CN107899402B - Tail gas treatment method for chlorohydrination method propylene oxide device - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 69
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 239000007789 gas Substances 0.000 claims abstract description 99
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 42
- 230000008569 process Effects 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000010815 organic waste Substances 0.000 claims abstract description 13
- 239000012855 volatile organic compound Substances 0.000 claims abstract description 11
- 238000005406 washing Methods 0.000 claims abstract description 7
- 239000002253 acid Substances 0.000 claims abstract description 6
- 150000003839 salts Chemical class 0.000 claims abstract description 5
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 12
- 239000003513 alkali Substances 0.000 claims description 12
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 11
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 11
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 10
- XENVCRGQTABGKY-ZHACJKMWSA-N chlorohydrin Chemical compound CC#CC#CC#CC#C\C=C\C(Cl)CO XENVCRGQTABGKY-ZHACJKMWSA-N 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 239000001294 propane Substances 0.000 claims description 6
- 239000003518 caustics Substances 0.000 claims description 5
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 4
- 239000000460 chlorine Substances 0.000 claims description 4
- 229910052801 chlorine Inorganic materials 0.000 claims description 4
- 239000002360 explosive Substances 0.000 claims 1
- 239000002912 waste gas Substances 0.000 abstract description 12
- 238000004880 explosion Methods 0.000 abstract description 7
- 238000002485 combustion reaction Methods 0.000 abstract description 5
- 239000000446 fuel Substances 0.000 abstract description 5
- 239000000126 substance Substances 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000003463 adsorbent Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 150000001335 aliphatic alkanes Chemical class 0.000 description 2
- 150000001336 alkenes Chemical class 0.000 description 2
- 150000001345 alkine derivatives Chemical class 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 230000001699 photocatalysis Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 239000011941 photocatalyst Substances 0.000 description 1
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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
-
- 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
- B01D53/38—Removing components of undefined structure
- B01D53/40—Acidic components
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L5/00—Blast-producing apparatus before the fire
- F23L5/02—Arrangements of fans or blowers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2207/00—Control
- F23G2207/10—Arrangement of sensing devices
- F23G2207/108—Arrangement of sensing devices for hydrocarbon concentration
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2207/00—Control
- F23G2207/20—Waste supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2207/00—Control
- F23G2207/30—Oxidant supply
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Treating Waste Gases (AREA)
Abstract
According to the tail gas treatment method of the chlorohydrination method propylene oxide device, chlorohydrination organic waste gas of the propylene oxide device is subjected to alkaline washing to remove acid gas; then introducing a safe water-sealed tank, wherein the water-sealed tank is provided with an air inlet, and the chlorohydrination organic waste gas and the supplementary air are mixed and then enter a fan; detecting the content of combustible gas in a fan outlet pipeline by a VOC (volatile organic compound) online gas detector, metering by a remote flowmeter, and conveying to a safe water seal tank of a caustic soda flake device; and then enters the molten salt furnace to be used as combustion-supporting air for incineration, and an interlocking control method is included for determining safety in work. The process dilutes a great amount of tail gas to reach the explosion limit concentration of each component of the tail gas below 25%, and then burns the tail gas as combustion-supporting air of the incinerator, so that the process is safe to operate, can completely and effectively treat waste gas, and even can recover heat or save fuel consumption on specific combustion equipment.
Description
Technical Field
The invention provides a tail gas treatment method of a chlorohydrination method propylene oxide device, which is applied to a chemical device for generating organic waste gases such as alkane, alkene, alkyne and the like.
Background
The existing tail gas treatment technology comprises the following steps:
1. an adsorption method: the organic tail gas is mainly adsorbed by an adsorbent, such as activated carbon, and the adsorbent is replaced periodically. However, this process has an adsorbent that needs to be replenished and regenerated; the waste gas with higher temperature needs to be cooled firstly; complex exhaust gases require pretreatment.
The main disadvantages of this method are: the operation needs to be carried out under a certain pressure condition, and the concentration of oxygen in the tail gas of the chlorohydrination method propylene oxide device is higher than about 45 percent, so that if the tail gas is compressed, the tail gas has the danger of explosion. Secondly, if the desorption process is not properly selected, the problems of secondary pollution and the like exist, so that the adsorption method is not suitable for treating the tail gas of the chlorohydrin method propylene oxide device.
2. Low-temperature plasma method: the water-washed waste gas is subjected to moisture removal by a demister and then enters a low-temperature plasma equipment treatment system, the gas entering the low-temperature plasma equipment is moisture-free, dust-free and particle-free, the waste gas enters the plasma equipment, odor molecules are excited under the action of high-energy electrons, charged particles or chemical bonds among molecules are broken, meanwhile, water and oxygen in the air can generate strong oxidizing substances such as OH free radicals, active oxygen and the like under the bombardment of the high-energy electrons, and the strong oxidizing substances react with organic gas molecules to decompose the organic gas molecules. The method has potential safety hazard; the occupied area is large, secondary pollution is possible to generate, and the mechanism is to be researched.
The main disadvantages of this method are: the reactor is easy to generate spark discharge under high peak voltage, and the organic tail gas has high oxygen content and is easy to explode for the tail gas of the propylene oxide device. And the requirements on the configuration design, the manufacturing precision, the tightness and the like of equipment parts of the low-temperature plasma equipment are high. For example, for parameters such as electric field frequency, voltage, high-frequency pulse and the like, if a certain parameter in the complete equipment cannot meet the requirement, such as low voltage, overhigh frequency, overlow frequency and the like, the generation amount of plasma can be greatly influenced, and even explosion can be caused.
3. Photocatalytic oxidation method: the waste gas enters the main pipeline and then is sent into a waste gas purification unit, chemical pretreatment is carried out in a concentration homogenizer, and the adopted washing liquid is an acidic washing liquid. The absorption liquid has obvious absorption and release effects on the waste gas. The absorption of the absorption liquid to the main components of the waste gas ensures the stability of the concentration of the waste gas. And the waste gas pretreated by the washing tower enters a photocatalytic oxidation reaction tower. The photochemical oxidation technology is to oxidize and degrade organic pollutants under the action of visible light or ultraviolet light, and finally to discharge the gas at high altitude through a fan and an exhaust funnel.
Disadvantages of the catalytic oxidation technique: this method uses a photocatalyst, and has a problem of catalyst deactivation; the method has the advantages of incapability of opening high-bond-energy chemical bonds and limited oxidation efficiency, and due to the limited reaction conditions, photochemical oxidation degradation is not thorough enough and is easy to generate various organic intermediates, so that the method is not suitable for treating tail gas of a chlorohydrin method propylene oxide device.
The existing tail gas treatment process in the petrochemical industry at present can not realize effective and thorough treatment of tail gas of a chlorohydrin method propylene oxide device, and after analyzing components and properties of the tail gas of the chlorohydrin method, the invention provides a technology for burning the tail gas of the chlorohydrin method propylene oxide device as combustion-supporting air after the tail gas is diluted to safe concentration. The technology is different from the traditional tail gas incineration technology, and in oil refining and other chemical devices, the tail gas is used as fuel for incineration, if the tail gas of the chlorohydrination propylene oxide device is directly incinerated, the concentration of organic combustible substances is low and is not easy to combust, and moreover, the oxygen concentration of the tail gas of the chlorohydrination propylene oxide device is higher, so that the risk of backfire explosion exists in the incineration process. The process not only has safe operation, but also can completely and effectively treat the waste gas, and even can recover heat or save the fuel consumption on specific combustion equipment.
Disclosure of Invention
1. Technical problem to be solved
In order to solve the defects of potential safety hazard, incomplete secondary treatment and purification and the like in the prior art, the invention provides a tail gas treatment method of a chlorohydrination method propylene oxide device, which solves the problem of pollution caused by the emission of organic waste gases such as alkane, alkene and alkyne and the like in a chemical device.
2. Technical scheme
The object of the present invention is achieved mainly by the following technical means.
The tail gas treatment method of the chlorohydrination method propylene oxide device comprises the following steps:
1) removing acid gas from chlorohydrination organic waste gas of a propylene oxide device through an alkaline washing tower;
2) introducing the organic waste gas without the acid gas into a safe water-sealed tank, wherein the water-sealed tank is provided with a supplementary air inlet, and the chlorohydrination organic waste gas and the supplementary air are mixed and then enter a fan;
3) detecting the content of combustible gas in a fan outlet pipeline by a VOC (volatile organic compound) online gas detector, metering by a remote flowmeter, and conveying to a safe water seal tank of a caustic soda flake device;
4) the gas in the safe water seal tank of the flake caustic soda device is sent into the molten salt furnace by a flake caustic soda fan to be used as combustion-supporting air for incineration.
The method also comprises an interlocking control method, and the following interlocking control is realized through detected parameters according to the total concentration of propylene and propane in the tail gas, the ratio K value of chlorine and propylene in the tail gas, the flow of the fan and the working state of the fan:
(1) when the total concentration of propylene and propane is more than 0.5%, simultaneously opening an emptying adjusting valve and an emptying quick-opening valve, stopping the fan in a linked mode, and closing a piece feeding alkali cut-off valve;
(2) when the ratio K value is larger than 0.6200, the emptying regulating valve and the emptying quick-opening valve are opened simultaneously, the fan is stopped in a linked mode, and the flake feeding alkali cut-off valve is closed;
(3) when the flow of the fan is less than 5000m3When the pressure is higher than the preset pressure, the vent adjusting valve and the vent quick-opening valve are opened at the same time, the fan is stopped in a linked mode, and the flake feeding alkali cut-off valve is closed;
(4) when the fan stops running suddenly, the emptying regulating valve and the emptying quick-opening valve are opened simultaneously, and the tablet feeding alkali cut-off valve is closed.
Further, the concentration of each combustible component in the gas as combustion-supporting air is below 25% of the explosion limit concentration of the gas.
Further, in the step 4), the caustic soda flake fan is provided with a drainage facility with an N-shaped bend for draining water and maintaining the pressure in the pipeline.
Furthermore, according to the requirements of safety control in the gas conveying process, an emergency emptying valve is arranged at a vent of the propylene oxide caustic tower, an emergency cut-off valve is arranged at a pipeline of a fan conveying outlet, and an emergency emptying valve is arranged at an air inlet of a safety water seal tank of the caustic soda flake device.
3. Has the advantages that:
compared with the prior art, the tail gas treatment method of the chlorohydrination method propylene oxide device has the beneficial effects that:
the traditional tail gas incineration process is generally applied to oil refining devices and chemical devices with higher tail gas concentration, the devices are generally provided with combustion furnaces or torches, the tail gas is used as fuel to be directly combusted, and the traditional incineration process technology cannot be used for the tail gas with the very low oxygen content of the organic matter concentration of the chlorohydrination propylene oxide device. Firstly, the tail gas concentration of a chlorohydrination method propylene oxide device is very low, and the combustion is very unstable or can not be ignited; and secondly, even if the combustion is carried out by a method of adding fuel, because the concentration of oxygen in tail gas is very high, the risk of backfire explosion exists, and the two characteristics determine that the organic waste gas by the chlorohydrination method cannot be combusted by using the traditional incineration process.
Therefore, the scheme of the invention carries out mass air dilution on the waste gas of the chlorohydrination method propylene oxide device, dilutes the concentration of the main organic combustible to be below 25 percent of the lower explosion limit of organic matters in the air, meets the safety requirement of the national environmental protection standard of the people's republic of China (air pollution control engineering technical guide)' HJ 2000-20106.4.5, and then carries out incineration treatment as the combustion-supporting air of the incinerator. The tail gas composed of similar components in other petrochemical devices can be thoroughly treated, and the organic waste gas is thoroughly treated by burning without secondary pollution.
2) The invention is characterized in that the tail gas incineration treatment process is different from the traditional incineration process, and the operation of the process is more economic and safer.
Drawings
FIG. 1 is a flow chart of an apparatus for the production method of the present invention.
In the figure: 1-an alkaline washing tower, 2-a safe water seal tank, 3-a fan, 4-a sheet caustic soda device safe water seal tank, 5-a sheet caustic soda fan, 6-a molten salt furnace, 7-a VOC detector, 8-a remote flow meter, 9-a sheet caustic soda delivery cut-off valve, 10-an emptying quick-open valve, 11-an emptying adjusting valve, 12-a secondary caustic soda tank, 13-an N-shaped bend and 14-clean water.
Detailed Description
Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings, and it will be apparent to those skilled in the art from this detailed description that the present invention can be practiced. Features from different embodiments may be combined to yield new embodiments, or certain features may be substituted for certain embodiments to yield yet further preferred embodiments, without departing from the principles of the present invention.
FIG. 1 illustrates a process for treating the tail gas of a chlorohydrin process propylene oxide plant constructed in accordance with a preferred embodiment of the present invention. As shown in figure 1, chlorohydrination tail gas of a propylene oxide device is subjected to acid gas removal by an alkaline tower 1, and then introduced into a safe water-sealed tank 2, the water-sealed tank 2 is provided with an air inlet, chlorohydrination organic waste gas and supplementary air are mixed and then enter a fan 3, gas in a fan outlet pipeline is subjected to detection of combustible gas content by a VOC online gas detector 7, then is measured by a remote flow meter 8 and then is conveyed to a safe water-sealed tank 4 of a caustic soda flake device, and then enters a molten salt furnace 6 through a caustic flake fan 5 to be burned as combustion-supporting air. As the gas passes through the safety water seal, the water content in the gas is higher, and in the gas conveying process, a drainage facility with an N-shaped bend 13 is designed at the low point of the pipeline of the flake caustic soda fan, so that the water can be drained and the pressure in the pipeline can be kept. According to the requirements of safety control in the gas conveying process, an emergency emptying valve is arranged at a vent of the propylene oxide caustic tower, an emergency cut-off valve is arranged at a pipeline of a fan conveying outlet, and the emergency emptying valve is arranged at an air inlet of a water seal tank of a caustic soda flake device.
Wherein, the tail gas of the chlorohydrination method propylene oxide device comprises the following components:
in order to realize the safe treatment of chlorohydrination tail gas, the tail gas treatment device is provided with the following interlocks: a VOC online gas detector 7, a remote flow meter 8 and a flake caustic soda delivery cut-off valve 9 are sequentially connected between the fan 3 and the flake caustic soda device safety water seal tank 4, and an emptying quick-open valve 10 and an emptying regulating valve 11 are connected above the caustic tower 1. The VOC on-line gas detector 7 detects the total concentration of propylene and propane in the tail gas; the interlocking control system also detects the K value of the ratio of chlorine to propylene in the tail gas, the flow of the fan and the working state of the fan; the interlock control system realizes interlock control through the detected parameters, and the specific control is as follows:
(1) the VOC detector detects that the total concentration of propylene (C3H6) and propane (C3H8) gas is more than 0.5 percent, the interlocking result is that the emptying adjusting valve 11 and the emptying quick-opening valve 10 are opened at the same time, the fan 3 is stopped in a linked jumping mode, and the sheet-feeding alkali cut-off valve 9 is closed.
(2) The ratio K value is more than 0.6200, the interlocking result is that the emptying regulating valve 11 and the emptying quick-opening valve 10 are opened at the same time, the fan 3 is stopped in a chain jumping mode, and the flake-feeding alkali cut-off valve 9 is closed; the K value is the ratio of chlorine to propylene in the organic tail gas.
(3) The flow of the fan is less than 4000m3And h, the interlocking result is that the emptying regulating valve 11 and the emptying quick-opening valve 10 are opened at the same time, the fan 3 is stopped in a linked mode, and the flake feeding alkali cut-off valve 9 is closed.
(4) The fan stops running suddenly, and the interlocking result is that the emptying regulating valve 11 and the emptying quick-opening valve 10 are opened at the same time, and the tablet-feeding alkali cut-off valve 9 is closed.
Although the present invention has been described above with reference to specific embodiments, it will be appreciated by those skilled in the art that many modifications are possible in the arrangement and details of the invention disclosed within the principle and scope of the invention. The scope of the invention is to be determined by the appended claims, and all changes that come within the meaning and range of equivalency of the technical features are intended to be embraced therein.
Claims (4)
1. The tail gas treatment method of the chlorohydrination method propylene oxide device comprises the following steps:
1) removing acid gas from chlorohydrination organic waste gas of a propylene oxide device through an alkaline washing tower;
2) introducing the organic waste gas without the acid gas into a safe water-sealed tank, wherein the water-sealed tank is provided with an air inlet, and the chlorohydrination organic waste gas and the supplementary air are mixed and then enter a fan;
3) detecting the content of combustible gas in a fan outlet pipeline by a VOC (volatile organic compound) online gas detector, metering by a remote flowmeter, and conveying to a safe water seal tank of a caustic soda flake device;
4) the gas in the safe water seal tank of the flake caustic soda device is sent into a molten salt furnace by a flake caustic soda fan to be used as combustion-supporting air for incineration;
the method is characterized in that: the method also comprises an interlocking control method, and the following interlocking control is realized through detected parameters according to the total concentration of propylene and propane in the tail gas, the ratio K value of chlorine and propylene in the tail gas, the flow of the fan and the working state of the fan:
(1) when the total concentration of propylene and propane is more than 0.5%, simultaneously opening an emptying adjusting valve and an emptying quick-opening valve, stopping the fan in a linked mode, and closing a piece feeding alkali cut-off valve;
(2) when the ratio K value is larger than 0.6200, the emptying regulating valve and the emptying quick-opening valve are opened simultaneously, the fan is stopped in a linked mode, and the flake feeding alkali cut-off valve is closed;
(3) when the flow of the fan is less than 5000m3When the pressure is higher than the preset pressure, the vent adjusting valve and the vent quick-opening valve are opened at the same time, the fan is stopped in a linked mode, and the flake feeding alkali cut-off valve is closed;
(4) when the fan stops running suddenly, the emptying regulating valve and the emptying quick-opening valve are opened simultaneously, and the tablet feeding alkali cut-off valve is closed.
2. The method for treating tail gas of a chlorohydrin process propylene oxide plant of claim 1, wherein the concentration of each combustible component in the gas as combustion-supporting air is less than 25% of the explosive limit concentration of the combustible component.
3. The tail gas treatment method for the chlorohydrin process propylene oxide plant according to claim 2, wherein in the step 4), the caustic soda flake blower is provided with a drainage facility with an N-shaped bend for draining water and maintaining the pressure in the pipeline.
4. The tail gas treatment method for the chlorohydrination process of propylene oxide plant according to claim 3, wherein an emergency emptying valve is arranged at the vent of the propylene oxide caustic tower, an emergency cut-off valve is arranged at the pipeline of the fan delivery outlet, and an emergency emptying valve is arranged at the gas inlet of the safety water seal tank of the caustic soda flake plant according to the requirements of safety control of the gas delivery process.
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| CN109631056A (en) * | 2019-01-31 | 2019-04-16 | 滨化集团股份有限公司 | A kind of technique of propylene oxide chlorohydrination tail gas and trichloro ethylene house exhaust combined governance |
| CN114642950B (en) * | 2020-12-21 | 2024-03-26 | 浙江国宇塑业有限公司 | Explosion-proof equipment is used in formaldehyde production |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203349652U (en) * | 2013-06-03 | 2013-12-18 | 滨化集团股份有限公司 | Molten salt furnace control device in solid caustic soda production |
| US20160030883A1 (en) * | 2013-04-24 | 2016-02-04 | Jiangsu New Century Jiangnan Environmental Protection Co., Ltd. | Method and apparatus for treating acidic tail gas by using ammonia process flue gas |
| CN106362547A (en) * | 2015-07-23 | 2017-02-01 | 中国石油化工股份有限公司 | Sulfur-containing organic waste gas treatment method and sulfur-containing organic waste gas treatment apparatus |
| CN206535389U (en) * | 2017-02-14 | 2017-10-03 | 福建湄洲湾氯碱工业有限公司 | A kind of processing system of chlorohydrination method tail gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160030883A1 (en) * | 2013-04-24 | 2016-02-04 | Jiangsu New Century Jiangnan Environmental Protection Co., Ltd. | Method and apparatus for treating acidic tail gas by using ammonia process flue gas |
| CN203349652U (en) * | 2013-06-03 | 2013-12-18 | 滨化集团股份有限公司 | Molten salt furnace control device in solid caustic soda production |
| CN106362547A (en) * | 2015-07-23 | 2017-02-01 | 中国石油化工股份有限公司 | Sulfur-containing organic waste gas treatment method and sulfur-containing organic waste gas treatment apparatus |
| CN206535389U (en) * | 2017-02-14 | 2017-10-03 | 福建湄洲湾氯碱工业有限公司 | A kind of processing system of chlorohydrination method tail gas |
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Denomination of invention: Treatment of tail gas from epichlorohydrin plant Effective date of registration: 20220613 Granted publication date: 20210406 Pledgee: Binzhou Bincheng Branch of China Construction Bank Co.,Ltd. Pledgor: BEFAR GROUP Co.,Ltd. Registration number: Y2022980007697 |
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