Waste heat recovery device for ascension pipe of coke oven

Abstract

The invention relates to the technical field of coke oven ascension pipe waste heat recovery, and provides a coke oven ascension pipe waste heat recovery device which is used for being installed on an ascension pipe body to conduct waste heat recovery and comprises an outer sleeve and a waste heat recovery pipe set. The waste heat recovery pipe set is arranged on the periphery of the ascending pipe body in a surrounding mode and located in the outer sleeve. The waste heat recovery pipe set comprises an upper heat exchange ring pipe, a lower heat exchange ring pipe and a main heat exchange pipe, the upper heat exchange ring pipe and the lower heat exchange ring pipe are arranged on the periphery of the ascending pipe body in a surrounding mode, the lower heat exchange ring pipe is provided with a medium inlet, the upper heat exchange ring pipe is provided with a medium outlet, and the two ends of the main heat exchange pipe are communicated with the upper heat exchange ring pipe and the lower heat exchange ring pipe in a one-to-one correspondence mode. The multiple main heat exchange pipes are distributed in the circumferential direction of the outer sleeve. According to the technical scheme, the technical problems that in the prior art, the heat exchange tube set is integrally designed, replacement is difficult, and cost is high are solved.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the technical field of waste heat recovery of coke oven riser pipes, and in particular, to a coke oven riser pipe waste heat recovery device. Background Art

[0002] Coking is a key step in producing coke for steel. During the coking process, the raw gas generated will escape from the riser at the top of the carbonization chamber. The raw gas carries a large amount of sensible heat, which has a high recovery value. At present, the existing technology widely uses a method of setting a spiral heat exchange coil around the wall of the coke oven riser to recover the sensible heat of the raw gas. This method uses the medium in the heat exchange coil (such as water or other heat transfer fluid) to exchange heat with the raw gas, transfer the heat of the raw gas to the medium, and thus realize waste heat recovery.

[0003] However, the existing waste heat recovery method using spiral heat exchange coils has some disadvantages. The heat exchange coil is usually designed as an integrated structure. Although this structure can recover the sensible heat of raw gas to a certain extent, when the heat exchange coil is damaged, on the one hand, the replacement process is extremely difficult. Because it surrounds the wall of the riser and is tightly integrated with the riser, complex operations need to be performed on the entire heat exchange coil during disassembly, and it may even be necessary to dismantle some of the riser-related structures. This not only consumes a lot of manpower, material resources and time, but may also cause damage to the riser during disassembly and reinstallation, affecting its normal use. On the other hand, once damage occurs and needs to be replaced, due to its integrity, the entire coil must be replaced, increasing the replacement cost.

[0004] In summary, the design of the heat exchange tube group in the existing coke oven riser waste heat recovery device is difficult to meet the coking industry's demand for the use of waste heat recovery devices. It is urgent to develop a new type of coke oven riser waste heat recovery device to solve the above problems. Summary of the invention

[0005] In order to overcome the above-mentioned defects, the embodiments of the present disclosure provide a coke oven riser waste heat recovery device, which solves the technical problems in the related art of the integrated design of the heat exchange tube group, the difficulty in replacement and the high cost.

[0006] According to one aspect, at least one embodiment of the present disclosure provides a coke oven riser waste heat recovery device, which is used to be installed on a riser body to recover waste heat, and comprises an outer sleeve and a waste heat recovery pipe group, wherein the outer sleeve is sleeved on the periphery of the riser body, and the waste heat recovery pipe group is arranged around the periphery of the riser body and is located inside the outer sleeve; The waste heat recovery tube group includes an upper heat exchange ring tube, a lower heat exchange ring tube and a main heat exchange tube. The upper heat exchange ring tube and the lower heat exchange ring tube are both arranged outside the outer periphery of the riser tube body. The lower heat exchange ring tube has a medium inlet, and the upper heat exchange ring tube has a medium outlet. Both ends of the main heat exchange tube are connected to the upper heat exchange ring tube and the lower heat exchange ring tube in a one-to-one correspondence. There are multiple main heat exchange tubes and they are distributed circumferentially along the outer sleeve.

[0007] For example, at least one embodiment of the present disclosure provides a coke oven riser waste heat recovery device, which further includes: The upper heat exchange ring tube is detachably connected to an upper connecting tube, and the lower heat exchange ring tube is detachably connected to a lower connecting tube extending upward, the upper end of the main heat exchange tube is plug-connected and communicated with the upper connecting tube, and the lower end of the main heat exchange tube is plug-connected and communicated with the lower connecting tube, and the upper connecting tube and the lower connecting tube are configured to be able to be released from the main heat exchange tube by moving so as to remove the main heat exchange tube.

[0008] For example, at least one embodiment of the present disclosure provides a coke oven riser waste heat recovery device, which further includes: The outer sleeve includes two upper and lower flange cover plates and a rotating drum in the middle. The upper and lower flange cover plates are installed on the outer periphery of the riser tube body. The rotating drum is rotatably arranged on the two flange cover plates. The rotating drum has an inspection port. An inspection door is slidably arranged on the rotating drum. The inspection door is used to control the opening and closing of the inspection port. The inspection port is configured to be able to align with different main heat exchange tubes under the drive of the rotating drum.

[0009] For example, at least one embodiment of the present disclosure provides a coke oven riser waste heat recovery device, which further includes: It also includes a raw gas exchange tube group, which includes two main exchange tubes and a pump body. Both ends of the main exchange tubes are inserted through the riser tube body, and both ends of the main exchange tubes are located at the top and bottom of the riser tube body in a one-to-one correspondence. The pump body is arranged in series on one of the main exchange tubes. The two main exchange tubes can form a gas circuit circulation under the action of the pump body to allow the raw gas at the top and bottom of the riser tube body to exchange with each other.

[0010] For example, at least one embodiment of the present disclosure provides a coke oven riser waste heat recovery device, which further includes: The raw gas exchange tube group also includes an exchange ring tube, which is arranged in the riser tube body. There are two exchange ring tubes, which are respectively located at the top and bottom of the riser tube body. A plurality of air vents are distributed circumferentially on the exchange ring tube. The top ends of the two main exchange tubes are connected to the exchange ring tube located at the top, and the bottom ends of the two main exchange tubes are connected to the exchange ring tube located at the bottom. A gas circuit is formed between the two main exchange tubes and the two exchange ring tubes for exchanging the raw gas at the top and bottom of the riser tube body.

[0011] For example, at least one embodiment of the present disclosure provides a coke oven riser waste heat recovery device, which further includes: The main exchange pipe is connected to an ammonia supply box, and the ammonia supply box is used to introduce ammonia into the riser pipe body.

[0012] For example, at least one embodiment of the present disclosure provides a coke oven riser waste heat recovery device, which further includes: The top of the rising tube body is hinged with a cover body that can swing vertically. The center of the cover body has a through hole. A mounting seat is rotatably arranged in the through hole. The center of the mounting seat is provided with a telescopic tube for supplying high-pressure water into the rising tube body to flush the inner peripheral wall of the rising tube body. The peripheral wall of the telescopic tube is provided with multiple water outlet holes. A swivel joint is installed on the top of the telescopic tube, and the swivel joint is used to connect the water supply pipe.

[0013] For example, at least one embodiment of the present disclosure provides a coke oven riser waste heat recovery device, which further includes: A take-up roller is rotatably arranged on the mounting seat, and a take-up and pay-out line connected to the telescopic end of the telescopic tube is wound around the take-up roller. The take-up roller is configured to wind or pay out the take-up and pay-out line to extend or retract the telescopic tube.

[0014] For example, at least one embodiment of the present disclosure provides a coke oven riser waste heat recovery device, which further includes: The waste heat recovery pipe group also includes a gas-liquid separator, which has a liquid inlet, a liquid outlet and a gas outlet. The liquid inlet of the gas-liquid separator is connected to the medium outlet and is used to allow the medium after heat exchange to flow back to the gas-liquid separator. The liquid outlet of the gas-liquid separator is connected to the medium inlet and is used to transport the medium to the medium inlet. The gas outlet of the gas-liquid separator is connected to a superheater, and the superheater is used to heat the saturated steam discharged from the gas-liquid separator into superheated steam.

[0015] For example, at least one embodiment of the present disclosure provides a coke oven riser waste heat recovery device, which further includes: The main heat exchange tube is spiral.

[0016] The beneficial effects of the embodiments of the present disclosure are: In the present disclosure, when the raw coal gas escapes from the riser body during the coking process, a large amount of sensible heat carried by the raw coal gas is transferred to the inside of the outer sleeve through the tube wall of the riser body, and the heat is transferred to the waste heat recovery tube group located inside it. The low-temperature heat exchange medium flows in from the medium inlet of the lower heat exchange ring tube, and then enters each main heat exchange tube. In the main heat exchange tube, the heat exchange medium exchanges heat with the heat conducted through the outer sleeve, and the temperature gradually increases. After absorbing the heat, the heat exchange medium rises along the main heat exchange tube, enters the upper heat exchange ring tube, and finally flows out from the medium outlet of the upper heat exchange ring tube, and is transported to other production links that require heat sources, thereby realizing the recovery and utilization of the waste heat of the raw coal gas.

[0017] When a main heat exchange tube in the waste heat recovery tube group is damaged, since the main heat exchange tube is detachably connected to the upper and lower heat exchange ring tubes, maintenance personnel only need to remove the connecting parts at both ends of the corresponding main heat exchange tube (such as loosening the flange bolts) to remove the damaged main heat exchange tube for replacement. There is no need to dismantle the entire waste heat recovery tube group or the riser body on a large scale. In addition, a single main heat exchange tube is smaller in size and more convenient to replace, which simplifies the replacement process and reduces the difficulty and cost of maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments of the present disclosure. Obviously, the drawings described below are only some exemplary embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on the contents of the exemplary embodiments of the present disclosure and these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the appearance of a coke oven riser waste heat recovery device in one embodiment of the present disclosure; Figure 2 for Figure 1 A schematic diagram of the internal structure of a coke oven riser waste heat recovery device in an embodiment of the present invention; Figure 3 for Figure 1 A schematic structural diagram of an outer sleeve in an embodiment of the present invention; Figure 4 for Figure 1 A schematic structural diagram of a waste heat recovery pipe group in an embodiment of the present invention; Figure 5 for Figure 1 A schematic structural diagram of a raw gas exchange tube group in an embodiment; Figure 6 for Figure 1 Enlarged view of point A in the middle; Figure 7 for Figure 1Schematic diagram of the explosion structure of the cover body in the embodiment; Figure 8 for Figure 1 Schematic diagram of the connection between the waste heat recovery pipe group and the gas-liquid separator in the embodiment.

[0020] Figure 5 The direction of the arrow in the middle is the flow direction of the raw gas.

[0021] In the figure: 1, rising pipe body, 2, outer sleeve, 3, waste heat recovery pipe group, 301, upper heat exchange ring pipe, 302, lower heat exchange ring pipe, 303, main heat exchange pipe, 3021, medium inlet, 3011, medium outlet, 304, upper connecting pipe, 305, lower connecting pipe, 4, rotating drum, 401, inspection port, 402, inspection door, 5, raw gas exchange pipe group, 501, main exchange pipe, 502 , pump body, 503, exchange ring pipe, 5031, air vent, 504, ammonia supply box, 6, cover body, 601, through hole, 7, mounting seat, 8, telescopic tube, 801, water outlet, 9, rotary joint, 10, water supply pipe, 11, take-up roller, 12, take-up and pay-off wire, 13, gas-liquid separator, 1301, liquid inlet, 1302, liquid outlet, 1303, air outlet, 14, superheater. DETAILED DESCRIPTION

[0022] The present disclosure is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure, rather than to limit the present disclosure.

[0023] In order to simplify the drawings, only the parts related to the disclosure are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0024] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0025] In the present disclosure, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] In the description of this embodiment, terms such as "up", "down", "left", and "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, 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 understood as a limitation on the present disclosure.

[0027] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0028] like Figure 1 to Figure 8 As shown, in this embodiment, in order to solve the problems of difficulty in replacement and high cost caused by the integrated design of the heat exchange coil in the existing coke oven riser waste heat recovery device, a waste heat recovery device is designed to achieve waste heat recovery and convenient maintenance through an outer sleeve 2 and a modular waste heat recovery pipe group 3.

[0029] The outer sleeve 2 is cylindrical as a whole, and its inner diameter is larger than the outer diameter of the riser body 1, and there is a gap between the two to accommodate the waste heat recovery pipe group 3. The outer sleeve 2 is sleeved on the outer wall of the riser body 1 by bolt connection. The upper heat exchange ring pipe 301 and the lower heat exchange ring pipe 302 are both annular pipes. The lower heat exchange ring pipe 302 is arranged in the outer sleeve 2 and surrounds the lower position of the outer wall of the riser body 1. The lower heat exchange ring pipe 302 is provided with a medium inlet 3021 for introducing a low-temperature heat exchange medium so that it absorbs the heat transferred by the riser body 1 during the flow in the pipe. The upper heat exchange ring pipe 301 is also arranged in the outer sleeve 2 and surrounds the upper position of the outer wall of the riser body 1. The upper heat exchange ring pipe 301 is provided with a medium outlet 3011 for transporting the heat medium after absorbing the heat, and finally providing a heat source for other production links. The two ends of the main heat exchange pipe 303 are detachably connected to the upper heat exchange ring pipe 301 and the lower heat exchange ring pipe 302 respectively. There are multiple main heat exchange tubes 303, which are evenly distributed along the circumference of the outer sleeve 2. The main heat exchange tubes 303 are connected in a detachable manner, such as by flange connection, threaded connection or quick connector connection, etc. These connection methods are not only easy to install and disassemble, but also have good sealing performance and can prevent medium leakage.

[0030] When the raw gas escapes from the riser body 1 during the coking process, a large amount of sensible heat carried by the raw gas is transferred to the inside of the outer sleeve 2 through the tube wall of the riser body 1, and the heat is transferred to the waste heat recovery tube group 3 located inside it. The low-temperature heat exchange medium flows in from the medium inlet 3021 of the lower heat exchange ring tube 302, and then enters each main heat exchange tube 303. In the main heat exchange tube 303, the heat exchange medium exchanges heat with the heat conducted through the outer sleeve 2, and the temperature gradually increases. After absorbing the heat, the heat exchange medium rises along the main heat exchange tube 303, enters the upper heat exchange ring tube 301, and finally flows out from the medium outlet 3011 of the upper heat exchange ring tube 301, and is transported to other production links that require heat sources, thereby realizing the recovery and utilization of the waste heat of the raw gas.

[0031] When a main heat exchange tube 303 in the waste heat recovery tube group 3 is damaged, since the main heat exchange tube 303 and the upper and lower heat exchange ring tubes 302 are connected in a detachable manner, the maintenance personnel only need to remove the connecting parts at both ends of the corresponding main heat exchange tube 303 (such as loosening the flange bolts) to remove the damaged main heat exchange tube 303 for replacement, without large-scale disassembly of the entire waste heat recovery tube group 3 or the riser body 1. In addition, a single main heat exchange tube 303 is smaller in size and more convenient to replace, thereby simplifying the replacement process and reducing the difficulty and cost of maintenance.

[0032] In some examples, such as Figure 1~Figure 4 As shown, in this embodiment, in order to optimize the replacement process of the main heat exchange tube 303, the connection method between the main heat exchange tube 303 and the upper heat exchange ring tube 301 and the lower heat exchange ring tube 302 and the structure of the outer sleeve 2 are designed.

[0033] The upper heat exchange ring tube 301 is movably provided with an upper connecting tube 304, which is specifically provided in a threaded connection. The inner diameter of the upper connecting tube 304 matches the outer diameter of the top end of the main heat exchange tube 303, ensuring that the top end of the main heat exchange tube 303 can be tightly inserted. The lower heat exchange ring tube 302 is also threadedly connected to the lower connecting tube 305, and its inner diameter is also adapted to the outer diameter of the bottom end of the main heat exchange tube 303, so that the bottom end of the main heat exchange tube 303 can be tightly inserted. The two ends of the main heat exchange tube 303 are respectively plugged with the upper connecting tube 304 and the lower connecting tube 305, and a sealing gasket, such as a rubber gasket or a metal sealing ring, is provided at the plug-in position to prevent leakage of the heat exchange medium. The outer sleeve 2 includes two upper and lower flange cover plates and a rotating drum 4 rotatably provided in the middle, an inspection port 401 is provided on the rotating drum 4, and an inspection door 402 is slidably provided on the rotating drum 4. By pushing and pulling the inspection door 402, the opening and closing of the inspection port 401 can be controlled.

[0034] When a main heat exchange tube 303 needs to be replaced, the operator first opens the inspection door 402, and then rotates the drum 4 so that the inspection port 401 on the drum 4 is aligned with the target main heat exchange tube 303. Then the upper connecting tube 304 is rotated to move the upper connecting tube 304 upward to release the connection with the top of the main heat exchange tube 303, and then the lower connecting tube 305 is rotated to move it downward to release the connection with the bottom of the main heat exchange tube 303. At this time, the damaged main heat exchange tube 303 is released from the positioning and can be easily taken out from the inspection port 401 of the drum 4 for replacement. The solution that the drum 4 is rotated so that the inspection port 401 can be aligned with different main heat exchange tubes 303 achieves the effect of being able to replace a main heat exchange tube 303 without disassembling the drum 4.

[0035] In some examples, such as Figure 1 , Figure 2 and Figure 5 As shown, during the coking process in the coke oven, the raw gas at the lower part of the riser is in a high temperature environment, and the hydrocarbon substances therein are prone to thermal decomposition, and the generated solid particles such as carbon black are easy to adhere to the inner wall of the riser to form coke; while the raw gas at the higher part gradually decreases in temperature, and impurities such as tar and naphthalene in the gas will condense and precipitate, and are easy to adhere to the inner wall of the riser to accumulate and form coke.

[0036] In this embodiment, in view of the problem that raw gas in the coke oven riser is prone to coking at high and low places, a raw gas exchange tube group 5 is designed to reduce the risk of coking.

[0037] Specifically, two main exchange pipes 501 are provided, and both ends of the main exchange pipes 501 are inserted through the riser body 1, one end is located near the top of the riser body 1, and the other end is located near the bottom. A gas circuit is formed between the two main exchange pipes 501 and the riser body 1. The pump body 502 is arranged in series on the main exchange pipe 501 to provide power for the flow of raw gas in the main exchange pipe 501, thereby realizing the circulation of raw gas.

[0038] By installing two groups of main exchange pipes 501 on both sides of the riser body 1, a gas circuit is formed in the main exchange pipes 501 by utilizing the function of the pump body 502. The high-temperature raw coal gas at the lower part is pumped to the upper part of the riser through one group of main exchange pipes 501, while the low-temperature raw coal gas at the upper part is transported to the lower part through another group of main exchange pipes 501. In this way, the raw coal gas at the upper and lower parts of the riser is continuously exchanged, making the overall temperature distribution in the riser more uniform, alleviating the pyrolysis coking caused by high temperature at the lower part and the condensation precipitation coking caused by low temperature at the upper part.

[0039] In some examples, such as Figure 5As shown, in this embodiment, an exchange ring tube 503 is provided at the top and the bottom of the riser body 1. The exchange ring tube 503 is annular, and a plurality of vents 5031 are evenly distributed along the circumference of the exchange ring tube 503. The top ends of the two main exchange tubes 501 are both connected to the exchange ring tube 503 at the top, and the bottom ends of the two main exchange tubes 501 are both connected to the exchange ring tube 503 at the bottom, so that a circulating gas path connected is formed between the two main exchange tubes 501 and the two exchange ring tubes 503.

[0040] During the coking process of the coke oven, when the pump body 502 is started and drives the raw coal gas to flow in the main exchange pipe 501, the high-temperature raw coal gas at the lower position is transported to the exchange ring pipe 503 at the top through the main exchange pipe 501, and is evenly released to the upper position from multiple vents 5031, thereby more evenly mixing with the low-temperature raw coal gas at the upper position. Similarly, the low-temperature raw coal gas at the upper position is transported to the exchange ring pipe 503 at the bottom through the main exchange pipe 501, and is evenly released to the lower position from multiple vents 5031, thereby mixing with the high-temperature raw coal gas at the lower position.

[0041] In the riser body 1, the coking location is generally the inner wall surface, and in this embodiment, the annular exchange ring tube 503 is designed so that the gas can be closer to the inner wall of the riser body 1 when escaping from the vent hole 5031, thereby ensuring that the raw gas located near the inner wall of the riser body 1 is the raw gas with a more moderate temperature after the high and low temperature mixture, thereby alleviating the problem of coking caused by pyrolysis or condensation precipitation.

[0042] In some examples, such as Figure 1 As shown, in this embodiment, in order to further suppress the coking phenomenon in the coke oven riser, an ammonia supply box 504 is added. The ammonia supply box 504 is used to store ammonia and is connected to the main exchange pipe 501.

[0043] In the coking process of coke ovens, tar in the raw gas is one of the important factors leading to coking. As the temperature and environment change in the riser, the tar is prone to polymerization reaction and gradually forms solid coking material. By connecting the ammonia supply box 504 on the main exchange pipe 501, ammonia is introduced into the riser body 1 in a regular and quantitative manner. After the ammonia enters the riser body 1, it will contact and react with the tar in the raw gas, inhibiting the polymerization process of the tar, thereby ensuring the fluidity of the tar and making it difficult for it to accumulate on the inner wall of the riser to form coking. The method of introducing ammonia can be directly controlled manually, or a conventional control system in the prior art can be used to control the opening or opening time of its valve.

[0044] Ammonia is introduced through the main exchange pipe 501, and can participate in the circulation together with the raw coal gas. On the one hand, ammonia can be fully mixed with the raw coal gas in the main exchange pipe 501, thereby improving the utilization rate of the raw coal gas exchange pipe group 5; on the other hand, with the help of the air vents 5031 on the exchange ring pipe 503, ammonia can effectively act on the inner wall of the riser body 1, so that the ammonia can be fully utilized.

[0045] In some examples, such as Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, in this embodiment, in order to solve the coking problem in the coke oven riser, a retractable and rotatable flushing device is designed at the top of the riser body 1 to ensure the cleanliness of the inner wall of the riser.

[0046] The top of the riser body 1 is swingably provided with a cover body 6 by means of a hinge connection, so that the cover body 6 can realize the opening and closing operation of the riser body 1. A mounting seat 7 is rotatably provided in the through hole 601 in the center of the cover body 6, and a through channel is provided in the center of the mounting seat 7 for installing a telescopic tube 8. The telescopic tube 8 adopts a multi-stage sleeve structure, and each section of the sleeve is nested in sequence. The top with the largest diameter is installed in the channel in the center of the mounting seat 7, and the bottom can extend downward. There are multiple water outlets 801 distributed on the telescopic tube 8. A swivel joint 9 is installed at the top of the telescopic tube 8, and the swivel joint 9 is used to connect the telescopic tube 8 and the water supply pipe 10, so that the telescopic tube 8 can maintain a connected state with the water supply pipe 10 when rotating. The water supply pipe 10 is used to be connected to an external water tank.

[0047] When it is necessary to flush the inner wall of the riser body 1, first control the telescopic tube 8 to extend downward. Then the water supply pipe 10 delivers high-pressure water to the telescopic tube 8 through the rotary joint 9 (the water supply pipe 10 may not be connected to the rotary joint 9 when flushing is not performed), and sprays out from the multiple water outlets 801 on the telescopic tube 8. The telescopic tube 8 can be driven to rotate so that the high-pressure water can be sprayed more evenly on the inner wall of the riser body 1 to flush away the coke attached to the inner wall. When flushing is not required, the telescopic tube 8 is retracted, and the cover body 6 can be opened and closed normally without being hindered by the telescopic tube 8. The telescopic tube 8 does not occupy space after being retracted. The rotational movement of the telescopic tube 8 can be driven by coaxially arranging a pulley or sprocket on the outer circle of the mounting seat 7, and arranging a driving member on the top of the cover body 6, so that the driving member is connected to the pulley or sprocket on the outer circle of the mounting seat 7, thereby driving the mounting seat 7 to rotate and synchronously driving the telescopic tube 8 to rotate. In addition, it is necessary to pay attention to the selection of a driving member dedicated to a high temperature environment.

[0048] In some examples, such as Figure 1 , Figure 2 , Figure 6 and Figure 7As shown, in this embodiment, a take-up roller 11 is rotatably provided on the mounting seat 7 and is located above the mounting seat 7. A latch is slidably provided on the cover body 6, and a positioning hole is processed on the end face of the take-up roller 11 for cooperating with the latch on the cover body 6 to lock the take-up roller 11. The two ends of the take-up and release line 12 are respectively connected to the take-up roller 11 and the bottom end of the telescopic tube 8. Fine holes are provided on the mounting seat 7 to ensure that the take-up and release line 12 can pass through. The height of the riser body 1 is about 8 meters. Generally, various structures above the cover body 6 are operated by temporarily setting up a ladder or using a ladder pre-set on the riser body 1.

[0049] When the telescopic tube 8 needs to be extended, the latch is first pulled out, and then the take-up roller 11 is rotated to release the take-up wire 12. As the take-up wire 12 is released, the telescopic tube 8 extends downward under its own weight. When the telescopic tube 8 is fully extended, the latch is inserted into the positioning hole on the end face of the take-up roller 11 to keep the telescopic tube 8 in the extended position.

[0050] When the telescopic tube 8 needs to be retracted, first pull out the pin, then rotate the take-up roller 11 in the opposite direction, the take-up roller 11 winds the take-up and pay-out line 12, and the take-up roller 11 generates an upward pulling force on the telescopic tube 8, overcoming the deadweight of the telescopic tube 8, and gradually pulling the telescopic tube 8 back. When the telescopic tube 8 is fully retracted, insert the pin into the positioning hole on the end face of the take-up roller 11 to ensure that the telescopic tube 8 remains in the retracted state.

[0051] In some examples, such as Figure 8 As shown in the figure, during the waste heat recovery process of the coke oven riser, the heat exchange fluid medium absorbs the sensible heat of the raw gas and partially vaporizes into saturated steam. Since saturated steam has relatively low temperature and is prone to condensation during transportation, its application scenarios are limited.

[0052] To this end, in this embodiment, the waste heat recovery pipe group 3 also includes a gas-liquid separator 13, and the liquid inlet 1301 of the gas-liquid separator 13 is connected to the medium outlet 3011 of the upper heat exchange ring pipe 301, ensuring that the heat exchange medium flowing out of the waste heat recovery pipe group 3 can enter the gas-liquid separator 13. The liquid outlet 1302 is connected to the medium inlet 3021 of the lower heat exchange ring pipe 302 through a water tank.

[0053] The heat exchange medium discharged from the waste heat recovery pipe group 3 is in a gas-liquid mixed state, which contains saturated steam produced by partial evaporation after being heated by raw coal gas and unevaporated liquid. After the gas-liquid mixture is separated by the gas-liquid separator 13, the liquid is discharged through the liquid outlet 1302 and re-enters the waste heat recovery pipe group 3 for recycling. The saturated steam is discharged through the gas outlet 1303 and enters the superheater 14. The temperature of the saturated steam rises in the superheater 14 and becomes superheated steam with a temperature above 300°C to meet the use requirements of more industrial scenarios.

[0054] By adding a gas-liquid separator 13 to the waste heat recovery pipe group 3, the gas-liquid mixed heat exchange medium can be separated into liquid and saturated steam. The liquid re-participates in the waste heat recovery cycle to ensure the continuity of the waste heat recovery system. After the saturated steam enters the superheater 14, its temperature is increased to become superheated steam. Superheated steam has a higher temperature and enthalpy value, which is not only less likely to produce condensed water during transportation, but also can meet the needs of more high-temperature processes.

[0055] In some examples, such as Figure 4 As shown, in this embodiment, the main heat exchange tube 303 is designed to be spiral, which fully utilizes the space in the riser, prolongs the flow path and time of the heat exchange medium, and thus enhances the heat exchange effect.

[0056] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure rather than to limit it. Although the present disclosure has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, which should be included in the scope of the claims of the present disclosure.

Claims

1. A coke oven riser waste heat recovery device, used to be installed on a riser body (1) to recover waste heat, characterized in that: It comprises an outer sleeve (2) and a waste heat recovery pipe group (3), wherein the outer sleeve (2) is sleeved on the outer circumference of the riser pipe body (1), and the waste heat recovery pipe group (3) is arranged around the outer circumference of the riser pipe body (1) and is located inside the outer sleeve (2); The waste heat recovery tube group (3) comprises an upper heat exchange loop tube (301), a lower heat exchange loop tube (302) and a main heat exchange tube (303); the upper heat exchange loop tube (301) and the lower heat exchange loop tube (302) are both arranged around the outer periphery of the riser tube body (1); the lower heat exchange loop tube (302) has a medium inlet (3021); the upper heat exchange loop tube (301) has a medium outlet (3011); both ends of the main heat exchange tube (303) are connected to the upper heat exchange loop tube (301) and the lower heat exchange loop tube (302) in a one-to-one correspondence; and there are a plurality of main heat exchange tubes (303) distributed circumferentially along the outer sleeve (2).

2. A coke oven riser waste heat recovery device according to claim 1, characterized in that: The upper heat exchange ring tube (301) is detachably connected to an upper connecting tube (304), and the lower heat exchange ring tube (302) is detachably connected to a lower connecting tube (305) extending upwards. The upper end of the main heat exchange tube (303) is plug-connected and communicated with the upper connecting tube (304), and the lower end of the main heat exchange tube (303) is plug-connected and communicated with the lower connecting tube (305). The upper connecting tube (304) and the lower connecting tube (305) are configured to be able to release the plug-in connection with the main heat exchange tube (303) by moving, so as to remove the main heat exchange tube (303).

3. A coke oven riser waste heat recovery device according to claim 2, characterized in that: The outer sleeve (2) comprises two upper and lower flange cover plates and a rotating drum (4) in the middle. The upper and lower flange cover plates are installed on the outer periphery of the riser tube body (1). The rotating drum (4) is rotatably arranged on the two flange cover plates. The rotating drum (4) has an inspection port (401). The rotating drum (4) is slidably provided with an inspection door (402). The inspection door (402) is used to control the opening and closing of the inspection port (401). The inspection port (401) is configured to be able to align with different main heat exchange tubes (303) under the drive of the rotating drum (4).

4. The coke oven riser waste heat recovery device according to claim 1, characterized in that: The invention also comprises a raw gas exchange tube group (5), the raw gas exchange tube group (5) comprising two main exchange tubes (501) and a pump body (502), both ends of the main exchange tubes (501) are inserted through the riser tube (1), the two ends of the main exchange tubes (501) are located at the top and the bottom of the riser tube (1) in a one-to-one correspondence, the pump body (502) is arranged in series on one of the main exchange tubes (501), and the two main exchange tubes (501) can form a gas circuit circulation under the action of the pump body (502) so that the raw gas at the top and the bottom of the riser tube (1) can be exchanged with each other.

5. A coke oven riser waste heat recovery device according to claim 4, characterized in that: The raw gas exchange tube group (5) further comprises an exchange ring tube (503), wherein the exchange ring tube (503) is arranged in the riser tube body (1), and there are two exchange ring tubes (503) respectively located at the top and the bottom of the riser tube body (1). A plurality of vent holes (5031) are distributed along the circumference of the exchange ring tube (503), and the top ends of the two main exchange tubes (501) are both connected to the exchange ring tube (503) located at the top, and the bottom ends of the two main exchange tubes (501) are both connected to the exchange ring tube (503) located at the bottom, and a gas circuit is formed between the two main exchange tubes (501) and the two exchange ring tubes (503) for exchanging the raw gas at the top and the bottom of the riser tube body (1).

6. A coke oven riser waste heat recovery device according to claim 5, characterized in that: The main exchange pipe (501) is connected to an ammonia supply box (504), and the ammonia supply box (504) is used to introduce ammonia into the riser pipe body (1).

7. The coke oven riser waste heat recovery device according to claim 1, characterized in that: The top end of the riser tube (1) is hingedly connected to a cover body (6) capable of vertical swinging. The center of the cover body (6) has a through hole (601). A mounting seat (7) is rotatably arranged in the through hole (601). The center of the mounting seat (7) is provided with a telescopic tube (8) for supplying high-pressure water into the riser tube (1) to flush the inner peripheral wall of the riser tube (1). The peripheral wall of the telescopic tube (8) has a plurality of water outlet holes (801). A swivel joint (9) is installed at the top end of the telescopic tube (8). The swivel joint (9) is used to connect to a water supply pipe (10).

8. The coke oven riser waste heat recovery device according to claim 7, characterized in that: A wire take-up roller (11) is rotatably mounted on the mounting seat (7), and a take-up wire (12) connected to the telescopic end of the telescopic tube (8) is wound around the take-up roller (11). The take-up roller (11) is configured to be able to wind or release the take-up wire (12) so as to extend or retract the telescopic tube (8).

9. The coke oven riser waste heat recovery device according to claim 1, characterized in that: The waste heat recovery pipe group (3) further comprises a gas-liquid separator (13), the gas-liquid separator (13) having a liquid inlet (1301), a liquid outlet (1302) and a gas outlet (1303); the liquid inlet (1301) of the gas-liquid separator (13) is in communication with the medium outlet (3011) and is used to allow the medium after heat exchange to flow back to the gas-liquid separator (13); the liquid outlet (1302) of the gas-liquid separator (13) is in communication with the medium inlet (3021) and is used to transport the medium to the medium inlet (3021); the gas outlet (1303) of the gas-liquid separator (13) is connected to a superheater (14), and the superheater (14) is used to heat the saturated steam discharged from the gas-liquid separator (13) into superheated steam.

10. The coke oven riser waste heat recovery device according to claim 1, characterized in that: The main heat exchange tube (303) is spiral-shaped.

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