A steam generator

Abstract

The utility model relates to energy technology field especially relates to a steam generator. Including the casing, be equipped with hearth in the casing, the casing one side is equipped with the air distribution device and the feeding device with hearth connects, hearth upper portion is equipped with heat exchange pipeline system, the top of heat exchange pipeline system is equipped with steam export, the water inlet of heat exchange pipeline system bottom is connected with the water pump drain with pipeline, the water inlet of water pump is connected with the water tank of installing in the other side of casing with water pipeline, be equipped with the smoke exhaust passage in the water tank, install the smoke exhaust passage export place and install the draught fan, and the smoke exhaust passage is linked together with hearth through the clearance of heat exchange pipeline system. The process that high temperature flue gas is discharged outward through the smoke exhaust passage, can preheat the cold water in the water tank, improve the temperature of cold water, after the cold water of preheating enters heat exchange pipeline system again, the fuel consumption of conversion into steam reduces, saves the energy, can promote the heat exchange efficiency of high temperature flue gas and cold water in heat exchange pipeline.

Description

Technical Field

[0001] This utility model relates to the field of energy technology, and in particular to a steam generator. Background Technology

[0002] Currently, a steam generator is a mechanical device that heats water and consumes fuel and other energy sources to produce steam. During operation, biomass fuel is typically fed into the furnace, ignited, and used to produce high-temperature flue gas. This high-temperature flue gas exchanges heat with cold water in heat exchange pipes. The entire device is sealed externally by a casing. The flue gas, after heat exchange, is discharged from the exhaust duct via an induced draft fan, while the steam is discharged from the steam outlet. However, in actual operation, current steam generators still have the following problems: Firstly, according to the new boiler regulations in 2025, the boiler volume has changed from the original water volume to the total volume. This means that the pressurized space in the furnace, including both water and air, must be calculated in terms of volume. However, the existing steam generator is limited to 30L, which cannot achieve a large heat exchange area. The heat exchange efficiency between the high-temperature flue gas in the furnace and the cold water in the heat exchange pipeline is low. As a result, under the new boiler regulations, the volume of traditional steam generators exceeds the standard and does not meet the definition of a steam generator. They are now classified as Class D boilers, which requires corresponding qualifications for production, making it impossible for many traditional small enterprises to produce. Secondly, the overall structural design is unreasonable. The cold water in the water tank enters the heat exchange pipeline directly without preheating. When it is converted into steam, it requires more fuel and is prone to affecting the evaporation rate. Third, when biomass fuel is being transported into the furnace, the flames can easily spread outwards along the fuel until they reach the conveying auger. The flames inside the furnace can also easily burst outwards from the observation port, creating a safety hazard. There is currently no good way to solve these problems.

[0003] In summary, improving the heat exchange efficiency of current steam generators during operation has become a pressing technical challenge for the industry. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model provides a steam generator that solves the problems of small heat exchange area and low heat exchange efficiency between high-temperature flue gas in the furnace and cold water in the heat exchange pipeline in previous steam generators. It also solves the problem that more fuel is needed when cold water in previous steam generators is not preheated and converted into steam.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: A steam generator includes a shell containing a furnace. An air distribution device and a feeding device connected to the furnace are installed on one side of the shell. A heat exchange pipeline system is located at the top of the furnace, with a steam outlet at the top. A water inlet at the bottom of the heat exchange pipeline system is connected to the drain outlet of a water pump via a pipeline. The water inlet of the water pump is connected to a water tank installed on the other side of the shell via a water supply pipeline. An exhaust channel is located inside the water tank for preheating the cold water in the tank. An induced draft fan is installed at the outlet of the exhaust channel. The exhaust channel is connected to the furnace through gaps in the heat exchange pipeline system. Several baffles are installed vertically and horizontally within the heat exchange pipeline system. High-temperature flue gas in the furnace travels along an S-shaped path within the gaps of the heat exchange pipeline system to exchange heat with the system.

[0006] The feeding device includes a feeding pipe connected to a hopper. A feeding auger is installed inside the feeding pipe. One end of the feeding auger leads to the furnace, and the other end is connected to a feeding motor.

[0007] The air distribution device includes a fan, the outlet of which is connected to an air tank, the other end of which leads to the furnace. One side of the air tank is connected to the ignition rod tube in the furnace via a hose, and the other side of the air tank is connected to the blowing pipe on the side of the feeding pipe via a hose.

[0008] An observation port and an ash removal port are provided on the front side of the furnace.

[0009] The lower part of the furnace is connected to one side of the observation port via a return blow pipe.

[0010] The heat exchange pipeline system includes several heat exchange tubes that are vertically spaced around the furnace. The bottom of the heat exchange tubes is connected to the lower cavity, which is connected to a water pump via a pipeline. The top of the heat exchange tubes is connected to the upper cavity, and a steam outlet is installed in the upper cavity.

[0011] The upper cavity is equipped with a safety valve and a pressure gauge.

[0012] A level gauge is installed on the heat exchange tube.

[0013] A superheater is installed between the heat exchange pipeline system and the water tank. The steam outlet of the heat exchange pipeline system is connected to the inlet of the superheater through a pipeline. The top of the superheater is provided with a superheater steam outlet.

[0014] The water tank is concave in shape, with a water inlet and an overflow outlet at the top. The lower part of the exhaust duct is located in the groove of the water tank, the upper part of the exhaust duct extends out of the water tank and connects to the induced draft fan, and the side of the exhaust duct extends out of the water tank and has a flue gas connection port.

[0015] The present invention adopts the above solution and has the following beneficial effects: By installing several baffles in an alternating manner within the heat exchange piping system, the high-temperature flue gas in the furnace travels along an S-shaped path within the gaps of the heat exchange piping system. The structure of the plate connecting pipes increases the heat exchange area of ​​the furnace, which can improve the heat exchange efficiency between the high-temperature flue gas and the cold water in the heat exchange piping, reduce the water volume, and achieve the largest possible evaporation rate within a volume of 30L. By installing the exhaust duct inside the water tank, the cold water in the water tank can be preheated during the process of high-temperature flue gas being discharged outward through the exhaust duct, thereby increasing the temperature of the cold water. The preheated cold water then enters the heat exchange pipeline system, reducing the fuel consumption when it is converted into steam, thus saving energy. The waste heat recovery is integrated into one unit, making the structure more compact and suitable for use by small and medium-sized enterprises. By installing a superheater between the heat exchange pipeline system and the water tank, the superheater is flushed with high-temperature flue gas, thereby reheating the steam-water mixture in the superheater pipeline and improving the dryness of the steam. The superheater can further evaporate the excessive moisture in the saturated steam, thus achieving the national target of less than 3% moisture content. By connecting one side of the gas tank to the air pipe on the side of the feeding pipe via a flexible hose, the biomass fuel is blown into the furnace while preventing the flame from extending outward along the fuel, thus protecting the feeding auger and feeding motor. By connecting the lower part of the furnace to one side of the observation port via a return air pipe, the air in the furnace can be blown towards the observation port through the return air pipe, preventing the flame from escaping outward from the observation port and eliminating safety hazards. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0018] Figure 3 This is a schematic diagram of the front sectional structure of the present invention.

[0019] Figure 4 This is a schematic diagram of the intermediate cross-sectional structure of this utility model.

[0020] In the diagram, 1. Shell, 2. Furnace chamber, 3. Steam outlet, 4. Water pump, 5. Water supply pipeline, 6. Water tank, 7. Exhaust duct, 8. Exhaust fan, 9. Baffle plate, 10. Feeding pipe, 11. Hopper, 12. Feeding auger, 13. Feeding motor, 14. Fan, 15. Air manifold, 16. Ignition rod tube, 17. Blowing pipe, 18. Observation port, 19. Ash removal port, 20. Return blow pipe, 21. Heat exchange pipe, 22. Lower cavity, 23. Upper cavity, 24. Safety valve, 25. Pressure gauge, 26. Level gauge, 27. Superheater, 28. Superheater steam outlet, 29. Water inlet, 30. Overflow port, 31. Flue gas connection port. Detailed Implementation

[0021] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0022] like Figure 1-4 As shown, a steam generator includes a housing 1, inside which a furnace 2 is provided. An air distribution device and a feeding device connected to the furnace 2 are installed on one side of the housing 1. A heat exchange pipeline system is provided at the top of the furnace 2. A steam outlet 3 is provided at the top of the heat exchange pipeline system. The water inlet at the bottom of the heat exchange pipeline system is connected to the drain outlet of a water pump 4 via a pipeline. The water inlet of the water pump 4 is connected to a water tank 6 installed on the other side of the housing 1 via a water supply pipeline 5. A flue gas exhaust channel 7 is provided inside the water tank 6 for preheating the cold water in the water tank 6. An induced draft fan 8 is installed at the outlet of the flue gas exhaust channel 7. The flue gas exhaust channel 7 is connected to the furnace 2 through the gaps in the heat exchange pipeline system. Several baffles 9 are installed vertically and horizontally within the heat exchange pipeline system. The high-temperature flue gas in the furnace 2 travels along an S-shaped path within the gaps in the heat exchange pipeline system to exchange heat with the heat exchange pipeline system.

[0023] The feeding device includes a feeding pipe 10, which is connected to a hopper 11. A feeding auger 12 is installed inside the feeding pipe 10. One end of the feeding auger 12 leads to the furnace 2, and the other end is connected to a feeding motor 13. The hopper 11 is funnel-shaped, and biomass fuel can be added into the hopper 11. When the feeding motor 13 is working, it drives the feeding auger 12 to rotate, and the feeding auger 12 can feed the biomass fuel into the furnace 2.

[0024] The air distribution device includes a blower 14, the outlet of which is connected to an air tank 15. The other end of the air tank 15 leads to the furnace 2. One side of the air tank 15 is connected to the ignition rod tube 16 inside the furnace 2 via a hose for distributing air when the ignition rod is ignited. The other side of the air tank 15 is connected to the blowing pipe 17 on the side of the feeding pipe 10 via a hose. While blowing biomass fuel into the furnace 2, it can prevent the flame from extending outward along the fuel, thus protecting the feeding auger 12 and the feeding motor 13 and eliminating safety hazards.

[0025] The furnace chamber 2 is provided with an observation port 18 and an ash removal port 19 on the front side.

[0026] The lower part of the furnace 2 is connected to one side of the observation port 18 through the return air pipe 20. The air in the furnace 2 can be blown to the observation port 18 through the return air pipe 20, which prevents the flame from shooting out from the observation port 18 and eliminates the safety hazard.

[0027] The heat exchange piping system includes several heat exchange pipes 21 vertically spaced around the furnace 2. The bottom of each heat exchange pipe 21 is connected to a lower cavity 22, which is connected to a water pump 4 via a pipeline. The top of each heat exchange pipe 21 is connected to an upper cavity 23, where a steam outlet 3 is installed. After the water pump 4 starts, water from the water tank 6 can enter the water pump 4 via the water supply pipeline 5 for pressurization, and then enter the lower cavity 22. From there, the water is distributed to each heat exchange pipe 21, heated by the high-temperature flue gas in the furnace 2, and the resulting steam enters the upper cavity 23 and is finally discharged from the steam outlet 3.

[0028] The upper cavity 23 is equipped with a safety valve 24 and a pressure gauge 25. The safety valve 23 can play a safe pressure relief role when the pressure is too high, and the pressure gauge 25 can display the steam pressure in the upper cavity 23.

[0029] A level gauge 26 is installed on the heat exchange tube 21, which can display the water level in the heat exchange tube 26 in real time.

[0030] A superheater 27 is installed between the heat exchange piping system and the water tank 6. The steam outlet 3 of the heat exchange piping system is connected to the inlet of the superheater 27 via a pipe. The top of the superheater 27 is equipped with a superheater steam outlet 28. The steam discharged from the heat exchange piping system can also enter the superheater 27 for further heating via a pipe. The superheater 27 adopts a coil structure and can also exchange heat with the high-temperature flue gas in the furnace 2, ensuring the steam conversion rate. Finally, the steam is discharged from the superheater steam outlet 28.

[0031] The water tank 6 is concave in shape. The top of the water tank 6 is provided with a water inlet 29 and an overflow outlet 30. The lower part of the flue gas passage 7 is located in the groove of the water tank 6. The upper part of the flue gas passage 7 extends out of the water tank 6 and connects to the induced draft fan 8. The side of the flue gas passage 7 extends out of the water tank 6 and is provided with a flue gas connection port 31. The high-temperature flue gas in the furnace 2 enters the flue gas passage 7 through the flue gas connection port 31, which can preheat the cold water in the water tank 6 and increase the temperature of the cold water. After preheating, the cold water enters the heat exchange pipeline system, which reduces the fuel consumption when converting into steam, saves energy, and can also reduce the temperature of the discharged flue gas, avoiding thermal pollution.

[0032] Working principle: During operation, the feeding motor 13 starts, driving the feeding auger 12 inside the feeding pipe 10 to rotate. The feeding auger 12 feeds biomass fuel into the furnace 2. At the same time, the blower 14 starts, and the air blown by the blower 14 enters the furnace through the air tank 15. One side of the air tank 15 is connected to the ignition rod tube 16 inside the furnace 2 through a hose, which is used to supply air to the ignition rod to ignite the fuel. When the fuel burns, high-temperature flue gas is generated in the furnace 2. Under the action of the induced draft fan 8 at the flue gas exhaust channel 7, the high-temperature flue gas travels along an S-shaped route under the action of the baffle 9 of the heat exchange pipeline system, which can improve the heat exchange efficiency between the high-temperature flue gas and the cold water in the heat exchange tube 21. Finally, the high-temperature flue gas enters the flue gas exhaust channel 7 through the flue gas connection port 31. The flue gas exhaust channel 7 is placed in the water tank 6, which can circulate the water in the water tank 6. The cold water is preheated to increase its temperature and reduce the flue gas temperature. The flue gas is then discharged from the induced draft fan 8. At the same time, after the water pump 4 is started, the preheated cold water in the water tank 6 can enter the water pump 4 through the water supply pipeline 5 for pressurization, and then enter the lower cavity 22. The lower cavity 22 distributes the water to each heat exchange tube 21, where it is heated by the high-temperature flue gas in the furnace 2. The generated steam flows into the upper cavity 23 and is finally discharged from the steam outlet 3. In actual use, a superheater 27 can be installed as needed. The steam discharged from the steam outlet 3 can enter the superheater 27 for further heating. The superheater 27 adopts a coil structure and can also exchange heat with the high-temperature flue gas in the furnace 2, ensuring the amount of steam conversion. Finally, the steam is discharged from the superheater steam outlet 28 for use.

[0033] The above specific embodiments should not be construed as limiting the scope of protection of this utility model. For those skilled in the art, any alternative improvements or modifications made to the embodiments of this utility model shall fall within the scope of protection of this utility model.

[0034] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A steam generator, characterized in that: The system includes a shell containing a furnace. An air distribution device and a feeding device connected to the furnace are installed on one side of the shell. A heat exchange pipeline system is located at the top of the furnace, with a steam outlet at the top. The water inlet at the bottom of the heat exchange pipeline system is connected to the drain outlet of a water pump via a pipeline. The water inlet of the water pump is connected to a water tank installed on the other side of the shell via a water supply pipeline. An exhaust duct is located inside the water tank to preheat the cold water in the tank. An induced draft fan is installed at the outlet of the exhaust duct. The exhaust duct is connected to the furnace through gaps in the heat exchange pipeline system. Several baffles are installed vertically and horizontally within the heat exchange pipeline system. The high-temperature flue gas in the furnace travels along an S-shaped path within the gaps of the heat exchange pipeline system to exchange heat with the system.

2. A steam generator according to claim 1, characterized in that: The feeding device includes a feeding pipe connected to a hopper. A feeding auger is installed inside the feeding pipe. One end of the feeding auger leads to the furnace, and the other end is connected to a feeding motor.

3. A steam generator according to claim 2, characterized in that: The air distribution device includes a fan, the outlet of which is connected to an air tank, the other end of which leads to the furnace. One side of the air tank is connected to the ignition rod tube in the furnace via a hose, and the other side of the air tank is connected to the blowing pipe on the side of the feeding pipe via a hose.

4. A steam generator according to claim 1, characterized in that: An observation port and an ash removal port are provided on the front side of the furnace.

5. A steam generator according to claim 4, characterized in that: The lower part of the furnace is connected to one side of the observation port via a return blow pipe.

6. A steam generator according to claim 1, characterized in that: The heat exchange pipeline system includes several heat exchange tubes that are vertically spaced around the furnace. The bottom of the heat exchange tubes is connected to the lower cavity, which is connected to a water pump via a pipeline. The top of the heat exchange tubes is connected to the upper cavity, and a steam outlet is installed in the upper cavity.

7. A steam generator according to claim 6, characterized in that: The upper cavity is equipped with a safety valve and a pressure gauge.

8. A steam generator according to claim 6, characterized in that: A level gauge is installed on the heat exchange tube.

9. A steam generator according to claim 1, characterized in that: A superheater is installed between the heat exchange pipeline system and the water tank. The steam outlet of the heat exchange pipeline system is connected to the inlet of the superheater through a pipeline. The top of the superheater is provided with a superheater steam outlet.

10. A steam generator according to claim 1, characterized in that: The water tank is concave in shape, with a water inlet and an overflow outlet at the top. The lower part of the exhaust duct is located in the groove of the water tank, the upper part of the exhaust duct extends out of the water tank and connects to the induced draft fan, and the side of the exhaust duct extends out of the water tank and has a flue gas connection port.

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