Boiler Cleaning Nozzle with Converging Holes for Low-Evaporation Jets
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Solution Overview
Problem
Existing nozzles for cleaning open draft boiler surfaces in combustion or incineration plants face challenges in achieving effective cleaning while minimizing water consumption and evaporation, especially in high-temperature environments.
Innovation Solution
A nozzle design with an axial liquid flow direction and guiding holes inclined relative to the axial direction, converging into a central outlet, stabilizes the liquid jet for focused delivery, reducing evaporation and consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water is sprayed at high pressure to reach boiler surfaces, then cleaning effectiveness is improved, but water consumption increases and evaporation is worsened
Solution Approach 1:
The nozzle body is segmented into multiple guiding holes (e.g., 3-5 holes) that divide the water flow into separate streams. These segmented streams converge at the outlet to form a focused jet, combining the benefits of distributed flow control with concentrated delivery to reduce evaporation and water consumption while maintaining cleaning effectiveness.
Solution Approach 2:
The guiding holes are inclined at specific angles (e.g., 15-45 degrees) relative to the axial direction, introducing a radial component to the flow. This angular orientation in another dimension allows the water streams to converge naturally at the outlet, creating a focused jet without requiring high pressure, thereby reducing water consumption and evaporation.
2Area of stationary object
If water spray is dispersed to cover larger area, then cleaning coverage is improved, but water evaporation increases before reaching surfaces
Solution Approach 1:
The nozzle creates a dynamic flow pattern where water enters through inclined guiding holes and converges to form a focused jet. This dynamic convergence maintains a compact, concentrated spray pattern that reaches the boiler surface effectively without premature dispersion, reducing evaporation losses while maintaining adequate cleaning coverage.
3Ease of manufacture
If simple nozzle design is used, then manufacturing cost is reduced, but cleaning effectiveness at high temperature decreases
Solution Approach 1:
The nozzle uses a simple segmented structure with multiple guiding holes drilled into the nozzle body. This segmentation approach is easy to manufacture using conventional drilling and machining processes, while the geometric arrangement of the holes provides the functional complexity needed to create a focused jet that maintains cleaning effectiveness in high-temperature environments.
Solution Approach 2:
The nozzle geometry parameters (hole inclination angle, hole diameter, number of holes, convergence angle) are optimized to achieve focused jet formation. By carefully selecting these parameters, the nozzle maintains cleaning effectiveness at high temperatures while remaining simple to manufacture with standard engineering practices.
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 nozzle achieves a homogeneous liquid beam with reduced evaporation and lower water usage, effectively cleaning boiler surfaces at high temperatures while being cost-effective and suitable for retrofitting existing systems.
Implementation Method 1
the nozzle dispenses a liquid, such as water, with low pressure in a focused jet in a laminar flow
Implementation Method 2
the water spray does not spread out too early and thereby simply evaporates inside the boiler before reaching the boiler surfaces to be cleaned
Data Source
Figure 1
Figure 2~4
AI summary
The present invention concerns a nozzle for a rotating nozzle head in an apparatus for cleaning open draft boiler surfaces in a combustion or incineration plant by dispensing a liquid with low pressure, said nozzle having an axial liquid flow direction and comprises a nozzle body having a first body portion and a second body portion, wherein a plurality of guiding holes are provided in the first body portion which are adapted to guiding liquid towards a nozzle opening, wherein said guiding holes are provided with an inclination relative to the axial direction and converging into a central axial outlet tube through the second body portion to the nozzle opening where the liquid is dispensed.