Concentrated phase and dilute phase switchable pneumatic conveying device

Abstract

The utility model relates to the technical field of metallurgical industry equipment, and discloses a dense phase and dilute phase switchable pneumatic conveying device which comprises an ash discharging device, a nitrogen source device and a conveying device which are connected with one another. A nitrogen tank of the nitrogen source device is connected with a conveying pump of the ash discharging device through a nitrogen fluidization pressurization pressure reducing valve set, a nitrogen flow pressure electric adjusting valve set of the nitrogen source device is connected with a discharging three-way connecting pipe, and the discharging three-way connecting pipe is connected with an external ash storage bin. Adjustment between a concentrated phase and a dilute phase can be achieved through the valve, under the condition that additional equipment does not need to be added, only the control sequence of the valve needs to be changed, and switching between concentrated phase conveying and dilute phase continuous conveying can be achieved through conveying flow pressure so as to adapt to different working conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgical industry equipment, in particular to a dense phase and a dilute phase switchable pneumatic conveying device. Background Art

[0002] The dust conveying methods of blast furnace gas bag filter include conventional mechanical conveying process and pneumatic conveying process. Pneumatic conveying process is divided into dense phase pneumatic conveying and dilute phase pneumatic conveying. The difference between the two lies in the size of the solid-gas ratio: dense phase pneumatic conveying has a large solid-gas ratio, which belongs to static pressure conveying, the pipeline flow rate is relatively low, and the material is dense in the pipeline. The advantages are low gas consumption and less pipeline wear; the disadvantages are intermittent conveying, low conveying efficiency, and frequent valve switching. Dilute phase pneumatic conveying has a small solid-gas ratio, which belongs to dynamic pressure conveying, the pipeline flow rate is relatively high, and the material is in a flying state in the pipeline. The advantages are continuous conveying, high conveying efficiency, and low valve switching frequency; the disadvantages are high gas consumption and greater pipeline wear.

[0003] In the document CN201920636514, a blast furnace gas full dry purification system is disclosed, including a blast furnace, a blast furnace rough gas purification system connected to the blast furnace, the blast furnace rough gas purification system is connected to a bag filter via a rough gas pipeline, the bag filter is connected to a parallel TRT system and a pressure reducing valve group with a muffler via a clean gas outlet main pipe, and then connected to a clean gas pipeline network, and an outlet clean gas branch pipe blind plate valve is provided at the clean gas outlet of each bag filter, and the outlet clean gas branch pipe blind plate valve is provided with an outlet branch pipe and a gas pressure relief branch pipe in parallel, and a pressure relief gas branch pipe butterfly valve is provided on the gas pressure relief branch pipe, and an outlet clean gas branch pipe butterfly valve is provided on the gas outlet branch pipe, and the gas pressure relief branch pipe is summarized with a gas pressure relief main pipe, and the gas pressure relief main pipe is connected to the clean gas pipeline network. This purification method has only one dense phase, which cannot adapt to a variety of situations, and requires additional equipment for purification, so the cost is relatively high.

[0004] Therefore, a new technical solution is needed to solve the above technical problems. Summary of the invention

[0005] In order to solve the above problems, the utility model discloses a dense phase and dilute phase switchable pneumatic conveying device, which can switch between dense phase conveying and dilute phase continuous conveying by only changing the valve control sequence and conveying flow pressure without adding equipment, so as to adapt to different working conditions.

[0006] The technical solution of the utility model is: a dense phase and dilute phase switchable pneumatic conveying device, comprising an ash unloading device, a nitrogen gas source device and a conveying device connected to each other, the ash unloading device comprising a plurality of blast furnace gas dust collector ash hoppers, a nitrogen tank of the nitrogen gas source device connected to a conveying pump of the ash unloading device through a nitrogen fluidization pressurization and pressure reducing valve group, a nitrogen flow pressure electric regulating valve group of the nitrogen gas source device connected to a discharge three-way pipe, and a discharge three-way pipe connected to an external ash storage bin.

[0007] Preferably, the delivery pump is located at the bottom of the blast furnace gas dust collector ash hopper of the ash unloading device, and the blast furnace gas dust collector ash hopper is provided with pressurized gas. A manual inspection ball valve and a compensator are provided in sequence from top to bottom between the delivery pump and the blast furnace gas dust collector ash hopper.

[0008] By adopting the above technical solution, the device can be inspected and repaired by manually inspecting the ball valve, which is convenient for maintaining the smooth operation of the device.

[0009] Preferably, a gas delivery gas source nitrogen pipeline is provided at the output end of the nitrogen flow pressure electric regulating valve group, and a pneumatic regulating valve a and a pneumatic regulating valve b are provided on the gas delivery gas source nitrogen pipeline. A plurality of discharge three-way pipes are provided between the pneumatic regulating valve a and the pneumatic regulating valve b, and the discharge three-way pipes are connected by an ash conveying pipeline, and the pneumatic regulating valve b is close to the outside and connected to the ash storage bin.

[0010] By adopting the above technical solution, the pneumatic control valve a and the pneumatic control valve b on the ash conveying pipeline are opened, and then the nitrogen flow pressure electric regulating valve is opened to adjust the nitrogen delivery pressure and flow rate. The dust in the conveying pump enters the ash conveying pipeline through the pneumatic discharge valve and the discharge three-way pipe, and the dust is transported to the ash storage bin through the ash conveying pipeline.

[0011] Preferably, a pneumatic feed valve is provided between the top of the delivery pump and the compensator, a pneumatic discharge valve is provided on the lower side, and the pneumatic discharge valve is connected to the discharge three-way pipe.

[0012] By adopting the above technical solution, the manual inspection ball valve and the pneumatic feed valve above the delivery pump are opened, and the dust in the ash hopper of the blast furnace gas dust collector enters the delivery pump.

[0013] Preferably, the nitrogen fluidization pressurization and pressure reducing valve group is connected to a fluidization pressurization nitrogen pipeline, and the bottom of the delivery pump is connected to the fluidization pressurization nitrogen pipeline through a pneumatic vulcanization pressurization valve.

[0014] By adopting the above technical solution, the pneumatic pressurized fluidizing valve on the conveying pump is opened, and when the pressure detection on the conveying pump reaches the set pressure, the pneumatic discharge valve is opened.

[0015] Preferably, the nitrogen tank is connected to an external nitrogen gas source, the pressure of the external nitrogen gas source is greater than 0.6 MPa, and the nitrogen tank is connected to the nitrogen fluidization pressurization and pressure reducing valve group and the nitrogen flow pressure electric regulating valve group through a nitrogen pipeline.

[0016] By adopting the above technical solution, the nitrogen flow pressure electric regulating valve is used to adjust the nitrogen delivery pressure and flow rate. The dust in the delivery pump enters the ash conveying pipeline through the pneumatic discharge valve and the discharge three-way pipe, and the dust is transported to the ash storage bin through the ash conveying pipeline.

[0017] Preferably, the fluidized pressurized nitrogen pipeline, the gas delivery source nitrogen pipeline and the delivery pump are all provided with pressure detectors.

[0018] By adopting the above technical solution, the pressure value inside the corresponding pipeline pump body is detected by a pressure detector, and adjustment is performed accordingly.

[0019] The benefits of the utility model are as follows: 1. The utility model can achieve regulation between dense phase and dilute phase through valves. Without adding other equipment, only the control sequence of the valves needs to be changed to achieve the switching of dense phase conveying and dilute phase continuous conveying by conveying flow pressure, so as to adapt to different working conditions.

[0020] 2. The utility model uses a pressure detector to constantly monitor changes in the pressure in the pipeline and the delivery pump, making it convenient for staff to grasp the pressure conditions in a timely manner and to adjust the entire device.

[0021] 3. The utility model only needs one device to adapt to both dense phase and dilute phase conditions, effectively reducing purification costs, reducing the factory's floor space, and the entire production cost, and increasing corporate profits. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the ash unloading device of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the nitrogen gas source device of the utility model;

[0025] Figure 4 It is a structural schematic diagram of the conveying device of the utility model.

[0026] Among them: 1. Blast furnace gas dust collector ash hopper, 2. Manual maintenance ball valve, 3. Compensator, 4. Pneumatic feed valve, 5. Conveying pump, 6. Pneumatic pressurized fluidizing valve, 7. Pneumatic discharge valve, 8. Discharge three-way pipe, 9. Pressure detector, 10. Nitrogen tank, 11. Nitrogen fluidization pressurization and pressure reducing valve group, 12. Nitrogen flow pressure electric regulating valve group, 13. Fluidization pressurized nitrogen pipeline, 14. Pneumatic conveying gas source nitrogen pipeline, 15. Pneumatic control valve a, 16. Ash conveying pipeline, 17. Pneumatic control valve b, 18. Ash storage bin, 19. Pressurized coal gas, 6. Pneumatic vulcanization pressurization valve, 20. Nitrogen pipeline. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0028] like Figure 1-4 As shown, a dense phase and dilute phase switchable pneumatic conveying device includes an ash unloading device, a nitrogen gas source device and a conveying device that are interconnected. The ash unloading device includes a plurality of blast furnace gas dust collector ash hoppers 1, a nitrogen tank 10 of the nitrogen gas source device is connected to the morning conveying pump 5 of the ash unloading device through a nitrogen fluidization pressurization and pressure reducing valve group 11, a nitrogen flow pressure electric regulating valve group 12 of the nitrogen gas source device is connected to a discharge three-way pipe 8, and the discharge three-way pipe 8 is connected to an external ash storage bin 18.

[0029] The delivery pump is located at the bottom of the blast furnace gas dust collector ash hopper 1 of the ash unloading device. The blast furnace gas dust collector ash hopper 1 is provided with pressurized gas 19. A manual inspection ball valve 2 and a compensator 3 are provided in sequence from top to bottom between the delivery pump 5 and the blast furnace gas dust collector ash hopper 1. The manual inspection ball valve 2 can inspect the device, which is convenient for maintaining the smooth operation of the device.

[0030] A gas delivery gas source nitrogen pipeline 14 is provided at the output end of the nitrogen flow pressure electric regulating valve group 12, and a pneumatic regulating valve a15 and a pneumatic regulating valve b17 are provided on the gas delivery gas source nitrogen pipeline 14. A plurality of discharge three-way pipes 8 are provided between the pneumatic regulating valve a15 and the pneumatic regulating valve b17, and the discharge three-way pipes 8 are connected by an ash conveying pipeline 16. The pneumatic regulating valve b17 is close to the outside and connected to the ash storage bin 18. The pneumatic control valve a15 and the pneumatic control valve b17 on the ash conveying pipeline 16 are opened, and then the nitrogen flow pressure electric regulating valve is opened to adjust the nitrogen delivery pressure and flow rate. The dust in the conveying pump 5 enters the ash conveying pipeline 16 through the pneumatic discharge valve 7 and the discharge three-way pipe 8, and the dust is conveyed to the ash storage bin 18 through the ash conveying pipeline 16.

[0031] A pneumatic feed valve 4 is provided between the top of the delivery pump 5 and the compensator 3, and a pneumatic discharge valve 7 is provided on the lower side. The pneumatic discharge valve 7 is connected to the discharge three-way pipe 8. The manual inspection ball valve 2 and the pneumatic feed valve 4 above the delivery pump 5 are opened, and the dust in the ash hopper 1 of the blast furnace gas dust collector enters the delivery pump 5.

[0032] The nitrogen fluidization pressurization and pressure reducing valve group 11 is connected to a fluidization pressurized nitrogen pipeline 13. The bottom of the delivery pump 5 is connected to the fluidization pressurized nitrogen pipeline 13 through a pneumatic vulcanization pressurization valve 6. The pneumatic pressurized fluidization valve 6 on the delivery pump 5 is opened. When the pressure detection on the delivery pump 5 reaches the set pressure, the pneumatic discharge valve 7 is opened.

[0033] The nitrogen tank 10 is connected to an external nitrogen gas source, and the pressure of the external nitrogen gas source is greater than 0.6MPa. The nitrogen tank 10 is connected to the nitrogen fluidization pressurization and pressure reducing valve group 11 and the nitrogen flow pressure electric regulating valve group 12 through the nitrogen pipeline 20. The nitrogen flow pressure electric regulating valve adjusts the nitrogen delivery pressure and flow. The dust in the delivery pump enters the ash delivery pipeline 16 through the pneumatic discharge valve and the discharge three-way pipe 8, and the dust is transported to the ash storage bin 18 through the ash delivery pipeline 16.

[0034] The fluidized pressurized nitrogen pipeline 13, the gas delivery source nitrogen pipeline 14 and the delivery pump 5 are all provided with a pressure detector 9, and the pressure value inside the corresponding pipeline pump body is detected by the pressure detector 9, so as to make adjustments.

[0035] The nitrogen fluidization pressurization and pressure reducing valve group 11 is provided with two valves in parallel, one of which is one valve and the other is three valves. The two valves are connected in parallel, and the two ends are connected to the nitrogen pipeline 20 and the fluidization pressurization nitrogen pipe 13 respectively.

[0036] The nitrogen flow pressure electric regulating valve group 12 is provided with two valves in parallel, one of which is one valve and the other is three valves. The middle valve is a pressure flow electric regulating valve. The two valves are connected in parallel, and the two ends are respectively connected to the nitrogen pipeline 20 and the fluidized pressurized nitrogen pipe 13.

[0037] Working principle: dense phase conveying (when the dust temperature in the dust collector hopper is low, there is agglomeration and hardening, and the fluidity is poor, dense phase conveying is used)

[0038] Step 1: During the ash unloading stage, the manual inspection ball valve 2 and the pneumatic feed valve 4 above the delivery pump 5 are opened, and the dust in the ash hopper 1 of the blast furnace gas dust collector enters the delivery pump 5. The ash unloading amount entering the delivery pump 5 is controlled. When the unloading reaches the setting, the pneumatic feed valve 4 is closed;

[0039] Step 2: During the pressurized fluidization stage, the pneumatic pressurized fluidization valve 6 on the delivery pump 5 is opened. When the pressure detection on the delivery pump 5 reaches the set pressure, the pneumatic discharge valve 7 is opened;

[0040] Step 3: During the conveying stage, the pneumatic control valve a15 and the pneumatic control valve b17 on the ash conveying pipeline 16 are opened, and then the nitrogen flow pressure electric regulating valve is opened to adjust the nitrogen conveying pressure and flow rate; the dust in the conveying pump 5 enters the ash conveying pipeline 16 through the pneumatic discharge valve 7 and the discharge three-way pipe 8, and the dust is transported to the ash storage bin 18 through the ash conveying pipeline 16;

[0041] Step 4: End. When the pressure of the ash conveying pipeline 16 drops to the set value, it means that the dust in the ash conveying pipeline 16 has been transported. After a delay of a few seconds, the pneumatic discharge valve 7 of the conveying pump 5 and the pneumatic control valve a15 are closed to complete one conveying. Then, the conveying is cyclically carried out according to the above steps (1) to (4). After the dust in one ash hopper is transported, the dust in the ash hoppers of other dust collectors is transported.

[0042] Dilute phase conveying (when the dust temperature in the dust collector hopper is high and the dust fluidity is good, dilute phase conveying is used, and dilute phase conveying is continuous conveying):

[0043] Step 1: First, open the pneumatic control valve a15 and the pneumatic control valve b17 on the ash conveying pipeline 16, and then open the nitrogen flow pressure electric regulating valve to adjust the nitrogen delivery pressure and flow;

[0044] Step 2: Open the pneumatic pressurized fluidizing valve 6 on the delivery pump 5, then open the pneumatic feed valve 4 and the manual inspection ball valve 2 on the top of the delivery pump 5, and the dust in the ash hopper 1 of the blast furnace gas dust collector enters the delivery pump 5;

[0045] Step 3: After the dust is fluidized in the conveying pump 5, it enters the ash conveying pipeline 16 through the discharge tee pipe 8. The dust fluidization and conveying are carried out simultaneously until the dust in the blast furnace gas dust collector ash hopper 1 is conveyed. Then, the pneumatic discharge valve 7, the pneumatic pressurized fluidizing valve 6, and the pneumatic control valve a15 on the ash conveying pipeline 16 are closed in sequence to complete the dust conveying in the blast furnace gas dust collector ash hopper 1. Then, according to the above steps (1) to (3), the dust in the other blast furnace gas dust collector ash hoppers 1 is conveyed and the conveying is ended.

[0046] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention, and the purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the implementation methods of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A dense phase and dilute phase switchable pneumatic conveying device, comprising an ash unloading device, a nitrogen gas source device and a conveying device connected to each other, wherein the ash unloading device comprises a plurality of blast furnace gas dust collector ash hoppers, characterized in that: The nitrogen tank of the nitrogen source device is connected to the morning delivery pump of the ash unloading device through a nitrogen fluidization pressurization and pressure reducing valve group, the nitrogen flow pressure electric regulating valve group of the nitrogen source device is connected to the discharge three-way pipe, and the discharge three-way pipe is connected to an external ash storage bin.

2. A dense phase and dilute phase switchable pneumatic conveying device according to claim 1, characterized in that: The delivery pump is located at the bottom of the blast furnace gas dust collector ash hopper of the ash unloading device. The blast furnace gas dust collector ash hopper is provided with pressurized gas. A manual inspection ball valve and a compensator are sequentially provided between the delivery pump and the blast furnace gas dust collector ash hopper from top to bottom.

3. A dense phase and dilute phase switchable pneumatic conveying device according to claim 2, characterized in that: A gas delivery gas source nitrogen pipeline is provided at the output end of the nitrogen flow pressure electric regulating valve group, and a pneumatic regulating valve a and a pneumatic regulating valve b are provided on the gas delivery gas source nitrogen pipeline. A plurality of discharge three-way pipes are provided between the pneumatic regulating valve a and the pneumatic regulating valve b, and the discharge three-way pipes are connected by an ash conveying pipeline, and the pneumatic regulating valve b is close to the outside and connected to the ash storage bin.

4. A dense phase and dilute phase switchable pneumatic conveying device according to claim 3, characterized in that: A pneumatic feed valve is arranged between the top of the delivery pump and the compensator, and a pneumatic discharge valve is arranged on the lower side, and the pneumatic discharge valve is connected to the discharge three-way pipe.

5. A dense phase and dilute phase switchable pneumatic conveying device according to claim 3, characterized in that: The nitrogen fluidization pressurization and pressure reducing valve group is connected with a fluidization pressurization nitrogen pipeline, and the bottom of the delivery pump is connected with the fluidization pressurization nitrogen pipeline through a pneumatic vulcanization pressurization valve.

6. A dense phase and dilute phase switchable pneumatic conveying device according to claim 1, characterized in that: The nitrogen tank is connected to an external nitrogen gas source, the pressure of the external nitrogen gas source is greater than 0.6MPa, and the nitrogen tank is connected to a nitrogen fluidization pressurization and pressure reducing valve group and a nitrogen flow pressure electric regulating valve group through a nitrogen pipeline.

7. A dense phase and dilute phase switchable pneumatic conveying device according to claim 5, characterized in that: The fluidized pressurized nitrogen pipeline, the gas delivery source nitrogen pipeline and the delivery pump are all provided with pressure detectors.

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