Arroz Diana automates its largest plant in Colombia

“One of the biggest rice companies in the country, with nearly 50 years in the market, automates its process, providing agility to the operation and opening the most technified plant in the country”.

One of the most critical and essential activities that take part in the rice mill is the drying process, it is imperative to have control of the temperature and humidity of the paddy, to obtain better results and rice quality in the threshing zone. The traditional drying process have basics temperature controls for the oven and manual control of heat to batteries and towers (Drying systems).

The plant is located in Yopal, Casanare, it is the biggest of the Diana Corporation Group, which has a robust drying system, adaptable to ambient temperature and humidity conditions.

Ingetes S.A.S, Siemens Partner Solution, modernized and automated the entire drying system, with a solution that included the technology PLCs S7-1500, S7-1200, TP Comfort, KTP Basics, decentralized peripheries with profinet and profibus, Scada supervision system, WebUX and information server. The technologies used and the possibility of expansion of the system were important to carry out the project.

The system was divided into two topologies, the first implemented in 2015 and the second in 2016. The first topology architecture consisted of a PLC S7-1516 3PN/DP and a periphery IM 155-5 DP ST (56 digital inputs, 56 digital outputs, 64 analog inputs and 32 analog outputs), a TP900 Comfort and a TP1200 Comfort. A pre-installed system with 2 PLCs (each one with 8 digital inputs, 6 digital outputs, 5 analog inputs, thermocouple module, switch CSM 1277 and a USS communication module) and 2 displays KTP600 Basic, was integrated. All the devices were connected to a switch Scalance XB005.

The second topology architecture consisted of a PLC S7-1511 PN and a periphery IM 155-5 PN ST (40 digital inputs, 16 digital outputs, 32 analog inputs and 24 analog outputs) and two TP900 Comfort. A pre-installed system with 3 PLCs (each one with 8 digital inputs, 6 digital outputs, 5 analog inputs, thermocouple module, switch CSM 1277 and a USS communication module) and 3 displays KTP600 Basic, were integrated.

Control panels, programming and commissioning were carried out. The programming has manual and automatic operation, PLCs integration, process assurances, breaks, emergency stops, engineering values, alarms, management reports with the information server software for digitally support and align the process. With the WebUX is possible to visualize the SCADA from any point of the plant in cell phones, tablets and computers, which are in the network.

Some of the benefits obtained after automation are:

  • Decrease in operating times.
  • Improvement in the quality of the operator’s work and in the development of the process.
  • Reduction of costs, drying times, information processing times and the consumption of husk as fuel for the kilns.
  • Increase security and protection for workers.
  • Autonomous operation of the process.
  • Supervision and diagnosis of equipment, facilitating its maintenance.
  • Opening information to management levels.
  • Registration of process values in SCADA, storage in SQL databases.
  • Reports of the values in certain time ranges, graphs and tables, using information server. Generated by event or every certain period programmed.
  • Real-time visualization of the drying variables from any network point of the plant using the WebUX tool.

 

UNACEM Ecuador S.A

Planta Cementera, Otavalo

Review

UNACEM Ecuador (before “Lafarge Cementos”), is a company dedicated to manufacture cement. Their industrial plant is located in Otavalo, Imbaura province, Ecuador.  The plant provide two clinker kilns for their productive process. The line No. 1 has a pre-heater tower of four stages with a gases flow stream from the kiln; This process work with liquid residual combustible oil, pet coke and biomass. The Line 2 has a tower pre-heater of five stages, besides of pre-heater and tertiary air works with liquid residual combustible, solids (pet coke) and biomass.

In 2015, the Company received the Environment license of co-process waste dangerous products for cement kilns (Governmental agreement 048. Official register N° 439 of 3td of May   2011, from environment minister of Ecuador), turn into the first industrial plant of the country that could do this treatment  controlled For that,, UNACEM Ecuador supervised their emission gases continuously, mainly the concentrations of CO, SO2, NOx, VOC oxygen reference at 7%.

Design

For this CEMS in UNACEM Ecuador, was installed a complete system with field instrumentation. Through an analytics enclosure, which has gas analyzers units correspond to variables required, the control system doing the correction on line.

The stack emission gases of the line 2, was  selected a ring´s measurement where were installed the following instruments: a extractive sample heated probe BÜHLER, with a dust filter of 2 micros heated to 180°C to reduce condensates , an absolute pressure transmitter SIEMENS, SITRANS DSIII model; a RTD with a temperature transmitter in head.

The sample gas is transported approx., 30 meters length through a heated hose to the analytic enclosure. The analytic enclosure provided of 19 inches rack, double door with safety glass door each, auto-supportable and laterals removable.

In this enclosures was installed a ULTRAMAT 23 (U23) to measure CO, SO2 and O2; a HCT gas analyzer FIDAMAT 6; and NOx gas analyzer with chemioluminicence technology, it was required with Ecuatorian norms.

The sample conditioning systems (SCS) is composed of a dust filter 2 micras PTFE made, with moisture detector. In addition, a simple gas compressor cooler, with two gas stream, 320 kJ/h capacity, two peristaltic pumps to remove the condensation and drain it to a condensate tank of 6.5 lt capacity, with a high level switch installed; a sample gas pump diaphragm type with a needle valve to regulated the gas flow rate. Finally, a rotameter installed downstream to the inlet port of the U23 with a parallel connection with the outlet port.

Secondly, the analog outputs of U23 of the gas concentration conditioned through a PLC SIEMENS S7-1200, at 7%  O2 and communicated (PROFIBUS DP) to a DCS SIEMENS, PCS7 based, called CEMAT.

The control system is also in charge of validating the starting conditions of the gas outlet; for example, check the temperature of the probe and heated hose is maintained at 180 ° C, the cooler temperature reaches 5 ° C, there is no humidity in the sample line and the high level sensor with condensate tank not be activated. Those validations connected in series to enable the operation of the suction pump sample gas.

The display of process variables showed on a touch screen display, SIEMENS, KTP-700 model, second generation of 64K color. It allows you to see the starting up sequence changing the color of each instrument according to their status. In addition, let see trends in real-time gas concentrations of both raw variables as the corrected, logging alarms gas concentration levels as the levels allowed by the Ecuadorian Standard. Finally show an explanatory menu helps each deployment, with the ability to view excerpts from text documents such as standards and technical articles on the continuous measurement of gases.

 Advantages.

 The proposed design was very versatile and flexible in the assembly system in Colombia, reducing transportation costs and implementation. Likewise, the control equipment used in Siemens SIMATIC (S7-1200 PLC) line and its monitoring screen “touch screen” KTP-700, become strong, the control system and improve undoubtedly the presentation of the process variables discrete and analog system signals.

Additionally, the control system has wide potential offered by communications integration with existing systems, or by RS-485 networks via PROFIBUS-DP, Ethernet or PROFINET networks.

Conclusions

The solution offered, integrates the best SIEMENS product solutions in different segments, under the concept of TIA (“totally integrated automation”). The pressure transmitter SITRANS DSIII, gas analyzers ULTRAMAT 23 and FIDAMAT 6, the S7-1200 control system, KTP 700 display 7 “high resolution color and all its accessories electrical connection of the SIRIUS family, allow a solution CEMS integral and open as it is robust and differentiating CGA’s market.