Device for recovering high-concentration dimethyl sulfide from purge gas of industrial storage tank

Abstract

The utility model provides a device for recovering high-concentration dimethyl sulfide from purge gas of an industrial storage tank, which relates to the technical field of tail gas treatment and comprises a methanol washing tower condenser, a methanol washing tower, a methanol washing tower circulating pump, a water washing tower, a water washing tower circulating pump and an activated carbon adsorption box, the methanol washing tower condenser is arranged at the outlet end of the methanol washing tower circulating pump; according to the utility model, the methanol washing tower, the water washing tower and the activated carbon adsorption box are used for treating and recycling high-concentration dimethyl sulfide in the purge gas of the industrial storage tank, the methanol washing tower uses industrial methanol to absorb the dimethyl sulfide in the purge gas, and the water washing tower uses water to absorb methanol liquid drops in the purge gas behind the methanol washing tower; residual trace dimethyl sulfide and methanol are adsorbed by the activated carbon adsorption box, so that peculiar smell in the purge gas is effectively eliminated, dimethyl sulfide obtained in the methanol absorption liquid can be reused for production, the high-concentration dimethyl sulfide purge gas in an industrial storage tank area can be discharged in a standard reaching manner, the purification process is simple, and the purification effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of tail gas treatment, in particular to a device for recovering high-concentration dimethyl sulfide from the exhaust gas of an industrial storage tank. Background Art

[0002] Dimethyl sulfide (DMS) is a commonly used synthetic chemical raw material with a molecular formula of C2H6S. It is insoluble in water and toxic. In industry, methanol and hydrogen sulfide are commonly used for synthesis. Methanol and hydrogen sulfide are mixed in a certain proportion, preheated and then introduced into a catalytic reactor for reaction. The reactants are separated and dehydrated, and then distilled to obtain the finished product. Dimethyl sulfide is a solvent and is an intermediate in the production of dimethyl sulfoxide, methionine and pesticides. It can be used as a solvent for organic compounds, resins, inorganic compounds, polymerization reactions and cyanidation reactions, as an analytical reagent, polyacrylonitrile and other synthetic fibers. In the field of spinning and hydraulic oil, it can also be used as an odorizer for city gas, an industrial purifier, a paint release agent, a battery low-temperature preservative, a pesticide penetrant, etc. It is used topically in blood medicines, plant pathology and nutrients, and is used as a solvent and catalyst for most inorganic substances. Dimethyl sulfide is flammable and volatile. When the content in the air reaches 6ppm, the human sense of smell can sense a distinct sulfide odor. The standard GB14554 stipulates that the emission rate of dimethyl sulfide is 0.33-0.52kg / h, and the concentration at the factory boundary does not exceed 0.07-0.15mg / m 3 Dimethyl sulfide is volatile during production, transportation and storage, which seriously affects the safety of the surrounding environment and the health of personnel. Absorption and harmless treatment of dimethyl sulfide are important issues faced during product production, storage and transportation. Dimethyl sulfide is a typical organic sulfur malodorous gas. When its content in the air reaches one billionth, it can produce odor. Dimethyl sulfide has a low boiling point, is volatile, toxic and has a foul odor, which affects human health and environmental air quality. Inhaling air containing dimethyl sulfide for a short time can cause mental depression, anorexia or vomiting; inhaling air containing dimethyl sulfide for a long time can damage the central nervous system and blood circulation system of the human body. How to recycle it and convert it into non-toxic and odorless substances to improve the working environment and reduce the harm to people has become an important issue faced by most chemical plants.

[0003] The existing methods for treating high-concentration waste gas of dimethyl sulfide mainly include activated carbon adsorption, nitrogen oxide oxidation, nitric acid oxidation, hydrogen peroxide oxidation, sodium hypochlorite oxidation, biological treatment and the like. The activated carbon adsorption method can adsorb dimethyl sulfide onto activated carbon, which can only reduce the emission concentration and has poor effect. The hydrogen peroxide and sodium hypochlorite oxidation methods have high requirements on the component ratio and need to accurately control the ratio of hydrogen peroxide / sodium hypochlorite to dimethyl sulfide. The use of nitrogen dioxide oxidation and nitric acid oxidation to oxidize dimethyl sulfide will generate nitrogen oxides, which are an important pollution indicator in the ambient air quality standard and are prone to secondary pollution. Therefore, the utility model proposes a device for recovering high-concentration dimethyl sulfide in the vented gas of an industrial storage tank to solve the problems existing in the prior art. Utility Model Content

[0004] In view of the above problems, the utility model proposes a device for recovering high-concentration dimethyl sulfide from the purge gas of an industrial storage tank. The device for recovering high-concentration dimethyl sulfide from the purge gas of an industrial storage tank enables the high-concentration dimethyl sulfide purge gas in the industrial storage tank area to meet the emission standards, has a simple purification process and good purification effect.

[0005] To achieve the purpose of the utility model, the utility model is implemented by the following technical scheme: a device for recovering high-concentration dimethyl sulfide from the purge gas of an industrial storage tank, comprising a methanol washing tower condenser, a methanol washing tower, a methanol washing tower circulating pump, a water washing tower, a water washing tower circulating pump and an activated carbon adsorption box, wherein the methanol washing tower condenser is arranged at the outlet end of the methanol washing tower circulating pump, and the output end of the methanol washing tower circulating pump is connected to the methanol washing tower through a pipeline, the methanol washing tower circulating pump is used to cool the methanol washing liquid and send it to the methanol washing tower, the methanol washing tower air inlet end is connected to the industrial storage tank purge gas exhaust end, and the methanol washing tower air outlet end is connected to the air inlet end of the water washing tower;

[0006] The drainage end of the water washing tower is connected to the water washing tower circulation pump, and the output end of the water washing tower circulation pump is connected to the water inlet above the water washing tower through a pipeline, the air outlet end of the water washing tower is connected to the air inlet end of the activated carbon adsorption box, and the air outlet end of the activated carbon adsorption box is connected to the atmosphere.

[0007] Further improvements are: the methanol washing tower uses industrial methanol as a washing liquid to absorb high-concentration dimethyl disulfide, the water washing tower uses water as a washing liquid to absorb methanol droplets in the exhaust gas after the methanol washing tower, and the activated carbon adsorption box uses activated carbon as an adsorbent to adsorb dimethyl sulfide and methanol.

[0008] Further improvements are: a pressure sensor is provided on the inlet pipeline of the methanol washing tower, a first liquid level gauge is provided on the methanol washing tower and the water washing tower, and a dimethyl sulfide sensor is provided on the gas outlet end of the activated carbon adsorption box.

[0009] A further improvement is that: the methanol washing tower is provided with an industrial methanol supply pipeline, and the water washing tower is provided with a clean water supply pipeline.

[0010] A further improvement is that a methanol washing liquid storage device is provided at the bottom of the methanol washing tower, and a second liquid level gauge is provided on the methanol washing liquid storage device, and the bottom of the methanol washing liquid storage device is connected to the methanol washing tower circulation pump.

[0011] A further improvement is that a washing liquid storage device is provided at the bottom of the water washing tower, and a third liquid level gauge is provided on the water washing tower storage device, and the bottom of the water washing tower storage device is connected to the water washing tower circulation pump.

[0012] A further improvement is that the methanol washing tower and the water washing tower are both filled with two layers of fillers, and the fillers use corrosion-resistant ball rings, and the gas outlet ends of the methanol washing tower and the water washing tower are both provided with wire mesh demisters.

[0013] The beneficial effects of the utility model are:

[0014] 1. The utility model uses a methanol washing tower, a water washing tower, and an activated carbon adsorption box to process and recover high-concentration dimethyl sulfide in the vented gas of an industrial storage tank. The methanol washing tower uses industrial methanol to absorb dimethyl sulfide in the vented gas, the water washing tower uses water to absorb methanol droplets in the vented gas after the methanol washing tower, and the activated carbon adsorption box absorbs residual trace dimethyl sulfide and methanol, thereby effectively eliminating the odor in the vented gas. The dimethyl sulfide obtained in the methanol absorption liquid can be reused in production, so that the high-concentration dimethyl sulfide vented gas in the industrial storage tank area meets the emission standards, the purification process is simple, and the purification effect is good.

[0015] 2. The utility model uses a dimethyl sulfide sensor to monitor the concentration of dimethyl sulfide in the discharged waste gas. When the concentration reaches or exceeds the emission standard value, industrial methanol is added to the methanol washing tower. It has strong adaptability to the flow rate change and concentration change of dimethyl sulfide waste gas and can adapt to occasions with variable working conditions. The liquid level in the methanol washing tower and the water washing tower is monitored by the first liquid level meter. When the liquid level drops to the set value, industrial methanol is added to the methanol washing tower and clean water is added to the water washing tower. The automatic operation is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the front view of the utility model.

[0017] Among them: 1. Methanol washing tower condenser; 2. Methanol washing tower; 3. Methanol washing tower circulation pump; 4. Water washing tower; 5. Water washing tower circulation pump; 6. Activated carbon adsorption box. DETAILED DESCRIPTION

[0018] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with an embodiment. The embodiment is only used to explain the present invention and does not constitute a limitation on the protection scope of the present invention.

[0019] Embodiment 1

[0020] according to Figure 1 As shown, this embodiment proposes a device for recovering high-concentration dimethyl sulfide from the purge gas of an industrial storage tank, comprising a methanol washing tower condenser 1, a methanol washing tower 2, a methanol washing tower circulating pump 3, a water washing tower 4, a water washing tower circulating pump 5 and an activated carbon adsorption box 6, wherein the methanol washing tower condenser 1 is arranged at the outlet end of the methanol washing tower circulating pump 3, and the output end of the methanol washing tower circulating pump 3 is connected to the methanol washing tower 2 through a pipeline, and the methanol washing tower circulating pump 3 is used to cool the methanol washing liquid and send it into the methanol washing tower 2, the air inlet end of the methanol washing tower 2 is connected to the exhaust end of the purge gas of the industrial storage tank, and the air outlet end of the methanol washing tower 2 is connected to the air inlet end of the water washing tower 4;

[0021] The drainage end of the water washing tower 4 is connected to the water washing tower circulation pump, and the output end of the water washing tower circulation pump is connected to the water inlet above the water washing tower 4 through a pipeline, the air outlet end of the water washing tower 4 is connected to the air inlet end of the activated carbon adsorption box 6, and the air outlet end of the activated carbon adsorption box 6 is connected to the atmosphere. The methanol scrubber 2 and the water scrubber 4 are made of PP corrosion-resistant material, which effectively prolongs the service life of the purge gas treatment device. During the operation of the purge gas treatment device, in the methanol scrubber 2, industrial methanol is pumped into the industrial methanol inlet below the methanol scrubber condenser 1 through an external pump, and the industrial methanol is cooled by the methanol scrubber condenser 1, atomized through the upper liquid inlet of the methanol scrubber 2 and sprayed onto the filler, forming a uniform liquid layer on the filler surface, which is conducive to the full contact and absorption of dimethyl sulfide purge gas and industrial methanol on the filler surface; in the water scrubber 4, water is transported to the water inlet located above the water scrubber 4 through the water scrubber circulation pump 5, and the water fully infiltrates the filler, so that the purge gas entering the water scrubber 4 through the air inlet end of the water scrubber 4 can fully contact with the water and absorb the methanol droplets entrained in the purge gas. The wire mesh demisters are respectively arranged at the gas outlet ends of the methanol scrubber 2 and the water scrubber 4 to effectively remove the droplets entrained in the exhaust gas and improve the purification effect; the activated carbon adsorption box 6 adsorbs the residual trace dimethyl sulfide and methanol, thereby effectively eliminating the odor in the exhaust gas, and the methanol and dimethyl sulfide solution obtained in the methanol absorption liquid is reused in production, and the exhaust gas meets the emission standards. Among them, the methanol scrubber circulation pump 3 can make the industrial methanol scrubber liquid illusory, increase the reaction area and reaction time of the dimethyl sulfide exhaust gas sent to the methanol scrubber 2 and the industrial methanol scrubber liquid; the water scrubber circulation pump 5 is arranged on the water scrubber 4 to circulate water, and the exhaust gas purified by the methanol scrubber 2 is fully in contact with the water in the water scrubber 4, effectively absorbing the industrial methanol droplets entrained in the exhaust gas, and further purifying the exhaust gas.

[0022] The methanol washing tower 2 uses industrial methanol as a washing liquid to absorb high-concentration dimethyl disulfide. The water washing tower 4 uses water as a washing liquid to absorb methanol droplets in the exhaust gas after the methanol washing tower 2. The activated carbon adsorption box 6 uses activated carbon as an adsorbent to adsorb dimethyl sulfide and methanol.

[0023] A pressure sensor is provided on the inlet pipeline of the methanol washing tower 2, and a first liquid level gauge is provided on both the methanol washing tower 2 and the water washing tower 4. A dimethyl sulfide sensor is provided at the gas outlet end of the activated carbon adsorption box 6. An industrial methanol replenishment pipeline is provided on the methanol washing tower 2, and a clean water replenishment pipeline is provided on the water washing tower 4. A methanol washing liquid storage device is provided at the bottom of the methanol washing tower 2, and a second liquid level gauge is provided on the methanol washing liquid storage device. The bottom of the methanol washing liquid storage device is connected to the methanol washing tower circulation pump 3. A washing liquid storage device is provided at the bottom of the water washing tower 4, and a third liquid level gauge is provided on the water washing tower storage device. The bottom of the water washing tower storage device is connected to the water washing tower circulation pump 5. When in use, the pressure sensor is used to monitor the inlet pipeline pressure of the methanol washing tower 2 in real time. When the inlet pipeline pressure is monitored to be positive pressure, the methanol washing tower circulation pump 3 and the water washing tower circulation pump 5 are started. When the inlet pipeline pressure is monitored to be negative pressure, the methanol washing tower circulation pump 3 and the water washing tower circulation pump 5 are closed. The concentration of dimethyl sulfide in the exhaust gas discharged from the activated carbon adsorption box 6 is monitored by a dimethyl sulfide sensor. When the concentration reaches or exceeds the emission standard value, the industrial methanol replenishment pipeline is started to replenish industrial methanol to the methanol washing tower 2. The industrial methanol injection amount can be adjusted according to the emission situation to ensure that the emission meets the standard. The liquid level in the methanol washing tower 2 is monitored by the first liquid level gauge of the methanol washing tower 2, and the liquid level in the water washing tower 4 is monitored by the first liquid level gauge of the water washing tower 4. When the liquid level in the methanol washing tower 2 drops to the set value, the industrial methanol replenishment pipeline is started to replenish industrial methanol to the methanol washing tower 2, and when the liquid level in the water washing tower 4 drops to the set value, the clean water replenishment pipeline is started to replenish clean water to the water washing tower 4.

[0024] Embodiment 2

[0025] according to Figure 1 As shown, this embodiment proposes a device for recovering high-concentration dimethyl sulfide from the purge gas of an industrial storage tank, comprising a methanol washing tower condenser 1, a methanol washing tower 2, a methanol washing tower circulating pump 3, a water washing tower 4, a water washing tower circulating pump 5 and an activated carbon adsorption box 6, wherein the methanol washing tower condenser 1 is arranged at the outlet end of the methanol washing tower circulating pump 3, and the output end of the methanol washing tower circulating pump 3 is connected to the methanol washing tower 2 through a pipeline, and the methanol washing tower circulating pump 3 is used to cool the methanol washing liquid and send it into the methanol washing tower 2, the air inlet end of the methanol washing tower 2 is connected to the exhaust end of the purge gas of the industrial storage tank, and the air outlet end of the methanol washing tower 2 is connected to the air inlet end of the water washing tower 4;

[0026] The drainage end of the water washing tower 4 is connected to the water washing tower circulation pump, and the output end of the water washing tower circulation pump is connected to the water inlet above the water washing tower 4 through a pipeline, the air outlet end of the water washing tower 4 is connected to the air inlet end of the activated carbon adsorption box 6, and the air outlet end of the activated carbon adsorption box 6 is connected to the atmosphere. The methanol scrubber 2 and the water scrubber 4 are made of PP corrosion-resistant material, which effectively prolongs the service life of the purge gas treatment device. During the operation of the purge gas treatment device, in the methanol scrubber 2, industrial methanol is pumped into the industrial methanol inlet below the methanol scrubber condenser 1 through an external pump, and the industrial methanol is cooled by the methanol scrubber condenser 1, atomized through the upper liquid inlet of the methanol scrubber 2 and sprayed onto the filler, forming a uniform liquid layer on the filler surface, which is conducive to the full contact and absorption of dimethyl sulfide purge gas and industrial methanol on the filler surface; in the water scrubber 4, water is transported to the water inlet located above the water scrubber 4 through the water scrubber circulation pump 5, and the water fully infiltrates the filler, so that the purge gas entering the water scrubber 4 through the air inlet end of the water scrubber 4 can fully contact with the water and absorb the methanol droplets entrained in the purge gas. The wire mesh demisters are respectively arranged at the gas outlet ends of the methanol scrubber 2 and the water scrubber 4 to effectively remove the droplets entrained in the exhaust gas and improve the purification effect; the activated carbon adsorption box 6 adsorbs the residual trace dimethyl sulfide and methanol, thereby effectively eliminating the odor in the exhaust gas, and the methanol and dimethyl sulfide solution obtained in the methanol absorption liquid is reused in production, and the exhaust gas meets the emission standards. Among them, the methanol scrubber circulation pump 3 can make the industrial methanol scrubber liquid illusory, increase the reaction area and reaction time of the dimethyl sulfide exhaust gas sent to the methanol scrubber 2 and the industrial methanol scrubber liquid; the water scrubber circulation pump 5 is arranged on the water scrubber 4 to circulate water, and the exhaust gas purified by the methanol scrubber 2 is fully in contact with the water in the water scrubber 4, effectively absorbing the industrial methanol droplets entrained in the exhaust gas, and further purifying the exhaust gas.

[0027] The methanol washing tower 2 uses industrial methanol as a washing liquid to absorb high-concentration dimethyl disulfide. The water washing tower 4 uses water as a washing liquid to absorb methanol droplets in the exhaust gas after the methanol washing tower 2. The activated carbon adsorption box 6 uses activated carbon as an adsorbent to adsorb dimethyl sulfide and methanol.

[0028] The methanol washing tower 2 and the water washing tower 4 are both filled with two layers of fillers, and the fillers use corrosion-resistant ball rings, which fully purify the dimethyl sulfide purge gas. The gas outlet ends of the methanol washing tower 2 and the water washing tower 4 are both provided with wire mesh demisters. The wire mesh demisters are respectively provided at the gas outlet ends of the methanol washing tower 2 and the water washing tower 4 to effectively remove the droplets entrained in the exhaust gas and improve the purification effect.

[0029] The utility model uses a methanol washing tower 2, a water washing tower 4, and an activated carbon adsorption box 6 to process and recover high-concentration dimethyl sulfide in the purge gas of an industrial storage tank. The methanol washing tower 2 uses industrial methanol to absorb dimethyl sulfide in the purge gas, the water washing tower 4 uses water to absorb methanol droplets in the purge gas after the methanol washing tower 2, and the activated carbon adsorption box 6 absorbs residual trace dimethyl sulfide and methanol, thereby effectively eliminating the odor in the purge gas. The dimethyl sulfide obtained in the methanol absorption liquid can be reused in production, so that the high-concentration dimethyl sulfide purge gas in the industrial storage tank area meets the emission standards, the purification process is simple, and the purification effect is good. The utility model uses a dimethyl sulfide sensor to monitor the concentration of dimethyl sulfide in the discharged waste gas. When the concentration reaches or exceeds the emission standard value, industrial methanol is added to the methanol washing tower 2. The utility model has strong adaptability to the flow rate change and concentration change of the dimethyl sulfide waste gas and can adapt to occasions with variable working conditions. The liquid levels in the methanol washing tower 2 and the water washing tower 4 are monitored by the first liquid level meter. When the liquid level drops to the set value, industrial methanol is added to the methanol washing tower 2 and clean water is added to the water washing tower 4. The automatic operation is more convenient.

[0030] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A device for recovering high-concentration dimethyl sulfide from the purge gas of an industrial storage tank, comprising a methanol scrubber condenser (1), a methanol scrubber (2), a methanol scrubber circulating pump (3), a water scrubber (4), a water scrubber circulating pump (5) and an activated carbon adsorption box (6), characterized in that: The methanol washing tower condenser (1) is arranged at the outlet end of the methanol washing tower circulation pump (3), and the output end of the methanol washing tower circulation pump (3) is connected to the methanol washing tower (2) through a pipeline, and the methanol washing tower circulation pump (3) is used to cool the methanol washing liquid and then send it into the methanol washing tower (2), the air inlet end of the methanol washing tower (2) is connected to the exhaust end of the industrial storage tank purge gas, and the air outlet end of the methanol washing tower (2) is connected to the air inlet end of the water washing tower (4); The drainage end of the water scrubber (4) is connected to a water scrubber circulation pump, and the output end of the water scrubber circulation pump is connected to a water inlet above the water scrubber (4) through a pipeline, the air outlet end of the water scrubber (4) is connected to the air inlet end of the activated carbon adsorption box (6), and the air outlet end of the activated carbon adsorption box (6) is connected to the atmosphere.

2. The device for recovering high-concentration dimethyl sulfide from the purge gas of an industrial storage tank according to claim 1, characterized in that: The methanol scrubbing tower (2) uses industrial methanol as a scrubbing liquid for absorbing high-concentration dimethyl disulfide, the water scrubbing tower (4) uses water as a scrubbing liquid for absorbing methanol droplets in the exhaust gas after the methanol scrubbing tower (2), and the activated carbon adsorption box (6) uses activated carbon as an adsorbent for adsorbing dimethyl sulfide and methanol.

3. The device for recovering high-concentration dimethyl sulfide from the purge gas of an industrial storage tank according to claim 2, characterized in that: A pressure sensor is provided on the inlet pipeline of the methanol washing tower (2), a first liquid level gauge is provided on the methanol washing tower (2) and the water washing tower (4), and a dimethyl sulfide sensor is provided at the gas outlet end of the activated carbon adsorption box (6).

4. The device for recovering high-concentration dimethyl sulfide from the purge gas of an industrial storage tank according to claim 3, characterized in that: The methanol washing tower (2) is provided with an industrial methanol supply pipeline, and the water washing tower (4) is provided with a clean water supply pipeline.

5. The device for recovering high-concentration dimethyl sulfide from the purge gas of an industrial storage tank according to claim 4, characterized in that: A methanol washing liquid storage device is provided at the bottom of the methanol washing tower (2), and a second liquid level gauge is provided on the methanol washing liquid storage device. The bottom of the methanol washing liquid storage device is connected to the methanol washing tower circulation pump (3).

6. The device for recovering high-concentration dimethyl sulfide from the purge gas of an industrial storage tank according to claim 5, characterized in that: A washing liquid storage device is provided at the bottom of the water washing tower (4), and a third liquid level gauge is provided on the water washing tower storage device. The bottom of the water washing tower storage device is connected to a water washing tower circulation pump (5).

7. The device for recovering high-concentration dimethyl sulfide from the purge gas of an industrial storage tank according to claim 6, characterized in that: The methanol washing tower (2) and the water washing tower (4) are both filled with two layers of fillers, and the fillers use corrosion-resistant ball rings. The gas outlet ends of the methanol washing tower (2) and the water washing tower (4) are both provided with wire mesh demisters.

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