CN211216107U - Purification device for phosphoric acid activated tail gas - Google Patents

Abstract

The purifying device for phosphoric acid activating tail gas is an assembly formed from cooling equipment, direct-current high-voltage supply device and high-voltage electrostatic purifying equipment. The high-voltage electrostatic purification equipment consists of a shell, an electrostatic anode screen plate, an electrostatic cathode screen plate, a direct-current high-voltage power supply binding post, a net-shaped ball body, a purified tail gas outlet, a recovered phosphoric acid liquid outlet and a phosphoric acid tail gas inlet. A phosphoric acid tail gas inlet and a purified tail gas outlet are arranged at two ends of the high-voltage electrostatic purification equipment, a recovered phosphoric acid liquid discharge port is arranged at the bottom of the middle of the high-voltage electrostatic purification equipment, an electrostatic positive electrode screen plate and an electrostatic negative electrode screen plate are alternately arranged in a shell of the high-voltage electrostatic purification equipment at proper intervals, and the electrostatic positive electrode screen plate is welded on a stainless steel plate and is connected with the positive electrode of a direct-current high-voltage power supply binding post; the electrostatic negative screen plate is welded on the other stainless steel plate and is connected with the negative electrode of the direct-current high-voltage power supply binding post; and reticular spheres made of stainless steel wire meshes are uniformly distributed on the electrostatic anode screen plate and the electrostatic cathode screen plate.

Description

Purification device for phosphoric acid activated tail gas

One, the technical field

The utility model relates to a chemical process system activated carbon's equipment, especially a purifier of phosphoric acid activation tail gas.

Second, background Art

The method for producing the powdery active carbon by using the wood chips as the raw materials through the phosphoric acid activation method has the characteristics of developed mesopore and micropore structures, large specific surface area, rich various active groups on the surface, strong adaptability of products, wide application field and the like, and is more suitable for the fields of decoloring and refining liquid phases in the production process of foods such as monosodium glutamate, citric acid, glucose and the like. However, in the process of activated carbon production by the phosphoric acid activation method, metaphosphoric acid, pyrophosphoric acid, phosphorus oxides and the like are generated in a gaseous state along with the activated tail gas and directly discharged into the atmosphere through a chimney, so that air pollution is caused, and phosphorus compounds are discharged into the atmosphere along with the activated tail gas, so that the consumption of phosphoric acid is increased, and the production cost is increased. In order to protect the atmospheric environment, recover the phosphorus-containing compounds in the activated tail gas, reduce the consumption of phosphoric acid in unit activated carbon product, and reduce the production cost of activated carbon, a high-efficiency activated tail gas purification treatment device is very needed, and similar patent reports exist at present, such as the patent with the application number of 201320224125.3, "an activated tail gas purification treatment device for preparing activated carbon by a chemical method", which is characterized in that the tail gas is activated by spraying water, so that the activated tail gas and an absorption liquid are in full contact in gaps of a wire mesh corrugated packing, the purpose of converting the phosphorus-containing compounds in the tail gas into phosphoric acid is realized, and the defect of incomplete purification exists. Based on the above background, the utility model discloses a purifier of phosphoric acid activation tail gas.

Third, the contents of the utility model

The utility model relates to a purification device for phosphoric acid activation tail gas, which is an assembly consisting of a cooling device, a direct-current high-voltage supply device and a high-voltage electrostatic purification device. Wherein the cooling equipment is a tube heat exchanger; the direct-current high-voltage supplier is equipment for converting a 220V alternating-current power supply into a direct-current power supply, an input power supply of the direct-current high-voltage supplier is alternating current, an output of the direct-current high-voltage supplier is high-voltage direct current, and a positive electrode and a negative electrode of the high-voltage power supply are provided for high-voltage electrostatic purification equipment; the high-voltage electrostatic purification equipment consists of a shell 5, an electrostatic anode screen 6, an electrostatic cathode screen 7, a direct-current high-voltage power supply binding post 8, a reticular sphere 9, a purified tail gas outlet 10, a recovered phosphoric acid liquid outlet 11 and a cooled phosphoric acid tail gas inlet 12. A cooled phosphoric acid tail gas inlet 12 and a purified tail gas outlet 10 are arranged at two ends of a high-voltage electrostatic purification device, a recovered phosphoric acid liquid discharge port 11 is arranged at the middle bottom of the high-voltage electrostatic purification device, a high-voltage electrostatic purification device shell is made of glass fiber reinforced plastics, an electrostatic anode screen plate 6 and an electrostatic cathode screen plate 7 are alternately arranged in the high-voltage electrostatic purification device shell at proper intervals, the electrostatic anode screen plate and the electrostatic cathode screen plate are both made of 316L stainless steel wire meshes, and the electrostatic anode screen plate is welded on one stainless steel plate and is connected with the anode of a direct-current high-voltage power supply binding post; the electrostatic negative screen plate is welded on the other stainless steel plate and is connected with the negative electrode of the direct-current high-voltage power supply binding post; the electrostatic anode screen plate and the electrostatic cathode screen plate are respectively and uniformly provided with reticular spheres 9 made of stainless steel wire meshes with proper diameters according to proper intervals so as to increase the contact area with the tail gas to be purified and improve the purification effect.

Description of the drawings

Fig. 1 is a schematic diagram of a purification apparatus for phosphoric acid activated tail gas according to the present invention, in which 1 is a tubular heat exchanger, 2 is a connecting pipe, 3 is a high-voltage electrostatic purification apparatus, and 4 is a dc high-voltage supply; fig. 2 is a sectional elevation view of the high-voltage electrostatic purification apparatus shown in fig. 1, wherein fig. 5 is a sectional elevation view of a casing of the high-voltage electrostatic purification apparatus, fig. 6 is an electrostatic anode screen, fig. 7 is an electrostatic cathode screen, fig. 8 is a direct-current high-voltage power supply terminal, fig. 9 is a net-shaped sphere, fig. 10 is a purified tail gas outlet, fig. 11 is a recovered phosphoric acid solution outlet, and fig. 12 is a cooled phosphoric acid tail gas inlet; fig. 3 is a top sectional view of the high voltage electrostatic cleaning apparatus of fig. 1, the components being as described above.

Fifth, detailed description of the invention

The purification device for the phosphoric acid activated tail gas carries out purification operation like this: firstly, guiding the activated tail gas of the phosphoric acid activation furnace into a tubular heat exchanger 1 for cooling, condensing the water vapor and the phosphorus-containing compound in the activated tail gas into phosphoric acid liquid, and primarily reducing the concentration of the phosphorus-containing compound in the tail gas. Then, the direct-current high-voltage supply device 4 is started to enable the electrostatic positive screen plate and the electrostatic negative screen plate in the high-voltage electrostatic purification equipment to generate high-voltage static electricity, the non-condensable gas at the outlet of the tubular heat exchanger 1 is guided into the high-voltage electrostatic purification equipment 3, the non-condensable gas is ionized to generate positive particles and negative particles under the action of the high-voltage electrostatic field, the positive particles and the negative particles are respectively attracted and gathered to the negative screen plate, the positive screen plate and the corresponding mesh spheres to form phosphoric acid liquid drops to fall off, the phosphoric acid liquid drops are discharged from a phosphoric acid liquid discharge port 11 to be recycled, and the purified clean gas is discharged from a purified tail gas outlet 10 and guided to a discharge chimney to be evacuated, so that the purification operation of phosphoric acid activated tail gas is completed, the concentration of phosphorus-containing compounds in the discharged waste gas is greatly reduced, the adverse effect of the.

Claims (1)

1. A purification device for phosphoric acid activation tail gas is characterized in that: the purifying device is a combination body consisting of cooling equipment, a direct-current high-voltage supplier and high-voltage electrostatic purifying equipment, wherein the cooling equipment is a tube heat exchanger; the high-voltage electrostatic purification equipment consists of a shell (5), an electrostatic anode screen plate (6), an electrostatic cathode screen plate (7), a direct-current high-voltage power supply binding post (8), a reticular sphere (9), a purified tail gas outlet (10), a recovered phosphoric acid liquid outlet (11) and a cooled phosphoric acid tail gas inlet (12); a cooled phosphoric acid tail gas inlet (12) and a purified tail gas outlet (10) are arranged at two ends of high-voltage electrostatic purification equipment, a recovered phosphoric acid liquid discharge port (11) is arranged at the bottom of the middle of the high-voltage electrostatic purification equipment, a high-voltage electrostatic purification equipment shell is made of glass fiber reinforced plastics, an electrostatic positive screen plate (6) and an electrostatic negative screen plate (7) are alternately arranged in the high-voltage electrostatic purification equipment shell at proper intervals, the electrostatic positive screen plate and the electrostatic negative screen plate are both made of stainless steel wire meshes, and the electrostatic positive screen plate is welded on one stainless steel plate and is connected with the positive electrode of a direct-current high-voltage power supply binding post; the electrostatic negative screen plate is welded on the other stainless steel plate and is connected with the negative electrode of the direct-current high-voltage power supply binding post; reticular spheres (9) made of stainless steel wire meshes with proper diameters are uniformly distributed on the electrostatic anode screen plate and the electrostatic cathode screen plate according to proper intervals so as to increase the contact area with the tail gas to be purified.

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