Multi-unit condensate water circulation system

Abstract

The utility model relates to a kind of multi-unit condensate circulating systems, comprising: first deaerator, inlet through first condensate main pipe connection condensate pump of first thermal system, outlet connects the boiler of first thermal system;Second deaerator, inlet through second condensate main pipe connection condensate pump of second thermal system, outlet connects the boiler of second thermal system;Third deaerator, inlet through third condensate main pipe connection condensate pump of third thermal system, outlet connects the boiler of third thermal system;Fourth deaerator, inlet through fourth condensate main pipe connection first to third condensate main pipe, outlet connects the boiler of fourth thermal system.The utility model interconnects the condensate produced in each thermal system steam turbine, breaks the original condensate in each thermal system relatively independent limit, realizes the interconnection and flexible deployment of condensate between multiple units, improves the delivery efficiency and use efficiency of condensate.

Description

Technical Field

[0001] This utility model relates to the field of energy-saving technology for thermal systems, specifically to a multi-unit condensate circulation system. Background Technology

[0002] In industrial production, especially in sectors involving thermal cycle systems such as power and chemical industries, the effective recovery and rational utilization of condensate is crucial for improving system energy efficiency and controlling costs. As enterprises expand their production scale and upgrade their processes, existing thermal systems often become unable to meet new operational demands due to design limitations and changes in operating conditions.

[0003] In the company's production and operation system, there were originally four phases of thermal system projects. In the first phase project, the high-temperature and high-pressure steam (pressure: 8.83MPa, temperature: 540℃) produced by boilers 1 to 3 (3*130T / H circulating fluidized bed boilers) was completed in the No. 1 steam turbine and then condensed into water through the No. 1 steam turbine condenser. The condensate (pressure: 1.6MPa, temperature: 40℃) was then transported to the first-phase deaerator through the condensate header by the three condensate pumps of the No. 1 steam turbine, and then transported to boilers 1 to 3 through the feedwater pump. In the second phase of the project, the high-temperature and high-pressure steam (pressure: 8.83MPa, temperature: 540℃) produced by boilers 4-6 (3*220T / H circulating fluidized bed boilers) is processed in turbines 2 and 3. The steam is then condensed into water in the condensers of turbines 2 and 3. The condensate (pressure: 1.6MPa, temperature: 40℃) is then transported to the second-phase deaerator through the condensate header by three condensate pumps from turbines 2 and 3, and then pumped to boilers 4-6 by feedwater pumps. In the third phase of the project, the high-temperature, high-pressure steam (pressure: 8.83MPa, temperature: 540℃) produced by boiler #7 (1*480T / H pulverized coal boiler) is processed in turbine #4. The steam is then condensed into water by the turbine condenser. The condensate (pressure: 1.6MPa, temperature: 40℃) is then pumped through the condensate header to the third-phase deaerator via three condensate pumps from turbine #4, and finally pumped back to boiler #7 via feedwater pumps. In the fourth phase of the project, only a fourth-phase deaerator is installed, serving the first phase. Specifically, because the first phase project has a long operating time, the boilers within it need to be shut down, but the turbines connected to other power equipment can still operate. Therefore, to recycle the condensate from the first phase, a fourth-phase deaerator is installed to treat the condensate before discharging it into the chemical plant, from where it is distributed to downstream equipment via interconnected systems.

[0004] With the expansion of the company's production scale and the upgrading of its technology, the company has built a new fifth phase thermal system project in its production operation system. In the fifth phase project, only boiler No. 8 (1*480T / H pulverized coal boiler) is installed, without steam turbine.

[0005] With the commissioning of the fifth phase of the project, boiler #8 (480T / H) was put into operation, significantly changing the company's production and operating conditions. In order to save energy, reduce consumption, and decrease the frequency of equipment commissioning, boilers #7 and #8 continued to operate, while the three 130T / H boilers of the first phase and the three 220T / H boilers of the second phase were forced to shut down. The operating conditions of the steam turbines also changed accordingly, with turbines #1, #2, #3, and #4 operating and the deaerator feedwater system (including feedwater pumps and deaerators) shut down. This made it difficult for the original condensate system to meet the current production requirements.

[0006] Currently, although the reserved outlet of the Phase V deaerator is connected to the DN600 condensate main pipe under the Phase III and Phase V pipe corridor via a DN250 pipe, this pipeline is only used as the Phase V condensate pipeline and has not fully utilized its function of connecting the condensate systems of different phases. Calculations show that under operating conditions of 1.6 MPa pressure and water as the medium, based on the empirical flow velocity method (the flow velocity in engineering water pipes is usually taken as 1.5 m / s), the design flow rate of the DN250 pipeline can reach 264.94 m³ / h. However, the existing system has failed to effectively utilize the potential of this pipeline to achieve efficient condensate distribution.

[0007] The problems with the condensate system in Phase II are particularly prominent. When turbines #2 and #3 are running, the condensate they produce cannot be effectively utilized. According to equipment parameters, the Phase II condensate pumps A / B / C have a power of 55 kW, a current of 82.2 A, a rated flow rate of 55 m³ / h, and a condensate pressure of 1.6 MPa. In actual operation, when a single turbine #2 or #3 is running at a load of 25 MW, although the condensate pump pressure is maintained at 1.6 MPa, the flow rate is only 45 m³ / h; when two turbines are running in parallel, the flow rate only reaches 90 m³ / h. This condensate cannot be smoothly transported to the Phase V deaerator, resulting not only in a waste of water resources and heat energy but also affecting the stable operation of turbines #2 and #3, increasing equipment energy consumption and operating costs.

[0008] In addition, the original first, second and third phase condensate systems were relatively independent and lacked an effective coordination and optimization mechanism. When faced with new operating conditions, it was difficult to achieve flexible allocation and efficient transportation of condensate, resulting in reduced system reliability and low energy utilization efficiency. Utility Model Content

[0009] This utility model provides a multi-unit condensate circulation system to solve at least one of the above-mentioned technical problems.

[0010] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a multi-unit condensate circulation system for circulating condensate generated by multiple thermal systems; the thermal systems include a first thermal system, a second thermal system, a third thermal system, and a fourth thermal system; wherein, the first to third thermal systems each include a boiler, a steam turbine, a condenser, and a condensate pump connected in sequence; the fourth thermal system includes a boiler; the boiler of the fourth thermal system is connected to the steam turbines of the first and second thermal systems; The multi-unit condensate system includes: The first deaerator has its inlet connected to the condensate pump of the first thermal system via the first condensate header, and its outlet connected to the boiler of the first thermal system. The second deaerator has its inlet connected to the condensate pump of the second thermal system via the second condensate header, and its outlet connected to the boiler of the second thermal system. The third deaerator has its inlet connected to the condensate pump of the third thermal system via the third condensate header, and its outlet connected to the boiler of the third thermal system. The fourth deaerator has its inlet connected to the first to third condensate headers via the fourth condensate header, and its outlet connected to the boiler of the fourth thermal system.

[0011] Based on the above technical solution, the present invention can be further improved as follows.

[0012] Furthermore, a shut-off valve is provided on both sides of the condensate pump connection of the corresponding first to third condensate headers; a shut-off valve is provided on the fourth condensate header near the inlet of the fourth deaerator.

[0013] Furthermore, the boilers of the first thermal system include three 130T / H circulating fluidized bed boilers, the boilers of the second thermal system include three 220T / H circulating fluidized bed boilers, the boilers of the third thermal system include one 480T / H pulverized coal boiler, and the boilers of the fourth thermal system include one 480T / H pulverized coal boiler.

[0014] Furthermore, the first thermal system has one steam turbine, the second thermal system has two steam turbines, and the third thermal system has one steam turbine.

[0015] Furthermore, the condensate pump of the second thermal system is a pump with adjustable operating parameters.

[0016] Furthermore, a flow regulating valve is provided on the inlet pipe of the fourth deaerator and / or the outlet pipe of the condensate pump of the second thermal system.

[0017] Furthermore, the flow regulating valve is specifically a first electric regulating valve based on PID control.

[0018] Furthermore, the fourth condensate header is equipped with a first pressure monitoring and regulating device, and the second condensate header is equipped with a second pressure monitoring and regulating device.

[0019] Furthermore, the first pressure monitoring and regulation device includes a first pressure transmitter installed on the fourth condensate header, a second pressure transmitter installed on the inlet pipe of the fourth deaerator, and a self-regulating pressure regulating valve installed on the fourth condensate header; the second pressure monitoring and regulation device includes a third pressure transmitter and a second electric regulating valve installed on the second condensate header.

[0020] Furthermore, it also includes: a fifth deaerator, with its inlet connected to the first condensate mother pipe and its outlet connected to an external chemical plant.

[0021] The beneficial effects of this utility model are as follows: This utility model's multi-unit condensate circulation system interconnects the condensate generated by the turbines in each thermal system through a condensate header, breaking the limitation of the relatively independent condensate in each thermal system. It realizes the interconnection and flexible allocation of condensate among multiple units, improves the transportation and utilization efficiency of condensate, optimizes the overall operating performance of the thermal system, and enhances the production efficiency and economic benefits of the enterprise. At the same time, it avoids the waste of condensate, realizes the efficient utilization of water resources and heat energy, reduces the enterprise's dependence on external water resources and energy, significantly reduces energy consumption, and lowers production and operating costs. Attached Figure Description

[0022] Figure 1 This is a structural block diagram of a multi-unit condensate circulation system according to the present invention; Figure 2 This is a schematic diagram of the structure of a multi-unit condensate circulation system according to the present invention. Detailed Implementation

[0023] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0024] like Figure 1 As shown, a multi-unit condensate circulation system is used to circulate condensate generated by multiple thermal systems; the thermal systems include a first thermal system, a second thermal system, a third thermal system, and a fourth thermal system; wherein, the first to third thermal systems each include a boiler, a steam turbine, a condenser, and a condensate pump connected in sequence; the fourth thermal system includes a boiler; the boiler of the fourth thermal system is connected to the steam turbines of the first and second thermal systems; The multi-unit condensate system includes: The first deaerator has its inlet connected to the condensate pump of the first thermal system via the first condensate header, and its outlet connected to the boiler of the first thermal system. The second deaerator has its inlet connected to the condensate pump of the second thermal system via the second condensate header, and its outlet connected to the boiler of the second thermal system. The third deaerator has its inlet connected to the condensate pump of the third thermal system via the third condensate header, and its outlet connected to the boiler of the third thermal system. The fourth deaerator has its inlet connected to the first to third condensate headers via the fourth condensate header, and its outlet connected to the boiler of the fourth thermal system. The fifth deaerator has its inlet connected to the first condensate header and its outlet connected to an external chemical plant.

[0025] The project comprises three phases: Phase I (first thermal system), Phase II (second thermal system), Phase III (third thermal system), Phase IV (fifth deaerator), and Phase V (fourth thermal system). Phase I includes three 130T / H circulating fluidized bed boilers (Boilers #1, #2, and #3). Phase II includes three 220T / H circulating fluidized bed boilers (Boilers #4, #5, and #6). Phase III includes one 480T / H pulverized coal boiler, and Phase IV includes two 480T / H pulverized coal boilers (Boilers #7 and #8). The first thermal system has one steam turbine, namely turbine #1; the second thermal system has two steam turbines, namely turbine #2 and turbine #3; the third thermal system has one steam turbine, namely turbine #4; and the fourth thermal system has no steam turbine.

[0026] This utility model connects the reserved port of the fourth deaerator to the first to third condensate headers through the fourth condensate header. The pipeline is designed according to the standard of 1.6MPa pressure and 1.5m / s water velocity to achieve a design flow rate of 264.94m³ / h, thus establishing an interconnected transmission channel for condensate.

[0027] In some embodiments, such as Figure 2 As shown, a shut-off valve 1 is provided on both sides of the condensate pump connection of the first to third condensate headers and the corresponding first to third thermal systems; a shut-off valve 1 is provided on the fourth condensate header and near the inlet of the fourth deaerator.

[0028] Gate valves are used to control the opening and closing of pipelines, facilitating pipeline inspection and maintenance. Additionally, by controlling the opening and closing of corresponding gate valves, condensate circulation along different paths can be achieved. For example, in the fourth thermal system, after boiler #8 is put into operation, boilers #1-6 are shut down, and boilers #7-8 are operating in parallel, the gate valves controlling the inlet water of the first, second, and fourth deaerators can be closed, while the gate valve controlling the condensate entering the fourth condensate header can be opened.

[0029] Specifically, after boiler #8 in the fourth thermal system is put into operation, boilers #4, #5, and #6 will be shut down, while turbines #2 and #3 will be running (the second deaerator will be shut down). Condensate from the second thermal system will not enter the second deaerator; instead, it will be supplied separately through the interconnected pipeline for the fifth phase of the thermal system. Simultaneously, after boiler #8 in the fourth thermal system is put into operation, boilers #1, #2, and #3 will be shut down, while turbine #1 will be running (the first deaerator will be shut down). Condensate from the first thermal system will not enter the first deaerator; instead, it will be introduced separately into the fifth deaerator to meet the condensate circulation needs of turbine #1 after boiler #1 is shut down. Because boiler #8 is operational, the fifth deaerator will not need to be operated again to save energy, reduce consumption, and decrease equipment operation frequency. Furthermore, a reserved opening in the pipeline between the first thermal system's condensate supply and the fourth deaerator will be provided together with the condensate from the second thermal system to the fourth deaerator. Furthermore, after the No. 8 boiler in the fourth thermal system is put into operation, it will operate in parallel with the No. 7 boiler in the third thermal system. Part of the condensate produced by the No. 2 and No. 3 turbines can be supplied to the third deaerator, and the other part can be supplied to the fourth deaerator.

[0030] In some embodiments, the condensate pump of the second thermal system is a pump with adjustable operating parameters.

[0031] Specifically, the optimization of the condensate pump parameters of the second thermal system is to ensure that the 45 m³ / h condensate generated by a single No. 2 or No. 3 turbine, and the 90 m³ / h condensate generated by the parallel operation of two No. 2 and No. 3 turbines, can be safely and stably delivered to the fourth deaerator. This includes adapting the parameters of the condensate pumps in the second thermal system. The parameters of the condensate pumps in the second thermal system are: A / B / C power 55KW, current 82.2A, flow rate 55 m³ / h, condensate pressure 1.6MPa. By reasonably adjusting the operating parameters of the condensate pumps in the second thermal system, a stable condensate delivery is guaranteed.

[0032] In some embodiments, a flow regulating valve is provided on the inlet pipe of the fourth deaerator and / or the outlet pipe of the condensate pump of the second thermal system.

[0033] Preferably, the flow regulating valve is a first electric regulating valve based on PID control.

[0034] Specifically, the flow regulating valve is used to regulate the condensate flow rate. It can flexibly control the condensate delivery volume according to the needs of different operating conditions of each unit, ensuring stable flow and efficient operation of the entire condensate system.

[0035] The flow regulating valve is a first-stage electric regulating valve based on PID control, which has advantages such as high regulation accuracy, fast response speed, and remote control capability. Based on the design flow rate and pressure of the pipeline, an electric flow regulating valve of appropriate diameter and pressure rating is selected to ensure that it can meet the flow regulation requirements of the condensate circulation system. The electric flow regulating valve adopts PID regulation, automatically adjusting the valve opening by receiving the flow setting signal and actual flow feedback signal from the control system to achieve precise control of the condensate flow rate.

[0036] The flow control valve is installed near the connection between the fourth and second condensate headers, such as near the inlet pipe of the fourth deaerator and / or the outlet pipe of the condensate pump of the second thermal system. During installation, ensure sufficient straight pipe lengths before and after the flow control valve to guarantee its regulating performance and measurement accuracy. Simultaneously, equip the flow control valve with necessary accessories, such as a valve positioner and handwheel mechanism, to facilitate commissioning, maintenance, and manual operation in case of malfunction.

[0037] In some embodiments, the fourth condensate header is provided with a first pressure monitoring and regulating device, and the second condensate header is provided with a second pressure monitoring and regulating device.

[0038] Preferably, the first pressure monitoring and regulating device includes a first pressure transmitter installed on the fourth condensate header, a second pressure transmitter installed on the inlet pipe of the fourth deaerator, and a self-regulating pressure regulating valve installed on the fourth condensate header; the second pressure monitoring and regulating device includes a third pressure transmitter and a second electric regulating valve installed on the second condensate header.

[0039] Specifically, the pressure monitoring and regulation device includes a pressure monitoring device and a pressure regulation device. The pressure monitoring device (such as a pressure transmitter) is used to monitor the pressure of the condensate circulation system in real time. Based on changes in system operating conditions, it precisely adjusts the flow rate and pressure to ensure stable operation of the condensate system under various conditions, achieving efficient and energy-saving condensate recovery. When abnormal fluctuations occur in the system pressure, the pressure regulation device can respond quickly and adjust accordingly, ensuring that the condensate circulation system always operates stably at 1.6 MPa pressure, avoiding damage to system equipment due to abnormal pressure, and improving the safety and reliability of system operation.

[0040] Pressure transmitters are installed at key locations in the condensate circulation system, such as on the fourth condensate header, the second condensate header, and the inlet of the fourth deaerator. High-precision, high-reliability pressure transmitters are selected to accurately measure the pressure within the pipeline in real time and convert the pressure signal into a standard 4-20mA electrical signal for transmission to the control system. Pressure gauges are also installed on-site for operators to visually observe the pipeline pressure.

[0041] The pressure regulating device employs a combination of self-operated and electrically operated pressure regulating valves. The self-operated pressure regulating valve, installed on the fourth condensate header, automatically adjusts its opening based on pressure changes within the pipeline, achieving initial pressure regulation and stabilization. The second electrically operated regulating valve, installed on the second condensate header, receives pressure regulation signals from the control system to precisely regulate the pressure. When the system pressure exceeds the set upper limit, the electrically operated regulating valve automatically opens wider, increasing condensate discharge and reducing system pressure; conversely, when the system pressure falls below the set lower limit, the electrically operated regulating valve automatically closes, reducing condensate discharge and increasing system pressure.

[0042] The following requirements apply when constructing the multi-unit condensate circulation system of this utility model: Pipeline construction: Seamless steel pipes conforming to industrial standards were used. The fourth deaerator's reserved opening was welded to the first to third condensate headers via the fourth condensate header. During welding, welding process specifications were strictly followed, using argon arc welding for the root pass and electric arc welding for the fill and cover passes to ensure weld quality and avoid defects such as porosity, slag inclusions, and incomplete penetration. After welding, 100% ultrasonic testing was performed on the weld to ensure that the internal quality of the welded joint met the relevant standards for pressure pipelines.

[0043] Pipeline Support and Fixing: Pipeline supports and hangers should be rationally arranged according to the pipeline's routing and stress conditions. For the fourth condensate main pipe, a fixed support should be installed every 3-5 meters to prevent axial and radial displacement. At stress concentration points such as pipe bends and near valves, spring supports or hangers should be added to absorb displacement caused by thermal expansion and contraction, reducing the stress impact of the pipeline on equipment and supporting structures. The supports and hangers should be made of steel compatible with the pipeline material and undergo anti-corrosion treatment, such as applying rust-proof paint and anti-corrosion coatings, to extend their service life.

[0044] Pipeline Accessory Installation: Install necessary pipeline accessories on the fourth condensate header, including shut-off valves, check valves, flow measurement devices, and pressure measurement devices. Shut-off valves control the flow of the pipeline, facilitating inspection and maintenance. Check valves are installed near the fifth-phase deaerator to prevent condensate backflow. Flow measurement devices utilize electromagnetic flowmeters, characterized by high accuracy and stability, enabling real-time and accurate measurement of condensate flow within the pipeline. Pressure measurement devices employ high-precision pressure transmitters, converting pressure signals into electrical signals and transmitting them to the control system for real-time monitoring of pipeline pressure.

[0045] Condensate Piping Optimization: The second condensate header was inspected and optimized. Debris and rust inside the pipes were cleaned to ensure a smooth inner wall and reduce flow resistance. Unreasonable bends and diameter changes were modified by using large-radius bends and gradually decreasing diameter fittings to reduce local flow resistance. Simultaneously, the pipe insulation was inspected and repaired, using high-efficiency insulation materials such as rock wool or polyurethane foam to reduce heat loss during condensate transport. System Commissioning and Optimization: After adjusting the operating parameters of the condensate pumps in the second heating system and optimizing the second condensate header, the condensate system underwent overall commissioning. First, a no-load test run was conducted to check the operation of the condensate pumps, including whether parameters such as pump vibration, noise, and current were normal. Then, the load was gradually increased to simulate single-turbine operation and parallel operation of two turbines, monitoring changes in condensate flow and pressure. Based on the monitoring results, the operating parameters of the condensate pump and the opening of the pipeline valves were further fine-tuned to ensure that the system can stably and efficiently deliver condensate to the fifth-phase deaerator.

[0046] In summary, this utility model has the following advantages: 1) Significant energy saving and consumption reduction: By effectively recovering the condensate generated by the No. 2 and No. 3 steam turbines in the second thermal system and transporting it to the fourth deaerator, the waste of condensate is avoided, the efficient use of water resources and heat energy is realized, the enterprise's dependence on external water resources and energy is reduced, energy consumption is greatly reduced, and production and operating costs are lowered.

[0047] 2) Improved system reliability: The construction of pipelines and the setting of flow control components, pressure monitoring and regulation systems have made the condensate system more adaptable and stable; it can effectively cope with the demand changes under different operating conditions of each unit, adjust the flow and pressure of condensate in real time, ensure that the system always operates safely, stably and reliably, reduce the probability of equipment failure, and reduce equipment maintenance costs.

[0048] 3) Optimized Operational Efficiency: Targeted optimization of condensate in the second heating system and coordinated transformation of the entire condensate circulation system broke the limitations of the original relatively independent condensate systems in each phase, realizing interconnection and flexible allocation of condensate among multiple units. This improved the efficiency of condensate delivery and utilization, and optimized the heating system.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-unit condensate circulation system, characterized in that, This system is used to circulate condensate generated by multiple thermal systems; the thermal systems include a first thermal system, a second thermal system, a third thermal system, and a fourth thermal system; wherein, the first to third thermal systems each include a boiler, a steam turbine, a condenser, and a condensate pump connected in sequence; the fourth thermal system includes a boiler; the boiler of the fourth thermal system is connected to the steam turbines of the first and second thermal systems; The multi-unit condensate circulation system includes: The first deaerator has its inlet connected to the condensate pump of the first thermal system via the first condensate header, and its outlet connected to the boiler of the first thermal system. The second deaerator has its inlet connected to the condensate pump of the second thermal system via the second condensate header, and its outlet connected to the boiler of the second thermal system. The third deaerator has its inlet connected to the condensate pump of the third thermal system via the third condensate header, and its outlet connected to the boiler of the third thermal system. The fourth deaerator has its inlet connected to the first to third condensate headers via the fourth condensate header, and its outlet connected to the boiler of the fourth thermal system.

2. The multi-unit condensate circulation system according to claim 1, characterized in that, A shut-off valve is provided on both sides of the condensate pump connection of the first to third condensate headers and the corresponding first to third thermal systems; a shut-off valve is provided on the fourth condensate header and near the inlet of the fourth deaerator.

3. The multi-unit condensate circulation system according to claim 1, characterized in that, The boilers of the first thermal system include three 130T / H circulating fluidized bed boilers, the boilers of the second thermal system include three 220T / H circulating fluidized bed boilers, the boilers of the third thermal system include one 480T / H pulverized coal boiler, and the boilers of the fourth thermal system include one 480T / H pulverized coal boiler.

4. The multi-unit condensate circulation system according to claim 3, characterized in that, The first thermal system has one steam turbine, the second thermal system has two steam turbines, and the third thermal system has one steam turbine.

5. The multi-unit condensate circulation system according to claim 4, characterized in that, The condensate pump of the second thermal system is a pump with adjustable operating parameters.

6. The multi-unit condensate circulation system according to claim 1, characterized in that, A flow regulating valve is provided on the inlet pipe of the fourth deaerator and / or the outlet pipe of the condensate pump of the second thermal system.

7. The multi-unit condensate circulation system according to claim 6, characterized in that, The flow regulating valve is specifically a first electric regulating valve based on PID control.

8. The multi-unit condensate circulation system according to claim 1, characterized in that, The fourth condensate header is equipped with a first pressure monitoring and regulating device, and the second condensate header is equipped with a second pressure monitoring and regulating device.

9. The multi-unit condensate circulation system according to claim 8, characterized in that, The first pressure monitoring and regulation device includes a first pressure transmitter installed on the fourth condensate header, a second pressure transmitter installed on the inlet pipe of the fourth deaerator, and a self-regulating pressure regulating valve installed on the fourth condensate header; the second pressure monitoring and regulation device includes a third pressure transmitter installed on the second condensate header and a second electric regulating valve.

10. The multi-unit condensate circulation system according to claim 1, characterized in that, Also includes: The fifth deaerator has its inlet connected to the first condensate header and its outlet connected to an external chemical plant.

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