Introduction to the advantages and disadvantages of gear pumps with electric heating tubes and asphalt pumps with insulation layers

Gear pumps with electric heating tubes and asphalt pumps with insulation layers are commonly used equipment for transporting high viscosity and easily solidifying media such as asphalt, heavy oil, resin, etc. They each have their own design intentions and applicable fields

The scenery.

Below, I will provide a detailed introduction to their advantages and disadvantages, and compare and summarize them.

1、 Gear pump with electric heating tube

This type of pump is based on a standard gear pump, with electric heating rods embedded inside the pump body, pump cover, or side plate.

Advantages:

1. High heating efficiency and fast temperature rise: The electric heating tube is directly embedded inside the metal of the pump body, with a short heat conduction path and low loss, which can quickly and efficiently raise the temperature of the pump body, making it very suitable for cold start. In the short term

The solidified medium can be melted inside the room.

2. Precise temperature control: Usually equipped with a precise temperature control system, the temperature of the pump body can be controlled very accurately to maintain it at the set optimal working temperature

Within the range, avoid asphalt from coking due to high temperature or solidifying due to low temperature.

3. Relatively compact structure: No additional interlayer space is required, the external dimensions of the pump are not much different from ordinary gear pumps, and the installation space requirements are relatively low.

4. Strong independence: does not require external heat sources (such as steam or thermal oil boilers), only needs to be connected to a power source to work, suitable for mobile devices or situations where external heat sources are inconvenient to provide.

5. Strong coagulation ability: For the medium that has completely solidified inside the pump, there is a high probability that it can be melted and the gear pump can be restarted through electric heating, which is one of its major advantages.

Disadvantages:

1. There is a risk of local overheating: the area near the heating tube has the highest temperature. If there is poor thermal conductivity or temperature control failure, it is easy to cause the medium to coke, block the flow channel, and damage the pump or seal in that area.

2. High energy consumption: Electricity is a high-quality energy source, and the operating cost is usually higher than using steam or thermal oil insulation jackets.

3. Complex maintenance and replacement: If the built-in electric heating tube is damaged, repairing or replacing it usually requires completely disassembling the pump, which is very troublesome and may even require returning to the factory for repair, resulting in long downtime.

4. Power limitation: The power of a single heating tube is limited, and for ultra large pumps or extremely cold environments, the heating capacity may be insufficient.

5. Only heating the pump body itself: Its main function is to prevent the medium inside the pump body from solidifying, and its insulation effect on the connected pipeline system is limited. It still needs to be used in conjunction with pipeline heat tracing.

insulated by introducing external heat media (such as thermal oil, steam, hot water) into this cavity.

Advantages:

1. Uniform and gentle heating: The heat medium fills the entire jacket cavity and can evenly transfer heat from the outer wall of the entire pump body, effectively avoiding problems of local overheating and medium coking. It is suitable for heat sensitive media

(such as some modified asphalt) is more friendly.

2. Low operating costs: If the factory has existing steam boilers or heat transfer oil furnaces, the operating cost of using jacket heating is much lower than electricity consumption.

3. Safe and reliable: The heating process is mild, without high temperature points, and the failure rate is relatively low. The jacket structure is simple and not easily damaged.

4. Easy to maintain: The jacket is a part of the pump body and is generally not damaged. Even if maintenance is required, it usually does not involve the core components of the pump.

5. Can be integrated with pipeline systems: The insulation jacket of the pump can be easily connected to the jacket or heat tracing system of the conveying pipeline, forming a complete and uniform insulation system.

Disadvantages:

1. Dependence on external heat sources: It is necessary to have external heat sources such as steam or thermal oil to work, which does not have independence and limits its application scenarios (such as remote construction sites and vehicle mounted equipment).

2. Complex system: It requires supporting boilers, pipelines, valves, and control units, and the initial investment may be higher, making the system more complex.

3. Slow heating rate: Compared to direct heating, the heat transfer rate through jacket heating is slower, and a longer preheating time is required during cold start, making it difficult to quickly thaw.

4. Slightly lower temperature control accuracy: often controlling the flow rate and temperature of the heat medium, the response and control accuracy to the actual temperature of the pump body may not be as direct as electric heating.

5. Relatively large volume: The pump body with a jacket usually has larger dimensions and weight than electric heating pumps of the same specifications.

3、 Comparative summary and selection suggestions

Gear pump with electric heating tube vs. asphalt pump with insulation layer

Electric heating gear pump: high heating efficiency, fast temperature rise, suitable for low cold start, slow temperature rise, and long preheating time. The heating uniformity is average, but there is a risk of local overheating. High temperature control accuracy. run

High cost (electricity). The system has simple complexity (only requires power supply) and strong independence, without the need for external heat sources. Applicable scenarios include intermittent operation, mobile devices, no external heat source, and situations requiring de coagulation.

Asphalt pump with insulation layer: excellent heating efficiency, uniform and gentle, anti coking, average accuracy. Low operating costs (if there is an existing heat source). The system complexity is relatively complex (requiring boilers, pipelines, etc.)

Weak independence, completely dependent on external heat sources. Easy to maintain. Suitable for continuous production, central heating systems, and high temperature uniformity requirements

Selection suggestion:

When choosing an electric heating tube gear pump:

The operating conditions are intermittent and often require a cold start.

There are no convenient heat sources such as steam or thermal oil on the installation site.

The equipment is mobile (such as asphalt distribution trucks, tank trucks).

The size and space of the pump are limited.

When choosing an insulated interlayer asphalt pump:

The operating condition is 24-hour continuous operation.

The factory has ready-made and low-cost steam or thermal oil systems.

The medium being transported is highly sensitive to temperature and is prone to coking and deterioration.

It is necessary to form a complete and uniform insulation system with the pipeline system.

In practical applications, it is sometimes seen that gear pumps combining two methods have both insulation layers and electric heating tubes to achieve more flexible and reliable temperature control, but this also increases equipment manufacturing

Cost and complexity.