Flue gas desulfurization system and method based on membrane separation technology

Abstract

The invention relates to a flue gas desulfurization system and method based on a membrane separation technology, and the system comprises a flue gas pretreatment unit which comprises a flue gas preheater and a dust remover and is used for increasing the flue gas temperature and removing particulate matters; the membrane separation unit comprises a membrane bracket and a membrane component and is used for separating sulfur dioxide in the flue gas; the tail gas treatment unit comprises a tail gas purifier and a condensate treatment device and is used for treating the tail gas and the condensate after membrane separation; and the control system comprises a sensor and an automatic control device and is used for monitoring and adjusting system operation parameters in real time. Through the steps of flue gas pretreatment, membrane separation, tail gas treatment and system control, sulfur dioxide in flue gas is efficiently removed, the problem of low-temperature flue gas corrosion is solved, and the desulfurization efficiency and the equipment durability are improved. The system has the advantages of high efficiency, corrosion resistance, energy conservation, environmental protection, automatic control and the like, and is suitable for flue gas treatment in industries such as coal-fired power plants, iron and steel smelting, petrochemical engineering and the like.

Description

Technical Field

[0001] This application relates to the field of flue gas desulfurization technology, and particularly to a flue gas desulfurization system and method based on membrane separation technology. Background Art

[0002] Traditional flue gas desulfurization technologies (such as wet desulfurization) have problems such as high energy consumption, complex wastewater treatment, and equipment corrosion. Membrane separation technology has advantages such as high efficiency, energy conservation, and environmental protection, but it is vulnerable to corrosion in the treatment of low-temperature flue gas. Therefore, it is of great significance to develop an efficient and corrosion-resistant flue gas desulfurization system and method based on membrane separation technology. Summary of the Invention

[0003] The purpose of this application is to provide a flue gas desulfurization system and method based on membrane separation technology, solve the problem of low-temperature flue gas corrosion, and improve desulfurization efficiency and equipment durability.

[0004] A flue gas desulfurization system based on membrane separation technology provided by this application adopts the following technical solutions:

[0005] A flue gas desulfurization system based on membrane separation technology, the device includes:

[0006] A flue gas pretreatment unit, including a flue gas preheater and a dust collector, for increasing the flue gas temperature and removing particulate matter;

[0007] A membrane separation unit, including a membrane support and a membrane module, for separating sulfur dioxide in the flue gas;

[0008] A tail gas treatment unit, including a tail gas purifier and a condensate treatment device, for treating the tail gas and condensate after membrane separation; and

[0009] A control system, including sensors and an automatic control device, for real-time monitoring and adjusting the system operation parameters.

[0010] As a preferred technical solution of this application, the flue gas preheater includes a cylindrical heating jacket and a heating component arranged inside the heating jacket. One end of the heating jacket is connected with a flue gas inlet, and the other end is connected with the dust collector. An installation cavity for installing the membrane separation unit is arranged inside the heating jacket.

[0011] As a preferred technical solution of this application, the dust collector includes an air inlet chamber communicated with the internal space of the heating jacket and a filtration chamber communicated with the air inlet chamber. A detachable filter net is arranged inside the filtration chamber. An air inlet is opened on the side wall of the air inlet chamber, and an exhaust port for communicating with the air inlet is opened at the end of the inner wall of the heating jacket.

[0012] As a preferred technical solution of the present application, an installation ring is provided on the inner wall of the heating sleeve, and the dust collector is elastically connected to the installation ring through a plurality of connecting springs. The end of the air inlet chamber away from the filter chamber is hermetically connected to the inner wall of the heating sleeve, and the connection area between the air inlet and the exhaust port is adjustable.

[0013] As a preferred technical solution of the present application, the membrane support includes a connection support connected to the inner wall of the heating sleeve and a plurality of groups of membrane mounting frames connected to the connection support. The connection support is hermetically connected to the inner wall of the heating sleeve, and the membrane module is connected to the membrane mounting frame.

[0014] As a preferred technical solution of the present application, the connection support is arranged as a cylindrical structure with a cross-section adapted to the shape of the inner wall of the heating sleeve. The membrane mounting frame is arranged inside the connection support. Installation openings opposite to the position of the membrane mounting frame are provided on the side wall of the connection support. The membrane module is installed on the membrane mounting frame through the installation openings. One end of the connection support is open and faces the dust collector, and the other end is open and faces away from the dust collector.

[0015] As a preferred technical solution of the present application, the tail gas purifier is connected to the end of the connection support facing away from the dust collector, and the tail gas purifier is arranged outside the installation cavity. A tail gas adsorption and purification module is provided inside the tail gas purifier, and a purified gas outlet is provided outside the tail gas purifier.

[0016] As a preferred technical solution of the present application, the condensate treatment device is connected to the outside of the tail gas purifier or the side facing away from the connection support, and the condensate treatment device is in communication with the inside of the tail gas purifier.

[0017] As a preferred technical solution of the present application, the sensor includes a temperature sensor for monitoring the flue gas temperature and a pressure sensor for monitoring the system pressure.

[0018] A flue gas desulfurization method based on membrane separation technology provided by the present application adopts the following technical solutions:

[0019] A flue gas desulfurization method based on membrane separation technology includes the following steps:

[0020] S1: Flue gas pretreatment, the temperature of the flue gas is increased through a flue gas preheater to prevent the formation of acidic condensate, and particulate matter is removed through a dust collector;

[0021] S2: Membrane separation, the pretreated flue gas is introduced into the membrane separation unit, and sulfur dioxide is separated by using the membrane module;

[0022] S3: Tail gas treatment, the tail gas after membrane separation is introduced into the tail gas purifier to remove residual acidic substances, and the condensate is collected and treated by using the condensate treatment device;

[0023] System control: The temperature and pressure parameters in steps S1 - S3 are monitored and adjusted in real time through the control system to ensure the efficient operation of the system.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. This application uses membrane separation technology to efficiently remove sulfur dioxide from flue gas, with high desulfurization efficiency.

[0026] 2. The membrane module of this application uses corrosion - resistant materials and anti - corrosion coatings, effectively solving the problem of low - temperature flue gas corrosion and improving the durability of the equipment.

[0027] 3. This application realizes automatic operation through the control system, improving operation convenience and system stability.

[0028] 4. In this application, the dust collector, membrane module, and membrane support are all placed in the installation cavity formed by the heating jacket, making the structure of the whole system more compact, with a small volume and occupied space, facilitating the movement and installation of the equipment.

[0029] 5. In this application, the flue gas pre - heater is set in the shape of a hollow cylinder. When the flue gas passes through the heating jacket, it can better contact the heating components, thus keeping the flue gas at a relatively high temperature, facilitating desulfurization.

[0030] 6. In this application, the membrane separation unit is set in the heating jacket, and the heating jacket insulates the membrane separation unit to prevent the pre - heated flue gas from cooling too much during transportation, which affects normal desulfurization, especially when this system is applied in cold outdoor weather, thereby ensuring the desulfurization efficiency of the whole system.

[0031] 7. In this application, the heating jacket and the dust collector are elastically connected by a connecting spring. When the flue gas pressure transmitted from the heating jacket to the dust collector is small, under the action of its own gravity or the tensile force of the connecting spring, the dust collector makes the communication surface between the exhaust port and the intake port smaller, which can ensure a relatively high flow rate of the flue gas and improve the efficiency of dust removal from the flue gas and subsequent desulfurization; when the flue gas pressure transmitted from the heating jacket to the dust collector is large, the pressure will push the dust collector to move outward to the installation cavity, making the exhaust port and the intake port fully connected, improving the flue gas discharge efficiency and desulfurization treatment efficiency. The system can automatically adjust the size of the exhaust volume according to the change of the flue gas pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is the schematic flow - structure diagram of the embodiment of this application;

[0033] Figure 2 is the schematic external - shape structure diagram of the whole machine of the system of the embodiment of this application;

[0034] Figure 3It is a schematic internal structure diagram of the whole system in the embodiment of the present application;

[0035] Figure 4 It is a schematic connection structure diagram of a flue gas preheater and a dust collector in the embodiment of the present application;

[0036] Figure 5 It is a schematic connection structure diagram of a flue gas preheater and a membrane support in the embodiment of the present application;

[0037] Figure 6 It is a schematic connection structure diagram of an exhaust gas purifier and a condensate treatment device in the embodiment of the present application;

[0038] In the figure, 1 is a flue gas preheater; 11 is a heating jacket; 12 is a heating component; 13 is a flue gas inlet; 14 is an installation cavity; 15 is an exhaust port; 16 is an installation ring; 2 is a dust collector; 21 is an air inlet chamber; 22 is a filtration chamber; 23 is a filter screen; 24 is an air inlet; 25 is a connecting spring; 3 is a membrane support; 31 is a connecting bracket; 32 is a membrane mounting frame; 33 is an installation opening; 4 is a membrane module; 5 is an exhaust gas purifier; 51 is an exhaust gas adsorption and purification module; 52 is a purified gas outlet; 6 is a condensate treatment device; 7 is an automatic control device. Detailed implementation manners

[0039] The following will Figure 1 - Attach Figure 6 , and make a further detailed description of the present application.

[0040] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0041] Embodiment: The present application proposes a flue gas desulfurization system based on membrane separation technology, which is applicable to flue gas treatment in industries such as coal-fired power plants, iron and steel smelting, and petrochemical industries. Refer to Figures 1-6, the whole system includes a flue gas pretreatment unit, a membrane separation unit, a tail gas treatment unit and a control system. Among them, the flue gas pretreatment unit includes a flue gas preheater 1 and a dust remover 2. The flue gas preheater 1 is connected to the flue gas source and is used to increase the temperature of the flue gas to prevent the formation of acidic condensate. The dust remover 2 is connected to the flue gas preheater 1 and is used to remove particulate matter in the flue gas; the membrane separation unit includes a membrane support 3 and a membrane module 4. The membrane module 4 is installed in groups on the membrane support 3. The membrane support 3 is connected to the flue gas preheater 1 or the dust remover 2. The membrane module 4 is used to separate sulfur dioxide in the flue gas; the tail gas treatment unit includes a tail gas purifier 5 and a condensate treatment device 6. The tail gas purifier 5 is connected to the outlet end of the membrane separation unit and is used to treat the tail gas after membrane separation and remove harmful substances in the tail gas. The condensate treatment device 6 is installed in the tail gas purifier 5 and is used to treat the condensate formed during the cooling of the tail gas; the control system includes sensors and an automatic control device 7. The sensors include a temperature sensor and a pressure sensor. The temperature sensor is used to monitor the temperature of the flue gas at each stage, and the pressure sensor is used to monitor the pressure of the flue gas at each stage, so that the automatic control device 7 can adjust the operating parameters of each stage of the system in real time according to the monitoring data of the sensors.

[0042] Referring to Figure 2 and 3 , the flue gas preheater 1 includes a heating jacket 11 and a heating component 12. The heating jacket 11 is cylindrical and can be a cylindrical tube or a square tube. In this embodiment, a cylindrical tube is used. The heating jacket 11 includes two inner and outer cylindrical sleeves. There is an interlayer for flue gas to pass through between the two sleeves. The interlayer is also cylindrical. The two ends of the heating jacket 11 are sealed by annular plates. The heating jacket 11 can be placed horizontally or vertically, which is selected according to actual needs. In this embodiment, the heating jacket 11 is placed vertically.

[0043] The heating component 12 is arranged in the inner interlayer of the heating jacket 11. The heating component 12 can adopt electric heating wires or electric heating rods and is uniformly arranged on the inner sleeve of the heating jacket 11 for heating the flue gas.

[0044] In this embodiment, a plurality of flue gas inlets 13 are uniformly arranged at the lower end of the heating jacket 11 for connection with the flue gas source through pipelines. The upper end of the heating jacket 11 is connected to the dust remover 2. A cylindrical installation cavity 14 is formed inside the heating jacket 11, and the membrane separation unit is installed inside the installation cavity 14.

[0045] Exemplarily, a plurality of exhaust ports 15 are arranged in a circle along the circumferential direction at the upper part of the inner sleeve of the heating jacket 11 for discharging the preheated flue gas and communicating with the internal space of the dust remover 2 through the exhaust ports 15. In this embodiment, the exhaust ports 15 are strip-shaped, and the vertical direction is the length direction.

[0046] Referring to Figure 4, on the side wall of the heating sleeve 11 located inside the installation cavity 14, there are two sets of upper and lower opposite mounting rings 16. The height of the mounting rings 16 is lower than that of the exhaust port 15. The dust collector 2 is installed on the upper side of the upper mounting ring 16, and the membrane separation unit is installed on the lower side of the lower mounting ring 16. A fan that blows air towards the membrane separation unit is installed between the two mounting rings 16 to promote the flow of flue gas.

[0047] The dust collector 2 includes two parts, an air inlet chamber 21 and a filtration chamber 22. Both parts are provided with an outer shell and an internally connected space. The air inlet chamber 21 is cylindrical, with its top extending out of the installation cavity 14 and sealed. The outer side wall of the air inlet chamber 21 is closely attached to and sealed with the side wall of the installation cavity 14. A ring of air inlets 24 is provided on the side wall of the air inlet chamber 21. The air inlets 24 correspond one-to-one with the exhaust ports 15, and the air inlets 24 are also set as long strips with the up-down direction as the length direction. The air inlet chamber 21 is connected to the internal interlayer space of the heating sleeve 11 through the air inlets 24. The filtration chamber 22 is connected to the side of the air inlet chamber 21 extending into the installation cavity 14. The filtration chamber 22 is connected to the air inlet chamber 21 through a flange. An exhaust passage is provided on the bottom plate of the filtration chamber 22, and a detachable filter net 23 is installed in the filtration chamber 22 for filtering particulate matter.

[0048] In some embodiments, the dust collector 2 is elastically connected to the mounting ring 16 through a plurality of connecting springs 25. Specifically, the plurality of connecting springs 25 are axially parallel and evenly distributed. The upper ends of the connecting springs 25 are connected to the bottom plate of the filtration chamber 22, and the lower ends of the connecting springs 25 are connected to the upper mounting ring 16. Through the connecting springs 25, the relative position of the dust collector 2 and the heating sleeve 11 can be adjusted, and thus the connection area between the air inlet 24 and the exhaust port 15 can be adjusted. When the flue gas pressure transmitted from the heating sleeve 11 to the dust collector 2 is small, under the action of its own gravity, the dust collector 2 makes the lower part of the exhaust port 15 communicate with the upper part of the air inlet 24 and the communication area is small, which can ensure a high flow rate of the flue gas and improve the efficiency of dust removal and subsequent desulfurization of the flue gas; when the flue gas pressure transmitted from the heating sleeve to the dust collector is large, the pressure will push the dust collector 2 to move upward, making the connection area between the exhaust port 15 and the air inlet 24 increase and achieve full connection, increasing the flow rate of the flue gas and improving the emission efficiency of the flue gas and the desulfurization treatment efficiency.

[0049] When disassembling and replacing the filter net 23, the dust collector 2 can be pulled out of the installation cavity 14.

[0050] Refer to Figure 5 , the membrane support 3 includes a connecting support 31 and a membrane mounting frame 32. The connecting support 31 is connected to the inner wall of the heating sleeve 11, and several groups of membrane mounting frames 32 are connected along the axis direction of the connecting support 31, capable of installing several groups of membrane components 4.

[0051] Exemplarily, the connecting bracket 31 is arranged as a cylindrical structure with a cross-section adapted to the inner wall shape of the heating sleeve 11, so that the connecting bracket 31 is hermetically connected to the inner wall of the heating sleeve 11. The upper and lower ends of the connecting bracket 31 are open for the inlet and outlet of flue gas. The upper end of the connecting bracket 31 is bolted to the lower mounting ring 16. A plurality of membrane mounting frames 32 are arranged inside the connecting bracket 31 and parallel to the upper and lower end faces of the connecting bracket 31. In this embodiment, the membrane mounting frame 32 is a clamping plate with a sandwich space in the middle, and the membrane mounting frame 32 is provided with through slots penetrating through the upper and lower sides. An installation opening 33 corresponding to the position of the membrane mounting frame 32 is provided on the side wall of the connecting bracket 31. An opening is provided on one side of the sandwich space of the membrane mounting frame 32 opposite to the installation opening 33 for the insertion of the membrane module 4. The membrane module 4 is installed on the membrane mounting frame 32 through the installation opening 33.

[0052] In this embodiment, the membrane module 4 is made of corrosion-resistant material and is provided with an anti-corrosion coating on the surface, such as stainless steel or ceramic membrane. A sulfur dioxide separation outlet is provided on the membrane module 4 and communicated to the outside of the heating sleeve 11. The separated sulfur dioxide can be recycled or enter the treatment device for treatment. The flue gas treated by the dust collector 2 enters the membrane separation unit, and after the sulfur dioxide is separated by the membrane module 4, it is discharged and enters the tail gas treatment unit.

[0053] Referring to Figure 6 , the tail gas purifier 5 is connected to the lower end of the connecting bracket 31. The lower end of the connecting bracket 31 extends out of the heating sleeve 11, so that the tail gas purifier 5 is arranged outside the installation cavity 14. A tail gas adsorption and purification module 51 is arranged inside the tail gas purifier 5. The tail gas adsorption and purification module 51 is arranged as an activated carbon adsorption or chemical absorption device. A purified gas outlet 52 is arranged outside the tail gas purifier 5. In this embodiment, the bottom plate of the tail gas purifier 5 is arranged with a high center and gradually decreasing edges, and the condensate is gathered through the low-lying area at the edge of the bottom plate. The purified gas outlet 52 is arranged at the highest point of the bottom plate of the tail gas purifier 5, which can effectively prevent the condensate from being discharged with the tail gas from the purified gas outlet 52.

[0054] The condensate treatment device 6 is installed on the outside or lower side of the tail gas purifier 5. In this embodiment, the condensate treatment device 6 is arranged as an annular structure and coaxially installed on the bottom plate of the tail gas purifier 5. The position of the purified gas outlet 52 is left open in the middle of the condensate treatment device, and it is communicated with the inside of the tail gas purifier 5 through the bottom plate of the tail gas purifier 5. The condensate gathered on the bottom plate of the tail gas purifier 5 can enter the condensate treatment device 6 for treatment.

[0055] The temperature sensor and the pressure sensor are connected to the automatic control device 7 through wires and transmit the monitoring data to the automatic control device 7. The automatic control device 7 is connected to the flue gas preheater 1, the membrane module 4, and the tail gas purifier 5 through wires to control the flue gas preheater 1, the membrane module 4, and the tail gas purifier 5. In this embodiment, the automatic control device 7 is installed outside the heating jacket 11.

[0056] This application also proposes a flue gas desulfurization method based on membrane separation technology. Combining with the attached Figure 1 , the steps of this method are as follows:

[0057] S1: Flue gas pretreatment. The flue gas enters the heating jacket 11 through the flue gas inlet 13, and the temperature of the flue gas is increased by the heating component 12 to prevent the formation of acidic condensate. The flue gas enters the dust collector 2 through the air inlet 24, and the solid particles in the flue gas are removed by the filter screen 23.

[0058] S2: Membrane separation. The pretreated flue gas is transported by a fan and introduced into the membrane separation unit. The membrane module 4 is used to separate sulfur dioxide, and the separated sulfur dioxide is discharged through the sulfur dioxide separation outlet. The tail gas enters the tail gas treatment link.

[0059] S3: Tail gas treatment. The tail gas after membrane separation is introduced into the tail gas purifier 5. The tail gas will be cooled to form condensate again. The acidic substances will be absorbed by the tail gas adsorption and purification module 51. The condensate will be collected and treated by the condensate treatment device 6. The treated tail gas will be discharged through the purified gas outlet 52.

[0060] System control. The temperature and pressure parameters of the flue gas preheater 1, the dust collector 2, and the tail gas purifier 5 in steps S1 - S3 are monitored and adjusted in real time through the control system to ensure the efficient operation of the system.

[0061] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. The same components are denoted by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A flue gas desulfurization system based on membrane separation technology, characterized in that: The device includes: A flue gas pretreatment unit, comprising a flue gas preheater (1) and a dust collector (2), for increasing the flue gas temperature and removing particulate matter; A membrane separation unit, comprising a membrane support (3) and a membrane assembly (4), for separating sulfur dioxide from flue gas; An exhaust gas treatment unit, comprising an exhaust gas purifier (5) and a condensate treatment device (6), for treating the exhaust gas and condensate after membrane separation; and The control system includes sensors and automatic control devices (7) for real-time monitoring and adjustment of system operating parameters.

2. A flue gas desulfurization system based on membrane separation technology according to claim 1, characterized in that: The flue gas preheater (1) comprises a cylindrical heating jacket (11) and a heating assembly (12) arranged in the heating jacket (11); one end of the heating jacket (11) is connected to a flue gas inlet (13) and the other end is connected to a dust collector (2); and an installation cavity (14) for installing a membrane separation unit is arranged in the heating jacket (11).

3. A flue gas desulfurization system based on membrane separation technology according to claim 2, characterized in that: The dust collector (2) comprises an air intake bin (21) connected to the internal space of the heating sleeve (11) and a filter bin (22) connected to the air intake bin (21); a detachable filter screen (23) is arranged in the filter bin (22); an air intake port (24) is provided on the side wall of the air intake bin (21); and an exhaust port (15) for connecting to the air intake port (24) is provided at the end of the inner wall of the heating sleeve (11).

4. A flue gas desulfurization system based on membrane separation technology according to claim 3, characterized in that: A mounting ring (16) is provided on the inner wall of the heating sleeve (11); the dust collector (2) and the mounting ring (16) are elastically connected via a plurality of connecting springs (25); an end of the air inlet bin (21) away from the filter bin (22) is sealedly connected to the inner wall of the heating sleeve (11); and the connection area between the air inlet (24) and the exhaust port (15) is adjustable.

5. A flue gas desulfurization system based on membrane separation technology according to any one of claims 2 to 4, characterized in that: The membrane support (3) comprises a connecting support (31) connected to the inner wall of the heating sleeve (11) and a plurality of groups of membrane mounting frames (32) connected to the connecting support (31); the connecting support (31) and the inner wall of the heating sleeve (11) are hermetically connected, and the membrane assembly (4) is connected to the membrane mounting frame (32).

6. A flue gas desulfurization system based on membrane separation technology according to claim 5, characterized in that: The connecting bracket (31) is configured as a cylindrical structure whose cross section is adapted to the shape of the inner wall of the heating sleeve (11); the membrane mounting frame (32) is arranged inside the connecting bracket (31); a mounting opening (33) opposite to the position of the membrane mounting frame (32) is provided on the side wall of the connecting bracket (31); the membrane assembly (4) is mounted on the membrane mounting frame (32) through the mounting opening (33); one end of the connecting bracket (31) is open and faces the dust collector (2), and the other end is open and faces away from the dust collector (2).

7. A flue gas desulfurization system based on membrane separation technology according to claim 6, characterized in that: The exhaust gas purifier (5) is connected to one end of the connecting bracket (31) away from the dust collector (2), and the exhaust gas purifier (5) is arranged outside the installation cavity (14), an exhaust gas adsorption purification module (51) is arranged inside the exhaust gas purifier (5), and a purified gas outlet (52) is arranged outside the exhaust gas purifier (5).

8. A flue gas desulfurization system based on membrane separation technology according to claim 7, characterized in that: The condensate treatment device (6) is connected to the outside of the exhaust gas purifier (5) or to a side away from the connection bracket (31), and the condensate treatment device (6) is in communication with the inside of the exhaust gas purifier (5).

9. A flue gas desulfurization system based on membrane separation technology according to any one of claims 2-4 and 6-8, characterized in that: The sensors include a temperature sensor for monitoring the flue gas temperature and a pressure sensor for monitoring the system pressure.

10. A flue gas desulfurization method based on membrane separation technology, characterized in that: The following steps are involved: S1: Flue gas pretreatment, which increases the flue gas temperature through a flue gas preheater (1) to prevent the formation of acid condensate, and removes particulate matter through a dust collector (2); S2: membrane separation, passing the pretreated flue gas into a membrane separation unit, and separating sulfur dioxide using a membrane assembly (4); S3: tail gas treatment, passing the tail gas after membrane separation into a tail gas purifier (5) to remove residual acidic substances, and collecting and treating the condensate using a condensate treatment device (6); System control: monitor and adjust the temperature and pressure parameters in steps S1-S3 in real time through the control system to ensure efficient operation of the system.

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