Airtight discharge system

Abstract

The utility model belongs to the technical field of environmental protection, and particularly relates to a closed discharging system. The utility model provides a closed discharge system which is applied to a silicon-manganese tail gas desulfurization facility and comprises a gas-water separator, a first liquid level detection piece and a flow regulating valve. Wherein the gas-water separator is communicated with a guide shower of at least one deoiling and debenzolization tank of the desulfurization facility, and is configured to perform gas-liquid separation on discharge and respectively output the discharge to the gas pipeline and the liquid pipeline; the first liquid level detection piece is configured to detect the liquid level of liquid in the gas-water separator; and the flow regulating valve is arranged on the liquid pipeline, is in communication connection with the first liquid level detection part and is configured to regulate the flow of the liquid pipeline according to a liquid level signal of the first liquid level detection part in a preset liquid level range. The closed discharge system disclosed by the utility model solves the problem that the discharge enters a subsequent working section due to the fact that the oil and benzene removal tank is not discharged for a long time, avoids the leakage of entrained process gas caused by direct discharge, and reduces the labor intensity of operators.

Description

Technical Field

[0001] This disclosure belongs to the field of environmental protection technology, and specifically relates to a closed-loop emission system. Background Technology

[0002] To enhance the utilization value of ferrosilicon tail gas and reduce CO2 emissions, an increasing number of enterprises are leveraging its high CO content to produce high-value-added chemicals. Currently, there are already processes in China for producing methanol from ferrosilicon tail gas. Ferrosilicon tail gas contains numerous impurities, including tar, water, particulate matter, and sulfur. Before desulfurization, deoiling and benzene removal are typically performed to remove large molecules such as tar, benzene, and naphthalene from the tail gas.

[0003] The existing desulfurization facilities have oil and benzene removal tanks with drainage systems at the bottom. Waste is discharged by manual on-site operation of the switch at irregular intervals. However, if the drainage system is not turned on for a long time, the discharge may enter the downstream system processes and cause adverse effects, especially on the downstream desulfurization catalyst and precious metal deoxidizer. At the same time, the discharge may carry a small amount of process gas, causing pollution. Utility Model Content

[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and to disclose a closed-loop emission system.

[0005] This disclosure provides a closed-loop emission system for use in a ferrosilicon tail gas desulfurization facility, the system comprising:

[0006] A gas-liquid separator is connected to the drain of at least one deoiling and benzene removal tank of the desulfurization facility and is configured to separate the effluent into gas and liquid and output them to gas pipeline and liquid pipeline respectively.

[0007] A first liquid level detection element is configured to detect the liquid level inside the gas-liquid separator.

[0008] A flow regulating valve is disposed on the liquid pipeline and is communicatively connected to the first liquid level detection element. It is configured to adjust the flow rate of the liquid pipeline within a preset liquid level range according to the liquid level signal of the first liquid level detection element.

[0009] In one embodiment of this disclosure, the system further includes:

[0010] A second liquid level detection element is configured to detect the liquid level inside the gas-liquid separator;

[0011] An emergency shut-off valve is disposed on the liquid pipeline upstream of the flow regulating valve and is communicatively connected to the second liquid level detection element. The valve is configured to close when the second liquid level detection element detects a low liquid level signal.

[0012] In one embodiment of this disclosure, the system further includes:

[0013] A first maintenance valve is disposed on a liquid pipeline upstream of the flow regulating valve and is configured to connect or disconnect the liquid pipeline.

[0014] A second maintenance valve is disposed on the liquid line downstream of the flow regulating valve and is configured to connect or disconnect the liquid line.

[0015] A third maintenance valve is located upstream of the first liquid level detection element and is configured to connect or disconnect the first liquid level detection element.

[0016] A fourth maintenance valve is located upstream of the second liquid level detection element and is configured to connect or disconnect the second liquid level detection element.

[0017] The first maintenance valve, the second maintenance valve, the third maintenance valve, and the fourth maintenance valve are normally open.

[0018] In one embodiment of this disclosure, the system further includes a secondary liquid pipeline, one end of which is connected to a liquid pipeline upstream of the first maintenance valve, and the other end of which is connected to a liquid pipeline downstream of the second maintenance valve, and the secondary liquid pipeline is provided with a normally closed secondary outlet valve.

[0019] In one embodiment of this disclosure, the first liquid level detection element and the second liquid level detection element are liquid level gauges.

[0020] In one embodiment of this disclosure, the top of the gas-liquid separator is provided with at least one communication port, which is connected to the drain of the oil and benzene removal tank.

[0021] In one embodiment of this disclosure, the gas-water separator is provided with a first inlet valve at the connection port.

[0022] In one embodiment of this disclosure, the bottom of the gas-liquid separator is provided with a liquid phase outlet, which is connected to the liquid pipeline;

[0023] The gas-water separator is provided with a gas phase outlet at the top, which is connected to the gas pipeline.

[0024] In one embodiment of this disclosure, the gas-water separator is provided with a gas outlet valve at the gas phase outlet.

[0025] In one embodiment of this disclosure, the gas separated by gas-liquid separation is transported to the fuel gas pipeline network through the gas pipeline;

[0026] The liquid from the gas-liquid separation is transported to the underground tank of the raw material gas compressor through the liquid pipeline.

[0027] One of the beneficial effects of this disclosure is that the closed-loop emission system of this disclosure is applied to the desulfurization facility for silicon-manganese tail gas. By installing a gas-liquid separator in the deoiling and benzene-removing tank of the desulfurization facility, the exhaust gas and liquid are separated and output to the gas pipeline and liquid pipeline respectively. At the same time, a first liquid level detection device is also provided to detect the liquid level in the gas-liquid separator. The flow regulating valve on the liquid pipeline adjusts the flow rate of the liquid pipeline within a preset liquid level range based on the liquid level signal detected by the first liquid level detection device.

[0028] Thus, the closed-loop discharge system disclosed herein achieves the airtightness of on-site drainage, which can solve the problem of effluent entering subsequent processes caused by prolonged non-discharge of the deoiling and benzene removal tanks. It effectively controls the liquid level and discharge of effluent in the gas-liquid separator, reduces the impact on the lifespan of subsequent desulfurizing agents and precious metal deoxidizers in the desulfurization facility, and avoids alarms caused by process gas entrainment during direct discharge of the deoiling and benzene removal tanks. It also eliminates safety hazards and environmental risks during on-site sewage discharge and reduces the labor intensity of on-site operators. Attached Figure Description

[0029] Embodiments of this disclosure are illustrated in conjunction with the accompanying drawings, which are included and form part of this specification, and together with their description serve to explain the principles of this disclosure.

[0030] Figure 1 This is a schematic diagram of the structure of a closed-loop discharge system according to an embodiment of the present disclosure.

[0031] Figure 1 The correspondence between the component names and the reference numerals in the figures is as follows:

[0032] 1. Gas-liquid separator; 11. First liquid level detection element; 12. Second liquid level detection element; 13. Third maintenance valve; 14. Fourth maintenance valve;

[0033] 21 First inlet valve, 22 Second inlet valve;

[0034] 3. Gas pipeline; 31. Gas outlet valve;

[0035] 4 Liquid pipeline, 41 Flow regulating valve, 42 Emergency shut-off valve, 43 First maintenance valve, 44 Second maintenance valve;

[0036] 5 auxiliary liquid pipelines, 51 auxiliary line outlet valves;

[0037] Oil and benzene removal tank A, oil and benzene removal tank B. Detailed Implementation

[0038] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.

[0039] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0040] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0041] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0043] In this article, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.

[0044] In this article, "first," "second," etc., are used only to distinguish one another, and not to indicate degree of importance, order, or prerequisite for each other.

[0045] In this document, terms such as “equal” and “same” are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use.

[0046] In the process of preparing methanol products from ferrosilicon tail gas, the treatment of tail gas is crucial. Ferrosilicon tail gas contains many impurities, including tar, water, dust particles, and sulfur. Before desulfurization, deoiling and benzene removal are usually used to remove large molecules such as tar, benzene, and naphthalene from the tail gas.

[0047] The existing desulfurization facilities have oil and benzene removal tanks with drainage systems at the bottom. Waste is discharged by manual operation of the switch on-site at irregular intervals. However, if the drainage system is not turned on for a long time, the discharge may enter the downstream system processes and cause adverse effects, especially on the downstream desulfurization catalyst and precious metal deoxidizer. At the same time, the discharge may carry a small amount of process gas, causing pollution.

[0048] To address this, this disclosure provides a closed-loop emission system for use in a ferrosilicon tail gas desulfurization facility. The system includes a gas-liquid separator, a first liquid level detection element, and a flow regulating valve. The gas-liquid separator is connected to the drain of at least one deoiling and benzene-removing tank in the desulfurization facility and is configured to separate the effluent into gas and liquid components, respectively outputting them to a gas pipeline and a liquid pipeline. The first liquid level detection element is configured to detect the liquid level within the gas-liquid separator. The flow regulating valve is located on the liquid pipeline and is communicatively connected to the first liquid level detection element, configured to adjust the flow rate of the liquid pipeline within a preset liquid level range based on the liquid level signal from the first liquid level detection element.

[0049] This disclosure involves installing a gas-liquid separator in the desulfurization facility's deoiling and benzene-removing tank to separate the effluent into gas and liquid components, which are then output to gas and liquid pipelines respectively. Furthermore, a first liquid level detector is installed to monitor the liquid level within the gas-liquid separator. When the detected liquid level rises, the flow regulating valve on the liquid pipeline increases its opening based on the liquid level signal detected by the first liquid level detector, thereby increasing the flow rate in the liquid pipeline. Conversely, when the detected liquid level falls, the flow regulating valve on the liquid pipeline decreases its opening based on the liquid level signal detected by the first liquid level detector, thereby decreasing the flow rate in the liquid pipeline.

[0050] Thus, the closed-loop discharge system disclosed herein, by setting a first liquid level detection element and a flow regulating valve, can control the flow rate of the liquid separated by the gas-liquid separator in the liquid pipeline according to the liquid level in the gas-liquid separator, while the gas separated by the gas-liquid separator enters the gas pipeline.

[0051] This disclosed closed-loop discharge system achieves the airtightness of on-site drainage, which can solve the problem of effluent entering subsequent processes caused by the long-term non-discharge of the deoiling and benzene removal tank. It effectively controls the liquid level and discharge of effluent in the gas-liquid separator, and reduces the impact on the lifespan of subsequent desulfurizing agents and precious metal deoxidizers in the desulfurization facility.

[0052] Meanwhile, this closed-loop discharge system avoids alarms caused by process gas entrainment during direct discharge from the deoiling and benzene removal tanks, eliminates safety hazards and environmental risks during on-site sewage discharge, and reduces the labor intensity of on-site operators.

[0053] For ease of understanding, please refer to the following: Figure 1 The specific structure and principle of the closed-loop emission system provided in this disclosure will be described in detail with reference to the embodiments.

[0054] In one embodiment, this disclosure provides a closed-loop emission system for a ferrosilicon tail gas desulfurization facility, comprising a gas-liquid separator 1, a first liquid level detection element 11, and a flow regulating valve 41. The gas-liquid separator 1 is connected to the drain of at least one deoiling and benzene-removing tank of the desulfurization facility and is configured to separate the effluent into gas and liquid components, which are then output to a gas pipeline 3 and a liquid pipeline 4, respectively. The first liquid level detection element 11 is configured to detect the liquid level within the gas-liquid separator 1. The flow regulating valve 41 is located on the liquid pipeline 4 and is communicatively connected to the first liquid level detection element 11, and is configured to adjust the flow rate of the liquid pipeline 4 within a preset liquid level range based on the liquid level signal from the first liquid level detection element 11.

[0055] Specifically, in the process of producing methanol from ferrosilicon tail gas, the ferrosilicon furnace tail gas from the gas holder is pressurized after gas-water separation and electrostatic precipitator, and after high-efficiency oil removal, it is sent to the fine desulfurization unit to remove total sulfur and oxygen. Then it enters the isothermal sulfur-free conversion unit to adjust the CO / H2 ratio. The converted gas enters the PSA decarbonization unit to remove most of the CO2, and then is compressed by the synthesis gas compressor and sent to the methanol synthesis section to synthesize crude methanol.

[0056] The fine desulfurization unit first adopts an oil and benzene removal tank, which removes large molecules such as tar, benzene, and naphthalene from the gas through physical adsorption or condensation. The oil and benzene removal tank may generate a mixture containing water vapor, gas, or liquid droplets.

[0057] Optionally, multiple oil and benzene removal tanks can be connected in parallel (e.g., two or more) to disperse the airflow, reduce the load on a single tank, and ensure treatment efficiency. If the gas volume increases, the number of parallel tanks can be increased. For cases with extremely high impurity concentrations, a small number of tanks can be connected in series (e.g., two tanks in series) before being connected in parallel to improve the purification depth. This disclosure does not impose any limitations. See [link to other documentation] Figure 1 In one embodiment of this disclosure, an oil and benzene removal tank A and an oil and benzene removal tank B are provided to increase the process gas oil and benzene removal efficiency in the silicon-manganese tail gas desulfurization facility.

[0058] Furthermore, the drains at the bottom of the deoiling and benzene-removing tanks A and B are directed to the gas-liquid separator 1 for gas-liquid separation. The discharged material is separated into gas and liquid, which are then transported to the gas pipeline 3 and the liquid pipeline 4, respectively. At the same time, a first liquid level detection element 11 and a flow regulating valve 41 are installed. By detecting the liquid level in the gas-liquid separator 1, the flow rate of the liquid pipeline 4 is adjusted.

[0059] In this system, the operator pre-adjusts the liquid level range detected by the first liquid level detector 11, which is determined based on the capacity of the gas-liquid separator. The first liquid level detector 11 monitors the liquid level in the gas-liquid separator in real time and transmits the liquid level signal to the flow regulating valve 41. Then, based on the received liquid level signal, the flow regulating valve 41 increases the valve opening when the liquid level rises, thereby increasing the flow rate in the liquid pipeline 4; and decreases the valve opening when the liquid level falls, thereby decreasing the flow rate in the liquid pipeline 4. This prevents the liquid level in the gas-liquid separator 1 from being too high, causing liquid to be carried downstream by the gas flow into downstream equipment (such as compressors or pipelines), leading to equipment damage or malfunction; or prevents the liquid level from being too low, causing liquid entrained in the gas to be insufficiently captured and directly enter the gas pipeline 3, causing corrosion or blockage. Therefore, by precisely controlling the flow rate through the first liquid level detector 11 and the flow regulating valve 41, the stability of this system can be ensured, and the energy efficiency and safety of the closed-loop discharge system can be improved.

[0060] In summary, if the effluent from the deoiling and benzene-removing tank (i.e., the separated tar, benzene compounds, and a small amount of water) is not properly treated, it may significantly affect the use of catalysts in downstream units (such as desulfurization units, deoxygenation units, and methanol synthesis units). Therefore, this disclosure addresses this issue by connecting a closed discharge system to the drain of the deoiling and benzene-removing tank, thereby preventing the effluent from entering the subsequent processes of the ferrosilicon tail gas desulfurization facility due to untimely manual discharge.

[0061] Meanwhile, the closed-loop discharge system disclosed in this paper avoids alarms caused by the direct discharge of process gas from the deoiling and benzene removal tanks, eliminates safety hazards and environmental risks when discharging sewage on-site, and reduces the labor intensity of on-site operators.

[0062] See Figure 1 In one embodiment, the system of this disclosure further includes a second liquid level detection element 12 and an emergency shut-off valve 42, wherein the second liquid level detection element 12 is configured to detect the liquid level in the gas-liquid separator 1; the emergency shut-off valve 42 is disposed on the liquid pipeline 4 upstream of the flow regulating valve 41 and is communicatively connected to the second liquid level detection element 12, and is configured to close the valve when the second liquid level detection element 12 detects a low liquid level signal.

[0063] In detail, the gas-liquid separator 1 of this disclosure is also equipped with a second liquid level detection element 12 to detect low liquid level in the gas-liquid separator 1. When the second liquid level detection element 12 detects a low liquid level, it may indicate that the gas-liquid separator 1 has failed to effectively capture liquid, causing gas to carry liquid into the gas pipeline 3. Timely warning is required. The operator has preset a low liquid level value. When the second liquid level detection element 12 detects a low liquid level, it sends a liquid level signal to the emergency shut-off valve 42. The emergency shut-off valve 42 then immediately closes the valve to avoid adverse effects on the system. Alternatively, if the operator finds that the liquid level in the gas-liquid separator 1 is too low or there are other emergency situations, the operator can manually close the emergency shut-off valve 42 to prevent the accident from escalating or to ensure the safety of personnel and equipment.

[0064] See Figure 1 In one embodiment, the system of this disclosure further includes a first maintenance valve 43, a second maintenance valve 44, a third maintenance valve, and a fourth maintenance valve. The first maintenance valve 43 is disposed on the liquid line 4 upstream of the flow regulating valve 41 and is configured to connect or disconnect the liquid line 4. The second maintenance valve 44 is disposed on the liquid line 4 downstream of the flow regulating valve 41 and is configured to connect or disconnect the liquid line 4. The third maintenance valve 13 is disposed upstream of the first liquid level detection element 11 and is configured to connect or disconnect the first liquid level detection element 11. The fourth maintenance valve 14 is disposed upstream of the second liquid level detection element 12 and is configured to connect or disconnect the second liquid level detection element 12. The first maintenance valve 43, the second maintenance valve 44, the third maintenance valve 13, and the fourth maintenance valve 14 are normally open.

[0065] Specifically, a normally open first maintenance valve 43 and a second maintenance valve 44 are respectively installed on the liquid pipelines 4 upstream and downstream of the flow regulating valve 41 to achieve safe isolation, facilitate maintenance, and troubleshooting. The first maintenance valve 43 and the second maintenance valve 44 are manually operated valves.

[0066] When the flow control valve 41 leaks, becomes blocked, or requires maintenance, the upstream and downstream first maintenance valve 43 and second maintenance valve 44 can be closed to isolate the faulty section from the system, preventing the impact on other equipment or the spread of hazardous media. After isolation, the liquid in the local pipe section can be drained, facilitating maintenance and reducing the risk of leakage. Furthermore, when the control valve is closed, the second maintenance valve 44 can prevent downstream liquid backflow from impacting the flow control valve 41. In addition, if the flow control valve 41 fails (e.g., cannot be closed, leaks), the first maintenance valve 43 and the second maintenance valve 44 can serve as emergency backup shut-off points to prevent continuous liquid leakage.

[0067] Furthermore, the first liquid level detection element 11 and the second liquid level detection element 12 are respectively provided with a normally open third maintenance valve 13 and a fourth maintenance valve 14 on the detection ports connected to the gas-liquid separator 1. The third maintenance valve 13 and the fourth maintenance valve 14 are manually operated valves.

[0068] When the first liquid level detection element 11 and / or the second liquid level detection element 12 need to be cleaned, calibrated or repaired, closing the corresponding third maintenance valve 13 and fourth maintenance valve 14 can disconnect the corresponding liquid level detection element from the gas-liquid separator 1, prevent liquid leakage or backflow, and ensure operational safety.

[0069] See Figure 1 In one embodiment, the system disclosed herein further includes a secondary liquid line 5, one end of which is connected to a liquid line 4 upstream of the first maintenance valve 43, and the other end of which is connected to a liquid line 4 downstream of the second maintenance valve 44. The secondary liquid line 5 is provided with a normally closed secondary outlet valve 51.

[0070] Specifically, this disclosure also includes a secondary liquid pipeline 5, on which a normally closed secondary outlet valve 51 is provided. The secondary liquid pipeline 5 of this disclosure is connected in parallel with the first maintenance valve 43, the flow regulating valve 41, and the second maintenance valve 44.

[0071] Thus, when the flow regulating valve 41 malfunctions and requires maintenance or cleaning, the entire system does not need to be shut down. Only the first maintenance valve 43 and the second maintenance valve 44 upstream and downstream of the flow regulating valve 41 need to be closed for safe disassembly. Simultaneously, by opening the bypass outlet valve 51, the liquid flow in this system can be maintained. The normally closed bypass outlet valve 51 ensures that the bypass liquid line 5 is closed during normal operation, preventing uncontrolled liquid leakage or interference with the flow in the liquid line 4. Furthermore, the bypass outlet valve 51 requires manual opening by the operator to prevent abnormal bypass opening due to valve malfunction or accidental activation.

[0072] Alternatively, in emergency situations (such as accidental discharge, tank cleaning, or tank transfer), the secondary liquid line 5 can also serve as a channel for rapid discharge or transfer of liquid, thereby increasing the efficiency of discharge.

[0073] See Figure 1 In one embodiment of this disclosure, the first liquid level detection element 11 and the second liquid level detection element 12 are liquid level gauges.

[0074] Thus, the first liquid level detection element 11 and the second liquid level detection element 12 of this disclosure are respectively the first liquid level gauge and the second liquid level gauge, which can monitor the changes in liquid level in the gas-liquid separator in real time. The first liquid level gauge detects the liquid level in the gas-liquid separator 1 and automatically adjusts the opening of the flow regulating valve 41 according to the increase or decrease of the liquid level, thereby adjusting the flow rate of the liquid pipeline 4; when the second liquid level gauge detects that the liquid level in the gas-liquid separator 1 is too low, it automatically controls the emergency shut-off valve 42 to close the valve.

[0075] In this invention, the first and second level gauges are positioned at different locations on the outer wall of the gas-liquid separator 1 to avoid mutual interference, and are connected to the gas-liquid separator 1 via detection ports. A third maintenance valve 13 is installed upstream of the first level gauge, and a fourth maintenance valve 14 is installed upstream of the second level gauge. This allows the third and fourth maintenance valves 13 and 14 to be closed and the two level gauges to be inspected in the event of system shutdown or emergency.

[0076] See Figure 1 In one embodiment of this disclosure, the top of the gas-water separator 1 is provided with at least one communication port, which is connected to the drain of the oil and benzene removal tank.

[0077] Specifically, the drain in the oil and benzene removal tank is a key component in chemical equipment used to discharge residual liquid, impurities, or empty the equipment. During shutdown and maintenance, the drain is used to completely empty the liquid in the oil and benzene removal tank, facilitating cleaning or replacement of internal components. The top of the gas-liquid separator 1 is provided with at least one connection port, thereby connecting to the drain corresponding to at least one oil and benzene removal tank to achieve closed discharge of the effluent from the oil and benzene removal tank. Furthermore, the connection port at the top of the gas-liquid separator 1 can prevent gas backflow or pressure buildup due to pressure fluctuations, ensuring that the internal liquid can only accumulate at the bottom and be discharged to the liquid pipeline 4, preventing liquid backflow to upstream equipment, and preventing gas from carrying liquid into the gas pipeline 3.

[0078] See Figure 1 In one embodiment of this disclosure, the gas-water separator 1 is provided with a first inlet valve 21 at the connection port.

[0079] Thus, the first inlet valve 21 of this disclosure can regulate the fluid pressure entering the connection port, preventing equipment damage or system instability caused by excessively high or low pressure. In addition, the first inlet valve 21 is a one-way valve, which can prevent the fluid from flowing backward and protect the safety of the equipment and system. Furthermore, when the system of this disclosure is shut down or under maintenance, closing the first inlet valve 21 can isolate the connection port from the upstream equipment to prevent leakage or accidental flow of the discharge.

[0080] Furthermore, in one embodiment of this disclosure, the drains of the deoiling and benzene-removing tank A and the deoiling and benzene-removing tank B are respectively connected to the gas-water separator 1 through different connecting ports. At the same time, a first inlet valve 21 is provided at the connecting port between the deoiling and benzene-removing tank A and the gas-water separator 1, and a second inlet valve 22 is provided at the connecting port between the deoiling and benzene-removing tank B and the gas-water separator 1, thereby ensuring the reliability of the system of this disclosure.

[0081] See Figure 1 In one embodiment of this disclosure, the bottom of the gas-liquid separator 1 is provided with a liquid phase outlet and is connected to the liquid pipeline 4; the top of the gas-liquid separator 1 is provided with a gas phase outlet and is connected to the gas pipeline 3.

[0082] In detail, based on density differences and fluid dynamics principles, efficient separation of gas and liquid is ensured. Liquids (such as water, oil, or other liquids) have a higher density than gases and will settle at the bottom of the gas-liquid separator 1 due to gravity. The liquid phase outlet is usually located at the lowest point of the bottom to ensure that the liquid is completely discharged. The liquid phase outlet is connected to the liquid pipeline 4. The liquid discharge speed can be adjusted by the flow regulating valve 41 set on the liquid pipeline 4 to avoid the liquid level in the separator being too high or too low, which would affect the gas-liquid separation efficiency.

[0083] Meanwhile, the gas has a lower density and rises to the top of the separator, where it is discharged as dry gas through the gas phase outlet. This prevents the liquid from being swept up by the airflow. The gas phase outlet is connected to the gas pipeline 3 and needs to match the pressure and flow requirements of the downstream equipment. Optionally, a demister or baffle can be installed at the gas phase outlet in the gas-water separator 1 to further remove residual small droplets.

[0084] See Figure 1 In one embodiment, the gas-water separator 1 of this disclosure is provided with a gas outlet valve 31 at the gas phase outlet.

[0085] Thus, the gas outlet valve 31 can prevent downstream gas from flowing back into the gas-water separator 1 and avoid the liquid in the gas-water separator 1 being carried back into the upstream pipeline. In an emergency, closing the gas outlet valve 31 can quickly cut off the gas flow and prevent the fault from spreading (such as leakage or overpressure). In addition, closing the gas outlet valve 31 can safely empty the gas in the separator, which is convenient for maintenance or replacement of internal components.

[0086] See Figure 1 In one embodiment, the gas separated by the gas-liquid separation of this disclosure is transported to the fuel gas pipeline network through gas pipeline 3; the liquid separated by the gas-liquid separation is transported to the underground tank of the raw material gas compressor through liquid pipeline 4.

[0087] Among them, fuel gas pipeline networks are key infrastructures used in industrial sectors (such as refining and chemical enterprises and oil and gas facilities) to transport and distribute fuel gas, providing a continuous and stable supply of fuel gas for equipment such as heating furnaces and boilers.

[0088] The emissions from the bottom drains of the oil and benzene removal tanks A and B may contain process gas. After the emissions are separated by gas-water separation as disclosed in this invention, the dried process gas is transported to the fuel gas network through gas pipeline 3 for flare combustion, thereby reducing the consumption of raw material gas for the fuel network.

[0089] Meanwhile, the underground tank (or storage tank) of the feed gas compressor is a key auxiliary device in the compressor system, mainly used to store condensate and incompletely vaporized liquids generated during compression, or as a buffer container to balance system pressure. During compression, gas (such as process tail gas) may condense into liquid (such as water, oil, or heavy components) due to pressure increase or temperature change, and needs to be separated by a separator before being stored in the underground tank.

[0090] In the desulfurization facility for silicon-manganese tail gas, before the oil and benzene removal treatment, there is a step of pressurizing by a raw material gas compressor. The gas-liquid separator 1 of this disclosure separates the gas and water in the emissions, and the resulting liquid is sent to the underground tank of the raw material gas compressor in the previous step through the liquid pipeline 4 to recover the separated liquid.

[0091] For better understanding, please refer to the following... Figure 1 The working principle of the closed-loop emission system provided in this disclosure will be explained in detail with an application scenario.

[0092] This disclosure provides a closed-loop emission system for use in a ferrosilicon tail gas desulfurization facility. First, the gas-liquid separator 1 of this system is connected to the bottom drains of the deoiling and benzene-removing tanks A and B of the ferrosilicon tail gas desulfurization facility through two connecting ports at the top, and the discharged material is separated into gas and water, and then transported to the gas pipeline 3 and the liquid pipeline 4 respectively.

[0093] After the liquid level in the gas-liquid separator 1 rises, the flow regulating valve 41 increases its opening based on the liquid level signal detected by the first liquid level gauge, thereby increasing the flow rate in the liquid pipeline 4. When the liquid level drops, the flow regulating valve 41 decreases its opening based on the liquid level signal detected by the first liquid level gauge, thereby decreasing the flow rate in the liquid pipeline 4. When the liquid level in the gas-liquid separator 1 is too low, the second liquid level gauge detects a low liquid level signal, and the emergency shut-off valve 42 automatically closes based on the low liquid level signal.

[0094] When the flow regulating valve 41 needs maintenance, the operator closes the first maintenance valve 43 and the second maintenance valve 44, and at the same time opens the branch line outlet valve 51 to carry out maintenance without affecting the liquid delivery.

[0095] Meanwhile, the liquid at the liquid phase outlet of the gas-liquid separator 1 is sent to the underground tank of the raw material gas compressor through the liquid pipeline 4 for condensate recovery, and the gas at the gas phase outlet is led to the fuel gas pipeline network through the gas pipeline 3 for flare combustion.

[0096] In summary, this disclosure, by setting up a closed discharge system at the bottom of the deoiling and benzene removal tank A and the deoiling and benzene removal tank B, avoids the untimely manual discharge of effluent from entering the subsequent processes of the silicon-manganese tail gas desulfurization facility, effectively controls the liquid level and discharge of effluent in the gas-liquid separator 1, and reduces the impact on the lifespan of the desulfurizing agent and precious metal deoxidizer in the subsequent desulfurization facility.

[0097] Meanwhile, this closed-loop discharge system avoids alarms caused by the direct discharge of process gas from the bottom of the deoiling and benzene removal tanks A and B, eliminates safety hazards and environmental risks during on-site sewage discharge, and reduces the labor intensity of on-site operators.

[0098] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this disclosure is defined by the appended claims.

Claims

1. A closed discharge system applied to a silicon manganese tail gas desulfurization facility, characterized in that, The system includes: Gas-liquid separator (1), the gas-liquid separator (1) is connected to the drain of at least one deoiling and benzene removal tank of the desulfurization facility, and is configured to separate the effluent into gas and liquid and output it to the gas pipeline (3) and the liquid pipeline (4) respectively. A first liquid level detection element (11) is configured to detect the liquid level inside the gas-liquid separator (1); A flow regulating valve (41) is installed on the liquid pipeline (4) and is communicatively connected to the first liquid level detection element (11). It is configured to adjust the flow rate of the liquid pipeline (4) within a preset liquid level range according to the liquid level signal of the first liquid level detection element (11).

2. The closed venting system of claim 1, wherein, The system also includes: The second liquid level detection element (12) is configured to detect the liquid level in the gas-liquid separator (1); An emergency shut-off valve (42) is located on the liquid line (4) upstream of the flow regulating valve (41) and is communicatively connected to the second liquid level detection element (12). The valve is configured to close when the second liquid level detection element (12) detects a low liquid level signal.

3. The closed venting system of claim 2, wherein, The system also includes: The first maintenance valve (43) is located on the liquid line (4) upstream of the flow regulating valve (41) and is configured to connect or disconnect the liquid line (4). The second maintenance valve (44) is located on the liquid line (4) downstream of the flow regulating valve (41) and is configured to connect or disconnect the liquid line (4). The third maintenance valve (13) is located upstream of the first liquid level detection element (11) and is configured to connect or disconnect the first liquid level detection element (11). A fourth maintenance valve (14) is located upstream of the second liquid level detection element (12) and is configured to connect or disconnect the second liquid level detection element (12). The first maintenance valve (43), the second maintenance valve (44), the third maintenance valve (13) and the fourth maintenance valve (14) are normally open.

4. The closed venting system of claim 3, wherein, The system also includes a secondary liquid pipeline (5), one end of which is connected to the liquid pipeline (4) upstream of the first maintenance valve (43), and the other end of which is connected to the liquid pipeline (4) downstream of the second maintenance valve (44). The secondary liquid pipeline (5) is provided with a normally closed secondary outlet valve (51).

5. The closed venting system according to any one of claims 2 to 4, characterized in that, The first liquid level detection element (11) and the second liquid level detection element (12) are liquid level gauges.

6. The closed venting system of claim 5, wherein, The top of the gas-water separator (1) is provided with at least one communication port, which is connected to the drain of the deoiling and benzene-removing tank.

7. The closed venting system of claim 6, wherein, The gas-water separator (1) is provided with a first inlet valve (21) at the connection port.

8. The closed venting system of claim 5, wherein, The bottom of the gas-liquid separator (1) is provided with a liquid phase outlet and is connected to the liquid pipeline (4); The gas-water separator (1) is provided with a gas phase outlet at the top and is connected to the gas pipeline (3).

9. The closed venting system of claim 8, wherein, The gas-water separator (1) is equipped with a gas outlet valve (31) at the gas phase outlet.

10. The closed venting system of claim 1, wherein, The gas separated by gas-liquid separation is transported to the fuel gas pipeline network through the gas pipeline (3); The liquid from the gas-liquid separation is transported to the underground tank of the raw material gas compressor through the liquid pipeline (4).

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