A saturated steam recovery system for a steelmaking vessel

Abstract

The utility model discloses a kind of steel converter saturated steam recovery systems, it includes converter steam drum, heat accumulator and steam turbine generator unit, and the converter steam drum is connected between steam turbine generator unit by main pipeline, and the main pipeline includes sequentially connected first pipeline, second pipeline and third pipeline, and the pipe diameter of the first pipeline is greater than the pipe diameter of the second pipeline, and the second pipeline and the third pipeline pipe diameter are equal;The heat accumulator is connected with the first pipeline by first air inlet pipe, is connected with the second pipeline by second air inlet pipe, is connected with the third pipeline by air outlet pipe;Check valve and regulating valve are provided on the second pipeline.The utility model divides steam delivery route into heat accumulation pressure stabilizing route and direct entering generator unit route, solves the problem of less steam recovery, steam turbine generator unit power generation efficiency is low, it can guarantee that generator unit can be in the smooth running of steelmaking under the condition of not blowing refining, and increase the power generation of unit.

Description

Technical Field

[0001] This utility model relates to the field of saturated steam recovery and utilization technology in steelmaking converters, and specifically to a saturated steam recovery system for steelmaking converters. Background Technology

[0002] Converter smelting oxidizes carbon and other impurities (such as silicon and manganese) in pig iron to produce steel with better physical, chemical, and mechanical properties than iron. During the converter smelting process, a large amount of high-temperature converter gas is generated. A converter flue gas cooling device cools the high-temperature converter gas, while the cooling water is heated and evaporated into saturated steam. Generally, about 90 kg of saturated steam can be recovered for every ton of molten steel produced in the converter. Furthermore, with the optimization of steelmaking processes, the amount of saturated steam generated by the converter is constantly increasing. Currently, this saturated steam is sent to a heat accumulator for pressure stabilization before entering a steam turbine generator set for power generation, converting thermal energy into electrical energy.

[0003] Because the oxygen blowing process in steelmaking is intermittent, occurring every 20-30 minutes with each blowing session lasting approximately 800-900 seconds, the high flue gas temperature during oxygen blowing generates a large amount of saturated steam instantaneously. This rapid influx of saturated steam into the accumulator increases its pressure, which in turn increases the pressure resistance of the main steam pipeline, obstructing steam flow and increasing pressure loss, thus reducing steam utilization. Conversely, if the large amount of steam does not enter the accumulator quickly enough, the high pressure in the steelmaking drum causes steam to escape, resulting in wasted steam. Therefore, although current steelmaking process optimizations have significantly increased the steam volume in the converter, the substantial steam loss due to venting has resulted in minimal improvement in the power generation of the saturated steam generator set. Furthermore, for multiple steelmaking converters, each has a pipeline that sends saturated steam to the accumulator. The long steam pipelines lead to significant pressure loss at the saturated steam generator set, making it prone to operating below full capacity and impacting its power generation efficiency. Utility Model Content

[0004] In view of this, the present invention provides a saturated steam recovery system for steelmaking converters, which aims to reduce the waste of saturated steam from steelmaking converters and improve the power generation efficiency of saturated steam generator sets.

[0005] To achieve the above objectives, the present invention provides the following technical solution.

[0006] This utility model provides a saturated steam recovery system for a steelmaking converter, comprising a converter steam drum, a heat accumulator, and a steam turbine generator set. The converter steam drum and the steam turbine generator set are connected by a main pipeline, which includes a first pipeline, a second pipeline, and a third pipeline connected in sequence. The diameter of the first pipeline is larger than that of the second pipeline, and the diameters of the second pipeline and the third pipeline are equal. The heat accumulator is connected to the first pipeline through a first inlet pipe, to the second pipeline through a second inlet pipe, and to the third pipeline through an outlet pipe. A check valve and a regulating valve are installed on the second pipeline.

[0007] The saturated steam recovery system provided by this utility model divides the saturated steam from steelmaking into three groups. Two groups of steam enter the accumulator through the first and second inlet pipes for pressure stabilization and heat storage. The other group of steam is directly sent to the third pipeline through a regulating valve to participate in power generation. The amount of steam entering the turbine generator can be directly adjusted through the regulating valve. In this way, during the converter blowing period when the steam volume is large, the steam can quickly enter the turbine to do work, and a small amount enters the accumulator. This avoids increasing the pressure resistance of the main steam pipeline when the accumulator pressure is high, thus improving the utilization rate of steam energy. During the non-blowing period, when the steam volume is small, a large amount of steam can enter the accumulator to maintain the overall pressure balance and prevent the unit from shutting down due to low steam pressure.

[0008] Furthermore, in the above technical solution, regulating valves are provided on the first and second air inlet pipes to adjust the amount of steam entering the heat accumulator.

[0009] Furthermore, in the above technical solution, there are multiple converter steam drums, and the steam from multiple converter steam drums is collected into the same pipeline for transportation, which can shorten the steam pipeline and reduce the pressure resistance during the steam transportation process.

[0010] Furthermore, in the above technical solution, the elbow on the second pipe is a hot-pressed large-radius elbow, which can reduce the pipe pressure resistance.

[0011] Furthermore, the preferred embodiment provided by this utility model is to select three converter steam drums, select a first pipe with a diameter of 480mm, and select a second pipe with a diameter of 400mm.

[0012] Compared with the prior art, the saturated steam recovery system for steelmaking converters provided by this utility model solves the problems of low steam recovery and low power generation efficiency of steam turbine generator sets by modifying the steam transmission pipeline and dividing the steam transmission route into a heat storage and pressure stabilization route and a direct entry route into the generator set. It can ensure that the generator set can operate stably in the case of steelmaking without blowing while increasing the power generation of the unit. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the saturated steam recovery system for a steelmaking converter provided by this utility model.

[0014] Legend:

[0015] 1-Converter steam drum; 2-Accumulator; 3-Steam turbine generator set; 41-First pipe; 42-Second pipe; 43-Third pipe; 51-First inlet pipe; 52-Second inlet pipe; 53-Outlet pipe; 61-Check valve; 62-Regulating valve; 63-Regulating valve; 64-Regulating valve. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] See Figure 1 This utility model provides a saturated steam recovery system for a steelmaking converter, comprising a converter steam drum 1, a heat accumulator 2, and a steam turbine generator set 3. The converter steam drum 1 and the steam turbine generator set 3 are connected by a main pipeline, which includes a first pipeline 41, a second pipeline 42, and a third pipeline 43 connected in sequence. The diameter of the first pipeline 41 is larger than that of the second pipeline 42, and the diameters of the second pipeline 42 and the third pipeline 43 are equal. The heat accumulator 2 is connected to the first pipeline 41 via a first inlet pipe 51, to the second pipeline 42 via a second inlet pipe 52, and to the third pipeline 43 via an outlet pipe 53. A check valve 61 and a regulating valve 62 are installed on the second pipeline 42. The first inlet pipe 51 is equipped with a regulating valve 63, and the second inlet pipe 52 is equipped with a regulating valve 64.

[0018] In the original design of the applicant's steelmaking lines 1, 2, and 3, the saturated steam from the steam drums 1 and 2 shared a single DN250mm steam pipeline to deliver the saturated steam to the saturated power generation accumulator. The steam drum 3 used a separate DN250mm steam pipeline to deliver the saturated steam to the saturated power generation accumulator. This design resulted in long steam pipelines and a significant steam pressure loss to the saturated steam unit, approaching 0.3 MPa. The steelmaking converter saturated steam recovery system described in the above embodiment was adopted to modify this system. The steam from the steam drums 1, 2, and 3 was simultaneously collected into a DN480mm pipeline, sharing a single pipeline to deliver the steam to the saturated power generation unit. Before entering the saturated generator unit, the saturated steam from the steelmaking line was divided into three parts. Two parts entered the accumulator through the original pipeline for pressure stabilization and heat storage. The remaining part was directly delivered to the main steam pipeline through a regulating valve. To prevent backflow from the main steam pipeline into the steelmaking steam pipeline due to high pressure, a check valve was added to the DN400mm pipeline. All pipeline tees were replaced with prefabricated tees, and elbows were replaced with hot-pressed large-radius elbows to reduce resistance. This modification shortened the length of the steam pipeline, reduced heat loss, lowered the pressure resistance during steam transport by approximately 0.15 MPa, increased the unit's power generation by approximately 8,000 kWh / day compared to before the modification, and increased the power generation per ton of steel by approximately 1.0 kWh / t.

[0019] The above are merely preferred embodiments of this utility model. It should be noted that the above preferred embodiments should not be considered as limitations on this utility model, and the scope of protection of this utility model should be determined by the scope defined in the claims. For those skilled in the art, several improvements and modifications can be made without departing from the spirit and scope of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A steelmaking vessel saturated steam recovery system characterized by: The system includes a converter steam drum, a heat accumulator, and a steam turbine generator set. The converter steam drum and the steam turbine generator set are connected by a main pipeline. The main pipeline includes a first pipeline, a second pipeline, and a third pipeline connected in sequence. The diameter of the first pipeline is larger than that of the second pipeline, and the diameters of the second pipeline and the third pipeline are equal. The heat accumulator is connected to the first pipeline through a first inlet pipe, to the second pipeline through a second inlet pipe, and to the third pipeline through an outlet pipe. A check valve and a regulating valve are installed on the second pipeline.

2. A saturated steam recovery system for a steelmaking vessel as claimed in claim 1 wherein: The first and second air intake pipes are equipped with regulating valves.

3. A saturated steam recovery system for a steelmaking vessel as defined in claim 1, wherein: The number of converter steam drums is multiple.

4. The saturated steam recovery system for a steelmaking converter according to claim 1, characterized in that: The elbow on the second pipe is a hot-pressed large-radius elbow.

5. A saturated steam recovery system for a steelmaking vessel as defined in claim 1, wherein: The converter steam drum consists of three parts, with the first pipe having a diameter of 480 mm and the second pipe having a diameter of 400 mm.

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