09-02-19 Topic - Arrangement of heat exchange tubes (prizes for participation)

The advantages and disadvantages of equilateral triangle, corner triangle, square and corner square are mainly related to cleaning, scaling and pipe spacing!

1. Arrangement of equilateral triangles and corner equilateral triangles. The triangle arrangement is compact and has good heat transfer effect. The tubes on the same plate are arranged about 10% more than the square ones, and the heat transfer area is larger in the same volume. It is suitable for situations where the shell-side medium has less dirt and does not require mechanical cleaning. 2. Square and corner square arrangements. Square and corner square arrangements. The small bridges between the tubes form a straight channel to facilitate mechanical cleaning. When it is necessary to frequently clean the dirt on the outer surface of the pipe, a square arrangement or a corner square arrangement is often used. 3． Combination arrangement method: in multi-pass heat exchangers.

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There are three basic forms of arrangement of heat transfer tubes on the tube sheet, namely equilateral triangle, equilateral quadrilateral and concentric circle arrangement. The heat transfer tubes should be arranged so that they are evenly and compactly distributed over the entire circular cross-section of the heat exchanger. At the same time, issues such as fluid properties, tube box structure, and processing and manufacturing should also be considered. At present, the equilateral triangle and square arrangement methods are commonly used in design. When the shell side fluid is a non-polluting medium, the equilateral triangle arrangement method is adopted. The equilateral triangle arrangement method can configure a larger number of tubes in a certain tube plate area, and because the distances between tubes are equal, it is convenient to draw lines and drill holes during tube plate processing. When the shell side fluid needs to be cleaned mechanically, the square arrangement method is used. The square arrangement method can arrange a small number of tubes in a certain tube plate area. This arrangement method is commonly used in floating head and packed function heat exchangers. If the square-arranged tube bundle is rotated 45˚ and installed, the shell-side convection heat transfer coefficient can be appropriately increased. In oxygen-generating equipment, the concentric circle arrangement method is used. This arrangement method is relatively compact, and the tubes are evenly distributed near the shell. In small-diameter heat exchangers, the number of tubes arranged on the tube plate according to this method is more than that arranged in an equilateral triangle. In addition to the above three arrangement methods, a combined arrangement method can also be used. For example, in a multi-pass heat exchanger, a triangular arrangement is used in each pass, and a square arrangement is used between each pass to facilitate the arrangement of partitions. Among the heat exchanger series in my country, the fixed tube plate type mostly adopts an equilateral triangle arrangement. ； The floating head type is mostly arranged in a square staggered arrangement, and also has an equilateral triangle arrangement. The concentric circle arrangement method is used for small shell diameter heat exchangers. The square arrangement method of pipe arrangement is the least compact and has the largest distance between pipes. The gap required for cleaning the outer surface of the pipes is large and easy to clean.

1. The equilateral triangle and the corner equilateral triangle are compact in structure, and the heat transfer effect is good because convection heat transfer is mainly performed on the shell side. It is suitable for situations where the medium on the shell side has less dirt and does not require mechanical cleaning outside the tube. 2. Square and corner square shapes facilitate mechanical cleaning. Suitable for occasions where dirt outside the pipe is frequently cleaned.

The standard form of arrangement is: ①The equilateral triangle and corner equilateral triangle arrangements are suitable for situations where the shell side medium has less dirt and does not require mechanical cleaning. ②Square and corner square arrangements are generally used in situations where the tube bundle can be pulled out for cleaning.

There are four pipe routing methods in 151, 30 degrees, 60 degrees, 45 degrees, and 90 degrees. The number of pipes is reduced from left to right in the order above. The heat transfer efficiency decreases, the pressure drop decreases, and the cleaning difficulty decreases. Fixed tube plate heat exchangers mostly use 30-degree or 60-degree pipe layouts. Floating-head heat exchangers mostly use 45-degree pipe layouts. Vacuum condensers, or 90-degree pipe layouts in concentric circles or regular hexagons are used in situations where pressure drop requirements are very strict. Due to the unequal spacing between tubes, the fluid with different pressures in the shell side is easy to leak from places with low resistance, so try to use less of them.

1. The heat exchange tubes are arranged in an equilateral triangle and a corner equilateral triangle arrangement. The triangular arrangement is compact and has good heat transfer effect. The tubes on the same plate are arranged about 10% more than the square ones, and the heat transfer area is larger in the same volume. It is suitable for occasions where the shell side medium has less dirt and does not require mechanical cleaning. 2. The tube plate structure is square and corner square arrangement, and the small bridge between the tubes forms a straight channel, which is convenient for mechanical cleaning. When the dirt on the outer surface of the tube needs to be cleaned frequently, a square arrangement or a corner square arrangement is often used.

Regarding the arrangement of heat exchange tubes in heat exchangers, there are three basic forms of arrangement of heat transfer tubes on the tube plate, namely equilateral triangle, equilateral quadrilateral and concentric circle arrangement. The heat transfer tubes should be arranged so that they are evenly and compactly distributed over the entire circular cross-section of the heat exchanger. At the same time, issues such as fluid properties, tube box structure, and processing and manufacturing should also be considered. At present, the equilateral triangle and square arrangement methods are commonly used in design. When the shell side fluid is a non-polluting medium, the equilateral triangle arrangement method is adopted. The equilateral triangle arrangement method can configure a larger number of tubes in a certain tube plate area, and because the distances between tubes are equal, it is convenient to draw lines and drill holes during tube plate processing. When the shell side fluid needs to be cleaned mechanically, the square arrangement method is used. The square arrangement method can arrange a small number of tubes in a certain tube plate area. This arrangement method is commonly used in floating head and packed function heat exchangers. If the square-arranged tube bundle is rotated 45˚ and installed, the shell-side convection heat transfer coefficient can be appropriately increased. In oxygen-generating equipment, the concentric circle arrangement method is used. This arrangement method is relatively compact, and the tubes are evenly distributed near the shell. In small-diameter heat exchangers, the number of tubes arranged on the tube plate according to this method is more than that arranged in an equilateral triangle. In addition to the above three arrangement methods, a combined arrangement method can also be used. For example, in a multi-pass heat exchanger, a triangular arrangement is used in each pass, and a square arrangement is used between each pass to facilitate the arrangement of partitions. :)

1. The equilateral triangle and the corner equilateral triangle are compact in structure, and the heat transfer effect is good because convection heat transfer is mainly performed on the shell side. It is suitable for situations where the medium on the shell side has less dirt and does not require mechanical cleaning outside the tube. 2. Square and corner square shapes facilitate mechanical cleaning. Suitable for occasions where dirt outside the pipe is frequently cleaned.

There are four main arrangements of tubes: Triangle, corner triangle, square, corner square. The arrangement of equilateral triangles is the most commonly used, because the distance between the tubes is equal, so the maximum number of tubes can be arranged on the same tube plate area, and it is convenient for marking and drilling of the tube plate. However, it is not easy to clean between tubes. TEMA standards stipulate that when the shell side needs to be mechanically cleaned, a triangular arrangement must not be used. When the shell side needs to be cleaned, it is generally arranged in a square shape. The inter-tube channels should be continuous along the entire tube bundle, and a 6mm cleaning channel must be ensured. The arrangement of triangles and corner triangles, when the baffle spacing is the same, has a much smaller flow cross-section than that of squares and corner squares, which is beneficial to increasing the flow rate.

1. Arrangement of equilateral triangles and corner equilateral triangles. The triangle arrangement is compact and has good heat transfer effect. The tubes on the same plate are arranged about 10% more than the square ones, and the heat transfer area is larger in the same volume. It is suitable for situations where the shell-side medium has less dirt and does not require mechanical cleaning. 2. Square and corner square arrangements. Square and corner square arrangements. The small bridges between the tubes form a straight channel to facilitate mechanical cleaning. When it is necessary to frequently clean the dirt on the outer surface of the pipe, a square arrangement or a corner square arrangement is often used. 3． Combination arrangement method: in multi-pass heat exchangers.

The heat exchange tubes can be arranged in an equilateral triangle or square on the tube sheet. equilateral triangle: The arrangement method can configure a larger number of tubes in a certain tube plate area, and since the distances between tubes are equal, it is convenient to draw lines and drill holes during tube plate processing. When the shell side fluid needs to be cleaned mechanically, the square arrangement method is used. square: The number of tubes that can be arranged in a certain tube plate area by the arrangement method is small. This arrangement method is commonly used in floating head and packed function heat exchangers. If the square-arranged tube bundle is rotated 45˚ and installed, the shell-side convection heat transfer coefficient can be appropriately increased.

1. The triangle arrangement is compact and the heat transfer effect is good. The tubes on the same plate are about 10% more rows than the square, and the heat transfer area is larger in the same volume. It is suitable for situations where the shell side medium has less dirt and does not require mechanical cleaning. 2. The square arrangement and the corner square arrangement are square and corner square arrangements. The small bridge between the tubes forms a straight channel, which is convenient for mechanical cleaning. When the dirt on the outer surface of the tubes needs to be cleaned frequently, a square arrangement or a corner square arrangement is often used. 3. Combination arrangement method: multi-pass heat exchanger

Arrangement of heat exchange tubes: 1. Arrangement of equilateral triangle and corner equilateral triangle. The triangle arrangement is compact and has good heat transfer effect. The tubes on the same plate are arranged about 10% more than the square ones, and the heat transfer area is larger in the same volume. It is suitable for situations where the shell-side medium has less dirt and does not require mechanical cleaning. 2. Square and corner square arrangements. Square and corner square arrangements. The small bridges between the tubes form a straight channel to facilitate mechanical cleaning. When it is necessary to frequently clean the dirt on the outer surface of the pipe, a square arrangement or a corner square arrangement is often used. 3. In the combined arrangement method multi-pass heat exchanger.

The standard form of arrangement is: ①The equilateral triangle and corner equilateral triangle arrangements are suitable for situations where the shell side medium has less dirt and does not require mechanical cleaning. ②Square and corner square arrangements are generally used in situations where the tube bundle can be pulled out for cleaning.

1. The heat exchange tubes are arranged in an equilateral triangle and a corner equilateral triangle arrangement. The triangular arrangement is compact and has good heat transfer effect. The tubes on the same plate are arranged about 10% more than the square ones, and the heat transfer area is larger in the same volume. It is suitable for occasions where the shell side medium has less dirt and does not require mechanical cleaning. 2. The tube plate structure is square and corner square arrangement, and the small bridge between the tubes forms a straight channel, which is convenient for mechanical cleaning. When the dirt on the outer surface of the tube needs to be cleaned frequently, a square arrangement or a corner square arrangement is often used.

The regular triangle arrangement method, the concentric circle arrangement method and the square arrangement method of the heat exchanger tube arrangement. The regular hexagonal arrangement method is simple and compact, and the process is simple. The advantages of the concentric circle arrangement method are relatively compact, and the tubes are evenly arranged near the shell. In small-diameter heat exchangers, the number of tubes laid in this way is more than that of equilateral triangles. The disadvantage is that the spacing between tubes in each layer is unequal, which makes marking, manufacturing and assembly on the tube plate more difficult. The advantages of the square arrangement method are that it is easy to clean and can be used in situations where dirt is generated and the tube bundle needs to be pulled out for cleaning. Disadvantages: When the tube plate area is constant, the number of tubes that can be patted is the least.

Equilateral triangle, corner equilateral triangle arrangement, square, corner square arrangement 1. The triangular arrangement is compact, and the heat exchanger of equal cross-section has a large number of tube bundles and a large heat exchange area. However, the distance between tube bundles is small and suitable for teaching cleaning media. 2. The cross-sections of square and corner square arrangements are not worthy of relatively few tubes, and the heat exchange effect is not as good as that of triangles, but mechanical cleaning can be achieved.

1. Equilateral triangle and corner equilateral triangle 2. There are several types of corners in square and corner square.