 through the discharge port of the dryer 9 for combustion and gasification, forming a process cycle. Among them, the discharge port of the dryer 9 can be connected to the feed port of the gasifier 2 through the third feeder 1.

[0048] Specifically, the feed port of the dryer 9 is connected to a second feeder 8; the second feeder 8 can be, for example, a screw conveyor, which is used to quantitatively convey sludge to the dryer 9. The feed port of the gasifier 2 can be connected to a feeder 3; the feeder 3 can be, for example, a screw conveyor; since sludge is a low calorific value combustion material, the high calorific value waste raw materials for gasification can be quantitatively conveyed to the gasifier 2 through the feeder 3 to ensure that the gasifier 2 maintains a stable high temperature. The gasifier 2 is used to burn and gasify the sludge and waste raw materials through an igniter. The gasifier 2 can be connected to an oxygen-enriched generator 14; the oxygen-enriched generator 14 is used to provide oxygen to the gasifier 2 to ensure that the oxygen content in the gasifier 2 is maintained within a certain range so that the raw materials in the gasifier 2 are in an incomplete combustion state and continue to burn and gasify.

[0049] In application, a hot blast furnace 12 is also included; the air inlet of the hot blast furnace 12 is connected to the air outlet of the dehydrator 11 ; and the air outlet of the hot blast furnace 12 is connected to the gasification furnace 2 .

[0050] The dehumidifier 11 may be a condensation dehumidifier, which can condense the high-temperature gas discharged from the dryer 9 to remove the water vapor inside. The gas after the water vapor is removed enters the hot blast furnace 12, and after being heated by the hot blast furnace 12, enters the gasifier 2 through the multi-head wind hood; the multi-head wind hood is arranged at the bottom of the gasifier 2, so that the gas entering the gasifier 2 from the multi-head wind hood can lift the material inside the gasifier 2 to increase the contact area.

[0051] In one embodiment, a waste heat recovery boiler 5 is further included; the gas outlet of the melting furnace 4 is connected to the waste heat recovery boiler 5 ; the waste heat recovery boiler 5 is connected to the gas inlet of the dryer 9 .

[0052] The gasifier 2 gasifies solid waste through high-temperature pyrolysis to generate high-temperature synthesis gas, which reaches the melting furnace 4 through a pipeline and is mixed with oxygen for full combustion, with the combustion temperature reaching above 1200°C. The high-temperature gas completely burned in the melting furnace 4 reaches the waste heat recovery boiler 5 through a pipeline, and transfers the carried heat to the waste heat recovery boiler 5; the waste heat recovery boiler 5 uses part of the heat of the high-temperature air to generate electricity, thereby improving the utilization rate of this part of the heat energy.

[0053] Furthermore, it also includes a heat pump 6; the waste heat recovery boiler 5 is connected to the heat pump 6; and the heat pump 6 is connected to the air inlet of the dryer 9.

[0054] The heat pump 6 is arranged between the waste heat recovery boiler 5 and the dryer 9, and is used to remove water from the gas discharged from the waste heat recovery boiler 5 and reduce the temperature of this part of the gas to about 350°C.

[0055] As an implementation manner, the heat pump 6 can be connected to the air inlet of the dryer 9 via the positive pressure fan 7 .

[0056] In one embodiment, a dust collector 10 is further included; the air outlet of the dryer 9 is connected to the air inlet of the dust collector 10; and the air outlet of the dust collector 10 is connected to the water eliminator 11.

[0057] The dust collector 10 may be a nano dust collector or a bag dust collector, and can remove dust from the gas discharged from the dryer 9 .

[0058] In another embodiment, the gas outlet of the water remover 11 is further connected to an exhaust pipe 16 ; the exhaust pipe 16 is provided with a pressure valve 13 .

[0059] Specifically, since the system will continuously add oxygen through the oxygen-enriched generator and continuously add natural gas through the hot blast furnace 12 during the airflow circulation process, the pressure of the system airflow circulation will continue to increase. When the air pressure in the system, specifically the air pressure in the water remover 11, exceeds the preset pressure value, part of the gas can be discharged through the exhaust pipe 16. A pressure transmitter may be provided on the exhaust pipe 16 to detect the air pressure through the pressure transmitter. When the pipeline pressure of the exhaust pipe 16 exceeds the set value, the pressure valve 13 on the branch will open to guide part of the airflow of the airflow circulation system to the branch. The branch has an exhaust gas treatment device 15, which treats the exhaust gas and finally discharges it into the atmosphere through a high-altitude emission chimney.

[0060] The embodiment of the present application provides a combined system of gasification, melting and sludge drying. During the sludge drying process, the required high-temperature air is emptied by the gasifier 2, which reduces the amount of natural gas required for sludge drying, reduces energy consumption and thus reduces the cost of sludge drying. At the same time, most of the harmful substances generated after sludge drying do not require additional processing equipment at the end and can enter the gasifier 2 and melting furnace 4 for decomposition, reducing investment costs and reducing sludge drying costs.

[0061] The dryer 9 can utilize the low-temperature heat energy in the high-temperature gas generated by the gasification furnace 2 and the melting furnace 4, thereby improving resource utilization. At the same time, the full-load operation of the tail gas treatment device is reduced, thereby increasing the service life.

[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 combined system of gasification, melting and sludge drying, characterized in that: include: Gasifier (2), melting furnace (4) and sludge drying component; The sludge drying component comprises: a dryer (9) and a water remover (11); The gas outlet of the gasification furnace (2) is connected to the gas inlet of the melting furnace (4); The air outlet of the melting furnace (4) is connected to the air inlet of the dryer (9); The air outlet of the dryer (9) is connected to the dehumidifier (11); The discharge port of the dryer (9) is connected to the gasification furnace (2); The gas outlet of the dehydrator (11) is connected to the gasifier (2).

2. The combined system of gasification, melting and sludge drying according to claim 1 is characterized in that: Also includes a waste heat recovery boiler (5); The gas outlet of the melting furnace (4) is connected to the waste heat recovery boiler (5); The waste heat recovery boiler (5) is connected to the air inlet of the dryer (9).

3. The combined system of gasification, melting and sludge drying according to claim 2 is characterized in that: Also included is a heat pump (6); The waste heat recovery boiler (5) is connected to the heat pump (6); The heat pump (6) is connected to the air inlet of the dryer (9).

4. The combined gasification, melting and sludge drying system according to claim 3 is characterized in that: Also includes a positive pressure fan (7); The heat pump (6) is connected to the air inlet of the dryer (9) via the positive pressure fan (7).

5. The combined system of gasification, melting and sludge drying according to claim 1 is characterized in that: Also includes a dust collector (10); The air outlet of the dryer (9) is connected to the air inlet of the dust collector (10); The air outlet of the dust collector (10) is connected to the water remover (11).

6. The combined system of gasification, melting and sludge drying according to claim 1 is characterized in that: The gas outlet of the dehydrator (11) is also connected to an exhaust pipe (16); The exhaust pipe (16) is provided with a pressure valve (13).

7. The combined system of gasification, melting and sludge drying according to claim 6 is characterized in that: An exhaust gas treatment device (15) is provided on the exhaust pipe (16).

8. The combined system of gasification, melting and sludge drying according to claim 1 is characterized in that: Also included is an oxygen enrichment generator (14); The oxygen-enriched generator (14) is connected to the gasifier (2).

9. The combined system of gasification, melting and sludge drying according to claim 1 is characterized in that: Also includes a hot air stove (12); The air inlet of the hot blast furnace (12) is connected to the air outlet of the dehydrator (11); The gas outlet of the hot blast furnace (12) is connected to the gasification furnace (2).

10. The combined system of gasification, melting and sludge drying according to claim 1, characterized in that: The feed inlet of the gasifier (2) is connected to a feeder (3); The feed port of the dryer (9) is connected to a second feeder (8).