Steam generator tube plate protection device and steam generator

Abstract

The invention provides a steam generator tube plate protection device and a steam generator. The steam generator tube plate protection device comprises a heat insulation layer and a water cooling device, and the heat insulation layer is arranged on the outer surface of a tube plate of the steam generator and used for isolating a tail gas output end; and the water cooling device is partially arranged in the heat insulation layer and is close to the tube plate. According to the steam generator tube plate protection device and the steam generator, the heat insulation layer is arranged on the outer surface of the tube plate, the water cooling device is arranged in the heat insulation layer, the heat insulation performance of the heat insulation layer is utilized, direct heat radiation of high-temperature tail gas to the tube plate is effectively blocked, the temperature of the tube plate is reduced, and the heat insulation layer can also play a heat buffering role; and in the heat insulation layer, a water cooling device is arranged to carry out efficient heat exchange with the tube plate, so that the temperature of the tube plate is obviously reduced, thermal stress is reduced, and equipment is protected from high-temperature damage.

Description

Technical Field

[0001] This application relates to the technical field of dry reforming conversion processes, and particularly to a steam generator tube sheet protection device and a steam generator. Background Art

[0002] A steam generator is an important waste heat recovery device for tail gas, playing a key role in the dry reforming conversion process. It can recover waste heat, provide necessary steam, control the reaction temperature, and improve the overall process efficiency.

[0003] Dry reforming refers to the process of reacting carbon dioxide with methane to produce syngas (mainly composed of carbon monoxide and hydrogen). The dry reforming reaction is a high-temperature endothermic reaction that generates a large amount of waste heat. The steam generator can recover this waste heat and convert it into steam for preheating the feed gas, maintaining the reaction temperature, or being used in other processes, thereby achieving effective recycling of energy and reducing the overall energy consumption.

[0004] When the gas temperature at the inlet of the steam generator reaches 900 °C or above, there is a large temperature difference between the high-temperature gas and the tube sheet and the heat exchange tube joint, which will cause a large temperature gradient inside the material, resulting in thermal stress. Especially, repeated temperature changes will cause thermal fatigue of the material, leading to a decline in material performance, equipment failure, damage, or plant shutdown, seriously affecting the long-term operation of the plant. The above problems need to be solved urgently. Summary of the Invention

[0005] The purpose of the embodiments of this application is to provide a steam generator tube sheet protection device and a steam generator to protect the tube sheet from being damaged by thermal stress.

[0006] To solve the above technical problems, the following technical solutions are provided in the embodiments of this application:

[0007] In the first aspect of this application, a steam generator tube sheet protection device is provided. The device includes: a heat insulation layer and a water cooling device;

[0008] The heat insulation layer is arranged on the outer surface of the tube sheet of the steam generator for isolating the tail gas outlet;

[0009] The water cooling device is partially arranged in the heat insulation layer and is adjacent to the tube sheet.

[0010] In some embodiments of the first aspect of this application, the water cooling device includes: a water cooling pipe, a water supply pipe, a water outlet pipe, and a water supply component;

[0011] The water cooling pipe is arranged in the heat insulation layer; the water supply pipe is connected to the water cooling pipe and extends outside the heat insulation layer; the water outlet pipe is connected to the water cooling pipe and extends outside the heat insulation layer; the water supply component is connected to the water supply pipe for supplying water to the water cooling device.

[0012] In some embodiments of the first aspect of the present application, it further includes a support structure, one end of the support structure is fixedly connected to the water-cooling pipe, and the other end is fixedly connected to the tube sheet.

[0013] In some embodiments of the first aspect of the present application, it further includes a backing plate, the backing plate is arranged in the heat insulation layer, the backing plate includes a first surface and a second surface arranged opposite to each other, the water-cooling pipe is arranged on the first surface, and the backing plate contacts the outer surface of the tube sheet by using the second surface.

[0014] In some embodiments of the first aspect of the present application, the cross-sectional shape of the water-cooling pipe is rectangular.

[0015] In some embodiments of the first aspect of the present application, it further includes an intake pipe, the intake pipe is arranged in the heat insulation layer, one end is communicated with the tail gas output end, and the other end passes through the tube sheet and extends into the steam generator.

[0016] In some embodiments of the first aspect of the present application, the intake pipe includes a first pipe section and a second pipe section arranged adjacent to each other, the first pipe section is placed in the heat insulation layer, and the second pipe section extends into the steam generator;

[0017] Wherein, the wall thickness of the first pipe section is greater than the wall thickness of the second pipe section, and a first protective member is arranged between the end of the first pipe section close to the second pipe section and the tube sheet.

[0018] In some embodiments of the first aspect of the present application, it further includes a sleeve, one end of the sleeve is fixedly arranged at the air inlet of the tube sheet, the other end extends into the steam generator, and the second pipe section extends into the sleeve and is coaxially arranged;

[0019] Wherein, the outer diameter of the second pipe section is smaller than the inner diameter of the sleeve, and a second protective member is arranged on the outer side of the second pipe section.

[0020] In some embodiments of the first aspect of the present application, both the first protective member and the second protective member are made of ceramic fiber material.

[0021] The second aspect of the present application provides a steam generator, including: a steam generator tube sheet protection device, and the steam generator tube sheet protection device includes:

[0022] A tube sheet, arranged on any end face of the steam generator;

[0023] A heat insulation layer, the heat insulation layer is arranged on the end face of the tube sheet and covers the tube sheet;

[0024] A water cooling device, part of the water cooling device is arranged in the heat insulation layer and is adjacent to the tube sheet.

[0025] Compared with the prior art, the steam generator tube sheet protection device provided by the present application, by arranging a heat insulation layer on the outer surface of the tube sheet and arranging a water cooling device in the heat insulation layer, utilizes the heat insulation performance of the heat insulation layer to effectively block the direct thermal radiation of high-temperature exhaust gas to the tube sheet, reduce the temperature of the tube sheet, and the heat insulation layer can also play a role of heat buffering to reduce the influence of temperature fluctuations on the tube sheet. In the heat insulation layer, a water cooling device is arranged to carry out efficient heat exchange with the tube sheet, thereby significantly reducing the temperature of the tube sheet, reducing thermal stress, and protecting the equipment from high-temperature damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By referring to the drawings and reading the following detailed description, the above and other objects, features, and advantages of the exemplary embodiments of the present application will become readily understandable. In the drawings, several embodiments of the present application are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0027] Figure 1 Schematically shows an assembly diagram of the steam generator tube sheet protection device and the steam generator;

[0028] Figure 2 Schematically shows a partial structural diagram of the steam generator tube sheet protection device;

[0029] Figure 3 Schematically shows a perspective view of the side view angle of the steam generator tube sheet protection device.

[0030] Description of the reference numerals in the drawings:

[0031] 00. Tube sheet; 10. Heat insulation layer; 20. Exhaust gas output end; 30. Water cooling device; 31. Water cooling pipeline; 32. Water supply pipe; 33. Water outlet pipe; 34. Water supply assembly; 40. Intake pipe; 41. First pipe section; 42. Second pipe section; 50. First protective member; 60. Sleeve; 70. Second protective member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following will describe in more detail the exemplary embodiments disclosed in the present application with reference to the drawings. Although the exemplary embodiments disclosed in the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be fully conveyed to those skilled in the art.

[0033] It should be noted that unless otherwise specified, the technical terms or scientific terms used in the present application should have the ordinary meaning understood by those skilled in the art to which the present application belongs.

[0034] Dry reforming is an important chemical reaction process mainly used to convert carbon dioxide and methane into syngas (mainly composed of carbon monoxide and hydrogen). This process not only helps reduce greenhouse gas emissions but also produces valuable chemicals and fuels. It mainly includes the following processes: raw material pretreatment - raw material mixing - preheating - dry reforming reaction - product separation - product purification - product storage and transportation - tail gas treatment.

[0035] Among them, in the tail gas treatment process, a steam generator is used to convert the high-temperature waste heat in the tail gas into steam through heat exchange for preheating the raw material gas. In some cases, the recovered waste heat can be used in a cogeneration system to generate electricity and heat energy, further improving the energy utilization efficiency.

[0036] When the tail gas enters the steam generator, when the gas temperature at the inlet of the steam generator reaches 900 °C or above, there is a large temperature difference between the high-temperature gas and the tube sheet and the heat exchange tube joint. At this time, the temperature of the high-temperature gas is relatively high, while the tube sheet and the heat exchange tube joint are made of metal materials, resulting in the temperature of the material itself being much lower than that of the high-temperature gas, which will cause a large temperature gradient inside the material, thereby generating thermal stress. Also, because the heat exchange tube and the tube sheet are welded together, the thermal stress will cause gaps or even welding failures at the weld points, resulting in leakage of water or steam inside the steam generator and causing equipment damage. To solve the above problems, the present disclosure proposes a steam generator tube sheet protection device and a steam generator.

[0037] Embodiment 1

[0038] Reference appendix Figures 1-3 In Embodiment 1 of the present application, a steam generator tube sheet protection device is proposed. The device includes: a heat insulation layer 10 and a water cooling device 30;

[0039] The heat insulation layer 10 is arranged on the outer surface of the tube sheet 00 of the steam generator for isolating the tail gas output end 20;

[0040] The water cooling device 30 is partially arranged in the heat insulation layer 10 and is adjacent to the tube sheet 00.

[0041] Specifically, the heat insulation layer 10 plays a role in isolating heat, preventing the high-temperature gas at the tail gas output end 20 from directly acting on the metal tube sheet 00. The heat insulation layer 10 can be made of high-temperature resistant insulation materials, such as heavy refractory materials including: high-alumina bricks, magnesite bricks, silica bricks, corundum bricks, etc.; and lightweight insulation materials, including: lightweight refractory bricks, ceramic fibers, microporous calcium silicate, etc. The above materials can effectively block the direct thermal radiation of the high-temperature tail gas to the tube sheet 00, thereby reducing the temperature of the tube sheet 00. Among them, the heat insulation layer 10 can be fixed on the outer surface of the tube sheet 00 through high-temperature resistant metal anchor bolts or ceramic anchor bolts to ensure its stability in a high-temperature environment, and the area of the heat insulation layer 10 is not less than the area of the tube sheet 00 to achieve an effective heat insulation effect.

[0042] Part of the water cooling device 30 is disposed in the heat insulation layer 10 and adjacent to the tube sheet 00 to ensure the cooling effect. The water cooling device 30 includes water cooling pipes 31. Laying the water cooling pipes 31 in the heat insulation layer 10 can not only cool the heat insulation layer 10 to a certain extent, but also, when the cooling water is arranged adjacent to the tube sheet 00 and absorbs heat, the heat is discharged, thereby reducing the temperature of the tube sheet 00, further reducing the thermal stress of the tube sheet 00, and avoiding the generation of gaps at the welding points or connection parts due to its deformation, so as to prevent the water and steam inside the steam generator from leaking through the gaps.

[0043] Among them, the water cooling pipes 31 can be made of high-temperature resistant metal materials such as stainless steel or copper alloy. These pipes are arranged in a grid pattern or can also be arranged in parallel inside the heat insulation layer 10, aiming to increase the arrangement area in the heat insulation layer 10 to achieve uniform cooling.

[0044] By providing the heat insulation layer 10 on the outer surface of the tube sheet 00 and arranging the water cooling device 30 in the heat insulation layer 10, using the heat insulation performance of the heat insulation layer 10, the direct thermal radiation of the high-temperature exhaust gas to the tube sheet 00 is effectively blocked, the temperature of the tube sheet 00 is reduced, the heat insulation layer 10 can also play a role of heat buffering, reducing the influence of temperature fluctuations on the tube sheet 00, and prolonging the service life of the tube sheet 00. Then, by arranging the water cooling pipes 31 uniformly and densely in the heat insulation layer 10 and flowing in the cooling water, efficient heat exchange occurs between the cooling water inside the water cooling pipes 31 and the tube sheet 00, thereby significantly reducing the temperature of the tube sheet 00, reducing the thermal stress, protecting the equipment from high-temperature damage, and the cooling water absorbs the heat and then discharges from the heat insulation layer 10. The uniform arrangement can reduce the risk of local overheating, and the dense arrangement can improve the cooling effect.

[0045] A temperature control system can also be added to the water cooling device 30, including a thermometer. The thermometer is used to detect the temperature of the water flowing out of the heat insulation layer 10 in real time. If the detected water temperature is too high, the water temperature can be reduced by increasing the cooling water flow or raising the initial temperature of the cold water.

[0046] Through the double protection of the heat insulation layer 10 and the water cooling device 30, the steam generator tube sheet 00 protection device effectively reduces the temperature of the tube sheet 00, reduces the thermal stress of the tube sheet 00, improves the sealing performance, safety and thermal efficiency of the equipment, prolongs the service life of the equipment, and at the same time reduces the maintenance cost and energy consumption.

[0047] Furthermore, in some embodiments, the water cooling device 30 includes: water cooling pipes 31, a water supply pipe 32, a water outlet pipe 33, and a water supply component 34

[0048] The water-cooling pipe 31 is arranged in the heat insulation layer 10. The water supply pipe 32 is connected to the water-cooling pipe 31 and extends outside the heat insulation layer 10. The water outlet pipe 33 is connected to the water-cooling pipe 31 and extends outside the heat insulation layer 10. The water supply assembly 34 is connected to the water supply pipe 32 and is used to supply water to the water-cooling device.

[0049] Specifically, in order to achieve the cooling effect of the water-cooling device 30, in the technical solution adopted in this application, the water-cooling pipe 31 is arranged in the heat insulation layer 10, adjacent to the tube sheet 00, and high-temperature-resistant metal materials such as stainless steel or copper alloy can be used to make it have good heat conduction performance and corrosion resistance.

[0050] The water-cooling pipe 31 can be in various shapes such as a straight pipe, a U-shaped pipe, a spiral pipe, etc.; the water-cooling pipe 31 forms a dense network inside the heat insulation layer 10 to ensure that the cooling water can be evenly distributed and uniform cooling can be achieved.

[0051] The water supply pipe 32 can be made of high-temperature-resistant and pressure-resistant metal materials such as carbon steel or stainless steel. It is used to introduce the cooling water from the external water source into the water-cooling pipe 31. A filter can be installed at the inlet of the water supply pipe 32 to prevent impurities from entering the water-cooling pipe 31 and avoid blockage. A regulating valve can also be installed to control the flow rate and pressure of the cooling water to ensure the stable operation of the system. Among them, the water supply pipe 32 can be connected to the water-cooling pipe 31 through a flange or welding to ensure tightness and reliability.

[0052] The water outlet pipe 33 can be made of high-temperature-resistant and pressure-resistant metal materials such as carbon steel or stainless steel. It exports the hot water that has absorbed heat from the heat insulation layer 10. A temperature sensor or thermometer is installed at the outlet of the water outlet pipe 33 to monitor the temperature of the cooling water flowing out of the heat insulation layer 10 in real time to ensure that it is within a safe range. A flow meter can also be installed to monitor the flow rate of the cooling water to ensure normal operation. The water outlet pipe 33 is connected to the water-cooling pipe 31 through a flange or welding to ensure tightness and reliability.

[0053] The water supply assembly 34 is arranged outside the heat insulation layer 10 and is used to be connected to the water supply pipe 32 to provide cooling water for the water-cooling device. The water supply assembly 34 includes a pump, a water storage tank, a temperature control system, a filter, a pressure gauge, etc.

[0054] Among them, the pump is used to provide sufficient water pressure and flow rate to ensure that the cooling water can smoothly pass through the water-cooling pipe 31. The pump can be a centrifugal pump or a plunger pump. The water storage tank is used to store the cooling water to ensure that there is sufficient water source in the system. The temperature control system monitors the temperature of the cooling water through the temperature sensor installed on the water outlet pipe 33 and adjusts the rotation speed of the pump or the flow rate of the cooling water as needed to maintain the temperature of the cooling water within the set range. The filter is installed at the inlet of the water supply assembly 34 to further filter the cooling water to ensure clean water quality. The pressure gauge is installed at the outlet of the water supply assembly 34 to monitor the system pressure to ensure the safe operation of the system.

[0055] The cooling water inside the water-cooling pipe 31 exchanges heat efficiently with the high-temperature tube sheet 00, significantly reducing the temperature of the tube sheet 00, reducing thermal stress, protecting the equipment from high-temperature damage, and by effectively reducing the temperature of the tube sheet 00, reducing the risks of material aging, deformation, and damage caused by high temperature, avoiding the generation of gaps due to deformation, improving the safety of the equipment, and also reducing the impact of high temperature on the tube sheet 00, extending the service life of the tube sheet 00 and the entire equipment.

[0056] In summary, through the collaborative work of the water-cooling pipe 31, the water supply pipe 32, the water outlet pipe 33, and the water supply component 34, the water cooling device 30 effectively reduces the temperature of the steam generator tube sheet 00, improves the safety and thermal efficiency of the equipment, extends the service life of the equipment, and at the same time reduces the maintenance cost and energy consumption.

[0057] Furthermore, in some embodiments, a support structure is further included. One end of the support structure is fixedly connected to the water-cooling pipe 31, and the other end is fixedly connected to the tube sheet 00.

[0058] Specifically, in order to improve the stability of the water-cooling pipe 31 and prevent it from moving during operation, resulting in dislocation or affecting the firmness between the heat insulation layer 10 and the tube sheet 00, in the technical solution adopted in this application, a support structure is further included. The support structure may include a support rod, a fixing member, and a heat insulation gasket.

[0059] Among them, the support rod and the fixing member can both be made of high-temperature-resistant metal materials, such as stainless steel, carbon steel, or high-temperature alloy, so as to have good mechanical strength and corrosion resistance. The support rod can be a straight rod, an L-shaped rod, or a U-shaped rod. The fixing member can be a clamp, a bolt, a welded part, etc., for firmly fixing the support rod on the water-cooling pipe 31 and the tube sheet 00 to ensure the stability of the structure.

[0060] The heat insulation gasket can use high-temperature-resistant heat insulation materials, such as ceramic fiber, calcium silicate board, etc. The heat insulation material can effectively reduce heat conduction and protect the support structure from the influence of high temperature. By placing a heat insulation gasket between the contact surface of the support rod and the tube sheet 00, heat conduction is reduced, and the mechanical properties of the support structure are protected.

[0061] In the tube sheet 00 protection device of the steam generator, the support structure is used to fix the water-cooled pipe 31 to ensure its stability and fixed position inside the heat insulation layer 10. Through the thermal insulation design of the support structure, heat conduction is reduced, the mechanical properties of the support structure are protected, and the long-term stable operation of the system is ensured. One end of the support structure is fixedly connected to the water-cooled pipe 31, and the other end is fixedly connected to the tube sheet 00, ensuring the stability and fixed position of the water-cooled pipe 31 inside the heat insulation layer 10. By using high-temperature resistant materials and heat insulation gaskets, the support structure not only has good mechanical strength but also can effectively reduce heat conduction, protect the mechanical properties of the support structure, and ensure the long-term stable operation of the system.

[0062] Further, in some embodiments, it further includes: a backing plate disposed in the heat insulation layer 10. The backing plate includes a first surface and a second surface disposed opposite to each other. The water-cooled pipe 31 is arranged on the first surface, and the backing plate contacts the outer surface of the tube sheet 00 by using the second surface.

[0063] In order to further reduce heat conduction and protect the water-cooled pipe 31 and the tube sheet 00 from the influence of high temperature, in the technical solution adopted in this application, it further includes a backing plate. The backing plate can be made of high-temperature resistant heat insulation materials such as ceramic fiber board, calcium silicate board, and lightweight refractory bricks, which have both heat insulation performance and mechanical structure strength. The backing plate can be a flat plate or an arc-shaped plate.

[0064] Among them, the first surface is used to contact the water-cooled pipe 31, support and fix the water-cooled pipe 31, so as to ensure the stability and fixed position of the water-cooled pipe 31 inside the heat insulation layer 10, reduce heat conduction, and protect the water-cooled pipe 31 from the influence of high temperature. Anti-slip patterns can be added to the first surface or high-temperature resistant coatings can be applied to improve friction and corrosion resistance.

[0065] The second surface contacts the outer surface of the tube sheet 00, supports and fixes the backing plate, reduces heat conduction, protects the tube sheet 00 from the influence of high temperature, and provides stable support at the same time.

[0066] An insulation coating can be added to the second surface or high-temperature resistant adhesives can be used to improve the insulation effect and bonding strength.

[0067] The backing plate is used to directly contact the tube sheet 00, and the edge of the backing plate is covered by the heat insulation layer 10 to form an integral body. The heat insulation material of the backing plate can reduce the influence of high temperature on the tube sheet 00, protect the tube sheet 00 from heat stress damage, and extend its service life. And it can also play a role of heat buffering, reduce the influence of temperature fluctuations on the tube sheet 00 and the water-cooled pipe 31, and improve the thermal stability of the system.

[0068] Further, in some embodiments, the cross-sectional shape of the water-cooled pipe 31 is rectangular.

[0069] Specifically, in order to improve the heat exchange efficiency, the cross-section of the water-cooled pipe 31 is set as a rectangle, and more specifically, it can be a rectangle. The long side of the rectangle is close to the tube sheet 00, and the length direction of the water-cooled pipe 31 extends along the water flow direction to increase the contact area and improve the heat exchange efficiency.

[0070] Among them, the pipe with a rectangular cross-section has a larger surface area than a circular pipe, which can increase the heat dissipation area and improve the heat exchange efficiency.

[0071] Furthermore, in some embodiments, an intake pipe 40 is further included. The intake pipe 40 is arranged in the heat insulation layer 10, one end is communicated with the tail gas output end 20, and the other end passes through the tube sheet 00 and extends into the steam generator.

[0072] Specifically, there are multiple intake pipes 40, which are respectively arranged at intervals in the heat insulation layer 10 for evenly introducing the tail gas into the steam generation. One end of the intake pipe 40 is communicated with the tail gas output end 20, and the other end extends from the tube sheet 00 into the heat exchange tubes of the steam generator for transporting the tail gas to the steam generator for heat exchange.

[0073] The intake pipe 40 is made of high-temperature resistant metal materials such as stainless steel, carbon steel or superalloy, and can also be high-temperature resistant non-metal materials such as corundum ceramics. The intake pipe 40 is arranged in the heat insulation layer 10. In the steam generator, the intake pipe 40 introduces the high-temperature tail gas from the tail gas output end 20 into the steam generator to ensure the smooth transmission of the tail gas. By arranging multiple intake pipes 40, the high-temperature tail gas is evenly distributed in the steam generator, improving the heat exchange efficiency and generating the required steam. The high-temperature resistant material of the heat insulation layer 10 wrapped around the intake pipe 40 can effectively reduce heat conduction, protecting the intake pipe 40 and the tube sheet 00 from the influence of high temperature and ensuring the long-term stable operation of the system. Therefore, by using the intake pipe 40, one end is communicated with the tail gas output end 20, and the other end passes through the tube sheet 00 and extends into the steam generator to ensure the smooth transmission and even distribution of the high-temperature tail gas. The design of the intake pipe 40 not only has good high-temperature resistance and mechanical strength, but also reduces heat conduction through heat insulation treatment, protecting the intake pipe 40 and the tube sheet 00 from the influence of high temperature and ensuring the long-term stable operation of the system.

[0074] Furthermore, in some embodiments, the intake pipe 40 includes a first pipe section 41 and a second pipe section 42 arranged adjacent to each other. The first pipe section 41 is placed in the heat insulation layer 10, and the second pipe section 42 extends into the steam generator;

[0075] Among them, the wall thickness of the first pipe section 41 is greater than that of the second pipe section 42, and a first protective member 50 is arranged between the end of the first pipe section 41 close to the second pipe section 42 and the tube sheet 00.

[0076] Specifically, the first pipe section 41 and the second pipe section 42 are an integral connected pipe section with the same inner diameter, but the wall thickness of the first pipe section 41 is greater than that of the second pipe section 42, so that the outer contour of the intake pipe 40 forms a stepped pipe section. Since the second pipe section 42 extends out of the heat insulation layer 10, the extended second pipe section 42 with external leakage is used to enter the steam generator, which is easy to install and position. The end of the first pipe section 41 close to the second pipe section 42 abuts against the pipe wall, and a first protective member 50 is provided between the end of the first pipe section 41 close to the second pipe section 42 and the tube sheet 00. The first protective member 50 can be fixed to the first pipe section 41 and the tube sheet 00 by a clamp, bolts or welding to ensure its stability in a high-temperature environment.

[0077] Among them, the first protective member 50 can be made of a high-temperature resistant elastic material, such as high-temperature rubber, ceramic fiber composite material or metal bellows, so that it has good heat insulation performance and elasticity and can absorb deformation.

[0078] Furthermore, the first protective member 50 can be an annular gasket installed between the first pipe section 41 and the tube sheet 00 to provide good heat insulation effect and deformation absorption ability. It can also be a bellows, which has good elasticity and can absorb the deformation caused by temperature change to reduce the influence of thermal stress. It can also be a sleeve 60 sleeved on the second pipe section 42 and abutting against the end of the first pipe section 41, so that one side of the first protective member 50 contacts the end of the first pipe section 41 and the other side abuts against the tube sheet 00, providing additional heat insulation protection and deformation absorption ability. The heat insulation characteristic of the first protective member 50 can effectively reduce heat conduction, protect the first pipe section 41 and the tube sheet 00 from the influence of high temperature and extend their service life. The elastic material of the first protective member 50 can absorb the deformation caused by temperature change, reduce the influence of thermal stress on the first pipe section 41 and the tube sheet 00, and prevent the damage of the tube sheet 00 and the intake pipe 40. The elastic deformation characteristic of the first protective member 50 can compensate for the displacement caused by thermal expansion and contraction, ensuring the connection stability and sealing performance between the intake pipe 40 and the tube sheet 00.

[0079] Furthermore, in some embodiments, a sleeve 60 is further included. One end of the sleeve 60 is fixedly arranged at the air inlet of the tube sheet 00, and the other end extends into the steam generator. The second pipe section 42 extends into the sleeve 60 and is coaxially arranged;

[0080] Among them, the outer diameter of the second pipe section 42 is smaller than the inner diameter of the sleeve 60, and a second protective member 70 is arranged on the outer side of the second pipe section 42.

[0081] Specifically, the sleeve 60 can be made of high-temperature resistant metal materials such as stainless steel or superalloy, endowing it with good mechanical strength and corrosion resistance. The sleeve 60 can be cylindrical, with one end fixedly arranged at the air inlet of the tube sheet 00, and the other end extending into the steam generator. Moreover, the inner diameter of the sleeve 60 should be larger than the outer diameter of the second pipe section 42 to ensure that the second pipe section 42 can be smoothly inserted and coaxially arranged.

[0082] The second protective member 70 is usually made of high-temperature resistant elastic materials such as high-temperature rubber, ceramic fiber composite materials or metal bellows. These materials have good heat insulation performance and elasticity and can absorb deformation.

[0083] The second protective member 70 is an annular gasket that wraps around the second pipe section 42. The outer peripheral side of the second protective member 70 contacts the inner wall of the sleeve 60, providing heat insulation and deformation absorption functions. The second protective member 70 can be fixed to the outside of the second pipe section 42 by clamps, bolts or adhesives to ensure its stability in a high-temperature environment.

[0084] The second protective member 70 can reduce the direct impact of high-temperature exhaust gas on the tube sheet 00 and protect the mechanical properties of the tube sheet 00. The elastic material of the second protective member 70 can absorb the deformation caused by temperature changes, reduce the influence of thermal stress on the second pipe section 42 and the sleeve 60, and prevent damage to the tube sheet 00 and the intake pipe 40.

[0085] The elastic design of the second protective member 70 can compensate for the displacement caused by thermal expansion and contraction, ensuring the connection stability and sealing performance between the second pipe section 42 and the sleeve 60.

[0086] Through their high-temperature resistant materials and reasonable structural design, the sleeve 60 and the second protective member 70 not only provide good heat insulation protection but also can absorb the deformation caused by temperature changes, reducing the influence of thermal stress on the second pipe section 42 and the sleeve 60.

[0087] Under the combined action of the first protective member 50 and the second protective member 70, the gap generated by the deformation due to the influence of high-temperature thermal stress at the connection between the sleeve 60 and the tube sheet 00 is avoided. Furthermore, the sealing performance of the tube sheet 00 is improved, preventing the internal steam and water from overflowing through the gap generated by the deformation.

[0088] Furthermore, in some embodiments, both the first protective member 50 and the second protective member 70 are made of ceramic fiber material.

[0089] Specifically, ceramic fiber has an extremely low thermal conductivity, which can effectively reduce heat conduction, protect the first pipe section 41, the second pipe section 42 and the tube sheet 00 from the influence of high temperature, and extend their service life.

[0090] The ceramic fiber has good elasticity and flexibility, can absorb the deformation caused by temperature changes, reduce the influence of thermal stress on the first pipe section 41, the second pipe section 42 and the casing 60, and prevent the damage of the tube sheet 00 and the intake pipe 40. The elastic design of the ceramic fiber can compensate for the displacement caused by thermal expansion and contraction, ensuring the connection stability and sealing performance between the first pipe section 41 and the tube sheet 00, and between the second pipe section 42 and the casing 60. The protective parts of the ceramic fiber ensure the sealing performance between the first pipe section 41 and the tube sheet 00, and between the second pipe section 42 and the casing 60, prevent gas leakage, and ensure the safe operation of the system.

[0091] Utilizing the characteristic of extremely low thermal conductivity of the ceramic fiber, it can effectively reduce heat conduction and provide good heat insulation effect.

[0092] Among them, the first protective part 50 is a ceramic fiber blanket. The ceramic fiber blanket is made of high-purity ceramic fiber, has an extremely low thermal conductivity and good high-temperature resistance. The thickness of the ceramic fiber blanket is between 10 mm and 50 mm, ensuring sufficient heat insulation effect and deformation absorption ability. The ceramic fiber blanket has good elasticity and flexibility, can absorb the deformation caused by temperature changes, and reduce the influence of thermal stress on the first pipe section 41 and the tube sheet 00.

[0093] The second protective part 70 is a ceramic fiber paper. The thickness of the ceramic fiber paper is between 1 mm and 5 mm, ensuring sufficient heat insulation effect and deformation absorption ability. The second protective part 70 is arranged on the outer side of the second pipe section 42, between the inner wall of the casing 60. The ceramic fiber paper can be cut into an annular gasket and installed between the second pipe section 42 and the casing 60, providing good heat insulation effect and deformation absorption ability. The ceramic fiber paper can also be cut into a strip-shaped gasket and wound around the outer side of the second pipe section 42, providing additional heat insulation protection and deformation absorption ability.

[0094] Embodiment 2

[0095] In Embodiment 2 of the present application, a steam generator is proposed, including: a steam generator tube sheet protection device, and the steam generator tube sheet protection device includes: a heat insulation layer 10, a water cooling device 30.

[0096] The heat insulation layer 10 is arranged on the outer surface of the tube sheet 00 of the steam generator, for isolating the tail gas output end 20. Part of the water cooling device 30 is arranged in the heat insulation layer 10 and is adjacent to the tube sheet 00.

[0097] It further includes a housing, which is fixedly arranged at one end of the body of the steam generator and extends towards the tail gas output end 20. The heat insulation layer 10 of the tube sheet protection device is arranged in the housing and wraps the tail gas output end 20. The housing is used to provide support and protection for the tube sheet protection device.

[0098] Specifically, the thickness of the heat insulation layer 10 can be between 50 mm and 100 mm to ensure sufficient heat insulation effect. With the double protection of the heat insulation layer 10 and the water cooling device 30, the steam generator effectively reduces the temperature of the tube sheet 00, reduces the thermal stress of the tube sheet 00, improves the sealing performance, safety and thermal efficiency of the equipment, extends the service life of the equipment, and at the same time reduces the maintenance cost and energy consumption. It should be noted that in the description of this specification, the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application; terms such as "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0099] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0100] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present application, and all of them should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claimed rights.

Claims

1. A steam generator tube sheet protection device, characterized in that: include: A heat insulation layer, which is disposed on the outer surface of the tube sheet of the steam generator and is used to isolate the tail gas output end; A water cooling device is partially disposed in the thermal insulation layer and adjacent to the tube sheet.

2. The steam generator tube sheet protection device according to claim 1, characterized in that: The water cooling device comprises: A water cooling pipe, wherein the water cooling pipe is arranged in the heat insulation layer; A water supply pipe, the water supply pipe is connected to the water cooling pipe and extends to the outside of the thermal insulation layer; A water outlet pipe, the water outlet pipe is connected to the water cooling pipe and extends to the outside of the thermal insulation layer; A water supply assembly is connected to the water supply pipe and is used to supply water to the water cooling device.

3. The steam generator tube sheet protection device according to claim 2, characterized in that: A supporting structure, one end of which is fixedly connected to the water-cooling pipe, and the other end of which is fixedly connected to the tube sheet.

4. The steam generator tube sheet protection device according to claim 2, characterized in that: Also includes: A pad is arranged in the thermal insulation layer, the pad comprises a first surface and a second surface arranged opposite to each other, the water cooling pipe is arranged on the first surface, and the pad contacts the outer surface of the tube sheet by means of the second surface.

5. The steam generator tube sheet protection device according to claim 1, characterized in that: The cross section of the water cooling pipe is in the shape of a rectangle.

6. The steam generator tube sheet protection device according to claim 1, characterized in that: Also includes: An air intake pipe is arranged in the heat insulation layer, one end of the air intake pipe is connected to the tail gas output end, and the other end passes through the tube sheet and extends into the steam generator.

7. The steam generator tube sheet protection device according to claim 6, characterized in that: The air inlet pipe comprises a first pipe section and a second pipe section which are adjacent to each other, the first pipe section is placed in the heat insulation layer, and the second pipe section extends into the steam generator; The wall thickness of the first pipe segment is greater than the wall thickness of the second pipe segment, and a first protective member is provided between the end of the first pipe segment close to the second pipe segment and the tube sheet.

8. The steam generator tube sheet protection device according to claim 7, characterized in that: Also includes: A sleeve, one end of which is fixedly arranged with the air inlet of the tube sheet, and the other end of which extends into the interior of the steam generator, and the second pipe section extends into the sleeve and is coaxially arranged; The outer diameter of the second pipe section is smaller than the inner diameter of the sleeve, and a second protective member is arranged on the outer side of the second pipe section.

9. The steam generator tube sheet protection device according to claim 8, characterized in that: The first protective member and the second protective member are both made of ceramic fiber.

10. A steam generator, characterized in that: include: The steam generator tube sheet protection device according to any one of claims 1 to 9, wherein the steam generator tube sheet protection device comprises: A tube sheet, arranged on any end surface of the steam generator; A heat insulation layer, the heat insulation layer is arranged on the end surface of the tube sheet and covers the tube sheet; A water cooling device is partially disposed in the thermal insulation layer and adjacent to the tube sheet.

Images