A kind of ethylene oxide sterilization waste gas purification device

Abstract

The utility model discloses an ethylene oxide sterilization waste gas purification device, which comprises an absorption tower, a reaction tank, a sulfuric acid storage tank, a neutralization tank, a sodium hydroxide storage tank and a circulation tank. The absorption tower is composed of an upper cavity, a middle cavity and a lower cavity, and is provided with a liquid distributor and a packing layer. The middle cavity is connected to a sulfuric acid input pipe, and the lower cavity is connected to an exhaust gas input pipe and is in communication with the reaction tank. The reaction tank adopts a multi-chamber structure, the first chamber is connected to a water inlet pipe, and the last chamber is connected to a heat exchanger through a first circulation pump and is connected to the middle cavity of the absorption tower. The sulfuric acid storage tank supplies sulfuric acid solution to the absorption tower and the reaction tank through a first dosing pump. The neutralization tank is connected to the reaction tank through a pipeline, and the neutralized waste liquid is discharged through a discharge pump. The sodium hydroxide storage tank supplies sodium hydroxide solution to the neutralization tank through a second dosing pump. The circulation tank is connected to the neutralization tank through a second circulation pump, and is connected to the absorption tower through a jet pump.

Description

Technical Field

[0001] The utility model relates to the technical field of air pollution control, in particular to an ethylene oxide sterilization waste gas purification device. Background Art

[0002] Ethylene oxide is a chemical commonly used for sterilization, and is widely used in the sterilization of medical devices, medicines and foods. However, the chemical properties of ethylene oxide are very active and can react with many compounds. Ethylene oxide is also flammable and has the risk of combustion and explosion when exposed to high temperatures and open flames. Ethylene oxide is also a moderately toxic substance that can cause great harm to the human body. Experiments have shown that it has potential carcinogenic effects on experimental animals.

[0003] In view of the physical and chemical properties of ethylene oxide, the small amount of ethylene oxide waste gas generated by industrial production of other products cannot be discharged directly into the atmosphere. Instead, the waste gas needs to be treated to meet the relevant national emission standards before being discharged. Therefore, it is urgent to develop an ethylene oxide waste gas purification device. Utility Model Content

[0004] The utility model aims to provide an ethylene oxide sterilization waste gas purification device, which can effectively treat ethylene oxide waste gas, meet relevant national emission standards, and ensure the environmental protection and safety of waste gas emissions.

[0005] The utility model solves the above problems by adopting the following technical solution: an ethylene oxide sterilization waste gas purification device, comprising:

[0006] Absorption tower: from top to bottom, an upper cavity, a middle cavity and a lower cavity are provided respectively, a liquid distributor is provided between the upper cavity and the middle cavity, a packing layer is provided between the middle cavity and the lower cavity, the middle cavity is connected to a sulfuric acid input pipe, the lower cavity is connected to an exhaust gas input pipe and the lower cavity is connected to the reaction tank;

[0007] Reaction tank: The reaction tank adopts a multi-chamber structure, the first chamber of which is connected to a water inlet pipe, and the last chamber is connected to a heat exchanger through a first circulation pump. The other end of the heat exchanger is connected to the middle cavity of the absorption tower, which reduces the temperature of the reflux from the reaction tank to the absorption tower through cooling water;

[0008] Sulfuric acid storage tank: storing sulfuric acid solution, and introducing the sulfuric acid solution into the middle cavity of the absorption tower and the first cavity of the reaction tank through the first dosing pump;

[0009] Neutralization tank: connected to the reaction tank through a pipeline to neutralize the waste liquid generated in the reaction tank. The neutralization tank is connected to a discharge pump to lead the neutralized waste liquid to the subsequent treatment area;

[0010] Sodium hydroxide storage tank: stores sodium hydroxide solution, and drives the sodium hydroxide solution into the neutralization tank through the second dosing pump;

[0011] Circulation tank: connected to the neutralization tank through the second circulation pump, and connected to the upper cavity of the absorption tower through the jet pump.

[0012] Preferably, the reaction tank adopts a multi-chamber structure, and guide baffles are staggered and obliquely arranged on both sides of adjacent chambers. The guide baffles adopt a hollow mesh structure and are filled with a solid acid catalyst.

[0013] Preferably, the reaction tank and the circulation tank are both connected with a nitrogen input pipe, wherein the nitrogen input pipe connected to the reaction tank is in communication with the last chamber.

[0014] Preferably: an electric heater is provided in the first chamber of the reaction tank.

[0015] Preferably, the filler layer is made of plastic filler.

[0016] Preferably, the packing height of the packing layer is 60% to 80% of the height of the absorption tower.

[0017] Preferably: a pH meter is installed on the top of the neutralization tank, and the second dosing pump and the discharge pump are controlled by the pH meter.

[0018] Preferably, a stirrer is installed on the top of the neutralization tank to ensure uniform concentration distribution of the solution in the tank.

[0019] Preferably: the reaction tank and the absorption tower are both equipped with a heat insulation layer.

[0020] Compared with the prior art, the utility model has the following advantages and effects:

[0021] The utility model discloses an ethylene oxide sterilization waste gas purification device. The multi-layer structure and filler design of the absorption tower improve the gas-liquid contact efficiency. The multi-chamber and guide baffle design of the reaction tank improves the efficiency of the hydrolysis reaction. The automatic dosing system of the neutralization tank ensures the effective neutralization treatment of the waste liquid. In addition, the setting of the electric heater and the heat exchanger effectively controls the system temperature. Through the coordinated work of the absorption tower, the reaction tank, the circulation tank, the neutralization tank and related accessories, the stability and efficiency of the entire treatment process are maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an ethylene oxide sterilization waste gas purification device according to an embodiment of the utility model.

[0023] Figure 2 It is a structural schematic diagram of an absorption tower according to an embodiment of the utility model.

[0024] Figure 3 It is a structural schematic diagram of a circulation tank in an embodiment of the utility model.

[0025] Figure 4 It is a structural schematic diagram of a neutralization tank in an embodiment of the utility model.

[0026] Figure 5 It is a structural schematic diagram of the guide baffle of the embodiment of the utility model.

[0027] Figure numbers: absorption tower 1, upper cavity 11, middle cavity 12, lower cavity 13, liquid distributor 14, demister 15, packing layer 16, sulfuric acid input pipe 17, exhaust gas input pipe 18, reaction tank 2, water inlet pipe 21, first circulation pump 22, heat exchanger 23, nitrogen input pipe 24, electric heater 25, sulfuric acid storage tank 3, first dosing pump 31, neutralization tank 4, discharge pump 41, pH meter 42, liquid level sensor 43, agitator 44, sodium hydroxide storage tank 5, second dosing pump 51, circulation tank 6, second circulation pump 61, jet pump 62, pressure sensor 63, flow meter 64, guide baffle 7, mesh structure 71, solid acid catalyst 72, insulation layer 8. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0029] Example:

[0030] See also Figure 1 - Figure 4 In this embodiment, an ethylene oxide sterilization waste gas purification device is provided, which is specifically used to purify the waste gas generated during the ethylene oxide sterilization process, and specifically includes

[0031] Absorption tower 1: from top to bottom, an upper cavity 11, a middle cavity 12 and a lower cavity 13 are respectively provided, a liquid distributor 14 is provided between the upper cavity 11 and the middle cavity 12, a packing layer 16 is provided between the middle cavity 12 and the lower cavity 13, the middle cavity 12 is connected to a sulfuric acid input pipe 17, the lower cavity 13 is connected to an exhaust gas input pipe 18, and the lower cavity 13 is connected to the reaction tank 2; the liquid distributor 14 in this embodiment adopts a perforated plate type distributor to ensure uniform distribution of the liquid so that the packing layer 16 can be fully wetted, and a demister 15 is also installed above the liquid distributor 14. This embodiment adopts a cyclone plate demister 15 to remove droplets brought out of the gas overflowing from the top of the packing layer 16.

[0032] Reaction tank 2: The reaction tank 2 adopts a multi-chamber structure, the first chamber of which is connected to a water inlet pipe 21, and the last chamber is connected to a heat exchanger 23 through a first circulation pump 22. The other end of the heat exchanger 23 is connected to the middle cavity 12 of the absorption tower 1, and the temperature of the reflux from the reaction tank 2 to the absorption tower 1 is reduced by cooling water;

[0033] Sulfuric acid storage tank 3: stores sulfuric acid solution, and introduces the sulfuric acid solution into the middle cavity 12 of the absorption tower 1 and the first cavity of the reaction tank 2 through the first dosing pump 31; because the hydration rate of ethylene oxide will be significantly increased under acidic conditions, so in order to achieve the purpose of improving efficiency, 1% concentration sulfuric acid is added to the reaction tank 2 as a catalyst.

[0034] Neutralization tank 4: connected to reaction tank 2 through a pipeline, neutralizes the waste liquid generated in reaction tank 2, and is connected to a discharge pump 41 to guide the neutralized waste liquid to a subsequent treatment area;

[0035] The sodium hydroxide storage tank 5 stores sodium hydroxide solution, and drives the sodium hydroxide solution to be introduced into the neutralization tank 4 through the second dosing pump 51 .

[0036] Circulation tank 6: connected to neutralization tank 4 through second circulation pump 61, and connected to upper cavity 11 of absorption tower 1 through jet pump 62; jet pump 62 not only provides flow power for nitrogen and ethylene oxide mixed gas, but also provides circulation power for sulfuric acid solution. Jet pump 62 is pre-installed with pressure sensor 63 and flow meter 64 to monitor the circulation system to avoid fluid interruption due to special circumstances.

[0037] The utility model is an ethylene oxide sterilization waste gas purification device. The multi-layer structure and filler design of the absorption tower 1 improve the gas-liquid contact efficiency. The multi-chamber and guide baffle 7 design of the reaction tank 2 improves the efficiency of the hydrolysis reaction. The automatic dosing system of the neutralization tank 4 ensures the effective neutralization treatment of the waste liquid. In addition, the setting of the electric heater 25 and the heat exchanger 23 effectively controls the system temperature. Through the coordinated work of the absorption tower 1, the reaction tank 2, the circulation tank 6, the neutralization tank 4 and related accessories, the stability and efficiency of the entire treatment process are maintained. The utility model can effectively treat ethylene oxide waste gas, meet the relevant national emission standards, and ensure the environmental protection and safety of waste gas emissions.

[0038] See also Figure 5, the reaction tank 2 adopts a multi-chamber structure, and each chamber is separated by a guide baffle 7. Specifically, staggered oblique guide baffles 7 are provided between adjacent chambers of the reaction tank 2, and the guide baffles 7 adopt a hollow mesh structure 71, and a solid acid catalyst 72 is filled inside. In order to provide sufficient liquid residence time, the reaction tank 2 is divided into 5 chambers in this embodiment, and these chambers are isolated by the guide baffle 7. The oblique setting mode of the guide baffle 7 makes the fluid present a tortuous flow path in the reaction tank 2, thereby increasing the residence and reaction time of the exhaust gas in the reaction tank 2, and improving the effect of exhaust gas treatment. The guide baffle 7 adopts a mesh structure 71, which can cause turbulence of the exhaust gas when it flows through the guide baffle 7, enhance the contact between the exhaust gas and the solid acid catalyst 72, and thus increase the reaction rate. Among them, the solid acid catalyst 72 is filled in the hollow structure of the guide baffle 7 to enhance the hydrolysis reaction of ethylene oxide.

[0039] In this embodiment, the reaction tank 2 and the circulation tank 6 are both connected to a nitrogen inlet pipe 24, wherein the nitrogen inlet pipe 24 connected to the reaction tank 2 is connected to the last chamber, and the mixture of ethylene oxide and water is guided through the pipe at the bottom of the chamber of the reaction tank 2. The waste gas is separated through the gap on the top guide baffle 7. By introducing a continuous flow of nitrogen into the last chamber to make it pass through the chamber in reverse, part of the waste gas that may escape from the solution is brought back to the outlet of the paint washing tower and subjected to a hydrolysis reaction again, so as to further improve the effect of waste gas purification treatment.

[0040] An electric heater 25 is provided in the first chamber of the reaction tank 2. The utility model takes into account the process requirements and economic rationality, and adopts a circulation system. Low temperature is conducive to absorption, and the ambient temperature needs to be lowered. When ethylene oxide is absorbed and undergoes a hydrolysis reaction with water, a high temperature is conducive to the reaction, and the ambient temperature needs to be increased. Taking all factors into consideration, an electric heater 25 is added to the reaction tank 2 to increase the temperature in the reaction tank 2 to 40°C. In addition, the reaction tank 2 and the absorption tower 1 are both equipped with an insulation layer 8 to reduce heat loss. A heat exchanger 23 is added to the circulating water system, and the temperature of the absorption liquid output from the first circulation pump 22 is reduced to 35°C through the heat exchanger 23, and the cooled absorption liquid is re-input into the top of the packing layer 16 of the middle cavity 12.

[0041] The packing layer 16 is made of plastic packing, and the materials of the plastic packing include polypropylene (PP), polyethylene (PE), polyvinylidene fluoride (PVDF) and polyvinyl chloride (PVC). The plastic packing has good corrosion resistance and can resist corrosion from general inorganic acids, alkalis and organic solvents. It has good temperature resistance and can be used for a long time in an environment of 100°C. For the process of water absorbing ethylene oxide, plastic packing can be used at 35°C and normal pressure. Selection of tower packing These packings can be selected according to specific circumstances, such as Raschig rings, spiral rings, or Bell saddles. These packings provide a larger contact area for the reaction. The packings are placed in metal mesh boxes, which are supported on plates near the bottom of the absorption tower 1. The absorption liquid flows evenly through these packings and then flows downward through the packing bed. The fluid covers these packings and forms a thin film around the packing, and the pollutants in the fluid will be adsorbed on these films. Too high a packing layer 16 will increase the flow resistance of the exhaust gas. In this embodiment, by setting the height of the packing layer 16 to 60% to 80% of the height of the absorption tower 1, efficient absorption can be achieved without significantly increasing the pressure drop.

[0042] A pH meter 42 is installed on the top of the neutralization tank 4, and the second dosing pump 51 and the discharge pump 41 are controlled by the pH meter 42. To meet the requirements, the sulfuric acid solution in the discharge needs to be neutralized. The sodium hydroxide solution is introduced into the neutralization tank 4 through the second dosing pump 51. The second dosing pump 51 is controlled by the pH meter 42. An agitator 44 is installed on the top of the neutralization tank 4 to make the concentration of the solution in the tank uniform. The neutralization tank 4 is also equipped with a liquid level sensor 43. When the pH value reaches the range of 7 to 9 and the liquid level of the neutralization tank 4 is at the set value, the discharge pump 41 starts to work and guides the wastewater to the ethylene glycol recovery and reuse area. Wastewater containing ethylene glycol can be used as a coolant in other areas of the factory.

[0043] The above contents described in this specification are merely examples of the present utility model. Those skilled in the art of the present utility model may make various modifications or additions to the specific embodiments described, or replace them in similar ways, as long as they do not deviate from the contents of the present utility model specification or exceed the scope defined in the claims, they shall all fall within the protection scope of the present utility model.

Claims

1. An ethylene oxide sterilization waste gas purification device, characterized in that: include Absorption tower: from top to bottom, an upper cavity, a middle cavity and a lower cavity are provided respectively, a liquid distributor is provided between the upper cavity and the middle cavity, a packing layer is provided between the middle cavity and the lower cavity, the middle cavity is connected to a sulfuric acid input pipe, the lower cavity is connected to an exhaust gas input pipe and the lower cavity is connected to the reaction tank; Reaction tank: The reaction tank adopts a multi-chamber structure, the first chamber of which is connected to a water inlet pipe, and the last chamber is connected to a heat exchanger through a first circulation pump. The other end of the heat exchanger is connected to the middle cavity of the absorption tower, which reduces the temperature of the reflux from the reaction tank to the absorption tower through cooling water; Sulfuric acid storage tank: storing sulfuric acid solution, and introducing the sulfuric acid solution into the middle cavity of the absorption tower and the first cavity of the reaction tank through the first dosing pump; Neutralization tank: connected to the reaction tank through a pipeline to neutralize the waste liquid generated in the reaction tank. The neutralization tank is connected to a discharge pump to lead the neutralized waste liquid to the subsequent treatment area; Sodium hydroxide storage tank: stores sodium hydroxide solution, and drives the sodium hydroxide solution into the neutralization tank through the second dosing pump; Circulation tank: connected to the neutralization tank through the second circulation pump, and connected to the upper cavity of the absorption tower through the jet pump.

2. The ethylene oxide sterilization waste gas purification device according to claim 1, characterized in that: The reaction tank adopts a multi-chamber structure, and flow guide baffles are staggered and obliquely arranged on both sides of adjacent chambers. The flow guide baffles adopt a hollow mesh structure and are filled with a solid acid catalyst.

3. The ethylene oxide sterilization waste gas purification device according to claim 2, characterized in that: The reaction tank and the circulation tank are both connected with a nitrogen input pipe, wherein the nitrogen input pipe connected with the reaction tank is in communication with the last chamber.

4. The ethylene oxide sterilization waste gas purification device according to claim 3, characterized in that: The first chamber of the reaction tank is provided with an electric heater.

5. The ethylene oxide sterilization waste gas purification device according to claim 1, characterized in that: The packing layer is made of plastic packing.

6. The ethylene oxide sterilization waste gas purification device according to claim 5, characterized in that: The packing height of the packing layer is 60% to 80% of the height of the absorption tower.

7. The ethylene oxide sterilization waste gas purification device according to claim 1, characterized in that: A pH meter is installed on the top of the neutralization tank, and the second dosing pump and the discharge pump are controlled by the pH meter.

8. The ethylene oxide sterilization waste gas purification device according to claim 1, characterized in that: A stirrer is installed on the top of the neutralization tank to ensure uniform concentration distribution of the solution in the tank.

9. The ethylene oxide sterilization waste gas purification device according to claim 1, characterized in that: The reaction tank and the absorption tower are both equipped with heat insulation layers.

Images