Flue gas waste heat recovery device

Abstract

The flue gas waste heat recovery device comprises a flow guide barrel, an outer barrel and an outlet smoke pipe which are fixedly connected in sequence, the flow guide barrel is used for being connected with a flue gas pipeline, a spark extinguishing promoting structure capable of promoting smoke sparks to be extinguished is arranged in the flow guide barrel, and a heat exchange unit and a cleaning unit are arranged in the outer barrel; the heat exchange unit is used for absorbing heat of smoke through heat exchange, the cleaning unit is connected with a purging air source and used for purging soot in the smoke through compressed air provided by the purging air source, and in the process that the smoke passes through the spark extinguishing promoting structure, the heat exchange unit and the cleaning unit, the flowing area of the smoke changes so as to achieve the silencing effect. According to the invention, the integration of smoke spark extinguishing, noise reduction and smoke heat exchange functions is realized in a very small space, the smoke waste heat is utilized on the premise of ensuring the ship noise environment and the operation safety of the diesel engine, and the overall energy utilization rate of the diesel engine is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of offshore oil drilling equipment, and in particular relates to a flue gas waste heat recovery device. Background Art

[0002] In the field of offshore oil drilling equipment technology, diesel engines are an indispensable power equipment. How to effectively improve the comprehensive utilization efficiency of diesel has always been the focus of research. In the normal operation of diesel engines, in addition to the normal conversion into electrical energy, most of the heat will be discharged into the air with the flue gas, causing energy waste and environmental pollution. In order to improve the thermal utilization efficiency of diesel engines, flue gas waste heat recovery technology came into being.

[0003] Although the existing flue gas waste heat recovery devices can recover the heat energy in the flue gas to a certain extent, they generally have some shortcomings. For example, most of them are currently combined with silencer and spark extinguisher, and the heat exchange part is set separately. The separate installation of the heat exchange part not only takes up space but also has a great impact on the diesel engine exhaust system, affecting the promotion and application of flue gas waste heat. Summary of the invention

[0004] In order to solve all or part of the above problems, the purpose of the present invention is to provide a flue gas waste heat recovery device that can achieve the diesel engine smoke spark extinguishing and silencing functions while completing the flue gas waste heat recovery to the greatest extent. The flue gas waste heat recovery device of the present invention realizes the above functions within a smaller volume range, solves the problem of small space of the drilling platform diesel engine exhaust system, and realizes the maximum recovery and utilization of flue gas waste heat while ensuring the safe and reliable operation of the diesel engine, thereby improving the overall energy utilization rate of the diesel engine.

[0005] According to one aspect of the present invention, a flue gas waste heat recovery device is provided, comprising a guide barrel, an outer cylinder and an outlet smoke pipe fixedly connected in sequence, wherein the guide barrel is used to be connected to the flue gas duct, and a spark extinguishing promotion structure capable of extinguishing smoke sparks is arranged in the guide barrel, and a heat exchange unit and a cleaning unit are arranged in the outer cylinder, and the heat exchange unit is used to absorb the heat of the flue gas through heat exchange, and the cleaning unit is connected to a purge air source, and the cleaning unit is used to use the compressed air provided by the purge air source to purge the soot in the flue gas, and in the process of the smoke passing through the spark extinguishing promotion structure, the heat exchange unit and the cleaning unit, the flow area of ​​the smoke will change to achieve a silencing effect.

[0006] Furthermore, the spark extinguishing structure includes a plurality of first smoke guide plates fixed in the guide barrel, and the plurality of first smoke guide plates are bent to cause the smoke to produce a swirl effect. Under the swirl effect, the smoke collides with the guide barrel and the outer cylinder to cause the smoke sparks to be extinguished. Guide rings are arranged in the plurality of first smoke guide plates, and at least one of the first smoke guide plates is fixedly connected to the guide ring. The end of the guide ring close to the smoke duct is a closed end. Along the flow direction of the smoke, the diameter of the guide ring gradually increases, and the setting of the guide barrel, the plurality of first smoke guide plates and the guide ring causes the flow area to change in the process of the smoke passing through the spark extinguishing structure.

[0007] Furthermore, the guide barrel includes an inlet smoke pipe and a guide cone barrel, one end of the guide cone barrel is fixedly connected to one end of the inlet smoke pipe, the other end of the inlet smoke pipe is used to connect to the smoke duct, the other end of the guide cone barrel is fixedly connected to the outer tube, the lower end of the guide ring is located in the inlet smoke pipe, and the upper end of the guide ring extends into the guide cone barrel; a plurality of the first smoke guide plates are fixed to the inner wall of the guide cone barrel, a second smoke guide plate is fixedly connected to the inlet smoke pipe, the second smoke guide plate extends into the guide cone barrel, and the inner diameter of the guide cone barrel gradually increases along the flow direction of the smoke.

[0008] Furthermore, an inner cylinder is fixedly connected to the upper end of the guide ring, and the inner cylinder extends into the outer cylinder. The heat exchange unit and the cleaning unit are both located in the annular space between the inner cylinder and the outer cylinder.

[0009] Furthermore, the heat exchange unit includes at least one heat exchange coil and a corresponding number of supporting flat steel groups, one end of all the heat exchange coils are connected to the heat exchange input pipe, and the other end of all the heat exchange coils are connected to the heat exchange output pipe, the heat exchange input pipe and the heat exchange output pipe are interconnected to form a closed pipeline, and the closed pipeline is filled with heat exchange medium; each group of the supporting flat steel groups is respectively fixedly connected to a plurality of the coil support baffles, and the plurality of the coil support baffles on each group of the supporting flat steel groups form a spiral structure extending from the lower end of the outer cylinder to the upper end of the outer cylinder, and each of the heat exchange coils is respectively placed on the spiral structure corresponding to a group of the supporting flat steel groups; each group of the supporting flat steel groups is fixed in the outer cylinder; and the setting of the heat exchange coils and the supporting flat steel groups causes the flow area to change during the process of flue gas passing through the heat exchange unit.

[0010] Furthermore, each group of the supporting flat steel groups includes at least two pieces of the coil supporting flat steels, and all the coil supporting flat steels of each group of the supporting flat steel groups are arranged in a circular array with the axis of the outer tube as the center; if the supporting flat steel groups are one group, all the coil supporting flat steels of the group are fixed on the inner wall of the outer tube; if the supporting flat steel groups are two or more groups, the upper end and the lower end of each group of the supporting flat steel groups are respectively fixed on the tube group support plate, each of the tube group support plates is respectively fixedly connected to the tube group fin tube support, and all the coil supporting flat steels of a group of the supporting flat steel groups close to the outer tube are fixed on the inner wall of the outer tube.

[0011] Furthermore, the cleaning unit includes a sootblowing coil, a plurality of sootblowing holes are formed on the sootblowing coil, the sootblowing coil is connected to one end of the sootblower connecting pipe, the purge air source includes a compressed air storage tank composed of a compressed air tank body and a storage tank head, compressed air is stored in the compressed air storage tank, the compressed air storage tank is connected to the other end of the sootblower connecting pipe through an air source connecting pipe, and a ball valve is provided on the air source connecting pipe; a support plate is fixedly connected to the inner wall of the outer cylinder, and the sootblowing coil is placed on the support plate; and the setting of the sootblowing coil causes the flow area to change during the process of the flue gas passing through the cleaning unit.

[0012] Furthermore, the guide barrel is connected to a smoke inlet thermometer via a smoke inlet thermometer pipe, and the smoke inlet thermometer is used to detect the temperature of the smoke entering the guide barrel; the outlet smoke pipe is connected to a smoke outlet thermometer via a smoke outlet thermometer pipe, and the smoke outlet thermometer is used to detect the temperature of the smoke flowing out of the outlet smoke pipe.

[0013] Furthermore, the upper end and the lower end of the outer tube are fixedly connected to a lifting structure, and the lifting structure includes a lifting ear web fixedly connected to the outer wall of the outer tube, and each of the lifting ear webs is fixedly connected to a lifting ear plate.

[0014] Furthermore, the outer wall of the outer cylinder is wrapped with a heat-insulating layer; the outer cylinder is connected to the outlet smoke pipe through an outlet smoke duct connecting ring, and an end of the outlet smoke pipe away from the outer cylinder is connected to an outlet connecting pipe flange.

[0015] It can be seen from the above technical solution that the flue gas waste heat recovery device provided by the present invention has the following beneficial effects:

[0016] The flue gas waste heat recovery device of the present invention realizes functions such as spark extinguishing, heat exchange and silencing within a relatively small volume, solves the problem of small space of the diesel engine exhaust system of the drilling platform, and realizes the maximum recovery and utilization of flue gas waste heat while ensuring the safe and reliable operation of the diesel engine, thereby improving the efficiency of heat energy recovery and the overall energy utilization rate of the diesel engine.

[0017] The flue gas waste heat recovery device of the present invention extracts heat from the diesel engine flue gas to the greatest extent while ensuring the realization of various functions such as spark extinguishing, heat exchange and silencing, and minimizes the impact on the diesel engine flue gas back pressure. In addition, the embodiment of the present invention realizes the integration of flue gas diversion, heat exchange and soot blowing functions in a very small space, effectively solving the problem of excessive space occupied by traditional series application units, solving the problem of insufficient space for on-site equipment installation, and alleviating the complexity of on-site transformation of independent flue gas heat exchangers. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A cross-sectional view of a flue gas waste heat recovery device according to an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of a guide barrel portion of an embodiment of the present invention;

[0020] Figure 3 It is a top view of the guide barrel part of an embodiment of the present invention;

[0021] Figure 4 It is a front view of the lifting structure part of an embodiment of the present invention;

[0022] Figure 5 A top view of an outer cylinder according to an embodiment of the present invention;

[0023] Figure 6 A schematic diagram of a cleaning unit and a compressed air storage tank portion of an embodiment of the present invention;

[0024] Figure 7 Schematic diagram of a heat exchange coil part of an embodiment of the present invention;

[0025] Figure 8 A schematic diagram of a supporting flat steel group according to an embodiment of the present invention;

[0026] Fig. 9 A schematic diagram of an outlet smoke pipe portion of an embodiment of the present invention;

[0027] The accompanying drawings are marked as follows: guide cone 11, first flue gas guide plate 12, guide ring 13, inlet smoke pipe 14, smoke inlet thermometer pipe 15, smoke inlet pipe flange 16, second smoke guide plate 17, outer tube 21, lifting ear belly plate 22, lifting ear plate 23, insulation layer 24, soot blowing coil 31, soot blowing hole 311, soot blowing connection flange 32, soot blower pipe 33, compressed air tank body 34, tank head 35, ball valve 36, inner tube 41, heat exchange coil 42, heat exchange input pipe 43, heat exchange output pipe 44, output pipe flange 45, input pipe flange 46, coil support partition 47, tube group fin tube support 48, tube group support plate 49, coil support flat steel 410, outlet pipe flange 51, outlet smoke pipe 52, smoke outlet thermometer pipe 53, outlet flue connecting ring 54. DETAILED DESCRIPTION

[0028] In order to better understand the purpose, structure and function of the present invention, a flue gas waste heat recovery device of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0029] like Figure 1 As shown, a flue gas waste heat recovery device according to an embodiment of the present invention is shown, comprising a guide barrel, an outer cylinder 21 and an outlet smoke pipe 52 fixedly connected in sequence, wherein the guide barrel is used to be connected to the flue gas duct, and a spark extinguishing promotion structure capable of extinguishing smoke sparks is arranged in the guide barrel, and a heat exchange unit and a cleaning unit are arranged in the outer cylinder 21, and the heat exchange unit is used to absorb the heat of the flue gas through heat exchange, and the cleaning unit is connected to the purge air source, and the cleaning unit is used to use the compressed air provided by the purge air source to purge the soot in the flue gas, and in the process of the smoke passing through the spark extinguishing promotion structure, the heat exchange unit and the cleaning unit, the flow area of ​​the smoke will change to achieve a silencing effect.

[0030] The flue gas waste heat recovery device of this embodiment includes a guide barrel, an outer cylinder 21 and an outlet smoke pipe 52, wherein one end of the outer cylinder 21 is fixedly connected to the guide barrel, and the other end of the outer cylinder 21 is fixedly connected to the outlet smoke pipe 52, and the other end of the guide barrel is used to connect to the smoke pipe, so as to facilitate the smoke with heat in the smoke pipe to enter the space formed by the connection of the guide barrel, the outer cylinder 21 and the outlet smoke pipe 52; the other end of the outlet smoke pipe 52 can be connected to other post-structures as needed, such as connecting to a gas treatment system, so as to realize the purification treatment of the gas discharged from the outlet smoke pipe 52.

[0031] Among them, a spark extinguishing structure that can extinguish smoke sparks is provided in the guide barrel. In the process of smoke passing through the guide barrel, sparks in the smoke are extinguished into ash under the action of the spark extinguishing structure. A heat exchange unit is provided in the outer cylinder 21. The heat exchange unit is used to absorb heat in the smoke through heat exchange, so that this part of heat can be used for other purposes, thereby realizing the recovery and utilization of heat energy. After the smoke gas is guided into the outer cylinder 21 through the guide barrel, the heat of the smoke gas is absorbed by the heat exchange unit through heat exchange, which correspondingly reduces the loss of waste heat of the smoke gas in the air, so that more waste heat of the smoke gas can be converted into useful heat energy, thereby improving the efficiency of heat energy recovery and improving the overall energy utilization rate of the diesel engine.

[0032] A cleaning unit is also provided in the outer cylinder 21, and the cleaning unit is connected to a purge air source. The purge air source is provided outside the outer cylinder 21 to avoid explosion caused by heat absorption and expansion of the gas in the gas source. The purge air source is used to deliver compressed gas to the purge unit when necessary, and the cleaning unit is used to use the compressed air provided by the purge air source to purge the soot in the flue gas, thereby avoiding the accumulation of soot in the outer cylinder 21; thirdly, in the process of the flue gas passing through the spark extinguishing structure, the heat exchange unit and the cleaning unit, its flow area will change to achieve a silencing effect.

[0033] The flue gas waste heat recovery device of the embodiment of the present invention extracts heat from the diesel engine flue gas to the greatest extent while ensuring the realization of various functions, and minimizes the impact on the diesel engine flue gas back pressure. In addition, the embodiment of the present invention realizes the integration of flue gas diversion, heat exchange and soot blowing functions in a very small space, effectively solving the problem of excessive space occupation of traditional series application units, solving the problem of insufficient space for on-site equipment installation, and alleviating the complexity of on-site transformation of independent flue gas heat exchangers.

[0034] In one embodiment, if Figure 2 As shown, the spark extinguishing structure includes a plurality of first smoke guide plates 12 fixed in the guide barrel. The plurality of first smoke guide plates 12 are bent to cause a swirl effect on the smoke. Under the swirl effect, the smoke collides with the guide barrel and the outer cylinder 21 to cause the smoke sparks to be extinguished. A guide ring 13 is arranged in the plurality of first smoke guide plates 12, and at least one first smoke guide plate 12 is fixedly connected to the guide ring 13. The end of the guide ring 13 close to the smoke pipe is a closed end. Along the flow direction of the smoke, the diameter of the guide ring 13 gradually increases. The arrangement of the guide barrel, the plurality of first smoke guide plates 12 and the guide ring 13 causes the flow area of ​​the smoke to change during the process of the smoke passing through the spark extinguishing structure. The change in the smoke flow area correspondingly plays a role in silencing and reducing noise.

[0035] In this embodiment, the first smoke guide plate 12 is fixed in the guide barrel, and the guide ring 13 is located in the annulus surrounded by a plurality of first smoke guide plates 12, and the guide ring 13 is fixed by the first smoke guide plates 12. The setting of the guide ring 13 is used to reduce the space for smoke to flow in the guide barrel, so that the smoke collides with the guide barrel and the outer tube 21 under the cyclone effect, thereby achieving the purpose of extinguishing sparks in the smoke.

[0036] Among them, Figure 2 , Figure 3 As shown, the guide barrel includes an inlet smoke pipe 14 and a guide cone barrel 11, one end of the guide cone barrel 11 is fixedly connected to one end of the inlet smoke pipe 14, the other end of the inlet smoke pipe 14 is used to connect to the smoke duct, the other end of the guide cone barrel 11 is fixedly connected to the outer tube 21, the lower end of the guide ring 13 is located in the inlet smoke pipe 14, and the upper end of the guide ring 13 extends into the guide cone barrel 11; a plurality of first smoke guide plates 12 are fixed to the inner wall of the guide cone barrel 11, and a second smoke guide plate 17 is fixedly connected to the inlet smoke pipe 14, and the second smoke guide plate 17 extends into the guide cone barrel 11, and the inner diameter of the guide cone barrel 11 gradually increases along the flow direction of the smoke.

[0037] In this embodiment, the guide barrel includes an inlet smoke pipe 14 and a guide cone barrel 11, a plurality of first smoke guide plates 12 are fixed to the inner wall of the guide cone barrel 11, and a second smoke guide plate 17 is fixedly connected to the inlet smoke pipe 14, and the second smoke guide plate 17 extends into the guide cone barrel 11. In this embodiment, the second smoke guide plate 17 is further arranged to reduce the flow space of the smoke. In a specific implementation, for example, the second smoke guide plate 17 is a cross-shaped structure. Among them, the other end of the inlet smoke pipe 14 is connected to a smoke inlet pipe flange 16, and the smoke inlet pipe flange 16 is used to connect to the smoke pipe.

[0038] In one embodiment, if Figure 1 As shown, the upper end of the guide ring 13 is fixedly connected with an inner cylinder 41 , the inner cylinder 41 extends into the outer cylinder 21 , and the heat exchange unit and the cleaning unit are both located in the annular space between the inner cylinder 41 and the outer cylinder 21 .

[0039] The inner cylinder 41 of this embodiment is fixedly connected to the upper end of the guide ring 13. The arrangement of the inner cylinder 41 allows the flue gas in the guide barrel to only enter the space between the inner cylinder 41 and the outer cylinder 21, so that the flue gas can exchange heat with the heat exchange unit as much as possible; and a plurality of connecting holes can be arranged on the upper part of the inner cylinder 41 as needed, so that the flue gas cooled after the heat exchange can flow into the inner cylinder 41 through the connecting holes, so that the flue gas can flow forward smoothly.

[0040] In one embodiment, if Figure 7 , Figure 8As shown, the heat exchange unit includes at least one heat exchange coil 42 and a corresponding number of supporting flat steel groups. One end of all the heat exchange coils 42 is connected to the heat exchange input pipe 43, and the other end of all the heat exchange coils 42 is connected to the heat exchange output pipe 44. The heat exchange input pipe 43 and the heat exchange output pipe 44 are interconnected to form a closed pipeline, and the closed pipeline is filled with heat exchange medium; each group of supporting flat steel groups is respectively fixedly connected to a plurality of coil support baffles 47, and the plurality of coil support baffles 47 on each group of supporting flat steel groups form a spiral structure extending from the lower end of the outer tube 21 to the upper end of the outer tube 21, and each heat exchange coil 42 is respectively placed on the spiral structure corresponding to a group of supporting flat steel groups; each group of supporting flat steel groups is fixed in the outer tube 21, and the setting of the heat exchange coils and the supporting flat steel groups causes the flow area of ​​the flue gas to change during the process of the flue gas passing through the heat exchange unit, and the change in the flue gas flow area correspondingly plays a role in silencing and reducing noise.

[0041] Specifically, the heat exchange unit includes at least one heat exchange coil 42, and the heat exchange medium circulates in a closed pipeline formed by a heat exchange input pipe 43, a heat exchange coil 42, and a heat exchange output pipe 44. Specifically, the heat exchange coil 42 is arranged in the flue gas circulation space between the inner tube 41 and the outer tube 21, so the heat exchange medium moves in the heat exchange coil 42 and exchanges heat with the flue gas accordingly, and the heat exchange medium absorbs part of the heat in the flue gas and then heats up. The heated heat exchange medium exchanges heat with other substances and then cools down and absorbs the heat of the flue gas again. In specific implementation, an input pipe flange 46 is connected to one end of the heat exchange input pipe 43 away from the heat exchange coil 42, and an output pipe flange 45 is connected to one end of the heat exchange output pipe 44 away from the heat exchange coil 42. Other pipelines can be connected between the input pipe flange 46 and the output pipe flange 45 so that the heat exchange input pipe 43 is connected to the heat exchange output pipe 44 through other pipelines. The input pipe flange 46 and the output pipe flange 45 can also be directly connected so that the heat exchange input pipe 43 is connected to the heat exchange output pipe 44.

[0042] Again, for the supporting flat steel groups, each group of supporting flat steel groups is arranged between the inner cylinder 41 and the outer cylinder 21, and each group of supporting flat steel groups is fixed in the outer cylinder 21. Figure 8 As shown, when there are multiple groups of supporting flat steel groups, the multiple groups of supporting flat steel groups are arranged in sequence from the inside to the outside between the inner tube 41 and the outer tube 21; a plurality of coil supporting baffles 47 fixedly connected to each group of supporting flat steel groups respectively form a spiral structure extending from the lower end of the outer tube 21 to the upper end of the outer tube 21, and the heat exchange coil 42 is placed on the spiral structure formed by the plurality of coil supporting baffles 47 of the group of supporting flat steel groups.

[0043] The arrangement of the heat exchange coil 42 in this embodiment increases the contact distance between the flue gas and the heat exchange coil 42 during the process of flue gas flowing from bottom to top, thereby improving the effect of heat exchange and achieving the purpose of absorbing the heat in the flue gas to the maximum extent. In addition, during the process of flue gas moving from bottom to top in the outer tube 21, the arrangement of the coil support baffle 47 and the heat exchange coil 42 also plays a role in silencing.

[0044] Each group of support flat steels includes at least two coil support flat steels 410, and all the coil support flat steels 410 of each group of support flat steels are arranged in a circular array with the axis of the outer cylinder 21 as the center. In specific implementation, for example, the group of coil support flat steels 410 includes three, four or five pieces.

[0045] If the supporting flat steel group is one group, all the coil supporting flat steels 410 of the group are fixed on the inner wall of the outer tube 21. If the supporting flat steel group is two or more groups, the upper and lower ends of each supporting flat steel group are respectively fixed on the tube group support plate 49, each tube group support plate 49 is respectively fixedly connected to the tube group fin tube support 48, and all the coil supporting flat steels 410 of the group of supporting flat steel groups close to the outer tube 21 are fixed on the inner wall of the outer tube 21. For the case where there are two or more supporting flat steel groups, as an alternative to fixing the group of supporting flat steel groups close to the outer tube 21 on the inner wall of the outer tube 21, the upper and lower tube group fin tube supports 48 can also be fixed on the inner wall of the outer tube 21.

[0046] Again, refer to the attached Figure 8 , Figure 8 The middle support flat steel group is composed of three groups arranged from the inside to the outside between the inner tube 41 and the outer tube 21. All the coil support flat steels 410 of each support flat steel group are arranged in a circular array with the axis of the outer tube 21 as the center. A plurality of coil support baffles 47 are arranged on each coil support flat steel 410 of each group. All coil support baffles 47 of the group form a spiral structure extending from the lower end of the outer tube 21 to the upper end of the outer tube 21. The upper and lower ends of each coil support flat steel 410 of the three support flat steel groups are respectively fixed on the tube group support plate 49, and each tube group support plate 49 is respectively fixedly connected to the tube group fin tube support 48. In this embodiment, the support flat steel group, the tube group support plate 49 and the tube group fin tube support 48 are arranged so that this part forms an integral structure. Figure 8 All the coil support flat steels 410 of the outermost support flat steel group are fixed on the inner wall of the outer cylinder 21 , thereby achieving the purpose of fixing the entire structure in the outer cylinder 21 .

[0047] Finally, in case that there are two or more supporting flat steel groups, through holes for smoke circulation can be set on the tube group fin tube support 48, or a channel for smoke circulation can be set between the tube group fin tube support 48 and the inner tube 41, or a plurality of connecting holes for connecting the annulus between the inner tube 41 and the outer tube 21 and the space inside the inner tube 41 can be set on the upper part of the inner tube 41. The above settings are all for realizing the smooth flow of smoke, and the above settings can also be combined in specific implementation.

[0048] In one embodiment, if Figure 6 As shown, the cleaning unit includes a sootblowing coil 31, a plurality of sootblowing holes 311 are provided on the sootblowing coil 31, the sootblowing coil 31 is connected to one end of a sootblower pipe 33, and a purge air source includes a compressed air storage tank composed of a compressed air tank body 34 and a storage tank head 35, compressed air is stored in the compressed air storage tank, and the compressed air storage tank is connected to the other end of the sootblower pipe 33 through an air source connecting pipe, and a ball valve 36 is provided on the air source connecting pipe; a support plate is fixedly connected to the inner wall of the outer cylinder 21, and the sootblowing coil 31 is placed on the support plate; and the setting of the sootblowing coil causes the flow area of ​​the flue gas to change during the process of the flue gas passing through the cleaning unit, and the change in the flow area of ​​the flue gas correspondingly plays a role in silencing and reducing noise.

[0049] In this embodiment, the sootblowing coil 31 is a hollow circular ring, and the sootblowing coil 31 is connected to one end of the sootblower pipe 33, and the other end of the sootblower pipe 33 is connected to the air source connecting pipe of the compressed air storage tank through the sootblowing connecting flange 32; the compressed air in the compressed air storage tank enters the circular ring of the sootblowing coil 31 through the sootblower pipe 33, and the several sootblowing holes 311 on the sootblowing coil 31 are used for the compressed air to flow out, and the compressed air is used to blow the waste ash in the flue gas out after it flows out. In this embodiment, a ball valve 36 is provided on the air source connecting pipe, and the setting of the ball valve 36 is used to control the timing of sootblowing. When sootblowing is required, the ball valve 36 is opened to allow compressed air to enter the sootblowing coil 31. In specific implementation, for example, the sootblowing hole 311 is a circular hole with a diameter of 2.1 mm. Among them, a ball valve 36 is also provided at the tank head 35, and the ball valve 36 is opened to replenish air to the compressed air storage tank.

[0050] Again, the inner wall of the outer tube 21 is fixedly connected with a support plate, and the sootblowing coil 31 is placed on the support plate. The support plate in this embodiment is used to support the sootblowing coil 31. Again, in view of the situation where there are two or more supporting flat steel groups, an annulus corresponding to the sootblowing coil 31 is provided on the tube group fin tube support 48.

[0051] In one embodiment, if Figure 2 As shown, the guide barrel is connected to a smoke inlet thermometer through a smoke inlet thermometer pipe 15, and the smoke inlet thermometer is used to detect the temperature of the smoke entering the guide barrel; Fig. 9As shown, the outlet smoke pipe 52 is connected to a smoke outlet thermometer via a smoke outlet thermometer pipe 53 , and the smoke outlet thermometer is used to detect the temperature of the smoke flowing out of the outlet smoke pipe 52 .

[0052] In this embodiment, the smoke inlet thermometer and the smoke outlet thermometer are used to detect the temperature of the corresponding smoke, so as to monitor the operating status of the heat exchange unit in real time.

[0053] In one embodiment, if Figure 5 As shown, the outer wall of the outer cylinder 21 is wrapped with a heat-insulating layer 24. The heat-insulating layer 24 in this embodiment is used to reduce the heat exchange between the flue gas and the outside air. In specific implementation, for example, the heat-insulating layer 24 is made of aluminum silicate wool heat-insulating material.

[0054] In one embodiment, if Figure 4 As shown, the upper and lower ends of the outer cylinder 21 are fixedly connected with a lifting structure, and the lifting structure includes a lifting ear web 22 fixedly connected to the outer wall of the outer cylinder 21, and each lifting ear web 22 is fixedly connected with a lifting ear plate 23. In this embodiment, the lifting ear web 22 and the lifting ear plate 23 are fixed by a welding process, and the lifting ear web 22 is welded to the outer cylinder 21, and the lifting ear plate 23 can be used to connect ropes for lifting or fixing in a narrow space.

[0055] In one embodiment, the outer tube 21 is connected to the outlet smoke pipe 52 through an outlet smoke duct connecting ring 54. The outlet smoke pipe 52 is connected to an outlet pipe flange 51 at one end away from the outer tube 21. The outlet pipe flange 51 in this embodiment is used to connect to other systems.

[0056] For the embodiment of the present invention, when one set of flue gas waste heat recovery devices is used, if the flue gas temperature of the outlet smoke pipe 52 is still high, two sets of flue gas waste heat recovery devices can be provided. The two sets of flue gas waste heat recovery devices are provided as follows: Figure 1 The connection method shown is that the outlet smoke pipe 52 of one group of flue gas waste heat recovery devices is fixedly connected to the guide barrel of another group of flue gas waste heat recovery devices, and the guide barrel of one group of flue gas waste heat recovery devices is connected to the flue gas pipe, and the outlet smoke pipe 52 of the other group of flue gas waste heat recovery devices can be set as needed.

[0057] The flue gas waste heat recovery device of the embodiment of the present invention includes a guide barrel, the upper end of the guide barrel is welded to the outer cylinder 21, a cleaning unit is installed inside the outer cylinder 21, a heat exchange unit is installed above the cleaning unit and inside the outer cylinder 21, the upper end of the outer cylinder 21 is connected to the outlet smoke pipe 52, the outer cylinder 21 has an insulation layer 24, and the outer cylinder 21 tank body is welded with a hoisting structure. A plurality of first smoke guide plates 12 are welded inside the guide barrel shell, a guide ring 13 is connected inside the center of the guide barrel, the cleaning unit passes through the outer cylinder 21 and is connected to the external compressed air storage tank through the soot blower pipe 33, and the ball valve 36 on the air source connecting pipe controls the discharge of the compressed air inside the tank body through the soot blowing coil 31. The heat exchange unit is connected to the heat exchange coil 42 in the outer cylinder 21 through the heat exchange input pipe 43 and the heat exchange output pipe 44, and a plurality of coil support partitions 47 in the outer cylinder 21 play a role in supporting the heat exchange coil 42. The outlet smoke pipe 52 is connected to the upper part of the outer cylinder 21.

[0058] Finally, the flue gas waste heat recovery device of the embodiment of the present invention can absorb the heat in the flue gas, so as to use this part of the heat for other purposes, realize the recovery and utilization of heat energy, and after the flue gas is guided into the outer cylinder 21 through the guide barrel, the heat of the flue gas is absorbed by the heat exchange unit through heat exchange, which correspondingly reduces the loss of flue gas waste heat in the air, so that more flue gas waste heat can be converted into useful thermal energy, thereby improving the efficiency of heat energy recovery and improving the overall energy utilization rate of the diesel engine.

[0059] The flue gas waste heat recovery device of the embodiment of the present invention extracts heat from the diesel engine flue gas to the greatest extent while ensuring the realization of various functions, and minimizes the impact on the diesel engine flue gas back pressure. In addition, the embodiment of the present invention realizes the integration of flue gas diversion, heat exchange and soot blowing functions in a very small space, effectively solving the problem of excessive space occupation of traditional series application units, solving the problem of insufficient space for on-site equipment installation, and alleviating the complexity of on-site transformation of independent flue gas heat exchangers.

[0060] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the invention belongs.

[0061] In addition, the terms "one", "two", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0062] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A flue gas waste heat recovery device, characterized in that: It includes a guide barrel, an outer tube and an outlet smoke pipe which are fixedly connected in sequence, wherein the guide barrel is used to be connected to the smoke duct, and a spark extinguishing promotion structure capable of extinguishing smoke sparks is arranged in the guide barrel, and a heat exchange unit and a cleaning unit are arranged in the outer tube, and the heat exchange unit is used to absorb the heat of the smoke through heat exchange, and the cleaning unit is connected to a purge air source, and the cleaning unit is used to purge the soot in the smoke with the compressed air provided by the purge air source, and in the process of the smoke passing through the spark extinguishing promotion structure, the heat exchange unit and the cleaning unit, the flow area of ​​the smoke will change to achieve a soundproofing effect.

2. The flue gas waste heat recovery device according to claim 1, characterized in that: The spark extinguishing structure includes a plurality of first smoke guide plates fixed in the guide barrel, and the plurality of first smoke guide plates are bent to cause the smoke to produce a swirl effect. Under the swirl effect, the smoke collides with the guide barrel and the outer cylinder to cause the smoke sparks to be extinguished. Guide rings are arranged in the plurality of first smoke guide plates, and at least one of the first smoke guide plates is fixedly connected to the guide ring. The end of the guide ring close to the smoke duct is a closed end. Along the flow direction of the smoke, the diameter of the guide ring gradually increases, and the setting of the guide barrel, the plurality of first smoke guide plates and the guide ring causes the flow area to change during the smoke passing through the spark extinguishing structure.

3. The flue gas waste heat recovery device according to claim 2, characterized in that: The guide barrel includes an inlet smoke pipe and a guide cone barrel, one end of the guide cone barrel is fixedly connected to one end of the inlet smoke pipe, the other end of the inlet smoke pipe is used to connect to the smoke duct, the other end of the guide cone barrel is fixedly connected to the outer cylinder, the lower end of the guide ring is located in the inlet smoke pipe, and the upper end of the guide ring extends into the guide cone barrel; a plurality of the first smoke guide plates are fixed to the inner wall of the guide cone barrel, a second smoke guide plate is fixedly connected to the inlet smoke pipe, the second smoke guide plate extends into the guide cone barrel, and the inner diameter of the guide cone barrel gradually increases along the flow direction of the smoke.

4. The flue gas waste heat recovery device according to claim 2, characterized in that: The upper end of the guide ring is fixedly connected with an inner cylinder, the inner cylinder extends into the outer cylinder, and the heat exchange unit and the cleaning unit are both located in the annular space between the inner cylinder and the outer cylinder.

5. The flue gas waste heat recovery device according to claim 1, characterized in that: The heat exchange unit includes at least one heat exchange coil and a corresponding number of supporting flat steel groups, one end of all the heat exchange coils are connected to the heat exchange input pipe, and the other end of all the heat exchange coils are connected to the heat exchange output pipe, the heat exchange input pipe and the heat exchange output pipe are interconnected to form a closed pipeline, and the closed pipeline is filled with heat exchange medium; each group of the supporting flat steel groups is respectively fixedly connected to a plurality of the coil support baffles, and the plurality of the coil support baffles on each group of the supporting flat steel groups form a spiral structure extending from the lower end of the outer cylinder to the upper end of the outer cylinder, and each of the heat exchange coils is respectively placed on the spiral structure corresponding to a group of the supporting flat steel groups; each group of the supporting flat steel groups is fixed in the outer cylinder; and the arrangement of the heat exchange coils and the supporting flat steel groups causes the flow area of ​​the flue gas to change during the process of passing through the heat exchange unit.

6. The flue gas waste heat recovery device according to claim 5, characterized in that: Each group of the supporting flat steel groups includes at least two pieces of the coil supporting flat steels, and all the coil supporting flat steels of each group of the supporting flat steel groups are arranged in a circular array with the axis of the outer tube as the center; if the supporting flat steel groups are one group, all the coil supporting flat steels of the group are fixed on the inner wall of the outer tube; if the supporting flat steel groups are two or more groups, the upper end and the lower end of each group of the supporting flat steel groups are respectively fixed on the tube group support plate, each of the tube group support plates is respectively fixedly connected to the tube group fin tube support, and all the coil supporting flat steels of a group of the supporting flat steel groups close to the outer tube are fixed on the inner wall of the outer tube.

7. The flue gas waste heat recovery device according to claim 1, characterized in that: The cleaning unit includes a sootblowing coil, a plurality of sootblowing holes are formed on the sootblowing coil, the sootblowing coil is connected to one end of a sootblower pipe, the purge air source includes a compressed air tank composed of a compressed air tank body and a tank head, compressed air is stored in the compressed air tank, the compressed air tank is connected to the other end of the sootblower pipe via an air source connecting pipe, a ball valve is provided on the air source connecting pipe; a support plate is fixedly connected to the inner wall of the outer cylinder, the sootblowing coil is placed on the support plate; and the sootblowing coil is arranged so that the flow area will change during the process of flue gas passing through the cleaning unit.

8. The flue gas waste heat recovery device according to any one of claims 1 to 7, characterized in that: The guide barrel is connected to a smoke inlet thermometer via a smoke inlet thermometer pipe, and the smoke inlet thermometer is used to detect the temperature of the smoke entering the guide barrel; the outlet smoke pipe is connected to a smoke outlet thermometer via a smoke outlet thermometer pipe, and the smoke outlet thermometer is used to detect the temperature of the smoke flowing out of the outlet smoke pipe.

9. The flue gas waste heat recovery device according to claim 8, characterized in that: The upper end and the lower end of the outer tube are both fixedly connected with a lifting structure, and the lifting structure comprises a lifting ear web fixedly connected to the outer wall of the outer tube, and each of the lifting ear webs is fixedly connected with a lifting ear plate.

10. The flue gas waste heat recovery device according to claim 9, characterized in that: The outer wall of the outer cylinder is wrapped with a heat-insulating layer; the outer cylinder is connected to the outlet smoke pipe through an outlet smoke duct connecting ring, and an outlet pipe flange is connected to one end of the outlet smoke pipe away from the outer cylinder.

Images