Description

Ammonia storage level measurement

Требования к данной позиции измерения

  • Ammonia also in gas phase
  • reliable measurement

Description

Strainer resistance measurement

Требования к данной позиции измерения

  • Process control

Description

Plant air pressure monitoring

Требования к данной позиции измерения

  • Process control

Description

Strainer resistance measurement

Требования к данной позиции измерения

  • Process control

Description

Flow measurement of liquid ammonia

Требования к данной позиции измерения

  • Chemical resistance
  • Accuracy long term stability

Description

Flue gas temperature measurement

Требования к данной позиции измерения

  • Process control
  • Emission monitoring

Description

Pressure measurement of liquid ammonia

Требования к данной позиции измерения

  • Process control

Description

Monitoring of heat transfer section

Требования к данной позиции измерения

  • low measuring range, long term stability

Description

Mass flow measurement of gaseous ammonia

Требования к данной позиции измерения

  • Combined mass flow and density measurement
  • Monitoring of evapuration process

Description

Temperature measurement of diltuion gas

Требования к данной позиции измерения

  • Process control

Description

Flow measurement of dilution gas

Требования к данной позиции измерения

  • Process control

Description

Suppelemental fuel gas measurement

Требования к данной позиции измерения

  • longtime stability

Description

Flow measurement of each burner

Требования к данной позиции измерения

  • High dynamic flow rates
  • transient flows
  • fast response

Description

Differential pressure measurement across catalyst

Требования к данной позиции измерения

  • Process control

Description

Balancing of ammonia injection

Требования к данной позиции измерения

  • Process control

Description

Temperature measurement of supplemental fuel

Требования к данной позиции измерения

  • Process control

Description

Gas temperature measurement in HRSG duct

Требования к данной позиции измерения

  • dynamic calculations
  • fast response

Description

Fuel gas pressure control

Требования к данной позиции измерения

  • Process control

Description

Gas temperature measurement in HRSG duct

Требования к данной позиции измерения

  • dynamic calculations
  • fast response

Overview

HRSG exhaust gas flow in combined cycle power plant

Duct burners and NOx removal

The Heat Recovery Steam Generator (HRSG) is designed to operate at the range of gas turbine exhaust conditions and constructed of gas tight components such as the exhaust gas inlet ducting, the casing and the exhaust gas stack. The system also includes dedicated measurement instruments for performance monitoring purposes. The gas turbine exhaust gas flows through the inlet ducting and the HRSG before being guided to atmosphere, via the exhaust gas stack. In this specific design, the HRSG key element heating surfaces installed in the following order, in the direction of the exhaust flow: HP Superheater 2, Reheater, HP Superheater 1, HP Economizer 3, HP Evaporator, IP Superheater, LP Superheater, HP Economizer 2, IP Evaporator, HP Economizer 1, LP Evaporator, Condensate Preheater.

Selective Catalyst Reactor (SCR)

Where the emission requirements are stringent, an SCR or CO catalyst system is located in the exhaust temperature section of the HRSG. The purpose of the SCR system is to convert the oxides of nitrogen (NOx) produced by the combustion turbine and the burner system to nitrogen and water vapor. The system consists of an ammonia supply unit, distribution manifold, injection grid, and catalyst bed to create an SCR reactor section.

Duct Burner

Duct burners are used to burn natural gas or oil in the gas turbine exhaust stream to increase the gas temperature and thus increase the steam output, in case the energy available in the gas turbine exhaust is not sufficient to meet system demands. The duct burner heats the exhaust gas to up to 800˚C. Duct burner systems consists of duct burner elements, the pilot and pilot fuel supply with igniters, and the main fuel supply which includes scanners, fuel gas metering, a cooling air system and a burner measurement and control system.

The OPTIFLEX 2200 guided radar is a reliable and maintenance free TDR level meter suitable for the measurement and control of ammonia levels in the ammonia storage tank. OPTIMASS 6400 is a sophisticated Coriolis mass flow meter to monitor the dosing of the gaseous ammonia to the AIG. Furthermore the density information from the OPTIMASS can be used to monitor the flawless operation of the ammonia evaporation process. The OPTISONIC 7300 ultrasonic gas flowmeter can cope with intermittent operation and transient flow changes of the fuel gas flow to the duct burners. KROHNE offers sophisticated instruments and solutions from single flowmeters up to flow computers and complete fuel gas skids.

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