Sulfur furnace waste heat recycling system

Abstract

The utility model discloses a sulfur furnace waste heat recycling system which comprises a heat exchange tower, a plurality of heat exchange modules are sequentially arranged on the heat exchange tower in the vertical direction, each heat exchange module comprises a heat exchange oil pipe, a valve and a temperature sensor, heat conduction oil can be introduced into the heat exchange oil pipe, and the heat exchange oil pipe is provided with an oil inlet and an oil outlet. The temperature sensor monitors whether the heat conduction oil in the heat exchange oil pipeline reaches the oil outlet temperature or not; the cooling module and the heat utilization unit are both provided with a structure capable of introducing heat conduction oil and a temperature sensor; an oil outlet of the heat exchange oil pipe is respectively communicated with oil inlets of the heat utilization unit and the cooling module; an oil inlet of the heat exchange oil pipe is respectively communicated with oil outlets of the heat utilization unit and the cooling module; valves are arranged on a pipeline for communicating an oil outlet of the heat exchange oil pipe to the heat utilization unit and a pipeline for communicating the oil outlet of the heat exchange oil pipe to the cooling module; a plurality of oil pumps for conveying heat conduction oil are arranged on the pipelines; and the inside of the heat exchange tower is respectively communicated with the sulfur furnace and the sulfur tail gas treatment equipment. The heat exchange tower can be matched with the slow heat utilization rhythm of the heat utilization unit without stopping the heat exchange tower.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste heat recovery and utilization, and particularly relates to a sulfur furnace waste heat recovery and utilization system. Background Art

[0002] There are generally multiple heat-consuming units on the sulfur process line, such as the sulfur purification unit and the sulfur recovery and treatment unit. At the same time, the flue gas outlet temperature of the sulfur furnace can reach 750°C. However, at present, the high temperature of most sulfur furnaces is not recycled and reused, but is wasted as waste heat. If the heat energy of the sulfur furnace can be recovered and reused in the heat-consuming units on the sulfur process line, the process line's dependence on traditional energy can be reduced.

[0003] In order to achieve the above-mentioned purpose, the patent document with application number CN200710139538.0 discloses a method for producing carbon disulfide by utilizing the waste heat of reaction. A waste heat collector is installed on the flue of the gasification reactor. A heating pipe is provided in the waste heat collector. The heating pipe is connected to the heating jacket of the sulfur melting pot, desulfurizer, conduit and sulfur steaming tower through an oil pipeline to form a closed loop, and the closed loop is filled with heat transfer oil. The waste heat collector collects the waste heat of the gasification reactor in the flue, heats the heat transfer oil, and circulates it automatically, heating the sulfur melting pot, desulfurizer, conduit and sulfur steaming tower in turn to complete the sulfur melting, heat preservation, desulfurization and sulfur steaming processes in the carbon disulfide production process.

[0004] The above-mentioned existing technology uses waste heat collectors to recover waste heat from reactions, replacing coal-fired boilers to provide heat for the heating process in the production process, which can save energy, reduce production costs, reduce air pollution, and improve environmental quality. However, the heating units on the sulfur process line all have a specifically designed temperature range, which is generally designed based on the characteristics of the processed materials and after weighing production efficiency and production costs. The highest and lowest temperatures in this temperature range generally do not exceed 30 degrees (for example, 180-200°C, 200-220°C, etc.), while the flue gas heat energy output by the sulfur furnace is as high as 750°C. Using the waste heat of the sulfur furnace to heat the heat transfer oil to increase the temperature by 20 to 30 degrees It is very fast. The production plan of the sulfur process line is sometimes high and sometimes low according to the actual order situation. When the production plan of the sulfur process line is low, the heat consumption is correspondingly low, or the sulfur process line only opens some heat-using units. At this time, the heat exchange rhythm and the heat-using rhythm will not match. It often happens that the previous batch of heat transfer oil has not reached the return oil temperature, that is, the heat transfer oil is still consuming heat in the heat unit, but the next batch of heat transfer oil has been heated to the target oil outlet temperature by the high-temperature waste heat of the sulfur furnace. Repeatedly opening and closing the waste heat collector to match the slower heat consumption rhythm is not conducive to the service life of the equipment, and is not in line with the actual process line design thinking for production.

[0005] In summary, based on the discovery of the above technical problems, the applicant believes that it is necessary to develop a sulfur furnace waste heat recovery and utilization system that can match the fast or slow heat usage rhythm of the sulfur process line without shutting down the heat exchange equipment. Summary of the Invention

[0006] In view of the problems in the related technology, the utility model proposes a sulfur furnace waste heat recovery and utilization system to overcome the above technical problems existing in the existing related technology.

[0007] The technical solution of the present utility model is achieved as follows:

[0008] A sulfur furnace waste heat recovery and utilization system includes a heat exchange tower, a cooling module, several heat use units and several pipelines;

[0009] The heat exchange tower is vertically arranged with a plurality of heat exchange modules, each of which comprises a heat exchange oil pipe for introducing heat transfer oil, a valve, and a first temperature sensor. The heat exchange oil pipe has an oil inlet and an oil outlet. The first temperature sensor monitors whether the heat transfer oil in the heat exchange oil pipe reaches the oil outlet temperature.

[0010] The cooling module includes a structure for allowing the flow of heat transfer oil, having an oil inlet and an oil outlet, and is provided with a second temperature sensor for monitoring the temperature of the heat transfer oil;

[0011] The heat-using unit includes a structure for allowing heat transfer oil to flow in, having an oil inlet and an oil outlet, and is provided with a third temperature sensor for monitoring the temperature of the heat transfer oil;

[0012] The second sensor and the third sensor monitor whether the heat transfer oil has cooled to the return oil temperature;

[0013] The oil outlet of the heat exchange oil pipe is directly or indirectly connected to the oil inlet of the heat unit and the oil inlet of the cooling module through pipelines;

[0014] The oil inlet of the heat exchange oil pipe is directly or indirectly connected to the oil outlet of the heat unit and the oil outlet of the cooling module through pipelines;

[0015] The oil outlet of the heat exchange oil pipe is connected to the pipeline of the heat unit and the pipeline connected to the cooling module, both of which are provided with valves, and the pipeline is provided with several oil pumps for conveying heat transfer oil;

[0016] The first temperature sensor monitors the heat transfer oil in the heat exchange oil pipeline to reach the oil outlet temperature, and transports the heat transfer oil heated to the oil outlet temperature outward. The heat transfer oil heated to the oil outlet temperature is transported to the heat use unit, the cooling module, or both through the pipeline. The second sensor and the third sensor monitor the heat transfer oil to cool to the return oil temperature. The heat transfer oil whose heat energy has been consumed is transported back to the oil inlet of the heat exchange oil pipeline through the pipeline.

[0017] The oil outlet temperature monitored by the first temperature sensor is higher than the oil return temperature monitored by the second temperature sensor and the third temperature sensor and the difference does not exceed 30°C;

[0018] The interior of the heat exchange tower is directly or indirectly connected to the sulfur furnace and the sulfur tail gas treatment equipment.

[0019] Compared with the prior art, the present invention can flexibly match various production plans of the sulfur process line through structural design, pipeline design and the addition of a cooling module. When the heat transfer oil heating speed of the heat exchange tower is faster than the heat consumption speed of the heat-using unit, the heated heat transfer oil can be transported to the cooling module for cooling. After the heat transfer oil is cooled to the return oil temperature in the cooling module, it is transported back to the heat exchange tower. That is, the present invention realizes matching the slower heat consumption rhythm of the heat-using unit without shutting down the heat exchange tower by designing an additional cooling branch that consumes the heat energy of the heat transfer oil. When the heat consumption speed of the heat-using unit is comparable to the heat transfer oil heating speed of the heat exchange tower, the pipeline leading to the cooling module is closed, so that the heated heat transfer oil flows exclusively to the heat-using unit.

[0020] In addition, the present invention designs several groups of heat exchange modules, and the staff can selectively open or close the target number of heat exchange modules according to the actual production situation.

[0021] From the above, it can be seen that the heat exchange tower of the present invention is provided with multiple heat exchange modules, that is, the heat exchange tower has multiple oil outlets. If the oil is only collected through pipelines and then transported to the target location, it is not convenient to distribute the oil supply to each branch or readjust the flow rate. Therefore, the present invention designs a buffer oil collection tank to solve this problem.

[0022] Preferably, the oil outlet of the heat exchange oil pipe is directly or indirectly connected to a buffer oil collecting tank, and the buffer oil collecting tank transports the heat transfer oil heated to the oil outlet temperature to the oil inlet of the heat consuming unit, the oil inlet of the cooling module, or to the oil inlets of the heat consuming unit and the cooling module at the same time through a pipeline;

[0023] The oil outlet of the heat-using unit and the oil outlet of the cooling module are directly or indirectly connected to the oil inlet of the heat exchange oil pipe.

[0024] The utility model also discloses another buffer oil collecting tank connection method, that is, the oil outlet of the heat exchange oil pipe is connected to a buffer oil collecting tank and the oil inlet of the cooling module respectively, and the buffer oil collecting tank transports the heat transfer oil heated to the oil outlet temperature to the oil inlet of the heat using unit through the pipeline;

[0025] The oil outlet of the heat-using unit and the oil outlet of the cooling module are directly or indirectly connected to the oil inlet of the heat exchange oil pipe.

[0026] Those skilled in the art can adaptably set an oil pump and a flow regulating valve for the communication pipeline between the buffer oil collecting tank and the target unit to achieve oil supply distribution or flow readjustment, which will not be elaborated here.

[0027] Preferably, a plurality of support structures are provided on the inner side wall of the heat exchange tower at positions corresponding to the plurality of heat exchange modules, and the support structures support the heat exchange modules so that they are suspended at a target height inside the heat exchange tower;

[0028] The support structure includes channel steel, a support plate and an insulation layer. The channel steel supports the support plate, and the insulation layer semi-surrounds or fully surrounds the channel steel to prevent the channel steel from being too directly exposed to high-temperature flue gas, thereby providing thermal insulation protection.

[0029] Specifically, the sulfur furnace is a large horizontal device that cannot be placed vertically. Moreover, the size of its smoke outlet is extremely large, making it inconvenient to design a curved pipe to connect it to the heat exchange tower. Therefore, the smoke inlet of the heat exchange tower of the present invention is arranged at the bottom of its side wall. The central axis of the smoke inlet of the heat exchange tower coincides with the central axis of the smoke outlet of the sulfur furnace. The smoke inlet of the heat exchange tower and the smoke outlet of the sulfur furnace are connected in a straight line.

[0030] A smoke outlet is provided at the top of the heat exchange tower. The smoke outlet is arranged above the heat exchange module at the highest position in the vertical direction. The smoke outlet is connected to the sulfur tail gas treatment device.

[0031] Based on the above-mentioned design of the position of the smoke inlet and smoke outlet of the heat exchange tower, the high-temperature smoke generated by the sulfur furnace gradually decreases as the height increases in the heat exchange tower, while the weight borne by the support structures of different heights increases as the height decreases. Therefore, the utility model designs two technical solutions for support structures of different heights:

[0032] The heat exchange tower is divided into an upper space and a lower space along the vertical direction, the support structure located in the upper space is set as an upper support structure, and the support structure located in the lower space is set as a lower support structure;

[0033] The thermal insulation layer of the upper support structure is designed to be a lighter thermal insulation cotton layer, which reduces the weight of the upper support structure and reduces the weight borne by the lower support structure. At the same time, since the temperature of the upper space is lower, the thermal insulation cotton layer only needs to wrap the outer side and bottom surface of the channel steel, and the top surface of the channel steel supports the support plate.

[0034] The insulation layer of the lower support structure located at the bottom is designed to include a first refractory mud layer and a second refractory mud layer. The second refractory mud layer wraps the outer side surface and bottom surface of the channel steel, and the top surface of the channel steel supports the support plate. The first refractory mud layer covers the top surface of the channel steel, and the support plate is clamped between the first refractory mud layer and the second refractory mud layer. The temperature of the lower space is higher and the weight borne by the lower support structure is larger, so the channel steel needs to be fully wrapped for thermal insulation protection. At the same time, refractory mud with better high temperature resistance and structural strength is used as the insulation layer of the lower support structure.

[0035] Preferably, the inner wall of the heat exchange tower is covered with an aluminum silicate insulation layer with excellent thermal insulation performance, which can effectively reduce the heat loss of the heat exchange tower and improve the operating efficiency of the heat exchange tower.

[0036] Since the high-temperature flue gas generated by the sulfur furnace is under positive pressure, the heat exchange module is preferably a serpentine tube heat exchanger with better pressure-bearing capacity, and the heat transfer oil is transported to the cooling module for the purpose of rapid cooling. Therefore, the cooling module is preferably a fin tube heat exchanger with better heat dissipation effect. Specifically, a number of upward-blowing fans are provided at the bottom of the fin tube heat exchanger.

[0037] Preferably, the heat exchange tower is provided with several soot blowing interfaces along the vertical direction. To ensure a better soot blowing effect, the number of the soot blowing interfaces corresponds to the number of the heat exchange modules. The soot blowing interfaces are connected to an external soot blower to perform soot blowing operations to avoid flue gas deposition and affect the heat exchange efficiency.

[0038] The outer side wall of the heat exchange tower is provided with lifting lugs for easy lifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the flow of heat transfer oil in Example 1 of the present utility model;

[0040] Figure 2 This is a schematic diagram of the flow of heat transfer oil in Example 2 of the present utility model;

[0041] Figure 3 This is a schematic diagram of the system structure of Example 1 of the utility model;

[0042] Figure 4 This is a schematic structural diagram of a heat exchange tower according to the present invention;

[0043] Figure 5 for Figure 4 A magnified view of point A;

[0044] Figure 6 for Figure 4 Enlarged view of point B;

[0045] Figure 7 It is a cross-sectional view of the heat exchange tower of the present invention in the horizontal direction;

[0046] Figure 8 This is a schematic diagram of the steel tank distribution of the heat exchange tower of the present utility model;

[0047] Figure 9 This is a schematic diagram of the serpentine tube array structure of the present utility model.

[0048] Marking Description:

[0049] E. Heat unit;

[0050] S, sulfur furnace;

[0051] H. heat exchange tower;

[0052] H1~H4, heat exchange module;

[0053] H5, soot blowing interface;

[0054] H6, lifting lug;

[0055] H7, aluminum silicate insulation layer;

[0056] H8, channel steel;

[0057] H9, support plate;

[0058] H10, thermal insulation cotton layer;

[0059] H11, first refractory mud layer;

[0060] H12, second refractory mud layer;

[0061] W, cooling module;

[0062] W1, fin tube heat exchanger;

[0063] W2, fan;

[0064] G. Buffer oil collecting tank;

[0065] t1, first temperature sensor;

[0066] t2, second temperature sensor;

[0067] t3, third temperature sensor;

[0068] z1, the first valve;

[0069] z2. The second valve. DETAILED DESCRIPTION

[0070] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0071] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0072] The following two embodiments are both technically described using an oil outlet temperature of 220°C and an oil return temperature of 200°C as an example.

[0073] Example 1

[0074] like Figure 1 、 Figures 3 to 9 As shown, a sulfur furnace waste heat recovery and utilization system includes a heat exchange tower H, a cooling module W, multiple heat use units E and several pipelines.

[0075] The heat exchange tower H is vertically arranged with several groups (four groups in the attached figure) of heat exchange modules H1 to H4. Each group of the heat exchange modules includes a heat exchange oil pipe for passing heat transfer oil, a valve and a first temperature sensor t1. The heat exchange oil pipe has an oil inlet and an oil outlet. The first temperature sensor t1 monitors whether the heat transfer oil in the heat exchange oil pipe reaches the oil outlet temperature of 220°C.

[0076] The cooling module W includes a structure through which heat transfer oil can flow, has an oil inlet and an oil outlet, and is provided with a second temperature sensor t2 for monitoring the temperature of the heat transfer oil.

[0077] The heat-using unit E includes a structure for allowing heat transfer oil to flow in, having an oil inlet and an oil outlet, and is provided with a third temperature sensor t3 for monitoring the temperature of the heat transfer oil.

[0078] The second sensor and the third sensor monitor whether the heat transfer oil is cooled to the return oil temperature of 200°C.

[0079] The oil outlet of the heat exchange oil pipe is directly or indirectly connected to the oil inlet of the heat unit E and the oil inlet of the cooling module W through pipelines.

[0080] The oil inlet of the heat exchange oil pipe is directly or indirectly connected to the oil outlet of the heat unit E and the oil outlet of the cooling module W through pipelines.

[0081] The oil outlet of the heat exchange oil pipe is connected to the pipeline of the heat-using unit E and is provided with a first valve z1, and the oil outlet of the heat exchange oil pipe is connected to the pipeline of the cooling module W and is provided with a second valve z2. The pipeline is provided with multiple oil pumps for conveying heat transfer oil (the position design of the valves and oil pumps is conventional technology, not shown in the drawings).

[0082] The first temperature sensor t1 monitors the heat transfer oil in the heat exchange oil pipeline and reaches the oil outlet temperature of 220°C, and transports the heat transfer oil heated to the oil outlet temperature of 220°C outward. The heat transfer oil heated to the oil outlet temperature is transported to the heat-using unit E, the cooling module W, or to the heat-using unit E and the cooling module W at the same time through the pipeline. The second sensor and the third sensor monitor the heat transfer oil cooling to the return oil temperature of 200°C, which does not meet the temperature requirement of the heat-using unit E. The heat transfer oil whose heat energy has been consumed is transported back to the oil inlet of the heat exchange oil pipe through the pipeline and reheated to 220°C.

[0083] The oil outlet temperature monitored by the first temperature sensor t1 is higher than the oil return temperature monitored by the second temperature sensor t2 and the third temperature sensor t3 and the difference is no more than 30°C. In this embodiment, the oil outlet temperature monitored by the first temperature sensor t1 is 220°C, and the oil return temperature monitored by the second temperature sensor t2 and the third temperature sensor t3 is 200°C, with a difference of 20°C.

[0084] The interior of the heat exchange tower H is directly or indirectly connected to the sulfur furnace S and the sulfur tail gas treatment equipment.

[0085] In order to clearly show the design of the thermal oil delivery pipeline, the pipeline for delivering 220°C thermal oil is shown as "solid line + arrow" in the attached figure, and the pipeline for delivering 200°C thermal oil is shown as "dotted line + arrow".

[0086] In this embodiment, the heat-using unit E may be a purification unit on a sulfur process line, a sulfur recovery unit using a low-temperature Scot process, or the like.

[0087] The oil outlet of the heat exchange oil pipe is connected to a buffer oil collecting tank G and the oil inlet of the cooling module W respectively. The buffer oil collecting tank G transports the heat transfer oil heated to the oil outlet temperature to the oil inlet of the heat consuming unit E through a pipeline;

[0088] The oil outlet of the heat-using unit E and the oil outlet of the cooling module W are directly or indirectly connected to the oil inlet of the heat exchange oil pipe.

[0089] The heat transfer oil to be transported to the heat-using unit E is first transported to the buffer oil collection tank G, and then the oil supply distribution and flow rate are readjusted according to the specific situation of the heat-using unit E. If the heat consumption speed of the heat-using unit E is too slow, the heat transfer oil that has been heated to the oil outlet temperature is selectively transported directly to the cooling module W.

[0090] Those skilled in the art can adaptably set an oil pump and a flow regulating valve for the communication pipeline between the buffer oil collecting tank G and the target unit to achieve oil supply distribution or flow readjustment, which will not be elaborated here.

[0091] In this embodiment, a plurality of (four) supporting structures are provided on the inner sidewall of the heat exchange tower H corresponding to the positions of the plurality of (four) groups of heat exchange modules. The supporting structures support the heat exchange modules so that they are suspended at a target height inside the heat exchange tower H.

[0092] The support structure includes a channel steel H8, a support plate H9 and an insulation layer. The channel steel H8 supports the support plate H9. The insulation layer semi-encloses or fully surrounds the channel steel H8 to prevent the channel steel H8 from being too directly exposed to high-temperature flue gas, thereby providing thermal insulation protection.

[0093] Specifically, refer to Figure 1 The sulfur furnace S is a large horizontal device. The smoke inlet of the heat exchange tower H is located at the bottom of its side wall. The central axis of the smoke inlet of the heat exchange tower H coincides with the central axis of the smoke outlet of the sulfur furnace S. The smoke inlet of the heat exchange tower H is connected to the smoke outlet of the sulfur furnace S in a straight line.

[0094] A smoke outlet is provided at the top of the heat exchange tower H. The smoke outlet is provided above the heat exchange module at the highest position in the vertical direction and is connected to a sulfur tail gas treatment device (such as an absorption tower, etc.).

[0095] In this embodiment, the heat exchange tower H is divided into an upper space and a lower space along the vertical direction. The support structure located in the upper space is set as an upper support structure, and the support structure located in the lower space is set as a lower support structure.

[0096] Reference Figure 4 and Figure 5 The two upper support structures' insulation layers are designed to be lighter insulation cotton layers H10. By reducing the weight of the upper support structure, the weight borne by the lower support structure is reduced. At the same time, since the temperature of the upper space is lower, the insulation cotton layer H10 only needs to wrap the outer side and bottom surface of the channel steel H8. The top surface of the channel steel H8 supports the support plate H9.

[0097] Reference Figure 4 and Figure 6The two lower support structures have a heat-insulating layer comprising a first refractory mud layer H11 and a second refractory mud layer H12. The second refractory mud layer H12 wraps the outer side and bottom surface of the channel steel H8. The top surface of the channel steel H8 supports the support plate H9. The first refractory mud layer H11 covers the top surface of the channel steel H8. The support plate H9 is clamped between the first refractory mud layer H11 and the second refractory mud layer H12. The temperature of the lower space is high and the weight borne by the lower support structure is large. Therefore, the channel steel H8 needs to be fully wrapped for heat-insulating protection. At the same time, refractory mud with better high-temperature resistance and structural strength is used as the heat-insulating layer of the lower support structure.

[0098] In this embodiment, the inner wall of the heat exchange tower H is covered with an aluminum silicate insulation layer H7 with excellent thermal insulation performance, which can effectively reduce the heat loss of the heat exchange tower H and improve the operating efficiency of the heat exchange tower H.

[0099] Since the 750℃ high temperature flue gas generated by the sulfur furnace S is under positive pressure, the heat exchange module of this embodiment uses a serpentine tube heat exchanger with better pressure bearing capacity. The array diagram of the serpentine tube is shown in FIG. Figure 9 The purpose of delivering the heat transfer oil to the cooling module W is to achieve a rapid cooling effect. Therefore, the cooling module W of this embodiment uses a fin-tube heat exchanger W1 with a better heat dissipation effect. Specifically, a plurality of upward-blowing fans W2 are provided at the bottom of the fin-tube heat exchanger W1 to rapidly cool the heat transfer oil.

[0100] In this embodiment, the heat exchange tower H is provided with several (four) soot blowing interfaces H5 along the vertical direction. To ensure a better soot blowing effect, the number of the soot blowing interfaces H5 corresponds to the number of the heat exchange modules. The soot blowing interfaces H5 are externally connected to a soot blower to perform soot blowing operations (conventional technology, not shown in the drawings) to avoid flue gas deposition and affect the heat exchange efficiency.

[0101] The outer wall of the heat exchange tower H is provided with a lifting lug H6 for easy lifting.

[0102] Example 2

[0103] Reference Figure 2 、 Figures 4 to 9 The difference between this embodiment and embodiment 1 is that:

[0104] The oil outlet of the heat exchange oil pipe is directly or indirectly connected to a buffer oil collecting tank G, and the buffer oil collecting tank G transports the heat transfer oil heated to the oil outlet temperature to the oil inlet of the heat consuming unit E, the oil inlet of the cooling module W, or to the oil inlets of the heat consuming unit E and the cooling module W at the same time through a pipeline;

[0105] The oil outlet of the heat-using unit E and the oil outlet of the cooling module W are directly or indirectly connected to the oil inlet of the heat exchange oil pipe.

[0106] That is, in this embodiment, all the heat transfer oils that have been heated to the oil outlet temperature are collected in the buffer oil collection tank G, and then distributed to the subsequent branches and heat consumption units (such as the sulfur purification unit, the sulfur recovery unit, the cooling module W, etc.); the rest of the structure of this embodiment is the same as that of Example 1 and will not be repeated here.

[0107] Those skilled in the art can adaptively set an oil pump and a flow regulating valve for the communication pipeline between the buffer oil collecting tank G and the target heat consuming unit to achieve oil supply distribution or flow readjustment, which will not be elaborated here.

[0108] Based on the disclosure and teachings of the above specification, those skilled in the art may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

1. A sulfur furnace waste heat recovery system, characterized in that: It includes a heat exchange tower, a cooling module, several heat-using units and several pipelines; The heat exchange tower is vertically arranged with a plurality of heat exchange modules, each of which comprises a heat exchange oil pipe for introducing heat transfer oil, a valve, and a first temperature sensor. The heat exchange oil pipe has an oil inlet and an oil outlet. The first temperature sensor monitors whether the heat transfer oil in the heat exchange oil pipe reaches the oil outlet temperature. The cooling module includes a structure for allowing the flow of heat transfer oil, having an oil inlet and an oil outlet, and is provided with a second temperature sensor for monitoring the temperature of the heat transfer oil; The heat-using unit includes a structure for allowing heat transfer oil to flow in, having an oil inlet and an oil outlet, and is provided with a third temperature sensor for monitoring the temperature of the heat transfer oil; The second sensor and the third sensor monitor whether the heat transfer oil has cooled to the return oil temperature; The oil outlet of the heat exchange oil pipe is directly or indirectly connected to the oil inlet of the heat unit and the oil inlet of the cooling module through pipelines; The oil inlet of the heat exchange oil pipe is directly or indirectly connected to the oil outlet of the heat unit and the oil outlet of the cooling module through pipelines; The oil outlet of the heat exchange oil pipe is connected to the pipeline of the heat unit and the pipeline connected to the cooling module, both of which are provided with valves, and the pipeline is provided with several oil pumps for conveying heat transfer oil; The first temperature sensor monitors the heat transfer oil in the heat exchange oil pipeline to reach the oil outlet temperature, and transports the heat transfer oil heated to the oil outlet temperature outward. The heat transfer oil heated to the oil outlet temperature is transported to the heat use unit, the cooling module, or both through the pipeline. The second sensor and the third sensor monitor the heat transfer oil to cool to the return oil temperature. The heat transfer oil whose heat energy has been consumed is transported back to the oil inlet of the heat exchange oil pipeline through the pipeline. The oil outlet temperature monitored by the first temperature sensor is higher than the oil return temperature monitored by the second temperature sensor and the third temperature sensor and the difference does not exceed 30°C; The interior of the heat exchange tower is directly or indirectly connected to the sulfur furnace and the sulfur tail gas treatment equipment.

2. The sulfur furnace waste heat recovery system according to claim 1, characterized in that: The oil outlet of the heat exchange oil pipe is directly or indirectly connected to a buffer oil collecting tank, and the buffer oil collecting tank transports the heat transfer oil heated to the oil outlet temperature to the oil inlet of the heat consuming unit, the oil inlet of the cooling module, or to the oil inlets of the heat consuming unit and the cooling module at the same time through a pipeline; The oil outlet of the heat-using unit and the oil outlet of the cooling module are directly or indirectly connected to the oil inlet of the heat exchange oil pipe.

3. The sulfur furnace waste heat recovery system according to claim 1, characterized in that: The oil outlet of the heat exchange oil pipe is connected to a buffer oil collecting tank and the oil inlet of the cooling module respectively. The buffer oil collecting tank transports the heat transfer oil heated to the oil outlet temperature to the oil inlet of the heat unit through a pipeline; The oil outlet of the heat-using unit and the oil outlet of the cooling module are directly or indirectly connected to the oil inlet of the heat exchange oil pipe.

4. The sulfur furnace waste heat recovery system according to claim 1, characterized in that: A plurality of support structures are provided on the inner side wall of the heat exchange tower corresponding to the positions of the plurality of heat exchange modules, and the support structures support the heat exchange modules so that they are suspended at a target height; The supporting structure includes a channel steel, a supporting plate and a heat insulation layer. The channel steel supports the supporting plate, and the heat insulation layer semi-encloses or fully surrounds the channel steel.

5. The sulfur furnace waste heat recovery system according to claim 4 is characterized in that: The sulfur furnace is a horizontal device, the smoke inlet of the heat exchange tower is arranged at the bottom of its side wall, the central axis of the smoke inlet coincides with the central axis of the smoke outlet of the sulfur furnace, and the smoke inlet of the heat exchange tower is connected to the smoke outlet of the sulfur furnace; A smoke outlet is provided at the top of the heat exchange tower. The smoke outlet is arranged above the heat exchange module at the highest position in the vertical direction. The smoke outlet is connected to the sulfur tail gas treatment device.

6. The sulfur furnace waste heat recovery system according to claim 5, characterized in that: The heat exchange tower is divided into an upper space and a lower space along the vertical direction, the support structure located in the upper space is set as an upper support structure, and the support structure located in the lower space is set as a lower support structure; The heat insulation layer of the upper support structure is a heat-insulating cotton layer, which wraps the outer side surface and bottom surface of the channel steel, and the top surface of the channel steel supports the support plate.

7. The sulfur furnace waste heat recovery system according to claim 6, characterized in that: The heat insulation layer of the lower support structure includes a first refractory mud layer and a second refractory mud layer; The second refractory mud layer wraps the outer side surface and bottom surface of the channel steel, the top surface of the channel steel supports the support plate, the first refractory mud layer covers the top surface of the channel steel, and the support plate is clamped between the first refractory mud layer and the second refractory mud layer.

8. The sulfur furnace waste heat recovery and utilization system according to claim 1, characterized in that: The inner wall of the heat exchange tower is covered with an aluminum silicate insulation layer.

9. The sulfur furnace waste heat recovery system according to claim 1, characterized in that: The heat exchange module is a serpentine tube heat exchanger; the cooling module is a fin tube heat exchanger and a plurality of fans, and a plurality of fans blowing upwards are arranged at the bottom of the fin tube heat exchanger.

10. The sulfur furnace waste heat recovery system according to claim 1, characterized in that: The heat exchange tower is provided with a plurality of soot blowing interfaces along the vertical direction, and the number of the soot blowing interfaces corresponds to the number of the heat exchange modules; The outer side wall of the heat exchange tower is provided with a lifting lug.

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