CN220779679U - Tail gas damage system for gaseous phosgene preparation - Google Patents
Tail gas damage system for gaseous phosgene preparation Download PDFInfo
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- CN220779679U CN220779679U CN202322156143.9U CN202322156143U CN220779679U CN 220779679 U CN220779679 U CN 220779679U CN 202322156143 U CN202322156143 U CN 202322156143U CN 220779679 U CN220779679 U CN 220779679U
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- 230000006378 damage Effects 0.000 title claims abstract description 159
- YGYAWVDWMABLBF-UHFFFAOYSA-N Phosgene Chemical compound ClC(Cl)=O YGYAWVDWMABLBF-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title claims description 13
- 239000003513 alkali Substances 0.000 claims abstract description 210
- 239000007788 liquid Substances 0.000 claims abstract description 86
- 239000000460 chlorine Substances 0.000 claims abstract description 48
- 238000000926 separation method Methods 0.000 claims abstract description 48
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 47
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 47
- 230000015572 biosynthetic process Effects 0.000 claims description 22
- 238000003786 synthesis reaction Methods 0.000 claims description 22
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 239000000945 filler Substances 0.000 claims description 10
- 238000010521 absorption reaction Methods 0.000 claims description 9
- 238000010992 reflux Methods 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 2
- 230000004044 response Effects 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000011152 fibreglass Substances 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 3
- 230000007062 hydrolysis Effects 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 230000010485 coping Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011268 retreatment Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- NHYCGSASNAIGLD-UHFFFAOYSA-N chlorine monoxide Inorganic materials Cl[O] NHYCGSASNAIGLD-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The utility model provides a tail gas destruction system for preparing gaseous phosgene, which comprises a tail gas destruction unit, a chlorine destruction unit, an alkali liquor supply unit and a gas-liquid separation buffer unit; the tail gas destruction unit comprises a tail gas treatment pipeline I, a tail gas treatment pipeline II and an alkali destruction unit I connected with the tail gas treatment pipeline I and the tail gas treatment pipeline II; the chlorine destruction unit comprises a residual chlorine treatment pipeline and a second alkali destruction unit connected with the residual chlorine treatment pipeline; the alkali liquor supply unit supplies alkali liquor to the alkali destruction unit I and the alkali destruction unit II; and the tail gas treated by the first alkali damage unit and the second alkali damage unit enters a gas-liquid separation buffer unit for treatment and is discharged. The tail gas destruction system adopts a multi-route treatment mode, can be used for respectively treating according to different working conditions, has strong emergency capability, timely response and high working efficiency.
Description
Technical Field
The utility model belongs to the technical field of light tail gas treatment, and particularly relates to a tail gas damage system for gaseous phosgene preparation.
Background
Phosgene, also known as phosgene, is a colorless or yellowish gas and is extremely toxic. The phosgene preparation relates to safety and environmental protection, the requirements of a tail gas treatment system are higher, the technical data for treating the tail gas in the phosgene synthesis process are less in the current industry, and a single-flow tail gas treatment mode is generally adopted. The phosgene is generated by the reaction of chlorine and carbon monoxide, so that the tail gas generated during normal production needs to be solved in the phosgene preparation process, the tail gas generated in other aspects needs to be solved, firstly, under normal production, residual chlorine in a liquid chlorine steel cylinder needs to be destroyed by the synthesis of the used chlorine, secondly, the tail gas is required to be destroyed by an interlocking tail gas stop valve under the condition of shutdown maintenance or emergency, and the existing tail gas treatment mode has the problems of single route, incapability of realizing separate treatment under different working conditions in time, poor emergency capability and incapability of responding to unexpected conditions in time.
Disclosure of Invention
In view of the above, the utility model provides a tail gas destruction system for gaseous phosgene preparation, which adopts a multi-route treatment mode, can be respectively treated according to different working conditions, and has the advantages of strong emergency capability, timely response and high working efficiency.
In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:
an exhaust destruction system for gaseous phosgene production comprising:
the tail gas destruction unit comprises a tail gas treatment pipeline I, a tail gas treatment pipeline II and an alkali destruction unit I connected with outlet ends of the tail gas treatment pipeline I and the tail gas treatment pipeline II;
the chlorine destruction unit comprises a residual chlorine treatment pipeline and a second alkali destruction unit connected with the outlet end of the residual chlorine treatment pipeline;
an alkali liquor supply unit that supplies alkali liquor to the first alkali destruction unit and the second alkali destruction unit;
and the tail gas treated by the first alkali damage unit and the second alkali damage unit enters the gas-liquid separation buffer unit for treatment and is discharged.
The tail gas destruction system is provided with a chlorine destruction unit aiming at the chlorine to be treated, and can be used for treating the residual chlorine in the steel cylinder; the tail gas damage unit is arranged for the tail gas generated in the parking maintenance or emergency state, so that the tail gas damage unit can be used for treating the tail gas in the emergency state, a multi-route treatment mode is realized, various working conditions can be treated, the emergency capacity is high, and the response is timely; the alkali liquor supply unit can timely supply alkali liquor into the alkali destruction unit I and the alkali destruction unit II, the gas-liquid separation buffer unit can separate the gas from the entering treated tail gas, the tail gas is analyzed by the online analyzer before the separated gas is discharged, and the tail gas is discharged after reaching the standard.
Further, the first tail gas treatment pipeline is connected with a reactor rupture disk pressure relief system of the phosgene synthesis workshop, and an automatic valve which is opened after receiving an overpressure signal in the reactor is arranged on the first tail gas treatment pipeline; the second tail gas treatment pipeline is connected with an SIS system of the phosgene synthesis workshop, and an automatic valve which is opened after receiving a signal of overhigh phosgene synthesis temperature or gas leakage in the phosgene synthesis workshop is arranged on the second tail gas treatment pipeline.
When the reactor of the phosgene synthesis workshop is overpressured, the rupture disk is opened for pressure relief, an automatic valve on the tail gas treatment pipeline I is opened after receiving an overpressure signal in the reactor, and gas discharged by the pressure relief of the reactor enters the alkali destruction unit I for treatment through the tail gas treatment pipeline I; when the phosgene synthesis temperature in the phosgene synthesis workshop is too high or the phosgene synthesis workshop has gas leakage, triggering and interlocking, opening an automatic valve on a tail gas treatment pipeline II, and allowing the discharged gas to enter a first alkali destruction unit for treatment through the tail gas treatment pipeline II.
Further, the first alkali breaking unit comprises a first alkali breaking tower and a second alkali breaking tower which are arranged in series, a first fan which is arranged on a pipeline and used for providing power for gas flow, and a pressure gauge for monitoring pressure; the first air inlet of the first alkali destruction tower is connected with the outlet end of the first tail gas treatment pipeline, and the second air inlet of the first alkali destruction tower is connected with the outlet end of the second tail gas treatment pipeline; the treated tail gas outlet of the second alkali destruction tower is connected with the inlet end of the gas-liquid separation buffer unit;
the alkaline destruction unit II comprises an alkaline destruction tower III and a fan II which is arranged on a pipeline and used for providing power for gas flow, an air inlet I of the alkaline destruction tower III is connected with the outlet end of the residual chlorine treatment pipeline, and a tail gas outlet after treatment of the alkaline destruction tower III is connected with the inlet end of the gas-liquid separation buffer unit.
The tail gas enters the first alkali destruction tower for treatment, then enters the separation buffer unit for gas-liquid separation after being treated again by the second alkali destruction tower, and the flow of the tail gas is powered by the first fan, so that the smooth flow of the tail gas in the pipeline is ensured; after the chlorine tail gas to be treated enters the alkaline destruction tower III for treatment, the chlorine tail gas enters the separation buffer unit for gas-liquid separation, and the flow of the chlorine tail gas is powered by the fan II, so that the smooth flow of the chlorine tail gas in the pipeline is ensured.
Further, the alkali liquor supply units are not less than one group, and the alkali liquor supply units comprise an alkali liquor tank, an online PH meter for monitoring the PH value of alkali liquor in the alkali liquor tank, and an alkali pump set for pumping the alkali liquor in the alkali liquor tank to the alkali destruction unit I and/or the alkali destruction unit II.
The pH value in the alkali liquid tank is controlled between 9 and 14, and when the pH value is less than 9, the alkali is replaced in time and new alkali liquid is pumped in, and the alkali content of the new alkali liquid is controlled between 5% and 15% by monitoring through an online pH meter.
Further, the lye supply units have two groups; the alkaline liquid supply units of one group are used for supplying alkaline liquid to the alkaline destruction tower I, and a bottom liquid outlet of the alkaline destruction tower I is connected with a reflux port of an alkaline liquid tank in the alkaline liquid supply units of one group; the other group of alkali liquor supply units are used for supplying alkali liquor to the second alkali destruction tower and the third alkali destruction tower, and the bottom liquor outlet of the second alkali destruction tower and the bottom liquor outlet of the third alkali destruction tower are connected with the reflux ports of the alkali liquor tanks in the other group of alkali liquor supply units.
The alkali liquor in the alkali liquor tank is sent into the alkali destruction tower by an alkali pump, flows from top to bottom in the tower, flows reversely with the entering tail gas to be treated, finally falls to the bottom of the tower, and flows out from the bottom of the tower and returns to the alkali liquor tank.
Further, the alkali pump group comprises two alkali pumps, wherein one alkali pump is a standby alkali pump.
Further, the filler filled in the first alkali damage tower, the second alkali damage tower and the third alkali damage tower is pall ring.
The alkali tower is made of glass fiber reinforced plastic, and the filler is pall rings, so that the pall rings have the advantages of large flux, small resistance, high separation efficiency, high operation elasticity and the like, and the treatment capacity can be more than 50% higher than that of Raschig rings under the same depressurization. At the same treatment capacity, the pressure drop can be reduced by half, and the mass transfer efficiency can be improved by about 20%. The polypropylene pall ring packing has many window holes in the ring wall to make the gas and liquid inside the tower pass through the window holes freely, so that the distribution of gas and liquid inside the packing layer is improved greatly compared with that of Raschig ring, especially the inside surface of the packing ring is easy to be wetted with liquid, and the inside surface is utilized fully.
Further, the gas-liquid separation buffer unit is a gas-liquid separation buffer tower, and is made of glass fiber reinforced plastic, and the upper part in the gas-liquid separation buffer tower is filled with a filler; the tail gas treated by the first alkali damage unit and the second alkali damage unit enters through an inlet of the gas-liquid separation buffer tower, which is positioned below the filler, a bottom liquid outlet of the gas-liquid separation buffer tower is connected with a reflux port of the alkali liquid supply unit, a top tail gas discharge port of the gas-liquid separation buffer tower is connected with a discharge chimney through a pipeline, and an online analyzer is arranged in front of the discharge chimney to analyze the gas content.
Further, the tail gas destruction unit further comprises a conventional tail gas treatment pipeline, and the outlet end of the conventional tail gas treatment pipeline is connected with the first alkali destruction unit.
The tail gas before entering the conventional tail gas treatment pipeline firstly passes through conventional tail gas treatment procedures such as organic matter adsorption, catalytic hydrolysis and the like, and then enters the first alkali destruction unit through the conventional tail gas treatment pipeline; the pipeline for treating the conventional tail gas is connected into the tail gas damage system, so that the application range is enlarged, and the tail gas damage system can be combined with the conventional tail gas treatment system besides coping with unexpected working conditions.
Further, the chlorine destruction unit further comprises a chlorine treatment pipeline and an alkali absorption tower, wherein the chlorine treatment pipeline and the residual chlorine treatment pipeline are connected with the alkali destruction unit II after passing through the alkali absorption tower.
The chlorine treatment pipeline is used for coping with the unexpected leakage of chlorine and the like, and realizing the emergency treatment of unexpected working conditions of the steel cylinder.
Compared with the prior art, the tail gas destruction system for preparing gaseous phosgene has the following advantages:
(1) The tail gas destruction system for preparing the gaseous phosgene adopts a multi-route treatment mode, can be respectively treated according to different working conditions, has strong emergency capability, timely response and high working efficiency;
(2) The tail gas destruction system for preparing the gaseous phosgene can respond to unexpected conditions in time, automatically start the first tail gas treatment pipeline and the second tail gas treatment pipeline, quickly open an automatic valve through an interlocking system in an accident state, discharge tail gas and ensure production safety to the greatest extent;
drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:
FIG. 1 is a schematic diagram of an exhaust destruction system for gaseous phosgene production according to example 1 of the present utility model;
FIG. 2 is a schematic diagram of the tail gas destruction system for gaseous phosgene production according to example 2 of the present utility model.
Reference numerals illustrate:
the device comprises a 1-emission chimney, a 2-tail gas treatment pipeline I, a 3-tail gas treatment pipeline II, a 4-alkali destruction tower I, a 5-alkali destruction tower II, a 6-fan I, a 7-pressure gauge, an 8-residual chlorine treatment pipeline, a 9-alkali destruction tower III, a 10-fan II, an 11-alkali liquid tank, a 12-online PH meter, a 13-alkali pump group, a 14-gas-liquid separation buffer tower, a 15-conventional tail gas treatment pipeline, a 16-chlorine treatment pipeline and a 17-alkali absorption tower.
Detailed Description
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in a specific case.
The utility model will be described in detail below with reference to the drawings in connection with embodiments.
Example 1
As shown in fig. 1, a tail gas destruction system for gaseous phosgene preparation comprises a tail gas destruction unit, a chlorine destruction unit, an alkali liquor supply unit, a gas-liquid separation buffer unit and an emission chimney 1;
the tail gas destruction unit comprises a tail gas treatment pipeline I2, a tail gas treatment pipeline II 3 and an alkali destruction unit I; the tail gas treatment pipeline I2 is connected with a reactor rupture disk pressure relief system of a phosgene synthesis workshop, and an automatic valve which is opened after receiving an overpressure signal in the reactor is arranged on the tail gas treatment pipeline I2; the second tail gas treatment pipeline 3 is connected with an SIS system of the phosgene synthesis workshop, and an automatic valve which is opened after receiving a signal of overhigh phosgene synthesis temperature or gas leakage in the phosgene synthesis workshop is arranged on the second tail gas treatment pipeline 3; the first alkali destruction unit comprises a first alkali destruction tower 4 and a second alkali destruction tower 5 which are arranged in series, a first fan 6 which is arranged on a pipeline and used for providing power for gas flow, and a pressure gauge 7 for monitoring pressure; the first air inlet of the first alkali destruction tower 4 is connected with the outlet end of the first tail gas treatment pipeline 2, and the second air inlet of the first alkali destruction tower 4 is connected with the outlet end of the second tail gas treatment pipeline 3; the treated tail gas outlet of the second alkali destruction tower 5 is connected with the inlet end of the gas-liquid separation buffer unit;
the chlorine destruction unit comprises a residual chlorine treatment pipeline 8 and a second alkali destruction unit; the front end of the residual chlorine treatment pipeline 8 is connected with a chlorine system and is used for receiving residual chlorine in the steel cylinder; the second alkali destruction unit comprises a third alkali destruction tower 9 and a second fan 10 which is arranged on a pipeline and is used for providing power for gas flow, the first air inlet of the third alkali destruction tower 9 is connected with the outlet end of the residual chlorine treatment pipeline 8, and the treated tail gas outlet of the third alkali destruction tower 9 is connected with the inlet end of the gas-liquid separation buffer unit;
the first alkali damage tower 4, the second alkali damage tower 5 and the third alkali damage tower 6 are all made of glass fiber reinforced plastics, and filled fillers are all pall rings;
the alkali liquid supply unit comprises an alkali liquid tank 11, an online pH meter 12 for monitoring the pH value of the alkali liquid in the alkali liquid tank 11 and an alkali pump set 13, wherein the alkali pump set 13 comprises two alkali pumps, and one alkali pump is a standby alkali pump; the alkali liquor supply units are divided into two groups, alkali liquor in the alkali liquor tank 11 in one group of alkali liquor supply units is used for supplying alkali liquor to the first alkali destruction tower 4 through an alkali pump, and a bottom liquor outlet of the first alkali destruction tower 4 is connected with a reflux port of the alkali liquor tank 11 in one group; the alkali liquor in the alkali liquor tank 11 in the alkali liquor supply unit of the other group is used for supplying alkali liquor to the second alkali destruction tower 5 and the third alkali destruction tower 9 through an alkali pump, and the bottom liquor outlet of the second alkali destruction tower 5 and the bottom liquor outlet of the third alkali destruction tower 9 are connected with the reflux ports of the alkali liquor tank 11 of the other group;
the gas-liquid separation buffer unit is a gas-liquid separation buffer tower 14, and is made of glass fiber reinforced plastic, and the upper part in the gas-liquid separation buffer tower 14 is filled with filler; the tail gas treated by the first alkali breaking unit and the second alkali breaking unit enters through an inlet of the gas-liquid separation buffer tower 14 positioned below the filler, a bottom liquid outlet of the gas-liquid separation buffer tower 14 is connected with a reflux port of the alkali liquor tank 11, a top tail gas discharge port of the gas-liquid separation buffer tower 14 is connected with a discharge chimney 1 through a pipeline, and an online analyzer is arranged in front of the discharge chimney 1 to analyze the gas content.
Example 2
As shown in fig. 2, on the basis of example 1, the difference from example 1 is that:
the tail gas destruction unit further comprises a conventional tail gas treatment pipeline 15, the front of the conventional tail gas treatment pipeline 15 is connected with conventional tail gas treatment procedures such as organic matter adsorption, catalytic hydrolysis and the like, and the outlet end of the conventional tail gas treatment pipeline 15 is connected with the air inlet III of the alkali destruction tower I4;
the chlorine destruction unit further comprises a chlorine treatment pipeline 16 and an alkali absorption tower 17, wherein the chlorine treatment pipeline 16 and the residual chlorine treatment pipeline 8 are connected with the alkali destruction unit II after passing through the alkali absorption tower 17.
The working process of the tail gas destruction system for gaseous phosgene preparation described in this example is as follows:
residual chlorine (or accidentally leaked chlorine from the steel bottle) enters an alkali destruction tower III 9 after preliminary alkali absorption by an alkali absorption tower 17, the residual chlorine is contacted with alkali liquid provided by an alkali liquid supply unit in the alkali destruction tower III 9, tower bottom liquid flows back into an alkali liquid tank 11, tower top gas enters a gas-liquid separation buffer tower 14 for gas-liquid separation, the separated liquid returns into the alkali liquid tank 11, and the gas is discharged from the tower top of the gas-liquid separation buffer tower 14, analyzed by an online analyzer, and discharged after reaching standards;
when the reactor of the phosgene synthesis workshop is overpressured, the rupture disk is opened for pressure relief, an automatic valve on a tail gas treatment pipeline I2 is opened after receiving an overpressure signal in the reactor, gas discharged from the pressure relief of the reactor enters an alkali destruction tower I4 through the tail gas treatment pipeline I2, the gas contacts alkali liquor provided by an alkali liquor supply unit in the alkali destruction tower I4, tower bottom liquid flows back into an alkali liquor tank 11, tower top gas enters an alkali destruction tower II 5 for retreatment, tower bottom liquid flows back into the alkali liquor tank 11 again, tower top gas enters a gas-liquid separation buffer tower 14 for gas-liquid separation, the separated liquid returns into the alkali liquor tank 11, and the gas is discharged from the tower top of the gas-liquid separation buffer tower 14, analyzed by an online analyzer and discharged after reaching standards; when the phosgene synthesis temperature of a phosgene synthesis workshop is too high or the phosgene synthesis workshop has gas leakage, triggering interlocking, opening an automatic valve on a tail gas treatment pipeline II 3, enabling the discharged gas to enter an alkali destruction tower I4 through the tail gas treatment pipeline II 3, enabling the discharged gas to contact with alkali liquor provided by an alkali liquor supply unit in the alkali destruction tower I4, enabling tower bottom liquid to flow back into an alkali liquor tank 11, enabling tower top gas to enter the alkali destruction tower II 5 for retreatment, enabling tower bottom liquid to flow back into the alkali liquor tank 11 again, enabling tower top gas to enter a gas-liquid separation buffer tower 14 for gas-liquid separation, enabling the separated liquid to return into the alkali liquor tank 11, enabling the gas to be discharged from the tower top of the gas-liquid separation buffer tower 14, analyzing the gas by an online analyzer, and discharging the gas after reaching standards;
the conventional tail gas after the conventional tail gas treatment procedures such as organic matter adsorption, catalytic hydrolysis and the like enters a first alkali destruction tower 4 through a conventional tail gas treatment pipeline 15, contacts alkali liquor provided by an alkali liquor supply unit in the first alkali destruction tower 4, the tower bottom liquid flows back into an alkali liquor tank 11, tower top gas enters a second alkali destruction tower 5 for treatment again, the tower bottom liquid flows back into the alkali liquor tank 11 again, the tower top gas enters a gas-liquid separation buffer tower 14 for gas-liquid separation, the separated liquid returns into the alkali liquor tank 11, and the gas is discharged from the tower top of the gas-liquid separation buffer tower 14, analyzed by an online analyzer and discharged after reaching standards.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (10)
1. An exhaust destruction system for gaseous phosgene production, comprising:
the tail gas destruction unit comprises a tail gas treatment pipeline I, a tail gas treatment pipeline II and an alkali destruction unit I connected with outlet ends of the tail gas treatment pipeline I and the tail gas treatment pipeline II;
the chlorine destruction unit comprises a residual chlorine treatment pipeline and a second alkali destruction unit connected with the outlet end of the residual chlorine treatment pipeline;
an alkali liquor supply unit that supplies alkali liquor to the first alkali destruction unit and the second alkali destruction unit;
and the tail gas treated by the first alkali damage unit and the second alkali damage unit enters the gas-liquid separation buffer unit for treatment and is discharged.
2. The tail gas destruction system for gaseous phosgene preparation of claim 1, wherein: the first tail gas treatment pipeline is connected with a reactor rupture disk pressure relief system of the phosgene synthesis workshop, and is provided with an automatic valve which is opened after receiving an overpressure signal in the reactor; the second tail gas treatment pipeline is connected with an SIS system of the phosgene synthesis workshop, and an automatic valve which is opened after receiving a signal of overhigh phosgene synthesis temperature or gas leakage in the phosgene synthesis workshop is arranged on the second tail gas treatment pipeline.
3. The tail gas destruction system for gaseous phosgene preparation of claim 1, wherein: the first alkali destruction unit comprises a first alkali destruction tower and a second alkali destruction tower which are arranged in series, a first fan which is arranged on a pipeline and used for providing power for gas flow, and a pressure gauge for monitoring pressure; the first air inlet of the first alkali destruction tower is connected with the outlet end of the first tail gas treatment pipeline, and the second air inlet of the first alkali destruction tower is connected with the outlet end of the second tail gas treatment pipeline; the treated tail gas outlet of the second alkali destruction tower is connected with the inlet end of the gas-liquid separation buffer unit;
the alkaline destruction unit II comprises an alkaline destruction tower III and a fan II which is arranged on a pipeline and used for providing power for gas flow, an air inlet I of the alkaline destruction tower III is connected with the outlet end of the residual chlorine treatment pipeline, and a tail gas outlet after treatment of the alkaline destruction tower III is connected with the inlet end of the gas-liquid separation buffer unit.
4. A tail gas destruction system for gaseous phosgene production according to claim 3, characterized in that: the alkali liquor supply units are not less than one group, and comprise alkali liquor tanks, an online PH meter for monitoring the PH value of alkali liquor in the alkali liquor tanks, and an alkali pump set for pumping the alkali liquor in the alkali liquor tanks to the alkali destruction unit I and/or the alkali destruction unit II.
5. The tail gas destruction system for gaseous phosgene production of claim 4, wherein: the alkali liquor supply units are provided with two groups; the alkaline liquid supply units of one group are used for supplying alkaline liquid to the alkaline destruction tower I, and a bottom liquid outlet of the alkaline destruction tower I is connected with a reflux port of an alkaline liquid tank in the alkaline liquid supply units of one group; the other group of alkali liquor supply units are used for supplying alkali liquor to the second alkali destruction tower and the third alkali destruction tower, and the bottom liquor outlet of the second alkali destruction tower and the bottom liquor outlet of the third alkali destruction tower are connected with the reflux ports of the alkali liquor tanks in the other group of alkali liquor supply units.
6. The tail gas destruction system for gaseous phosgene production of claim 4, wherein: the alkali pump group comprises two alkali pumps, wherein one alkali pump is a standby alkali pump.
7. A tail gas destruction system for gaseous phosgene production according to claim 3, characterized in that: and the filler filled in the first alkali damage tower, the second alkali damage tower and the third alkali damage tower is pall rings.
8. The tail gas destruction system for gaseous phosgene preparation of claim 1, wherein: the gas-liquid separation buffer unit is a gas-liquid separation buffer tower, and the upper part in the gas-liquid separation buffer tower is filled with filler; the tail gas treated by the first alkali damage unit and the second alkali damage unit enters through an inlet of the gas-liquid separation buffer tower, which is positioned below the filler, a bottom liquid outlet of the gas-liquid separation buffer tower is connected with a reflux port of the alkali liquid supply unit, and a top tail gas discharge port of the gas-liquid separation buffer tower is connected with a discharge chimney through a pipeline.
9. The tail gas destruction system for gaseous phosgene preparation of any one of claims 1 to 8, wherein: the tail gas destruction unit further comprises a conventional tail gas treatment pipeline, and the outlet end of the conventional tail gas treatment pipeline is connected with the alkali destruction unit I.
10. The tail gas destruction system for gaseous phosgene preparation of any one of claims 1 to 8, wherein: the chlorine destruction unit further comprises a chlorine treatment pipeline and an alkali absorption tower, wherein the chlorine treatment pipeline and the residual chlorine treatment pipeline are connected with the alkali destruction unit II after passing through the alkali absorption tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322156143.9U CN220779679U (en) | 2023-08-11 | 2023-08-11 | Tail gas damage system for gaseous phosgene preparation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322156143.9U CN220779679U (en) | 2023-08-11 | 2023-08-11 | Tail gas damage system for gaseous phosgene preparation |
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| Publication Number | Publication Date |
|---|---|
| CN220779679U true CN220779679U (en) | 2024-04-16 |
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| CN202322156143.9U Active CN220779679U (en) | 2023-08-11 | 2023-08-11 | Tail gas damage system for gaseous phosgene preparation |
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2023
- 2023-08-11 CN CN202322156143.9U patent/CN220779679U/en active Active
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