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This post was last edited by MTO001 on 2022-4-4 10:26. Comparison of different steam heater processes in chemical equipment. In chemical production, there are many process options for steam heaters. Different processes have different amounts of steam used when providing the same heat load. The following is a comparative analysis of three different heating processes. 1. Comparison of different process flows (the complete control loop is not shown in the simplified diagram) Table 1: Steam consumption comparison No. Process steam parameters Condensate parameters Heat load Steam flow Annual consumption MPaA℃kJ/kgMPaA℃kJ/kgMW/hKg/h tons 1A0.51522747.50.51526405854168327 2B0.18117490.75797663807 3C0.3133561.45823465870 Taking process B as the comparison standard, the steam consumption of process A is +4520 tons and process C is +2063 tons. Table 2. Equipment and Instrument Quantity Serial Number Process Flow Heat Exchanger Condensate Tank Pump Regulating Valve 1A1001 2B101 (Pump Trap) 1 3C1102 From the perspective of equipment and instrument investment, process A has the least investment, and process B (including pump and trap system) has the most. msohtmlclip1/01/clip_image008.jpg Figure 1: Condensate conveying device (pump trap) 2. System impact comparison: 1. Effects of steam pressure fluctuations on different processes msohtmlclip1/01/clip_image010.jpg Figure 2: Process A red line 1: (Process material) Sensitive plate temperature (Process B) ； orange line 2: Steam system pressure ； Yellow line 3: Steam flow (process B) ； cyan line 4: Regulate the steam pressure after the valve (process B). blue line 5: Steam heat exchanger liquid level (process C) purple line 6: The temperature of the process material to be controlled (process C) can be seen from the above figure. When the steam pressure fluctuates, the temperature of the process medium that needs to be heated is well controlled without significant fluctuations, and the liquid level control is also stable. file:////msohtmlclip1/01/clip_image012.jpg/01/clip_image014.jpg图三：流程B红色线：（工艺物料）灵敏板温度；橙色线：蒸汽系统压力；黄色线：蒸汽流量；蓝色线：调节阀后的蒸汽压力。由上图可以看出，蒸汽压力波动时，蒸汽流量跟踪效果不是太好，温度控制波动不是太大。工艺介质温度控制不如流程A（参考图二）。ffile:///al/Temp/msohtmlclip1/01/clip_image018.jpg图四：流程C红色线1：蒸汽流量；橙色线2：（工艺物料）灵敏板温度；黄色线3：凝液水罐液位；蓝色线4：蒸汽压力。由上图可以看出，蒸汽压力波动时，蒸汽流量波动较大，凝结水罐液位波动较大（此罐经常满罐），加热介质温度波动较B大，控制不稳。2、 Impact on the steam condensate system Process A: The steam condensate pressure is high, and the condensate is sent out smoothly. When the back pressure fluctuates, it has little impact on the condensate sent out. Process B: The steam condensate is pressurized and sent to the condensate system by driving nitrogen. The delivery is intermittently. The delivery volume of a single group is limited (one set is equipped with 3-4 groups). If the heating demand is large, multiple sets of pump traps need to be used. When overloaded, heating demand will be affected and water will overflow to the site. Process C: The steam condensate pressure is lower than that of process A. If the condensate filter is not full of liquid, it will easily cause water hammer in the condensate system. When the back pressure of the condensate system becomes high, the condensate delivery is not smooth. . 3. Comprehensive analysis and comparison of operation and maintenance costs. Process A: The least investment, the highest energy consumption, and relatively good operation. No daily maintenance costs. Process B: The highest investment (pump and trap system) and less energy consumption. The pump trap operates more stably and requires less maintenance. Process C: The investment is relatively low, the operation is unstable and prone to water hammer, and the energy consumption is average. This article has been published on the public account: Chemical Engineering Work Notes