A control method of an energy cascade utilization system

Abstract

A control method of an energy cascade utilization system, comprising: passing molten salt flowing out of a molten salt outlet of a high-temperature molten salt storage area into a high-temperature pyrolysis area, and pyrolyzing organic solid waste in the high-temperature pyrolysis area by using heat of the molten salt in the high-temperature pyrolysis area; passing molten salt flowing out of a molten salt outlet of the high-temperature pyrolysis area into a medium-temperature drying area, and drying sludge in the medium-temperature drying area by using heat of the molten salt in the medium-temperature drying area; passing molten salt flowing out of a molten salt outlet of the medium-temperature drying area into a low-temperature heating area, and heating a terminal in the low-temperature heating area by using heat of the molten salt in the low-temperature heating area; heating molten salt flowing out of a molten salt outlet of the low-temperature heating area, and storing the heated molten salt in the high-temperature molten salt storage area. The design can realize cascade utilization of different grade heat energy on the load side.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage and energy utilization, and in particular to a control method of an energy cascade utilization system. BACKGROUND

[0002] Under the "double carbon" goal, the large-scale on-grid of clean energy will exacerbate the risk of safe operation of the power grid. In order to cope with the corresponding risk of safe operation of the power grid, it is urgent to promote the development and application of energy storage technology.

[0003] In recent years, the energy storage technology of molten salt energy storage system has developed rapidly. On the power generation side, the molten salt energy storage technology has been successfully commercialized. However, on the load side, the molten salt energy storage technology has not been widely used. Developing stable and efficient "energy storage-energy release" technology is conducive to helping the load side to significantly reduce carbon emissions and promoting green and low-carbon energy transformation. For different grade heat energy on the load side, establishing a cascade utilization method corresponding to different grade heat energy and forming a unified collaborative utilization mode have become a research hotspot of "energy storage-energy release" technology on the load side. However, the system and control method of energy cascade utilization are still lacking. Therefore, there is an urgent need for a system control method of energy cascade utilization based on molten salt energy storage technology to solve the above problems. SUMMARY

[0004] The purpose of the present application is to overcome the problems of lack of stable "energy storage-energy release" technology on the load side and lack of cascade utilization method corresponding to different grade heat energy in the prior art, and to provide a control method of an energy cascade utilization system.

[0005] To achieve the above purpose, the technical solution of the present application is:

[0006] A control method of an energy cascade utilization system, the energy cascade utilization system comprising: a high-temperature molten salt storage area, a high-temperature pyrolysis area, a medium-temperature drying area, a low-temperature heat supply area and an electric heating device, the molten salt flow outlet of the high-temperature molten salt storage area being in communication with the molten salt flow inlet of the high-temperature pyrolysis area, the molten salt flow outlet of the high-temperature pyrolysis area being in communication with the molten salt flow inlet of the medium-temperature drying area, the molten salt flow outlet of the medium-temperature drying area being in communication with the molten salt flow inlet of the low-temperature heat supply area, and the molten salt flow outlet of the low-temperature heat supply area being in communication with the molten salt flow inlet of the high-temperature molten salt storage area.

[0007] The control method comprises:

[0008] The molten salt flowing out of the molten salt flow outlet of the high-temperature molten salt storage area 1 is introduced into the high-temperature pyrolysis area, and the heat of the molten salt in the high-temperature pyrolysis area is used to pyrolyze the organic solid waste in the high-temperature pyrolysis area.

[0009] The molten salt flowing out of the molten salt flow outlet of the high-temperature pyrolysis zone is introduced into the medium-temperature drying zone, and the heat of the molten salt in the medium-temperature drying zone is used to dry the sludge in the medium-temperature drying zone.

[0010] The molten salt flowing out of the molten salt flow outlet of the medium-temperature drying zone is introduced into the low-temperature heating zone, and the heat of the molten salt in the low-temperature heating zone is used to heat the terminal in the low-temperature heating zone.

[0011] The molten salt flowing out of the molten salt flow outlet of the low-temperature heating zone is heated, and the heated molten salt is introduced into the high-temperature molten salt storage zone for storage.

[0012] The temperature of the molten salt in the high-temperature pyrolysis zone is 450-550°C, the temperature of the molten salt in the medium-temperature drying zone is 300-400°C, and the temperature of the molten salt in the low-temperature heating zone is 200-250°C.

[0013] The energy cascade utilization system further comprises an electric heating device, which uses valley electricity to heat the molten salt flowing out of the molten salt flow outlet of the low-temperature heating zone.

[0014] The molten salt flow inlet of the low-temperature heating zone is connected to the molten salt flow outlet of the high-temperature pyrolysis zone.

[0015] The control method further comprises:

[0016] The molten salt flowing out of the molten salt flow outlet of the high-temperature pyrolysis zone is introduced into the low-temperature heating zone, and the heat of the molten salt in the low-temperature heating zone is used to heat the terminal in the low-temperature heating zone.

[0017] The energy cascade utilization system further comprises a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, and a fifth pipeline. The molten salt flow outlet of the high-temperature molten salt storage zone is connected to the molten salt flow inlet of the high-temperature pyrolysis zone through the first pipeline. The molten salt flow outlet of the high-temperature pyrolysis zone is connected to the molten salt flow inlet of the medium-temperature drying zone through the second pipeline. The molten salt flow outlet of the medium-temperature drying zone is connected to the molten salt flow inlet of the low-temperature heating zone through the third pipeline. The molten salt flow inlet of the low-temperature heating zone is connected to the molten salt flow outlet of the high-temperature pyrolysis zone through the fourth pipeline. The molten salt flow outlet of the low-temperature heating zone is connected to the molten salt flow inlet of the high-temperature molten salt storage zone through the fifth pipeline. An electric heating device is arranged on the fifth pipeline.

[0018] The electric heating device heats the molten salt in the fifth pipeline.

[0019] A circulating pump is arranged on each of the first pipeline, the second pipeline, the third pipeline, the fourth pipeline, and the fifth pipeline, and the circulating pump is used to transport the molten salt.

[0020] A first flow regulating valve is arranged on the first pipeline, and the first flow regulating valve is used to regulate the flow of the molten salt in the first pipeline.

[0021] The second pipeline is provided with a second flow regulating valve for regulating the flow of molten salt in the second pipeline.

[0022] The third pipeline is provided with a third flow regulating valve for regulating the flow of molten salt in the third pipeline.

[0023] The fourth pipeline is provided with a fourth flow regulating valve for regulating the flow of molten salt in the fourth pipeline.

[0024] The first pipeline is provided with a first flow detection unit for detecting the flow of molten salt in the first pipeline.

[0025] The second pipeline is provided with a second flow detection unit for detecting the flow of molten salt in the second pipeline.

[0026] The third pipeline is provided with a third flow detection unit for detecting the flow of molten salt in the third pipeline.

[0027] The fourth pipeline is provided with a fourth flow detection unit for detecting the flow of molten salt in the fourth pipeline.

[0028] The first flow detection unit comprises a first detection pipeline, a second detection pipeline and a third detection pipeline connected in sequence, the inner diameter of the first detection pipeline and the inner diameter of the third detection pipeline are the same, and the inner diameter of the second detection pipeline is smaller than the inner diameters of the first detection pipeline and the third detection pipeline.

[0029] A first pressure sensor is arranged on the outer wall of the first detection pipeline or the third detection pipeline, and a second pressure sensor and a temperature sensor are arranged on the outer wall of the second detection pipeline.

[0030] The structures of the second flow detection unit, the third flow detection unit and the fourth flow detection unit are the same as that of the first flow detection unit.

[0031] The first flow detection unit detects the flow of molten salt in the first pipeline, specifically comprising:

[0032] Step one, obtain the current density p of molten salt in the first flow detection unit, obtain the first current pressure p1 through the first pressure sensor, and obtain the second current pressure p2 through the second pressure sensor.

[0033] Step two, calculate the first flow rate v1 and the second flow rate v2 according to formula (1):

[0034]

[0035] In formula (1), d1 is the inner diameter of the first detection pipeline or the third detection pipeline, and d2 is the inner diameter of the second detection pipeline;

[0036] Step three, calculate the flow according to formula (2) or (3):

[0037]

[0038]

[0039] In formula (2) and formula (3), Q is the current flow of the molten salt in the first pipeline;

[0040] The method for detecting the flow of the molten salt in the second pipeline by the second flow regulating valve, the flow of the molten salt in the third pipeline by the third flow regulating valve and the flow of the molten salt in the fourth pipeline by the fourth flow detection unit is the same as the method for detecting the flow of the molten salt in the first pipeline by the first flow detection unit.

[0041] In step one, the current density p of the molten salt in the first flow detection unit is specifically obtained by:

[0042] A preset database is set, and the preset database stores the density of the molten salt at different temperatures;

[0043] The current temperature T of the molten salt in the first flow detection unit is obtained by a temperature sensor, and the current density p of the molten salt in the first flow detection unit is obtained according to the current temperature T of the molten salt and the preset database.

[0044] Compared with the prior art, the present application has the following advantages:

[0045] 1、the control method of the energy cascade utilization system, the high-temperature molten salt flows through the high-temperature pyrolysis zone, the medium-temperature drying zone and the low-temperature heating zone in turn after flowing out of the high-temperature molten salt storage area, and the organic solid waste in the high-temperature pyrolysis zone is pyrolyzed, the sludge in the medium-temperature drying zone is dried, and the terminal in the low-temperature heating zone is heated in turn, realizing cascade utilization of different grade heat energy, and the heat energy utilization rate is high.

[0046] 2、The energy cascade utilization system control method of the application, the energy cascade utilization system is arranged at the load side of the power grid, the high-temperature molten salt flows through the high-temperature pyrolysis zone, the medium-temperature drying zone and the low-temperature heating zone for heat exchange, the temperature of the molten salt is gradually reduced in the process, meanwhile, the electric heating device heats the molten salt flowing out of the low-temperature heating zone by using valley electricity, the high-temperature molten salt formed after heating is stored in the high-temperature molten salt storage zone, the energy cascade utilization system control method realizes the energy storage and energy release process at the load side of the power grid, and the use of valley electricity for heating can reduce the power concentration and the capacity expansion pressure of the transformer substation and power supply line.

[0047] 3、The energy cascade utilization system control method of the application, the first flow regulating valve, the first flow detection unit are arranged on the first pipeline, the second flow regulating valve, the second flow detection unit are arranged on the second pipeline, the third flow regulating valve, the third flow detection unit are arranged on the third pipeline, the fourth flow regulating valve, the fourth flow detection unit are arranged on the fourth pipeline, the flow detection units arranged on the pipelines can provide reference data for the flow regulating valves to adjust the flow of the molten salt in the pipelines, meanwhile, the flow detection units on the pipelines can monitor whether the molten salt is blocked or leaked in the process of flowing through the high-temperature pyrolysis zone, the medium-temperature drying zone and the low-temperature heating zone, and play a role in troubleshooting.

[0048] 4、The first flow detection unit in the control method of the energy cascade utilization system comprises a first detection pipeline, a second detection pipeline and a third detection pipeline which are sequentially connected, wherein the inner diameter of the first detection pipeline and the inner diameter of the third detection pipeline are the same, the inner diameter of the second detection pipeline is smaller than the inner diameters of the first detection pipeline and the third detection pipeline, a first pressure sensor is arranged on the outer wall of the first detection pipeline or the third detection pipeline, a second pressure sensor and a temperature sensor are arranged on the outer wall of the second detection pipeline 132, the structures of the second flow detection unit, the third flow detection unit and the fourth flow detection unit are the same as that of the first flow detection unit, the sensors on the first flow detection unit, the second flow detection unit, the third flow detection unit and the fourth flow detection unit are not directly in contact with the molten salt in the pipeline, so that the sensors are prevented from being corroded; meanwhile, the temperature sensor is arranged in the flow detection unit, the flow detection unit can not only detect the flow but also monitor the temperature of the molten salt in each pipeline, so that the temperature of the molten salt in each area is further ensured to be within the required range. Therefore, in the design, the sensors in each flow detection unit are not directly in contact with the molten salt in the pipeline, so that the sensors are prevented from being corroded; and the flow detection unit can monitor the temperature of the molten salt in each pipeline, so that the temperature of the molten salt in each area is further ensured to be within the required range. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 is a flow chart of the control method of the energy cascade utilization system.

[0050] Figure 2 is a schematic diagram of the energy cascade utilization system.

[0051] Figure 3 is a schematic diagram of another arrangement method of the flow detection unit in the energy cascade utilization system.

[0052] Figure 4 is a schematic diagram of the first flow detection unit.

[0053] In the figure: high-temperature molten salt storage area 1, first pipeline 11, first flow regulating valve 12, first flow detection unit 13, first detection pipeline 131, second detection pipeline 132, third detection pipeline 133, first pressure sensor 134, second pressure sensor 135, temperature sensor 136, high-temperature pyrolysis area 2, second pipeline 21, second flow regulating valve 22, second flow detection unit 23, medium-temperature drying area 3, third pipeline 31, third flow regulating valve 32, third flow detection unit 33, low-temperature heat supply area 4, fourth pipeline 41, fourth flow regulating valve 42, fourth flow detection unit 43, fifth pipeline 5. DETAILED DESCRIPTION

[0054] The application will be further described in detail in connection with the accompanying drawings and specific embodiments.

[0055] As Figure 1 shown in the figure, a control method of an energy cascade utilization system, the energy cascade utilization system is arranged at the load side of a power system, the energy cascade utilization system comprises: a high-temperature molten salt storage area 1, a high-temperature pyrolysis area 2, a medium-temperature drying area 3, and a low-temperature heat supply area 4, a molten salt flow outlet of the high-temperature molten salt storage area 1 is in communication with a molten salt flow inlet of the high-temperature pyrolysis area 2, one molten salt flow outlet of the high-temperature pyrolysis area 2 is in communication with a molten salt flow inlet of the medium-temperature drying area 3, another molten salt flow outlet of the high-temperature pyrolysis area 2 is in communication with one molten salt flow inlet of the low-temperature heat supply area 4, a molten salt flow outlet of the medium-temperature drying area 3 is in communication with another molten salt flow inlet of the low-temperature heat supply area 4, and a molten salt flow outlet of the low-temperature heat supply area 4 is in communication with a molten salt flow inlet of the high-temperature molten salt storage area 1, and an electric heating device is arranged between the low-temperature heat supply area 4 and the high-temperature molten salt storage area 1;

[0056] The control method comprises:

[0057] molten salt flowing out of the molten salt flow outlet of the high-temperature molten salt storage area 1 is introduced into the high-temperature pyrolysis area 2, and the heat of the molten salt in the high-temperature pyrolysis area 2 is used to pyrolyze organic solid waste in the high-temperature pyrolysis area 2;

[0058] molten salt flowing out of one molten salt flow outlet of the high-temperature pyrolysis area 2 is introduced into the medium-temperature drying area 3, and the heat of the molten salt in the medium-temperature drying area 3 is used to dry sludge in the medium-temperature drying area 3;

[0059] molten salt flowing out of another molten salt flow outlet of the high-temperature pyrolysis area 2 and the molten salt flow outlet of the medium-temperature drying area 3 is introduced into the low-temperature heat supply area 4, and the heat of the molten salt in the low-temperature heat supply area 4 is used to supply heat to a terminal in the low-temperature heat supply area 4;

[0060] molten salt flowing out of the molten salt flow outlet of the low-temperature heat supply area 4 is heated, and the heated molten salt is introduced into the high-temperature molten salt storage area 1 for storage.

[0061] In the above implementation manner, by sequentially introducing the molten salt of the high-temperature molten salt area 1 at the load side into the high-temperature pyrolysis area 2, the medium-temperature drying area 3 and the low-temperature heat supply area 4, the cascade utilization of different grade heat energy at the load side can be realized by scheduling the molten salt. The organic solid waste is pyrolyzed by using the molten salt, which can be used to prepare high-quality fuel. The sludge can be domestic sludge and industrial sludge which need to be dried, and the sludge is dried to realize the pre-dewatering treatment of the sludge. The terminal can be a terminal device such as a boiler for heating, the terminal device exchanges heat with the molten salt, absorbs heat and generates heat steam, and then the terminal device supplies the heat steam to a user.

[0062] The temperature of the molten salt flowing out of the high-temperature molten salt storage zone 1 and into the high-temperature pyrolysis zone 2 is higher than the temperature of the molten salt flowing out of the high-temperature pyrolysis zone 2 and into the medium-temperature drying zone 3; similarly, the temperature of the molten salt flowing out of the high-temperature pyrolysis zone 2 and into the medium-temperature drying zone 3 is higher than the temperature of the molten salt flowing out of the medium-temperature drying zone 3 and into the low-temperature heating zone 4. It is understandable that the temperature requirements of these zones must be maintained during the flow of molten salt through the high-temperature pyrolysis zone 2, the medium-temperature drying zone 3, and the low-temperature heating zone 4. The utilization of different grades of thermal energy often requires the scheduling of molten salt at different temperatures, the core of which is monitoring the temperature and flow rate of the molten salt for appropriate allocation.

[0063] The temperature of the molten salt in the high-temperature pyrolysis zone 2 is 450-550℃, the temperature of the molten salt in the medium-temperature drying zone 3 is 300-400℃, and the temperature of the molten salt in the low-temperature heating zone 4 is 200-250℃. In the energy cascade utilization system, the molten salt flows sequentially through the high-temperature pyrolysis zone 2, the medium-temperature drying zone 3, and the low-temperature heating zone 4, and its temperature gradually decreases during this process.

[0064] Normally, only the molten salt flowing out of the medium-temperature drying zone 3 is introduced into the low-temperature heating zone 4 to provide heat to the terminal of the low-temperature heating zone 4. When the heat from the molten salt flowing out of the medium-temperature drying zone 3 is insufficient to effectively heat the terminal of the low-temperature heating zone 4, the molten salt flowing out of the high-temperature pyrolysis zone 2 is introduced into the low-temperature heating zone 4 to supplement the heat of the terminal of the low-temperature heating zone 4.

[0065] The energy cascade utilization system also includes an electric heating device, which uses off-peak electricity to heat the molten salt flowing out of the molten salt outlet of the low-temperature heating zone 4.

[0066] like Figure 2 , Figure 3 As shown, the energy cascade utilization system further includes: a first pipeline 11, a second pipeline 21, a third pipeline 31, a fourth pipeline 41, and a fifth pipeline 5. The molten salt outlet of the high-temperature molten salt storage zone 1 is connected to the molten salt inlet of the high-temperature pyrolysis zone 2 through the first pipeline 11. One molten salt outlet of the high-temperature pyrolysis zone 2 is connected to the molten salt inlet of the medium-temperature drying zone 3 through the second pipeline 21. The other molten salt outlet of the high-temperature pyrolysis zone 2 is connected to one molten salt inlet of the low-temperature heating zone 4 through the fourth pipeline 41. The molten salt outlet of the medium-temperature drying zone 3 is connected to the other molten salt inlet of the low-temperature heating zone 4 through the third pipeline 31. The molten salt outlet of the low-temperature heating zone 4 is connected to the molten salt inlet of the high-temperature molten salt storage zone 1 through the fifth pipeline 5. An electric heating device is installed on the fifth pipeline 5.

[0067] The electric heating device uses valley electricity to charge the molten salt in the fifth pipeline 5. The electric heating device can be an electromagnetic heating device. The electromagnetic heating device generates an alternating magnetic field around a high-frequency coil, generates an induced current on a metal pipeline through which the molten salt passes, and further heats the molten salt in the metal pipeline. Similarly, the electric heating device can also be a device that uses a resistance wire to heat. The charged high-temperature molten salt is stored in the high-temperature molten salt area 1.

[0068] The first pipeline 11 is provided with a first flow detection unit 13 for detecting the flow of molten salt in the first pipeline 11 in real time. Meanwhile, the first pipeline 11 is provided with a first flow regulating valve 12 for regulating the flow of molten salt in the first pipeline 11.

[0069] The second pipeline 21 is provided with a second flow detection unit 23 for detecting the flow of molten salt in the second pipeline 21. Meanwhile, the second pipeline 21 is provided with a second flow regulating valve 22 for regulating the flow of molten salt in the second pipeline 21.

[0070] The third pipeline 31 is provided with a third flow detection unit 33 for detecting the flow of molten salt in the third pipeline 31. Meanwhile, the third pipeline 31 is provided with a third flow regulating valve 32 for regulating the flow of molten salt in the third pipeline 31.

[0071] The fourth pipeline 41 is provided with a fourth flow detection unit 43 for detecting the flow of molten salt in the fourth pipeline 41. The fourth pipeline 41 is provided with a fourth flow regulating valve 42 for regulating the flow of molten salt in the fourth pipeline 41.

[0072] The first flow regulating valve 12, the second flow regulating valve 22, the third flow regulating valve 32, and the fourth flow regulating valve 42 can be electromagnetic valves with adjustable opening degrees, or other mechanical valves with adjustable opening degrees. By adjusting the opening degree of the first flow regulating valve 12, the flow of molten salt in the first pipeline 11 can be adjusted, thereby changing the flow of molten salt flowing out of the high-temperature molten salt storage area 1 and into the high-temperature pyrolysis area 2. By adjusting the opening degree of the second flow regulating valve 22, the flow of molten salt in the second pipeline 21 can be adjusted, thereby changing the flow of molten salt flowing out of the high-temperature pyrolysis area 2 and into the medium-temperature drying area 3. By adjusting the opening degree of the third flow regulating valve 32, the flow of molten salt in the third pipeline 31 can be adjusted, thereby changing the flow of molten salt flowing out of the medium-temperature drying area 3 and into the low-temperature heating area 4. By adjusting the opening degree of the fourth flow regulating valve 42, the flow of molten salt in the fourth pipeline 41 can be adjusted, thereby changing the flow of molten salt flowing out of the high-temperature pyrolysis area 2 and into the low-temperature heating area 4.

[0073] According to the real-time adjustment of the opening degrees of the first flow regulating valve 12, the second flow regulating valve 22, the third flow regulating valve 32 and the fourth flow regulating valve 42 according to the temperatures of the molten salts in the high-temperature molten salt storage area 1, the high-temperature pyrolysis area 2, the medium-temperature drying area 3 and the low-temperature heat supply area 4, the temperatures of the molten salts in the high-temperature pyrolysis area 2, the medium-temperature drying area 3 and the low-temperature heat supply area 4 can be controlled, and thus the temperature of the molten salt in the high-temperature pyrolysis area 2 is ensured to be within the range of 450-550℃, the temperature of the molten salt in the medium-temperature drying area 3 is ensured to be within the range of 300-400℃, and the temperature of the molten salt in the low-temperature heat supply area 4 is ensured to be within the range of 200-250℃.

[0074] In order to realize the utilization of different grades of heat energy, the molten salts with different temperatures need to be adjusted. The flow detection units and the flow regulating valves arranged in the pipelines can monitor and adjust the flow of the molten salts in each pipeline, and thus ensure that the temperatures of the molten salts in each area meet the requirements.

[0075] Figure 2 FIG. 1 is a schematic diagram of a setting method of the flow detection units, wherein the first flow detection unit 13 is arranged on the pipeline at the inlet side of the first flow regulating valve 12; the second flow detection unit 23 is arranged on the pipeline at the inlet side of the second flow regulating valve 22; the third flow detection unit 33 is arranged on the pipeline at the inlet side of the third flow regulating valve 32; and the fourth flow detection unit 43 is arranged on the pipeline at the inlet side of the fourth flow regulating valve 42. The arrangement of the flow detection units and the flow regulating valves can monitor whether the molten salts are blocked or leaked during the process of flowing through the high-temperature pyrolysis area 2, the medium-temperature drying area 3 and the low-temperature heat supply area 4, and thus play a role in troubleshooting.

[0076] Figure 3 FIG. 2 is a schematic diagram of another setting method of the flow detection units, wherein the first flow detection unit 13 is arranged on the pipeline at the outlet side of the first flow regulating valve 12; the second flow detection unit 23 is arranged on the pipeline at the outlet side of the second flow regulating valve 22; the third flow detection unit 33 is arranged on the pipeline at the outlet side of the third flow regulating valve 32; and the fourth flow detection unit 43 is arranged on the pipeline at the outlet side of the fourth flow regulating valve 42.

[0077] The first flow detection unit 13 comprises a first detection pipeline 131, a second detection pipeline 132 and a third detection pipeline 133 which are sequentially communicated, and the first detection pipeline 131, the second detection pipeline 132 and the third detection pipeline 133 are all pipes with circular cross sections, wherein the inner diameter of the first detection pipeline 131 and the inner diameter of the third detection pipeline 133 are the same, and the inner diameter of the second detection pipeline 132 is smaller than the inner diameters of the first detection pipeline 131 and the third detection pipeline 133.

[0078] The first detection pipeline 131 or the third detection pipeline 133 is provided with a first pressure sensor 134 on the outer wall, as shown in the figure. Figure 4 The first pressure sensor 134 is provided on the outer wall of the first detection pipeline 131. The second detection pipeline 132 is provided with a second pressure sensor 135 and a temperature sensor 136 on the outer wall.

[0079] The structures of the second flow detection unit 23, the third flow detection unit 33, and the fourth flow detection unit 43 are the same as that of the first flow detection unit 13.

[0080] Because the molten salt is corrosive, it may damage the flow sensor, so the sensor cannot be directly arranged inside the pipeline. Therefore, by arranging a reducing pipeline and installing a pressure and temperature sensor on the outside of the reducing pipeline, the flow of the molten salt flowing through the reducing pipeline can be obtained according to the data detected by the pressure and temperature sensor, and the flow of the molten salt flowing through the pipeline where the detection unit is arranged is indirectly measured.

[0081] The first flow detection unit 13 detects the flow of the molten salt in the first pipeline 11, which specifically includes the following steps:

[0082] Step one, obtain the current density p of the molten salt, obtain the first current pressure p1 through the first pressure sensor 134, and obtain the second current pressure p2 through the second pressure sensor 135;

[0083] Step two, calculate the first flow rate v1 and the second flow rate v2 according to formula (1):

[0084]

[0085] In formula (1), d1 is the inner diameter of the first detection pipeline 131 or the third detection pipeline 133, and d2 is the inner diameter of the second detection pipeline 132;

[0086] Step three, calculate the flow according to formula (2) or (3):

[0087]

[0088]

[0089] In formula (2) and formula (3), Q is the current flow of the molten salt in the first pipeline 11;

[0090] The second flow regulating valve 22 detects the flow of the molten salt in the second pipeline 21, the third flow regulating valve 32 detects the flow of the molten salt in the third pipeline 31, and the fourth flow detection unit 43 detects the flow of the molten salt in the fourth pipeline 41. The way of detecting the flow of the molten salt in the first pipeline 11 by the first flow detection unit 13 is the same.

[0091] The step one, obtaining the current density of molten salt ρ specifically includes:

[0092] A preset database is set, and the preset database stores the density of molten salt at different temperatures;

[0093] The current temperature T of the molten salt is obtained by the temperature sensor 136, and the current density ρ of the molten salt is obtained according to the current temperature T of the molten salt and the preset database.

[0094] The principle of the application is as follows:

[0095] The first flow detection unit 13 can detect the flow and temperature of the high-temperature molten salt in the first pipeline 11, and the first flow regulating valve 12 can regulate and control the flow of the high-temperature molten salt entering the high-temperature pyrolysis zone 2, and then the high-temperature molten salt is heated in the high-temperature pyrolysis zone 2 to form medium-temperature molten salt;

[0096] The second flow detection unit 23 can detect the flow and temperature of the medium-temperature molten salt in the second pipeline 21, and the fourth flow detection unit 43 can detect the flow and temperature of the medium-temperature molten salt in the fourth pipeline 41, and the second flow regulating valve 22 and the fourth flow regulating valve 42 can respectively regulate and control the flow of the medium-temperature molten salt entering the medium-temperature drying zone 3 and the low-temperature heating zone 4, and the medium-temperature molten salt is heated in the medium-temperature drying zone 3 to form low-temperature molten salt;

[0097] The third flow regulating valve 32 can detect the flow and temperature of the low-temperature molten salt in the third pipeline 31, and the third flow regulating valve 32 can regulate and control the flow of the low-temperature molten salt entering the low-temperature heating zone 4.

[0098] During the night valley electricity period, the molten salt in the low-temperature heating zone 4 enters the high-temperature molten salt storage zone 1 through the fifth pipeline 5, and the electric heating device on the fifth pipeline 5 uses valley electricity to heat the molten salt flowing through the fifth pipeline 5, and the heated high-temperature molten salt enters the high-temperature molten salt storage zone 1 for storage.

[0099] Embodiment 1:

[0100] A control method of an energy cascade utilization system, the energy cascade utilization system comprising: a high-temperature molten salt storage zone 1, a high-temperature pyrolysis zone 2, a medium-temperature drying zone 3, and a low-temperature heating zone 4, the molten salt outflow of the high-temperature molten salt storage zone 1 is connected with the molten salt inflow of the high-temperature pyrolysis zone 2, the molten salt outflow of the high-temperature pyrolysis zone 2 is connected with the molten salt inflow of the medium-temperature drying zone 3, the molten salt outflow of the medium-temperature drying zone 3 is connected with the molten salt inflow of the low-temperature heating zone 4, and the molten salt outflow of the low-temperature heating zone 4 is connected with the molten salt inflow of the high-temperature molten salt storage zone 1;

[0101] The control method comprises:

[0102] The molten salt flowing out of the molten salt flow outlet of the high-temperature pyrolysis zone 2 is introduced into the low-temperature heat supply zone 4, and the heat of the molten salt in the low-temperature heat supply zone 4 is used to supply heat to the terminal in the low-temperature heat supply zone 4.

[0103] The molten salt flowing out of the molten salt flow outlet of the high-temperature pyrolysis zone 2 is introduced into the low-temperature heat supply zone 4, and the heat of the molten salt in the low-temperature heat supply zone 4 is used to supply heat to the terminal in the low-temperature heat supply zone 4.

[0104] The molten salt flowing out of the molten salt flow outlet of the high-temperature pyrolysis zone 2 is introduced into the low-temperature heat supply zone 4, and the heat of the molten salt in the low-temperature heat supply zone 4 is used to supply heat to the terminal in the low-temperature heat supply zone 4.

[0105] The molten salt flowing out of the molten salt flow outlet of the high-temperature pyrolysis zone 2 is introduced into the low-temperature heat supply zone 4, and the heat of the molten salt in the low-temperature heat supply zone 4 is used to supply heat to the terminal in the low-temperature heat supply zone 4.

[0106] The molten salt flowing out of the molten salt flow outlet of the high-temperature pyrolysis zone 2 is introduced into the low-temperature heat supply zone 4, and the heat of the molten salt in the low-temperature heat supply zone 4 is used to supply heat to the terminal in the low-temperature heat supply zone 4.

[0107] The control method further comprises:

[0108] The molten salt flowing out of the molten salt flow outlet of the high-temperature pyrolysis zone 2 is introduced into the low-temperature heat supply zone 4, and the heat of the molten salt in the low-temperature heat supply zone 4 is used to supply heat to the terminal in the low-temperature heat supply zone 4.

[0109] The energy cascade utilization system further comprises a first pipeline 11, a second pipeline 21, a third pipeline 31, a fourth pipeline 41, and a fifth pipeline 5, the molten salt flow outlet of the high-temperature molten salt storage zone 1 is connected to the molten salt flow inlet of the high-temperature pyrolysis zone 2 through the first pipeline 11, the molten salt flow outlet of the high-temperature pyrolysis zone 2 is connected to the molten salt flow inlet of the medium-temperature drying zone 3 through the second pipeline 21, the molten salt flow outlet of the medium-temperature drying zone 3 is connected to the molten salt flow inlet of the low-temperature heat supply zone 4 through the third pipeline 31, the molten salt flow inlet of the low-temperature heat supply zone 4 is connected to the molten salt flow outlet of the high-temperature pyrolysis zone 2 through the fourth pipeline 41, and the molten salt flow outlet of the low-temperature heat supply zone 4 is connected to the molten salt flow inlet of the high-temperature molten salt storage zone 1 through the fifth pipeline 5, and an electric heating device is arranged on the fifth pipeline 5.

[0110] The electric heating device heats the molten salt in the fifth pipeline 5.

[0111] The first pipeline 11 is provided with a first flow regulating valve 12 for regulating the flow of molten salt in the first pipeline 11; the second pipeline 21 is provided with a second flow regulating valve 22 for regulating the flow of molten salt in the second pipeline 21; the third pipeline 31 is provided with a third flow regulating valve 32 for regulating the flow of molten salt in the third pipeline 31; the fourth pipeline 41 is provided with a fourth flow regulating valve 42 for regulating the flow of molten salt in the fourth pipeline 41; the first pipeline 11 is provided with a first flow detection unit 13 for detecting the flow of molten salt in the first pipeline 11; the second pipeline 21 is provided with a second flow detection unit 23 for detecting the flow of molten salt in the second pipeline 21; the third pipeline 31 is provided with a third flow detection unit 33 for detecting the flow of molten salt in the third pipeline 31; the fourth pipeline 41 is provided with a fourth flow detection unit 43 for detecting the flow of molten salt in the fourth pipeline 41; the first flow detection unit 13 comprises a first detection pipeline 131, a second detection pipeline 132 and a third detection pipeline 133 connected in sequence, the inner diameter of the first detection pipeline 131 and the inner diameter of the third detection pipeline 133 are the same, and the inner diameter of the second detection pipeline 132 is smaller than the inner diameters of the first detection pipeline 131 and the third detection pipeline 133; a first pressure sensor 134 is arranged on the outer wall of the first detection pipeline 131 or the third detection pipeline 133, and a second pressure sensor 135 and a temperature sensor 136 are arranged on the outer wall of the second detection pipeline 132; the structures of the second flow detection unit 23, the third flow detection unit 33 and the fourth flow detection unit 43 are the same as that of the first flow detection unit 13.

[0112] The first flow detection unit 13 detects the flow of molten salt in the first pipeline 11, which specifically comprises:

[0113] Step one, obtain the current density p of molten salt in the first flow detection unit 13, obtain the first current pressure p1 through the first pressure sensor 134, and obtain the second current pressure p2 through the second pressure sensor 135;

[0114] Step two, calculate the first flow rate v1 and the second flow rate v2 according to formula (1):

[0115]

[0116] In formula (1), d1 is the inner diameter of the first detection pipeline 131 or the third detection pipeline 133, and d2 is the inner diameter of the second detection pipeline 132;

[0117] Step three, calculate the flow according to formula (2) or (3):

[0118]

[0119]

[0120] In formula (2), formula (3), Q is the current flow of the molten salt in the first pipeline 11;

[0121] The method for detecting the flow of the molten salt in the second pipeline 21 by the second flow regulating valve 22, the flow of the molten salt in the third pipeline 31 by the third flow regulating valve 32, and the flow of the molten salt in the fourth pipeline 41 by the fourth flow detecting unit 43 is the same as the method for detecting the flow of the molten salt in the first pipeline 11 by the first flow detecting unit 13.

[0122] In step one, obtaining the current density p of the molten salt in the first flow detecting unit 13 specifically includes:

[0123] A preset database is set, and the preset database stores the density of the molten salt at different temperatures;

[0124] The current temperature T of the molten salt in the first flow detecting unit 13 is obtained by the temperature sensor 136, and the current density p of the molten salt in the first flow detecting unit 13 is obtained according to the current temperature T of the molten salt and the preset database.

[0125] Embodiment 2:

[0126] Embodiment 2 is basically the same as embodiment 1, and the difference is that:

[0127] The temperature of the molten salt in the high-temperature pyrolysis zone 2 is 450-550℃, the temperature of the molten salt in the medium-temperature drying zone 3 is 300-400℃, and the temperature of the molten salt in the low-temperature heat supply zone 4 is 200-250℃.

[0128] Embodiment 3:

[0129] Embodiment 3 is basically the same as embodiment 2, and the difference is that:

[0130] The electric heating device heats the molten salt flowing out of the low-temperature heat supply zone 4 by using valley electricity.

[0131] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above embodiment, but any equivalent modification or change made by the ordinary skilled in the art according to the disclosed content of the present application shall be included in the protection scope recorded in the claims.

Claims

1. A control method of an energy cascade utilization system, characterized in that: the energy cascade utilization system comprises a high-temperature molten salt storage area (1), a high-temperature pyrolysis area (2), a medium-temperature drying area (3), and a low-temperature heat supply area (4), the molten salt outlet of the high-temperature molten salt storage area (1) is connected to the molten salt inlet of the high-temperature pyrolysis area (2), the molten salt outlet of the high-temperature pyrolysis area (2) is connected to the molten salt inlet of the medium-temperature drying area (3), the molten salt outlet of the medium-temperature drying area (3) is connected to the molten salt inlet of the low-temperature heat supply area (4), and the molten salt outlet of the low-temperature heat supply area (4) is connected to the molten salt inlet of the high-temperature molten salt storage area (1); the control method comprises: passing the molten salt flowing out of the molten salt outlet of the high-temperature molten salt storage area (1) into the high-temperature pyrolysis area (2), and using the heat of the molten salt in the high-temperature pyrolysis area (2) to pyrolyze the organic solid waste in the high-temperature pyrolysis area (2); passing the molten salt flowing out of the molten salt outlet of the high-temperature pyrolysis area (2) into the medium-temperature drying area (3), and using the heat of the molten salt in the medium-temperature drying area (3) to dry the sludge in the medium-temperature drying area (3); passing the molten salt flowing out of the molten salt outlet of the medium-temperature drying area (3) into the low-temperature heat supply area (4), and using the heat of the molten salt in the low-temperature heat supply area (4) to supply heat to the terminal in the low-temperature heat supply area (4); heating the molten salt flowing out of the molten salt outlet of the low-temperature heat supply area (4), and passing the heated molten salt into the high-temperature molten salt storage area (1) for storage; the temperature of the molten salt in the high-temperature pyrolysis area (2) is 450-550℃, the temperature of the molten salt in the medium-temperature drying area (3) is 300-400℃, and the temperature of the molten salt in the low-temperature heat supply area (4) is 200-250℃; the molten salt inlet of the low-temperature heat supply area (4) is connected to the molten salt outlet of the high-temperature pyrolysis area (2); and the control method further comprises: passing the molten salt flowing out of the molten salt outlet of the high-temperature pyrolysis area (2) into the low-temperature heat supply area (4), and using the heat of the molten salt in the low-temperature heat supply area (4) to supply heat to the terminal in the low-temperature heat supply area (4); the energy cascade utilization system further comprises a first pipeline (11), a second pipeline (21), a third pipeline (31), a fourth pipeline (41), and a fifth pipeline (5), the molten salt outlet of the high-temperature molten salt storage area (1) is connected to the molten salt inlet of the high-temperature pyrolysis area (2) through the first pipeline (11), the molten salt outlet of the high-temperature pyrolysis area (2) is connected to the molten salt inlet of the medium-temperature drying area (3) through the second pipeline (21), the molten salt outlet of the medium-temperature drying area (3) is connected to the molten salt inlet of the low-temperature heat supply area (4) through the third pipeline (31), the molten salt inlet of the low-temperature heat supply area (4) is connected to the molten salt outlet of the high-temperature pyrolysis area (2) through the fourth pipeline (41), the molten salt outlet of the low-temperature heat supply area (4) is connected to the molten salt inlet of the high-temperature molten salt storage area (1) through the fifth pipeline (5), and an electric heating device is arranged on the fifth pipeline (5); and the electric heating device heats the molten salt in the fifth pipeline (5). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2.The control method of the energy cascade utilization system according to claim 1, characterized in that: the electric heating device heats the molten salt flowing out of the low-temperature heat supply area (4) using valley electricity. 3.The control method of the energy cascade utilization system according to claim 1 or 2, characterized in that: a first flow regulating valve (12) is arranged on the first pipeline (11) and is used to regulate the flow of the molten salt in the first pipeline (11) ; a second flow regulating valve (22) is arranged on the second pipeline (21) and is used to regulate the flow of the molten salt in the second pipeline (21) ; a third flow regulating valve (32) is arranged on the third pipeline (31) and is used to regulate the flow of the molten salt in the third pipeline (31) ; a fourth flow regulating valve (42) is arranged on the fourth pipeline (41) and is used to regulate the flow of the molten salt in the fourth pipeline (41). 4.The control method of the energy cascade utilization system according to claim 3, characterized in that: a first flow detecting unit (13) is arranged on the first pipeline (11) and is used to detect the flow of the molten salt in the first pipeline (11) ; a second flow detecting unit (23) is arranged on the second pipeline (21) and is used to detect the flow of the molten salt in the second pipeline (21) ; a third flow detecting unit (33) is arranged on the third pipeline (31) and is used to detect the flow of the molten salt in the third pipeline (31) ; a fourth flow detecting unit (43) is arranged on the fourth pipeline (41) and is used to detect the flow of the molten salt in the fourth pipeline (41). 5.The control method of the energy cascade utilization system according to claim 4, characterized in that: the first flow detecting unit (13) comprises a first detecting pipeline (131), a second detecting pipeline (132) and a third detecting pipeline (133) which are sequentially connected, the inner diameter of the first detecting pipeline (131) and the inner diameter of the third detecting pipeline (133) are the same, and the inner diameter of the second detecting pipeline (132) is smaller than the inner diameters of the first detecting pipeline (131) and the third detecting pipeline (133) ; a first pressure sensor (134) is arranged on the outer wall of the first detecting pipeline (131) or the third detecting pipeline (133), and a second pressure sensor (135) and a temperature sensor (136) are arranged on the outer wall of the second detecting pipeline (132) ; the structures of the second flow detecting unit (23), the third flow detecting unit (33) and the fourth flow detecting unit (43) are the same as the structure of the first flow detecting unit (13). 6.The control method of the energy cascade utilization system according to claim 5, characterized in that: the detection of the flow of the molten salt in the first pipeline (11) by the first flow detecting unit (13) specifically comprises: Step one, obtaining the current density of the molten salt in the first flow detection unit (13) obtaining the first current pressure through the first pressure sensor (134) obtaining the second current pressure through the second pressure sensor (135) ; Step two, calculate the first flow rate according to formula (1) , second flow rate : （1） In formula (1), is an inner diameter of the first detection line (131) or the third detection line (133), is an inner diameter of the second detection line (132); Step three, calculate the flow according to formula (2) or (3): （2） （3） in formula (2), formula (3), is the current flow of the molten salt in the first line (11); The second flow detection unit (23) detects the flow of the molten salt in the second pipeline (21), the third flow detection unit (33) detects the flow of the molten salt in the third pipeline (31), and the fourth flow detection unit (43) detects the flow of the molten salt in the fourth pipeline (41). The method for detecting the flow of the molten salt in the first pipeline (11) by the first flow detection unit (13) is the same.

7. The control method of the energy cascade utilization system according to claim 6, characterized in that: In the step one, the current density of the molten salt in the first flow detection unit (13) is acquired Specifically comprising: A preset database is arranged, and the preset database stores the densities of the molten salt at different temperatures; The current temperature T of the molten salt in the first flow detection unit (13) is acquired by the temperature sensor (136), and the current density of the molten salt in the first flow detection unit (13) is acquired according to the current temperature T of the molten salt and a preset database .

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