Heat storage frequency modulation system of thermal power plant

Abstract

The heat storage frequency modulation system comprises a heat storage water tank, the water inlet end of the heat storage water tank is connected with a variable-frequency heat storage pump used for heating and boosting introduced condensed water, the water outlet end of the heat storage water tank is connected with a variable-frequency heat release pump, and the outlet end of the variable-frequency heat release pump is connected with a deaerator. By means of the variable frequency heat storage pump and the variable frequency heat release pump, the frequency modulation requirement of a power grid can be quickly responded, the frequency modulation efficiency can be improved, the heat storage water tank is used for storing condensed water and heat, the frequency modulation capacity of the system is increased, and the frequency modulation efficiency of the system is improved. The frequency modulation and peak regulation capability of a thermal power plant is improved, and the requirements of a power grid for deep peak regulation and continuous frequency modulation are met through a heat energy absorption and output mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal power generation, in particular to a heat storage frequency modulation system for a thermal power plant. Background Art

[0002] With the transformation of the global energy structure and the increasing emphasis on environmental protection, achieving carbon peak and carbon neutrality is a broad and profound economic and social systematic transformation, and has also become an important goal for governments and enterprises of various countries.

[0003] In this context, the traditional electric energy storage frequency modulation devices in thermal power plants have problems such as a single form, small capacity, and poor frequency modulation persistence, and cannot meet the requirements of the power grid for deep peak shaving and continuous frequency modulation. Therefore, developing a new type of heat storage frequency modulation system and using the steam extraction heat storage device to participate in the power grid frequency modulation and peak shaving has important practical application value. Summary of the Invention

[0004] The utility model provides a heat storage frequency modulation system for a thermal power plant to solve the above-mentioned existing technical problems.

[0005] The technical solution of the utility model is realized as follows:

[0006] A heat storage frequency modulation system for a thermal power plant includes a hot water storage tank. The water inlet end of the hot water storage tank is connected with a variable-frequency heat storage pump for heating and boosting the incoming condensate water. The water outlet end of the hot water storage tank is connected with a variable-frequency heat release pump, and the outlet end of the variable-frequency heat release pump is connected with a deaerator.

[0007] Further, a heat storage regulating valve is connected between the variable-frequency heat storage pump and the hot water storage tank, and a heat release regulating valve is connected between the variable-frequency heat release pump and the deaerator.

[0008] Further, a spare heat storage regulating spare valve is also connected between the variable-frequency heat storage pump and the hot water storage tank.

[0009] Further, a spare heat release regulating spare valve is also connected between the variable-frequency heat release pump and the deaerator.

[0010] Further, the heat storage regulating spare valve and the heat storage regulating valve are arranged in parallel between the variable-frequency heat storage pump and the hot water storage tank.

[0011] Further, the heat release regulating valve and the heat release regulating spare valve are arranged in parallel between the variable-frequency heat release pump and the deaerator.

[0012] Further, the inlet end of the variable-frequency heat storage pump is communicated with an external condensate water pipeline, and a first electric isolation valve is arranged between the variable-frequency heat storage pump and the external condensate water pipeline.

[0013] Furthermore, a second electric isolation valve is also provided between the variable-frequency heat release heat pump and the deaerator.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] By providing a variable-frequency heat storage heat pump and a variable-frequency heat release heat pump, when the power grid requires a thermal power plant to down-regulate the peak load and reduce the load, the variable-frequency heat storage heat pump is started. The variable-frequency heat storage heat pump is used to transport and store the condensate with a certain pressure and temperature to the hot water storage tank through the heat storage regulating valve via a pipeline. When the power grid needs the generator set to increase the load quickly to reach the peak, the variable-frequency heat release heat pump is started. When the generator set needs to increase the load quickly to reach the peak, the variable-frequency heat release heat pump transports the stored condensate and heat to the deaerator, which can quickly respond to the power grid frequency modulation demand, improve the frequency modulation efficiency. At the same time, the hot water storage tank is used to store the condensate and heat, increasing the frequency modulation capacity of the system, and solving the problems of the traditional electric energy storage frequency modulation device of the thermal power plant, such as single form, small capacity, and poor frequency modulation persistence. The utility model can meet the requirements of the power grid for deep peak shaving and continuous frequency modulation. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of a heat storage frequency modulation system of a thermal power plant of the utility model.

[0017] 1. Hot water storage tank; 2. Deaerator; 3. Variable-frequency heat release heat pump; 4. Variable-frequency heat storage heat pump; 5. Heat storage regulating standby valve; 6. Heat storage regulating valve; 7. Heat release regulating valve; 8. Heat release regulating standby valve; 9. First electric isolation valve; 10. Second electric isolation valve; 11. Condensate pipeline. Specific Embodiments

[0018] To make the objectives, features, and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described below are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0020] Unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0021] As Figure 1 shown, a heat storage frequency modulation system for a thermal power plant includes a hot water storage tank 1. The inlet end of the hot water storage tank 1 is connected to a variable frequency heat storage pump 4 for heating and boosting the incoming condensate water. The outlet end of the hot water storage tank 1 is connected to a variable frequency heat release pump 3, and the outlet end of the variable frequency heat release pump 3 is connected to a deaerator 2.

[0022] In this embodiment, the variable frequency heat storage pump 4 is used to transport and store the condensate water with a certain pressure and temperature through a heat storage regulating valve 6 via a pipeline into the hot water storage tank 1. When the generator set needs to increase the load quickly to reach the peak, the variable frequency heat release pump 3 transports the stored condensate water and heat to the deaerator 2.

[0023] Furthermore, a heat storage regulating valve 6 is connected between the variable frequency heat storage pump 4 and the hot water storage tank 1, and a heat release regulating valve 7 is connected between the variable frequency heat release pump 3 and the deaerator 2. The heat storage regulating valve 6 controls the storage flow of the condensate water to ensure the stable operation of the heat storage system, and the heat release regulating valve 7 controls the flow during the heat release process to ensure the efficient operation of the system.

[0024] Furthermore, a spare heat storage regulating valve 5 is also connected between the variable frequency heat storage pump 4 and the hot water storage tank 1.

[0025] Furthermore, a spare heat release regulating valve 8 is also connected between the variable frequency heat release pump 3 and the deaerator 2.

[0026] Furthermore, the spare heat storage regulating valve 5 and the heat storage regulating valve 6 are arranged in parallel between the variable frequency heat storage pump 4 and the hot water storage tank 1.

[0027] Further, the exothermic regulating valve 7 and the standby exothermic regulating valve 8 are arranged in parallel between the variable-frequency heat release pump 3 and the deaerator 2.

[0028] Further, the inlet end of the variable-frequency heat storage pump 4 is connected to the external condensate pipeline 11, and a first electric isolating valve 9 is arranged between the variable-frequency heat storage pump 4 and the external condensate pipeline 11.

[0029] Further, a second electric isolating valve 10 is also arranged between the variable-frequency heat release pump 3 and the deaerator 2.

[0030] The working process and principle of the present utility model are as follows:

[0031] Heat storage frequency modulation stage: When the power grid requires the thermal power plant to reduce the peak load downward, the variable-frequency heat storage pump 4 is started, and the condensate water with a certain pressure and a certain temperature is transported and stored into the heat storage water tank 1 through the heat storage regulating valve 6. The thermal power generating unit can quickly reduce the condensate working medium of the steam generated by combustion through the variable-frequency heat storage pump 4, which can accelerate the frequency modulation rate of the unit. At the same time, the condensate working medium and heat are stored. In particular, when the heat storage regulating valve 6 fails and cannot be used, the standby heat storage regulating valve 5 can be used to ensure the reliable operation of the system.

[0032] Exothermic frequency modulation stage: When the power grid requires the generating unit to quickly peak up the load, the variable-frequency heat release pump 3 is started, and the condensate water with a certain pressure and a certain temperature is transported to the deaerator 2 of the thermal power generating unit through the exothermic regulating valve 7, increasing the output of the deaerator 2 and quickly outputting the generated electricity. In particular, when the exothermic regulating valve 7 fails and cannot be used, the standby exothermic regulating valve 8 can be used to ensure the reliable operation of the system.

[0033] In addition, when the heat storage frequency modulation system fails, the first electric isolating valve 9 and the second electric isolating valve 10 are closed to isolate the heat storage frequency modulation system from the generating unit to ensure the safe operation of the generating unit.

[0034] The specific embodiments of the utility model have been described in detail above, but it is only an example. The present utility model is not limited to the specific embodiments described above. Those skilled in the art should understand that the above embodiments and the descriptions in the specification only illustrate the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A thermal storage frequency modulation system for a thermal power plant, characterized in that: The invention comprises a hot water storage tank (1), wherein the water inlet end of the hot water storage tank (1) is connected to a variable frequency heat storage pump (4) for increasing the temperature and pressure of the condensed water introduced therein, the water outlet end of the hot water storage tank (1) is connected to a variable frequency heat release pump (3), and the outlet end of the variable frequency heat release pump (3) is connected to a deaerator (2).

2. A thermal storage frequency modulation system for a thermal power plant according to claim 1, characterized in that: A heat storage regulating valve (6) is connected between the variable frequency heat storage pump (4) and the hot water storage tank (1), and a heat release regulating valve (7) is connected between the variable frequency heat release pump (3) and the deaerator (2).

3. The thermal storage frequency modulation system of a thermal power plant according to claim 1, characterized in that: A spare heat storage regulating spare valve (5) is also connected between the variable frequency heat storage pump (4) and the hot water storage tank (1).

4. The thermal storage frequency modulation system of a thermal power plant according to claim 3, characterized in that: A spare heat release regulating spare valve (8) is also connected between the variable frequency heat release pump (3) and the deaerator (2).

5. The thermal storage frequency modulation system of a thermal power plant according to claim 3, characterized in that: The heat storage regulating standby valve (5) and the heat storage regulating valve (6) are arranged in parallel between the variable frequency heat storage pump (4) and the hot water storage tank (1).

6. A thermal storage frequency modulation system for a thermal power plant according to claim 2, characterized in that: The heat release regulating valve (7) and the heat release regulating standby valve (8) are arranged in parallel between the variable frequency heat release pump (3) and the deaerator (2).

7. The thermal storage frequency modulation system of a thermal power plant according to claim 1, characterized in that: The inlet end of the variable frequency heat storage pump (4) is connected to an external condensate water pipeline (11), and a first electric isolation valve (9) is provided between the variable frequency heat storage pump (4) and the external condensate water pipeline (11).

8. The thermal storage frequency modulation system of a thermal power plant according to claim 1, characterized in that: A second electric isolation valve (10) is also provided between the variable frequency heat release pump (3) and the deaerator (2).

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