Sulfur recovery flue expansion joint combination piece with heat energy recovery effect

Abstract

This utility model discloses a sulfur recovery flue gas expansion joint assembly with heat recovery effect, including an expansion joint body installed on the flue gas duct of the sulfur recovery system. The expansion joint body includes a corrosion-resistant corrugated pipe, a jacketed heat recovery mechanism, and an associated component that limits the transition displacement of the jacketed heat recovery mechanism. The jacketed heat recovery mechanism is sleeved on the outside of the corrosion-resistant corrugated pipe, and the jacketed heat recovery mechanism uses the inner and outer expansion joints to form a dehydration circulation cavity. This utility model, through the cooperation of the corrosion-resistant corrugated pipe, the jacketed heat recovery mechanism, and the associated mechanism, enables the expansion joint body to achieve integrated operation of heat recovery and corrosion protection. By using the jacketed heat recovery mechanism to form a dehydration circulation cavity with the inner and outer expansion joints, the expansion joint body can be cooled down, while increasing its corrosion resistance and service life, thereby improving the stable operation of the sulfur recovery system.

Description

Technical Field

[0001] This utility model relates to the field of chemical environmental protection equipment technology, specifically a sulfur recovery flue expansion joint assembly with heat recovery effect. Background Technology

[0002] In sulfur recovery units, expansion joints are typically installed at critical locations such as flues and reactor inlets / outlets to compensate for pipeline displacement caused by temperature changes and mechanical vibrations. For example, in the tail gas flue of a sulfur recovery unit, due to the high temperature and corrosive gases in the tail gas, high-temperature and corrosion-resistant metal expansion joints or non-metallic expansion joints (such as fabric expansion joints) are often selected. These expansion joints not only effectively compensate for pipeline displacement but also resist corrosion and erosion from the tail gas, ensuring the long-term stable operation of the system.

[0003] Currently, traditional expansion joints consist of a single layer of 316L stainless steel with a refractory lining and high-temperature refractory felt filling the gaps. It is difficult to manufacture them as a whole, and their lifespan is less than 6 months in high-temperature flue gas containing Cl- (>50ppm) and SO2. Since the tail gas temperature of sulfur recovery flue is around 1000℃, the current single anti-corrosion coating is not resistant to high temperatures. If a ceramic coating is used, it is prone to thermal shock cracking, which reduces the stable operation of the sulfur recovery system. Therefore, we need to propose a sulfur recovery flue expansion joint connector with heat recovery effect to solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to provide a sulfur recovery flue expansion joint connector with heat recovery effect. Through the integrated design of heat recovery and corrosion prevention, the inner and outer expansion joints form a cavity, which increases the corrosion resistance of the expansion joint, improves the service life of the expansion joint, and improves the stable operation of the sulfur recovery system, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a sulfur recovery flue expansion joint assembly with heat recovery effect, comprising an expansion joint body installed on the flue of the sulfur recovery system, the expansion joint body comprising a corrosion-resistant corrugated pipe, a jacketed heat recovery mechanism, and an associated component for limiting the transition displacement of the jacketed heat recovery mechanism.

[0006] The jacketed heat recovery mechanism is sleeved on the outside of the anti-corrosion corrugated pipe. The jacketed heat recovery mechanism uses inner and outer expansion joints to form a dehydration circulation cavity. The associated components are respectively connected to the jacketed heat recovery mechanism and the anti-corrosion corrugated pipe.

[0007] Preferably, the anti-corrosion corrugated pipe includes a corrugated pipe with corrugations prepared by hydroforming, and the inner wall of the corrugated pipe is coated with a gradient coating, which is composed of a Cr2O3 layer, an Al2O3 layer and a SiO2 layer from the inside to the outside.

[0008] Preferably, the jacketed heat recovery mechanism includes a jacket layer, an outer expansion joint layer, and an inner expansion joint layer. The outer expansion joint layer, the jacket layer, and the inner expansion joint layer are arranged in a stepped manner, and the surfaces of the jacket layer, the outer expansion joint layer, and the inner expansion joint layer are all provided with an anti-corrosion coating.

[0009] Preferably, the associated component includes tie rods located on both sides of the anti-corrosion corrugated pipe, the two ends of the tie rods being connected to the two ends of the anti-corrosion corrugated pipe via connecting plates, and the two ends of the anti-corrosion corrugated pipe being fixed to the flue via flanges.

[0010] Preferably, the jacketed heat recovery mechanism further includes a boiler water interface located on the inner layer of the expansion joint and a steam interface located on the outer layer of the expansion joint, and the cavity is formed through the gap between the inner layer and the outer layer of the expansion joint.

[0011] Preferably, the cavity is equipped with a spiral baffle plate for extending the residence time of demineralized water, a steam separator for outputting dry steam is installed at the steam interface inside the cavity, and a drain valve for discharging condensate from the jacket is provided at the lower end of the jacket layer.

[0012] Preferably, the pitch-to-diameter ratio of the spiral baffle is 0.3, and the spiral baffle is welded to the inner layer of the expansion joint.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model, through the cooperation of anti-corrosion corrugated pipe, jacketed heat recovery mechanism and related mechanisms, enables the expansion joint body to achieve integrated operation of heat recovery and anti-corrosion. The jacketed heat recovery mechanism uses the inner and outer expansion joints to form a dehydration circulation cavity, which can cool the expansion joint body, increase the corrosion resistance of the expansion joint body, and improve the service life of the expansion joint body, thereby improving the stable operation of the sulfur recovery system.

[0015] 2. By setting up associated components, this utility model can limit the transitional displacement of the expansion joint body, protect the expansion joint, maintain structural stability, provide fixed protection during transportation and installation, balance forces in multiple directions, and improve system safety. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the expansion joint body structure of this utility model;

[0018] Figure 3 This is a top view schematic diagram of the jacket layer structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the stacked structure of the expansion joint body of this utility model;

[0020] Figure 5 This is a process diagram for the application of this utility model.

[0021] In the diagram: 1. Expansion joint body; 11. Jacket layer; 12. Tie rod; 13. Anti-corrosion coating; 14. Boiler water interface; 15. Steam interface; 16. Outer layer of expansion joint; 17. Inner layer of expansion joint; 2. Smoke pipe; 3. Flange. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-4 This utility model provides a technical solution: a sulfur recovery flue gas expansion joint assembly with heat recovery effect, including an expansion joint body 1 installed on the flue gas duct of the sulfur recovery system. The expansion joint body 1 includes a corrosion-resistant corrugated pipe, a jacketed heat recovery mechanism, and an associated component that limits the transition displacement of the jacketed heat recovery mechanism. The jacketed heat recovery mechanism is sleeved on the outside of the corrosion-resistant corrugated pipe. The jacketed heat recovery mechanism uses the inner and outer expansion joints to form a dehydration circulation cavity. The associated component is connected to the jacketed heat recovery mechanism and the corrosion-resistant corrugated pipe respectively. Through the cooperation of the corrosion-resistant corrugated pipe, the jacketed heat recovery mechanism, and the associated mechanism, the expansion joint body 1 can achieve integrated operation of heat recovery and corrosion protection. By using the jacketed heat recovery mechanism to form a dehydration circulation cavity with the inner and outer expansion joints, the expansion joint body 1 can be cooled down, while increasing the corrosion resistance of the expansion joint body 1 and improving the service life of the expansion joint body 1, thereby improving the stable operation of the sulfur recovery system.

[0024] The corrosion-resistant corrugated pipe includes a corrugated pipe with corrugations prepared by hydroforming. The corrugation path of the corrugated pipe can compensate for the thermal displacement of the pipeline. The inner wall of the corrugated pipe is coated with a gradient coating. The gradient coating is set as Cr2O3 layer, Al2O3 layer and SiO2 layer from the inside to the outside. Utilizing the material properties of the gradient coating, the corrosion-resistant corrugated pipe can withstand a high temperature of 800℃. High-temperature flue gas containing Cl*, SO2 and NH3 enters (around 1000℃) and flows through the expansion joint. The expansion joint body 1 is cooled by the jacketed heat recovery mechanism, so that the temperature of the corrosion-resistant corrugated pipe wall is lower than 800℃ and higher than the sulfuric acid dew point temperature, which is greater than 180℃.

[0025] The jacketed heat recovery mechanism includes a jacket layer 11, an outer expansion joint layer 16, and an inner expansion joint layer 17. The outer expansion joint layer 16, the jacket layer 11, and the inner expansion joint layer 17 are arranged in a stepped manner, and the surfaces of the jacket layer 11, the outer expansion joint layer 16, and the inner expansion joint layer 17 are all provided with an anti-corrosion coating 13. The jacketed heat recovery mechanism also includes a boiler water interface 14 located on the inner expansion joint layer 17 and a steam interface located on the outer expansion joint layer 16. The cavity is formed through the gap between the inner expansion joint layer 17 and the outer expansion joint layer 16.

[0026] The desalinated water is supplied through the desalination inlet (connected to the desalination water source via flange 3). A pneumatic regulating valve is installed on the water pipe to control the flow rate, which is maintained between 0.5-1.2 m³ / h. 3 The high-temperature flue gas enters the cavity at a pressure of 1 / h. As the flue gas flows through the flue, heat is transferred through the inner layer 17 of the expansion joint to the demineralized water within the cavity. The demineralized water absorbs heat, its temperature rises, and it generates steam at 0.3-0.5 MPa. The steam is output from the steam outlet (connected to the steam transmission pipe via a quick-connect clamp; the steam transmission pipe is equipped with a check valve and pressure gauge to prevent steam backflow and monitor pressure, ensuring the steam transmission pressure is 0-1.0 MPa), thus achieving heat recovery. Simultaneously, the demineralized water absorbs heat to cool the expansion joint body 1, keeping the temperature of the anti-corrosion corrugated pipe wall below 800℃ and above the sulfuric acid dew point temperature (above 180℃). This ensures the anti-corrosion corrugated pipe operates within a safe temperature range and avoids low-temperature corrosion.

[0027] The coaxiality of the jacket layer 11 with the anti-corrosion corrugated pipe is ≤0.5mm (laser alignment calibration), the thermal expansion gap is 2-3mm (pre-calculated compensation), the spiral baffle is optimized with a pitch / diameter ratio of 0.3 (for optimal turbulence), and the welding strength to the inner wall of the jacket is ≥85% of the base material. The desalination inlet is connected to the desalination water source via flange 3, and a pneumatic regulating valve is installed on the connected water pipe to control the flow rate of desalinated water entering the cavity, keeping the flow rate between 0.5-1.2m³. 3 / h, the steam outlet is connected to the steam transmission pipe via a quick-connect clamp. The steam transmission pipe is equipped with a check valve and a pressure gauge to prevent backflow of the transmitted steam and to monitor the gas steam transmission pressure, ensuring that the steam transmission pressure is 0-1.0MPa.

[0028] The associated components include tie rods 12 located on both sides of the anti-corrosion corrugated pipe. The two ends of the tie rods 12 are connected to the two ends of the anti-corrosion corrugated pipe through connecting plates. The two ends of the anti-corrosion corrugated pipe are fixed to the flue pipe 2 through flanges 3. The anti-corrosion corrugated pipe and flanges 3 can be fully penetrated for welding. The tie rods 12 and connecting plates are connected by threads, which makes it easy to adjust the length of the tie rods 12 between the two connecting plates according to actual installation requirements. This limits the extension length of the anti-corrosion corrugated pipe, prevents excessive displacement of the jacketed heat recovery mechanism, and ensures the structural stability of the expansion joint and the normal functioning of heat recovery and anti-corrosion.

[0029] The cavity is equipped with a spiral baffle plate for extending the residence time of demineralized water. A steam separator for outputting dry steam is installed at the steam interface 15 inside the cavity. A drain valve for discharging condensate from the jacket is provided at the lower end of the jacket layer 11. The pitch-to-diameter ratio of the spiral baffle plate is 0.3. The spiral baffle plate is welded to the inner layer 17 of the expansion joint.

[0030] The demineralized water inside the chamber absorbs heat from the flue gas to generate 0.3-0.5 MPa steam. An optimized spiral baffle design allows the demineralized water to flow in a spiral pattern within the chamber, increasing the contact time and area between the demineralized water and the inner layer 17 of the expansion joint, thus improving heat exchange efficiency and achieving a heat recovery rate of ≥40%. A steam separator is installed at the steam interface 15 inside the chamber to output dry steam and improve steam quality. A drain valve is installed at the lower end of the jacket layer 11 to discharge condensate generated within the jacket, ensuring the normal operation of the jacketed heat recovery mechanism.

[0031] like Figure 5 As shown, the sulfur recovery system includes a tail gas incinerator, a high-temperature cyclone mixer, and tail gas treatment equipment. The tail gas incinerator is connected to the high-temperature cyclone mixer, and the high-temperature cyclone mixer is connected to the tail gas treatment equipment. Expansion joints are installed at the inlet and outlet of the high-temperature cyclone mixer and at the inlet of the tail gas treatment equipment. The expansion joints are installed on the flue of the sulfur recovery system. While realizing heat energy recovery, they also have anti-corrosion function. Through the coordinated work of related components, the temperature of the expansion joint body 1 is reduced, corrosion resistance is increased, service life is improved, and the stable operation of the sulfur recovery system is ensured.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sulfur recovery flue gas expansion joint with heat recovery effect, characterized in that: The expansion joint body (1) is installed on the flue of the sulfur recovery system. The expansion joint body (1) includes a corrosion-resistant corrugated pipe, a jacketed heat recovery mechanism, and associated components for limiting the transition displacement of the jacketed heat recovery mechanism. The jacketed heat recovery mechanism is sleeved on the outside of the anti-corrosion corrugated pipe. The jacketed heat recovery mechanism uses inner and outer expansion joints to form a dehydration circulation cavity. The associated components are respectively connected to the jacketed heat recovery mechanism and the anti-corrosion corrugated pipe.

2. The expansion joint component for sulfur recovery flue gas duct with heat recovery effect according to claim 1, characterized in that: The corrosion-resistant corrugated pipe includes a corrugated pipe with corrugations prepared by hydroforming, and the inner wall of the corrugated pipe is coated with a gradient coating, which is composed of a Cr2O3 layer, an Al2O3 layer and a SiO2 layer from the inside to the outside.

3. The sulfur recovery flue gas expansion joint assembly with heat recovery effect according to claim 2, characterized in that: The jacketed heat recovery mechanism includes a jacket layer (11), an outer expansion joint layer (16), and an inner expansion joint layer (17). The outer expansion joint layer (16), the jacket layer (11), and the inner expansion joint layer (17) are arranged in a stepped manner, and the surfaces of the jacket layer (11), the outer expansion joint layer (16), and the inner expansion joint layer (17) are all provided with an anti-corrosion coating (13).

4. The expansion joint component for sulfur recovery flue gas duct with heat recovery effect according to claim 3, characterized in that: The associated components include tie rods (12) located on both sides of the anti-corrosion corrugated pipe. The two ends of the tie rods (12) are connected to the two ends of the anti-corrosion corrugated pipe through connecting plates. The two ends of the anti-corrosion corrugated pipe are fixed to the flue (2) through flanges (3).

5. The expansion joint component for sulfur recovery flue gas duct with heat recovery effect according to claim 4, characterized in that: The jacketed heat recovery mechanism also includes a boiler water interface (14) located on the inner layer (17) of the expansion joint and a steam interface located on the outer layer (16) of the expansion joint, the cavity being formed through the gap between the inner layer (17) and the outer layer (16) of the expansion joint.

6. The expansion joint component for sulfur recovery flue gas duct with heat recovery effect according to claim 5, characterized in that: The cavity is equipped with a spiral baffle plate for extending the residence time of demineralized water. A steam separator for outputting dry steam is installed at the steam interface (15) inside the cavity. A drain valve for discharging condensate from the jacket is provided at the lower end of the jacket layer (11).

7. The expansion joint component for sulfur recovery flue gas duct with heat recovery effect according to claim 6, characterized in that: The pitch-to-diameter ratio of the spiral baffle is 0.3, and the spiral baffle is welded to the inner layer (17) of the expansion joint.

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