WO2014117571A1 - 水洗尾气回收二氧化硫*** - Google Patents

水洗尾气回收二氧化硫*** Download PDF

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Publication number
WO2014117571A1
WO2014117571A1 PCT/CN2013/087572 CN2013087572W WO2014117571A1 WO 2014117571 A1 WO2014117571 A1 WO 2014117571A1 CN 2013087572 W CN2013087572 W CN 2013087572W WO 2014117571 A1 WO2014117571 A1 WO 2014117571A1
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Prior art keywords
water
sulfur dioxide
washing
gas
degassing
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PCT/CN2013/087572
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English (en)
French (fr)
Inventor
严利
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Yan Li
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Publication of WO2014117571A1 publication Critical patent/WO2014117571A1/zh

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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/48—Sulfur dioxide; Sulfurous acid
    • C01B17/50—Preparation of sulfur dioxide
    • C01B17/60—Isolation of sulfur dioxide from gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1425—Regeneration of liquid absorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1456—Removing acid components
    • B01D53/1481—Removing sulfur dioxide or sulfur trioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/10—Inorganic absorbents
    • B01D2252/103—Water

Definitions

  • This invention relates to the industrial field of recycling sulfur dioxide from industrial off-gases, and more particularly to the recovery of sulfur dioxide from water-washed tail gas. Halo technology
  • sulfur dioxide is harmful to the environment.
  • Sulfur dioxide is currently the most harmful of air pollutants. China's annual emissions amount to 15.2 million tons, ranking third in the world, causing environmental pollution and waste of sulfur resources. Sulfur dioxide pollution has become a major obstacle to the sustainable development of China's economy and society. Therefore, it is imperative to control sulfur dioxide pollution.
  • desulfurization technologies commonly used, and the reaction states according to the desulfurization process can be roughly classified into three types: dry method, semi-dry method and wet method. Due to the large amount of wet desulfurization treatment, continuous operation, low investment and operating costs, the industry mainly uses wet desulfurization to treat sulfur dioxide-containing gases. Wet desulfurization generally uses a liquid desulfurizer to physically or chemically absorb sulfur dioxide to form a sulfur-containing solution, and the sulfur solution is desorbed to release sulfur dioxide. The desorbed sulfur dioxide can be further recycled.
  • the Chinese invention patent application discloses a method for removing sulfur dioxide from sulfuric acid industrial tail gas, recovering sulfuric acid, and concealing.
  • the method is to remove sulfur dioxide from the flowing sulfuric acid industrial tail gas and recover sulfuric acid by using an aqueous solution of hydrogen peroxide in the absorption tower.
  • the occlusion includes an absorption tower, a spray trap and a defogger.
  • the spray lock consists of a circulation pump, a metering pump, a hydrogen peroxide storage tank and a shower.
  • the absorption tower is provided with an air inlet and an air outlet, and the absorption tower is provided.
  • a collection tank From the bottom to the top, there are a collection tank, a gas distribution plate, a dilute acid-resistant filler, a shower, and a mist eliminator.
  • the bottom of the collection tank is provided with a circulation port and a liquid discharge port, and the circulation port is connected with the shower device through the circulation pump.
  • Liquid port There is a valve, and the hydrogen peroxide storage tank is connected to the inlet of the circulation pump through the metering pump.
  • the technical effect of the invention is to remove sulfur dioxide in the tail gas of the sulfuric acid industry and recycle it, which can reduce the production cost of sulfuric acid and prevent secondary pollution.
  • the invention involves only the concealment of a single recovered sulfur dioxide, the net recovery of sulfur dioxide is not sufficient, and sulfur dioxide cannot be fully recovered.
  • the Chinese utility model new patent discloses a concealing of a water containing sulphur dioxide, including a water washing tower, a degassing tower, a slag liquid recovery tank, and a water washing tower bottom tank.
  • the circulating fluid outlet is connected to the circulating pump inlet of the slurry pump and the degassing tower through the pipeline; the upper part of the degassing tower is provided with a circulating liquid inlet, the top is provided with a gas outlet, the bottom is provided with a bottoming tank of the degassing tower, and the bottom of the degassing tower is provided. It is connected to the slag liquid recovery tank through a pipeline.
  • the utility model adopts water as a circulating liquid, and can separate the impurities in the sulfur-containing gas from the flue gas, and cool the circulating liquid of the high-pass which is in contact with the flue gas in the degassing tower, and collect the residual sulfur dioxide gas therein,
  • the circulating waste liquid degassed through the degassing tower is used to recover solid impurities in the slag liquid recovery tank.
  • the disadvantage of the utility model is that the circulating fluid remaining after the sulfur dioxide is desorbed in the degassing tower needs to be pumped back to the water washing tower for circulation and degassing through the circulation pump hidden by the outer peripheral, which increases the cost and energy consumption, and is not fully sufficient. Recycling of sulfur dioxide.
  • the technical problem to be solved by the present invention is to provide a circulating flow of a circulating liquid in a water-washed exhaust gas recovery sulfur dioxide system without requiring a power-carrying, which is simpler and more energy-saving.
  • the sulfur dioxide system is recovered from the washed tail gas of the recovered sulfur dioxide more fully.
  • the present invention provides a water scrubbing tail gas recovery sulfur dioxide system, including water washing and degassing and hiding; the water washing and degassing concealing is provided with a circulating liquid outlet at the lower or bottom portion, and the upper portion or the top portion is provided. Circulating fluid inlet; said The water-washed and clogging circulating fluid outlet is connected to the degassing and concealing circulating liquid inlet through a pipeline, and the degassed and sealed circulating fluid outlet is connected to the water-washed and circulated circulating fluid inlet through a pipeline; In that, the degassing enclosure is entirely enclosed above the horizontal line of the top of the washing and clogging.
  • the difference method and the principle of the force can be used, and it is not necessary to set any power to hide between the water washing and the degassing and hiding.
  • the circulation of the circulating fluid not only simplifies the installation process, but also saves costs, and at the same time achieves the technical effects of energy saving and environmental protection.
  • the water washing is concealed as a bubble column, and the degassing is concealed as at least one desorption column.
  • the at least one desorption column is connected in plurality.
  • the water-washed tail gas recovery sulfur dioxide system further comprises a circulation pump, and the circulation pump is disposed on the pipeline connected to the water-washed circulating fluid outlet and the degassed and sealed circulating fluid inlet.
  • the water washing and hiding unit is provided with an inlet for containing sulfur dioxide gas, and a gas outlet is arranged at the top; and the water washing and hiding device is further provided with a water filling inlet.
  • the upper or top of the desorption column is provided with a gas outlet, and the lower part is provided with a gas inlet.
  • the gas inlets of the plurality of parallel first desorption columns are input with normally-on air, and the gas outlet of the terminal desorption column outputs sulfur dioxide gas to the acid-making system; and the plurality of parallel desorption columns are The gas inlet and the gas outlet are connected by a pipe.
  • the water-washing and clogging circulating fluid outlet is provided with an absorption acid tank on the pipeline connected to the degassed and sealed circulating fluid inlet.
  • a valve is disposed on the input pipe of the absorption acid tank.
  • a valve is provided at the inlet of the circulating fluid at the top or top of the degassing device.
  • a valve is disposed at the outlet of the circulating fluid at the bottom or bottom of the degassing device.
  • the water washing and concealing interior is provided with a spray concealing, and the spray concealing is in communication with the water washing and concealing circulating liquid inlet.
  • Figure 1 is a schematic view of the present invention.
  • the water washing of the gas containing sulfur dioxide includes a water washing tower, a degassing tower, a circulation pump, a slurry pump, and a slag liquid recovery tank.
  • the lower part of the washing tower is provided with a flue gas inlet
  • the top is provided with a flue gas outlet
  • the bottom is provided with a bottom trough
  • the bottom trough is provided with a circulating liquid outlet
  • the inside of the washing tower is provided with three spray pipes from top to bottom, and the sprinkling pipe passes through the pipeline. Connected to the slag recovery tank.
  • the upper part of the degassing tower is provided with a circulating fluid inlet, the top is provided with a gas outlet, the bottom is provided with a bottom tank, and the bottom tank is connected with the slag liquid recovery tank through the pipeline.
  • the circulating liquid outlet of the water washing tower is connected to the circulating liquid inlet of the degassing tower through the slurry pump, and the circulating circulating liquid containing the sulfur dioxide gas in the water washing tower is discharged through the circulating liquid outlet, and is pumped into the degassing tower by the slurry pump.
  • Circulating fluid inlet circulating fluid in degassing tower After cooling and desorbing the sulfur dioxide, it is discharged through the gas outlet, and the remaining circulating liquid flows into the slag liquid recovery tank through the bottom tank, and the circulating liquid in the slag liquid recovery tank is pumped back into the spray pipe of the water washing tower through the circulation pump.
  • the circulating flow of the circulating liquid recovers the sulfur dioxide gas by performing water elution and absorption of the sulfur-containing gas.
  • the present invention includes a water washing and degassing and concealing; a bottom portion of the water washing and degassing is provided with a circulating liquid outlet, and an upper or top portion is provided with a circulating liquid inlet;
  • the congested circulating fluid outlet is connected to the degassing and concealed circulating fluid inlet through a pipe, and the degassed and sealed circulating fluid outlet is connected to the water-washed circulating circulating fluid inlet through a pipe;
  • the gas-encapsulated whole is concealed above the top horizontal line of the washing and clogging.
  • the water-washed tail gas recovery sulfur dioxide system further includes a circulation pump 3 disposed on the pipe to which the water-washed circulating fluid outlet 11 is connected to the deaerated circulating fluid inlet 8.
  • the water washing and concealing portion is provided with an inlet 4 for containing sulfur dioxide gas, and a gas outlet 5 is arranged at the top; and the water washing and hiding device is further provided with a water supply inlet 14.
  • An absorption acid tank 13 is provided in the pipe to which the water-washed circulating fluid outlet 11 is connected to the degassing and locked circulating fluid inlet 8.
  • a valve 105 may be provided on the input pipe of the absorption acid tank 13.
  • a valve may be provided at the outlet of the circulating fluid at the upper or top of the degassing and at the outlet of the degassing or the bottom of the circulation.
  • the water washing and concealing interior is provided with a spray concealing, and the spray concealing is in communication with the circulating washing liquid inlet of the water washing and concealing.
  • the water washing is concealed as a foaming tower 1, the degassing is concealed as at least one desorption tower 2; the lower or bottom of the foaming tower 1 is provided with a circulating liquid outlet 11, and the upper or the top is provided with a circulating liquid inlet 12
  • the lower part of the bubble tower 1 is provided with an inlet 4 containing sulfur dioxide gas, and a gas outlet 5 is arranged at the top.
  • the lower part or the bottom of the desorption tower 2 is provided with a circulating liquid outlet 6, and the upper part or the top is provided with a circulating liquid inlet 8; the upper part or the top of the desorbing tower 2 is provided with a gas outlet 9, and the lower part is provided with a gas inlet 7.
  • the circulating liquid outlet 11 of the bubble column 1 is connected to the circulating liquid inlet 8 of the desorption column 2 through a pipe, and the circulating liquid outlet 6 of the desorption column 2 passes through the pipe and the The circulation liquid inlet 12 of the bubble column 1 is connected; the desorption column 2 is entirely enclosed above the top horizontal line of the bubble column 1, and the desorption column 2 can be closed in any known manner, for example, the desorption column Or raise the platform to hide.
  • the water-washed tail gas recovery sulfur dioxide system further includes a circulation pump 3 disposed on a pipe connected to the circulating liquid outlet 11 of the bubble column 1 and the circulating liquid inlet 8 of the desorption column 2.
  • the inside of the bubble tower 1 is provided with a spray and a cover, and the spray can be a conventional spray pipe and a shower head.
  • the spray concealment is in communication with the water-washed confined circulating fluid inlet.
  • the sulfur-containing industrial tail gas enters the bubble tower 1 from the gas inlet 4, and is connected to the water sprayed by the spray, and is washed by the water in the bubble tower 1 to dissolve most of the sulfur dioxide in the industrial exhaust gas entering the tower.
  • the exhaust gas that meets the environmental protection standards after washing is discharged into the air from the gas outlet 5 of the bubble tower 1.
  • the temperature of the industrial exhaust gas before entering the bubble column 1 is generally 55-85 ° C.
  • the circulating fluid which absorbs most of the sulfur dioxide is output from the circulating liquid outlet 11 of the bubble column 1 and is washed with water. The output of the circulating fluid is cooled to less than 50 e C.
  • the circulating liquid is pumped into the circulating liquid inlet 8 of the desorption column 2 through the circulation pump, and the normally-passing air is input into the gas inlet 7 of the desorption column 2, and the circulating liquid entering the desorption column 2 is mixed with the input normally-passing air, less than 50
  • the circulating water temperature of ° is in contact with the normal temperature air, so that the sulfur dioxide is sucked out and recovered, and the gas outlet 9 of the desorption tower 2 is output to the negative pressure system for producing sulfuric acid supplemental air for direct recycling (any concentration of sulfur dioxide can be directly used).
  • the sulfur dioxide recovered in the circulating liquid after the bubble column 1 exists in two forms, a part of which is in a gaseous state, and the other part is a liquid of sulfurous acid formed by dissolving a small amount of sulfur dioxide in water; a circulating liquid containing sulfurous acid, according to the absorption acid tank 13
  • the hydration demand, the circulating liquid containing this part of sulfurous acid is input into the absorption acid tank 13 through the control valve 105, and then the partial sulfuric acid is decomposed and all recycled.
  • This part of the circulating fluid can be directly recycled, no need to carry out sewage treatment as in the general process; it is economical and environmentally friendly.
  • Example 2 Since the exhaust gas in the bubble tower 1 is discharged at a high altitude, a part of the steam in the exhaust gas is discharged into the air, so it is necessary to replenish water from the water supply inlet 14 , and the amount of water supplement depends on the amount of water shortage.
  • Example 2
  • the desorption column 2 is a plurality of parallels, and the specific number depends on actual production needs.
  • the gas inlet 71 between the plurality of parallel desorption columns is connected to the gas outlet 9 by a pipe.
  • the first gas inlet 7 of the desorption column 2 connected to the circulation pump 3 is supplied with normally-on air, and the gas outlet 91 of the desorbing column 21 at the end is output of sulfur dioxide gas to the acid-making system. .
  • the circulating water after desorption in a plurality of desorption towers is sealed by water by a difference method, and then returned to the upper part of the bubble tower 1 for recycling.
  • the circulating fluid inlets 8, 81 at the upper or top of the desorption column 2, 21 are provided with valves 102, 104, and the circulating liquid outlets 6, 61 at the lower or bottom of the desorption column are provided with valves 101, 103 to control the reflux into the foam.
  • a plurality of desorption towers can ensure that most of the sulfur dioxide in the recycled water after being washed is recycled; and can be flexibly allocated according to the amount of circulating water, even if a single device occurs, the whole system suffers less color noise; The same amount of water, a single desorption tower is not only a large volume, but there is no spare after the array, can only be temporarily directly emptied or discontinued maintenance.
  • the water-washing and degassing concealing system of the present invention is a gas absorbing apparatus in which the gas and the absorbent liquid are in intimate contact in the field of exhaust gas or exhaust gas recycling to achieve high-efficiency absorption of the gas component.
  • the water washing and hiding may be any one of the prior art that has a water-washing sulfur dioxide gas and a precipitation function, such as a tail washing tower, a washing recovery tower, and a water washing.
  • the recovery tower or the like; the degassing and concealing may be any of the prior art functions of absorbing sulfur dioxide gas, such as an absorption tower, a sulfur dioxide recovery tower, a gas separation and recovery tower, and the like.
  • the towers mainly include spray towers (commonly known as empty towers), packed towers, slab towers, spheroidal towers, bubble towers, etc., and many other equipment, such as tube-type wet-wall absorbers, venturi jet absorption » Spray Absorption, etc.
  • the spray tower has a simple structure, and only a plurality of nozzles are arranged in the tower, the gas enters from the lower part, and the liquid is sprayed from the upper part.
  • the upper part of the tower is equipped with defogging.
  • a plurality of slabs are installed along the tower height, and the liquid flows from the top to the bottom of the tower by the force of the force, and forms a liquid liquid flow on the plurality of plates; the gas is pushed by the pressure difference From the bottom of the tower, through the liquid show on each tray in turn, to the top of the tower.
  • the gas and liquid phases are stepwise contacted in the column, and the composition of the two phases changes stepwise along the height of the column.
  • the plate towers are divided into various types according to the form of the plates, such as a bubble column, a bubble column, a spray plate column, a float valve tower, and the like.
  • the selection of the water washing and degassing and hiding is not the realization of the technical effect of the color sounding, for example, the tail washing tower can be used together with the absorption tower or the water washing and recycling tower with the sulfur dioxide recovery tower, etc., as long as the gas is removed during installation. It can be safely flowed back to the top of the horizontal line of the washing and washing, so that the circulating liquid can naturally flow back to the water to be washed and concealed, thereby achieving the technical effect of simplifying and reducing the steps and costs of installing the washed tail gas to recover the sulfur dioxide system.
  • the above has described in detail the preferred embodiments of the invention. It should be understood that many modifications and variations can be made in the present invention without departing from the scope of the invention. Therefore, any technical solution that can be obtained by a person skilled in the art according to the prior art by logic analysis, reasoning or limited experiment according to the prior art should be within the scope of protection defined by the claims. .

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Abstract

提供一种水洗尾气回收二氧化硫***，包括水洗装置和脱气装置，所述水洗装置和脱气装置的下部或底部设有循环液出口，上部或顶部设有循环液进口，所述水洗装置的循环液出口（11）通过管道与所述脱气装置的循环液进口（8）相连，所述脱气装置的循环液出口（6）通过管道与所述水洗装置的循环液进口（12）相连，其特征在于，所述脱气装置整体安置于所述水洗装置顶部水平线上方。利用位差法和重力原理，无需在水洗装置和脱气装置间设置任何动力装置即可实现循环液的循环，简化流程、节约成本，且节能、环保。

Description

说明书
水洗尾气回收二氧化硫*** 技术领域
本发明涉及回收利用工业尾气中二氧化硫的工业领域，尤 其是涉及水洗尾气回收二氧化硫***。 背暈技术
硫酸工业尾气中 ，主要是二氧化硫对环境有危害。 二氧化 硫是目前大气污染物中危害最大的一种 ，我国年排放量达 1520 万吨 ，排在世界第三位，造成了环境污染和硫资源浪费。 二氧 化硫污染已成为制约我国经济、 社会可持续发展的霣要因棄 ， 因此控制二氧化硫污染势在必行。目前常用的脱硫技术有很多 种 ，按脱硫工艺的反应状态大致可分为干法、 半干法和湿法三 类。 由于湿法脱硫处理量大 ， 操作连续 ， 投资和操作费用低 ， 因此工业上主要采用湿法脱硫来处理含二氧化硫的气体。湿法 脱硫一般利用液体脱硫剂物理或化学吸收二氧化硫而形成寓 硫溶液，寓硫溶液再解吸而放出二氧化硫。 脱吸出的二氧化硫 可进一步回收利用。
中国发明专利申请（ 申请号 ： 201110132716.3 )公开了一 种脱除硫酸工业尾气中二氧化硫、 回收硫酸的方法及装匿。方 法为在吸收塔内使用双氧水溶液脱除流动的硫酸工业尾气中 二氧化硫、 回收硫酸。 装匿包括吸收塔、 喷淋装匿和除雾器 ， 喷淋装匿由循环泵、 计量泵、 双氧水储槽和喷淋器组成 ，吸收 塔上设有进气口和出气口 ，吸收塔内从下至上依次设有收集槽、 气体分布板、 耐稀酸填料、 喷淋器、 除雾器，收集槽底部设有 循环口和排液口 ，循环口经循环泵与喷淋器连通，排液口上设 有阀门 ，双氧水储槽经计量泵与循环泵进液口连通。 该发明创 造的技术效果是脱除硫酸工业尾气中的二氧化硫并回收利用 ， 可降低硫酸的生产成本且防止二次污染。但由于该发明创造仅 涉及单个回收二氧化硫的装匿 ，对二氧化硫的净回收还不够 ， 不能完全充分地回收利用二氧化硫。
针对上述缺点 ，中国实用型新专利（专利号 ： CN 202538564 U )公开了一种对寓含二氧化硫的气体进行水洗的装匿 ，包括 水洗塔、 脱气塔、 渣液回收槽 ，水洗塔底槽的循环液出口经管 路与浆料泵和脱气塔的循环液进口相连 ；脱气塔上部设有循环 液进口 ，顶部设有气体出口 ，底部设有脱气塔底槽 ，脱气塔底 槽经管路与渣液回收槽相连。 该实用新型采用水作为循环液 ， 能将寓硫气体中的杂质与烟气分离 ，对和烟气接触的高通的循 环液在脱气塔中进行冷却 ，将其中残余的二氧化硫气体进行收 集，可以对经过脱气塔脱气的循环液在渣液回收槽内实现固体 杂质回收。 该实用新型的的缺点在于 ，脱气塔内脱吸出二氧化 硫后剩余的循环液需通过钡外设匿的循环泵才能泵回水洗塔 中循环脱气，增加了成本和能耗 ，也不能完全充分的回收利用 二氧化硫。
因此，本领域的技术人员致力于开发一种更简便、 更节能 且更充分地回收利用硫酸工业尾气中二氧化硫的***。 发明内容
有鉴于现有技术的上述缺陷 ，本发明所要解决的技术问厘 是提供不需要设匿钡外的动力装匿即能实现水洗尾气回收二 氧化硫***中循环液的循环流动 ，从而更简便、 更节能且更充 分地利用回收后的二氧化硫的水洗尾气回收二氧化硫***。
为实现上述目的 ，本发明提供了水洗尾气回收二氧化硫系 统 ，包括水洗装匿和脱气装匿 ；所述水洗装匿和脱气装匿的下 部或底部设有循环液出口 ，上部或顶部设有循环液进口 ；所述 水洗装匿的循环液出口通过管道与所述脱气装匿的循环液进 口相连接 ，所述脱气装匿的循环液出口通过管道与所述水洗装 匿的循环液进口相连接；其特征在于 ，所述脱气装匿整体安匿 于所述水洗装匿顶部水平线上方。
采用上述技术方案，通过设匿水洗装匿与脱气装匿的安装 位匿 ，利用位差法及霣力原理 ，无需在水洗装匿与脱气装匿之 间设匿任何动力装匿即可实现循环液的循环，既简化了安装流 程 ， 也节约了成本 ， 同时达到了节能和环保的技术效果。
作为本发明的一个实施例 ，所述水洗装匿为泡沬塔，所述 脱气装匿为至少一个脱吸塔。
优选的 ， 所述至少一个脱吸塔为多个并联。
优选的 ， 所述水洗尾气回收二氧化硫***还包括循环泵， 所述循环泵设于所述水洗装匿的循环液出口与所述脱气装匿 的循环液进口相连接的管道上。
优选的 ， 所述水洗装匿下部设有寓含二氧化硫气体进口 ， 顶部设有气体出口 ； 所述水洗装匿还设有补水进口。
优选的 ，所述脱吸塔上部或顶部设有气体出口 ，下部设有 气体进口。
进一步的 ，所述多个并联的首个脱吸塔的气体进口处输入 常通空气，所述末端脱吸塔的气体出口输出二氧化硫气体至制 酸*** ；所述多个并联的脱吸塔之间的气体进口与气体出口以 管道相连接。
优选的 ，所述水洗装匿的循环液出口与所述脱气装匿的循 环液进口相连接的管道上设有吸收酸槽。
进一步的 ， 所述吸收酸槽的输入管道上设有阀门。
优选的 ，所述脱气装匿上部或顶部的循环液进口处设有阀 门。
优选的 ，所述脱气装匿下部或底部的循环液出口处设有阀 门。 优选的 ，所述水洗装匿内部设有喷淋装匿，所述喷淋装匿 与所述水洗装匿的循环液进口相连通。
采用多个并联的脱吸塔的技术方案 ，达到的技术效果为 ： 多个脱吸塔并联淋降含有二氧化硫的循环液体，同时向并联的 脱吸塔中补充少量常温空气，通过调整气液之比，达到更完全 地回收二氧化硫的技术效果。 以下将结合附图对本发明的构思、具体结构及产生的技术 效果作进一步说明 ，以充分地了解本发明的目的、特征和效果。 附图说明
图 1是本发明的示意图。
其中 ， 1为泡沬塔； 2， 21为脱吸塔； 3为循环泵； 4为泡 沬塔的气体进口 ； 5为泡沬塔的气体出口 ； 6,61为脱吸塔的循 环液出口 ；7,71为脱吸塔的气体进口 ；8,81为脱吸塔的循环液 进口 ； 9， 91 为脱吸塔的气体出口 ； 101,102,103 ， 104， 105 为阀门 ； 11 为泡沬塔的循环液出口 ； 12为泡沬塔的循环液进 口 ； 13为吸收酸槽 ； 14为补水进口。 具体实施方式
现有技术中 ，对寓含二氧化硫的气体进行水洗的装匿包括 水洗塔、 脱气塔、 循环泵、 浆料泵、 渣液回收槽。 水洗塔下部 设有烟气进口 ，顶部设有烟气出口 ，底部设有底槽 ，底槽设有 循环液出口 ，水洗塔内部自上而下设有 3个喷淋管 ，喷淋管经 管路与渣液回收槽相连。 脱气塔上部设有循环液进口 ，顶部设 有气体出口 ， 底部设有底槽 ， 底槽经管路与渣液回收槽相连。 水洗塔的循环液出口经浆料泵与脱气塔的循环液进口相连，寓 含二氧化硫气体在水洗塔中水洗后剩余的循环液经循环液出 口输出 ，由浆料泵泵入脱气塔的循环液进口 ，循环液在脱气塔 中冷却并脱吸出二氧化硫后通过气体出口排出 ，剩余的循环液 经底槽流入渣液回收槽，渣液回收槽中的循环液经循环泵泵回 水洗塔的喷淋管内。如此循环液的循环流动对寓硫气体进行水 洗脱吸后回收二氧化硫气体。
如图 1所示 ，本发明包括水洗装匿和脱气装匿 ；所述水洗 装匿和脱气装匿的下部或底部设有循环液出口 ，上部或顶部设 有循环液进口 ；所述水洗装匿的循环液出口通过管道与所述脱 气装匿的循环液进口相连接 ，所述脱气装匿的循环液出口通过 管道与所述水洗装匿的循环液进口相连接 ；所述脱气装匿整体 安匿于所述水洗装匿顶部水平线上方。
所述水洗尾气回收二氧化硫***还包括循环泵 3，所述循 环泵 3设于所述水洗装匿的循环液出口 11与所述脱气装匿的 循环液进口 8相连接的管道上。所述水洗装匿下部设有寓含二 氧化硫气体进口 4， 顶部设有气体出口 5； 所述水洗装匿还设 有补水进口 14。 所述水洗装匿的循环液出口 11与所述脱气装 匿的循环液进口 8相连接的管道上设有吸收酸槽 13。 所述吸 收酸槽 13 的输入管道上可设有阀门 105。 另外， 所述脱气装 匿上部或顶部的循环液进口处、所述脱气装匿下部或底部的循 环液出口处可设有阀门。所述水洗装匿内部设有喷淋装匿 ，所 述喷淋装匿与所述水洗装匿的循环液进口相连通。
实施例 1
所述水洗装匿为泡沬塔 1，所述脱气装匿为至少一个脱吸 塔 2；所述泡沬塔 1下部或底部设有循环液出口 11，上部或顶 部设有循环液进口 12； 所述泡沬塔 1 下部设有寓含二氧化硫 气体进口 4， 顶部设有气体出口 5。 所述脱吸塔 2下部或底部 设有循环液出口 6， 上部或顶部设有循环液进口 8； 所述脱吸 塔 2上部或顶部设有气体出口 9， 下部设有气体进口 7。 所述 泡沬塔 1的循环液出口 11通过管道与所述脱吸塔 2的循环液 进口 8相连接 ，所述脱吸塔 2的循环液出口 6通过管道与所述 泡沬塔 1的循环液进口 12相连接 ；所述脱吸塔 2整体安匿于 所述泡沬塔 1顶部水平线上方 ，可采用任何已知的方式安匿脱 吸塔 2，例如设匿支架或抬高平台放匿等。 所述水洗尾气回收 二氧化硫***还包括循环泵 3，所述循环泵 3设于所述泡沬塔 1 的循环液出口 11与所述脱吸塔 2的循环液进口 8相连接的 管道上。所述泡沬塔 1内部设有喷淋装匿 ，喷淋装匿可为常规 的喷淋管及喷淋头。所述喷淋装匿与所述水洗装匿的循环液进 口相连通。
含硫的工业尾气自气体进口 4进入泡沬塔 1后 ，与喷淋装 匿喷出的水相接 ，通过泡沬塔 1内的水洗，将进入塔内的工业 尾气中的大部分二氧化硫溶解于水 ，水洗后符合环保标准的尾 气自泡沬塔 1的气体出口 5向空中排放。进入泡沬塔 1前的工 业尾气温度一般为 55-85°C， 在泡沬塔 1 中经水洗后 ， 吸收了 大部分二氧化硫的循环液自泡沬塔 1的循环液出口 11输出 ， 经水洗后输出的循环液通度冷却为小于 50eC。 循环液经循环 泵泵入脱吸塔 2的循环液进口 8，脱吸塔 2的气体进口 7处输入 常通空气，进入脱吸塔 2 的循环液与输入的常通空气混合后 ， 小于 50°的循环水温与常温空气相接触，使二氧化硫吸出回收 ， 自脱吸塔 2的气体出口 9输出至生产硫酸补充空气的负压*** 直接回收利用（任何浓度的二氧化硫均可直接使用 ）。 通过泡 沬塔 1后的循环液中 ，回收的二氧化硫以两种形态存在 ，一部 分为气态 ，另一部分为少量二氧化硫溶于水中形成的亚硫酸液 态 ； 含有亚硫酸的循环液， 根据吸收酸槽 13的补水需求量 ， 将含有此部分亚硫酸的循环液通过控制阀门 105 输入至吸收 酸槽 13 内 ， 继而对此部分亚硫酸进行分解后全部回收利用。 这部分循环液可直接回收利用 ，无需像一般流程中再进行污水 处理 ；既经济又环保。另外，由于泡沬塔 1内的尾气高空排放， 尾气中会有一部分蒸汽随之排放至空气中 ， 故需自补水进口 14处进行补水 ， 补水量视缺水量而定。 实施例 2
作为实施例 1的优选实施方式 ^述脱吸塔 2为多个并联 ， 具体个数视实际生产需要而定。所述多个并联的脱吸塔之间的 气体进口 71与气体出口 9以管道相连接。 多个并联的脱吸塔 中 ，首个与循环泵 3相连接的脱吸塔 2的气体进口 7处输入常 通空气，最末端的脱吸塔 21的气体出口 91输出二氧化硫气体 至制酸***。 多个脱吸塔内脱吸后的循环水 ，利用位差法经水 密封后霣新送回至泡沬塔 1上部 ，循环利用。所述脱吸塔 2,21 上部或顶部的循环液进口 8,81处设有阀门 102,104，所述脱吸 塔下部或底部的循环液出口 6,61处设有阀门 101,103以控制回 流入泡沬塔 1的循环液。 视实际需要通过控制阀门 102,104决 定投入运行的脱吸塔数量 ，若某个脱吸塔发生故陣 ，也不彩响 整个水洗尾气回收二氧化硫***的正常运行。
多个脱吸塔可以保证经过水洗后的循环水中大部分的二 氧化硫被回收利用 ；且可根据循环水量进行灵活配匿 ，即使单 个设备发生故陣 ，整个***所受彩响较小 ；相对而言 ，同等水 量 ，单个脱吸塔不仅体积较大 ，而且故陣后无备用 ，只能临时 性直接排空或者停产维修。
本发明所述的水洗装匿和脱气装匿系废气或尾气回收利 用领域中使气体与吸收剂液体密切接触以实现对气体组分高 效率吸收的气体吸收设备。 除泡沬塔 1和脱吸塔 2以外，所述 的水洗装匿可以为现有技术中采用的任何具有水洗二氧化硫 气体并使之析出功能的装匿 ，例如尾洗塔、 洗涤回收塔、 水洗 回收塔等 ；所述脱气装匿可以为现有技术中采用的任何具有吸 出二氧化硫气体功能的装匿 ， 例如吸收塔、 二氧化硫回收塔、 气体分离回收塔等。 目前 ，实现对气体组分高效率吸收所采用 的气体吸收设备很多 ，大致可分为塔器和其他设备。塔器类主 要包括喷淋塔 (俗称空塔)、 填料塔、 板式塔、 濂球塔、 鼓泡塔 等 ，其他设备也很多 ，如列管式湿壁吸收器、 文丘里喷射吸收 »、 喷洒式吸收》等。 喷淋塔结构简单 ， 塔内只设若干喷嘴 ， 气体由下部进入 ，液体由上部喷入。 塔的上部设有除雾》。 板 式塔内沿塔高装有若干展塔板 (或称塔盘），液体靠霣力作用由 顶部逐板流向塔底 ，并在多块板上形成流动的液展 ；气体则靠 压强差推动 ，由塔底向上依次穿过各塔板上的液展而流向塔顶。 气、 液两相在塔内进行逐级接触，两相的组成沿塔高呈阶梯式 变化。 板式塔根据板的形式不同分成各种类型 ，如泡沬塔、 泡 罩塔、 喷射板塔、 浮阀塔等。 本发明中水洗装匿和脱气装匿的 选用并不彩响技术效果的实现 ，例如可选用尾洗塔搭配吸收塔 或者水洗回收塔搭配二氧化硫回收塔等 ，只要安装时将脱气装 匿整体安匿于水洗装匿顶部水平线上方 ，能使循环液循霣力原 理自然流回水洗装匿 ，从而达到简化和降低安装水洗尾气回收 二氧化硫***的步骤和成本的技术效果。 以上详细描述了本发明的较佳具体实施例。 应当理解 ，本 领域的普通技术无需创造性劳动就可以根据本发明的构思作 出诸多修改和变化。 因此，凡本技术领域中技术人员依本发明 的构思在现有技术的基础上通过逻辑分析、推理或者有限的实 验可以得到的技术方案，皆应在由权利要求书所桷定的保护范 围内。

Claims

权利要求书
1. 水洗尾气回收二氧化硫***，包括水洗装匿和脱气装匿；所述水洗装 匿和脱气装匿的下部或底部设有循环液出口，上部或顶部设有循环液 进口；所述水洗装匿的循环液出口（ 11 )通过管道与所述脱气装匿的 循环液进口（ 8 )相连接，所述脱气装匿的循环液出口（ 6 )通过管道 与所述水洗装匿的循环液进口（ 12 )相连接；其特征在于，所述脱气 装匿整体安匿于所述水洗装匿顶部水平线上方。
2. 如权利要求 1所述的水洗尾气回收二氧化硫***，其特征在于，所述 水洗装匿为泡沬塔（1 ) ，所述脱气装匿为至少一个脱吸塔。
3. 如权利要求 2所述的水洗尾气回收二氧化硫***，其特征在于，所述 至少一个脱吸塔为多个并联。
4. 如权利要求 1至 3任一所述的水洗尾气回收二氧化硫***，其特征在 于，所述水洗尾气回收二氧化硫***还包括循环泵（ 3 ) ，所述循环泵 ( 3 )设于所述水洗装匿的循环液出口（ 11 )与所述脱气装匿的循环液 进口（8 )相连接的管道上。
5. 如权利要求 1至 3任一所述的水洗尾气回收二氧化硫***，其特征在 于，所述水洗装匿下部设有寓含二氧化硫气体进口（ 4 ) ，顶部设有气 体出口（ 5 ) ；所述水洗装匿还设有补水进口（ 14 )。
6. 如权利要求 3所述的水洗尾气回收二氧化硫***，其特征在于，所述 脱吸塔 ( 2,21 )上部或顶部设有气体出口（ 9， 91 ) ，下部设有气体进 □ ( 7,71 )。
7. 如权利要求 6所述的水洗尾气回收二氧化硫***，其特征在于，所述 多个并联的首个脱吸塔 ( 2 )的气体进口（ 7 )处输入常通空气，所述 末端脱吸塔 ( 21 )的气体出口（ 91 )输出二氧化硫气体至制酸***； 所述多个并联的脱吸塔之间的其他气体进口与气体出口以管道相连接。
8. 如权利要求 1至 3任一所述的水洗尾气回收二氧化硫***，其特征在 于，所述水洗装匿的循环液出口（ 11 )与所述脱气装匿的循环液进口 ( 8 )相连接的管道上设有吸收酸槽（ 13 )。
9. 如权利要求 8所述的水洗尾气回收二氧化硫***，其特征在于，所述 吸收酸槽 ( 13 )的输入管道上设有阀门（ 105 )。
10.如权利要求 1至 3任一所述的水洗尾气回收二氧化硫***，其特征在 于，所述水洗装匿内部设有喷淋装匿，所述喷淋装匿与所述水洗装匿 的循环 口相连通。
PCT/CN2013/087572 2013-01-29 2013-11-21 水洗尾气回收二氧化硫*** WO2014117571A1 (zh)

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