Accurate loading and storing device for dichloroethane

Abstract

The utility model discloses an accurate loading and storing device for dichloroethane, belongs to the technical field of chemical production, and solves the problems that the conventional storage, transportation and loading of dichloroethane cannot be standardized, a negative pressure phenomenon easily occurs in a dichloroethane storage tank, and the safety risk is higher. The device comprises a loading regulating valve, a flow meter and a PLC (programmable logic controller), the loading regulating valve and the flow meter are mounted on a loading pipeline, a nitrogen pipeline is mounted on a dichloroethane storage tank, a nitrogen regulating valve is arranged on the nitrogen pipeline, a pressure gauge is further mounted on the dichloroethane storage tank, and the loading regulating valve, the flow meter, the nitrogen regulating valve and the pressure gauge are connected with the PLC. The dichloroethane truck loading device is simple in structure and stable in operation, effectively reduces potential safety hazards during dichloroethane truck loading, and has very high popularization value.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical production, and in particular relates to a precise loading and storage device for ethylene dichloride. Background Art

[0002] In the current production process of vinyl chloride by the calcium carbide method, the main process used is the reaction of calcium carbide with water to produce acetylene, which then undergoes an addition reaction with hydrogen chloride to produce vinyl chloride. In this process, in addition to producing the target product vinyl chloride, a series of side reactions will also occur. The most important of these is the over-chlorination of acetylene to produce dichloroethane and other more complex organic chlorides. The boiling points of these by-products are higher than that of vinyl chloride, so they are separated as high-boiling substances during the distillation process and loaded onto trucks for takeaway or sent to downstream processes for continued production.

[0003] In the current production process, the loading and storage of high-boiling materials have the following problems: the volume of high-boiling materials changes greatly due to the influence of temperature, especially in winter when the temperature is low, the volume of dichloroethane is easy to shrink, which usually causes negative pressure in the dichloroethane storage tank. If the storage tank is not tightly sealed, air is easily sucked into the storage tank, which is easy to cause explosion in the event of static sparks; when loading and transporting high-boiling materials, they need to be loaded and unloaded in strict accordance with the relevant regulations on hazardous chemical vehicles, and there are strict regulations on loading tonnage. Overloading often occurs during the loading process, and re-unloading operations are required in case of overloading. Since dichloroethane is a flammable and explosive hazardous chemical, repeated operations have a high safety risk. Utility Model Content

[0004] The utility model provides a precise loading and storage device for ethylene dichloride, so as to solve the problems that the current storage and transportation loading of ethylene dichloride cannot be standardized, the ethylene dichloride storage tank is prone to negative pressure, and the safety risk is relatively high.

[0005] The technical solution of the utility model is: a precise loading and storage device for dichloroethane, comprising a dichloroethane storage tank and a loading crane pipe, the dichloroethane storage tank and the loading crane pipe being connected through a loading pipeline, a loading pump being installed on the loading pipeline, and further comprising a loading regulating valve, a flow meter and a PLC controller, the loading regulating valve and the flow meter being installed on the loading pipeline, a nitrogen pipeline being installed on the dichloroethane storage tank, a nitrogen regulating valve being provided on the nitrogen pipeline, a pressure gauge being further installed on the dichloroethane storage tank, and the loading regulating valve, the flow meter, the nitrogen regulating valve and the pressure gauge being connected to the PLC controller.

[0006] As a further improvement of the present invention, a reflux pipe is further connected to the loading pipe, the reflux pipe is connected to the dichloroethane storage tank, and a reflux regulating valve is provided on the reflux pipe.

[0007] As a further improvement of the present invention, the reflux regulating valve is connected to a PLC controller.

[0008] The beneficial effects of this utility model include: using a pressure gauge to constantly monitor the pressure of the ethylene dichloride storage tank, and cooperating with a nitrogen regulating valve to maintain a stable pressure within the ethylene dichloride storage tank; using a PLC controller to link the loading regulating valve and flow meter, setting the total loading amount according to the vehicle's conditions, achieving automatic and accurate loading of ethylene dichloride, and effectively preventing overloading of ethylene dichloride during loading. The utility model has a simple structure and stable operation, effectively reducing safety hazards during loading and storage of ethylene dichloride, and has high promotional value. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the structure of the utility model.

[0010] In the figure: 1-dichloroethane storage tank, 2-loading pump, 3-loading pipeline, 4-reflux pipeline, 5-reflux regulating valve, 6-loading regulating valve, 7-flow meter, 8-loading crane pipe, 9-feed pipeline, 10-nitrogen pipeline, 11-nitrogen regulating valve, 12-feed regulating valve, 13-PLC controller, 14-pressure gauge. DETAILED DESCRIPTION

[0011] The present invention will be described in further detail below with reference to the accompanying drawings and specific implementations.

[0012] like Figure 1 As shown, a precise loading and storage device for ethylene dichloride includes a ethylene dichloride storage tank 1 and a loading crane pipe 8. The ethylene dichloride storage tank 1 and the loading crane pipe 8 are connected by a loading pipeline 3, and a loading pump 2 is installed on the loading pipeline 3.

[0013] A precise loading and storage device for ethylene dichloride also includes a loading regulating valve 6, a flow meter 7, and a PLC controller 13. The loading regulating valve 6 and the flow meter 7 are installed on a loading pipeline 3. A nitrogen pipeline 10 is installed on a ethylene dichloride storage tank 1. A nitrogen regulating valve 11 is provided on the nitrogen pipeline 10. A pressure gauge 14 is also installed on the ethylene dichloride storage tank 1. The loading regulating valve 6, the flow meter 7, the nitrogen regulating valve 11, and the pressure gauge 14 are connected to the PLC controller 13.

[0014] The loading pipeline 3 is further connected to a reflux pipeline 4 , which is connected to the dichloroethane storage tank 1 . A reflux regulating valve 5 is provided on the reflux pipeline 4 .

[0015] The reflux regulating valve 5 is connected to the PLC controller 13 .

[0016] During use, the pressure in the dichloroethane storage tank 1 is first detected by the pressure gauge 14. When the pressure is less than 40 kPa, the PLC controller 13 controls the opening of the nitrogen regulating valve 11 to replace the system with nitrogen. After the pressure in the dichloroethane storage tank 1 stabilizes at 40 kPa, the nitrogen regulating valve 11 is closed, and the feed regulating valve 12 is opened to transport the high-boiling products separated by the distillation system to the dichloroethane storage tank 1. The loading capacity of the flow meter 7 is set in the PLC controller 13 according to the required total loading amount. After the setting is completed, the loading pump 2 and the loading regulating valve 6 are opened in sequence. When the loading is about to be completed, the PLC controller 13 controls the loading regulating valve 6 to be gradually closed until the loading regulating valve 6 is completely closed after the loading is completed, and the reflux regulating valve 5 is opened to avoid waste of raw materials. Finally, the on-board liquid level and the preset liquid level of the flow meter 13 are manually checked on site. If adjustment is required, the flow meter is reset. If no adjustment is required, the loading pump 2 and the reflux regulating valve 5 are closed.

Claims

1. A precise loading and storage device for ethylene dichloride, comprising an ethylene dichloride storage tank (1) and a loading crane (8), wherein the ethylene dichloride storage tank (1) and the loading crane (8) are connected via a loading pipe (3), and a loading pump (2) is installed on the loading pipe (3), characterized in that: The system further comprises a loading regulating valve (6), a flow meter (7) and a PLC controller (13), wherein the loading regulating valve (6) and the flow meter (7) are installed on the loading pipeline (3), and the loading pipeline (3) is further installed with a nitrogen pipeline (10) installed on the dichloroethane storage tank (1), a nitrogen regulating valve (11) is provided on the nitrogen pipeline (10), and a pressure gauge (14) is further installed on the dichloroethane storage tank (1), and the loading regulating valve (6), the flow meter (7), the nitrogen regulating valve (11) and the pressure gauge (14) are connected to the PLC controller (13).

2. The precise loading and storage device for ethylene dichloride according to claim 1, characterized in that: The loading pipeline (3) is also connected to a reflux pipeline (4), which is connected to the dichloroethane storage tank (1). A reflux regulating valve (5) is provided on the reflux pipeline (4).

3. The precise loading and storage device for ethylene dichloride according to claim 2, characterized in that: The reflux regulating valve (5) is connected to a PLC controller (13).

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