Needle coke waste heat boiler

Abstract

The utility model discloses a needle coke waste heat boiler. According to the waste heat boiler, the inlet flue, the front evaporation flue, the overheating flue, the rear evaporation flue, the horizontal flue, the denitration flue, the coal-saving flue and the outlet flue can be manufactured and formed in a manufacturing plant, and then the flue is transported to a site to be detachably connected and installed on the frame. The design difficulty and the construction difficulty of the needle coke waste heat boiler can be reduced, the site construction period is shortened, the construction quality is improved, and the manufacturing cost is reduced. The needle coke waste heat boiler is installed on the frame through the fixing pieces and the elastic pieces, compared with an integrally suspended waste heat boiler, the stability of the needle coke waste heat boiler can be improved, and unstable operation caused by smoke vibration is avoided.

Description

Technical Field

[0001] This application relates to the field of boiler technology, specifically to a needle coke waste heat boiler. Background Technology

[0002] Needle coke is a high-quality material for manufacturing high-power and ultra-high-power electrodes, and it is widely used in modern industry, especially in the electronics industry. The production process of needle coke involves calcining coal and petroleum under specific technological conditions to form a porous solid, silvery-gray with a metallic luster. Currently, the thermal cracking of needle coke is generally carried out in a rotary kiln calcination furnace, with the flue gas temperature reaching approximately 1100℃ after calcination. The flue gas from this furnace is characterized by high temperature, low volume, and the presence of NOx, SO2, and a large amount of dust. With increasing demands for energy conservation and environmental protection, it is necessary to maximize the utilization of the heat from the high-temperature waste gas while simultaneously reducing NOx emissions, ensuring that the entire production process remains environmentally friendly, safe, and energy-efficient.

[0003] Currently, waste heat boilers are used to utilize the heat from high-temperature waste flue gas. However, current waste heat boilers are entirely suspended water-cooled wall structures. The water-cooled wall tube bundles have large expansion volumes, making boiler design more difficult and potentially detrimental to safe and reliable operation. Water-cooled wall structures are also difficult to construct, with long on-site construction periods, difficulty in ensuring construction quality, large footprint, and high manufacturing costs. Furthermore, the overall suspension design of waste heat boilers results in poor stability, making them prone to flue gas vibration and causing operational instability. Utility Model Content

[0004] This application provides a needle-shaped coke waste heat boiler, which can solve the technical problems of current waste heat boilers having an integrally suspended water-cooled wall structure, large expansion of the water-cooled wall tube bundle, which is not conducive to the safe and reliable operation of the boiler, and the high construction difficulty of waste heat boilers with water-cooled wall structures.

[0005] This application provides a needle coke waste heat boiler, comprising: a frame; a first vertical flue installed on the frame, the first vertical flue including an inlet flue, a pre-evaporation flue, a superheated flue, and a post-evaporation flue connected sequentially from bottom to top; a second vertical flue installed on the frame and spaced apart from the first vertical flue, the second vertical flue including a denitrification flue, an economizer flue, and an outlet flue connected sequentially from top to top; a horizontal flue installed on the frame, one end of the horizontal flue connected to the top of the post-evaporation flue, and the other end of the horizontal flue connected to the top of the denitrification flue; and a steam drum installed on the frame and located above the horizontal flue; wherein at least one of the inlet flue, pre-evaporation flue, superheated flue, post-evaporation flue, horizontal flue, denitrification flue, economizer flue, and outlet flue is detachably connected to the adjacent other.

[0006] Furthermore, the inlet flue, the pre-evaporation flue, the superheated flue, and the post-evaporation flue all include a first vertical flue body; at least one of the inlet flue, the pre-evaporation flue, the superheated flue, and the post-evaporation flue includes an internal heat insulation component, which is disposed on the inner wall of the first vertical flue body.

[0007] Furthermore, the denitrification flue, the economizing flue, and the outlet flue all include a second vertical flue body; at least one of the denitrification flue, the economizing flue, and the outlet flue includes an external insulation component, which covers the outer wall of the second vertical flue body.

[0008] Furthermore, the superheated flue includes a first superheated flue and a second superheated flue connected from bottom to top; the economizing flue includes a first economizing flue and a second economizing flue connected from top to bottom.

[0009] Furthermore, the pre-evaporation flue, post-evaporation flue, denitrification flue, and second coal-saving flue are all fixed to the frame by fasteners.

[0010] Furthermore, the first superheated flue, the second superheated flue, and the first economizing flue are all connected to the frame by elastic members, which are placed vertically.

[0011] Furthermore, the first vertical flue also includes: a first expansion joint, which connects the first superheated flue and the second superheated flue; the second vertical flue also includes: a second expansion joint, which connects the denitrification flue and the first economizing flue.

[0012] Furthermore, the inlet flue is equipped with a flue gas inlet, the pre-evaporation flue is equipped with a pre-evaporator, the first superheated flue is equipped with a first superheater, the second superheated flue is equipped with a second superheater, the post-evaporation flue is equipped with a post-evaporator, the first economizer flue is equipped with a first economizer, the second economizer flue is equipped with a second economizer, and the outlet flue is equipped with a flue gas outlet. The inlet of the second economizer is connected to the feedwater inlet, the outlet of the second economizer is connected to the inlet of the first economizer, the outlet of the first economizer is connected to the inlet of the steam drum, the outlet of the steam drum is connected to the inlets of the post-evaporator and the pre-evaporator, the outlets of the post-evaporator and the pre-evaporator are both connected to the inlet of the steam drum, the steam outlet of the steam drum is connected to the inlet of the second superheater, the outlet of the second superheater is connected to the inlet of the first superheater, and the outlet of the first superheater is connected to the user's pipeline.

[0013] Furthermore, the inlet of the second economizer is located below its outlet, the inlet of the first economizer is located below its outlet, the inlet of the post-evaporator is located below its outlet, the inlet of the pre-evaporator is located below its outlet, the inlet of the second superheater is located above its outlet, and the inlet of the first superheater is located below its outlet.

[0014] Furthermore, the needle coke waste heat boiler also includes: a feedwater preheater, which is a shell-and-tube heat exchanger; the tube-side inlet of the feedwater preheater is connected to the feedwater inlet, the tube-side outlet of the feedwater preheater is connected to the inlet of the second economizer, the outlet of the second economizer is connected to the shell-side inlet of the feedwater preheater, and the shell-side outlet of the feedwater preheater is connected to the inlet of the first economizer.

[0015] Furthermore, the needle coke waste heat boiler also includes a cooling device, which is located between the outlet of the second superheater and the inlet of the first superheater, or at the outlet of the first superheater.

[0016] Furthermore, a dust removal device is installed on the horizontal flue.

[0017] Furthermore, the needle coke waste heat boiler also includes: a horizontal auxiliary flue, one end of which is connected to the top of the post-evaporation flue, and the other end of which is connected to the top of the denitrification flue. A butterfly valve is installed on the horizontal auxiliary flue.

[0018] Furthermore, a funnel-shaped dust collection and ash removal device is installed at the bottom of the inlet flue.

[0019] Furthermore, the denitrification flue includes, from top to bottom, an ammonia injection assembly, a flow straightener, and a denitrification assembly.

[0020] The needle coke waste heat boiler provided in this application embodiment includes a first vertical flue comprising an inlet flue, a pre-evaporation flue, a superheated flue, and a post-evaporation flue connected sequentially from bottom to top; a second vertical flue comprising a denitrification flue, an economizer flue, and an outlet flue connected sequentially from top to top; one end of a horizontal flue is connected to the top of the post-evaporation flue, and the other end of the horizontal flue is connected to the top of the denitrification flue; at least one of the inlet flue, pre-evaporation flue, superheated flue, post-evaporation flue, horizontal flue, denitrification flue, economizer flue, and outlet flue is detachable from the adjacent other. The detachable connection allows for the fabrication of the inlet flue, pre-evaporation flue, superheated flue, post-evaporation flue, horizontal flue, denitrification flue, economizer flue, and outlet flue within the manufacturing plant. These components are then transported to the site for detachable connection and installation on the frame. Compared to waste heat boilers with a fully suspended water-cooled wall structure, this design reduces the design and construction complexity of needle coke waste heat boilers, shortens the on-site construction period, improves construction quality, and lowers manufacturing costs. The needle coke waste heat boiler of this application is installed on the frame using fixing and elastic components. Compared to fully suspended waste heat boilers, this improves the stability of the needle coke waste heat boiler and avoids operational instability caused by flue gas vibration. Attached Figure Description

[0021] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the structure of a needle coke waste heat boiler provided in an embodiment of this application;

[0023] Figure 2 This is a schematic diagram of the water preheater provided in an embodiment of this application.

[0024] The markings in the diagram are as follows:

[0025] First vertical flue 1, second vertical flue 2, horizontal flue 3, steam drum 4, fastener 5, elastic element 6, feedwater preheater 7, horizontal auxiliary flue 8;

[0026] Inlet flue 11, pre-evaporation flue 12, post-evaporation flue 13, first superheated flue 14, second superheated flue 15, first expansion joint 16, funnel dust collection and ash removal device 111, pre-evaporator 121, post-evaporator 131, first superheater 141, second superheater 151, first vertical flue body 101, internal insulation component 102;

[0027] Denitrification flue 21, first economizing flue 22, second economizing flue 23, outlet flue 24, second expansion joint 25, ammonia injection assembly 211, rectifier grid 212, denitrification assembly 213, first economizer 221, second economizer 231, second vertical flue body 201, external insulation component 202.

[0028] Dust removal device 31, steam pipe 41, riser pipe 42, downcomer pipe 43, water supply pipe 44, pipe-side water inlet 71, pipe-side water outlet 72, shell-side water inlet 73, shell-side water outlet 74, butterfly valve 81. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] like Figure 1 As shown in the figure, this application provides a needle coke waste heat boiler. The needle coke waste heat boiler includes a frame, a first vertical flue 1, a second vertical flue 2, a horizontal flue 3, and a steam drum 4.

[0032] The first vertical flue 1 is installed on the frame and includes an inlet flue 11, a pre-evaporation flue 12, a superheated flue, and a post-evaporation flue 13 connected sequentially from bottom to top. The superheated flue includes a first superheated flue 14 and a second superheated flue 15 connected from bottom to top.

[0033] The second vertical flue 2 is installed on the frame and spaced apart from the first vertical flue 1. The second vertical flue 2 includes a denitrification flue 21, an economizing flue, and an outlet flue 24 connected sequentially from top to bottom. The economizing flue includes a first economizing flue 22 and a second economizing flue 23 connected from top to bottom.

[0034] The horizontal flue 3 is installed on the frame, with one end of the horizontal flue 3 connected to the top of the post-evaporation flue 13 and the other end of the horizontal flue 3 connected to the top of the denitrification flue 21.

[0035] The steam drum 4 is mounted on the frame and located above the horizontal flue 3. The steam drum 4 contains a steam-water separator, and its exterior has a liquid level display device. Manholes are located at both ends of the steam drum 4. The steam-water separator effectively separates steam and liquid water, which then circulate through the steam pipe 41 and downcomer 43, respectively. The liquid level display device shows the liquid level inside the steam drum 4 in real time, allowing for timely replenishment of water through the feed inlet when the level is low. The manholes facilitate personnel access to the interior of the steam drum 4 for maintenance.

[0036] Among them, at least one of the inlet flue 11, the pre-evaporation flue 12, the first superheated flue 14, the second superheated flue 15, the post-evaporation flue 13, the horizontal flue 3, the denitrification flue 21, the first coal-saving flue 22, the second coal-saving flue 23 and the outlet flue 24 is detachably connected to the other adjacent to it. In this embodiment, the pre-evaporation flue 12 is detachably connected to the inlet flue 11, the first superheated flue 14 is detachably connected to the pre-evaporation flue 12, the second superheated flue 15 is detachably connected to the first superheated flue 14, the post-evaporation flue 13 is detachably connected to the second superheated flue 15, the horizontal flue 3 is detachably connected to the post-evaporation flue 13, the denitrification flue 21 is detachably connected to the horizontal flue 3, the first economizing flue 22 is detachably connected to the denitrification flue 21, the second economizing flue 23 is detachably connected to the first economizing flue 22, and the outlet flue 24 is detachably connected to the second economizing flue 23. This allows for the manufacture of an inlet flue 11, a pre-evaporation flue 12, a first superheated flue 14, a second superheated flue 15, a post-evaporation flue 13, a horizontal flue 3, a denitrification flue 21, a first economizing flue 22, a second economizing flue 23, and an outlet flue 24 within the manufacturing plant. These components are then transported to the site for detachable connection and installation on a frame. Compared to a waste heat boiler with an overall suspended water-cooled wall structure, this method reduces the design and construction difficulty of needle coke waste heat boilers, shortens the on-site construction period, improves construction quality, and lowers manufacturing costs.

[0037] During on-site installation, it is only necessary to weld and connect each modular flue in sequence according to the structure of the needle coke waste heat boiler, which is convenient and improves installation efficiency.

[0038] like Figure 1 As shown, the inlet flue 11, the pre-evaporation flue 12, the first superheated flue 14, the second superheated flue 15, and the post-evaporation flue 13 all include a first vertical flue body 101. At least one of the inlet flue 11, the pre-evaporation flue 12, the first superheated flue 14, the second superheated flue 15, and the post-evaporation flue 13 includes an internal heat insulation member 102, which is disposed on the inner wall of the first vertical flue body 101. In this embodiment, the inlet flue 11, the pre-evaporation flue 12, the first superheated flue 14, the second superheated flue 15, and the post-evaporation flue 13 are all provided with internal heat insulation members 102. Therefore, the internal heat insulation member 102 can prevent the high temperature of the flue gas in the first vertical flue 1 from being conducted to the first vertical flue body 101, avoiding excessive expansion of the first vertical flue body 101 due to high temperature, and also reducing the requirements for high-temperature resistance of the material of the first vertical flue body 101.

[0039] like Figure 1 As shown, the denitrification flue 21, the first economizing flue 22, the second economizing flue 23, and the outlet flue 24 all include a second vertical flue body 201. At least one of the denitrification flue 21, the first economizing flue 22, the second economizing flue 23, and the outlet flue 24 includes an external insulation component 202, which covers the outer wall of the second vertical flue body 201. In this embodiment, the denitrification flue 21, the first economizing flue 22, the second economizing flue 23, and the outlet flue 24 all include an external insulation component 202. This external insulation component 202 prevents heat loss from the flue gas within the second vertical flue 2, thereby avoiding corrosion of the second vertical flue body 201, facilitating maintenance and replacement, reducing boiler heat loss, and reducing flue weight.

[0040] like Figure 1 As shown, the pre-evaporation flue 12, the post-evaporation flue 13, the denitrification flue 21, and the second coal-saving flue 23 are all fixed to the frame by fasteners 5.

[0041] like Figure 1 As shown, the first superheated flue 14, the second superheated flue 15, and the first economizing flue 22 are all connected to the frame via elastic members 6, which are placed vertically. The elastic members 6 buffer the expansion displacement of the first superheated flue 14, the second superheated flue 15, and the first economizing flue 22. When the first superheated flue 14, the second superheated flue 15, and the first economizing flue 22 expand in volume under high-temperature conditions, fine-tuning of their positions is achieved through the stretching or compression of the elastic members 6.

[0042] like Figure 1 As shown, the first vertical flue 1 further includes a first expansion joint 16. The first expansion joint 16 is connected between the first superheated flue 14 and the second superheated flue 15. Thus, by compressing the first expansion joint 16, the requirement for volume expansion of the first superheated flue 14 and the second superheated flue 15 under high-temperature conditions can be met.

[0043] like Figure 1 As shown, the second vertical flue 2 also includes a second expansion joint 25, which connects the denitrification flue 21 and the first economizing flue 22. This allows the first expansion joint 16 to be compressed to meet the volume expansion requirements of the first economizing flue 22 under high-temperature conditions.

[0044] like Figure 1As shown, the inlet flue duct 11 has a flue gas inlet, the pre-evaporation flue duct 12 has a pre-evaporator 121, the first superheated flue duct 14 has a first superheater 141, the second superheated flue duct 15 has a second superheater 151, the post-evaporation flue duct 13 has a post-evaporator 131, the first economizer flue duct 22 has a first economizer 221, the second economizer flue duct 23 has a second economizer 231, and the outlet flue duct 24 has a flue gas outlet. The flue gas enters through the flue gas inlet and then exits through the flue gas outlet to the downstream flue gas desulfurization unit. The inlet of the second economizer 231 is connected to the water supply outlet, the outlet of the second economizer 231 is connected to the inlet of the first economizer 221, the outlet of the first economizer 221 is connected to the inlet of the steam drum 4, the outlet of the steam drum 4 is connected to the inlet of the post-evaporator 131 and the inlet of the pre-evaporator 121, the outlets of the post-evaporator 131 and the pre-evaporator 121 are both connected to the inlet of the steam drum 4, the steam outlet of the steam drum 4 is connected to the inlet of the second superheater 151, the outlet of the second superheater 151 is connected to the inlet of the first superheater 141, and the outlet of the first superheater 141 is connected to the user pipeline.

[0045] like Figure 1 As shown, the inlet of the second economizer 231 is located below its outlet, the inlet of the first economizer 221 is located below its outlet, the inlet of the post-evaporator 131 is located below its outlet, and the inlet of the pre-evaporator 121 is located below its outlet.

[0046] like Figure 1 As shown, the air inlet of the second superheater 151 is located above its air outlet, and the air inlet of the first superheater 141 is located below its air outlet. By positioning the air inlet of the second superheater 151 above its air outlet, the impact of high-temperature flue gas on the first superheater 141 can be effectively prevented, thus avoiding high-temperature rupture of the pipes in the first superheater 141.

[0047] like Figure 1 , Figure 2 As shown, the needle coke waste heat boiler also includes a feedwater preheater 7. The feedwater preheater 7 is a shell-and-tube heat exchanger. The tube-side inlet 71 of the feedwater preheater 7 is connected to the feedwater inlet, the tube-side outlet 72 of the feedwater preheater 7 is connected to the inlet of the second economizer 231, the outlet of the second economizer 231 is connected to the shell-side inlet 73 of the feedwater preheater 7, and the shell-side outlet 74 of the feedwater preheater 7 is connected to the inlet of the first economizer 221.

[0048] By installing a feedwater preheater 7 near the outlet flue 24, the waste heat from the flue gas at the outlet flue 24 can be further absorbed. The first economizer 221, the second economizer 231, and the feedwater preheater 7 constitute the boiler feedwater preheating system. Boiler feedwater is transported to the second economizer 231 through the feedwater pipe of the feedwater preheater 7 for heating, and then enters the shell side of the feedwater preheater 7 through the shell-side inlet 73. In the shell side, the water in the tube side is preheated to 104°C, which is above the flue gas dew point temperature, thus preventing low-temperature acid dew point corrosion in the second economizer 231. After heat exchange with the water in the tube side, the water in the shell side flows to the first economizer 221 through the shell-side outlet 74 for further heating, and then flows into the steam drum 4 through the water supply pipe 44.

[0049] The needle coke waste heat boiler also includes a cooling device (not shown in the figure). The cooling device is located between the outlet of the second superheater 151 and the inlet of the first superheater 141, or at the outlet of the first superheater 141. The cooling device includes a spray system, which cools the steam-containing pipeline by spraying it. The cooling device is used to regulate the temperature of the steam output from the outlet of the first superheater 141, preventing the steam temperature from becoming too high.

[0050] like Figure 1 As shown, a dust removal device 31 is provided on the horizontal flue 3. The dust removal device 31 can remove dust from the flue gas in the horizontal flue 3.

[0051] like Figure 1 As shown, the needle coke waste heat boiler also includes a horizontal auxiliary flue 8. One end of the horizontal auxiliary flue 8 is connected to the top of the post-evaporation flue 13, and the other end of the horizontal flue 8 is connected to the top of the denitrification flue 21. A butterfly valve 81 is provided on the horizontal auxiliary flue 8.

[0052] When butterfly valve 81 is closed, dust removal device 31 starts; when dust removal device 31 is closed, butterfly valve 81 opens. During normal operation of dust removal device 31, butterfly valve 81 is closed, and dust removal is performed using dust removal device 31. In case of malfunction or maintenance of dust removal device 31, butterfly valve 81 can be opened for continued operation, thus eliminating the need to shut down the entire equipment for maintenance.

[0053] like Figure 1 As shown, a funnel-shaped dust collection and ash removal device 111 is provided at the bottom of the inlet flue 11. The collected dust can be removed by opening the funnel-shaped dust collection and ash removal device 111.

[0054] like Figure 1As shown, the denitrification flue duct 21 includes, from top to bottom, an ammonia injection assembly 211, a flow straightener 212, and a denitrification assembly 213. The ammonia injection assembly 211 includes ammonia injection nozzles, which, through their agitation, ensure uniform mixing of ammonia and flue gas, thus guaranteeing the efficiency of flue gas denitrification. The flow straightener 212 ensures uniform flue gas flow, promotes further mixing of ammonia and flue gas, and improves the reaction efficiency of flue gas denitrification. The denitrification assembly 213, serving as the reaction structure for the denitrification catalyst, includes a flue gas flow-blocking sealing structure, a catalyst support mesh plate, a denitrification catalyst, and a catalyst maintenance and loading door. The catalyst support mesh plate is located within the flue gas flow-blocking sealing structure, the denitrification catalyst is located on the catalyst support mesh plate, and the catalyst maintenance and loading door is located on the flue gas flow-blocking sealing structure.

[0055] The first superheater 141 and the second superheater 151 are extended finned tube structures, which can effectively increase the heating area and reduce the height and weight of the entire boiler equipment. The first superheater 141 and the second superheater 151 form a superheated steam system, realizing the transformation of boiler steam from saturated steam to superheated steam.

[0056] Among them, the heating surfaces of the first economizer 221 and the second economizer 231 adopt a spiral finned tube structure, which can effectively expand the heat exchange area and save energy and reduce emissions.

[0057] In some embodiments, the operating pressure of the needle coke waste heat boiler is approximately 10 kPa. Reinforcing ribs can be installed on each flue according to actual conditions to enable the needle coke waste heat boiler to withstand the internal pressure and prevent flue gas leakage.

[0058] This embodiment of the application, by setting a pre-evaporation flue 12 at the inlet flue 11, can utilize the pre-evaporator 121 within the pre-evaporation flue 12 to quickly absorb the heat of the flue gas at the inlet flue 11, effectively reducing the temperature and lowering the high-temperature resistance requirements at the flue gas inlet. The pre-evaporator 121 is a linear pipe, and its heating surface is inclined to the horizontal plane. Using the pre-evaporator 121 within the pre-evaporation flue 12 can reduce the flue gas temperature entering the first superheater 141, preventing the first superheater 141 from overheating, protecting the first superheater 141, extending its service life, and mitigating high-temperature corrosion.

[0059] In this embodiment of the application, a water preheater 7 is installed at the outlet flue 24 to further absorb the waste heat of the flue gas at the outlet flue 24.

[0060] In this embodiment, a boiler feedwater preheating system is formed by a first economizer 221, a second economizer 231, and a feedwater preheater 7. After being heated by the boiler feedwater preheating system, the boiler feedwater flows into the steam drum 4 for makeup water. The condensate in the steam drum 4 flows into the pre-evaporator 121 and the post-evaporator 131 through the downcomer 43, respectively. After being heated by high-temperature flue gas, saturated steam is formed. The saturated steam flows back to the steam drum 4 through the riser 42, forming a complete water circulation, which can make full use of the heat of the waste flue gas and has a high heat recovery efficiency.

[0061] In this embodiment, water enters the second economizer 231 from the feed inlet for preheating, and then enters the shell side of the feed water preheater 7. The water in the shell side preheats the water in the tube side. After heat exchange between the water in the shell side and the water in the tube side, the water enters the first economizer 221 for heating, and then enters the steam drum 4 through the water supply pipe. The water in the steam drum 4 flows into the pre-evaporator 121 and the post-evaporator 131 through the downcomer 43, and is heated by high-temperature flue gas to form saturated steam. The saturated steam flows back to the steam drum 4 through the riser 42. The saturated steam enters the second superheater 151 through the steam pipe 41 for initial heating, and then enters the first superheater 141 for reheating to form superheated steam. The superheated steam is delivered to the pipeline through the outlet of the first superheater 141.

[0062] The above provides a detailed description of a needle-shaped coke waste heat boiler provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A needle-shaped coke waste heat boiler, characterized in that, include: frame; The first vertical flue (1) is installed on the frame. The first vertical flue (1) includes an inlet flue (11), a front evaporation flue (12), a superheated flue and a rear evaporation flue (13) connected sequentially from bottom to top. The second vertical flue (2) is installed on the frame and spaced apart from the first vertical flue (1). The second vertical flue (2) includes a denitrification flue (21), an economizing flue, and an outlet flue (24) connected sequentially from top to bottom. A horizontal flue (3) is installed on the frame. One end of the horizontal flue (3) is connected to the top of the rear evaporation flue (13), and the other end of the horizontal flue (3) is connected to the top of the denitrification flue (21). A steam drum (4) is installed on the frame and located above the horizontal flue (3); Among them, at least one of the inlet flue (11), the pre-evaporation flue (12), the superheated flue, the post-evaporation flue (13), the horizontal flue (3), the denitrification flue (21), the economizing flue and the outlet flue (24) is detachably connected to the other adjacent one.

2. The needle-shaped coke waste heat boiler as described in claim 1, characterized in that, The inlet flue (11), the pre-evaporation flue (12), the superheated flue, and the post-evaporation flue (13) all include a first vertical flue body (101); At least one of the inlet flue (11), the pre-evaporation flue (12), the superheated flue, and the post-evaporation flue (13) includes an internal heat insulation member (102), which is disposed on the inner wall of the first vertical flue body (101).

3. The needle-shaped coke waste heat boiler as described in claim 1, characterized in that, The denitrification flue (21), the coal-saving flue, and the outlet flue (24) all include a second vertical flue body (201); At least one of the denitrification flue (21), the economizing flue, and the outlet flue (24) includes an external insulation component (202) which covers the outer wall of the second vertical flue body (201).

4. The needle-shaped coke waste heat boiler as described in claim 1, characterized in that, The superheated flue includes a first superheated flue (14) and a second superheated flue (15) connected from bottom to top; The coal-saving flue includes a first coal-saving flue (22) and a second coal-saving flue (23) connected from top to bottom.

5. The needle-shaped coke waste heat boiler as described in claim 4, characterized in that, The pre-evaporation flue (12), the post-evaporation flue (13), the denitrification flue (21), and the second coal-saving flue (23) are all fixed to the frame by fasteners (5).

6. The needle-shaped coke waste heat boiler as described in claim 4, characterized in that, The first superheated flue (14), the second superheated flue (15) and the first economizing flue (22) are all connected to the frame by elastic members (6), which are placed vertically.

7. The needle-shaped coke waste heat boiler as described in claim 4, characterized in that, The first vertical flue (1) further includes: a first expansion joint (16), which is connected between the first superheated flue (14) and the second superheated flue (15); The second vertical flue (2) further includes a second expansion joint (25), which is connected between the denitrification flue (21) and the first coal-saving flue (22).

8. The needle-shaped coke waste heat boiler as described in claim 4, characterized in that, The inlet flue (11) is provided with a flue gas inlet, the pre-evaporation flue (12) is provided with a pre-evaporator (121), the first superheated flue (14) is provided with a first superheater (141), the second superheated flue (15) is provided with a second superheater (151), the rear evaporation flue (13) is provided with a rear evaporator (131), the first economizer flue (22) is provided with a first economizer (221), the second economizer flue (23) is provided with a second economizer (231), and the outlet flue (24) is provided with a flue gas outlet. The inlet of the second economizer (231) is connected to the water supply outlet, the outlet of the second economizer (231) is connected to the inlet of the first economizer (221), the outlet of the first economizer (221) is connected to the inlet of the steam drum (4), the outlet of the steam drum (4) is connected to the inlet of the post-evaporator (131) and the inlet of the pre-evaporator (121), the outlet of the post-evaporator (131) and the outlet of the pre-evaporator (121) are both connected to the inlet of the steam drum (4), the steam outlet of the steam drum (4) is connected to the inlet of the second superheater (151), the outlet of the second superheater (151) is connected to the inlet of the first superheater (141), and the outlet of the first superheater (141) is connected to the user pipeline.

9. The needle-shaped coke waste heat boiler as described in claim 8, characterized in that, The inlet of the second economizer (231) is located below its outlet, the inlet of the first economizer (221) is located below its outlet, the inlet of the post-evaporator (131) is located below its outlet, the inlet of the pre-evaporator (121) is located below its outlet, the inlet of the second superheater (151) is located above its outlet, and the inlet of the first superheater (141) is located below its outlet.

10. The needle-shaped coke waste heat boiler as described in claim 8, characterized in that, The needle-shaped coke waste heat boiler also includes: a feedwater preheater (7), wherein the feedwater preheater (7) is a shell-and-tube heat exchanger; The tube-side inlet (71) of the feedwater preheater (7) is connected to the feedwater inlet, the tube-side outlet (72) of the feedwater preheater (7) is connected to the inlet of the second economizer (231), the outlet of the second economizer (231) is connected to the shell-side inlet (73) of the feedwater preheater (7), and the shell-side outlet (74) of the feedwater preheater (7) is connected to the inlet of the first economizer (221).

11. The needle-shaped coke waste heat boiler as described in claim 8, characterized in that, The needle-shaped coke waste heat boiler further includes a cooling device, which is disposed between the outlet of the second superheater (151) and the inlet of the first superheater (141), or the cooling device is disposed at the outlet of the first superheater (141).

12. The needle-shaped coke waste heat boiler as described in claim 1, characterized in that, A dust removal device (31) is provided on the horizontal flue (3).

13. The needle-shaped coke waste heat boiler as described in claim 1, characterized in that, The needle-shaped coke waste heat boiler further includes: a horizontal auxiliary flue (8), one end of which is connected to the top of the post-evaporation flue (13), and the other end of which is connected to the top of the denitrification flue (21). A butterfly valve (81) is provided on the horizontal auxiliary flue (8).

14. The needle-shaped coke waste heat boiler as described in claim 1, characterized in that, The denitrification flue (21) includes an ammonia injection assembly (211), a rectifier grid (212), and a denitrification assembly (213) arranged sequentially from top to bottom.

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