CN113086991A - Oil-containing ammonia gas oil removal process - Google Patents
Oil-containing ammonia gas oil removal process Download PDFInfo
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- CN113086991A CN113086991A CN202110548123.9A CN202110548123A CN113086991A CN 113086991 A CN113086991 A CN 113086991A CN 202110548123 A CN202110548123 A CN 202110548123A CN 113086991 A CN113086991 A CN 113086991A
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- ammonia
- gas
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- oil
- ammonia gas
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/10—Separation of ammonia from ammonia liquors, e.g. gas liquors
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/022—Preparation of aqueous ammonia solutions, i.e. ammonia water
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/024—Purification
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
Abstract
The invention relates to a process for removing oil from oil-containing ammonia gas, which comprises the following steps: the water quality of the raw material water containing oil ammonia gas to be treated after passing through a gas-water separation device is firstly treated by removing acid gas through an acid removal tower, and the removed acid gas is sent to a torch for combustion through an acid gas pipeline; the crude ammonia gas resolved from the top of the deamination tower is sent to an ammonia purification tower for washing; the washing water in the ammonia purification tower is desalted water, so that the oil removal effect is improved; sending the washed ammonia gas to an alkaline washing settling tank for alkaline washing to remove impurities such as phenol, oil and sulfur-containing compounds in the ammonia gas; and the ammonia gas after impurity removal returns to the ammonia gas absorption cooler to produce dilute ammonia water, and the dilute ammonia water enters the ammonia water tank and is then pumped to the flue gas desulfurization device by the dilute ammonia water pump. The process provided by the invention effectively reduces the ammonia water oil content in the oily ammonia gas, reduces the ammonia content in the phenol water, reduces the consumption of an extracting agent (diisopropyl ether), reduces the consumption of diisopropyl ether by about 5t per month, and greatly saves the cost.
Description
Technical Field
The invention belongs to the technical field of ammonia oil removal, and particularly relates to a process for removing oil from oil-containing ammonia gas.
Background
In the existing lurgi furnace crushed coal pressure gasification process, raw material water from a gas water separation device is firstly subjected to acid gas removal treatment through an acid removal tower, then the acid removal water is sent to a deamination tower for deamination treatment, crude ammonia gas resolved from the top of the deamination tower is cooled through an ammonia two-stage condensation cooler, and the ammonia gas after gas-liquid separation through a liquid separation tank is subjected to cooling, absorption, alkali washing and adsorption in an ammonia refining device to remove impurities such as phenol, oil, sulfur-containing compounds and the like in the ammonia gas. The ammonia gas after removing impurities returns to an ammonia gas absorption cooler to produce dilute ammonia water, the dilute ammonia water enters an ammonia water tank and is then pumped to a flue gas desulfurization device by a dilute ammonia water pump, but the ammonia gas obtained in the process has higher oil content.
The ammonia gas and ammonia water can be used as laboratory application, military application, industrial application, medical application, agricultural application, detergent, neutralizer and alkaloid leaching agent, and also can be used in pharmaceutical industry, gauze mask industry, blueprint and the like. Therefore, the purity of ammonia gas and ammonia water is very important for the production of downstream products, the oil content in the residual ammonia water directly influences the dephenolization efficiency of the solvent and the consumption of the solvent, the oil content in the dephenolized ammonia water directly influences the treatment effect of the deamination tower, and can block a bubble cap of the deamination tower to reduce the heat exchange effect of an ammonia water heater when the oil content is serious, so that the ammonia gas/water oil removal is particularly important in the whole coking wastewater treatment process.
Disclosure of Invention
Technical problem to be solved
In order to solve the problems in the prior art, the invention provides a process for removing oil from oil-containing ammonia gas, which can effectively reduce the oil content in the ammonia gas.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
a process for removing oil from oil-containing ammonia gas comprises the following steps:
s1, treating raw material water containing oil ammonia gas to be treated by a gas-water separation device, removing acid gas from the treated gas water by an acid removal tower, and delivering the removed acid gas to a torch for combustion by an acid gas pipeline;
s2, performing deamination treatment on the deacidified water obtained by the deacidification tower in a deamination tower;
s3, cooling the crude ammonia gas desorbed from the top of the deamination tower by an ammonia gas two-stage condensation cooler, and sending the ammonia gas subjected to gas-liquid separation by a liquid separation tank to an ammonia purification tower for washing;
s4, washing water in the ammonia purification tower is desalted water, so that the oil removal effect is improved;
s5, sending the washed ammonia gas to an alkaline washing settling tank for alkaline washing to remove the impurities of phenol, oil and sulfur-containing compounds in the ammonia gas;
and S6, returning the ammonia gas after removing the impurities to an ammonia gas absorption cooler to produce dilute ammonia water, and sending the dilute ammonia water to an ammonia water tank and then to a flue gas desulfurization device by a dilute ammonia water pump.
In the process, preferably, a double-medium filter is arranged in the gas-water separation device.
The process as described above, preferably, is used for CO removal by medium-pressure steam rectification in a deacidification column2、H2And S acid gas.
In the above process, it is preferable that in step S1, the field management is enhanced, the oil layer condition of each oil separator is timely grasped, the oil is timely collected, and the oil content in the gas water is reduced.
In the above process, preferably, the desalted water is a solution for removing calcium and magnesium ions.
(III) advantageous effects
The invention has the beneficial effects that:
the oil removing process for the oil-containing ammonia gas provided by the invention has the advantages that the ammonia oil content in the product of the ammonia refining device is reduced to below half from 1800-2400 mg/L, and the ammonia oil content is reduced to 200 mg/L; by optimizing the water quality of the gas-water separation device, the suspended matters in the gas washing water are settled, the filtering load of the double-medium filter is reduced, the filtering efficiency of the double-medium filter is improved, the service cycle of the equipment is prolonged, and the cost is saved; the ammonia content in the phenol water is reduced by adding a gas phase pipeline of the deacidification tower, the total ammonia content in the tower bottom liquid of the deamination tower is reduced to be below 0.25g/L from 0.45 g/L, and the oil content in the delivered gas water is reduced to be below 0.25g/L from 0.4 g/L and is reduced by 37.5 percent; the process operation is optimized, the coal ash content in the extraction liquid of the phenol ammonia recovery device is reduced, the consumption of an extracting agent (diisopropyl ether) adopted in the existing equipment is reduced, the consumption of the diisopropyl ether is reduced by about 5t per month, and the cost is greatly saved.
Drawings
Fig. 1 is a schematic diagram of an oil-containing ammonia gas oil removal treatment system.
[ description of reference ]
1: a gas-water separation device;
2: a deacidification tower;
3: changing an acid gas pipeline;
4: a deamination tower;
5: an ammonia purification tower;
6: desalting water;
7: qualified ammonia gas;
8: removing the sewage and the diluted phenol water.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
Example 1
A process for removing oil from oil-containing ammonia gas comprises the following steps of (1) passing raw material water of oil-containing ammonia gas to be treated through a gas-water separation device (1), settling suspended matters in gas washing water, reducing the filtering load of a double-medium filter, and improving the filtering efficiency of the double-medium filter; the water quality is rectified by medium-pressure steam in a deacidification tower 2 through a gas-water separation device 1 to obtain acid gas and deacidified water, the deacidified water enters the kettle liquid of the deacidification tower, and the acid gas is sent to a start-up torch for combustion through an acid gas pipeline 3; the method comprises the following steps that a deacidification tower kettle liquid is sent to a deamination tower 4, crude ammonia gas resolved from the tower top of the deamination tower 4 is cooled by an ammonia gas two-stage condensation cooler, the ammonia gas subjected to gas-liquid separation in a liquid separating tank is the crude ammonia gas, and the crude ammonia gas is sent to an ammonia purification tower 5 of an ammonia refining device for washing and purification, in the process, desalted water 6 is added into the ammonia purification tower 5 for washing and purification of the ammonia gas, the desalted water is specifically used for improving the oil removal effect, purification is carried out, and the washed ammonia gas is sent to an alkaline washing settling tank for alkaline washing to remove the impurities of phenol, oil and sulfur-containing compounds in; qualified ammonia gas 7 is produced after alkaline washing. And the ammonia gas after impurity removal returns to the ammonia gas absorption cooler to produce dilute ammonia water, and the dilute ammonia water enters the ammonia water tank and is then pumped to the flue gas desulfurization device by the dilute ammonia water pump. The lower end of the deamination tower 4 flows out to be the dilute phenol water 8 of the decontamination water. Through the optimized process operation, the coal ash content in the extraction liquid of the phenol ammonia recovery device in the prior art can be reduced, the consumption of an extracting agent (diisopropyl ether) is reduced, and the consumption of diisopropyl ether is reduced by about 5t per month.
The oil removing process of the oil-containing ammonia gas comprises the steps of timely mastering the oil layer condition of each oil separator by researching a gas-water separation device and strengthening field management, timely collecting oil, reducing the oil content in gas water, and realizing that the ammonia oil content in an ammonia refining device product is reduced to below half from 1800-2400 mg/L and the ammonia oil content is reduced to 200 mg/L; the filtering efficiency of the double-medium filter is improved to optimize the quality of the feed water of the deamination tower; a DN100 pipeline is added from a gas phase pipeline at the top of the phenol ammonia recovery deacidification tower to a gasification start-up torch to serve as an acid gas pipeline, so that effective extraction of gas phase of the deacidification tower is guaranteed, and effective removal of acid gas in the residue liquid of the deacidification tower is guaranteed. Because the oil content in the dilute ammonia water is higher, measures such as changing the washing water of the ammonia purification tower from the dilute ammonia water to desalted water and the like are taken to reduce the oil content in the gas ammonia and the ammonia water in the ammonia refining device product. The comprehensive process is researched, the use of an extracting agent is reduced, and the biochemical treatment efficiency of the wastewater is effectively improved. The total ammonia content of the tower bottom liquid of the deamination tower is reduced to be below 0.25g/L from 0.45 g/L, and the oil content of the delivered gas water is reduced to be below 0.25g/L from 0.4 g/L and is reduced by 37.5 percent; the process operation is optimized, the coal ash content in the extraction liquid of the phenol ammonia recovery device is reduced, the consumption of an extracting agent (diisopropyl ether) is reduced, the consumption of diisopropyl ether is reduced by about 5t per month, and the cost is greatly saved. Therefore, the oil-containing ammonia gas oil removal process which is stable in process, excellent in performance, low in energy consumption and good in separation effect is comprehensively developed.
The tower bottom liquid of the deamination tower is subjected to processes of extraction, rectification, solvent recovery and the like to remove phenol and an extractant in the phenol water, reduce ammonia, phenol and COD in the phenol water, and provide necessary conditions for further treating the phenol water by sewage.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art can change or modify the technical content disclosed above into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (5)
1. A process for removing oil from oil-containing ammonia gas is characterized by comprising the following steps:
s1, treating raw material water containing oil ammonia gas to be treated by a gas-water separation device, removing acid gas from the treated gas water by an acid removal tower, and delivering the removed acid gas to a torch for combustion by an acid gas pipeline;
s2, performing deamination treatment on the deacidified water obtained by the deacidification tower in a deamination tower;
s3, cooling the crude ammonia gas desorbed from the top of the deamination tower by an ammonia gas two-stage condensation cooler, and sending the ammonia gas subjected to gas-liquid separation by a liquid separation tank to an ammonia purification tower for washing;
s4, washing water in the ammonia purification tower is desalted water, so that the oil removal effect is improved;
s5, sending the washed ammonia gas to an alkaline washing settling tank for alkaline washing to remove the impurities of phenol, oil and sulfur-containing compounds in the ammonia gas;
and S6, returning the ammonia gas after removing the impurities to an ammonia gas absorption cooler to produce dilute ammonia water, and sending the dilute ammonia water to an ammonia water tank and then to a flue gas desulfurization device by a dilute ammonia water pump.
2. The process of claim 1 wherein a dual media filter is provided in said gas water separation unit.
3. The process of claim 1, wherein medium pressure steam distillation is used for CO removal in the deacidification column2、H2And S acid gas.
4. The process of claim 1, wherein in step S1, the oil layer condition of each oil separator is timely grasped and oil is timely collected to reduce the oil content in the gas water for the purpose of enhancing field management.
5. The process of claim 1, wherein the desalinated water is a calcium and magnesium ion removing solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110548123.9A CN113086991A (en) | 2021-05-19 | 2021-05-19 | Oil-containing ammonia gas oil removal process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110548123.9A CN113086991A (en) | 2021-05-19 | 2021-05-19 | Oil-containing ammonia gas oil removal process |
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| CN113086991A true CN113086991A (en) | 2021-07-09 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1026736B (en) * | 1954-12-29 | 1958-03-27 | Otto & Co Gmbh Dr C | Apparatus for obtaining ammonia from gas water, in particular coking water |
| DE3517531A1 (en) * | 1984-09-10 | 1986-03-20 | VEB Chemieanlagenbaukombinat Leipzig-Grimma, DDR 7240 Grimma | Process for extracting ammonia from hydrogen sulphide- and/or carbon dioxide-containing aqueous ammonia |
| CN102040234A (en) * | 2009-10-22 | 2011-05-04 | 三菱重工业株式会社 | Ammonia recovery device and recovery method |
| CN103523798A (en) * | 2013-10-31 | 2014-01-22 | 青岛科技大学 | Improved device and method for dephenolization and desulfuration according to ammonium hydroxide washing method |
| CN103523844A (en) * | 2013-11-04 | 2014-01-22 | 内蒙古金石镁业有限公司 | Ammonia stilling system and process |
| CN104355343A (en) * | 2014-11-04 | 2015-02-18 | 赛鼎工程有限公司 | Purification technology for ammonia recycled from wastewater from coal gasification |
| CN104743728A (en) * | 2015-03-27 | 2015-07-01 | 王文领 | Energy-saving type deaminizing method for realizing negative pressure deamination by coking surplus ammonia water |
| CN107235593A (en) * | 2017-07-03 | 2017-10-10 | 天津晟远环境有限公司 | The system and method that a kind of coal gasification water system recovery ammonia is removed with sulphur |
| CN111847478A (en) * | 2020-07-30 | 2020-10-30 | 武汉科林化工集团有限公司 | Comprehensive treatment process for conversion condensate |
-
2021
- 2021-05-19 CN CN202110548123.9A patent/CN113086991A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1026736B (en) * | 1954-12-29 | 1958-03-27 | Otto & Co Gmbh Dr C | Apparatus for obtaining ammonia from gas water, in particular coking water |
| DE3517531A1 (en) * | 1984-09-10 | 1986-03-20 | VEB Chemieanlagenbaukombinat Leipzig-Grimma, DDR 7240 Grimma | Process for extracting ammonia from hydrogen sulphide- and/or carbon dioxide-containing aqueous ammonia |
| CN102040234A (en) * | 2009-10-22 | 2011-05-04 | 三菱重工业株式会社 | Ammonia recovery device and recovery method |
| CN103523798A (en) * | 2013-10-31 | 2014-01-22 | 青岛科技大学 | Improved device and method for dephenolization and desulfuration according to ammonium hydroxide washing method |
| CN103523844A (en) * | 2013-11-04 | 2014-01-22 | 内蒙古金石镁业有限公司 | Ammonia stilling system and process |
| CN104355343A (en) * | 2014-11-04 | 2015-02-18 | 赛鼎工程有限公司 | Purification technology for ammonia recycled from wastewater from coal gasification |
| CN104743728A (en) * | 2015-03-27 | 2015-07-01 | 王文领 | Energy-saving type deaminizing method for realizing negative pressure deamination by coking surplus ammonia water |
| CN107235593A (en) * | 2017-07-03 | 2017-10-10 | 天津晟远环境有限公司 | The system and method that a kind of coal gasification water system recovery ammonia is removed with sulphur |
| CN111847478A (en) * | 2020-07-30 | 2020-10-30 | 武汉科林化工集团有限公司 | Comprehensive treatment process for conversion condensate |
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Application publication date: 20210709 |