Vinyl chloride polymerization inhibitor adding device

Abstract

The utility model discloses a vinyl chloride polymerization inhibitor adding device, which belongs to the technical field of chemical additive adding equipment and comprises a polymerization inhibitor storage tank and a material mixing pipe, the material mixing pipe is used for mixing vinyl chloride and a polymerization inhibitor, a first valve and a flow meter are arranged between the polymerization inhibitor storage tank and the material mixing pipe, and the material mixing pipe is further communicated with a nitrogen storage tank. A second valve is arranged between the nitrogen storage tank and the mixing pipe, a barometer is arranged in the mixing pipe, and a third valve is arranged at the inlet end of the mixing pipe; the first valve, the flow meter, the second valve, the barometer and the third valve are in interlocking control through the automatic control unit, the polymerization inhibitor is automatically added through the automatic control unit, and the efficiency is improved; the stable mixing of the polymerization inhibitor and the vinyl chloride monomer is ensured by adjusting the opening amplitude of the first valve; and the residual vinyl chloride monomer and the polymerization inhibitor are extruded from the mixing pipe by utilizing high-pressure nitrogen, so that the residue is reduced, the waste is prevented, and the subsequent product quality is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to chemical additive adding equipment technical field, concretely relates to a vinyl chloride polymerization inhibitor adding device. BACKGROUND

[0002] Polyvinyl chloride (PVC) is that vinyl chloride monomer (VCM) is polymerized under the action of peroxide, azo compound or under the action of light and heat according to the mechanism of free radical polymerization, vinyl chloride homopolymer and vinyl chloride copolymer are collectively referred to as vinyl chloride resin (SPVC).

[0003] Due to the existence of water and trace oxygen, under certain temperature and pressure, vinyl chloride and oxygen react to generate vinyl chloride peroxide, and free radicals are generated after the chain scission of peroxide, thereby forming low molecular weight vinyl chloride self-polymer, causing equipment blockage. At the same time, vinyl chloride peroxide can hydrolyze to produce hydrogen chloride, formic acid and other acidic substances, thereby corroding the equipment.

[0004] Polymerization inhibitor is an industrial additive, which is usually used to prevent the progress of polymerization, and the polymerization inhibitor molecules react with chain free radicals to form non-free radical substances or low-activity free radicals that cannot initiate, thereby terminating the polymerization.

[0005] During the shipping process of vinyl chloride product, the vinyl chloride monomer needs to be pumped into the transport container through the loading pump, and the polymerization inhibitor needs to be added before the vinyl chloride monomer is transported to the inlet of the loading pump to prevent the problem of vinyl chloride self-polymer blockage and equipment corrosion, but in the existing vinyl chloride product loading process, manual control of the polymerization inhibitor is often used, which is low in efficiency, time-consuming and laborious, the mixing ratio of the polymerization inhibitor and the vinyl chloride monomer cannot be stably maintained at a stable value, and the polymerization effect is reduced; at the same time, after the shipping and transportation of the vinyl chloride resin product are completed, part of the polymerization inhibitor and the vinyl chloride resin product will still be left in the pipeline, causing waste, and if not cleaned in time, it will affect the polymerization effect in the subsequent vinyl chloride resin product transportation process. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a vinyl chloride polymerization inhibitor adding device, which can realize quantitative feeding of the polymerization inhibitor, ensure the polymerization effect, and press out the residual polymerization inhibitor and vinyl chloride resin product through high-pressure nitrogen gas, reduce the residue, and prevent waste.

[0007] In order to achieve the above object, the utility model provides a vinyl chloride polymerization inhibitor adding device, including polymerization inhibitor storage tank, polymerization inhibitor storage tank is connected with mixing pipe, mixing pipe is used for mixing vinyl chloride and polymerization inhibitor, it is provided with first valve and flow meter between polymerization inhibitor storage tank and mixing pipe, mixing pipe still is connected with nitrogen storage tank, it is provided with second valve between nitrogen storage tank and mixing pipe, mixing pipe tail is connected with pump, it is provided with barometer in mixing pipe, and the inlet end of mixing pipe is provided with third valve, wherein, first valve, flow meter, second valve, barometer and third valve are electrically connected with automatic control unit, and are controlled through automatic control unit interlock.

[0008] Preferably, the first valve and the flow meter are provided with a polymerization inhibitor feed port, and a cover plate is installed on the polymerization inhibitor feed port. The polymerization inhibitor flows to the mixing pipe through the polymerization inhibitor feed port, and the cover plate can prevent the polymerization inhibitor from overflowing.

[0009] Preferably, the mixing pipe includes a vinyl chloride feed pipe provided at the inlet end thereof and connected with the third valve, a feed connection pipe connected at the tail end of the vinyl chloride feed pipe, a mixing pipe body connected at the tail end of the feed connection pipe, a barometer provided inside the mixing pipe body, a discharge connection pipe connected at the tail end of the mixing pipe body, a vinyl chloride discharge pipe connected at the tail end of the discharge connection pipe, and the vinyl chloride discharge pipe is connected with the pump.

[0010] Preferably, the flow meter and the second valve are both connected with the feed connection pipe.

[0011] Preferably, the top of the polymerization inhibitor storage tank is provided with an observation port and a polymerization inhibitor adding port, and a liquid level gauge is provided inside the polymerization inhibitor storage tank, which facilitates observation of the liquid level change of the polymerization inhibitor in the polymerization inhibitor storage tank 1 and addition of the polymerization inhibitor.

[0012] Preferably, the polymerization inhibitor adding port is provided with a stainless steel filter screen, and the pore size of the filter screen is 0.5-3 mm. The stainless steel filter screen is used to filter impurities in the polymerization inhibitor to prevent product contamination.

[0013] Preferably, a check valve is connected at the tail end of the pump, and the pipe diameter of the check valve ranges from DN15 to DN40.

[0014] Preferably, the first valve, the second valve and the third valve are all ball valves.

[0015] The design temperature of the first valve and the second valve is 50-150 DEG C, and the pipe diameter ranges from DN15 to DN25;

[0016] The design temperature of the third valve is 50-250 DEG C, the pipe diameter ranges from DN25 to DN80, and the third valve has a fireproof and anti-static structure.

[0017] Preferably, an angle steel is welded on the outer side of the side wall of the mixing pipe body, which is used to stably install the mixing pipe body on the existing loading and transportation production line.

[0018] Preferably, the inner wall surface of the mixing pipe is coated with a first anticorrosive coating, a second anticorrosive coating and a third anticorrosive coating in sequence, wherein the first anticorrosive coating is zinc-rich epoxy paint, the second anticorrosive coating is epoxy cloud iron paint, and the third anticorrosive coating is acrylic polyurethane paint, so as to prevent the inner wall of the mixing pipe body from being corroded and causing damage to the equipment.

[0019] The vinyl chloride polymerization inhibitor adding device has the advantages that the device has simple structure and reasonable design, the automatic control unit is used to realize automatic addition of the polymerization inhibitor and improve efficiency, the flowmeter is used to monitor the flow value of the polymerization inhibitor, and the automatic control unit adjusts the opening range of the first valve according to the flow value, so that the mixing ratio of the polymerization inhibitor and the vinyl chloride monomer is kept at a stable value, the polymerization effect is ensured, the automatic control unit is used to control the high-pressure nitrogen gas into the mixing pipe body, the pressure difference between the inside and outside of the mixing pipe body is utilized, the residual vinyl chloride monomer and polymerization inhibitor in the mixing pipe body are squeezed out from the mixing pipe under the pressure of the high-pressure nitrogen gas, the residual amount is reduced, waste is prevented, and the quality of subsequent products is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic view of the vinyl chloride polymerization inhibitor adding device.

[0021] In the drawing: 1, polymerization inhibitor storage tank, 11, observation port, 12, polymerization inhibitor adding port, 13, liquid level meter, 2, first valve, 3, polymerization inhibitor feeding port, 31, cover plate, 4, flowmeter, 5, nitrogen storage tank, 6, second valve, 7, third valve, 8, mixing pipe, 81, vinyl chloride feeding pipe, 82, feeding connecting pipe, 83, pressure gauge, 84, mixing pipe body, 841, angle steel, 85, discharging connecting pipe, 86, vinyl chloride discharging pipe, 9, pump, 10, check valve. DETAILED DESCRIPTION

[0022] The utility model discloses a kind of vinyl chloride polymerization inhibitor adding devices, for in vinyl chloride resin product shipment transportation process, realize quantitative feeding polymerization inhibitor, residual polymerization inhibitor and vinyl chloride resin product are pressed out simultaneously by high-pressure nitrogen gas, reduce residual.

[0023] The specific implementation of the utility model is described in further detail below in combination with drawings and examples. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

[0024] As Figure 1The utility model discloses a vinyl chloride polymerization inhibitor adding device, including polymerization inhibitor storage jar 1, and polymerization inhibitor storage jar 1 is connected with the mixing pipe 8 of communication, and the mixing pipe 8 is used for mixing vinyl chloride and polymerization inhibitor, and the first valve 2 and flowmeter 4 are arranged between polymerization inhibitor storage jar 1 and mixing pipe 8, and the mixing pipe 8 still is connected with nitrogen storage jar 5, and the second valve 6 is arranged between nitrogen storage jar 5 and mixing pipe 8, and the pump 9 is connected with the tail of mixing pipe 8, and the barometer 83 is arranged in the mixing pipe 8, and the third valve 7 is arranged at the inlet end of mixing pipe 8,

[0025] opening the first valve 2, the polymerization inhibitor of polymerization inhibitor storage jar 1 can enter the mixing pipe 8, and the flowmeter 4 monitors the flow of polymerization inhibitor, and opening the third valve 7, vinyl chloride monomer product can enter the mixing pipe 8, and opening the first valve 2 and the third valve 7 simultaneously, the polymerization inhibitor and vinyl chloride monomer product are mixed in the mixing pipe 8, and the vinyl chloride monomer product mixed with the polymerization inhibitor flows to the carrying container through the pump 9.

[0026] opening the second valve 6, the nitrogen in nitrogen storage jar 5 can enter the mixing pipe 8, and the barometer 83 monitors the gas pressure in the mixing pipe 8 simultaneously.

[0027] In the embodiment disclosed by the utility model, the first valve 2 and the flowmeter 4 are provided with the polymerization inhibitor feed inlet 3, the polymerization inhibitor feed inlet 3 is installed with the cover plate 31, and the polymerization inhibitor flows to the mixing pipe 8 through the polymerization inhibitor feed inlet 3, and the cover plate 31 can prevent the polymerization inhibitor from overflowing.

[0028] In the embodiment disclosed by the utility model, the mixing pipe 8 includes the vinyl chloride feed pipe 81 that is arranged at the inlet end and is communicated with the third valve 7, the tail of the vinyl chloride feed pipe 81 is communicated with the feed connecting pipe 82, the tail of the feed connecting pipe 82 is communicated with the mixing pipe main body 84, and the barometer 83 is arranged in the mixing pipe main body 84, and the barometer 83 is used for monitoring the gas pressure in the mixing pipe main body 84.

[0029] The tail of the mixing pipe main body 84 is communicated with the discharge connecting pipe 85, the tail of the discharge connecting pipe 85 is communicated with the vinyl chloride discharge pipe 86, and the vinyl chloride discharge pipe 86 is communicated with the pump 9. Among them, the pump 9 can be vertical diaphragm metering pump, and the range of its volume regulation is 10~100%, and the measurement accuracy is ±0.5%.

[0030] In the embodiment disclosed by the utility model, the flowmeter 4 and the second valve 6 are communicated with the feed connecting pipe 82, and the polymerization inhibitor and vinyl chloride monomer are mixed at the feed connecting pipe 82, and the high-pressure nitrogen enters the mixing pipe main body 84 through the feed connecting pipe 82.

[0031] In the embodiments disclosed in this utility model, the top of the polymerization inhibitor storage tank 1 is provided with an observation port 11 and a polymerization inhibitor inlet 12, and the inside of the polymerization inhibitor storage tank 1 is provided with a level gauge 13, so as to facilitate the observation of the liquid level change of the polymerization inhibitor in the polymerization inhibitor storage tank 1 and the addition of polymerization inhibitor.

[0032] In the embodiments disclosed in this utility model, the polymerization inhibitor inlet 12 is equipped with a stainless steel filter screen with a pore size of 0.5 to 3 mm, which is used to filter impurities in the polymerization inhibitor and prevent product contamination.

[0033] In the embodiments disclosed in this utility model, a check valve 10 is connected to the tail of the pump 9, and the diameter of the check valve 10 is in the range of DN15 to 40.

[0034] In the embodiments disclosed in this utility model, the first valve 2, the second valve 6, and the third valve 7 are all ball valves, wherein,

[0035] The design temperature of the first valve 2 and the second valve 6 is 50-150℃, and the pipe diameter range is DN15-25.

[0036] The third valve 7 is designed for temperatures ranging from 50 to 250°C, with a pipe diameter range of DN25 to 80, and features fireproof and antistatic structures.

[0037] In the embodiments disclosed in this utility model, an angle steel 841 is welded to the outer side wall of the mixing pipe body 84 for stably installing the mixing pipe body 84 on the existing ship loading and transportation production line.

[0038] The inner wall surface of the mixing pipe 8 is coated with a first anti-corrosion coating, a second anti-corrosion coating and a third anti-corrosion coating in sequence to prevent corrosion of the inner wall of the mixing pipe body 84 and damage to the equipment.

[0039] The first anti-corrosion coating is epoxy zinc-rich paint, which is applied in two layers and has a thickness of 50 micrometers; the second anti-corrosion coating is epoxy micaceous iron oxide paint, which is applied in one layer and has a thickness of 100 micrometers; and the third anti-corrosion coating is acrylic polyurethane paint, which is applied in two layers and has a thickness of 40 micrometers.

[0040] In the embodiments disclosed in this utility model, the first valve 2, flow meter 4, second valve 6, barometer 83 and third valve 7 are all electrically connected to the automatic control unit and are interlocked and controlled by the automatic control unit.

[0041] Specifically, the automatic control unit controls the first valve 2 and the third valve 7 to open at the same time, the polymerization inhibitor in the polymerization inhibitor storage tank 1 enters the feed connection pipe 82 through the first valve 2, and the vinyl chloride monomer enters the feed connection pipe 82 through the third valve 7, and the flow meter 4 monitors the polymerization inhibitor flow value and feeds back to the automatic control unit, and the automatic control unit adjusts the opening range of the first valve 2 to adjust the polymerization inhibitor flow to the preset value, and the preset value of the polymerization inhibitor flow is determined according to the flow value of the pump 9 driving the vinyl chloride monomer. By controlling the polymerization inhibitor flow, the mixing ratio of the polymerization inhibitor and the vinyl chloride monomer is kept at a stable value to ensure the polymerization effect.

[0042] After the shipment is completed, the automatic control unit controls the first valve 2 and the third valve 7 to close at the same time, and controls the second valve 6 to open, the high-pressure nitrogen in the nitrogen storage tank 5 enters the connection pipe 82, the gas pressure in the mixing pipe body 84 continuously rises, and the pressure difference between the inside of the mixing pipe body 84 and the outlet of the vinyl chloride discharge pipe 86 is formed. Under the pressure of the high-pressure nitrogen, the residual vinyl chloride monomer and polymerization inhibitor in the mixing pipe body 84 are extruded out of the mixing pipe body 84 from the vinyl chloride discharge pipe 86, reducing the residual amount and preventing waste, and ensuring the quality of subsequent products.

[0043] Among them, the gas pressure gauge 83 feeds back the gas pressure value signal to the automatic control unit, and when the gas pressure value of the gas pressure gauge 83 in the mixing pipe body 84 rises to the preset safe gas pressure value, the automatic control unit controls the second valve 6 to close, preventing the gas pressure from being too high and causing damage to the equipment.

[0044] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0045] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication between the two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] The above merely is the preferred implementation form of the present application, and it should be noted that, for the ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, and these improvements and substitutions should also be considered as the protection scope of the present application.

Claims

1. A vinyl chloride polymerization inhibitor adding apparatus comprising a polymerization inhibitor storage tank (1) to which a mixing pipe (8) for mixing vinyl chloride and a polymerization inhibitor is connected, characterized in that, The first valve (2) and the flow meter (4) are arranged between the polymerization inhibitor storage tank (1) and the mixing pipe (8), the mixing pipe (8) is also communicated with a nitrogen storage tank (5), the second valve (6) is arranged between the nitrogen storage tank (5) and the mixing pipe (8), the tail of the mixing pipe (8) is communicated with the pump (9), the air pressure gauge (83) is arranged in the mixing pipe (8), and the inlet end of the mixing pipe (8) is provided with the third valve (7). The first valve (2), the flow meter (4), the second valve (6), the air pressure gauge (83) and the third valve (7) are electrically connected with the automatic control unit and are controlled by the automatic control unit.

2. The vinyl chloride polymerization inhibitor adding device according to claim 1, wherein The polymerization inhibitor feeding port (3) is arranged between the first valve (2) and the flow meter (4), and the cover plate (31) is arranged on the polymerization inhibitor feeding port (3).

3. The vinyl chloride polymerization inhibitor adding device according to claim 1, wherein The mixing pipe (8) comprises the vinyl chloride feeding pipe (81) arranged at the inlet end of the mixing pipe (8) and communicated with the third valve (7), the feeding connecting pipe (82) communicated with the tail of the vinyl chloride feeding pipe (81), the mixing pipe body (84) communicated with the tail of the feeding connecting pipe (82), the air pressure gauge (83) arranged in the mixing pipe body (84), the discharging connecting pipe (85) communicated with the tail of the mixing pipe body (84), and the vinyl chloride discharging pipe (86) communicated with the tail of the discharging connecting pipe (85) and communicated with the pump (9).

4. The vinyl chloride polymerization inhibitor adding device according to claim 3, wherein The flow meter (4) and the second valve (6) are communicated with the feeding connecting pipe (82).

5. The vinyl chloride polymerization inhibitor adding device according to claim 1, wherein The top of the polymerization inhibitor storage tank (1) is provided with the observation port (11) and the polymerization inhibitor feeding port (12), and the liquid level gauge (13) is arranged in the polymerization inhibitor storage tank (1).

6. The vinyl chloride polymerization inhibitor adding device according to claim 5, wherein The polymerization inhibitor feeding port (12) is provided with the stainless steel filter screen, and the pore size of the filter screen is 0.5-3 mm.

7. The vinyl chloride polymerization inhibitor adding device according to claim 1, wherein The check valve (10) is communicated with the tail of the pump (9), and the pipe diameter of the check valve (10) ranges from DN15 to DN40.

8. The vinyl chloride polymerization inhibitor adding device according to claim 1, wherein The first valve (2), the second valve (6) and the third valve (7) are ball valves, The design temperature of the first valve (2) and the second valve (6) ranges from 50 to 150 DEG C, and the pipe diameter ranges from DN15 to DN25; The design temperature of the third valve (7) ranges from 50 to 250 DEG C, the pipe diameter ranges from DN25 to DN80, and the third valve (7) is provided with the fireproof and anti-static structure.

9. The vinyl chloride polymerization inhibitor adding device according to claim 3, wherein The angle steel (841) is welded to the outer side of the side wall of the mixing pipe body (84).

10. The vinyl chloride polymerization inhibitor adding device according to claim 1, wherein The inner wall surface of the mixing pipe (8) is coated with the first anticorrosive coating, the second anticorrosive coating and the third anticorrosive coating in sequence, wherein the first anticorrosive coating is the epoxy zinc-rich paint, the second anticorrosive coating is the epoxy cloud iron paint, and the third anticorrosive coating is the acrylic polyurethane paint.

Images