An ethylene oxide tank farm exhaust gas treatment device

Abstract

This utility model provides an ethylene oxide tank farm exhaust gas treatment device, including an exhaust gas inlet pipe, a buffer tank, a first water scrubbing tower, a second water scrubbing tower, a third water scrubbing tower, a water inlet pipe, a wastewater outlet pipe, and a gas outlet pipe. The exhaust gas inlet pipe is fixedly connected to the buffer tank, and the buffer tank is connected to the first water scrubbing tower via a pipe. The top outlet of the first water scrubbing tower is connected to the second water scrubbing tower via a pipe. The top outlet of the second water scrubbing tower is connected to the third water scrubbing tower via a pipe, and the top outlet of the third water scrubbing tower is connected to the gas outlet pipe via a pipe. The arrangement of the buffer tank, first water scrubbing tower, second water scrubbing tower, and third water scrubbing tower in this utility model provides strong safety and can effectively remove harmful substances from the exhaust gas.

Description

Technical Field

[0001] This utility model relates to the field of ethylene oxide technology, and in particular to an ethylene oxide tank farm exhaust gas treatment device. Background Technology

[0002] During storage, ethylene oxide tank farms in the chemical industry intermittently release small amounts of high-concentration waste gas, the main component of which is ethylene oxide, through breather valves. This waste gas poses a dual hazard: firstly, it poses an environmental hazard, as ethylene oxide is a toxic and harmful substance, and direct emission will cause air pollution; secondly, it poses a safety hazard, due to its flammable and explosive properties and wide explosion limits, making its handling extremely risky. Due to safety concerns, most companies are currently forced to adopt direct emission methods, which undoubtedly comes at the expense of the environment. Therefore, developing a targeted waste gas treatment process that can simultaneously achieve efficient purification and inherent safety is urgently needed. However, existing ethylene oxide tank farm waste gas treatment devices still suffer from poor safety and are unable to effectively remove harmful substances from the waste gas.

[0003] Therefore, it is essential to invent a waste gas treatment device for ethylene oxide tank farms. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides an ethylene oxide tank farm exhaust gas treatment device, which solves the problem that existing ethylene oxide tank farm exhaust gas treatment devices still suffer from poor safety and ineffective removal of harmful substances from the exhaust gas. An ethylene oxide tank farm exhaust gas treatment device includes an exhaust gas inlet pipe, a buffer tank, a first water scrubbing tower, a second water scrubbing tower, a third water scrubbing tower, a water inlet pipe, a wastewater outlet pipe, and a gas outlet pipe. The exhaust gas inlet pipe is fixedly connected to the buffer tank, and the buffer tank is connected to the first water scrubbing tower via a pipe. The top outlet of the first water scrubbing tower is connected to the second water scrubbing tower via a pipe. The top outlet of the second water scrubbing tower is connected to the third water scrubbing tower via a pipe, and the top outlet of the third water scrubbing tower is connected to the gas outlet pipe via a pipe.

[0005] The inlet pipe is connected to the first, second, and third water washing towers via an extension pipe, and is also connected to the top of the first, second, and third water washing towers via a water guide pipe; wastewater pipes are installed at the bottom of the first, second, and third water washing towers and are connected to the wastewater outlet pipes.

[0006] The buffer tank is equipped with a tank body, a one-way valve, a pressure transmitter, a rupture disc, and a drain valve. The buffer tank is connected to the exhaust gas input pipe through an air inlet and to the first water scrubbing tower through an air outlet. The one-way valve inside the buffer tank can supply nitrogen gas, and nitrogen gas is automatically supplied when the negative pressure inside the buffer tank is too high to avoid excessive oxygen content in the system.

[0007] The first, second, and third water scrubbing towers consist of three sets of water scrubbing towers, forming a three-stage spray absorption tower. The first water scrubbing tower receives spray water through an inlet pipe, which is then guided to the top of the first water scrubbing tower via a pipeline and sprayed downwards. During the spraying process, the water comes into contact with the upward-floating waste gas and absorbs the ethylene oxide in the waste gas. After the first water scrubbing tower performs the first treatment of the waste gas, it enters the second water scrubbing tower for the second treatment, and then enters the third water scrubbing tower for the third treatment. Finally, the treated waste gas is discharged outwards through the gas discharge pipe at the top of the three water scrubbing towers, and the wastewater is discharged outwards through the wastewater outlet pipe.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] 1. The buffer tank of this utility model serves as the core pretreatment unit for ensuring safe and stable operation of the ethylene oxide tank farm exhaust gas treatment device. Its core functions are mainly reflected in two aspects: process assurance and safety control. At the process level, the buffer tank effectively balances the intermittent airflow fluctuations from the exhaust gas inlet pipe through its volume buffering effect, preparing for the subsequent first water scrubbing tower...

[0010] The second and third water scrubbing towers provide a stable gas supply. Simultaneously, gravity settling achieves gas-liquid separation, trapping potentially condensable liquid components in the waste gas at the bottom of the tank. These components are periodically discharged through a drain valve, preventing liquid substances from impacting the absorption tower system. For safety, the buffer tank integrates a pressure transmitter and a nitrogen inlet check valve to form an active safety system. When an abnormal negative pressure is detected, nitrogen is automatically added to prevent backflow of air through the waste gas inlet pipe, thus eliminating the formation of explosive mixtures. A rupture disc serves as a passive safety device for overpressure relief, providing double protection along with the nitrogen protection system. Only after treatment in the buffer tank can the waste gas enter the subsequent first water scrubbing tower for absorption and treatment. Finally, the purified gas is discharged through the gas outlet pipe, meeting emission standards.

[0011] 2. The first, second, and third water washing towers of this utility model are connected in series to form a core purification unit, which uses the concentration gradient distribution principle to achieve graded absorption:

[0012] The waste gas from the buffer tank undergoes preliminary high-efficiency absorption in the first water scrubbing tower, deep purification in the second water scrubbing tower, and final treatment to meet the standards in the third water scrubbing tower. Spray water is supplied to the top of each tower through the inlet pipe, forming a countercurrent contact mass transfer with the rising waste gas in the packing layer, which allows the ethylene oxide to be fully dissolved. The absorbed wastewater flows into the wastewater outlet pipe through the wastewater pipe at the bottom of each tower, and the finally purified gas is discharged in compliance with the standards through the gas discharge pipe. The three-stage series design significantly improves the removal efficiency and ensures the stability of the system operation. Attached Figure Description

[0013] Figure 1This is a flow chart of the waste gas treatment process for ethylene oxide tank farms according to this utility model.

[0014] In the picture:

[0015] 1. Waste gas inlet pipe, 2. Buffer tank, 3. First water scrubbing tower, 4. Second water scrubbing tower, 5. Third water scrubbing tower, 6. Water inlet pipe, 7. Wastewater outlet pipe, 8. Gas discharge pipe. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0017] As attached Figure 1 As shown.

[0018] This utility model provides an ethylene oxide tank farm exhaust gas treatment device, including an exhaust gas inlet pipe 1, a buffer tank 2, a first water scrubbing tower 3, a second water scrubbing tower 4, a third water scrubbing tower 5, a water inlet pipe 6, a wastewater outlet pipe 7, and a gas outlet pipe 8. The exhaust gas inlet pipe 1 is fixedly connected to the buffer tank 2, and the buffer tank 2 is connected to the first water scrubbing tower 3 via a pipe. The top outlet of the first water scrubbing tower 3 is connected to the second water scrubbing tower 4 via a pipe. The top outlet of the second water scrubbing tower 4 is connected to the third water scrubbing tower 5 via a pipe, and the top outlet of the third water scrubbing tower 5 is connected to the gas outlet pipe 8 via a pipe.

[0019] The inlet pipe 6 is connected to the first water washing tower 3, the second water washing tower 4 and the third water washing tower 5 through an extension pipe, and is also connected to the top of the first water washing tower 3, the second water washing tower 4 and the third water washing tower 5 through a water guide pipe; the bottom of the first water washing tower 3, the second water washing tower 4 and the third water washing tower 5 are provided with wastewater pipes, which are connected to the wastewater outlet pipe 7.

[0020] The buffer tank 2 is equipped with a tank body, a one-way valve, a pressure transmitter, a rupture disc, and a drain valve. The buffer tank 2 is connected to the exhaust gas input pipe 1 through an air inlet and to the first water washing tower 3 through an air outlet. The one-way valve inside the buffer tank 2 can supply nitrogen gas, and nitrogen gas is automatically supplied when the negative pressure inside the buffer tank 2 is too high to avoid excessive oxygen content in the system.

[0021] The first water scrubbing tower 3, the second water scrubbing tower 4, and the third water scrubbing tower 5 are three sets of water scrubbing towers, which together form a three-stage spray absorption tower. The first water scrubbing tower 3 receives spray water through the inlet pipe 6, which is then guided to the top of the first water scrubbing tower 3 through a pipeline and sprayed downwards. During the spraying process, the water comes into contact with the upward-floating waste gas and absorbs the ethylene oxide in the waste gas. After the first water scrubbing tower 3 performs the first treatment of the waste gas, it enters the second water scrubbing tower 4 for the second treatment, and then enters the third water scrubbing tower 5 for the third treatment. Finally, the treated waste gas is discharged to the outside through the gas discharge pipe 8 at the top of the three water scrubbing tower 5, and the wastewater is discharged to the outside through the wastewater discharge pipe 7.

[0022] The working principle of this ethylene oxide tank area exhaust gas treatment device is as follows: High-concentration exhaust gas emitted from the breather valve of the ethylene oxide storage tank enters the buffer tank 2 through the exhaust gas inlet pipe 1. After gas-liquid separation and pressure buffering are completed in the tank, the exhaust gas passes through a three-stage absorption system consisting of the first water scrubbing tower 3, the second water scrubbing tower 4, and the third water scrubbing tower 5. The water inlet pipe 6 supplies spray water to the top of each tower, forming a countercurrent contact with the rising exhaust gas in the packing layer. Through physical absorption, the ethylene oxide in the exhaust gas is gradually dissolved and removed. The purified gas is introduced into the exhaust stack by an explosion-proof fan and discharged at high altitude. The saturated wastewater is collected through the bottom pipes of each tower and sent to the sewage treatment system through the wastewater outlet pipe 7. The nitrogen replenishment system equipped in the buffer tank 2 monitors the pressure inside the tank in real time. When the negative pressure is abnormal, nitrogen is automatically replenished to prevent backflow of air, ensuring that the entire system is always in a safe operating state.

[0023] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. A waste gas treatment device for ethylene oxide tank farms, characterized in that: It includes an exhaust gas inlet pipe (1), a buffer tank (2), a first water scrubbing tower (3), a second water scrubbing tower (4), a third water scrubbing tower (5), a water inlet pipe (6), a wastewater outlet pipe (7), and a gas outlet pipe (8), wherein: the exhaust gas inlet pipe (1) is fixedly connected to the buffer tank (2), and the buffer tank (2) is connected to the first water scrubbing tower (3) through a pipe, and the top outlet of the first water scrubbing tower (3) is connected to the second water scrubbing tower (4) through a pipe; the top outlet of the second water scrubbing tower (4) is connected to the third water scrubbing tower (5) through a pipe, and the top outlet of the third water scrubbing tower (5) is connected to the gas outlet pipe (8) through a pipe.

2. The ethylene oxide tank farm exhaust gas treatment device as described in claim 1, characterized in that: The inlet pipe (6) is connected to the first water washing tower (3), the second water washing tower (4) and the third water washing tower (5) through an extension pipe, and is connected to the top of the first water washing tower (3), the second water washing tower (4) and the third water washing tower (5) through a water guide pipe; the bottom of the first water washing tower (3), the second water washing tower (4) and the third water washing tower (5) is provided with a wastewater pipe, which is connected to the wastewater outlet pipe (7).

3. The ethylene oxide tank farm exhaust gas treatment device as described in claim 1, characterized in that: The buffer tank (2) is equipped with a tank body, a one-way valve, a pressure transmitter, a rupture disc, and a drain valve. The buffer tank (2) is connected to the waste gas input pipe (1) through the air inlet and to the first water washing tower (3) through the air outlet. The one-way valve inside the buffer tank (2) can supply nitrogen gas. When the negative pressure inside the buffer tank (2) is too high, nitrogen gas is automatically supplied to avoid excessive oxygen content in the system.

4. The ethylene oxide tank farm exhaust gas treatment device as described in claim 1, characterized in that: The first water scrubbing tower (3), the second water scrubbing tower (4) and the third water scrubbing tower (5) are three sets of water scrubbing towers, which together form a three-stage spray absorption tower. The first water scrubbing tower (3) enters the spray water through the inlet pipe (6) and is guided to the top of the first water scrubbing tower (3) through the pipeline. Then it is sprayed downwards. During the spraying process, it will come into contact with the upward floating waste gas and absorb the ethylene oxide in the waste gas. After the first water scrubbing tower (3) performs the first treatment of the waste gas, it enters the second water scrubbing tower (4) for the second treatment, and then enters the third water scrubbing tower (5) for the third treatment. Finally, the treated waste gas is discharged to the outside through the gas discharge pipe (8) at the top of the three water scrubbing tower (5), and the wastewater is discharged to the outside through the wastewater discharge pipe (7).

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