CN112569740A - Sulfur hexafluoride collecting, purifying and zero-emission equipment in waste gas and working method thereof - Google Patents
Sulfur hexafluoride collecting, purifying and zero-emission equipment in waste gas and working method thereof Download PDFInfo
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Abstract
The equipment for collecting, purifying and zero discharging sulfur hexafluoride in the waste gas comprises an air inlet recovery pipeline, a gas-liquid separation device, a liquid conveying pipeline, a gas adsorption and discharge pipeline and a regeneration pipeline; the gas outlet of the gas inlet recovery pipeline is connected with the gas inlet at the top of the gas-liquid separation device, the liquid outlet at the bottom of the gas-liquid separation device is connected with the liquid inlet of the liquid conveying pipeline, the gas inlet of the gas adsorption discharge pipeline is connected with the gas outlet at the top of the gas-liquid separation device, the gas inlet of the regeneration pipeline is connected on the gas adsorption discharge pipeline, and the gas outlet of the regeneration pipeline is connected at the gas inlet of the gas inlet recovery pipeline. The invention realizes the collection and purification and zero emission treatment of sulfur hexafluoride in the waste gas through four-stage treatment processes of precise filtration, gas-liquid separation, pressure swing adsorption and normal pressure adsorption, the purity of the collected sulfur hexafluoride can reach more than 99.9 percent, and the sulfur hexafluoride gas can be reused after further treatment and the saturated adsorption tower can be recycled.
Description
Technical Field
The invention belongs to the technical field of sulfur hexafluoride gas recovery, and particularly relates to equipment for collecting, purifying and zero-discharging sulfur hexafluoride in waste gas and a working method thereof.
Background
Sulfur hexafluoride is an excellent insulating and arc-extinguishing medium, and is widely applied in the power industry, and with the increasing use amount of sulfur hexafluoride, the speed of sulfur hexafluoride exhausted to the atmosphere is rapidly increased just before. Sulfur hexafluoride gas is a strong greenhouse effect gas, has a global warming potential value which is about 23900 times that of carbon dioxide, and has an accumulative effect on global warming. As one of the main contracting countries of the Kyoto protocol, China is actively promoting and executing the greenhouse gas emission reduction task.
In order to reduce the emission of sulfur hexafluoride greenhouse gas in the power industry, two power grid companies and related enterprises in China develop sulfur hexafluoride gas recovery and recycling work, and sulfur hexafluoride gas recovery, recharging and purification treatment are realized; however, sulfur hexafluoride gas leaked in a closed environment, exhaust gas after sulfur hexafluoride detection, tail gas after sulfur hexafluoride purification and purification, and the like are dead zones in sulfur hexafluoride management.
Therefore, equipment for collecting and purifying sulfur hexafluoride in waste gas, zero emission and a working method thereof are urgently needed in the market, so that the equipment can collect and purify the sulfur hexafluoride in the waste gas under different concentration working conditions, avoid emission and reduce environmental pollution.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides equipment for collecting, purifying and zero-discharging sulfur hexafluoride in waste gas and a working method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme: a device for collecting, purifying and zero discharging sulfur hexafluoride in waste gas comprises an air inlet recovery pipeline, a gas-liquid separation device, a liquid conveying pipeline, a gas adsorption and discharge pipeline and a regeneration pipeline; the gas outlet of the gas inlet recovery pipeline is connected with the gas inlet at the top of the gas-liquid separation device, the liquid outlet at the bottom of the gas-liquid separation device is connected with the liquid inlet of the liquid conveying pipeline, the gas inlet of the gas adsorption discharge pipeline is connected with the gas outlet at the top of the gas-liquid separation device, the gas inlet of the regeneration pipeline is connected on the gas adsorption discharge pipeline, and the gas outlet of the regeneration pipeline is connected at the gas inlet of the gas inlet recovery pipeline.
An air inlet joint, an air inlet pressure gauge, a precision filter, a first recovery solenoid valve, a compressor, a first check valve, a first pressure control switch and a second recovery solenoid valve are sequentially arranged on the air inlet recovery pipeline along the air flow direction.
The air inlet and the air outlet of the first recovery electromagnetic valve are connected with a negative pressure recovery pipe, and the negative pressure recovery electromagnetic valve, the vacuum compressor and the second one-way valve are sequentially arranged on the negative pressure recovery pipe along the airflow direction.
The gas-liquid separation device comprises a refrigerator, a first gas-liquid separation tower and a second gas-liquid separation tower positioned below the first gas-liquid separation tower, and a gas-liquid separation electromagnetic valve is arranged between the bottom of the first gas-liquid separation tower and the top of the second gas-liquid separation tower; the gas outlet of the gas inlet recovery pipeline and the gas inlet of the gas adsorption discharge pipeline are connected to the top of the first gas-liquid separation tower; a liquid inlet of the liquid conveying pipeline is connected with the bottom of the second gas-liquid separation tower;
the lower part of the first gas-liquid separation tower is connected with a first instrument pipe, and a first instrument valve and a separation tower pressure gauge are arranged on the first instrument pipe; a liquid level pipe is arranged between the top and the bottom of the second gas-liquid separation tower, and a liquid level meter is arranged on the liquid level pipe;
the refrigerator is connected with a cooling port of the first gas-liquid separation tower through a first refrigeration connecting pipe and a first refrigeration return pipe, and a first refrigeration electromagnetic valve is arranged on the first refrigeration connecting pipe; the refrigerating machine is connected with a cooling port of the second gas-liquid separation tower through a second refrigerating connecting pipe and a second refrigerating return pipe, and a second refrigerating electromagnetic valve is arranged on the second refrigerating connecting pipe.
And a liquid delivery solenoid valve, a booster, a third one-way valve, a second pressure control switch and a liquid sulfur hexafluoride filling interface are sequentially arranged on the liquid delivery pipeline along the liquid flow direction.
The gas adsorption and discharge pipeline is sequentially provided with a pressure regulating valve, a first exhaust solenoid valve, a first adsorption tower, a flow regulating needle valve, a second exhaust solenoid valve, a second adsorption tower, a sulfur hexafluoride leakage monitoring sensor, a third adsorption tower and an environment-friendly gas discharge port along the gas flow direction, a heating rod is arranged in the first adsorption tower, and the outside of the first adsorption tower is connected with an adsorption tower pressure gauge.
The gas inlet of the regeneration pipeline is connected to a gas adsorption and discharge pipeline between the flow regulating needle valve and the second exhaust electromagnetic valve, and the gas outlet of the regeneration pipeline is connected to the gas inlet of the precision filter of the gas inlet recovery pipeline; a regeneration loop electromagnetic valve and an air cooler are sequentially arranged on the regeneration pipeline along the airflow direction.
A working method of sulfur hexafluoride collecting, purifying and zero-emission equipment in waste gas comprises the following steps,
(1) firstly, opening a gas-liquid separation electromagnetic valve, and communicating a first gas-liquid separation tower with a second gas-liquid separation tower; starting the refrigerator, starting the first refrigeration electromagnetic valve and the second refrigeration electromagnetic valve, refrigerating the first gas-liquid separation tower and the second gas-liquid separation tower, and reducing the temperature in the first gas-liquid separation tower and the second gas-liquid separation tower;
(2) the gas inlet joint is connected with electrical equipment, raw material waste gas in the electrical equipment enters a gas inlet recovery pipeline, impurities such as moisture, decomposition products, dust and the like are filtered by a precision filter, and the raw material waste gas enters the top of a first gas-liquid separation tower after being pressurized by a compressor and then passes through a first one-way valve and a second recovery electromagnetic valve, so that gas-liquid separation is carried out in the first gas-liquid separation tower; when the pressure of the air inlet pressure gauge is lower than 0MPag, closing the first recovery electromagnetic valve, opening the first negative pressure recovery electromagnetic valve and the vacuum compressor, and starting the vacuum compressor to perform negative pressure recovery on waste gas in the electrical equipment so as to reduce the residue of raw material waste gas;
(3) setting the pressure of a pressure gauge of the separation tower not to be higher than 3.5MPag, and when the gas after the pressurization of the compressor is higher than 3.5MPag, sending a signal by a first pressure control switch to cut off the raw material waste gas recovery process, namely closing the compressor and a second recovery electromagnetic valve;
(4) the liquid level meter is a turning plate type liquid level meter, a high limit alarm, a low limit alarm and a medium limit alarm can be set, and when the liquid level of sulfur hexafluoride in the second gas-liquid separation tower is in the medium limit alarm, the waste gas recovery process is stopped, namely the compressor and the second recovery electromagnetic valve are closed; when the liquid level of the sulfur hexafluoride is in a high limit alarm state, the refrigerator and the gas-liquid separation electromagnetic valve are shut down; then starting a liquid sulfur hexafluoride filling process: connecting a liquid sulfur hexafluoride filling port with a steel cylinder or a container, starting a liquid delivery electromagnetic valve, starting a supercharger, and directly filling the liquid sulfur hexafluoride in the second gas-liquid separation tower into an external steel cylinder or container through a liquid delivery pipeline; when the second voltage-controlled switch reaches 3.5MPag alarm signals, the liquid-delivery electromagnetic valve and the booster are automatically managed, the liquid sulfur hexafluoride filling process is stopped, and the filling process is continuously executed after the pressure of a steel bottle or a container is replaced and released;
(5) the waste gas after gas-liquid separation is isolated into a first gas-liquid separation tower by a gas-liquid separation electromagnetic valve, and a pressure regulating valve is regulated to ensure that the gas output pressure in the first gas-liquid separation tower is 0.3-0.4 MPag; opening a first exhaust electromagnetic valve, adsorbing the waste gas by a first adsorption tower, wherein the adsorption pressure is 0.3-0.4 MPag, adjusting the opening of a flow regulating needle valve, controlling the flow rate of the waste gas to be 60L/min, and after the waste gas is subjected to adsorption treatment by the first adsorption tower, the content of sulfur hexafluoride in the waste gas is lower than 200ppm (g/g); then the waste gas enters a second adsorption tower through a second exhaust electromagnetic valve, the adsorption pressure in the second adsorption tower is normal pressure, and the sulfur hexafluoride content in the waste gas is 0 after the waste gas is treated by the second adsorption tower;
(6) the sulfur hexafluoride leakage alarm sensor monitors whether the exhaust gas contains sulfur hexafluoride or not, if yes, an alarm is given, and replacement or offline treatment of the second adsorption tower is prompted; the third adsorption tower is a final measure for ensuring zero emission of sulfur hexafluoride in the waste gas and a standby adsorption tower, and is temporarily used when the second adsorption tower is replaced or offline treated after being saturated in adsorption, and ensures that the content of sulfur hexafluoride in the waste gas emitted from the environment-friendly gas discharge port is 0.
In the step (5), after the first adsorption tower is saturated in adsorption, regeneration is carried out through a regeneration pipeline; the regeneration process comprises the following steps: closing the first exhaust electromagnetic valve and the second exhaust electromagnetic valve, and starting a heating rod to heat the adsorbent in the first adsorption tower at the temperature of 150-200 ℃; then opening the air cooler, the regeneration loop electromagnetic valve, the first recovery electromagnetic valve and the second recovery electromagnetic valve, simultaneously starting the compressor, enabling the regeneration gas in the first adsorption tower to enter the first gas-liquid separation tower through the regeneration pipeline and the gas inlet recovery pipeline, and opening the refrigerator for auxiliary refrigeration in the process of recovering the regeneration gas; and when the pressure of the pressure gauge of the adsorption tower is lower than 0MPag, closing the first recovery electromagnetic valve, opening the negative pressure recovery electromagnetic valve and the vacuum compressor, and performing regeneration treatment on the first adsorption tower in a vacuumizing and heating mode.
By adopting the technical scheme, the invention realizes the collection and purification and zero emission treatment of the sulfur hexafluoride in the waste gas through four-stage treatment processes of precise filtration, gas-liquid separation, pressure swing adsorption and normal pressure adsorption, the purity of the collected sulfur hexafluoride can reach more than 99.9%, the sulfur hexafluoride gas can be recycled after further treatment, and the saturated adsorption tower can also be recycled. The invention solves the problem of processing sulfur hexafluoride waste gas with wide range and different concentrations, improves the reutilization rate of the sulfur hexafluoride gas, reduces the emission of the sulfur hexafluoride gas and has great economic and social benefits.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the present invention, unless otherwise expressly specified or limited, the terms "disposed," "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected or detachably connected; may be a mechanical connection; may be connected directly or indirectly through an intermediary device, or may be connected by electrical lines or signals. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance
Either implicitly or explicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
As shown in fig. 1, the equipment for collecting, purifying and zero discharging sulfur hexafluoride in waste gas of the present invention comprises an inlet gas recovery pipeline 1, a gas-liquid separation device, a liquid delivery pipeline 2, a gas adsorption discharge pipeline 3 and a regeneration pipeline 4; the gas outlet of the gas inlet recovery pipeline 1 is connected with the gas inlet at the top of the gas-liquid separation device, the liquid outlet at the bottom of the gas-liquid separation device is connected with the liquid inlet of the liquid conveying pipeline 2, the gas inlet of the gas adsorption discharge pipeline 3 is connected with the gas outlet at the top of the gas-liquid separation device, the gas inlet of the regeneration pipeline 4 is connected on the gas adsorption discharge pipeline 3, and the gas outlet of the regeneration pipeline 4 is connected at the gas inlet of the gas inlet recovery pipeline 1.
An air inlet joint 5, an air inlet pressure gauge 6, a precision filter 7, a first recovery solenoid valve 8, a compressor 9, a first one-way valve 10, a first pressure control switch 11 and a second recovery solenoid valve 12 are sequentially arranged on the air inlet recovery pipeline 1 along the air flow direction.
The air inlet and the air outlet of the first recovery electromagnetic valve 8 are connected with a negative pressure recovery pipe 13, and a negative pressure recovery electromagnetic valve 14, a vacuum compressor 15 and a second one-way valve 16 are sequentially arranged on the negative pressure recovery pipe 13 along the airflow direction.
The gas-liquid separation device comprises a refrigerator 17, a first gas-liquid separation tower 18 and a second gas-liquid separation tower 19 positioned below the first gas-liquid separation tower 18, and a gas-liquid separation electromagnetic valve 20 is arranged between the bottom of the first gas-liquid separation tower 18 and the top of the second gas-liquid separation tower 19; the gas outlet of the gas inlet recovery pipeline 1 and the gas inlet of the gas adsorption discharge pipeline 3 are both connected to the top of the first gas-liquid separation tower 18; a liquid inlet of the liquid conveying pipeline 2 is connected with the bottom of the second gas-liquid separation tower 19;
the lower part of the first gas-liquid separation tower 18 is connected with a first instrument tube 21, and a first instrument valve 22 and a separation tower pressure gauge 23 are arranged on the first instrument tube 21; a liquid level pipe 24 is arranged between the top and the bottom of the second gas-liquid separation tower 19, and a liquid level meter 25 is arranged on the liquid level pipe 24;
the refrigerator 17 is connected with the cooling port of the first gas-liquid separation tower 18 through a first refrigeration connecting pipe 26 and a first refrigeration return pipe 27, and a first refrigeration electromagnetic valve 28 is arranged on the first refrigeration connecting pipe 26; the refrigerator 17 is connected to the cooling port of the second gas-liquid separation tower 19 through a second refrigeration connecting pipe 29 and a second refrigeration return pipe 30, and a second refrigeration solenoid valve 31 is provided on the second refrigeration connecting pipe 29.
The liquid conveying pipeline 2 is sequentially provided with an infusion electromagnetic valve 32, a booster 33, a third one-way valve 34, a second pressure control switch 35 and a liquid sulfur hexafluoride filling interface 36 along the liquid flow direction.
The gas adsorption and discharge pipeline 3 is sequentially provided with a pressure regulating valve 37, a first exhaust electromagnetic valve 38, a first adsorption tower 39, a flow regulating needle valve 40, a second exhaust electromagnetic valve 41, a second adsorption tower 42, a sulfur hexafluoride leakage monitoring sensor 43, a third adsorption tower 44 and an environment-friendly gas discharge port 45 along the gas flow direction, a heating rod 46 is arranged in the first adsorption tower 39, and an adsorption tower pressure gauge 47 is connected to the outside of the first adsorption tower 39.
The gas inlet of the regeneration pipeline 4 is connected to the gas adsorption and discharge pipeline 3 between the flow regulating needle valve 40 and the second exhaust electromagnetic valve 41, and the gas outlet of the regeneration pipeline 4 is connected to the gas inlet of the precision filter 7 of the gas inlet recovery pipeline 1; a regeneration loop electromagnetic valve 48 and an air cooler 49 are sequentially arranged on the regeneration pipeline 4 along the airflow direction.
A working method of sulfur hexafluoride collecting, purifying and zero-emission equipment in waste gas comprises the following steps,
(1) firstly, opening a gas-liquid separation electromagnetic valve 20, and communicating a first gas-liquid separation tower 18 with a second gas-liquid separation tower 19; starting the refrigerator 17, opening the first refrigeration electromagnetic valve 28 and the second refrigeration electromagnetic valve 31, refrigerating the first gas-liquid separation tower 18 and the second gas-liquid separation tower 19, and reducing the temperature in the first gas-liquid separation tower 18 and the second gas-liquid separation tower 19;
(2) the air inlet joint 5 is connected with electrical equipment, raw material waste gas in the electrical equipment enters an air inlet recovery pipeline 1, impurities such as moisture, decomposition products and dust are filtered by a precision filter 7, a first recovery electromagnetic valve 8 is pressurized by a compressor 9 and then enters the top of a first gas-liquid separation tower 18 through a first one-way valve 10 and a second recovery electromagnetic valve 12, and gas-liquid separation is carried out in the first gas-liquid separation tower 18; when the pressure of the air inlet pressure gauge 6 is lower than 0MPag, closing the first recovery electromagnetic valve 8, opening the first negative pressure recovery electromagnetic valve 14 and the vacuum compressor 15, and starting the vacuum compressor 15 to perform negative pressure recovery on waste gas in the electrical equipment so as to reduce the residue of raw material waste gas;
(3) setting the pressure of a pressure gauge 23 of the separation tower not to be higher than 3.5MPag, and when the gas is higher than 3.5MPag after the pressure of a compressor 9 is increased, sending a signal by a first pressure control switch 11 to cut off the raw material waste gas recovery process, namely closing the compressor 9 and a second recovery electromagnetic valve 12;
(4) the liquid level meter 25 is a flap type liquid level meter, can set high and low limit alarm, and when the liquid level of the sulfur hexafluoride in the second gas-liquid separation tower 19 is in the middle limit alarm, the waste gas recovery process is stopped, namely the compressor 9 and the second recovery electromagnetic valve 12 are closed; when the sulfur hexafluoride liquid level is in the high limit alarm, the refrigerator 17 and the gas-liquid separation electromagnetic valve 20 are shut down; then starting a liquid sulfur hexafluoride filling process: connecting a filling port of the liquid sulfur hexafluoride with a steel bottle or a container, starting a liquid delivery electromagnetic valve 32, starting a supercharger 33, and directly filling the liquid sulfur hexafluoride in the second gas-liquid separation tower 19 into an external steel bottle or container through a liquid delivery pipeline 2; when the second pressure control switch 35 reaches the 3.5MPag alarm signal, the liquid delivery solenoid valve 32 and the booster 33 are automatically managed, the liquid sulfur hexafluoride filling process is stopped, and the filling process is continuously executed after the pressure of the steel cylinder or the container is replaced;
(5) the waste gas after gas-liquid separation is isolated into a first gas-liquid separation tower 18 by a gas-liquid separation electromagnetic valve 20, and a pressure regulating valve 37 is regulated to ensure that the gas output pressure in the first gas-liquid separation tower 18 is 0.3-0.4 MPag; opening a first exhaust electromagnetic valve 38, adsorbing the waste gas by a first adsorption tower 39, wherein the adsorption pressure is 0.3-0.4 MPag, adjusting the opening degree of a flow regulating needle valve 40, controlling the flow rate of the waste gas to be 60L/min, and after the waste gas is subjected to adsorption treatment by the first adsorption tower 39, the content of sulfur hexafluoride in the waste gas is lower than 200ppm (g/g); then the waste gas enters a second adsorption tower 42 through a second exhaust electromagnetic valve 41, the adsorption pressure in the second adsorption tower 42 is normal pressure, and the content of sulfur hexafluoride in the waste gas is 0 after the waste gas is treated by the second adsorption tower 42;
(6) the sulfur hexafluoride leakage alarm sensor monitors whether the exhaust gas contains sulfur hexafluoride or not, if yes, an alarm is given, and replacement or offline treatment of the second adsorption tower 42 is prompted; the third adsorption tower 44 is a final measure and a standby adsorption tower for ensuring zero emission of sulfur hexafluoride in the exhaust gas, and when the second adsorption tower 42 is replaced after being saturated in adsorption or is offline treated, the third adsorption tower 44 is temporarily used and ensures that the content of sulfur hexafluoride in the exhaust gas discharged from the environmental-friendly gas discharge port 45 is 0.
In the step (5), after the first adsorption tower 39 is saturated by adsorption, regeneration is carried out through the regeneration pipeline 4; the regeneration process comprises the following steps: closing the first exhaust electromagnetic valve 38 and the second exhaust electromagnetic valve 41, and starting the heating rod 46 to heat the adsorbent in the first adsorption tower 39, wherein the heating temperature is 150-200 ℃; then the air cooler 49, the regeneration loop electromagnetic valve 48, the first recovery electromagnetic valve 8 and the second recovery electromagnetic valve 12 are started, the compressor 9 is started at the same time, the regeneration gas in the first adsorption tower 39 enters the first gas-liquid separation tower 18 through the regeneration pipeline 4 and the inlet gas recovery pipeline 1, and the refrigerator 17 is started for auxiliary refrigeration in the process of recovering the regeneration gas; when the pressure of the adsorption tower pressure gauge 47 is lower than 0MPag, the first recovery electromagnetic valve 8 is closed, the negative pressure recovery electromagnetic valve 14 and the vacuum compressor 15 are opened, and the first adsorption tower 39 is subjected to regeneration treatment in a vacuumizing and heating mode.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. Sulfur hexafluoride in the waste gas is collected purification, zero release equipment, its characterized in that: comprises an air inlet recovery pipeline, a gas-liquid separation device, a liquid conveying pipeline, a gas adsorption and discharge pipeline and a regeneration pipeline; the gas outlet of the gas inlet recovery pipeline is connected with the gas inlet at the top of the gas-liquid separation device, the liquid outlet at the bottom of the gas-liquid separation device is connected with the liquid inlet of the liquid conveying pipeline, the gas inlet of the gas adsorption discharge pipeline is connected with the gas outlet at the top of the gas-liquid separation device, the gas inlet of the regeneration pipeline is connected on the gas adsorption discharge pipeline, and the gas outlet of the regeneration pipeline is connected at the gas inlet of the gas inlet recovery pipeline.
2. The apparatus for the collection, purification and zero emission of sulfur hexafluoride in exhaust gas as claimed in claim 1, wherein: an air inlet joint, an air inlet pressure gauge, a precision filter, a first recovery solenoid valve, a compressor, a first check valve, a first pressure control switch and a second recovery solenoid valve are sequentially arranged on the air inlet recovery pipeline along the air flow direction.
3. The apparatus for the collection, purification and zero emission of sulfur hexafluoride in exhaust gas as claimed in claim 2, wherein: the air inlet and the air outlet of the first recovery electromagnetic valve are connected with a negative pressure recovery pipe, and the negative pressure recovery electromagnetic valve, the vacuum compressor and the second one-way valve are sequentially arranged on the negative pressure recovery pipe along the airflow direction.
4. The apparatus for the collection, purification and zero emission of sulfur hexafluoride in exhaust gas as claimed in claim 2, wherein: the gas-liquid separation device comprises a refrigerator, a first gas-liquid separation tower and a second gas-liquid separation tower positioned below the first gas-liquid separation tower, and a gas-liquid separation electromagnetic valve is arranged between the bottom of the first gas-liquid separation tower and the top of the second gas-liquid separation tower; the gas outlet of the gas inlet recovery pipeline and the gas inlet of the gas adsorption discharge pipeline are connected to the top of the first gas-liquid separation tower; a liquid inlet of the liquid conveying pipeline is connected with the bottom of the second gas-liquid separation tower;
the lower part of the first gas-liquid separation tower is connected with a first instrument pipe, and a first instrument valve and a separation tower pressure gauge are arranged on the first instrument pipe; a liquid level pipe is arranged between the top and the bottom of the second gas-liquid separation tower, and a liquid level meter is arranged on the liquid level pipe;
the refrigerator is connected with a cooling port of the first gas-liquid separation tower through a first refrigeration connecting pipe and a first refrigeration return pipe, and a first refrigeration electromagnetic valve is arranged on the first refrigeration connecting pipe; the refrigerating machine is connected with a cooling port of the second gas-liquid separation tower through a second refrigerating connecting pipe and a second refrigerating return pipe, and a second refrigerating electromagnetic valve is arranged on the second refrigerating connecting pipe.
5. The apparatus for the collection, purification and zero emission of sulfur hexafluoride in exhaust gas as claimed in claim 4, wherein: and a liquid delivery solenoid valve, a booster, a third one-way valve, a second pressure control switch and a liquid sulfur hexafluoride filling interface are sequentially arranged on the liquid delivery pipeline along the liquid flow direction.
6. The apparatus for the collection, purification and zero emission of sulfur hexafluoride in exhaust gas as claimed in claim 4, wherein: the gas adsorption and discharge pipeline is sequentially provided with a pressure regulating valve, a first exhaust solenoid valve, a first adsorption tower, a flow regulating needle valve, a second exhaust solenoid valve, a second adsorption tower, a sulfur hexafluoride leakage monitoring sensor, a third adsorption tower and an environment-friendly gas discharge port along the gas flow direction, a heating rod is arranged in the first adsorption tower, and the outside of the first adsorption tower is connected with an adsorption tower pressure gauge.
7. The apparatus for the collection, purification and zero emission of sulfur hexafluoride in exhaust gas of claim 6, wherein: the gas inlet of the regeneration pipeline is connected to a gas adsorption and discharge pipeline between the flow regulating needle valve and the second exhaust electromagnetic valve, and the gas outlet of the regeneration pipeline is connected to the gas inlet of the precision filter of the gas inlet recovery pipeline; a regeneration loop electromagnetic valve and an air cooler are sequentially arranged on the regeneration pipeline along the airflow direction.
8. The operating method of equipment for collecting, purifying and zero-emission of sulfur hexafluoride in exhaust gas as claimed in claim 7, wherein the equipment comprises: comprises the following steps of (a) carrying out,
(1) firstly, opening a gas-liquid separation electromagnetic valve, and communicating a first gas-liquid separation tower with a second gas-liquid separation tower; starting the refrigerator, starting the first refrigeration electromagnetic valve and the second refrigeration electromagnetic valve, refrigerating the first gas-liquid separation tower and the second gas-liquid separation tower, and reducing the temperature in the first gas-liquid separation tower and the second gas-liquid separation tower;
(2) the gas inlet joint is connected with electrical equipment, raw material waste gas in the electrical equipment enters a gas inlet recovery pipeline, impurities such as moisture, decomposition products, dust and the like are filtered by a precision filter, and the raw material waste gas enters the top of a first gas-liquid separation tower after being pressurized by a compressor and then passes through a first one-way valve and a second recovery electromagnetic valve, so that gas-liquid separation is carried out in the first gas-liquid separation tower; when the pressure of the air inlet pressure gauge is lower than 0MPag, closing the first recovery electromagnetic valve, opening the first negative pressure recovery electromagnetic valve and the vacuum compressor, and starting the vacuum compressor to perform negative pressure recovery on waste gas in the electrical equipment so as to reduce the residue of raw material waste gas;
(3) setting the pressure of a pressure gauge of the separation tower not to be higher than 3.5MPag, and when the gas after the pressurization of the compressor is higher than 3.5MPag, sending a signal by a first pressure control switch to cut off the raw material waste gas recovery process, namely closing the compressor and a second recovery electromagnetic valve;
(4) the liquid level meter is a turning plate type liquid level meter, a high limit alarm, a low limit alarm and a medium limit alarm can be set, and when the liquid level of sulfur hexafluoride in the second gas-liquid separation tower is in the medium limit alarm, the waste gas recovery process is stopped, namely the compressor and the second recovery electromagnetic valve are closed; when the liquid level of the sulfur hexafluoride is in a high limit alarm state, the refrigerator and the gas-liquid separation electromagnetic valve are shut down; then starting a liquid sulfur hexafluoride filling process: connecting a liquid sulfur hexafluoride filling port with a steel cylinder or a container, starting a liquid delivery electromagnetic valve, starting a supercharger, and directly filling the liquid sulfur hexafluoride in the second gas-liquid separation tower into an external steel cylinder or container through a liquid delivery pipeline; when the second voltage-controlled switch reaches 3.5MPag alarm signals, the liquid-delivery electromagnetic valve and the booster are automatically managed, the liquid sulfur hexafluoride filling process is stopped, and the filling process is continuously executed after the pressure of a steel bottle or a container is replaced and released;
(5) the waste gas after gas-liquid separation is isolated into a first gas-liquid separation tower by a gas-liquid separation electromagnetic valve, and a pressure regulating valve is regulated to ensure that the gas output pressure in the first gas-liquid separation tower is 0.3-0.4 MPag; opening a first exhaust electromagnetic valve, adsorbing the waste gas by a first adsorption tower, wherein the adsorption pressure is 0.3-0.4 MPag, adjusting the opening of a flow regulating needle valve, controlling the flow rate of the waste gas to be 60L/min, and after the waste gas is subjected to adsorption treatment by the first adsorption tower, the content of sulfur hexafluoride in the waste gas is lower than 200ppm (g/g); then the waste gas enters a second adsorption tower through a second exhaust electromagnetic valve, the adsorption pressure in the second adsorption tower is normal pressure, and the sulfur hexafluoride content in the waste gas is 0 after the waste gas is treated by the second adsorption tower;
(6) the sulfur hexafluoride leakage alarm sensor monitors whether the exhaust gas contains sulfur hexafluoride or not, if yes, an alarm is given, and replacement or offline treatment of the second adsorption tower is prompted; the third adsorption tower is a final measure for ensuring zero emission of sulfur hexafluoride in the waste gas and a standby adsorption tower, and is temporarily used when the second adsorption tower is replaced or offline treated after being saturated in adsorption, and ensures that the content of sulfur hexafluoride in the waste gas emitted from the environment-friendly gas discharge port is 0.
9. The operating method of equipment for collecting, purifying and zero-emission of sulfur hexafluoride in exhaust gas as claimed in claim 8, wherein the equipment comprises: in the step (5), after the first adsorption tower is saturated in adsorption, regeneration is carried out through a regeneration pipeline; the regeneration process comprises the following steps: closing the first exhaust electromagnetic valve and the second exhaust electromagnetic valve, and starting a heating rod to heat the adsorbent in the first adsorption tower at the temperature of 150-200 ℃; then opening the air cooler, the regeneration loop electromagnetic valve, the first recovery electromagnetic valve and the second recovery electromagnetic valve, simultaneously starting the compressor, enabling the regeneration gas in the first adsorption tower to enter the first gas-liquid separation tower through the regeneration pipeline and the gas inlet recovery pipeline, and opening the refrigerator for auxiliary refrigeration in the process of recovering the regeneration gas; and when the pressure of the pressure gauge of the adsorption tower is lower than 0MPag, closing the first recovery electromagnetic valve, opening the negative pressure recovery electromagnetic valve and the vacuum compressor, and performing regeneration treatment on the first adsorption tower in a vacuumizing and heating mode.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113398713A (en) * | 2021-08-04 | 2021-09-17 | 国网河北省电力有限公司电力科学研究院 | On-line purification system for sulfur hexafluoride gas of on-transport equipment |
| CN114620691A (en) * | 2022-04-21 | 2022-06-14 | 重庆渝能滤油机制造有限公司 | Sulfur hexafluoride purification device and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113398713A (en) * | 2021-08-04 | 2021-09-17 | 国网河北省电力有限公司电力科学研究院 | On-line purification system for sulfur hexafluoride gas of on-transport equipment |
| CN114620691A (en) * | 2022-04-21 | 2022-06-14 | 重庆渝能滤油机制造有限公司 | Sulfur hexafluoride purification device and method |
| CN114620691B (en) * | 2022-04-21 | 2023-12-29 | 重庆渝能滤油机制造有限公司 | Sulfur hexafluoride purifying device and method |
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