Waste heat boiler

Abstract

The embodiment of the utility model discloses a waste heat boiler, and belongs to the technical field of waste heat utilization, according to the waste heat boiler, a flue gas outlet is formed in a boiler body, the flue gas outlet communicates with a hearth to form a flue gas channel, a pipe body is arranged, high-temperature regenerated flue gas can be introduced into the first end, and the second end is inserted into the boiler body and communicates with the hearth; high-temperature regenerated flue gas can enter the flue gas channel and is mixed with the high-temperature flue gas to form mixed flue gas, a heat exchange assembly is arranged and comprises a superheater and an economizer which are connected, one end of the superheater is connected with the furnace body and communicates with the flue gas outlet, and the other end of the superheater communicates with the economizer; mixed flue gas discharged from the flue gas outlet sequentially passes through the superheater and the economizer to be subjected to heat exchange, waste heat in the mixed flue gas is utilized, the stability of flue gas parameters in a hearth can be guaranteed, the overall size of a boiler body is reduced, and therefore loss is reduced, the heat exchange efficiency between the heat exchange assembly and the mixed flue gas is improved, and energy is saved. And the utilization efficiency of waste heat in the flue gas is improved.

Description

Technical Field

[0001] The present application relates to the technical field of waste heat utilization, and in particular to a waste heat boiler. Background Art

[0002] In industries like the petrochemical industry, a certain amount of high-temperature regeneration flue gas is generated during production. Waste heat boilers (HRSGs) can absorb the heat from this high-temperature regeneration flue gas, enabling waste heat recovery and utilization. However, due to fluctuations in the parameters of the usable high-temperature regeneration flue gas produced by upstream equipment, the amount of heat that can be absorbed by the HRSGs is unstable. Furthermore, existing HRSGs are large in size, resulting in high heat losses during the combustion of the high-temperature regeneration flue gas, poor heat exchange, and low waste heat utilization efficiency. Utility Model Content

[0003] The embodiment of the present application provides a waste heat boiler, which can solve the problem of high heat loss during the combustion of high-temperature regenerated flue gas in existing waste heat boilers, resulting in low waste heat utilization efficiency.

[0004] and a heat exchanger arranged at a distance from the furnace body, wherein the heat exchanger includes a first heat exchanger and a second heat exchanger includes a first heat exchanger and a second heat exchanger. The heat exchanger includes a heat exchanger and a ...

[0005] Optionally, the waste heat boiler also includes a steam drum, a riser, a downcomer and an outlet pipe; the furnace body also includes water-cooled wall tubes, which are arranged on the inner wall of the furnace body and surround the furnace in the circumferential direction of the furnace; the steam drum is arranged on the side of the furnace body away from the tube body; one end of the riser is connected to the steam drum, and the other end is connected to the water-cooled wall tube to transport the steam-water mixture in the water-cooled wall tube to the steam drum, and the steam drum can separate the steam-water mixture into steam and water; one end of the downcomer is connected to the steam drum, and the other end is connected to the water-cooled wall tube to transport the water after steam-water separation to the water-cooled wall tube; one end of the outlet pipe is connected to the steam drum, and the other end is connected to the superheater to transport the steam generated after steam-water separation to the superheater.

[0006] Optionally, the superheater includes a low-temperature superheater and a high-temperature superheater connected to each other, the end of the low-temperature superheater facing away from the high-temperature superheater is connected to the furnace body and communicates with the flue gas outlet, and the high-temperature superheater is connected to the economizer; the outlet pipe is connected to the low-temperature superheater.

[0007] Optionally, the economizer includes a high-temperature economizer and at least one low-temperature economizer; one end of the high-temperature economizer is connected to the superheater, and the other end is connected to the low-temperature economizer, and the end of the low-temperature economizer facing away from the high-temperature economizer is connected to the flue gas exhaust pipe.

[0008] Optionally, there are two low-temperature economizers, and the two low-temperature economizers are connected in sequence, one low-temperature economizer is connected to the high-temperature economizer, and the other low-temperature economizer is connected to the flue gas exhaust pipe.

[0009] Optionally, the furnace body further includes a rectifying grid, and the rectifying grid is internally connected to the flue gas outlet.

[0010] Optionally, the waste heat boiler also includes a burner, which is arranged at one end of the furnace body. The burner includes an air supply end and a combustion end that are relatively arranged. The air supply end is located outside the furnace body, and the combustion end is located in the furnace. The combustion end burns to generate high-temperature flue gas.

[0011] Optionally, the burner is low NO x burner.

[0012] Optionally, a valve body is provided on the pipe body to adjust and control the amount of high-temperature regeneration flue gas introduced.

[0013] Optionally, a refractory castable layer is provided on the side wall of the water-cooled wall tube.

[0014] The beneficial effect of the present application is to provide a waste heat boiler, which provides a flue gas outlet on the furnace body, and the flue gas outlet is connected to the furnace to form a flue gas channel. The high-temperature flue gas generated in the furnace can be discharged from the furnace body through the flue gas channel, and a pipe body is provided. The pipe body and the furnace body are spaced apart. The first end of the pipe body can pass high-temperature regenerated flue gas, and the second end is inserted into the furnace body and connected to the furnace, and the second end is arranged opposite to the flue gas outlet, so that the high-temperature regenerated flue gas passed into the pipe body can enter the flue gas channel and mix with the high-temperature flue gas in the furnace to form mixed flue gas, and the mixed flue gas can be discharged from the furnace body from the flue gas outlet, and a heat exchange component is provided. The heat exchange component includes a connected superheater and an economizer, and the end of the superheater facing away from the economizer is connected to the furnace body and connected to the flue gas outlet, so that the mixed flue gas discharged through the flue gas outlet is discharged from the furnace body. The heat exchange is carried out through the superheater and the economizer to utilize the waste heat in the mixed flue gas. A separate pipe body is set to introduce high-temperature regenerated flue gas into the furnace of the furnace body, and the high-temperature regenerated flue gas introduced into the furnace is mixed with the high-temperature flue gas in the furnace to form a mixed flue gas. Compared with directly introducing high-temperature regenerated flue gas into the furnace body, the parameter stability of the flue gas in the furnace can be guaranteed, and the fluctuation of the absorbed heat caused by the parameter fluctuation of the high-temperature regenerated flue gas can be avoided. While utilizing the waste heat in the high-temperature regenerated flue gas, the steam production of the waste heat boiler can be effectively improved by adjusting the amount of high-temperature flue gas generated in the furnace. The independent structural design of the heat exchange component and the furnace body can reduce the overall size of the furnace body, thereby reducing losses, improving the heat exchange efficiency between the heat exchange component and the mixed flue gas, and improving the utilization efficiency of the waste heat in the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is a schematic structural diagram of a waste heat boiler provided in an embodiment of the present application;

[0017] Figure 2 yes Figure 1 side view.

[0018] Description of reference numerals:

[0019] 1. Waste heat boiler;

[0020] 10. Furnace body, 101. Furnace, 11. Flue gas outlet, 110. Flue gas channel, 12. Water-cooled wall tube, 13. Rectifier grid;

[0021] 20. Tube body, 21. First end, 22. Second end, 23. Valve body;

[0022] 30. Heat exchange assembly, 31. Superheater, 311. Low-temperature superheater, 312. High-temperature superheater, 313. Connecting pipe, 32. Economizer, 321. High-temperature economizer, 322. Low-temperature economizer;

[0023] 40. Smoke exhaust pipe;

[0024] 50, steam drum, 51, riser, 52, downcomer, 53, outlet pipe;

[0025] 60. Burner, 61. Gas supply end;

[0026] 70. Support;

[0027] X, first direction, Y, second direction, Z, third direction. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0029] In some embodiments of the present application, a waste heat boiler 1 is provided, referring to Figure 1 and Figure 2 The waste heat boiler 1 includes: a furnace body 10, a pipe body 20, a heat exchange component 30 and a flue gas exhaust pipe 40.

[0030] Reference Figure 1 The furnace body 10 is provided with a furnace 101 inside, and high-temperature flue gas can be generated inside the furnace 101. A flue gas outlet 11 is provided on the furnace body 10, and the flue gas outlet 11 is connected with the furnace 101 to form a flue gas channel 110. The high-temperature flue gas can be discharged from the furnace body 10 through the flue gas outlet 11 through the flue gas channel 110. Figure 1 and Figure 2The furnace body 10 has a first direction X, a second direction Y, and a third direction Z that are orthogonal to each other. The first direction X is parallel to the length direction of the furnace body 10 and the horizontal direction, the second direction Y is parallel to the width direction Y of the furnace body 10, and the third direction Z is parallel to the height direction of the furnace body 10 and the vertical direction. The flue gas outlet 11 is opened on a side wall of the furnace body 10 along the third direction Z.

[0031] Reference Figure 1 and Figure 2 The tube body 20 is spaced apart from the furnace body 10. Specifically, the tube body 20 is disposed on a side of the furnace body 10 away from the flue gas outlet 11 along the third direction Z. The tube body 20 extends along the first direction X. The tube body 20 includes a first end 21 and a second end 22 arranged opposite each other along the first direction X. The first end 21 is capable of receiving high-temperature regeneration flue gas. The second end 22 is inserted into the furnace body 10 and communicates with the furnace 101. The second end 22 is arranged opposite the flue gas outlet 11 along the third direction Z, so that the high-temperature regeneration flue gas entering the tube body 20 can enter the flue gas passage 110 and mix with the high-temperature flue gas generated inside the furnace 101 to form mixed flue gas. The mixed flue gas can then be discharged from the furnace body through the flue gas outlet 11. The first end 21 is capable of receiving high-temperature regeneration flue gas, that is, the first end 21 of the tube body 20 can be connected to an upstream device, so that the high-temperature regeneration flue gas generated by the upstream device can pass into the tube body 20.

[0032] Reference Figure 1 The heat exchange component 30 is spaced apart from the furnace body 10. The heat exchange component 30 includes a superheater 31 and an economizer 32 connected to each other. The end of the superheater 31 facing away from the economizer 32 is connected to the furnace body 10 and communicates with the flue gas outlet 11. The end of the economizer 32 facing away from the superheater 31 is connected to the flue gas exhaust pipe 40. The mixed flue gas discharged through the flue gas outlet 11 passes through the superheater 31 and the economizer 32 in sequence and is discharged from the flue gas exhaust pipe 40.

[0033] In the petrochemical industry and other industries, a certain amount of high-temperature regeneration flue gas is generated during the production process. Waste heat boilers can absorb the heat in the high-temperature regeneration flue gas to achieve waste heat recovery and utilization. However, the parameters of the usable high-temperature regeneration flue gas produced by upstream devices fluctuate to a certain extent, resulting in instability in the amount of heat that can be absorbed by the waste heat boiler. In addition, in existing waste heat boilers, heat exchange equipment such as superheaters and economizers are usually installed inside the furnace body, resulting in a large furnace body and high heat loss. In addition, the high-temperature regeneration flue gas generated upstream is directly introduced into the furnace body. The high-temperature regeneration flue gas directly introduced into the furnace body mixes unevenly with the high-temperature flue gas generated inside the furnace body. The heat exchange effect between the unevenly mixed flue gas and the heat exchange equipment is poor, resulting in low efficiency of waste heat boiler utilization of the waste heat in the high-temperature regeneration gas.

[0034] The waste heat boiler 1 provided in the embodiment of the present application has a flue gas outlet 11 on the furnace body 10, and high-temperature flue gas can be generated inside the furnace 101 of the furnace body 10. The flue gas outlet 11 is connected to the furnace 101 to form a flue gas channel 110 for the flue gas to discharge from the furnace body 10, and a pipe body 20 is provided. The pipe body 20 is spaced apart from the furnace body 10, and the first end 21 of the pipe body 20 can pass high-temperature regenerated flue gas, and the second end 22 is inserted into the furnace body 10 and connected to the furnace 101, and the second end 22 is arranged opposite to the flue gas outlet 11, so that the high-temperature regenerated flue gas passed into the pipe body 20 can enter the flue gas channel 110 and mix with the high-temperature flue gas generated inside the furnace 101 to form mixed flue gas. The setting of the pipe body 20 enables the waste heat boiler 1 to flexibly connect to the upstream device to mix the high-temperature regenerated flue gas with the high-temperature flue gas generated in the furnace 101 to form mixed flue gas. , thereby ensuring the uniformity of the mixed flue gas formed by the mixing of the high-temperature regeneration flue gas and the high-temperature flue gas, and when the high-temperature regeneration flue gas produced by the upstream device fluctuates (such as heat fluctuation, flow fluctuation, etc.), the high-temperature regeneration flue gas can be used to supplement the fluctuating high-temperature regeneration flue gas to ensure the parameter stability of the mixed flue gas formed after mixing, and then ensure the parameter stability of the mixed flue gas entering the heat exchange component 30, and ensure the heat exchange efficiency, so that while utilizing the waste heat in the high-temperature regeneration flue gas, by adjusting the amount of high-temperature flue gas generated inside the furnace, the steam production of the waste heat boiler is effectively improved, the interval between the heat exchange component 30 and the furnace body 10 is set, and the heat exchange component 30 is separated from the furnace body 10, thereby effectively reducing the size of the furnace body 10, improving the combustion efficiency of the mixed flue gas in the furnace 101, reducing heat loss, and improving the utilization efficiency of the waste heat in the flue gas. Moreover, the structural design in which the superheater 31 and the economizer 32 are connected in sequence along the direction of flue gas flow forms a modular design in the heat exchange component 30, which is convenient for subsequent inspection, replacement and maintenance, ensures the waste heat recovery and utilization efficiency, and ensures the service life of the heat exchange component 30. Moreover, the modular design is light in weight and quick to transport and install.

[0035] In some embodiments, reference Figure 1 and Figure 2 The waste heat boiler 1 also includes a steam drum 50, an ascending pipe 51, a descending pipe 52 and an outlet pipe 53. Figure 1 The furnace body 10 further includes a water-cooled wall tube 12, which is provided on the inner wall of the furnace body 10. The water-cooled wall tube 12 surrounds the furnace 101 along the circumferential direction of the furnace 101. Figure 1 and Figure 2The steam drum 50 is arranged on the side of the furnace body 10 away from the tube body 20. Specifically, the steam drum 50 is arranged on the side of the furnace body 10 away from the tube body 20 along the third direction Z. The riser 51 extends along the third direction Z. One end of the riser 51 is connected to the steam drum 50, and the other end is communicated with the water-cooled wall tube 12 to transport the steam-water mixture in the water-cooled wall tube 12 to the steam drum 50. The steam drum 50 can separate the steam-water mixture into steam and water to obtain steam and water. The downcomer 52 extends along the third direction Z. One end of the downcomer 52 is connected to the steam drum 50, and the other end is communicated with the water-cooled wall tube 12 to transport the water after steam-water separation to the water-cooled wall tube 12. One end of the outlet pipe 53 is connected to the steam drum 50, and the other end is connected to the superheater 31. The steam generated by the steam-water separation in the steam drum 50 is transported to the superheater 31 through the outlet pipe 53. The superheater 31 heats the steam to form superheated steam.

[0036] The design of the water-cooled wall tubes 12 is such that cooling water is passed into the water-cooled wall tubes 12, thereby performing heat exchange with the mixed flue gas inside the furnace 101, thereby regulating the temperature inside the furnace 101 and ensuring thermal efficiency. After the heat exchange, part of the cooling water evaporates to form a steam-water mixture, which is transported to the steam drum 50 through the riser 51. The steam drum 50 separates the steam-water mixture into steam and water, and the water returns to the water-cooled wall tubes 12 through the downcomer 52 to form a circulation. The steam is transported to the superheater 31 through the outlet pipe 53, and is heated by the superheater 31 to form superheated steam.

[0037] Due to the fluctuations in the parameters of the high-temperature regeneration flue gas produced by upstream equipment, most existing waste heat boilers directly introduce this high-temperature regeneration flue gas into the furnace. This results in unstable utilization of the heat from the high-temperature regeneration flue gas within the furnace, which in turn leads to instability in the amount of steam separated from the steam drum of the existing waste heat boiler and the amount of superheated steam generated by the superheater. Furthermore, the high-temperature regeneration flue gas has a limited capacity for absorption, which limits the amount of superheated steam output by the existing waste heat boiler, making it difficult to achieve the target steam production requirement. Typically, directly introducing high-temperature regeneration flue gas into the waste heat boiler produces approximately 40 t / h of superheated steam.

[0038] In the waste heat boiler 1 provided in the embodiment of the present application, the setting of the pipe body 20 enables the waste heat boiler 1 to be flexibly connected to the upstream device, and mix the high-temperature regenerated flue gas with the high-temperature flue gas in the furnace 101 to form a mixed flue gas. When the high-temperature regenerated flue gas produced by the upstream device fluctuates (such as heat fluctuations, flow fluctuations, etc.), the high-temperature regenerated flue gas can be used to supplement the fluctuating high-temperature regenerated flue gas, thereby ensuring the parameter stability of the mixed flue gas formed after mixing, and then ensuring the parameter stability of the mixed flue gas entering the heat exchange component 30, ensuring the heat exchange efficiency between the heat exchange component 30 and the mixed flue gas, and then ensuring the amount of steam separated by the steam drum 50, and ensuring the amount of superheated steam output by the superheater 31. Under normal circumstances, in the waste heat boiler 1 provided in the embodiment of the present application, the amount of superheated steam output by the superheater 31 can reach 80t / h, which meets the target steam volume demand of the downstream equipment.

[0039] In some embodiments, reference Figure 1 The superheater 31 includes a low-temperature superheater 311 and a high-temperature superheater 312 connected to each other. The end of the low-temperature superheater 311 away from the high-temperature superheater 312 is connected to the furnace body 10 and communicates with the flue gas outlet 11. The high-temperature superheater 312 is connected to the economizer 32. Specifically, the end of the high-temperature superheater 312 away from the low-temperature superheater 311 is connected to the economizer 32, and the outlet pipe 53 is connected to the low-temperature superheater 311. Figure 1 The low-temperature superheater 311 and the high-temperature superheater 312 are connected in sequence along the flow direction of the mixed flue gas. The coordinated design of the low-temperature superheater 311 and the high-temperature superheater 312 can form a step-by-step temperature increase for the mixed flue gas, thereby avoiding heat loss due to excessive heating rate of the mixed flue gas, ensuring the heat utilization efficiency in the mixed flue gas, and can also step-by-step temperature increase for the steam transported by the outlet pipe 53, thereby avoiding heat loss due to excessive heating rate of the steam.

[0040] In some embodiments, reference Figure 1 The low-temperature superheater 311 and the high-temperature superheater 312 are spaced apart along the first direction X, and the low-temperature superheater 311 is connected to the high-temperature superheater 312 through a connecting pipe 313 .

[0041] In some embodiments, reference Figure 1 The economizer 32 includes a high-temperature economizer 321 and at least one low-temperature economizer 322. One end of the high-temperature economizer 321 is connected to the superheater 31, and the other end is connected to the low-temperature economizer 322. The end of the low-temperature economizer 322 away from the high-temperature economizer 321 is connected to the flue gas exhaust pipe 40. Figure 1In the embodiment shown, the high-temperature economizer 321 and the low-temperature economizer 322 are spaced apart along the third direction Z, one end of the high-temperature economizer 321 is connected to the high-temperature superheater 312, and the other end is connected to the low-temperature economizer 322. The coordinated design of the high-temperature economizer 321 and the low-temperature economizer 322 forms a recovery of heat in the mixed flue gas heated by the high-temperature superheater 312, and the high-temperature economizer 321 is connected to the high-temperature superheater 312, so that the high-temperature mixed flue gas heated by the high-temperature superheater 312 can smoothly enter the high-temperature economizer 321, avoiding heat loss due to excessive temperature difference, and ensuring the recovery and utilization of heat in the mixed flue gas.

[0042] In some embodiments, reference Figure 1 There are two low-temperature economizers 322 , and the two low-temperature economizers 322 are spaced apart along the third direction Z. The high-temperature economizer 321 is sequentially connected to the two low-temperature economizers 322 along the flow direction of the mixed flue gas.

[0043] In some embodiments, reference Figure 1 The furnace body 10 further includes a rectifying grid 13, which is internally connected to the flue gas outlet 11. The design of the rectifying grid 13 can ensure a more uniform mixing of the high-temperature flue gas and the high-temperature regeneration flue gas in the mixed flue gas discharged from the furnace body 10 through the flue gas outlet 11, thereby ensuring the heat recovery efficiency of the heat exchange component 30 in the mixed flue gas.

[0044] In some embodiments, reference Figure 1 and Figure 2 The waste heat boiler 1 also includes a burner 60, which is arranged at one end of the furnace body 10. Specifically, the burner 60 is arranged at one end of the furnace body 10 along the first direction X. The burner 60 includes a gas supply end 61 and a combustion end (not shown in the figure) arranged opposite to each other. The gas supply end 61 is located outside the furnace body 10, and the combustion end is located in the furnace 101. The gas supply end 61 is used to provide the burner 60 with gas required for combustion (such as natural gas). The combustion end burns the gas introduced into the gas supply end 61 to burn in the furnace 101 to produce high-temperature flue gas, thereby ensuring the stability of the mixed flue gas. The amount of high-temperature flue gas generated inside the furnace 101 can be adjusted by adjusting the amount of gas introduced into the gas supply end 61, thereby flexibly controlling the combustion process, avoiding parameter fluctuations of the high-temperature regenerated flue gas introduced into the pipe body 20, affecting the heat recovery and utilization efficiency of the heat exchange component 30 in the flue gas, and effectively improving the amount of steam generated by the waste heat boiler 1.

[0045] In some embodiments, the burner 60 is a low NO x Burner, namely low nitrogen oxide burner, in the existing waste heat boiler, the high temperature flue gas generated by the supplementary combustion in the furnace is easy to mix unevenly with the high temperature regeneration flue gas, which will produce a large amount of NO x , affecting the quality of flue gas emissions, while low NOx The burner can reduce the production of NO during combustion x The amount of heat exchanger 30 can ensure the quality of the mixed flue gas discharged from the flue gas outlet 11, thereby ensuring the heat exchange effect between the subsequent heat exchange component 30 and the mixed flue gas, and further ensuring the heat recovery efficiency of the heat exchange component 30 in the mixed flue gas.

[0046] In some embodiments, reference Figure 1 A valve body 23 is provided on the pipe body 20. The setting of the valve body 23 can adjust and control the flow of the high-temperature regeneration flue gas entering the pipe body 20, thereby adjusting the heat load borne by the waste heat boiler 1 during operation, and can obtain superheated steam under multiple target parameters through the adjustment and control of the valve body 23 to meet the superheated steam requirements of different equipment.

[0047] In some embodiments, a refractory castable layer is provided on the side wall of the water-cooled wall tube 12. The refractory castable layer is formed by coating the side wall of the water-cooled wall tube 12 with refractory castable. The provision of the refractory castable layer not only prevents the furnace body 10 from being affected by flue gas corrosion during operation, but also improves the high temperature resistance of the water-cooled wall tube 12, ensures the heat exchange efficiency between the water-cooled wall tube 12 and the flue gas in the furnace 101, and thus improves the thermal efficiency.

[0048] In some embodiments, the refractory castable layer is disposed on the inner wall of the water-cooled wall tube 12 , that is, on the contact surface between the water-cooled wall tube 12 and the flue gas in the furnace 101 .

[0049] In some embodiments, reference Figure 1 and Figure 2 The waste heat boiler 1 further includes a support 70 , which is a concrete support. The furnace body 10 is mounted on the support 70 to ensure the stability of the furnace body 10 .

[0050] In some embodiments, the furnace body 10 adopts a horizontal corner tube structure, which makes the overall structure of the furnace body 10 compact, further reduces the heat loss of the flue gas in the furnace 101, and does not require a load-bearing steel frame, further reducing the manufacturing cost.

[0051] In some embodiments, manholes are provided on the superheater 31 and the economizer 32 respectively to facilitate the inspection and maintenance of the superheater 31 and the economizer 32 and improve the service life and stability of use.

[0052] The above is a detailed introduction to a waste heat boiler provided in an embodiment of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, based on the idea of ​​the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A waste heat boiler, characterized in that: include: A furnace body (10) is provided with a furnace (101) therein, wherein the furnace (101) is capable of generating high-temperature flue gas, and a flue gas outlet (11) is provided on the furnace body (10), wherein the flue gas outlet (11) is connected to the furnace (101) to form a flue gas channel (110); A pipe body (20) is spaced apart from the furnace body (10), and the pipe body (20) includes a first end (21) and a second end (22) that are arranged opposite to each other, wherein the first end (21) is capable of admitting high-temperature regeneration flue gas, and the second end (22) is inserted into the furnace body (10) and communicates with the furnace (101), and the second end (22) is arranged opposite to the flue gas outlet (11), so that the high-temperature regeneration flue gas can enter the flue gas channel (110) and mix with the high-temperature flue gas in the furnace (101) to form mixed flue gas, and then be discharged from the furnace body (10) through the flue gas outlet (11); a heat exchange assembly (30) spaced apart from the furnace body (10), the heat exchange assembly (30) comprising a superheater (31) and an economizer (32) connected to each other, the end of the superheater (31) facing away from the economizer (32) being connected to the furnace body (10) and communicating with the flue gas outlet (11); a flue gas exhaust pipe (40), one end of the economizer (32) facing away from the superheater (31) being connected to the flue gas exhaust pipe (40); The mixed flue gas discharged from the flue gas outlet (11) passes through the superheater (31) and the economizer (32) in sequence and is discharged from the flue gas exhaust pipe (40).

2. The waste heat boiler according to claim 1, characterized in that: The waste heat boiler further comprises a steam drum (50), an ascending pipe (51), a descending pipe (52) and an outlet pipe (53); The furnace body (10) further comprises a water-cooled wall tube (12), wherein the water-cooled wall tube (12) is arranged on the inner wall of the furnace body (10), and the water-cooled wall tube (12) surrounds the furnace (101) along the circumferential direction of the furnace (101); The steam drum (50) is arranged on a side of the furnace body (10) away from the tube body (20); One end of the rising pipe (51) is connected to the steam drum (50), and the other end is communicated with the water-cooled wall tube (12) to transport the steam-water mixture in the water-cooled wall tube (12) to the steam drum (50), and the steam drum (50) is capable of performing steam-water separation on the steam-water mixture; One end of the downcomer (52) is connected to the steam drum (50), and the other end is in communication with the water-cooled wall tube (12) so as to transport the water after steam-water separation to the water-cooled wall tube (12); One end of the outlet pipe (53) is connected to the steam drum (50), and the other end is connected to the superheater (31), so as to transport the steam generated after steam-water separation to the superheater (31).

3. The waste heat boiler according to claim 2, characterized in that: The superheater (31) includes a low-temperature superheater (311) and a high-temperature superheater (312) connected to each other, one end of the low-temperature superheater (311) away from the high-temperature superheater (312) is connected to the furnace body (10) and communicates with the flue gas outlet (11), and the high-temperature superheater (312) is connected to the economizer (32); The outlet pipe (53) is connected to the low-temperature superheater (311).

4. The waste heat boiler according to claim 1, characterized in that: The economizer (32) includes a high-temperature economizer (321) and at least one low-temperature economizer (322); One end of the high-temperature economizer (321) is connected to the superheater (31), and the other end is connected to the low-temperature economizer (322). The end of the low-temperature economizer (322) facing away from the high-temperature economizer (321) is connected to the flue gas exhaust pipe (40).

5. The waste heat boiler according to claim 4, characterized in that: There are two low-temperature economizers (322), and the two low-temperature economizers (322) are connected in sequence. One low-temperature economizer (322) is connected to the high-temperature economizer (321), and the other low-temperature economizer (322) is connected to the flue gas exhaust pipe (40).

6. The waste heat boiler according to claim 1, characterized in that: The furnace body (10) further comprises a rectifying grid (13), and the rectifying grid (13) is internally connected to the flue gas outlet (11).

7. The waste heat boiler according to claim 1, characterized in that: The waste heat boiler further comprises a burner (60), the burner (60) being arranged at one end of the furnace body (10), the burner (60) comprising an air supply end (61) and a combustion end which are arranged opposite to each other, the air supply end (61) being located outside the furnace body (10), the combustion end being located in the furnace (101), and the combustion end generating high-temperature flue gas by combustion.

8. The waste heat boiler according to claim 7, characterized in that: The burner (60) is a low NO x burner.

9. The waste heat boiler according to claim 1, characterized in that: The pipe body (20) is provided with a valve body (23) to adjust and control the amount of high-temperature regeneration flue gas introduced.

10. The waste heat boiler according to claim 2, characterized in that: A refractory castable layer is provided on the side wall of the water-cooled wall tube (12).

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