Flue Gas Duct Cooling Nozzle for Scrubber Protection
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Solution Overview
Problem
During non-operational phases of a power plant boiler, hot flue gas can damage the gas scrubber and downstream devices due to high temperatures, as the existing technologies do not effectively manage heat dissipation during maintenance or shutdowns.
Innovation Solution
A flue gas line spraying device is installed in the flue gas line connection between the power plant boiler and the gas scrubber, which sprays a cooling fluid, such as water, onto the flue gas before it enters the scrubber, using nozzles designed for uniform distribution and a fluid supply system with monitoring and control mechanisms to regulate the cooling fluid flow, preventing damage by reducing the temperature of the flue gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the power plant boiler is stopped for maintenance or repair, then maintenance work can be performed, but hot flue gas can damage the gas scrubber and downstream devices due to high temperature
Solution Approach 1:
The cooling fluid is applied to the flue gas before it enters the gas scrubber, during the shutdown period, to pre-cool the gas and prevent thermal damage to the scrubber and downstream devices. This preliminary cooling action occurs before the harmful thermal effect can manifest.
Solution Approach 2:
A cooling fluid (such as water) is introduced as an intermediary substance between the hot flue gas and the gas scrubber. This intermediary absorbs the excess heat from the flue gas, preventing direct thermal contact with the scrubber and protecting it from damage during maintenance shutdowns.
2Reliability
If a cooling system is installed to cool flue gas during shutdown, then damage prevention is achieved, but device complexity increases
Solution Approach 1:
The cooling fluid system serves multiple functions: it cools the flue gas during shutdown periods to prevent damage, and can also be used during operational periods for temperature control. The same cooling infrastructure protects the scrubber without requiring separate dedicated systems for different operational modes.
Solution Approach 2:
The cooling system utilizes the existing flue gas flow and temperature differential to provide cooling during shutdowns. The system automatically activates when the boiler shuts down, using the natural cooling demand without requiring complex external control mechanisms or additional energy input.
3Temperature
If cooling fluid is applied continuously, then flue gas temperature is controlled, but operational costs increase due to pump operation
Solution Approach 1:
The cooling fluid is applied periodically or intermittently rather than continuously. The system activates during shutdown periods when the boiler is stopped and deactivates during normal operation, eliminating the need for continuous pump operation and reducing energy consumption while maintaining effective temperature control when needed.
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
The cooling fluid effectively reduces the temperature of the flue gas, preventing damage to the gas scrubber and downstream devices, and reduces operational costs by eliminating the need for a circulating pump during non-operational phases, while maintaining efficiency and simplicity in installation and operation.
Implementation Method 1
the cooling fluid effectively reduces the temperature of the flue gas
Implementation Method 2
sprays a cooling fluid, such as water, onto the flue gas
Data Source
Figure 1
AI summary
The flue gas duct (16) is arranged in the region of the flue gas line (10) between the gas scrubber (12) and the power plant boiler, and is adapted to an operating phase. The cooling fluid is directed towards flue gas flowing into the flue gas line during non-operational phase of the power plant boiler. Several nozzles (18) are arranged in the transverse sectional area of the flue gas line. A flow rate monitoring unit (32) is provided for monitoring the amount of cooling fluid which is to be diverted. Independent claims are included for the following: (1) a gas scrubber; and (2) a method for treatment of flue gas.