Dichloroethane adsorption and recovery device

Abstract

The utility model discloses a dichloroethane adsorption recovery device, which relates to the technical field of waste gas adsorption devices and comprises an adsorption kettle, a resin layer is filled in the adsorption kettle, the top of the adsorption kettle is respectively connected with a nitrogen inlet pipe, a steam inlet pipe and a waste gas outlet pipe, and the bottom of the adsorption kettle is respectively connected with a waste gas inlet pipe, a steam outlet pipe and a nitrogen outlet pipe. The waste gas outlet pipe is connected with a fan, the tail end of the waste gas outlet pipe is connected with an exhaust funnel, the tail end of the steam outlet pipe is connected with a condenser, the condenser is connected with a separator through a pipeline, the separator is connected with a recovery pipe and a sewage pipe, and a secondary adsorption pipe is connected between the condenser and the waste gas inlet pipe. According to the device, the dichloroethane is recycled, the content of the dichloroethane in the waste gas is reduced, and the standard emission of the tail gas is kept.

Description

Technical Field

[0001] This utility model relates to the technical field of waste gas adsorption devices, and in particular to a dichloroethane adsorption and recovery device. Background Technology

[0002] Dichloroethane is an organic solvent that is highly harmful to the environment and human health. Currently, acylation and dehydration processes in chemical production generate waste gas containing dichloroethane. After being scrubbed by water absorption towers and alkali absorption towers, the waste gas is discharged into the exhaust stack. However, the absorption and treatment effect of dichloroethane is poor, resulting in substandard exhaust emissions and environmental pollution. Therefore, we propose a dichloroethane adsorption and recovery device. Utility Model Content

[0003] The purpose of this invention is to provide a dichloroethane adsorption and recovery device to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A dichloroethane adsorption and recovery device includes an adsorption vessel filled with a resin layer. The top of the adsorption vessel is connected to a nitrogen inlet pipe, a steam inlet pipe, and a waste gas outlet pipe. The bottom of the adsorption vessel is also connected to a waste gas inlet pipe, a steam outlet pipe, and a nitrogen outlet pipe. A fan is connected to the waste gas outlet pipe, and an exhaust stack is connected to the end of the waste gas outlet pipe. A condenser is connected to the end of the steam outlet pipe. The condenser is connected to a separator via a pipe. The separator is connected to a recovery pipe and a wastewater pipe. A secondary adsorption pipe is connected between the condenser and the waste gas inlet pipe.

[0006] Preferably, each of the nitrogen inlet pipe, steam inlet pipe, exhaust gas outlet pipe, exhaust gas inlet pipe, steam outlet pipe, and nitrogen outlet pipe is equipped with a solenoid valve.

[0007] Preferably, the adsorption vessel is an enamel-lined reactor.

[0008] Compared with the prior art, the beneficial effects of this utility model are:

[0009] This invention utilizes a regenerable resin adsorption system. The resin filling the adsorption vessel adsorbs dichloroethane from the waste gas. Then, through steam and nitrogen pipelines, steam desorption and hot nitrogen purging activate and vaporize the adsorbed dichloroethane, desorbing it from the resin. The reactivated resin can then re-adsorb dichloroethane from the organic waste gas. Simultaneously, a condenser condenses the desorbed dichloroethane gas, which is then liquefied and automatically separated into layers with water in a separator for recovery. This invention achieves dichloroethane recycling and reuse, while reducing the dichloroethane content in the waste gas and ensuring that the exhaust gas meets emission standards. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model.

[0011] Figure Labels

[0012] 1. Adsorption vessel, 2. Resin layer, 3. Nitrogen inlet pipe, 4. Steam inlet pipe, 5. Waste gas outlet pipe, 6. Waste gas inlet pipe, 7. Steam outlet pipe, 8. Nitrogen outlet pipe, 9. Condenser, 10. Separator, 11. Recovery pipe, 12. Secondary adsorption pipe, 13. Solenoid valve, 14. Fan, 15. Exhaust stack, 16. Sewage pipe. Detailed Implementation

[0013] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0014] like Figure 1 As shown, a dichloroethane adsorption and recovery device includes an adsorption vessel 1, which is an enamel-lined reactor. The adsorption vessel 1 is filled with a resin layer 2. A nitrogen inlet pipe 3, a steam inlet pipe 4, and a waste gas outlet pipe 5 are connected to the top of the adsorption vessel 1. A waste gas inlet pipe 6, a steam outlet pipe 7, and a nitrogen outlet pipe 8 are connected to the bottom of the adsorption vessel 1. A fan 14 is connected to the waste gas outlet pipe 5, and an exhaust stack 15 is connected to the end of the waste gas outlet pipe 5. The fan 14 drives the waste gas into the adsorption vessel 1, and after being adsorbed and treated, the waste gas is discharged through the waste gas outlet pipe 5 into the exhaust stack 15.

[0015] The steam outlet pipe 7 is connected to the condenser 9 at its end. The condenser 9 is connected to the separator 10 through a pipe. The separator 10 is connected to the recovery pipe 11 and the sewage pipe 16. The dichloroethane that has been separated in the separator is discharged into the recovery storage tank for recovery through the recovery pipe 11, and the sewage is discharged into the sewage treatment system for treatment through the sewage pipe 16. A secondary adsorption pipe 12 is connected between the condenser 9 and the exhaust gas inlet pipe 6. When the condensation effect is not ideal, the non-condensable gas after condensation will return to the adsorption vessel 1 through the secondary adsorption pipe 12 for secondary adsorption to achieve the purpose of emission standards.

[0016] Solenoid valves 13 are installed on nitrogen inlet pipe 3, steam inlet pipe 4, waste gas outlet pipe 5, waste gas inlet pipe 6, steam outlet pipe 7 and nitrogen outlet pipe 8 to control the opening and closing of the pipes.

[0017] The working principle of this utility model:

[0018] When waste gas is generated during chemical production activities, it first passes through a pre-processor to remove large particles of dust (to avoid clogging the resin) before entering the waste gas inlet pipe 6. Then, the solenoid valves 13 on the waste gas inlet pipe 6 and the waste gas outlet pipe 5 are opened, while the other solenoid valves are closed. The fan 14 is started to draw the waste gas from the waste gas inlet pipe 6 into the adsorption tank 1, where it is adsorbed by the resin. The purified waste gas then enters the exhaust stack 15 through the waste gas outlet pipe 5 for discharge.

[0019] After the resin is saturated with adsorption, the solenoid valves 13 on the steam inlet pipe 4 and the steam outlet pipe 7 are opened, while the other solenoid valves are closed. Steam enters the adsorption vessel 1 through the steam inlet pipe 4 and comes into contact with the resin. During the contact with the high-temperature steam, the adsorbed dichloroethane is activated and vaporized, and is desorbed to form highly concentrated waste gas. The resin regains its activity and is regenerated. At the same time, the desorbed dichloroethane gas enters the condenser 9 through the steam outlet pipe 7 for condensation. Then, it is liquefied in the separator 10 and automatically separated from the wastewater. It is then discharged into the recovery storage tank through the recovery pipe 11 for recovery. The wastewater is discharged into the wastewater treatment system through the wastewater pipe 16 for treatment.

[0020] When the condensation effect is not ideal, the condensed non-condensable gas enters the exhaust gas inlet pipe 6 through the secondary adsorption pipe 12, and is driven by the fan 14 to return to the adsorption vessel 1 for secondary adsorption in order to meet the emission standards.

[0021] After resin regeneration is complete, close the solenoid valves 13 on the steam inlet pipe 4 and the steam outlet pipe 7, and open the solenoid valves 13 on the nitrogen inlet pipe 3 and the nitrogen outlet pipe 8. After purging and cooling with nitrogen, adsorption can continue.

[0022] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A dichloroethane adsorption and recovery device, characterized in that: The device includes an adsorption vessel filled with a resin layer. A nitrogen inlet pipe, a steam inlet pipe, and a waste gas outlet pipe are connected to the top of the adsorption vessel. A waste gas inlet pipe, a steam outlet pipe, and a nitrogen outlet pipe are connected to the bottom of the adsorption vessel. A fan is connected to the waste gas outlet pipe, and an exhaust stack is connected to the end of the waste gas outlet pipe. A condenser is connected to the end of the steam outlet pipe. A separator is connected to the condenser via a pipe. The separator is connected to a recovery pipe and a wastewater pipe. A secondary adsorption pipe is connected between the condenser and the waste gas inlet pipe.

2. The dichloroethane adsorption and recovery device according to claim 1, characterized in that: Solenoid valves are installed on the nitrogen inlet pipe, steam inlet pipe, exhaust gas outlet pipe, exhaust gas inlet pipe, steam outlet pipe, and nitrogen outlet pipe.

3. The dichloroethane adsorption and recovery device according to claim 1, characterized in that: The adsorption vessel is an enamel-lined reactor.

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