CN109663387B - Degassing and deodorizing method for carbon black water of acetylene device - Google Patents
Degassing and deodorizing method for carbon black water of acetylene device Download PDFInfo
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- CN109663387B CN109663387B CN201710957711.1A CN201710957711A CN109663387B CN 109663387 B CN109663387 B CN 109663387B CN 201710957711 A CN201710957711 A CN 201710957711A CN 109663387 B CN109663387 B CN 109663387B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0042—Degasification of liquids modifying the liquid flow
- B01D19/0047—Atomizing, spraying, trickling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0005—Degasification of liquids with one or more auxiliary substances
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/72—Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/702—Hydrocarbons
- B01D2257/7022—Aliphatic hydrocarbons
Abstract
The invention discloses a degassing and deodorizing method for carbon black water of an acetylene device. The method comprises the following steps: (1) pressurizing carbon black water to be treated, then spraying the carbon black water in the middle upper part of a stripping tower, and enabling stripping gas to enter the stripping tower from the middle lower part of the stripping tower; the gas stripping gas is the stripping tail gas from the stripping section; (2) carbon black water recycled in the acetylene device enters a water spraying section at the top of the stripping tower, and stripped gas enters a vacuum pump from the top of the stripping tower and is sucked into the middle lower part of the tank after being sprayed and cooled by the carbon black water; (3) carbon black water is sucked into the upper part of the tank from the vacuum pump and is sprayed down, and the gas stripping gas exhausted from the top of the gas stripping tower is further cooled in the tank; the stripping gas discharged from the top of the tank is pumped to a cracking gas main pipe by a vacuum pump; (4) carbon black water discharged from the bottom of a vacuum pump suction tank is introduced into a tower kettle of the stripping tower, and is pressurized together with the carbon black water degassed by the tower kettle and then sent into a subsequent carbon black water tank for further treatment. The invention improves the degassing effect on the carbon black water of the acetylene device and solves the environmental protection problem.
Description
Technical Field
The invention relates to the technical field of natural gas, in particular to a degassing and deodorizing method for carbon black water of an acetylene device.
Background
In the process of preparing acetylene by partial oxidation of natural gas, the main reaction in an acetylene furnace is the decomposition of natural gas to generate acetylene and hydrogen, the reaction needs to be completed in a very short time, and the acetylene generated in a long time can be continuously decomposed into carbon black and hydrogen. In order to effectively control the reaction time, the reaction is stopped in time when the acetylene reaches the highest yield by adopting a water spraying quenching mode, and carbon black in the pyrolysis gas is partially washed by spraying water to form carbon black water. While natural gas is decomposed, other side reactions occur in the acetylene furnace, and the generated by-products include carbon monoxide, carbon dioxide, hydrogen, higher alkynes, etc., and these components and acetylene are dissolved in a small amount in the carbon black water. Before the carbon black water is sent to a carbon black water tank from an acetylene furnace for treatment, the pyrolysis gas components dissolved in the carbon black water need to be removed as much as possible, otherwise, the dissolved gas in the water enters a subsequent carbon black water treatment section to cause environmental pollution and bring potential safety hazards.
The acetylene content in the acetylene furnace cracked gas is not high, the acetylene is required to be recovered from the mixed gas through concentration, and in the concentration section, the mixed gas is separated into three fractions, namely, a product acetylene, high-grade acetylene and concentrated tail gas, wherein the concentrated tail gas mainly comprises gases such as hydrogen, carbon monoxide and the like. The patent (publication No. CN102241421A) provides a method for removing dissolved gas in carbon black water, which adopts concentrated tail gas as stripping gas to remove gases such as acetylene dissolved in carbon black water in a degassing tank.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a degassing and deodorizing method for carbon black water of an acetylene device. The degassing process is improved, the degassing effect of the acetylene device carbon black water is improved, and the environmental protection problem is solved.
In order to realize the purpose, the invention adopts the technical scheme that: a method for degassing and deodorizing carbon black water of an acetylene device is characterized in that a gas stripping gas is adopted to degas the carbon black water in a negative pressure stripping tower; the gas stripping gas is the stripping tail gas from the device stripping section, the gas stripping tower is a packed tower, and carbon black water spray section cooling gas stripping gas is respectively arranged on the tower top and the suction tank top of a vacuum pump connected with the tower.
The invention aims to provide a method for degassing and deodorizing carbon black water of an acetylene device.
The method comprises the following steps:
(1) pressurizing carbon black water to be treated, then spraying the carbon black water in the middle upper part of a stripping tower, and enabling stripping gas to enter the stripping tower from the middle lower part of the stripping tower;
the gas stripping gas is the stripping tail gas from a stripping section;
(2) carbon black water recycled in the acetylene device enters a water spraying section at the top of the stripping tower, and after being sprayed and cooled, the stripped carbon black water enters a vacuum pump from the top of the stripping tower and is sucked into the middle lower part of the tank
(3) Spraying carbon black water at 35 ℃ from the upper part of a vacuum pump suction tank, and further cooling the extracted gas stripping gas exhausted from the top of the gas stripping tower in the tank; the stripping gas discharged from the top of the tank is pumped to a cracking gas main pipe by a vacuum pump;
(4) carbon black water discharged from the bottom of a vacuum pump suction tank is introduced into a tower kettle of the stripping tower, and is pressurized together with the carbon black water degassed by the tower kettle and then sent into a subsequent carbon black water tank for further treatment.
Among them, preferred are:
the mass flow ratio of the stripping gas to the carbon black water to be treated in the step (1) is 1: (900-1000).
The mass flow ratio of the carbon black water sprayed on the top of the tower and the stripping gas in the step (2) is (110-120): 1.
the mass flow ratio of the carbon black water sprayed on the top of the tank and the stripping gas in the step (3) is (9-11): 1.
the operating pressure of the stripping tower is-0.055 MPa to-0.040 MPa.
The gas stripping temperature at the top of the gas stripping tower is not lower than 45 ℃.
The invention can adopt the following technical scheme:
the method comprises the following specific steps:
the method comprises the following steps: carbon black water to be treated from an acetylene furnace enters the middle upper part of a stripping tower for spraying after being pressurized by a carbon black water pump, stripping gas (concentrated tail gas from a concentration working section) enters the tower from the middle lower part of the stripping tower, and the introduction of the stripping gas reduces the partial pressure of organic hydrocarbons such as acetylene and the like in the carbon black water to be treated, so that the organic hydrocarbons are extracted from the carbon black water to be treated.
Step two: carbon black water with the temperature of 35 ℃ which is recycled in the acetylene device enters a water spraying section at the top of the stripping tower, and stripped gas enters a vacuum pump from the top of the stripping tower to be sucked into the middle lower part of the tank after being sprayed and cooled by the carbon black water with the temperature of 35 ℃.
Step three: spraying carbon black water at 35 ℃ from the upper part of a vacuum pump suction tank, and further cooling the extracted gas stripping gas exhausted from the top of the gas stripping tower in the tank; the vacuum pump suction tank is connected with the vacuum pump, the stripping gas discharged from the top of the tank is pumped to the cracking gas main pipe by the vacuum pump, and the operation pressure of the stripping tower is controlled according to the stripping gas main pipe.
Step four: carbon black water discharged from the bottom of a vacuum pump suction tank is introduced into a tower kettle of the stripping tower, and is pressurized by a carbon black water booster pump together with carbon black water degassed by the tower kettle, and then is sent into a subsequent carbon black water tank for further treatment.
Preferably, the mass flow ratio of the stripping gas to the carbon black water to be treated in the step one is 1: (900-1000).
Preferably, the mass flow ratio of the carbon black water at 35 ℃ sprayed on the top of the tower and the stripping gas in the second step is (110-120): 1.
preferably, the mass flow ratio of the carbon black water at 35 ℃ sprayed on the top of the tank in the third step to the stripping gas is (9-11): 1; the operating pressure of the stripping tower is controlled to be-0.055 MPa to-0.040 MPa (gauge pressure) by pumping air through a vacuum pump.
The gas stripping temperature of the cooled tower top is controlled to be not lower than 45 ℃ by adjusting the using amount of carbon black water sprayed from the tower top.
The invention has the following beneficial effects:
(1) according to the invention, the concentrated tail gas generated in the concentrating section of the device is selected as the gas stripping gas, and the stripped concentrated tail gas can be directly sent to the cracking gas main pipe without additionally increasing subsequent treatment flows, so that the influence on the whole process is small, and the operation cost is saved.
(2) The gas stripping process is carried out in the packed tower, the stripping gas can be fully contacted with the carbon black water, the stripping tower adopts negative pressure operation, the removal of the pyrolysis gas in the carbon black water is facilitated, the diacetylene removal effect is remarkably improved, a good degassing effect is obtained, the requirements of related environmental protection standards can be met by using a small amount of stripping gas, the concentration tail gas generated by the device can meet the requirements of the using amount of the stripping gas, and other stripping gases do not need to be supplemented additionally.
(3) The method adopts a direct spraying mode of carbon black water sucked into the top of the gas stripping tower and the top of the vacuum pump to cool the gas stripping, and reduces the saturated water content in the gas phase at the top of the tower through temperature reduction on the premise of ensuring higher degassing rate, thereby reducing the suction capacity of the vacuum pump, reducing the power of the vacuum pump and avoiding overhigh temperature at the outlet of the vacuum pump; the spray water utilizes the carbon black water with the temperature of 35 ℃ recycled by the device, no additional circulating water is needed, and compared with an indirect cooling method (cooling the gas at the top of the tower by a circulating water cooler), the direct spray method has the advantages of low spray water consumption and low energy consumption.
Drawings
Fig. 1 is a process diagram of a method for degassing and deodorizing carbon black water according to an embodiment of the present invention.
FIG. 2 is a schematic process diagram of a method for degassing and deodorizing carbon black water according to a comparative example of the present invention.
Description of reference numerals:
1: carbon black water to be treated; 2: a carbon black water pump; 3: a stripper column; 4: stripping gas (tail gas from the concentration section); 5: spraying carbon black water at 35 ℃ on the tower top; 6: stripping gas after stripping; 7: a vacuum pump suction canister; 8: discharging stripping gas from the top of the tank; 9: a vacuum pump; 10: spraying carbon black water with the temperature of 35 ℃ on the top of the tank; 11: discharging carbon black water from the tank bottom; 12: a carbon black water booster pump; 13: and (4) carbon black water degassed at the tower bottom.
Detailed Description
The present invention will be further described with reference to the following examples.
Examples
One embodiment of the present invention is explained below with reference to fig. 1.
The property and composition of the carbon black water to be treated of the acetylene device are as follows: the temperature is 78 ℃, the pressure is 0.005MPa (gauge pressure), the flow is 300t/h, the carbon black content is 0.2g/L, and the total content of pyrolysis gas is 0.0034 wt%, wherein the components with higher content (>0.0001 wt%) comprise three components, namely carbon monoxide (0.00027 wt%), acetylene (0.00254 wt%) and diacetylene (0.00037 wt%), and the unit wt% refers to mass percentage.
The property and composition of the concentrated tail gas 4 from the concentration section of the acetylene device are as follows: the temperature is 15 ℃, the pressure is 0.09MPa (gauge pressure), the components with higher content (>4 v%) are three components of hydrogen (61.68 v%), carbon monoxide (27.18 v%) and methane (4.91 v%), in addition, the components also contain small amount of acetylene (0.04 v%), and the unit v% refers to volume percentage.
As shown in FIG. 1, the degassing and deodorizing of the carbon black water 1 to be treated comprises the following steps:
the method comprises the following steps: carbon black water 1 to be treated from an acetylene furnace enters a stripping tower 3 from the middle upper part for spraying after being pressurized by a carbon black water pump 2, stripping gas (concentrated tail gas from a concentration working section) 4 is decompressed to 0.005MPa (gauge pressure) by a pressure reducing valve and then enters the stripping tower 3 from the middle lower part thereof, the mass flow rate is 0.321t/h, and the volume flow rate is 600Nm3In Nm,/h3The/h is standard cubic meter per hour, and the introduction of the stripping gas 4 reduces the partial pressure of organic hydrocarbons such as acetylene and the like in the carbon black water 1 to be treated, so that the organic hydrocarbons are stripped from the carbon black water 1 to be treated.
Step two: carbon black water 5 with the temperature of 35 ℃ which is recycled in the acetylene device enters a water spraying section at the top of the stripping tower 3, the flow rate is 36.2t/h, stripping gas 6 after stripping is sprayed and cooled to 45 ℃ by the carbon black water 5 with the temperature of 35 ℃, and enters the middle lower part of a vacuum pump suction tank 7 from the top of the stripping tower 3.
Step three: spraying 35 ℃ carbon black water 10 with the flow of 3.0t/h from the upper part of a vacuum pump suction tank 7, and further cooling the stripped gas 6 (with the mass flow of 0.446t/h) discharged from the top of the stripping tower 3 to 40 ℃ in the tank; the vacuum pump suction tank 7 is connected with a vacuum pump 9, the stripping gas 8 discharged from the top of the tank is sent to a cracking gas main pipe by the vacuum pump 9, and the operating pressure of the stripping tower 3 is controlled to be-0.050 MPa (gauge pressure).
Step four: carbon black water 11 discharged from the bottom of a vacuum pump suction tank 7 is introduced into a tower kettle of an air stripping tower 3, is pressurized by a carbon black water booster pump 12 together with carbon black water degassed from the tower kettle, and is sent to a subsequent carbon black water tank for further treatment.
The carbon black water degassed by the steps has the acetylene removal rate of 99.87 percent and the diacetylene removal rate of 90.38 percent, and can meet the requirement of environmental protection and discharge. The temperature of stripping gas at the outlet of the vacuum pump is 119 ℃, and the temperature of carbon black water at the outlet of the carbon black water booster pump is 73 ℃.
Comparative example
A comparative embodiment of the present invention is explained below with reference to fig. 2.
The property and composition of the carbon black water to be treated of the acetylene device are as follows: the temperature is 78 ℃, the pressure is 0.005MPa (gauge pressure), the flow is 300t/h, the carbon black content is 0.2g/L, and the total content of pyrolysis gas is 0.0034 wt%, wherein the components with higher content (>0.0001 wt%) comprise three components, namely carbon monoxide (0.00027 wt%), acetylene (0.00254 wt%) and diacetylene (0.00037 wt%).
The property and composition of the concentrated tail gas 4 from the concentration section of the acetylene device are as follows: the temperature is 15 ℃, the pressure is 0.09MPa (gauge pressure), the components with higher content (>4 v%) are three types, namely hydrogen (61.68 v%), carbon monoxide (27.18 v%) and methane (4.91 v%), and in addition, the components comprise a small amount of acetylene (0.04 v%).
As shown in FIG. 2, the degassing and deodorizing of the carbon black water 1 to be treated is carried out by the following steps:
the method comprises the following steps: carbon black water 1 to be treated from an acetylene furnace enters a stripping tower 3 to be sprayed from the middle upper part after being pressurized by a carbon black water pump 2, stripping gas (concentrated tail gas from a concentration working section) 4 is decompressed to 0.02MPa (gauge pressure) by a pressure reducing valve and then enters the stripping tower 3 from the middle lower part thereof, and the volume flow rate is 600Nm & lt/EN & gt3And h, introducing a stripping gas 4 to reduce the partial pressure of organic hydrocarbons such as acetylene in the carbon black water 1 to be treated, so that the organic hydrocarbons are stripped from the carbon black water 1 to be treated, and the operating pressure of the stripper tower 3 is 0.009MPa (gauge pressure).
Step two: and (4) discharging the stripped gas 6 from the top of the stripping tower 3 and conveying the gas to a cracking gas main pipe.
Step three: sending the carbon black water 13 degassed by the tower kettle into a subsequent carbon black water tank by a potential difference for further treatment.
The carbon black water degassed by the steps has the acetylene removal rate of 99.51% and the diacetylene removal rate of 27.97%.
As can be seen from the data of the examples and the comparative examples, the removal rate of the diacetylene in the examples of the invention can reach 90.38%, which is far higher than that in the comparative examples, and the diacetylene completely meets the requirement of environmental protection.
Claims (4)
1. A degassing and deodorizing method for acetylene unit carbon black water is characterized by comprising the following steps:
(1) pressurizing carbon black water to be treated, then spraying the carbon black water in the middle upper part of a stripping tower, and enabling stripping gas to enter the stripping tower from the middle lower part of the stripping tower;
the gas stripping gas is the stripping tail gas from a stripping section;
(2) carbon black water at 35 ℃ recycled in the acetylene device enters a water spraying section at the top of the stripping tower, and stripped gas enters a vacuum pump from the top of the stripping tower to be sucked into the middle lower part of the tank after being sprayed and cooled by the carbon black water;
(3) spraying carbon black water at 35 ℃ from the upper part of a vacuum pump suction tank, and further cooling the extracted gas stripping gas exhausted from the top of the gas stripping tower in the tank; the stripping gas discharged from the top of the tank is pumped to a cracking gas main pipe by a vacuum pump;
the gas stripping temperature at the top of the gas stripping tower is not lower than 45 ℃;
the operating pressure of the air stripping tower is-0.055 to-0.040 MPa;
(4) carbon black water discharged from the bottom of a vacuum pump suction tank is introduced into a tower kettle of the stripping tower, and is pressurized together with the carbon black water degassed by the tower kettle and then sent into a subsequent carbon black water tank for further treatment.
2. The method for degassing and deodorizing carbon black water of an acetylene unit according to claim 1, characterized in that:
the mass flow ratio of the stripping gas to the carbon black water to be treated in the step (1) is 1: (900-1000).
3. The method for degassing and deodorizing carbon black water of an acetylene unit according to claim 2, characterized in that:
the mass flow ratio of the carbon black water sprayed on the top of the tower and the stripping gas in the step (2) is (110-120): 1.
4. the method for degassing and deodorizing carbon black water of an acetylene unit according to claim 3, characterized in that:
the mass flow ratio of the carbon black water sprayed on the top of the tank and the stripping gas in the step (3) is (9-11): 1.
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| CN201710957711.1A CN109663387B (en) | 2017-10-16 | 2017-10-16 | Degassing and deodorizing method for carbon black water of acetylene device |
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| CN201710957711.1A CN109663387B (en) | 2017-10-16 | 2017-10-16 | Degassing and deodorizing method for carbon black water of acetylene device |
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| CN109663387B true CN109663387B (en) | 2021-08-03 |
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| CN114405427A (en) * | 2022-01-11 | 2022-04-29 | 四川艾普热能科技有限公司 | Low-energy-consumption cracking device and method for preparing acetylene from natural gas |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1485190A1 (en) * | 2002-03-12 | 2004-12-15 | Basf Aktiengesellschaft | Method for deacidifying a fluid stream and washing liquid used in such a method |
| CN102241421A (en) * | 2010-05-14 | 2011-11-16 | 中国石油化工集团公司 | Method for removing dissolved gases from carbon black water |
| CN103342399A (en) * | 2013-08-01 | 2013-10-09 | 新疆中泰化学股份有限公司 | Stripping system and stripping method for cleaning waste sodium hypochlorite in production of acetylene by virtue of calcium carbide method |
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2017
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1485190A1 (en) * | 2002-03-12 | 2004-12-15 | Basf Aktiengesellschaft | Method for deacidifying a fluid stream and washing liquid used in such a method |
| CN102241421A (en) * | 2010-05-14 | 2011-11-16 | 中国石油化工集团公司 | Method for removing dissolved gases from carbon black water |
| CN103342399A (en) * | 2013-08-01 | 2013-10-09 | 新疆中泰化学股份有限公司 | Stripping system and stripping method for cleaning waste sodium hypochlorite in production of acetylene by virtue of calcium carbide method |
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