A screw feed diluter and solid material conveying system and method employing the same

Abstract

The application discloses a screw feeding diluter, a solid material conveying system and method adopting the same, and belongs to the technical field of solid material conveying. The solid material conveying system comprises the screw feeding diluter, a solid-liquid mixed material conveying pump, a discharging kettle, a forward-reverse compressor, a gas phase buffer tank, a liquefied compressor, a liquid carbon dioxide storage tank and a liquid carbon dioxide conveying pump. The application utilizes liquid carbon dioxide to dilute and slurry the solid material, and realizes solid-liquid separation through pressure reduction and gasification. The solid material feeding end and the solid material discharging end are connected together through airtight metal pipelines, so that the completely airtight conveying of toxic wet material with irritating odor and toxic odor is effectively realized, and the problems of gas overflow, solid material scattering, poor operation environment and environmental pollution caused by traditional manual carrying and belt conveying are effectively solved. The solid material conveying method has the advantages of completely airtight conveying, continuous operation, high automation degree and environmental protection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solid material conveying, in particular to a screw feeding diluter, and a solid material conveying system and method using the same. BACKGROUND

[0002] In the fields of chemical industry, medicine, etc., the production of some toxic solid materials is often involved, including sodium cyanide, potassium cyanide, arsenic trioxide, mercury chloride, etc. These materials are all toxic chemicals, but they are indispensable industrial raw materials in people's life. In the production process of these solid materials, a solid-liquid separation unit is often involved. The wet material after solid-liquid separation through a filter press or a centrifuge often needs to be further processed by drying, which faces the problem of conveying of toxic wet solid materials. In addition to being toxic chemicals, such wet materials often contain a certain amount of chemical solvents, which are irritating and toxic. Because of the particularity of the materials, many difficulties and pain points are faced in the process of conveying the solid materials.

[0003] For the transportation of toxic wet solid materials, there are currently three methods in industry, one is manual transportation, the second is belt transportation, and the third is pneumatic conveying. Pneumatic conveying is often used for the transportation of dry solid powders and has high requirements for water content. Wet solid materials cannot be conveyed by pneumatic conveying because of the blockage of equipment and pipelines. Belt transportation has great advantages in long-distance horizontal transportation, but it is often limited by its complex equipment system, large floor area, high investment cost, and is often limited in short-distance transportation and vertical transportation. Therefore, the manual transportation method is often used in industry at present.

[0004] The main problems faced by manual transportation method are: (1) because the solid material itself is a toxic chemical, in addition, the solid material also contains irritating and toxic gas, the operator needs to wear a gas mask to operate, the operator's work experience is poor, and even if the gas mask is worn, the body and mind will still be greatly harmed; (2) because the solid material contains irritating and toxic gas, open transportation will cause environmental pollution of the gas; (3) during the transportation of the solid material by the manual forklift, the material will inevitably scatter on the road, which will cause ground and groundwater pollution in rainy days; (4) because a large number of personnel need to work in harsh environments, the labor cost is high; (5) as the environmental requirements and occupational health requirements become more and more strict, the traditional transportation method faces the risk of being stopped at any time. Based on this situation, how to effectively convey the toxic wet material containing irritating and toxic odor has become a problem to be solved. SUMMARY

[0005] The present application aims to provide a screw feeding diluter and a solid material conveying system and method using the same, which can effectively solve the problem of difficult conveying of toxic wet material with irritating odor in the field of chemical industry and medicine.

[0006] To achieve the above-mentioned purpose, the present application provides a screw feeding diluter, which comprises a diluter shell, a screw feeding device, a material stirring device and an annular overflow baffle. The diluter shell is provided with a material outlet, a first gas phase balance port, a second gas phase balance port and a liquid carbon dioxide inlet. The screw feeding device comprises a screw feeding cylinder, a screw blade and a screw feeding motor. The screw feeding cylinder is arranged inside the diluter shell and its lower end extends to the outside of the diluter shell for serving as an inlet for solid material. The upper end of the screw feeding cylinder is provided with a plurality of solid material outlets on the periphery for the solid material to enter the inside of the diluter shell from the screw feeding cylinder. Each of the solid material outlets is provided with a feeding non-return device. The screw blade is arranged in the screw feeding cylinder for pushing the solid material to enter the diluter shell from bottom to top. The screw feeding motor is arranged on the top of the screw feeding cylinder for driving the screw blade to rotate. The material stirring device comprises a material stirring support and a material stirring motor. The material stirring support is arranged in the cavity of the diluter shell. The material stirring motor is arranged outside the diluter shell and connected with the material stirring support through a material stirring shaft. The annular overflow baffle is arranged at the bottom of the diluter shell and located on the periphery of the screw feeding cylinder. After the solid material and the liquid carbon dioxide enter the cavity of the diluter shell, they all enter the internal space area of the annular overflow baffle. The solid material is fully slurried under the stirring of the material stirring support. The slurried material overflows through the annular overflow baffle to the area formed by the annular overflow baffle and the inner side wall of the diluter shell, and then is conveyed to a discharge kettle through the material outlet.

[0007] Further, the feeding non-return device comprises a feeding pipe. One end of the feeding pipe is connected with the inner cavity of the screw feeding cylinder. The other end of the feeding pipe is provided with a sealing flange plate and a sealing flange cover. A circular flange plate hard sealing pad is arranged on the outer side of the sealing flange plate. A flange cover sealing pad is embedded on the surface of the flange plate hard sealing pad. The inner surface of the sealing flange cover is provided with the flange cover sealing pad corresponding to the flange plate hard sealing pad. A plurality of springs are arranged on the periphery of the outer side wall of the feeding pipe. One end of the spring is connected with a stress fixed plate. The stress fixed plate is arranged on the outer side wall of the end of the feeding pipe connected with the screw feeding cylinder. The other end of the spring is connected with the sealing flange cover.

[0008] Further, the bottom of the material stirring support is provided with a branch structure, wherein part of the branch structure is located in the internal space area of the annular overflow baffle, and the other part of the branch structure is located in the area surrounded by the annular overflow baffle and the inner side wall of the diluter shell; a plurality of stirring support lugs are arranged on the branch structure of the material stirring support.

[0009] The application further provides a solid material conveying system, which comprises the above-mentioned spiral feeding diluter, and further comprises a solid-liquid mixed material conveying pump, a discharge kettle, a forward-reverse compressor, a gas phase buffer tank, a liquefaction compressor, a liquid carbon dioxide storage tank and a liquid carbon dioxide conveying pump; the discharge kettle comprises a first discharge kettle and a second discharge kettle; a weighing module is arranged at the bottom of the supporting leg of the spiral feeding diluter; the first gas phase balance pipeline of the spiral feeding diluter is connected with the gas phase balance pipelines of the first discharge kettle and the second discharge kettle respectively; the material outlet of the spiral feeding diluter is connected with the inlet of the solid-liquid mixed material conveying pump through a discharge pipeline; the outlet of the solid-liquid mixed material conveying pump is connected with the slurry feeding pipelines of the first discharge kettle and the second discharge kettle through discharge pipelines respectively; the gas phase discharge pipelines of the first discharge kettle and the second discharge kettle are connected with the gas phase feeding pipeline of the gas phase buffer tank; the forward-reverse compressor and a compressor control system are arranged between the discharge pipelines of the first discharge kettle and the second discharge kettle; the outlet pipeline of the gas phase buffer tank is connected with the inlet of the liquefaction compressor; the outlet pipeline of the liquefaction compressor extends to below the liquid level of the liquid carbon dioxide storage tank; the gas phase carbon dioxide pipeline of the liquid carbon dioxide storage tank is connected with the second gas phase balance pipeline of the spiral feeding diluter; the liquid outlet of the liquid carbon dioxide storage tank is connected with the inlet of the liquid carbon dioxide conveying pump through a first liquid carbon dioxide discharge pipeline; the outlet of the liquid carbon dioxide conveying pump is connected with the liquid carbon dioxide inlet of the spiral feeding diluter through a second liquid carbon dioxide discharge pipeline; a conical material collecting groove is arranged below the spiral feeding diluter, the first discharge kettle and the second discharge kettle.

[0010] Further, the second liquid carbon dioxide outlet pipeline is provided with an inlet flow meter and a switch valve V01, the spiral feed diluter is provided with a first liquid level meter and a first pressure gauge, the second gas phase balance pipeline of the spiral feed diluter is provided with a switch valve V03, the liquid carbon dioxide storage tank is provided with a fifth pressure gauge, the first liquid level meter is interlocked with the feed flow meter, the switch valve V01, the weighing module, and the rotating speed signal of the spiral feed motor, the first pressure gauge and the fifth pressure gauge are both interlocked with the switch valve V03; the first outlet kettle is provided with a second liquid level meter and a second pressure gauge, the second liquid level meter is interlocked with the switch valve V10 on the slurry feed pipeline of the first outlet kettle, the outlet pipeline of the first outlet kettle is provided with a switch valve V11; the second outlet kettle is provided with a third liquid level meter and a third pressure gauge, the third liquid level meter is interlocked with the switch valve V19 on the slurry feed pipeline of the second outlet kettle, the outlet pipeline of the second outlet kettle is provided with a switch valve V18; the compressor control system comprises a gas phase balance pipeline A, a gas phase balance pipeline B, and a gas phase balance pipeline C, two ends of the gas phase balance pipeline A are respectively connected with the gas phase material outlet of the first outlet kettle and one end of the forward-reverse compressor, the gas phase balance pipeline A is provided with a switch valve V12 and a switch valve V15; two ends of the gas phase balance pipeline B are respectively connected with the gas phase material outlet of the second outlet kettle and the other end of the forward-reverse compressor, the gas phase balance pipeline B is provided with a switch valve V17 and a switch valve V16; two ends of the gas phase balance pipeline C are respectively connected with the gas phase balance pipeline A and the gas phase balance pipeline B, the gas phase balance pipeline C is provided with a switch valve V14; the rotating speed signal of the forward-reverse compressor is interlocked with the switch valves V11, V12, V14, V17, V18, the second pressure gauge, and the third pressure gauge; the gas phase buffer tank is provided with a fourth pressure gauge, the fourth pressure gauge is interlocked with the start-stop signal switch of the liquefied compressor and the switch valve V26 on the outlet pipeline of the liquefied compressor; the liquid carbon dioxide storage tank is provided with a thermometer and a fourth liquid level meter, the thermometer is interlocked with the switch valve V33 on the cooling circulating water upper pipeline, and the fourth liquid level meter is interlocked with the switch valve V31 on the liquid carbon dioxide feeding pipeline.

[0011] Further, a purge pipeline is arranged between the gas phase carbon dioxide pipeline of the liquid carbon dioxide storage tank and the outlet pipeline of the spiral feed diluter, the purge pipeline is provided with a purge flow meter and an adjusting valve V07, and the purge flow meter is interlocked with the adjusting valve V07; the outlet of the liquid carbon dioxide conveying pump is connected with a backflow pipeline, and the backflow pipeline extends into the liquid carbon dioxide storage tank below the liquid level.

[0012] Further, a flow-restricting orifice is arranged on the first gas phase balance pipeline, the gas phase balance pipeline C, the gas phase feeding pipeline of the gas phase buffer tank and the second gas phase balance pipeline of the spiral feeding diluter, the main function of the flow-restricting orifice is to limit the flow rate of the material in the pipeline, avoid too fast flow rate, material impact, pipeline wear and noise; in order to avoid error in the weighing process, a metal hose is arranged on the pipeline connected with the spiral feeding diluter.

[0013] Further, the lower part of the discharging kettle is a conical structure, and a gradually changing spiral blade capable of rotating forward and reversely is arranged in the discharging kettle; an outlet filter is arranged in the discharging kettle and at the gas phase material outlet of the discharging kettle.

[0014] The application further provides a solid material conveying method, which uses the above solid material conveying system to convey solid material, and the conveying method is as follows:

[0015] The spiral feeding motor is started, the spiral feeding motor drives the spiral blade to rotate, the solid material is conveyed from the conical material collecting groove at the material position one into the spiral feeding diluter cavity; the liquid carbon dioxide conveying pump is started, the liquid carbon dioxide in the liquid carbon dioxide storage tank is conveyed into the spiral feeding diluter cavity through the second liquid carbon dioxide discharging pipeline; in order to ensure the stability of the material conveying of the liquid carbon dioxide conveying pump, the switch valve V03 is opened before the pump is started, and the switch valve V03 is closed when the readings of the first pressure gauge and the fifth pressure gauge are consistent; the material stirring motor is started at the same time when the spiral feeding motor and the liquid carbon dioxide conveying pump are started, so that the solid-liquid mixture is fully stirred and slurried;

[0016] When the spiral feeding diluter completes the slurry of the solid material, the solid-liquid mixture conveying pump is started, the switch valve V05 and the switch valve V10 are opened at the same time, the slurry in the spiral feeding diluter is conveyed into the first discharging kettle through the pipeline by the solid-liquid mixture conveying pump; in order to ensure the stability of the material conveying of the solid-liquid mixture conveying pump, the switch valve V09 is opened before the solid-liquid mixture conveying pump is started, the switch valve V09 is closed when the readings of the first pressure gauge and the second pressure gauge on the first discharging kettle are consistent, the solid-liquid mixture conveying pump is started to convey the slurry, when the second liquid level meter indicates that the liquid level reaches a certain value, the switch valve V10 is closed in linkage, and the conveying of the slurry is completed;

[0017] The liquid carbon dioxide is separated from the solid-liquid mixture in the first discharge kettle by decompression gasification, specifically, the discharge kettle stirring motor on the first discharge kettle is started to make the materials in the discharge kettle loose from bottom to top, and the switch valve V11 is opened, at this time, the gasified carbon dioxide in the first discharge kettle will flow into the gas phase buffer tank; at this time, the fourth pressure gauge on the gas phase buffer tank will rise to exceed the set value, the fourth pressure gauge will start the liquefied compressor and open the switch valve V26, under the suction compression of the liquefied compressor, the gas phase carbon dioxide in the gas phase buffer tank will be gradually compressed into the liquid carbon dioxide storage tank; when the liquid carbon dioxide in the first discharge kettle is all gasified under the dispersion of the gradually changing spiral blade, the second pressure gauge will close the switch valve V11, and when the fourth pressure gauge on the gas phase buffer tank at the back end indicates a value lower than the set value, the liquefied compressor and the switch valve V26 will be stopped.

[0018] To avoid the high-pressure gas carbon dioxide in the first discharge kettle being discharged to the outside when the solid material is discharged from the bottom, causing carbon dioxide loss, the pressure in the first discharge kettle needs to be further reduced to 0.1 MPa, which is realized by the following process: at this time, the second discharge kettle is in an idle state, the switch valves V12, V14 and V17 are opened, the gas phase carbon dioxide in the first discharge kettle will flow into the second discharge kettle, when the pressure values of the first discharge kettle and the second discharge kettle are consistent, the pressures in the first discharge kettle and the second discharge kettle are both changed to 1.25 MPa, at this time, the switch valve V14 is closed, the switch valve V15 is opened, and the forward-reverse compressor is started to suck the gas phase carbon dioxide in the first discharge kettle into the second discharge kettle, when the pressure value of the second pressure gauge is reduced to 0.1 MPa, the switch valves V12, V15 and V17 are closed, at this time, the switch valve V13 at the bottom of the first discharge kettle is opened, and the discharge kettle stirring motor is started in reverse, under the rotation of the gradually changing spiral blade, the solid material is discharged into the conical material collection tank at the material position two.

[0019] After the solid material is transported from the material position one to the material position two, the carbon dioxide is recycled and utilized: the liquefied compressor compresses the gas phase carbon dioxide in the gas phase buffer tank and enters the liquid carbon dioxide storage tank, when the temperature gauge reading on the liquid carbon dioxide storage tank is greater than a specified value, the switch valve V33 is opened to cool down, when the temperature gauge reading is less than a specified value, the switch valve V33 is closed to keep the temperature in the liquid carbon dioxide storage tank constant within a certain range, when the fourth liquid level gauge indicates a value lower than a certain value, the switch valve V31 is opened, and when the fourth liquid level gauge indicates a certain liquid level, the switch valve V31 is closed to ensure the stability of the amount of liquid carbon dioxide in the system.

[0020] Further, the solid material feed quantity entering the spiral feed diluter cavity is measured by a weighing module, the liquid carbon dioxide feed quantity is measured by a feed flow meter, and is proportional to the measurement value of the weighing module; in order to avoid the residual material in the solid-liquid mixed material conveying pipeline from blocking the pipeline, after the material conveying is completed, the pipeline is purged to purge the material.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] (1) The spiral feed diluter of the present application is provided with a spiral feed cylinder in the spiral feed diluter cavity, one end of which extends out of the equipment and is provided as a solid material inlet, and the other end extends into the equipment cavity and is provided with a feed check device around the end, as a solid material inlet into the spiral feed diluter equipment cavity, the solid material is pushed into the spiral feed diluter equipment cavity from bottom to top by the rotation of the spiral blade; an annular overflow baffle is provided in the spiral feed diluter cavity, and after the solid material is fully slurried by the material stirring support, it is conveyed to the discharge kettle equipment through the material outlet; the structure is reasonable, and provides a basis for realizing the conveying of toxic wet material by using liquid carbon dioxide.

[0023] (2) The solid material conveying system of the present application comprises a spiral feed diluter, a solid-liquid mixed material conveying pump, a discharge kettle, a forward-reverse compressor, a gas phase buffer tank, a liquefied compressor, a liquid carbon dioxide storage tank, a liquid carbon dioxide conveying pump and other equipment; the system can use liquid carbon dioxide as a solvent for diluting and slurrying solid materials, and after dilution and slurry, the liquid carbon dioxide will quickly gasify into gaseous carbon dioxide under reduced pressure, so as to realize the complete separation of liquid carbon dioxide and solid materials, and realize the transfer and conveying of materials without introducing new impurities into the solid materials; effectively solve the problem of difficult conveying of toxic wet materials with irritating odor and toxic odor in the chemical and pharmaceutical fields.

[0024] (3) The solid material conveying method of the present application uses liquid carbon dioxide to dilute and slurry the solid material, and realizes long-distance conveying, and realizes solid-liquid separation by pressure reduction and gasification. The solid material feeding end and the solid material discharging end are connected together through airtight metal pipeline, which effectively realizes the completely airtight conveying of toxic wet materials with irritating odor and toxic odor. The problems of gas overflow, solid material scattering, poor operation environment and environmental pollution caused by traditional manual carrying and belt conveying are solved. The solid material conveying method has the advantages of completely airtight conveying, continuous operation, high automation degree, environmental protection and the like.

[0025] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described in detail below with reference to the drawings. Attached Figure Description

[0026] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0027] Figure 1 A structural diagram of a solid material conveying system provided in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of a spiral feed diluter provided in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the discharge vessel provided in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the feed anti-reverse device provided in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the structure of the sealing flange provided in an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the structure of the outlet filter provided in an embodiment of the present invention. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent transformations or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0034] Example 1

[0035] Please see Figure 1 This embodiment provides a screw feed diluter, which V001 includes a diluter housing V001-04, a screw feed device, a material mixing device, and an annular overflow baffle V001-14; the specific structure is as follows:

[0036] The diluter shell V001-04 is a cylindrical structure, and the diluter shell is provided with a material outlet V001-03, a first gas phase balance port V001-07, a second gas phase balance port V001-10, and a liquid carbon dioxide inlet V001-16. The spiral feeding device includes a spiral feeding cylinder V001-17, a spiral blade V001-01, and a spiral feeding motor V001-06. The spiral feeding cylinder V001-17 is arranged at the axial center line position in the cavity of the diluter shell, and the lower end of the spiral feeding cylinder extends to the outside of the diluter shell and is mainly used as the inlet for solid materials. The upper end of the spiral feeding cylinder is provided with at least two solid material outlets on the side for the solid materials to enter the inner cavity of the diluter shell from the spiral feeding cylinder, and each solid material outlet is provided with a feeding check device V001-12. The spiral blade is arranged in the spiral feeding cylinder and is used to push the solid materials into the diluter shell from bottom to top. The spiral feeding motor is arranged at the top outside the spiral feeding cylinder and is connected with the spiral blade to rotate the spiral blade. The material stirring device includes a material stirring support V001-13 and a material stirring motor V001-08. The material stirring support is arranged in the cavity of the diluter shell, and the material stirring motor is arranged outside the diluter shell and is connected with the material stirring support through a material stirring shaft V001-09. An annular overflow baffle V001-14 is arranged at the bottom of the diluter shell and is located at the side of the spiral feeding cylinder. During transportation, after the solid materials to be transported and the liquid carbon dioxide enter the cavity of the diluter shell, they first enter the internal space region of the annular overflow baffle. The solid materials and the liquid carbon dioxide are fully slurried under the stirring of the material stirring support, and the slurried materials overflow through the top of the annular overflow baffle to the region outside the annular overflow baffle, i.e., the region surrounded by the annular overflow baffle and the inner side wall of the diluter shell, and are then transported to the discharge kettle of the subsequent process through the material outlet V001-03. In the structure, the main purpose of arranging the annular overflow baffle in the cavity of the spiral feeding diluter is to prevent the solid materials that have just entered the cavity of the spiral feeding diluter from being blocked before being fully slurried. The bottom of the material stirring support V001-13 is arranged in a branched structure, one part of which is arranged in the internal space region of the annular overflow baffle, and the other part is arranged in the region surrounded by the annular overflow baffle and the inner side wall of the diluter shell. A plurality of stirring support lugs V001-15 are arranged on the branched structure of the material stirring support. The material stirring support can be used to stir the materials on both sides of the annular overflow baffle. The bottom of the spiral feeding diluter is provided with a supporting leg V001-02 for supporting the spiral feeding diluter V001 above the conical material collecting groove, so as to facilitate the feeding of the solid materials through the spiral feeding cylinder V001-17.The solid material feed amount is measured by weighing, and a weighing module is arranged at the bottom of the support leg to measure the overall weight of the screw feed diluter V001 and the material inside. In order to facilitate equipment maintenance and maintenance, a diluter manhole V001-05 is also provided on the diluter shell V001-04.

[0037] Please refer to Figure 2 、 Figure 4 and Figure 5 , the feed stop device includes a feed pipe V001-12-02, one end of the feed pipe is connected with the screw feed cylinder, and the other end of the feed pipe is provided with a sealing flange cover V001-12-06 and a sealing flange plate V001-12-08. A circular flange plate hard sealing pad V001-12-10 is arranged on the outer side of the sealing flange plate, and a flange plate soft sealing pad V001-12-09 is embedded on the surface of the flange plate hard sealing pad. The combination of hard sealing and soft sealing can better achieve the sealing effect. The inner surface of the sealing flange cover is provided with a flange cover sealing pad V001-12-07 corresponding to the flange plate soft sealing pad, and the sealing is realized by the fit of the flange cover sealing pad and the flange plate soft sealing pad. The outer side wall of the feed pipe is provided with at least three springs V001-12-04, which are used to ensure that the feed stop device is in a closed state without external force. One end of the spring is connected with a stress fixed plate V001-12-03, and the stress fixed plate is arranged on the outer side wall of the end of the feed pipe connected with the screw feed cylinder. The other end of the spring is connected with the flange cover fixed pull rod V001-12-05 through the pull rod connecting ring V001-12-11. The corresponding position of the sealing flange plate is provided with a pull rod hole V001-12-08-01 for the flange cover fixed pull rod to pass through, and the pull rod hole is mainly used to stabilize the spring system. The other end of the spring is connected with the sealing flange cover, and under the traction of the spring contraction force, the sealing flange cover and the sealing flange plate are tightly fitted to form a seal. When the screw feed diluter needs to feed solid materials, the screw blade rotates in the screw feed cylinder to push the solid materials upward, and the pressure generated between the solid materials pushes the sealing flange cover outward to realize the feeding of the solid materials into the screw feed diluter cavity through the feed stop device. When the screw blade stops rotating, the pressure generated between the solid materials decreases or disappears, and at this time, the sealing flange cover is tightly fitted with the sealing flange plate under the traction of the spring contraction force, so as to avoid the backflow of the materials in the screw feed diluter cavity through the feed stop device and realize the function of stopping.

[0038] Example 2

[0039] Please refer to Figures 1 to 6The embodiment of the present application also provides a solid material conveying system, which comprises a screw feeding diluter V001, a solid-liquid mixed material conveying pump P001, a discharge kettle, a forward-reverse compressor C001, a gas phase buffer tank V003, a liquefaction compressor C002, a liquid carbon dioxide storage tank V004 and a liquid carbon dioxide conveying pump P002, and two discharge kettles are arranged in the solid material conveying system, which are a first discharge kettle V002A and a second discharge kettle V002B; and the specific structure is as follows:

[0040] The first gas phase balance port V001-07 and the second gas phase balance port V001-10 of the spiral feeding diluter are respectively connected with the first gas phase balance pipeline GD-006 and the second gas phase balance pipeline GD-003, the first gas phase balance pipeline GD-006 of the spiral feeding diluter is respectively connected with the gas phase balance pipeline GD-008 of the first discharge kettle and the gas phase balance pipeline GD-016 of the second discharge kettle; the material outlet V001-03 of the spiral feeding diluter is connected with the inlet of the solid-liquid mixed material conveying pump P001 through the discharge pipeline GD-005, the outlet of the solid-liquid mixed material conveying pump P001 is respectively connected with the slurry feeding pipeline GD-009 of the first discharge kettle and the slurry feeding pipeline GD-015 of the second discharge kettle through the discharge pipeline GD-007; the gas phase discharge pipeline GD-010 of the first discharge kettle and the gas phase discharge pipeline GD-014 of the second discharge kettle are both connected with the gas phase feeding pipeline GD-017 of the gas phase buffer tank, and the gas phase discharge pipeline GD-011 of the first discharge kettle and the gas phase discharge pipeline GD-013 of the second discharge kettle are provided with the forward-reverse compressor C001 and the compressor control system; the outlet pipeline GD-018 of the gas phase buffer tank V003 is connected with the inlet of the liquefaction compressor C002, the outlet pipeline GD-019 of the liquefaction compressor is communicated with the inner cavity of the liquid carbon dioxide storage tank V004, the gas phase carbon dioxide pipeline GD-002 of the liquid carbon dioxide storage tank is connected with the second gas phase balance pipeline GD-003 of the spiral feeding diluter, the liquid outlet of the liquid carbon dioxide storage tank is connected with the inlet of the liquid carbon dioxide conveying pump P002 through the first liquid carbon dioxide discharge pipeline GD-023, and the outlet of the liquid carbon dioxide conveying pump is connected with the liquid carbon dioxide inlet V001-16 of the spiral feeding diluter through the second liquid carbon dioxide discharge pipeline GD-001. The conical material collecting groove is arranged below the spiral feeding diluter V001, the first discharge kettle V002A and the second discharge kettle V002B. In the structure, in order to increase the disturbance of the liquid in the liquid carbon dioxide storage tank V004 and enhance the heat exchange effect, the outlet pipeline GD-019 of the liquefaction compressor extends below the liquid level of the liquid carbon dioxide storage tank V004. In addition, the outlet end of the liquid carbon dioxide conveying pump P002 is additionally provided with the backflow pipeline GD-024, which also extends below the liquid level of the liquid carbon dioxide storage tank V004, so as to increase the disturbance of the liquid in the liquid carbon dioxide storage tank V004 and enhance the heat exchange effect.

[0041] For reference Figure 3 and Figure 6, the first discharge kettle and the second discharge kettle each comprise a discharge kettle shell V002-03, the lower part of the discharge kettle shell is a conical cylinder structure, the bottom of the conical cylinder is a solid material outlet V002-01; the top of the discharge kettle shell is provided with a third gas phase balance port V002-05, a solid-liquid material inlet V002-06 and a gas phase material outlet V002-09. Specifically, the solid-liquid material inlets V002-06 of the first discharge kettle V002A and the second discharge kettle V002B are connected with the slurry feeding pipeline GD-009 and the slurry feeding pipeline GD-015 respectively, the third gas phase balance ports V002-05 of the first discharge kettle and the second discharge kettle are connected with the gas phase balance pipeline GD-008 and the gas phase balance pipeline GD-016 respectively, the gas phase material outlets V002-09 of the first discharge kettle and the second discharge kettle are connected with the gas phase discharge pipeline GD-010 and the gas phase discharge pipeline GD-014 respectively; the solid material outlets V002-01 of the first discharge kettle and the second discharge kettle are respectively provided with kettle bottom on-off valves V13 and V21. The inside of each discharge kettle is provided with a gradually changing spiral blade V002-02 which is attached to the conical cylinder, which facilitates better discharge of solid materials. The top of the discharge kettle is provided with a discharge kettle stirring motor V002-07, which is used to drive the gradually changing spiral blade to rotate forward or reverse, the forward rotation is used to push the solid material out of the equipment cavity, and the reverse rotation is used to loosen the slurry in the equipment upward, which facilitates the complete change of liquid carbon dioxide into gas, and avoids the solid material discharged from the equipment cavity still containing a small amount of carbon dioxide.

[0042] In a specific embodiment, the second liquid carbon dioxide discharge pipeline GD-001 is provided with a feed flow meter FIAS-001 and a switch valve V01, the screw feed diluter is provided with a first liquid level meter LIAS-001 and a first pressure gauge PIAS-001, the second gas phase balance pipeline GD-003 of the screw feed diluter is provided with a switch valve V03, the liquid carbon dioxide storage tank V004 is provided with a fifth pressure gauge PIAS-004, the first liquid level meter LIAS-001 is interlocked with the feed flow meter FIAS-001, the switch valve V01, and the speed signal YIS-001 of the screw feed motor V001-06, and the first pressure gauge PIAS-001 and the fifth pressure gauge PIAS-004 are both interlocked with the switch valve V03; the first discharge kettle V002A is provided with a second liquid level meter LIAS-002A and a second pressure gauge PIAS-002A, the second liquid level meter is interlocked with the switch valve V10 on the slurry feed pipeline GD-009 of the first discharge kettle, and the gas phase discharge pipeline GD-010 of the first discharge kettle is provided with a switch valve V11; the second discharge kettle V002B is provided with a third liquid level meter LIAS-002B and a third pressure gauge PIAS-002B, the third liquid level meter is interlocked with the switch valve V19 on the slurry feed pipeline GD-015 of the second discharge kettle, and the gas phase discharge pipeline GD-014 of the second discharge kettle is provided with a switch valve V18. The compressor control system includes a gas phase balance pipeline A GD-011, a gas phase balance pipeline B GD-013, and a gas phase balance pipeline C GD-012, both ends of the gas phase balance pipeline A are connected with the gas phase material outlet V002-09 of the first discharge kettle and one end of the forward and reverse rotation compressor C001 respectively, and the gas phase balance pipeline A is provided with a switch valve V12 and a switch valve V15; both ends of the gas phase balance pipeline B are connected with the gas phase material outlet V002-09 of the second discharge kettle and the other end of the forward and reverse rotation compressor C001 respectively, and the gas phase balance pipeline B is provided with a switch valve V17 and a switch valve V16; both ends of the gas phase balance pipeline C are connected with the gas phase balance pipeline A and the gas phase balance pipeline B respectively, and the gas phase balance pipeline C is provided with a switch valve V14; the speed signal YIS-005 of the forward and reverse rotation compressor is interlocked with the switch valve V11, the switch valve V12, the switch valve V14, the switch valve V17, the switch valve V18, the second pressure gauge PIAS-002A, and the third pressure gauge PIAS-002B; the gas phase buffer tank V003 is provided with a fourth pressure gauge PIAS-003, the fourth pressure gauge is interlocked with the start-stop signal switch YIS-004 of the liquefied compressor C002 and the switch valve V26 on the outlet pipeline of the liquefied compressor.

[0043] In a specific embodiment, in order to avoid the solid material deposited in the pipe after the pipe conveying the slurry material, causing the pipe to be blocked, a purge pipe GD-004 is arranged between the gas phase carbon dioxide pipe GD-002 of the liquid carbon dioxide storage tank and the discharge pipe GD-005 of the screw feed diluter, a purge flow meter FIAS-002 and a regulating valve V07 are arranged on the purge pipe GD-004, and the purge flow meter and the regulating valve V07 are arranged in interlocking manner. When the discharge pipe GD-005 and GD-007, the slurry feed pipe GD-009 and GD-015 conveying the slurry material are completed, the regulating valve V07 on the purge pipe GD-004 is opened, the material conveying pipe system is purged, and the residual slurry in the pipe is purged into the discharge tank, so as to avoid the deposition and blockage in the pipe system.

[0044] In a specific embodiment, in order to avoid the material flow rate in the first gas phase balance pipe GD-006 being too fast, a flow orifice plate RO-01 is arranged on the first gas phase balance pipe. In order to avoid the gas flow rate in the gas phase balance pipe C GD-012 being too fast, a flow orifice plate RO-02 is arranged on the gas phase balance pipe C GD-012. In order to avoid the gas flow rate in the gas phase feed pipe being too fast, a flow orifice plate RO-03 is arranged on the gas phase feed pipe GD-017 of the gas phase buffer tank. Because the pressure difference between the liquid carbon dioxide storage tank V004 and the screw feed diluter V001 is large, in order to avoid the material flow rate in the gas phase carbon dioxide pipe GD-002 and the second gas phase balance pipe GD-003 being too fast, a flow orifice plate RO-04 is arranged on the second gas phase balance pipe GD-003.

[0045] In a specific embodiment, in order to avoid the pipe directly connected to the screw feed diluter V001 affecting the weighing of the overall weight, a metal hose RG-01 is arranged on the first gas phase balance pipe GD-006 connected thereto, a metal hose RG-02 is arranged on the second gas phase balance pipe GD-003, a metal hose RG-03 is arranged on the discharge pipe GD-005, and a metal hose RG-04 is arranged on the second liquid carbon dioxide discharge pipe GD-001. The amount of solid material entering the cavity of the screw feed diluter is obtained by the change difference of the weighing module metering value.

[0046] Referring to Figure 6As shown, the outlet filter V002-10 is arranged in the discharge kettle and at the gas phase material outlet V002-09 of the discharge kettle to avoid that a small amount of solid particles is entrained in the process of the gas phase carbon dioxide flowing out. Preferably, the outlet filter is an integral inner part, the outer surface of which is provided with filter cloth, and the outlet filter is connected with the inner pipe of the gas phase material outlet through the thread V002-10-01, when the outlet filter needs to be replaced after being used for a period of time, the operator rotates and removes it through the manhole V002-04 of the discharge kettle, so that the outlet filter can be quickly and conveniently replaced.

[0047] Embodiment 3

[0048] The embodiment of the present application also provides a solid material conveying method for realizing completely sealed conveying of toxic wet material containing irritating odor and toxic odor. The solid material conveying method effectively solves the problems of bad operation environment and environmental pollution caused by gas overflow and solid material scattering in the process of traditional manual conveying and belt conveying. Figure 1 In order to realize completely sealed conveying of toxic wet material containing irritating odor and toxic odor from a material position to a material position two, the solid material conveying method of the present application is realized by using the following method.

[0049] At the material position one, a conical material collecting groove is arranged on the ground, and the solid material generated from the upstream section is discharged into the conical material collecting groove. A screw feeding and dilution device V001 for feeding and diluting the solid material is arranged above the conical material collecting groove. The bottom end of the screw feeding cylinder V001-17 arranged at the bottom of the screw feeding and dilution device V001 can be in contact with the solid material. A first discharge kettle V002A and a second discharge kettle V002B are arranged at the material position two, which are used for the discharge of the solid material and the reduced pressure gasification. The screw feeding and dilution device V001 and the first discharge kettle V002A and the second discharge kettle V002B are connected by a metal pipeline for material conveying. When it is needed to convey the solid material from the material position one to the material position two, the screw feeding motor V001-06 is started to drive the screw blade V001-01 to rotate through the screw feeding rotating shaft V001-11. The rotation of the screw blade V001-01 drives the solid material to move from bottom to top. The solid material passes through the feeding check device, and enters the cavity of the screw feeding and dilution device from the conical material collecting groove at the material position one. The feeding amount of the solid material is measured by the weighing module arranged at the bottom of the equipment leg of the screw feeding and dilution device. The liquid carbon dioxide conveying pump P002 is started to convey the liquid carbon dioxide in the liquid carbon dioxide storage tank V004 into the cavity of the screw feeding and dilution device V001 through the second liquid carbon dioxide discharge pipeline GD-001. The feeding amount of the liquid carbon dioxide is measured by the feeding flow meter FIAS-001, and is proportional to the measured value of the weighing module. In order to stabilize the feeding of the liquid carbon dioxide conveying pump P002, before starting the liquid carbon dioxide conveying pump P002, the switch valve V03 on the pipeline GD-003 is opened. At this time, the gaseous carbon dioxide in the liquid carbon dioxide storage tank V004 enters the screw feeding and dilution device V001 through the pipeline GD-002 and the pipeline GD-003. When the pressure value of the pressure gauge PIAS-001 on the screw feeding and dilution device V001 is consistent with the pressure value of the pressure gauge PIAS-004 on the liquid carbon dioxide storage tank V004, it is indicated that the gaseous phase balance is achieved. At this time, the switch valve V03 on the pipeline GD-003 is closed in interlocking. At the same time when the screw feeding motor and the liquid carbon dioxide conveying pump P002 are started, the material stirring motor is started synchronously to realize the sufficient stirring and slurry of the solid-liquid mixture.

[0050] When the solid material in the screw feeding diluter V001 is slurry, the solid-liquid mixture material conveying pump P001 is started, and the switch valve V05 on the pipeline GD-005 and the switch valve V10 on the pipeline GD-009 are opened synchronously, so that the slurry in the screw feeding diluter V001 is conveyed to the first discharge tank V002A by the pump; in order to ensure the stability of the solid-liquid mixture material conveying pump P001, the switch valve V09 on the gas phase balance pipeline GD-008 is opened before the pump is started, and when the readings of the first pressure gauge PIAS-001 on the screw feeding diluter V001 and the second pressure gauge PIAS-002A on the discharge tank V002A are consistent, the switch valve V09 is closed, the solid-liquid mixture material conveying pump P001 is started to convey the slurry, and when the second liquid level meter LIAS-002A on the first discharge tank V002A indicates that a certain liquid level is reached, the switch valve V10 on the feeding pipeline GD-009 is closed in linkage, and the conveying of the slurry is completed. In order to avoid the residual material in the solid-liquid mixture material conveying pipeline from blocking the pipeline, the pipeline GD-004 is used to blow off the material after the material conveying is completed.

[0051] The slurry is a solid-liquid mixture of solid material and liquid carbon dioxide, which realizes complete separation of the solid-liquid mixture in the first discharge kettle V002A, ensures that the solid material discharged from the bottom of the first discharge kettle V002A does not contain carbon dioxide, and needs to be depressurized and gasified to realize solid-liquid separation and recycling of carbon dioxide. The following process is used to achieve this: start the discharge kettle stirring motor V002-07 on the first discharge kettle V002A to loosen the material in the discharge kettle from bottom to top, and at the same time open the switch valve V11 on the discharge pipeline GD-010 on the first discharge kettle V002A. At this time, the gasified carbon dioxide in the first discharge kettle V002A will flow into the gas phase buffer tank V003; at this time, the pressure gauge PIAS-003 on the gas phase buffer tank V003 will rise to more than 5mpa, which will chain start the liquefied compressor C002 and open the switch valve V26 on the liquefied compressor outlet pipeline. Under the suction compression of the liquefied compressor, the gas phase carbon dioxide in the gas phase buffer tank V003 will be gradually compressed into the liquid carbon dioxide storage tank V004. The total process is that the liquid carbon dioxide in the first discharge kettle V002A is gasified into gaseous carbon dioxide, then flows into the gas phase buffer tank V003, and then is compressed into the liquid carbon dioxide storage tank V004 by the liquefied compressor C002. This process continues until all the liquid carbon dioxide in the first discharge kettle V002A is gasified under the dispersion of the gradually changing spiral blade V002-02. At this time, the pressure gauge PIAS-002A on the first discharge kettle V002A chain closes the switch valve V11 on the discharge pipeline GD-010, and when the pressure gauge PIAS-003 on the gas phase buffer tank V003 at the back end indicates less than 5mpa, the liquefied compressor C002 and the switch valve V26 on the discharge pipeline GD-019 are also chain stopped.The above process realizes complete gasification of liquid carbon dioxide in the first discharge kettle V002A, but there is still gas-phase carbon dioxide at a pressure of 5 mpa in the first discharge kettle V002A. In order to avoid the high-pressure gas-phase carbon dioxide in the first discharge kettle V002A being discharged to the outside when the solid material is discharged from the bottom of the first discharge kettle V002A, resulting in loss of carbon dioxide, the pressure in the first discharge kettle V002A needs to be further reduced to 0.1 mpa, which is realized by the following process: At this time, the second discharge kettle V002A is in an empty state, and the switch valves V12, V14 and V17 are opened. The gas-phase carbon dioxide in the first discharge kettle V002A will flow to the second discharge kettle V002B by itself. When the pressure in the first discharge kettle V002A is consistent with the pressure in the second discharge kettle V002B, the pressure in the first discharge kettle V002A and the second discharge kettle V002B is both 1.25 mpa. At this time, the switch valve V14 is closed, the switch valve V15 is opened, and the forward-reverse compressor C001 is started. The gas-phase carbon dioxide in the first discharge kettle V002A is sucked into the second discharge kettle V002B. When the pressure value of the pressure gauge PIAS-002A on the first discharge kettle V002A is reduced to 0.1 mpa, the switch valves V12, V15 and V17 are closed. At this time, the first discharge kettle bottom switch valve V13 can be opened, and the discharge kettle stirring motor V002-07 is started in reverse rotation. Under the rotation of the gradual change spiral blade V002-02, the solid material is discharged. The situation of the second discharge kettle V002B is similar and will not be described here.

[0052] The above process completes the purpose of conveying the solid material from material position one to material position two, and the carbon dioxide is recycled. The liquefied compressor C002 compresses the 5mpa gas phase carbon dioxide in the gas phase buffer tank V003 to 6mpa and enters the liquid carbon dioxide storage tank V004. In order to prevent the material from flowing backward in the pipeline GD-019 when the liquefied compressor C002 suddenly stops, a check valve V27 is arranged on the pipeline. The material compressed by the liquefied compressor C002 will have a certain temperature rise. A coil is arranged on the outer wall of the liquid carbon dioxide storage tank V004, one end of the coil is connected with the cooling circulating water inlet pipeline GD-022, and the other end of the coil is connected with the cooling circulating water outlet pipeline GD-021, which is used for cooling the material in the liquid carbon dioxide storage tank V004. A thermometer TIAS-001 is arranged on the liquid carbon dioxide storage tank V004, which is connected with the on-off valve V33 on the cooling circulating water inlet pipeline GD-022. When the reading of the thermometer TIAS-001 on the liquid carbon dioxide storage tank is greater than a specified value, the on-off valve V33 is opened to cool, and when the reading of the thermometer TIAS-001 is less than a specified value, the on-off valve V33 is closed, so that the temperature in the liquid carbon dioxide storage tank is kept constant within a certain range. In order to increase the disturbance of the liquid in the liquid carbon dioxide storage tank V004 and enhance the heat exchange effect, the pipeline GD-019 extends below the liquid level of the liquid carbon dioxide storage tank V004, and in addition, a return pipeline GD-024 is additionally arranged at the outlet end of the liquid carbon dioxide conveying pump P002, which also extends below the liquid level of the liquid carbon dioxide storage tank V004, both of which are used to increase the disturbance of the liquid in the liquid carbon dioxide storage tank V004 and enhance the heat exchange effect. During the operation of the solid material conveying system, a small amount of carbon dioxide will still be lost. A liquid carbon dioxide feeding pipeline GD-020 is arranged on the liquid carbon dioxide storage tank V004, and an on-off valve V31 is arranged on the feeding pipeline. The on-off valve is connected with the liquid level meter LIAS-003 on the liquid carbon dioxide storage tank V004. When the liquid level meter LIAS-003 indicates that the liquid level is below a certain value, the on-off valve V31 on the liquid carbon dioxide feeding pipeline GD-020 is opened, and when the liquid level meter LIAS-003 indicates that the liquid level reaches a certain level, the on-off valve V31 is closed, so as to ensure the stability of the amount of liquid carbon dioxide in the system.

[0053] The above solid material conveying method effectively realizes the completely sealed conveying of the toxic wet material with irritating odor and toxic odor.

[0054] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A screw feed diluter characterized by, The diluter shell is provided with a material outlet, a first gas phase balance port, a second gas phase balance port and a liquid carbon dioxide inlet, the screw feeding device includes a screw feeding cylinder, a screw blade and a screw feeding motor, the screw feeding cylinder is arranged inside the diluter shell and its lower end extends to the outside of the diluter shell for serving as an inlet for solid materials, the upper end of the screw feeding cylinder is provided with a plurality of solid material outlets on the periphery for the solid materials to enter the inside of the diluter shell from the screw feeding cylinder, the feeding non-return device is arranged at each solid material outlet, the screw blade is arranged in the screw feeding cylinder for pushing the solid materials to enter the diluter shell from bottom to top, the screw feeding motor is arranged on the top of the screw feeding cylinder for driving the screw blade to rotate, the material stirring device includes a material stirring support and a material stirring motor, the material stirring support is arranged in the cavity of the diluter shell, the material stirring motor is arranged outside the diluter shell and connected with the material stirring support through a material stirring shaft, the annular overflow baffle is arranged at the bottom of the diluter shell and located on the periphery of the screw feeding cylinder, after the solid materials and the liquid carbon dioxide enter the cavity of the diluter shell, they all enter the internal space area of the annular overflow baffle, the solid materials are fully slurried under the stirring of the material stirring support, the slurried materials overflow through the annular overflow baffle to the area formed by the annular overflow baffle and the inner side wall of the diluter shell, and then are delivered to the discharge kettle through the material outlet.

2. The screw feed diluter of claim 1, wherein, The feeding non-return device includes a feeding pipe, one end of the feeding pipe is communicated with the inner cavity of the screw feeding cylinder, the other end of the feeding pipe is provided with a sealing flange plate and a sealing flange cover, the outer side of the sealing flange plate is provided with a circular flange plate hard sealing pad, the surface of the flange plate hard sealing pad is inlaid with a flange plate soft sealing pad, the inner surface of the sealing flange cover is provided with a flange cover sealing pad corresponding to the flange plate soft sealing pad, the outer side wall of the feeding pipe is provided with a plurality of springs, one end of the spring is connected with a stress fixed plate, the stress fixed plate is arranged on the outer side wall of the end of the feeding pipe connected with the screw feeding cylinder, the other end of the spring is connected with the sealing flange cover.

3. The screw feed diluter of claim 1, wherein, The bottom of the material stirring support is provided with a branch structure, part of the branch structure is located in the internal space area of the annular overflow baffle and the other part of the branch structure is located in the area formed by the annular overflow baffle and the inner side wall of the diluter shell, a plurality of stirring support lugs are arranged on the branch structure of the material stirring support.

4. A solid material conveying system, characterized by The screw feeding diluter comprises a solid-liquid mixed material conveying pump, a discharge kettle, a forward-reverse compressor, a gas phase buffer tank, a liquefaction compressor, a liquid carbon dioxide storage tank and a liquid carbon dioxide conveying pump, the discharge kettle comprises a first discharge kettle and a second discharge kettle; the bottom of the leg of the screw feeding diluter is provided with a weighing module, the first gas phase balance pipeline of the screw feeding diluter is connected with the gas phase balance pipelines of the first discharge kettle and the second discharge kettle respectively; the material outlet of the screw feeding diluter is connected with the inlet of the solid-liquid mixed material conveying pump through a discharge pipeline, the outlet of the solid-liquid mixed material conveying pump is connected with the slurry feeding pipelines of the first discharge kettle and the second discharge kettle through discharge pipelines respectively; the gas phase discharge pipelines of the first discharge kettle and the second discharge kettle are connected with the gas phase feeding pipeline of the gas phase buffer tank, the discharge pipelines of the first discharge kettle and the second discharge kettle are provided with a forward-reverse compressor and a compressor control system; the outlet pipeline of the gas phase buffer tank is connected with the inlet of the liquefaction compressor, the outlet pipeline of the liquefaction compressor extends below the liquid level of the liquid carbon dioxide storage tank, the gas phase carbon dioxide pipeline of the liquid carbon dioxide storage tank is connected with the second gas phase balance pipeline of the screw feeding diluter, the liquid outlet of the liquid carbon dioxide storage tank is connected with the inlet of the liquid carbon dioxide conveying pump through a first liquid carbon dioxide discharge pipeline, and the outlet of the liquid carbon dioxide conveying pump is connected with the liquid carbon dioxide inlet of the screw feeding diluter through a second liquid carbon dioxide discharge pipeline; the screw feeding diluter, the first discharge kettle and the second discharge kettle are all provided with a conical material collecting groove below.

5. The solid material conveying system of claim 4, wherein, The second liquid carbon dioxide outlet pipeline is provided with an inlet flow meter and an on-off valve V01, the spiral feed diluter is provided with a first liquid level meter and a first pressure gauge, the second gas phase balance pipeline of the spiral feed diluter is provided with an on-off valve V03, the liquid carbon dioxide storage tank is provided with a fifth pressure gauge, the first liquid level meter is interlocked with the inlet flow meter, the on-off valve V01, a weighing module and a rotating speed signal of a spiral feed motor, and the first pressure gauge and the fifth pressure gauge are both interlocked with the on-off valve V03; the first outlet kettle is provided with a second liquid level meter and a second pressure gauge, the second liquid level meter is interlocked with an on-off valve V10 on a slurry inlet pipeline of the first outlet kettle, and an outlet pipeline of the first outlet kettle is provided with an on-off valve V11; the second outlet kettle is provided with a third liquid level meter and a third pressure gauge, the third liquid level meter is interlocked with an on-off valve V19 on a slurry inlet pipeline of the second outlet kettle, and an outlet pipeline of the second outlet kettle is provided with an on-off valve V18; the compressor control system comprises a gas phase balance pipeline A, a gas phase balance pipeline B and a gas phase balance pipeline C, two ends of the gas phase balance pipeline A are connected with a gas phase material outlet of the first outlet kettle and one end of the forward-reverse compressor respectively, and the gas phase balance pipeline A is provided with an on-off valve V12 and an on-off valve V15; two ends of the gas phase balance pipeline B are connected with a gas phase material outlet of the second outlet kettle and the other end of the forward-reverse compressor respectively, and the gas phase balance pipeline B is provided with an on-off valve V17 and an on-off valve V16; two ends of the gas phase balance pipeline C are connected with the gas phase balance pipeline A and the gas phase balance pipeline B respectively, and the gas phase balance pipeline C is provided with an on-off valve V14; a rotating speed signal of the forward-reverse compressor is interlocked with the on-off valve V11, the on-off valve V12, the on-off valve V14, the on-off valve V17, the on-off valve V18, the second pressure gauge and the third pressure gauge; the gas phase buffer tank is provided with a fourth pressure gauge, the fourth pressure gauge is interlocked with a start-stop signal switch of the liquefied compressor and an on-off valve V26 on an outlet pipeline of the liquefied compressor; the liquid carbon dioxide storage tank is provided with a thermometer and a fourth liquid level meter, the thermometer is interlocked with an on-off valve V33 on a cooling circulating water inlet pipeline, and the fourth liquid level meter is interlocked with an on-off valve V31 on a liquid carbon dioxide feeding pipeline.

6. The solid material conveying system of claim 5, wherein, A purge pipeline is arranged between a gas phase carbon dioxide pipeline of the liquid carbon dioxide storage tank and an outlet pipeline of the spiral feed diluter, the purge pipeline is provided with a purge flow meter and an adjusting valve V07, and the purge flow meter is interlocked with the adjusting valve V07; an outlet of the liquid carbon dioxide conveying pump is connected with a backflow pipeline, and the backflow pipeline extends into the liquid carbon dioxide storage tank below a liquid level.

7. The solid material conveying system of claim 6, wherein, Flow restriction orifices are arranged on the first gas phase balance pipeline, the gas phase balance pipeline C, a gas phase inlet pipeline of the gas phase buffer tank and a second gas phase balance pipeline of the spiral feed diluter; metal hoses are arranged on pipelines connected with the spiral feed diluter.

8. The solid material conveying system of claim 7, wherein, The lower part of the discharge kettle is a conical structure, and the inside of the discharge kettle is provided with gradually changing spiral blades capable of rotating forward and reversely.

9. A method of conveying a solid material, characterized by, The solid material conveying system as claimed in claim 8 is used to convey solid material, and the conveying method is as follows: The screw feeding motor is started to drive the spiral blades to rotate, so that the solid material enters the screw feeding diluter cavity from the conical material collecting groove at the material position one; the liquid carbon dioxide conveying pump is started to convey the liquid carbon dioxide in the liquid carbon dioxide storage tank to the screw feeding diluter cavity through the second liquid carbon dioxide discharge pipeline; in order to ensure the stability of the material conveying of the liquid carbon dioxide conveying pump, the switch valve V03 is opened before the pump is started, and the switch valve V03 is closed when the readings of the first pressure gauge and the fifth pressure gauge are consistent; the material stirring motor is started at the same time when the screw feeding motor and the liquid carbon dioxide conveying pump are started, so that the solid-liquid mixture is fully stirred and slurried; When the screw feeding diluter completes the slurry of the solid material, the solid-liquid mixture conveying pump is started, the switch valve V05 and the switch valve V10 are opened at the same time, the slurry in the screw feeding diluter is conveyed to the first discharge kettle through the pipeline by the solid-liquid mixture conveying pump; in order to ensure the stability of the material conveying of the solid-liquid mixture conveying pump, the switch valve V09 is opened before the solid-liquid mixture conveying pump is started, the switch valve V09 is closed when the readings of the first pressure gauge and the second pressure gauge on the first discharge kettle are consistent, the solid-liquid mixture conveying pump is started to convey the slurry, and when the second liquid level meter indicates that a certain liquid level is reached, the switch valve V10 is closed in linkage to complete the conveying of the slurry; The solid-liquid mixture in the first discharge kettle is separated by the liquid carbon dioxide pressure reduction gasification separation method, specifically: the discharge kettle stirring motor on the first discharge kettle is started to make the material in the discharge kettle loose from bottom to top, and the switch valve V11 is opened at the same time, at this time, the carbon dioxide gasified in the first discharge kettle will flow to the gas phase buffer tank; at this time, the fourth pressure gauge on the gas phase buffer tank will rise to exceed the set value, the fourth pressure gauge starts the liquefied compressor in linkage and opens the switch valve V26, under the suction compression of the liquefied compressor, the gas phase carbon dioxide in the gas phase buffer tank will be gradually compressed to the liquid carbon dioxide storage tank; when the liquid carbon dioxide in the first discharge kettle is all gasified under the dispersion action of the gradually changing spiral blades, the second pressure gauge closes the switch valve V11 in linkage, and when the fourth pressure gauge on the gas phase buffer tank at the back end indicates that the set value is lower, the liquefied compressor and the switch valve V26 are also stopped in linkage. In order to avoid the high pressure gas carbon dioxide in the first discharge kettle from being discharged to the outside of the kettle when the solid material is discharged from the bottom, causing the loss of carbon dioxide, the pressure in the first discharge kettle needs to be further reduced to 0.1 MPa, which is realized by the following process: At this time, the second discharge kettle is in an idle state, the switch valves V12, V14 and V17 are opened, and the gas phase carbon dioxide in the first discharge kettle will flow into the second discharge kettle by itself. When the pressure values of the first discharge kettle and the second discharge kettle are consistent, the pressures in the first discharge kettle and the second discharge kettle are both changed to 1.25 MPa. At this time, the switch valve V14 is closed, the switch valve V15 is opened, and the forward and reverse compressor is started to suck the gas phase carbon dioxide in the first discharge kettle into the second discharge kettle. When the pressure value of the second pressure gauge is reduced to 0.1 MPa, the switch valves V12, V15 and V17 are closed. At this time, the first discharge kettle bottom switch valve V13 is opened, and the discharge kettle stirring motor is reversed to discharge the solid material to the conical material collection tank at material position two under the rotation of the gradual spiral blade. After the solid material is transported from the material position one to the material position two, the carbon dioxide is recycled and utilized: The gas phase carbon dioxide in the gas phase buffer tank is compressed by the liquefied compressor and enters the liquid carbon dioxide storage tank. When the temperature gauge reading on the liquid carbon dioxide storage tank is greater than a specified value, the switch valve V33 is opened to cool down. When the temperature gauge reading is less than a specified value, the switch valve V33 is closed to keep the temperature in the liquid carbon dioxide storage tank constant within a certain range. When the fourth liquid level gauge indicates a value lower than a certain value, the switch valve V31 is opened. When the fourth liquid level gauge indicates a certain liquid level, the switch valve V31 is closed to ensure the stability of the amount of liquid carbon dioxide in the system.

10. The method of claim 9, wherein The solid material feed amount entering the cavity of the spiral feed diluter is measured by the weighing module, and the liquid carbon dioxide feed amount is measured by the feed flowmeter and is proportional to the measurement value of the weighing module. In order to avoid the residual material in the solid-liquid mixed material conveying pipeline from blocking the pipeline, the material is purged after the material conveying is completed.

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