Oil-fired boiler with reduced emission of nitrogen oxides

Abstract

This application relates to a dual-fuel (oil and steam) boiler for reducing nitrogen oxide emissions, belonging to the technical field of dual-fuel boilers. It includes a boiler body, with a feeding and impurity removal mechanism fixedly connected to the outer side of the boiler body, an explosion-proof protection mechanism fixedly connected to the outer side of the boiler body, and a drying assembly fixedly connected to the outer side of the boiler body. A phase-change heat exchange assembly is provided on the inner side of the boiler body, including a combustion chamber located in the middle layer of the boiler body. Vacuum steam chambers are respectively provided in the upper and lower layers inside the boiler body. This application uses a feeding pump to deliver fuel to a filter box. Rotating a control lever drives a cam to move a sliding rod, achieving impurity filtration and quick cleaning of the filter plate. The filtered fuel is then sprayed into the combustion chamber through an atomizing nozzle, thereby achieving efficient interception of particulate impurities in the fuel, preventing impurities from clogging the atomizing nozzle, improving combustion efficiency, reducing nitrogen oxide emissions, and achieving energy saving and emission reduction effects.

Description

Technical Field

[0001] This application relates to the field of dual-fuel (oil and gas) boiler technology, and in particular to a dual-fuel (oil and gas) boiler that reduces nitrogen oxide emissions. Background Technology

[0002] A diesel boiler is a heat energy conversion device that uses diesel fuel to convert chemical energy into heat energy through the combustion of diesel, providing heat for industrial production and residential heating. In cardboard box production, diesel boilers are used to dry cardboard and heat adhesives, ensuring the quality of cardboard box forming and bonding. It mainly consists of a burner, furnace, heat exchanger, and control system, with these components working together to achieve diesel combustion, heat transfer, and operational regulation.

[0003] Before use, check the condition of all components, start the burner to ignite the diesel fuel, and adjust the combustion intensity and heating temperature through the control system. The heat is then transferred to the medium via a heat exchanger. Continuously monitor parameters during operation. After use, turn off the burner, clean and maintain the equipment to ensure safe and stable operation next time.

[0004] In existing technologies, most boilers used for drying cardboard and heating glue use diesel fuel. During combustion, unfiltered diesel fuel can clog atomizing nozzles, resulting in incomplete combustion. This leads to the boilers emitting large amounts of nitrogen oxides in their exhaust gases, which is very environmentally unfriendly and causes serious pollution. Furthermore, boilers that only burn diesel fuel cannot adjust the fuel type according to energy policies and site conditions, resulting in poor adaptability to multi-energy scenarios and limiting the expansion of application scenarios. To address the above problems, a dual-fuel (oil and gas) boiler that reduces nitrogen oxide emissions is proposed. Utility Model Content

[0005] This application aims to provide a dual-fuel boiler that reduces nitrogen oxide emissions, thereby solving the problems of unfiltered diesel fuel clogging nozzles, incomplete combustion leading to high emissions, and poor single-fuel compatibility.

[0006] The technical solution for reducing nitrogen oxide emissions using a dual-fuel (oil and steam) boiler provided in this application is as follows:

[0007] A dual-fuel boiler for reducing nitrogen oxide emissions includes a boiler body. A feeding and impurity removal mechanism is fixedly connected to the outer side of the boiler body, as well as an explosion-proof protection mechanism and a drying assembly. A phase change heat exchange assembly is provided on the inner side of the boiler body. The phase change heat exchange assembly includes a combustion chamber located in the middle layer of the boiler body. Vacuum steam chambers are provided in the upper and lower layers of the boiler body. Multiple steam circulation channels are provided on the inner side of the boiler body, and the upper and lower vacuum steam chambers are connected through the steam circulation channels.

[0008] The feeding and impurity removal mechanism includes a feeding pipe, the outer side of which is fixedly connected to the outer side of the furnace body. A feeding pump is fixedly connected to the outer side of the feeding pipe. A quick-release filter assembly is fixedly connected to the output end of the feeding pump. An atomizing nozzle is fixedly connected to the end of the feeding pipe away from the feeding pump.

[0009] Through the above technical solution: the oil and gas dual-fuel boiler filters impurities through the feeding and impurity removal mechanism to ensure fuel purity and improve combustion efficiency; the phase change heat exchange component realizes efficient heat transfer and recycling; the explosion-proof protection mechanism ensures safe operation; and the drying component meets the needs of carton production, effectively reducing nitrogen oxide emissions and saving energy and protecting the environment.

[0010] As a further description of the above technical solution:

[0011] The quick-release filter assembly includes a filter box, the outer side of which is fixedly connected to the outer side of the feed pump. A cover is provided on the top of the filter box. A locking slide rod is slidably connected to the inner side of the filter box. A locking cone block is fixedly connected to one end of the locking slide rod. A cam is rotatably connected to the outer side of the other end of the locking slide rod. The outer side of the cam contacts the outer side of the filter box. A control lever is fixedly connected to the outer side of the cam.

[0012] Through the above technical solution: in the quick-release filter assembly, rotating the control lever drives the cam, which in turn drives the locking slide to quickly install and remove the cover. The filter box works in conjunction with the impurity removal filter plate to efficiently intercept fuel impurities, facilitate regular cleaning and maintenance, prevent impurities from clogging the nozzle, ensure stable fuel delivery, improve combustion efficiency, and reduce equipment failures and nitrogen oxide emissions.

[0013] As a further description of the above technical solution:

[0014] A locking spring is fitted on the outer side of the locking slide rod. One end of the locking spring is fixedly connected to the outer side of the locking cone block, and the other end of the locking spring is fixedly connected to the inner side of the filter box. The outer side of the locking cone block is slidably connected to the inner side of the box cover. A sealing ring is fixedly connected to the top of the filter box. A filter plate is fixedly connected to the bottom of the box cover. The outer side of the filter plate is slidably connected to the inner side of the filter box. The bottom of the box cover is in contact with the sealing ring.

[0015] The above technical solution utilizes a locking spring to provide a restoring force to the locking cone block, ensuring a secure and sealed tank cover. The sealing ring fits tightly against the tank cover to prevent fuel leakage. The impurity removal filter plate can be quickly disassembled for easy cleaning of impurities, ensuring fuel cleanliness, improving combustion efficiency, reducing equipment maintenance costs, and effectively reducing nitrogen oxide generation.

[0016] As a further description of the above technical solution:

[0017] An oxygen supply assembly is fixedly connected to the outside of the combustion chamber. The oxygen supply assembly includes a combustion oxygen supply main pipe, which is fixedly connected to the outside of the furnace body. An initial combustion oxygen pipe is fixedly connected to the outside of the furnace body. An oxygen supplement pipe is fixedly connected to the outside of the furnace body. An exhaust pipe is fixedly connected to the outside of the furnace body. An exhaust condensate pipe is fixedly connected to the bottom of the exhaust pipe.

[0018] Through the above technical solution, the oxygen supply component achieves precise oxygen distribution in stages through the combustion oxygen supply main pipe, the initial combustion ignition oxygen pipe and the combustion supplement oxygen pipe. In the early stage of combustion, a high concentration of oxygen assists combustion, and in the middle stage, an appropriate amount of oxygen is supplemented to promote complete combustion, effectively inhibiting the generation of nitrogen oxides. The flue pipe and the condensate pipe work together to discharge flue gas and collect condensate, reducing heat loss and equipment corrosion, and improving energy efficiency and environmental protection.

[0019] As a further description of the above technical solution:

[0020] The drying assembly includes a drying chamber, the outer side of which is fixedly connected to the outer side of the furnace body. A frame is fixedly connected to the bottom of the drying chamber, and an insulation door is slidably connected to the outer side of the frame.

[0021] The above technical solution utilizes the heat from the oven to dry the cartons. The frame ensures the stability of the cartons, and the sliding insulated door can be opened and closed flexibly, effectively locking in the heat inside the cartons, improving drying efficiency, reducing energy consumption, and facilitating the placement and removal of cartons by operators. This optimizes the carton production process and achieves efficient recycling of thermal energy.

[0022] As a further description of the above technical solution:

[0023] A circulation pipeline assembly is fixedly connected to the inner side of the furnace body. The circulation pipeline assembly includes a heat absorption circulation pipe. The outer sides of multiple heat absorption circulation pipes are fixedly connected to the inner side of the vacuum steam chamber. Multiple heat dissipation drying pipes are fixedly connected to the inner side of the drying box. A preheating circulation pipe is sleeved on the outer side of the feed pipe. The heat absorption circulation pipe and the heat dissipation drying pipe are connected. Both ends of the preheating circulation pipe are fixedly connected to the inner side of the vacuum steam chamber.

[0024] Through the above technical solution: in the circulation pipeline assembly, the heat absorption circulation pipe absorbs heat from the vacuum steam chamber and uses it for drying the cardboard box through the heat dissipation drying pipe. At the same time, the preheating circulation pipe preheats the fuel, thereby realizing the cascade utilization of heat, improving energy utilization efficiency, reducing heat loss, reducing the difficulty of fuel atomization, promoting efficient combustion, and taking into account both energy saving and emission reduction.

[0025] As a further description of the above technical solution:

[0026] The explosion-proof protection mechanism includes a pressure relief main pipe, a rupture membrane fixedly connected to the inner side of the pressure relief main pipe, and a pressure relief assembly fixedly connected to the outer side of the pressure relief main pipe. The pressure relief assembly includes a fixing frame, the outer side of the fixing frame fixedly connected to the inner side of the pressure relief main pipe, a return spring fixedly connected to the outer side of the fixing frame, and a pressure relief plate fixedly connected to the end of the return spring away from the fixing frame. The pressure relief plate is located at the inlet of the pressure relief main pipe.

[0027] The above technical solution works as follows: when the internal pressure of the boiler exceeds the threshold, the rupture membrane breaks, and the high pressure pushes the pressure relief plate to overcome the spring force and open to release pressure. After the pressure is reduced, the reset spring causes the pressure relief plate to automatically reset and seal. This can quickly release excessive pressure, avoid boiler damage, ensure equipment operation safety, reduce accident risks, and extend the service life of the boiler.

[0028] As a further description of the above technical solution:

[0029] A pressure relief branch pipe is fixedly connected to the outer side of the main pressure relief pipe, and a rotating shaft is fixedly connected to the inner side of the main pressure relief pipe. A diversion rod is rotatably connected to the outer side of the rotating shaft of the main pressure relief pipe. A branch pipe plug is fixedly connected to one end of the diversion rod, and the other end of the diversion rod is in contact with the pressure relief plate.

[0030] The above technical solution involves connecting the main pressure relief pipe to an external pressure relief branch pipe. When the pressure relief plate moves, it drives the flow divider to rotate, causing the branch pipe plug to open and divide the flow. This disperses excessive pressure, avoids excessive load on the main pressure relief pipe, improves pressure relief efficiency and stability, ensures boiler safety, reduces equipment damage caused by sudden pressure increases, and extends service life.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. In this utility model, fuel is transported to the filter box via a feed pipe by a feed pump. The operator rotates the control lever to drive the cam to rotate, causing the locking slide bar to move axially. The locking cone block disengages from the box cover slot, allowing for quick removal of the box cover. The impurity removal filter plate at the bottom of the box cover filters impurities from the fuel. The filtered fuel is then sprayed into the combustion chamber through an atomizing nozzle. This achieves efficient interception of particulate impurities in the fuel, preventing impurities from clogging the atomizing nozzle, ensuring stable fuel delivery and complete combustion, and improving combustion efficiency. At the same time, the quick-release structure facilitates regular cleaning and maintenance, reduces the risk of equipment failure, and helps reduce nitrogen oxide emissions.

[0033] 2. In this utility model, when the pressure inside the boiler exceeds the set value, the rupture membrane breaks, and the pressure pushes the pressure relief plate to move against the tension of the reset spring, driving the diverter rod to rotate, causing the branch pipe plug to open the pressure relief branch pipe, thereby realizing pressure release. Thus, when the boiler pressure rises abnormally, the pressure can be quickly dispersed and released, reducing the load on the main pressure relief pipe, preventing the boiler from being damaged due to overpressure. Furthermore, the reset spring and the pressure relief plate work together to ensure that the seal is automatically reset after the pressure returns to normal, effectively reducing the risk of safety accidents, ensuring stable operation of the equipment, extending the service life of the boiler, and providing a reliable guarantee for safe production. Attached Figure Description

[0034] Figure 1 This is a three-dimensional schematic diagram of a dual-fuel (oil and gas) boiler for reducing nitrogen oxide emissions proposed in this utility model.

[0035] Figure 2 This is a schematic diagram of the heat absorption circulation tube of a dual-fuel (oil and gas) boiler that reduces nitrogen oxide emissions, as proposed in this utility model.

[0036] Figure 3 This is a schematic diagram of the structure of an atomizing nozzle for a dual-fuel (oil and gas) boiler that reduces nitrogen oxide emissions, as proposed in this utility model.

[0037] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0038] Figure 5 This is a schematic diagram of the structure of the rupture membrane of a dual-fuel (oil and gas) boiler that reduces nitrogen oxide emissions, as proposed in this utility model.

[0039] Figure 6 for Figure 5 Enlarged view of section B in the middle.

[0040] Explanation of reference numerals in the attached drawings: 1. Furnace body; 2. Feeding and impurity removal mechanism; 21. Feed pipe; 22. Feed pump; 23. Quick-release filter assembly; 231. Filter box; 232. Box cover; 233. Engaging slide bar; 234. Engaging cone block; 235. Cam; 236. Engaging spring; 237. Control lever; 24. Impurity removal filter plate; 25. Sealing ring; 26. Atomizing nozzle; 3. Phase change heat exchange assembly; 31. Vacuum steam chamber; 32. Combustion chamber; 33. Steam circulation channel; 4. Explosion-proof protection mechanism; 41. Pressure relief main pipe; 42. Bursting membrane; 43. Pressure relief assembly; 431. Fixing frame; 432. Return spring; 433. Pressure relief plate; 434. Diverter rod; 435. Pipe plug; 44. Pressure relief branch pipe; 5. Smoke exhaust pipe; 6. Smoke exhaust condensate pipe; 7. Drying assembly; 71. Frame; 72. Drying oven; 73. Insulated door; 8. Oxygen supply assembly; 81. Combustion oxygen supply main pipe; 82. Initial combustion ignition oxygen pipe; 83. In-combustion oxygen replenishment pipe; 9. Circulation pipeline assembly; 91. Heat absorption circulation pipe; 92. Heat dissipation drying pipe; 93. Preheating circulation pipe. Detailed Implementation

[0041] The following combination Figures 1-6 This application will be described in further detail.

[0042] Example: A dual-fuel (oil and gas) boiler for reducing nitrogen oxide emissions, referring to... Figures 1 to 3 The boiler includes a furnace body 1, which is the main structure of the entire boiler and has good heat insulation and heat preservation performance. A feeding and impurity removal mechanism 2 is fixedly connected to the outside of the furnace body 1. An explosion-proof protection mechanism 4 is also fixedly connected to the outside of the furnace body 1. A drying assembly 7 is fixedly connected to the outside of the furnace body 1. A phase change heat exchange assembly 3 is located on the inside of the furnace body 1. The phase change heat exchange assembly 3 includes a combustion chamber 32, which is the core area for fuel combustion and can withstand the scouring and erosion of high-temperature flames. Internal ribs, swirl vanes, and other turbulence structures enhance the air-fuel interaction. The mixing effect further improves combustion efficiency and reduces the generation of nitrogen oxides. The combustion chamber 32 is located in the middle layer of the furnace body 1. Vacuum steam chambers 31 are respectively opened in the upper and lower layers of the furnace body 1. The vacuum steam chambers 31 adopt vacuum insulation technology to reduce heat loss and accurately transfer heat to the heat absorption circulation pipe 91. Multiple steam circulation channels 33 are opened on the inner side of the furnace body 1. The steam circulation channels 33 are equipped with guide plates to guide the steam to flow in an orderly manner in the circulation channels. The upper and lower vacuum steam chambers 31 are connected through the steam circulation channels 33.

[0043] The feeding and impurity removal mechanism 2 includes a feeding pipe 21, which enables fuel to be stably and smoothly delivered into the furnace body 1. The outer side of the feeding pipe 21 is fixedly connected to the outer side of the furnace body 1. A feeding pump 22 is fixedly connected to the outer side of the feeding pipe 21. The feeding pump 22 can precisely adjust the fuel delivery amount according to the actual operating load of the boiler to achieve precise fuel supply. A quick-release filter assembly 23 is fixedly connected to the output end of the feeding pump 22. An atomizing nozzle 26 is fixedly connected to the end of the feeding pipe 21 away from the feeding pump 22. The atomizing nozzle 26 fully mixes fuel oil or gas with air and sprays it into the combustion chamber 32 inside the furnace body 1 in a mist form to promote complete combustion and reduce the generation of nitrogen oxides.

[0044] Specifically, fuel is delivered by feed pump 22 through feed pipe 21, first passes through quick-release filter assembly 23 to remove impurities, and then is sprayed into combustion chamber 32 in a mist form through atomizing nozzle 26. The ribs and swirl vanes of combustion chamber 32 enhance the mixing of air and fuel, and the generated steam flows orderly between the upper and lower vacuum steam chambers 31 through steam circulation channel 33 with guide plate.

[0045] An oxygen supply assembly 8 is fixedly connected to the outside of the combustion chamber 32. The oxygen supply assembly 8 includes a combustion oxygen supply main pipe 81, which provides the main air source for fuel combustion. Its flow rate is adjustable to facilitate the achievement of the optimal air-fuel ratio and reduce nitrogen oxide emissions. The combustion oxygen supply main pipe 81 is fixedly connected to the outside of the furnace body 1. An initial combustion oxygen pipe 82 is fixedly connected to the outside of the furnace body 1. The initial combustion oxygen pipe 82 provides a high concentration of oxygen in the early stage of fuel ignition to help the fuel ignite quickly and stably. An oxygen supplement pipe 83 is fixedly connected to the outside of the furnace body 1. During the fuel combustion process, the oxygen supplement pipe 83 supplements an appropriate amount of oxygen in a timely manner according to the different needs of the combustion stage to promote the complete combustion of fuel and reduce the generation of incomplete combustion products and nitrogen oxides. An exhaust pipe 5 is fixedly connected to the outside of the furnace body 1. The exhaust pipe 5 is used to discharge the flue gas generated by the boiler combustion. An exhaust condensate pipe 6 is fixedly connected to the bottom of the exhaust pipe 5. The exhaust condensate pipe 6 is used to collect and discharge the condensate generated during the exhaust process.

[0046] Specifically, during combustion, the combustion oxygen supply main pipe 81 supplies the main air for fuel combustion, and the flow rate can be adjusted as needed. In the initial stage of ignition, the initial ignition oxygen pipe 82 provides high-concentration oxygen to aid combustion. During the combustion process, the combustion oxygen supplement pipe 83 supplements an appropriate amount of oxygen according to different stages. The flue gas generated during combustion is discharged through the exhaust pipe 5, and the condensate generated during this period is collected and discharged by the exhaust condensate pipe 6.

[0047] The drying assembly 7 includes a drying chamber 72, which is used to heat the adhesive to achieve a suitable viscosity so as to better bond the cardboard parts together and assist in the curing of ink. The outside of the drying chamber 72 is fixedly connected to the outside of the furnace body 1, and the bottom of the drying chamber 72 is fixedly connected to a frame 71, which provides support and fixation for the drying chamber 72. A heat preservation door 73 is slidably connected to the outside of the frame 71. The closing of the heat preservation door 73 can ensure the heat preservation performance of the drying chamber 72 and improve the drying efficiency.

[0048] Specifically, during drying, heat is transferred from the furnace body 1 to the drying chamber 72, heating the adhesive inside the chamber to achieve the appropriate viscosity and assisting in ink curing. The operator controls the sealing state of the drying chamber 72 by opening and closing the heat preservation door 73 on the outside of the frame 71, ensuring heat preservation performance and improving the drying efficiency of bonding and curing paperboard components.

[0049] A circulation pipeline assembly 9 is fixedly connected to the inner side of the furnace body 1. The circulation pipeline assembly 9 includes a heat absorption circulation pipe 91. The heat absorption circulation pipe 91 is serpentine, which increases the contact area with steam and improves the heat absorption efficiency. It can fully absorb the heat of steam and transfer the heat to the required parts. The outer sides of multiple heat absorption circulation pipes 91 are fixedly connected to the inner side of the vacuum steam chamber 31. Multiple heat dissipation drying pipes 92 are fixedly connected to the inner side of the drying chamber 72. The heat dissipation drying pipes 92 transfer the absorbed heat to the drying chamber 72 to provide a heat source for the drying process in the carton production process. A preheating circulation pipe 93 is sleeved on the outer side of the feed pipe 21. The preheating circulation pipe 93 uses the waste heat inside the boiler to preheat the incoming fuel, reduce the viscosity of the fuel, make it easier to atomize and burn, further improve the combustion efficiency, and reduce the generation of nitrogen oxides. The heat absorption circulation pipe 91 and the heat dissipation drying pipe 92 are connected. The two ends of the preheating circulation pipe 93 are fixedly connected to the inner side of the vacuum steam chamber 31.

[0050] Specifically, inside the furnace body 1, the serpentine heat absorption circulation pipe 91 absorbs steam heat in the vacuum steam chamber 31. Part of the heat is sent to the drying box 72 through the heat dissipation drying pipe 92 for drying, and the other part is preheated through the preheating circulation pipe 93 sleeved outside the feed pipe 21 to improve the atomization combustion effect.

[0051] Reference Figures 2 to 4The quick-release filter assembly 23 includes a filter box 231, which filters impurities mixed in the fuel and facilitates the sedimentation and cleaning of these impurities. The outer side of the filter box 231 is fixedly connected to the outer side of the feed pump 22. A cover 232 is provided on the top of the filter box 231, which seals the filter box 231. A locking slide rod 233 is slidably connected to the inner side of the filter box 231. The movement of the locking slide rod 233 enables the cover 232 to be quickly locked and unlocked, facilitating quick disassembly, cleaning, and installation of the filter plate. A locking cone block is fixedly connected to one end of the locking slide rod 233. 234, which can be tightly embedded in the slot of the cover 232 under the drive of the locking slide rod 233, providing a reliable sealing and fixing effect. The other end of the locking slide rod 233 is rotatably connected to a cam 235. The cam 235 cooperates with the locking slide rod 233 to realize the axial movement of the locking slide rod 233. The operator rotates the control rod 237 to drive the cam 235 to rotate, thereby pushing or pulling the locking slide rod 233. The outer side of the cam 235 contacts the outer side of the filter box 231. The control rod 237 is fixedly connected to the outer side of the cam 235.

[0052] Specifically, during use, the fuel passes through the filter box 231 and is filtered by the impurity removal filter plate 24. When cleaning is required, the control lever 237 is rotated to drive the cam 235 to rotate, causing the locking slide bar 233 to move axially, and the locking cone block 234 to disengage from the slot of the box cover 232, so that the box cover 232 can be quickly removed to clean the inside of the filter box 231.

[0053] A locking spring 236 is sleeved on the outside of the locking slide rod 233. The locking spring 236 provides the elastic force for the locking slide rod 233 to return to its original position. One end of the locking spring 236 is fixedly connected to the outside of the locking cone block 234, and the other end of the locking spring 236 is fixedly connected to the inside of the filter box 231. The outside of the locking cone block 234 is slidably connected to the inside of the box cover 232. A sealing ring 25 is fixedly connected to the top of the filter box 231. The sealing ring 25 has good sealing performance. When the box cover 232 is installed in place, the sealing ring 25 is squeezed to form a reliable seal to prevent fuel leakage. A filter plate 24 is fixedly connected to the bottom of the box cover 232. The filter plate 24 can effectively filter out particulate impurities such as rust and sand. It is detachable for regular cleaning and replacement to ensure the filtration effect. The outside of the filter plate 24 is slidably connected to the inside of the filter box 231. The bottom of the box cover 232 is in contact with the sealing ring 25.

[0054] Specifically, when installing the cover 232, the engaging cone block 234 presses against the engaging spring 236 until the spring returns to its original position at the corresponding slot. The cone block then embeds into the slot to fix the cover 232. At this time, the sealing ring 25 is sealed under pressure. The impurity removal filter plate 24 is inserted into the filter box 231 along with the cover 232 to filter particulate impurities such as rust and mud in the fuel. It can be disassembled for cleaning and maintenance.

[0055] Reference Figure 1 , Figure 5 and Figure 6 The explosion-proof protection mechanism 4 includes a pressure relief main pipe 41. The inner wall of the pressure relief main pipe 41 is smooth, which can reduce the reflection and resistance of pressure waves in the pipe and ensure that the pressure can be released quickly and effectively. A rupture diaphragm 42 is fixedly connected to the inner side of the pressure relief main pipe 41. The rupture diaphragm 42 has a precise rupture pressure setting value. When the internal pressure of the boiler exceeds the allowable value, the rupture diaphragm 42 ruptures quickly, releasing the pressure and reducing damage to the boiler. A pressure relief assembly 43 is fixedly connected to the outer side of the pressure relief main pipe 41. The pressure relief assembly 43 includes a fixing frame 431. The fixing frame 431 can withstand the impact force generated by the pressure relief plate 433 under pressure, ensuring the stability of the entire pressure relief assembly 43. The outer side of the 1 is fixedly connected to the inner side of the pressure relief main pipe 41. The outer side of the fixing frame 431 is fixedly connected to the return spring 432. Under normal operation, the return spring 432 presses the pressure relief plate 433 tightly against the pipe opening of the pressure relief main pipe 41 to achieve a sealing effect. When the internal pressure of the boiler rises and exceeds the tension of the return spring 432, the pressure relief plate 433 is pushed open to relieve pressure. The end of the return spring 432 away from the fixing frame 431 is fixedly connected to the pressure relief plate 433. The pressure relief plate 433 can ensure the sealing performance during normal operation and can withstand high pressure impact without permanent deformation or cracking. The pressure relief plate 433 is set at the pipe opening of the pressure relief main pipe 41.

[0056] Specifically, during normal operation, the reset spring 432 presses the pressure relief plate 433 against the opening of the pressure relief main pipe 41 for sealing. When the pressure inside the boiler exceeds the allowable value, the rupture membrane 42 ruptures, and the pressure pushes the pressure relief plate 433 to overcome the spring tension and open the pressure relief. The pressure relief main pipe 41 with its smooth inner wall quickly releases the pressure. After the pressure drops, the spring resets the pressure relief plate 433.

[0057] A pressure relief branch pipe 44 is fixedly connected to the outside of the pressure relief main pipe 41. When the pressure of the main pipe is too high, part of the pressure is released through the pressure relief branch pipe 44, reducing the pressure of the pressure relief main pipe 41. A rotating shaft is fixedly connected to the inside of the pressure relief branch pipe 44. A diversion rod 434 is rotatably connected to the outside of the rotating shaft of the pressure relief main pipe 41. When the pressure relief plate 433 moves, it drives the diversion rod 434 to rotate, causing the diversion plug 435 to open or close the pressure relief branch pipe 44. A diversion plug 435 is fixedly connected to one end of the diversion rod 434. The diversion plug 435 is used to control the opening and closing of the pressure relief branch pipe 44 and adjust the diversion pressure and flow rate. The other end of the diversion rod 434 is in contact with the pressure relief plate 433.

[0058] Specifically, when the pressure in the main pressure relief pipe 41 is too high, the pressure relief plate 433 is pushed open to relieve pressure, and at the same time, it drives the diversion rod 434 to rotate around the shaft, causing the branch pipe plug 435 to open the pressure relief branch pipe 44. Part of the pressure is released through the branch pipe, reducing the pressure in the main pipeline. When the pressure drops, the pressure relief plate 433 returns to its original position, and the diversion rod 434 drives the branch pipe plug 435 to close the branch pipe and stop diversion.

[0059] The implementation principle of this application embodiment is as follows: When in use, fuel is transported through the feed pipe 21 under the action of the feed pump 22, and first enters the filter box 231. The impurity removal filter plate 24 intercepts particulate impurities such as rust and mud. Then, it is fully mixed with air through the atomizing nozzle 26 and sprayed into the combustion chamber 32 in a mist form. At the same time, the combustion oxygen supply main pipe 81, the initial combustion ignition oxygen pipe 82, and the combustion oxygen supplementation pipe 83 supply air as needed to achieve staged combustion. Initial oxygen-deficient combustion inhibits the generation of nitrogen oxides, and the supplementation of air in the later stage ensures complete combustion.

[0060] After a long period of filtration, if it is necessary to clean the filter plate, rotate the control lever 237 to drive the cam 235, so that the locking slide bar 233 moves against the elastic force of the locking spring 236, and the locking cone block 234 disengages from the slot of the cover 232, so that the cover 232 can be quickly removed to clean the impurity removal filter plate 24.

[0061] If the boiler is damaged and the internal pressure is too high, the rupture membrane 42 will rupture first. The pressure relief plate 433 will move under the pressure to overcome the tension of the reset spring 432. Part of the pressure will be diverted through the diversion rod 434 to open the branch pipe plug 435 and then diverted by the pressure relief branch pipe 44 to achieve pressure relief and buffering.

[0062] Steam generated by internal combustion circulates between the vacuum steam chamber 31 and the steam circulation channel 33. The heat absorption circulation pipe 91 absorbs the heat of the steam. Part of it is transferred to the drying chamber 72 through the heat dissipation drying pipe 92 to provide a drying heat source for heating adhesives and curing inks in carton production. The other part is preheated by the preheating circulation pipe 93 to preheat the fuel in the feed pipe 21, so as to achieve efficient utilization of heat.

[0063] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A dual-fuel boiler for reducing nitrogen oxide emissions, comprising a boiler body (1), characterized in that: A feeding and impurity removal mechanism (2) is fixedly connected to the outside of the furnace body (1), an explosion-proof protection mechanism (4) is fixedly connected to the outside of the furnace body (1), a drying assembly (7) is fixedly connected to the outside of the furnace body (1), a phase change heat exchange assembly (3) is provided on the inside of the furnace body (1), the phase change heat exchange assembly (3) includes a combustion chamber (32), the combustion chamber (32) is located in the middle layer of the furnace body (1), a vacuum steam chamber (31) is provided in the upper and lower layers of the furnace body (1), and multiple steam circulation channels (33) are provided on the inside of the furnace body (1), the upper and lower vacuum steam chambers (31) are connected through the steam circulation channels (33); The feeding and impurity removal mechanism (2) includes a feeding pipe (21), the outer side of the feeding pipe (21) is fixedly connected to the outer side of the furnace body (1), the outer side of the feeding pipe (21) is fixedly connected to a feeding pump (22), the output end of the feeding pump (22) is fixedly connected to a quick-release filter assembly (23), and the end of the feeding pipe (21) away from the feeding pump (22) is fixedly connected to an atomizing nozzle (26).

2. The dual-fuel (oil and gas) boiler for reducing nitrogen oxide emissions according to claim 1, characterized in that: The quick-release filter assembly (23) includes a filter box (231), the outer side of which is fixedly connected to the outer side of the feed pump (22). A box cover (232) is provided on the top of the filter box (231). A locking slide rod (233) is slidably connected to the inner side of the filter box (231). A locking cone block (234) is fixedly connected to one end of the locking slide rod (233). A cam (235) is rotatably connected to the outer side of the other end of the locking slide rod (233). The outer side of the cam (235) contacts the outer side of the filter box (231). A control lever (237) is fixedly connected to the outer side of the cam (235).

3. A dual-fuel (oil and gas) boiler for reducing nitrogen oxide emissions according to claim 2, characterized in that: A locking spring (236) is sleeved on the outside of the locking slide rod (233). One end of the locking spring (236) is fixedly connected to the outside of the locking cone block (234), and the other end of the locking spring (236) is fixedly connected to the inside of the filter box (231). The outside of the locking cone block (234) is slidably connected to the inside of the box cover (232). A sealing ring (25) is fixedly connected to the top of the filter box (231), and a cleaning filter plate (24) is fixedly connected to the bottom of the box cover (232). The outside of the cleaning filter plate (24) is slidably connected to the inside of the filter box (231), and the bottom of the box cover (232) is in contact with the sealing ring (25).

4. A dual-fuel (oil and gas) boiler for reducing nitrogen oxide emissions according to claim 1, characterized in that: An oxygen supply assembly (8) is fixedly connected to the outside of the combustion chamber (32). The oxygen supply assembly (8) includes a combustion oxygen supply main pipe (81). The outside of the combustion oxygen supply main pipe (81) is fixedly connected to the outside of the furnace body (1). An initial combustion ignition oxygen pipe (82) is fixedly connected to the outside of the furnace body (1). An oxygen supplement pipe (83) is fixedly connected to the outside of the furnace body (1). An exhaust pipe (5) is fixedly connected to the outside of the furnace body (1). An exhaust condensate pipe (6) is fixedly connected to the bottom of the exhaust pipe (5).

5. A dual-fuel (oil and gas) boiler for reducing nitrogen oxide emissions according to claim 1, characterized in that: The drying assembly (7) includes a drying box (72), the outside of which is fixedly connected to the outside of the furnace body (1), and a frame (71) is fixedly connected to the bottom of the drying box (72). A heat preservation door (73) is slidably connected to the outside of the frame (71).

6. A dual-fuel (oil and steam) boiler for reducing nitrogen oxide emissions according to claim 5, characterized in that: A circulation pipeline assembly (9) is fixedly connected to the inner side of the furnace body (1). The circulation pipeline assembly (9) includes a heat absorption circulation pipe (91). The outer sides of multiple heat absorption circulation pipes (91) are fixedly connected to the inner side of the vacuum steam chamber (31). Multiple heat dissipation drying pipes (92) are fixedly connected to the inner side of the drying box (72). A preheating circulation pipe (93) is sleeved on the outer side of the feed pipe (21). The heat absorption circulation pipe (91) and the heat dissipation drying pipe (92) are connected. The two ends of the preheating circulation pipe (93) are fixedly connected to the inner side of the vacuum steam chamber (31).

7. A dual-fuel (oil and gas) boiler for reducing nitrogen oxide emissions according to claim 1, characterized in that: The explosion-proof protection mechanism (4) includes a pressure relief main pipe (41), a rupture membrane (42) is fixedly connected to the inner side of the pressure relief main pipe (41), and a pressure relief assembly (43) is fixedly connected to the outer side of the pressure relief main pipe (41). The pressure relief assembly (43) includes a fixing frame (431), the outer side of the fixing frame (431) is fixedly connected to the inner side of the pressure relief main pipe (41), a return spring (432) is fixedly connected to the outer side of the fixing frame (431), and a pressure relief plate (433) is fixedly connected to the end of the return spring (432) away from the fixing frame (431). The pressure relief plate (433) is located at the inlet of the pressure relief main pipe (41).

8. A dual-fuel (oil and gas) boiler for reducing nitrogen oxide emissions according to claim 7, characterized in that: The pressure relief main pipe (41) is fixedly connected to the outer side of the pressure relief branch pipe (44), and a rotating shaft is fixedly connected to the inner side of the pressure relief branch pipe (44). A diversion rod (434) is rotatably connected to the outer side of the rotating shaft of the pressure relief main pipe (41). A diversion plug (435) is fixedly connected to one end of the diversion rod (434), and the other end of the diversion rod (434) is in contact with the pressure relief plate (433).

Images