A white carbon black production waste heat recovery device

Abstract

The utility model discloses a kind of waste heat recovery devices for white carbon black production, comprising: waste heat recovery tank, water storage chamber is opened in the inside of waste heat recovery tank, and heat-absorbing liquid is arranged in the inside of water storage chamber;High-temperature flue gas pipe, high-temperature flue gas pipe is obliquely worn and is provided with water storage chamber of waste heat recovery tank, and high-temperature flue gas pipe is sealed and fixed in the both ends of waste heat recovery tank;The utility model is provided with high-temperature flue gas pipe and circulation heat conduction mechanism, hollow heat conduction main pipe, vice heat conduction pipe, water supply pipeline, outlet pipe and water storage chamber can form circulating heat-absorbing flow channel, so low-temperature heat-absorbing liquid from water supply pipeline into hollow heat conduction main pipe can be evenly shunted to each vice heat conduction pipe through communicating port, the structure of this hollow heat conduction main pipe and multiple vice heat conduction pipes cooperation substantially increases the contact area of heat-absorbing liquid and high-temperature flue gas in high-temperature flue gas pipe, cooperate high-temperature flue gas pipe itself and the heat transfer path and effect of heat-absorbing liquid can guarantee good waste heat recovery efficiency.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, specifically a waste heat recovery device for the production of silica. Background Technology

[0002] Silica, as an important inorganic non-metallic material, is widely used in rubber, plastics, coatings, adhesives, cosmetics, and many other fields. Currently, the mainstream industrial production processes for silica include the gas-phase method and the precipitation method. Both processes require high-temperature reaction processes: for example, in the gas-phase method, the raw materials react in a high-temperature furnace above 1000℃ to produce silica, which generates a large amount of high-temperature flue gas at 500-800℃; in the precipitation method, sodium silicate reacts with acidic substances and then undergoes high-temperature drying (such as spray drying), which also emits flue gas containing waste heat at 300-600℃. If these high-temperature flue gases are directly emitted, it will result in a large waste of heat energy. Therefore, the recovery and utilization of waste heat from the flue gas in the silica production process has become an indispensable link in the industry to reduce energy consumption, improve economic efficiency, and achieve environmental compliance.

[0003] Currently, the waste heat recovery devices commonly used in the industry for precipitated silica production often employ a waste heat recovery box that stores heat-absorbing liquids such as water or heat transfer oil. High-temperature flue gas pipes pass through the waste heat recovery box and come into contact with the heat-absorbing liquid. The waste heat in the flue gas is transferred to the heat-absorbing liquid through heat transfer through the pipe wall. The heated heat-absorbing liquid is then used for secondary utilization such as heating, preheating raw materials, or power generation.

[0004] However, existing waste heat recovery devices mainly rely on a single path between the high-temperature flue gas pipe wall and the heat-absorbing liquid for heat exchange, or only have a single or a few heat-conducting pipes inside the flue gas pipe in contact with the flue gas. This results in a limited contact area between the heat-absorbing liquid and the high-temperature flue gas, and a short and insufficient heat exchange path. Furthermore, the high-temperature flue gas pipe passes through a localized area of ​​the heat-absorbing liquid in the waste heat recovery box, causing the heat-absorbing liquid around the flue gas pipe to heat up rapidly, while the bottom of the water storage chamber and the area far from the flue gas pipe remain at a low temperature. This localized overheating reduces the heat absorption capacity of the heat-absorbing liquid. In addition, the flue gas from silica production carries trace amounts of unreacted silicates, dust, and other impurities. After long-term operation, these impurities tend to deposit on the inner wall of the high-temperature flue gas pipe and the surface of the internal heat-conducting structure, forming scale. This scale layer significantly increases thermal resistance, leading to a continuous decrease in heat transfer efficiency between the pipe wall and the medium, and between the heat-conducting pipe and the flue gas. Therefore, a waste heat recovery device for silica production is needed to solve the problems existing in the current technology. Utility Model Content

[0005] The purpose of this invention is to provide a waste heat recovery device for silica production to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a waste heat recovery device for silica production, comprising:

[0007] Waste heat recovery box, wherein the waste heat recovery box has a water storage chamber inside, and the water storage chamber is filled with heat-absorbing liquid;

[0008] A high-temperature flue gas pipe is inclinedly inserted into the water storage chamber of the waste heat recovery box. The high-temperature flue gas pipe is sealed and fixed in both ends of the waste heat recovery box. The high-temperature flue gas pipe is used to transport the high-temperature flue gas generated during the production of silica.

[0009] A circulating heat conduction mechanism is installed inside the high-temperature flue gas pipe, and the circulating heat conduction mechanism is used to form a heat-absorbing liquid circulation channel between the bottom of the water storage chamber and the high-temperature flue gas pipe;

[0010] A flushing mechanism is installed inside the high-temperature flue gas pipe, and the flushing mechanism is used to flush the high-temperature flue gas pipe and the circulating heat conduction mechanism.

[0011] Preferably, the circulating heat conduction mechanism includes a heat conduction component, which is suspended in the inner cavity of the high-temperature flue gas pipe. A water supply pipe is fixed to the lower end of the heat conduction component, and the water supply pipe passes through and is fixed inside the high-temperature flue gas pipe.

[0012] Preferably, a circulating water pump is fixed to the inner bottom wall of the waste heat recovery box, the other end of the water supply pipe is fixed to the outlet end of the circulating water pump, and an inlet pipe is provided at the inlet end of the circulating water pump.

[0013] Preferably, the lower end of the heat-conducting component is fixed with a water outlet pipe, and the lower end of the water outlet pipe extends to the bottom area of ​​the water storage chamber.

[0014] Preferably, the heat-conducting component includes a hollow heat-conducting main pipe and a secondary heat-conducting pipe. The hollow heat-conducting main pipe is connected and fixed to one end of the water supply pipe and the water outlet pipe, and the secondary heat-conducting pipe is circumferentially fixed to the side surface of the hollow heat-conducting main pipe.

[0015] Preferably, a communication port is provided at the connection between the secondary heat-conducting pipe and the hollow heat-conducting main pipe, and the hollow heat-conducting main pipe is connected to the secondary heat-conducting pipe.

[0016] Preferably, the rinsing mechanism includes a rinsing sleeve, which is fitted and fixed to the outside of the hollow heat-conducting main pipe.

[0017] Preferably, the surface of the rinsing sleeve is provided with rinsing spray holes, and a water pipe is fixed at the upper end of the rinsing sleeve.

[0018] Preferably, the other end of the water pipe is fixed to the water supply pipe, and a shut-off valve is provided at the upper part of the water pipe.

[0019] Preferably, the other end of the water pipe is connected to the inner cavity of the flushing sleeve after passing through a high-temperature flue gas pipe.

[0020] This utility model provides a waste heat recovery device for silica production, which has the following advantages compared with the prior art:

[0021] Through the high-temperature flue gas pipe and the circulating heat conduction mechanism, the hollow heat conduction main pipe, auxiliary heat conduction pipe, water supply pipe, water outlet pipe and water storage chamber can form a circulating heat absorption channel. Therefore, the low-temperature heat absorption liquid entering the hollow heat conduction main pipe from the water supply pipe will be evenly distributed to each auxiliary heat conduction pipe through the connecting port. This structure of hollow heat conduction main pipe and multiple auxiliary heat conduction pipes greatly increases the contact area between the heat absorption liquid and the high-temperature flue gas in the high-temperature flue gas pipe. Combined with the heat transfer path and effect of the high-temperature flue gas pipe itself and the heat absorption liquid, good waste heat recovery efficiency can be guaranteed.

[0022] The high-temperature flue gas pipe is arranged in the upper middle part of the water storage chamber. The inlet pipe draws in the low-temperature heat-absorbing liquid at the bottom of the water storage chamber, while the outlet pipe returns the heat-absorbing liquid with increased temperature to the bottom area of ​​the water storage chamber. This can conduct heat to the heat-absorbing liquid at different heights inside the water storage chamber, thereby improving the situation of high local temperature of the heat-absorbing liquid in the area through which the high-temperature flue gas pipe passes.

[0023] Through the established circulating heat conduction mechanism and flushing mechanism, the liquid in the water supply pipe (which can be selected as heat-absorbing liquid or cleaning water with added weak alkaline detergent depending on the type of impurities) enters the inner cavity of the flushing sleeve through the water pipe and is sprayed out evenly at high pressure from the flushing nozzles to flush the deposited impurities on the inner wall of the high-temperature flue gas pipe and the surface of the heat conduction components. The impurities are discharged from the exhaust end of the high-temperature flue gas pipe along with the flushing liquid for subsequent treatment. This process can be completed without disassembling the device, ensuring that the heat conduction components and the high-temperature flue gas pipe always maintain a good heat conduction state, ensuring the long-term stable and efficient operation of the device, and reducing downtime caused by disassembly and maintenance. Attached Figure Description

[0024] Figure 1 This is a three-dimensional view of the overall structure of this utility model;

[0025] Figure 2 This is a three-dimensional cross-sectional view of the waste heat recovery box of this utility model;

[0026] Figure 3 This is a three-dimensional view of the rinsing mechanism of this utility model;

[0027] Figure 4 This is a three-dimensional view of the heat-conducting component structure of this utility model;

[0028] Figure 5 This is a three-dimensional view of the water pipe structure of this utility model;

[0029] Figure 6 This is a three-dimensional view of the hollow heat-conducting main pipe structure of this utility model;

[0030] Figure 7 This is a three-dimensional view of the secondary heat pipe structure of this utility model.

[0031] In the diagram: 1. Waste heat recovery box; 2. High-temperature flue gas pipe; 3. Water storage chamber; 4. Circulating heat conduction mechanism; 5. Flushing mechanism; 6. Heat conduction component; 7. Water outlet pipe; 8. Circulating water pump; 9. Water inlet pipe; 10. Hollow heat conduction main pipe; 11. Secondary heat conduction pipe; 12. Connecting port; 13. Flushing sleeve; 14. Water supply pipe; 15. Shut-off valve; 16. Water supply pipe. Detailed Implementation

[0032] 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.

[0033] Please see Figure 1-7 This utility model provides a waste heat recovery device for silica production, comprising:

[0034] Waste heat recovery box 1, with a water storage chamber 3 inside the waste heat recovery box 1, and heat absorption liquid is installed inside the water storage chamber 3;

[0035] High-temperature flue gas pipe 2 is inclinedly inserted through the water storage chamber 3 of the waste heat recovery box 1. The high-temperature flue gas pipe 2 is sealed and fixed in the two ends of the waste heat recovery box 1. The high-temperature flue gas pipe 2 is used to transport the high-temperature flue gas generated during the production of silica.

[0036] A circulating heat conduction mechanism 4 is installed inside the high-temperature flue gas pipe 2. The circulating heat conduction mechanism 4 is used to form a heat-absorbing liquid circulation channel between the bottom of the water storage chamber 3 and the high-temperature flue gas pipe 2. The circulating heat conduction mechanism 4 includes a heat conduction component 6, which is suspended in the inner cavity of the high-temperature flue gas pipe 2. A water supply pipe 16 is fixed to the lower end of the heat conduction component 6. The water supply pipe 16 passes through and is fixed inside the high-temperature flue gas pipe 2. The heat conduction component 6 includes a hollow heat conduction main pipe 10 and a secondary heat conduction pipe 11. The hollow heat conduction main pipe 10 is connected and fixed to one end of the water supply pipe 16 and the water outlet pipe 7. The secondary heat conduction pipe 11 is circumferentially fixed to the side surface of the hollow heat conduction main pipe 10. A communication port 12 is opened at the connection between the secondary heat conduction pipe 11 and the hollow heat conduction main pipe 10, and the hollow heat conduction main pipe 10 and the secondary heat conduction pipe 11 are connected.

[0037] The hollow heat-conducting main pipe 10, the auxiliary heat-conducting pipe 11, the water supply pipe 16, the water outlet pipe 7, and the water storage chamber 3 can form a circulating heat-absorbing channel. Therefore, the low-temperature heat-absorbing liquid entering the hollow heat-conducting main pipe 10 from the water supply pipe 16 will be evenly distributed to each of the auxiliary heat-conducting pipes 11 through the connecting port 12. This structure of the hollow heat-conducting main pipe 10 and multiple auxiliary heat-conducting pipes 11 greatly increases the contact area between the heat-absorbing liquid and the high-temperature flue gas in the high-temperature flue gas pipe 2. Combined with the heat transfer path and effect of the high-temperature flue gas pipe 2 itself and the heat-absorbing liquid, good waste heat recovery efficiency can be guaranteed.

[0038] The flushing mechanism 5 is located inside the high-temperature flue gas pipe 2. The flushing mechanism 5 is used to flush the high-temperature flue gas pipe 2 and the circulating heat conduction mechanism 4. The flushing mechanism 5 includes a flushing sleeve 13, which is sleeved and fixed outside the hollow heat conduction main pipe 10. The surface of the flushing sleeve 13 is provided with flushing spray holes. A water pipe 14 is fixed at the upper end of the flushing sleeve 13. The other end of the water pipe 14 is fixed on the water supply pipe 16. A shut-off valve 15 is provided at the upper part of the water pipe 14. The other end of the water pipe 14 passes through the high-temperature flue gas pipe 2 and connects to the inner cavity of the flushing sleeve 13.

[0039] The liquid in the water supply pipe 16 (which can be heat-absorbing liquid or cleaning water with added weak alkaline detergent, depending on the type of impurities) enters the inner cavity of the flushing sleeve 13 through the water pipe 14 and is sprayed out evenly at high pressure from the flushing nozzles to flush the deposited impurities on the inner wall of the high-temperature flue gas pipe 2 and the surface of the heat-conducting component 6. The impurities are discharged from the exhaust end of the high-temperature flue gas pipe 2 along with the flushing liquid and then processed. This process can be completed without disassembling the device, ensuring that the heat-conducting component 6 and the high-temperature flue gas pipe 2 always maintain a good thermal conductivity, ensuring long-term stable and efficient operation of the device, and reducing downtime caused by disassembly and maintenance.

[0040] It is worth noting that a circulating water pump 8 is fixed to the inner bottom wall of the waste heat recovery box 1, the other end of the water supply pipe 16 is fixed to the outlet end of the circulating water pump 8, the inlet end of the circulating water pump 8 is provided with an inlet pipe 9, the lower end of the heat conduction component 6 is fixed with an outlet pipe 7, and the lower end of the outlet pipe 7 extends to the bottom area of ​​the water storage chamber 3.

[0041] The high-temperature flue gas pipe 2 is arranged in the upper middle part of the water storage chamber 3. The inlet pipe 9 draws in the low-temperature heat-absorbing liquid at the bottom of the water storage chamber 3, while the outlet pipe 7 returns the heat-absorbing liquid with increased temperature to the bottom part of the water storage chamber 3. This can conduct heat to the heat-absorbing liquid at different heights inside the water storage chamber 3, so as to improve the situation of high local temperature of the heat-absorbing liquid in the area through which the high-temperature flue gas pipe 2 passes in the water storage chamber 3.

[0042] After the calcination and drying processes in the production of silica using the precipitation or fumed silica method, high-temperature flue gas with a temperature of 300-500℃ and carrying a large amount of waste heat is generated. At this time, a waste heat recovery device for silica production can be put into operation to realize the resource utilization of waste heat. The waste heat recovery process includes the following steps:

[0043] During the preparation stage, the upper end of the high-temperature flue gas pipe 2 is connected and fixed to the exhaust port of the silica production equipment. In this way, the high-temperature flue gas generated in the production process will enter the high-temperature flue gas pipe 2. The high-temperature flue gas pipe 2 is inclined through the water storage chamber 3 of the waste heat recovery box 1 and is fixed in the two ports of the waste heat recovery box 1 by a sealing structure.

[0044] When used for heat conduction, a heat-absorbing liquid with high specific heat capacity and good thermal conductivity, such as deionized water or a special heat-absorbing liquid, is pre-filled into the water storage chamber 3. When high-temperature flue gas passes through the high-temperature flue gas pipe 2, heat is transferred to the high-temperature flue gas pipe 2. At this time, the inclined setting of the high-temperature flue gas pipe 2 prolongs the residence time of the high-temperature flue gas in the pipe, allowing the heat on the surface of the high-temperature flue gas pipe 2 to be transferred to the low-temperature heat-absorbing liquid to achieve waste heat recovery. During use, the circulating water pump 8 installed on the bottom wall of the waste heat recovery box 1 is started. When the circulating water pump 8 is working, it will transport the low-temperature heat-absorbing liquid at the bottom of the water storage chamber 3 to the water supply pipe 16. Since the water supply pipe 16 is connected to the heat-conducting component 6, the low-temperature heat-absorbing liquid can smoothly enter the heat-conducting component 6 in the inner cavity of the high-temperature flue gas pipe 2 along the water supply pipe 16. The heat-conducting component 6 consists of a middle The system consists of a hollow heat-conducting main pipe 10 and multiple auxiliary heat-conducting pipes 11 circumferentially and uniformly fixed on the side surface of the hollow heat-conducting main pipe 10. One end of the hollow heat-conducting main pipe 10 is connected and fixed to the water supply pipe 16, and the other end is connected and fixed to the water outlet pipe 7. This allows the hollow heat-conducting main pipe 10, auxiliary heat-conducting pipes 11, water supply pipe 16, water outlet pipe 7, and water storage chamber 3 to form a circulating heat-absorbing channel. Therefore, the low-temperature heat-absorbing liquid entering the hollow heat-conducting main pipe 10 from the water supply pipe 16 will be evenly distributed to each auxiliary heat-conducting pipe 11 through the connecting port 12. This structure of the hollow heat-conducting main pipe 10 and multiple auxiliary heat-conducting pipes 11 significantly increases the contact area between the heat-absorbing liquid and the high-temperature flue gas in the high-temperature flue gas pipe 2. Combined with the heat transfer path and effect between the high-temperature flue gas pipe 2 and the heat-absorbing liquid, good waste heat recovery efficiency can be guaranteed.

[0045] After the heat absorber absorbs heat from the high-temperature flue gas, the temperature of the heat absorber rises. This high-temperature heat absorber flows along the outlet pipe 7. Since the lower end of the outlet pipe 7 extends to the bottom area of ​​the water storage chamber 3, the high-temperature heat absorber eventually flows back to the bottom area of ​​the water storage chamber 3. The high-temperature flue gas pipe 2 is arranged in the upper middle area of ​​the water storage chamber 3. The inlet pipe 9 draws in the low-temperature heat absorber at the bottom of the water storage chamber 3, while the outlet pipe 7 returns the heat absorber with increased temperature to the bottom area of ​​the water storage chamber 3. This can conduct heat to the heat absorber at different heights inside the water storage chamber 3, thereby improving the situation of high local temperature of the heat absorber in the area through which the high-temperature flue gas pipe 2 passes in the water storage chamber 3.

[0046] After the device has been running continuously for a period of time, the silica dust and acidic impurities in the high-temperature flue gas are prone to deposit on the inner wall of the high-temperature flue gas pipe 2 and on the surface of the hollow heat-conducting main pipe 10 and the auxiliary heat-conducting pipe 11 of the heat-conducting component 6. If not cleaned in time, they will form a heat insulation layer that hinders heat transfer and reduces the waste heat recovery efficiency. At this time, the flushing mechanism 5 can be started for cleaning. The flushing sleeve 13 in the flushing mechanism 5 is sleeved and fixed to the outside of the hollow heat-conducting main pipe 10. The surface of the flushing sleeve 13 is provided with uniform spray holes. A water pipe 14 is fixedly connected to its upper end. The other end of the water pipe 14 passes through the high-temperature flue gas pipe 2 and is fixed to the water supply pipe 16. The upper part of the water pipe 14 is located near the water supply pipe 16. The device is equipped with a shut-off valve 15. After the shut-off valve 15 is opened, the liquid in the water supply pipe 16 (which can be heat-absorbing liquid or cleaning water with added weak alkaline detergent depending on the type of impurities) will enter the inner cavity of the flushing sleeve 13 through the water pipe 14 and be sprayed out evenly at high pressure from the flushing nozzle to flush the deposited impurities on the inner wall of the high-temperature flue gas pipe 2 and the surface of the heat-conducting component 6. The impurities are discharged from the exhaust end of the high-temperature flue gas pipe 2 along with the flushing liquid and then processed. This process can be completed without disassembling the device, ensuring that the heat-conducting component 6 and the high-temperature flue gas pipe 2 always maintain a good heat conduction state, ensuring the long-term stable and efficient operation of the device, and reducing downtime caused by disassembly and maintenance.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Although embodiments of this utility model have been shown and described, this does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model. Regarding the embodiments of this utility model, those skilled in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery device for silica production, characterized in that, include: Waste heat recovery box (1), the waste heat recovery box (1) has a water storage chamber (3) inside, and the water storage chamber (3) is filled with heat-absorbing liquid; High-temperature flue gas pipe (2), the high-temperature flue gas pipe (2) is inclined through the water storage chamber (3) of the waste heat recovery box (1), the high-temperature flue gas pipe (2) is sealed and fixed in the two ends of the waste heat recovery box (1), and the high-temperature flue gas pipe (2) is used to transport the high-temperature flue gas generated during the production of silica. A circulating heat conduction mechanism (4) is installed inside the high-temperature flue gas pipe (2). The circulating heat conduction mechanism (4) is used to form a heat-absorbing liquid circulation channel between the bottom of the water storage chamber (3) and the high-temperature flue gas pipe (2). A flushing mechanism (5) is provided inside the high-temperature flue gas pipe (2) and is used to flush the high-temperature flue gas pipe (2) and the circulating heat conduction mechanism (4).

2. The waste heat recovery device for silica production according to claim 1, characterized in that: The circulating heat conduction mechanism (4) includes a heat conduction component (6), which is suspended in the inner cavity of the high-temperature flue gas pipe (2). A water supply pipe (16) is fixed at the lower end of the heat conduction component (6), and the water supply pipe (16) passes through and is fixed inside the high-temperature flue gas pipe (2).

3. The waste heat recovery device for silica production according to claim 2, characterized in that: The bottom wall of the waste heat recovery box (1) is fixed with a circulating water pump (8), the other end of the water supply pipe (16) is fixed to the outlet end of the circulating water pump (8), and the inlet end of the circulating water pump (8) is provided with an inlet pipe (9).

4. The waste heat recovery device for silica production according to claim 3, characterized in that: The lower end of the heat-conducting component (6) is fixed with a water outlet pipe (7), and the lower end of the water outlet pipe (7) extends to the bottom area of ​​the water storage chamber (3).

5. A waste heat recovery device for silica production according to claim 4, characterized in that: The heat-conducting component (6) includes a hollow heat-conducting main pipe (10) and a secondary heat-conducting pipe (11). The hollow heat-conducting main pipe (10) is connected and fixed at one end of the water supply pipe (16) and the water outlet pipe (7). The secondary heat-conducting pipe (11) is circumferentially fixed on the side surface of the hollow heat-conducting main pipe (10).

6. A waste heat recovery device for silica production according to claim 5, characterized in that: A connecting port (12) is provided at the connection between the secondary heat-conducting pipe (11) and the hollow heat-conducting main pipe (10), and the hollow heat-conducting main pipe (10) is connected to the secondary heat-conducting pipe (11).

7. A waste heat recovery device for silica production according to claim 1, characterized in that: The rinsing mechanism (5) includes a rinsing sleeve (13), which is fitted and fixed to the outside of the hollow heat-conducting main pipe (10).

8. A waste heat recovery device for silica production according to claim 7, characterized in that: The surface of the flushing sleeve (13) is provided with a flushing spray hole, and a water pipe (14) is fixed at the upper end of the flushing sleeve (13).

9. A waste heat recovery device for silica production according to claim 8, characterized in that: The other end of the water pipe (14) is fixed to the water supply pipe (16), and a shut-off valve (15) is provided on the upper part of the water pipe (14).

10. A waste heat recovery device for silica production according to claim 9, characterized in that: The other end of the water pipe (14) is connected to the inner cavity of the flushing sleeve (13) after passing through the high-temperature flue gas pipe (2).

Images