CN215893330U - double-U-shaped tubular heat exchanger - Google Patents
double-U-shaped tubular heat exchanger Download PDFInfo
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- CN215893330U CN215893330U CN202120903782.5U CN202120903782U CN215893330U CN 215893330 U CN215893330 U CN 215893330U CN 202120903782 U CN202120903782 U CN 202120903782U CN 215893330 U CN215893330 U CN 215893330U
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Abstract
The utility model discloses a double-U-shaped tubular heat exchanger used for a coal chemical conversion unit. The heat exchanger combines two parallel horizontal U-shaped tubular heat exchangers back to back into one device, the pipe boxes are positioned at the left side and the right side of the device, the middle part is a heat exchanger shell, and the two pipe boxes, the pipe plates and the U-shaped pipe bundles are oppositely arranged in a back-to-back 180 degrees. The heat exchanger can effectively reduce the pressure drop of fluid and improve the length-diameter ratio of the heat exchanger, so that the occupied area is reduced, the appearance of equipment is attractive, and the energy consumption of the device is reduced.
Description
Technical Field
The utility model relates to a tubular heat exchanger.
Background
In the field of coal chemical industry, the conversion unit is responsible for increasing H in coal gas2The role of the content. The raw gas from the gasification unit exchanges heat with high-temperature conversion gas from the shift converter in the raw gas preheater before entering the shift converter, the raw gas enters the shift converter after having enough superheat degree to carry out shift reaction, and the high-temperature conversion gas from the shift converter self-produces medium-pressure saturated steam in the steam superheater superheat shift converter.
When the amount of the processed crude gas is not large, the traditional BEU-type heat exchanger is mostly adopted, and the pressure drop of the tube shell side is respectively controlled within 50 kPa. Taking a certain 60 ten thousand ton/year methanol project as an example, the gasification adopts a 6.5MPaG coal water slurry gasification technology, the temperature of the raw gas is 230 ℃, the tube side medium of a raw gas preheater is the raw gas, the shell side medium is the shift gas, the inlet temperature of the tube side is 230 ℃, and the outlet temperature is 305 ℃ (the final temperature of the catalyst); the inlet temperature of the shell pass is 421 ℃, the outlet temperature is 361 ℃, the temperature difference of the shell pass and the wall is 60 ℃, and the average heat exchange temperature difference is 112 ℃. The BEU type heat exchanger is adopted, the diameter of the heat exchanger is 1400mm, the length of a heat exchange tube is 4000mm, the tube pass pressure drop of the heat exchanger is 47kPa, the shell pass pressure drop is 50kPa, the BEU type heat exchanger is adopted, the shell diameter is enlarged in a proper amount in general design for ensuring the pressure drop of tube pass crude gas, and when the required heat exchange area is correspondingly reached, the length of the heat exchange tube is shortened in a proper amount, so that the BEU type heat exchanger is smaller in long diameter and is not attractive in appearance.
Along with the increasing of the scale of the coal chemical industry, the gas treatment capacity of the conversion device is increased more and more. Because the pressure drop of the fluid passing through the heat exchanger is in direct proportion to the quadratic power of the flow velocity of the fluid and the length of the heat exchange tube, when the flow velocity of the fluid is increased to 2 times, the pressure drop of the heat exchanger is changed to 4 times of the original pressure drop. The pressure drop of the heat exchanger easily exceeds the control value when the amount of the process gas of the heat exchanger increases. The heat exchanger is easily made short and thick by increasing the flow cross-sectional area of the fluid by increasing the diameter of the heat exchanger/number of heat exchange tubes, thereby reducing the flow rate and pressure drop, or by decreasing the length of the heat exchange tubes, thereby reducing the pressure drop. Moreover, the length of the heat exchanger tube can not be infinitely reduced, the treatment air volume of a single heat exchanger needs to be reduced at the moment, namely, the number of the heat exchangers is increased, and a plurality of heat exchangers connected in parallel are adopted, so that the problem of pressure drop can be solved, and the manufacturing cost and the occupied area of equipment are increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a double-U-shaped tubular heat exchanger. The heat exchanger can effectively reduce the pressure drop of fluid, improve the length-diameter ratio of the heat exchanger, reduce the occupied area, beautify the appearance of equipment and reduce the energy consumption of the device.
In order to achieve the purpose, the technical scheme of the utility model is as follows: a double-U-shaped tubular heat exchanger is characterized in that the heat exchanger is a horizontal double-U-shaped tubular heat exchanger, the heat exchanger comprises two sets of same U-shaped tube bundles and corresponding tube boxes and tube plates, the two sets of tube plates are connected through a same shell, the two sets of tube boxes are respectively positioned on the left side and the right side of equipment, the middle of the two sets of tube boxes is a heat exchanger shell, the two sets of tube boxes, the tube plates and the U-shaped tube bundles of the heat exchanger are symmetrically arranged back to back in 180 degrees, are mirror images of each other and are arranged in one heat exchanger shell.
Further, the heat exchanger is a gas-gas heat exchanger, both the tube-side fluid and the shell-side fluid are in gas phase, the tube-side fluid and the shell-side fluid are divided into two parts before entering the heat exchanger, and the two parts of fluid are half of the total gas quantity.
Furthermore, tube pass fluid enters from tube box inlets at two ends of the equipment and flows out from tube box outlets at two ends after heat exchange; the shell-side fluid enters from two pipe orifices at two ends of the shell, is converged into one in the middle after heat exchange, and flows out from the same outlet in the middle of the shell, so that the heat exchange working conditions of the tube-side fluid and the shell-side fluid in two sets of U-shaped pipe bundles are completely the same.
Further, the two sets of tube boxes, tube plates and U-shaped tube bundles have the same structure.
According to the double-U-shaped pipe type heat exchanger disclosed by the utility model, two sets of U-shaped pipes are arranged in the same shell back to back, the length-diameter ratio of the heat exchanger is within a reasonable range, and the appearance of the heat exchanger is attractive; meanwhile, the cold and hot fluid is divided into two parts before entering the heat exchanger, the shell pass medium and the tube pass medium flow through the heat exchanger are half of the total air volume, and the pressure drop of the shell pass medium and the tube pass medium after passing through the U-shaped tube bundle heat exchanger designed by the utility model can be obviously reduced. The heat exchanger is particularly suitable for working conditions with large volume flow of heat exchange fluid, such as a feed gas preheater, a steam superheater and the like of a large-scale coal chemical engineering project conversion unit.
Technical innovation point of the utility model
(1) The pressure drop of the heat exchanger is small: under the same air inlet condition, the pressure drop of the tube shell side of the heat exchanger of the utility model is 1/4 of a single U-shaped tube heat exchanger with the same diameter.
(2) Two single U-shaped tube heat exchangers with smaller length-diameter ratio are combined into a heat exchanger with proper length-diameter ratio and attractive appearance, and the short and fat design of adopting a single U-shaped tube is avoided.
(3) Compared with the traditional parallel heat exchanger, the heat exchanger of the utility model can obviously reduce the equipment cost.
Drawings
Fig. 1 is a schematic structural diagram of a double U-shaped tubular heat exchanger provided in this embodiment.
Fig. 2 is a schematic structural diagram of two conventional U-tube heat exchangers connected in parallel.
The reference numbers illustrate: a tube box 1; a tube sheet 2; a U-shaped tube bundle 3; a housing 4.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. All other embodiments, which can be derived by a person skilled in the art from the examples of the present invention without any inventive step, are within the scope of the present invention.
As shown in fig. 1, in the double U-tube heat exchanger of this embodiment, two parallel horizontal U-tube heat exchangers are combined back to form a piece of equipment, the tube box 1 is located at the left and right sides of the equipment, the middle is the heat exchanger shell 4, and the two tube boxes 1, the tube plate 2, and the U-tube bundle 3 are arranged back to back 180 degrees.
The heat exchange medium is divided into two parts before entering the tube pass and the shell pass for heat exchange, so the heat exchange working conditions of the double U-shaped tube bundle 3 are completely the same: the technological parameters, such as inlet and outlet temperature, pressure, medium, heat load, design temperature, design pressure and the like, are completely the same; the structural parameters of the tube box 1 and the tube plate 2 are as follows: the size, thickness, material and the like, and the structural parameters of the heat exchange tubes, such as the diameter, the wall thickness, the tube length, the number of the heat exchange tubes, the tube arrangement mode, the material and the like, are also completely the same.
Working example 1
Some 10 hundred million Nm3The raw gas preheater of the coal-to-natural gas project conversion unit comprises a tube pass medium which is crude gas, the flow rate of the raw gas is 360000kg/h, the inlet temperature is 237 ℃, and the outlet temperature after heat exchange is 255 ℃ (the initial stage)/285 ℃ (the final stage); the shell-side medium is shift gas, the flow rate is 360000kg/h, the inlet temperature is 448 ℃ (initial stage)/459 ℃ (final stage), and the outlet temperature is 412 ℃ (initial stage)/459 ℃ (final stage).
The comparison group 1) adopts the traditional single U-shaped tube heat exchanger, and when the pressure drop is not controlled, the parameters of the heat exchanger are as follows: diameter phi 1600mm, heat exchange tube specification: phi 25 is multiplied by 2 is multiplied by 6000mm, and the number of the heat exchange tubes is as follows: 587U, heat exchange area: 553m2. Pressure drop of the heat exchanger: tube side 62kPa, shell side 82kPa, total pressure drop 144 kPa.
And a control group 2) adopts a traditional single U-shaped tube heat exchanger, the tube-shell pass pressure drop is controlled within 50kPa, and the heat exchanger parameters are as follows: diameter phi 1900mm, heat exchange tube specification: phi 25 is multiplied by 2 is multiplied by 4000mm, and the number of the heat exchange tubes is as follows: 811U, heat exchange area: 509m2. Pressure drop of the heat exchanger: 29kPa on the tube side, 36kPa on the shell side and a total pressure drop of 65 kPa.
Control group 3) as shown in fig. 2, 2 traditional single U-tube heat exchangers were designed in parallel, and the parameters of the single heat exchanger were as follows: diameter phi 1600mm, heat exchange tube specification: phi 25 is multiplied by 2 is multiplied by 3000mm, and the number of the heat exchange tubes is as follows: 585U, heat transfer area: 304m2. Pressure drop of the heat exchanger: 22kPa on the tube side, 12kPa on the shell side, total pressure drop34kPa。
4) The parameters of the double U-shaped tubular heat exchanger are as follows: diameter phi 1600mm, heat exchange tube specification: (φ 25X 2X 3000mm) x 2, number of heat exchange tubes: 585 ux 2, shell side tangent length: 6600mm, heat exchange area: 600m2. Pressure drop of the heat exchanger: 12kPa on the tube side, 22kPa on the shell side and a total pressure drop of 34 kPa.
The total pressure drop of the novel double U-shaped tubular heat exchanger in the embodiment is reduced by 110kPa and 31kPa respectively compared with the comparison group 1) and the comparison group 2) as well as the comparison group 3). The reduced pressure drop is converted into the power consumption of the compressor which is 526kW and 149kW respectively, and the electricity saving fee is 210.4 ten thousand yuan and 59.6 ten thousand yuan per year according to the consideration of 0.5 yuan/kW.h and 8000h of annual operation.
In summary, the double U-tube heat exchanger of the present embodiment is an optimal solution in design.
In addition, in the aspect of equipment design and manufacture, compared with the traditional U-shaped tubular heat exchanger, the novel double-U-shaped tubular heat exchanger has no special requirements on manufacturing and processing.
The heat exchanger is a gas-gas heat exchanger, and is particularly suitable for working conditions of large volume flow of heat exchange media and large heat exchange temperature difference, such as a feed gas preheater, a steam superheater and the like of a large-scale coal chemical engineering project conversion unit. Compared with the traditional single U-shaped tubular heat exchanger, the heat exchange tube has the characteristics of small pressure drop, difficult vibration of the heat exchange tube, small equipment investment, small occupied area, attractive appearance and the like.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are intended to be covered by the scope of the present invention.
Claims (4)
1. The double-U-shaped tubular heat exchanger is characterized in that the heat exchanger is a horizontal double-U-shaped tubular heat exchanger, the heat exchanger comprises two sets of same U-shaped tube bundles (3) and corresponding tube boxes (1) and tube plates (2), the two sets of tube plates are connected through the same shell (4), the two sets of tube boxes (1) are respectively positioned on the left side and the right side of equipment, a heat exchanger shell (4) is arranged in the middle of the heat exchanger, and the two sets of tube boxes (1), the tube plates (2) and the U-shaped tube bundles (3) of the heat exchanger are symmetrically arranged back to back at 180 degrees and are mirror images of each other and are arranged in one heat exchanger shell (4).
2. A double U-tube heat exchanger according to claim 1, wherein the two tube cassettes (1), the tube sheet (2) and the U-tube bundle (3) are identical in structure.
3. A double U-tube heat exchanger according to claim 1 wherein the heat exchanger is a gas-gas heat exchanger, the tube-side and shell-side streams are both in gas phase and are split equally into two streams, each of which is half the total gas flow, before entering the heat exchanger.
4. A double U-tube heat exchanger according to claim 3 wherein the tube side fluid enters from the tube box inlets at both ends of the apparatus and exits from the tube box outlets at both ends after heat exchange; the shell-side fluid enters from two pipe orifices at two ends of the shell, is converged into one in the middle after heat exchange, and flows out from the same outlet in the middle of the shell, so that the heat exchange working conditions of the tube-side fluid and the shell-side fluid in the two sets of U-shaped pipe bundles (3) are completely the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120903782.5U CN215893330U (en) | 2021-04-28 | 2021-04-28 | double-U-shaped tubular heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120903782.5U CN215893330U (en) | 2021-04-28 | 2021-04-28 | double-U-shaped tubular heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215893330U true CN215893330U (en) | 2022-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120903782.5U Active CN215893330U (en) | 2021-04-28 | 2021-04-28 | double-U-shaped tubular heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215893330U (en) |
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2021
- 2021-04-28 CN CN202120903782.5U patent/CN215893330U/en active Active
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