Device for heating coal gas by utilizing waste heat of ascending pipe
By designing a gas heating device in the coke oven riser pipe, the problem of deformation and leakage in the utilization of waste heat in the riser pipe is solved, and a safe and reliable gas temperature increase and energy-saving effect are achieved, ensuring the stable operation of the coke oven.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC
- Filing Date
- 2025-03-20
- Publication Date
- 2026-05-12
AI Technical Summary
Existing coke oven riser pipe waste heat utilization technology suffers from deformation and leakage problems, which cause the working fluid to enter the coke oven carbonization chamber, making it impossible to effectively control the temperature, resulting in tar blockage and environmental problems. At the same time, existing heating methods such as steam heating are unstable and waste sensible heat.
Design a device that uses the waste heat of the riser pipe to heat coal gas. Coal gas is used as the heat exchange medium. The coal gas is heated by raw coal gas to increase the coal gas temperature, reduce the amount of coal gas used for heating the coke oven, and remove impurities through the coal gas purging pipe to ensure stable operation of the equipment.
It achieves a safe and reliable increase in gas temperature, reduces the amount of coke oven heating gas used, avoids the instability and waste of sensible heat in steam heating, ensures the stability and safety of the equipment, and reduces costs.
Smart Images
Figure CN224226943U_ABST
Abstract
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 an ascent 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 device for heating coal gas using the waste heat of the riser pipe. The heat exchange medium is coal gas, and the coal gas is heated by raw coal gas to increase the coal gas temperature and reduce the amount of coal gas used for heating the coke oven.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] A device for heating coal gas using waste heat from an ascent pipe includes an ascent pipe body, a coal gas pipe, a coal gas inlet branch pipe, a coal gas inlet main pipe, a coal gas outlet branch pipe, and a coal gas outlet main pipe. The ascent pipe body is a vertical cylindrical body with a raw coal gas inlet at the bottom and a raw coal gas outlet at the top. The coal gas pipe has bends at the top and bottom and a straight section in the middle, forming a cylindrical shape. The coal gas pipe is fixed to the side wall of the ascent pipe body. The coal gas inlet main pipe is located at the top of the device and is connected to the upper end of the coal gas pipe through a coal gas inlet branch pipe. The coal gas outlet main pipe is located at the bottom of the device and is connected to the lower end of the coal gas pipe through a coal gas outlet branch pipe.
[0008] Furthermore, it also includes flanges, which are fixedly connected to the upper and lower ends of the riser pipe body.
[0009] Furthermore, the gas pipe is a vertical pipe connected vertically by 180-degree bends, forming a cylindrical shape; the upper end is the gas inlet, and the lower end is the gas outlet.
[0010] Furthermore, an insulation layer is provided on the outside of the riser pipe body.
[0011] Furthermore, the gas pipe is embedded within the riser pipe body, and the riser pipe body is composed of upper and lower parts fixedly connected as one unit.
[0012] Furthermore, a gas inlet valve is provided on the gas inlet branch pipe; a gas outlet valve is provided on the gas outlet branch pipe.
[0013] Furthermore, it also includes two gas purging pipes: one gas purging pipe is connected at one end to the gas inlet branch pipe and at the other end to the riser pipe body; the other gas purging pipe is connected at one end to the gas outlet branch pipe and at the other end to the riser pipe body.
[0014] Furthermore, the upper and lower parts of the riser pipe body are respectively opened between the gas pipes, and a semi-ring pipe is fixedly connected to the outside to connect the gas purging pipe, forming a gas cavity; a semi-pipe is fixedly connected inside the opening, and the gas in the gas cavity blows up and down along the semi-pipe through the opening to purge the scale inside the riser pipe body.
[0015] Furthermore, the gas purging pipe is equipped with a purging pipe valve.
[0016] Compared with the prior art, the beneficial effects of this utility model are:
[0017] 1) The riser body of this utility model is a vertical cylindrical body, with a raw coal gas inlet at the bottom and a raw coal gas outlet at the top. The upper and lower ends of the coal gas pipe are bent to form a cylindrical shape and fixed to the side wall of the riser body. The main coal gas inlet pipe is located at the top of the device and is connected to the upper end of the coal gas pipe through a coal gas inlet branch pipe. The main coal gas outlet pipe is located at the bottom of the device and is connected to the lower end of the coal gas pipe through a coal gas outlet branch pipe. 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.
[0018] 2) In existing technologies, gas preheaters typically use steam to heat recycled gas. However, the steam is unstable, especially in winter, and fails to 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 a leak occurs, it will only leak into the gas and will not cause an explosion. This invention provides a safe and reliable method for heating gas.
[0019] 3) This utility model is equipped with a gas purging pipe. By purging with gas, impurities such as graphite inside the main body of the riser pipe are removed. It is simple and reliable, does not affect the operation of the coke oven, and ensures the stable operation of the equipment.
[0020] 4) In this utility model, the gas pipe is embedded inside the riser pipe body, and the riser pipe body is fixedly connected into one piece by upper and lower parts. This facilitates manufacturing and installation.
[0021] 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
[0022] Figure 1 This is a schematic front view of the structure of this utility model.
[0023] Figure 2 for Figure 1 A magnified view of a portion of the image.
[0024] Figure 3 This is a top view illustrating the structure of this utility model.
[0025] Figure 4 for Figure 1 AA sectional view.
[0026] Figure 5 This is a schematic diagram of the gas pipe structure of this utility model.
[0027] In the diagram: 1. Flange; 2. Ascend pipe body; 3. Gas pipe; 4. Insulation layer; 5. Gas inlet valve; 6. Gas inlet branch pipe; 7. Gas inlet main pipe; 8. Gas purging pipe; 9. Purge pipe valve; 10. Semi-ring pipe; 11. Half pipe; 12. Gas outlet valve; 13. Gas outlet branch pipe; 14. Gas outlet main pipe. Detailed Implementation
[0028] 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.
[0029] 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.
[0030] 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.
[0031] Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0032] 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.
[0033] 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.
[0034] 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.
[0035] like Figure 1-5 As shown, a device for heating gas using waste heat from a riser pipe includes a flange 1, a riser pipe body 2, a gas pipe 3, an insulation layer 4, a gas inlet valve 5, a gas inlet branch pipe 6, a gas inlet main pipe 7, a gas purging pipe 8, a purging pipe valve 9, a semi-ring pipe 10, a semi-pipe 11, a gas outlet valve 12, a gas outlet branch pipe 13, and a gas outlet main pipe 14.
[0036] The riser body 2 is a vertical cylindrical body with a vertical axis. The lower part is the raw coal gas inlet and the upper part is the raw coal gas outlet. Two flanges 1 are fixed to the upper end and the lower section of the cylindrical body, respectively.
[0037] Gas pipe 3 is a vertical pipe connected vertically by 180-degree bends, forming a cylindrical shape. The upper end is the gas inlet, and the lower end is the gas outlet.
[0038] The riser pipe body 2 is divided into upper and lower parts, which are welded to the upper and lower vertical pipes and the outer side of the 180° elbow of the gas pipe 3, respectively. The upper and lower parts are welded together to form a cylindrical shape. The upper and lower ends of the riser pipe body 2 are welded to the flange 1. The riser pipe body 2 serves as both a sealing cylinder for raw gas and a heat exchanger with fins.
[0039] The interiors of flange 1, riser pipe body 2, and gas pipe 3 are ground smooth after welding to ensure a smooth surface and reduce scaling. Flange 1, riser pipe body 2, and gas pipe 3 are in direct contact with raw coal gas and are made of heat-resistant metal materials.
[0040] The upper and lower parts of the riser pipe body 2 are respectively opened between the vertical pipes of the gas pipe 3, and a semi-circular pipe 10 is welded to the outside to connect the gas purging pipe 8, forming a gas cavity. A semi-circular pipe 11 is welded inside the opening of the riser pipe body 2 to ensure that the gas in the gas cavity is blown up and down along the semi-circular pipe 11 through the opening to purge the internal scale.
[0041] The main gas inlet pipe 7 is located at the top of the unit and is connected to the upper end of the gas pipe 3 via a branch gas inlet pipe 6. A gas inlet valve 5 is installed on the branch gas inlet pipe 6.
[0042] The main gas outlet pipe 14 is located at the bottom of the unit and is connected to the lower end of the gas pipe 3 via a branch gas outlet pipe 13. A gas outlet valve 12 is installed on the branch gas outlet pipe 13.
[0043] There are two gas purging pipes. One end of the gas purging pipe is connected to the gas inlet branch pipe 6, and the connection point is located to the right of the gas inlet valve 5. The other end is connected to the riser pipe body 2.
[0044] Another gas purging pipe is connected at one end to the gas outlet branch pipe 13, and the connection point is located to the right of the gas outlet valve 12. The other end is connected to the riser pipe body 2.
[0045] After the above components are welded, a pressure test is conducted. Once the pressure test is passed, an insulation layer 4 is laid on the outside of the riser pipe body 2. This reduces heat loss from the riser pipe body and achieves energy-saving effects.
[0046] The working principle and process of this utility model specifically include:
[0047] 1) The raw coal gas inside the device flows from the bottom to the top. Nitrogen is first used to replace the gas pipe 3. After the nitrogen replacement, the gas inlet valve 5, the gas outlet valve 12, and the purge pipe valve 9 are closed.
[0048] 2) After gas is introduced into the gas inlet main pipe 7, the gas inlet valve 5 and the gas outlet valve 12 are opened. The gas enters the gas pipe 3 and exchanges heat with the raw gas. After being heated, the gas enters the gas outlet main pipe 14 for coke oven heating.
[0049] 3) When the equipment is running, open the purge pipe valve 9 periodically. The gas enters the gas cavity along the gas purge pipe 8 and then blows the internal scale up and down along the half pipe 11 through the opening to ensure the heat exchange effect and stable operation of the equipment.
[0050] This invention utilizes the waste heat from the riser pipe to heat the gas, making full use of the waste heat. The gas pressure is low, the equipment wall thickness is small, and the cost is low.
[0051] This utility model is safe and reliable for heating coal gas.
[0052] This invention removes impurities such as graphite from the inside of the riser pipe body 2 through gas purging. It is simple, reliable, does not affect the operation of the coke oven, and ensures stable operation of the equipment.
[0053] This invention uses raw coal gas to heat coal gas, thereby increasing the coal gas temperature and reducing the amount of coal gas used for heating coke ovens.
[0054] In this utility model, the gas pipe 3 is embedded inside the riser pipe body 2, which consists of upper and lower parts fixedly connected as one unit. This facilitates manufacturing and installation.
[0055] The riser pipe body 2 of this invention has an insulation layer 4 on its outer side. This reduces heat loss from the riser pipe body 2, achieving energy saving.
[0056] 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 device for heating coal gas using waste heat from a riser pipe, characterized in that: It includes the riser pipe body, gas pipe, gas inlet branch pipe, gas inlet main pipe, gas outlet branch pipe and gas outlet main pipe; The riser pipe body is a vertical cylinder with a raw coal gas inlet at the bottom and a raw coal gas outlet at the top. The gas pipe is curved at the top and bottom and straight in the middle, forming a cylindrical shape. The gas pipe is fixed to the side wall of the riser body. The main gas inlet pipe is located at the top of the device and is connected to the upper end of the gas pipe through a gas inlet branch pipe. The main gas outlet pipe is located at the bottom of the device and is connected to the lower end of the gas pipe through a branch gas outlet pipe.
2. The device for heating coal gas using waste heat from a riser pipe according to claim 1, characterized in that: It also includes flanges, which are fixed to the upper and lower ends of the riser pipe body.
3. The device for heating coal gas using waste heat from a riser pipe according to claim 1, characterized in that: The gas pipe is a vertical pipe connected vertically by 180-degree bends, forming a cylindrical shape; the upper end is the gas inlet, and the lower end is the gas outlet.
4. The device for heating coal gas using waste heat from a riser pipe according to claim 1, characterized in that: The outside of the riser pipe body is provided with a heat insulation layer.
5. The device for heating coal gas using waste heat from a riser pipe according to claim 1, characterized in that: The gas pipe is embedded in the riser pipe body, which is composed of upper and lower parts fixedly connected as one unit.
6. The device for heating coal gas using waste heat from a riser pipe according to claim 1, characterized in that: The gas inlet branch pipe is equipped with a gas inlet valve; the gas outlet branch pipe is equipped with a gas outlet valve.
7. The device for heating coal gas using waste heat from a riser pipe according to claim 1, characterized in that: It also includes two gas purging pipes: one gas purging pipe is connected at one end to the gas inlet branch pipe and at the other end to the riser pipe body; the other gas purging pipe is connected at one end to the gas outlet branch pipe and at the other end to the riser pipe body.
8. The device for heating coal gas using waste heat from a riser pipe according to claim 7, characterized in that: The upper and lower parts of the riser pipe body are respectively opened between the gas pipes, and a semi-ring pipe is fixed to the outside to connect the gas purging pipe, forming a gas cavity. The opening is fixed to a half-pipe, and the gas in the gas cavity blows up and down along the half-pipe through the opening to sweep away the scale inside the riser body.
9. The device for heating coal gas using waste heat from a riser pipe according to claim 7, characterized in that: The gas purging pipe is equipped with a purging pipe valve.