LDR Electric Boilers electric tubes DN200X90MM 锅炉配件加热管
锅炉配件加热管 Flange‑type immersion heating element for electric steam boiler DN200X90MM
电蒸汽锅炉采用 锅炉配件加热管 electric boilers electric tubes，多根 U 型电热管焊接在一个圆形法兰盘上，整体插入炉胆。 内部：镍铬发热丝 + 氧化镁绝缘填充粉 外部：不锈钢护套管、锻打法兰，尺寸DN200x90 mm
- 锅炉配件加热管介绍electric boilers electric tubes
电加热蒸汽锅炉
一、工作原理
电流通入浸没在水中的锅炉配件加热管，电能转化为热能加热炉水；密闭承压炉胆内水温升高沸腾，水发生相变变成高温高压饱和蒸汽；经过汽水分离，干燥蒸汽从出汽口输出供给工艺设备；电控系统自动控制补水、加热、压力、水位，全自动启停。
- 额定压力常见：0.4‑1.6 MPa，对应饱和蒸汽温度 151‑204℃
- 蒸发量：50kg/h～4t/h（工业常用）
- 电源：380V 三相大功率供电
- 核心发热件：锅炉配件加热管，不可用热水锅炉加热管替代。蒸汽加热管表面热负荷4–6 W/cm²，水压试验3.0 MPa，承压法兰设计，适配沸腾相变、冷热交变工况。
I. Working Principle
Electric current is supplied to heating elements submerged in the boiler water, converting electrical energy into thermal energy to heat the water. As the water temperature rises within the sealed, pressurized vessel, the water boils and undergoes a phase change into high-temperature, high-pressure saturated steam. Following steam-water separation, dry steam is discharged through the outlet to supply process equipment. An electronic control system automatically manages water makeup, heating, pressure, and water levels, enabling fully automatic startup and shutdown.
- Common rated pressures: 0.4–1.6 MPa (corresponding to saturated steam temperatures of 151–204°C).
- Evaporation capacity: 50 kg/h to 4 t/h (common in industrial applications).
- Power supply: 380V three-phase high-power supply.
- Core heating component: Boiler-specific heating element (standard hot-water boiler heating elements cannot be used as substitutes).
- These steam heating elements feature a surface heat load of 4–6 W/cm², a hydrostatic test pressure of 3.0 MPa, and a pressure-resistant flange design, making them suitable for boiling phase-change processes and thermal cycling conditions.
二、锅炉关键部件-锅炉配件加热管
工况：炉内水沸腾汽化，带压（0.4‑1.6 MPa）、冷热交变。DN200X90 mm
1. 结构
形式：多组 U 型电热管焊接在锻打法兰盘，整体浸入炉胆水中
内部：镍铬发热丝/电阻丝 + 高纯度氧化镁绝缘粉护套：无缝不锈钢管SS304 或者SS316
外部：锻压法兰、接线盒、密封组件
II. Key Boiler Component: Heating Element
Operating Conditions: Water boils and vaporizes within the vessel; pressurized (0.4–1.6 MPa); subject to thermal cycling. Dimensions: DN200 x 90 mm
Structure
Internal Components: Nickel-chromium heating wire/resistance wire + high-purity magnesium oxide insulation powder. Sheath: Seamless stainless steel (SS304 or SS316).
External Components: Forged flange, terminal box, and sealing assembly.
锅炉配件加热管 组装过程
三、电蒸汽锅炉和常压电热水锅炉 电加热管 区别
III. Differences between electric steam boilers, atmospheric electric hot water boilers, and electric heating elements
1. 电加热蒸汽锅炉原理
电蒸汽锅炉加热管适配密闭承压、水汽相变沸腾工况，全程处于高压高温、冷热交变剧烈的严苛环境中。锅炉运行时炉水持续沸腾汽化，水温常年维持在150–204℃，工作压力可达0.4–1.6MPa，加热管表面时刻接触剧烈翻滚、汽化的高温高压水体，设备启停时会快速经历高温沸腾、低温补水的温度骤变，工况波动大、换热强度极高，对加热管的综合性能要求严苛。
1. Principles of Electric Steam Boilers
Heating elements for electric steam boilers are designed for pressurized, phase-change (boiling) operating conditions, functioning within a harsh environment characterized by high temperatures, high pressures, and rapid thermal cycling. During operation, the boiler water continuously boils and vaporizes; water temperatures are maintained between 150°C and 204°C, and operating pressures range from 0.4 to 1.6 MPa. The heating element surfaces are constantly exposed to violently churning, vaporizing, high-temperature, and high-pressure water. Furthermore, the equipment undergoes rapid temperature fluctuations—shifting between high-temperature boiling and low-temperature water replenishment—during startup and shutdown. These significant operational fluctuations and extremely high heat transfer intensities place rigorous demands on the overall performance of the heating elements.
2. 电加热热水锅炉原理
2. Principles of Electric Hot Water Boilers
3. 电加热管设计区别
表面热负荷与换热设计区别
3. Design Differences in Electric Heating Elements
Differences in Surface Heat Load and Heat Transfer Design
Heating elements for electric steam boilers are specifically designed to meet the high-intensity heat transfer demands associated with violent water boiling and vaporization. They feature a surface heat load of 4.0–6.0 W/cm², characterized by high heat load density and rapid heat transfer rates; this allows for the quick transfer of heat to the water, meeting the core requirement for instantaneous phase changes and continuous steam generation. Additionally, these parameters are optimized to withstand localized dry-heating and heat flux shocks during the boiling process, preventing heat accumulation and perfectly suiting the high-intensity, continuous heat transfer conditions of steam boilers. In contrast, heating elements for electric hot water boilers are designed for steady liquid-phase heat transfer scenarios that do not involve violent vaporization. They feature a lower surface heat load of 2.0–3.5 W/cm², resulting in a lower heat load density and a gentler, more stable heat transfer process. If a heating element designed for hot water is used in a steam boiler, an excessively low heat load prevents heat from dissipating rapidly from the tube wall; the element becomes enveloped in boiling steam, leading to rapid scale formation and heat accumulation, which quickly results in tube wall burnout or heating wire failure—this is the primary cause of damage resulting from such improper application.
护套材质与抗疲劳耐腐蚀性能区别
Heating elements for electric steam boilers utilize high-specification, heat- and pressure-resistant materials. Standard models typically employ seamless heat-resistant stainless steel tubing (grades SUS321, 316, or 304); for industrial applications involving poor water quality or high chloride ion content, the material is upgraded to 316L stainless steel, while Incoloy 800 specialty alloy is selected for high-pressure, rigorous operating conditions. These materials offer exceptional resistance to thermal fatigue, high-temperature steam corrosion, and thermal shock, enabling them to withstand the cyclic stresses of repeated boiling and rapid cooling over the long term without suffering from issues such as stress cracking or pitting perforation caused by frequent temperature fluctuations—thereby meeting the demands of continuous, long-term industrial boiler operation. In contrast, heating elements for electric hot water boilers adhere to lower material standards, typically utilizing standard welded stainless steel tubing for routine operating conditions.
承压结构与密封工艺区别
The heating elements for electric steam boilers are classified as pressure-bearing components for special equipment. They feature integrally forged high-pressure flanges and thickened tube walls; prior to delivery, they undergo high-pressure forging, non-destructive testing, and pressure-resistance testing, ensuring the overall structural strength meets manufacturing standards for pressure vessels. The sealing end employs a dual-insulation sealing process combining glass glaze and epoxy resin, paired with specialized high-temperature and high-pressure gaskets. This design withstands prolonged exposure to 1.6 MPa high-pressure steam, effectively preventing safety hazards such as high-pressure leakage, flange deformation, and tube-end cracking, making them suitable for the rigorous operating conditions of sealed, pressure-bearing boiler vessels. In contrast, the heating elements for electric hot water boilers feature a simpler structural design; atmospheric-pressure models typically utilize standard stamped flat flanges with thinner tube walls and lack high-pressure reinforcement. Their sealing relies solely on ordinary rubber gaskets, limiting their pressure tolerance to atmospheric levels or low pressures not exceeding 0.4 MPa.
4. 图纸设计的区别
Electric steam boilers: These are sealed, pressurized pieces of special equipment; they must be equipped with steam outlet valves and safety valves to ensure pressure safety.
Atmospheric electric hot water boilers: The boiler body is vented to the atmosphere and operates without pressure; therefore, it is not classified as special equipment. This is the fundamental difference between the two types of boilers, and it directly dictates the overall design logic of the equipment.
电蒸汽锅炉图纸设计Design of Electric Steam Boiler Drawings
电蒸汽锅炉 加热管与锅炉本体 组装过程
Assembly Process of Heating Elements and Boiler Body for Electric Steam Boilers
电加热 常压热水锅炉 图纸设计
Design Drawings for Electric-Heated Atmospheric Hot Water Boiler
电加热 承压热水锅炉 图纸与设计
炉体完全密闭、全程满水，没有汽空间；法兰电加热管把水加热，循环水泵驱动热水闭环循环。 依靠系统压力抑制水沸腾汽化，实现100℃以上高温液态热水输出，只利用水的显热换热，不发生水汽相变。
Drawings and Design of Pressurized Electric Hot Water Boilers
The boiler vessel is fully sealed and remains completely filled with water at all times, with no steam space; flanged electric heating elements heat the water, while a circulation pump drives the hot water through a closed-loop circuit. System pressure suppresses boiling and vaporization, enabling the output of high-temperature liquid hot water exceeding 100°C; heat exchange relies solely on the sensible heat of the water, without any phase change between liquid and vapor.
关于我们电加热蒸汽锅炉设计 符合以下 国家标准
1.本锅炉的设计、制造、验收、安装和使用必须按下列标准执行：
(1)TSG 11-2020《锅炉安全技术规程》;
(2)GB/T16508.1~16508.8-2022《锅壳锅炉》;
(3)NB/T47034-2021《工业锅炉技术条件》;
(4)GB50273-2022《锅炉安装工程施工及验收标准》;
(5)GB/T1576-2018《工业锅炉水质》;
(6)JB/T10393-2002《电加热锅炉技术条件》;
(7)TSG 91-2021《锅炉节能环保技术规程》;
(8)GB50056-1993《电热设备电力装置设计规范》;
1.The design, manufacture, inspection and acceptance, installation, and operation of this boiler must be carried out in accordance with the following standards:
(1) TSG 11-2020 “Boiler Safety Technical Regulation”;
(2) GB/T 16508.1~16508.8-2022 “Shell Boilers”;
(3) NB/T 47034-2021 “Technical Conditions for Industrial Boilers”;
(4) GB 50273-2022 “Code for Construction and Acceptance of Boiler Installation Engineering”;
(5) GB/T 1576-2018 “Water Quality for Industrial Boilers”;
(6) JB/T 10393-2002 “Technical Conditions for Electric Heating Boilers”;
(7) TSG 91-2021 “Boiler Energy Conservation and Environmental Protection Technical Regulation”;
(8) GB 50056-1993 “Code for Design of Electrical Installations for Electric Heating Equipment.”
2.电加热锅炉的金属管状电热元件应符合JB/T2379-2016《金属管状电热元件》的规定；本标准规定了对金属管状电热元件的各项要求。本标准适用于工作电压不超过440V，以金属管作为外壳的管状电热元件。 本标准不适用于日用和类似用途的管状电热元件。
2. The metal tubular electric heating elements for electric boilers shall comply with the provisions of JB/T 2379-2016 “Metal Tubular Electric Heating Elements.” This standard specifies the requirements for metal tubular electric heating elements. It applies to tubular electric heating elements with a metal tube as the outer casing and an operating voltage not exceeding 440 V. This standard does not apply to tubular electric heating elements intended for household and similar purposes.
3.本锅炉应有可靠的电气绝缘性能，设备中带电回路之间以及带电回路与地之间(导体与柜体之间及电热元件与壳体之间)的绝缘电阻应不小于1MΩ;锅炉及其动力柜、控制柜的金属壳体或可能带电的金属件与接地端之间应具有可靠的电气连接，其与接地端之间的连接电阻不得大于0.1Ω;本锅炉有足够的电气耐压强度，能承受冷态电压2000V和热态电压1000V、50Hz的1min耐压试验，无击穿或闪络现象。
3. The boiler shall have reliable electrical insulation performance. The insulation resistance between live circuits within the equipment, as well as between live circuits and ground (between conductors and cabinet body, and between heating elements and housing), shall not be less than 1 MΩ. The metal casing or any other metallic parts of the boiler, its power cabinet, and control cabinet that may become energized must have a reliable electrical connection to the grounding terminal, with a connection resistance not exceeding 0.1 Ω. The boiler shall possess sufficient electrical dielectric strength to withstand a 1-minute withstand voltage test at 2000 V cold-state and 1000 V hot-state, 50 Hz, without breakdown or flashover.
4.锅炉安装完毕后应按TSG 11-2020《锅炉安全技术规程》及GB/T16508.4-2022
《锅壳锅炉第4部分：制造、检验与验收》的有关规定进行水压试验，试验压力为1.4MPa,并在此压力下保持20分钟。
4. After installation, the boiler shall undergo a hydrostatic test in accordance with the provisions of TSG 11-2020 “Safety Technical Regulations for Boilers” and GB/T 16508.4-2022 “Shell Boilers—Part 4: Manufacturing, Inspection and Acceptance.” The test pressure shall be 1.4 MPa, maintained at this pressure for 20 minutes.
5.锅炉的油漆、包装应按NB/T47055-2017《锅炉涂装和包装通用技术条件》。
5. The paint and packaging of the boiler should comply with NB/T47055-2017 “General Technical Conditions for Coating and Packaging of Boilers”.
Superior LDR Electric Boiler For Different Industry
Customer Cases
Yongxing LDR electric steam boilers can be divided into electric boilers, electric tubes and electric heating steam boilers according to different media.
Among them, electric heating hot water boilers are mostly used in residential production, while electric heating steam boilers are mostly used in industrial production such as high temperature disinfection and sterilization.
Henan Rongde Purification Engineering Co., Ltd. decided to replace the original coal-fired steam boiler with an electric heating steam boiler.
After learning about Yongxing Boiler in detail, I purchased an LDR0.5-0.7 electric heating steam boiler from Yongxing Boiler.
