Combustion Chamber Sieve Wall Temperature Shutdown for Limescale Protection
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Solution Overview
Problem
Existing fired heat exchangers suffer from damage due to excessive limescale buildup on the sieve wall of the combustion chamber, which reduces heat transfer efficiency and can cause overheating, and current maintenance practices are often ineffective as users fail to adhere to recommended shutdown and cleaning schedules.
Innovation Solution
A method involving an additional temperature sensor on the sieve wall connected to a control unit that monitors and compares the actual temperature with a predefined threshold, generating an alarm and automatically shutting off the heat exchanger when the threshold is reached, ensuring limescale removal and preventing further damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If limescale is allowed to accumulate on the sieve wall, then the heat exchanger operates continuously without maintenance shutdowns, but the sieve wall overheats and suffers damage
Solution Approach 1:
The patent applies preliminary action by installing a temperature sensor on the sieve wall before operation begins, and pre-programming the control unit with threshold temperature Tg. This allows the system to monitor temperature continuously and trigger an alarm before overheating damage occurs, enabling preventive maintenance shutdowns rather than waiting for actual damage to happen.
2Reliability
If users follow maintenance instructions to shut down and clean the heat exchanger regularly, then the sieve wall is protected from limescale damage, but operational downtime increases
Solution Approach 1:
The patent implements feedback by continuously monitoring the actual temperature Ta of the sieve wall with a temperature sensor and comparing it to the pre-programmed threshold Tg in the control unit. When Ta equals Tg, the control unit automatically generates an alarm signal, providing real-time feedback that triggers maintenance shutdowns only when necessary, rather than requiring fixed scheduled downtime.
3Reliability
If an additional temperature sensor and control system are installed to monitor sieve wall temperature, then reliable protection from overheating is achieved, but device complexity increases
Solution Approach 1:
The patent applies self-service by enabling the heat exchanger to autonomously monitor its own sieve wall temperature through the installed sensor and automatically trigger alarm signals through the pre-programmed control unit when threshold temperatures are reached, eliminating the need for external manual monitoring and intervention.
4Reliability
If the sieve wall temperature is continuously monitored and the system is automatically shut down at threshold temperature, then limescale accumulation is prevented from causing damage, but heat exchange efficiency decreases due to earlier maintenance cycles
Solution Approach 1:
The patent applies parameter changes by monitoring the actual temperature Ta of the sieve wall and comparing it against a pre-programmed threshold parameter Tg. This allows the system to operate continuously until the threshold is reached, optimizing heat exchange efficiency while preventing overheating damage, rather than using fixed conservative maintenance intervals that would reduce productivity.
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 solution provides reliable protection of the sieve wall from overheating and limescale damage by ensuring timely shutdown and maintenance, regardless of user compliance, thereby maintaining heat exchanger efficiency and extending its operational lifespan.
Implementation Method 1
the actual temperature Ta of the sieve wall of the combustion chamber is measured on the side of the water chamber using an additional temperature sensor
Implementation Method 2
Limescale is a good insulator, and when accumulated on the sieve surface it prevents heat transfer from the sieve surface to water
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The method of protecting the sieve wall of the combustion chamber of a fired heat exchanger is characterised in that before a fired heat exchanger (1) is started, the control unit (9) of the fired heat exchanger (1) is pre-programmed with a limit temperature Tg adopted for the sieve wall (5) of the combustion chamber (3), whereupon, during the operation of the fired heat exchanger (1) the actual temperature Ta of the sieve wall (5) of the combustion chamber (3) is measured on the side of the water chamber (4) using an additional temperature sensor (T4), the signal from which is supplied to the control unit (9) and processed, following which the value of the actual temperature Ta is compared against the limit temperature Tg, and when both values are equal, the control unit (9) generates an alarm signal off. Once the fired heat exchanger is off, the limescale accumulated on the sieve wall (5) of the combustion chamber (3) is removed in any known way. The fired heat exchanger is fitted with additional sensor of temperature (T4) fixed in the socket (12) on the sieve wall (5} of the combustion chamber (3) on the side of the water chamber (4), and connected, either via a wire or wirelessly, to the control unit (9).