Efficient and stable industrial steam supply system suitable for wide-load operation of thermal power generating unit

Abstract

The invention discloses an efficient and stable industrial steam supply system suitable for wide-load operation of a thermal power generating unit. According to the system, in an adjusting unit, the first end of a first steam inlet shut-off valve is connected with the first end of a second steam inlet shut-off valve and connected with the steam inlet end of the adjusting unit; the second end of the first steam inlet shut-off valve is connected with the steam inlet end of the first adjusting unit, and the steam exhaust end of the first adjusting unit is connected with the first end of the first steam exhaust shut-off valve. The second end of the second steam inlet shut-off valve is connected with the steam inlet end of the second adjusting unit, and the steam exhaust end of the second adjusting unit is connected with the first end of the second steam exhaust shut-off valve. The second end of the first steam exhaust shut-off valve is connected with the second end of the second steam exhaust shut-off valve and connected with the steam exhaust end of the adjusting unit. The first adjusting unit is used for steam pressurization; the second adjusting unit is used for generating electricity through steam. According to the steam supply system, input steam is adjusted through the adjusting unit, accurate control over steam parameters can be achieved through the system, and energy waste is reduced.

Description

Technical Field

[0001] The present invention relates to the field of industrial steam supply in electric power technology, and in particular to a highly efficient and stable industrial steam supply system suitable for wide load operation of thermal power units. Background Art

[0002] The mainstream domestic heating units are mainly 300MW and 600MW units. The heating units mainly use main steam or reheat steam pressure reduction technology to provide safe and stable industrial heat load.

[0003] In the existing technology, the scheme of reducing steam pressure for heating is to reduce the pressure of high-quality primary steam to obtain secondary steam with the required pressure. This scheme has a large throttling loss, which will cause waste of high-quality energy and does not conform to the principle of energy cascade utilization. At the same time, when the main steam is reduced pressure, there are problems such as limited steam extraction and low heat supply. The scheme of reducing temperature and pressure of reheated steam has problems such as insufficient steam supply pressure and substandard steam supply parameter quality under deep adjustment conditions. Summary of the invention

[0004] The present invention provides an efficient and stable industrial steam supply system suitable for wide load operation of thermal power units, so as to solve the problems of slow regulation response to input steam, energy waste in the regulation process and unsatisfactory steam pressure regulation effect in the current industrial steam supply system.

[0005] According to one aspect of the present invention, there is provided an efficient and stable industrial steam supply system suitable for wide load operation of thermal power units, comprising: a steam inlet unit, a regulating unit and a steam exhaust unit;

[0006] The exhaust end of the steam inlet unit is connected to the steam inlet end of the regulating unit, and the exhaust end of the regulating unit is connected to the steam inlet end of the steam exhaust unit;

[0007] The regulating unit comprises: a first regulating unit, a second regulating unit, a first steam inlet shut-off valve, a first steam exhaust shut-off valve, a second steam inlet shut-off valve and a second steam exhaust shut-off valve;

[0008] The first end of the first steam inlet shut-off valve is connected to the first end of the second steam inlet shut-off valve and is connected to the steam inlet end of the regulating unit;

[0009] The second end of the first steam inlet shut-off valve is connected to the steam inlet end of the first regulating unit, and the exhaust end of the first regulating unit is connected to the first end of the first steam exhaust shut-off valve;

[0010] The second end of the second steam inlet shut-off valve is connected to the steam inlet end of the second regulating unit, and the exhaust end of the second regulating unit is connected to the first end of the second steam exhaust shut-off valve;

[0011] The second end of the first exhaust shut-off valve is connected to the second end of the second exhaust shut-off valve and is connected to the exhaust end of the regulating unit;

[0012] The first regulating unit is used to pressurize the steam input to the regulating unit; the second regulating unit is used to depressurize the steam input to the regulating unit and generate electricity using the steam.

[0013] Optionally, the steam inlet unit comprises: a first steam system steam source regulating valve and a second steam system steam source regulating valve;

[0014] The first end of the steam source regulating valve of the first steam system is connected to the first steam inlet end of the steam inlet unit and is connected to the exhaust end of the first steam system of the thermal power unit;

[0015] The first end of the steam source regulating valve of the second steam system is connected to the second steam inlet end of the steam inlet unit and is connected to the exhaust end of the second steam system of the thermal power unit;

[0016] The second end of the first steam system steam source regulating valve is connected to the second end of the second steam system steam source regulating valve and is connected to the exhaust end of the steam inlet unit.

[0017] Optionally, the steam exhaust unit includes: a steam supply parameter measuring meter and / or a flow meter;

[0018] The sampling point of the steam supply parameter measuring meter is connected to the exhaust end of the regulating unit; and / or the first end of the flow meter is connected to the exhaust end of the regulating unit, and the second end of the flow meter is connected to the exhaust end of the exhaust unit;

[0019] The data output end of the steam supply parameter measuring meter and / or the flow meter is connected to the data input end of the distributed control device;

[0020] The distributed control device is used to control the opening of the first steam system steam source regulating valve and the second steam system steam source regulating valve according to the data collected by the steam supply parameter measuring meter and / or the flow meter;

[0021] The steam exhaust unit further comprises: a steam supply safety valve;

[0022] The first end of the steam supply safety valve is connected to the steam inlet end of the steam exhaust unit, and the second end of the steam supply safety valve is connected to the steam exhaust end of the steam exhaust unit.

[0023] Optionally, the steam inlet unit further includes: a shut-off valve for a steam source from the first steam system, a check valve for a steam source from the first steam system, a shut-off valve for a steam source from the second steam system, and a check valve for a steam source from the second steam system;

[0024] The first end of the first steam system steam source shut-off valve is connected to the second end of the first steam system steam source regulating valve, the second end of the first steam system steam source shut-off valve is connected to the first end of the first steam system steam source check valve, and the second end of the first steam system steam source check valve is connected to the exhaust end of the steam inlet unit;

[0025] The first end of the second steam system steam source shut-off valve is connected to the second end of the second steam system steam source regulating valve, the second end of the second steam system steam source shut-off valve is connected to the first end of the second steam system steam source check valve, and the second end of the second steam system steam source check valve is connected to the exhaust end of the steam inlet unit.

[0026] Optionally, the regulating unit further includes: a first exhaust steam check valve and a second exhaust steam check valve;

[0027] The first end of the first exhaust check valve is connected to the exhaust end of the first regulating unit, and the second end of the first exhaust check valve is connected to the first end of the first exhaust shut-off valve;

[0028] The first end of the second exhaust check valve is connected to the exhaust end of the second regulating unit, and the second end of the second exhaust check valve is connected to the first end of the second exhaust shut-off valve.

[0029] Optionally, it also includes: a bypass steam supply unit;

[0030] The first end of the bypass steam supply unit is connected to the exhaust end of the steam inlet unit, and the second end of the bypass steam supply unit is connected to the steam inlet end of the exhaust unit;

[0031] The bypass steam supply unit includes a bypass shut-off valve; a first end of the bypass shut-off valve is connected to a first end of the bypass steam supply unit, and a second end of the bypass shut-off valve is connected to a second end of the bypass steam supply unit.

[0032] Optionally, the first regulating unit and the second regulating unit are integrated turbines, and the turbines are used to pressurize and depressurize steam and generate electricity using steam;

[0033] Alternatively, the first regulating unit is a steam booster, and the second regulating unit is a back pressure generator.

[0034] According to another aspect of the present invention, there is provided a method for efficiently and stably supplying industrial steam to a thermal power unit under wide load conditions, which is applied to a system for efficiently and stably supplying industrial steam to a thermal power unit under wide load conditions in any embodiment of the present invention. The method for efficiently and stably supplying industrial steam to a thermal power unit under wide load conditions comprises:

[0035] Obtaining the load rate of the thermal power unit and the steam parameters of the steam introduced into the steam inlet unit; the steam parameters include steam pressure;

[0036] When the load rate of the thermal power unit is greater than a preset threshold or the steam parameter is greater than a preset threshold, the first steam inlet shut-off valve and the first steam exhaust shut-off valve are controlled to be closed, and the second steam inlet shut-off valve and the second steam exhaust shut-off valve are controlled to be opened;

[0037] When the load rate of the thermal power unit is less than a preset threshold or the steam parameter is less than a preset threshold, the second steam inlet shut-off valve and the second steam exhaust shut-off valve are controlled to be closed, and the first steam inlet shut-off valve and the first steam exhaust shut-off valve are controlled to be opened.

[0038] Optionally, the efficient and stable industrial steam supply method suitable for wide load operation of thermal power units also includes: obtaining the steam supply parameter of the exhaust unit, and when the steam supply parameter is greater than the steam supply parameter threshold, controlling the steam inlet flow rate of the steam inlet unit to be reduced; when the steam supply parameter is less than the steam supply parameter threshold, controlling the steam inlet flow rate of the steam inlet unit to be increased; the steam supply parameter is the steam supply flow rate.

[0039] Optionally, after obtaining the load rate of the thermal power unit and the steam parameters of the steam introduced into the steam inlet unit, the method further includes:

[0040] When the load rate of the thermal power unit is equal to a preset threshold or the steam parameter is equal to a preset threshold, controlling the bypass steam supply unit to be turned on;

[0041] Wherein, the first end of the bypass steam supply unit is connected to the exhaust end of the steam inlet unit, and the second end of the bypass steam supply unit is connected to the steam inlet end of the exhaust unit; the bypass steam supply unit includes a bypass shut-off valve; the first end of the bypass shut-off valve is connected to the first end of the bypass steam supply unit, and the second end of the bypass shut-off valve is connected to the second end of the bypass steam supply unit.

[0042] The embodiment of the present invention provides an efficient and stable industrial steam supply system suitable for wide load operation of thermal power units, wherein in the industrial steam supply system, the second regulating unit is used to reduce the pressure of steam input to the regulating unit and use the steam to generate electricity. The steam inlet shut-off valve and the exhaust shut-off valve of the regulating unit are turned on and off to adjust the direction of the steam in the regulating unit. The regulating unit includes a first regulating unit and a second regulating unit, and the first regulating unit is used to pressurize the steam input to the regulating unit. The industrial steam supply system in the embodiment of the present invention can effectively improve the industrial steam supply capacity of the steam supply system by setting two groups of regulating units to pressurize or reduce the pressure of steam respectively. The industrial steam supply system of the present invention can cope with the steam demand under different working conditions, and realize the precise control of steam parameters by configuring the regulating unit and the shut-off valve. At the same time, the second regulating unit in the embodiment of the present invention is used to reduce the pressure of steam input to the regulating unit and use the steam to generate electricity, realizing energy reuse, reducing energy waste, and improving the overall energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 A schematic diagram of the structure of an efficient and stable industrial steam supply system suitable for wide load operation of thermal power units provided by an embodiment of the present invention;

[0045] Figure 2 A schematic diagram of the structure of another efficient and stable industrial steam supply system suitable for wide load operation of thermal power units provided by an embodiment of the present invention;

[0046] Figure 3 A schematic diagram of the structure of another efficient and stable industrial steam supply system suitable for wide load operation of thermal power units provided by an embodiment of the present invention;

[0047] Figure 4 A schematic diagram of the structure of another efficient and stable industrial steam supply system suitable for wide load operation of thermal power units provided by an embodiment of the present invention;

[0048] Figure 5 A schematic diagram of the structure of another efficient and stable industrial steam supply system suitable for wide load operation of thermal power units provided by an embodiment of the present invention;

[0049] Figure 6 A schematic diagram of the structure of another efficient and stable industrial steam supply system suitable for wide load operation of thermal power units provided by an embodiment of the present invention;

[0050] Figure 7 A schematic diagram of the structure of another efficient and stable industrial steam supply system suitable for wide load operation of thermal power units provided by an embodiment of the present invention;

[0051] Figure 8 A flow chart of an efficient and stable industrial steam supply method applicable to wide load operation of thermal power units provided by an embodiment of the present invention;

[0052] Fig. 9 A flow chart of another efficient and stable industrial steam supply method applicable to wide load operation of thermal power units provided by an embodiment of the present invention;

[0053] Fig.10 A flow chart of another efficient and stable industrial steam supply method suitable for wide load operation of thermal power units provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0054] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0055] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0056] Figure 1 A structural diagram of an efficient and stable industrial steam supply system suitable for wide load operation of thermal power units provided by an embodiment of the present invention is shown in FIG. Figure 1As shown, the efficient and stable industrial steam supply system suitable for wide load operation of thermal power units includes: a steam inlet unit 101, a regulating unit 102 and a steam exhaust unit 103; the exhaust end of the steam inlet unit 101 is connected to the steam inlet end of the regulating unit 102, and the exhaust end of the regulating unit 102 is connected to the steam inlet end of the exhaust unit 103; the regulating unit 102 includes: a first regulating unit 10211, a second regulating unit 10221, a first steam inlet shut-off valve 10212, a first exhaust steam shut-off valve 10213, a second steam inlet shut-off valve 10222 and a second exhaust steam shut-off valve 10223; the first end of the first steam inlet shut-off valve 10212 and the first end of the second steam inlet shut-off valve 10222 are connected to the steam inlet end of the regulating unit 102; the first steam inlet shut-off valve 1021 2 is connected to the steam inlet end of the first regulating unit 10211, and the exhaust end of the first regulating unit 10211 is connected to the first end of the first exhaust steam shut-off valve 10213; the second end of the second steam inlet shut-off valve 10222 is connected to the steam inlet end of the second regulating unit 10221, and the exhaust end of the second regulating unit 10221 is connected to the first end of the second exhaust steam shut-off valve 10223; the second end of the first exhaust steam shut-off valve 10213 is connected to the second end of the second exhaust steam shut-off valve 10223 and to the exhaust end of the regulating unit 102; the first regulating unit 10211 is used to pressurize the steam input to the regulating unit 102; the second regulating unit 10221 is used to decompress the steam input to the regulating unit 102 and use the steam to generate electricity.

[0057] Specifically, in the steam inlet unit 101, the steam inlet unit 101 is the steam inlet part of the industrial steam supply system, which is used to receive steam from the steam source. Exemplarily, the steam inlet unit 101 receives steam from a boiler or a steam turbine. The steam source of the steam inlet unit 101 includes a steam source from a reheat system and a steam source from a steam turbine extraction system. Among them, the steam source from the reheat system is the steam heated by the reheater in the thermal power unit. In the large steam turbine of the thermal power unit, in order to improve the thermal efficiency and increase the steam working capacity, the steam will be extracted after the high-pressure cylinder works and sent to the reheater for reheating. The temperature and pressure of the heated steam are increased, and then sent back to the medium-pressure cylinder or the low-pressure cylinder to continue working. The steam source from the reheat system has the characteristics of high temperature and high pressure. The steam source from the steam turbine extraction system refers to part of the steam extracted from the intermediate stage or the last stage of the steam turbine of the thermal power unit. During the operation of the steam turbine, steam is extracted from different stages as needed for heating, power generation or other industrial production processes. The extracted steam usually has a higher temperature and pressure, and can meet the steam requirements of different industrial equipment after being regulated by the regulating unit 102. When the steam turbine extraction system is used as the steam source, the steam introduced into the industrial steam supply system has high flexibility and strong adaptability.

[0058] In the regulating unit 102, the first regulating unit 10211 is used to pressurize the steam input to the regulating unit 102. Optionally, the first regulating unit 10211 is a steam turbine and a supercharger. The second regulating unit 10221 is used to reduce the pressure of the steam input to the regulating unit 102, and use the steam in the decompression process to generate electricity. The second regulating unit 10221 not only reduces the pressure of the steam, but also realizes the cascade utilization of energy. Optionally, the second regulating unit 10221 is a pressure reducing valve and a generator. In the regulating unit 102, two steam inlet shut-off valves and two exhaust steam shut-off valves are also included. The corresponding steam inlet shut-off valve and exhaust steam shut-off valve control the direction of the steam in the regulating unit 102 by opening and closing. Exemplarily, when the first steam inlet shut-off valve 10212 and the first exhaust steam shut-off valve 10213 are opened and the second steam inlet shut-off valve 10222 and the second exhaust steam shut-off valve 10223 are closed, the steam in the regulating unit 102 is passed into the first regulating unit 10211 for pressurization; when the first steam inlet shut-off valve 10212 and the first exhaust steam shut-off valve 10213 are closed and the second steam inlet shut-off valve 10222 and the second exhaust steam shut-off valve 10223 are opened, the steam in the regulating unit 102 is passed into the second regulating unit 10221 for decompression and the steam is used to generate electricity.

[0059] In the exhaust unit 103, it is used to receive the steam processed by the regulating unit and deliver it to the industrial steam user. Exemplarily, the exhaust unit 103 is the last node of the industrial steam system. The steam supply parameter measurement point is set in the exhaust unit 103 to sample and detect the steam supply parameters, and the steam inlet unit 101 and the regulating unit 102 are adjusted according to the sampling results. The steam flow rate of the exhaust unit 103 is obtained. When the steam flow rate is greater than the preset threshold, it means that the steam flow rate introduced into the industrial steam supply system is too large, and the steam inlet unit 101 is adjusted to control the input steam flow rate to decrease; otherwise, the steam inlet unit 101 is adjusted to control the input steam flow rate to increase. The steam pressure of the exhaust unit 103 is obtained and compared with the expected steam pressure value after adjustment by the regulating unit 102. When the steam pressure is extremely high compared with the expected steam pressure, it means that the pressurization operation of the first regulating unit 10211 in the regulating unit 102 is excessive or the decompression operation of the second regulating unit 10221 is insufficient, and the operating power of the first regulating unit 10211 is reduced or the operating power of the second regulating unit 10221 is increased accordingly; otherwise, it means that the pressurization operation effect of the first regulating unit 10211 in the regulating unit 102 is insufficient or the decompression operation of the second regulating unit 10221 is excessive, and the operating power of the first regulating unit 10211 is increased or the operating power of the second regulating unit 10221 is reduced accordingly.

[0060] The embodiment of the present invention provides an efficient and stable industrial steam supply system suitable for wide load operation of thermal power units, wherein the second regulating unit is used to reduce the pressure of steam input to the regulating unit and use the steam to generate electricity. The steam inlet shut-off valve and the exhaust shut-off valve of the regulating unit are turned on and off to control the direction of the steam in the regulating unit. The regulating unit includes a first regulating unit and a second regulating unit, and the first regulating unit is used to pressurize the steam input to the regulating unit. The industrial steam supply system in the embodiment of the present invention can effectively improve the industrial steam supply capacity of the steam supply system by setting two groups of regulating units to pressurize or reduce the pressure of steam respectively. The industrial steam supply system of the present invention can cope with the steam demand under different working conditions, and realize the precise control of steam parameters by configuring the regulating unit and the shut-off valve. At the same time, the second regulating unit in the embodiment of the present invention is used to reduce the pressure of steam input to the regulating unit and use the steam to generate electricity, realizing energy reuse, reducing energy waste, and improving the overall energy utilization efficiency.

[0061] Based on the above embodiments, Figure 2 A structural diagram of another efficient and stable industrial steam supply system suitable for wide load operation of thermal power units provided by an embodiment of the present invention is shown in FIG. Figure 2 As shown, in the efficient and stable industrial steam supply system suitable for wide load operation of thermal power units, the steam inlet unit 101 includes: a first steam system steam source regulating valve 10111 and a second steam system steam source regulating valve 10121; a first end of the first steam system steam source regulating valve 10111 is connected to the first steam inlet end of the steam inlet unit 101 and to the exhaust end of the first steam system of the thermal power unit; a first end of the second steam system steam source regulating valve 10121 is connected to the second steam inlet end of the steam inlet unit 101 and to the exhaust end of the second steam system of the thermal power unit; a second end of the first steam system steam source regulating valve 10111 is connected to the second end of the second steam system steam source regulating valve 10121 and to the exhaust end of the steam inlet unit 101.

[0062] The exhaust unit 103 includes: a steam supply parameter measuring meter 1031 and / or a flow meter 1032; the sampling point of the steam supply parameter measuring meter 1031 is connected to the exhaust end of the regulating unit 102; and / or, the first end of the flow meter is connected to the exhaust end of the regulating unit 102, and the second end of the flow meter is connected to the exhaust end of the exhaust unit 103; the data output end of the steam supply parameter measuring meter 1031 and / or the flow meter 1032 is connected to the data input end of the distributed control device; the distributed control device is used to control the opening of the first steam system steam source regulating valve 10111 and the second steam system steam source regulating valve 10121 according to the data collected by the steam supply parameter measuring meter 1031 and / or the flow meter 1032;

[0063] The exhaust unit 103 further includes: a steam supply safety valve 1033 ; a first end of the steam supply safety valve 1033 is connected to the steam inlet end of the exhaust unit 103 , and a second end of the steam supply safety valve 1033 is connected to the steam exhaust end of the exhaust unit 103 .

[0064] Specifically, the steam inlet unit 101 includes two steam inlet ends. The two steam inlet ends are used to receive steam from the thermal power unit. The two steam source regulating valves of the steam inlet unit 101 are used to control the flow of steam. By adjusting the opening of the valve, the flow and pressure of the steam can be accurately controlled. The two steam inlet ends of the steam inlet unit 101 are connected to different steam sources. By adjusting the steam flow of the two steam systems, energy can be maximized and energy waste can be reduced. Optionally, the first steam inlet end of the steam inlet unit 101 is connected to the exhaust end of the reheat steam system of the thermal power unit; the second steam inlet end of the steam inlet unit 101 is connected to the exhaust end of the turbine extraction system of the thermal power unit.

[0065] In the exhaust unit 103, the steam supply parameter measuring meter 1031 and / or the flow meter 1032 are used to collect the steam parameters flowing through the exhaust unit 103, and the distributed control device (DCS device) adjusts the opening of the steam source regulating valve 10111 of the first steam system and the steam source regulating valve 10121 of the second steam system according to the collected steam parameters to obtain the industrial steam supply required by the user. The distributed control device can realize precise control of the steam supply to ensure that the flow of steam meets the needs of subsequent processes or equipment. When the steam demand of the steam supply end user of the industrial steam supply system is high, the industrial steam supply system can quickly increase the steam supply to meet the corresponding steam demand; when the steam demand is low, the industrial steam supply system can reduce the steam supply to avoid energy waste. This ability of rapid response and flexible adjustment helps to maintain the stable operation of the industrial steam supply system and improve the flexibility and reliability of the industrial steam supply system.

[0066] The steam supply safety valve 1033 of the exhaust unit 103 is used to prevent overpressure of the industrial steam supply system. When the steam pressure in the exhaust unit 103 exceeds the pressure threshold of the steam supply safety valve 1033, the steam supply safety valve 1033 is closed to stop the steam from entering.

[0067] Based on the above embodiments, Figure 3 A schematic diagram of another highly efficient and stable industrial steam supply system suitable for wide load operation of thermal power units provided by an embodiment of the present invention. Figure 4 A structural diagram of another efficient and stable industrial steam supply system suitable for wide load operation of thermal power units provided by an embodiment of the present invention is shown in FIG. Figure 3 and Figure 4As shown, in the efficient and stable industrial steam supply system suitable for wide load operation of thermal power units, the steam inlet unit 101 further includes: a first steam system steam source shut-off valve 10113, a first steam system steam source check valve 10114, a second steam system steam source shut-off valve 10123 and a second steam system steam source check valve 10124;

[0068] The first end of the first steam system steam source shut-off valve 10113 is connected to the second end of the first steam system steam source regulating valve 10111, the second end of the first steam system steam source shut-off valve 10113 is connected to the first end of the first steam system steam source check valve 10114, and the second end of the first steam system steam source check valve 10114 is connected to the exhaust end of the steam inlet unit 101;

[0069] The first end of the second steam system steam source shut-off valve 10123 is connected to the second end of the second steam system steam source regulating valve 10121, the second end of the second steam system steam source shut-off valve 10123 is connected to the first end of the second steam system steam source check valve 10124, and the second end of the second steam system steam source check valve 10124 is connected to the exhaust end of the steam inlet unit 101.

[0070] The regulating unit 102 further includes: a first exhaust steam check valve 10214 and a second exhaust steam check valve 10224;

[0071] The first end of the first exhaust check valve 10214 is connected to the exhaust end of the first regulating unit 10211, and the second end of the first exhaust check valve 10214 is connected to the first end of the first exhaust shut-off valve 10213;

[0072] The first end of the second exhaust steam check valve 10224 is connected to the exhaust end of the second regulating unit 10221 , and the second end of the second exhaust steam check valve 10224 is connected to the first end of the second exhaust steam shut-off valve 10223 .

[0073] Specifically, in the exhaust unit 101, the steam source shut-off valve includes: a first steam system steam source shut-off valve 10113 and a second steam system steam source shut-off valve 10123. The steam source shut-off valve is used to shut off the steam in the exhaust unit 101. The first steam system steam source shut-off valve 10113 and the second steam system steam source shut-off valve 10123 serve as safety and control devices, and can cut off the steam flow when needed. Exemplarily, in maintenance, overhaul or emergency situations, the flow of steam can be stopped by closing the first steam system steam source shut-off valve 10113 and / or the second steam system steam source shut-off valve 10123 to ensure the safety of the industrial steam supply system and the safety of operators.

[0074] Check valves are also included in the exhaust unit 101 and the regulating unit 102. The first exhaust check valve 10214 and the second exhaust check valve 1022 are used to prevent the steam in the regulating unit 102 from flowing back. In the industrial steam supply system, steam flows under high pressure. If the steam flows back due to system failure or pressure change, it will damage the system components or cause safety hazards. The first steam system steam source check valve 10114, the second steam system steam source check valve 10124, the first exhaust check valve 10214 and the second exhaust check valve 1022 are closed in the reverse direction, which can prevent the steam from flowing back and protect the system from damage.

[0075] Based on the above embodiments, Figure 5 A structural diagram of another efficient and stable industrial steam supply system suitable for wide load operation of thermal power units provided by an embodiment of the present invention is shown in FIG. Figure 5 As shown, the efficient and stable industrial steam supply system suitable for wide load operation of thermal power units also includes: a bypass steam supply unit 104; the first end of the bypass steam supply unit 104 is connected to the exhaust end of the steam inlet unit 101, and the second end of the bypass steam supply unit 104 is connected to the steam inlet end of the exhaust unit 103; the bypass steam supply unit 104 includes a bypass shut-off valve 1041; the first end of the bypass shut-off valve 1041 is connected to the first end of the bypass steam supply unit 104, and the second end of the bypass shut-off valve 1041 is connected to the second end of the bypass steam supply unit 104.

[0076] Specifically, the bypass steam supply unit 104 provides an additional steam flow path. When the bypass shut-off valve 1041 is opened, the bypass steam supply unit 104 is connected in parallel to the regulating unit. At this time, the steam can flow directly to the exhaust unit 103 without being processed by the regulating unit. For example, if the parameters of the steam turbine extraction system match the required industrial steam supply parameters, that is, there is no need to adjust the steam pressure of the steam source. The system can use the bypass steam supply unit 104 to improve efficiency: open the steam supply bypass shut-off valve 1041 and shut off the regulating unit 102 at the same time, and the steam can be directly supplied to the outside through the bypass steam supply unit 104. The bypass steam supply unit 104 increases the flexibility of the system, allowing the system to be adaptively adjusted according to changes in load and steam parameters. At the same time, by optimizing the steam flow path, the bypass steam supply unit 104 helps to reduce unnecessary energy consumption and emissions, which meets the requirements of modern industry for energy conservation and emission reduction.

[0077] Based on the above embodiments, Figure 6 A schematic diagram of another highly efficient and stable industrial steam supply system suitable for wide load operation of thermal power units provided by an embodiment of the present invention. Figure 7 Another structural diagram of an efficient and stable industrial steam supply system suitable for wide load operation of thermal power units provided by an embodiment of the present invention is as follows: Figure 6 ,7 As shown, in the efficient and stable industrial steam supply system suitable for wide load operation of thermal power units, the first regulating unit 10211 and the second regulating unit 10221 are integrated turbines, which are used to pressurize and decompress the steam and use the steam to generate electricity; or, the first regulating unit 10211 is a steam booster and the second regulating unit 10221 is a back-pressure generator.

[0078] Specifically, the steam inlet unit 101 receives steam sources from two steam systems, and uses the steam source regulating valve 10111 from the first steam system and the steam source regulating valve 10121 from the second steam system to control the steam flow, and then the steam is passed into the regulating unit 102, and the steam is passed into the corresponding regulating unit for pressure reduction or pressure increase by closing and opening the shutoff valve. Figure 6 As shown, the first regulating unit 10211 and the second regulating unit 10221 are integrated turbines 10231, which are used to pressurize and depressurize steam and use steam to generate electricity. The integrated turbine integrates steam pressurization, depressurization and power generation functions, reduces the equipment footprint and installation cost, and improves the overall performance and reliability of the system. Or, Figure 7 As shown, the first regulating unit 10211 is a steam booster 10232, and the second regulating unit 10221 is a back pressure generator 10233. As independent devices, the steam booster 10232 and the back pressure generator 10233 can be flexibly combined and adjusted according to production needs. This configuration improves the flexibility and adaptability of the system and can better meet the needs of different production scenarios. The steam regulated by the regulating unit 102 is discharged through the exhaust unit 103 and provided to the steam user. The bypass steam supply unit 104 provides an additional steam flow path. When the bypass shut-off valve 1041 is opened, the bypass steam supply unit 104 is connected in parallel to the regulating unit. At this time, the steam can flow directly to the exhaust unit 103 without being processed by the regulating unit.

[0079] Based on the above embodiments, Figure 8 The present invention provides a flow chart of an efficient and stable industrial steam supply method suitable for wide load operation of thermal power units. The present invention is used for industrial steam supply processing of steam. The present invention can be applied to any of the above embodiments of the efficient and stable industrial steam supply system suitable for wide load operation of thermal power units, such as Figure 8 As shown, the efficient and stable industrial steam supply method applicable to wide load operation of thermal power units provided by the embodiment of the present invention includes:

[0080] S201. Obtain the load rate of the thermal power unit and the steam parameters of the steam introduced into the steam inlet unit.

[0081] Among them, the steam parameters include steam pressure.

[0082] Specifically, Figures 1 to 8 As shown, the thermal power unit is the thermal power unit connected to the steam inlet unit 101. The steam sources of the steam inlet unit 101 include the steam source from the reheat system and the steam source from the steam turbine extraction system. Among them, the steam source from the reheat system is steam heated by the reheater. The steam source from the reheat system has the characteristics of high temperature and high pressure. The steam source from the steam turbine extraction system refers to part of the steam extracted from the middle stage or the last stage of the steam turbine. Among them, the reheat system and the steam turbine extraction system are the systems in the thermal power unit connected to the steam inlet unit 101. Obtain the load rate of the thermal power unit. When the load rate of the thermal power unit is high, the quality of the steam introduced into the steam inlet unit 101 is high; when the load rate of the thermal power unit is low, the quality of the steam introduced into the steam inlet unit 101 is low. Among them, the quality of steam is reflected in the pressure of steam. The steam parameters of the steam introduced into the steam inlet unit 101 can also be directly obtained to obtain the pressure of steam.

[0083] S202. When the load rate of the thermal power unit is greater than a preset threshold or the steam parameter is greater than a preset threshold, the first steam inlet shut-off valve and the first steam exhaust shut-off valve are controlled to be closed, and the second steam inlet shut-off valve and the second steam exhaust shut-off valve are controlled to be opened.

[0084] When the load rate of the thermal power unit is greater than the preset threshold or the steam parameter is greater than the preset threshold, it means that the steam pressure is high and the steam needs to be decompressed, so the first steam inlet shut-off valve 10212 and the first exhaust steam shut-off valve 10213 are controlled to be closed, and the second steam inlet shut-off valve 10222 and the second exhaust steam shut-off valve 10223 are controlled to be opened. The steam is passed into the second regulating unit 10221 to decompress the steam input to the regulating unit 102 and use the steam to generate electricity.

[0085] S203. When the load rate of the thermal power unit is less than a preset threshold or the steam parameter is less than a preset threshold, the second steam inlet shut-off valve and the second steam exhaust shut-off valve are controlled to be closed, and the first steam inlet shut-off valve and the first steam exhaust shut-off valve are controlled to be opened.

[0086] When the load rate of the thermal power unit is less than the preset threshold or the steam parameter is less than the preset threshold, it means that the steam pressure is low and the steam needs to be pressurized, so the second steam inlet shut-off valve 10222 and the second steam exhaust shut-off valve 10223 are controlled to be closed, and the first steam inlet shut-off valve 10212 and the first steam exhaust shut-off valve 10213 are controlled to be opened. The steam is passed into the first regulating unit 10211 to pressurize the steam input to the regulating unit 102.

[0087] In the efficient and stable industrial steam supply method suitable for wide load operation of thermal power units provided by the embodiment of the present invention, the steam inlet and exhaust shut-off valves are dynamically adjusted by monitoring the load rate and steam parameters of the thermal power units to select appropriate regulating units to reduce or increase the pressure of the steam. The industrial steam supply method of the embodiment of the present invention can flexibly adjust the steam pressure according to the actual operating conditions, optimize the steam utilization efficiency and the operating efficiency of the steam supply system, and output industrial steam that meets expectations. At the same time, it realizes the cascade utilization of energy, reduces energy waste, and improves the overall energy utilization efficiency.

[0088] Based on the above embodiments, Fig. 9 A flow chart of another efficient and stable industrial steam supply method suitable for wide load operation of thermal power units provided by an embodiment of the present invention is shown in FIG. Fig. 9 As shown in the figure, the efficient and stable industrial steam supply methods suitable for wide load operation of thermal power units include:

[0089] S301. Obtain the load rate of the thermal power unit and the steam parameters of the steam introduced into the steam inlet unit.

[0090] S302: When the load rate of the thermal power unit is greater than a preset threshold or the steam parameter is greater than a preset threshold, the first steam inlet shut-off valve and the first steam exhaust shut-off valve are controlled to be closed, and the second steam inlet shut-off valve and the second steam exhaust shut-off valve are controlled to be opened.

[0091] S303: When the load rate of the thermal power unit is less than a preset threshold or the steam parameter is less than a preset threshold, the second steam inlet shut-off valve and the second steam exhaust shut-off valve are controlled to be closed, and the first steam inlet shut-off valve and the first steam exhaust shut-off valve are controlled to be opened.

[0092] S304. Obtain steam supply parameters of the exhaust unit.

[0093] Among them, the steam supply parameter is the steam supply flow rate.

[0094] Specifically, Figures 1 to 9 As shown, the steam supply flow of the exhaust unit 103 is obtained. The steam supply flow is the steam flow after the steam is regulated by the regulating unit 102, reflecting the steam flow from the exhaust unit 103 to the industrial steam user. Exemplarily, the steam supply parameters of the exhaust unit are obtained through the steam supply parameter measuring meter 1031 and / or flow meter 1032 in the exhaust unit 103.

[0095] S305: When the steam supply parameter is greater than the steam supply parameter threshold, control is performed to reduce the steam inlet flow rate of the steam inlet unit.

[0096] Specifically, when the steam supply flow rate is greater than the threshold, it means that more steam is introduced into the industrial steam supply system at this time, and the amount of steam introduced into the steam inlet unit 101 is controlled to decrease. Exemplarily, the openings of the first steam system steam source regulating valve 10111 and the second steam system steam source regulating valve 10121 are controlled to decrease.

[0097] S306: When the steam supply parameter is less than the steam supply parameter threshold, control is performed to increase the steam inlet flow rate of the steam inlet unit.

[0098] Specifically, when the steam supply flow rate is less than the threshold value, it means that the steam introduced into the industrial steam supply system is less at this time, and the amount of steam introduced into the steam inlet unit 101 is controlled to increase. Exemplarily, the openings of the first steam system steam source regulating valve 10111 and the second steam system steam source regulating valve 10121 are controlled to increase.

[0099] Based on the above embodiments, Fig.10 A flow chart of another efficient and stable industrial steam supply method suitable for wide load operation of thermal power units provided by an embodiment of the present invention is shown in FIG. Fig.10 As shown in the figure, the efficient and stable industrial steam supply methods suitable for wide load operation of thermal power units include:

[0100] S401. Obtain the load rate of the thermal power unit and the steam parameters of the steam introduced into the steam inlet unit.

[0101] S402: When the load rate of the thermal power unit is equal to a preset threshold or the steam parameter is equal to a preset threshold, control the bypass steam supply unit to be turned on.

[0102] Among them, the first end of the bypass steam supply unit 104 is connected to the exhaust end of the steam inlet unit 101, and the second end of the bypass steam supply unit 104 is connected to the steam inlet end of the exhaust unit 103; the bypass steam supply unit 104 includes a bypass shut-off valve 1041; the first end of the bypass shut-off valve 1041 is connected to the first end of the bypass steam supply unit 104, and the second end of the bypass shut-off valve 1041 is connected to the second end of the bypass steam supply unit 104.

[0103] Specifically, Figures 1 to 10 As shown, when the load rate of the thermal power unit is equal to the preset threshold or the steam parameter is equal to the preset threshold, it means that the steam parameter introduced into the steam inlet unit 101 meets the expected steam parameter, and there is no need to adjust the steam. The bypass shut-off valve 1041 in the bypass steam supply unit 104 is turned on, and the bypass steam supply unit 104 directly passes the steam introduced into the steam inlet unit 101 to the exhaust unit 103 to be input to the industrial steam supply steam user.

[0104] S403: When the load rate of the thermal power unit is greater than a preset threshold or the steam parameter is greater than a preset threshold, the first steam inlet shut-off valve and the first steam exhaust shut-off valve are controlled to be closed, and the second steam inlet shut-off valve and the second steam exhaust shut-off valve are controlled to be opened.

[0105] S404. When the load rate of the thermal power unit is less than a preset threshold or the steam parameter is less than a preset threshold, the second steam inlet shut-off valve and the second steam exhaust shut-off valve are controlled to be closed, and the first steam inlet shut-off valve and the first steam exhaust shut-off valve are controlled to be opened.

[0106] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0107] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An efficient and stable industrial steam supply system suitable for wide load operation of thermal power units, characterized in that: include: Steam inlet unit, regulating unit and exhaust unit; The exhaust end of the steam inlet unit is connected to the steam inlet end of the regulating unit, and the exhaust end of the regulating unit is connected to the steam inlet end of the steam exhaust unit; The regulating unit comprises: a first regulating unit, a second regulating unit, a first steam inlet shut-off valve, a first steam exhaust shut-off valve, a second steam inlet shut-off valve and a second steam exhaust shut-off valve; The first end of the first steam inlet shut-off valve is connected to the first end of the second steam inlet shut-off valve and is connected to the steam inlet end of the regulating unit; The second end of the first steam inlet shut-off valve is connected to the steam inlet end of the first regulating unit, and the exhaust end of the first regulating unit is connected to the first end of the first steam exhaust shut-off valve; The second end of the second steam inlet shut-off valve is connected to the steam inlet end of the second regulating unit, and the exhaust end of the second regulating unit is connected to the first end of the second steam exhaust shut-off valve; The second end of the first exhaust shut-off valve is connected to the second end of the second exhaust shut-off valve and is connected to the exhaust end of the regulating unit; The first regulating unit is used to pressurize the steam input to the regulating unit; the second regulating unit is used to depressurize the steam input to the regulating unit and generate electricity using the steam.

2. The efficient and stable industrial steam supply system suitable for wide load operation of thermal power units according to claim 1 is characterized in that: The steam inlet unit comprises: a first steam system steam source regulating valve and a second steam system steam source regulating valve; The first end of the steam source regulating valve of the first steam system is connected to the first steam inlet end of the steam inlet unit and is connected to the exhaust end of the first steam system of the thermal power unit; The first end of the steam source regulating valve of the second steam system is connected to the second steam inlet end of the steam inlet unit and is connected to the exhaust end of the second steam system of the thermal power unit; The second end of the first steam system steam source regulating valve is connected to the second end of the second steam system steam source regulating valve and is connected to the exhaust end of the steam inlet unit.

3. The efficient and stable industrial steam supply system suitable for wide load operation of thermal power units according to claim 2 is characterized in that: The steam exhaust unit comprises: a steam supply parameter measuring meter and / or a flow meter; The sampling point of the steam supply parameter measuring meter is connected to the exhaust end of the regulating unit; and / or the first end of the flow meter is connected to the exhaust end of the regulating unit, and the second end of the flow meter is connected to the exhaust end of the exhaust unit; The data output end of the steam supply parameter measuring meter and / or the flow meter is connected to the data input end of the distributed control device; The distributed control device is used to control the opening of the first steam system steam source regulating valve and the second steam system steam source regulating valve according to the data collected by the steam supply parameter measuring meter and / or the flow meter; The steam exhaust unit further comprises: a steam supply safety valve; The first end of the steam supply safety valve is connected to the steam inlet end of the steam exhaust unit, and the second end of the steam supply safety valve is connected to the steam exhaust end of the steam exhaust unit.

4. The efficient and stable industrial steam supply system suitable for wide load operation of thermal power units according to claim 2 is characterized in that: The steam inlet unit further comprises: a shut-off valve for a steam source from a first steam system, a check valve for a steam source from a first steam system, a shut-off valve for a steam source from a second steam system, and a check valve for a steam source from a second steam system; The first end of the first steam system steam source shut-off valve is connected to the second end of the first steam system steam source regulating valve, the second end of the first steam system steam source shut-off valve is connected to the first end of the first steam system steam source check valve, and the second end of the first steam system steam source check valve is connected to the exhaust end of the steam inlet unit; The first end of the second steam system steam source shut-off valve is connected to the second end of the second steam system steam source regulating valve, the second end of the second steam system steam source shut-off valve is connected to the first end of the second steam system steam source check valve, and the second end of the second steam system steam source check valve is connected to the exhaust end of the steam inlet unit.

5. The efficient and stable industrial steam supply system suitable for wide load operation of thermal power units according to claim 1 is characterized in that: The regulating unit further comprises: a first exhaust steam check valve and a second exhaust steam check valve; The first end of the first exhaust check valve is connected to the exhaust end of the first regulating unit, and the second end of the first exhaust check valve is connected to the first end of the first exhaust shut-off valve; The first end of the second exhaust check valve is connected to the exhaust end of the second regulating unit, and the second end of the second exhaust check valve is connected to the first end of the second exhaust shut-off valve.

6. The efficient and stable industrial steam supply system suitable for wide load operation of thermal power units according to claim 1 is characterized in that: Also includes: Bypass steam supply unit; The first end of the bypass steam supply unit is connected to the exhaust end of the steam inlet unit, and the second end of the bypass steam supply unit is connected to the steam inlet end of the exhaust unit; The bypass steam supply unit includes a bypass shut-off valve; a first end of the bypass shut-off valve is connected to a first end of the bypass steam supply unit, and a second end of the bypass shut-off valve is connected to a second end of the bypass steam supply unit.

7. The efficient and stable industrial steam supply system suitable for wide load operation of thermal power units according to claim 1 is characterized in that: The first regulating unit and the second regulating unit are integrated turbines, and the turbines are used to pressurize and depressurize steam and generate electricity using steam; Alternatively, the first regulating unit is a steam booster, and the second regulating unit is a back pressure generator.

8. An efficient and stable industrial steam supply method suitable for wide load operation of thermal power units, applied to the efficient and stable industrial steam supply system suitable for wide load operation of thermal power units according to any one of claims 1 to 7, characterized in that: The method comprises: Obtaining the load rate of the thermal power unit and the steam parameters of the steam introduced into the steam inlet unit; the steam parameters include steam pressure; When the load rate of the thermal power unit is greater than a preset threshold or the steam parameter is greater than a preset threshold, the first steam inlet shut-off valve and the first steam exhaust shut-off valve are controlled to be closed, and the second steam inlet shut-off valve and the second steam exhaust shut-off valve are controlled to be opened; When the load rate of the thermal power unit is less than a preset threshold or the steam parameter is less than a preset threshold, the second steam inlet shut-off valve and the second steam exhaust shut-off valve are controlled to be closed, and the first steam inlet shut-off valve and the first steam exhaust shut-off valve are controlled to be opened.

9. The efficient and stable industrial steam supply method suitable for wide load operation of thermal power units according to claim 8, characterized in that: Also includes: The steam supply parameter of the exhaust unit is obtained. When the steam supply parameter is greater than a steam supply parameter threshold, the steam inlet flow rate of the steam inlet unit is controlled to be reduced. When the steam supply parameter is less than the steam supply parameter threshold, the steam inlet flow rate of the steam inlet unit is controlled to be increased. The steam supply parameter is the steam supply flow rate.

10. The efficient and stable industrial steam supply method suitable for wide load operation of thermal power units according to claim 8, characterized in that: After obtaining the load rate of the thermal power unit and the steam parameters of the steam introduced into the steam inlet unit, the method further includes: When the load rate of the thermal power unit is equal to a preset threshold or the steam parameter is equal to a preset threshold, controlling the bypass steam supply unit to be turned on; Wherein, the first end of the bypass steam supply unit is connected to the exhaust end of the steam inlet unit, and the second end of the bypass steam supply unit is connected to the steam inlet end of the exhaust unit; the bypass steam supply unit includes a bypass shut-off valve; the first end of the bypass shut-off valve is connected to the first end of the bypass steam supply unit, and the second end of the bypass shut-off valve is connected to the second end of the bypass steam supply unit.

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