Waste gas treatment system of DMF (Dimethyl Formamide) rectification system

Abstract

The utility model discloses a waste gas treatment system of a DMF (Dimethyl Formamide) rectification system, which comprises a primary gas-liquid separator, a secondary gas-liquid separator, a liquid collecting tank and a spraying device, a gas inlet of the primary gas-liquid separator is connected with a gas outlet of the DMF rectification system, a gas outlet of the primary gas-liquid separator is connected with a gas inlet of the secondary gas-liquid separator through a first pipeline, and a gas outlet of the secondary gas-liquid separator is connected with a gas outlet of the liquid collecting tank through a second pipeline. The spraying device is mounted on the first pipeline; a liquid outlet of the first-stage gas-liquid separator and a liquid outlet of the second-stage gas-liquid separator are connected with a liquid inlet of the liquid collecting tank through second pipelines respectively, and an exhaust port of the second-stage gas-liquid separator and a liquid outlet of the liquid collecting tank are connected with the boiler through third pipelines respectively. Compared with the prior art, the spraying device is used for absorbing gas which is not completely separated by the first-stage gas-liquid separator, and then the gas is further separated by the second-stage gas-liquid separator, so that tail gas generated by gas incineration reaches the emission standard.

Description

Technical Field

[0001] The utility model relates to a waste gas treatment system, in particular to a waste gas treatment system of a DMF distillation system. Background Art

[0002] The DMF distillation system is a system for recovering, purifying and reusing low-concentration DMF generated in industrial production. Waste gas is generated during distillation using the DMF distillation system. The waste gas is discharged using a treatment device. The current treatment device includes a gas-liquid separator. The waste gas passes through the gas-liquid separator to discharge gas and waste liquid. The gas enters the boiler for incineration and then is discharged. However, in actual use, it is found that the gas enters the boiler and is incinerated to generate tail gas, and the VOC in the tail gas is prone to approaching the critical value of emission or exceeding the standard.

[0003] Based on this, the applicant conducted in-depth research on this basis, which led to the emergence of this case. Utility Model Content

[0004] The utility model aims to provide a waste gas treatment system of a DMF distillation system, which can reduce the emission of VOC in tail gas and achieve the purpose of normal emission.

[0005] To achieve the above purpose, the solution of the utility model is:

[0006] A waste gas treatment system for a DMF distillation system comprises a primary gas-liquid separator, a secondary gas-liquid separator, a liquid collecting tank and a spray device, wherein the air inlet of the primary gas-liquid separator is connected to the air outlet of the DMF distillation system, the upper ends of the primary gas-liquid separator and the secondary gas-liquid separator are respectively provided with exhaust ports, the bottoms of the primary gas-liquid separator and the secondary gas-liquid separator are respectively provided with liquid outlets, the exhaust port of the primary gas-liquid separator is connected to the air inlet of the secondary gas-liquid separator through a first pipeline, the liquid outlet of the primary gas-liquid separator and the liquid outlet of the secondary gas-liquid separator are respectively connected to the liquid inlet of the liquid collecting tank through a second pipeline, and the exhaust port of the secondary gas-liquid separator and the liquid outlet of the liquid collecting tank are respectively connected to a boiler through a third pipeline; wherein the spray device is installed on the first pipeline.

[0007] The spray device comprises a spray head component, on which a plurality of rotary atomizing nozzles are mounted, each of the rotary atomizing nozzles is rotatably mounted on the spray head component, and each of the rotary atomizing nozzles is located in the first pipe.

[0008] The nozzle member is connected to a water tank for storing process water through a delivery pipeline.

[0009] The liquid collection tank is a dimethylamine collection tank.

[0010] It also includes a controller. Solenoid valves are respectively installed at the water inlet of the delivery pipeline, the first pipeline, the second pipeline and the third pipeline. The control end of each solenoid valve is electrically connected to the signal output end of the controller.

[0011] After adopting the above structure, the utility model has the following beneficial effects: the utility model adopts a newly added spraying device, after the waste gas is separated into the primary treatment gas and the primary treatment liquid by the primary gas-liquid separator, the primary treatment gas is sprayed by the spraying device to absorb the organic matter dissolved in water in the primary treatment gas, and then enters the secondary gas-liquid separator, and then the secondary gas-liquid separator separates the gas and the liquid, the gas separated from the organic matter enters the boiler for incineration, the tail gas generated by the waste gas is discharged, and the liquid dissolved in the organic matter enters the liquid collection tank, and the liquid in the liquid collection tank enters the boiler for incineration after the DMF distillation system is shut down, and then discharged; in this way, the spraying device is used to separate the gas that is not completely separated by the primary gas-liquid separator, and then further separated by the secondary gas-liquid separator, so that the tail gas generated by the gas incineration meets the emission standards, and the emission of VOC is reduced, so as to achieve the purpose of normal emission. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a principle block diagram of the utility model.

[0013] In the figure:

[0014] 1-DMF distillation system; 2-primary gas-liquid separator; 3-liquid collecting tank; 4-secondary gas-liquid separator; 51-first pipeline; 52-second pipeline; 53-third pipeline; 54-fourth pipeline; 6-nozzle component. DETAILED DESCRIPTION

[0015] In order to further explain the technical solution of the present utility model, the present utility model is described in detail below through specific embodiments.

[0016] The utility model discloses a waste gas treatment system for a DMF distillation system, such as Figure 1 As shown, it is used to treat the exhaust gas of the DMF distillation system 1. The DMF distillation system 1 is a conventional system in the art, so it will not be described in detail.

[0017] The waste gas treatment system of the utility model comprises a primary gas-liquid separator 2 and a liquid collecting tank 3. The improvement of the utility model is that the waste gas treatment system further comprises a secondary gas-liquid separator 4 and a spray device.

[0018] Specifically, the primary gas-liquid separator 2 and the secondary gas-liquid separator 4 both adopt separators conventionally used in the industry, and both are used to separate gas and liquid; wherein, the primary gas-liquid separator 2 and the secondary gas-liquid separator 4 are respectively provided with an air inlet, a liquid outlet and an exhaust port, the two air inlets are respectively located on the side walls of the primary gas-liquid separator 2 and the secondary gas-liquid separator 4, the two liquid outlets are respectively located at the bottom of the primary gas-liquid separator 2 and the secondary gas-liquid separator 4, and the two exhaust ports are respectively located at the upper ends of the primary gas-liquid separator 2 and the secondary gas-liquid separator 4; in this way, after gas-liquid separation, the liquid flows out from the bottom of the gas-liquid separator, and the gas is discharged from the upper side of the gas-liquid separator.

[0019] The connection structure of each device is as follows: the air outlet of the above-mentioned DMF distillation system 1 is connected to the air inlet of the primary gas-liquid separator 2, the exhaust port of the primary gas-liquid separator 2 is connected to the air inlet of the secondary gas-liquid separator 4 through the first pipeline 51, the liquid outlets of the primary gas-liquid separator 2 and the secondary gas-liquid separator 4 are respectively connected to the liquid inlet of the liquid collecting tank 3 through the second pipeline 52, and the exhaust port of the secondary gas-liquid separator 4 and the liquid outlet of the liquid collecting tank 3 are respectively connected to the boiler through the third pipeline 53; wherein, the above-mentioned spray device is installed on the first pipeline 51.

[0020] Furthermore, the above-mentioned spray device adopts a rotatable spray head that is already sold on the market. In this embodiment, the spray device adopts the following structure, the spray device includes a spray head component 6, which is rotatably installed in the first pipe 51, and the rotation structure of the spray head component 6 is an existing conventional structure, so it is not described in detail; and, a plurality of rotary atomizing nozzles are installed on the spray head component 6, and each rotary atomizing nozzle is rotatably installed on the spray head component 6 in a conventional manner. In this embodiment, 8 rotary atomizing nozzles are used as an example for explanation, and each rotary atomizing nozzle is evenly spaced and arranged in sequence, and each rotary atomizing nozzle is located inside the first pipe 51, so that the first pipe 51 is sprayed by each rotary atomizing nozzle, so as to achieve all-round mist spraying during spraying; wherein, the water inlet of the spray head component 6 is connected to the water pool through the water supply pipe 54, and the water pool is a water pool for storing process water.

[0021] As a preferred embodiment, the nozzle component 6 is located in the first pipe 51, and the nozzle component 6 is sealed and arranged on the first pipe 51 in a conventional manner to prevent the gas from floating out of the first pipe 51; in addition, the nozzle component 6 is opened or disconnected by conventional technical means. For example, a solenoid valve is arranged at the water inlet of the water supply pipe 54. This embodiment also includes a controller, and the control end of the solenoid valve is respectively connected to the signal output end of the controller to realize the on and off through the controller, so as to realize automatic control of the spraying amount.

[0022] Furthermore, the liquid collecting tank 3 is a conventional dimethylamine collecting tank, and the liquid collecting tank 3 is provided with a pipeline pump for liquid quantitative measurement.

[0023] The working principle of the waste gas treatment system of the DMF distillation system of the utility model is as follows: the waste gas generated by the DMF distillation system enters the primary gas-liquid separator, and after gas-liquid separation, the waste gas is separated into the primary treatment gas and the primary treatment liquid, and the primary treatment gas enters the secondary gas-liquid separator 4 from the first pipeline 51. When the primary treatment gas is in the first pipeline 51, process water enters each rotary atomizing nozzle, so that each rotary atomizing nozzle sprays water to the primary treatment gas, so that the organic matter dissolved in water in the primary treatment gas is dissolved in the process water, and further treatment is achieved, and the gas and the liquid containing the organic matter are transported together to In the secondary gas-liquid separator 4, the secondary gas-liquid separator 4 performs secondary gas-liquid separation, and the organic matter in the treated gas is reduced, that is, the amount of gas discharged to the boiler for incineration is reduced. The gas is discharged into the boiler for incineration, and then discharged after incineration, so that the tail gas can meet the emission standard; at the same time, the liquid separated in the secondary gas-liquid separator 4 enters the liquid collection tank 3, and is quantitatively pumped into the boiler for incineration through the liquid on the liquid collection tank 3 by a pipeline pump, and the amount of liquid sent is based on not exceeding the boiler exhaust gas emission standard, and the excess liquid is stored in the liquid collection tank 3. After the DMF distillation system is shut down, it will continue to be pumped into the boiler for combustion. Best, the DMF distillation system in this embodiment has an operating time of 15 days / month and a boiler operating time of 30 days / month, so that there is enough time to burn the stored dimethylamine collected liquid; wherein, the above-mentioned restrictions are adjusted according to the specific actual situation and are not limited to the above-mentioned restrictions.

[0024] Furthermore, in this embodiment, the above-mentioned primary gas-liquid separator 2, secondary gas-liquid separator 4, liquid collection tank 3 and spray device are respectively conventional devices in the industry, which will not be described in detail here.

[0025] As a preferred method, the gas outlet of the above-mentioned DMF distillation system 1 is connected to the gas inlet of the primary gas-liquid separator 2 through the fourth pipeline 54, and the above-mentioned first pipeline 51, second pipeline 52 and third pipeline 53 are respectively installed with solenoid valves, and the control end of each solenoid valve is respectively connected to the signal output end of the above-mentioned controller to realize the opening and closing of each pipeline and control the entire system of this embodiment.

[0026] It should be noted that the above-mentioned controller adopts an existing conventional PLC controller, such as an Omron series controller.

[0027] The above is only a preferred embodiment of the present invention, and all equivalent changes and modifications made within the scope of the claims of the present utility model shall fall within the scope of the claims of the present utility model.

Claims

1. A waste gas treatment system for a DMF distillation system, characterized in that: It comprises a primary gas-liquid separator, a secondary gas-liquid separator, a liquid collecting tank and a spray device, wherein the air inlet of the primary gas-liquid separator is connected to the air outlet of the DMF distillation system, the upper ends of the primary gas-liquid separator and the secondary gas-liquid separator are respectively provided with exhaust ports, the bottoms of the primary gas-liquid separator and the secondary gas-liquid separator are respectively provided with liquid outlets, the exhaust port of the primary gas-liquid separator is connected to the air inlet of the secondary gas-liquid separator through a first pipeline, the liquid outlet of the primary gas-liquid separator and the liquid outlet of the secondary gas-liquid separator are respectively connected to the liquid inlet of the liquid collecting tank through a second pipeline, and the exhaust port of the secondary gas-liquid separator and the liquid outlet of the liquid collecting tank are respectively connected to the boiler through a third pipeline; wherein the spray device is installed on the first pipeline.

2. The waste gas treatment system of a DMF distillation system according to claim 1, characterized in that: The spray device comprises a spray head component, on which a plurality of rotary atomizing nozzles are mounted, each of which is rotatably mounted on the spray head component, and each of which is located in the first pipeline.

3. The waste gas treatment system of a DMF distillation system according to claim 2, characterized in that: The nozzle member is connected to a water tank for storing process water through a delivery pipeline.

4. The waste gas treatment system of a DMF distillation system according to claim 1, characterized in that: The liquid collection tank is a dimethylamine collection tank.

5. The waste gas treatment system of a DMF distillation system according to claim 3, characterized in that: It also includes a controller. Solenoid valves are respectively installed at the water inlet of the delivery pipeline, the first pipeline, the second pipeline and the third pipeline. The control end of each solenoid valve is electrically connected to the signal output end of the controller.

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