Steam boiler with steam waste heat recovery function

Abstract

The invention discloses a steam boiler with a steam waste heat recovery function, which comprises a steam boiler body, a combustion chamber, a box body, a combustor, a steam pipe, a smoke exhaust pipe, a drainage mechanism, a connecting pipe, a water inlet pipe and a heat exchanger, the combustion chamber is arranged in the steam boiler body, and the combustor is arranged on one side of the combustion chamber; and a steam pipe is arranged at the top of the steam boiler body. According to the steam boiler with the steam waste heat recovery function, in the aspect of waste heat recovery, the heat exchanger of a composite structure of the heat conduction pipe and the spiral pipe is adopted, sensible heat and latent heat of high-temperature smoke in the smoke exhaust pipe are efficiently captured, and heat is rapidly transferred to a water inlet system through low-boiling-point heat conduction liquid; the waste heat of the flue gas which is directly discharged originally is fully recycled, and the energy loss is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of steam boilers, and in particular to a steam boiler with a steam waste heat recovery function. Background Art

[0002] Traditional steam boilers, as heat energy conversion equipment widely used in the industrial field, mainly generate steam by heating water through fuel combustion to meet the heating and power needs of the production process. However, existing steam boilers generally have key problems such as low energy utilization efficiency, insufficient environmental performance and poor operational safety. Specifically, they are:

[0003] Serious waste of waste heat: The high-temperature flue gas generated by combustion is directly discharged through the exhaust pipe, and the sensible heat and latent heat in the flue gas are not effectively recovered, resulting in generally low boiler thermal efficiency and a large amount of energy loss.

[0004] Safety risks are prominent: pressure fluctuations during boiler operation can easily lead to explosion risks, while existing safety devices respond slowly and are unable to cope with sudden overpressure conditions; in addition, the accumulation of condensate in the exhaust pipe can easily corrode equipment, and the drainage mechanism can easily cause flue gas leakage due to blockage.

[0005] Although some existing technologies recover waste heat by adding economizers or air preheaters, there are problems such as low heat exchange efficiency and large equipment footprint; energy-saving solutions that use complex control systems are costly and difficult to promote in small and medium-sized boilers.

[0006] Therefore, it is necessary to provide a new steam boiler with steam waste heat recovery function to solve the above technical problems. Summary of the Invention

[0007] In order to solve the above technical problems, the present invention provides a steam boiler with steam waste heat recovery function.

[0008] The present invention provides a steam boiler with a steam waste heat recovery function, comprising a steam boiler body, a combustion chamber, a housing, a burner, a steam pipe, an exhaust pipe, a drainage mechanism, a connecting pipe, a water inlet pipe, and a heat exchanger. The steam boiler body is provided with a combustion chamber, a burner is provided on one side of the combustion chamber, a steam pipe is provided on the top of the steam boiler body, a water inlet pipe is connected to one side of the steam boiler body, a smoke exhaust pipe is connected to the side of the combustion chamber away from the burner, a plurality of heat exchangers are provided between the smoke exhaust pipe and the water inlet pipe, and a connecting pipe is provided between the steam boiler body and the smoke exhaust pipe. The steam boiler is assembled by combining various components. The burner burns in the combustion chamber to generate heat to heat water, the steam pipe outputs steam, the smoke exhaust pipe discharges smoke, and the heat exchanger can recover the waste heat of the smoke to heat the water in the water inlet pipe, thereby realizing the recovery and utilization of steam waste heat and improving energy utilization.

[0009] Preferably, the connecting pipe is provided with a pressure relief valve, and the exhaust pipe is provided with a one-way valve at the end close to the combustion chamber. The pressure relief valve can automatically open to release pressure when the pressure in the steam boiler body is too high, preventing the steam boiler from being damaged due to excessive pressure and ensuring safe operation of the equipment. The one-way valve can ensure that the flue gas in the exhaust pipe can only be discharged in one direction, preventing outside air from flowing into the combustion chamber and affecting the combustion effect and normal operation of the boiler

[0010] Preferably, the drainage mechanism includes a first drainage pipe, a mounting ring, a spring, and a floating ball. The first drainage pipe is in communication with the bottom of the exhaust pipe, and the inside bottom of the first drainage pipe is provided with an annular boss. The inside bottom of the first drainage pipe is fixedly installed with a mounting ring, and the mounting ring is installed with a spring. The top of the spring is fixedly provided with a floating ball. When condensate accumulates in the exhaust pipe, the condensate flows into the first drainage pipe. As the water level rises, the floating ball rises under the action of buoyancy. When it rises to a certain height, the floating ball pushes open the annular boss, and the condensate is discharged. After the water level drops, the floating ball resets under the action of the spring, achieving automatic drainage and preventing the accumulation of condensate from affecting the performance of the equipment.

[0011] Preferably, the heat exchanger includes heat-conducting pipes and spiral pipes. Both ends of the heat-conducting pipes are provided with spiral pipes in communication with the heat-conducting pipes, and the heat-conducting pipes are provided with heat-conducting liquid. The flue gas in the exhaust pipe contacts the spiral pipe, which increases the heat exchange area. The heat-conducting liquid in the heat-conducting pipe absorbs the heat transferred by the spiral pipe and then transfers the heat to the water in the water inlet pipe. This structure can efficiently realize heat exchange between the flue gas and the water, improving the efficiency of waste heat recovery.

[0012] Preferably, the heat-conducting liquid is one of methanol, acetone, or ammonia. Methanol, acetone, or ammonia all have good heat-conducting properties and can quickly and effectively absorb and transfer heat. In the heat exchanger, they can efficiently transfer the heat of the flue gas in the exhaust pipe to the water in the water inlet pipe, thereby improving the overall effect of steam boiler waste heat recovery. These substances have good applicability under different working conditions.

[0013] Preferably, the bottom of the outside of the steam boiler body is provided with a second drainage pipe, and the bottom of the steam boiler body is provided with a support frame. The second drainage pipe can drain the residual water inside the steam boiler body when cleaning or maintenance is needed. The support frame can stably support the steam boiler body, keeping it horizontal, avoiding tilting due to uneven ground or equipment operation, and ensuring safe and stable operation of the equipment.

[0014] Preferably, the box is filled with thermal insulation material. The thermal insulation material filled in the box can effectively reduce the loss of heat inside the steam boiler body, reduce energy consumption, make the boiler better maintain the set temperature during operation, improve thermal efficiency, and reduce the impact on the surrounding environment caused by heat loss.

[0015] Preferably, the insulation material is rock wool or glass wool. Both rock wool and glass wool have excellent thermal insulation properties, effectively preventing heat transfer and reducing heat loss in steam boilers. They also have certain fire resistance properties, which can improve equipment safety. In addition, these two materials are lightweight, do not add excessive burden to the steam boiler, and are easy to install and maintain.

[0016] Compared with related technologies, the steam boiler with steam waste heat recovery function provided by the present invention has the following beneficial effects:

[0017] The present invention provides a steam boiler with a steam waste heat recovery function. In terms of waste heat recovery, a heat exchanger with a composite structure of heat pipes and spiral tubes is adopted to efficiently capture the sensible heat and latent heat of high-temperature flue gas in the exhaust pipe, and quickly transfer the heat to the water inlet system through a low-boiling point heat transfer fluid, so that the waste heat of the flue gas originally discharged directly can be fully reused, thereby greatly reducing energy loss; in terms of safety assurance, a fast-response pressure relief valve and a flue pipe one-way valve are integrated. The pressure relief valve can be opened instantly to release steam or flue gas when the pressure is abnormal to prevent the boiler from overpressure explosion, and the one-way valve can effectively block the backflow of external air to avoid backfire or flameout in the combustion chamber due to fluctuations in oxygen supply. At the same time, the automatic drainage mechanism accurately controls the discharge of condensed water through a float-spring linkage mechanism, eliminating the risks of equipment corrosion and flue gas leakage caused by accumulated water, and comprehensively improving the safety and stability of system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the three-dimensional structure of a steam boiler with steam waste heat recovery function provided by the present invention;

[0019] Figure 2 A schematic diagram of the three-dimensional structure of the heat exchanger provided by the present invention;

[0020] Figure 3 A schematic diagram of a partial cross-sectional structure of a steam boiler with steam waste heat recovery function provided by the present invention;

[0021] Figure 4 A schematic cross-sectional view of a steam boiler with steam waste heat recovery function provided by the present invention;

[0022] Figure 5 This is a structural diagram of the drainage mechanism provided by the present invention.

[0023] The figure mark: 1, steam boiler body; 2, combustion chamber; 3, box; 4, burner; 5, steam pipe; 6, exhaust pipe; 7, connecting pipe; 8, water inlet pipe; 9, heat exchanger; 10, pressure relief valve; 11, check valve; 12, first drain pipe; 13, mounting ring; 14, spring; 15, floating ball; 16, heat conducting pipe; 17, spiral pipe; 18, second drain pipe; 19, support frame. DETAILED DESCRIPTION

[0024] The application will be further described below in conjunction with the drawings and embodiments.

[0025] Please see Figure 1-Figure 5 , wherein, Figure 1 the three-dimensional structure schematic diagram of the steam boiler with steam waste heat recovery function provided by the application is provided; Figure 2 the three-dimensional structure schematic diagram of the heat exchanger provided by the application is provided; Figure 3 the partial cross-sectional structure schematic diagram of the steam boiler with steam waste heat recovery function provided by the application is provided; Figure 4 the cross-sectional structure schematic diagram of the steam boiler with steam waste heat recovery function provided by the application is provided; Figure 5 the structure schematic diagram of the drainage mechanism provided by the application is provided.

[0026] In the specific implementation process, as Figure 1-Figure 5 indicated, a steam boiler with steam waste heat recovery function includes steam boiler body 1, combustion chamber 2, box 3, burner 4, steam pipe 5, exhaust pipe 6, drainage mechanism, connecting pipe 7, water inlet pipe 8, and heat exchanger 9. Steam boiler body 1 is the core bearing structure of the entire device, providing space for steam generation; combustion chamber 2 is arranged in steam boiler body 1 and is the place where fuel burns to generate heat; box 3 is arranged outside steam boiler body 1 and is filled with thermal insulation material inside, playing a role of thermal insulation; burner 4 is installed on one side of combustion chamber 2, used for injecting fuel into combustion chamber 2 and igniting, providing power for the combustion process; steam pipe 5 is arranged at the top of steam boiler body 1, used for outputting generated steam; exhaust pipe 6 is connected to the side of combustion chamber 2 away from burner 4, used for discharging high-temperature flue gas generated by combustion; water inlet pipe 8 is connected to one side of steam boiler body 1, used for supplementing water in the boiler; heat exchanger 9 is arranged between exhaust pipe 6 and water inlet pipe 8, used for recovering the waste heat of flue gas in exhaust pipe 6 and heating the water in water inlet pipe 8; connecting pipe 7 is arranged between steam boiler body 1 and exhaust pipe 6, playing a role of connection and flow guide; the drainage mechanism is used for draining excess water in the steam boiler.

[0027] The steam boiler body 1 is made of high-quality steel with good strength and corrosion resistance. It is cylindrical in shape and has multiple reinforcing ribs inside to enhance its structural strength and ensure safe and stable operation under high pressure.

[0028] A second drain pipe 18 is installed at the bottom of the outer side of the steam boiler body 1. This drain pipe is used to regularly drain impurities and sewage deposited within the steam boiler body 1 to ensure the cleanliness of the water inside the boiler. A valve is installed on the second drain pipe 18, and the drain operation is achieved by controlling the opening and closing of the valve. A support frame 19 is installed at the bottom of the steam boiler body 1. The support frame 19 is made of a sturdy metal material and has sufficient load-bearing capacity. It can firmly support the steam boiler body 1 on the ground and prevent the boiler from shaking or tilting during use.

[0029] The combustion chamber 2, located within the steam boiler body 1, is the core area where fuel is burned. The combustion chamber 2 is cylindrical in shape, and its inner wall is lined with a high-temperature and corrosion-resistant material, such as ceramic fiber or refractory bricks, to protect the inner wall of the combustion chamber 2 from erosion by the high-temperature flame and extend its service life.

[0030] Burner 4 is installed on one side of combustion chamber 2 and consists of a fuel supply system, an air supply system, and an ignition system. The fuel supply system delivers fuel at a specific pressure and flow rate to the nozzle of burner 4. The air supply system uses a fan to deliver air into burner 4 for thorough mixing with the fuel. The ignition system ignites the mixed fuel and air, initiating the combustion process. When burner 4 is operating, the fuel burns violently in combustion chamber 2, generating a large amount of high-temperature heat. This heat is transferred through the inner walls of combustion chamber 2 to the water in steam boiler body 1, gradually heating and vaporizing the water, generating steam.

[0031] The housing 3 is located outside the steam boiler body 1, forming an enclosed space. Made of sheet metal, the housing 3 offers excellent sealing and strength. The interior of the housing 3 is filled with insulation material. In this embodiment, rock wool or glass wool is used. Both rock wool and glass wool offer excellent thermal insulation properties, effectively reducing heat dissipation and lowering energy consumption. Furthermore, these two insulation materials offer excellent fire resistance and sound absorption properties, enhancing the safety of the steam boiler.

[0032] The steam pipe 5 is located on top of the steam boiler body 1. Its function is to transport the steam generated within the steam boiler to the equipment or systems that require it. The steam pipe 5 is typically made of seamless steel pipe, which offers excellent resistance to high temperatures and high pressures. To minimize heat loss during steam transportation, the outer surface of the steam pipe 5 is typically wrapped with a layer of insulating material, such as aluminum silicate fiber felt. Furthermore, the steam pipe 5 is equipped with safety accessories such as a safety valve and pressure gauge to monitor and control steam pressure, ensuring safe and reliable steam transportation.

[0033] The smoke exhaust pipe 6 is connected to the side of the combustion chamber 2 away from the burner 4 and is used to exhaust the high-temperature flue gas generated by combustion. A one-way valve 11 is provided at the end of the smoke exhaust pipe 6 close to the combustion chamber 2. The function of the one-way valve 11 is to prevent external air from flowing back into the combustion chamber 2 through the smoke exhaust pipe 6 and affecting the stability of combustion. At the same time, the one-way valve 11 can also prevent the backflow of smoke to a certain extent, ensuring smooth smoke exhaust. During the smoke exhaust process of the smoke exhaust pipe 6, the smoke temperature is relatively high. In order to make full use of the residual heat in the smoke, several heat exchangers 9 are provided between the smoke exhaust pipe 6 and the water inlet pipe 8.

[0034] Connecting pipe 7 is installed between steam boiler body 1 and flue gas exhaust pipe 6, providing a connection and conduction. A pressure relief valve 10 is installed on connecting pipe 7. This safety device automatically opens when the pressure inside steam boiler body 1 exceeds a set value, releasing some steam or flue gas to reduce the pressure inside the boiler and prevent accidents such as explosions caused by excessive pressure. The set pressure of pressure relief valve 10 should be adjusted appropriately based on the steam boiler's design parameters and safety requirements.

[0035] A water inlet pipe 8 is connected to one side of the steam boiler body 1 and is used to replenish water into the boiler. To ensure that the water entering the boiler fully absorbs the waste heat from the flue gas and steam, a heat exchanger 9 is installed between the water inlet pipe 8 and the flue gas exhaust pipe 6. The water inlet pipe 8 is typically equipped with a flow control valve and a check valve. The flow control valve adjusts the amount of water entering the boiler to meet the water demand under different boiler loads. The check valve prevents water in the boiler from flowing back into the water source, ensuring the normal operation of the water supply system.

[0036] Heat exchanger 9 is used to recover waste heat from the steam boiler. It includes a heat pipe 16 and a spiral tube 17. The spiral tube 17 is connected to the heat pipe 16 at both ends. Heat pipe 16 contains a heat transfer fluid, which can be methanol, acetone, or ammonia. These fluids have excellent thermal conductivity and a low boiling point, allowing them to vaporize at low temperatures, absorb heat from the flue gas, and then transfer that heat to the water entering the boiler.

[0037] The drainage mechanism includes a first drain pipe 12, a mounting ring 13, a spring 14, and a float 15. The first drain pipe 12 is connected to the bottom of the smoke exhaust pipe 6 and is used to drain condensed water generated within the pipe. An annular boss is provided on the inner bottom of the first drain pipe 12 to control the position of the mounting ring 13. The mounting ring 13 is fixedly mounted on the inner bottom of the first drain pipe 12, and a spring 14 is mounted on top of the spring 14. A float 15 is fixedly mounted on the top of the spring 14.

[0038] When steam is introduced into the exhaust pipe 6 and condensed water is generated after the steam releases heat, the condensed water can flush the spiral tube 17, maintaining the good thermal conductivity of the spiral tube 17, and the condensed water will flow into the first drain pipe 12. As the condensed water level rises, the float 15 gradually rises under the action of buoyancy. When the water level rises to a certain height, the float 15 overcomes the elastic force of the spring 14, opens the drain port, and the condensed water is discharged through the drain port. When the condensed water level drops, the float 15 drops under the action of the spring 14, re-sealing the drain port to prevent smoke leakage. This drainage mechanism has a simple structure, reliable operation, and can automatically and effectively discharge the condensed water in the exhaust pipe 6.

[0039] The specific working process of the steam boiler with steam waste heat recovery function provided by the present invention is as follows: After the high-temperature flue gas is discharged from the combustion chamber 2, it enters the flue gas pipe 6. In the flue gas pipe 6, the flue gas contacts the heat exchanger 9. The heat transfer liquid in the heat exchanger 9 absorbs the heat in the flue gas and vaporizes. The vaporized heat transfer liquid steam flows in the heat transfer pipe 16, and transfers the heat to the water in the water inlet pipe 8 through the spiral tube 17 to preheat the water. After the preheated water enters the steam boiler body 1, it can be heated into steam more quickly, thereby improving energy utilization efficiency. The temperature of the flue gas after heat exchange in the heat exchanger 9 is reduced, and then discharged from the boiler through the flue gas pipe 6. The heat exchanger 9 can also recover the heat of the steam discharged due to excessive pressure in the steam boiler, thereby improving energy utilization efficiency.

[0040] By installing a heat exchanger 9 between the exhaust pipe 6 and the water inlet pipe 8, the waste heat in the flue gas is effectively recovered and the water entering the boiler is preheated. After entering the boiler, the preheated water can be heated to steam more quickly, reducing fuel consumption and lowering energy costs.

[0041] Due to the improved energy efficiency, fuel combustion is more complete, reducing harmful gas emissions. At the same time, by recovering waste heat from the flue gas, the flue gas emission temperature is lowered, reducing thermal pollution to the environment. This steam boiler meets the relevant national environmental protection standards and has excellent environmental performance.

[0042] The pressure relief valve 10 on the connecting pipe 7 automatically opens when boiler pressure is too high, discharging some steam or flue gas to prevent safety accidents such as boiler explosions. The one-way valve 11 on the exhaust pipe 6 prevents the backflow of outside air into the combustion chamber 2, ensuring combustion stability. The drainage mechanism automatically and effectively drains condensed water from the exhaust pipe 6, preventing it from affecting the equipment and ensuring its normal operation.

[0043] The steam boiler with steam waste heat recovery function of the present invention realizes efficient energy utilization, environmentally friendly operation, safety and reliability, and extended service life.

[0044] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A steam boiler with steam waste heat recovery function, characterized in that: The invention comprises a steam boiler body (1), a combustion chamber (2), a box (3), a burner (4), a steam pipe (5), a smoke exhaust pipe (6), a drainage mechanism, a connecting pipe (7), a water inlet pipe (8) and a heat exchanger (9). The steam boiler body (1) is provided with a combustion chamber (2), one side of the combustion chamber (2) is provided with a burner (4), the top of the steam boiler body (1) is provided with a steam pipe (5), one side of the steam boiler body (1) is connected to the water inlet pipe (8), the side of the combustion chamber (2) away from the burner (4) is connected to the smoke exhaust pipe (6), a plurality of heat exchangers (9) are provided between the smoke exhaust pipe (6) and the water inlet pipe (8), and a connecting pipe (7) is provided between the steam boiler body (1) and the smoke exhaust pipe (6).

2. The steam boiler with steam waste heat recovery function according to claim 1, characterized in that: The connecting pipe (7) is provided with a pressure relief valve (10), and the end of the smoke exhaust pipe (6) close to the combustion chamber (2) is provided with a one-way valve (11).

3. The steam boiler with steam waste heat recovery function according to claim 1, characterized in that: The drainage mechanism comprises a first drainage pipe (12), a mounting ring (13), a spring (14) and a float (15); the first drainage pipe (12) is connected to the bottom of the smoke exhaust pipe (6); an annular boss is provided at the inner bottom of the first drainage pipe (12); a mounting ring (13) is fixedly installed at the inner bottom of the first drainage pipe (12); a spring (14) is installed on the mounting ring (13); and a float (15) is fixedly provided on the top of the spring.

4. The steam boiler with steam waste heat recovery function according to claim 1, characterized in that: The heat exchanger (9) comprises a heat conducting pipe (16) and a spiral pipe (17), both ends of the heat conducting pipe (16) are provided with a spiral pipe (17) which is interconnected with the heat conducting pipe (16), and a heat conducting liquid is provided in the heat conducting pipe (16).

5. The steam boiler with steam waste heat recovery function according to claim 4, characterized in that: The heat transfer fluid is one of methanol, acetone or ammonia.

6. The steam boiler with steam waste heat recovery function according to claim 1, characterized in that: A second drain pipe (18) is provided at the bottom of the outer side surface of the steam boiler body (1), and a support frame (19) is provided at the bottom of the steam boiler body (1).

7. The steam boiler with steam waste heat recovery function according to claim 1, characterized in that: The box (3) is filled with heat-insulating material.

8. The steam boiler with steam waste heat recovery function according to claim 7, characterized in that: The thermal insulation material is rock wool or glass wool.

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