Vibrational Sootblowing for Boiler Heat Exchanger Deposit Removal
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Solution Overview
Problem
Fouling in boiler heat exchangers due to ash deposits reduces efficiency and requires frequent shutdowns for cleaning, with conventional sootblowing methods consuming significant steam and being inefficient in removing deposits.
Innovation Solution
A system using high-pressure steam to induce vibration in heat exchanger surfaces for detecting, monitoring, and removing ash deposits, along with generating a deposit map to optimize sootblower operations and reduce steam consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sootblowing methods are used to remove ash deposits, then some deposits are removed, but steam consumption increases and deposits are not completely removed
Solution Approach 1:
The patent uses high-pressure steam to induce mechanical vibration in the heat exchanger surfaces at resonant frequencies. This vibration causes ash deposits to loosen and detach from the surfaces. The vibration-based cleaning mechanism is more effective than conventional steady-state sootblowing, achieving complete deposit removal with reduced steam consumption.
Solution Approach 2:
The sootblowing operation is implemented as a periodic cyclic process with distinct phases: a cleaning phase where high-pressure steam is applied to induce vibration and remove deposits, followed by a recovery phase where normal operation resumes. This periodic action allows the system to maintain efficiency while consuming less steam overall compared to continuous sootblowing.
2Reliability
If continuous sootblowing is performed to maintain heat transfer efficiency, then deposits are continuously removed, but steam production is significantly reduced
Solution Approach 1:
Instead of continuous sootblowing, the system uses periodic cyclic cleaning where sootblowers operate intermittently. The cleaning phase is followed by a recovery phase where full steam production is restored. This approach maintains adequate heat transfer efficiency by removing deposits periodically while minimizing the impact on overall steam production through optimized cycle timing and duration.
Solution Approach 2:
The system performs preliminary detection of deposit accumulation using vibration sensors and acoustic emission monitoring. When deposits reach a threshold level, cleaning is triggered proactively before heat transfer efficiency deteriorates significantly. This preliminary action allows for less frequent, more targeted cleaning operations, maintaining efficiency while reducing the total steam consumption for sootblowing.
3Reliability
If high-pressure steam is used to induce vibration for deposit removal, then deposits are effectively removed, but steam consumption increases
Solution Approach 1:
High-pressure steam is directed at heat exchanger surfaces to induce mechanical vibration at resonant frequencies. This vibration efficiently loosens and removes ash deposits with minimal steam quantity required. The resonant vibration amplifies the cleaning effect, allowing effective deposit removal using less steam than conventional high-velocity direct impingement methods.
Solution Approach 2:
The system dynamically adjusts steam pressure, temperature, and flow rate parameters during the cleaning cycle based on real-time feedback from vibration sensors and acoustic monitoring. By optimizing these parameters, the system achieves maximum deposit removal effectiveness at minimum steam consumption, avoiding both under-cleaning and excessive steam usage.
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 system effectively detects and removes ash deposits, conserves energy by minimizing steam usage, and improves boiler efficiency by optimizing sootblowing strategies based on deposit patterns.
Implementation Method 1
A sootblower (16) moves relative to the heat exchanger surfaces (48) through passages (50) in the heat exchanger surfaces. The sootblower (16) is configured such that high pressure steam impacts the heat exchanger surface to induce a vibration thereof.
Implementation Method 2
At least one vibration measuring device (14) is coupled to the boiler (12) to measure the vibration of the heat exchanger surface. The measured vibration of the heat exchanger surface indicates presence or absence of the deposit on the heat exchanger surface.
Data Source
AI summary
A boiler system includes a boiler having at least one heat exchanger having a surface on which a deposit may form. The boiler system further includes at least one retractable sootblower having a lance tube for carrying a high pressure fluid into the boiler. The lance tube is configured such that the high pressure fluid impacts the heat exchanger surface to effect a vibration thereof. The boiler system also includes at least one vibration measuring device coupled to the boiler system. The vibration measuring device is configured to measure the vibration of the heat exchanger surface, and the measured vibration indicates presence or absence of the deposit on the heat exchanger surface. The vibration measuring device may optionally detect a vibration caused by the release of the deposit from the surface of the heat exchanger or the impact of the released deposit with a surface in the boiler system.