Incineration flue gas heat exchange pipeline and treatment system

Abstract

The utility model provides a kind of incineration flue gas heat exchange pipeline and processing system, and the incineration flue gas heat exchange pipeline includes main flue gas channel, bypass flue gas channel, mixed temperature adjusting flue and linkage temperature control assembly, and heat exchange component is equipped on main flue gas channel, for heat exchange cooling;Bypass flue gas channel is arranged in the side of main flue gas channel;Mixed temperature adjusting flue is connected with the flue gas conveying tail end of main flue gas channel and bypass flue gas channel, for mixing the flue gas of main flue gas channel and bypass flue gas channel and conveying.The utility model adjusts the flue gas flow of entering main flue gas channel and bypass flue gas channel by linkage temperature control assembly, carries out flue gas cooling in main flue gas channel, does not carry out cooling in bypass flue gas channel, then mixes two flue gases in mixed temperature adjusting flue, mixes different flow high-low temperature flue gas, carries out temperature adjusting, to regulate and control the flue gas temperature obtained after heat exchange, can effectively control the temperature fluctuation amplitude of last output flue gas, so that its temperature fluctuation range meets the required of subsequent process.

Description

Technical Field

[0001] This utility model relates to the field of flue gas treatment technology, specifically to a heat exchange pipeline and treatment system for incineration flue gas. Background Technology

[0002] Incineration (such as the incineration of municipal solid waste, hazardous waste, or biomass) generates a large amount of high-temperature flue gas. This flue gas must be cooled before entering subsequent purification processes (such as deacidification, denitrification, and dust removal) to ensure the normal operation of the purification equipment and compliance with emission standards. The waste heat from the combustion flue gas has certain reuse value. For example, Chinese patent CN 222468631 U discloses a waste incineration flue gas treatment system, in which a gas-to-gas heat exchanger is connected to a wet electrostatic precipitator, a hot air furnace, a fan, and a chimney.

[0003] Because the composition and calorific value of the incinerated materials are unstable, the flue gas volume and temperature fluctuate frequently. As a result, the temperature of the flue gas after heat exchange is difficult to stabilize within the precise range required by subsequent processes (especially semi-dry deacidification towers). Excessive temperature will lead to a decrease in deacidification reaction efficiency and an increase in material consumption; excessively low temperature will also pose a risk of condensation corrosion. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a combustion flue gas heat exchange pipeline and treatment system to solve the technical problem of large fluctuations in flue gas volume and temperature in the prior art.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: In a first aspect, this utility model provides a heat exchange pipeline for incineration flue gas, comprising: The main flue gas duct is equipped with heat exchange components for heat exchange and cooling. A bypass flue is provided on one side of the main flue; A mixing and temperature-regulating flue, connected to the flue gas delivery tail ends of the main flue and the bypass flue, is used to mix and deliver the flue gas from the main flue and the bypass flue; and The linkage temperature control component is installed at the conveying head end of the main flue gas duct and the bypass flue gas duct. It has a movable valve plate end, which can be moved to switch the degree of blocking of the main flue gas duct and the bypass flue gas duct, and is used to linkage adjust the flue gas flow of the main flue gas duct and the bypass flue gas duct.

[0006] In some embodiments, the linkage temperature control assembly includes a telescopic mechanism, a main connecting pipe, two branch pipes, and a valve plate assembly. One end of the main connecting pipe is connected to a flue gas discharge pipe. The two branch pipes are connected in parallel to the other end of the main connecting pipe and are respectively connected to the main flue gas duct and the bypass flue gas duct. The telescopic mechanism is mounted on the main connecting pipe, and its telescopic end is connected to the valve plate assembly to drive the valve plate assembly to telescopically move. One side of the valve plate assembly abuts against the ends of the two branch pipes.

[0007] In some embodiments, the connecting main pipe includes a main pipe body and a split pipe body. An opening is provided on one side of the main pipe body, and the split pipe body is detachably installed on the opening. The telescopic mechanism is installed on the split pipe body, so that the telescopic mechanism and the split pipe body can be detached from the side of the pipeline.

[0008] In some embodiments, the valve plate assembly includes an inner core plate and an outer outer plate. The inner core plate is fixedly connected to the telescopic end of the telescopic mechanism, and the outer outer plate is sleeved on the outside of the inner core plate and detachably connected to the inner core plate by bolts.

[0009] In some embodiments, the outer jacket is provided with a sealing gasket on the side near the branch pipe.

[0010] In some embodiments, the outer jacket has an arc surface on the side away from the branch pipe that transitions towards the branch pipes on both sides.

[0011] In some embodiments, the heat exchange assembly includes a plurality of heat exchange tubes that penetrate the main flue gas duct, and the heat exchange tubes are provided with a heat exchange medium inlet and a heat exchange medium outlet for the heat exchange medium to flow in and out, respectively.

[0012] In some embodiments, a reversing valve is connected to both the heat exchange medium inlet and the heat exchange medium outlet. The two reversing valves are respectively connected to a preheating medium inlet pipeline and a preheating medium outlet pipeline for introducing high-temperature steam to preheat the heat exchange tube.

[0013] In some embodiments, a controller is also included, wherein a temperature sensor is provided in the mixed temperature regulating flue, and the controller is electrically connected to both the temperature sensor and the telescopic mechanism.

[0014] Secondly, this utility model also provides an incineration flue gas treatment system, including an incineration flue gas heat exchange pipeline as described in any of the above.

[0015] Compared with the prior art, the incineration flue gas heat exchange pipeline provided by this utility model regulates the flow rate of flue gas entering the main flue gas duct and the bypass flue gas duct through a linkage temperature control component. The flue gas is cooled in the main flue gas duct, but not in the bypass flue gas duct. Then, the two flue gases are mixed in a mixing and temperature-regulating flue gas duct. The high and low temperature flue gases with different flow rates are mixed and the temperature is adjusted to regulate the flue gas temperature obtained after heat exchange. This can effectively control the temperature fluctuation range of the final output flue gas, so that its temperature fluctuation range meets the requirements of subsequent processes. Attached Figure Description

[0016] Figure 1 This is a three-dimensional view of the incineration flue gas heat exchange pipeline provided in this embodiment of the utility model; Figure 2 This is a partial cross-sectional view of the incineration flue gas heat exchange pipeline provided in an embodiment of this utility model; Figure 3 This is another three-dimensional view of the incineration flue gas heat exchange pipeline provided in this embodiment of the utility model; Figure 4 This is a three-dimensional exploded view of the incineration flue gas heat exchange pipeline provided in this embodiment of the utility model; Figure 5 This is a top sectional view of the combustion flue gas heat exchange pipeline provided in this embodiment of the utility model; Figure 6 This is a control block diagram of the incineration flue gas heat exchange pipeline provided in an embodiment of this utility model.

[0017] Explanation of reference numerals in the attached figures: 1. Main flue gas duct; 2. Heat exchange assembly; 21. Heat exchange tube; 201. Heat exchange medium inlet; 202. Heat exchange medium outlet; 203. Reversing valve; 204. Preheating medium inlet pipeline; 205. Preheating medium outlet pipeline; 3. Bypass flue; 4. Mixed temperature-regulating flue; 5. Linkage temperature control assembly; 51. Telescopic mechanism; 52. Connecting main pipe; 521. Main pipe body; 522. Disassembled pipe body; 53. Diverter secondary pipe; 54. Valve plate assembly; 541. Inner core plate; 542. Outer plate; 543. Sealing gasket; 544. Curved surface; 6. Controller; 7. Temperature sensor. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] To address the technical problem of large fluctuations in flue gas volume and temperature, this invention provides a combustion flue gas heat exchange pipeline. This pipeline allows for the regulation of flue gas flow rates into the main flue gas duct and the bypass flue gas duct via a linked temperature control component. Flue gas is cooled in the main flue gas duct but not in the bypass flue gas duct. The two flue gas streams are then mixed in a mixing and temperature-regulating flue gas duct, where high and low temperature flue gas at different flow rates are mixed and their temperature adjusted. This effectively controls the temperature fluctuation range of the final output flue gas, ensuring that the temperature fluctuation range meets the requirements of subsequent processes.

[0020] It should be noted that the incineration flue gas heat exchange pipeline described in this utility model is used for, but not limited to, the treatment of flue gas generated from the incineration of hazardous waste. For ease of explanation, this utility model only uses the application of the incineration flue gas heat exchange pipeline to the treatment of flue gas generated from the incineration of hazardous waste as an example. The principle of the incineration flue gas heat exchange pipeline applied to other types of equipment is essentially the same as that applied to the treatment of flue gas generated from the incineration of hazardous waste, and will not be elaborated here.

[0021] Please see Figure 1-6 This utility model provides a combustion flue gas heat exchange pipeline, which includes a main flue gas duct 1, a bypass flue gas duct 3, a mixing and temperature-regulating flue gas duct 4, and a linkage temperature control component 5. The main flue gas duct 1 is equipped with a heat exchange component 2 for heat exchange and cooling, cooling the high-temperature flue gas, and utilizing waste heat. It mainly introduces air or water to heat the air or water for use within the plant area. The bypass flue gas duct 3 is located on one side of the main flue gas duct 1, forming a dual flue gas flow path with the main flue gas duct 1. The mixing and temperature-regulating flue gas duct 4 is connected to the flue gas delivery tail end of the main flue gas duct 1 and the bypass flue gas duct 3. The connection is used to mix and transport the flue gas from the main flue gas duct 1 and the bypass flue gas duct 3, merging the flue gas from the two ducts. By mixing the two flue gas streams with different temperatures, the purpose of flue gas temperature adjustment is achieved. The linkage temperature control component 5 is installed at the conveying head end of the main flue gas duct 1 and the bypass flue gas duct 3, and has a movable valve plate end. The movement of the valve plate end switches the degree of blocking of the main flue gas duct 1 and the bypass flue gas duct 3, which is used to linkage adjust the flue gas flow of the main flue gas duct 1 and the bypass flue gas duct 3. During the movement of the valve plate end, the blocking degree and the opening degree are adjusted synchronously to achieve proportional synchronous adjustment.

[0022] Understandably, the main flue gas duct 1 and the bypass flue gas duct 3 have the same dimensions. The valve plate end can block at least one of the flue gas ducts. When the valve plate end moves, if the main flue gas duct 1 is blocked by 50% of its cross-sectional area, then the bypass flue gas duct 3 is blocked by 50% of its cross-sectional area; if the main flue gas duct 1 is blocked by 20% of its cross-sectional area, then the bypass flue gas duct 3 is blocked by 80% of its cross-sectional area, and so on, to achieve the purpose of controlling the flue gas flow rate entering the two flue gas ducts.

[0023] It should be noted that when the final flue gas temperature rises, the main path opening is increased while the bypass opening is decreased. A larger proportion of the flue gas is guided through the main path heat exchanger for cooling, while a smaller proportion of the high-temperature bypass flue gas is mixed in, thus lowering the overall temperature after mixing and returning to the set value. When the final flue gas temperature decreases, the main path opening is decreased while the bypass opening is increased. A smaller proportion of the flue gas is cooled, while a larger proportion of the high-temperature flue gas is directly mixed in, thus raising the overall temperature after mixing and returning to the set value. When the total flue gas flow rate increases, the flow rate and velocity of the flue gas flowing through the main path heat exchanger increase, which may lead to a decrease in the outlet temperature due to more efficient heat exchange. The main path opening is decreased while the bypass opening is increased to offset the temperature decrease and stabilize it at the set value. When the total flue gas flow rate decreases, less flue gas flows through the main path, which may weaken the cooling effect and cause the final temperature to tend to rise. The main path opening is increased while the bypass opening is decreased to increase the cooling ratio and pull the temperature back to the set value.

[0024] In one embodiment, please refer to Figure 2 and Figure 4 To control the flow rate and proportion of flue gas, the linkage temperature control component 5 includes a telescopic mechanism 51, a connecting main pipe 52, two diversion sub-pipes 53, and a valve plate assembly 54. One end of the connecting main pipe 52 is connected to the flue gas discharge pipe to introduce flue gas. The two diversion sub-pipes 53 are connected side-by-side to the other end of the connecting main pipe 52 and are respectively connected to the main flue gas duct 1 and the bypass flue gas duct 3 to divert the introduced flue gas. The telescopic mechanism 51 is installed on the connecting main pipe 52, and its telescopic end is connected to the valve plate assembly 54, driving the valve plate assembly 54 to move telescopically. One side of the valve plate assembly 54 abuts against the ends of the two diversion sub-pipes 53. By moving and blocking the valve plate assembly 54, the blocking degree of the two diversion sub-pipes 53 is adjusted, thereby achieving the purpose of adjusting the flow opening of the pipeline and adjusting the flow rate ratio of flue gas entering the main flue gas duct 1 and the bypass flue gas duct 3.

[0025] Furthermore, to facilitate the disassembly and maintenance of the valve plate assembly 54 and the telescopic mechanism 51, the connecting main pipe 52 includes a main pipe body 521 and a split pipe body 522. An opening is provided on one side of the main pipe body 521, and the split pipe body 522 is detachably installed on the opening by bolts. The telescopic mechanism 51 is installed on the split pipe body 522, so that the telescopic mechanism 51 and the split pipe body 522 can be disassembled from the side of the pipeline, thereby allowing the valve plate assembly 54 to be pulled out from the main pipe body 521, and the valve plate assembly 54 and the telescopic mechanism 51 can be disassembled and maintained.

[0026] Understandably, a sealing ring is provided between the split tube body 522 and the main tube body 521 to seal the gap; the telescopic mechanism 51 can adopt existing equipment with linear telescopic function such as hydraulic push rod, and is not limited to this.

[0027] Furthermore, to facilitate the replacement of the valve plate, the valve plate assembly 54 includes an inner core plate 541 and an outer sleeve plate 542. The inner core plate 541 is fixedly connected to the telescopic end of the telescopic mechanism 51. The outer sleeve plate 542 is sleeved on the outside of the inner core plate 541 and is detachably connected to the inner core plate 541 by bolts. The bolts are embedded in the end of the outer sleeve plate 542 and threaded through the outer sleeve plate 542 to the corresponding end of the inner core plate 541, thereby locking the outer sleeve plate 542 onto the inner core plate 541.

[0028] The main pipe 521 and the split pipe 522 are provided with sliding grooves on their inner top and bottom walls. The valve plate assembly 54 is slidably connected to the sliding grooves to guide the sliding movement and to provide leeward support for the valve plate assembly 54, thereby improving structural stability.

[0029] Furthermore, in order to provide a seal between the valve plate and the diversion sub-pipe 53, a sealing gasket 543 is provided on the side of the outer jacket 542 near the diversion sub-pipe 53, and the seal is achieved by the sealing gasket 543.

[0030] Furthermore, in order to guide the flue gas to flow to both sides, the outer jacket plate 542 is provided with an arc surface 544 on the side away from the diversion sub-pipe 53, which transitions to the diversion sub-pipes 53 on both sides.

[0031] In one embodiment, please refer to Figure 1 and Figure 3 To provide heat exchange, the heat exchange assembly 2 includes several heat exchange tubes 21 that penetrate the main flue gas duct 1. Each heat exchange tube 21 is provided with a heat exchange medium inlet 201 and a heat exchange medium outlet 202, which are used for the inflow and outflow of the heat exchange medium, respectively. The heat exchange tube 21 is composed of multiple tube bodies that penetrate the main flue gas duct 1 from top to bottom, horizontal tubes that connect single rows of tube bodies, and vertical tubes that connect multiple horizontal tubes. The heat exchange medium inlet 201 and the heat exchange medium outlet 202 are set on the corresponding vertical tubes. After the medium is introduced, it flows through the heat exchange tubes 21 in sequence and is discharged from the heat exchange medium outlet 202, thus circulating for heat exchange.

[0032] Furthermore, to avoid low-temperature adhesion due to the low temperature of the heat exchange tubes 21 during startup, and because the large number of heat exchange tubes 21 results in a relatively small internal flow space in the main flue gas duct 1, excessive low-temperature adhesion during startup can easily lead to blockage of the main flue gas duct 1 or reduced heat exchange efficiency due to scaling of the heat exchange tubes 21. Therefore, to solve the above problems, a reversing valve 203 is connected to both the heat exchange medium inlet 201 and the heat exchange medium outlet 202 of the heat exchange tubes 21. The two reversing valves 203 are respectively connected to a preheating medium inlet pipe 204 and a preheating medium outlet pipe 205, which are used to introduce high-temperature steam to preheat the heat exchange tubes 21. Preheating is achieved by continuously introducing high-temperature steam for a period of time to heat the heat exchange tubes 21, preventing their temperature from becoming too low and reducing the possibility of low-temperature adhesion.

[0033] In one embodiment, please refer to Figure 1 , Figure 5 and Figure 6 In order to drive the actuator to extend or retract according to the mixing temperature, a controller 6 is also included. A temperature sensor 7 is provided in the mixing temperature regulating flue 4. The controller 6 is electrically connected to the temperature sensor 7 and the extension mechanism 51. Based on the temperature of the mixed flue gas fed back by the temperature sensor 7, the controller 6 controls the extension or retraction of the extension mechanism 51 according to the temperature value. The extension and retraction correspondingly adjust the opening ratio of the valve plate assembly 54 to the two flues.

[0034] Understandably, after the expansion and contraction adjustment, the flue gas ratio changes, and the corresponding mixing temperature will change. Therefore, the expansion and contraction actions corresponding to the temperature rise and fall can achieve the effect of heating and cooling. When the temperature reaches the corresponding temperature range, the expansion and contraction action will stop. The above control method is an existing mature conventional control method, which will not be elaborated here.

[0035] This utility model also provides an incineration flue gas treatment system, including an incineration flue gas heat exchange pipeline as described in any of the above embodiments, which can be installed in any pipeline in the incineration flue gas treatment system that requires temperature control, and is particularly suitable for installation at the initial discharge of flue gas for cooling and heat exchange, and waste heat utilization.

[0036] It is understandable that the steps of different current process flows are somewhat different. Therefore, there are different processes and sequences for cooling. However, when temperature control is required, the above-mentioned incineration flue gas heat exchange pipelines can be used to regulate the temperature of the final flue gas while recovering waste heat.

[0037] To better understand this utility model, the following is combined with... Figures 1 to 6The technical solution of this utility model is described in detail as follows: Flue gas is introduced into the connecting main pipe 52. Under the separation and guidance of the valve plate assembly 54, the flue gas flows into the two side branch pipes 53 in proportion, and then flows into the main flue gas duct 1 and the bypass flue gas duct 3 respectively. The heat exchange component 2 in the main flue gas duct 1 exchanges heat and cools the flue gas. The cooled flue gas is mixed with the high-temperature flue gas in the bypass flue gas duct 3 in the mixing and temperature regulating flue gas duct 4 to regulate the final outlet flue gas temperature. If the outlet temperature decreases, the main circuit opening is reduced and the bypass opening is increased to offset the temperature drop and stabilize it at the set value. If the temperature rises, the main circuit opening is increased and the bypass opening is decreased to increase the cooling ratio and pull the temperature back to the set value. Before starting, the reversing valve 203 is controlled to switch the passage to connect to the preheating pipeline. High-temperature steam is introduced into the preheating medium inlet pipeline 204 through the high-temperature steam generator and flows through each heat exchange tube 21 for preheating. After preheating, the original pipeline is switched back.

[0038] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A heat exchange pipeline for incineration flue gas, characterized in that, include: The main flue gas duct is equipped with heat exchange components for heat exchange and cooling. A bypass flue is provided on one side of the main flue; A mixing and temperature-regulating flue is connected to the flue gas delivery tail end of the main flue gas duct and the bypass flue gas duct, and is used to mix and deliver the flue gas from the main flue gas duct and the bypass flue gas duct. as well as The linkage temperature control component is installed at the conveying head end of the main flue gas duct and the bypass flue gas duct. It has a movable valve plate end, which can be moved to switch the degree of blocking of the main flue gas duct and the bypass flue gas duct, and is used to linkage adjust the flue gas flow of the main flue gas duct and the bypass flue gas duct.

2. The incineration flue gas heat exchange pipeline according to claim 1, characterized in that, The linkage temperature control component includes a telescopic mechanism, a main connecting pipe, two branch pipes, and a valve plate assembly. One end of the main connecting pipe is used to connect to the flue gas discharge pipe. The two branch pipes are connected side by side to the other end of the main connecting pipe. The two branch pipes are respectively connected to the main flue gas duct and the bypass flue gas duct. The telescopic mechanism is installed on the main connecting pipe, and its telescopic end is connected to the valve plate assembly, driving the valve plate assembly to telescopically move. One side of the valve plate assembly abuts against the ends of the two branch pipes.

3. The incineration flue gas heat exchange pipeline according to claim 2, characterized in that, The main connecting pipe includes a main pipe body and a split pipe body. An opening is provided on one side of the main pipe body. The split pipe body is detachably installed on the opening. The telescopic mechanism is installed on the split pipe body, so that the telescopic mechanism and the split pipe body can be detached from the side of the pipeline.

4. The incineration flue gas heat exchange pipeline according to claim 2, characterized in that, The valve plate assembly includes an inner core plate and an outer outer plate. The inner core plate is fixedly connected to the telescopic end of the telescopic mechanism, and the outer outer plate is sleeved on the outside of the inner core plate and detachably connected to the inner core plate by bolts.

5. The incineration flue gas heat exchange pipeline according to claim 4, characterized in that, The outer jacket is provided with a sealing gasket on the side near the branch pipe.

6. The incineration flue gas heat exchange pipeline according to claim 4, characterized in that, The outer jacket has an arc surface on the side away from the branch pipe that transitions towards the branch pipes on both sides.

7. The incineration flue gas heat exchange pipeline according to claim 1, characterized in that, The heat exchange assembly includes several heat exchange tubes that pass through the main flue gas duct. Each heat exchange tube is provided with a heat exchange medium inlet and a heat exchange medium outlet, which are used for the heat exchange medium to flow in and out, respectively.

8. The incineration flue gas heat exchange pipeline according to claim 7, characterized in that, Both the heat exchange medium inlet and outlet are connected to a reversing valve. The two reversing valves are respectively connected to a preheating medium inlet pipeline and a preheating medium outlet pipeline, which are used to introduce high-temperature steam to preheat the heat exchange tube.

9. The incineration flue gas heat exchange pipeline according to claim 2, characterized in that, It also includes a controller, and a temperature sensor is provided in the mixed temperature regulating flue. The controller is electrically connected to both the temperature sensor and the telescopic mechanism.

10. A flue gas treatment system for incineration, characterized in that, Including the incineration flue gas heat exchange pipeline as described in any one of claims 1-9.

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