High-temperature heat storage type industrial steam generation system

Abstract

The utility model discloses a high-temperature heat storage type industrial steam generation system, which relates to the technical field of steam supply and comprises a steam unit and a high-temperature heat storage unit. And the steam unit realizes steam generation, use and cyclic utilization. In the high-temperature heat storage unit, a high-temperature heat storage body comprises a heat storage channel and a heat taking channel, an electric heating wire is arranged in the heat storage channel and is connected with an electric heating temperature controller, and a fan and the like form a gas medium circulation channel. In the off-peak electricity period, the heating wire heats the high-temperature heat storage body through electric energy and stores heat energy. In the peak period, the stored heat energy is released to supply energy to the steam generator to generate steam. The system is further provided with a frequency conversion controller to regulate and control the fan, inert gas is adopted as a gas medium, and the high-temperature heat storage body is wrapped by an asbestos heat preservation plate. The system can provide steam for industrial production in an economical, feasible and stable operation mode by utilizing the peak-valley price difference.

Description

Technical Field

[0001] This utility model relates to the field of steam supply technology, and in particular to a high-temperature thermal storage industrial steam generation system. Background Technology

[0002] Industrial steam is a crucial energy source in numerous industrial sectors, such as chemical, textile, and food processing, and is widely used in various production processes including heating, cooking, drying, and driving machinery. Its stable supply plays a key role in ensuring the continuity of industrial production and product quality. With the continuous development of industry, the demand for industrial steam is showing a sustained upward trend.

[0003] Traditional industrial steam generation primarily relies on the direct combustion of fossil fuels (such as coal and natural gas) or the immediate conversion of energy into steam using equipment like electric boilers. However, these traditional methods have numerous limitations. For fossil fuel combustion, on the one hand, it faces increasing environmental pressure, producing large amounts of pollutants such as sulfur dioxide, nitrogen oxides, and particulate matter, causing severe environmental pollution and failing to meet modern society's requirements for green and environmentally friendly production. On the other hand, fossil fuel prices fluctuate significantly, influenced by factors such as the international energy market, making it difficult to control the stable production costs of industrial steam and posing certain economic risks to businesses. While using electric boilers to generate steam on-the-spot is relatively cleaner, it suffers from low energy efficiency. Especially during peak electricity consumption periods, when power supply is tight and electricity prices are relatively high, operating electric boilers at these times leads to a significant increase in steam production costs, increasing the company's operating costs.

[0004] To optimize the allocation of electricity resources and improve the overall operating efficiency of the power system, many regions have implemented peak-valley electricity pricing policies. This policy divides the daily electricity consumption into peak and off-peak periods, with different pricing standards applied to different periods. Typically, off-peak electricity prices are significantly lower than peak-peak prices. This policy provides industrial enterprises with an opportunity to reduce production costs by rationally utilizing the price difference. However, to fully utilize the peak-valley price difference, an effective energy storage method is needed to store electrical energy in some form during off-peak periods and then release the stored energy and convert it into industrial steam during peak periods, thereby reducing steam production costs. However, most existing industrial steam generation systems currently lack such an efficient energy storage and conversion mechanism that is closely integrated with peak-valley electricity pricing policies.

[0005] In summary, existing steam generation methods in the field of industrial steam generation have many problems, including environmental protection, cost control, and energy efficiency, and have failed to make full use of peak-valley electricity price differences to achieve economical and efficient steam supply. Utility Model Content

[0006] The purpose of this invention is to provide a high-temperature thermal storage industrial steam generation system to solve the problems existing in the prior art, and to provide industrial steam to users in an economical, feasible and stable manner by utilizing the peak-valley electricity price difference.

[0007] To achieve the above objectives, this utility model provides the following solution:

[0008] This utility model provides a high-temperature thermal storage industrial steam generation system, comprising:

[0009] The steam unit includes a steam generator, steam-using equipment, a condenser, a water tank, a first water pump, and a second water pump. The steam inlet of the steam-using equipment is connected to the steam outlet of the steam generator, the steam inlet of the condenser is connected to the steam outlet of the steam-using equipment, the water tank is connected to the water outlet of the condenser, the water inlet of the first water pump is connected to the water tank, the water outlets of the first water pump and the second water pump are respectively connected to the water inlet of the steam generator, and the water inlet of the second water pump is connected to the boiler outlet.

[0010] A high-temperature thermal storage unit includes a high-temperature thermal storage body, an electric heating temperature controller, a fan, an air inlet pipe, an air supply pipe, and an air return pipe. The high-temperature thermal storage body is a metal block, and it contains a thermal storage channel and several heat extraction channels. Several heating wires, each electrically connected to the electric heating temperature controller, are installed in the thermal storage channel, with the heating wires in close contact with the inner wall of the thermal storage channel. The electric heating temperature controller is electrically connected to the power distribution network and controls the heating wires to heat the high-temperature thermal storage body to a set temperature. The air inlet end of the air inlet pipe is connected to the... The outlet of the blower is connected, one end of each heat extraction channel is connected to the outlet of the inlet pipe, and the other end of each heat extraction channel is connected to the inlet of the supply pipe. The outlet of the supply pipe is connected to the heat medium inlet of the steam generator, the heat medium outlet of the steam generator is connected to the inlet of the return pipe, and the outlet of the return pipe is connected to the inlet of the blower. A gaseous medium flows through the circulation path formed by the blower, the inlet pipe, the heat extraction channel, the supply pipe, the heat medium channel of the steam generator, and the return pipe.

[0011] Preferably, the high-temperature heat storage device is externally wrapped with an insulation board.

[0012] Preferably, the system also includes a frequency converter, which is electrically connected to the motor of the fan and is used to control the operation of the fan motor.

[0013] Preferably, the gas medium is an inert gas.

[0014] Preferably, the heating wire is embedded in the inner wall of the heat storage channel.

[0015] Preferably, the high-temperature heat storage body is rectangular.

[0016] Preferably, the heat storage channel is located in the middle of the high-temperature heat storage body.

[0017] Preferably, the number of heat storage channels is one, and the number of heat extraction channels is divided into two groups and distributed on both sides of the heat extraction channels.

[0018] Preferably, the high-temperature heat storage body is made of cast iron.

[0019] Preferably, the insulation board is made of asbestos.

[0020] The present invention achieves the following technical advantages over the prior art:

[0021] This utility model's high-temperature thermal storage industrial steam generation system utilizes the peak-valley electricity price difference to achieve efficient heat utilization and reduce the operating cost of the industrial steam generation system. Compared with conventional steam generation systems, it reduces operating costs by more than 15%.

[0022] Furthermore, the material of the high-temperature heat storage body in this utility model is cast iron, and the thermal conductivity of the high-temperature heat storage body is greater than 50W / (m·K). The high thermal conductivity enhances the heat transfer effect, accelerates the heat storage and heat release rate, and results in a shorter unit start-up time and lower energy consumption. The high-temperature heat storage body has a high temperature resistance of not less than 800℃ and can provide industrial high-temperature steam at a temperature of not less than 400℃~500℃.

[0023] Furthermore, the high-temperature thermal storage industrial steam generation system of this invention has a high electrothermal conversion efficiency of not less than 90%, and can realize large-scale heat storage and release. In non-thermal storage state, it can achieve full-load operation for 10 hours or more. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the high-temperature thermal storage industrial steam generation system of this utility model.

[0026] Figure 2 This is a schematic diagram of the high-temperature heat storage body in this utility model;

[0027] In the diagram: 1. High-temperature heat storage body; 2. Electric heating thermostat; 3. Power distribution network; 4. Fan; 5. Motor; 6. Variable frequency controller; 7. Steam generator; 8. Steam-using equipment; 9. Condenser; 10. Water tank; 11. First water pump; 12. Second water pump; 13. Second valve; 14. First valve; 15. Inlet pipe; 16. Supply pipe; 17. Return pipe; 18. Heat extraction channel; 19. Heat storage channel. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] The purpose of this invention is to provide a high-temperature thermal storage industrial steam generation system to solve the problems existing in the prior art, and to provide industrial steam to users in an economical, feasible and stable manner by utilizing the peak-valley electricity price difference.

[0030] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figures 1 to 2 As shown, this embodiment provides a high-temperature thermal storage industrial steam generation system, including:

[0032] The steam unit includes a steam generator 7, a steam-using device 8, a condenser 9, a water tank 10, a first water pump 11, and a second water pump 12. The steam inlet of the steam-using device 8 is connected to the steam outlet of the steam generator 7, the steam inlet of the condenser 9 is connected to the steam outlet of the steam-using device 8, the water tank 10 is connected to the water outlet of the condenser 9, the water inlet of the first water pump 11 is connected to the water tank 10, the water outlet of the first water pump 11 and the water outlet of the second water pump 12 are respectively connected to the water inlet of the steam generator 7, and the water inlet of the second water pump 12 is connected to the boiler outlet.

[0033] The high-temperature thermal storage unit includes a high-temperature thermal storage body 1, an electric heating thermostat 2, a fan 4, an air inlet pipe 15, an air supply pipe 16, and an air return pipe 17. The high-temperature thermal storage body 1 is a metal block, and it is equipped with a thermal storage channel 19 and several heat extraction channels 18. Several heating wires, each electrically connected to the electric heating thermostat 2, are installed in the thermal storage channel 19, with the heating wires in close contact with the inner wall of the thermal storage channel 19. The electric heating thermostat 2 is electrically connected to the power distribution network 3 and is used to control the heating wires to heat the high-temperature thermal storage body 1 to a set temperature. The air inlet pipe 15... The air outlet of the fan 4 is connected to the air outlet of the fan 4. One end of each heat extraction channel 18 is connected to the air outlet of the air inlet pipe 15, and the other end of each heat extraction channel 18 is connected to the air inlet of the air supply pipe 16. The air outlet of the air supply pipe 16 is connected to the heat medium inlet of the steam generator 7. The heat medium outlet of the steam generator 7 is connected to the air inlet of the return pipe 17. The air outlet of the return pipe 17 is connected to the air inlet of the fan 4. The gas medium flows in the circulation path composed of the fan 4, the air inlet pipe 15, the heat extraction channel 18, the air supply pipe 16, the heat medium channel of the steam generator 7, and the return pipe 17.

[0034] In the optional schemes of this embodiment, it is more preferred that the high-temperature heat storage body 1 is wrapped with an insulation board. The insulation board needs to be heat-resistant, and the preferred material for the insulation board is asbestos. Of course, other heat-resistant insulation materials can also be used to make the insulation board.

[0035] In the optional scheme of this embodiment, a more preferred option is to include a frequency converter 6, which is electrically connected to the motor 5 of the fan 4. The frequency converter 6 is used to control the operation of the motor 5 of the fan 4. The frequency converter 6, electrically connected to the motor 5 of the fan 4, can precisely control the speed of the motor 5 of the fan 4 according to the actual operating conditions of the system, such as the steam demand at different times and the heat extraction or heat storage state of the high-temperature heat storage body 1. When the steam demand is low, such as at night or during periods of relatively low steam consumption, the speed of the motor 5 of the fan 4 can be reduced by the frequency converter 6. At this time, the speed at which the fan 4 transports the gas medium (such as inert gas) is slowed down. While meeting the basic circulation requirements of the system, the energy consumption of the fan 4 can be reduced, because the energy consumption of the fan 4 is proportional to the cube of the speed, and reducing the speed can significantly reduce energy consumption. Conversely, during peak industrial production periods, the demand for steam increases significantly, requiring a faster heat extraction rate of the high-temperature heat storage body 1 to ensure that the steam generator 7 has a sufficient supply of heat medium to generate a large amount of steam. At this time, the frequency converter 6 can increase the speed of the fan 4 motor 5, so that the fan 4 can quickly transport the gas medium, accelerate the heat transfer between the heat extraction channel 18 and the steam generator 7, and ensure a stable supply of steam.

[0036] In the optional schemes of this embodiment, it is more preferred that the gas medium is an inert gas. Inert gases have extremely high chemical stability and are not prone to chemical reactions with the high-temperature heat storage body 1, the heating wire, the steam generator 7 and other related components during system operation.

[0037] In this embodiment, a preferred embodiment involves embedding the heating wire in the inner wall of the heat storage channel 19. Embedding the heating wire in the inner wall allows for close and large-area contact with the inner wall of the heat storage channel 19. When current passes through the heating wire and it heats up, the generated heat energy can be rapidly and directly conducted to the inner wall of the heat storage channel 19, and then transferred to the high-temperature heat storage body 1 for heat energy storage. Compared to simply placing the heating wire inside the heat storage channel 19, this close embedding method reduces the thermal resistance during heat transfer, allowing heat energy to be transferred from the heating wire to the heat storage channel 19 and the high-temperature heat storage body 1 with higher efficiency, thus improving the energy utilization efficiency of the entire heat storage process.

[0038] The specific structure of the high-temperature heat storage body 1 is as follows: the high-temperature heat storage body 1 is a cuboid; the heat storage channel 19 is located in the middle of the high-temperature heat storage body 1; there is one heat storage channel 19, and the heat extraction channel 18 is divided into two groups and distributed on both sides of the heat extraction channel 18; the material of the high-temperature heat storage body 1 is cast iron.

[0039] In addition, a first valve 14 is provided on the connecting pipeline between the first water pump 11 and the steam generator 7, and a second valve 13 is provided on the connecting pipeline between the second water pump 12 and the steam generator 7.

[0040] The working principle of the high-temperature thermal storage industrial steam generation system in this embodiment is as follows:

[0041] (1) Thermal storage process during off-peak electricity hours

[0042] During off-peak electricity hours, distribution network 3 supplies power to electric heating thermostat 2. Electric heating thermostat 2 is electrically connected to heating wire installed in the heat storage channel 19 of high-temperature heat storage body 1. When it receives electrical energy, the heating wire converts the electrical energy into heat energy. Since the heating wire is embedded in the inner wall of the heat storage channel 19, it can tightly and efficiently conduct the generated heat energy to the inner wall of the heat storage channel 19, and then transfer it to the high-temperature heat storage body 1.

[0043] At this point, the high-temperature heat storage body 1, acting as a carrier for heat energy storage, begins to absorb and store the heat energy transmitted from the heating wire. The high-temperature heat storage body 1 is made of steel, possessing a certain degree of high-temperature resistance and heat storage capacity, effectively preserving the heat energy converted from electrical energy.

[0044] (2) Steam generation process during peak hours

[0045] Heat release and steam generation:

[0046] During peak electricity consumption periods, the power supply to the heating wire is stopped, and the high-temperature heat storage body 1 begins to release the previously stored heat energy. The heat energy stored in the high-temperature heat storage body 1 is transferred to the steam generator 7 as a heat medium through components such as the heat extraction channel 18 and the gas supply pipe 16.

[0047] Specifically, the fan 4 starts operating under the control of the frequency converter 6. The fan 4's inlet draws in a gaseous medium (using inert gas), and its outlet delivers the gaseous medium through the inlet pipe 15 to one end of the heat extraction channel 18 of the high-temperature heat storage body 1. After entering the heat extraction channel 18, the gaseous medium flows within the channel and absorbs some of the heat emitted by the high-temperature heat storage body 1. Then, it enters the heat medium inlet of the steam generator 7 from the other end of the heat extraction channel 18 through the gas supply pipe 16. Inside the steam generator 7, the gaseous medium, acting as a heat medium, transfers the heat it carries to the water inside the steam generator 7, raising its temperature. Afterward, the gaseous medium returns from the heat medium outlet of the steam generator 7 to the inlet of the fan 4 through the return pipe 17, completing one cycle of the gaseous medium.

[0048] The circulation of the gaseous medium helps to distribute the heat energy stored in the high-temperature heat storage body 1 more evenly. The inlet of the steam generator 7 is connected to the outlet of the first water pump 11 and the outlet of the second water pump 12, respectively. The inlet of the first water pump 11 is connected to the water tank 10, and the inlet of the second water pump 12 is connected to the boiler outlet. Water in the water tank 10, under the action of the first water pump 11, and water that may come from the boiler outlet and be transported by the second water pump 12, enter the steam generator 7 together.

[0049] Inside the steam generator 7, the heat medium (i.e., the heat released from the high-temperature heat storage body 1 and transferred through the gas medium) heats the water entering through the inlet to the boiling point, causing it to vaporize into steam, and then outputs steam from the steam outlet of the steam generator 7.

[0050] Steam recycling:

[0051] The steam output from the steam generator 7 enters the steam-using equipment 8 to provide the steam power required for industrial production or for heating purposes. After the steam-using equipment 8 has finished using the steam, the discharged steam enters the condenser 9.

[0052] In the condenser 9, steam condenses into water upon cooling. This condensate flows back to the water tank 10 through the outlet, completing one cycle of steam utilization. The water in the water tank 10 can then re-enter the steam generator 7 under the action of the first water pump 11, where it is heated to generate new steam. This cycle repeats continuously to ensure a continuous demand for steam in industrial production processes.

[0053] (3) Control mechanism during system operation

[0054] Temperature control:

[0055] The electric heating thermostat 2 plays a crucial role in temperature control throughout the process. During off-peak electricity hours, when storing heat, the electric heating thermostat 2 controls the energization of the heating wire according to the set temperature. When the temperature of the high-temperature heat storage body 1 reaches the set temperature, the electric heating thermostat 2 cuts off the power supply to the heating wire, stopping heating and preventing the high-temperature heat storage body 1 from overheating; when the temperature drops below the set temperature, the power supply is restored, and heating continues.

[0056] In this way, the precise control of the electric heating temperature controller 2 ensures that the high-temperature heat storage body 1 can store heat energy within a suitable temperature range, which not only guarantees the heat storage effect but also ensures the safe operation of the system.

[0057] Fan speed control 4:

[0058] During peak hours, the speed of the fan 4 is adjusted according to the heat transfer medium demand of the steam generator 7 to ensure that sufficient heat energy is transferred from the high-temperature heat storage body 1 to the steam generator 7 to meet the steam generation requirements.

[0059] The high-temperature thermal storage industrial steam generation system in this embodiment, through ingenious design and the coordinated work of various components, makes full use of the peak-valley electricity price difference, realizing the functions of efficient thermal storage during off-peak hours and stable steam generation and recycling during peak hours. At the same time, the stable operation of the system is ensured through temperature control and fan speed regulation mechanisms.

[0060] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A high-temperature thermal storage industrial steam generation system, characterized in that, include: The steam unit includes a steam generator, steam-using equipment, a condenser, a water tank, a first water pump, and a second water pump. The steam inlet of the steam-using equipment is connected to the steam outlet of the steam generator, the steam inlet of the condenser is connected to the steam outlet of the steam-using equipment, the water tank is connected to the water outlet of the condenser, the water inlet of the first water pump is connected to the water tank, the water outlets of the first water pump and the second water pump are respectively connected to the water inlet of the steam generator, and the water inlet of the second water pump is connected to the boiler outlet. A high-temperature thermal storage unit includes a high-temperature thermal storage body, an electric heating temperature controller, a fan, an air inlet pipe, an air supply pipe, and an air return pipe. The high-temperature thermal storage body is a metal block, and it contains a thermal storage channel and several heat extraction channels. Several heating wires, each electrically connected to the electric heating temperature controller, are installed in the thermal storage channel, with the heating wires in close contact with the inner wall of the thermal storage channel. The electric heating temperature controller is electrically connected to the power distribution network and controls the heating wires to heat the high-temperature thermal storage body to a set temperature. The air inlet end of the air inlet pipe is connected to the... The outlet of the blower is connected, one end of each heat extraction channel is connected to the outlet of the inlet pipe, and the other end of each heat extraction channel is connected to the inlet of the supply pipe. The outlet of the supply pipe is connected to the heat medium inlet of the steam generator, the heat medium outlet of the steam generator is connected to the inlet of the return pipe, and the outlet of the return pipe is connected to the inlet of the blower. A gaseous medium flows through the circulation path formed by the blower, the inlet pipe, the heat extraction channel, the supply pipe, the heat medium channel of the steam generator, and the return pipe.

2. The high-temperature thermal storage industrial steam generation system according to claim 1, characterized in that: The high-temperature heat storage device is wrapped with an insulation board.

3. The high-temperature thermal storage industrial steam generation system according to claim 1, characterized in that: It also includes a frequency converter, which is electrically connected to the motor of the fan and is used to control the operation of the fan motor.

4. The high-temperature thermal storage industrial steam generation system according to claim 1, characterized in that: The gas medium is an inert gas.

5. The high-temperature thermal storage industrial steam generation system according to claim 1, characterized in that: The heating wire is embedded in the inner wall of the heat storage channel.

6. The high-temperature thermal storage industrial steam generation system according to claim 1, characterized in that: The high-temperature thermal storage body is rectangular.

7. The high-temperature thermal storage industrial steam generation system according to claim 1, characterized in that: The heat storage channel is located in the middle of the high-temperature heat storage body.

8. The high-temperature thermal storage industrial steam generation system according to claim 7, characterized in that: The number of heat storage channels is one, and the number of heat extraction channels is divided into two groups, which are distributed on both sides of the heat extraction channel.

9. The high-temperature thermal storage industrial steam generation system according to claim 1, characterized in that: The high-temperature heat storage body is made of cast iron.

10. The high-temperature thermal storage industrial steam generation system according to claim 2, characterized in that: The insulation board is made of asbestos.

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