Intro

"苦節君kujiejun" (other spellings koojiejun/kojiejun) this is a type of bamboo stove

Bamboo stove

The original bamboo stove was made in China in the late 14th century. A monk named Xing Hai in the Ting Song temple on Mount Hui in Wuxi asked a travelling bamboo artisan to make him a stove on which he could boil water for tea. Surprisingly, it included bamboo to form the frame of the stove. The...

 and is also a special term for "chazao茶灶" tea stove.
Popular during Song Dynasty

Song Dynasty

The Song Dynasty was a ruling dynasty in China between 960 and 1279; it succeeded the Five Dynasties and Ten Kingdoms Period, and was followed by the Yuan Dynasty. It was the first government in world history to issue banknotes or paper money, and the first Chinese government to establish a...

 the bamboo windscreen stove frame would fit on top of a brazier

Brazier

A brazier is a container for fire, generally taking the form of an upright standing or hanging metal bowl or box. Used for holding burning coal as well as fires, a brazier allows for a source of light, heat, or cooking...

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Tea Ware

This is special name for a windscreen stove. This type of stove was also used during the Tang dynasty

Tang Dynasty

The Tang Dynasty was an imperial dynasty of China preceded by the Sui Dynasty and followed by the Five Dynasties and Ten Kingdoms Period. It was founded by the Li family, who seized power during the decline and collapse of the Sui Empire...

when tea was boiled.

Reference

• Tea Terms 2010 中英文茶術語