Boiler waste heat recovery device

Abstract

The application discloses a boiler waste heat recycling device and relates to the technical field of waste heat utilization and environmental protection, which comprises a boiler module and a waste heat recycling module; the waste heat recycling module is used for recycling the heat in flue gas after fuel combustion in the boiler module and recycling the heat for fuel combustion; the waste heat recycling module comprises a protective shell, and a first heat conduction component, a second heat conduction component, a heat exchange component, an air injection component and a pressure increasing component are installed in the protective shell. The application has the advantages that the flue gas waste heat is recycled in two stages, the first stage recycling is used for heating air entering a combustion chamber, reducing invalid heat consumption and improving combustion efficiency, and the second stage recycling is used for increasing the air pressure entering the combustion chamber, so that the contact area of fuel and air is expanded, fuel combustion is more sufficient, the waste heat recycling rate is higher, and the utilization effect is more obvious.

Description

Technical Field

[0001] This invention relates to the field of waste heat utilization and environmental protection technology, and in particular to a boiler waste heat recovery and utilization device. Background Technology

[0002] A boiler is an energy conversion device that uses the heat energy released by fuel combustion or other heat energy to heat the working fluid, water or other fluids, to certain parameters, thereby producing steam or hot water.

[0003] Because a large amount of flue gas is generated during the combustion of fuel in the boiler, and this flue gas contains a lot of heat, in order to reduce energy consumption, it is necessary to recover and utilize the heat in this part of the flue gas. CN213840983U discloses a methanol boiler flue gas waste heat recovery and utilization device, which includes a waste heat recovery adjustment mechanism and an energy circulation loop. The waste heat recovery adjustment mechanism specifically includes an opening adjustment mechanism, an impeller, a pump, a collection pipe, a heat conduction pipe, and a vertically set flue gas discharge cylinder connected to the methanol boiler. The collection pipe is sleeved on the outside of the inlet end of the flue gas discharge cylinder, and the collection pipe and the outer wall of the flue gas discharge cylinder form a closed inner cavity. The outer wall of the flue gas discharge cylinder in the closed inner cavity is wound with a heat conduction pipe. The opening adjustment mechanism is an expansion and contraction throttling fluid set above the collection pipe and on the flue gas discharge cylinder. The expansion and contraction throttling fluid includes a plunger cylinder and an adjusting plunger. The plunger cylinder is connected to the flue gas discharge cylinder.

[0004] The tail end of the regulating plunger is equipped with a piston ring containing a seal. The plunger cylinder contains a regulating plunger forming a pressure storage chamber with a closed lower end. The throttling head of the regulating plunger extends into the flue gas discharge cylinder to achieve throttling adjustment of the opening of the flue gas discharge cylinder's inner diameter cross-sectional area. The closed inner cavity is connected to the pressure storage chamber. The outlet of the heat conduction pipe is connected in series with the pump. The impeller is set inside the flue gas discharge cylinder and corresponds to the opening adjustment throttling position of the regulating plunger throttling head extending into the flue gas discharge cylinder. The impeller drives and connects to the pump. The energy circulation loop is specifically a circulation loop composed of the pump, the collecting pipe, the first capacity regulator, the second capacity regulator, the methanol furnace, and the radiator. The first capacity regulator is set between the methanol furnace outlet and the radiator inlet, and the second capacity regulator is set between the methanol furnace inlet and the radiator outlet. The pump outlet is connected to the first capacity regulator, and the heat conduction pipe inlet is connected to the second capacity regulator.

[0005] The aforementioned methanol boiler flue gas waste heat recovery and utilization device is equipped with a pressure-regulated opening mechanism in the methanol boiler flue gas emission path. A collection pipe is installed at the inlet end of the flue gas emission stack, and a heat-conducting pipe is installed inside the collection pipe to conduct heat. A heated fluid medium connected to the opening mechanism is also installed inside the collection pipe to provide pressure control for regulating the opening mechanism. The opening mechanism can control the accumulation of heat from the throttling flue gas emission and can also affect the impeller to adjust its speed, drive the pump to adjust the heat flow in the heat accumulation zone, and promote the recovery and utilization of waste heat from the flue gas emission. This achieves automatic regulation and recovery of residual heat from the methanol boiler flue gas emission, with sensitive control, high heat transfer efficiency, energy saving and environmental protection.

[0006] However, the steam output efficiency of a methanol boiler is not only related to the water temperature inside the furnace, but also to the completeness of methanol combustion. Recovering waste heat and using it to raise the water temperature is not very effective because the waste heat contains little heat and a lot of it is lost. The water temperature change is small, and the effect on improving the evaporation efficiency of water is not obvious. Moreover, after the water is heated to a certain temperature, generally 60-80 degrees Celsius, it will reach thermal equilibrium with the flue gas. Heat below this temperature cannot be utilized, and a lot of heat loss will still occur.

[0007] Therefore, a new type of boiler waste heat recovery and utilization device can be adopted to overcome the shortcomings of the existing technology. Summary of the Invention

[0008] The purpose of this invention is to solve the problems of low waste heat utilization rate and poor effect on improving steam generation efficiency in the prior art, and to propose a boiler waste heat recovery and utilization device.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A boiler waste heat recovery and utilization device includes a boiler module and a waste heat recovery module.

[0011] The waste heat recovery module is used to recover heat from the flue gas after fuel combustion in the boiler module and utilize it for fuel combustion. The waste heat recovery module includes a protective shell, and a first heat-conducting component, a second heat-conducting component, a heat exchange component, a gas injection component, and a pressurization component are installed inside the protective shell. The heat exchange component is used to recover heat from the flue gas, the second heat-conducting component is used to recover high heat from the flue gas, and the first heat-conducting component is used to utilize the remaining heat in the flue gas after the second heat-conducting component has recovered and utilized it.

[0012] The gas injection component is used to inject gas into the boiler module and uses the heat recovered by the second heat conduction component to heat the gas, thereby improving the fuel combustion efficiency in the boiler module; the pressurization component uses the waste heat recovered by the first heat conduction component to increase the gas pressure of the gas injection component, so that the fuel burns more completely.

[0013] Preferably, the boiler module includes a boiler shell, which is divided into a steam outlet chamber and a combustion chamber. Multiple heating tubes are fixedly installed in the combustion chamber, and a water pump is fixedly installed on the boiler shell for injecting water into the heating tubes. The end of the heating tube away from the water pump extends into the steam outlet chamber. A steam outlet hole is opened on the steam outlet hole, and a steam outlet pipe is fixedly installed on the steam outlet hole.

[0014] A fuel connection pipe is fixedly installed on the boiler shell, and multiple fuel injection heads are fixedly installed inside the boiler shell. Each fuel injection head is located in the combustion chamber, and the multiple fuel injection heads are connected to a gas distribution box. The fuel connection pipe is connected to the gas distribution box. Two air inlets are fixedly installed on the boiler shell, and an air outlet is opened on the boiler shell. An air outlet pipe is fixedly installed on the air outlet, and the air outlet is connected to the combustion chamber.

[0015] Preferably, the heat exchange assembly includes two partitions fixedly installed inside the protective shell, which divide the protective shell into a first chamber, a second chamber, and a third chamber. Each partition has multiple circular holes, and each partition has multiple guide tubes fixedly installed that mate with the corresponding circular holes. The guide tubes on the two partitions are aligned. A heat insulation plate is fixedly installed inside the protective shell, and the heat insulation plate has multiple holes. Each guide tube communicates with a corresponding hole, and the guide tubes on the two partitions do not contact each other. The heat insulation plate divides the third chamber into a first heat exchange zone and a second heat exchange zone. The first heat-conducting component is located in the first heat exchange zone, and the second heat-conducting component is located in the second heat exchange zone. Both the first and second heat exchange zones contain heat exchange fluid.

[0016] Preferably, each of the guide pipes is composed of multiple pipe sections, and a spiral heat-conducting fin is fixedly installed inside each pipe section. The spiral directions of the spiral heat-conducting fins in adjacent pipe sections are opposite.

[0017] Preferably, the second heat-conducting component includes a second heat exchange tube, which is composed of multiple spiral-shaped second pipes. Both ends of the second heat exchange tube are fixedly connected to a second connecting box, and each of the two second connecting boxes is fixedly connected to a one-way pipe. One one-way pipe is exposed, and the other one-way pipe is connected to the gas injection component.

[0018] The first heat-conducting component includes a first heat exchange tube, which is composed of multiple spiral-shaped first pipes. Both ends of the first heat exchange tube are fixedly connected to a first connection box. One of the first connection boxes is fixedly connected to an air pump, and the other first connection box is connected to a pressurization component.

[0019] Preferably, the air injection assembly includes an air outlet box fixedly installed outside the protective shell. The air outlet box is connected to a one-way pipe on the second connecting box. The air outlet box has two air holes. An air inlet pipe is fixedly installed on each of the two air holes. The two air inlet pipes are connected to corresponding air inlet heads. A one-way valve is fixedly installed on each of the two air inlet pipes.

[0020] Preferably, the pressurization assembly includes a fixed perforated plate fixedly installed inside the air outlet box. A slide rod is slidably installed on the fixed perforated plate. A one-way piston disc is fixedly installed at one end of the slide rod. A return spring is fixedly installed between the one-way piston disc and the fixed perforated plate. The end of the slide rod away from the one-way piston disc passes through and extends out of the air outlet box. A reciprocating mechanism that cooperates with the slide rod is installed on the air outlet box.

[0021] Preferably, the air outlet box has a through hole, and a sealing sleeve is fixedly installed in the through hole. The slide rod and the sealing sleeve are slidably connected.

[0022] Preferably, the reciprocating mechanism includes a bracket fixedly mounted on the air outlet box, a shaft rotatably mounted on the bracket, a cam fixedly mounted on the shaft, a ball bearing cooperating with the cam rotatably mounted on the slide rod, a turbofan rotatably mounted on the air outlet box, the central shaft of the turbofan being connected to the shaft via a universal coupling, and a drive structure being installed between the first connecting box (not connected to the air pump) and the turbofan.

[0023] Preferably, the drive structure includes a metal pipe and a jet pipe. One end of the metal pipe is connected to the first connecting box, and the other end is connected to the jet pipe. The turbofan is located at the outlet end of the jet pipe. The jet pipe is divided into a straight section and a converging section. The inner diameter of the straight section is three times the inner diameter of the metal pipe, and the inner diameter of the outlet end of the converging section is one-sixth of the inner diameter of the straight section.

[0024] Compared with existing technologies, the advantages of this invention are:

[0025] 1. When recovering and utilizing the heat in the flue gas after methanol combustion, this boiler waste heat recovery and utilization device injects high-temperature air into the methanol combustion chamber through the air injection component. This not only reduces the moisture in the air but also increases the air temperature, narrows the temperature difference between the air and the combustion chamber, reduces ineffective heat consumption, and improves the effective heat utilization rate. In addition, the hot air can optimize the phase change and mixing process of the fuel through heat transfer and flow field disturbance, avoid incomplete combustion, and make the methanol fuel burn more completely.

[0026] 2. When recovering and utilizing the heat in the flue gas after methanol combustion, this boiler waste heat recovery and utilization device uses a first heat exchange zone and a second heat exchange zone to perform graded recovery of the heat in the flue gas, resulting in lower residual heat in the flue gas and a higher waste heat recovery rate.

[0027] 3. When this boiler waste heat recovery and utilization device recovers and utilizes the heat in the flue gas after methanol combustion, it increases the contact area between the flue gas and the guide pipe by setting spiral heat-conducting fins inside the guide pipe. At the same time, the spiral directions of two adjacent spiral heat-conducting fins are designed to be opposite, which can generate turbulence in the flue gas, accelerate molecular motion, and improve heat conduction efficiency.

[0028] 4. When recovering and utilizing the heat from the flue gas after methanol combustion, this boiler waste heat recovery and utilization device utilizes low-temperature waste heat by setting up jet pipes, and uses a pressurization component to increase the air pressure injected into the combustion chamber. When high-pressure air is injected at high speed, it will form a strong jet entrainment effect in the combustion chamber, entraining the surrounding fuel vapor or atomized droplets into the air jet, thereby increasing the contact area between fuel and oxygen and making combustion more complete. Compared with raising the water temperature, it has a better waste heat utilization effect. Attached Figure Description

[0029] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0030] Figure 1 This is a schematic diagram of the structure of a boiler waste heat recovery and utilization device proposed in this invention;

[0031] Figure 2 for Figure 1 Detailed schematic diagram of the structure after rotation at a certain angle;

[0032] Figure 3 for Figure 1 Detailed schematic diagram of the enlarged structure of the boiler module;

[0033] Figure 4 This is a detailed schematic diagram of the internal structure of the boiler module;

[0034] Figure 5 for Figure 1 Detailed schematic diagram of the enlarged structure of the waste heat recovery module;

[0035] Figure 6 for Figure 5 Detailed schematic diagram of the structure after rotation at a certain angle;

[0036] Figure 7 for Figure 6 Detailed schematic diagram of the structure after the protective shell has been removed;

[0037] Figure 8 for Figure 7 Detailed enlarged structural diagram of the heat exchange component;

[0038] Figure 9 for Figure 8 Detailed enlarged structural diagram of the spiral heat-conducting fins inside the central guide tube machine;

[0039] Figure 10 for Figure 7 A detailed enlarged structural diagram of the components, including the central air pump, the first heat-conducting component, the second heat-conducting component, and the heat exchange component, after they have been rotated at a certain angle.

[0040] Figure 11 for Figure 10 Detailed schematic diagram of the structure of the first and second heat-conducting components after they have been rotated at a certain angle;

[0041] Figure 12 for Figure 11 Detailed enlarged structural diagram of the second heat exchange tube;

[0042] Figure 13 for Figure 10 Detailed enlarged structural diagram of the gas injection assembly and the booster assembly after they have been rotated at a certain angle;

[0043] Figure 14 for Figure 13 Detailed schematic diagram of the structure after the central exhaust box is cut open;

[0044] Figure 15 for Figure 14 Detailed schematic diagram of the machine structure after removing some internal components of the air outlet box;

[0045] Figure 16 for Figure 15 Detailed enlarged structural diagram of the central jet pipe;

[0046] Figure 17 for Figure 16 Detailed diagram of the enlarged structure of section A.

[0047] In the diagram: 1 Boiler module, 2 Waste heat recovery module, 3 Steam outlet pipe, 4 Gas outlet pipe, 5 Water pump, 6 Fuel connection pipe, 7 Air inlet head, 8 Gas outlet hole, 9 Steam outlet hole, 10 Heating pipe, 11 Fuel injection head, 12 Steam outlet chamber, 13 Combustion chamber, 14 Boiler shell, 15 Protective shell, 16 Gas injection assembly, 17 Pressurization assembly, 18 Exhaust pipe, 19 Air inlet pipe, 20 Air pump, 21 First heat conduction assembly, 22 Second heat conduction assembly, 23 First chamber, 24 Second chamber, 25 Heat exchange assembly, 26 Baffle plate, 27 Guide pipe, 28 Spiral heat conduction fin, 29 Second connection box, 30 First heat exchange pipe, 31 Second heat exchange pipe, 32 Gas outlet box, 33 Injection pipe, 34 First connection box, 35 Fixed perforated plate, 36 One-way piston disc, 37 Return spring, 38 Slide rod, 39 Bracket, 40 Ball bearing, 41 Cam, 42 Universal coupling, 43 Turbine fan. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Example 1: Refer to Figures 1-13A boiler waste heat recovery and utilization device includes a boiler module 1 and a waste heat recovery module 2.

[0050] The boiler module 1 includes a boiler shell 14, which is divided into a steam outlet chamber 12 and a combustion chamber 13. Multiple heating tubes 10 are fixedly installed in the combustion chamber 13, and a water pump 5 is fixedly installed on the boiler shell 14 for injecting water into the heating tubes 10. The end of the heating tube 10 away from the water pump 5 extends into the steam outlet chamber 12. A steam outlet hole 9 is opened on the steam outlet hole 9, and a steam outlet pipe 3 is fixedly installed on the steam outlet hole 9.

[0051] A fuel connection pipe 6 is fixedly installed on the boiler shell 14, and multiple fuel injectors 11 are fixedly installed inside the boiler shell 14 (the fuel injectors 11 inject atomized methanol, which has more complete contact with oxygen). Each fuel injector 11 is located in the combustion chamber 13. Multiple fuel injectors 11 are connected to a gas distribution box. The fuel connection pipe 6 is connected to the gas distribution box. Two air inlets 7 are fixedly installed on the boiler shell 14, and an air outlet 8 is opened on the boiler shell 14. An air outlet pipe 4 is fixedly installed on the air outlet 8, and the air outlet 8 is connected to the combustion chamber 13.

[0052] Water pump 5 injects water into heating pipe 10. Methanol is sprayed from fuel injector 11 into combustion chamber 13 through fuel connection pipe 6. It burns in combustion chamber 13. The heat generated by combustion heats the water in heating pipe 10, causing the water to evaporate. The evaporated water vapor enters steam outlet chamber 12 and is then discharged from steam outlet hole 9 and steam outlet pipe 3. The high-temperature flue gas generated by combustion enters waste heat recovery module 2 through steam outlet hole 8 and steam outlet pipe 4. During combustion, air inlet 7 draws in air to provide sufficient oxygen for combustion.

[0053] Waste heat recovery module 2 is used to recover the heat in the flue gas after fuel combustion in boiler module 1 and use it for fuel combustion. Waste heat recovery module 2 includes a protective shell 15. The protective shell 15 is equipped with a first heat conduction component 21, a second heat conduction component 22, a heat exchange component 25, a gas injection component 16 and a pressurization component 17. The heat exchange component 25 is used to recover the heat in the flue gas.

[0054] The heat exchange assembly 25 includes two partitions 26 fixedly installed inside the protective shell 15. The two partitions 26 divide the protective shell 15 into a first chamber 23, a second chamber 24, and a third chamber. Each partition 26 has multiple round holes, and each partition 26 has multiple guide tubes 27 fixedly installed on it, which are aligned with the corresponding round holes. A heat insulation plate is fixedly installed inside the protective shell 15. The heat insulation plate has multiple holes, and each guide tube 27 is connected to the corresponding hole. The guide tubes 27 on the two partitions 26 do not contact each other. The heat insulation plate divides the third chamber into a first heat exchange zone and a second heat exchange zone. A first heat conduction component 21 is located in the first heat exchange zone, and a second heat conduction component 22 is located in the second heat exchange zone. Both the first and second heat exchange zones contain heat exchange fluid.

[0055] The flue gas enters the first chamber 23 through the exhaust pipe 4, then enters the second chamber 24 through the guide pipe 27, and finally exits through the exhaust pipe 18. During the process, the flue gas will come into contact with the spiral heat-conducting plates 28 in the guide pipe 27. Due to the alternating reverse arrangement of the spiral heat-conducting plates 28, the flue gas will generate turbulence, accelerate molecular motion, improve heat exchange efficiency, and transfer the heat in the flue gas to the heat exchange liquid in the first heat exchange zone and the second heat exchange zone more quickly.

[0056] The purpose of the heat insulation plate is to prevent the heat exchange fluids in the first heat exchange zone and the second heat exchange zone from exchanging heat with each other, and to ensure that the temperature of the heat exchange fluid in the first heat exchange zone after heat exchange is lower than that of the heat exchange fluid in the second heat exchange zone. This can reduce the minimum temperature of flue gas heat exchange and reduce heat loss.

[0057] Each guide tube 27 is composed of multiple pipe sections, and a spiral heat-conducting plate 28 is fixedly installed inside each pipe section. The spiral directions of the spiral heat-conducting plates 28 in adjacent pipe sections are opposite.

[0058] The spiral heat-conducting plate 28 can increase the contact area between the flue gas and the guide tube 27. At the same time, the spiral directions of two adjacent spiral heat-conducting plates 28 are designed in opposite directions, which can generate turbulence in the flue gas, accelerate molecular motion, and improve heat conduction efficiency.

[0059] The second heat-conducting component 22 is used to recover high heat from the flue gas;

[0060] The second heat-conducting component 22 includes a second heat exchange tube 31, which is composed of multiple spiral-shaped second pipes. Both ends of the second heat exchange tube 31 are fixedly connected to a second connection box 29. Each of the two second connection boxes 29 is fixedly connected to a one-way pipe, one of which is exposed and the other is connected to the gas injection component 16.

[0061] The one-way tube works in conjunction with the lower pressurization assembly 17 to control the direction of airflow and prevent air backflow.

[0062] The first heat-conducting component 21 is used to utilize the remaining heat in the flue gas after the second heat-conducting component 22 has been recycled;

[0063] The first heat-conducting component 21 includes a first heat exchange tube 30, which is composed of multiple spiral-shaped first pipes. Both ends of the first heat exchange tube 30 are fixedly connected to a first connection box 34. One of the first connection boxes 34 is fixedly connected to an air pump 20, and the other first connection box 34 is connected to a pressurization component 17.

[0064] Both the first heat-conducting component 21 and the second heat-conducting component 22 are designed as spiral pipes, which can increase the contact area between the pipe and the heat exchange fluid, extend the heat exchange time, make the heat exchange more thorough, and make higher utilization of waste heat.

[0065] Example 2: This example differs from Example 1 in that: (Refer to...) Figures 1-2 , Figure 5 , Figure 10 , Figures 14-17 The gas injection component 16 is used to inject gas into the boiler module 1 and use the heat recovered by the second heat conduction component 22 to heat the gas, thereby improving the fuel combustion efficiency in the boiler module 1; the pressurization component 17 uses the waste heat recovered by the first heat conduction component 21 to increase the gas pressure of the gas injection component 16, so that the fuel burns more completely.

[0066] The air injection assembly 16 includes an air outlet box 32 fixedly installed outside the protective shell 15. The air outlet box 32 is connected to a one-way pipe on the second connecting box 29. The air outlet box 32 has two air holes, and an air inlet pipe 19 is fixedly installed on each of the two air holes. The two air inlet pipes 19 are connected to the corresponding air inlet head 7. A one-way valve is fixedly installed on each of the two air inlet pipes 19 (the one-way valve has the same function as the one-way pipe mentioned above, preventing air backflow).

[0067] When methanol burns in combustion chamber 13, it consumes oxygen, which causes negative pressure in combustion chamber 13. At this time, external air is drawn into the exhaust box 32 through the second pipe, and then enters the combustion chamber 13 from the exhaust box 32 through the intake pipe 19 and the intake head 7 to replenish the consumed oxygen.

[0068] During the replenishment process, when the air passes through the second pipe, it is heated by the heat exchange fluid in the second heat exchange zone. Heating causes the moisture in the air to evaporate and increases the speed of oxygen molecules in the air. After the heated air is mixed with methanol, the methanol and oxygen in the air mix more thoroughly, resulting in lower ineffective heat consumption, more complete methanol combustion, and higher combustion efficiency.

[0069] The pressurization assembly 17 includes a fixed perforated plate 35 fixedly installed inside the air outlet box 32. A slide rod 38 is slidably installed on the fixed perforated plate 35. A one-way piston disc 36 is fixedly installed at one end of the slide rod 38. A return spring 37 is fixedly installed between the one-way piston disc 36 and the fixed perforated plate 35. The end of the slide rod 38 away from the one-way piston disc 36 passes through and extends out of the air outlet box 32 (the air outlet box 32 has a through hole, and a sealing sleeve is fixedly installed in the through hole. The slide rod 38 and the sealing sleeve are slidably connected. The purpose of this design is to provide a seal for the sliding of the slide rod 38 and prevent air leakage at the connection between the slide rod 38 and the air outlet box 32. The sealing sleeve is an existing mechanical seal structure, which will not be described in detail here). A reciprocating mechanism that cooperates with the slide rod 38 is installed on the air outlet box 32.

[0070] The movement of the slide bar 38 drives the movement of the one-way piston disc 36 (the one-way piston disc 36 is composed of a piston disc and a one-way pipe, which can only allow air to enter in one direction). As the one-way piston disc 36 moves, the air intake speed is greater than the air output speed, the air pressure in the air outlet box 32 increases, the air output speed increases, and the air output is in a jet state.

[0071] When high-pressure air is injected at high speed, it will form a strong jet entrainment effect in the combustion chamber 13, which will entrain the surrounding fuel vapor or atomized droplets into the air jet, thereby increasing the contact area between fuel and oxygen and making combustion more complete. Compared with raising the water temperature, it has a better waste heat utilization effect.

[0072] The reciprocating mechanism includes a bracket 39 fixedly mounted on the air outlet box 32, a shaft rotatably mounted on the bracket 39, a cam 41 fixedly mounted on the shaft, a ball bearing 40 rotatably mounted on the slide rod 38 that cooperates with the cam 41, a turbo fan 43 rotatably mounted on the air outlet box 32, the central shaft of the turbo fan 43 being connected to the shaft via a universal coupling 42, and a drive structure being installed between the first connecting box 34, which is not connected to the air pump 20, and the turbo fan 43.

[0073] The rotation of the turbofan 43 will drive the shaft to rotate through the universal coupling 42. The rotation of the shaft will drive the cam 41 to rotate. The rotation of the cam 41 will abut against the ball 40, causing the ball 40 to drive the slide rod 38 to move back and forth, thereby achieving the effect of suction.

[0074] The drive structure includes a metal pipe and a jet pipe 33. One end of the metal pipe is connected to the first connecting box 34, and the other end is connected to the jet pipe 33. The turbofan 43 is located at the outlet end of the jet pipe 33. The jet pipe 33 is divided into a straight section and a converging section. The inner diameter of the straight section is three times the inner diameter of the metal pipe, and the inner diameter of the outlet end of the converging section is one-sixth of the inner diameter of the straight section.

[0075] The air pump 20 draws outside air into the metal pipe through the first pipe. When the first pipe passes through the first heat exchange zone, it is heated by the heat exchange liquid in the first heat exchange zone. Then, it is sprayed onto the turbofan 43 through the jet pipe 33, causing the turbofan 43 to rotate. This part utilizes the mechanical power of the air pump 20 and does not utilize the energy in the heated air in the first pipe. Therefore, the jet pipe 33 is used here.

[0076] The straight section of the jet pipe 33: The inner diameter of the straight section is larger than that of the metal pipe. After the air enters the straight section of the jet pipe 33 from the metal pipe, the air expands adiabatically (approximately isentropic process), and its internal energy (heat) is converted into kinetic energy. The flow velocity increases from low speed to high speed jet (such as subsonic speed). At the same time, its own temperature decreases slightly due to expansion (but the initial heat has been converted into kinetic energy, realizing heat utilization). This can increase the kinetic energy of the air, increase the impact force between the air and the turbofan 43, and accelerate the rotation speed of the turbofan 43. This part effectively utilizes the low-temperature waste heat.

[0077] The contraction section of the jet pipe 33: According to A1v1=A2v2, A1 is the cross-sectional area of ​​the jet pipe 33 before contraction, A2 is the cross-sectional area of ​​the jet pipe 33 after contraction, v1 is the airflow velocity inside the jet pipe 33 before contraction, and v2 is the airflow velocity inside the jet pipe 33 after contraction. The cross-sectional area of ​​the contraction section decreases, and the airflow velocity through the contraction section increases, which will increase the impact force with the turbofan 43.

[0078] The specific operating steps of this device are as follows:

[0079] Water pump 5 injects water into heating pipe 10. Methanol is sprayed from fuel injector 11 into combustion chamber 13 through fuel connection pipe 6. It burns in combustion chamber 13. The heat generated by combustion heats the water in heating pipe 10, causing the water to evaporate. The evaporated water vapor enters steam outlet chamber 12 and is then discharged from steam outlet hole 9 and steam outlet pipe 3. The high-temperature flue gas generated by combustion enters waste heat recovery module 2 through steam outlet hole 8 and steam outlet pipe 4. During combustion, air inlet head 7 draws in air to provide sufficient oxygen for combustion.

[0080] The flue gas generated by combustion enters the first chamber 23 through the exhaust pipe 4, then enters the second chamber 24 through the guide pipe 27, and finally exits through the exhaust pipe 18. During the process, the flue gas will come into contact with the spiral heat-conducting plates 28 in the guide pipe 27. Due to the alternating reverse arrangement of the spiral heat-conducting plates 28, the flue gas will generate turbulence, accelerate molecular motion, improve heat exchange efficiency, and transfer the heat in the flue gas to the heat exchange liquid in the first heat exchange zone and the second heat exchange zone more quickly.

[0081] Start the air pump 20. The air pump 20 draws outside air into the metal pipe through the first pipe. When the first pipe passes through the first heat exchange zone, it will be heated by the heat exchange liquid in the first heat exchange zone. Then it is sprayed onto the turbofan 43 through the jet pipe 33, causing the turbofan 43 to rotate.

[0082] The rotation of the turbofan 43 will drive the shaft to rotate through the universal coupling 42. The rotation of the shaft will drive the cam 41 to rotate. The rotation of the cam 41 will abut against the ball 40, causing the ball 40 to drive the slide rod 38 to move back and forth.

[0083] As the one-way piston disc 36 moves, it draws outside air into the second pipe. When the air passes through the second pipe, it is heated by the heat exchange liquid in the second heat exchange zone. Heating causes the moisture in the air to evaporate and increases the speed of oxygen molecules in the air. After the heated air mixes with methanol, the methanol and oxygen in the air mix more thoroughly, resulting in lower ineffective heat consumption, more complete combustion of methanol, and higher combustion efficiency. The intake speed is greater than the exhaust speed, the air pressure in the exhaust box 32 increases, the exhaust speed increases, and the exhaust is in a jet state, sprayed into the combustion chamber 13.

[0084] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A boiler waste heat recovery and utilization device, comprising a boiler module (1), characterized in that, It also includes a waste heat recovery module (2); The waste heat recovery module (2) is used to recover the heat in the flue gas after fuel combustion in the boiler module (1) and use the recovered heat for fuel combustion. The waste heat recovery module (2) includes a protective shell (15). The protective shell (15) is equipped with a first heat conduction component (21), a second heat conduction component (22), a heat exchange component (25), a gas injection component (16), and a pressurization component (17). The first heat conduction component (21) and the second heat conduction component (22) are wrapped around the outside of the heat exchange component (25). The gas injection component (16) and the pressurization component (17) are both located outside the protective shell (15). The protective shell (15) is divided into a first chamber (23), a second chamber (24) and a third chamber by two partitions (26). The third chamber is divided into a first heat exchange zone and a second heat exchange zone. The first heat conduction component (21) is located in the first heat exchange zone and the second heat conduction component (22) is located in the second heat exchange zone. Both the first heat exchange zone and the second heat exchange zone contain heat exchange fluid. The heat exchange component (25) is used to recover heat from the flue gas, the second heat conduction component (22) is used to recover high heat from the flue gas, and the first heat conduction component (21) is used to utilize the remaining heat in the flue gas after the second heat conduction component (22) has recovered and utilized it. The gas injection assembly (16) is used to inject gas into the boiler module (1) and use the heat recovered by the second heat conduction assembly (22) to heat the gas, thereby improving the fuel combustion efficiency in the boiler module (1); the pressurization assembly (17) uses the waste heat recovered by the first heat conduction assembly (21) to increase the gas pressure of the gas injection assembly (16), so that the fuel can burn more completely.

2. The boiler waste heat recovery and utilization device according to claim 1, characterized in that, The boiler module (1) includes a boiler shell (14), which is divided into a steam outlet chamber (12) and a combustion chamber (13). Multiple heating tubes (10) are fixedly installed in the combustion chamber (13), and a water pump (5) is fixedly installed on the boiler shell (14) for injecting water into the heating tubes (10). One end of the heating tube (10) away from the water pump (5) extends into the steam outlet chamber (12). A steam outlet hole (9) is opened on the steam outlet hole (9), and a steam outlet pipe (3) is fixedly installed on the steam outlet hole (9). A fuel connection pipe (6) is fixedly installed on the boiler shell (14), and multiple fuel injectors (11) are fixedly installed inside the boiler shell (14). Each fuel injector (11) is located in the combustion chamber (13). A gas distribution box is connected to the multiple fuel injectors (11). The fuel connection pipe (6) is connected to the gas distribution box. Two air inlets (7) are fixedly installed on the boiler shell (14), and an air outlet (8) is opened on the boiler shell (14). An air outlet pipe (4) is fixedly installed on the air outlet (8), and the air outlet (8) is connected to the combustion chamber (13).

3. The boiler waste heat recovery and utilization device according to claim 1, characterized in that, The heat exchange assembly (25) includes multiple round holes opened on two partitions (26), and multiple guide tubes (27) that cooperate with the corresponding round holes are fixedly installed on both partitions (26). The guide tubes (27) on the two partitions (26) are aligned, and a heat insulation plate is fixedly installed inside the protective shell (15). The heat insulation plate has multiple holes, and each guide tube (27) is connected to the corresponding hole. The guide tubes (27) on the two partitions (26) do not contact each other.

4. The boiler waste heat recovery and utilization device according to claim 3, characterized in that, Each of the aforementioned guide tubes (27) consists of multiple pipe sections, and a spiral heat-conducting plate (28) is fixedly installed in each pipe section. The spiral directions of the spiral heat-conducting plates (28) in adjacent pipe sections are opposite.

5. The boiler waste heat recovery and utilization device according to claim 1, characterized in that, The second heat-conducting component (22) includes a second heat exchange tube (31), which is composed of multiple spiral-shaped second pipes. Both ends of the second heat exchange tube (31) are fixedly connected to a second connecting box (29). Each of the two second connecting boxes (29) is fixedly connected to a one-way pipe. One of the one-way pipes is exposed, and the other one-way pipe is connected to the gas injection component (16). The first heat-conducting component (21) includes a first heat exchange tube (30), which is composed of multiple spiral-shaped first pipes. Both ends of the first heat exchange tube (30) are fixedly connected to a first connection box (34). One of the first connection boxes (34) is fixedly connected to an air pump (20), and the other first connection box (34) is connected to a pressurizing component (17).

6. The boiler waste heat recovery and utilization device according to claim 5, characterized in that, The air injection assembly (16) includes an air outlet box (32) fixedly installed outside the protective shell (15). The air outlet box (32) is connected to a one-way pipe on the second connecting box (29). The air outlet box (32) has two air holes. An air inlet pipe (19) is fixedly installed on each of the two air holes. The two air inlet pipes (19) are connected to the corresponding air inlet head (7). A one-way valve is fixedly installed on each of the two air inlet pipes (19).

7. The boiler waste heat recovery and utilization device according to claim 6, characterized in that, The pressurization assembly (17) includes a fixed perforated plate (35) fixedly installed inside the air outlet box (32). A slide rod (38) is slidably installed on the fixed perforated plate (35). A one-way piston disc (36) is fixedly installed on one end of the slide rod (38). A return spring (37) is fixedly installed between the one-way piston disc (36) and the fixed perforated plate (35). The end of the slide rod (38) away from the one-way piston disc (36) passes through and extends out of the air outlet box (32). A reciprocating mechanism that cooperates with the slide rod (38) is installed on the air outlet box (32).

8. The boiler waste heat recovery and utilization device according to claim 7, characterized in that, The air outlet box (32) has a through hole, and a sealing sleeve is fixedly installed in the through hole. The slide rod (38) and the sealing sleeve are slidably connected.

9. The boiler waste heat recovery and utilization device according to claim 7, characterized in that, The reciprocating mechanism includes a bracket (39) fixedly mounted on the air outlet box (32), a shaft is rotatably mounted on the bracket (39), a cam (41) is fixedly mounted on the shaft, a ball (40) cooperating with the cam (41) is rotatably mounted on the slide rod (38), a turbofan (43) is rotatably mounted on the air outlet box (32), the central shaft of the turbofan (43) is connected to the shaft via a universal coupling (42), and a drive structure is installed between the first connecting box (34) not connected to the air pump (20) and the turbofan (43).

10. The boiler waste heat recovery and utilization device according to claim 9, characterized in that, The drive structure includes a metal pipe and a jet pipe (33). One end of the metal pipe is connected to the first connecting box (34), and the other end is connected to the jet pipe (33). The turbofan (43) is located at the outlet end of the jet pipe (33). The jet pipe (33) is divided into a straight section and a converging section. The inner diameter of the straight section is three times the inner diameter of the metal pipe, and the inner diameter of the outlet end of the converging section is one-sixth of the inner diameter of the straight section.

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