A saturated steam pipe network operating system

Abstract

The application provides a saturated steam pipe network operation system, which comprises a steam pipe network and a steam production point, a production steam production point, a saturated steam power generation unit and a steam accumulator connected to the steam pipe network, wherein a first regulating valve is installed on a connecting pipeline of each steam production point and the steam pipe network; wherein a flow control device is installed on a connecting pipeline of each production steam production point and the steam pipe network; wherein the saturated steam power generation unit comprises a plurality of steam turbine units, a second regulating valve and a third regulating valve are arranged on a connecting pipeline of the saturated steam power generation unit and the steam pipe network, the second regulating valve is located upstream of the third regulating valve, the third regulating valve is used for controlling the stable steam inlet pressure of the steam turbine, and the second regulating valve is used for controlling the stable pressure of the steam pipe network. The application is based on the integrated and collaborative consideration of the source-network-load-storage of a steel enterprise, and guarantees the stable operation pressure of the steam pipe network.

Description

Technical Field

[0001] This invention belongs to the field of steam pipeline network utilization technology, and more specifically, relates to a saturated steam pipeline network operation system. Background Technology

[0002] Saturated steam systems are one of the main energy media systems for steel enterprises. Improving the transmission and operation efficiency of saturated steam pipelines is of great significance for reducing energy consumption in steel enterprises.

[0003] Numerous problems exist in the current operation of saturated steam pipeline networks in steel enterprises. Steam production points, steam consumption points, and saturated steam power generation units are typically distributed across different areas of the steel plant, employing decentralized control. During pipeline operation, problems such as pressure loss and venting frequently occur due to poor coordination, resulting in wasted saturated steam resources and low steam utilization efficiency. Furthermore, due to the characteristics of steel enterprise production processes, steam production and consumption fluctuate, leading to large fluctuations in pipeline steam pressure and flow, and frequent venting issues, posing challenges to the safe and stable operation of the saturated steam pipeline network. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a method for efficient operation control of saturated steam pipeline networks in steel production enterprises, which can improve the operating efficiency of saturated steam pipeline networks, enhance the utilization benefits of saturated steam, and generate significant economic value.

[0005] To address the aforementioned technical problems, this invention proposes a saturated steam pipeline network operation system, comprising a steam pipeline network and steam generation points, steam consumption points, a saturated steam power generation unit, and a steam accumulator connected to the steam pipeline network.

[0006] Each steam generation point is equipped with a first regulating valve on the connecting pipe to the steam network.

[0007] Each steam point for production is connected to the steam network by a flow control device.

[0008] The saturated steam power generation unit includes multiple steam turbine units. A second regulating valve and a third regulating valve are installed on the connecting pipe between the saturated steam power generation unit and the steam pipeline network. The second regulating valve is located upstream of the third regulating valve. The third regulating valve is used to control the steam turbine inlet pressure to stabilize, and the second regulating valve is used to control the steam pipeline network pressure to stabilize.

[0009] Optionally, the opening degree of the first regulating valve is such that the pressure in the steam pipeline is greater than the steam pressure output by the regulating valve.

[0010] Optionally, the first to third regulating valves are electric regulating valves or pneumatic regulating valves.

[0011] Optionally, the flow control device is a throttling orifice plate or a flow control regulating valve.

[0012] Optionally, when the steam network pressure fluctuates within the pressure fluctuation range, the steam network pressure and flow rate are kept stable by adjusting the turbine load of the saturated steam power generation unit;

[0013] The steam accumulator is connected to the steam pipeline network by a steam charging pipe and a steam discharging pipe. When the turbine load adjustment cannot guarantee that the pressure fluctuation of the steam pipeline network is within the pressure fluctuation range, the steam accumulator unit charges and discharges steam to ensure the stability of the steam pipeline network pressure and flow.

[0014] Optionally, for steam production points where steam production is unstable or intermittent, a steam accumulator can be installed on the steam source side.

[0015] Optionally, the third regulating valve is used to control the stability of the turbine inlet steam pressure, and the second regulating valve is used to control the stability of the steam network pressure, including: the third regulating valve adjusting its opening degree according to the turbine load, and the second regulating valve adjusting its opening degree according to the steam network pressure.

[0016] Optionally, the pressure fluctuation range is ±0.3 MPa.

[0017] This application is based on the integrated and coordinated consideration of source-grid-load-storage for the operation and control of saturated steam pipeline networks in steel enterprises, ensuring stable operating pressure of the steam pipeline network, preventing venting, improving steam utilization efficiency, and guaranteeing the quality of steam supply to steam consumption points. The control system coordinates the steam inlet and outlet of steam at steam generation points, production steam consumption points, surplus saturated steam power generation units, and steam accumulator units within the steel enterprise's steam pipeline network. The steam production point control involves installing necessary regulating measures on the steam pipelines supplying steam from the production points. For steam source points with unstable steam production, necessary heat storage measures should be installed within the internal system of the production point to ensure a stable steam supply and that the steam quality meets the requirements of the steam-consuming points. The production steam consumption point control involves installing necessary flow control measures on the steam inlet pipelines of the production steam consumption points based on production steam demand to ensure the steam flow supply during use and to avoid large and unpredictable fluctuations in pipeline network pressure. The surplus saturated steam power generation unit control involves installing dual regulating valves on the steam inlet pipelines of the saturated steam power generation turbine in the surplus saturated steam power generation unit. The regulating valve closer to the turbine side controls the stability of the turbine inlet steam pressure, ensuring the turbine operating efficiency under different load conditions. The regulating valve closer to the pipeline network side needs to be quickly adjusted according to the steam pipeline network pressure to ensure the stability of the steam pipeline network pressure. The steam accumulator unit control involves installing steam accumulators as needed at necessary locations in the pipeline network. When steam flow fluctuations are large and turbine load adjustments cannot guarantee stable pipeline network pressure, steam is charged and released through the steam accumulators to ensure that the steam pipeline network operates within a smaller pressure fluctuation range. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the saturated steam pipeline network operation system according to an embodiment of the present invention. Detailed Implementation

[0019] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This invention proposes a saturated steam pipeline network operation system, which is based on the integrated and coordinated consideration of source-network-load-storage for the operation and control of saturated steam pipeline networks in steel enterprises, and sets necessary control and regulation measures on the pipeline network system. It includes a steam pipeline network 100, and steam generation points 1, production steam consumption points 2, saturated steam power generation units 3, and steam accumulators 4 connected to the steam pipeline network 100.

[0021] There can be multiple steam generation points 1. Each steam generation point is connected to the steam network 100 by a first regulating valve 5, which can be an electric or pneumatic regulating valve. The first regulating valve 5 is interlocked with the steam output flow rate of the steam generation point to ensure a stable output of external steam under the back pressure of the steam network. Specifically, the opening degree of the first regulating valve 5 controls the output steam flow rate of the first regulating valve 5, so that the pressure of the steam network is greater than the output steam pressure of the first regulating valve 5, thereby ensuring a stable output of steam pressure under the back pressure of the steam network.

[0022] In addition, it should be noted that for steam production point 1, which has unstable or intermittent steam production, such as converter vaporization cooling steam production, necessary heat storage devices can be installed on the steam source side to ensure stable steam output from steam production point 1.

[0023] There can be multiple steam consumption points 2, and a flow control device 8 is installed on the connecting pipe between each steam consumption point and the steam network. This device can be an orifice plate, a flow control regulating valve, etc. Based on the steam demand for production, the steam flow can be controlled and predicted when the valve is opened at the steam consumption point. This avoids large and unpredictable fluctuations in the network pressure, preventing the saturated steam generator unit from being unable to quickly reduce load and adapt to a new steam balance.

[0024] The saturated steam power generation unit 3 can be multiple, and each saturated steam power generation unit 3 can be a steam turbine unit. Two regulating valves, namely a second regulating valve 7 and a third regulating valve 6, are installed on the connecting pipe between the saturated steam power generation unit 3 and the steam pipeline network. The second regulating valve 7 is located upstream of the third regulating valve 6. The third regulating valve 6, closer to the steam turbine side, is used to control the stability of the steam turbine inlet pressure, ensuring the turbine's operating efficiency under different load conditions. The second regulating valve 7, closer to the steam pipeline network side, adjusts rapidly with the steam pipeline network pressure to ensure its stability. Steam flow balance under different steam usage regimes is primarily ensured through steam turbine load adjustments. Specifically, for example, if the steam pressure in the steam pipeline network increases, the opening of the second regulating valve 7 will be larger, supplying more steam to the saturated steam power generation unit 3; if the steam pressure in the pipeline network decreases, the opening of the second regulating valve 7 will be smaller, supplying less steam to the saturated steam power generation unit 3. For example, if the steam turbine load decreases, the opening of the third regulating valve 6 will be smaller; if the steam turbine load increases, the opening of the third regulating valve 6 will be larger.

[0025] The steam accumulator unit 4 is a steam accumulator installed on the steam pipeline network, connected to the network by a steam charging pipe and a steam discharging pipe. When steam flow fluctuations are large and turbine load adjustment cannot guarantee stable pipeline pressure and flow, the steam accumulator unit 4 charges and discharges steam to ensure the steam pipeline network operates within a smaller pressure fluctuation range. For systems with small steam pipeline network pressure fluctuations, where turbine load adjustment of the saturated steam power generation unit can meet the pipeline flow regulation needs, a steam accumulator may not be necessary.

[0026] For example, if the steam pressure in the steam network rapidly drops from 1 MPa to 0.5 MPa, the steam accumulator unit 4 will supply steam to the steam network through the charging pipe. If the steam pressure in the steam network rapidly rises from 1 MPa to 1.5 MPa, the steam network will supply steam to the steam accumulator unit 4 through the venting pipe. If the steam pressure in the steam network drops from 1 MPa to 0.098 MPa, the steam accumulator unit 4 will not operate, and the saturated steam power generation unit 3 will reduce the turbine load. If the steam pressure in the steam network rises from 1 MPa to 1.02 MPa, the steam accumulator unit 4 will not operate, and the saturated steam power generation unit 3 will increase the turbine load.

[0027] The capacity selection of the steam accumulator unit 4 is strongly related to pipeline pressure fluctuations and flow balance. When selecting the capacity of the steam accumulator unit 4, it is necessary to ensure that pipeline pressure fluctuations are as small as possible under various operating conditions, and the pressure fluctuations can be controlled within ±0.3MPa.

[0028] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications are all within the protection scope of the claims of the present invention.

Claims

1. A saturated steam pipeline network operation system, characterized in that, This includes the steam pipeline network and the steam generation points, production steam consumption points, saturated steam power generation units, and steam accumulators connected to the steam pipeline network. Each steam generation point is equipped with a first regulating valve on the connecting pipe to the steam network. Each steam point for production is connected to the steam network by a flow control device. The saturated steam power generation unit includes multiple steam turbine units. A second regulating valve and a third regulating valve are installed on the connecting pipe between the saturated steam power generation unit and the steam network. The second regulating valve is located upstream of the third regulating valve. The third regulating valve is used to control the stability of the steam turbine inlet pressure, while the second regulating valve is used to control the stability of the steam network pressure. The opening degree of the first regulating valve makes the pressure in the steam pipeline network greater than the steam pressure output by the regulating valve.

2. The saturated steam pipeline network operation system according to claim 1, characterized in that, The first to the third regulating valves are electric regulating valves or pneumatic regulating valves.

3. The saturated steam pipeline network operation system according to claim 1, characterized in that, The flow control device is a throttling orifice plate or a flow control regulating valve.

4. The saturated steam pipeline network operation system according to claim 1, characterized in that, When the pressure fluctuation of the steam pipeline network is within the pressure fluctuation range, the pressure and flow of the steam pipeline network are kept stable by adjusting the turbine load of the saturated steam power generation unit; The steam accumulator is connected to the steam pipeline network by a steam charging pipe and a steam discharging pipe. When the turbine load adjustment cannot guarantee that the pressure fluctuation of the steam pipeline network is within the pressure fluctuation range, the steam accumulator unit charges and discharges steam to ensure the stability of the steam pipeline network pressure and flow.

5. The saturated steam pipeline network operation system according to claim 1, characterized in that, For steam production points that are unstable or intermittent, a steam accumulator is installed on the steam source side.

6. The saturated steam pipeline network operation system according to claim 1, characterized in that, The third regulating valve is used to control the stability of the steam turbine inlet pressure, and the second regulating valve is used to control the stability of the steam pipeline pressure. This means: The third regulating valve adjusts its opening degree according to the turbine load, while the second regulating valve adjusts its opening degree according to the steam network pressure.

7. The saturated steam pipeline network operation system according to claim 4, characterized in that, The pressure fluctuation range is ±0.3 MPa.

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