Autochemical control of the steam and water circuit of thermal power plants and nuclear power plants
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Problems of steam and water circuits
- Corrosion and erosion
- Damage to the walls
- Transportation of iron to the boiler
- Deposits on pipes and turbine blades
- Overheating
- Violation of thermal insulation of boiler pipes
- Contamination of cooling water
- Increasing conductivity
- Lowering the pH of the feed water due to CO2
- Increase in operating costs for non-repair and reagents
What does modern online monitoring of the steam and water circuit provide?
Ensuring proper quality of demineralized water
Monitoring of potential sources of pollution
Protection of metal surfaces from permanent corrosion
Control of the chemical composition of the cycle (dosing)
Water purity control
and vapors
Formation of stable oxide layers on the surface of pipes and equipment
Preventing / minimizing the transport of oxidation products in the cycle
Good shutdown and preservation practices
Minimization
waste
Optimization of purging
boiler
Minimize the use of chemicals
Minimize and control wastewater discharge
Components of online chemical monitoring
SENTRY sample preparation systems
AUTO-CHEMICAL CONTROL OF THE STEAM GENERATOR AND CONDENSER
PROPOSALS FOR AHK
Regulatory documents on the requirements for automotive chemical control systems:
The composition and requirements for autochemical control systems (ACS) for feedwater and steam of power plants are regulated by international standards IAPWS and EPRI (Electric Power Research Institute, USA and Vereinigung der Grosskraftwerksbetreiber (Association of Large Power Plant Operators) (VGB) Germany).
Control parameters for the steam and water circuit
Conductivity: specific, after cation exchange, degassed after cation exchange: reduction of corrosion rate under the influence of acid residues and CO2
Dissolved oxygen: reducing the corrosion rate by dissolved oxygen () and identifying suckers
Hydrazine: controlling the optimal concentration of the corrosion inhibitor
pH
Prevention of corrosion and sedimentation on the surfaces of equipment and communications
Prevention of silica deposits on the turbine blades
Na+
tracking trends in the content of solid corrosion products in the water-steam cycle
total organic carbon - prevention of corrosion from organic acids
Н2
dissolved hydrogen in feed water, saturated steam and generator stator cooling systems (safety systems)
TURB
Turbidity: indirect control of corrosion intensity by the concentration of suspended solids
AUTOCHEMICAL CONTROL IN COOLING SYSTEMS FOR NUCLEAR AND THERMAL POWER STATIONS
Dissolved oxygen
Phosphates
Disinfectants Chlorine, monochloramines, hypochlorite.
Which steam and water cycle flows need to be monitored
- Raw water
- Demineralized water treatment plant
- Demineralized water yield
- Process water treatment facilities
- Purified water
- Condensate
- Condensate drainage for polishing
- Life-giving water
- Boiler water
- Saturated steam
- Overheated steam
- Cooling water
- Return condensate
- Waste water
- Reusability
We also offer systems for specific automotive chemical control tasks:
Sampling under vacuum
Blowing out the salt compartments of the steam generator
Generator stator cooling system
Hydrogen control in the generator stator cooling system (GSCS) at NPPs is critical for fire and explosion safety. It is based on the continuous automatic monitoring of the H2cap H sub 2 𝐻2 concentration in the turbine generator hydrogen circuit and the prevention of its penetration into the water circuit, which is regulated by standards such as pH (8.5 ± 0.5) and the O2cap O sub 2 𝑂2 limit.
Benefits for the client
Guarantee of trouble-free operation
Reduced operating costs
Reducing the cost of electricity production
Extend the service life
The price of the issue
✓ Cost of a 1000 MW steam generator 4 000 000 000 - 6 000 000 000 Euro
The cost of the AHU is 0.010-0.015% of the cost of the steam generator
✓The automatic chemical control system extends the service life of the steam generator by 20-30%
Our services
Preparation of the terms of reference
Development of technical specifications and project documentation
Manufacturing, supply and installation of equipment
Adaptation of the upper level of the AHC
Warranty and post-warranty support
Technical support during operation
why we
- 25 years of experience at NPPs
- Equipment from the world's leading manufacturers - SWAN ANALYTICAL and SENTRY EQUIPMENT
- SWAN ANALYTICAL automatic analyzers provide control of all parameters of NPP and CHP steam and water circuits regulated by international regulatory documents
- SENTRY EQUIPMENT sample preparation systems cover the entire pressure and temperature range for steam and water circuits
- System solutions: sample preparation, online control, analysis and data processing
- Where our autochemical control system works, turbines are safe!
- From the project assignment to the start-up and commissioning of the chemical plant
Experience and partners
«25 years of supplying chemical oxidation systems for NNEGC Energoatom»
Our offer
In the near future and immediately after the ceasefire, the restoration of the country's thermal power plants will be one of the most urgent tasks for economic recovery. Our offer for autochemical control systems for the steam and water circuit of thermal power plants is the most competitive and technically advanced in the domestic market.