Saturated steam pipe network operation system

Abstract

The invention provides a saturated steam pipe network operation system which comprises a steam pipe network, and steam production points, production steam consumption points, a saturated steam power generation unit and a steam heat accumulator which are connected to the steam pipe network, and a connecting pipeline between each steam production point and the steam pipe network is provided with a first regulating valve; wherein a flow control device is mounted on a connecting pipeline between each production steam point and the steam pipe network; wherein the saturated steam power generation unit comprises a plurality of steam turbine sets, a second adjusting valve and a third adjusting valve are arranged on a connecting pipeline of the saturated steam power generation unit and the steam pipe network, the second adjusting valve is located on the upstream of the third adjusting valve, and the third adjusting valve is used for controlling steam inlet pressure of steam turbines to be stable. And the second regulating valve is used for controlling the stability of the pressure of the steam pipe network. According to the method, the operation control of the saturated steam pipe network of the iron and steel enterprise is cooperatively considered based on source-network-load-storage integration, and the stable operation pressure of the steam pipe network is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of steam pipe network utilization, and in particular, relates to a saturated steam pipe network operation system. Background Art

[0002] The saturated steam system is one of the main energy medium systems of steel enterprises. Improving the transportation and operation efficiency of saturated steam pipelines is of great significance to reducing the energy consumption of steel enterprises.

[0003] There are many problems in the operation of saturated steam pipelines in steel enterprises. Steam production points, steam use points, and saturated steam power generation units are usually dispersed in different areas of the steel plant. Distributed control is adopted. During the operation of the pipeline network, problems such as loss of pressure and release often occur due to poor coordination, resulting in waste of saturated steam resources and low steam utilization efficiency. In addition, due to the characteristics of the process production of steel enterprises, there are fluctuations in steam production and use, and the steam pressure and flow of the pipeline network fluctuate greatly. Release and other problems often occur, which pose challenges to the safe and stable operation of the saturated steam pipeline network. Summary of the invention

[0004] In view of the above problems, the present invention proposes a high-efficiency operation control method for a saturated steam pipeline network of a steel production enterprise, which can improve the operation efficiency of the saturated steam pipeline network, improve the utilization efficiency of saturated steam, and generate good economic value.

[0005] In order to solve the above technical problems, the present invention proposes a saturated steam pipe network operation system, including a steam pipe network and a steam production point, a production steam point, a saturated steam power generation unit, and a steam accumulator connected to the steam pipe network.

[0006] Wherein, a first regulating valve is installed on the connecting pipeline between each steam production point and the steam network;

[0007] Among them, a flow control device is installed on the connecting pipe between each production steam point and the steam network;

[0008] Among them, the saturated steam power generation unit includes multiple steam turbine units, and a second regulating valve and a third regulating valve are arranged on the connecting pipeline 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 turbine steam inlet pressure, and the second regulating valve is used to control the stability of the steam network pressure.

[0009] Optionally, the opening of the first regulating valve makes the pressure of the steam network 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 pressure fluctuation of the steam network is within the pressure fluctuation range, the pressure and flow of the steam network are kept stable by adjusting the steam turbine load of the saturated steam power generation unit;

[0013] A steam charging pipe and a steam discharging pipe are connected between the steam accumulator and the steam network. When the turbine load adjustment cannot ensure that the pressure fluctuation of the steam network is within the pressure fluctuation range, steam is charged and discharged through the steam accumulator unit to ensure the stability of the pressure and flow of the steam network.

[0014] Optionally, for steam production points with unstable or intermittent steam production, a steam accumulator is provided on the steam source side.

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

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

[0017] This application is based on the integrated coordination of source-grid-load-storage to consider the operation control of the saturated steam network of the steel enterprise, to ensure the stable operation pressure of the steam network, without release, to improve the efficiency of steam utilization, and to ensure the quality of steam supply at the steam point. The control system is a coordinated control of the steam in and out of the steam production point, production steam point, rich saturated steam power generation unit, and steam accumulator unit of the steam network of the steel enterprise. The steam production point control is to set necessary adjustment measures on the steam pipeline of the steam production point. For the steam source point with unstable steam production, necessary heat storage measures should be set in the internal system of the steam production point to ensure stable steam supply and steam quality that meets the requirements of the steam point; the production steam point control is to set necessary flow control measures on the steam inlet pipeline of the production steam point based on the production steam demand to ensure the steam flow supply during use and avoid large and unpredictable fluctuations in the pipeline network pressure; the rich saturated steam power generation unit control is to set double regulating gates on the steam inlet pipeline of the saturated steam power generation turbine of the rich saturated steam power generation unit. The regulating gate close to the turbine side controls the stable steam inlet pressure of the turbine to ensure the operation efficiency of the turbine under different load conditions. The regulating gate close to the pipeline network side needs to be adjusted quickly with the steam pipeline network pressure to ensure the stability of the steam pipeline network pressure. The steam accumulator unit control is to set the steam accumulator as needed at the necessary position of the pipeline network. When the steam flow fluctuation is relatively large and the turbine load adjustment cannot ensure the stability of the pipeline network pressure, the steam is charged and discharged through the steam accumulator to ensure that the steam pipeline network operates within a smaller pressure fluctuation range. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of a saturated steam pipeline operation system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The present invention proposes a saturated steam network operation system, which considers the operation control of the saturated steam network of a steel enterprise based on the integrated coordination of source-network-load-storage, and sets necessary control and adjustment measures on the network system. It includes a steam network 100, and a steam production point 1 connected to the steam network 100, a production steam point 2, a saturated steam power generation unit 3, and a steam accumulator 4.

[0021] There may be multiple steam production points 1, and a first regulating valve 5 is installed on the connecting pipeline between each steam production point and the steam network 100, which may be an electric regulating valve or a pneumatic regulating valve. The first regulating valve 5 is interlocked with the steam flow output from the steam production point to ensure the stable output of external steam under the back pressure of the steam network. Specifically, it means that the steam flow output from the first regulating valve 5 is controlled by the opening of the first regulating valve 5, so that the pressure of the steam network is greater than the steam pressure output by the first regulating valve 5, so that the steam pressure output by the first regulating valve 5 is stably output under the back pressure of the steam network.

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

[0023] There may be multiple production steam points 2, and a flow control device 8 is installed on the connecting pipe between each production steam point and the steam network, which may be a throttling orifice plate, a flow control regulating valve, etc. The steam flow can be controllable and predictable when the valve is opened at the steam point to use steam in combination with the demand for production steam, while avoiding large and unpredictable fluctuations in the network pressure, and the saturated steam generator set cannot quickly reduce the load to adapt to the new steam balance.

[0024] There may be multiple saturated steam power generation units 3, and the saturated steam power generation units 3 may be steam turbine units. Two regulating valves, namely, a second regulating valve 7 and a third regulating valve 6, are arranged on the connecting pipeline between the saturated steam power generation unit 3 and the steam network, and the second regulating valve 7 is located upstream of the third regulating valve 6. The third regulating valve 6 near the steam turbine side is used to control the stability of the steam inlet pressure of the steam turbine to ensure the operation efficiency of the steam turbine under different load conditions. The second regulating valve 7 near the steam network side is adjusted rapidly with the pressure of the steam network to ensure the stability of the pressure of the steam network. The steam flow balance under different steam use systems is preferentially guaranteed by adjusting the load of the steam turbine. Specifically, for example, if the steam pressure of the steam network increases, the opening of the second regulating valve 7 is larger, and more steam is delivered to the saturated steam power generation unit 3; if the steam pressure of the network decreases, the opening of the second regulating valve 7 is smaller, and less steam is delivered to the saturated steam power generation unit 3. For example, if the load of the steam turbine decreases, the opening of the third regulating valve 6 is reduced, and if the load of the steam turbine increases, the opening of the third regulating valve 6 is increased.

[0025] The steam accumulator unit 4 is a steam accumulator arranged on the steam network, and a steam charging pipe and a steam discharging pipe are connected between the steam accumulator and the steam network. When the steam flow fluctuation is relatively large and the turbine load adjustment cannot ensure the stability of the network pressure and flow, the steam is charged and discharged through the steam accumulator unit 4 to ensure that the steam network operates within a smaller pressure fluctuation range. For systems with small pressure fluctuations in the steam network, the load adjustment of the saturated steam power generation unit turbine can meet the needs of network flow adjustment, and the steam accumulator may not be set.

[0026] For example, if the steam pressure of the steam network drops rapidly from 1Mpa to 0.5Mpa, the steam accumulator unit 4 delivers steam to the steam network through the steam charging pipe. For example, if the steam pressure of the steam network rises rapidly from 1Mpa to 1.5Mpa, the steam network delivers steam to the steam accumulator unit 4 through the steam discharge pipe. If the steam pressure of the steam network drops from 1Mpa to 0.098Mpa, the steam accumulator unit 4 does not work, and the saturated steam power generation unit 3 reduces the turbine load. For example, if the steam pressure of the steam network rises from 1Mpa to 1.02Mpa, the steam accumulator unit 4 does not work, and the saturated steam power generation unit 3 increases the turbine load.

[0027] The capacity selection of the steam accumulator unit 4 is closely related to the pipe network pressure fluctuation and flow balance. When selecting the capacity of the steam accumulator unit 4, the pipe network pressure fluctuation under various working conditions should be as small as possible, and the pressure fluctuation can be controlled within ±0.3MPa.

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

Claims

1. A saturated steam pipe network operation system, characterized in that: It includes the steam network and the steam production points, production steam points, saturated steam power generation units, and steam accumulators connected to the steam network. Wherein, a first regulating valve is installed on the connecting pipeline between each steam production point and the steam network; Among them, a flow control device is installed on the connecting pipe between each production steam point and the steam network; Among them, the saturated steam power generation unit includes multiple steam turbine units, and a second regulating valve and a third regulating valve are arranged on the connecting pipeline 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 turbine steam inlet pressure, and the second regulating valve is used to control the stability of the steam network pressure.

2. The saturated steam pipe network operation system according to claim 1, characterized in that: The opening degree of the first regulating valve makes the pressure of the steam network greater than the steam pressure output by the regulating valve.

3. The saturated steam pipe network operation system according to claim 1, characterized in that: The first to third regulating valves are electric regulating valves or pneumatic regulating valves.

4. The saturated steam pipe 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.

5. The saturated steam pipe network operation system according to claim 1, characterized in that: When the pressure fluctuation of the steam network is within the pressure fluctuation range, the pressure and flow of the steam network are kept stable by adjusting the turbine load of the saturated steam power generation unit; A steam charging pipe and a steam discharging pipe are connected between the steam accumulator and the steam network. When the turbine load adjustment cannot ensure that the pressure fluctuation of the steam network is within the pressure fluctuation range, the steam is charged and discharged through the steam accumulator unit to ensure the stability of the pressure and flow of the steam network.

6. The saturated steam pipe network operation system according to claim 1, characterized in that: For steam production points with unstable or intermittent steam production, a steam accumulator is provided on the steam source side.

7. The saturated steam pipe 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 network pressure, which means: The third regulating valve adjusts its opening according to the load of the steam turbine, and the second regulating valve adjusts its opening according to the pressure of the steam network.

8. The saturated steam pipe network operation system according to claim 5, characterized in that: The pressure fluctuation range is ±0.3Mpa.

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