Wide-load heat supply system and method and multi-unit wide-load heat supply system
By designing a wide load heating system, the steam parameters of the generator set are extracted and adjusted separately, the problem of difficult to ensure steam supply parameters under low load conditions is solved, the stability and safety of steam supply are achieved, and multiple steam sources are avoided Frequent switching of points improves the quality and adaptability of industrial steam supply.
Patent Information
- Application Number
- CN202411695779.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-01-10
AI Technical Summary
In the prior art, in the low-load conditions, the steam supply parameters of the generator set are difficult to ensure, resulting in poor steam supply stability and safety, and frequent switching of multiple steam source points, affecting the quality and stability of industrial steam supply.
Design a wide load heating system to obtain high-grade, medium-grade and low-grade steam by extracting steam from multiple steam source points of the generator set, and use high-pressure, medium-pressure, and low-pressure cylinders and corresponding temperature reduction reduction The pressure device adjusts the steam parameters and provides steam that meets user needs, avoiding frequent switching and operation.
It ensures the stability and safety of steam supply parameters under low load conditions, avoids frequent switching of multiple steam source points, and improves the stability and adaptability of industrial steam supply.
Smart Images
Figure CN119289413A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of heating of generator sets, and in particular to a wide-load heating system, a wide-load heating method and a multi-unit wide-load heating system. Background Art
[0002] With the diversification of power plant operations, in addition to residential heating, a considerable number of power plants also provide industrial steam supply with various parameters to surrounding enterprises. Industrial parks have many heat users, large heat loads, and diverse steam parameters. In recent years, due to the rapid construction of power sources, the installed capacity of new energy power such as wind power, photovoltaics, and hydropower has continued to grow rapidly, and the national power supply and demand situation has undergone a fundamental change. The annual operating hours of some cogeneration power plants have continued to decline, and the quality and stability of industrial steam extraction have been seriously affected.
[0003] In order to meet the peak load demand of the power grid, the generator sets are often operated at a lower load. However, the steam demand parameters of external users are variable. In order to ensure the steam supply demand, multiple steam sources have to be switched, resulting in poor steam supply stability.
[0004] The prior art uses relatively high extraction parameters during design to reduce the temperature and pressure before supplying the steam to the outside. However, under low load conditions, the temperature reduction and pressure reduction device has poor cooling effect, making it difficult to ensure the steam supply parameters, resulting in poor steam supply safety. Summary of the invention
[0005] In order to solve one of the above-mentioned technical defects, the present invention provides a wide-load heating system and method, and a multi-unit wide-load heating system. The wide-load heating system extracts steam from multiple steam source points of the generator set to obtain high-grade steam, medium-grade steam and low-grade steam with different steam parameters. Users can select steam parameters according to their needs, which can not only realize wide-load steam supply for users and avoid frequent switching operation of multiple steam source points, but also solve the problem that the steam supply parameters of the unit cannot be guaranteed under low-load conditions.
[0006] A first aspect of the present invention provides a wide load heating system, comprising: a first steam extraction device, a second steam extraction device, a third steam extraction device, a high-pressure steam sub-cylinder, a medium-pressure steam sub-cylinder and a low-pressure steam sub-cylinder; The input end of the first steam extraction device is used to extract high-grade steam from the generator set, and the output end of the first steam extraction device is connected to the high-pressure sub-cylinder to deliver the extracted high-grade steam to the high-pressure sub-cylinder; The input end of the second steam extraction device is used to extract medium-grade steam from the generator set, and the output end of the second steam extraction device is connected to the medium-pressure sub-cylinder to deliver the extracted medium-grade steam to the medium-pressure sub-cylinder; The input end of the third steam extraction device is used to extract low-grade steam from the generator set, and the output end of the third steam extraction device is connected to the low-pressure sub-cylinder to deliver the extracted low-grade steam to the low-pressure sub-cylinder; The high-pressure sub-cylinder, the medium-pressure sub-cylinder and the low-pressure sub-cylinder are respectively connected to the steam supply mother pipe, and provide high-grade steam, medium-grade steam and low-grade steam to the steam supply mother pipe respectively.
[0007] In an embodiment of the present invention, the high-pressure sub-cylinder and the medium-pressure sub-cylinder are connected via a first connecting pipe, on which a first temperature reduction and pressure reduction device is provided, for converting high-quality steam into medium-quality steam.
[0008] In an embodiment of the present invention, the medium-pressure sub-cylinder is connected to the low-pressure sub-cylinder via a second connecting pipe, and a second temperature and pressure reduction device is provided on the second connecting pipe. The second temperature and pressure reduction device is used to convert medium-grade steam into low-grade steam.
[0009] In an embodiment of the present invention, the first steam extraction device comprises: a gate valve, a second electric regulating valve, a pressure reducing valve, a check valve, a second flow meter and a third electric regulating valve connected in sequence; The first steam extraction device adjusts the flow rate of high-grade steam by adjusting the opening of the first electric regulating valve and the second electric regulating valve.
[0010] In an embodiment of the present invention, the second steam extraction device includes: a fourth electric regulating valve, a first electric check valve, a first hydraulic fast closing valve, a fifth electric regulating valve and a second temperature and pressure reducing device which are connected in sequence.
[0011] In an embodiment of the present invention, the third steam extraction device includes: a second electric check valve and a second hydraulic quick-closing valve connected in sequence.
[0012] In an embodiment of the present invention, the first flow meter is a flow measurement plate.
[0013] The second aspect of the present invention provides a multi-unit wide-load heating system, comprising a plurality of generator sets, each generator set is provided with a first steam extraction device, a second steam extraction device and a third steam extraction device, the output end of the first steam extraction device of each generator set is connected to the high-pressure sub-cylinder, the output end of the second steam extraction device of each generator set is connected to the medium-pressure sub-cylinder, and the output end of the third steam extraction device of each generator set is connected to the low-pressure sub-cylinder; The input end of the first steam extraction device is used to extract high-grade steam from the generator set, and the output end of the first steam extraction device is connected to the high-pressure sub-cylinder to deliver the extracted high-grade steam to the high-pressure sub-cylinder; The input end of the second steam extraction device is used to extract medium-grade steam from the generator set, and the output end of the second steam extraction device is connected to the medium-pressure sub-cylinder to deliver the extracted medium-grade steam to the medium-pressure sub-cylinder; The input end of the third steam extraction device is used to extract low-grade steam from the generator set, and the output end of the third steam extraction device is connected to the low-pressure sub-cylinder to deliver the extracted low-grade steam to the low-pressure sub-cylinder; The high-pressure sub-cylinder, the medium-pressure sub-cylinder and the low-pressure sub-cylinder are respectively connected to the steam supply mother pipe, and provide high-grade steam, medium-grade steam and low-grade steam to the steam supply mother pipe respectively.
[0014] In an embodiment of the present invention, the power generation capacities of the multiple generator sets are equal.
[0015] A third aspect of the present invention provides a wide load heating method, comprising: The high-quality steam of the generator set is extracted to the high-pressure steam sub-cylinder through the first steam extraction device, and the high-quality steam is provided to the user through the high-pressure steam sub-cylinder; The medium-grade steam of the generator set is extracted to the medium-pressure steam sub-cylinder through the second steam extraction device, and the medium-grade steam is provided to the user through the medium-pressure steam sub-cylinder; The medium and low-level steam of the generator set is extracted to the low-pressure sub-cylinder through the third steam extraction device, and low-grade steam is provided to users through the low-pressure sub-cylinder. The wide-load heating system extracts steam from multiple steam source points of the generator set to obtain high-grade steam, medium-grade steam and low-grade steam with different steam parameters. Users can select steam parameters according to their needs, which can not only realize wide-load steam supply for users and avoid frequent switching operation of multiple steam source points, but also solve the problem that the steam supply parameters cannot be guaranteed when the unit is under low-load conditions.
[0016] Other features and advantages of the technical solution of the present invention will be described in detail in the specific implementation section below. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 is a structural schematic diagram of a wide-load heating system provided by Example 1 of the present invention; Figure 2 is a flow chart of a wide load heating method provided in Example 1 of the present invention; Figure 3 It is a structural schematic diagram of a multi-unit wide-load heating system provided in Example 2 of the present invention.
[0018] Description of Reference Numerals 01-the first steam extraction device, 02-the second steam extraction device, 03-the third steam extraction device, 04-the high-pressure sub-cylinder, 05-the medium-pressure sub-cylinder, 06-the low-pressure sub-cylinder, 07-the first temperature reduction and pressure reduction device, 08-the second temperature reduction and pressure reduction device, 09-the high-pressure cylinder, 10-the medium-pressure cylinder. DETAILED DESCRIPTION
[0019] In order to make the technical solutions and advantages of the embodiments of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all the embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.
[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.
[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0022] In the present invention, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0023] In the process of realizing the present invention, the inventors found that with the diversification of power plant operations, in addition to residential heating, a considerable number of power plants also provide industrial steam supply with various parameters to surrounding enterprises. Industrial parks have many heat users, large heat loads, and diverse steam parameters. In recent years, due to the rapid construction of power sources, the installed capacity of new energy power such as wind power, photovoltaics, and hydropower has continued to grow rapidly, and the national power supply and demand situation has undergone a fundamental change. The annual operating hours of some cogeneration power plants have continued to decline, and the quality and stability of industrial steam extraction have been seriously affected.
[0024] In order to meet the peak load demand of the power grid, the generator sets are often operated at a lower load. However, the steam demand parameters of external users are variable. In order to ensure the steam supply demand, multiple steam sources have to be switched, resulting in poor steam supply stability.
[0025] The prior art uses relatively high extraction parameters during design to reduce the temperature and pressure before supplying the steam to the outside. However, under low load conditions, the temperature reduction and pressure reduction device has poor cooling effect, making it difficult to ensure the steam supply parameters, resulting in poor steam supply safety.
[0026] In view of the above problems, a wide-load heating system is provided in an embodiment of the present invention, including: a first steam extraction device, a second steam extraction device, a third steam extraction device, a high-pressure sub-cylinder, a medium-pressure sub-cylinder and a low-pressure sub-cylinder; the input end of the first steam extraction device is used to extract high-grade steam from the generator set, and the output end of the first steam extraction device is connected to the high-pressure sub-cylinder to transport the extracted high-grade steam to the high-pressure sub-cylinder; the input end of the second steam extraction device is used to extract medium-grade steam from the generator set, and the output end of the second steam extraction device is connected to the medium-pressure sub-cylinder to transport the extracted medium-grade steam to the medium-pressure sub-cylinder; the input end of the third steam extraction device is used to extract low-grade steam from the generator set, and the output end of the third steam extraction device is connected to the low-pressure sub-cylinder to transport the extracted low-grade steam to the low-pressure sub-cylinder; the high-pressure sub-cylinder is used to provide high-grade steam to users, the medium-pressure sub-cylinder is used to provide medium-grade steam to users, and the low-pressure sub-cylinder is used to provide low-grade steam to users. The wide-load heating system extracts steam from multiple steam source points of the generator set to obtain high-grade steam, medium-grade steam and low-grade steam with different steam parameters. Users can select steam parameters according to their needs, which can not only realize wide-load steam supply for users and avoid frequent switching operation of multiple steam source points, but also solve the problem that the steam supply parameters cannot be guaranteed when the unit is under low-load conditions.
[0027] Example 1 Figure 1 Schematic diagram of a wide load heating system provided by Example 1 of the present invention. Figure 1As shown, a wide load heating system provided in this embodiment includes: a first steam extraction device 01, a second steam extraction device 02, a third steam extraction device 03, a high-pressure sub-cylinder 04, a medium-pressure sub-cylinder 05 and a low-pressure sub-cylinder 06; The input end of the first steam extraction device 01 is used to extract high-quality steam from the generator set, and the output end of the first steam extraction device 01 is connected to the high-pressure sub-cylinder 04 to deliver the extracted high-quality steam to the high-pressure sub-cylinder 04; The input end of the second steam extraction device 02 is used to extract the medium-grade steam of the generator set, and the output end of the second steam extraction device 02 is connected to the medium-pressure sub-cylinder 05 to deliver the extracted medium-grade steam to the medium-pressure sub-cylinder 05; The input end of the third steam extraction device 03 is used to extract low-grade steam from the generator set, and the output end of the third steam extraction device 03 is connected to the low-pressure sub-cylinder 06 to deliver the extracted low-grade steam to the low-pressure sub-cylinder 06; The high-pressure sub-cylinder 04, the medium-pressure sub-cylinder 05 and the low-pressure sub-cylinder 06 are respectively connected to the steam supply main pipe, and provide high-grade steam, medium-grade steam and low-grade steam to the steam supply main pipe respectively. The high-pressure sub-cylinder 04 is used to provide high-quality steam to users, the medium-pressure sub-cylinder 05 is used to provide medium-quality steam to users, and the low-pressure sub-cylinder 06 is used to provide low-quality steam to users.
[0028] In this embodiment, by extracting steam from multiple steam source points of the generator set, high-grade steam, medium-grade steam and low-grade steam with different steam parameters are obtained respectively. The user selects steam parameters according to demand, which can not only realize steam supply for users with a wide load and avoid frequent switching operation of multiple steam source points, but also solve the problem that the steam supply parameters cannot be guaranteed when the unit is under low load conditions.
[0029] In this embodiment, the input end of the first steam extraction pipeline is connected to the output end of the high-pressure cylinder 09 of the generator set, and is used to receive a section of extraction steam from the high-pressure cylinder 09; the input end of the second steam extraction pipeline is connected to the input end of the intermediate-pressure cylinder 10, and is used to receive the reheat section extraction steam of the generator set; the input end of the third steam extraction pipeline is connected to the output end of the intermediate-pressure cylinder 10, and is used to receive the middle exhaust extraction steam from the intermediate-pressure cylinder 10.
[0030] The high-pressure sub-cylinder 04 is connected to the medium-pressure sub-cylinder 05 via a first connecting pipe, on which a first temperature reduction and pressure reduction device 07 is provided. The first temperature reduction and pressure reduction device 07 is used to convert high-quality steam into medium-quality steam.
[0031] In this embodiment, a first temperature reduction and pressure reduction device 07 is provided between the high-pressure sub-cylinder 04 and the medium-pressure sub-cylinder 05 , and the first temperature reduction and pressure reduction device 07 includes: a first temperature reduction and pressure reduction device, a first electric regulating valve and a first flow meter.
[0032] In this embodiment, the high-pressure sub-cylinder 04 and the medium-pressure sub-cylinder 05 are connected through the first temperature reduction and pressure reduction device 07. When the medium-grade steam in the medium-pressure sub-cylinder 05 does not meet the user's required amount, the high-grade steam in the high-pressure sub-cylinder 04 is converted into medium-grade steam under the action of the first temperature reduction and pressure reduction device 07 and then flows to the medium-pressure sub-cylinder 05, so as to solve the problem that the medium-grade steam in the medium-pressure sub-cylinder 05 does not meet the user's required amount.
[0033] In this embodiment, the first flow meter is used to monitor the flow of steam flowing from the high-pressure sub-cylinder 04 to the medium-pressure sub-cylinder 05, the first electric regulating valve is used to control the flow of steam flowing from the high-pressure sub-cylinder 04 to the medium-pressure sub-cylinder 05, and the first temperature and pressure reducing device is used to reduce the temperature and pressure of the steam parameters of the steam flowing from the high-pressure sub-cylinder 04 to the medium-pressure sub-cylinder 05. Further, the steam parameters include: the temperature of the steam and the pressure of the steam.
[0034] In this embodiment, the medium-pressure sub-cylinder 05 is connected to the low-pressure sub-cylinder 06 via a second connecting pipe, and a second temperature reduction and pressure reduction device 08 is provided on the second connecting pipe. The second temperature reduction and pressure reduction device 08 is used to convert medium-grade steam into low-grade steam.
[0035] In this embodiment, a second temperature reduction and pressure reduction device 08 is provided between the medium-pressure sub-cylinder 05 and the low-pressure sub-cylinder 06 , and the second temperature reduction and pressure reduction device 08 has the same structure as the first temperature reduction and pressure reduction device 07 .
[0036] Similarly, the medium-pressure sub-cylinder 05 and the low-pressure sub-cylinder 06 are connected through the second temperature reduction and pressure reduction device 08. When the low-grade steam in the low-pressure sub-cylinder 06 does not meet the user's required amount, the medium-grade steam in the medium-pressure sub-cylinder 05 is converted into low-grade steam under the action of the second temperature reduction and pressure reduction device 08 and then flows to the low-pressure sub-cylinder 06, so as to solve the problem that the low-grade steam in the low-pressure sub-cylinder 06 does not meet the user's required amount.
[0037] In this embodiment, the first steam extraction device 01 includes: a gate valve, a second electric regulating valve, a pressure reducing valve, a check valve, a second flow meter and a third electric regulating valve connected in sequence; The first steam extraction device 01 adjusts the flow rate of high-grade steam by adjusting the opening of the first electric regulating valve and the second electric regulating valve.
[0038] In this embodiment, the second flow meter is used to monitor the flow of high-quality steam flowing from the high-pressure cylinder 09 to the high-pressure sub-cylinder 04, the second electric regulating valve and the third electric regulating valve are used to control the flow value of the high-quality steam flowing to the high-pressure sub-cylinder 04, and the pressure reducing valve is used to adjust the pressure flowing to the high-quality steam sub-cylinder 04 according to the steam pressure required by the user. The check valve is used to prevent the high-quality steam of the high-pressure sub-cylinder 04 from flowing back to the high-pressure cylinder 09.
[0039] In this embodiment, the second steam extraction device 02 includes: a fourth electric control valve, a first electric check valve, a first hydraulic fast closing valve, a fifth electric control valve and a second temperature and pressure reducing device which are connected in sequence.
[0040] In this embodiment, the second desuperheater and pressure reducer is used to adjust the parameters of the reheated steam (ie, medium-grade steam).
[0041] In this embodiment, the third steam extraction device 03 includes: a second electric check valve and a second hydraulic fast closing valve connected in sequence.
[0042] In this embodiment, the first flow meter is a flow measurement plate. The second flow meter is a flow measurement plate.
[0043] Figure 2 : is a flow chart of the wide load heating method provided by Example 1 of the present invention. Figure 2 As shown, this embodiment provides a wide load heating method, including: S1. The high-grade steam of the generator set is extracted to the high-pressure steam cylinder 04 through the first steam extraction device 01, and the high-grade steam is provided to the user through the high-pressure steam cylinder 04; S2. The medium-grade steam of the generator set is extracted to the medium-pressure sub-cylinder 05 through the second steam extraction device 02, and the medium-grade steam is provided to the user through the medium-pressure sub-cylinder 05; S3. The medium and low-grade steam of the generator set is extracted to the low-pressure sub-cylinder 06 through the third steam extraction device 03, and low-grade steam is provided to the user through the low-pressure sub-cylinder 06.
[0044] In this embodiment, the method further includes: When the medium-grade steam in the medium-pressure sub-cylinder 05 does not meet user demand, the medium-pressure sub-cylinder 05 is connected with the high-pressure sub-cylinder 04 through the first temperature reduction and pressure reduction device 07, and the high-grade steam in the high-pressure sub-cylinder 04 flows to the medium-pressure sub-cylinder 05, and before reaching the medium-pressure sub-cylinder 05, the high-grade steam parameters are reduced to medium grade by the first temperature reduction and pressure reduction device 07.
[0045] In this embodiment, the method further includes: When the low-grade steam in the low-pressure sub-cylinder 06 does not meet user demand, the low-pressure sub-cylinder 06 is connected to the medium-pressure sub-cylinder 05 through the second temperature reduction and pressure reduction device 08, and the medium-grade steam in the medium-pressure sub-cylinder 05 flows to the low-pressure sub-cylinder 06, and before reaching the low-pressure sub-cylinder 06, the second temperature reduction and pressure reduction device 08 reduces the medium-grade steam parameters to low grade.
[0046] Example 2 Figure 3 Schematic diagram of the structure of a multi-unit wide load heating system provided by Example 2 of the present invention. Figure 3 As shown, the present invention provides a multi-unit wide-load heating system, the system comprising: a plurality of generator sets, each generator set is provided with a first steam extraction device 01, a second steam extraction device 02 and a third steam extraction device 03, the output end of each first steam extraction device 01 is connected to the high-pressure sub-cylinder 04, the output end of each second steam extraction device 02 is connected to the medium-pressure sub-cylinder 05, and the output end of each third steam extraction device 03 is connected to the low-pressure sub-cylinder 06.
[0047] In this embodiment, the multi-unit wide-load heating system includes: a first generator set and a second generator set, and the power generation capacity of the first generator set is the same as that of the second generator set.
[0048] In this embodiment, the first extraction device of the first generator set and the first extraction device of the second generator set are respectively connected to the high-pressure cylinder 04, the second extraction device of the first generator set and the second extraction device of the second generator set are respectively connected to the medium-pressure cylinder 05, and the third extraction device of the first generator and the third extraction device of the second generator are respectively connected to the low-pressure cylinder 06.
[0049] When the steam supply of the first generator set does not meet the user's steam supply demand, the steam supply generated by the second generator set is supplemented, and multiple generator sets jointly supply heat to the outside to achieve mutual supplementation between the source and the measurement and extraction of steam.
[0050] In this embodiment, the input end of the first steam extraction device 01 is used to extract high-quality steam from the generator set, and the output end of the first steam extraction device 01 is connected to the high-pressure sub-cylinder 04 to deliver the extracted high-quality steam to the high-pressure sub-cylinder 04; The input end of the second steam extraction device 02 is used to extract the medium-grade steam of the generator set, and the output end of the second steam extraction device 02 is connected to the medium-pressure sub-cylinder 05 to deliver the extracted medium-grade steam to the medium-pressure sub-cylinder 05; The input end of the third steam extraction device 03 is used to extract low-grade steam from the generator set, and the output end of the third steam extraction device 03 is connected to the low-pressure sub-cylinder 06 to deliver the extracted low-grade steam to the low-pressure sub-cylinder 06; The high-pressure sub-cylinder 04 is used to provide high-quality steam to users, the medium-pressure sub-cylinder 05 is used to provide medium-quality steam to users, and the low-pressure sub-cylinder 06 is used to provide low-quality steam to users.
[0051] In this embodiment, by extracting steam from multiple steam source points of the generator set, high-grade steam, medium-grade steam and low-grade steam with different steam parameters are obtained respectively. The user selects steam parameters according to demand, which can not only realize steam supply for users with a wide load and avoid frequent switching operation of multiple steam source points, but also solve the problem that the steam supply parameters cannot be guaranteed when the unit is under low load conditions.
[0052] In this embodiment, the input end of the first steam extraction pipeline is connected to the output end of the high-pressure cylinder 09 of the generator set, and is used to receive a section of extraction steam from the high-pressure cylinder 09; the input end of the second steam extraction pipeline is connected to the input end of the intermediate-pressure cylinder 10, and is used to receive the reheat section extraction steam of the generator set; the input end of the third steam extraction pipeline is connected to the output end of the intermediate-pressure cylinder 10, and is used to receive the middle exhaust extraction steam from the intermediate-pressure cylinder 10.
[0053] In this embodiment, a first temperature reduction and pressure reduction device 07 is provided between the high-pressure sub-cylinder 04 and the medium-pressure sub-cylinder 05 , and the first temperature reduction and pressure reduction device 07 includes: a first temperature reduction and pressure reduction device, a first electric regulating valve and a first flow meter.
[0054] In this embodiment, the high-pressure sub-cylinder 04 and the medium-pressure sub-cylinder 05 are connected through the first temperature reduction and pressure reduction device 07. When the medium-grade steam in the medium-pressure sub-cylinder 05 does not meet the user's required amount, the high-grade steam in the high-pressure sub-cylinder 04 is converted into medium-grade steam under the action of the first temperature reduction and pressure reduction device 07 and then flows to the medium-pressure sub-cylinder 05, so as to solve the problem that the medium-grade steam in the medium-pressure sub-cylinder 05 does not meet the user's required amount.
[0055] In this embodiment, the first flow meter is used to monitor the flow of steam flowing from the high-pressure sub-cylinder 04 to the medium-pressure sub-cylinder 05, the first electric regulating valve is used to control the flow of steam flowing from the high-pressure sub-cylinder 04 to the medium-pressure sub-cylinder 05, and the first temperature and pressure reducing device is used to reduce the temperature and pressure of the steam parameters of the steam flowing from the high-pressure sub-cylinder 04 to the medium-pressure sub-cylinder 05. Further, the steam parameters include: the temperature of the steam and the pressure of the steam.
[0056] In this embodiment, a second temperature reduction and pressure reduction device 08 is provided between the medium-pressure sub-cylinder 05 and the low-pressure sub-cylinder 06 , and the second temperature reduction and pressure reduction device 08 has the same structure as the first temperature reduction and pressure reduction device 07 .
[0057] Similarly, the medium-pressure sub-cylinder 05 and the low-pressure sub-cylinder 06 are connected through the second temperature reduction and pressure reduction device 08. When the low-grade steam in the low-pressure sub-cylinder 06 does not meet the user's required amount, the medium-grade steam in the medium-pressure sub-cylinder 05 is converted into low-grade steam under the action of the second temperature reduction and pressure reduction device 08 and then flows to the low-pressure sub-cylinder 06, so as to solve the problem that the low-grade steam in the low-pressure sub-cylinder 06 does not meet the user's required amount.
[0058] In this embodiment, the first steam extraction device 01 includes: a gate valve, a second electric regulating valve, a pressure reducing valve, a check valve, a second flow meter and a third electric regulating valve connected in sequence, and is used to adjust the opening of the first electric regulating valve and the second electric regulating valve to adjust the high-grade steam.
[0059] In this embodiment, the second flow meter is used to monitor the flow of high-quality steam flowing from the high-pressure cylinder 09 to the high-pressure sub-cylinder 04, the second electric regulating valve and the third electric regulating valve are used to control the flow value of the high-quality steam flowing to the high-pressure sub-cylinder 04, and the pressure reducing valve is used to adjust the pressure flowing to the high-quality steam sub-cylinder 04 according to the steam pressure required by the user. The check valve is used to prevent the high-quality steam of the high-pressure sub-cylinder 04 from flowing back to the high-pressure cylinder 09.
[0060] In this embodiment, the second steam extraction device 02 includes: a fourth electric control valve, a first electric check valve, a first hydraulic fast closing valve, a fifth electric control valve and a second temperature and pressure reducing device which are connected in sequence.
[0061] In this embodiment, the second desuperheater and pressure reducer is used to adjust the parameters of the reheated steam (ie, medium-grade steam).
[0062] In this embodiment, the third steam extraction device 03 includes: a second electric check valve and a second hydraulic fast closing valve connected in sequence.
[0063] In this embodiment, the first flow meter is a flow measurement plate. The second flow meter is a flow measurement plate.
[0064] This embodiment provides a wide load heating method, including: S1. The high-grade steam of the generator set is extracted to the high-pressure steam cylinder 04 through the first steam extraction device 01, and the high-grade steam is provided to the user through the high-pressure steam cylinder 04; S2. The medium-grade steam of the generator set is extracted to the medium-pressure sub-cylinder 05 through the second steam extraction device 02, and the medium-grade steam is provided to the user through the medium-pressure sub-cylinder 05; S3. The medium and low-grade steam of the generator set is extracted to the low-pressure sub-cylinder 06 through the third steam extraction device 03, and low-grade steam is provided to the user through the low-pressure sub-cylinder 06.
[0065] In this embodiment, the method further includes: When the medium-grade steam in the medium-pressure sub-cylinder 05 does not meet user demand, the medium-pressure sub-cylinder 05 is connected with the high-pressure sub-cylinder 04 through the first temperature reduction and pressure reduction device 07, and the high-grade steam in the high-pressure sub-cylinder 04 flows to the medium-pressure sub-cylinder 05, and before reaching the medium-pressure sub-cylinder 05, the high-grade steam parameters are reduced to medium grade by the first temperature reduction and pressure reduction device 07.
[0066] In this embodiment, the method further includes: When the low-grade steam in the low-pressure sub-cylinder 06 does not meet user demand, the low-pressure sub-cylinder 06 is connected to the medium-pressure sub-cylinder 05 through the second temperature reduction and pressure reduction device 08, and the medium-grade steam in the medium-pressure sub-cylinder 05 flows to the low-pressure sub-cylinder 06, and before reaching the low-pressure sub-cylinder 06, the second temperature reduction and pressure reduction device 08 reduces the medium-grade steam parameters to low grade.
[0067] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.
[0068] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
[0069] The optional implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings. However, the implementation modes of the present invention are not limited to the specific details in the above implementation modes. Within the technical concept of the implementation modes of the present invention, a variety of simple modifications can be made to the technical solutions of the implementation modes of the present invention, and these simple modifications all belong to the protection scope of the implementation modes of the present invention. It should also be noted that the various specific technical features described in the above specific implementation modes can be combined in any suitable manner without contradiction, and as long as the combination does not violate the concept of the implementation modes of the present invention, it should also be regarded as the content disclosed in the implementation modes of the present invention.
Claims
1. A wide load heating system, characterized in that: include: A first steam extraction device, a second steam extraction device, a third steam extraction device, a high-pressure steam sub-cylinder, a medium-pressure steam sub-cylinder, and a low-pressure steam sub-cylinder; The input end of the first steam extraction device is used to extract high-grade steam from the generator set, and the output end of the first steam extraction device is connected to the high-pressure sub-cylinder to deliver the extracted high-grade steam to the high-pressure sub-cylinder; The input end of the second steam extraction device is used to extract medium-grade steam from the generator set, and the output end of the second steam extraction device is connected to the medium-pressure sub-cylinder to deliver the extracted medium-grade steam to the medium-pressure sub-cylinder; The input end of the third steam extraction device is used to extract low-grade steam from the generator set, and the output end of the third steam extraction device is connected to the low-pressure sub-cylinder to deliver the extracted low-grade steam to the low-pressure sub-cylinder; The high-pressure sub-cylinder, the medium-pressure sub-cylinder and the low-pressure sub-cylinder are respectively connected to the steam supply mother pipe, and provide high-grade steam, medium-grade steam and low-grade steam to the steam supply mother pipe respectively.
2. The wide load heating system according to claim 1, characterized in that: The high-pressure sub-cylinder and the medium-pressure sub-cylinder are connected via a first connecting pipe, on which a first temperature reduction and pressure reduction device is provided, and the first temperature reduction and pressure reduction device is used to convert high-quality steam into medium-quality steam.
3. The wide load heating system according to claim 2, characterized in that: The medium-pressure sub-cylinder is connected to the low-pressure sub-cylinder via a second connecting pipe, on which a second temperature-reducing and pressure-reducing device is provided, and the second temperature-reducing and pressure-reducing device is used to convert medium-grade steam into low-grade steam.
4. The wide load heating system according to claim 1, characterized in that: The first steam extraction device comprises: a gate valve, a second electric regulating valve, a pressure reducing valve, a check valve, a second flow meter and a third electric regulating valve connected in sequence; The first steam extraction device adjusts the flow rate of high-grade steam by adjusting the opening of the first electric regulating valve and the second electric regulating valve.
5. The wide load heating system according to claim 1, characterized in that: The second steam extraction device comprises: a fourth electric regulating valve, a first electric check valve, a first hydraulic fast closing valve, a fifth electric regulating valve and a second temperature and pressure reducing device which are connected in sequence.
6. The wide load heating system according to claim 1, characterized in that: The third steam extraction device comprises: a second electric check valve and a second hydraulic fast closing valve which are connected in sequence.
7. The wide load heating system according to claim 2, characterized in that: The first flow meter is a flow measurement plate.
8. A multi-unit wide load heating system, characterized in that: It comprises a plurality of generator sets, each of which is provided with a first steam extraction device, a second steam extraction device and a third steam extraction device, the output end of the first steam extraction device of each generator set is connected to the high-pressure sub-cylinder, the output end of the second steam extraction device of each generator set is connected to the medium-pressure sub-cylinder, and the output end of the third steam extraction device of each generator set is connected to the low-pressure sub-cylinder; The input end of the first steam extraction device is used to extract high-grade steam from the generator set, and the output end of the first steam extraction device is connected to the high-pressure sub-cylinder to deliver the extracted high-grade steam to the high-pressure sub-cylinder; The input end of the second steam extraction device is used to extract medium-grade steam from the generator set, and the output end of the second steam extraction device is connected to the medium-pressure sub-cylinder to deliver the extracted medium-grade steam to the medium-pressure sub-cylinder; The input end of the third steam extraction device is used to extract low-grade steam from the generator set, and the output end of the third steam extraction device is connected to the low-pressure sub-cylinder to deliver the extracted low-grade steam to the low-pressure sub-cylinder; The high-pressure sub-cylinder, the medium-pressure sub-cylinder and the low-pressure sub-cylinder are respectively connected to the steam supply mother pipe, and provide high-grade steam, medium-grade steam and low-grade steam to the steam supply mother pipe respectively.
9. The multi-unit wide load heating system according to claim 8, characterized in that: The power generation capacities of the multiple generator sets are equal.
10. A wide load heating method, characterized in that: include: The high-quality steam of the generator set is extracted to the high-pressure steam sub-cylinder through the first steam extraction device, and the high-quality steam is provided to the user through the high-pressure steam sub-cylinder; The medium-grade steam of the generator set is extracted to the medium-pressure steam sub-cylinder through the second steam extraction device, and the medium-grade steam is provided to the user through the medium-pressure steam sub-cylinder; The medium and low-level steam of the generator set is extracted to the low-pressure sub-cylinder through the third steam extraction device, and low-grade steam is provided to users through the low-pressure sub-cylinder.