Recycling system for discharged materials of PTMEG loading filter

Abstract

The utility model discloses a PTMEG loading filter discharged material recovery system which comprises a loading filter, a liquid storage tank and a pneumatic diaphragm pump. A bottom liquid outlet of the loading filter is communicated with a liquid inlet of the liquid storage tank through a pipeline, a liquid outlet of the liquid storage tank is communicated with a liquid inlet of the pneumatic diaphragm pump through a pipeline, and a liquid outlet of the pneumatic diaphragm pump is communicated with an inlet of the circulation workshop section through a pipeline; heat tracing devices are arranged on the liquid storage tank and the communicating pipeline; the device has the advantages that the waste liquid discharged when the filter element of the loading filter is replaced is recovered and then conveyed into the environmental engineering section for depolymerization, so that the resource recovery is realized, the material waste caused by direct incineration is avoided, the economic benefit of an enterprise is improved, and the energy consumption in the PTMEG generation process is reduced; carbon emission of enterprises can be reduced, and the national double-carbon strategy is met; meanwhile, by arranging the heat tracing device, blockage can be avoided, and the labor intensity and the safety risk of workers are reduced.

Description

Technical Field

[0001] The utility model relates to the field of waste liquid recovery, in particular to a discharge material recovery system for a PTMEG loading filter. Background Art

[0002] The qualified molecular weight materials produced by the PTMEG device are first sent to the batch tanks in the finished product tank area for storage. When they need to be shipped out, the materials in the batch tanks are sent to the mixing tank to be mixed with sulfuric acid and BHT to be qualified and then sent to the loading platform. After being filtered by the loading filter, they are loaded. Since the loading filter of PTMEG is prone to blockage, it is necessary to regularly replace the filter element of the loading filter. When replacing the filter element, the materials in the loading filter need to be first discharged from the bottom drain valve through a hose into a bucket, and then sent to the waste liquid tank for incineration treatment through the waste liquid collection system. However, since PTMEG is extremely easy to solidify in a low-temperature environment, and the current liquid discharge method is relatively simple and rough without corresponding heat tracing devices, it is very easy to often cause pipeline blockage in winter. Personnel need to climb high to deal with the aerial pipe gallery, which has potential safety risks and high labor intensity for employees; at the same time, sending PTMEG for incineration will cause material waste; in addition, when incinerating PTMEG, it will increase the carbon emissions of the factory, which is not conducive to environmental protection. Summary of the Utility Model

[0003] In order to solve the above problems, the purpose of the utility model is to provide a discharge material recovery system for a PTMEG loading filter.

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

[0005] A discharge material recovery system for a PTMEG loading filter includes a loading filter, a liquid storage tank, and a pneumatic diaphragm pump;

[0006] The bottom drain port of the loading filter is communicated with the liquid inlet of the liquid storage tank through a pipeline, the liquid outlet of the liquid storage tank is communicated with the liquid inlet of the pneumatic diaphragm pump through a pipeline, and the liquid outlet of the pneumatic diaphragm pump is communicated with the inlet of the recycling section through a pipeline;

[0007] Heat tracing devices are provided on the liquid storage tank, the PTMEG transitional material storage tank, and the connecting pipelines;

[0008] One outlet of the nitrogen pipeline is communicated with the nitrogen inlet of the liquid storage tank through a pipeline, and a pressure reducing valve and a check valve are respectively provided at the nitrogen inlet; the other outlet of the nitrogen pipeline is communicated with the air inlet of the pneumatic diaphragm pump through a pipeline, and a diaphragm pump air supply valve is provided at the air inlet;

[0009] An inlet valve is provided at the inlet of the loading filter, a loading valve is provided at the loading port of the loading filter, and a drain valve is provided at the drain port of the loading filter;

[0010] An inlet pressure sensor is provided at the inlet of the loading filter, and an outlet pressure sensor is provided at the outlet of the loading filter. The signal output ends of the inlet pressure sensor and the outlet pressure sensor are both signal-connected to the signal input end of the controller. The signal output end of the controller is respectively signal-connected to the signal input ends of the inlet valve, the drain valve, the air supply valve of the diaphragm pump, and the loading valve.

[0011] Furthermore, it also includes a PTMEG transitional material storage tank and a transitional material transfer pump;

[0012] The liquid outlet of the PTMEG device is communicated with the liquid inlet of the PTMEG transitional material storage tank through an unqualified material discharge pipeline. The liquid outlet of the PTMEG transitional material storage tank is communicated with the inlet of the transitional material transfer pump through a pipeline. The outlet of the transitional material transfer pump is communicated with the inlet of the ring chemical section through a pipeline;

[0013] An unqualified material discharge valve is provided on the unqualified material discharge pipeline.

[0014] Furthermore, the liquid outlet of the pneumatic diaphragm pump is communicated with the liquid inlet of the PTMEG transitional material storage tank through a pipeline. A ring chemical inlet valve is provided at the inlet of the ring chemical section, and a transfer pump outlet valve is provided at the outlet of the transitional material transfer pump.

[0015] Furthermore, the heat tracing device is a steam heat tracing jacket.

[0016] Furthermore, the nitrogen pipeline is also communicated with the filter drain port at the top of the loading filter through a pipeline. A filter drain valve is provided at the filter drain port; the signal input end of the filter drain valve is signal-connected to the signal output end of the controller.

[0017] Furthermore, a tank internal pressure sensor is provided in the liquid storage tank. The signal output end of the tank internal pressure sensor is signal-connected to the signal input end of the controller.

[0018] Furthermore, a diaphragm pump outlet pressure sensor is provided at the liquid outlet of the pneumatic diaphragm pump. The signal output end of the diaphragm pump outlet pressure sensor is signal-connected to the signal input end of the controller.

[0019] Further, a pressure sensor for the transitional material storage tank is provided inside the PTMEG transitional material storage tank. The signal output end of the pressure sensor for the transitional material storage tank is in signal connection with the signal input end of the controller. The signal output end of the controller is respectively in signal connection with the signal input ends of the cyclization inlet valve and the outlet valve of the transfer pump.

[0020] Advantages of the present utility model:

[0021] By recycling the waste liquid discharged when replacing the filter element of the loading filter and then transporting it to the cyclization section for depolymerization, the recovery of resources is realized, the waste of materials caused by direct incineration is avoided, the economic benefits of the enterprise are improved, and the energy consumption in the process of producing PTMEG is reduced; at the same time, the carbon emissions of the enterprise can be reduced, which conforms to the national "dual carbon" strategy; moreover, by setting up a heat tracing device, blockage can be avoided, and the labor intensity and safety risk of workers are reduced. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of the system connection for this embodiment;

[0024] Figure 2 It is a schematic diagram of the control principle for this embodiment.

[0025] In the figure: loading filter 1, liquid storage tank 2, pneumatic diaphragm pump 3, reflux valve 4, nitrogen pipeline 5, PTMEG transitional material storage tank 6, transitional material transfer pump 7, pressure reducing valve 8, check valve 9, diaphragm pump air supply valve 10, inlet valve 11, loading valve 12, drain valve 13, inlet pressure sensor 14, outlet pressure sensor 15, controller 16, unqualified material discharge valve 17, cyclization inlet valve 18, outlet valve of transfer pump 19, filter drain valve 20, pressure sensor inside the tank 21, diaphragm pump outlet pressure sensor 22, pressure sensor for transitional material storage tank 23, diaphragm pump inlet valve 24, diaphragm pump outlet valve 25, cyclization section 26. Detailed Embodiments

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0027] Embodiment 1:

[0028] As Figure 1 、 Figure 2 shown, a PTMEG loading filter discharge material recovery system includes a loading filter 1, a liquid storage tank 2, and a pneumatic diaphragm pump 3; it also includes a PTMEG transitional material storage tank 6 and a transitional material transfer pump 7;

[0029] The bottom drain port of the loading filter 1 is connected to the liquid inlet of the liquid storage tank 2 through a pipeline, the liquid outlet of the liquid storage tank 2 is connected to the liquid inlet of the pneumatic diaphragm pump 3 through a pipeline, and the liquid outlet of the pneumatic diaphragm pump 3 is connected to the inlet of the ring chemical section 26 through a pipeline; the liquid outlet of the PTMEG device is connected to the liquid inlet of the PTMEG transitional material storage tank 6 through an unqualified material discharge pipeline, the liquid outlet of the PTMEG transitional material storage tank 6 is connected to the inlet of the transitional material transfer pump 7 through a pipeline, and the outlet of the transitional material transfer pump 7 is connected to the inlet of the ring chemical section 26 through a pipeline; the liquid outlet of the pneumatic diaphragm pump 3 is connected to the liquid inlet of the PTMEG transitional material storage tank 6 through a pipeline. A ring chemical inlet valve 18 is provided at the inlet of the ring chemical section 26, and a transfer pump outlet valve 19 is provided at the outlet of the transitional material transfer pump 7. Heat tracing devices are provided on the liquid storage tank 2, the PTMEG transitional material storage tank 6, and the connecting pipelines; in this embodiment, the heat tracing device is a steam heat tracing jacket.

[0030] One outlet of the nitrogen pipeline 4 is connected to the nitrogen inlet of the liquid storage tank 2 through a pipeline, and a pressure reducing valve 8 and a check valve 9 are respectively provided at the nitrogen inlet; the other outlet of the nitrogen pipeline 5 is connected to the air inlet of the pneumatic diaphragm pump 3 through a pipeline, and a diaphragm pump air supply valve 10 is provided at the air inlet; the nitrogen pipeline 5 is also connected to the filter drain port at the top of the loading filter 1 through a pipeline, and a filter drain valve 20 is provided at the filter drain port;

[0031] An inlet valve 11 is provided at the inlet of the loading filter 1, a loading valve 12 is provided at the loading port of the loading filter 1, a drain valve 13 is provided at the drain port of the loading filter 1, a diaphragm pump inlet valve 24 and a diaphragm pump outlet valve 25 are respectively provided at the inlet and outlet of the pneumatic diaphragm pump 3; an unqualified material discharge valve 17 is provided on the unqualified material discharge pipeline.

[0032] An inlet pressure sensor 14 is provided at the inlet of the loading filter 1, an outlet pressure sensor 15 is provided at the outlet of the loading filter 1, a pressure sensor 21 inside the liquid storage tank 2 is provided inside the liquid storage tank 2, a diaphragm pump outlet pressure sensor 22 is provided at the liquid outlet of the pneumatic diaphragm pump 3, a transition material storage tank pressure sensor 23 is provided inside the PTMEG transition material storage tank 6, and a reflux valve 4 is provided on the pipeline connecting the pneumatic diaphragm pump 3 and the PTMEG transition material storage tank 6;

[0033] The signal output ends of the inlet pressure sensor 14, the outlet pressure sensor 15, the pressure sensor 21 inside the tank, the diaphragm pump outlet pressure sensor 22, and the transition material storage tank pressure sensor 23 are all signal-connected to the signal input end of the controller 16. The signal output end of the controller 16 is respectively signal-connected to the signal input ends of the inlet valve 11, the drain valve 13, the diaphragm pump air supply valve 10, the diaphragm pump inlet valve 24, the diaphragm pump outlet valve 25, the loading valve 12, the filter drain valve 20, the cyclization inlet valve 18, the reflux valve 4, and the delivery pump outlet valve 19.

[0034] Working description:

[0035] When using this embodiment, the inlet pressure sensor 14 and the outlet pressure sensor 15 are used to monitor the inlet and outlet pressures of the loading filter 1. When the difference between the two exceeds the preset pressure difference value, it is determined that the loading filter 1 is blocked and needs to be stopped to replace the filter element. At this time, the controller 16 controls the inlet valve 11 and the loading valve 12 to be in the closed state, and the drain valve 13 is opened to discharge the PTMEG waste liquid in the loading filter 1 into the liquid storage tank 2; during the process of discharging the PTMEG waste liquid in the loading filter 1 into the liquid storage tank 2, in order to make the drainage smoother, the filter drain valve 20 is opened, nitrogen is filled into the loading filter 1, and the PTMEG waste liquid is pressed into the liquid storage tank 2 through pressure.

[0036] When the pressure sensor 21 in the tank detects that the pressure in the liquid storage tank 2 reaches the preset high pressure value, the filter drain valve 20 and the drain valve 13 are closed in sequence; the outlet valve 19 of the transfer pump is closed, the inlet valve 24 of the diaphragm pump, the outlet valve 25 of the diaphragm pump and the air supply valve 10 of the diaphragm pump are opened, and according to the pressure in the PTMEG transitional material storage tank 6 and the operation of the cyclization section 26, the opening and closing conditions of the reflux valve 4 and the cyclization inlet valve 18 are determined. When the pressure in the PTMEG transitional material storage tank 6 exceeds the preset pressure value, the cyclization inlet valve 18 is opened, and the pneumatic diaphragm pump 3 is used to transport the material in the liquid storage tank 2 to the cyclization section 26; when an abnormal situation occurs in the cyclization section 26 and the waste liquid cannot be received, the reflux valve 4 is opened, and the pneumatic diaphragm pump 3 is used to recycle the material in the liquid storage tank 2 to the PTMEG transitional material storage tank 6 for temporary storage. When the outlet pressure sensor 15 detects that the outlet pressure of the pneumatic diaphragm pump 3 drops to the preset low pressure value, it indicates that the material in the liquid storage tank 2 has been transported completely, and the air supply valve 10 of the diaphragm pump, the inlet valve 24 of the diaphragm pump, the outlet valve 25 of the diaphragm pump and the reflux valve 4 are closed in sequence. If the pressure in the PTMEG transitional material storage tank 6 reaches the preset starting pressure value at this time, the transitional material transfer pump 7 and the outlet valve 19 of the transfer pump are opened, and the material in the PTMEG transitional material storage tank 6 can be transported to the cyclization section 26 for depolymerization.

[0037] Meanwhile, the unqualified materials generated during the production process and the transitional materials generated during production conversion are also sent to the PTMEG transitional material storage tank 6 and finally sent back to the cyclization section 26 for recovery.

[0038] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A PTMEG loading filter discharge material recovery system, characterized in that: Includes loading filter, reservoir and air-operated diaphragm pump; The bottom drain port of the loading filter is connected to the liquid inlet of the liquid storage tank through a pipeline, the liquid outlet of the liquid storage tank is connected to the liquid inlet of the pneumatic diaphragm pump through a pipeline, and the liquid outlet of the pneumatic diaphragm pump is connected to the inlet of the cyclization section through a pipeline; The liquid storage tank and the connecting pipeline are both provided with a heating device; One outlet of the nitrogen pipeline is connected to the nitrogen inlet of the liquid storage tank through a pipeline, and a pressure reducing valve and a check valve are respectively provided at the nitrogen inlet; the other outlet of the nitrogen pipeline is connected to the air inlet of the pneumatic diaphragm pump through a pipeline, and a diaphragm pump air supply valve is provided at the air inlet; An inlet valve is provided at the inlet of the vehicle loading filter, a loading valve is provided at the loading port of the vehicle loading filter, a drain valve is provided at the drain port of the vehicle loading filter, and a diaphragm pump inlet valve and a diaphragm pump outlet valve are provided at the inlet and outlet of the pneumatic diaphragm pump respectively; An inlet pressure sensor is provided at the inlet of the loading filter, and an outlet pressure sensor is provided at the outlet of the loading filter. The signal output ends of the inlet pressure sensor and the outlet pressure sensor are both signal-connected to the signal input end of the controller, and the signal output end of the controller is signal-connected to the inlet valve, the drain valve, the diaphragm pump air supply valve, the diaphragm pump inlet valve, the diaphragm pump outlet valve and the signal input end of the loading valve.

2. A PTMEG vehicle filter exhaust material recovery system according to claim 1, characterized in that: It also includes a PTMEG transition material storage tank and a transition material delivery pump; The liquid outlet of the PTMEG device is connected to the liquid inlet of the PTMEG transition material storage tank through a defective material discharge pipeline, the liquid outlet of the PTMEG transition material storage tank is connected to the inlet of the transition material delivery pump through a pipeline, and the outlet of the transition material delivery pump is connected to the inlet of the cyclization chemical section through a pipeline; An unqualified material discharge valve is provided on the unqualified material discharge pipeline, and a heating device is provided on the PTMEG transition material storage tank and the connecting pipeline.

3. A PTMEG vehicle filter exhaust material recovery system according to claim 2, characterized in that: The liquid outlet of the pneumatic diaphragm pump is connected to the liquid inlet of the PTMEG transition material storage tank through a pipeline. A cyclization inlet valve is provided at the inlet of the cyclization section, and a delivery pump outlet valve is provided at the outlet of the transition material delivery pump.

4. A PTMEG vehicle filter exhaust material recovery system according to claim 2, characterized in that: The heating device is a steam heating jacket.

5. A PTMEG vehicle filter exhaust material recovery system according to claim 1, characterized in that: The nitrogen pipeline is also connected to the filter drain port at the top of the loading filter through a pipeline, and a filter drain valve is provided at the filter drain port; the signal input end of the filter drain valve is signal-connected to the signal output end of the controller.

6. A PTMEG vehicle filter exhaust material recovery system according to claim 1, characterized in that: An in-tank pressure sensor is provided in the liquid storage tank, and a signal output end of the in-tank pressure sensor is signal-connected to a signal input end of the controller.

7. A PTMEG vehicle filter exhaust material recovery system according to claim 1, characterized in that: A diaphragm pump outlet pressure sensor is provided at the liquid outlet of the pneumatic diaphragm pump, and a signal output end of the diaphragm pump outlet pressure sensor is signal-connected to a signal input end of the controller.

8. A PTMEG vehicle filter exhaust material recovery system according to claim 3, characterized in that: A transition material storage tank pressure sensor is provided in the PTMEG transition material storage tank, and a reflux valve is provided on the pipeline connecting the pneumatic diaphragm pump and the PTMEG transition material storage tank; The signal output end of the transition material storage tank pressure sensor is signal-connected to the signal input end of the controller, and the signal output end of the controller is signal-connected to the signal input ends of the cyclization inlet valve, the reflux valve and the delivery pump outlet valve respectively.

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