CN108854460B - Tail gas recovery system in diketene production - Google Patents
Tail gas recovery system in diketene production Download PDFInfo
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- CN108854460B CN108854460B CN201810420049.0A CN201810420049A CN108854460B CN 108854460 B CN108854460 B CN 108854460B CN 201810420049 A CN201810420049 A CN 201810420049A CN 108854460 B CN108854460 B CN 108854460B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1406—Multiple stage absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1412—Controlling the absorption process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
The invention discloses a tail gas recovery system in diketene production, which comprises the following components: the tail gas source is used for collecting the tail gas generated by the diketene production system and guiding the flow direction of the tail gas; the tail gas absorption equipment is used for providing a place for absorbing tail gas for the absorption medium and is communicated with the tail gas source; and the tail gas absorption product receiving equipment is connected with the tail gas absorption equipment and is mainly used for receiving and/or storing the tail gas absorption products generated in the tail gas absorption equipment. The tail gas recovery system in the diketene production can efficiently recover the effective components in the tail gas, and the recovered product can continuously exert the economic value.
Description
Technical Field
The invention belongs to the field of diketene production equipment, and particularly relates to a tail gas recovery system in diketene production.
Background
In the prior art, the production of diketene mostly adopts an acetic acid catalytic cracking method, and cracking gas obtained by the method contains flammable gases such as ketene, ethylene, methane and the like. The combustible gas is absorbed by the absorption tower, ketene in the combustible gas is utilized, and the rest tail gas is sent to the cracking furnace for incineration. In actual production, the absorption tower cannot absorb the ketene in the cracked gas to a full extent, so that the tail gas of production still contains a certain amount of ketene which cannot be utilized. In addition, in the prior art, the tail gas is directly incinerated, and substances which can still be utilized in the tail gas are incinerated, so that waste is caused to raw materials in the production of ketene dimer; on the other hand, burning the tail gas also consumes a part of energy, which further causes energy consumption of tail gas treatment, increases production cost and increases environmental burden. Therefore, how to reasonably utilize the tail gas generated in the diketene production, efficiently recover the effective components in the tail gas, reasonably utilize the recovered tail gas components, exert the economic value of the tail gas components and reduce the energy loss in the diketene production process becomes an urgent problem to be solved.
The present invention has been made in view of this situation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a tail gas recovery system in diketene production, the tail gas recovery system in diketene production introduced by the invention can efficiently recover effective components in tail gas, the recovered product can continuously exert the economic value, and the tail gas recovery system in diketene production can reduce the energy consumption in the tail gas treatment process to a greater extent.
In order to solve the technical problems, the invention adopts the technical scheme that:
a tail gas recovery system in diketene production comprises:
the tail gas source is used for collecting the tail gas generated by the diketene production system and guiding the flow direction of the tail gas;
the tail gas absorption equipment is used for providing a place for absorbing tail gas for the absorption medium and is communicated with the tail gas source; receiving the off-gas flowing from the off-gas source.
And the tail gas absorption product receiving equipment is connected with the tail gas absorption equipment and is mainly used for receiving and/or storing the tail gas absorption products generated in the tail gas absorption equipment.
The invention is further configured to: and the tail gas absorption product receiving equipment guides the tail gas absorption product collected in the tail gas absorption equipment into the tail gas absorption equipment to serve as the absorption medium, and the tail gas is continuously absorbed.
Preferably, the tail gas recovery system in the ketene dimer production comprises a tail gas absorption product circulating device, which is used for introducing the tail gas absorption product in the tail gas absorption product receiving device into the tail gas absorption device, and the tail gas absorption product circulating device is respectively connected with the tail gas absorption device and the tail gas absorption product receiving device;
further preferably, said off-gas absorption product recycle apparatus is connected to said off-gas absorption apparatus at an upper portion thereof;
still further preferably, said tail gas absorption product recycle means is connected to said tail gas absorption product receiving means at a lower portion/bottom thereof;
still further preferably, the tail gas absorption product recycling apparatus includes a line for conducting the tail gas absorption product.
The invention is further configured to: the number of the tail gas absorption product receiving devices is at least two;
preferably, the absorption media contained in the at least two tail gas absorption product receiving devices are different, so as to obtain different products;
further preferably, when the concentration and/or the type and/or the amount of the product contained in the at least two tail gas absorption product receiving devices reach a certain degree, the at least two tail gas absorption product receiving devices perform evacuation operation on the product and fill new absorption medium and/or adjust the connection relationship between the product and the tail gas absorption device, so as to change the concentration and/or the type and/or the amount of the absorption medium in the tail gas absorption device, thereby obtaining other products.
The invention is further configured to: the tail gas absorption equipment comprises:
the feeding device is used for guiding the tail gas into the tail gas absorption equipment and is connected with the tail gas source;
the discharging device is used for guiding out a tail gas absorption product generated in the tail gas absorption equipment and is communicated with the tail gas absorption product receiving equipment;
the gas outlet device is used for leading out the incompletely absorbed tail gas in the tail gas absorption equipment;
preferably, the tail gas absorption equipment further comprises an absorption medium introduction device for introducing an absorption medium for absorbing the tail gas into the tail gas absorption equipment;
further preferably, the absorption medium introduction device is communicated with the tail gas absorption product circulation equipment;
further preferably, the feeding device is arranged at the lower part of the tail gas absorption equipment;
further preferably, the discharging device is arranged at the bottom of the tail gas absorption equipment;
still further preferably, the gas outlet device is arranged at the top of the tail gas absorption equipment.
The invention is further configured to: the tail gas absorption product receiving equipment comprises a feed inlet, and the feed inlet is used for guiding the tail gas absorption product generated by the tail gas absorption equipment into the tail gas absorption product receiving equipment and is connected with the tail gas absorption equipment;
preferably, the tail gas absorption product receiving equipment further comprises a circulation port, and the circulation port is connected with the tail gas absorption equipment through the tail gas absorption product circulation equipment and is used for guiding the tail gas absorption product stored in the tail gas absorption product receiving equipment into the tail gas absorption equipment to serve as an absorption medium;
preferably, the feed inlet is arranged at the top of the tail gas absorption product receiving device;
further preferably, the feed inlet is connected with the discharge device;
still further preferably, the circulation port is provided at a lower portion of the tail gas absorption product receiving apparatus;
still further preferably, the tail gas recovery system comprises a gas phase equilibrium device, which communicates the tail gas absorption device with the tail gas absorption product receiving device, balances the gas pressure therebetween and enables a certain amount of gas phase material exchange; still further preferably, the vapor phase equalizing apparatus communicates a top of the tail gas absorbing apparatus with a top of the tail gas absorption product receiving apparatus.
The invention is further configured to: the number of the tail gas absorption devices is at least two, and the at least two tail gas absorption devices are connected in series and/or in parallel, so that tail gas in the tail gas source sequentially passes through the at least two tail gas absorption devices, and products flowing out of each tail gas absorption device are different;
preferably, the type and/or concentration of the product flowing out of each tail gas absorption device are different, so that different products can be obtained through a set of tail gas recovery system;
preferably, the tail gas absorption equipment comprises a primary tail gas absorption equipment and a secondary tail gas absorption equipment which are connected in series;
further preferably, the primary tail gas absorption device is directly connected with the tail gas source;
still further preferably, the gas outlet device of the primary tail gas absorption equipment is communicated with the feeding device of the secondary tail gas absorption equipment;
still further preferably, the absorption media introduced into the at least two tail gas absorption devices are different, and thus the products discharged from different tail gas absorption devices are different.
The invention is further configured to: the number of the tail gas absorption product receiving equipment is at least two, and the at least two tail gas absorption product receiving equipment and the at least two tail gas absorption equipment are arranged in a one-to-one correspondence manner;
preferably, the tail gas absorption product receiving equipment comprises primary tail gas absorption product receiving equipment and secondary tail gas absorption product receiving equipment which are respectively arranged in one-to-one correspondence with the primary tail gas absorption equipment and the secondary tail gas absorption equipment;
further preferably, the at least two tail gas absorption product receiving facilities are identical in structure;
still further preferably, the number of the tail gas absorption product circulating devices is at least two, and the at least two tail gas absorption product circulating devices and the at least two tail gas absorption devices are arranged in a one-to-one correspondence manner;
still further preferably, the tail gas absorption product circulating equipment comprises primary tail gas absorption product circulating equipment and secondary tail gas absorption product circulating equipment, which are respectively arranged in one-to-one correspondence with the primary tail gas absorption equipment and the secondary tail gas absorption equipment.
The invention is further configured to: the tail gas treatment device is communicated with the tail gas absorption device and is used for treating tail gas which cannot be completely treated by the tail gas absorption device;
preferably, the residual gas treatment equipment is communicated with the gas outlet device;
further preferably, the residual gas treatment equipment is communicated with a gas outlet device of the secondary tail gas absorption equipment;
still further preferably, the residual gas treatment apparatus is an incineration apparatus.
The invention is further configured to: comprising condensing means for cooling said absorbing medium prior to entry into said tail gas absorbing means;
preferably, the condensing means is connected to the off-gas absorption product recycle means to cool the absorption medium flowing through the off-gas absorption product recycle means.
The invention is further configured to: comprises a detection device for detecting the content of the substance in the absorption medium;
preferably, when the detection device detects that the content of the substance in the absorption medium reaches a target value, the tail gas absorption product receiving device is replaced;
further preferably, the detection device is connected to the tail gas absorption product circulation device, and detects the absorption medium in the tail gas absorption product circulation device;
still further preferably, when the detection device detects that the content of the absorbing medium in the primary tail gas absorbing product circulating device reaches a target value, the primary tail gas absorbing product receiving device is emptied of the substances, a certain amount of desalted water is filled in the primary tail gas absorbing product receiving device to be connected to the secondary tail gas absorbing device, and the secondary tail gas absorbing product receiving device together with the substances therein is connected to the primary tail gas absorbing device.
The invention is further configured to: the temperature in the tail gas absorption equipment is less than or equal to 50 ℃;
preferably, the tail gas recovery system in the diketene production is used for absorbing ketene in the tail gas.
After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects.
1. By the tail gas recovery system in the diketene production, the tail gas generated in the diketene production is recovered, the utilization rate of effective components in the tail gas is improved, and the loss of the effective components is reduced; furthermore, the technical scheme introduced by the invention can be used for recovering the tail gas to a greater extent, so that the emission of the tail gas which cannot be recovered is reduced, and the energy consumption is reduced to a greater extent when the part of the tail gas which cannot be recovered is incinerated or treated in other forms, thereby realizing the effects of energy conservation and environmental protection; furthermore, by adopting the technical scheme introduced by the invention, the components in the recovered tail gas can be used as raw materials or auxiliary materials for other production, secondary production is realized by utilizing the tail gas, and the overall economic benefit brought by the production of the diketene is improved;
2. the tail gas recovery system introduced by the invention has the advantages of flexible structure and connection relation and strong practicability. The technical scheme of the invention can be applied to the diketene production process as long as a device capable of collecting tail gas exists, namely, the tail gas recovery system introduced in the invention is an independent system, the conditions of a diketene production line matched with the tail gas recovery system are not limited, and the application range of the technical scheme of the invention is greatly expanded;
3. according to the tail gas recovery system in the diketene production, which is introduced by the invention, circulation is established between the tail gas absorption equipment and the tail gas absorption product receiving equipment, and the absorption medium discharged from the tail gas absorption equipment circulates between the tail gas absorption equipment and the tail gas absorption product receiving equipment for multiple times and repeatedly, so that the absorption rate of the absorption medium on effective components in the tail gas is increased, and simultaneously, the substance content in the absorption medium is concentrated, the effective components in the absorption medium are continuously enriched, the quality of the absorption product is increased, and the economic value is further improved;
4. according to the tail gas recovery system in the diketene production, provided by the invention, the circulating speed and flow are adjusted and controlled between the tail gas absorption equipment and the tail gas absorption product receiving equipment through the tail gas absorption product circulating equipment, so that a user can realize the integral control of the working condition of the tail gas recovery system through controlling the tail gas absorption product circulating equipment. For example, when a user has special requirements on the quality, concentration and yield of the tail gas absorption product, the quality, concentration and yield of the product can be controlled by controlling the tail gas absorption product circulation equipment;
5. through the tail gas recovery system in diketene production introduced by the invention, the positions of the materials entering and exiting the tail gas absorption equipment, the tail gas absorption product receiving equipment and the tail gas absorption product circulating equipment and the connection matching relationship among the equipment are limited, so that the materials flow more smoothly among the equipment, the materials can be ensured to be fully contacted with the absorption medium, and the absorption efficiency of the absorption medium on the materials is improved. The design of each material inlet and outlet (in-out equipment) of the tail gas absorption equipment fully considers that tail gas enters from the lower part of the tail gas absorption equipment and rises along the extending direction of the equipment, the absorption medium sprays downwards at the top of the tail gas absorption equipment, the movement directions of the absorption medium and the tail gas absorption equipment are opposite, and the absorption medium and the tail gas absorption equipment are fully contacted in the relative movement process, so that effective substances in the tail gas are absorbed. Furthermore, the absorption medium (tail gas absorption product) is sucked out from the part below the tail gas absorption product receiving equipment and circulated into the tail gas absorption equipment, so that the requirement of the absorption medium on circulating absorption in a system is met, the gas in the tail gas absorption product receiving equipment is prevented from being sucked into the tail gas absorption equipment to influence the circulation of the material (absorption medium), and the fluency of material circulation among the tail gas absorption equipment, the tail gas absorption product receiving equipment and the tail gas absorption product circulating equipment can be further ensured;
6. the tail gas recovery system in the diketene production introduced by the invention is additionally provided with the gas phase balancing equipment which communicates the gas phase part between the tail gas absorption equipment and the tail gas absorption product receiving equipment. On one hand, the two devices are in a connection relation, so that air pressure change is difficult to avoid when materials are circulated between the two devices, and the smoothness of material circulation is easy to cause; on the other hand, the design enables the tail gas absorption equipment and the tail gas absorption product receiving equipment to perform liquid phase circulation and simultaneously perform gas phase exchange to a certain extent, the absorption medium absorbing effective substances in the tail gas is stored in the tail gas absorption product receiving equipment and simultaneously avoids the reverse reaction of absorption, so that the absorbed effective components of the tail gas return to the gas phase again, the gas phase balance equipment recharges the tail gas separated out by the part into the tail gas absorption equipment, and the tail gas separated out by the part can be absorbed again for utilization or flows into the next tail gas absorption equipment to be absorbed continuously;
7. according to the tail gas recovery system in the diketene production, the connection relation and the connection position between the gas phase balance equipment and the tail gas absorption equipment and between the gas phase balance equipment and the tail gas absorption product receiving equipment are limited, so that a liquid phase part in the tail gas absorption equipment cannot flow into the tail gas absorption product receiving equipment, and after all, the liquid phase in the tail gas absorption equipment is still in a tail gas absorption stage, wherein the content of effective components is low, and at the moment, the absorption efficiency of an absorption medium is obviously reduced by introducing the liquid phase into the tail gas absorption product receiving equipment, the product concentration in the tail gas absorption product receiving equipment is reduced, and the tail gas absorption is not facilitated;
8. the tail gas recovery system in the diketene production introduced by the invention is provided with at least two sets of absorption units based on tail gas absorption equipment, and the two sets of absorption units are connected in series. When the tail gas passes through the primary tail gas absorption equipment, the effective components contained in the tail gas are absorbed to a certain degree; then the tail gas passes through a secondary tail gas absorption device, and the effective components contained in the tail gas are further absorbed, so that the absorption effect of the effective components in the tail gas is further improved, and the utilization rate of a tail gas recovery system to the tail gas is increased;
9. according to the tail gas recovery system in the diketene production, the primary tail gas absorption equipment and the secondary tail gas absorption equipment can share one set of tail gas absorption product receiving equipment and/or tail gas absorption product circulating equipment, so that the absorption rate of the system to tail gas is improved, the connection burden of the equipment is reduced, and parts required by the operation of the system are reduced;
10. through the tail gas recovery system in the diketene production introduced by the invention, the primary tail gas absorption equipment and the secondary tail gas absorption equipment can respectively correspond to a set of tail gas absorption product receiving equipment and/or tail gas absorption product circulating equipment, so that the tail gas absorption product with higher concentration can be obtained in the primary tail gas absorption product receiving equipment corresponding to the primary tail gas absorption equipment, and the tail gas absorption product with lower concentration can be obtained in the secondary tail gas absorption product receiving equipment corresponding to the secondary tail gas absorption equipment;
11. the tail gas recovery system introduced by the invention can absorb effective components in the tail gas to a greater extent, and particularly has an obvious recovery effect on ketene gas contained in the tail gas formed in the diketene production. Aiming at the recovery of ketene, desalted water can be sprayed into a tail gas absorption device as an absorption medium, dilute acetic acid is firstly generated by absorption of the desalted water on the ketene, and the dilute acetic acid is contacted with tail gas in the tail gas absorption device for many times under the action of a tail gas absorption product circulation device to generate acetic acid with a certain concentration. When the concentration of acetic acid in the absorption medium reaches a certain level, ketene and acetic acid mix to form an anhydride. The acid anhydride has higher economic value, and when the content of the acid anhydride in the absorption medium reaches a certain degree, the absorption product can be used as a product;
12. according to the tail gas recovery system in the diketene production, the primary tail gas absorption product receiving equipment and the secondary tail gas absorption product receiving equipment are set to be of the same structure, so that the primary tail gas absorption product receiving equipment and the secondary tail gas absorption product receiving equipment can be used interchangeably. When the content of acetic acid in the secondary tail gas absorption product receiving equipment reaches a certain degree, the secondary tail gas absorption product receiving equipment replaces the primary tail gas absorption product receiving equipment to be used for producing acid anhydride; the original primary tail gas absorption product receiving equipment is emptied, and a certain amount of desalted water is filled into the primary tail gas absorption product receiving equipment and is arranged at the position of the original secondary tail gas absorption product receiving equipment to play the function of the original secondary tail gas absorption product receiving equipment and be used for producing dilute acetic acid. The two tail gas absorption product receiving devices are recycled, so that the tail gas absorption efficiency of the system is improved, and the yield of the acid anhydride is ensured;
13. the tail gas recovery system in the diketene production introduced by the invention is additionally provided with a condensing device for cooling the absorption medium. The temperature of the tail gas is high, the tail gas can be effectively reduced by contacting the tail gas with the absorption medium with low temperature, the separation of effective components in the tail gas is facilitated, and the separation of the effective components, especially ketene, is improved. In addition, the cooling medium with lower temperature can also effectively prevent the absorbed tail gas components from being re-gasified and returning to the gas phase, thereby avoiding reverse reaction;
14. according to the tail gas recovery system in the diketene production, the condensing equipment is connected with the tail gas absorption product circulating equipment, so that the absorption medium flows through the tail gas absorption product circulating equipment and is cooled in time before entering the tail gas absorption equipment, the absorption medium entering the tail gas absorption equipment is still kept at a lower temperature, and the cooled absorption medium is not heated again due to an overlong circulating path;
15. according to the tail gas recovery system in the diketene production, which is introduced by the invention, the detection equipment is added for detecting the content of substances in the absorption medium, so that when the system runs, a user can timely and accurately obtain the absorption condition of the system on the tail gas and master the time for replacing the absorption medium.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic diagram of a tail gas recovery system in the production of diketene in one embodiment of the present invention;
FIG. 2 is a schematic diagram of a tail gas recovery system in the production of diketene in one embodiment of the invention.
In the figure: 1. a tail gas source; 2. a tail gas absorption device; 2a, primary tail gas absorption equipment; 2b, secondary tail gas absorption equipment; 21. a feeding device; 21a, a feeding device of a primary tail gas absorption device; 21b, a feeding device of a secondary tail gas absorption device; 22. a discharging device; 22a, a discharging device of the primary tail gas absorption equipment; 23. an air outlet device; 23a, an air outlet device of the primary tail gas absorption equipment; 23b, an air outlet device of the secondary tail gas absorption equipment; 3. a tail gas absorption product receiving device; 3a, primary tail gas absorption product receiving equipment; 3b, secondary tail gas absorption product receiving equipment; 31. a feed inlet of a tail gas absorption product receiving device; 31a, a feed inlet of a primary tail gas absorption product receiving device; 31b, a feed inlet of a secondary tail gas absorption product receiving device; 32. a circulation port; 32a, a circulation port of a primary tail gas absorption product receiving device; 32b, a circulation port of a secondary tail gas absorption product receiving device; 4. a tail gas absorption product recycling device; 4a, primary tail gas absorption product circulating equipment; 4b, secondary tail gas absorption product circulating equipment; 5. a gas phase balancing device; 5a, primary gas phase balancing equipment; 5b, secondary gas phase balancing equipment; 6. a residual gas treatment device; 7. a condensing device; 7a, primary condensing equipment; 7b, secondary condensation equipment; 8. a detection device; 8a, primary detection equipment; 8b, secondary detection equipment; 9. and (4) supplementing equipment with desalted water.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention introduces a tail gas recovery system in diketene production, which comprises: the tail gas source is used for collecting the tail gas generated by the diketene production system and guiding the flow direction of the tail gas; and the tail gas absorption equipment is used for providing a place for absorbing tail gas for the absorption medium, is communicated with the tail gas source and receives the tail gas flowing out of the tail gas source. And the tail gas absorption product receiving equipment is connected with the tail gas absorption equipment and is mainly used for receiving and/or storing the tail gas absorption products generated in the tail gas absorption equipment.
By the tail gas recovery system in the diketene production, the tail gas generated in the diketene production is recovered, the utilization rate of effective components in the tail gas is improved, and the loss of the effective components is reduced; furthermore, the technical scheme introduced by the invention can be used for recovering the tail gas to a greater extent, so that the emission of the tail gas which cannot be recovered is reduced, and the energy consumption is reduced to a greater extent when the part of the tail gas which cannot be recovered is incinerated or treated in other forms, thereby realizing the effects of energy conservation and environmental protection; furthermore, by adopting the technical scheme introduced by the invention, the components in the recovered tail gas can be used as raw materials or auxiliary materials for other production, secondary production is realized by utilizing the tail gas, and the overall economic benefit brought by the diketene production is improved. In addition, the tail gas recovery system in the diketene production introduced by the invention has flexible structure and connection relation and strong practicability. The technical scheme of the invention can be applied to the diketene production process as long as a device capable of collecting tail gas exists, namely, the tail gas recovery system introduced in the invention is an independent system, the conditions of a diketene production line matched with the tail gas recovery system are not limited, and the application range of the technical scheme of the invention is greatly expanded.
Example one
As shown in fig. 1, in the tail gas recovery system in diketene production in this embodiment, the tail gas absorption product receiving device introduces the tail gas absorption product collected therein into the tail gas absorption device 2 to serve as an absorption medium, and the tail gas absorption device 2 continues to absorb the tail gas. Through the tail gas recovery system in diketene production that this embodiment introduced, establish the circulation between tail gas absorption equipment 2 and tail gas absorption product receiving equipment 3, exhaust absorption medium is many times among the tail gas absorption equipment 2, the repeated circulation between tail gas absorption equipment 2 and tail gas absorption product receiving equipment 3, when increasing the absorption rate of absorption medium to active ingredient in the tail gas, play the effect of concentrating to the material content in the absorption medium, make the active ingredient constantly enrichment in the absorption medium, the quality of absorption product has been increased, and then economic value has been improved. In addition, the use of the absorption medium can be reduced by a circulating absorption method, and the waste of the raw material absorption medium is avoided.
Further, the tail gas recovery system in the diketene production in this embodiment includes a tail gas absorption product circulation device 4, which is used to introduce the tail gas absorption product in the tail gas absorption product receiving device 3 into the tail gas absorption device 3, and the tail gas absorption product circulation device 4 is connected to the tail gas absorption device 2 and the tail gas absorption product receiving device 3, respectively. Through the tail gas recovery system in diketene production introduced in this embodiment, the rate and the flow of circulation are adjusted and controlled by the tail gas absorption product circulation equipment between the tail gas absorption equipment and the tail gas absorption product receiving equipment, and then the user can realize the overall control of the working condition of the tail gas recovery system by controlling the tail gas absorption product circulation equipment. For example, when a user has special requirements on the quality, concentration and yield of the tail gas absorption product, the quality, concentration and yield of the product can be controlled by controlling the tail gas absorption product circulation equipment.
Further, the off-gas absorption product recycling apparatus 4 in this embodiment is connected to the off-gas absorption apparatus 2 at an upper portion thereof. The off-gas absorption product recycling means 4 is connected to the off-gas absorption product receiving means 3 at the lower part/bottom thereof. Further, the exhaust gas absorption product circulation device 4 includes a pipe for conducting the exhaust gas absorption product. Through the tail gas recovery system in the diketene production that this embodiment introduced, the position and the connection cooperation relation between each equipment of each material business turn over tail gas absorption equipment, tail gas absorption product receiving equipment, tail gas absorption product circulating equipment have been injectd for the material flows more smoothly between each equipment, can guarantee fully to contact between material and the absorption medium moreover, improves the absorption efficiency of absorption medium to the material.
Example two
As shown in fig. 1, the tail gas recovery system in diketene production in this example is different from the above example in that: the tail gas absorption apparatus 2 includes: and the feeding device 21 is used for guiding the tail gas into the tail gas absorption equipment 2 and is connected with the tail gas source 1. And the discharging device 22 is used for guiding out the tail gas absorption product generated in the tail gas absorption equipment 2 and is communicated with the tail gas absorption product receiving equipment 3. And the gas outlet device 23 is used for leading out the incompletely absorbed tail gas in the tail gas absorption equipment 2.
Further, the tail gas absorption equipment 2 in this embodiment further includes an absorption medium introducing device, and the absorption medium for absorbing tail gas is introduced into the tail gas absorption equipment 2, and the absorption medium introducing device is communicated with the tail gas absorption product circulating equipment 3, and the feeding device 21 is disposed at the lower portion of the tail gas absorption equipment 2, and the discharging device 22 is disposed at the bottom of the tail gas absorption equipment 2, and the gas outlet device 23 is disposed at the top of the tail gas absorption equipment 2.
Further, the tail gas absorption product receiving device 3 in this embodiment includes a feeding port 31, and the feeding port 31 is used for guiding the tail gas absorption product generated by the tail gas absorption device 2 into the tail gas absorption product receiving device 3, and is connected to the tail gas absorption device 2.
Preferably, the tail gas absorption product receiving device 3 further comprises a circulation port 32, and the circulation port 32 is connected to the tail gas absorption device 3 through the tail gas absorption product circulation device 4, and is used for guiding the tail gas absorption product stored in the tail gas absorption product receiving device 3 into the tail gas absorption device 2 to serve as an absorption medium. Preferably, the feeding port 31 is disposed at the top of the tail gas absorption product receiving device 3, the feeding port 31 is connected with the discharging device 22, and the circulation port 32 is disposed at the lower part of the tail gas absorption product receiving device 3. Through the tail gas recovery system in diketene production introduced by this embodiment, the design of each material inlet and outlet (access device) of tail gas absorption equipment fully considers that tail gas enters from the lower part of the tail gas absorption equipment and rises along the extending direction of the equipment, and the absorption medium sprays downwards at the top of the tail gas absorption equipment, the moving directions of the tail gas absorption equipment and the tail gas absorption equipment are opposite, and sufficient contact occurs in the relative movement process of the tail gas absorption equipment and effective substances in the tail gas are absorbed. Further, with absorbing medium (tail gas absorption product) from the partial suction circulation of examining the downside of tail gas absorption product receiving equipment to tail gas absorption equipment, satisfied absorbing medium in the absorptive demand of system circulation on the one hand, on the other hand can avoid the gas in the tail gas absorption product receiving equipment to be inhaled and influence the circulation of material (absorbing medium) in the tail gas absorption equipment, also can further guarantee the smoothness nature of material circulation between tail gas absorption equipment, tail gas absorption product receiving equipment, the tail gas absorption product circulating equipment three.
EXAMPLE III
As shown in fig. 1, the tail gas recovery system in diketene production in this example is different from the above example in that: the tail gas recovery system comprises a gas phase balance device 5, the gas phase balance device 5 is used for communicating the tail gas absorption device 2 with the tail gas absorption product receiving device 3, balancing the gas pressure between the tail gas absorption device 2 and the tail gas absorption product receiving device, and performing a certain amount of gas phase substance exchange; further, the gas phase equalizing apparatus 5 communicates the top of the off-gas absorbing apparatus 2 with the top of the off-gas absorption product receiving apparatus 3. Preferably, the gas phase equilibrium device 5 comprises a pipe structure allowing the passage of gas.
Through the tail gas recovery system in diketene production introduced in this embodiment, a gas phase balance device is added, and the gas phase balance device communicates the gas phase part between the tail gas absorption device and the tail gas absorption product receiving device. On one hand, the two devices are in a connection relation, so that air pressure change is difficult to avoid when materials are circulated between the two devices, and the smoothness of material circulation is easy to cause; on the other hand, the design enables the tail gas absorption equipment and the tail gas absorption product receiving equipment to carry out liquid phase circulation and simultaneously carry out gas phase exchange to a certain extent, the absorption medium absorbing effective substances in the tail gas is stored in the tail gas absorption product receiving equipment and simultaneously avoids the reverse reaction of absorption, so that the absorbed effective components of the tail gas return to the gas phase again, the gas phase balance equipment recharges the tail gas separated out by the part into the tail gas absorption equipment, and the tail gas separated out by the part can be absorbed and utilized again or flows into the next tail gas absorption equipment to be absorbed continuously. Further, the tail gas recovery system in diketene production introduced in this embodiment limits the connection relation and the connection position between the gas phase equilibrium device and the tail gas absorption device and between the gas phase equilibrium device and the tail gas absorption product receiving device, so that the liquid phase part in the tail gas absorption device does not flow into the tail gas absorption product receiving device, after all, the liquid phase in the tail gas absorption device is still in the stage of absorbing tail gas, wherein the content of the effective components is low, at this time, the introduction of the liquid phase into the tail gas absorption product receiving device will significantly reduce the absorption efficiency of the absorption medium, and reduce the product concentration in the tail gas absorption product receiving device, which is not favorable for tail gas absorption.
Example four
The difference between the tail gas recovery system in diketene production in this embodiment and the above embodiment is that: the quantity of tail gas absorption equipment is two, and two tail gas absorption equipment establish ties for tail gas in the tail gas source loops through two tail gas absorption equipment. Preferably, the tail gas absorption equipment comprises a primary tail gas absorption equipment and a secondary tail gas absorption equipment which are connected in series, the primary tail gas absorption equipment is directly connected with a tail gas source, and an air outlet device of the primary tail gas absorption equipment is communicated with a feeding device of the secondary tail gas absorption equipment.
The tail gas recovery system in the diketene production introduced in this embodiment is provided with at least two sets of absorption units based on the tail gas absorption equipment, and the two sets of absorption units are connected in series. When the tail gas passes through the primary tail gas absorption equipment, the effective components contained in the tail gas are absorbed to a certain degree; and then the tail gas passes through a secondary tail gas absorption device, and the contained effective components are further absorbed, so that the absorption effect of the effective components in the tail gas is further improved, and the utilization rate of a tail gas recovery system to the tail gas is increased. Furthermore, the primary tail gas absorption equipment and the secondary tail gas absorption equipment can share one set of tail gas absorption product receiving equipment and/or tail gas absorption product circulating equipment, so that the absorption rate of the system to the tail gas is improved, the connection burden of the equipment is reduced, and parts required by the operation of the system are reduced.
EXAMPLE five
As shown in fig. 2, the tail gas recovery system in diketene production in this example is different from the above examples in that: the number of the tail gas absorption product receiving devices is two, and the two tail gas absorption product receiving devices are arranged in one-to-one correspondence with the two tail gas absorption devices. The tail gas absorption product receiving equipment comprises primary tail gas absorption product receiving equipment 3a and secondary tail gas absorption product receiving equipment 3b which are respectively arranged in one-to-one correspondence with the primary tail gas absorption equipment 2a and the secondary tail gas absorption equipment 2 b. Preferably, the two off-gas absorption product receiving apparatuses are identical in structure.
Further, the number of the tail gas absorption product circulation devices in this embodiment is two, and the two tail gas absorption product circulation devices and the two tail gas absorption devices are arranged in one-to-one correspondence. The tail gas absorption product circulating equipment comprises primary tail gas absorption product circulating equipment 4a and secondary tail gas absorption product circulating equipment 4b which are respectively arranged in one-to-one correspondence with the primary tail gas absorption equipment 2a and the secondary tail gas absorption equipment 2 b.
Through the tail gas recovery system in diketene production introduced in this embodiment, a primary tail gas absorption device and a secondary tail gas absorption device can respectively correspond to a set of tail gas absorption product receiving device and/or a set of tail gas absorption product circulating device, so that a tail gas absorption product with a higher concentration can be obtained in the primary tail gas absorption product receiving device corresponding to the primary tail gas absorption device, and a tail gas absorption product with a lower concentration can be obtained in the secondary tail gas absorption product receiving device corresponding to the secondary tail gas absorption device.
Further, as shown in fig. 1 and fig. 2, the tail gas recovery system in diketene production in this embodiment includes a residual gas treatment device 6, where the residual gas treatment device 6 is communicated with the tail gas absorption device 2 or 2a, 2b, and is used for treating tail gas that cannot be completely treated by the tail gas absorption device. Preferably, the residual gas treatment equipment is communicated with the gas outlet device. Further preferably, the residual gas treatment device 6 is communicated with the gas outlet device 23b of the secondary tail gas absorption device. Further preferably, the residual gas treatment device 6 is an incineration device. Through the tail gas recovery system in diketene production introduced in this embodiment, after the tail gas is subjected to sufficient recovery treatment, the tail gas inevitably contains a certain amount of ketene, ethylene, methane and other substances, the substances are directly discharged into the atmosphere to cause environmental pollution, and the harm of the residual tail gas after recovery can be effectively reduced by carrying out incineration treatment on the substances.
EXAMPLE six
As shown in fig. 1 and fig. 2, the tail gas recovery system in diketene production in the present embodiment is different from the above embodiments in that: comprises a condensing device 7 or 7a and 7b used for cooling the absorbing medium before the absorbing medium enters the tail gas absorbing device, the condensing device is connected with the tail gas absorbing product circulating device, and the absorbing medium flowing through the tail gas absorbing product circulating device is cooled. Through the tail gas recovery system in diketene production introduced in this example, a condensing unit was added for cooling the absorbing medium. The temperature of the tail gas is high, the tail gas can be effectively reduced by contacting the tail gas with the absorption medium with low temperature, the separation of effective components in the tail gas is facilitated, and the separation of the effective components, especially ketene, is improved. And the cooling medium with lower temperature can also effectively prevent the absorbed tail gas components from being re-gasified and returning to the gas phase, thereby avoiding reverse reaction. Furthermore, the condensing equipment is connected with the tail gas absorption product circulating equipment, so that the absorption medium flows through the tail gas absorption product circulating equipment and is cooled in time before entering the tail gas absorption equipment, the absorption medium entering the tail gas absorption equipment is ensured to still keep a lower temperature, and the cooled absorption medium cannot be heated again due to an overlong circulating path.
EXAMPLE seven
As shown in fig. 1 and fig. 2, the tail gas recovery system in diketene production in the present embodiment is different from the above embodiments in that: comprising a detection device 8 or 8a, 8b for detecting the content of a substance in the absorption medium. The detection equipment is connected with the tail gas absorption product circulating equipment 4 or 4a and 4b to detect the absorption medium in the tail gas absorption product circulating equipment.
Further, when the detecting device in this embodiment detects that the content of the substance in the absorbing medium reaches the target value, the tail gas absorbing product receiving device is replaced.
Furthermore, when the detection device detects that the content of the substances in the absorption medium in the primary tail gas absorption product circulating device reaches a target value, the substances in the primary tail gas absorption product receiving device are emptied, a certain amount of desalted water is filled in the primary tail gas absorption product receiving device and connected to the secondary tail gas absorption device, and the secondary tail gas absorption product receiving device and the substances in the secondary tail gas absorption product receiving device are connected to the primary tail gas absorption device together. Preferably, the tail gas recovery system in diketene production is used to absorb ketene in the tail gas.
The tail gas recovery system in the diketene production introduced in the embodiment can absorb effective components in the tail gas to a greater extent, and particularly has an obvious recovery effect on ketene gas contained in the tail gas formed in the diketene production. Aiming at the recovery of ketene, desalted water can be sprayed into a tail gas absorption device as an absorption medium, dilute acetic acid is firstly generated by absorption of the desalted water on the ketene, and the dilute acetic acid is contacted with tail gas in the tail gas absorption device for many times under the action of a tail gas absorption product circulation device to generate acetic acid with a certain concentration. When the concentration of acetic acid in the absorption medium reaches a certain level, ketene and acetic acid mix to form an anhydride. The acid anhydride has higher economic value, and when the content of the acid anhydride in the absorption medium reaches a certain degree, the absorption product can be used as a product. The primary tail gas absorption product receiving equipment and the secondary tail gas absorption product receiving equipment are arranged to be of the same structure, so that the primary tail gas absorption product receiving equipment and the secondary tail gas absorption product receiving equipment can be used interchangeably. When the content of acetic acid in the secondary tail gas absorption product receiving equipment reaches a certain degree, the secondary tail gas absorption product receiving equipment replaces the primary tail gas absorption product receiving equipment to be used for producing acid anhydride; the original primary tail gas absorption product receiving equipment is emptied, and a certain amount of desalted water is filled into the primary tail gas absorption product receiving equipment and is arranged at the position of the original secondary tail gas absorption product receiving equipment to play the function of the original secondary tail gas absorption product receiving equipment and be used for producing dilute acetic acid. The two tail gas absorption product receiving devices are recycled, so that the absorption efficiency of the system on the tail gas is improved, and the yield of the acid anhydride is ensured.
Furthermore, the temperature in the tail gas absorption equipment in the embodiment is less than or equal to 50 ℃.
Through the tail gas recovery system in diketene production introduced in this embodiment, the recovery of effective components in the tail gas can be efficiently realized, the recovered product can continue to exert its economic value, and the tail gas recovery system in diketene production can reduce the energy consumption in the tail gas treatment process to a great extent.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A tail gas recovery system in diketene production is characterized by comprising:
the tail gas source is used for collecting the tail gas generated by the diketene production system and guiding the flow direction of the tail gas;
the tail gas absorption equipment is used for providing a place for absorbing tail gas for the absorption medium and is communicated with the tail gas source;
the tail gas absorption product receiving equipment is connected with the tail gas absorption equipment and is mainly used for receiving and/or storing the tail gas absorption product generated in the tail gas absorption equipment;
the tail gas absorption product circulating equipment is used for guiding the tail gas absorption product in the tail gas absorption product receiving equipment into the tail gas absorption equipment, and the tail gas absorption product circulating equipment is respectively connected with the tail gas absorption equipment and the tail gas absorption product receiving equipment;
and the gas phase balance equipment is used for communicating the tail gas absorption equipment with the tail gas absorption product receiving equipment, balancing the gas pressure between the tail gas absorption equipment and the tail gas absorption product receiving equipment and exchanging gas phase substances, and the gas phase balance equipment is used for communicating the top of the tail gas absorption equipment with the top of the tail gas absorption product receiving equipment.
2. The tail gas recovery system in the diketene production according to claim 1, wherein the tail gas absorption product receiving device introduces the tail gas absorption product collected therein into the tail gas absorption device to serve as the absorption medium;
the tail gas absorption product circulating equipment is connected with the tail gas absorption equipment at the upper part of the tail gas absorption equipment;
the tail gas absorption product recycling means is connected to the tail gas absorption product receiving means at a lower portion/bottom thereof.
3. The tail gas recovery system in the production of diketene according to claim 1 or 2, wherein the number of the tail gas absorption product receiving apparatuses is at least two;
the absorption media contained in the at least two tail gas absorption product receiving devices are different, so that different products are obtained;
when the concentration and/or the type and/or the amount of the products contained in the at least two tail gas absorption product receiving devices reach a certain degree, the tail gas absorption product receiving devices are emptied, filled with new absorption media and/or adjusted in connection relation, the connection relation between the tail gas absorption devices and the tail gas absorption devices is changed, and then the concentration and/or the type and/or the amount of the absorption media in the tail gas absorption devices are changed, so that other products are obtained.
4. The tail gas recovery system in diketene production according to claim 1 or 2, wherein the tail gas absorption apparatus comprises:
the feeding device is used for guiding the tail gas into the tail gas absorption equipment and is connected with the tail gas source;
the discharging device is used for guiding out a tail gas absorption product generated in the tail gas absorption equipment and is communicated with the tail gas absorption product receiving equipment;
the gas outlet device is used for leading out the incompletely absorbed tail gas in the tail gas absorption equipment;
the feeding device is arranged at the lower part of the tail gas absorption equipment;
the discharging device is arranged at the bottom of the tail gas absorption equipment;
the gas outlet device is arranged at the top of the tail gas absorption equipment.
5. The tail gas recovery system in the diketene production according to claim 4, wherein the tail gas absorption product receiving device comprises a feed inlet, and the feed inlet is used for introducing the tail gas absorption product generated by the tail gas absorption device into the tail gas absorption product receiving device and is connected with the tail gas absorption device;
the tail gas absorption product receiving equipment also comprises a circulating port, and the circulating port is connected with the tail gas absorption equipment through the tail gas absorption product circulating equipment and is used for guiding the tail gas absorption product stored in the tail gas absorption product receiving equipment into the tail gas absorption equipment to serve as an absorption medium;
the feed inlet is arranged at the top of the tail gas absorption product receiving equipment;
the feed inlet is connected with the discharge device;
the circulation port is arranged at the lower part of the tail gas absorption product receiving equipment.
6. The tail gas recovery system in diketene production according to claim 1 or 2, wherein the number of the tail gas absorption devices is at least two, and the at least two tail gas absorption devices are connected in series and/or in parallel, so that the tail gas in the tail gas source sequentially passes through the at least two tail gas absorption devices, and the product flowing out from each tail gas absorption device is different;
the type and/or concentration of products flowing out of each tail gas absorption device are different, and different products are obtained through a set of tail gas recovery system;
the tail gas absorption equipment comprises a primary tail gas absorption equipment and a secondary tail gas absorption equipment which are connected in series;
the primary tail gas absorption equipment is directly connected with the tail gas source;
the gas outlet device of the primary tail gas absorption equipment is communicated with the feeding device of the secondary tail gas absorption equipment;
the absorption media introduced into the at least two tail gas absorption devices are different, and then the products flowing out from different tail gas absorption devices are different.
7. The tail gas recovery system in diketene production according to claim 6, wherein the number of the tail gas absorption product receiving devices is at least two, and the at least two tail gas absorption product receiving devices are arranged in one-to-one correspondence with the at least two tail gas absorption devices;
the tail gas absorption product receiving equipment comprises primary tail gas absorption product receiving equipment and secondary tail gas absorption product receiving equipment which are respectively arranged in one-to-one correspondence with the primary tail gas absorption equipment and the secondary tail gas absorption equipment;
the at least two tail gas absorption product receiving devices have the same structure;
the number of the tail gas absorption product circulating devices is at least two, and the at least two tail gas absorption product circulating devices and the at least two tail gas absorption devices are arranged in a one-to-one correspondence manner;
the tail gas absorption product circulating equipment comprises primary tail gas absorption product circulating equipment and secondary tail gas absorption product circulating equipment, and the primary tail gas absorption equipment and the secondary tail gas absorption equipment are arranged in a one-to-one correspondence mode respectively.
8. The tail gas recovery system in diketene production according to claim 6, characterized by comprising a residual gas treatment device, wherein the residual gas treatment device is communicated with the tail gas absorption device and is used for treating tail gas which cannot be completely treated by the tail gas absorption device;
the residual gas treatment equipment is communicated with the gas outlet device;
the residual gas treatment equipment is communicated with a gas outlet device of the secondary tail gas absorption equipment;
the residual gas treatment equipment is incineration equipment.
9. The tail gas recovery system in the production of diketene according to claim 1 or 2, characterized by comprising a condensing device for cooling the absorbing medium before it enters the tail gas absorbing device;
the condensing equipment is connected with the tail gas absorption product circulating equipment and cools the absorption medium flowing through the tail gas absorption product circulating equipment.
10. The tail gas recovery system in diketene production according to claim 7, characterized by comprising a detection device for detecting the content of substances in the absorption medium;
when the detection device detects that the content of the substances in the absorption medium reaches a target value, the tail gas absorption product receiving device is replaced;
the detection equipment is connected with the tail gas absorption product circulating equipment and is used for detecting an absorption medium in the tail gas absorption product circulating equipment;
when the detection device detects that the content of the substances in the absorption medium in the primary tail gas absorption product circulation device reaches a target value, emptying the substances in the primary tail gas absorption product receiving device, filling a certain amount of desalted water to connect the desalted water to the secondary tail gas absorption device, and connecting the secondary tail gas absorption product receiving device and the substances in the secondary tail gas absorption product receiving device to the primary tail gas absorption device;
the temperature in the tail gas absorption equipment is less than or equal to 50 ℃;
the tail gas recovery system in the diketene production is used for absorbing ketene in tail gas.
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| CN101279180A (en) * | 2008-05-26 | 2008-10-08 | 中国蓝星（集团）总公司 | Method for improving exhaust air recovery tower efficiency and exhaust air recovery tower |
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