Burning flue gas treatment device for yellow phosphorus tail gas

Abstract

The utility model discloses a yellow phosphorus tail gas combustion flue gas treatment device which comprises a filtering unit, a spraying unit, a gas washing unit and a purifying unit, electric control components in each unit are connected and controlled by a control system in a workshop, the filtering unit comprises a filtering tank and a supporting seat, the spraying unit comprises a spraying tower and an alkali liquor tank, and the spraying tower is connected with the supporting seat. The gas washing unit comprises a gas washing tower, a circulating water tower and a water storage tower; the filter unit, the spray unit, the gas washing unit and the purification unit are combined for use, so that after flue gas generated after combustion of yellow phosphorus tail gas is subjected to primary filtration, secondary spray desulfurization, tertiary gas washing, quaternary purification and quaternary procedure treatment, the discharged flue gas cannot cause pollution to the environment, and the emission requirement can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of phosphorus chemical equipment, in particular to a combustion flue gas treatment device for yellow phosphorus tail gas. Background Art

[0002] Yellow phosphorus generally refers to white phosphorus, which is a single substance of phosphorus with the chemical formula P4. It is a white or light yellow translucent solid. It is soft, brittle when cold, and darkens in light. When exposed to air, it produces green phosphorescence and white smoke in the dark. It ignites at about 40°C in humid air and slightly higher in dry air.

[0003] my country has become a major producer of yellow phosphorus in the world. Yellow phosphorus tail gas emissions produce pollution. If these yellow phosphorus tail gas are used as energy, the use of coal can be saved, while reducing emission pollution, which has high economic and social benefits.

[0004] At present, in order to save the thermal energy of high-temperature yellow phosphorus tail gas, production units often use the yellow phosphorus tail gas generated by electric furnaces as boiler fuel gas. The usual practice is to desulfurize the tail gas generated by the yellow phosphorus electric furnace to reduce the corrosive substances mixed in the gas, and then carry out low-nitrogen combustion. The high-temperature gas after the tail gas combustion is directly introduced into the boiler, and cold water exchanges heat with the high-temperature gas in the boiler and converts it into hot steam. Although the gas has been desulfurized, a large amount of flue gas will be generated during the combustion of the yellow phosphorus tail gas. The flue gas also contains sulfides, nitrogen oxides and other substances. Direct discharge will cause pollution to the environment and cannot meet environmental protection needs. Summary of the invention

[0005] In order to solve the above problems, the utility model provides a yellow phosphorus tail gas combustion flue gas treatment device which can purify the flue gas generated by the yellow phosphorus tail gas combustion boiler to meet environmental protection requirements.

[0006] In order to solve the above problems, the utility model adopts the following technical solution: a combustion flue gas treatment device for yellow phosphorus tail gas, including a filtering unit, a spraying unit, a washing unit and a purification unit, and the electrical control components in each unit are connected and controlled by a control system in a workshop.

[0007] The filter unit includes a filter tank and a support seat. The support seat is composed of two support plates, one above and one below, which are connected by a support rod, and the top surface of the upper support seat is provided with a placement groove that matches the shape of the bottom surface of the filter tank. The filter tank is arranged in the placement groove on the top surface of the support seat. An inspection port with a sealing cover is provided on the top surface of the filter tank. A liquid adding pipe is provided on one side of the inspection port. One end of the liquid adding pipe is connected to the filter tank. A drain pipe with a valve is also installed at the lower part of the side end surface of the filter tank. The filter tank is filled with filtered liquid.

[0008] An air inlet pipe is also provided on the top surface of the filter tank, and the air inlet end of the air inlet pipe is connected to the exhaust gas combustion emission pipe of the boiler through a suction pump, and the air outlet end extends to the bottom of the filter tank and is located below the liquid level of the filtrate, and a blowing assembly is installed on the air outlet end of the air inlet pipe, and the blowing assembly consists of two air blowing pipes, and a plurality of air blowing ports are equidistantly provided on the pipe body of the air blowing pipe, and a trumpet-shaped air nozzle is installed on the air outlet. An air outlet pipe is provided on one side of the air inlet pipe, one end of the air outlet pipe is connected to the inside of the filter tank, and a suction pump is installed on the other end.

[0009] The spray unit includes a spray tower and an alkali liquid tank. The spray tower is arranged on one side of the filter tank. A smoke inlet is opened at the lower part of the spray tower. The smoke inlet is connected to the exhaust pipe of the filter tank through a pipeline. The top is connected to a smoke exhaust pipe, and a drain pipe is installed at the bottom. A demister is arranged at the upper part of the spray tower, and the demister is connected to the inner wall of the spray tower through a mounting frame.

[0010] A spray assembly is provided below the demister in the spray tower, and the spray assembly includes a collecting hood, a spray main pipe and a spray branch pipe. The collecting hood is a hollow frustum structure with openings on the top and bottom surfaces. The diameter of the bottom surface of the collecting hood is 4 / 5 of the inner diameter of the spray tower, and it is connected to the middle and upper part of the spray tower through a mounting component. The number of the spray branch pipes is 2-4, and the spray branch pipes are provided with spray holes, and atomizing nozzles are installed on the spray holes. The spray branch pipes are equidistantly installed on the inner side wall of the collecting hood from top to bottom. One end of the spray main pipe is connected to each spray branch pipe, and the other end passes through the outside of the spray tower.

[0011] The alkali liquid tank is located on one side of the spray tower and is filled with alkali washing liquid. An alkali liquid filling port is provided on the top of the alkali liquid tank, and a liquid adding suction pipe is provided on one side of the alkali liquid filling port. One end of the alkali liquid suction pipe penetrates into the alkali liquid tank, and the distance between the port and the bottom of the alkali liquid tank is 10-20 cm. The other end is connected to the feed end of the spray main pipe of the spray tower through a suction pump.

[0012] The scrubbing unit includes a scrubbing tower, a circulating water tower and a water storage tower. An exhaust pipe is installed on the top of the scrubbing tower, a water inlet pipe is provided on the upper part, an air inlet is opened on the lower part, and a water outlet pipe is installed on the bottom. The drainage end of the water inlet pipe of the scrubbing tower is located in the scrubbing tower, and a scrubbing nozzle is installed on the port. A demister is installed above the scrubbing nozzle. The water inlet end is connected with the water outlet of the water storage tower through a pipeline and a water pump, and the water outlet end is connected with the drainage pipe of the circulating water tower, and the drainage pipe of the circulating water tower is arranged at its lower part. The water inlet of the water storage tower is connected with the drainage pipe of the circulating water tower through a pipeline and a water pump.

[0013] The purification unit includes a drying box and an adsorption box. Electric heating plates are respectively installed on the inner walls of the drying box. The air inlet pipe of the drying box is connected to the exhaust pipe of the intake tower. The adsorption box is arranged on one side of the drying box, and a detachable and replaceable activated carbon cotton board is installed therein. The air inlet pipe of the adsorption box is connected to the air outlet pipe of the drying box, and an air outlet pipe is installed on the side opposite to it.

[0014] Preferably, in order to improve the dissolution effect of solid alkaline compounds in the alkali solution, a stirring device is installed on the alkali solution tank, and the stirring device includes a stirring motor and a stirring shaft with blades. The stirring motor is installed on the side end face of the alkali solution tank through a mounting frame, and its transmission shaft penetrates into the alkali solution tank. The junction between the transmission shaft and the alkali solution tank is connected through a bearing sealing ring. The stirring shaft is located in the alkali solution tank and is connected to the transmission shaft of the stirring motor.

[0015] Preferably, the liquid level of the filtrate in the filter tank is 2 / 4-3 / 4 of the height inside the filter tank.

[0016] Preferably, the installation positions of each two adjacent spray branch pipes of the collecting cover are staggered.

[0017] Beneficial effects: The utility model can perform primary filtration, secondary spray desulfurization, tertiary scrubbing and quaternary purification on the flue gas after the combustion of yellow phosphorus tail gas by setting a filtration unit, a spray unit, a scrubbing unit and a purification unit in combination. The primary filtration can filter and adsorb particulate matter and some water-soluble substances mixed in the flue gas in the filtrate. The secondary spray desulfurization can fully absorb the acid gas and sulfide components in the flue gas through atomized alkaline solution. The tertiary scrubbing can dilute the trace sulfide and other substances remaining in the flue gas to reduce the harm to the environment. The quaternary purification can dry the flue gas and greatly reduce the harmful substances remaining in the flue gas through activated carbon adsorption. After the four-stage process, the exhausted flue gas will not cause pollution to the environment and can meet the emission requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model.

[0019] Figure 2 It is a structural schematic diagram of the filter unit in the utility model.

[0020] Figure 3 It is a structural schematic diagram of the spray unit in the utility model.

[0021] Figure 4 It is a structural schematic diagram of the gas washing unit in the utility model.

[0022] Figure 5 It is a structural schematic diagram of the purification unit in the utility model.

[0023] In the figure: 1. filter tank; 2. support base; 3. air blowing pipe; 4. trumpet-shaped air nozzle; 5. spray tower; 6. alkali solution tank; 7. demister; 8. collecting hood; 9. spray main pipe; 10. spray branch pipe; 11. atomizing nozzle; 12. air washing tower; 13. circulating water tower; 14. water storage tower; 15. air washing nozzle; 16. drying box; 17. adsorption box; 18. electric heating plate; 19. activated carbon cotton board; 20. stirring motor; 21. stirring shaft. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] The same parts are denoted by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. The drawings are all in a very simplified form and use inaccurate ratios, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model.

[0026] like Figure 1-5 As shown, this embodiment discloses a combustion flue gas treatment device for yellow phosphorus tail gas, which is installed in a yellow phosphorus plant to treat the flue gas generated after the combustion of yellow phosphorus tail gas. It specifically includes a filtering unit, a spraying unit, a washing unit and a purification unit. The electronic control components in each unit are connected and controlled by a control system in a workshop.

[0027] See also Figure 1 and Figure 2 The filter unit includes a filter tank 1 and a support base 2. Figure 2 The support seat 2 is composed of two support plates connected by support rods, one above and one below, and a placement groove matching the bottom shape of the filter tank 1 is provided on the top surface of the upper support seat 2. The filter tank 1 is arranged in the placement groove on the top surface of the support seat 2. An inspection port with a sealing cover is provided on the top surface of the filter tank 1. A liquid adding pipe is provided on one side of the inspection port. One end of the liquid adding pipe is connected to the filter tank 1. A drain pipe with a valve is also installed at the lower part of the side end surface of the filter tank 1. The filter tank 1 is filled with filtered liquid. The liquid level of the filtrate in the filter tank 1 is 3 / 4 of the height of the filter tank 1.

[0028] from Figure 2It can be seen that an air inlet pipe is also provided on the top surface of the filter tank 1, and the air inlet end of the air inlet pipe is connected to the exhaust gas combustion emission pipe of the boiler through a suction pump, and the air outlet end extends to the bottom of the filter tank 1 and is located below the liquid level of the filtrate, and a blowing assembly is installed on the air outlet end of the air inlet pipe, and the blowing assembly consists of two air blowing pipes 3, and a plurality of air blowing ports are equidistantly opened on the pipe body of the air blowing pipe 3, and a trumpet-shaped air nozzle 4 is installed on the air outlet. An air outlet pipe is provided on one side of the air inlet pipe, one end of the air outlet pipe is connected to the filter tank 1, and a suction pump is installed on the other end.

[0029] from Figure 1 and Figure 3 It can be seen that the spray unit includes a spray tower 5 and an alkali liquid tank 6. Figure 3 The spray tower 5 is arranged on one side of the filter tank 1, and a smoke inlet is opened at the lower part of the spray tower 5. The smoke inlet is connected to the exhaust pipe of the filter tank 1 through a pipeline, and the top is connected to a smoke exhaust pipe, and a liquid drain pipe is installed at the bottom. A demister 7 is provided in the upper part of the spray tower 5, and the demister 7 is connected to the inner wall of the spray tower 5 through a mounting frame.

[0030] For specific structure, see Figure 3 A spray assembly is provided in the spray tower 5, and the spray assembly includes a collecting hood 8, a spray main pipe 9 and a spray branch pipe 10. The collecting hood 8 is a hollow truncated cone structure with openings on the top and bottom surfaces. The diameter of the bottom surface of the collecting hood 8 is 4 / 5 of the inner diameter of the spray tower 5, and it is connected to the middle and upper part of the spray tower 5 through a mounting component. The number of the spray branch pipes 10 is 2-4, and spray holes are opened on the spray branch pipes 10. Atomizing nozzles 11 are installed on the spray holes. Each spray branch pipe 10 is equidistantly installed on the inner side wall of the collecting hood 8 from top to bottom. The installation positions of each adjacent two spray branch pipes 10 in the collecting hood 8 are staggered. One end of the spray main pipe 9 is connected to each spray branch pipe 10, and the other end passes through the outside of the spray tower 5.

[0031] See also Figure 1 , Figure 3 The alkali liquid tank 6 is located on one side of the spray tower 5 and is filled with alkali washing liquid. An alkali liquid filling port is provided on the top of the alkali liquid tank 6, and a liquid adding suction pipe is provided on one side of the alkali liquid filling port. One end of the alkali liquid suction pipe penetrates into the alkali liquid tank 6, and the distance between the port and the bottom of the alkali liquid tank 6 is 10-20 cm. The other end is connected to the feed end of the spray main pipe 9 of the spray tower 5 through a suction pump.

[0032] from Figure 3It can be seen that in order to improve the dissolution effect of solid alkaline compounds in the alkali solution, a stirring device is installed on the alkali solution tank 6, and the stirring device includes a stirring motor 20 and a stirring shaft 21 with blades. The stirring motor 20 is installed on the side end face of the alkali solution tank 6 through a mounting frame, and its transmission shaft penetrates into the alkali solution tank 6. The junction between the transmission shaft and the alkali solution tank 6 is connected through a bearing sealing ring. The stirring shaft 21 is located in the alkali solution tank 6, and is connected to the transmission shaft of the stirring motor 20.

[0033] See also Figure 1 and Figure 4 The scrubbing unit comprises a scrubbing tower 12, a circulating water tower 13 and a water storage tower 14. An exhaust pipe is installed on the top of the scrubbing tower 12, a water inlet pipe is provided on the upper part, an air inlet is opened on the lower part, and a water outlet pipe is installed on the bottom. The drainage end of the water inlet pipe of the scrubbing tower 12 is located in the scrubbing tower 12, and a scrubbing nozzle 15 is installed on the port. A demister 7 is installed above the scrubbing nozzle 15. The water inlet end is connected to the water outlet of the water storage tower 14 through a pipeline and a water pump, and the water outlet end is connected to the drainage pipe of the circulating water tower 13, and the drainage pipe of the circulating water tower 13 is arranged at its lower part. The water inlet of the water storage tower 14 is connected to the drainage pipe of the circulating water tower 13 through a pipeline and a water pump.

[0034] from Figure 1 and Figure 5 It can be seen that the purification unit includes a drying box 16 and an adsorption box 17. Figure 5 The inner wall of the drying box 16 is respectively installed with an electric heating plate 18, the air inlet pipe of the drying box 16 is connected with the exhaust pipe of the air intake tower, the adsorption box 17 is arranged on one side of the drying box 16, and a detachable and replaceable activated carbon cotton board 19 is installed therein, the air inlet pipe of the adsorption box 17 is connected with the air outlet pipe of the drying box 16, and an air outlet pipe is installed on the side opposite to it.

[0035] When using, see Figure 2 The flue gas generated by the combustion of yellow phosphorus tail gas is sucked into the filter tank 1 and blown out by the blowing pipe 3 and the trumpet-shaped air nozzle 4. The blown flue gas is fully in contact with the filtrate in the filter tank 1. The particulate matter and some water-soluble substances mixed in the flue gas are filtered and adsorbed in the filtrate. The flue gas after the initial filtration also contains some acidic substances and sulfides that are not easily dissolved in the filtrate. The flue gas continues to be transported forward into the spray tower 5.

[0036] from Figure 3It can be seen that when the flue gas enters the spray tower 5, the alkaline washing liquid is sucked from the alkaline liquid tank 6 into the spray tower 5 and sprayed by the atomizing nozzle 11 to form water mist, and the atomizing nozzle 11 is arranged in a multi-layer form, and the spraying amount of the spraying layer gradually decreases from bottom to top, which greatly enhances the spraying effect of the passing flue gas. The atomized alkaline liquid can fully mix and react the acidic gas and sulfide components in the flue gas, and the generated waste liquid is collected at the bottom of the tower. After the flue gas passes through the demister 7 for gas-liquid separation, it continues to be transported forward into the scrubbing tower 12.

[0037] See also Figure 4 When the flue gas enters the scrubbing tower 12, water is used to scrub the flue gas through the scrubbing nozzle 15 to dilute and flush the trace sulfide and other substances remaining in the flue gas, reducing the harm to the environment. The sewage after washing flows to the circulating water tower 13, and then enters the water storage tower 14 through the water pump, and the circulating water is reused. After the flue gas is separated into gas and liquid by the demister 7, it is continuously transported forward to the drying box 16.

[0038] See also Figure 5 The flue gas enters the drying box 16 for heating and dehumidification, and then is adsorbed by activated carbon to greatly reduce the harmful substances remaining in the flue gas. After being processed through the four-stage process, the exhausted flue gas will not cause pollution to the environment and can meet the emission requirements.

[0039] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A combustion flue gas treatment device for yellow phosphorus tail gas, comprising a filtering unit, a spraying unit, a scrubbing unit and a purification unit, wherein the electric control components in each unit are connected and controlled by a control system in a workshop; characterized in that: The filter unit comprises a filter tank (1) and a support seat (2), wherein the support seat (2) is composed of two support plates, one upper and one lower, connected by a support rod, and the top surface of the upper support seat (2) is provided with a placement groove that matches the shape of the bottom surface of the filter tank (1), and the filter tank (1) is arranged in the placement groove on the top surface of the support seat (2), and an inspection port with a sealing cover is provided on the top surface of the filter tank (1), and a liquid adding pipe is provided on one side of the inspection port, and one end of the liquid adding pipe is connected to the filter tank (1), and a discharge pipe with a valve is also installed at the lower part of the side end surface of the filter tank (1), and the filter tank (1) is filled with filtered liquid; An air inlet pipe is also provided on the top surface of the filter tank (1), the air inlet end of the air inlet pipe is connected to the exhaust gas combustion discharge pipe of the boiler through a suction pump, the air outlet end extends to the bottom of the filter tank (1) and is located below the liquid surface of the filtrate, and a blowing assembly is installed on the air outlet end of the air inlet pipe, the blowing assembly is composed of two air blowing pipes (3), a plurality of air blowing ports are equidistantly provided on the pipe body of the air blowing pipe (3), and a trumpet-shaped air nozzle (4) is installed on the air blowing port, and an air outlet pipe is provided on one side of the air inlet pipe, one end of the air outlet pipe is connected to the inside of the filter tank (1), and the other end is installed with a suction pump; The spray unit comprises a spray tower (5) and an alkali liquid tank (6), the spray tower (5) being arranged on one side of the filter tank (1), a smoke inlet being provided at the lower part of the spray tower (5), the smoke inlet being connected to the exhaust pipe of the filter tank (1) through a pipeline, a smoke exhaust pipe being connected to the top, and a liquid discharge pipe being installed at the bottom, a demister (7) being provided at the upper part of the spray tower (5), the demister (7) being connected to the inner wall of the spray tower (5) through a mounting frame; A spray assembly is provided below the demister (7) in the spray tower (5), and the spray assembly comprises a collecting hood (8), a spray main pipe (9) and a spray branch pipe (10). The collecting hood (8) is a hollow truncated cone structure with openings on the top and bottom surfaces. The diameter of the bottom surface of the collecting hood (8) is 4 / 5 of the inner diameter of the spray tower (5). The collecting hood (8) is connected to the middle and upper part of the spray tower (5) through a mounting component. The number of the spray branch pipes (10) is 2-4. The spray branch pipes (10) are provided with spray holes, and atomizing nozzles (11) are installed on the spray holes. The spray branch pipes (10) are equidistantly installed on the inner side wall of the collecting hood (8) from top to bottom. One end of the spray main pipe (9) is connected to each spray branch pipe (10), and the other end passes through the outside of the spray tower (5); The alkali liquid tank (6) is located on one side of the spray tower (5), and contains alkali washing liquid. An alkali liquid filling port is provided on the top of the alkali liquid tank (6), and a liquid adding suction pipe is provided on one side of the alkali liquid filling port. One end of the alkali liquid suction pipe penetrates into the alkali liquid tank (6), and the distance between the end of the alkali liquid suction pipe and the bottom of the alkali liquid tank (6) is 10-20 cm. The other end of the alkali liquid suction pipe is connected to the feed end of the spray main pipe (9) of the spray tower (5) through a suction pump. The scrubbing unit comprises a scrubbing tower (12), a circulating water tower (13) and a water storage tower (14); an exhaust pipe is installed on the top of the scrubbing tower (12); a water inlet pipe is provided on the upper part; an air inlet is provided on the lower part; and a water outlet is installed on the bottom; a drainage end of the water inlet pipe of the scrubbing tower (12) is located inside the scrubbing tower (12); and a scrubbing nozzle (15) is installed on the port; a demister (7) is installed above the scrubbing nozzle (15); the water inlet end is connected to the water outlet of the water storage tower (14) through a pipeline and a water pump; the water outlet end is connected to the drainage pipe of the circulating water tower (13); the drainage pipe of the circulating water tower (13) is arranged at its lower part; and the water inlet of the water storage tower (14) is connected to the drainage pipe of the circulating water tower (13) through a pipeline and a water pump; The purification unit comprises a drying box (16) and an adsorption box (17), the inner side walls of the drying box (16) are respectively provided with electric heating plates (18), the air inlet pipe of the drying box (16) is connected to the exhaust pipe of the air intake tower, the adsorption box (17) is arranged on one side of the drying box (16), and a detachable and replaceable activated carbon cotton board (19) is installed therein, the air inlet pipe of the adsorption box (17) is connected to the air outlet pipe of the drying box (16), and an air outlet pipe is installed on the side surface opposite to the air inlet pipe.

2. The combustion flue gas treatment device for yellow phosphorus tail gas according to claim 1, characterized in that: The alkali liquid tank (6) is provided with a stirring device, the stirring device comprising a stirring motor (20) and a stirring shaft (21) with blades. The stirring motor (20) is mounted on a side end surface of the alkali liquid tank (6) via a mounting frame, and its transmission shaft penetrates into the alkali liquid tank (6). The connection between the transmission shaft and the alkali liquid tank (6) is connected via a bearing sealing ring. The stirring shaft (21) is located in the alkali liquid tank (6) and is connected to the transmission shaft of the stirring motor (20).

3. A yellow phosphorus tail gas combustion flue gas treatment device according to claim 1 or 2, characterized in that: The liquid level of the filtrate in the filter tank (1) is 2 / 4 to 3 / 4 of the height of the filter tank (1).

4. A yellow phosphorus tail gas combustion flue gas treatment device according to claim 1 or 2, characterized in that: The installation positions of each two adjacent spray branch pipes (10) of the collecting cover (8) are staggered with each other.

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