Polymerization inhibitor preparing and conveying device

Abstract

The utility model belongs to the technical field of chemical equipment, and particularly relates to a polymerization inhibitor preparing and conveying device. Comprising a preparation tank, the interior of the preparation tank is divided into an upper preparation cavity and a lower finished product cavity through a partition plate, and an overflow guide pipe is arranged between the preparation cavity and the finished product cavity; the top of the preparation cavity is respectively connected with a polymerization inhibitor feeding pipeline, a desalted water pipeline and a reuse water pipeline; a bottom outlet of the finished product cavity is connected with three conveying branches which are connected in parallel; each conveying branch is sequentially provided with a polymerization inhibitor conveying pump, a pulse damper and a mass flow meter; wherein the first conveying branch is connected to a middle inlet of the quenching absorption tower, the second conveying branch is connected to an upper inlet of the quenching absorption tower, and the third conveying branch is respectively connected to the upper inlet and the middle inlet of the quenching absorption tower through a three-way valve. Through reasonable layout and function integration, accurate preparation and stable conveying of materials are guaranteed, meanwhile, continuous and stable feeding is guaranteed through the multi-path conveying design, and the continuity and stability of the production process are effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment, and particularly relates to an inhibitor preparation and conveying device. Background Art

[0002] In the field of chemical production, especially in the process involving easily polymerizable substances such as acrylic acid, the application of inhibitors is crucial. Inhibitors can effectively prevent the occurrence of unwanted polymerization reactions during the production, storage, and transportation of materials, thereby ensuring the stability of production and product quality. However, in actual production, there are many challenges in the preparation and transportation of inhibitors. On the one hand, the preparation of inhibitors requires precise control of the proportions of various raw materials and the mixing effect to ensure its stable performance and meet the process requirements; on the other hand, during the transportation process, it is necessary to ensure that the inhibitor can reach the designated position stably and accurately, and at the same time, avoid affecting its use effect due to fluctuations or impurities during transportation. Traditional inhibitor preparation and conveying devices often have problems such as simple structure and single function, and it is difficult to meet the requirements of modern chemical production in terms of preparation accuracy, transportation stability, and environmental protection. For example, during the preparation process, accurate metering and sufficient mixing of raw materials may not be achieved, resulting in unstable inhibitor performance; during the transportation process, problems such as unstable transportation pressure or blockage of pipelines by impurities may affect the normal supply of inhibitors, thereby affecting the smooth progress of the entire production process. Therefore, it is of great significance to develop a device that can efficiently and stably complete the preparation and transportation of inhibitors. Summary of the Utility Model

[0003] Aiming at the above deficiencies in the prior art, the purpose of the utility model is to provide an inhibitor preparation and conveying device, which realizes the recycling of process water through reasonable layout and function integration, ensures the accurate preparation and stable transportation of materials, and at the same time ensures continuous and stable feeding through a double filter and a multi-channel transportation design, effectively improving the continuity and stability of the production process.

[0004] The utility model is implemented by adopting the following technical solutions:

[0005] The inhibitor preparation and transportation device described above includes a preparation tank. Inside the preparation tank, a partition divides it into an upper preparation chamber and a lower finished product chamber. An overflow conduit is provided between the preparation chamber and the finished product chamber. The top of the preparation chamber is respectively connected to an inhibitor feeding pipeline, a desalinated water pipeline, and a recycled water pipeline. The inlet of the recycled water pipeline is connected to the process water outlet of the acrylic acid refining unit. Two filters are arranged in parallel on the bottom outlet pipeline of the finished product chamber. The outlets of the filters are connected to three parallel transportation branches. On each transportation branch, an inhibitor transportation pump, a pulsation damper, and a mass flowmeter are successively arranged. Among them, the first transportation branch is connected to the middle inlet of the quench absorption tower, the second transportation branch is connected to the upper inlet of the quench absorption tower, and the third transportation branch is respectively connected to the upper and middle inlets of the quench absorption tower through a three-way valve. Each pulsation damper is connected to a nitrogen pressure compensation branch pipe.

[0006] A high-level overflow pipeline is connected to the top end of the side wall of the described preparation chamber, and a drain pipeline is connected to the bottom of the finished product chamber. Liquid level gauges are respectively installed on the side walls of the preparation chamber and the finished product chamber.

[0007] The outlets of the high-level overflow pipeline and the drain pipeline are both connected to a collection tank.

[0008] A jacketed heat tracing pipe is arranged on the outer wall of the preparation tank, and electric heat tracing tapes are wound around each transportation pipeline.

[0009] A breather valve is provided at the top of the preparation chamber, and the outlet of the breather valve is connected to a tail gas absorption device.

[0010] A pressure reducing valve and a pressure gauge are provided on the nitrogen pressure compensation branch pipe.

[0011] The working principle of the inhibitor preparation and transportation device is as follows:

[0012] The inhibitor feeding pipeline, the desalinated water pipeline, and the recycled water pipeline are respectively connected to the top of the preparation chamber. Among them, the inlet of the recycled water pipeline is connected to the process water outlet of the acrylic acid refining unit, realizing the recycling of process water. During the preparation process, the inhibitor, desalinated water, and recycled water are added into the preparation chamber through these pipelines, and the materials are fully mixed by the stirring mechanism in the preparation chamber. After the preparation is completed and the inspection is qualified, the liquid in the preparation chamber flows into the lower finished product chamber through the overflow conduit, realizing the liquid transfer between the preparation chamber and the finished product chamber. The top end of the side wall of the preparation chamber is connected with a high-level overflow pipeline. When the liquid level is too high, the excess liquid can be discharged through the high-level overflow pipeline; the bottom of the finished product chamber is connected with a drain pipeline, which is used to drain the liquid in the finished product chamber before maintenance. At the same time, level gauges are respectively installed on the side walls of the preparation chamber and the finished product chamber, which can monitor the liquid level in real time to ensure the safety and stability of the preparation and storage processes. In addition, a jacketed heating pipe is provided on the outer wall of the preparation tank, and electric tracing tapes are wound on each conveying pipeline, which can adjust the temperature in real time according to the environmental conditions to ensure that the inhibitor is prepared and transported under suitable temperature conditions and prevent low-temperature crystallization. A breathing valve is also provided at the top of the preparation chamber, and the outlet of the breathing valve is connected to a tail gas absorption device, which can timely discharge the gas generated during the preparation process and introduce it into the tail gas absorption device for treatment to avoid environmental pollution.

[0013] Two filters are arranged in parallel on the bottom outlet pipeline of the finished product chamber to filter impurities in the inhibitor. One is for standby, avoiding shutdown caused by the blockage of a single filter and ensuring the continuity of transportation. The filtered inhibitor enters three parallel conveying branches. On each conveying branch, an inhibitor conveying pump, a pulsation damper, and a mass flowmeter are arranged in sequence. The inhibitor conveying pump provides power for the transportation of the inhibitor. The function of the pulsation damper is to reduce the pressure fluctuation caused by the pulsation of the pump during transportation and ensure the metering accuracy of the mass flowmeter. The mass flowmeter is used to accurately measure the flow rate of the transported inhibitor to ensure the accuracy of the transportation volume. Each pulsation damper is connected with a nitrogen pressure compensation branch pipe, and a pressure reducing valve and a pressure gauge are arranged on the nitrogen pressure compensation branch pipe, which can supplement nitrogen into the pulsation damper as needed to maintain the stability of its internal pressure. The first conveying branch and the second conveying branch are respectively directed to the middle and upper inlets of the quench absorption tower. The third conveying branch is used as a standby branch. When sudden situations such as transportation failures, abnormal fluctuations in flow rate, or emergency process adjustments occur in the first conveying branch or the second conveying branch, it can realize dynamic distribution through a three-way valve, quickly take over the transportation tasks of the corresponding branches, ensure the continuous and stable supply of the inhibitor to the quench absorption tower, meet the injection requirements of different process stages, and ensure the continuity and stability of the entire production process.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] The inhibitor preparation and conveying device described in the present utility model significantly improves the overall efficiency and operation reliability of the inhibitor preparation and conveying system through an integrated structural design and coordinated function optimization. The device adopts a separated layout of a preparation chamber and a finished product chamber, combined with multi-level liquid level control of an overflow conduit and a high-level overflow pipeline, realizing seamless connection of continuous inhibitor preparation and buffer storage, avoiding process interference in the traditional single-chamber design, and ensuring the continuity of the production process. The redundant configuration of double filters and the dynamic switching mechanism of three parallel conveying branches form multiple safeguards, effectively coping with abnormal conditions such as filter blockage and branch failure, and greatly reducing the risk of shutdown. Through the closed-loop design of the recycled water pipeline and the tail gas absorption device, the process water is recycled and volatile substances are recovered directionally, taking into account both resource conservation and environmental protection requirements. The cooperative temperature control system of jacket heating and electric heating tapes, and the pressure stabilization technology of pulse dampers and nitrogen pressure supplementation stabilize the conveying conditions from the dual dimensions of temperature and pressure, ensuring accurate metering of the inhibitor flow rate and conveying stability. The entire device significantly improves the adaptability and safety of the inhibitor injection process in the acrylic acid production system through modular function integration and intelligent control. Brief Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the inhibitor preparation and conveying device described in the present utility model;

[0017] In the figure: 1, preparation tank; 2, preparation chamber; 3, finished product chamber; 4, overflow conduit; 5, inhibitor feeding pipeline; 6, desalinated water pipeline; 7, recycled water pipeline; 8, acrylic acid refining unit; 9, filter; 10, inhibitor conveying pump; 11, pulse damper; 12, mass flowmeter; 13, first conveying branch; 14, second conveying branch; 15, third conveying branch; 16, quench absorption tower; 17, nitrogen pressure supplementation branch pipe; 18, high-level overflow pipeline; 19, drain pipeline; 20, liquid level gauge; 21, collection tank; 22, jacket heating pipe; 23, electric heating tape; 24, breathing valve; 25, tail gas absorption device; 26, pressure reducing valve; 27, pressure gauge. Detailed Embodiments

[0018] In order to make the purpose and technical solutions of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0019] Example 1

[0020] As Figure 1As shown in the figure, the inhibitor preparation and conveying device includes a preparation tank 1. Inside the preparation tank 1, a partition divides it into an upper preparation chamber 2 and a lower finished product chamber 3. An overflow conduit 4 is provided between the preparation chamber 2 and the finished product chamber 3. At the top of the preparation chamber 2, an inhibitor feeding pipeline 5, a desalinated water pipeline 6, and a recycled water pipeline 7 are respectively connected. The inlet of the recycled water pipeline 7 is connected to the process water outlet of the acrylic acid refining unit 8. On the bottom outlet pipeline of the finished product chamber 3, two filters 9 are arranged in parallel. The outlet of the filter 9 is connected to three parallel conveying branches. On each conveying branch, an inhibitor conveying pump 10, a pulsation damper 11, and a mass flowmeter 12 are successively arranged. Among them, the first conveying branch 13 is connected to the middle inlet of the quench absorption tower 16, the second conveying branch 14 is connected to the upper inlet of the quench absorption tower 16, and the third conveying branch 15 is respectively connected to the upper and middle inlets of the quench absorption tower 16 through a three-way valve. Each pulsation damper 11 is connected with a nitrogen pressure compensation branch pipe 17.

[0021] At the top end of the side wall of the preparation chamber 2, a high-level overflow pipeline 18 is connected. At the bottom of the finished product chamber 3, a drain pipeline 19 is connected. Liquid level gauges 20 are respectively installed on the side walls of the preparation chamber 2 and the finished product chamber 3.

[0022] The outlets of the high-level overflow pipeline 18 and the drain pipeline 19 are both connected to a collection tank 21.

[0023] A jacketed heat tracing pipe 22 is arranged on the outer wall of the preparation tank 1, and electric heat tracing tapes 23 are wound around each conveying pipeline.

[0024] At the top of the preparation chamber 2, a breather valve 24 is provided, and the outlet of the breather valve 24 is connected to a tail gas absorption device 25.

[0025] On the nitrogen pressure compensation branch pipe 17, a pressure reducing valve 26 and a pressure gauge 27 are provided.

[0026] During operation, the specific process is as follows:

[0027] 1) Inhibitor preparation stage:

[0028] The inhibitor feeding pipeline 5, the desalinated water pipeline 6, and the recycled water pipeline 7 are respectively connected to the top of the preparation chamber 2 in the upper part of the preparation tank 1. Among them, the inlet of the recycled water pipeline 7 is connected to the process water outlet of the acrylic acid refining unit 8 to realize the recycling of process water. During the preparation process, according to the preset ratio requirements, the inhibitor, desalinated water, and recycled water are introduced into the preparation chamber 2 through the above pipelines. A stirring mechanism is equipped in the preparation chamber 2. After the raw materials are introduced, the stirring mechanism is started to fully stir and mix the materials in the preparation chamber 2, so that the inhibitor, desalinated water, and recycled water are evenly mixed to form an inhibitor solution that meets the process requirements. When the inhibitor solution in the preparation chamber 2 is prepared and tested qualified, the solution flows from the preparation chamber 2 into the lower finished product chamber 3 through the overflow conduit 4, realizing the liquid transfer between the preparation chamber 2 and the finished product chamber 3.

[0029] Level gauges 20 are respectively installed on the side walls of the preparation chamber 2 and the finished product chamber 3 to monitor the liquid levels in the two chambers in real time. The top end of the side wall of the preparation chamber 2 is connected to a high-level overflow pipeline 18. When the liquid level in the preparation chamber 2 is too high, the excess liquid can be discharged through the high-level overflow pipeline 18 to avoid waste or safety hazards caused by liquid overflow. The bottom of the finished product chamber 3 is connected to a drain pipeline 19. Before the device is overhauled, the inhibitor solution in the finished product chamber 3 can be drained through the drain pipeline 19.

[0030] A jacketed heat tracing pipe 22 is provided on the outer wall of the preparation tank 1, and electric heat tracing tapes 23 are wound around each conveying pipeline. According to the environmental temperature and the property requirements of the inhibitor, by controlling the heating power of the jacketed heat tracing pipe 22 and the electric heat tracing tape 23, the temperature of the preparation tank 1 and the conveying pipeline is adjusted in real time to ensure that the inhibitor is prepared under suitable temperature conditions, preventing the inhibitor from crystallizing due to low temperature and affecting its performance.

[0031] A breathing valve 24 is provided at the top of the preparation chamber 2, and the outlet of the breathing valve 24 is connected to a tail gas absorption device 25. During the preparation process, the volatile gases generated in the preparation chamber 2 are timely discharged to the tail gas absorption device 25 through the breathing valve 24 for treatment to avoid environmental pollution caused by gas leakage.

[0032] 2) Inhibitor transportation stage:

[0033] Two filters 9 are arranged in parallel on the bottom outlet pipeline of the finished product chamber 3, one for standby and one for use. After the inhibitor solution flows out of the finished product chamber 3, it first enters the filter 9 for filtration to remove the impurities therein to ensure the quality of the transported inhibitor. When one of the filters 9 is blocked or fails, it can be switched to the other filter 9 to continue working, avoiding shutdown caused by the blockage of a single filter 9 and ensuring the continuity of transportation.

[0034] The filtered inhibitor solution enters three parallel conveying branches. On each conveying branch, there are an inhibitor transfer pump 10, a pulsation damper 11, and a mass flowmeter 12 arranged in sequence. The inhibitor transfer pump 10 provides power for the conveying of the inhibitor solution, and conveys the inhibitor solution from the finished product chamber 3 to the designated position. The function of the pulsation damper 11 is to reduce the pressure fluctuation caused by the pulsation of the pump during the conveying process, and ensure the measurement accuracy of the mass flowmeter 12. Each pulsation damper 11 is connected with a nitrogen pressure compensation branch pipe 17, and a pressure reducing valve 26 and a pressure gauge 27 are arranged on the nitrogen pressure compensation branch pipe 17. According to the pressure condition in the pulsation damper 11, the nitrogen pressure of the nitrogen pressure compensation branch pipe 17 can be adjusted through the pressure reducing valve 26 to supplement nitrogen into the pulsation damper 11 to maintain the stability of its internal pressure. The mass flowmeter 12 is used to accurately measure the flow rate of the conveyed inhibitor solution, ensure the accuracy of the conveying volume, and provide data support for the precise control of the production process.

[0035] The first conveying branch 13 is connected to the middle inlet of the quench absorption tower 16, the second conveying branch 14 is connected to the upper inlet of the quench absorption tower 16, and the third conveying branch 15 serves as a standby branch and is connected to the upper and middle inlets of the quench absorption tower 16 through a three-way valve respectively. Under normal production conditions, the first conveying branch 13 and the second conveying branch 14 respectively convey the inhibitor solution to the middle and upper inlets of the quench absorption tower 16 according to the preset process requirements. When sudden situations such as a conveying failure (such as pump damage, pipeline blockage, etc.), abnormal flow fluctuation, or process emergency adjustment occur in the first conveying branch 13 or the second conveying branch 14, the third conveying branch 15 can achieve dynamic distribution through the three-way valve, quickly take over the conveying task of the corresponding branch, ensure the continuous and stable supply of the inhibitor solution to the quench absorption tower 16, meet the injection requirements of different process stages, and ensure the continuity and stability of the entire production process.

Claims

1. A polymerization inhibitor preparation and conveying device, characterized in that, It includes a preparation tank (1). Inside the preparation tank (1), a partition is used to separate an upper preparation chamber (2) and a lower finished product chamber (3). An overflow conduit (4) is provided between the preparation chamber (2) and the finished product chamber (3). At the top of the preparation chamber (2), a polymerization inhibitor feeding pipeline (5), a desalinated water pipeline (6), and a recycled water pipeline (7) are respectively connected. The inlet of the recycled water pipeline (7) is connected to the process water outlet of the acrylic acid refining unit (8). On the bottom outlet pipeline of the finished product chamber (3), two filters (9) are arranged in parallel. The outlet of the filter (9) is connected with three parallel conveying branches. On each conveying branch, a polymerization inhibitor conveying pump (10), a pulsation damper (11), and a mass flowmeter (12) are successively arranged. Among them, the first conveying branch (13) is connected to the middle inlet of the quench absorption tower (16), the second conveying branch (14) is connected to the upper inlet of the quench absorption tower (16), and the third conveying branch (15) is respectively connected to the upper and middle inlets of the quench absorption tower (16) through a three-way valve. Each pulsation damper (11) is connected with a nitrogen pressure compensation branch pipe (17).

2. The inhibitor formulation conveying device according to claim 1, wherein, At the top of the side wall of the said preparation chamber (2), a high-level overflow pipeline (18) is connected. At the bottom of the finished product chamber (3), a draining pipeline (19) is connected. Liquid level gauges (20) are respectively installed on the side walls of the preparation chamber (2) and the finished product chamber (3).

3. The inhibitor formulation and conveying device according to claim 2, characterized in that, The outlets of the said high-level overflow pipeline (18) and the draining pipeline (19) are both connected to a collection tank (21).

4. The inhibitor formulation and conveying device according to claim 1, wherein, A jacketed heat tracing pipe (22) is arranged on the outer wall of the said preparation tank (1). Electric heat tracing tapes (23) are wound on each conveying pipeline.

5. The inhibitor formulation and delivery device according to claim 1, wherein A breather valve (24) is provided at the top of the said preparation chamber (2). The outlet of the breather valve (24) is connected to a tail gas absorption device (25).

6. The inhibitor formulation and conveying device according to claim 1, wherein A pressure reducing valve (26) and a pressure gauge (27) are provided on the said nitrogen pressure compensation branch pipe (17).

Images