What is the function of a jacketed heat exchanger?

The jacketed heat exchanger is a kind of intermural heat exchanger, which is made by installing a jacket on the outer wall of the vessel, and has a simple structure; However, its heating surface is limited by the wall surface of the container, and the heat transfer coefficient.

It's not high, either. In order to improve the heat transfer coefficient and make the liquid in the kettle evenly heated, a stirrer can be installed in the kettle. When cooling water is introduced into the jacket.

or when there is no phase change of heater, a spiral separator or other measures to increase turbulence can also be set in the jacket to increase the heat coefficient on one side of the jacket. In order to supplement the lack of heat transfer surface, snake pipes can also be installed inside the kettle. Jacketed heat exchangers are widely used for heating and cooling reaction processes.

Heat transfer equipment, referred to as heat exchanger, is one of the most widely used equipment in many industrial sectors such as chemical, petroleum, power, and light industry. According to the application, it can be divided into heater, cooler, and condenser.

and evaporators, etc. Due to the different scale of production, the nature of the material, the requirements for heat transfer, etc., the types of heat exchangers are also diverse. This chapter mainly discusses:

The performance and characteristics of the main types of heat exchangers, so that the appropriate type can be selected according to the process requirements; Calculation of heat transfer area, determination of basic dimensions, and calculation of fluid resistance in order to select the appropriate specifications among the heat exchangers of the series standards.

Heat exchangers can be divided into the following three categories according to their heat transfer characteristics.

1. In the direct contact direct contact heat exchanger, the heat exchange between cold and hot fluids is realized through direct mixing. It is more convenient and effective when the process allows the two fluids to be mixed with each other, and its structure is relatively simple. Direct contact heat exchangers are often used for gas cooling or water vapor.

of condensation. 2. Regenerative regenerative heat exchanger is referred to as accumulator, which is mainly composed of heat capacity.

It consists of a large regenerator chamber that can be filled with refractory bricks.

or metal strips, etc. as fillers. When the cold and hot fluids alternately pass through the same regenerator, the heat obtained from the heating fluid can be transferred to the cold fluid through the packing to achieve the purpose of heat exchange. To accommodate continuous operation, at least two accumulators are required to be used alternately.

This type of heat exchanger has a simple structure and can withstand high temperatures, and is often used for the utilization of waste heat or cold capacity of gases. The disadvantage is that the equipment is large in size, and it is inevitable that there will be a certain degree of mixing when the two fluids alternate.

3. The characteristic of the partition wall heat exchanger is that the cold and hot fluids are separated by a metal wall (or a non-metallic wall with good thermal conductivity such as graphite, which is corrosion-resistant and has good thermal conductivity), so that the two fluids can transfer heat without being mixed.

Equipment introduction: This is a teaching experimental equipment mainly used to study the heat exchange principle of jacketed heat exchanger, including calculating the heat transfer efficiency and heat transfer coefficient of the system. The general structure of the equipment is a jacketed, double-walled glass container with an inner container volume of 2 liters, and a variable speed agitator built into the inner container.

There are 6 thermocouples distributed in the vessel, which measure the temperature of cold and hot water at various positions such as inlet and outlet respectivelyExperimental function: two liquid flows are separated by a solid wall, and heat is transferred from one liquid flow to another liquid flow to form indirect heating or cooling, and this device can demonstrate this process. When there is stirring in the vessel, hot water circulates into the outer cover, heats the quantitative liquid in the vessel, and the heating characteristics under this condition are studied.

The total heat transfer coefficient and the logarithmic average temperature difference with the temperature of the liquid in the container are studied, and the liquid flows continuously into the stirring vessel by coil heating, and when the energy balance is reached, the total efficiency and total heat transfer coefficient are calculated, and the total efficiency and total heat transfer coefficient are calculated to study the influence of stirring in the vessel on the heat transfer characteristics when the energy balance is reached.

The purpose of enhanced heat transfer is to obtain maximum heat transfer capacity with the smallest heat transfer equipment. According to the basic equation of heat transfer, there are several ways to strengthen the heat transfer process: 1. Increasing the heat transfer area A can increase the heat transfer.

However, as the equipment grows, so does the investment and maintenance costs. Whether this approach is adopted depends on whether the increase in heat transfer can compensate for the increase in costs. 2. To increase the average temperature difference of heat transfer, theoretically, the method of increasing the temperature of the heating medium or reducing the temperature of the cooling medium can be adopted.

However, this is often limited by objective conditions (such as steam pressure, air temperature, water temperature, etc.) and process conditions (such as the heat sensitivity of the product, freezing point, etc.). The higher the steam pressure, the higher the cost of the equipment. But at a certain source pressure.

Ways to reduce the resistance of the swallow steam pipeline can be taken to increase the pressure of heating steam. 3. Reduce the heat transfer heat resistance and improve the heat transfer coefficient. This is an effective way to intensify the heat transfer process.

If one of these thermal resistances is large and the others are relatively small, the maximum thermal resistance should be reduced. When the heat exchanger is first used, because there is no scale layer, the convective heat transfer heat resistance of the fluid is the main aspect, and the reduction of this thermal resistance is mainly achieved by increasing the flow rate and increasing the turbulence of the fluid. For example, the heat exchanger is changed from single-pass to multi-pass, and the spiral plate heat exchanger can be added to the baffle plate to increase the flow rate of the fluid.

Properly loading some additives into the tube can also play a role in enhancing turbulence and destroying the inner layer of stagnant flow. With the extension of the use time of the heat exchanger, the thermal resistance of the scale layer gradually increases, so preventing scale formation and removing the dirt in time is also the key to strengthening heat transfer.

A jacketed heat exchanger is a commonly used heat exchange device, and its main advantages include:

1.Safe and reliable: The jacketed heat exchanger separates the heat transfer medium from the heat transfer medium, and there is no direct contact between the two, which avoids the mixing of the medium and improves the safety and reliability.

2.High efficiency: The jacketed heat exchanger has high heat transfer efficiency, which can quickly transfer heat to the heat transfer medium, thereby improving production efficiency and reducing energy consumption.

3.Beautiful appearance: The jacketed heat exchanger has a simple and beautiful appearance, occupies a small space, is easy to maintain, and can effectively save production space and maintenance costs.

4.Wide range of application: Jacketed heat exchangers are suitable for a variety of industrial fields and blind application scenarios, such as chemical, electric power, pharmaceutical, food and other industries, and can meet the heat transfer needs of different media and temperatures.

In short, the jacketed heat exchanger has the advantages of safety and reliability, high efficiency, beautiful and practical, and wide application range, and is an ideal heat transfer equipment.

The eucalyptus points of jacketed heat exchangers are mainly as follows:

1.Simple design and easy maintenance: The jacketed heat exchanger consists of two housings and is easy to disassemble and clean. In addition, because there are no tube bundles and supports, the cleaning path is smoother and less prone to fouling and fouling.

2.High heat transfer efficiency: The jacketed heat exchanger adopts the structure of a chip heat exchanger, which makes it have high heat transfer efficiency and fast heat exchange speed, which can meet a wide range of process requirements.

3.Capable of withstanding high pressures and temperatures: Jacketed heat exchangers use high-strength materials that can withstand high temperatures and pressures above room temperature.

4.Wide range of applications: The jacket family shielded heat exchanger is suitable for heat transfer, boiling, evaporation and other operations of various liquids and gases, and is suitable for a variety of industrial purposes, especially in the chemical industry, pharmaceutical industry, etc.

In short, jacketed heat exchangers have the advantages of simple design, high heat transfer efficiency and easy maintenance, and are widely used in a variety of industrial fields.

The jacketed heat exchanger is to install the jacket on the outside of the vessel, and the confined space between the wall and the finger of the jacket is the passage of the heat carrier. The jacketed heat exchanger is mainly used in reactors and storage tanks, and its advantages are that the structure is simple, low, and does not occupy the space in the container, but the heat transfer area of the jacketed heat exchanger is limited by the wall area of the device, and the heat transfer coefficient is not high. If necessary, snake pipes can be added to the container to expand the heat transfer area, and an agitator can also be installed in the container to force convection of the liquid in the container to improve the heat transfer effect.

The advantages of the jacketed heat exchanger are that the advantages of the jacketed heat exchanger are mainly that the heat exchange speed is fast, the heat exchange efficiency is good, the heat energy can be fully utilized, the heat energy loss is very small, the floor area is small, and the space is saved.

The advantages are simple structure, low cost, does not occupy the effective volume of the laughing tung in the device, the jacketed heat exchanger is a kind of inter-wall heat exchanger, and the concept is made of a jacket installed on the outer wall of the vessel, and the structure is simple; However, its heating surface is limited by the wall surface of the container, and the heat transfer coefficient is not too high.

What are the advantages of jacketed lead heaters?

Under normal circumstances, the advantage of the jacketed heat exchanger is that the structure of the cylinder is low, and it does not occupy the effective volume in the instrument.

Short answer: When calculating the size of a jacketed heat exchanger, it should be determined according to the specific process conditions and fluid parameters.

Details: Jacketed heat exchanger is a common heat exchange equipment, which is widely used in chemical, pharmaceutical, food and other industries. The calculation of its size involves a number of factors, including parameters such as fluid flow, temperature, and pressure, as well as the material and thickness of the jacket.

The following will be introduced in detail from these aspects of file search.

1. Fluid parameters.

The sizing of a jacketed heat exchanger first needs to determine the flow, temperature, pressure and other parameters of the fluid. These parameters determine the heat load of the heat exchanger and thus affect the size of the jacket. In general, the higher the flow rate, the greater the temperature difference, and the higher the pressure, the larger the size of the jacket.

Second, the material and thickness of the jacket.

The material and thickness of the jacket are also important factors that affect the size of the jacketed heat exchanger. The material of the jacket should be selected according to the nature of the fluid and the working conditions, generally stainless steel, carbon steel, copper and other materials are available. The thickness of the jacket should be determined according to the pressure and temperature of the fluid search, generally speaking, the higher the pressure and the higher the temperature, the greater the thickness of the jacket.

3. Heat exchange area.

The heat transfer area of the jacketed heat exchanger is also an important factor affecting the size. The larger the heat exchange area, the larger the size of the jacket. The size of the heat exchange area should be determined according to the heat load and heat transfer coefficient of the fluid.

4. Recommendations. When calculating the size of a jacketed heat exchanger, it should be determined according to the specific process conditions and fluid parameters. It is recommended to calculate the physical properties of the fluid and estimate the heat transfer coefficient before the size calculation, so as to more accurately determine the heat exchange area and the size of the jacket.

At the same time, attention should be paid to the selection of the material and thickness of the jacket to ensure the pressure resistance and corrosion resistance of the jacket. Finally, it is recommended that when designing and manufacturing jacketed heat exchangers, they should be strictly followed by relevant standards and specifications to ensure their safety and reliability.

The size of the jacketed heat exchanger needs to be calculated according to the specific use scenario and design process, which generally includes the following steps:

1.Determine the heat transfer parameters: First of all, it is necessary to determine the heat transfer parameters of the jacketed heat exchanger, including the heat to be transferred, the heat transfer coefficient, the inner diameter of the shell and the tube bundle, etc., which can be estimated or calculated according to the production process, working medium, fluid properties and other factors.

2.Calculation of the number of bundles and the length of the bundles: After the heat transfer parameters have been determined, the number of bundles and the length of the bundles of the jacketed heat exchanger need to be considered.

According to the heat transfer and total heat transfer coefficient, the heat exchange area of the steam side can be calculated, and then the flow area and pipe diameter of the water side can be calculated according to the area of the flow area of the steam side and the water side, so as to calculate the number of pipe bundles required, the length of each pipe bundle and the perforation position.

3.Determine the shell size: After calculating the number and length of the tube bundles, the shell size of the jacketed heat exchanger needs to be determined.

The size of the shell is mainly determined by the diameter, number and length of the tube bundles. The finger length of the shell is generally determined by the length of the tube bundle and the size of the two ends.

4.Adjust design parameters: The final design needs to consider factors such as the material of the jacketed heat exchanger, the pressure level of the shell, the distance between the tubes, the density and the arrangement.

It should be noted that the size calculation of jacketed heat exchangers needs to consider many factors, such as heat transfer fluid, flow rate, use environment, etc., and the design of specific dimensions needs to follow different standards and specifications to ensure the safe, stable and effective operation of the product.

The sizing of a jacketed heat exchanger involves many factors, such as operating temperature, pressure, flow rate, pipe diameter and wall thickness. Generally speaking, the size of the jacketed heat exchanger needs to be comprehensively considered according to the process requirements, fluid characteristics and the actual situation of the equipment, and a certain empirical formula is used to calculate. It is recommended to refer to the relevant design manuals and specifications for specific calculation formulas and methods, and conduct comprehensive analysis and calculation according to the actual situation to ensure the safety, reliability and process requirements of the equipment.

The calculation of the size of the jacketed heat exchanger is mainly based on the consideration of heat exchange, heat transfer area, fluid properties, pressure loss and other parameters that affect you, to determine the size and model of the heat exchanger.

The jacketed heat exchanger is a device that transfers part of the heat of the hot fluid to the cold flow search and transportation body, also known as a heat exchanger. Heat exchangers are common equipment in chemical, petroleum, power, food and many other industrial sectors, and occupy an important position in production. In chemical production, heat exchangers can be used as heaters, coolers, condensers, evaporators and reboilers, etc., which are more widely used.

Due to its different uses, there are many types of heat exchange equipment and different performance, but they can be summarized into two categories: shell-and-tube structure and plate structure. A heat exchanger is a device that transfers part of the heat of a hot fluid to a cold fluid, that is, it is filled with water or other medium in a large closed container, and there are pipes running through the container. Let the hot water run through the pipes.

Due to the temperature difference between the hot water in the pipeline and the hot and cold water in the container, heat exchange will be formed, that is, the heat balance of junior high school physics, and the heat of the high-temperature object is always transferred to the low-temperature object, so that the heat of the water in the pipeline is exchanged to the cold water in the container, and the heat exchanger is also called the heat exchanger.