Vertical heat recovery coke oven flue gas waste heat recovery system

Abstract

This utility model discloses a vertical heat recovery coke oven flue gas waste heat recovery system, relating to the field of flue gas waste heat recovery technology. The system includes multiple waste heat boilers arranged in parallel, each corresponding to a vertical heat recovery coke oven. Each waste heat boiler is connected to the exhaust port of its corresponding vertical heat recovery coke oven via a boiler inlet flue. A bypass flue is connected at one end to the exhaust port of one of the vertical heat recovery coke ovens and at the other end to a waste heat boiler corresponding to another vertical heat recovery coke oven. Control valves are respectively installed on the boiler inlet flue and the bypass flue, enabling the closure of either the boiler inlet flue or the bypass flue. The vertical heat recovery coke oven flue gas waste heat recovery system provided by this utility model can achieve the recovery of flue gas waste heat and avoid excessive emissions of pollutants.

Description

Technical Field

[0001] This utility model relates to the field of flue gas waste heat recovery technology, and in particular to a vertical heat recovery coke oven flue gas waste heat recovery system. Background Technology

[0002] In the coking industry, vertical heat recovery coke ovens generate large amounts of high-temperature flue gas (typically 800–1000℃) during production. If this high-temperature flue gas is directly emitted without waste heat recovery treatment, it will not only pose a pollution risk due to its non-compliance with environmental standards, but also result in a significant loss of energy, leading to serious energy waste. Therefore, the industry generally requires that high-temperature flue gas undergo heat recovery, desulfurization, and dust removal through a waste heat boiler before being emitted. This ensures efficient utilization of waste heat while guaranteeing that emissions meet standards and reducing energy consumption.

[0003] However, the existing standard configuration of "one boiler, one unit" has significant technical flaws: when a single waste heat boiler fails, the system lacks effective redundancy. In this case, the production system can only use emergency venting, which will result in the complete waste of flue gas waste heat and excessive emissions of pollutants.

[0004] Therefore, there is an urgent need to design a technical solution that can recover waste heat from flue gas and avoid excessive emissions of pollutants. Utility Model Content

[0005] The purpose of this invention is to provide a vertical heat recovery system for coke oven flue gas waste heat recovery, in order to solve the problems existing in the prior art, realize the recovery of flue gas waste heat, and avoid excessive emissions of pollutants.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] This utility model provides a vertical heat recovery system for coke oven flue gas waste heat recovery, comprising:

[0008] Waste gas waste heat boilers are arranged in parallel and correspond one-to-one with multiple vertical heat recovery coke ovens. The waste gas waste heat boilers are connected to the exhaust ports of the corresponding vertical heat recovery coke ovens through boiler inlet flues.

[0009] A bypass flue is provided, with one end connected to the exhaust port of the vertical heat recovery coke oven and the other end connected to the waste heat boiler corresponding to another vertical heat recovery coke oven.

[0010] Control valves are respectively installed on the boiler inlet flue and bypass flue, which can close the boiler inlet flue or bypass flue.

[0011] Preferably, the exhaust port of the vertical heat recovery coke oven is connected to multiple parallel branch flues, and the ends of the multiple branch flues away from the vertical heat recovery coke oven are connected to a mixing flue, which is connected to the corresponding boiler inlet flue.

[0012] Preferably, the multiple waste gas waste heat boilers are arranged in pairs, with each pair including a first waste gas waste heat boiler and a second waste gas waste heat boiler. The first waste gas waste heat boiler is connected to the exhaust port of the first vertical heat recovery coke oven through a boiler inlet flue, and the second waste gas waste heat boiler is connected to the exhaust port of the second vertical heat recovery coke oven through a boiler inlet flue. The first vertical heat recovery coke oven is connected to the second waste gas waste heat boiler through a bypass flue, and the second vertical heat recovery coke oven is connected to the first waste gas waste heat boiler through a bypass flue.

[0013] Preferably, the bypass flue includes a first bypass flue, a second bypass flue, and a third bypass flue; the first bypass flue is connected at both ends to a first vertical heat recovery coke oven and a second vertical heat recovery coke oven, and a control valve is provided at each connection point; the first bypass flue is connected to the side wall of the third bypass flue via the second bypass flue at the position between the two control valves; the third bypass flue is connected at both ends to a first waste gas waste heat boiler and a second waste gas waste heat boiler, and a control valve is provided at each connection point.

[0014] Preferably, the flue gas capacity of the waste heat boiler is 1.4 times the maximum flue gas discharge of the vertical heat recovery coke oven.

[0015] Preferably, the control valve is a high-temperature resistant shut-off valve.

[0016] Preferably, the control valve is signal-connected to a control device, which is capable of controlling the on / off state of each control valve.

[0017] Preferably, when the first or second waste gas waste heat boiler fails, the load of the two vertical heat recovery coke ovens drops to 70%.

[0018] Preferably, when both the first waste gas waste heat boiler and the second waste gas waste heat boiler are operating normally, the control valve on the bypass flue is closed.

[0019] Preferably, when the first or second waste gas waste heat boiler fails, the control valve on the boiler inlet flue at the faulty end is closed, and the vertical heat recovery coke oven corresponding to the faulty end is connected to the waste gas waste heat boiler that has not failed through a bypass flue.

[0020] The present invention achieves the following technical advantages over the prior art:

[0021] Each vertical heat recovery coke oven in this invention is connected to a waste heat boiler via a boiler inlet flue, thereby enabling heat recovery of the flue gas from the vertical heat recovery coke oven. Simultaneously, the exhaust port of the vertical heat recovery coke oven is connected to the corresponding waste heat boiler of the adjacent vertical heat recovery coke oven via a bypass flue. Control valves are installed on both the boiler inlet flue and the bypass flue. When the waste heat boiler malfunctions, the corresponding vertical heat recovery coke oven does not need to stop production. Simply adjusting the opening and closing of the control valve allows the faulty vertical heat recovery coke oven to discharge its high-temperature flue gas through the bypass flue to the functioning waste heat boiler for waste heat recovery. This avoids the direct discharge of high-temperature flue gas from the corresponding vertical heat recovery coke oven when the waste heat boiler malfunctions. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the control valve opening and closing state when both waste gas waste heat boilers of the vertical heat recovery coke oven flue gas waste heat recovery system are working normally in one or some embodiments of this utility model.

[0024] Figure 2 This is a schematic diagram of the control valve opening and closing state of the first waste gas waste heat boiler in the vertical heat recovery coke oven flue gas waste heat recovery system in one or more embodiments of the present invention, when the second waste gas waste heat boiler is working normally and the first waste gas waste heat boiler is malfunctioning.

[0025] Figure 3 This is a schematic diagram of the control valve opening and closing states of the second waste gas waste heat boiler in a vertical heat recovery coke oven flue gas waste heat recovery system in one or more embodiments of this utility model, showing a fault in the second waste gas waste heat boiler and the first waste gas waste heat boiler operating normally.

[0026] In the diagram: 1-First waste gas waste heat boiler, 2-Second waste gas waste heat boiler, 3-First vertical heat recovery coke oven, 4-Second vertical heat recovery coke oven, 5-Boiler inlet flue, 6-First bypass flue, 7-Second bypass flue, 8-Third bypass flue, 9-Control valve, 10-Divider flue, 11-Mixing flue. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] The purpose of this invention is to provide a vertical heat recovery system for coke oven flue gas waste heat recovery, in order to solve the problems existing in the prior art, realize the recovery of flue gas waste heat, and avoid excessive emissions of pollutants.

[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Vertical heat recovery coke ovens are a mature structure in existing technology. Currently, each vertical heat recovery coke oven is equipped with a waste heat boiler for flue gas waste heat recovery. The waste heat boiler is one of the core devices of the vertical heat recovery coke oven system. Its function is to convert the waste heat in the high-temperature flue gas generated during the coking process into steam for power generation or heating, thus realizing energy recovery and utilization. The structure and principle of the waste heat boiler are existing technologies. Once the waste heat boiler fails, the high-temperature flue gas in the vertical heat recovery coke oven cannot be effectively treated for waste heat recovery, which seriously affects production stability, reduces the utilization rate of flue gas waste heat, and if the high-temperature flue gas is directly emitted, it will lead to excessive emissions of pollutants. To solve this problem, this utility model provides a vertical heat recovery coke oven flue gas waste heat recovery system, such as... Figure 1 , Figure 2 and Figure 3As shown, the system includes multiple waste gas heat boilers arranged in parallel, each corresponding to a vertical heat recovery coke oven. The waste gas heat boilers are connected to the exhaust ports of the corresponding vertical heat recovery coke ovens via the boiler inlet flue 5. One end of the bypass flue is connected to the exhaust port of the vertical heat recovery coke oven, and the other end is connected to the waste gas heat boiler corresponding to another vertical heat recovery coke oven. Control valves 9 are respectively installed on the boiler inlet flue 5 and the bypass flue, which can close the boiler inlet flue 5 or the bypass flue. Each vertical heat recovery coke oven in this invention is connected to a waste gas waste heat boiler via a boiler inlet flue 5, thereby enabling heat recovery of the flue gas from the vertical heat recovery coke oven. Simultaneously, the exhaust port of the vertical heat recovery coke oven is connected to the corresponding waste gas waste heat boiler of the adjacent vertical heat recovery coke oven via a bypass flue. Both the boiler inlet flue 5 and the bypass flue are equipped with control valves 9. When the waste gas waste heat boiler malfunctions, the corresponding vertical heat recovery coke oven does not need to stop production. Simply adjusting the opening and closing of the control valve 9 allows the faulty vertical heat recovery coke oven to discharge its high-temperature flue gas through the bypass flue to the functioning waste gas waste heat boiler for waste heat recovery. This avoids the direct discharge of high-temperature flue gas from the corresponding vertical heat recovery coke oven when the waste gas waste heat boiler malfunctions. The control valve 9 of this utility model is a high-temperature resistant shut-off valve, or it can be a solenoid valve made of high-temperature resistant material. The control valve 9 is connected to a control device, which can control the opening and closing of each control valve 9, thereby realizing the connection or closure of each flue. The control device adopts the structure of computers, microcontrollers, etc. in the prior art, and the control principle belongs to the prior art.

[0031] In one embodiment, the exhaust port of the vertical heat recovery coke oven is connected to multiple parallel branch flues 10. The multiple branch flues 10 increase the exhaust area of ​​the vertical heat recovery coke oven, thereby improving the exhaust efficiency. The ends of the multiple branch flues 10 away from the vertical heat recovery coke oven are connected to a mixing flue 11. The mixing flue 11 is connected to the corresponding boiler inlet flue 5. The flue gas discharged from the multiple branch flues 10 is mixed through the mixing flue 11 and then uniformly transported to the corresponding waste heat boiler. This reduces the number of flue gas channels connected to the waste heat boiler. Moreover, the mixed flue gas uniformly enters the waste heat boiler for waste heat recovery, improving the recovery efficiency.

[0032] In one embodiment, multiple waste gas heat boilers are arranged in pairs, each pair including a first waste gas heat boiler 1 and a second waste gas heat boiler 2. Multiple vertical heat recovery coke ovens are also arranged in pairs, each pair including a first vertical heat recovery coke oven 3 and a second vertical heat recovery coke oven 4. The first waste gas heat boiler 1 is connected to the exhaust port of the first vertical heat recovery coke oven 3 through a boiler inlet flue 5, and the second waste gas heat boiler 2 is connected to the exhaust port of the second vertical heat recovery coke oven 4 through a boiler inlet flue 5. The first vertical heat recovery coke oven 3 is connected to the second waste gas heat boiler 2 through a bypass flue, and the second vertical heat recovery coke oven 4 is connected to the first waste gas heat boiler 1 through a bypass flue. To further enhance structural compactness, the bypass flue in this embodiment includes a first bypass flue 6, a second bypass flue 7, and a third bypass flue 8. The first bypass flue 6 is connected at both ends to the first vertical heat recovery coke oven 3 and the second vertical heat recovery coke oven 4, with control valves 9 at each connection point. The first bypass flue 6, located between the two control valves 9, is connected to the side wall of the third bypass flue 8 via the second bypass flue 7. The third bypass flue 8 is connected at both ends to the first waste gas waste heat boiler 1 and the second waste gas waste heat boiler 2, with control valves 9 at each connection point. When both the first waste gas waste heat boiler 1 and the second waste gas waste heat boiler 2 are operating normally, the control valves 9 on the bypass flue are closed, and the high-temperature flue gas from the vertical heat recovery coke ovens enters their respective waste gas waste heat boilers for waste heat recovery before being discharged. When either the first waste gas waste heat boiler 1 or the second waste gas waste heat boiler 2 fails, the control valve 9 on the boiler inlet flue 5 at the faulty end closes. The vertical heat recovery coke oven corresponding to the faulty end connects to the unfailed waste gas waste heat boiler via a bypass flue. The vertical heat recovery coke oven at the faulty end does not need to shut down; its high-temperature flue gas enters the unfailed waste gas waste heat boiler through the bypass flue for waste heat recovery before being discharged. By controlling the opening and closing of multiple control valves 9, the system achieves the function of ensuring uninterrupted production of the associated vertical heat recovery coke oven when a single waste gas waste heat boiler fails, thus improving the reliability of system operation.

[0033] In one embodiment, the flue gas capacity of the waste gas waste heat boiler is 1.4 times the maximum exhaust volume of the vertical heat recovery coke oven. When either the first waste gas waste heat boiler 1 or the second waste gas waste heat boiler 2 fails, the load of both vertical heat recovery coke ovens drops to 70%. The 1.4 times larger flue gas capacity of the waste gas waste heat boiler compared to the maximum exhaust volume of the vertical heat recovery coke oven ensures that when one waste gas waste heat boiler fails, the remaining boiler can simultaneously supply waste heat recovery from the high-temperature flue gas emitted by both vertical heat recovery coke ovens, ensuring safe operation under emergency conditions. To further enhance safety, when one waste gas waste heat boiler fails, both vertical heat recovery coke ovens in the group operate at 70% load, reducing the amount of high-temperature flue gas emitted. Combined with the 1.4 times flue gas treatment capacity design of the waste gas waste heat boiler, a single waste gas waste heat boiler can meet the production needs of both vertical heat recovery coke ovens in the group, ensuring continuous production.

[0034] In this embodiment, when both the first waste gas waste heat boiler 1 and the second waste gas waste heat boiler 2 are operating normally, the control valve 9 on the bypass flue is closed, and both vertical heat recovery coke ovens operate at 100% load. The generated high-temperature flue gas enters its respective matching waste gas waste heat boiler for waste heat recovery and is then discharged. When either the first waste gas waste heat boiler 1 or the second waste gas waste heat boiler 2 fails, both vertical heat recovery coke ovens in the group reduce their operating load to 70%. The control valve 9 on the boiler inlet flue 5 at the faulty end is closed, and the vertical heat recovery coke oven corresponding to the faulty end is connected to the waste gas waste heat boiler that has not failed through the bypass flue. The vertical heat recovery coke oven at the faulty end does not need to stop production; its high-temperature flue gas enters the waste gas waste heat boiler that has not failed through the bypass flue for waste heat recovery and is then discharged.

[0035] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A vertical heat recovery coke oven flue gas waste heat recovery system, characterized by: include: Waste gas waste heat boilers are arranged in parallel and correspond one-to-one with multiple vertical heat recovery coke ovens. The waste gas waste heat boilers are connected to the exhaust ports of the corresponding vertical heat recovery coke ovens through boiler inlet flues. A bypass flue is provided, with one end connected to the exhaust port of the vertical heat recovery coke oven and the other end connected to the waste heat boiler corresponding to another vertical heat recovery coke oven. Control valves are respectively installed on the boiler inlet flue and bypass flue, which can close the boiler inlet flue or bypass flue.

2. The vertical heat recovery coke oven flue gas waste heat recovery system according to claim 1, characterized in that: The exhaust port of the vertical heat recovery coke oven is connected to multiple parallel branch flues. The ends of the multiple branch flues away from the vertical heat recovery coke oven are connected to a mixing flue, which is connected to the corresponding boiler inlet flue.

3. The system for recovery of heat from flue gases of a vertical thermal recovery coke oven as claimed in claim 1 wherein: Multiple waste gas heat boilers are arranged in pairs, each pair including a first waste gas heat boiler and a second waste gas heat boiler. The first waste gas heat boiler is connected to the exhaust port of the first vertical heat recovery coke oven through a boiler inlet flue, and the second waste gas heat boiler is connected to the exhaust port of the second vertical heat recovery coke oven through a boiler inlet flue. The first vertical heat recovery coke oven is connected to the second waste gas heat boiler through a bypass flue, and the second vertical heat recovery coke oven is connected to the first waste gas heat boiler through a bypass flue.

4. The system for recovering waste heat from flue gases of a vertical thermal recovery coke oven as claimed in claim 3, wherein: The bypass flue includes a first bypass flue, a second bypass flue, and a third bypass flue; the first bypass flue is connected at both ends to a first vertical heat recovery coke oven and a second vertical heat recovery coke oven, and a control valve is provided at each connection point; the first bypass flue is connected to the side wall of the third bypass flue through the second bypass flue at the position between the two control valves; the third bypass flue is connected at both ends to a first waste gas waste heat boiler and a second waste gas waste heat boiler, and a control valve is provided at each connection point.

5. The system for recovery of heat from flue gases of a vertical thermal recovery coke oven as claimed in claim 1 wherein: The flue gas capacity of the waste heat boiler is 1.4 times the maximum flue gas output of the vertical heat recovery coke oven.

6. The vertical heat recovery coke oven flue gas waste heat recovery system as claimed in claim 1 wherein: The control valve is a high-temperature resistant shut-off valve.

7. The vertical heat recovery coke oven flue gas waste heat recovery system as claimed in claim 1 wherein: The control valve is connected to a control device, which can control the opening and closing of each control valve.

8. The system for recovery of heat from flue gases of a vertical thermal recovery coke oven as claimed in claim 3 wherein: When the first or second waste gas waste heat boiler fails, the load of the two vertical heat recovery coke ovens drops to 70%.

9. The system for recovery of heat from flue gases of a vertical thermal recovery coke oven as claimed in claim 3 wherein: When both the first and second waste gas waste heat boilers are operating normally, the control valve on the bypass flue is closed.

10. The system for recovery of heat from flue gases of a vertical thermal recovery coke oven as claimed in claim 3 wherein: When the first or second waste gas waste heat boiler fails, the control valve on the boiler inlet flue at the faulty end is closed, and the vertical heat recovery coke oven corresponding to the faulty end is connected to the waste gas waste heat boiler that has not failed through the bypass flue.

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