CN108096997B - Absorption liquid for wet dust removal process in high-temperature plasma coal cracking acetylene preparation process and application - Google Patents
Absorption liquid for wet dust removal process in high-temperature plasma coal cracking acetylene preparation process and application Download PDFInfo
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- CN108096997B CN108096997B CN201711192590.2A CN201711192590A CN108096997B CN 108096997 B CN108096997 B CN 108096997B CN 201711192590 A CN201711192590 A CN 201711192590A CN 108096997 B CN108096997 B CN 108096997B
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- emulsifier
- flue gas
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- 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
- B01D53/1493—Selection of liquid materials for use as absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
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- 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
- B01D53/1487—Removing organic compounds
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- 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
- B01D2252/50—Combinations of absorbents
- B01D2252/504—Mixtures of two or more absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention discloses an absorption liquid applied to a wet dust removal process in a high-temperature plasma coal cracking acetylene preparation process, which is prepared by dispersing an emulsifier and a defoaming and foam inhibiting agent in water for compounding, wherein the emulsifier is one or two of sorbitol fatty acid ester and polyoxyethylene sorbitan fatty acid ester, and the defoaming and foam inhibiting agent is polydimethylsiloxane; the emulsifier accounts for 0.1-3 wt% of the total mass of the absorption liquid; the defoaming and foam inhibiting agent accounts for 0.1-2 wt% of the total mass of the absorption liquid. The invention improves the efficiency of dust removal and tar removal, reduces the dissolving loss of acetylene and improves the economy and reliability of the whole process.
Description
Technical Field
The invention relates to a wet dust removal process in a process for preparing acetylene by cracking coal through high-temperature plasma, in particular to absorption liquid in the wet dust removal process.
Background
China is a country rich in coal and less in oil, the dependence of oil on the outside is broken through by 60%, and the energy safety of China is seriously threatened. Therefore, the coal chemical industry is vigorously developed, and the generation of the basic chemical raw materials by utilizing the clean conversion and the high-value conversion of the coal resources has important practical significance and profound strategic significance. The existing acetylene industry by calcium carbide method needs to consume a large amount of electric energy and high-quality semi coke, and waste gas and dust are amplified side by side, so that the sustainable development of the acetylene industry is severely restricted. The technology for preparing acetylene by cracking coal by using plasma is considered to be an acetylene green production technology with great development prospect, is in accordance with the current energy situation of China, and is expected to replace a calcium carbide method to become a mainstream way for producing acetylene in China.
In the process of preparing acetylene by cracking coal with plasma, the cracking product generated after coal powder carried by hydrogen passes through a high-temperature plasma torch mainly takes hydrocarbon such as hydrogen, acetylene and the like as main materials and carries a large amount of small incompletely-reacted coal powder and a large amount of mixed substances of viscous substances such as tar and the like generated by coal through cracking reaction, in order to reduce the decomposition of acetylene, after the cracking gas comes out of a reactor, millisecond-level high-speed quenching is carried out, quenching water absorbs heat energy and is converted into a large amount of water vapor, and the water vapor is completely taken away by the cracking gas after the cracking gas passes through a quenching unit. It follows that the overall nature of the cleavage product is a complex mixture of highly explosive, dusty, finely divided solid particles, very high moisture and containing a large amount of coal tar and other sticky components. Wet dedusting processes may be a relatively better option in view of the need for safe and reliable removal of fine particulates and tars in the cracked gas in the subsequent acetylene and hydrogen separation process, while at the same time the product acetylene may face the problem of loss by dissolution in water. Therefore, how to develop a proper absorption liquid has important significance for improving the economy and reliability of the whole process by reducing the dissolving loss of acetylene while improving the dust removal and tar removal efficiency.
Disclosure of Invention
The invention provides an absorption liquid applied to a wet dust removal process in a high-temperature plasma coal cracking acetylene preparation process, which improves the efficiency of removing dust and tar and simultaneously reduces the dissolving loss of acetylene to improve the economy and reliability of the whole process.
An absorption liquid applied to a wet dust removal process in a high-temperature plasma coal cracking acetylene preparation process is prepared by dispersing an emulsifier and a defoaming foam inhibitor in water for compounding, wherein the emulsifier is one or two of sorbitol fatty acid ester and polyoxyethylene sorbitan fatty acid ester, and the defoaming foam inhibitor is polydimethylsiloxane; the emulsifier accounts for 0.1-3 wt% of the total mass of the absorption liquid; the defoaming and foam inhibiting agent accounts for 0.1-2 wt% of the total mass of the absorption liquid.
The emulsifier is selected by considering that the dissolution of acetylene is reduced while the emulsifying effect is improved, and the emulsifier is selected from a nonionic surfactant, so that the emulsifying effect is stronger.
Preferably, the emulsifier accounts for 0.5-1.5 wt% of the total mass of the absorption liquid; the defoaming and foam inhibiting agent accounts for 0.5-1.5 wt% of the total mass of the absorption liquid; further preferably, the emulsifier accounts for 0.8-1.2 wt% of the total mass of the absorption liquid; the defoaming and foam inhibiting agent accounts for the total mass ratio of the absorption liquid
0.8-1.2 wt%; most preferably, the emulsifier accounts for 1 wt% of the total mass of the absorption liquid; the defoaming and foam inhibiting agent accounts for 1 wt% of the total mass of the absorption liquid.
Preferably, the emulsifier is formed by compounding sorbitol fatty acid ester and polyoxyethylene sorbitan fatty acid ester, and the HLB value of the emulsifier is 3-10. Further preferably, the HLB value of the emulsifier is 7.5-9.5; further preferably, the HLB value of the emulsifier is 9-9.5; most preferably the emulsifier has an HLB value of 9.5.
Preferably, the sorbitol fatty acid ester is one or more of span80, span85 and span 20.
Preferably, the polyoxyethylene sorbitan fatty acid ester is tween 60.
Preferably, the viscosity of the polydimethylsiloxane is 300-1000 mPa & s; more preferably, the viscosity is 400 to 600 mPas; most preferably, the viscosity is 500 mPas.
Most preferably, the emulsifier is span20 and tween60, HLB is 9.5, and the emulsifier accounts for 1% of the total mass of the absorption liquid; the defoaming and foam inhibiting agent is polydimethylsiloxane, the viscosity of the polydimethylsiloxane is 500mPa & s, and the defoaming and foam inhibiting agent accounts for 1% of the total mass of the absorption liquid.
The invention also provides a wet dust removal method for the flue gas generated in the process of preparing acetylene by cracking coal through high-temperature plasma, which comprises the following steps:
(1) quenching flue gas generated in the process of preparing acetylene by cracking coal through high-temperature plasma, and then sending the flue gas to a cyclone dust collector for pre-dedusting, so that large particle dust larger than 5 microns is basically removed;
(2) sending the pre-dedusted flue gas into a jet bubble tower, accelerating the flue gas to be blown into absorption liquid in the tower through a jet pipe, and blowing a large amount of fine bubbles in the absorption liquid to ensure that the flue gas is in full contact with the absorption liquid, removing coal tar and dust, and cooling to below 100 ℃; the absorption liquid is the absorption liquid of the invention;
(3) then the flue gas is sent into a wet electric dust collector for fine dust removal, so that the dust content in the flue gas is less than or equal to 1mg/Nm3The flue gas after fine dust removal enters a subsequent gas separation section;
(4) and (3) sending the sewage generated in the steps (2) and (3) into a sewage treatment tank for treatment, and recycling the reclaimed water for a jet bubble tower and a wet electric dust collector.
Preferably, the temperature in the jet bubble column is 30-40 ℃, and the gas flow is 150-250 ml/min. Further preferably, the temperature in the sparging bubble column is 35 ℃ and the gas flow rate is 200 ml/min.
The absorption liquid is compounded by the specific emulsifier component and the defoaming and foam inhibiting agent, and has the following beneficial effects when being used for treating the flue gas generated in the process of preparing acetylene by cracking coal through high-temperature plasma:
(1) the absorption liquid has the advantages of wide raw material source, low price, simple preparation and no corrosion to equipment.
(2) The absorption liquid has good tar removal effect, the absorption amount is increased by more than 200% compared with water, the complete disappearance time of bubbles is reduced by 99%, and the absorption of tar can be obviously improved.
(3) The dissolving rate of the absorption liquid to acetylene is about 90 percent of that of water, so that the acetylene dissolving loss is reduced, the economic benefit is improved, and the absorption amount of acetylene can be obviously reduced.
Detailed Description
The present invention is further illustrated by the following examples. It is to be understood that the following examples are illustrative only and are not intended to limit the scope of the present invention.
Example 1
0.84g of span80 and 1.16g of tween60 are taken and compounded to obtain an HLB (hydrophile-lipophile balance) 8.6 emulsifier, 2g of polydimethylsiloxane with the viscosity of 500mPa & s are added, and the mixture and water are fully mixed to obtain 200g of absorption liquid.
200g of the prepared liquid is placed in a small-sized jet bubbling reactor to carry out acetylene absorption and coal tar absorption tests, and under the conditions that the temperature is 35 ℃, the gas flow is 200ml/min, the acetylene concentration is 7 percent, and the dust removal efficiency is 90 percent, compared with the water absorption, the acetylene absorption amount is reduced to 90 percent, the tar absorption amount is increased to 265 percent, and the complete bubble disappearance time is reduced to 99 percent.
Example 2
0.91g of span85 and 1.09g of tween60 are taken and compounded to obtain an HLB (hydrophile-lipophile balance) 8.6 emulsifier, 2g of polydimethylsiloxane with the viscosity of 500mPa & s are added, and the mixture and water are fully mixed to obtain 200g of absorption liquid.
200g of the prepared liquid is placed in a small-sized jet bubbling reactor to carry out acetylene absorption and coal tar absorption tests, and under the conditions that the temperature is 35 ℃, the gas flow is 200ml/min, the acetylene concentration is 7 percent, and the dust removal efficiency is 90 percent, compared with the water absorption, the acetylene absorption amount is reduced to 92 percent, the tar absorption amount is increased to 260 percent, and the complete bubble disappearance time is reduced to 99 percent.
Example 3
1.26g of span80 and 1.74g of tween60 are taken and compounded to obtain an HLB (hydrophile-lipophile balance) 8.6 emulsifier, 2g of polydimethylsiloxane with the viscosity of 500mPa & s are added, and the mixture and water are fully mixed to obtain 200g of absorption liquid.
200g of the prepared liquid is placed in a small-sized jet bubbling reactor to carry out acetylene absorption and coal tar absorption tests, and under the conditions that the temperature is 35 ℃, the gas flow is 200ml/min, the acetylene concentration is 7 percent, and the dust removal efficiency is 90 percent, compared with the water absorption, the acetylene absorption amount is reduced to 87 percent, the tar absorption amount is increased to 275 percent, and the complete bubble disappearance time is reduced to 99 percent.
Example 4
1.38g of span80 and 0.62g of tween60 are taken and compounded to obtain an emulsifier with HLB being 7.5, and then 2g of polydimethylsiloxane with viscosity of 500mPa & s is added and fully mixed with water to obtain 200g of absorption liquid.
200g of the prepared liquid is placed in a small-sized jet bubbling reactor to carry out acetylene absorption and coal tar absorption tests, and under the conditions that the temperature is 35 ℃, the gas flow is 200ml/min, the acetylene concentration is 7 percent, and the dust removal efficiency is 90 percent, compared with the water absorption, the acetylene absorption amount is reduced to 98 percent, the tar absorption amount is increased by 252 percent, and the complete bubble disappearance time is reduced by 99 percent.
Example 5
1.70g of span20 and 0.30g of tween60 are taken and compounded to obtain an HLB (hydrophile-lipophile balance) 9.5 emulsifier, 2g of polydimethylsiloxane with the viscosity of 500mPa & s are added, and the mixture and water are fully mixed to obtain 200g of absorption liquid.
200g of the prepared liquid is placed in a small-sized jet bubbling reactor to carry out acetylene absorption and coal tar absorption tests, and under the conditions that the temperature is 35 ℃, the gas flow is 200ml/min, the acetylene concentration is 7 percent, and the dust removal efficiency is 90 percent, compared with the water absorption, the acetylene absorption amount is reduced to 98 percent, the tar absorption amount is increased by 273 percent, and the complete bubble disappearance time is reduced by 99 percent.
Example 6
0.42g of span80 and 0.58g of tween60 are taken and compounded to obtain an HLB (hydrophile-lipophile balance) 8.6 emulsifier, 2g of polydimethylsiloxane with the viscosity of 500mPa & s are added, and the mixture and water are fully mixed to obtain 200g of absorption liquid.
200g of the prepared liquid is placed in a small-sized jet bubbling reactor to carry out acetylene absorption and coal tar absorption tests, and under the conditions that the temperature is 35 ℃, the gas flow is 200ml/min, the acetylene concentration is 7 percent, and the dust removal efficiency is 90 percent, compared with the water absorption, the acetylene absorption amount is reduced to 93 percent, the tar absorption amount is increased to 198 percent, and the complete bubble disappearance time is reduced to 99 percent.
Example 7
0.84g of span80 and 1.16g of tween60 are taken and compounded to obtain an emulsifier with HLB being 8.6, 1g of polydimethylsiloxane with viscosity of 500mPa & s is added, and the mixture and water are fully mixed to obtain 200g of absorption liquid.
200g of the prepared liquid is placed in a small-sized jet bubbling reactor to carry out acetylene absorption and coal tar absorption tests, and under the conditions that the temperature is 35 ℃, the gas flow is 200ml/min, the acetylene concentration is 7 percent, and the dust removal efficiency is 90 percent, compared with the water absorption, the acetylene absorption amount is reduced to 90 percent, the tar absorption amount is increased by 263 percent, and the complete disappearance time of bubbles is reduced by 96 percent.
Example 8
0.84g of span80 and 1.16g of tween60 are taken and compounded to obtain an emulsifier with HLB being 8.6, 1g of polydimethylsiloxane with viscosity of 1000mPa & s is added, and the mixture and water are fully mixed to obtain 200g of absorption liquid.
200g of the prepared liquid is placed in a small-sized jet bubbling reactor to carry out acetylene absorption and coal tar absorption tests, and under the conditions that the temperature is 35 ℃, the gas flow is 200ml/min, the acetylene concentration is 7 percent, and the dust removal efficiency is 90 percent, compared with the water absorption, the acetylene absorption amount is reduced to 90 percent, the tar absorption amount is increased by 263 percent, and the complete bubble disappearance time is reduced by 98 percent.
Example 9
0.84g of span80 and 1.16g of tween60 are taken and compounded to obtain an emulsifier with HLB being 8.6, 1g of polydimethylsiloxane with viscosity of 300mPa & s is added, and the mixture and water are fully mixed to obtain 200g of absorption liquid.
200g of the prepared liquid is placed in a small-sized jet bubbling reactor to carry out acetylene absorption and coal tar absorption tests, and under the conditions that the temperature is 35 ℃, the gas flow is 200ml/min, the acetylene concentration is 7 percent, and the dust removal efficiency is 90 percent, compared with the water absorption, the acetylene absorption amount is reduced to 90 percent, the tar absorption amount is increased to 264 percent, and the complete bubble disappearance time is reduced to 95 percent.
The above description is only an embodiment of the present invention, but the technical features of the present invention are not limited thereto, and any person skilled in the relevant art can change or modify the present invention within the scope of the present invention.
Claims (6)
1. A wet dust removal method for flue gas generated in a process of preparing acetylene by cracking coal through high-temperature plasma is characterized by comprising the following steps:
(1) quenching flue gas generated in the process of preparing acetylene by cracking coal through high-temperature plasma, and then sending the flue gas to a cyclone dust collector for pre-dedusting, so that large particle dust larger than 5 microns is basically removed;
(2) sending the pre-dedusted flue gas into a jet bubble tower, accelerating the flue gas to be blown into absorption liquid in the tower through a jet pipe, and blowing a large amount of fine bubbles in the absorption liquid to ensure that the flue gas is in full contact with the absorption liquid, removing coal tar and dust, and cooling to below 100 ℃;
(3) then the flue gas is sent into a wet electric dust collector for fine dust removal, so that the dust content in the flue gas is less than or equal to 1mg/Nm3The flue gas after fine dust removal enters a subsequent gas separation section;
(4) sending the sewage generated in the steps (2) and (3) into a sewage treatment tank for treatment, and then reusing the reclaimed water in a jet bubble tower and a wet electric dust collector;
the absorption liquid is formed by dispersing an emulsifier and a defoaming and foam inhibiting agent in water and compounding, wherein the emulsifier is one or two of sorbitol fatty acid ester and polyoxyethylene sorbitan fatty acid ester, and the defoaming and foam inhibiting agent is polydimethylsiloxane; the emulsifier accounts for 0.1-3% of the total mass of the absorption liquid; the defoaming and foam inhibiting agent accounts for 0.1-2% of the total mass of the absorption liquid.
2. The method according to claim 1, wherein the emulsifier is prepared by compounding a sorbitol fatty acid ester and a polyoxyethylene sorbitan fatty acid ester, and the HLB value of the emulsifier is 3-10.
3. The process of claim 1 or 2, wherein the sorbitol fatty acid ester is one or more of span80, span85, and span 20.
4. The process according to claim 1 or 2, wherein the polyoxyethylene sorbitan fatty acid ester is tween 60.
5. The method according to claim 1, wherein the polydimethylsiloxane has a viscosity of 300 to 1000 mPa-s.
6. The method according to claim 1, wherein the temperature in the sparging bubble column is 30 to 40 ℃ and the gas flow rate is 150 to 250 ml/min.
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| TW589369B (en) * | 2001-07-11 | 2004-06-01 | Kune-Muh Tsai | Emulsion fuel oil additive |
| CN101259360A (en) * | 2007-12-17 | 2008-09-10 | 昆明理工大学 | Purifying method of waste gases containing benzenes compounds |
| CN102133802B (en) * | 2010-01-21 | 2013-08-14 | 中国科学院化学研究所 | Flaky material with front and back surfaces having different properties and preparation method thereof |
| CN102336627A (en) * | 2011-06-29 | 2012-02-01 | 新疆天业（集团）有限公司 | Process for cracking coal hydrogen mixture by using plasma to form quenching medium |
| GB201115079D0 (en) * | 2011-08-31 | 2011-10-19 | Iota Nanosolutions Ltd | Method of preparing carrier liquids |
| CN103084173B (en) * | 2011-10-28 | 2017-04-26 | 中国石油化工股份有限公司 | C4 fraction selective hydrogenation catalyst, preparation method and applications thereof |
| US9708562B2 (en) * | 2012-02-10 | 2017-07-18 | Soane Energy, Llc | Rapidly inverting water-in-oil polymer emulsions |
| CN103252155B (en) * | 2013-05-21 | 2015-06-03 | 许征 | Device for treating organic waste gas with oil-in-water emulsion and method for treating organic waste gas |
| CN103537171B (en) * | 2013-10-30 | 2016-04-06 | 许征 | A kind of method of emulsion, the device administering organic exhaust gas and the improvement organic exhaust gas for administering organic exhaust gas |
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