Fused salt heat storage system based on electricity price adjustment and control method

Abstract

The invention relates to a fused salt heat storage technology in a spinning process, in particular to a fused salt heat storage system based on electricity price adjustment and a control method.The fused salt heat storage system comprises a fused salt pipeline, a steam pipeline and a nylon pipeline, and the fused salt pipeline is provided with a fused salt storage tank, an electric heater, a first circulating pump, a heat exchanger and a second circulating pump; a third circulating pump is arranged on the steam pipeline; a screw extruder, a spinning machine and a steam sleeve are arranged on the nylon pipeline; the electric power demand in the peak period is remarkably reduced, the pressure of an electric power system in the peak period is relieved, the social benefit is remarkable, fused salt heat storage and heating are combined together, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the molten salt heat storage technology in the spinning process, and particularly relates to a molten salt heat storage system and a control method based on electricity price regulation. Background Art

[0002] With the increasing requirements of industry for energy conservation and emission reduction, heat energy storage technology has been widely applied in many industrial fields. Especially in the spinning process, high-temperature heating is a key factor to ensure production quality and efficiency. Traditional heating methods usually rely on power supply, and there are certain challenges in temperature control. In contrast, the molten salt heat storage system has significant advantages: molten salt can work stably at temperatures above 500 °C, and it has a large heat capacity and good thermal conductivity, and can maintain a stable high temperature for a long time, which is suitable for heat energy storage and release in medium- and high-temperature processes. Compared with traditional low-temperature heat storage media such as water or paraffin, the application of molten salt in the spinning process can reduce heat loss, improve heating efficiency, and have a longer heat storage time limit, ensuring the temperature stability in the process.

[0003] Current molten salt heat storage systems, such as a method and system for intelligently adjusting the molten salt heat storage rate with the Chinese patent publication number CN117663503B, mostly focus on heat storage and do not fully consider the impact of different electricity price periods on power consumption; in addition, such as a flexible operation system of a thermal power unit based on molten salt heat storage with the Chinese patent publication number CN114909193B, the molten salt heat storage and heating systems in the existing molten salt heat storage systems are separated, and the system integration cannot be achieved, and the overall optimization of the system cannot be realized, and there are still problems of low working efficiency and high cost.

[0004] With the gradual advancement of electricity price marketization, the fluctuation of electricity prices has become an important factor in the operating costs of enterprises. Especially in some high-energy-consuming production processes, the electricity price fluctuation directly affects the economy of production. Traditional heating methods cannot fully consider the electricity price fluctuation, resulting in a large amount of power consumption still being required during peak electricity price periods, increasing production costs, and high energy consumption will bring great pressure to the power system and may cause power outages in some areas. Summary of the Invention

[0005] In order to solve the problems that existing molten salt heat storage systems mostly focus on heat storage and do not fully consider the impact of different electricity price periods on power consumption, resulting in great pressure on the power system; the molten salt heat storage and heating systems are separated, and the overall optimization of the system cannot be achieved, and the working efficiency is poor; therefore, the present invention provides a molten salt heat storage system and a control method based on electricity price regulation, which significantly reduces the power demand during peak periods, alleviates the pressure on the power system during peak periods, has significant social benefits, and combines molten salt heat storage and heating to improve the working efficiency.

[0006] The technical solution of the present invention is as follows:

[0007] A molten salt thermal energy storage system based on electricity price regulation, comprising a molten salt pipeline, a steam pipeline and a nylon pipeline. A molten salt storage tank, an electric heater, a first circulation pump, a heat exchanger and a second circulation pump are arranged on the molten salt pipeline; a third circulation pump is arranged on the steam pipeline; a screw extruder, a spinning machine and a steam sleeve are arranged on the nylon pipeline;

[0008] The outlet of the molten salt storage tank is connected to the inlet of the first circulation pump, the outlet of the first circulation pump is connected to the lower inlet of the heat exchanger, the lower outlet of the heat exchanger is connected to the inlet of the second circulation pump, the outlet of the second circulation pump is connected to the inlet of the molten salt storage tank, and the electric heater is installed in the molten salt storage tank;

[0009] The upper outlet of the heat exchanger is connected to the inlet of the steam sleeve and the inlet of the third circulation pump, the outlet of the steam sleeve is connected to the inlet of the third circulation pump, and the outlet of the third circulation pump is connected to the upper inlet of the heat exchanger;

[0010] The screw extruder is connected to the spinning machine through a nylon pipeline, and the steam sleeve is sleeved on the outer periphery of the nylon pipeline.

[0011] Further, the electric heater is an electric heating tube or an electric heating wire, which is used to convert electric energy into heat energy to heat the molten salt.

[0012] Further, the heat exchanger includes an upper chamber and a lower chamber. The upper chamber is a steam chamber, the lower chamber is a molten salt chamber, and the two are separated by a heat exchange wall surface. The molten salt transfers heat to the steam through the heat exchange wall surface.

[0013] Further, the material of the molten salt storage tank is a high-temperature resistant metal material, which can withstand the high-temperature environment of the molten salt, and a thermometer, a pressure gauge and a timing switch are provided on the tank.

[0014] Further, a first valve, a second valve and a third valve are respectively installed on the first circulation pump, the second circulation pump and the third circulation pump.

[0015] Further, the molten salt pipeline is provided with a first electric valve and a second electric valve. The first electric valve is arranged on the molten salt pipeline between the first circulation pump and the heat exchanger; the second electric valve is arranged on the molten salt pipeline between the second circulation pump and the molten salt storage tank.

[0016] Further, the steam pipeline is provided with a third electric valve and a fourth electric valve. The third electric valve is arranged on the steam pipeline between the heat exchanger and the fourth electric valve; the fourth electric valve is on the steam pipeline between the third electric valve and the third circulation pump.

[0017] A control method for a molten salt thermal energy storage system, which is used to control the above-mentioned molten salt thermal energy storage system, includes:

[0018] During the low electricity price period, turn on the electric heater to heat the molten salt for heat storage, and turn off the first circulation pump, the second electric valve, the heat exchanger, the second circulation pump, and the third circulation pump;

[0019] During the high electricity price period, turn off the electric heater, turn on the first circulation pump, the second electric valve, the heat exchanger, the second circulation pump, and the third circulation pump. The high-temperature molten salt enters the heat exchanger to transfer heat to the steam, and the steam enters the steam pipeline to provide energy supply for the screw extruder and the spinning machine.

[0020] Furthermore, the electric heater converts electrical energy into heat energy to continuously heat the molten salt.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) By heating the molten salt for energy storage during the low electricity price period and releasing heat during the high price period, the present invention significantly reduces the power consumption during the high price period, optimizes the energy utilization efficiency, and alleviates the problem of excessive pressure on the power system during the high price period.

[0023] (2) Using a high-temperature stable binary salt as the heat storage medium ensures the high-temperature requirements suitable for the spinning process, and improves the production efficiency and product quality.

[0024] (3) In addition, the present invention reduces the production cost and carbon emissions through an intelligent control mechanism, providing an efficient, energy-saving and economical solution for the spinning process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the present invention;

[0026] In the figure: 1 - molten salt storage tank; 2 - electric heater; 3 - first circulation pump; 4 - first valve; 5 - first electric valve; 6 - heat exchanger; 7 - second circulation pump; 8 - second valve; 9 - second electric valve; 10 - third electric valve; 11 - fourth electric valve; 12 - third circulation pump; 13 - third valve; 14 - screw extruder; 15 - spinning machine; 16 - steam sleeve, 17 - molten salt pipeline, 18 - steam pipeline. 19 - nylon pipeline. DETAILED DESCRIPTION OF THE INVENTION

[0027] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0028] See Figure 1, A molten salt thermal energy storage system based on electricity price regulation, comprising a molten salt pipeline 17, a steam pipeline 18 and a nylon pipeline 19. A molten salt storage tank 1, an electric heater 2, a first circulation pump 3, a heat exchanger 6 and a second circulation pump 7 are arranged on the molten salt pipeline 17; a third circulation pump 12 is arranged on the steam pipeline 18; a screw extruder 14, a spinning machine 15 and a steam sleeve 16 are arranged on the nylon pipeline 19;

[0029] The outlet of the molten salt storage tank 1 is connected to the inlet of the first circulation pump 3. The outlet of the first circulation pump 3 is connected to the lower inlet of the heat exchanger 6. The lower outlet of the heat exchanger 6 is connected to the inlet of the second circulation pump 7. The outlet of the second circulation pump 7 is connected to the inlet of the molten salt storage tank 1. The electric heater 2 is installed in the molten salt storage tank 1;

[0030] The upper outlet of the heat exchanger 6 is connected to the inlet of the steam sleeve 16 and the inlet of the third circulation pump 12. The outlet of the third circulation pump 12 is connected to the upper inlet of the heat exchanger 6;

[0031] The screw extruder 14 is connected to the spinning machine 15 through a nylon pipeline. The steam sleeve 16 is sleeved on the outer periphery of the nylon pipeline 19.

[0032] In the present invention, the heat exchanger 6 adopts a shell structure. The upper chamber is a steam chamber, and the lower chamber is a molten salt chamber. The two are separated by a heat exchange wall surface. The molten salt transfers heat to the steam in the upper chamber through the heat exchange wall surface to achieve heat energy exchange.

[0033] In the present invention, steam surrounds the screw extruder 14 and the spinning machine 15 through the steam sleeve 16 to ensure uniform heating. The steam flow rate and temperature are regulated by a fourth electric valve 11 and a third circulation pump 12. Through the above components, steam provides heat to the screw extruder 14 and the spinning machine 15 to ensure stable heat supply during the process. The steam after heat exchange in the heat exchanger flows to the steam sleeve through the steam pipeline. The fourth electric valve 11 is a pressure valve, and its purpose is to make a part of the steam flow to the steam sleeve and a part of it circulate in this steam pipeline.

[0034] In an embodiment of the present invention, the electric heater 2 is an electric heating tube or an electric heating wire, which is used to convert electric energy into heat energy to heat the molten salt; during the low electricity price period, the electric heater 2 converts electric energy into heat energy to continuously heat the molten salt. The electric heater 2 is an electric heating tube or an electric heating wire, which heats the molten salt through current to enable the molten salt energy storage system to accumulate heat;

[0035] In another embodiment of the present invention, the heat exchanger 4 includes an upper chamber and a lower chamber. The upper chamber is a steam chamber, and the lower chamber is a molten salt chamber. The two are separated by a heat exchange wall surface, and the molten salt transfers heat to the steam through the heat exchange wall surface.

[0036] In a preferred embodiment of the present invention, the molten salt storage tank 1 is made of high-temperature resistant metal material, and a thermometer and a pressure gauge are installed to monitor the internal environment of the storage tank. By setting a timing switch, the working period of the molten salt storage tank 1 can be controlled. It has a high heat storage capacity and good thermal stability, and can operate in a high-temperature environment. A binary salt such as a mixture of sodium chloride and potassium chloride is used as the heat storage medium in the molten salt storage tank, which can work stably at high temperature and store heat energy. The electric heater converts electrical energy into heat energy and heats the molten salt during the low electricity price period.

[0037] In an embodiment of the present invention, the first circulation pump 3, the second circulation pump 7, and the third circulation pump 12 are respectively equipped with the first valve 4, the second valve 8, and the third valve 13. The first valve 4, the second valve 8, and the third valve 13 can help control the liquid flow direction and flow rate, ensure the safe operation of the system, and avoid blockage caused by liquid backflow or improper flow.

[0038] The molten salt flows into the heat exchanger 6 through the circulation pump 3 and the first electric valve 5, and transfers heat to the steam through the heat exchange wall surface. The steam flows into the steam heating supply system through the upper side outlet of the heat exchanger 6. The molten salt after exchanging heat flows back into the molten salt storage tank 1 through the second circulation pump 7 and the second electric valve 9, realizing sustainable recycling.

[0039] A control method for a molten salt heat storage system includes:

[0040] During the low electricity price period, turn on the electric heater 2 to heat the molten salt for heat storage, and turn off the first circulation pump 3, the second electric valve 9, the heat exchanger 6, the second circulation pump 7, and the third circulation pump 12;

[0041] During the high electricity price period, turn off the electric heater 2, turn on the first circulation pump 3, the second electric valve 9, the heat exchanger 6, the second circulation pump 7, and the third circulation pump 12. The high-temperature molten salt enters the heat exchanger 6 to transfer heat to the steam, and the steam enters the steam pipeline 17 to provide energy supply for the screw extruder 14 and the spinning machine 15.

[0042] The following is a specific application scenario of the present invention:

[0043] In a certain city, the period from 12:00 am to 8:00 am is the low electricity price period, and 9:00 - 12:00,

[0044] 15:00 - 20:00 is the high electricity price period. That is, from 12:00 am to 8:00 am, the molten salt is heated, and at this time, the inlet and outlet of the molten salt storage tank are closed; during the peak period, the inlet and outlet of the molten salt storage tank are opened to release heat through the system.

[0045] The above are only embodiments of the present invention, and do not thus limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall similarly be included within the patent protection scope of the present invention.

Claims

1. A molten salt heat storage system based on electricity price regulation, characterized in that: The invention comprises a molten salt pipeline (17), a steam pipeline (18) and a nylon pipeline (19); the molten salt pipeline (17) is provided with a molten salt storage tank (1), an electric heater (2), a first circulation pump (3), a heat exchanger (6) and a second circulation pump (7); the steam pipeline (18) is provided with a third circulation pump (12); the nylon pipeline (19) is provided with a screw extruder (14), a spinning machine (15) and a steam sleeve (16); The outlet of the molten salt storage tank (1) is connected to the inlet of the first circulation pump (3), the outlet of the first circulation pump (3) is connected to the lower inlet of the heat exchanger (6), the lower outlet of the heat exchanger (6) is connected to the inlet of the second circulation pump (7), the outlet of the second circulation pump (7) is connected to the inlet of the molten salt storage tank (1), and the electric heater (2) is installed in the molten salt storage tank (1); The upper outlet of the heat exchanger (6) is connected to the inlet of the steam jacket (16) and the inlet of the third circulation pump (12); the outlet of the steam jacket (16) is connected to the inlet of the third circulation pump (12); and the outlet of the third circulation pump (12) is connected to the upper inlet of the heat exchanger (6); The screw extruder (14) is connected to the spinning machine (15) via a nylon pipe (19), and the steam sleeve (16) is sleeved on the outer periphery of the nylon channel (19).

2. A molten salt heat storage system based on electricity price regulation according to claim 1, characterized in that: The electric heater (2) is an electric heating tube or an electric heating wire, which is used to convert electrical energy into thermal energy to heat the molten salt.

3. A molten salt heat storage system based on electricity price regulation according to claim 1, characterized in that: The heat exchanger (4) comprises an upper chamber and a lower chamber, the upper chamber being a steam chamber and the lower chamber being a molten salt chamber, and the two are separated by a heat exchange wall, and the molten salt transfers heat to the steam through the heat exchange wall.

4. A molten salt heat storage system based on electricity price regulation according to claim 1, characterized in that: The molten salt storage tank (1) is made of high temperature resistant metal material, which can withstand the high temperature environment of the molten salt, and is provided with a thermometer, a pressure gauge and a timer switch.

5. The molten salt heat storage system based on electricity price regulation according to claim 1 is characterized in that: The first circulation pump (3), the second circulation pump (7) and the third circulation pump (12) are respectively provided with a first valve (4), a second valve (8) and a third valve (13).

6. A molten salt heat storage system based on electricity price regulation according to claim 1, characterized in that: The molten salt pipeline (17) is provided with a first electric valve (5) and a second electric valve (9); the first electric valve (5) is arranged on the molten salt pipeline (16) between the first circulation pump (3) and the heat exchanger (6); and the second electric valve (9) is arranged on the molten salt pipeline (17) between the second circulation pump (7) and the molten salt storage tank (1).

7. The molten salt heat storage system based on electricity price regulation according to claim 1 is characterized in that: A third electric valve (10) and a fourth electric valve (11) are arranged on the steam pipeline (18); the third electric valve (10) is arranged on the steam pipeline (17) between the heat exchanger (6) and the fourth electric valve (11); and the fourth electric valve (11) is arranged on the steam pipeline (18) between the third electric valve (10) and the third circulation pump (12).

8. A molten salt heat storage system control method, used to control a molten salt heat storage system based on electricity price regulation according to any one of claims 5 to 7, comprising: During the low electricity price period, the electric heater (2) is turned on to heat the molten salt for heat storage, and the first circulation pump (3), the second electric valve (9), the heat exchanger (6), the second circulation pump (7), and the third circulation pump (12) are turned off; During the peak electricity price period, the electric heater (2) is turned off, and the first circulation pump (3), the second electric valve (9), the heat exchanger (6), the second circulation pump (7), and the third circulation pump (12) are turned on. The high-temperature molten salt enters the heat exchanger (6) to transfer heat to the steam, and the steam enters the steam pipe (18) to provide energy supply for the screw extruder (14) and the spinning machine (15).

9. According to the control method of a molten salt heat storage system according to claim 8, the electric heater (2) continuously heats the molten salt by converting electrical energy into thermal energy.

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