AUTO-CHEMICAL CONTROL OF THE STEAM AND WATER CIRCUIT OF THE TEC
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COMPLEX OF AUTOCHEMICAL CONTROL OF WATER-CHEMICAL REGIME OF A GAS TURBINE UNIT WITH A COMBINED CYCLE
- POWER 330 MW
- BLOCKS 1,2
- Technological design of AMZ's waste metallurgical gas power units developed by MITSUBISHI
- «PJSC «Alchevsk Iron and Steel Works»
Initial data
As part of AMK's modernization program, the company built an electric power complex based on combined cycle gas turbines (CCGTs) that use exhaust coke oven, blast furnace and converter gases as fuel. The project includes two CCGTs with a capacity of 150 MW each.
A combined-cycle gas turbine (CCGT) consists of both gas and steam turbines. This combination ensures an increase in the overall energy productivity of the gas turbine unit through the use of exhaust gases.
Technical solutions adopted
According to the developed project, AMK CHP operates an Automatic Chemical Control System (ACCS) and a Laboratory Chemical Control System (LCS), which are part of a single integrated system (SIS). The AMK PEWSh also includes automatic analyzers, sample preparation devices (SPDs) and an information collection and processing system designed to enter data based on the results of the ACC LCC and present general processed information on the overall chemical monitoring of the plant.
Functionality of AHC VCR
entering data based on the results of the LCC AQC and presenting the general processed information on the management of water pollution control in the whole CHP plant
Issuance of alarms in case of violation of the water-chemical regime;
Early warning of possible emergencies;
Supplying information to the automated process control system for blowdown control, replenishment of the steam and water circuit with purified water, reagent dosing, etc.
Improving reliability and safety
Timely response to:
- increase in electrical conductivity,
- pH deviation,
- increase in the concentration of impurities
avoids emergency modes and unscheduled shutdowns
Advantages of the ACC VCR
- extends the life of the equipment
- ensures stable steam quality
- reduces operating costs
- Improves the overall reliability of power units
SCHEME OF ONLINE CHEMICAL MONITORING OF THE POWER UNIT WITH SAMPLING POINTS.
1 - Raw water; 2 - demineralized water outlet; 3 - water; 4 - water treatment plant; 5 - purified water; 6 - condensate; 7 - condensate outlet for polishing; 8 - feed water; 9 - boiler water; 10 - saturated steam; 11 - superheated steam; 12 - cooling water; 13 - return condensate; 14 - waste water; 15 - reuse
Optimization of the water-chemical regime
Thanks to automation:
- Reduced purge water consumption,
- Reduced consumption of reagents,
- The overall efficiency of the plant is increased.
Control parameters
- oxygen
- sodium
- conductivity - specific and acidic
- pH
- phosphates
- silicon
- hydrazine
AMI Sodium P
High-performance sodium analyzer for continuous monitoring of dissolved sodium in alkaline water samples with pH ≥ 7.0
AMI Silica
High-performance sodium analyzer for continuous monitoring of dissolved sodium in alkaline water samples with pH ≥ 7.0
Dissolved oxygen trace analyzer in high-purity water with integrated monitoring and auto-calibration.
AMI-II pH/Redox QV-Flow
Precise analyzer for monitoring pH or redox potential (ORP) for ultrapure, low-conductivity water systems
AMI Deltacon Power
Two-channel analyzer for determination of specific (total) conductivity and cationic (acid) conductivity with cation exchange column
AMI Oxytrace QED
Membrane-free amperometric instrument for precise control of hydrazine/carbohydrazide.
Equipment for the preparation and cooling of samples of the gas turbine unit with a combined cycle AMC
Sentry® Single Line Sampling Panels are pre-assembled units used to simplify the conditioning of steam, water, or safe process samples. Using cooling water, safe and representative samples can be obtained from individual sampling points located at remote locations in the plant or centrally in one room.
The CWIS Water Isolation Skid system controls temperature to within ±4°F (2°C) with the ability to fine-tune temperature to within ±1°F (0.5°C).Maintaining flow is easy with optional CWIS dual pumps, manual controls and automatic switching functions.
The TCU cooler can operate with capacities from 3 to 15 tons. Clear displays, warnings and alarms allow you to know exactly what is happening. TCUs can be manufactured for outdoor use without compromising performance and functionality.