A solids conveying system with gas recovery

Abstract

The utility model discloses a solid delivery system with gas recovery belongs to chemical and nonferrous metal technical field. Among them including material's delivery unit and gas's primary filtration, fine washing unit, every unit all mutually cooperate, mutual restriction, utilize the gravity of material in material delivery unit low pressure bin and pressure buffer bin and deliver material, and the pressure buffer bin is filled with high pressure gas, utilizes material self gravity and the environment of micro positive pressure and delivers material in pressure buffer bin to the material receiving bin, and after the delivery is completed, carries out primary filtration and fine washing to the gas with solid particle in pressure buffer bin, the solid particle produced in primary filtration process continues to return to low pressure bin and is reused, and the impurity in fine washing process is directly discharged from the system, and the gas after fine washing is compressed by compressor and is stored back to high pressure tank, continues to use circularly, and the working process of system is simple and convenient, and the process of recovery is also energy saving and environmental protection.

Description

Technical Field

[0001] The present utility model relates to the technical fields of chemical industry and non-ferrous metals, and specifically relates to a solid conveying system with gas recovery. Background Art

[0002] In the field of coal chemical industry, stable conveying of materials is a key link to ensure continuous production operation. For powder materials, a pneumatic conveying system supporting a pressurized gasification process is often adopted to realize efficient material transfer through a specific pressure-rising fluidization method. To avoid potential safety hazards during storage and conveying, the conveying operation needs to be completed under an inert gas atmosphere. During the conveying process, the conventional process directly discharges part of the conveying gas to the atmosphere to balance the pressure of the buffer bin, resulting in serious waste of gas resources. At the same time, solid particles carried in the discharged gas will also affect the environment, failing to meet environmental protection emission requirements.

[0003] CN117104721A discloses a powder conveying system, which includes a controller, a material storage assembly, an injection assembly, a metering assembly and a timing assembly, wherein the controller is in signal connection with the injection assembly, the metering assembly and the timing assembly. In this solution, the weight of the hopper is monitored in real time through the metering assembly. When a blockage forms inside the hopper, the material flow inside the hopper decreases, and the weight of the hopper increases. The metering assembly detects whether there is a blockage inside the hopper by obtaining the weight change of the hopper, and sends a second signal to the controller, so that the controller responds to the second signal to control the injection assembly to inject the inside of the hopper, so as to blow away the blocked material inside the hopper; in addition, the hopper is subjected to timed injection through the timing assembly and the controller, which can reduce hopper blockage caused by slow material accumulation.

[0004] CN105016085A discloses a quartz powder conveying system, which includes a discharging hopper with a butterfly valve installed at the outlet end, the outlet end of the discharging hopper is communicated with a spherical launching tank, the lower part of the spherical launching tank is communicated with an external air source pipe, a plurality of branch pipes are communicated on the external air source pipe, the outlet end of the spherical launching tank is communicated with one end of a conveying pipeline through a pressure valve, and the other end of the conveying pipeline is communicated with a powder storage tank. In the quartz powder conveying system provided by the present invention, the quartz powder entering from the discharging hopper is mixed and uniformly adjusted through the spherical launching tank communicated with the external air source pipe. When the air pressure in the spherical launching tank reaches a fixed value, the pressure valve opens, and the adjusted quartz powder is conveyed into the powder storage tank for use in the next process, so that the powder is mixed and conveyed in a closed environment, will not diffuse into the air to cause damage to human health and equipment, and also saves quartz powder and reduces production costs.

[0005] In material conveying systems such as those described above and in existing technologies, the continuity and uniformity of material conveying are often maintained by setting up "buffer silos". If the conveyed gas is directly discharged into the atmosphere, it will cause pollution and waste of resources. However, the complexity of the structure of the gas recovery device during the conveying process brings many inconveniences to actual operation. The complex and inefficient gas handling methods during the conveying process are still problems that need to be solved. Utility Model Content

[0006] To address the above problems, this utility model provides a solid conveying system with gas recovery. By setting up a gas recovery unit, solid materials are conveyed using their own gravity. The gas recovered during the conveying process can be reused, greatly saving compressed gas resources and improving the conveying efficiency of solid materials. At the same time, there is no spillage of solid materials, which improves the safety of the system during use.

[0007] This utility model provides a solid conveying system with gas recovery, which includes a material conveying unit, a gas recovery unit and a gas washing unit according to the gas flow direction; The material conveying unit, the gas recovery unit, and the gas cleaning unit are connected in sequence, and the gas cleaning unit is also connected to the material conveying unit; The material conveying unit includes a low-pressure chamber, a pressure buffer chamber, a receiving chamber, a compressor, and a high-pressure tank; The gas recovery unit includes a gas-solid filter, an exhaust valve, a gas storage tank, and a dust storage tank; The gas cleaning unit includes a wet cleaning tank, a circulating pump, a first cooler, a first separation tank, a second cooler, and a second separation tank.

[0008] Furthermore, the low-pressure chamber, the pressure buffer chamber, the receiving chamber, the high-pressure tank, the air storage tank, the dust storage tank, the first separation tank, and the second separation tank are all equipped with pressure gauges.

[0009] Furthermore, the low-pressure chamber includes an inlet and an outlet, with the material entering through the inlet.

[0010] Furthermore, the pressure buffer chamber includes a feed inlet, a discharge outlet, an air inlet, and an exhaust outlet.

[0011] Furthermore, the inlet of the pressure buffer chamber is connected to the outlet of the low-pressure chamber via a pipe, and a valve is installed on the pipe connecting the pressure buffer chamber and the low-pressure chamber to control the material flow from the low-pressure chamber to the pressure buffer chamber.

[0012] Furthermore, the vent of the pressure buffer chamber is used to discharge gas. When material enters the pressure buffer chamber, the vent in the pressure buffer chamber is opened to discharge all or part of the gas in the system.

[0013] Furthermore, the working pressure of the pressure buffer chamber is 0.3-9.5 MPa, and the temperature is 20-145℃.

[0014] Furthermore, the receiving bin includes an inlet and an outlet.

[0015] Furthermore, the inlet of the receiving hopper and the outlet of the pressure buffer hopper are connected by a pipe, and a valve is installed on the pipe connecting the receiving hopper and the pressure buffer hopper to control the material flow from the pressure buffer hopper to the receiving hopper.

[0016] Furthermore, the material in the receiving bin enters the next stage of operation through the discharge port of the receiving bin.

[0017] Furthermore, the compressor includes an air inlet and an air outlet.

[0018] Furthermore, the compressor is a single device or a group of devices.

[0019] Furthermore, the high-pressure tank includes an air inlet and an air outlet.

[0020] Furthermore, the air inlet of the high-pressure tank is connected to the air outlet of the compressor via a pipe, the air outlet of the high-pressure tank is connected to the air inlet of the pressure buffer chamber via a pipe, and a valve is installed on the pipe between the high-pressure tank and the pressure buffer chamber.

[0021] Furthermore, the gas-solid filter includes an air inlet, an air outlet, and a material outlet.

[0022] Furthermore, the air inlet of the gas-solid filter is connected to the air outlet of the pressure buffer chamber via a pipeline, a valve is installed on the pipeline between the gas-solid filter and the pressure buffer chamber, and the discharge outlet of the gas-solid filter is connected to the inlet of the low-pressure chamber via a pipeline or equipment, so that the filtered solid material continues to return to the low-pressure chamber for reuse.

[0023] Furthermore, the solid content of the gas discharged from the outlet of the gas-solid filter is 5-20 mg / Nm³. 3 .

[0024] Furthermore, the exhaust valve is connected to the outlet of the gas-solid filter, allowing the gas in the gas-solid filter to be released into the atmosphere.

[0025] Furthermore, the gas storage tank includes an air inlet, an air outlet, and a material outlet.

[0026] Furthermore, the air inlet of the gas storage tank is connected to the air outlet of the gas-solid filter via a pipe.

[0027] Furthermore, the dust storage tank includes an inlet and an outlet.

[0028] Furthermore, the inlet of the dust storage tank is connected to the outlet of the gas storage tank via a pipe or equipment, the outlet of the dust storage tank is connected to the inlet of the low-pressure chamber via a pipe, and the solid material generated in the gas storage tank continues to return to the low-pressure chamber for reuse.

[0029] Furthermore, the wet washing tank includes an air inlet, an air outlet, a water outlet, and a circulating water outlet.

[0030] Furthermore, the air inlet of the wet washing tank is connected to the air outlet of the air storage tank via a pipe.

[0031] Furthermore, the spray water in the wet washing tank is recycled through the circulating pump.

[0032] Furthermore, the circulating pump includes an inlet and an outlet.

[0033] Furthermore, the inlet of the circulating pump is connected to the outlet of the wet washing tank via a pipe, and the outlet of the circulating pump is connected to the circulating water outlet of the wet washing tank via a pipe.

[0034] Furthermore, the pipe connecting the outlet of the circulating pump to the circulating water inlet of the wet washing tank is also equipped with an injection port and a drain port. The injection port is used to inject spray water into the wet washing tank, and the drain port is used to discharge the solid and dissolved impurities washed out of the wet washing tank.

[0035] Furthermore, the first cooler includes an air inlet and an air outlet.

[0036] Furthermore, the air inlet of the first cooler is connected to the air outlet of the wet washing tank via a pipe.

[0037] Furthermore, the first separator includes an air inlet, an air outlet, and a liquid outlet.

[0038] Furthermore, the air inlet of the first separator is connected to the air outlet of the first cooler via a pipe; The solids and dissolved impurities separated in the first separation tank are discharged through the drain port of the first separation tank.

[0039] Furthermore, the second cooler includes an air inlet and an air outlet.

[0040] Furthermore, the air inlet of the second cooler is connected to the air outlet of the first separator via a pipe.

[0041] Furthermore, the second separator includes an air inlet, an air outlet, and a liquid outlet.

[0042] Furthermore, the air inlet of the second separator is connected to the air outlet of the second cooler via a pipe, and the air outlet of the second separator is connected to the air inlet of the compressor via a pipe.

[0043] Furthermore, the gas in the second separator enters the compressor through the outlet of the second separator, is compressed, and then enters the pressure buffer chamber through the high-pressure tank for reuse.

[0044] Furthermore, the solid and dissolved impurities separated in the second separation tank are discharged through the drain port of the second separation tank.

[0045] Furthermore, the solid content of the gas discharged from the outlet of the second separator is ≤1 mg / Nm³. 3 Dew point ≤ -40℃.

[0046] The beneficial effects of this utility model are: This invention achieves multiple advantages in solid conveying and gas recovery through a reasonable device layout and process design. The combined design of the low-pressure chamber and the pressure buffer chamber, relying on the principle of gravity conveying, makes the transfer of solid materials more stable and orderly, effectively avoiding blockages and losses during the conveying process. At the same time, the valve control between the chambers ensures the stable switching of the system pressure environment, laying a good foundation for subsequent conveying and gas recovery. The gas-solid filter realizes the initial separation of solid materials in the gas. Combined with the auxiliary collection of the dust storage tank, the separated solid materials can be returned to the low-pressure chamber for reuse, which reduces material waste and reduces the content of solid impurities in the gas, thus reducing the load on subsequent gas treatment.

[0047] As a temporary gas storage device, the gas storage tank plays a role in balancing gas flow and stabilizing system pressure, avoiding pressure fluctuations in the gas processing stage. At the same time, its matching dust storage tank can collect solid particles that settle during the temporary storage process, further improving the gas purification effect. The wet washing tank uses a combination of fresh water and circulating water to efficiently remove residual solid impurities and dissolved pollutants from the gas. The recycling design of the circulating water reduces water consumption, while the reasonable ratio of wastewater discharge and fresh water replenishment ensures the stability of the washing effect.

[0048] The combination of the first and second coolers with corresponding separation tanks, through multi-stage cooling and separation, effectively removes mist and condensate from the gas, significantly improving its dryness and purity, creating favorable conditions for gas compression and recovery. The cooperation between the compressor and the high-pressure tank enables pressurized storage of the purified gas, allowing it to be recycled for pressurizing the pressure buffer chamber, forming a complete gas recovery cycle system. This not only reduces the consumption of fresh gas and lowers operating costs but also reduces exhaust emissions, meeting energy conservation and environmental protection requirements. Through the synergistic effect of each device, the entire system achieves efficient solid material transport and gas recovery and reuse, balancing operational efficiency, resource conservation, and environmental benefits. In addition, this utility model is equipped with an exhaust valve, which is used to release air from the system when the system is started, or to temporarily relieve pressure when the system pressure is too high, thus ensuring the safety of the system. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the solid conveying system with gas recovery described in this utility model; The names of the labels in the diagram are as follows: A-Material conveying unit, B-Gas recovery unit, C-Gas washing unit, 1-Low-pressure chamber, 2-Pressure buffer chamber, 3-Receiving chamber, 4-Compressor, 5-High-pressure tank, 6-Gas-solid filter, 7-Exhaust valve, 8-Gas storage tank, 9-Dust storage tank, 10-Wet washing tank, 11-Circulating pump, 12-First cooler, 13-First separation tank, 14-Second cooler, 15-Second separation tank. Detailed Implementation

[0050] The utility model will be described in detail below with reference to the embodiments: This invention provides a solid conveying system with gas recovery. By setting up a gas recovery unit, solid materials are conveyed under gas pressure. At the same time, the recovered gas can be reused, which greatly saves compressed gas resources and improves the conveying efficiency of solid materials. In addition, there is no spillage of solid materials, which improves the safety of the system during use.

[0051] Example 1 This embodiment provides a solid conveying system with gas recovery, which includes a material conveying unit A, a gas recovery unit B, and a gas washing unit C, depending on the gas flow direction. The material conveying unit A, the gas recovery unit B, and the gas washing unit C are connected in sequence, and the gas washing unit C is also connected to the material conveying unit A. The material conveying unit A includes a low-pressure chamber 1, a pressure buffer chamber 2, a receiving chamber 3, a compressor 4, and a high-pressure tank 5. The gas recovery unit B includes a gas-solid filter 6, an exhaust valve 7, a gas storage tank 8, and a dust storage tank 9. The gas cleaning unit C includes a wet cleaning tank 10, a circulating pump 11, a first cooler 12, a first separation tank 13, a second cooler 14, and a second separation tank 15.

[0052] In this embodiment, the low-pressure chamber 1, the pressure buffer chamber 2, the receiving chamber 3, the high-pressure tank 5, the gas storage tank 8, the dust storage tank 9, the first separation tank 13, and the second separation tank 15 are all equipped with pressure gauges.

[0053] In this embodiment, the low-pressure chamber 1 includes an inlet and an outlet, and the material enters through the inlet of the low-pressure chamber 1.

[0054] The pressure buffer chamber 2 includes a feed inlet, a discharge outlet, an air inlet, and an exhaust outlet; The inlet of the pressure buffer chamber 2 is connected to the outlet of the low-pressure chamber 1 through a pipe. The pipe connecting the pressure buffer chamber 2 and the low-pressure chamber 1 is equipped with a valve to control the material flow from the low-pressure chamber 1 to the pressure buffer chamber 2. The exhaust port of the pressure buffer chamber 2 is used to discharge gas. When material enters the pressure buffer chamber 2, the exhaust port in the pressure buffer chamber 2 is opened to discharge all or part of the gas in the system.

[0055] The receiving bin 3 includes an inlet and an outlet; The inlet of the receiving bin 3 is connected to the outlet of the pressure buffer bin 2 via a pipe. A valve is installed on the pipe connecting the receiving bin 3 and the pressure buffer bin 2 to control the material flow from the pressure buffer bin 2 to the receiving bin 3. The material in the receiving bin 3 enters the next stage of operation through the discharge port of the receiving bin 3.

[0056] The compressor 4 includes an air inlet and an air outlet; The compressor 4 is a single device or a group of devices.

[0057] The high-pressure tank 5 includes an air inlet and an air outlet; The air inlet of the high-pressure tank 5 is connected to the air outlet of the compressor 4 through a pipe, and the air outlet of the high-pressure tank 5 is connected to the air inlet of the pressure buffer chamber 2 through a pipe. A valve is installed on the pipe between the high-pressure tank 5 and the pressure buffer chamber 2.

[0058] The gas-solid filter 6 includes an air inlet, an air outlet, and a material outlet; The air inlet of the gas-solid filter 6 is connected to the air outlet of the pressure buffer chamber 2 through a pipe. A valve is installed on the pipe between the gas-solid filter 6 and the pressure buffer chamber 2. The discharge port of the gas-solid filter 6 is connected to the inlet of the low-pressure chamber 1 through a pipe or equipment. The filtered solid material continues to return to the low-pressure chamber 1 for reuse.

[0059] The solid content of the gas discharged from the outlet of the gas-solid filter 6 is 5-20 mg / Nm³. 3 .

[0060] The exhaust valve 7 is connected to the outlet of the gas-solid filter 6, allowing the gas in the gas-solid filter 6 to be released into the atmosphere.

[0061] The gas storage tank 8 includes an air inlet, an air outlet, and a material outlet; The air inlet of the gas storage tank 8 is connected to the air outlet of the gas-solid filter 6 via a pipe.

[0062] The dust storage tank 9 includes an inlet and an outlet; The inlet of the dust storage tank 9 is connected to the outlet of the gas storage tank 8 through a pipe or equipment, and the outlet of the dust storage tank 9 is connected to the inlet of the low-pressure silo 1 through a pipe. The solid material generated in the gas storage tank 8 continues to return to the low-pressure silo 1 for reuse.

[0063] The wet washing tank 10 includes an air inlet, an air outlet, a water outlet, and a circulating water outlet; The air inlet of the wet washing tank 10 is connected to the air outlet of the air storage tank 8 via a pipe.

[0064] The spray water in the wet washing tank 10 is circulated by the circulating pump 11.

[0065] The circulating pump 11 includes an inlet and an outlet; The inlet of the circulating pump 11 is connected to the outlet of the wet washing tank 10 via a pipe, and the outlet of the circulating pump 11 is connected to the circulating water inlet of the wet washing tank 10 via a pipe.

[0066] The pipe connecting the outlet of the circulating pump 11 to the circulating water inlet of the wet washing tank 10 is also provided with an injection port and a drain port. The injection port is used to inject spray water into the wet washing tank 10, and the drain port is used to discharge the solid and dissolved impurities washed out of the wet washing tank 10.

[0067] The first cooler 12 includes an air inlet and an air outlet; The air inlet of the first cooler 12 is connected to the air outlet of the wet washing tank 10 via a pipe.

[0068] The first separation tank 13 includes an air inlet, an air outlet, and a liquid outlet; The air inlet of the first separator 13 is connected to the air outlet of the first cooler 12 via a pipe; The solids and dissolved impurities separated in the first separation tank 13 are discharged through the drain port of the first separation tank 13.

[0069] The second cooler 14 includes an air inlet and an air outlet; The air inlet of the second cooler 14 is connected to the air outlet of the first separator 13 via a pipe.

[0070] The second separator 15 includes an air inlet, an air outlet, and a liquid outlet; The air inlet of the second separator 15 is connected to the air outlet of the second cooler 14 through a pipe, and the air outlet of the second separator 15 is connected to the air inlet of the compressor 4 through a pipe. The gas in the second separator 15 enters the compressor 4 through the outlet of the second separator 15, is compressed, and then enters the pressure buffer chamber 2 through the high-pressure tank 5 for reuse. The solids and dissolved impurities separated in the second separation tank 15 are discharged through the drain port of the second separation tank 15.

[0071] The solid content of the gas discharged from the outlet of the second separator 15 is ≤1 mg / Nm³. 3 Dew point ≤ -40℃.

[0072] Example 2 This embodiment also provides a method for conveying solids using the aforementioned solid conveying system with gas recovery, comprising the following steps: Step 1: Material Transportation Pulverized coal at a temperature of 80℃ first enters the low-pressure silo 1 through the inlet of the pipeline. The low-pressure silo 1 is in a slightly positive pressure environment. The pressure inside the low-pressure silo 1 is the same as that inside the pressure buffer silo 2. The valve between the low-pressure silo 1 and the pressure buffer silo 2 is opened. The pulverized coal enters the pressure buffer silo 2 through the inlet of the pressure buffer silo 2 by gravity from the outlet of the low-pressure silo 1. After the conveying is completed, the valve between the low-pressure silo 1 and the pressure buffer silo 2 is closed. The high-pressure tank 5 is filled with CO2 gas at 80°C and 7 MPa. The valve between the high-pressure tank 5 and the pressure buffer chamber 2 is opened, and the CO2 gas enters the pressure buffer chamber 2 from the outlet of the high-pressure tank 5 through the inlet of the pressure buffer chamber 2, pressurizing the pressure buffer chamber 2. After the pressure in the pressure buffer chamber 2 reaches 4.9 MPa, the valve between the high-pressure tank 5 and the pressure buffer chamber 2 is closed. Open the valve between the pressure buffer chamber 2 and the receiving chamber 3. Pulverized coal enters the receiving chamber 3 through the inlet of the receiving chamber 3 by gravity and the slight positive pressure of the system from the outlet of the pressure buffer chamber 2. The pulverized coal at 80℃ and 4.9Mpa in the receiving chamber 3 enters the downstream through the outlet of the receiving chamber 3. Step 2, Pre-filtration of gas After the pulverized coal in the pressure buffer chamber 2 is transported to the receiving chamber 3, the pressure buffer chamber 2 is depressurized. First, the valves between the low-pressure chamber 1, the pressure buffer chamber 2, the receiving chamber 3, and the high-pressure tank 5 are closed. Then, the valve between the pressure buffer chamber 2 and the gas-solid filter 6 is opened. The CO2 gas containing some pulverized coal in the pressure buffer chamber 2 enters the gas-solid filter 6 through the air inlet of the gas-solid filter 6 from the exhaust port of the pressure buffer chamber 2 until the pressure in the pressure buffer chamber 2 is 0.04 MPa. At this time, the valve between the pressure buffer chamber 2 and the gas-solid filter 6 is closed. The CO2 gas containing some pulverized coal undergoes preliminary filtration in the gas-solid filter 6. The resulting solid pulverized coal is then discharged from the outlet of the gas-solid filter 6 and fed into the low-pressure chamber 1 for reuse. The filtered CO2 gas at 75°C and 0.038 MPa is discharged from the outlet of the gas-solid filter 6 and fed into the gas storage tank 8 for temporary storage. The solid content of the CO2 gas containing solid pulverized coal in the gas storage tank 8 is <20 mg / Nm³. 3 Since the CO2 gas containing solid pulverized coal has a high solid content and cannot be directly compressed and recovered, the CO2 gas containing solid pulverized coal in the gas storage tank 8 continues to enter the wet washing tank 10 through the gas outlet of the gas storage tank 8 and the gas inlet of the wet washing tank 10. Meanwhile, a small amount of pulverized coal in the gas storage tank 8 enters the dust storage tank 9 through the dust storage tank 9 through the dust storage tank 8 outlet. When the pulverized coal content in the dust storage tank 9 reaches the upper limit, the pulverized coal is made to enter the low-pressure silo 1 through the dust storage tank 9 outlet for reuse. Step 3, Gas Cleaning CO2 gas containing solid pulverized coal at 75℃ and 0.038 MPa enters the wet washing tank 10 and is washed by the ambient temperature demineralized water in the wet washing tank 10. The ambient temperature demineralized water and the recycled circulating water enter the wet washing tank 10 together through the circulating water inlet of the wet washing tank 10. The ambient temperature demineralized water is returned to the wet washing tank 10 for recycling by the circulating pump 11. The mass ratio of the ambient temperature demineralized water to the circulating water is approximately 30:1. The impurities (pulverized coal and dissolved impurities) generated during the wet washing process are discharged as wastewater at 45℃ and 0.3 MPa through the circulating pump 11. The replenishment mass ratio of wastewater to ambient temperature demineralized water is approximately 1:1.12 to maintain the solid content of the system circulating water. After wet washing, the CO2 gas enters the first cooler 12 through the outlet of the wet washing tank 10 and the inlet of the first cooler 12. Inside the first cooler 12, it is cooled to 40°C and 0.032 MPa by cooling water at 32°C and 0.42 MPa. The cooled CO2 gas then enters the first separation tank 13 through the inlet of the first separation tank 13 through the outlet of the first cooler 12. In the first separation tank 13, it separates and generates mist. After settling, the mist condenses and is discharged from the drain outlet of the first separation tank 13. The separated CO2 gas then enters the second cooler 14 through the inlet of the first separation tank 13. The CO2 gas is then cooled a second time in the second cooler 14, where it is cooled by liquid ammonia at 10°C and 1.6 MPa. The cooled CO2 gas exits the outlet of the second cooler 14 and enters the inlet of the second separator 15 for further separation. Similarly, mist is generated within the second separator 15. After settling, the mist condenses and is discharged from the drain outlet of the second separator 15. The separated CO2 gas exits from the outlet of the second separator 15. The temperature of the CO2 gas exiting the outlet of the second separator 15 is 5°C, the pressure is 0.01 MPa, and the solid content is ≤1 mg / Nm³. 3 Dew point ≤ -40℃; The gas discharged from the outlet of the second separator 15 enters the inlet of the compressor 4 through a pipeline along with fresh CO2 compressed gas. The gas is pressurized to 7 MPa by the compressor 4 to obtain high-pressure gas with qualified pressure and composition.

[0073] The high-pressure CO2 gas discharged from the compressor 4 flows through the outlet and into the inlet of the high-pressure tank 5 via a pipeline, so as to be used for intermittent pressurization of the pressure buffer chamber 2.

[0074] Example 3 This embodiment also provides a method for conveying solids using the aforementioned solid conveying system with gas recovery, comprising the following steps: Step 1: Material Transportation At normal temperature and pressure, pyrite concentrate first enters the low-pressure chamber 1 through the inlet of the low-pressure chamber 1 via a pipeline. The low-pressure chamber 1 is in a slightly positive pressure environment, and the pressure inside the low-pressure chamber 1 is the same as that inside the pressure buffer chamber 2. The valve between the low-pressure chamber 1 and the pressure buffer chamber 2 is opened, and the pyrite concentrate enters the pressure buffer chamber 2 through the inlet of the pressure buffer chamber 2 by gravity from the outlet of the low-pressure chamber 1. After the conveying is completed, the valve between the low-pressure chamber 1 and the pressure buffer chamber 2 is closed. The high-pressure tank 5 is filled with N2 gas at room temperature and 1 MPa. The valve between the high-pressure tank 5 and the pressure buffer chamber 2 is opened, and the N2 gas enters the pressure buffer chamber 2 from the outlet of the high-pressure tank 5 through the inlet of the pressure buffer chamber 2, pressurizing the pressure buffer chamber 2. After the pressure of the pressure buffer chamber 2 reaches 0.7 MPa, the valve between the high-pressure tank 5 and the pressure buffer chamber 2 is closed. Open the valve between the pressure buffer chamber 2 and the receiving chamber 3. The pyrite concentrate enters the receiving chamber 3 through the inlet of the receiving chamber 3 by gravity and the slight positive pressure of the system from the outlet of the pressure buffer chamber 2. The pyrite concentrate in the receiving chamber 3 enters the downstream through the outlet of the receiving chamber 3. Step 2, Pre-filtration of gas After the pyrite concentrate in the pressure buffer chamber 2 is transported to the receiving chamber 3, the pressure buffer chamber 2 is depressurized. First, the valves between the low-pressure chamber 1, the pressure buffer chamber 2, the receiving chamber 3, and the high-pressure tank 5 are closed. Then, the valve between the pressure buffer chamber 2 and the gas-solid filter 6 is opened. The N2 gas containing part of the pyrite concentrate in the pressure buffer chamber 2 enters the gas-solid filter 6 through the air inlet of the gas-solid filter 6 from the exhaust port of the pressure buffer chamber 2 until the pressure in the pressure buffer chamber 2 is 0.03 MPa. At this time, the valve between the pressure buffer chamber 2 and the gas-solid filter 6 is closed. N2 gas containing a portion of pyrite concentrate undergoes preliminary filtration in the gas-solid filter 6. The resulting solid pyrite concentrate is then discharged from the outlet of the gas-solid filter 6 and fed into the low-pressure chamber 1 for reuse. Meanwhile, the filtered N2 gas at room temperature and 0.028 MPa is temporarily stored in the gas storage tank 8 through the inlet of the gas storage tank 8, while the solid content of the N2 gas containing the solid pyrite concentrate in the gas storage tank 8 is <20 mg / Nm³. 3Since the N2 gas containing solid pyrite concentrate has a high solid content and cannot be directly compressed and recovered, the N2 gas containing solid pyrite concentrate in the gas storage tank 8 continues to enter the wet washing tank 10 through the gas outlet of the gas storage tank 8 and the gas inlet of the wet washing tank 10. Meanwhile, a small amount of pyrite concentrate in the gas storage tank 8 enters the dust storage tank 9 through the dust storage tank 9 inlet through the gas storage tank 8 outlet. When the pyrite concentrate content in the dust storage tank 9 reaches the upper limit, the intermittent pressurization method is used to make the pyrite concentrate enter the low-pressure chamber 1 through the dust storage tank 9 outlet for reuse. Step 3, Gas Cleaning After N2 gas containing solid pyrite concentrate at room temperature and 0.028 MPa enters the wet washing tank 10, it is washed by room temperature water in the wet washing tank 10. The room temperature water and the recycled circulating water enter the wet washing tank 10 together through the circulating water port of the wet washing tank 10. The room temperature water is returned to the wet washing tank 10 for recycling by the circulating pump 11. The mass ratio of the room temperature water to the circulating water is about 30:1. The impurities generated during the wet washing process (pyrite concentrate and dissolved impurities) are discharged as wastewater at room temperature and 0.3 MPa through the circulating pump 11. The replenishment mass ratio of wastewater to room temperature water is about 1:1.12 to maintain the solid content of the system circulating water. After wet washing, the N2 gas enters the first cooler 12 through the outlet of the wet washing tank 10 and the inlet of the first cooler 12. Inside the first cooler 12, it is cooled to 15°C and 0.02 MPa by cooling water at 10°C and 0.3 MPa. The cooled N2 gas then enters the first separation tank 13 through the outlet of the first cooler 12 and the inlet of the first separation tank 13. In the first separation tank 13, mist is generated. After settling, the mist condenses and is discharged from the drain outlet of the first separation tank 13. The separated N2 gas then enters the second cooler 14 through the outlet of the first separation tank 13. The second cooler 14 continues the second cooling process, using liquid ammonia at 10°C and 1.6 MPa. The cooled N2 gas enters the second separator 15 through the inlet of the second separator 15 from the outlet of the second cooler 14 for further separation. Similarly, mist is generated within the second separator 15. After settling, the mist condenses and is discharged from the drain outlet of the second separator 15. The separated N2 gas is discharged from the outlet of the second separator 15. The N2 gas discharged from the outlet of the second separator 15 has a temperature of 5°C, a pressure of 0.01 MPa, and a solid content ≤1 mg / Nm³. 3 Dew point ≤ -40℃; The gas discharged from the outlet of the second separator 15 enters the inlet of the compressor 4 through a pipeline along with fresh N2 compressed gas. The gas is pressurized to 4 MPa by the compressor 4 to obtain high-pressure gas with qualified pressure and composition.

[0075] The high-pressure N2 gas discharged from the compressor 4 flows through the outlet and into the inlet of the high-pressure tank 5 via a pipeline, so as to be used for intermittent pressurization of the pressure buffer chamber 2.

[0076] In this embodiment 2-3, the system has no external gas discharge. All the circulating gas enters the pressure buffer chamber 2, and almost all solid materials are sent to the receiving chamber 3. Only ppm-level solid materials are discharged through the wastewater system and can be recovered through sedimentation equipment in the future.

[0077] As can be seen from the above, the solid conveying system with gas recovery described in this utility model has a wide range of applications, low cost, and a very high market prospect.

[0078] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any modifications or equivalent changes made based on the technical essence of the present utility model shall still fall within the scope of protection claimed by the present utility model.

Claims

1. A solid conveying system with gas recovery, characterized in that, Based on the direction of gas flow, it includes a material conveying unit (A), a gas recovery unit (B), and a gas cleaning unit (C). The material conveying unit (A), the gas recovery unit (B), and the gas cleaning unit (C) are connected in sequence, and the gas cleaning unit (C) is also connected to the material conveying unit (A). The material conveying unit (A) includes a low-pressure chamber (1), a pressure buffer chamber (2), a receiving chamber (3), a compressor (4), and a high-pressure tank (5); The gas recovery unit (B) includes a gas-solid filter (6), an exhaust valve (7), a gas storage tank (8), and a dust storage tank (9). The gas cleaning unit (C) includes a wet cleaning tank (10), a circulating pump (11), a first cooler (12), a first separation tank (13), a second cooler (14), and a second separation tank (15).

2. The solid conveying system with gas recovery according to claim 1, characterized in that, The low-pressure chamber (1) includes an inlet and an outlet, and the material enters through the inlet of the low-pressure chamber (1).

3. The solid conveying system with gas recovery according to claim 1, characterized in that, The pressure buffer chamber (2) includes an inlet, an outlet, an air inlet, and an exhaust outlet.

4. The solid conveying system with gas recovery according to claim 1, characterized in that, The receiving bin (3) includes an inlet and an outlet.

5. The solid conveying system with gas recovery according to claim 1, characterized in that, The compressor (4) includes an air inlet and an air outlet.

6. The solid conveying system with gas recovery according to claim 1, characterized in that, The high-pressure tank (5) includes an air inlet and an air outlet.

7. The solid conveying system with gas recovery according to claim 1, characterized in that, The gas-solid filter (6) includes an air inlet, an air outlet, and a material outlet.

8. The solid conveying system with gas recovery according to claim 1, characterized in that, The gas storage tank (8) includes an air inlet, an air outlet, and a material outlet.

9. The solid conveying system with gas recovery according to claim 1, characterized in that, The dust storage tank (9) includes an inlet and an outlet.

10. The solid conveying system with gas recovery according to claim 1, characterized in that, The wet washing tank (10) includes an air inlet, an air outlet, a water outlet, and a circulating water outlet.

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