Explosive Cleaning Device for Boiler Deposit Removal
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Solution Overview
Problem
Conventional cleaning methods for incineration boilers are inefficient and costly, requiring extensive downtime and safety concerns due to the need for explosives, and suffer from slow filling of gaseous components in explosive gas mixtures used for cleaning, leading to prolonged operational interruptions and potential damage.
Innovation Solution
A cleaning device and method that utilizes a control system to optimize the introduction of gaseous components into a pressure container, allowing for rapid and precise filling of a container envelope with a stoichiometric gas mixture, using pressure sensors and metering fittings to control the introduction based on differential pressure, and igniting the mixture for efficient cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cleaning methods (boiler beating, steam jet blasters, water jet blasters, shot-cleaning, sand blasting) are used, then cleaning can be performed on shut-down installations, but operational interruption of several days or weeks occurs and cleaning personnel are exposed to dust and dirt
Solution Approach 1:
The patent replaces conventional mechanical cleaning methods (boiler beating, water jet blasters, shot-cleaning, sand blasting) with an explosive cleaning system that uses detonation waves to remove deposits. The explosive charge creates shock waves that mechanically detach fouling from heat surfaces, eliminating the need for prolonged operational shutdowns and manual cleaning operations.
Solution Approach 2:
The patent changes the physical state and energy parameters of the cleaning process by using explosive detonation instead of gradual mechanical removal. The explosive transition from stable to high-energy state creates instantaneous cleaning action, reducing operational interruption from days/weeks to minutes while maintaining effective deposit removal.
2Productivity
If explosive bodies are introduced and ignited for cleaning, then cleaning time is significantly shortened, but high costs for explosive material and huge expenses with regard to safety arise
Solution Approach 1:
The patent employs disposable explosive charges that are consumed in the cleaning process. These are replaced with inexpensive, readily available materials rather than expensive specialized explosives, reducing both material costs and safety handling requirements while maintaining the high-speed cleaning capability.
Solution Approach 2:
The patent introduces an intermediary substance or system between the explosive charge and the cleaning target that reduces safety risks. This intermediary allows the explosive energy to be contained and controlled during storage and handling, eliminating the need for special permits and qualification while enabling rapid cleaning operation.
3Reliability
If gaseous components are introduced out of pressure containers via metering fittings, then the explosive gas mixture is produced, but the filling procedure is comparatively slow due to asymptotic exit speed approach to zero
Solution Approach 1:
The patent dynamically adjusts the metering fitting operation to maintain optimal flow velocity throughout the filling process. By controlling the pressure differential and opening/closing timing of metering fittings, the system prevents the asymptotic slowdown effect and maintains high filling speed while ensuring accurate stoichiometric mixing of gaseous components.
Solution Approach 2:
The patent performs preliminary preparation of gaseous components in pressure containers before introduction into the cleaning system. Gases are pre-mixed or pre-positioned in controlled quantities, allowing rapid introduction without the need for slow metering during the actual cleaning operation, thus improving filling speed while maintaining stoichiometric accuracy.
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 solution enables faster and safer cleaning by reducing the time required for filling the container envelope, minimizing exposure to heat, and allowing for the use of less expensive and safer gaseous components, thereby reducing operational downtime and costs while maintaining effective removal of fouling deposits.
Implementation Method 1
An explosion is produced by way of igniting the gas mixture in the container envelope, and the shock waves of this explosion lead to the detachment of fouling on the boiler walls
Implementation Method 2
the shock waves of this explosion lead to the detachment of fouling on the boiler walls
Implementation Method 3
The container envelope is inflated with an explosive gas mixture
Data Source
AI summary
A method and cleaning device for removing deposits from interiors of receptacles and installations by way of explosion technology. The cleaning device includes a cleaning apparatus with a receiving space, and at least one pressure container that is connected via at least one metering fitting to the cleaning apparatus. The controlled introduction of the at least one gaseous component into the cleaning apparatus is effected according to the principle of the differential pressure between a maximal pressure at the beginning of the introduction and a nominal residual pressure after completion of the introduction. For this, based on a maximal pressure, the nominal residual pressure in the pressure container is ascertained on the basis of the quantity of gaseous component to be introduced, and the introduction of the at least one gaseous component is stopped on reaching the nominal residual pressure, which thereby lies in the overpressure range.