Two-Part Block Nozzle for Fluidized Bed Boilers
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Solution Overview
Problem
Existing block nozzles in fluidized bed boilers face challenges due to high temperatures and abrasive conditions, leading to wear and difficulty in replacement, especially when embedded in refractory material.
Innovation Solution
A two-piece block nozzle design with a ductile iron base section and a stainless steel or chrome-nickel alloy nozzle section, where the nozzle section can be easily detached and replaced, featuring a ceramic coating for high-temperature resistance and a mating engagement assembly to reduce air leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If nozzles are embedded in refractory material to protect against high temperature, then temperature resistance is improved, but nozzle replacement becomes difficult
Solution Approach 1:
The nozzle is divided into two separate sections: a base section that remains embedded in the refractory material and provides thermal protection, and a detachable nozzle section that can be easily removed and replaced. The engagement assembly with mating features allows the nozzle section to be securely attached yet easily detached without disturbing the refractory material or base section.
2Reliability
If nozzles are made from materials resistant to high temperature and abrasion, then service life is improved, but manufacturing complexity increases
Solution Approach 1:
Different sections of the nozzle are made from different materials optimized for their specific functions: the base section is made from ductile iron suitable for embedding in refractory material, while the nozzle section is made from stainless steel or chrome-nickel alloy with ceramic coating to resist high temperature and abrasion in the combustion zone. This allows each part to be manufactured using appropriate processes for its material.
3Ease of repair
If engagement assembly features are added to enable detachable connection, then ease of replacement is improved, but device complexity increases
Solution Approach 1:
The engagement assembly features are integrated directly into the nozzle and base section structures themselves rather than being separate components. The mating features with engagement protrusions and recesses are formed as part of the nozzle sections, eliminating the need for additional fasteners or complex locking mechanisms while still providing secure detachable connection.
Data Source
AI summary
A two-piece block nozzle is disclosed. In some embodiments, the two-piece nozzle may include a nozzle section and a base section. The nozzle section may be detachably engaged to the base section. The nozzle section may be formed with a temperature resistant material such as, for example, a chrome-nickel alloy or a stainless steel alloy. The base section may be formed with a relatively lower cost material such as, for example, a ductile iron material.