浸入式加热器：为工业液体高效加热的“电热棒”（上篇 · 中英文）-新闻动态-上海爱泽工业设备有限公司

浸入式加热器：为工业液体高效加热的“电热棒”（上篇 · 中英文）

发布时间：2026/7/1 8:30:43关注度：108

第一章 —— 什么是浸入式加热器？

Chapter One —— What is an Immersion Heater?

浸入式加热器是一种快速、经济且高效的液体加热方式，适用于储罐、容器或工业设备中的液体加热。浸入式加热器也称为卡口式加热器或电浸入式加热器，配有加热元件，可直接插入盛有水、油、化学品或其他工艺流体的容器中，从而加热容器内的所有介质。

浸入式加热器利用直接传热原理，能够迅速将液体加热至所需温度，并具备精确的温控能力和可靠的热性能。这些加热器由多根管束组成，可以安装在容器侧面或直接浸入容器内。加热器内部的加热线圈将热量传递给液体，热量随后在容器内均匀分布，从而实现稳定的加热效果、更高的能源效率和更短的加热时间。

浸入式加热器是一种经济高效且环保的物料加热方式，可提供清洁能源，且无残留排放物或污染物。在工业领域，它们广泛应用于工艺加热、防冻保护、储罐加热，以及维持油品、溶液和其他液体的粘度。在核反应堆中，它们用于维持蒸汽发生所需热水的恒温。

浸入式加热器主要分为直接式和间接式两类。直接式浸入式加热器的加热元件直接浸没在液体中，而间接式浸入式加热器则利用辐射或对流方式进行加热。侧装式（Over-the-side）和管道式（In-line）加热器属于直接式浸入式加热器，因为它们的护套式加热元件直接与液体接触；而管道式（Pipe）和红外浸入式加热器则归类为间接式，因为它们不与液体直接接触。在选择合适的工业浸入式加热器时，买家通常会综合考量功率密度、材质兼容性、工作温度及容器尺寸等因素，以确保设备在特定应用场景下安全、高效地运行。

An immersion heater is a fast, economical, and efficient method for heating liquids in tanks, vats, or industrial equipment. Also known as bayonet heaters or electric immersion heaters, they have heating elements that can be directly inserted into a container of water, oil, chemicals, or other process fluids in order to heat the entire contents.

Immersion heaters use direct heat transfer to quickly bring liquids to the desired temperature with precise temperature control and reliable thermal performance. Composed of bundles of tubing, these heaters can be mounted on the side of a container or submerged directly in its contents. The heating coils within the heater transfer heat to the liquid, which then distributes evenly throughout the container, supporting consistent heating, improved energy efficiency, and reduced heat-up time.

Immersion heaters offer a cost-effective and environmentally friendly way to heat materials, providing a clean energy source without residual discharge or pollutants. In industrial applications, they are widely used for process heating, freeze protection, tank heating, and maintaining viscosity in oils, solutions, and other liquids. In nuclear reactors, they are used to maintain a constant temperature of heated water for steam generation.

There are two types of immersion heaters: direct and indirect. Direct immersion heaters have their heating elements positioned directly in the liquid, while indirect immersion heaters use radiation or convection for heating. Over-the-side and in-line heaters are direct immersion heaters because their sheathed elements come into contact with the liquid. Pipe and infrared immersion heaters are classified as indirect, as they do not make direct contact with the liquid. When selecting the right industrial immersion heater, buyers often compare watt density, material compatibility, operating temperature, and tank size to ensure safe, efficient performance for their specific application.

第二章 —— 浸入式加热器的工作原理

Chapter Two —— How an Immersion Heater Works?

浸入式加热器内部包含一个电阻式加热元件，该元件被包裹在保护套内。启动后，加热元件会加热周围的保护套，保护套进而加热保护层，最终加热液体。加热器的效率取决于保护套和保护层的导热性。

直接浸入式加热器和间接浸入式加热器采用两种不同的液体加热方式。直接浸入式加热器直接插入液体中，顶部或侧面通过接头固定。其加热元件与待加热液体接触。安装到位后，接通电源，电流通过加热元件进入液体。

间接浸入式加热器置于封闭式管道内，然后将管道浸入液体中。加热元件加热管道内的空气，产生类似烤箱的效果，从而加热周围的液体。这种设计的主要优点是加热器不与液体直接接触，从而防止污染和腐蚀。

加热材料所需的时间取决于浸入式加热器的数量和功率。浸入式加热器经过专门设计，可处理特定类型的材料，以实现最佳加热效率。

Immersion heaters feature an electrically resistant heating element enclosed in a protective sheath. When activated, the heating element warms the surrounding jacket, which in turn heats the sheath and subsequently the liquid. The heater's effectiveness relies on the thermal conductivity of both the jacket and the sheath.

Direct and indirect immersion heaters use two different methods for heating liquids. A direct immersion heater is inserted directly into the liquid at the top or in a fitting on the side. Its heating element comes in contact with the fluid to be heated. Once positioned, it is turned on and electricity runs through the heating element into the liquid.

An indirect immersion heater is placed inside a closed-end pipe that is then immersed in the liquid. The heating element warms the air inside the pipe, creating an oven-like effect that heats the surrounding liquid. The main advantage of this design is that the heater does not come into direct contact with the fluid, thereby preventing contamination and corrosion.

The time required to heat a material depends on both the quantity and power level of the immersion heater. Immersion heaters are designed to handle specific types of materials for optimal heating efficiency.

浸入式加热器的构成要素

Parts of an Immersion Heater

在检查浸入式加热器时，有几个关键要素需要重点关注，包括：

• 护套材质

• 功率密度

• 功率（瓦数）

• 外壳

• 温度范围

• 加热元件

下面将逐一探讨这些要素。

When examining an immersion heater, there are certain elements that have to be closely observed. They include:

• Sheath material

• Power density

• Wattage

• Enclosure

• Temperature range

• Heating element

Each of these factors are discussed below.

护套材质 / Sheath Material：

关于护套，最关键的因素是与其直接接触的介质（材料或流体），因为不同的护套材质对各种液体的反应各不相同。下表简要介绍了各种护套材质。浸入式加热器制造商通常会提供相关图表，标明哪些护套材质适用于特定应用场景。

选择合适的护套材质至关重要，因为一旦护套失效，可能会引发严重问题。腐蚀是最常见的失效形式，且大多数浸入式加热器制造商均不提供针对腐蚀问题的保修服务。

The most crucial factor regarding the sheath is the material or fluid that will come into direct contact with it, as different sheath materials respond differently to various liquids. The chart below serves as a brief guide to sheath materials. Manufacturers of immersion heaters often provide charts indicating which sheathing materials are suitable for specific applications.

Choosing the right sheath material is crucial, as its failure can result in significant problems. Corrosion is the most common type of failure, and most immersion heater manufacturers do not offer warranties against it.

在各种护套材料中，Incoloy（一种耐腐蚀镍基合金）应用最为广泛。它在高温下具有卓越的强度，并提供多种合金牌号，以适应各种流体、液体及化学介质。

Among the various sheathing materials, Incoloy, a nickel-based corrosion-resistant alloy, is the most widely used. It offers superior strength at high temperatures and is available in multiple alloy forms to accommodate a range of fluids, liquids, and chemicals.

功率密度 / Power Density：

浸入式加热器的功率密度必须根据待加热液体的特性进行计算。功率密度设置不当可能导致液体过热以及加热器内部热量过度积聚。决定适宜功率密度的关键因素在于液体从加热元件带走热量的能力。

水能有效散发加热元件产生的热量，因此允许采用较高的功率密度。相比之下，原油和糖蜜等物质的传热效率较低，需要采用较低的功率密度，如下图所示。

The power density of an immersion heater must be calculated to match the specific liquid being heated. Incorrect power density can lead to overheating of the liquid and excessive heat buildup in the heater. A crucial factor is the liquid's ability to dissipate heat from the heater's element, which determines the appropriate power density.

Water effectively dissipates heat from a heating element, allowing for a higher power density. In contrast, substances like crude oil and molasses do not transfer heat as efficiently and require a lower power density, as illustrated in the power density chart below.

功率 / Wattage：

下一个需要考虑的因素是加热器能否提供足够的热量以达到预定温度，这取决于其功率大小。功率的计算基于以下三个关键因素：

启动

此阶段所需的功率最高，具体取决于加热方式（如传导、对流或辐射）以及加热器的类型。

运行

当浸入式加热器完成启动后，所需的功率应保持恒定，以维持持续的热量输出。

热量损失

任何加热设备在运行过程中都必须考虑热量损失。对于浸入式加热器而言，盛装液体的容器、加热器类型以及液体种类决定了热量损失的大小，而热量损失会增加所需的功率。

这三个因素受以下条件影响：待加热物体的材质与质量、所需的温差，以及达到目标温度所需的时间。

The next consideration is whether the heater can deliver sufficient heat to reach the desired temperature, which is determined by its wattage. Wattage is calculated based on three key factors:

Startup

This requires the greatest amount of wattage and is dependent on the method of heating such as conduction, convection, or radiation as well as the type of heater.

Operation

When the immersion heater has achieved start up, the amount of wattage required should remain constant and maintain continual heat flow.

Heat loss

Heat loss has to be factored into the operation of any heating device. In the case of an immersion heater, the enclosure for the liquid, the type of heater, and type of liquid determine the amount of heat loss, which can increase the required amount of wattage.

These three factors are influenced by the material and mass to be heated, the temperature difference required, and the time needed to achieve the desired temperature.

外壳 / Enclosures：

自20世纪中叶以来，浸入式加热器的外壳（或称壳体）通常采用铝材制造。尽管塑料外壳因其良好的成型性能而日益普及，但其质量往往不及铝制外壳。鉴于铝材具备优异的机械强度和耐热性能，大多数制造商仍倾向于使用铝材。

对于应用于核电站等场景的大型浸入式加热器，则需要使用更重、密度更高的金属材质。

Immersion heater enclosures, casings, have normally been made from aluminum since the middle of the 20th Century. Plastic enclosures have become more popular because of plastic‘s moldability but have been of inferior quality. Most manufacturers have continued to use aluminum for its mechanical and thermal resistance.

For larger immersion heaters for uses such as atomic power plants, heavier denser metals are required.

上图中深蓝色的部分是外壳，其中容纳了图中所示管式插入型间接浸入式加热器的接线。

The dark blue section in the above image is the enclosure that contains the wiring for the pictured pipe insert, indirect immersion heater.

温度范围 / Temperature Range：

浸入式加热器的温度范围取决于其具体用途。大多数工业加热器设计用于将水加热至约 900°F（482°C）。根据应用需求，热量输出将保持恒定。决定热量输出的两个关键因素是供电电压和电阻。

The temperature range for immersion heaters is dependent on how it will be used. Most industrial heaters are designed to heat water to around 900° F or 482\\° C. Depending on application requirements, the amount of heat will remain constant. Two key factors in the amount of heat produced are the voltage supply and resistance.

加热元件 / Heating Element：

浸入式加热器的加热元件由镍铬合金（即“镍铬丝”）与钨、钼或钽等难熔金属组合而成，并封装在不锈钢或钛金属外壳内。大多数加热元件采用氧化镁进行绝缘，氧化镁充当了加热元件与外壳之间的填充材料。

加热元件的成分会根据被加热介质的不同而有所差异。例如，用于加热油或气体的加热元件通常采用低合金钢制造。下图展示了一款配备不锈钢加热元件的浸入式加热器，该加热器专为酿造工艺设计。

The heating element of an immersion heater is composed of a nickel-chrome alloy called nichrome, combined with refractory metals such as tungsten, molybdenum, or tantalum, and encased in stainless steel or titanium. Most heating elements are insulated with magnesium, which acts as a filler between the heating element and the sheath.

The composition of heating elements can vary based on the material being heated. For example, low alloy steels are commonly used in heating elements designed for heating oil or gas. The image below shows an immersion heater equipped with a stainless steel heating element, specifically designed for the brewing process.

第三章 —— 应用领域

Chapter Three —— What Are the Applications

浸入式加热器用于加热流体进行测试或将材料维持在所需温度。它们可在各种条件下运行，无需明火。由于环保和成本效益方面的考虑，工业用电浸入式加热器已成为制造商最常用的加热设备。

在寒冷天气下，需要采取防冻措施以防止物料结冰。石油天然气、水处理、交通运输、农业及采矿等行业均依赖浸入式加热器来实现这一目标。对于油基产品而言，主要问题往往不在于结冰，而在于产品可能凝胶化或变成浓稠的蜡状物。

Immersion heaters are employed to heat fluids for testing or to maintain materials at a desired temperature. They operate under various conditions without the need for an open flame. Electrical industrial immersion heaters have become the most prevalent heating devices used by manufacturers, largely due to environmental considerations and cost efficiency.

Freeze protection is required to keep materials from freezing in cold weather. Industries such as oil and gas, water treatment, transportation, agriculture, and mining depend on immersion heaters for that purpose. For oil based products, the problem isn‘t so much freezing but having products turning to gel or a thick wax.

浸入式加热器的应用

Applications for Immersion Heaters

核电 / Nuclear Power：

核电站利用浸入式加热器来维持反应堆内的水压，以产生蒸汽。下图由 Wattco Manufacturing 提供，展示了浸入式加热器在核电站关键部位的安装位置。

Nuclear power plants utilize immersion heaters to maintain water pressure in reactors for steam production. The diagram below, provided by Wattco Manufacturing, illustrates the placement of immersion heaters in key locations within a nuclear power plant.

废水处理 / Wastewater Management：

低温和冰冻天气可能导致废水处理设施中的管道堵塞或结冰。浸入式加热器有助于维持管道和储罐内的水流，确保各项作业顺利进行。

Low and freezing temperatures can lead to pipes at wastewater facilities becoming clogged or frozen. Immersion heaters help maintain water flow in the pipes and reservoirs, ensuring that operations continue smoothly.

油气行业 / Gas/Oil Industry：

在严寒条件下，浸入式加热器可防止油气介质凝固成凝胶状或蜡状物质。通常采用侧挂式浸入式加热器（如下图所示），这种加热器无需改动现有基础设施即可安装，非常适合无法在容器壁上开孔插入加热元件的应用场景。

Immersion heaters prevent gas and oil from solidifying into gel or wax in harsh, cold conditions. Typically, an over-the-side immersion heater is used, which can be installed without altering the existing infrastructure, as shown in the image below. These heaters are ideal for situations where insertion into the container wall is not feasible.

水泥养护 / Cement Curing：

在建筑行业中，浸入式加热器被用于加速水泥的养护过程。正如在油气加热应用中一样，侧装式加热器也被用于实现更快速、更均匀的加热效果。

In the construction industry, immersion heaters are employed to accelerate the curing process. Similar to their use in heating oil and gas, over-the-side heaters are utilized to achieve faster and more consistent results.

实验室 / Laboratories：

实验室环境在药丸干燥和灭菌等工艺中需要精确的温度控制。螺塞式加热器和侧装式加热器是其中最常用的加热设备。下图展示了一款螺塞式浸入式加热器。

Laboratory environments demand precise temperature control for processes such as pill drying and sterilization. Screw plug heaters are among the most commonly used, along with over-the-side versions. The image below shows a screw plug immersion heater.

食品加工 / Food Processing：

在食品加工领域，使用浸入式加热器主要旨在满足质量标准及政府法规的要求。妥善控制水分对于防止细菌和病原体滋生至关重要。法兰式、侧挂式及螺塞式浸入式加热器常用于为大桶和容器的杀菌过程提供热量。浸入式加热器也常用于加热植物油，如下图所示。

In food processing, immersion heaters are primarily used to meet quality standards and government regulations. Proper moisture control is crucial to prevent the growth of bacteria and pathogens. Flange, over-the-side, and screw plug immersion heaters are used to provide heat for the sterilization of vats and containers. Immersion heaters are also commonly employed to heat vegetable oil, as illustrated in the image below.

化工业 / Chemical Industry：

在化工行业中，浸入式加热器对于将化学品维持在受控温度及防止其结冰至关重要。侧装式、法兰式、螺纹式、风道式及循环式加热器均有助于确保化学品处于安全且稳定的温度。

In the chemical industry, immersion heaters are essential for maintaining chemicals at a controlled temperature and preventing freezing. Over-the-side, flange, screw-in, duct, and circulation heaters all contribute to keeping chemicals at a safe and stable temperature.

酿造工业 / Brewing Industry：

浸入式加热器利用电能产生热量，对于酿造工业的安全至关重要。酿造过程涉及乙醇的生产，而乙醇具有一定的危险性。浸入式加热器不仅能提供精确的温度控制，还配备了自动切断功能以防止过热；其可靠性与耐用性也能在长期使用中显著降低成本。

Immersion heaters are crucial for safety in the brewing industry, as they generate heat using electricity. Brewing involves the production of ethanol, which can be hazardous. Immersion heaters provide precise temperature control and are equipped with automatic shut-off features to prevent overheating. Their reliability and durability also offer significant cost savings over time.

电镀 / Electroplating：

在金属表面施加涂层旨在提高其耐腐蚀性。浸入式加热器通过提供稳定且即时的热量来支持这一工艺，而这种热量对于维持电镀过程至关重要。下图展示了电镀工艺中使用的旋入式浸入式加热器。

Coatings are applied to metals to enhance their corrosion resistance. Immersion heaters support this process by delivering consistent and immediate heat, which is essential for maintaining the plating process. The image below shows a screw-in immersion heater used in the plating process.

水质净化 / Water Purification：

碳罐用于净化水质，通过去除氯、细菌、污染物以及其他可能影响水的气味和口感的有机或化学物质来实现这一目的。为确保罐内不含杂质，系统利用浸入式加热器对水进行加热，从而实现有效的杀菌消毒，如下图所示。

Carbon tanks are utilized to purify water by eliminating contaminants such as chlorine, bacteria, pollutants, and other organic or chemical substances that can affect the water's smell and taste. To ensure the tanks remain free of foreign substances, an immersion heater heats the water for effective sanitization, as shown in the image below.

常见问题

Frequently Asked Questions

什么是浸入式加热器？它是如何工作的？

What is an immersion heater and how does it work?

浸入式加热器是一种通过与加热元件直接或间接接触来加热液体的设备。电流通过保护套管内的电阻元件产生热量，并将热量传递给储罐或容器中的水、油或化学品。

An immersion heater is a device that heats liquids by direct or indirect contact with a heating element. Electricity powers the resistant element inside a protective sheath, transferring heat to water, oil, or chemicals in tanks or vats.

哪些行业使用浸入式加热器？

What industries use immersion heaters?

浸入式加热器广泛应用于核能、废水处理、油气、水泥养护、实验室、食品加工、化工、酿造、电镀及水净化等行业，用于加热、防冻和杀菌。

Immersion heaters are used in nuclear power, wastewater management, gas and oil, cement curing, laboratories, food processing, chemical processing, brewing, electroplating, and water purification for heating, freeze protection, and sterilization.

如何为浸入式加热器选择合适的套管材质？

How do I select the right sheath material for an immersion heater?

应根据流体的兼容性和温度要求来选择套管材质。例如，铜适用于清洁水，钢适用于油类，304不锈钢适用于腐蚀性液体，而Incoloy（镍铁铬合金）则是高温和腐蚀性环境的理想选择。

Select sheath material based on fluid compatibility and temperature needs. For example, copper suits clean water, steel handles oils, 304 stainless steel is for corrosive liquids, and Incoloy is ideal for high temperatures and corrosive environments.

浸入式加热器有哪些类型

What types of immersion heaters are available?

浸入式加热器分为直接式（加热元件与液体接触）和间接式（加热元件与流体隔离）两种。常见类型包括侧装式、直列式（直接加热）、管道式和红外式（间接加热）加热器。

There are direct immersion heaters, where elements contact the liquid, and indirect types, where the element is isolated from the fluid. Examples include over-the-side, in-line (direct), pipe, and infrared (indirect) heaters.

为什么在寒冷气候下，浸入式加热器是防冻的首选？

Why are immersion heaters preferred for freeze protection in cold climates?

浸入式加热器可防止管道、储罐和蓄水池中的液体结冰，确保废水处理、油气、水处理和采矿等行业在寒冷天气下保持液体流动。

Immersion heaters prevent freezing in pipes, tanks, and reservoirs, maintaining liquid flow for industries like wastewater management, oil and gas, water treatment, and mining during cold weather.

在选型或确定浸入式加热器规格时，有哪些重要因素？

What are the important factors when sizing or selecting an immersion heater?

需考虑套管材质、功率密度、功率（瓦数）、外壳、温度范围以及加热元件的构成。这些参数取决于液体的类型、数量、加热方式及具体应用需求。

Consider sheath material, power density, wattage, enclosure, temperature range, and heating element composition. These parameters depend on the liquid's type, quantity, heating method, and application requirements.

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