Phthalic anhydride tail gas washing device

Abstract

The utility model provides a phthalic anhydride tail gas washing device which comprises a washing tower, a liquid storage layer, a filtering layer, an adsorption layer and a spraying layer are sequentially arranged in the washing tower from bottom to top, a demisting plate is arranged on the upper portion of the washing tower, and a storage tank used for storing washing liquid is arranged on the outer side wall of the washing tower. A flow division pipe communicated with the storage tank is arranged on the outer side wall of the storage tank, a gas guide pipeline communicated with the side wall of the washing tower is arranged on the outer side wall of the washing tower located on the outer side of the spraying layer, a plurality of spraying pipes communicated with the flow division pipe are arranged on the upper portion of the gas guide pipeline, and flow guide pipes communicated with the flow division pipe are arranged on the upper portions of the spraying pipes; according to the utility model, harmful gas in waste gas can be washed, absorbed and cleaned through washing liquid sprayed by the spraying pipe in the washing tower, and liquid drops in gas flow can be removed through the demisting plate, so that the washing efficiency of the waste gas is greatly improved, and secondary pollution is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of tail gas washing equipment, in particular to a phthalic anhydride tail gas washing device. Background Art

[0002] Currently, the main treatment methods for phthalic anhydride tail gas are to oxidize organic matter in the tail gas using thermal storage oxidation systems or catalytic oxidation systems, recover waste heat from the tail gas using boilers, remove SO2 using wet desulfurization, remove dust using wet electrostatic precipitators, and eliminate white plume from the tail gas after electrostatic precipitators using white plume elimination systems. After oxidation removal and waste heat recovery, the flue gas contains SO2, SO3, HF, HCl, and non-methane hydrocarbons.

[0003] Traditional scrubbers are inefficient in cleaning harmful gases from exhaust gas and can easily lead to secondary pollution of the exhaust gas due to insufficient scrubbing. Utility Model Content

[0004] In view of this, the utility model provides a phthalic anhydride tail gas washing device, which can realize the efficient, rapid and complete cleaning of harmful gases in the exhaust gas through the cooperation of a washing tower and a demister plate, solving the problem that traditional washing towers are inefficient in the process of cleaning harmful gases in the exhaust gas, and it is easy to cause secondary pollution of the exhaust gas due to insufficient washing.

[0005] In order to solve the above technical problems, the utility model provides a phthalic anhydride tail gas washing device, comprising a washing tower, wherein the interior of the washing tower is sequentially provided with a liquid storage layer, a filtering layer, an adsorption layer and a spray layer from bottom to top, a demister plate is provided on the upper part of the washing tower, a storage tank for storing water washing liquid is provided on the outer wall of the washing tower, a diversion pipe connected to the storage tank is provided on the outer wall of the storage tank, an air guide pipe intersecting the side wall of the washing tower is provided on the outer wall of the washing tower outside the spray layer, a plurality of spray pipes connected to the diversion pipe are provided on the upper part of the air guide pipe, and a diversion pipe connected to the diversion pipe is provided on the upper part of the plurality of spray pipes. The utility model can wash, absorb and clean the harmful gases in the exhaust gas through the washing liquid sprayed from the spray pipe in the washing tower, and remove the droplets in the air flow through the demister plate to avoid secondary pollution, thereby solving the problem that the traditional washing tower is inefficient in the process of cleaning the harmful gases in the exhaust gas, and it is easy to cause secondary pollution of the exhaust gas due to insufficient washing.

[0006] The air inlet end of the air duct is connected to the discharge end of the emission source, a plurality of first switch valves are provided on the diversion pipe, and a second switch valve is provided on the spray pipe. The utility model can control the circulation and closing of the washing liquid flowing into the diversion pipe through the first switch valve, and control the opening and closing of the spray pipe through the second switch control valve, which is more convenient to operate.

[0007] A sealing cover is provided on the upper part of the storage tank, and a handle is provided on the sealing cover. The utility model can effectively seal the storage tank through the sealing cover to prevent the washing liquid in the storage tank from being contaminated. The handle makes it easy for the operator to extract, open and install the sealing cover, making the operation more convenient.

[0008] A pressure regulating valve is provided on the guide pipe. The utility model can control the pressure of the washing liquid sprayed from the spray pipe through the pressure regulating valve, and can conveniently and quickly adjust the spray pressure of the spray pipe according to the rate of the exhaust gas introduced, making the operation more convenient.

[0009] A plurality of transparent observation windows are provided on the side wall of the washing tower. The utility model can check the exhaust gas cleaning status in the washing tower in real time through the transparent observation windows, which makes the operation more convenient.

[0010] The bottom of the washing tower is evenly provided with a plurality of supporting legs. The utility model can firmly support and fix the washing tower through the supporting legs, thereby greatly increasing the stability of the washing tower.

[0011] In summary, compared with the prior art, this application has at least one of the following beneficial technical effects:

[0012] 1. The utility model can wash, absorb and clean harmful gases in the exhaust gas through the washing liquid sprayed from the spray pipe in the washing tower, and remove droplets in the air flow through the demister plate to avoid secondary pollution. It solves the problem that traditional washing towers are inefficient in cleaning harmful gases in the exhaust gas and are prone to secondary pollution of the exhaust gas due to insufficient washing.

[0013] 2. The utility model can control the circulation and closing of the washing liquid flowing into the shunt pipe through the first switch valve, and control the opening and closing of the spray pipe through the second switch control valve, which is more convenient to operate.

[0014] 3. The utility model can achieve effective sealing of the storage tank through the sealing cover to prevent the washing liquid in the storage tank from being contaminated, and the handle makes it easy for the operator to extract, open and install the sealing cover, making the operation more convenient.

[0015] 4. The utility model can achieve effective sealing of the storage tank through the sealing cover to prevent the washing liquid in the storage tank from being contaminated, and the handle makes it easy for the operator to extract, open and install the sealing cover, making the operation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of a phthalic anhydride tail gas scrubbing device according to the present invention;

[0017] Figure 2 This is a top view of the phthalic anhydride tail gas scrubbing device of the utility model;

[0018] Figure 3 For this utility model Figure 2 Sectional view at AA in the figure.

[0019] Explanation of the accompanying reference numerals: 100, washing tower; 101, liquid storage layer; 102, filtration layer; 103, adsorption layer; 104, spray layer; 105, demisting plate; 106, transparent observation window; 107, support leg; 200, storage tank; 300, diversion pipe; 400, air guide duct; 500, spray pipe; 600, guide pipe; 700, first switch valve; 800, second switch valve; 900, sealing cover. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiment of the present invention clearer, the following will be combined with the appended drawings of the embodiment of the present invention. Figure 1-3 , clearly and completely describing the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field fall within the scope of protection of the present invention.

[0021] like Figure 1-3As shown: This embodiment provides a phthalic anhydride tail gas washing device, including a washing tower 100, the interior of the washing tower 100 is sequentially provided with a liquid storage layer 101, a filter layer 102, an adsorption layer 103 and a spray layer 104 from bottom to top, the adsorption layer 103 is an activated carbon layer, the filter layer 102 is a honeycomb activated carbon filter cotton plate, the liquid storage layer 101 is an alkaline or acidic solution, the upper part of the washing tower 100 is provided with a demister plate 105, the demister plate 105 is a wire mesh demister or a fiber demister, a storage tank 200 for storing water washing liquid is provided on the outer wall of the washing tower 100, when the storage tank 200 stores an acidic solution, the liquid storage layer 101 is an alkaline solution, conversely, when the storage tank 200 stores an alkaline solution, the liquid storage layer 101 is an acidic solution, the outer wall of the storage tank 200 is provided with a diversion pipe 300 connected thereto, located at the spray An air guide duct 400 that is connected to the side wall of the washing tower 100 is provided on the outer wall of the washing tower 100 outside the layer 104, and a plurality of spray pipes 500 that are connected to the diversion pipe 300 are provided on the upper part of the air guide duct 400. The spray pipe 500 is provided with a spray shower on the side of the air guide duct 400. The upper part of the plurality of spray pipes 500 is provided with a guide pipe 600 that is connected to the diversion pipe 300. The utility model can use the washing liquid sprayed by the spray pipe 500 in the washing tower 100 to wash, absorb and clean the harmful gas in the exhaust gas, and remove the droplets in the air flow through the demister plate 105 to avoid secondary pollution, thereby solving the problem that the traditional washing tower 100 is inefficient in cleaning the harmful gas in the exhaust gas, and it is easy to cause secondary pollution of the exhaust gas due to insufficient washing.

[0022] According to one embodiment of the present invention, Figure 1-3 As shown, the air inlet end of the air duct 400 is connected to the discharge end of the emission source, a plurality of first switch valves 700 are provided on the diversion pipe 300, and a second switch valve 800 is provided on the spray pipe 500. The first switch valve 700 and the second switch valve 800 are both manual switch water valves. The utility model can control the circulation and closing of the washing liquid flowing into the diversion pipe 300 through the first switch valve 700, and control the opening and closing of the spray pipe 500 through the second switch control valve, which is more convenient to operate.

[0023] A sealing cover 900 is provided on the upper part of the storage tank 200, and a handle is provided on the sealing cover 900. The utility model can effectively seal the storage tank 200 through the sealing cover 900 to prevent the washing liquid in the storage tank 200 from being contaminated, and the handle makes it easy for the operator to extract, open and install the sealing cover 900, making the operation more convenient.

[0024] According to another embodiment of the present invention, Figure 1 and Figure 2As shown, a pressure regulating valve is provided on the guide pipe 600, and the pressure regulating valve position flow valve. The utility model can control the pressure of the washing liquid sprayed from the spray pipe 500 through the pressure regulating valve, and can adjust the injection pressure of the spray pipe 500 conveniently and quickly according to the rate of the incoming exhaust gas, which is more convenient to operate.

[0025] According to another embodiment of the present invention, Figure 1 and Figure 3 As shown, a plurality of transparent observation windows 106 are provided on the side wall of the washing tower 100. The transparent observation windows 106 should be made of light-transmitting tempered glass. The present invention can view the exhaust gas cleaning status in the washing tower 100 in real time through the transparent observation windows 106, making operation more convenient.

[0026] A plurality of legs 107 are evenly distributed on the bottom of the washing tower 100 . The utility model can firmly support and fix the washing tower 100 through the legs 107 , thereby greatly increasing the stability of the washing tower 100 .

[0027] The use method of this utility model:

[0028] First of all, it should be made clear that the washing device involved in the present invention is mainly used for gas washing operations. The present invention takes the washing of phthalic anhydride tail gas as an example to explain its method of use in detail. When it is necessary to wash the phthalic anhydride tail gas, first connect the discharge end of the emission source with the air inlet end box of the air guide pipe 400, then open the first switch control valve on the diversion pipe 300, turn on the water pump, turn on the second switch control valve on the spray pipe 500, and adjust the pressure of the pressure control valve to an appropriate level. In this process, the high-pressure exhaust gas entering through the air inlet end of the air guide pipe 400 will react with the washing liquid sprayed out from the spray pipe 500, and the harmful substances will be absorbed and converted into water-soluble salts or liquid forms and sprayed into the washing tower 100. The liquid harmful gas passing through the inside of the washing tower 100 will be discharged according to its own gravity. The waste gas passes through the adsorption layer 103, the filtration layer 102 and the liquid storage layer 101 downward for the second time. After the adsorption by the adsorption layer 103 and the filtration by the filtration layer 102, the water-soluble substances will eventually remain in the liquid storage layer. The other safe waste gas will be discharged upward to the demister plate 105 after the secondary adsorption and cleaning by the liquid storage layer 101. The demister plate 105 removes and cleans the droplets in the safe waste gas and then discharges it. The utility model can use the washing liquid sprayed by the spray pipe 500 in the washing tower 100 to wash, absorb and clean the harmful gas in the waste gas, and remove the droplets in the airflow through the demister plate 105 to avoid secondary pollution, thereby solving the problem that the traditional washing tower 100 is inefficient in cleaning the harmful gas in the waste gas, and it is easy to cause secondary pollution of the waste gas due to insufficient washing.

[0029] Furthermore, it should be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0030] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A phthalic anhydride tail gas scrubbing device, comprising a scrubbing tower (100), characterized in that: The interior of the washing tower (100) is provided with a liquid storage layer (101), a filtration layer (102), an adsorption layer (103) and a spray layer (104) in sequence from bottom to top; a demister plate (105) is provided on the upper portion of the washing tower (100); a storage tank (200) for storing washing liquid is provided on the outer wall of the washing tower (100); a diversion pipe (300) connected thereto is provided on the outer wall of the storage tank (200); an air guide pipe (400) connected to the side wall of the washing tower (100) is provided on the outer wall of the washing tower (100) outside the spray layer (104); a plurality of spray pipes (500) connected to the diversion pipe (300) are provided on the upper portion of the plurality of spray pipes (500); and a guide pipe (600) connected to the diversion pipe (300) is provided on the upper portion of the plurality of spray pipes (500).

2. The phthalic anhydride tail gas scrubbing device according to claim 1, wherein: The air inlet end of the air guide pipe (400) is connected to the discharge end of the discharge source, a plurality of first switch valves (700) are provided on the diversion pipe (300), and a second switch valve (800) is provided on the spray pipe (500).

3. The phthalic anhydride tail gas scrubbing device according to claim 2, wherein: A sealing cover (900) is provided on the upper portion of the storage tank (200), and a handle is provided on the sealing cover (900).

4. The phthalic anhydride tail gas scrubbing device according to claim 3, wherein: The flow guide pipe (600) is provided with a pressure regulating valve.

5. The phthalic anhydride tail gas scrubbing device according to claim 4, characterized in that: A plurality of transparent observation windows (106) are provided on the side wall of the washing tower (100).

6. The phthalic anhydride tail gas scrubbing device according to claim 5, characterized in that: A plurality of supporting legs (107) are evenly distributed on the bottom of the washing tower (100).

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