High-temperature acidic flue gas superheating device

Abstract

This utility model relates to the technical field of waste sulfuric acid regeneration equipment, specifically a high-temperature acidic flue gas superheating device. It includes a split-type superheating device, with anti-corrosion layers and L-shaped overflow baffles fixedly installed on the upper and lower inner sides of the device, respectively. An annular overflow groove is formed between the overflow baffles and the corresponding inner walls of the split-type superheating device. This utility model has a reasonable and compact structure, is easy to use, and by fixing the anti-corrosion layer to the upper inner side of the split-type superheating device, and connecting the liquid inlet end of the device to the acidic coolant pipeline via a flexible hose, it achieves the goal of preventing corrosion of the high-temperature acidic flue gas as it passes through the device. It features safety and reliability, flexible and easy disassembly, good water resistance and sealing, and a small overall weight, reducing the load-bearing coefficient of subsequent equipment, facilitating operation, improving work efficiency, and significantly reducing subsequent installation and maintenance costs.

Description

Technical Field

[0001] This utility model relates to the technical field of waste sulfuric acid regeneration equipment, and is a high-temperature acidic flue gas superheating device. Background Technology

[0002] In some industrial production processes, specific treatment or utilization of flue gas is required. High-temperature acidic flue gas superheating devices can provide suitable process conditions for subsequent processes. For example, in sulfur-to-acid production processes and waste sulfuric acid cracking processes, the high-temperature flue gas from the sulfur incinerator outlet needs to be cooled before entering the absorption section to produce sulfuric acid. Superheating devices can reduce the flue gas temperature to a suitable range, which helps improve the production efficiency and quality of sulfuric acid.

[0003] The high-temperature acidic flue gas superheating device has the following advantages:

[0004] (1) The structural design and manufacturing are simple, and the installation method is simple;

[0005] (2) It is corrosion resistant, high temperature resistant, and wear resistant, and is suitable for various acid production environments;

[0006] (3) Low cost and long service life, which can save costs for enterprises.

[0007] Therefore, high-temperature acidic flue gas superheaters have been widely used in sulfuric acid production processes and waste sulfuric acid cracking processes. However, with the continuous development of industrial production technology, the application scenarios of high-temperature acidic flue gas superheaters are also constantly expanding. Consequently, the performance and reliability requirements for high-temperature acidic flue gas superheaters are becoming increasingly stringent.

[0008] Currently, the manufacturing and design technologies for high-temperature acidic flue gas superheating devices are relatively mature, but some problems still need to be solved. For example, the corrosion problem of the superheater is still difficult to completely solve, especially during long-term operation, where water in the acidic gas corrodes the superheating protection layer, leading to its detachment and a decline in equipment performance. The sealing performance, stability, and installation and maintenance of the device also need further optimization. The overall quality of the device is still affected by its installation location, posing a risk of damaging equipment in subsequent processes.

[0009] Existing technical problems:

[0010] (1) The water resistance of the high-temperature acid flue gas overheating device is poor, and the overheating protection layer falls off, resulting in a short service life. High-temperature acid flue gas is often mixed with water vapor. Water vapor, together with acidic medium, accelerates corrosion and erosion of the overheating protection layer, causing the protection layer to fall off.

[0011] (2) The overheating device has poor sealing performance and the coolant connection method is fixed, making installation and maintenance difficult. Defects in the sealing structure lead to leakage of flue gas and acidic coolant, resulting in energy waste and environmental pollution; the fixed coolant connection method requires high installation accuracy, and subsequent maintenance, disassembly, and reassembly are cumbersome, making fault repair difficult and time-consuming.

[0012] (3) The overall mass of the overheating device is large, which increases the load-bearing coefficient of the equipment in the subsequent process section. The excessive overall mass increases the load-bearing coefficient of the equipment in the subsequent process section, which increases the requirements for the structural strength of the equipment. Long-term operation may also cause safety hazards such as equipment deformation and displacement, affecting the stability of the production system. Summary of the Invention

[0013] This invention provides a high-temperature acidic flue gas superheating device that overcomes the shortcomings of the prior art. It can effectively solve the problems of poor water resistance, poor sealing, solidification of coolant connection end, and large overall weight of existing high-temperature acidic flue gas superheating devices.

[0014] The technical solution of this utility model is achieved through the following measures: a high-temperature acidic flue gas superheating device, including a split-type superheating device, which is a sealed superheating device. A flue gas inlet is provided at the top of the split-type superheating device, and a flue gas outlet is provided at the bottom of the split-type superheating device. An anti-corrosion layer is fixedly installed on the upper inner side of the split-type superheating device, and an L-shaped overflow baffle is fixedly installed on the lower inner side of the split-type superheating device. An annular overflow groove is formed between the overflow baffle and the inner wall of the split-type superheating device at the corresponding position. At least one liquid inlet end connected to the annular overflow groove is provided at the lower part of the split-type superheating device.

[0015] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:

[0016] The aforementioned split-type superheating device includes a superheating section and an overflow section. The lower end of the superheating section and the upper end of the overflow section are fixedly installed together. At least two stainless steel support rings are fixedly installed from top to bottom on the inner side of the superheating section. Hanging ribs are evenly distributed between two adjacent stainless steel support rings. An anti-corrosion layer is fixedly connected to the inner side of the stainless steel support rings through the hanging ribs, and the hanging ribs are located inside the anti-corrosion layer. An L-shaped overflow baffle is fixedly installed on the inner side of the overflow section. An annular overflow groove is formed between the overflow baffle and the inner wall of the overflow section. At least one liquid inlet end connected to the annular overflow groove is provided on the overflow section.

[0017] The aforementioned stainless steel support ring is a 316L stainless steel support ring; or / and, the hanging rib is a J-shaped hanging rib.

[0018] The superheated section and the overflow section are fixedly installed together by flanges; or / and, a flue gas inlet is provided at the top of the superheated section and a flue gas outlet is provided at the bottom of the overflow section. A connecting flange is fixedly installed on the flue gas inlet of the superheated section and a connecting flange is fixedly installed on the flue gas outlet of the overflow section; or / and, four liquid inlets connected to the annular overflow groove are symmetrically arranged along the circumference of the overflow section. A connecting flange is fixedly installed on the liquid inlet of the overflow section, and a PTFE liner is fixedly connected to the inside of the connecting flange.

[0019] The aforementioned anti-corrosion layer is an acid- and alkali-resistant high-temperature castable layer; and / or, an inlet pipe is fixedly connected to the inlet end of the superheated section; and / or, an acidic coolant pipe is located on the outside of the overflow section, the inlet end of the overflow section is connected to the acidic coolant pipe via a flexible hose, and a valve is fixedly installed on the acidic coolant pipe.

[0020] The above also includes a flue gas scrubber, which has a flue gas inlet at the top, a flue gas outlet at the top, and a liquid outlet at the bottom. The flue gas inlet and the flue gas outlet of the separate superheater are fixedly installed together through a flue.

[0021] The aforementioned flue gas scrubber has a manhole at the bottom; and / or a spray absorbent inlet at the bottom of the flue, an absorbent pipe is fixedly connected to the spray absorbent inlet of the flue, an upward-opening bent pipe is fixedly connected to the outlet of the absorbent pipe, the bent pipe is located inside the flue, and a nozzle is fixedly installed at the upper end of the bent pipe.

[0022] This utility model has a reasonable and compact structure and is easy to use. By fixing an anti-corrosion layer on the upper inner side of the split-type superheater and fixing an L-shaped overflow baffle on the lower inner side of the split-type superheater, the liquid inlet end of the split-type superheater is connected to the acidic coolant pipeline through a flexible hose. This allows high-temperature acidic flue gas to pass through the split-type superheater without causing corrosion. It features safety and reliability, flexible and easy disassembly, good water resistance and sealing. At the same time, the overall weight is small, reducing the load-bearing coefficient of subsequent equipment, facilitating operation, improving work efficiency, and greatly reducing subsequent installation and maintenance costs. Attached Figure Description

[0023] Appendix Figure 1 This is a process flow diagram of the present invention.

[0024] Appendix Figure 2 This is a side view enlarged structural schematic diagram of the split-type superheating device in this utility model.

[0025] Appendix Figure 3 For the appendix Figure 2 A top view of the overflow section.

[0026] Appendix Figure 4 For the appendix Figure 2 A schematic diagram of the cross-sectional structure of the intermediate superheated section.

[0027] Appendix Figure 5 For the appendix Figure 2 Cross-sectional view of the intermediate superheated section.

[0028] The codes in the attached diagram are as follows: 1 is a split-type superheater, 2 is an anti-corrosion layer, 3 is an overflow baffle, 4 is an annular overflow groove, 5 is a superheater section, 6 is an overflow section, 7 is a stainless steel support ring, 8 is a hanging rod, 9 is a flange, 10 is a flue gas inlet pipeline, 11 is an acidic coolant pipeline, 12 is a flexible hose, 13 is a flue gas scrubber, 14 is a flue, 15 is a manhole, 16 is the inlet end of the spray absorption liquid, and 17 is a valve. Detailed Implementation

[0029] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.

[0030] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0031] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0032] As attached Figure 1 , 2 As shown in Figures 3, 4, and 5, the high-temperature acidic flue gas superheating device includes a split-type superheating device 1, which is a sealed superheating device. The split-type superheating device 1 has a flue gas inlet at the top and a flue gas outlet at the bottom. An anti-corrosion layer 2 is fixedly installed on the upper inner side of the split-type superheating device 1, and an L-shaped overflow baffle 3 is fixedly installed on the lower inner side of the split-type superheating device 1. An annular overflow groove 4 is formed between the overflow baffle 3 and the inner wall of the split-type superheating device 1 at the corresponding position. At least one liquid inlet end connected to the annular overflow groove 4 is provided at the lower part of the split-type superheating device 1. In this way, by fixing the anti-corrosion layer 2 to the upper inner side of the split-type superheater 1 and fixing the L-shaped overflow baffle 3 to the lower inner side of the split-type superheater 1, the high-temperature acidic flue gas can pass through the split-type superheater 1 without causing corrosion. It has the characteristics of safety and reliability, flexible and easy disassembly, good water resistance and sealing. At the same time, the overall weight is small, which reduces the load-bearing coefficient of the equipment in the subsequent section, facilitates operation, improves work efficiency, and greatly reduces the subsequent installation and maintenance costs.

[0033] The above-mentioned high-temperature acidic flue gas superheating device can be further optimized and / or improved according to actual needs:

[0034] As attached Figure 1 , 2 As shown in Figures 3, 4, and 5, the split-type superheating device 1 includes a superheating section 5 and an overflow section 6. The lower end of the superheating section 5 and the upper end of the overflow section 6 are fixedly installed together. At least two stainless steel support rings 7 are fixedly installed from top to bottom on the inner side of the superheating section 5. Hanging ribs 8 are evenly distributed between two adjacent stainless steel support rings 7. An anti-corrosion layer 2 is fixedly connected to the inner side of the stainless steel support rings 7 through the hanging ribs 8. The hanging ribs 8 are located inside the anti-corrosion layer 2. An L-shaped overflow baffle 3 is fixedly installed on the inner side of the overflow section 6. An annular overflow groove 4 is formed between the overflow baffle 3 and the inner wall of the overflow section 6. At least one liquid inlet end is provided on the overflow section 6 that communicates with the annular overflow groove 4. The stainless steel support ring 7 is a known and commonly used material. The split-type superheating device 1 includes a superheating section 5 and an overflow section 6, which facilitates installation and disassembly. In this way, the flue gas will not come into contact with the inner wall of the split-type superheating device 1 when it passes through it, thereby preventing the problem of the superheating protection layer of the superheating section 5 falling off and causing its service life to be short. At the same time, the anti-corrosion layer 2 isolates the high temperature of the flue gas. The overflow baffle 3 has an L-shaped cross-section when viewed from the inside out. During operation, the acidic coolant fills the annular overflow groove 4 and overflows from the annular overflow groove 4, flowing out from the flue gas outlet along with it.

[0035] As attached Figure 4 , 5 As shown, the stainless steel support ring 7 is a 316L stainless steel support ring; and / or the hanging rib 8 is a J-shaped hanging rib. The stainless steel support ring 7 and the hanging rib 8 are designed to ensure that the anti-corrosion layer 2 is firmly fixed to the stainless steel support ring 7.

[0036] As attached Figure 1 , 2 As shown in Figures 3 and 4, the superheated section 5 and the overflow section 6 are fixedly installed together by flanges 9; or / and, a smoke inlet is provided at the top of the superheated section 5, and a smoke outlet is provided at the bottom of the overflow section 6. A connecting flange 9 is fixedly installed on the smoke inlet of the superheated section 5, and a connecting flange 9 is fixedly installed on the smoke outlet of the overflow section 6; or / and, four liquid inlets connected to the annular overflow groove 4 are symmetrically arranged along the circumference of the overflow section 6. A connecting flange 9 is fixedly installed on the liquid inlet of the overflow section 6, and a PTFE liner is fixedly connected to the inside of the connecting flange 9. The fixed installation of each component by flanges 9 prevents leakage during the production process, avoiding energy waste and environmental pollution.

[0037] As attached Figure 1 , 2As shown, the anti-corrosion layer 2 is an acid- and alkali-resistant high-temperature castable layer; and / or, an inlet pipe 10 is fixedly connected to the inlet end of the superheated section 5; and / or, an acidic coolant pipe 11 is located on the outside of the overflow section 6, and the inlet end of the overflow section 6 is connected to the acidic coolant pipe 11 via a hose 12, and a valve 17 is fixedly installed on the acidic coolant pipe 11. The acid- and alkali-resistant high-temperature castable is a known and commonly used material. After the acid- and alkali-resistant high-temperature castable is fully cured, it can be glazed using a high-temperature heat source. The inlet end of the overflow section 6 is connected to the acidic coolant pipe 11 via a hose 12 for easy and flexible disassembly.

[0038] As attached Figure 1 As shown, it also includes a flue gas scrubber 13, which has a flue gas inlet at the top, a flue gas outlet at the top, and a liquid outlet at the bottom. The flue gas inlet of the flue gas scrubber 13 and the flue gas outlet of the split-type superheater 1 are fixedly installed together through a flue 14. The flue gas scrubber 13 is a known and commonly used device, and it facilitates the absorption and treatment of flue gas.

[0039] As attached Figure 1 As shown, a manhole 15 is provided at the lower part of the flue gas scrubber 13; and / or a spray absorbent inlet 16 is provided at the lower part of the flue duct 14. An absorbent pipe is fixedly connected to the spray absorbent inlet 16 of the flue duct 14, and an upward-opening bent pipe is fixedly connected to the outlet end of the absorbent pipe. The bent pipe is located inside the flue duct 14, and a nozzle is fixedly installed at the upper end of the bent pipe. The manhole 15 facilitates regular maintenance and cleaning of the flue gas scrubber 13.

[0040] The present invention has the following features: (1) The flue gas inlet and outlet of the split superheater 1 in the present invention are connected by flanges 9 on both sides; (2) The coolant side of the split superheater 1 in the present invention is connected by flange-type PTFE-lined soft connection; (3) During the manufacturing process, four layers of 100mm wide, 316L stainless steel support rings 7 can be set in the superheater section 5. The support rings are arranged in a “T” shape in the middle of the support rings, and the welding length is 90mm “J” type hanging rods; (4) After the support rings and the “J” type hanging rods in the support rings are manufactured, the inner side is filled with acid and alkali resistant and high temperature resistant castable with a thickness of 100mm and mixed in a certain proportion; (5) After the acid and alkali resistant and high temperature resistant castable is completely cured, a high temperature heat source is used to glaze the castable.

[0041] Advantages of this utility model:

[0042] (1) The high-temperature acid flue gas superheating device of this utility model can achieve stable operation under various working conditions. The device has good water resistance, acid resistance and high temperature resistance, and its service life is extended from the original 0.5 years to 2 years, which greatly saves production costs.

[0043] (2) The overall weight of the high-temperature acidic flue gas superheating device of this utility model is reduced by about 0.6 tons compared with the existing acidic flue gas superheating device, and the load-bearing coefficient of the subsequent flue gas scrubber 13 is significantly reduced, thus extending the stability of the production system.

[0044] (3) The coolant connection method is simplified (using hose 12 for connection), which has the advantages of convenient maintenance and disassembly.

[0045] (4) The high-temperature acidic flue gas superheating device of this utility model has good corrosion resistance and water resistance, light weight, simple connection method, strong sealing, quick maintenance and disassembly, etc. It is suitable for a variety of corrosive liquids, such as acids, alkalis, and salts.

[0046] The above technical features constitute the preferred embodiment of this utility model, which has strong adaptability and the best implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A high-temperature acidic flue gas superheating device, characterized in that... The device includes a split-type superheater, which is a sealed superheater. It has a flue gas inlet at the top and a flue gas outlet at the bottom. An anti-corrosion layer is fixedly installed on the upper inner side of the split-type superheater, and an L-shaped overflow baffle is fixedly installed on the lower inner side of the split-type superheater. An annular overflow groove is formed between the overflow baffle and the inner wall of the split-type superheater at the corresponding position. At least one liquid inlet is provided at the lower part of the split-type superheater, which is connected to the annular overflow groove.

2. The high-temperature acidic flue gas superheating device according to claim 1, characterized in that... The split-type superheater includes a superheating section and an overflow section. The lower end of the superheating section and the upper end of the overflow section are fixedly installed together. At least two stainless steel support rings are fixedly installed from top to bottom on the inner side of the superheating section. Hanging ribs are evenly distributed between two adjacent stainless steel support rings. An anti-corrosion layer is fixedly connected to the inner side of the stainless steel support rings through the hanging ribs, and the hanging ribs are located inside the anti-corrosion layer. An L-shaped overflow baffle is fixedly installed on the inner side of the overflow section. An annular overflow groove is formed between the overflow baffle and the inner wall of the overflow section. At least one liquid inlet end is provided on the overflow section that communicates with the annular overflow groove.

3. The high-temperature acidic flue gas superheating device according to claim 2, characterized in that... The stainless steel support ring is made of 316L stainless steel; or / and the hanging rod is a J-shaped hanging rod.

4. The high-temperature acidic flue gas superheating device according to claim 2 or 3, characterized in that... The superheated section and the overflow section are fixedly installed together by flanges; or / and, a flue gas inlet is provided at the top of the superheated section and a flue gas outlet is provided at the bottom of the overflow section, a connecting flange is fixedly installed on the flue gas inlet of the superheated section and a connecting flange is fixedly installed on the flue gas outlet of the overflow section; or / and, four liquid inlets connected to the annular overflow groove are symmetrically arranged along the circumference of the overflow section, a connecting flange is fixedly installed on the liquid inlet of the overflow section, and a PTFE liner is fixedly connected to the inside of the connecting flange.

5. The high-temperature acidic flue gas superheating device according to claim 2 or 3, characterized in that... The anti-corrosion layer is an acid and alkali resistant and high temperature resistant castable layer; and / or, a flue gas inlet pipeline is fixedly connected to the flue gas inlet end of the superheated section; and / or, an acidic coolant pipeline is located on the outside of the overflow section, the liquid inlet end of the overflow section is connected to the acidic coolant pipeline by a hose, and a valve is fixedly installed on the acidic coolant pipeline.

6. The high-temperature acidic flue gas superheating device according to claim 4, characterized in that... The anti-corrosion layer is an acid and alkali resistant and high temperature resistant castable layer; and / or, a flue gas inlet pipeline is fixedly connected to the flue gas inlet end of the superheated section; and / or, an acidic coolant pipeline is located on the outside of the overflow section, the liquid inlet end of the overflow section is connected to the acidic coolant pipeline by a hose, and a valve is fixedly installed on the acidic coolant pipeline.

7. The high-temperature acidic flue gas superheating device according to claim 1, 2, or 3, characterized in that... It also includes a flue gas scrubber, which has a flue gas inlet at the top, a flue gas outlet at the top, and a liquid outlet at the bottom. The flue gas inlet and the flue gas outlet of the separate superheater are fixedly installed together through a flue.

8. The high-temperature acidic flue gas superheating device according to claim 6, characterized in that... It also includes a flue gas scrubber, which has a flue gas inlet at the top, a flue gas outlet at the top, and a liquid outlet at the bottom. The flue gas inlet and the flue gas outlet of the separate superheater are fixedly installed together through a flue.

9. The high-temperature acidic flue gas superheating device according to claim 7, characterized in that... The flue gas scrubber is provided with a manhole at the bottom; and / or a spray absorbent inlet is provided at the bottom of the flue, an absorbent pipe is fixedly connected to the spray absorbent inlet of the flue, an upward-opening bent pipe is fixedly connected to the outlet of the absorbent pipe, the bent pipe is located inside the flue, and a nozzle is fixedly installed at the upper end of the bent pipe.

10. The high-temperature acidic flue gas superheating device according to claim 8, characterized in that... The flue gas scrubber is provided with a manhole at the bottom; and / or a spray absorbent inlet is provided at the bottom of the flue, an absorbent pipe is fixedly connected to the spray absorbent inlet of the flue, an upward-opening bent pipe is fixedly connected to the outlet of the absorbent pipe, the bent pipe is located inside the flue, and a nozzle is fixedly installed at the upper end of the bent pipe.

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