A multi-steam source combined power generation system that utilizes sintering waste heat to improve efficiency

Abstract

This invention discloses a multi-steam source combined power generation system that utilizes sintering waste heat for efficiency improvement, belonging to the field of waste heat power generation technology in steel enterprises. To utilize waste heat steam sources of different qualities in steel enterprises for power generation, the multi-steam source combined power generation system utilizing sintering waste heat for efficiency improvement includes an electric furnace waste heat system (1), a converter waste heat system (2), a sintering waste heat system (3), a rolling mill heating furnace waste heat system (4), a steam storage tank (5), a heat exchange device (6), and a power generation system (7). Steam in the steam storage tank (5) can enter the heat exchange device (6) to absorb heat, and sintering waste heat steam in the sintering waste heat system (3) can enter the heat exchange device (6) to release heat. This multi-steam source combined power generation system utilizes multiple or multi-stage steam sources of different qualities in steel enterprises for comprehensive utilization, thereby improving the utilization efficiency of waste heat resources in steel enterprises.

Description

Technical Field

[0001] This invention relates to the field of waste heat power generation technology in steel enterprises, specifically a multi-steam source combined power generation system that utilizes sintering waste heat to improve efficiency. Background Technology

[0002] Industrial enterprises, especially steel mills, possess numerous waste heat resources that can be utilized to generate steam for external transmission. Examples include sintering waste heat steam, converter waste heat steam, electric arc furnace waste heat steam, and rolling mill heating furnace waste heat steam. Sintering waste heat steam, due to its higher temperature, is typically used in power generation systems. However, the large quantities of saturated steam generated through vaporization cooling in converter steelmaking, electric arc furnace steelmaking, and rolling mill heating furnace systems cannot be widely used by industrial users due to steam quality issues and the intermittent nature of converter and electric arc furnace processes. Most of the steam is used for low-quality applications such as domestic or heating systems via the plant's low-pressure steam network. Furthermore, because user consumption is small and lacks continuity, a significant amount of waste heat saturated steam is still released into the atmosphere, reducing the overall economic benefits of the enterprise and causing environmental pollution.

[0003] Therefore, combining steam sources of different qualities before supplying them to industrial users or for power generation to increase efficiency has become a popular and widely accepted technical approach in recent years. Conventional combined steam sources simply deliver steam of different qualities to the user side, relying on the user to absorb the differences between the steam sources to achieve the combined effect. However, this method typically places higher demands on users, requiring a wide range of usable steam parameters, and the system is complex, often requiring separate auxiliary equipment for different steam qualities, resulting in high investment and maintenance costs. Summary of the Invention

[0004] In order to generate electricity using waste heat steam sources of different qualities in steel enterprises, this invention provides a multi-steam source combined power generation system that utilizes sintering waste heat to improve efficiency. The multi-steam source combined power generation system that utilizes sintering waste heat combines multiple or multiple stages of steam sources of different qualities in steel enterprises for comprehensive utilization, thereby improving the utilization efficiency of waste heat resources in steel enterprises.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A multi-steam-source combined power generation system utilizing sintering waste heat for efficiency improvement includes an electric furnace waste heat system, a converter waste heat system, a sintering waste heat system, a rolling mill heating furnace waste heat system, a steam storage tank, a heat exchange device, and a power generation system. Waste heat steam from the electric furnace waste heat system can absorb heat in the heat exchange device or be stored in the steam storage tank. Waste heat steam from the converter waste heat system can absorb heat in the heat exchange device or be stored in the steam storage tank. Steam in the steam storage tank can absorb heat in the heat exchange device. Waste heat steam from the rolling mill heating furnace waste heat system can absorb heat in the heat exchange device. Sintering waste heat steam from the sintering waste heat system can release heat in the heat exchange device. Steam discharged from the heat exchange device can enter the turbine of the power generation system.

[0007] The heat exchange device includes a first steam heat absorption inlet, a first steam heat absorption outlet, a first steam heat release inlet, a first steam heat release outlet, a second steam heat absorption inlet, a second steam heat absorption outlet, a second steam heat release inlet, and a second steam heat release outlet.

[0008] The electric furnace waste heat system includes an electric furnace waste heat steam supply pipeline, and the converter waste heat system includes a converter waste heat steam supply pipeline. The electric furnace waste heat steam supply pipeline and the converter waste heat steam supply pipeline are connected to the first steam absorption inlet of the heat exchange device through a steam mixing header.

[0009] The sintering waste heat system includes a sintering high-pressure steam generation pipeline and a sintering low-pressure steam generation pipeline. The sintering high-pressure steam generation pipeline is connected to the first steam heat release inlet, and the sintering low-pressure steam generation pipeline is connected to the second steam heat release inlet.

[0010] The multi-steam source combined power generation system that utilizes sintering waste heat for efficiency improvement includes a steam storage tank, which is connected to a steam mixing header via a first steam inlet / outlet pipe.

[0011] The heat exchange device is a waste heat boiler with a split structure. The heat exchange device contains two inner chambers. One inner chamber is equipped with a first heat absorption pipe and a first heat release pipe, and the other inner chamber is equipped with a second heat absorption pipe and a second heat release pipe.

[0012] The heat exchange device is a waste heat boiler. The heat exchange device has an integrated structure and contains an inner chamber. The inner chamber is equipped with a first heat absorption pipe, a first heat release pipe, a second heat absorption pipe, and a second heat release pipe.

[0013] The first steam heat absorption inlet and the first steam heat absorption outlet are located at the two ends of the first heat absorption tube, the first steam heat release inlet and the first steam heat release outlet are located at the two ends of the first heat release tube, the second steam heat absorption inlet and the second steam heat absorption outlet are located at the two ends of the second heat absorption tube, and the second steam heat release inlet and the second steam heat release outlet are located at the two ends of the second heat release tube.

[0014] The waste heat system of the steel rolling heating furnace is connected to the second steam absorption inlet of the heat exchange device through the waste heat steam supply pipeline of the steel rolling heating furnace.

[0015] The power generation system includes a condensing steam turbine with supplementary steam. The main steam inlet of the condensing steam turbine is connected to the main steam input pipeline, and the supplementary steam inlet of the condensing steam turbine is connected to the supplementary steam input pipeline. The first steam heat absorption outlet is connected to the main steam input pipeline through the first branch pipe, the first steam heat release outlet is connected to the main steam input pipeline through the second branch pipe, the second steam heat absorption outlet is connected to the supplementary steam input pipeline through the third branch pipe, and the second steam heat release outlet is connected to the supplementary steam input pipeline through the fourth branch pipe.

[0016] The beneficial effects of this invention are:

[0017] 1. Integrate waste heat steam sources with various parameters and qualities within the steel plant and apply them to the power generation system to improve the utilization rate of waste heat steam.

[0018] 2. Peak shaving and valley filling of intermittent waste heat resources from electric furnaces and converters, ensuring stable external transmission and improving steam parameter quality.

[0019] 3. When improving the quality of saturated steam with different parameters, sintered waste heat boiler evaporators are used. Depending on the application scenario, integrated or split structures can be adopted to improve the energy efficiency of waste heat resources of different qualities, and all of them are connected to the power generation system. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0021] Figure 1 This is a schematic diagram of a split-type structure for the heat exchange device of the multi-steam source combined power generation system that utilizes sintering waste heat to improve efficiency, as described in this invention.

[0022] Figure 2 This is a schematic diagram of the heat exchange device of the multi-steam source combined power generation system that utilizes sintering waste heat to improve efficiency, as described in this invention, which is an integrated structure.

[0023] The annotations in the attached figures are explained as follows:

[0024] 1. Electric furnace waste heat system; 2. Converter waste heat system; 3. Sintering waste heat system; 4. Rolling mill heating furnace waste heat system; 5. Steam accumulator; 6. Heat exchanger; 7. Power generation system; 8. Valves; 9. Condenser;

[0025] 11. Waste heat steam supply pipeline for electric furnace;

[0026] 21. Converter waste heat steam supply pipeline;

[0027] 31. Sintered high-pressure steam generation pipeline; 32. Sintered low-pressure steam generation pipeline;

[0028] 41. Waste heat steam supply pipeline for steel rolling heating furnace;

[0029] 51. First steam inlet and outlet pipes;

[0030] 61. First steam heat absorption inlet; 62. First steam heat absorption outlet; 63. First steam heat release inlet; 64. First steam heat release outlet; 65. Second steam heat absorption inlet; 66. Second steam heat absorption outlet; 67. Second steam heat release inlet; 68. Second steam heat release outlet; 69. Steam mixing header; 610. Inner chamber; 611. First heat absorption pipe; 612. First heat release pipe; 613. Second heat absorption pipe; 614. Second heat release pipe;

[0031] 71. Replenishment steam turbine; 72. Main steam inlet; 73. Main steam input pipeline; 74. Replenishment steam inlet; 75. Replenishment steam input pipeline;

[0032] 621. First branch pipe;

[0033] 641. Second branch pipe;

[0034] 661. Third branch pipe;

[0035] 681. Fourth branch pipe. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] A multi-steam-source combined power generation system utilizing sintering waste heat for efficiency improvement includes an electric furnace waste heat system 1, a converter waste heat system 2, a sintering waste heat system 3, a rolling mill heating furnace waste heat system 4, a steam storage tank 5, a heat exchange device 6, and a power generation system 7. Waste heat steam from the electric furnace in the electric furnace waste heat system 1 can absorb heat in the heat exchange device 6 or be stored in the steam storage tank 5. Waste heat steam from the converter in the converter waste heat system 2 can absorb heat in the heat exchange device 6 or be stored in the steam storage tank 5. Steam in the steam storage tank 5 can absorb heat in the heat exchange device 6. Waste heat steam from the rolling mill heating furnace in ... Figure 1 As shown.

[0038] In this embodiment, the heat exchange device 6 includes a first steam heat absorption inlet 61, a first steam heat absorption outlet 62, a first steam heat release inlet 63, a first steam heat release outlet 64, a second steam heat absorption inlet 65, a second steam heat absorption outlet 66, a second steam heat release inlet 67, and a second steam heat release outlet 68.

[0039] Steam entering from the first steam heat absorption inlet 61 absorbs heat in the heat exchanger 6 and then exits from the first steam heat absorption outlet 62. Steam entering from the first steam heat release inlet 63 releases heat in the heat exchanger 6 and then exits from the first steam heat release outlet 64. Steam entering from the second steam heat absorption inlet 65 absorbs heat in the heat exchanger 6 and then exits from the second steam heat absorption outlet 66. Steam entering from the second steam heat release inlet 67 releases heat in the heat exchanger 6 and then exits from the second steam heat release outlet 68.

[0040] In this embodiment, the electric furnace waste heat system 1 includes an electric furnace waste heat steam supply pipeline 11, and the electric furnace waste heat steam generated by the electric furnace waste heat system 1 enters the electric furnace waste heat steam supply pipeline 11. The converter waste heat system 2 includes a converter waste heat steam supply pipeline 21, and the converter waste heat steam generated by the converter waste heat system 2 enters the converter waste heat steam supply pipeline 21.

[0041] In this embodiment, the electric furnace waste heat steam supply line 11 and the converter waste heat steam supply line 21 are connected to the first steam absorption inlet 61 of the heat exchange device 6 via a steam mixing header 69. The sintering waste heat system 3 includes a sintering high-pressure steam generation pipeline 31 and a sintering low-pressure steam generation pipeline 32. The sintering high-pressure steam generation pipeline 31 is connected to the first steam release inlet 63, and the sintering low-pressure steam generation pipeline 32 is connected to the second steam release inlet 67. The high-pressure waste heat steam generated by the sintering machine enters the sintering high-pressure steam generation pipeline 31, and the low-pressure waste heat steam generated by the sintering machine enters the sintering low-pressure steam generation pipeline 32.

[0042] In this embodiment, a valve 8 is provided on the steam mixing header 69, which can regulate the gas flow rate of the steam mixing header 69. The multi-steam source combined power generation system utilizing sintering waste heat for efficiency improvement may include a steam storage tank 5, which is connected to the steam mixing header 69 via a first steam inlet / outlet pipe 51. The structure of the steam storage tank 5 is roughly the same as that of a conventional sealed gas storage tank or liquid storage tank. The outer side of the steam storage tank 5 is provided with a good insulation layer to store the heat energy in the steam, such as... Figure 1 As shown.

[0043] When the steam flow rate in the electric furnace waste heat steam supply pipeline 11 is high, the electric furnace waste heat steam in the electric furnace waste heat system 1 can enter the steam storage tank 5 and the heat exchange device 6. When the steam flow rate in the electric furnace waste heat steam supply pipeline 11 is low, the steam stored in the steam storage tank 5 can enter the heat exchange device 6. When the steam flow rate in the converter waste heat steam supply pipeline 21 is high, the converter waste heat steam in the converter waste heat system 2 can enter the steam storage tank 5 and the heat exchange device 6. When the steam flow rate in the converter waste heat steam supply pipeline 21 is low, the steam stored in the steam storage tank 5 can enter the heat exchange device 6. The steam storage tank 5 and the valve 8 work together to achieve peak shaving and valley filling of intermittent waste heat resources from the electric furnace and converter, ensuring stable external delivery and improving steam parameter quality. In addition, valves 8 can be installed on each of the other pipelines.

[0044] In this embodiment, the heat exchange device 6 is a waste heat boiler. Since the heat source of the waste heat boiler comes from the sintering machine, the waste heat boiler can also be called a sintering waste heat boiler. The heat exchange device 6 can be a split structure, containing two inner chambers 610. One inner chamber 610 is equipped with a first heat absorption pipe 611 and a first heat release pipe 612, and the other inner chamber 610 is equipped with a second heat absorption pipe 613 and a second heat release pipe 614. The first heat absorption pipe 611 and the second heat absorption pipe 613 can be the evaporator of the waste heat boiler, such as... Figure 1 As shown. Alternatively, the heat exchanger 6 can also be an integral structure, containing an inner chamber 610, within which are arranged a first heat absorption pipe 611, a first heat release pipe 612, a second heat absorption pipe 613, and a second heat release pipe 614, as shown. Figure 2 As shown.

[0045] In this embodiment, the first steam heat absorption inlet 61 and the first steam heat absorption outlet 62 are located at both ends of the first heat absorption tube 611, the first steam heat release inlet 63 and the first steam heat release outlet 64 are located at both ends of the first heat release tube 612, the second steam heat absorption inlet 65 and the second steam heat absorption outlet 66 are located at both ends of the second heat absorption tube 613, and the second steam heat release inlet 67 and the second steam heat release outlet 68 are located at both ends of the second heat release tube 614. The waste heat system 4 of the rolling mill heating furnace is connected to the second steam heat absorption inlet 65 of the heat exchange device 6 through the waste heat steam supply pipeline 41 of the rolling mill heating furnace, and the waste heat steam generated by the waste heat system 4 of the rolling mill heating furnace enters the waste heat steam supply pipeline 41 of the rolling mill heating furnace.

[0046] In this embodiment, the power generation system 7 includes a condensing steam turbine 71 with supplementary steam. The main steam inlet 72 of the condensing steam turbine 71 is externally connected to a main steam input pipeline 73, and the supplementary steam inlet 74 of the condensing steam turbine 71 is externally connected to a supplementary steam input pipeline 75. A first steam heat absorption outlet 62 is connected to the main steam input pipeline 73 via a first branch pipe 621, a first steam heat release outlet 64 is connected to the main steam input pipeline 73 via a second branch pipe 641, a second steam heat absorption outlet 66 is connected to the supplementary steam input pipeline 75 via a third branch pipe 661, and a second steam heat release outlet 68 is connected to the supplementary steam input pipeline 75 via a fourth branch pipe 681. A condenser 9 is externally connected to the steam outlet of the condensing steam turbine 71. The condenser 9 converts the steam discharged from the steam outlet of the condensing steam turbine 71 into water, which is then used as makeup water for the waste heat boiler.

[0047] The following describes the working process of the multi-steam source combined power generation system that utilizes sintering waste heat to improve efficiency.

[0048] When the steam flow rate in the electric furnace waste heat steam supply pipeline 11 is high, the electric furnace waste heat steam in the electric furnace waste heat system 1 enters the steam accumulator tank 5 for storage and heat exchange device 6 for heat absorption. When the steam flow rate in the electric furnace waste heat steam supply pipeline 11 is low, the steam stored in the steam accumulator tank 5 enters the heat exchange device 6 for heat absorption. When the steam flow rate in the converter waste heat steam supply pipeline 21 is high, the converter waste heat steam in the converter waste heat system 2 enters the steam accumulator tank 5 for storage and heat exchange device 6 for heat absorption. When the steam flow rate in the converter waste heat steam supply pipeline 21 is low, the steam stored in the steam accumulator tank 5 enters the heat exchange device 6 for heat absorption. After absorbing heat in the heat exchange device 6, the electric furnace waste heat steam and the converter waste heat steam enter the main steam inlet 72 of the supplementary steam condensing turbine 71 through the main steam input pipeline 73, driving the supplementary steam condensing turbine 71 to generate electricity.

[0049] The waste heat steam from the steel rolling furnace in the waste heat system 4 enters the heat exchange device 6 to absorb heat. After absorbing heat, the waste heat steam from the steel rolling furnace enters the steam inlet 74 of the steam condensing turbine 71 through the steam injection pipeline 75, driving the steam condensing turbine 71 to generate electricity.

[0050] The high-pressure superheated steam (steam pressure approximately 1.6MPa-2.6MPa) generated by the sintering waste heat system 3 first enters the heat exchanger 6 to release heat after passing through the high-pressure steam generation pipeline 31. Then, it also enters the main steam inlet 72 of the supplementary steam condensing turbine 71 through the main steam input pipeline 73, driving the supplementary steam condensing turbine 71 to generate electricity. The low-pressure superheated steam (steam pressure approximately 0.3MPa-0.8MPa) generated by the sintering waste heat system 3 first enters the heat exchanger 6 to release heat. Then, it also enters the supplementary steam inlet 74 of the supplementary steam condensing turbine 71 through the supplementary steam input pipeline 75, driving the supplementary steam condensing turbine 71 to generate electricity.

[0051] The above description is merely a specific embodiment of the present invention and should not be construed as limiting the scope of the invention. Therefore, any substitution of equivalent components or equivalent changes and modifications made within the scope of protection of this patent should still fall within the scope of this patent. Furthermore, the technical features, technical solutions, and embodiments of the present invention can be freely combined and used together.

Claims

1. A multi-steam source combined power generation system that utilizes sintering waste heat to improve efficiency, characterized in that, The multi-steam source combined power generation system that utilizes sintering waste heat to improve efficiency includes an electric furnace waste heat system (1), a converter waste heat system (2), a sintering waste heat system (3), a steel rolling heating furnace waste heat system (4), a steam storage tank (5), a heat exchange device (6), and a power generation system (7). The waste heat steam from the electric furnace in the waste heat system (1) can enter the heat exchange device (6) to absorb heat or enter the steam storage tank (5) for storage. The waste heat steam from the converter in the waste heat system (2) can enter the heat exchange device (6) to absorb heat or enter the steam storage tank (5) for storage. The steam in the steam storage tank (5) can enter the heat exchange device (6) to absorb heat. The waste heat steam from the rolling mill in the waste heat system (4) can enter the heat exchange device (6) to absorb heat. The waste heat steam from the sintering in the waste heat system (3) can enter the heat exchange device (6) to release heat. The steam discharged from the heat exchange device (6) can enter the turbine of the power generation system (7). The heat exchange device (6) includes a first steam heat absorption inlet (61), a first steam heat absorption outlet (62), a first steam heat release inlet (63), a first steam heat release outlet (64), a second steam heat absorption inlet (65), a second steam heat absorption outlet (66), a second steam heat release inlet (67), and a second steam heat release outlet (68); The sintering waste heat system (3) includes a sintering high-pressure steam generation pipeline (31) and a sintering low-pressure steam generation pipeline (32). The sintering high-pressure steam generation pipeline (31) is connected to the first steam heat release inlet (63), and the sintering low-pressure steam generation pipeline (32) is connected to the second steam heat release inlet (67). The heat exchange device (6) is a waste heat boiler. The heat exchange device (6) has a split structure. The heat exchange device (6) contains two inner chambers (610). One inner chamber (610) is equipped with a first heat absorption pipe (611) and a first heat release pipe (612). The other inner chamber (610) is equipped with a second heat absorption pipe (613) and a second heat release pipe (614). The power generation system (7) includes a steam-assisted condensing turbine (71). The main steam inlet (72) of the steam-assisted condensing turbine (71) is connected to the main steam input pipeline (73), and the steam-assisted steam inlet (74) of the steam-assisted condensing turbine (71) is connected to the steam-assisted input pipeline (75). The first steam heat absorption outlet (62) is connected to the main steam input pipeline (73) through the first branch pipe (621), the first steam heat release outlet (64) is connected to the main steam input pipeline (73) through the second branch pipe (641), the second steam heat absorption outlet (66) is connected to the steam-assisted input pipeline (75) through the third branch pipe (661), and the second steam heat release outlet (68) is connected to the steam-assisted input pipeline (75) through the fourth branch pipe (681).

2. The multi-steam source combined power generation system utilizing sintering waste heat for efficiency improvement according to claim 1, characterized in that, The electric furnace waste heat system (1) includes an electric furnace waste heat steam supply pipeline (11), and the converter waste heat system (2) includes a converter waste heat steam supply pipeline (21). The electric furnace waste heat steam supply pipeline (11) and the converter waste heat steam supply pipeline (21) are connected to the first steam heat absorption inlet (61) of the heat exchange device (6) through a steam mixing header (69).

3. The multi-steam source combined power generation system utilizing sintering waste heat for efficiency improvement according to claim 2, characterized in that, The multi-steam source combined power generation system that utilizes sintering waste heat to improve efficiency includes a steam storage tank (5), which is connected to a steam mixing header (69) via a first steam inlet / outlet pipe (51).

4. The multi-steam source combined power generation system for improving efficiency using sintering waste heat according to claim 1, characterized in that, The first steam heat absorption inlet (61) and the first steam heat absorption outlet (62) are located at both ends of the first heat absorption tube (611), the first steam heat release inlet (63) and the first steam heat release outlet (64) are located at both ends of the first heat release tube (612), the second steam heat absorption inlet (65) and the second steam heat absorption outlet (66) are located at both ends of the second heat absorption tube (613), and the second steam heat release inlet (67) and the second steam heat release outlet (68) are located at both ends of the second heat release tube (614).

5. The multi-steam source combined power generation system for improving efficiency using sintering waste heat according to claim 1, characterized in that, The waste heat system (4) of the steel rolling furnace is connected to the second steam absorption inlet (65) of the heat exchange device (6) through the waste heat steam supply pipeline (41) of the steel rolling furnace.

Images