A steam generator for oil, gas and electricity

Abstract

This utility model provides a steam generator that can use oil, gas, and electricity as fuels. It employs a furnace enclosed by water-cooled wall tubes connected to an upper and lower header. A pair of convection tube bundles, each connected to the upper and lower headers respectively, are arranged on the left and right sides of the furnace. This creates a first flue gas flow channel and a second flue gas flow channel between the convection tubes, the furnace, and the shell. The flue gas generated by combustion in the furnace undergoes multiple heat exchange cycles within the furnace, the first flue gas flow channel, and the second flue gas flow channel before finally entering the steam collector to heat the wet steam, achieving the required steam dryness and thus achieving efficient utilization of flue gas heat energy. Simultaneously, by installing an electric heating element in the lower header to heat the internal water, this steam generator can simultaneously use oil, electricity, or oil and gas for heating. Compared to a single energy source, it produces steam faster, with higher thermal efficiency and a larger evaporation rate, thereby improving the efficiency of dry steam generation.

Description

Technical Field

[0001] This utility model relates to the field of steam generator technology, specifically a steam generator that can use oil, gas, and electricity as fuels. Background Technology

[0002] A steam generator is a device that uses the heat energy generated by fuel combustion to heat water into high-temperature steam. With the transformation of the global industrial energy structure and the continuous upgrading of environmental regulations, the energy efficiency, emission compliance and operating economy of steam generators, as core heat energy supply units, have become key factors restricting industrial upgrading.

[0003] Existing steam generators mainly include electric, oil, and gas steam generators. All three types are driven by a single energy source. However, because single-energy sources produce steam at a relatively slow rate and have a relatively low evaporation rate, the efficiency of dry steam generation is affected. Furthermore, some energy sources are expensive in certain regions, and some cannot meet local environmental protection requirements. Therefore, single-energy-driven steam generation equipment is no longer sufficient to meet the needs of diverse application scenarios.

[0004] Therefore, it is necessary to provide a steam generator that can produce gas quickly and has high thermal efficiency for use with oil, gas, and electricity. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a steam generator that can use oil, gas, and electricity as fuels, aiming to solve the problems of low combustion efficiency and insufficient heat exchange in existing single-energy steam generators.

[0006] A steam generator for use with oil, gas, and electricity comprises a burner, a housing, a steam generator body disposed within the housing, and a steam collection box connected to the steam generator body. The steam collection box has a steam outlet. The steam generator body includes a hollow furnace chamber with one end connected to the burner, an upper manifold and a lower manifold for water storage, and a pair of convection tube bundles symmetrically arranged on the left and right sides of the furnace chamber. The upper and lower manifolds are located at the upper and lower ends of the furnace chamber, respectively. The convection tube bundles include several convection tubes, with both ends of the tubes connected to the upper manifold, the upper manifold, and the lower manifold. The lower header is connected, and the outer sides of adjacent convection pipes are all interconnected; an electric heating element is installed inside the lower header; the furnace is enclosed by several water-cooled wall pipes symmetrically arranged on the left and right sides of the burner, and the two ends of the water-cooled wall pipes are respectively connected to the upper header and the lower header; two first flue gas channels are symmetrically arranged between the convection pipes and the furnace; two second flue gas channels are symmetrically arranged between the convection pipes and the shell; the end of the first flue gas channel near the burner is connected to the corresponding second flue gas channel, and the upper header and the second flue gas channels are respectively connected to the corresponding flue of the steam collection box.

[0007] Furthermore, the electric heating element includes a plurality of electric heating tubes disposed inside the lower header.

[0008] Furthermore, the steam collection box includes an outer cylinder and an inner cylinder fitted inside the outer cylinder. The outer cylinder has a flue gas chamber connected to the second flue gas flow channel.

[0009] Furthermore, a steam chamber is formed between the inner cylinder and the outer cylinder of the steam collecting box, and the steam chamber is connected to the upper collecting box through a connecting pipe. A spiral flow channel is welded into the steam chamber.

[0010] Furthermore, a flue gas outlet is provided on the side of the outer cylinder of the steam collection box away from the main body of the steam generator, and an energy-saving device is installed on the flue gas outlet.

[0011] Furthermore, adjacent convection tubes are connected by first fins; adjacent water-cooled wall tubes are connected by second fins.

[0012] Furthermore, the steam outlet is equipped with an outlet valve, a safety valve, and a pressure gauge.

[0013] Furthermore, a drain pipe with a valve is installed on the lower header.

[0014] Furthermore, two flue gas turning chambers are symmetrically arranged on both sides of the housing near the burner end, and the first flue gas flow channel is connected to the second flue gas flow channel through the corresponding flue gas turning chamber.

[0015] Furthermore, a heat insulation layer is provided on the shell.

[0016] Furthermore, the furnace is located at the center of one side of the main body of the steam generator, and the steam collection box is located at the top of the main body of the steam generator.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This utility model provides a steam generator that can use oil, gas, and electricity as fuels. It employs a furnace enclosed by water-cooled wall tubes, with both ends of the water-cooled wall tubes connected to an upper and lower header, respectively. A pair of convection tube bundles, each connected to the upper and lower headers, are arranged on the left and right sides outside the furnace. This creates two symmetrically arranged first flue gas channels between the convection tubes and the furnace, and two symmetrically arranged second flue gas channels between the convection tubes and the shell. This allows the flue gas generated by high-temperature combustion in the furnace to undergo multiple heat exchange cycles within the furnace, the first flue gas channels, and the second flue gas channels. Finally, the gas enters the steam collector, further heating the wet steam generated in the upper header and introduced through the connecting pipe. This significantly improves the dryness of the steam, ensuring it meets usage requirements. This enhances heat exchange efficiency while reducing heat waste, achieving highly efficient utilization of flue gas heat energy.

[0019] Meanwhile, by installing electric heating elements on the outside of the lower header to heat the water inside the lower header, the steam generator can use oil, electricity or oil and gas for heating at the same time. Compared with the steam generation speed provided by a single energy source, it has a high thermal efficiency and a large evaporation capacity, thereby significantly improving the efficiency of dry steam generation and thus improving production efficiency.

[0020] In addition, the symmetrical arrangement of the first and second flue gas channels makes the hot flue gas more evenly distributed in the flue, thereby effectively improving the heat energy utilization rate and transfer efficiency. Combined with the symmetrical arrangement of water-cooled wall tubes and convection tube bundles, it can make the heat in the main body of the steam generator evenly transferred, avoiding local overheating or heat efficiency loss, and ensuring the stability and uniformity of the heat exchange process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the main structure of a steam generator that can use oil, gas, and electricity as fuels according to this utility model;

[0022] Figure 2 This is a cross-sectional structural diagram of a steam generator that can use oil, gas, and electricity as described in this utility model;

[0023] Figure 3 This is a schematic diagram of the longitudinal section of a steam generator that can use oil, gas, and electricity as fuels according to this utility model.

[0024] in:

[0025] 1. Burner; 2. Shell; 3. Steam generator body; 31. Furnace; 311. Water-cooled wall tube; 32. Second fin; 33. Upper header; 34. Lower header; 35. Convection tube bundle; 351. Convection tube; 4. Steam collection box; 41. Outer cylinder of steam collection box; 5. First flue gas flow channel; 6. Second flue gas flow channel; 7. Electric heating tube; 8. Flue gas chamber; 9. Steam chamber; 10. Connecting pipe; 11. Exhaust port; 12. First fin; 13. Sewage pipe; 14. Flue gas turning chamber. Detailed Implementation

[0026] The embodiments described below are merely some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0027] See Figure 1 , Figure 2 as well as Figure 3 As shown, this embodiment provides a steam generator that can use oil, gas, and electricity as fuels, including a burner 1, a housing 2, a steam generator body 3 disposed within the housing 2, and a steam collection box 4 connected to the steam generator body 3.

[0028] Specifically, the steam generator body 3 includes a furnace 31, which is hollow inside and connected at one end to the burner 1, so that the combustion port of the burner 1 extends into the furnace 31. The burner 1 can selectively burn oil or gas to provide heat.

[0029] The steam generator body 3 also includes an upper header 33 and a lower header 34 for water storage, and a pair of convection tube bundles 35 symmetrically arranged on the left and right sides of the furnace 31. In this embodiment, the upper header 33 and / or the lower header 34 are provided with water inlets. The furnace 31 is located at the center of one side of the steam generator body 3, and the steam collection box 4 is located on the top of the steam generator body 3.

[0030] The upper header 33 and lower header 34 are located at the upper and lower ends of the furnace 31, respectively. The convection tube bundle 35 includes several convection tubes 351, with both ends of each tube connected to the upper header 33 and lower header 34, and the outer sides of adjacent tubes 351 are interconnected. The upper header 33 is connected to the steam collection box 4. An electric heating element is installed on the outer side of the lower header 33.

[0031] The upper header 33 and lower header 34 are connected by a convection pipe 351 and a water-cooled wall pipe 311. An electric heating element installed on the outside of the lower header 34 heats the water inside. This heat is then transferred through the convection pipe 351 and the water-cooled wall pipe 311, heating the water stored in both the upper and lower headers 33 and generating steam. The steam is then transferred to the steam collector 4 through the upper header 33. The burner 1, with its combustion port extending into the furnace 31, can selectively burn oil or gas to provide heat. This allows the steam generator to simultaneously use oil, electricity, or a combination of both to heat the water stored in the upper and lower headers 33 and generate steam. Compared to single-energy sources, this method produces steam faster, with higher thermal efficiency and a larger evaporation rate, thus improving the efficiency of dry steam generation. Furthermore, it meets environmental protection requirements and the needs of stricter environments, while also catering to users concerned about operating costs. In this embodiment, the electric heating element includes a plurality of electric heating tubes 7 disposed on the outside of the lower header 33.

[0032] refer to Figure 2 and Figure 3 As shown, the furnace 31 is enclosed by a plurality of water-cooled wall tubes 311 symmetrically arranged on the left and right sides of the burner 1, and the two ends of the water-cooled wall tubes 311 are respectively connected to the upper header 33 and the lower header 34. Two first flue gas passages 5 are symmetrically arranged between the convection pipe 351 and the furnace 31; the end of the furnace 31 away from the burner 1 is connected to the first flue gas passage 5; two second flue gas passages 6 are symmetrically arranged between the convection pipe 351 and the shell 31; the end of the first flue gas passage 5 near the burner 1 is connected to the corresponding second flue gas passage 6, and the upper header 33 and the second flue gas passage 6 are respectively connected to the steam collector 4. In this embodiment, two flue gas turning chambers 14 are also symmetrically arranged on both sides of the shell 2 near the burner 1, and the first flue gas passage 5 is connected to the second flue gas passage 6 through the corresponding flue gas turning chamber 14.

[0033] In this embodiment, adjacent convection tubes 251 are connected by first fins 12. The end of the convection tube 251 away from the burner 1 is sealed against the housing 1, and the end near the burner 1 is sealed against the flue gas turning chamber 14. The other sides are sealed by the first fins 12 and the housing 1, preventing flue gas from escaping from the gap between adjacent convection tubes 251. This allows the flue gas to flow according to the preset flue gas flow path, thereby improving the utilization rate of flue gas heat.

[0034] Each adjacent water-cooled wall tube 311 is provided with a second fin 32. The furnace 31, near the burner 1, is sealed to the housing 1 except for the connection port with the burner 1. The other end is not sealed to the housing 1, allowing the furnace 31 to communicate with the first flue gas flow channel 5. The remaining sides are sealed by the second fins 32, preventing the flue gas conducted within the furnace 31 from escaping through the gaps between adjacent water-cooled wall tubes 311. This ensures the flue gas flows according to a pre-set flow channel, thereby improving the utilization rate of flue gas heat. In this embodiment, both the first fin 12 and the second fin 32 are steel fins.

[0035] The flue gas generated by combustion in the furnace 31 undergoes multiple heat exchange cycles in the furnace 31, the first flue gas flow channel 5, and the second flue gas flow channel 6, and finally enters the steam collection box 4 to heat the incoming wet steam, so that the steam dryness meets the usage requirements, thereby achieving efficient utilization of flue gas heat energy.

[0036] The steam collection box 4 includes an outer cylinder 41 and an inner cylinder (not shown in the figure) fitted inside the outer cylinder 41. A flue gas chamber 8 is provided outside the outer cylinder 41, and the flue gas chamber 8 is connected to the second flue gas passage 6.

[0037] When the flue gas generated by combustion in the steam collecting box of furnace 31 enters the flue gas chamber 8 after passing through multiple return heat exchangers, it heats the steam with high humidity inside the outer cylinder 41 of the steam collecting box, so that the internal steam dryness meets the requirements.

[0038] A steam chamber 9 is formed between the inner cylinder of the steam collecting box and the outer cylinder 41 of the steam collecting box. The steam chamber 9 is connected to the upper collecting box 33 through the connecting pipe 10. A spiral flow channel (not shown in the figure) is welded into the steam chamber 9.

[0039] When the water vapor generated in the upper header 33 enters the steam chamber 9 through the connecting pipe 10, the wet steam flows along the spiral flow path within the steam chamber 9, continuously colliding with the inner wall of the steam chamber 9 and the spiral flow path. During this process, the moisture in the wet steam is effectively separated and knocked off, thus forming high-quality dry steam. Therefore, the spiral flow path not only increases the contact area and flow path of the wet steam but also enhances the steam separation effect, significantly improving the steam dryness and ensuring high-quality steam output, meeting the stringent requirements for dry steam in different scenarios.

[0040] A flue gas outlet 11 is provided on the side of the outer cylinder 41 of the steam collection box away from the main body 3 of the steam generator, and an energy-saving device (not shown in the figure) is provided on the flue gas outlet 11.

[0041] By installing an energy-saving device, the exhaust gas can be effectively treated for dust removal, reducing the emission of particulate matter and pollutants, thereby reducing the impact on the environment and meeting environmental protection requirements. Simultaneously, the energy-saving device can recover waste heat from the flue gas and convert it into usable thermal energy. In this application, the energy-saving device uses the recovered waste heat to preheat the water entering the steam generator cavity, ensuring the water in the steam generator has a certain temperature from the initial state. This reduces energy consumption during subsequent heating, further improving the thermal efficiency and energy-saving effect of the equipment, and thus enhancing the energy efficiency and economy of the steam generator.

[0042] The steam collection chamber 4 is equipped with a steam outlet, which includes an outlet valve, a safety valve, and a pressure gauge. The outlet valve controls the steam output flow rate, facilitating the adjustment of steam supply stability. The safety valve automatically releases steam when the system pressure exceeds a set range, preventing equipment damage due to overpressure and ensuring operational safety. The pressure gauge monitors the internal pressure of the steam generator in real time, providing accurate data support for equipment operation and maintenance. Therefore, the integrated design of these components significantly improves the safety, practicality, and ease of operation of the steam generator.

[0043] In some embodiments, a drain pipe 13 with a valve is provided on the lower header 34. By providing a drain pipe with a valve, impurities, sewage, and sediments accumulated in the lower header 34 can be periodically removed during the operation of the steam generator, thereby effectively preventing the accumulation of impurities from affecting the heat exchange efficiency and maintaining the normal operation of the steam generator.

[0044] In some embodiments, the housing 2 is provided with an insulation layer (not shown in the figure). The insulation layer effectively reduces heat loss to the external environment during steam generator operation, improves thermal energy utilization, and thus enhances the overall efficiency of the steam generator. Furthermore, the insulation layer lowers the surface temperature of the outer housing 2, reducing the risk of burns to operators and enhancing equipment safety. Simultaneously, this insulation layer helps the steam generator maintain stable operation under different environmental conditions, reducing the impact of ambient temperature fluctuations on the heat exchange process and improving the system's thermal efficiency and reliability.

[0045] The working principle of this utility model is as follows:

[0046] (1) Burner 1 selects oil and / or gas fuel and burns it fully in furnace 31 to release high-temperature flue gas. At the same time, it starts electric heating elements to heat the water in lower header 44 to provide heat energy for the main body of steam generator.

[0047] (2) The high-temperature flue gas enters the main body of the steam generator 3 from the furnace 31 and first undergoes radiative heat exchange in the furnace 31. During this process, the high-temperature flue gas transfers heat from the inside of the furnace 31 to the water-cooled wall tubes 311 that make up the furnace 31, so that the water temperature inside the water-cooled wall tubes 311 gradually increases, completing the first pass heat exchange.

[0048] (3) After the first pass heat exchange, the flue gas inside the furnace 31 flows to the end of the furnace 31 away from the burner 1 and enters the first flue gas flow channel 5. At this time, the flue gas comes into contact with the surface of the water-cooled wall tubes 311, the furnace 31 and the convection tube bundle 35, and continues to transfer heat to the water in the water-cooled wall tubes 311 and the convection tube bundle 35 through convection heat exchange. The water in the upper header 33 and the lower header 24 circulates through the water-cooled wall tubes 311 and the convection tube bundle 35, so that the heat is continuously transferred, thereby heating the water in the main body of the steam generator 3. At this time, the flue gas temperature drops to about 450°C, completing the second pass heat exchange.

[0049] (4) The flue gas flows from the first flue gas flow channel 5 to the end near the burner 1, and then turns upwards and gradually enters the corresponding second flue gas flow channel 6 through the flue gas turning chamber 14. It conducts convective heat exchange with the outer surface of the convection tube bundle 35, and continues to transfer heat to the water in the convection tube bundle 35, so that the temperature of the flue gas is further reduced, thereby completing the third pass heat exchange. After three passes of heat exchange, the water in the upper header 33, lower header 34, water-cooled wall tube 311 and convection tube bundle 35 continues to absorb heat and continuously vaporize, and generates wet steam.

[0050] (4) The generated wet steam enters the steam collection box 4 through the connecting pipe 10 connected to the upper header 33. The flue gas after the third pass heat exchange continues to rise and enters the flue gas chamber 9 to flush the inner wall of the steam collection box 4, completing the fourth pass heat exchange. In addition, the wet steam continuously collides with the inner wall of the outer cylinder 41 of the steam collection box, the body wall of the inner cylinder of the steam collection box, and the spiral flow channel. During this process, the moisture in the wet steam is transformed into high-quality dry steam through heat exchange and collision, meeting the dryness requirements of industrial steam. Finally, the dry steam is discharged through the steam outlet and transported to the place where steam is needed for use, while the flue gas after four passes of heat exchange enters the dust collector. At this stage, the waste heat in the flue gas is recovered and used to preheat the feedwater. At the same time, the dust collector filters the flue gas for particulate matter and pollutants, so that the emitted flue gas meets environmental protection requirements. Finally, the treated flue gas is discharged into the atmosphere through the chimney.

[0051] The above-disclosed embodiments are merely some preferred embodiments of the present utility model, and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent changes made in accordance with the scope of the present utility model patent application shall still fall within the scope of the present utility model.

Claims

1. A steam generator for use with oil, gas, and electricity, comprising a burner, a housing, a steam generator body disposed within the housing, and a steam collection chamber connected to the steam generator body; the steam collection chamber is provided with a steam outlet, characterized in that, The main body of the steam generator includes a hollow furnace chamber with one end connected to the burner, an upper manifold and a lower manifold for water storage, and two sets of convection tube bundles symmetrically arranged on the left and right sides of the furnace chamber. The upper manifold and the lower manifold are located at the upper and lower ends of the furnace chamber, respectively. The convection tube bundle includes several convection tubes, and the two ends of the convection tubes are respectively connected to the upper manifold and the lower manifold. The outer sides of adjacent convection tubes are all connected to each other. An electric heating element is installed in the lower manifold. The furnace is enclosed by a number of water-cooled wall tubes symmetrically arranged on the left and right sides of the burner, and the two ends of the water-cooled wall tubes are respectively connected to the upper header and the lower header; Two first flue gas channels are symmetrically arranged between the convection tube and the furnace, and the end of the furnace away from the burner is connected to the first flue gas channel; two second flue gas channels are symmetrically arranged between the convection tube and the shell; the end of the first flue gas channel near the burner is connected to the corresponding second flue gas channel, and the upper header and the second flue gas channels are respectively connected to the steam collection box.

2. A steam generator for use with oil, gas, and electricity according to claim 1, characterized in that, The electric heating element includes a plurality of electric heating tubes disposed inside the lower header.

3. A steam generator for use with oil, gas, and electricity according to claim 1, characterized in that, The steam collection box includes an outer cylinder and an inner cylinder fitted inside the outer cylinder. A flue gas chamber is provided outside the outer cylinder and is connected to the second flue gas flow channel.

4. A steam generator for use with oil, gas, and electricity according to claim 3, characterized in that, A steam chamber is formed between the inner cylinder and the outer cylinder of the steam collecting box. The steam chamber is connected to the upper collecting box through a connecting pipe. A spiral flow channel is welded into the steam chamber.

5. A steam generator for use with oil, gas, and electricity according to claim 3, characterized in that, A flue gas outlet is provided on the side of the outer cylinder of the steam collection box away from the main body of the steam generator, and an energy-saving device is installed on the flue gas outlet.

6. A steam generator for use with oil, gas, and electricity according to claim 1, characterized in that, Adjacent convection tubes are connected by a first fin, and adjacent water-cooled wall tubes are connected by a second fin.

7. A steam generator for use with oil, gas, and electricity according to claim 1, characterized in that, The steam outlet is equipped with an outlet valve, a safety valve and a pressure gauge, and the lower header is equipped with a drain pipe with a valve.

8. A steam generator for use with oil, gas, and electricity according to claim 1, characterized in that, Two flue gas turning chambers are symmetrically arranged on both sides of the housing near the burner end, and the first flue gas flow channel is connected to the second flue gas flow channel through the corresponding flue gas turning chamber.

9. A steam generator for use with oil, gas, and electricity according to claim 1, characterized in that, The shell is provided with a heat insulation layer.

10. A steam generator for use with oil, gas, and electricity according to claim 1, characterized in that, The furnace is located at the center of the main body of the steam generator, and the steam collection box is located at the top of the main body of the steam generator.

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