Waste heat recovery device for air compression system of waste incineration plant

Abstract

The application provides a waste incineration plant air compression system waste heat recovery device, which comprises a waste gas recovery mechanism, which is installed at the outlet of the waste incineration plant air compression system and is used for collecting heat-carrying compressed gas flow processing mechanism, which is in conductive connection with the waste gas recovery mechanism and is used for separating oil gas from the recovered compressed gas and stabilizing the gas flow rate; a heat energy converter, which is in conductive connection with the gas flow processing mechanism and is used for obtaining heat in the compressed gas and storing; and a heat energy utilization assembly, which is connected with the heat energy converter and is used for heating ammonia water solution or desalted water by using the heat stored in the heat energy converter. The application recovers heat in the compressed air of the waste incineration air compression gas, thereby improving the energy utilization efficiency.

Description

Technical Field

[0001] This invention belongs to the field of waste treatment technology, and in particular relates to a waste heat recovery device for an air compressor system in a waste incineration plant. Background Technology

[0002] Waste incineration is a process in which waste is reduced in volume through appropriate thermal decomposition, combustion, melting and other reactions, and then oxidized at high temperatures to become residue or molten solid matter.

[0003] Waste incineration facilities must be equipped with flue gas treatment facilities to prevent heavy metals, organic pollutants, and other contaminants from being released back into the environment. Recovering the heat generated from waste incineration can achieve the goal of waste resource utilization.

[0004] Waste incineration is an older and traditional method of waste disposal. Because incineration significantly reduces waste volume, saves land, eliminates pathogens, and transforms toxic and harmful substances into harmless ones, it has become one of the main methods of urban waste management. Modern waste incinerators are equipped with advanced flue gas purification systems to reduce air pollution.

[0005] Currently, waste disposal mainly relies on incineration. During incineration, over 70% of the input electrical energy is converted into compression heat when the air compressor system (such as screw air compressors) in the waste incineration plant is running. This heat is typically dissipated directly through air or water cooling (exhaust temperatures reach 80-100°C), resulting in energy waste. Existing waste heat recovery technologies mostly employ a single heat exchange mode (such as heating bath water), with a heat energy utilization rate of less than 30%. Furthermore, high-temperature oil-gas mixtures easily contaminate heat exchange equipment, severely impacting heat utilization efficiency. Summary of the Invention

[0006] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a waste heat recovery device for the air compressor system of a waste incineration plant, which solves the problem of low thermal energy utilization efficiency of the air compressor system in waste incineration in the prior art.

[0007] To achieve the above and other related objectives, the present invention provides a waste heat recovery device for an air compressor system in a waste incineration plant, comprising:

[0008] An exhaust gas recovery device is installed at the outlet of the air compressor system of the waste incineration plant to collect compressed gas carrying heat.

[0009] An airflow treatment mechanism is connected to the waste gas recovery mechanism and is used to separate oil and gas in the recovered compressed gas and stabilize the gas flow rate.

[0010] A heat exchanger, which is connected to the airflow processing mechanism, is used to acquire and store the heat in the compressed gas.

[0011] A heat energy utilization component, connected to the heat energy converter, is used to heat the ammonia solution or demineralized water with the heat stored in the heat energy converter.

[0012] In one embodiment of the present invention, the waste gas recovery mechanism includes an air inlet cylinder connected to the outlet of the air compressor system of the waste incineration plant, and the airflow treatment mechanism includes an oil-gas separator installed inside the air inlet cylinder. The oil-gas separator is used to separate oil and gas in the compressed gas entering the air inlet cylinder. A variable frequency induced draft fan is installed at the gas output end of the oil-gas separator so as to output the gas output by the oil-gas separator at a stable flow rate through the variable frequency induced draft fan.

[0013] In one embodiment of the present invention, the oil-gas separator includes a cyclone box installed inside the air inlet cylinder. A flow divider is installed at the end of the cyclone box that is away from and opposite to the inlet of the air inlet cylinder. A gas-gathering box is installed at the top of the cyclone box, and a liquid-gathering box is installed at the bottom of the cyclone box. A flow divider structure is installed between the top of the flow divider and the gas-gathering box. The flow divider structure is used to divide the gas inside the gas-gathering box. The top of the gas-gathering box is electrically connected to the input end of the variable frequency induced draft fan to input the gas after oil-gas separation into the variable frequency induced draft fan.

[0014] In one embodiment of the present invention, the bottom diameter of the gas-gathering box is smaller than the top diameter. The diversion structure includes multiple partition plates uniformly installed inside the gas-gathering box, forming a partition channel between adjacent partition plates. A flexible sealing plate is installed at the top of the partition channel. Each flexible sealing plate is connected to a corresponding variable frequency induced draft fan via a pipe. A collection hopper is installed at the bottom of the gas-gathering box. Multiple insertion holes are provided at the top of the collection hopper. The bottom end of each partition plate is sequentially inserted into the insertion holes. An exhaust mesh is provided on the surface of the collection hopper between adjacent insertion holes to discharge the gas inside the collection hopper into the corresponding partition channel through the exhaust mesh. An electric telescopic frame is movably installed between the ends of the partition plates away from the insertion holes. The electric telescopic frame is used to adjust the distance between the partition plates.

[0015] In one embodiment of the present invention, a collection channel is provided inside the partition plate, and a channel opening is uniformly provided on the surface of the partition plate, which is connected to the collection channel. A flow limiting plate is installed on the top of the channel opening, and the flow limiting plate is used to limit and block the gas passing through the partition channel. An airflow hole is provided on the upper surface of the flow limiting plate, and the airflow holes on the multiple flow limiting plates on the partition plate are not on a straight line.

[0016] In one embodiment of the present invention, the heat exchanger includes a heat collection tank, which is electrically connected to the output end of the variable frequency induced draft fan. A center seat is installed at the center of the heat collection tank, and a diversion valve is installed inside the center seat. A first heat collector is electrically connected to the top of the diversion valve, and a second heat collector is electrically connected to the bottom of the diversion valve. The diversion valve is used to divert compressed air entering the heat collection tank. When the temperature of the compressed air is greater than a preset temperature, the diversion valve discharges the compressed air into the first heat collector. When the temperature of the compressed air is less than or equal to the preset temperature, the diversion valve discharges the compressed air into the second heat collector. The heat collection efficiency of the first heat collector is greater than that of the second heat collector.

[0017] In one embodiment of the present invention, the first collector includes a first heat exchange cylinder installed at the top of the central seat. Multiple side copper tubes connected to the diversion valve are installed at the bottom of the first heat exchange cylinder. The tops of the multiple side copper tubes are connected via an annular collector to discharge airflow to the outside. Multiple first heat-conducting teeth are connected to the outer wall of the side copper tubes. Placement grooves are formed between adjacent first heat-conducting teeth. The length of the first heat-conducting teeth on the side copper tubes at different positions decreases linearly with increasing height. A central copper tube is also installed at the center of the first heat exchange cylinder. The central copper tube is connected to the side copper tubes. Multiple second heat-conducting teeth located inside the placement grooves are connected to the outer wall of the central copper tube. Both the first and second heat-conducting teeth are wavy in shape. The first heat exchange cylinder is filled with cooling liquid.

[0018] In one embodiment of the present invention, the second heat collector includes a second heat exchange cylinder installed at the bottom of the central seat. The bottom of the second heat exchange cylinder is connected to a conduit, and the end of the conduit is connected to a heat conductor installed in a landfill leachate tank. The heat conductor is used to heat the leachate in the landfill leachate tank. The heat conductor includes a fixed cylinder installed at the end of the conduit. The outer wall of the fixed cylinder is conductively connected to a plurality of heat-conducting pipes extending into the interior of the landfill leachate tank. A central rod is installed at the center of the fixed cylinder. The outer wall of the central rod is connected to a telescopic rod inserted into the interior of the heat-conducting pipes. The end of the telescopic rod is connected to a movable disc. The outer wall of the movable disc is slidably sealed to the inner wall of the heat-conducting pipes to adjust the size of the heating area of ​​the heat-conducting pipes by compressed air entering the fixed cylinder.

[0019] In one embodiment of the present invention, the heat-conducting protrusion surface is wavy, a telescopic sleeve is installed between the conduit and the fixed cylinder, and a hydraulic lifting rod is installed on the outer wall of the fixed cylinder. The hydraulic lifting rod is used to adjust the height of the fixed cylinder inside the landfill leachate tank.

[0020] In one embodiment of the present invention, the heat energy utilization component includes an insertion tube installed on the outer wall of the first heat exchange cylinder, the insertion tube being embedded in an ammonia solution or demineralized water tank to heat the ammonia solution or demineralized water in the ammonia solution or demineralized water tank.

[0021] As described above, the waste heat recovery device for the air compressor system of a waste incineration plant according to the present invention has the following beneficial effects:

[0022] This invention collects the compressed gas carrying heat discharged from the air compressor system of the waste incineration plant through a waste gas recovery mechanism. Then, through an airflow processing mechanism, the recovered compressed gas undergoes oil-gas separation and the gas flow rate is stabilized, thereby reducing the corrosion of the equipment caused by oil and gas during the heat recovery process. Furthermore, the heat energy converter can control the opening and closing of the diversion valve in different directions according to the temperature of the collected hot airflow, so as to select the first or second heat collector for heat conversion and recovery, thereby recovering and utilizing the heat in the compressed air. At the same time, the heat energy utilization component is used to heat the ammonia solution or demineralized water, thereby realizing multiple utilization of heat and improving the heat utilization efficiency. Attached Figure Description

[0023] Figure 1 The diagram shown is an overall structural schematic of the waste heat recovery device of the air compressor system in a waste incineration plant according to the present invention.

[0024] Figure 2 The diagram shows a structural schematic of the partition plate in the waste heat recovery device of the air compressor system of the waste incineration plant according to the present invention.

[0025] Figure 3 The diagram shown is a cross-sectional structural schematic of the first collector of the waste heat recovery device for the air compressor system of a waste incineration plant according to the present invention.

[0026] Figure 4 The diagram shown is a cross-sectional structural schematic of the second collector of the waste heat recovery device for the air compressor system of a waste incineration plant according to the present invention. Detailed Implementation

[0027] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0028] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0029] like Figure 1 As shown, in one embodiment, the present invention provides a waste heat recovery device for an air compressor system in a waste incineration plant, comprising:

[0030] Waste gas recovery unit 1 is installed at the outlet of the air compressor system of the waste incineration plant to collect compressed gas carrying heat;

[0031] The airflow treatment mechanism 2 is connected to the waste gas recovery mechanism 1 and is used to separate oil and gas in the recovered compressed gas and stabilize the gas flow rate.

[0032] The heat converter 3 is connected to the airflow processing mechanism 2 and is used to obtain and store the heat in the compressed gas.

[0033] The heat energy utilization component 4 is connected to the heat energy converter 3 and is used to heat the ammonia solution or demineralized water with the heat stored in the heat energy converter 3.

[0034] In this embodiment, the compressed air generated by the air compressor system of the waste incineration plant is collected at the outlet of the air compressor system by the waste gas recovery mechanism 1. After the compressed air carrying heat is collected, the compressed air is separated into oil and gas and the gas flow rate is stabilized by the airflow treatment mechanism 2 to ensure the stability of subsequent heat collection. Then, the heat in the compressed gas is obtained by the heat energy converter 3 and stored. Then, the heat energy utilization component 4 uses the heat stored in the heat energy converter 3 to heat the ammonia solution or demineralized water, thereby realizing multiple recovery and utilization of the heat in the compressed air, improving the heat utilization efficiency. By using the recovered heat to heat the ammonia solution or demineralized water in the denitrification system of the waste treatment system, the energy consumption in the waste treatment process is effectively reduced.

[0035] In some embodiments, the waste gas recovery mechanism 1 includes an air inlet cylinder 11 connected to the outlet of the air compressor system of the waste incineration plant, and the airflow treatment mechanism 2 includes an oil-gas separator 21 installed inside the air inlet cylinder 11. The oil-gas separator 21 is used to separate the compressed gas entering the air inlet cylinder 11 into oil and gas. A variable frequency induced draft fan 22 is installed at the gas output end of the oil-gas separator 21 so that the gas output from the oil-gas separator is output at a stable flow rate by the variable frequency induced draft fan 22.

[0036] Furthermore, the oil-gas separator 21 includes a cyclone box 211 installed inside the air inlet cylinder 11. A flow divider 212 is installed at the end of the cyclone box 211 that is away from and directly opposite the inlet of the air inlet cylinder 11. A gas-gathering box 213 is installed at the top of the cyclone box 211, and a liquid-gathering box 214 is installed at the bottom of the cyclone box 211. A flow divider structure 5 is installed between the top of the flow divider 212 and the gas-gathering box 213. The flow divider structure 5 is used to divide the gas inside the gas-gathering box 213. The top of the gas-gathering box 213 is connected to the input end of the variable frequency induced draft fan 22 to input the gas after oil-gas separation into the variable frequency induced draft fan 22.

[0037] In this embodiment, after the compressed air carrying heat enters the air inlet cylinder 11, the oil-gas separator 21 is used to separate the compressed air into oil and gas. After the oil-gas separation is completed, the gas carrying heat is output to the variable frequency induced draft fan 22. The variable frequency induced draft fan 22 discharges the compressed gas carrying heat at a stable flow rate, which facilitates subsequent heat recovery.

[0038] Specifically, during the process of compressed gas entering the oil-gas separator 21, it first enters the vortex box 211 inside the air inlet cylinder 11. After entering the vortex box 211, the airflow collides with the opposite flow divider 212. The gas in the compressed gas rises and enters the gas collection box 213, while the liquid droplets in the compressed gas, after colliding with the flow divider 212, enter the liquid collection box 214, thus achieving gas-liquid separation. The flow divider structure 5 installed between the flow divider 212 and the gas collection box 213 divides the airflow inside the gas collection box 213 to improve the subsequent heat recovery effect.

[0039] In some other embodiments, the bottom diameter of the gas-gathering box 213 is smaller than the top diameter. The diversion structure 5 includes multiple partition plates 51 uniformly installed inside the gas-gathering box 213. A partition channel 52 is formed between adjacent partition plates 51. A flexible sealing plate 57 is installed at the top of the partition channel 52. Each flexible sealing plate 57 is connected to a corresponding variable frequency induced draft fan 22 through a pipe. A concentration hopper 53 is installed at the bottom of the gas-gathering box 213. Multiple insertion holes 54 are provided at the top of the concentration hopper 53. The bottom end of each partition plate 51 is sequentially inserted into the insertion hole 54. An exhaust mesh hole 55 is provided on the surface of the concentration hopper 53 between adjacent insertion holes 54 to discharge the gas inside the concentration hopper 53 into the corresponding partition channel 52 through the exhaust mesh hole 55. An electric telescopic frame 56 is movably installed between the ends of the partition plates 51 away from the insertion holes 54. The electric telescopic frame 56 is used to adjust the distance between the partition plates 51.

[0040] In this embodiment, the airflow entering the gas-gathering box 213 is first gathered together by a concentrator 53, and then separated into dividing channels 52 by multiple partition plates 51, facilitating airflow diversion. Specifically, after diversion, the compressed airflow first enters the concentrator 53 at the bottom of the gas-gathering box 213. Since partition plates 51 are installed inside the insertion holes 54 at the top of the concentrator 53, and exhaust mesh holes 55 are installed between adjacent insertion holes 54, the airflow enters the dividing channels 52 formed between the partition plates 51, thus achieving airflow diversion. On the other hand, by movably installing an electric telescopic frame 56 between the ends of adjacent partition plates 51, the distance between adjacent partition plates 51 can be adjusted, thereby adjusting the size of different dividing channels 52 to achieve different diversion effects. This facilitates the subsequent transmission of airflow from the dividing channels 52 of different sizes to the corresponding variable frequency induced draft fan 22, enabling heat recovery from different airflows through diversion and improving heat recovery efficiency.

[0041] It should be noted that the partition plate 51 is movably connected inside the insertion hole 54 by a bearing, ensuring that the partition plate 51 can rotate freely, and facilitating the adjustment of the distance between adjacent partition plates 51 by the electric telescopic frame 56.

[0042] In some other embodiments, such as Figure 2 As shown, the partition plate 51 has a collection channel 511 inside, and the surface of the partition plate 51 is uniformly provided with through-holes 512 that communicate with the collection channel 511. A flow restrictor 513 is installed on the top of the through-hole 512. The flow restrictor 513 is used to restrict and block the gas passing through the partition channel 52. An airflow hole 514 is provided on the upper surface of the flow restrictor 513. The airflow holes 514 on the multiple flow restrictors 513 on the partition plate 51 are not in a straight line, so as to increase the contact time between the flow restrictor 513 and the airflow when the airflow passes through each partition channel 52, thereby improving the blocking effect of the flow restrictor 513 on the oil and gas in the gas. The collection channel 511 is connected to the liquid collection tank 214 through a pipe, so as to discharge the secondary recovered droplets in the airflow back into the liquid collection tank 214 for further secondary oil and gas separation of the separated compressed gas, so as to avoid the oil and gas in the gas from corroding and polluting the equipment.

[0043] In some embodiments, the heat converter 3 includes a heat collection tank 31, which is electrically connected to the output end of the variable frequency induced draft fan 22. A center seat 32 is installed at the center of the heat collection tank 31, and a diversion valve 33 is installed inside the center seat 32. A first heat collector 34 is electrically connected to the top of the diversion valve 33, and a second heat collector 35 is electrically connected to the bottom of the diversion valve 33. The diversion valve 33 is used to divert compressed air entering the heat collection tank 31. When the temperature of the compressed air is greater than a preset temperature, the diversion valve 33 discharges the compressed air into the first heat collector 34. When the temperature of the compressed air is less than or equal to the preset temperature, the diversion valve 33 discharges the compressed air into the second heat collector 35. The heat collection efficiency of the first heat collector 34 is greater than that of the second heat collector 35.

[0044] In this embodiment, after the variable frequency induced draft fan 22 inputs airflow into the heat collector 31 of the heat converter 3, the airflow enters the central seat 32 and is then diverted by the diversion valve 33. When the temperature of the airflow is greater than the preset temperature, the diversion valve 33 discharges the compressed air into the first heat collector 34 for heat recovery. Conversely, when the temperature of the airflow is less than or equal to the preset temperature, the diversion valve 33 inputs the airflow into the second heat collector 35 for heat recovery. This allows for different methods of heat recovery for airflows of different temperatures, thereby further improving the efficiency of heat recovery.

[0045] It should be noted that the preset temperature can be set manually according to actual conditions or based on empirical values. This solution does not impose any particular limitations on this, and will not be elaborated further here. The diversion valve 33 is a temperature-controlled valve based on existing technology, and it is a one-way valve, meaning both valves can only open in one direction simultaneously to ensure the diversion effect.

[0046] In some other embodiments, such as Figure 3As shown, the first collector 34 includes a first heat exchange cylinder 341 installed on the central seat 32. Multiple side copper tubes 342, which are connected to the diversion valve 33, are installed at the bottom of the first heat exchange cylinder 341. The top ends of the multiple side copper tubes 342 are connected by an annular collecting member 347 to discharge airflow to the outside. Multiple first heat-conducting fins 343 are connected to the outer wall of the side copper tubes 342. Adjacent first heat-conducting fins 343 form placement grooves 344, and the tubes 342 are located at different positions. The length of the first heat-conducting fin 343 on the side copper tube 342 decreases linearly with the increase of height, and a central copper tube 345 is also installed at the center of the first heat exchange cylinder 341. The central copper tube 345 is electrically connected to the side copper tube 342. Multiple second heat-conducting fins 346 located inside the placement groove 344 are connected to the outer wall of the central copper tube 345. The first heat-conducting fins 343 and the second heat-conducting fins 346 are both distributed in a wavy shape. The first heat exchange cylinder 341 is filled with cooling liquid.

[0047] In this embodiment, when the first heat exchange cylinder 341 converts the heat of the airflow, the airflow first enters the interior of multiple side copper tubes 342 through the diversion valve 33. Since the side copper tubes 342 are connected to the central copper tube 345, the airflow also enters the interior of the central copper tube 345 and enters the first heat-conducting tooth 343 of the side copper tube 342, the central copper tube 345, and the second heat-conducting tooth 346 on the side, thereby generating convection between the side copper tubes 342 and the central copper tube 345 to improve the heat absorption effect of the hot airflow and the cooling liquid inside the first heat exchange cylinder 341, thereby improving the heat recovery efficiency.

[0048] Specifically, since the gas discharged from the diversion valve 33 is directly discharged into the side copper pipe 342, and then enters the central copper pipe 345 through the side copper pipe 342, the airflow inside the side copper pipe 342 and the central copper pipe 345 has different heat and temperature at the same time. This causes airflow convection between the side copper pipe 342 and the central copper pipe 345, prolonging the residence time of the airflow in the side copper pipe 342 and the central copper pipe 345, thereby improving the heat conduction effect of the side copper pipe 342 and the central copper pipe 345 and improving the heat recovery efficiency.

[0049] In some embodiments, such as Figure 4As shown, the second collector 35 includes a second heat exchange cylinder 351 installed at the bottom of the central seat 32 and connected to the diversion valve 33. A conduit 352 is connected to the bottom of the second heat exchange cylinder 351, and a heat conductor installed in the landfill leachate tank 6 is connected to the end of the conduit 352. The heat conductor is used to heat the leachate in the landfill leachate tank. The heat conductor includes a fixed cylinder 353 installed at the end of the conduit 352. Multiple heat-conducting pipes 354 extending into the interior of the landfill leachate tank 6 are connected to the outer wall of the fixed cylinder 353. A central heat exchanger is installed at the center of the fixed cylinder 353. The central rod 355 has a telescopic rod 356 connected to its outer wall, which is inserted into the heat-conducting pipe 354. The end of the telescopic rod 356 is connected to a movable disc 357. The outer wall of the movable disc 357 is slidably and sealingly fitted with the inner wall of the heat-conducting pipe 354, so as to adjust the size of the heating area of ​​the heat-conducting pipe 354 by the compressed air entering the fixed cylinder 353. The outer wall of the heat-conducting pipe 354 is provided with a plurality of heat-conducting protrusions 358 along the axial direction, so as to transfer the heat of the compressed air to the leachate inside the landfill leachate tank through the heat-conducting protrusions 358 and the heat-conducting pipe 354.

[0050] In this embodiment, after the diversion valve 33 inputs the airflow into the second heat exchange cylinder 351, it enters the heat conductor installed inside the landfill leachate tank 6 through the conduit 352. The heat conductor transfers the heat in the airflow into the landfill leachate in the landfill leachate tank, thereby heating the landfill leachate and improving the fermentation efficiency of the landfill leachate.

[0051] Specifically, the hot airflow first enters the fixed cylinder 353 through the conduit 352, and then enters the outward-extending heat-conducting pipe 354. Due to the impact of the airflow, the airflow will directly enter the heat-conducting pipe 354, thereby pushing the movable plate 357 to slide outward on the inner wall of the heat-conducting pipe 354. This allows more hot airflow to move outward along the movable plate 357, so as to effectively heat the leachate in different areas of the leachate tank and facilitate the fermentation of the leachate.

[0052] Furthermore, an exhaust valve is installed at the top of the fixed cylinder 353 to discharge the gas that has lost heat, facilitating the continuous input of hot air into the fixed cylinder 353 for heat recovery to heat the leachate in the landfill leachate tank and improve fermentation efficiency.

[0053] In some embodiments, the surface of the thermally conductive protrusion 358 is configured to be wavy to improve the heat dissipation effect of the thermally conductive protrusion.

[0054] In some embodiments, the heat energy utilization component 4 includes an insertion tube 41 installed on the outer wall of the first heat exchange cylinder 341. The insertion tube 41 is embedded in the ammonia solution or demineralized water tank 7 to heat the ammonia solution or demineralized water in the ammonia solution or demineralized water tank, so as to realize the recovery and utilization of heat.

[0055] In summary, the waste heat recovery device for the air compressor system of the waste incineration plant described in this invention collects the compressed gas carrying heat discharged from the air compressor system of the waste incineration plant through a waste gas recovery mechanism. Then, through an airflow processing mechanism, the recovered compressed gas undergoes oil-gas separation and the gas flow rate is stabilized, thereby reducing the corrosion of the equipment by oil and gas during the heat recovery process. Furthermore, the heat energy converter can control the opening and closing of the diversion valve in different directions according to the temperature of the collected hot airflow, so as to select either the first or second collector for heat conversion and recovery, thus recovering and utilizing the heat in the compressed air. Simultaneously, the heat energy utilization component uses the converted heat to heat the ammonia solution or demineralized water, thereby achieving multiple uses of heat and improving heat utilization efficiency. Therefore, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0056] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A waste heat recovery device for an air compressor system in a waste incineration plant, characterized in that, include: An exhaust gas recovery device is installed at the outlet of the air compressor system of the waste incineration plant to collect compressed gas carrying heat. An airflow treatment mechanism is connected to the waste gas recovery mechanism and is used to separate oil and gas in the recovered compressed gas and stabilize the gas flow rate. A heat exchanger, which is connected to the airflow processing mechanism, is used to acquire and store the heat in the compressed gas. A heat energy utilization component, connected to the heat energy converter, is used to heat the ammonia solution or demineralized water with the heat stored in the heat energy converter; The waste gas recovery mechanism includes an air inlet cylinder connected to the outlet of the air compressor system of the waste incineration plant. The airflow treatment mechanism includes an oil-gas separator installed inside the air inlet cylinder. The oil-gas separator is used to separate the compressed gas entering the air inlet cylinder into oil and gas. A variable frequency induced draft fan is installed at the gas output end of the oil-gas separator so as to output the gas output by the oil-gas separator at a stable flow rate through the variable frequency induced draft fan. The heat exchanger includes a heat collection tank, which is electrically connected to the output end of the variable frequency induced draft fan. A central seat is installed at the center of the heat collection tank, and a diversion valve is installed inside the central seat. A first heat collector is electrically connected to the top of the diversion valve, and a second heat collector is electrically connected to the bottom of the diversion valve. The diversion valve is used to divert compressed air entering the heat collection tank. When the temperature of the compressed air is greater than a preset temperature, the diversion valve discharges the compressed air into the first heat collector. When the temperature of the compressed air is less than or equal to the preset temperature, the diversion valve discharges the compressed air into the second heat collector. The heat collection efficiency of the first heat collector is greater than that of the second heat collector.

2. The waste heat recovery device for the air compressor system of a waste incineration plant according to claim 1, characterized in that, The oil-gas separator includes a cyclone box installed inside the air inlet cylinder. A flow divider is installed at the end of the cyclone box that is away from and opposite to the inlet of the air inlet cylinder. A gas-gathering box is installed at the top of the cyclone box, and a liquid-gathering box is installed at the bottom of the cyclone box. A flow divider structure is installed between the top of the flow divider and the gas-gathering box. The flow divider structure is used to divide the gas inside the gas-gathering box. The top of the gas-gathering box is connected to the input end of the variable frequency induced draft fan to input the gas after oil-gas separation into the variable frequency induced draft fan.

3. The waste heat recovery device for the air compressor system of a waste incineration plant according to claim 2, characterized in that, The bottom diameter of the gas-gathering box is smaller than its top diameter. The diversion structure includes multiple partition plates evenly installed inside the gas-gathering box, forming a partition channel between adjacent partition plates. A flexible sealing plate is installed at the top of each partition channel. Each flexible sealing plate is connected to a corresponding variable frequency induced draft fan via a pipe. A collection hopper is installed at the bottom of the gas-gathering box, and multiple insertion holes are provided at the top of the collection hopper. The bottom end of each partition plate is sequentially inserted into the insertion holes. The surface of the collection hopper is provided with exhaust mesh holes located between adjacent insertion holes to discharge the gas inside the collection hopper into the corresponding partition channel through the exhaust mesh holes. An electric telescopic frame is movably installed between the ends of the partition plates away from the insertion holes. The electric telescopic frame is used to adjust the distance between the partition plates.

4. The waste heat recovery device for the air compressor system of a waste incineration plant according to claim 3, characterized in that, The partition plate has a collection channel inside, and the surface of the partition plate is uniformly provided with openings that communicate with the collection channel. A flow limiting plate is installed on the top of the opening. The flow limiting plate is used to limit and block the gas passing through the partition channel. An airflow hole is provided on the upper surface of the flow limiting plate. The airflow holes on the multiple flow limiting plates on the partition plate are not in a straight line.

5. The waste heat recovery device for the air compressor system of a waste incineration plant according to claim 1, characterized in that, The first collector includes a first heat exchange cylinder installed on the central seat. Multiple side copper tubes connected to the diversion valve are installed at the top of the first heat exchange cylinder. The tops of the multiple side copper tubes are connected via an annular collector to discharge airflow to the outside. Multiple first heat-conducting teeth are connected to the outer wall of the side copper tubes. Placement grooves are formed between adjacent first heat-conducting teeth. The length of the first heat-conducting teeth on the side copper tubes at different positions decreases linearly with increasing height. A central copper tube is also installed at the center of the first heat exchange cylinder, and is connected to the side copper tubes. Multiple second heat-conducting teeth located inside the placement grooves are connected to the outer wall of the central copper tube. Both the first and second heat-conducting teeth are wavy in shape. The first heat exchange cylinder is filled with cooling liquid.

6. The waste heat recovery device for the air compressor system of a waste incineration plant according to claim 1, characterized in that, The second heat collector includes a second heat exchange cylinder installed at the bottom of the central seat and connected to the diversion valve. The bottom of the second heat exchange cylinder is connected to a conduit, and the end of the conduit is connected to a heat conductor installed in the landfill leachate tank. The heat conductor is used to heat the leachate in the landfill leachate tank. The heat conductor includes a fixed cylinder installed at the end of the conduit. The outer wall of the fixed cylinder is connected to multiple heat-conducting pipes extending into the interior of the landfill leachate tank. A central rod is installed at the center of the fixed cylinder. The outer wall of the central rod is connected to a telescopic rod inserted into the heat-conducting pipes. The end of the telescopic rod is connected to a movable disc. The outer wall of the movable disc is slidably sealed to the inner wall of the heat-conducting pipes to adjust the size of the heating area of ​​the heat-conducting pipes by compressed air entering the fixed cylinder. The outer wall of the heat-conducting pipes is provided with multiple heat-conducting protrusions along the axial direction.

7. The waste heat recovery device for the air compressor system of a waste incineration plant according to claim 6, characterized in that, The heat-conducting protrusion surface is wavy, a telescopic sleeve is installed between the conduit and the fixed cylinder, and a hydraulic lifting rod is installed on the outer wall of the fixed cylinder. The hydraulic lifting rod is used to adjust the height of the fixed cylinder inside the landfill leachate tank.

8. The waste heat recovery device for the air compressor system of a waste incineration plant according to claim 5, characterized in that, The heat energy utilization component includes an insertion tube installed on the outer wall of the first heat exchange cylinder, the insertion tube being embedded in an ammonia solution or demineralized water tank to heat the ammonia solution or demineralized water in the ammonia solution or demineralized water tank.

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