Recovery device for waste gas containing high-concentration 2-methyltetrahydrofuran

Abstract

The utility model discloses a recovery device for waste gas containing high-concentration 2-methyltetrahydrofuran, which comprises a dust remover, a resin adsorption device and an odor removal device which are sequentially connected, the resin adsorption device is further provided with a steam inlet and a steam outlet, the steam outlet is connected with a condenser, and a liquid outlet of the condenser is connected with a receiving tank. Waste gas is treated through the dust remover, the resin adsorption device and the odor removal device in sequence, particles in high-concentration 2-methyltetrahydrofuran are removed through the dust remover, and the situation that the high-concentration 2-methyltetrahydrofuran enters the resin adsorption device, and the adsorption effect cannot be achieved is prevented; the resin adsorption device is used for recycling 2-methyltetrahydrofuran in the waste gas through adsorption-desorption, so that the 2-methyltetrahydrofuran can be conveniently recycled subsequently; as the inlet gas concentration is high and the outlet gas after resin adsorption does not meet the emission requirement, the odor of the waste gas is removed after the waste gas passes through the odor removal device, so that environmental protection and controllability are realized, and the emission standard is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to a waste gas recovery device, concretely relates to a recovery device of waste gas containing high concentration 2-methyl tetrahydrofuran. BACKGROUND

[0002] At present, part of the original medicine product adopts 2-methyl tetrahydrofuran as extractant or solvent in the production process. The extractant or solvent needs to be recycled and reused, usually adopts rectification, distillation and other processes, and the gas phase after condensation recovery still has high concentration 2-methyl tetrahydrofuran due to containing non-condensable gas. Such waste gas has certain recovery value and cannot be directly discharged.

[0003] The existing treatment technology of waste gas containing solvent mainly includes activated carbon adsorption, RTO incineration and absorption tower wet capture. The activated carbon adsorption method has the problems of difficult activated carbon regeneration, high energy consumption and decreased adsorption performance after multiple uses, and needs frequent replacement. In addition, the activated carbon may have the problem of insufficient selectivity when treating some specific pollutants, and may simultaneously adsorb substances that do not need to be removed. The adsorption effect of activated carbon on 2-methyl tetrahydrofuran is poor, and the effective adsorption amount is low. The RTO incineration method has high requirements for the concentration of inlet gas, and the concentration of inlet gas cannot exceed 25% of the lower explosive limit. The waste gas is directly incinerated and treated, and cannot be effectively recycled and utilized. The method is not suitable for high-concentration waste gas with recovery value. The absorption tower wet capture method can recover part of high-concentration 2-methyl tetrahydrofuran by water absorption, but needs secondary treatment. The 2-methyl tetrahydrofuran after water absorption needs to be treated by rectification or distillation again, and the energy consumption is high.

[0004] CN202223544338.2 discloses a 2-methyl tetrahydrofuran preparation gas purification tank that avoids environmental pollution. The high-temperature steam can effectively kill most of the bacteria in the waste gas, but cannot recover and utilize high-concentration 2-methyl tetrahydrofuran waste gas. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies of the prior art, the utility model provides a recovery device of waste gas containing high-concentration 2-methyl tetrahydrofuran. The recovery device can not only fully recover 2-methyl tetrahydrofuran in the waste gas, but also fully treat the waste gas. The finally discharged waste gas has no odor and meets the emission standard.

[0006] The specific technical scheme of the utility model is as follows:

[0007] A recovery device of waste gas containing high-concentration 2-methyl tetrahydrofuran comprises a dust remover, a resin adsorption device and a deodorization device connected in sequence. The resin adsorption device is further provided with a steam inlet and a steam outlet. The steam outlet is connected with a condenser, and the liquid outlet of the condenser is connected with a receiving tank.

[0008] Further, the air outlet of the dust remover is connected with the air inlet of the resin adsorption device, and the air outlet of the resin adsorption device is connected with the air inlet of the deodorization device.

[0009] Further, the resin adsorption device is provided with macroporous adsorption resin.

[0010] Further, the steam inlet of the resin adsorption device is provided with a pressure reducing valve, and the steam enters the resin adsorption device through the pressure reducing valve.

[0011] Further, the deodorization device is connected with the deodorant feeding device.

[0012] Further, a flow meter is arranged between the deodorization device and the deodorant feeding device.

[0013] Further, the deodorization device is provided with a high-pressure atomizing nozzle, and the deodorant feeding device is provided with liquid deodorant or deodorant solution, and the deodorant or deodorant solution is sprayed into the deodorization device through the high-pressure atomizing nozzle.

[0014] Further, a feeding pump and a controller are arranged between the deodorization device and the deodorant feeding device, and the feeding pump is connected with the flow meter through the controller.

[0015] Further, a first fan is arranged between the dust remover and the resin adsorption device, and is used for maintaining the pressure in the dust remover as negative pressure.

[0016] Further, a second fan is arranged between the resin adsorption device and the deodorization device, and is used for maintaining the pressure in the resin adsorption device as negative pressure.

[0017] The utility model has the following beneficial effects:

[0018] 1, the utility model discloses a resin adsorption device to 2-methyl tetrahydrofuran carries out adsorption recovery, and the resin does not contain metal impurity, and does not cause catalytic polymerization or combustion and other hidden dangers in the waste gas adsorption process, and the resin is hydrophobic material, and there is no requirement to moisture in the operation process, can reduce adsorption heat, and the resin after adsorption saturation is desorbed by steam, and the desorption gas phase is condensed to obtain 2-methyl tetrahydrofuran by condenser, avoids the waste of resources.

[0019] 2, the utility model discloses waste gas is handled in turn through dust catcher, resin adsorption device, deodorization device, and high concentration 2-methyltetrahydrofuran removes particulate matter through dust catcher, prevents into resin adsorption device, causes the blockage of surface resin adsorption, and cannot reach adsorption effect, and resin adsorption device realizes the recovery of 2-methyltetrahydrofuran in waste gas through adsorption - analysis, and it is convenient for subsequent reuse, and because the concentration of inlet gas is high, the exhaust gas after resin adsorption is qualified for VOCs, but still has 2-methyltetrahydrofuran below 10mg / m³, has the smell of characteristic pollutant, to guarantee to reach the standard discharge, through the end deodorization device processing, removes peculiar smell, realizes environmental protection controllable, satisfies the discharge standard. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the structural schematic diagram of the utility model;

[0021] Among them, 1, dust catcher, 2, air blower, 3, resin adsorption device, 4, induced draft fan, 5, deodorization device, 6, deodorant feeding device, 7, condenser, 8, receiving tank, 9, material pump, 10, pressure reducing valve. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiments of the utility model will be described below in conjunction with the drawings in the embodiments of the utility model clearly and completely, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the scope of protection of the utility model.

[0023] Embodiment 1

[0024] As Figure 1 shown as the recovery device of the waste gas containing high concentration 2-methyltetrahydrofuran of the utility model, it includes dust catcher 1, resin adsorption device 3, deodorization device 5, deodorant feeding device 6, condenser 7, receiving tank 8. Among them, dust catcher is used to remove the particles in waste gas, so that the particulate matter index of waste gas is reduced to 5mg / m³, prevents the particulate matter from entering resin adsorption device, causes the blockage of surface resin adsorption, and cannot reach adsorption effect. The dust catcher can select the dust catcher commonly used in industry, for example, cloth bag type dust catcher. The air outlet of dust catcher is connected with the air inlet of resin adsorption device through air blower 2, and the main function of air blower is to overcome the pressure loss of dust catcher and pipeline, maintain the pressure in dust catcher as micro negative pressure, odor does not spread to the outside, and ensure that waste gas effectively enters resin adsorption device.

[0025] The resin adsorption device is at least one, preferably two or more in view of the practicability of the device. In this way, when the resin in one device is saturated, it can be replaced by other resin adsorption devices. The resin adsorption device is provided with an air inlet, an air outlet, a steam inlet and a steam outlet, wherein the air inlet and the air outlet are oppositely arranged, and the steam inlet and the steam outlet are oppositely arranged. The resin adsorption device can be selected from the resin adsorption device for industrial waste gas absorption, which can be directly purchased from the market. Its structure generally includes a shell, and the shell contains a resin column or a resin bed for adsorbing substances in waste gas. In the resin adsorption device of the utility model, the resin used is macroporous adsorption resin, such as LCV-16, LXQ-10, GC-15, etc. After the waste gas is adsorbed by the macroporous adsorption resin, the removal efficiency of 2-methyltetrahydrofuran can be as high as 99% or above. The steam inlet of the resin adsorption device is connected with a steam pipeline. Since the resin adsorption device is not a pressure vessel, a pressure reducing valve 10 is arranged on the steam pipeline to reduce the pressure of the water vapor. The steam enters the resin adsorption device after being reduced to below 0.1 MPa by the pressure reducing valve. The steam outlet of the resin adsorption device is connected with a condenser, and the condenser is connected with a receiving tank. During use, the adsorption condition of the resin adsorption device is detected regularly. When the resin is saturated, the desorption and analysis of the saturated resin are carried out by passing the reduced water vapor in the steam pipeline into the resin adsorption device. The time is about 1 h. The desorbed organic substance 2-methyltetrahydrofuran enters the condenser with the steam, and then enters the receiving tank after being condensed. It is transferred out by a transfer pump 9 for reuse. The analyzed resin adsorption device can be used for adsorbing waste gas again. The condenser is a commonly used condenser in the prior art, which is provided with a condensate inlet and a condensate outlet. The condensate used in the condenser is water at 0-10℃.

[0026] Further, the air outlet of the resin adsorption device is connected to the air inlet of the odor removal device through an air induction fan 4. The main function of the air induction fan is to overcome the pressure loss of the resin adsorption device and ensure that the resin adsorption device is in a micro-negative pressure state to prevent odor diffusion, and the negative pressure is within 100 pa. The concentration of waste gas after being adsorbed by the resin adsorption device is low, and VOCs is qualified, but because the concentration of 2-methyltetrahydrofuran in the waste gas is high, there is still 2-methyltetrahydrofuran below 10 mg / m³ in the waste gas after being adsorbed by the resin adsorption device. 2-methyltetrahydrofuran has a low odor threshold and a characteristic pollutant odor, so it needs to be further treated in the odor removal device. The odor removal device is a hollow structure, and the lower part is provided with an air inlet, and the top is provided with at least one high-pressure atomizing nozzle, and the high-pressure atomizing nozzle is connected with the odor removal agent feeding device through a pipeline, and the odor removal agent feeding device can be a simple hollow structure, which is filled with an odor removal agent solution, and a flow meter 11 is arranged on the pipeline between the high-pressure atomizing nozzle and the odor removal agent feeding device to control the addition amount of the odor removal agent solution. The odor removal agent solution can be added manually or automatically to ensure that the odor of the outlet gas is controlled. Automatic feeding can be achieved in the following ways: for example, a feeding pump and a controller can also be arranged on the pipeline between the high-pressure atomizing nozzle and the odor removal agent feeding device, and the feeding pump and the flow meter are connected through the controller to realize automatic feeding. For another example, a feeding device with automatic feeding function can also be directly purchased to realize automatic feeding.

[0027] Further, the odor removal agent is in a liquid state or a solid state that can be dissolved in water. The odor removal agent or the mixture of the odor removal agent and water is added to the odor removal agent feeding device, and then atomized through the high-pressure atomizing nozzle, and then sprayed from the top into the odor removal device to contact with the waste gas entering from the air inlet at the lower part of the odor removal device, so as to further remove the odor of the waste gas. The waste gas discharged from the odor removal device has no odor, and the concentration of VOCs is lower than 60 mg / m³, which meets the emission standard and can be directly discharged.

[0028] Further, the odor removal agent can be directly purchased from the market, such as DK Sorb series odor removal agents of Qingdao Dikun Environmental Protection Technology Co., Ltd., Ka and X3 series odor removal agents of Shanghai Jisai Environmental Protection Co., Ltd.

[0029] Embodiment 2

[0030] The working process of the waste gas recovery device containing high-concentration 2-methyltetrahydrofuran is as follows:

[0031] 1. Open the odor removal agent feeding device 6, and prepare the medicament according to the set proportion; after the preparation of the medicament is completed, open the flow meter 11;

[0032] 2. Open the resin adsorption device 3, so that the set resin adsorption column is in an air inlet adsorption state;

[0033] 3. Start the dust remover 1, open the induced draft fan 4 and the air supply fan 2, and start the air intake for treatment;

[0034] 4. Adjust the amount of deodorizing agent of the deodorizing device 5 in time according to the odor of the air outlet;

[0035] 5. If the pressure difference of the dust remover 1 reaches the set value, manual cleaning is needed; during the operation of the dust remover 1, the automatic pulse vibration automatically cleans the cloth bag and collects the dust in time;

[0036] 6. When the resin column of the resin adsorption device 3 reaches the adsorption period, change to another adsorption column; the saturated resin column of the adsorption method is treated by desorption and analysis through the opening of the pressure reducing valve 10; the analyzed gas is condensed by the condenser 7, the condensed liquid enters the receiving tank 8, and is transferred out by the transfer pump 9 for reuse.

[0037] Finally, it needs to be pointed out that the above description is only the preferred embodiment of the present application, and those skilled in the art can make various similar expressions under the inspiration of the present application without violating the purpose and claims of the present application, and such changes fall within the protection scope of the present application.

Claims

1. A device for recovering waste gas containing a high concentration of 2-methyltetrahydrofuran, characterized in that: The device includes a dust collector, a resin adsorption device, and a deodorizing device connected in sequence. The resin adsorption device has an air inlet, an air outlet, a steam inlet, and a steam outlet, with the air inlet and outlet facing each other, and the steam inlet and outlet facing each other. The air outlet of the dust collector is connected to the air inlet of the resin adsorption device, and the air outlet of the resin adsorption device is connected to the air inlet of the deodorizing device. The steam outlet of the resin adsorption device is connected to a condenser, and the liquid outlet of the condenser is connected to a receiving tank. The deodorizing device is connected to a deodorizing agent feeding device, which is equipped with a high-pressure atomizing nozzle. The deodorizing agent feeding device contains liquid deodorizing agent or deodorizing agent solution, which is sprayed into the deodorizing device through the high-pressure atomizing nozzle.

2. The recycling device according to claim 1, characterized in that: The resin adsorption device is equipped with macroporous adsorption resin.

3. The recycling device according to claim 1 or 2, characterized in that: The resin adsorption device is equipped with a pressure reducing valve at the steam inlet, through which steam enters the resin adsorption device.

4. The recycling device according to claim 1, characterized in that: A flow meter is installed between the deodorizing device and the deodorizing agent feeding device.

5. The recycling device according to claim 4, characterized in that: A feeding pump and a controller are provided between the deodorizing device and the deodorizing agent feeding device. The feeding pump is interlocked with the flow meter through the controller.

6. The recycling device according to claim 1, characterized in that: A first fan is provided between the dust collector and the resin adsorption device to maintain the pressure inside the dust collector at a negative pressure.

7. The recycling device according to claim 1, characterized in that: A second fan is provided between the resin adsorption device and the deodorization device to maintain the pressure inside the resin adsorption device at a negative pressure.

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