Iron removal system and iron removal device for condensate treatment in styrene production

Abstract

The invention discloses an iron removal system and an iron removal device for treating process condensate in styrene production, and relates to the field of process condensate treatment. The iron removal process of the iron removal system is as follows: the process condensate is first pressurized by a lift pump, and then passes through a pressure reducing valve to reduce the pressure to 0.5MPa before entering an air-water mixer to be fully mixed with compressed air; the process condensate mixed with air enters an iron removal device, and the process condensate is oxidized to Fe3+ under the action of a catalyst, and Fe(OH)3 precipitation is formed after hydrolysis, most of which is Fe(OH)3 precipitation and is filtered and removed; the filtered process condensate enters a precision filter to remove the remaining iron in the water, so that its final water outlet meets the requirements of boiler water inlet. The present invention can realize the iron removal of process condensate, and the present invention makes the filter structure have excellent backwashing effect and high efficiency during the backwashing process by designing the overall structure of the internal filtering structure and the secondary backwashing mechanism of the iron removal device.

Description

Technical Field

[0001] The invention relates to the field of iron removal of process condensate, in particular to an iron removal system and an iron removal device for treating process condensate in styrene production. Background Art

[0002] As is known, in the styrene production process, the system uses steam for direct heating. After the reaction is completed and treated, the process condensate contains no more than 1 mg / l of organic matter such as styrene and ethylbenzene, and no more than 1.5 m / l of iron ions. Therefore, the process condensate cannot directly enter the boiler or other heat dissipation equipment of the chemical water treatment system of the thermal power plant to prevent the iron in the water from corroding the boiler and equipment.

[0003] The iron removal system and iron removal device for the treatment of process condensate in styrene production are used to remove iron from the process condensate in styrene production. In the existing iron removal methods and iron removal devices, oxidation precipitation method is adopted, that is, iron ions are converted into Fe(OH) 3 After that, during the process of filtering and removing iron, due to Fe(OH) 3 Precipitation can easily lead to blockage of the filter structure, and in existing iron removal devices, it is difficult to clear this blockage, thus affecting the filtering and iron removal effect of the device. Summary of the invention

[0004] 1. Purpose of the invention

[0005] In view of this, the purpose of the present invention is to propose an iron removal system and an iron removal device for treating process condensate in styrene production. The present invention can achieve iron removal of process condensate, and the present invention makes the filter structure have excellent backwashing effect and high efficiency during the backwashing process through the overall structural design of the internal filtering structure and the secondary backwashing mechanism of the iron removal device.

[0006] (II) Technical solution

[0007] In order to achieve the above technical purpose, the present invention provides an iron removal system for treating process condensate in styrene production. The iron removal process of the iron removal system is as follows:

[0008] Step S1: The process condensate is first pressurized by a lift pump, then passes through a pressure reducing valve to reduce the pressure to 0.5 MPa, and then enters an air-water mixer to be fully mixed with compressed air;

[0009] Step S2: The process condensate mixed with air enters the iron removal device, where it is oxidized into Fe under the action of the catalyst. 3+ , which forms Fe(OH) after hydrolysis 3 Precipitation, most of which is Fe(OH) 3 The precipitate is removed by filtration;

[0010] Step S3: The filtered process condensate enters a precision filter to remove the remaining iron in the water so that the final effluent meets the boiler inlet water requirements.

[0011] The present invention also discloses an iron removal device for use in an iron removal system for treating process condensate in styrene production, comprising:

[0012] The tank body serves as a container structure of the iron removal device;

[0013] A filtering mechanism is arranged inside the tank body and is used to filter and remove iron from the process condensate entering the tank body;

[0014] The secondary backwash mechanism is arranged inside the tank body and is used for backwashing the filtering mechanism.

[0015] As a further description of the above technical solution: the filtering mechanism includes an outer filter plate and an inner filter plate, wherein the outer filter plate and the inner filter plate are both cylindrical, the inner filter plate is sleeved on the inner side of the outer filter plate, and there is a gap between the outer filter plate and the inner filter plate to form a filtering space, and the filtering space is filled with filtering filler.

[0016] As a further description of the above technical solution: the outer filter plate adopts a multi-block splicing structure, and hydraulic telescopic rods are arranged above and below each block between the inner filter plates, so that each block can expand outward under the push of the hydraulic telescopic rods, and a layer of elastic barrier cloth is attached to the inner side of the outer filter plate.

[0017] As a further description of the above technical solution: the outer filter plate and the inner filter plate both adopt a porous structure with a plurality of backwash holes on the surface, and the axial direction of the backwash holes on the inner filter plate has an angle ∠α with the horizontal direction, and the value range of the angle ∠α is: 15°<∠α≤45°.

[0018] As a further description of the above technical solution: a plurality of elastic pocket cloths are arranged equidistantly from top to bottom in the filter space between the outer filter plate and the inner filter plate in the vertical direction, and the filter space is divided into a multi-layer structure by the plurality of elastic pocket cloths, and the elastic pocket cloths adopt a mesh structure.

[0019] As a further description of the above technical solution: the secondary backwash mechanism includes:

[0020] A secondary backwash ring, which is movably sleeved on the inner side of the inner filter plate and can move in the vertical direction, and the outer wall of the secondary backwash ring is provided with a plurality of spray holes that are equidistantly spaced along the circumference and are adapted to the backwash punching holes on the inner filter plate;

[0021] A secondary backwash water pipe joint, which is fixedly mounted on the top or bottom of the tank;

[0022] Wherein, the secondary backwash ring and the secondary backwash water pipe joint are connected via a backwash hose.

[0023] As a further description of the above technical solution: a support member is provided at the inner center position of the secondary backwash ring, and the support member and the secondary backwash ring are fixedly connected by a plurality of connecting rods, a lead screw nut is embedded and installed in the middle part of the support member, a lead screw is installed at the center position of the inner side of the tank body for rotation along the vertical direction, the lead screw is screwed and sleeved with the lead screw nut, and a servo motor for driving the lead screw to rotate is installed at the center position of the top of the tank body.

[0024] As a further description of the above technical solution: a cover body is detachably installed on the top of the tank body, the servo motor is installed above the cover body, a flat-blade plug shaft is connected to the output shaft of the servo motor, the top of the screw rod adopts a structure with a flat-blade slot, and the flat-blade plug shaft is inserted into the flat-blade slot.

[0025] As a further description of the above technical solution: a first-level backwash water pipe joint, a water outlet pipe joint and a backwash water discharge pipe are installed at the bottom of the tank body, wherein the first-level backwash water pipe joint is located at the center of the bottom of the tank body, and is used to inject backwash water to supply water for backwashing the filtering mechanism in the tank body, and the backwashed water is discharged through the backwash water discharge pipe. The water outlet pipe joint is used to connect the water outlet pipe to introduce the process condensate after iron removal into the precision filter. The tank body is also equipped with a catalyst addition port for adding catalyst into the tank body and a water inlet pipe joint for introducing process condensate into the tank body.

[0026] In the above technical scheme, the iron removal system for treating the process condensate in the production of styrene provided by the present invention can realize the iron removal of the process condensate, that is, when the untreated process condensate enters the tank body 1, it reacts with the catalyst inside the tank body 1, so that the iron in the process condensate is oxidized into Fe 3+ , which forms Fe(OH) after hydrolysis 3 precipitation, while Fe(OH) 3 The precipitate is discharged after being filtered by the filtering mechanism, thus achieving iron removal of the process condensate;

[0027] The iron removal device in the present invention is provided with a secondary backwash mechanism inside, so that the iron removal device as a whole has a secondary backwash function, so that the filtering mechanism can be backwashed after the tank body has been used for filtering for a period of time, thereby ensuring the filtering function of the filtering mechanism, improving the overall iron removal effect of the device, and reducing blockage. In addition, through the overall structural design of the filtering structure and the secondary backwash mechanism, the filtering structure has an excellent backwashing effect and high efficiency during the backwashing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0029] Figure 1 The overall structural schematic diagram of the iron removal system and the iron removal device for treating the process condensate in styrene production provided by the present invention;

[0030] Figure 2 A bottom view of an iron removal device for treating condensate in styrene production provided by the present invention;

[0031] Figure 3 A schematic diagram of the structure of the iron removal device for treating condensate in styrene production provided by the present invention after the cover is opened;

[0032] Figure 4 A schematic diagram of the internal structure of an iron removal device for treating condensate in styrene production provided by the present invention;

[0033] Figure 5 A schematic diagram of the structure of the outer filter plate in the filtering mechanism of the iron removal device for treating the process condensate in the production of styrene provided by the present invention when it is expanded outwards;

[0034] Figure 6 A schematic diagram of the structure of the filtering mechanism in the iron removal device for treating the condensate in the process of styrene production provided by the present invention;

[0035] Figure 7 A partial cross-sectional view of a filtering mechanism in an iron removal device for treating condensate in styrene production provided by the present invention;

[0036] Figure 8 A schematic diagram of the structure of the inner filter plate in the iron removal device for treating the condensate in the process of styrene production provided by the present invention;

[0037] Fig. 9 A cross-sectional view of an inner filter plate in an iron removal device for treating condensate in styrene production provided by the present invention;

[0038] Fig.10 A schematic diagram of the structure of a secondary backwash mechanism in an iron removal device for treating condensate in styrene production provided by the present invention;

[0039] Fig.11 A schematic diagram of the structure after the servo motor and the lead screw are separated in the secondary backwash mechanism of the iron removal device for treating the process condensate in the styrene production provided by the present invention;

[0040] Fig.12, Fig.13 , Fig.14 The PID diagram of the iron removal system for treating process condensate in styrene production provided by the present invention.

[0041] Description of the drawings: 1. Tank body; 100. Cover body; 101. Peeping mirror; 102. Bracket; 103. Backwash water discharge pipe; 104. Water inlet pipe joint; 105. Lifting ear; 106. Water outlet pipe joint; 107. Primary backwash water pipe joint; 108. Catalyst addition port; 2. Filter mechanism; 200. Outer filter plate; 201. Inner filter plate; 2010. Backwash punching hole; 202. Hydraulic telescopic rod; 203. Elastic barrier cloth; 204. Filter filler; 205. Elastic pocket cloth; 3. Secondary backwash mechanism; 300. Screw nut; 301. Secondary backwash ring; 3010. Spray hole; 302. Backwash hose; 303. Secondary backwash water pipe joint; 304. Servo motor; 3040. Slotted shaft; 305. Support member; 306. Sliding sleeve; 307. Sliding rod; 308. Screw. DETAILED DESCRIPTION

[0042] The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, and use. It should be understood that in all of these figures, the same or similar reference numerals indicate the same or similar parts and features. The various drawings only schematically represent the concepts and principles of the embodiments of the present disclosure, and do not necessarily show the specific dimensions and proportions of the various embodiments of the present disclosure. Specific parts in specific drawings may be exaggerated to illustrate the relevant details or structures of the embodiments of the present disclosure.

[0043] Example 1

[0044] Reference Fig.12 , Fig.13 , Fig.14 :This embodiment provides a technical solution: an iron removal system for treating condensate in styrene production, and the iron removal process of the iron removal system is as follows:

[0045] Step S1: The process condensate is first pressurized by a lift pump, then passes through a pressure reducing valve to reduce the pressure to 0.5 MPa, and then enters an air-water mixer to be fully mixed with compressed air;

[0046] Step S2: The process condensate mixed with air enters the iron removal device, where it is oxidized into Fe under the action of the catalyst. 3+ , which forms Fe(OH) after hydrolysis 3 Precipitation, most of which is Fe(OH) 3 The precipitate is filtered and removed, wherein the catalyst is modified rare earth porcelain sand;

[0047] Step S3: The filtered process condensate enters a precision filter to remove the remaining iron in the water so that the final effluent meets the boiler inlet water requirements.

[0048] It should be noted that: since the water quality of the process condensate is relatively good, with an electrical conductivity of about 10μs / cm, the treated water can be directly used as the inlet water of the boiler system or for other equipment in the styrene device. The precision filter is used to intercept the remaining iron in the filtration system, as well as the occasional loss of broken particles and impurities that may remain in the pipeline, etc., to ensure that the system outlet water meets the inlet water requirements of the boiler system. A precision filter of Ф700 is used, and each unit is equipped with 51 40" temperature-resistant filter elements; the normal water treatment capacity of a single unit is 40m3 / h, the filter element is a temperature-resistant filter element, the filtration accuracy is 0.22μm, the filter body is made of SS304 stainless steel, and the control of the precision filter adopts differential pressure control. When the inlet and outlet pressure difference of the precision filter is greater than the set value (0.05MPa), the filter element is replaced. The filter element in the precision filter is a replaceable cassette filter rod, and the structure of the precision filter can meet the requirements of rapid replacement of the filter element.

[0049] Example 2

[0050] Reference Figure 1 - Fig.11 :This embodiment provides a technical solution: an iron removal device for a deironing system used for treating process condensate in styrene production, comprising a tank body 1, a filter mechanism 2 and a secondary backwash mechanism 3, wherein the tank body 1 serves as a container structure of the iron removal device; the filter mechanism 2 is arranged inside the tank body 1, and is used to filter and remove iron from the process condensate entering the tank body 1; the secondary backwash mechanism 3 is arranged inside the tank body 1, and is used to backwash the filter mechanism 2. When the untreated process condensate enters the tank body 1, it reacts with the catalyst inside the tank body 1, so that the iron in the process condensate is oxidized into Fe 3+ , which forms Fe(OH) after hydrolysis 3 Precipitation, Fe(OH) 3 The precipitate is discharged after being filtered by the filter mechanism 2, and the setting of the secondary backwash mechanism 3 enables the entire iron removal device to have a secondary backwash function, so that the tank body 1 can backwash the filter mechanism 2 after a period of filtering, thereby ensuring the filtering function of the filter mechanism 2, improving the overall iron removal effect of the device, and reducing blockage.

[0051] Specifically, the filtering mechanism 2 includes an outer filter plate 200 and an inner filter plate 201, wherein the outer filter plate 200 and the inner filter plate 201 are both cylindrical, the inner filter plate 201 is sleeved on the inner side of the outer filter plate 200, and there is a gap between the outer filter plate 200 and the inner filter plate 201 to form a filtering space, and the filtering space is filled with filtering filler 204. Such a structural arrangement enables the iron removal device to have a triple filtering structure, namely the outer filter plate 200, the inner filter plate 201 and the filtering filler 204, so that the filtering and iron removal effect of the iron removal device is better.

[0052] Furthermore, the outer filter plate 200 adopts a multi-block splicing structure, and hydraulic telescopic rods 202 are provided above and below each block between the inner filter plate 201, so that each block can expand outward under the push of the hydraulic telescopic rod 202, and a layer of elastic barrier cloth 203 is attached to the inner side of the outer filter plate 200. When all the blocks of the outer filter plate 200 shrink inward to the minimum, the outer filter plate 200 is cylindrical. At this time, the filter filler 204 in the filter space densely fills the entire filter space to ensure the filtering function. When the blocks of the outer filter plate 200 expand outward under the push of the hydraulic telescopic rod 202, the filter space expands. At this time, the filter filler 204 in the filter space no longer densely fills the entire filter space. In this state, the secondary backwash mechanism 3 is activated. When the filter packing 204 is backwashed and sprayed, the filter packing 204 can be loosened, so that the filtered matter in the gap of the filter packing 204 can be fully cleared by backwashing, thereby improving the filtering effect of the filter packing 204 after backwashing. After backwashing, each block of the outer filter plate 200 is driven by the hydraulic telescopic rod 202 to shrink inward until it forms a cylindrical shape. At this time, the filter packing 204 in the filter space is squeezed and transformed again to fill the entire filter space, completing the backwashing process. The setting of the elastic barrier cloth 203 on the inner side of the outer filter plate 200 makes it possible for the gaps between the blocks to be sealed under the barrier of the elastic barrier cloth 203 when the blocks of the outer filter plate 200 expand outward. Therefore, it can be ensured that the filter packing 204 will not leak from the gaps between the blocks.

[0053] Furthermore, both the outer filter plate 200 and the inner filter plate 201 adopt a porous structure with a plurality of backwashing holes 2010 on the surface. It should be noted that: the diameter of the backwashing holes 2010 is much smaller than the minimum particle size of the filter filler 204, and the axial direction of the backwashing holes 2010 on the inner filter plate 201 has an angle ∠α with the horizontal direction, and the value range of the angle ∠α is: 15°<∠α≤45°. The backwashing holes 2010 of this inclined structure are arranged so that when the secondary backwashing mechanism 3 is in backwashing operation, the water of the backwashing operation can impact the filter filler 204 in the filter space from bottom to top, so that the filter filler 204 can be lifted up by an upward force, so that the filter between the filter fillers 204 can be fully flushed out, thereby improving the filterability. The backwashing effect is improved. It should be noted that: after testing, when the angle ∠α between the axial direction and the horizontal direction of the backwashing punch 2010 is less than 15°, the flushing angle is too low during the backwashing operation. Therefore, the water pressure of the one-time flushing needs to be increased significantly to achieve the effect of lifting the filter filler 204. When the angle ∠α between the axial direction and the horizontal direction of the backwashing punch 2010 is greater than 45°, the flushing angle is too large during the backwashing operation, and it is difficult to flush all the filter fillers 204 on the same layer, resulting in lower flushing efficiency and worse effect. When the angle ∠α between the axial direction and the horizontal direction of the backwashing punch 2010 is less than 45° and greater than 15°, it can flush the filter fillers 204 on the same layer at the same time, and the flushing water pressure is moderate.

[0054] Furthermore, a plurality of elastic pocket cloths 205 are equidistantly arranged in the vertical direction from top to bottom in the filter space between the outer filter plate 200 and the inner filter plate 201, and the filter space is divided into a multi-layer structure by the plurality of elastic pocket cloths 205. The elastic pocket cloths 205 adopt a mesh structure, and the mesh diameter of the elastic pocket cloth 205 is much smaller than the minimum particle size of the filter filler 204. It should be noted that the mesh diameter of the elastic pocket cloth 205 is the diameter after the outer filter plate 200 is stretched when it is expanded. Such a structural setting ensures that when the outer filter plate 200 is expanded, the filter filler 204 in the filter space will not be completely accumulated to the bottom of the filter space. It should be noted that when the elastic pocket cloth 205 is not provided, when the outer filter plate 200 is expanded, the filter filler 204 in the filter space is accumulated to the bottom of the filter space. When the outer filter plate 200 is contracted and reset, the filter filler 204 appears and accumulates at the bottom of the filter space, and cannot be completely restored to fill the entire filter space, that is, a part of the area above the filter space is left empty, affecting the filtering and iron removal effect of the device.

[0055] Specifically, the secondary backwash mechanism 3 includes a secondary backwash ring 301 and a secondary backwash water pipe connector 303, wherein the secondary backwash ring 301 is movably sleeved on the inner side of the inner filter plate 201 and can move in the vertical direction, and the outer wall of the secondary backwash ring 301 is equidistantly provided with a plurality of spray holes 3010 adapted to the backwash punching holes 2010 on the inner filter plate 201 along the circumferential direction, and the secondary backwash water pipe connector 303 is fixedly mounted on the top or the bottom of the tank body 1. At the bottom, the secondary backwash ring 301 is connected to the secondary backwash water pipe joint 303 through a backwash hose 302. Such a structural arrangement enables the backwash water to enter the secondary backwash ring 301 through the backwash hose 302 when the backwash water is connected to the secondary backwash water pipe joint 303, and then be sprayed into the backwash punching hole 2010 on the inner filter plate 201 through the spray hole 3010 on the secondary backwash ring 301, thereby achieving a secondary backwash effect on the filter filler 204 in the filter space.

[0056] Specifically, a support member 305 is provided at the inner center position of the secondary backwash ring 301, and the support member 305 and the secondary backwash ring 301 are fixedly connected by multiple connecting rods. A lead screw nut 300 is embedded in the middle of the support member 305, and a lead screw 308 is installed in the vertical direction at the inner center position of the tank body 1. The lead screw 308 and the lead screw nut 300 are screwed and sleeved, and a servo motor 304 for driving the lead screw 308 to rotate is installed at the top center position of the tank body 1. This structural arrangement enables the lead screw 308 to rotate when the servo motor 304 is running. With the cooperation of the lead screw nut 300, the support member 305 and the secondary backwash ring 301 move in the vertical direction, thereby realizing comprehensive backwashing of the filter mechanism 2.

[0057] Specifically, a cover body 100 is detachably installed on the top of the tank body 1, and a servo motor 304 is installed above the cover body 100. A slotted shaft 3040 is connected to the output shaft of the servo motor 304. The top of the screw rod 308 adopts a structure with a slotted shaft, and the slotted shaft 3040 is inserted into the slotted shaft. Such a structural arrangement enables the output shaft of the servo motor 304 to be separated from the screw rod 308 when the cover body 100 is opened, so as to facilitate the maintenance or replacement of the internal structure of the tank body 1. A sliding sleeve 306 is installed on at least one of the connecting rods, and a limiting sliding rod 307 is installed in the vertical direction inside the tank body 1. The limiting sliding rod 307 is slidably sleeved in the sliding sleeve 306. Such a structural arrangement enables the secondary backwash ring 301 to have higher stability when moving downward, thereby ensuring that the spray holes 3010 on the secondary backwash ring 301 are aligned with the backwash punching holes 2010 on the inner filter plate 201, thereby ensuring the backwash effect.

[0058] Furthermore, a first-level backwash water pipe joint 107, a water outlet pipe joint 106 and a backwash water discharge pipe 103 are installed at the bottom of the tank body 1, wherein the first-level backwash water pipe joint 107 is located at the center of the bottom of the tank body 1, and is used to inject backwash water to supply water for backwashing the filter mechanism 2 in the tank body 1, and the backwashed water is discharged through the backwash water discharge pipe 103. The water outlet pipe joint 106 is used to connect the water outlet pipe to introduce the process condensate after iron removal into the precision filter. A sight glass 101 is embedded on the front surface of the tank body 1 to assist in observing the internal structure of the tank body 1. A bracket 102 is installed at the bottom of the tank body 1, and two lifting ears 105 are symmetrically installed above the cover body 100. The tank body 1 is also equipped with a catalyst addition port 108 for adding catalyst into the tank body 1 and an inlet pipe joint 104 for introducing process condensate into the tank body 1. Specifically, the inlet pipe joint 104 and the backwash water discharge pipe 103 are both connected to the outside of the filter mechanism 2.

[0059] The exemplary implementation scheme of the present disclosure is described in detail above with reference to the preferred embodiments. However, it can be understood by those skilled in the art that, without departing from the concept of the present disclosure, various modifications and variations can be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present disclosure can be combined in various ways without exceeding the protection scope of the present disclosure, which is determined by the attached claims.

Claims

1. An iron removal device for an iron removal system for treating process condensate in styrene production, characterized in that: include: A tank body (1) serving as a container structure of the iron removal device; A filtering mechanism (2) is arranged inside the tank body (1) and is used to filter and remove iron from the process condensate entering the tank body (1). The filtering mechanism (2) comprises an outer filter plate (200) and an inner filter plate (201), wherein the outer filter plate (200) and the inner filter plate (201) are both cylindrical, the inner filter plate (201) is sleeved on the inner side of the outer filter plate (200), and a gap is provided between the outer filter plate (200) and the inner filter plate (201) to form a filtering space, wherein the filtering space is filled with filtering filler (204), and the outer filter plate (200) adopts a multi-block splicing structure, wherein each block is located above and below the inner filter plate. A hydraulic telescopic rod (202) is arranged between the plates (201), so that each block can expand outward under the push of the hydraulic telescopic rod (202); the outer filter plate (200) and the inner filter plate (201) both adopt a porous structure with a plurality of backwash punching holes (2010) provided on the surface; a layer of elastic barrier cloth (203) is attached to the inner side of the outer filter plate (200); a plurality of elastic pocket cloths (205) are arranged equidistantly from top to bottom in the filtering space between the outer filter plate (200) and the inner filter plate (201) along the vertical direction; the filtering space is divided into a multi-layer structure by the plurality of elastic pocket cloths (205); the elastic pocket cloths (205) adopt a mesh structure; A secondary backwash mechanism (3) is arranged inside the tank body (1) and is used for backwashing the filter mechanism (2). The secondary backwash mechanism (3) comprises a secondary backwash ring (301) and a secondary backwash water pipe joint (303), wherein the secondary backwash ring (301) is movably sleeved on the inner side of the inner filter plate (201) and is movable in a vertical direction. The outer wall of the secondary backwash ring (301) is provided with a plurality of spray holes (3010) which are equidistantly arranged along the circumference and are adapted to the backwash punching holes (2010) on the inner filter plate (201). The secondary backwash water pipe joint (303) is fixedly mounted on the top or bottom of the tank body (1). The secondary backwash ring (301) and the secondary backwash water pipe joint (303) are connected via a backwash hose (302).

2. The iron removal device of the iron removal system for treating condensate in the production of styrene according to claim 1, characterized in that: The backwash punching holes (2010) on the inner filter plate (201) have an angle ∠α between the axial direction and the horizontal direction, and the value range of the angle ∠α is: 15°<∠α≤45°.

3. The iron removal device of the iron removal system for treating the process condensate in the production of styrene according to claim 1, characterized in that: A support member (305) is provided at the center position of the inner side of the secondary backwash ring (301); the support member (305) is fixedly connected to the secondary backwash ring (301) via a plurality of connecting rods; a lead screw nut (300) is embedded and installed in the middle of the support member (305); a lead screw (308) is rotatably installed in the vertical direction at the center position of the inner side of the tank body (1); the lead screw (308) is screwed and sleeved with the lead screw nut (300); and a servo motor (304) for driving the lead screw (308) to rotate is installed at the center position of the top of the tank body (1).

4. The iron removal device of the iron removal system for treating the process condensate in the production of styrene according to claim 3, characterized in that: The top of the tank body (1) is detachably mounted with a cover body (100); the servo motor (304) is mounted above the cover body (100); a slotted shaft (3040) is connected to the output shaft of the servo motor (304); the top of the lead screw (308) has a slotted shaft, and the slotted shaft (3040) is inserted into the slotted shaft.

5. The iron removal device of the iron removal system for treating the process condensate in the production of styrene according to claim 4, characterized in that: The bottom of the tank body (1) is provided with a first-level backwash water pipe joint (107), a water outlet pipe joint (106) and a backwash water discharge pipe (103), wherein the first-level backwash water pipe joint (107) is located at the center of the bottom of the tank body (1) and is used to inject backwash water to supply water to the filter mechanism (2) in the tank body (1) for backwashing, and the backwashed water is discharged through the backwash water discharge pipe (103). The water outlet pipe joint (106) is used to connect the water outlet pipe to guide the process condensate after iron removal into the precision filter. The tank body (1) is also provided with a catalyst addition port (108) for adding a catalyst into the tank body (1) and a water inlet pipe joint (104) for introducing the process condensate into the tank body (1).

6. Use of the iron removal device of the iron removal system for treating condensate in the process of styrene production as claimed in any one of claims 1 to 5 in an iron removal system, characterized in that: The iron removal process of the iron removal system is as follows: Step S1: The process condensate is first pressurized by a lift pump, then passes through a pressure reducing valve to reduce the pressure to 0.5 MPa, and then enters an air-water mixer to be fully mixed with compressed air; Step S2: The process condensate mixed with air enters the iron removal device, where it is oxidized into Fe under the action of the catalyst. 3+ , after hydrolysis, Fe(OH)3 precipitate is formed, most of which is filtered out; Step S3: The filtered process condensate enters a precision filter to remove the remaining iron in the water so that the final effluent meets the boiler inlet water requirements.

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