Steam overheating device

Abstract

The utility model relates to the technical field of energy environmental protection, in particular to a steam overheating device which comprises a fuel mechanism, a flue gas and air mechanism and a steam mechanism, and the fuel mechanism comprises a main fuel gas pipeline, an ignition fuel gas pipeline, a main fuel gas inlet, an ignition fuel gas inlet and a burner. The temperature of flue gas entering the superheater can be effectively adjusted through the flue gas and air mechanism, the superheater can be protected against burnout while the temperature of the incinerator is guaranteed, and the NOx emission value can be effectively reduced by adopting the flue gas recirculation design; the circulating flue gas can effectively reduce the flue gas flow of the chimney and effectively improve the efficiency of the superheater, the device can be horizontally arranged or vertically arranged, the requirements of various installation spaces can be met, the device can utilize fuel such as surplus coal gas to heat saturated steam, the steam power generation efficiency is improved, economic benefits can be brought to users, and the device is suitable for popularization and application. And meanwhile, the function of a waste gas and waste liquid incinerator can be considered, and market core competitiveness is high.

Description

Technical Field

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

[0002] In metallurgical and chemical enterprises, a significant amount of saturated steam is generated during waste heat recovery in various process stages. For example, in steel production, processes such as steelmaking converters and electric furnaces generate a large amount of waste heat, as do non-ferrous metal smelting processes such as lead-zinc smelting and copper smelting.

[0003] The production of these saturated steams is limited by the parameters of each process section, resulting in fluctuations in output. It is also limited by the amount of steam used in these process sections, making the overall surplus flow very unstable.

[0004] However, in the aforementioned existing technologies, the efficiency of using surplus saturated steam for power generation is low, and it is not suitable for external sale and is difficult to utilize. Utility Model Content

[0005] The purpose of this invention is to provide a steam superheating device that solves the problems in the prior art where excess saturated steam is difficult to use for power generation, is not suitable for external sale, and is difficult to utilize.

[0006] To achieve the above objectives, this utility model provides a steam superheating device, including a fuel mechanism, a flue gas mechanism, and a steam mechanism. The fuel mechanism includes a main gas pipeline, an ignition gas pipeline, a main gas inlet, an ignition gas inlet, and a burner. The main gas pipeline is connected to the main gas inlet pipeline, the ignition gas pipeline is connected to the ignition gas inlet pipeline, and the main gas inlet and the ignition gas inlet are respectively fixedly connected to the burner.

[0007] The flue gas system includes a combustion air inlet, an incinerator, a combustion air duct, a flue gas mixing device, a temperature regulating air duct, a high-temperature superheater, a low-temperature superheater, and a flue gas recirculation outlet duct. The combustion air inlet is located on the burner, and the incinerator is fixedly connected to the burner. The flue gas mixing device is located on the incinerator. One end of the temperature regulating air duct is connected to the combustion air duct, and the other end of the temperature regulating air duct is fixedly connected to the flue gas mixing device. The high-temperature superheater is located on the flue gas mixing device, and the low-temperature superheater is located after the high-temperature superheater.

[0008] The flue gas system further includes a combustion air main pipe, a combustion air fan, a flue gas recirculation fan, a flue gas recirculation inlet pipe, a chimney, and a tail flue. One end of the flue gas recirculation outlet pipe is fixedly connected to the flue gas recirculation fan, and the other end of the flue gas recirculation outlet pipe is connected to the combustion air duct. One end of the combustion air main pipe is fixedly connected to the combustion air fan, and the other end of the combustion air main pipe is fixedly connected to the combustion air duct. The other end of the combustion air duct is connected to the combustion air inlet pipe. One end of the tail flue is fixedly connected to the low-temperature superheater, and the other end of the tail flue is fixedly connected to the chimney. One end of the flue gas recirculation inlet pipe is fixedly connected to the flue gas recirculation fan, and the other end of the flue gas recirculation inlet pipe is fixedly connected to the tail flue.

[0009] The steam mechanism includes a saturated steam pipeline, a desuperheating water pipeline, a superheated steam pipeline, and a desuperheater. One end of the saturated steam pipeline is connected to the low-temperature superheater pipeline, and the other end of the saturated steam pipeline is connected to the flue gas recirculation outlet pipeline.

[0010] The desuperheater is located between the high-temperature superheater and the low-temperature superheater, the desuperheating water pipeline is connected to the desuperheater pipeline, and the superheated steam pipeline is connected to the high-temperature superheater pipeline.

[0011] This utility model discloses a steam superheating device. The ignition gas pipeline delivers ignition gas to the burner through the ignition gas inlet; the main gas pipeline delivers main gas to the burner through the main gas inlet. The flue gas mechanism effectively regulates the flue gas temperature entering the superheater, ensuring the incinerator temperature while protecting the superheater from burn-out. Furthermore, a flue gas recirculation design effectively reduces NOx emissions. The recirculated flue gas also effectively reduces the chimney flue gas flow, significantly improving superheater efficiency. This device can be installed horizontally or vertically to meet various installation space requirements. It can utilize surplus coal gas or other fuels to heat saturated steam, improving steam power generation efficiency and bringing economic benefits to users. Simultaneously, it can also function as a waste gas and waste liquid incinerator, giving it a strong competitive edge in the market. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0013] Figure 1 This is the overall system flowchart of this utility model.

[0014] Figure 2 This is a horizontal layout diagram of the overheating device of this utility model.

[0015] Figure 3 This is a vertical layout diagram of the overheating device of this utility model.

[0016] Figure 4 This is the utility model Figure 1 Enlarged view of the local structure at point A.

[0017] 1-Main gas pipeline, 2-Ignition gas pipeline, 3-Main gas inlet, 4-Ignition gas inlet, 5-Burner, 6-Combustion air inlet, 7-Incinerator, 8-Combustion air pipeline, 9-Smoke mixing device, 10-Temperature regulating air pipeline, 11-High temperature superheater, 12-Low temperature superheater, 13-Flue gas recirculation outlet pipeline, 14-Combustion air main pipe, 15-Combustion air fan, 16-Flue gas recirculation fan, 17-Flue gas recirculation inlet pipeline, 18-Saturated steam pipeline, 19-Chimney, 20-Tail flue, 21-Desuperheating water pipeline, 22-Superheated steam pipeline, 23-Desuperheater. Detailed Implementation

[0018] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0019] Please see Figures 1 to 4 ,in, Figure 1 This is the overall system flowchart of this utility model. Figure 2 This is a horizontal layout diagram of the superheating device of this utility model. Figure 3 This is a vertical layout diagram of the overheating device of this utility model. Figure 4 This is the utility model Figure 1 Enlarged view of the local structure at point A.

[0020] This utility model provides a steam superheating device, including a fuel mechanism, a flue gas mechanism, and a steam mechanism. The fuel mechanism includes a main gas pipeline 1, an ignition gas pipeline 2, a main gas inlet 3, an ignition gas inlet 4, and a burner 5. The main gas pipeline 1 is connected to the main gas inlet 3, the ignition gas pipeline 2 is connected to the ignition gas inlet 4, and the main gas inlet 3 and the ignition gas inlet 4 are respectively fixedly connected to the burner 5.

[0021] In this embodiment, the ignition gas pipeline 2 delivers ignition gas to the burner 5 through the ignition gas inlet 4; the main gas pipeline 1 delivers main gas to the burner 5 through the main gas inlet 3; the flue gas mechanism can effectively regulate the flue gas temperature entering the superheater, ensuring the temperature of the incinerator 7 while protecting the superheater from burnout, and adopts a flue gas recirculation design, which can effectively reduce NOx emissions; the recirculated flue gas can also effectively reduce the flue gas flow rate of the chimney 19, effectively improving the efficiency of the superheater. This device can be arranged horizontally or vertically to meet the needs of various installation spaces. This device can use surplus coal gas and other fuels to heat saturated steam, improving steam power generation efficiency and bringing economic benefits to users. At the same time, it can also serve as a waste gas and waste liquid incinerator 7, making it highly competitive in the market.

[0022] Further, the flue gas system includes a combustion air inlet 6, an incinerator 7, a combustion air duct 8, a flue gas mixing device 9, a temperature regulating air duct 10, a high-temperature superheater 11, a low-temperature superheater 12, and a flue gas recirculation outlet duct 13. The combustion air inlet 6 is disposed on the burner 5, the incinerator 7 is fixedly connected to the burner 5, the flue gas mixing device 9 is disposed on the incinerator 7, one end of the temperature regulating air duct 10 is connected to the combustion air duct 8, and the other end of the temperature regulating air duct 10 is fixedly connected to the flue gas mixing device 9. The high-temperature superheater 11 is disposed on the flue gas mixing device 9, and the low-temperature superheater 12 is disposed behind the high-temperature superheater 11. The flue gas system also includes a combustion air main duct 14, a combustion air fan 15, a flue gas recirculation fan 16, and a flue gas recirculation inlet duct 13. 7. Chimney 19 and tail flue 20, one end of the flue gas recirculation outlet pipe 13 is fixedly connected to the flue gas recirculation fan 16, the other end of the flue gas recirculation outlet pipe 13 is connected to the combustion air pipe 8, one end of the combustion air main pipe 14 is fixedly connected to the combustion air fan 15, the other end of the combustion air main pipe 14 is fixedly connected to the combustion air pipe 8, the other end of the combustion air pipe 8 is connected to the combustion air inlet pipe 6, one end of the tail flue 20 is fixedly connected to the low temperature superheater 12, the other end of the tail flue 20 is fixedly connected to the chimney 19, one end of the flue gas recirculation inlet pipe 17 is fixedly connected to the flue gas recirculation fan 16, and the other end of the flue gas recirculation inlet pipe 17 is fixedly connected to the tail flue 20.

[0023] In this embodiment, the combustion fan 15 draws air into the combustion fan header 14; the flue gas recirculation fan 16 introduces a portion of the flue gas from the tail flue 20 into the flue gas recirculation outlet pipe 13; the air from the combustion fan header 14 and the flue gas from the flue gas recirculation outlet pipe 13 are combined and then distributed to the combustion fan 8 and the temperature regulating fan 10; the air-flue gas mixture in the combustion fan 8 is sent to the burner 5 through the combustion fan inlet 6, where it is burned with the fuel gas to form high-temperature flue gas that is injected into the incinerator 7; the air-flue gas mixture in the temperature regulating fan 10 is sent to the mixing device 9 to mix with the high-temperature flue gas from the incinerator 7 to form suitable and stable flue gas, which is then sent to the high-temperature superheater 11 and the low-temperature superheater 12 for heat exchange, and the heat-exchanged flue gas is transported to the chimney 19 through the tail flue 20 and then discharged into the atmosphere.

[0024] Furthermore, the steam mechanism includes a saturated steam pipeline 18, a desuperheating water pipeline 21, a superheated steam pipeline 22, and a desuperheater 23. One end of the saturated steam pipeline 18 is connected to the low-temperature superheater 12 pipeline, and the other end of the saturated steam pipeline 18 is connected to the flue gas recirculation outlet pipeline 13. The desuperheater 23 is disposed between the high-temperature superheater 11 and the low-temperature superheater 12. The desuperheating water pipeline 21 is connected to the desuperheater 23 pipeline, and the superheated steam pipeline 22 is connected to the high-temperature superheater 11 pipeline.

[0025] In this embodiment, excess saturated steam is transported to the low-temperature superheater 12 for heating via the saturated steam pipeline 18. The superheated steam exiting the low-temperature superheater 12 is cooled by the desuperheater 23 and then enters the high-temperature superheater 11. After being superheated in the high-temperature superheater 11, the steam is transported to the steam turbine for power generation via the superheated steam pipeline 22. Desuperheating water is transported to the desuperheater 23 via the desuperheating water pipeline 21 to cool the superheated steam.

[0026] When using the steam superheating device of this utility model, the hot flue gas generated by the combustion of surplus fuel in the incinerator 7 is used to heat the steam in the high-temperature superheater 11 and the low-temperature superheater 12. The saturated steam is heated into superheated steam and then sent to the steam turbine to generate electricity. Superheated steam has a higher power generation efficiency than saturated steam. The combustion air blower 15 and the flue gas recirculation blower 16 are started, and the regulating dampers on the combustion air pipeline 8 and the temperature regulating air pipeline 10 are opened for furnace purging. The manual and electric valves of the saturated steam pipeline 18 are opened, the manual valve of the superheated steam pipeline 22 is closed, and the manual and electric valves of the superheated steam pipeline 22 venting pipeline are opened. Ignition fuel and main fuel are introduced according to the burner 5 ignition process, and the burner 5 is put into operation. The manual valve of the superheated steam pipeline 22 is opened, and the manual and electric valves of the superheated steam pipeline 22 venting pipeline are closed. The opening of the regulating valve on the main gas pipeline 1 and the regulating damper on the combustion air pipeline 8 are adjusted, while the opening of the regulating damper on the temperature regulating air pipeline 10 is adjusted to maintain the superheater inlet flue gas temperature and ensure the high-temperature superheater 11 outlet steam temperature. The temperature meets the system design requirements; the system switches to automatic mode, and the opening of the regulating valve on the main gas pipeline 1 automatically follows the adjustment of the outlet steam temperature of the high-temperature superheater 11; as the saturated steam volume increases, the superheated steam temperature decreases, and after the superheated steam temperature drops to the low set value, the regulating valve on the main gas pipeline 1 automatically opens; as the saturated steam volume decreases, the superheated steam temperature rises, and after the superheated steam temperature rises to the high set value, the regulating valve on the main gas pipeline 1 automatically closes; thus, automatic control of steam flow fluctuations is achieved; the opening of the regulating damper on the temperature regulating air pipeline 10 automatically follows the inlet flue gas temperature of the high-temperature superheater 11; when the inlet flue gas temperature of the high-temperature superheater 11 is higher than the high set value, the regulating damper on the temperature regulating air pipeline 10 automatically closes; when the inlet flue gas temperature of the high-temperature superheater 11 is lower than the low set value, the regulating damper on the temperature regulating air pipeline 10 automatically opens.

[0027] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A steam superheating device, characterized in that, This includes the fuel system, the flue gas system, and the steam system; The fuel system includes a main gas pipeline, an ignition gas pipeline, a main gas inlet, an ignition gas inlet, and a burner. The main gas pipeline is connected to the main gas inlet pipeline, the ignition gas pipeline is connected to the ignition gas inlet pipeline, and the main gas inlet and the ignition gas inlet are respectively fixedly connected to the burner.

2. The steam superheating device as described in claim 1, characterized in that, The flue gas system includes a combustion air inlet, an incinerator, a combustion air duct, a flue gas mixing device, a temperature regulating air duct, a high-temperature superheater, a low-temperature superheater, and a flue gas recirculation outlet duct. The combustion air inlet is located on the burner, and the incinerator is fixedly connected to the burner. The flue gas mixing device is located on the incinerator. One end of the temperature regulating air duct is connected to the combustion air duct, and the other end of the temperature regulating air duct is fixedly connected to the flue gas mixing device. The high-temperature superheater is located on the flue gas mixing device, and the low-temperature superheater is located after the high-temperature superheater.

3. The steam superheating device as described in claim 2, characterized in that, The flue gas system further includes a combustion air main pipe, a combustion air fan, a flue gas recirculation fan, a flue gas recirculation inlet pipe, a chimney, and a tail flue. One end of the flue gas recirculation outlet pipe is fixedly connected to the flue gas recirculation fan, and the other end of the flue gas recirculation outlet pipe is connected to the combustion air duct. One end of the combustion air main pipe is fixedly connected to the combustion air fan, and the other end of the combustion air main pipe is fixedly connected to the combustion air duct. The other end of the combustion air duct is connected to the combustion air inlet pipe. One end of the tail flue is fixedly connected to the low-temperature superheater, and the other end of the tail flue is fixedly connected to the chimney. One end of the flue gas recirculation inlet pipe is fixedly connected to the flue gas recirculation fan, and the other end of the flue gas recirculation inlet pipe is fixedly connected to the tail flue.

4. The steam superheating device as described in claim 3, characterized in that, The steam mechanism includes a saturated steam pipeline, a desuperheating water pipeline, a superheated steam pipeline, and a desuperheater. One end of the saturated steam pipeline is connected to the low-temperature superheater pipeline, and the other end of the saturated steam pipeline is connected to the flue gas recirculation outlet pipeline.

5. The steam superheating device as described in claim 4, characterized in that, The desuperheater is located between the high-temperature superheater and the low-temperature superheater. The desuperheating water pipeline is connected to the desuperheater pipeline, and the superheated steam pipeline is connected to the high-temperature superheater pipeline.

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