Fuel Gas Compressor Thrust Balancing Heating for Dust Collector Ice Prevention
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Solution Overview
Problem
Power plants using low-heating-value gases as fuel face challenges in cold regions where ice formation on dust collectors can lead to abnormal discharge and damage, requiring reduced gas turbine output to increase fuel gas temperature, limiting power generation.
Innovation Solution
The power plant employs the thrust-balancing gas from the fuel gas compressor to heat the fuel gas destined for the dust collection device using a nozzle, preventing ice formation and maintaining compressor efficiency without reducing gas turbine output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the gas turbine is operated at rated output, then power generation is maximized, but the fuel gas temperature at the dust collector becomes too low causing ice formation
Solution Approach 1:
The fuel gas flow is segmented into two paths: one path goes through the fuel gas cooler to the dust collector, while another path uses the high-temperature fuel gas from the compressor discharge to heat the cooled fuel gas before it reaches the dust collector. This segmentation allows independent control of temperature and flow distribution.
Solution Approach 2:
A heating line with a nozzle is introduced as an intermediary component between the fuel gas cooler and the dust collector. This heating line receives high-temperature fuel gas from the compressor discharge and injects it into the cooled fuel gas stream to raise its temperature, preventing ice formation without reducing turbine output.
2Temperature
If fuel gas is cooled in the fuel gas cooler, then the temperature is reduced to prevent ice formation, but the power generation level is limited due to reduced output
Solution Approach 1:
The system changes the temperature parameter of the fuel gas by introducing a heating mechanism that raises the temperature of cooled fuel gas before it reaches the dust collector. This allows the system to operate at lower temperatures during cooling while maintaining sufficient temperature to prevent ice formation, thereby maintaining power generation capability.
Solution Approach 2:
The high-temperature fuel gas from the compressor discharge is continuously used to heat the cooled fuel gas stream, ensuring continuous temperature maintenance without interrupting the fuel gas flow or reducing turbine output. This continuous heating action maintains both cooling effectiveness and power generation capability.
3Temperature
If the output of the gas turbine is reduced, then the fuel gas temperature can be increased, but the power generation level is limited
Solution Approach 1:
The system uses the high-temperature fuel gas from the compressor discharge (which would otherwise be wasted or used only for thrust balancing) to heat the cooled fuel gas stream. This self-service approach allows the system to maintain temperature without requiring external heating sources or reducing turbine output, as the fuel gas itself provides the heating energy.
Solution Approach 2:
The system recovers the high-temperature fuel gas from the compressor discharge that would otherwise be discarded or used only for generating thrust balancing force. This recovered high-temperature gas is utilized to heat the cooled fuel gas, converting a waste product into a useful heating medium and eliminating the need to reduce turbine output for temperature control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for increased fuel gas temperature at the dust collection device without reducing gas turbine output, preventing ice formation and maintaining compressor efficiency across a wider temperature range, simplifying the system and minimizing pressure loss.
Implementation Method 1
a fuel gas compressor (12) that compresses the fuel gas
Implementation Method 2
increasing the temperature of (heating) the fuel gas that is to be guided to the dust collection device (25) with the fuel gas (BFG) supplied from the fuel gas cooler (13)
Data Source
Figure 1
Figure 2
AI summary
An electric power generation plant (10) provided with: a gas turbine (11) using fuel gas as the fuel; a fuel gas cooler (13) for cooling, by means of cooling water, fuel gas which is pressurized by a fuel gas compressor (12) and recirculated; and a dust collection device (25) for separating and removing impurities from fuel gas led to the fuel gas compressor (12). The electric power generation plant is also provided with a heating means (51) for heating fuel gas, which is led to the dust collection device (25), using fuel gas utilized to cause an anti-thrust force to act on the rotor of the fuel gas compressor (12).