Tubular steam generator system

Abstract

The invention discloses a tubular steam generator system, and belongs to the technical field of tubular steam generators, the tubular steam generator system comprises a fan, a mixing pipe, a fuel pump, a combustion box, a heat exchange box, a condensation box and a smoke exhaust pipe, the combustion box and the condensation box are fixedly connected to the left end and the right end of the heat exchange box respectively to form a sealing cavity; one end of the mixing pipe is fixedly connected to the combustion box, the mixing pipe is communicated with the combustion box, and the fan is fixedly connected to the other end of the mixing pipe; fuel and air are fed into the mixing pipe to be premixed through the fan and the fuel pump, mixed gas enters the combustion chamber to be combusted, water which enters the water feeding box and is heated, vaporized and discharged for three times is heated, vaporized and discharged, the water is fully preheated and vaporized, the layering phenomenon is avoided, dry burning of the upper portion of a pipe bundle and liquid accumulation of the lower portion of the pipe bundle are avoided, and the energy consumption is reduced. The heat transfer efficiency is greatly improved, and the risks of corrosion and fatigue cracking of the tube bundle are reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of once-through steam generators, and particularly relates to a once-through steam generator system. Background Technology

[0002] A cross-flow steam generator is a device in which the heat carrier and water flow in the same channel, and steam is generated by heating the water through heat transfer. Its working principle is as follows: Cold water first passes through a condenser to absorb waste heat from the furnace and flue gas for initial preheating. Then, it enters the lower header of the furnace body, where it absorbs heat from the high-temperature flue gas generated by fuel combustion in the combustion chamber through finned tubes. The water is rapidly heated and vaporized into steam within the finned tubes. The steam and water mixture enters the upper header, where it is filtered using cross-flow technology to achieve water-vapor separation. The filtered saturated steam is output for user use, while the filtered water flows back to the lower header through the cross-flow pipes to continue participating in the heat cycle. Chinese patent (CN202310648188.X) discloses a steam regulation structure for a fully premixed combustion cross-flow steam generator, including an outer mounting shell and a preheating tank. A connecting seat is fixedly installed inside the outer mounting shell, and multiple heat exchange units are fixedly installed on the upper surface of the connecting seat. An upper connecting pipe is fixedly installed at the upper end of each heat exchange unit. A gas-liquid separation component is installed inside the upper connecting pipe, and the gas-liquid separation filtration rate can be adjusted. A gas-liquid separator is installed above the upper connecting pipe and is fixedly installed at the upper end of the outer mounting shell. An inner partition is fixedly installed on one side of the gas-liquid separator, and an upper top plate is fixedly installed inside the inner partition. An upper exhaust pipe is fixedly installed on the upper top plate, and an upper inlet pipe is fixedly installed at the upper end of the upper exhaust pipe. The lower end of the upper inlet pipe is fixedly connected to the preheating tank. A water storage tank is fixedly installed inside the preheating tank, and an exhaust component is installed on one side of the preheating tank. Chinese Patent (CN202420854179.6) discloses a novel once-through steam generator, relating to the field of steam generator technology, including a boiler body, a condenser, and a feedwater pump, wherein the condenser is located on the left side of the boiler body. Currently, under low-load conditions, the vertical burner structure design is prone to stratification of the water-steam two-phase flow inside the tubes, with the upper part being hot and the lower part cold, and the upper part being steam and the lower part being water. This leads to dry burning in the upper part of the tube bundle and liquid accumulation in the lower part, which not only affects the heat transfer efficiency but also increases the risk of tube bundle corrosion and fatigue cracking. In addition, the vertical burner structure design is not convenient for modular integration with other equipment. Summary of the Invention

[0003] The purpose of this invention is to provide a once-through steam generator system in order to solve the problems mentioned above. To achieve the above objectives, the present invention adopts the following technical solution: a once-through steam generator system, comprising a blower, a mixing pipe, a fuel pump, a combustion chamber, a heat exchange chamber, a condenser chamber, and a flue pipe. The combustion chamber and the condenser chamber are respectively fixedly connected to the left and right ends of the heat exchange chamber to form sealed cavities. One end of the mixing pipe is fixedly connected to the combustion chamber and is connected to the combustion chamber. The blower is fixedly connected to the other end of the mixing pipe. The fuel pump is connected to the mixing pipe through a pipeline. The flue pipe is fixedly connected to the condenser chamber and is connected to the condenser chamber. The combustion chamber is equipped with a preheating water collection box at both the top and bottom. The preheating water collection box at the bottom is equipped with a first water inlet, and the preheating water collection box at the top is equipped with a first water outlet. Multiple first finned tubes are located inside the combustion chamber, and the opposite ends of the multiple first finned tubes are respectively connected to two preheating water collection boxes. The condenser box is provided with a water inlet box and a water outlet box. The water inlet box is provided with a second water inlet, which is connected to the first water outlet. The water outlet box is provided with a second water outlet. Multiple second finned tubes are located inside the condensation box, and the water inlet box is connected to the water outlet box through the multiple second finned tubes; The heat exchange box is provided with an upper water box and a lower water box at the top and bottom respectively. The upper water box is provided with a steam outlet, and the lower water box is provided with a third water inlet, which is connected to the second water outlet. Multiple third finned tubes are located inside the heat exchange box, and the opposite ends of the multiple third finned tubes are respectively connected to the upper water box and the lower water box; A superheating coil is located inside the heat exchange box and between multiple third finned tubes and the combustion box. One end of the superheating coil extends into the upper water box, and the other end of the superheating coil extends through the upper water box into the steam outlet. The ignition needle is fixedly connected to the heat exchange box. As a further description of the above technical solution: The combustion chamber is equipped with a gas flow equalization plate, which is located between the multiple first finned tubes and the mixing tube. As a further description of the above technical solution: The combustion chamber is equipped with multiple triangular tubes, and the multiple first finned tubes are evenly arranged at equal distances along a straight line. The opposite ends of the triangular tubes are respectively connected to two preheating water collection boxes, and the triangular tubes are inserted between two adjacent first finned tubes. As a further description of the above technical solution: Multiple second finned tubes are arranged in a row. The condenser box is equipped with multiple condensate collection boxes. Some of the condensate collection boxes are fixedly connected to the bottom of the condenser box and located between the inlet box and the outlet box. Other condensate collection boxes are fixedly connected to the top of the condenser box. The condensate collection boxes cover the ends of two adjacent rows of second finned tubes. The two condensate collection boxes located at the top and bottom of the condenser box cover at most the opposite ends of the same row of second finned tubes. The adjacent rows of second finned tubes are staggered. As a further description of the above technical solution: Two rows of return water pipes are located inside the heat exchange box, and the opposite ends of the return water pipes are respectively connected to the upper water box and the lower water box. As a further description of the above technical solution: The drain box is equipped with a sewage outlet. As a further description of the above technical solution: The water inlet box is equipped with a first baffle, which covers the end of the superheated coil. As a further description of the above technical solution: A second shroud is provided inside the mixing pipe, and a turbulence chamber is formed between the second shroud and the inner wall of the mixing pipe. The fuel pump is connected to the turbulence chamber. As a further description of the above technical solution: The heat exchange box is equipped with an observation port. As a further description of the above technical solution: The heat exchange box is equipped with a flame sensor. In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In this invention, fuel and air are premixed in a mixing tube by a fan and a fuel pump. The mixed gas enters the combustion chamber for combustion. The hot flue gas from the combustion enters the condensation chamber from the heat exchange box and is discharged from the exhaust pipe. After heat exchange in the combustion chamber, the first finned tube preheats the water in the preheating water collection box. After heat exchange with the waste heat of the flue gas in the condensation box, the second finned tube preheats the water that has been preheated through the inlet and outlet water boxes. After heat exchange in the heat exchange box, the third finned tube heats the water that has been preheated twice through the upper and lower water boxes. After heat exchange in the heat exchange box, the superheated coil heats and vaporizes the water that has been preheated three times from the upper water box and discharges it. This ensures that the water is fully preheated and fully vaporized, avoiding stratification and preventing dry burning at the top and liquid accumulation at the bottom of the tube bundle. This greatly improves the heat transfer efficiency and reduces the risk of tube bundle corrosion and fatigue cracking. 2. In this invention, the horizontal structure design makes the entire steam generator compact, which facilitates modular and unit-based integration with other equipment. Attached Figure Description

[0004] Figure 1 A schematic diagram of the overall structure of a once-through steam generator system. Figure 1 . Figure 2 A schematic diagram of the overall structure of a once-through steam generator system. Figure 2 . Figure 3 Explosion of a once-through steam generator system Figure 1 . Figure 4 Explosion of a once-through steam generator system Figure 2 . Figure 5 A cross-sectional view of a once-through steam generator system Figure 1 . Figure 6 A cross-sectional view of a once-through steam generator system Figure 2 . Figure 7 A cross-sectional view of a once-through steam generator system Figure 3 . Figure 8 A cross-sectional view of a once-through steam generator system Figure 4 . Figure 9 A cross-sectional view of a once-through steam generator system Figure 5 . Figure 10 A cross-sectional view of a once-through steam generator system Figure 6 . Legend: 1. Fan; 2. Mixing pipe; 3. Fuel pump; 4. Combustion box; 5. Heat exchange box; 6. Condensation box; 7. Exhaust pipe; 8. Preheating water collection box; 9. First water inlet; 10. First water outlet; 11. First finned tube; 12. Water inlet box; 13. Water outlet box; 14. Second water inlet; 15. Second water outlet; 16. Second finned tube; 17. Upper water box; 18. Lower water box; 19. Steam outlet; 20. Third water inlet; 21. Third finned tube; 22. Superheating coil; 23. Ignition needle; 24. Gas flow equalization plate; 25. Triangular tube; 26. Condensation water collection box; 27. Return water pipe; 28. Drain outlet; 29. ​​First baffle; 30. Second baffle; 31. Baffle chamber; 32. Observation port; 33. Flame sensor. Detailed Implementation

[0005] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Please see Figure 1-10 This invention provides a technical solution: a cross-flow steam generator system, comprising a blower 1, a mixing pipe 2, a fuel pump 3, a combustion chamber 4, a heat exchange chamber 5, a condenser chamber 6, and a flue pipe 7. The combustion chamber 4 and the condenser chamber 6 are respectively fixedly connected to the left and right ends of the heat exchange chamber 5 to form sealed cavities. One end of the mixing pipe 2 is fixedly connected to the combustion chamber 4 and the mixing pipe 2 communicates with the combustion chamber 4. The blower 1 is fixedly connected to the other end of the mixing pipe 2. The fuel pump 3 is connected to the mixing pipe 2 through a pipe. The flue pipe 7 is fixedly connected to the condenser chamber 6 and the flue pipe 7 communicates with the condenser chamber 6. The combustion chamber 4 is provided with a preheating water collection box 8 at both the top and bottom. The preheating water collection box 8 located at the bottom is provided with a first water inlet 9, and the preheating water collection box 8 located at the top is provided with a first water outlet 10. Multiple first finned tubes 11 are located inside the combustion chamber 4, and the opposite ends of the multiple first finned tubes 11 are respectively connected to two preheating water collection boxes 8. The condenser box 6 is provided with a water inlet box 12 and a water outlet box 13. The water inlet box 12 is provided with a second water inlet 14, which is connected to the first water outlet 10. The water outlet box 13 is provided with a second water outlet 15. Multiple second finned tubes 16 are located inside the condenser box 6, and the water inlet box 12 is connected to the water outlet box 13 through the multiple second finned tubes 16; The heat exchange box 5 is provided with an upper water box 17 and a lower water box 18 at the top and bottom respectively. The upper water box 17 is provided with a steam outlet 19, and the lower water box 18 is provided with a third water inlet 20. The third water inlet 20 is connected to the second water outlet 15. Multiple third finned tubes 21 are located inside the heat exchange box 5, and the opposite ends of the multiple third finned tubes 21 are respectively connected to the upper water box 17 and the lower water box 18. The superheating coil 22 is located inside the heat exchange box 5 and is located between the multiple third finned tubes 21 and the combustion box 4. One end of the superheating coil 22 extends into the upper water box 17 and the other end of the superheating coil 22 extends through the upper water box 17 into the steam outlet 19. Ignition needle 23 is fixedly connected to the heat exchange box 5; The combustion chamber 4 is provided with a gas flow equalization plate 24, which is located between the multiple first finned tubes 11 and the mixing tube 2. The combustion chamber 4 is provided with multiple triangular tubes 25, and multiple first finned tubes 11 are arranged evenly at equal distances along a straight line. The two ends of the triangular tubes 25 are respectively connected to the two preheating water collection boxes 8, and the triangular tubes 25 are inserted between two adjacent first finned tubes 11. Multiple second finned tubes 16 are arranged in rows. The condenser box 6 is equipped with multiple condensate collection boxes 26. A portion of the condensate collection boxes 26 are fixedly connected to the bottom of the condenser box 6 and located between the inlet box 12 and the outlet box 13. Another portion of the condensate collection boxes 26 are fixedly connected to the top of the condenser box 6. The condensate collection boxes 26 cover the ends of two adjacent rows of second finned tubes 16. The two condensate collection boxes 26 located at the top and bottom of the condenser box 6 cover at most the opposite ends of the same row of second finned tubes 16. Adjacent rows of second finned tubes 16 are staggered. Two rows of return water pipes 27 are located inside the heat exchange box 5, and the opposite ends of the return water pipes 27 are respectively connected to the upper water box 17 and the lower water box 18; The drain box 18 is provided with a drain outlet 28; The water box 17 is provided with a first baffle 29, which covers the end of the superheated coil 22. A second baffle 30 is provided inside the mixing pipe 2, and a baffle chamber 31 is formed between the second baffle 30 and the inner wall of the mixing pipe 2. The fuel pump 3 is connected to the baffle chamber 31 to facilitate uniform mixing of gas and air. The heat exchange box 5 is provided with an observation port 32 to facilitate observation of the flame combustion inside the heat exchange box 5. The heat exchange box 5 is equipped with a flame sensor 33, which can detect the combustion temperature inside the heat exchange box 5. Working principle: First, the combustion and emission process of the flue gas is as follows: Fan 1 supplies air into mixing pipe 2, and fuel pump 3 supplies fuel gas into mixing pipe 2. The fuel gas enters the turbulence chamber 31. The second turbulence hood 30 is a mesh pipe. The fuel gas enters the mixing pipe 2 evenly through multiple holes in the second turbulence hood 30 and mixes with the air. The mixed gas enters the interior of the combustion chamber 4 and is guided by the gas flow equalization plate 24. The gas flow equalization plate 24 is a mesh plate. The mixed gas is evenly distributed in the combustion chamber 4 through multiple holes in the gas flow equalization plate 24. After ignition by ignition needle 23, the mixture... The gas begins to burn, and the hot flue gas from the combustion passes through heat exchange box 5 and condenser box 6 for heat exchange before being discharged from exhaust pipe 7. Next, the initial heat exchange process for the water is as follows: water enters the preheating water collection box 8 located below from the first inlet 9 and flows into multiple first finned tubes 11 before entering the preheating water collection box 8 located above. During this process, the first finned tubes 11 are subjected to heat exchange by the combustion flame, thus preheating the water passing through them. The preheated water is discharged from the first outlet 10 and enters the inlet water collection box from the second inlet 14. Inside box 12, the secondary heat exchange process of the water is as follows: water in inlet box 12 enters condensate collection box 26 through single-row second finned tubes 16, and water between condensate collection boxes 26 is also transported through single-row second finned tubes 16 until the water in single-row second finned tubes 16 flows into outlet box 13. During this process, the second finned tubes 16 exchange heat with the waste heat of the flue gas, causing the water passing through them to be reheated. The reheated water is discharged from the second outlet 15 and enters the lower water box 18 through the third inlet 20. Then, the water undergoes a three-stage heat exchange process. The heat exchange process is as follows: water in the lower water box 18 enters the upper water box 17 through multiple third finned tubes 21. During the process, the third finned tubes 21 exchange heat with the hot flue gas, causing the water passing through them to become unsaturated steam. The water in the unsaturated steam entering the upper water box 17 flows back into the lower water box 18 through multiple return water pipes 27 to participate in the next third heat exchange. Finally, the steam enters the superheated coil 22 from the upper water box 17. The superheated coil 22 exchanges heat with the flue gas, causing the steam passing through it to become saturated steam and be discharged from the steam outlet 19. The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A once-through steam generator system, characterized in that: The system includes a fan (1), a mixing pipe (2), a fuel pump (3), a combustion chamber (4), a heat exchange chamber (5), a condenser (6), and an exhaust pipe (7). The combustion chamber (4) and the condenser (6) are fixedly connected to the left and right ends of the heat exchange chamber (5) to form a sealed cavity. One end of the mixing pipe (2) is fixedly connected to the combustion chamber (4) and the mixing pipe (2) is connected to the combustion chamber (4). The fan (1) is fixedly connected to the other end of the mixing pipe (2). The fuel pump (3) is connected to the mixing pipe (2) through a pipe. The exhaust pipe (7) is fixedly connected to the condenser (6) and the exhaust pipe (7) is connected to the condenser (6). The combustion chamber (4) is provided with a preheating water collection box (8) at both the top and bottom. The preheating water collection box (8) located at the bottom is provided with a first water inlet (9), and the preheating water collection box (8) located at the top is provided with a first water outlet (10). Multiple first finned tubes (11) are located inside the combustion chamber (4), and the two ends of the multiple first finned tubes (11) are respectively connected to the two preheating water collection boxes (8). The condenser box (6) is provided with a water inlet box (12) and a water outlet box (13). The water inlet box (12) is provided with a second water inlet (14), which is connected to the first water outlet (10). The water outlet box (13) is provided with a second water outlet (15). Multiple second finned tubes (16) are located inside the condenser box (6), and the water inlet box (12) is connected to the water outlet box (13) through the multiple second finned tubes (16). The heat exchange box (5) is provided with an upper water box (17) and a lower water box (18) at the top and bottom respectively. The upper water box (17) is provided with a steam outlet (19), and the lower water box (18) is provided with a third water inlet (20). The third water inlet (20) is connected to the second water outlet (15). Multiple third finned tubes (21) are located inside the heat exchange box (5), and the opposite ends of the multiple third finned tubes (21) are respectively connected to the upper water box (17) and the lower water box (18). A superheating coil (22) is located inside the heat exchange box (5) and between multiple third finned tubes (21) and the combustion box (4). One end of the superheating coil (22) extends into the upper water box (17) and the other end of the superheating coil (22) extends through the upper water box (17) into the steam outlet (19). Ignition needle (23) is fixedly connected to the heat exchange box (5).

2. The once-through steam generator system according to claim 1, characterized in that, The combustion chamber (4) is provided with a gas flow equalization plate (24), which is located between the multiple first finned tubes (11) and the mixing tube (2).

3. The once-through steam generator system according to claim 1, characterized in that, The combustion chamber (4) is provided with multiple triangular tubes (25), and multiple first finned tubes (11) are arranged evenly at equal distances along a straight line. The two ends of the triangular tubes (25) are respectively connected to the two preheating water collection boxes (8), and the triangular tubes (25) are inserted between two adjacent first finned tubes (11).

4. The once-through steam generator system according to claim 1, characterized in that, Multiple second finned tubes (16) are arranged in a row. Multiple condensate collection boxes (26) are provided on the condenser box (6). One part of the condensate collection boxes (26) is fixedly connected to the bottom of the condenser box (6) and located between the inlet box (12) and the outlet box (13). Another part of the condensate collection boxes (26) is fixedly connected to the top of the condenser box (6). The condensate collection boxes (26) cover the ends of two adjacent rows of second finned tubes (16). The two condensate collection boxes (26) located at the top and bottom of the condenser box (6) cover at most the opposite ends of the same row of second finned tubes (16). The two adjacent rows of second finned tubes (16) are staggered.

5. A once-through steam generator system according to claim 1, characterized in that, Two rows of return water pipes (27) are located inside the heat exchange box (5), and the two ends of the return water pipes (27) are respectively connected to the upper water box (17) and the lower water box (18).

6. A once-through steam generator system according to claim 1, characterized in that, The drain box (18) is provided with a drain outlet (28).

7. A once-through steam generator system according to claim 1, characterized in that, The water box (17) is provided with a first shroud (29), which covers the end of the superheated coil (22).

8. A once-through steam generator system according to claim 1, characterized in that, A second shroud (30) is provided inside the mixing pipe (2), and a turbulence chamber (31) is formed between the second shroud (30) and the inner wall of the mixing pipe (2), and the fuel pump (3) is connected to the turbulence chamber (31).

9. A once-through steam generator system according to claim 1, characterized in that, The heat exchange box (5) is provided with an observation port (32).

10. A once-through steam generator system according to claim 1, characterized in that, The heat exchange box (5) is equipped with a flame sensor (33).

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