Heat storage and release system of electrode steam boiler
By installing pressure-stabilizing and constant-pressure regulating valves on the output and supply pipelines of the electrode steam boiler, the problem of unstable gas pressure in the electrode steam boiler was solved, and the stable connection and smooth operation of the pipeline system were improved.
Patent Information
- Application Number
- CN202423058119.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-11
AI Technical Summary
In the existing technology, the gas supply pipeline of the electrode steam boiler and the heat release pipeline of the steam accumulator are connected to the user end separately, which is not conducive to regulating the gas pressure in the pipeline system, resulting in poor operation stability of the electrode steam boiler.
Pressure stabilizing valves and constant pressure regulating valves are installed on the output pipeline and the gas supply pipeline respectively. By adjusting the steam flow rate and direction, the gas pressure in the pipeline system is kept stable, the connection pipeline is simplified, and the smoothness of operation is improved.
By using pressure stabilizing and constant pressure regulating valves, the steam supply pressure of the electrode steam boiler is stabilized, pipeline connections are simplified, laying costs are reduced, and the operational stability of the electrode steam boiler is improved.
Smart Images
Figure CN223538157U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electrode boiler technology, and in particular to an electrode steam boiler heat storage and release system. Background Technology
[0002] An electrode steam boiler is a device that directly heats water using electrical energy. The electric current generates resistance heat in the water, rapidly converting electrical energy into heat energy, thus achieving rapid water heating and efficient steam generation. Its working principle is primarily based on the resistance heating principle of water, utilizing the high thermal resistance of water to convert electrical energy into heat energy and generate steam. Compared to traditional coal-fired and oil-fired boilers, electrode steam boilers avoid the emission of harmful gases such as nitrogen oxides and sulfur oxides, as well as particulate matter, produced during combustion, reducing environmental pollution. Therefore, electrode steam boilers are widely used in factory heating, hot water supply, and steam production.
[0003] In most regions, large industrial electricity users are subject to peak-valley electricity pricing policies, with significant price differences between peak and valley periods. Electricity prices vary at different times of the day, resulting in substantial differences in the operating costs of electrode steam boilers at different times of the day. To reduce the operating costs of electrode steam boilers, existing technologies typically employ direct supply and storage of electricity during off-peak hours. Since off-peak electricity prices are relatively low, this can significantly reduce users' electricity expenses and save costs.
[0004] Chinese invention patent application CN1314718114A, published on June 14, 2020, discloses a steam energy storage system utilizing off-peak electricity for heat storage. This system includes an electric steam boiler and a steam accumulator. The electric steam boiler is connected to two pipelines: one is a direct steam supply pipeline for directly supplying steam to the user, and the other is a heat storage pipeline connecting the electric steam boiler and the steam accumulator. The heat storage pipeline is equipped with a heat storage pipeline electric valve to control the on / off state of steam storage, and a heat storage pipeline check valve to prevent steam from flowing from the steam accumulator to the electric steam boiler. The end of the heat storage pipeline is connected to a steam distribution pipeline inside the steam accumulator, and a heating pipe is connected to the steam distribution pipeline. The steam accumulator is connected to four pipelines: a heat storage pipeline, a pipeline for supplying the steam stored in the steam accumulator, and a pipeline for supplying the steam stored in the steam accumulator. The system includes heat release pipelines, water supply pipelines, and drainage pipelines for users; a level transmitter is installed along the water level of the steam accumulator; the heat release pipelines are equipped with a heat release pipeline check valve to prevent steam backflow in the venting pipeline, an electric regulating valve to control the on / off flow of steam in the venting pipeline, a steam-water separator, and a pressure transmitter connected at one end to the junction of the electric regulating valve and the steam-water separator, and at the other end connected to the electric regulating valve via an electrical circuit to transmit a pressure signal; the water supply pipeline is equipped with a water supply pipeline electric valve connected to the level transmitter via an electrical circuit and a water supply pump connected to the water supply pipeline electric valve; the drainage pipeline is equipped with a drainage pipeline electric valve connected to the level transmitter via an electrical circuit. The steam produced by the electric steam boiler in the steam energy storage system utilizing off-peak electricity for heat storage in this application is directly supplied to users or stored through direct gas supply pipelines and heat storage pipelines. The steam entering the steam accumulator through the heat storage pipeline is supplied to the user end through the heat release pipeline. All of the above pipelines are single-line connections to the equipment, which is not conducive to regulating the gas pressure in the pipeline system and affects the stable operation of the electrode steam boiler. Utility Model Content
[0005] The purpose of this utility model is to provide an electrode steam boiler heat storage and release system to solve the problem that in the prior art, the gas supply pipeline of the electrode steam boiler and the heat release pipeline of the steam accumulator are connected to the user end separately, which is not conducive to regulating the gas pressure in the pipeline system and results in poor operation stability of the electrode steam boiler.
[0006] To solve the above problems, the electrode steam boiler heat storage and release system of this utility model adopts the following technical solution:
[0007] An electrode steam boiler heat storage and release system includes an electrode steam boiler and a steam accumulator. The electrode steam boiler is connected to an output pipeline, and a pressure regulating valve is provided on the output pipeline to maintain the stability of the steam supply pressure of the electrode steam boiler. The end of the output pipeline far from the electrode steam boiler is connected to a parallel gas supply pipeline and a heat storage pipeline, which are connected downstream of the pressure regulating valve. The heat storage pipeline is connected to the steam accumulator through parallel heat storage pipeline and heat release pipeline. A constant pressure regulating valve is provided on the gas supply pipeline to maintain the stability of low-pressure steam output.
[0008] Furthermore, the steam accumulator is equipped with a heat charging device connected to the heat storage pipeline, and the heat charging device includes a steam distribution pipeline.
[0009] Furthermore, the lower part of the outer cylinder of the electrode steam boiler is connected to a self-circulating loop, and a boiler circulation pump is provided on the self-circulating loop to inject the boiler water in the lower part of the outer cylinder into the boiler.
[0010] Furthermore, a tap water pretreatment device is provided upstream of the electrode steam boiler to remove impurities from the water entering the electrode steam boiler.
[0011] Furthermore, the tap water pretreatment device includes a filter, a water softener, a softened water tank, a two-stage reverse osmosis device, and a pure water tank, which are connected in sequence.
[0012] Furthermore, a thermal deaerator is provided between the tap water pretreatment device and the electrode steam boiler. The thermal deaerator is connected to the electrode steam boiler through an inlet pipe, and a boiler feed water pump is provided on the inlet pipe. The thermal deaerator includes a thermal deaerator and a deaerator water pump.
[0013] Furthermore, a steam pipeline from the electrode steam boiler to the thermal deaerator is provided between the electrode steam boiler and the thermal deaerator, and a regulating valve is provided on the steam pipeline.
[0014] Furthermore, the thermal deaerator is connected to a condensate tank via a condensate pump.
[0015] Beneficial Effects: This invention relates to an improved electrode steam boiler heat storage and release system. Through this system, steam produced by the electrode steam boiler can flow through the output pipeline to the gas supply pipeline for supply to users and the heat storage pipeline for storage in the steam accumulator. A pressure-stabilizing valve on the output pipeline maintains stable steam supply pressure from the electrode steam boiler. The gas supply pipeline and the heat storage pipeline are connected downstream of the pressure-stabilizing valve, allowing steam stored in the steam accumulator to be supplied to users through the gas supply pipeline. A constant-pressure regulating valve on the output pipeline of the gas supply pipeline maintains stable low-pressure steam output. The interconnected output, gas supply, and heat storage pipelines of this electrode steam boiler heat storage and release system simplify the connection pipelines between the electrode steam boiler, the steam accumulator, and the user, reducing pipeline laying costs. The pressure-stabilizing and constant-pressure regulating valves allow adjustment of the flow rate and direction of steam produced by the electrode steam boiler according to user demand, balancing the gas pressure within the pipelines and improving the stability of the electrode steam boiler's operation. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the process flow of one embodiment of the electrode steam boiler heat storage and release system of this utility model;
[0017] In the diagram: 1. Electrode steam boiler; 2. Steam accumulator; 3. Output pipeline; 4. Gas supply pipeline; 5. Heat storage pipeline; 6. Pressure regulating valve; 7. Constant pressure regulating valve; 8. Heat storage pipeline; 9. Heat release pipeline; 10. Steam distribution pipe; 11. Self-circulating loop; 12. Boiler circulating pump; 13. Quartz sand filter; 14. Activated carbon filter; 15. Water softener; 16. Softened water tank; 17. Two-stage reverse osmosis unit; 18. Pure water tank; 19. Inlet pipeline; 20. Boiler feed water pump; 21. Thermal deaerator; 22. Deaeration water pump; 23. Steam pipeline; 24. Regulating valve; 25. Condensate pump; 26. Condensate tank. Detailed Implementation
[0018] The features and performance of this utility model will be further described in detail below with reference to the embodiments.
[0019] The electrode steam boiler heat storage and release system of this utility model utilizes the principle that the flow rate is proportional to the pressure difference between the two ends of the pipeline. A pressure stabilizing regulating valve and a constant pressure regulating valve are respectively installed in the output pipeline and the gas supply pipeline. The flow rate and direction of the steam produced by the electrode steam boiler can be adjusted according to the user's demand to maintain the gas pressure stability in the pipeline system.
[0020] As a basic solution, the electrode steam boiler 1 heat storage and release system of this utility model includes an electrode steam boiler 1 and a steam accumulator 2. The electrode steam boiler 1 produces steam which flows to the gas supply pipeline 4 through the output pipeline 3 to supply the user. The steam accumulator 2 has a steam charging and releasing function. It stores the steam produced by the electrode steam boiler 1 during off-peak hours through the heat storage pipeline 5, and supplies the stored steam to the user through the heat storage pipeline 5 to the gas supply pipeline 4 during peak hours. The use of the electrode steam boiler 1 in conjunction with the steam accumulator 2 can significantly reduce operating costs. A pressure regulating valve 6 is installed on the output pipeline 3 to maintain the stability of the steam supply pressure of the electrode steam boiler 1. Specifically, when the steam supply pressure of the electrode steam boiler 1 is greater than the set value, i.e., when there is user demand, the pressure regulating valve 6 opens. The greater the increase in the steam supply pressure of the electrode steam boiler 1, the greater the pressure difference across the pressure regulating valve 6, and the wider the opening of the pressure regulating valve 6. Conversely, when the steam supply pressure of the electrode steam boiler 1 is less than the set value, i.e., when user demand decreases or the storage capacity of the steam accumulator 2 is supplied to the user, the pressure regulating valve 6 closes to maintain the stability of the steam supply pressure of the electrode steam boiler 1. The gas supply pipeline 4 and the heat storage pipeline 5 are connected downstream of the pressure regulating valve 6. The electrode steam boiler 1, the steam accumulator 2, and the user end are connected through the output pipeline 3, the gas supply pipeline 4, and the heat storage pipeline 5, reducing the pipeline layout and facilitating the balancing of gas pressure within the pipeline system. A constant pressure regulating valve 7 is installed on the gas supply pipeline 4 to maintain a stable low-pressure steam output. Specifically, when the low-pressure steam consumption increases, i.e., the user demand increases, the pipeline pressure begins to drop, and the constant pressure regulating valve 7 opens wider; conversely, when the low-pressure steam consumption decreases, i.e., the user demand decreases, the pipeline pressure begins to rise, and the constant pressure regulating valve 7 closes, so that the steam pressure is always maintained at the set value. The heat storage pipeline 5 is connected to the steam accumulator through parallel heat storage and heat release pipelines. The heat storage pipeline extends into the steam accumulator, injecting steam into the saturated hot water filled inside the steam accumulator. The heat release pipeline is connected to the surface of the steam accumulator. When the steam accumulator releases heat, the heat release pipeline transports the steam from the upper layer inside the steam accumulator to the gas supply pipeline for supply to the user.
[0021] In use, the saturated hot water inside the steam accumulator typically occupies 60% to 90% of its internal volume. As a preferred embodiment, the steam accumulator 2 in the electrode steam boiler 1 heat storage and release system of this invention is filled with saturated hot water, occupying 85% of its internal volume. The remaining 15% of the space above the water surface is used for steam storage and flow. A heat-charging device is installed in the water space. A high water level allows for better absorption and storage of steam heat energy, ensuring heat exchange efficiency while also considering equipment stability and safety. The heat-charging device specifically includes a steam distribution pipe 10. Steam stored in the steam accumulator 2 is injected into the accumulator 2 through the steam distribution pipe 10. This steam mixes with the saturated hot water inside the accumulator 2, condensing into water and releasing a large amount of heat energy, causing the water temperature to rise. At this point, the steam accumulator 2 stores a large amount of heat energy. When the pressure inside the steam accumulator 2 continues to rise to the rated pressure, the steam accumulator 2 stops storing heat.
[0022] In a preferred embodiment, the lower part of the outer cylinder of the electrode steam boiler 1 is connected to a self-circulating loop 11, and a boiler circulation pump 12 is installed on the self-circulating loop 11 to inject boiler water from the lower part of the outer cylinder into the boiler. Driven by the boiler circulation pump 12, the self-circulating loop 11 causes the boiler water to circulate inside and outside the electrode steam boiler 1. This circulation helps to evenly heat the boiler water, improve heat exchange efficiency, and reduce heat loss. Simultaneously, the self-circulating loop 11 also helps to prevent localized overheating or scaling of the boiler water, thereby extending the service life of the boiler.
[0023] In a preferred embodiment, a tap water pretreatment device is provided upstream of the electrode steam boiler 1 to remove impurities from the water entering the electrode steam boiler 1. The tap water pretreatment device filters, removes impurities, and softens the tap water to make it pure water, which is then injected into the electrode steam boiler 1 to avoid the formation of scale inside the boiler due to excessively hard water, which would reduce the boiler's thermal efficiency and prevent excessive impurities in the water from clogging the electrode holes and affecting the normal operation of the boiler.
[0024] In a preferred embodiment, the tap water pretreatment device includes a filter, a water softener 15, a softened water tank 16, a dual-stage reverse osmosis device 17, and a pure water tank 18, which are connected sequentially. The filter is used to filter and adsorb impurities in the water. In specific implementations, a quartz sand filter 13 and an activated carbon filter 14 can be selected to adsorb suspended solids, silt, microorganisms, heavy metal ions, and organic matter, respectively. The tap water after impurity removal enters the water softener 15 to further remove calcium and magnesium ions, reducing water hardness and forming soft water. The soft water then enters the dual-stage reverse osmosis device 17. The dual-stage reverse osmosis device 17 includes a primary reverse osmosis system and a secondary reverse osmosis system. The reverse osmosis membrane in the primary system has a high removal rate for salts, organic matter, and microorganisms in the water, providing initial purification. The secondary reverse osmosis system further removes impurities and organic matter from the primary reverse osmosis product water, producing high-purity water.
[0025] In a preferred embodiment, a thermal deaerator is provided between the tap water pretreatment device and the electrode steam boiler 1. The thermal deaerator is connected to the electrode steam boiler 1 via an inlet pipe 19, and a boiler feed water pump 20 is provided on the inlet pipe 19 to control the amount of saturated hot water entering the electrode steam boiler 1. The thermal deaerator includes a thermal deaerator 21 and a deaerator pump 22. The thermal deaerator 21 achieves deaeration by heating the water to release dissolved gases. The deaerator pump 22 controls the flow rate of pure water entering the thermal deaerator 21 to avoid affecting the deaeration effect of the thermal deaerator 21 due to excessive or insufficient pure water entering the thermal deaerator 21.
[0026] In a preferred embodiment, a steam pipeline 23 is installed between the electrode steam boiler 1 and the thermal deaerator 21, connecting the electrode steam boiler 1 to the thermal deaerator 21. A portion of the steam produced by the electrode steam boiler 1 is fed back to the thermal deaerator 21 via the steam pipeline 23. The thermal deaerator 21 heats pure water to remove dissolved oxygen, eliminating the need for a separate heating device for the thermal deaerator 21 and reducing production costs. The steam pipeline 23 forms a circulation loop with the existing water inlet pipeline 19 from the thermal deaerator 21 to the electrode steam boiler 1. A regulating valve 24 is installed on the steam pipeline 23 to regulate the amount of steam entering the thermal deaerator 21 for thermal deoxygenation.
[0027] In a preferred embodiment, the thermal deaerator 21 is connected to a condensate tank 26 via a condensate pump 25. The condensate in the condensate tank is typically at a high temperature, close to saturation. Introducing the condensate into the thermal deaerator 21 rapidly heats the feedwater, causing dissolved oxygen to escape more quickly, thereby improving deaeration efficiency. Because the condensate has a low dissolved oxygen content, it reduces the dissolved oxygen content in the feedwater, thus enhancing the deaeration effect.
[0028] The specific working process of this embodiment is as follows: Figure 1 As shown, tap water flows sequentially through a quartz sand filter 13 and an activated carbon filter 14 to remove impurities and ions. It then enters a salt-added water softener 15 to form soft water. The soft water then passes through a two-stage reverse osmosis device 17 to further purify the water and form pure water. The pure water is stored in a pure water tank 18. During production, it enters a thermal deaerator 21 via a deaerator pump 22. The pure water is heated in the thermal deaerator 21 to further remove dissolved oxygen and form saturated hot water. It then enters the lower part of the boiler outer cylinder via a boiler feed pump 20. When the electrode steam boiler 1 is working, the boiler water in the lower part of the boiler outer cylinder enters the heating device inside the boiler via a boiler circulation pump 12 to generate steam. The steam flows through the output pipeline 3, through the pressure regulating valve 6, into the gas supply pipeline 4, and through the constant pressure regulating valve 7 to supply the user or through the heat storage pipeline 5 to the steam accumulator 2 for storage.
[0029] In this embodiment, the specific adjustment process of the pressure regulating valve 6 is as follows: When the user's steam consumption is zero, the constant pressure regulating valve 7 is closed, and the pressure regulating valve 6 is open. After passing through the pressure regulating valve 6, the steam is entirely stored in the steam accumulator 2. When the user's steam consumption is equal to the steam output of the electrode steam boiler 1, the pressure regulating valve 6 and the constant pressure regulating valve 7 are opened at the same angle. After passing through the pressure regulating valve 6, the steam is directly output from the constant pressure regulating valve 7. When the user's steam consumption is greater than the steam output of the electrode steam boiler 1, the constant pressure regulating valve 7 is opened to a greater extent than the pressure regulating valve 6. After passing through the pressure regulating valve 6, the steam is directly output to the constant pressure regulating valve 7. Because the steam production of electrode steam boiler 1 is insufficient, the remaining steam is supplemented by steam accumulator 2. When the user's steam consumption is less than the steam production of electrode steam boiler 1, the opening angle of constant pressure regulating valve 7 is less than that of pressure regulating valve 6. After passing through pressure regulating valve 6, some steam is directly output to constant pressure regulating valve 7, and the excess steam is stored in steam accumulator 2. When the boiler's steam production is zero, constant pressure regulating valve 7 is opened and pressure regulating valve 6 is closed, and all the user's steam consumption is provided by steam accumulator 2.
[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.
Claims
1. An electrode steam boiler heat storage and release system, comprising an electrode steam boiler and a steam accumulator, characterized in that, The electrode steam boiler is connected to an output pipeline, which is equipped with a pressure regulating valve to maintain a stable steam supply pressure. The output pipeline, at the end far from the electrode steam boiler, is connected to a parallel gas supply pipeline and a heat storage pipeline, which are connected downstream of the pressure regulating valve. The heat storage pipeline is connected to a steam accumulator through parallel heat storage and heat release pipelines. The gas supply pipeline is equipped with a constant pressure regulating valve to maintain a stable low-pressure steam output.
2. The electrode steam boiler heat storage and release system according to claim 1, characterized in that, The steam accumulator is equipped with a heat charging device connected to the heat storage pipeline, and the heat charging device includes a steam distribution pipeline.
3. The electrode steam boiler heat storage and release system according to claim 1, characterized in that, The lower part of the outer cylinder of the electrode steam boiler is connected to a self-circulating loop, and a boiler circulation pump is provided on the self-circulating loop to inject the boiler water in the lower part of the outer cylinder into the boiler.
4. The electrode steam boiler heat storage and release system according to any one of claims 1-3, characterized in that, The upstream of the electrode steam boiler is equipped with a tap water pretreatment device to remove impurities from the water entering the electrode steam boiler.
5. The electrode steam boiler heat storage and release system according to claim 4, characterized in that, The tap water pretreatment device includes a filter, a water softener, a softened water tank, a two-stage reverse osmosis device, and a pure water tank, which are connected in sequence.
6. The electrode steam boiler heat storage and release system according to claim 5, characterized in that, A thermal deaerator is provided between the tap water pretreatment device and the electrode steam boiler. The thermal deaerator is connected to the electrode steam boiler through an inlet pipe, and a boiler feed water pump is provided on the inlet pipe. The thermal deaerator includes a thermal deaerator and a deaerator water pump.
7. The electrode steam boiler heat storage and release system according to claim 6, characterized in that, A steam pipeline from the electrode steam boiler to the thermal deaerator is provided between the electrode steam boiler and the thermal deaerator, and a regulating valve is provided on the steam pipeline.
8. The electrode steam boiler heat storage and release system according to claim 7, characterized in that, The thermal deaerator is connected to a condensate tank via a condensate pump.