A heat exchange mechanism, a fuel oil / gas gas steam generator, and a biomass steam generator

Abstract

This utility model discloses a heat exchange mechanism, a fuel oil / gas-fired steam generator, and a biomass steam generator. The heat exchange mechanism is applicable to fuel oil / gas-fired steam generators, biomass steam generators, and steam generators using liquid fuels such as alcohols. It includes an upper drum and a lower drum arranged vertically. The upper drum is connected to the main steam valve seat, and the lower drum is connected to the water supply pipe seat. Both the upper and lower drums are closed annular cavities, connected by multiple vertically arranged first finned tubes. All the first finned tubes are arranged in a ring shape, and the cylindrical inner cavity formed by all the first finned tubes serves as the first heat exchange cavity. The bottom or top of the first heat exchange cavity is connected to or communicates with a heat source through an interface. This utility model employs a two-stage heat exchange process combined with a multi-layer finned tube layout and an upper and lower drum design, significantly improving heat exchange efficiency and steam evaporation rate.

Description

Technical Field

[0001] This utility model relates to a heat exchange mechanism, a fuel oil / gas steam generator, and a biomass steam generator. Background Technology

[0002] Whether it's an oil / gas-fired steam generator or a biomass steam generator, the heat exchange efficiency and evaporation efficiency of its heat exchange mechanism are usually key design considerations. Currently, both oil / gas-fired steam generators and biomass steam generators generally suffer from low steam evaporation rates and low heat exchange efficiency. Utility Model Content

[0003] This utility model provides a heat exchange mechanism, a fuel oil / gas steam generator, and a biomass steam generator, aiming to improve heat exchange efficiency and steam evaporation rate by optimizing the design of the heat exchange mechanism.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A heat exchange mechanism is provided for installation within a steam generator. It includes an upper drum and a lower drum arranged vertically. The upper drum is connected to a main steam valve seat, and the lower drum is connected to a water supply pipe seat. Both the upper and lower drums are closed annular cavities. The upper and lower drums are connected by a plurality of vertically arranged first finned tubes. All the first finned tubes are arranged in a ring shape, and the cylindrical inner cavity formed by all the first finned tubes serves as a first heat exchange cavity. The bottom or top of the first heat exchange cavity is connected to or communicates with a heat source via an interface. The heat source is high-temperature flue gas generated by the combustion of fuel oil or natural gas, or high-temperature flue gas generated by the combustion of biomass in a combustion chamber, or high-temperature flue gas generated by the combustion of other liquid fuels such as alcohols.

[0006] Preferably, a first folded chimney covers the outside of all the first finned tubes arranged in a ring shape. Multiple second finned tubes I are provided on the outside of the first folded chimney. All the second finned tubes I are arranged along the first folded chimney and are in a single-layer or multi-layer ring shape. A second folded chimney covers the outside of the second finned tubes I arranged in a ring shape. The ring-shaped cavity formed between the first folded chimneys serves as a second heat exchange cavity. The second heat exchange cavity is connected to the first heat exchange cavity. The upper end of all the second finned tubes I is connected to the upper boiler drum, and the lower end of all the second finned tubes I is connected to the lower boiler drum.

[0007] Preferably, a plurality of second finned tubes II are provided on the inner side of all the first finned tubes arranged in a ring shape. All the second finned tubes II are arranged in a single layer or multiple layers in a ring shape. The upper end of all the second finned tubes II is connected to the upper drum through a bend, and the lower end of all the second finned tubes II is connected to the lower drum through a bend.

[0008] Preferably, a spirally rising coil is provided in the first or second heat exchange chamber. When the coil is an integral design, in case one, the main steam valve seat of the upper boiler drum is connected to the bottom port of the coil (32) through a steam pipe (33), and the top port of the coil is connected to the steam outlet to generate superheated steam; in case two, the coil is connected to the lower boiler drum through a water supply pipe seat to preheat the water that is about to enter the lower boiler drum; when the coil is a two-part design, the bottom port of the upper coil is connected to the main steam valve seat of the upper boiler drum through a steam pipe, and the top port of the upper coil is connected to the steam outlet to generate superheated steam; the top port of the lower coil is connected to the energy-saving device water supply pipe seat, and the bottom port of the lower coil is connected to the lower boiler drum to preheat the water that is about to enter the lower boiler drum.

[0009] Preferably, the upper pot drum is composed of an upper pot drum outer cylinder, an upper pot drum inner cylinder, an upper pot drum tube plate, and an upper pot drum universal tube plate connected together; correspondingly, the lower pot drum is composed of a lower pot drum outer cylinder, a lower pot drum inner cylinder, a lower pot drum universal tube plate, and a lower pot drum tube plate connected together.

[0010] An oil-fired gas steam generator includes an outer shell, inside which are a heat exchange mechanism and an economizer. The main steam valve seat on the heat exchange mechanism is connected to the steam outlet, and the exhaust port of the heat exchange mechanism is connected to the economizer. A burner is installed at the top or bottom of the outer shell. Oil and gas enter the heat exchange mechanism from above or below for combustion and heat exchange. The heat exchange mechanism includes an upper drum and a lower drum arranged vertically. The upper drum is connected to the main steam valve seat, and the lower drum is connected to the water supply pipe seat. Both the upper drum and the lower drum are closed annular cavities. The upper drum and the lower drum are connected by a plurality of vertically arranged first finned tubes. All the first finned tubes are arranged in an annular shape, and the cylindrical inner cavity formed by all the first finned tubes serves as the first heat exchange cavity.

[0011] Preferably, a first folded chimney covers the outside of all the first finned tubes arranged in a ring shape. Multiple second finned tubes I are provided on the outside of the first folded chimney. All the second finned tubes I are arranged along the first folded chimney in a single or multiple ring shape. A second folded chimney covers the outside of the second finned tubes I arranged in a ring shape. The ring-shaped cavity formed between the first folded chimney and the second folded chimney serves as a second heat exchange cavity. The second heat exchange cavity is connected to the first heat exchange cavity on one hand and to the energy-saving device through the exhaust port on the other hand. The upper end of all the second finned tubes I is connected to the upper boiler drum, and the lower end of all the second finned tubes I is connected to the lower boiler drum.

[0012] A biomass steam generator includes an outer shell, inside which are a heat exchange mechanism and an economizer. The main steam valve seat on the heat exchange mechanism is connected to the steam outlet, and the exhaust port of the heat exchange mechanism is connected to the economizer. Below the heat exchange mechanism is a combustion chamber formed by stacked furnace walls, and a grate is provided at the bottom of the combustion chamber. A feeding mechanism for conveying biomass is provided on one side of the combustion chamber. The flame and flue gas generated when the biomass is burned in the combustion chamber enter the heat exchange mechanism for heat exchange. The heat exchange mechanism includes an upper drum and a lower drum arranged vertically. The upper drum is connected to the main steam valve seat, and the lower drum is connected to the water supply pipe seat. Both the upper drum and the lower drum are closed ring-shaped cavities. The upper drum and the lower drum are connected by a plurality of vertically arranged first finned tubes. All the first finned tubes are arranged in a ring shape, and the cylindrical inner cavity formed by all the first finned tubes serves as the first heat exchange cavity.

[0013] Preferably, a first folded chimney covers the outside of all the first finned tubes arranged in a ring shape. Multiple second finned tubes I are provided on the outside of the first folded chimney. All the second finned tubes I are arranged along the first folded chimney in a single or multiple ring shape. A second folded chimney covers the outside of the second finned tubes I arranged in a ring shape. The ring-shaped cavity formed between the first folded chimney and the second folded chimney serves as a second heat exchange cavity. The second heat exchange cavity is connected to the first heat exchange cavity. The second heat exchange cavity is connected to the energy-saving device through the exhaust port. The upper end of all the second finned tubes I is connected to the upper boiler drum, and the lower end of all the second finned tubes I is connected to the lower boiler drum.

[0014] Preferably, a plurality of second finned tubes II are provided on the inner side of all the first finned tubes arranged in a ring shape. All the second finned tubes II are arranged in a single layer or multiple layers in a ring shape. The upper end of all the second finned tubes II is connected to the upper drum through a bend, and the lower end of all the second finned tubes II is connected to the lower drum through a bend.

[0015] Preferably, the energy-saving device has an internal cavity divided into upper and lower parts. Water pipes are arranged in the upper cavity, through which water flows. One end of the water pipe is a cold water inlet connected to an external water tank, and the other end is a hot water outlet connected to a water supply pipe. Air pipes are arranged in the lower cavity, through which air flows. One end of the air pipe is a cold air inlet connected to external air, and the other end is a hot air outlet connected to the combustion chamber. The internal cavity of the energy-saving device is connected to the exhaust port of the heat exchange mechanism.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. Two heat exchange processes: The flue gas passes through the first heat exchange chamber and the second heat exchange chamber in sequence, forming two reverse flows, which prolongs the residence time of the flue gas in the equipment, fully contacts the finned tubes, reduces heat loss, and significantly improves heat exchange efficiency.

[0018] 2. Multi-layer finned tube layout: The dense annular arrangement maximizes the heating surface, increases the heat exchange area, and accelerates the evaporation rate; the flue gas flows around in a circular pattern, ensuring uniform heat distribution and avoiding localized overheating or heat exchange dead zones.

[0019] 3. The energy-saving device has dual preheating functions: water preheating and air preheating, recovering waste heat from flue gas, reducing exhaust temperature, improving combustion efficiency, and reducing fuel consumption;

[0020] 4. The structural design of the upper and lower drums facilitates manufacturing and maintenance, enhances structural stability, and reduces weld stress;

[0021] 5. The heat exchange mechanism has a wide range of applications and is generally applicable to fuel oil and gas steam generators, biomass steam generators, and other alcohol-based liquid fuels. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] Figure 1 This is a schematic diagram of the heat exchange mechanism of this utility model. Figure 1 (face);

[0024] Figure 2 for Figure 1 Side view;

[0025] Figure 3 for Figure 1 Top view;

[0026] Figure 4 This is a schematic diagram of the heat exchange mechanism of this utility model. Figure 2 (face);

[0027] Figure 5 for Figure 4 Side view;

[0028] Figure 6 for Figure 4 Top view;

[0029] Figure 7 for Figure 4 Top view;

[0030] Figure 8 This is a structural schematic diagram (front view) of Embodiment 1 of the present utility model;

[0031] Figure 9 This is a structural schematic diagram (side view) of Embodiment 1 of the present utility model;

[0032] Figure 10 This is a partial structural schematic diagram (top view) of Embodiment 1 of the present utility model;

[0033] Figure 11 This is a partial structural schematic diagram (top view) of Embodiment 1 of the present utility model;

[0034] Figure 12 This is a flue gas flow direction diagram of Embodiment 1 of this utility model;

[0035] Figure 13 This is a diagram showing the flow direction of the soft drink in Embodiment 1 of this utility model;

[0036] Figure 14 This is a structural schematic diagram (front view) of Embodiment 2 of the present invention;

[0037] Figure 15 This is a structural schematic diagram (front view) of Embodiment 3 of the present invention;

[0038] Figure 16 This is a structural schematic diagram (side view) of Embodiment 3 of the present invention;

[0039] Figure 17 This is a partial structural schematic diagram (top view) of Embodiment 3 of the present invention;

[0040] Figure 18 This is a schematic diagram (front view) of the energy-saving device in Embodiment 3 of this utility model;

[0041] Figure 19 This is a side view of the energy-saving device in Embodiment 3 of this utility model;

[0042] Figure 20 for Figure 18 Sectional view along line A-A in the middle;

[0043] Figure 21 for Figure 18 Sectional view along line B-B in the middle;

[0044] Figure 22 This is a flue gas flow direction diagram of Embodiment 3 of this utility model;

[0045] Figure 23 This is a diagram showing the flow direction of the soda / water in Embodiment 3 of this utility model;

[0046] Figure 24 This is a structural schematic diagram (front view) of Embodiment 4 of the present invention;

[0047] Figure 25 This is a structural schematic diagram (front view) of Embodiment 5 of the present utility model;

[0048] Figure 26This is a schematic diagram of the structure of the heat exchange mechanism and coil assembly of this utility model. Figure 1 ;

[0049] Figure 27 This is a schematic diagram of the structure of the heat exchange mechanism and coil assembly of this utility model. Figure 2 ;

[0050] Figure 28 This is a schematic diagram of the structure of the heat exchange mechanism and coil assembly of this utility model. Figure 3 ;

[0051] Figure 29 This is a structural schematic diagram (front view) of Embodiment Six of this utility model;

[0052] Figure 30 This is a top view of the structure of Embodiment Six of this utility model;

[0053] Figure 31 This is a structural schematic diagram (front view) of Embodiment Seven of the present utility model;

[0054] Figure 32 This is a structural schematic diagram (front view) of Embodiment 8 of this utility model.

[0055] In the diagram: 1. Main steam valve seat; 2. Upper boiler outer cylinder; 3. Central tube seat; 4. Upper boiler universal tube sheet; 5. Bend; 6. Upper boiler upper tube sheet; 7. Upper boiler inner cylinder; 8. Second finned tube I; 9. Second finned tube II; 10. First finned tube; 11. Lower boiler outer cylinder; 12. Lower boiler inner cylinder; 13. Lower boiler lower tube sheet; 14. Lower boiler universal tube sheet; 15. Drainage pipe seat; 16. Safety valve seat; 17. Water supply pipe seat; 18. Pressure gauge seat; 19. Water level gauge; 20. Burner interface; 21. First fold chimney; 22. Second fold chimney; 23. Eco-friendly device; 24. Outer shell; 25. Burner; 26. Insulation layer; 27. Feeding mechanism; 28. Furnace wall; 29. ​​Chain grate; 30. Reciprocating grate; 31. Fixed grate; 32. Coil; 33. Steam duct; 34. Other heat sources.

[0056] Cold water inlet 23-1, hot water outlet 23-2, cold air inlet 23-3, hot air outlet 23-4, water pipe 23-5, gas pipe 23-6. Detailed Implementation

[0057] This section will describe in detail the specific embodiments of this utility model.

[0058] like Figures 1 to 3As shown, this utility model provides a heat exchange mechanism for installation inside a steam generator. It includes an upper drum and a lower drum arranged vertically. The upper drum is connected to the main steam valve seat 1, and the lower drum is connected to the water supply pipe seat 17. Both the upper and lower drums are closed annular cavities. The upper and lower drums are connected by a plurality of vertically arranged first finned tubes 10. All the first finned tubes 10 are arranged in an annular shape, and the cylindrical inner cavity formed by all the first finned tubes 10 serves as the first heat exchange cavity. The bottom or top of the first heat exchange cavity is connected to or communicates with a heat source through an interface. The heat source is high-temperature flue gas generated by the combustion of fuel oil or gas, or high-temperature flue gas generated by the combustion of biomass in the combustion chamber, or high-temperature flue gas generated by the combustion of liquid fuels such as alcohols.

[0059] Furthermore, a first folded chimney 21 is provided on the outside of all the first finned tubes 10 arranged in a ring shape. Multiple second finned tubes I8 are provided on the outside of the first folded chimney 21. All the second finned tubes I8 are arranged along the first folded chimney 21 in a single or multiple ring shape. A second folded chimney 22 is provided on the outside of the second finned tubes I8 arranged in a ring shape. The ring-shaped cavity formed between the first folded chimney 21 and the second folded chimney 22 serves as a second heat exchange cavity. The second heat exchange cavity is connected to the first heat exchange cavity. The upper end of all the second finned tubes I8 is connected to the upper boiler drum, and the lower end of all the second finned tubes I8 is connected to the lower boiler drum.

[0060] Furthermore, continue as Figures 4 to 7 As shown, multiple second finned tubes II9 are provided inside all the first finned tubes 10 arranged in a ring shape. All the second finned tubes II9 are arranged in a single layer or multiple layers of ring shape. The upper end of all the second finned tubes II9 is ​​connected to the upper drum through the bent tube 5, and the lower end of all the second finned tubes II9 is ​​connected to the lower drum through the bent tube 5.

[0061] Furthermore, a spirally rising coil 32 is provided within the first or second heat exchange cavity. When the coil 32 is an integral design, such as... Figure 26 In scenario one, the main steam valve seat 1 of the upper boiler drum is connected to the bottom port of the coil 32 via a steam pipe 33, and the top port of the coil 32 is connected to the steam outlet to generate superheated steam; Figure 27 In scenario two, coil 32 is connected to the lower boiler drum via water supply pipe seat 17. Coil 32 can be connected to energy-saving device 23 for further preheating of the water entering the lower boiler drum. Figure 28As shown, when the coil 32 is designed as a two-part structure, the bottom port of the upper coil is connected to the main steam valve seat 1 of the upper boiler drum via a steam pipe 33, and the top port of the upper coil is connected to the steam outlet to generate superheated steam. Similarly, the top port of the lower coil is connected to the hot water outlet 23-2 of the economizer, and the bottom port of the lower coil is connected to the lower boiler drum. The lower part of the coil can also be connected to the economizer 23 to preheat the water entering the lower boiler drum. Further, the upper boiler drum is composed of an outer cylinder 2, an inner cylinder 7, an upper tube sheet 6, and a universal tube sheet 4. Correspondingly, the lower boiler drum is composed of an outer cylinder 11, an inner cylinder 12, a universal tube sheet 14, and a lower tube sheet 13.

[0062] Example 1

[0063] like Figures 8 to 11 As shown, an oil-fired gas steam generator includes an outer shell 24. Inside the outer shell 24, there is a heat exchange mechanism and an economizer 23. The main steam valve seat 1 on the heat exchange mechanism is connected to the steam outlet, and the exhaust port of the heat exchange mechanism is connected to the economizer 23. A burner 25 is installed at the bottom of the outer shell 24. The burner 25 is connected to a first heat exchange chamber through a burner interface. The oil-fired gas enters the heat exchange mechanism from below and is burned and undergoes heat exchange. The heat exchange mechanism includes an upper drum and a lower drum arranged vertically. The upper drum is connected to the main steam valve seat 1, and the lower drum is connected to the water supply pipe seat 17. Both the upper drum and the lower drum are closed ring-shaped cavities. The upper drum and the lower drum are connected by a plurality of vertically arranged first finned tubes 10. All the first finned tubes 10 are arranged in a ring shape, and the cylindrical inner cavity formed by all the first finned tubes 10 serves as the first heat exchange chamber.

[0064] A first folded chimney 21 covers the outside of all the first finned tubes 10 arranged in a ring shape. Multiple second finned tubes I8 are provided on the outside of the first folded chimney 21. All the second finned tubes I8 are arranged along the first folded chimney 21 in a single or multiple ring shape. A second folded chimney 22 covers the outside of the second finned tubes I8 arranged in a ring shape. The ring-shaped cavity formed between the first folded chimney 21 and the second folded chimney 22 serves as a second heat exchange cavity. The second heat exchange cavity is connected to the first heat exchange cavity on one hand and to the energy-saving device 23 through the exhaust port on the other hand. The upper end of all the second finned tubes I8 is connected to the upper boiler drum, and the lower end of all the second finned tubes I8 is connected to the lower boiler drum.

[0065] A central tube seat 3 is installed at the center of the upper drum. The central tube seat 3 is connected to the first heat exchange chamber. The upper end of the central tube seat 3 extends out of the outer shell 24. The central tube seat 3 can be used as an explosion-proof tube seat or as a dust removal door.

[0066] An insulation layer is sandwiched between the second chimney 22 and the outer shell 24 to serve as a heat storage and insulation layer.

[0067] The upper and lower drums are also respectively equipped with a drain pipe seat 15, a safety valve seat 16, a pressure gauge seat 18, and a water level gauge 19.

[0068] like Figure 12 As shown, fuel gas is injected directly into the first heat exchange chamber from below, where it burns to produce high-temperature flue gas. This high-temperature flue gas flows upwards within the first heat exchange chamber, washing over the inner side of the annularly arranged first finned tubes 10. Heat is transferred through the tube walls to the water inside the tubes, heating the water and generating steam. After rising to the top, the flue gas is blocked and deflected by the first deflector 21, entering the second heat exchange chamber. Within the annular chamber, the flue gas flows downwards, washing over the outer side of the outer ring of second finned tubes I8, undergoing another heat exchange. The cooled flue gas enters the economizer 23 through the exhaust port at the bottom of the second heat exchange chamber.

[0069] like Figure 13 As shown, water enters the lower boiler drum through the water supply pipe seat 17, then rises to the first finned tube 10 and the second finned tube I8, vaporizes after being heated and flows into the upper boiler drum, and is discharged as steam through the main steam valve seat 1.

[0070] Example 2

[0071] like Figure 14 As shown, an oil-fired gas steam generator includes an outer shell 24. Inside the outer shell 24, there is a heat exchange mechanism and an economizer 23. The main steam valve seat 1 on the heat exchange mechanism is connected to the steam outlet, and the exhaust port of the heat exchange mechanism is connected to the economizer 23. A burner 25 is installed on the top of the outer shell 24. The burner 25 is connected to the first heat exchange chamber through the burner interface. The oil-fired gas enters the heat exchange mechanism from the top and is burned and undergoes heat exchange. The heat exchange mechanism includes an upper drum and a lower drum arranged vertically. The upper drum is connected to the main steam valve seat 1, and the lower drum is connected to the water supply pipe seat 17. Both the upper drum and the lower drum are closed ring-shaped cavities. The upper drum and the lower drum are connected by a plurality of vertically arranged first finned tubes 10. All the first finned tubes 10 are arranged in a ring shape, and the cylindrical inner cavity formed by all the first finned tubes 10 serves as the first heat exchange chamber.

[0072] A first folded chimney 21 covers the outside of all the first finned tubes 10 arranged in a ring shape. Multiple second finned tubes I8 are provided on the outside of the first folded chimney 21. All the second finned tubes I8 are arranged along the first folded chimney 21 in a single or multiple ring shape. A second folded chimney 22 covers the outside of the second finned tubes I8 arranged in a ring shape. The ring-shaped cavity formed between the first folded chimney 21 and the second folded chimney 22 serves as a second heat exchange cavity. The second heat exchange cavity is connected to the first heat exchange cavity on one hand and to the energy-saving device 23 through the exhaust port on the other hand. The upper end of all the second finned tubes I8 is connected to the upper boiler drum, and the lower end of all the second finned tubes I8 is connected to the lower boiler drum.

[0073] The principle of this embodiment is the same as that of Embodiment 1, and will not be repeated here.

[0074] Example 3

[0075] like Figures 15 to 17 As shown, a biomass steam generator includes an outer shell 24, inside which are a heat exchange mechanism and an energy saver 23. The main steam valve seat 1 on the heat exchange mechanism is connected to the steam outlet, and the exhaust port of the heat exchange mechanism is connected to the energy saver 23. Below the heat exchange mechanism is a combustion chamber formed by stacked furnace walls 28. The bottom of the combustion chamber is provided with a chain grate 29. A feeding mechanism 27 for conveying biomass is provided on one side of the combustion chamber. The flame and flue gas generated when the biomass is burned in the combustion chamber enter the heat exchange mechanism for heat exchange. The heat exchange mechanism includes an upper drum and a lower drum arranged vertically. The upper drum is connected to the main steam valve seat 1, and the lower drum is connected to the water supply pipe seat 17. Both the upper drum and the lower drum are closed ring-shaped cavities. The upper drum and the lower drum are connected by a plurality of vertically arranged first finned tubes 10. All the first finned tubes 10 are arranged in a ring shape, and the cylindrical inner cavity formed by all the first finned tubes 10 serves as the first heat exchange cavity.

[0076] A first folded chimney 21 covers the outside of all the first finned tubes 10 arranged in a ring shape. Multiple second finned tubes I8 are provided on the outside of the first folded chimney 21. All the second finned tubes I8 are arranged along the first folded chimney 21 in a single or multiple ring shape. A second folded chimney 22 covers the outside of the second finned tubes I8 arranged in a ring shape. The ring-shaped cavity formed between the first folded chimney 21 and the second folded chimney 22 serves as a second heat exchange cavity. The second heat exchange cavity is connected to the first heat exchange cavity. The second heat exchange cavity is connected to the energy-saving device 23 through the exhaust port. The upper end of all the second finned tubes I8 is connected to the upper boiler drum, and the lower end of all the second finned tubes I8 is connected to the lower boiler drum.

[0077] Multiple second finned tubes II9 are provided inside all the first finned tubes 10 arranged in a ring shape. All the second finned tubes II9 are arranged in a single layer or multiple layers in a ring shape. The upper end of all the second finned tubes II9 is ​​connected to the upper drum through a bend 5, and the lower end of all the second finned tubes II9 is ​​connected to the lower drum through a bend 5.

[0078] like Figure 18 and Figure 21 As shown, the energy-saving device 23 has a cavity-like interior divided into upper and lower parts. A water pipe 23-5 runs through the upper cavity, carrying water. One end of the water pipe 23-5 is a cold water inlet 23-1, connected to an external water tank. The other end of the water pipe 23-5 is a hot water outlet 23-2, connected to a water supply pipe seat 17. An air pipe 23-6 runs through the lower cavity, carrying air. One end of the air pipe 23-6 is a cold air inlet 23-3, connected to external air. The other end of the air pipe 23-6 is a hot air outlet 23-4, connected to the combustion chamber. The internal cavity of the energy-saving device 23 is connected to the exhaust port of the heat exchange mechanism.

[0079] like Figure 22 As shown, biomass is burned in an independent combustion chamber. The combustion chamber is equipped with a feeding mechanism 27 and a grate. Flames and flue gas enter the first heat exchange chamber from the bottom. High-temperature flue gas enters the first heat exchange chamber upwards, scouring the inner side of the first finned tube 10 and the second finned tube II 9. The flue gas is deflected back to the second heat exchange chamber by the first folding flue 21 and flows downwards to scouring the outer side of the second finned tube I 8. After the exhaust gas enters the economizer 23, the water pipe 23-5 preheats the cold water, the hot water returns to the water supply pipe seat 17 and enters the lower drum, the gas pipe 23-6 preheats the air, and the hot air outlet 23-4 sends it back to the combustion chamber to aid combustion.

[0080] like Figure 23 As shown, water enters the lower boiler drum through the water supply pipe seat 17, then rises to the first finned tube 10 and the second finned tube I8, vaporizes after being heated and flows into the upper boiler drum, and is discharged as steam through the main steam valve seat 1.

[0081] Example 4

[0082] like Figure 24 The biomass steam generator shown has a reciprocating grate 30 at the bottom of the combustion chamber. The rest of the structure is the same as the biomass steam generator provided in Example 3. The flue gas flow direction and the steam-water flow direction are also the same, so they will not be described again here.

[0083] Example 5

[0084] like Figure 25The biomass steam generator shown has a fixed grate 31 at the bottom of the combustion chamber. The rest of the structure is the same as the biomass steam generator provided in Embodiment 3. The flue gas flow direction and the steam-water flow direction are also the same, so they will not be described again here.

[0085] Example 6

[0086] like Figure 29 and 30 The biomass steam generator shown includes an outer shell 24, inside which are a heat exchange mechanism and an energy saver 23. The main steam valve seat 1 on the heat exchange mechanism is connected to the steam outlet, and the exhaust port of the heat exchange mechanism is connected to the energy saver 23. Below the heat exchange mechanism is a combustion chamber formed by stacked furnace walls 28. The bottom of the combustion chamber is equipped with a chain grate 29. A feeding mechanism 27 for conveying biomass is provided on one side of the combustion chamber. The flame and flue gas generated when the biomass is burned in the combustion chamber enter the heat exchange mechanism for heat exchange. The heat exchange mechanism includes an upper drum and a lower drum arranged vertically. The upper drum is connected to the main steam valve seat 1, and the lower drum is connected to the water supply pipe seat 17. Both the upper drum and the lower drum are closed ring-shaped cavities. The upper drum and the lower drum are connected by a plurality of vertically arranged first finned tubes 10. All the first finned tubes 10 are arranged in a ring shape, and the cylindrical inner cavity formed by all the first finned tubes 10 serves as the first heat exchange cavity.

[0087] A first folded chimney 21 is covered on the outside of all the first finned tubes 10 arranged in a ring shape. A spirally rising coil 32 is wound around the outside of the first folded chimney 21. A second folded chimney 22 is covered on the outside of the spiral coil 32. The ring-shaped cavity formed between the first folded chimney 21 and the second folded chimney 22 serves as the second heat exchange cavity. The second heat exchange cavity is connected to the first heat exchange cavity. The second heat exchange cavity is connected to the energy-saving device 23 through the exhaust port.

[0088] Multiple second finned tubes II9 are provided inside all the first finned tubes 10 arranged in a ring shape. All the second finned tubes II9 are arranged in a single layer or multiple layers in a ring shape. The upper end of all the second finned tubes II9 is ​​connected to the upper drum through a bend 5, and the lower end of all the second finned tubes II9 is ​​connected to the lower drum through a bend 5.

[0089] The energy-saving device 23 has a cavity-like interior, with water pipes 23-5 arranged inside. Water flows through the water pipes 23-5. The internal cavity of the energy-saving device 23 is connected to the exhaust port of the heat exchange mechanism. The high-temperature flue gas discharged from the exhaust port exchanges heat with the water inside the water pipes 23-5. The hot water inside the water pipes 23-5 returns to the water supply pipe seat 17 and enters the lower boiler drum.

[0090] Biomass is burned in an independent combustion chamber equipped with a feeding mechanism 27 and a grate. Flames and flue gas enter the first heat exchange chamber from the bottom. High-temperature flue gas enters the first heat exchange chamber upwards, scouring the inner side of the first finned tube 10 and the second finned tube II 9. The flue gas is deflected back to the second heat exchange chamber by the first folding chimney 21 and flows downwards to scour the coil 32. The main steam valve seat 1 of the upper boiler drum is connected to the bottom port of the coil 32 through a steam conduit 33. The top port of the coil 32 is connected to the steam outlet to generate superheated steam.

[0091] Superheated steam generation process: The hot water provided by the economizer 23 enters the lower boiler drum through the water supply pipe seat 17, and then rises to the first finned tube 10. After being heated, it vaporizes and flows into the upper boiler drum. The generated steam is discharged through the main steam valve seat 1, steam pipe 33 and coil 32, and finally forms superheated steam.

[0092] Example 7

[0093] like Figure 31 The illustrated fuel-fired steam generator includes an outer shell 24, inside which are a heat exchange mechanism and an economizer 23. The main steam valve seat 1 on the heat exchange mechanism is connected to the steam outlet, and the exhaust port of the heat exchange mechanism is connected to the economizer 23. A burner 25 is installed on the top of the outer shell 24, and the burner 25 is connected to the first heat exchange chamber through a burner interface. The fuel-fired gas enters the heat exchange mechanism from below for combustion and heat exchange. The heat exchange mechanism includes an upper drum and a lower drum arranged vertically. The upper drum is connected to the main steam valve seat 1, and the lower drum is connected to the water supply pipe seat 17. Both the upper drum and the lower drum are closed ring-shaped cavities. The upper drum and the lower drum are connected by a plurality of vertically arranged first finned tubes 10. All the first finned tubes 10 are arranged in a ring shape, and the cylindrical inner cavity formed by all the first finned tubes 10 serves as the first heat exchange chamber.

[0094] A first folded chimney 21 is covered on the outside of all the first finned tubes 10 arranged in a ring shape. A spirally rising coil 32 is wound around the outside of the first folded chimney 21. A second folded chimney 22 is covered on the outside of the spiral coil 32. The ring-shaped cavity formed between the first folded chimney 21 and the second folded chimney 22 serves as the second heat exchange cavity. The second heat exchange cavity is connected to the first heat exchange cavity on one hand and to the energy-saving device 23 through the exhaust port on the other hand.

[0095] Multiple second finned tubes II9 are provided inside all the first finned tubes 10 arranged in a ring shape. All the second finned tubes II9 are arranged in a single layer or multiple layers in a ring shape. The upper end of all the second finned tubes II9 is ​​connected to the upper drum through a bend 5, and the lower end of all the second finned tubes II9 is ​​connected to the lower drum through a bend 5.

[0096] The energy-saving device 23 has a cavity-like interior, with water pipes 23-5 arranged inside. Water flows through the water pipes 23-5. The internal cavity of the energy-saving device 23 is connected to the exhaust port of the heat exchange mechanism. The high-temperature flue gas discharged from the exhaust port exchanges heat with the water inside the water pipes 23-5. The hot water inside the water pipes 23-5 returns to the water supply pipe seat 17 and enters the lower boiler drum.

[0097] Fuel gas is injected directly into the first heat exchange chamber from below, where it burns to produce high-temperature flue gas. This high-temperature flue gas flows upwards within the first heat exchange chamber, washing over the inner sides of the first finned tube 10 and the second finned tube II 9. Heat is transferred through the tube walls to the water inside the tubes, heating the water and generating steam. After rising to the top, the flue gas is blocked and deflected by the first deflector 21, entering the second heat exchange chamber. The flue gas then flows downwards within the annular chamber, washing over the outer coil 32, undergoing another heat exchange. The cooled flue gas enters the energy-saving device 23 from the exhaust port at the bottom of the second heat exchange chamber. The main steam valve seat 1 of the upper boiler drum is connected to the bottom port of the coil 32 via a steam conduit 33, and the top port of the coil 32 is connected to the steam outlet to generate superheated steam.

[0098] Superheated steam generation process: The hot water provided by the economizer 23 enters the lower boiler drum through the water supply pipe seat 17, and then rises to the first finned tube 10. After being heated, it vaporizes and flows into the upper boiler drum. The generated steam is discharged through the main steam valve seat 1, steam pipe 33 and coil 32, and finally forms superheated steam.

[0099] Example 8

[0100] like Figure 32 The fuel oil / gas steam generator shown uses the same heat exchange mechanism, steam-water flow, and flue gas flow as in Embodiment 7. However, in this embodiment, a heat source 34 other than fuel oil / gas or biomass combustion is used. The other heat source 34 can be flames or flue gas generated by any other fuel.

[0101] The eight embodiments provided by this utility model mainly involve the following steps in the heat exchange process:

[0102] 1. Flue Gas Flow and Heat Exchange: The high-temperature flue gas generated after the combustion of fuel oil, gas, or biomass first enters the first heat exchange chamber, where it exchanges heat with all the first finned tubes 10 and the second finned tubes II 9, achieving the first flue gas return. At this time, the flue gas transfers heat to the water in the first finned tubes 10 and the second finned tubes II 9, causing the water temperature to gradually rise. Subsequently, the flue gas passes through the first folding chimney 21 and enters the second heat exchange chamber formed between the first folding chimney 21 and the second folding chimney 22, achieving the second flue gas return, and continues to exchange heat with the water in the second finned tube I 8. The annular arrangement of all finned tubes increases the heat exchange area and improves the heat exchange efficiency.

[0103] 2. Thermal efficiency and energy utilization: The design of the heat exchange structure, combined with the design of the first and second flue gas return paths, ensures sufficient heat exchange of the flue gas in the steam generator, thereby improving thermal efficiency. At the same time, by reducing water volume and optimizing the finned tube structure, energy consumption and manufacturing costs are further reduced.

[0104] In summary, this embodiment ensures the efficient and stable operation of the steam generator through reasonable connection design and optimized workflow.

Claims

1. A heat exchange mechanism for installation within a steam generator, comprising an upper drum and a lower drum arranged vertically, wherein, The upper boiler drum is connected to the main steam valve seat (1), and the lower boiler drum is connected to the water supply pipe seat (17). The upper boiler drum and the lower boiler drum are both closed ring-shaped cavities. The upper boiler drum and the lower boiler drum are connected by a plurality of vertically arranged first finned tubes (10). All the first finned tubes (10) are arranged in a ring shape. The cylindrical inner cavity formed by all the first finned tubes (10) serves as the first heat exchange cavity. The bottom or top of the first heat exchange cavity is connected or communicated with a heat source through an interface.

2. The heat exchange mechanism as described in claim 1, characterized in that: A first folding chimney (21) covers the outside of all the first finned tubes (10) arranged in a ring shape, and multiple second finned tubes I are provided on the outside of the first folding chimney (21). (8) All the second finned tubes I (8) are arranged along the first folded chimney (21) and are in a single or multi-layer ring shape. A second folded chimney (22) covers the outside of the second finned tubes I (8) arranged in a ring shape. The ring-shaped cavity formed between the first folded chimney (21) and the second folded chimney (22) serves as the second heat exchange cavity. The second heat exchange cavity is connected to the first heat exchange cavity. The upper end of all the second finned tubes I (8) is connected to the upper boiler drum. (8) The lower end is connected to the lower drum.

3. A heat exchange mechanism as described in claim 1 or 2, characterized in that: Multiple second finned tubes II (9) are provided inside all the first finned tubes (10) arranged in a ring shape. All the second finned tubes II (9) are arranged in a single layer or multiple layers of ring shape. The upper end of all the second finned tubes II (9) is connected to the upper drum through a bend (5), and the lower end of all the second finned tubes II (9) is connected to the lower drum through a bend (5).

4. A heat exchange mechanism as described in claim 3, characterized in that: A spirally rising coil (32) is provided in the first or second heat exchange chamber. When the main steam valve seat (1) of the upper boiler is connected to the bottom port of the coil (32) through the steam pipe (33), superheated steam is discharged from the top port of the coil (32). When the coil (32) is connected to the lower boiler through the water supply pipe seat (17), it is used to preheat the water that is about to enter the lower boiler.

5. A heat exchange mechanism as described in claim 1, characterized in that: The upper pot drum is composed of an outer upper pot drum body (2), an inner upper pot drum body (7), an upper upper pot drum tube plate (6), and a universal upper pot drum tube plate (4); correspondingly, the lower pot drum is composed of an outer lower pot drum body (11), an inner lower pot drum body (12), a universal lower pot drum tube plate (14), and a lower lower pot drum tube plate (13).

6. A fuel oil / gas gas steam generator, comprising a housing (24), wherein a heat exchange mechanism and an economizer (23) are provided inside the housing (24), a main steam valve seat (1) on the heat exchange mechanism is connected to a steam outlet, and the exhaust port of the heat exchange mechanism is connected to the economizer (23), characterized in that: A burner (25) is installed at the top or bottom of the outer shell (24). Fuel gas enters the heat exchange mechanism from the top or from the bottom and is burned and heat exchanged. The heat exchange mechanism includes an upper drum and a lower drum arranged vertically. The upper drum is connected to the main steam valve seat (1), and the lower drum is connected to the water supply pipe seat (17). Both the upper drum and the lower drum are closed ring-shaped cavities. The upper drum and the lower drum are connected by a plurality of vertically arranged first finned tubes (10). All the first finned tubes (10) are arranged in a ring shape. The cylindrical inner cavity formed by all the first finned tubes (10) serves as the first heat exchange cavity.

7. A fuel oil / gas gas steam generator according to claim 6, characterized in that: A first folded chimney (21) covers the outside of all the first finned tubes (10) arranged in a ring shape. Multiple second finned tubes (I) (8) are provided on the outside of the first folded chimney (21). All the second finned tubes (I) (8) are arranged along the first folded chimney (21) and are in a single or multiple ring shape. A second folded chimney (22) covers the outside of the second finned tubes (I) (8) arranged in a ring shape. The ring-shaped cavity formed between the first folded chimney (21) and the second folded chimney (22) serves as the second heat exchange cavity. The second heat exchange cavity is connected to the first heat exchange cavity on one hand and to the energy saver (23) through the exhaust port on the other hand. The upper end of all the second finned tubes (I) (8) is connected to the upper boiler drum, and the lower end of all the second finned tubes (I) (8) is connected to the lower boiler drum.

8. A fuel oil / gas gas steam generator according to claim 7, characterized in that: A spirally rising coil (32) is provided in the first or second heat exchange chamber. When the main steam valve seat (1) of the upper boiler is connected to the bottom port of the coil (32) through the steam pipe (33), superheated steam is discharged from the top port of the coil (32). When the coil (32) is connected to the lower boiler through the water supply pipe seat (17), it is used to preheat the water that is about to enter the lower boiler.

9. A biomass steam generator, comprising an outer shell (24), wherein a heat exchange mechanism and an energy-saving device (23) are provided inside the outer shell (24), a main steam valve seat (1) on the heat exchange mechanism is connected to a steam outlet, and the exhaust port of the heat exchange mechanism is connected to the energy-saving device (23). A combustion chamber formed by furnace walls (28) is provided below the heat exchange mechanism, a grate is provided at the bottom of the combustion chamber, and a feeding mechanism (27) for conveying biomass is provided on one side of the combustion chamber. The flame and flue gas generated when the biomass is burned in the combustion chamber enter the heat exchange mechanism for heat exchange, characterized in that: The heat exchange mechanism includes an upper boiler drum and a lower boiler drum arranged vertically. The upper boiler drum is connected to the main steam valve seat (1), and the lower boiler drum is connected to the water supply pipe seat (17). Both the upper boiler drum and the lower boiler drum are closed ring-shaped cavities. The upper boiler drum and the lower boiler drum are connected by a plurality of vertically arranged first finned tubes (10). All the first finned tubes (10) are arranged in a ring shape, and the cylindrical inner cavity formed by all the first finned tubes (10) serves as the first heat exchange cavity.

10. A biomass steam generator according to claim 9, characterized in that: A first folded chimney (21) covers the outside of all the first finned tubes (10) arranged in a ring shape. Multiple second finned tubes (I) (8) are provided on the outside of the first folded chimney (21). All the second finned tubes (I) (8) are arranged along the first folded chimney (21) and are in a single or multiple ring shape. A second folded chimney (22) covers the outside of the second finned tubes (I) (8) arranged in a ring shape. The ring-shaped cavity formed between the first folded chimney (21) and the second folded chimney (22) serves as the second heat exchange cavity. The second heat exchange cavity is connected to the first heat exchange cavity. The second heat exchange cavity is connected to the energy saver (23) through the exhaust port. The upper end of all the second finned tubes (I) (8) is connected to the upper boiler drum, and the lower end of all the second finned tubes (I) (8) is connected to the lower boiler drum.

11. A biomass steam generator according to claim 10, characterized in that: A spirally rising coil (32) is provided in the first or second heat exchange chamber. When the main steam valve seat (1) of the upper boiler is connected to the bottom port of the coil (32) through the steam pipe (33), superheated steam is discharged from the top port of the coil (32). When the coil (32) is connected to the lower boiler through the water supply pipe seat (17), it is used to preheat the water that is about to enter the lower boiler.

12. A biomass steam generator according to claim 9, characterized in that: Multiple second finned tubes II (9) are provided inside all the first finned tubes (10) arranged in a ring shape. All the second finned tubes II (9) are arranged in a single layer or multiple layers of ring shape. The upper end of all the second finned tubes II (9) is connected to the upper drum through a bend (5), and the lower end of all the second finned tubes II (9) is connected to the lower drum through a bend (5).

13. A biomass steam generator according to claim 9, characterized in that: The energy-saving device (23) has a cavity-like interior divided into upper and lower parts. A water pipe (23-5) is arranged inside the upper cavity, through which water flows. One end of the water pipe (23-5) is a cold water inlet (23-1), which is connected to an external water tank. The other end of the water pipe (23-5) is a hot water outlet (23-2), which is connected to a water supply pipe seat (17). The lower cavity is equipped with an air pipe (23-6) that runs through it. Air flows through the air pipe (23-6). One end of the air pipe (23-6) is a cold air inlet (23-3) that is connected to the outside air. The other end of the air pipe (23-6) is a hot air outlet (23-4) that is connected to the combustion chamber. The internal cavity of the energy-saving device (23) is connected to the exhaust port of the heat exchange mechanism.

Images