Desulfurization system

Abstract

The utility model belongs to solid waste resource utilization technical field, concretely relates to a desulfurization system. The desulfurization system includes: first conveying assembly, drying assembly includes drying -machine, air -blower, hot blast furnace and first dust catcher, and the feed inlet of drying -machine communicates with first conveying assembly, and air -blower communicates with hot blast furnace, and hot blast furnace communicates with the air inlet of drying -machine, and first dust catcher communicates with the air outlet of drying -machine, second conveying assembly communicates with the discharge opening of drying -machine, storage bin communicates with second conveying assembly, third conveying assembly communicates with storage bin. The desulfurization system of the application can be recovered and utilized to causticizing residue.

Description

Technical Field

[0001] This application belongs to the field of solid waste resource utilization technology, specifically relating to a desulfurization system. Background Technology

[0002] Causticizing slag is a solid waste generated during alumina production, mainly containing calcium carbonate, calcium hydroxide, and sodium carbonate. As a highly alkaline calcium-based solid waste, causticizing slag has not yet been utilized as a resource due to the lack of economically viable technologies.

[0003] In related technologies, caustic slag is a general solid waste, and its stockpiling and disposal results in a waste of resources. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a desulfurization system, which aims to at least partially solve the technical problem of resource waste caused by the stockpiling and processing of causticizing slag, which is considered general solid waste.

[0005] The technical solution of this utility model is as follows: A desulfurization system includes: a first conveying assembly; a drying assembly including a dryer, a blower, a hot air furnace, and a first dust collector, wherein the feed inlet of the dryer is connected to the first conveying assembly, the blower is connected to the hot air furnace, the hot air furnace is connected to the air inlet of the dryer, and the first dust collector is connected to the air outlet of the dryer; a second conveying assembly connected to the discharge outlet of the dryer; a storage bin connected to the second conveying assembly; and a third conveying assembly connected to the storage bin.

[0006] In some embodiments, the first conveying assembly includes: a hopper; a first metering feeder located below the hopper; a first bucket elevator with its inlet located below and connected to the outlet of the first metering feeder; a buffer hopper located below and connected to the outlet of the first bucket elevator; and a second metering feeder located below the buffer hopper and connected to the inlet of the dryer; wherein the inlet of the first bucket elevator is located below and connected to the first metering feeder, and the outlet of the bucket elevator is located above and connected to the buffer hopper.

[0007] In some implementations, the first conveying assembly further includes: a first level gauge disposed in the hopper; and a second level gauge disposed in the buffer hopper.

[0008] In some embodiments, the drying assembly further includes an induced draft fan connected in communication with the first dust collector.

[0009] In some embodiments, the second conveying assembly includes: a second bucket elevator, the inlet of which is connected to the outlet of the dryer, and the outlet of the second bucket elevator being connected to the storage bin.

[0010] In some embodiments, the first dust collector has an openable and closable opening, in which the first dust collector is in communication with the storage bin when the opening is open.

[0011] In some implementations, the desulfurization system further includes a screw conveyor located at the first dust collector and connected to the opening and the storage silo.

[0012] In some implementations, the desulfurization system further includes: a second dust collector located at the top of the storage silo; and an exhaust fan connected to the second dust collector.

[0013] In some implementations, the desulfurization system further includes a third level gauge located in the storage silo.

[0014] In some embodiments, the third conveying assembly includes: a receiving hopper located below the storage bin and in sealed communication with the storage bin; a material sealing pump located below the receiving hopper, the inlet of the material sealing pump being in communication with the receiving hopper; and a blower connected to the air inlet of the material sealing pump; wherein the inlet of the material sealing pump is located between the air inlet and the outlet of the material sealing pump.

[0015] The beneficial effects of this utility model include at least the following: The drying assembly includes a dryer, a blower, a hot air furnace, and a first dust collector. The dryer's inlet is connected to the first conveying assembly, the blower is connected to the hot air furnace, the hot air furnace is connected to the dryer's inlet, and the first dust collector is connected to the dryer's outlet. Therefore, the first conveying assembly feeds the causticized slag with a moisture content of less than 20% into the dryer through the dryer's inlet. Simultaneously, the hot air blower is activated, sending high-temperature gas from the hot air furnace into the dryer through the dryer's inlet to dry the causticized slag until a dry causticized slag with a moisture content of <2% is obtained. During the drying process, dust is generated. The dust and the heat-exchanged gas enter the first dust collector for dust removal, ensuring that the discharged gas is purified flue gas, preventing pollution, and guaranteeing environmental safety.

[0016] Since the second conveying component is connected to the discharge port of the dryer and the storage bin is connected to the second conveying component, the dried causticized slag can reach the second conveying component through the discharge port of the dryer. The second conveying component can then transport the dried causticized slag to the storage bin for storage.

[0017] Since the third conveying component is connected to the storage silo, it can transport the dried caustic slag in the storage silo to the high-temperature furnace of the boiler for flue gas desulfurization. The caustic slag, which is a solid waste, is used as a flue gas desulfurizing agent, thus treating waste with waste and realizing the recycling of caustic slag, reducing costs and protecting the environment.

[0018] Compared to limestone, causticizing slag not only contains calcium carbonate but also calcium hydroxide and sodium carbonate. Sodium carbonate, as an alkaline desulfurizing agent, can directly react with sulfur dioxide in flue gas, resulting in higher desulfurization efficiency than limestone. Drying the raw causticizing slag allows it to replace limestone as a desulfurizing agent for calcium injection in the high-temperature furnace of boilers. This utilizes the causticizing slag to remove carbon dioxide from flue gas while simultaneously achieving resource utilization, reducing causticizing slag storage costs, lowering limestone consumption, and further reducing the company's desulfurization operating costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the desulfurization system in some embodiments.

[0021] In the attached image: First conveying assembly 10, hopper 11, first quantitative feeder 12, first bucket elevator 13, buffer silo 14, second quantitative feeder 15, first level gauge 16, second level gauge 17; drying assembly 20, dryer 21, blower 22, hot air furnace 23, first dust collector 24, induced draft fan 25; second conveying assembly 30, second bucket elevator 31; storage silo 40; third conveying assembly 50, receiving hopper 51, material sealing pump 52, blower 53; screw conveyor 60; second dust collector 70; exhaust fan 80; third level gauge 90; boiler 100. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that all directional indications in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean 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 utility model according to the specific circumstances.

[0025] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0026] In related technologies, calcium injection into the high-temperature furnace of boilers uses limestone as a desulfurizing agent. Limestone is fed into the high-temperature furnace, where it decomposes into calcium oxide at high temperatures. This calcium oxide reacts with carbon dioxide in the flue gas to form calcium sulfate, which enters the ash slag, thus removing sulfur dioxide. Limestone, as a resource, requires significant manpower and resources at each stage from mining to product utilization, increasing energy consumption and carbon emissions. Causticizing slag, on the other hand, is an alkaline, calcium-containing solid waste discharged from alumina plants. It is the filter residue after liquid-solid separation of causticizing slurry and has a high water content. The main component of causticizing slag is calcium carbonate, and it also contains calcium hydroxide and sodium carbonate carried over from the water. However, causticizing slag is considered general solid waste, and stockpiling it would result in resource waste.

[0027] Based on these technical problems, this application provides a desulfurization system aimed at solving the technical problem that caustic slag is a general solid waste and that stockpiling and processing it results in resource waste.

[0028] The design concept of this application is to transport the dried caustic slag to the high-temperature furnace of the boiler for flue gas desulfurization, and use the caustic slag, which is a solid waste, as a flue gas desulfurizing agent, thereby achieving the technical effect of treating waste with waste, recycling caustic slag, reducing costs, and protecting the environment.

[0029] Specific technical solutions will now be described in detail with reference to the accompanying drawings, which are not necessarily drawn to scale. Similar or identical reference numerals may be used to designate the same or similar parts in different figures. The use of similar or identical reference numerals in different figures does not mean that all figures including similar or identical reference numerals constitute a single or the same embodiment. The accompanying drawings illustrate the various embodiments discussed in this application in a generalized, illustrative, and not restrictive manner.

[0030] Combination Figure 1 The desulfurization system in this embodiment includes: a first conveying assembly 10, a drying assembly 20, a second conveying assembly 30, a storage bin 40, and a third conveying assembly 50. The drying assembly 20 includes a dryer 21, a blower 22, a hot air furnace 23, and a first dust collector 24. The feed inlet of the dryer 21 is connected to the first conveying assembly 10; the blower 22 is connected to the hot air furnace 23; the hot air furnace 23 is connected to the air inlet of the dryer 21; and the first dust collector 24 is connected to the air outlet of the dryer 21. The second conveying assembly 30 is connected to the discharge outlet of the dryer 21. The storage bin 40 is connected to the second conveying assembly 30. The third conveying assembly 50 is connected to the storage bin 40.

[0031] Since the drying assembly 20 includes a dryer 21, a blower 22, a hot air furnace 23, and a first dust collector 24, the feed inlet of the dryer 21 is connected to the first conveying assembly 10, the blower 22 is connected to the hot air furnace 23, the hot air furnace 23 is connected to the air inlet of the dryer 21, and the first dust collector 24 is connected to the air outlet of the dryer 21, the first conveying assembly 10 feeds the raw material causticized slag with a moisture content of less than 20% into the dryer 21 through the feed inlet of the dryer 21. At the same time, the hot air blower is started, and the hot air blower sends the high-temperature gas in the hot air furnace 23 into the dryer 21 through the air inlet of the dryer 21 to dry the raw material causticized slag until a dried causticized slag with a moisture content of <2% is obtained. When the high-temperature gas dries the raw material caustic slag in the dryer 21, dust will be generated. The dust and the gas after heat exchange enter the first dust collector 24 for dust removal to ensure that the discharged gas is purified flue gas, avoid pollution, and ensure environmental safety.

[0032] Since the second conveying component 30 is connected to the discharge port of the dryer 21 and the storage bin 40 is connected to the second conveying component 30, the dried causticized slag can reach the second conveying component 30 through the discharge port of the dryer 21. The second conveying component 30 can transport the dried causticized slag to the storage bin 40 for storage.

[0033] Since the third conveying component 50 is connected to the storage bin 40, the third conveying component 50 can transport the dried caustic slag in the storage bin 40 to the high-temperature furnace of the boiler 100 for flue gas desulfurization. The caustic slag, which is a solid waste, is used as a flue gas desulfurizing agent, thus treating waste with waste and realizing the recycling of caustic slag, reducing costs and protecting the environment.

[0034] Compared to limestone, causticizing slag not only contains calcium carbonate but also calcium hydroxide and sodium carbonate. Sodium carbonate, as an alkaline desulfurizing agent, can directly react with sulfur dioxide in flue gas, resulting in higher desulfurization efficiency than limestone. Drying the raw causticizing slag allows it to replace limestone as a desulfurizing agent for calcium injection in the high-temperature furnace of a boiler (100°C). This utilizes the causticizing slag to remove carbon dioxide from the flue gas, achieving resource utilization of the slag, reducing causticizing slag storage costs, lowering limestone consumption, and further reducing the company's desulfurization operating costs.

[0035] In some embodiments, the hot air furnace 23 is fueled by natural gas.

[0036] In some embodiments, the drying temperature of the dryer 21 is 120°C to 150°C.

[0037] In some embodiments, the causticizing slag contains 80% to 90% calcium carbonate, 5% to 10% calcium hydroxide, 2% to 8% sodium carbonate, and some other impurities.

[0038] Combination Figure 1 In some embodiments, to convey causticized slag with a moisture content of less than 20% to the dryer 21, the first conveying assembly 10 includes: a hopper 11, a first quantitative feeder 12, a first bucket elevator 13, a buffer bin 14, and a second quantitative feeder 15. The first quantitative feeder 12 is located below the hopper 11. The inlet of the first bucket elevator 13 is located below and communicates with the outlet of the first quantitative feeder 12. The buffer bin 14 is located below and communicates with the outlet of the first bucket elevator 13. The second quantitative feeder 15 is located below the buffer bin 14 and communicates with the inlet of the dryer 21.

[0039] Raw material causticizing slag with a moisture content of less than 20% enters the feeding hopper 11. The feeding hopper 11 conveys the raw material causticizing slag to the first quantitative feeder 12. The discharge port of the first quantitative feeder 12 conveys the raw material causticizing slag to the feed port of the first bucket elevator 13. The buffer bin 14 is located above the discharge port of the first bucket elevator 13 and is connected to the discharge port of the first bucket elevator 13. The first bucket elevator 13 conveys the raw material causticizing slag to the buffer bin 14 for buffering. The buffered raw material causticizing slag enters the dryer 21 through the feed port of the second quantitative feeder 15 and the dryer 21.

[0040] Combination Figure 1 In some embodiments, the first conveying assembly 10 further includes a first level gauge 16. The first level gauge 16 is disposed in the hopper 11 and is used to detect the material level in the hopper 11, so as to prevent the raw material caustic slag in the hopper 11 from overflowing due to excessive amount, and to ensure the normal conveying of the raw material caustic slag.

[0041] In some embodiments, the first conveying assembly 10 further includes a second level gauge 17. The second level gauge 17 is disposed in the buffer hopper 14 and is used to detect the material level in the buffer hopper 14 to prevent excessive caustic slag in the buffer hopper 14 from overflowing, thus ensuring the normal conveying of the caustic slag.

[0042] Combination Figure 1 In some embodiments, to ensure that the dust in the dryer 21 can enter the first dust collector 24, the drying assembly 20 further includes an induced draft fan 25. The induced draft fan 25 is connected to the first dust collector 24, and the dust in the dryer 21 is guided into the first dust collector 24 by the induced draft fan 25.

[0043] Combination Figure 1 In some embodiments, in order to convey the dried causticized slag to the storage bin 40, the second conveying assembly 30 includes a second bucket elevator 31. The inlet of the second bucket elevator 31 is connected to the outlet of the dryer 21, and the outlet of the second bucket elevator 31 is connected to the storage bin 40.

[0044] The dried caustic slag is conveyed to the second bucket elevator 31. The inlet of the second bucket elevator 31 is connected to the outlet of the dryer 21. The outlet of the second bucket elevator 31 is located above the storage bin 40 and is connected to the storage bin 40. The second bucket elevator 31 conveys the dried caustic slag to the storage bin 40 and buffers it through the buffer bin 14.

[0045] In some embodiments, in order to make full use of the causticized slag, the first dust collector 24 has an openable and closable opening, and when the opening is open, the first dust collector 24 is in communication with the storage bin 40.

[0046] When the first dust collector 24 collects enough caustic slag dust, it opens the opening, and the caustic slag dust reaches the storage bin 40 through the opening, thus realizing the utilization of the caustic slag dust.

[0047] Combination Figure 1 In some embodiments, in order to convey the dust from the first dust collector 24 to the storage silo 40, the desulfurization system further includes a screw conveyor 60. The screw conveyor 60 is located in the first dust collector 24 and communicates with the opening and the storage silo 40.

[0048] When the opening is open, the screw conveyor 60 is started, and the screw conveyor 60 transports the caustic slag dust collected by the first dust collector 24 to the storage bin 40.

[0049] Combination Figure 1 In some embodiments, dust is generated when the dried causticized slag enters the storage silo 40. To collect this dust, the desulfurization system further includes a second dust collector 70 and an exhaust fan 80. The second dust collector 70 is located at the top of the storage silo 40. The exhaust fan 80 is connected to the second dust collector 70.

[0050] When the dried caustic slag enters the storage silo 40, the exhaust fan 80 is started. The exhaust fan 80 collects the dust from the dried caustic slag in the storage silo 40 to the second dust collector 70, preventing the dust from overflowing from the storage silo 40 and ensuring environmental safety.

[0051] In some embodiments, the desulfurization system further includes a third level gauge 90. The third level gauge 90 is located in the storage silo 40 and is used to detect the level of material in the storage silo 40, so as to prevent the drying causticized slag in the storage silo 40 from overflowing due to excessive amount, and to ensure the normal conveying of the drying causticized slag.

[0052] Combination Figure 1 In some embodiments, for conveying the dried causticized slag to the high-temperature furnace of the boiler 100, the third conveying assembly 50 includes: a receiving hopper 51, a material conveying pump 52, and a blower 53. The receiving hopper 51 is located below the storage silo 40 and is in sealed communication with the storage silo 40. The material conveying pump 52 is located below the receiving hopper 51, and the inlet of the material conveying pump 52 is in communication with the receiving hopper. The blower 53 is in communication with the air inlet of the material conveying pump 52. The inlet of the material conveying pump 52 is located between the air inlet and the outlet of the material conveying pump 52. For example, the blower may be a Roots blower.

[0053] The dried caustic slag in the buffer silo 40 enters the receiving hopper 51 and then enters the material sealing pump 52 through the inlet of the receiving hopper 51 and the material sealing pump 52. The blower 53 is started, and the blower 53 sends compressed air into the material sealing pump 52 through the air inlet of the material sealing pump 52. After the compressed air and the dried caustic slag are mixed in the material sealing pump 52, they are sent into the high-temperature furnace of the boiler 100 for flue gas desulfurization.

[0054] To fully illustrate this application, two embodiments are described below: Example 1 The raw material caustic slag is fed into the feeding hopper 11. The material in the feeding hopper 11 is fed into the first bucket elevator 13 via the first quantitative feeder 12, and then into the buffer silo 14 via the first bucket elevator 13. The material in the buffer silo 14 is fed into the dryer 21 via the second quantitative feeder 15. The dryer 21 dries the raw material caustic slag to obtain dried caustic slag, which is then fed into the storage silo 40 via the second bucket elevator 31. The dried caustic slag in the storage silo 40 is mixed with compressed air from the blower 53 in the material sealing pump 52, and then sent into the high-temperature furnace of the boiler 100 for flue gas desulfurization. The drying temperature of the dryer 21 is 125℃, and the moisture content of the raw material caustic slag after drying is 1.85%.

[0055] Example 2 The raw material caustic slag is fed into the feeding hopper 11. The material in the feeding hopper 11 is fed into the first bucket elevator 13 via the first quantitative feeder 12, and then into the buffer silo 14 via the first bucket elevator 13. The material in the buffer silo 14 is fed into the dryer 21 via the second quantitative feeder 15. The dryer 21 dries the raw material caustic slag to obtain dried caustic slag, which is then fed into the storage silo 40 via the second bucket elevator 31. The dried caustic slag in the storage silo 40 is mixed with compressed air from the blower 53 in the material sealing pump 52, and then sent into the high-temperature furnace of the boiler 100 for flue gas desulfurization. The drying temperature of the dryer 21 is 150℃, and the moisture content of the raw material caustic slag after drying is 1.05%.

[0056] In the description of this application, 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", etc., 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 application and simplifying the description, and do not 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 application.

[0057] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. 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. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0059] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0060] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A desulfurization system, characterized in that, include: First conveying component; The drying assembly includes a dryer, a blower, a hot air furnace, and a first dust collector. The feed inlet of the dryer is connected to the first conveying assembly, the blower is connected to the hot air furnace, the hot air furnace is connected to the air inlet of the dryer, and the first dust collector is connected to the air outlet of the dryer. The second conveying component is connected to the discharge port of the dryer; The storage compartment is connected to the second conveying component; The third conveying component is connected to the storage compartment.

2. The desulfurization system according to claim 1, characterized in that, The first conveying component includes: Feed hopper; The first quantitative feeder is located below the hopper; The feed inlet of the first bucket elevator is located below the discharge outlet of the first quantitative feeder and is connected to the discharge outlet of the first quantitative feeder. A buffer bin is located below the discharge port of the first bucket elevator and is connected to the discharge port of the first bucket elevator. The second quantitative feeder is located below the buffer silo and is connected to the feed inlet of the dryer.

3. The desulfurization system according to claim 2, characterized in that, The first conveying component further includes: A first level gauge is installed in the feeding hopper; The second level gauge is located in the buffer silo.

4. The desulfurization system according to any one of claims 1-3, characterized in that, The drying assembly also includes: An induced draft fan is connected to the first dust collector.

5. The desulfurization system according to any one of claims 1-3, characterized in that, The second conveying assembly includes: The feed inlet of the second bucket elevator is connected to the discharge outlet of the dryer, and the discharge outlet of the second bucket elevator is connected to the storage bin.

6. The desulfurization system according to any one of claims 1-3, characterized in that, The first dust collector has an openable and closable opening, and when the opening is open, the first dust collector is in communication with the storage bin.

7. The desulfurization system according to claim 6, characterized in that, The desulfurization system also includes: A screw conveyor is located at the first dust collector and is connected to the opening and the storage bin.

8. The desulfurization system according to any one of claims 1-3, characterized in that, The desulfurization system also includes: A second dust collector is located at the top of the storage bin; The exhaust fan is connected to the second dust collector.

9. The desulfurization system according to any one of claims 1-3, characterized in that, The desulfurization system also includes: The third level gauge is located in the storage bin.

10. The desulfurization system according to any one of claims 1-3, characterized in that, The third conveying component includes: A receiving hopper is located below the storage compartment and is sealed and connected to the storage compartment. A material sealing pump is located below the receiving hopper, and the inlet of the material sealing pump is connected to the receiving hopper; A blower is connected to the air inlet of the material sealing pump; The feed inlet of the material sealing pump is located between the air inlet and the discharge outlet of the material sealing pump.

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