A calcium-based electrochemical fixed-bed heat storage system

Abstract

The present invention relates to a calcium-based electrochemical fixed bed heat storage system, which includes a water collector, a water distributor, a condenser, a condensate tank, a steam generator, an electrochemical heat storage module, a hot water storage water circulation pump, a cooling water circulation pump, a condensate pump, a water supply pump, a steam regulating valve, a return water regulating valve, a return water shut-off valve, a return water bypass valve, a return water switching valve, a return water pump front shut-off valve, a condensate pump front shut-off valve and a steam main pipe regulating valve. During the charging process, the heat storage module is heated to generate water vapor, and the generated water vapor enters the condensation system for cooling. The heat generated during the cooling process is supplied to users, and the cooling water is stored; during the energy release process, the system generates water vapor that enters the heat storage module for reaction, generates a large amount of heat, and the generated heat is absorbed by the system's water supply and return system for use by users.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a calcium-based electrochemical fixed bed heat storage system, which stores valley electricity as electrochemical energy to meet users' heat needs for hot water, thermal oil or other heat transfer media. Background Art

[0002] Since the 21st century, the development trend of electrification and intelligence has become increasingly obvious, and the social electricity demand has also increased year by year. In addition, due to the increasing proportion of renewable energy, the peak-valley load difference of the power grid has become increasingly serious. In order to improve the stability of the power grid and maintain the balance of the power system, it is necessary to take corresponding peak-shaving measures during the operation of the power grid. Conventional peak-shaving methods include peak-shaving of thermal power units, pumped energy storage, compressed air energy storage, solid heat storage and battery energy storage, but their application scenarios are all subject to certain limitations. The calcium-based electrochemical fixed bed heat storage system is mainly aimed at the user end, and while shaving the peak and filling the valley of electricity, it provides cheaper and more efficient energy for users. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a calcium-based electrochemical fixed bed heat storage system, which converts electricity into heat, stores and releases heat to meet the user's heat needs; when charging with low-valley electricity, the water vapor heat produced as a by-product of charging can be effectively utilized; when releasing energy, the heat released by the heat storage device can be efficiently absorbed, thereby achieving the purpose of heat storage.

[0004] The object of the present invention is achieved in that:

[0005] A calcium-based electrochemical fixed bed heat storage system, comprising a heat exchange system, a water discharge system, a condensation system and a steam system consisting of a water collector, a water distributor, a condenser, a condensate tank, a steam generator and a plurality of electrochemical heat storage modules; in the heat exchange system, the water distributor is connected to the electrochemical heat storage modules through a water supply pipe, a hot water storage water circulation pump is provided between the water distributor and the electrochemical heat storage module, a cooling water pump front shut-off valve is provided between the water distributor and the hot water storage circulation pump, a return water regulating valve and a return water shut-off valve are provided between the electrochemical heat storage module and the hot water storage circulation pump, the return water regulating valve is close to the electrochemical heat storage module, and the return water shut-off valve is close to the hot water storage circulation pump; the water collector is connected to the electrochemical heat storage modules through a return water pipe;

[0006] In the water discharge system, the water collector is connected to the hot water storage circulation pump through a water supply pipe, a return water switching valve is provided between the water collector and the hot water storage circulation pump, the hot water storage circulation pump is connected to the electrochemical heat storage module through a water supply branch and a return water regulating valve, and a return water bypass valve is provided on the water supply branch;

[0007] In the condensing system, the condenser is connected to the electrochemical heat storage module through a condensing pipe, the electrochemical heat storage module is powered on, and the condenser is also connected to three branches, one of which is connected to the condensing water tank through a condensing water pump, one is connected to the water collector through a return pipe, and the other is connected to the water distributor through a cooling water circulation pump. A cooling water pump front shut-off valve is provided between the cooling water circulation pump and the water distributor;

[0008] In the steam system, the steam generator is connected to the electrochemical heat storage module through a steam pipe. A steam regulating valve and a steam main pipe regulating valve are provided between the electrochemical heat storage module and the steam generator. The steam regulating valve is close to the electrochemical heat storage module, and the steam main pipe regulating valve is close to the steam generator. The steam generator is connected to the condensate tank through a feed water pump.

[0009] Furthermore, when the system releases energy and exchanges heat, the electrochemical heat storage module generates heat. At this time, the return water shut-off valve and the shut-off valve before the return water pump are opened, and the return water bypass valve and the return water switching valve are closed; a hot water storage water circulation pump is used to send water in the water distributor into the electrochemical heat storage module to absorb heat, and then enters the water collector. The opening of the return water regulating valve is adjusted according to the energy release of the heat storage module.

[0010] Furthermore, before the system is charged, the return water shut-off valve and the shut-off valve before the return water pump are closed, and the return water regulating valve, the return water bypass valve and the return water switching valve are opened; a hot water storage water circulation pump is used to send all the water in the electrochemical heat storage module and the supply and return water pipes into the water collector.

[0011] Furthermore, when the system is charged, the electrochemical heat storage module is powered on for heating, and the generated water vapor enters the condenser through the condenser pipe for condensation, and the condensed water is transported to the condensate tank through the condensate pump; the shut-off valve in front of the condensate pump is opened, and the water in the water distributor is transported to the condenser through the condensate pump, and is sent to the water collector after absorbing the steam condensation heat.

[0012] Furthermore, when steam is generated, the water in the condensate tank is pressurized by the feed water pump and sent to the steam generator to produce steam. The generated steam is regulated by the steam main pipe regulating valve and the steam regulating valve, and then sent to the electrochemical heat storage module to generate heat.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) High system heat storage efficiency: The present invention uses the waste heat of the charging steam to heat the water in the water distribution tank for external supply, thereby achieving the purpose of efficient utilization of the system waste heat.

[0015] (2) High energy release temperature: The heat storage device of the present invention uses calcium oxide / calcium hydroxide as the heat storage material, and its energy release and heat release temperature is in the range of 150~500℃, which can effectively meet the user's high temperature heat needs.

[0016] (3) Good system scalability: The heat storage unit of the present invention is modularly designed, and can be easily connected to form a module through the interface. The patented system fully considers the increase or decrease of heat storage modules, and can easily adapt to the increase of heat storage capacity by adding parallel pumps and valves. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the overall system principle diagram of the present invention.

[0018] Figure 2 This is a diagram of the steam generation system of the present invention.

[0019] Figure 3 This is a diagram of the energy release and heat exchange system of the present invention.

[0020] Figure 4 This is a diagram of the energy charging and water discharging system of the present invention.

[0021] Figure 5 This is a diagram of the charging condensation system of the present invention.

[0022] in:

[0023] Water collector S1, water distributor S2, condenser S3, condensate tank S4, steam generator S5, electrochemical heat storage module S6, hot water storage water circulation pump B1, cooling water circulation pump B2, condensate pump B3, feed water pump B4, steam regulating valve F1, return water regulating valve F2, return water shut-off valve F3, return water bypass valve F4, return water switching valve F5, return water pump front shut-off valve F6, cooling water pump front shut-off valve F7, steam main pipe regulating valve F8. DETAILED DESCRIPTION

[0024] Embodiment 1:

[0025] See also Figure 1 The present invention relates to a calcium-based electrochemical fixed bed heat storage system, which includes a heat exchange system consisting of a water collector S1, a water distributor S2, a condenser S3, a condensate tank S4, a steam generator S5 and a plurality of electrochemical heat storage modules S6, a water discharge system, a condensation system and a steam system.

[0026] In the heat exchange system, the water distributor S2 is connected to the electrochemical heat storage module S6 through a water supply pipe, a hot water storage circulation pump B1 is provided between the water distributor S2 and the electrochemical heat storage module S6, a cooling water pump front shut-off valve F7 is provided between the water distributor S2 and the hot water storage circulation pump B1, a return water regulating valve F2 and a return water shut-off valve F3 are provided between the electrochemical heat storage module S6 and the hot water storage circulation pump B1, the return water regulating valve F2 is close to the electrochemical heat storage module S6, and the return water shut-off valve F3 is close to the hot water storage circulation pump B1; the water collector S1 is connected to the electrochemical heat storage module S6 through a return water pipe;

[0027] See also Figure 3 When the system releases energy and exchanges heat, the electrochemical heat storage module S6 generates heat. At this time, the return water shut-off valve F3 and the return water pump front shut-off valve F6 are opened, and the return water bypass valve F4 and the return water switching valve F5 are closed; the water in the water distributor S2 is sent to the electrochemical heat storage module S6 by the hot water storage water circulation pump B1 to absorb heat, and then enter the water collector S1. The opening of the return water regulating valve F2 is adjusted according to the energy release of the heat storage module.

[0028] In the water discharge system, the water collector S1 is connected to the hot water storage circulation pump B1 through a water supply pipe, a return water switching valve F5 is provided between the water collector S1 and the hot water storage circulation pump B1, the hot water storage circulation pump B1 is connected to the electrochemical heat storage module S6 through a water supply branch line via a return water regulating valve F2, and a return water bypass valve F4 is provided on the water supply branch line;

[0029] See also Figure 4 Before the system is charged, the return water shut-off valve F3 and the return water pump front shut-off valve F6 are closed, and the return water regulating valve F2, the return water bypass valve F4 and the return water switching valve F5 are opened; the hot water storage water circulation pump B1 is used to send all the water in the electrochemical heat storage module S6 and the supply and return water pipes into the water collector S1.

[0030] In the condensing system, the condenser S3 is connected to the electrochemical heat storage module S6 through the condensing pipe, the electrochemical heat storage module S6 is powered, and the condenser S3 is also connected to three branches, one of which is connected to the condensing water tank S4 through the condensing water pump B3, one is connected to the water collector S1 through the return pipe, and the other is connected to the water distributor S2 through the cooling water circulation pump B2. A cooling water pump front shut-off valve F7 is provided between the cooling water circulation pump B2 and the water distributor S2;

[0031] See also Figure 5 When the system is charged, the electrochemical heat storage module S6 is powered on for heating, and the generated water vapor enters the condenser S3 through the condenser pipe for condensation, and the condensed water is transported to the condensate tank S4 through the condensate pump B3; the shut-off valve F7 before the condensate pump is opened, and the water in the water distributor S2 is transported to the condenser S3 through the condensate pump B3, and is sent to the water collector S1 after absorbing the steam condensation heat.

[0032] In the steam system, the steam generator S5 is connected to the electrochemical heat storage module S6 through a steam pipe. A steam regulating valve F1 and a steam main pipe regulating valve F8 are provided between the electrochemical heat storage module S6 and the steam generator S5. The steam regulating valve F1 is close to the electrochemical heat storage module S6, and the steam main pipe regulating valve F8 is close to the steam generator S5. The steam generator S5 is connected to the condensate tank S4 through a feed water pump B4.

[0033] See also Figure 2When steam is generated, the water in the condensate tank S4 is pressurized by the feed water pump B4 and sent to the steam generator S5 to produce steam. The generated steam is regulated by the steam main pipe regulating valve F8 and the steam regulating valve F1, and then sent to the electrochemical heat storage module S6 to generate heat.

[0034] Working principle:

[0035] The present invention includes a water collector, a water distributor, a condenser, a condensate tank, a steam generator, an electrochemical heat storage module, a hot water storage water circulation pump, a cooling water circulation pump, a condensate pump, a water supply pump, a steam regulating valve, a return water regulating valve, a return water shut-off valve, a return water bypass valve, a return water switching valve, a return water pump front shut-off valve, a condensate pump front shut-off valve and a steam main pipe regulating valve. During the charging process, the heat storage module is heated to generate water vapor, and the generated water vapor enters the condensation system for cooling. The heat generated during the cooling process is supplied to the user, and the cooling water is stored; during the energy release process, the system generates water vapor that enters the heat storage module for reaction, generates a large amount of heat, and the generated heat is absorbed by the system's water supply and return system for use by the user.

[0036] The fixed bed heat storage device of the present invention is modular, converting electricity into chemical energy at night and releasing the chemical energy into heat during the day. A single heat storage module can store heat, and can also be combined to form a heat storage module to cope with different heat usage scenarios. When storing energy, electricity is converted into chemical energy in the heat storage device, and the water vapor generated during this period enters the condenser for condensation, and the condensed water is transported to the condensation water tank through a water pump; when releasing energy, the water in the condensation water tank enters the steam generator through a water pump to generate water vapor, and the water vapor enters the heat storage device to release energy, and the generated heat is carried away by the water from the water distributor and sent to the water collector.

[0037] The above are only specific application examples of the present invention and do not constitute any limitation on the protection scope of the present invention. Any technical solution formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the present invention.

Claims

1. A calcium-based electrochemical fixed bed heat storage system, characterized in that: It comprises a heat exchange system, a water discharge system, a condensation system and a steam system, which are composed of a water collector (S1), a water distributor (S2), a condenser (S3), a condensate tank (S4), a steam generator (S5) and an electrochemical heat storage module (S6); in the heat exchange system, the water distributor (S2) is connected to the electrochemical heat storage module (S6) through a water supply pipe, a hot water storage circulation pump (B1) is provided between the water distributor (S2) and the electrochemical heat storage module (S6), a cooling water pump front shut-off valve (F7) is provided between the water distributor (S2) and the hot water storage circulation pump (B1), a return water regulating valve (F2) and a return water shut-off valve (F3) are provided between the electrochemical heat storage module (S6) and the hot water storage circulation pump (B1), the return water regulating valve (F2) is close to the electrochemical heat storage module (S6), and the return water shut-off valve (F3) is close to the hot water storage circulation pump (B1); the water collector (S1) is connected to the electrochemical heat storage module (S6) through the return water pipe; In the water discharge system, the water collector (S1) is connected to the hot water storage circulation pump (B1) through a water supply pipe, a return water switching valve (F5) is provided between the water collector (S1) and the hot water storage circulation pump (B1), the hot water storage circulation pump (B1) is connected to the electrochemical heat storage module (S6) through a water supply branch line and a return water regulating valve (F2), and a return water bypass valve (F4) is provided on the water supply branch line; In the condensation system, the condenser (S3) is connected to the electrochemical heat storage module (S6) through a condensation pipe, and the condenser (S3) is also connected to three branches, one of which is connected to the condensation water tank (S4) through a condensation water pump (B3), one is connected to the water collector (S1) through a return pipe, and the other is connected to the water distributor (S2) through a cooling water circulation pump (B2), and a cooling water pump front shut-off valve (F7) is provided between the cooling water circulation pump (B2) and the water distributor (S2); In the steam system, a steam generator (S5) is connected to the electrochemical heat storage module (S6) through a steam pipe, and a steam regulating valve (F1) and a steam main pipe regulating valve (F8) are provided between the electrochemical heat storage module (S6) and the steam generator (S5), the steam regulating valve (F1) is close to the electrochemical heat storage module (S6), and the steam main pipe regulating valve (F8) is close to the steam generator (S5); the steam generator (S5) is connected to the condensate tank (S4) through a feed water pump (B4).

2. A calcium-based electrochemical fixed bed heat storage system according to claim 1, characterized in that: When the system releases energy and exchanges heat, the electrochemical heat storage module (S6) generates heat. At this time, the return water shut-off valve (F3) and the shut-off valve before the return water pump (F6) are opened, and the return water bypass valve (F4) and the return water switching valve (F5) are closed; the water in the water distributor (S2) is sent to the electrochemical heat storage module (S6) by the hot water storage water circulation pump (B1) to absorb heat, and then enter the water collector (S1), and the opening of the return water regulating valve (F2) is adjusted according to the energy release of the heat storage module.

3. The calcium-based electrochemical fixed bed heat storage system according to claim 1, characterized in that: Before the system is charged, the return water shut-off valve (F3) and the shut-off valve before the return water pump (F6) are closed, and the return water regulating valve (F2), the return water bypass valve (F4) and the return water switching valve (F5) are opened; the water storage water circulation pump (B1) is used to send all the water in the electrochemical heat storage module (S6) and the supply and return water pipes into the water collector (S1).

4. The calcium-based electrochemical fixed bed heat storage system according to claim 1, characterized in that: When the system is charged, the electrochemical heat storage module (S6) is powered on for heating, and the generated water vapor enters the condenser (S3) through the condenser pipe to condense, and the condensed water is transported to the condensate tank (S4) through the condensate pump (B3); the shut-off valve in front of the condensate pump is opened, and the water in the water distributor (S2) is transported to the condenser (S3) through the condensate pump (B3), and is sent to the water collector (S1) after absorbing the steam condensation heat.

5. The calcium-based electrochemical fixed bed heat storage system according to claim 1, characterized in that: When steam is generated, the water in the condensate tank (S4) is pressurized by the feed water pump (B4) and sent to the steam generator (S5) to produce steam. The generated steam is regulated by the steam main pipe regulating valve (F8) and the steam regulating valve (F1) and then sent to the electrochemical heat storage module (S6) to generate heat.

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