Ultra quiet foldable secondary combustion pit

Story Scene: Whisper Flames of the Canyon

Location: A semi desertified canyon bottom campsite on the edge of Zion National Park, Utah, USA (non designated campsite, but campfires allowed). Surrounded by huge red sandstone cliffs, the ground is covered with gravel and sand, and a seasonal stream with a dry riverbed is not far away.

Character:

Sophia: The protagonist is an experienced backpacker and outdoor photographer who pursues lightweight, efficient, and low impact camping (Leave No Trace). She is familiar with regulations and values environmental protection. Personality independent, pragmatic, and attention to detail.

Jack: Sofia's camping partner, a physically strong but relatively inexperienced friend who enjoys the traditional campfire atmosphere but is sensitive to smoke. Passionate personality, a bit casual.

(Optional) Park Ranger: A passing park ranger conducting routine bonfire safety checks.

Time: Late autumn evening, with a sudden drop in temperature. The sky quickly darkened in the canyon, and a cold wind blew through the valley floor, bringing a piercing chill. The air is very dry.

Scene unfolding:

The last rays of the sunset dyed the sandstone cliffs of Zion Canyon a fiery golden red, then quickly faded away, leaving behind a deep indigo shadow. The dry and cold air seemed to freeze, as Sofia and Jack had just hiked to this secluded valley camping site. The cold wind crawled through his collar like a cold snake, and Jack rubbed his hands, his teeth trembling. "Oh my god, I didn't expect it to be so cold at the bottom of the canyon! I can't do without a decent bonfire tonight, I'll freeze to death." He looked around and saw Sofia pulling out a flat, compact stainless steel cylindrical object (pit base) from the side pocket of her backpack, as well as several nested ring components (ventilation ring, combustion chamber, top ring).

Don't worry, Jack, we have a 'Whisperer', "Sofia said confidently, beginning to operate on a cleared gravel ground.

Jack looked at Sofia's movements with a hint of doubt: "This thing? It looks much smaller than the big iron bucket we used last time by the lake. Can it keep warm?" Sofia didn't look up, her hand moved smoothly: "Watch it, five piece set, 30 seconds

① Stabilize and level the stainless steel base.

② The internal combustion chamber with air inlet on the first layer of the card.

③ Accurately embed an outer combustion chamber with more ventilation holes on the second layer (a key structure for secondary combustion).

④ Put on a sturdy top ring (flame nozzle).

⑤ Finally, easily place the adjustable grill on the top ring.

The whole process went smoothly, and in less than 30 seconds, a intricately structured fire pit emitting a cold metallic luster was assembled. All components are tightly fitted and stable. Look, this is the power of design, "Sofia clapped her hands." Save space, save time, save energy

Jack picked up some dead wood nearby, including a rather thick and nearly 40 centimeter long dried spruce branch. He habitually wanted to find an axe to split it open. No need, "Sofia stopped him and gestured for him to directly place the entire wooden branch horizontally into the fire pit." The caliber of the Whisperer is designed for this kind of big guy, "Jack half believed and half doubted as he stuffed the wooden branch inside. It was indeed easy to insert, and the wooden branch was firmly placed in the middle of the combustion chamber.

Sofia used a spark to ignite at the bottom. The flames quickly engulfed the small branches and began to lick the thick juniper wood branch. Soon, a magical scene appeared: not only did the bottom burn vigorously, but at the ventilation opening at the top of the fire pit, a clear, stable, and almost transparent golden flame gushed out like a ring of fire! This is a typical sign of secondary combustion - the combustible gas produced in the first combustion is forcibly sucked up to the top, fully mixed with the air entering the top vent, and then burned again. This' fire ring 'is not only spectacular, but also brings astonishing heat radiation.

Jack's biggest surprise was, "Hey! Where's the smoke? There's not much smoke on such a big piece of wood?" Indeed, despite the intense burning of the wood, the smoke produced was unusually rare and almost negligible. Only a trace of almost transparent heat dissipated rapidly in the cold air. The air is filled with the unique fragrance of burning juniper wood, rather than the pungent smell of smoke. Sofia explained, "Secondary combustion burns off most of the unburned gas, with high efficiency and low pollution. At the edge of this dry national park, low smoke is too important, both safe and environmentally friendly

Just as the two were enjoying the warm, bright, and almost smoke-free bonfire, a flashlight shone from far to near. It's the park patrol. Good evening, bonfire safety check... "The police officer paused when he saw the fire pit. He carefully inspected the location of the fire pit (away from vegetation and flammable materials), controlled the fire (although the flames were strong, they were firmly restrained inside the pit by a stainless steel structure), and then focused on observing smoke emissions. He showed a surprised and approving expression on his face: 'Wow, is this design... secondary combustion?'? I rarely see such an efficient and low smoke pit among backpackers. This structure... is really exquisite and easy to assemble. ”He used his flashlight to shine on the clear golden secondary combustion flame ring at the top and said, "Great, it meets all the regulations. Enjoy it and be careful to completely extinguish the flame

After the police officer left, Jack was completely convinced. He sat comfortably on the folding chair, stretching his frozen hands and feet towards the high-efficiency radiating heat source. The huge pine branches were steadily burning in the fire pit, and the flame ring at the top jumped, casting warm light onto the towering red rock walls around, forming flickering shadows. Without the interference of smoke, the starlight appears particularly bright and clear in the deep canyon night sky. The crackling sound of the campfire was amplified in the quiet canyon, like the deep pulse of the earth.

Sofia adjusted her camera to capture the moment when the flames danced with the rock wall. She looked at the efficiently burning "Whisperer" in front of her, and the flames reflected on her face: "This is the real bonfire, Jack. It's full of heat and atmosphere, but it's particularly gentle towards this fragile land. A bonfire without smoke can let us see the real starry sky and listen to the" whispers "of the valley." The stainless steel fire pit still maintains its strength and calmness in the flames, like a reliable energy core, perfectly separating the harsh wilderness from the joy of camping.