Device for indirectly heating ammonium sulfate mother liquor by utilizing waste heat of ascension pipe of coke oven
By using heat transfer oil as the medium and spiral coiled heat exchange tubes, the problems of low utilization efficiency of waste heat from coke oven raw gas and equipment stability were solved, achieving efficient and safe heating of ammonium sulfate mother liquor, and improving the safety and environmental performance of coke oven production.
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
- 2025-04-18
- Publication Date
- 2026-05-12
AI Technical Summary
In existing technologies, the utilization efficiency of waste heat from coke oven raw gas is low, resulting in serious waste of sensible heat. Furthermore, traditional riser heat exchangers are prone to deformation and leakage, affecting the safety and stability of coke oven production. The heating of ammonium sulfate mother liquor is unstable, affecting the operation of the ammonium sulfate section.
采用导热油作为换热介质，通过螺旋盘绕的换热管与焦炉上升管荒煤气换热，结合振动除垢技术，实现闭路系统加热硫铵母液，确保温度稳定和设备安全。
It improves the efficiency of sensible heat utilization of raw coal gas, avoids heat exchanger leakage and tar blockage, ensures the safety and stability of coke oven production and the temperature stability of ammonium sulfate mother liquor heating, and enhances the safety and reliability of the equipment.
Smart Images
Figure CN224230738U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of coking heat exchange equipment, and in particular to a device for indirectly heating ammonium sulfate mother liquor using waste heat from the coke oven riser pipe. Background Technology
[0002] The heat loss in the coking process mainly consists of four parts: sensible heat from the red-hot 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. The traditional method for treating raw coal gas in the coking industry is to spray a certain amount of circulating ammonia water at 70-75℃ onto it. As the circulating ammonia water absorbs heat and evaporates, the temperature of the raw coal gas decreases, making it possible for it to be recovered and processed by the chemical production section.
[0003] Traditional methods of cooling raw coal gas result in significant waste of its sensible heat. Coke oven raw coal gas waste heat utilization technology is an environmentally friendly new technology that recovers the sensible heat of raw coal gas, achieving energy conservation, emission reduction, and economic benefits. However, in the application of coke oven riser pipe waste heat utilization technology, the riser pipe heat exchanger often suffers from deformation and leakage due to unreasonable structure, inevitably leading to the entry of the heat exchange medium into the coke oven carbonization chamber, which endangers the safety and stability of coke oven production.
[0004] Meanwhile, traditional riser waste heat utilization technology cannot guarantee that the inner wall temperature of the riser evaporator must be ≥450℃, and cannot effectively avoid the temperature zone where a large amount of tar condenses, resulting in tar buildup and graphitization clogging the riser, thus bringing huge environmental hazards.
[0005] Conventional designs use steam heating for ammonium sulfate mother liquor heating. However, due to the instability of steam, especially in winter, the heating temperature of the ammonium sulfate mother liquor is unstable, affecting the operation of the ammonium sulfate section and causing instability in the deammonium gas degassing process. Utility Model Content
[0006] To overcome the shortcomings of existing technologies, this utility model provides a device for indirectly heating ammonium sulfate mother liquor using waste heat from coke oven riser pipes. This device uses heat transfer oil as both the heat exchange medium and the heating medium. The heat transfer oil exchanges heat with the raw coal gas inside the cylinder through heat exchange tubes. The heat exchange tubes are spirally coiled on the outside of the cylinder, resulting in high heat exchange efficiency. Simultaneously, the heat transfer oil vibrates as it passes through the heat exchange tubes, causing impurities on the inner wall of the cylinder to fall off with the vibration, ensuring stable operation of the equipment. The ammonium sulfate mother liquor is then heated by the mother liquor heater. This heat transfer oil heating system is a closed-loop system with high thermal efficiency. The heat transfer oil system achieves a high temperature for heating the ammonium sulfate mother liquor under relatively low operating pressure, and the working environment is safe and reliable.
[0007] To achieve the above objectives, the present invention adopts the following technical solution:
[0008] A device for indirectly heating ammonium sulfate mother liquor using waste heat from a coke oven riser includes a cylinder, heat exchange tubes, an inlet valve, a heat transfer oil inlet manifold, a heat transfer oil inlet pipe, a heat transfer oil pump, a heat transfer oil tank, a heat transfer oil pipe, a mother liquor heater, a heat transfer oil outlet pipe, a heat transfer oil outlet manifold, an outlet valve, a fixing component, and heat-conducting cement. The heat exchange tubes are spirally coiled around the outside of the cylinder and connected by the fixing component, with a gap between the heat exchange tubes and the fixing component. The outside of the heat exchange tubes is wrapped with heat-conducting cement. The outlet side of the heat exchange tubes is connected to the heat transfer oil outlet manifold and the mother liquor heater in sequence via the heat transfer oil outlet pipe, and an outlet valve is installed at the outlet of the heat exchange tubes. The inlet side of the heat exchange tubes is connected to the heat transfer oil inlet manifold, the heat transfer oil pump, and the heat transfer oil tank in sequence via the heat transfer oil inlet pipe, and an inlet valve is installed at the inlet of the heat exchange tubes. The mother liquor heater is connected to the heat transfer oil tank via the heat transfer oil pipe.
[0009] Furthermore, the device for indirectly heating ammonium sulfate mother liquor using waste heat from the coke oven riser pipe also includes a flange and external insulation. The flange is located at the bottom of the cylinder, and the external insulation is located on the outside of the cylinder.
[0010] Furthermore, the heat transfer oil tank includes a head, a tank body, a replenishing heat transfer oil inlet, a circulating heat transfer oil inlet, a heat transfer oil vent, and a circulating heat transfer oil outlet. The circulating heat transfer oil inlet is connected to a heat transfer oil pipe, and the circulating heat transfer oil outlet is connected to a heat transfer oil inlet pipe.
[0011] Furthermore, the mother liquor heater includes a mother liquor inlet, a lower tube box, a heat transfer oil outlet, a tube bundle, an upper tube box, a mother liquor outlet, and a heat transfer oil inlet. The mother liquor inlet and the mother liquor outlet are located at the upper and lower ends of the mother liquor heater. The mother liquor inlet is connected to the lower tube box, and the mother liquor outlet is connected to the upper tube box. A tube bundle is installed between the upper and lower tube boxes. The heat transfer oil inlet is connected to the heat transfer oil outlet pipe, and the heat transfer oil outlet is connected to the heat transfer oil pipe.
[0012] Furthermore, in the mother liquor heater, the flow direction of the ammonium sulfate mother liquor is opposite to the flow direction of the heat transfer oil.
[0013] Compared with the prior art, the beneficial effects of this utility model are:
[0014] 1) The heat exchange tubes are located on the outside of the cylinder, and the heat exchange tubes do not come into contact with the raw coal gas inside the cylinder. If there is a leak in the heat exchange tubes, it will not leak into the inside of the cylinder, thus preventing the heat exchange medium from entering the coke oven carbonization chamber, which will not harm the coke oven production and improve the safety and stability of the coke oven.
[0015] 2) The heat exchange tube is spirally coiled on the outside of the heat exchange tube, which increases the heat exchange distance of the heat transfer oil, prolongs the heat exchange time, and increases the heat exchange capacity. The heat transfer tube is filled with heat-conducting cement to increase the heat exchange surface, improve the heat exchange efficiency, and increase the heat exchange capacity. The heat transfer oil has a good heat exchange effect and the raw coal gas has a good cooling effect.
[0016] 3) The ammonium sulfate mother liquor is heated by heat transfer oil, which ensures stable heating temperature. The entire device is a closed-loop system during the heating process, resulting in high thermal efficiency. The device achieves a high heating temperature of the ammonium sulfate mother liquor under relatively low operating pressure, ensuring a safe and reliable working environment and guaranteeing production safety.
[0017] 4) Use heat exchange tube vibration descaling to remove graphite scale from the inner wall of the equipment, ensuring a smooth inner wall of the cylinder, improving the heat exchange efficiency between the raw coal gas and the heat transfer oil, ensuring stable operation of the unit, preventing tar buildup and graphitization from clogging the riser pipe, and eliminating environmental hazards. Attached Figure Description
[0018] Figure 1 This is a system diagram of a device for indirectly heating ammonium sulfate mother liquor using waste heat from the coke oven riser pipe, as described in this utility model.
[0019] Figure 2 This is a partial enlarged view (I) of the cylinder, heat exchange tube, fixing component and thermally conductive cement described in this utility model.
[0020] In the diagram: 1. Flange; 2. Shell; 3. Heat exchange tube; 4. Mother liquor heater; 5. Thermal oil tank; 6. Thermal oil inlet manifold; 7. Thermal oil inlet pipe; 8. Thermal oil pump; 9. Inlet valve; 10. Thermal oil pipe; 11. Outlet valve; 12. Thermal oil outlet pipe; 13. Thermal oil outlet manifold; 14. External insulation; 15. Fastener; 16. Thermally conductive cement; 41. Mother liquor inlet; 42. Lower tube box; 43. Thermal oil outlet; 44. Tube bundle; 45. Upper tube box; 46. Mother liquor outlet; 47. Thermal oil inlet; 51. End cap; 52. Tank; 53. Supplementary thermal oil inlet; 54. Circulating thermal oil inlet; 55. Thermal oil vent; 56. Circulating thermal oil outlet. Detailed Implementation
[0021] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings:
[0022] The working principle of a device that uses the waste heat of the coke oven riser pipe to indirectly heat ammonium sulfate mother liquor is as follows: the heat exchange medium is heat transfer oil, the heat transfer oil is indirectly heated by the raw coal gas, and then the ammonium sulfate mother liquor is indirectly heated by the heat transfer oil. The raw coal gas is effectively cooled, the heat in the raw coal gas is effectively utilized, and the indirect heating by the heat transfer oil ensures that the temperature of the ammonium sulfate mother liquor is stable.
[0023] like Figures 1-2As shown, a device for indirectly heating ammonium sulfate mother liquor using waste heat from a coke oven riser includes a cylinder 2, heat exchange tubes 3, an inlet valve 9, a heat transfer oil inlet manifold 6, a heat transfer oil inlet pipe 7, a heat transfer oil pump 8, a heat transfer oil tank 5, a heat transfer oil pipe 10, a mother liquor heater 4, a heat transfer oil outlet pipe 12, a heat transfer oil outlet manifold 13, an outlet valve 11, a fixing component 15, and heat-conducting cement 16. The heat exchange tubes 3 are spirally coiled around the outside of the cylinder 2. The spiral coiling increases the contact distance between the heat exchange tubes 3 and the cylinder 2, extending the heat exchange time. They are connected by the fixing component 15, with a gap between the heat exchange tubes 3 and the fixing component 15. During operation, changes in heat transfer oil pressure cause the heat exchange tubes 3 to vibrate, causing impurities on the smooth inner wall of the cylinder 2 to fall off with the vibration, ensuring stable operation of the equipment. The heat exchange tubes 3 are wrapped with heat-conducting cement 16, which connects the cylinder 2 and the heat exchange tubes 3, forming a whole. The heat exchange unit changes the traditional heat exchange method where the heat exchange tube 3 and the cylinder 2 are only connected by a line, increasing the heat exchange area and improving the heat exchange efficiency. The outlet side of the heat exchange tube 3 is connected to the heat transfer oil outlet manifold 13 and the mother liquor heater 4 in sequence through the heat transfer oil outlet pipe 12, and an outlet valve 11 is set at the outlet of the heat exchange tube 3. The inlet side of the heat exchange tube 3 is connected to the heat transfer oil inlet manifold 6, the heat transfer oil pump 8 and the heat transfer oil tank 5 in sequence through the heat transfer oil inlet pipe 7, and an inlet valve 9 is set at the inlet of the heat exchange tube 3. Several riser pipes are evenly distributed on the top of the coke oven, and each riser pipe can be equipped with a heat transfer oil heat exchange tube 3. The heat transfer oil outlet manifold 13 and the heat transfer oil inlet manifold 6 are then connected to the heat transfer oil tank 5 and the mother liquor heater 4 to heat the ammonium sulfate mother liquor. The inlet valve 9 and the outlet valve 11 distribute the pressure and flow rate of the heat transfer oil entering the heat exchange tube 3. The mother liquor heater 4 is connected to the heat transfer oil tank 5 through the heat transfer oil pipe 10.
[0024] Furthermore, the device for indirectly heating ammonium sulfate mother liquor using waste heat from the coke oven riser pipe also includes a flange 1 and an external insulation 14. The flange 1 is located at the bottom of the cylinder 2. The flange 1 and the inside of the cylinder 2 are ground smooth after welding to ensure a smooth interior and reduce scaling. The flange 1 and the cylinder 2 are in direct contact with the raw coal gas and are made of heat-resistant metal material. The external insulation 14 is located on the outside of the cylinder to reduce heat loss.
[0025] Furthermore, the heat transfer oil tank 5 includes a head 51, a tank body 52, a replenishing heat transfer oil inlet 53, a circulating heat transfer oil inlet 54, a heat transfer oil vent 55, and a circulating heat transfer oil outlet 56. The circulating heat transfer oil inlet 54 is connected to the heat transfer oil pipe 10, and the circulating heat transfer oil outlet 56 is connected to the heat transfer oil inlet pipe 7. The heat transfer oil after heating the ammonium sulfate mother liquor enters the heat transfer oil tank 5 through the heat transfer oil pipe 10 for circulating heat exchange. The replenishing heat transfer oil inlet 53 adds heat transfer oil periodically to compensate for the loss of heat transfer oil during heat exchange and heating. The heat transfer oil vent 55 is used to drain the heat transfer oil in the heat transfer oil tank 5 when the device needs to be regularly maintained and repaired.
[0026] Furthermore, the mother liquor heater 4 includes a mother liquor inlet 41, a lower tube box 42, a heat transfer oil outlet 43, a tube bundle 44, an upper tube box 45, a mother liquor outlet 46, and a heat transfer oil inlet 47. The mother liquor inlet 41 is located at the bottom of the mother liquor heater 4 and is connected to the lower tube box 42. The mother liquor outlet 46 is located at the top of the mother liquor heater 4 and is connected to the upper tube box 45. The tube bundle 44 is arranged between the upper tube box 42 and the lower tube box 45. The ammonium sulfate mother liquor flows through the mother liquor heater 4 from bottom to top. The heat transfer oil inlet 47 is located on the side of the mother liquor heater 4 at one end of the mother liquor outlet 46. The heat transfer oil outlet 43 is located on the side of the mother liquor heater 4 at one end of the mother liquor inlet 41. The heat transfer oil flows through the mother liquor heater 4 from top to bottom. The heat transfer oil inlet 47 is connected to the heat transfer oil outlet pipe 12, and the heat transfer oil outlet 43 is connected to the heat transfer oil pipe 10.
[0027] Furthermore, in the mother liquor heater 4, the flow direction of the ammonium sulfate mother liquor is opposite to that of the heat transfer oil, and the heat transfer oil and the ammonium sulfate mother liquor are indirectly heated in a countercurrent manner.
[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A device for indirectly heating ammonium sulfate mother liquor using waste heat from a coke oven riser, comprising a cylinder (2), heat exchange tubes (3), inlet valves (9), a heat transfer oil inlet manifold (6), a heat transfer oil inlet pipe (7), a heat transfer oil pump (8), a heat transfer oil tank (5), a heat transfer oil pipe (10), a mother liquor heater (4), a heat transfer oil outlet pipe (12), a heat transfer oil outlet manifold (13), an outlet valve (11), a fixing component (15), and heat-conducting cement (16), characterized in that, The heat exchange tube (3) is spirally coiled on the outside of the cylinder (2) and connected by a fixing member (15). There is a gap between the heat exchange tube (3) and the fixing member (15). The heat exchange tube (3) is wrapped with thermally conductive cement (16). The outlet side of the heat exchange tube (3) is connected to the thermally conductive oil outlet manifold (13) and the mother liquor heater (4) in sequence through the thermally conductive oil outlet pipe (12). An outlet valve (11) is set at the outlet of the heat exchange tube (3). The inlet side of the heat exchange tube (3) is connected to the thermally conductive oil inlet manifold (6), the thermally conductive oil pump (8) and the thermally conductive oil tank (5) in sequence through the thermally conductive oil inlet pipe (7). An inlet valve (9) is set at the inlet of the heat exchange tube (3). The mother liquor heater (4) is connected to the thermally conductive oil tank (5) through the thermally conductive oil pipe (10).
2. The apparatus for indirectly heating ammonium sulfate mother liquor using waste heat from coke oven riser pipes according to claim 1, characterized in that, The device for indirectly heating ammonium sulfate mother liquor using waste heat from the coke oven riser pipe further includes a flange (1) and an external insulation (14). The flange (1) is located at the bottom of the cylinder (2), and the external insulation (14) is located on the outside of the cylinder (2).
3. The apparatus for indirectly heating ammonium sulfate mother liquor using waste heat from coke oven riser pipes according to claim 1, characterized in that, The heat transfer oil tank (5) includes a head (51), a tank body (52), a supplementary heat transfer oil inlet (53), a circulating heat transfer oil inlet (54), a heat transfer oil vent (55), and a circulating heat transfer oil outlet (56). The circulating heat transfer oil inlet (54) is connected to the heat transfer oil pipe (10), and the circulating heat transfer oil outlet (56) is connected to the heat transfer oil inlet pipe (7).
4. The apparatus for indirectly heating ammonium sulfate mother liquor using waste heat from coke oven riser pipes according to claim 1, characterized in that, The mother liquor heater (4) includes a mother liquor inlet (41), a lower tube box (42), a heat transfer oil outlet (43), a tube bundle (44), an upper tube box (45), a mother liquor outlet (46), and a heat transfer oil inlet (47). The mother liquor inlet (41) and the mother liquor outlet (46) are located at the upper and lower ends of the mother liquor heater (4). The mother liquor inlet (41) is connected to the lower tube box (42), and the mother liquor outlet (46) is connected to the upper tube box (45). A tube bundle (44) is provided between the upper tube box (45) and the lower tube box (42). The heat transfer oil inlet (47) is connected to the heat transfer oil outlet pipe (12), and the heat transfer oil outlet (43) is connected to the heat transfer oil pipe (10).
5. The apparatus for indirectly heating ammonium sulfate mother liquor using waste heat from coke oven riser pipes according to claim 1, characterized in that, In the mother liquor heater (4), the flow direction of ammonium sulfate mother liquor is opposite to that of heat transfer oil.