Mixing conversion device and polyvinyl chloride production system

Abstract

The utility model provides a mixing conversion device and a polyvinyl chloride production system, and relates to the technical field of polyvinyl chloride production. The mixer is provided with a hydrogen chloride inlet, an acetylene inlet, an explosion-proof membrane rupture detection mechanism and a mixed converted gas outlet; the hydrogen chloride conveying pipe is used for connecting a hydrogen chloride synthesis section and a hydrogen chloride inlet; a hydrogen chloride stop valve is arranged on the hydrogen chloride conveying pipe; the acetylene conveying pipe is used for connecting an acetylene synthesis section and the acetylene inlet; an acetylene stop valve is arranged on the acetylene conveying pipe; the acetylene flame arrester is arranged on a path of the acetylene conveying pipe; the acetylene flame arrester is connected with a nitrogen conveying pipe, and a nitrogen stop valve is arranged on the nitrogen conveying pipe; and the acetylene cut-off valve, the hydrogen chloride cut-off valve and the nitrogen cut-off valve are all associated with the explosion-proof membrane rupture detection mechanism. The system comprises the device. According to the utility model, the treatment time for closing corresponding valves is shortened, the escape of hydrogen chloride gas and acetylene gas is avoided, the environmental pollution is reduced, and the safety risk is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of polyvinyl chloride production, in particular to a mixing conversion device and a polyvinyl chloride production system. Background Art

[0002] The current conversion process: the acetylene sent from the acetylene synthesis section and the hydrogen chloride gas sent from the hydrogen chloride synthesis section are converted into a mixer after adjusting the molar ratio. In the pipeline transportation process before acetylene and hydrogen chloride enter the mixer, a regulating valve and a shut-off valve are provided on the acetylene main pipe. The regulating valve is controlled by the SIS interlock and the DCS interlock to adjust the acetylene consumption of the polyvinyl chloride production system. The hydrogen chloride entering the mixer comes from the hydrogen chloride synthesis process. There is a delivery regulating valve on the transportation path, but the delivery regulating valve is still controlled by a manual valve. When the explosion-proof membrane of the mixer ruptures, the acetylene main pipe interlock triggers the shut-off valve to close, and the delivery regulating valve needs to be manually closed on site. The processing time of manually closing the delivery regulating valve is relatively long, and a large amount of hydrogen chloride gas escapes, making the operation more dangerous and causing environmental pollution, increasing the consequences of the accident and safety risks.

[0003] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or any form of implication that the information constitutes the prior art known to those skilled in the art. Utility Model Content

[0004] In view of the above situation, the utility model provides a mixed conversion device and a polyvinyl chloride production system, aiming to solve the technical problems that the current manual closing of the delivery regulating valve takes a long time, a large amount of hydrogen chloride gas escapes, making the operation more dangerous and causing environmental pollution, increasing the consequences of accidents and safety risks.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] In a first aspect, the utility model provides a hybrid conversion device, comprising:

[0007] The mixer has a hydrogen chloride inlet, an acetylene inlet, an explosion-proof membrane, an explosion-proof membrane rupture detection mechanism and a mixed conversion gas outlet; the explosion-proof membrane rupture detection mechanism is used to detect whether the explosion-proof membrane is ruptured;

[0008] A hydrogen chloride delivery pipe is used to connect the hydrogen chloride synthesis section and the hydrogen chloride inlet; a hydrogen chloride cut-off valve is provided on the hydrogen chloride delivery pipe;

[0009] An acetylene delivery pipe is used to connect the acetylene synthesis section and the acetylene inlet; an acetylene shut-off valve is provided on the acetylene delivery pipe;

[0010] An acetylene flame arrester is arranged on the path of the acetylene delivery pipe; the acetylene flame arrester is connected to a nitrogen delivery pipe, and a nitrogen shut-off valve is arranged on the nitrogen delivery pipe;

[0011] Among them, the acetylene shut-off valve, the hydrogen chloride shut-off valve and the nitrogen shut-off valve are all associated with the explosion-proof membrane rupture detection mechanism.

[0012] In some embodiments of the present invention, a water-gas separator is also included which is arranged on the path of the acetylene delivery pipe.

[0013] In some embodiments of the present invention, the gas phase outlet of the water-gas separator, the acetylene cut-off valve, the acetylene flame arrester and the acetylene inlet are connected in sequence.

[0014] In some embodiments of the present invention, the outlet of the mixed reformed gas is connected to a desulfurization device.

[0015] In some embodiments of the present invention, the desulfurization device includes an acid mist collector.

[0016] In some embodiments of the present invention, a cooling device is connected between the mixed reformed gas outlet and the desulfurization device.

[0017] In some embodiments of the present invention, the cooling device includes a graphite cooler.

[0018] In some embodiments of the present invention, there are multiple cooling devices.

[0019] In some embodiments of the present invention, a preheater is also included, and the desulfurization device and the preheater are connected in sequence.

[0020] In a second aspect, the utility model provides a polyvinyl chloride production system, comprising the above-mentioned mixing conversion device.

[0021] The embodiments of the present invention have at least the following advantages or beneficial effects:

[0022] The processing time for closing the corresponding valves (especially the hydrogen chloride shut-off valve) is shortened, the escape of hydrogen chloride gas and acetylene gas is avoided, environmental pollution is reduced, and safety risks are reduced.

[0023] Other features and advantages of the present invention will be set forth in the following description, and in part will become apparent from the description, or may be understood by practicing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 It is a schematic diagram of the structure of the mixed conversion device.

[0026] icon:

[0027] 1-Mixer, 11-Explosion-proof membrane, 12-Mixed conversion gas outlet,

[0028] 2-hydrogen chloride delivery pipe, 21-hydrogen chloride cut-off valve,

[0029] 3-Acetylene delivery pipe, 31-Acetylene cut-off valve,

[0030] 4- Water-gas separator,

[0031] 5-acetylene flame arrester, 51-nitrogen delivery pipe, 52-nitrogen shut-off valve. DETAILED DESCRIPTION

[0032] In the following, only some exemplary embodiments are briefly described. As those skilled in the art can appreciate, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present invention.

[0033] In the description of the embodiments of the present invention, it should be understood that the term "plurality" means two or more than two, unless otherwise clearly and specifically defined.

[0034] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0035] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0036] See also Figure 1 This embodiment provides a polyvinyl chloride production system, including a mixing conversion device for producing vinyl chloride; the mixing conversion device is a part of the polyvinyl chloride production system, and this application mainly makes improvements to the mixing conversion device.

[0037] The mixed conversion device comprises a mixer 1, a hydrogen chloride delivery pipe 2, an acetylene delivery pipe 3, a water-gas separator 4 and an acetylene flame arrester 5.

[0038] The mixer 1 has a hydrogen chloride inlet, an acetylene inlet, an explosion-proof membrane 11, an explosion-proof membrane rupture detection mechanism and a mixed conversion gas outlet 12; hydrogen chloride and acetylene enter the mixer 1 for mixed reaction; the explosion-proof membrane rupture detection mechanism is used to detect whether the explosion-proof membrane 11 of the mixer 1 is ruptured.

[0039] The mixed reformed gas outlet 12 is connected in sequence to a cooling device (not shown in the figure), a desulfurization device (not shown in the figure) and a preheater (not shown in the figure), wherein the cooling device is, for example, a graphite cooler; the desulfurization device is, for example, an acid mist collector, and the number of cooling devices and desulfurization devices is not limited, and both can be multiple.

[0040] The hydrogen chloride delivery pipe 2 is used to connect the hydrogen chloride synthesis section and the hydrogen chloride inlet; the hydrogen chloride delivery pipe 2 is provided with a hydrogen chloride cut-off valve 21 .

[0041] The acetylene delivery pipe 3 is used to connect the acetylene synthesis section and the acetylene inlet; the acetylene delivery pipe 3 is provided with a flow regulating valve and an acetylene shut-off valve 31 .

[0042] The water-gas separator 4 is arranged on the path of the acetylene delivery pipe 3. The water-gas separator 4 is used to remove moisture from the acetylene gas.

[0043] The acetylene flame arrester 5 is arranged on the path of the acetylene delivery pipe 3; the acetylene flame arrester 5 is connected to the nitrogen delivery pipe 51, and the nitrogen delivery pipe 51 is provided with a nitrogen shut-off valve 52; the gas phase outlet of the water-gas separator 4, the acetylene shut-off valve 31, the acetylene flame arrester 5 and the acetylene inlet are connected in sequence.

[0044] The acetylene shut-off valve 31, the hydrogen chloride shut-off valve 21 and the nitrogen shut-off valve 52 are all associated with the explosion-proof membrane rupture detection mechanism. When the explosion-proof membrane rupture detection mechanism detects that the explosion-proof membrane 11 of the mixer 1 is ruptured, the acetylene shut-off valve 31 and the hydrogen chloride shut-off valve 21 are automatically and quickly closed through the supporting control system (such as the DCS system) to block the delivery of acetylene and hydrogen chloride, and the nitrogen shut-off valve 52 is opened to pass nitrogen as protection.

[0045] In combination with the above content, this embodiment has at least the following beneficial effects:

[0046] 1. The processing time for closing the corresponding valves (especially the hydrogen chloride shut-off valve 21) is shortened, the escape of hydrogen chloride gas and acetylene gas is avoided, the environmental pollution is reduced, and the safety risk is reduced.

[0047] 2. Through the setting of graphite cooler, acid mist collector and preheater, the gas (vinyl chloride) obtained after the mixed conversion of hydrogen chloride and acetylene is treated to prepare for the subsequent production of polyvinyl chloride.

[0048] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. In the absence of conflicts, the embodiments of the present application and the features in the embodiments may be combined with each other at will. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A mixed conversion device, characterized in that: include: A mixer having a hydrogen chloride inlet, an acetylene inlet, an explosion-proof membrane, an explosion-proof membrane rupture detection mechanism and a mixed conversion gas outlet; The explosion-proof membrane rupture detection mechanism is used to detect whether the explosion-proof membrane is ruptured; A hydrogen chloride delivery pipe, used to connect the hydrogen chloride synthesis section and the hydrogen chloride inlet; the hydrogen chloride delivery pipe is provided with a hydrogen chloride cut-off valve; An acetylene delivery pipe is used to connect the acetylene synthesis section and the acetylene inlet; an acetylene shut-off valve is provided on the acetylene delivery pipe; An acetylene flame arrester is arranged on the path of the acetylene delivery pipe; the acetylene flame arrester is connected to a nitrogen delivery pipe, and a nitrogen shut-off valve is arranged on the nitrogen delivery pipe; Wherein, the acetylene cut-off valve, the hydrogen chloride cut-off valve and the nitrogen cut-off valve are all associated with the explosion-proof membrane rupture detection mechanism.

2. The hybrid conversion device according to claim 1, characterized in that: It also includes a water-gas separator arranged on the path of the acetylene delivery pipe.

3. The hybrid conversion device according to claim 2, characterized in that: The gas phase outlet of the water-gas separator, the acetylene cut-off valve, the acetylene flame arrester and the acetylene inlet are connected in sequence.

4. The hybrid conversion device according to claim 1, characterized in that: The mixed reformed gas outlet is connected with a desulfurization device.

5. The hybrid conversion device according to claim 4, characterized in that: The desulfurization device comprises an acid mist collector.

6. The hybrid conversion device according to claim 4, characterized in that: A cooling device is connected between the mixed reformed gas outlet and the desulfurization device.

7. The hybrid conversion device according to claim 6, characterized in that: The cooling device comprises a graphite cooler.

8. The hybrid conversion device according to claim 6, characterized in that: There are multiple cooling devices.

9. The hybrid conversion device according to any one of claims 4 to 8, characterized in that: It also includes a preheater, and the desulfurization device and the preheater are connected in sequence.

10. A polyvinyl chloride production system, characterized in that: It comprises a mixed conversion device as described in any one of claims 1 to 9.

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