Coke Drum - Temperature Monitoring

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Introduction

ISA 100 WirelessDelayed Coker is a type of coker who's process consists of heating residual oil feed to its thermal cracking temperature in a furnace. The most important variable in industrial furnace control is temperature. Temperature is measured throughout the furnace in different zones and temperature effects the materials being manufactured and therefore must be precisely monitored to prevent deviations in quality of the final product.

refinery

Benefits

  • Minimized plant startup time and downtime
  • Improved product quality, continuous temperature monitoring leads to improvement of the product quality
  • Reduced maintenance effort (NO wires, NO routing problems, NO cable maintenance issue)
  • Optimized fuel consumption and reduced operation cost (OPEX)
  • Reduced total power consumption, low power consumption devices enable cost savings
  • Enabled easy integration with existing host system, industry proven Modbus platform enables easy and seamless integration with a wide range of host systems

Requirements

  • furnaceCoker tube furnace is the heart of the delayed coking process. The heater provides all the heat in the process. The output temperature of the furnace is typically around 500 degree C.
  • Temperature monitoring is required due to the following reasons:
    • Coker furnaces are designed to have a constantly rising temperature gradient to reach the thermal cracking temperature quickly and thus optimize the fuel consumption.
    • The burners are controlled by the measurement of tube temperatures.
    • The furnace needs to be decoked or cleaned. Continuous operation of the cork drum forms a layer of insulation on the inner lining of the tubes resulting in the variation of temperature on the coke drum skin.
  • Delayed coking is one of the processes used in many refineries. Depending on the capacity, number of coke drums in operation varies from 4 to 8. Each coke drum will require up to 24 temperature points to be monitored.

Solution

3 transmittersThree YTMX580 multi input temperature transmitters were installed. Each of these accepts 8 temperature inputs and it reduces the quantity of transmitters required to only 3 on each coke drum. Field wireless access point was installed on the control room located 600m from the measurement area with dense obstructions. Two repeaters were used to establish redundant communication paths between the measurement devices and the field wireless access point. The field wireless management station was integrated with 3rd party host system using RS485 series Modbus communication.

The ISA100 wireless system provides an easy customizable GUI with deterministic topology monitoring for the operator. It identifies the wireless condition such as error rate of both primary and secondary communication paths to visualize communication quality.

 

Conclusion

  • Wireless solutions enabled reduction of huge bundles of cable running from the field to the control room.
  • High capacity Lithium Thionyl battery powered devices enabled savings in OPEX with proven battery life of better than 1.6 years with an update time of 10 sec for the temperature measurements (eight inputs).
  • Industry proven Modbus platform enabled easy integration with existing 3rd party host systems.
  • Wider application coverage ISA100 wireless minimized infrastructure which reduces installation time and expense, this is reflected as direct savings to the users.Frost & Sullivan 2014 Best Practice Award
  • Best in class signal availability of ISA100 wireless architecture with stable wireless connections proved to be a trustworthy wireless solution, perfectly meeting the user requirements.
  • Maintainable topology reduced the cost of ownership and enabled more points to be added as necessary in the future.

Yokogawa has a proven track record of delivering reliable, scalable and open technologies for a century. ISA100 wireless solutions address the specific challenges of the industrial automation industry while lowering cost ownership for our end users and maximizing their return on the investment.

 

行业

相关产品&解决方案

YFGW410现场无线管理站

YFGW410现场无线管理站以国际自动化协会(ISA)的工业自动化无线通信标准ISA100.11a为基准。该产品具有符合ISA100.11a标准的系统管理/安全管理/网关功能,与现场无线接入点(YFGW510)和/或现场无线媒体转换器(YFGW610)组合,构成现场无线系统。

YFGW510/YFGW520现场无线接入点

YFGW510/YFGW520现场无线接入点以国际自动化协会(ISA)的工业自动化无线通信标准ISA100.11a为基准。该产品具有符合ISA标准的主干路由器功能,与现场无线管理站(YFGW410)和/或现场无线媒体转换器(YFGW610)组合,构成现场无线系统。

YTA510无线温度变送器

高性能温度变送器YTA510接收热电偶、RTD、欧姆或DC mV输入信号。该变送器通过无线信号传输过程变量以及设定参数。该变送器采用内置电池,由于无需硬接线,因此可降低安装成本。通信规格以ISA100.11a协议为基础。

YTMX580多点输入温度变送器

YTMX580最多可接收8点测量输入值,如热电偶(8种类型:K、E、J等)或RTD信号(3种类型:Pt100等),并将相应的测量输入值转换为无线信号。它也可以接收DC电压、电阻和4~20 mA DC信号输入。

现场无线

无线解决方案的灵活性可减少对基础设施的投入,同时可以对工厂运营有更深入的了解。

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