VCM reactor on-line switching system

Abstract

The utility model discloses an online switching system for VCM (vinyl chloride monomer) reactors, which relates to the technical field of chemical engineering and comprises a plurality of vinyl chloride reactors, a feed gas inlet header pipe, a reaction gas outlet header pipe and a reactor switching header pipe. A gas inlet of each vinyl chloride reactor is communicated with a feed gas inlet header pipe through a gas inlet branch pipeline with a control valve, and a gas outlet of each vinyl chloride reactor is communicated with a reaction gas outlet header pipe through a gas outlet branch pipeline with a control valve; the reactor switching header pipe is respectively communicated with the two air inlet branch pipelines through an air inlet switching pipeline with a control valve, and is respectively communicated with the two air outlet branch pipelines through an air outlet switching pipeline with a switching valve. The device is reasonable in design, and in the technological process, each reactor is connected with the feed gas inlet header pipe, the reaction gas outlet header pipe and the reactor switching header pipe. By adopting the gas inlet and outlet header pipe, the reactor switching header pipe and the switching valve, online switching of the reactors is realized, and front and back reactors can be freely combined.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical engineering, and more specifically to the technical field of an on-line switching system for a VCM reactor. Background Technique

[0002] In an acetylene method vinyl chloride device, a mixed gas of acetylene and hydrogen chloride undergoes a gas-solid reaction in a reactor under the action of a catalyst (with activated carbon as the carrier) to produce vinyl chloride gas. Since the number of reactors is relatively large (taking 200,000 tons as an example, there are generally about 50 reactors), in the existing design, the reactors are divided into two groups, front and back. 25 reactors are connected in parallel as the first group, and the other 25 reactors are connected in parallel as the second group for the reaction. After the raw material gas mixture passes through the first group of reactors, the acetylene conversion rate is greater than 70%. After passing through the second group of reactors, the total acetylene conversion rate is 98%.

[0003] When the conversion rate of the reaction process decreases and cannot meet the production requirements, the catalyst needs to be replaced. In order to make full use of the catalyst, the front group of reactors is filled with a catalyst with lower activity (i.e., the catalyst removed from the latter group of reactors). The latter group is filled with a catalyst with higher activity (new catalyst). In this way, every time the activity of the latter group of reactors decreases, the catalyst in the reactors needs to be unloaded first and then loaded into the front group of reactors. The loading and unloading of the catalyst will cause loss of the catalyst. When loading and unloading the catalyst, the reactor needs to be replaced to discharge the materials in the reactor, resulting in environmental pollution and material loss, increasing the operating cost. At the same time, loading and unloading the catalyst will also greatly increase the labor intensity of workers. Moreover, the number of reactors in the same group is too large, and the resistance drop is different due to different packing tightness of each catalyst, so the raw material gas cannot be evenly distributed in each reactor. Content of the Utility Model

[0004] The purpose of the utility model is to provide an on-line switching system for a VCM reactor in order to solve the above technical problems.

[0005] The utility model specifically adopts the following technical solutions to achieve the above purpose:

[0006] The utility model provides an on-line switching system for a VCM reactor, which includes multiple vinyl chloride reactors, a raw material gas inlet main pipe, a reaction gas outlet main pipe, and a reactor switching main pipe;

[0007] The inlet of each vinyl chloride reactor is communicated with the raw material gas inlet main pipe through an inlet branch pipe with a control valve, and the outlet of each vinyl chloride reactor is communicated with the reaction gas outlet main pipe through an outlet branch pipe with a control valve;

[0008] The reactor switching main pipe is respectively communicated with the two inlet branch pipes through an inlet switching pipe with a control valve, and the reactor switching main pipe is respectively communicated with the two outlet branch pipes through an outlet switching pipe with a switching valve.

[0009] Specifically, in the process flow, each reactor is connected to the raw material gas inlet main pipe, the reaction gas outlet main pipe, and the reactor switching main pipe. Through the switching valves, each reactor can act as either the front-stage or the back-stage (the online switching of the reactors is achieved by using the inlet and outlet main pipes, the reactor switching main pipe, and the switching valves, and the front-stage and back-stage reactors can be freely combined).

[0010] In one embodiment, the number of vinyl chloride reactors is two, namely the first vinyl chloride reactor and the second vinyl chloride reactor.

[0011] In one embodiment, the raw material gas inlet main pipe is connected to the inlet of the first vinyl chloride reactor through the first pipeline, and a first control valve is provided on the first pipeline;

[0012] The raw material gas inlet main pipe is connected to the inlet of the second vinyl chloride reactor through the fifth pipeline, and a fifth control valve is provided on the fifth pipeline.

[0013] In one embodiment, the reaction gas outlet main pipe is connected to the outlet of the first vinyl chloride reactor through the third pipeline, and a third control valve is provided on the third pipeline;

[0014] The reaction gas outlet main pipe is connected to the outlet of the second vinyl chloride reactor through the seventh pipeline, and a seventh control valve is provided on the seventh pipeline.

[0015] In one embodiment, the reactor switching main pipe is connected to the first pipeline located below the first control valve through the second pipeline, and a second control valve is provided on the second pipeline;

[0016] The reactor switching main pipe is connected to the third pipeline located below the third control valve through the fourth pipeline, and a fourth control valve is provided on the fourth pipeline;

[0017] The reactor switching main pipe is connected to the fifth pipeline located below the fifth control valve through the sixth pipeline, and a sixth control valve is provided on the sixth pipeline;

[0018] The reactor switching main pipe is connected to the eighth pipeline located below the seventh control valve through the eighth pipeline, and an eighth control valve is provided on the eighth pipeline.

[0019] In one embodiment, a first flowmeter is provided near the inlet on the first pipeline, and a second flowmeter is provided near the inlet on the seventh pipeline.

[0020] Specifically, flow control is set for the reactor to ensure uniform flow into the reactor. Multi-channel on-line analysis is set at the reactor outlet to analyze the composition of the outlet gas and switch the reactor according to the results.

[0021] In one embodiment, a ninth control valve is provided near the air inlet on the first pipeline, and a tenth control valve is provided near the air inlet on the seventh pipeline.

[0022] In one embodiment, an eleventh control valve is provided near the air outlet on the third pipeline, and a twelfth control valve is provided near the air outlet on the seventh pipeline.

[0023] In one embodiment, pressure sensors are provided on both the first vinyl chloride reactor and the second vinyl chloride reactor.

[0024] In one embodiment, the first vinyl chloride reactor and the second vinyl chloride reactor are arranged in parallel.

[0025] The online switching process is as follows:

[0026] Figure 1 As shown, when the first vinyl chloride reactor is the foreground reactor and the second vinyl chloride reactor is the background reactor, open the first control valve, the fourth control valve, the sixth control valve, and the seventh control valve, and close the second control valve, the third control valve, the fifth control valve, and the eighth control valve. The raw material gas enters the reactor from the top of the first vinyl chloride reactor through the first control valve, the first flowmeter, and the ninth control valve from the raw material gas inlet main pipe. The reacted gas exits the reactor from the bottom of the first vinyl chloride reactor, then passes through the fourth control valve, the reactor switching main pipe, the sixth control valve, the second flowmeter, and the tenth control valve, enters the reactor from the top of the second vinyl chloride reactor, the reacted gas exits the reactor from the bottom of the second vinyl chloride reactor, and then enters the reaction gas main pipe through valve 7 and is sent to the subsequent process.

[0027] When the second vinyl chloride reactor is the foreground reactor and the first vinyl chloride reactor is the background reactor, open the second control valve, the third control valve, the fifth control valve, and the eighth control valve, and close the first control valve, the fourth control valve, the sixth control valve, and the seventh control valve. The raw material gas enters the reactor from the top of the second vinyl chloride reactor through the fifth control valve, the second flowmeter, and the tenth control valve from the raw material gas inlet main pipe. The reacted gas exits the reactor from the bottom of the second vinyl chloride reactor, then passes through the eighth control valve, the reactor switching main pipe, the second control valve, the first flowmeter, and the seventh control valve, enters the reactor from the top of the first vinyl chloride reactor, the reacted gas exits the reactor from the bottom of the first vinyl chloride reactor, and then enters the reaction gas main pipe through the third control valve and is sent to the subsequent process.

[0028] Only two reactors are listed above. Any number of reactors can be arbitrarily switched between the foreground and the background through the inlet / outlet and switching main pipes, switching valves, etc. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

[0029] The beneficial effects of the present utility model are as follows:

[0030] In the present utility model, any one of the reactors can be used as the front-stage reactor and can also be used as the subsequent reactor. During production, the reactor can be switched between the front stage and the back stage according to the service life of the catalyst, without the need to replace the catalyst, reducing material loss and environmental pollution and lowering the labor intensity; at the same time, the number of front-stage and back-stage reactors can be adjusted arbitrarily, increasing the production flexibility. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0032] Figure 1 is a schematic structural diagram of the present utility model;

[0033] Reference numerals: 1 - First vinyl chloride reactor, 2 - Second vinyl chloride reactor, 3 - Total reaction gas outlet pipe, 4 - Total reactor switching pipe, 5 - Total raw material gas inlet pipe, 6 - First control valve, 7 - Second control valve, 8 - Third control valve, 9 - Fourth control valve, 10 - Fifth control valve, 11 - Sixth control valve, 12 - Seventh control valve, 13 - Eighth control valve, 14 - Ninth control valve, 15 - Tenth control valve, 16 - Eleventh control valve, 17 - Twelfth control valve. Detailed Embodiments

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0037] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "inner", "outer", "upper", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0038] Embodiment 1

[0039] As Figure 1 shown, this embodiment provides an online switching system for a VCM reactor of the present utility model, which includes multiple vinyl chloride reactors, a raw material gas inlet main pipe 5, a reaction gas outlet main pipe, and a reactor switching main pipe;

[0040] The inlet of each vinyl chloride reactor is connected to the raw material gas inlet main pipe 5 through an inlet branch pipe with a control valve, and the outlet of each vinyl chloride reactor is connected to the reaction gas outlet main pipe through an outlet branch pipe with a control valve;

[0041] The reactor switching main pipe is respectively connected to the two inlet branch pipes through an inlet switching pipe with a control valve, and the reactor switching main pipe is respectively connected to the two outlet branch pipes through an outlet switching pipe with a switching valve.

[0042] Specifically, in the process flow, each reactor (the first vinyl chloride reactor 1 or the second vinyl chloride reactor 2) is connected to the raw material gas inlet main pipe 5, the reaction gas outlet main pipe, and the reactor switching main pipe. Through the switching valve, each reactor can be either the front-stage or the back-stage (the online switching of the reactor is realized by using the inlet and outlet main pipes, the reactor switching main pipe, and the switching valve, and the front-stage and back-stage reactors can be freely combined).

[0043] Embodiment 2

[0044] This embodiment further optimizes on the basis of Embodiment 1, specifically:

[0045] The number of vinyl chloride reactors is two, namely the first vinyl chloride reactor 1 and the second vinyl chloride reactor 2.

[0046] The main inlet pipe 5 of the feed gas is connected to the inlet of the first vinyl chloride reactor 1 through the first pipeline, and a first control valve 6 is provided on the first pipeline;

[0047] The main inlet pipe 5 of the feed gas is connected to the inlet of the second vinyl chloride reactor 2 through the fifth pipeline, and a fifth control valve 10 is provided on the fifth pipeline.

[0048] The main outlet pipe of the reaction gas is connected to the outlet of the first vinyl chloride reactor 1 through the third pipeline, and a third control valve 8 is provided on the third pipeline;

[0049] The main outlet pipe of the reaction gas is connected to the outlet of the second vinyl chloride reactor 2 through the seventh pipeline, and a seventh control valve 12 is provided on the seventh pipeline.

[0050] The reactor switching main pipe is connected to the first pipeline below the first control valve 6 through the second pipeline, and a second control valve 7 is provided on the second pipeline;

[0051] The reactor switching main pipe is connected to the third pipeline below the third control valve 8 through the fourth pipeline, and a fourth control valve 9 is provided on the fourth pipeline;

[0052] The reactor switching main pipe is connected to the fifth pipeline below the fifth control valve 10 through the sixth pipeline, and a sixth control valve 11 is provided on the sixth pipeline;

[0053] The reactor switching main pipe is connected to the eighth pipeline below the seventh control valve 12 through the eighth pipeline, and an eighth control valve 13 is provided on the eighth pipeline.

[0054] A first flowmeter is provided near the inlet on the first pipeline, and a second flowmeter is provided near the inlet on the seventh pipeline.

[0055] Specifically, flow control is set for the reactor to ensure uniform flow into the reactor. Multi-channel on-line analysis is set at the reactor outlet to analyze the composition of the outlet gas and switch the reactor according to the results.

[0056] Example 3

[0057] This example is further optimized on the basis of Example 1. Specifically:

[0058] A ninth control valve 14 is provided near the inlet on the first pipeline, and a tenth control valve 15 is provided near the inlet on the seventh pipeline.

[0059] An eleventh control valve 16 is provided near the outlet on the third pipeline, and a twelfth control valve 17 is provided near the outlet on the seventh pipeline.

[0060] Pressure sensors are provided on both the first vinyl chloride reactor 1 and the second vinyl chloride reactor 2.

[0061] The first vinyl chloride reactor 1 and the second vinyl chloride reactor 2 are arranged side by side.

[0062] The online switching process is as follows:

[0063] Figure 1 As shown, when the first vinyl chloride reactor 1 is the foreground reactor and the second vinyl chloride reactor 2 is the background reactor, open the first control valve 6, the fourth control valve 9, the sixth control valve 11, and the seventh control valve 12, and close the second control valve 7, the third control valve 8, the fifth control valve 10, and the eighth control valve 13. The raw material gas enters the reactor from the top of the first vinyl chloride reactor 1 through the first control valve 6, the first flowmeter, and the ninth control valve 14 after passing through the raw material gas inlet main pipe 5. The reacted gas exits the reactor from the bottom of the first vinyl chloride reactor 1, and then passes through the fourth control valve 9, the reactor switching main pipe, the sixth control valve 11, the second flowmeter, and the tenth control valve 15, and enters the reactor from the top of the second vinyl chloride reactor 2. The reacted gas exits the reactor from the bottom of the second vinyl chloride reactor 2, and then enters the reaction gas main pipe through the valve 7 and is sent to the subsequent process.

[0064] When the second vinyl chloride reactor 2 is the foreground reactor and the first vinyl chloride reactor 1 is the background reactor, open the second control valve 7, the third control valve 8, the fifth control valve 10, and the eighth control valve 13, and close the first control valve 6, the fourth control valve 9, the sixth control valve 11, and the seventh control valve 12. The raw material gas enters the reactor from the top of the second vinyl chloride reactor 2 through the fifth control valve 10, the second flowmeter, and the tenth control valve 15 after passing through the raw material gas inlet main pipe 5. The reacted gas exits the reactor from the bottom of the second vinyl chloride reactor 2, and then passes through the eighth control valve 13, the reactor switching main pipe, the second control valve 7, the first flowmeter, and the seventh control valve 12, and enters the reactor from the top of the first vinyl chloride reactor 1. The reacted gas exits the reactor from the bottom of the first vinyl chloride reactor 1, and then enters the reaction gas main pipe through the third control valve 8 and is sent to the subsequent process.

[0065] Only two reactors are listed above. Any number of reactors can be arbitrarily switched between the foreground and the background through the inlet / outlet and switching main pipes, switching valves, etc. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An on-line switching system for a VCM reactor, characterized in that, It includes multiple vinyl chloride reactors, a raw material gas inlet main pipe (5), a reaction gas outlet main pipe, and a reactor switching main pipe; The inlet of each of the vinyl chloride reactors is communicated with the raw material gas inlet main pipe (5) through an inlet branch pipe with a control valve, and the outlet of each of the vinyl chloride reactors is communicated with the reaction gas outlet main pipe through an outlet branch pipe with a control valve; The reactor switching main pipe is respectively communicated with the two inlet branch pipes through an inlet switching pipe with a control valve, and the reactor switching main pipe is respectively communicated with the two outlet branch pipes through an outlet switching pipe with a switching valve.

2. The online switching system of a VCM reactor according to claim 1, wherein, The number of the vinyl chloride reactors is two, namely a first vinyl chloride reactor (1) and a second vinyl chloride reactor (2).

3. The on-line switching system of a VCM reactor according to claim 2, characterized in that The raw material gas inlet main pipe (5) is communicated with the inlet of the first vinyl chloride reactor (1) through a first pipe, and a first control valve (6) is arranged on the first pipe; The raw material gas inlet main pipe (5) is communicated with the inlet of the second vinyl chloride reactor (2) through a fifth pipe, and a fifth control valve (10) is arranged on the fifth pipe.

4. An on-line switching system for a VCM reactor according to claim 3, characterized in that, The reaction gas outlet main pipe is communicated with the outlet of the first vinyl chloride reactor (1) through a third pipe, and a third control valve (8) is arranged on the third pipe; The reaction gas outlet main pipe is communicated with the outlet of the second vinyl chloride reactor (2) through a seventh pipe, and a seventh control valve (12) is arranged on the seventh pipe.

5. An on-line switching system for a VCM reactor according to claim 4, characterized in that, The reactor switching main pipe is communicated with the first pipe below the first control valve (6) through a second pipe, and a second control valve (7) is arranged on the second pipe; The reactor switching main pipe is communicated with the third pipe below the third control valve (8) through a fourth pipe, and a fourth control valve (9) is arranged on the fourth pipe; The reactor switching main pipe is communicated with the fifth pipe below the fifth control valve (10) through a sixth pipe, and a sixth control valve (11) is arranged on the sixth pipe; The reactor switching main pipe is communicated with the eighth pipe below the seventh control valve (12) through an eighth pipe, and an eighth control valve (13) is arranged on the eighth pipe.

6. The on-line switching system of a VCM reactor according to claim 5, wherein, A first flowmeter is arranged on the first pipe near the inlet, and a second flowmeter is arranged on the seventh pipe near the inlet.

7. An on-line switching system for a VCM reactor according to claim 6, characterized in that, A ninth control valve (14) is arranged on the first pipe near the inlet, and a tenth control valve (15) is arranged on the seventh pipe near the inlet.

8. An on-line switching system for a VCM reactor according to claim 7, characterized in that, An eleventh control valve (16) is arranged on the third pipe near the outlet, and a twelfth control valve (17) is arranged on the seventh pipe near the outlet.

9. The on-line switching system of a VCM reactor according to claim 2, wherein, Pressure sensors are arranged on both the first vinyl chloride reactor (1) and the second vinyl chloride reactor (2).

10. An on-line switching system for a VCM reactor according to claim 6, characterized in that, The first vinyl chloride reactor (1) and the second vinyl chloride reactor (2) are arranged side by side.

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