Ascending pipe waste heat gas heating device

Abstract

The utility model relates to the technical field of coking equipment, in particular to an ascending pipe waste heat gas heating device. Comprising a riser body, a gas inlet branch pipe, a gas inlet header pipe, a gas outlet branch pipe and a gas outlet header pipe, the riser body is of a vertical structure and comprises an inner barrel, an outer barrel and fins, the inner barrel is arranged in the outer barrel, a cavity is formed between the inner barrel and the outer barrel to form a jacket, and the fins are fixedly connected to the outer wall of the inner barrel and located in the jacket; the upper part of the riser body is a raw gas outlet; one end of the gas inlet branch pipe is fixedly connected to the outer cylinder and communicated with the jacket, and the other end of the gas inlet branch pipe is communicated with the gas inlet header pipe; one end of the gas outlet branch pipe is fixedly connected to the outer cylinder and communicated with the jacket, and the other end of the gas outlet branch pipe is communicated with the gas outlet header pipe. A heat exchange medium is coal gas which is heated by raw coke oven gas, so that the temperature of the coal gas is increased, and the coal gas consumption for coke oven heating is reduced.

Description

Technical Field

[0001] This utility model relates to the field of coking equipment technology, specifically to a device for heating coal gas using waste heat from a riser pipe. Background Technology

[0002] The heat loss during the coking process mainly consists of four parts: sensible heat from the red coke exiting the furnace, sensible heat from the raw coal gas, sensible heat from the coke oven flue gas, and heat dissipation from the furnace surface. The temperature of the raw coal gas in the coke oven is approximately 650–750℃, and its sensible heat accounts for about 36% of the heat distribution in the coke oven.

[0003] Currently, the coking industry treats raw coal gas by spraying a certain amount of circulating ammonia water at 70-75℃. As the circulating ammonia water absorbs heat and evaporates, the temperature of the raw coal gas decreases, making it suitable for recovery and processing by the chemical production section. This process results in a significant waste of the sensible heat of the raw coal gas.

[0004] Coke oven gas waste heat utilization technology is an environmentally friendly new technology that recovers the sensible heat of raw coal gas to achieve energy conservation, emission reduction, and economic benefits. However, during the application of coke oven riser pipe waste heat utilization technology, deformation and leakage are prone to occur. Moreover, when the above problems occur, it is impossible to prevent the working fluid from entering the coke oven carbonization chamber, which cannot ensure the safety and stability of coke oven production. At the same time, it is impossible to effectively control the inner wall temperature of the riser pipe evaporator (≥450℃), and it is impossible to avoid the temperature zone where a large amount of tar condenses, which can easily cause tar and graphitization to block the riser pipe and the resulting environmental problems (smoke). Utility Model Content

[0005] To overcome the shortcomings of the prior art, this utility model provides a gas heating device using waste heat from a riser pipe. The heat exchange medium is gas, which heats the gas using raw coal gas, thereby increasing the gas temperature and reducing the amount of gas used for heating the coke oven.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A gas heating device using a riser pipe with waste heat includes a riser pipe body, a gas inlet branch pipe, a gas inlet main pipe, a gas outlet branch pipe, and a gas outlet main pipe. The riser pipe body is a vertical structure, including an inner cylinder, an outer cylinder, and fins. The inner cylinder is located inside the outer cylinder, and a cavity forms a jacket between the inner and outer cylinders. The fins are fixed to the outer wall of the inner cylinder and located within the jacket. The lower part of the riser pipe body is the raw gas inlet, and the upper part is the raw gas outlet. One end of the gas inlet branch pipe is fixed to the outer cylinder and communicates with the jacket, while the other end is connected to the gas inlet main pipe. One end of the gas outlet branch pipe is fixed to the outer cylinder and communicates with the jacket, while the other end is connected to the gas outlet main pipe.

[0008] Furthermore, it also includes flanges, which are jacketed flanges, and are fixedly connected to the upper and lower ends of the riser pipe body.

[0009] Furthermore, it also includes an ultrasonic descaling device, which includes a main unit, cable, transducer and waveguide. The waveguide is fixed to the flange. The ultrasonic descaling device is used to remove impurities on the inner cylinder and the inner wall of the flange.

[0010] Furthermore, it also includes an insulation layer, which is installed on the outside of the outer cylinder.

[0011] Furthermore, an expansion joint is provided in the middle of the outer cylinder.

[0012] Furthermore, the fins are helical fins.

[0013] Furthermore, a gas inlet valve is provided on the gas inlet branch pipe.

[0014] Furthermore, a gas outlet valve is provided on the gas outlet branch pipe.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1) The riser pipe body of this utility model has a vertical structure, including an outer cylinder, an inner cylinder, and fins fixed to the inner cylinder. The cavity between the outer and inner cylinders is a jacket. The lower part of the riser pipe body is the raw coal gas inlet, and the upper part is the raw coal gas outlet. The coal gas pipeline is connected to the jacket. The heat exchange medium of this utility model is coal gas. Through the above structure, the raw coal gas is used to heat the coal gas, thereby increasing the coal gas temperature and reducing the amount of coal gas used for coke oven heating. The waste heat of the riser pipe is used to heat the coal gas, making full use of the waste heat of the riser pipe. The coal gas pressure is low, the equipment wall thickness is small, and the cost is low.

[0017] 2) In existing technologies, gas preheaters typically use steam to heat the recycled gas. However, the steam is unstable, especially in winter, and may not achieve the desired heating effect, while also increasing steam consumption. This invention utilizes the waste heat from the riser pipe to heat the gas, ensuring that even if there is a leak, it will only leak into the gas and will not cause an explosion. This invention is safe and reliable for heating gas.

[0018] 3) This utility model is equipped with an ultrasonic descaling device, which removes scale and impurities from the inner wall during operation, ensuring stable operation of the equipment.

[0019] 4) The fins of this utility model are spiral fins, which on the one hand increase the flow guiding effect and further enhance heat exchange, and on the other hand greatly increase the heat exchange area and improve the heat exchange effect.

[0020] 5) The outer side of the riser pipe body of this utility model is provided with a heat insulation layer. This reduces the heat loss inside the riser pipe body and achieves the effect of energy saving. Attached Figure Description

[0021] Figure 1 This is a schematic front view of the structure of this utility model.

[0022] In the diagram: 1. Flange; 2. Inner cylinder; 3. Outer cylinder; 4. Fin; 5. Insulation layer; 6. Expansion joint; 7. Ultrasonic descaling device; 8. Gas inlet valve; 9. Gas inlet branch pipe; 10. Gas inlet main pipe; 11. Gas inlet pipe; 12. Gas outlet pipe; 13. Gas outlet valve; 14. Gas outlet branch pipe; 15. Gas outlet main pipe; 101. Main unit; 102. Cable; 103. Transducer; 104. Waveguide. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can be fixed connections, detachable connections, or integral connections; they can be direct connections or indirect connections through an intermediate medium; and they can be internal connections between two components.

[0026] Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] In the description of this utility model, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0028] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0029] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0030] like Figure 1 As shown, a gas heating device using waste heat from a riser pipe includes a flange 1, a riser pipe body, an ultrasonic descaling device 7, a gas inlet branch pipe 9, a gas inlet main pipe 10, a gas outlet branch pipe 14, and a gas outlet main pipe 15.

[0031] The riser pipe body has a vertical structure, including an inner cylinder 2, an outer cylinder 3, fins 4, and an insulation layer 5. Both the inner cylinder 2 and the outer cylinder 3 are cylindrical with vertical axes. The axes of the inner cylinder 2 and the outer cylinder 3 are the same. The inner cylinder 2 is located inside the outer cylinder 3, and a gap, forming a cavity, is left between the inner cylinder 2 and the outer cylinder 3, creating a jacketed structure. Flange 1 is a jacketed flange, and two flanges 1 are respectively fixed to the upper and lower end faces of the inner cylinder 2 and the outer cylinder 3.

[0032] The inner cylinder 2 is made of seamless steel pipe with a smooth inner wall. Flange 1 is butt-welded to the inner cylinder 2 from the inside, and the weld is ground smooth afterward to ensure a smooth interior and reduce scaling. Flange 1 is butt-welded to the outer cylinder 3 from the outside. Flange 1 and the inner cylinder 2 are in direct contact with the raw coal gas and are made of heat-resistant metal materials.

[0033] The fins 4 are spiral fins, welded to the outer wall of the inner cylinder 3, and evenly distributed on the outer wall of the inner cylinder 3 with the axis of the inner cylinder 3 as the axis. The fins 4 serve two purposes: firstly, to guide the flow and enhance heat transfer; secondly, after being welded to the inner cylinder 3, they are located inside the jacket, increasing the heat transfer area and thus playing a heat transfer role.

[0034] An expansion joint 6 is provided in the middle of the outer cylinder 3. The expansion joint 6 can absorb the axial expansion and contraction of the outer cylinder 3 caused by temperature changes, reduce deformation and leakage at the connection caused by thermal expansion and contraction, thereby extending its service life and also playing a sealing role. The insulation layer 5 is set on the outside of the outer cylinder 3 to reduce the loss of heat from the riser pipe body and achieve energy saving effect.

[0035] The ultrasonic descaling device 7 includes a main unit 101, a high-frequency cable 102, a transducer 103 and a waveguide 104. The waveguide 104 is welded to the flange 1 and installed on the upper and lower flanges 1 respectively to remove impurities from the inner cylinder 2 and the inner wall of the flange 1.

[0036] The gas inlet pipe 11 is horizontally fixed to the side wall of the outer cylinder 3, communicates with the jacket, and is located above the highest point of the fin 4. The right end of the gas inlet pipe 11 is connected to the gas inlet valve 8, the gas inlet valve 8 is connected to the gas inlet branch pipe 9, and the gas inlet branch pipe 9 is connected to the gas inlet main pipe 10.

[0037] The gas outlet pipe 12 is horizontally fixed to the side wall of the outer cylinder 3, communicating with the jacket, and located below the lowest point of the fin 4. The right end of the gas outlet pipe 12 is connected to the gas outlet valve 13, the gas outlet valve 13 is connected to the gas outlet branch pipe 14, and the gas outlet branch pipe 14 is connected to the gas outlet main pipe 15.

[0038] The working principle and process of this utility model specifically include the following steps:

[0039] 1) Raw coal gas enters the riser pipe body from the raw coal gas inlet and flows from bottom to top. Nitrogen is first used to replace the coal gas pipeline side. After nitrogen replacement, the coal gas inlet valve 8 and the coal gas outlet valve 13 are closed.

[0040] 2) After the gas is introduced into the gas inlet main pipe 10, the gas inlet valve 8 and the gas outlet valve 13 are opened. The gas enters the equipment jacket and flows from top to bottom along the fins 4 in the jacket, exchanging heat with the raw gas in a countercurrent flow.

[0041] 3) The fins 4 serve two purposes: firstly, to guide airflow and enhance heat transfer; secondly, to increase the heat transfer area and perform heat transfer.

[0042] 4) The inner walls of the inner cylinder 2 and flange 1 are smooth, reducing the formation of scale such as tar. Simultaneously, the ultrasonic descaling device 7 is activated to remove scale such as tar during operation, ensuring stable equipment operation. The low gas pressure eliminates the risk of internal leakage and does not affect coke oven operation.

[0043] 5) After being heated, the gas enters the gas outlet main pipe 15 for coke oven heating.

[0044] This invention uses coal gas as the heat exchange medium. The structure described above enables the heating of raw coal gas with coal gas, increasing the coal gas temperature and reducing the amount of coal gas used for heating coke ovens. It utilizes the waste heat from the riser pipes to fully leverage this heat. The low coal gas pressure and thin equipment walls result in low cost.

[0045] Existing gas preheaters typically use steam to heat recycled gas, but the steam is unstable, especially in winter, and may not achieve the desired heating effect, while also increasing steam consumption. This invention utilizes the waste heat from the riser pipe to heat the gas; even if there is a leak, it will only leak into the gas and will not cause an explosion. This invention provides a safe and reliable method for heating gas.

[0046] The above description is only a part of the specific embodiments of this utility model. The protection scope of this utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and utility model concept of this utility model, should be included within the protection scope of this utility model.

Claims

1. A gas heating device using waste heat from a riser pipe, characterized in that: It includes the riser pipe body, gas inlet branch pipe, gas inlet main pipe, gas outlet branch pipe and gas outlet main pipe; The riser pipe body is a vertical structure, including an inner cylinder, an outer cylinder and fins. The inner cylinder is located inside the outer cylinder, and there is a cavity between the inner cylinder and the outer cylinder to form a jacket. The fins are fixed to the outer wall of the inner cylinder and located inside the jacket. The lower part of the riser pipe body is the raw coal gas inlet, and the upper part is the raw coal gas outlet. One end of the gas inlet branch pipe is fixed to the outer cylinder and communicates with the jacket, while the other end is connected to the main gas inlet pipe. One end of the gas outlet branch pipe is fixed to the outer cylinder and communicates with the jacket, while the other end is connected to the main gas outlet pipe.

2. The gas heating device using a riser pipe waste heat according to claim 1, characterized in that: It also includes flanges, which are jacketed flanges, and are fixed to the upper and lower ends of the riser pipe body.

3. The gas heating device using a riser pipe waste heat according to claim 1, characterized in that: It also includes an ultrasonic descaling device, which consists of a main unit, cable, transducer and waveguide. The waveguide is fixed to the flange. The ultrasonic descaling device is used to remove impurities from the inner cylinder and the inner wall of the flange.

4. The gas heating device using a riser pipe waste heat according to claim 1, characterized in that: It also includes an insulation layer, which is installed on the outside of the outer cylinder.

5. The gas heating device using a riser pipe waste heat according to claim 1, characterized in that: An expansion joint is provided in the middle of the outer cylinder.

6. The gas heating device using a riser pipe waste heat according to claim 1, characterized in that: The fins are spiral fins.

7. The gas heating device with waste heat from the riser pipe according to claim 1, characterized in that: A gas inlet valve is installed on the gas inlet branch pipe.

8. The gas heating device with waste heat from the riser pipe according to claim 1, characterized in that: A gas outlet valve is installed on the gas outlet branch pipe.

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