Steam energy-saving system with cooperation of pressure matcher and heat source for replacement and transformation method

Abstract

The invention discloses a steam energy-saving system with a pressure matcher cooperating with a heat source for replacement and a transformation method, and relates to the field of comprehensive utilization of heat energy in the petrochemical industry, and the steam energy-saving system comprises steam production equipment, the pressure matcher, a low-grade steam pipe network, a high-grade steam pipe network and a hot water pipe network. The low-grade steam pipe network and the high-grade steam pipe network are connected with different steam production devices, so that the steam pressure output by the low-grade steam pipe network is smaller than the steam pressure output by the high-grade steam pipe network; the low-grade steam pipe network and the high-grade steam pipe network are both connected with the pressure matcher, and the pressure matcher adjusts the proportion of input steam of the low-grade steam pipe network and the high-grade steam pipe network so that the steam pressure output by an outlet of the pressure matcher can be the target pressure. And the hot water pipe network is connected with one or more heat users. The double breakthrough of improving the energy efficiency of a steam system of a petrochemical plant and deeply utilizing waste heat resources is achieved, and the efficiency and economic benefits of # imgabs0 # are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of comprehensive utilization of thermal energy in the petrochemical industry, and specifically to an energy-saving transformation scheme for petrochemical plant steam systems that optimizes multi-source steam parameters through a pressure matcher and integrates low-grade heat sources. The scheme is particularly suitable for energy-saving upgrades of steam pipelines in existing petrochemical plants. Background Art

[0002] In the steam pipeline network planning of a petrochemical plant, the grade and classification of the steam pipeline network as well as the steam parameter range and design temperature and pressure of each pipeline network, such as ultra-high pressure steam, high pressure steam, medium pressure steam, and low pressure steam, are usually determined according to the requirements of each process unit and system unit facility in the plant.

[0003] The following technical defects exist in the steam pipe network system of petrochemical enterprises:

[0004] In the prior art, when user-side steam parameters do not match those of the pipeline network, a temperature-reducing and pressure-reducing device is commonly used to adjust the parameters. Using steam with parameters higher than those specified by the user and then reducing the temperature and pressure to supply the user will result in a certain amount of heat source loss. On the other hand, using steam with parameters lower than those specified by the user will not meet the required pressure and temperature. Patent CN222480457U discloses a steam system for an acrylic acid plant. By adding a pressure reducing valve and a temperature-reducing and pressure-reducing device, the 2.0MPa steam is reduced to the same temperature of 1.5MPa. While this improves the turbine steam superheat problem, it does not address the irreversible losses during the pressure reduction process.

[0005] Patent CN210637124U discloses a device for the comprehensive utilization of steam at different pressure levels within a petrochemical plant. It proposes using a pressure matcher to inject saturated exhaust steam to reduce high-pressure steam consumption. However, its design requires coordination with the construction of a new steam pipeline network, and boiler parameters must be adjusted simultaneously during the renovation, resulting in low feasibility of retrofitting existing devices.

[0006] Meanwhile, petrochemical companies generally have a large amount of unused medium- and low-temperature hot water resources (≥80°C), such as steam condensate and process cooling water. These resources have thermal parameters that can meet the heating needs of some low-grade steam users. For example, in an MTBE plant, the kettle temperature of the butene-1 refining tower only needs to be maintained at 65°C. However, in actual operation, 0.4MPa low-pressure saturated steam is used for heating, resulting in a wasteful superheat of approximately 90°C.

[0007] In summary, the defects of the existing scheme are: 1) waste of energy quality, high-quality steam is supplied to low-demand users after decompression, resulting in 1) Inefficiency. 2) Insufficient system flexibility and scalability, and low feasibility of retrofitting existing equipment. 3) Waste heat resources are idle, and a large amount of hot water is not effectively utilized. Summary of the Invention

[0008] The technical problem solved by this application is to overcome the problems of large irreversible loss of steam decompression, low waste heat utilization rate, poor transformation compatibility, etc. in the existing technology, and provide a steam energy-saving system and transformation method that uses a pressure matcher to replace the heat source. By building a cascade energy system that replaces steam with hot water, and using a pressure matcher to optimize the steam energy level, the thermodynamic loss of the decompression process is eliminated, achieving a double breakthrough in improving the energy efficiency of the petrochemical plant steam system and deep utilization of waste heat resources, improving Efficiency and economic benefits.

[0009] Furthermore, it is compatible with the low-cost energy-saving transformation of new plants and existing facilities, and a multi-source steam coordination system with a pressure matcher as the core is constructed. Low-grade steam resources are released through heat source substitution, and low-grade steam resources are integrated to replace and release high-grade steam resources, thus achieving the matching of high and low-grade steam and deep utilization of waste heat.

[0010] The technical solutions provided in this application are as follows:

[0011] A steam energy-saving system for a petrochemical plant using a pressure matcher and heat source substitution, comprising steam production equipment, a pressure matcher, a low-grade steam pipeline network, a high-grade steam pipeline network, and a hot water pipeline network;

[0012] Among the devices that require heating, those whose demand temperature is lower than the hot water temperature in the factory's hot water network are defined as heat users, and those whose demand temperature is higher than that of heat users are defined as steam users.

[0013] The high-grade steam network contains purchased high-grade steam, and the low-grade steam network is connected to the steam production equipment; the steam pressure output by the low-grade steam network is lower than the steam pressure output by the high-grade steam network;

[0014] The low-grade steam network and the high-grade steam network are both connected to a pressure matcher. The pressure matcher adjusts the ratio of steam input from the low-grade steam network and the high-grade steam network to ensure that the steam pressure output from the pressure matcher outlet is the target pressure.

[0015] The hot water network is connected to one or more heat users. The heat source temperature of the hot water network needs to be higher than the temperature required by the heat users, and low-grade steam can be saved by replacing the heat source.

[0016] Furthermore, the hot water pipe network is connected to one or more heat users through one or more branches of the fourth pipe. The heat source temperature of the hot water pipe network is higher than the temperature required by the heat users, and low-grade steam is saved through heat source substitution.

[0017] Furthermore, the pressure matcher is equipped with an intake steam inlet, a driving steam inlet, and a mixed steam outlet. The displaced low-grade steam is delivered to the intake steam inlet of the pressure matcher via a first pipeline. Steam from the high-grade steam network is delivered to the driving steam inlet of the pressure matcher via a second pipeline. The high- and low-grade steam exchange energy within the pressure matcher, raising the low-grade steam pressure to meet the user's pressure requirements. The mixed steam then flows through the pressure matcher outlet and, via a third pipeline, is connected to the steam user.

[0018] Furthermore, the third pipeline is equipped with a pressure transmitter, and the pressure matcher is equipped with an actuator. The pressure transmitter is connected to the actuator of the pressure matcher. The pressure transmitter is used to detect the steam pressure in the third pipeline and transmit the detection results to the actuator. The actuator adjusts the steam ratio input to the pressure matcher from the low-grade steam network and the high-grade steam network based on the detection results. The pressure transmitter and the actuator of the pressure matcher form a closed-loop control, ensuring that the output steam pressure accurately matches the steam user's demand.

[0019] Furthermore, the steam pressure required by the steam user is higher than the steam pressure of the low-grade steam pipeline network and lower than the steam pressure of the high-grade steam pipeline network.

[0020] Furthermore, the steam pressure of the low-grade steam pipeline network is lower than the steam pressure of the high-grade steam pipeline network.

[0021] The steam network system can include network combinations with different pressure gradients, as exemplified below: the low-grade steam network and the high-grade steam network can be a combination of a low-pressure steam network and a medium-pressure steam network, or a combination of a medium-pressure steam network and a high-pressure steam network, or a combination of an ultra-high-pressure steam network and a high-pressure steam network. The steam pressure of the low-pressure steam network is less than 1 MPa; the steam pressure of the medium-pressure steam network is greater than 1 MPa and less than 4 MPa; the steam pressure of the high-pressure steam network is greater than 4 MPa and less than 10 MPa; and the steam pressure of the ultra-high-pressure steam network is greater than 10 MPa. It should be noted that the operating parameters and the aforementioned numerical ranges for the low-grade and high-grade steam networks are merely quantitative representations of typical application scenarios. Those skilled in the art may adjust the aforementioned parameters according to actual needs. Through the dynamic control mechanism of the pressure matcher, the present invention can adapt to any steam network combination with a pressure gradient and is not absolutely limited by the exemplified numerical values.

[0022] A retrofit method for a petrochemical plant steam energy-saving system that uses a pressure matcher in conjunction with heat source replacement in an existing petrochemical plant involves constructing a fourth pipeline connecting to the hot water network, replacing the connection pipeline to the low-grade steam network originally used by heat users. A pressure matcher and supporting pipelines are then added to connect the high-grade steam network, the low-grade steam network, and the steam users. A pressure transmitter is installed on the pipeline connecting the pressure matcher to the steam users to ensure that the output steam pressure matches the steam user's needs.

[0023] In summary, this application has at least the following beneficial technical effects:

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1) The present invention replaces the traditional temperature and pressure reduction device with a pressure matcher, and uses high-grade steam to inject low-grade steam to generate target pressure steam, thereby improving Efficiency, saving high-grade steam.

[0026] 2) This invention utilizes hot water to replace low-grade steam by constructing a temperature-gradient-adaptive low-grade heat source replacement system. The replaced steam is then mixed with high-grade steam in a pressure matcher and pressurized, creating an optimized energy-level pathway for low-grade steam to replace high-grade steam, thereby increasing steam network utilization across the entire plant.

[0027] 3) The present invention is based on an actuator and a PID control module to adjust the pressure matcher, which is flexible and the output steam pressure can be continuously adjusted within the range of low-grade steam and high-grade steam, meeting the pressure adaptation needs of steam users that originally relied on a desuperheater and pressure reducer.

[0028] 4) This invention is universally applicable to new plant designs, optimizing the rated load of high-grade steam boilers and reducing initial investment costs. Existing plant renovations require only the addition of a pressure adapter and supporting piping, achieving a steam network upgrade while maintaining the original boiler operating parameters. This approach offers significant energy savings with low investment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the steam energy-saving system and transformation method for pressure matching device coordinated heat source replacement according to the present invention.

[0030] Figure 2 Schematic diagram of the pressure matcher described in the present invention.

[0031] Figure 3 Schematic diagram of the steam system of an existing petrochemical plant.

[0032] Explanation of the accompanying symbols: 1. Pressure matcher, 2. First pipeline, 3. Low-grade steam pipeline network, 4. Second pipeline, 5. High-grade steam pipeline network, 6. Third pipeline, 7. Steam user, 8. Pressure transmitter, 9. Heat user, 10. Fourth pipeline, 11. First branch of the fourth pipeline, 12. Hot water pipeline network, 13. Heat user, 14. Second branch of the fourth pipeline, 15. Pressure matcher suction steam inlet, 16. Pressure matcher drive steam inlet, 17. Pressure matcher outlet, 18. Actuator, 19. Desuperheating and pressure reducing device, 20. Desuperheating water pipeline, 21. First branch of the first pipeline, 22. Second branch of the first pipeline. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of this application clearer, the embodiments disclosed in this application will be described in further detail below with reference to the accompanying drawings.

[0034] This application is mainly used to transform the steam pipeline network of existing factories that use desuperheating and pressure reducing devices. The low-grade steam pipeline network is connected to the steam production equipment (such as boilers) in the factory for providing steam, and the high-grade steam pipeline network is for purchasing high-grade steam. The steam pipeline network is used to provide heat to the equipment that requires heat in the factory's production system. Among them, among the equipment that requires heat, the equipment with a demand temperature lower than the hot water temperature in the factory's hot water pipeline network is defined as a heat user, and the equipment with a demand temperature higher than the demand temperature of the heat user is defined as a steam user 7. Both the heat users and steam users 7 of the steam pipeline network using a desuperheating and pressure reducing device use high-grade steam and / or low-grade steam for heating.

[0035] For existing factories, the low-grade steam pipeline network connecting steam production equipment (such as boilers) is already designed and installed. The output and pressure of low-grade steam produced by the factory's steam production equipment are relatively fixed, and the output of low-grade steam is designed according to the needs of the production system. For example, a factory can produce steam at a lower fixed pressure, whose output fluctuates less within the designed range. The factory also purchases steam at a higher fixed pressure. When the temperature required by the equipment to be heated differs from the fixed pressure of the factory's steam, the existing fixed-pressure steam needs to be adjusted to the required pressure.

[0036] This application uses a pressure matcher 1, combined with two types of steam with fixed pressures (low-grade steam and high-grade steam) for regulation, and obtains steam of target pressure at the outlet of the pressure matcher 1. However, since it is a transformation, the low-grade steam originally produced has its use, and there is not enough low-grade steam to be used together with the high-grade steam pipe to adjust the steam to the target pressure. Therefore, this application utilizes the hot water of the hot water pipe network 12, and uses the hot water of the hot water pipe network 12 to supply heat to heat users, so that more low-grade steam is used for the pressure matcher 1, that is, low-grade steam is saved by replacing the heat source. The purpose of the transformation is achieved, low-grade steam is replaced by hot water from the hot water pipe network 12, and target pressure steam is generated by injecting low-grade steam through high-grade steam, which saves high-grade steam and saves the cost of purchasing high-grade steam.

[0037] Reference Figure 1 and Figure 2 As shown, an embodiment of the present application proposes a steam energy-saving system for a petrochemical plant with a pressure matcher and a heat source replacement, comprising: a pressure matcher 1, a low-grade steam network 3, a high-grade steam network 5, a hot water network 12, a steam user 7, a heat user and connecting pipes, wherein the connecting pipes include a first pipe 2, a second pipe 4, a third pipe 6 and a fourth pipe 10. The high-grade steam network 5 contains purchased high-grade steam, and the low-grade steam network 3 is connected to the steam production equipment. The steam pressure provided by the low-grade steam network 3 is lower than the steam pressure provided by the high-grade steam network 5. The heat source medium of the hot water network 12 comes from the hot water used up by the water boiler and / or other equipment (other equipment includes heat exchangers, etc.). The hot water network 12 has one or more branches, and the temperatures of different branches are the same or different, so as to meet the needs of heat users with different temperature requirements.

[0038] The pressure matcher 1 has a suction steam inlet 15 connected to a low-grade steam network 3 via a first pipe 2, a driving steam inlet 16 connected to a high-grade steam network 5 via a second pipe 4, and a mixed steam outlet 17 connected to a steam user 7 via a third pipe 6. The third pipe 6 is equipped with a pressure transmitter 8 and connected to a pressure matcher actuator 18.

[0039] Hot water network 12 connects to one or more heat users via fourth pipeline 10. The heat source temperature of hot water network 12 must be higher than the temperature required by the heat users. Heat source substitution saves low-grade steam. In this embodiment, there are two heat users, heat user 9 and heat user 13. Hot water network 12 provides heat to heat users 9 and 13 via first branch 11 and second branch 14 of fourth pipeline 10, respectively.

[0040] The low-grade steam pipeline network 3 and the high-grade steam pipeline network 5 can be a combination of a low-pressure steam pipeline network and a medium-pressure steam pipeline network, or a combination of a medium-pressure steam pipeline network and a high-pressure steam pipeline network. The steam pressure of the low-pressure steam pipeline network is less than 1 MPa, the steam pressure of the medium-pressure steam pipeline network is greater than 1 MPa and less than 3.5 MPa, and the steam pressure of the high-grade steam pipeline network is greater than 4 MPa.

[0041] The steam pressure required by steam user 7 is higher than the steam pressure of the low-grade steam pipeline network and lower than the steam pressure of the high-grade steam pipeline network.

[0042] The heat source temperature of the hot water pipe network 12 is greater than the temperature required by the heat users.

[0043] The specific working process of the present invention is:

[0044] Hot water from the hot water network 12 is delivered to heat users 9 and 13 via the first branch 11 and the second branch 14 of the fourth pipeline 10. The hot water from the hot water network serves as a heat source, replacing the steam from the low-grade steam network 3 in the prior art, saving low-grade steam consumption.

[0045] The saved low-grade steam is delivered to the pressure matcher's suction steam inlet 15 via the first pipeline 2. Steam from the high-grade steam network 5 is delivered to the pressure matcher's driving steam inlet 16 via the second pipeline 4. The low-grade steam within the pressure matcher 1 is pressurized and then output from outlet 17. A third pipeline 6 is connected to the pressure matcher outlet 17 and is equipped with a pressure transmitter 8. Based on the pressure required by the steam user 7, the pressure transmitter 8 adjusts its internal structure through the pressure matcher actuator 18 to change the flow rate of high-grade steam, ensuring that the pressure at the pressure matcher outlet 17 meets the user's needs.

[0046] This technical solution constructs a low-grade heat source replacement system, uses hot water to replace low-grade steam, and then uses a pressure matcher to boost the pressure of the low-grade steam saved by waste heat replacement and supply it to steam user 7, thereby saving high-grade steam consumption.

[0047] The present application also provides a method for modifying a petrochemical plant steam energy-saving system using a pressure matcher in conjunction with heat source replacement, including:

[0048] Reference Figure 1 , Figure 3As shown, in the case of an MTBE (methyl tertiary butyl ether) and butadiene production system, that is, taking an existing MTBE (methyl tertiary butyl ether) and butadiene plant at a certain petrochemical plant as an example, heat users 9 and 13 (butene-1 refining tower reboiler) of the MTBE plant originally maintained their temperature (65°C) using low-pressure steam (0.4 MPa) from low-grade steam network 3. The butadiene plant originally used medium-pressure steam (1 MPa) from high-grade steam network 5 and desuperheated water from hot water network 12 to reduce the temperature and pressure in desuperheater 19, with the output steam (0.75 MPa) supplied to steam user 7 (stripping tower reboiler).

[0049] In this embodiment, the first pipeline 2 connecting heat users 9 and 13 to the low-grade steam network 3 is replaced by a fourth pipeline 10 connected to the hot water network 12. This connection to the hot water network 12 uses hot water (90°C) instead of steam as the heat source, saving 20 tons of low-pressure steam per hour.

[0050] The embodiment adds a pressure matcher 1, whose steam suction inlet 15 is connected to the low-grade steam network 3 through the first pipe 2, and its outlet 17 is connected to the steam user 7 through the third pipe 6. 20t / h of replaced low-pressure steam enters the pressure matcher 1 through the first pipe 2 and mixes with the medium-pressure steam (1.0MPa) from the high-grade steam network 5. The pressure matcher 1 dynamically adjusts the mixing ratio of high-grade and low-grade steam through the actuator 18, and outputs 0.75MPa steam to supply the stripping tower reboiler. Compared with the original solution of using a temperature and pressure reducer 19 to reduce the pressure of high-grade steam and then supply it to the stripping tower reboiler, this embodiment saves 20 tons of medium-pressure steam per hour.

[0051] The steam energy-saving system of the present invention achieves a dual breakthrough in energy efficiency improvement and energy-saving transformation applicability through the pressure matching device and heat source cascade reconstruction. Compared with the existing technology, the specific technical advantages are as follows:

[0052] 1) Energy quality optimization: The present invention uses a pressure matching device to replace the traditional temperature and pressure reduction device, eliminating the loss of steam pressure reduction quality and saving high-quality steam. Taking Example 1 as an example, the pressure matching device is used to mix high-quality steam and low-quality steam to make the target steam The efficiency is increased from 52.3% of the traditional solution to 78.6%, saving 20t / h of medium-pressure steam.

[0053] 2) Heat source cascade replacement: This invention uses hot water to replace low-grade steam by constructing a low-grade heat source replacement system with a temperature gradient adaptability. The replaced steam is mixed with high-grade steam and pressurized via a pressure matcher, forming an energy-level optimized path for low-grade steam to replace high-grade steam, thereby improving the utilization rate of the steam network throughout the plant. Taking Example 1 as an example, in the MTBE unit, 90°C hot water replaces low-pressure steam, which is then pressurized via a pressure matcher and supplied to steam users, saving 20t / h of medium-pressure steam.

[0054] 3) Flexible pressure regulation and adaptability: The present invention forms a closed-loop regulation system through the coordinated operation of the actuator of the pressure matcher and the outlet pressure PID control module. The output steam pressure can be continuously adjusted within the range of input low-grade steam and high-grade steam, meeting the energy adaptation needs of steam users in petrochemical plants that originally required pressure reduction (such as stripping towers, distillation towers and other equipment).

[0055] 4) Universal Engineering Implementation: This invention is compatible with both new construction and steam system retrofits for existing plants. New construction can reduce the load on medium-pressure boilers, minimizing initial investment. Retrofits of existing plants require only the addition of a pressure adapter and supporting piping, achieving a steam network upgrade while maintaining the original boiler operating parameters. This approach offers significant energy savings with low investment costs.

[0056] The contents not described in detail in this application specification are common knowledge to those skilled in the art.

[0057] The present application has been described in detail above with reference to specific embodiments and exemplary examples. However, these descriptions should not be construed as limiting the present application. Those skilled in the art will appreciate that, without departing from the spirit and scope of the present application, various equivalent substitutions, modifications, or improvements may be made to the technical solutions and implementations of the present application, all of which fall within the scope of the present application. The scope of protection of the present application shall be determined by the appended claims.

Claims

1. A steam energy-saving system with a pressure matcher and heat source replacement, characterized by: It includes steam production equipment, a pressure matching device (1), a low-grade steam pipe network (3), a high-grade steam pipe network (5) and a hot water pipe network (12); Among the devices that need heat supply, the devices whose demand temperature is lower than the hot water temperature in the hot water network (12) in the factory are defined as heat users, and the devices whose demand temperature is higher than the demand temperature of heat users are defined as steam users (7); The high-grade steam network contains high-grade steam, and the low-grade steam network (3) is connected to the steam production equipment; the steam pressure output by the low-grade steam network (3) is lower than the steam pressure output by the high-grade steam network (5); The low-grade steam pipe network (3) and the high-grade steam pipe network (5) are both connected to the pressure matcher (1). The pressure matcher (1) adjusts the flow rate of the high-grade steam input from the high-grade steam pipe network (5) so that the steam pressure output from the outlet of the pressure matcher (1) is the target pressure. The hot water pipe network (12) is connected to one or more heat users. The heat source temperature of the hot water pipe network (12) needs to be higher than the temperature required by the heat users, and low-grade steam can be saved by replacing the heat source.

2. The steam energy-saving system with pressure matching device and heat source replacement according to claim 1 is characterized by: The pressure matcher (1) is provided with a suction steam inlet (15), a driving steam inlet (16) and a mixed steam outlet (17); the suction steam inlet (15) is connected to a low-grade steam network (3) through a first pipe (2); the driving steam inlet (16) is connected to a high-grade steam network (5) through a second pipe (4); and the mixed steam outlet (17) is connected to a steam user (7) through a third pipe (6).

3. The steam energy-saving system with pressure matching device and heat source replacement according to claim 2, characterized in that: The third pipeline (6) is equipped with a pressure transmitter (8), and the pressure matching device (1) is provided with an actuator (18). The pressure transmitter (8) is connected to the pressure matching device actuator (18). The pressure transmitter (8) is used to detect the steam pressure in the third pipeline (6) and send the detection result to the actuator (18). The actuator (18) adjusts the steam ratio of the low-grade steam pipeline network (3) and the high-grade steam pipeline network (5) input to the pressure matching device (1) according to the detection result.

4. The steam energy-saving system with a pressure matching device and heat source substitution according to claim 1 is characterized by: The steam pressure required by the steam user (7) is higher than the steam pressure of the low-grade steam pipeline network (3) and lower than the steam pressure of the high-grade steam pipeline network (5).

5. The steam energy-saving system with pressure matching device and heat source replacement according to claim 1 is characterized by: The steam pressure of the low-grade steam pipeline network (3) is lower than the steam pressure of the high-grade steam pipeline network (5).

6. The steam energy-saving system with pressure matching device and heat source replacement according to claim 6 is characterized by: The low-grade steam pipeline network (3) and the high-grade steam pipeline network (5) are a combination of a low-pressure steam pipeline network and a medium-pressure steam pipeline network, or a combination of a medium-pressure steam pipeline network and a high-pressure steam pipeline network, or a combination of an ultra-high-pressure steam pipeline network and a high-pressure steam pipeline network; the steam pressure of the low-pressure steam pipeline network is less than 1MPa; the steam pressure of the medium-pressure steam pipeline network is 1MPa-4MPa; the steam pressure of the high-pressure steam pipeline network is 4MPa-10MPa; and the steam pressure of the ultra-high-pressure steam pipeline network is greater than 10MPa.

7. The steam energy-saving system with pressure matching device and heat source substitution according to claim 1, characterized in that: The hot water pipe network (12) is connected to a fourth pipe (10), and the fourth pipe (10) is connected to a plurality of branches. The heat source temperatures at outlets of different branches are the same or different, and the outlets of the branches are connected to heat users.

8. A method for transforming a steam energy-saving system with a pressure matching device and heat source substitution according to any one of claims 1 to 7, characterized in that: include: Building a fourth pipeline (10) connected to the hot water network (12), and connecting the fourth pipeline (10) to the heat user; A pressure matcher (1) is provided, and the pressure matcher (1) is connected to a high-grade steam pipeline network (5), a low-grade steam pipeline network (3) and a steam user (7). The low-grade steam pipeline network (3) and the high-grade steam pipeline network (5) input steam to the pressure matcher (1). The pressure matcher (1) controls the input steam flow rate so that the steam pressure output to the steam user (7) meets the set pressure.

9. The transformation method according to claim 10, characterized in that: A pressure transmitter (8) is installed on the connecting pipe between the pressure matching device (1) and the steam user (7), and the pressure transmitter (8) is connected to the actuator (18) of the pressure matching device (1).

Images