Combined cycle power plant

Abstract

The application relates to a combined steam supply system. The system comprises a boiler, a steam turbine generator unit, and a steam supply water pump, a steam supply heater, a steam drum and a steam supply superheater connected in sequence; the steam supply superheater is arranged in the boiler, the steam supply heater is connected with the steam turbine generator unit; the steam supply water pump is used for obtaining steam supply water and adjusting the steam supply pressure of the steam supply water; the steam supply water pump is also used for transmitting the adjusted steam supply water to the steam supply heater; the steam supply heater is used for obtaining heat from a steam extraction process of the steam turbine generator unit, heating the adjusted steam supply water to obtain a steam-water mixture; the steam drum is used for flash evaporation and steam-water separation of the steam-water mixture to obtain saturated steam; and the steam supply superheater is used for heating the saturated steam based on heat obtained from the boiler to obtain steam for supply. The method can reduce resource waste.

Description

Technical Field

[0001] This application relates to the field of industrial technology, and in particular to a combined steam supply system. Background Technology

[0002] With the continuous development of technology in the industrial sector, higher demands are being placed on the comprehensive utilization and efficient supply of energy. Against this backdrop, combined steam supply technology has emerged. Combined steam supply technology aims to integrate multiple energy utilization methods to achieve a stable and efficient supply of steam to meet the needs of different industrial production and living scenarios. Its characteristic lies in its ability to flexibly allocate resources according to different heat sources and user needs, thereby improving the overall energy utilization efficiency.

[0003] In traditional steam supply methods, a single heat source is typically used to generate steam, such as directly supplying steam to users by burning fuel in a boiler. In traditional technologies, the steam generated by the boiler often lacks precise heat distribution and state optimization. It generally simply heats water into steam before delivery, making it difficult to accurately adjust parameters such as steam temperature and pressure to meet the needs of different users. Furthermore, in terms of heat energy utilization, the waste heat resources generated during the operation of steam turbine generator sets are not fully utilized, resulting in a certain degree of energy waste. Summary of the Invention

[0004] Therefore, it is necessary to provide a combined steam supply system that can reduce resource waste in response to the above-mentioned technical problems.

[0005] In a first aspect, this application provides a combined steam supply system, the system comprising a boiler, a steam turbine generator set, and a steam supply feedwater pump, a steam supply heater, a steam drum, and a steam supply superheater connected in sequence; the steam supply superheater is disposed in the boiler, and the steam supply heater is connected to the steam turbine generator set;

[0006] The steam and water supply pump is used to obtain steam and water supply, and to adjust the steam pressure of the steam and water supply; the steam and water supply pump is also used to transmit the adjusted steam and water supply to the steam heater;

[0007] The steam heater is used to obtain heat from the steam extraction process of the steam turbine generator set and heat the adjusted steam feedwater to obtain a steam-water mixture.

[0008] The steam drum is used to flash evaporate and separate the steam and water mixture to obtain saturated steam.

[0009] The steam superheater is used to heat the saturated steam based on the heat obtained from the boiler to obtain steam for supply.

[0010] In one embodiment, the steam drum is located outside the boiler.

[0011] In one embodiment, the steam superheater is specifically installed in the tail flue of the boiler, obtains heat from the flue gas transmitted in the tail flue, and uses the heat to heat the saturated steam to obtain steam for supply.

[0012] In one embodiment, the steam superheater specifically forms an independent flue in the tail flue of the boiler, and a flue gas baffle is provided outside the independent flue.

[0013] In one embodiment, the system further includes a control device connected to the steam and water supply pump.

[0014] The control device is used to obtain the steam supply pressure;

[0015] The steam supply and water supply pump is used to adjust the steam supply pressure of the steam supply and water supply according to the steam supply pressure.

[0016] In one embodiment, the control device is further configured to acquire the water supply flow rate;

[0017] The steam and water supply pump is also used to adjust the water supply flow rate of the steam and water supply according to the water supply flow rate.

[0018] In one embodiment, the control device is further configured to acquire the steam temperature.

[0019] The position of the flue gas baffle is adjusted based on the steam supply temperature so that the temperature of the heat carried by the flue gas matches the steam supply temperature.

[0020] In one embodiment, the system further includes a deaerator; the deaerator is connected to the steam superheater and the control device;

[0021] Upon receiving a command to terminate steam supply from the control device, the steam superheater delivers the steam to be supplied to the deaerator.

[0022] In one embodiment, the steam and water supply pump is a variable frequency control pump.

[0023] In one embodiment, the steam superheater is specifically used to use the heated steam as the steam to be supplied, provided that the heated steam meets the temperature control conditions.

[0024] The system also includes a temperature controller;

[0025] The temperature controller is installed after the steam superheater and is used to regulate the temperature of the heated steam when the heated steam does not meet the temperature control conditions, so as to obtain steam for supply.

[0026] The aforementioned combined steam supply system, by installing steam and feedwater pumps, can acquire steam and feedwater and flexibly adjust their supply pressure, laying the foundation for a stable and efficient steam supply process. This ensures that the water entering the system has suitable initial conditions, which is beneficial to improving the overall system's operational stability. The steam heater obtains heat from the extraction process of the turbine generator set to heat the steam and feedwater, fully utilizing the waste heat generated during the turbine generator set's operation, achieving cascaded energy utilization, effectively improving overall energy efficiency, and reducing energy waste. The steam drum performs flash evaporation and steam-water separation on the steam-water mixture to obtain saturated steam. This process, based on system pressure and other conditions, rapidly vaporizes the water in the steam-water mixture, producing saturated steam that meets certain quality requirements, providing a good intermediate product for further heating. The steam superheater heats the saturated steam based on the heat obtained from the boiler to obtain the steam for supply. It can precisely adjust steam parameters according to different users' requirements for steam temperature and pressure, ensuring that the supplied steam meets diverse industrial and domestic steam requirements, thereby reducing resource waste.

[0027] Attached reference numerals: Boiler-10; Steam turbine generator set-20; Steam and feedwater pump-30; Steam heater-40; Steam drum-50; Steam superheater-60; Deaerator-70; Temperature controller-80. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a structural block diagram of a combined steam supply system in one embodiment;

[0030] Figure 2 This is a structural block diagram of the combined steam supply system in another embodiment;

[0031] Figure 3 This is a structural block diagram of the combined steam supply system in another embodiment;

[0032] Figure 4 Here is a structural block diagram of the combined steam supply system in another embodiment;

[0033] Figure 5 Here is a structural block diagram of the combined steam supply system in one embodiment. Detailed Implementation

[0034] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0036] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. Furthermore, in the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if there is transmission of electrical signals or data between the connected objects.

[0037] When used herein, the singular forms of “a,” “an,” and “ / the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0038] As mentioned in the background technology section, with the continuous development of technology in the industrial sector, higher demands are being placed on the comprehensive utilization and efficient supply of energy. Against this backdrop, combined steam supply technology has emerged. Combined steam supply technology aims to integrate multiple energy utilization methods to achieve a stable and efficient supply of steam to meet the needs of different industrial production and living scenarios. Its key feature is its ability to flexibly allocate resources according to different heat sources and user needs, thereby improving the overall energy utilization efficiency.

[0039] In traditional steam supply methods, a single heat source is typically used to generate steam, such as directly supplying steam to users by burning fuel in a boiler. In traditional technologies, the steam generated by the boiler often lacks precise heat distribution and state optimization. It generally simply heats water into steam before delivery, making it difficult to accurately adjust parameters such as steam temperature and pressure to meet the needs of different users. Furthermore, in terms of heat energy utilization, the waste heat resources generated during the operation of steam turbine generator sets are not fully utilized, resulting in a certain degree of energy waste.

[0040] Based on this, such as Figure 1 As shown, a combined steam supply system is provided, comprising a boiler 10, a steam turbine generator set 20, and a steam feedwater pump 30, a steam heater 40, a steam drum 50, and a steam superheater 60 connected in sequence. The steam superheater 60 is disposed in the boiler 10, and the steam heater 40 is connected to the steam turbine generator set 20. The steam feedwater pump 30 is used to obtain steam feedwater and adjust the steam supply pressure of the steam feedwater. The steam feedwater pump is also used to transmit the adjusted steam feedwater to the steam heater 40. The steam heater 40 is used to obtain heat from the steam extraction process of the steam turbine generator set 20 to heat the adjusted steam feedwater to obtain a steam-water mixture. The steam drum 50 is used to flash the steam-water mixture to obtain saturated steam. The steam superheater 60 is used to heat the saturated steam based on the heat obtained from the boiler 10 to obtain steam for supply.

[0041] Boiler 10 is the core heat source equipment in the combined steam supply system. It generates high-temperature flue gas and heat by burning fuels (such as coal and natural gas), providing basic thermal energy for the entire system and serving as the source of steam generation. The turbine generator set 20 consists of a turbine and a generator. The turbine converts the thermal energy of steam into mechanical energy, driving the generator to rotate and converting the mechanical energy into electrical energy, thus achieving power generation. Simultaneously, it generates extracted steam with different parameters during operation, which can be used for steam supply heating and other processes. The steam supply feedwater pump 30 is used to obtain steam and feedwater and adjust their pressure. It introduces external water into the system and adjusts the feedwater pressure to a suitable range according to system requirements, ensuring that the feedwater can smoothly enter subsequent equipment for heating and treatment. The steam supply heater 40 is connected to the turbine generator set 20, obtaining heat from the steam extraction process of the turbine generator set 20. This heat is used to heat the adjusted steam and feedwater, raising the feedwater temperature and partially vaporizing it to form a steam-water mixture, achieving initial heat transfer and utilization. Steam drum 50 is a device used for flash evaporation and steam-water separation of a steam-water mixture. After the steam-water mixture enters steam drum 50, the water in it rapidly vaporizes due to pressure changes, thus separating saturated steam, which provides an intermediate product for further heating of the steam. The steam superheater 60 is installed in boiler 10. Its function is to heat the saturated steam based on the heat obtained from boiler 10, further increasing the steam temperature to meet the parameter requirements for the supplied steam and satisfying the steam quality needs of different users.

[0042] Specifically, in the combined steam supply system, the steam and feedwater pump 30 first obtains the steam and feedwater, and adjusts the steam pressure of the feedwater according to the system operation requirements. The pressurized feedwater is then transmitted to the steam heater 40. During normal operation, the turbine generator set 20 performs steam extraction, and the steam heater 40 extracts heat from this extracted steam to heat the feedwater. As heating progresses, the feedwater gradually partially vaporizes, forming a steam-water mixture. This mixture then enters the steam drum 50. Inside the steam drum 50, due to a sudden pressure drop, the water rapidly flashes and vaporizes, separating into saturated steam. Finally, the saturated steam enters the steam superheater 60 located in the boiler 10. The superheater 60 absorbs the heat generated by the boiler 10, further heating the saturated steam and raising its temperature, ultimately obtaining steam that meets the supply requirements, which is then delivered to various user terminals.

[0043] The aforementioned combined steam supply system, through the installation of a steam and feedwater pump 30, can acquire steam and feedwater and flexibly adjust its steam pressure, laying the foundation for a stable and efficient steam supply process. This ensures that the water entering the system has suitable initial conditions, which is beneficial to improving the overall system's operational stability. The steam heater 40 obtains heat from the extraction process of the steam turbine generator set 20 to heat the steam and feedwater, fully utilizing the waste heat generated during the operation of the steam turbine generator set 20, achieving cascaded energy utilization, effectively improving the comprehensive energy utilization efficiency, and reducing energy waste. The steam drum 50 flash-evaporates the steam-water mixture to obtain saturated steam. This process, based on system pressure and other conditions, rapidly vaporizes the water in the steam-water mixture, producing saturated steam that meets certain quality requirements, providing a good intermediate product for further heating. The steam superheater 60 heats the saturated steam based on the heat obtained from the boiler 10 to obtain steam for supply. It can precisely adjust steam parameters according to the different users' requirements for steam temperature and pressure, ensuring that the supplied steam meets diverse industrial and domestic steam requirements, thereby reducing resource waste.

[0044] In one embodiment, the steam drum 50 is located outside the boiler 10.

[0045] Specifically, during the operation of the combined steam supply system, the steam heater 40 heats the steam and feedwater into a steam-water mixture, which is then transported to the steam drum 50 located outside the boiler 10. The steam drum 50 has a specific internal structure design. When the steam-water mixture enters the steam drum 50, due to the relatively low pressure inside, the water in the mixture quickly undergoes flash evaporation, converting into steam. The incompletely vaporized water accumulates at the bottom of the steam drum 50 and can be returned to the system for reheating through the relevant pipes within the steam drum 50. After flash evaporation and steam-water separation in the steam drum 50, the resulting saturated steam has relatively stable quality and parameters, providing favorable conditions for further heating in the superheater 60.

[0046] In this embodiment, the steam drum 50 is located outside the boiler 10, which facilitates its installation, maintenance, and repair, reducing operational difficulty and safety risks. Simultaneously, the independent steam drum 50 enables better steam-water separation and flash evaporation, improving steam quality and ensuring stable system operation.

[0047] In one embodiment, the steam superheater 60 is specifically installed in the tail flue of the boiler 10, which obtains heat from the flue gas transmitted in the tail flue and heats the saturated steam to obtain steam for supply.

[0048] The tail flue is a passageway for the exhaust of flue gas in boiler 10. After passing through the heating surfaces inside boiler 10, the temperature of the flue gas decreases, but it still carries a certain amount of heat. The tail flue provides a place for heat exchange for the steam superheater 60, enabling the heat in the flue gas to be effectively utilized.

[0049] Specifically, during the operation of the combined steam supply system, the saturated steam separated from the steam drum 50 enters the steam superheater 60 located in the tail flue of the boiler 10. At this time, the high-temperature flue gas generated by the combustion of fuel in the boiler 10 completes preliminary heat transfer within the boiler 10 before entering the tail flue. The steam superheater 60 engages in thorough heat exchange with the flue gas in the tail flue. The heat in the flue gas is transferred to the saturated steam within the steam superheater 60, causing the temperature of the saturated steam to gradually increase. With the flow and heat absorption of the steam within the steam superheater 60, the required temperature and quality of the steam for supply are eventually achieved, and then the steam is delivered to the user end to meet the steam demands of different users.

[0050] In this embodiment, the steam superheater 60 is installed in the tail flue of the boiler 10, which makes full use of the waste heat in the flue gas, improves the overall energy utilization efficiency, and reduces energy consumption. At the same time, this arrangement reduces the need for additional heat acquisition equipment, simplifies the system structure, and reduces construction costs.

[0051] In one embodiment, the steam superheater 60 is specifically formed as an independent flue in the tail flue of the boiler 10, and a flue gas baffle is provided outside the independent flue.

[0052] The independent flue is a separate section within the tail flue of the boiler 10 for the steam superheater 60, independent of the main flue. It provides a relatively closed and controllable environment for heat exchange between the steam superheater 60 and the flue gas, which is beneficial for optimizing heat transfer. The flue gas damper, located outside the independent flue, is a device used to regulate flue gas flow and heat transfer. By changing the position of the damper, the amount of flue gas entering the independent flue can be controlled, thereby adjusting the heat carried by the flue gas to match the heating requirements of the steam in the steam superheater 60.

[0053] Specifically, in the combined steam supply system, the steam superheater 60 forms an independent flue in the tail flue of the boiler 10. When the system is running, the flue gas generated by the boiler 10 flows in the tail flue. By adjusting the position of the flue gas damper outside the independent flue, the flow rate of the flue gas entering the independent flue can be controlled. If it is necessary to increase the heating amount of the steam in the steam superheater 60, the flue gas damper is opened at a certain angle, allowing more high-temperature flue gas to enter the independent flue and exchange heat with the steam superheater 60, thus increasing the steam temperature. Conversely, if it is necessary to reduce the heating amount, the opening angle of the flue gas damper is reduced, decreasing the amount of flue gas entering the independent flue. In this way, the heat carried by the flue gas can be precisely adjusted according to the actual steam supply demand, ensuring that the steam temperature output by the steam superheater 60 remains stable within a suitable range.

[0054] In this embodiment, the steam superheater 60 forms an independent flue and is equipped with a flue gas damper, which enables precise regulation of flue gas heat, making the steam heating process more flexible and controllable. The position of the flue gas damper can be adjusted in a timely manner according to different steam temperature requirements, ensuring the stability of steam quality and improving the system's adaptability and operating efficiency.

[0055] In one embodiment, the system further includes a control device; the control device is connected to the steam supply and water supply pump 30; the control device is used to acquire the steam supply pressure; the steam supply and water supply pump 30 is used to adjust the steam supply pressure of the steam supply and water supply according to the steam supply pressure.

[0056] Among them, the control equipment is the equipment used to monitor and control the entire system in the combined steam supply system. It can acquire various parameter information in the system and issue control commands based on this information to adjust the operating status of each piece of equipment.

[0057] Specifically, the control equipment plays a core regulatory role in the combined steam supply system. It acquires important parameters such as steam supply pressure, feedwater flow rate, and steam temperature in real time through sensors distributed throughout the system's key components. For example, when a sensor detects a change in steam supply pressure, it transmits the pressure data to the control equipment, which then makes a judgment based on a pre-set steam supply pressure range. If the steam supply pressure deviates from the normal range, the control equipment immediately sends a control command to the steam supply and feedwater pump 30 to adjust the steam supply and feedwater pressure, restoring it to the normal level.

[0058] In one embodiment, the control device is further configured to acquire the feedwater flow rate; the steam supply water pump 30 is further configured to adjust the feedwater flow rate of the steam supply water according to the feedwater flow rate.

[0059] For example, when an abnormal flow rate is detected, the control equipment will instruct the steam supply feedwater pump 30 to adjust the feedwater flow rate. Furthermore, the control equipment can be connected to other equipment such as the steam supply superheater 60, the deaerator 70 in the power generation steam-water equipment, and the condenser, to coordinate the work between various devices according to the overall system operation, ensuring the safe, stable, and efficient operation of the entire combined steam supply system.

[0060] In the above embodiments, the presence of control equipment enables automated monitoring and control of the combined steam supply system, which can promptly detect and handle problems in system operation, improve system operating efficiency and reliability, and reduce errors and labor intensity caused by manual operation.

[0061] In one embodiment, the control device is further configured to acquire the steam supply temperature and adjust the position of the flue gas damper based on the steam supply temperature so that the temperature of the heat carried by the flue gas matches the steam supply temperature.

[0062] Steam supply temperature refers to the temperature of the steam supplied by the combined steam supply system, and it is one of the important indicators for measuring steam quality. Different users have different requirements for steam supply temperature, and the control equipment needs to precisely adjust the steam temperature according to these requirements.

[0063] Specifically, in a combined steam supply system, the control equipment plays a crucial role in monitoring and regulation. It acquires the steam temperature parameters output by the system in real time and compares these parameters with the preset steam temperature requirements. If the detected steam temperature is higher or lower than the preset value, the control equipment automatically adjusts the position of the flue gas damper based on the deviation. When the steam temperature is too high, the control equipment issues a command to move the flue gas damper towards the closed direction by a certain angle, reducing the amount of flue gas entering the independent flue and decreasing the heat carried by the flue gas, thereby reducing the amount of heat applied to the steam in the superheater 60 and lowering the steam temperature. Conversely, when the steam temperature is too low, the control equipment moves the flue gas damper towards the open direction, increasing the amount of flue gas entering the independent flue and raising the steam temperature. Through this precise regulation, the steam temperature is ensured to remain stable within a suitable range.

[0064] In this embodiment, the control equipment achieves automatic and precise control of the steam temperature by acquiring the steam supply temperature and adjusting the position of the flue gas damper. This allows for timely response to changes in the steam supply temperature, ensuring that the steam quality meets the needs of different users, improving the system's intelligence and operational stability, and reducing the possibility of manual intervention and operational errors.

[0065] In one embodiment, such as Figure 2As shown, the system also includes a deaerator 70; the deaerator 70 is connected to the steam supply superheater 60 and the control equipment; upon receiving a termination steam supply command from the control equipment, the steam supply superheater 60 delivers the steam to be supplied to the deaerator 70.

[0066] The deaerator 70 is a device used to remove dissolved oxygen from the feedwater. Dissolved oxygen can corrode equipment such as boiler 10, affecting the service life and safety of the equipment, so it needs to be treated by the deaerator 70.

[0067] Specifically, during system operation, when a steam supply termination command is received from the control equipment, the superheater 60 transfers the steam originally intended for supply to the deaerator 70. The deaerator 70 has a specific internal structure and operating principle, generally employing thermal or chemical deaeration methods. Taking thermal deaeration as an example, the steam entering the deaerator 70 comes into full contact with the feedwater, transferring its heat to the feedwater and raising its temperature. As the water temperature rises, the partial pressure of steam above the water surface gradually increases, while the partial pressure of dissolved oxygen gradually decreases. When the water temperature approaches saturation, the surface is almost entirely covered by steam, and the partial pressure of dissolved oxygen approaches zero. At this point, the dissolved oxygen in the water escapes and is discharged through the exhaust port of the deaerator 70. In this way, the deaerator 70 effectively removes dissolved oxygen from the feedwater, protecting equipment such as the boiler 10 from corrosion, extending the service life of the equipment, and ensuring the safe and stable operation of the system.

[0068] In this embodiment, the deaerator 70 can remove dissolved oxygen from the feedwater, prevent equipment such as boiler 10 from being damaged by oxygen corrosion, improve the safety and service life of the equipment, and ensure the long-term stable operation of the system.

[0069] In one embodiment, the steam and water supply pump 30 is a variable frequency control pump.

[0070] Among them, a variable frequency drive (VFD) pump is a type of pump that adjusts the motor speed by changing the power supply frequency, thereby changing the pump's flow rate and head. The use of VFD control technology in the steam supply feedwater pump 30 allows for flexible adjustment of the pump's operating parameters according to the actual needs of the steam supply system.

[0071] Specifically, the steam supply and feedwater pump 30 employs variable frequency drive (VFD) pump technology. During system operation, sensors installed in the steam supply system monitor parameters such as steam supply pressure and feedwater flow rate in real time. After acquiring the data monitored by these sensors, the data can be analyzed and judged. If the current steam supply pressure is lower than the set value, a command can be issued to increase the motor power supply frequency, thereby increasing the motor speed and the outlet pressure of the steam supply and feedwater pump 30, thus increasing the steam supply pressure. Conversely, if the steam supply pressure is too high, the motor power supply frequency can be reduced, slowing down the motor speed and lowering the outlet pressure of the steam supply and feedwater pump 30. Similarly, for the feedwater flow rate, when insufficient feedwater flow is detected, the pump flow rate can be increased by adjusting the motor speed; when the feedwater flow rate is too high, the motor speed can be reduced to decrease the pump flow rate. Through this VFD control method, the steam supply and feedwater pump 30 can accurately adjust the steam supply pressure and feedwater flow rate according to actual needs, ensuring the stable operation of the steam supply system.

[0072] In this embodiment, a variable frequency control pump is used as the steam and water supply pump 30, which can flexibly adjust the operating parameters according to the actual needs of the system, avoid the energy waste of traditional pumps running at constant speed, improve energy utilization efficiency, and at the same time ensure the stability of steam supply pressure and water supply flow.

[0073] In one embodiment, such as Figure 3 As shown, the steam supply superheater 60 is specifically used to use the heated steam as the steam for supply when the heated steam meets the temperature control conditions; the system also includes a temperature regulator 80; the temperature regulator 80 is located after the steam supply superheater 60 and is used to adjust the temperature of the heated steam when the heated steam does not meet the temperature control conditions, so as to obtain the steam for supply.

[0074] Temperature control conditions refer to a pre-set specific temperature range or value used to determine whether the steam temperature meets the supply requirements. When the steam temperature is within this range or reaches this value, the temperature control conditions are considered met. The temperature controller 80 is installed after the steam superheater 60 and is used to regulate the temperature of the steam when the steam heated by the steam superheater 60 does not meet the temperature control conditions, ensuring that the final supplied steam temperature meets the requirements. For example, the temperature controller 80 can be a heater or a desuperheater, depending on the actual situation.

[0075] Specifically, during system operation, the superheater 60 heats saturated steam to obtain steam. At this point, it first checks whether the temperature of the heated steam meets the preset temperature control conditions. If the temperature control conditions are met, the steam can be directly used as the supply steam output. However, when the temperature of the heated steam is detected to be below the temperature control conditions, the thermostat 80 begins to function. The thermostat 80 has a corresponding temperature regulation mechanism inside, which can regulate the temperature of the steam that does not meet the temperature requirements, for example, by adjusting the flow rate of the cooling medium or changing the heat exchange area. After precise adjustment by the thermostat 80, the steam temperature reaches the standard for supply, ultimately obtaining the steam used for supply, ensuring a stable and reliable steam quality output from the entire steam supply system.

[0076] In this embodiment, the thermostat 80 increases the system's ability to control the steam temperature, allowing for flexible adjustment of the steam temperature according to actual conditions, ensuring that the supplied steam always meets the usage requirements, and improving the system's stability and reliability.

[0077] This embodiment develops a heat and power decoupling technology for industrial steam supply cogeneration units. Industrial steam supply is no longer a factor limiting deep regulation capacity and top load capacity, enabling the flexibility of pure condensing units. Furthermore, industrial steam supply achieves "energy level matching and graded matching" cogeneration, significantly improving the economic efficiency of industrial steam supply.

[0078] In a specific embodiment, such as Figure 4 and Figure 5 As shown, a combined steam supply system is also provided, in which the power generation steam-water system and the steam supply steam-water system are completely separated, and the generator set operates in pure condensing mode, which is equivalent to one flue gas system driving two steam-water systems. Among them, Figure 4 It is a three-flue system. Figure 5 This is a dual-flue system. Based on the varying industrial steam supply pressure requirements, an industrial steam supply feedwater pump raises the feedwater pressure to the necessary level for industrial steam supply. The feedwater then enters the steam supply heater for heating. The steam supply heater utilizes steam extracted from the turbine to generate a steam-water mixture, which then enters the steam drum. The steam drum is the steam-generating device, operating on the principle of flash evaporation. The saturated steam generated by flash evaporation enters the industrial steam supply superheater for superheating. The tail flue industrial steam supply superheater can be integrated into the original boiler heating surface or form an independent flue arrangement. Finally, the industrial steam supply from the superheater is adjusted to the required parameters by a desuperheater and pressure reducer before being supplied to the outside.

[0079] The operation method of this embodiment is as follows: When industrial steam is supplied, the pressure is adjusted by the steam supply feedwater pump to reach the pressure required for industrial steam supply; the steam extraction rate of the steam supply heater is adjusted to regulate the feedwater temperature at the outlet of the steam supply heater (as close to the saturation temperature as possible); then the generated steam-water mixture enters the steam drum to generate saturated steam, and the saturated steam enters the industrial steam supply superheater to generate superheated steam. If necessary, a desuperheater can be installed after the superheated steam to adjust the temperature of the supplied steam. When industrial steam supply is interrupted, in order to ensure that the temperature of the industrial steam supply superheater does not exceed the allowable limit for metals, the industrial steam supply system operates at the minimum flow rate, and the generated steam enters the deaerator or desuperheats and depressurizes before entering the condenser.

[0080] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0081] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A combined steam supply system, characterized in that, The system includes a boiler, a steam turbine generator set, and a steam supply feedwater pump, a steam supply heater, a steam drum, and a steam supply superheater connected in sequence; the steam supply superheater is installed in the boiler, and the steam supply heater is connected to the steam turbine generator set. The steam and water supply pump is used to obtain steam and water supply, and to adjust the steam pressure of the steam and water supply; the steam and water supply pump is also used to transmit the adjusted steam and water supply to the steam heater; The steam heater is used to obtain heat from the steam extraction process of the steam turbine generator set and heat the adjusted steam feedwater to obtain a steam-water mixture. The steam drum is used to flash evaporate and separate the steam and water mixture to obtain saturated steam. The steam superheater is used to heat the saturated steam based on the heat obtained from the boiler to obtain steam for supply.

2. The system according to claim 1, characterized in that, The steam drum is located outside the boiler.

3. The system according to claim 1, characterized in that, The steam superheater is specifically installed in the tail flue of the boiler. It obtains heat from the flue gas transmitted in the tail flue and uses the heat to heat the saturated steam to obtain steam for supply.

4. The system according to claim 3, characterized in that, The steam superheater specifically forms an independent flue in the tail flue of the boiler, and a flue gas baffle is provided outside the independent flue.

5. The system according to claim 4, characterized in that, The system also includes a control device; the control device is connected to the steam and water supply pump. The control device is used to obtain the steam supply pressure; The steam supply and water supply pump is used to adjust the steam supply pressure of the steam supply and water supply according to the steam supply pressure.

6. The system according to claim 5, characterized in that, The control device is also used to acquire the water supply flow rate; The steam and water supply pump is also used to adjust the water supply flow rate of the steam and water supply according to the water supply flow rate.

7. The system according to claim 5, characterized in that, The control device is also used to obtain the steam temperature; The position of the flue gas baffle is adjusted based on the steam supply temperature so that the temperature of the heat carried by the flue gas matches the steam supply temperature.

8. The system according to claim 5, characterized in that, The system also includes a deaerator; the deaerator is connected to the steam superheater and the control equipment. Upon receiving a command to terminate steam supply from the control device, the steam superheater delivers the steam to be supplied to the deaerator.

9. The system according to claim 1, characterized in that, The steam and water supply pump is a variable frequency control pump.

10. The system according to claim 1, characterized in that, The steam superheater is specifically used to supply steam as heated steam when the heated steam meets the temperature control conditions. The system also includes a temperature controller; The temperature controller is installed after the steam superheater and is used to regulate the temperature of the heated steam when the heated steam does not meet the temperature control conditions, so as to obtain steam for supply.

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