Automatic drainage device for conveying pipeline for preparing acetylene through calcium carbide method

Abstract

The utility model discloses an automatic drainage device for a conveying pipeline for preparing acetylene by a calcium carbide method, which is characterized in that the bottom of the acetylene conveying pipeline is communicated with a pipeline water collecting bag, and the bottom of the pipeline water collecting bag is communicated with a condensate water collecting tank through a first drainage pipeline; the top of the condensate water collecting tank is provided with a gas phase balance pipe communicated with an acetylene conveying pipeline and a nitrogen conveying pipeline communicated with a nitrogen header pipe, and the condensate water collecting tank is further provided with a liquid level meter; the bottom of the condensate water collecting tank is communicated with a second drainage pipeline; a drainage pipe outlet regulating valve is arranged on the second drainage pipeline; a combustible gas alarm is arranged at the position of the drainage pipe outlet adjusting valve, the combustible gas alarm and the liquid level meter are electrically connected with the signal input end of the PLC, and the signal output end of the PLC is electrically connected with the drainage pipe outlet adjusting valve. Deposition condensate water in the acetylene conveying pipeline is settled to the condensate water collecting tank through gravity, remote interlocking is achieved through the PLC, the purpose of automatic drainage is achieved, and intelligence and safety are achieved.

Description

Technical Field

[0001] The utility model relates to the field of chemical production equipment, in particular to an automatic drainage device for a conveying pipeline for preparing acetylene by a calcium carbide method. Background Art

[0002] In the production of calcium carbide acetylene, the main process is to use an acetylene generator to hydrolyze calcium carbide to produce acetylene gas for use in subsequent processes. To ensure the purity of the acetylene, an acetylene purification system is usually installed after the acetylene generator. Depending on the impurities contained in the acetylene gas, a water scrubber, a drying tower, and an alkaline scrubber are installed to purify the acetylene gas to ensure a purity of ≥98.5%. The gas is then transported to subsequent production processes via pipelines using a water ring compressor. However, the production, purification, and transportation of calcium carbide acetylene, especially when acetylene is transported over longer distances, can significantly increase the water content of the acetylene pipeline.

[0003] The high water content in acetylene pipelines will cause the following problems: (1) In order to ensure the quality of products produced in subsequent processes and the safe operation of equipment, it is necessary to add a special water removal device to remove water from acetylene, which will increase production costs. At the same time, when the temperature is low in winter, acetylene pipelines are prone to freezing, which can easily lead to process and production safety accidents. The energy consumption required to make pipelines antifreeze and heat preservation is high; (2) In order to ensure that the acetylene pipelines are thoroughly drained, manual drainage is required regularly or irregularly, resulting in a large amount of manual labor. At the same time, acetylene is a Class A flammable gas, and manual drainage carries the risk of fire and explosion, posing a great safety hazard. Utility Model Content

[0004] The utility model provides an automatic drainage device for a conveying pipeline for preparing acetylene by the calcium carbide method, aiming to solve the problems that the acetylene pipeline has a high water content and is prone to freezing in winter, while the existing water removal device has high cost and energy consumption and has great safety hazards in manual drainage.

[0005] To achieve its purpose, the utility model adopts the following technical solutions:

[0006] An automatic drainage device for a conveying pipeline for preparing acetylene by the calcium carbide method comprises an acetylene conveying pipeline, wherein the bottom of the acetylene conveying pipeline is connected to a pipeline water collecting bag, and the bottom of the pipeline water collecting bag is connected to a condensate collecting tank through a first drainage pipeline; a gas phase balance pipe is provided on the top of the condensate collecting tank to be connected to the acetylene conveying pipeline, a nitrogen conveying pipeline is provided on the top of the condensate collecting tank to be connected to a nitrogen main pipe, and a liquid level gauge is also provided on the condensate collecting tank; a second drainage pipeline is connected to the bottom of the condensate collecting tank, and a drainage pipe outlet regulating valve is provided on the second drainage pipeline; a combustible gas alarm is provided at the drainage pipe outlet regulating valve, the combustible gas alarm and the liquid level gauge are respectively electrically connected to the signal input end of a PLC programmable controller, and the signal output end of the PLC programmable controller is electrically connected to the drainage pipe outlet regulating valve.

[0007] Furthermore, the combustible gas alarm is installed within a radius of 1m of the outer circle of the drain pipe outlet regulating valve.

[0008] Furthermore, the vertical distance between the bottom of the first drainage pipe and the bottom of the condensate collection tank is ≤150 mm.

[0009] Furthermore, the liquid level gauge is a remote liquid level gauge.

[0010] Furthermore, valves are provided on the first drainage pipe, the gas phase balance pipe and the nitrogen delivery pipe.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] This automatic drainage device utilizes the principle of gas phase equilibrium to gravity-settle condensed water within the acetylene delivery pipeline into a condensate collection tank. This system then automatically drains the water using a remote interlocking function via a programmable logic controller (PLC). A combustible gas alarm is installed within the device area and interlocks with the PLC control system to provide a combustible gas leak alarm. This intelligent, safe, and convenient system is also highly reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the automatic drainage device of the present utility model;

[0014] In the figure: 1- acetylene delivery pipeline; 2- pipeline water collection bag; 3- first drainage pipeline; 4- condensate collection tank; 5- gas phase balance pipe; 6- second drainage pipeline; 7- level gauge; 8- drainage pipe outlet regulating valve; 9- PLC programmable controller; 10- combustible gas alarm; 11- nitrogen delivery pipeline; 12- valve. DETAILED DESCRIPTION

[0015] The present invention will be further described below with reference to the accompanying drawings:

[0016] like Figure 1As shown, the utility model is an automatic drainage device for a conveying pipeline for producing acetylene by the calcium carbide process, comprising an acetylene conveying pipeline 1, the bottom of which is connected to a pipe water collection bag 2. The bottom of the pipe water collection bag 2 is connected to a condensate collection tank 4 via a first drainage pipe 3. The vertical distance between the bottom of the first drainage pipe 3 and the bottom of the condensate collection tank 4 is 150 mm. The condensate collection tank 4 is a horizontal storage tank with a volume of 3 m³. A gas phase balancing pipe 5 is provided at the top of the condensate collection tank 4 and is connected to the acetylene conveying pipeline 1 via a valve pipe. This ensures that the gas phase of the drainage between the acetylene conveying pipeline 1 and the pipe water collection bag 2 is unobstructed, ensuring that accumulated water in the acetylene conveying pipeline 1 is discharged to the condensate collection tank by gravity. A nitrogen delivery pipe 11 is installed at the top of the condensate collection tank 4, connecting to the nitrogen main. A remote-controlled liquid level gauge 7 is also installed on the condensate collection tank 4. A second drain pipe 6 is connected to the bottom of the condensate collection tank 4, which is equipped with a drain outlet regulating valve 8. A combustible gas alarm 10 is installed at a radius of 0.9m around the outer ring of the drain outlet regulating valve 8 to ensure that a leak or other condition is promptly detected during the automatic drainage process, alerting the operator to take emergency measures. The combustible gas alarm 10 and the liquid level gauge 7 are each electrically connected to the signal input terminal of a programmable logic controller (PLC), while the signal output terminal of the PLC is electrically connected to the drain outlet regulating valve 8.

[0017] Before the system is put into operation, all pipes and fittings in the system are pressure-tested at 1.0 MPa to prevent leaks during production. Metal spiral-wound gaskets are used at all pipe flange connections, and anti-static jumpers are installed. The system is then air-tightened using nitrogen. After the air-tightness test is complete, nitrogen replacement is performed, with the nitrogen oxygen content in the system required to be ≤0.2%. Finally, all valves 12 on the nitrogen collector pipe 11 at the top of the condensate collection tank 4 are closed. The outlet regulating valve 8 of the drain pipe at the bottom of the condensate collection tank 4 is closed. All valves 12 on the first drain pipe 3 at the bottom of the water collection bag 2 are opened. All valves 12 on the gas phase balancing pipe 5 are opened. The valve at the base of the level gauge 4 in the condensate collection tank 4 is opened.

[0018] When the system is operational, an interlock is established between the combustible gas alarm 10, the liquid level gauge 7, the PLC programmable controller, and the drain outlet regulating valve 8. When the liquid level gauge 7 detects that the liquid level in the condensate collection tank 4 is ≥50%, the PLC programmable controller sends a signal to control the drain outlet regulating valve 8 to open automatically for drainage. When the liquid level gauge 7 detects that the liquid level in the condensate collection tank 4 is ≤20%, the PLC programmable controller sends a signal to control the drain outlet regulating valve 8 to close automatically for drainage, thus achieving intelligent control. When the combustible gas alarm 10's lower alarm threshold reaches 10ppm, the PLC programmable controller issues an audible and visual alarm, alerting on-site personnel to conduct a leak inspection and confirmation.

[0019] This device features a closed collection and drainage system that utilizes the principle of gas phase equilibrium to gravity-settle condensed water within the acetylene delivery pipeline 2 to a condensate collection tank 4. This system then automatically drains the water using a remote interlocking PLC controller. A combustible gas alarm is installed within the device area and interlocked with the PLC control system to provide intelligent and safe flammable gas leak alarms.

Claims

1. An automatic drainage device for a conveying pipeline for preparing acetylene by the calcium carbide method, comprising an acetylene conveying pipeline (1), characterized in that: The bottom of the acetylene delivery pipeline (1) is connected to a pipeline water collecting bag (2), and the bottom of the pipeline water collecting bag (2) is connected to a condensate collection tank (4) through a first drainage pipeline (3); a gas phase balance pipe (5) is provided on the top of the condensate collection tank (4) to be connected to the acetylene delivery pipeline (1), a nitrogen delivery pipeline (11) is provided on the top of the condensate collection tank (4) to be connected to the nitrogen main pipe, and a liquid level gauge (7) is also provided on the condensate collection tank (4); the bottom of the condensate collection tank (4) is connected to a second drainage pipeline (6), and a drainage pipe outlet regulating valve (8) is provided on the second drainage pipeline (6); a combustible gas alarm (10) is provided at the drainage pipe outlet regulating valve (8), and the combustible gas alarm (10) and the liquid level gauge (7) are respectively electrically connected to the signal input end of the PLC programmable controller, and the signal output end of the PLC programmable controller is electrically connected to the drainage pipe outlet regulating valve (8).

2. The automatic drainage device for a conveying pipeline for preparing acetylene by the calcium carbide process according to claim 1, characterized in that: The combustible gas alarm (10) is arranged within a radius of 1 m of the outer circle of the drain pipe outlet regulating valve (8).

3. The automatic drainage device for a conveying pipeline for preparing acetylene by the calcium carbide process according to claim 2, characterized in that: The vertical distance between the bottom of the first drainage pipe (3) and the bottom of the condensate collection tank (4) is ≤150 mm.

4. The automatic drainage device for a conveying pipeline for preparing acetylene by the calcium carbide process according to any one of claims 1 to 3, characterized in that: The liquid level meter (7) is a remote liquid level meter.

5. The automatic drainage device for a conveying pipeline for preparing acetylene by the calcium carbide process according to any one of claims 1 to 3, characterized in that: Valves (12) are provided on the first drainage pipe (3), the gas phase balance pipe (5) and the nitrogen delivery pipe (11).

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