An energy storage heating system adapted for power spot trading

Abstract

The present application relates to the technical field of energy utilization, and especially relates to an energy storage heating energy supply system suitable for electricity spot trading, which comprises a unit module, a first heating module, a second heating module and a heat storage module. The first heating module comprises a condenser and a condensate pump. The second heating module comprises a heating return water pipe, a heating drainage pipe, an electric heating pump, a low-pressure cylinder drainage pipe and a plant circuit. The heating return water pipe has two paths, one of which is communicated with the condenser, and the other of which is communicated with the heating drainage pipe. The heating drainage pipe is communicated with the condenser and the electric heating pump. The electric heating pump is communicated with the heat storage pool. The present application can realize step-by-step utilization of the low-pressure cylinder exhaust steam through the first heating module, the second heating module and the cross-season heat storage pool, so that the unit external heating load can fluctuate between 0 and 300% under the condition of determined electric load, and the minimum external electric load of the pure condensing unit can be reduced to 10% THA.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy utilization, and in particular to an energy storage heating energy system suitable for electricity spot trading. BACKGROUND

[0002] High back pressure heating refers to increasing the pressure of exhaust steam in the condenser, using hot network circulating water to cool the exhaust steam, so as to realize the heating of the latent heat of vaporization of the exhaust steam of the turbine unit, and realize heating; this technology has low heating energy consumption; but has the following shortcomings: (1) strong coupling of heat and electricity, poor operation flexibility, when the heating capacity is constant, the electric load regulation capacity is less than 5%, (2) high requirement for the stability of the hot network operation, when the hot network circulating water leaks, it may cause insufficient cooling water of the unit and the exhaust temperature rises, thereby threatening the safe operation of the unit.

[0003] The medium and low pressure joint pipe heating and low pressure cylinder zero output heating technology both use the exhaust steam of the medium pressure cylinder to heat the hot network circulating water, in this way, the operation flexibility of the unit is large, but the exhaust steam of the medium pressure cylinder has high energy quality, and directly heating the hot network circulating water has the loss of work capacity, and the heating energy consumption is high. SUMMARY

[0004] This section aims to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, abstract and title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0005] In view of the above problems of low energy consumption but weak flexibility of high back pressure heating and high energy consumption of medium pressure cylinder exhaust heating, the present application is proposed.

[0006] Therefore, the purpose of the present application is to provide an energy storage heating energy system suitable for electricity spot trading.

[0007] To solve the above technical problems, the present application provides the following technical scheme: an energy storage heating energy system suitable for electricity spot trading, comprising a unit module, further comprising a first heating module, comprising a condenser and a condensate pump; a second heating module, comprising a heating return water pipe, a heating drain pipe, an electric heating pump, a low pressure cylinder drain pipe and a plant power circuit; a heat storage module, comprising a heat storage pool; the heating return water pipe has two paths, one path is communicated with the condenser, and the other path is communicated with the heating drain pipe, the heating drain pipe is communicated with the condenser, the heating drain pipe is further communicated with the electric heating pump, and the electric heating pump is communicated with the heat storage pool.

[0008] As a preferred solution of the energy storage heating energy system adapting to the electricity spot transaction, the unit module comprises a medium-pressure cylinder, a low-pressure cylinder and a generator, the medium-pressure cylinder, the low-pressure cylinder and the generator are coaxially arranged, and the medium-pressure cylinder and the low-pressure cylinder are communicated through a steam supply pipeline.

[0009] As a preferred solution of the energy storage heating energy system adapting to the electricity spot transaction, the exhaust end of the low-pressure cylinder is communicated with an input end of a condenser, an output end of the condenser is communicated with a condensate pump, and an output end of the condensate pump is communicated with a condensate discharge pipe.

[0010] As a preferred solution of the energy storage heating energy system adapting to the electricity spot transaction, the heating return water pipe is communicated with external heating return water, a path 1 of the heating return water pipe inputs the condenser, the heating return water is discharged to a heating drainage pipe after being heated, and a path 2 of the heating return water pipe is communicated with the heating drainage pipe.

[0011] As a preferred solution of the energy storage heating energy system adapting to the electricity spot transaction, the electric heating pump is provided with a cold side and a hot side, the hot side is provided with two heaters, one of the heaters is driven by external auxiliary power circuit, and the other heater is driven by a low-pressure cylinder drain pipe.

[0012] As a preferred solution of the energy storage heating energy system adapting to the electricity spot transaction, an input end of the low-pressure cylinder drain pipe is communicated with the exhaust of the low-pressure cylinder, an output end of the low-pressure cylinder drain pipe is communicated with the hot side of the electric heating pump, and an output end of the hot side of the electric heating pump is communicated with the condensate pump.

[0013] As a preferred solution of the energy storage heating energy system adapting to the electricity spot transaction, the heating drainage pipe is also divided into two paths, one path is directly discharged to the outside, and the other path is communicated to the cold side of the electric heating pump.

[0014] As a preferred solution of the energy storage heating energy system adapting to the electricity spot transaction, the heat storage module further comprises a water supply pipeline and a heating pipeline, the water supply pipeline is communicated with an input end of a heat storage pool, and the heating pipeline is communicated with external heating water supply.

[0015] As a preferred solution of the energy storage heating energy system adapting to the electricity spot transaction, the heating return water pipe is provided with a second adjusting valve, a second check valve, a third adjusting valve and a third isolation valve.

[0016] As a preferred scheme of the energy storage heating energy system adapting to the electricity spot transaction, the first check valve, the first regulating valve and the first isolation valve are arranged on the low-pressure cylinder drainage pipe.

[0017] The application has the advantages that: by arranging the first heating module, the second heating module and the cross-season heat storage pool, the exhaust steam of the low-pressure cylinder can be utilized in stages, so that the heat supply of the low-pressure cylinder can be realized in the following aspects:

[0018] (1) In the case of determined electric load, the general high-back-pressure unit has a heat load fluctuation degree of no more than 5%; in the case of determined electric load, the heat load supplied by the unit in the application can fluctuate between 0 and 300%.

[0019] (2) In the non-heating season, the minimum external electric load of the general pure condensing unit is generally 30% THA; in the application, the minimum external electric load of the pure condensing unit can be reduced to 10% THA.

[0020] (3) The unit can realize flexible electric quotation and flexible operation adjustment under the electricity spot transaction, and the revenue of the electricity spot transaction can be greatly increased.

[0021] (4) In the case of large electric load fluctuation of the unit in the heating season, the resident heating heat load is stably output, and in the non-heating season, the heat storage pool can store heat to assist in reducing the external electric load of the unit, and the heat in the non-heating season can be stored for the resident heating demand in the heating season. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0023] Fig. 1 It is a whole schematic diagram of the energy storage heating energy system adapting to the electricity spot transaction.

[0024] Fig. 2 It is a judgment flow chart of the energy storage heating energy system adapting to the electricity spot transaction. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the specific embodiments of the application will be described in detail below with reference to the drawings of the specification.

[0026] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details set forth in this description. In other instances, well-known methods, procedures, components, and circuits have not been described in detail so as not to unnecessarily obscure aspects of the present application.

[0027] It should also be noted that, as used in the specification and in the claims, the article "a", "an", or "the" is intended to mean that there is at least one of the particular feature. For example, "an element" shall mean that there is at least one element.

[0028] It should also be noted that, as used in the specification and in the claims, the article "a", "an", or "the" is intended to mean that there is at least one of the particular feature. For example, "an element" shall mean that there is at least one element.

[0029] Embodiment 1

[0030] Reference Figs. 1-2 For the first embodiment of the present application, the embodiment provides an energy storage heating energy system suitable for power spot trading, comprising a unit module 100, further comprising a first heating module 200, comprising a condenser 201 and a condensate pump 202; a second heating module 300, comprising a heating return water pipe 301, a heating drainage pipe 302, an electric heating pump 303, a low-pressure cylinder 102 drain pipe and a plant circuit 305; a heat storage module 400, comprising a heat storage pool 402; the heating return water pipe 301 has two paths, one path is in communication with the condenser 201, and the other path is in communication with the heating drainage pipe 302, the heating drainage pipe 302 is in communication with the condenser 201, and the heating drainage pipe 302 is also in communication with the electric heating pump 303, and the electric heating pump 303 is in communication with the heat storage pool 402.

[0031] Specifically, the unit module 100 comprises a medium-pressure cylinder 101, a low-pressure cylinder 102, a generator 103 and a steam supply pipeline 104, the medium-pressure cylinder 101, the low-pressure cylinder 102 and the generator 103 are coaxially arranged, the medium-pressure cylinder 101 and the low-pressure cylinder 102 are in communication through the steam supply pipeline 104, an adjusting valve is arranged on the steam supply pipeline 104 for adjusting the steam flow, and the medium-pressure cylinder 101 and the low-pressure cylinder 102 generate electricity through steam expansion.

[0032] Further, the exhaust end of the low-pressure cylinder 102 is in communication with the input end of the condenser 201, the output end of the condenser 201 is in communication with the condensate pump 202, and the output end of the condensate pump 202 is in communication with the condensate discharge pipe 203. The low-pressure exhaust enters the condenser 201 and is condensed, and then is discharged by the condensate pump 202.

[0033] Further, the heating return water pipe 301 is in communication with the external heating return water. The path 1 of the heating return water pipe 301 inputs the condenser 201, and the heating return water is discharged to the heating drainage pipe 302 after being heated. The path 2 of the heating return water pipe 301 is in communication with the heating drainage pipe 302. The external heating return water can enter the condenser 201 through the heating return water pipe 301, be preliminarily heated by the low-pressure exhaust, and be discharged to the outside through the heating drainage pipe 302 after being heated. The heating return water can also not enter the condenser 201, but directly flow into the heating drainage pipe 302.

[0034] Further, the electric heating pump 303 is provided with a cold side and a hot side, and the hot side is provided with two heaters. One heater is driven by the external plant circuit 305, and the other heater is driven by the low-pressure cylinder 102 drain pipe. The preliminarily heated heating drainage can enter the electric heating pump 303 through the heating drainage pipe 302 for further heating. The electric heating pump 303 can be heated by the low-pressure cylinder 102 exhaust or by electricity.

[0035] Further, the input end of the low-pressure cylinder 102 drain pipe is in communication with the exhaust of the low-pressure cylinder 102, the output end of the low-pressure cylinder 102 drain pipe is in communication with the hot side of the electric heating pump 303, and the output end of the hot side of the electric heating pump 303 is in communication with the condensate pump 202. The low-pressure cylinder 102 drain pipe can introduce the low-pressure cylinder 102 exhaust into the electric heating pump 303, bypassing the condenser 201, and cooperate to adjust the power consumption of the electric heating pump 303 to adjust the external power load and the heating load of the unit.

[0036] Further, the heating drainage pipe 302 is also divided into two paths, one path directly discharges to the outside, and the other path is in communication with the cold side of the electric heating pump 303. The heating drainage pipe 302 can choose to send the heating return water for heating or directly discharge to the outside.

[0037] Further, the heat storage module 400 further comprises a water supply pipeline 401 and a heating pipeline 403, the water supply pipeline 401 is communicated with the input end of the heat storage pool 402, the heating pipeline 403 is communicated with the external heating water supply, the water supply pipeline 401 is used for sending the water heated by the electric heating pump 303 into the heat storage pool 402, the heat storage pool 402 is used for storing heat, in the heating season, the heat storage pool 402 realizes the stable output of the resident heating heat load under the condition that the unit electric load fluctuates greatly through the storage or release of hot water, in the non-heating season, the heat storage pool 402 can be used for storing heat to assist the unit external electric load reduction, and the heat stored in the non-heating season is used for the resident heating demand in the heating season.

[0038] Further, the heating return water pipe 301 is provided with a second adjusting valve 301a, a second check valve 301b, a third adjusting valve 301c and a third isolation valve 301d, the low-pressure cylinder 102 drain pipe is provided with a first check valve 304a, a first adjusting valve 304b and a first isolation valve 304c, the heating pipeline 403 is provided with a fourth adjusting valve 403a and a fourth isolation valve 403b, and each valve is used for controlling water flow, steam flow and the like.

[0039] Embodiment 2

[0040] Reference Figs. 1-2 For the second embodiment of the application, which is different from the first embodiment, in the heating season, the unit needs to operate in a high back pressure state, enters the heating season mode, at this time, the maximum heat supply of the unit and the electric heating pump 303 combination and the unit external electric load are obtained by calculation.

[0041] Specifically, the maximum heat supply of the unit is Qmax, the unit external electric load is P, the relationship between the maximum heat supply of the unit and the unit external electric load is Qmax=f(P), when the electric load is P, the size relationship between the real-time load Q of the heat user and Qmax is judged.

[0042] Q is obtained by the unit test, the maximum heat supply Qmax=the maximum exhaust steam capacity of the low-pressure cylinder x (the exhaust steam enthalpy value-the enthalpy value of the drain water after cooling). For different types of units, the maximum exhaust steam capacity of the low-pressure cylinder is different under the electric load P.

[0043] Further, when Q is less than or equal to Qmax, the heating return water of the external environment enters the condenser 201 through the heating return water pipe 301 of path 1 and is heated to 75 DEG C, then enters the electric heating pump 303 through the heating drain pipe 302, the electric heating pump 303 heats the heat network water from 75 DEG C to 100 DEG C through the electric drive and the recovered steam turbine exhaust heat, and finally flows into the heat storage pool 402 for storage, the heating pipeline 403 of the heat storage pool 402 is partially opened through the fourth adjusting valve 403a and the fourth isolation valve 403b, and part of the surplus water supply is supplied to the outside and stored.

[0044] Further, when Q is greater than Qmax, the heating return water from the outside enters the condenser 201 through the heating return water pipe 301 of path 1 to be heated to 75℃, and then enters the electric heating pump 303 through the heating drainage pipe 302. The electric heating pump 303 heats the heat network water from 75℃ to 100℃ by electric driving and recovered steam turbine exhaust heat, and finally flows into the heat storage pool 402 for storage. The heating pipeline 403 of the heat storage pool 402 is opened with increased opening range of the fourth regulating valve 403a and the fourth isolation valve 403b, and the stored hot water in the pool is released to meet the heating demand of the heating user.

[0045] Further, according to the deep regulation requirement of the power grid, the electric heating pump 303 is turned on to reduce the external power supply load of the unit, and the heat storage pool 402 is used for heat load supply regulation. During the variable load operation of the unit, the main steam flow of the steam turbine is adjusted, and the exhaust flow of the steam turbine changes accordingly. The external power supply load of the unit and the heating heat load are adjusted by adjusting the exhaust flow into the primary heating module 200 and the secondary heating module 300 and the electric heating power of the electric heating pump 303 in the secondary heating module 300.

[0046] Embodiment 3

[0047] Reference Figs. 1-2 For the third embodiment of the application, which is different from the above embodiments: in the non-heating season, the unit operates in the conventional back pressure state, and the heating return water from the outside enters the electric heating pump 303 directly through the heating return water pipe 301 of path 2, and then flows into the heat storage pool 402 after being heated by the electric heating pump 303.

[0048] Further, the size relationship between the electricity spot transaction price and the unit power generation cost price is determined.

[0049] Further, when the electricity spot transaction price is less than or equal to the unit power generation cost price, the secondary heating module 300 is turned on, the electric heating pump 303 is powered by the unit power generation, the external power supply load of the unit is reduced, the heating return water is heated by the electric heating pump 303 and stored in the heat storage pool 402, and the heat is stored across seasons for heating in the heating season.

[0050] Further, when the electricity spot transaction price is greater than the unit power generation cost price, the secondary heating module 300 is closed, the heating return water directly enters the heating drainage pipe 302 through path 2 of the heating return water pipe 301, and then is discharged to the outside from the heating drainage pipe 302 without being heated, and the unit power generation is supplied to the outside,

[0051] The power plant can be configured with an electric heat pump according to actual production needs, and a heat pump with a heat supply of 50-200 MW can be configured, and when the electric heat pump supplies heat of 60 MW, the electricity consumption is about 15 MW, at which time the external power load of the unit is reduced by 15 MW. (The ratio of heat supply to electricity consumption is 4).

[0052] It is important to note that the construction and arrangement of the application shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described in the application. For example, elements shown as integrally formed can be constructed of multiple parts or elements, the position of elements can be reversed or otherwise varied, and the nature or number of elements or positions can be altered or varied. Accordingly, all such variations are intended to be included within the scope of the present application. The order or sequence of any process or method steps can be changed or re-sequenced without departing from the scope of the application. Any "means plus function" clauses are intended to cover the structures described herein as performing claimed functions and not only structural equivalents, but also equivalent structures. Other substitutions, modifications, changes, and omissions can be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of the application. Accordingly, the present application is not limited to the particular embodiments described in the specification, but extends to any embodiments that would fall within the scope of the appended claims.

[0053] Also, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation can not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the application, or those unrelated to enabling the claimed application).

[0054] It should be understood that numerous specific implementations can be made within the scope of the present application, and that the general description of the application described above is not intended to limit the application to a specific embodiment but is merely meant to provide examples of the application. While the application has been described with reference to the exemplary embodiments thereof, the scope of the application is not intended to be limited to the specific form set forth herein. Rather, the application is meant to cover all alternatives, modifications, and equivalents arising from the process and the teachings of the application. Accordingly, the application is intended to embrace all such alterations, modifications, and changes.

[0055] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application, and although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and all should be included in the scope of the claims of the present application.

Claims

1. A storage-based heating system adapted to electricity spot trading, comprising a unit module (100), characterized in that: It also includes, The primary heating module (200) includes a condenser (201) and a condensate pump (202). The secondary heating module (300) includes a heating return water pipe (301), a heating drain pipe (302), an electric heating pump (303), a low-pressure cylinder (102), a drain pipe, and a plant circuit (305). A thermal storage module (400) includes a hot water storage tank (402); The heating return water pipe (301) has two paths, one path is connected to the condenser (201), and the other path is connected to the heating drain pipe (302). The heating drain pipe (302) is connected to the condenser (201) and also to the electric heating pump (303). The electric heating pump (303) is connected to the hot water storage tank (402). The unit module (100) includes an intermediate pressure cylinder (101), a low pressure cylinder (102), a generator (103), and a steam supply pipeline (104). The intermediate pressure cylinder (101), the low pressure cylinder (102), and the generator (103) are coaxially arranged, and the intermediate pressure cylinder (101) and the low pressure cylinder (102) are connected through the steam supply pipeline (104). The exhaust end of the low-pressure cylinder (102) is connected to the input end of the condenser (201), the output end of the condenser (201) is connected to the condensate pump (202), and the output end of the condensate pump (202) is connected to the condensate discharge pipe (203). The heating return water pipe (301) is connected to the external heating return water. The path 1 of the heating return water pipe (301) is input into the condenser (201). The heating return water is discharged to the heating drain pipe (302) after being heated. The path 2 of the heating return water pipe (301) is connected to the heating drain pipe (302). The electric heating pump (303) has a cold side and a hot side. The hot side has two heaters. One heater is driven by an external factory circuit (305), and the other heater is driven by a drain pipe of a low-pressure cylinder (102).

2. The energy storage heating system adapted to electricity spot trading as described in claim 1, characterized in that: The input end of the drain pipe of the low-pressure cylinder (102) is connected to the exhaust steam of the low-pressure cylinder (102), the output end of the drain pipe of the low-pressure cylinder (102) is connected to the hot side of the electric heating pump (303), and the hot side output end of the electric heating pump (303) is connected to the condensate pump (202).

3. The energy storage heating system adapted to electricity spot trading as described in claim 2, characterized in that: The heating drainage pipe (302) is also divided into two paths: one path directly discharges to the outside, and the other path connects to the cold side of the electric heating pump (303).

4. The energy storage heating system adapted to electricity spot trading as described in claim 3, characterized in that: The heat storage module (400) also includes a water supply pipeline (401) and a heating pipeline (403). The water supply pipeline (401) is connected to the input end of the hot water storage tank (402), and the heating pipeline (403) is connected to the external heating water supply.

5. The energy storage heating system adapted to electricity spot trading as described in claim 4, characterized in that: The heating return water pipe (301) is equipped with a second regulating valve (301a), a second check valve (301b), a third regulating valve (301c), and a third isolation valve (301d).

6. The energy storage heating system adapted to electricity spot trading as described in claim 5, characterized in that: The low-pressure cylinder (102) is equipped with a first check valve (304a), a first regulating valve (304b), and a first isolation valve (304c) on its drain pipe.

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