Displacement chamber with pressure control and kiln using same

Abstract

The utility model discloses a displacement chamber with pressure control and a kiln using the same, and belongs to the technical field of kilns, the displacement chamber comprises a first cavity, a second cavity, a third cavity and an air inlet device which are communicated in sequence, the air inlet device is arranged on the second cavity, a first movable door is arranged between the first cavity and the second cavity, and a second movable door is arranged between the second cavity and the third cavity. A first movable door is arranged between the first cavity body and the second cavity body, a second movable door is arranged between the second cavity body and the third cavity body, the first pressure difference transmitter measures the pressure difference between the first cavity body and the second cavity body, the second pressure difference transmitter measures the pressure difference between the second cavity body and the third cavity body, and the second pressure difference transmitter measures the pressure difference between the second cavity body and the third cavity body. The first pressure difference transmitter and the second pressure difference transmitter are used for controlling communication of all the cavities, smoke is prevented from entering the replacement chamber, and the ventilation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of kilns, in particular to a displacement chamber with pressure control and a kiln using the displacement chamber. Background Art

[0002] Before sintering, the kiln needs to exhaust the air inside to prevent the oxygen in the air from reacting with the material at high temperatures, which could lead to sintering failure. Before entering the kiln, the material to be sintered needs to pass through a displacement chamber for gas replacement. Inert gas is injected into the displacement chamber to expel the air brought in with the material. Existing displacement chambers have centralized inlet ports for inert gas, resulting in low air replacement efficiency. Furthermore, the high-temperature gas on the side closest to the kiln easily pushes the flue gas inside, causing some tar to enter the displacement chamber. The displacement chamber needs to be regularly fired to remove the tar. There is a need for a displacement chamber that can improve gas replacement efficiency and prevent kiln flue gas from entering.

[0003] The existing patent application with publication number CN112857033A discloses a roller kiln replacement chamber and ventilation system, the replacement chamber includes at least three sealed doors and an inspection door, the three sealed doors divide the replacement chamber into a gas replacement chamber, a transition chamber and a connecting chamber connected to the roller kiln, the inspection door is arranged in the connecting chamber, the inspection door separates the connecting chamber from the connecting chamber, and a lifting mechanism is arranged above the three sealed doors and the inspection door. During normal operation, the sealed doors are in a normally closed state and the inspection doors are in a normally open state. When the replacement chamber is being repaired, the inspection door is in a closed state; the ventilation system is arranged in the above-mentioned roller kiln replacement chamber, including a vacuum pump, an air inlet pipe, an exhaust pipe, multiple gas pipes and solenoid valves arranged on the gas pipes. The air intake efficiency of the roller kiln replacement chamber and the ventilation system is low and the flue gas in the kiln can easily enter the replacement chamber. Utility Model Content

[0004] One of the purposes of the utility model is to provide a displacement chamber with pressure control, which solves the problems of low ventilation efficiency of the existing displacement chamber and easy entry of kiln smoke into the displacement chamber.

[0005] In order to achieve the above-mentioned purpose of the utility model, the technical solution adopted by the utility model is as follows:

[0006] A displacement chamber with pressure control includes a first cavity, a second cavity, a third cavity and an air intake device which are connected in sequence, the air intake device is arranged on the second cavity, a first movable door is provided between the first cavity and the second cavity, and a second movable door is provided between the second cavity and the third cavity. The chamber also includes a first differential pressure transmitter and a second differential pressure transmitter, the first differential pressure transmitter measures the pressure difference between the first cavity and the second cavity, and the second differential pressure transmitter measures the pressure difference between the second cavity and the third cavity. The first differential pressure transmitter and the second differential pressure transmitter are used to control the communication between the cavities to prevent smoke from entering the displacement chamber and improve the ventilation efficiency.

[0007] Furthermore, a first pressure sensor is provided in the first cavity, a second pressure sensor is provided in the second cavity, and a third pressure sensor is provided in the third cavity, for monitoring pressure changes in each cavity.

[0008] Furthermore, it also includes an oxygen concentration analyzer, which is arranged in the second cavity to ensure the completeness of ventilation.

[0009] Preferably, an exhaust pipe is provided in the second cavity, and the exhaust pipe is arranged at the top of the second cavity for quickly exhausting air.

[0010] Preferably, the air intake device includes an air intake pipe, multiple air outlet pipes and a main pipe, one end of the air intake pipe is connected to the main pipe, and the other end is connected to the gas source, one end of the multiple air outlet pipes are respectively connected to the main pipe, and the other end of the multiple air outlet pipes are connected to the second cavity, for quickly and evenly filling the second cavity with gas.

[0011] More preferably, the air inlet device is arranged at the bottom of the second cavity to facilitate the entry of inert gas.

[0012] More preferably, the air intake device further includes a valve, which is arranged on the air intake pipe and is used to control the filling flow of the gas.

[0013] As a better option, both the first differential pressure transmitter and the second differential pressure transmitter are provided with a pressure-slowing tube to prevent the first differential pressure transmitter and the second differential pressure transmitter from being disturbed by pressure changes, thereby improving the accuracy of controlling the opening of the movable door.

[0014] More preferably, the first movable door includes a lifting mechanism, which drives the first movable door to move perpendicular to the conveying direction. The first movable door and the second movable door have the same structure and are used to drive the movable opening and closing.

[0015] The second purpose of the utility model is to provide a kiln, which solves the problem that the smoke in the existing kiln is easily leaked from the replacement chambers at both ends.

[0016] In order to achieve the above-mentioned purpose of the utility model, the technical solution adopted by the utility model is as follows:

[0017] A kiln comprises the displacement chamber with pressure control, wherein the displacement chamber with pressure control is used for the entry and exit of materials at the inlet and outlet of the kiln.

[0018] The beneficial effects of the utility model are:

[0019] (1) The displacement chamber with pressure control includes three cavities connected in sequence, each cavity is provided with a pressure sensing element, and the sealing of the cavity is controlled by a movable door between the cavities. A pressure differential transmitter is provided between two adjacent cavities to judge the pressure difference as a condition for opening the movable door. When the material enters the cavity for gas displacement, the movable door will open only when the pressure of the middle cavity is greater than the pressure of the cavities on both sides, so that the gas outside or in the kiln cannot enter the displacement chamber.

[0020] (2) An oxygen concentration analyzer and an air intake device are provided in the middle cavity of the displacement chamber with pressure control. The oxygen concentration analyzer is used to measure the oxygen concentration in the middle cavity to determine whether the displacement reaction is completed. The air intake device is used to fill the middle cavity with inert gas. The air intake device is provided with multiple air outlet pipes, and the air outlet pipes are filled with gas from the bottom of the middle cavity, so that the flow rate of the discharged air is high and uniform, thereby preventing local air residue from affecting the sintering molding of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A front view of a displacement chamber with pressure control provided by the present invention;

[0022] Figure 2 A side view of a displacement chamber with pressure control provided by the present invention;

[0023] Figure 3 This is a simplified structural diagram of the displacement chamber with pressure control provided in Example 2.

[0024] Reference numerals:

[0025] 1. Housing; 11. Valve; 12. Exhaust pipe; 13. First cavity; 131. First pressure sensor; 14. Second cavity; 141. Second pressure sensor; 15. Third cavity; 151. Third pressure sensor; 16. Oxygen concentration analyzer; 17. First differential pressure transmitter; 18. Second differential pressure transmitter; 19. Pressure relief pipe; 2. Air intake device; 21. Air intake pipe; 22. Air outlet pipe; 23. Main pipe; 3. First movable door; 31. Lifting mechanism; 4. Second movable door. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Example 1

[0028] like Figure 1-Figure 2 As shown, this embodiment discloses a displacement chamber with pressure control, including a first cavity 13, a second cavity 14, a third cavity 15 and an air intake device 2 which are connected in sequence. The air intake device 2 is arranged on the second cavity 14. A first movable door 3 is provided between the first cavity 13 and the second cavity 14, and a second movable door 4 is provided between the second cavity 14 and the third cavity 15. The first movable door 3 and the second movable door 4 separate the first cavity 13, the second cavity 14 and the third cavity 15, so that a closed space is formed in the second cavity 14, and the material completes gas replacement in the second cavity 14. The displacement chamber with pressure control also includes The first differential pressure transmitter 17 and the second differential pressure transmitter 18, the first differential pressure transmitter 17 measures the pressure difference between the first cavity 13 and the second cavity 14, the second differential pressure transmitter 18 measures the pressure difference between the second cavity 14 and the third cavity 15. When the material enters from the first cavity 13 into the second cavity 14, when the pressure in the second cavity 14 is greater than that in the first cavity 13, the first movable door 3 opens. When the material enters from the second cavity 14 into the third cavity 15, when the pressure in the second cavity 14 is greater than that in the third cavity 15 and the oxygen concentration in the cavity reaches the set value, it opens to prevent external air and flue gas tar from entering the replacement chamber.

[0029] Furthermore, a first pressure sensor 131 is provided in the first cavity 13, a second pressure sensor 141 is provided in the second cavity 14, and a third pressure sensor 151 is provided in the third cavity 15, for respectively monitoring the pressure values ​​in each cavity.

[0030] Furthermore, an oxygen concentration analyzer 16 is included. The oxygen concentration analyzer 16 is arranged in the second cavity 14 and is used to monitor the air replacement situation in the second cavity 14 in real time to ensure that the oxygen in the second cavity 14 can be completely discharged.

[0031] Preferably, an exhaust pipe 12 is provided in the second cavity 14, and the exhaust pipe 12 is arranged at the top of the second cavity 14. Multiple exhaust pipes 12 are provided at the top of the second cavity 14. The multiple exhaust pipes 12 are evenly distributed and are used to discharge the air in the second cavity 14 in time, prevent residual air in the second cavity 14, and improve the efficiency of exhausting gas.

[0032] Furthermore, the air intake device 2 includes an air intake pipe 21, multiple air outlet pipes 22 and a main pipe 23. One end of the air intake pipe 21 is connected to the main pipe 23, and the other end is connected to the gas source. The gas source provides nitrogen for replacing the air in the second cavity 14. One end of the multiple air outlet pipes 22 is respectively connected to the main pipe 23, and the other end of the multiple air outlet pipes 22 is connected to the second cavity 14, which is used to quickly and evenly introduce gas into the second cavity 14.

[0033] Preferably, the air intake device 2 is disposed at the bottom of the second cavity 14 so that nitrogen can quickly enter the second cavity 14 .

[0034] More preferably, the air intake device 2 further includes a valve 11 , which is provided on the air intake pipe 21 , and is used to control the flow rate of the inert gas entering the second cavity 14 .

[0035] More preferably, the first movable door 3 includes a lifting mechanism 31, which drives the first movable door 3 to move perpendicular to the conveying direction. The first movable door 3 and the second movable door 4 have the same structure. The lifting mechanism 31 is telescopically connected to the outer wall of the shell 1, and the shell 1 accommodates a cavity for separately controlling the opening and closing of the first movable door 3 and the second movable door 4.

[0036] The working process of the displacement chamber with pressure control is as follows:

[0037] The material is transported to the first cavity 13 by the conveying device, and the pressure sensor connected to the first differential pressure transmitter 17 detects the pressure difference between the first cavity 13 and the second cavity 14. If the pressure in the second cavity 14 is greater than that in the first cavity 13, the first movable door 3 is opened, and the material is transported to the second cavity 14. If the pressure in the second cavity 14 is greater than that in the first cavity 13, the air intake device 2 is used to fill the second cavity 14 with gas until the pressure in the second cavity 14 is greater than that in the first cavity 13. After the material enters the second cavity 14, the first movable door 3 and the second movable door 4 are closed to seal the second cavity 14. Then the air intake device 2 is opened. Inert gas is filled into the second cavity 14, and the air in the second cavity 14 is discharged through the exhaust pipe 12. The oxygen concentration analyzer 16 stops charging after detecting that the oxygen concentration is lower than the set value. The pressure sensor connected to the second differential pressure transmitter 18 detects the pressure difference between the second cavity 14 and the third cavity 15. If the pressure in the second cavity 14 is greater than that in the third cavity 15, the second movable door 4 opens, and the material enters the kiln through the third cavity 15. If the pressure in the second cavity 14 is lower than that in the third cavity 15, the air intake device 2 charges the second cavity 14 with gas again until the pressure in the second cavity 14 is greater than that in the third cavity 15.

[0038] Example 2

[0039] like Figure 3 As shown, this embodiment also discloses a displacement chamber with pressure control, in which a pressure-slowing tube 19 and a pressure gauge are provided on the first differential pressure transmitter 17 and the second differential pressure transmitter 18. The pressure-slowing tube 19 is used to prevent gas disturbances in the cavity from interfering with the differential pressure transmitter, thereby improving the accuracy of controlling the movable door. The pressure gauge is used for external personnel to view pressure changes in real time.

[0040] Example 3

[0041] This embodiment also discloses a kiln, including a displacement chamber with pressure control, which is installed at both ends of the kiln inlet and outlet for ventilating the material and preventing air from entering the kiln.

[0042] Based on the disclosure and teachings of the above description, those skilled in the art may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and any modifications and variations of the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although certain specific terms are used in this description, these terms are for convenience of description only and do not constitute any limitation to the present invention.

Claims

1. A displacement chamber with pressure control, comprising a first cavity (13), a second cavity (14), a third cavity (15) and an air intake device (2) which are sequentially connected, wherein the air intake device (2) is arranged on the second cavity (14), a first movable door (3) is provided between the first cavity (13) and the second cavity (14), and a second movable door (4) is provided between the second cavity (14) and the third cavity (15), characterized in that: The invention also includes a first differential pressure transmitter (17) and a second differential pressure transmitter (18), wherein the first differential pressure transmitter (17) measures the pressure difference between the first cavity (13) and the second cavity (14), and the second differential pressure transmitter (18) measures the pressure difference between the second cavity (14) and the third cavity (15).

2. The displacement chamber with pressure control according to claim 1, characterized in that: A first pressure sensor (131) is provided in the first cavity (13), a second pressure sensor (141) is provided in the second cavity (14), and a third pressure sensor (151) is provided in the third cavity (15).

3. The displacement chamber with pressure control according to claim 2, characterized in that: It also includes an oxygen concentration analyzer (16), which is arranged in the second cavity (14).

4. The displacement chamber with pressure control according to claim 3, characterized in that: An exhaust pipe (12) is provided in the second cavity (14), and the exhaust pipe (12) is arranged at the top of the second cavity (14).

5. The displacement chamber with pressure control according to any one of claims 1 to 4, characterized in that: The air intake device (2) comprises an air intake pipe (21), a plurality of air outlet pipes (22) and a main pipe (23); one end of the air intake pipe (21) is connected to the main pipe (23), and the other end is connected to an air source; one end of the plurality of air outlet pipes (22) is respectively connected to the main pipe (23), and the other end of the plurality of air outlet pipes (22) is connected to the second cavity (14).

6. The displacement chamber with pressure control according to claim 5, characterized in that: The air intake device (2) is arranged at the bottom of the second cavity (14).

7. The displacement chamber with pressure control according to claim 6, characterized in that: The air intake device (2) further comprises a valve (11), and the valve (11) is arranged on the air intake pipe (21).

8. The displacement chamber with pressure control according to claim 1, characterized in that: The first differential pressure transmitter (17) and the second differential pressure transmitter (18) are both provided with a pressure-slowing tube (19).

9. The displacement chamber with pressure control according to claim 8, characterized in that: The first movable door (3) comprises a lifting mechanism (31), and the lifting mechanism (31) drives the first movable door (3) to move perpendicularly to the conveying direction. The first movable door (3) and the second movable door (4) have the same structure.

10. A kiln, characterized in that: The invention comprises the replacement chamber with pressure control according to any one of claims 1 to 9.

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