Thermal power plant unit quick starting system based on steam extraction and energy storage

Abstract

The utility model discloses a thermal power plant unit quick starting system based on steam extraction and energy storage, which comprises a heat storage water pump, a heat release water pump, a heat storage water tank with a deoxidizing head, a common heat storage water tank, a steam compressor, a local deaerator, an adjacent deaerator, a local boiler and an adjacent boiler. Saturated water is extracted from an adjacent machine deaerator to enter a hot water storage tank with a deoxidizing head, heat supply steam is extracted at the same time, inlet water of the hot water storage tank with the deoxidizing head is heated to a higher saturation temperature after being pressurized by a steam compressor, and then hot water is stored in a common hot water storage tank for standby application. Medium-temperature hot water stored in a common hot water storage tank in the low-ebb mixing period is adopted for starting, steam of an adjacent machine does not need to heat supplied water of a starting unit deaerator, and therefore the situation that the adjacent machine is limited in external power generation and heat supply can be prevented; the furnace tube is heated on the smoke side and the water side, so that the temperature of the hearth rises quickly, and complete combustion of pulverized coal is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal power equipment, in particular to a thermal power plant unit rapid start system based on steam extraction energy storage. Background Art

[0002] In recent years, with the rapid growth of new energy, the annual utilization hours of thermal power units have been decreasing year by year. The rotation of units for standby has caused the number of unit starts and stops to increase year by year, with a maximum of one start and stop per week, which has greatly increased the start and stop costs of the units. Among them, the loss of coal, water and steam is the main part of the unit startup cost.

[0003] There are many problems with the traditional unit startup method. First, during the unit startup, a large amount of steam from the adjacent unit is needed to heat the feed water of the unit's deaerator in a short period of time, resulting in restrictions on the neighboring unit's external power generation and heat supply; second, when the temperature difference between the boiler water side and the flue gas side is large, the thermal stress of the furnace tube is large, which is prone to cracking of the furnace tube weld; third, at the initial stage of the unit startup, the feed water temperature of the unit's deaerator is low, the heating time is long, the boiler is difficult to warm up, and the pulverized coal is difficult to ignite, which makes the boiler easy to extinguish. Utility Model Content

[0004] In order to solve the above-mentioned technical problems affecting the starting efficiency of the unit, the utility model provides a rapid starting system for the unit of a thermal power plant based on steam extraction energy storage.

[0005] The technical solution of the utility model is achieved in this way:

[0006] A thermal power plant unit rapid start-up system based on steam extraction energy storage, comprising a hot water storage pump, a hot water discharge pump, a hot water storage tank with a deaerator head, a common hot water storage tank, a steam compressor, a local deaerator, an adjacent deaerator, a local boiler and an adjacent boiler;

[0007] A hot water storage pump, wherein the inlet of the hot water storage pump is connected to a pipeline where the outlets of the local deaerator and the adjacent deaerator meet, and the outlet of the hot water storage pump is connected to the water inlet of a hot water storage tank with a deaerator head;

[0008] A hot water discharge pump, wherein the outlet of the hot water discharge pump is respectively connected to the condensate water pipeline of the machine and the condensate water pipeline of the adjacent machine, and the inlet of the hot water discharge pump is connected to the outlet of the hot water storage tank;

[0009] A hot water storage tank with a deaerator head, wherein the outlet of the hot water storage tank with a deaerator head is connected to the hot water discharge pump, and the inlet of the hot water storage tank is connected to the steam compressor and the outlet of the hot water storage pump;

[0010] A common hot water storage tank, used for storing hot water, the common hot water storage tank is connected between the hot water storage tank with deaerator head and the hot water discharge pump;

[0011] A steam compressor, wherein the steam compressor increases the pressure of the heating steam, and the heating steam is introduced into the steam inlet of the steam compressor; the steam outlet of the steam compressor is connected to the steam inlet of the hot water storage tank with a deaerator head;

[0012] The local deaerator and the adjacent deaerator, the outlets of the local deaerator and the adjacent deaerator are both connected to the inlet of the hot water storage pump, the inlet end of the local deaerator is also connected to the local condensate pipeline, and the inlet end of the adjacent deaerator is also connected to the adjacent condensate pipeline;

[0013] The local boiler and the adjacent boiler, the water side of the local boiler is connected to the local deaerator, and the water side of the adjacent boiler is connected to the adjacent deaerator.

[0014] It also includes a pneumatic valve, which is connected between the outlet of the local deaerator and the adjacent deaerator and the inlet of the hot water storage pump. The pneumatic valve is also connected between the outlet of the hot water discharge pump and the local condensate pipeline and the adjacent condensate pipeline to control the extraction and release of hot water.

[0015] The hot water storage pump draws saturated water from the adjacent deaerator into the hot water storage tank with a deaerator head, and simultaneously draws heating steam.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The utility model starts the hot water storage pump during the off-load period of the unit, extracts saturated water from the deaerator of the adjacent unit into the hot water storage tank with a deaerator head, and extracts heating steam at the same time. After the steam compressor boosts the pressure, the inlet water of the hot water storage tank with a deaerator head is heated to a higher saturation temperature, and then the hot water is stored in an ordinary hot water storage tank for standby use. The medium-temperature hot water stored in the ordinary hot water storage tank during the mixing off-load period is used for starting, and the steam of the adjacent unit is not required to heat the feed water of the deaerator of the starting unit, thereby preventing the adjacent unit from being restricted in external power generation and heating. The extraction of hot water for steam heating is carried out during the off-load period, which is equivalent to extracting steam for energy storage during the off-load period, which is highly economical. After the heating steam is boosted by the steam compressor, the energy density of the hot water can be effectively improved.

[0018] 2. The utility model uses water stored in an ordinary hot water storage tank as the starting water supply for the unit. Since the hot water in the ordinary hot water storage tank is used as the starting water supply for the deaerator of the unit, in addition to heating the furnace tubes on the flue gas side, the water side also heats the furnace tubes at the same time. The boiler heats up quickly and has high efficiency. Therefore, the furnace temperature rises quickly, which is conducive to the complete combustion of pulverized coal, reduces combustion heat loss, and improves the combustion efficiency of the boiler. It solves the problem that in the initial stage of the unit startup, the feed water temperature of the deaerator of the unit is low, the heating time is long, the boiler is difficult to warm up, and the pulverized coal is difficult to ignite, resulting in the boiler being easy to extinguish.

[0019] 3. By using hot water from an ordinary hot water storage tank as the starting water supply for the deaerator of this machine and increasing the temperature on the water side, the temperature difference between the water side and the flue gas side becomes smaller, reducing the thermal stress of the furnace tube, preventing equipment damage such as cracking of the furnace tube weld, effectively improving the service life and utilization rate of the equipment, and reducing the occurrence of unit non-stop events due to damage to the furnace tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The utility model is a structural schematic diagram of a rapid start-up system for thermal power plant units based on steam extraction energy storage.

[0021] 1. Hot water storage pump; 2. Hot water discharge pump; 3. Hot water storage tank with deaerator head; 4. Ordinary hot water storage tank; 5. Steam compressor; 6. Heating steam; 7. Condensate pipe of this machine; 8. Condensate pipe of adjacent machine; 9. Deaerator of adjacent machine; 10. Deaerator of this machine; 11. Pneumatic valve; 12. Boiler of this machine; 13. Boiler of adjacent machine. DETAILED DESCRIPTION

[0022] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the embodiment described below is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] like Figure 1 As shown, a quick start system of a thermal power plant unit based on steam extraction energy storage includes a hot water storage pump, a hot water discharge pump, a hot water storage tank with a deaerator head, a common hot water storage tank, a steam compressor, a local deaerator, an adjacent deaerator, a local boiler and an adjacent boiler;

[0024] A hot water storage pump 1, wherein the inlet of the hot water storage pump 1 is connected to a pipeline where the outlets of the local deaerator 10 and the adjacent deaerator 9 meet, and the outlet of the hot water storage pump 1 is connected to the water inlet end of the hot water storage tank 3 with a deaerator head;

[0025] A hot water discharge pump 2, wherein the outlet of the hot water discharge pump 2 is respectively connected to the condensate water pipeline 7 of the machine and the condensate water pipeline 8 of the adjacent machine, the inlet of the hot water discharge pump is connected to the outlet of the hot water storage tank, and the inlet of the hot water discharge pump 2 is connected to the outlet of the hot water storage tank;

[0026] A hot water storage tank 3 with a deaerator head, wherein the outlet of the hot water storage tank 3 with a deaerator head is connected to the hot water discharge pump 2, and the inlet of the hot water storage tank 3 is connected to the steam compressor 5 and the outlet of the hot water storage pump 1;

[0027] A common hot water storage tank 4, used for storing hot water, the common hot water storage tank 4 is connected between the hot water storage tank with deaerator head 3 and the hot water discharge pump 2;

[0028] A steam compressor 5, wherein the steam inlet of the steam compressor 5 is fed with heating steam 6; the steam outlet of the steam compressor 5 is connected to the steam inlet of the hot water storage tank 3 with a deaerator head;

[0029] The local deaerator 10 and the adjacent deaerator 9, the outlets of the local deaerator 10 and the adjacent deaerator 9 are both connected to the inlet of the hot water storage pump 1, the inlet end of the local deaerator 10 is also connected to the local condensate pipeline 7, and the inlet end of the adjacent deaerator 9 is also connected to the adjacent condensate pipeline 8;

[0030] The local boiler 12 and the adjacent boiler 13 , the water side of the local boiler 12 is connected to the local deaerator 10 , and the water side of the adjacent boiler 13 is connected to the adjacent deaerator 9 .

[0031] It also includes a pneumatic valve 11, which is connected between the outlet of the local deaerator 10 and the adjacent deaerator 9 and the inlet of the hot water storage pump 1. The pneumatic valve 11 is also connected between the outlet of the hot water discharge pump 2 and the local condensate pipeline 7 and the adjacent condensate pipeline 8 to control the extraction and release of hot water.

[0032] The hot water storage pump 1 extracts saturated water from the adjacent deaerator 9 into the hot water storage tank with a deaerator head 3, and extracts heating steam 6 at the same time.

[0033] In this embodiment, the saturated water of the adjacent deaerator 9 is pumped to the deaerator head hot water tank 3 by the hot water storage pump 1 in advance. At the same time, the steam energy after the steam compressor 5 is pressurized can heat the water inlet of the deaerator head hot water tank 3 to a higher saturation temperature and increase the energy density of the hot water. The hot water is then stored in the common hot water storage tank 4 for standby use. When the unit is started, the high energy density hot water stored in the common hot water storage tank 4 is pumped to the condensate pipe 7 of the unit through the hot water discharge pump 2, and then enters the deaerator 10 of the unit to form a loop, thereby solving the problem of long unit startup time in the prior art.

[0034] The working process and principle of the utility model are as follows:

[0035] During the load trough period, the hot water storage pump 1 is started in advance to extract saturated water from the adjacent deaerator 9 into the hot water storage tank with deaerator head 3. At the same time, a certain amount of heating steam 6 is extracted from the two outlet pipes of the medium-pressure heating steam manifold. After being pressurized by the steam compressor 5, the inlet water of the hot water storage tank with deaerator head 3 is heated to a higher saturation temperature, and then the hot water is stored in the common hot water storage tank 4 for standby use.

[0036] When the unit is started, the hot water pump 2 is started to mix the high-energy-density hot water with the condensate 7 of the unit from the common hot water storage tank 4 and send it to the deaerator 10 of the unit as the starting water supply of the unit. In the initial stage of the unit startup, the condensate temperature of the unit is low, and the condensate is not sent to the deaerator 10 of the unit. The starting water supply of the deaerator 10 of the unit comes entirely from the hot water in the common hot water storage tank 4. As the fuel gradually increases after the ignition of the local boiler 12, the feed water temperature of the local deaerator 10 continues to rise. At this time, the local condensate pipeline 7 is adjusted to control the flow of condensate entering the local deaerator 10, so as to keep the feed water temperature of the local deaerator 10 at a reasonable level. Since the hot water from the ordinary hot water storage tank 4 is used as the startup feed water for the local deaerator 10, the temperature is high. In addition to heating the furnace tubes on the flue gas side, the water side also heats the furnace tubes at the same time, so that the furnace temperature rises quickly, which is conducive to the complete combustion of coal powder, reduces combustion heat loss, and improves the combustion efficiency of the boiler. The startup feed water temperature is high, and the local boiler heats up and increases the pressure quickly, which is conducive to the control of the main re-steam temperature of the local boiler 12. In addition, using the hot water from the ordinary hot water storage tank 4 as the startup feed water for the local deaerator 10 can increase the water side temperature of the local boiler 12, so that the temperature difference between the water side and the flue gas side of the local boiler 12 becomes smaller, the thermal stress of the furnace tube is reduced, and equipment damage such as cracking of the furnace tube weld is prevented, effectively improving the service life and utilization rate of the equipment. In addition, this embodiment can further reduce the startup feed water flow of the unit and increase energy-saving benefits.

[0037] The above detailed description of the specific implementation of the utility model is only used as an example. The utility model is not limited to the specific implementation described above. The technicians in the industry should understand that the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A rapid start-up system for a thermal power plant unit based on steam extraction energy storage, comprising a hot water storage pump (1), a hot water discharge pump (2), a hot water storage tank with a deaerator head (3), a common hot water storage tank (4), a steam compressor (5), a local deaerator (10), an adjacent deaerator (9), a local boiler (12) and an adjacent boiler (13), characterized in that: The inlet of the hot water storage pump (1) is connected to a pipeline that joins the outlets of the local deaerator (10) and the adjacent deaerator (9), and the outlet of the hot water storage pump (1) is connected to the water inlet end of the hot water storage tank (3) with a deaerator head; The common hot water storage tank (4) is connected between the hot water storage tank with a deaerator head (3) and the hot water discharge pump (2); The steam compressor (5) increases the pressure of the heating steam (6), and the heating steam (6) is introduced into the steam inlet end of the steam compressor (5); The outlets of the local deaerator (10) and the adjacent deaerator (9) are both connected to the inlet of the hot water storage pump (1); The water side of the local boiler (12) is connected to the local deaerator (10), and the water side of the adjacent boiler (13) is connected to the adjacent deaerator (9); The hot water storage pump (1) extracts saturated water from the adjacent deaerator (9) into the hot water storage tank with a deaerator head (3), and simultaneously extracts heating steam (6).

2. A rapid start-up system for thermal power plant units based on steam extraction energy storage according to claim 1, characterized in that: It also comprises a pneumatic valve (11), wherein the pneumatic valve (11) is connected between the outlets of the local deaerator (10) and the adjacent deaerator (9) and the inlet of the hot water storage pump (1).

3. A rapid start-up system for thermal power plant units based on steam extraction energy storage according to claim 2, characterized in that: The pneumatic valve (11) is also connected between the outlet of the hot water pump (2) and the condensate pipe (7) of the machine and the condensate pipe (8) of the adjacent machine.

4. A rapid start-up system for thermal power plant units based on steam extraction energy storage according to claim 1, characterized in that: The outlet of the hot water discharge pump (2) is respectively connected to the condensate pipeline (7) of the local machine and the condensate pipeline (8) of the adjacent machine, and the inlet of the hot water discharge pump (2) is connected to the outlet of the hot water storage tank.

5. A rapid start-up system for thermal power plant units based on steam extraction energy storage according to claim 1, characterized in that: The outlet of the hot water storage tank with deaerator head (3) is connected to the hot water discharge pump (2), and the inlet thereof is connected to the steam compressor (5) and the outlet of the hot water storage pump (1).

6. A rapid start-up system for thermal power plant units based on steam extraction energy storage according to claim 1, characterized in that: The steam outlet end of the steam compressor (5) is connected to the steam inlet end of the hot water storage tank (3) with a deaerator head.

7. A rapid start-up system for thermal power plant units based on steam extraction energy storage according to claim 1, characterized in that: The inlet end of the local deaerator (10) is also connected to the local condensate pipeline (7), and the inlet end of the adjacent machine deaerator (9) is also connected to the adjacent machine condensate pipeline (8).

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