煙氣中的CO?提取設(shè)備

  這種CO2回收設(shè)備是以排放的煙氣為氣源。

  煙氣在清洗塔內(nèi)通過循環(huán)堿液去除SO2，同時(shí)冷卻后，煙氣風(fēng)機(jī)將煙氣從清洗塔輸送到吸收塔，在吸收塔內(nèi)煙氣中的CO2被30%MEA堿液和抗氧化劑吸收，在吸收塔頂部的一個(gè)清洗單元去除滯留MEA，然后送回吸收塔，殘余氣體排放到大氣中。

  CO2富液MEA堿液在進(jìn)入解析塔前，通過貧/富液交換器預(yù)熱，經(jīng)過再沸器進(jìn)一步加熱釋放CO2。MEA蒸汽、蒸汽和CO2脫離再沸器流向解析塔，在解析塔內(nèi)上升，進(jìn)入解析塔頂部水洗單元，去除殘余MEA汽。

  蒸汽和CO2離開解析塔進(jìn)入回流冷凝器，冷卻后進(jìn)入回流桶，分離CO2，冷凝液回流到解析塔，被解析的MEA從解析塔底部經(jīng)過再沸器通過貧/富熱交換器和冷卻器返回到吸收塔。冷卻后的MEA堿液通過一個(gè)旁通活性炭過濾器去除有機(jī)物成分，其它存在于MEA堿液中污染物比如熱穩(wěn)定鹽和其它關(guān)聯(lián)成分通過再沸器內(nèi)部回收程序定期去除。

  從分離桶分離出來CO2通過氣體冷卻器冷卻和冷凝水通過疏水器去除，CO2氣體在經(jīng)過二級(jí)壓縮16bar前，通過高錳酸鉀清洗塔進(jìn)一步清潔。

  將壓縮后的CO2氣體在干燥器內(nèi)干燥到露點(diǎn)-60℃，干燥器通過從CO2冷凝器來的惰性氣體也就是相當(dāng)于不凝結(jié)氣體沖凈系統(tǒng)通過電加熱自動(dòng)再生。
  然后CO2氣體通過活性炭去除異味。

  被凈化的和干燥的CO2氣體通過列管換熱器在溫度-30 ℃下進(jìn)行液化。同時(shí)配套氨冷或氟壓縮機(jī)組。保持CO2冷凝器正確的操作壓力。

  液態(tài)深冷CO2被送到CO2儲(chǔ)罐。

The plant is based on CO2 recovery from an external flue gas source.

The flue gas is cooled in a flue gas scrubber where a soda-lye is recirculated in order to wash out sulphur dioxide. An exhauster leads the flue gas from the flue gas scrubber to the absorber. In the absorber the CO2 in the flue gas is absor-bed in a 30% MEA lye and inhibitor solution. A washing section in the top of the absorber removes retained MEA, which is then returned to the absorber. The gas residue is exhausted to the atmosphere.

The CO2 rich MEA lye is preheated in the rich/lean lye heat exchanger, before being pumped to the stripper, where further heating in the reboiler releases the entrapped CO2. MEA vapour, steam and CO2 leaving the reboiler flows upwards in the stripper and enters a washing section in the top of the stripper where retained MEA vapour is removed.

Steam and CO2 leaves the stripper and enters the reflux condenser where they are cooled before entering the reflux drum. In the reflux drum CO2 is separated from the condensate. Condensate is lead back to the stripper. The stripped MEA lye from the reboiler is led from the stripper bottom through the rich/lean lye heat exchanger and the MEA lye cooler back to the absorber. A side-stream carbon filter removes organic compounds from the cold MEA lye. Other contaminants in the MEA lye such as heat stable salts and other chain compounds are periodically removed by boiling ina reclaimer.

The CO2 gas from the reflux drum is cooled in a gas cooler and condensate is removed in a water trap. The CO2 gas is further cleaned in a potassium permanganate scrubber before being compressed to 16 bar by means of a two stage compressor.

To allow condensation the CO2 gas is dried in a dehydrator to a dew point of abt. -60℃.The dehydrator is electrically heated and automatically regenerated by inert gas from the CO2 condenser and thereby acts as a purging system for non-condensable gases.
The CO2 is then passed through a carbon filter for removal of odours.

The purified and dried gas is condensed in a multi-tube heat exchanger at a temperature of about -30℃.The matching refrigeration plant is equipped with an ammonia or freon compressor. The refrigeration plant maintains the correct operating pressure in the CO2 condenser.

The liquid deep-cooled CO2 is led to an insulated storage tank.

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