Device and method for heating coal gas through waste heat of ascending pipe
By using the riser pipe waste heat heating gas device in the coke oven riser pipe and using coal gas as the heat exchange medium, the countercurrent heat exchange between waste gas and gas is achieved, which solves the problems of deformation, leakage and tar condensation in the waste heat utilization technology of the riser pipe, and improves the safety and stability of coke oven production and energy utilization efficiency.
Patent Information
- Application Number
- CN202510330761.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-20
- Publication Date
- 2025-06-20
AI Technical Summary
The waste heat utilization technology of coke oven riser is prone to deformation and leakage, and the temperature of the inner wall of the riser evaporator cannot be effectively controlled, resulting in tar condensation and graphitization blockage, affecting the safety and stability of coke oven production.
The gas device is heated by a gas outlet pipe, which heats the gas through waste gas, increases the gas temperature and reduces the amount of gas heated by coke ovens. The device includes a vertical structure rising pipe body, gas inlet and outlet pipe, fins and ultrasonic descaling device, which uses gas as a heat exchange medium to realize countercurrent heat exchange between waste gas and gas.
Effectively utilize the waste heat of the riser pipe, increase the gas temperature, reduce the amount of heated gas used in the coke oven, ensure the safety and stability of coke oven production, and prevent impurities from being scaled by ultrasonic descaling devices, and ensure the stable operation of the equipment.
Smart Images
Figure CN120173630A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of coking equipment, and particularly to a riser waste heat heating gas device and method. Background Art
[0002] The heat losses in the coking process mainly include four parts: sensible heat of the discharged red coke, sensible heat of the raw gas, sensible heat of the flue gas in the coke oven flue, and heat dissipation from the furnace body surface. The temperature of the raw gas in the coke oven is about 650 - 750 °C, and its sensible heat accounts for about 36% of the heat distribution in the coke oven.
[0003] At the present stage, the method for treating the raw gas in the coking industry is to spray a certain amount of circulating ammonia water at 70 - 75 °C. As the circulating ammonia water absorbs heat and evaporates, the temperature of the raw gas decreases, and then it can be recycled and processed by the chemical production section. Such a process treatment results in serious waste of the sensible heat of the raw gas.
[0004] The waste heat utilization technology of the raw gas in the coke oven is an environmental protection new technology that recovers the sensible heat of the raw gas to achieve energy conservation, emission reduction, and create economic benefits. However, during the application of the waste heat utilization technology of the coke oven riser, deformation and leakage are likely to occur. Moreover, when the above problems occur, it is impossible to avoid the working medium from entering the coke oven carbonization chamber, and it is impossible to ensure the safety and stability of the coke oven production. At the same time, it is impossible to effectively control the inner wall temperature of the riser evaporator (≥450 °C), and it is impossible to avoid the large tar condensation temperature zone, which is likely to cause tar and graphite deposition in the riser, block the riser, and cause environmental problems (smoking). Summary of the Invention
[0005] To overcome the deficiencies of the above-mentioned prior art, the present invention provides a riser waste heat heating gas device and method. The heat exchange medium is gas, and the raw gas is used to heat the gas to increase the gas temperature and reduce the consumption of the heating gas in the coke oven.
[0006] To achieve the above object, the present invention adopts the following technical solutions:
[0007] A riser waste heat heating gas device includes a riser body, a gas inlet branch pipe, a gas inlet main pipe, a gas outlet branch pipe, and a gas outlet main pipe; the riser body is of a vertical structure, including an inner cylinder, an outer cylinder, and fins. The inner cylinder is arranged inside the outer cylinder, and a cavity is formed between the inner cylinder and the outer cylinder to form a jacket. The fins are fixedly connected to the outer wall of the inner cylinder and are located in the jacket. The lower part of the riser body is the raw gas inlet, and the upper part is the raw gas outlet; one end of the gas inlet branch pipe is fixedly connected to the outer cylinder and is communicated with the jacket, and the other end is connected to the gas inlet main pipe; one end of the gas outlet branch pipe is fixedly connected to the outer cylinder and is communicated with the jacket, and the other end is connected to the gas outlet main pipe.
[0008] Furthermore, it further includes flanges, and the flanges are jacket flanges, which are fixedly connected to the upper and lower ends of the riser body.
[0009] Further, it also includes an ultrasonic descaling device, which includes a main unit, a cable, a transducer and a waveguide. The waveguide is fixedly connected to the flange, and the ultrasonic descaling device is used to remove impurities on the inner cylinder and the inner wall of the flange.
[0010] Further, it also includes a thermal insulation layer, which is arranged outside the outer cylinder.
[0011] Further, an expansion joint is provided in the middle of the outer cylinder.
[0012] Further, the fins are spiral fins.
[0013] Further, a gas inlet valve is provided on the gas inlet branch pipe.
[0014] Further, a gas outlet valve is provided on the gas outlet branch pipe.
[0015] A method for heating gas with the waste heat of the riser pipe is realized based on the above-mentioned device for heating gas with the waste heat of the riser pipe, and specifically includes the following steps:
[0016] 1) The raw gas enters the riser pipe body from the raw gas inlet and flows upward. First, the gas pipeline side is purged with nitrogen. After the nitrogen purging, the gas inlet valve and the gas outlet valve are closed.
[0017] 2) When gas is introduced into the main gas inlet pipe, the gas inlet valve and the gas outlet valve are opened. The gas enters the equipment jacket and flows downward along the fins in the jacket, counter-currently exchanging heat with the raw gas.
[0018] 3) The fins play a guiding role on the one hand, strengthening heat exchange, and on the other hand, increasing the heat exchange area and playing a role in heat exchange.
[0019] 4) The ultrasonic descaling device is enabled to remove impurity scaling during operation.
[0020] 5) The heated gas enters the main gas outlet pipe and is used for coke oven heating.
[0021] Compared with the prior art, the beneficial effects of the present invention are:
[0022] 1) The riser pipe body of the present invention is of a vertical structure, including an outer cylinder, an inner cylinder and fins fixedly connected to the inner cylinder. The cavity between the outer cylinder and the inner cylinder is a jacket. The lower part of the riser pipe body is the raw gas inlet, and the upper part is the raw gas outlet. The gas pipeline is communicated with the jacket. The heat exchange medium of the present invention is gas. Through the above structure, the raw gas is used to heat the gas, increasing the gas temperature and reducing the gas consumption for coke oven heating. The waste heat of the riser pipe is fully utilized to heat the gas. The gas pressure is low, the wall thickness of the equipment is small, and the cost is low.
[0023] 2) In the prior art, the gas preheater usually uses steam to heat the furnace return gas. The steam is unstable. Especially in winter, the heating effect cannot be achieved, and the steam consumption is increased. The present invention uses the waste heat of the riser pipe to heat the gas. Even if there is a leak, it will leak into the gas and will not explode. The present invention heats the gas, which is safe and reliable.
[0024] 3) The present invention is provided with an ultrasonic descaling device, which removes the impurities and scale on the inner wall during operation to ensure the stable operation of the equipment.
[0025] 4) The fins of the present invention are spiral fins. On the one hand, it increases the flow guiding effect and further strengthens the heat transfer. On the other hand, it greatly increases the heat transfer area and improves the heat transfer effect.
[0026] 5) A heat insulation layer is provided on the outer side of the riser pipe body of the present invention. It reduces the heat loss in the riser pipe body and achieves the effect of energy saving. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is the main view of the structural schematic diagram of the present invention.
[0028] In the figure: 1, flange; 2, inner cylinder; 3, outer cylinder; 4, fin; 5, heat 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 machine; 102, cable; 103, transducer; 104, waveguide. DETAILED DESCRIPTION OF THE INVENTION
[0029] The embodiments of the present invention will be described in detail below. To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present invention.
[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, 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 thus should not be construed as a limitation to the present invention.
[0031] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0032] In the description of the present invention, it should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components and / or their combinations.
[0033] Unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.
[0034] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without further statement, the above terms have no special meaning and thus should not be construed as a limitation to the protection scope of the present invention.
[0035] As shown Figure 1 in the figure, a waste heat heating gas device for a riser tube includes a flange 1, a riser tube 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.
[0036] The riser tube body is of a vertical structure and includes an inner cylinder 2, an outer cylinder 3, fins 4, and a heat insulation layer 5. Both the inner cylinder 2 and the outer cylinder 3 are cylindrical bodies 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 there is a gap between the inner cylinder 2 and the outer cylinder 3, which forms a cavity and a jacketed structure. The flange 1 is a jacket flange, and the two flanges 1 are respectively fixedly connected to the upper and lower end faces of the inner cylinder 2 and the outer cylinder 3.
[0037] The inner cylinder 2 is made of seamless steel pipe with a smooth inner wall. The flange 1 and the inner cylinder 2 are welded by butt welds, welded from the inside of the cylinder and ground flat after welding to ensure that the inside of the inner cylinder 2 is smooth after welding with the flange 1 and reduce fouling. The flange 1 and the outer cylinder 3 are welded by butt welds, welded from the outside. The flange 1, the inner cylinder 2, and the raw gas are in direct contact and are made of heat-resistant metal materials.
[0038] The fins 4 are spiral fins, welded to the outer wall of the inner cylinder 3, and are evenly distributed on the outer wall of the inner cylinder 3 with the axis of the inner cylinder 3 as the axis. On the one hand, the fins 4 play a role in guiding the flow and strengthening heat transfer. On the other hand, after being welded to the inner cylinder 3, they are located in the jacket, increasing the heat transfer area and playing a role in heat transfer.
[0039] 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 the deformation and leakage problems at the joints caused by thermal expansion and contraction, thereby extending the service life, and at the same time play a sealing role. The heat insulation layer 5 is arranged outside the outer cylinder 3 to reduce the heat loss in the riser tube body and achieve the effect of energy saving.
[0040] The ultrasonic descaling device 7 includes a main machine 101, a high-frequency cable 102, a transducer 103, and a waveguide 104. The waveguide 104 is welded to the flange 1 and is respectively installed on the upper and lower flanges 1 to remove impurities on the inner walls of the inner cylinder 2 and the flange 1.
[0041] The gas inlet pipe 11 is horizontally fixedly connected to the side wall of the outer cylinder 3, communicates with the jacket, and is located above the high point of the fins 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.
[0042] The gas outlet pipe 12 is horizontally and fixedly connected to the side wall of the outer cylinder 3, communicates with the jacket, and is located below the low 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.
[0043] A method for heating gas with the waste heat of the riser pipe is realized based on the above-mentioned device for heating gas with the waste heat of the riser pipe, and specifically includes the following steps:
[0044] 1) The raw gas enters the inside of the riser pipe from the raw gas inlet and flows upward. First, nitrogen replacement is carried out on the side of the gas pipeline. After nitrogen replacement, the gas inlet valve 8 and the gas outlet valve 13 are closed.
[0045] 2) When 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 downward along the fin 4 in the jacket, and exchanges heat with the raw gas in a countercurrent manner.
[0046] 3) The fin 4 plays a guiding role on the one hand to strengthen heat transfer, and on the other hand increases the heat transfer area to play a heat transfer role.
[0047] 4) The inner cylinder 2 and the inner wall of the flange 1 are smooth to reduce the scaling of impurities such as tar. At the same time, the ultrasonic descaling device 7 is enabled to remove the scaling of impurities such as tar during operation to ensure the stable operation of the equipment. The gas pressure is low, and there is no danger of internal leakage of the equipment, which does not affect the operation of the coke oven.
[0048] 5) The gas after heating enters the gas outlet main pipe 15 and is used for heating the coke oven.
[0049] In the present invention, the heat exchange medium is gas. The raw gas is heated by gas through the above structure, the gas temperature is increased, and the gas consumption for heating the coke oven is reduced. The waste heat of the riser pipe is fully utilized to heat the gas. The gas pressure is low, the wall thickness of the equipment is small, and the cost is low.
[0050] In the prior art, the gas preheater usually uses steam to heat the return gas. The steam is unstable, especially in winter, the heating effect cannot be achieved, and the steam consumption is also increased; in the present invention, the waste heat of the riser pipe is used to heat the gas. Even if there is a leak, it will leak into the gas and will not explode. The present invention heats the gas, which is safe and reliable.
[0051] The above is only a part of the specific implementation manners of the present invention. The protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.
Claims
1. A rising pipe waste heat heating gas device, characterized in that: It includes a riser main body, a gas inlet branch pipe, a gas inlet main pipe, a gas outlet branch pipe and a gas outlet main pipe; The riser body is a vertical structure, including an inner cylinder, an outer cylinder and fins. The inner cylinder is arranged inside the outer cylinder. 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 are located inside the jacket. The lower part of the riser body is a raw gas inlet, and the upper part is a raw gas outlet. One end of the gas inlet branch pipe is fixedly connected to the outer cylinder and communicates with the jacket, and the other end is connected to the gas inlet main pipe; One end of the gas outlet branch pipe is fixedly connected to the outer cylinder body and communicated with the jacket, and the other end is communicated with the gas outlet main pipe.
2. The device for heating gas by using waste heat from a rising pipe according to claim 1, characterized in that: It also includes a flange, which is a jacket flange and is fixedly connected to the upper end and the lower end of the riser body.
3. The device for heating gas by using waste heat from a rising pipe according to claim 1, characterized in that: It also includes an ultrasonic descaling device, which includes a host, a cable, a transducer and a 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.
4. The device for heating gas by using waste heat from a rising pipe according to claim 1, characterized in that: It also includes a heat-insulating layer, which is arranged outside the outer cylinder.
5. The device for heating gas by using waste heat from a rising pipe according to claim 1, characterized in that: An expansion joint is arranged in the middle of the outer cylinder.
6. The device for heating gas by using waste heat from a rising pipe according to claim 1, characterized in that: The fins are spiral fins.
7. The device for heating gas by using waste heat from a rising pipe according to claim 1, characterized in that: The gas inlet branch pipe is provided with a gas inlet valve.
8. The device for heating gas by using waste heat from a rising pipe according to claim 1, characterized in that: The gas outlet branch pipe is provided with a gas outlet valve.