Issues with heat source modification at the bottom of the isobutane removal tower?

When using hot water at high temperature instead of steam as the heat source for the reboiler at the bottom of the isobutane removal tower, several key factors need to be considered: 1. **Temperature matching**: It is essential first to ensure that the temperature of the hot water is high enough to meet the heat requirements of the reboiler. If the temperature is insufficient, it may prevent the material at the bottom of the tower from reaching the required boiling point. 2. **Thermal efficiency**: Compare the heat exchange efficiencies of steam and high-temperature hot water to assess whether there will be an increase in heat losses, and whether such an increase will affect the overall operating costs and efficiency. 3. **Equipment modification**: Based on the configuration of the existing equipment, determine whether modifications to the pipelines or heat exchangers are necessary to accommodate the physical properties of high-temperature hot water. For example, it may be necessary to consider the pressure and temperature resistance of the pipes, as well as whether additional boosting from a circulation pump is required. 4. **Control system adjustment**: After switching the heat source, it may be necessary to adjust the existing control system to ensure the stability and controllability of heat supply. 5. **Safety and Monitoring**: Ensure that all safety devices such as safety valves, pressure gauges, thermometers, etc., are properly installed and calibrated to suit the new heat source system. 6. **Cost Analysis**: Conduct a detailed cost-benefit analysis, including renovation costs, operating costs, maintenance costs, etc., to determine the economic viability of such technical upgrades. 7. **Trial operation and optimization**: Before going into full operation, conduct thorough trial runs to check and adjust system parameters, ensure the stable operation of the entire system, and make optimized adjustments based on actual conditions. In short, replacing the heat source is a complex process that requires comprehensive consideration of various factors as well as careful planning. It is recommended to consult professional engineers and experienced operators before proceeding. .

Ensure that the temperature, flow rate, and pressure of the hot water at high temperature can meet the heating requirements of the reboiler. Check the stability and reliability of the high-temperature hot water system to prevent fluctuations or interruptions during heating.

When changing the heating medium for the reboiler at the bottom of the isobutane removal column from steam to hot water, the following points need to be considered: heat load matching – ensure that the heat load provided by the hot water is sufficient to meet the requirements of the reboiler. The heat capacity and flow rate of the hot water must be sufficient to provide heat equivalent to that of steam. Temperature control: The temperature of the hot water must be high enough to ensure the operating temperature of the reboiler. If the temperature is insufficient, it may affect the separation efficiency. A temperature control system needs to be installed to maintain a stable hot water temperature. Heat transfer efficiency: The heat transfer coefficient of steam is usually higher than that of hot water; it may be necessary to increase the heat exchange area or optimize the design of the heat exchanger in order to maintain the heat transfer efficiency. Pressure management: The pressure in the high-temperature hot water system must be matched to the operating pressure of the reboiler, in order to prevent excessive or insufficient pressure from affecting the proper operation of the equipment. Corrosion and scaling: Hot water can cause corrosion or scaling; it is necessary to use corrosion-resistant materials and to carry out regular cleaning and maintenance. System compatibility: Check whether existing devices are suitable for hot water, and modify or replace them if necessary. Energy efficiency: Evaluate the energy efficiency after switching to hot water to ensure a reduction in overall energy consumption. Safety measures: High-temperature hot water systems must be equipped with safety valves, pressure relief devices, etc., to prevent overpressure or overheating. Operation and maintenance: Train operators to become familiar with the new system and develop maintenance plans to ensure long-term stable operation. Economic analysis: Evaluates the economic viability of the renovation, including equipment investment, operating costs, and energy-saving benefits. In summary, switching to high-temperature hot water requires comprehensive consideration of factors such as heat load, temperature control, heat transfer efficiency, pressure management, corrosion protection, system compatibility, energy efficiency, safety, operation and maintenance, and cost-effectiveness.

For this operating condition, a high-flow tube heat exchanger can be considered; such heat exchange tubes require a smaller temperature difference during boiling conditions compared to plain tubes (15°C–30°C), with the temperature difference generally being around 10°C or less. The bottom temperature of this isobutane removal tower is generally kept between 60-70°C; hot water at a temperature above 80°C can be used. High-flow heat exchangers require less space than straight tubes