Negative pressure drainage sampling system for heater of heat supply network
By designing the negative pressure hydrophobic sampling system of the heat grid heater, connecting the steam-side water discharge pipes of the two heat grid heaters and leading out of the main pipe, the problem of inability to monitor the water quality online at the beginning and end of heating is solved, and the hydrophobic monitoring and sampling is achieved throughout the whole period to ensure the safe and stable operation of the system.
Patent Information
- Application Number
- CN202421740397.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-23
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-07-23
AI Technical Summary
The prior art cannot conduct online monitoring of hydrophobic water at the beginning and end of heating of the heat grid heater, and cannot perform manual testing under negative pressure, resulting in the inability to accurately judge the quality of hydrophobic water, affecting the operation of the system.
A negative pressure water drain sampling system for heat grid heaters was designed. By connecting the steam-side water drain pipes of two heat grid heaters, the main pipe is led out and divided into two channels into the booster pump. Manual valves are provided with the inlet and outlet of the booster pump to ensure that the water drain sampling and monitoring can be performed at any time.
Reliable monitoring of the hydrophobicity of the thermal network at any stage of heating is achieved, especially in the early and late stages of heating, to prevent overload operation of the condensate treatment system and equipment corrosion caused by poor water quality.
Smart Images
Figure CN223021615U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of sampling systems, and particularly relates to a negative-pressure drain sampling system for a heat network heater. Background Art
[0002] There are 4 heat network heaters in total for two steam turbine generator sets. Since the drains of the heat network heaters are all recycled, the water quality of the heat network drains is crucial. The existing on-line monitoring system for the water quality of the heat network drains has a sampling point at the outlet of the heat network drain pump, which results in that only accurate sampling of the heat network drains can be carried out during the mid-term of heating, and on-line monitoring of the heat network drains cannot be carried out at the beginning and end of heating. At the same time, since both the inside of the heat network heater and the heat network drain are in a negative-pressure state at this time, it is also impossible to sample by means of manual water quality detection. Especially when the heat network system is just put into operation, the heat network drains are discharged through the emergency drain. Since the water quality of the heat network drains cannot be monitored, the operating personnel cannot drain the water to the condenser at the accurate time. Content of the Utility Model
[0003] The utility model aims at the above problems and provides a negative-pressure drain sampling system for a heat network heater that is convenient for sampling at all times.
[0004] To achieve the above object, the utility model adopts the following technical scheme. The utility model includes a first heat network heater 25 and a second heat network heater 26, and is characterized in that the steam-side drain outlet of the first heat network heater 25 is respectively connected to the inlet of a first steam-side drain valve 1 and the inlet of a first drain sampling valve 4. The outlet of the first drain sampling valve 4 is respectively connected to the inlet of a main pipe 15 and the outlet of a second drain sampling valve 5. The inlet of the second drain sampling valve 5 is respectively connected to the inlet of a second steam-side drain valve 2 and the steam-side drain outlet of the second heat network heater 26.
[0005] The outlet of the main pipe 15 is respectively connected to the inlet of a first booster pump inlet valve 6 and the inlet of a second booster pump inlet valve 10. The outlet of the first booster pump inlet valve 6 is connected to the inlet of a first booster pump 7. The outlet of the first booster pump 7 is connected to the inlet of a first check valve 8. The outlet of the first check valve 8 is connected to the inlet of a first booster pump outlet valve 9.
[0006] The outlet of the second booster pump inlet valve 10 is connected to the inlet of a second booster pump 11. The outlet of the second booster pump 11 is connected to the inlet of a second check valve 12. The outlet of the second check valve 12 is connected to the inlet of a second booster pump outlet valve 13.
[0007] The outlet of the second booster pump outlet valve 13 is respectively connected to the outlet of the first booster pump outlet valve 9, the outlet of an anti-backflow check valve 14, and the sampling port of a drain sampling device.
[0008] As a preferred solution, the first hydrophobic sampling valve 4, the second hydrophobic sampling valve 5, the first booster pump inlet valve 6, the second booster pump inlet valve 10, the first booster pump outlet valve 9 and the second booster pump outlet valve 13 of the present utility model are all manual valves.
[0009] As another preferred solution, the water inlets of the first heat network heater 25 and the second heat network heater 26 of the present utility model are connected to the heat network circulating water supply pipe, and the water outlets of the first heat network heater 25 and the second heat network heater 26 are connected to the heat network circulating water return pipe.
[0010] Secondly, the first booster pump 7 of the present utility model is interlocked with the second booster pump 11.
[0011] In addition, the hydrophobic outlets of the first heat network heater 25 and the second heat network heater 26 of the present utility model are respectively connected to the inlets of the first electric valve 16 to the condenser, the inlet of the first drain pump 19, and the inlet of the second drain pump 20. The outlet of the first electric valve 16 is connected to the inlet of the pneumatic valve 17, the outlet of the pneumatic valve 17 is connected to the inlet of the second electric valve 18, and the outlet of the second electric valve 18 is connected to the pipe to the condenser;
[0012] The outlet of the first drain pump 19 is respectively connected to the outlet of the second drain pump 20, the inlet of the sampling valve 3, the inlet of the cooler inlet electric valve 22, and the inlet of the cooler bypass electric valve 21. The outlet of the cooler inlet electric valve 22 is connected to the cooling inlet of the heat network drain cooler 23, the cooling outlet of the heat network drain cooler 23 is connected to the inlet of the cooler outlet electric valve 24, and the outlet of the cooler outlet electric valve 24 is respectively connected to the outlet of the cooler bypass electric valve 21 and the pipe to the condensate pump; The condensate inlet of the heat network drain cooler 23 is connected to the self-condensate pipeline, and the condensate outlet of the heat network drain cooler 23 is connected to the pipeline to the condensate.
[0013] Advantages of the present utility model.
[0014] The present utility model connects the steam side drain pipes of two heat network heaters (25, 26), leads out a main pipe 15 on the connecting pipe, and this main pipe 15 is then divided into two paths and enters two heat network drain sampling booster pumps (7, 11) respectively. Inlets of the two booster pumps (7, 11) are respectively provided with inlet valves (6, 10), outlets are respectively provided with check valves (8, 12) and outlet valves (9, 13), and the two booster pumps (7, 11) are in a one-use-one-backup mode.
[0015] By setting the inlet valves (6, 10) and the outlet valves (9, 13), it is convenient to isolate and repair the booster pumps (7, 11) when the booster pumps (7, 11) fail.
[0016] After the hot water network drain water is boosted by the booster pumps (7, 11) and then discharged to the outlet sampling valve 3 of the hot water network drain pump (19, 20), a water backflow prevention check valve 14 is installed after the outlet sampling valve 3 of the hot water network drain pump (19, 20). In this way, at the initial and final stages of heating, the drain water of the hot water network heater is directly sampled and sent to the water quality detection device through the solution provided by the present utility model. In the middle stage of heating, the hot water network drain water is sampled from the outlet of the hot water network drain pump (19, 20) and sent to the water quality detection device.
[0017] The hot water network heater drain water sampling system provided by the present utility model enables the operating personnel to conveniently judge whether the quality of the hot water network drain water meets the requirements for discharging into the steam-water system after the hot water network system is put into operation. If the water quality exceeds the standard, the valve control can also be used to determine which hot water network heater has exceeded the standard in drain water quality, preventing the poor quality of the hot water network drain water from causing poor quality of the condensate water and overloading the condensate water polishing system, and preventing serious corrosion of the main equipment such as boilers and steam turbines due to poor water quality. Brief Description of the Drawings
[0018] The following further describes the present utility model in conjunction with the drawings and specific embodiments. The protection scope of the present utility model is not limited to the description of the following content.
[0019] Figure 1 It is a schematic structural diagram of the present utility model.
[0020] In the figure, 1 is the first steam side drain valve, 2 is the second steam side drain valve, 3 is the outlet sampling valve of the hot water network drain pump, 4 is the first drain water sampling valve, 5 is the second drain water sampling valve, 6 is the inlet valve of the first booster pump, 7 is the first booster pump, 8 is the first check valve, 9 is the outlet valve of the first booster pump, 10 is the inlet valve of the second booster pump, 11 is the second booster pump, 12 is the second check valve, 13 is the outlet valve of the second booster pump, 14 is the water backflow prevention check valve, 15 is the main pipe, 16 is the first electric valve, 17 is the pneumatic valve, 18 is the second electric valve, 19 is the first drain pump, 20 is the second drain pump, 21 is the cooler bypass electric valve, 22 is the cooler inlet electric valve, 23 is the hot water network drain water cooler, 24 is the cooler outlet electric valve, 25 is the first hot water network heater, and 26 is the second hot water network heater. Detailed Embodiments
[0021] As shown in the figure, the present utility model includes a first hot water network heater 25 and a second hot water network heater 26. The steam side drain openings of the first hot water network heater 25 are respectively connected to the inlet of the first steam side drain valve 1 and the inlet of the first drain water sampling valve 4. The outlet of the first drain water sampling valve 4 is respectively connected to the inlet of the main pipe 15 and the outlet of the second drain water sampling valve 5. The inlet of the second drain water sampling valve 5 is respectively connected to the inlet of the second steam side drain valve 2 and the steam side drain opening of the second hot water network heater 26;
[0022] The outlet of the mother pipe 15 is respectively connected to the inlet of the first booster pump inlet valve 6 and the inlet of the second booster pump inlet valve 10, the outlet of the first booster pump inlet valve 6 is connected to the inlet of the first booster pump 7, the outlet of the first booster pump 7 is connected to the inlet of the first check valve 8, and the outlet of the first check valve 8 is connected to the inlet of the first booster pump outlet valve 9;
[0023] The outlet of the second boost pump inlet valve 10 is connected to the inlet of the second boost pump 11, the outlet of the second boost pump 11 is connected to the inlet of the second check valve 12, and the outlet of the second check valve 12 is connected to the inlet of the second boost pump outlet valve 13;
[0024] The outlet of the second booster pump outlet valve 13 is respectively connected to the outlet of the first booster pump outlet valve 9, the outlet of the anti-backflow check valve 14, and the sampling port of the hydrophobic sampling device.
[0025] Two heat network heaters (25, 26) are correspondingly arranged for each steam turbine generator set to meet the demand for external heat supply.
[0026] The first booster pump 7 is interlocked with the second booster pump 11. Once a booster pump fails and trips during operation, the other booster pump is quickly started, and the inlet and outlet manual valves of the two booster pumps are kept in a normally open state to ensure that the standby pump is reliable.
[0027] The first drain sampling valve 4, the second drain sampling valve 5, the first booster pump inlet valve 6, the second booster pump inlet valve 10, the first booster pump outlet valve 9 and the second booster pump outlet valve 13 are all manual valves. The manual valves are convenient for operators to operate and save project costs.
[0028] The water inlets of the first heating network heater 25 and the second heating network heater 26 are connected to the heating network circulating water inlet pipe, the water outlets of the first heating network heater 25 and the second heating network heater 26 are connected to the heating network circulating water return pipe, and the steam extraction ports of the first heating network heater 25 and the second heating network heater 26 are connected to the five-stage steam extraction pipe of the steam turbine.
[0029] The drain outlets of the first heat network heater 25 and the second heat network heater 26 are respectively connected to the inlets of the first electric valve 16 to the condenser, the inlet of the first drain pump 19, and the inlet of the second drain pump 20. The outlet of the first electric valve 16 is connected to the inlet of the pneumatic valve 17. The outlet of the pneumatic valve 17 is connected to the inlet of the second electric valve 18. The outlet of the second electric valve 18 is connected to the pipe to the condenser; the outlet of the first drain pump 19 is respectively connected to the outlet of the second drain pump 20, the inlet of the sampling valve 3, the inlet of the cooler inlet electric valve 22, and the inlet of the cooler bypass electric valve 21. The outlet of the cooler inlet electric valve 22 is connected to the cooling inlet of the heat network drain cooler 23. The cooling outlet of the heat network drain cooler 23 is connected to the inlet of the cooler outlet electric valve 24. The outlet of the cooler outlet electric valve 24 is respectively connected to the outlet of the cooler bypass electric valve 21 and the pipe to the condensate pump; the condensate inlet of the heat network drain cooler 23 is connected to the self-condensate pipeline, and the condensate outlet of the heat network drain cooler 23 is connected to the pipeline to the condensate pipeline. Two drain pumps (19, 20) are provided, one main and one standby.
[0030] The pneumatic valve 17 is used to control the drainage volume of the heat network heater drain to the condenser to ensure that the liquid level of the heat network heater is within the normal range. When the pneumatic valve 17 fails, the pneumatic valve 17 is isolated for maintenance through the first electric valve 16 and the second electric valve 18.
[0031] The cooler inlet electric valve 22 and the cooler outlet electric valve 24 are used to isolate the heat network drain cooler 23 for maintenance after the heat network drain cooler 23 fails. At this time, the heat network drain is discharged to the outlet of the condensate pump through the cooler bypass electric valve 21.
[0032] The drain discharge of the heat network heaters (25, 26) is divided into two paths. One path enters the condenser after passing through the first electric valve 16, the pneumatic valve 17, and the second electric valve 18; the other path is pressurized by the heat network drain pumps (19, 20) and discharged to the condensate pipeline after heating the condensate in the heat network drain cooler 23. In the initial and final stages of heating, when the heat network drain volume is small, the heat network drain is discharged to the condenser. In the middle stage of heating, when the heat network drain volume is large, the heat network drain is discharged to the condensate pipeline.
[0033] When the structure of the utility model is specifically implemented, a tee can be welded in front of the first steam-side drain valve 1 and the second steam-side drain valve 2 to connect the steam-side drain pipes of the two heat network heaters, and the first drain sampling valve 4 and the second drain sampling valve 5 are arranged on the connecting pipe respectively. A mother pipe 15 is led out between the first drain sampling valve 4 and the second drain sampling valve 5, and the mother pipe 15 is further divided into two routes, and the first booster pump 7 and the second booster pump 11 are arranged on each route respectively, and the first booster pump 7 and the second booster pump 11 are used and reserved. The two routes pass through the manual valve after the booster pump outlet check valve and merge into one route, and are connected to the outlet sampling valve 3 of the heat network drain pump, and a backflow prevention check valve 14 is installed after the outlet sampling valve 3 of the heat network drain pump to prevent the sampling system from returning water to the drain system.
[0034] After the implementation of the utility model, it can ensure that the heat network drain can be reliably monitored at any stage of the heating period, especially at the beginning of the heating period, it helps the operating personnel to judge the time for the heat network drain to be switched from the external discharge to the condenser, and prevents the poor quality of steam and water in the thermal system.
[0035] It can be understood that the above specific description of the utility model is only used to illustrate the utility model and is not limited to the technical solution described in the embodiments of the utility model. Ordinary technicians in the field should understand that the utility model can still be modified or replaced by equivalents to achieve the same technical effect; as long as the use requirements are met, they are within the protection scope of the utility model.
Claims
1. A negative pressure hydrophobic sampling system for a heating network heater, comprising a first heating network heater (25) and a second heating network heater (26), characterized in that The steam-side drain port of the first heating network heater (25) is respectively connected to the inlet of the first steam-side drain valve (1) and the inlet of the first drain sampling valve (4); the outlet of the first drain sampling valve (4) is respectively connected to the inlet of the main pipe (15) and the outlet of the second drain sampling valve (5); the inlet of the second drain sampling valve (5) is respectively connected to the inlet of the second steam-side drain valve (2) and the steam-side drain port of the second heating network heater (26); The outlet of the main pipe (15) is respectively connected to the inlet of the first boosting pump inlet valve (6) and the inlet of the second boosting pump inlet valve (10); the outlet of the first boosting pump inlet valve (6) is connected to the inlet of the first boosting pump (7); the outlet of the first boosting pump (7) is connected to the inlet of the first check valve (8); and the outlet of the first check valve (8) is connected to the inlet of the first boosting pump outlet valve (9); The outlet of the second boosting pump inlet valve (10) is connected to the inlet of the second boosting pump (11), the outlet of the second boosting pump (11) is connected to the inlet of the second check valve (12), and the outlet of the second check valve (12) is connected to the inlet of the second boosting pump outlet valve (13); The outlet of the second booster pump outlet valve (13) is respectively connected to the outlet of the first booster pump outlet valve (9), the outlet of the anti-backflow check valve (14), and the sampling port of the drain sampling device.
2. According to claim 1, a negative pressure hydrophobic sampling system for a heating network heater is characterized in that The first hydrophobic sampling valve (4), the second hydrophobic sampling valve (5), the first booster pump inlet valve (6), the second booster pump inlet valve (10), the first booster pump outlet valve (9) and the second booster pump outlet valve (13) are all manual valves.
3. According to claim 1, a negative pressure hydrophobic sampling system for a heating network heater is characterized in that The water inlets of the first heating network heater (25) and the second heating network heater (26) are connected to the heating network circulating water supply pipe, and the water outlets of the first heating network heater (25) and the second heating network heater (26) are connected to the heating network circulating water return pipe.
4. According to claim 1, a negative pressure hydrophobic sampling system for a heating network heater is characterized in that The first boosting pump (7) is interlocked with the second boosting pump (11).