Organic solid waste smoldering treatment system and method

Abstract

The application discloses a kind of organic solid waste smoldering treatment system and method, the organic solid waste smoldering treatment system includes: smoldering furnace, gas supply component, condensing device, flue gas treatment component, flue gas compression device and liquid carbon dioxide storage tank, smoldering furnace has feed end and discharge end, smoldering furnace includes bottom furnace part, outer furnace part and top furnace part, bottom furnace part and outer furnace part are equipped with gas inlet, top furnace part is equipped with flue gas outlet, gas supply component is connected with multiple gas inlets, flue gas outlet is connected with condensing device, condensing device is connected with flue gas treatment component, flue gas treatment component is connected with flue gas compression device, flue gas compression device is connected with smoldering furnace and liquid carbon dioxide storage tank.The gas flow of smoldering furnace is adjusted, the control of organic solid waste combustion degree is realized, and organic solid waste is fully combusted.And, combustible gas in smoldering tail gas is re-input into smoldering furnace, effectively utilize the calorific value in tail gas, improve the smoldering treatment efficiency of solid waste and system stability.

Description

Technical Field

[0001] This invention relates to the field of waste disposal technology, and in particular to a system and method for treating smoldering organic solid waste. Background Technology

[0002] Organic solid waste, such as municipal solid waste, sewage sludge, and oily sludge, while possessing high calorific value, also contains toxic and harmful substances such as heavy metals, pathogens, surfactants, and polycyclic aromatic hydrocarbons. Among related technologies, the main methods for disposing of organic solid waste include biological treatment, landfill, and drying incineration. Drying incineration, due to its thorough treatment and high efficiency, is currently the most widely used solid waste disposal technology. However, the drying incineration process also suffers from drawbacks such as high energy consumption and severe pollution. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention propose an organic solid waste smoldering treatment system, which features low energy consumption, safety and efficiency, and flexible treatment.

[0005] Embodiments of the present invention also propose a method for treating smoldering organic solid waste using the above-described organic solid waste smoldering treatment system.

[0006] The organic solid waste smoldering treatment system of this invention includes: a smoldering furnace, a gas supply assembly, a condensation device, a flue gas treatment assembly, a flue gas compression device, and a liquid carbon dioxide storage tank. The smoldering furnace has a feed end and a discharge end. The smoldering furnace includes a bottom furnace section, an outer furnace section, and a top furnace section connected sequentially in a vertical direction. The cross-sectional area of ​​the bottom furnace section and the top furnace section is smaller than that of the outer furnace section. Air inlets are provided on the lower end faces of the bottom furnace section and the outer furnace section. A flue gas outlet is provided on the top furnace section. The gas supply assembly is connected to multiple... The air inlet is connected to the exhaust port, the exhaust port is connected to the input end of the condensing device via a pipeline, the output end of the condensing device is connected to the input end of the flue gas treatment component via a pipeline, the flue gas treatment component is used for flue gas desulfurization, denitrification and dust removal treatment, the flue gas compression device has a gas input end, a gas output end and a liquid output end, the output end of the flue gas treatment component is connected to the gas input end via a pipeline, the gas output end is connected to the smoldering furnace via a pipeline, and the liquid output end is connected to the liquid carbon dioxide storage tank via a pipeline.

[0007] The organic solid waste smoldering treatment system of this invention controls the degree of combustion of organic solid waste in the smoldering furnace by adjusting the air inlet flow rate, ensuring complete combustion of the organic solid waste. Furthermore, by re-introducing combustible gases from the smoldering exhaust gas into the furnace, the calorific value of the exhaust gas is effectively utilized, improving the smoldering treatment efficiency and system stability of solid waste.

[0008] In some embodiments, the outer furnace section is provided with an outer furnace air distribution plate, which is connected to the air inlet on the outer furnace section; the bottom furnace section is provided with a bottom furnace air distribution plate, which is connected to the air inlet on the bottom furnace section.

[0009] In some embodiments, there are multiple feeding ends, which are respectively located on the top furnace section and the outer furnace section, and there are multiple unloading ends, which are respectively located on the bottom furnace section and the outer furnace section.

[0010] In some embodiments, the air supply assembly includes a fan, a plurality of regulating switches, and a plurality of air heaters. The fan is connected to a plurality of air inlets via pipelines, and each pipeline connecting the fan to any of the air inlets is provided with a regulating switch and an air heater.

[0011] In some embodiments, the gas output terminal is connected to the pipeline between the fan and the regulating switch.

[0012] In some embodiments, the flue gas treatment assembly includes a dry desulfurization device and an integrated denitrification and dust removal device. The output end of the condensation device is connected to the input end of the dry desulfurization device via a pipeline. The output end of the dry desulfurization device is connected to the input end of the integrated denitrification and dust removal device via a pipeline. The output end of the integrated denitrification and dust removal device is connected to the gas input end via a pipeline.

[0013] The present invention discloses a method for treating smoldering organic solid waste, which is used in the smoldering organic solid waste treatment system described in any of the above embodiments. The method includes: thoroughly mixing organic solid waste and medium sand at a ratio of 3:1, and then adding the mixture to the smoldering furnace through the feed end; introducing hot air into the smoldering furnace through the air supply component, and after the temperature inside the smoldering furnace reaches a preset value, introducing room temperature air into the smoldering furnace through the air supply component to cause smoldering of the organic solid waste; conveying the flue gas generated by smoldering in the smoldering furnace to the condensing device for cooling through the exhaust port, and then conveying the cooled flue gas to the flue gas treatment device for desulfurization, denitrification, and dust removal; conveying the flue gas after desulfurization, denitrification, and dust removal to the flue gas compression device for compression, conveying the liquid carbon dioxide generated by compression to the liquid carbon dioxide storage tank for storage, and conveying the remaining combustible gas from compression back to the smoldering furnace.

[0014] In some embodiments, the preset temperature of the smoldering furnace is 500°C.

[0015] In some embodiments, during the flue gas cooling process, the temperature of the condensation device is set to 30-50°C.

[0016] In some embodiments, during the flue gas compression process, the operating conditions of the flue gas compression device are set to a pressure of 7.40 MPa and a temperature of 30°C. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an organic solid waste smoldering treatment system according to an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the smoldering furnace of the smoldering treatment system for organic solid waste according to an embodiment of the present invention.

[0019] Figure label:

[0020] Smoldering furnace 1, bottom furnace section 11, bottom furnace air distribution plate 111, outer furnace section 12, outer furnace air distribution plate 121, top furnace section 13, feeding end 101, unloading end 102.

[0021] Air supply assembly 2, fan 21, regulating switch 22, air heater 23

[0022] 3. Condensation unit; 4. Dry desulfurization equipment; 5. Integrated denitrification and dust removal equipment; 6. Flue gas compression unit; 7. Liquid carbon dioxide storage tank. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] The organic solid waste smoldering treatment system of the present invention is described below with reference to the accompanying drawings.

[0025] like Figure 1 and Figure 2 As shown, the organic solid waste smoldering treatment system of this invention includes: a smoldering furnace 1, a gas supply component 2, a condensation device 3, a flue gas treatment component, a flue gas compression device 6, and a liquid carbon dioxide storage tank 7.

[0026] The smoldering furnace 1 has a feed end 101 and a discharge end 102. The smoldering furnace 1 includes a bottom furnace section 11, an outer furnace section 12, and a top furnace section 13 connected sequentially in a vertical direction. The cross-sectional areas of the bottom furnace section 11 and the top furnace section 13 are both smaller than the cross-sectional area of ​​the outer furnace section 12. Air inlets are provided on the lower end faces of both the bottom furnace section 11 and the outer furnace section 12, and a flue gas outlet is provided on the top furnace section 13. The gas supply assembly 2 is connected to multiple air inlets via pipelines. The flue gas outlet is connected to the input end of the condensing device 3 via pipelines. The output end of the condensing device 3 is connected to the input end of the flue gas treatment assembly via pipelines. The flue gas treatment assembly is used for desulfurization, denitrification, and dust removal of the flue gas. The flue gas compression device 6 has a gas input end, a gas output end, and a liquid output end. The output end of the flue gas treatment assembly is connected to the gas input end via pipelines. The gas output end is connected to the smoldering furnace 1 via pipelines, and the liquid output end is connected to the liquid carbon dioxide storage tank 7 via pipelines.

[0027] The organic solid waste smoldering treatment system of this invention employs smoldering treatment technology, which involves homogenizing organic solid waste with a porous medium and then using a smoldering furnace 1 to achieve self-sustaining smoldering treatment of the organic solid waste. Compared with related technologies such as drying and incineration, smoldering treatment technology has the advantages of low energy consumption, safety, high efficiency, and flexible treatment.

[0028] Optionally, the smoldering furnace 1 is cylindrical in shape and is constructed by sequentially wrapping it with refractory bricks, insulating cotton, and stainless steel. From bottom to top, the smoldering furnace 1 consists of a bottom furnace section 11, an outer furnace section 12, and a top furnace section 13. The bottom furnace section 11 and the top furnace section 13 have the same cross-sectional area, but the cross-sectional area of ​​the bottom furnace section 11 is smaller than that of the top furnace section 13.

[0029] Understandably, organic solid waste is fed into the smoldering furnace 1 through the feed end 101, and the smoldering organic solid waste is discharged from the smoldering furnace 1 through the discharge end 102. The gas supply device ventilates the smoldering furnace 1 through the air inlet (hot air or ambient temperature air), and the high-temperature flue gas generated by smoldering is discharged through the flue gas outlet. The high-temperature flue gas is transported to the condenser 3 for cooling, and the cooled flue gas is then treated by the flue gas treatment device for desulfurization, denitrification and dust removal before being transported to the flue gas compression device 6 for compression. The liquid carbon dioxide obtained from the compression is transported to the liquid carbon dioxide storage tank 7 for storage, and the remaining combustible gases (methane, carbon monoxide) from the compression are reintroduced into the smoldering furnace 1, thereby recovering the calorific value of the combustible gases.

[0030] The flue gas compression device 6 utilizes the different critical temperatures and critical pressures of different gases to capture carbon dioxide in the smoldering exhaust gas. Furthermore, during the smoldering treatment of organic solid waste in the smoldering furnace 1, the air intake flow rate can be adjusted via the gas supply device, and organic solid waste can be added at the feed end 101 as needed to control the degree of combustion of organic solid waste in the smoldering furnace 1, thereby achieving complete treatment of the organic solid waste.

[0031] For ease of description, the air inlet on the outer furnace section 12 is referred to as the outer furnace air inlet, and the air inlet on the bottom furnace section 11 is referred to as the bottom furnace air inlet. There are multiple outer furnace air inlets, which are distributed circumferentially around the lower end face of the outer furnace section 12 and close to its edge. The bottom furnace air inlet is located at the center of the bottom furnace section 11. Thus, by providing multiple air inlets, it is further ensured that the organic solid waste inside the smoldering furnace 1, especially near the edge of the smoldering furnace 1, is completely burned.

[0032] Therefore, the organic solid waste smoldering treatment system of this embodiment controls the degree of combustion of organic solid waste in the smoldering furnace 1 by adjusting the air inlet flow rate of the smoldering furnace 1, ensuring complete combustion of the organic solid waste in the smoldering furnace 1. Furthermore, by re-introducing the combustible gases from the smoldering exhaust gas into the smoldering furnace 1, the calorific value of the exhaust gas is effectively utilized, improving the smoldering treatment efficiency of solid waste and the system stability.

[0033] In some embodiments, such as Figure 1 and Figure 2 As shown, the outer furnace section 12 is provided with an outer furnace air distribution plate 121, which is connected to the air inlet on the outer furnace section 12. The bottom furnace section 11 is provided with a bottom furnace air distribution plate 111, which is connected to the air inlet on the bottom furnace section 11.

[0034] Optionally, the outer furnace air distribution plate 121 is annular, and the size of the central through hole of the outer furnace air distribution plate 121 is the same as the size of the opening at the connection between the bottom furnace part 11 and the outer furnace part 12. The outer furnace air distribution plate 121 is located at the bottom of the outer furnace part 12, and the bottom furnace air distribution plate 111 is located at the bottom of the bottom furnace part 11. Both the outer furnace air distribution plate 121 and the bottom furnace air distribution plate 111 are used to support the material added to the smoldering furnace 1 and to evenly distribute the air transported to the smoldering furnace 1 through the air inlet.

[0035] In some embodiments, such as Figure 1 and Figure 2 As shown, there are multiple feeding ends 101, which are located on the top furnace section 13 and the outer furnace section 12, respectively. There are also multiple unloading ends 102, which are located on the bottom furnace section 11 and the outer furnace section 12, respectively. Thus, by providing multiple feeding ends 101 and unloading ends 102, the feeding efficiency and discharge efficiency are improved.

[0036] In some embodiments, such as Figure 1 As shown, the air supply assembly 2 includes a fan 21, multiple regulating switches 22, and multiple air heaters 23. The fan 21 is connected to multiple air inlets via pipelines. Each pipeline connecting the fan 21 to any air inlet is equipped with a regulating switch 22 and an air heater 23.

[0037] The regulating switch 22 is used to control the opening and closing of the pipeline between the blower 21 and the air inlet, as well as the air intake flow rate. The air heater 23 is used to heat the air delivered by the blower 21 to the combustion furnace 1. There are multiple air intake pipelines between the blower 21 and multiple air inlets, and each air intake pipeline is equipped with a regulating switch 22 and an air heater 23.

[0038] In some embodiments, such as Figure 1 As shown, the gas output end is connected to the pipeline between the blower 21 and the regulating switch 22, so that the regulating switch 22 controls the flow rate of combustible gas delivered by the flue gas compression device 6 to the smoldering furnace 1.

[0039] In some embodiments, the flue gas treatment assembly includes a dry desulfurization device 4 and an integrated denitrification and dust removal device 5. The output end of the condensation device 3 is connected to the input end of the dry desulfurization device 4 via a pipeline, the output end of the dry desulfurization device 4 is connected to the input end of the integrated denitrification and dust removal device 5 via a pipeline, and the output end of the integrated denitrification and dust removal device 5 is connected to the gas input end via a pipeline.

[0040] The following describes a method for treating smoldering organic solid waste according to an embodiment of the present invention.

[0041] The organic solid waste smoldering treatment method of this invention, used in the organic solid waste smoldering treatment system of any of the above embodiments, includes: thoroughly mixing organic solid waste and medium sand at a ratio of 3:1, and then adding the mixture into the smoldering furnace 1 through the feed end 101. Hot air is introduced into the smoldering furnace 1 by the air supply component 2, and after the temperature inside the smoldering furnace 1 reaches a preset value, ambient temperature air is introduced into the smoldering furnace 1 to cause smoldering of the organic solid waste. The flue gas generated by smoldering in the smoldering furnace 1 is transported to the condensing device 3 through the exhaust port for cooling, and the cooled flue gas is transported to the flue gas treatment device for desulfurization, denitrification, and dust removal. The flue gas after desulfurization, denitrification, and dust removal is transported to the flue gas compression device 6 for compression, and the liquid carbon dioxide generated by the compression is transported to the liquid carbon dioxide storage tank 7 for storage. The remaining combustible gas after compression is transported back to the smoldering furnace 1.

[0042] In some embodiments, the preset temperature of the smoldering furnace 1 is 500°C.

[0043] In some embodiments, during the flue gas cooling process, the temperature of the condenser 3 is set to 30-50°C. During the flue gas compression process, the operating conditions of the flue gas compression device 6 are set to a pressure of 7.40 MPa and a temperature of 30°C.

[0044] In summary, specifically, firstly, organic solid waste and medium sand are thoroughly mixed at a ratio of 3:1, and then fed into the smoldering furnace 1 through the feed ends 101 on the top furnace section 13 and the outer furnace section 12, respectively. Then, the regulating switches 22 and air heaters 23 on each air inlet pipe are opened, and the blower 21 introduces hot air into the smoldering furnace 1 through the air heaters 23. After the temperature inside the smoldering furnace 1 reaches 500°C, the air heaters 23 are turned off, and room temperature air is introduced into the smoldering furnace 1 to cause the organic solid waste to smolder.

[0045] During the treatment process in the smoldering furnace 1, the air intake flow of the smoldering furnace 1 can be controlled by adjusting switch 22, and organic solid waste can be added in a timely manner to control the degree of combustion of organic solid waste in the smoldering furnace 1, so as to achieve complete treatment of organic solid waste. After the treatment is completed, the waste is unloaded through unloading end 102.

[0046] The flue gas generated during the smoldering process is discharged through the exhaust port and sequentially processed by a condenser 3, a dry desulfurization unit 4, an integrated denitrification and dust removal unit 5, and a flue gas compression unit 6. The liquid carbon dioxide obtained from the compression process is transported to a liquid carbon dioxide storage tank 7 for storage. The remaining combustible gas after compression is reintroduced into the smoldering furnace 1. The temperature of the condenser 3 is controlled between 30-50℃, and the operating conditions of the flue gas compression unit 6 are set at a pressure of 7.40 MPa and a temperature of 30℃.

[0047] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0052] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. An organic solid waste smoldering treatment system, characterized in that, include: A smoldering furnace has a feeding end and a discharging end. The smoldering furnace includes a bottom furnace section, an outer furnace section, and a top furnace section that are connected in sequence along the vertical direction. The cross-sectional area of ​​the bottom furnace section and the top furnace section is smaller than that of the outer furnace section. The lower end face of the bottom furnace section and the lower end face of the outer furnace section are provided with air inlets, and the top furnace section is provided with flue gas outlets. An air supply assembly includes a fan, multiple regulating switches, and multiple air heaters. The fan is connected to multiple air inlets via pipelines. Each pipeline connecting the fan to any of the air inlets is equipped with a regulating switch and an air heater. The regulating switch is used to control the on / off state of the pipeline between the fan and the air inlets and the air intake flow rate. A condensing device, wherein the exhaust port is connected to the input end of the condensing device via a pipeline; A flue gas treatment assembly, wherein the output end of the condensing device is connected to the input end of the flue gas treatment assembly via a pipeline, and the flue gas treatment assembly is used for flue gas desulfurization, denitrification and dust removal treatment; A flue gas compression device has a gas input end, a gas output end and a liquid output end. The output end of the flue gas treatment component is connected to the gas input end via a pipeline, and the gas output end is connected to the smoldering furnace via a pipeline. A liquid carbon dioxide storage tank, wherein the liquid output end is connected to the liquid carbon dioxide storage tank via a pipeline.

2. The organic solid waste smoldering treatment system according to claim 1, characterized in that, The outer furnace section is provided with an outer furnace air distribution plate, which is connected to the air inlet on the outer furnace section. The bottom furnace section is provided with a bottom furnace air distribution plate, which is connected to the air inlet on the bottom furnace section.

3. The organic solid waste smoldering treatment system according to claim 1, characterized in that, The feeding end has multiple feeding ends, which are respectively located on the top furnace section and the outer furnace section. The unloading end has multiple unloading ends, which are respectively located on the bottom furnace section and the outer furnace section.

4. The organic solid waste smoldering treatment system according to claim 1, characterized in that, The gas output terminal is connected to the pipeline between the fan and the regulating switch.

5. The organic solid waste smoldering treatment system according to claim 1, characterized in that, The flue gas treatment assembly includes a dry desulfurization device and an integrated denitrification and dust removal device. The output end of the condensation device is connected to the input end of the dry desulfurization device via a pipeline. The output end of the dry desulfurization device is connected to the input end of the integrated denitrification and dust removal device via a pipeline. The output end of the integrated denitrification and dust removal device is connected to the gas input end via a pipeline.

6. A method for treating smoldering organic solid waste, characterized in that, The method is used in the organic solid waste smoldering treatment system as described in any one of claims 1-5, the method comprising: Organic solid waste and medium sand are thoroughly mixed in a 3:1 ratio and then fed into the smoldering furnace through the feed end. The gas supply component introduces hot air into the smoldering furnace. After the temperature inside the smoldering furnace reaches a preset value, the gas supply component introduces room temperature air into the smoldering furnace to cause the organic solid waste to smolder. The flue gas generated by smoldering in the smoldering furnace is transported to the condensing device through the flue gas outlet for cooling and temperature reduction. The cooled flue gas is then transported to the flue gas treatment component for desulfurization, denitrification and dust removal treatment. The flue gas after desulfurization, denitrification and dust removal is transported to the flue gas compression device for compression. The liquid carbon dioxide produced by the compression is transported to the liquid carbon dioxide storage tank for storage. The remaining combustible gas after compression is transported back to the smoldering furnace.

7. The method for treating smoldering organic solid waste according to claim 6, characterized in that, The preset temperature of the smoldering furnace is 500°C.

8. The method for treating smoldering organic solid waste according to claim 7, characterized in that, During the flue gas cooling process, the temperature of the condensation device is set to 30-50℃.

9. The method for treating smoldering organic solid waste according to claim 8, characterized in that, During the flue gas compression process, the operating conditions of the flue gas compression device are set to a pressure of 7.40 MPa and a temperature of 30°C.

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