System for reliably isolating high-pressure heater
By adding an electric isolation door to the high-pressure heater system, the problem of inconvenient maintenance after a high-pressure heater leak was solved, and the safety, reliability and economy of high-pressure heater maintenance were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG HONGQIAO NEW MATERIAL CO LTD
- Filing Date
- 2025-03-04
- Publication Date
- 2026-04-10
AI Technical Summary
High-pressure heaters are susceptible to large load fluctuations after the unit's deep peak shaving and the AGC system are put into operation, which can lead to stress fracture and leakage, and incomplete closure of inlet and outlet water valves, affecting the unit's economy and safety.
First and second electrically operated isolation valves are added to the high-pressure heater system and connected to the three-way valve and the outlet electrically operated isolation valve through pipelines to form a reliable isolation system, ensuring the safety and reliability of the high-pressure heater during maintenance.
It has improved the safety and reliability of high-pressure heater maintenance, shortened maintenance time, reduced unit downtime, and enhanced economy and personnel safety.
Smart Images
Figure CN224108180U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model discloses a high pressure feed water system technical field, and concretely relates to a system of reliable isolation high pressure heater. BACKGROUND
[0002] As the important heat exchange equipment of the heat recovery system of the unit of the thermal power plant, the high pressure heater is long-term influenced by factors such as unit deep peak shaving, unit load fluctuation after AGC system is put into operation, and is easy to cause stress fracture leakage of high pressure heater tube bundle, and after high pressure heater leaks, on-line disconnection is needed to carry out leakage detection, because the high pressure feed water system is designed as water inlet three-way valve, water outlet gate valve and large bypass system, the problem of inlet and outlet water door closing not tightly often occurs, and the unit needs to be stopped to carry out leakage detection, which influences unit economy.
[0003] Therefore, the person skilled in the art needs to find a new technical solution to solve the above problems. UTILITY MODEL CONTENT
[0004] In order to overcome the problems in the related art, the utility model discloses a system of reliable isolation high pressure heater, which comprises a feed water pump, a first high pressure heater, a second high pressure heater, a third high pressure heater, a three-way valve, a first electric isolation door, a second electric isolation door and a water outlet electric isolation door.
[0005] The first interface of the three-way valve is communicated with the feed water pump through a pipeline, the second interface of the three-way valve is communicated with the water inlet of the boiler side high pressure feed water pipeline through a pipeline, and the third interface of the three-way valve is sequentially communicated with the water inlet of the first high pressure heater, the water outlet of the first high pressure heater, the water inlet of the second high pressure heater, the water outlet of the second high pressure heater, the water inlet of the third high pressure heater, the water outlet of the third high pressure heater, the first interface of the water outlet electric isolation door, the second interface of the water outlet electric isolation door and the water inlet of the boiler side high pressure feed water pipeline through pipelines in sequence.
[0006] The first interface of the first electric isolation door is communicated with the third interface of the three-way valve through a pipeline, and the second interface of the first electric isolation door is communicated with the water inlet of the first high pressure heater through a pipeline.
[0007] The first interface of the second electric isolation door is communicated with the second interface of the water outlet electric isolation door through a pipeline, and the second interface of the second electric isolation door is communicated with the water inlet of the boiler side high pressure feed water pipeline through a pipeline.
[0008] Optionally, the pipe diameter of the first electric isolation door is same with the pipe diameter of the three-way valve, and the pipe diameter of the second electric isolation door is same with the pipe diameter of the water outlet electric isolation door.
[0009] Optionally, the installation direction of the first electric isolation door and the second electric isolation door is horizontal installation.
[0010] Optionally, the system for reliably isolating high-pressure heaters further comprises a drain pipe, a first high-pressure manual valve and a second high-pressure manual valve.
[0011] One end of the drain pipe is in communication with the third interface of the three-way valve, the first interface of the first electric isolation door and the first interface of the first high-pressure manual valve, respectively.
[0012] The first interface of the first high-pressure manual valve, the second interface of the first high-pressure manual valve, the first interface of the second high-pressure manual valve and the second interface of the second high-pressure manual valve are connected in series through the drain pipe.
[0013] Optionally, the system for reliably isolating high-pressure heaters further comprises a first electric isolation door operation button, a second electric isolation door operation button and a DCS control device.
[0014] The first electric isolation door operation button is electrically connected with the first electric isolation door through the DCS control device, and the second electric isolation door operation button is electrically connected with the second electric isolation door through the DCS control device.
[0015] Optionally, the system for reliably isolating high-pressure heaters further comprises a first drain pipe and a first drain funnel.
[0016] The first end of the first drain pipe is in communication with the second interface of the first electric isolation door and the water inlet of the first high-pressure heater, respectively, and the second end of the first drain pipe is in communication with the first drain funnel.
[0017] Optionally, the system for reliably isolating high-pressure heaters further comprises a second drain pipe and a second drain funnel.
[0018] The first end of the second drain pipe is in communication with the water outlet of the first high-pressure heater and the water inlet of the second high-pressure heater, respectively, and the second end of the second drain pipe is in communication with the second drain funnel.
[0019] Optionally, the system for reliably isolating high-pressure heaters further comprises a third drain pipe and a third drain funnel.
[0020] The first end of the third drain pipe is in communication with the water outlet of the second high-pressure heater and the water inlet of the third high-pressure heater, respectively, and the second end of the third drain pipe is in communication with the third drain funnel.
[0021] Optionally, the system for reliably isolating high-pressure heaters further comprises a fourth drain funnel.
[0022] The fourth drainage funnel is connected with the first high-pressure manual valve and the second high-pressure manual valve through the drain pipe.
[0023] Optionally, the system for reliably isolating the high-pressure heater further comprises a spring safety valve, a fifth drain pipe and a fifth drainage funnel.
[0024] The first end of the fifth drain pipe is in communication with the third interface of the three-way valve and the first end of the drain pipe, the second end of the fifth drain pipe is in communication with the fifth drainage funnel, and the spring safety valve is arranged on the fifth drain pipe and in communication with the fifth drain pipe.
[0025] In summary, the utility model relates to high pressure water supply system technical field, specifically, it is a kind of system for reliably isolating the high-pressure heater, including: water supply pump, three high-pressure heaters, three-way valve, two electric isolation doors and water outlet electric isolation door;Three-way valve first interface is in communication with water supply pump, second interface is in communication with water supply pipeline, third interface is connected with the water inlet and outlet of first high-pressure heater, the water inlet and outlet of second high-pressure heater, the water inlet and outlet of third high-pressure heater, water outlet electric isolation door, the water inlet of boiler side high-pressure water supply pipeline;The two ends of first electric isolation door are in communication with the third interface of three-way valve and the water inlet of first high-pressure heater respectively;The two ends of second electric isolation door are in communication with the second interface of water outlet electric isolation door and water supply pipeline respectively.It can improve the safety reliability of high-pressure heater on-line maintenance by adding isolation door, avoids the problem that valve internal leakage high-pressure heater cannot be on-line maintenance.
[0026] Other features and advantages of the utility model will be described in detail in the following specific embodiment part. BRIEF DESCRIPTION OF DRAWINGS
[0027] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification illustrating the present disclosure and together with the specific embodiments described below, serve to explain the present disclosure but do not constitute a limitation on the present disclosure. In the drawings:
[0028] Figure 1 is a schematic diagram of a system for reliably isolating a high-pressure heater according to an exemplary embodiment. DETAILED DESCRIPTION
[0029] The specific embodiments of the utility model disclosed herein will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.
[0030] Figure 1 is a schematic diagram of a system for reliably isolating a high-pressure heater according to an exemplary embodiment, as Figure 1As shown, the system of the reliable isolation high-pressure heater includes a feed water pump 110, a first high-pressure heater 120, a second high-pressure heater 130, a third high-pressure heater 140, a three-way valve 150, a first electric isolation door 160, a second electric isolation door 170, and a water outlet electric isolation door 180; a first interface of the three-way valve 150 is communicated with the feed water pump 110 through a pipeline, a second interface of the three-way valve 150 is communicated with a water inlet of a boiler-side high-pressure feed water pipeline 190 through a pipeline, and a third interface of the three-way valve 150 is communicated with a water inlet of the first high-pressure heater 120, a water outlet of the first high-pressure heater 120, a water inlet of the second high-pressure heater 130, a water outlet of the second high-pressure heater 130, a water inlet of the third high-pressure heater 140, a water outlet of the third high-pressure heater 140, a first interface of the water outlet electric isolation door 180, a second interface of the water outlet electric isolation door 180, and the water inlet of the boiler-side high-pressure feed water pipeline 190 in sequence; a first interface of the first electric isolation door 160 is communicated with the third interface of the three-way valve 150 through a pipeline, and a second interface of the first electric isolation door 160 is communicated with the water inlet of the first high-pressure heater 120 through a pipeline; a first interface of the second electric isolation door 170 is communicated with the second interface of the water outlet electric isolation door 180 through a pipeline, and a second interface of the second electric isolation door 170 is communicated with the water inlet of the boiler-side high-pressure feed water pipeline 190 through a pipeline.
[0031] In the embodiment, the pipe diameter of the first electric isolation door 160 is the same as that of the three-way valve 150, and the pipe diameter of the second electric isolation door 170 is the same as that of the water outlet electric isolation door 180.
[0032] For example, in order to effectively cope with and solve the problems of the high-pressure heating system of a 330MW subcritical unit participating in deep load regulation, large load fluctuation of AGC input, and high load and variable working condition causing high-pressure heater leakage after shock, the embodiment of the utility model discloses a three-way valve isolation electric door (i.e., the first electric isolation door) and a high-pressure feed water outlet electric door isolation electric door (i.e., the second electric isolation door) are added to the original feed water pipeline system after the high-pressure heater inlet, so that the electric isolation door can reliably isolate the high-pressure heater for maintenance, the newly added electric isolation door can be closed without operation, the original system valve internal leakage or the isolation reliability of the high-pressure heater maintenance system is improved, and the newly added isolation electric door needs to be closed to prevent personal safety during maintenance, thereby avoiding the problem of forced unit shutdown due to valve internal leakage. The isolation door has no influence on the original system resistance, can improve the safety and reliability of the online maintenance of the high-pressure heater, and avoids the problem of online maintenance of the high-pressure heater due to valve internal leakage.
[0033] After the first electric isolation door and the second electric isolation door are installed, the pressure relief speed of the safety measure during normal maintenance of the high-pressure heater is obviously accelerated, the single maintenance time is reduced from about 75 hours to about 48 hours, 10-12 hours of work time is reduced during one high-pressure heater maintenance, the economy of the unit is improved, and the effect is remarkable in the safety of the on-line maintenance personnel of the high-pressure heater and the economy of the unit.
[0034] Further, the installation direction of the first electric isolation door 160 and the second electric isolation door 170 is horizontal installation.
[0035] For example, the valve position installation direction of the first electric isolation door and the second electric isolation door is horizontal installation, which can prevent the problems of valve core falling off and feed water interruption during vertical installation operation.
[0036] The system for reliably isolating the high-pressure heater further comprises a drain pipe 210, a first high-pressure manual valve 220 and a second high-pressure manual valve 230; one end of the drain pipe 210 is in communication with the third interface of the three-way valve 150, the first interface of the first electric isolation door 160 and the first interface of the first high-pressure manual valve 220 respectively; the first interface of the first high-pressure manual valve 220, the second interface of the first high-pressure manual valve 220, the first interface of the second high-pressure manual valve 230 and the second interface of the second high-pressure manual valve 230 are sequentially connected in series through the drain pipe 210.
[0037] For example, in order to test the tightness of the high-pressure heater inlet three-way valve after being closed, the utility model discloses that a drain pipe with a pipe diameter of 25 and two high-pressure manual valves (i.e., the first high-pressure manual valve and the second high-pressure manual valve) are added between the high-pressure heater inlet three-way valve and the first electric isolation door newly added behind the three-way valve, whether the high-pressure heater inlet three-way valve is tight is judged by checking whether steam and water flow out of the drain valve and the size after the high-pressure heater is tripped, and corresponding maintenance and treatment are carried out in combination with subsequent unit maintenance conditions.
[0038] The system for reliably isolating the high-pressure heater further comprises a first electric isolation door operation button, a second electric isolation door operation button and a DCS control device (not shown in the figure); the first electric isolation door operation button is electrically connected with the first electric isolation door 160 through the DCS control device, and the second electric isolation door operation button is electrically connected with the second electric isolation door 170 through the DCS control device.
[0039] Exemplarily, two electric isolation door operation buttons (i.e., a first electric isolation door operation button and a second electric isolation door operation button) are installed by using the disk cabinet standby interface, and the electric isolation door operation buttons are connected to the DCS control device, so as to realize remote control of the electric isolation door, to prevent the electric isolation door from being mistakenly closed in the operation of the high-pressure heater system, and to prevent the problem of water supply interruption. The two newly added high-pressure water supply electric doors do not participate in the protection logic, and the valve action requirements and sequence of the high-pressure heater water level protection logic remain unchanged. In the normal operation of the high-pressure heater system, the electric isolation door is in a normal open and power-off state.
[0040] In addition, as Figure 1 shown, the system for reliably isolating the high-pressure heater further includes a first drain pipe 310 and a first drain funnel 320; a first end of the first drain pipe 310 is in communication with a second interface of the first electric isolation door 160 and a water inlet of the first high-pressure heater 120, respectively, and a second end of the first drain pipe 310 is in communication with the first drain funnel 320.
[0041] A second drain pipe 410 and a second drain funnel 420; a first end of the second drain pipe 410 is in communication with a water outlet of the first high-pressure heater 120 and a water inlet of the second high-pressure heater 130, respectively, and a second end of the second drain pipe 410 is in communication with the second drain funnel 420.
[0042] A third drain pipe 510 and a third drain funnel 520; a first end of the third drain pipe 510 is in communication with a water outlet of the second high-pressure heater 130 and a water inlet of the third high-pressure heater 140, respectively, and a second end of the third drain pipe 510 is in communication with the third drain funnel 520.
[0043] A fourth drain funnel 620; the fourth drain funnel 620 is connected in series with the first high-pressure manual valve 220 and the second high-pressure manual valve 230 through the drain pipe 210.
[0044] A spring safety valve 710, a fifth drain pipe 720, and a fifth drain funnel 730; a first end of the fifth drain pipe 720 is in communication with a third interface of the three-way valve 150 and a first end of the drain pipe 210, respectively, a second end of the fifth drain pipe 720 is in communication with the fifth drain funnel 730, and the spring safety valve 710 is arranged on the fifth drain pipe 720 and in communication with the fifth drain pipe 720.
[0045] In conclusion, the utility model relates to the technical field of high pressure feedwater system, specifically, relate to a system of reliable isolation high pressure heater, include: feedwater pump, three high pressure heaters, three -way valve, two electric isolation doors and water outlet electric isolation door, three -way valve first interface and feedwater pump intercommunication, second interface and feedwater pipeline intercommunication, third interface series first high pressure heater's water inlet and water outlet, second high pressure heater's water inlet and water outlet, third high pressure heater's water inlet and water outlet, water outlet electric isolation door, boiler side high pressure feedwater pipeline's water inlet, first electric isolation door both ends respectively with three -way valve's third interface intercommunication and first high pressure heater's water inlet intercommunication, second electric isolation door's both ends respectively with water outlet electric isolation door's second interface intercommunication and feedwater pipeline intercommunication, can pass through the installation isolation door, promotes the safety reliability of high -pressure heater on -line maintenance, avoided the problem that high -pressure heater cannot be overhauled on -line because of valve internal leakage.
[0046] The preferred embodiments of the present disclosure are described in detail above in combination with the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments, and various simple modifications can be made to the technical solutions of the present disclosure within the technical concept of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
[0047] In addition, it should be noted that various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the present disclosure will not further describe various possible combination manners.
[0048] Furthermore, various different embodiments of the present disclosure can also be combined in any appropriate manner, as long as they do not deviate from the idea of the present disclosure, and they should also be considered as disclosed by the present disclosure.
Claims
1. A system for reliably isolating a high pressure heater, the system comprising: The system of the reliable isolation high-pressure heater comprises a feed water pump, a first high-pressure heater, a second high-pressure heater, a third high-pressure heater, a three-way valve, a first electric isolation door, a second electric isolation door and a water outlet electric isolation door; A first interface of the three-way valve is communicated with the feed water pump through a pipeline, a second interface of the three-way valve is communicated with a water inlet of a high-pressure feed water pipeline of a boiler side through a pipeline, and a third interface of the three-way valve is sequentially communicated with a water inlet of the first high-pressure heater, a water outlet of the first high-pressure heater, a water inlet of the second high-pressure heater, a water outlet of the second high-pressure heater, a water inlet of the third high-pressure heater, a water outlet of the third high-pressure heater, a first interface of the water outlet electric isolation door, a second interface of the water outlet electric isolation door and the water inlet of the high-pressure feed water pipeline of the boiler side through pipelines in series. A first interface of the first electric isolation door is communicated with the third interface of the three-way valve through a pipeline, and a second interface of the first electric isolation door is communicated with the water inlet of the first high-pressure heater through a pipeline. A first interface of the second electric isolation door is communicated with the second interface of the water outlet electric isolation door through a pipeline, and a second interface of the second electric isolation door is communicated with the water inlet of the high-pressure feed water pipeline of the boiler side through a pipeline.
2. The system for reliably isolating a high pressure heater of claim 1, wherein, The pipe diameter of the first electric isolation door is the same as that of the three-way valve, and the pipe diameter of the second electric isolation door is the same as that of the water outlet electric isolation door.
3. The system for reliably isolating a high pressure heater of claim 1, wherein, The first electric isolation door and the second electric isolation door are horizontally installed.
4. The system for reliably isolating a high pressure heater of claim 1, wherein, The system of the reliable isolation high-pressure heater further comprises a blow-off pipe, a first high-pressure manual valve and a second high-pressure manual valve. One end of the blow-off pipe is communicated with the third interface of the three-way valve, the first interface of the first electric isolation door and the first interface of the first high-pressure manual valve respectively. The first interface of the first high-pressure manual valve, the second interface of the first high-pressure manual valve, the first interface of the second high-pressure manual valve and the second interface of the second high-pressure manual valve are sequentially connected through the blow-off pipe.
5. The system for reliably isolating a high pressure heater of claim 1, wherein, The system of the reliable isolation high-pressure heater further comprises a first electric isolation door operation button, a second electric isolation door operation button and a DCS control device. The first electric isolation door operation button is electrically connected with the first electric isolation door through the DCS control device, and the second electric isolation door operation button is electrically connected with the second electric isolation door through the DCS control device.
6. The system for reliably isolating a high pressure heater of claim 1, wherein, The system of the reliable isolation high-pressure heater further comprises a first drain pipe and a first drain funnel. A first end of the first drain pipe is communicated with the second interface of the first electric isolation door and the water inlet of the first high-pressure heater respectively, and a second end of the first drain pipe is communicated with the first drain funnel.
7. The system for reliably isolating a high pressure heater of claim 1, wherein, The system of the reliable isolation high-pressure heater further comprises a second drain pipe and a second drain funnel. A first end of the second drain pipe is communicated with the water outlet of the first high-pressure heater and the water inlet of the second high-pressure heater respectively, and a second end of the second drain pipe is communicated with the second drain funnel.
8. The system for reliably isolating a high pressure heater of claim 1, wherein, The system of the reliable isolation high-pressure heater further comprises a third drain pipe and a third drain funnel; The first end of the third drain pipe is in communication with the water outlet of the second high-pressure heater and the water inlet of the third high-pressure heater respectively, and the second end of the third drain pipe is in communication with the third drain funnel.
9. The system for reliably isolating a high pressure heater of claim 1, wherein, The system of the reliable isolation high-pressure heater further comprises a fourth drain funnel; The fourth drain funnel is in series with the first high-pressure manual valve and the second high-pressure manual valve through a drain pipe.
10. The system for reliably isolating a high pressure heater of claim 9, wherein, The system of the reliable isolation high-pressure heater further comprises a spring safety valve, a fifth drain pipe and a fifth drain funnel; The first end of the fifth drain pipe is in communication with the third interface of the three-way valve and the first end of the drain pipe respectively, the second end of the fifth drain pipe is in communication with the fifth drain funnel, and the spring safety valve is arranged on the fifth drain pipe and in communication with the fifth drain pipe.