阅读说明：本技术 一种pta聚纺一体化工艺尾气利用系统 (PTA gathers spins integration technology tail gas utilization system ) 是由 沈富强 宋才华 李建新 徐宝桂 卞炳强 姚臻桂 于 2021-07-21 设计创作，主要内容包括：本发明公开了一种PTA聚纺一体化工艺尾气利用系统,包括PTA1氧化反应器、PTA2氧化反应器,所述PTA1氧化反应器和所述PTA2氧化反应器通过尾气输出管道连接于低压氮气缓冲罐；所述低压氮气缓冲罐的顶部设置有氮气输出管,所述氮气输出管连接有备用氮气输入管,所述备用氮气输入管的一端连接有所述公用液氮汽化器,所述公用液氮汽化器将汽化后的氮气输送至公用氮气缓冲罐,所述公用氮气缓冲罐通过所述备用氮气输入管连接于所述氮气输出管；本发明将公用液氮汽化器从常用变为备用,减少液氮购买量,有效的解决PTA生产过程中新鲜氮气使用量过大的问题,减少了生产成本,同时大大的增强了PTA生产装置的安全平稳运行。(The invention discloses a PTA poly-spinning integrated process tail gas utilization system, which comprises a PTA1 oxidation reactor and a PTA2 oxidation reactor, wherein the PTA1 oxidation reactor and the PTA2 oxidation reactor are connected with a low-pressure nitrogen buffer tank through a tail gas output pipeline; the top of the low-pressure nitrogen buffer tank is provided with a nitrogen output pipe, the nitrogen output pipe is connected with a standby nitrogen input pipe, one end of the standby nitrogen input pipe is connected with the public liquid nitrogen vaporizer, the public liquid nitrogen vaporizer delivers vaporized nitrogen to the public nitrogen buffer tank, and the public nitrogen buffer tank is connected with the nitrogen output pipe through the standby nitrogen input pipe; the invention changes the common liquid nitrogen vaporizer into the standby liquid nitrogen vaporizer from common use, reduces the purchase amount of liquid nitrogen, effectively solves the problem of overlarge consumption of fresh nitrogen in the PTA production process, reduces the production cost and greatly enhances the safe and stable operation of the PTA production device.)

1. The PTA poly-spinning integrated process tail gas utilization system is characterized in that: comprises a PTA1 oxidation reactor (1), a PTA2 oxidation reactor (2), a common liquid nitrogen vaporizer (3), a common nitrogen buffer tank (4), a nitrogen booster (5), a low-pressure nitrogen buffer tank (6) and a high-pressure nitrogen buffer tank (7); the tops of the PTA1 oxidation reactor (1) and the PTA2 oxidation reactor (2) are both provided with tail gas output pipelines (8); the PTA1 oxidation reactor (1) and the PTA2 oxidation reactor (2) are connected to the low pressure nitrogen buffer tank (6) through the tail gas output pipeline (8); the top of the low-pressure nitrogen buffer tank (6) is provided with a nitrogen output pipe (9), the nitrogen output pipe (9) is connected with a first nitrogen conveying pipeline (10) and a second nitrogen conveying pipeline (11), the nitrogen output pipe (9) is connected with a standby nitrogen input pipe (12), one end of the standby nitrogen input pipe (12) is connected with the public liquid nitrogen vaporizer (3), the public liquid nitrogen vaporizer (3) conveys vaporized nitrogen to the public nitrogen buffer tank (4), and the public nitrogen buffer tank (4) is connected to the nitrogen output pipe (9) through the standby nitrogen input pipe (12); the first nitrogen conveying pipeline (10) is respectively connected with a low-pressure poly-spinning user point (13) and a low-pressure PTA user point (14); second nitrogen conveying pipeline (11) connect in nitrogen booster compressor (5), nitrogen booster compressor (5) carry the nitrogen gas after the pressure boost to high-pressure nitrogen buffer tank (7), high-pressure nitrogen buffer tank (7) are connected high pressure and are gathered spinning user point (15) and high-pressure PTA user point (16).

2. The PTA poly-spinning integrated process tail gas utilization system of claim 1, which is characterized in that: the inside of PTA1 oxidation reactor (1) and PTA2 oxidation reactor (2) all is provided with agitator (17), agitator (17) are connected with driving motor (18).

3. The PTA poly-spinning integrated process tail gas utilization system of claim 1, which is characterized in that: the pressure range of the low-pressure nitrogen buffer tank (6) is 0.7-0.8 Mpa.

4. The PTA poly-spinning integrated process tail gas utilization system of claim 1, which is characterized in that: the pressure range of the high-pressure nitrogen buffer tank (7) is 2.0-2.2 Mpa.

5. The PTA poly-spinning integrated process tail gas utilization system of claim 1, which is characterized in that: the public liquid nitrogen vaporizer (3) is an air temperature vaporizer or a water bath vaporizer.

Technical Field

The invention relates to the technical field of PTA production devices, in particular to a PTA poly-spinning integrated process tail gas utilization system.

Background

Nitrogen is inert in chemical property and difficult to react with other substances at normal temperature. Therefore, the method is commonly used for system replacement, powder conveying, equipment purging, storage tank, pipeline sealing protection, bulk powder particle inflation protection and the like in the chemical field. Nitrogen gas for poly spinning is generally purchased liquid nitrogen, gasified by a liquid nitrogen vaporizer and then conveyed to a high-pressure buffer tank, a low-pressure buffer tank and a pipe network. And for enterprises with large capacity, the method is not economical enough, so that the production cost is increased, and the method needs to monitor and supplement liquid nitrogen in real time to prevent insufficient consumption and prevent influence on the production stability.

Based on the situation, the invention provides a PTA poly-spinning integrated process tail gas utilization system, which can effectively solve the problems.

Disclosure of Invention

The invention aims to provide a PTA poly-spinning integrated process tail gas utilization system. The PTA poly-spinning integrated process tail gas utilization system provided by the invention has a simple structure, changes a common liquid nitrogen vaporizer into a standby liquid nitrogen vaporizer from a common use, reduces the purchase amount of liquid nitrogen, effectively solves the problem of overlarge use amount of fresh nitrogen in the PTA production process, reduces the production cost, and greatly enhances the safe and stable operation of a PTA production device. And secondly, the service frequency of instruments related to the liquid nitrogen device is reduced, the service life of the instruments is prolonged, and the public consumption of water, electricity, gas and the like is reduced, so that the operation cost of the equipment is reduced.

The invention is realized by the following technical scheme:

a PTA poly-spinning integrated process tail gas utilization system comprises a PTA1 oxidation reactor, a PTA2 oxidation reactor, a common liquid nitrogen vaporizer, a common nitrogen buffer tank, a nitrogen booster, a low-pressure nitrogen buffer tank and a high-pressure nitrogen buffer tank; the tops of the PTA1 oxidation reactor and the PTA2 oxidation reactor are both provided with tail gas output pipelines; the PTA1 oxidation reactor and the PTA2 oxidation reactor are connected to the low-pressure nitrogen buffer tank through the tail gas output pipeline; the top of the low-pressure nitrogen buffer tank is provided with a nitrogen output pipe, the nitrogen output pipe is connected with a first nitrogen conveying pipeline and a second nitrogen conveying pipeline, the nitrogen output pipe is connected with a standby nitrogen input pipe, one end of the standby nitrogen input pipe is connected with the public liquid nitrogen vaporizer, the public liquid nitrogen vaporizer delivers vaporized nitrogen to the public nitrogen buffer tank, and the public nitrogen buffer tank is connected with the nitrogen output pipe through the standby nitrogen input pipe; the first nitrogen conveying pipeline is respectively connected with a low-pressure poly-spinning user point and a low-pressure PTA user point; the second nitrogen gas conveying pipeline is connected with the nitrogen booster, the nitrogen booster conveys the nitrogen after being boosted to the high-pressure nitrogen buffer tank, and the high-pressure nitrogen buffer tank is connected with a high-pressure poly-spinning user point and a high-pressure PTA user point.

According to the above technical solution, as a further preferable technical solution of the above technical solution, stirrers are provided inside the PTA1 oxidation reactor and the PTA2 oxidation reactor, and the stirrers are connected with a driving motor.

According to the technical scheme, as a further preferable technical scheme of the technical scheme, the pressure range of the low-pressure nitrogen buffer tank is 0.7-0.8 MPa.

According to the technical scheme, as a further preferable technical scheme of the technical scheme, the pressure range of the high-pressure nitrogen buffer tank is 2.0-2.2 MPa.

According to the above technical means, as a further preferable technical means of the above technical means, the common liquid nitrogen vaporizer is an air temperature vaporizer or a water bath vaporizer.

Compared with the prior art, the invention has the following advantages and beneficial effects:

the PTA poly-spinning integrated process tail gas utilization system provided by the invention has a simple structure, changes a common liquid nitrogen vaporizer into a standby liquid nitrogen vaporizer from a common use, reduces the purchase amount of liquid nitrogen, effectively solves the problem of overlarge use amount of fresh nitrogen in the PTA production process, reduces the production cost, and greatly enhances the safe and stable operation of a PTA production device. And secondly, the service frequency of instruments related to the liquid nitrogen device is reduced, the service life of the instruments is prolonged, and the public consumption of water, electricity, gas and the like is reduced, so that the operation cost of the equipment is reduced.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Detailed Description

In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in conjunction with specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

The technical features of the nitrogen booster and the like in the present invention are obtained from conventional commercial sources or prepared by conventional methods unless otherwise specified, and the specific structure, the operation principle, the control mode and the spatial arrangement mode which may be involved are all conventional choices in the field, which should not be regarded as the innovation point of the present invention, and it is understood by those skilled in the art that the present invention is not further specifically described in detail.

Example 1:

a PTA poly-spinning integrated process tail gas utilization system comprises a PTA1 oxidation reactor 1, a PTA2 oxidation reactor 2, a common liquid nitrogen vaporizer 3, a common nitrogen buffer tank 4, a nitrogen booster 5, a low-pressure nitrogen buffer tank 6 and a high-pressure nitrogen buffer tank 7; the tops of the PTA1 oxidation reactor 1 and the PTA2 oxidation reactor 2 are both provided with tail gas output pipelines 8; the PTA1 oxidation reactor 1 and the PTA2 oxidation reactor 2 are connected to the low pressure nitrogen buffer tank 6 through the tail gas output pipeline 8; a nitrogen gas output pipe 9 is arranged at the top of the low-pressure nitrogen buffer tank 6, the nitrogen gas output pipe 9 is connected with a first nitrogen gas conveying pipeline 10 and a second nitrogen gas conveying pipeline 11, the nitrogen gas output pipe 9 is connected with a standby nitrogen gas input pipe 12, one end of the standby nitrogen gas input pipe 12 is connected with the public liquid nitrogen vaporizer 3, the public liquid nitrogen vaporizer 3 conveys vaporized nitrogen gas to the public nitrogen buffer tank 4, and the public nitrogen buffer tank 4 is connected to the nitrogen gas output pipe 9 through the standby nitrogen gas input pipe 12; the first nitrogen conveying pipeline 10 is respectively connected with a low-pressure poly spinning user point 13 and a low-pressure PTA user point 14; the second nitrogen gas conveying pipeline 11 is connected to the nitrogen booster 5, the nitrogen booster 5 conveys the nitrogen gas after being boosted to the high-pressure nitrogen buffer tank 7, and the high-pressure nitrogen buffer tank 7 is connected with a high-pressure poly-spinning user point 15 and a high-pressure PTA user point 16.

Example 2:

a PTA poly-spinning integrated process tail gas utilization system comprises a PTA1 oxidation reactor 1, a PTA2 oxidation reactor 2, a common liquid nitrogen vaporizer 3, a common nitrogen buffer tank 4, a nitrogen booster 5, a low-pressure nitrogen buffer tank 6 and a high-pressure nitrogen buffer tank 7; the tops of the PTA1 oxidation reactor 1 and the PTA2 oxidation reactor 2 are both provided with tail gas output pipelines 8; the PTA1 oxidation reactor 1 and the PTA2 oxidation reactor 2 are connected to the low pressure nitrogen buffer tank 6 through the tail gas output pipeline 8; a nitrogen gas output pipe 9 is arranged at the top of the low-pressure nitrogen buffer tank 6, the nitrogen gas output pipe 9 is connected with a first nitrogen gas conveying pipeline 10 and a second nitrogen gas conveying pipeline 11, the nitrogen gas output pipe 9 is connected with a standby nitrogen gas input pipe 12, one end of the standby nitrogen gas input pipe 12 is connected with the public liquid nitrogen vaporizer 3, the public liquid nitrogen vaporizer 3 conveys vaporized nitrogen gas to the public nitrogen buffer tank 4, and the public nitrogen buffer tank 4 is connected to the nitrogen gas output pipe 9 through the standby nitrogen gas input pipe 12; the first nitrogen conveying pipeline 10 is respectively connected with a low-pressure poly spinning user point 13 and a low-pressure PTA user point 14; the second nitrogen gas conveying pipeline 11 is connected to the nitrogen booster 5, the nitrogen booster 5 conveys the nitrogen gas after being boosted to the high-pressure nitrogen buffer tank 7, and the high-pressure nitrogen buffer tank 7 is connected with a high-pressure poly-spinning user point 15 and a high-pressure PTA user point 16.

The invention changes the common liquid nitrogen vaporizer 3 from common use to standby use, reduces the purchase amount of liquid nitrogen, effectively solves the problem of overlarge consumption of fresh nitrogen in the PTA production process, reduces the production cost and greatly enhances the safe and stable operation of the PTA production device. And secondly, the service frequency of instruments related to the liquid nitrogen device is reduced, the service life of the instruments is prolonged, and the public consumption of water, electricity, gas and the like is reduced, so that the operation cost of the equipment is reduced.

Further, in another embodiment, the inside of the PTA1 oxidation reactor 1 and the PTA2 oxidation reactor 2 are provided with a stirrer 17, and the stirrer 17 is connected with a driving motor 18.

Further, in another embodiment, the pressure of the low-pressure nitrogen buffer tank 6 is in a range of 0.7-0.8 Mpa.

The pressure of the low-pressure nitrogen buffer tank 6 is controlled to be 0.7-0.8 Mpa, and the low-pressure nitrogen buffer tank can be used for PTA powder conveying, equipment purging, storage tank, pipeline sealing protection and bulk powder inflation protection.

Further, in another embodiment, the pressure of the high-pressure nitrogen buffer tank 7 ranges from 2.0 Mpa to 2.2 Mpa.

The nitrogen booster 5 controls the nitrogen pressure in the high-pressure nitrogen buffer tank 7 to be 2.0-2.2 Mpa, and can be used for emergency purging of a process air sprayer in an oxidation reactor, a CTA crystallizer and a rectifying tower.

Further, in another embodiment, the common liquid nitrogen vaporizer 3 is an air temperature vaporizer or a water bath vaporizer.

The air-temperature vaporizer is simple and convenient to install and convenient to maintain, the operation cost is low, and the vaporization fault rate is extremely low; the water bath type vaporizer has compact structure, small occupied area and low price.

The working principle of one embodiment of the invention is as follows:

when the PTA1 oxidation reactor 1 and the PTA2 oxidation reactor 2 are both in abnormal working conditions, a plant-area common liquid nitrogen vaporizer 3 vaporizes liquid nitrogen and stores the gasified liquid nitrogen in a common nitrogen buffer tank 4, and the gas nitrogen is used for supplying high-pressure and low-pressure nitrogen for all devices in a plant area during the isolation period of the PTA1 oxidation reactor 1 and the PTA2 oxidation reactor 2, so that the safety production is ensured.

When the PTA1 oxidation reactor 1 or the PTA2 oxidation reactor 2 single set of device is in abnormal working condition, high-pressure and low-pressure nitrogen of all devices in the plant area is provided by the tail gas of the PTA1 oxidation reactor 1 or the online oxidation reactor of the PTA2 oxidation reactor 2, and when the pressure of the high-pressure and low-pressure nitrogen buffer tanks is insufficient, the pressure is supplemented by the common nitrogen buffer tank 4, so that the supply of high-pressure and low-pressure nitrogen of all devices in the plant area is ensured, and the production fluctuation is reduced.

When the PTA1 oxidation reactor 1 and the PTA2 oxidation reactor 2 are both in normal working conditions, the PTA1 oxidation reactor 1 and the PTA2 oxidation reactor 2 are both on-line, and high-pressure and low-pressure nitrogen of all devices in a plant area is provided by tail gas of the PTA1 oxidation reactor 1 and the PTA2 oxidation reactor 2.

According to the description and the drawings, the PTA poly-spinning integrated process tail gas utilization system can be easily manufactured or used by the person skilled in the art, and can produce the positive effects recorded in the invention.

Unless otherwise specified, in the present invention, if there is an orientation or positional relationship indicated by terms of "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the terms describing orientation or positional relationship in the present invention are for illustrative purposes only, and should not be construed as limiting the present patent, specific meanings of the above terms can be understood by those of ordinary skill in the art in light of the specific circumstances in conjunction with the accompanying drawings.

Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass, for example, being fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.