A high-efficiency waste heat recovery device for waste incineration

Abstract

This utility model discloses a high-efficiency waste heat recovery device for waste incineration, including an incinerator. The furnace wall of the incinerator has a cavity, and a spiral heat exchange tube is installed inside the cavity. An installation pipe is fixedly inserted into the top of the incinerator. The inner cavity of the installation pipe is equipped with a filter assembly for filtering fly ash in the high-temperature flue gas generated by the incinerator. A cap is threaded to the outer circumference of the top of the installation pipe. A connecting hose is inserted into one side of the top of the cap. The end of the connecting hose is sleeved on the input end of the spiral heat exchange tube. By setting up the filter assembly and installing a filter cylinder inside the installation pipe, the fly ash can be initially intercepted before the high-temperature flue gas enters the conveying pipe, preventing fly ash from directly adhering to the inner wall of the pipe. This prevents the inner diameter of the conveying pipe from shrinking and clogging from the source, and reduces the frequency of shutdown for ash cleaning.

Description

Technical Field

[0001] This utility model relates to the technical field of high-efficiency waste heat recovery devices for waste incineration, specifically a high-efficiency waste heat recovery device for waste incineration. Background Technology

[0002] Garbage is solid waste generated in human daily life and production. Due to its large volume, complex and diverse composition, and its polluting, resource-related, and social characteristics, it requires harmless, resource-recovery, volume-reduction, and socialized treatment. If not properly treated, it will pollute the environment, affect environmental sanitation, waste resources, disrupt production and living safety, and undermine social harmony. Garbage disposal aims to quickly remove garbage, treat it harmlessly, and finally make it rationally utilized. The most widely used garbage disposal methods today are sanitary landfill, high-temperature composting, and incineration. The heat generated after incineration is often used for power generation or other uses.

[0003] Currently, Chinese patent CN222824375U discloses a waste incineration waste heat recovery device, including an incinerator. A conveying pipe is fixedly connected to the top of the incinerator, and a heat exchange box is provided on one side of the incinerator. Multiple equidistant horizontal pipes are rotatably connected to the inner wall of the heat exchange box, and multiple sets of equidistant stirring rods are fixedly connected to the outer wall of the horizontal pipes. In use, the waste is burned in the incinerator, generating a large amount of heat and producing high-temperature flue gas. The flue gas enters the horizontal pipes through the conveying pipe, connecting plate, and conduit. The flue gas is diverted through multiple horizontal pipes to improve heat exchange efficiency. The motor is started, and the output shaft of the motor rotates, driving the drive gear to rotate, which in turn drives the driven gear to rotate. The driven gear drives the horizontal pipes and stirring rods to rotate. The stirring rods agitate the water in the heat exchange box, thereby improving heat exchange efficiency. The flue gas after heat exchange enters the filter cartridge through the conduit, connecting plate, and connecting pipe, and large particles in the flue gas are filtered out by the filter plate.

[0004] The aforementioned waste incineration waste heat recovery equipment still has some problems in use. The high-temperature flue gas generated during waste incineration contains a lot of fly ash. If it enters the conveying pipe directly without filtration, it is very likely to adhere to the inner wall of the conveying pipe. Over time, this will cause the inner diameter of the conveying pipe to shrink, eventually leading to complete blockage of the pipe and forcing the machine to be shut down for ash removal. Utility Model Content

[0005] The purpose of this invention is to provide a high-efficiency waste heat recovery device for waste incineration, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A high-efficiency waste heat recovery device for waste incineration includes an incinerator. The furnace wall of the incinerator has a cavity, and a spiral heat exchange tube is installed inside the cavity. An installation pipe is fixedly inserted into the top of the incinerator. The inner cavity of the installation pipe is equipped with a filter assembly for filtering fly ash in the high-temperature flue gas generated by the incinerator. A cap is threaded onto the outer circumference of the top of the installation pipe. A connecting hose is inserted into the top of one side of the cap. The end of the connecting hose is sleeved on the inlet end of the spiral heat exchange tube. A water injection pipe is inserted into the top of the incinerator for injecting water into the cavity. A discharge pipe is connected to the bottom of one side of the incinerator for discharging the water in the cavity to the outside.

[0008] The filter assembly includes a connecting rod rotatably inserted into the middle of the cap. A limiting member is provided at the neck of the connecting rod to prevent the end of the connecting rod from sinking. The end of the connecting rod extends downwards to the lower part of the inner cavity of the mounting tube. A filter cylinder is fixedly connected to the end of the connecting rod located at the lower part of the inner cavity of the mounting tube. The opening of the filter cylinder is downward-facing. A scraping component for scraping fly ash adhering to the inner wall of the filter cylinder is provided at the lower opening of the mounting tube. A handwheel is connected to the top end of the connecting rod via a snap-fit ​​device. Rotating the handwheel causes the filter cylinder to rotate via the connecting rod, thereby allowing the scraping component installed inside the filter cylinder to scrape the inner wall of the filter cylinder. A secondary filter for further filtering high-temperature flue gas is provided at the upper opening of the mounting tube.

[0009] As a preferred technical solution, the secondary filter includes a receiving cylinder disposed in the upper inner cavity of the mounting tube. The outer circular surface of the receiving cylinder is provided with a first external thread. The receiving cylinder is threaded to the inner cavity of the mounting tube through the first external thread. The inner cavity of the receiving cylinder is provided with a filter layer. The bottom of the receiving cylinder is provided with several sets of air vents.

[0010] As a preferred technical solution, the scraping assembly includes a Z-shaped strip disposed at the lower opening of the mounting tube, the top of the Z-shaped strip extending into the inner cavity of the filter cartridge, the two ends of the Z-shaped strip being fixedly connected to the inner walls of both sides of the mounting tube respectively, and scrapers being connected to the top and both sides of the Z-shaped strip by fixing bolts respectively, and the scraping surfaces of the three sets of scrapers respectively contacting the inner walls of the corresponding positions of the filter cartridge.

[0011] As a preferred technical solution, the limiting member includes a second external thread disposed on the neck of the connecting rod, and a nut is threadedly connected to the top of the connecting rod through the second external thread.

[0012] As a preferred technical solution, the snap-fit ​​component includes a snap-fit ​​strip formed inside the handwheel, and a snap-fit ​​groove corresponding to the snap-fit ​​strip is formed on the top of the connecting rod, with the snap-fit ​​strip snapping into the inner cavity of the snap-fit ​​groove.

[0013] As a preferred technical solution, the output end of the spiral heat exchange tube extends through the incinerator to one side, and the output end of the spiral heat exchange tube located outside the incinerator is connected to an exhaust fan, which is used to drive the flue gas to exchange heat through the spiral heat exchange tube.

[0014] As a preferred technical solution, a refractory plate is provided in the upper inner cavity of the incinerator at the position corresponding to the outer circular surface of the mounting pipe. A connecting strip is fixedly connected to the top of one side of the refractory plate, and the top of the connecting strip is fixedly connected to the top inner wall of the incinerator.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model, through the setting of the filter component and the filter cylinder installed inside the installation pipe, can initially intercept fly ash before the high-temperature flue gas enters the conveying pipe, avoid fly ash directly adhering to the inner wall of the pipe, prevent the inner diameter of the conveying pipe from shrinking and clogging from the source, and reduce the frequency of shutdown for cleaning.

[0017] 2. This utility model, through the setting of a secondary filter element, allows the filter layer inside the receiving cylinder to perform secondary filtration of flue gas, further removing fine fly ash and harmful particles, preventing impurities not intercepted by the filter cylinder from entering the heat exchange tube, and extending the overall service life of the equipment. The receiving cylinder is connected to the installation pipe by a thread, and the filter layer can be directly disassembled and replaced. The maintenance operation is simple and does not affect the normal operation of the equipment.

[0018] 3. By setting up the scraping component, when the filter cylinder rotates, three sets of scrapers closely scrape off the fly ash against its inner wall, ensuring that the filter cylinder pores are not blocked, maintaining continuous filtration capacity, and avoiding increased flue gas flow resistance due to ash accumulation in the filter cylinder. At the same time, the two ends of the Z-shaped strip are fixed to the inner wall of the installation pipe, and the scrapers are connected by bolts. The scrapers can be adjusted or replaced according to the wear of the filter cylinder, ensuring long-term stable scraping effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a high-efficiency waste heat recovery device for waste incineration according to the present invention;

[0020] Figure 2 This is a cross-sectional structural schematic diagram of the incinerator and spiral heat exchanger tube of this utility model;

[0021] Figure 3 This is a cross-sectional view of the installation tube of this utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the filter cartridge of this utility model.

[0023] In the picture:

[0024] 100. Incinerator; 101. Water injection pipe; 102. Discharge pipe; 103. Valve; 104. Refractory plate; 105. Connecting strip; 106. Cavity;

[0025] 200. Mounting tube; 201. Cap; 202. Filter cartridge; 203. Receiving cartridge; 204. First external thread; 205. Vent hole; 206. Filter layer; 207. Scraper; 208. Z-shaped strip; 209. Fixing bolt;

[0026] 300. Handwheel; 301. Nut; 302. Second external thread; 303. Connecting rod; 304. Locking strip; 305. Locking groove;

[0027] 400. Connecting hose; 401. Spiral heat exchange tube; 402. Exhaust fan. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figure 1-4 This embodiment provides a high-efficiency waste heat recovery device for waste incineration, including an incinerator 100. The furnace wall of the incinerator 100 has a cavity 106. A spiral heat exchange tube 401 is installed inside the cavity 106. An installation tube 200 is fixedly inserted into the top of the incinerator 100. A filter assembly for filtering fly ash in the high-temperature flue gas generated by the incinerator 100 is installed inside the installation tube 200. A cap 201 is threaded to the outer circumference of the top of the installation tube 200. A connecting hose 400 is inserted into the top of one side of the cap 201. The end of the connecting hose 400 is sleeved on the input end of the spiral heat exchange tube 401. A water injection pipe 101 for injecting water into the cavity 106 is inserted into the top of the incinerator 100. A discharge pipe 102 for discharging water from the cavity 106 to the outside is connected to the bottom of one side of the incinerator 100. A valve 103 is connected to the output end of the discharge pipe 102.

[0030] The filter assembly includes a connecting rod 303 rotatably inserted into the middle of the cap 201. A limiting member is provided at the neck of the connecting rod 303 to prevent its end from sinking. The end of the connecting rod 303 extends downwards to the lower part of the inner cavity of the mounting tube 200. A filter cartridge 202 is fixedly connected to the end of the connecting rod 303 located at the lower part of the inner cavity of the mounting tube 200. The opening of the filter cartridge 202 faces downwards. A scraping component is provided at the lower opening of the mounting tube 200 for scraping fly ash adhering to the inner wall of the filter cartridge 202. The top end of the connecting rod 303 is connected via a snap-fit ​​connector. There is a handwheel 300. By rotating the handwheel 300, the filter cylinder 202 is rotated via the connecting rod 303. This causes the scraping component installed inside the filter cylinder 202 to scrape the inner wall of the filter cylinder 202. The upper opening of the installation pipe 200 is provided with a secondary filter for further filtering of high-temperature flue gas. By setting up the filter assembly and installing the filter cylinder 202 inside the installation pipe 200, the fly ash can be initially intercepted before the high-temperature flue gas enters the conveying pipe, preventing the fly ash from directly adhering to the inner wall of the pipe. This prevents the inner diameter of the conveying pipe from shrinking and clogging from the source, and reduces the frequency of shutdown for cleaning.

[0031] Among them, the filter cartridge 202 can be a 310S stainless steel filter screen cartridge.

[0032] The secondary filter includes a receiving cylinder 203 disposed in the upper inner cavity of the mounting pipe 200. The outer circular surface of the receiving cylinder 203 is provided with a first external thread 204. The receiving cylinder 203 is threaded to the inner cavity of the mounting pipe 200 through the first external thread 204. The inner cavity of the receiving cylinder 203 is provided with a filter layer 206. Several sets of vent holes are opened at the bottom of the receiving cylinder 203. Through the setting of the secondary filter, the filter layer 206 in the receiving cylinder 203 can perform secondary filtration of flue gas, further removing fine fly ash and harmful particles, preventing impurities that are not intercepted by the filter cylinder 202 from entering the heat exchange tube, and extending the overall service life of the equipment. The receiving cylinder 203 is threaded to the mounting pipe 200, and the filter layer 206 can be directly disassembled and replaced. The maintenance operation is simple and does not affect the normal operation of the equipment.

[0033] The filter layer 206 is composed of one or more of the following: filter cotton, activated carbon, glass fiber composite felt, and fiber mesh.

[0034] The scraping assembly includes a Z-shaped strip 208 located at the lower opening of the mounting pipe 200. The top of the Z-shaped strip 208 extends into the inner cavity of the filter cartridge 202. Both ends of the Z-shaped strip 208 are fixedly connected to the inner walls of both sides of the mounting pipe 200. Scrapers 207 are connected to the top and both sides of the Z-shaped strip 208 by fixing bolts 209. The scraping surfaces of the three sets of scrapers 207 respectively contact the inner walls of the corresponding positions of the filter cartridge 202. With the scraping assembly, when the filter cartridge 202 rotates, the three sets of scrapers 207 scrape fly ash close to its inner wall, ensuring that the pores of the filter cartridge 202 are not blocked, maintaining continuous filtration capacity, and avoiding increased flue gas flow resistance due to ash accumulation in the filter cartridge 202. At the same time, the two ends of the Z-shaped strip 208 are fixed to the inner wall of the mounting pipe 200, and the scrapers 207 are connected by bolts. The scrapers 207 can be adjusted or replaced according to the wear of the filter cartridge 202 to ensure long-term stable scraping effect.

[0035] Among them, scraper 207 is preferably made of silicon carbide.

[0036] The limiting component includes a second external thread 302 disposed on the neck of the connecting rod 303. The top of the connecting rod 303 is threadedly connected to a nut 301 through the second external thread 302. With the setting of the limiting component, the nut 301 is fixed to the neck of the connecting rod 303 by the thread, which restricts the axial displacement of the filter cartridge 202 in the mounting tube 200, ensuring that the filter cartridge 202 and the scraping assembly always maintain precise alignment, and avoiding scraping failure due to positional deviation.

[0037] The snap-fit ​​component includes a snap-fit ​​strip 304 fixedly installed inside the handwheel 300. The top of the connecting rod 303 has a snap-fit ​​groove 305 corresponding to the snap-fit ​​strip 304. The snap-fit ​​strip 304 snaps into the inner cavity of the snap-fit ​​groove 305. Through the snap-fit ​​component, the snap-fit ​​structure between the snap-fit ​​strip 304 and the snap-fit ​​groove 305 allows the handwheel 300 to be easily installed or removed, making it convenient to remove the filter cartridge 202 separately during maintenance. At the same time, it ensures that the power is stably transmitted to the filter cartridge 202 when the handwheel 300 is turned, avoiding slippage.

[0038] The spiral heat exchange tube 401 extends through the incinerator 100 to one side. The output end of the spiral heat exchange tube 401 located outside the incinerator 100 is connected to an exhaust fan 402. The exhaust fan 402 is used to drive the flue gas through the spiral heat exchange tube 401 for heat exchange. By setting the exhaust fan 402, the spiral structure extends the flow path of the flue gas in the cavity 106. With the forced convection of the exhaust fan 402, the heat of the flue gas is fully transferred to the water in the cavity 106, improving the waste heat recovery efficiency. Compared with the traditional direct-vent heat exchange structure, it improves the heat utilization rate. At the same time, the exhaust fan 402 can adjust the air volume according to the operating conditions of the incinerator 100 to adapt to the needs of different waste incineration volumes and ensure the stability of the heat exchange process.

[0039] A refractory plate 104 is provided in the upper inner cavity of the incinerator 100, corresponding to the outer circular surface of the mounting tube 200. A connecting strip 105 is fixedly connected to the top of one side of the refractory plate 104. The top of the connecting strip 105 is fixedly connected to the top inner wall of the incinerator 100. Through the setting of the refractory plate 104, the refractory plate 104 isolates the mounting tube 200 from the direct burning of the high temperature flame inside the incinerator 100, avoids the deformation of the mounting tube 200 due to long-term high temperature, and extends the service life of the filter component. The connecting strip 105 fixes the position of the refractory plate 104 to ensure its long-lasting protective effect.

[0040] Among them, the refractory plate 104 is a well-known technical means in the art. Its specific structure and material will not be described in detail here. In addition, in this solution, the diameter of the refractory plate 104 is larger than the diameter of the installation pipe 200.

[0041] Working principle;

[0042] After closing valve 103, cooling water is injected into the furnace wall cavity 106 through water injection pipe 101, and the incinerator 100 is started. The high-temperature flue gas generated by combustion enters the installation pipe 200 from the top of the incinerator 100.

[0043] The high-temperature flue gas entering the installation pipe 200 first undergoes preliminary filtration through the filter cartridge 202 to filter out larger fly ash particles in the high-temperature flue gas. At the same time, the fly ash particles adhere to the inner wall of the filter cartridge 202. After the flue gas has completed preliminary filtration, it passes through the filter cartridge 202 and enters the receiving cylinder 203 through the vent 205. It is further purified by the secondary filter layer 206. The purified flue gas is then drawn by the exhaust fan 402 and enters the spiral heat exchange tube 401 through the connecting hose 400.

[0044] At the same time, the high-temperature flue gas exchanges heat with the water in the cavity 106 when it flows in the spiral heat exchange tube 401, thereby increasing the temperature of the cooling water in the cavity 106.

[0045] Furthermore, by periodically turning the handwheel 300 to rotate the filter cartridge 202, the scraper 207 continuously scrapes away the fly ash on the inner wall of the filter cartridge 202, thereby preventing the filter cartridge 202 from becoming clogged.

[0046] When the filter layer 206 needs to be replaced, disconnect the end of the connecting hose 400 from the spiral heat exchange tube 401, and lift the handwheel 300 upwards to disengage the retaining strip 304 fixed in the middle of the handwheel 300 from the inner cavity of the retaining groove 305. Then, remove the nut 301. Next, use a tool to remove the cap 201 and lift the cap 201 upwards to expose the inner cavity of the mounting tube 200. The operator takes out the filter layer 206 from the receiving cylinder 203 and rotates the receiving cylinder 203 to unscrew it from the inner cavity of the mounting tube 200. At this time, pull the connecting rod 303 upwards to move the filter cylinder 202. Remove the filter cartridge 202 and scraper 207 from the inner cavity of the installation tube 200. If the scraper 207 is found to be worn too much and affecting the scraping effect, remove the fixing bolt 209 to release the restriction on the scraper 207, remove the old scraper 207, replace it with a new scraper 207, and fix it with the fixing bolt 209. Then, screw in the receiving tube 203 and install the new filter layer 206 in the receiving tube 203. Screw the cap 201 on the opening of the installation tube 200 and put the connecting hose 400 connected to the top of the cap 201 onto the inlet end of the spiral heat exchange tube 401.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency waste heat recovery device for waste incineration, characterized in that, The system includes an incinerator (100), the furnace wall of which has a cavity (106). A spiral heat exchange tube (401) is installed inside the cavity (106). An installation tube (200) is fixedly inserted into the top of the incinerator (100). The inner cavity of the installation tube (200) is equipped with a filter assembly for filtering fly ash in the high-temperature flue gas generated by the incinerator (100). The outer circumference of the top of the installation tube (200) is... A cap (201) is threaded on one side of the cap (201) and a connecting hose (400) is inserted into the top of one side. The end of the connecting hose (400) is sleeved on the inlet end of the spiral heat exchange tube (401). A water injection pipe (101) for injecting water into the cavity (106) is inserted into the top of the incinerator (100). A discharge pipe (102) for discharging water from the cavity (106) to the outside is connected to the bottom of one side of the incinerator (100). The filter assembly includes a connecting rod (303) that is rotatably inserted into the middle of the cap (201). A limiting member is provided at the neck of the connecting rod (303) to prevent the end of the connecting rod (303) from sinking. The end of the connecting rod (303) extends downwards to the lower part of the inner cavity of the mounting tube (200). A filter cartridge (202) is fixedly connected to the end of the connecting rod (303) located at the lower part of the inner cavity of the mounting tube (200). The opening of the filter cartridge (202) is downwards, and the lower opening of the mounting tube (200) is... A scraping assembly is provided for scraping off fly ash adhering to the inner wall of the filter cylinder (202). The top end of the connecting rod (303) is connected to a handwheel (300) via a snap-fit. By rotating the handwheel (300), the filter cylinder (202) is rotated via the connecting rod (303), thereby scraping off the inner wall of the filter cylinder (202) by the scraping assembly installed inside the filter cylinder (202). A secondary filter is provided at the upper opening of the mounting tube (200) for further filtering of high-temperature flue gas.

2. The high-efficiency waste heat recovery device for waste incineration according to claim 1, characterized in that: The secondary filter includes a receiving cylinder (203) disposed in the upper inner cavity of the mounting tube (200). The outer circular surface of the receiving cylinder (203) is provided with a first external thread (204). The receiving cylinder (203) is threaded to the inner cavity of the mounting tube (200) through the first external thread (204). The inner cavity of the receiving cylinder (203) is provided with a filter layer (206). The bottom of the receiving cylinder (203) is provided with a plurality of vent holes (205).

3. The high-efficiency waste heat recovery device for waste incineration according to claim 2, characterized in that: The scraping assembly includes a Z-shaped strip (208) disposed at the lower opening of the mounting tube (200). The top of the Z-shaped strip (208) extends into the inner cavity of the filter cartridge (202). The two ends of the Z-shaped strip (208) are respectively fixedly connected to the inner walls of the two sides of the mounting tube (200). The top and two sides of the Z-shaped strip (208) are respectively connected to scrapers (207) by fixing bolts (209). The scraping surfaces of the three sets of scrapers (207) respectively contact the inner walls of the corresponding positions of the filter cartridge (202).

4. The high-efficiency waste heat recovery device for waste incineration according to claim 1, characterized in that: The limiting member includes a second external thread (302) disposed on the neck of the connecting rod (303), and a nut (301) is threadedly connected to the top of the connecting rod (303) through the second external thread (302).

5. The high-efficiency waste heat recovery device for waste incineration according to claim 1, characterized in that: The snap-fit ​​component includes a snap-fit ​​strip (304) that is fixedly installed inside the handwheel (300), and the top of the connecting rod (303) is provided with a snap-fit ​​groove (305) corresponding to the snap-fit ​​strip (304), and the snap-fit ​​strip (304) snaps into the inner cavity of the snap-fit ​​groove (305).

6. The high-efficiency waste heat recovery device for waste incineration according to claim 1, characterized in that: The output end of the spiral heat exchange tube (401) extends through the incinerator (100) to one side. The output end of the spiral heat exchange tube (401) located outside the incinerator (100) is connected to an exhaust fan (402). The exhaust fan (402) is used to drive the flue gas through the spiral heat exchange tube (401) for heat exchange.

7. A high-efficiency waste heat recovery device for waste incineration according to any one of claims 1-6, characterized in that: A refractory plate (104) is provided in the upper inner cavity of the incinerator (100) at the position corresponding to the outer circular surface of the mounting pipe (200). A connecting strip (105) is fixedly connected to the top of one side of the refractory plate (104), and the top of the connecting strip (105) is fixedly connected to the top inner wall of the incinerator (100).

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