CN102489113B - Method for recovering organic solvent from organic waste gas - Google Patents
Method for recovering organic solvent from organic waste gas Download PDFInfo
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- CN102489113B CN102489113B CN 201110424881 CN201110424881A CN102489113B CN 102489113 B CN102489113 B CN 102489113B CN 201110424881 CN201110424881 CN 201110424881 CN 201110424881 A CN201110424881 A CN 201110424881A CN 102489113 B CN102489113 B CN 102489113B
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- 239000007789 gas Substances 0.000 title claims abstract description 68
- 239000003960 organic solvent Substances 0.000 title claims abstract description 47
- 239000010815 organic waste Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 34
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 111
- 238000003795 desorption Methods 0.000 claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 239000002912 waste gas Substances 0.000 claims abstract description 7
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 5
- 238000001179 sorption measurement Methods 0.000 claims description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical class O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000009833 condensation Methods 0.000 claims description 4
- 230000005494 condensation Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- YKYONYBAUNKHLG-UHFFFAOYSA-N propyl acetate Chemical compound CCCOC(C)=O YKYONYBAUNKHLG-UHFFFAOYSA-N 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000000746 purification Methods 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract 2
- 238000007599 discharging Methods 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000003344 environmental pollutant Substances 0.000 abstract 1
- 231100000719 pollutant Toxicity 0.000 abstract 1
- 238000011084 recovery Methods 0.000 description 8
- 238000007710 freezing Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000008014 freezing Effects 0.000 description 4
- 230000008929 regeneration Effects 0.000 description 4
- 238000011069 regeneration method Methods 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000002957 persistent organic pollutant Substances 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000010888 waste organic solvent Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
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- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
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Abstract
本发明属于有机废气处理技术领域，涉及一种回收有机废气中有机溶剂的方法，包含以下步骤：首先，将有机废气中的有机溶剂吸附在活性炭内，净化后达标排放；当活性炭吸附饱和后，将管道内残存的有机废气加热，对活性炭吸附的有机溶剂进行脱附，使活性炭再生；将脱附下来的有机溶剂气体再经过热交换、冷凝成液态后回收；冷凝后的废气加热后再次进入脱附饱和的活性炭，如此循环，完成一次脱附。本发明工艺流程简单，操作方便，即节约能源，降低生产成本，又能使废气中有机物质含量低于达到环保排放标准，同时还能使废气中的有机物质作为资源被回收利用，活性炭再生，无二次污染物的排放，经济效益明显，应用领域广泛。
The invention belongs to the technical field of organic waste gas treatment, and relates to a method for recovering organic solvents in organic waste gas, comprising the following steps: firstly, absorbing the organic solvent in the organic waste gas in activated carbon, and then discharging it up to the standard after purification; when the activated carbon is adsorbed and saturated, Heat the organic waste gas remaining in the pipeline to desorb the organic solvent adsorbed by the activated carbon to regenerate the activated carbon; the desorbed organic solvent gas is then heat exchanged and condensed into a liquid state before being recovered; the condensed waste gas is heated and re-entered Desorption of saturated activated carbon, such a cycle, completes a desorption. The invention has simple technological process and convenient operation, saves energy, reduces production cost, and can make the content of organic substances in the waste gas lower than the environmental protection emission standard, and at the same time, the organic substances in the waste gas can be recycled as resources, and the activated carbon can be regenerated. No discharge of secondary pollutants, obvious economic benefits and wide application fields.
Description
技术领域 technical field
本发明属于有机废气处理技术领域，涉及一种通过活性炭吸附-热风脱附-冷冻回收组合操作回收有机废气中有机溶剂的组合方法。 The invention belongs to the technical field of organic waste gas treatment, and relates to a combined method for recovering organic solvents in organic waste gas through combined operations of activated carbon adsorption-hot air desorption-freezing recovery. the
背景技术 Background technique
由于有机溶剂种类繁多，使用广泛且用量巨大，有机溶剂气体不经处理就排入大气，不但有毒副作用，还会在大气的对流层产生酸烟雾、光化学烟雾等，在大气的平流层消耗臭氧，最终会危害人类和动植物的生命安全。而回收的有机溶剂与空气的混合气体经有焰燃烧或无焰催化燃烧虽然能起到解毒作用，但仍会产生大量的温室气体二氧化碳。因此通过液体吸收、固体吸附和冷冻冷凝的办法截留有机溶剂气体，才是解决溶剂回收问题的根本办法。 Due to the wide variety of organic solvents, which are widely used and used in huge quantities, organic solvent gases are discharged into the atmosphere without treatment, which not only has toxic and side effects, but also produces acid smog and photochemical smog in the troposphere of the atmosphere, depleting ozone in the stratosphere of the atmosphere, and eventually It will endanger the life safety of human beings, animals and plants. However, although the mixed gas of the recovered organic solvent and air can be detoxified through flame combustion or flameless catalytic combustion, it will still produce a large amount of greenhouse gas carbon dioxide. Therefore, intercepting organic solvent gas through liquid absorption, solid adsorption and freezing condensation is the fundamental way to solve the problem of solvent recovery. the
但是液体吸收法会产生大量废水，且处理废水费用较大；固体吸附法即采用活性炭吸附，虽然该法是目前吸附有机废气效果最好应用最广泛，但当活性炭吸附饱和后，活性炭就失去了对有机污染物的吸附能力，此时就要么更换活性炭，要么对活性炭进行再生重复使用，更换活性炭不仅成本高，而且更换的劳动强度很大，但采用传统的水蒸汽脱附工艺再生活性炭，也会造成废水产生，带来二次污染；冷冻冷凝法回收溶剂虽然纯度高，但当有机溶剂浓度偏低时回收效果不大，并且该法往往是用做吸收法和吸附法的预处理。 However, the liquid absorption method will produce a large amount of wastewater, and the cost of wastewater treatment is relatively high; the solid adsorption method uses activated carbon adsorption. Although this method is currently the best and most widely used in the adsorption of organic waste gas, when the activated carbon is saturated, the activated carbon will lose. For the adsorption capacity of organic pollutants, at this time, the activated carbon must be replaced or regenerated and reused. The replacement of activated carbon is not only costly, but also labor-intensive. However, the traditional water vapor desorption process is used to regenerate activated carbon. It will cause waste water and cause secondary pollution; although the recovery of solvent by freezing condensation method has high purity, the recovery effect is not great when the concentration of organic solvent is low, and this method is often used as pretreatment of absorption method and adsorption method. the
发明内容 Contents of the invention
本发明目的在于针对现有技术的缺陷，而提供一种回收有机废气中有机溶剂的方法。该方法使有机溶剂资源化，再生活性炭重复吸附有机废气，从而达到减少环境污染，减少资源浪费，实现循环经济的目的。 The purpose of the present invention is to provide a method for recovering organic solvents in organic waste gas aiming at the defects of the prior art. The method makes the organic solvent resourceful, and the regenerated activated carbon repeatedly adsorbs the organic waste gas, so as to reduce environmental pollution, reduce waste of resources, and realize the purpose of circular economy. the
为达到以上目的，本发明所采用的技术方案是： For achieving the above object, the technical scheme adopted in the present invention is:
一种回收有机废气中有机溶剂的方法，包含步骤： A method for recovering organic solvents in organic waste gas, comprising the steps of:
(1)首先，将有机废气中的有机溶剂吸附在活性炭内，经吸附处理后的有机废气得到净化后达标排放； (1) First, the organic solvent in the organic waste gas is adsorbed in the activated carbon, and the organic waste gas after the adsorption treatment is purified and discharged up to the standard;
(2)当活性炭吸附饱和后，将脱附废气管道内残存的含有有机溶剂的有机废气由饱和水 蒸汽间接加热，对吸附在活性炭上的有机溶剂进行脱附，得到高浓度有机溶剂气体，同时使活性炭再生； (2) When the activated carbon is adsorbed and saturated, the organic waste gas containing the organic solvent remaining in the desorption waste gas pipeline is indirectly heated by saturated water vapor, and the organic solvent adsorbed on the activated carbon is desorbed to obtain a high-concentration organic solvent gas, and at the same time regenerate activated carbon;
(3)将步骤(2)中从活性炭上脱附下来的高浓度有机溶剂气体与冷凝后的低浓度有机废气进行热交换，将脱附下来的高浓度有机溶剂气体冷凝到20～40℃，减轻步骤(4)的冷冻机负荷，同时将冷凝后的低浓度有机废气温度从0℃～-30℃提高到60～80℃，降低了步骤(5)的蒸汽消耗； (3) heat-exchange the high-concentration organic solvent gas desorbed from the activated carbon in step (2) with the condensed low-concentration organic waste gas, and condense the desorbed high-concentration organic solvent gas to 20-40°C, Reduce the load of the refrigerator in step (4), and at the same time increase the temperature of the condensed low-concentration organic waste gas from 0°C to -30°C to 60°C to 80°C, reducing the steam consumption in step (5);
(4)将步骤(3)得到的20～40℃高浓度有机溶剂再经过冷冻液冷凝，冷凝成液态溶剂后回收；冷凝后剩余的低浓度有机废气再进入到步骤(3)中去热交换； (4) The 20-40°C high-concentration organic solvent obtained in step (3) is then condensed into a liquid solvent and then recovered; after condensation, the remaining low-concentration organic waste gas enters step (3) for heat exchange ;
(5)将步骤(4)中得到的低浓度有机废气经过步骤(3)中去热交换后温度升到60～80℃，再经过蒸汽间接加热后再次升温到110℃～140℃进入步骤(2)脱附饱和的活性炭，如此循环，完成一次脱附。 (5) The temperature of the low-concentration organic waste gas obtained in step (4) is raised to 60-80°C after heat exchange in step (3), and then heated to 110°C-140°C again after indirect steam heating to enter step ( 2) desorb the saturated activated carbon, and circulate like this to complete one desorption. the
所述的有机废气为印刷行业油墨中产生的有机废气，其包含乙醇、醋酸乙酯或醋酸正丙酯中的一种或一种以上。 The organic waste gas is the organic waste gas generated in printing ink, which contains one or more of ethanol, ethyl acetate or n-propyl acetate. the
所述的高浓度有机废气中有机溶剂的浓度范围是6～12g/m3。 The concentration range of the organic solvent in the high-concentration organic waste gas is 6-12 g/m 3 .
所述的低浓度有机废气中有机溶剂的浓度范围是0～1g/m3。 The concentration range of the organic solvent in the low-concentration organic waste gas is 0-1 g/m 3 .
所述的活性炭优选蜂窝状活性炭。 The activated carbon is preferably honeycomb activated carbon. the
所述的步骤(1)中的活性炭吸附温度为常温。 The activated carbon adsorption temperature in the described step (1) is normal temperature. the
所述的步骤(1)中的吸附设备为活性炭吸附器。 The adsorption equipment in the described step (1) is an activated carbon adsorber. the
所述的步骤(2)的加热温度为110℃～140℃，水蒸气的压力为0.4～0.6MPa。 The heating temperature in the step (2) is 110° C. to 140° C., and the steam pressure is 0.4 to 0.6 MPa. the
所述的步骤(3)中的低浓度有机废气为高浓度有机溶剂气体经过0℃～-30℃的冷凝后得到的气体。 The low-concentration organic waste gas in the step (3) is the gas obtained after the high-concentration organic solvent gas is condensed at 0°C to -30°C. the
所述的步骤(4)中冷凝回收有机溶剂的温度是0℃～-40℃。 The temperature for condensing and recovering the organic solvent in the step (4) is 0°C to -40°C. the
所述的步骤(5)中废气的加热的温度为110℃～140℃。 The heating temperature of the exhaust gas in the step (5) is 110°C to 140°C. the
所述的步骤(5)中完成一次脱附循环时间6～8小时。 In the step (5), the desorption cycle time is 6 to 8 hours. the
步骤(2)中，将有机废气由间接蒸汽加热到110℃～140℃，经脱附，与冷冻后的有机废气进行热交换的目的就是充分利用冷热能源，因为回收有机溶剂是需要低温，而进行脱附有机溶剂再生活性炭又要在高温110℃～140℃之间，所以为了不浪费彼此的能源，将二者进行冷热交换进行第一次热交换，温度下降到20～40℃，再进入冷冻到0℃～-40℃回收有机溶剂液体，而冷冻后的有机废气通过第一次热交换后其温度升到60～80℃，再由蒸汽间接加热到110℃～140℃形成热风继续去活性炭吸附器进行脱附工作，封闭循环，冷能、热能充分利用。 In step (2), the organic waste gas is heated to 110°C to 140°C by indirect steam, and after desorption, the purpose of heat exchange with the frozen organic waste gas is to make full use of cold and heat energy, because the recovery of organic solvents requires low temperature, The desorption of organic solvents to regenerate activated carbon requires a high temperature between 110°C and 140°C, so in order not to waste each other's energy, the two are exchanged for the first heat exchange, and the temperature drops to 20-40°C. Then enter into freezing to 0℃～-40℃ to recover organic solvent liquid, and the temperature of frozen organic waste gas rises to 60～80℃ after the first heat exchange, and then indirectly heated to 110℃～140℃ by steam to form hot air Continue to go to the activated carbon adsorber for desorption work, close the cycle, and make full use of cold energy and heat energy. the
冷冻后的有机气体中的有机溶剂冷凝成液体直接回收再利用，无有机溶剂排放，无二次污染产生。 The organic solvent in the refrigerated organic gas is condensed into a liquid and directly recycled and reused, no organic solvent is discharged, and no secondary pollution occurs. the
整个系统处于密闭进行，无废气泄漏安全可靠，换热效果好，既节能又减排。 The whole system is airtight, safe and reliable without exhaust gas leakage, good heat exchange effect, energy saving and emission reduction. the
整个系统无外加辅助介质，所以无废水产生，没有二次污染，没有废水处理。 The whole system has no external auxiliary medium, so there is no waste water generation, no secondary pollution, and no waste water treatment. the
由于采用了上述方案，本发明具有以下特点： Owing to adopted above-mentioned scheme, the present invention has following characteristics:
1.流程简单，无须复杂的预处理工序； 1. The process is simple and does not require complicated pretreatment procedures;
2.活性炭使用寿命长：通过热风脱附工艺再生活性炭，延长了活性炭的使用寿命，大大降低了运行成本； 2. Long service life of activated carbon: regenerated activated carbon through hot air desorption process, which prolongs the service life of activated carbon and greatly reduces operating costs;
3.无二次污染：通过热风脱附工艺再生活性炭比较传统的水蒸汽脱附工艺再生活性炭，无废水产生，没有二次污染，实现了清洁生产目的； 3. No secondary pollution: Compared with the traditional water vapor desorption process to regenerate activated carbon through hot air desorption process, there is no waste water and no secondary pollution, which realizes the purpose of clean production;
4.经过冷冻，脱附下来的高浓度有机溶剂回收纯度高，不加其他处理即可循环使用，减少环境污染，减少资源浪费，实现了循环经济目的； 4. After freezing, the desorbed high-concentration organic solvent has high recovery purity and can be recycled without other treatment, reducing environmental pollution and resource waste, and achieving the purpose of circular economy;
5.节约能源，经过冷、热能的交换，能量利用率高，运行成本低。 5. Energy saving, through the exchange of cold and heat energy, the energy utilization rate is high and the operating cost is low. the
附图说明 Description of drawings
图1为本发明的工艺流程图。 Fig. 1 is a process flow diagram of the present invention. the
附图标注： Attached annotations:
1活性炭吸附器， 2吸附风机， 1 Activated carbon adsorber, 2 Adsorption fan,
3板式换热器， 4蒸发器， 3 plate heat exchangers, 4 evaporators,
5脱附风机， 6蒸汽加热器， 5 desorption fan, 6 steam heater,
7补冷风机， 8集液罐。 7 Supplementary cooling fans, 8 Liquid collection tanks. the
具体实施方式 Detailed ways
以下结合附图所示实施例对本发明作进一步的说明。 The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings. the
(1)集中有机废气(Q1)，通过风机送到活性炭吸附器①，在常温下进行吸附净化，废气中的有机污染物被活性炭吸附，达到气体洁净标准的有机气体(Q2)由吸附风机②排放到大气中去。 (1) Concentrate the organic waste gas (Q1), send it to the activated carbon adsorber ① through the fan, and carry out adsorption and purification at room temperature. The organic pollutants in the waste gas are adsorbed by the activated carbon, and the organic gas (Q2) that meets the gas clean standard is sent by the adsorption fan ② discharged into the atmosphere. the
(2)当活性炭吸附器吸附饱和后，活性炭吸附器进入热风脱附再生阶段。 (2) When the activated carbon adsorber is saturated, the activated carbon adsorber enters the hot air desorption regeneration stage. the
在脱附阶段，利用脱附废气管道内残存的有机废气(我们谓之“冷风”)经过板式换热器③和蒸发器④，由脱附风机⑤送入到蒸汽加热器⑥，由来自锅炉房内0.4～0.6MPa饱和水蒸汽 间接加热到脱附所需温度110℃～140℃(我们谓之“热风”)，热风进入活性炭吸附器内加热活性炭，吸附在活性炭内的有机污染物从活性炭内脱离出来并形成6～12g/m3高浓度有机溶剂(Q3)，同时使活性炭再生； In the desorption stage, the residual organic waste gas in the desorption waste gas pipeline (we call it "cold air") passes through the plate heat exchanger ③ and the evaporator ④, and is sent to the steam heater ⑥ by the desorption fan ⑤, and is sent to the steam heater ⑥ by the boiler. The 0.4~0.6MPa saturated water vapor in the room is indirectly heated to the temperature required for desorption of 110°C~140°C (we call it "hot air"). The hot air enters the activated carbon adsorber to heat the activated carbon, and the organic pollutants adsorbed in the activated carbon are released from the activated carbon. The internal detachment and the formation of 6 ~ 12g/ m3 high-concentration organic solvent (Q3), while regenerating the activated carbon;
(3)将步骤(2)中从活性炭上脱附出来的高温高浓度有机溶剂(“热风”)与冷凝后的有机废气(Q5)(“冷风”)在板式换热器③内进行热交换，“热风”温度降到20～40℃左右(Q4)，减轻步骤(4)的冷冻机负荷，而“冷风”(Q5)则由0℃～-40℃左右升温到60～80℃左右(Q6)，降低了步骤(5)的蒸汽消耗； (3) The high-temperature and high-concentration organic solvent ("hot air") desorbed from the activated carbon in step (2) is exchanged with the condensed organic waste gas (Q5) ("cold air") in the plate heat exchanger ③ , the temperature of the "hot air" drops to about 20-40°C (Q4), and the load of the refrigerator in step (4) is reduced, while the temperature of the "cold air" (Q5) is raised from about 0°C to -40°C to about 60-80°C ( Q6), reduced the steam consumption of step (5);
(4)将步骤(3)得到的20～40℃左右的“热风”(Q4)再进入蒸发器④内冷却降温到0℃～-40℃，此时，废气中的有机溶剂逐步冷凝形成液滴，进入集液罐⑧备用。而高浓度有机溶剂中的有机物浓度也随之下降，然后，该股“冷风”(Q5)再经过换热器，与“热风”进行热交换，充分循环利用“热风”的能源，同时“热风”降温也充分利用了“冷风”的冷源。 (4) The "hot air" (Q4) at 20-40°C obtained in step (3) enters the evaporator ④ to cool down to 0°C--40°C. At this time, the organic solvent in the exhaust gas gradually condenses to form a liquid drop into the liquid collection tank ⑧ for later use. The concentration of organic matter in the high-concentration organic solvent also decreases. Then, the "cold air" (Q5) passes through the heat exchanger to exchange heat with the "hot air", fully recycling the energy of the "hot air", while the "hot air" "The cooling also makes full use of the cold source of the "cold wind". the
(5)升温到60～80℃左右的“冷风”(Q6)再由脱附风机⑤送入蒸汽加热器⑥，由蒸汽间接加热升温至110℃～140℃(Q7)(热风)，进入活性炭吸附器内①脱附再生，完成了整个循环。完成一次脱附循环时间6～8小时。 (5) The "cold air" (Q6) heated to about 60-80°C is sent to the steam heater ⑥ by the desorption fan ⑤, heated indirectly by steam to 110-140°C (Q7) (hot air), and enters the activated carbon ① Desorption and regeneration in the adsorber completes the whole cycle. It takes 6 to 8 hours to complete a desorption cycle. the
(6)脱附时通过补冷风机⑦的运行，控制进入活性炭吸附器内气体的温度不超过设定温度。 (6) During desorption, the temperature of the gas entering the activated carbon adsorber is controlled not to exceed the set temperature through the operation of the supplementary cooling fan ⑦. the
当脱附再生完毕后，活性炭吸附器的吸附活性得以恢复，重新进入有机废气的吸附工作。 After the desorption regeneration is completed, the adsorption activity of the activated carbon adsorber is restored, and the adsorption work of organic waste gas is resumed. the
在实际运行过程中，蒸汽加热器⑥和冷冻系统只是在脱附启动阶段时需要全负荷使用，当活性炭加热到设定的温度后，由于设置了板式换热器，蒸汽加热器和冷冻系统均不需要全负荷运行。这样就可以达到能源充分利用，尽可能降低活性炭脱附再生的成本。蒸汽加热器和冷冻系统的开启与关闭均是根据自动温控系统自动控制。 In the actual operation process, the steam heater ⑥ and the refrigeration system only need to be used at full load during the desorption start-up stage. When the activated carbon is heated to the set temperature, the steam heater and the refrigeration system are both Full load operation is not required. In this way, full utilization of energy can be achieved, and the cost of desorption and regeneration of activated carbon can be reduced as much as possible. The opening and closing of the steam heater and the refrigeration system are automatically controlled according to the automatic temperature control system. the
本发明的活性炭吸附-热风脱附-冷冻回收处理有机废气回收有机溶剂组合工艺，已在某印刷公司有机废气处理工程上使用验证，通过实际运行后的效果来看，实现了废有机溶剂资源化，有机废气达标排放。 The combined process of activated carbon adsorption-hot air desorption-freezing recovery treatment of organic waste gas and organic solvent recovery of the present invention has been used and verified in the organic waste gas treatment project of a printing company. According to the effect after actual operation, the waste organic solvent has been realized as a resource. , Organic waste gas emission up to standard. the
上述的对实施例的描述是为便于该技术领域的普通技术人员能理解和应用本发明。熟悉本领域技术的人员显然可以容易地对这些实施例做出各种修改，并把在此说明的一般原理应用到其他实施例中而不必经过创造性的劳动。因此，本发明不限于这里的实施例，本领域技术人员根据本发明的揭示，不脱离本发明范畴所做出的改进和修改都应该在本发明的保护范围之内。 The above description of the embodiments is for those of ordinary skill in the art to understand and apply the present invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without creative efforts. Therefore, the present invention is not limited to the embodiments herein. Improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should fall within the protection scope of the present invention. the
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