吸附式干燥機(jī)和冷凍式干燥機(jī)是現(xiàn)在市場上應(yīng)用最廣泛的干燥機(jī)。

 

Adsorption dryer and freeze dryer are the most widely used dryers in the market.

 

吸附式干燥機(jī)主要通過干燥劑吸附特點(diǎn)來降低壓縮空氣中的水份，按吸附劑的再生方式來分類，主要分為無熱再生、微熱再生、鼓風(fēng)熱再生、壓縮熱再生4種。

 

Adsorptive dryer reduces moisture in compressed air mainly by adsorbing characteristics of desiccants. According to regeneration methods of adsorbents, it can be divided into four types: non-thermal regeneration, micro-thermal regeneration, blast thermal regeneration and compressed thermal regeneration.

 

優(yōu)聯(lián)超濾為大家介紹一下應(yīng)用最多的微熱再生吸附式干燥機(jī)的工作原理及其特點(diǎn)。

 

Ultrafiltration provides you with an introduction to the working principle and characteristics of the micro-thermal regenerative adsorption dryer, which is the most widely used.

 

工作原理：微熱再生吸附式干燥機(jī)是根據(jù)變壓吸附、再生循環(huán)的原理，利用自熱進(jìn)行吸附干燥。

 

Working Principle: The micro-heat regeneration adsorption dryer is based on the principle of pressure swing adsorption and regeneration cycle, using self-heating for adsorption drying.

 

壓縮空氣交替流經(jīng)兩個吸附塔，當(dāng)其中一個吸附塔在高分壓的狀態(tài)下，干燥劑（如硅膠、鋁膠、分子篩等）吸收大量的水分，而另一吸附塔則由再生氣管道通入干燥的低壓氣體，解析干燥劑吸收的水分進(jìn)行干燥劑的再生。

 

Compressed air flows through two adsorption towers alternately. When one of the adsorption towers is at high partial pressure, desiccants (such as silica gel, aluminium gel, molecular sieve, etc.) absorb a large amount of water, while the other adsorption tower passes through the regeneration gas pipeline to dry low-pressure gas, analysing the water absorbed by desiccants for desiccant regeneration.

 

它采用活性氧化鋁或者分子篩為吸附劑，利用變溫變壓吸附原理，常溫吸附時，空氣中水分子的分壓力大于吸附劑中水分子的分壓力，水分子進(jìn)入吸附劑內(nèi)部，在吸附劑的表面冷凝成水，放出冷凝熱，將此熱量蓄于吸附塔的上部。

 

It uses activated alumina or molecular sieve as adsorbent, and uses the principle of variable temperature and pressure adsorption. When adsorbing at room temperature, the partial pressure of water molecule in air is greater than that of water molecule in adsorbent. Water molecule enters the adsorbent, condenses into water on the surface of adsorbent, releases condensation heat, and stores this heat on the adsorbent tower. Department.

 

再生時，一定量的干燥空氣經(jīng)加熱器加熱至180℃左右通過再生筒，使吸附劑的吸附能力大大降低，使吸附劑中的水分子逸出，同時蓄于吸附塔內(nèi)的熱量有助于節(jié)約加熱器的功率。

 

During regeneration, a certain amount of dry air is heated by heater to 180 C through regeneration cylinder, which greatly reduces the adsorptive capacity of adsorbent, makes the water molecules in adsorbent escape, and at the same time, the heat stored in the adsorbent tower helps to save the power of the heater.

 

吸附劑經(jīng)過吸附、再生、吸附循環(huán)使用，對生產(chǎn)提供源源不斷的干燥壓縮空氣。

 

The adsorbent is adsorbed, regenerated and recycled to provide continuous dry compressed air for production.

 

工作流程：干燥機(jī)開機(jī)后，A塔吸附運(yùn)行，B塔再生。

 

Work flow: After the dryer starts, tower A is adsorbed and tower B is regenerated.

 

在預(yù)先設(shè)定的時序控制下，切換閥1-A打開、1-B關(guān)閉，排放閥6-B打開、6-A關(guān)閉，濕空氣進(jìn)入A塔，干燥后的空氣通過止回閥4-A排入下游管線；部分干燥壓縮空氣在壓差的作用下通過孔板5流入再生氣加熱器8，被加熱至設(shè)定溫度并進(jìn)入B塔內(nèi)解吸潮濕的吸附劑，使吸附劑再生。

 

Under the pre-set timing control, the switching valve 1-A opens and 1-B closes, the discharge valve 6-B opens and 6-A closes, and the wet air enters tower A. The dried air is discharged into the downstream pipeline through check valve 4-A. Under the action of pressure difference, part of the dry compressed air flows into regenerative gas heater 8 through orifice plate 5 and is heated to the set temperature. The wet adsorbent is desorbed in tower B to regenerate the adsorbent.

 

潮濕的再生空氣通過排放閥6-B和消聲器7排入大氣。這一再生階段稱為“加熱階段”。 加熱再生持續(xù)一段時間后，出口再生空氣溫度達(dá)到設(shè)定值，再生氣加熱器就停止加熱。未加熱的再生干燥空氣進(jìn)入B塔內(nèi)對吸附床層進(jìn)行冷卻，使其恢復(fù)至吸附時的溫度，這一階段稱為“冷吹階段”。

 

Moist regenerated air is discharged into the atmosphere through exhaust valve 6-B and muffler 7. This regeneration stage is called "heating stage". After heating regeneration for a period of time, the outlet regenerated air temperature reaches the set value, and the regenerated gas heater stops heating. Unheated regenerated dry air enters tower B to cool the adsorbent bed and restore it to the temperature at which it is adsorbed. This stage is called "cold blowing stage".

 

冷吹結(jié)束后，B塔進(jìn)行“均壓”，最后完成整個再生過程。微熱再生吸干機(jī)的控制系統(tǒng)比無熱再生干燥機(jī)復(fù)雜。除了控制相關(guān)閥門外，還需要根據(jù)再生溫度控制加熱器的運(yùn)行。一般均采用采用PLC和相關(guān)的溫控裝置實現(xiàn)控制。

 

After the cold blowing, the pressure of tower B was equalized, and the whole regeneration process was completed. The control system of micro-heat regenerative dryer is more complex than that of non-heat regenerative dryer. In addition to controlling the relevant valves, the operation of the heater also needs to be controlled according to the regeneration temperature. Generally, PLC and related temperature control devices are used to realize the control.

 

 

 

以上是常見的雙塔干燥機(jī)的工作原理，目前吸附式干燥機(jī)已經(jīng)發(fā)展至模塊干燥機(jī)和模芯干燥機(jī)，通過結(jié)構(gòu)優(yōu)化，使干燥效果和再生氣耗得到了大幅度優(yōu)化。

 

Above is the working principle of common two-tower dryer. At present, adsorption dryer has been developed to modular dryer and core dryer. Through structural optimization, the drying effect and regeneration gas consumption have been greatly optimized.