CN101502740B - Method for extracting concentrated methane from mash gas with middle concentration of methane by pressure varying adsorption technology - Google Patents

Method for extracting concentrated methane from mash gas with middle concentration of methane by pressure varying adsorption technology Download PDF

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CN101502740B
CN101502740B CN 200910058352 CN200910058352A CN101502740B CN 101502740 B CN101502740 B CN 101502740B CN 200910058352 CN200910058352 CN 200910058352 CN 200910058352 A CN200910058352 A CN 200910058352A CN 101502740 B CN101502740 B CN 101502740B
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methane
pressure
extracting
concentrated
technology
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CN 200910058352
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CN101502740A (en )
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杨皓
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杨皓
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Abstract

本发明公布了一种低浓度甲烷气体提浓的方法,使用串联吸附工艺。 The present invention discloses a low concentration of methane gas concentrate, a method using series adsorption process. 一种含甲烷成分浓度4~25%的混合气称为原料气,其甲烷浓度提高到至少30%最高100%的方法,其特征在于,使用变压吸附气体分离工艺,并且经过以下的步骤:(1)原料气压力0.02~0.4MPa;使用多级变压吸附工艺提浓甲烷:第一级,吸附出口气体甲烷浓度降低到原料气甲烷浓度的20~70%;第二级,吸附出口气体甲烷浓度降低到1%以下;(2)使用第一级的抽空气体作为第三级原料气体,由此提高第三级抽空气体中的甲烷浓度达到至少30%最高100%;(3)将第二级的抽空气体作为第一级的原料气;(4)第三级吸附出口气体作为第一级的原料气。 4 to 25% of the mixed gas containing methane feed gas concentration is called, a method to improve the methane concentration of at least 30% up to 100%, wherein the pressure swing adsorption gas separation process, and through the following steps: (1) a feed gas pressure 0.02 ~ 0.4MPa; pressure swing adsorption process using a multi-stage concentrate methane: a first stage, the outlet gas adsorbed methane concentration is reduced to 20 to 70% of the feed gas methane concentration; the second stage, the outlet gas adsorption methane concentration decreased to less than 1%; (2) using the first evacuation stage gas source gas as the third stage, thereby increasing the concentration of methane in the third stage of the gas evacuated at least 30% up to 100%; (3) the first two evacuated gas as raw material gas of the first stage; (4) a gas outlet of the third stage as a first stage adsorption feed gas. 瓦斯气、炉窑气、焦炉气、裂解气放空气、其它放空气采用该方法分离甲烷可以降低成本。 Methane gas, furnace gas, coke oven gas, cracked gas discharge air, the other discharge air using methane separation method can reduce the cost.

Description

一种中甲烷浓度瓦斯变压吸附提浓甲烷的方法 One kind of concentration of methane gas pressure swing adsorption method concentrate methane

一、技术领域 First, the technical field

[0001] 本发明涉及气体分离领域,是一种使用变压吸附技术分离气体混合物中部分组分的方法。 [0001] The present invention relates to the field of gas separation, a method of separating a gas mixture by pressure swing adsorption part of the components used.

二、背景技术 Second, the technical background

[0002] 对于瓦斯气回收甲烷组分的技术,惯常使用的方法为深冷回收。 [0002] For the technology of gas components methane gas recovery, methods conventionally used for cryogenic recovery. 由于需要庞大的设备和较多的操作能耗,因此,工业推广由于经济原因比较困难。 Due to the huge need for energy equipment operation and more, therefore, industry promotion for economic reasons more difficult.

[0003] 使用低浓度气体作为化工原料,一般由于有效成分分压低,反应推动力小,不利于设备利用率的提高,因此,必须通过提高气体浓度或提高气体压力来实现有效成分分压提高。 [0003] The low concentration gas as a chemical feedstock, since the active ingredient is generally partial pressure, the reaction driving force is small, is not conducive to the utilization device, therefore, an active ingredient must be achieved increased by increasing the partial pressure or increasing the gas pressure in the gas concentration. 低浓度气体压缩,势必消耗大量的无用功,因此,提高气体浓度,成为一个有效的途径。 Low concentrations of gas compression, is bound to consume a large amount of wasted effort, therefore, to improve the gas concentration, become an effective way.

[0004] 变压吸附技术用于提浓甲烷技术在很多的使用环境都有应用,但是,由于在实际应用中,由于瓦斯分离过程产生5-25%的爆炸极限气体,因此,少有工业应用研究。 [0004] The pressure swing adsorption technology to concentrate methane in the environment of use have many applications, however, since in practical applications, since the gas separation process of generating a gas explosion limits of 5-25%, and therefore, few industrial applications the study.

三、发明内容 III. SUMMARY OF THE INVENTION

[0005] 为了提高甲烷浓度,本发明利用多级串联吸附的策略,用来提高气体回收率,同时避免爆炸气体直接压缩产生的危险。 [0005] In order to increase the concentration of methane, the present invention utilizes a multi-stage series sorption strategy, used to improve the gas recovery while avoiding dangerous explosive gas generated direct compression.

[0006] 为了减少能耗,可以使用较低的吸附压力。 [0006] In order to reduce power consumption, you can use a lower adsorption pressure. 在使用变压吸附方法回收低浓度有效气体之前,必须保证原料气压力0.02〜0.4MPa (表),经过预处理,除去高沸点组分。 Prior to recovery using a low concentration of the active gas pressure swing adsorption process, it must ensure that the feed gas pressure 0.02~0.4MPa (table), pre-treated, high-boiling components are removed.

[0007] 将含甲烷26-80%瓦斯气在较低的压力0.02〜0.4MPa下送入吸附塔,在第一级吸附塔中,甲烷被吸附剂吸附,而比原料气甲烷浓度较低的第一级吸附流出气直接送入第二级吸附塔;在第二级吸附塔中,甲烷被吸附剂吸附,抽空气可以作为第一级原料气,而第二级吸附流出气浓度低于1%,直接送入废气系统;第一级抽空气体作为第三级吸附塔原料气体,甲烷被吸附剂吸附,抽空气体浓度直接提高到至少95%最多100%作为成品气输出,吸附流出气可以用作第一级原料气; [0007] The methane-containing 26-80% methane gas was fed into the adsorption column at a lower pressure 0.02~0.4MPa, the adsorption tower in the first stage, methane is adsorbed by the adsorbent, while lower than the concentration of methane in the feed gas the first stage adsorption effluent gas directly into the adsorption tower of the second stage; the second stage in adsorption tower, the methane is adsorbed by the adsorbent, the air pump can be used as raw material gas of the first stage and the second stage adsorption effluent gas concentration is less than 1 %, directly into the exhaust system; the first stage of evacuating gas as raw material gas adsorption tower of the third stage, the methane is adsorbed by the adsorbent, the gas concentration is increased directly evacuated to at least 95% up to 100% is output as the product gas, the adsorption effluent gas may be used as a first feed gas stage;

[0008] 利用抽空解吸吸附塔。 [0008] The adsorber is evacuated using desorption.

[0009] 可以使用本级或者下一级抽空解吸气回流置换吸附塔死空间的非甲烷气体,由此提高吸附塔抽空解吸气中甲烷浓度。 [0009] This stage may be used or a solution of the intake evacuated non-methane gas reflux replacement adsorption column dead space, thereby improving the adsorption tower evacuated desorbed methane concentration.

[0010] 这样,第三级的抽空气体甲烷浓度可以达到95〜100%。 [0010] Thus, the third stage is evacuated gas methane concentration can reach 95~100%.

[0011] 本发明所称的变压吸附工艺,可以是2〜12个吸附塔组成每一级。 A pressure swing adsorption process of the invention referred to [0011] This may be 2~12 adsorption towers each stage.

四、具体实施方式 IV DETAILED DESCRIPTION

[0012] 实施例1:某瓦斯气甲烷浓度30%,需要提高甲烷浓度到95%以上。 [0012] Example 1: a methane concentration of 30% methane gas, it is necessary to increase the methane concentration of 95% or more.

[0013] (I)经过压缩到压力为0.12MPa(表),经过预净化,除去原料气中的比甲烷沸点低的成分;(2)第一级进口原料气甲烷浓度30%,第一级吸附塔流出气甲烷浓度15%,第一级抽空气甲烷浓度77%;第二级进口原料气为第一级吸附塔流出气,甲烷浓度15%,第二级吸附塔流出气甲烷浓度0.2%,第二级抽空气甲烷浓度40%返回第一级作为原料气;第三级进口原料气为第一级吸附塔抽空气,甲烷浓度77%,第三级吸附塔流出气甲烷浓度28%返回第一级作为原料气,第三级抽空气甲烷浓度96%作为产品气输出。 [0013] (I) compressed to a pressure of 0.12MPa (table), pre-purification, is lower than the boiling point of methane in the feed gas components are removed; (2) a first stage inlet feed gas methane concentration of 30%, a first stage adsorber effluent gas methane concentration of 15%, the first stage draw air methane concentration of 77%; raw material gas inlet of the second stage to the first stage adsorber effluent gas, methane concentration of 15%, the methane concentration of the second-stage adsorber effluent gas 0.2% The second stage draw air methane concentration of 40% as the raw material gas returned to the first stage; the raw material gas inlet of the third stage is a first stage adsorption column suction air, the methane concentration of 77%, the third stage adsorber effluent gas return methane concentration of 28% as the raw material gas of the first stage, the third stage pumping air methane concentration of 96% as a product gas output.

[0014] 每级都采用3个吸附塔。 [0014] Each level uses three adsorption towers.

[0015] 实施例2:某瓦斯气甲烷浓度60%,需要提高甲烷浓度到99%以上。 [0015] Example 2: a methane gas concentration of 60% methane, the methane concentration necessary to increase more than 99%.

[0016] (I)经过压缩到压力为0.2MPa(表),经过预净化,除去原料气中的比甲烷沸点低的成分;(2)第一级进口原料气甲烷浓度60%,第一级吸附塔流出气甲烷浓度22%,第一级抽空气甲烷浓度88%;第二级进口原料气为第一级吸附塔流出气,甲烷浓度22%,第二级吸附塔流出气甲烷浓度0.9%,第二级抽空气甲烷浓度54%返回第一级作为原料气;第三级进口原料气为第一级吸附塔抽空气,甲烷浓度88 %,第三级吸附塔流出气甲烷浓度67 %,第三级抽空气甲烷浓度99%作为产品气输出。 [0016] (I) is compressed to a pressure of 0.2MPa (table), pre-purification, is lower than the boiling point of methane in the feed gas components are removed; (2) a feed gas inlet of the first stage the methane concentration of 60%, a first stage adsorber effluent gas methane concentration of 22%, the first stage draw air methane concentration of 88%; raw material gas inlet of the second stage to the first stage adsorber effluent gas, methane concentration of 22%, the methane concentration of the second-stage adsorber effluent gas 0.9% The second stage draw air methane concentration of 54% as the raw material gas returned to the first stage; the raw material gas inlet of the third stage is a first stage adsorption column suction air, the methane concentration of 88%, the methane concentration in the effluent gas adsorption tower of the third stage 67%, tertiary air extraction 99% concentration of methane gas output.

[0017] 每级都采用4个吸附塔。 [0017] Each stage four adsorption columns are used.

[0018] 实施例3:某瓦斯气甲烷浓度40%,需要提高浓度到99%以上。 [0018] Example 3: methane, a methane gas concentration of 40%, it is necessary to increase the concentration to 99%.

[0019] (I)经过压缩到压力为0.4MPa(表),经过预净化,除去原料气中的比甲烷沸点低的成分;(2)第一级进口原料气甲烷浓度40 %,第一级吸附塔流出气甲烷浓度4%,第一级抽空气甲烷浓度76% ;第二级进口原料气为第一级吸附塔流出气,甲烷浓度4%,第二级吸附塔流出气甲烷浓度0.1%,第二级抽空气甲烷浓度33%返回第一级作为原料气;第三级进口原料气为第一级吸附塔抽空气,甲烷浓度76%,第三级吸附塔流出气甲烷浓度43%,第三级抽空气甲烷浓度99%作为产品气输出。 [0019] (I) is compressed to a pressure of 0.4MPa (table), pre-purification, is lower than the boiling point of methane in the feed gas components are removed; (2) a feed gas inlet of the first stage the methane concentration of 40%, a first stage adsorber effluent gas of methane concentration of 4%, the first stage draw air methane concentration of 76%; raw material gas inlet of the second stage to the first stage adsorber effluent gas, methane concentration of 4%, the methane concentration in the second stage adsorber effluent gas 0.1% The second stage draw air methane concentration of 33% as the raw material gas returned to the first stage; the raw material gas inlet of the third stage is a first stage adsorption column suction air, the methane concentration of 76%, the third stage adsorber effluent gas of methane concentration of 43%, tertiary air extraction 99% concentration of methane gas output.

[0020] 每级都采用4个吸附塔。 [0020] Each stage four adsorption columns are used.

[0021] 本专利经过实际使用在瓦斯气回收甲烷,效果十分明显,有效降低了气体回收过程中的能耗,节约了成本。 [0021] After the actual use of the present patent the recovery of methane in the methane gas, the effect is very significant, effectively reducing the energy consumption during the gas recovery cost savings.

Claims (1)

  1. 1.一种变压吸附提浓甲烷的工艺,其特征在于,以含甲烷成分浓度26〜85%的瓦斯气、炉窑气、焦炉气、裂解放空气作为原料气,使用变压吸附气体分离技术,把甲烷浓度提高到至少95%最高100%的方法,其包含以下步骤:(I)原料气压力0.02〜0.4MPa,使用多级变压吸附工艺提浓甲烷:第一级,吸附出口气体甲烷浓度降低到原料气甲烷浓度的20〜70% ;第二级,吸附出口气体甲烷浓度降低到1%以下;(2)使用第一级的抽空气体作为第三级原料气,由此提高第三级抽空气体中的甲烷浓度达到至少95%最高100% ; (3)将第二级的抽空气体作为第一级的原料气;(4)第三级吸附出口气体作为第一级的原料气。 A pressure swing adsorption process mentioned concentration of methane, wherein the methane containing 26~85% concentration of methane gas, the adsorbed gas furnace gas, coke oven gas, cracked gas liberation of air as a raw material, using a pressure swing separation techniques, the methods to improve the methane concentration of at least 95% up to 100%, comprising the steps of: (the I) the feed gas pressure 0.02~0.4MPa, a multi-stage pressure swing adsorption process concentrate methane: a first stage, the adsorption outlet reduced to 20~70% of gas methane concentration feed gas methane concentration; a second stage, the outlet gas adsorbed methane concentration is reduced to less than 1%; (2) using the first evacuation stage of the third stage gas as the raw material gas, thereby improving methane gas concentration of the third stage is evacuated to at least 95% up to 100%; (3) the second stage gas is evacuated as the first stage feed gas; (4) a gas outlet of the third stage as a first adsorption stage feed gas.
CN 200910058352 2009-02-17 2009-02-17 Method for extracting concentrated methane from mash gas with middle concentration of methane by pressure varying adsorption technology CN101502740B (en)

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CN102284226A (en) * 2010-06-18 2011-12-21 上海瑞气气体设备有限公司 Pressure swing adsorption separation of methane from the combined process and cryogenic low concentration of CBM
CN102698563B (en) * 2012-06-11 2014-07-09 四川亚连科技有限责任公司 High purity and high recovery rate methane concentration production process and implementing device thereof
CN104436993A (en) * 2014-11-27 2015-03-25 煤炭科学技术研究院有限公司 Concentration separation method for methane in low-concentration gas

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Publication number Priority date Publication date Assignee Title
CN1175474A (en) 1997-04-14 1998-03-11 成都华西化工研究所 Multi-tower pressure swing adsorption method and apparatus for separation of gas
EP1867379A2 (en) 2006-06-13 2007-12-19 Air Products and Chemicals, Inc. Pressure swing adsorption process with improved recovery of high-purity product

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1175474A (en) 1997-04-14 1998-03-11 成都华西化工研究所 Multi-tower pressure swing adsorption method and apparatus for separation of gas
EP1867379A2 (en) 2006-06-13 2007-12-19 Air Products and Chemicals, Inc. Pressure swing adsorption process with improved recovery of high-purity product

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