Definition of heat exchanger<€∞ 

　　A heat exchanger is a device that transfe☆‌≈™rs some of the heat from a hoα‍•λt fluid to a cold fluid, i.e., a large closed veα>♠ssel filled with water or ot≠αher media, while having pipes running through itα÷±→. The hot water is allowed to flow thro₩¶>ugh the pipe.

　　Due to the temperature difference between the h¥≤∑ot water in the pipe and the hot a∞™♥λnd cold water in the container, a heat exch✔'ange will be formed, that is, tΩβhe physical heat balance of the junior high schoo≥σl, the heat of the hiφ'gh temperature object is always tra≤‌™nsferred to the low temp♥'erature object, so that the he£π↑at of the water in the pipe is exchanged to the ♦'☆cold water in the container∞ ™, the heat exchanger is also known a>↑÷s a heat exchanger.

　　Heat exchanger classificatiγ₽on and structure

　　Heat exchangers can be classified by use as.↔↔↑

　　Cooler, condenser, hea♦>β≈ter, heat exchanger, reboiler, steam generator,§♠φ waste heat (or waste heat) boiler.

　　According to the heat exch≥♣₽ange method can be divided into↕©±≤.

　　Direct contact heat↑₹ exchanger (also called hybrid he♥$at exchanger), heat storage heat™↓ exchanger and inter-wall heat excha₩"nger.

　　The following is a description of the ≤δ€heat exchanger class✘ ified according to the heat transf★♥er mode.

　　1) Direct contact heat exchanger

　　Direct contact exchanger is d♦≈Ωependent on direct contact between ©♣≤∞cold and hot fluids and heat transfer, this heat ✔₽ transfer method to avoid heat transfer between th•₽☆♦e wall and its two sides of the dirt heat ÷≈  resistance, as long as the contact b₩±δ₽etween the fluid is good, t ★here is a large heat tranλ₽∞ sfer rate.

　　Therefore, whereve&σ​ r fluids are allowed to mi™λ₩εx with each other, mixed hea₩<t exchangers can be used, such as gas w ®™ashing and cooling, cooling→£ of circulating water, mixed heating between stea≤ m and water, steam condensation, etc..±≠♠ It is applied throughout ≠₽$≤the chemical and metallur→↑Ωgical enterprises, power eng↑λ♣™ineering, air conditioning engineering and many§↓ε other production sectors.

　　Commonly used mixed heat exch‍¶αanger are: cooling tower, gas scrubber‍♣‌ tower, jet heat exchanger and↑≥ mixed condenser.

　　2) Heat storage heat ex★≈→₩changer

　　Accumulator heat exc±βhanger is used to carry out←©¥ heat storage type heat exch'©♥ange equipment. Soli≈&™d filler is installed inside t♥∏∑¶o store heat.

　　Generally with refractory bricks and other f↓ ¶¶ire lattice (sometimes with ¥ βmetal waveform belt, etc.).

　　Heat exchange is carried out ↔✔in two stages.

　　In the first stage, ∑×‍the hot gas passes throug₽≠≈h the fire lattice, a®≠✔∑nd the heat is transferred to the fire lattic★×®e and stored up.

　　In the second stage, the c×→π↑old gas passes through the fire lat™↕<tice and receives the♠∏♣ heat stored in the fire lattice and i$π↔s heated.

　　These two stages alternat δΩ₽e. Usually two heat accumulators areδ±σ used alternately, i.e., when the hot gas entersλ&↓ one vessel, the cold gas ente★φ₹¥rs the other. Commonly used in the metallurgi♣☆cal industry, such as the heat storage chamber of&£™$ steelmaking flat furnaces.

　　Also used in the chemical industry, ↔₹"such as gas furnaces in the air preheater o®γr combustion chamber, artificial oil plants in t ∑←he thermal storage cracking furnace.

　　3) Inter-wall heat exchanger

　　This type of heat exchanger, hot and cold betw→★een the two fluids separated by a metal, so ★♠that the two fluids do n♠×↓£ot mix and heat transfer.

　　In chemical production, hot≈β​ and cold fluids often can not‌☆ be in direct contact, so the wall heat exch↑₽ ✔anger is commonly used as a hea•☆t exchanger.