Pure terephthalic acid (PTA) main device air compressor stable operation method

Abstract

The invention discloses a stable operation method for an air compressor of a PTA (pure terephthalic acid) main device, which belongs to the technical field of chemical production equipment and comprises an air filter for filtering air and a cooling water heat exchanger for cooling and dehumidifying the filtered air. The cooling water heat exchanger is used for cooling air and then providing cooled air for the multi-stage compressor system, the multi-stage compressor system is driven by a steam turbine of a steam turbine, the multi-stage refrigerating machine system is matched with the multi-stage compressor system, and the multi-stage refrigerating machine system is used for carrying out heat extraction and heat exchange on compressed air of the multi-stage compressor system. A heated medium is used as a heat source, so that the multi-stage refrigerator system performs refrigeration cycle, the multi-stage compressor system is used for conveying low-temperature compressed air to the oxidation reactor, the technical problem of high compressor energy consumption caused by air temperature and humidity is solved, and the system is mainly applied to the aspect of hydrogenation reactor air supply.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical production equipment, and in particular relates to a method for stabilizing the operation of an air compressor of a PTA main device. Background Art

[0002] The air compressor is a key equipment in the oxidation section of the PTA unit. Its function is to provide process air for the oxidation reactor of the PTA unit. Once the compressor unit is shut down or reduced in load, the entire PTA unit will be shut down or reduced in load, resulting in huge losses. Especially in summer every year, as the ambient temperature rises and the air density decreases, the PTA unit will operate at a reduced load. Therefore, it is very necessary to improve the stable operation of the air compressor unit. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a method for stable operation of the air compressor of a PTA main device to solve the technical problem of high energy consumption of the compressor caused by air temperature and humidity.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions: A method for stable operation of an air compressor of a PTA main device, characterized in that it includes an air filter for filtering air, and a cooling water heat exchanger for cooling and dehumidifying the filtered air;

[0005] The cooling water heat exchanger cools the air and provides the cooled air to the multi-stage compressor system. The multi-stage compressor system is driven by a steam turbine. The multi-stage refrigerator system cooperates with the multi-stage compressor system. The multi-stage refrigerator system extracts heat from the compressed air of the multi-stage compressor system and uses the heated medium as a heat source to make the multi-stage refrigerator system refrigerate.

[0006] A multi-stage compressor system is used to deliver cryogenic compressed air to the oxidation reactor.

[0007] Furthermore: the multi-stage refrigeration system includes a primary heat exchanger, a secondary heat exchanger and a tertiary heat exchanger for driving the refrigeration machine, and the primary heat exchanger, the secondary heat exchanger and the tertiary heat exchanger are used to cool the compressed steam of the multi-stage compressor.

[0008] Further: the multi-stage compressor system includes a primary air compressor, a secondary air compressor, a tertiary air compressor and a quaternary air compressor, the cooling water heat exchanger delivers dehumidified air to the primary air compressor, the primary air compressor outlet is connected to the primary heating heat exchanger inlet, the primary heating heat exchanger outlet is connected to the first cooler, and the first cooler is connected to the secondary air compressor inlet;

[0009] The outlet end of the secondary air compressor is connected to the inlet end of the secondary heating heat exchanger, the outlet end of the secondary heating heat exchanger is connected to the second cooler, the second cooler is connected to the inlet end of the tertiary air compressor, the outlet end of the tertiary air compressor is connected to the inlet end of the tertiary heat exchanger, the outlet end of the tertiary heat exchanger is connected to the third cooler, the third cooler is connected to the inlet end of the fourth air compressor, and the outlet end of the fourth air compressor provides compressed air to the oxidation reactor.

[0010] Furthermore: the cooling water of the cooling water heat exchanger provides circulating low-temperature cooling water through the refrigeration system.

[0011] Further: the air filter comprises an outer filter cartridge, an inner filter cartridge and a fixed box, the side wall of the fixed box is provided with a rotating ring, one end of the inner filter cartridge is fixedly connected to the rotating ring, the outer filter cartridge is sleeved on the outside of the inner filter cartridge, one end of the outer filter cartridge is fixedly connected to the fixed box, and the other end has an end cap, the other end of the inner filter cartridge is rotatably mounted on the end cap and communicated with the exhaust port;

[0012] A ring is fixedly installed in the middle of the end cover, a first pull rod is extended inwardly from the ring, the first pull rod is connected to the first fixing rod, the first fixing rod is inserted into the inner filter cartridge, a plurality of second pull rods are extended from the inner filter cartridge to connect the arc plate, and the arc plate is fitted with the inner filter cartridge;

[0013] A first rotating rod fixedly connected to the rotating ring is arranged in the fixed box, a rotating member is sleeved on the first rotating rod, and the rotating member has an arc-shaped transition groove and a U-shaped sliding groove.

[0014] Furthermore: there are two arc-shaped plates, and each arc-shaped plate covers a quarter of the inner filter cartridge.

[0015] Further: a first driving member and a second driving member for driving the rotating member to swing, wherein the first driving member and the second driving member have the same structure;

[0016] The first driving member includes a screw driven by a motor, and the screw is provided with a threaded sleeve, the threaded sleeve is inserted between the inner filter cartridge and the outer filter cartridge and is rotatably connected to the end cover through a bearing, a dust suction pipe fixedly connected to the threaded sleeve, the dust suction pipe is used to connect to an external negative pressure suction device, a linear slide groove is provided on the inner wall of the outer filter cartridge, the dust suction pipe is inserted into the linear slide groove, and the other end of the dust suction pipe is connected to an arc-shaped siphon port, and a second arc plate and a third pull rod are fixedly connected to the screw located in the fixed box, and the end of the third pull rod has a protrusion, which drives the second arc plate to cooperate with the arc transition groove during the rotation of the screw, and at the same time, the protrusion is inserted into the U-shaped slide groove to drive the rotating member to rotate.

[0017] Furthermore: the first fixed pipe is connected to an external blowing device, so that the gas flows inside the first fixed pipe, the second pull rod and the arc plate, and an exhaust hole is opened on the arc plate to blow air into the inner filter cartridge to remove dust. The exhaust hole and the hole of the inner filter cartridge are staggered.

[0018] Compared with the prior art, the present invention has the following advantages: 1. The filtered air is heat exchanged by a cooling water heat exchanger, thereby reducing the temperature and humidity of the air entering the compressor, reducing pipeline corrosion and water droplet impact on the compressor impeller, and reducing the phenomenon of the unit jumping due to excessive vibration value of the air compressor. At the same time, reducing the temperature of the air compressor inlet will increase the density of the air, thereby improving the efficiency of the air compressor and reducing energy consumption;

[0019] 2. Through the design of the air filter, two arc-shaped plates are used to block part of the mesh of the inner filter cartridge. When the flow rate is met, the inner filter cartridge is driven to swing by the rotation of the first driving member and the second driving member. During the swinging process, the blocking position of the arc plate changes. At the same time, the rotation of the first driving member and the second driving member drives the dust suction pipe 31 and the arc-shaped siphon port 38 to reciprocate on the screw, thereby vacuuming the mesh blocked by the arc plate, realizing non-stop dust removal while avoiding direct negative pressure vacuuming that will cause unstable airflow entering the inner filter cartridge, thereby ensuring stable operation of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a work flow chart of the present invention;

[0021] Figure 2 is a cross-sectional view of an air filter of the present invention;

[0022] Figure 3 The present invention Figure 2 AA section view;

[0023] Figure 4 It is the right side view of air filter of the present invention. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] In the description of the invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] Embodiment 1:

[0027] In one technical solution of the present invention, Figure 1 As shown, a method for stable operation of an air compressor of a PTA main device is characterized by comprising an air filter 1 for filtering air, and a cooling water heat exchanger 2 for cooling and dehumidifying the filtered air;

[0028] The cooling water heat exchanger 2 cools the air and provides the cooled air to the multi-stage compressor system. The multi-stage compressor system is driven by the steam turbine 3. The multi-stage refrigerator system cooperates with the multi-stage compressor system. The multi-stage refrigerator system extracts heat from the compressed air of the multi-stage compressor system and uses the heated medium as a heat source to make the multi-stage refrigerator system refrigerate.

[0029] The multi-stage compressor system is used to deliver low temperature compressed air to the oxidation reactor 4;

[0030] The multi-stage refrigerator system includes a primary heat exchanger 5, a secondary heat exchanger 6 and a tertiary heat exchanger 7 for driving the refrigerator, and the primary heat exchanger 5, the secondary heat exchanger 6 and the tertiary heat exchanger 7 are used to cool down the compressed steam of the multi-stage compressor;

[0031] The multi-stage compressor system includes a primary air compressor 8, a secondary air compressor 9, a tertiary air compressor 10 and a quaternary air compressor 11. The cooling water heat exchanger 2 delivers dehumidified air to the primary air compressor 8. The outlet of the primary air compressor 8 is connected to the inlet of the primary heating heat exchanger 5. The outlet of the primary heating heat exchanger 5 is connected to the primary cooler 12. The primary cooler 12 is connected to the inlet of the secondary air compressor 9.

[0032] The outlet end of the secondary air compressor 9 is connected to the inlet end of the secondary heating heat exchanger 6, the outlet end of the secondary heating heat exchanger 6 is connected to the secondary cooler 13, the secondary cooler 13 is connected to the inlet end of the tertiary air compressor 10, the outlet end of the tertiary air compressor 10 is connected to the inlet end of the tertiary heat exchanger 7, the outlet end of the tertiary heat exchanger 7 is connected to the tertiary cooler 14, the tertiary cooler 14 is connected to the inlet end of the quaternary air compressor 11, and the outlet end of the quaternary air compressor 11 provides compressed air to the oxidation reactor 4;

[0033] The cooling water of the cooling water heat exchanger 2 provides circulating low-temperature cooling water through the refrigerator system.

[0034] In the above technical scheme: the multi-stage compressor system divides the air compression process into multiple stages. The type of compressor can be a piston compressor, a screw compressor or a centrifugal compressor. Each stage of the compressor compresses the air to a certain extent, so that the air pressure gradually increases to the final high pressure required. The steam turbine drives the compressor to operate through the steam turbine. The operation of the compressor allows the external air to enter the compressor after passing through the air filter 1 and the cooling water heat exchanger 2. The air filter 1 is used to filter the dust in the air. The cooling water heat exchanger 2 exchanges heat with the filtered air to reduce the temperature and humidity of the air entering the compressor, reduce pipeline corrosion and water droplets impacting the compressor impeller, and reduce the phenomenon of the unit jumping due to excessive vibration value of the air compressor. When the compression ratio of the compressor is constant, reducing the temperature of the air compressor inlet will increase the density of the air, which will improve the efficiency of the air compressor and reduce energy consumption;

[0035] The refrigeration system adopts an absorption refrigeration system. Since it is not a conventional setting in the field, it will not be described in detail. The applicant cites the conventional absorption refrigeration mechanism for reference: the absorption refrigerator uses a binary solution composed of two working fluids with different boiling points (such as lithium bromide-water or ammonia-water) to achieve refrigeration. Taking the lithium bromide absorption refrigerator as an example, in the generator, an external heat source (such as steam, hot water or waste heat) heats the lithium bromide-water solution to evaporate the water in the solution to form water vapor. The water vapor enters the condenser and is cooled and condensed into liquid, and then enters the evaporator after being reduced in pressure through the throttling device;

[0036] In the evaporator, the refrigerant (water) absorbs the heat of the cooled medium and evaporates to achieve refrigeration. The evaporated water vapor is absorbed by the absorbent (lithium bromide solution) and reforms into lithium bromide-water solution, which is then pumped to the generator to start a new cycle. The characteristic of the absorption refrigerator is that it can use low-grade thermal energy (such as industrial waste heat, solar energy, etc.) as a power source. In the case of a suitable heat source, it has a good energy-saving effect. In this application, compressed air is used as a power source;

[0037] The air after heat exchange, cooling and dehumidification in the cooling water heat exchanger 2 enters the primary compressor 8. The primary compressor 8 increases the temperature and pressure of the air after compressing the air and sends it to the primary heat exchanger 5 of the refrigeration system. The compressed high-temperature air is sent to the primary cooler 12 after the air temperature is reduced in the primary heat exchanger 5. The first cooler 12 is connected to the inlet of the secondary air compressor 9.

[0038] The outlet end of the secondary air compressor 9 is connected to the inlet end of the secondary heating heat exchanger 6, the outlet end of the secondary heating heat exchanger 6 is connected to the secondary cooler 13, the secondary cooler 13 is connected to the inlet end of the tertiary air compressor 10, the outlet end of the tertiary air compressor 10 is connected to the inlet end of the tertiary heat exchanger 7, the outlet end of the tertiary heat exchanger 7 is connected to the tertiary cooler 14, the tertiary cooler 14 is connected to the inlet end of the quaternary air compressor 11, and the outlet end of the quaternary air compressor 11 provides compressed air to the oxidation reactor 4;

[0039] In the above scheme: the whole machine power of the air compressor can be defined as the dependent variable, and the air compressor inlet air temperature can be defined as the independent variable for simulation analysis. When the air compressor inlet temperature drops from 39° to 15.8°, the air compressor power demand drops by 2 percentage points.

[0040] Embodiment 2:

[0041] In one technical solution of the present invention, Figure 2 - Figure 4 As shown, the air filter includes an outer filter cartridge 15, an inner filter cartridge 16 and a fixed box 17, the side wall of the fixed box 17 is provided with a rotating ring 18, one end of the inner filter cartridge 16 is fixedly connected to the rotating ring 18, the outer filter cartridge 15 is sleeved on the outer side of the inner filter cartridge 16, one end of the outer filter cartridge 15 is fixedly connected to the fixed box 17, and the other end is provided with an end cover 19, the other end of the inner filter cartridge 16 is rotatably mounted on the end cover 19 and communicated with the exhaust port 20;

[0042] A ring member 21 is fixedly installed in the middle of the end cover 19, and a first tie rod 22 is extended inward from the ring member 21, and the first tie rod 22 is connected to a first fixing rod 23, and the first fixing rod 23 is inserted into the inner filter cartridge 16, and the inner filter cartridge 16 extends a plurality of second tie rods 24 to connect the arc plate 25, and the arc plate 25 is in close contact with the inner filter cartridge 16;

[0043] The fixed box 17 is provided with a first rotating rod 26 fixedly connected to the rotating ring 18, and a rotating member 27 is sleeved on the first rotating rod 26. The rotating member 27 has an arc-shaped transition groove 8 and a U-shaped sliding groove 29;

[0044] There are two arc-shaped plates 25, each of which covers a quarter of the inner filter cartridge 16;

[0045] A first driving member and a second driving member for driving the rotating member 27 to swing, wherein the first driving member and the second driving member have the same structure;

[0046] The first driving member includes a screw 37 driven by a motor 36, and the screw 37 has a threaded sleeve 30, the threaded sleeve 30 is inserted between the inner filter cartridge 16 and the outer filter cartridge 15 and is rotatably connected to the end cover 19 through a bearing, and a dust suction pipe 31 is fixedly connected to the threaded sleeve 30, and the dust suction pipe 31 is used to dock with an external negative pressure suction device. A straight groove 32 is provided on the inner wall of the outer filter cartridge 15, and the dust suction pipe 31 is inserted into the straight groove 32. The other end of the dust suction pipe 31 is connected to an arc-shaped siphon port 38. A second arc plate 33 and a third pull rod 34 are fixedly connected to the screw 29 located in the fixed box 17, and a protrusion 35 is provided at the end of the third pull rod 34. During the rotation of the screw 37, the second arc plate 33 is driven to cooperate with the arc transition groove 28, and at the same time, the protrusion 35 is inserted into the U-shaped groove 29 to drive the rotating member 27 to rotate.

[0047] By adopting the above technical solution, in the present application, before the external air passes through the outer filter cartridge 15 and enters the outer filter cartridge 15 and the inner filter cartridge 16 during the operation of the compressor system, the filter mesh of the outer filter cartridge 15 is larger than the filter mesh of the inner filter cartridge 16, and the larger impurities in the external airflow that move with the airflow are blocked by the outer filter cartridge 15. The air is subjected to negative pressure between the outer filter cartridge 15 and the inner filter cartridge 16 and flows into the cooling water heat exchanger 2 after entering the inner filter cartridge 16. In this process, impurities larger than the filter mesh of the inner filter cartridge 16 are blocked and thus accumulated on the outer surface of the inner filter cartridge 16, which will cause the air flow to decrease after long-term operation. Therefore, after a period of operation;

[0048] The motors 36 of the first driving member and the second driving member are started. The motor 36 of the first driving member rotates forward, and the motor of the second driving member rotates reversely. The motor 36 of the first driving member drives the screw 37 to rotate during rotation. The screw 37 drives the threaded sleeve 30 to reciprocate on the screw 37 during rotation. During this process, the threaded sleeve 30 drives the dust suction pipe 31 and the arc-shaped siphon port 38 to move synchronously. At the same time, one end of the dust suction pipe 31 is in the linear slide groove 32 to ensure that the threaded sleeve 30 can reciprocate on the threaded sleeve 30.

[0049] When the outer surface of the inner filter cartridge 16 is vacuumed by connecting the external negative pressure suction device directly through the vacuum pipe 31, the blocked position of the filter mesh of the inner filter cartridge 16 is adjacent to the unblocked mesh. At this time, direct negative pressure vacuuming will cause the airflow entering the inner filter cartridge to be unstable. Based on this;

[0050] The dust suction pipe 31 is connected to an external negative pressure suction device. The connection method is that the dust suction pipe 31 passes through the end cover through a curved pipe and then connects to the negative pressure suction device. At the same time, in the above steps, the second arc plate 33 is driven to cooperate with the arc transition groove 28 during the rotation of the screw 37 of the first driving member. At the same time, the protrusion 35 is inserted into the U-shaped slide groove 29 to drive the rotating member 27 to rotate clockwise. During the rotation of the rotating member 27, the inner filter cartridge 16 is driven to rotate clockwise. The clockwise rotation of the inner filter cartridge 16 changes the closed surface of the inner filter cartridge 16 opposite to the arc siphon port 38, so that the arc siphon port 38 does not affect the filtered airflow during negative pressure suction. Similarly, during the rotation of the screw of the second driving member, the second arc plate is driven to cooperate with the arc transition groove. At the same time, the protrusion is inserted into the U-shaped slide groove to drive the rotating member to rotate counterclockwise to reset.

[0051] It should be noted that the arc-shaped siphon port 38 is the same size as the arc-shaped plate 25 .

[0052] In another embodiment of the present invention, the air filter comprises an outer filter cartridge 15, an inner filter cartridge 16 and a fixed box 17, the side wall of the fixed box 17 is provided with a rotating ring 18, one end of the inner filter cartridge 16 is fixedly connected to the rotating ring 18, the outer filter cartridge 15 is sleeved on the outside of the inner filter cartridge 16, one end of the outer filter cartridge 15 is fixedly connected to the fixed box 17, and the other end is provided with an end cover 19, the other end of the inner filter cartridge 16 is rotatably mounted on the end cover 19 and communicated with the exhaust port 20;

[0053] A ring member 21 is fixedly installed in the middle of the end cover 19, and a first tie rod 22 extends inward from the ring member 21. The first tie rod 22 is connected to a first fixing rod 23. The first fixing rod 23 is inserted into the inner filter cartridge 16. The inner filter cartridge 16 extends a plurality of second tie rods 24 to connect to an arc plate 25, and the arc plate 25 is fitted with the inner filter cartridge 16.

[0054] The fixed box 17 is provided with a first rotating rod 26 fixedly connected to the rotating ring 18, and a rotating member 27 is sleeved on the first rotating rod 26. The rotating member 27 has an arc-shaped transition groove 28 and a U-shaped sliding groove 29;

[0055] There are two arc-shaped plates 25, each of which covers a quarter of the inner filter cartridge 16;

[0056] A first driving member and a second driving member for driving the rotating member 27 to swing, wherein the first driving member and the second driving member have the same structure;

[0057] The first driving member includes a screw 37 driven by a motor 36, and the screw 37 has a threaded sleeve 30, the threaded sleeve 30 is inserted between the inner filter cartridge 16 and the outer filter cartridge 15 and is rotatably connected to the end cover 19 through a bearing, and a dust suction pipe 31 is fixedly connected to the threaded sleeve 30, and a linear slide groove 32 is provided on the inner wall of the outer filter cartridge 15, and the dust suction pipe 31 is inserted into the linear slide groove 32, and a second arc plate 33 and a third pull rod 34 are fixedly connected to the screw 37 located in the fixed box 17, and a protrusion 35 is provided at the end of the third pull rod 34. During the rotation of the screw 37, the second arc plate 33 is driven to cooperate with the arc transition groove 28, and at the same time, the protrusion 35 is inserted into the U-shaped slide groove 29 to drive the rotating member 27 to rotate.

[0058] The first fixing rod 23 is connected to an external blowing device so that gas can flow inside the first fixing rod 23, the second pull rod 24 and the arc plate 25. An exhaust hole is opened on the arc plate 25 to blow air into the inner filter cartridge 16 to remove dust. The exhaust hole and the hole of the inner filter cartridge 16 are opened in an offset manner.

[0059] By adopting the above technical solution: in the present application, before the external air passes through the outer filter cartridge 15 and enters the outer filter cartridge 15 and the inner filter cartridge 16 during the operation of the compressor system, the filter mesh of the outer filter cartridge 15 is larger than the filter mesh of the inner filter cartridge 16, and the larger impurities in the external airflow that move with the airflow are blocked by the outer filter cartridge 15. The air flows into the cooling water heat exchanger 2 after entering the inner filter cartridge 16 under the negative pressure between the outer filter cartridge 15 and the inner filter cartridge 16. In this process, the impurities larger than the filter mesh of the inner filter cartridge 16 are blocked and accumulated on the outer surface of the inner filter cartridge 16, which will cause the air flow to decrease after long-term operation. Therefore, after a period of operation;

[0060] The motors 36 of the first driving member and the second driving member are started. The motor 36 of the first driving member rotates forward, and the motor of the second driving member rotates reversely. The motor 28 of the first driving member drives the screw 37 to rotate during rotation. The screw 37 drives the threaded sleeve 30 to reciprocate on the screw 37 during rotation. During this process, the threaded sleeve 30 drives the dust suction pipe 31 and the arc-shaped siphon port 38 to move synchronously. At the same time, one end of the dust suction pipe 31 is in the linear slide groove 32 to ensure that the threaded sleeve 30 can reciprocate on the threaded sleeve 30.

[0061] The dust suction pipe 31 passes through the end cover to the air, and the first fixed rod 23 is connected to the external air blowing device, and the air blowing device blows air to the first fixed rod 23;

[0062] As a result, during the rotation of the screw rod 37 of the first driving member, the second arc plate 33 is driven to cooperate with the arc transition groove 28, and at the same time, the protrusion 35 is inserted into the U-shaped slide groove 29 to drive the rotating member 27 to rotate clockwise. During the rotation of the rotating member 27, the inner filter cartridge 16 is driven to rotate clockwise. When the inner filter cartridge 16 rotates clockwise so that the mesh holes of the inner filter cartridge 16 are connected with the mesh holes of the arc plate, the airflow impacts the inner filter cartridge and blows the accumulated dust on the surface of the inner filter cartridge toward the arc siphon port 38 and then is discharged from the dust suction pipe. Similarly, during the rotation of the screw rod of the second driving member, the second arc plate is driven to cooperate with the arc transition groove, and at the same time, the protrusion is inserted into the U-shaped slide groove to drive the rotating member to rotate counterclockwise to reset.

[0063] It should be noted that the arc-shaped siphon port 38 is of the same size as the arc-shaped plate 25 , and the mesh holes of the arc-shaped plate and the mesh holes of the inner filter cartridge are misaligned at the initial position and are connected during the rotation process.

[0064] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention. These improvements should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for stable operation of an air compressor of a PTA main device, characterized in that: It comprises an air filter (1) for filtering air, and a cooling water heat exchanger (2) for cooling and dehumidifying the filtered air; The cooling water heat exchanger (2) cools the air and provides the cooled air to the multi-stage compressor system. The multi-stage compressor system is driven by a steam turbine (3). The multi-stage refrigerator system cooperates with the multi-stage compressor system. The multi-stage refrigerator system extracts heat from the compressed air of the multi-stage compressor system and uses the heated medium as a heat source to make the multi-stage refrigerator system refrigerate. The multi-stage compressor system is used to deliver low temperature compressed air to the oxidation reactor (4).

2. A method for stable operation of an air compressor of a PTA main device according to claim 1, characterized in that: The multi-stage refrigeration system comprises a primary heat exchanger (5), a secondary heat exchanger (6) and a tertiary heat exchanger (7) for driving the refrigeration machine, wherein the primary heat exchanger (5), the secondary heat exchanger (6) and the tertiary heat exchanger (7) are used to cool down the compressed steam of the multi-stage compressor.

3. A method for stable operation of an air compressor of a PTA main device according to claim 2, characterized in that: The multi-stage compressor system comprises a primary air compressor (8), a secondary air compressor (9), a tertiary air compressor (10) and a quaternary air compressor (11); the cooling water heat exchanger (2) delivers dehumidified air to the primary air compressor (8); the outlet of the primary air compressor (8) is connected to the inlet of the primary heating heat exchanger (5); the outlet of the primary heating heat exchanger (5) is connected to the primary cooler (12); and the primary cooler (12) is connected to the inlet of the secondary air compressor (9); The outlet end of the secondary air compressor (9) is connected to the inlet end of the secondary heating heat exchanger (6), the outlet end of the secondary heating heat exchanger (6) is connected to the secondary cooler (13), the secondary cooler (13) is connected to the inlet end of the tertiary air compressor (10), the outlet end of the tertiary air compressor (10) is connected to the inlet end of the tertiary heat exchanger (7), the outlet end of the tertiary heat exchanger (7) is connected to the tertiary cooler (14), the tertiary cooler (14) is connected to the inlet end of the quaternary air compressor (11), and the outlet end of the quaternary air compressor (11) provides compressed air to the oxidation reactor (4).

4. A method for stable operation of an air compressor of a PTA main device according to claim 3, characterized in that: The cooling water of the cooling water heat exchanger (2) provides circulating low-temperature cooling water through a refrigeration system.

5. A method for stable operation of an air compressor of a PTA main device according to claim 1, characterized in that: The air filter comprises an outer filter cartridge (15), an inner filter cartridge (16) and a fixed box (17); a rotating ring (18) is provided on the side wall of the fixed box (17); one end of the inner filter cartridge (16) is fixedly connected to the rotating ring (18); the outer filter cartridge (15) is sleeved on the outside of the inner filter cartridge (16); one end of the outer filter cartridge (15) is fixedly connected to the fixed box (17); the other end of the outer filter cartridge (15) is provided with an end cover (19); the other end of the inner filter cartridge (16) is rotatably mounted on the end cover (19) and communicated with an exhaust port (20); A ring member (21) is fixedly installed in the middle of the end cover (19), a first pull rod (22) extends inward from the ring member (21), the first pull rod (22) is connected to a first fixing rod (23), the first fixing rod (23) is inserted into the inner filter cartridge (16), a plurality of second pull rods (24) extend from the inner filter cartridge (16) and are connected to an arc plate (25), and the arc plate (25) is fitted with the inner filter cartridge (16); A first rotating rod (26) fixedly connected to the rotating ring (18) is arranged in the fixed box (17), a rotating member (27) is sleeved on the first rotating rod (26), and the rotating member (27) has an arc-shaped transition groove (28) and a U-shaped sliding groove (29).

6. A method for stable operation of an air compressor of a PTA main device according to claim 5, characterized in that: There are two arc-shaped plates (25), and each arc-shaped plate (25) covers a quarter of the inner filter cartridge (16).

7. A method for stable operation of an air compressor of a PTA main device according to claim 5, characterized in that: a first driving member and a second driving member for driving the rotating member (27) to swing, wherein the first driving member and the second driving member have the same structure; The first driving member comprises a screw rod (37) driven by a motor (36), the screw rod (37) having a threaded sleeve (30), the threaded sleeve (30) being inserted between the inner filter cartridge (16) and the outer filter cartridge (15) and being rotatably connected to the end cover (19) via a bearing, a dust suction pipe (31) being fixedly connected to the threaded sleeve (30), the dust suction pipe (31) being used for docking with an external negative pressure suction device, a linear slide groove (32) being provided on the inner wall of the outer filter cartridge (15), the dust suction pipe (31) being inserted into the inner filter cartridge (16) and the outer filter cartridge (15). The vacuum tube (31) is inserted into the linear slide groove (32), and the other end of the vacuum tube (31) is connected to the arc-shaped siphon port (38). The screw (37) located on the fixed box (17) has a second arc-shaped plate (33) and a third pull rod (34) fixedly connected. The end of the third pull rod (34) has a protrusion (35). During the rotation of the screw (37), the second arc-shaped plate (33) is driven to cooperate with the arc-shaped transition groove (28). At the same time, the protrusion (35) is inserted into the U-shaped slide groove (29) to drive the rotating member (27) to rotate.

8. A method for stable operation of an air compressor of a PTA main device according to claim 5, characterized in that: The first fixed rod (23) is connected to an external blowing device so that gas can flow inside the first fixed rod (23), the second pull rod (24) and the arc plate (25). An exhaust hole is opened on the arc plate (25) to blow air into the inner filter cartridge (16) to remove dust. The exhaust hole and the hole of the inner filter cartridge (16) are opened in an offset manner.

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