Gas-liquid separation system for tetrahydrofuran tail gas

Abstract

The utility model discloses a gas-liquid separation system for tetrahydrofuran tail gas, relates to the technical field of hazardous waste treatment, and mainly aims to separate condensate in the tetrahydrofuran tail gas and avoid tempering of a heating medium furnace. According to the main technical scheme, the tetrahydrofuran tail gas gas-liquid separation system comprises a pretreatment part and a separation tank, the pretreatment part comprises an intermediate tank, a condenser and a first fan which are connected in sequence; a central baffle plate is arranged in the separation tank, a first interval is formed between the lower end of the central baffle plate and the bottom wall of the separation tank, packing layers are arranged in the inner space of the separation tank on the two sides of the central baffle plate respectively, an air outlet pipe of the first fan is connected to a first position of the top wall of the separation tank, and an air outlet pipe of the second fan is connected to a second position of the top wall of the separation tank. The second position of the top wall of the separation tank is connected to a heating medium furnace through an exhaust pipe, the first position and the second position are located on the two sides of the center baffle plate respectively, and the lower end of the separation tank is connected to the upper end of the intermediate tank.

Description

Technical Field

[0001] The utility model relates to the technical field of hazardous waste treatment, in particular to a gas-liquid separation system for tetrahydrofuran tail gas. Background Art

[0002] Tetrahydrofuran is a commonly used organic solvent and is widely used in industrial production. However, the volatility and toxicity of tetrahydrofuran make the treatment of its tail gas an important issue. In order to protect the environment and save energy, it is very necessary to recover and treat the tetrahydrofuran tail gas.

[0003] At present, the tetrahydrofuran generated by the main device production is centrally collected by the main device tail gas fan, and the tail gas generated by the tetrahydrofuran recovery unit is centrally collected by the tetrahydrofuran recovery unit tail gas fan. The main device and the tetrahydrofuran recovery unit tail gas fans transport the tetrahydrofuran tail gas to the heat medium furnace for incineration. However, due to temperature changes during the transportation process, condensate will be generated in the pipeline by the gas. Currently, the tail gas condensate is usually recovered by manually opening the pipeline drain at the site. There is a large amount of tetrahydrofuran in the condensate. This treatment method will cause the gas in the condensate to disperse, resulting in operators directly contacting production harmful substances and environmental pollution. When the condensate cannot be discharged in time, a large amount of condensate is transported to the heat medium furnace, causing the heat medium furnace to flashback, resulting in risks such as fire and explosion. A small amount of condensate flows to the heat medium furnace, leading to environmental protection incidents where the nitrogen oxides in the heat medium furnace exceed the standard during the tail gas incineration process. At the same time, when the condensate cannot be discharged in time, the condensate runs into the main device tail gas pipeline, causing the main device fan to trip and resulting in problems such as abnormal device production. Summary of the Utility Model

[0004] In view of this, the utility model provides a gas-liquid separation system for tetrahydrofuran tail gas, and the main purpose is to separate the condensate in the tetrahydrofuran tail gas to avoid the heat medium furnace from flashing back.

[0005] To achieve the above purpose, the utility model mainly provides the following technical solutions:

[0006] The utility model provides a gas-liquid separation system for tetrahydrofuran tail gas, and the system includes: a pretreatment part and a separation tank;

[0007] The pretreatment part includes an intermediate tank, a condenser and a first fan connected in sequence;

[0008] A central baffle is provided inside the separation tank. A first gap is provided between the lower end of the central baffle and the bottom wall of the separation tank. Packing layers are respectively provided in the internal spaces of the separation tank on both sides of the central baffle. The air outlet pipe of the first fan is connected to a first position on the top wall of the separation tank. The second position on the top wall of the separation tank is connected to the heat medium furnace through an exhaust pipe. The first position and the second position are respectively located on both sides of the central baffle. The lower end of the separation tank is connected to the upper end of the intermediate tank.

[0009] The object of the present utility model and the technical problems to be solved can be further achieved by adopting the following technical measures.

[0010] Optionally, it further includes a first baffle and a second baffle. The first baffle and the second baffle are respectively located on both sides of the central baffle. A second gap is provided between the upper end of the first baffle and the top wall of the separation tank. A third gap is provided between the upper end of the second baffle and the top wall of the separation tank. The packing layer is located between the first baffle and the second baffle.

[0011] Optionally, the lower end of the first baffle is provided with a first through hole, and the lower end of the second baffle is provided with a second through hole.

[0012] Optionally, it further includes a transfer pump. The lower end of the separation tank is connected to the inlet of the transfer pump, and the outlet of the transfer pump is connected to the upper end of the intermediate tank.

[0013] Optionally, the free end of the air outlet pipe penetrates the top wall of the separation tank. The free end of the air outlet pipe is lower than the upper end of the first baffle. The air outlet pipe is located between the first baffle and the side wall of the separation tank. The exhaust pipe penetrates the top wall of the separation tank. The free end of the exhaust pipe is higher than the upper end of the second baffle. The exhaust pipe is located between the second baffle and the side wall of the separation tank.

[0014] Optionally, it further includes a second fan. The inlet of the intermediate tank is connected to the tetrahydrofuran tail gas recovery unit. The inlet of the second fan is connected to the tetrahydrofuran main device unit. The outlet of the second fan is connected to the air outlet pipe.

[0015] Optionally, the separation tank is equipped with a first liquid level sensor, and the intermediate tank is equipped with a second liquid level sensor. The first liquid level sensor, the second liquid level sensor and the transfer pump are integrated into the DCS control system.

[0016] By means of the above technical solutions, the present utility model has at least the following advantages:

[0017] The waste gas in the intermediate tank for esterification wastewater successively passes through a condenser and a first blower and enters a separation tank. When the waste gas passes through the condenser, part of the waste gas condenses and flows back to the intermediate tank, and the other part of the waste gas enters the separation tank. The waste gas successively passes through a packing layer and flows around both sides of a central baffle in a folded shape. The heavy components in the waste gas are captured by the packing layer and liquefied, settle at the lower part of the separation tank, and flow back to the intermediate tank. The light components in the waste gas enter a heat medium furnace through an exhaust pipe.

[0018] Through the above arrangement, it is avoided that condensate flows into the heat medium furnace and causes backfire, and the recycling of condensate is also realized, avoiding the diffusion of harmful gases and environmental pollution caused by the external discharge of condensate. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of a gas-liquid separation system for tetrahydrofuran tail gas provided by an embodiment of the present utility model.

[0020] The reference numerals in the drawings of the specification include: intermediate tank 1, condenser 2, first blower 3, central baffle 4, packing layer 5, gas outlet pipe 6, exhaust pipe 7, first baffle 8, second baffle 9, first through hole 10, second through hole 11, transfer pump 12, second blower 13, first liquid level sensor 14, second liquid level sensor 15, heat medium furnace 16. Detailed Embodiments

[0021] To further elaborate on the technical means and effects adopted by the present utility model to achieve the intended utility model purpose, the following combines the drawings and preferred embodiments to detail the specific embodiments, structures, features and their effects according to the application of the present utility model. In the following description, different "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0022] The present utility model will be further described in detail below with reference to the drawings and embodiments.

[0023] As Figure 1 shown, a gas-liquid separation system for tetrahydrofuran tail gas provided by an embodiment of the present utility model includes: a pretreatment part and a separation tank;

[0024] The pretreatment part includes an intermediate tank 1, a condenser 2 and a first blower 3 connected in sequence;

[0025] A central baffle 4 is arranged inside the separation tank. A first gap is provided between the lower end of the central baffle 4 and the bottom wall of the separation tank. Packing layers 5 are respectively arranged in the internal spaces of the separation tank on both sides of the central baffle 4. The air outlet pipe 6 of the first fan 3 is connected to a first position on the top wall of the separation tank. A second position on the top wall of the separation tank is connected to the heat medium furnace 16 through an exhaust pipe 7. The first position and the second position are respectively located on both sides of the central baffle 4. The lower end of the separation tank is connected to the upper end of the intermediate tank 1.

[0026] The working process of a tetrahydrofuran tail gas gas-liquid separation system is as follows:

[0027] The waste gas in the intermediate tank 1 of the esterification wastewater first passes through the condenser 2 and the first fan 3 and enters the separation tank. When the waste gas passes through the condenser 2, part of the waste gas condenses and flows back to the intermediate tank 1, and the other part of the waste gas enters the separation tank. The waste gas successively passes through the packing layer 5 and flows through the spaces on both sides of the central baffle 4 in a zigzag manner. The heavy components in the waste gas are captured by the packing layer 5 and liquefied, settle at the lower part of the separation tank, and flow back to the intermediate tank 1. The light components in the waste gas enter the heat medium furnace 16 through the exhaust pipe 7.

[0028] Through the above settings, it is avoided that the condensate flows into the heat medium furnace 16 and causes backfire, and the recycling of the condensate is also realized, avoiding the diffusion of harmful gases and environmental pollution caused by the external discharge of the condensate.

[0029] Specifically, the waste gas enters the separation tank from the first position, flows downward to the first gap, and then flows upward and back to the second position. During the above-mentioned back-and-forth process, the packing layer 5 captures the heavy components in the waste gas and liquefies the heavy components.

[0030] Specifically, the packing layer 5 adopts a stainless steel wire mesh corrugated packing.

[0031] Specifically, the condenser 2 adopts a vertical shell and tube heat exchanger.

[0032] As Figure 1 shown, in the specific embodiment, it further includes a first baffle 8 and a second baffle 9. The first baffle 8 and the second baffle 9 are respectively located on both sides of the central baffle 4. A second gap is provided between the upper end of the first baffle 8 and the top wall of the separation tank. A third gap is provided between the upper end of the second baffle 9 and the top wall of the separation tank. The packing layer 5 is located between the first baffle 8 and the second baffle 9.

[0033] In this embodiment, specifically, in the separation tank, the waste gas successively passes through the second gap, the first gap, and the third gap, so that the waste gas successively passes through the packing layers 5 on both sides of the central baffle 4, and the heavy components are captured.

[0034] Moreover, the space between the first baffle plate 8 and the side wall of the separation tank can temporarily store a certain volume of condensate, and the space between the second baffle plate 9 and the side wall of the separation tank can also temporarily store a certain volume of condensate. When there is a large amount of condensate in these two parts, the condensate can overflow the upper ends of the first baffle plate 8 and the second baffle plate 9, gather in the middle of the separation tank, and be discharged from the lower end of the separation tank to the intermediate tank 1.

[0035] Specifically, the discharge port at the lower end of the separation tank is connected to the upper end of the intermediate tank 1 through a reflux pipe, and the discharge port is located between the first baffle plate 8 and the second baffle plate 9.

[0036] As Figure 1 shown, in the specific embodiment, a first through hole 10 is provided at the lower end of the first baffle plate 8, and a second through hole 11 is provided at the lower end of the second baffle plate 9.

[0037] In this embodiment, through the first through hole 10, the condensate on both sides of the first baffle plate 8 is interconnected; through the second through hole 11, the condensate on both sides of the second baffle plate 9 is interconnected, so that the condensate in the lower space of the separation tank is interconnected, and the liquid levels of the condensate in different regions in the separation tank can be stably consistent;

[0038] Moreover, during the operation of the device, after the condensate submerges the first through hole 10 and the second through hole 11, the uncondensed waste gas cannot pass through the first through hole 10 and the second through hole 11, ensuring the limitation of the flow path of the waste gas by the folded flow path in the separation tank.

[0039] As Figure 1 shown, in the specific embodiment, it further includes a transfer pump 12. The lower end of the separation tank is connected to the inlet of the transfer pump 12, and the outlet of the transfer pump 12 is connected to the upper end of the intermediate tank 1.

[0040] In this embodiment, specifically, when the liquid level of the condensate in the separation tank is relatively high, the operator starts the transfer pump 12 to transfer the condensate in the separation tank to the intermediate tank 1.

[0041] As Figure 1 shown, in the specific embodiment, the free end of the outlet pipe 6 penetrates the top wall of the separation tank. The free end of the outlet pipe 6 is lower than the upper end of the first baffle plate 8. The outlet pipe 6 is located between the first baffle plate 8 and the side wall of the separation tank. The exhaust pipe 7 penetrates the top wall of the separation tank. The free end of the exhaust pipe 7 is higher than the upper end of the second baffle plate 9. The exhaust pipe 7 is located between the second baffle plate 9 and the side wall of the separation tank.

[0042] In this embodiment, specifically, the free end of the outlet pipe 6 is lower than the upper end of the first baffle 8, and the exhaust gas discharged from the outlet pipe 6 needs to rise a certain distance before it can turn over the first baffle 8, thereby extending the flow range of the exhaust gas and improving the efficiency of condensation and liquefaction of the heavy components in the exhaust gas;

[0043] The free end of the exhaust pipe 7 is higher than the upper end of the second baffle 9, which makes it easier for the light components in the exhaust gas to flow over the second baffle 9 and be discharged from the separation tank along the exhaust pipe 7 without baffle.

[0044] like Figure 1 As shown, in a specific embodiment, it also includes a second fan 13, the inlet of the intermediate tank 1 is connected to the tetrahydrofuran tail gas recovery unit, the inlet of the second fan 13 is connected to the tetrahydrofuran main device unit, and the outlet of the second fan 13 is connected to the exhaust pipe 6.

[0045] In this embodiment, specifically, the intermediate tank 1 collects the exhaust gas of the recovery unit, and the second fan 13 collects the exhaust gas of the main device. The two parts of the exhaust gas are concentrated into the separation tank. At the same time, due to the gas-liquid separation effect of the separation tank, the condensate is prevented from flowing back to the first fan 3 and the second fan 13, and the fan is prevented from tripping.

[0046] like Figure 1 As shown, in a specific embodiment, the separation tank is installed with a first liquid level sensor 14, the intermediate tank 1 is installed with a second liquid level sensor 15, and the first liquid level sensor 14, the second liquid level sensor 15 and the delivery pump 12 are integrated into a DCS control system.

[0047] In this embodiment, specifically, when the first liquid level sensor 14 monitors that the liquid level in the separation tank is at a high level, the central processor of the DCS control system starts the delivery pump 12 to deliver the condensate in the separation tank to the intermediate tank 1; at the same time, when the second liquid level sensor 15 monitors that the liquid level in the intermediate tank 1 is at a high level, the DCS control system stops the operation of the delivery pump 12.

[0048] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A gas-liquid separation system for tetrahydrofuran tail gas, characterized in that, Comprising: A pretreatment section, the pretreatment section including a middle tank, a condenser and a first fan connected in sequence; A separation tank, in which a central baffle is provided. There is a first gap between the lower end of the central baffle and the bottom wall of the separation tank. Packing layers are respectively provided in the inner spaces of the separation tank on both sides of the central baffle. The air outlet pipe of the first fan is connected to a first position on the top wall of the separation tank. The second position on the top wall of the separation tank is connected to a hot medium furnace through an exhaust pipe. The first position and the second position are respectively located on both sides of the central baffle. The lower end of the separation tank is connected to the upper end of the middle tank.

2. The tetrahydrofuran tail gas gas-liquid separation system according to claim 1, wherein It further includes a first baffle and a second baffle, the first baffle and the second baffle are respectively located on both sides of the central baffle. There is a second gap between the upper end of the first baffle and the top wall of the separation tank. There is a third gap between the upper end of the second baffle and the top wall of the separation tank. The packing layer is located between the first baffle and the second baffle.

3. The tetrahydrofuran tail gas gas-liquid separation system according to claim 2, wherein The lower end of the first baffle is provided with a first through hole, and the lower end of the second baffle is provided with a second through hole.

4. The tetrahydrofuran tail gas gas-liquid separation system according to claim 1, wherein It further includes a transfer pump. The lower end of the separation tank is connected to the inlet of the transfer pump, and the outlet of the transfer pump is connected to the upper end of the middle tank.

5. The tetrahydrofuran tail gas gas-liquid separation system according to claim 2, wherein The free end of the air outlet pipe penetrates the top wall of the separation tank. The free end of the air outlet pipe is lower than the upper end of the first baffle. The air outlet pipe is located between the first baffle and the side wall of the separation tank. The exhaust pipe penetrates the top wall of the separation tank. The free end of the exhaust pipe is higher than the upper end of the second baffle. The exhaust pipe is located between the second baffle and the side wall of the separation tank.

6. The tetrahydrofuran tail gas gas-liquid separation system according to any one of claims 1 to 5, wherein It further includes a second fan. The inlet of the middle tank is connected to a tetrahydrofuran tail gas recovery unit. The inlet of the second fan is connected to a tetrahydrofuran main device unit. The outlet of the second fan is connected to the air outlet pipe.

7. The tetrahydrofuran tail gas gas-liquid separation system according to claim 4, wherein A first liquid level sensor is installed on the separation tank, a second liquid level sensor is installed on the middle tank, and the first liquid level sensor, the second liquid level sensor and the transfer pump are integrated into a DCS control system.

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