Full-load operation high-pressure heater normal drainage system
By designing a normal high-pressure heater drainage system for full-load operation, the problem of poor drainage in thermal power generating units under low load was solved, realizing the recovery and utilization of heat from the high-pressure heater drainage, and improving the unit's operating economy and reliability.
Patent Information
- Application Number
- CN202423255047.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-28
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-28
AI Technical Summary
When thermal power generating units are under low load, the high-pressure heater condensate cannot flow smoothly through each stage, resulting in wasted heat from the condensate and affecting the unit's operating economy and reliability.
Design a high-pressure heater normal drainage system for full-load operation. By using a combination of valves and pumps, the high-pressure heater drainage is diverted to different equipment under different loads to achieve heat recovery and utilization. The drainage pipelines from the No. 1 high-pressure heater to the No. 2 high-pressure heater, the No. 2 high-pressure heater to the No. 3 high-pressure heater, and to the deaerator and flash tank are equipped with shut-off valves and regulating valves. The low-pressure heater drainage pump pressurizes the drainage and discharges it into the condensate pipeline.
Ensuring unobstructed drainage under full load, recovering heat from the high-pressure heater's drainage, reducing coal consumption for power generation, and improving operational economy and reliability.
Smart Images
Figure CN223636147U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of electric power system relates to a steam power plant high plus normal drainage system. BACKGROUND
[0002] With the increase of the demand of the thermal power generating unit deep peak regulation, the unit is long-term operated at low load. At low load, the pressure difference between the adjacent two stages of steam extraction is reduced, and this pressure difference is insufficient to overcome the resistance of the pipeline and equipment when the drainage flows by itself, causing poor drainage and affecting the normal operation of the unit. In order to maintain the normal water level of No. 3 high pressure heater, the conventional high pressure heater drainage system will open the emergency drainage at low load, and the drainage of No. 3 high pressure heater is discharged to the condenser, causing the waste of drainage heat. CONTENT OF THE UTILITY MODEL
[0003] The technical problem to be solved by the utility model is that, for the low load of the thermal power generating unit, the normal drainage of the high pressure heater flows by itself and is not smooth, and the high pressure heater drainage is discharged to the condenser, which wastes the heat. Therefore, the utility model provides a steam power plant high pressure heater normal drainage system for recovering the heat of the high pressure heater drainage at low load.
[0004] The technical scheme of the utility model is as follows:
[0005] A full load operation high pressure heater normal drainage system, a No. 1 high pressure heater is connected with a No. 2 high pressure heater in drainage; a No. 2 high pressure heater is connected with a No. 3 high pressure heater in drainage in one way, and the other way of the No. 2 high pressure heater is connected to a deaerator; a No. 3 high pressure heater is connected to the deaerator through a feed water pump in one way of drainage, and the other way of the No. 3 high pressure heater is connected to a flash tank; a No. 5 low pressure heater is connected to the flash tank in drainage; a No. 6 low pressure heater is provided with a low pressure heater drainage pump in a drainage pipeline, and the drainage is discharged into a No. 6 low pressure heater outlet condensate pipeline after being boosted in pressure; a steam side pipeline of the flash tank is connected to a steam side space of the No. 6 low pressure heater, and a water side pipeline of the flash tank is connected to a water side space of the No. 6 low pressure heater.
[0006] A first shut-off valve and a first regulating valve are sequentially arranged on a drainage pipeline from the No. 1 high pressure heater to the No. 2 high pressure heater;
[0007] A second shut-off valve and a second regulating valve are sequentially arranged on a drainage pipeline from the No. 2 high pressure heater to the No. 3 high pressure heater;
[0008] A third shut-off valve, a third regulating valve and a fourth shut-off valve are sequentially arranged on a drainage pipeline from the No. 3 high pressure heater to the flash tank;
[0009] A fifth shut-off valve, a fourth regulating valve and a sixth shut-off valve are sequentially arranged on a drainage pipeline from the No. 5 low pressure heater to the flash tank;
[0010] A seventh shut-off valve is arranged on an inlet of the low pressure heater drainage pump, and a first check valve, a fifth regulating valve and an eighth shut-off valve are sequentially arranged on an outlet of the low pressure heater drainage pump.
[0011] The drain pipe from the second high-pressure heater to the deaerator is respectively provided with a ninth shut-off valve, a sixth regulating valve, a tenth shut-off valve and a second check valve;
[0012] The drain pipe from the third high-pressure heater to the deaerator is sequentially provided with an eleventh shut-off valve, a seventh regulating valve, a twelfth shut-off valve and a third check valve.
[0013] The high-pressure heater drain system provided by the utility model can recycle the heat of the high-pressure heater drain under full load, can ensure the smoothness of the drain under full load, can recycle the heat of the high-pressure heater drain, reduces the coal consumption of the unit, and further improves the reliability and economy of the unit operation. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is the overall principle diagram of the utility model. DETAILED DESCRIPTION
[0015] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of protection of the utility model.
[0016] In the description of the utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.
[0017] As Figure 1 shown, a high-pressure heater normal drain system under full load operation, a high-pressure heater 2 is connected to a second high-pressure heater 3; the second high-pressure heater 3 is connected to a third high-pressure heater 4 in one way, and the other way of the second high-pressure heater 3 is connected to a deaerator 1; the third high-pressure heater 4 is connected to the deaerator 1 through a feed water pump 5 in one way, and the other way of the third high-pressure heater 4 is connected to a flash tank 8; a fifth low-pressure heater 6 is connected to the flash tank 8; a sixth low-pressure heater 7 is provided with a low-pressure heater drain pump 9, and the drain is raised in pressure and discharged into a sixth low-pressure heater outlet condensate pipe 32.
[0018] The steam side pipeline 33 of the flash tank is connected to the steam side space of the sixth low-pressure heater 7, and the water side pipeline 34 of the flash tank is connected to the water side space of the sixth low-pressure heater 7.
[0019] Further, the first shutoff valve 10 and the first regulating valve 11 are arranged on the drain pipeline of the first high-pressure heater 2 to the second high-pressure heater 3 in sequence to regulate the water level of the high-pressure heater.
[0020] The second shutoff valve 12 and the second regulating valve 13 are arranged on the drain pipeline of the second high-pressure heater 3 to the third high-pressure heater 4 in sequence to regulate the water level of the high-pressure heater.
[0021] The third shutoff valve 22, the third regulating valve 23 and the fourth shutoff valve 24 are arranged on the drain pipeline of the third high-pressure heater 4 to the flash tank 8 in sequence to control the drain flow.
[0022] The fifth shutoff valve 25, the fourth regulating valve 26 and the sixth shutoff valve 27 are arranged on the drain pipeline of the fifth low-pressure heater 6 to the flash tank 8 in sequence to control the drain flow.
[0023] The seventh shutoff valve 28 is arranged at the inlet of the low-pressure heater drain pump 9, and the first check valve 29, the fifth regulating valve 30 and the eighth shutoff valve 31 are arranged at the outlet in sequence.
[0024] The ninth shutoff valve 14, the sixth regulating valve 15, the tenth shutoff valve 16 and the second check valve 17 are arranged on the drain pipeline of the second high-pressure heater 3 to the deaerator 1 in sequence to control the flow and prevent backflow.
[0025] The eleventh shutoff valve 18, the seventh regulating valve 19, the twelfth shutoff valve 20 and the third check valve 21 are arranged on the drain pipeline of the third high-pressure heater 4 to the deaerator 1 in sequence to control the flow and prevent backflow.
[0026] Further, the steam side of the flash tank 8 is connected to the steam side space of the sixth low-pressure heater 7 to ensure that the pressure in the flash tank 8 is the same as that of the sixth low-pressure heater 7, so that the drain temperature in the flash tank is consistent with the saturated temperature of the sixth low-pressure heater 7. The water side of the flash tank is connected to the drain of the sixth low-pressure heater 7, and the drains of the third high-pressure heater 4 and the fifth low-pressure heater 6 are discharged into the sixth low-pressure heater 7.
[0027] The utility model will be further described in detail in combination with specific embodiments.
[0028] When the 660MW steam turbine generator set is running at high load (such as load rate > 40%), the second closing valve 12 and the second regulating valve 13 are opened, the ninth closing valve 14, the sixth regulating valve 15, the tenth closing valve 16 and the second check valve 17 are closed, the drain of the second high-pressure heater 3 flows into the third high-pressure heater 4. The third closing valve 22, the third regulating valve 23 and the fourth closing valve 24 are closed, the eleventh closing valve 18, the seventh regulating valve 19, the twelfth closing valve 20 and the third check valve 21 are opened, and the drain of the third high-pressure heater 4 flows into the deaerator 1.
[0029] When the 660MW steam turbine generator set is running at low load (such as load rate < 40%), the conventional technology is that the drain of the third high-pressure heater 4 is discharged to the condenser. In the system, the second closing valve 12 and the second regulating valve 13 are closed, the ninth closing valve 14, the sixth regulating valve 15, the tenth closing valve 16 and the second check valve 17 are opened, the drain of the second high-pressure heater 3 flows into the deaerator 1. The third closing valve 22, the third regulating valve 23 and the fourth closing valve 24 are opened, the eleventh closing valve 18, the seventh regulating valve 19, the twelfth closing valve 20 and the third check valve 21 are closed, and the drain of the third high-pressure heater 4 flows into the flash tank 8. The drain in the flash tank 8 flows into the sixth low-pressure heater 7, and then is pumped by the low-pressure heater drain pump and discharged into the condensate pipeline 32 at the outlet of the sixth low-pressure heater. Compared with the conventional technology, the drain heat of the third high-pressure heater 4 is recovered, thereby reducing the coal consumption of the unit and improving the economic efficiency of the unit.
[0030] The above only describes preferred embodiments of the present application, and it should be pointed out that for those skilled in the art, without departing from the overall concept of the present application, a number of changes and improvements can be made, which should also be considered as the protection range of the present application.
Claims
1. A full load operating high pressure heater normal drain system characterized by: The first high-pressure heater (2) is connected to the second high-pressure heater (3) through a drain pipe. The second high-pressure heater (3) is connected to the third high-pressure heater (4) through a drain pipe, and the other drain pipe of the second high-pressure heater (3) is connected to the deaerator (1). The third high-pressure heater (4) is connected to the deaerator (1) through a drain pipe by the feed water pump (5), and the other drain pipe of the third high-pressure heater (4) is connected to the flash tank (8). The fifth low-pressure heater (6) is connected to the flash tank (8) through a drain pipe. The drain pipe of the sixth low-pressure heater (7) is provided with a low-pressure heater drain pump (9) to increase the pressure of the drain water and discharge the drain water into the sixth low-pressure heater outlet condensate pipe (32). The flash tank steam side pipe (33) of the flash tank (8) is connected to the steam side space of the sixth low-pressure heater (7), and the flash tank water side pipe (34) is connected to the water side space of the sixth low-pressure heater (7).
2. The normal drain system of the high-pressure heater in full load operation according to claim 1, characterized in that: The first shutoff valve (10) and the first regulating valve (11) are arranged in sequence on the drain pipe from the first high-pressure heater (2) to the second high-pressure heater (3). The second shutoff valve (12) and the second regulating valve (13) are arranged in sequence on the drain pipe from the second high-pressure heater (3) to the third high-pressure heater (4). The third shutoff valve (22), the third regulating valve (23) and the fourth shutoff valve (24) are arranged in sequence on the drain pipe from the third high-pressure heater (4) to the flash tank (8). The fifth shutoff valve (25), the fourth regulating valve (26) and the sixth shutoff valve (27) are arranged in sequence on the drain pipe from the fifth low-pressure heater (6) to the flash tank (8). The seventh shutoff valve (28) is arranged at the inlet of the low-pressure heater drain pump (9), and the first check valve (29), the fifth regulating valve (30) and the eighth shutoff valve (31) are arranged in sequence at the outlet of the low-pressure heater drain pump (9). The ninth shutoff valve (14), the sixth regulating valve (15), the tenth shutoff valve (16) and the second check valve (17) are arranged in sequence on the drain pipe from the second high-pressure heater (3) to the deaerator (1). The eleventh shutoff valve (18), the seventh regulating valve (19), the twelfth shutoff valve (20) and the third check valve (21) are arranged in sequence on the drain pipe from the third high-pressure heater (4) to the deaerator (1).