Drying oven waste gas recovery system in diaphragm industry

Abstract

The utility model relates to the technical field of oven waste gas recovery and treatment in the diaphragm industry, in particular to an oven waste gas recovery system in the diaphragm industry. Comprising a drying oven, a filter, an induced draft fan, a first-stage condenser, a second-stage condenser, a gas-liquid separator, a heater and a solvent tank, the gas outlet end of the drying oven is connected with the inlet end of the filter, the outlet end of the filter is connected with the inlet end of the induced draft fan, the outlet end of the induced draft fan is connected with the gas phase inlet end of the first-stage condenser, and the gas phase inlet end of the second-stage condenser is connected with the gas phase inlet end of the second-stage condenser. The gas phase outlet end of the primary condenser is connected with the gas phase inlet end of the secondary condenser, the gas phase outlet end of the secondary condenser is connected with the inlet end of the gas-liquid separator, the liquid phase outlet end of the gas-liquid separator is connected with the inlet end of the solvent tank, the gas phase outlet end of the gas-liquid separator is connected with the inlet end of the heater, and the liquid phase outlet end of the heater is connected with the inlet end of the solvent tank. A first gas phase outlet end of the heater is connected with an inlet end of the drying oven; the whole treatment process is energy-saving, efficient and environment-friendly.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste gas recovery and treatment of ovens in the diaphragm industry, relates to the technology of organic gas atmospheric condensation recovery, and particularly relates to a waste gas recovery system for ovens in the diaphragm industry. Background Art

[0002] With the rapid development of the diaphragm industry, the treatment of oven waste gas has become an important problem to be solved urgently in the industry. At present, the main components of oven waste gas in the diaphragm industry are methylene chloride and the concentration is relatively high. In the prior art, the activated carbon fiber adsorption condensation recovery method and the compression condensation recovery method are mainly used to treat oven waste gas. However, both of these methods have certain defects.

[0003] For the activated carbon fiber adsorption condensation recovery method, due to the particularity of the waste gas components, domestic activated carbon fibers basically cannot meet the requirements, and imported carbon fibers are generally selected in the industry, resulting in high costs. Moreover, after desorption condensation recovery, the solvent contains water and wastewater will also be generated. In addition, the service life of activated carbon is limited, generally 1 - 2 years. After replacement, it needs to be reported for hazardous waste treatment, resulting in high hazardous waste disposal costs. The compression condensation method requires a compressor, with high investment costs, high energy consumption, and complex operation.

[0004] Therefore, the existing waste gas recovery and treatment technologies for ovens in the diaphragm industry have problems such as high costs, easy generation of wastewater, high hazardous waste disposal costs, high investment costs, high energy consumption, and complex operation. There is an urgent need for a new, efficient and economical treatment technology to solve these problems. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a waste gas recovery system for ovens in the diaphragm industry, which can recover most of the organic matter, can reduce the burden on subsequent treatment devices, and does not generate wastewater and hazardous waste. The whole treatment process is energy-saving, efficient and environmentally friendly.

[0006] The technical problem of the utility model is solved by adopting the following technical solutions:

[0007] A waste gas recovery system for ovens in the diaphragm industry includes: an oven, a filter, an induced draft fan, a primary condenser, a secondary condenser, a gas-liquid separator, a heater and a solvent tank. The gas outlet end of the oven is connected to the inlet end of the filter, the outlet end of the filter is connected to the inlet end of the induced draft fan, the outlet end of the induced draft fan is connected to the gas phase inlet end of the primary condenser, the gas phase outlet end of the primary condenser is connected to the gas phase inlet end of the secondary condenser, the gas phase outlet end of the secondary condenser is connected to the inlet end of the gas-liquid separator, the liquid phase outlet end of the gas-liquid separator is connected to the inlet end of the solvent tank, the gas phase outlet end of the gas-liquid separator is connected to the inlet end of the heater, and the first gas phase outlet end of the heater is connected to the inlet end of the oven.

[0008] Moreover, an exhaust fan is also provided, and the second gas-phase outlet end of the heater is connected to the inlet end of the exhaust fan.

[0009] Moreover, the liquid-phase outlet end of the primary condenser is connected to the inlet end of the solvent tank.

[0010] Moreover, the liquid-phase outlet end of the secondary condenser is connected to the inlet end of the solvent tank.

[0011] Moreover, the primary condenser and the secondary condenser are also provided with cooling water inlets and outlets.

[0012] The advantages and positive effects of the present utility model are as follows:

[0013] By condensing the oven exhaust gas under normal pressure, the present utility model condenses dichloromethane. The content of dichloromethane in the condensed oven tail gas is relatively low. After heating, most of it returns to the oven for continuous circulation, which not only reduces energy consumption but also reduces the exhaust gas volume of the tail gas, greatly reducing the pressure of the subsequent treatment section.

[0014] The present utility model not only solves the difficulty of treating high-concentration dichloromethane waste gas in the oven exhaust gas of the diaphragm industry, but also does not produce wastewater and secondary pollution problems. It has a low preparation cost, low energy consumption, and a recovery rate of up to 60%. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the present utility model.

[0016] Reference Numerals

[0017] 1 - Filter, 2 - Induced draft fan, 3 - Primary condenser, 4 - Secondary condenser, 5 - Gas-liquid separator, 6 - Heater, 7 - Exhaust fan, 8 - Oven, 9 - Solvent tank. Detailed Embodiments

[0018] The present utility model will be further described in detail below in conjunction with the drawings and specific embodiments. The following embodiments are only descriptive and not restrictive, and cannot be used to limit the protection scope of the present utility model.

[0019] A waste gas recovery system for an oven in the diaphragm industry, comprising: an oven 8, a filter 1, a draft fan 2, a primary condenser 3, a secondary condenser 4, a gas-liquid separator 5, a heater 6 and a solvent tank 9. The gas outlet end of the oven 8 is connected to the inlet end of the filter 1, the outlet end of the filter 1 is connected to the inlet end of the draft fan 2, the outlet end of the draft fan 2 is connected to the gas-phase inlet end of the primary condenser 3, the gas-phase outlet end of the primary condenser 3 is connected to the gas-phase inlet end of the secondary condenser 4, the gas-phase outlet end of the secondary condenser 4 is connected to the inlet end of the gas-liquid separator 5, the liquid-phase outlet end of the gas-liquid separator 5 is connected to the inlet end of the solvent tank 9, the gas-phase outlet end of the gas-liquid separator 5 is connected to the inlet end of the heater 6, and the first gas-phase outlet end of the heater 6 is connected to the inlet end of the oven 8.

[0020] An exhaust fan 7 is further provided, and the second gas-phase outlet end of the heater 6 is connected to the inlet end of the exhaust fan 7.

[0021] The liquid-phase outlet end of the primary condenser 3 is connected to the inlet end of the solvent tank 9.

[0022] The liquid-phase outlet end of the secondary condenser 4 is connected to the inlet end of the solvent tank 9.

[0023] The primary condenser 3 and the secondary condenser 4 are further provided with cooling water inlets and outlets.

[0024] In the embodiment of the present utility model, the waste gas in the oven 8 is about 45°C. First, it enters the filter 1 to filter out impurities in the waste gas. Subsequently, the waste gas is pressurized by the draft fan 2 and enters the primary condenser 3, where it is pre-cooled and part of the dichloromethane is recovered. The condensed dichloromethane liquid enters the solvent tank 9 from the liquid-phase outlet of the primary condenser 3, and then enters the secondary condenser 4 for condensation. The condensed dichloroethane liquid enters the solvent tank 9 from the liquid-phase outlet of the secondary condenser 4.

[0025] Among them, the primary condenser 3 and the secondary condenser 4 are further provided with cooling water inlets and outlets, and both use 7°C low-temperature water as the cold source.

[0026] The waste gas cooled by the secondary condenser 4 will entrain some liquid droplets. After passing through the gas-liquid separator 5, the gas and liquid in the waste gas are separated. The liquid droplets converge into the solvent tank 9 from the liquid-phase outlet of the gas-liquid separator 5. The waste gas with the liquid droplets removed is heated to 45°C by the heater 6. Part of the hot dichloromethane gas returns to the oven 8 for continuous circulation, and a small part is exhausted to the subsequent treatment section through the exhaust fan 7.

[0027] Although the embodiments and drawings of the present utility model are disclosed for illustrative purposes, those skilled in the art can understand that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the present utility model and the appended claims. Therefore, the scope of the present utility model is not limited to the content disclosed in the embodiments and drawings.

Claims

1. A waste gas recovery system for an oven in the diaphragm industry, characterized in that: It includes an oven, a filter, an induced draft fan, a primary condenser, a secondary condenser, a gas-liquid separator, a heater and a solvent tank. The gas outlet end of the oven is connected to the inlet end of the filter, the outlet end of the filter is connected to the inlet end of the induced draft fan, the outlet end of the induced draft fan is connected to the gas-phase inlet end of the primary condenser, the gas-phase outlet end of the primary condenser is connected to the gas-phase inlet end of the secondary condenser, the gas-phase outlet end of the secondary condenser is connected to the inlet end of the gas-liquid separator, the liquid-phase outlet end of the gas-liquid separator is connected to the inlet end of the solvent tank, the gas-phase outlet end of the gas-liquid separator is connected to the inlet end of the heater, and the first gas-phase outlet end of the heater is connected to the inlet end of the oven.

2. The diaphragm industry oven waste gas recovery system according to claim 1, characterized in that: An exhaust fan is also provided, and the second gas-phase outlet end of the heater is connected to the inlet end of the exhaust fan.

3. The diaphragm industry oven waste gas recovery system according to claim 1, characterized in that: The liquid-phase outlet end of the primary condenser is connected to the inlet end of the solvent tank.

4. The diaphragm industry oven waste gas recovery system according to claim 1, characterized in that: The liquid-phase outlet end of the secondary condenser is connected to the inlet end of the solvent tank.

5. The diaphragm industry oven waste gas recovery system according to claim 1, characterized in that: The primary condenser and the secondary condenser are also provided with cooling water inlets and outlets.

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