How to enhance process efficiency and profitability of water treatment systems in cooling towers by new controlling technology
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1 How to enhance process efficiency and profitability of by new controlling technology White Paper March 2009
2 How to enhance process efficiency and profitability of water treatment systems in cooling towers by new controlling technology Dr. Egon Hüfner, Segment Manager Water, Bürkert Fluid Control Systems Water treatment systems in cooling towers are dynamic entities that are subject to numerous factors like varying operating and environmental conditions, seasonal alteration in water chemistry, and compliance with tightening environmental regulations. Securing the requested water quality requires continuous control of source water, and permanent surveillance of the treatment process. At the same time, analysis requirements and compliance with environmental provisions create a growing need for analysis recording and transmission of relevant data concerning water output and quality. The automation of water treatment systems reduces costs. It increases productivity, saves water and energy, and minimizes the risk of chemical overfeed or underfeed while simplifying compliance with environmental standards. Water treatment systems for cooling towers can be controlled manually when water quality and operating conditions are consistent. Samples then have to be taken regularly by technicians, who analyse the process conditions before determining the ratio between the supply of fresh water and chemicals 2
3 required. They adjust the ph, ORP (oxygen reduction potential), conductivity, alkalinity, hardness, corrosion and other factors. These steps require in-depth experience as well as time and manpower. Sometimes however, the initial conditions may not be simple enough: high personnel costs, scarce and expensive water resources, and inconsistent water quality may create a need for more than manual chemistry control. This is where multi-parameter transmitters have recently established themselves. They are used as inline signal conditioners, sending analogue inputs to PLCs (programmable logic controllers). However, as global competition increases for water treatment OEMs (original equipment manufacturers), these companies are driving their suppliers to incorporate multiparameter transmitters into single-platform, multifunction flexible controllers reducing controller and instrumentation costs in some cases by as much as 50 percent as well as saving water and chemical costs. Maximizing turns: The increasing concentration of minerals which is a result of water evaporation in cooling towers creates difficulties for heat exchange processes. Mineral deposits (scaling) in the pipes of heat exchangers affects their heat transfer performance. Bacteria too can produce organic residues (fouling), which also compromise process efficiency. The continual automatic measurement and control of ph, ORP, conductivity, alkalinity, hardness, corrosion and other factors avoid these problems. The use of an automated controller with integrated networking capabilities like Bürkert s new multi-channel mxcontrol 8620 in combination with the necessary analytical sensors, valves, flow transmitters and switch s, allow a normal conductivity only controlled cooling tower to go from a two turn system (ratio between water in and water out of a cooling tower) Bürkert s mxcontrol 8620 can be used in general process and chemical control applications such as cooling towers or reverse osmosis systems. It saves time and space by allowing parameterization and data logging of a wide number of control variants via an SD card slot, Ethernet interface or USB connection 3
4 to a seven or eight turn system. This increased number of turns means less water is required to remove the same amount of heat from the plant. Some water stressed regions have taken note of this and are even offering financial incentives for plants to upgrade their controller in an effort to conserve water. The central control unit regulates the feed of chemicals that prevent corrosion, scaling and fouling processes. Biocides for example are added over a predetermined period of time as determined necessary during an initial water analysis. An example of chemistry cost savings is the Biocide pre-bleed function. Continuous monitoring and effective control of biocides provide greater protection from harmful bacteria. Biocides preventing legionella, algae and other bacteria, are added periodically over a 2 week window. It is often the case when biocide chemicals are added, loop conductivity increases. This being the case, it is some times beneficial to bleed to a conductivity set point that is lower then normal. This is called the Biocide PreBleed Setpoint. To prevent bleeding expensive chemicals to drain, an internal interlock prevents the bleed valve from opening while chemicals and biocides are added to the system even if high conductivity set points are reached. In addition, a time delay lock out prevents the bleed valve from opening for a predetermined period of time after the chemical is added to ensure that the added biocide has maximum effective contact time in the system to kill all unwanted organics. Cooling system corrosion is another unwanted expense factor. Accurate ph and conductivity readings cannot always guarantee a low corrosion environment throughout the system. A corrosion sensor is often connected to the control unit. If a predetermined corrosion limit is reached, the control unit will shut down the ph dosing module and energize the general alarm alerting local maintenance to investigate. In addition, corrosion inhibitor chemicals can be added based on a feed water ratio automatically. Automated all-rounder With the development of mxcontrol 8620 a state-of-the-art modular multichannel control system Bürkert responded to the trend for full automation and cost saving. By allowing parameter setting of a wide number of control variants via an SD card, serial interface or modem connection, the mxcontrol 8620 saves time, space and equipment costs in cooling towers, as well as in boilers, dead end and cross flow membrane filtration systems. With the launch of the mx- CONTROL, users no longer have to select a model type that fits their specific application. Instead, via customised software and a standard SD card, the number of control variants is unlimited, making the mxcontrol a true onesize-fits-all solution. The mxcontrol 8620 is specifically designed for seamless integration into countless chemical or process control applications. Its modular design integra- 4
5 The mxcontrol 8620 is capable of processing up to four analogue, two RTD, and eight digital inputs as well as five relay and four digital transistor outputs and four optional analogue outputs a total of 23 I/O (model dependent) simultaneously tes multiple, customerselectable inputs and outputs (4-20mA, Pt100, digital, relay and transistor), combines these with various control parameters resulting in dozens of flexible configuration possibilities. In addition to normal chemistry control, the 8620 can also integrate control of a large number of traditional process variables such as pressure, temperature and level, removing the requirement in many automated systems for external devices to cover the same functions. Understanding the needs of the water treatment users, and combining these with the processing power of the mx- CONTROL, has led to the introduction of intelligent control of the water parameters that significantly reduces waste by avoiding unnecessary or untimely dosing and bleeding-off. The flexible control and easy adaptation to processes made possible by the 8620 controller are the result of a high-level software architecture, which enables all standard modules to be easily loaded by SD Card, serial interface or remote modem. Alternatively, the future possibility of Ethernet can be used to configure and set the parameters on the controller or down load historical data saved on the SD card. Local manual interface is also available where an operator can simply set and display all important variables and parameters via five soft-touch keys. Once this is achieved, sophisticated electronics and state-ofthe-art control algorithms ensure that optimum process control is maintained at all times with minimal operator intervention. Moreover, operating security can be tailored to individual applications, with three levels of human-machine interface available: Open Access, Operator Only Access, or Specialist Access. The key to this high level, automated control is a 32-bit micro-process controller, supported by an integrated 512 kb flash memory for parameter storage and additional languages. This enables the mxcontrol to support up to a maximum of eight active control loops with minimum sample periods of 100ms (50ms for 4 active loops). This could involve simultaneously processing of up to four analogue, two RTD and eight digital inputs, as well as five relay outputs, four transistor outputs and four analogue outputs. In addition, data 5
6 logging and parameterization uploading and downloading is possible via an SD memory card that fits into the front of the controller via an SD card slot. The modularity provided by the mxcontrol is virtually unlimited due to the unit s functionality and flexible software configuration possibilities. The primary functions include: Conductivity Control, which features on/off control or specific set point with PI(proportional integrator)-controlled continuous dosing through pulses, automatic or manual bleed off; Chlorine/Redox and ph control, both of which offer on/off control, and PI-controlled continuous dosing through pulses or analogue outputs; Flow Control and totalizing, with K-factoring; and Biocide Dosing over a 14-day program, featuring 8 dosing events for each of the two channels per day. These are complemented by additional features such as the display, transmission and recording of pressure, ph, ORP, conductivity, O2, CL2, level, temperature and TDS, frequency filter, password protection, alarm output, engineering units and an inverse function for on/off, proportional or PID control. Safeguarding the continuous operation of the mxcontrol against the elements is IP65 (NEMA 4X) ingress protection: this is effective when the door of the unit is closed. Further safeguards are provided by the unit s rugged screw terminals and cable glands; and by the 10-year service life of the replaceable lithium battery which backs up the mxcontrol s real-time clock. The controller meets EN and EN European EMC standards, the IEC 68 environmental directive, and is CE marked. UL/CSA approvals are pending. The Bürkert transmitter Type 8202 (left) is a compact and modular device specially designed for measuring the ph or O.R.P. value of fluids while the Type 8222 conductivity transmitter has 3 cell constant options for diverse applications 6
7 Contact Do you have questions or can we show you our newest controlling technology? Just contact Bürkert Fluid Control Systems Bürkert Werke GmbH Dr. Egon Hüfner Segment Manager Water Christian-Bürkert-Str Ingelfingen Germany Phone: Fax: Website: 7
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