Fused salt energy storage temperature and pressure reduction device

Abstract

The utility model discloses a fused salt energy storage temperature and pressure reduction device which comprises a heat storage tank filled with phase change materials. The energy supply system comprises a steam pipeline arranged in the heat storage tank; the heat exchange system comprises a heat exchange water pipe arranged in the heat storage tank, the water inlet end of the heat exchange water pipe penetrates through the bottom wall of the heat storage tank and extends out of the heat storage tank, and the water outlet end of the heat exchange water pipe penetrates through the bottom wall of the heat storage tank and extends out of the heat storage tank; the temperature and pressure reducing system comprises a temperature and pressure reducing pipe, one end of the temperature and pressure reducing pipe is detachably communicated with the outlet end of the steam pipeline, and a temperature reducing unit and a pressure reducing unit are arranged on the temperature and pressure reducing pipe; and the monitoring unit is mounted in the heat storage tank. The phase-change material heat storage and temperature and pressure reduction system is combined to improve the steam pressure and temperature management capability of the temperature and pressure reduction system, so that the effective storage and utilization of energy are realized, and the waste of steam heat energy is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal energy engineering or energy utilization, in particular to a molten salt energy storage temperature and pressure reduction device. Background Art

[0002] As the core equipment for thermal energy storage and utilization, heat storage devices have been a hot topic in the field of scientific research in recent years. With the rapid development of renewable energy and the growing demand for electricity, the research and application of heat storage devices have become particularly important. At present, the research on heat storage devices mainly focuses on improving their heat storage efficiency, enhancing the quality of thermal energy, and optimizing the structural design of the device.

[0003] As a key thermal energy control device in the heat storage device, the performance of the desuperheater is directly related to the energy utilization efficiency and system stability. At present, domestic desuperheater and decompression devices have gradually established a design, research and development, and production system based on the introduction of foreign technology. However, compared with foreign advanced technologies, they still have shortcomings such as short life, low efficiency, complex structure, and unstable performance. At the same time, large thermodynamic losses are also a major problem facing the current desuperheater and decompression devices. During the desuperheating and decompression process, the imperfections in heat energy transfer and conversion lead to a large amount of heat loss and energy conversion loss. This not only reduces energy utilization efficiency and increases power generation costs, but may also pose a threat to the stable operation of thermal power generation systems.

[0004] Based on the above reasons, the utility model provides a molten salt energy storage temperature and pressure reduction device. Utility Model Content

[0005] The utility model aims to provide a molten salt energy storage temperature and pressure reduction device to solve the problems existing in the prior art.

[0006] To achieve the above purpose, the utility model provides the following solution: The utility model provides a molten salt energy storage temperature and pressure reduction device, comprising:

[0007] A heat storage tank filled with a phase change material;

[0008] An energy supply system, the energy supply system comprising a steam pipe arranged in the heat storage tank, an air inlet end of the steam pipe passing through the top wall of the heat storage tank and extending out of the heat storage tank, and an outlet end of the steam pipe passing through the bottom wall of the heat storage tank and extending out of the heat storage tank;

[0009] A heat exchange system, the heat exchange system comprising a heat exchange water pipe arranged in the heat storage tank, a water inlet end of the heat exchange water pipe passing through the bottom wall of the heat storage tank and extending out of the heat storage tank, and a water outlet end of the heat exchange water pipe passing through the bottom wall of the heat storage tank and extending out of the heat storage tank;

[0010] A temperature reduction and pressure reduction system, wherein the temperature reduction and pressure reduction system comprises a temperature reduction and pressure reduction pipe, one end of which is detachably connected to the outlet end of the steam pipeline, and a temperature reduction unit and a pressure reduction unit are provided on the temperature reduction and pressure reduction pipe;

[0011] A monitoring unit is installed in the heat storage tank.

[0012] According to the molten salt energy storage cooling and pressure reduction device provided by the utility model, the cooling unit includes an atomizing water spraying device installed at the end of the cooling and pressure reduction pipe, a mixing valve is installed at the end of the cooling and pressure reduction pipe, and the atomizing water spraying device is arranged between the mixing valve and the outlet end of the steam pipe.

[0013] According to the molten salt energy storage temperature and pressure reduction device provided by the utility model, the pressure reduction unit includes a throttling orifice plate, and the throttling orifice plate is installed in the middle part of the steam pipe.

[0014] According to the molten salt energy storage temperature and pressure reduction device provided by the utility model, the monitoring unit includes a pressure sensor and a temperature sensor, and the pressure sensor and the temperature sensor are both installed in the heat storage tank.

[0015] According to the molten salt energy storage temperature and pressure reduction device provided by the utility model, a temperature sensor and a flow regulator are installed at the water inlet end of the hot water exchange pipe.

[0016] According to the molten salt energy storage temperature and pressure reduction device provided by the utility model, a flow control valve is installed at the outlet end of the steam pipeline.

[0017] According to the molten salt energy storage temperature and pressure reduction device provided by the utility model, a filter is installed in the outlet end of the steam pipeline.

[0018] According to the molten salt energy storage temperature and pressure reduction device provided by the utility model, the inner wall of the heat storage tank is paved with a stainless steel galvanized lining.

[0019] The utility model discloses the following technical effects:

[0020] When the utility model is working, hot steam enters the steam pipe through the air inlet end of the steam pipe, flows through a cycle in the steam pipe, and finally flows out from the outlet end of the steam pipe. In this process, the heat carried by the hot steam is released to cause the phase change material to undergo a phase change. Then, cooling water enters the hot water exchange pipe through the water inlet end of the hot water exchange pipe, and also flows through the water outlet end of the hot water exchange pipe after flowing through a cycle to enter the heat recovery system. The hot steam that has released part of its heat enters the temperature reduction and pressure reduction pipe, and under the action of the temperature reduction unit and the pressure reduction unit, the high-temperature and high-pressure steam is converted into low-temperature and low-pressure steam that meets specific needs, and finally flows out, thereby meeting the needs of industrial steam or heating steam.

[0021] This new method combines phase change material heat storage with a temperature reduction and pressure reduction system to improve the temperature reduction and pressure reduction system's ability to manage steam pressure and temperature, thereby achieving effective energy storage and utilization and reducing the waste of steam thermal energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of the structure of the molten salt energy storage and temperature reduction and pressure reduction device of the utility model;

[0024] Figure 2 It is a structural schematic diagram of the temperature and pressure reduction system of the utility model.

[0025] Among them, 1. heat storage tank; 2. steam pipe; 3. hot water exchange pipe; 4. temperature and pressure reduction pipe; 5. mixing valve; 6. atomizing water spray device; 7. throttling orifice plate. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0027] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] Reference Figure 1-2 The utility model provides a molten salt energy storage temperature and pressure reduction device, comprising:

[0029] A heat storage tank 1, wherein the heat storage tank 1 is filled with a phase change material;

[0030] In this embodiment, the phase change material is selected as molten salt, and the molten salt composition is a binary nitrate composed of 60% NaNO3 and 40% KNO3. The melting point and operating temperature range of the molten salt should be set according to the actual operating conditions to ensure that the molten salt is always in a liquid state, which is convenient for the storage and transfer of heat energy. In this embodiment, the operating temperature range of the molten salt is between 400-550°C, which can well meet the steam cooling requirements.

[0031] Molten salt heat storage technology can achieve efficient energy storage, and its storage efficiency can usually reach more than 80%. This is mainly because molten salt can absorb a large amount of heat energy at high temperature and release it quickly when needed, which can well meet the needs of storing high-quality effective energy when high-temperature and high-pressure steam circulates. The molten salt materials used in molten salt heat storage technology are usually inorganic salts, such as nitrates, chlorides, etc. These materials have high stability and will not pollute the environment. At the same time, there is no emission of any harmful substances during the working process of molten salt heat storage technology, so it has the characteristics of environmental protection and safety. In addition, the operating temperature of molten salt heat storage technology is usually low, which can reduce operating risks and improve the safety of the system. The service life of molten salt heat storage technology is long, and its molten salt material is not easy to deteriorate and can operate stably for a long time. At the same time, the maintenance and replacement costs of molten salt heat storage technology are low, which reduces the cost of long-term use;

[0032] The energy supply system includes a steam pipe 2 arranged in the heat storage tank 1, an air inlet end of the steam pipe 2 passes through the top wall of the heat storage tank 1 and extends out of the heat storage tank 1, and an outlet end of the steam pipe 2 passes through the bottom wall of the heat storage tank 1 and extends out of the heat storage tank 1;

[0033] The heat exchange system includes a heat exchange water pipe 3 arranged in the heat storage tank 1, the water inlet end of the heat exchange water pipe 3 passes through the bottom wall of the heat storage tank 1 and extends out of the heat storage tank 1, and the water outlet end of the heat exchange water pipe 3 passes through the bottom wall of the heat storage tank 1 and extends out of the heat storage tank 1;

[0034] A temperature reduction and pressure reduction system, the temperature reduction and pressure reduction system comprises a temperature reduction and pressure reduction pipe 4, one end of the temperature reduction and pressure reduction pipe 4 is detachably connected to the outlet end of the steam pipe 2, and a temperature reduction unit and a pressure reduction unit are arranged on the temperature reduction and pressure reduction pipe 4;

[0035] Monitoring unit: The monitoring unit is installed in the heat storage tank 1.

[0036] When the utility model is working, hot steam enters the steam pipe 2 through the air inlet end of the steam pipe 2, flows through a cycle in the steam pipe 2, and finally flows out from the outlet end of the steam pipe 2. In this process, the heat carried by the hot steam is released to cause the phase change material to undergo a phase change. Then, cooling water enters the hot water exchange pipe 3 through the water inlet end of the hot water exchange pipe 3, and also flows through the water outlet end of the hot water exchange pipe 3 after flowing through a cycle to enter the heat recovery system. The hot steam that has released part of its heat enters the temperature reduction and pressure reduction pipe 4, and under the action of the temperature reduction unit and the pressure reduction unit, the high-temperature and high-pressure steam is converted into low-temperature and low-pressure steam that meets specific needs, and finally flows out, thereby meeting the needs of industrial steam or heating steam.

[0037] This new method combines phase change material heat storage with a temperature reduction and pressure reduction system to improve the temperature reduction and pressure reduction system's ability to manage steam pressure and temperature, thereby achieving effective energy storage and utilization and reducing the waste of steam thermal energy.

[0038] To further optimize the solution, the steam pipe 2 and the heat exchange pipe 3 are made of high-efficiency heat-conducting materials with excellent heat transfer performance and corrosion resistance. The steam pipe 2 is densely distributed in a straight line inside the heat storage tank 1, which increases the contact area between the steam and the molten salt and improves the heat exchange efficiency. The heat exchange pipe 3 fits tightly to the wall of the heat storage tank 1 to ensure that the cooling water can fully absorb the heat in the molten salt.

[0039] According to a further optimized solution, the temperature reduction unit includes an atomizing water spraying device 6 installed at the end of the temperature reduction and pressure reduction pipe 4, a mixing valve 5 is installed at the end of the temperature reduction and pressure reduction pipe 4, and the atomizing water spraying device 6 is arranged between the mixing valve 5 and the outlet end of the steam pipe 2. The atomizing water spraying device 6 adopts the existing technology.

[0040] According to a further optimized solution, the pressure reducing unit includes a throttling orifice plate 7 , which is installed in the middle part of the steam pipe 2 .

[0041] According to a further optimized solution, the monitoring unit includes a pressure sensor and a temperature sensor, and both the pressure sensor and the temperature sensor are installed in the heat storage tank 1.

[0042] To further optimize the solution, a temperature sensor and a flow regulator are installed at the water inlet end of the heat exchange pipe 3. The temperature sensor and the flow regulator can monitor and adjust the temperature and flow of the cooling water entering the heat storage tank 1 in real time to ensure the stability and efficiency of the heat exchange process.

[0043] To further optimize the solution, a flow control valve is installed at the outlet end of the steam pipe 2. The setting of the flow control valve can achieve precise control of the steam outflow rate.

[0044] According to a further optimization scheme, a filter is installed in the outlet end of the steam pipe 2.

[0045] To further optimize the solution, the inner wall of the heat storage tank 1 is paved with a stainless steel galvanized lining. The lining uses corrosion-resistant and high-temperature resistant austenitic stainless steel as the lining material of the heat storage tank 1. Stainless steel has excellent mechanical properties and chemical stability and can resist the corrosion of molten salt. In order to improve the corrosion resistance of the heat storage tank 1, the lining material is galvanized. The galvanized layer should be uniform, dense, without defects and peeling, to ensure long-term and stable anti-corrosion effect. The thickness of the galvanized layer should be set according to the corrosiveness and service life requirements of the molten salt to meet the reliability requirements of the system operation. According to factors such as the temperature, pressure and corrosiveness of the molten salt, the thickness of the lining material is accurately calculated. The lining should be thick enough to withstand the high temperature, high pressure and corrosion of the molten salt, while ensuring the safe operation of the system.

[0046] The outer wall of the heat storage tank 1 can be made of carbon steel plate, but it also needs to be galvanized to enhance its corrosion resistance. The galvanized outer wall should have good weather resistance and corrosion resistance, and can maintain stable performance in harsh environments.

[0047] Example:

[0048] Take the medium-temperature and medium-pressure boiler generator set as an example.

[0049] Table 1:

[0050]

[0051]

[0052] Among them, Table 1 shows boiler and steam related parameters;

[0053] System temperature for

[0054]

[0055] Where: Ex_T is the system temperature J; h_0 is the initial enthalpy of steam, h is the final enthalpy of steam, J; T_0 is the initial Kelvin temperature of steam, T is the final Kelvin temperature of steam, K; S_0 is the initial entropy of steam, S is the final entropy of steam, J / K; Cp is the specific heat at constant pressure, J / (kg·K).

[0056] System pressure for

[0057]

[0058] Where Ex_p is the system pressure J; v_0 is the initial specific volume of steam, v is the final specific volume of steam, m 3 / kg; p_0 is the initial steam pressure, p is the final steam pressure, pa; n is the number of moles of gas, mol; Rg is the molar gas constant, which is approximately 8.31JK^-1mol^-1.

[0059] The effective energy of the system when the temperature and pressure reduction system is set up alone without heat storage tank 1

[0060]

[0061] The effective energy of the system when the heat storage tank 1 and the temperature and pressure reduction system are set at the same time

[0062]

[0063] Where Rg is the molar gas constant, which is approximately 8.31JK^-1mol^-1, and Cp represents the specific heat capacity at constant pressure, which has different values ​​at different temperatures.

[0064] Balance formula

[0065] ∑E xin +W=∑x out +∑I i

[0066] Where ∑E xin The initial thermodynamics of the system J; W is the work done by the outside world on the system, J; ∑x out The final thermodynamics of the system J;∑I i for Loss, J.

[0067] In both cases the system The difference is

[0068]

[0069] Where ΔEx is the system The difference, J; E x，p For the system J. Calculate the two processes used With payment Ratio

[0070]

[0071] Where Efficiency, %, E x，u For the exploited E x，p For payment

[0072] After the overall improvement, the whole system Efficiency will increase by 6.74%.

[0073] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply 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 understood as a limitation on the present invention.

[0074] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A molten salt energy storage temperature and pressure reduction device, characterized in that: include: A heat storage tank (1), wherein the heat storage tank (1) is filled with a phase change material; An energy supply system, the energy supply system comprising a steam pipe (2) arranged in the heat storage tank (1), an air inlet end of the steam pipe (2) passing through the top wall of the heat storage tank (1) and extending out of the heat storage tank (1), and an outlet end of the steam pipe (2) passing through the bottom wall of the heat storage tank (1) and extending out of the heat storage tank (1); A heat exchange system, the heat exchange system comprising a heat exchange water pipe (3) arranged in the heat storage tank (1), the water inlet end of the heat exchange water pipe (3) passing through the bottom wall of the heat storage tank (1) and extending out of the heat storage tank (1), and the water outlet end of the heat exchange water pipe (3) passing through the bottom wall of the heat storage tank (1) and extending out of the heat storage tank (1); A temperature reduction and pressure reduction system, the temperature reduction and pressure reduction system comprising a temperature reduction and pressure reduction pipe (4), one end of the temperature reduction and pressure reduction pipe (4) being detachably connected to the outlet end of the steam pipeline (2), and a temperature reduction unit and a pressure reduction unit being provided on the temperature reduction and pressure reduction pipe (4); A monitoring unit, wherein the monitoring unit is installed in the heat storage tank (1).

2. A molten salt energy storage temperature and pressure reduction device according to claim 1, characterized in that: The cooling unit comprises an atomizing water spraying device (6) installed at the end of the cooling and pressure reducing pipe (4); a mixing valve (5) is installed at the end of the cooling and pressure reducing pipe (4); and the atomizing water spraying device (6) is arranged between the mixing valve (5) and the outlet end of the steam pipe (2).

3. A molten salt energy storage temperature and pressure reduction device according to claim 1, characterized in that: The pressure reducing unit comprises a throttling orifice plate (7), and the throttling orifice plate (7) is installed in the middle part of the steam pipe (2).

4. A molten salt energy storage temperature and pressure reduction device according to claim 1, characterized in that: The monitoring unit comprises a pressure sensor and a temperature sensor, and both the pressure sensor and the temperature sensor are installed in the heat storage tank (1).

5. The molten salt energy storage temperature and pressure reduction device according to claim 1, characterized in that: The water inlet end of the hot water exchange pipe (3) is equipped with a temperature sensor and a flow regulator.

6. A molten salt energy storage temperature and pressure reduction device according to claim 1, characterized in that: A flow control valve is installed at the outlet end of the steam pipeline (2).

7. The molten salt energy storage temperature and pressure reduction device according to claim 1, characterized in that: A filter is installed in the outlet end of the steam pipe (2).

8. The molten salt energy storage temperature and pressure reduction device according to claim 1, characterized in that: The inner wall of the heat storage tank (1) is paved with a stainless steel galvanized lining.

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