Drainage device of dimethyl oxalate or ethylene glycol rectification reboiler in coal chemical industry

Abstract

The utility model belongs to the technical field of coal chemical industry rectification, and particularly relates to a water draining device of a coal chemical industry dimethyl oxalate or ethylene glycol rectification reboiler. According to the utility model, the drain tank, the liquid level detection device and the regulating valve are arranged, and the regulating valve is controlled by the automatic control system to regulate and control the liquid level of the drain tank, so that condensate water in the reboiler can be timely and stably discharged; consequently, accumulation of condensate water in the reboiler is avoided, efficient hydrophobic performance is achieved, and efficient heat transfer efficiency of the reboiler is guaranteed. In addition, the drain tank further has a liquid sealing function, steam is prevented from penetrating through the adjusting valve, and therefore steam consumption is reduced. The device also has the advantages that the structure is simple, the design is reasonable, the maintenance cost and the failure rate of equipment are reduced, the adaptability to different working conditions is stronger, the stability and the reliability of the whole rectification system are improved, and the production efficiency and the product quality of dimethyl oxalate rectification or ethylene glycol rectification can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of coal chemical distillation technology, specifically a hydrophobic device for a coal chemical dimethyl oxalate or ethylene glycol distillation reboiler. Background Technology

[0002] In coal chemical production, the distillation process of dimethyl oxalate or ethylene glycol is crucial, and the reboiler is a key piece of equipment in the distillation system. The heating medium for the reboiler is steam, which generates a large amount of condensate during the heating process. This condensate is regulated and discharged through steam traps, and efficient condensate discharge plays a vital role in the stable operation of the reboiler. However, in actual industrial production, steam traps often fail to effectively discharge condensate, causing it to accumulate inside the reboiler. This affects the heating effect, leading to fluctuations in system pressure and liquid level in the distillation column, thus impacting the distillation efficiency and effectiveness of the dimethyl oxalate or ethylene glycol distillation unit. In severe cases, it can even affect the quality of the distilled product. Sometimes, steam can even penetrate the steam trap, resulting in steam waste. Especially when steam traps have been in use for a long time, the failure rate is extremely high, highlighting the inherent drawbacks of traditional steam traps: low efficiency and frequent malfunctions. Utility Model Content

[0003] Based on the existing technical problems, this utility model provides a condensate draining device for a reboiler in a coal chemical dimethyl oxalate or ethylene glycol distillation unit. This utility model enables the efficient discharge of condensate generated in the reboiler of the coal chemical dimethyl oxalate or ethylene glycol distillation unit, allowing the reboiler to stably provide a heat source to the distillation column, ensuring the distillation effect and efficiency of the distillation column, as well as stabilizing product quality; at the same time, it avoids steam passing through the condensate draining device and wasting steam, and also avoids vibration of the condensate pipeline.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A condensate trap for a reboiler used in the distillation of dimethyl oxalate or ethylene glycol in coal chemical industry includes a reboiler and a condensate trap. The condensate outlet at the bottom of the reboiler is connected to the condensate trap via a pipe. The condensate trap is positioned below the condensate outlet at the bottom of the reboiler, and the pipe connecting the condensate outlet to the condensate trap cannot be higher than the condensate outlet at the bottom of the reboiler. The condensate outlet of the condensate trap is connected to a condensate collection tank via a drain pipe. A balancing pipe is also provided at the top of the condensate trap and connected to the reboiler. A regulating valve is installed on the drain pipe. A liquid level detection device is installed in the condensate trap. The regulating valve is connected to the liquid level detection device via an automatic control system.

[0006] Furthermore, the reboiler includes a light-removal tower reboiler and a dimethyl carbonate separation tower reboiler in a dimethyl oxalate distillation unit, and a methanol recovery tower reboiler, a dehydration tower reboiler, a deethanolination tower reboiler, an ethylene glycol product tower reboiler, and an ethylene glycol recovery tower reboiler in an ethylene glycol distillation unit.

[0007] Furthermore, the liquid level detection device is any one of a magnetostrictive liquid level gauge, a radar liquid level gauge, a capacitive intelligent liquid level gauge, or a magnetic float liquid level gauge.

[0008] Furthermore, the regulating valve is provided with a bypass pipeline, and a control valve is installed on the bypass pipeline. Beneficial effects

[0009] 1. This utility model sets up a condensate trap, a liquid level detection device, and a regulating valve, and uses an automatic control system to control the regulating valve to regulate the liquid level in the condensate trap, so that the condensate in the reboiler can be discharged in a timely and stable manner. This utility model has more efficient condensation performance, can discharge the condensate in the reboiler in a timely manner, and ensure the heat transfer efficiency of the reboiler. At the same time, it avoids steam from passing through the condensate trap and wasting steam, and also avoids vibration of the condensate pipeline.

[0010] 2. The present invention has a reasonable structural design, which reduces the maintenance cost and failure rate of the equipment.

[0011] 3. This utility model has stronger adaptability to different working conditions, improves the stability and reliability of the entire distillation system, and can improve the production efficiency and product quality of dimethyl oxalate distillation or ethylene glycol distillation. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] In the diagram: 1-Steam pipe; 2-Balancing pipe; 3-Drain tank; 4-Reboiler; 5-Regulating valve; 6-Drain pipe. Detailed Implementation Example 1

[0014] Reference Figure 1In order to ensure that the steam condensate in the reboilers of the light oxalate distillation unit and the dimethyl carbonate separation unit, as well as the reboilers of the methanol recovery tower, dehydration tower, alcohol removal tower, ethylene glycol product tower, and ethylene glycol recovery tower in the ethylene glycol distillation unit can be discharged in a timely manner, thereby improving the heat transfer efficiency of the reboilers; at the same time, it is necessary to avoid excessive steam discharge caused by excessive condensate discharge, thereby saving steam consumption. This invention provides a condensate trap for a reboiler used in the distillation of dimethyl oxalate or ethylene glycol in coal chemical processes. The reboiler includes a reboiler 4 and a condensate trap 3. The steam inlet at the top of the reboiler 4 is connected to a steam pipe 1. The condensate outlet at the bottom of the reboiler 4 is connected to the condensate trap 3 via a pipe. The condensate trap 3 is positioned below the condensate outlet at the bottom of the reboiler 4, and the pipe connecting the condensate outlet to the condensate trap 3 cannot be higher than the condensate outlet at the bottom of the reboiler 4. The condensate outlet of the condensate trap 3 is connected to a condensate collection tank via a drain pipe 6. A balance pipe 2 is also provided at the top of the condensate trap 3, connecting it to the reboiler 4, which facilitates the drainage of condensate from the reboiler 4 into the condensate trap. In section 3; a regulating valve 5 is installed on the drainage pipe 6; a liquid level detection device is installed on the condensate tank 3; the regulating valve 5 is connected to the liquid level detection device via an automatic control system, and under the action of the control system, the regulating valve 5 automatically adjusts the liquid level of the condensate tank 3; the reboiler 4 includes a light oxalate distillation unit light oxalate removal tower reboiler 4 and a dimethyl carbonate separation tower reboiler 4, an ethylene glycol distillation unit methanol recovery tower reboiler 4, a dehydration tower reboiler 4, a deethanolination tower reboiler 4, an ethylene glycol product tower reboiler 4, and an ethylene glycol recovery tower reboiler 4; the liquid level detection device is a magnetostrictive level gauge; the regulating valve 5 is provided with a bypass pipe, and a control valve is installed on the bypass pipe.

[0015] Another embodiment differs from Embodiment 1 in that the liquid level detection device is a radar liquid level gauge.

[0016] Another embodiment differs from Embodiment 1 in that the liquid level detection device is a capacitive intelligent liquid level gauge.

[0017] Another embodiment differs from Embodiment 1 in that the liquid level detection device is a magnetic float level gauge.

[0018] The working material of this utility model: This utility model sets up a condensate tank 3, a liquid level detection device, and a regulating valve 5, and uses an automatic control system to control the regulating valve 5 to regulate the liquid level of the condensate tank 3, so that the condensate in the reboiler 4 can be discharged in a timely and stable manner; thereby avoiding the accumulation of condensate in the reboiler 4, it has efficient hydrophobic performance and ensures the high heat transfer efficiency of the reboiler 4; in addition, the condensate tank 3 of this utility model also has the function of liquid sealing, preventing steam from penetrating the regulating valve 5, thereby saving steam consumption; this utility model also has a simple and reasonable structure, reduces equipment maintenance costs and failure rate, has stronger adaptability to different working conditions, improves the stability and reliability of the entire distillation system, and can improve the production efficiency and product quality of dimethyl oxalate distillation or ethylene glycol distillation.

[0019] Modifications and variations made to this invention by those skilled in the art are all within the scope of the patent of this invention, and are not limited to the embodiments described.

Claims

1. A hydrophobic device for a coal chemical dimethyl oxalate or ethylene glycol rectifying reboiler, characterized in that: The condensate outlet at the bottom of the reboiler is connected to the condensate tank by a pipeline, the condensate tank is arranged lower than the condensate outlet at the bottom of the reboiler, and the pipeline connecting the condensate outlet at the bottom of the reboiler to the condensate tank cannot be higher than the condensate outlet at the bottom of the reboiler; the condensate outlet of the condensate tank is connected to the condensate collecting tank by a drainage pipeline; the top of the condensate tank is further provided with a balance pipeline in communication with the reboiler; an adjusting valve is arranged on the drainage pipeline; the condensate tank is provided with a liquid level detection device; the adjusting valve is signal connected to the liquid level detection device through an automatic control system; the balance pipeline is used to maintain the pressure balance between the reboiler and the condensate tank, prevent steam from penetrating the adjusting valve, and realize the liquid sealing function.

2. The hydrophobic device of a coal chemical dimethyl oxalate or ethylene glycol rectifying reboiler according to claim 1, characterized in that: The reboiler includes a dimethyl oxalate rectification device, a dimethyl carbonate separation tower reboiler, a methanol recovery tower reboiler, a dehydration tower reboiler, a dealcoholization tower reboiler, a glycol product tower reboiler, and a glycol recovery tower reboiler of a glycol rectification device.

3. The hydrophobic device of a coal chemical dimethyl oxalate or ethylene glycol rectifying reboiler according to claim 1, characterized in that: The liquid level detection device is any one of a magnetostrictive liquid level meter, a radar liquid level meter, a capacitive intelligent liquid level meter, and a magnetic reed liquid level meter.

4. The hydrophobic device for the oxalic acid dimethyl ester or ethylene glycol rectifying reboiler of coal chemical industry according to any one of claims 1-3, characterized in that: The adjusting valve is provided with a bypass pipeline, and a control valve is arranged on the bypass pipeline.

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