Study on heat tracing design of chemical titanium pipe

With the continuous development of the times, China’s social economy has shown a high-speed and stable development trend, on the basis of which people’s living standards are constantly improving. China has always attached great importance to the development of the chemical industry, and now the chemical industry has become an important part of China’s rapid economic development. Compared with other industries, the chemical industry has certain complexity, and some chemical reactions also have certain risks. The chemical process is complicated, which requires not only normal energy but also some additional energy supply to ensure the smooth progress of the whole reaction process. For chemical process, heat tracing design has become an indispensable part. If the heat tracing design is missing, it will seriously affect the normal development of chemical process. In this paper, the heat tracing design is analyzed in detail in the specific research process.

0. Introduction

The heat tracing design of chemical titanium pipe is a very rigorous process. In the design process, it is necessary to fully consider the actual development situation and devote to designing the most reasonable scheme to ensure the smooth progress of chemical process. There are many forms of pipe heat tracing in chemical process, and the specific form of heat tracing shall be determined according to the actual situation. The heat tracing components of the pipeline are also more complex, so we should grasp each design link in the design process to improve the feasibility of the design scheme. Designers should start from many aspects, innovate the original design mode based on actual conditions, actively learn advanced design concepts, and master the connotation of heat tracing design of chemical titanium pipes.

1. Overview of chemical titanium pipe heat tracing

According to the current actual development, there are various forms of heat tracing, but the most common and widely used heat tracing forms are mainly divided into three types, namely, the use of jacketed pipe, electric tracing band and tracing pipe. These three forms have their own advantages and disadvantages. The specific form to be selected depends on the actual situation. For these three different forms of heat tracing, the heat tracing carriers are respectively hot oil, steam and hot water. Under different circumstances, the selected heat tracing form has unique characteristics. In other words, in the process of chemical process work, only one heat tracing form can be selected. In the process of chemical production, tracing pipes and jacketed pipes are widely used. Because these two forms of tracing have a long service life and do not require excessive costs, they are widely welcomed by people.

2. Composition analysis of chemical titanium pipe heat tracing

2.1 Heat tracing distribution station

The main function of the heat tracing distribution station is to provide corresponding energy for the whole heat tracing. In the process of designing the heat tracing distribution station, the following four aspects must be paid attention to. First of all, the distribution station should be equipped with a corresponding frame, and the role of the distribution station can be fully played only when the two are used together. It is worth noting that the frame must be set as a sliding frame. Secondly, the distribution station shall be set at the low point and equipped with steam trap device. In the specific production development process, the distribution station of tracing steam cannot be used at the same time as the tracing station of the pipeline, and only one of the two can be selected. The designer shall ensure the stability of the distribution station during the design of the heat tracing distribution station. In order to better improve the stability of the distribution station, it shall be designed as close to the wall as possible. Designers also need to scientifically and reasonably allocate the lines of the tracing pipes. On the basis of meeting the actual use needs, shorten the tracing pipes as much as possible. Such pipes can not only ensure the stability of the distribution station, but also reduce the cost input.

2.2 Heat tracing pipe

For the heat tracing pipeline, the most important component is the heat tracing design of chemical titanium pipeline. The designer should have a high design ability and fully consider the actual situation in the early stage of design, so as to ensure the scientific rationality of the heat tracing design of chemical titanium pipeline. In the process of design, designers need to grasp the design points. The following five aspects are the most critical points in the heat tracing design.

• (1) In the process of designing the position of the titanium globe valve in the gas supply header, its position should be set at the outlet of the header. If the position is set at other places, the normal operation of the titanium globe valve in the gas supply header will be affected. In addition, a titanium globe valve should be installed on the titanium globe valve in the header.
• (2) In the process of designing the tracing pipe, the tracing pipe may not be connected smoothly. In order to avoid this situation, some designers will add titanium elbow design in the design process and innovate the original design drawings. Although on the surface, the problem of poor connection can be solved by adding titanium elbow to the pipe, simply adding titanium elbow will lead to new resistance in the pipe, In addition, some leakage points may occur during welding. On this basis, the designer should optimize the design pipeline of titanium elbow and add other designs appropriately to improve the deficiencies in the design of titanium elbow.
• (3) Titanium reducers are widely used in heat tracing pipe design. At present, the two most widely used reducers are titanium concentric reducers and titanium eccentric reducers. Titanium concentric reducers are suitable for vertical pipelines because they can point to pipelines of different diameters. The titanium eccentric reducer is more suitable for horizontal pipelines. The role of titanium eccentric reducer is to effectively reduce the phenomenon of condensate, and to reasonably control various parameters, including temperature parameters and speed parameters.
• (4) The designer shall fully consider the requirements of oil, steam and sealing degree in the specific design process. If the actual situation has high requirements for these, titanium plunger valve shall be used in the specific design process. The service life of titanium plunger valve is much longer than that of titanium globe valve. The reason for the long service life is that titanium plunger valve is generally made of titanium and titanium alloy materials, so it is not easy to rust. The airtightness and oxidation resistance of the entire titanium plunger valve are very good.
• (5) There are many important components in the design of titanium pipeline, the most important of which is the titanium tee. The application of titanium tee can effectively reduce the bifurcation in the gas transmission process. The designer should set the titanium tee at the upward position during the design process, which can effectively reduce the blockage of condensate.

3. Analysis of heat tracing design of chemical titanium pipe

3.1 Selection principle

In the process of pipeline heat tracing design, designers must follow the corresponding design principles, so as to ensure the scientific rationality of the entire design scheme. The freezing point temperature shall be fully considered during the selection of heat tracing of tracing pipe, and different tracing pipes shall be selected according to different temperatures. In the specific design process, if the freezing point of the medium is lower than 100 ℃, the half pipe and half heat pipe can be selected in the process of selecting the tracing pipe. If the freezing point of the medium is lower than 40 ℃, the pipe with warm water tracing can be selected, and the pipe with warm water mixing shall ensure that the warm water can always show a slow flow state. If the gas is prone to solidification reaction in the specific transmission process and will be attached to the pipe wall, then the steam tracing pipe can be used at this time, because the steam tracing pipe has higher heat.

3.2 Selection of tracing medium

In the process of selecting the tracing medium, full consideration should be given to the actual situation. Compared with other design links, the selection of semi tubular medium is relatively simple. At present, the most common tracing medium are hot water, steam and medium oil. When selecting heat tracing medium, the specific temperature of heat tracing shall be fully considered, and the most reasonable heat tracing medium can be selected according to the temperature. If the overall operating temperature is not high and there is no great demand for heat, hot water can be used as the heat tracing medium. If the temperature is always lower than 150 ℃ in the specific operation process and heat is needed only in a short time, steam can be used as the tracing medium. If a large amount of heat is required in the specific operation process, and the whole operation process is under high temperature for a long time, then the medium oil can be used as the tracing medium. In a word, the actual situation and the actual demand for heat must be fully considered in the process of selecting the tracing medium.

3.3 Design requirements for steam tracing pipe

From the current actual development, the heating medium of the heat tracing pipe is generally steam, and the pressure range of the steam is 0.5-1.2MPa. Most designers will directly design the diameter of the tracing pipe between 16-80mm in the early design process. Although such parameter design can meet the specific use needs, they want to better save data and reduce the loss of the pipe wall, The diameter of the tracing pipe should be designed between 20-30mm, which is the most practical diameter design. In addition, the pressure of the neat heat tracing pipe is not unchangeable, and it needs to be adjusted appropriately according to the change of the freezing point.

3.4 Design of tracing pipe working drawing

In the process of designing the accompanying pipe working drawing, the designer needs to use three-dimensional design of the pipe, and input the corresponding parameters into the pipe drawing. After the parameters are input, the simulation operation can be carried out. Designers need to repeatedly check the theory applied in the design, and actively apply the theory to verify the practice, so as to ensure the accuracy of the entire design scheme. In the process of model design, designers should not be in front of or behind the tracing pipe. In addition, cross experiments should be carried out for the designed pipeline, heat source and hot medium. Only through this kind of titanium pipe can the most appropriate design scheme be selected.

3.5 Heat compensation design of tracing pipe

In order to better perform thermal compensation, the designer should set a compensator every 20m or so in the design, and the selection of compensator is also very careful. At present, the widely used compensators are U-type compensator and Ω type compensator, and the specific type of compensator depends on the actual situation. During the design of the fixing point of the tracing pipe, it shall be ensured that it will not affect the insulation structure. The pipes bundled with straps are very suitable for the fixing point of the tracing pipe.

4. Analysis of problems needing attention in the design of chemical process heat tracing

Designers should focus on some key design links in the process of heat tracing design of chemical titanium pipes, and pay attention to the following aspects in the design process, so as to ensure the scientific rationality of the entire design scheme. First of all, it should be noted that the steam of the tracing pipe should always be drawn from the top of the main steam pipe. If the steam of the tracing pipe is not drawn from the top of the main steam pipe or is drawn intermittently from the top, normal production and operation will be affected. Secondly, in the process of design, an independent steam trap device must be set between each pipe. This design can facilitate the disassembly and assembly of the pipe. The shut-off valve should be set at the leading out position, and it is more suitable to be set on the horizontal pipe. This design mode can better centrally discharge the condensate. Some designers will directly set a bypass valve next to the drain valve in the process of design, but this design of the pipeline is easy to cause gas shock, because steam will have different degrees of channeling, so in the specific design process, bypass valves cannot be set next to the drain valve. At present, some designers like to add some elbow designs, especially the titanium U-shaped elbow. However, too many titanium elbow designs will not only affect the normal operation of the system, but also make the whole system too messy, which will also bring great difficulties to the subsequent construction. The construction unit needs to invest more costs. The design of titanium elbow will cause problems of liquid resistance and air resistance, and uneven energy distribution will occur in the heat tracing process. If the local heat is too high for a long time, the service life of the heat tracing pipe will be greatly reduced.
In the process of heat tracing design of pipeline, the reasonable layout of steam distribution station and drainage station is very important. If the design is not reasonable, it will directly affect the transmission efficiency and the normal discharge of condensate. In the design process, the radius should be three meters. If there are more than three hot spots in the range, the corresponding steam distribution station and drainage station should be set according to the actual situation. Such pipes can ensure the rationality of energy transmission.
The heat tracing design of chemical titanium pipes is a relatively complex process, and any small link will affect the final design results. Therefore, designers must do a good job in the design of details, master the design points, and avoid some mistakes in the design process.

5. Conclusion

To sum up, in the process of designing the heat tracing of chemical titanium pipes, the designers should adhere to the corresponding design principles and fully consider the actual situation to improve the rationality of the scheme design. Designers should keep pace with the times, actively learn advanced design concepts, and optimize and improve the original design pipeline. The reasonable design of chemical titanium pipe heat tracing can promote the better development of the chemical industry. On this basis, China’s social economy can also get more rapid development. In the future development process, the design means of our country will continue to improve, so that the heat tracing design will be more efficient.
Source: China Titanium Pipes Manufacturer: www.titaniuminfogroup.com